/* * scst_lib.c * * Copyright (C) 2004 - 2017 Vladislav Bolkhovitin * Copyright (C) 2004 - 2005 Leonid Stoljar * Copyright (C) 2007 - 2017 SanDisk Corporation * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, version 2 * of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef INSIDE_KERNEL_TREE #include #endif #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27) #include #endif #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) #include #endif #include #include #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29) #include #endif #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0) #include #endif #ifdef INSIDE_KERNEL_TREE #include #else #include "scst.h" #endif #include "scst_priv.h" #include "scst_mem.h" #include "scst_pres.h" /* * List and IRQ lock to globally serialize all STPG commands. Needed to * prevent deadlock, if (1) a device group contains multiple devices and * (2) STPG commands comes to 2 or more of them at about the same time. * In this case they will be waiting for each other to finish all pending * commands, i.e. the STPG commands waiting for each other. Strict * serialization is per device, so can not help here. * * ToDo: make it per device group. */ static DEFINE_SPINLOCK(scst_global_stpg_list_lock); static LIST_HEAD(scst_global_stpg_list); #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) static void scst_put_acg_work(void *p); #else static void scst_put_acg_work(struct work_struct *work); #endif static void scst_free_acn(struct scst_acn *acn, bool reassign); #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) struct scsi_io_context { void *data; void (*done)(void *data, char *sense, int result, int resid); char sense[SCST_SENSE_BUFFERSIZE]; }; static struct kmem_cache *scsi_io_context_cache; #endif static struct workqueue_struct *scst_release_acg_wq; #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) \ && (!defined(RHEL_RELEASE_CODE) || RHEL_RELEASE_CODE -0 < 5 * 256 + 3) \ && !defined(CONFIG_PPC) static int strncasecmp(const char *s1, const char *s2, size_t n) { int c1, c2; do { c1 = tolower(*s1++); c2 = tolower(*s2++); } while ((--n > 0) && c1 == c2 && c1 != 0); return c1 - c2; } #endif #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap) { unsigned int len; char *p; va_list aq; va_copy(aq, ap); len = vsnprintf(NULL, 0, fmt, aq); va_end(aq); p = kmalloc_track_caller(len + 1, gfp); if (!p) return NULL; vsnprintf(p, len + 1, fmt, ap); return p; } #endif #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35) && \ (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 6 || \ RHEL_MAJOR -0 == 6 && RHEL_MINOR -0 < 1) /* * See also "lib: introduce common method to convert hex digits" (commit * 903788892ea0fc7fcaf7e8e5fac9a77379fc215b). */ int hex_to_bin(char ch) { if (ch >= '0' && ch <= '9') return ch - '0'; ch = tolower(ch); if (ch >= 'a' && ch <= 'f') return ch - 'a' + 10; return -1; } EXPORT_SYMBOL(hex_to_bin); #endif #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30) || \ !defined(SCSI_EXEC_REQ_FIFO_DEFINED) static int sg_copy(struct scatterlist *dst_sg, struct scatterlist *src_sg, #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) int nents_to_copy, size_t copy_len, enum km_type d_km_type, enum km_type s_km_type); #else int nents_to_copy, size_t copy_len); #endif #endif static void scst_free_descriptors(struct scst_cmd *cmd); static bool sg_cmp(struct scatterlist *dst_sg, struct scatterlist *src_sg, int nents_to_cmp, size_t cmp_len, int *miscompare_offs #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) , enum km_type d_km_type, enum km_type s_km_type #endif ); const struct scst_opcode_descriptor scst_op_descr_inquiry = { .od_opcode = INQUIRY, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 6, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { INQUIRY, 1, 0xFF, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_inquiry); const struct scst_opcode_descriptor scst_op_descr_extended_copy = { .od_opcode = EXTENDED_COPY, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 16, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_REG_TIMEOUT/HZ, .od_cdb_usage_bits = { EXTENDED_COPY, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0xFF, 0xFF, 0, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_extended_copy); const struct scst_opcode_descriptor scst_op_descr_tur = { .od_opcode = TEST_UNIT_READY, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 6, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { TEST_UNIT_READY, 0, 0, 0, 0, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_tur); const struct scst_opcode_descriptor scst_op_descr_log_select = { .od_opcode = LOG_SELECT, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 10, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { LOG_SELECT, 3, 0xFF, 0xFF, 0, 0, 0, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_log_select); const struct scst_opcode_descriptor scst_op_descr_log_sense = { .od_opcode = LOG_SENSE, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 10, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { LOG_SENSE, 1, 0xFF, 0xFF, 0, 0xFF, 0xFF, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_log_sense); const struct scst_opcode_descriptor scst_op_descr_mode_select6 = { .od_opcode = MODE_SELECT, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 6, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { MODE_SELECT, 0x11, 0, 0, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_mode_select6); const struct scst_opcode_descriptor scst_op_descr_mode_sense6 = { .od_opcode = MODE_SENSE, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 6, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { MODE_SENSE, 8, 0xFF, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_mode_sense6); const struct scst_opcode_descriptor scst_op_descr_mode_select10 = { .od_opcode = MODE_SELECT_10, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 10, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { MODE_SELECT_10, 0x11, 0, 0, 0, 0, 0, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_mode_select10); const struct scst_opcode_descriptor scst_op_descr_mode_sense10 = { .od_opcode = MODE_SENSE_10, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 10, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { MODE_SENSE_10, 0x18, 0xFF, 0xFF, 0, 0, 0, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_mode_sense10); const struct scst_opcode_descriptor scst_op_descr_rtpg = { .od_opcode = MAINTENANCE_IN, .od_serv_action = MI_REPORT_TARGET_PGS, .od_serv_action_valid = 1, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 12, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { MAINTENANCE_IN, 0xE0|MI_REPORT_TARGET_PGS, 0, 0, 0, 0, 0xFF, 0xFF, 0xFF, 0xFF, 0, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_rtpg); const struct scst_opcode_descriptor scst_op_descr_stpg = { .od_opcode = MAINTENANCE_OUT, .od_serv_action = MO_SET_TARGET_PGS, .od_serv_action_valid = 1, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 12, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { MAINTENANCE_OUT, MO_SET_TARGET_PGS, 0, 0, 0, 0, 0xFF, 0xFF, 0xFF, 0xFF, 0, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_stpg); const struct scst_opcode_descriptor scst_op_descr_send_diagnostic = { .od_opcode = SEND_DIAGNOSTIC, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 6, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { SEND_DIAGNOSTIC, 0xF7, 0, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_send_diagnostic); const struct scst_opcode_descriptor scst_op_descr_reserve6 = { .od_opcode = RESERVE, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 6, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { RESERVE, 0, 0, 0, 0, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_reserve6); const struct scst_opcode_descriptor scst_op_descr_release6 = { .od_opcode = RELEASE, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 6, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { RELEASE, 0, 0, 0, 0, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_release6); const struct scst_opcode_descriptor scst_op_descr_reserve10 = { .od_opcode = RESERVE_10, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 10, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { RESERVE_10, 0, 0, 0, 0, 0, 0, 0, 0, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_reserve10); const struct scst_opcode_descriptor scst_op_descr_release10 = { .od_opcode = RELEASE_10, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 10, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { RELEASE_10, 0, 0, 0, 0, 0, 0, 0, 0, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_release10); const struct scst_opcode_descriptor scst_op_descr_pr_in = { .od_opcode = PERSISTENT_RESERVE_IN, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 10, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { PERSISTENT_RESERVE_IN, 0x1F, 0, 0, 0, 0, 0, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_pr_in); const struct scst_opcode_descriptor scst_op_descr_pr_out = { .od_opcode = PERSISTENT_RESERVE_OUT, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 10, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { PERSISTENT_RESERVE_OUT, 0x1F, 0xFF, 0, 0, 0xFF, 0xFF, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_pr_out); const struct scst_opcode_descriptor scst_op_descr_report_luns = { .od_opcode = REPORT_LUNS, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 12, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { REPORT_LUNS, 0, 0xFF, 0, 0, 0, 0xFF, 0xFF, 0xFF, 0xFF, 0, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_report_luns); const struct scst_opcode_descriptor scst_op_descr_request_sense = { .od_opcode = REQUEST_SENSE, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 6, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { REQUEST_SENSE, 1, 0, 0, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_request_sense); const struct scst_opcode_descriptor scst_op_descr_report_supp_tm_fns = { .od_opcode = MAINTENANCE_IN, .od_serv_action = MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS, .od_serv_action_valid = 1, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 12, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { MAINTENANCE_IN, MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS, 0x80, 0, 0, 0, 0xFF, 0xFF, 0xFF, 0xFF, 0, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_report_supp_tm_fns); const struct scst_opcode_descriptor scst_op_descr_report_supp_opcodes = { .od_opcode = MAINTENANCE_IN, .od_serv_action = MI_REPORT_SUPPORTED_OPERATION_CODES, .od_serv_action_valid = 1, .od_support = 3, /* supported as in the standard */ .od_cdb_size = 12, .od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC, .od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ, .od_cdb_usage_bits = { MAINTENANCE_IN, MI_REPORT_SUPPORTED_OPERATION_CODES, 0x87, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0, SCST_OD_DEFAULT_CONTROL_BYTE }, }; EXPORT_SYMBOL(scst_op_descr_report_supp_opcodes); struct scst_sdbops; static int get_cdb_info_len_10(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_block_limit(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_read_capacity(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_serv_act_in(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_single(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_read_pos(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_prevent_allow_medium_removal(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_start_stop(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_len_3_read_elem_stat(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_len_2(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_fmt(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_verify6(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_verify10(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_verify12(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_verify16(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_len_1(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_lba_3_len_1_256_read(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_lba_3_len_1_256_write(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_bidi_lba_4_len_2(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_len_3(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_len_4(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_none(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_lba_2_none(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_lba_4_len_2(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_read_10(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_lba_4_len_2_wrprotect(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_lba_4_none(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_lba_4_len_4_rdprotect(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_lba_4_len_4_wrprotect(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_read_16(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_lba_8_len_4_wrprotect(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_lba_8_none(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_write_same10(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_write_same16(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_compare_and_write(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_ext_copy(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_apt(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_min(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_mo(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); static int get_cdb_info_var_len(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); /* * +=====================================-============-======- * | Command name | Operation | Type | * | | code | | * |-------------------------------------+------------+------+ * * +=========================================================+ * |Key: M = command implementation is mandatory. | * | O = command implementation is optional. | * | V = Vendor-specific | * | R = Reserved | * | ' '= DON'T use for this device | * +=========================================================+ */ #define SCST_CDB_MANDATORY 'M' /* mandatory */ #define SCST_CDB_OPTIONAL 'O' /* optional */ #define SCST_CDB_VENDOR 'V' /* vendor */ #define SCST_CDB_RESERVED 'R' /* reserved */ #define SCST_CDB_NOTSUPP ' ' /* don't use */ struct scst_sdbops { uint8_t ops; /* SCSI-2 op codes */ uint8_t devkey[16]; /* Key for every device type M,O,V,R * type_disk devkey[0] * type_tape devkey[1] * type_printer devkey[2] * type_processor devkey[3] * type_worm devkey[4] * type_cdrom devkey[5] * type_scanner devkey[6] * type_mod devkey[7] * type_changer devkey[8] * type_commdev devkey[9] * type_reserv devkey[A] * type_reserv devkey[B] * type_raid devkey[C] * type_enclosure devkey[D] * type_reserv devkey[E] * type_reserv devkey[F] */ uint8_t info_lba_off; /* LBA offset in cdb */ uint8_t info_lba_len; /* LBA length in cdb */ uint8_t info_len_off; /* length offset in cdb */ uint8_t info_len_len; /* length length in cdb */ uint8_t info_data_direction; /* * init --> target: SCST_DATA_WRITE * target --> init: SCST_DATA_READ * target <--> init: SCST_DATA_READ| * SCST_DATA_WRITE */ uint32_t info_op_flags; /* various flags of this opcode */ const char *info_op_name;/* op code SCSI full name */ int (*get_cdb_info)(struct scst_cmd *cmd, const struct scst_sdbops *sdbops); }; static int scst_scsi_op_list[256]; #define FLAG_NONE 0 /* See also http://www.t10.org/lists/op-num.htm */ static const struct scst_sdbops scst_scsi_op_table[] = { /* * +-------------------> TYPE_DISK (0) * | * |+------------------> TYPE_TAPE (1) * || * ||+-----------------> TYPE_PRINTER (2) * ||| * |||+----------------> TYPE_PROCESSOR (3) * |||| * ||||+---------------> TYPE_WORM (4) * ||||| * |||||+--------------> TYPE_CDROM (5) * |||||| * ||||||+-------------> TYPE_SCANNER (6) * ||||||| * |||||||+------------> TYPE_MOD (7) * |||||||| * ||||||||+-----------> TYPE_CHANGER (8) * ||||||||| * |||||||||+----------> TYPE_COMM (9) * |||||||||| * |||||||||| +-------> TYPE_RAID (C) * |||||||||| | * |||||||||| |+------> TYPE_ENCLOSURE (D) * |||||||||| || * |||||||||| ||+-----> TYPE_RBC (E) * |||||||||| ||| * |||||||||| |||+----> Optical card (F) * |||||||||| |||| * |||||||||| |||| * 0123456789ABCDEF -> TYPE_???? */ /* 6-bytes length CDB */ {.ops = 0x00, .devkey = "MMMMMMMMMMMMMMMM", .info_op_name = "TEST UNIT READY", .info_data_direction = SCST_DATA_NONE, /* Let's be HQ to don't look dead under high load */ .info_op_flags = SCST_SMALL_TIMEOUT|SCST_IMPLICIT_HQ| SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED| #ifdef CONFIG_SCST_TEST_IO_IN_SIRQ SCST_TEST_IO_IN_SIRQ_ALLOWED| #endif SCST_EXCL_ACCESS_ALLOWED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x01, .devkey = " M ", .info_op_name = "REWIND", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_EXCL_ALLOWED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x03, .devkey = "MMMMMMMMMMMMMMMM", .info_op_name = "REQUEST SENSE", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_SKIP_UA|SCST_LOCAL_CMD| SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED| SCST_EXCL_ACCESS_ALLOWED, .info_len_off = 4, .info_len_len = 1, .get_cdb_info = get_cdb_info_len_1}, {.ops = 0x04, .devkey = "M O O ", .info_op_name = "FORMAT UNIT", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM|SCST_STRICTLY_SERIALIZED, .get_cdb_info = get_cdb_info_fmt}, {.ops = 0x04, .devkey = " O ", .info_op_name = "FORMAT MEDIUM", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM|SCST_STRICTLY_SERIALIZED, .info_len_off = 3, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x04, .devkey = " O ", .info_op_name = "FORMAT", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_WRITE_MEDIUM|SCST_STRICTLY_SERIALIZED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x05, .devkey = "VMVVVV V ", .info_op_name = "READ BLOCK LIMITS", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_REG_RESERVE_ALLOWED| SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED, .get_cdb_info = get_cdb_info_block_limit}, {.ops = 0x07, .devkey = " O ", .info_op_name = "INITIALIZE ELEMENT STATUS", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_none}, {.ops = 0x07, .devkey = "OVV O OV ", .info_op_name = "REASSIGN BLOCKS", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_WRITE_MEDIUM, .get_cdb_info = get_cdb_info_none}, {.ops = 0x08, .devkey = "O ", .info_op_name = "READ(6)", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| #ifdef CONFIG_SCST_TEST_IO_IN_SIRQ SCST_TEST_IO_IN_SIRQ_ALLOWED| #endif SCST_WRITE_EXCL_ALLOWED, .info_lba_off = 1, .info_lba_len = 3, .info_len_off = 4, .info_len_len = 1, .get_cdb_info = get_cdb_info_lba_3_len_1_256_read}, {.ops = 0x08, .devkey = " MV O OV ", .info_op_name = "READ(6)", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| SCST_WRITE_EXCL_ALLOWED, .info_len_off = 2, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x08, .devkey = " M ", .info_op_name = "GET MESSAGE(6)", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 2, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x08, .devkey = " O ", .info_op_name = "RECEIVE", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 2, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x0A, .devkey = "O ", .info_op_name = "WRITE(6)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| #ifdef CONFIG_SCST_TEST_IO_IN_SIRQ SCST_TEST_IO_IN_SIRQ_ALLOWED| #endif SCST_WRITE_MEDIUM, .info_lba_off = 1, .info_lba_len = 3, .info_len_off = 4, .info_len_len = 1, .get_cdb_info = get_cdb_info_lba_3_len_1_256_write}, {.ops = 0x0A, .devkey = " M O OV ", .info_op_name = "WRITE(6)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM, .info_len_off = 2, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x0A, .devkey = " M ", .info_op_name = "PRINT", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x0A, .devkey = " M ", .info_op_name = "SEND MESSAGE(6)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 2, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x0A, .devkey = " M ", .info_op_name = "SEND(6)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 2, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x0B, .devkey = "O OO OV ", .info_op_name = "SEEK(6)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .info_lba_off = 2, .info_lba_len = 2, .get_cdb_info = get_cdb_info_lba_2_none}, {.ops = 0x0B, .devkey = " O ", .info_op_name = "SLEW AND PRINT", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x0C, .devkey = " VVVVV V ", .info_op_name = "SEEK BLOCK", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_none}, {.ops = 0x0D, .devkey = " VVVVV V ", .info_op_name = "PARTITION", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM, .get_cdb_info = get_cdb_info_none}, {.ops = 0x0F, .devkey = " OVVVV V ", .info_op_name = "READ REVERSE", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| SCST_WRITE_EXCL_ALLOWED, .info_len_off = 12, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x10, .devkey = " M V V ", .info_op_name = "WRITE FILEMARKS(6)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_WRITE_MEDIUM, .get_cdb_info = get_cdb_info_none}, {.ops = 0x10, .devkey = " O O ", .info_op_name = "SYNCHRONIZE BUFFER", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x11, .devkey = "VMVVVV ", .info_op_name = "SPACE", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT| SCST_WRITE_EXCL_ALLOWED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x12, .devkey = "MMMMMMMMMMMMMMMM", .info_op_name = "INQUIRY", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_IMPLICIT_HQ|SCST_SKIP_UA| SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED| SCST_EXCL_ACCESS_ALLOWED, .info_len_off = 3, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x13, .devkey = " O ", .info_op_name = "VERIFY(6)", .info_data_direction = SCST_DATA_UNKNOWN, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED, .info_len_off = 2, .info_len_len = 3, .get_cdb_info = get_cdb_info_verify6}, {.ops = 0x14, .devkey = " OOVVV ", .info_op_name = "RECOVER BUFFERED DATA", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED, .info_len_off = 2, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x15, .devkey = "OMOOOOOOOOOOOOOO", .info_op_name = "MODE SELECT(6)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_STRICTLY_SERIALIZED, .info_len_off = 4, .info_len_len = 1, .get_cdb_info = get_cdb_info_len_1}, {.ops = 0x16, .devkey = "MMMMMMMMMMMMMMMM", .info_op_name = "RESERVE", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED| SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED| SCST_SCSI_ATOMIC/* see comment in scst_cmd_overlap() */, .get_cdb_info = get_cdb_info_none}, {.ops = 0x17, .devkey = "MMMMMMMMMMMMMMMM", .info_op_name = "RELEASE", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED| SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED| SCST_EXCL_ACCESS_ALLOWED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x19, .devkey = " MVVVV ", .info_op_name = "ERASE", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM, .get_cdb_info = get_cdb_info_none}, {.ops = 0x1A, .devkey = "OMOOOOOOOOOOOOOO", .info_op_name = "MODE SENSE(6)", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_SMALL_TIMEOUT | SCST_WRITE_EXCL_ALLOWED, .info_len_off = 4, .info_len_len = 1, .get_cdb_info = get_cdb_info_len_1}, {.ops = 0x1B, .devkey = " O ", .info_op_name = "SCAN", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x1B, .devkey = " O ", .info_op_name = "LOAD UNLOAD", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_none}, {.ops = 0x1B, .devkey = " O ", .info_op_name = "STOP PRINT", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x1B, .devkey = "O OO O O ", .info_op_name = "START STOP UNIT", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_start_stop}, {.ops = 0x1C, .devkey = "OOOOOOOOOOOOOOOO", .info_op_name = "RECEIVE DIAGNOSTIC RESULTS", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_WRITE_EXCL_ALLOWED, .info_len_off = 3, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x1D, .devkey = "MMMMMMMMMMMMMMMM", .info_op_name = "SEND DIAGNOSTIC", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 3, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x1E, .devkey = "OOOOOOOOOOOOOOOO", .info_op_name = "PREVENT ALLOW MEDIUM REMOVAL", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_prevent_allow_medium_removal}, {.ops = 0x1F, .devkey = " O ", .info_op_name = "PORT STATUS", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, /* 10-bytes length CDB */ {.ops = 0x23, .devkey = "V VV V ", .info_op_name = "READ FORMAT CAPACITY", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x24, .devkey = " VVM ", .info_op_name = "SET WINDOW", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x25, .devkey = "M MM M ", .info_op_name = "READ CAPACITY", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_IMPLICIT_HQ|SCST_REG_RESERVE_ALLOWED| SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED, .get_cdb_info = get_cdb_info_read_capacity}, {.ops = 0x25, .devkey = " O ", .info_op_name = "GET WINDOW", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x28, .devkey = "M MMMM ", .info_op_name = "READ(10)", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| #ifdef CONFIG_SCST_TEST_IO_IN_SIRQ SCST_TEST_IO_IN_SIRQ_ALLOWED| #endif SCST_WRITE_EXCL_ALLOWED, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_read_10}, {.ops = 0x28, .devkey = " O ", .info_op_name = "GET MESSAGE(10)", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x29, .devkey = "V VV O ", .info_op_name = "READ GENERATION", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 8, .info_len_len = 1, .get_cdb_info = get_cdb_info_len_1}, {.ops = 0x2A, .devkey = "O MO M ", .info_op_name = "WRITE(10)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| #ifdef CONFIG_SCST_TEST_IO_IN_SIRQ SCST_TEST_IO_IN_SIRQ_ALLOWED| #endif SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_lba_4_len_2_wrprotect}, {.ops = 0x2A, .devkey = " O ", .info_op_name = "SEND MESSAGE(10)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x2A, .devkey = " O ", .info_op_name = "SEND(10)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x2B, .devkey = " O ", .info_op_name = "LOCATE", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_EXCL_ALLOWED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x2B, .devkey = " O ", .info_op_name = "POSITION TO ELEMENT", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_none}, {.ops = 0x2B, .devkey = "O OO O ", .info_op_name = "SEEK(10)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .info_lba_off = 2, .info_lba_len = 4, .get_cdb_info = get_cdb_info_lba_4_none}, {.ops = 0x2C, .devkey = "V O O ", .info_op_name = "ERASE(10)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM, .get_cdb_info = get_cdb_info_none}, {.ops = 0x2D, .devkey = "V O O ", .info_op_name = "READ UPDATED BLOCK", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED, .get_cdb_info = get_cdb_info_single}, {.ops = 0x2E, .devkey = "O OO O ", .info_op_name = "WRITE AND VERIFY(10)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_lba_4_len_2_wrprotect}, {.ops = 0x2F, .devkey = "O OO O ", .info_op_name = "VERIFY(10)", .info_data_direction = SCST_DATA_UNKNOWN, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_verify10}, {.ops = 0x33, .devkey = " OO O ", .info_op_name = "SET LIMITS(10)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x34, .devkey = " O ", .info_op_name = "READ POSITION", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_WRITE_EXCL_ALLOWED, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_read_pos}, {.ops = 0x34, .devkey = " O ", .info_op_name = "GET DATA BUFFER STATUS", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x34, .devkey = "O OO O ", .info_op_name = "PRE-FETCH", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_WRITE_EXCL_ALLOWED, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_lba_4_none}, {.ops = 0x35, .devkey = "O OO O ", .info_op_name = "SYNCHRONIZE CACHE(10)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_lba_4_none}, {.ops = 0x36, .devkey = "O OO O ", .info_op_name = "LOCK UNLOCK CACHE", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_WRITE_EXCL_ALLOWED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x37, .devkey = "O O ", .info_op_name = "READ DEFECT DATA(10)", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_WRITE_EXCL_ALLOWED, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x37, .devkey = " O ", .info_op_name = "INIT ELEMENT STATUS WRANGE", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_none}, {.ops = 0x38, .devkey = " O O ", .info_op_name = "MEDIUM SCAN", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 8, .info_len_len = 1, .get_cdb_info = get_cdb_info_len_1}, {.ops = 0x3B, .devkey = "OOOOOOOOOOOOOOOO", .info_op_name = "WRITE BUFFER", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_SMALL_TIMEOUT, .info_len_off = 6, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x3C, .devkey = "OOOOOOOOOOOOOOOO", .info_op_name = "READ BUFFER", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_SMALL_TIMEOUT | SCST_WRITE_EXCL_ALLOWED, .info_len_off = 6, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x3D, .devkey = " O O ", .info_op_name = "UPDATE BLOCK", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED, .get_cdb_info = get_cdb_info_single}, {.ops = 0x3E, .devkey = "O OO O ", .info_op_name = "READ LONG", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_lba_4_len_2}, {.ops = 0x3F, .devkey = "O O O ", .info_op_name = "WRITE LONG", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_lba_4_len_2}, {.ops = 0x40, .devkey = "OOOOOOOOOO ", .info_op_name = "CHANGE DEFINITION", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_SMALL_TIMEOUT, .info_len_off = 8, .info_len_len = 1, .get_cdb_info = get_cdb_info_len_1}, {.ops = 0x41, .devkey = "O ", .info_op_name = "WRITE SAME(10)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_write_same10}, {.ops = 0x42, .devkey = " O ", .info_op_name = "READ SUB-CHANNEL", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x42, .devkey = "O ", .info_op_name = "UNMAP", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_WRITE_MEDIUM|SCST_DESCRIPTORS_BASED, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x43, .devkey = " O ", .info_op_name = "READ TOC/PMA/ATIP", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x44, .devkey = " M ", .info_op_name = "REPORT DENSITY SUPPORT", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED| SCST_EXCL_ACCESS_ALLOWED, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x44, .devkey = " O ", .info_op_name = "READ HEADER", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x45, .devkey = " O ", .info_op_name = "PLAY AUDIO(10)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x46, .devkey = " O ", .info_op_name = "GET CONFIGURATION", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x47, .devkey = " O ", .info_op_name = "PLAY AUDIO MSF", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x48, .devkey = " O ", .info_op_name = "PLAY AUDIO TRACK INDEX", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x49, .devkey = " O ", .info_op_name = "PLAY TRACK RELATIVE(10)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x4A, .devkey = " O ", .info_op_name = "GET EVENT STATUS NOTIFICATION", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x4B, .devkey = " O ", .info_op_name = "PAUSE/RESUME", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x4C, .devkey = "OOOOOOOOOOOOOOOO", .info_op_name = "LOG SELECT", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_STRICTLY_SERIALIZED, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x4D, .devkey = "OOOOOOOOOOOOOOOO", .info_op_name = "LOG SENSE", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_REG_RESERVE_ALLOWED| SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x4E, .devkey = " O ", .info_op_name = "STOP PLAY/SCAN", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x50, .devkey = "O ", .info_op_name = "XDWRITE(10)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_lba_4_len_2_wrprotect}, {.ops = 0x51, .devkey = " O ", .info_op_name = "READ DISC INFORMATION", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x51, .devkey = "O ", .info_op_name = "XPWRITE", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_lba_4_len_2}, {.ops = 0x52, .devkey = " O ", .info_op_name = "READ TRACK INFORMATION", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x53, .devkey = "O ", .info_op_name = "XDWRITEREAD(10)", .info_data_direction = SCST_DATA_BIDI, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_bidi_lba_4_len_2}, {.ops = 0x53, .devkey = " O ", .info_op_name = "RESERVE TRACK", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x54, .devkey = " O ", .info_op_name = "SEND OPC INFORMATION", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x55, .devkey = "OOOOOOOOOOOOOOOO", .info_op_name = "MODE SELECT(10)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_STRICTLY_SERIALIZED, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x56, .devkey = "OOOOOOOOOOOOOOOO", .info_op_name = "RESERVE(10)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED| SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED| SCST_SCSI_ATOMIC/* see comment in scst_cmd_overlap() */, .get_cdb_info = get_cdb_info_none}, {.ops = 0x57, .devkey = "OOOOOOOOOOOOOOOO", .info_op_name = "RELEASE(10)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED| SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED| SCST_EXCL_ACCESS_ALLOWED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x58, .devkey = " O ", .info_op_name = "REPAIR TRACK", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_WRITE_MEDIUM, .get_cdb_info = get_cdb_info_none}, {.ops = 0x5A, .devkey = "OOOOOOOOOOOOOOOO", .info_op_name = "MODE SENSE(10)", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_SMALL_TIMEOUT | SCST_WRITE_EXCL_ALLOWED, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x5B, .devkey = " O ", .info_op_name = "CLOSE TRACK/SESSION", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x5C, .devkey = " O ", .info_op_name = "READ BUFFER CAPACITY", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0x5D, .devkey = " O ", .info_op_name = "SEND CUE SHEET", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0x5E, .devkey = "OOOOO OOOO ", .info_op_name = "PERSISTENT RESERVE IN", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED| SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED, .info_len_off = 5, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0x5F, .devkey = "OOOOO OOOO ", .info_op_name = "PERSISTENT RESERVE OUT", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED| SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED, .info_len_off = 5, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, /* Variable length CDBs */ {.ops = 0x7F, .devkey = "O ", .info_op_name = "VAR LEN CDB", .info_data_direction = SCST_DATA_UNKNOWN, .info_op_flags = 0, .get_cdb_info = get_cdb_info_var_len}, /* 16-bytes length CDB */ {.ops = 0x80, .devkey = " O ", .info_op_name = "WRITE FILEMARKS(16)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_WRITE_MEDIUM, .get_cdb_info = get_cdb_info_none}, {.ops = 0x81, .devkey = "O OO O ", .info_op_name = "REBUILD", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_WRITE_MEDIUM, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0x82, .devkey = "O OO O ", .info_op_name = "REGENERATE", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_WRITE_MEDIUM, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0x83, .devkey = "O ", /* implemented only for disks */ .info_op_name = "EXTENDED COPY", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_WRITE_MEDIUM|SCST_CAN_GEN_3PARTY_COMMANDS| SCST_LOCAL_CMD|SCST_DESCRIPTORS_BASED, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_ext_copy}, {.ops = 0x84, .devkey = "O ", /* implemented only for disks */ .info_op_name = "RECEIVE COPY RESULT", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_LOCAL_CMD|SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0x85, .devkey = "O O O ", .info_op_name = "ATA PASS-THROUGH(16)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .info_lba_off = 7, .info_lba_len = 6, .get_cdb_info = get_cdb_info_apt}, {.ops = 0x86, .devkey = "OOOOOOOOOO ", .info_op_name = "ACCESS CONTROL IN", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED| SCST_EXCL_ACCESS_ALLOWED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x87, .devkey = "OOOOOOOOOO ", .info_op_name = "ACCESS CONTROL OUT", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED| SCST_EXCL_ACCESS_ALLOWED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x88, .devkey = "M MMMM ", .info_op_name = "READ(16)", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| #ifdef CONFIG_SCST_TEST_IO_IN_SIRQ SCST_TEST_IO_IN_SIRQ_ALLOWED| #endif SCST_WRITE_EXCL_ALLOWED, .info_lba_off = 2, .info_lba_len = 8, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_read_16}, {.ops = 0x89, .devkey = "O ", .info_op_name = "COMPARE AND WRITE", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| SCST_LOCAL_CMD| SCST_WRITE_MEDIUM|SCST_SCSI_ATOMIC, .info_lba_off = 2, .info_lba_len = 8, .info_len_off = 13, .info_len_len = 1, .get_cdb_info = get_cdb_info_compare_and_write}, {.ops = 0x8A, .devkey = "O OO O ", .info_op_name = "WRITE(16)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| #ifdef CONFIG_SCST_TEST_IO_IN_SIRQ SCST_TEST_IO_IN_SIRQ_ALLOWED| #endif SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 8, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_lba_8_len_4_wrprotect}, {.ops = 0x8C, .devkey = " OOOOOOOOO ", .info_op_name = "READ ATTRIBUTE", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_WRITE_EXCL_ALLOWED, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0x8D, .devkey = " OOOOOOOOO ", .info_op_name = "WRITE ATTRIBUTE", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_WRITE_MEDIUM, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0x8E, .devkey = "O OO O ", .info_op_name = "WRITE AND VERIFY(16)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 8, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_lba_8_len_4_wrprotect}, {.ops = 0x8F, .devkey = "O OO O ", .info_op_name = "VERIFY(16)", .info_data_direction = SCST_DATA_UNKNOWN, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED, .info_lba_off = 2, .info_lba_len = 8, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_verify16}, {.ops = 0x90, .devkey = "O OO O ", .info_op_name = "PRE-FETCH(16)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_WRITE_EXCL_ALLOWED, .info_lba_off = 2, .info_lba_len = 8, .get_cdb_info = get_cdb_info_lba_8_none}, {.ops = 0x91, .devkey = "O OO O ", .info_op_name = "SYNCHRONIZE CACHE(16)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .info_lba_off = 2, .info_lba_len = 8, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_lba_8_none}, {.ops = 0x91, .devkey = " M ", .info_op_name = "SPACE(16)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_EXCL_ALLOWED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x92, .devkey = "O OO O ", .info_op_name = "LOCK UNLOCK CACHE(16)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0x92, .devkey = " O ", .info_op_name = "LOCATE(16)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_EXCL_ALLOWED, .get_cdb_info = get_cdb_info_none}, {.ops = 0x93, .devkey = "O ", .info_op_name = "WRITE SAME(16)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 8, .info_len_off = 10, .info_len_len = 4, .get_cdb_info = get_cdb_info_write_same16}, {.ops = 0x93, .devkey = " M ", .info_op_name = "ERASE(16)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM, .get_cdb_info = get_cdb_info_none}, {.ops = 0x9E, .devkey = "O ", .info_op_name = "SERVICE ACTION IN", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_serv_act_in}, /* 12-bytes length CDB */ {.ops = 0xA0, .devkey = "VVVVVVVVVV M ", .info_op_name = "REPORT LUNS", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_SMALL_TIMEOUT|SCST_IMPLICIT_HQ|SCST_SKIP_UA| SCST_FULLY_LOCAL_CMD|SCST_LOCAL_CMD| SCST_REG_RESERVE_ALLOWED| SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0xA1, .devkey = "O O O ", .info_op_name = "ATA PASS-THROUGH(12)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .info_lba_off = 5, .info_lba_len = 3, .get_cdb_info = get_cdb_info_apt}, {.ops = 0xA1, .devkey = " O ", .info_op_name = "BLANK", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_none}, {.ops = 0xA2, .devkey = "OO O ", .info_op_name = "SECURITY PROTOCOL IN", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0xA3, .devkey = " O ", .info_op_name = "SEND KEY", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 8, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0xA3, .devkey = "OOO O OOOO MO O", .info_op_name = "MAINTENANCE(IN)", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_min}, {.ops = 0xA4, .devkey = " O ", .info_op_name = "REPORT KEY", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 8, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0xA4, .devkey = "OOO O OOOO MO O", .info_op_name = "MAINTENANCE(OUT)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_mo}, {.ops = 0xA5, .devkey = " M ", .info_op_name = "MOVE MEDIUM", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_none}, {.ops = 0xA5, .devkey = " O ", .info_op_name = "PLAY AUDIO(12)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0xA6, .devkey = " O O ", .info_op_name = "EXCHANGE/LOAD/UNLOAD MEDIUM", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_none}, {.ops = 0xA7, .devkey = " O ", .info_op_name = "SET READ AHEAD", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0xA8, .devkey = " O ", .info_op_name = "GET MESSAGE(12)", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0xA8, .devkey = "O OO O ", .info_op_name = "READ(12)", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| #ifdef CONFIG_SCST_TEST_IO_IN_SIRQ SCST_TEST_IO_IN_SIRQ_ALLOWED| #endif SCST_WRITE_EXCL_ALLOWED, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_lba_4_len_4_rdprotect}, {.ops = 0xA9, .devkey = " O ", .info_op_name = "PLAY TRACK RELATIVE(12)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0xAA, .devkey = "O OO O ", .info_op_name = "WRITE(12)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| #ifdef CONFIG_SCST_TEST_IO_IN_SIRQ SCST_TEST_IO_IN_SIRQ_ALLOWED| #endif SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_lba_4_len_4_wrprotect}, {.ops = 0xAA, .devkey = " O ", .info_op_name = "SEND MESSAGE(12)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0xAC, .devkey = " O ", .info_op_name = "ERASE(12)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_WRITE_MEDIUM, .get_cdb_info = get_cdb_info_none}, {.ops = 0xAC, .devkey = " M ", .info_op_name = "GET PERFORMANCE", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_UNKNOWN_LENGTH, .get_cdb_info = get_cdb_info_none}, {.ops = 0xAD, .devkey = " O ", .info_op_name = "READ DVD STRUCTURE", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 8, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0xAE, .devkey = "O OO O ", .info_op_name = "WRITE AND VERIFY(12)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_lba_4_len_4_wrprotect}, {.ops = 0xAF, .devkey = "O OO O ", .info_op_name = "VERIFY(12)", .info_data_direction = SCST_DATA_UNKNOWN, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED, .info_lba_off = 2, .info_lba_len = 4, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_verify12}, {.ops = 0xB3, .devkey = " OO O ", .info_op_name = "SET LIMITS(12)", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0xB5, .devkey = "OO O ", .info_op_name = "SECURITY PROTOCOL OUT", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0xB5, .devkey = " O ", .info_op_name = "REQUEST VOLUME ELEMENT ADDRESS", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0xB6, .devkey = " O ", .info_op_name = "SEND VOLUME TAG", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 9, .info_len_len = 1, .get_cdb_info = get_cdb_info_len_1}, {.ops = 0xB6, .devkey = " M ", .info_op_name = "SET STREAMING", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 9, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0xB7, .devkey = "O O ", .info_op_name = "READ DEFECT DATA(12)", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_WRITE_EXCL_ALLOWED, .info_len_off = 9, .info_len_len = 1, .get_cdb_info = get_cdb_info_len_1}, {.ops = 0xB8, .devkey = " O ", .info_op_name = "READ ELEMENT STATUS", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 7, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3_read_elem_stat}, {.ops = 0xB9, .devkey = " O ", .info_op_name = "READ CD MSF", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_UNKNOWN_LENGTH, .get_cdb_info = get_cdb_info_none}, {.ops = 0xBA, .devkey = " O ", .info_op_name = "SCAN", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_none}, {.ops = 0xBA, .devkey = " O ", .info_op_name = "REDUNDANCY GROUP(IN)", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0xBB, .devkey = " O ", .info_op_name = "SET SPEED", .info_data_direction = SCST_DATA_NONE, .info_op_flags = FLAG_NONE, .get_cdb_info = get_cdb_info_none}, {.ops = 0xBB, .devkey = " O ", .info_op_name = "REDUNDANCY GROUP(OUT)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0xBC, .devkey = " O ", .info_op_name = "SPARE(IN)", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0xBD, .devkey = " O ", .info_op_name = "MECHANISM STATUS", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 8, .info_len_len = 2, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0xBD, .devkey = " O ", .info_op_name = "SPARE(OUT)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0xBE, .devkey = " O ", .info_op_name = "READ CD", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED, .info_len_off = 6, .info_len_len = 3, .get_cdb_info = get_cdb_info_len_3}, {.ops = 0xBE, .devkey = " O ", .info_op_name = "VOLUME SET(IN)", .info_data_direction = SCST_DATA_READ, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0xBF, .devkey = " O ", .info_op_name = "SEND DVD STRUCTUE", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 8, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_2}, {.ops = 0xBF, .devkey = " O ", .info_op_name = "VOLUME SET(OUT)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = FLAG_NONE, .info_len_off = 6, .info_len_len = 4, .get_cdb_info = get_cdb_info_len_4}, {.ops = 0xE7, .devkey = " V ", .info_op_name = "INIT ELEMENT STATUS WRANGE", .info_data_direction = SCST_DATA_NONE, .info_op_flags = SCST_LONG_TIMEOUT, .get_cdb_info = get_cdb_info_len_10} }; #define SCST_CDB_TBL_SIZE ((int)ARRAY_SIZE(scst_scsi_op_table)) static void scst_free_tgt_dev(struct scst_tgt_dev *tgt_dev); static void scst_check_internal_sense(struct scst_device *dev, int result, uint8_t *sense, int sense_len); static void scst_queue_report_luns_changed_UA(struct scst_session *sess, int flags); static void __scst_check_set_UA(struct scst_tgt_dev *tgt_dev, const uint8_t *sense, int sense_len, int flags); static void scst_alloc_set_UA(struct scst_tgt_dev *tgt_dev, const uint8_t *sense, int sense_len, int flags); static void scst_free_all_UA(struct scst_tgt_dev *tgt_dev); static void scst_release_space(struct scst_cmd *cmd); static void scst_clear_reservation(struct scst_tgt_dev *tgt_dev); static int scst_alloc_add_tgt_dev(struct scst_session *sess, struct scst_acg_dev *acg_dev, struct scst_tgt_dev **out_tgt_dev); static void scst_tgt_retry_timer_fn(unsigned long arg); #ifdef CONFIG_SCST_DEBUG_TM static void tm_dbg_init_tgt_dev(struct scst_tgt_dev *tgt_dev); static void tm_dbg_deinit_tgt_dev(struct scst_tgt_dev *tgt_dev); #else static inline void tm_dbg_init_tgt_dev(struct scst_tgt_dev *tgt_dev) {} static inline void tm_dbg_deinit_tgt_dev(struct scst_tgt_dev *tgt_dev) {} #endif /* CONFIG_SCST_DEBUG_TM */ /** * scst_alloc_sense() - allocate sense buffer for command * * Allocates, if necessary, sense buffer for command. Returns 0 on success * and error code otherwise. Parameter "atomic" should be non-0 if the * function called in atomic context. */ int scst_alloc_sense(struct scst_cmd *cmd, int atomic) { int res = 0; gfp_t gfp_mask = atomic ? GFP_ATOMIC : (cmd->cmd_gfp_mask|__GFP_NOFAIL); TRACE_ENTRY(); if (cmd->sense != NULL) goto memzero; cmd->sense = mempool_alloc(scst_sense_mempool, gfp_mask); if (cmd->sense == NULL) { PRINT_CRIT_ERROR("Sense memory allocation failed (op %s). " "The sense data will be lost!!", scst_get_opcode_name(cmd)); res = -ENOMEM; goto out; } cmd->sense_buflen = SCST_SENSE_BUFFERSIZE; memzero: cmd->sense_valid_len = 0; memset(cmd->sense, 0, cmd->sense_buflen); out: TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL(scst_alloc_sense); /** * scst_alloc_set_sense() - allocate and fill sense buffer for command * * Allocates, if necessary, sense buffer for command and copies in * it data from the supplied sense buffer. Returns 0 on success * and error code otherwise. */ int scst_alloc_set_sense(struct scst_cmd *cmd, int atomic, const uint8_t *sense, unsigned int len) { int res; TRACE_ENTRY(); /* * We don't check here if the existing sense is valid or not, because * we suppose the caller did it based on cmd->status. */ res = scst_alloc_sense(cmd, atomic); if (res != 0) { PRINT_BUFFER("Lost sense", sense, len); goto out; } cmd->sense_valid_len = len; if (cmd->sense_buflen < len) { PRINT_WARNING("Sense truncated (needed %d), shall you increase " "SCST_SENSE_BUFFERSIZE? Op: %s", len, scst_get_opcode_name(cmd)); cmd->sense_valid_len = cmd->sense_buflen; } memcpy(cmd->sense, sense, cmd->sense_valid_len); TRACE_BUFFER("Sense set", cmd->sense, cmd->sense_valid_len); out: TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL(scst_alloc_set_sense); /** * scst_set_cmd_error_status() - set error SCSI status * @cmd: SCST command * @status: SCSI status to set * * Description: * Sets error SCSI status in the command and prepares it for returning it. * Returns 0 on success, error code otherwise. */ int scst_set_cmd_error_status(struct scst_cmd *cmd, int status) { int res = 0; TRACE_ENTRY(); if (status == SAM_STAT_RESERVATION_CONFLICT) { TRACE(TRACE_SCSI|TRACE_MINOR, "Reservation conflict (dev %s, " "initiator %s, tgt_id %d)", cmd->dev ? cmd->dev->virt_name : NULL, cmd->sess->initiator_name, cmd->tgt->rel_tgt_id); } if (cmd->status != 0) { TRACE_MGMT_DBG("cmd %p already has status %x set", cmd, cmd->status); res = -EEXIST; goto out; } cmd->status = status; cmd->host_status = DID_OK; cmd->dbl_ua_orig_resp_data_len = cmd->resp_data_len; cmd->dbl_ua_orig_data_direction = cmd->data_direction; cmd->data_direction = SCST_DATA_NONE; cmd->resp_data_len = 0; cmd->resid_possible = 1; cmd->is_send_status = 1; cmd->completed = 1; out: TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL(scst_set_cmd_error_status); static int scst_set_lun_not_supported_request_sense(struct scst_cmd *cmd, int key, int asc, int ascq) { int res; int sense_len, len; struct scatterlist *sg; TRACE_ENTRY(); if (cmd->status != 0) { TRACE_MGMT_DBG("cmd %p already has status %x set", cmd, cmd->status); res = -EEXIST; goto out; } if ((cmd->sg != NULL) && scst_sense_valid(sg_virt(cmd->sg))) { TRACE_MGMT_DBG("cmd %p already has sense set", cmd); res = -EEXIST; goto out; } if (cmd->sg == NULL) { /* * If target driver preparing data buffer using tgt_alloc_data_buf() * callback, it is responsible to copy the sense to its buffer * in xmit_response(). */ if (cmd->tgt_i_data_buf_alloced && (cmd->tgt_i_sg != NULL)) { cmd->sg = cmd->tgt_i_sg; cmd->sg_cnt = cmd->tgt_i_sg_cnt; TRACE_MEM("Tgt sg used for sense for cmd %p", cmd); goto go; } if (cmd->bufflen == 0) cmd->bufflen = cmd->cdb[4]; cmd->sg = scst_alloc_sg(cmd->bufflen, GFP_ATOMIC, &cmd->sg_cnt); if (cmd->sg == NULL) { PRINT_ERROR("Unable to alloc sg for REQUEST SENSE" "(sense %x/%x/%x)", key, asc, ascq); res = 1; goto out; } TRACE_MEM("sg %p alloced for sense for cmd %p (cnt %d, " "len %d)", cmd->sg, cmd, cmd->sg_cnt, cmd->bufflen); } go: sg = cmd->sg; len = sg->length; TRACE_MEM("sg %p (len %d) for sense for cmd %p", sg, len, cmd); sense_len = scst_set_sense(sg_virt(sg), len, cmd->cdb[1] & 1, key, asc, ascq); TRACE_BUFFER("Sense set", sg_virt(sg), sense_len); cmd->data_direction = SCST_DATA_READ; scst_set_resp_data_len(cmd, sense_len); res = 0; cmd->completed = 1; cmd->resid_possible = 1; out: TRACE_EXIT_RES(res); return res; } static int scst_set_lun_not_supported_inquiry(struct scst_cmd *cmd) { int res; uint8_t *buf; struct scatterlist *sg; int len; TRACE_ENTRY(); if (cmd->status != 0) { TRACE_MGMT_DBG("cmd %p already has status %x set", cmd, cmd->status); res = -EEXIST; goto out; } if (cmd->sg == NULL) { if (cmd->bufflen == 0) cmd->bufflen = min_t(int, 36, get_unaligned_be16(&cmd->cdb[3])); /* * If target driver preparing data buffer using tgt_alloc_data_buf() * callback, it is responsible to copy the sense to its buffer * in xmit_response(). */ if (cmd->tgt_i_data_buf_alloced && (cmd->tgt_i_sg != NULL)) { cmd->sg = cmd->tgt_i_sg; cmd->sg_cnt = cmd->tgt_i_sg_cnt; TRACE_MEM("Tgt used for INQUIRY for not supported " "LUN for cmd %p", cmd); goto go; } cmd->sg = scst_alloc_sg(cmd->bufflen, GFP_ATOMIC, &cmd->sg_cnt); if (cmd->sg == NULL) { PRINT_ERROR("%s", "Unable to alloc sg for INQUIRY " "for not supported LUN"); res = 1; goto out; } TRACE_MEM("sg %p alloced for INQUIRY for not supported LUN for " "cmd %p (cnt %d, len %d)", cmd->sg, cmd, cmd->sg_cnt, cmd->bufflen); } go: sg = cmd->sg; len = sg->length; TRACE_MEM("sg %p (len %d) for INQUIRY for cmd %p", sg, len, cmd); buf = sg_virt(sg); len = min_t(int, 36, len); memset(buf, 0, len); buf[0] = 0x7F; /* Peripheral qualifier 011b, Peripheral device type 1Fh */ buf[2] = 6; /* Device complies to SPC-4 */ buf[4] = len - 4; TRACE_BUFFER("INQUIRY for not supported LUN set", buf, len); cmd->data_direction = SCST_DATA_READ; scst_set_resp_data_len(cmd, len); res = 0; cmd->completed = 1; cmd->resid_possible = 1; out: TRACE_EXIT_RES(res); return res; } /** * scst_set_cmd_error() - set error in the command and fill the sense buffer. * * Sets error in the command and fill the sense buffer. Returns 0 on success, * error code otherwise. */ int scst_set_cmd_error(struct scst_cmd *cmd, int key, int asc, int ascq) { int res; TRACE_ENTRY(); /* * We need for LOGICAL UNIT NOT SUPPORTED special handling for * REQUEST SENSE and INQUIRY. */ if ((key == ILLEGAL_REQUEST) && (asc == 0x25) && (ascq == 0)) { if (cmd->cdb[0] == REQUEST_SENSE) res = scst_set_lun_not_supported_request_sense(cmd, key, asc, ascq); else if (cmd->cdb[0] == INQUIRY) res = scst_set_lun_not_supported_inquiry(cmd); else goto do_sense; if (res > 0) goto do_sense; else goto out; } do_sense: res = scst_set_cmd_error_status(cmd, SAM_STAT_CHECK_CONDITION); if (res != 0) goto out; res = scst_alloc_sense(cmd, 1); if (res != 0) { PRINT_ERROR("Lost sense data (key %x, asc %x, ascq %x)", key, asc, ascq); goto out; } cmd->sense_valid_len = scst_set_sense(cmd->sense, cmd->sense_buflen, scst_get_cmd_dev_d_sense(cmd), key, asc, ascq); out: TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL(scst_set_cmd_error); int scst_set_cmd_error_and_inf(struct scst_cmd *cmd, int key, int asc, int ascq, uint64_t information) { int res; res = scst_set_cmd_error(cmd, key, asc, ascq); if (res) goto out; switch (cmd->sense[0] & 0x7f) { case 0x70: { /* Fixed format */ uint32_t i = information; cmd->sense[0] |= 0x80; /* Information field is valid */ put_unaligned_be32(i, &cmd->sense[3]); break; } case 0x72: /* Descriptor format */ cmd->sense[7] = 12; /* additional sense length */ cmd->sense[8 + 0] = 0; /* descriptor type: Information */ cmd->sense[8 + 1] = 10; /* Additional length */ cmd->sense[8 + 2] = 0x80; /* VALID */ put_unaligned_be64(information, &cmd->sense[8 + 4]); break; default: sBUG(); } out: return res; } EXPORT_SYMBOL(scst_set_cmd_error_and_inf); static void scst_fill_field_pointer_sense(uint8_t *fp_sense, int field_offs, int bit_offs, bool cdb) { /* Sense key specific */ fp_sense[0] = 0x80; /* SKSV */ if (cdb) fp_sense[0] |= 0x40; /* C/D */ if ((bit_offs & SCST_INVAL_FIELD_BIT_OFFS_VALID) != 0) fp_sense[0] |= (8 | (bit_offs & 7)); put_unaligned_be16(field_offs, &fp_sense[1]); return; } static int scst_set_invalid_field_in(struct scst_cmd *cmd, int field_offs, int bit_offs, bool cdb) { int res, asc = cdb ? 0x24 : 0x26; /* inval field in CDB or param list */ int d_sense = scst_get_cmd_dev_d_sense(cmd); TRACE_ENTRY(); TRACE_DBG("cmd %p, cdb %d, bit_offs %d, field_offs %d (d_sense %d)", cmd, cdb, bit_offs, field_offs, d_sense); res = scst_set_cmd_error_status(cmd, SAM_STAT_CHECK_CONDITION); if (res != 0) goto out; res = scst_alloc_sense(cmd, 1); if (res != 0) { PRINT_ERROR("Lost %s sense data", cdb ? "INVALID FIELD IN CDB" : "INVALID FIELD IN PARAMETERS LIST"); goto out; } sBUG_ON(cmd->sense_buflen < 18); BUILD_BUG_ON(SCST_SENSE_BUFFERSIZE < 18); if (d_sense) { /* Descriptor format */ cmd->sense[0] = 0x72; cmd->sense[1] = ILLEGAL_REQUEST; cmd->sense[2] = asc; cmd->sense[3] = 0; /* ASCQ */ cmd->sense[7] = 8; /* additional Sense Length */ cmd->sense[8] = 2; /* sense key specific descriptor */ cmd->sense[9] = 6; scst_fill_field_pointer_sense(&cmd->sense[12], field_offs, bit_offs, cdb); cmd->sense_valid_len = 16; } else { /* Fixed format */ cmd->sense[0] = 0x70; cmd->sense[2] = ILLEGAL_REQUEST; cmd->sense[7] = 0x0a; /* additional Sense Length */ cmd->sense[12] = asc; cmd->sense[13] = 0; /* ASCQ */ scst_fill_field_pointer_sense(&cmd->sense[15], field_offs, bit_offs, cdb); cmd->sense_valid_len = 18; } TRACE_BUFFER("Sense set", cmd->sense, cmd->sense_valid_len); out: TRACE_EXIT_RES(res); return res; } int scst_set_invalid_field_in_cdb(struct scst_cmd *cmd, int field_offs, int bit_offs) { return scst_set_invalid_field_in(cmd, field_offs, bit_offs, true); } EXPORT_SYMBOL(scst_set_invalid_field_in_cdb); int scst_set_invalid_field_in_parm_list(struct scst_cmd *cmd, int field_offs, int bit_offs) { return scst_set_invalid_field_in(cmd, field_offs, bit_offs, false); } EXPORT_SYMBOL(scst_set_invalid_field_in_parm_list); /** * scst_set_sense() - set sense from KEY/ASC/ASCQ numbers * * Sets the corresponding fields in the sense buffer taking sense type * into account. Returns resulting sense length. */ int scst_set_sense(uint8_t *buffer, int len, bool d_sense, int key, int asc, int ascq) { int res; sBUG_ON(len == 0); memset(buffer, 0, len); /* * The RESPONSE CODE field shall be set to 70h in all unit attention * condition sense data in which: * a) the ADDITIONAL SENSE CODE field is set to 29h; or * b) the additional sense code is set to MODE PARAMETERS CHANGED. */ if ((key == UNIT_ATTENTION) && ((asc == 0x29) || ((asc == 0x2A) && (ascq == 1)))) d_sense = false; if (d_sense) { /* Descriptor format */ if (len < 8) { PRINT_ERROR("Length %d of sense buffer too small to " "fit sense %x:%x:%x", len, key, asc, ascq); } buffer[0] = 0x72; /* Response Code */ if (len > 1) buffer[1] = key; /* Sense Key */ if (len > 2) buffer[2] = asc; /* ASC */ if (len > 3) buffer[3] = ascq; /* ASCQ */ res = 8; } else { /* Fixed format */ if (len < 18) { PRINT_ERROR("Length %d of sense buffer too small to " "fit sense %x:%x:%x", len, key, asc, ascq); } buffer[0] = 0x70; /* Response Code */ if (len > 2) buffer[2] = key; /* Sense Key */ if (len > 7) buffer[7] = 0x0a; /* Additional Sense Length */ if (len > 12) buffer[12] = asc; /* ASC */ if (len > 13) buffer[13] = ascq; /* ASCQ */ res = 18; } TRACE_BUFFER("Sense set", buffer, res); return res; } EXPORT_SYMBOL(scst_set_sense); /** * scst_analyze_sense() - analyze sense * * Returns true if sense matches to (key, asc, ascq) and false otherwise. * Valid_mask is one or several SCST_SENSE_*_VALID constants setting valid * (key, asc, ascq) values. */ bool scst_analyze_sense(const uint8_t *sense, int len, unsigned int valid_mask, int key, int asc, int ascq) { bool res = false; /* Response Code */ if ((scst_sense_response_code(sense) == 0x70) || (scst_sense_response_code(sense) == 0x71)) { /* Fixed format */ /* Sense Key */ if (valid_mask & SCST_SENSE_KEY_VALID) { if (len < 3) goto out; if (sense[2] != key) goto out; } /* ASC */ if (valid_mask & SCST_SENSE_ASC_VALID) { if (len < 13) goto out; if (sense[12] != asc) goto out; } /* ASCQ */ if (valid_mask & SCST_SENSE_ASCQ_VALID) { if (len < 14) goto out; if (sense[13] != ascq) goto out; } } else if ((scst_sense_response_code(sense) == 0x72) || (scst_sense_response_code(sense) == 0x73)) { /* Descriptor format */ /* Sense Key */ if (valid_mask & SCST_SENSE_KEY_VALID) { if (len < 2) goto out; if (sense[1] != key) goto out; } /* ASC */ if (valid_mask & SCST_SENSE_ASC_VALID) { if (len < 3) goto out; if (sense[2] != asc) goto out; } /* ASCQ */ if (valid_mask & SCST_SENSE_ASCQ_VALID) { if (len < 4) goto out; if (sense[3] != ascq) goto out; } } else { PRINT_ERROR("Unknown sense response code 0x%x", scst_sense_response_code(sense)); goto out; } res = true; out: TRACE_EXIT_RES((int)res); return res; } EXPORT_SYMBOL(scst_analyze_sense); /** * scst_is_ua_sense() - determine if the sense is UA sense * * Returns true if the sense is valid and carrying a Unit * Attention or false otherwise. */ bool scst_is_ua_sense(const uint8_t *sense, int len) { if (scst_sense_valid(sense)) return scst_analyze_sense(sense, len, SCST_SENSE_KEY_VALID, UNIT_ATTENTION, 0, 0); else return false; } EXPORT_SYMBOL(scst_is_ua_sense); bool scst_is_ua_global(const uint8_t *sense, int len) { bool res; /* Changing it don't forget to change scst_requeue_ua() as well!! */ if (scst_analyze_sense(sense, len, SCST_SENSE_ALL_VALID, SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed))) res = true; else res = false; return res; } /** * scst_check_convert_sense() - check sense type and convert it if needed * * Checks if sense in the sense buffer, if any, is in the correct format. * If not, converts it in the correct format. * * WARNING! This function converts only RESPONSE CODE, ASC and ASC codes, * dropping enverything else, including corresponding descriptors from * descriptor format sense! ToDo: fix it. */ void scst_check_convert_sense(struct scst_cmd *cmd) { bool d_sense; TRACE_ENTRY(); if ((cmd->sense == NULL) || (cmd->status != SAM_STAT_CHECK_CONDITION)) goto out; d_sense = scst_get_cmd_dev_d_sense(cmd); if (d_sense && ((scst_sense_response_code(cmd->sense) == 0x70) || (scst_sense_response_code(cmd->sense) == 0x71)) && /* * The RESPONSE CODE field shall be set to 70h in all unit attention * condition sense data in which: * a) the ADDITIONAL SENSE CODE field is set to 29h; or * b) the additional sense code is set to MODE PARAMETERS CHANGED. */ !((cmd->sense[2] == UNIT_ATTENTION) && ((cmd->sense[12] == 0x29) || ((cmd->sense[12] == 0x2A) && (cmd->sense[13] == 1))))) { TRACE_MGMT_DBG("Converting fixed sense to descriptor (cmd %p)", cmd); if ((cmd->sense_valid_len < 18)) { PRINT_ERROR("Sense too small to convert (%d, " "type: fixed)", cmd->sense_buflen); goto out; } cmd->sense_valid_len = scst_set_sense(cmd->sense, cmd->sense_buflen, d_sense, cmd->sense[2], cmd->sense[12], cmd->sense[13]); } else if (!d_sense && ((scst_sense_response_code(cmd->sense) == 0x72) || (scst_sense_response_code(cmd->sense) == 0x73))) { TRACE_MGMT_DBG("Converting descriptor sense to fixed (cmd %p)", cmd); if ((cmd->sense_buflen < 18) || (cmd->sense_valid_len < 8)) { PRINT_ERROR("Sense too small to convert (%d, " "type: descriptor, valid %d)", cmd->sense_buflen, cmd->sense_valid_len); goto out; } cmd->sense_valid_len = scst_set_sense(cmd->sense, cmd->sense_buflen, d_sense, cmd->sense[1], cmd->sense[2], cmd->sense[3]); } out: TRACE_EXIT(); return; } EXPORT_SYMBOL(scst_check_convert_sense); int scst_set_cmd_error_sense(struct scst_cmd *cmd, uint8_t *sense, unsigned int len) { int res; TRACE_ENTRY(); res = scst_set_cmd_error_status(cmd, SAM_STAT_CHECK_CONDITION); if (res != 0) goto out; res = scst_alloc_set_sense(cmd, 1, sense, len); out: TRACE_EXIT_RES(res); return res; } /** * scst_set_busy() - set BUSY or TASK QUEUE FULL status * * Sets BUSY or TASK QUEUE FULL status depending on if this session has other * outstanding commands or not. */ void scst_set_busy(struct scst_cmd *cmd) { int c = atomic_read(&cmd->sess->sess_cmd_count); TRACE_ENTRY(); if ((c <= 1) || (cmd->sess->init_phase != SCST_SESS_IPH_READY)) { scst_set_cmd_error_status(cmd, SAM_STAT_BUSY); TRACE(TRACE_FLOW_CONTROL, "Sending BUSY status to initiator %s " "(cmds count %d, queue_type %x, sess->init_phase %d)", cmd->sess->initiator_name, c, cmd->queue_type, cmd->sess->init_phase); } else { scst_set_cmd_error_status(cmd, SAM_STAT_TASK_SET_FULL); TRACE(TRACE_FLOW_CONTROL, "Sending QUEUE_FULL status to " "initiator %s (cmds count %d, queue_type %x, " "sess->init_phase %d)", cmd->sess->initiator_name, c, cmd->queue_type, cmd->sess->init_phase); } TRACE_EXIT(); return; } EXPORT_SYMBOL(scst_set_busy); /** * scst_set_initial_UA() - set initial Unit Attention * * Sets initial Unit Attention on all devices of the session, * replacing default scst_sense_reset_UA */ void scst_set_initial_UA(struct scst_session *sess, int key, int asc, int ascq) { int i; TRACE_ENTRY(); TRACE_MGMT_DBG("Setting for sess %p initial UA %x/%x/%x", sess, key, asc, ascq); /* To protect sess_tgt_dev_list */ mutex_lock(&scst_mutex); for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { struct list_head *head = &sess->sess_tgt_dev_list[i]; struct scst_tgt_dev *tgt_dev; list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) { spin_lock_bh(&tgt_dev->tgt_dev_lock); if (!list_empty(&tgt_dev->UA_list)) { struct scst_tgt_dev_UA *ua; ua = list_first_entry(&tgt_dev->UA_list, typeof(*ua), UA_list_entry); if (scst_analyze_sense(ua->UA_sense_buffer, ua->UA_valid_sense_len, SCST_SENSE_ALL_VALID, SCST_LOAD_SENSE(scst_sense_reset_UA))) { ua->UA_valid_sense_len = scst_set_sense( ua->UA_sense_buffer, sizeof(ua->UA_sense_buffer), tgt_dev->dev->d_sense, key, asc, ascq); } else PRINT_ERROR("%s", "The first UA isn't RESET UA"); } else PRINT_ERROR("%s", "There's no RESET UA to " "replace"); spin_unlock_bh(&tgt_dev->tgt_dev_lock); } } mutex_unlock(&scst_mutex); TRACE_EXIT(); return; } EXPORT_SYMBOL(scst_set_initial_UA); struct scst_aen *scst_alloc_aen(struct scst_session *sess, uint64_t unpacked_lun) { struct scst_aen *aen; TRACE_ENTRY(); aen = mempool_alloc(scst_aen_mempool, GFP_KERNEL); if (aen == NULL) { PRINT_ERROR("AEN memory allocation failed. Corresponding " "event notification will not be performed (initiator " "%s)", sess->initiator_name); goto out; } memset(aen, 0, sizeof(*aen)); aen->sess = sess; scst_sess_get(sess); aen->lun = scst_pack_lun(unpacked_lun, sess->acg->addr_method); out: TRACE_EXIT_HRES((unsigned long)aen); return aen; } void scst_free_aen(struct scst_aen *aen) { TRACE_ENTRY(); scst_sess_put(aen->sess); mempool_free(aen, scst_aen_mempool); TRACE_EXIT(); return; } /* Must be called under scst_mutex */ void scst_gen_aen_or_ua(struct scst_tgt_dev *tgt_dev, int key, int asc, int ascq) { struct scst_session *sess = tgt_dev->sess; struct scst_tgt_template *tgtt = sess->tgt->tgtt; uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN]; int sl; TRACE_ENTRY(); if (sess->init_phase != SCST_SESS_IPH_READY || sess->shut_phase != SCST_SESS_SPH_READY) goto out; if (tgtt->report_aen != NULL) { struct scst_aen *aen; int rc; aen = scst_alloc_aen(sess, tgt_dev->lun); if (aen == NULL) goto queue_ua; aen->event_fn = SCST_AEN_SCSI; aen->aen_sense_len = scst_set_sense(aen->aen_sense, sizeof(aen->aen_sense), tgt_dev->dev->d_sense, key, asc, ascq); TRACE_DBG("Calling target's %s report_aen(%p)", tgtt->name, aen); rc = tgtt->report_aen(aen); TRACE_DBG("Target's %s report_aen(%p) returned %d", tgtt->name, aen, rc); if (rc == SCST_AEN_RES_SUCCESS) goto out; scst_free_aen(aen); } queue_ua: TRACE_MGMT_DBG("AEN not supported, queueing plain UA (tgt_dev %p)", tgt_dev); sl = scst_set_sense(sense_buffer, sizeof(sense_buffer), tgt_dev->dev->d_sense, key, asc, ascq); scst_check_set_UA(tgt_dev, sense_buffer, sl, 0); out: TRACE_EXIT(); return; } /** * scst_capacity_data_changed() - notify SCST about device capacity change * * Notifies SCST core that dev has changed its capacity. Called under no locks. */ void scst_capacity_data_changed(struct scst_device *dev) { struct scst_tgt_dev *tgt_dev; TRACE_ENTRY(); if (dev->type != TYPE_DISK) { TRACE_MGMT_DBG("Device type %d isn't for CAPACITY DATA " "CHANGED UA", dev->type); goto out; } TRACE_MGMT_DBG("CAPACITY DATA CHANGED (dev %p)", dev); mutex_lock(&scst_mutex); list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { scst_gen_aen_or_ua(tgt_dev, SCST_LOAD_SENSE(scst_sense_capacity_data_changed)); } mutex_unlock(&scst_mutex); out: TRACE_EXIT(); return; } EXPORT_SYMBOL_GPL(scst_capacity_data_changed); static inline bool scst_is_report_luns_changed_type(int type) { switch (type) { case TYPE_DISK: case TYPE_TAPE: case TYPE_PRINTER: case TYPE_PROCESSOR: case TYPE_WORM: case TYPE_ROM: case TYPE_SCANNER: case TYPE_MOD: case TYPE_MEDIUM_CHANGER: case TYPE_RAID: case TYPE_ENCLOSURE: return true; default: return false; } } /* scst_mutex supposed to be held */ static void scst_queue_report_luns_changed_UA(struct scst_session *sess, int flags) { uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN]; struct list_head *head; struct scst_tgt_dev *tgt_dev; int i; TRACE_ENTRY(); TRACE_MGMT_DBG("Queueing REPORTED LUNS DATA CHANGED UA " "(sess %p)", sess); local_bh_disable(); #if !defined(__CHECKER__) for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { head = &sess->sess_tgt_dev_list[i]; list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) { /* Lockdep triggers here a false positive.. */ spin_lock_nolockdep(&tgt_dev->tgt_dev_lock); } } #endif for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { head = &sess->sess_tgt_dev_list[i]; list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) { int sl; if (!scst_is_report_luns_changed_type( tgt_dev->dev->type)) continue; sl = scst_set_sense(sense_buffer, sizeof(sense_buffer), tgt_dev->dev->d_sense, SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed)); __scst_check_set_UA(tgt_dev, sense_buffer, sl, flags | SCST_SET_UA_FLAG_GLOBAL); } } #if !defined(__CHECKER__) for (i = SESS_TGT_DEV_LIST_HASH_SIZE-1; i >= 0; i--) { head = &sess->sess_tgt_dev_list[i]; list_for_each_entry_reverse(tgt_dev, head, sess_tgt_dev_list_entry) { spin_unlock_nolockdep(&tgt_dev->tgt_dev_lock); } } #endif local_bh_enable(); TRACE_EXIT(); return; } /* The activity supposed to be suspended and scst_mutex held */ static void scst_report_luns_changed_sess(struct scst_session *sess) { int i; struct scst_tgt_template *tgtt = sess->tgt->tgtt; int d_sense = 0; uint64_t lun = 0; TRACE_ENTRY(); if ((sess->init_phase != SCST_SESS_IPH_READY) || (sess->shut_phase != SCST_SESS_SPH_READY)) goto out; TRACE_DBG("REPORTED LUNS DATA CHANGED (sess %p)", sess); for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { struct list_head *head; struct scst_tgt_dev *tgt_dev; head = &sess->sess_tgt_dev_list[i]; list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) { if (scst_is_report_luns_changed_type( tgt_dev->dev->type)) { lun = tgt_dev->lun; d_sense = tgt_dev->dev->d_sense; goto found; } } } found: if (tgtt->report_aen != NULL) { struct scst_aen *aen; int rc; aen = scst_alloc_aen(sess, lun); if (aen == NULL) goto queue_ua; aen->event_fn = SCST_AEN_SCSI; aen->aen_sense_len = scst_set_sense(aen->aen_sense, sizeof(aen->aen_sense), d_sense, SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed)); TRACE_DBG("Calling target's %s report_aen(%p)", tgtt->name, aen); rc = tgtt->report_aen(aen); TRACE_DBG("Target's %s report_aen(%p) returned %d", tgtt->name, aen, rc); if (rc == SCST_AEN_RES_SUCCESS) goto out; scst_free_aen(aen); } queue_ua: scst_queue_report_luns_changed_UA(sess, 0); out: TRACE_EXIT(); return; } void scst_report_luns_changed(struct scst_acg *acg) { struct scst_session *sess; TRACE_ENTRY(); /* To protect acg_sess_list */ scst_assert_activity_suspended(); lockdep_assert_held(&scst_mutex); TRACE_DBG("REPORTED LUNS DATA CHANGED (acg %s)", acg->acg_name); list_for_each_entry(sess, &acg->acg_sess_list, acg_sess_list_entry) { scst_report_luns_changed_sess(sess); } TRACE_EXIT(); return; } /** * scst_aen_done() - AEN processing done * * Notifies SCST that the driver has sent the AEN and it * can be freed now. Don't forget to set the delivery status, if it * isn't success, using scst_set_aen_delivery_status() before calling * this function. */ void scst_aen_done(struct scst_aen *aen) { TRACE_ENTRY(); TRACE_MGMT_DBG("AEN %p (fn %d) done (initiator %s)", aen, aen->event_fn, aen->sess->initiator_name); if (aen->delivery_status == SCST_AEN_RES_SUCCESS) goto out_free; if (aen->event_fn != SCST_AEN_SCSI) goto out_free; TRACE_MGMT_DBG("Delivery of SCSI AEN failed (initiator %s)", aen->sess->initiator_name); if (scst_analyze_sense(aen->aen_sense, aen->aen_sense_len, SCST_SENSE_ALL_VALID, SCST_LOAD_SENSE( scst_sense_reported_luns_data_changed))) { mutex_lock(&scst_mutex); scst_queue_report_luns_changed_UA(aen->sess, SCST_SET_UA_FLAG_AT_HEAD); mutex_unlock(&scst_mutex); } else { struct scst_session *sess = aen->sess; struct scst_tgt_dev *tgt_dev; uint64_t lun; lun = scst_unpack_lun((uint8_t *)&aen->lun, sizeof(aen->lun)); mutex_lock(&scst_mutex); /* tgt_dev might get dead, so we need to reseek it */ tgt_dev = scst_lookup_tgt_dev(sess, lun); if (tgt_dev) { TRACE_MGMT_DBG("Requeuing failed AEN UA for tgt_dev %p", tgt_dev); scst_check_set_UA(tgt_dev, aen->aen_sense, aen->aen_sense_len, SCST_SET_UA_FLAG_AT_HEAD); } mutex_unlock(&scst_mutex); } out_free: scst_free_aen(aen); TRACE_EXIT(); return; } EXPORT_SYMBOL(scst_aen_done); void scst_requeue_ua(struct scst_cmd *cmd, const uint8_t *buf, int size) { TRACE_ENTRY(); if (buf == NULL) { buf = cmd->sense; size = cmd->sense_valid_len; } if (scst_analyze_sense(buf, size, SCST_SENSE_ALL_VALID, SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed))) { TRACE_MGMT_DBG("Requeuing REPORTED LUNS DATA CHANGED UA " "for delivery failed cmd %p", cmd); mutex_lock(&scst_mutex); scst_queue_report_luns_changed_UA(cmd->sess, SCST_SET_UA_FLAG_AT_HEAD); mutex_unlock(&scst_mutex); } else { TRACE_MGMT_DBG("Requeuing UA for delivery failed cmd %p", cmd); scst_check_set_UA(cmd->tgt_dev, buf, size, SCST_SET_UA_FLAG_AT_HEAD); } TRACE_EXIT(); return; } void scst_dev_inquiry_data_changed(struct scst_device *dev) { struct scst_tgt_dev *tgt_dev; TRACE_ENTRY(); TRACE_MGMT_DBG("Updating INQUIRY data for dev %s", dev->virt_name); mutex_lock(&scst_mutex); list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { TRACE_DBG("INQUIRY DATA HAS CHANGED on tgt_dev %p", tgt_dev); scst_gen_aen_or_ua(tgt_dev, SCST_LOAD_SENSE(scst_sense_inquiry_data_changed)); } mutex_unlock(&scst_mutex); scst_cm_update_dev(dev); TRACE_EXIT(); return; } EXPORT_SYMBOL(scst_dev_inquiry_data_changed); /* The activity supposed to be suspended and scst_mutex held */ static void scst_check_reassign_sess(struct scst_session *sess) { struct scst_acg *acg, *old_acg; struct scst_acg_dev *acg_dev; int i, rc; struct list_head *head; struct scst_tgt_dev *tgt_dev; bool luns_changed = false; bool add_failed, something_freed; TRACE_ENTRY(); if (sess->shut_phase != SCST_SESS_SPH_READY) goto out; TRACE_DBG("Checking reassignment for sess %p (initiator %s)", sess, sess->initiator_name); acg = scst_find_acg(sess); if (acg == sess->acg) { TRACE_DBG("No reassignment for sess %p", sess); goto out; } PRINT_INFO("sess %p (initiator %s) will be reassigned from acg %s to " "acg %s", sess, sess->initiator_name, sess->acg->acg_name, acg->acg_name); old_acg = sess->acg; sess->acg = NULL; /* to catch implicit dependencies earlier */ retry_add: add_failed = false; list_for_each_entry(acg_dev, &acg->acg_dev_list, acg_dev_list_entry) { bool inq_changed_ua_needed = false; for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { head = &sess->sess_tgt_dev_list[i]; list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) { if ((tgt_dev->dev == acg_dev->dev) && (tgt_dev->lun == acg_dev->lun) && (tgt_dev->acg_dev->acg_dev_rd_only == acg_dev->acg_dev_rd_only)) { TRACE_MGMT_DBG("sess %p: tgt_dev %p for " "LUN %lld stays the same", sess, tgt_dev, (unsigned long long)tgt_dev->lun); tgt_dev->acg_dev = acg_dev; goto next; } else if (tgt_dev->lun == acg_dev->lun) { TRACE_MGMT_DBG("Replacing LUN %lld", (long long)tgt_dev->lun); scst_free_tgt_dev(tgt_dev); inq_changed_ua_needed = 1; break; } } } luns_changed = true; TRACE_MGMT_DBG("sess %p: Allocing new tgt_dev for LUN %lld", sess, (unsigned long long)acg_dev->lun); rc = scst_alloc_add_tgt_dev(sess, acg_dev, &tgt_dev); if (rc == -EPERM) continue; else if (rc != 0) { add_failed = true; break; } tgt_dev->inq_changed_ua_needed = inq_changed_ua_needed; next: continue; } something_freed = false; for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { struct scst_tgt_dev *t; head = &sess->sess_tgt_dev_list[i]; list_for_each_entry_safe(tgt_dev, t, head, sess_tgt_dev_list_entry) { if (tgt_dev->acg_dev->acg != acg) { TRACE_MGMT_DBG("sess %p: Deleting not used " "tgt_dev %p for LUN %lld", sess, tgt_dev, (unsigned long long)tgt_dev->lun); luns_changed = true; something_freed = true; scst_free_tgt_dev(tgt_dev); } } } if (add_failed && something_freed) { TRACE_MGMT_DBG("sess %p: Retrying adding new tgt_devs", sess); goto retry_add; } sess->acg = acg; TRACE_DBG("Moving sess %p from acg %s to acg %s", sess, old_acg->acg_name, acg->acg_name); list_move_tail(&sess->acg_sess_list_entry, &acg->acg_sess_list); scst_get_acg(acg); scst_put_acg(old_acg); #ifndef CONFIG_SCST_PROC scst_recreate_sess_luns_link(sess); /* Ignore possible error, since we can't do anything on it */ #endif if (luns_changed) { scst_report_luns_changed_sess(sess); for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { head = &sess->sess_tgt_dev_list[i]; list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) { if (tgt_dev->inq_changed_ua_needed) { TRACE_MGMT_DBG("sess %p: Setting " "INQUIRY DATA HAS CHANGED UA " "(tgt_dev %p)", sess, tgt_dev); tgt_dev->inq_changed_ua_needed = 0; scst_gen_aen_or_ua(tgt_dev, SCST_LOAD_SENSE(scst_sense_inquiry_data_changed)); } } } } out: TRACE_EXIT(); return; } /* The activity supposed to be suspended and scst_mutex held */ void scst_check_reassign_sessions(void) { struct scst_tgt_template *tgtt; TRACE_ENTRY(); list_for_each_entry(tgtt, &scst_template_list, scst_template_list_entry) { struct scst_tgt *tgt; list_for_each_entry(tgt, &tgtt->tgt_list, tgt_list_entry) { struct scst_session *sess; list_for_each_entry(sess, &tgt->sess_list, sess_list_entry) { scst_check_reassign_sess(sess); } } } TRACE_EXIT(); return; } int scst_get_cmd_abnormal_done_state(struct scst_cmd *cmd) { int res; bool trace = false; TRACE_ENTRY(); switch (cmd->state) { case SCST_CMD_STATE_INIT_WAIT: case SCST_CMD_STATE_INIT: case SCST_CMD_STATE_PARSE: if (cmd->preprocessing_only) { res = SCST_CMD_STATE_PREPROCESSING_DONE; break; } trace = true; /* fall through */ case SCST_CMD_STATE_DEV_DONE: if (cmd->internal) res = SCST_CMD_STATE_FINISHED_INTERNAL; else res = SCST_CMD_STATE_PRE_XMIT_RESP1; break; case SCST_CMD_STATE_PRE_DEV_DONE: case SCST_CMD_STATE_MODE_SELECT_CHECKS: res = SCST_CMD_STATE_DEV_DONE; break; case SCST_CMD_STATE_PRE_XMIT_RESP1: res = SCST_CMD_STATE_PRE_XMIT_RESP2; break; case SCST_CMD_STATE_PRE_XMIT_RESP2: res = SCST_CMD_STATE_XMIT_RESP; break; case SCST_CMD_STATE_PREPROCESSING_DONE: case SCST_CMD_STATE_PREPROCESSING_DONE_CALLED: if (cmd->tgt_dev == NULL) { trace = true; res = SCST_CMD_STATE_PRE_XMIT_RESP1; } else res = SCST_CMD_STATE_PRE_DEV_DONE; break; case SCST_CMD_STATE_PREPARE_SPACE: if (cmd->preprocessing_only) { res = SCST_CMD_STATE_PREPROCESSING_DONE; break; } /* fall through */ case SCST_CMD_STATE_RDY_TO_XFER: case SCST_CMD_STATE_DATA_WAIT: case SCST_CMD_STATE_TGT_PRE_EXEC: case SCST_CMD_STATE_EXEC_CHECK_BLOCKING: case SCST_CMD_STATE_EXEC_CHECK_SN: case SCST_CMD_STATE_LOCAL_EXEC: case SCST_CMD_STATE_REAL_EXEC: case SCST_CMD_STATE_EXEC_WAIT: res = SCST_CMD_STATE_PRE_DEV_DONE; break; default: PRINT_CRIT_ERROR("Wrong cmd state %d (cmd %p, op %s)", cmd->state, cmd, scst_get_opcode_name(cmd)); sBUG(); #if defined(RHEL_MAJOR) && RHEL_MAJOR -0 < 6 /* Invalid state to suppress a compiler warning */ res = SCST_CMD_STATE_LAST_ACTIVE; #endif } if (trace) { /* * Little hack to trace completion of commands, which are * going to bypass normal tracing on SCST_CMD_STATE_PRE_DEV_DONE */ TRACE(TRACE_SCSI, "cmd %p, status %x, msg_status %x, host_status %x, " "driver_status %x, resp_data_len %d", cmd, cmd->status, cmd->msg_status, cmd->host_status, cmd->driver_status, cmd->resp_data_len); if (unlikely(cmd->status == SAM_STAT_CHECK_CONDITION) && scst_sense_valid(cmd->sense)) { PRINT_BUFF_FLAG(TRACE_SCSI, "Sense", cmd->sense, cmd->sense_valid_len); } } TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL_GPL(scst_get_cmd_abnormal_done_state); /** * scst_set_cmd_abnormal_done_state() - set command's next abnormal done state * * Sets state of the SCSI target state machine to abnormally complete command * ASAP. */ void scst_set_cmd_abnormal_done_state(struct scst_cmd *cmd) { TRACE_ENTRY(); #ifdef CONFIG_SCST_EXTRACHECKS switch (cmd->state) { case SCST_CMD_STATE_XMIT_RESP: case SCST_CMD_STATE_FINISHED: case SCST_CMD_STATE_FINISHED_INTERNAL: case SCST_CMD_STATE_XMIT_WAIT: PRINT_CRIT_ERROR("Wrong cmd state %d (cmd %p, op %s)", cmd->state, cmd, scst_get_opcode_name(cmd)); sBUG(); } #endif cmd->state = scst_get_cmd_abnormal_done_state(cmd); switch (cmd->state) { case SCST_CMD_STATE_INIT_WAIT: case SCST_CMD_STATE_INIT: case SCST_CMD_STATE_PARSE: case SCST_CMD_STATE_PREPROCESSING_DONE: case SCST_CMD_STATE_PREPROCESSING_DONE_CALLED: case SCST_CMD_STATE_PREPARE_SPACE: case SCST_CMD_STATE_RDY_TO_XFER: case SCST_CMD_STATE_DATA_WAIT: cmd->write_len = 0; cmd->resid_possible = 1; break; case SCST_CMD_STATE_TGT_PRE_EXEC: case SCST_CMD_STATE_EXEC_CHECK_SN: case SCST_CMD_STATE_EXEC_CHECK_BLOCKING: case SCST_CMD_STATE_LOCAL_EXEC: case SCST_CMD_STATE_REAL_EXEC: case SCST_CMD_STATE_EXEC_WAIT: case SCST_CMD_STATE_DEV_DONE: case SCST_CMD_STATE_PRE_DEV_DONE: case SCST_CMD_STATE_MODE_SELECT_CHECKS: case SCST_CMD_STATE_PRE_XMIT_RESP1: case SCST_CMD_STATE_PRE_XMIT_RESP2: case SCST_CMD_STATE_FINISHED_INTERNAL: break; default: PRINT_CRIT_ERROR("Wrong cmd state %d (cmd %p, op %s)", cmd->state, cmd, scst_get_opcode_name(cmd)); sBUG(); break; } #ifdef CONFIG_SCST_EXTRACHECKS if (((cmd->state != SCST_CMD_STATE_PRE_XMIT_RESP1) && (cmd->state != SCST_CMD_STATE_PREPROCESSING_DONE)) && (cmd->tgt_dev == NULL) && !cmd->internal) { PRINT_CRIT_ERROR("Wrong not inited cmd state %d (cmd %p, " "op %s)", cmd->state, cmd, scst_get_opcode_name(cmd)); sBUG(); } #endif TRACE_EXIT(); return; } EXPORT_SYMBOL_GPL(scst_set_cmd_abnormal_done_state); #if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING) const char *scst_get_opcode_name(struct scst_cmd *cmd) { if (cmd->op_name) return cmd->op_name; else { scnprintf(cmd->not_parsed_op_name, sizeof(cmd->not_parsed_op_name), "0x%x", cmd->cdb[0]); return cmd->not_parsed_op_name; } } EXPORT_SYMBOL(scst_get_opcode_name); #endif void scst_zero_write_rest(struct scst_cmd *cmd) { int len, offs = 0; uint8_t *buf; TRACE_ENTRY(); len = scst_get_sg_buf_first(cmd, &buf, *cmd->write_sg, *cmd->write_sg_cnt); while (len > 0) { int cur_offs; if (offs + len <= cmd->write_len) goto next; else if (offs >= cmd->write_len) cur_offs = 0; else cur_offs = cmd->write_len - offs; memset(&buf[cur_offs], 0, len - cur_offs); next: offs += len; scst_put_sg_buf(cmd, buf, *cmd->write_sg, *cmd->write_sg_cnt); len = scst_get_sg_buf_next(cmd, &buf, *cmd->write_sg, *cmd->write_sg_cnt); } TRACE_EXIT(); return; } static bool __scst_adjust_sg(struct scst_cmd *cmd, struct scatterlist *sg, int *sg_cnt, int adjust_len, struct scst_orig_sg_data *orig_sg) { struct scatterlist *sgi; int i, l; bool res = false; TRACE_ENTRY(); l = 0; for_each_sg(sg, sgi, *sg_cnt, i) { #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) TRACE_DBG("i %d, sg_cnt %d, sg %p, page_link %lx, len %d", i, *sg_cnt, sg, sgi->page_link, sgi->length); #else TRACE_DBG("i %d, sg_cnt %d, sg %p, page_link %lx", i, *sg_cnt, sg, 0UL); #endif l += sgi->length; if (l >= adjust_len) { int left = adjust_len - (l - sgi->length); TRACE_DBG_FLAG(TRACE_SG_OP|TRACE_MEMORY|TRACE_DEBUG, "cmd %p (tag %llu), sg %p, sg_cnt %d, " "adjust_len %d, i %d, sg[j].length %d, left %d", cmd, (unsigned long long int)cmd->tag, sg, *sg_cnt, adjust_len, i, sgi->length, left); orig_sg->p_orig_sg_cnt = sg_cnt; orig_sg->orig_sg_cnt = *sg_cnt; orig_sg->orig_sg_entry = sgi; orig_sg->orig_entry_offs = sgi->offset; orig_sg->orig_entry_len = sgi->length; *sg_cnt = (left > 0) ? i+1 : i; sgi->length = left; res = true; break; } } TRACE_EXIT_RES(res); return res; } /* * Makes cmd's SG shorter on adjust_len bytes. Reg_sg is true for cmd->sg * and false for cmd->write_sg. */ static void scst_adjust_sg(struct scst_cmd *cmd, bool reg_sg, int adjust_len) { struct scatterlist *sg; int *sg_cnt; bool adjust_dif; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(cmd->sg_buff_modified || cmd->dif_sg_buff_modified); if (reg_sg) { sg = cmd->sg; sg_cnt = &cmd->sg_cnt; adjust_dif = (cmd->dif_sg != NULL); } else { sg = *cmd->write_sg; sg_cnt = cmd->write_sg_cnt; if (sg == cmd->sg) adjust_dif = (cmd->dif_sg != NULL); else adjust_dif = false; } TRACE_DBG("reg_sg %d, adjust_len %d, adjust_dif %d", reg_sg, adjust_len, adjust_dif); cmd->sg_buff_modified = !!__scst_adjust_sg(cmd, sg, sg_cnt, adjust_len, &cmd->orig_sg); if (adjust_dif) { adjust_len >>= (cmd->dev->block_shift - SCST_DIF_TAG_SHIFT); TRACE_DBG("DIF adjust_len %d", adjust_len); cmd->dif_sg_buff_modified = __scst_adjust_sg(cmd, cmd->dif_sg, &cmd->dif_sg_cnt, adjust_len, &cmd->orig_dif_sg); } TRACE_EXIT(); return; } static int __scst_adjust_sg_get_tail(struct scst_cmd *cmd, struct scatterlist *sg, int *sg_cnt, struct scatterlist **res_sg, int *res_sg_cnt, int adjust_len, struct scst_orig_sg_data *orig_sg, int must_left) { int res = -ENOENT, i, j, l; TRACE_ENTRY(); TRACE_DBG("cmd %p, sg_cnt %d, sg %p", cmd, *sg_cnt, sg); l = 0; for (i = 0, j = 0; i < *sg_cnt; i++, j++) { #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) TRACE_DBG("i %d, j %d, sg %p, page_link %lx, len %d", i, j, sg, sg[j].page_link, sg->length); #else TRACE_DBG("i %d, j %d, sg %p", i, j, sg); #endif if (unlikely(sg_is_chain(&sg[j]))) { sg = sg_chain_ptr(&sg[j]); j = 0; } l += sg[j].length; if (l >= adjust_len) { int offs = adjust_len - (l - sg[j].length); TRACE_DBG_FLAG(TRACE_SG_OP|TRACE_MEMORY|TRACE_DEBUG, "cmd %p (tag %llu), sg %p, adjust_len %d, i %d, " "j %d, sg[j].length %d, offs %d", cmd, (unsigned long long)cmd->tag, sg, adjust_len, i, j, sg[j].length, offs); if (offs == sg[j].length) { j++; offs = 0; } orig_sg->p_orig_sg_cnt = sg_cnt; orig_sg->orig_sg_cnt = *sg_cnt; orig_sg->orig_sg_entry = &sg[j]; orig_sg->orig_entry_offs = sg[j].offset; orig_sg->orig_entry_len = sg[j].length; sg[j].offset += offs; sg[j].length -= offs; *res_sg = &sg[j]; *res_sg_cnt = *sg_cnt - j; TRACE_DBG("j %d, sg %p, off %d, len %d, cnt %d " "(offs %d)", j, &sg[j], sg[j].offset, sg[j].length, *res_sg_cnt, offs); res = 0; break; } } if (res != 0) goto out; #ifdef CONFIG_SCST_EXTRACHECKS l = 0; sg = *res_sg; for (i = 0; i < *res_sg_cnt; i++) l += sg[i].length; if (l != must_left) { PRINT_ERROR("Incorrect length %d of adjusted sg (cmd %p, " "expected %d)", l, cmd, must_left); res = -EINVAL; scst_check_restore_sg_buff(cmd); goto out; } #endif out: TRACE_EXIT_RES(res); return res; } /* * Returns in res_sg the tail of cmd's adjusted on adjust_len, i.e. tail * of it. In res_sg_cnt sg_cnt of res_sg returned. Cmd only used to store * cmd->sg restore information. * * Parameter must_left defines how many bytes must left in res_sg to consider * operation successful. * * Returns 0 on success or error code otherwise. * * NOTE! Before scst_restore_sg_buff() called cmd->sg is corrupted and * can NOT be used! */ static int scst_adjust_sg_get_tail(struct scst_cmd *cmd, struct scatterlist **res_sg, int *res_sg_cnt, struct scatterlist **res_dif_sg, int *res_dif_sg_cnt, int adjust_len, int must_left) { int res; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(cmd->sg_buff_modified || cmd->dif_sg_buff_modified); res = __scst_adjust_sg_get_tail(cmd, cmd->sg, &cmd->sg_cnt, res_sg, res_sg_cnt, adjust_len, &cmd->orig_sg, must_left); if (res != 0) goto out; cmd->sg_buff_modified = 1; if (cmd->dif_sg != NULL) { adjust_len >>= (cmd->dev->block_shift - SCST_DIF_TAG_SHIFT); must_left >>= (cmd->dev->block_shift - SCST_DIF_TAG_SHIFT); TRACE_DBG("DIF adjust_len %d, must_left %d", adjust_len, must_left); res = __scst_adjust_sg_get_tail(cmd, cmd->dif_sg, &cmd->dif_sg_cnt, res_dif_sg, res_dif_sg_cnt, adjust_len, &cmd->orig_dif_sg, must_left); if (res != 0) { scst_restore_sg_buff(cmd); goto out; } cmd->dif_sg_buff_modified = 1; } out: TRACE_EXIT_RES(res); return res; } /** * scst_restore_sg_buff() - restores modified sg buffer * * Restores modified sg buffer in the original state. */ void scst_restore_sg_buff(struct scst_cmd *cmd) { TRACE_DBG_FLAG(TRACE_DEBUG|TRACE_MEMORY, "cmd %p, sg %p, DATA: " "orig_sg_entry %p, orig_entry_offs %d, orig_entry_len %d, " "orig_sg_cnt %d, DIF: orig_sg_entry %p, " "orig_entry_offs %d, orig_entry_len %d, orig_sg_cnt %d", cmd, cmd->sg, cmd->orig_sg.orig_sg_entry, cmd->orig_sg.orig_entry_offs, cmd->orig_sg.orig_entry_len, cmd->orig_sg.orig_sg_cnt, cmd->orig_dif_sg.orig_sg_entry, cmd->orig_dif_sg.orig_entry_offs, cmd->orig_dif_sg.orig_entry_len, cmd->orig_dif_sg.orig_sg_cnt); EXTRACHECKS_BUG_ON(!(cmd->sg_buff_modified || cmd->dif_sg_buff_modified)); if (cmd->sg_buff_modified) { cmd->orig_sg.orig_sg_entry->offset = cmd->orig_sg.orig_entry_offs; cmd->orig_sg.orig_sg_entry->length = cmd->orig_sg.orig_entry_len; *cmd->orig_sg.p_orig_sg_cnt = cmd->orig_sg.orig_sg_cnt; } if (cmd->dif_sg_buff_modified) { cmd->orig_dif_sg.orig_sg_entry->offset = cmd->orig_dif_sg.orig_entry_offs; cmd->orig_dif_sg.orig_sg_entry->length = cmd->orig_dif_sg.orig_entry_len; *cmd->orig_dif_sg.p_orig_sg_cnt = cmd->orig_dif_sg.orig_sg_cnt; } cmd->sg_buff_modified = 0; cmd->dif_sg_buff_modified = 0; } EXPORT_SYMBOL(scst_restore_sg_buff); /** * scst_set_resp_data_len() - set response data length * * Sets response data length for cmd and truncates its SG vector accordingly. * * The cmd->resp_data_len must not be set directly, it must be set only * using this function. Value of resp_data_len must be <= cmd->bufflen. */ void scst_set_resp_data_len(struct scst_cmd *cmd, int resp_data_len) { TRACE_ENTRY(); scst_check_restore_sg_buff(cmd); cmd->resp_data_len = resp_data_len; if (resp_data_len == cmd->bufflen) goto out; TRACE_DBG("cmd %p, resp_data_len %d", cmd, resp_data_len); if (unlikely(resp_data_len > cmd->bufflen)) { PRINT_ERROR("Too big response data len %d (max %d), limiting " "it to the max (dev %s)", resp_data_len, cmd->bufflen, cmd->dev ? cmd->dev->virt_name : "(no LUN)"); /* * It's a bug in the lower level code, so dump stack to know * who is the cause */ dump_stack(); cmd->resp_data_len = cmd->bufflen; goto out; } scst_adjust_sg(cmd, true, resp_data_len); cmd->resid_possible = 1; out: TRACE_EXIT(); return; } EXPORT_SYMBOL_GPL(scst_set_resp_data_len); void scst_limit_sg_write_len(struct scst_cmd *cmd) { TRACE_ENTRY(); TRACE_MEM("Limiting sg write len to %d (cmd %p, sg %p, sg_cnt %d)", cmd->write_len, cmd, *cmd->write_sg, *cmd->write_sg_cnt); scst_check_restore_sg_buff(cmd); scst_adjust_sg(cmd, false, cmd->write_len); TRACE_EXIT(); return; } static int scst_full_len_to_data_len(int full_len, int block_shift) { int rem, res; res = full_len << block_shift; rem = do_div(res, (1 << block_shift) + (1 << SCST_DIF_TAG_SHIFT)); if (unlikely(rem != 0)) TRACE(TRACE_MINOR, "Reminder %d for full len! (full len%d)", rem, full_len); TRACE_DBG("data len %d (full %d)", res, full_len); return res; } /* * Returns data expected transfer length, i.e. expected transfer length, * adjusted on DIF tags expected transfer length, if any. * * Very expensive, don't call on fast path! */ int scst_cmd_get_expected_transfer_len_data(struct scst_cmd *cmd) { int rem, res; if (!cmd->tgt_dif_data_expected) return cmd->expected_transfer_len_full; res = cmd->expected_transfer_len_full << cmd->dev->block_shift; rem = do_div(res, cmd->dev->block_size + (1 << SCST_DIF_TAG_SHIFT)); if (unlikely(rem != 0)) TRACE(TRACE_MINOR, "Reminder %d for expected transfer len " "data! (cmd %p, op %s, expected len full %d)", rem, cmd, scst_get_opcode_name(cmd), cmd->expected_transfer_len_full); TRACE_DBG("Expected transfer len data %d (cmd %p)", res, cmd); return res; } /* * Returns DIF tags expected transfer length. * * Very expensive, don't call on fast path! */ int scst_cmd_get_expected_transfer_len_dif(struct scst_cmd *cmd) { int rem, res; if (!cmd->tgt_dif_data_expected) return 0; res = cmd->expected_transfer_len_full << SCST_DIF_TAG_SHIFT; rem = do_div(res, cmd->dev->block_size + (1 << SCST_DIF_TAG_SHIFT)); if (unlikely(rem != 0)) TRACE(TRACE_MINOR, "Reminder %d for expected transfer len dif! " "(cmd %p, op %s, expected len full %d)", rem, cmd, scst_get_opcode_name(cmd), cmd->expected_transfer_len_full); TRACE_DBG("Expected transfer len DIF %d (cmd %p)", res, cmd); return res; } void scst_adjust_resp_data_len(struct scst_cmd *cmd) { TRACE_ENTRY(); if (!cmd->expected_values_set) { cmd->adjusted_resp_data_len = cmd->resp_data_len; goto out; } cmd->adjusted_resp_data_len = min(cmd->resp_data_len, scst_cmd_get_expected_transfer_len_data(cmd)); if (cmd->adjusted_resp_data_len != cmd->resp_data_len) { TRACE_MEM("Adjusting resp_data_len to %d (cmd %p, sg %p, " "sg_cnt %d)", cmd->adjusted_resp_data_len, cmd, cmd->sg, cmd->sg_cnt); scst_check_restore_sg_buff(cmd); scst_adjust_sg(cmd, true, cmd->adjusted_resp_data_len); } out: TRACE_EXIT(); return; } /** * scst_cmd_set_write_not_received_data_len() - sets cmd's not received len * * Sets cmd's not received data length. Also automatically sets resid_possible. */ void scst_cmd_set_write_not_received_data_len(struct scst_cmd *cmd, int not_received) { TRACE_ENTRY(); cmd->write_not_received_set = 1; if (!cmd->expected_values_set) { /* * No expected values set, so no residuals processing. * It can happen if a command preliminary completed before * target driver had a chance to set expected values. */ TRACE_MGMT_DBG("No expected values set, ignoring (cmd %p)", cmd); goto out; } cmd->resid_possible = 1; if ((cmd->expected_data_direction & SCST_DATA_READ) && (cmd->expected_data_direction & SCST_DATA_WRITE)) { cmd->write_len = cmd->expected_out_transfer_len - not_received; if (cmd->write_len == cmd->out_bufflen) goto out; } else if (cmd->expected_data_direction & SCST_DATA_WRITE) { cmd->write_len = cmd->expected_transfer_len_full - not_received; if (cmd->tgt_dif_data_expected) cmd->write_len = scst_full_len_to_data_len(cmd->write_len, cmd->dev->block_shift); if (cmd->write_len == cmd->bufflen) goto out; } /* * Write len now can be bigger cmd->(out_)bufflen, but that's OK, * because it will be used to only calculate write residuals. */ TRACE_DBG("cmd %p, not_received %d, write_len %d", cmd, not_received, cmd->write_len); if (cmd->data_direction & SCST_DATA_WRITE) scst_limit_sg_write_len(cmd); out: TRACE_EXIT(); return; } EXPORT_SYMBOL(scst_cmd_set_write_not_received_data_len); void scst_cmd_set_write_no_data_received(struct scst_cmd *cmd) { int w; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(cmd->expected_values_set && ((cmd->expected_data_direction & SCST_DATA_WRITE) == 0)); if ((cmd->expected_data_direction & SCST_DATA_READ) && (cmd->expected_data_direction & SCST_DATA_WRITE)) w = cmd->expected_out_transfer_len; else w = cmd->expected_transfer_len_full; scst_cmd_set_write_not_received_data_len(cmd, w); TRACE_EXIT(); return; } /** * __scst_get_resid() - returns residuals for cmd * * Returns residuals for command. Must not be called directly, use * scst_get_resid() instead. */ bool __scst_get_resid(struct scst_cmd *cmd, int *resid, int *bidi_out_resid) { bool res; TRACE_ENTRY(); *resid = 0; if (bidi_out_resid != NULL) *bidi_out_resid = 0; if (!cmd->expected_values_set) { /* * No expected values set, so no residuals processing. * It can happen if a command preliminary completed before * target driver had a chance to set expected values. */ TRACE_MGMT_DBG("No expected values set, returning no residual " "(cmd %p)", cmd); res = false; goto out; } if (cmd->expected_data_direction & SCST_DATA_READ) { int resp = cmd->resp_data_len; if (cmd->tgt_dif_data_expected) resp += (resp >> cmd->dev->block_shift) << SCST_DIF_TAG_SHIFT; *resid = cmd->expected_transfer_len_full - resp; if ((cmd->expected_data_direction & SCST_DATA_WRITE) && bidi_out_resid) { if (cmd->write_len < cmd->expected_out_transfer_len) *bidi_out_resid = cmd->expected_out_transfer_len - cmd->write_len; else *bidi_out_resid = cmd->write_len - cmd->out_bufflen; } } else if (cmd->expected_data_direction & SCST_DATA_WRITE) { int wl = cmd->write_len; if (cmd->tgt_dif_data_expected) wl += (wl >> cmd->dev->block_shift) << SCST_DIF_TAG_SHIFT; if (wl < cmd->expected_transfer_len_full) *resid = cmd->expected_transfer_len_full - wl; else { *resid = cmd->write_len - cmd->bufflen; if (cmd->tgt_dif_data_expected) { int r = *resid; if (r < 0) r = -r; r += (r >> cmd->dev->block_shift) << SCST_DIF_TAG_SHIFT; if (*resid > 0) *resid = r; else *resid = -r; } } } res = true; TRACE_DBG("cmd %p, resid %d, bidi_out_resid %d (resp_data_len %d, " "expected_data_direction %d, write_len %d, bufflen %d, " "tgt_dif_data_expected %d)", cmd, *resid, bidi_out_resid ? *bidi_out_resid : 0, cmd->resp_data_len, cmd->expected_data_direction, cmd->write_len, cmd->bufflen, cmd->tgt_dif_data_expected); out: TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL(__scst_get_resid); /* No locks */ void scst_queue_retry_cmd(struct scst_cmd *cmd) { struct scst_tgt *tgt = cmd->tgt; unsigned long flags; TRACE_ENTRY(); spin_lock_irqsave(&tgt->tgt_lock, flags); tgt->retry_cmds++; TRACE_RETRY("Adding cmd %p to retry cmd list", cmd); list_add_tail(&cmd->cmd_list_entry, &tgt->retry_cmd_list); if (!tgt->retry_timer_active) { TRACE_DBG("Activating retry timer for tgt %p", tgt); tgt->retry_timer.expires = jiffies + SCST_TGT_RETRY_TIMEOUT; add_timer(&tgt->retry_timer); tgt->retry_timer_active = 1; } spin_unlock_irqrestore(&tgt->tgt_lock, flags); TRACE_EXIT(); return; } /** * scst_update_hw_pending_start() - update commands pending start * * Updates the command's hw_pending_start as if it's just started hw pending. * Target drivers should call it if they received reply from this pending * command, but SCST core won't see it. */ void scst_update_hw_pending_start(struct scst_cmd *cmd) { unsigned long flags; TRACE_ENTRY(); /* To sync with scst_check_hw_pending_cmd() */ spin_lock_irqsave(&cmd->sess->sess_list_lock, flags); cmd->hw_pending_start = jiffies; TRACE_MGMT_DBG("Updated hw_pending_start to %ld (cmd %p)", cmd->hw_pending_start, cmd); spin_unlock_irqrestore(&cmd->sess->sess_list_lock, flags); TRACE_EXIT(); return; } EXPORT_SYMBOL_GPL(scst_update_hw_pending_start); /* * Supposed to be called under sess_list_lock, but can release/reacquire it. * Returns 0 to continue, >0 to restart, <0 to break. */ static int scst_check_hw_pending_cmd(struct scst_cmd *cmd, unsigned long cur_time, unsigned long max_time, struct scst_session *sess, unsigned long *flags, struct scst_tgt_template *tgtt) { int res = -1; /* break */ TRACE_DBG("cmd %p, hw_pending %d, proc time %ld, " "pending time %ld", cmd, cmd->cmd_hw_pending, (long)(cur_time - cmd->start_time) / HZ, (long)(cur_time - cmd->hw_pending_start) / HZ); if (time_before(cur_time, cmd->start_time + max_time)) { /* Cmds are ordered, so no need to check more */ goto out; } if (!cmd->cmd_hw_pending) { res = 0; /* continue */ goto out; } if (time_before(cur_time, cmd->hw_pending_start + max_time)) { res = 0; /* continue */ goto out; } TRACE(TRACE_MGMT, "Cmd %p HW pending for too long %ld (state %x)", cmd, (cur_time - cmd->hw_pending_start) / HZ, cmd->state); cmd->cmd_hw_pending = 0; spin_unlock_irqrestore(&sess->sess_list_lock, *flags); tgtt->on_hw_pending_cmd_timeout(cmd); spin_lock_irqsave(&sess->sess_list_lock, *flags); res = 1; /* restart */ out: TRACE_EXIT_RES(res); return res; } #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) static void scst_hw_pending_work_fn(void *p) #else static void scst_hw_pending_work_fn(struct work_struct *work) #endif { #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) struct scst_session *sess = (struct scst_session *)p; #else struct scst_session *sess = container_of(work, struct scst_session, hw_pending_work.work); #endif struct scst_tgt_template *tgtt = sess->tgt->tgtt; struct scst_cmd *cmd; unsigned long cur_time = jiffies; unsigned long flags; unsigned long max_time = tgtt->max_hw_pending_time * HZ; TRACE_ENTRY(); TRACE_DBG("HW pending work (sess %p, max time %ld)", sess, max_time/HZ); clear_bit(SCST_SESS_HW_PENDING_WORK_SCHEDULED, &sess->sess_aflags); spin_lock_irqsave(&sess->sess_list_lock, flags); restart: list_for_each_entry(cmd, &sess->sess_cmd_list, sess_cmd_list_entry) { int rc; rc = scst_check_hw_pending_cmd(cmd, cur_time, max_time, sess, &flags, tgtt); if (rc < 0) break; else if (rc == 0) continue; else goto restart; } if (!list_empty(&sess->sess_cmd_list)) { /* * For stuck cmds if there is no activity we might need to have * one more run to release them, so reschedule once again. */ TRACE_DBG("Sched HW pending work for sess %p (max time %d)", sess, tgtt->max_hw_pending_time); set_bit(SCST_SESS_HW_PENDING_WORK_SCHEDULED, &sess->sess_aflags); schedule_delayed_work(&sess->hw_pending_work, tgtt->max_hw_pending_time * HZ); } spin_unlock_irqrestore(&sess->sess_list_lock, flags); TRACE_EXIT(); return; } static bool __scst_is_relative_target_port_id_unique(uint16_t id, const struct scst_tgt *t) { bool res = true; struct scst_tgt_template *tgtt; TRACE_ENTRY(); list_for_each_entry(tgtt, &scst_template_list, scst_template_list_entry) { struct scst_tgt *tgt; list_for_each_entry(tgt, &tgtt->tgt_list, tgt_list_entry) { if (tgt == t) continue; if ((tgt->tgtt->is_target_enabled != NULL) && !tgt->tgtt->is_target_enabled(tgt)) continue; if (id == tgt->rel_tgt_id) { res = false; break; } } } TRACE_EXIT_RES(res); return res; } /* scst_mutex supposed to be locked */ bool scst_is_relative_target_port_id_unique(uint16_t id, const struct scst_tgt *t) { bool res; TRACE_ENTRY(); mutex_lock(&scst_mutex); res = __scst_is_relative_target_port_id_unique(id, t); mutex_unlock(&scst_mutex); TRACE_EXIT_RES(res); return res; } int gen_relative_target_port_id(uint16_t *id) { int res = -EOVERFLOW; static unsigned long rti = SCST_MIN_REL_TGT_ID, rti_prev; TRACE_ENTRY(); res = mutex_lock_interruptible(&scst_mutex); if (res != 0) goto out; rti_prev = rti; do { if (__scst_is_relative_target_port_id_unique(rti, NULL)) { *id = (uint16_t)rti++; res = 0; goto out_unlock; } rti++; if (rti > SCST_MAX_REL_TGT_ID) rti = SCST_MIN_REL_TGT_ID; } while (rti != rti_prev); PRINT_ERROR("%s", "Unable to create unique relative target port id"); out_unlock: mutex_unlock(&scst_mutex); out: TRACE_EXIT_RES(res); return res; } /* No locks */ int scst_alloc_tgt(struct scst_tgt_template *tgtt, struct scst_tgt **tgt) { struct scst_tgt *t; int res = 0; TRACE_ENTRY(); t = kmem_cache_zalloc(scst_tgt_cachep, GFP_KERNEL); if (t == NULL) { PRINT_ERROR("%s", "Allocation of tgt failed"); res = -ENOMEM; goto out; } INIT_LIST_HEAD(&t->sess_list); INIT_LIST_HEAD(&t->sysfs_sess_list); init_waitqueue_head(&t->unreg_waitQ); t->tgtt = tgtt; t->sg_tablesize = tgtt->sg_tablesize; t->tgt_dif_supported = tgtt->dif_supported; t->tgt_hw_dif_type1_supported = tgtt->hw_dif_type1_supported; t->tgt_hw_dif_type2_supported = tgtt->hw_dif_type2_supported; t->tgt_hw_dif_type3_supported = tgtt->hw_dif_type3_supported; t->tgt_hw_dif_ip_supported = tgtt->hw_dif_ip_supported; t->tgt_hw_dif_same_sg_layout_required = tgtt->hw_dif_same_sg_layout_required; t->tgt_supported_dif_block_sizes = tgtt->supported_dif_block_sizes; spin_lock_init(&t->tgt_lock); INIT_LIST_HEAD(&t->retry_cmd_list); init_timer(&t->retry_timer); t->retry_timer.data = (unsigned long)t; t->retry_timer.function = scst_tgt_retry_timer_fn; atomic_set(&t->tgt_dif_app_failed_tgt, 0); atomic_set(&t->tgt_dif_ref_failed_tgt, 0); atomic_set(&t->tgt_dif_guard_failed_tgt, 0); atomic_set(&t->tgt_dif_app_failed_scst, 0); atomic_set(&t->tgt_dif_ref_failed_scst, 0); atomic_set(&t->tgt_dif_guard_failed_scst, 0); atomic_set(&t->tgt_dif_app_failed_dev, 0); atomic_set(&t->tgt_dif_ref_failed_dev, 0); atomic_set(&t->tgt_dif_guard_failed_dev, 0); #ifdef CONFIG_SCST_PROC res = gen_relative_target_port_id(&t->rel_tgt_id); if (res != 0) { scst_free_tgt(t); goto out; } #else INIT_LIST_HEAD(&t->tgt_acg_list); #endif *tgt = t; out: TRACE_EXIT_HRES(res); return res; } /* No locks */ void scst_free_tgt(struct scst_tgt *tgt) { TRACE_ENTRY(); kfree(tgt->tgt_name); kfree(tgt->tgt_comment); #ifdef CONFIG_SCST_PROC kfree(tgt->default_group_name); #endif kmem_cache_free(scst_tgt_cachep, tgt); TRACE_EXIT(); return; } static void scst_init_order_data(struct scst_order_data *order_data) { int i; spin_lock_init(&order_data->sn_lock); INIT_LIST_HEAD(&order_data->deferred_cmd_list); INIT_LIST_HEAD(&order_data->skipped_sn_list); order_data->curr_sn = (typeof(order_data->curr_sn))(-20); order_data->expected_sn = order_data->curr_sn; order_data->cur_sn_slot = &order_data->sn_slots[0]; for (i = 0; i < (int)ARRAY_SIZE(order_data->sn_slots); i++) atomic_set(&order_data->sn_slots[i], 0); spin_lock_init(&order_data->init_done_lock); return; } #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) static void scst_ext_blocking_done_fn(void *p); #else static void scst_ext_blocking_done_fn(struct work_struct *work); #endif static int scst_dif_none(struct scst_cmd *cmd); #ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS static int scst_dif_none_type1(struct scst_cmd *cmd); #else #define scst_dif_none_type1 scst_dif_none #endif /* Called under scst_mutex and suspended activity */ int scst_alloc_device(gfp_t gfp_mask, int nodeid, struct scst_device **out_dev) { struct scst_device *dev; int res = 0; TRACE_ENTRY(); dev = kmem_cache_alloc_node(scst_dev_cachep, gfp_mask, nodeid); if (dev == NULL) { PRINT_ERROR("%s", "Allocation of scst_device failed"); res = -ENOMEM; goto out; } memset(dev, 0, sizeof(*dev)); dev->handler = &scst_null_devtype; #ifdef CONFIG_SCST_PER_DEVICE_CMD_COUNT_LIMIT atomic_set(&dev->dev_cmd_count, 0); #endif scst_init_mem_lim(&dev->dev_mem_lim); spin_lock_init(&dev->dev_lock); INIT_LIST_HEAD(&dev->dev_exec_cmd_list); INIT_LIST_HEAD(&dev->blocked_cmd_list); INIT_LIST_HEAD(&dev->dev_tgt_dev_list); INIT_LIST_HEAD(&dev->dev_acg_dev_list); INIT_LIST_HEAD(&dev->ext_blockers_list); #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) INIT_WORK(&dev->ext_blockers_work, scst_ext_blocking_done_fn, dev); #else INIT_WORK(&dev->ext_blockers_work, scst_ext_blocking_done_fn); #endif dev->dev_double_ua_possible = 1; dev->queue_alg = SCST_QUEUE_ALG_1_UNRESTRICTED_REORDER; dev->dev_numa_node_id = nodeid; scst_pr_init(dev); BUILD_BUG_ON(SCST_DIF_NO_CHECK_APP_TAG != 0); dev->dev_dif_static_app_tag = SCST_DIF_NO_CHECK_APP_TAG; dev->dev_dif_static_app_ref_tag = SCST_DIF_NO_CHECK_APP_TAG; dev->dev_dif_fn = scst_dif_none; scst_init_order_data(&dev->dev_order_data); scst_init_threads(&dev->dev_cmd_threads); *out_dev = dev; out: TRACE_EXIT_RES(res); return res; } void scst_free_device(struct scst_device *dev) { TRACE_ENTRY(); EXTRACHECKS_BUG_ON(dev->dev_scsi_atomic_cmd_active != 0); EXTRACHECKS_BUG_ON(!list_empty(&dev->dev_exec_cmd_list)); #ifdef CONFIG_SCST_EXTRACHECKS if (!list_empty(&dev->dev_tgt_dev_list) || !list_empty(&dev->dev_acg_dev_list)) { PRINT_CRIT_ERROR("%s: dev_tgt_dev_list or dev_acg_dev_list " "is not empty!", __func__); sBUG(); } #endif /* Ensure that ext_blockers_work is done */ flush_work(&dev->ext_blockers_work); scst_deinit_threads(&dev->dev_cmd_threads); scst_pr_cleanup(dev); kfree(dev->virt_name); kmem_cache_free(scst_dev_cachep, dev); TRACE_EXIT(); return; } bool scst_device_is_exported(struct scst_device *dev) { lockdep_assert_held(&scst_mutex); WARN_ON_ONCE(!dev->dev_tgt_dev_list.next); return !list_empty(&dev->dev_tgt_dev_list); } /** * scst_init_mem_lim - initialize memory limits structure * * Initializes memory limits structure mem_lim according to * the current system configuration. This structure should be latter used * to track and limit allocated by one or more SGV pools memory. */ void scst_init_mem_lim(struct scst_mem_lim *mem_lim) { atomic_set(&mem_lim->alloced_pages, 0); mem_lim->max_allowed_pages = ((uint64_t)scst_max_dev_cmd_mem << 10) >> (PAGE_SHIFT - 10); } EXPORT_SYMBOL_GPL(scst_init_mem_lim); static struct scst_acg_dev *scst_alloc_acg_dev(struct scst_acg *acg, struct scst_device *dev, uint64_t lun) { struct scst_acg_dev *res; TRACE_ENTRY(); res = kmem_cache_zalloc(scst_acgd_cachep, GFP_KERNEL); if (res == NULL) { PRINT_ERROR("%s", "Allocation of scst_acg_dev failed"); goto out; } res->dev = dev; res->acg = acg; res->lun = lun; out: TRACE_EXIT_HRES(res); return res; } /* * The activity supposed to be suspended and scst_mutex held or the * corresponding target supposed to be stopped. */ static void scst_del_acg_dev(struct scst_acg_dev *acg_dev, bool del_sysfs) { TRACE_DBG("Removing acg_dev %p from dev_acg_dev_list", acg_dev); list_del(&acg_dev->dev_acg_dev_list_entry); if (del_sysfs) scst_acg_dev_sysfs_del(acg_dev); } /* * The activity supposed to be suspended and scst_mutex held or the * corresponding target supposed to be stopped. */ static void scst_free_acg_dev(struct scst_acg_dev *acg_dev) { kmem_cache_free(scst_acgd_cachep, acg_dev); } /* * The activity supposed to be suspended and scst_mutex held or the * corresponding target supposed to be stopped. */ static void scst_del_free_acg_dev(struct scst_acg_dev *acg_dev, bool del_sysfs) { TRACE_ENTRY(); TRACE_DBG("Removing acg_dev %p from acg_dev_list", acg_dev); list_del(&acg_dev->acg_dev_list_entry); scst_del_acg_dev(acg_dev, del_sysfs); scst_free_acg_dev(acg_dev); TRACE_EXIT(); return; } static int scst_check_dif_compatibility(const struct scst_acg *acg, const struct scst_device *dev) { int res = -EINVAL; struct scst_tgt *tgt; const int *p; bool supported; TRACE_ENTRY(); if (dev->dev_dif_mode == SCST_DIF_MODE_NONE) goto out_ok; tgt = acg->tgt; if (!tgt->tgt_dif_supported) { PRINT_ERROR("Target %s doesn't support T10-PI (device %s)", tgt->tgt_name, dev->virt_name); goto out; } if (dev->dev_dif_mode & SCST_DIF_MODE_TGT) { if ((dev->dev_dif_type == 1) && !tgt->tgt_hw_dif_type1_supported) { PRINT_ERROR("Target %s doesn't support type 1 " "protection TGT mode (device %s)", tgt->tgt_name, dev->virt_name); goto out; } if ((dev->dev_dif_type == 2) && !tgt->tgt_hw_dif_type2_supported) { PRINT_ERROR("Target %s doesn't support type 2 " "protection TGT mode (device %s)", tgt->tgt_name, dev->virt_name); goto out; } if ((dev->dev_dif_type == 3) && !tgt->tgt_hw_dif_type3_supported) { PRINT_ERROR("Target %s doesn't support type 3 " "protection TGT mode (device %s)", tgt->tgt_name, dev->virt_name); goto out; } } if (tgt->tgt_supported_dif_block_sizes == NULL) goto out_ok; p = tgt->tgt_supported_dif_block_sizes; supported = false; while (*p != 0) { if (*p == dev->block_size) { supported = true; break; } p++; } if (!supported) { PRINT_ERROR("Target %s doesn't support block size %d of " "device %s", tgt->tgt_name, dev->block_size, dev->virt_name); goto out; } out_ok: res = 0; out: TRACE_EXIT_RES(res); return res; } /* The activity supposed to be suspended and scst_mutex held */ int scst_acg_add_lun(struct scst_acg *acg, struct kobject *parent, struct scst_device *dev, uint64_t lun, unsigned int flags, struct scst_acg_dev **out_acg_dev) { int res; struct scst_acg_dev *acg_dev; struct scst_tgt_dev *tgt_dev, *tt; struct scst_session *sess; LIST_HEAD(tmp_tgt_dev_list); TRACE_ENTRY(); INIT_LIST_HEAD(&tmp_tgt_dev_list); res = scst_check_dif_compatibility(acg, dev); if (res != 0) goto out; acg_dev = scst_alloc_acg_dev(acg, dev, lun); if (acg_dev == NULL) { res = -ENOMEM; goto out; } acg_dev->acg_dev_rd_only = ((flags & SCST_ADD_LUN_READ_ONLY) != 0); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_STORE) { /* Devices are allowed to store only CRCs */ acg_dev->acg_dev_dif_guard_format = SCST_DIF_GUARD_FORMAT_CRC; } else acg_dev->acg_dev_dif_guard_format = acg->tgt->tgt_hw_dif_ip_supported && !dev->dev_dif_ip_not_supported ? SCST_DIF_GUARD_FORMAT_IP : SCST_DIF_GUARD_FORMAT_CRC; TRACE_DBG("Adding acg_dev %p to acg_dev_list and dev_acg_dev_list", acg_dev); list_add_tail(&acg_dev->acg_dev_list_entry, &acg->acg_dev_list); list_add_tail(&acg_dev->dev_acg_dev_list_entry, &dev->dev_acg_dev_list); if (!(flags & SCST_ADD_LUN_CM)) { res = scst_cm_on_add_lun(acg_dev, lun, &flags); if (res != 0) goto out_free; } list_for_each_entry(sess, &acg->acg_sess_list, acg_sess_list_entry) { res = scst_alloc_add_tgt_dev(sess, acg_dev, &tgt_dev); if (res == -EPERM) continue; else if (res != 0) goto out_free; list_add_tail(&tgt_dev->extra_tgt_dev_list_entry, &tmp_tgt_dev_list); } res = scst_acg_dev_sysfs_create(acg_dev, parent); if (res != 0) goto out_on_del; if (flags & SCST_ADD_LUN_GEN_UA) scst_report_luns_changed(acg); PRINT_INFO("Added device %s to group %s (LUN %lld, " "flags 0x%x) to target %s", dev->virt_name, acg->acg_name, lun, flags, acg->tgt ? acg->tgt->tgt_name : "?"); if (out_acg_dev != NULL) *out_acg_dev = acg_dev; out: TRACE_EXIT_RES(res); return res; out_on_del: if (!(flags & SCST_ADD_LUN_CM)) scst_cm_on_del_lun(acg_dev, false); out_free: list_for_each_entry_safe(tgt_dev, tt, &tmp_tgt_dev_list, extra_tgt_dev_list_entry) { scst_free_tgt_dev(tgt_dev); } scst_del_free_acg_dev(acg_dev, false); goto out; } /* Delete a LUN without generating a unit attention. */ static struct scst_acg_dev *__scst_acg_del_lun(struct scst_acg *acg, uint64_t lun, bool *report_luns_changed) { struct scst_acg_dev *acg_dev = NULL, *a; struct scst_tgt_dev *tgt_dev, *tt; scst_assert_activity_suspended(); lockdep_assert_held(&scst_mutex); list_for_each_entry(a, &acg->acg_dev_list, acg_dev_list_entry) { if (a->lun == lun) { acg_dev = a; break; } } if (acg_dev == NULL) goto out; *report_luns_changed = scst_cm_on_del_lun(acg_dev, *report_luns_changed); list_for_each_entry_safe(tgt_dev, tt, &acg_dev->dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { if (tgt_dev->acg_dev == acg_dev) scst_free_tgt_dev(tgt_dev); } scst_del_free_acg_dev(acg_dev, true); PRINT_INFO("Removed LUN %lld from group %s (target %s)", lun, acg->acg_name, acg->tgt ? acg->tgt->tgt_name : "?"); out: return acg_dev; } /* * Delete a LUN and generate a unit attention if gen_report_luns_changed is * true. */ int scst_acg_del_lun(struct scst_acg *acg, uint64_t lun, bool gen_report_luns_changed) { int res = 0; struct scst_acg_dev *acg_dev; TRACE_ENTRY(); scst_assert_activity_suspended(); lockdep_assert_held(&scst_mutex); acg_dev = __scst_acg_del_lun(acg, lun, &gen_report_luns_changed); if (acg_dev == NULL) { PRINT_ERROR("Device is not found in group %s", acg->acg_name); res = -EINVAL; goto out; } if (gen_report_luns_changed) scst_report_luns_changed(acg); out: TRACE_EXIT_RES(res); return res; } /* Either add or replace a LUN according to flags argument */ int scst_acg_repl_lun(struct scst_acg *acg, struct kobject *parent, struct scst_device *dev, uint64_t lun, unsigned int flags) { struct scst_acg_dev *acg_dev; bool del_gen_ua = false; int res = -EINVAL; scst_assert_activity_suspended(); lockdep_assert_held(&scst_mutex); acg_dev = __scst_acg_del_lun(acg, lun, &del_gen_ua); if (!acg_dev) flags |= SCST_ADD_LUN_GEN_UA; res = scst_acg_add_lun(acg, parent, dev, lun, flags, NULL); if (res != 0) goto out; if (acg_dev && (flags & SCST_REPL_LUN_GEN_UA)) { struct scst_tgt_dev *tgt_dev; list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { if (tgt_dev->acg_dev->acg == acg && tgt_dev->lun == lun) { TRACE_MGMT_DBG("INQUIRY DATA HAS CHANGED" " on tgt_dev %p", tgt_dev); scst_gen_aen_or_ua(tgt_dev, SCST_LOAD_SENSE(scst_sense_inquiry_data_changed)); } } } out: return res; } int scst_alloc_add_acg(struct scst_tgt *tgt, const char *acg_name, bool tgt_acg, struct scst_acg **out_acg) { struct scst_acg *acg; int res; TRACE_ENTRY(); lockdep_assert_held(&scst_mutex); acg = kzalloc(sizeof(*acg), GFP_KERNEL); if (acg == NULL) { PRINT_ERROR("%s", "Allocation of acg failed"); res = -ENOMEM; goto out; } kref_init(&acg->acg_kref); acg->tgt = tgt; INIT_LIST_HEAD(&acg->acg_dev_list); INIT_LIST_HEAD(&acg->acg_sess_list); INIT_LIST_HEAD(&acg->acn_list); cpumask_copy(&acg->acg_cpu_mask, &default_cpu_mask); acg->acg_name = kstrdup(acg_name, GFP_KERNEL); if (acg->acg_name == NULL) { PRINT_ERROR("%s", "Allocation of acg_name failed"); res = -ENOMEM; goto out_free; } res = scst_cm_on_add_acg(acg); if (res != 0) goto out_undup; #ifdef CONFIG_SCST_PROC acg->addr_method = tgt && tgt->tgtt ? tgt->tgtt->preferred_addr_method : SCST_LUN_ADDR_METHOD_PERIPHERAL; TRACE_DBG("Adding acg %s to scst_acg_list", acg_name); list_add_tail(&acg->acg_list_entry, &scst_acg_list); scst_check_reassign_sessions(); #else acg->addr_method = tgt->tgtt->preferred_addr_method; if (tgt_acg) { TRACE_DBG("Adding acg '%s' to device '%s' acg_list", acg_name, tgt->tgt_name); list_add_tail(&acg->acg_list_entry, &tgt->tgt_acg_list); acg->tgt_acg = 1; res = scst_acg_sysfs_create(tgt, acg); if (res != 0) goto out_del; } kobject_get(&tgt->tgt_kobj); #endif res = 0; out: *out_acg = acg; TRACE_EXIT_RES(res); return res; #ifndef CONFIG_SCST_PROC out_del: list_del(&acg->acg_list_entry); #endif out_undup: kfree(acg->acg_name); out_free: kfree(acg); acg = NULL; goto out; } /** * scst_del_acg - delete an ACG from the per-target ACG list and from sysfs * * The caller must hold scst_mutex and activity must have been suspended. * * Note: It is the responsibility of the caller to make sure that * scst_put_acg() gets invoked. */ static void scst_del_acg(struct scst_acg *acg) { struct scst_acn *acn; struct scst_acg_dev *acg_dev, *acg_dev_tmp; scst_assert_activity_suspended(); lockdep_assert_held(&scst_mutex); scst_cm_on_del_acg(acg); list_for_each_entry_safe(acg_dev, acg_dev_tmp, &acg->acg_dev_list, acg_dev_list_entry) scst_del_acg_dev(acg_dev, true); list_for_each_entry(acn, &acg->acn_list, acn_list_entry) scst_acn_sysfs_del(acn); #ifdef CONFIG_SCST_PROC list_del(&acg->acg_list_entry); #else if (acg->tgt_acg) { TRACE_DBG("Removing acg %s from list", acg->acg_name); list_del(&acg->acg_list_entry); scst_acg_sysfs_del(acg); } else { acg->tgt->default_acg = NULL; } #endif } /** * scst_free_acg - free an ACG * * The caller must hold scst_mutex and activity must have been suspended. */ static void scst_free_acg(struct scst_acg *acg) { struct scst_acg_dev *acg_dev, *acg_dev_tmp; struct scst_acn *acn, *acnt; struct scst_tgt *tgt = acg->tgt; /* For procfs acg->tgt could be NULL */ TRACE_DBG("Freeing acg %s/%s", tgt ? tgt->tgt_name : "(tgt=NULL)", acg->acg_name); list_for_each_entry_safe(acg_dev, acg_dev_tmp, &acg->acg_dev_list, acg_dev_list_entry) { struct scst_tgt_dev *tgt_dev, *tt; list_for_each_entry_safe(tgt_dev, tt, &acg_dev->dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { if (tgt_dev->acg_dev == acg_dev) scst_free_tgt_dev(tgt_dev); } scst_free_acg_dev(acg_dev); } list_for_each_entry_safe(acn, acnt, &acg->acn_list, acn_list_entry) { scst_free_acn(acn, list_is_last(&acn->acn_list_entry, &acg->acn_list)); } kfree(acg->acg_name); kfree(acg); #ifndef CONFIG_SCST_PROC kobject_put(&tgt->tgt_kobj); #endif } static void scst_release_acg(struct kref *kref) { struct scst_acg *acg = container_of(kref, struct scst_acg, acg_kref); scst_free_acg(acg); } struct scst_acg_put_work { struct work_struct work; struct scst_acg *acg; }; #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) static void scst_put_acg_work(void *p) { struct scst_acg_put_work *put_work = p; #else static void scst_put_acg_work(struct work_struct *work) { struct scst_acg_put_work *put_work = container_of(work, typeof(*put_work), work); #endif struct scst_acg *acg = put_work->acg; kfree(put_work); kref_put(&acg->acg_kref, scst_release_acg); } void scst_put_acg(struct scst_acg *acg) { struct scst_acg_put_work *put_work; bool rc; put_work = kmalloc(sizeof(*put_work), GFP_KERNEL | __GFP_NOFAIL); if (WARN_ON_ONCE(!put_work)) { kref_put(&acg->acg_kref, scst_release_acg); return; } #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) INIT_WORK(&put_work->work, scst_put_acg_work, put_work); #else INIT_WORK(&put_work->work, scst_put_acg_work); #endif put_work->acg = acg; /* * Schedule the kref_put() call instead of invoking it directly to * avoid deep recursion and a stack overflow. */ rc = queue_work(scst_release_acg_wq, &put_work->work); WARN_ON_ONCE(!rc); return; } void scst_get_acg(struct scst_acg *acg) { kref_get(&acg->acg_kref); } /** * scst_close_del_free_acg - close sessions, delete and free an ACG * * The caller must hold scst_mutex and activity must have been suspended. * * Note: deleting and freeing the ACG happens asynchronously. Each time a * session is closed the ACG reference count is decremented, and if that * reference count drops to zero the ACG is freed. */ int scst_del_free_acg(struct scst_acg *acg, bool close_sessions) { struct scst_tgt *tgt = acg->tgt; struct scst_session *sess, *sess_tmp; scst_assert_activity_suspended(); lockdep_assert_held(&scst_mutex); if ((!close_sessions && !list_empty(&acg->acg_sess_list)) || (close_sessions && !tgt->tgtt->close_session)) return -EBUSY; scst_del_acg(acg); if (close_sessions) { TRACE_DBG("Closing sessions for group %s/%s", tgt->tgt_name, acg->acg_name); list_for_each_entry_safe(sess, sess_tmp, &acg->acg_sess_list, acg_sess_list_entry) { TRACE_DBG("Closing session %s/%s/%s", tgt->tgt_name, acg->acg_name, sess->initiator_name); tgt->tgtt->close_session(sess); } } scst_put_acg(acg); return 0; } #ifndef CONFIG_SCST_PROC /* The activity supposed to be suspended and scst_mutex held */ struct scst_acg *scst_tgt_find_acg(struct scst_tgt *tgt, const char *name) { struct scst_acg *acg, *acg_ret = NULL; TRACE_ENTRY(); list_for_each_entry(acg, &tgt->tgt_acg_list, acg_list_entry) { if (strcmp(acg->acg_name, name) == 0) { acg_ret = acg; break; } } TRACE_EXIT(); return acg_ret; } #endif /* scst_mutex supposed to be held */ static struct scst_tgt_dev *scst_find_shared_io_tgt_dev( struct scst_tgt_dev *tgt_dev) { struct scst_cmd_threads *a; struct scst_tgt_dev *res = NULL; struct scst_session *sess = tgt_dev->sess; struct scst_acg *acg = tgt_dev->acg_dev->acg; struct scst_tgt_dev *t; TRACE_ENTRY(); TRACE_DBG("tgt_dev %s (acg %p, io_grouping_type %d)", sess->initiator_name, acg, acg->acg_io_grouping_type); switch (acg->acg_io_grouping_type) { case SCST_IO_GROUPING_AUTO: if (sess->initiator_name == NULL) goto out; list_for_each_entry(t, &tgt_dev->dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { if ((t == tgt_dev) || (t->sess->initiator_name == NULL) || (t->active_cmd_threads == NULL)) continue; TRACE_DBG("t %s", t->sess->initiator_name); /* We check other ACG's as well */ if (strcmp(t->sess->initiator_name, sess->initiator_name) == 0) goto found; } break; case SCST_IO_GROUPING_THIS_GROUP_ONLY: list_for_each_entry(t, &tgt_dev->dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { if ((t == tgt_dev) || (t->active_cmd_threads == NULL)) continue; TRACE_DBG("t %s (acg %p)", t->sess->initiator_name, t->acg_dev->acg); if (t->acg_dev->acg == acg) goto found; } break; case SCST_IO_GROUPING_NEVER: goto out; default: list_for_each_entry(t, &tgt_dev->dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { if ((t == tgt_dev) || (t->active_cmd_threads == NULL)) continue; TRACE_DBG("t %s (acg %p, io_grouping_type %d)", t->sess->initiator_name, t->acg_dev->acg, t->acg_dev->acg->acg_io_grouping_type); if (t->acg_dev->acg->acg_io_grouping_type == acg->acg_io_grouping_type) goto found; } break; } out: TRACE_EXIT_HRES((unsigned long)res); return res; found: res = t; a = t->active_cmd_threads; if (a == &scst_main_cmd_threads) { TRACE_DBG("Going to share async IO context %p (res %p, " "ini %s, dev %s, grouping type %d)", t->aic_keeper->aic, res, t->sess->initiator_name, t->dev->virt_name, t->acg_dev->acg->acg_io_grouping_type); } else { wait_event(a->ioctx_wq, a->io_context_ready); smp_rmb(); TRACE_DBG("Going to share IO context %p (res %p, ini %s, " "dev %s, cmd_threads %p, grouping type %d)", res->active_cmd_threads->io_context, res, t->sess->initiator_name, t->dev->virt_name, t->active_cmd_threads, t->acg_dev->acg->acg_io_grouping_type); } goto out; } enum scst_dev_type_threads_pool_type scst_parse_threads_pool_type(const char *p, int len) { enum scst_dev_type_threads_pool_type res; if (strncasecmp(p, SCST_THREADS_POOL_PER_INITIATOR_STR, min_t(int, strlen(SCST_THREADS_POOL_PER_INITIATOR_STR), len)) == 0) res = SCST_THREADS_POOL_PER_INITIATOR; else if (strncasecmp(p, SCST_THREADS_POOL_SHARED_STR, min_t(int, strlen(SCST_THREADS_POOL_SHARED_STR), len)) == 0) res = SCST_THREADS_POOL_SHARED; else { PRINT_ERROR("Unknown threads pool type %s", p); res = SCST_THREADS_POOL_TYPE_INVALID; } return res; } static int scst_ioc_keeper_thread(void *arg) { struct scst_async_io_context_keeper *aic_keeper = (struct scst_async_io_context_keeper *)arg; TRACE_ENTRY(); TRACE_MGMT_DBG("AIC %p keeper thread %s started", aic_keeper, current->comm); current->flags |= PF_NOFREEZE; sBUG_ON(aic_keeper->aic != NULL); #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0) aic_keeper->aic = get_task_io_context(current, GFP_KERNEL, NUMA_NO_NODE); #else aic_keeper->aic = get_io_context(GFP_KERNEL, -1); #endif #endif TRACE_DBG("Alloced new async IO context %p (aic %p)", aic_keeper->aic, aic_keeper); /* We have our own ref counting */ put_io_context(aic_keeper->aic); /* We are ready */ aic_keeper->aic_ready = true; wake_up_all(&aic_keeper->aic_keeper_waitQ); wait_event_interruptible(aic_keeper->aic_keeper_waitQ, kthread_should_stop()); TRACE_MGMT_DBG("AIC %p keeper thread %s finished", aic_keeper, current->comm); TRACE_EXIT(); return 0; } /* scst_mutex supposed to be held */ int scst_tgt_dev_setup_threads(struct scst_tgt_dev *tgt_dev) { int res = 0; struct scst_session *sess = tgt_dev->sess; struct scst_tgt_template *tgtt = sess->tgt->tgtt; struct scst_device *dev = tgt_dev->dev; struct scst_async_io_context_keeper *aic_keeper; TRACE_ENTRY(); tgt_dev->thread_index = -1; if (dev->threads_num < 0) goto out; if (dev->threads_num == 0) { struct scst_tgt_dev *shared_io_tgt_dev; tgt_dev->active_cmd_threads = &scst_main_cmd_threads; shared_io_tgt_dev = scst_find_shared_io_tgt_dev(tgt_dev); if (shared_io_tgt_dev != NULL) { aic_keeper = shared_io_tgt_dev->aic_keeper; kref_get(&aic_keeper->aic_keeper_kref); TRACE_DBG("Linking async io context %p " "for shared tgt_dev %p (dev %s)", aic_keeper->aic, tgt_dev, tgt_dev->dev->virt_name); } else { /* Create new context */ aic_keeper = kzalloc_node(sizeof(*aic_keeper), GFP_KERNEL, dev->dev_numa_node_id); if (aic_keeper == NULL) { PRINT_ERROR("Unable to alloc aic_keeper " "(size %zd)", sizeof(*aic_keeper)); res = -ENOMEM; goto out; } kref_init(&aic_keeper->aic_keeper_kref); init_waitqueue_head(&aic_keeper->aic_keeper_waitQ); aic_keeper->aic_keeper_thr = kthread_run(scst_ioc_keeper_thread, aic_keeper, "aic_keeper"); if (IS_ERR(aic_keeper->aic_keeper_thr)) { PRINT_ERROR("Error running ioc_keeper " "thread (tgt_dev %p)", tgt_dev); res = PTR_ERR(aic_keeper->aic_keeper_thr); goto out_free_keeper; } wait_event(aic_keeper->aic_keeper_waitQ, aic_keeper->aic_ready); TRACE_DBG("Created async io context %p " "for not shared tgt_dev %p (dev %s)", aic_keeper->aic, tgt_dev, tgt_dev->dev->virt_name); } tgt_dev->async_io_context = aic_keeper->aic; tgt_dev->aic_keeper = aic_keeper; res = scst_add_threads(tgt_dev->active_cmd_threads, NULL, NULL, tgtt->threads_num); goto out; } switch (dev->threads_pool_type) { case SCST_THREADS_POOL_PER_INITIATOR: { struct scst_tgt_dev *shared_io_tgt_dev; scst_init_threads(&tgt_dev->tgt_dev_cmd_threads); tgt_dev->active_cmd_threads = &tgt_dev->tgt_dev_cmd_threads; shared_io_tgt_dev = scst_find_shared_io_tgt_dev(tgt_dev); if (shared_io_tgt_dev != NULL) { TRACE_DBG("Linking io context %p for " "shared tgt_dev %p (cmd_threads %p)", shared_io_tgt_dev->active_cmd_threads->io_context, tgt_dev, tgt_dev->active_cmd_threads); /* It's ref counted via threads */ tgt_dev->active_cmd_threads->io_context = shared_io_tgt_dev->active_cmd_threads->io_context; } res = scst_add_threads(tgt_dev->active_cmd_threads, NULL, tgt_dev, dev->threads_num + tgtt->threads_num); if (res != 0) { /* Let's clear here, because no threads could be run */ tgt_dev->active_cmd_threads->io_context = NULL; } break; } case SCST_THREADS_POOL_SHARED: { tgt_dev->active_cmd_threads = &dev->dev_cmd_threads; res = scst_add_threads(tgt_dev->active_cmd_threads, dev, NULL, tgtt->threads_num); break; } case SCST_THREADS_POOL_TYPE_INVALID: default: PRINT_CRIT_ERROR("Unknown threads pool type %d (dev %s)", dev->threads_pool_type, dev->virt_name); sBUG(); break; } out: if (res == 0) tm_dbg_init_tgt_dev(tgt_dev); TRACE_EXIT_RES(res); return res; out_free_keeper: kfree(aic_keeper); goto out; } static void scst_aic_keeper_release(struct kref *kref) { struct scst_async_io_context_keeper *aic_keeper; TRACE_ENTRY(); aic_keeper = container_of(kref, struct scst_async_io_context_keeper, aic_keeper_kref); kthread_stop(aic_keeper->aic_keeper_thr); kfree(aic_keeper); TRACE_EXIT(); return; } /* scst_mutex supposed to be held */ void scst_tgt_dev_stop_threads(struct scst_tgt_dev *tgt_dev) { struct scst_tgt_template *tgtt = tgt_dev->sess->tgt->tgtt; TRACE_ENTRY(); if (tgt_dev->dev->threads_num < 0) goto out_deinit; if (tgt_dev->active_cmd_threads == &scst_main_cmd_threads) { /* Global async threads */ kref_put(&tgt_dev->aic_keeper->aic_keeper_kref, scst_aic_keeper_release); tgt_dev->async_io_context = NULL; tgt_dev->aic_keeper = NULL; } else if (tgt_dev->active_cmd_threads == &tgt_dev->dev->dev_cmd_threads) { /* Per device shared threads */ scst_del_threads(tgt_dev->active_cmd_threads, tgtt->threads_num); } else if (tgt_dev->active_cmd_threads == &tgt_dev->tgt_dev_cmd_threads) { /* Per tgt_dev threads */ scst_del_threads(tgt_dev->active_cmd_threads, -1); scst_deinit_threads(&tgt_dev->tgt_dev_cmd_threads); } /* else no threads (not yet initialized, e.g.) */ out_deinit: tm_dbg_deinit_tgt_dev(tgt_dev); tgt_dev->active_cmd_threads = NULL; TRACE_EXIT(); return; } static __be16 scst_dif_crc_fn(const void *data, unsigned int len); static __be16 scst_dif_ip_fn(const void *data, unsigned int len); /* * scst_mutex supposed to be held, there must not be parallel activity in this * session. May be invoked from inside scst_check_reassign_sessions() which * means that sess->acg can be NULL. */ static int scst_alloc_add_tgt_dev(struct scst_session *sess, struct scst_acg_dev *acg_dev, struct scst_tgt_dev **out_tgt_dev) { int res = 0; struct scst_tgt_template *tgtt = sess->tgt->tgtt; int ini_sg, ini_unchecked_isa_dma, ini_use_clustering; struct scst_tgt_dev *tgt_dev; struct scst_device *dev = acg_dev->dev; struct list_head *head; int sl; uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN]; TRACE_ENTRY(); tgt_dev = kmem_cache_zalloc(scst_tgtd_cachep, GFP_KERNEL); if (tgt_dev == NULL) { PRINT_ERROR("%s", "Allocation of scst_tgt_dev failed"); res = -ENOMEM; goto out; } tgt_dev->dev = dev; tgt_dev->lun = acg_dev->lun; tgt_dev->acg_dev = acg_dev; tgt_dev->tgt_dev_rd_only = acg_dev->acg_dev_rd_only || dev->dev_rd_only; if (sess->tgt->tgt_forwarding) set_bit(SCST_TGT_DEV_FORWARDING, &tgt_dev->tgt_dev_flags); else clear_bit(SCST_TGT_DEV_FORWARDING, &tgt_dev->tgt_dev_flags); tgt_dev->hw_dif_same_sg_layout_required = sess->tgt->tgt_hw_dif_same_sg_layout_required; tgt_dev->tgt_dev_dif_guard_format = acg_dev->acg_dev_dif_guard_format; if (tgt_dev->tgt_dev_dif_guard_format == SCST_DIF_GUARD_FORMAT_IP) tgt_dev->tgt_dev_dif_crc_fn = scst_dif_ip_fn; else { EXTRACHECKS_BUG_ON(tgt_dev->tgt_dev_dif_guard_format != SCST_DIF_GUARD_FORMAT_CRC); tgt_dev->tgt_dev_dif_crc_fn = scst_dif_crc_fn; } atomic_set(&tgt_dev->tgt_dev_dif_app_failed_tgt, 0); atomic_set(&tgt_dev->tgt_dev_dif_ref_failed_tgt, 0); atomic_set(&tgt_dev->tgt_dev_dif_guard_failed_tgt, 0); atomic_set(&tgt_dev->tgt_dev_dif_app_failed_scst, 0); atomic_set(&tgt_dev->tgt_dev_dif_ref_failed_scst, 0); atomic_set(&tgt_dev->tgt_dev_dif_guard_failed_scst, 0); atomic_set(&tgt_dev->tgt_dev_dif_app_failed_dev, 0); atomic_set(&tgt_dev->tgt_dev_dif_ref_failed_dev, 0); atomic_set(&tgt_dev->tgt_dev_dif_guard_failed_dev, 0); tgt_dev->sess = sess; atomic_set(&tgt_dev->tgt_dev_cmd_count, 0); if (acg_dev->acg->acg_black_hole_type != SCST_ACG_BLACK_HOLE_NONE) set_bit(SCST_TGT_DEV_BLACK_HOLE, &tgt_dev->tgt_dev_flags); else clear_bit(SCST_TGT_DEV_BLACK_HOLE, &tgt_dev->tgt_dev_flags); #ifdef CONFIG_CPUMASK_OFFSTACK tgt_dev->pools = kzalloc_node(sizeof(tgt_dev->pools[0])*NR_CPUS, GFP_KERNEL, dev->dev_numa_node_id); if (tgt_dev->pools == NULL) { PRINT_ERROR("Unable to alloc tgt_dev->pools (size %zd)", sizeof(tgt_dev->pools[0])*NR_CPUS); goto out_free; } #endif scst_sgv_pool_use_norm(tgt_dev); if (dev->scsi_dev != NULL) { ini_sg = dev->scsi_dev->host->sg_tablesize; ini_unchecked_isa_dma = dev->scsi_dev->host->unchecked_isa_dma; ini_use_clustering = (dev->scsi_dev->host->use_clustering == ENABLE_CLUSTERING); } else { ini_sg = (1 << 15) /* infinite */; ini_unchecked_isa_dma = 0; ini_use_clustering = 0; } tgt_dev->max_sg_cnt = min(ini_sg, sess->tgt->sg_tablesize); if ((sess->tgt->tgtt->use_clustering || ini_use_clustering) && !sess->tgt->tgtt->no_clustering && !(sess->tgt->tgt_hw_dif_same_sg_layout_required && (tgt_dev->dev->dev_dif_type != 0))) scst_sgv_pool_use_norm_clust(tgt_dev); if (sess->tgt->tgtt->unchecked_isa_dma || ini_unchecked_isa_dma) scst_sgv_pool_use_dma(tgt_dev); TRACE_MGMT_DBG("Device %s on SCST lun=%lld", dev->virt_name, (unsigned long long int)tgt_dev->lun); spin_lock_init(&tgt_dev->tgt_dev_lock); INIT_LIST_HEAD(&tgt_dev->UA_list); scst_init_order_data(&tgt_dev->tgt_dev_order_data); if (dev->tst == SCST_TST_1_SEP_TASK_SETS) tgt_dev->curr_order_data = &tgt_dev->tgt_dev_order_data; else tgt_dev->curr_order_data = &dev->dev_order_data; if (dev->handler->parse_atomic && dev->handler->dev_alloc_data_buf_atomic && (sess->tgt->tgtt->preprocessing_done == NULL)) { if (sess->tgt->tgtt->rdy_to_xfer_atomic) tgt_dev->tgt_dev_after_init_wr_atomic = 1; } if (dev->handler->dev_done_atomic && sess->tgt->tgtt->xmit_response_atomic) tgt_dev->tgt_dev_after_exec_atomic = 1; sl = scst_set_sense(sense_buffer, sizeof(sense_buffer), dev->d_sense, SCST_LOAD_SENSE(scst_sense_reset_UA)); scst_alloc_set_UA(tgt_dev, sense_buffer, sl, 0); if (sess->tgt->tgtt->get_initiator_port_transport_id == NULL) { if (!list_empty(&dev->dev_registrants_list)) { PRINT_WARNING("Initiators from target %s can't connect " "to device %s, because the device has PR " "registrants and the target doesn't support " "Persistent Reservations", sess->tgt->tgtt->name, dev->virt_name); res = -EPERM; goto out_free_ua; } dev->not_pr_supporting_tgt_devs_num++; } res = scst_pr_init_tgt_dev(tgt_dev); if (res != 0) goto out_dec_free; res = scst_tgt_dev_setup_threads(tgt_dev); if (res != 0) goto out_pr_clear; if (dev->handler->attach_tgt) { TRACE_DBG("Calling dev handler's attach_tgt(%p)", tgt_dev); res = dev->handler->attach_tgt(tgt_dev); TRACE_DBG("%s", "Dev handler's attach_tgt() returned"); if (res != 0) { PRINT_ERROR("Device handler's %s attach_tgt() " "failed: %d", dev->handler->name, res); goto out_stop_threads; } } res = scst_tgt_dev_sysfs_create(tgt_dev); if (res != 0) goto out_detach; spin_lock_bh(&dev->dev_lock); list_add_tail(&tgt_dev->dev_tgt_dev_list_entry, &dev->dev_tgt_dev_list); spin_unlock_bh(&dev->dev_lock); head = &sess->sess_tgt_dev_list[SESS_TGT_DEV_LIST_HASH_FN(tgt_dev->lun)]; list_add_tail(&tgt_dev->sess_tgt_dev_list_entry, head); scst_tg_init_tgt_dev(tgt_dev); *out_tgt_dev = tgt_dev; out: TRACE_EXIT_RES(res); return res; out_detach: if (dev->handler->detach_tgt) { TRACE_DBG("Calling dev handler's detach_tgt(%p)", tgt_dev); dev->handler->detach_tgt(tgt_dev); TRACE_DBG("%s", "Dev handler's detach_tgt() returned"); } out_stop_threads: scst_tgt_dev_stop_threads(tgt_dev); out_pr_clear: scst_pr_clear_tgt_dev(tgt_dev); out_dec_free: if (tgtt->get_initiator_port_transport_id == NULL) dev->not_pr_supporting_tgt_devs_num--; out_free_ua: scst_free_all_UA(tgt_dev); #ifdef CONFIG_CPUMASK_OFFSTACK kfree(tgt_dev->pools); out_free: #endif kmem_cache_free(scst_tgtd_cachep, tgt_dev); goto out; } /* scst_mutex supposed to be held */ void scst_nexus_loss(struct scst_tgt_dev *tgt_dev, bool queue_UA) { TRACE_ENTRY(); if (queue_UA) { uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN]; int sl = scst_set_sense(sense_buffer, sizeof(sense_buffer), tgt_dev->dev->d_sense, SCST_LOAD_SENSE(scst_sense_nexus_loss_UA)); scst_check_set_UA(tgt_dev, sense_buffer, sl, SCST_SET_UA_FLAG_AT_HEAD); } TRACE_EXIT(); return; } /* * scst_mutex supposed to be held, there must not be parallel activity in this * session. */ static void scst_free_tgt_dev(struct scst_tgt_dev *tgt_dev) { struct scst_tgt_template *tgtt = tgt_dev->sess->tgt->tgtt; struct scst_device *dev = tgt_dev->dev; TRACE_ENTRY(); spin_lock_bh(&dev->dev_lock); list_del(&tgt_dev->dev_tgt_dev_list_entry); spin_unlock_bh(&dev->dev_lock); list_del(&tgt_dev->sess_tgt_dev_list_entry); scst_tgt_dev_sysfs_del(tgt_dev); if (tgtt->get_initiator_port_transport_id == NULL) dev->not_pr_supporting_tgt_devs_num--; scst_clear_reservation(tgt_dev); scst_pr_clear_tgt_dev(tgt_dev); scst_free_all_UA(tgt_dev); if (dev->handler && dev->handler->detach_tgt) { TRACE_DBG("Calling dev handler's detach_tgt(%p)", tgt_dev); dev->handler->detach_tgt(tgt_dev); TRACE_DBG("%s", "Dev handler's detach_tgt() returned"); } scst_tgt_dev_stop_threads(tgt_dev); #ifdef CONFIG_CPUMASK_OFFSTACK kfree(tgt_dev->pools); #endif kmem_cache_free(scst_tgtd_cachep, tgt_dev); TRACE_EXIT(); return; } /* scst_mutex supposed to be held */ int scst_sess_alloc_tgt_devs(struct scst_session *sess) { int res = 0; struct scst_acg_dev *acg_dev; struct scst_tgt_dev *tgt_dev; TRACE_ENTRY(); list_for_each_entry(acg_dev, &sess->acg->acg_dev_list, acg_dev_list_entry) { res = scst_alloc_add_tgt_dev(sess, acg_dev, &tgt_dev); if (res == -EPERM) continue; else if (res != 0) goto out_free; } out: TRACE_EXIT(); return res; out_free: scst_sess_free_tgt_devs(sess); goto out; } /* * scst_mutex supposed to be held, there must not be parallel activity in this * session. */ void scst_sess_free_tgt_devs(struct scst_session *sess) { int i; struct scst_tgt_dev *tgt_dev, *t; TRACE_ENTRY(); /* The session is going down, no users, so no locks */ for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { struct list_head *head = &sess->sess_tgt_dev_list[i]; list_for_each_entry_safe(tgt_dev, t, head, sess_tgt_dev_list_entry) { scst_free_tgt_dev(tgt_dev); } INIT_LIST_HEAD(head); } TRACE_EXIT(); return; } /* The activity supposed to be suspended and scst_mutex held */ int scst_acg_add_acn(struct scst_acg *acg, const char *name) { int res = 0; struct scst_acn *acn; char *nm; TRACE_ENTRY(); list_for_each_entry(acn, &acg->acn_list, acn_list_entry) { if (strcmp(acn->name, name) == 0) { PRINT_ERROR("Name %s already exists in group %s", name, acg->acg_name); res = -EEXIST; goto out; } } acn = kzalloc(sizeof(*acn), GFP_KERNEL); if (acn == NULL) { PRINT_ERROR("%s", "Unable to allocate scst_acn"); res = -ENOMEM; goto out; } acn->acg = acg; nm = kstrdup(name, GFP_KERNEL); if (nm == NULL) { PRINT_ERROR("%s", "Unable to allocate scst_acn->name"); res = -ENOMEM; goto out_free; } acn->name = nm; res = scst_acn_sysfs_create(acn); if (res != 0) goto out_free_nm; list_add_tail(&acn->acn_list_entry, &acg->acn_list); out: if (res == 0) { PRINT_INFO("Added name %s to group %s (target %s)", name, acg->acg_name, acg->tgt ? acg->tgt->tgt_name : "?"); scst_check_reassign_sessions(); } TRACE_EXIT_RES(res); return res; out_free_nm: kfree(nm); out_free: kfree(acn); goto out; } /* The activity supposed to be suspended and scst_mutex held */ static void scst_free_acn(struct scst_acn *acn, bool reassign) { kfree(acn->name); kfree(acn); if (reassign) scst_check_reassign_sessions(); } /* The activity supposed to be suspended and scst_mutex held */ void scst_del_free_acn(struct scst_acn *acn, bool reassign) { TRACE_ENTRY(); list_del(&acn->acn_list_entry); scst_acn_sysfs_del(acn); scst_free_acn(acn, reassign); TRACE_EXIT(); return; } /* The activity supposed to be suspended and scst_mutex held */ struct scst_acn *scst_find_acn(struct scst_acg *acg, const char *name) { struct scst_acn *acn; TRACE_ENTRY(); TRACE_DBG("Trying to find name '%s'", name); list_for_each_entry(acn, &acg->acn_list, acn_list_entry) { if (strcmp(acn->name, name) == 0) { TRACE_DBG("%s", "Found"); goto out; } } acn = NULL; out: TRACE_EXIT(); return acn; } #ifdef CONFIG_SCST_PROC /* The activity supposed to be suspended and scst_mutex held */ int scst_acg_remove_name(struct scst_acg *acg, const char *name, bool reassign) { int res = -EINVAL; struct scst_acn *acn; TRACE_ENTRY(); list_for_each_entry(acn, &acg->acn_list, acn_list_entry) { if (strcmp(acn->name, name) == 0) { scst_del_free_acn(acn, false); res = 0; break; } } if (res == 0) { PRINT_INFO("Removed name %s from group %s (target %s)", name, acg->acg_name, acg->tgt ? acg->tgt->tgt_name : "?"); if (reassign) scst_check_reassign_sessions(); } else PRINT_ERROR("Unable to find name '%s' in group '%s'", name, acg->acg_name); TRACE_EXIT_RES(res); return res; } #endif struct scst_cmd *__scst_create_prepare_internal_cmd(const uint8_t *cdb, unsigned int cdb_len, enum scst_cmd_queue_type queue_type, struct scst_tgt_dev *tgt_dev, gfp_t gfp_mask, bool fantom) { struct scst_cmd *res; int rc; unsigned long flags; TRACE_ENTRY(); res = scst_alloc_cmd(cdb, cdb_len, gfp_mask); if (res == NULL) goto out; res->cmd_threads = tgt_dev->active_cmd_threads; res->sess = tgt_dev->sess; res->internal = 1; res->tgtt = tgt_dev->sess->tgt->tgtt; res->tgt = tgt_dev->sess->tgt; res->dev = tgt_dev->dev; res->devt = tgt_dev->dev->handler; res->tgt_dev = tgt_dev; res->cur_order_data = tgt_dev->curr_order_data; res->lun = tgt_dev->lun; res->queue_type = queue_type; res->data_direction = SCST_DATA_UNKNOWN; if (!fantom) { /* * We need to keep it here to be able to abort during TM * processing. They should be aborted to (1) speed up TM * processing and (2) to guarantee that after a TM command * finished the affected device(s) is/are in a quiescent state * with all affected commands finished and others - blocked. * * Fantom commands are exception, because they don't do any * real work. */ spin_lock_irqsave(&res->sess->sess_list_lock, flags); list_add_tail(&res->sess_cmd_list_entry, &res->sess->sess_cmd_list); spin_unlock_irqrestore(&res->sess->sess_list_lock, flags); } scst_sess_get(res->sess); if (res->tgt_dev != NULL) res->cpu_cmd_counter = scst_get(); scst_set_start_time(res); TRACE(TRACE_SCSI, "New internal cmd %p (op %s)", res, scst_get_opcode_name(res)); rc = scst_pre_parse(res); sBUG_ON(rc != 0); res->state = SCST_CMD_STATE_PARSE; out: TRACE_EXIT_HRES((unsigned long)res); return res; } static struct scst_cmd *scst_create_prepare_internal_cmd( struct scst_cmd *orig_cmd, const uint8_t *cdb, unsigned int cdb_len, enum scst_cmd_queue_type queue_type) { struct scst_cmd *res; gfp_t gfp_mask = scst_cmd_atomic(orig_cmd) ? GFP_ATOMIC : orig_cmd->cmd_gfp_mask; TRACE_ENTRY(); res = __scst_create_prepare_internal_cmd(cdb, cdb_len, queue_type, orig_cmd->tgt_dev, gfp_mask, false); if (res == NULL) goto out; res->atomic = scst_cmd_atomic(orig_cmd); out: TRACE_EXIT_HRES((unsigned long)res); return res; } static void scst_prelim_finish_internal_cmd(struct scst_cmd *cmd) { unsigned long flags; TRACE_ENTRY(); sBUG_ON(!cmd->internal); spin_lock_irqsave(&cmd->sess->sess_list_lock, flags); list_del(&cmd->sess_cmd_list_entry); spin_unlock_irqrestore(&cmd->sess->sess_list_lock, flags); __scst_cmd_put(cmd); TRACE_EXIT(); return; } int scst_prepare_request_sense(struct scst_cmd *orig_cmd) { int res = 0; static const uint8_t request_sense[6] = { REQUEST_SENSE, 0, 0, 0, SCST_SENSE_BUFFERSIZE, 0 }; struct scst_cmd *rs_cmd; TRACE_ENTRY(); if (orig_cmd->sense != NULL) { TRACE_MEM("Releasing sense %p (orig_cmd %p)", orig_cmd->sense, orig_cmd); mempool_free(orig_cmd->sense, scst_sense_mempool); orig_cmd->sense = NULL; } rs_cmd = scst_create_prepare_internal_cmd(orig_cmd, request_sense, sizeof(request_sense), SCST_CMD_QUEUE_HEAD_OF_QUEUE); if (rs_cmd == NULL) goto out_error; rs_cmd->tgt_i_priv = orig_cmd; rs_cmd->cdb[1] |= scst_get_cmd_dev_d_sense(orig_cmd); rs_cmd->expected_data_direction = SCST_DATA_READ; rs_cmd->expected_transfer_len_full = SCST_SENSE_BUFFERSIZE; rs_cmd->expected_values_set = 1; TRACE_MGMT_DBG("Adding REQUEST SENSE cmd %p to head of active " "cmd list", rs_cmd); spin_lock_irq(&rs_cmd->cmd_threads->cmd_list_lock); list_add(&rs_cmd->cmd_list_entry, &rs_cmd->cmd_threads->active_cmd_list); wake_up(&rs_cmd->cmd_threads->cmd_list_waitQ); spin_unlock_irq(&rs_cmd->cmd_threads->cmd_list_lock); out: TRACE_EXIT_RES(res); return res; out_error: res = -1; goto out; } static void scst_complete_request_sense(struct scst_cmd *req_cmd) { struct scst_cmd *orig_cmd = req_cmd->tgt_i_priv; uint8_t *buf; int len; TRACE_ENTRY(); sBUG_ON(orig_cmd == NULL); len = scst_get_buf_full(req_cmd, &buf); if (scsi_status_is_good(req_cmd->status) && (len > 0) && scst_sense_valid(buf)) { TRACE(TRACE_SCSI|TRACE_MGMT_DEBUG, "REQUEST SENSE %p returned " "valid sense (orig cmd %s)", req_cmd, orig_cmd->op_name); PRINT_BUFF_FLAG(TRACE_SCSI|TRACE_MGMT_DEBUG, "Sense", buf, len); if (scst_no_sense(buf)) PRINT_WARNING("REQUEST SENSE returned NO SENSE (orig " "cmd %s)", orig_cmd->op_name); scst_alloc_set_sense(orig_cmd, scst_cmd_atomic(req_cmd), buf, len); } else { if (test_bit(SCST_CMD_ABORTED, &req_cmd->cmd_flags) && !test_bit(SCST_CMD_ABORTED, &orig_cmd->cmd_flags)) { TRACE_MGMT_DBG("REQUEST SENSE %p was aborted, but " "orig_cmd %p - not, retry", req_cmd, orig_cmd); } else { PRINT_ERROR("%s", "Unable to get the sense via " "REQUEST SENSE, returning HARDWARE ERROR"); scst_set_cmd_error(orig_cmd, SCST_LOAD_SENSE(scst_sense_internal_failure)); } } if (len > 0) scst_put_buf_full(req_cmd, buf); TRACE_MGMT_DBG("Adding orig cmd %p to head of active " "cmd list", orig_cmd); spin_lock_irq(&orig_cmd->cmd_threads->cmd_list_lock); list_add(&orig_cmd->cmd_list_entry, &orig_cmd->cmd_threads->active_cmd_list); wake_up(&orig_cmd->cmd_threads->cmd_list_waitQ); spin_unlock_irq(&orig_cmd->cmd_threads->cmd_list_lock); TRACE_EXIT(); return; } struct scst_ws_sg_tail { struct scatterlist *sg; int sg_cnt; }; struct scst_write_same_priv { /* Must be the first for scst_finish_internal_cmd()! */ scst_i_finish_fn_t ws_finish_fn; struct scst_cmd *ws_orig_cmd; struct mutex ws_mutex; /* 0 len terminated */ struct scst_data_descriptor *ws_descriptors; int ws_cur_descr; int ws_left_to_send; /* in blocks */ int64_t ws_cur_lba; /* in blocks */ __be16 guard_tag; __be16 app_tag; uint32_t ref_tag; unsigned int dif_valid:1; unsigned int inc_ref_tag:1; int ws_max_each;/* in blocks */ int ws_cur_in_flight; /* commands */ struct scst_ws_sg_tail *ws_sg_tails; struct scatterlist *ws_sg_full; int ws_sg_full_cnt; }; #ifdef CONFIG_SCST_EXTRACHECKS static u64 sg_data_length(struct scatterlist *sgl, int nr) { struct scatterlist *sg; u64 len = 0; int i; for_each_sg(sgl, sg, nr, i) len += sg->length; return len; } #endif /* ws_mutex suppose to be locked */ static int scst_ws_push_single_write(struct scst_write_same_priv *wsp, int64_t lba, int blocks) { struct scst_cmd *ws_cmd = wsp->ws_orig_cmd; struct scst_device *dev = ws_cmd->dev; struct scatterlist *ws_sg; int ws_sg_cnt; int res; uint8_t write_cdb[32]; int write_cdb_len; int len = blocks << ws_cmd->dev->block_shift; struct scst_cmd *cmd; bool needs_dif = wsp->dif_valid; TRACE_ENTRY(); if (blocks == wsp->ws_max_each) { ws_sg = wsp->ws_sg_full; ws_sg_cnt = wsp->ws_sg_full_cnt; } else { ws_sg = wsp->ws_sg_tails[wsp->ws_cur_descr].sg; ws_sg_cnt = wsp->ws_sg_tails[wsp->ws_cur_descr].sg_cnt; } #ifdef CONFIG_SCST_EXTRACHECKS if (len != sg_data_length(ws_sg, ws_sg_cnt)) WARN_ONCE(true, "lba %lld: %d <> %lld\n", lba, len, sg_data_length(ws_sg, ws_sg_cnt)); #endif if (unlikely(test_bit(SCST_CMD_ABORTED, &ws_cmd->cmd_flags)) || unlikely(ws_cmd->completed)) { TRACE_DBG("ws cmd %p aborted or completed (%d), aborting " "further write commands", ws_cmd, ws_cmd->completed); wsp->ws_left_to_send = 0; res = -EPIPE; goto out; } if (!needs_dif || (dev->dev_dif_type != 2)) { memset(write_cdb, 0, sizeof(write_cdb)); write_cdb[0] = WRITE_16; write_cdb_len = 16; write_cdb[1] = ws_cmd->cdb[1]; if (needs_dif) { uint8_t wrprotect = ws_cmd->cdb[1] & 0xE0; if (wrprotect == 0) wrprotect = 0x20; write_cdb[1] |= wrprotect; } put_unaligned_be64(lba, &write_cdb[2]); put_unaligned_be32(blocks, &write_cdb[10]); } else { /* There might be WRITE SAME(16) with WRPROTECT 0 here */ uint8_t wrprotect; if (ws_cmd->cdb_len != 32) wrprotect = ws_cmd->cdb[1] & 0xE0; else wrprotect = ws_cmd->cdb[10] & 0xE0; if (wrprotect == 0) wrprotect = 0x20; write_cdb[0] = VARIABLE_LENGTH_CMD; put_unaligned_be16(SUBCODE_WRITE_32, &write_cdb[8]); write_cdb[7] = 0x18; write_cdb_len = 32; write_cdb[10] = ws_cmd->cdb[10]; write_cdb[10] |= wrprotect; put_unaligned_be64(lba, &write_cdb[12]); put_unaligned_be32(blocks, &write_cdb[28]); put_unaligned_be32(wsp->ref_tag, &write_cdb[20]); put_unaligned(wsp->app_tag, &write_cdb[24]); write_cdb[26] = ws_cmd->cdb[26]; write_cdb[27] = ws_cmd->cdb[27]; } cmd = scst_create_prepare_internal_cmd(ws_cmd, write_cdb, write_cdb_len, SCST_CMD_QUEUE_SIMPLE); if (cmd == NULL) { res = -ENOMEM; goto out_busy; } cmd->expected_data_direction = SCST_DATA_WRITE; cmd->expected_transfer_len_full = len; cmd->expected_values_set = 1; cmd->tgt_i_priv = wsp; if (needs_dif) { struct scatterlist *dif_sg, *s; struct sgv_pool_obj *dif_sgv = NULL; int dif_bufflen, i, dif_sg_cnt = 0; TRACE_DBG("Allocating and filling DIF buff for cmd %p " "(ws_cmd %p)", cmd, ws_cmd); dif_bufflen = blocks << SCST_DIF_TAG_SHIFT; cmd->expected_transfer_len_full += dif_bufflen; dif_sg = sgv_pool_alloc(ws_cmd->tgt_dev->pools[raw_smp_processor_id()], dif_bufflen, GFP_KERNEL, 0, &dif_sg_cnt, &dif_sgv, &cmd->dev->dev_mem_lim, NULL); if (unlikely(dif_sg == NULL)) { TRACE(TRACE_OUT_OF_MEM, "Unable to alloc DIF sg " "for %d blocks", blocks); res = -ENOMEM; goto out_free_cmd; } cmd->out_sgv = dif_sgv; /* hacky, but it isn't used for WRITE(16/32) */ cmd->tgt_i_dif_sg = dif_sg; cmd->tgt_i_dif_sg_cnt = dif_sg_cnt; TRACE_DBG("dif_sg %p, cnt %d", dif_sg, dif_sg_cnt); for_each_sg(dif_sg, s, dif_sg_cnt, i) { int left = (s->length - s->offset) >> SCST_DIF_TAG_SHIFT; struct t10_pi_tuple *t = sg_virt(s); TRACE_DBG("sg %p, offset %d, length %d, left %d", s, s->offset, s->length, left); while (left > 0) { t->app_tag = wsp->app_tag; t->ref_tag = cpu_to_be32(wsp->ref_tag); if (wsp->inc_ref_tag) wsp->ref_tag++; t->guard_tag = wsp->guard_tag; t++; left--; } } } cmd->tgt_i_sg = ws_sg; cmd->tgt_i_sg_cnt = ws_sg_cnt; cmd->tgt_i_data_buf_alloced = 1; wsp->ws_cur_lba += blocks; wsp->ws_left_to_send -= blocks; wsp->ws_cur_in_flight++; TRACE_DBG("Adding WRITE(16) cmd %p to active cmd list", cmd); spin_lock_irq(&cmd->cmd_threads->cmd_list_lock); list_add_tail(&cmd->cmd_list_entry, &cmd->cmd_threads->active_cmd_list); spin_unlock_irq(&cmd->cmd_threads->cmd_list_lock); res = 0; out: TRACE_EXIT_RES(res); return res; out_free_cmd: scst_prelim_finish_internal_cmd(cmd); out_busy: scst_set_busy(ws_cmd); goto out; } static void scst_ws_finished(struct scst_write_same_priv *wsp) { struct scst_cmd *ws_cmd = wsp->ws_orig_cmd; int i; TRACE_ENTRY(); TRACE_DBG("ws cmd %p finished with status %d", ws_cmd, ws_cmd->status); sBUG_ON(wsp->ws_cur_in_flight != 0); if (wsp->ws_sg_full && sg_page(&wsp->ws_sg_full[0]) != sg_page(ws_cmd->sg)) __free_page(sg_page(&wsp->ws_sg_full[0])); else if (wsp->ws_sg_tails && wsp->ws_sg_tails[0].sg_cnt != 0 && sg_page(&wsp->ws_sg_tails[0].sg[0]) != sg_page(ws_cmd->sg)) __free_page(sg_page(&wsp->ws_sg_tails[0].sg[0])); kfree(wsp->ws_sg_full); if (wsp->ws_sg_tails) { for (i = 0; wsp->ws_descriptors[i].sdd_blocks != 0; i++) if (wsp->ws_sg_tails[i].sg_cnt != 0) kfree(wsp->ws_sg_tails[i].sg); kfree(wsp->ws_sg_tails); } kfree(wsp->ws_descriptors); kfree(wsp); ws_cmd->completed = 1; /* for success */ ws_cmd->scst_cmd_done(ws_cmd, SCST_CMD_STATE_DEFAULT, SCST_CONTEXT_THREAD); TRACE_EXIT(); return; } /* Must be called in a thread context and no locks */ static void scst_ws_write_cmd_finished(struct scst_cmd *cmd) { struct scst_write_same_priv *wsp = cmd->tgt_i_priv; struct scst_cmd *ws_cmd = wsp->ws_orig_cmd; int rc, blocks; TRACE_ENTRY(); TRACE_DBG("Write cmd %p finished (ws cmd %p, ws_cur_in_flight %d)", cmd, ws_cmd, wsp->ws_cur_in_flight); if (cmd->out_sgv != NULL) sgv_pool_free(cmd->out_sgv, &cmd->dev->dev_mem_lim); cmd->sg = NULL; cmd->sg_cnt = 0; mutex_lock(&wsp->ws_mutex); wsp->ws_cur_in_flight--; if (cmd->status != 0) { TRACE_DBG("Write cmd %p (ws cmd %p) finished not successfully", cmd, ws_cmd); sBUG_ON(cmd->resp_data_len != 0); if (cmd->status == SAM_STAT_CHECK_CONDITION) rc = scst_set_cmd_error_sense(ws_cmd, cmd->sense, cmd->sense_valid_len); else { sBUG_ON(cmd->sense != NULL); rc = scst_set_cmd_error_status(ws_cmd, cmd->status); } if (rc != 0) { /* Requeue possible UA */ if (scst_is_ua_sense(cmd->sense, cmd->sense_valid_len)) scst_requeue_ua(cmd, NULL, 0); } } if (wsp->ws_left_to_send == 0) { if (wsp->ws_descriptors[wsp->ws_cur_descr+1].sdd_blocks != 0) { wsp->ws_cur_descr++; wsp->ws_cur_lba = wsp->ws_descriptors[wsp->ws_cur_descr].sdd_lba; wsp->ws_left_to_send = wsp->ws_descriptors[wsp->ws_cur_descr].sdd_blocks; TRACE_DBG("wsp %p, cur descr %d, cur lba %lld, left %d", wsp, wsp->ws_cur_descr, (long long)wsp->ws_cur_lba, wsp->ws_left_to_send); } if (wsp->ws_left_to_send == 0) goto out_check_finish; } blocks = min_t(int, wsp->ws_left_to_send, wsp->ws_max_each); rc = scst_ws_push_single_write(wsp, wsp->ws_cur_lba, blocks); if (rc != 0) goto out_check_finish; wake_up(&ws_cmd->cmd_threads->cmd_list_waitQ); out_unlock: mutex_unlock(&wsp->ws_mutex); out: TRACE_EXIT(); return; out_check_finish: if (wsp->ws_cur_in_flight > 0) goto out_unlock; mutex_unlock(&wsp->ws_mutex); scst_ws_finished(wsp); goto out; } /* Must be called in a thread context and no locks */ static void scst_ws_gen_writes(struct scst_write_same_priv *wsp) { struct scst_cmd *ws_cmd = wsp->ws_orig_cmd; int cnt = 0; int rc; TRACE_ENTRY(); mutex_lock(&wsp->ws_mutex); again: while (wsp->ws_left_to_send >= wsp->ws_max_each && wsp->ws_cur_in_flight < SCST_MAX_IN_FLIGHT_INTERNAL_COMMANDS) { rc = scst_ws_push_single_write(wsp, wsp->ws_cur_lba, wsp->ws_max_each); if (rc != 0) goto out_err; cnt++; } if (wsp->ws_left_to_send > 0 && wsp->ws_cur_in_flight < SCST_MAX_IN_FLIGHT_INTERNAL_COMMANDS) { rc = scst_ws_push_single_write(wsp, wsp->ws_cur_lba, wsp->ws_left_to_send); if (rc != 0) goto out_err; cnt++; } if ((wsp->ws_left_to_send == 0) && (wsp->ws_descriptors[wsp->ws_cur_descr+1].sdd_blocks != 0)) { wsp->ws_cur_descr++; wsp->ws_cur_lba = wsp->ws_descriptors[wsp->ws_cur_descr].sdd_lba; wsp->ws_left_to_send = wsp->ws_descriptors[wsp->ws_cur_descr].sdd_blocks; TRACE_DBG("wsp %p, cur descr %d, cur lba %lld, left %d", wsp, wsp->ws_cur_descr, (long long)wsp->ws_cur_lba, wsp->ws_left_to_send); goto again; } out_wake: if (cnt != 0) wake_up(&ws_cmd->cmd_threads->cmd_list_waitQ); mutex_unlock(&wsp->ws_mutex); out: TRACE_EXIT(); return; out_err: if (wsp->ws_cur_in_flight != 0) goto out_wake; else { mutex_unlock(&wsp->ws_mutex); scst_ws_finished(wsp); goto out; } } static int scst_ws_sg_init(struct scatterlist **ws_sg, int ws_sg_cnt, struct page *pg, unsigned int offset, unsigned int length, unsigned int total_bytes) { struct scatterlist *sg; int i; *ws_sg = kmalloc_array(ws_sg_cnt, sizeof(**ws_sg), GFP_KERNEL); if (*ws_sg == NULL) { PRINT_ERROR("Unable to alloc sg for %d entries", ws_sg_cnt); return -ENOMEM; } sg_init_table(*ws_sg, ws_sg_cnt); for_each_sg(*ws_sg, sg, ws_sg_cnt, i) { u32 len = min(total_bytes, length); sg_set_page(sg, pg, len, offset); total_bytes -= len; } sBUG_ON(total_bytes != 0); /* crash here to avoid data corruption */ return 0; } static int scst_ws_sg_tails_get(struct scst_data_descriptor *where, struct scst_write_same_priv *wsp) { int i; uint64_t n; TRACE_ENTRY(); for (i = 0; where[i].sdd_blocks != 0; i++) { if (where[i].sdd_blocks >= wsp->ws_max_each) { wsp->ws_sg_full_cnt = wsp->ws_max_each; break; } } while (where[i].sdd_blocks != 0) i++; wsp->ws_sg_tails = kcalloc(i + 1, sizeof(*wsp->ws_sg_tails), GFP_KERNEL); if (wsp->ws_sg_tails == NULL) { PRINT_ERROR("Unable to allocate ws_sg_tails (size %zd)", sizeof(*wsp->ws_sg_tails)*i); return -ENOMEM; } for (i = 0; where[i].sdd_blocks != 0; i++) { n = where[i].sdd_blocks; wsp->ws_sg_tails[i].sg_cnt = do_div(n, wsp->ws_max_each); } TRACE_EXIT(); return 0; } /* * Library function to perform WRITE SAME in a generic manner. On exit, cmd * always completed with sense set, if necessary. * * Parameter "where" is an array of descriptors where to write the same * block. Last element in this array has len 0. It must be allocated by * k?alloc() and will be kfree() by this function on finish. */ void scst_write_same(struct scst_cmd *cmd, struct scst_data_descriptor *where) { struct scst_write_same_priv *wsp; int i, rc; struct page *pg = NULL; unsigned int offset, length, mult, ws_sg_full_blocks, ws_sg_tail_blocks; uint8_t ctrl_offs = (cmd->cdb_len < 32) ? 1 : 10; TRACE_ENTRY(); scst_set_exec_time(cmd); if (unlikely(cmd->data_len <= 0)) { scst_set_invalid_field_in_cdb(cmd, cmd->len_off, 0); goto out_done; } if (cmd->sg_cnt != 1) { PRINT_WARNING("WRITE SAME must contain only single block of data " "in a single SG (cmd %p)", cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_parameter_value_invalid)); goto out_done; } if (unlikely((cmd->cdb[ctrl_offs] & 0x6) != 0)) { TRACE(TRACE_MINOR, "LBDATA and/or PBDATA (ctrl %x) are not " "supported", cmd->cdb[ctrl_offs]); scst_set_invalid_field_in_cdb(cmd, ctrl_offs, SCST_INVAL_FIELD_BIT_OFFS_VALID | 1); goto out_done; } if (unlikely((uint64_t)cmd->data_len > cmd->dev->max_write_same_len)) { PRINT_WARNING("Invalid WRITE SAME data len %lld (max allowed " "%lld)", (long long)cmd->data_len, (long long)cmd->dev->max_write_same_len); scst_set_invalid_field_in_cdb(cmd, cmd->len_off, 0); goto out_done; } if (where == NULL) { where = kzalloc(sizeof(*where) << 1, GFP_KERNEL); if (where == NULL) { PRINT_ERROR("Unable to allocate ws_priv (size %zd, cmd %p)", sizeof(*where) << 1, cmd); goto out_busy; } where->sdd_lba = cmd->lba; where->sdd_blocks = cmd->data_len >> cmd->dev->block_shift; } if (unlikely(where->sdd_blocks == 0)) goto out_done; rc = scst_dif_process_write(cmd); if (unlikely(rc != 0)) goto out_done; wsp = kzalloc(sizeof(*wsp), GFP_KERNEL); if (wsp == NULL) { PRINT_ERROR("Unable to allocate ws_priv (size %zd, cmd %p)", sizeof(*wsp), cmd); goto out_busy; } mutex_init(&wsp->ws_mutex); wsp->ws_finish_fn = scst_ws_write_cmd_finished; wsp->ws_orig_cmd = cmd; wsp->ws_descriptors = where; wsp->ws_cur_descr = 0; wsp->ws_cur_lba = where[0].sdd_lba; wsp->ws_left_to_send = where[0].sdd_blocks; wsp->ws_max_each = SCST_MAX_EACH_INTERNAL_IO_SIZE >> cmd->dev->block_shift; if (scst_ws_sg_tails_get(where, wsp) == -ENOMEM) goto out_busy; if (cmd->bufflen <= PAGE_SIZE / 2) pg = alloc_page(GFP_KERNEL); if (pg) { struct page *src_pg; void *src, *dst; int k; mult = 0; src_pg = sg_page(cmd->sg); src = kmap(src_pg); dst = kmap(pg); for (k = 0; k < PAGE_SIZE; k += cmd->bufflen, mult++) memcpy(dst + k, src + cmd->sg->offset, cmd->bufflen); kunmap(pg); kunmap(src_pg); offset = 0; length = k; } else { pg = sg_page(cmd->sg); offset = cmd->sg->offset; length = cmd->sg->length; mult = 1; } if (wsp->ws_sg_full_cnt != 0) { ws_sg_full_blocks = wsp->ws_sg_full_cnt; wsp->ws_sg_full_cnt = (ws_sg_full_blocks + mult - 1) / mult; TRACE_DBG("Allocating %d SGs", wsp->ws_sg_full_cnt); rc = scst_ws_sg_init(&wsp->ws_sg_full, wsp->ws_sg_full_cnt, pg, offset, length, ws_sg_full_blocks << cmd->dev->block_shift); if (rc != 0) goto out_free; } for (i = 0; wsp->ws_descriptors[i].sdd_blocks != 0; i++) { if (wsp->ws_sg_tails[i].sg_cnt != 0) { ws_sg_tail_blocks = wsp->ws_sg_tails[i].sg_cnt; wsp->ws_sg_tails[i].sg_cnt = (ws_sg_tail_blocks + mult - 1) / mult; TRACE_DBG("Allocating %d tail SGs for descriptor[%d] ", wsp->ws_sg_tails[i].sg_cnt, i); rc = scst_ws_sg_init(&wsp->ws_sg_tails[i].sg, wsp->ws_sg_tails[i].sg_cnt, pg, offset, length, ws_sg_tail_blocks << cmd->dev->block_shift); if (rc != 0) goto out_free; } } if (scst_cmd_needs_dif_buf(cmd)) { struct t10_pi_tuple *t; struct scatterlist *tags_sg = NULL; int tags_len = 0; t = (struct t10_pi_tuple *)scst_get_dif_buf(cmd, &tags_sg, &tags_len); wsp->app_tag = t->app_tag; wsp->ref_tag = be32_to_cpu(t->ref_tag); wsp->guard_tag = t->guard_tag; wsp->dif_valid = 1; switch (cmd->dev->dev_dif_type) { case 1: case 2: wsp->inc_ref_tag = 1; break; case 3: wsp->inc_ref_tag = 0; break; default: sBUG(); break; } scst_put_dif_buf(cmd, t); } scst_ws_gen_writes(wsp); out: TRACE_EXIT(); return; out_free: if (pg && pg != sg_page(cmd->sg)) __free_page(pg); kfree(wsp); out_busy: scst_set_busy(cmd); out_done: kfree(where); cmd->scst_cmd_done(cmd, SCST_CMD_STATE_DEFAULT, SCST_CONTEXT_THREAD); goto out; } EXPORT_SYMBOL_GPL(scst_write_same); struct scst_cwr_priv { /* Must be the first for scst_finish_internal_cmd()! */ scst_i_finish_fn_t cwr_finish_fn; struct scst_cmd *cwr_orig_cmd; }; static void scst_cwr_finished(struct scst_cwr_priv *cwrp) { struct scst_cmd *cwr_cmd = cwrp->cwr_orig_cmd; TRACE_ENTRY(); TRACE_DBG("cwr cmd %p finished with status %d", cwr_cmd, cwr_cmd->status); kfree(cwrp); cwr_cmd->completed = 1; /* for success */ cwr_cmd->scst_cmd_done(cwr_cmd, SCST_CMD_STATE_DEFAULT, SCST_CONTEXT_THREAD); TRACE_EXIT(); return; } static void scst_cwr_write_cmd_finished(struct scst_cmd *cmd) { struct scst_cwr_priv *cwrp = cmd->tgt_i_priv; struct scst_cmd *cwr_cmd = cwrp->cwr_orig_cmd; TRACE_ENTRY(); TRACE_DBG("WRITE cmd %p finished (cwr cmd %p)", cmd, cwr_cmd); EXTRACHECKS_BUG_ON(cmd->cdb[0] != WRITE_16); if (cmd->status != 0) { int rc; TRACE_DBG("WRITE cmd %p (cwr cmd %p) finished not successfully", cmd, cwr_cmd); sBUG_ON(cmd->resp_data_len != 0); if (cmd->status == SAM_STAT_CHECK_CONDITION) rc = scst_set_cmd_error_sense(cwr_cmd, cmd->sense, cmd->sense_valid_len); else { sBUG_ON(cmd->sense != NULL); rc = scst_set_cmd_error_status(cwr_cmd, cmd->status); } if (rc != 0) { /* Requeue possible UA */ if (scst_is_ua_sense(cmd->sense, cmd->sense_valid_len)) scst_requeue_ua(cmd, NULL, 0); } } scst_cwr_finished(cwrp); TRACE_EXIT(); return; } static void scst_cwr_read_cmd_finished(struct scst_cmd *cmd) { struct scst_cwr_priv *cwrp = cmd->tgt_i_priv; struct scst_cmd *cwr_cmd = cwrp->cwr_orig_cmd; bool c, dif; uint8_t write16_cdb[16]; struct scst_cmd *wcmd; int data_len, miscompare_offs, rc; TRACE_ENTRY(); TRACE_DBG("READ cmd %p finished (cwr cmd %p)", cmd, cwr_cmd); if (cmd->status != 0) { TRACE_DBG("Read cmd %p (cwr cmd %p) finished not successfully", cmd, cwr_cmd); sBUG_ON(cmd->resp_data_len != 0); if (cmd->status == SAM_STAT_CHECK_CONDITION) rc = scst_set_cmd_error_sense(cwr_cmd, cmd->sense, cmd->sense_valid_len); else { sBUG_ON(cmd->sense != NULL); rc = scst_set_cmd_error_status(cwr_cmd, cmd->status); } if (rc != 0) { /* Requeue possible UA */ if (scst_is_ua_sense(cmd->sense, cmd->sense_valid_len)) scst_requeue_ua(cmd, NULL, 0); } goto out_finish; } if (unlikely(test_bit(SCST_CMD_ABORTED, &cwr_cmd->cmd_flags))) { TRACE_MGMT_DBG("cwr cmd %p aborted", cwr_cmd); goto out_finish; } c = sg_cmp(cmd->sg, cwr_cmd->sg, 0, 0, &miscompare_offs #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) , KM_USER0, KM_USER1 #endif ); if (!c) { scst_set_cmd_error_and_inf(cwr_cmd, SCST_LOAD_SENSE(scst_sense_miscompare_error), miscompare_offs); goto out_finish; } data_len = cwr_cmd->data_len; /* We ignore the read PI checks as required by SBC */ rc = scst_dif_process_write(cmd); if (unlikely(rc != 0)) goto out_finish; memset(write16_cdb, 0, sizeof(write16_cdb)); write16_cdb[0] = WRITE_16; write16_cdb[1] = cwr_cmd->cdb[1]; put_unaligned_be64(cwr_cmd->lba, &write16_cdb[2]); put_unaligned_be32(data_len >> cmd->dev->block_shift, &write16_cdb[10]); dif = scst_cmd_needs_dif_buf(cwr_cmd) && ((cwr_cmd->cdb[1] & 0xE0) != 0); if (dif) write16_cdb[1] |= cwr_cmd->cdb[1] & 0xE0; wcmd = scst_create_prepare_internal_cmd(cwr_cmd, write16_cdb, sizeof(write16_cdb), SCST_CMD_QUEUE_HEAD_OF_QUEUE); if (wcmd == NULL) goto out_busy; wcmd->expected_data_direction = SCST_DATA_WRITE; wcmd->expected_transfer_len_full = data_len; if (dif) wcmd->expected_transfer_len_full += data_len >> (cmd->dev->block_shift - SCST_DIF_TAG_SHIFT); wcmd->expected_values_set = 1; wcmd->tgt_i_priv = cwrp; rc = scst_adjust_sg_get_tail(cwr_cmd, &wcmd->tgt_i_sg, &wcmd->tgt_i_sg_cnt, &wcmd->tgt_i_dif_sg, &wcmd->tgt_i_dif_sg_cnt, data_len, data_len); /* * It must not happen, because get_cdb_info_compare_and_write() * supposed to ensure that. */ EXTRACHECKS_BUG_ON(rc != 0); wcmd->tgt_i_data_buf_alloced = 1; cwrp->cwr_finish_fn = scst_cwr_write_cmd_finished; TRACE_DBG("Adding WRITE(16) wcmd %p to head of active cmd list", wcmd); spin_lock_irq(&wcmd->cmd_threads->cmd_list_lock); list_add(&wcmd->cmd_list_entry, &wcmd->cmd_threads->active_cmd_list); wake_up(&wcmd->cmd_threads->cmd_list_waitQ); spin_unlock_irq(&wcmd->cmd_threads->cmd_list_lock); out: TRACE_EXIT(); return; out_busy: scst_set_busy(cwr_cmd); out_finish: scst_cwr_finished(cwrp); goto out; } int scst_cmp_wr_local(struct scst_cmd *cmd) { int res = SCST_EXEC_COMPLETED; struct scst_cwr_priv *cwrp; uint8_t read16_cdb[16]; struct scst_cmd *rcmd; int data_len; TRACE_ENTRY(); /* COMPARE AND WRITE is SBC only command */ EXTRACHECKS_BUG_ON(cmd->dev->type != TYPE_DISK); cmd->status = 0; cmd->msg_status = 0; cmd->host_status = DID_OK; cmd->driver_status = 0; if (unlikely(cmd->bufflen == 0)) { TRACE(TRACE_MINOR, "Zero bufflen (cmd %p)", cmd); goto out_done; } /* ToDo: HWALIGN'ed kmem_cache */ cwrp = kzalloc(sizeof(*cwrp), GFP_KERNEL); if (cwrp == NULL) { PRINT_ERROR("Unable to allocate cwr_priv (size %zd, cmd %p)", sizeof(*cwrp), cmd); goto out_busy; } cwrp->cwr_orig_cmd = cmd; cwrp->cwr_finish_fn = scst_cwr_read_cmd_finished; data_len = cmd->data_len; /* * As required by SBC, DIF PI, if any, is not checked for the read part */ memset(read16_cdb, 0, sizeof(read16_cdb)); read16_cdb[0] = READ_16; read16_cdb[1] = cmd->cdb[1] & ~0xE0; /* as required, see above */ put_unaligned_be64(cmd->lba, &read16_cdb[2]); put_unaligned_be32(data_len >> cmd->dev->block_shift, &read16_cdb[10]); rcmd = scst_create_prepare_internal_cmd(cmd, read16_cdb, sizeof(read16_cdb), SCST_CMD_QUEUE_HEAD_OF_QUEUE); if (rcmd == NULL) { res = -ENOMEM; goto out_free; } rcmd->expected_data_direction = SCST_DATA_READ; rcmd->expected_transfer_len_full = data_len; rcmd->expected_values_set = 1; rcmd->tgt_i_priv = cwrp; TRACE_DBG("Adding READ(16) cmd %p to head of active cmd list", rcmd); spin_lock_irq(&rcmd->cmd_threads->cmd_list_lock); list_add(&rcmd->cmd_list_entry, &rcmd->cmd_threads->active_cmd_list); wake_up(&rcmd->cmd_threads->cmd_list_waitQ); spin_unlock_irq(&rcmd->cmd_threads->cmd_list_lock); out: TRACE_EXIT_RES(res); return res; out_free: kfree(cwrp); out_busy: scst_set_busy(cmd); out_done: cmd->scst_cmd_done(cmd, SCST_CMD_STATE_DEFAULT, SCST_CONTEXT_THREAD); goto out; } int scst_finish_internal_cmd(struct scst_cmd *cmd) { int res; unsigned long flags; TRACE_ENTRY(); sBUG_ON(!cmd->internal); if (scst_cmd_atomic(cmd)) { TRACE_DBG("Rescheduling finished internal atomic cmd %p in a " "thread context", cmd); res = SCST_CMD_STATE_RES_NEED_THREAD; goto out; } spin_lock_irqsave(&cmd->sess->sess_list_lock, flags); list_del(&cmd->sess_cmd_list_entry); cmd->done = 1; cmd->finished = 1; spin_unlock_irqrestore(&cmd->sess->sess_list_lock, flags); if (unlikely(test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags))) { scst_done_cmd_mgmt(cmd); scst_finish_cmd_mgmt(cmd); } if (cmd->cdb[0] == REQUEST_SENSE) scst_complete_request_sense(cmd); else { scst_i_finish_fn_t f = (void *) *((unsigned long long **)cmd->tgt_i_priv); f(cmd); } __scst_cmd_put(cmd); res = SCST_CMD_STATE_RES_CONT_NEXT; out: TRACE_EXIT_HRES(res); return res; } int scst_scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, int data_direction, void *buffer, unsigned bufflen, unsigned char *sense, int timeout, int retries, u64 flags) { return scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) NULL, /* sshdr */ #endif timeout, retries, flags #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) , 0 /* rq_flags */ #endif #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29) , NULL /* resid */ #endif ); } EXPORT_SYMBOL(scst_scsi_execute); static void scst_send_release(struct scst_device *dev) { struct scsi_device *scsi_dev; unsigned char cdb[6]; uint8_t sense[SCSI_SENSE_BUFFERSIZE]; int rc, i; TRACE_ENTRY(); if (dev->scsi_dev == NULL) goto out; scsi_dev = dev->scsi_dev; for (i = 0; i < 5; i++) { memset(cdb, 0, sizeof(cdb)); cdb[0] = RELEASE; cdb[1] = (scsi_dev->scsi_level <= SCSI_2) ? ((scsi_dev->lun << 5) & 0xe0) : 0; memset(sense, 0, sizeof(sense)); TRACE(TRACE_DEBUG | TRACE_SCSI, "%s", "Sending RELEASE req to " "SCSI mid-level"); rc = scst_scsi_execute(scsi_dev, cdb, SCST_DATA_NONE, NULL, 0, sense, 15, 0, 0); TRACE_DBG("RELEASE done: %x", rc); if (scsi_status_is_good(rc)) { break; } else { PRINT_ERROR("RELEASE failed: %d", rc); PRINT_BUFFER("RELEASE sense", sense, sizeof(sense)); scst_check_internal_sense(dev, rc, sense, sizeof(sense)); } } out: TRACE_EXIT(); return; } /* scst_mutex supposed to be held */ static void scst_clear_reservation(struct scst_tgt_dev *tgt_dev) { struct scst_device *dev = tgt_dev->dev; struct scst_lksb pr_lksb; int release = 0; TRACE_ENTRY(); scst_res_lock(dev, &pr_lksb); if (scst_is_reservation_holder(dev, tgt_dev->sess)) { /* This is one who holds the reservation */ scst_clear_dev_reservation(dev); release = 1; } scst_res_unlock(dev, &pr_lksb); if (release) scst_send_release(dev); TRACE_EXIT(); return; } struct scst_session *scst_alloc_session(struct scst_tgt *tgt, gfp_t gfp_mask, const char *initiator_name) { struct scst_session *sess; int i; TRACE_ENTRY(); sess = kmem_cache_zalloc(scst_sess_cachep, gfp_mask); if (sess == NULL) { PRINT_ERROR("%s", "Allocation of scst_session failed"); goto out; } sess->init_phase = SCST_SESS_IPH_INITING; sess->shut_phase = SCST_SESS_SPH_READY; atomic_set(&sess->refcnt, 0); for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { struct list_head *head = &sess->sess_tgt_dev_list[i]; INIT_LIST_HEAD(head); } spin_lock_init(&sess->sess_list_lock); INIT_LIST_HEAD(&sess->sess_cmd_list); sess->tgt = tgt; INIT_LIST_HEAD(&sess->init_deferred_cmd_list); INIT_LIST_HEAD(&sess->init_deferred_mcmd_list); INIT_LIST_HEAD(&sess->sess_cm_list_id_list); #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) INIT_DELAYED_WORK(&sess->sess_cm_list_id_cleanup_work, sess_cm_list_id_cleanup_work_fn); INIT_DELAYED_WORK(&sess->hw_pending_work, scst_hw_pending_work_fn); #else INIT_WORK(&sess->sess_cm_list_id_cleanup_work, sess_cm_list_id_cleanup_work_fn, sess); INIT_WORK(&sess->hw_pending_work, scst_hw_pending_work_fn, sess); #endif #ifdef CONFIG_SCST_MEASURE_LATENCY spin_lock_init(&sess->lat_lock); #endif sess->initiator_name = kstrdup(initiator_name, gfp_mask); if (sess->initiator_name == NULL) { PRINT_ERROR("%s", "Unable to dup sess->initiator_name"); goto out_free; } out: TRACE_EXIT(); return sess; out_free: kmem_cache_free(scst_sess_cachep, sess); sess = NULL; goto out; } void scst_free_session(struct scst_session *sess) { TRACE_ENTRY(); mutex_lock(&scst_mutex); scst_sess_free_tgt_devs(sess); TRACE_DBG("Removing sess %p from the list", sess); list_del(&sess->sess_list_entry); TRACE_DBG("Removing session %p from acg %s", sess, sess->acg->acg_name); list_del(&sess->acg_sess_list_entry); scst_put_acg(sess->acg); mutex_unlock(&scst_mutex); #ifndef CONFIG_SCST_PROC scst_sess_sysfs_del(sess); #endif if (sess->unreg_done_fn) { TRACE_DBG("Calling unreg_done_fn(%p)", sess); sess->unreg_done_fn(sess); TRACE_DBG("%s", "unreg_done_fn() returned"); } mutex_lock(&scst_mutex); list_del(&sess->sysfs_sess_list_entry); /* Called under lock to protect from too early tgt release */ wake_up_all(&sess->tgt->unreg_waitQ); /* * NOTE: do not dereference the sess->tgt pointer after scst_mutex * has been unlocked, because it can be already dead!! */ mutex_unlock(&scst_mutex); kfree(sess->transport_id); kfree(sess->initiator_name); if (sess->sess_name != sess->initiator_name) kfree(sess->sess_name); kmem_cache_free(scst_sess_cachep, sess); TRACE_EXIT(); return; } void scst_free_session_callback(struct scst_session *sess) { struct completion *c; TRACE_ENTRY(); TRACE_DBG("Freeing session %p", sess); cancel_delayed_work_sync(&sess->hw_pending_work); c = sess->shutdown_compl; mutex_lock(&scst_mutex); /* * Necessary to sync with other threads trying to queue AEN, which * the target driver will not be able to serve and crash, because after * unreg_done_fn() called its internal session data will be destroyed. */ sess->shut_phase = SCST_SESS_SPH_UNREG_DONE_CALLING; mutex_unlock(&scst_mutex); scst_free_session(sess); if (c) complete_all(c); TRACE_EXIT(); return; } void scst_sched_session_free(struct scst_session *sess) { unsigned long flags; TRACE_ENTRY(); if (sess->shut_phase != SCST_SESS_SPH_SHUTDOWN) { PRINT_CRIT_ERROR("session %p is going to shutdown with unknown " "shut phase %lx", sess, sess->shut_phase); sBUG(); } spin_lock_irqsave(&scst_mgmt_lock, flags); TRACE_DBG("Adding sess %p to scst_sess_shut_list", sess); list_add_tail(&sess->sess_shut_list_entry, &scst_sess_shut_list); spin_unlock_irqrestore(&scst_mgmt_lock, flags); wake_up(&scst_mgmt_waitQ); TRACE_EXIT(); return; } /** * scst_cmd_get() - increase command's reference counter */ void scst_cmd_get(struct scst_cmd *cmd) { __scst_cmd_get(cmd); } EXPORT_SYMBOL(scst_cmd_get); /** * scst_cmd_put() - decrease command's reference counter */ void scst_cmd_put(struct scst_cmd *cmd) { __scst_cmd_put(cmd); } EXPORT_SYMBOL(scst_cmd_put); /** * scst_cmd_set_ext_cdb() - sets cmd's extended CDB and its length */ void scst_cmd_set_ext_cdb(struct scst_cmd *cmd, uint8_t *ext_cdb, unsigned int ext_cdb_len, gfp_t gfp_mask) { unsigned int len = cmd->cdb_len + ext_cdb_len; TRACE_ENTRY(); if (len <= sizeof(cmd->cdb_buf)) goto copy; if (unlikely(len > SCST_MAX_LONG_CDB_SIZE)) { PRINT_ERROR("Too big CDB (%d)", len); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_hardw_error)); goto out; } /* It's read-mostly, so cache alignment isn't needed */ cmd->cdb = kmalloc(len, gfp_mask); if (unlikely(cmd->cdb == NULL)) { PRINT_ERROR("Unable to alloc extended CDB (size %d)", len); goto out_err; } memcpy(cmd->cdb, cmd->cdb_buf, cmd->cdb_len); copy: memcpy(&cmd->cdb[cmd->cdb_len], ext_cdb, ext_cdb_len); cmd->cdb_len = cmd->cdb_len + ext_cdb_len; out: TRACE_EXIT(); return; out_err: cmd->cdb = cmd->cdb_buf; scst_set_busy(cmd); goto out; } EXPORT_SYMBOL(scst_cmd_set_ext_cdb); int scst_pre_init_cmd(struct scst_cmd *cmd, const uint8_t *cdb, unsigned int cdb_len, gfp_t gfp_mask) { int res; TRACE_ENTRY(); #ifdef CONFIG_SCST_EXTRACHECKS /* cmd supposed to be zeroed */ { int i; uint8_t *b = (uint8_t *)cmd; for (i = 0; i < sizeof(*cmd); i++) EXTRACHECKS_BUG_ON(b[i] != 0); } #endif cmd->state = SCST_CMD_STATE_INIT_WAIT; cmd->start_time = jiffies; atomic_set(&cmd->cmd_ref, 1); cmd->cmd_threads = &scst_main_cmd_threads; cmd->cmd_gfp_mask = GFP_KERNEL; INIT_LIST_HEAD(&cmd->mgmt_cmd_list); cmd->cdb = cmd->cdb_buf; cmd->queue_type = SCST_CMD_QUEUE_SIMPLE; cmd->timeout = SCST_DEFAULT_TIMEOUT; cmd->retries = 0; #ifdef CONFIG_SCST_EXTRACHECKS /* To ensure they are inited */ cmd->lba = SCST_DEF_LBA_DATA_LEN; cmd->data_len = SCST_DEF_LBA_DATA_LEN; #endif cmd->is_send_status = 1; cmd->resp_data_len = -1; cmd->write_sg = &cmd->sg; cmd->write_sg_cnt = &cmd->sg_cnt; cmd->dbl_ua_orig_data_direction = SCST_DATA_UNKNOWN; cmd->dbl_ua_orig_resp_data_len = -1; if (unlikely(cdb_len == 0)) { PRINT_ERROR("%s", "Wrong CDB len 0, finishing cmd"); res = -EINVAL; goto out; } else if (cdb_len <= SCST_MAX_CDB_SIZE) { /* Duplicate memcpy to save a branch on the most common path */ memcpy(cmd->cdb, cdb, cdb_len); } else { if (unlikely(cdb_len > SCST_MAX_LONG_CDB_SIZE)) { PRINT_ERROR("Too big CDB (%d), finishing cmd", cdb_len); res = -EINVAL; goto out; } /* It's read-mostly, so cache alignment isn't needed */ cmd->cdb = kmalloc(cdb_len, gfp_mask); if (unlikely(cmd->cdb == NULL)) { PRINT_ERROR("Unable to alloc extended CDB (size %d)", cdb_len); res = -ENOMEM; goto out; } memcpy(cmd->cdb, cdb, cdb_len); } cmd->cdb_len = cdb_len; res = 0; out: TRACE_EXIT_RES(res); return res; } struct scst_cmd *scst_alloc_cmd(const uint8_t *cdb, unsigned int cdb_len, gfp_t gfp_mask) { struct scst_cmd *cmd; int rc; TRACE_ENTRY(); cmd = kmem_cache_zalloc(scst_cmd_cachep, gfp_mask); if (cmd == NULL) { TRACE(TRACE_OUT_OF_MEM, "%s", "Allocation of scst_cmd failed"); goto out; } rc = scst_pre_init_cmd(cmd, cdb, cdb_len, gfp_mask); if (unlikely(rc != 0)) goto out_free; out: TRACE_EXIT(); return cmd; out_free: kmem_cache_free(scst_cmd_cachep, cmd); cmd = NULL; goto out; } static void scst_destroy_cmd(struct scst_cmd *cmd) { bool pre_alloced = cmd->pre_alloced; TRACE_ENTRY(); TRACE_DBG("Destroying cmd %p", cmd); scst_sess_put(cmd->sess); /* * At this point tgt_dev can be dead, but the pointer remains non-NULL */ if (likely(cmd->tgt_dev != NULL)) scst_put(cmd->cpu_cmd_counter); EXTRACHECKS_BUG_ON(cmd->pre_alloced && cmd->internal); if ((cmd->tgtt->on_free_cmd != NULL) && likely(!cmd->internal)) { TRACE_DBG("Calling target's on_free_cmd(%p)", cmd); cmd->tgtt->on_free_cmd(cmd); TRACE_DBG("%s", "Target's on_free_cmd() returned"); } /* At this point cmd can be already freed! */ if (!pre_alloced) kmem_cache_free(scst_cmd_cachep, cmd); TRACE_EXIT(); return; } /* No locks */ void scst_stpg_del_unblock_next(struct scst_cmd *cmd) { struct scst_cmd *c; TRACE_ENTRY(); spin_lock_irq(&scst_global_stpg_list_lock); EXTRACHECKS_BUG_ON(!cmd->cmd_on_global_stpg_list); TRACE_DBG("STPG cmd %p done: unblocking next", cmd); list_del(&cmd->global_stpg_list_entry); cmd->cmd_on_global_stpg_list = 0; if (list_empty(&scst_global_stpg_list)) { TRACE_DBG("No more STPG commands to unblock"); spin_unlock_irq(&scst_global_stpg_list_lock); goto out; } c = list_first_entry(&scst_global_stpg_list, typeof(*c), global_stpg_list_entry); spin_unlock_irq(&scst_global_stpg_list_lock); spin_lock_bh(&c->dev->dev_lock); if (!c->cmd_global_stpg_blocked) { TRACE_DBG("STPG cmd %p is not cmd_global_stpg_blocked", c); spin_unlock_bh(&c->dev->dev_lock); goto out; } TRACE_BLOCK("Unblocking serialized STPG cmd %p", c); list_del(&c->blocked_cmd_list_entry); c->cmd_global_stpg_blocked = 0; spin_unlock_bh(&c->dev->dev_lock); spin_lock_irq(&c->cmd_threads->cmd_list_lock); list_add(&c->cmd_list_entry, &c->cmd_threads->active_cmd_list); wake_up(&c->cmd_threads->cmd_list_waitQ); spin_unlock_irq(&c->cmd_threads->cmd_list_lock); out: TRACE_EXIT(); return; } EXPORT_SYMBOL_GPL(scst_stpg_del_unblock_next); /* No locks supposed to be held */ void scst_free_cmd(struct scst_cmd *cmd) { int destroy = 1; TRACE_ENTRY(); TRACE_DBG("Freeing cmd %p (tag %llu)", cmd, (unsigned long long int)cmd->tag); if (unlikely(test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags))) TRACE_MGMT_DBG("Freeing aborted cmd %p", cmd); EXTRACHECKS_BUG_ON(cmd->unblock_dev || cmd->dec_on_dev_needed || cmd->on_dev_exec_list); /* * Target driver can already free sg buffer before calling * scst_tgt_cmd_done(). E.g., scst_local has to do that. */ if (!cmd->tgt_i_data_buf_alloced) scst_check_restore_sg_buff(cmd); if (likely(cmd->dev != NULL)) { struct scst_dev_type *devt = cmd->devt; if (devt->on_free_cmd != NULL) { TRACE_DBG("Calling dev handler %s on_free_cmd(%p)", devt->name, cmd); devt->on_free_cmd(cmd); TRACE_DBG("Dev handler %s on_free_cmd() returned", devt->name); } } scst_release_space(cmd); if (unlikely(cmd->sense != NULL)) { TRACE_MEM("Releasing sense %p (cmd %p)", cmd->sense, cmd); mempool_free(cmd->sense, scst_sense_mempool); cmd->sense = NULL; } if (likely(cmd->tgt_dev != NULL)) { EXTRACHECKS_BUG_ON(cmd->sn_set && !cmd->out_of_sn && !test_bit(SCST_CMD_INC_EXPECTED_SN_PASSED, &cmd->cmd_flags)); if (unlikely(cmd->out_of_sn)) { destroy = test_and_set_bit(SCST_CMD_CAN_BE_DESTROYED, &cmd->cmd_flags); TRACE_SN("Out of SN cmd %p (tag %llu, sn %d), " "destroy=%d", cmd, (unsigned long long int)cmd->tag, cmd->sn, destroy); } } if (unlikely(cmd->op_flags & SCST_DESCRIPTORS_BASED)) scst_free_descriptors(cmd); if (cmd->cdb != cmd->cdb_buf) kfree(cmd->cdb); if (likely(destroy)) scst_destroy_cmd(cmd); TRACE_EXIT(); return; } /* No locks supposed to be held. */ void scst_check_retries(struct scst_tgt *tgt) { int need_wake_up = 0; TRACE_ENTRY(); if (unlikely(tgt->retry_cmds > 0)) { struct scst_cmd *c, *tc; unsigned long flags; TRACE_RETRY("Checking retry cmd list (retry_cmds %d)", tgt->retry_cmds); spin_lock_irqsave(&tgt->tgt_lock, flags); list_for_each_entry_safe(c, tc, &tgt->retry_cmd_list, cmd_list_entry) { tgt->retry_cmds--; TRACE_RETRY("Moving retry cmd %p to head of active " "cmd list (retry_cmds left %d)", c, tgt->retry_cmds); spin_lock(&c->cmd_threads->cmd_list_lock); list_move(&c->cmd_list_entry, &c->cmd_threads->active_cmd_list); wake_up(&c->cmd_threads->cmd_list_waitQ); spin_unlock(&c->cmd_threads->cmd_list_lock); need_wake_up++; if (need_wake_up >= 20) /* "slow start" */ break; } spin_unlock_irqrestore(&tgt->tgt_lock, flags); } TRACE_EXIT(); return; } static void scst_tgt_retry_timer_fn(unsigned long arg) { struct scst_tgt *tgt = (struct scst_tgt *)arg; unsigned long flags; TRACE_RETRY("Retry timer expired (retry_cmds %d)", tgt->retry_cmds); spin_lock_irqsave(&tgt->tgt_lock, flags); tgt->retry_timer_active = 0; spin_unlock_irqrestore(&tgt->tgt_lock, flags); scst_check_retries(tgt); spin_lock_irqsave(&tgt->tgt_lock, flags); if ((tgt->retry_cmds > 0) && !tgt->retry_timer_active) { TRACE_DBG("Reactivating retry timer for tgt %p", tgt); tgt->retry_timer.expires = jiffies + SCST_TGT_RETRY_TIMEOUT; add_timer(&tgt->retry_timer); tgt->retry_timer_active = 1; } spin_unlock_irqrestore(&tgt->tgt_lock, flags); TRACE_EXIT(); return; } struct scst_mgmt_cmd *scst_alloc_mgmt_cmd(gfp_t gfp_mask) { struct scst_mgmt_cmd *mcmd; TRACE_ENTRY(); mcmd = mempool_alloc(scst_mgmt_mempool, gfp_mask); if (mcmd == NULL) { PRINT_CRIT_ERROR("%s", "Allocation of management command " "failed, some commands and their data could leak"); goto out; } memset(mcmd, 0, sizeof(*mcmd)); mcmd->status = SCST_MGMT_STATUS_SUCCESS; out: TRACE_EXIT(); return mcmd; } void scst_free_mgmt_cmd(struct scst_mgmt_cmd *mcmd) { unsigned long flags; TRACE_ENTRY(); spin_lock_irqsave(&mcmd->sess->sess_list_lock, flags); atomic_dec(&mcmd->sess->sess_cmd_count); spin_unlock_irqrestore(&mcmd->sess->sess_list_lock, flags); scst_sess_put(mcmd->sess); if ((mcmd->mcmd_tgt_dev != NULL) || mcmd->scst_get_called) scst_put(mcmd->cpu_cmd_counter); mempool_free(mcmd, scst_mgmt_mempool); TRACE_EXIT(); return; } static bool scst_on_sg_tablesize_low(struct scst_cmd *cmd, bool out) { bool res; int sg_cnt = out ? cmd->out_sg_cnt : cmd->sg_cnt; static int ll; struct scst_tgt_dev *tgt_dev = cmd->tgt_dev; TRACE_ENTRY(); if (sg_cnt > cmd->tgt->sg_tablesize) { /* It's the target's side business */ goto failed; } if (cmd->devt->on_sg_tablesize_low == NULL) goto failed; res = cmd->devt->on_sg_tablesize_low(cmd); TRACE_DBG("on_sg_tablesize_low(%p) returned %d", cmd, res); out: TRACE_EXIT_RES(res); return res; failed: res = false; if ((ll < 10) || TRACING_MINOR()) { PRINT_INFO("Unable to complete command due to SG IO count " "limitation (%srequested %d, available %d, tgt lim %d)", out ? "OUT buffer, " : "", cmd->sg_cnt, tgt_dev->max_sg_cnt, cmd->tgt->sg_tablesize); ll++; } goto out; } static void scst_restore_dif_sg(struct scst_cmd *cmd) { int left = cmd->bufflen; struct scatterlist *sg = cmd->dif_sg; TRACE_ENTRY(); if (!cmd->dif_sg_normalized) goto out; do { sg->length = min_t(int, PAGE_SIZE, left); left -= sg->length; TRACE_DBG("DIF sg %p, restored len %d (left %d)", sg, sg->length, left); /* sg might be last here */ sg = sg_next_inline(sg); } while (left > 0); out: TRACE_EXIT(); return; } int scst_alloc_space(struct scst_cmd *cmd) { gfp_t gfp_mask; int res = -ENOMEM; int atomic = scst_cmd_atomic(cmd); int flags; struct scst_tgt_dev *tgt_dev = cmd->tgt_dev; TRACE_ENTRY(); gfp_mask = tgt_dev->tgt_dev_gfp_mask | (atomic ? GFP_ATOMIC : cmd->cmd_gfp_mask); flags = atomic ? SGV_POOL_NO_ALLOC_ON_CACHE_MISS : 0; if (cmd->no_sgv) flags |= SGV_POOL_ALLOC_NO_CACHED; cmd->sg = sgv_pool_alloc(tgt_dev->pools[raw_smp_processor_id()], cmd->bufflen, gfp_mask, flags, &cmd->sg_cnt, &cmd->sgv, &cmd->dev->dev_mem_lim, NULL); if (unlikely(cmd->sg == NULL)) goto out; if (unlikely(cmd->sg_cnt > tgt_dev->max_sg_cnt)) if (!scst_on_sg_tablesize_low(cmd, false)) goto out_sg_free; if ((scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions)) != SCST_DIF_ACTION_NONE) || (scst_get_dif_action(scst_get_dev_dif_actions(cmd->cmd_dif_actions)) != SCST_DIF_ACTION_NONE)) { int dif_bufflen; bool same_layout; same_layout = tgt_dev->hw_dif_same_sg_layout_required; if (!same_layout) dif_bufflen = __scst_cmd_get_bufflen_dif(cmd); else dif_bufflen = cmd->bufflen; cmd->dif_sg = sgv_pool_alloc(tgt_dev->pools[raw_smp_processor_id()], dif_bufflen, gfp_mask, flags, &cmd->dif_sg_cnt, &cmd->dif_sgv, &cmd->dev->dev_mem_lim, NULL); if (unlikely(cmd->dif_sg == NULL)) goto out_sg_free; if (same_layout) { int left = dif_bufflen; struct scatterlist *sgd = cmd->sg; struct scatterlist *sgt = cmd->dif_sg; int block_shift = cmd->dev->block_shift; EXTRACHECKS_BUG_ON(left != cmd->bufflen); do { left -= sgt->length; sgt->length = (sgd->length >> block_shift) << SCST_DIF_TAG_SHIFT; TRACE_SG("sgt %p, new len %d", sgt, sgt->length); /* sgd/sgt might be last here */ sgd = sg_next_inline(sgd); sgt = sg_next_inline(sgt); } while (left > 0); cmd->dif_sg_normalized = 1; } } if (cmd->data_direction != SCST_DATA_BIDI) goto success; cmd->out_sg = sgv_pool_alloc(tgt_dev->pools[raw_smp_processor_id()], cmd->out_bufflen, gfp_mask, flags, &cmd->out_sg_cnt, &cmd->out_sgv, &cmd->dev->dev_mem_lim, NULL); if (unlikely(cmd->out_sg == NULL)) goto out_dif_sg_free; if (unlikely(cmd->out_sg_cnt > tgt_dev->max_sg_cnt)) if (!scst_on_sg_tablesize_low(cmd, true)) goto out_out_sg_free; success: res = 0; out: TRACE_EXIT(); return res; out_out_sg_free: sgv_pool_free(cmd->out_sgv, &cmd->dev->dev_mem_lim); cmd->out_sgv = NULL; cmd->out_sg = NULL; cmd->out_sg_cnt = 0; out_dif_sg_free: if (cmd->dif_sgv != NULL) { scst_restore_dif_sg(cmd); sgv_pool_free(cmd->dif_sgv, &cmd->dev->dev_mem_lim); cmd->dif_sgv = NULL; cmd->dif_sg = NULL; cmd->dif_sg_cnt = 0; } out_sg_free: sgv_pool_free(cmd->sgv, &cmd->dev->dev_mem_lim); cmd->sgv = NULL; cmd->sg = NULL; cmd->sg_cnt = 0; goto out; } static void scst_release_space(struct scst_cmd *cmd) { TRACE_ENTRY(); if (cmd->sgv == NULL) { if ((cmd->sg != NULL) && !(cmd->tgt_i_data_buf_alloced || cmd->dh_data_buf_alloced)) { TRACE_MEM("Freeing sg %p for cmd %p (cnt %d)", cmd->sg, cmd, cmd->sg_cnt); scst_free_sg(cmd->sg, cmd->sg_cnt); goto out_zero; } else goto out; } if (cmd->tgt_i_data_buf_alloced || cmd->dh_data_buf_alloced) { TRACE_MEM("%s", "*data_buf_alloced set, returning"); goto out; } if (cmd->out_sgv != NULL) { sgv_pool_free(cmd->out_sgv, &cmd->dev->dev_mem_lim); cmd->out_sgv = NULL; cmd->out_sg_cnt = 0; cmd->out_sg = NULL; cmd->out_bufflen = 0; } if (cmd->dif_sgv != NULL) { scst_restore_dif_sg(cmd); sgv_pool_free(cmd->dif_sgv, &cmd->dev->dev_mem_lim); } sgv_pool_free(cmd->sgv, &cmd->dev->dev_mem_lim); out_zero: cmd->sgv = NULL; cmd->sg_cnt = 0; cmd->sg = NULL; cmd->dif_sgv = NULL; cmd->dif_sg = NULL; cmd->dif_sg_cnt = 0; cmd->bufflen = 0; cmd->data_len = 0; out: TRACE_EXIT(); return; } #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) struct blk_kern_sg_work { atomic_t bios_inflight; struct sg_table sg_table; struct scatterlist *src_sgl; }; static void blk_free_kern_sg_work(struct blk_kern_sg_work *bw) { struct sg_table *sgt = &bw->sg_table; struct scatterlist *sg; struct page *pg; int i; for_each_sg(sgt->sgl, sg, sgt->orig_nents, i) { pg = sg_page(sg); if (pg == NULL) break; __free_page(pg); } sg_free_table(sgt); kfree(bw); return; } #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) static void blk_bio_map_kern_endio(struct bio *bio, int err) { #else static void blk_bio_map_kern_endio(struct bio *bio) { int err = bio->bi_error; #endif struct blk_kern_sg_work *bw = bio->bi_private; if (bw != NULL) { /* Decrement the bios in processing and, if zero, free */ BUG_ON(atomic_read(&bw->bios_inflight) <= 0); if (atomic_dec_and_test(&bw->bios_inflight)) { if (bio_data_dir(bio) == READ && err == 0) { unsigned long flags; local_irq_save(flags); /* to protect KMs */ sg_copy(bw->src_sgl, bw->sg_table.sgl, 0, 0 #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) , KM_BIO_DST_IRQ, KM_BIO_SRC_IRQ #endif ); local_irq_restore(flags); } blk_free_kern_sg_work(bw); } } bio_put(bio); return; } #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31) /* * See also patch "block: Add blk_make_request(), takes bio, returns a * request" (commit 79eb63e9e5875b84341a3a05f8e6ae9cdb4bb6f6). */ static struct request *blk_make_request(struct request_queue *q, struct bio *bio, gfp_t gfp_mask) { struct request *rq = blk_get_request(q, bio_data_dir(bio), gfp_mask); if (unlikely(!rq)) return ERR_PTR(-ENOMEM); rq->cmd_type = REQ_TYPE_BLOCK_PC; for ( ; bio; bio = bio->bi_next) { struct bio *bounce_bio = bio; int ret; blk_queue_bounce(q, &bounce_bio); ret = blk_rq_append_bio(q, rq, bounce_bio); if (unlikely(ret)) { blk_put_request(rq); return ERR_PTR(ret); } } return rq; } #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31) */ /* * Copy an sg-list. This function is related to bio_copy_kern() but duplicates * an sg-list instead of creating a bio out of a single kernel address range. */ static struct blk_kern_sg_work *blk_copy_kern_sg(struct request_queue *q, struct scatterlist *sgl, int nents, gfp_t gfp_mask, bool reading) { int res = 0, i; struct scatterlist *sg; struct scatterlist *new_sgl; int new_sgl_nents; size_t len = 0, to_copy; struct blk_kern_sg_work *bw; res = -ENOMEM; bw = kzalloc(sizeof(*bw), gfp_mask); if (bw == NULL) goto err; bw->src_sgl = sgl; for_each_sg(sgl, sg, nents, i) len += sg->length; to_copy = len; new_sgl_nents = PFN_UP(len); res = sg_alloc_table(&bw->sg_table, new_sgl_nents, gfp_mask); if (res != 0) goto err_free_bw; new_sgl = bw->sg_table.sgl; res = -ENOMEM; for_each_sg(new_sgl, sg, new_sgl_nents, i) { struct page *pg; pg = alloc_page(q->bounce_gfp | gfp_mask); if (pg == NULL) goto err_free_table; sg_assign_page(sg, pg); sg->length = min_t(size_t, PAGE_SIZE, len); len -= PAGE_SIZE; } if (!reading) { /* * We need to limit amount of copied data to to_copy, because * sgl might have the last element in sgl not marked as last in * SG chaining. */ sg_copy(new_sgl, sgl, 0, to_copy #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) , KM_USER0, KM_USER1 #endif ); } out: return bw; err_free_table: sg_free_table(&bw->sg_table); err_free_bw: blk_free_kern_sg_work(bw); err: sBUG_ON(res == 0); bw = ERR_PTR(res); goto out; } #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28) static void bio_kmalloc_destructor(struct bio *bio) { kfree(bio->bi_io_vec); kfree(bio); } #endif #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0) static struct request *blk_make_request(struct request_queue *q, struct bio *bio, gfp_t gfp_mask) { struct request *rq = blk_get_request(q, bio_data_dir(bio), gfp_mask); if (IS_ERR(rq)) return rq; #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) scsi_req_init(rq); #else blk_rq_set_block_pc(rq); #endif for_each_bio(bio) { struct bio *bounce_bio = bio; int ret; blk_queue_bounce(q, &bounce_bio); ret = blk_rq_append_bio(rq, bounce_bio); if (unlikely(ret)) { blk_put_request(rq); return ERR_PTR(ret); } } return rq; } #endif /* __blk_map_kern_sg - map kernel data to a request for REQ_TYPE_BLOCK_PC */ static struct request *__blk_map_kern_sg(struct request_queue *q, struct scatterlist *sgl, int nents, struct blk_kern_sg_work *bw, gfp_t gfp_mask, bool reading) { struct request *rq; int max_nr_vecs, i; size_t tot_len; bool need_new_bio; struct scatterlist *sg; struct bio *bio = NULL, *hbio = NULL, *tbio = NULL; int bios; if (unlikely(sgl == NULL || sgl->length == 0 || nents <= 0)) { WARN_ON_ONCE(true); rq = ERR_PTR(-EINVAL); goto out; } /* * Restrict bio size to a single page to minimize the probability that * bio allocation fails. */ max_nr_vecs = min_t(int, (PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec), BIO_MAX_PAGES); TRACE_DBG("max_nr_vecs %d, nents %d, reading %d", max_nr_vecs, nents, reading); need_new_bio = true; tot_len = 0; bios = 0; for_each_sg(sgl, sg, nents, i) { struct page *page = sg_page(sg); void *page_addr = page_address(page); size_t len = sg->length, l; size_t offset = sg->offset; tot_len += len; /* * Each segment must be DMA-aligned and must not reside not on * the stack. The last segment may have unaligned length as * long as the total length satisfies the DMA padding * alignment requirements. */ if (i == nents - 1) l = 0; else l = len; TRACE_DBG("i %d, len %zd, tot_len %zd, l %zd, offset %zd", i, len, tot_len, l, offset); if (((sg->offset | l) & queue_dma_alignment(q)) || (page_addr && object_is_on_stack(page_addr + sg->offset))) { rq = ERR_PTR(-EINVAL); goto out_free_bios; } while (len > 0) { size_t bytes; int rc; if (need_new_bio) { #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28) bio = bio_alloc_bioset(gfp_mask, max_nr_vecs, NULL); if (bio) bio->bi_destructor = bio_kmalloc_destructor; #else bio = bio_kmalloc(gfp_mask, max_nr_vecs); #endif if (bio == NULL) { rq = ERR_PTR(-ENOMEM); goto out_free_bios; } if (!reading) #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36) bio->bi_rw |= 1 << BIO_RW; #elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0) bio->bi_rw |= REQ_WRITE; #else bio_set_op_attrs(bio, REQ_OP_WRITE, 0); #endif bios++; bio->bi_private = bw; bio->bi_end_io = blk_bio_map_kern_endio; TRACE_DBG("new bio %p, bios %d", bio, bios); if (hbio == NULL) hbio = bio; else tbio->bi_next = bio; tbio = bio; } bytes = min_t(size_t, len, PAGE_SIZE - offset); TRACE_DBG("len %zd, bytes %zd, offset %zd", len, bytes, offset); rc = bio_add_pc_page(q, bio, page, bytes, offset); if (rc < bytes) { if (unlikely(need_new_bio || rc < 0)) { rq = ERR_PTR(rc < 0 ? rc : -EIO); goto out_free_bios; } else { need_new_bio = true; len -= rc; offset += rc; } } else { need_new_bio = false; offset = 0; len -= bytes; page = nth_page(page, 1); } } } if (hbio == NULL) { rq = ERR_PTR(-EINVAL); goto out_free_bios; } /* Total length must satisfy DMA padding alignment */ if ((tot_len & q->dma_pad_mask) && bw != NULL) { rq = ERR_PTR(-EINVAL); goto out_free_bios; } rq = blk_make_request(q, hbio, gfp_mask); if (unlikely(IS_ERR(rq))) goto out_free_bios; #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) /* * See also patch "block: add blk_rq_set_block_pc()" (commit * f27b087b81b7). */ rq->cmd_type = REQ_TYPE_BLOCK_PC; #endif if (bw != NULL) { atomic_set(&bw->bios_inflight, bios); #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) /* * See also patch "block: split out request-only flags into a * new namespace" (commit e806402130c9). */ rq->cmd_flags |= REQ_COPY_USER; #else rq->rq_flags |= RQF_COPY_USER; #endif } out: return rq; out_free_bios: while (hbio != NULL) { bio = hbio; hbio = hbio->bi_next; bio_put(bio); } goto out; } /** * blk_map_kern_sg - map kernel data to a request for REQ_TYPE_BLOCK_PC * @rq: request to fill * @sgl: area to map * @nents: number of elements in @sgl * @gfp: memory allocation flags * * Description: * Data will be mapped directly if possible. Otherwise a bounce * buffer will be used. */ static struct request *blk_map_kern_sg(struct request_queue *q, struct scatterlist *sgl, int nents, gfp_t gfp, bool reading) { struct request *rq; if (!sgl) { rq = blk_get_request(q, reading ? READ : WRITE, gfp); if (unlikely(!rq)) return ERR_PTR(-ENOMEM); #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) scsi_req_init(rq); #else rq->cmd_type = REQ_TYPE_BLOCK_PC; #endif goto out; } rq = __blk_map_kern_sg(q, sgl, nents, NULL, gfp, reading); if (unlikely(IS_ERR(rq))) { struct blk_kern_sg_work *bw; bw = blk_copy_kern_sg(q, sgl, nents, gfp, reading); if (unlikely(IS_ERR(bw))) { rq = ERR_PTR(PTR_ERR(bw)); goto out; } rq = __blk_map_kern_sg(q, bw->sg_table.sgl, bw->sg_table.nents, bw, gfp, reading); if (IS_ERR(rq)) { blk_free_kern_sg_work(bw); goto out; } } out: return rq; } #endif #if !defined(SCSI_EXEC_REQ_FIFO_DEFINED) /* * Can switch to the next dst_sg element, so, to copy to strictly only * one dst_sg element, it must be either last in the chain, or * copy_len == dst_sg->length. */ static int sg_copy_elem(struct scatterlist **pdst_sg, size_t *pdst_len, size_t *pdst_offs, struct scatterlist *src_sg, #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) size_t copy_len, enum km_type d_km_type, enum km_type s_km_type) #else size_t copy_len) #endif { int res = 0; struct scatterlist *dst_sg; size_t src_len, dst_len, src_offs, dst_offs; struct page *src_page, *dst_page; dst_sg = *pdst_sg; dst_len = *pdst_len; dst_offs = *pdst_offs; dst_page = sg_page(dst_sg); src_page = sg_page(src_sg); src_len = src_sg->length; src_offs = src_sg->offset; do { void *saddr, *daddr; size_t n; #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) saddr = kmap_atomic(src_page + (src_offs >> PAGE_SHIFT), s_km_type) + (src_offs & ~PAGE_MASK); daddr = kmap_atomic(dst_page + (dst_offs >> PAGE_SHIFT), d_km_type) + (dst_offs & ~PAGE_MASK); #else saddr = kmap_atomic(src_page + (src_offs >> PAGE_SHIFT)) + (src_offs & ~PAGE_MASK); daddr = kmap_atomic(dst_page + (dst_offs >> PAGE_SHIFT)) + (dst_offs & ~PAGE_MASK); #endif if (((src_offs & ~PAGE_MASK) == 0) && ((dst_offs & ~PAGE_MASK) == 0) && (src_len >= PAGE_SIZE) && (dst_len >= PAGE_SIZE) && (copy_len >= PAGE_SIZE)) { copy_page(daddr, saddr); n = PAGE_SIZE; } else { n = min_t(size_t, PAGE_SIZE - (dst_offs & ~PAGE_MASK), PAGE_SIZE - (src_offs & ~PAGE_MASK)); n = min(n, src_len); n = min(n, dst_len); n = min_t(size_t, n, copy_len); memcpy(daddr, saddr, n); } dst_offs += n; src_offs += n; #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) kunmap_atomic(saddr, s_km_type); kunmap_atomic(daddr, d_km_type); #else kunmap_atomic(saddr); kunmap_atomic(daddr); #endif res += n; copy_len -= n; if (copy_len == 0) goto out; src_len -= n; dst_len -= n; if (dst_len == 0) { dst_sg = sg_next_inline(dst_sg); if (dst_sg == NULL) goto out; dst_page = sg_page(dst_sg); dst_len = dst_sg->length; dst_offs = dst_sg->offset; } } while (src_len > 0); out: *pdst_sg = dst_sg; *pdst_len = dst_len; *pdst_offs = dst_offs; return res; } /** * sg_copy - copy one SG vector to another * @dst_sg: destination SG * @src_sg: source SG * @nents_to_copy: maximum number of entries to copy * @copy_len: maximum amount of data to copy. If 0, then copy all. * @d_km_type: kmap_atomic type for the destination SG * @s_km_type: kmap_atomic type for the source SG * * Description: * Data from the source SG vector will be copied to the destination SG * vector. End of the vectors will be determined by sg_next() returning * NULL. Returns number of bytes copied. */ static int sg_copy(struct scatterlist *dst_sg, struct scatterlist *src_sg, #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) int nents_to_copy, size_t copy_len, enum km_type d_km_type, enum km_type s_km_type) #else int nents_to_copy, size_t copy_len) #endif { int res = 0; size_t dst_len, dst_offs; if (copy_len == 0) copy_len = 0x7FFFFFFF; /* copy all */ if (nents_to_copy == 0) nents_to_copy = 0x7FFFFFFF; /* copy all */ dst_len = dst_sg->length; dst_offs = dst_sg->offset; do { int copied = sg_copy_elem(&dst_sg, &dst_len, &dst_offs, #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) src_sg, copy_len, d_km_type, s_km_type); #else src_sg, copy_len); #endif copy_len -= copied; res += copied; if ((copy_len == 0) || (dst_sg == NULL)) goto out; nents_to_copy--; if (nents_to_copy == 0) goto out; src_sg = sg_next_inline(src_sg); } while (src_sg != NULL); out: return res; } #endif /* !defined(SCSI_EXEC_REQ_FIFO_DEFINED) */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) static void scsi_end_async(struct request *req, int error) { struct scsi_io_context *sioc = req->end_io_data; TRACE_DBG("sioc %p, cmd %p", sioc, sioc->data); #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0) lockdep_assert_held(req->q->queue_lock); #else if (!req->q->mq_ops) lockdep_assert_held(req->q->queue_lock); #endif if (sioc->done) { int result, resid_len; #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0) result = scsi_req(req)->result; #else result = req->errors; #endif #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) resid_len = scsi_req(req)->resid_len; #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31) resid_len = req->resid_len; #else /* * A quote from commit c3a4d78c580d: "rq->data_len served two * purposes - the length of data buffer on issue and the * residual count on completion." */ resid_len = req->data_len; #endif sioc->done(sioc->data, sioc->sense, result, resid_len); } kmem_cache_free(scsi_io_context_cache, sioc); __blk_put_request(req->q, req); return; } /** * scst_scsi_exec_async - executes a SCSI command in pass-through mode * @cmd: scst command * @data: pointer passed to done() as "data" * @done: callback function when done */ int scst_scsi_exec_async(struct scst_cmd *cmd, void *data, void (*done)(void *data, char *sense, int result, int resid)) { int res = 0; struct request_queue *q = cmd->dev->scsi_dev->request_queue; struct request *rq; #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) struct scsi_request *req; #else struct request *req; #endif struct scsi_io_context *sioc; bool reading = !(cmd->data_direction & SCST_DATA_WRITE); gfp_t gfp = cmd->cmd_gfp_mask; int cmd_len = cmd->cdb_len; sioc = kmem_cache_zalloc(scsi_io_context_cache, gfp); if (sioc == NULL) { res = -ENOMEM; goto out; } if (cmd->data_direction == SCST_DATA_BIDI) { struct request *next_rq; if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { res = -EOPNOTSUPP; goto out_free_sioc; } rq = blk_map_kern_sg(q, cmd->out_sg, cmd->out_sg_cnt, gfp, reading); if (IS_ERR(rq)) { res = PTR_ERR(rq); TRACE_DBG("blk_map_kern_sg() failed: %d", res); goto out_free_sioc; } next_rq = blk_map_kern_sg(q, cmd->sg, cmd->sg_cnt, gfp, false); if (IS_ERR(next_rq)) { res = PTR_ERR(next_rq); TRACE_DBG("blk_map_kern_sg() failed: %d", res); goto out_free_unmap; } rq->next_rq = next_rq; } else { rq = blk_map_kern_sg(q, cmd->sg, cmd->sg_cnt, gfp, reading); if (IS_ERR(rq)) { res = PTR_ERR(rq); TRACE_DBG("blk_map_kern_sg() failed: %d", res); goto out_free_sioc; } } TRACE_DBG("sioc %p, cmd %p", sioc, cmd); sioc->data = data; sioc->done = done; #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) req = scsi_req(rq); #else req = rq; #endif req->cmd_len = cmd_len; if (req->cmd_len <= BLK_MAX_CDB) { memset(req->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */ memcpy(req->cmd, cmd->cdb, cmd->cdb_len); } else req->cmd = cmd->cdb; req->sense = sioc->sense; req->sense_len = sizeof(sioc->sense); rq->timeout = cmd->timeout; #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0) req->retries = cmd->retries; #else rq->retries = cmd->retries; #endif rq->end_io_data = sioc; #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35) rq->cmd_flags |= REQ_FAILFAST_MASK; #endif blk_execute_rq_nowait(rq->q, NULL, rq, (cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE), scsi_end_async); out: return res; out_free_unmap: { struct bio *bio = rq->bio, *b; while (bio) { b = bio; bio = bio->bi_next; #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) b->bi_end_io(b, res); #else b->bi_error = res; b->bi_end_io(b); #endif } } rq->bio = NULL; blk_put_request(rq); out_free_sioc: kmem_cache_free(scsi_io_context_cache, sioc); goto out; } EXPORT_SYMBOL(scst_scsi_exec_async); #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) */ /* * Can switch to the next dst_sg element, so, to cmp to strictly only * one dst_sg element, it must be either last in the chain, or * cmp_len == dst_sg->length. */ static int sg_cmp_elem(struct scatterlist **pdst_sg, size_t *pdst_len, size_t *pdst_offs, struct scatterlist *src_sg, size_t cmp_len, int *miscompare_offs, #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) enum km_type d_km_type, enum km_type s_km_type, #endif bool *cmp_res) { int res = 0; struct scatterlist *dst_sg; size_t src_len, dst_len, src_offs, dst_offs; struct page *src_page, *dst_page; void *saddr, *daddr; *cmp_res = true; dst_sg = *pdst_sg; dst_len = *pdst_len; dst_offs = *pdst_offs; dst_page = sg_page(dst_sg); src_page = sg_page(src_sg); src_len = src_sg->length; src_offs = src_sg->offset; do { size_t n; int rc; #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) saddr = kmap_atomic(src_page + (src_offs >> PAGE_SHIFT), s_km_type) + (src_offs & ~PAGE_MASK); daddr = kmap_atomic(dst_page + (dst_offs >> PAGE_SHIFT), d_km_type) + (dst_offs & ~PAGE_MASK); #else saddr = kmap_atomic(src_page + (src_offs >> PAGE_SHIFT)) + (src_offs & ~PAGE_MASK); daddr = kmap_atomic(dst_page + (dst_offs >> PAGE_SHIFT)) + (dst_offs & ~PAGE_MASK); #endif if (((src_offs & ~PAGE_MASK) == 0) && ((dst_offs & ~PAGE_MASK) == 0) && (src_len >= PAGE_SIZE) && (dst_len >= PAGE_SIZE) && (cmp_len >= PAGE_SIZE)) n = PAGE_SIZE; else { n = min_t(size_t, PAGE_SIZE - (dst_offs & ~PAGE_MASK), PAGE_SIZE - (src_offs & ~PAGE_MASK)); n = min(n, src_len); n = min(n, dst_len); n = min_t(size_t, n, cmp_len); } /* Optimized for rare miscompares */ rc = memcmp(daddr, saddr, n); if (rc != 0) { *cmp_res = false; if (miscompare_offs != NULL) { int i, len = n; unsigned long saddr_int = (unsigned long)saddr; unsigned long daddr_int = (unsigned long)daddr; int align_size = sizeof(unsigned long long); int align_mask = align_size-1; *miscompare_offs = -1; if (((saddr_int & align_mask) == 0) && ((daddr_int & align_mask) == 0) && ((len & align_mask) == 0)) { /* Fast path: both buffers and len aligned */ unsigned long long *s = saddr; unsigned long long *d = daddr; EXTRACHECKS_BUG_ON(len % align_size != 0); len /= align_size; for (i = 0; i < len; i++) { if (s[i] != d[i]) { uint8_t *s8 = (uint8_t *)&s[i]; uint8_t *d8 = (uint8_t *)&d[i]; int j; for (j = 0; j < align_size; j++) { if (s8[j] != d8[j]) { *miscompare_offs = i * align_size + j; break; } } break; } } } else { uint8_t *s = saddr; uint8_t *d = daddr; for (i = 0; i < len; i++) { if (s[i] != d[i]) { *miscompare_offs = i; break; } } } EXTRACHECKS_BUG_ON(*miscompare_offs == -1); } goto out_unmap; } dst_offs += n; src_offs += n; #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) kunmap_atomic(saddr, s_km_type); kunmap_atomic(daddr, d_km_type); #else kunmap_atomic(saddr); kunmap_atomic(daddr); #endif res += n; cmp_len -= n; if (cmp_len == 0) goto out; src_len -= n; dst_len -= n; if (dst_len == 0) { dst_sg = sg_next_inline(dst_sg); if (dst_sg == NULL) goto out; dst_page = sg_page(dst_sg); dst_len = dst_sg->length; dst_offs = dst_sg->offset; } } while (src_len > 0); out: *pdst_sg = dst_sg; *pdst_len = dst_len; *pdst_offs = dst_offs; return res; out_unmap: #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) kunmap_atomic(saddr, s_km_type); kunmap_atomic(daddr, d_km_type); #else kunmap_atomic(saddr); kunmap_atomic(daddr); #endif goto out; } /** * sg_cmp - compare 2 SG vectors * @dst_sg: SG 1 * @src_sg: SG 2 * @nents_to_cmp: maximum number of entries to compare * @cmp_len: maximum amount of data to compare. If 0, then compare all. * @miscompare_offs: offset of the first miscompare. Can be NULL. * @d_km_type: kmap_atomic type for SG 1 * @s_km_type: kmap_atomic type for SG 2 * * Description: * Data from the first SG vector will be compired with the second SG * vector. End of the vectors will be determined by sg_next() returning * NULL. Returns true if both vectors have identical data, false otherwise. * * Note! It ignores size of the vectors, so SGs with different size with * the same data in min(sg1_size, sg2_size) size will match! */ static bool sg_cmp(struct scatterlist *dst_sg, struct scatterlist *src_sg, int nents_to_cmp, size_t cmp_len, int *miscompare_offs #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) , enum km_type d_km_type, enum km_type s_km_type #endif ) { bool res = true; size_t dst_len, dst_offs; int compared_all = 0; TRACE_ENTRY(); TRACE_DBG("dst_sg %p, src_sg %p, nents_to_cmp %d, cmp_len %zd", dst_sg, src_sg, nents_to_cmp, cmp_len); if (cmp_len == 0) cmp_len = 0x7FFFFFFF; /* cmp all */ if (nents_to_cmp == 0) nents_to_cmp = 0x7FFFFFFF; /* cmp all */ dst_len = dst_sg->length; dst_offs = dst_sg->offset; do { int compared; TRACE_DBG("dst_sg %p, dst_len %zd, dst_offs %zd, src_sg %p, " "nents_to_cmp %d, cmp_len %zd, compared_all %d", dst_sg, dst_len, dst_offs, src_sg, nents_to_cmp, cmp_len, compared_all); compared = sg_cmp_elem(&dst_sg, &dst_len, &dst_offs, src_sg, cmp_len, miscompare_offs, #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) d_km_type, s_km_type, #endif &res); if (!res) { if (miscompare_offs != NULL) { *miscompare_offs += compared_all; TRACE_DBG("miscompare_offs %d", *miscompare_offs); } goto out; } cmp_len -= compared; compared_all += compared; if ((cmp_len == 0) || (dst_sg == NULL)) goto out; nents_to_cmp--; if (nents_to_cmp == 0) goto out; src_sg = sg_next_inline(src_sg); } while (src_sg != NULL); out: TRACE_EXIT_RES(res); return res; } /** * scst_copy_sg() - copy data between the command's SGs * * Copies data between cmd->tgt_i_sg and cmd->sg as well as * cmd->tgt_i_dif_sg and cmd->dif_sg in direction defined by * copy_dir parameter. */ void scst_copy_sg(struct scst_cmd *cmd, enum scst_sg_copy_dir copy_dir) { struct scatterlist *src_sg, *dst_sg; struct scatterlist *src_sg_dif, *dst_sg_dif; unsigned int to_copy, to_copy_dif; #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) int atomic = scst_cmd_atomic(cmd); #endif TRACE_ENTRY(); if (copy_dir == SCST_SG_COPY_FROM_TARGET) { if (cmd->data_direction != SCST_DATA_BIDI) { src_sg = cmd->tgt_i_sg; dst_sg = cmd->sg; to_copy = cmd->bufflen; src_sg_dif = cmd->tgt_i_dif_sg; dst_sg_dif = cmd->dif_sg; to_copy_dif = scst_cmd_get_bufflen_dif(cmd); } else { TRACE_MEM("BIDI cmd %p", cmd); src_sg = cmd->tgt_out_sg; dst_sg = cmd->out_sg; to_copy = cmd->out_bufflen; src_sg_dif = NULL; dst_sg_dif = NULL; to_copy_dif = 0; } } else { src_sg = cmd->sg; dst_sg = cmd->tgt_i_sg; to_copy = cmd->adjusted_resp_data_len; src_sg_dif = cmd->dif_sg; dst_sg_dif = cmd->tgt_i_dif_sg; to_copy_dif = scst_cmd_get_bufflen_dif(cmd); } TRACE_MEM("cmd %p, copy_dir %d, src_sg %p, dst_sg %p, to_copy %lld, " "src_sg_dif %p, dst_sg_dif %p, to_copy_dif %lld", cmd, copy_dir, src_sg, dst_sg, (long long)to_copy, src_sg_dif, dst_sg_dif, (long long)to_copy_dif); if (unlikely(src_sg == NULL) || unlikely(dst_sg == NULL) || unlikely(to_copy == 0)) { /* * It can happened, e.g., with scst_user for cmd with delay * alloc, which failed with Check Condition. */ goto out; } #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) sg_copy(dst_sg, src_sg, 0, to_copy, atomic ? KM_SOFTIRQ0 : KM_USER0, atomic ? KM_SOFTIRQ1 : KM_USER1); #else sg_copy(dst_sg, src_sg, 0, to_copy); #endif if ((src_sg_dif == NULL) || (dst_sg_dif == NULL) || (to_copy_dif == 0)) goto out; #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) sg_copy(dst_sg_dif, src_sg_dif, 0, to_copy_dif, atomic ? KM_SOFTIRQ0 : KM_USER0, atomic ? KM_SOFTIRQ1 : KM_USER1); #else sg_copy(dst_sg_dif, src_sg_dif, 0, to_copy_dif); #endif out: TRACE_EXIT(); return; } EXPORT_SYMBOL_GPL(scst_copy_sg); /** * scst_get_buf_full - return linear buffer for command * @cmd: scst command * @buf: pointer on the resulting pointer * * If the command's buffer >single page, it vmalloc() the needed area * and copies the buffer there. Returns length of the buffer or negative * error code otherwise. */ int scst_get_buf_full(struct scst_cmd *cmd, uint8_t **buf) { int res = 0; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(cmd->sg_buff_vmallocated); if (scst_get_buf_count(cmd) > 1) { int len; uint8_t *tmp_buf; int full_size; full_size = 0; len = scst_get_buf_first(cmd, &tmp_buf); while (len > 0) { full_size += len; scst_put_buf(cmd, tmp_buf); len = scst_get_buf_next(cmd, &tmp_buf); } #ifdef __COVERITY__ /* Help Coverity recognize that vmalloc(0) returns NULL. */ *buf = full_size ? vmalloc(full_size) : NULL; #else *buf = vmalloc(full_size); #endif if (*buf == NULL) { TRACE(TRACE_OUT_OF_MEM, "vmalloc() failed for opcode " "%s", scst_get_opcode_name(cmd)); res = -ENOMEM; goto out; } cmd->sg_buff_vmallocated = 1; if (scst_cmd_get_data_direction(cmd) == SCST_DATA_WRITE) { uint8_t *buf_ptr; buf_ptr = *buf; len = scst_get_buf_first(cmd, &tmp_buf); while (len > 0) { memcpy(buf_ptr, tmp_buf, len); buf_ptr += len; scst_put_buf(cmd, tmp_buf); len = scst_get_buf_next(cmd, &tmp_buf); } } res = full_size; } else res = scst_get_buf_first(cmd, buf); out: TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL(scst_get_buf_full); /** * scst_get_buf_full_sense - return linear buffer for command * @cmd: scst command * @buf: pointer on the resulting pointer * * Does the same as scst_get_buf_full(), but in case of error * additionally sets in cmd status code and sense. */ int scst_get_buf_full_sense(struct scst_cmd *cmd, uint8_t **buf) { int res = 0; TRACE_ENTRY(); res = scst_get_buf_full(cmd, buf); if (unlikely(res < 0)) { PRINT_ERROR("scst_get_buf_full() failed: %d", res); if (res == -ENOMEM) scst_set_busy(cmd); else scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_internal_failure)); goto out; } out: TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL(scst_get_buf_full_sense); /** * scst_put_buf_full - unmaps linear buffer for command * @cmd: scst command * @buf: pointer on the buffer to unmap * * Reverse operation for scst_get_buf_full()/scst_get_buf_full_sense(). * If the buffer was vmalloced(), it vfree() the buffer. */ void scst_put_buf_full(struct scst_cmd *cmd, uint8_t *buf) { TRACE_ENTRY(); if (buf == NULL) goto out; if (cmd->sg_buff_vmallocated) { if (scst_cmd_get_data_direction(cmd) == SCST_DATA_READ) { int len; uint8_t *tmp_buf, *buf_p; buf_p = buf; len = scst_get_buf_first(cmd, &tmp_buf); while (len > 0) { memcpy(tmp_buf, buf_p, len); buf_p += len; scst_put_buf(cmd, tmp_buf); len = scst_get_buf_next(cmd, &tmp_buf); } } cmd->sg_buff_vmallocated = 0; vfree(buf); } else scst_put_buf(cmd, buf); out: TRACE_EXIT(); return; } EXPORT_SYMBOL(scst_put_buf_full); static __be16 scst_dif_crc_fn(const void *data, unsigned int len) { #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27) return cpu_to_be16(crc_t10dif(data, len)); #else WARN_ON_ONCE(true); return 0; #endif } static __be16 scst_dif_ip_fn(const void *data, unsigned int len) { return (__force __be16)ip_compute_csum(data, len); } static int scst_verify_dif_type1(struct scst_cmd *cmd) { int res = 0; struct scst_device *dev = cmd->dev; enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions); int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT; struct scatterlist *tags_sg = NULL; uint8_t *buf, *tags_buf = NULL; const struct t10_pi_tuple *t = NULL; /* to silence compiler warning */ uint64_t lba = cmd->lba; int block_size = dev->block_size, block_shift = dev->block_shift; __be16 (*crc_fn)(const void *buffer, unsigned int len); TRACE_ENTRY(); EXTRACHECKS_BUG_ON(dev->dev_dif_type != 1); #ifdef CONFIG_SCST_EXTRACHECKS switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) { case SCST_DIF_ACTION_STRIP: case SCST_DIF_ACTION_PASS_CHECK: break; default: EXTRACHECKS_BUG_ON(1); break; } EXTRACHECKS_BUG_ON(checks == SCST_DIF_ACTION_NONE); #endif crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn; len = scst_get_buf_first(cmd, &buf); while (len > 0) { int i; uint8_t *cur_buf = buf; for (i = 0; i < (len >> block_shift); i++) { if (tags_buf == NULL) { tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len); EXTRACHECKS_BUG_ON(tags_len <= 0); TRACE_DBG("tags_buf %p", tags_buf); TRACE_BUFF_FLAG(TRACE_DEBUG, "Tags to verify", tags_buf, tags_len); t = (struct t10_pi_tuple *)tags_buf; } if (t->app_tag == SCST_DIF_NO_CHECK_ALL_APP_TAG) { TRACE_DBG("Skipping tag %lld (cmd %p)", (long long)lba, cmd); goto next; } if (checks & SCST_DIF_CHECK_APP_TAG) { if (t->app_tag != dev->dev_dif_static_app_tag) { PRINT_WARNING("APP TAG check failed, " "expected 0x%x, seeing " "0x%x (cmd %p (op %s), lba %lld, " "dev %s)", dev->dev_dif_static_app_tag, t->app_tag, cmd, scst_get_opcode_name(cmd), (long long)lba, dev->virt_name); scst_dif_acc_app_check_failed_scst(cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_logical_block_app_tag_check_failed)); res = -EIO; goto out_put; } } if (checks & SCST_DIF_CHECK_REF_TAG) { if (t->ref_tag != cpu_to_be32(lba & 0xFFFFFFFF)) { PRINT_WARNING("REF TAG check failed, " "expected 0x%x, seeing " "0x%x (cmd %p (op %s), lba %lld, " "dev %s)", cpu_to_be32(lba & 0xFFFFFFFF), t->ref_tag, cmd, scst_get_opcode_name(cmd), (long long)lba, dev->virt_name); scst_dif_acc_ref_check_failed_scst(cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_logical_block_ref_tag_check_failed)); res = -EIO; goto out_put; } } /* Skip CRC check for internal commands */ if ((checks & SCST_DIF_CHECK_GUARD_TAG) && !cmd->internal) { __be16 crc = crc_fn(cur_buf, block_size); if (t->guard_tag != crc) { PRINT_WARNING("GUARD TAG check failed, " "expected 0x%x, seeing 0x%x " "(cmd %p (op %s), lba %lld, " "dev %s)", crc, t->guard_tag, cmd, scst_get_opcode_name(cmd), (long long)lba, dev->virt_name); scst_dif_acc_guard_check_failed_scst(cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_logical_block_guard_check_failed)); res = -EIO; goto out_put; } } next: cur_buf += dev->block_size; lba++; t++; tags_len -= tag_size; if (tags_len == 0) { scst_put_dif_buf(cmd, tags_buf); tags_buf = NULL; } } scst_put_buf(cmd, buf); len = scst_get_buf_next(cmd, &buf); } EXTRACHECKS_BUG_ON(tags_buf != NULL); out: TRACE_EXIT_RES(res); return res; out_put: scst_put_buf(cmd, buf); scst_put_dif_buf(cmd, tags_buf); goto out; } #ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS static void scst_check_fail_ref_tag(struct scst_cmd *cmd) { enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions); if (((cmd->dev->dev_dif_mode & SCST_DIF_MODE_TGT) == 0) && (checks & SCST_DIF_CHECK_REF_TAG)) { TRACE(TRACE_SCSI|TRACE_MINOR, "No tgt dif_mode, failing " "cmd %p with ref tag check failed", cmd); scst_dif_acc_ref_check_failed_scst(cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_logical_block_ref_tag_check_failed)); } return; } static void scst_check_fail_guard_tag(struct scst_cmd *cmd) { enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions); if (((cmd->dev->dev_dif_mode & SCST_DIF_MODE_TGT) == 0) && (checks & SCST_DIF_CHECK_GUARD_TAG)) { TRACE(TRACE_SCSI|TRACE_MINOR, "No tgt dif_mode, failing " "cmd %p with guard tag check failed", cmd); scst_dif_acc_guard_check_failed_scst(cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_logical_block_guard_check_failed)); } return; } #endif static int scst_generate_dif_type1(struct scst_cmd *cmd) { int res = 0; struct scst_device *dev = cmd->dev; int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT; struct scatterlist *tags_sg = NULL; uint8_t *buf, *tags_buf = NULL; struct t10_pi_tuple *t = NULL; /* to silence compiler warning */ uint64_t lba = cmd->lba; int block_size = dev->block_size, block_shift = dev->block_shift; __be16 (*crc_fn)(const void *buffer, unsigned int len); TRACE_ENTRY(); EXTRACHECKS_BUG_ON(dev->dev_dif_type != 1); #ifdef CONFIG_SCST_EXTRACHECKS switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) { case SCST_DIF_ACTION_INSERT: break; default: EXTRACHECKS_BUG_ON(1); break; } #endif crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn; len = scst_get_buf_first(cmd, &buf); while (len > 0) { int i; uint8_t *cur_buf = buf; TRACE_DBG("len %d", len); for (i = 0; i < (len >> block_shift); i++) { TRACE_DBG("lba %lld, tags_len %d", (long long)lba, tags_len); if (tags_buf == NULL) { tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len); TRACE_DBG("tags_sg %p, tags_buf %p, tags_len %d", tags_sg, tags_buf, tags_len); EXTRACHECKS_BUG_ON(tags_len <= 0); t = (struct t10_pi_tuple *)tags_buf; } t->app_tag = dev->dev_dif_static_app_tag; t->ref_tag = cpu_to_be32(lba & 0xFFFFFFFF); t->guard_tag = crc_fn(cur_buf, block_size); #ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS switch (cmd->cmd_corrupt_dif_tag) { case 0: break; case 1: if (lba == cmd->lba) { if (cmd->cdb[1] & 0x80) { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting ref tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->ref_tag = cpu_to_be32(0xebfeedad); scst_check_fail_ref_tag(cmd); } else { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting guard tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->guard_tag = cpu_to_be16(0xebed); scst_check_fail_guard_tag(cmd); } } break; case 2: if (lba == (cmd->lba + 1)) { if (cmd->cdb[1] & 0x80) { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting ref tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->ref_tag = cpu_to_be32(0xebfeedad); scst_check_fail_ref_tag(cmd); } else { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting guard tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->guard_tag = cpu_to_be16(0xebed); scst_check_fail_guard_tag(cmd); } } break; case 3: if (lba == (cmd->lba + 2)) { if (cmd->cdb[1] & 0x80) { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting ref tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->ref_tag = cpu_to_be32(0xebfeedad); scst_check_fail_ref_tag(cmd); } else { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting guard tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->guard_tag = cpu_to_be16(0xebed); scst_check_fail_guard_tag(cmd); } } break; case 4: if (lba == (cmd->lba + ((cmd->data_len >> dev->block_shift) >> 1))) { if (cmd->cdb[1] & 0x80) { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting ref tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->ref_tag = cpu_to_be32(0xebfeedad); scst_check_fail_ref_tag(cmd); } else { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting guard tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->guard_tag = cpu_to_be16(0xebed); scst_check_fail_guard_tag(cmd); } } break; case 5: if (lba == (cmd->lba + ((cmd->data_len >> dev->block_shift) - 3))) { if (cmd->cdb[1] & 0x80) { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting ref tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->ref_tag = cpu_to_be32(0xebfeedad); scst_check_fail_ref_tag(cmd); } else { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting guard tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->guard_tag = cpu_to_be16(0xebed); scst_check_fail_guard_tag(cmd); } } break; case 6: if (lba == (cmd->lba + ((cmd->data_len >> dev->block_shift) - 2))) { if (cmd->cdb[1] & 0x80) { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting ref tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->ref_tag = cpu_to_be32(0xebfeedad); scst_check_fail_ref_tag(cmd); } else { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting guard tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->guard_tag = cpu_to_be16(0xebed); scst_check_fail_guard_tag(cmd); } } break; case 7: if (lba == (cmd->lba + ((cmd->data_len >> dev->block_shift) - 1))) { if (cmd->cdb[1] & 0x80) { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting ref tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->ref_tag = cpu_to_be32(0xebfeedad); scst_check_fail_ref_tag(cmd); } else { TRACE(TRACE_SCSI|TRACE_MINOR, "Corrupting guard tag at lba " "%lld (case %d, cmd %p)", (long long)lba, cmd->cmd_corrupt_dif_tag, cmd); t->guard_tag = cpu_to_be16(0xebed); scst_check_fail_guard_tag(cmd); } } break; } #endif cur_buf += dev->block_size; lba++; t++; tags_len -= tag_size; if (tags_len == 0) { scst_put_dif_buf(cmd, tags_buf); tags_buf = NULL; } } scst_put_buf(cmd, buf); len = scst_get_buf_next(cmd, &buf); } EXTRACHECKS_BUG_ON(tags_buf != NULL); TRACE_EXIT_RES(res); return res; } static int scst_do_dif(struct scst_cmd *cmd, int (*generate_fn)(struct scst_cmd *cmd), int (*verify_fn)(struct scst_cmd *cmd)) { int res; enum scst_dif_actions action = scst_get_dif_action( scst_get_scst_dif_actions(cmd->cmd_dif_actions)); TRACE_ENTRY(); TRACE_DBG("cmd %p, action %d", cmd, action); switch (action) { case SCST_DIF_ACTION_PASS: /* Nothing to do */ TRACE_DBG("PASS DIF action, skipping (cmd %p)", cmd); res = 0; break; case SCST_DIF_ACTION_STRIP: case SCST_DIF_ACTION_PASS_CHECK: { enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions); if (likely(checks != SCST_DIF_ACTION_NONE)) res = verify_fn(cmd); else res = 0; break; } case SCST_DIF_ACTION_INSERT: res = generate_fn(cmd); break; case SCST_DIF_CHECK_APP_TAG: case SCST_DIF_CHECK_GUARD_TAG: case SCST_DIF_CHECK_REF_TAG: default: EXTRACHECKS_BUG_ON(1); /* fall through */ case SCST_DIF_ACTION_NONE: /* Nothing to do */ TRACE_DBG("NONE DIF action, skipping (cmd %p)", cmd); res = 0; break; } TRACE_EXIT_RES(res); return res; } static int scst_dif_type1(struct scst_cmd *cmd) { int res; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(cmd->dev->dev_dif_type != 1); res = scst_do_dif(cmd, scst_generate_dif_type1, scst_verify_dif_type1); TRACE_EXIT_RES(res); return res; } static int scst_verify_dif_type2(struct scst_cmd *cmd) { int res = 0; struct scst_device *dev = cmd->dev; enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions); int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT; struct scatterlist *tags_sg = NULL; uint8_t *buf, *tags_buf = NULL; const struct t10_pi_tuple *t = NULL; /* to silence compiler warning */ uint64_t lba = cmd->lba; int block_size = dev->block_size, block_shift = dev->block_shift; __be16 (*crc_fn)(const void *buffer, unsigned int len); uint32_t ref_tag = scst_cmd_get_dif_exp_ref_tag(cmd); /* Let's keep both in BE */ __be16 app_tag_mask = cpu_to_be16(scst_cmd_get_dif_app_tag_mask(cmd)); __be16 app_tag_masked = cpu_to_be16(scst_cmd_get_dif_exp_app_tag(cmd)) & app_tag_mask; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(dev->dev_dif_type != 2); #ifdef CONFIG_SCST_EXTRACHECKS switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) { case SCST_DIF_ACTION_STRIP: case SCST_DIF_ACTION_PASS_CHECK: break; default: EXTRACHECKS_BUG_ON(1); break; } EXTRACHECKS_BUG_ON(checks == SCST_DIF_ACTION_NONE); #endif crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn; len = scst_get_buf_first(cmd, &buf); while (len > 0) { int i; uint8_t *cur_buf = buf; for (i = 0; i < (len >> block_shift); i++) { if (tags_buf == NULL) { tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len); EXTRACHECKS_BUG_ON(tags_len <= 0); t = (struct t10_pi_tuple *)tags_buf; } if (t->app_tag == SCST_DIF_NO_CHECK_ALL_APP_TAG) { TRACE_DBG("Skipping tag (cmd %p)", cmd); goto next; } if (checks & SCST_DIF_CHECK_APP_TAG) { if ((t->app_tag & app_tag_mask) != app_tag_masked) { PRINT_WARNING("APP TAG check failed, " "expected 0x%x, seeing " "0x%x (cmd %p (op %s), dev %s)", app_tag_masked, t->app_tag & app_tag_mask, cmd, scst_get_opcode_name(cmd), dev->virt_name); scst_dif_acc_app_check_failed_scst(cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_logical_block_app_tag_check_failed)); res = -EIO; goto out_put; } } if (checks & SCST_DIF_CHECK_REF_TAG) { if (t->ref_tag != cpu_to_be32(ref_tag)) { PRINT_WARNING("REF TAG check failed, " "expected 0x%x, seeing " "0x%x (cmd %p (op %s), dev %s)", cpu_to_be32(ref_tag), t->ref_tag, cmd, scst_get_opcode_name(cmd), dev->virt_name); scst_dif_acc_ref_check_failed_scst(cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_logical_block_ref_tag_check_failed)); res = -EIO; goto out_put; } } /* Skip CRC check for internal commands */ if ((checks & SCST_DIF_CHECK_GUARD_TAG) && !cmd->internal) { __be16 crc = crc_fn(cur_buf, block_size); if (t->guard_tag != crc) { PRINT_WARNING("GUARD TAG check failed, " "expected 0x%x, seeing 0x%x " "(cmd %p (op %s), lba %lld, " "dev %s)", crc, t->guard_tag, cmd, scst_get_opcode_name(cmd), (long long)lba, dev->virt_name); scst_dif_acc_guard_check_failed_scst(cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_logical_block_guard_check_failed)); res = -EIO; goto out_put; } } next: cur_buf += dev->block_size; lba++; ref_tag++; t++; tags_len -= tag_size; if (tags_len == 0) { scst_put_dif_buf(cmd, tags_buf); tags_buf = NULL; } } scst_put_buf(cmd, buf); len = scst_get_buf_next(cmd, &buf); } EXTRACHECKS_BUG_ON(tags_buf != NULL); out: TRACE_EXIT_RES(res); return res; out_put: scst_put_buf(cmd, buf); scst_put_dif_buf(cmd, tags_buf); goto out; } static int scst_generate_dif_type2(struct scst_cmd *cmd) { int res = 0; struct scst_device *dev = cmd->dev; int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT; struct scatterlist *tags_sg = NULL; uint8_t *buf, *tags_buf = NULL; struct t10_pi_tuple *t = NULL; /* to silence compiler warning */ int block_size = dev->block_size, block_shift = dev->block_shift; __be16 (*crc_fn)(const void *buffer, unsigned int len); uint32_t ref_tag = scst_cmd_get_dif_exp_ref_tag(cmd); /* Let's keep both in BE */ __be16 app_tag_mask = cpu_to_be16(scst_cmd_get_dif_app_tag_mask(cmd)); __be16 app_tag_masked = cpu_to_be16(scst_cmd_get_dif_exp_app_tag(cmd)) & app_tag_mask; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(dev->dev_dif_type != 2); #ifdef CONFIG_SCST_EXTRACHECKS switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) { case SCST_DIF_ACTION_INSERT: break; default: EXTRACHECKS_BUG_ON(1); break; } #endif crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn; len = scst_get_buf_first(cmd, &buf); while (len > 0) { int i; uint8_t *cur_buf = buf; TRACE_DBG("len %d", len); for (i = 0; i < (len >> block_shift); i++) { TRACE_DBG("tags_len %d", tags_len); if (tags_buf == NULL) { tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len); TRACE_DBG("tags_sg %p, tags_buf %p, tags_len %d", tags_sg, tags_buf, tags_len); EXTRACHECKS_BUG_ON(tags_len <= 0); t = (struct t10_pi_tuple *)tags_buf; } t->app_tag = app_tag_masked; t->ref_tag = cpu_to_be32(ref_tag); t->guard_tag = crc_fn(cur_buf, block_size); cur_buf += dev->block_size; ref_tag++; t++; tags_len -= tag_size; if (tags_len == 0) { scst_put_dif_buf(cmd, tags_buf); tags_buf = NULL; } } scst_put_buf(cmd, buf); len = scst_get_buf_next(cmd, &buf); } EXTRACHECKS_BUG_ON(tags_buf != NULL); TRACE_EXIT_RES(res); return res; } static int scst_dif_type2(struct scst_cmd *cmd) { int res; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(cmd->dev->dev_dif_type != 2); res = scst_do_dif(cmd, scst_generate_dif_type2, scst_verify_dif_type2); TRACE_EXIT_RES(res); return res; } static int scst_verify_dif_type3(struct scst_cmd *cmd) { int res = 0; struct scst_device *dev = cmd->dev; enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions); int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT; struct scatterlist *tags_sg = NULL; uint8_t *buf, *tags_buf = NULL; const struct t10_pi_tuple *t = NULL; /* to silence compiler warning */ uint64_t lba = cmd->lba; int block_size = dev->block_size, block_shift = dev->block_shift; __be16 (*crc_fn)(const void *buffer, unsigned int len); TRACE_ENTRY(); EXTRACHECKS_BUG_ON(dev->dev_dif_type != 3); #ifdef CONFIG_SCST_EXTRACHECKS switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) { case SCST_DIF_ACTION_STRIP: case SCST_DIF_ACTION_PASS_CHECK: break; default: EXTRACHECKS_BUG_ON(1); break; } EXTRACHECKS_BUG_ON(checks == SCST_DIF_ACTION_NONE); #endif crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn; len = scst_get_buf_first(cmd, &buf); while (len > 0) { int i; uint8_t *cur_buf = buf; for (i = 0; i < (len >> block_shift); i++) { if (tags_buf == NULL) { tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len); EXTRACHECKS_BUG_ON(tags_len <= 0); t = (struct t10_pi_tuple *)tags_buf; } if ((t->app_tag == SCST_DIF_NO_CHECK_ALL_APP_TAG) && (t->ref_tag == SCST_DIF_NO_CHECK_ALL_REF_TAG)) { TRACE_DBG("Skipping tag (cmd %p)", cmd); goto next; } if (checks & SCST_DIF_CHECK_APP_TAG) { if (t->app_tag != dev->dev_dif_static_app_tag) { PRINT_WARNING("APP TAG check failed, " "expected 0x%x, seeing " "0x%x (cmd %p (op %s), dev %s)", dev->dev_dif_static_app_tag, t->app_tag, cmd, scst_get_opcode_name(cmd), dev->virt_name); scst_dif_acc_app_check_failed_scst(cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_logical_block_app_tag_check_failed)); res = -EIO; goto out_put; } } if (checks & SCST_DIF_CHECK_REF_TAG) { if (t->ref_tag != dev->dev_dif_static_app_ref_tag) { PRINT_WARNING("REF TAG check failed, " "expected 0x%x, seeing " "0x%x (cmd %p (op %s), dev %s)", dev->dev_dif_static_app_ref_tag, t->ref_tag, cmd, scst_get_opcode_name(cmd), dev->virt_name); scst_dif_acc_ref_check_failed_scst(cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_logical_block_ref_tag_check_failed)); res = -EIO; goto out_put; } } /* Skip CRC check for internal commands */ if ((checks & SCST_DIF_CHECK_GUARD_TAG) && !cmd->internal) { __be16 crc = crc_fn(cur_buf, block_size); if (t->guard_tag != crc) { PRINT_WARNING("GUARD TAG check failed, " "expected 0x%x, seeing 0x%x " "(cmd %p (op %s), lba %lld, " "dev %s)", crc, t->guard_tag, cmd, scst_get_opcode_name(cmd), (long long)lba, dev->virt_name); scst_dif_acc_guard_check_failed_scst(cmd); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_logical_block_guard_check_failed)); res = -EIO; goto out_put; } } next: cur_buf += dev->block_size; lba++; t++; tags_len -= tag_size; if (tags_len == 0) { scst_put_dif_buf(cmd, tags_buf); tags_buf = NULL; } } scst_put_buf(cmd, buf); len = scst_get_buf_next(cmd, &buf); } EXTRACHECKS_BUG_ON(tags_buf != NULL); out: TRACE_EXIT_RES(res); return res; out_put: scst_put_buf(cmd, buf); scst_put_dif_buf(cmd, tags_buf); goto out; } static int scst_generate_dif_type3(struct scst_cmd *cmd) { int res = 0; struct scst_device *dev = cmd->dev; int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT; struct scatterlist *tags_sg = NULL; uint8_t *buf, *tags_buf = NULL; struct t10_pi_tuple *t = NULL; /* to silence compiler warning */ int block_size = dev->block_size, block_shift = dev->block_shift; __be16 (*crc_fn)(const void *buffer, unsigned int len); TRACE_ENTRY(); EXTRACHECKS_BUG_ON(dev->dev_dif_type != 3); #ifdef CONFIG_SCST_EXTRACHECKS switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) { case SCST_DIF_ACTION_INSERT: break; default: EXTRACHECKS_BUG_ON(1); break; } #endif crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn; len = scst_get_buf_first(cmd, &buf); while (len > 0) { int i; uint8_t *cur_buf = buf; TRACE_DBG("len %d", len); for (i = 0; i < (len >> block_shift); i++) { TRACE_DBG("tags_len %d", tags_len); if (tags_buf == NULL) { tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len); TRACE_DBG("tags_sg %p, tags_buf %p, tags_len %d", tags_sg, tags_buf, tags_len); EXTRACHECKS_BUG_ON(tags_len <= 0); t = (struct t10_pi_tuple *)tags_buf; } t->app_tag = dev->dev_dif_static_app_tag; t->ref_tag = dev->dev_dif_static_app_ref_tag; t->guard_tag = crc_fn(cur_buf, block_size); cur_buf += dev->block_size; t++; tags_len -= tag_size; if (tags_len == 0) { scst_put_dif_buf(cmd, tags_buf); tags_buf = NULL; } } scst_put_buf(cmd, buf); len = scst_get_buf_next(cmd, &buf); } EXTRACHECKS_BUG_ON(tags_buf != NULL); TRACE_EXIT_RES(res); return res; } static int scst_dif_type3(struct scst_cmd *cmd) { int res; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(cmd->dev->dev_dif_type != 3); res = scst_do_dif(cmd, scst_generate_dif_type3, scst_verify_dif_type3); TRACE_EXIT_RES(res); return res; } static void scst_init_dif_checks(struct scst_device *dev) { switch (dev->dev_dif_type) { case 0: dev->dif_app_chk = 0; dev->dif_ref_chk = 0; break; case 1: if (scst_dev_get_dif_static_app_tag(dev) != SCST_DIF_NO_CHECK_APP_TAG) dev->dif_app_chk = SCST_DIF_CHECK_APP_TAG; else dev->dif_app_chk = 0; dev->dif_ref_chk = SCST_DIF_CHECK_REF_TAG; break; case 2: dev->dif_app_chk = dev->ato ? SCST_DIF_CHECK_APP_TAG : 0; dev->dif_ref_chk = SCST_DIF_CHECK_REF_TAG; break; case 3: if (scst_dev_get_dif_static_app_tag_combined(dev) != SCST_DIF_NO_CHECK_APP_TAG) { dev->dif_app_chk = SCST_DIF_CHECK_APP_TAG; dev->dif_ref_chk = SCST_DIF_CHECK_REF_TAG; } else { dev->dif_app_chk = 0; dev->dif_ref_chk = 0; } break; default: WARN_ON(1); break; } return; } /** * scst_dev_set_dif_static_app_tag_combined() - sets static app tag * * Description: * Sets static app tag for both APP TAG and REF TAG (DIF mode 3) */ void scst_dev_set_dif_static_app_tag_combined( struct scst_device *dev, __be64 app_tag) { uint64_t a = be64_to_cpu(app_tag); dev->dev_dif_static_app_tag = cpu_to_be16(a & 0xFFFF); if (dev->dev_dif_type == 3) dev->dev_dif_static_app_ref_tag = cpu_to_be32((a >> 16) & 0xFFFFFFFF); scst_init_dif_checks(dev); return; } EXPORT_SYMBOL_GPL(scst_dev_set_dif_static_app_tag_combined); static int scst_init_dif_actions(struct scst_device *dev) { int res = 0; TRACE_ENTRY(); BUILD_BUG_ON(SCST_DIF_ACTION_NONE != 0); if ((dev->dev_dif_type == 0) || (dev->dev_dif_mode == 0)) { dev->dev_dif_rd_actions = SCST_DIF_ACTION_NONE; dev->dev_dif_wr_actions = SCST_DIF_ACTION_NONE; dev->dev_dif_rd_prot0_actions = SCST_DIF_ACTION_NONE; dev->dev_dif_wr_prot0_actions = SCST_DIF_ACTION_NONE; goto out; } if ((dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) && !(dev->dev_dif_mode & SCST_DIF_MODE_DEV_STORE)) { PRINT_ERROR("DEV CHECK is not allowed without DEV STORE! " "(dev %s)", dev->virt_name); res = -EINVAL; goto out; } /* * COMMON RULES * ============ * * 1. For SCST STRIP and PASS_CHECK as well as PASS and NONE are * the same. * * 2. For dev handlers STRIP and INSERT are invalid, PASS and NONE are * the same. Also, PASS and PASS_CHECK are equal regarding STORE, * if STORE is configured. */ BUILD_BUG_ON(SCST_DIF_MODE_DEV != (SCST_DIF_MODE_DEV_CHECK | SCST_DIF_MODE_DEV_STORE)); if (dev->dev_dif_mode & SCST_DIF_MODE_TGT) { if (dev->dev_dif_mode & SCST_DIF_MODE_SCST) { if (dev->dev_dif_mode & SCST_DIF_MODE_DEV) { /* TGT, SCST, DEV */ scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK); scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS); if (dev->dpicz) { scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); } else { scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_STRIP); scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS_CHECK); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS); } scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK); scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS); scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_INSERT); scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS_CHECK); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS); } else { /* TGT, SCST, no DEV */ scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK); scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_INSERT); scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_NONE); if (dev->dpicz) { scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); } else { scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_STRIP); scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_INSERT); } scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK); scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_STRIP); scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_NONE); scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_INSERT); scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_STRIP); scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE); } } else { /* TGT, no SCST */ if (dev->dev_dif_mode & SCST_DIF_MODE_DEV) { /* TGT, no SCST, DEV */ scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK); scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK); } else { scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS); } if (dev->dpicz) { scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); } else { scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_STRIP); scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS); } scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK); scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS); scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_INSERT); scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS); } else { /* TGT, no SCST, no DEV */ scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_INSERT); scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_NONE); scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_NONE); scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); #if 1 /* * Workaround for Emulex ASIC errata to pass Oracle certification. * * Emulex ASIC in the STRIP mode can't distinguish between different types of * PI tags mismatches (reference, guard, application), hence the Oracle * certification fails. Workaround is to get the tags data in the memory, so * then, if HW is signaling that there is some tag mismatch, manually recheck * in the driver, then set correct tag mismatch sense. */ scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK); scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS); #else scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_STRIP); scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_NONE); #endif scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_NONE); scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE); } } } else { /* No TGT */ if (dev->dev_dif_mode & SCST_DIF_MODE_SCST) { /* No TGT, SCST */ if (dev->dev_dif_mode & SCST_DIF_MODE_DEV) { /* No TGT, SCST, DEV */ scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS); scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS); scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); if (dev->dpicz) { scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); } else { scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_STRIP); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS); } scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS); scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS); scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_INSERT); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS); } else { /* No TGT, SCST, no DEV */ scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS); scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_INSERT); scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_NONE); scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS); scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_STRIP); scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_NONE); scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE); } } else { /* No TGT, no SCST */ if (dev->dev_dif_mode & SCST_DIF_MODE_DEV) { /* No TGT, no SCST, DEV */ scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS); scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS); scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); if (dev->dpicz) { scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE); } else { scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS); } scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS); scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS); scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE); scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_INSERT); if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) { /* STORE might be set as well */ scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS_CHECK); } else scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS); } else { /* No TGT, no SCST, no DEV */ sBUG_ON(1); } } } TRACE_DBG("rd_actions %x, rd_prot0_actions %x, wr_actions %x, " "wr_prot0_actions %x", dev->dev_dif_rd_actions, dev->dev_dif_rd_prot0_actions, dev->dev_dif_wr_actions, dev->dev_dif_wr_prot0_actions); out: TRACE_EXIT_RES(res); return res; } /** * scst_set_dif_params() - sets DIF parameters * * Description: * Sets DIF parameters for device * * Returns: 0 on success, negative error code otherwise. */ int scst_set_dif_params(struct scst_device *dev, enum scst_dif_mode dif_mode, int dif_type) { int res = -EINVAL; TRACE_ENTRY(); BUILD_BUG_ON(SCST_DIF_ACTION_NONE != 0); if (((dif_mode & ~(SCST_DIF_MODE_TGT|SCST_DIF_MODE_SCST|SCST_DIF_MODE_DEV)) != 0)) { PRINT_ERROR("Invalid DIF mode %x", dif_mode); goto out; } if ((dif_type < 0) || (dif_type > 3)) { PRINT_ERROR("DIF type %d not supported", dif_type); goto out; } if ((dif_mode == 0) && (dif_type != 0)) { PRINT_ERROR("With DIF mode 0 DIF type must be 0 (dev %s)", dev->virt_name); goto out; } dev->dev_dif_mode = dif_mode; dev->dev_dif_type = dif_type; if (dif_type == 0) { TRACE_DBG("DIF type 0, ignoring DIF mode"); goto out_none; } if (dif_mode == 0) { TRACE_DBG("DIF mode 0"); goto out_none; } scst_init_dif_checks(dev); if (dif_mode & SCST_DIF_MODE_SCST) { switch (dif_type) { case 1: dev->dev_dif_fn = scst_dif_type1; break; case 2: dev->dev_dif_fn = scst_dif_type2; break; case 3: dev->dev_dif_fn = scst_dif_type3; break; default: sBUG_ON(1); break; } } else { if ((dif_type == 1) && !(dif_mode & SCST_DIF_MODE_TGT)) dev->dev_dif_fn = scst_dif_type1; else if ((dif_type == 1) && (dif_mode & SCST_DIF_MODE_TGT)) dev->dev_dif_fn = scst_dif_none_type1; else dev->dev_dif_fn = scst_dif_none; } res = scst_init_dif_actions(dev); if (res != 0) goto out; res = scst_dev_sysfs_dif_create(dev); if (res != 0) goto out; PRINT_INFO("device %s: DIF mode %x, DIF type %d", dev->virt_name, dev->dev_dif_mode, dev->dev_dif_type); TRACE_DBG("app_chk %x, ref_chk %x", dev->dif_app_chk, dev->dif_ref_chk); out: TRACE_EXIT_RES(res); return res; out_none: dev->dif_app_chk = 0; if (dev->dev_dif_type == 3) dev->dif_ref_chk = 0; dev->dev_dif_static_app_tag = SCST_DIF_NO_CHECK_APP_TAG; dev->dev_dif_static_app_ref_tag = SCST_DIF_NO_CHECK_APP_TAG; dev->dev_dif_fn = scst_dif_none; res = scst_init_dif_actions(dev); goto out; } EXPORT_SYMBOL_GPL(scst_set_dif_params); static int scst_dif_none(struct scst_cmd *cmd) { int res = 0; TRACE_ENTRY(); /* Nothing to do */ TRACE_EXIT_RES(res); return res; } #ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS static int scst_dif_none_type1(struct scst_cmd *cmd) { int res = 0; TRACE_ENTRY(); if (unlikely(cmd->cmd_corrupt_dif_tag != 0)) { EXTRACHECKS_BUG_ON(cmd->dev->dev_dif_type != 1); res = scst_dif_type1(cmd); } TRACE_EXIT_RES(res); return res; } #endif /* * Returns 0 on success or POSITIVE error code otherwise (to match * scst_get_cdb_info() semantic) */ static int __scst_parse_rdprotect(struct scst_cmd *cmd, int rdprotect, int rdprotect_offs) { int res = 0; const struct scst_device *dev = cmd->dev; TRACE_ENTRY(); TRACE_DBG("rdprotect %x", rdprotect); EXTRACHECKS_BUG_ON(dev->dev_dif_type == 0); switch (rdprotect) { case 0: cmd->cmd_dif_actions = dev->dev_dif_rd_prot0_actions | SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk | dev->dif_ref_chk; break; case 1: case 5: cmd->cmd_dif_actions = dev->dev_dif_rd_actions | SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk | dev->dif_ref_chk; cmd->tgt_dif_data_expected = 1; break; case 2: cmd->cmd_dif_actions = dev->dev_dif_rd_actions | dev->dif_app_chk | dev->dif_ref_chk; cmd->tgt_dif_data_expected = 1; break; case 3: cmd->cmd_dif_actions = dev->dev_dif_rd_actions; cmd->tgt_dif_data_expected = 1; break; case 4: cmd->cmd_dif_actions = dev->dev_dif_rd_actions | dev->dif_app_chk; cmd->tgt_dif_data_expected = 1; break; default: TRACE(TRACE_SCSI|TRACE_MINOR, "Invalid RDPROTECT value %x " "(dev %s, cmd %p)", rdprotect, dev->virt_name, cmd); scst_set_invalid_field_in_cdb(cmd, rdprotect_offs, 5|SCST_INVAL_FIELD_BIT_OFFS_VALID); res = EINVAL; goto out; } TRACE_DBG("cmd_dif_actions %x, tgt_dif_data_expected %d (cmd %p)", cmd->cmd_dif_actions, cmd->tgt_dif_data_expected, cmd); out: TRACE_EXIT_RES(res); return res; } /* * Returns 0 on success or POSITIVE error code otherwise (to match * scst_get_cdb_info() semantic) */ static int scst_parse_rdprotect(struct scst_cmd *cmd) { int res = 0; int rdprotect = (cmd->cdb[1] & 0xE0) >> 5; const struct scst_device *dev = cmd->dev; TRACE_ENTRY(); if (dev->dev_dif_mode == SCST_DIF_MODE_NONE) { if (likely(rdprotect == 0)) goto out; TRACE(TRACE_SCSI|TRACE_MINOR, "RDPROTECT %x and no DIF " "device %s (cmd %p)", rdprotect, dev->virt_name, cmd); scst_set_invalid_field_in_cdb(cmd, 1, 5|SCST_INVAL_FIELD_BIT_OFFS_VALID); res = EINVAL; goto out; } if (unlikely((dev->dev_dif_type == 2) && (rdprotect != 0))) { TRACE(TRACE_SCSI|TRACE_MINOR, "Non-32-byte CDBs with non-zero " "rdprotect (%d) are not allowed in DIF type 2 " "(dev %s, cmd %p, op %s)", rdprotect, dev->virt_name, cmd, scst_get_opcode_name(cmd)); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_invalid_opcode)); res = EINVAL; goto out; } #ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS if (unlikely(cmd->cmd_corrupt_dif_tag != 0)) { if ((cmd->dev->dev_dif_type == 1) && ((dev->dev_dif_mode & SCST_DIF_MODE_DEV_STORE) == 0)) { TRACE_DBG("cmd_corrupt_dif_tag %x, rdprotect %x, cmd %p", cmd->cmd_corrupt_dif_tag, rdprotect, cmd); /* Reset the highest bit used to choose which tag to corrupt */ rdprotect &= 3; } else { /* Restore it */ cmd->cmd_corrupt_dif_tag = 0; } } #endif res = __scst_parse_rdprotect(cmd, rdprotect, 1); #ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS if (unlikely(cmd->cmd_corrupt_dif_tag != 0)) { if (res == 0) { TRACE_DBG("Corrupt DIF tag, (re)set cmd_dif_actions " "(cmd %p)", cmd); /* * Then (re)set it just in case if dif_mode is tgt-only. * It's OK, because we have ensured that dif_mode * doesn't contain dev_store. */ scst_set_scst_dif_action(&cmd->cmd_dif_actions, SCST_DIF_ACTION_INSERT); if (scst_get_dif_action(scst_get_read_dif_tgt_actions(cmd)) == SCST_DIF_ACTION_INSERT) scst_set_tgt_dif_action(&cmd->cmd_dif_actions, SCST_DIF_ACTION_PASS_CHECK); } else TRACE_DBG("parse rdprotect failed: %d", res); } #endif out: TRACE_EXIT_RES(res); return res; } /* * Returns 0 on success or POSITIVE error code otherwise (to match * scst_get_cdb_info() semantic) */ static int scst_parse_rdprotect32(struct scst_cmd *cmd) { int res = 0; int rdprotect = (cmd->cdb[10] & 0xE0) >> 5; const struct scst_device *dev = cmd->dev; TRACE_ENTRY(); if (unlikely(dev->dev_dif_type != 2)) { TRACE(TRACE_SCSI|TRACE_MINOR, "32-byte CDBs are not " "allowed in DIF type %d (dev %s, cmd %p, op %s)", dev->dev_dif_type, dev->virt_name, cmd, scst_get_opcode_name(cmd)); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_invalid_opcode)); res = EINVAL; goto out; } res = __scst_parse_rdprotect(cmd, rdprotect, 10); out: TRACE_EXIT_RES(res); return res; } /* * Returns 0 on success or POSITIVE error code otherwise (to match * scst_get_cdb_info() semantic) */ static int __scst_parse_wrprotect(struct scst_cmd *cmd, int wrprotect, int wrprotect_offs) { int res = 0; struct scst_device *dev = cmd->dev; TRACE_ENTRY(); TRACE_DBG("wrprotect %x", wrprotect); EXTRACHECKS_BUG_ON(dev->dev_dif_type == 0); switch (wrprotect) { case 0: cmd->cmd_dif_actions = dev->dev_dif_wr_prot0_actions | SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk | dev->dif_ref_chk; break; case 1: cmd->cmd_dif_actions = dev->dev_dif_wr_actions | SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk | dev->dif_ref_chk; cmd->tgt_dif_data_expected = 1; break; case 2: cmd->cmd_dif_actions = dev->dev_dif_wr_actions | dev->dif_app_chk | dev->dif_ref_chk; cmd->tgt_dif_data_expected = 1; break; case 3: cmd->cmd_dif_actions = dev->dev_dif_wr_actions; cmd->tgt_dif_data_expected = 1; break; case 4: cmd->cmd_dif_actions = dev->dev_dif_wr_actions | SCST_DIF_CHECK_GUARD_TAG; cmd->tgt_dif_data_expected = 1; break; case 5: cmd->cmd_dif_actions = dev->dev_dif_wr_actions | SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk | dev->dif_ref_chk; cmd->tgt_dif_data_expected = 1; break; default: TRACE(TRACE_SCSI|TRACE_MINOR, "Invalid WRPROTECT value %x " "(dev %s, cmd %p)", wrprotect, dev->virt_name, cmd); scst_set_invalid_field_in_cdb(cmd, wrprotect_offs, 5|SCST_INVAL_FIELD_BIT_OFFS_VALID); res = EINVAL; goto out; } TRACE_DBG("cmd_dif_actions %x, tgt_dif_data_expected %d (cmd %p)", cmd->cmd_dif_actions, cmd->tgt_dif_data_expected, cmd); out: TRACE_EXIT_RES(res); return res; } /* * Returns 0 on success or POSITIVE error code otherwise (to match * scst_get_cdb_info() semantic) */ static int scst_parse_wrprotect(struct scst_cmd *cmd) { int res = 0; int wrprotect = (cmd->cdb[1] & 0xE0) >> 5; const struct scst_device *dev = cmd->dev; TRACE_ENTRY(); if (dev->dev_dif_mode == SCST_DIF_MODE_NONE) { if (likely(wrprotect == 0)) goto out; TRACE(TRACE_SCSI|TRACE_MINOR, "WRPROTECT %x and no DIF " "device %s (cmd %p)", wrprotect, dev->virt_name, cmd); scst_set_invalid_field_in_cdb(cmd, 1, 5|SCST_INVAL_FIELD_BIT_OFFS_VALID); res = EINVAL; goto out; } if (unlikely((dev->dev_dif_type == 2) && (wrprotect != 0))) { TRACE(TRACE_SCSI|TRACE_MINOR, "Non-32-byte CDBs with non-zero " "wrprotect (%d) are not allowed in DIF type 2 " "(dev %s, cmd %p, op %s)", wrprotect, dev->virt_name, cmd, scst_get_opcode_name(cmd)); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_invalid_opcode)); res = EINVAL; goto out; } res = __scst_parse_wrprotect(cmd, wrprotect, 1); out: TRACE_EXIT_RES(res); return res; } /* * Returns 0 on success or POSITIVE error code otherwise (to match * scst_get_cdb_info() semantic) */ static int scst_parse_wrprotect32(struct scst_cmd *cmd) { int res = 0; int wrprotect = (cmd->cdb[10] & 0xE0) >> 5; const struct scst_device *dev = cmd->dev; TRACE_ENTRY(); if (unlikely(dev->dev_dif_type != 2)) { TRACE(TRACE_SCSI|TRACE_MINOR, "32-byte CDBs are not " "allowed in DIF type %d (dev %s, cmd %p, op %s)", dev->dev_dif_type, dev->virt_name, cmd, scst_get_opcode_name(cmd)); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_invalid_opcode)); res = EINVAL; goto out; } res = __scst_parse_wrprotect(cmd, wrprotect, 10); out: TRACE_EXIT_RES(res); return res; } /* * Returns 0 on success or POSITIVE error code otherwise (to match * scst_get_cdb_info() semantic) */ static int __scst_parse_vrprotect(struct scst_cmd *cmd, int vrprotect_offs) { int res = 0; struct scst_device *dev = cmd->dev; int vrprotect = (cmd->cdb[vrprotect_offs] & 0xE0) >> 5; int bytchk = (cmd->cdb[vrprotect_offs] & 6) >> 1; TRACE_ENTRY(); TRACE_DBG("vrprotect %x", vrprotect); EXTRACHECKS_BUG_ON(dev->dev_dif_type == 0); switch (bytchk) { case 0: switch (vrprotect) { case 0: if (dev->dpicz) { cmd->cmd_dif_actions = 0; break; } /* fall through */ case 1: case 5: cmd->cmd_dif_actions = SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk | dev->dif_ref_chk; break; case 2: cmd->cmd_dif_actions = dev->dif_app_chk | dev->dif_ref_chk; break; case 3: cmd->cmd_dif_actions = 0; break; case 4: cmd->cmd_dif_actions = SCST_DIF_CHECK_GUARD_TAG; break; default: TRACE(TRACE_SCSI|TRACE_MINOR, "Invalid VRPROTECT value %x " "(dev %s, cmd %p)", vrprotect, dev->virt_name, cmd); scst_set_invalid_field_in_cdb(cmd, vrprotect_offs, 5|SCST_INVAL_FIELD_BIT_OFFS_VALID); res = EINVAL; goto out; } break; case 1: case 3: switch (vrprotect) { case 0: if (dev->dpicz) cmd->cmd_dif_actions = 0; else cmd->cmd_dif_actions = dev->dev_dif_wr_actions | SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk | dev->dif_ref_chk; break; case 1: case 2: case 3: case 4: case 5: cmd->cmd_dif_actions = 0; break; default: TRACE(TRACE_SCSI|TRACE_MINOR, "Invalid VRPROTECT value %x " "(dev %s, cmd %p)", vrprotect, dev->virt_name, cmd); scst_set_invalid_field_in_cdb(cmd, vrprotect_offs, 5|SCST_INVAL_FIELD_BIT_OFFS_VALID); res = EINVAL; goto out; } break; default: sBUG_ON(1); break; } TRACE_DBG("cmd_dif_actions %x, tgt_dif_data_expected %d (cmd %p, " "bytchk %d)", cmd->cmd_dif_actions, cmd->tgt_dif_data_expected, cmd, bytchk); out: TRACE_EXIT_RES(res); return res; } /* * Returns 0 on success or POSITIVE error code otherwise (to match * scst_get_cdb_info() semantic) */ static int scst_parse_vrprotect(struct scst_cmd *cmd) { int res = 0; int vrprotect = (cmd->cdb[1] & 0xE0) >> 5; const struct scst_device *dev = cmd->dev; TRACE_ENTRY(); if (dev->dev_dif_mode == SCST_DIF_MODE_NONE) { if (likely(vrprotect == 0)) goto out; TRACE(TRACE_SCSI|TRACE_MINOR, "VRPROTECT %x and no DIF " "device %s (cmd %p)", vrprotect, dev->virt_name, cmd); scst_set_invalid_field_in_cdb(cmd, 1, 5|SCST_INVAL_FIELD_BIT_OFFS_VALID); res = EINVAL; goto out; } if (unlikely((dev->dev_dif_type == 2) && (vrprotect != 0))) { TRACE(TRACE_SCSI|TRACE_MINOR, "Non-32-byte CDBs with non-zero " "vrprotect (%d) are not allowed in DIF type 2 " "(dev %s, cmd %p, op %s)", vrprotect, dev->virt_name, cmd, scst_get_opcode_name(cmd)); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_invalid_opcode)); res = EINVAL; goto out; } res = __scst_parse_vrprotect(cmd, 1); out: TRACE_EXIT_RES(res); return res; } /* * Returns 0 on success or POSITIVE error code otherwise (to match * scst_get_cdb_info() semantic) */ static int scst_parse_vrprotect32(struct scst_cmd *cmd) { int res = 0; const struct scst_device *dev = cmd->dev; TRACE_ENTRY(); if (unlikely(dev->dev_dif_type != 2)) { TRACE(TRACE_SCSI|TRACE_MINOR, "32-byte CDBs are not " "allowed in DIF type %d (dev %s, cmd %p, op %s)", dev->dev_dif_type, dev->virt_name, cmd, scst_get_opcode_name(cmd)); scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_invalid_opcode)); res = EINVAL; goto out; } res = __scst_parse_vrprotect(cmd, 10); out: TRACE_EXIT_RES(res); return res; } /* * So far we support the only variable length CDBs, 32 bytes SBC PI type 2 * commands, so 32 on the forth place is OK. Don't forget to change it * adding in this group new commands with other lengths! */ static const int scst_cdb_length[8] = { 6, 10, 10, 32, 16, 12, 0, 0 }; #define SCST_CDB_GROUP(opcode) ((opcode >> 5) & 0x7) #define SCST_GET_CDB_LEN(opcode) scst_cdb_length[SCST_CDB_GROUP(opcode)] static int get_cdb_info_len_10(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->cdb_len = 10; cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; /* It supposed to be already zeroed */ EXTRACHECKS_BUG_ON(cmd->bufflen != 0); cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_block_limit(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; cmd->bufflen = 6; cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_read_capacity(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; cmd->bufflen = 8; cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_serv_act_in(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = 0; TRACE_ENTRY(); cmd->lba = 0; switch (cmd->cdb[1] & 0x1f) { case SAI_READ_CAPACITY_16: cmd->op_name = "READ CAPACITY(16)"; cmd->bufflen = get_unaligned_be32(&cmd->cdb[10]); cmd->op_flags |= SCST_IMPLICIT_HQ | SCST_LBA_NOT_VALID | SCST_REG_RESERVE_ALLOWED | SCST_WRITE_EXCL_ALLOWED | SCST_EXCL_ACCESS_ALLOWED; break; case SAI_GET_LBA_STATUS: cmd->op_name = "GET LBA STATUS"; cmd->lba = get_unaligned_be64(&cmd->cdb[2]); cmd->bufflen = get_unaligned_be32(&cmd->cdb[10]); cmd->op_flags |= SCST_WRITE_EXCL_ALLOWED; break; default: cmd->op_flags |= SCST_UNKNOWN_LENGTH | SCST_LBA_NOT_VALID; break; } cmd->data_len = cmd->bufflen; TRACE_EXIT_RES(res); return res; } static int get_cdb_info_single(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; cmd->bufflen = 1; cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_read_pos(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = 0; cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; cmd->bufflen = get_unaligned_be16(cmd->cdb + sdbops->info_len_off); switch (cmd->cdb[1] & 0x1f) { case 0: case 1: cmd->bufflen = 20; break; case 6: cmd->bufflen = 32; break; case 8: cmd->bufflen = max(32, cmd->bufflen); break; default: PRINT_ERROR("READ POSITION: Invalid service action %x", cmd->cdb[1] & 0x1f); goto out_inval_field1; } cmd->data_len = cmd->bufflen; out: return res; out_inval_field1: scst_set_invalid_field_in_cdb(cmd, 1, 0); res = 1; goto out; } static int get_cdb_info_prevent_allow_medium_removal(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; cmd->data_len = 0; /* It supposed to be already zeroed */ EXTRACHECKS_BUG_ON(cmd->bufflen != 0); if ((cmd->cdb[4] & 3) == 0) cmd->op_flags |= SCST_REG_RESERVE_ALLOWED | SCST_WRITE_EXCL_ALLOWED | SCST_EXCL_ACCESS_ALLOWED; return 0; } static int get_cdb_info_start_stop(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; cmd->data_len = 0; /* It supposed to be already zeroed */ EXTRACHECKS_BUG_ON(cmd->bufflen != 0); if ((cmd->cdb[4] & 0xF1) == 0x1) cmd->op_flags |= SCST_REG_RESERVE_ALLOWED | SCST_WRITE_EXCL_ALLOWED | SCST_EXCL_ACCESS_ALLOWED; return 0; } static int get_cdb_info_len_3_read_elem_stat(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; cmd->bufflen = get_unaligned_be24(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; if ((cmd->cdb[6] & 0x2) == 0x2) cmd->op_flags |= SCST_REG_RESERVE_ALLOWED | SCST_WRITE_EXCL_ALLOWED | SCST_EXCL_ACCESS_ALLOWED; return 0; } static int get_cdb_info_bidi_lba_4_len_2(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off); cmd->bufflen = get_unaligned_be16(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; cmd->out_bufflen = cmd->bufflen; return 0; } static int get_cdb_info_fmt(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; if (cmd->cdb[1] & 0x10/*FMTDATA*/) { cmd->data_direction = SCST_DATA_WRITE; cmd->op_flags |= SCST_UNKNOWN_LENGTH; cmd->bufflen = 4096; /* guess */ } else cmd->bufflen = 0; cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_verify10(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { if (unlikely(cmd->cdb[1] & 4)) { PRINT_ERROR("VERIFY(10): BYTCHK 1x not supported (dev %s)", cmd->dev ? cmd->dev->virt_name : NULL); scst_set_invalid_field_in_cdb(cmd, 1, 2 | SCST_INVAL_FIELD_BIT_OFFS_VALID); return 1; } cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off); if (cmd->cdb[1] & 2) { cmd->bufflen = get_unaligned_be16(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; cmd->data_direction = SCST_DATA_WRITE; } else { cmd->bufflen = 0; cmd->data_len = get_unaligned_be16(cmd->cdb + sdbops->info_len_off); cmd->data_direction = SCST_DATA_NONE; } return scst_parse_vrprotect(cmd); } static int get_cdb_info_verify6(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; if (unlikely(cmd->cdb[1] & 4)) { PRINT_ERROR("VERIFY(6): BYTCHK 1x not supported (dev %s)", cmd->dev ? cmd->dev->virt_name : NULL); scst_set_invalid_field_in_cdb(cmd, 1, 2 | SCST_INVAL_FIELD_BIT_OFFS_VALID); return 1; } if (cmd->cdb[1] & 2) { /* BYTCHK 01 */ cmd->bufflen = get_unaligned_be24(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; cmd->data_direction = SCST_DATA_WRITE; } else { cmd->bufflen = 0; cmd->data_len = get_unaligned_be24(cmd->cdb + sdbops->info_len_off); cmd->data_direction = SCST_DATA_NONE; } return 0; } static int get_cdb_info_verify12(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { if (unlikely(cmd->cdb[1] & 4)) { PRINT_ERROR("VERIFY(12): BYTCHK 1x not supported (dev %s)", cmd->dev ? cmd->dev->virt_name : NULL); scst_set_invalid_field_in_cdb(cmd, 1, 2 | SCST_INVAL_FIELD_BIT_OFFS_VALID); return 1; } cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off); if (cmd->cdb[1] & 2) { /* BYTCHK 01 */ cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; cmd->data_direction = SCST_DATA_WRITE; } else { cmd->bufflen = 0; cmd->data_len = get_unaligned_be32(cmd->cdb + sdbops->info_len_off); cmd->data_direction = SCST_DATA_NONE; } return scst_parse_vrprotect(cmd); } static int get_cdb_info_verify16(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { if (unlikely(cmd->cdb[1] & 4)) { PRINT_ERROR("VERIFY(16): BYTCHK 1x not supported (dev %s)", cmd->dev ? cmd->dev->virt_name : NULL); scst_set_invalid_field_in_cdb(cmd, 1, 2 | SCST_INVAL_FIELD_BIT_OFFS_VALID); return 1; } cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off); if (cmd->cdb[1] & 2) { /* BYTCHK 01 */ cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; cmd->data_direction = SCST_DATA_WRITE; } else { cmd->bufflen = 0; cmd->data_len = get_unaligned_be32(cmd->cdb + sdbops->info_len_off); cmd->data_direction = SCST_DATA_NONE; } return scst_parse_vrprotect(cmd); } static int get_cdb_info_verify32(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { if (unlikely(cmd->cdb[10] & 4)) { PRINT_ERROR("VERIFY(16): BYTCHK 1x not supported (dev %s)", cmd->dev ? cmd->dev->virt_name : NULL); scst_set_invalid_field_in_cdb(cmd, 1, 2 | SCST_INVAL_FIELD_BIT_OFFS_VALID); return 1; } cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off); if (cmd->cdb[10] & 2) { cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; cmd->data_direction = SCST_DATA_WRITE; } else { cmd->bufflen = 0; cmd->data_len = get_unaligned_be32(cmd->cdb + sdbops->info_len_off); cmd->data_direction = SCST_DATA_NONE; } return scst_parse_vrprotect32(cmd); } static int get_cdb_info_len_1(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; cmd->bufflen = cmd->cdb[sdbops->info_len_off]; cmd->data_len = cmd->bufflen; return 0; } static inline int get_cdb_info_lba_3_len_1_256(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = (cmd->cdb[sdbops->info_lba_off] & 0x1F) << 16; cmd->lba |= get_unaligned_be16(cmd->cdb + sdbops->info_lba_off + 1); /* * From the READ(6) specification: a TRANSFER LENGTH field set to zero * specifies that 256 logical blocks shall be read. * * Note: while the C standard specifies that the behavior of a * computation with signed integers that overflows is undefined, the * same standard guarantees that the result of a computation with * unsigned integers that cannot be represented will yield the value * is reduced modulo the largest value that can be represented by the * resulting type. */ cmd->bufflen = (u8)(cmd->cdb[sdbops->info_len_off] - 1) + 1; cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_lba_3_len_1_256_read(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = get_cdb_info_lba_3_len_1_256(cmd, sdbops); if (res != 0) goto out; else { struct scst_device *dev = cmd->dev; if ((dev->dev_dif_mode != SCST_DIF_MODE_NONE) && !dev->dpicz) cmd->cmd_dif_actions = dev->dev_dif_rd_prot0_actions | SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk | SCST_DIF_CHECK_REF_TAG; } out: return res; } static int get_cdb_info_lba_3_len_1_256_write(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = get_cdb_info_lba_3_len_1_256(cmd, sdbops); if (res != 0) goto out; else { struct scst_device *dev = cmd->dev; if (dev->dev_dif_mode != SCST_DIF_MODE_NONE) cmd->cmd_dif_actions = dev->dev_dif_wr_prot0_actions | SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk | SCST_DIF_CHECK_REF_TAG; } out: return res; } static int get_cdb_info_len_2(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; cmd->bufflen = get_unaligned_be16(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_len_3(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; cmd->bufflen = get_unaligned_be24(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_len_4(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_none(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->op_flags |= SCST_LBA_NOT_VALID; cmd->lba = 0; /* It supposed to be already zeroed */ EXTRACHECKS_BUG_ON(cmd->bufflen != 0); cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_lba_2_none(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = get_unaligned_be16(cmd->cdb + sdbops->info_lba_off); /* It supposed to be already zeroed */ EXTRACHECKS_BUG_ON(cmd->bufflen != 0); cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_lba_4_none(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off); /* It supposed to be already zeroed */ EXTRACHECKS_BUG_ON(cmd->bufflen != 0); cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_lba_8_none(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off); /* It supposed to be already zeroed */ EXTRACHECKS_BUG_ON(cmd->bufflen != 0); cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_lba_4_len_2(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off); cmd->bufflen = get_unaligned_be16(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_read_10(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = get_cdb_info_lba_4_len_2(cmd, sdbops); if (res != 0) return res; else { #ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS EXTRACHECKS_BUG_ON(cmd->cdb[0] != READ_10); cmd->cmd_corrupt_dif_tag = (cmd->cdb[6] & 0xE0) >> 5; #endif return scst_parse_rdprotect(cmd); } } static int get_cdb_info_lba_4_len_2_wrprotect(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = get_cdb_info_lba_4_len_2(cmd, sdbops); if (res != 0) return res; else return scst_parse_wrprotect(cmd); } static inline int get_cdb_info_lba_4_len_4(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off); cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_lba_4_len_4_rdprotect(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = get_cdb_info_lba_4_len_4(cmd, sdbops); if (res != 0) return res; else return scst_parse_rdprotect(cmd); } static int get_cdb_info_lba_4_len_4_wrprotect(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = get_cdb_info_lba_4_len_4(cmd, sdbops); if (res != 0) return res; else return scst_parse_wrprotect(cmd); } static inline int get_cdb_info_lba_8_len_4(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off); cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off); cmd->data_len = cmd->bufflen; return 0; } static int get_cdb_info_read_16(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = get_cdb_info_lba_8_len_4(cmd, sdbops); if (res != 0) return res; else { #ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS EXTRACHECKS_BUG_ON(cmd->cdb[0] != READ_16); cmd->cmd_corrupt_dif_tag = (cmd->cdb[14] & 0xE0) >> 5; #endif return scst_parse_rdprotect(cmd); } } static int get_cdb_info_lba_8_len_4_wrprotect(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = get_cdb_info_lba_8_len_4(cmd, sdbops); if (res != 0) return res; else return scst_parse_wrprotect(cmd); } static int get_cdb_info_lba_8_len_4_wrprotect32(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = get_cdb_info_lba_8_len_4(cmd, sdbops); if (res != 0) return res; else return scst_parse_wrprotect32(cmd); } static int get_cdb_info_lba_8_len_4_rdprotect32(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res = get_cdb_info_lba_8_len_4(cmd, sdbops); if (res != 0) return res; else return scst_parse_rdprotect32(cmd); } static int get_cdb_info_write_same(struct scst_cmd *cmd, const struct scst_sdbops *sdbops, const bool ndob) { const uint8_t ctrl_offs = cmd->cdb_len < 32 ? 1 : 10; const bool anchor = (cmd->cdb[ctrl_offs] >> 4) & 1; const bool unmap = (cmd->cdb[ctrl_offs] >> 3) & 1; if (!unmap && (anchor || ndob)) { PRINT_ERROR("Received invalid %s command (UNMAP = %d;" " ANCHOR = %d; NDOB = %d)", scst_get_opcode_name(cmd), unmap, anchor, ndob); scst_set_invalid_field_in_cdb(cmd, ctrl_offs, SCST_INVAL_FIELD_BIT_OFFS_VALID | (ndob ? 0 : 4)); return 1; } if (ndob) { cmd->bufflen = 0; cmd->data_direction = SCST_DATA_NONE; } else { cmd->bufflen = 1; cmd->data_direction = SCST_DATA_WRITE; } return cmd->cdb_len < 32 ? scst_parse_wrprotect(cmd) : scst_parse_wrprotect32(cmd); } static int get_cdb_info_write_same10(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off); cmd->data_len = get_unaligned_be16(cmd->cdb + sdbops->info_len_off); return get_cdb_info_write_same(cmd, sdbops, false); } static int get_cdb_info_write_same16(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off); cmd->data_len = get_unaligned_be32(cmd->cdb + sdbops->info_len_off); return get_cdb_info_write_same(cmd, sdbops, cmd->cdb[1] & 1 /*NDOB*/); } static int get_cdb_info_write_same32(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off); cmd->data_len = get_unaligned_be32(cmd->cdb + sdbops->info_len_off); return get_cdb_info_write_same(cmd, sdbops, cmd->cdb[10] & 1 /*NDOB*/); } static int scst_set_cmd_from_cdb_info(struct scst_cmd *cmd, const struct scst_sdbops *ptr) { cmd->cdb_len = SCST_GET_CDB_LEN(cmd->cdb[0]); cmd->cmd_naca = (cmd->cdb[cmd->cdb_len - 1] & CONTROL_BYTE_NACA_BIT); cmd->cmd_linked = (cmd->cdb[cmd->cdb_len - 1] & CONTROL_BYTE_LINK_BIT); cmd->op_name = ptr->info_op_name; cmd->data_direction = ptr->info_data_direction; cmd->op_flags = ptr->info_op_flags | SCST_INFO_VALID; cmd->lba_off = ptr->info_lba_off; cmd->lba_len = ptr->info_lba_len; cmd->len_off = ptr->info_len_off; cmd->len_len = ptr->info_len_len; return (*ptr->get_cdb_info)(cmd, ptr); } static int get_cdb_info_var_len(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { int res; /* * !! Indexed by (cdb[8-9] - SUBCODE_READ_32), the smallest subcode, * !! hence all items in the array MUST be sorted and with NO HOLES * !! in ops field! */ static const struct scst_sdbops scst_scsi_op32_table[] = { {.ops = 0x7F, .devkey = "O ", .info_op_name = "READ(32)", .info_data_direction = SCST_DATA_READ, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| #ifdef CONFIG_SCST_TEST_IO_IN_SIRQ SCST_TEST_IO_IN_SIRQ_ALLOWED| #endif SCST_WRITE_EXCL_ALLOWED, .info_lba_off = 12, .info_lba_len = 8, .info_len_off = 28, .info_len_len = 4, .get_cdb_info = get_cdb_info_lba_8_len_4_rdprotect32}, {.ops = 0x7F, .devkey = "O ", .info_op_name = "VERIFY(32)", .info_data_direction = SCST_DATA_UNKNOWN, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED, .info_lba_off = 12, .info_lba_len = 8, .info_len_off = 28, .info_len_len = 4, .get_cdb_info = get_cdb_info_verify32}, {.ops = 0x7F, .devkey = "O ", .info_op_name = "WRITE(32)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED| #ifdef CONFIG_SCST_TEST_IO_IN_SIRQ SCST_TEST_IO_IN_SIRQ_ALLOWED| #endif SCST_WRITE_MEDIUM, .info_lba_off = 12, .info_lba_len = 8, .info_len_off = 28, .info_len_len = 4, .get_cdb_info = get_cdb_info_lba_8_len_4_wrprotect32}, {.ops = 0x7F, .devkey = "O ", .info_op_name = "WRITE AND VERIFY(32)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM, .info_lba_off = 12, .info_lba_len = 8, .info_len_off = 28, .info_len_len = 4, .get_cdb_info = get_cdb_info_lba_8_len_4_wrprotect32}, {.ops = 0x7F, .devkey = "O ", .info_op_name = "WRITE SAME(32)", .info_data_direction = SCST_DATA_WRITE, .info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM, .info_lba_off = 12, .info_lba_len = 8, .info_len_off = 28, .info_len_len = 4, .get_cdb_info = get_cdb_info_write_same32}, }; const struct scst_sdbops *ptr; int subcode = be16_to_cpu(*(__be16 *)&cmd->cdb[8]); unsigned int i = subcode - SUBCODE_READ_32; EXTRACHECKS_BUG_ON(cmd->cdb[0] != 0x7F); EXTRACHECKS_BUG_ON(sdbops->ops != 0x7F); /* i is unsigned, so this will handle subcodes < READ_32 as well */ if (unlikely(i >= ARRAY_SIZE(scst_scsi_op32_table))) { TRACE(TRACE_MINOR, "Too big cmd index %d for 0x7F CDB (cmd %p)", i, cmd); goto out_unknown; } ptr = &scst_scsi_op32_table[i]; #if 0 /* not possible */ if (unlikely(ptr == NULL)) goto out_unknown; #endif if (unlikely(cmd->cdb[7] != 0x18)) { TRACE(TRACE_MINOR, "Incorrect ADDITIONAL CDB LENGTH %d for " "0x7F CDB (cmd %p)", cmd->cdb[7], cmd); cmd->op_flags |= SCST_LBA_NOT_VALID; scst_set_invalid_field_in_cdb(cmd, 7, 0); res = 1; /* command invalid */ goto out; } res = scst_set_cmd_from_cdb_info(cmd, ptr); cmd->cmd_naca = (cmd->cdb[1] & CONTROL_BYTE_NACA_BIT); cmd->cmd_linked = (cmd->cdb[1] & CONTROL_BYTE_LINK_BIT); out: TRACE_EXIT_RES(res); return res; out_unknown: TRACE(TRACE_MINOR, "Unknown opcode 0x%x, subcode %d for type %d", cmd->cdb[0], subcode, cmd->dev->type); cmd->op_flags &= ~SCST_INFO_VALID; res = -1; /* command unknown */ goto out; } static int get_cdb_info_compare_and_write(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off); cmd->data_len = cmd->cdb[sdbops->info_len_off]; cmd->bufflen = 2 * cmd->data_len; return scst_parse_wrprotect(cmd); } static int get_cdb_info_ext_copy(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { if (unlikely(cmd->cdb[1] != 0)) { PRINT_WARNING("Not supported %s service action 0x%x", scst_get_opcode_name(cmd), cmd->cdb[1]); scst_set_invalid_field_in_cdb(cmd, 1, 0 | SCST_INVAL_FIELD_BIT_OFFS_VALID); return 1; } return get_cdb_info_len_4(cmd, sdbops); } /** * get_cdb_info_apt() - Parse ATA PASS-THROUGH CDB. * * Parse ATA PASS-THROUGH(12) and ATA PASS-THROUGH(16). See also SAT-3 for a * detailed description of these commands. */ static int get_cdb_info_apt(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { const u8 *const cdb = cmd->cdb; const u8 op = cdb[0]; const u8 extend = cdb[1] & 1; const u8 multiple = cdb[1] >> 5; const u8 protocol = (cdb[1] >> 1) & 0xf; const u8 t_type = (cdb[2] >> 4) & 1; const u8 t_dir = (cdb[2] >> 3) & 1; const u8 byte_block = (cdb[2] >> 2) & 1; const u8 t_length = cdb[2] & 3; int bufflen = 0; /* * If the PROTOCOL field contains Fh (i.e., Return Response * Information), then the SATL shall ignore all fields in the CDB * except for the PROTOCOL field. */ if (protocol == 0xf) goto out; switch (op) { case ATA_12: switch (t_length) { case 0: bufflen = 0; break; case 1: bufflen = cdb[3]; break; case 2: bufflen = cdb[4]; break; case 3: /* * Not yet implemented: "The transfer length is an * unsigned integer specified in the TPSIU (see * 3.1.97)." */ WARN_ON(true); break; } break; case ATA_16: switch (t_length) { case 0: bufflen = 0; break; case 1: bufflen = extend ? get_unaligned_be16(&cdb[3]) : cdb[4]; break; case 2: bufflen = extend ? get_unaligned_be16(&cdb[5]) : cdb[6]; break; case 3: WARN_ON(true); break; } break; } /* See also "Table 133 - Mapping of BYTE_BLOCK, T_TYPE, and T_LENGTH" */ cmd->cdb_len = SCST_GET_CDB_LEN(op); if (t_length != 0 && byte_block != 0) { /* * "The number of ATA logical sector size (see 3.1.16) blocks * to be transferred" */ bufflen *= t_type ? cmd->dev->block_size : 512; } /* * If the T_DIR bit is set to zero, then the SATL shall transfer data * from the application client to the ATA device. If the T_DIR bit is * set to one, then the SATL shall transfer data from the ATA device * to the application client. The SATL shall ignore the T_DIR bit if * the T_LENGTH field is set to zero. */ cmd->data_direction = (t_length == 0 ? SCST_DATA_NONE : t_dir ? SCST_DATA_READ : SCST_DATA_WRITE); cmd->lba = 0; cmd->bufflen = bufflen << multiple; cmd->data_len = cmd->bufflen; out: cmd->op_flags = SCST_INFO_VALID; return 0; } /* Parse MAINTENANCE IN */ static int get_cdb_info_min(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { switch (cmd->cdb[1] & 0x1f) { case MI_REPORT_IDENTIFYING_INFORMATION: cmd->op_name = "REPORT IDENTIFYING INFORMATION"; cmd->op_flags |= SCST_REG_RESERVE_ALLOWED | SCST_WRITE_EXCL_ALLOWED | SCST_EXCL_ACCESS_ALLOWED; break; case MI_REPORT_TARGET_PGS: cmd->op_name = "REPORT TARGET PORT GROUPS"; cmd->op_flags |= SCST_REG_RESERVE_ALLOWED | SCST_WRITE_EXCL_ALLOWED | SCST_EXCL_ACCESS_ALLOWED; break; case MI_REPORT_SUPPORTED_OPERATION_CODES: cmd->op_name = "REPORT SUPPORTED OPERATION CODES"; cmd->op_flags |= SCST_WRITE_EXCL_ALLOWED; if (cmd->devt->get_supported_opcodes != NULL) cmd->op_flags |= SCST_LOCAL_CMD | SCST_FULLY_LOCAL_CMD; break; case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: cmd->op_name = "REPORT SUPPORTED TASK MANAGEMENT FUNCTIONS"; cmd->op_flags |= SCST_WRITE_EXCL_ALLOWED | SCST_LOCAL_CMD | SCST_FULLY_LOCAL_CMD; break; default: break; } return get_cdb_info_len_4(cmd, sdbops); } /* Parse MAINTENANCE (OUT) */ static int get_cdb_info_mo(struct scst_cmd *cmd, const struct scst_sdbops *sdbops) { switch (cmd->cdb[1] & 0x1f) { case MO_SET_TARGET_PGS: { unsigned long flags; cmd->op_name = "SET TARGET PORT GROUPS"; cmd->op_flags |= SCST_STRICTLY_SERIALIZED; spin_lock_irqsave(&scst_global_stpg_list_lock, flags); TRACE_DBG("Adding STPG cmd %p to global_stpg_list", cmd); cmd->cmd_on_global_stpg_list = 1; list_add_tail(&cmd->global_stpg_list_entry, &scst_global_stpg_list); spin_unlock_irqrestore(&scst_global_stpg_list_lock, flags); break; } } return get_cdb_info_len_4(cmd, sdbops); } /** * scst_get_cdb_info() - fill various info about the command's CDB * * Description: * Fills various info about the command's CDB in the corresponding fields * in the command. * * Returns: 0 on success, <0 if command is unknown, >0 if command * is invalid. */ int scst_get_cdb_info(struct scst_cmd *cmd) { int dev_type = cmd->dev->type; int i, res = 0; uint8_t op; const struct scst_sdbops *ptr = NULL; TRACE_ENTRY(); op = cmd->cdb[0]; /* get clear opcode */ TRACE_DBG("opcode=%02x, cdblen=%d bytes, dev_type=%d", op, SCST_GET_CDB_LEN(op), dev_type); i = scst_scsi_op_list[op]; while (i < SCST_CDB_TBL_SIZE && scst_scsi_op_table[i].ops == op) { if (scst_scsi_op_table[i].devkey[dev_type] != SCST_CDB_NOTSUPP) { ptr = &scst_scsi_op_table[i]; TRACE_DBG("op = 0x%02x+'%c%c%c%c%c%c%c%c%c%c'+<%s>", ptr->ops, ptr->devkey[0], /* disk */ ptr->devkey[1], /* tape */ ptr->devkey[2], /* printer */ ptr->devkey[3], /* cpu */ ptr->devkey[4], /* cdr */ ptr->devkey[5], /* cdrom */ ptr->devkey[6], /* scanner */ ptr->devkey[7], /* worm */ ptr->devkey[8], /* changer */ ptr->devkey[9], /* commdev */ ptr->info_op_name); TRACE_DBG("data direction %d, op flags 0x%x, lba off %d, " "lba len %d, len off %d, len len %d", ptr->info_data_direction, ptr->info_op_flags, ptr->info_lba_off, ptr->info_lba_len, ptr->info_len_off, ptr->info_len_len); break; } i++; } if (unlikely(ptr == NULL)) { /* opcode not found or now not used */ TRACE(TRACE_MINOR, "Unknown opcode 0x%x for type %d", op, dev_type); cmd->op_flags |= SCST_LBA_NOT_VALID; res = -1; goto out; } res = scst_set_cmd_from_cdb_info(cmd, ptr); out: TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL_GPL(scst_get_cdb_info); /* Packs SCST LUN back to SCSI form */ __be64 scst_pack_lun(const uint64_t lun, enum scst_lun_addr_method addr_method) { uint64_t res = 0; if (lun) { res = (addr_method << 14) | (lun & 0x3fff); res = res << 48; } TRACE_EXIT_HRES(res >> 48); return cpu_to_be64(res); } EXPORT_SYMBOL(scst_pack_lun); /* * Function to extract a LUN number from an 8-byte LUN structure in network byte * order (big endian). Supports three LUN addressing methods: peripheral, flat * and logical unit. See also SAM-2, section 4.9.4 (page 40). */ uint64_t scst_unpack_lun(const uint8_t *lun, int len) { uint64_t res = NO_SUCH_LUN; int address_method; TRACE_ENTRY(); TRACE_BUFF_FLAG(TRACE_DEBUG, "Raw LUN", lun, len); switch (len) { case 2: break; case 8: if ((*((__be64 const *)lun) & cpu_to_be64(0x0000FFFFFFFFFFFFLL)) != 0) goto out_err; break; case 4: if (*((__be16 const *)&lun[2]) != 0) goto out_err; break; case 6: if (*((__be32 const *)&lun[2]) != 0) goto out_err; break; case 1: case 0: PRINT_ERROR("Illegal lun length %d, expected 2 bytes " "or more", len); goto out; default: goto out_err; } address_method = (*lun) >> 6; /* high 2 bits of byte 0 */ switch (address_method) { case SCST_LUN_ADDR_METHOD_PERIPHERAL: case SCST_LUN_ADDR_METHOD_FLAT: case SCST_LUN_ADDR_METHOD_LUN: res = *(lun + 1) | (((*lun) & 0x3f) << 8); break; case SCST_LUN_ADDR_METHOD_EXTENDED_LUN: default: PRINT_ERROR("Unimplemented LUN addressing method %u", address_method); break; } out: TRACE_EXIT_RES((int)res); return res; out_err: PRINT_ERROR("%s", "Multi-level LUN unimplemented"); goto out; } EXPORT_SYMBOL(scst_unpack_lun); /** ** Generic parse() support routines. ** Done via pointer on functions to avoid unneeded dereferences on ** the fast path. **/ /** * scst_calc_block_shift() - calculate block shift * * Calculates and returns block shift for the given sector size */ int scst_calc_block_shift(int sector_size) { int block_shift; if (sector_size == 0) sector_size = 512; block_shift = ilog2(sector_size); WARN_ONCE(1 << block_shift != sector_size, "1 << %d != %d\n", block_shift, sector_size); if (block_shift < 9) { PRINT_ERROR("Wrong sector size %d", sector_size); block_shift = -1; } TRACE_EXIT_RES(block_shift); return block_shift; } EXPORT_SYMBOL_GPL(scst_calc_block_shift); /* * Test whether the result of a shift-left operation would be larger than * what fits in a variable with the type of @a. */ #define shift_left_overflows(a, b) \ ({ \ typeof(a) _minus_one = -1LL; \ typeof(a) _plus_one = 1; \ bool _a_is_signed = _minus_one < 0; \ int _shift = sizeof(a) * 8 - ((b) + _a_is_signed); \ _shift < 0 || ((a) & ~((_plus_one << _shift) - 1)) != 0;\ }) /** * scst_generic_parse() - Generic parse() for devices supporting an LBA */ static inline int scst_generic_parse(struct scst_cmd *cmd, const int timeout[3]) { const int block_shift = cmd->dev->block_shift; int res = -EINVAL; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(block_shift < 0); /* * SCST sets good defaults for cmd->data_direction and cmd->bufflen, * therefore change them only if necessary */ if (cmd->op_flags & SCST_TRANSFER_LEN_TYPE_FIXED) { /* * No need for locks here, since *_detach() can not be * called, when there are existing commands. */ bool overflow = shift_left_overflows(cmd->bufflen, block_shift) || shift_left_overflows(cmd->data_len, block_shift) || shift_left_overflows(cmd->out_bufflen, block_shift); if (unlikely(overflow)) { PRINT_WARNING("bufflen %u, data_len %llu or out_bufflen" " %u too large for device %s (block size" " %u)", cmd->bufflen, cmd->data_len, cmd->out_bufflen, cmd->dev->virt_name, 1 << block_shift); PRINT_BUFFER("CDB", cmd->cdb, cmd->cdb_len); scst_set_cmd_error(cmd, SCST_LOAD_SENSE( scst_sense_block_out_range_error)); goto out; } cmd->bufflen = cmd->bufflen << block_shift; cmd->data_len = cmd->data_len << block_shift; cmd->out_bufflen = cmd->out_bufflen << block_shift; } if (unlikely(!(cmd->op_flags & SCST_LBA_NOT_VALID) && shift_left_overflows(cmd->lba, block_shift))) { PRINT_WARNING("offset %llu * %u >= 2**63 for device %s (len %lld)", cmd->lba, 1 << block_shift, cmd->dev->virt_name, cmd->data_len); scst_set_cmd_error(cmd, SCST_LOAD_SENSE( scst_sense_block_out_range_error)); goto out; } cmd->timeout = timeout[cmd->op_flags & SCST_BOTH_TIMEOUTS]; res = 0; out: TRACE_DBG("res %d, bufflen %d, data_len %lld, direct %d", res, cmd->bufflen, (long long)cmd->data_len, cmd->data_direction); TRACE_EXIT_RES(res); return res; } /** * scst_sbc_generic_parse() - generic SBC parsing * * Generic parse() for SBC (disk) devices */ int scst_sbc_generic_parse(struct scst_cmd *cmd) { static const int disk_timeout[] = { [0] = SCST_GENERIC_DISK_REG_TIMEOUT, [SCST_SMALL_TIMEOUT] = SCST_GENERIC_DISK_SMALL_TIMEOUT, [SCST_LONG_TIMEOUT] = SCST_GENERIC_DISK_LONG_TIMEOUT, [SCST_BOTH_TIMEOUTS] = SCST_GENERIC_DISK_LONG_TIMEOUT, }; BUILD_BUG_ON(SCST_SMALL_TIMEOUT != 1); BUILD_BUG_ON(SCST_LONG_TIMEOUT != 2); BUILD_BUG_ON(SCST_BOTH_TIMEOUTS != 3); return scst_generic_parse(cmd, disk_timeout); } EXPORT_SYMBOL_GPL(scst_sbc_generic_parse); /** * scst_cdrom_generic_parse() - generic MMC parse * * Generic parse() for MMC (cdrom) devices */ int scst_cdrom_generic_parse(struct scst_cmd *cmd) { static const int cdrom_timeout[] = { [0] = SCST_GENERIC_CDROM_REG_TIMEOUT, [SCST_SMALL_TIMEOUT] = SCST_GENERIC_CDROM_SMALL_TIMEOUT, [SCST_LONG_TIMEOUT] = SCST_GENERIC_CDROM_LONG_TIMEOUT, [SCST_BOTH_TIMEOUTS] = SCST_GENERIC_CDROM_LONG_TIMEOUT, }; BUILD_BUG_ON(SCST_SMALL_TIMEOUT != 1); BUILD_BUG_ON(SCST_LONG_TIMEOUT != 2); BUILD_BUG_ON(SCST_BOTH_TIMEOUTS != 3); cmd->cdb[1] &= 0x1f; return scst_generic_parse(cmd, cdrom_timeout); } EXPORT_SYMBOL_GPL(scst_cdrom_generic_parse); /** * scst_modisk_generic_parse() - generic MO parse * * Generic parse() for MO disk devices */ int scst_modisk_generic_parse(struct scst_cmd *cmd) { static const int modisk_timeout[] = { [0] = SCST_GENERIC_MODISK_REG_TIMEOUT, [SCST_SMALL_TIMEOUT] = SCST_GENERIC_MODISK_SMALL_TIMEOUT, [SCST_LONG_TIMEOUT] = SCST_GENERIC_MODISK_LONG_TIMEOUT, [SCST_BOTH_TIMEOUTS] = SCST_GENERIC_MODISK_LONG_TIMEOUT, }; BUILD_BUG_ON(SCST_SMALL_TIMEOUT != 1); BUILD_BUG_ON(SCST_LONG_TIMEOUT != 2); BUILD_BUG_ON(SCST_BOTH_TIMEOUTS != 3); cmd->cdb[1] &= 0x1f; return scst_generic_parse(cmd, modisk_timeout); } EXPORT_SYMBOL_GPL(scst_modisk_generic_parse); /** * scst_tape_generic_parse() - generic tape parse * * Generic parse() for tape devices */ int scst_tape_generic_parse(struct scst_cmd *cmd) { int res = 0; TRACE_ENTRY(); /* * SCST sets good defaults for cmd->data_direction and cmd->bufflen, * therefore change them only if necessary */ if (cmd->op_flags & SCST_TRANSFER_LEN_TYPE_FIXED && cmd->cdb[1] & 1) { int block_size = cmd->dev->block_size; uint64_t b, ob; bool overflow; b = ((uint64_t)cmd->bufflen) * block_size; ob = ((uint64_t)cmd->out_bufflen) * block_size; overflow = (b > 0xFFFFFFFF) || (ob > 0xFFFFFFFF); if (unlikely(overflow)) { PRINT_WARNING("bufflen %u, data_len %llu or out_bufflen" " %u too large for device %s (block size" " %u, b %llu, ob %llu)", cmd->bufflen, cmd->data_len, cmd->out_bufflen, cmd->dev->virt_name, block_size, b, ob); PRINT_BUFFER("CDB", cmd->cdb, cmd->cdb_len); scst_set_cmd_error(cmd, SCST_LOAD_SENSE( scst_sense_block_out_range_error)); res = -EINVAL; goto out; } cmd->bufflen = b; cmd->out_bufflen = ob; /* cmd->data_len is 64-bit, so can't overflow here */ BUILD_BUG_ON(sizeof(cmd->data_len) < 8); cmd->data_len *= block_size; } if ((cmd->op_flags & (SCST_SMALL_TIMEOUT | SCST_LONG_TIMEOUT)) == 0) cmd->timeout = SCST_GENERIC_TAPE_REG_TIMEOUT; else if (cmd->op_flags & SCST_SMALL_TIMEOUT) cmd->timeout = SCST_GENERIC_TAPE_SMALL_TIMEOUT; else if (cmd->op_flags & SCST_LONG_TIMEOUT) cmd->timeout = SCST_GENERIC_TAPE_LONG_TIMEOUT; out: TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL_GPL(scst_tape_generic_parse); static int scst_null_parse(struct scst_cmd *cmd) { int res = 0; TRACE_ENTRY(); /* * SCST sets good defaults for cmd->data_direction and cmd->bufflen, * therefore change them only if necessary */ #if 0 switch (cmd->cdb[0]) { default: /* It's all good */ break; } #endif TRACE_DBG("res %d bufflen %d direct %d", res, cmd->bufflen, cmd->data_direction); TRACE_EXIT(); return res; } /** * scst_changer_generic_parse() - generic changer parse * * Generic parse() for changer devices */ int scst_changer_generic_parse(struct scst_cmd *cmd) { int res = scst_null_parse(cmd); if (cmd->op_flags & SCST_LONG_TIMEOUT) cmd->timeout = SCST_GENERIC_CHANGER_LONG_TIMEOUT; else cmd->timeout = SCST_GENERIC_CHANGER_TIMEOUT; return res; } EXPORT_SYMBOL_GPL(scst_changer_generic_parse); /** * scst_processor_generic_parse - generic SCSI processor parse * * Generic parse() for SCSI processor devices */ int scst_processor_generic_parse(struct scst_cmd *cmd) { int res = scst_null_parse(cmd); if (cmd->op_flags & SCST_LONG_TIMEOUT) cmd->timeout = SCST_GENERIC_PROCESSOR_LONG_TIMEOUT; else cmd->timeout = SCST_GENERIC_PROCESSOR_TIMEOUT; return res; } EXPORT_SYMBOL_GPL(scst_processor_generic_parse); /** * scst_raid_generic_parse() - generic RAID parse * * Generic parse() for RAID devices */ int scst_raid_generic_parse(struct scst_cmd *cmd) { int res = scst_null_parse(cmd); if (cmd->op_flags & SCST_LONG_TIMEOUT) cmd->timeout = SCST_GENERIC_RAID_LONG_TIMEOUT; else cmd->timeout = SCST_GENERIC_RAID_TIMEOUT; return res; } EXPORT_SYMBOL_GPL(scst_raid_generic_parse); int scst_do_internal_parsing(struct scst_cmd *cmd) { int res, rc; TRACE_ENTRY(); switch (cmd->dev->type) { case TYPE_DISK: rc = scst_sbc_generic_parse(cmd); break; case TYPE_TAPE: rc = scst_tape_generic_parse(cmd); break; case TYPE_PROCESSOR: rc = scst_processor_generic_parse(cmd); break; case TYPE_ROM: rc = scst_cdrom_generic_parse(cmd); break; case TYPE_MOD: rc = scst_modisk_generic_parse(cmd); break; case TYPE_MEDIUM_CHANGER: rc = scst_changer_generic_parse(cmd); break; case TYPE_RAID: rc = scst_raid_generic_parse(cmd); break; default: PRINT_ERROR("Internal parse for type %d not supported", cmd->dev->type); goto out_hw_err; } if (rc != 0) goto out_abn; res = SCST_CMD_STATE_DEFAULT; out: TRACE_EXIT(); return res; out_hw_err: scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_hardw_error)); out_abn: res = scst_get_cmd_abnormal_done_state(cmd); goto out; } /** ** Generic dev_done() support routines. ** Done via pointer on functions to avoid unneeded dereferences on ** the fast path. **/ /** * scst_block_generic_dev_done() - generic SBC dev_done * * Generic dev_done() for block (SBC) devices */ int scst_block_generic_dev_done(struct scst_cmd *cmd, void (*set_block_shift)(struct scst_cmd *cmd, int block_shift)) { int opcode = cmd->cdb[0]; int res = SCST_CMD_STATE_DEFAULT; TRACE_ENTRY(); /* * SCST sets good defaults for cmd->is_send_status and * cmd->resp_data_len based on cmd->status and cmd->data_direction, * therefore change them only if necessary */ /* * Potentially, a pass-through backend device can at any time change * block size behind us, e.g. after FORMAT command, so we need to * somehow detect it. Intercepting READ CAPACITY is, probably, the * simplest, yet sufficient way for that. */ if (unlikely(opcode == READ_CAPACITY)) { if (scst_cmd_completed_good(cmd)) { /* Always keep track of disk capacity */ int buffer_size, sector_size, sh; uint8_t *buffer; buffer_size = scst_get_buf_full(cmd, &buffer); if (unlikely(buffer_size < 8)) { if (buffer_size != 0) { PRINT_ERROR("%s: Unable to get cmd " "buffer (%d)", __func__, buffer_size); } goto out; } sector_size = get_unaligned_be32(&buffer[4]); scst_put_buf_full(cmd, buffer); if (sector_size != 0) sh = scst_calc_block_shift(sector_size); else sh = 0; set_block_shift(cmd, sh); TRACE_DBG("block_shift %d", sh); } } else /* ToDo: add READ CAPACITY(16) here */ { /* It's all good */ } TRACE_DBG("cmd->is_send_status=%x, cmd->resp_data_len=%d, " "res=%d", cmd->is_send_status, cmd->resp_data_len, res); out: TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL_GPL(scst_block_generic_dev_done); /** * scst_tape_generic_dev_done() - generic tape dev done * * Generic dev_done() for tape devices */ int scst_tape_generic_dev_done(struct scst_cmd *cmd, void (*set_block_size)(struct scst_cmd *cmd, int block_shift)) { int opcode = cmd->cdb[0]; int res = SCST_CMD_STATE_DEFAULT; int buffer_size, bs; uint8_t *buffer = NULL; TRACE_ENTRY(); /* * SCST sets good defaults for cmd->is_send_status and * cmd->resp_data_len based on cmd->status and cmd->data_direction, * therefore change them only if necessary */ if (unlikely(!scst_cmd_completed_good(cmd))) goto out; switch (opcode) { case MODE_SENSE: case MODE_SELECT: buffer_size = scst_get_buf_full(cmd, &buffer); if (unlikely(buffer_size <= 0)) { if (buffer_size < 0) { PRINT_ERROR("%s: Unable to get the buffer (%d)", __func__, buffer_size); } goto out; } break; } switch (opcode) { case MODE_SENSE: TRACE_DBG("%s", "MODE_SENSE"); if ((cmd->cdb[2] & 0xC0) == 0) { if (buffer[3] == 8) { bs = get_unaligned_be24(&buffer[9]); set_block_size(cmd, bs); } } break; case MODE_SELECT: TRACE_DBG("%s", "MODE_SELECT"); if (buffer[3] == 8) { bs = get_unaligned_be24(&buffer[9]); set_block_size(cmd, bs); } break; default: /* It's all good */ break; } switch (opcode) { case MODE_SENSE: case MODE_SELECT: scst_put_buf_full(cmd, buffer); break; } out: TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL_GPL(scst_tape_generic_dev_done); typedef void (*scst_set_cdb_lba_fn_t)(struct scst_cmd *cmd, int64_t lba); static void scst_set_cdb_lba1(struct scst_cmd *cmd, int64_t lba) { TRACE_ENTRY(); cmd->cdb[cmd->lba_off] = lba; TRACE_EXIT(); return; } static void scst_set_cdb_lba2(struct scst_cmd *cmd, int64_t lba) { TRACE_ENTRY(); put_unaligned_be16(lba, &cmd->cdb[cmd->lba_off]); TRACE_EXIT(); return; } static void scst_set_cdb_lba3(struct scst_cmd *cmd, int64_t lba) { TRACE_ENTRY(); put_unaligned_be24(lba, &cmd->cdb[cmd->lba_off]); TRACE_EXIT(); return; } static void scst_set_cdb_lba4(struct scst_cmd *cmd, int64_t lba) { TRACE_ENTRY(); put_unaligned_be32(lba, &cmd->cdb[cmd->lba_off]); TRACE_EXIT(); return; } static void scst_set_cdb_lba8(struct scst_cmd *cmd, int64_t lba) { TRACE_ENTRY(); put_unaligned_be64(lba, &cmd->cdb[cmd->lba_off]); TRACE_EXIT(); return; } static const scst_set_cdb_lba_fn_t scst_set_cdb_lba_fns[9] = { [1] = scst_set_cdb_lba1, [2] = scst_set_cdb_lba2, [3] = scst_set_cdb_lba3, [4] = scst_set_cdb_lba4, [8] = scst_set_cdb_lba8, }; int scst_set_cdb_lba(struct scst_cmd *cmd, int64_t lba) { int res; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(cmd->op_flags & SCST_LBA_NOT_VALID); scst_set_cdb_lba_fns[cmd->lba_len](cmd, lba); res = 0; TRACE_DBG("cmd %p, new LBA %lld", cmd, (unsigned long long)lba); TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL_GPL(scst_set_cdb_lba); typedef void (*scst_set_cdb_transf_len_fn_t)(struct scst_cmd *cmd, int len); static void scst_set_cdb_transf_len1(struct scst_cmd *cmd, int len) { TRACE_ENTRY(); cmd->cdb[cmd->len_off] = len; TRACE_EXIT(); return; } static void scst_set_cdb_transf_len2(struct scst_cmd *cmd, int len) { TRACE_ENTRY(); put_unaligned_be16(len, &cmd->cdb[cmd->len_off]); TRACE_EXIT(); return; } static void scst_set_cdb_transf_len3(struct scst_cmd *cmd, int len) { TRACE_ENTRY(); put_unaligned_be24(len, &cmd->cdb[cmd->len_off]); TRACE_EXIT(); return; } static void scst_set_cdb_transf_len4(struct scst_cmd *cmd, int len) { TRACE_ENTRY(); put_unaligned_be32(len, &cmd->cdb[cmd->len_off]); TRACE_EXIT(); return; } static void scst_set_cdb_transf_len8(struct scst_cmd *cmd, int len) { TRACE_ENTRY(); put_unaligned_be64(len, &cmd->cdb[cmd->len_off]); TRACE_EXIT(); return; } static const scst_set_cdb_transf_len_fn_t scst_set_cdb_transf_len_fns[9] = { [1] = scst_set_cdb_transf_len1, [2] = scst_set_cdb_transf_len2, [3] = scst_set_cdb_transf_len3, [4] = scst_set_cdb_transf_len4, [8] = scst_set_cdb_transf_len8, }; int scst_set_cdb_transf_len(struct scst_cmd *cmd, int len) { int res; TRACE_ENTRY(); scst_set_cdb_transf_len_fns[cmd->len_len](cmd, len); res = 0; TRACE_DBG("cmd %p, new len %d", cmd, len); TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL_GPL(scst_set_cdb_transf_len); static void scst_check_internal_sense(struct scst_device *dev, int result, uint8_t *sense, int sense_len) { TRACE_ENTRY(); if (host_byte(result) == DID_RESET) { int sl; TRACE(TRACE_MGMT, "DID_RESET received for device %s, " "triggering reset UA", dev->virt_name); sl = scst_set_sense(sense, sense_len, dev->d_sense, SCST_LOAD_SENSE(scst_sense_reset_UA)); scst_dev_check_set_UA(dev, NULL, sense, sl); } else if ((status_byte(result) == CHECK_CONDITION) && scst_is_ua_sense(sense, sense_len)) scst_dev_check_set_UA(dev, NULL, sense, sense_len); TRACE_EXIT(); return; } /** * scst_to_dma_dir() - translate SCST's data direction to DMA direction * * Translates SCST's data direction to DMA one from backend storage * perspective. */ enum dma_data_direction scst_to_dma_dir(int scst_dir) { static const enum dma_data_direction tr_tbl[] = { DMA_NONE, DMA_TO_DEVICE, DMA_FROM_DEVICE, DMA_BIDIRECTIONAL, DMA_NONE }; return tr_tbl[scst_dir]; } EXPORT_SYMBOL(scst_to_dma_dir); /* * scst_to_tgt_dma_dir() - translate SCST data direction to DMA direction * * Translates SCST data direction to DMA data direction from the perspective * of a target. */ enum dma_data_direction scst_to_tgt_dma_dir(int scst_dir) { static const enum dma_data_direction tr_tbl[] = { DMA_NONE, DMA_FROM_DEVICE, DMA_TO_DEVICE, DMA_BIDIRECTIONAL, DMA_NONE }; return tr_tbl[scst_dir]; } EXPORT_SYMBOL(scst_to_tgt_dma_dir); /* * Called under dev_lock and BH off. * * !! scst_unblock_aborted_cmds() must be called after this function !! */ void scst_process_reset(struct scst_device *dev, struct scst_session *originator, struct scst_cmd *exclude_cmd, struct scst_mgmt_cmd *mcmd, bool setUA) { struct scst_tgt_dev *tgt_dev; struct scst_cmd *cmd; TRACE_ENTRY(); /* Clear RESERVE'ation, if necessary */ scst_clear_dev_reservation(dev); /* * There is no need to send RELEASE, since the device is going * to be reset. Actually, since we can be in RESET TM * function, it might be dangerous. */ dev->dev_double_ua_possible = 1; list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { struct scst_session *sess = tgt_dev->sess; #if 0 /* Clearing UAs and last sense isn't required by SAM and it * looks to be better to not clear them to not loose important * events, so let's disable it. */ spin_lock_bh(&tgt_dev->tgt_dev_lock); scst_free_all_UA(tgt_dev); memset(tgt_dev->tgt_dev_sense, 0, sizeof(tgt_dev->tgt_dev_sense)); spin_unlock_bh(&tgt_dev->tgt_dev_lock); #endif spin_lock_irq(&sess->sess_list_lock); TRACE_DBG("Searching in sess cmd list (sess=%p)", sess); list_for_each_entry(cmd, &sess->sess_cmd_list, sess_cmd_list_entry) { if (cmd == exclude_cmd) continue; if ((cmd->tgt_dev == tgt_dev) || ((cmd->tgt_dev == NULL) && (cmd->lun == tgt_dev->lun))) { scst_abort_cmd(cmd, mcmd, (tgt_dev->sess != originator), 0); } } spin_unlock_irq(&sess->sess_list_lock); } /* * We need at first abort all affected commands and only then * release them as part of clearing ACA */ list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { scst_clear_aca(tgt_dev, (tgt_dev->sess != originator)); } if (setUA) { uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN]; int sl = scst_set_sense(sense_buffer, sizeof(sense_buffer), dev->d_sense, SCST_LOAD_SENSE(scst_sense_reset_UA)); /* * Potentially, setting UA here, when the aborted commands are * still running, can lead to a situation that one of them could * take it, then that would be detected and the UA requeued. * But, meanwhile, one or more subsequent, i.e. not aborted, * commands can "leak" executed normally. So, as result, the * UA would be delivered one or more commands "later". However, * that should be OK, because, if multiple commands are being * executed in parallel, you can't control exact order of UA * delivery anyway. */ scst_dev_check_set_local_UA(dev, exclude_cmd, sense_buffer, sl); } TRACE_EXIT(); return; } /* Caller must hold tgt_dev->tgt_dev_lock. */ void scst_tgt_dev_del_free_UA(struct scst_tgt_dev *tgt_dev, struct scst_tgt_dev_UA *ua) { list_del(&ua->UA_list_entry); if (list_empty(&tgt_dev->UA_list)) clear_bit(SCST_TGT_DEV_UA_PENDING, &tgt_dev->tgt_dev_flags); mempool_free(ua, scst_ua_mempool); } /* No locks, no IRQ or IRQ-disabled context allowed */ int scst_set_pending_UA(struct scst_cmd *cmd, uint8_t *buf, int *size) { int res = 0, i; struct scst_tgt_dev_UA *UA_entry; bool first = true, global_unlock = false; struct scst_session *sess = cmd->sess; TRACE_ENTRY(); /* * RMB and recheck to sync with setting SCST_CMD_ABORTED in * scst_abort_cmd() to not set UA for the being aborted cmd, hence * possibly miss its delivery by a legitimate command while the UA is * being requeued. */ smp_rmb(); if (test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags)) { TRACE_MGMT_DBG("Not set pending UA for aborted cmd %p", cmd); res = -1; goto out; } spin_lock_bh(&cmd->tgt_dev->tgt_dev_lock); again: /* UA list could be cleared behind us, so retest */ if (list_empty(&cmd->tgt_dev->UA_list)) { TRACE_DBG("SCST_TGT_DEV_UA_PENDING set, but UA_list empty"); res = -1; goto out_unlock; } else TRACE_MGMT_DBG("Setting pending UA cmd %p (tgt_dev %p, dev %s, " "initiator %s)", cmd, cmd->tgt_dev, cmd->dev->virt_name, cmd->sess->initiator_name); UA_entry = list_first_entry(&cmd->tgt_dev->UA_list, typeof(*UA_entry), UA_list_entry); TRACE_DBG("Setting pending UA %p to cmd %p", UA_entry, cmd); if (UA_entry->global_UA && first) { TRACE_MGMT_DBG("Global UA %p detected", UA_entry); #if !defined(__CHECKER__) spin_unlock_bh(&cmd->tgt_dev->tgt_dev_lock); /* * cmd won't allow to suspend activities, so we can access * sess->sess_tgt_dev_list without any additional * protection. */ local_bh_disable(); for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { struct list_head *head = &sess->sess_tgt_dev_list[i]; struct scst_tgt_dev *tgt_dev; list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) { /* Lockdep triggers here a false positive.. */ spin_lock_nolockdep(&tgt_dev->tgt_dev_lock); } } #endif first = false; global_unlock = true; goto again; } if (buf == NULL) { if (scst_set_cmd_error_sense(cmd, UA_entry->UA_sense_buffer, UA_entry->UA_valid_sense_len) != 0) goto out_unlock; } else { sBUG_ON(*size == 0); if (UA_entry->UA_valid_sense_len > *size) { TRACE(TRACE_MINOR, "%s: Being returned UA truncated " "to size %d (needed %d)", cmd->op_name, *size, UA_entry->UA_valid_sense_len); *size = UA_entry->UA_valid_sense_len; } TRACE_DBG("Returning UA in buffer %p (size %d)", buf, *size); memcpy(buf, UA_entry->UA_sense_buffer, *size); *size = UA_entry->UA_valid_sense_len; } cmd->ua_ignore = 1; list_del(&UA_entry->UA_list_entry); if (UA_entry->global_UA) { for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { struct list_head *head = &sess->sess_tgt_dev_list[i]; struct scst_tgt_dev *tgt_dev; list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) { struct scst_tgt_dev_UA *ua; list_for_each_entry(ua, &tgt_dev->UA_list, UA_list_entry) { if (ua->global_UA && memcmp(ua->UA_sense_buffer, UA_entry->UA_sense_buffer, sizeof(ua->UA_sense_buffer)) == 0) { TRACE_MGMT_DBG("Freeing not " "needed global UA %p", ua); scst_tgt_dev_del_free_UA(tgt_dev, ua); break; } } } } } mempool_free(UA_entry, scst_ua_mempool); if (list_empty(&cmd->tgt_dev->UA_list)) { clear_bit(SCST_TGT_DEV_UA_PENDING, &cmd->tgt_dev->tgt_dev_flags); } out_unlock: if (global_unlock) { #if !defined(__CHECKER__) for (i = SESS_TGT_DEV_LIST_HASH_SIZE-1; i >= 0; i--) { struct list_head *head = &sess->sess_tgt_dev_list[i]; struct scst_tgt_dev *tgt_dev; list_for_each_entry_reverse(tgt_dev, head, sess_tgt_dev_list_entry) { spin_unlock_nolockdep(&tgt_dev->tgt_dev_lock); } } local_bh_enable(); spin_lock_bh(&cmd->tgt_dev->tgt_dev_lock); #endif } spin_unlock_bh(&cmd->tgt_dev->tgt_dev_lock); out: TRACE_EXIT_RES(res); return res; } /* * Called under tgt_dev_lock and BH off, except when guaranteed that * there's only one user of tgt_dev. */ static void scst_alloc_set_UA(struct scst_tgt_dev *tgt_dev, const uint8_t *sense, int sense_len, int flags) { struct scst_tgt_dev_UA *UA_entry = NULL; TRACE_ENTRY(); UA_entry = mempool_alloc(scst_ua_mempool, GFP_ATOMIC); if (UA_entry == NULL) { PRINT_CRIT_ERROR("%s", "UNIT ATTENTION memory " "allocation failed. The UNIT ATTENTION " "on some sessions will be missed"); PRINT_BUFFER("Lost UA", sense, sense_len); goto out; } memset(UA_entry, 0, sizeof(*UA_entry)); UA_entry->global_UA = (flags & SCST_SET_UA_FLAG_GLOBAL) != 0; TRACE(TRACE_MGMT_DEBUG|TRACE_SCSI, "Queuing new %sUA %p (%x:%x:%x, " "d_sense %d) to tgt_dev %p (dev %s, initiator %s)", UA_entry->global_UA ? "global " : "", UA_entry, sense[2], sense[12], sense[13], tgt_dev->dev->d_sense, tgt_dev, tgt_dev->dev->virt_name, tgt_dev->sess->initiator_name); TRACE_BUFF_FLAG(TRACE_DEBUG, "UA sense", sense, sense_len); if (sense_len > (int)sizeof(UA_entry->UA_sense_buffer)) { PRINT_WARNING("Sense truncated (needed %d), shall you increase " "SCST_SENSE_BUFFERSIZE?", sense_len); sense_len = sizeof(UA_entry->UA_sense_buffer); } memcpy(UA_entry->UA_sense_buffer, sense, sense_len); UA_entry->UA_valid_sense_len = sense_len; set_bit(SCST_TGT_DEV_UA_PENDING, &tgt_dev->tgt_dev_flags); if (flags & SCST_SET_UA_FLAG_AT_HEAD) list_add(&UA_entry->UA_list_entry, &tgt_dev->UA_list); else list_add_tail(&UA_entry->UA_list_entry, &tgt_dev->UA_list); out: TRACE_EXIT(); return; } /* tgt_dev_lock supposed to be held and BH off */ static void __scst_check_set_UA(struct scst_tgt_dev *tgt_dev, const uint8_t *sense, int sense_len, int flags) { int skip_UA = 0; struct scst_tgt_dev_UA *UA_entry_tmp; int len = min_t(int, sizeof(UA_entry_tmp->UA_sense_buffer), sense_len); TRACE_ENTRY(); list_for_each_entry(UA_entry_tmp, &tgt_dev->UA_list, UA_list_entry) { if (memcmp(sense, UA_entry_tmp->UA_sense_buffer, len) == 0) { TRACE_DBG("UA already exists (dev %s, " "initiator %s)", tgt_dev->dev->virt_name, tgt_dev->sess->initiator_name); skip_UA = 1; break; } } if (skip_UA == 0) scst_alloc_set_UA(tgt_dev, sense, len, flags); TRACE_EXIT(); return; } void scst_check_set_UA(struct scst_tgt_dev *tgt_dev, const uint8_t *sense, int sense_len, int flags) { TRACE_ENTRY(); spin_lock_bh(&tgt_dev->tgt_dev_lock); __scst_check_set_UA(tgt_dev, sense, sense_len, flags); spin_unlock_bh(&tgt_dev->tgt_dev_lock); TRACE_EXIT(); return; } /* Called under dev_lock and BH off */ void scst_dev_check_set_local_UA(struct scst_device *dev, struct scst_cmd *exclude, const uint8_t *sense, int sense_len) { struct scst_tgt_dev *tgt_dev, *exclude_tgt_dev = NULL; TRACE_ENTRY(); if (exclude != NULL) exclude_tgt_dev = exclude->tgt_dev; list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { if (tgt_dev != exclude_tgt_dev) scst_check_set_UA(tgt_dev, sense, sense_len, 0); } TRACE_EXIT(); return; } /* * Called under dev_lock and BH off. Returns true if scst_unblock_aborted_cmds() * should be called outside of the dev_lock. */ static bool __scst_dev_check_set_UA(struct scst_device *dev, struct scst_cmd *exclude, const uint8_t *sense, int sense_len) { bool res = false; TRACE_ENTRY(); TRACE_MGMT_DBG("Processing UA dev %s", dev->virt_name); /* Check for reset UA */ if (scst_analyze_sense(sense, sense_len, SCST_SENSE_ASC_VALID, 0, SCST_SENSE_ASC_UA_RESET, 0)) { scst_process_reset(dev, (exclude != NULL) ? exclude->sess : NULL, exclude, NULL, false); res = true; } scst_dev_check_set_local_UA(dev, exclude, sense, sense_len); TRACE_EXIT_RES(res); return res; } void scst_dev_check_set_UA(struct scst_device *dev, struct scst_cmd *exclude, const uint8_t *sense, int sense_len) { struct scst_lksb lksb; bool rc; scst_res_lock(dev, &lksb); rc = __scst_dev_check_set_UA(dev, exclude, sense, sense_len); scst_res_unlock(dev, &lksb); if (rc) scst_unblock_aborted_cmds(NULL, NULL, dev, false); return; } void scst_set_tp_soft_threshold_reached_UA(struct scst_tgt_dev *tgt_dev) { uint8_t sense[SCST_STANDARD_SENSE_LEN]; int len; TRACE_ENTRY(); len = scst_set_sense(sense, sizeof(sense), tgt_dev->dev->d_sense, SCST_LOAD_SENSE(scst_sense_tp_soft_threshold_reached)); scst_check_set_UA(tgt_dev, sense, len, 0); TRACE_EXIT(); return; } EXPORT_SYMBOL_GPL(scst_set_tp_soft_threshold_reached_UA); /* Called under tgt_dev_lock or when tgt_dev is unused */ static void scst_free_all_UA(struct scst_tgt_dev *tgt_dev) { struct scst_tgt_dev_UA *UA_entry, *t; TRACE_ENTRY(); list_for_each_entry_safe(UA_entry, t, &tgt_dev->UA_list, UA_list_entry) { TRACE_MGMT_DBG("Clearing UA for tgt_dev LUN %lld", (unsigned long long int)tgt_dev->lun); list_del(&UA_entry->UA_list_entry); mempool_free(UA_entry, scst_ua_mempool); } INIT_LIST_HEAD(&tgt_dev->UA_list); clear_bit(SCST_TGT_DEV_UA_PENDING, &tgt_dev->tgt_dev_flags); TRACE_EXIT(); return; } /* * sn_lock supposed to be locked and IRQs off. Might drop then reacquire * it inside. */ struct scst_cmd *__scst_check_deferred_commands_locked( struct scst_order_data *order_data, bool return_first) __releases(&order_data->sn_lock) __acquires(&order_data->sn_lock) { struct scst_cmd *res = NULL, *cmd, *t; typeof(order_data->expected_sn) expected_sn = order_data->expected_sn; bool activate = !return_first, first = true, found = false; TRACE_ENTRY(); if (unlikely(order_data->hq_cmd_count != 0)) goto out; restart: list_for_each_entry_safe(cmd, t, &order_data->deferred_cmd_list, deferred_cmd_list_entry) { EXTRACHECKS_BUG_ON(cmd->queue_type == SCST_CMD_QUEUE_ACA); if (unlikely(order_data->aca_tgt_dev != 0)) { if (!test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags)) { /* To prevent defer/release storms during ACA */ continue; } } if (unlikely(cmd->done)) { TRACE_MGMT_DBG("Releasing deferred done cmd %p", cmd); order_data->def_cmd_count--; list_del(&cmd->deferred_cmd_list_entry); spin_lock(&cmd->cmd_threads->cmd_list_lock); TRACE_DBG("Adding cmd %p to active cmd list", cmd); list_add_tail(&cmd->cmd_list_entry, &cmd->cmd_threads->active_cmd_list); wake_up(&cmd->cmd_threads->cmd_list_waitQ); spin_unlock(&cmd->cmd_threads->cmd_list_lock); } else if ((cmd->sn == expected_sn) || !cmd->sn_set) { bool stop = (cmd->sn_slot == NULL); TRACE_SN("Deferred command %p (sn %d, set %d) found", cmd, cmd->sn, cmd->sn_set); order_data->def_cmd_count--; list_del(&cmd->deferred_cmd_list_entry); if (activate) { spin_lock(&cmd->cmd_threads->cmd_list_lock); TRACE_SN("Adding cmd %p to active cmd list", cmd); list_add_tail(&cmd->cmd_list_entry, &cmd->cmd_threads->active_cmd_list); wake_up(&cmd->cmd_threads->cmd_list_waitQ); spin_unlock(&cmd->cmd_threads->cmd_list_lock); /* !! At this point cmd can be already dead !! */ } if (first) { if (!activate) res = cmd; if (stop) { /* * Then there can be only one command * with this SN, so there's no point * to iterate further. */ goto out; } first = false; activate = true; } found = true; } } if (found) goto out; list_for_each_entry(cmd, &order_data->skipped_sn_list, deferred_cmd_list_entry) { EXTRACHECKS_BUG_ON(cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE); if (cmd->sn == expected_sn) { /* * !! At this point any pointer in cmd, except !! * !! cur_order_data, sn_slot and !! * !! deferred_cmd_list_entry, could be already !! * !! destroyed! !! */ TRACE_SN("cmd %p (tag %llu) with skipped sn %d found", cmd, (unsigned long long int)cmd->tag, cmd->sn); order_data->def_cmd_count--; list_del(&cmd->deferred_cmd_list_entry); spin_unlock_irq(&order_data->sn_lock); scst_inc_expected_sn(cmd); if (test_and_set_bit(SCST_CMD_CAN_BE_DESTROYED, &cmd->cmd_flags)) scst_destroy_cmd(cmd); expected_sn = order_data->expected_sn; spin_lock_irq(&order_data->sn_lock); goto restart; } } out: TRACE_EXIT_HRES((unsigned long)res); return res; } /* No locks */ struct scst_cmd *__scst_check_deferred_commands( struct scst_order_data *order_data, bool return_first) { struct scst_cmd *res; TRACE_ENTRY(); spin_lock_irq(&order_data->sn_lock); res = __scst_check_deferred_commands_locked(order_data, return_first); spin_unlock_irq(&order_data->sn_lock); TRACE_EXIT_HRES((unsigned long)res); return res; } void scst_unblock_deferred(struct scst_order_data *order_data, struct scst_cmd *out_of_sn_cmd) { TRACE_ENTRY(); if (!out_of_sn_cmd->sn_set) { TRACE_SN("cmd %p without sn", out_of_sn_cmd); goto out; } if (out_of_sn_cmd->sn == order_data->expected_sn) { TRACE_SN("out of sn cmd %p (expected sn %d)", out_of_sn_cmd, order_data->expected_sn); scst_inc_expected_sn(out_of_sn_cmd); } else { out_of_sn_cmd->out_of_sn = 1; spin_lock_irq(&order_data->sn_lock); order_data->def_cmd_count++; list_add_tail(&out_of_sn_cmd->deferred_cmd_list_entry, &order_data->skipped_sn_list); TRACE_SN("out_of_sn_cmd %p with sn %d added to skipped_sn_list" " (expected_sn %d)", out_of_sn_cmd, out_of_sn_cmd->sn, order_data->expected_sn); spin_unlock_irq(&order_data->sn_lock); /* * expected_sn could change while we there, so we need to * recheck deferred commands on this path as well */ } scst_make_deferred_commands_active(order_data); out: TRACE_EXIT(); return; } /* dev_lock supposed to be held and BH disabled */ void scst_block_dev(struct scst_device *dev) { dev->block_count++; TRACE_BLOCK("Device BLOCK (new count %d), dev %s", dev->block_count, dev->virt_name); } /* * dev_lock supposed to be held and BH disabled. Returns true if cmd blocked, * hence stop processing it and go to the next command. */ bool __scst_check_blocked_dev(struct scst_cmd *cmd) { int res = false; struct scst_device *dev = cmd->dev; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(cmd->unblock_dev); EXTRACHECKS_BUG_ON(cmd->internal && cmd->cdb[0] != EXTENDED_COPY); if (unlikely(test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags))) goto out; if (dev->block_count > 0) { TRACE_BLOCK("Delaying cmd %p due to blocking " "(tag %llu, op %s, dev %s)", cmd, (unsigned long long int)cmd->tag, scst_get_opcode_name(cmd), dev->virt_name); goto out_block; } else if ((cmd->op_flags & SCST_STRICTLY_SERIALIZED) == SCST_STRICTLY_SERIALIZED) { TRACE_BLOCK("Strictly serialized cmd %p (tag %llu, op %s, dev %s)", cmd, (unsigned long long int)cmd->tag, scst_get_opcode_name(cmd), dev->virt_name); if ((cmd->cdb[0] == MAINTENANCE_OUT) && ((cmd->cdb[1] & 0x1f) == MO_SET_TARGET_PGS)) { const struct scst_cmd *c; /* * It's OK to do that without lock, because we * are interested only in comparison */ c = list_first_entry(&scst_global_stpg_list, typeof(*c), global_stpg_list_entry); if (cmd != c) { TRACE_BLOCK("Blocking serialized STPG cmd %p " "(head %p)", cmd, c); cmd->cmd_global_stpg_blocked = 1; goto out_block; } } scst_block_dev(dev); if (dev->on_dev_cmd_count > 1) { TRACE_BLOCK("Delaying strictly serialized cmd %p " "(dev %s, on_dev_cmds to wait %d)", cmd, dev->virt_name, dev->on_dev_cmd_count-1); EXTRACHECKS_BUG_ON(dev->strictly_serialized_cmd_waiting); dev->strictly_serialized_cmd_waiting = 1; goto out_block; } else cmd->unblock_dev = 1; } else if ((dev->dev_double_ua_possible) || ((cmd->op_flags & SCST_SERIALIZED) != 0)) { TRACE_BLOCK("cmd %p (tag %llu, op %s): blocking further cmds " "on dev %s due to %s", cmd, (unsigned long long int)cmd->tag, scst_get_opcode_name(cmd), dev->virt_name, dev->dev_double_ua_possible ? "possible double reset UA" : "serialized cmd"); scst_block_dev(dev); cmd->unblock_dev = 1; } else TRACE_BLOCK("No blocks for device %s", dev->virt_name); out: TRACE_EXIT_RES(res); return res; out_block: if (cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE) list_add(&cmd->blocked_cmd_list_entry, &dev->blocked_cmd_list); else list_add_tail(&cmd->blocked_cmd_list_entry, &dev->blocked_cmd_list); res = true; goto out; } /* dev_lock supposed to be held and BH disabled */ void scst_unblock_dev(struct scst_device *dev) { TRACE_ENTRY(); TRACE_BLOCK("Device UNBLOCK (new %d), dev %s", dev->block_count-1, dev->virt_name); if (--dev->block_count == 0) { struct scst_cmd *cmd, *tcmd; unsigned long flags; local_irq_save_nort(flags); list_for_each_entry_safe(cmd, tcmd, &dev->blocked_cmd_list, blocked_cmd_list_entry) { bool strictly_serialized = ((cmd->op_flags & SCST_STRICTLY_SERIALIZED) == SCST_STRICTLY_SERIALIZED); if (dev->strictly_serialized_cmd_waiting && !strictly_serialized) continue; list_del(&cmd->blocked_cmd_list_entry); cmd->cmd_global_stpg_blocked = 0; TRACE_BLOCK("Adding blocked cmd %p to active cmd list", cmd); spin_lock(&cmd->cmd_threads->cmd_list_lock); if (cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE) list_add(&cmd->cmd_list_entry, &cmd->cmd_threads->active_cmd_list); else list_add_tail(&cmd->cmd_list_entry, &cmd->cmd_threads->active_cmd_list); wake_up(&cmd->cmd_threads->cmd_list_waitQ); spin_unlock(&cmd->cmd_threads->cmd_list_lock); if (dev->strictly_serialized_cmd_waiting && strictly_serialized) break; } local_irq_restore_nort(flags); } sBUG_ON(dev->block_count < 0); TRACE_EXIT(); return; } /** * scst_obtain_device_parameters() - obtain device control parameters * @dev: device to act on * @mode_select_cdb: original MODE SELECT CDB * * Issues a MODE SENSE for necessary pages data and sets the corresponding * dev's parameter from it. Parameter mode_select_cdb is pointer on original * MODE SELECT CDB, if this function called to refresh parameters after * successfully finished MODE SELECT command detected. * * Returns 0 on success and not 0 otherwise. */ int scst_obtain_device_parameters(struct scst_device *dev, const uint8_t *mode_select_cdb) { int rc, i; uint8_t cmd[16]; uint8_t buffer[4+0x0A]; uint8_t sense_buffer[SCSI_SENSE_BUFFERSIZE]; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(dev->scsi_dev == NULL); if (mode_select_cdb != NULL) { if ((mode_select_cdb[2] & 0x3F) != 0x0A) { TRACE_DBG("Not control mode page (%x) change requested, " "skipping", mode_select_cdb[2] & 0x3F); goto out; } } for (i = 0; i < 5; i++) { /* Get control mode page */ memset(cmd, 0, sizeof(cmd)); #if 0 cmd[0] = MODE_SENSE_10; cmd[1] = 0; cmd[2] = 0x0A; cmd[8] = sizeof(buffer); /* it's < 256 */ #else cmd[0] = MODE_SENSE; cmd[1] = 8; /* DBD */ cmd[2] = 0x0A; cmd[4] = sizeof(buffer); #endif memset(buffer, 0, sizeof(buffer)); memset(sense_buffer, 0, sizeof(sense_buffer)); TRACE(TRACE_SCSI, "%s", "Doing internal MODE_SENSE"); rc = scst_scsi_execute(dev->scsi_dev, cmd, SCST_DATA_READ, buffer, sizeof(buffer), sense_buffer, 15, 0, 0); TRACE_DBG("MODE_SENSE done: %x", rc); if (scsi_status_is_good(rc)) { int q; PRINT_BUFF_FLAG(TRACE_SCSI, "Returned control mode " "page data", buffer, sizeof(buffer)); dev->tst = buffer[4+2] >> 5; dev->tmf_only = (buffer[4+2] & 0x10) >> 4; dev->dpicz = (buffer[4+2] & 0x8) >> 3; q = buffer[4+3] >> 4; if (q > SCST_QUEUE_ALG_1_UNRESTRICTED_REORDER) { PRINT_ERROR("Too big QUEUE ALG %x, dev %s, " "using default: unrestricted reorder", dev->queue_alg, dev->virt_name); q = SCST_QUEUE_ALG_1_UNRESTRICTED_REORDER; } dev->queue_alg = q; dev->qerr = (buffer[4+3] & 0x6) >> 1; dev->swp = (buffer[4+4] & 0x8) >> 3; dev->tas = (buffer[4+5] & 0x40) >> 6; dev->d_sense = (buffer[4+2] & 0x4) >> 2; /* * Unfortunately, SCSI ML doesn't provide a way to * specify commands task attribute, so we can rely on * device's restricted reordering only. Linux I/O * subsystem doesn't reorder pass-through (PC) requests. */ dev->has_own_order_mgmt = !dev->queue_alg; PRINT_INFO("Device %s: TST %x, TMF_ONLY %x, QUEUE ALG %x, " "QErr %x, SWP %x, TAS %x, D_SENSE %d, DPICZ %d, " "has_own_order_mgmt %d", dev->virt_name, dev->tst, dev->tmf_only, dev->queue_alg, dev->qerr, dev->swp, dev->tas, dev->d_sense, dev->dpicz, dev->has_own_order_mgmt); goto out; } else { scst_check_internal_sense(dev, rc, sense_buffer, sizeof(sense_buffer)); #if 0 if ((status_byte(rc) == CHECK_CONDITION) && scst_sense_valid(sense_buffer)) { #else /* * 3ware controller is buggy and returns CONDITION_GOOD * instead of CHECK_CONDITION */ if (scst_sense_valid(sense_buffer)) { #endif PRINT_BUFF_FLAG(TRACE_SCSI, "MODE SENSE returned " "sense", sense_buffer, sizeof(sense_buffer)); if (scst_analyze_sense(sense_buffer, sizeof(sense_buffer), SCST_SENSE_KEY_VALID, ILLEGAL_REQUEST, 0, 0)) { PRINT_INFO("Device %s doesn't support " "MODE SENSE or control mode page", dev->virt_name); break; } else if (scst_analyze_sense(sense_buffer, sizeof(sense_buffer), SCST_SENSE_KEY_VALID, NOT_READY, 0, 0)) { PRINT_ERROR("Device %s not ready", dev->virt_name); break; } } else { PRINT_INFO("Internal MODE SENSE to " "device %s failed: %x", dev->virt_name, rc); switch (host_byte(rc)) { case DID_RESET: case DID_ABORT: case DID_SOFT_ERROR: break; default: goto brk; } switch (driver_byte(rc)) { case DRIVER_BUSY: case DRIVER_SOFT: break; default: goto brk; } } } } brk: PRINT_WARNING("Unable to get device's %s control mode page, using " "existing values/defaults: TST %x, TMF_ONLY %x, QUEUE ALG %x, " "QErr %x, SWP %x, TAS %x, D_SENSE %d, DPICZ %d, " "has_own_order_mgmt %d", dev->virt_name, dev->tst, dev->tmf_only, dev->queue_alg, dev->qerr, dev->swp, dev->tas, dev->d_sense, dev->dpicz, dev->has_own_order_mgmt); out: TRACE_EXIT(); return 0; } EXPORT_SYMBOL_GPL(scst_obtain_device_parameters); void scst_on_hq_cmd_response(struct scst_cmd *cmd) { struct scst_order_data *order_data = cmd->cur_order_data; TRACE_ENTRY(); if (!cmd->hq_cmd_inced) goto out; spin_lock_irq(&order_data->sn_lock); order_data->hq_cmd_count--; spin_unlock_irq(&order_data->sn_lock); EXTRACHECKS_BUG_ON(order_data->hq_cmd_count < 0); /* * There is no problem in checking hq_cmd_count in the * non-locked state. In the worst case we will only have * unneeded run of the deferred commands. */ if (order_data->hq_cmd_count == 0) scst_make_deferred_commands_active(order_data); out: TRACE_EXIT(); return; } void scst_store_sense(struct scst_cmd *cmd) { TRACE_ENTRY(); if (scst_sense_valid(cmd->sense) && !test_bit(SCST_CMD_NO_RESP, &cmd->cmd_flags) && (cmd->tgt_dev != NULL)) { struct scst_tgt_dev *tgt_dev = cmd->tgt_dev; TRACE_DBG("Storing sense (cmd %p)", cmd); spin_lock_bh(&tgt_dev->tgt_dev_lock); if (cmd->sense_valid_len <= sizeof(tgt_dev->tgt_dev_sense)) tgt_dev->tgt_dev_valid_sense_len = cmd->sense_valid_len; else { tgt_dev->tgt_dev_valid_sense_len = sizeof(tgt_dev->tgt_dev_sense); PRINT_ERROR("Stored sense truncated to size %d " "(needed %d)", tgt_dev->tgt_dev_valid_sense_len, cmd->sense_valid_len); } memcpy(tgt_dev->tgt_dev_sense, cmd->sense, tgt_dev->tgt_dev_valid_sense_len); spin_unlock_bh(&tgt_dev->tgt_dev_lock); } TRACE_EXIT(); return; } /* dev_lock supposed to be locked and BHs off */ static void scst_abort_cmds_tgt_dev(struct scst_tgt_dev *tgt_dev, struct scst_cmd *exclude_cmd) { struct scst_session *sess = tgt_dev->sess; struct scst_cmd *cmd; TRACE_ENTRY(); TRACE_MGMT_DBG("QErr: aborting commands for tgt_dev %p " "(exclude_cmd %p), if there are any", tgt_dev, exclude_cmd); spin_lock_irq(&sess->sess_list_lock); list_for_each_entry(cmd, &sess->sess_cmd_list, sess_cmd_list_entry) { if (cmd == exclude_cmd) continue; if ((cmd->tgt_dev == tgt_dev) || ((cmd->tgt_dev == NULL) && (cmd->lun == tgt_dev->lun))) { scst_abort_cmd(cmd, NULL, (tgt_dev != exclude_cmd->tgt_dev), 0); } } spin_unlock_irq(&sess->sess_list_lock); TRACE_EXIT(); return; } /* dev_lock supposed to be locked and BHs off */ static void scst_abort_cmds_dev(struct scst_device *dev, struct scst_cmd *exclude_cmd) { struct scst_tgt_dev *tgt_dev; uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN]; int sl = 0; bool set_ua = (dev->tas == 0); TRACE_ENTRY(); TRACE_MGMT_DBG("QErr: Aborting commands for dev %p (exclude_cmd %p, " "set_ua %d), if there are any", dev, exclude_cmd, set_ua); if (set_ua) sl = scst_set_sense(sense_buffer, sizeof(sense_buffer), dev->d_sense, SCST_LOAD_SENSE(scst_sense_cleared_by_another_ini_UA)); list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { scst_abort_cmds_tgt_dev(tgt_dev, exclude_cmd); /* * Potentially, setting UA here, when the aborted commands are * still running, can lead to a situation that one of them could * take it, then that would be detected and the UA requeued. * But, meanwhile, one or more subsequent, i.e. not aborted, * commands can "leak" executed normally. So, as result, the * UA would be delivered one or more commands "later". However, * that should be OK, because, if multiple commands are being * executed in parallel, you can't control exact order of UA * delivery anyway. */ if (set_ua && (tgt_dev != exclude_cmd->tgt_dev)) scst_check_set_UA(tgt_dev, sense_buffer, sl, 0); } TRACE_EXIT(); return; } /* No locks */ static void scst_process_qerr(struct scst_cmd *cmd) { bool unblock = false; struct scst_device *dev = cmd->dev; unsigned int qerr, q; TRACE_ENTRY(); /* dev->qerr can be changed behind our back */ q = dev->qerr; qerr = READ_ONCE(q); /* READ_ONCE() doesn't work for bit fields */ TRACE_DBG("Processing QErr %d for cmd %p", qerr, cmd); spin_lock_bh(&dev->dev_lock); switch (qerr) { case SCST_QERR_2_RESERVED: default: PRINT_WARNING("Invalid QErr value %x for device %s, process as " "0", qerr, dev->virt_name); /* fall through */ case SCST_QERR_0_ALL_RESUME: /* Nothing to do */ break; case SCST_QERR_1_ABORT_ALL: if (dev->tst == SCST_TST_0_SINGLE_TASK_SET) scst_abort_cmds_dev(dev, cmd); else scst_abort_cmds_tgt_dev(cmd->tgt_dev, cmd); unblock = true; break; case SCST_QERR_3_ABORT_THIS_NEXUS_ONLY: scst_abort_cmds_tgt_dev(cmd->tgt_dev, cmd); unblock = true; break; } spin_unlock_bh(&dev->dev_lock); if (unblock) scst_unblock_aborted_cmds(cmd->tgt, cmd->sess, dev, false); TRACE_EXIT(); return; } /* * No locks. Returns -1, if processing should be switched to another cmd, 1 * if cmd was aborted, 0 if cmd processing should continue. */ int scst_process_check_condition(struct scst_cmd *cmd) { int res; struct scst_order_data *order_data; struct scst_device *dev; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(test_bit(SCST_CMD_NO_RESP, &cmd->cmd_flags)); order_data = cmd->cur_order_data; dev = cmd->dev; TRACE((order_data->aca_tgt_dev != 0) ? TRACE_MGMT_DEBUG : TRACE_DEBUG, "CHECK CONDITION for cmd %p (naca %d, cmd_aca_allowed %d, " "ACA allowed cmd %d, tgt_dev %p, aca_tgt_dev %lu, aca_cmd %p)", cmd, cmd->cmd_naca, cmd->cmd_aca_allowed, cmd->queue_type == SCST_CMD_QUEUE_ACA, cmd->tgt_dev, order_data->aca_tgt_dev, order_data->aca_cmd); spin_lock_irq(&order_data->sn_lock); if (order_data->aca_tgt_dev != 0) { if (((cmd->queue_type == SCST_CMD_QUEUE_ACA) && (order_data->aca_tgt_dev == (unsigned long)cmd->tgt_dev)) || ((cmd->cdb[0] == PERSISTENT_RESERVE_OUT) && ((cmd->cdb[1] & 0x1f) == PR_PREEMPT_AND_ABORT))) { if (!cmd->cmd_naca) { if (order_data->aca_cmd == cmd) { /* * Clear it to prevent from be * aborted during ACA clearing */ TRACE_MGMT_DBG("Check condition of ACA " "cmd %p", cmd); order_data->aca_cmd = NULL; } spin_unlock_irq(&order_data->sn_lock); scst_clear_aca(cmd->tgt_dev, (order_data->aca_tgt_dev != (unsigned long)cmd->tgt_dev)); /* * Goto directly to avoid race when ACA * reestablished during retaking sn_lock * once again. */ goto process_qerr; } } if (test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags)) { /* * cmd can be aborted and the unblock * procedure finished while we were * entering here. I.e. cmd can not be * blocked anymore for any case. */ res = 1; goto out_unlock; } else if (!cmd->cmd_aca_allowed) { TRACE_MGMT_DBG("Deferring CHECK CONDITION " "cmd %p due to ACA active (tgt_dev %p)", cmd, cmd->tgt_dev); order_data->def_cmd_count++; /* * Put cmd in the head to let restart earlier: * it is already completed and completed with * CHECK CONDITION */ list_add(&cmd->deferred_cmd_list_entry, &order_data->deferred_cmd_list); res = -1; goto out_unlock; } } if (cmd->cmd_naca) { TRACE_MGMT_DBG("Establishing ACA for dev %s (lun %lld, cmd %p, " "tgt_dev %p)", dev->virt_name, (unsigned long long)cmd->lun, cmd, cmd->tgt_dev); order_data->aca_tgt_dev = (unsigned long)cmd->tgt_dev; } spin_unlock_irq(&order_data->sn_lock); process_qerr: scst_process_qerr(cmd); scst_store_sense(cmd); res = 0; out: TRACE_EXIT_RES(res); return res; out_unlock: spin_unlock_irq(&order_data->sn_lock); goto out; } void scst_xmit_process_aborted_cmd(struct scst_cmd *cmd) { TRACE_ENTRY(); TRACE_MGMT_DBG("Aborted cmd %p done (cmd_ref %d)", cmd, atomic_read(&cmd->cmd_ref)); scst_done_cmd_mgmt(cmd); if (test_bit(SCST_CMD_ABORTED_OTHER, &cmd->cmd_flags)) { if (cmd->completed) { /* It's completed and it's OK to return its result */ goto out; } /* For not yet inited commands cmd->dev can be NULL here */ if (test_bit(SCST_CMD_DEVICE_TAS, &cmd->cmd_flags)) { TRACE_MGMT_DBG("Flag ABORTED OTHER set for cmd %p " "(tag %llu), returning TASK ABORTED ", cmd, (unsigned long long int)cmd->tag); scst_set_cmd_error_status(cmd, SAM_STAT_TASK_ABORTED); } else { TRACE_MGMT_DBG("Flag ABORTED OTHER set for cmd %p " "(tag %llu), aborting without delivery or " "notification", cmd, (unsigned long long int)cmd->tag); /* * There is no need to check/requeue possible UA, * because, if it exists, it will be delivered * by the "completed" branch above. */ clear_bit(SCST_CMD_ABORTED_OTHER, &cmd->cmd_flags); } } out: TRACE_EXIT(); return; } /** * scst_get_max_lun_commands() - return maximum supported commands count * * Returns maximum commands count which can be queued to this LUN in this * session. * * If lun is NO_SUCH_LUN, returns minimum of maximum commands count which * can be queued to any LUN in this session. * * If sess is NULL, returns minimum of maximum commands count which can be * queued to any SCST device. */ int scst_get_max_lun_commands(struct scst_session *sess, uint64_t lun) { const int init_res = 0xFFFFFF; int res = init_res, i; TRACE_ENTRY(); mutex_lock(&scst_mutex); if (sess == NULL) { struct scst_device *dev; list_for_each_entry(dev, &scst_dev_list, dev_list_entry) { if (dev->handler == &scst_null_devtype) continue; TRACE_DBG("dev %s, max_tgt_dev_commands %d (res %d)", dev->virt_name, dev->max_tgt_dev_commands, res); if (res > dev->max_tgt_dev_commands) res = dev->max_tgt_dev_commands; } goto out_unlock; } if (lun != NO_SUCH_LUN) { struct list_head *head = &sess->sess_tgt_dev_list[SESS_TGT_DEV_LIST_HASH_FN(lun)]; struct scst_tgt_dev *tgt_dev; list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) { if (tgt_dev->lun == lun) { res = tgt_dev->dev->max_tgt_dev_commands; TRACE_DBG("tgt_dev %p, dev %s, max_tgt_dev_commands " "%d (res %d)", tgt_dev, tgt_dev->dev->virt_name, tgt_dev->dev->max_tgt_dev_commands, res); break; } } goto out_unlock; } for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) { struct list_head *head = &sess->sess_tgt_dev_list[i]; struct scst_tgt_dev *tgt_dev; list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) { if (res > tgt_dev->dev->max_tgt_dev_commands) res = tgt_dev->dev->max_tgt_dev_commands; } } out_unlock: mutex_unlock(&scst_mutex); TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL(scst_get_max_lun_commands); /** * scst_reassign_retained_sess_states() - reassigns retained states * * Reassigns retained during nexus loss states from old_sess to new_sess. */ void scst_reassign_retained_sess_states(struct scst_session *new_sess, struct scst_session *old_sess) { struct scst_device *dev; TRACE_ENTRY(); TRACE_MGMT_DBG("Reassigning retained states from old_sess %p to " "new_sess %p", old_sess, new_sess); if ((new_sess == NULL) || (old_sess == NULL)) { TRACE_DBG("%s", "new_sess or old_sess is NULL"); goto out; } if (new_sess == old_sess) { TRACE_DBG("%s", "new_sess or old_sess are the same"); goto out; } if ((new_sess->transport_id == NULL) || (old_sess->transport_id == NULL)) { TRACE_DBG("%s", "new_sess or old_sess doesn't support PRs"); goto out; } mutex_lock(&scst_mutex); list_for_each_entry(dev, &scst_dev_list, dev_list_entry) { struct scst_tgt_dev *tgt_dev; struct scst_tgt_dev *new_tgt_dev = NULL, *old_tgt_dev = NULL; struct scst_lksb pr_lksb; TRACE_DBG("Processing dev %s", dev->virt_name); list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) { if (tgt_dev->sess == new_sess) { new_tgt_dev = tgt_dev; if (old_tgt_dev != NULL) break; } if (tgt_dev->sess == old_sess) { old_tgt_dev = tgt_dev; if (new_tgt_dev != NULL) break; } } if ((new_tgt_dev == NULL) || (old_tgt_dev == NULL)) { TRACE_DBG("new_tgt_dev %p or old_sess %p is NULL, " "skipping (dev %s)", new_tgt_dev, old_tgt_dev, dev->virt_name); continue; } /** Reassign regular reservations **/ scst_res_lock(dev, &pr_lksb); if (scst_is_reservation_holder(dev, old_sess)) { scst_reserve_dev(dev, new_sess); TRACE_DBG("Reservation reassigned from old_tgt_dev %p " "to new_tgt_dev %p", old_tgt_dev, new_tgt_dev); } scst_res_unlock(dev, &pr_lksb); /** Reassign PRs **/ if ((new_sess->transport_id == NULL) || (old_sess->transport_id == NULL)) { TRACE_DBG("%s", "new_sess or old_sess doesn't support PRs"); goto next; } scst_pr_write_lock(dev); if (old_tgt_dev->registrant != NULL) { TRACE_PR("Reassigning reg %p from tgt_dev %p to %p", old_tgt_dev->registrant, old_tgt_dev, new_tgt_dev); if (new_tgt_dev->registrant != NULL) new_tgt_dev->registrant->tgt_dev = NULL; new_tgt_dev->registrant = old_tgt_dev->registrant; new_tgt_dev->registrant->tgt_dev = new_tgt_dev; old_tgt_dev->registrant = NULL; } scst_pr_write_unlock(dev); next: /** Reassign other DH specific states **/ if (dev->handler->reassign_retained_states != NULL) { TRACE_DBG("Calling dev's %s reassign_retained_states(%p, %p)", dev->virt_name, new_tgt_dev, old_tgt_dev); dev->handler->reassign_retained_states(new_tgt_dev, old_tgt_dev); TRACE_DBG("Dev's %s reassign_retained_states() returned", dev->virt_name); } } mutex_unlock(&scst_mutex); out: TRACE_EXIT(); return; } EXPORT_SYMBOL(scst_reassign_retained_sess_states); /** * scst_get_next_lexem() - parse and return next lexem in the string * * Returns pointer to the next lexem from token_str skipping * spaces and '=' character and using them then as a delimeter. Content * of token_str is modified by setting '\0' at the delimeter's position. */ char *scst_get_next_lexem(char **token_str) { char *p, *q; static char blank = '\0'; if ((token_str == NULL) || (*token_str == NULL)) return ␣ for (p = *token_str; (*p != '\0') && (isspace(*p) || (*p == '=')); p++) ; for (q = p; (*q != '\0') && !isspace(*q) && (*q != '='); q++) ; if (*q != '\0') *q++ = '\0'; *token_str = q; return p; } EXPORT_SYMBOL_GPL(scst_get_next_lexem); /** * scst_restore_token_str() - restore string modified by scst_get_next_lexem() * * Restores token_str modified by scst_get_next_lexem() to the * previous value before scst_get_next_lexem() was called. Prev_lexem is * a pointer to lexem returned by scst_get_next_lexem(). */ void scst_restore_token_str(char *prev_lexem, char *token_str) { if (&prev_lexem[strlen(prev_lexem)] != token_str) prev_lexem[strlen(prev_lexem)] = ' '; return; } EXPORT_SYMBOL_GPL(scst_restore_token_str); /** * scst_get_next_token_str() - parse and return next token * * This function returns pointer to the next token strings from input_str * using '\n', ';' and '\0' as a delimeter. Content of input_str is * modified by setting '\0' at the delimeter's position. */ char *scst_get_next_token_str(char **input_str) { char *p = *input_str; int i = 0; while ((p[i] != '\n') && (p[i] != ';') && (p[i] != '\0')) i++; if (i == 0) return NULL; if (p[i] == '\0') *input_str = &p[i]; else *input_str = &p[i+1]; p[i] = '\0'; return p; } EXPORT_SYMBOL_GPL(scst_get_next_token_str); static int scst_parse_unmap_descriptors(struct scst_cmd *cmd) { int res = 0; ssize_t length = 0; uint8_t *address; int i, cnt, offset, descriptor_len, total_len; struct scst_data_descriptor *pd; TRACE_ENTRY(); EXTRACHECKS_BUG_ON(cmd->cmd_data_descriptors != NULL); EXTRACHECKS_BUG_ON(cmd->cmd_data_descriptors_cnt != 0); length = scst_get_buf_full_sense(cmd, &address); if (unlikely(length <= 0)) { if (length == 0) goto out; else goto out_abn; } total_len = get_unaligned_be16(&cmd->cdb[7]); offset = 8; descriptor_len = get_unaligned_be16(&address[2]); TRACE_DBG("total_len %d, descriptor_len %d", total_len, descriptor_len); if (descriptor_len == 0) goto out_put; if (unlikely((descriptor_len > (total_len - 8)) || ((descriptor_len % 16) != 0))) { PRINT_ERROR("Bad descriptor length: %d < %d - 8", descriptor_len, total_len); scst_set_invalid_field_in_parm_list(cmd, 2, 0); goto out_abn_put; } cnt = descriptor_len/16; if (cnt == 0) goto out_put; pd = kcalloc(cnt, sizeof(*pd), GFP_KERNEL); if (pd == NULL) { PRINT_ERROR("Unable to kmalloc UNMAP %d descriptors", cnt+1); scst_set_busy(cmd); goto out_abn_put; } TRACE_DBG("cnt %d, pd %p", cnt, pd); i = 0; while ((offset - 8) < descriptor_len) { struct scst_data_descriptor *d = &pd[i]; d->sdd_lba = get_unaligned_be64(&address[offset]); offset += 8; d->sdd_blocks = get_unaligned_be32(&address[offset]); offset += 8; TRACE_DBG("i %d, lba %lld, blocks %lld", i, (long long)d->sdd_lba, (long long)d->sdd_blocks); i++; } cmd->cmd_data_descriptors = pd; cmd->cmd_data_descriptors_cnt = cnt; out_put: scst_put_buf_full(cmd, address); out: TRACE_EXIT_RES(res); return res; out_abn_put: scst_put_buf_full(cmd, address); out_abn: scst_set_cmd_abnormal_done_state(cmd); res = -1; goto out; } static void scst_free_unmap_descriptors(struct scst_cmd *cmd) { TRACE_ENTRY(); kfree(cmd->cmd_data_descriptors); cmd->cmd_data_descriptors = NULL; TRACE_EXIT(); return; } int scst_parse_descriptors(struct scst_cmd *cmd) { int res; TRACE_ENTRY(); switch (cmd->cdb[0]) { case UNMAP: res = scst_parse_unmap_descriptors(cmd); break; case EXTENDED_COPY: res = scst_cm_parse_descriptors(cmd); break; default: sBUG(); } TRACE_EXIT_RES(res); return res; } static void scst_free_descriptors(struct scst_cmd *cmd) { TRACE_ENTRY(); switch (cmd->cdb[0]) { case UNMAP: scst_free_unmap_descriptors(cmd); break; case EXTENDED_COPY: scst_cm_free_descriptors(cmd); break; default: sBUG(); break; } TRACE_EXIT(); return; } /** ** We currently have only few saved parameters and it is impossible to get ** pointer on a bit field, so let's have a simple straightforward ** implementation. **/ #define SCST_TAS_LABEL "TAS" #define SCST_QERR_LABEL "QERR" #define SCST_TMF_ONLY_LABEL "TMF_ONLY" #define SCST_SWP_LABEL "SWP" #define SCST_DSENSE_LABEL "D_SENSE" #define SCST_QUEUE_ALG_LABEL "QUEUE_ALG" #define SCST_DPICZ_LABEL "DPICZ" int scst_save_global_mode_pages(const struct scst_device *dev, uint8_t *buf, int size) { int res = 0; TRACE_ENTRY(); if (dev->tas != dev->tas_default) { res += scnprintf(&buf[res], size - res, "%s=%d\n", SCST_TAS_LABEL, dev->tas); if (res >= size-1) goto out_overflow; } if (dev->qerr != dev->qerr_default) { res += scnprintf(&buf[res], size - res, "%s=%d\n", SCST_QERR_LABEL, dev->qerr); if (res >= size-1) goto out_overflow; } if (dev->tmf_only != dev->tmf_only_default) { res += scnprintf(&buf[res], size - res, "%s=%d\n", SCST_TMF_ONLY_LABEL, dev->tmf_only); if (res >= size-1) goto out_overflow; } if (dev->swp != dev->swp_default) { res += scnprintf(&buf[res], size - res, "%s=%d\n", SCST_SWP_LABEL, dev->swp); if (res >= size-1) goto out_overflow; } if (dev->d_sense != dev->d_sense_default) { res += scnprintf(&buf[res], size - res, "%s=%d\n", SCST_DSENSE_LABEL, dev->d_sense); if (res >= size-1) goto out_overflow; } if (dev->dpicz != dev->dpicz_default) { res += scnprintf(&buf[res], size - res, "%s=%d\n", SCST_DPICZ_LABEL, dev->dpicz); if (res >= size-1) goto out_overflow; } if (dev->queue_alg != dev->queue_alg_default) { res += scnprintf(&buf[res], size - res, "%s=%d\n", SCST_QUEUE_ALG_LABEL, dev->queue_alg); if (res >= size-1) goto out_overflow; } out: TRACE_EXIT_RES(res); return res; out_overflow: PRINT_ERROR("Global mode pages buffer overflow (size %d)", size); res = -EOVERFLOW; goto out; } EXPORT_SYMBOL_GPL(scst_save_global_mode_pages); static int scst_restore_tas(struct scst_device *dev, unsigned int val) { int res; TRACE_ENTRY(); if (val > 1) { PRINT_ERROR("Invalid value %d for parameter %s (device %s)", val, SCST_TAS_LABEL, dev->virt_name); res = -EINVAL; goto out; } dev->tas = val; dev->tas_saved = val; PRINT_INFO("%s restored to %d for device %s", SCST_TAS_LABEL, dev->tas, dev->virt_name); res = 0; out: TRACE_EXIT_RES(res); return res; } static int scst_restore_qerr(struct scst_device *dev, unsigned int val) { int res; TRACE_ENTRY(); if ((val == SCST_QERR_2_RESERVED) || (val > SCST_QERR_3_ABORT_THIS_NEXUS_ONLY)) { PRINT_ERROR("Invalid value %d for parameter %s (device %s)", val, SCST_QERR_LABEL, dev->virt_name); res = -EINVAL; goto out; } dev->qerr = val; dev->qerr_saved = val; PRINT_INFO("%s restored to %d for device %s", SCST_QERR_LABEL, dev->qerr, dev->virt_name); res = 0; out: TRACE_EXIT_RES(res); return res; } static int scst_restore_tmf_only(struct scst_device *dev, unsigned int val) { int res; TRACE_ENTRY(); if (val > 1) { PRINT_ERROR("Invalid value %d for parameter %s (device %s)", val, SCST_TMF_ONLY_LABEL, dev->virt_name); res = -EINVAL; goto out; } dev->tmf_only = val; dev->tmf_only_saved = val; PRINT_INFO("%s restored to %d for device %s", SCST_TMF_ONLY_LABEL, dev->tmf_only, dev->virt_name); res = 0; out: TRACE_EXIT_RES(res); return res; } static int scst_restore_swp(struct scst_device *dev, unsigned int val) { int res; TRACE_ENTRY(); if (val > 1) { PRINT_ERROR("Invalid value %d for parameter %s (device %s)", val, SCST_SWP_LABEL, dev->virt_name); res = -EINVAL; goto out; } dev->swp = val; dev->swp_saved = val; PRINT_INFO("%s restored to %d for device %s", SCST_SWP_LABEL, dev->swp, dev->virt_name); res = 0; out: TRACE_EXIT_RES(res); return res; } static int scst_restore_dsense(struct scst_device *dev, unsigned int val) { int res; TRACE_ENTRY(); if (val > 1) { PRINT_ERROR("Invalid value %d for parameter %s (device %s)", val, SCST_DSENSE_LABEL, dev->virt_name); res = -EINVAL; goto out; } dev->d_sense = val; dev->d_sense_saved = val; PRINT_INFO("%s restored to %d for device %s", SCST_DSENSE_LABEL, dev->d_sense, dev->virt_name); res = 0; out: TRACE_EXIT_RES(res); return res; } static int scst_restore_dpicz(struct scst_device *dev, unsigned int val) { int res; TRACE_ENTRY(); if (val > 1) { PRINT_ERROR("Invalid value %d for parameter %s (device %s)", val, SCST_DPICZ_LABEL, dev->virt_name); res = -EINVAL; goto out; } dev->dpicz = val; dev->dpicz_saved = val; PRINT_INFO("%s restored to %d for device %s", SCST_DPICZ_LABEL, dev->dpicz, dev->virt_name); res = 0; out: TRACE_EXIT_RES(res); return res; } static int scst_restore_queue_alg(struct scst_device *dev, unsigned int val) { int res; TRACE_ENTRY(); if ((val != SCST_QUEUE_ALG_0_RESTRICTED_REORDER) && (val != SCST_QUEUE_ALG_1_UNRESTRICTED_REORDER)) { PRINT_ERROR("Invalid value %d for parameter %s (device %s)", val, SCST_QUEUE_ALG_LABEL, dev->virt_name); res = -EINVAL; goto out; } dev->queue_alg = val; dev->queue_alg_saved = val; PRINT_INFO("%s restored to %d for device %s", SCST_QUEUE_ALG_LABEL, dev->queue_alg, dev->virt_name); res = 0; out: TRACE_EXIT_RES(res); return res; } /* Params are NULL-terminated */ int scst_restore_global_mode_pages(struct scst_device *dev, char *params, char **last_param) { int res; char *param, *p, *pp; unsigned long val; TRACE_ENTRY(); while (1) { param = scst_get_next_token_str(¶ms); if (param == NULL) break; p = scst_get_next_lexem(¶m); if (*p == '\0') break; pp = scst_get_next_lexem(¶m); if (*pp == '\0') goto out_need_param; if (scst_get_next_lexem(¶m)[0] != '\0') goto out_too_many; res = kstrtoul(pp, 0, &val); if (res != 0) goto out_strtoul_failed; if (strcasecmp(SCST_TAS_LABEL, p) == 0) res = scst_restore_tas(dev, val); else if (strcasecmp(SCST_QERR_LABEL, p) == 0) res = scst_restore_qerr(dev, val); else if (strcasecmp(SCST_TMF_ONLY_LABEL, p) == 0) res = scst_restore_tmf_only(dev, val); else if (strcasecmp(SCST_SWP_LABEL, p) == 0) res = scst_restore_swp(dev, val); else if (strcasecmp(SCST_DSENSE_LABEL, p) == 0) res = scst_restore_dsense(dev, val); else if (strcasecmp(SCST_DPICZ_LABEL, p) == 0) res = scst_restore_dpicz(dev, val); else if (strcasecmp(SCST_QUEUE_ALG_LABEL, p) == 0) res = scst_restore_queue_alg(dev, val); else { TRACE_DBG("Unknown parameter %s", p); scst_restore_token_str(p, param); *last_param = p; goto out; } if (res != 0) goto out; } *last_param = NULL; res = 0; out: TRACE_EXIT_RES(res); return res; out_strtoul_failed: PRINT_ERROR("strtoul() for %s failed: %d (device %s)", pp, res, dev->virt_name); goto out; out_need_param: PRINT_ERROR("Parameter %s value missed for device %s", p, dev->virt_name); res = -EINVAL; goto out; out_too_many: PRINT_ERROR("Too many parameter's %s values (device %s)", p, dev->virt_name); res = -EINVAL; goto out; } EXPORT_SYMBOL_GPL(scst_restore_global_mode_pages); /* Must be called under dev_lock and BHs off. Might release it, then reacquire. */ void __scst_ext_blocking_done(struct scst_device *dev) { bool stop; TRACE_ENTRY(); TRACE_BLOCK("Notifying ext blockers for dev %s (ext_blocks_cnt %d)", dev->virt_name, dev->ext_blocks_cnt); stop = list_empty(&dev->ext_blockers_list); while (!stop) { struct scst_ext_blocker *b; b = list_first_entry(&dev->ext_blockers_list, typeof(*b), ext_blockers_list_entry); TRACE_DBG("Notifying async ext blocker %p (cnt %d)", b, dev->ext_blocks_cnt); list_del(&b->ext_blockers_list_entry); stop = list_empty(&dev->ext_blockers_list); if (stop) dev->ext_blocking_pending = 0; spin_unlock_bh(&dev->dev_lock); b->ext_blocker_done_fn(dev, b->ext_blocker_data, b->ext_blocker_data_len); kfree(b); spin_lock_bh(&dev->dev_lock); } TRACE_EXIT(); return; } #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) static void scst_ext_blocking_done_fn(void *p) { struct scst_device *dev = p; #else static void scst_ext_blocking_done_fn(struct work_struct *work) { struct scst_device *dev = container_of(work, struct scst_device, ext_blockers_work); #endif TRACE_ENTRY(); spin_lock_bh(&dev->dev_lock); WARN_ON(!dev->ext_unblock_scheduled); /* We might have new ext blocker any time w/o dev_lock */ while (!list_empty(&dev->ext_blockers_list)) __scst_ext_blocking_done(dev); WARN_ON(!dev->ext_unblock_scheduled); dev->ext_unblock_scheduled = 0; spin_unlock_bh(&dev->dev_lock); TRACE_EXIT(); return; } /* Must be called under dev_lock and BHs off */ void scst_ext_blocking_done(struct scst_device *dev) { TRACE_ENTRY(); lockdep_assert_held(&dev->dev_lock); if (dev->ext_unblock_scheduled) goto out; TRACE_DBG("Scheduling ext_blockers_work for dev %s", dev->virt_name); dev->ext_unblock_scheduled = 1; schedule_work(&dev->ext_blockers_work); out: TRACE_EXIT(); return; } static void scst_sync_ext_blocking_done(struct scst_device *dev, uint8_t *data, int len) { wait_queue_head_t *w; TRACE_ENTRY(); w = (void *)*((unsigned long *)data); wake_up_all(w); TRACE_EXIT(); return; } int scst_ext_block_dev(struct scst_device *dev, ext_blocker_done_fn_t done_fn, const uint8_t *priv, int priv_len, int flags) { int res; struct scst_ext_blocker *b; TRACE_ENTRY(); if (flags & SCST_EXT_BLOCK_SYNC) priv_len = sizeof(void *); b = kzalloc(sizeof(*b) + priv_len, GFP_KERNEL); if (b == NULL) { PRINT_ERROR("Unable to alloc struct scst_ext_blocker with data " "(size %zd)", sizeof(*b) + priv_len); res = -ENOMEM; goto out; } TRACE_MGMT_DBG("New %d ext blocker %p for dev %s (flags %x)", dev->ext_blocks_cnt+1, b, dev->virt_name, flags); spin_lock_bh(&dev->dev_lock); if (dev->strictly_serialized_cmd_waiting) { /* * Avoid deadlock when this strictly serialized cmd * will not proceed stopped on our blocking, so our * blocking does not proceed as well. */ TRACE_DBG("Unstrictlyserialize dev %s", dev->virt_name); dev->strictly_serialized_cmd_waiting = 0; /* We will reuse blocking done by the strictly serialized cmd */ } else scst_block_dev(dev); if (flags & SCST_EXT_BLOCK_STPG) { WARN_ON(dev->stpg_ext_blocked); dev->stpg_ext_blocked = 1; } dev->ext_blocks_cnt++; TRACE_DBG("ext_blocks_cnt %d", dev->ext_blocks_cnt); if ((flags & SCST_EXT_BLOCK_SYNC) && (dev->on_dev_cmd_count == 0)) { TRACE_DBG("No commands to wait for sync blocking (dev %s)", dev->virt_name); spin_unlock_bh(&dev->dev_lock); goto out_free_success; } list_add_tail(&b->ext_blockers_list_entry, &dev->ext_blockers_list); dev->ext_blocking_pending = 1; if (flags & SCST_EXT_BLOCK_SYNC) { DECLARE_WAIT_QUEUE_HEAD_ONSTACK(w); b->ext_blocker_done_fn = scst_sync_ext_blocking_done; *((void **)&b->ext_blocker_data[0]) = &w; wait_event_locked(w, (dev->on_dev_cmd_count == 0), lock_bh, dev->dev_lock); spin_unlock_bh(&dev->dev_lock); } else { b->ext_blocker_done_fn = done_fn; if (priv_len > 0) { b->ext_blocker_data_len = priv_len; memcpy(b->ext_blocker_data, priv, priv_len); } if (dev->on_dev_cmd_count == 0) { TRACE_DBG("No commands to wait for async blocking " "(dev %s)", dev->virt_name); if (!dev->ext_unblock_scheduled) __scst_ext_blocking_done(dev); spin_unlock_bh(&dev->dev_lock); } else spin_unlock_bh(&dev->dev_lock); } out_success: res = 0; out: TRACE_EXIT_RES(res); return res; out_free_success: sBUG_ON(!(flags & SCST_EXT_BLOCK_SYNC)); kfree(b); goto out_success; } void scst_ext_unblock_dev(struct scst_device *dev, bool stpg) { TRACE_ENTRY(); spin_lock_bh(&dev->dev_lock); if (dev->ext_blocks_cnt == 0) { TRACE_DBG("Nothing to unblock (dev %s)", dev->virt_name); goto out_unlock; } if ((dev->ext_blocks_cnt == 1) && dev->stpg_ext_blocked && !stpg) { /* * User space is sending too many unblock calls during * STPG processing */ TRACE_MGMT_DBG("Can not unblock internal STPG ext block " "(dev %s, ext_blocks_cnt %d, stpg_ext_blocked %d, stpg %d)", dev->virt_name, dev->ext_blocks_cnt, dev->stpg_ext_blocked, stpg); goto out_unlock; } dev->ext_blocks_cnt--; TRACE_MGMT_DBG("Ext unblocking for dev %s (left: %d, pending %d)", dev->virt_name, dev->ext_blocks_cnt, dev->ext_blocking_pending); if ((dev->ext_blocks_cnt == 0) && dev->ext_blocking_pending) { int rc; /* Wait pending ext blocking to finish */ spin_unlock_bh(&dev->dev_lock); TRACE_DBG("Ext unblock (dev %s): still pending...", dev->virt_name); rc = scst_ext_block_dev(dev, NULL, NULL, 0, SCST_EXT_BLOCK_SYNC); if (rc != 0) { /* Oops, have to poll */ PRINT_WARNING("scst_ext_block_dev(dev %s) failed, " "switch to polling", dev->virt_name); spin_lock_bh(&dev->dev_lock); while (dev->ext_blocking_pending) { spin_unlock_bh(&dev->dev_lock); msleep(10); spin_lock_bh(&dev->dev_lock); } spin_unlock_bh(&dev->dev_lock); } else { TRACE_DBG("Ext unblock: pending done, unblocking..."); scst_ext_unblock_dev(dev, stpg); } spin_lock_bh(&dev->dev_lock); } scst_unblock_dev(dev); out_unlock: spin_unlock_bh(&dev->dev_lock); TRACE_EXIT(); return; } /* Abstract vfs_unlink() for different kernel versions (as possible) */ #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39) void scst_vfs_unlink_and_put(struct nameidata *nd) { #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25) vfs_unlink(nd->dentry->d_parent->d_inode, nd->dentry); dput(nd->dentry); mntput(nd->mnt); #else vfs_unlink(nd->path.dentry->d_parent->d_inode, nd->path.dentry); path_put(&nd->path); #endif } #else void scst_vfs_unlink_and_put(struct path *path) { #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0) && \ (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7) && \ (!defined(CONFIG_SUSE_KERNEL) || \ LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0)) vfs_unlink(path->dentry->d_parent->d_inode, path->dentry); #else vfs_unlink(path->dentry->d_parent->d_inode, path->dentry, NULL); #endif path_put(path); } #endif #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39) void scst_path_put(struct nameidata *nd) { #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25) dput(nd->dentry); mntput(nd->mnt); #else path_put(&nd->path); #endif } EXPORT_SYMBOL(scst_path_put); #endif int scst_copy_file(const char *src, const char *dest) { int res = 0; struct inode *inode; loff_t file_size, pos; uint8_t *buf = NULL; struct file *file_src = NULL, *file_dest = NULL; mm_segment_t old_fs = get_fs(); TRACE_ENTRY(); if (src == NULL || dest == NULL) { res = -EINVAL; PRINT_ERROR("%s", "Invalid persistent files path - backup " "skipped"); goto out; } TRACE_DBG("Copying '%s' into '%s'", src, dest); set_fs(KERNEL_DS); file_src = filp_open(src, O_RDONLY, 0); if (IS_ERR(file_src)) { res = PTR_ERR(file_src); TRACE_DBG("Unable to open file '%s' - error %d", src, res); goto out_free; } file_dest = filp_open(dest, O_WRONLY | O_CREAT | O_TRUNC, 0644); if (IS_ERR(file_dest)) { res = PTR_ERR(file_dest); TRACE_DBG("Unable to open backup file '%s' - error %d", dest, res); goto out_close; } inode = file_inode(file_src); if (S_ISREG(inode->i_mode)) { /* Nothing to do */ } else if (S_ISBLK(inode->i_mode)) { inode = inode->i_bdev->bd_inode; } else { PRINT_ERROR("Invalid file mode 0x%x", inode->i_mode); res = -EINVAL; set_fs(old_fs); goto out_skip; } file_size = inode->i_size; buf = vmalloc(file_size); if (buf == NULL) { res = -ENOMEM; PRINT_ERROR("%s", "Unable to allocate temporary buffer"); goto out_skip; } pos = 0; res = vfs_read(file_src, (void __force __user *)buf, file_size, &pos); if (res != file_size) { PRINT_ERROR("Unable to read file '%s' - error %d", src, res); goto out_skip; } pos = 0; res = vfs_write(file_dest, (void __force __user *)buf, file_size, &pos); if (res != file_size) { PRINT_ERROR("Unable to write to '%s' - error %d", dest, res); goto out_skip; } res = vfs_fsync(file_dest, 0); if (res != 0) { PRINT_ERROR("fsync() of the backup PR file failed: %d", res); goto out_skip; } out_skip: filp_close(file_dest, NULL); out_close: filp_close(file_src, NULL); out_free: if (buf != NULL) vfree(buf); set_fs(old_fs); out: TRACE_EXIT_RES(res); return res; } int scst_remove_file(const char *name) { int res = 0; #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39) struct nameidata nd; #else struct path path; #endif mm_segment_t old_fs = get_fs(); TRACE_ENTRY(); set_fs(KERNEL_DS); #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39) res = path_lookup(name, 0, &nd); if (!res) scst_vfs_unlink_and_put(&nd); else TRACE_DBG("Unable to lookup file '%s' - error %d", name, res); #else res = kern_path(name, 0, &path); if (!res) scst_vfs_unlink_and_put(&path); else TRACE_DBG("Unable to lookup file '%s' - error %d", name, res); #endif set_fs(old_fs); TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL_GPL(scst_remove_file); /* Returns 0 on success, error code otherwise */ int scst_write_file_transactional(const char *name, const char *name1, const char *signature, int signature_len, const uint8_t *buf, int size) { int res; struct file *file; mm_segment_t old_fs = get_fs(); loff_t pos = 0; char n = '\n'; TRACE_ENTRY(); res = scst_copy_file(name, name1); if ((res != 0) && (res != -ENOENT)) goto out; set_fs(KERNEL_DS); file = filp_open(name, O_WRONLY | O_CREAT | O_TRUNC, 0644); if (IS_ERR(file)) { res = PTR_ERR(file); PRINT_ERROR("Unable to (re)create file '%s' - error %d", name, res); goto out_set_fs; } TRACE_DBG("Writing file '%s'", name); pos = signature_len+1; res = vfs_write(file, (void const __force __user *)buf, size, &pos); if (res != size) goto write_error; res = vfs_fsync(file, 1); if (res != 0) { PRINT_ERROR("fsync() of file %s failed: %d", name, res); goto write_error_close; } pos = 0; res = vfs_write(file, (void const __force __user *)signature, signature_len, &pos); if (res != signature_len) goto write_error; res = vfs_write(file, (void __force __user *)&n, sizeof(n), &pos); if (res != sizeof(n)) goto write_error; res = vfs_fsync(file, 1); if (res != 0) { PRINT_ERROR("fsync() of file %s failed: %d", name, res); goto write_error_close; } res = 0; filp_close(file, NULL); out_set_fs: set_fs(old_fs); if (res == 0) scst_remove_file(name1); else scst_remove_file(name); out: TRACE_EXIT_RES(res); return res; write_error: PRINT_ERROR("Error writing to '%s' - error %d", name, res); write_error_close: filp_close(file, NULL); if (res > 0) res = -EIO; goto out_set_fs; } EXPORT_SYMBOL_GPL(scst_write_file_transactional); static int __scst_read_file_transactional(const char *file_name, const char *signature, int signature_len, uint8_t *buf, int size) { int res; struct file *file = NULL; struct inode *inode; loff_t file_size, pos; mm_segment_t old_fs; TRACE_ENTRY(); old_fs = get_fs(); set_fs(KERNEL_DS); TRACE_DBG("Loading file '%s'", file_name); file = filp_open(file_name, O_RDONLY, 0); if (IS_ERR(file)) { res = PTR_ERR(file); TRACE_DBG("Unable to open file '%s' - error %d", file_name, res); goto out; } inode = file_inode(file); if (S_ISREG(inode->i_mode)) { /* Nothing to do */ } else if (S_ISBLK(inode->i_mode)) { inode = inode->i_bdev->bd_inode; } else { PRINT_ERROR("Invalid file mode 0x%x", inode->i_mode); res = -EINVAL; goto out_close; } file_size = inode->i_size; if (file_size > size) { PRINT_ERROR("Supplied buffer (%d) too small (need %d)", size, (int)file_size); res = -EOVERFLOW; goto out_close; } pos = 0; res = vfs_read(file, (void __force __user *)buf, file_size, &pos); if (res != file_size) { PRINT_ERROR("Unable to read file '%s' - error %d", file_name, res); if (res > 0) res = -EIO; goto out_close; } if (memcmp(buf, signature, signature_len) != 0) { res = -EINVAL; PRINT_ERROR("Invalid signature in file %s", file_name); goto out_close; } out_close: filp_close(file, NULL); out: set_fs(old_fs); TRACE_EXIT_RES(res); return res; } /* * Returns read data size on success, error code otherwise. The first * signature_len+1 bytes of the read data contain signature, so should be * skipped. */ int scst_read_file_transactional(const char *name, const char *name1, const char *signature, int signature_len, uint8_t *buf, int size) { int res; TRACE_ENTRY(); res = __scst_read_file_transactional(name, signature, signature_len, buf, size); if (res <= 0) res = __scst_read_file_transactional(name1, signature, signature_len, buf, size); if (res > 0) TRACE_BUFFER("Read data", buf, res); TRACE_EXIT_RES(res); return res; } EXPORT_SYMBOL_GPL(scst_read_file_transactional); /* * Return the file mode if @path exists or an error code if opening @path via * filp_open() in read-only mode failed. */ int scst_get_file_mode(const char *path) { struct file *file; int res; file = filp_open(path, O_RDONLY, 0400); if (IS_ERR(file)) { res = PTR_ERR(file); goto out; } res = file_inode(file)->i_mode; filp_close(file, NULL); out: return res; } EXPORT_SYMBOL(scst_get_file_mode); /* * Return true if either @path does not contain a slash or if the directory * specified in @path exists. */ bool scst_parent_dir_exists(const char *path) { const char *last_slash = strrchr(path, '/'); const char *dir; int dir_mode; bool res = true; if (last_slash && last_slash > path) { dir = kasprintf(GFP_KERNEL, "%.*s", (int)(last_slash - path), path); if (dir) { dir_mode = scst_get_file_mode(dir); kfree(dir); res = dir_mode >= 0 && S_ISDIR(dir_mode); } else { res = false; } } return res; } EXPORT_SYMBOL(scst_parent_dir_exists); static void __init scst_scsi_op_list_init(void) { int i; uint8_t op = 0xff; TRACE_ENTRY(); TRACE_DBG("tblsize=%d", SCST_CDB_TBL_SIZE); for (i = 0; i < 256; i++) scst_scsi_op_list[i] = SCST_CDB_TBL_SIZE; for (i = 0; i < SCST_CDB_TBL_SIZE; i++) { if (scst_scsi_op_table[i].ops != op) { op = scst_scsi_op_table[i].ops; scst_scsi_op_list[op] = i; } } TRACE_BUFFER("scst_scsi_op_list", scst_scsi_op_list, sizeof(scst_scsi_op_list)); scst_release_acg_wq = create_workqueue("scst_release_acg"); WARN_ON_ONCE(IS_ERR(scst_release_acg_wq)); TRACE_EXIT(); return; } int __init scst_lib_init(void) { int res = 0; scst_scsi_op_list_init(); #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) scsi_io_context_cache = kmem_cache_create("scst_scsi_io_context", sizeof(struct scsi_io_context), __alignof__(struct scsi_io_context), SCST_SLAB_FLAGS|SLAB_HWCACHE_ALIGN, NULL); if (!scsi_io_context_cache) { PRINT_ERROR("%s", "Can't init scsi io context cache"); res = -ENOMEM; goto out; } out: #endif TRACE_EXIT_RES(res); return res; } void scst_lib_exit(void) { /* Wait until any ongoing acg->put_work has finished. */ flush_workqueue(scst_release_acg_wq); destroy_workqueue(scst_release_acg_wq); #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) BUILD_BUG_ON(SCST_MAX_CDB_SIZE != BLK_MAX_CDB); BUILD_BUG_ON(SCST_SENSE_BUFFERSIZE < SCSI_SENSE_BUFFERSIZE); kmem_cache_destroy(scsi_io_context_cache); #endif } #ifdef CONFIG_SCST_DEBUG /** * scst_random() - return a pseudo-random number for debugging purposes. * * Returns a pseudo-random number for debugging purposes. Available only in * the DEBUG build. * * Original taken from the XFS code */ unsigned long scst_random(void) { static int Inited; static unsigned long RandomValue; static DEFINE_SPINLOCK(lock); /* cycles pseudo-randomly through all values between 1 and 2^31 - 2 */ register long rv; register long lo; register long hi; unsigned long flags; spin_lock_irqsave(&lock, flags); if (!Inited) { RandomValue = jiffies; Inited = 1; } rv = RandomValue; hi = rv / 127773; lo = rv % 127773; rv = 16807 * lo - 2836 * hi; if (rv <= 0) rv += 2147483647; RandomValue = rv; spin_unlock_irqrestore(&lock, flags); return rv; } EXPORT_SYMBOL_GPL(scst_random); #endif /* CONFIG_SCST_DEBUG */ #ifdef CONFIG_SCST_DEBUG_TM #define TM_DBG_STATE_ABORT 0 #define TM_DBG_STATE_RESET 1 #define TM_DBG_STATE_OFFLINE 2 #define INIT_TM_DBG_STATE TM_DBG_STATE_ABORT static void tm_dbg_timer_fn(unsigned long arg); static DEFINE_SPINLOCK(scst_tm_dbg_lock); /* All serialized by scst_tm_dbg_lock */ static struct { unsigned int tm_dbg_release:1; unsigned int tm_dbg_blocked:1; } tm_dbg_flags; static LIST_HEAD(tm_dbg_delayed_cmd_list); static int tm_dbg_delayed_cmds_count; static int tm_dbg_passed_cmds_count; static int tm_dbg_state; static int tm_dbg_on_state_passes; static DEFINE_TIMER(tm_dbg_timer, tm_dbg_timer_fn, 0, 0); static struct scst_tgt_dev *tm_dbg_tgt_dev; static const int tm_dbg_on_state_num_passes[] = { 5, 1, 0x7ffffff }; static void tm_dbg_init_tgt_dev(struct scst_tgt_dev *tgt_dev) { if (tgt_dev->lun == 15) { unsigned long flags; if (tm_dbg_tgt_dev != NULL) tm_dbg_deinit_tgt_dev(tm_dbg_tgt_dev); spin_lock_irqsave(&scst_tm_dbg_lock, flags); tm_dbg_state = INIT_TM_DBG_STATE; tm_dbg_on_state_passes = tm_dbg_on_state_num_passes[tm_dbg_state]; tm_dbg_tgt_dev = tgt_dev; PRINT_INFO("LUN %lld connected from initiator %s is under " "TM debugging (tgt_dev %p)", (unsigned long long)tgt_dev->lun, tgt_dev->sess->initiator_name, tgt_dev); spin_unlock_irqrestore(&scst_tm_dbg_lock, flags); } return; } static void tm_dbg_deinit_tgt_dev(struct scst_tgt_dev *tgt_dev) { if (tm_dbg_tgt_dev == tgt_dev) { unsigned long flags; TRACE_MGMT_DBG("Deinit TM debugging tgt_dev %p", tgt_dev); del_timer_sync(&tm_dbg_timer); spin_lock_irqsave(&scst_tm_dbg_lock, flags); tm_dbg_tgt_dev = NULL; spin_unlock_irqrestore(&scst_tm_dbg_lock, flags); } return; } static void tm_dbg_timer_fn(unsigned long arg) { TRACE_MGMT_DBG("%s", "delayed cmd timer expired"); tm_dbg_flags.tm_dbg_release = 1; wake_up_all(&tm_dbg_tgt_dev->active_cmd_threads->cmd_list_waitQ); return; } /* Called under scst_tm_dbg_lock and IRQs off */ static void tm_dbg_delay_cmd(struct scst_cmd *cmd) { switch (tm_dbg_state) { case TM_DBG_STATE_ABORT: if (tm_dbg_delayed_cmds_count == 0) { unsigned long d = 58*HZ + (scst_random() % (4*HZ)); TRACE_MGMT_DBG("STATE ABORT: delaying cmd %p (tag %llu)" " for %ld.%ld seconds (%ld HZ), " "tm_dbg_on_state_passes=%d", cmd, cmd->tag, d/HZ, (d%HZ)*100/HZ, d, tm_dbg_on_state_passes); mod_timer(&tm_dbg_timer, jiffies + d); #if 0 tm_dbg_flags.tm_dbg_blocked = 1; #endif } else { TRACE_MGMT_DBG("Delaying another timed cmd %p " "(tag %llu), delayed_cmds_count=%d, " "tm_dbg_on_state_passes=%d", cmd, cmd->tag, tm_dbg_delayed_cmds_count, tm_dbg_on_state_passes); if (tm_dbg_delayed_cmds_count == 2) tm_dbg_flags.tm_dbg_blocked = 0; } break; case TM_DBG_STATE_RESET: case TM_DBG_STATE_OFFLINE: TRACE_MGMT_DBG("STATE RESET/OFFLINE: delaying cmd %p " "(tag %llu), delayed_cmds_count=%d, " "tm_dbg_on_state_passes=%d", cmd, cmd->tag, tm_dbg_delayed_cmds_count, tm_dbg_on_state_passes); tm_dbg_flags.tm_dbg_blocked = 1; break; default: sBUG(); } /* IRQs already off */ spin_lock(&cmd->cmd_threads->cmd_list_lock); list_add_tail(&cmd->cmd_list_entry, &tm_dbg_delayed_cmd_list); spin_unlock(&cmd->cmd_threads->cmd_list_lock); cmd->tm_dbg_delayed = 1; tm_dbg_delayed_cmds_count++; return; } /* No locks */ void tm_dbg_check_released_cmds(void) { if (tm_dbg_flags.tm_dbg_release) { struct scst_cmd *cmd, *tc; spin_lock_irq(&scst_tm_dbg_lock); list_for_each_entry_safe_reverse(cmd, tc, &tm_dbg_delayed_cmd_list, cmd_list_entry) { TRACE_MGMT_DBG("Releasing timed cmd %p (tag %llu), " "delayed_cmds_count=%d", cmd, cmd->tag, tm_dbg_delayed_cmds_count); spin_lock(&cmd->cmd_threads->cmd_list_lock); list_move(&cmd->cmd_list_entry, &cmd->cmd_threads->active_cmd_list); spin_unlock(&cmd->cmd_threads->cmd_list_lock); } tm_dbg_flags.tm_dbg_release = 0; spin_unlock_irq(&scst_tm_dbg_lock); } } /* Called under scst_tm_dbg_lock, but can drop it inside, then reget */ static void tm_dbg_change_state(unsigned long *flags) { tm_dbg_flags.tm_dbg_blocked = 0; if (--tm_dbg_on_state_passes == 0) { switch (tm_dbg_state) { case TM_DBG_STATE_ABORT: TRACE_MGMT_DBG("%s", "Changing " "tm_dbg_state to RESET"); tm_dbg_state = TM_DBG_STATE_RESET; tm_dbg_flags.tm_dbg_blocked = 0; break; case TM_DBG_STATE_RESET: case TM_DBG_STATE_OFFLINE: #ifdef CONFIG_SCST_TM_DBG_GO_OFFLINE TRACE_MGMT_DBG("%s", "Changing " "tm_dbg_state to OFFLINE"); tm_dbg_state = TM_DBG_STATE_OFFLINE; #else TRACE_MGMT_DBG("%s", "Changing " "tm_dbg_state to ABORT"); tm_dbg_state = TM_DBG_STATE_ABORT; #endif break; default: sBUG(); } tm_dbg_on_state_passes = tm_dbg_on_state_num_passes[tm_dbg_state]; } TRACE_MGMT_DBG("%s", "Deleting timer"); spin_unlock_irqrestore(&scst_tm_dbg_lock, *flags); del_timer_sync(&tm_dbg_timer); spin_lock_irqsave(&scst_tm_dbg_lock, *flags); return; } /* No locks */ int tm_dbg_check_cmd(struct scst_cmd *cmd) { int res = 0; unsigned long flags; if (cmd->tm_dbg_immut) goto out; if (cmd->tm_dbg_delayed) { spin_lock_irqsave(&scst_tm_dbg_lock, flags); TRACE_MGMT_DBG("Processing delayed cmd %p (tag %llu), " "delayed_cmds_count=%d", cmd, cmd->tag, tm_dbg_delayed_cmds_count); cmd->tm_dbg_immut = 1; tm_dbg_delayed_cmds_count--; if ((tm_dbg_delayed_cmds_count == 0) && (tm_dbg_state == TM_DBG_STATE_ABORT)) tm_dbg_change_state(&flags); spin_unlock_irqrestore(&scst_tm_dbg_lock, flags); } else if (cmd->tgt_dev && (tm_dbg_tgt_dev == cmd->tgt_dev)) { /* Delay 5000th command */ spin_lock_irqsave(&scst_tm_dbg_lock, flags); if (tm_dbg_flags.tm_dbg_blocked || (++tm_dbg_passed_cmds_count % 5000) == 0) { tm_dbg_delay_cmd(cmd); res = 1; } else cmd->tm_dbg_immut = 1; spin_unlock_irqrestore(&scst_tm_dbg_lock, flags); } out: return res; } /* No locks */ void tm_dbg_release_cmd(struct scst_cmd *cmd) { struct scst_cmd *c; unsigned long flags; spin_lock_irqsave(&scst_tm_dbg_lock, flags); list_for_each_entry(c, &tm_dbg_delayed_cmd_list, cmd_list_entry) { if (c == cmd) { TRACE_MGMT_DBG("Abort request for " "delayed cmd %p (tag=%llu), moving it to " "active cmd list (delayed_cmds_count=%d)", c, c->tag, tm_dbg_delayed_cmds_count); if (!(in_atomic() || in_interrupt() || irqs_disabled())) msleep(2000); if (!test_bit(SCST_CMD_ABORTED_OTHER, &cmd->cmd_flags)) { /* Test how completed commands handled */ if (((scst_random() % 10) == 5)) { scst_set_cmd_error(cmd, SCST_LOAD_SENSE( scst_sense_internal_failure)); /* It's completed now */ } } spin_lock(&cmd->cmd_threads->cmd_list_lock); list_move(&c->cmd_list_entry, &c->cmd_threads->active_cmd_list); wake_up(&c->cmd_threads->cmd_list_waitQ); spin_unlock(&cmd->cmd_threads->cmd_list_lock); break; } } spin_unlock_irqrestore(&scst_tm_dbg_lock, flags); return; } /* Might be called under scst_mutex */ void tm_dbg_task_mgmt(struct scst_device *dev, const char *fn, int force) { unsigned long flags; if (dev != NULL) { if (tm_dbg_tgt_dev == NULL) goto out; if (tm_dbg_tgt_dev->dev != dev) goto out; } spin_lock_irqsave(&scst_tm_dbg_lock, flags); if ((tm_dbg_state != TM_DBG_STATE_OFFLINE) || force) { TRACE_MGMT_DBG("%s: freeing %d delayed cmds", fn, tm_dbg_delayed_cmds_count); tm_dbg_change_state(&flags); tm_dbg_flags.tm_dbg_release = 1; /* * Used to make sure that all woken up threads see the new * value. */ smp_wmb(); if (tm_dbg_tgt_dev != NULL) wake_up_all(&tm_dbg_tgt_dev->active_cmd_threads->cmd_list_waitQ); } else { TRACE_MGMT_DBG("%s: while OFFLINE state, doing nothing", fn); } spin_unlock_irqrestore(&scst_tm_dbg_lock, flags); out: return; } int tm_dbg_is_release(void) { return tm_dbg_flags.tm_dbg_release; } #endif /* CONFIG_SCST_DEBUG_TM */ #ifdef CONFIG_SCST_DEBUG_SN void scst_check_debug_sn(struct scst_cmd *cmd) { int old = cmd->queue_type; /* To simulate from time to time queue flushing */ if (!in_interrupt() && (scst_random() % 120) == 8) { int t = scst_random() % 1200; TRACE_SN("Delaying IO on %d ms", t); msleep(t); } if ((scst_random() % 15) == 7) cmd->queue_type = SCST_CMD_QUEUE_ORDERED; else if ((scst_random() % 1000) == 751) cmd->queue_type = SCST_CMD_QUEUE_HEAD_OF_QUEUE; else if ((scst_random() % 1000) == 752) cmd->queue_type = SCST_CMD_QUEUE_SIMPLE; if (old != cmd->queue_type) TRACE_SN("DbgSN queue type changed for cmd %p from %d to %d", cmd, old, cmd->queue_type); return; } #endif /* CONFIG_SCST_DEBUG_SN */ #ifdef CONFIG_SCST_MEASURE_LATENCY #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16) static uint64_t scst_get_usec(void) { struct timespec ts; ktime_get_ts(&ts); return ((uint64_t)ts.tv_sec * 1000000000 + ts.tv_nsec) / 1000; } #else /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16) */ static uint64_t scst_get_usec(void) { ktime_t t; t = ktime_get(); return ktime_to_us(t); } #endif void scst_set_start_time(struct scst_cmd *cmd) { cmd->start = scst_get_usec(); TRACE_DBG("cmd %p: start %lld", cmd, cmd->start); } void scst_set_cur_start(struct scst_cmd *cmd) { cmd->curr_start = scst_get_usec(); TRACE_DBG("cmd %p: cur_start %lld", cmd, cmd->curr_start); } void scst_set_parse_time(struct scst_cmd *cmd) { cmd->parse_time += scst_get_usec() - cmd->curr_start; TRACE_DBG("cmd %p: parse_time %lld", cmd, cmd->parse_time); } void scst_set_dev_alloc_buf_time(struct scst_cmd *cmd) { cmd->dev_alloc_buf_time += scst_get_usec() - cmd->curr_start; TRACE_DBG("cmd %p: dev_alloc_buf_time %lld", cmd, cmd->dev_alloc_buf_time); } void scst_set_tgt_alloc_buf_time(struct scst_cmd *cmd) { cmd->tgt_alloc_buf_time += scst_get_usec() - cmd->curr_start; TRACE_DBG("cmd %p: tgt_alloc_buf_time %lld", cmd, cmd->tgt_alloc_buf_time); } void scst_set_restart_waiting_time(struct scst_cmd *cmd) { cmd->restart_waiting_time += scst_get_usec() - cmd->curr_start; TRACE_DBG("cmd %p: restart_waiting_time %lld", cmd, cmd->restart_waiting_time); } void scst_set_rdy_to_xfer_time(struct scst_cmd *cmd) { cmd->rdy_to_xfer_time += scst_get_usec() - cmd->curr_start; TRACE_DBG("cmd %p: rdy_to_xfer_time %lld", cmd, cmd->rdy_to_xfer_time); } void scst_set_pre_exec_time(struct scst_cmd *cmd) { cmd->pre_exec_time += scst_get_usec() - cmd->curr_start; TRACE_DBG("cmd %p: pre_exec_time %lld", cmd, cmd->pre_exec_time); } void scst_set_exec_start(struct scst_cmd *cmd) { cmd->exec_time_counting = true; scst_set_cur_start(cmd); } void scst_set_exec_time(struct scst_cmd *cmd) { if (!cmd->exec_time_counting) return; cmd->exec_time_counting = false; cmd->exec_time += scst_get_usec() - cmd->curr_start; TRACE_DBG("cmd %p: exec_time %lld", cmd, cmd->exec_time); } void scst_set_dev_done_time(struct scst_cmd *cmd) { cmd->dev_done_time += scst_get_usec() - cmd->curr_start; TRACE_DBG("cmd %p: dev_done_time %lld", cmd, cmd->dev_done_time); } void scst_set_xmit_time(struct scst_cmd *cmd) { cmd->xmit_time += scst_get_usec() - cmd->curr_start; TRACE_DBG("cmd %p: xmit_time %lld", cmd, cmd->xmit_time); } void scst_update_lat_stats(struct scst_cmd *cmd) { int64_t finish, scst_time, tgt_time, dev_time; struct scst_session *sess = cmd->sess; int data_len; int i; struct scst_ext_latency_stat *latency_stat, *dev_latency_stat; bool ignore_max = false; finish = scst_get_usec(); /* Determine the IO size for extended latency statistics */ data_len = cmd->bufflen; i = SCST_LATENCY_STAT_INDEX_OTHER; if (data_len <= SCST_IO_SIZE_THRESHOLD_SMALL) i = SCST_LATENCY_STAT_INDEX_SMALL; else if (data_len <= SCST_IO_SIZE_THRESHOLD_MEDIUM) i = SCST_LATENCY_STAT_INDEX_MEDIUM; else if (data_len <= SCST_IO_SIZE_THRESHOLD_LARGE) i = SCST_LATENCY_STAT_INDEX_LARGE; else if (data_len <= SCST_IO_SIZE_THRESHOLD_VERY_LARGE) i = SCST_LATENCY_STAT_INDEX_VERY_LARGE; latency_stat = &sess->sess_latency_stat[i]; if (cmd->tgt_dev != NULL) dev_latency_stat = &cmd->tgt_dev->dev_latency_stat[i]; else dev_latency_stat = NULL; /* Calculate the latencies */ scst_time = finish - cmd->start - (cmd->parse_time + cmd->dev_alloc_buf_time + cmd->tgt_alloc_buf_time + cmd->restart_waiting_time + cmd->rdy_to_xfer_time + cmd->pre_exec_time + cmd->exec_time + cmd->dev_done_time + cmd->xmit_time); tgt_time = cmd->tgt_alloc_buf_time + cmd->restart_waiting_time + cmd->rdy_to_xfer_time + cmd->pre_exec_time + cmd->xmit_time; dev_time = cmd->parse_time + cmd->dev_alloc_buf_time + cmd->exec_time + cmd->dev_done_time; if (unlikely((scst_time < 0) || (tgt_time < 0) || (dev_time < 0))) { /* It might happen due to small difference in time between CPUs */ static int q; if (q++ < 20) { PRINT_WARNING("Ignoring max latency sample, because time is " "moving backward (cmd %p, scst %lld, tgt %lld, " "dev %lld)", cmd, (long long) scst_time, (long long) tgt_time, (long long) dev_time); } ignore_max = true; /* * We should not ignore this sample, because the time * difference mistake can be both negative and positive. */ } spin_lock_bh(&sess->lat_lock); /* Save the basic latency information */ sess->scst_time += scst_time; sess->tgt_time += tgt_time; sess->dev_time += dev_time; sess->processed_cmds++; if ((sess->min_scst_time == 0) || (sess->min_scst_time > scst_time)) sess->min_scst_time = scst_time; if ((sess->min_tgt_time == 0) || (sess->min_tgt_time > tgt_time)) sess->min_tgt_time = tgt_time; if ((sess->min_dev_time == 0) || (sess->min_dev_time > dev_time)) sess->min_dev_time = dev_time; if (likely(!ignore_max)) { if (sess->max_scst_time < scst_time) sess->max_scst_time = scst_time; if (sess->max_tgt_time < tgt_time) sess->max_tgt_time = tgt_time; if (sess->max_dev_time < dev_time) sess->max_dev_time = dev_time; } /* Save the extended latency information */ if (cmd->data_direction & SCST_DATA_READ) { latency_stat->scst_time_rd += scst_time; latency_stat->tgt_time_rd += tgt_time; latency_stat->dev_time_rd += dev_time; latency_stat->processed_cmds_rd++; if ((latency_stat->min_scst_time_rd == 0) || (latency_stat->min_scst_time_rd > scst_time)) latency_stat->min_scst_time_rd = scst_time; if ((latency_stat->min_tgt_time_rd == 0) || (latency_stat->min_tgt_time_rd > tgt_time)) latency_stat->min_tgt_time_rd = tgt_time; if ((latency_stat->min_dev_time_rd == 0) || (latency_stat->min_dev_time_rd > dev_time)) latency_stat->min_dev_time_rd = dev_time; if (likely(!ignore_max)) { if (latency_stat->max_scst_time_rd < scst_time) latency_stat->max_scst_time_rd = scst_time; if (latency_stat->max_tgt_time_rd < tgt_time) latency_stat->max_tgt_time_rd = tgt_time; if (latency_stat->max_dev_time_rd < dev_time) latency_stat->max_dev_time_rd = dev_time; } if (dev_latency_stat != NULL) { dev_latency_stat->scst_time_rd += scst_time; dev_latency_stat->tgt_time_rd += tgt_time; dev_latency_stat->dev_time_rd += dev_time; dev_latency_stat->processed_cmds_rd++; if ((dev_latency_stat->min_scst_time_rd == 0) || (dev_latency_stat->min_scst_time_rd > scst_time)) dev_latency_stat->min_scst_time_rd = scst_time; if ((dev_latency_stat->min_tgt_time_rd == 0) || (dev_latency_stat->min_tgt_time_rd > tgt_time)) dev_latency_stat->min_tgt_time_rd = tgt_time; if ((dev_latency_stat->min_dev_time_rd == 0) || (dev_latency_stat->min_dev_time_rd > dev_time)) dev_latency_stat->min_dev_time_rd = dev_time; if (likely(!ignore_max)) { if (dev_latency_stat->max_scst_time_rd < scst_time) dev_latency_stat->max_scst_time_rd = scst_time; if (dev_latency_stat->max_tgt_time_rd < tgt_time) dev_latency_stat->max_tgt_time_rd = tgt_time; if (dev_latency_stat->max_dev_time_rd < dev_time) dev_latency_stat->max_dev_time_rd = dev_time; } } } else if (cmd->data_direction & SCST_DATA_WRITE) { latency_stat->scst_time_wr += scst_time; latency_stat->tgt_time_wr += tgt_time; latency_stat->dev_time_wr += dev_time; latency_stat->processed_cmds_wr++; if ((latency_stat->min_scst_time_wr == 0) || (latency_stat->min_scst_time_wr > scst_time)) latency_stat->min_scst_time_wr = scst_time; if ((latency_stat->min_tgt_time_wr == 0) || (latency_stat->min_tgt_time_wr > tgt_time)) latency_stat->min_tgt_time_wr = tgt_time; if ((latency_stat->min_dev_time_wr == 0) || (latency_stat->min_dev_time_wr > dev_time)) latency_stat->min_dev_time_wr = dev_time; if (likely(!ignore_max)) { if (latency_stat->max_scst_time_wr < scst_time) latency_stat->max_scst_time_wr = scst_time; if (latency_stat->max_tgt_time_wr < tgt_time) latency_stat->max_tgt_time_wr = tgt_time; if (latency_stat->max_dev_time_wr < dev_time) latency_stat->max_dev_time_wr = dev_time; } if (dev_latency_stat != NULL) { dev_latency_stat->scst_time_wr += scst_time; dev_latency_stat->tgt_time_wr += tgt_time; dev_latency_stat->dev_time_wr += dev_time; dev_latency_stat->processed_cmds_wr++; if ((dev_latency_stat->min_scst_time_wr == 0) || (dev_latency_stat->min_scst_time_wr > scst_time)) dev_latency_stat->min_scst_time_wr = scst_time; if ((dev_latency_stat->min_tgt_time_wr == 0) || (dev_latency_stat->min_tgt_time_wr > tgt_time)) dev_latency_stat->min_tgt_time_wr = tgt_time; if ((dev_latency_stat->min_dev_time_wr == 0) || (dev_latency_stat->min_dev_time_wr > dev_time)) dev_latency_stat->min_dev_time_wr = dev_time; if (likely(!ignore_max)) { if (dev_latency_stat->max_scst_time_wr < scst_time) dev_latency_stat->max_scst_time_wr = scst_time; if (dev_latency_stat->max_tgt_time_wr < tgt_time) dev_latency_stat->max_tgt_time_wr = tgt_time; if (dev_latency_stat->max_dev_time_wr < dev_time) dev_latency_stat->max_dev_time_wr = dev_time; } } } spin_unlock_bh(&sess->lat_lock); TRACE_DBG("cmd %p: finish %lld, scst_time %lld, " "tgt_time %lld, dev_time %lld", cmd, finish, scst_time, tgt_time, dev_time); return; } #endif /* CONFIG_SCST_MEASURE_LATENCY */