// TODO add copyright

#ifndef _S3_LOCAL_
#define _S3_LOCAL_

#ifdef _S3_DEVEL_

#include <stdint.h>
#include <linux/types.h>
#include <linux/byteorder/little_endian.h>

#define BTRFS_FIRST_FREE_OBJECTID 256ULL
#define BTRFS_LAST_FREE_OBJECTID -256ULL

/*
 * root backrefs tie subvols and snapshots to the directory entries that
 * reference them
 */
#define S3_ROOT_BACKREF_KEY  144

/*
 * root refs make a fast index for listing all of the snapshots and
 * subvolumes referenced by a given root.  They point directly to the
 * directory item in the root that references the subvol
 */
#define S3_ROOT_REF_KEY      156

/*
 * root items point to tree roots.  There are typically in the root
 * tree used by the super block to find all the other trees
 */
#define S3_ROOT_ITEM_KEY     132

/*
 * this is used for both forward and backward root refs
 */
struct btrfs_root_ref {
	__le64 dirid;
	__le64 sequence;
	__le16 name_len;
} __attribute__ ((__packed__));

#define S3_SETGET_STACK_FUNCS(name, type, member, bits)              \
static inline uint##bits##_t btrfs_##name(const type *s)                \
{                                                                       \
	return __le##bits##_to_cpu(s->member);                          \
}                                                                       \
static inline void btrfs_set_##name(type *s, uint##bits##_t val)        \
{                                                                       \
	s->member = __cpu_to_le##bits(val);                             \
}

S3_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);

#endif // _S3_DEVEL_

#endif // _S3_LOCAL_