diff -upr linux-2.6.18/drivers/scsi/scsi_lib.c linux-2.6.18/drivers/scsi/scsi_lib.c
--- linux-2.6.18/drivers/scsi/scsi_lib.c	2006-09-20 07:42:06.000000000 +0400
+++ linux-2.6.18/drivers/scsi/scsi_lib.c	2007-07-04 21:15:32.000000000 +0400
@@ -367,7 +367,7 @@ free_bios:
 }
 
 /**
- * scsi_execute_async - insert request
+ * __scsi_execute_async - insert request
  * @sdev:	scsi device
  * @cmd:	scsi command
  * @cmd_len:	length of scsi cdb
@@ -378,11 +378,14 @@ free_bios:
  * @timeout:	request timeout in seconds
  * @retries:	number of times to retry request
  * @flags:	or into request flags
+ * @at_head:	insert request at head or tail of queue
  **/
-int scsi_execute_async(struct scsi_device *sdev, const unsigned char *cmd,
+static inline int __scsi_execute_async(struct scsi_device *sdev,
+		       const unsigned char *cmd,
 		       int cmd_len, int data_direction, void *buffer, unsigned bufflen,
 		       int use_sg, int timeout, int retries, void *privdata,
-		       void (*done)(void *, char *, int, int), gfp_t gfp)
+		       void (*done)(void *, char *, int, int), gfp_t gfp,
+		       int at_head)
 {
 	struct request *req;
 	struct scsi_io_context *sioc;
@@ -418,7 +421,7 @@ int scsi_execute_async(struct scsi_devic
 	sioc->data = privdata;
 	sioc->done = done;
 
-	blk_execute_rq_nowait(req->q, NULL, req, 1, scsi_end_async);
+	blk_execute_rq_nowait(req->q, NULL, req, at_head, scsi_end_async);
 	return 0;
 
 free_req:
@@ -427,8 +430,53 @@ free_sense:
 	kfree(sioc);
 	return DRIVER_ERROR << 24;
 }
+
+/**
+ * scsi_execute_async - insert request
+ * @sdev:	scsi device
+ * @cmd:	scsi command
+ * @cmd_len:	length of scsi cdb
+ * @data_direction: data direction
+ * @buffer:	data buffer (this can be a kernel buffer or scatterlist)
+ * @bufflen:	len of buffer
+ * @use_sg:	if buffer is a scatterlist this is the number of elements
+ * @timeout:	request timeout in seconds
+ * @retries:	number of times to retry request
+ * @flags:	or into request flags
+ **/
+int scsi_execute_async(struct scsi_device *sdev, const unsigned char *cmd,
+		       int cmd_len, int data_direction, void *buffer, unsigned bufflen,
+		       int use_sg, int timeout, int retries, void *privdata,
+		       void (*done)(void *, char *, int, int), gfp_t gfp)
+{
+	return __scsi_execute_async(sdev, cmd, cmd_len, data_direction, buffer,
+		bufflen, use_sg, timeout, retries, privdata, done, gfp, 1);
+}
 EXPORT_SYMBOL_GPL(scsi_execute_async);
 
+/**
+ * scsi_execute_async_fifo - insert request at tail, in FIFO order
+ * @sdev:	scsi device
+ * @cmd:	scsi command
+ * @cmd_len:	length of scsi cdb
+ * @data_direction: data direction
+ * @buffer:	data buffer (this can be a kernel buffer or scatterlist)
+ * @bufflen:	len of buffer
+ * @use_sg:	if buffer is a scatterlist this is the number of elements
+ * @timeout:	request timeout in seconds
+ * @retries:	number of times to retry request
+ * @flags:	or into request flags
+ **/
+int scsi_execute_async_fifo(struct scsi_device *sdev, const unsigned char *cmd,
+		       int cmd_len, int data_direction, void *buffer, unsigned bufflen,
+		       int use_sg, int timeout, int retries, void *privdata,
+		       void (*done)(void *, char *, int, int), gfp_t gfp)
+{
+	return __scsi_execute_async(sdev, cmd, cmd_len, data_direction, buffer,
+		bufflen, use_sg, timeout, retries, privdata, done, gfp, 0);
+}
+EXPORT_SYMBOL_GPL(scsi_execute_async_fifo);
+
 /*
  * Function:    scsi_init_cmd_errh()
  *
diff -upr linux-2.6.18/include/scsi/scsi_device.h linux-2.6.18/include/scsi/scsi_device.h
--- linux-2.6.18/include/scsi/scsi_device.h	2006-09-20 07:42:06.000000000 +0400
+++ linux-2.6.18/include/scsi/scsi_device.h	2007-07-04 21:15:32.000000000 +0400
@@ -335,6 +335,13 @@ extern int scsi_execute_async(struct scs
 			      int timeout, int retries, void *privdata,
 			      void (*done)(void *, char *, int, int),
 			      gfp_t gfp);
+#define SCSI_EXEC_REQ_FIFO_DEFINED
+extern int scsi_execute_async_fifo(struct scsi_device *sdev,
+			      const unsigned char *cmd, int cmd_len, int data_direction,
+			      void *buffer, unsigned bufflen, int use_sg,
+			      int timeout, int retries, void *privdata,
+			      void (*done)(void *, char *, int, int),
+			      gfp_t gfp);
 
 static inline void scsi_device_reprobe(struct scsi_device *sdev)
 {