2 files changed, 15 insertions, 2 deletions

diff --git a/block/bsg.c b/block/bsg.c
index 0ce8806dd0c..0f63b91d0af 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -353,6 +353,8 @@ static void bsg_rq_end_io(struct request *rq, int uptodate)
 static void bsg_add_command(struct bsg_device *bd, struct request_queue *q,
                             struct bsg_command *bc, struct request *rq)
 {
+        int at_head = (0 == (bc->hdr.flags & BSG_FLAG_Q_AT_TAIL));
+
         /*
          * add bc command to busy queue and submit rq for io
          */
@@ -368,7 +370,7 @@ static void bsg_add_command(struct bsg_device *bd, struct request_queue *q,
         dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc);
 
         rq->end_io_data = bc;
-        blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io);
+        blk_execute_rq_nowait(q, NULL, rq, at_head, bsg_rq_end_io);
 }
 
 static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd)
@@ -924,6 +926,7 @@ static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                 struct request *rq;
                 struct bio *bio, *bidi_bio = NULL;
                 struct sg_io_v4 hdr;
+                int at_head;
                 u8 sense[SCSI_SENSE_BUFFERSIZE];
 
                 if (copy_from_user(&hdr, uarg, sizeof(hdr)))
@@ -936,7 +939,9 @@ static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                 bio = rq->bio;
                 if (rq->next_rq)
                         bidi_bio = rq->next_rq->bio;
-                blk_execute_rq(bd->queue, NULL, rq, 0);
+
+                at_head = (0 == (hdr.flags & BSG_FLAG_Q_AT_TAIL));
+                blk_execute_rq(bd->queue, NULL, rq, at_head);
                 ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio);
 
                 if (copy_to_user(uarg, &hdr, sizeof(hdr)))
diff --git a/include/linux/bsg.h b/include/linux/bsg.h
index cf0303a6061..3f0c64ace42 100644
--- a/include/linux/bsg.h
+++ b/include/linux/bsg.h
@@ -7,6 +7,14 @@
 #define BSG_SUB_PROTOCOL_SCSI_TMF       1
 #define BSG_SUB_PROTOCOL_SCSI_TRANSPORT 2
 
+/*
+ * For flags member below
+ * sg.h sg_io_hdr also has bits defined for it's flags member. However
+ * none of these bits are implemented/used by bsg. The bits below are
+ * allocated to not conflict with sg.h ones anyway.
+ */
+#define BSG_FLAG_Q_AT_TAIL 0x10 /* default, == 0 at this bit, is Q_AT_HEAD */
+
 struct sg_io_v4 {
         __s32 guard;            /* [i] 'Q' to differentiate from v3 */
         __u32 protocol;         /* [i] 0 -> SCSI , .... */