diff options
| -rw-r--r-- | block/bsg.c | 9 | ||||
| -rw-r--r-- | include/linux/bsg.h | 8 |
2 files changed, 15 insertions, 2 deletions
diff --git a/block/bsg.c b/block/bsg.c index 0ce8806dd0c1..0f63b91d0af6 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 cf0303a60611..3f0c64ace424 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 , .... */ |