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authorMartin K. Petersen <martin.petersen@oracle.com>2012-09-18 12:19:25 -0400
committerJens Axboe <axboe@kernel.dk>2012-09-20 14:31:38 +0200
commite2a60da74fc8215c68509a89e9a69c66363153db (patch)
treec23dd6540dc211e2b2583c3e950a7f6977e3f1df /block
parentd41570b7469724005eb78448a69289900f911963 (diff)
downloadlinaro-lsk-e2a60da74fc8215c68509a89e9a69c66363153db.tar.gz
block: Clean up special command handling logic
Remove special-casing of non-rw fs style requests (discard). The nomerge flags are consolidated in blk_types.h, and rq_mergeable() and bio_mergeable() have been modified to use them. bio_is_rw() is used in place of bio_has_data() a few places. This is done to to distinguish true reads and writes from other fs type requests that carry a payload (e.g. write same). Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Acked-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c13
-rw-r--r--block/blk-merge.c22
-rw-r--r--block/blk.h5
-rw-r--r--block/elevator.c6
4 files changed, 11 insertions, 35 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 2d739ca1092..5cc29299f6a 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1657,8 +1657,8 @@ generic_make_request_checks(struct bio *bio)
goto end_io;
}
- if (unlikely(!(bio->bi_rw & REQ_DISCARD) &&
- nr_sectors > queue_max_hw_sectors(q))) {
+ if (likely(bio_is_rw(bio) &&
+ nr_sectors > queue_max_hw_sectors(q))) {
printk(KERN_ERR "bio too big device %s (%u > %u)\n",
bdevname(bio->bi_bdev, b),
bio_sectors(bio),
@@ -1699,8 +1699,7 @@ generic_make_request_checks(struct bio *bio)
if ((bio->bi_rw & REQ_DISCARD) &&
(!blk_queue_discard(q) ||
- ((bio->bi_rw & REQ_SECURE) &&
- !blk_queue_secdiscard(q)))) {
+ ((bio->bi_rw & REQ_SECURE) && !blk_queue_secdiscard(q)))) {
err = -EOPNOTSUPP;
goto end_io;
}
@@ -1818,7 +1817,7 @@ void submit_bio(int rw, struct bio *bio)
* If it's a regular read/write or a barrier with data attached,
* go through the normal accounting stuff before submission.
*/
- if (bio_has_data(bio) && !(rw & REQ_DISCARD)) {
+ if (bio_has_data(bio)) {
if (rw & WRITE) {
count_vm_events(PGPGOUT, count);
} else {
@@ -1864,7 +1863,7 @@ EXPORT_SYMBOL(submit_bio);
*/
int blk_rq_check_limits(struct request_queue *q, struct request *rq)
{
- if (rq->cmd_flags & REQ_DISCARD)
+ if (!rq_mergeable(rq))
return 0;
if (blk_rq_sectors(rq) > queue_max_sectors(q) ||
@@ -2338,7 +2337,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
req->buffer = bio_data(req->bio);
/* update sector only for requests with clear definition of sector */
- if (req->cmd_type == REQ_TYPE_FS || (req->cmd_flags & REQ_DISCARD))
+ if (req->cmd_type == REQ_TYPE_FS)
req->__sector += total_bytes >> 9;
/* mixed attributes always follow the first bio */
diff --git a/block/blk-merge.c b/block/blk-merge.c
index e76279e4116..86710ca408b 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -418,18 +418,6 @@ static int attempt_merge(struct request_queue *q, struct request *req,
return 0;
/*
- * Don't merge file system requests and discard requests
- */
- if ((req->cmd_flags & REQ_DISCARD) != (next->cmd_flags & REQ_DISCARD))
- return 0;
-
- /*
- * Don't merge discard requests and secure discard requests
- */
- if ((req->cmd_flags & REQ_SECURE) != (next->cmd_flags & REQ_SECURE))
- return 0;
-
- /*
* not contiguous
*/
if (blk_rq_pos(req) + blk_rq_sectors(req) != blk_rq_pos(next))
@@ -521,15 +509,7 @@ int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
{
- if (!rq_mergeable(rq))
- return false;
-
- /* don't merge file system requests and discard requests */
- if ((bio->bi_rw & REQ_DISCARD) != (rq->bio->bi_rw & REQ_DISCARD))
- return false;
-
- /* don't merge discard requests and secure discard requests */
- if ((bio->bi_rw & REQ_SECURE) != (rq->bio->bi_rw & REQ_SECURE))
+ if (!rq_mergeable(rq) || !bio_mergeable(bio))
return false;
/* different data direction or already started, don't merge */
diff --git a/block/blk.h b/block/blk.h
index 2a0ea32d249..ca51543b248 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -171,14 +171,13 @@ static inline int queue_congestion_off_threshold(struct request_queue *q)
*
* a) it's attached to a gendisk, and
* b) the queue had IO stats enabled when this request was started, and
- * c) it's a file system request or a discard request
+ * c) it's a file system request
*/
static inline int blk_do_io_stat(struct request *rq)
{
return rq->rq_disk &&
(rq->cmd_flags & REQ_IO_STAT) &&
- (rq->cmd_type == REQ_TYPE_FS ||
- (rq->cmd_flags & REQ_DISCARD));
+ (rq->cmd_type == REQ_TYPE_FS);
}
/*
diff --git a/block/elevator.c b/block/elevator.c
index 6a55d418896..9b1d42b62f2 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -562,8 +562,7 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where)
if (rq->cmd_flags & REQ_SOFTBARRIER) {
/* barriers are scheduling boundary, update end_sector */
- if (rq->cmd_type == REQ_TYPE_FS ||
- (rq->cmd_flags & REQ_DISCARD)) {
+ if (rq->cmd_type == REQ_TYPE_FS) {
q->end_sector = rq_end_sector(rq);
q->boundary_rq = rq;
}
@@ -605,8 +604,7 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where)
if (elv_attempt_insert_merge(q, rq))
break;
case ELEVATOR_INSERT_SORT:
- BUG_ON(rq->cmd_type != REQ_TYPE_FS &&
- !(rq->cmd_flags & REQ_DISCARD));
+ BUG_ON(rq->cmd_type != REQ_TYPE_FS);
rq->cmd_flags |= REQ_SORTED;
q->nr_sorted++;
if (rq_mergeable(rq)) {