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block: Fix front merge check 

For a front merge, the maximum number of sectors of the
request must be checked against the front merge BIO sector,
not the current sector of the request.

Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Damien Le Moal 2016-07-20 21:40:47 -06:00 committed by Jens Axboe
parent 72ef799b3f
commit 17007f3994
2 changed files with 6 additions and 5 deletions
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6
block/blk-merge.c
View File

@ -500,7 +500,7 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
integrity_req_gap_back_merge(req, bio))
return 0;
if (blk_rq_sectors(req) + bio_sectors(bio) >
blk_rq_get_max_sectors(req)) {
blk_rq_get_max_sectors(req, blk_rq_pos(req))) {
req->cmd_flags |= REQ_NOMERGE;
if (req == q->last_merge)
q->last_merge = NULL;
@ -524,7 +524,7 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
integrity_req_gap_front_merge(req, bio))
return 0;
if (blk_rq_sectors(req) + bio_sectors(bio) >
blk_rq_get_max_sectors(req)) {
blk_rq_get_max_sectors(req, bio->bi_iter.bi_sector)) {
req->cmd_flags |= REQ_NOMERGE;
if (req == q->last_merge)
q->last_merge = NULL;
@ -570,7 +570,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
* Will it become too large?
*/
if ((blk_rq_sectors(req) + blk_rq_sectors(next)) >
blk_rq_get_max_sectors(req))
blk_rq_get_max_sectors(req, blk_rq_pos(req)))
return 0;
total_phys_segments = req->nr_phys_segments + next->nr_phys_segments;

5
include/linux/blkdev.h
View File

@ -922,7 +922,8 @@ static inline unsigned int blk_max_size_offset(struct request_queue *q,
(offset & (q->limits.chunk_sectors - 1));
}
static inline unsigned int blk_rq_get_max_sectors(struct request *rq)
static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
sector_t offset)
{
struct request_queue *q = rq->q;
@ -932,7 +933,7 @@ static inline unsigned int blk_rq_get_max_sectors(struct request *rq)
if (!q->limits.chunk_sectors || (req_op(rq) == REQ_OP_DISCARD))
return blk_queue_get_max_sectors(q, req_op(rq));
return min(blk_max_size_offset(q, blk_rq_pos(rq)),
return min(blk_max_size_offset(q, offset),
blk_queue_get_max_sectors(q, req_op(rq)));
}