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block: Don't merge requests if integrity flags differ

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We'd occasionally merge requests with conflicting integrity flags.
Introduce a merge helper which checks that the requests have compatible
integrity payloads.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Martin K. Petersen 2014-09-26 19:20:06 -04:00 • committed by Jens Axboe
parent aae7df5019
commit 4eaf99bead
3 changed files with 39 additions and 23 deletions
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20
include/linux/blkdev.h
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@ -1497,10 +1497,10 @@ extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
struct scatterlist *);
extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
extern int blk_integrity_merge_rq(struct request_queue *, struct request *,
struct request *);
extern int blk_integrity_merge_bio(struct request_queue *, struct request *,
struct bio *);
extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
struct request *);
extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
struct bio *);
static inline
struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
@ -1580,15 +1580,15 @@ static inline unsigned short queue_max_integrity_segments(struct request_queue *
{
return 0;
}
static inline int blk_integrity_merge_rq(struct request_queue *rq,
struct request *r1,
struct request *r2)
static inline bool blk_integrity_merge_rq(struct request_queue *rq,
struct request *r1,
struct request *r2)
{
return 0;
}
static inline int blk_integrity_merge_bio(struct request_queue *rq,
struct request *r,
struct bio *b)
static inline bool blk_integrity_merge_bio(struct request_queue *rq,
struct request *r,
struct bio *b)
{
return 0;
}