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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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36
block/blk-integrity.c
View File

@ -186,37 +186,53 @@ int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2)
}
EXPORT_SYMBOL(blk_integrity_compare);
int blk_integrity_merge_rq(struct request_queue *q, struct request *req,
struct request *next)
bool blk_integrity_merge_rq(struct request_queue *q, struct request *req,
struct request *next)
{
if (blk_integrity_rq(req) != blk_integrity_rq(next))
return -1;
if (blk_integrity_rq(req) == 0 && blk_integrity_rq(next) == 0)
return true;
if (blk_integrity_rq(req) == 0 || blk_integrity_rq(next) == 0)
return false;
if (bio_integrity(req->bio)->bip_flags !=
bio_integrity(next->bio)->bip_flags)
return false;
if (req->nr_integrity_segments + next->nr_integrity_segments >
q->limits.max_integrity_segments)
return -1;
return false;
return 0;
return true;
}
EXPORT_SYMBOL(blk_integrity_merge_rq);
int blk_integrity_merge_bio(struct request_queue *q, struct request *req,
struct bio *bio)
bool blk_integrity_merge_bio(struct request_queue *q, struct request *req,
struct bio *bio)
{
int nr_integrity_segs;
struct bio *next = bio->bi_next;
if (blk_integrity_rq(req) == 0 && bio_integrity(bio) == NULL)
return true;
if (blk_integrity_rq(req) == 0 || bio_integrity(bio) == NULL)
return false;
if (bio_integrity(req->bio)->bip_flags != bio_integrity(bio)->bip_flags)
return false;
bio->bi_next = NULL;
nr_integrity_segs = blk_rq_count_integrity_sg(q, bio);
bio->bi_next = next;
if (req->nr_integrity_segments + nr_integrity_segs >
q->limits.max_integrity_segments)
return -1;
return false;
req->nr_integrity_segments += nr_integrity_segs;
return 0;
return true;
}
EXPORT_SYMBOL(blk_integrity_merge_bio);

6
block/blk-merge.c
View File

@ -313,7 +313,7 @@ static inline int ll_new_hw_segment(struct request_queue *q,
if (req->nr_phys_segments + nr_phys_segs > queue_max_segments(q))
goto no_merge;
if (bio_integrity(bio) && blk_integrity_merge_bio(q, req, bio))
if (blk_integrity_merge_bio(q, req, bio) == false)
goto no_merge;
/*
@ -410,7 +410,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
if (total_phys_segments > queue_max_segments(q))
return 0;
if (blk_integrity_rq(req) && blk_integrity_merge_rq(q, req, next))
if (blk_integrity_merge_rq(q, req, next) == false)
return 0;
/* Merge is OK... */
@ -590,7 +590,7 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
return false;
/* only merge integrity protected bio into ditto rq */
if (bio_integrity(bio) != blk_integrity_rq(rq))
if (blk_integrity_merge_bio(rq->q, rq, bio) == false)
return false;
/* must be using the same buffer */

20
include/linux/blkdev.h
View File

@ -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;
}