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authorMartin K. Petersen <martin.petersen@oracle.com>2014-09-26 19:20:06 -0400
committerJens Axboe <axboe@fb.com>2014-09-27 09:14:57 -0600
commit4eaf99beadcefbf126fa05e66fb40fca999e09fd (patch)
treee91203868eb48cdf06dd575e7d3f3569d6b6bfc9 /block
parentaae7df50190a640e51bfe11c93f94741ac82ff0b (diff)
downloadlinux-4eaf99beadcefbf126fa05e66fb40fca999e09fd.tar.bz2
block: Don't merge requests if integrity flags differ
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>
Diffstat (limited to 'block')
-rw-r--r--block/blk-integrity.c36
-rw-r--r--block/blk-merge.c6
2 files changed, 29 insertions, 13 deletions
diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index 1c6ba442cd91..79ffb4855af0 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -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);
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 77881798f793..f71bad35b4cc 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -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 */