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blk-integrity: properly account for segments

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Both types of merging when integrity data is used are miscounting the
segments:

Merging two requests wasn't accounting for the new segment count, so add
the "next" segment count to the first on a successful merge to ensure
this value is accurate.

Merging a bio into an existing request was double counting the bio's
segments, even if the merge failed later on. Move the segment accounting
to the end when the merge is successful.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20240913182854.2445457-4-kbusch@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2024-09-13 11:28:48 -07:00 committed by Jens Axboe
parent 9c297eced5
commit d148d75034
2 changed files with 4 additions and 2 deletions
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2
block/blk-integrity.c
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@ -153,8 +153,6 @@ bool blk_integrity_merge_bio(struct request_queue *q, struct request *req,
q->limits.max_integrity_segments)
return false;
req->nr_integrity_segments += nr_integrity_segs;
return true;
}

4
block/blk-merge.c
View File

@ -639,6 +639,9 @@ static inline int ll_new_hw_segment(struct request *req, struct bio *bio,
* counters.
*/
req->nr_phys_segments += nr_phys_segs;
if (bio_integrity(bio))
req->nr_integrity_segments += blk_rq_count_integrity_sg(req->q,
bio);
return 1;
no_merge:
@ -731,6 +734,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
/* Merge is OK... */
req->nr_phys_segments = total_phys_segments;
req->nr_integrity_segments += next->nr_integrity_segments;
return 1;
}