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Commit 7f39add3 authored by Sagi Grimberg's avatar Sagi Grimberg Committed by Jens Axboe
Browse files

block: Refuse request/bio merges with gaps in the integrity payload 



If a driver sets the block queue virtual boundary mask, it means that
it cannot handle gaps so we must not allow those in the integrity
payload as well.

Signed-off-by: default avatarSagi Grimberg <sagig@mellanox.com>

Fixed up by me to have duplicate integrity merge functions, depending
on whether block integrity is enabled or not. Fixes a compilations
issue with CONFIG_BLK_DEV_INTEGRITY unset.

Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 5e7c4274

block/blk-integrity.c

+3 −0
Original line number Diff line number Diff line
@@ -204,6 +204,9 @@ bool blk_integrity_merge_rq(struct request_queue *q, struct request *req, 
	    q->limits.max_integrity_segments)

		return false;



	if (integrity_req_gap_back_merge(req, next->bio))

		return false;



	return true;

}

EXPORT_SYMBOL(blk_integrity_merge_rq);

block/blk-merge.c

+6 −0
Original line number Diff line number Diff line
@@ -440,6 +440,9 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req, 
{

	if (req_gap_back_merge(req, bio))

		return 0;

	if (blk_integrity_rq(req) &&

	    integrity_req_gap_back_merge(req, bio))

		return 0;

	if (blk_rq_sectors(req) + bio_sectors(bio) >

	    blk_rq_get_max_sectors(req)) {

		req->cmd_flags |= REQ_NOMERGE;
@@ -461,6 +464,9 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req, 


	if (req_gap_front_merge(req, bio))

		return 0;

	if (blk_integrity_rq(req) &&

	    integrity_req_gap_front_merge(req, bio))

		return 0;

	if (blk_rq_sectors(req) + bio_sectors(bio) >

	    blk_rq_get_max_sectors(req)) {

		req->cmd_flags |= REQ_NOMERGE;

include/linux/blkdev.h

+30 −0
Original line number Diff line number Diff line
@@ -1514,6 +1514,26 @@ queue_max_integrity_segments(struct request_queue *q) 
	return q->limits.max_integrity_segments;

}



static inline bool integrity_req_gap_back_merge(struct request *req,

						struct bio *next)

{

	struct bio_integrity_payload *bip = bio_integrity(req->bio);

	struct bio_integrity_payload *bip_next = bio_integrity(next);



	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],

				bip_next->bip_vec[0].bv_offset);

}



static inline bool integrity_req_gap_front_merge(struct request *req,

						 struct bio *bio)

{

	struct bio_integrity_payload *bip = bio_integrity(bio);

	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);



	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],

				bip_next->bip_vec[0].bv_offset);

}



#else /* CONFIG_BLK_DEV_INTEGRITY */



struct bio;
@@ -1580,6 +1600,16 @@ static inline bool blk_integrity_is_initialized(struct gendisk *g) 
{

	return 0;

}

static inline bool integrity_req_gap_back_merge(struct request *req,

						struct bio *next)

{

	return false;

}

static inline bool integrity_req_gap_front_merge(struct request *req,

						 struct bio *bio)

{

	return false;

}



#endif /* CONFIG_BLK_DEV_INTEGRITY */