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

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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: Sagi 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: Jens Axboe <axboe@fb.com>
This commit is contained in:
Sagi Grimberg
2015-09-11 09:03:04 -06:00
committed by Jens Axboe
parent 5e7c4274a7
commit 7f39add3b0
3 changed files with 39 additions and 0 deletions
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6
block/blk-merge.c
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@@ -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;