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block: return ELEVATOR_DISCARD_MERGE if possible

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commit 866663b7b52d2da267b28e12eed89ee781b8fed1 upstream.

When merging one bio to request, if they are discard IO and the queue
supports multi-range discard, we need to return ELEVATOR_DISCARD_MERGE
because both block core and related drivers(nvme, virtio-blk) doesn't
handle mixed discard io merge(traditional IO merge together with
discard merge) well.

Fix the issue by returning ELEVATOR_DISCARD_MERGE in this situation,
so both blk-mq and drivers just need to handle multi-range discard.

Reported-by: Oleksandr Natalenko <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Tested-by: Oleksandr Natalenko <[email protected]>
Fixes: 2705dfb20947 ("block: fix discard request merge")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Gwendal Grignou <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Ming Lei 2021-07-29 11:42:26 +08:00 • committed by Greg Kroah-Hartman
commit 9ea8e6a832
5 changed files with 24 additions and 15 deletions
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15
block/blk-merge.c
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@ -721,21 +721,6 @@ static void blk_account_io_merge(struct request *req)
part_stat_unlock();
}
}
/*
* Two cases of handling DISCARD merge:
* If max_discard_segments > 1, the driver takes every bio
* as a range and send them to controller together. The ranges
* needn't to be contiguous.
* Otherwise, the bios/requests will be handled as same as
* others which should be contiguous.
*/
static inline bool blk_discard_mergable(struct request *req)
{
if (req_op(req) == REQ_OP_DISCARD &&
queue_max_discard_segments(req->q) > 1)
return true;
return false;
}
static enum elv_merge blk_try_req_merge(struct request *req,
struct request *next)