dm: improve BLK_STS_DM_REQUEUE and BLK_STS_AGAIN handling

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If either BLK_STS_DM_REQUEUE or BLK_STS_AGAIN is returned for POLLED
io, we requeue the original bio into deferred list and kick md->wq to
re-submit it to block layer.

Improve the handling in the following way:

1) Factor out dm_handle_requeue() for handling dm_io requeue.

2) Unify handling for BLK_STS_DM_REQUEUE and BLK_STS_AGAIN: clear
   REQ_POLLED for BLK_STS_DM_REQUEUE too, for the sake of simplicity,
   given BLK_STS_DM_REQUEUE is very unusual.

3) Queue md->wq explicitly in dm_handle_requeue(), so requeue handling
   becomes more robust.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

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This commit is contained in:

Ming Lei 2022-06-24 22:12:53 +08:00 • committed by Mike Snitzer

parent e810cb78bc

commit 444fe04f7a

1 changed files with 45 additions and 25 deletions

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drivers/md/dm.c

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