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dm rq: add DM_MAPIO_DELAY_REQUEUE to delay requeue of blk-mq requests

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Otherwise blk-mq will immediately dispatch requests that are requeued
via a BLK_MQ_RQ_QUEUE_BUSY return from blk_mq_ops .queue_rq.

Delayed requeue is implemented using blk_mq_delay_kick_requeue_list()
with a delay of 5 secs.  In the context of DM multipath (all paths down)
it doesn't make any sense to requeue more quickly.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer
2016-09-09 19:24:57 -04:00
parent 9f4c3f874a
commit a8ac51e4ab
2 changed files with 19 additions and 14 deletions
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include/linux/device-mapper.h
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@@ -590,6 +590,7 @@ extern struct ratelimit_state dm_ratelimit_state;
#define DM_MAPIO_SUBMITTED 0
#define DM_MAPIO_REMAPPED 1
#define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE
#define DM_MAPIO_DELAY_REQUEUE 3
#define dm_sector_div64(x, y)( \
{ \