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blk-mq: introduce blk_mq_delay_kick_requeue_list()

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blk_mq_delay_kick_requeue_list() provides the ability to kick the
q->requeue_list after a specified time.  To do this the request_queue's
'requeue_work' member was changed to a delayed_work.

blk_mq_delay_kick_requeue_list() allows DM to defer processing requeued
requests while it doesn't make sense to immediately requeue them
(e.g. when all paths in a DM multipath have failed).

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Mike Snitzer
2016-09-14 13:28:30 -04:00
committed by Jens Axboe
parent c5c5ca7774
commit 2849450ad3
3 changed files with 14 additions and 5 deletions
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include/linux/blkdev.h
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@@ -449,7 +449,7 @@ struct request_queue {
struct list_head requeue_list;
spinlock_t requeue_lock;
struct work_struct requeue_work;
struct delayed_work requeue_work;
struct mutex sysfs_lock;