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| author | Mike Snitzer <snitzer@redhat.com> | 2016-09-10 02:24:57 +0300 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2016-09-14 20:56:38 +0300 |
| commit | a8ac51e4ab97765838ae6a07d6ff7f7bfaaa0ea3 (patch) | |
| tree | 1bc9e863ee44b4991b9c467659503f681bb4398e /include/linux/device-mapper.h | |
| parent | 9f4c3f874a3ab8fb845dd2f04f4396ebc5c1f225 (diff) | |
| download | linux-a8ac51e4ab97765838ae6a07d6ff7f7bfaaa0ea3.tar.xz | |
dm rq: add DM_MAPIO_DELAY_REQUEUE to delay requeue of blk-mq requests
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>
Diffstat (limited to 'include/linux/device-mapper.h')
| -rw-r--r-- | include/linux/device-mapper.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 91acfce74a22..ef7962e84444 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -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)( \ { \ |