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@xxxxxxxxxx>
---
block/blk-mq.c | 16 ++++++++++++----
include/linux/blk-mq.h | 1 +
include/linux/blkdev.h | 2 +-
3 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 13f5a6c..844c2f3 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -501,7 +501,7 @@ EXPORT_SYMBOL(blk_mq_requeue_request);
static void blk_mq_requeue_work(struct work_struct *work)
{
struct request_queue *q =
- container_of(work, struct request_queue, requeue_work);
+ container_of(work, struct request_queue, requeue_work.work);
LIST_HEAD(rq_list);
struct request *rq, *next;
unsigned long flags;
@@ -556,16 +556,24 @@ EXPORT_SYMBOL(blk_mq_add_to_requeue_list);
void blk_mq_cancel_requeue_work(struct request_queue *q)
{
- cancel_work_sync(&q->requeue_work);
+ cancel_delayed_work_sync(&q->requeue_work);
}
EXPORT_SYMBOL_GPL(blk_mq_cancel_requeue_work);
void blk_mq_kick_requeue_list(struct request_queue *q)
{
- kblockd_schedule_work(&q->requeue_work);
+ kblockd_schedule_delayed_work(&q->requeue_work, 0);
}
EXPORT_SYMBOL(blk_mq_kick_requeue_list);
+void blk_mq_delay_kick_requeue_list(struct request_queue *q,
+ unsigned long msecs)
+{
+ kblockd_schedule_delayed_work(&q->requeue_work,
+ msecs_to_jiffies(msecs));
+}
+EXPORT_SYMBOL(blk_mq_delay_kick_requeue_list);
+
void blk_mq_abort_requeue_list(struct request_queue *q)
{
unsigned long flags;
@@ -2082,7 +2090,7 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
q->sg_reserved_size = INT_MAX;
- INIT_WORK(&q->requeue_work, blk_mq_requeue_work);
+ INIT_DELAYED_WORK(&q->requeue_work, blk_mq_requeue_work);
INIT_LIST_HEAD(&q->requeue_list);
spin_lock_init(&q->requeue_lock);
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index e43bbff..ecec4b8 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -232,6 +232,7 @@ void blk_mq_requeue_request(struct request *rq);
void blk_mq_add_to_requeue_list(struct request *rq, bool at_head);
void blk_mq_cancel_requeue_work(struct request_queue *q);
void blk_mq_kick_requeue_list(struct request_queue *q);
+void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
void blk_mq_abort_requeue_list(struct request_queue *q);
void blk_mq_complete_request(struct request *rq, int error);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e79055c..b0a6189 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -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;
--
2.7.4 (Apple Git-66)
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