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blk-mq: Export freeze/unfreeze functions 

Let drivers prevent entering a queue that isn't available.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2014-12-19 17:54:14 -07:00 committed by Jens Axboe
parent c76541a932
commit b4c6a02877
2 changed files with 6 additions and 2 deletions
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6
block/blk-mq.c
View File

@ -107,7 +107,7 @@ static void blk_mq_usage_counter_release(struct percpu_ref *ref)
wake_up_all(&q->mq_freeze_wq);
}
static void blk_mq_freeze_queue_start(struct request_queue *q)
void blk_mq_freeze_queue_start(struct request_queue *q)
{
bool freeze;
@ -120,6 +120,7 @@ static void blk_mq_freeze_queue_start(struct request_queue *q)
blk_mq_run_queues(q, false);
}
}
EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_start);
static void blk_mq_freeze_queue_wait(struct request_queue *q)
{
@ -136,7 +137,7 @@ void blk_mq_freeze_queue(struct request_queue *q)
blk_mq_freeze_queue_wait(q);
}
static void blk_mq_unfreeze_queue(struct request_queue *q)
void blk_mq_unfreeze_queue(struct request_queue *q)
{
bool wake;
@ -149,6 +150,7 @@ static void blk_mq_unfreeze_queue(struct request_queue *q)
wake_up_all(&q->mq_freeze_wq);
}
}
EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue);
bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx)
{

2
include/linux/blk-mq.h
View File

@ -212,6 +212,8 @@ void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
void blk_mq_tag_busy_iter(struct blk_mq_hw_ctx *hctx, busy_iter_fn *fn,
void *priv);
void blk_mq_unfreeze_queue(struct request_queue *q);
void blk_mq_freeze_queue_start(struct request_queue *q);
/*
* Driver command data is immediately after the request. So subtract request