[PATCH v2 1/6] blk-mq: export blk_mq_freeze_queue and blk_mq_unfreeze_queue

2014-08-30 Thread Ming Lei 
It is handy to use the two helpers for switching backend file
in loop driver, so export them.

Signed-off-by: Ming Lei 
---
 block/blk-mq.c |4 +++-
 block/blk-mq.h |1 -
 include/linux/blk-mq.h |2 ++
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4aac826..3ad7524 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -124,8 +124,9 @@ void blk_mq_freeze_queue(struct request_queue *q)
}
wait_event(q->mq_freeze_wq, percpu_ref_is_zero(>mq_usage_counter));
 }
+EXPORT_SYMBOL(blk_mq_freeze_queue);
 
-static void blk_mq_unfreeze_queue(struct request_queue *q)
+void blk_mq_unfreeze_queue(struct request_queue *q)
 {
bool wake;
 
@@ -138,6 +139,7 @@ static void blk_mq_unfreeze_queue(struct request_queue *q)
wake_up_all(>mq_freeze_wq);
}
 }
+EXPORT_SYMBOL(blk_mq_unfreeze_queue);
 
 bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx)
 {
diff --git a/block/blk-mq.h b/block/blk-mq.h
index ca4964a..3800316 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -28,7 +28,6 @@ struct blk_mq_ctx {
 void __blk_mq_complete_request(struct request *rq);
 void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
 void blk_mq_init_flush(struct request_queue *q);
-void blk_mq_freeze_queue(struct request_queue *q);
 void blk_mq_free_queue(struct request_queue *q);
 void blk_mq_clone_flush_request(struct request *flush_rq,
struct request *orig_rq);
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index a1e31f2..c6b2bfa 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -174,6 +174,8 @@ void blk_mq_start_hw_queues(struct request_queue *q);
 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_tags *tags, void (*fn)(void *data, 
unsigned long *), void *data);
+void blk_mq_freeze_queue(struct request_queue *q);
+void blk_mq_unfreeze_queue(struct request_queue *q);
 
 /*
  * Driver command data is immediately after the request. So subtract request
-- 
1.7.9.5

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[PATCH v2 1/6] blk-mq: export blk_mq_freeze_queue and blk_mq_unfreeze_queue

2014-08-30 Thread Ming Lei 
It is handy to use the two helpers for switching backend file
in loop driver, so export them.

Signed-off-by: Ming Lei ming@canonical.com
---
 block/blk-mq.c |4 +++-
 block/blk-mq.h |1 -
 include/linux/blk-mq.h |2 ++
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4aac826..3ad7524 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -124,8 +124,9 @@ void blk_mq_freeze_queue(struct request_queue *q)
}
wait_event(q-mq_freeze_wq, percpu_ref_is_zero(q-mq_usage_counter));
 }
+EXPORT_SYMBOL(blk_mq_freeze_queue);
 
-static void blk_mq_unfreeze_queue(struct request_queue *q)
+void blk_mq_unfreeze_queue(struct request_queue *q)
 {
bool wake;
 
@@ -138,6 +139,7 @@ static void blk_mq_unfreeze_queue(struct request_queue *q)
wake_up_all(q-mq_freeze_wq);
}
 }
+EXPORT_SYMBOL(blk_mq_unfreeze_queue);
 
 bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx)
 {
diff --git a/block/blk-mq.h b/block/blk-mq.h
index ca4964a..3800316 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -28,7 +28,6 @@ struct blk_mq_ctx {
 void __blk_mq_complete_request(struct request *rq);
 void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
 void blk_mq_init_flush(struct request_queue *q);
-void blk_mq_freeze_queue(struct request_queue *q);
 void blk_mq_free_queue(struct request_queue *q);
 void blk_mq_clone_flush_request(struct request *flush_rq,
struct request *orig_rq);
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index a1e31f2..c6b2bfa 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -174,6 +174,8 @@ void blk_mq_start_hw_queues(struct request_queue *q);
 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_tags *tags, void (*fn)(void *data, 
unsigned long *), void *data);
+void blk_mq_freeze_queue(struct request_queue *q);
+void blk_mq_unfreeze_queue(struct request_queue *q);
 
 /*
  * Driver command data is immediately after the request. So subtract request
-- 
1.7.9.5

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