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Commit e4e73913 authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe
Browse files

blk-mq: introduce blk_mq_unquiesce_queue 



blk_mq_start_stopped_hw_queues() is used implictly
as counterpart of blk_mq_quiesce_queue() for unquiescing queue,
so we introduce blk_mq_unquiesce_queue() and make it
as counterpart of blk_mq_quiesce_queue() explicitly.

This function is for improving the current quiescing mechanism
in the following patches.

Reviewed-by: default avatarBart Van Assche <Bart.VanAssche@sandisk.com>
Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 4f084b41

block/blk-mq.c

+13 −0
Original line number Diff line number Diff line
@@ -181,6 +181,19 @@ void blk_mq_quiesce_queue(struct request_queue *q) 
}

EXPORT_SYMBOL_GPL(blk_mq_quiesce_queue);



/*

 * blk_mq_unquiesce_queue() - counterpart of blk_mq_quiesce_queue()

 * @q: request queue.

 *

 * This function recovers queue into the state before quiescing

 * which is done by blk_mq_quiesce_queue.

 */

void blk_mq_unquiesce_queue(struct request_queue *q)

{

	blk_mq_start_stopped_hw_queues(q, true);

}

EXPORT_SYMBOL_GPL(blk_mq_unquiesce_queue);



void blk_mq_wake_waiters(struct request_queue *q)

{

	struct blk_mq_hw_ctx *hctx;

include/linux/blk-mq.h

+1 −0
Original line number Diff line number Diff line
@@ -245,6 +245,7 @@ void blk_mq_start_hw_queues(struct request_queue *q); 
void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);

void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);

void blk_mq_quiesce_queue(struct request_queue *q);

void blk_mq_unquiesce_queue(struct request_queue *q);

void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);

void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);

void blk_mq_run_hw_queues(struct request_queue *q, bool async);