Commit 8acdd0e7 authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe
Browse files

blk-mq: add non_owner variant of start_freeze/unfreeze queue APIs 



Add non_owner variant of start_freeze/unfreeze queue APIs, so that the
caller knows that what they are doing, and we can skip lockdep support
for non_owner variant in per-call level.

Prepare for supporting lockdep for freezing/unfreezing queue.

Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Suggested-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20241025003722.3630252-2-ming.lei@redhat.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent e203e20a

block/blk-mq.c

+20 −0
Original line number Diff line number Diff line
@@ -196,6 +196,26 @@ void blk_mq_unfreeze_queue(struct request_queue *q) 
}

EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue);



/*

 * non_owner variant of blk_freeze_queue_start

 *

 * Unlike blk_freeze_queue_start, the queue doesn't need to be unfrozen

 * by the same task.  This is fragile and should not be used if at all

 * possible.

 */

void blk_freeze_queue_start_non_owner(struct request_queue *q)

{

	blk_freeze_queue_start(q);

}

EXPORT_SYMBOL_GPL(blk_freeze_queue_start_non_owner);



/* non_owner variant of blk_mq_unfreeze_queue */

void blk_mq_unfreeze_queue_non_owner(struct request_queue *q)

{

	__blk_mq_unfreeze_queue(q, false);

}

EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue_non_owner);



/*

 * FIXME: replace the scsi_internal_device_*block_nowait() calls in the

 * mpt3sas driver such that this function can be removed.

include/linux/blk-mq.h

+2 −0
Original line number Diff line number Diff line
@@ -919,6 +919,8 @@ void blk_freeze_queue_start(struct request_queue *q); 
void blk_mq_freeze_queue_wait(struct request_queue *q);

int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,

				     unsigned long timeout);

void blk_mq_unfreeze_queue_non_owner(struct request_queue *q);

void blk_freeze_queue_start_non_owner(struct request_queue *q);



void blk_mq_map_queues(struct blk_mq_queue_map *qmap);

void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);