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

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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: Christoph Hellwig <hch@lst.de>
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20241025003722.3630252-2-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2024-10-25 08:37:18 +08:00 committed by Jens Axboe
parent e203e20a8b
commit 8acdd0e7bf
2 changed files with 22 additions and 0 deletions
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20
block/blk-mq.c
View File

@ -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.

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

@ -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);