Commit 1671d522 authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe
Browse files

block: rename blk_mq_freeze_queue_start() 



As the .q_usage_counter is used by both legacy and
mq path, we need to block new I/O if queue becomes
dead in blk_queue_enter().

So rename it and we can use this function in both
paths.

Reviewed-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarMing Lei <tom.leiming@gmail.com>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 5ed61d3f

block/blk-core.c

+1 −1
Original line number Diff line number Diff line
@@ -670,7 +670,7 @@ int blk_queue_enter(struct request_queue *q, bool nowait) 
			return -EBUSY;



		/*

		 * read pair of barrier in blk_mq_freeze_queue_start(),

		 * read pair of barrier in blk_freeze_queue_start(),

		 * we need to order reading __PERCPU_REF_DEAD flag of

		 * .q_usage_counter and reading .mq_freeze_depth,

		 * otherwise the following wait may never return if the

block/blk-mq.c

+5 −5
Original line number Diff line number Diff line
@@ -68,7 +68,7 @@ static void blk_mq_hctx_clear_pending(struct blk_mq_hw_ctx *hctx, 
	sbitmap_clear_bit(&hctx->ctx_map, ctx->index_hw);

}



void blk_mq_freeze_queue_start(struct request_queue *q)

void blk_freeze_queue_start(struct request_queue *q)

{

	int freeze_depth;
@@ -78,7 +78,7 @@ void blk_mq_freeze_queue_start(struct request_queue *q) 
		blk_mq_run_hw_queues(q, false);

	}

}

EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_start);

EXPORT_SYMBOL_GPL(blk_freeze_queue_start);



void blk_mq_freeze_queue_wait(struct request_queue *q)

{
@@ -108,7 +108,7 @@ void blk_freeze_queue(struct request_queue *q) 
	 * no blk_unfreeze_queue(), and blk_freeze_queue() is not

	 * exported to drivers as the only user for unfreeze is blk_mq.

	 */

	blk_mq_freeze_queue_start(q);

	blk_freeze_queue_start(q);

	blk_mq_freeze_queue_wait(q);

}
@@ -746,7 +746,7 @@ static void blk_mq_timeout_work(struct work_struct *work) 
	 * percpu_ref_tryget directly, because we need to be able to

	 * obtain a reference even in the short window between the queue

	 * starting to freeze, by dropping the first reference in

	 * blk_mq_freeze_queue_start, and the moment the last request is

	 * blk_freeze_queue_start, and the moment the last request is

	 * consumed, marked by the instant q_usage_counter reaches

	 * zero.

	 */
@@ -2376,7 +2376,7 @@ static void blk_mq_queue_reinit_work(void) 
	 * take place in parallel.

	 */

	list_for_each_entry(q, &all_q_list, all_q_node)

		blk_mq_freeze_queue_start(q);

		blk_freeze_queue_start(q);

	list_for_each_entry(q, &all_q_list, all_q_node)

		blk_mq_freeze_queue_wait(q);

drivers/block/mtip32xx/mtip32xx.c

+1 −1
Original line number Diff line number Diff line
@@ -4162,7 +4162,7 @@ static int mtip_block_remove(struct driver_data *dd) 
		dev_info(&dd->pdev->dev, "device %s surprise removal\n",

						dd->disk->disk_name);



	blk_mq_freeze_queue_start(dd->queue);

	blk_freeze_queue_start(dd->queue);

	blk_mq_stop_hw_queues(dd->queue);

	blk_mq_tagset_busy_iter(&dd->tags, mtip_no_dev_cleanup, dd);

drivers/nvme/host/core.c

+1 −1
Original line number Diff line number Diff line
@@ -2386,7 +2386,7 @@ void nvme_start_freeze(struct nvme_ctrl *ctrl) 


	mutex_lock(&ctrl->namespaces_mutex);

	list_for_each_entry(ns, &ctrl->namespaces, list)

		blk_mq_freeze_queue_start(ns->queue);

		blk_freeze_queue_start(ns->queue);

	mutex_unlock(&ctrl->namespaces_mutex);

}

EXPORT_SYMBOL_GPL(nvme_start_freeze);

include/linux/blk-mq.h

+1 −1
Original line number Diff line number Diff line
@@ -243,7 +243,7 @@ void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset, 
		busy_tag_iter_fn *fn, void *priv);

void blk_mq_freeze_queue(struct request_queue *q);

void blk_mq_unfreeze_queue(struct request_queue *q);

void blk_mq_freeze_queue_start(struct request_queue *q);

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);

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