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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: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2017-03-27 20:06:57 +08:00 committed by Jens Axboe
parent 5ed61d3f08
commit 1671d522cd
5 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
block/blk-core.c
View File

@ -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

10
block/blk-mq.c
View File

@ -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);

2
drivers/block/mtip32xx/mtip32xx.c
View File

@ -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);

2
drivers/nvme/host/core.c
View File

@ -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);

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

@ -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);