diff mbox

[v2,3/4] block: rename blk_mq_freeze_queue_start()

Message ID 20170324123621.5227-4-tom.leiming@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ming Lei March 24, 2017, 12:36 p.m. UTC
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
pathes.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
 block/blk-core.c                  |  2 +-
 block/blk-mq.c                    | 10 +++++-----
 drivers/block/mtip32xx/mtip32xx.c |  2 +-
 drivers/nvme/host/core.c          |  2 +-
 include/linux/blk-mq.h            |  2 +-
 5 files changed, 9 insertions(+), 9 deletions(-)

Comments

Hannes Reinecke March 24, 2017, 3:20 p.m. UTC | #1
On 03/24/2017 01:36 PM, Ming Lei wrote:
> 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
> pathes.
> 
> Signed-off-by: Ming Lei <tom.leiming@gmail.com>
> ---
>  block/blk-core.c                  |  2 +-
>  block/blk-mq.c                    | 10 +++++-----
>  drivers/block/mtip32xx/mtip32xx.c |  2 +-
>  drivers/nvme/host/core.c          |  2 +-
>  include/linux/blk-mq.h            |  2 +-
>  5 files changed, 9 insertions(+), 9 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@suse.com>

Cheers,

Hannes
Bart Van Assche March 24, 2017, 5:29 p.m. UTC | #2
On Fri, 2017-03-24 at 20:36 +0800, Ming Lei wrote:
> 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
> pathes.

Should "pathes" be changed into "paths" in the commit message? Additionally,
this patch breaks the symmetry the comment in blk_mq_freeze_queue() refers
to. Anyway:

Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Ming Lei March 24, 2017, 5:52 p.m. UTC | #3
On Sat, Mar 25, 2017 at 1:29 AM, Bart Van Assche
<Bart.VanAssche@sandisk.com> wrote:
> On Fri, 2017-03-24 at 20:36 +0800, Ming Lei wrote:
>> 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
>> pathes.
>
> Should "pathes" be changed into "paths" in the commit message? Additionally,
> this patch breaks the symmetry the comment in blk_mq_freeze_queue() refers
> to. Anyway:

Really? Is there one function named as blk_mq_freeze_queue_end()?

The comment means blk_mq_freeze_queue() vs. blk_mq_unfreeze_queue(), which can't
be affected by this patch.


Thanks,
Ming Lei
diff mbox

Patch

diff --git a/block/blk-core.c b/block/blk-core.c
index 44eed17319c0..5901133d105f 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -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 DEAD flag of .q_usage_counter
 		 * and reading .mq_freeze_depth, otherwise the following
 		 * wait may never return if the two read are reordered.
diff --git a/block/blk-mq.c b/block/blk-mq.c
index b36f0481ba0e..5370b4f750ff 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -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);
 
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index f96ab717534c..c96c35ab39df 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -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);
 
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 9b3b57fef446..4a6d7f408769 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -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);
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 5b3e201c8d4f..ea2e9dcd3aef 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -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);