[dm-devel] [PATCH] dm io: fix comments to align with on-stack plugging

[dm-devel] [PATCH] dm io: fix comments to align with on-stack plugging

[Xianting Tian]

From: Xianting Tian <xianting.tian@linux.alibaba.com>

Ther is no unplugging timer now, on-stack io plugging is used:
	struct blk_plug plug;

	blk_start_plug(&plug);
	submit_batch_of_io();
	blk_finish_plug(&plug);

So remove the old comments for unplugging timer.

Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
---
 drivers/md/dm-io.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 2d3cda0..7dba193 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -528,11 +528,6 @@ static int dp_init(struct dm_io_request *io_req, struct dpages *dp,
 
 /*
  * New collapsed (a)synchronous interface.
- *
- * If the IO is asynchronous (i.e. it has notify.fn), you must either unplug
- * the queue with blk_unplug() some time later or set REQ_SYNC in
- * io_req->bi_opf. If you fail to do one of these, the IO will be submitted to
- * the disk after q->unplug_delay, which defaults to 3ms in blk-settings.c.
  */
 int dm_io(struct dm_io_request *io_req, unsigned num_regions,
 	  struct dm_io_region *where, unsigned long *sync_error_bits)
-- 
1.8.3.1

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Re: [dm-devel] [PATCH] dm io: fix comments to align with on-stack plugging

[Xianting Tian]

Could I get the comments for the patch?  thanks

在 2021/7/17 下午11:54, Xianting Tian 写道:
> From: Xianting Tian <xianting.tian@linux.alibaba.com>
>
> Ther is no unplugging timer now, on-stack io plugging is used:
> 	struct blk_plug plug;
>
> 	blk_start_plug(&plug);
> 	submit_batch_of_io();
> 	blk_finish_plug(&plug);
>
> So remove the old comments for unplugging timer.
>
> Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
> ---
>   drivers/md/dm-io.c | 5 -----
>   1 file changed, 5 deletions(-)
>
> diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
> index 2d3cda0..7dba193 100644
> --- a/drivers/md/dm-io.c
> +++ b/drivers/md/dm-io.c
> @@ -528,11 +528,6 @@ static int dp_init(struct dm_io_request *io_req, struct dpages *dp,
>   
>   /*
>    * New collapsed (a)synchronous interface.
> - *
> - * If the IO is asynchronous (i.e. it has notify.fn), you must either unplug
> - * the queue with blk_unplug() some time later or set REQ_SYNC in
> - * io_req->bi_opf. If you fail to do one of these, the IO will be submitted to
> - * the disk after q->unplug_delay, which defaults to 3ms in blk-settings.c.
>    */
>   int dm_io(struct dm_io_request *io_req, unsigned num_regions,
>   	  struct dm_io_region *where, unsigned long *sync_error_bits)

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