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dm io: remove stale comment block for dm_io()

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Commit 7eaceaccab ("block: remove per-queue plugging") dropped
unplug_delay and blk_unplug(). Plus, the current kernel has no
fundamental difference between sync_io() and async_io() except
sync_io() uses sync_io_complete() as the notify.fn and explicitly
calls wait_for_completion_io() to sync. The comment isn't valid
any more.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Barry Song 2022-02-19 06:27:24 +08:00 committed by Mike Snitzer
parent 75274a4bf2
commit a6a4901a5e
1 changed files with 0 additions and 8 deletions
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8
drivers/md/dm-io.c
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@ -525,14 +525,6 @@ static int dp_init(struct dm_io_request *io_req, struct dpages *dp,
return 0;
}
/*
* 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)
{