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dm-raid: add a new helper prepare_suspend() in md_personality

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There are no functional changes for now, prepare to fix a deadlock for
dm-raid456.

Cc: stable@vger.kernel.org # v6.7+
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Xiao Ni <xni@redhat.com>
Acked-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240305072306.2562024-8-yukuai1@huaweicloud.com
This commit is contained in:
Yu Kuai 2024-03-05 15:23:04 +08:00 committed by Song Liu
parent cd32b27a66
commit 5625ff8b72
2 changed files with 19 additions and 0 deletions
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18
drivers/md/dm-raid.c
View File

@ -3803,6 +3803,23 @@ static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
blk_limits_io_opt(limits, chunk_size_bytes * mddev_data_stripes(rs));
}
static void raid_presuspend(struct dm_target *ti)
{
struct raid_set *rs = ti->private;
struct mddev *mddev = &rs->md;
if (!reshape_interrupted(mddev))
return;
/*
* For raid456, if reshape is interrupted, IO across reshape position
* will never make progress, while caller will wait for IO to be done.
* Inform raid456 to handle those IO to prevent deadlock.
*/
if (mddev->pers && mddev->pers->prepare_suspend)
mddev->pers->prepare_suspend(mddev);
}
static void raid_postsuspend(struct dm_target *ti)
{
struct raid_set *rs = ti->private;
@ -4087,6 +4104,7 @@ static struct target_type raid_target = {
.message = raid_message,
.iterate_devices = raid_iterate_devices,
.io_hints = raid_io_hints,
.presuspend = raid_presuspend,
.postsuspend = raid_postsuspend,
.preresume = raid_preresume,
.resume = raid_resume,

1
drivers/md/md.h
View File

@ -659,6 +659,7 @@ struct md_personality
int (*start_reshape) (struct mddev *mddev);
void (*finish_reshape) (struct mddev *mddev);
void (*update_reshape_pos) (struct mddev *mddev);
void (*prepare_suspend) (struct mddev *mddev);
/* quiesce suspends or resumes internal processing.
* 1 - stop new actions and wait for action io to complete
* 0 - return to normal behaviour