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Message-ID: <57ec6c2d-f5bb-10fc-39e8-097704daa96c@huaweicloud.com>
Date: Wed, 31 Jan 2024 10:51:38 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Yu Kuai <yukuai1@...weicloud.com>, mpatocka@...hat.com,
heinzm@...hat.com, xni@...hat.com, agk@...hat.com, snitzer@...nel.org,
dm-devel@...ts.linux.dev, song@...nel.org, jbrassow@....redhat.com,
neilb@...e.de, shli@...com, akpm@...l.org
Cc: linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
yi.zhang@...wei.com, yangerkun@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH v4 RFC 14/14] dm-raid: remove mddev_suspend/resume()
Hi,
在 2024/01/30 10:18, Yu Kuai 写道:
> From: Yu Kuai <yukuai3@...wei.com>
>
> dm_suspend() already make sure that no new IO can be issued and will
> wait for all dispatched IO to be done. There is no need to call
> mddev_suspend() to make sure that again.
>
I'm about to send the final version(I hope), please let me know if
anyone thinks this patch should not be included.
Thanks,
Kuai
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> ---
> drivers/md/dm-raid.c | 8 +++-----
> drivers/md/md.c | 11 +++++++++++
> 2 files changed, 14 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
> index 5f78cc19d6f3..ed8c28952b14 100644
> --- a/drivers/md/dm-raid.c
> +++ b/drivers/md/dm-raid.c
> @@ -3241,7 +3241,7 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
> rs->md.in_sync = 1;
>
> /* Has to be held on running the array */
> - mddev_suspend_and_lock_nointr(&rs->md);
> + mddev_lock_nointr(&rs->md);
>
> /* Keep array frozen until resume. */
> md_frozen_sync_thread(&rs->md);
> @@ -3829,11 +3829,9 @@ static void raid_postsuspend(struct dm_target *ti)
> {
> struct raid_set *rs = ti->private;
>
> - if (!test_and_set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) {
> + if (!test_and_set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags))
> /* Writes have to be stopped before suspending to avoid deadlocks. */
> md_stop_writes(&rs->md);
> - mddev_suspend(&rs->md, false);
> - }
> }
>
> static void attempt_restore_of_faulty_devices(struct raid_set *rs)
> @@ -4091,7 +4089,7 @@ static void raid_resume(struct dm_target *ti)
> mddev->ro = 0;
> mddev->in_sync = 0;
> md_unfrozen_sync_thread(mddev);
> - mddev_unlock_and_resume(mddev);
> + mddev_unlock(mddev);
> }
> }
>
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 093abf3ce27b..e3a56a958b47 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -437,6 +437,10 @@ int mddev_suspend(struct mddev *mddev, bool interruptible)
> {
> int err = 0;
>
> + /* Array is supended from dm_suspend() for dm-raid. */
> + if (!mddev->gendisk)
> + return 0;
> +
> /*
> * hold reconfig_mutex to wait for normal io will deadlock, because
> * other context can't update super_block, and normal io can rely on
> @@ -488,6 +492,13 @@ EXPORT_SYMBOL_GPL(mddev_suspend);
>
> static void __mddev_resume(struct mddev *mddev, bool recovery_needed)
> {
> + /*
> + * Array is supended from dm_suspend() and resumed from dm_resume() for
> + * dm-raid.
> + */
> + if (!mddev->gendisk)
> + return;
> +
> lockdep_assert_not_held(&mddev->reconfig_mutex);
>
> mutex_lock(&mddev->suspend_mutex);
>
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