linux-kernel - Re: [PATCH 1/1] md: Do only necessary operations when adding device to RO array

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Date:	Mon, 2 Jun 2014 12:34:11 +1000
From:	NeilBrown <neilb@...e.de>
To:	"Baldysiak, Pawel" <pawel.baldysiak@...el.com>
Cc:	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Paszkiewicz, Artur" <artur.paszkiewicz@...el.com>
Subject: Re: [PATCH 1/1] md: Do only necessary operations when adding device
 to RO array

On Fri, 30 May 2014 13:17:14 +0000 "Baldysiak, Pawel"
<pawel.baldysiak@...el.com> wrote:

> Commit 8313b8e57f55b15e5b7f7fc5d1630bbf686a9a97 changed
> way of adding device to read-only array. Used routine
> md_reap_sync_thread() which also trigger finish_reshape(),
> can break reshape process, if it was restarted.

Exactly how can it break?

This is probably fixed by a couple of patches in my for-next branch which I
will be sending to Linus shortly.

NeilBrown


> This part of function should do only necessary operations, that is:
> 1) call ->spare_active
> 2) clear saved_raid_disk if array is no longer degraded
> 
> Signed-off-by: Pawel Baldysiak <pawel.baldysiak@...el.com>
> Reviewed-by: Artur Paszkiewicz <artur.paszkiewicz@...el.com>
> 
> ---
> drivers/md/md.c | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 237b7e0..cf073de2 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -7820,11 +7820,13 @@ void md_check_recovery(struct mddev *mddev)
>                                                 * As we only add devices that are already in-sync,
>                                                 * we can activate the spares immediately.
>                                                 */
> +                                             struct md_rdev *rdev;
>                                                remove_and_add_spares(mddev, NULL);
> -                                              /* There is no thread, but we need to call
> -                                              * ->spare_active and clear saved_raid_disk
> -                                              */
> -                                              md_reap_sync_thread(mddev);
> +                                             mddev->pers->spare_active(mddev);
> +                                             rdev_for_each(rdev, mddev)
> +                                                             if (!mddev->degraded ||
> +                                                                 test_bit(In_sync, &rdev->flags))
> +                                                                             rdev->saved_raid_disk = -1;
>                                                clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
>                                                goto unlock;
>                                }
> --
> 1.9.0


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