linux-kernel - Re: [PATCH] md: Fix skipping recovery for read-only arrays.

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Date:	Wed, 16 Oct 2013 14:49:54 +1100
From:	NeilBrown <neilb@...e.de>
To:	Lukasz Dorau <lukasz.dorau@...el.com>
Cc:	linux-raid@...r.kernel.org, pawel.baldysiak@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] md: Fix skipping recovery for read-only arrays.

On Mon, 07 Oct 2013 16:25:51 +0200 Lukasz Dorau <lukasz.dorau@...el.com>
wrote:

> Since:
>         commit 7ceb17e87bde79d285a8b988cfed9eaeebe60b86
>         md: Allow devices to be re-added to a read-only array.
> 
> spares are activated on a read-only array. In case of raid1 and raid10
> personalities it causes that not-in-sync devices are marked in-sync
> without checking if recovery has been finished.
> 
> If a read-only array is degraded and one of its devices is not in-sync
> (because the array has been only partially recovered) recovery will be skipped.
> 
> This patch adds checking if recovery has been finished before marking a device
> in-sync for raid1 and raid10 personalities. In case of raid5 personality
> such condition is already present (at raid5.c:6029).
> 
> Bug was introduced in 3.10 and causes data corruption.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Pawel Baldysiak <pawel.baldysiak@...el.com>
> Signed-off-by: Lukasz Dorau <lukasz.dorau@...el.com>
> ---
>  drivers/md/raid1.c  |    1 +
>  drivers/md/raid10.c |    1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index d60412c..aacf6bf 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -1479,6 +1479,7 @@ static int raid1_spare_active(struct mddev *mddev)
>  			}
>  		}
>  		if (rdev
> +		    && rdev->recovery_offset == MaxSector
>  		    && !test_bit(Faulty, &rdev->flags)
>  		    && !test_and_set_bit(In_sync, &rdev->flags)) {
>  			count++;
> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
> index df7b0a0..73dc8a3 100644
> --- a/drivers/md/raid10.c
> +++ b/drivers/md/raid10.c
> @@ -1782,6 +1782,7 @@ static int raid10_spare_active(struct mddev *mddev)
>  			}
>  			sysfs_notify_dirent_safe(tmp->replacement->sysfs_state);
>  		} else if (tmp->rdev
> +			   && tmp->rdev->recovery_offset == MaxSector
>  			   && !test_bit(Faulty, &tmp->rdev->flags)
>  			   && !test_and_set_bit(In_sync, &tmp->rdev->flags)) {
>  			count++;

Applied - thanks.

I'll forward it to Linus and -stable shortly.

NeilBrown

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