On Wednesday, October 16, 2013 5:50 AM NeilBrown <neilb@xxxxxxx> wrote:
> On Mon, 07 Oct 2013 16:25:51 +0200 Lukasz Dorau <lukasz.dorau@xxxxxxxxx>
> 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@xxxxxxxxxxxxxxx
> > Signed-off-by: Pawel Baldysiak <pawel.baldysiak@xxxxxxxxx>
> > Signed-off-by: Lukasz Dorau <lukasz.dorau@xxxxxxxxx>
> > ---
> > 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
Thanks!
Lukasz
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