tree 271ff9fe2a1616b45b24457e37b7088c4fd2923c
parent fdcfbbb653b27964c4daa4d2bcb364259c257e7d
author NeilBrown <neilb@suse.de> 1372920113 +1000
committer NeilBrown <neilb@suse.de> 1372920177 +1000

md/raid10: fix bug which causes all RAID10 reshapes to move no data.

The recent comment:
commit 7e83ccbecd608b971f340e951c9e84cd0343002f
    md/raid10: Allow skipping recovery when clean arrays are assembled

Causes raid10 to skip a recovery in certain cases where it is safe to
do so.  Unfortunately it also causes a reshape to be skipped which is
never safe.  The result is that an attempt to reshape a RAID10 will
appear to complete instantly, but no data will have been moves so the
array will now contain garbage.
(If nothing is written, you can recovery by simple performing the
reverse reshape which will also complete instantly).

Bug was introduced in 3.10, so this is suitable for 3.10-stable.

Cc: stable@vger.kernel.org (3.10)
Cc: Martin Wilck <mwilck@arcor.de>
Signed-off-by: NeilBrown <neilb@suse.de>