tree 0cf0ae9320ea9ebbb6bd1403659591cf399c16a1
parent 9c81075f436f867f580c2edf2350c0898cffc9d0
author Jonathan Brassow <jbrassow@redhat.com> 1307574028 -0500
committer NeilBrown <neilb@suse.de> 1307583749 +1000

MD: raid5 do not set fullsync

Add check to determine if a device needs full resync or if partial resync will do

RAID 5 was assuming that if a device was not In_sync, it must undergo a full
resync.  We add a check to see if 'saved_raid_disk' is the same as 'raid_disk'.
If it is, we can safely skip the full resync and rely on the bitmap for
partial recovery instead.  This is the legitimate purpose of 'saved_raid_disk',
from md.h:
int saved_raid_disk;            /* role that device used to have in the
                                 * array and could again if we did a partial
                                 * resync from the bitmap
                                 */

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>