MD RAID1: Further conditionalize 'fullsync'

A RAID1 device does not necessarily need a fullsync if the bitmap can be used instead.

Similar to commit d6b212f4b19da5301e6b6eca562e5c7a2a6e8c8d in raid5.c, if a raid1
device can be brought back (i.e. from a transient failure) it shouldn't need a
complete resync.  Provided the bitmap is not to old, it will have recorded the areas
of the disk that need recovery.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 8e717bd518e7..835de7168cd3 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2600,7 +2600,8 @@ static struct r1conf *setup_conf(struct mddev *mddev)
                 if (!disk->rdev ||
                     !test_bit(In_sync, &disk->rdev->flags)) {
                         disk->head_position = 0;
-                        if (disk->rdev)
+                        if (disk->rdev &&
+                            (disk->rdev->saved_raid_disk < 0))
                                 conf->fullsync = 1;
                 } else if (conf->last_used < 0)
                         /*