md: fix 'degraded' calculation when starting a reshape.

This code was written long ago when it was not possible to
reshape a degraded array.  Now it is so the current level of
degraded-ness needs to be taken in to account.  Also newly addded
devices should only reduce degradedness if they are deemed to be
in-sync.

In particular, if you convert a RAID5 to a RAID6, and increase the
number of devices at the same time, then the 5->6 conversion will
make the array degraded so the current code will produce a wrong
value for 'degraded' - "-1" to be precise.

If the reshape runs to completion end_reshape will calculate a correct
new value for 'degraded', but if a device fails during the reshape an
incorrect decision might be made based on the incorrect value of
"degraded".

This patch is suitable for 2.6.32-stable and if they are still open,
2.6.31-stable and 2.6.30-stable as well.

Cc: stable@kernel.org
Reported-by: Michael Evans <mjevans1983@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index e84204eb12d..b5629c3e14f 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5464,11 +5464,11 @@ static int raid5_start_reshape(mddev_t *mddev)
                     !test_bit(Faulty, &rdev->flags)) {
                         if (raid5_add_disk(mddev, rdev) == 0) {
                                 char nm[20];
-                                if (rdev->raid_disk >= conf->previous_raid_disks)
+                                if (rdev->raid_disk >= conf->previous_raid_disks) {
                                         set_bit(In_sync, &rdev->flags);
-                                else
+                                        added_devices++;
+                                } else
                                         rdev->recovery_offset = 0;
-                                added_devices++;
                                 sprintf(nm, "rd%d", rdev->raid_disk);
                                 if (sysfs_create_link(&mddev->kobj,
                                                       &rdev->kobj, nm))
@@ -5480,9 +5480,12 @@ static int raid5_start_reshape(mddev_t *mddev)
                                 break;
                 }
 
+        /* When a reshape changes the number of devices, ->degraded
+         * is measured against the large of the pre and post number of
+         * devices.*/
         if (mddev->delta_disks > 0) {
                 spin_lock_irqsave(&conf->device_lock, flags);
-                mddev->degraded = (conf->raid_disks - conf->previous_raid_disks)
+                mddev->degraded += (conf->raid_disks - conf->previous_raid_disks)
                         - added_devices;
                 spin_unlock_irqrestore(&conf->device_lock, flags);
         }