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>

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index e84204eb12dff9c87daaf8ecbdba4462eda8971f..b5629c3e14fad7583d2bc8ace875c9adaf8c2bd6 100644 (file)
--- 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);
        }