md: don't clear endpoint for resync when resync is interrupted.

If a 'sync_max' has been set (via sysfs), it is wrong to clear it
until a resync (or reshape or recovery ...) actually reached that
point.
So if a resync is interrupted (e.g. by device failure),
leave 'resync_max' unchanged.

This is particularly important for 'reshape' operations that do not
change the size of the array.  For such operations mdadm needs to
monitor the reshape taking rolling backups of the section being
reshaped.  If resync_max gets cleared, the reshape can get ahead of
mdadm and then the backups that mdadm creates are useless.

This is suitable for 2.6.31.y stable kernels.
Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 10eb1fce975e9bde28f3331f5b9800ca8d1130ca..e64c971038d14a4ddc588876d010e5b748b05d8f 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6504,8 +6504,9 @@ void md_do_sync(mddev_t *mddev)
  skip:
        mddev->curr_resync = 0;
        mddev->curr_resync_completed = 0;
-       mddev->resync_min = 0;
-       mddev->resync_max = MaxSector;
+       if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
+               /* We completed so max setting can be forgotten. */
+               mddev->resync_max = MaxSector;
        sysfs_notify(&mddev->kobj, NULL, "sync_completed");
        wake_up(&resync_wait);
        set_bit(MD_RECOVERY_DONE, &mddev->recovery);