[PATCH] md: allow checkpoint of recovery with version-1 superblock

For a while we have had checkpointing of resync.  The version-1 superblock
allows recovery to be checkpointed as well, and this patch implements that.

Due to early carelessness we need to add a feature flag to signal that the
recovery_offset field is in use, otherwise older kernels would assume that a
partially recovered array is in fact fully recovered.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 9ba73074df04..970eb03ec6c0 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3555,6 +3555,7 @@ static int raid5_start_reshape(mddev_t *mddev)
                                 set_bit(In_sync, &rdev->flags);
                                 conf->working_disks++;
                                 added_devices++;
+                                rdev->recovery_offset = 0;
                                 sprintf(nm, "rd%d", rdev->raid_disk);
                                 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
                         } else