[PATCH v2 2/2] btrfs: handle volume split brain condition for dynamically reappearing device

[Anand Jain <anand.jain@oracle.com>]

When the missing device reappears and joins the RAID group, and if there
are no more missing device at the volume level, then reset the
BTRFS_SUPER_FLAG_VOL_MOVED_ON flag.

This patch is on top of the patch [1] in the ML.
[1] btrfs: handle dynamically reappearing missing device

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
On top of misc-next kdave.
v2:
 Rename to BTRFS_SUPER_FLAG_DEGRADED.

 fs/btrfs/volumes.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 65d10f38dd99..32571f4fa72b 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -858,6 +858,10 @@ static noinline int device_list_add(const char *path,
 
 			fs_devices->missing_devices--;
 			clear_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
+			if (!fs_devices->missing_devices)
+				btrfs_set_super_flags(fs_info->super_copy,
+						      fs_info->super_copy->flags &
+						      ~BTRFS_SUPER_FLAG_DEGRADED);
 
 			if (test_bit(BTRFS_DEV_STATE_WRITEABLE,
 				     &device->dev_state) &&
-- 
2.7.0