[PATCH] Btrfs: adjust the fs_devices->missing count on unmount

[Josef Bacik <jbacik@fusionio.com>]

I noticed that if I tried to mount a file system with -o degraded after having
done it once already we would fail to mount.  This is because the
fs_devices->missing count was getting bumped everytime we mounted, but not
getting reset whenever we unmounted.  To fix this we just drop the missing count
as we're closing devices to make sure this doesn't happen.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
---
 fs/btrfs/volumes.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 74614e3..f42e412 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -673,6 +673,8 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
 
 		if (device->can_discard)
 			fs_devices->num_can_discard--;
+		if (device->missing)
+			fs_devices->missing_devices--;
 
 		new_device = btrfs_alloc_device(NULL, &device->devid,
 						device->uuid);
-- 
1.7.7.6