Btrfs: Add locking around volume management (device add/remove/balance)

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index a28796482b4a..f3783dbd9b60 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -523,6 +523,7 @@ struct btrfs_fs_info {
         struct mutex alloc_mutex;
         struct mutex chunk_mutex;
         struct mutex drop_mutex;
+        struct mutex volume_mutex;
         struct list_head trans_list;
         struct list_head hashers;
         struct list_head dead_roots;