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/disk-io.c b/fs/btrfs/disk-io.c
index 4cdc0b6a2672..8f4c40033e92 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1287,6 +1287,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
         mutex_init(&fs_info->chunk_mutex);
         mutex_init(&fs_info->transaction_kthread_mutex);
         mutex_init(&fs_info->cleaner_mutex);
+        mutex_init(&fs_info->volume_mutex);
 
 #if 0
         ret = add_hasher(fs_info, "crc32c");