btrfs: restore uuid_mutex in btrfs_open_devices

Commit 542c590 ("btrfs: replace uuid_mutex by
device_list_mutex in btrfs_open_devices") switched to device_list_mutex
as we need that for the device list traversal, but we also need
uuid_mutex to protect access to fs_devices::opened to be consistent with
other users of that item.

CC: Anand Jain <[email protected]>
Signed-off-by: David Sterba <[email protected]>
Reviewed-by: Anand Jain <[email protected]>

Author: kdave

fs/btrfs/volumes.c

@@ -1129,6 +1129,7 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 {
 	int ret;
 
+	mutex_lock(&uuid_mutex);
 	mutex_lock(&fs_devices->device_list_mutex);
 	if (fs_devices->opened) {
 		fs_devices->opened++;
@@ -1138,6 +1139,7 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 		ret = open_fs_devices(fs_devices, flags, holder);
 	}
 	mutex_unlock(&fs_devices->device_list_mutex);
+	mutex_unlock(&uuid_mutex);
 
 	return ret;
 }