[PATCH 3/6] btrfs: update device_list_mutex protected items

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

Include items of fs_uuids::fs_devices to be protected by
device_list_mutex, like (but not limited to) fs_devices::opened,
fs_devices::total_devices and fs_devices::num_devices. This is
been done in the code already.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 fs/btrfs/volumes.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 0fdb9b717398..e3dd25238eb9 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -164,7 +164,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
  *
  * fs_devices::device_list_mutex (per-fs, with RCU)
  * ------------------------------------------------
- * protects updates to fs_devices::devices, ie. adding and deleting
+ * Protects updates to fs_uuids::fs_devices items, and fs_devices::devices, ie.
+ * adding and deleting.
  *
  * simple list traversal with read-only actions can be done with RCU protection
  *
-- 
2.7.0