btrfs: restore uuid_mutex in btrfs_open_devices

Commit 542c5908abfe84f7b4c1 ("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.

Fixes: 542c5908abfe84f7b4c1 ("btrfs: replace uuid_mutex by device_list_mutex in btrfs_open_devices")
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index e034ad9e23b4..1da162928d1a 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1146,6 +1146,7 @@ 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++;
@@ -1155,6 +1156,7 @@ 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;
 }