Btrfs: hold trans_mutex when using btrfs_record_root_in_trans

btrfs_record_root_in_trans needs the trans_mutex held to make sure two
callers don't race to setup the root in a given transaction.  This adds
it to all the places that were missing it.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 20794290256b..9c462fbd60fa 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -2832,7 +2832,9 @@ again:
                 BUG_ON(!wc.replay_dest);
 
                 wc.replay_dest->log_root = log;
+                mutex_lock(&fs_info->trans_mutex);
                 btrfs_record_root_in_trans(wc.replay_dest);
+                mutex_unlock(&fs_info->trans_mutex);
                 ret = walk_log_tree(trans, log, &wc);
                 BUG_ON(ret);