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-rw-r--r--fs/btrfs/ctree.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index d56730a67885..34b929bd5c1a 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1365,7 +1365,9 @@ get_old_root(struct btrfs_root *root, u64 time_seq)
"failed to read tree block %llu from get_old_root",
logical);
} else {
+ btrfs_tree_read_lock(old);
eb = btrfs_clone_extent_buffer(old);
+ btrfs_tree_read_unlock(old);
free_extent_buffer(old);
}
} else if (old_root) {