Commit e5846fc6 authored by Chris Mason's avatar Chris Mason
Browse files

Btrfs: Add properly locking around add_root_to_dirty_list 



add_root_to_dirty_list happens once at the very beginning of the
transaction, but it is still racey.

Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent dc7fdde3

fs/btrfs/ctree.c

+2 −0
Original line number Diff line number Diff line
@@ -220,10 +220,12 @@ struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root) 
 */

static void add_root_to_dirty_list(struct btrfs_root *root)

{

	spin_lock(&root->fs_info->trans_lock);

	if (root->track_dirty && list_empty(&root->dirty_list)) {

		list_add(&root->dirty_list,

			 &root->fs_info->dirty_cowonly_roots);

	}

	spin_unlock(&root->fs_info->trans_lock);

}



/*