USEBACKUPROOT    3309 fs/btrfs/disk-io.c 	btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
USEBACKUPROOT    3367 fs/btrfs/disk-io.c 	if (!btrfs_test_opt(fs_info, USEBACKUPROOT))
USEBACKUPROOT     772 fs/btrfs/super.c 			btrfs_set_opt(info->mount_opt, USEBACKUPROOT);