BTRFS_FID_SIZE_CONNECTABLE
if (fh_len < BTRFS_FID_SIZE_CONNECTABLE)
fh_len < BTRFS_FID_SIZE_CONNECTABLE) &&
if (parent && (len < BTRFS_FID_SIZE_CONNECTABLE)) {
*max_len = BTRFS_FID_SIZE_CONNECTABLE;
len = BTRFS_FID_SIZE_CONNECTABLE;