XFS_DIRENTER_SPACE_RES
XFS_DIRENTER_SPACE_RES(mp, target_namelen);
ret = XFS_IALLOC_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp, namelen);
ret = XFS_DIRENTER_SPACE_RES(mp, namelen);
ret = XFS_IALLOC_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp, namelen) +