vfsgid_valid
if (!vfsgid_valid(vfsgid) &&
!vfsgid_valid(i_gid_into_vfsgid(idmap, inode)))
!vfsgid_valid(i_gid_into_vfsgid(idmap, inode)))
!vfsgid_valid(i_gid_into_vfsgid(idmap, inode)))
!vfsgid_valid(i_gid_into_vfsgid(idmap, inode));
return vfsgid_valid(vfsgid) && __vfsgid_val(vfsgid) == __kgid_val(kgid);
return vfsgid_valid(left) && __vfsgid_val(left) == __vfsgid_val(right);