exp_sb
if (!old_valid_dev(exp_sb(exp)->s_dev))
return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
} else if (!old_valid_dev(exp_sb(exp)->s_dev))
dev_t ex_dev = exp_sb(exp)->s_dev;
if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)