xfs_acl
? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
(sizeof(struct xfs_acl) + \
XFS_CHECK_STRUCT_SIZE(struct xfs_acl, 4);
const struct xfs_acl *aclp,
xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)