struct ndr { … };
#define NDR_NTSD_OFFSETOF …
int ndr_encode_dos_attr(struct ndr *n, struct xattr_dos_attrib *da);
int ndr_decode_dos_attr(struct ndr *n, struct xattr_dos_attrib *da);
int ndr_encode_posix_acl(struct ndr *n, struct mnt_idmap *idmap,
struct inode *inode, struct xattr_smb_acl *acl,
struct xattr_smb_acl *def_acl);
int ndr_encode_v4_ntacl(struct ndr *n, struct xattr_ntacl *acl);
int ndr_encode_v3_ntacl(struct ndr *n, struct xattr_ntacl *acl);
int ndr_decode_v4_ntacl(struct ndr *n, struct xattr_ntacl *acl);