xref: /onnv-gate/usr/src/head/rpcsvc/nfs4_prot.x (revision 11291:80bdcd03e626)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 *  Copyright (C) The Internet Society (1998-2003).
 *  All Rights Reserved.
 */

/*
 *	nfs4_prot.x
 */

/*
 * Basic typedefs for RFC 1832 data type definitions
 */

/*
 * typedef int		int32_t;
 * typedef unsigned int	uint32_t;
 * typedef hyper		int64_t;
 * typedef unsigned hyper	uint64_t;
 */

/*
 * Sizes
 */
const NFS4_FHSIZE		= 128;
const NFS4_VERIFIER_SIZE	= 8;
const NFS4_OPAQUE_LIMIT		= 1024;

/*
 * File types
 */
enum nfs_ftype4 {
	NF4REG		= 1,	/* Regular File */
	NF4DIR		= 2,	/* Directory */
	NF4BLK		= 3,	/* Special File - block device */
	NF4CHR		= 4,	/* Special File - character device */
	NF4LNK		= 5,	/* Symbolic Link */
	NF4SOCK		= 6,	/* Special File - socket */
	NF4FIFO		= 7,	/* Special File - fifo */
	NF4ATTRDIR	= 8,	/* Attribute Directory */
	NF4NAMEDATTR	= 9	/* Named Attribute */
};

/*
 * Error status
 */
enum nfsstat4 {
	NFS4_OK			= 0,    /* everything is okay      */
	NFS4ERR_PERM		= 1,    /* caller not privileged   */
	NFS4ERR_NOENT		= 2,    /* no such file/directory  */
	NFS4ERR_IO		= 5,    /* hard I/O error          */
	NFS4ERR_NXIO		= 6,    /* no such device          */
	NFS4ERR_ACCESS		= 13,   /* access denied           */
	NFS4ERR_EXIST		= 17,   /* file already exists     */
	NFS4ERR_XDEV		= 18,   /* different filesystems   */
	/* Unused/reserved        19 */
	NFS4ERR_NOTDIR		= 20,   /* should be a directory   */
	NFS4ERR_ISDIR		= 21,   /* should not be directory */
	NFS4ERR_INVAL		= 22,   /* invalid argument        */
	NFS4ERR_FBIG		= 27,   /* file exceeds server max */
	NFS4ERR_NOSPC		= 28,   /* no space on filesystem  */
	NFS4ERR_ROFS		= 30,   /* read-only filesystem    */
	NFS4ERR_MLINK		= 31,   /* too many hard links     */
	NFS4ERR_NAMETOOLONG	= 63,   /* name exceeds server max */
	NFS4ERR_NOTEMPTY	= 66,   /* directory not empty     */
	NFS4ERR_DQUOT		= 69,   /* hard quota limit reached*/
	NFS4ERR_STALE		= 70,   /* file no longer exists   */
	NFS4ERR_BADHANDLE	= 10001,/* Illegal filehandle      */
	NFS4ERR_BAD_COOKIE	= 10003,/* READDIR cookie is stale */
	NFS4ERR_NOTSUPP		= 10004,/* operation not supported */
	NFS4ERR_TOOSMALL	= 10005,/* response limit exceeded */
	NFS4ERR_SERVERFAULT	= 10006,/* undefined server error  */
	NFS4ERR_BADTYPE		= 10007,/* type invalid for CREATE */
	NFS4ERR_DELAY		= 10008,/* file "busy" - retry     */
	NFS4ERR_SAME		= 10009,/* nverify says attrs same */
	NFS4ERR_DENIED		= 10010,/* lock unavailable	   */
	NFS4ERR_EXPIRED		= 10011,/* lock lease expired	   */
	NFS4ERR_LOCKED		= 10012,/* I/O failed due to lock  */
	NFS4ERR_GRACE		= 10013,/* in grace period	   */
	NFS4ERR_FHEXPIRED	= 10014,/* filehandle expired	   */
	NFS4ERR_SHARE_DENIED	= 10015,/* share reserve denied	   */
	NFS4ERR_WRONGSEC	= 10016,/* wrong security flavor   */
	NFS4ERR_CLID_INUSE	= 10017,/* clientid in use	   */
	NFS4ERR_RESOURCE	= 10018,/* resource exhaustion	   */
	NFS4ERR_MOVED		= 10019,/* filesystem relocated	   */
	NFS4ERR_NOFILEHANDLE	= 10020,/* current FH is not set   */
	NFS4ERR_MINOR_VERS_MISMATCH = 10021,/* minor vers not supp */
	NFS4ERR_STALE_CLIENTID	= 10022,/* server has rebooted     */
	NFS4ERR_STALE_STATEID	= 10023,/* server has rebooted     */
	NFS4ERR_OLD_STATEID	= 10024,/* state is out of sync    */
	NFS4ERR_BAD_STATEID	= 10025,/* incorrect stateid       */
	NFS4ERR_BAD_SEQID	= 10026,/* request is out of seq.  */
	NFS4ERR_NOT_SAME	= 10027,/* verify - attrs not same */
	NFS4ERR_LOCK_RANGE	= 10028,/* lock range not supported*/
	NFS4ERR_SYMLINK		= 10029,/* should be file/directory*/
	NFS4ERR_RESTOREFH	= 10030,/* no saved filehandle     */
	NFS4ERR_LEASE_MOVED	= 10031,/* some filesystem moved   */
	NFS4ERR_ATTRNOTSUPP	= 10032,/* recommended attr not sup*/
	NFS4ERR_NO_GRACE	= 10033,/* reclaim outside of grace*/
	NFS4ERR_RECLAIM_BAD	= 10034,/* reclaim error at server */
	NFS4ERR_RECLAIM_CONFLICT = 10035,/* conflict on reclaim    */
	NFS4ERR_BADXDR		= 10036,/* XDR decode failed       */
	NFS4ERR_LOCKS_HELD	= 10037,/* file locks held at CLOSE*/
	NFS4ERR_OPENMODE	= 10038,/* conflict in OPEN and I/O*/
	NFS4ERR_BADOWNER	= 10039,/* owner translation bad   */
	NFS4ERR_BADCHAR		= 10040,/* utf-8 char not supported*/
	NFS4ERR_BADNAME		= 10041,/* name not supported      */
	NFS4ERR_BAD_RANGE	= 10042,/* lock range not supported*/
	NFS4ERR_LOCK_NOTSUPP	= 10043,/* no atomic up/downgrade  */
	NFS4ERR_OP_ILLEGAL	= 10044,/* undefined operation     */
	NFS4ERR_DEADLOCK	= 10045,/* file locking deadlock   */
	NFS4ERR_FILE_OPEN	= 10046,/* open file blocks op.    */
	NFS4ERR_ADMIN_REVOKED	= 10047,/* lockowner state revoked */
	NFS4ERR_CB_PATH_DOWN    = 10048 /* callback path down      */
};

/*
 * Basic data types
 */
typedef uint32_t	bitmap4<>;
typedef uint64_t	offset4;
typedef uint32_t	count4;
typedef	uint64_t	length4;
typedef uint64_t	clientid4;
typedef uint32_t	seqid4;
typedef opaque		utf8string<>;
typedef utf8string	utf8str_cis;
typedef utf8string	utf8str_cs;
typedef utf8string	utf8str_mixed;
typedef utf8str_cs	component4;
typedef	component4	pathname4<>;
typedef uint64_t	nfs_lockid4;
typedef	uint64_t	nfs_cookie4;
typedef	utf8str_cs	linktext4;
typedef opaque		sec_oid4<>;
typedef uint32_t	qop4;
typedef	uint32_t	mode4;
typedef	uint64_t	changeid4;
typedef opaque		verifier4[NFS4_VERIFIER_SIZE];

/*
 * Timeval
 */
struct nfstime4 {
	int64_t		seconds;
	uint32_t	nseconds;
};

enum time_how4 {
	SET_TO_SERVER_TIME4 = 0,
	SET_TO_CLIENT_TIME4 = 1
};

union settime4 switch (time_how4 set_it) {
 case SET_TO_CLIENT_TIME4:
	 nfstime4	time;
 default:
	 void;
};

/*
 * File access handle
 */
typedef	opaque	nfs_fh4<NFS4_FHSIZE>;


/*
 * File attribute definitions
 */

/*
 * FSID structure for major/minor
 */
struct fsid4 {
	uint64_t	major;
	uint64_t	minor;
};

/*
 * Filesystem locations attribute for relocation/migration
 */
struct fs_location4 {
	utf8str_cis	server<>;
	pathname4	rootpath;
};

struct fs_locations4 {
	pathname4	fs_root;
	fs_location4	locations<>;
};

struct nfs_fsl_info {
	uint_t			netbuf_len;
	uint_t			netnm_len;
	uint_t			knconf_len;
	string			netname<MAXNETNAMELEN>;
	struct netbuf		*addr;
	struct knetconfig	*knconf;
};


/*
 * Various Access Control Entry definitions
 */

/*
 * Mask that indicates which Access Control Entries are supported.
 * Values for the fattr4_aclsupport attribute.
 */
const ACL4_SUPPORT_ALLOW_ACL	= 0x00000001;
const ACL4_SUPPORT_DENY_ACL	= 0x00000002;
const ACL4_SUPPORT_AUDIT_ACL	= 0x00000004;
const ACL4_SUPPORT_ALARM_ACL	= 0x00000008;


typedef	uint32_t	acetype4;

/*
 * acetype4 values, others can be added as needed.
 */
const ACE4_ACCESS_ALLOWED_ACE_TYPE	= 0x00000000;
const ACE4_ACCESS_DENIED_ACE_TYPE	= 0x00000001;
const ACE4_SYSTEM_AUDIT_ACE_TYPE	= 0x00000002;
const ACE4_SYSTEM_ALARM_ACE_TYPE	= 0x00000003;


/*
 * ACE flag
 */
typedef uint32_t aceflag4;

/*
 * ACE flag values
 */
const ACE4_FILE_INHERIT_ACE		= 0x00000001;
const ACE4_DIRECTORY_INHERIT_ACE	= 0x00000002;
const ACE4_NO_PROPAGATE_INHERIT_ACE	= 0x00000004;
const ACE4_INHERIT_ONLY_ACE		= 0x00000008;
const ACE4_SUCCESSFUL_ACCESS_ACE_FLAG	= 0x00000010;
const ACE4_FAILED_ACCESS_ACE_FLAG	= 0x00000020;
const ACE4_IDENTIFIER_GROUP		= 0x00000040;


/*
 * ACE mask
 */
typedef uint32_t	acemask4;

/*
 * ACE mask values
 */
const ACE4_READ_DATA		= 0x00000001;
const ACE4_LIST_DIRECTORY	= 0x00000001;
const ACE4_WRITE_DATA		= 0x00000002;
const ACE4_ADD_FILE		= 0x00000002;
const ACE4_APPEND_DATA		= 0x00000004;
const ACE4_ADD_SUBDIRECTORY	= 0x00000004;
const ACE4_READ_NAMED_ATTRS	= 0x00000008;
const ACE4_WRITE_NAMED_ATTRS	= 0x00000010;
const ACE4_EXECUTE		= 0x00000020;
const ACE4_DELETE_CHILD		= 0x00000040;
const ACE4_READ_ATTRIBUTES	= 0x00000080;
const ACE4_WRITE_ATTRIBUTES	= 0x00000100;

const ACE4_DELETE		= 0x00010000;
const ACE4_READ_ACL		= 0x00020000;
const ACE4_WRITE_ACL		= 0x00040000;
const ACE4_WRITE_OWNER		= 0x00080000;
const ACE4_SYNCHRONIZE		= 0x00100000;

/*
 * ACE4_GENERIC_READ -- defined as combination of
 *	ACE4_READ_ACL |
 *	ACE4_READ_DATA |
 *	ACE4_READ_ATTRIBUTES |
 *	ACE4_SYNCHRONIZE
 */

const ACE4_GENERIC_READ	= 0x00120081;

/*
 * ACE4_GENERIC_WRITE -- defined as combination of
 *	ACE4_READ_ACL |
 *	ACE4_WRITE_DATA |
 *	ACE4_WRITE_ATTRIBUTES |
 *	ACE4_WRITE_ACL |
 *	ACE4_APPEND_DATA |
 *	ACE4_SYNCHRONIZE
 */
const ACE4_GENERIC_WRITE = 0x00160106;


/*
 * ACE4_GENERIC_EXECUTE -- defined as combination of
 *	ACE4_READ_ACL
 *	ACE4_READ_ATTRIBUTES
 *	ACE4_EXECUTE
 *	ACE4_SYNCHRONIZE
 */
const ACE4_GENERIC_EXECUTE = 0x001200A0;


/*
 * Access Control Entry definition
 */
struct nfsace4 {
	acetype4	type;
	aceflag4	flag;
	acemask4	access_mask;
	utf8str_mixed	who;
};

/*
 * Field definitions for the fattr4_mode attribute
 */
const MODE4_SUID = 0x800;  /* set user id on execution */
const MODE4_SGID = 0x400;  /* set group id on execution */
const MODE4_SVTX = 0x200;  /* save text even after use */
const MODE4_RUSR = 0x100;  /* read permission: owner */
const MODE4_WUSR = 0x080;  /* write permission: owner */
const MODE4_XUSR = 0x040;  /* execute permission: owner */
const MODE4_RGRP = 0x020;  /* read permission: group */
const MODE4_WGRP = 0x010;  /* write permission: group */
const MODE4_XGRP = 0x008;  /* execute permission: group */
const MODE4_ROTH = 0x004;  /* read permission: other */
const MODE4_WOTH = 0x002;  /* write permission: other */
const MODE4_XOTH = 0x001;  /* execute permission: other */

/*
 * Special data/attribute associated with
 * file types NF4BLK and NF4CHR.
 */
struct specdata4 {
	uint32_t	specdata1;	/* major device number */
	uint32_t	specdata2;	/* minor device number */
};

/*
 * Values for fattr4_fh_expire_type
 */
const	FH4_PERSISTENT		= 0x00000000;
const	FH4_NOEXPIRE_WITH_OPEN	= 0x00000001;
const	FH4_VOLATILE_ANY	= 0x00000002;
const	FH4_VOL_MIGRATION	= 0x00000004;
const	FH4_VOL_RENAME		= 0x00000008;


typedef bitmap4		fattr4_supported_attrs;
typedef nfs_ftype4	fattr4_type;
typedef	uint32_t	fattr4_fh_expire_type;
typedef	changeid4	fattr4_change;
typedef uint64_t	fattr4_size;
typedef	bool		fattr4_link_support;
typedef	bool		fattr4_symlink_support;
typedef bool		fattr4_named_attr;
typedef fsid4		fattr4_fsid;
typedef	bool		fattr4_unique_handles;
typedef uint32_t	fattr4_lease_time;
typedef	nfsstat4	fattr4_rdattr_error;

typedef nfsace4		fattr4_acl<>;
typedef uint32_t	fattr4_aclsupport;
typedef	bool		fattr4_archive;
typedef	bool		fattr4_cansettime;
typedef	bool		fattr4_case_insensitive;
typedef	bool		fattr4_case_preserving;
typedef	bool		fattr4_chown_restricted;
typedef uint64_t	fattr4_fileid;
typedef uint64_t	fattr4_files_avail;
typedef nfs_fh4		fattr4_filehandle;
typedef uint64_t	fattr4_files_free;
typedef uint64_t	fattr4_files_total;
typedef fs_locations4	fattr4_fs_locations;
typedef bool		fattr4_hidden;
typedef bool		fattr4_homogeneous;
typedef uint64_t	fattr4_maxfilesize;
typedef uint32_t	fattr4_maxlink;
typedef uint32_t	fattr4_maxname;
typedef uint64_t	fattr4_maxread;
typedef uint64_t	fattr4_maxwrite;
typedef	utf8str_cs	fattr4_mimetype;
typedef mode4		fattr4_mode;
typedef uint64_t	fattr4_mounted_on_fileid;
typedef	bool		fattr4_no_trunc;
typedef	uint32_t	fattr4_numlinks;
typedef	utf8str_mixed	fattr4_owner;
typedef	utf8str_mixed	fattr4_owner_group;
typedef uint64_t	fattr4_quota_avail_hard;
typedef uint64_t	fattr4_quota_avail_soft;
typedef uint64_t	fattr4_quota_used;
typedef specdata4	fattr4_rawdev;
typedef uint64_t	fattr4_space_avail;
typedef uint64_t	fattr4_space_free;
typedef uint64_t	fattr4_space_total;
typedef uint64_t	fattr4_space_used;
typedef bool		fattr4_system;
typedef nfstime4	fattr4_time_access;
typedef settime4	fattr4_time_access_set;
typedef nfstime4	fattr4_time_backup;
typedef nfstime4	fattr4_time_create;
typedef nfstime4	fattr4_time_delta;
typedef nfstime4	fattr4_time_metadata;
typedef nfstime4	fattr4_time_modify;
typedef settime4	fattr4_time_modify_set;


/*
 * Mandatory Attributes
 */
const FATTR4_SUPPORTED_ATTRS	= 0;
const FATTR4_TYPE		= 1;
const FATTR4_FH_EXPIRE_TYPE	= 2;
const FATTR4_CHANGE		= 3;
const FATTR4_SIZE		= 4;
const FATTR4_LINK_SUPPORT	= 5;
const FATTR4_SYMLINK_SUPPORT	= 6;
const FATTR4_NAMED_ATTR		= 7;
const FATTR4_FSID		= 8;
const FATTR4_UNIQUE_HANDLES	= 9;
const FATTR4_LEASE_TIME		= 10;
const FATTR4_RDATTR_ERROR	= 11;
const FATTR4_FILEHANDLE		= 19;

/*
 * Recommended Attributes
 */
const FATTR4_ACL		= 12;
const FATTR4_ACLSUPPORT		= 13;
const FATTR4_ARCHIVE		= 14;
const FATTR4_CANSETTIME		= 15;
const FATTR4_CASE_INSENSITIVE	= 16;
const FATTR4_CASE_PRESERVING	= 17;
const FATTR4_CHOWN_RESTRICTED	= 18;
const FATTR4_FILEID		= 20;
const FATTR4_FILES_AVAIL	= 21;
const FATTR4_FILES_FREE		= 22;
const FATTR4_FILES_TOTAL	= 23;
const FATTR4_FS_LOCATIONS	= 24;
const FATTR4_HIDDEN		= 25;
const FATTR4_HOMOGENEOUS	= 26;
const FATTR4_MAXFILESIZE	= 27;
const FATTR4_MAXLINK		= 28;
const FATTR4_MAXNAME		= 29;
const FATTR4_MAXREAD		= 30;
const FATTR4_MAXWRITE		= 31;
const FATTR4_MIMETYPE		= 32;
const FATTR4_MODE		= 33;
const FATTR4_NO_TRUNC		= 34;
const FATTR4_NUMLINKS		= 35;
const FATTR4_OWNER		= 36;
const FATTR4_OWNER_GROUP	= 37;
const FATTR4_QUOTA_AVAIL_HARD	= 38;
const FATTR4_QUOTA_AVAIL_SOFT	= 39;
const FATTR4_QUOTA_USED		= 40;
const FATTR4_RAWDEV		= 41;
const FATTR4_SPACE_AVAIL	= 42;
const FATTR4_SPACE_FREE		= 43;
const FATTR4_SPACE_TOTAL	= 44;
const FATTR4_SPACE_USED		= 45;
const FATTR4_SYSTEM		= 46;
const FATTR4_TIME_ACCESS	= 47;
const FATTR4_TIME_ACCESS_SET	= 48;
const FATTR4_TIME_BACKUP	= 49;
const FATTR4_TIME_CREATE	= 50;
const FATTR4_TIME_DELTA		= 51;
const FATTR4_TIME_METADATA	= 52;
const FATTR4_TIME_MODIFY	= 53;
const FATTR4_TIME_MODIFY_SET	= 54;
const FATTR4_MOUNTED_ON_FILEID	= 55;

typedef	opaque	attrlist4<>;

/*
 * File attribute container
 */
struct fattr4 {
	bitmap4		attrmask;
	attrlist4	attr_vals;
};

/*
 * Change info for the client
 */
struct change_info4 {
	bool		atomic;
	changeid4	before;
	changeid4	after;
};

struct clientaddr4 {
	/* see struct rpcb in RFC 1833 */
	string r_netid<>;		/* network id */
	string r_addr<>;		/* universal address */
};

/*
 * Callback program info as provided by the client
 */
struct cb_client4 {
	uint32_t	cb_program;
	clientaddr4	cb_location;
};

/*
 * Stateid
 */
struct stateid4 {
	uint32_t	seqid;
	opaque		other[12];
};

/*
 * Client ID
 */
struct nfs_client_id4 {
	verifier4	verifier;
	opaque		id<NFS4_OPAQUE_LIMIT>;
};

struct open_owner4 {
	clientid4	clientid;
	opaque		owner<NFS4_OPAQUE_LIMIT>;
};

struct lock_owner4 {
	clientid4	clientid;
	opaque		owner<NFS4_OPAQUE_LIMIT>;
};

enum nfs_lock_type4 {
	READ_LT		= 1,
	WRITE_LT	= 2,
	READW_LT	= 3,	/* blocking read */
	WRITEW_LT	= 4	/* blocking write */
};

/*
 * ACCESS: Check access permission
 */
const ACCESS4_READ	= 0x00000001;
const ACCESS4_LOOKUP	= 0x00000002;
const ACCESS4_MODIFY	= 0x00000004;
const ACCESS4_EXTEND	= 0x00000008;
const ACCESS4_DELETE	= 0x00000010;
const ACCESS4_EXECUTE	= 0x00000020;

struct ACCESS4args {
	/* CURRENT_FH: object */
	uint32_t	access;
};

struct ACCESS4resok {
	uint32_t	supported;
	uint32_t	access;
};

union ACCESS4res switch (nfsstat4 status) {
 case NFS4_OK:
	 ACCESS4resok	resok4;
 default:
	 void;
};

/*
 * CLOSE: Close a file and release share reservations
 */
struct CLOSE4args {
	/* CURRENT_FH: object */
	seqid4		seqid;
	stateid4	open_stateid;
};

union CLOSE4res switch (nfsstat4 status) {
 case NFS4_OK:
	 stateid4	open_stateid;
 default:
	 void;
};

/*
 * COMMIT: Commit cached data on server to stable storage
 */
struct COMMIT4args {
	/* CURRENT_FH: file */
	offset4		offset;
	count4		count;
};

struct COMMIT4resok {
	verifier4	writeverf;
};


union COMMIT4res switch (nfsstat4 status) {
 case NFS4_OK:
	 COMMIT4resok	resok4;
 default:
	 void;
};

/*
 * CREATE: Create a non-regular file
 */
union createtype4 switch (nfs_ftype4 type) {
 case NF4LNK:
	 linktext4	linkdata;
 case NF4BLK:
 case NF4CHR:
	 specdata4	devdata;
 case NF4SOCK:
 case NF4FIFO:
 case NF4DIR:
	 void;
 default:
	 void;		/* server should return NFS4ERR_BADTYPE */
};

struct CREATE4args {
	/* CURRENT_FH: directory for creation */
	createtype4	objtype;
	component4	objname;
	fattr4		createattrs;
};

struct CREATE4resok {
	change_info4	cinfo;
	bitmap4		attrset;	/* attributes set */
};

union CREATE4res switch (nfsstat4 status) {
 case NFS4_OK:
	 CREATE4resok resok4;
 default:
	 void;
};

/*
 * DELEGPURGE: Purge Delegations Awaiting Recovery
 */
struct DELEGPURGE4args {
	clientid4	clientid;
};

struct DELEGPURGE4res {
	nfsstat4	status;
};

/*
 * DELEGRETURN: Return a delegation
 */
struct DELEGRETURN4args {
	/* CURRENT_FH: delegated file */
	stateid4	deleg_stateid;
};

struct DELEGRETURN4res {
	nfsstat4	status;
};

/*
 * GETATTR: Get file attributes
 */
struct GETATTR4args {
	/* CURRENT_FH: directory or file */
	bitmap4		attr_request;
};

struct GETATTR4resok {
	fattr4		obj_attributes;
};

union GETATTR4res switch (nfsstat4 status) {
 case NFS4_OK:
	 GETATTR4resok	resok4;
 default:
	 void;
};

/*
 * GETFH: Get current filehandle
 */
struct GETFH4resok {
	nfs_fh4		object;
};

union GETFH4res switch (nfsstat4 status) {
 case NFS4_OK:
	GETFH4resok	resok4;
 default:
	void;
};

/*
 * LINK: Create link to an object
 */
struct LINK4args {
	/* SAVED_FH: source object */
	/* CURRENT_FH: target directory */
	component4	newname;
};

struct LINK4resok {
	change_info4	cinfo;
};

union LINK4res switch (nfsstat4 status) {
 case NFS4_OK:
	 LINK4resok resok4;
 default:
	 void;
};

/*
 * For LOCK, transition from open_owner to new lock_owner
 */
struct open_to_lock_owner4 {
	seqid4		open_seqid;
	stateid4	open_stateid;
	seqid4		lock_seqid;
	lock_owner4	lock_owner;
};

/*
 * For LOCK, existing lock_owner continues to request file locks
 */
struct exist_lock_owner4 {
	stateid4	lock_stateid;
	seqid4		lock_seqid;
};

union locker4 switch (bool new_lock_owner) {
 case TRUE:
	open_to_lock_owner4	open_owner;
 case FALSE:
	exist_lock_owner4	lock_owner;
};

/*
 * LOCK/LOCKT/LOCKU: Record lock management
 */
struct LOCK4args {
	/* CURRENT_FH: file */
	nfs_lock_type4	locktype;
	bool		reclaim;
	offset4		offset;
	length4		length;
	locker4		locker;
};

struct LOCK4denied {
	offset4		offset;
	length4		length;
	nfs_lock_type4	locktype;
	lock_owner4	owner;
};

struct LOCK4resok {
	stateid4	lock_stateid;
};

union LOCK4res switch (nfsstat4 status) {
 case NFS4_OK:
	 LOCK4resok	resok4;
 case NFS4ERR_DENIED:
	 LOCK4denied	denied;
 default:
	 void;
};

struct LOCKT4args {
	/* CURRENT_FH: file */
	nfs_lock_type4	locktype;
	offset4		offset;
	length4		length;
	lock_owner4	owner;
};

union LOCKT4res switch (nfsstat4 status) {
 case NFS4ERR_DENIED:
	 LOCK4denied	denied;
 case NFS4_OK:
	 void;
 default:
	 void;
};

struct LOCKU4args {
	/* CURRENT_FH: file */
	nfs_lock_type4	locktype;
	seqid4		seqid;
	stateid4	lock_stateid;
	offset4		offset;
	length4		length;
};

union LOCKU4res switch (nfsstat4 status) {
 case	NFS4_OK:
	 stateid4	lock_stateid;
 default:
	 void;
};

/*
 * LOOKUP: Lookup filename
 */
struct LOOKUP4args {
	/* CURRENT_FH: directory */
	component4	objname;
};

struct LOOKUP4res {
	/* CURRENT_FH: object */
	nfsstat4	status;
};

/*
 * LOOKUPP: Lookup parent directory
 */
struct LOOKUPP4res {
	/* CURRENT_FH: directory */
	nfsstat4	status;
};

/*
 * NVERIFY: Verify attributes different
 */
struct NVERIFY4args {
	/* CURRENT_FH: object */
	fattr4		obj_attributes;
};

struct NVERIFY4res {
	nfsstat4	status;
};

/*
 * Various definitions for OPEN
 */
enum createmode4 {
	UNCHECKED4	= 0,
	GUARDED4	= 1,
	EXCLUSIVE4	= 2
};

union createhow4 switch (createmode4 mode) {
 case UNCHECKED4:
 case GUARDED4:
	 fattr4		createattrs;
 case EXCLUSIVE4:
	 verifier4	createverf;
};

enum opentype4 {
	OPEN4_NOCREATE	= 0,
	OPEN4_CREATE	= 1
};

union openflag4 switch (opentype4 opentype) {
 case OPEN4_CREATE:
	 createhow4	how;
 default:
	 void;
};

/* Next definitions used for OPEN delegation */
enum limit_by4 {
	NFS_LIMIT_SIZE		= 1,
	NFS_LIMIT_BLOCKS	= 2
	/* others as needed */
};

struct nfs_modified_limit4 {
	uint32_t	num_blocks;
	uint32_t	bytes_per_block;
};

union nfs_space_limit4 switch (limit_by4 limitby) {
 /* limit specified as file size */
 case NFS_LIMIT_SIZE:
	 uint64_t		filesize;
 /* limit specified by number of blocks */
 case NFS_LIMIT_BLOCKS:
	 nfs_modified_limit4	mod_blocks;
} ;

/*
 * Share Access and Deny constants for open argument
 */
const OPEN4_SHARE_ACCESS_READ	= 0x00000001;
const OPEN4_SHARE_ACCESS_WRITE	= 0x00000002;
const OPEN4_SHARE_ACCESS_BOTH	= 0x00000003;

const OPEN4_SHARE_DENY_NONE	= 0x00000000;
const OPEN4_SHARE_DENY_READ	= 0x00000001;
const OPEN4_SHARE_DENY_WRITE	= 0x00000002;
const OPEN4_SHARE_DENY_BOTH	= 0x00000003;

enum open_delegation_type4 {
	OPEN_DELEGATE_NONE	= 0,
	OPEN_DELEGATE_READ	= 1,
	OPEN_DELEGATE_WRITE	= 2
};

enum open_claim_type4 {
	CLAIM_NULL		= 0,
	CLAIM_PREVIOUS		= 1,
	CLAIM_DELEGATE_CUR	= 2,
	CLAIM_DELEGATE_PREV	= 3
};

struct open_claim_delegate_cur4 {
	stateid4	delegate_stateid;
	component4	file;
};

union open_claim4 switch (open_claim_type4 claim) {
 /*
  * No special rights to file. Ordinary OPEN of the specified file.
  */
 case CLAIM_NULL:
	/* CURRENT_FH: directory */
	component4	file;

 /*
  * Right to the file established by an open previous to server
  * reboot.  File identified by filehandle obtained at that time
  * rather than by name.
  */
 case CLAIM_PREVIOUS:
	/* CURRENT_FH: file being reclaimed */
	open_delegation_type4	delegate_type;

 /*
  * Right to file based on a delegation granted by the server.
  * File is specified by name.
  */
 case CLAIM_DELEGATE_CUR:
	/* CURRENT_FH: directory */
	open_claim_delegate_cur4	delegate_cur_info;

 /* Right to file based on a delegation granted to a previous boot
  * instance of the client.  File is specified by name.
  */
 case CLAIM_DELEGATE_PREV:
	 /* CURRENT_FH: directory */
	component4	file_delegate_prev;
};

/*
 * OPEN: Open a file, potentially receiving an open delegation
 */
struct OPEN4args {
	seqid4		seqid;
	uint32_t	share_access;
	uint32_t	share_deny;
	open_owner4	owner;
	openflag4	openhow;
	open_claim4	claim;
};

struct open_read_delegation4 {
	stateid4	stateid;	/* Stateid for delegation*/
	bool		recall;		/* Pre-recalled flag for
					   delegations obtained
					   by reclaim
					   (CLAIM_PREVIOUS) */
	nfsace4		permissions;	/* Defines users who don't
					   need an ACCESS call to
					   open for read */
};

struct open_write_delegation4 {
	stateid4	stateid;	/* Stateid for delegation */
	bool		recall;		/* Pre-recalled flag for
					   delegations obtained
					   by reclaim
					   (CLAIM_PREVIOUS) */
	nfs_space_limit4 space_limit;	/* Defines condition that
					   the client must check to
					   determine whether the
					   file needs to be flushed
					   to the server on close.
					   */
	nfsace4		permissions;	/* Defines users who don't
					   need an ACCESS call as
					   part of a delegated
					   open. */
};

union open_delegation4
switch (open_delegation_type4 delegation_type) {
	case OPEN_DELEGATE_NONE:
		void;
	case OPEN_DELEGATE_READ:
		open_read_delegation4 read;
	case OPEN_DELEGATE_WRITE:
		open_write_delegation4 write;
};

/*
 * Result flags
 */
/* Client must confirm open */
const OPEN4_RESULT_CONFIRM	= 0x00000002;
/* Type of file locking behavior at the server */
const OPEN4_RESULT_LOCKTYPE_POSIX = 0x00000004;

struct OPEN4resok {
	stateid4	stateid;	/* Stateid for open */
	change_info4	cinfo;		/* Directory Change Info */
	uint32_t	rflags;		/* Result flags */
	bitmap4		attrset;	/* attribute set for create*/
	open_delegation4 delegation;	/* Info on any open
					   delegation */
};

union OPEN4res switch (nfsstat4 status) {
 case NFS4_OK:
	/* CURRENT_FH: opened file */
	OPEN4resok	resok4;
 default:
	void;
};

/*
 * OPENATTR: open named attributes directory
 */
struct OPENATTR4args {
	/* CURRENT_FH: object */
	bool	createdir;
};

struct OPENATTR4res {
	/* CURRENT_FH: named attr directory */
	nfsstat4	status;
};

/*
 * OPEN_CONFIRM: confirm the open
 */
struct OPEN_CONFIRM4args {
	/* CURRENT_FH: opened file */
	stateid4	open_stateid;
	seqid4		seqid;
};

struct OPEN_CONFIRM4resok {
	stateid4	open_stateid;
};

union OPEN_CONFIRM4res switch (nfsstat4 status) {
 case NFS4_OK:
	 OPEN_CONFIRM4resok	resok4;
 default:
	 void;
};

/*
 * OPEN_DOWNGRADE: downgrade the access/deny for a file
 */
struct OPEN_DOWNGRADE4args {
	/* CURRENT_FH: opened file */
	stateid4	open_stateid;
	seqid4		seqid;
	uint32_t	share_access;
	uint32_t	share_deny;
};

struct OPEN_DOWNGRADE4resok {
	stateid4	open_stateid;
};

union OPEN_DOWNGRADE4res switch(nfsstat4 status) {
 case NFS4_OK:
	OPEN_DOWNGRADE4resok	resok4;
 default:
	 void;
};

/*
 * PUTFH: Set current filehandle
 */
struct PUTFH4args {
	nfs_fh4		object;
};

struct PUTFH4res {
	/* CURRENT_FH: */
	nfsstat4	status;
};

/*
 * PUTPUBFH: Set public filehandle
 */
struct PUTPUBFH4res {
	/* CURRENT_FH: public fh */
	nfsstat4	status;
};

/*
 * PUTROOTFH: Set root filehandle
 */
struct PUTROOTFH4res {
	/* CURRENT_FH: root fh */
	nfsstat4	status;
};

/*
 * READ: Read from file
 */
struct READ4args {
	/* CURRENT_FH: file */
	stateid4	stateid;
	offset4		offset;
	count4		count;
};

struct READ4resok {
	bool		eof;
	opaque		data<>;
};

union READ4res switch (nfsstat4 status) {
 case NFS4_OK:
	 READ4resok	resok4;
 default:
	 void;
};

/*
 * READDIR: Read directory
 */
struct READDIR4args {
	/* CURRENT_FH: directory */
	nfs_cookie4	cookie;
	verifier4	cookieverf;
	count4		dircount;
	count4		maxcount;
	bitmap4		attr_request;
};

struct entry4 {
	nfs_cookie4	cookie;
	component4	name;
	fattr4		attrs;
	entry4		*nextentry;
};

struct dirlist4 {
	entry4		*entries;
	bool		eof;
};

struct READDIR4resok {
	verifier4	cookieverf;
	dirlist4	reply;
};


union READDIR4res switch (nfsstat4 status) {
 case NFS4_OK:
	 READDIR4resok	resok4;
 default:
	 void;
};


/*
 * READLINK: Read symbolic link
 */
struct READLINK4resok {
	linktext4	link;
};

union READLINK4res switch (nfsstat4 status) {
 case NFS4_OK:
	 READLINK4resok	resok4;
 default:
	 void;
};

/*
 * REMOVE: Remove filesystem object
 */
struct REMOVE4args {
	/* CURRENT_FH: directory */
	component4	target;
};

struct REMOVE4resok {
	change_info4	cinfo;
};

union REMOVE4res switch (nfsstat4 status) {
 case NFS4_OK:
	 REMOVE4resok	resok4;
 default:
	 void;
};

/*
 * RENAME: Rename directory entry
 */
struct RENAME4args {
	/* SAVED_FH: source directory */
	component4	oldname;
	/* CURRENT_FH: target directory */
	component4	newname;
};

struct RENAME4resok {
	change_info4	source_cinfo;
	change_info4	target_cinfo;
};

union RENAME4res switch (nfsstat4 status) {
 case NFS4_OK:
	RENAME4resok	resok4;
 default:
	void;
};

/*
 * RENEW: Renew a Lease
 */
struct RENEW4args {
	clientid4	clientid;
};

struct RENEW4res {
	nfsstat4	status;
};

/*
 * RESTOREFH: Restore saved filehandle
 */

struct RESTOREFH4res {
	/* CURRENT_FH: value of saved fh */
	nfsstat4	status;
};

/*
 * SAVEFH: Save current filehandle
 */
struct SAVEFH4res {
	/* SAVED_FH: value of current fh */
	nfsstat4	status;
};

/*
 * SECINFO: Obtain Available Security Mechanisms
 */
struct SECINFO4args {
	/* CURRENT_FH: directory */
	component4	name;
};

/*
 * From RFC 2203
 */
enum rpc_gss_svc_t {
	RPC_GSS_SVC_NONE	= 1,
	RPC_GSS_SVC_INTEGRITY	= 2,
	RPC_GSS_SVC_PRIVACY	= 3
};

struct rpcsec_gss_info {
	sec_oid4	oid;
	qop4		qop;
	rpc_gss_svc_t	service;
};

/* RPCSEC_GSS has a value of '6' - See RFC 2203 */
union secinfo4 switch (uint32_t flavor) {
 case RPCSEC_GSS:
	 rpcsec_gss_info	flavor_info;
 default:
	 void;
};

typedef secinfo4 SECINFO4resok<>;

union SECINFO4res switch (nfsstat4 status) {
 case NFS4_OK:
	 SECINFO4resok resok4;
 default:
	 void;
};

/*
 * SETATTR: Set attributes
 */
struct SETATTR4args {
	/* CURRENT_FH: target object */
	stateid4	stateid;
	fattr4		obj_attributes;
};

struct SETATTR4res {
	nfsstat4	status;
	bitmap4		attrsset;
};

/*
 * SETCLIENTID
 */
struct SETCLIENTID4args {
	nfs_client_id4	client;
	cb_client4	callback;
	uint32_t	callback_ident;
};

struct SETCLIENTID4resok {
	clientid4	clientid;
	verifier4	setclientid_confirm;
};

union SETCLIENTID4res switch (nfsstat4 status) {
 case NFS4_OK:
	 SETCLIENTID4resok	resok4;
 case NFS4ERR_CLID_INUSE:
	 clientaddr4	client_using;
 default:
	 void;
};

struct SETCLIENTID_CONFIRM4args {
	clientid4	clientid;
	verifier4	setclientid_confirm;
};

struct SETCLIENTID_CONFIRM4res {
	nfsstat4	status;
};

/*
 * VERIFY: Verify attributes same
 */
struct VERIFY4args {
	/* CURRENT_FH: object */
	fattr4		obj_attributes;
};

struct VERIFY4res {
	nfsstat4	status;
};

/*
 * WRITE: Write to file
 */
enum stable_how4 {
	UNSTABLE4	= 0,
	DATA_SYNC4	= 1,
	FILE_SYNC4	= 2
};

struct WRITE4args {
	/* CURRENT_FH: file */
	stateid4	stateid;
	offset4		offset;
	stable_how4	stable;
	opaque		data<>;
};

struct WRITE4resok {
	count4		count;
	stable_how4	committed;
	verifier4	writeverf;
};

union WRITE4res switch (nfsstat4 status) {
 case NFS4_OK:
	 WRITE4resok	resok4;
 default:
	 void;
};

/*
 * RELEASE_LOCKOWNER: Notify server to release lockowner
 */
struct RELEASE_LOCKOWNER4args {
	lock_owner4	lock_owner;
};

struct RELEASE_LOCKOWNER4res {
	nfsstat4	status;
};

/*
 * ILLEGAL: Response for illegal operation numbers
 */
struct ILLEGAL4res {
	nfsstat4        status;
};

/*
 * Operation arrays
 */

enum nfs_opnum4 {
	OP_ACCESS		= 3,
	OP_CLOSE		= 4,
	OP_COMMIT		= 5,
	OP_CREATE		= 6,
	OP_DELEGPURGE		= 7,
	OP_DELEGRETURN		= 8,
	OP_GETATTR		= 9,
	OP_GETFH		= 10,
	OP_LINK			= 11,
	OP_LOCK			= 12,
	OP_LOCKT		= 13,
	OP_LOCKU		= 14,
	OP_LOOKUP		= 15,
	OP_LOOKUPP		= 16,
	OP_NVERIFY		= 17,
	OP_OPEN			= 18,
	OP_OPENATTR		= 19,
	OP_OPEN_CONFIRM		= 20,
	OP_OPEN_DOWNGRADE	= 21,
	OP_PUTFH		= 22,
	OP_PUTPUBFH		= 23,
	OP_PUTROOTFH		= 24,
	OP_READ			= 25,
	OP_READDIR		= 26,
	OP_READLINK		= 27,
	OP_REMOVE		= 28,
	OP_RENAME		= 29,
	OP_RENEW		= 30,
	OP_RESTOREFH		= 31,
	OP_SAVEFH		= 32,
	OP_SECINFO		= 33,
	OP_SETATTR		= 34,
	OP_SETCLIENTID		= 35,
	OP_SETCLIENTID_CONFIRM	= 36,
	OP_VERIFY		= 37,
	OP_WRITE		= 38,
	OP_RELEASE_LOCKOWNER	= 39,
	OP_ILLEGAL		= 10044
};

union nfs_argop4 switch (nfs_opnum4 argop) {
 case OP_ACCESS:	ACCESS4args opaccess;
 case OP_CLOSE:		CLOSE4args opclose;
 case OP_COMMIT:	COMMIT4args opcommit;
 case OP_CREATE:	CREATE4args opcreate;
 case OP_DELEGPURGE:	DELEGPURGE4args opdelegpurge;
 case OP_DELEGRETURN:	DELEGRETURN4args opdelegreturn;
 case OP_GETATTR:	GETATTR4args opgetattr;
 case OP_GETFH:		void;
 case OP_LINK:		LINK4args oplink;
 case OP_LOCK:		LOCK4args oplock;
 case OP_LOCKT:		LOCKT4args oplockt;
 case OP_LOCKU:		LOCKU4args oplocku;
 case OP_LOOKUP:	LOOKUP4args oplookup;
 case OP_LOOKUPP:	void;
 case OP_NVERIFY:	NVERIFY4args opnverify;
 case OP_OPEN:		OPEN4args opopen;
 case OP_OPENATTR:	OPENATTR4args opopenattr;
 case OP_OPEN_CONFIRM:	OPEN_CONFIRM4args opopen_confirm;
 case OP_OPEN_DOWNGRADE:	OPEN_DOWNGRADE4args opopen_downgrade;
 case OP_PUTFH:		PUTFH4args opputfh;
 case OP_PUTPUBFH:	void;
 case OP_PUTROOTFH:	void;
 case OP_READ:		READ4args opread;
 case OP_READDIR:	READDIR4args opreaddir;
 case OP_READLINK:	void;
 case OP_REMOVE:	REMOVE4args opremove;
 case OP_RENAME:	RENAME4args oprename;
 case OP_RENEW:		RENEW4args oprenew;
 case OP_RESTOREFH:	void;
 case OP_SAVEFH:	void;
 case OP_SECINFO:	SECINFO4args opsecinfo;
 case OP_SETATTR:	SETATTR4args opsetattr;
 case OP_SETCLIENTID:	SETCLIENTID4args opsetclientid;
 case OP_SETCLIENTID_CONFIRM:	SETCLIENTID_CONFIRM4args
					opsetclientid_confirm;
 case OP_VERIFY:	VERIFY4args opverify;
 case OP_WRITE:		WRITE4args opwrite;
 case OP_RELEASE_LOCKOWNER:	RELEASE_LOCKOWNER4args
				    oprelease_lockowner;
 case OP_ILLEGAL:	void;
};

union nfs_resop4 switch (nfs_opnum4 resop){
 case OP_ACCESS:	ACCESS4res opaccess;
 case OP_CLOSE:		CLOSE4res opclose;
 case OP_COMMIT:	COMMIT4res opcommit;
 case OP_CREATE:	CREATE4res opcreate;
 case OP_DELEGPURGE:	DELEGPURGE4res opdelegpurge;
 case OP_DELEGRETURN:	DELEGRETURN4res opdelegreturn;
 case OP_GETATTR:	GETATTR4res opgetattr;
 case OP_GETFH:		GETFH4res opgetfh;
 case OP_LINK:		LINK4res oplink;
 case OP_LOCK:		LOCK4res oplock;
 case OP_LOCKT:		LOCKT4res oplockt;
 case OP_LOCKU:		LOCKU4res oplocku;
 case OP_LOOKUP:	LOOKUP4res oplookup;
 case OP_LOOKUPP:	LOOKUPP4res oplookupp;
 case OP_NVERIFY:	NVERIFY4res opnverify;
 case OP_OPEN:		OPEN4res opopen;
 case OP_OPENATTR:	OPENATTR4res opopenattr;
 case OP_OPEN_CONFIRM:	OPEN_CONFIRM4res opopen_confirm;
 case OP_OPEN_DOWNGRADE:	OPEN_DOWNGRADE4res opopen_downgrade;
 case OP_PUTFH:		PUTFH4res opputfh;
 case OP_PUTPUBFH:	PUTPUBFH4res opputpubfh;
 case OP_PUTROOTFH:	PUTROOTFH4res opputrootfh;
 case OP_READ:		READ4res opread;
 case OP_READDIR:	READDIR4res opreaddir;
 case OP_READLINK:	READLINK4res opreadlink;
 case OP_REMOVE:	REMOVE4res opremove;
 case OP_RENAME:	RENAME4res oprename;
 case OP_RENEW:		RENEW4res oprenew;
 case OP_RESTOREFH:	RESTOREFH4res oprestorefh;
 case OP_SAVEFH:	SAVEFH4res opsavefh;
 case OP_SECINFO:	SECINFO4res opsecinfo;
 case OP_SETATTR:	SETATTR4res opsetattr;
 case OP_SETCLIENTID:	SETCLIENTID4res opsetclientid;
 case OP_SETCLIENTID_CONFIRM:	SETCLIENTID_CONFIRM4res
					opsetclientid_confirm;
 case OP_VERIFY:	VERIFY4res opverify;
 case OP_WRITE:		WRITE4res opwrite;
 case OP_RELEASE_LOCKOWNER:	RELEASE_LOCKOWNER4res
				    oprelease_lockowner;
 case OP_ILLEGAL:	ILLEGAL4res opillegal;
};

struct COMPOUND4args {
	utf8str_cs	tag;
	uint32_t	minorversion;
	nfs_argop4	argarray<>;
};

struct COMPOUND4res {
	nfsstat4 status;
	utf8str_cs	tag;
	nfs_resop4	resarray<>;
};

/*
 * Remote file service routines
 */
program NFS4_PROGRAM {
	version NFS_V4 {
		void
			NFSPROC4_NULL(void) = 0;

		COMPOUND4res
			NFSPROC4_COMPOUND(COMPOUND4args) = 1;

	} = 4;
} = 100003;



/*
 * NFS4 Callback Procedure Definitions and Program
 */

/*
 * CB_GETATTR: Get Current Attributes
 */
struct CB_GETATTR4args {
	nfs_fh4	fh;
	bitmap4	attr_request;
};

struct CB_GETATTR4resok {
	fattr4	obj_attributes;
};

union CB_GETATTR4res switch (nfsstat4 status) {
 case NFS4_OK:
	 CB_GETATTR4resok	resok4;
 default:
	 void;
};

/*
 * CB_RECALL: Recall an Open Delegation
 */
struct CB_RECALL4args {
	stateid4	stateid;
	bool		truncate;
	nfs_fh4		fh;
};

struct CB_RECALL4res {
	nfsstat4	status;
};

/*
 * CB_ILLEGAL: Response for illegal operation numbers
 */
struct CB_ILLEGAL4res {
	nfsstat4        status;
};

/*
 * Various definitions for CB_COMPOUND
 */
enum nfs_cb_opnum4 {
	OP_CB_GETATTR		= 3,
	OP_CB_RECALL		= 4,
	OP_CB_ILLEGAL		= 10044
};

union nfs_cb_argop4 switch (unsigned argop) {
 case OP_CB_GETATTR:	CB_GETATTR4args opcbgetattr;
 case OP_CB_RECALL:	CB_RECALL4args	opcbrecall;
 case OP_CB_ILLEGAL:	void;
};

union nfs_cb_resop4 switch (unsigned resop){
 case OP_CB_GETATTR:	CB_GETATTR4res	opcbgetattr;
 case OP_CB_RECALL:	CB_RECALL4res	opcbrecall;
 case OP_CB_ILLEGAL:	CB_ILLEGAL4res	opcbillegal;
};

struct CB_COMPOUND4args {
	utf8str_cs	tag;
	uint32_t	minorversion;
	uint32_t	callback_ident;
	nfs_cb_argop4	argarray<>;
};

struct CB_COMPOUND4res {
	nfsstat4 status;
	utf8str_cs	tag;
	nfs_cb_resop4	resarray<>;
};


/*
 * Program number is in the transient range since the client
 * will assign the exact transient program number and provide
 * that to the server via the SETCLIENTID operation.
 */
program NFS4_CALLBACK {
	version NFS_CB {
		void
			CB_NULL(void) = 0;
		CB_COMPOUND4res
			CB_COMPOUND(CB_COMPOUND4args) = 1;
	} = 1;
} = 0x40000000;