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Convert all the NFS macros (in nfsm_subs.h) into inline functions with the
appropriate extra arguments.

This (hopefully) completes the unmessyfication work started by thib@ a long,
long time ago (in a galaxy far away).

The conversion logic has been:
- nfsm_dissect has been turned into an rvalue expression, leaving the
  cast operation up to its caller.
- macros which had three different exit paths (return, goto nfsmout or
  fallthrough) have been split so that no macros have more than two exit paths.
- then they have been modified to return a value, which lets the caller
  figure out what exit path is needed.
- local variables abused by the macros are now local variables of the new
  inline functions.

This single commit is the sum of 25 intermediate diffs, which have all been
carefully reviewed by (at least) jsg@ and semarie@.

Tested with v2 and v3 servers and clients.

ok jsg@ semarie@

/*	$OpenBSD: nfsnode.h,v 1.43 2024/04/30 17:04:23 miod Exp $	*/
/*	$NetBSD: nfsnode.h,v 1.16 1996/02/18 11:54:04 fvdl Exp $	*/

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)nfsnode.h	8.9 (Berkeley) 5/14/95
 */


#ifndef _NFS_NFSNODE_H_
#define _NFS_NFSNODE_H_

#ifndef _NFS_NFS_H_
#include <nfs/nfs.h>
#endif

#include <sys/lock.h>

/*
 * Silly rename structure that hangs off the nfsnode until the name
 * can be removed by nfs_inactive()
 */
struct sillyrename {
	struct	ucred *s_cred;
	struct	vnode *s_dvp;
	long	s_namlen;
	char	s_name[24];
};

/*
 * The nfsnode is the nfs equivalent to ufs's inode. Any similarity
 * is purely coincidental.
 * There is a unique nfsnode allocated for each active file,
 * each current directory, each mounted-on file, text file, and the root.
 * An nfsnode is 'named' by its file handle. (nget/nfs_node.c)
 */
struct nfsnode {
	RB_ENTRY(nfsnode)	n_entry;	/* filehandle/node tree. */
	u_quad_t		n_size;		/* Current size of file */
	struct vattr		n_vattr;	/* Vnode attribute cache */
	time_t			n_attrstamp;	/* Attr. cache timestamp */
	struct timespec 	n_mtime;	/* Prev modify time. */
	time_t			n_ctime;	/* Prev create time. */
	nfsfh_t			*n_fhp;		/* NFS File Handle */
	struct vnode		*n_vnode;	/* associated vnode */
	struct lockf_state	*n_lockf;	/* Locking record of file */
	struct rrwlock		n_lock;		/* NFSnode lock */
	int			n_error;	/* Save write error value */
	union {
		struct timespec	nf_atim;	/* Special file times */
		nfsuint64	nd_cookieverf;	/* Cookie verifier (dir only) */
	} n_un1;
	union {
		struct timespec	nf_mtim;
		off_t		nd_direof;	/* Dir. EOF offset cache */
	} n_un2;
	struct sillyrename	*n_sillyrename;	/* Ptr to silly rename struct */
	short			n_fhsize;	/* size in bytes, of fh */
	short			n_flag;		/* Flag for locking.. */
	nfsfh_t			n_fh;		/* Small File Handle */
	time_t			n_accstamp;	/* Access cache timestamp */
	uid_t			n_accuid;	/* Last access requester */
	int			n_accmode;	/* Last mode requested */
	int			n_accerror;	/* Last returned error */
	struct ucred		*n_rcred;
	struct ucred		*n_wcred;

	off_t			n_pushedlo;	/* 1st blk in committed range */
	off_t			n_pushedhi;	/* Last block in range */
	off_t			n_pushlo;	/* 1st block in commit range */
	off_t			n_pushhi;	/* Last block in range */
	struct rwlock		n_commitlock;	/* Serialize commits */
	int			n_commitflags;
};

/*
 * Values for n_commitflags
 */
#define NFS_COMMIT_PUSH_VALID   0x0001          /* push range valid */
#define NFS_COMMIT_PUSHED_VALID 0x0002          /* pushed range valid */

#define n_atim		n_un1.nf_atim
#define n_mtim		n_un2.nf_mtim
#define n_cookieverf	n_un1.nd_cookieverf
#define n_direofoffset	n_un2.nd_direof

/*
 * Flags for n_flag
 */
#define	NFLUSHWANT	0x0001	/* Want wakeup from a flush in prog. */
#define	NFLUSHINPROG	0x0002	/* Avoid multiple calls to vinvalbuf() */
#define	NMODIFIED	0x0004	/* Might have a modified buffer in bio */
#define	NWRITEERR	0x0008	/* Flag write errors so close will know */
#define	NACC		0x0100	/* Special file accessed */
#define	NUPD		0x0200	/* Special file updated */
#define	NCHG		0x0400	/* Special file times changed */

#define NFS_INVALIDATE_ATTRCACHE(np)	((np)->n_attrstamp = 0)

/*
 * Convert between nfsnode pointers and vnode pointers
 */
#define VTONFS(vp)	((struct nfsnode *)(vp)->v_data)
#define NFSTOV(np)	((np)->n_vnode)

/*
 * Queue head for nfsiod's
 */
extern TAILQ_HEAD(nfs_bufqhead, buf) nfs_bufq;
extern uint32_t nfs_bufqlen, nfs_bufqmax;

#endif		/* _NFS_NFSNODE_H_ */