nfsnode.h

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 */

#ifndef _NFSCLIENT_NFSNODE_H_
#define _NFSCLIENT_NFSNODE_H_

#include <sys/_task.h>
#if !defined(_NFSCLIENT_NFS_H_) && !defined(_KERNEL)
#include <nfs/nfs.h>
#endif

/*
 * Silly rename structure that hangs off the nfsnode until the name
 * can be removed by nfs_inactive()
 */
struct sillyrename {
	struct	task s_task;
	struct	ucred *s_cred;
	struct	vnode *s_dvp;
	int	(*s_removeit)(struct sillyrename *sp);
	long	s_namlen;
	char	s_name[32];
};

/*
 * This structure is used to save the logical directory offset to
 * NFS cookie mappings.
 * The mappings are stored in a list headed
 * by n_cookies, as required.
 * There is one mapping for each NFS_DIRBLKSIZ bytes of directory information
 * stored in increasing logical offset byte order.
 */
#define NFSNUMCOOKIES		31

struct nfsdmap {
	LIST_ENTRY(nfsdmap)	ndm_list;
	int			ndm_eocookie;
	union {
		nfsuint64	ndmu3_cookies[NFSNUMCOOKIES];
		uint64_t	ndmu4_cookies[NFSNUMCOOKIES];
	} ndm_un1;
};

#define ndm_cookies	ndm_un1.ndmu3_cookies
#define ndm4_cookies	ndm_un1.ndmu4_cookies

struct nfs_accesscache {
	u_int32_t		mode;		/* ACCESS mode cache */
	uid_t			uid;		/* credentials having mode */
	time_t			stamp;		/* mode cache timestamp */
};

/*
 * 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)
 * If this structure exceeds 256 bytes (it is currently 256 using 4.4BSD-Lite
 * type definitions), file handles of > 32 bytes should probably be split out
 * into a separate malloc()'d data structure. (Reduce the size of nfsfh_t by
 * changing the definition in nfsproto.h of NFS_SMALLFH.)
 * NB: Hopefully the current order of the fields is such that everything will
 *     be well aligned and, therefore, tightly packed.
 */
struct nfsnode {
	struct mtx 		n_mtx;		/* Protects all of these members */
	u_quad_t		n_size;		/* Current size of file */
	u_quad_t		n_brev;		/* Modify rev when cached */
	u_quad_t		n_lrev;		/* Modify rev for lease */
	struct vattr		n_vattr;	/* Vnode attribute cache */
	time_t			n_attrstamp;	/* Attr. cache timestamp */
	struct nfs_accesscache	n_accesscache[NFS_ACCESSCACHESIZE];
	struct timespec		n_mtime;	/* Prev modify time. */
	nfsfh_t			*n_fhp;		/* NFS File Handle */
	struct vnode		*n_vnode;	/* associated vnode */
	struct vnode		*n_dvp;		/* parent vnode */
	int			n_error;	/* Save write error value */
	union {
		struct timespec	nf_atim;	/* Special file times */
		nfsuint64	nd_cookieverf;	/* Cookie verifier (dir only) */
		u_char		nd4_cookieverf[NFSX_V4VERF];
	} n_un1;
	union {
		struct timespec	nf_mtim;
		off_t		nd_direof;	/* Dir. EOF offset cache */
	} n_un2;
	union {
		struct sillyrename *nf_silly;	/* Ptr to silly rename struct */
		LIST_HEAD(, nfsdmap) nd_cook;	/* cookies */
	} n_un3;
	short			n_fhsize;	/* size in bytes, of fh */
	short			n_flag;		/* Flag for locking.. */
	nfsfh_t			n_fh;		/* Small File Handle */
	u_char			*n_name;	/* leaf name, for v4 OPEN op */
	uint32_t		n_namelen;
	int			n_directio_opens;
	int                     n_directio_asyncwr;
	struct ucred		*n_writecred;	/* Cred. for putpages */
};

#define n_atim		n_un1.nf_atim
#define n_mtim		n_un2.nf_mtim
#define n_sillyrename	n_un3.nf_silly
#define n_cookieverf	n_un1.nd_cookieverf
#define n4_cookieverf	n_un1.nd4_cookieverf
#define n_direofoffset	n_un2.nd_direof
#define n_cookies	n_un3.nd_cook

/*
 * Flags for n_flag
 */
#define NFSYNCWAIT      0x0002  /* fsync waiting for all directio async writes
				  to drain */
#define	NMODIFIED	0x0004	/* Might have a modified buffer in bio */
#define	NWRITEERR	0x0008	/* Flag write errors so close will know */
/* 0x20, 0x40, 0x80 free */
#define	NACC		0x0100	/* Special file accessed */
#define	NUPD		0x0200	/* Special file updated */
#define	NCHG		0x0400	/* Special file times changed */
#define	NCREATED	0x0800	/* Opened by nfs_create() */
#define	NTRUNCATE	0x1000	/* Opened by nfs_setattr() */
#define	NSIZECHANGED	0x2000  /* File size has changed: need cache inval */
#define NNONCACHE	0x4000  /* Node marked as noncacheable */
#define NDIRCOOKIELK	0x8000	/* Lock to serialize access to directory cookies */

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

#define NFS_TIMESPEC_COMPARE(T1, T2)	(((T1)->tv_sec != (T2)->tv_sec) || ((T1)->tv_nsec != (T2)->tv_nsec))

/*
 * NFS iod threads can be in one of these two states once spawned.
 * NFSIOD_NOT_AVAILABLE - Cannot be assigned an I/O operation at this time.
 * NFSIOD_AVAILABLE - Available to be assigned an I/O operation.
 */
enum nfsiod_state {
	NFSIOD_NOT_AVAILABLE = 0,
	NFSIOD_AVAILABLE = 1,
};

/*
 * Queue head for nfsiod's
 */
extern TAILQ_HEAD(nfs_bufq, buf) nfs_bufq;
extern enum nfsiod_state nfs_iodwant[NFS_MAXASYNCDAEMON];
extern struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];

#if defined(_KERNEL)

extern	struct vop_vector	nfs_fifoops;
extern	struct vop_vector	nfs_vnodeops;
extern struct buf_ops buf_ops_nfs;

/*
 * Prototypes for NFS vnode operations
 */
int	nfs_getpages(struct vop_getpages_args *);
int	nfs_putpages(struct vop_putpages_args *);
int	nfs_write(struct vop_write_args *);
int	nfs_inactive(struct vop_inactive_args *);
int	nfs_reclaim(struct vop_reclaim_args *);

/* other stuff */
int	nfs_removeit(struct sillyrename *);
int	nfs_nget(struct mount *, nfsfh_t *, int, struct nfsnode **, int flags);
nfsuint64 *nfs_getcookie(struct nfsnode *, off_t, int);
void	nfs_invaldir(struct vnode *);
int	nfs_upgrade_vnlock(struct vnode *vp);
void	nfs_downgrade_vnlock(struct vnode *vp, int old_lock);
void	nfs_printf(const char *fmt, ...);

void nfs_dircookie_lock(struct nfsnode *np);
void nfs_dircookie_unlock(struct nfsnode *np);

#endif /* _KERNEL */

#endif