Add the experimental nfs subtree to the kernel, that includes

	support for NFSv4 as well as NFSv2 and 3.
	It lives in 3 subdirs under sys/fs:
	nfs - functions that are common to the client and server
	nfsclient - a mutation of sys/nfsclient that call generic functions
	to do RPCs and handle state. As such, it retains the
	buffer cache handling characteristics and vnode semantics that
	are found in sys/nfsclient, for the most part.
	nfsserver - the server. It includes a DRC designed specifically for
	NFSv4, that is used instead of the generic DRC in sys/rpc.
	The build glue will be checked in later, so at this point, it
	consists of 3 new subdirs that should not affect kernel building.

Approved by:	kib (mentor)

1 files changed, 201 insertions, 0 deletions

diff --git a/sys/fs/nfsclient/nfsnode.h b/sys/fs/nfsclient/nfsnode.h
new file mode 100644
index 0000000..c0610c9
--- /dev/null
+++ b/sys/fs/nfsclient/nfsnode.h
@@ -0,0 +1,201 @@
+/*-
+ * 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.
+ * 4. 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _NFSCLIENT_NFSNODE_H_
+#define	_NFSCLIENT_NFSNODE_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[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
+
+#define	n_ac_ts_tid		n_ac_ts.nfs_ac_ts_tid
+#define	n_ac_ts_pid		n_ac_ts.nfs_ac_ts_pid
+#define	n_ac_ts_syscalls	n_ac_ts.nfs_ac_ts_syscalls
+
+struct nfs_attrcache_timestamp {
+	lwpid_t		nfs_ac_ts_tid;
+	pid_t		nfs_ac_ts_pid;
+	unsigned long	nfs_ac_ts_syscalls;	
+};
+
+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 nfsvattr		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. */
+	time_t			n_ctime;	/* Prev create time. */
+	time_t			n_dmtime;	/* Prev dir modify time. */
+	time_t			n_expiry;	/* Lease expiry time */
+	struct nfsfh		*n_fhp;		/* NFS File Handle */
+	struct vnode		*n_vnode;	/* associated vnode */
+	struct vnode		*n_dvp;		/* parent vnode */
+	struct lockf		*n_lockf;	/* Locking record of file */
+	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_VERF];
+	} 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 */
+	u_int32_t		n_flag;		/* Flag for locking.. */
+	int			n_directio_opens;
+	int                     n_directio_asyncwr;
+	struct nfs_attrcache_timestamp n_ac_ts;
+	u_int64_t		 n_change;	/* old Change attribute */
+	struct nfsv4node	*n_v4;		/* extra V4 stuff */
+};
+
+#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	NDIRCOOKIELK	0x00000001  /* Lock to serialize access to directory cookies */
+#define	NFSYNCWAIT      0x00000002  /* fsync waiting for all directio async
+				  writes to drain */
+#define	NMODIFIED	0x00000004  /* Might have a modified buffer in bio */
+#define	NWRITEERR	0x00000008  /* Flag write errors so close will know */
+#define	NCREATED	0x00000010  /* Opened by nfs_create() */
+#define	NTRUNCATE	0x00000020  /* Opened by nfs_setattr() */
+#define	NSIZECHANGED	0x00000040  /* File size has changed: need cache inval */
+#define	NNONCACHE	0x00000080  /* Node marked as noncacheable */
+#define	NACC		0x00000100  /* Special file accessed */
+#define	NUPD		0x00000200  /* Special file updated */
+#define	NCHG		0x00000400  /* Special file times changed */
+#define	NDELEGMOD	0x00000800  /* Modified delegation */
+#define	NDELEGRECALL	0x00001000  /* Recall in progress */
+#define	NREMOVEINPROG	0x00002000  /* Remove in progress */
+#define	NREMOVEWANT	0x00004000  /* Want notification that remove is done */
+#define	NLOCK		0x00008000  /* Sleep lock the node */
+#define	NLOCKWANT	0x00010000  /* Want the sleep lock */
+
+/*
+ * 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))
+
+#if defined(_KERNEL)
+
+/*
+ * Prototypes for NFS vnode operations
+ */
+int	ncl_getpages(struct vop_getpages_args *);
+int	ncl_putpages(struct vop_putpages_args *);
+int	ncl_write(struct vop_write_args *);
+int	ncl_inactive(struct vop_inactive_args *);
+int	ncl_reclaim(struct vop_reclaim_args *);
+
+/* other stuff */
+int	ncl_removeit(struct sillyrename *, struct vnode *);
+int	ncl_nget(struct mount *, u_int8_t *, int, struct nfsnode **);
+nfsuint64 *ncl_getcookie(struct nfsnode *, off_t, int);
+void	ncl_invaldir(struct vnode *);
+int	ncl_upgrade_vnlock(struct vnode *);
+void	ncl_downgrade_vnlock(struct vnode *, int);
+void	ncl_printf(const char *, ...);
+void	ncl_dircookie_lock(struct nfsnode *);
+void	ncl_dircookie_unlock(struct nfsnode *);
+
+#endif /* _KERNEL */
+
+#endif	/* _NFSCLIENT_NFSNODE_H_ */