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, 107 insertions, 0 deletions

diff --git a/sys/fs/nfs/nfsrvcache.h b/sys/fs/nfs/nfsrvcache.h
new file mode 100644
index 0000000..30f757a
--- /dev/null
+++ b/sys/fs/nfs/nfsrvcache.h
@@ -0,0 +1,107 @@
+/*-
+ * 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 _NFS_NFSRVCACHE_H_
+#define	_NFS_NFSRVCACHE_H_
+
+/*
+ * Definitions for the server recent request cache
+ */
+#define	NFSRVCACHE_MAX_SIZE	2048
+#define	NFSRVCACHE_MIN_SIZE	  64
+
+#define	NFSRVCACHE_HASHSIZE	20
+
+struct nfsrvcache {
+	LIST_ENTRY(nfsrvcache) rc_hash;		/* Hash chain */
+	TAILQ_ENTRY(nfsrvcache)	rc_lru;		/* UDP lru chain */
+	u_int32_t	rc_xid;			/* rpc id number */
+	time_t		rc_timestamp;		/* Time done */
+	union {
+		mbuf_t repmb;			/* Reply mbuf list OR */
+		int repstat;			/* Reply status */
+	} rc_un;
+	union {
+		struct {
+			union nethostaddr haddr; /* Host address */
+		} udp;
+		struct {
+			u_int64_t	sockref;
+			u_int32_t	len;
+			u_int32_t	tcpseq;
+			int16_t		refcnt;
+			u_int16_t	cksum;
+			time_t		cachetime;
+		} ot;
+	} rc_un2;
+	u_int16_t	rc_proc;		/* rpc proc number */
+	u_int16_t	rc_flag;		/* Flag bits */
+};
+
+#define	rc_reply	rc_un.repmb
+#define	rc_status	rc_un.repstat
+#define	rc_inet		rc_un2.udp.haddr.had_inet.s_addr
+#define	rc_inet6	rc_un2.udp.haddr.had_inet6
+#define	rc_haddr	rc_un2.udp.haddr
+#define	rc_sockref	rc_un2.ot.sockref
+#define	rc_tcpseq	rc_un2.ot.tcpseq
+#define	rc_refcnt	rc_un2.ot.refcnt
+#define	rc_reqlen	rc_un2.ot.len
+#define	rc_cksum	rc_un2.ot.cksum
+#define	rc_cachetime	rc_un2.ot.cachetime
+
+/* Return values */
+#define	RC_DROPIT		0
+#define	RC_REPLY		1
+#define	RC_DOIT			2
+
+/* Flag bits */
+#define	RC_LOCKED	0x0001
+#define	RC_WANTED	0x0002
+#define	RC_REPSTATUS	0x0004
+#define	RC_REPMBUF	0x0008
+#define	RC_UDP		0x0010
+#define	RC_INETIPV6	0x0020
+#define	RC_INPROG	0x0040
+#define	RC_TCPSEQ	0x0080
+#define	RC_NFSV2	0x0100
+#define	RC_NFSV3	0x0200
+#define	RC_NFSV4	0x0400
+#define	RC_NFSVERS	(RC_NFSV2 | RC_NFSV3 | RC_NFSV4)
+#define	RC_REFCNT	0x0800
+#define	RC_SAMETCPCONN	0x1000
+
+LIST_HEAD(nfsrvhashhead, nfsrvcache);
+
+#endif	/* _NFS_NFSRVCACHE_H_ */