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, 101 insertions, 0 deletions

diff --git a/sys/fs/nfs/nfsv4_errstr.h b/sys/fs/nfs/nfsv4_errstr.h
new file mode 100644
index 0000000..4f6460d
--- /dev/null
+++ b/sys/fs/nfs/nfsv4_errstr.h
@@ -0,0 +1,101 @@
+/*-
+ * Copyright (c) 2009 Rick Macklem, University of Guelph
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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_NFSV4ERRSTR_H_
+#define	_NFS_NFSV4ERRSTR_H_
+
+/*
+ * Defines static storage in the C file, but I can't be bothered creating
+ * a library of one function for this, since it is only currently used by
+ * mount_newnfs.c.
+ */
+static const char *nfsv4_errstr[48] = {
+	"Illegal filehandle",
+	"Undefined NFSv4 err",
+	"READDIR cookie is stale",
+	"operation not supported",
+	"response limit exceeded",
+	"undefined server error",
+	"type invalid for CREATE",
+	"file busy - retry",
+	"nverify says attrs same",
+	"lock unavailable",
+	"lock lease expired",
+	"I/O failed due to lock",
+	"in grace period",
+	"filehandle expired",
+	"share reserve denied",
+	"wrong security flavor",
+	"clientid in use",
+	"resource exhaustion",
+	"filesystem relocated",
+	"current FH is not set",
+	"minor vers not supp",
+	"server has rebooted",
+	"server has rebooted",
+	"state is out of sync",
+	"incorrect stateid",
+	"request is out of seq",
+	"verify - attrs not same",
+	"lock range not supported",
+	"should be file/directory",
+	"no saved filehandle",
+	"some filesystem moved",
+	"recommended attr not sup",
+	"reclaim outside of grace",
+	"reclaim error at server",
+	"conflict on reclaim",
+	"XDR decode failed",
+	"file locks held at CLOSE",
+	"conflict in OPEN and I/O",
+	"owner translation bad",
+	"utf-8 char not supported",
+	"name not supported",
+	"lock range not supported",
+	"no atomic up/downgrade",
+	"undefined operation",
+	"file locking deadlock",
+	"open file blocks op",
+	"lockowner state revoked",
+	"callback path down"
+};
+
+/*
+ * Return the error string for the NFS4ERR_xxx. The pointers returned are
+ * static and must not be free'd.
+ */
+static const char *
+nfsv4_geterrstr(int errval)
+{
+
+	if (errval < NFSERR_BADHANDLE || errval > NFSERR_CBPATHDOWN)
+		return (NULL);
+	return (nfsv4_errstr[errval - NFSERR_BADHANDLE]);
+}
+
+#endif	/* _NFS_NFSV4ERRSTR_H_ */