util-linux/util-linux-2.12-mount_base_nfsv4.patch

Add basic nfsv4 support

---

 util-linux-2.12-bfields/mount/Makefile     |    2 
 util-linux-2.12-bfields/mount/fstab.5      |    1 
 util-linux-2.12-bfields/mount/mount.8      |   75 ++++++
 util-linux-2.12-bfields/mount/mount.c      |   13 +
 util-linux-2.12-bfields/mount/nfs.5        |  200 +++++++++++++++++
 util-linux-2.12-bfields/mount/nfs4_mount.h |   82 +++++++
 util-linux-2.12-bfields/mount/nfs4mount.c  |  335 +++++++++++++++++++++++++++++
 util-linux-2.12-bfields/mount/nfsmount.c   |    5 
 util-linux-2.12-bfields/mount/sundries.h   |    2 
 util-linux-2.12-bfields/mount/umount.c     |    3 
 10 files changed, 710 insertions(+), 8 deletions(-)

Index: util-linux-ng-2.12r+git20070330/mount/fstab.5
===================================================================
--- util-linux-ng-2.12r+git20070330.orig/mount/fstab.5
+++ util-linux-ng-2.12r+git20070330/mount/fstab.5
@@ -115,6 +115,7 @@ of filesystem types, such as
 .IR msdos ,
 .IR ncpfs ,
 .IR nfs ,
+.IR nfs4 ,
 .IR ntfs ,
 .IR proc ,
 .IR qnx4 ,
Index: util-linux-ng-2.12r+git20070330/mount/mount.8
===================================================================
--- util-linux-ng-2.12r+git20070330.orig/mount/mount.8
+++ util-linux-ng-2.12r+git20070330/mount/mount.8
@@ -385,6 +385,7 @@ currently supported include:
 .IR msdos ,
 .IR ncpfs ,
 .IR nfs ,
+.IR nfs4 ,
 .IR ntfs ,
 .IR proc ,
 .IR qnx4 ,
@@ -422,7 +423,7 @@ For most types all the
 program has to do is issue a simple
 .IR mount (2)
 system call, and no detailed knowledge of the filesystem type is required.
-For a few types however (like nfs, cifs, smbfs, ncpfs) ad hoc code is
+For a few types however (like nfs, nfs4, cifs, smbfs, ncpfs) ad hoc code is
 necessary. The nfs ad hoc code is built in, but cifs, smbfs, and ncpfs
 have a separate mount program. In order to make it possible to
 treat all types in a uniform way, mount will execute the program
@@ -450,9 +451,10 @@ or, if that does not exist,
 All of the filesystem types listed there will be tried,
 except for those that are labeled "nodev" (e.g.,
 .IR devpts ,
-.I proc
+.IR proc ,
+.IR nfs ,
 and
-.IR nfs ).
+.IR nfs4 ).
 If
 .I /etc/filesystems
 ends in a line with a single * only, mount will read
@@ -1380,6 +1382,73 @@ Usually it just causes lots of trouble.
 .B nolock
 Do not use locking. Do not start lockd.
 
+.SH "Mount options for nfs4"
+Instead of a textual option string, parsed by the kernel, the
+.I nfs4
+file system expects a binary argument of type
+.IR "struct nfs4_mount_data" .
+The program
+.B mount
+itself parses the following options of the form `tag=value',
+and puts them in the structure mentioned:
+.BI rsize= n,
+.BI wsize= n,
+.BI timeo= n,
+.BI retrans= n,
+.BI acregmin= n,
+.BI acregmax= n,
+.BI acdirmin= n,
+.BI acdirmax= n,
+.BI actimeo= n,
+.BI retry= n,
+.BI port= n,
+.BI proto= n,
+.BI clientaddr= n,
+.BI sec= n.
+The option
+.BI addr= n
+is accepted but ignored.
+Also the following Boolean options, possibly preceded by
+.B no
+are recognized:
+.BR bg ,
+.BR fg ,
+.BR soft ,
+.BR hard ,
+.BR intr ,
+.BR cto ,
+.BR ac ,
+For details, see
+.BR nfs (5).
+
+Especially useful options include
+.TP
+.B rsize=32768,wsize=32768
+This will make your NFS connection faster than with the default
+buffer size of 4096.
+.TP
+.B hard
+The program accessing a file on a NFS mounted file system will hang
+when the server crashes. The process cannot be interrupted or
+killed unless you also specify
+.BR intr .
+When the NFS server is back online the program will continue undisturbed
+from where it was. This is probably what you want.
+.TP
+.B soft
+This option allows the kernel to time out if the NFS server is not
+responding for some time. The time can be
+specified with
+.BR timeo=time .
+This timeout value is expressed in tenths of a second.
+The
+.BR soft
+option might be useful if your NFS server sometimes doesn't respond
+or will be rebooted while some process tries to get a file from the server.
+Avoid using this option with
+.BR proto=udp
+or with a short timeout.
+
 .SH "Mount options for ntfs"
 .TP
 .BI iocharset= name
Index: util-linux-ng-2.12r+git20070330/mount/mount.c
===================================================================
--- util-linux-ng-2.12r+git20070330.orig/mount/mount.c
+++ util-linux-ng-2.12r+git20070330/mount/mount.c
@@ -860,6 +860,19 @@ try_mount_one (const char *spec0, const 
       if (res)
 	  goto out;
   }
+#ifdef HAVE_NFS
+  /*
+   * NFSv4 support
+   */
+  if (!fake && types && streq (types, "nfs4")) {
+    mnt_err = nfs4mount(spec, node, &flags, &extra_opts, &mount_opts, bg);
+    if (mnt_err)
+      return mnt_err;
+#else
+    die (EX_SOFTWARE, _("mount: this version was compiled "
+	              "without support for the type `nfs4'"));
+#endif
+  }
 
   /*
    * Call mount.TYPE for types that require a separate mount program.
Index: util-linux-ng-2.12r+git20070330/mount/nfs4mount.c
===================================================================
--- /dev/null
+++ util-linux-ng-2.12r+git20070330/mount/nfs4mount.c
@@ -0,0 +1,335 @@
+/*
+ * nfs4mount.c -- Linux NFS mount
+ * Copyright (C) 2002 Trond Myklebust <trond.myklebust@fys.uio.no>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * Note: this file based on the original nfsmount.c
+ */
+
+#include "../config.h"
+
+#include <linux/posix_types.h>
+#include <asm/posix_types.h>
+#undef __FD_CLR
+#undef __FD_SET
+#undef __FD_ISSET
+#undef __FD_ZERO
+
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <netdb.h>
+#include <time.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/utsname.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "sundries.h"
+
+#include "mount_constants.h"
+#include "nfs4_mount.h"
+
+#include "nls.h"
+
+#ifndef NFS_PORT
+#define NFS_PORT 2049
+#endif
+
+static int parse_devname(char *hostdir, char **hostname, char **dirname)
+{
+	char *s;
+
+	if (!(s = strchr(hostdir, ':'))) {
+		fprintf(stderr,
+			_("mount: "
+			  "directory to mount not in host:dir format\n"));
+		return -1;
+	}
+	*hostname = hostdir;
+	*dirname = s + 1;
+	*s = '\0';
+	/* Ignore all but first hostname in replicated mounts
+	   until they can be fully supported. (mack@sgi.com) */
+	if ((s = strchr(hostdir, ','))) {
+		*s = '\0';
+		fprintf(stderr,
+			_("mount: warning: "
+			  "multiple hostnames not supported\n"));
+	}
+	return 0;
+}
+
+static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr)
+{
+	struct hostent *hp;
+	addr->sin_family = AF_INET;
+
+	if (inet_aton(hostname, &addr->sin_addr))
+		return 0;
+	if ((hp = gethostbyname(hostname)) == NULL) {
+		fprintf(stderr, _("mount: can't get address for %s\n"),
+			hostname);
+		return -1;
+	}
+	if (hp->h_length > sizeof(struct in_addr)) {
+		fprintf(stderr,
+			_("mount: got bad hp->h_length\n"));
+		hp->h_length = sizeof(struct in_addr);
+	}
+	memcpy(&addr->sin_addr, hp->h_addr, hp->h_length);
+	return 0;
+}
+
+static int get_my_ipv4addr(char *ip_addr, int len)
+{
+	char myname[1024];
+	struct sockaddr_in myaddr;
+
+	if (gethostname(myname, sizeof(myname))) {
+		fprintf(stderr, _("mount: can't determine client address\n"));
+		return -1;
+	}
+	if (fill_ipv4_sockaddr(myname, &myaddr))
+		return -1;
+	snprintf(ip_addr, len, "%s", inet_ntoa(myaddr.sin_addr));
+	ip_addr[len-1] = '\0';
+	return 0;
+}
+
+int nfs4mount(const char *spec, const char *node, int *flags,
+	      char **extra_opts, char **mount_opts,
+	      int running_bg)
+{
+	static struct nfs4_mount_data data;
+	static char hostdir[1024];
+	static char ip_addr[16] = "127.0.0.1";
+	static struct sockaddr_in server_addr;
+	static int pseudoflavour = 0;
+
+	char *hostname, *dirname, *old_opts;
+	char new_opts[1024];
+	char *opt, *opteq;
+	char *s;
+	int val;
+	int bg, soft, intr;
+	int nocto, noac;
+	int retry;
+	int retval;
+
+	retval = EX_FAIL;
+	if (strlen(spec) >= sizeof(hostdir)) {
+		fprintf(stderr, _("mount: "
+				  "excessively long host:dir argument\n"));
+		goto fail;
+	}
+	strcpy(hostdir, spec);
+	if (parse_devname(hostdir, &hostname, &dirname))
+		goto fail;
+
+	if (fill_ipv4_sockaddr(hostname, &server_addr))
+		goto fail;
+	if (get_my_ipv4addr(ip_addr, sizeof(ip_addr)))
+		goto fail;
+
+	/* add IP address to mtab options for use when unmounting */
+	s = inet_ntoa(server_addr.sin_addr);
+	old_opts = *extra_opts;
+	if (!old_opts)
+		old_opts = "";
+	if (strlen(old_opts) + strlen(s) + 10 >= sizeof(new_opts)) {
+		fprintf(stderr, _("mount: "
+				  "excessively long option argument\n"));
+		goto fail;
+	}
+	snprintf(new_opts, sizeof(new_opts), "%s%saddr=%s",
+		 old_opts, *old_opts ? "," : "", s);
+	*extra_opts = xstrdup(new_opts);
+
+	/* Set default options.
+	 * rsize/wsize and timeo are left 0 in order to
+	 * let the kernel decide.
+	 */
+	memset(&data, 0, sizeof(data));
+	data.retrans	= 3;
+	data.acregmin	= 3;
+	data.acregmax	= 60;
+	data.acdirmin	= 30;
+	data.acdirmax	= 60;
+	data.proto	= IPPROTO_TCP;
+
+	bg = 0;
+	soft = 0;
+	intr = 0;
+	nocto = 0;
+	noac = 0;
+	retry = 10000;		/* 10000 minutes ~ 1 week */
+
+	/*
+	 * NFSv4 specifies that the default port should be 2049
+	 */
+	server_addr.sin_port = htons(NFS_PORT);
+
+	/* parse options */
+
+	for (opt = strtok(old_opts, ","); opt; opt = strtok(NULL, ",")) {
+		if ((opteq = strchr(opt, '='))) {
+			val = atoi(opteq + 1);
+			*opteq = '\0';
+			if (!strcmp(opt, "rsize"))
+				data.rsize = val;
+			else if (!strcmp(opt, "wsize"))
+				data.wsize = val;
+			else if (!strcmp(opt, "timeo"))
+				data.timeo = val;
+			else if (!strcmp(opt, "retrans"))
+				data.retrans = val;
+			else if (!strcmp(opt, "acregmin"))
+				data.acregmin = val;
+			else if (!strcmp(opt, "acregmax"))
+				data.acregmax = val;
+			else if (!strcmp(opt, "acdirmin"))
+				data.acdirmin = val;
+			else if (!strcmp(opt, "acdirmax"))
+				data.acdirmax = val;
+			else if (!strcmp(opt, "actimeo")) {
+				data.acregmin = val;
+				data.acregmax = val;
+				data.acdirmin = val;
+				data.acdirmax = val;
+			}
+			else if (!strcmp(opt, "retry"))
+				retry = val;
+			else if (!strcmp(opt, "port"))
+				server_addr.sin_port = htons(val);
+			else if (!strcmp(opt, "proto")) {
+				if (!strncmp(opteq+1, "tcp", 3))
+					data.proto = IPPROTO_TCP;
+				else if (!strncmp(opteq+1, "udp", 3))
+					data.proto = IPPROTO_UDP;
+				else
+					printf(_("Warning: Unrecognized proto= option.\n"));
+			} else if (!strcmp(opt, "clientaddr")) {
+				if (strlen(opteq+1) >= sizeof(ip_addr))
+					printf(_("Invalid client address %s"),
+								opteq+1);
+				strncpy(ip_addr,opteq+1, sizeof(ip_addr));
+				ip_addr[sizeof(ip_addr)-1] = '\0';
+			} else if (!strcmp(opt, "sec")) {
+				if (!strcmp(opteq+1, "krb5"))
+					pseudoflavour = 390003;
+				else if (!strcmp(opteq+1, "krb5i"))
+					pseudoflavour = 390004;
+				else if (!strcmp(opteq+1, "krb5p"))
+					pseudoflavour = 390005;
+				else if (!strcmp(opteq+1, "lipkey"))
+					pseudoflavour = 390006;
+				else if (!strcmp(opteq+1, "lipkey-i"))
+					pseudoflavour = 390007;
+				else if (!strcmp(opteq+1, "lipkey-p"))
+					pseudoflavour = 390008;
+				else if (!strcmp(opteq+1, "spkm3"))
+					pseudoflavour = 390009;
+				else if (!strcmp(opteq+1, "spkm3i"))
+					pseudoflavour = 390010;
+				else if (!strcmp(opteq+1, "spkm3p"))
+					pseudoflavour = 390011;
+				else {
+					printf(_("unknown security type %s\n"),
+							opteq+1);
+					goto fail;
+				}
+			} else if (!strcmp(opt, "addr")) {
+				/* ignore */;
+			} else {
+				printf(_("unknown nfs mount parameter: "
+					 "%s=%d\n"), opt, val);
+				goto fail;
+			}
+		} else {
+			val = 1;
+			if (!strncmp(opt, "no", 2)) {
+				val = 0;
+				opt += 2;
+			}
+			if (!strcmp(opt, "bg"))
+				bg = val;
+			else if (!strcmp(opt, "fg"))
+				bg = !val;
+			else if (!strcmp(opt, "soft"))
+				soft = val;
+			else if (!strcmp(opt, "hard"))
+				soft = !val;
+			else if (!strcmp(opt, "intr"))
+				intr = val;
+			else if (!strcmp(opt, "cto"))
+				nocto = !val;
+			else if (!strcmp(opt, "ac"))
+				noac = !val;
+			else {
+				if (!sloppy) {
+					printf(_("unknown nfs mount option: "
+						 "%s%s\n"), val ? "" : "no", opt);
+					goto fail;
+				}
+			}
+		}
+	}
+
+	data.flags = (soft ? NFS4_MOUNT_SOFT : 0)
+		| (intr ? NFS4_MOUNT_INTR : 0)
+		| (nocto ? NFS4_MOUNT_NOCTO : 0)
+		| (noac ? NFS4_MOUNT_NOAC : 0);
+
+	if (pseudoflavour != 0) {
+		data.auth_flavourlen = 1;
+		data.auth_flavours = &pseudoflavour;
+	}
+
+	data.client_addr.data = ip_addr;
+	data.client_addr.len = strlen(ip_addr);
+
+	data.mnt_path.data = dirname;
+	data.mnt_path.len = strlen(dirname);
+
+	data.hostname.data = hostname;
+	data.hostname.len = strlen(hostname);
+	data.host_addr = (struct sockaddr *)&server_addr;
+	data.host_addrlen = sizeof(server_addr);
+
+#ifdef NFS_MOUNT_DEBUG
+	printf("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
+	       data.rsize, data.wsize, data.timeo, data.retrans);
+	printf("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n",
+	       data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
+	printf("port = %d, bg = %d, retry = %d, flags = %.8x\n",
+	       ntohs(server_addr.sin_port), bg, retry, data.flags);
+	printf("soft = %d, intr = %d, nocto = %d, noac = %d\n",
+	       (data.flags & NFS4_MOUNT_SOFT) != 0,
+	       (data.flags & NFS4_MOUNT_INTR) != 0,
+	       (data.flags & NFS4_MOUNT_NOCTO) != 0,
+	       (data.flags & NFS4_MOUNT_NOAC) != 0);
+	printf("proto = %s\n", (data.proto == IPPROTO_TCP) ? "tcp" : "udp");
+#endif
+
+	data.version = NFS4_MOUNT_VERSION;
+
+	*mount_opts = (char *) &data;
+	/* clean up */
+	return 0;
+
+fail:
+	return retval;
+}
Index: util-linux-ng-2.12r+git20070330/mount/nfs4_mount.h
===================================================================
--- /dev/null
+++ util-linux-ng-2.12r+git20070330/mount/nfs4_mount.h
@@ -0,0 +1,82 @@
+#ifndef _LINUX_NFS4_MOUNT_H
+#define _LINUX_NFS4_MOUNT_H
+
+/*
+ *  linux/include/linux/nfs4_mount.h
+ *
+ *  Copyright (C) 2002  Trond Myklebust
+ *
+ *  structure passed from user-space to kernel-space during an nfsv4 mount
+ */
+
+/*
+ * WARNING!  Do not delete or change the order of these fields.  If
+ * a new field is required then add it to the end.  The version field
+ * tracks which fields are present.  This will ensure some measure of
+ * mount-to-kernel version compatibility.  Some of these aren't used yet
+ * but here they are anyway.
+ */
+#define NFS4_MOUNT_VERSION	1
+
+struct nfs_string {
+	unsigned int len;
+	const char* data;
+};
+
+struct nfs4_mount_data {
+	int version;				/* 1 */
+	int flags;				/* 1 */
+	int rsize;				/* 1 */
+	int wsize;				/* 1 */
+	int timeo;				/* 1 */
+	int retrans;				/* 1 */
+	int acregmin;				/* 1 */
+	int acregmax;				/* 1 */
+	int acdirmin;				/* 1 */
+	int acdirmax;				/* 1 */
+
+	/* see the definition of 'struct clientaddr4' in RFC3010 */
+	struct nfs_string client_addr;		/* 1 */
+
+	/* Mount path */
+	struct nfs_string mnt_path;		/* 1 */
+
+	/* Server details */
+	struct nfs_string hostname;		/* 1 */
+	/* Server IP address */
+	unsigned int host_addrlen;		/* 1 */
+	struct sockaddr* host_addr;		/* 1 */
+
+	/* Transport protocol to use */
+	int proto;				/* 1 */
+
+	/* Pseudo-flavours to use for authentication. See RFC2623 */
+	int auth_flavourlen;			/* 1 */
+	int *auth_flavours;			/* 1 */
+};
+
+/* bits in the flags field */
+/* Note: the fields that correspond to existing NFSv2/v3 mount options
+ * 	 should mirror the values from include/linux/nfs_mount.h
+ */
+
+#define NFS4_MOUNT_SOFT		0x0001	/* 1 */
+#define NFS4_MOUNT_INTR		0x0002	/* 1 */
+#define NFS4_MOUNT_NOCTO	0x0010	/* 1 */
+#define NFS4_MOUNT_NOAC		0x0020	/* 1 */
+#define NFS4_MOUNT_STRICTLOCK	0x1000	/* 1 */
+#define NFS4_MOUNT_FLAGMASK	0xFFFF
+
+/* pseudoflavors: */
+
+#define RPC_AUTH_GSS_KRB5       390003
+#define RPC_AUTH_GSS_KRB5I      390004
+#define RPC_AUTH_GSS_KRB5P      390005
+#define RPC_AUTH_GSS_LKEY       390006
+#define RPC_AUTH_GSS_LKEYI      390007
+#define RPC_AUTH_GSS_LKEYP      390008
+#define RPC_AUTH_GSS_SPKM       390009
+#define RPC_AUTH_GSS_SPKMI      390010
+#define RPC_AUTH_GSS_SPKMP      390011
+
+#endif
Index: util-linux-ng-2.12r+git20070330/mount/nfs.5
===================================================================
--- util-linux-ng-2.12r+git20070330.orig/mount/nfs.5
+++ util-linux-ng-2.12r+git20070330/mount/nfs.5
@@ -3,7 +3,7 @@
 .\" patches. "
 .TH NFS 5 "20 November 1993" "Linux 0.99" "Linux Programmer's Manual"
 .SH NAME
-nfs \- nfs fstab format and options
+nfs \- nfs and nfs4 fstab format and options
 .SH SYNOPSIS
 .B /etc/fstab
 .SH DESCRIPTION
@@ -17,14 +17,51 @@ the local directory that is the mount po
 and the NFS specific options that control
 the way the filesystem is mounted.
 .P
-Here is an example from an \fI/etc/fstab\fP file from an NFS mount.
+Three different versions of the NFS protocol are
+supported by the Linux NFS client:
+NFS version 2, NFS version 3, and NFS version 4.
+To mount via NFS version 2, use the
+.BR nfs
+file system type and specify
+.BR nfsvers=2 .
+Version 2 is the default protocol version for the
+.BR nfs
+file system type when
+.BR nfsvers=
+is not specified on the mount command.
+To mount via NFS version 3, use the
+.BR nfs
+file system type and specify
+.BR nfsvers=3 .
+To mount via NFS version 4, use the
+.BR nfs4
+file system type.
+The
+.BR nfsvers=
+keyword is not supported for the
+.BR nfs4
+file system type.
+.P
+These file system types share similar mount options;
+the differences are listed below.
+.P
+Here is an example from an \fI/etc/fstab\fP file for an NFSv2 mount
+over UDP.
 .sp
 .nf
 .ta 2.5i +0.75i +0.75i +1.0i
 server:/usr/local/pub	/pub	nfs	rsize=8192,wsize=8192,timeo=14,intr
 .fi
+.P
+Here is an example for an NFSv4 mount over TCP using Kerberos
+5 mutual authentication.
+.sp
+.nf
+.ta 2.5i +0.75i +0.75i +1.0i
+server:/usr/local/pub	/pub	nfs4	proto=tcp,sec=krb5,hard,intr
+.fi
 .DT
-.SS Options
+.SS Options for the nfs file system type
 .TP 1.5i
 .I rsize=n
 The number of bytes NFS uses when reading files from an NFS server.
@@ -217,6 +254,163 @@ which are otherwise used to manipulate A
 All of the non-value options have corresponding nooption forms.
 For example, nointr means don't allow file operations to be
 interrupted.
+.SS Options for the nfs4 file system type
+.TP 1.5i
+.I rsize=n
+The number of bytes NFS uses when reading files from an NFS server.
+The default value is dependent on the kernel, currently 4096 bytes.
+(However, throughput is improved greatly by asking for
+.IR rsize=32768 .)
+This value is negotiated with the server.
+.TP 1.5i
+.I wsize=n
+The number of bytes NFS uses when writing files to an NFS server.
+The default value is dependent on the kernel, currently 4096 bytes.
+(However, throughput is improved greatly by asking for
+.IR wsize=32768 .)
+This value is negotiated with the server.
+.TP 1.5i
+.I timeo=n
+The value in tenths of a second before sending the
+first retransmission after an RPC timeout.
+The default value depends on whether
+.IR proto=udp
+or
+.IR proto=tcp
+is in effect (see below).
+The default value for UDP is 7 tenths of a second.
+The default value for TCP is 60 seconds.
+After the first timeout,
+the timeout is doubled after each successive timeout until a maximum
+timeout of 60 seconds is reached or the enough retransmissions
+have occured to cause a major timeout.  Then, if the filesystem
+is hard mounted, each new timeout cascade restarts at twice the
+initial value of the previous cascade, again doubling at each
+retransmission.  The maximum timeout is always 60 seconds.
+.TP 1.5i
+.I retrans=n
+The number of minor timeouts and retransmissions that must occur before
+a major timeout occurs.  The default is 5 timeouts for
+.IR proto=udp
+and 2 timeouts for
+.IR proto=tcp .
+When a major timeout
+occurs, the file operation is either aborted or a "server not responding"
+message is printed on the console.
+.TP 1.5i
+.I acregmin=n
+The minimum time in seconds that attributes of a regular file should
+be cached before requesting fresh information from a server.
+The default is 3 seconds.
+.TP 1.5i
+.I acregmax=n
+The maximum time in seconds that attributes of a regular file can
+be cached before requesting fresh information from a server.
+The default is 60 seconds.
+.TP 1.5i
+.I acdirmin=n
+The minimum time in seconds that attributes of a directory should
+be cached before requesting fresh information from a server.
+The default is 30 seconds.
+.TP 1.5i
+.I acdirmax=n
+The maximum time in seconds that attributes of a directory can
+be cached before requesting fresh information from a server.
+The default is 60 seconds.
+.TP 1.5i
+.I actimeo=n
+Using actimeo sets all of
+.I acregmin,
+.I acregmax,
+.I acdirmin,
+and
+.I acdirmax
+to the same value.
+There is no default value.
+.TP 1.5i
+.I retry=n
+The number of minutes to retry an NFS mount operation
+in the foreground or background before giving up.
+The default value is 10000 minutes, which is roughly one week.
+.TP 1.5i
+.I port=n
+The numeric value of the port to connect to the NFS server on.
+If the port number is 0 (the default) then query the
+remote host's portmapper for the port number to use.
+If the remote host's NFS daemon is not registered with
+its portmapper, the standard NFS port number 2049 is
+used instead.
+.TP 1.5i
+.I proto=n
+Mount the NFS filesystem using a specific network protocol
+instead of the default UDP protocol.
+Many NFS version 4 servers only support TCP.
+Valid protocol types are
+.IR udp
+and
+.IR tcp .
+.TP 1.5i
+.I clientaddr=n
+On a multi-homed client, this
+causes the client to use a specific callback address when
+communicating with an NFS version 4 server.
+This option is currently ignored.
+.TP 1.5i
+.I sec=n
+Specify an advanced security mechanism for this file system.
+To use Kerberos 5 mutual authentication, specify
+.IR krb5 .
+Kerberos 5 integrity checking is specified with
+.IR krb5i ,
+and Kerberos 5 privacy is specified with
+.IR krb5p .
+Other security mechanisms may become available in the future.
+.TP 1.5i
+.I bg
+If an NFS mount attempt times out, retry the mount
+in the background.
+After a mount operation is backgrounded, all subsequent mounts
+on the same NFS server will be backgrounded immediately, without
+first attempting the mount.
+A missing mount point is treated as a timeout,
+to allow for nested NFS mounts.
+.TP 1.5i
+.I fg
+If the first NFS mount attempt times out, retry the mount
+in the foreground.
+This is the complement of the
+.I bg
+option, and also the default behavior.
+.TP 1.5i
+.I soft
+If an NFS file operation has a major timeout then report an I/O error to
+the calling program.
+The default is to continue retrying NFS file operations indefinitely.
+.TP 1.5i
+.I hard
+If an NFS file operation has a major timeout then report
+"server not responding" on the console and continue retrying indefinitely.
+This is the default.
+.TP 1.5i
+.I intr
+If an NFS file operation has a major timeout and it is hard mounted,
+then allow signals to interupt the file operation and cause it to
+return EINTR to the calling program.  The default is to not
+allow file operations to be interrupted.
+.TP 1.5i
+.I nocto
+Suppress the retrieval of new attributes when creating a file.
+.TP 1.5i
+.I noac
+Disable attribute caching, and force synchronous writes.
+This extracts a
+server performance penalty but it allows two different NFS clients
+to get reasonable good results when both clients are actively
+writing to common filesystem on the server.
+.P
+All of the non-value options have corresponding nooption forms.
+For example, nointr means don't allow file operations to be
+interrupted.
 .SH FILES
 .I /etc/fstab
 .SH "SEE ALSO"
Index: util-linux-ng-2.12r+git20070330/mount/sundries.h
===================================================================
--- util-linux-ng-2.12r+git20070330.orig/mount/sundries.h
+++ util-linux-ng-2.12r+git20070330/mount/sundries.h
@@ -40,6 +40,8 @@ void die (int errcode, const char *fmt, 
 
 int nfsmount (const char *spec, const char *node, int *flags,
 	      char **orig_opts, char **opt_args, int *version, int running_bg);
+int nfs4mount (const char *spec, const char *node, int *flags,
+		char **orig_opts, char **opt_args, int running_bg);
 
 /* exit status - bits below are ORed */
 #define EX_USAGE	1	/* incorrect invocation or permission */
Index: util-linux-ng-2.12r+git20070330/mount/umount.c
===================================================================
--- util-linux-ng-2.12r+git20070330.orig/mount/umount.c
+++ util-linux-ng-2.12r+git20070330/mount/umount.c
@@ -88,6 +88,9 @@ int verbose = 0;
 /* True if ruid != euid.  */
 int suid = 0;
 
+/* Needed by nfs4mount.c */
+int sloppy = 0;
+
 /*
  * check_special_umountprog()
  *	If there is a special umount program for this type, exec it.
Index: util-linux-ng-2.12r+git20070330/mount/Makefile.am
===================================================================
--- util-linux-ng-2.12r+git20070330.orig/mount/Makefile.am
+++ util-linux-ng-2.12r+git20070330/mount/Makefile.am
@@ -17,7 +17,7 @@ MNTHDRS = fstab.h linux_fs.h mount_mnten
 mount_SOURCES = mount.c fstab.c sundries.c xmalloc.c realpath.c mount_mntent.c \
 	get_label_uuid.c mount_by_label.c mount_blkid.c mount_guess_fstype.c \
 	getusername.c \
-	nfsmount.c nfsmount_xdr.c nfsmount_clnt.c \
+	nfsmount.c nfsmount_xdr.c nfsmount_clnt.c nfs4mount.c \
 	lomount.c \
 	$(MNTHDRS)