Adding upstream version 1:2.6.4.upstream/1%2.6.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 2935 insertions, 0 deletions

diff --git a/utils/exportfs/Makefile.am b/utils/exportfs/Makefile.am
new file mode 100644
index 0000000..7f8ce9f
--- /dev/null
+++ b/utils/exportfs/Makefile.am
@@ -0,0 +1,18 @@
+## Process this file with automake to produce Makefile.in
+
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+man7_MANS	= nfsd.man
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+
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+exportfs_SOURCES = exportfs.c
+exportfs_LDADD = ../../support/export/libexport.a \
+	       	 ../../support/nfs/libnfs.la \
+		 ../../support/misc/libmisc.a \
+		 ../../support/reexport/libreexport.a \
+		 $(LIBWRAP) $(LIBNSL) $(LIBPTHREAD)
+
+exportfs_CPPFLAGS = $(AM_CPPFLAGS) $(CPPFLAGS) -I$(top_srcdir)/support/reexport
+
+MAINTAINERCLEANFILES = Makefile.in
diff --git a/utils/exportfs/Makefile.in b/utils/exportfs/Makefile.in
new file mode 100644
index 0000000..3fd8dc0
--- /dev/null
+++ b/utils/exportfs/Makefile.in
@@ -0,0 +1,920 @@
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
new file mode 100644
index 0000000..b03a047
--- /dev/null
+++ b/utils/exportfs/exportfs.c
@@ -0,0 +1,768 @@
+/*
+ * utils/exportfs/exportfs.c
+ *
+ * Export file systems to knfsd
+ *
+ * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
+ *
+ * Extensive changes, 1999, Neil Brown <neilb@cse.unsw.edu.au>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/vfs.h>
+#include <sys/stat.h>
+#include <sys/file.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <getopt.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <errno.h>
+#include <limits.h>
+#include <time.h>
+
+#define INT_TO_LONG_THRESHOLD_SECS (INT_MAX - (60 * 60 * 24))
+
+#include "sockaddr.h"
+#include "misc.h"
+#include "nfsd_path.h"
+#include "nfslib.h"
+#include "exportfs.h"
+#include "xlog.h"
+#include "conffile.h"
+#include "reexport.h"
+
+static void	export_all(int verbose);
+static void	exportfs(char *arg, char *options, int verbose);
+static void	unexportfs(char *arg, int verbose);
+static void	dump(int verbose, int export_format);
+static void	usage(const char *progname, int n);
+static void	validate_export(nfs_export *exp);
+static int	matchhostname(const char *hostname1, const char *hostname2);
+static void grab_lockfile(void);
+static void release_lockfile(void);
+
+static const char *lockfile = EXP_LOCKFILE;
+static int _lockfd = -1;
+
+/*
+ * If we aren't careful, changes made by exportfs can be lost
+ * when multiple exports process run at once:
+ *
+ *	exportfs process 1	exportfs process 2
+ *	------------------------------------------
+ *	reads etab version A	reads etab version A
+ *	adds new export B	adds new export C
+ *	writes A+B		writes A+C
+ *
+ * The locking in support/export/xtab.c will prevent mountd from
+ * seeing a partially written version of etab, and will prevent
+ * the two writers above from writing simultaneously and
+ * corrupting etab, but to prevent problems like the above we
+ * need these additional lockfile() routines.
+ */
+static void
+grab_lockfile(void)
+{
+	_lockfd = open(lockfile, O_CREAT|O_RDWR, 0666);
+	if (_lockfd != -1)
+		lockf(_lockfd, F_LOCK, 0);
+}
+static void
+release_lockfile(void)
+{
+	if (_lockfd != -1) {
+		lockf(_lockfd, F_ULOCK, 0);
+		close(_lockfd);
+		_lockfd = -1;
+	}
+}
+inline static void 
+read_exportfs_conf(char **argv)
+{
+	char *s;
+
+	conf_init_file(NFS_CONFFILE);
+	xlog_set_debug("exportfs");
+
+	/* NOTE: following uses "mountd" section of nfs.conf !!!! */
+	s = conf_get_str("mountd", "state-directory-path");
+	/* Also look in the exportd section */
+	if (s == NULL)
+		s = conf_get_str("exportd", "state-directory-path");
+	if (s && !state_setup_basedir(argv[0], s))
+		exit(1);
+
+}
+int
+main(int argc, char **argv)
+{
+	char	*options = NULL;
+	char	*progname = NULL;
+	int	f_export = 1;
+	int	f_all = 0;
+	int	f_verbose = 0;
+	int	f_export_format = 0;
+	int	f_reexport = 0;
+	int	f_ignore = 0;
+	int	i, c;
+	int	force_flush = 0;
+
+	if ((progname = strrchr(argv[0], '/')) != NULL)
+		progname++;
+	else
+		progname = argv[0];
+
+	xlog_open(progname);
+	xlog_stderr(1);
+	xlog_syslog(0);
+
+	/* Read in config setting */
+	read_exportfs_conf(argv);
+
+	nfsd_path_init();
+
+	while ((c = getopt(argc, argv, "ad:fhio:ruvs")) != EOF) {
+		switch(c) {
+		case 'a':
+			f_all = 1;
+			break;
+		case 'd':
+			xlog_sconfig(optarg, 1);
+			break;
+		case 'f':
+			force_flush = 1;
+			break;
+		case 'h':
+			usage(progname, 0);
+			break;
+		case 'i':
+			f_ignore = 1;
+			break;
+		case 'o':
+			options = optarg;
+			break;
+		case 'r':
+			f_reexport = 1;
+			f_all = 1;
+			break;
+		case 'u':
+			f_export = 0;
+			break;
+		case 'v':
+			f_verbose = 1;
+			break;
+		case 's':
+			f_export_format = 1;
+			break;
+		default:
+			usage(progname, 1);
+			break;
+		}
+	}
+
+	if (optind != argc && f_all) {
+		xlog(L_ERROR, "extra arguments are not permitted with -a or -r");
+		return 1;
+	}
+	if (f_ignore && (f_all || ! f_export)) {
+		xlog(L_ERROR, "-i not meaningful with -a, -r or -u");
+		return 1;
+	}
+	if (f_reexport && ! f_export) {
+		xlog(L_ERROR, "-r and -u are incompatible");
+		return 1;
+	}
+
+	if (!setup_state_path_names(progname, ETAB, ETABTMP, ETABLCK, &etab))
+		return 1;
+
+	if (optind == argc && ! f_all) {
+		if (force_flush) {
+			cache_flush();
+			free_state_path_names(&etab);
+			return 0;
+		} else {
+			xtab_export_read();
+			dump(f_verbose, f_export_format);
+			free_state_path_names(&etab);
+			export_freeall();
+			return 0;
+		}
+	}
+
+	/*
+	 * Serialize things as best we can
+	 */
+	grab_lockfile();
+	atexit(release_lockfile);
+
+	if (f_export && ! f_ignore) {
+		if (! (export_read(_PATH_EXPORTS, 0) +
+		       export_d_read(_PATH_EXPORTS_D, 0))) {
+			if (f_verbose)
+				xlog(L_WARNING, "No file systems exported!");
+		}
+	}
+	if (f_export) {
+		if (f_all)
+			export_all(f_verbose);
+		else
+			for (i = optind; i < argc ; i++)
+				exportfs(argv[i], options, f_verbose);
+	}
+	/* If we are unexporting everything, then
+	 * don't care about what should be exported, as that
+	 * may require DNS lookups..
+	 */
+	if (! ( !f_export && f_all)) {
+		/* note: xtab_*_read does not update entries if they already exist,
+		 * so this will not lose new options
+		 */
+		if (!f_reexport)
+			xtab_export_read();
+		if (!f_export)
+			for (i = optind ; i < argc ; i++)
+				unexportfs(argv[i], f_verbose);
+	}
+	xtab_export_write();
+	cache_flush();
+	free_state_path_names(&etab);
+	export_freeall();
+
+	return export_errno;
+}
+
+/*
+ * export_all finds all entries and
+ *    marks them xtabent and mayexport so that they get exported
+ */
+static void
+export_all(int verbose)
+{
+	nfs_export	*exp;
+	int		i;
+
+	for (i = 0; i < MCL_MAXTYPES; i++) {
+		for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
+			if (verbose)
+				printf("exporting %s:%s\n",
+				       exp->m_client->m_hostname,
+				       exp->m_export.e_path);
+			exp->m_xtabent = 1;
+			exp->m_mayexport = 1;
+			exp->m_changed = 1;
+			exp->m_warned = 0;
+			validate_export(exp);
+		}
+	}
+}
+
+
+static void
+exportfs_parsed(char *hname, char *path, char *options, int verbose)
+{
+	struct exportent *eep;
+	nfs_export	*exp = NULL;
+	struct addrinfo	*ai = NULL;
+	int		htype;
+
+	if ((htype = client_gettype(hname)) == MCL_FQDN) {
+		ai = host_addrinfo(hname);
+		if (ai != NULL) {
+			exp = export_find(ai, path);
+			hname = ai->ai_canonname;
+		}
+	} else
+		exp = export_lookup(hname, path, 0);
+
+	if (!exp) {
+		if (!(eep = mkexportent(hname, path, options)) ||
+		    !(exp = export_create(eep, 0)))
+			goto out;
+	} else if (!updateexportent(&exp->m_export, options))
+		goto out;
+
+	if (verbose)
+		printf("exporting %s:%s\n", exp->m_client->m_hostname,
+			exp->m_export.e_path);
+	exp->m_xtabent = 1;
+	exp->m_mayexport = 1;
+	exp->m_changed = 1;
+	exp->m_warned = 0;
+	validate_export(exp);
+
+out:
+	nfs_freeaddrinfo(ai);
+}
+
+static int exportfs_generic(char *arg, char *options, int verbose)
+{
+	char *path;
+
+	if ((path = strchr(arg, ':')) != NULL)
+		*path++ = '\0';
+
+	if (!path || *path != '/')
+		return 1;
+
+	exportfs_parsed(arg, path, options, verbose);
+	return 0;
+}
+
+static int exportfs_ipv6(char *arg, char *options, int verbose)
+{
+	char *path, *c;
+
+	arg++;
+	c = strchr(arg, ']');
+	if (c == NULL)
+		return 1;
+
+	/* no colon means this is a wildcarded DNS hostname */
+	if (memchr(arg, ':', c - arg) == NULL)
+		return exportfs_generic(--arg, options, verbose);
+
+	path = strstr(c, ":/");
+	if (path == NULL)
+		return 1;
+	*path++ = '\0';
+
+	/* if there's anything between the closing brace and the
+	 * path separator, it's probably a prefix length */
+	memmove(c, c + 1, path - c);
+
+	exportfs_parsed(arg, path, options, verbose);
+	return 0;
+}
+
+static void
+exportfs(char *arg, char *options, int verbose)
+{
+	int failed;
+
+	if (*arg == '[')
+		failed = exportfs_ipv6(arg, options, verbose);
+	else
+		failed = exportfs_generic(arg, options, verbose);
+	if (failed)
+		xlog(L_ERROR, "Invalid export syntax: %s", arg);
+}
+
+static void
+unexportfs_parsed(char *hname, char *path, int verbose)
+{
+	nfs_export	*exp;
+	struct addrinfo *ai = NULL;
+	int		htype;
+	int		success = 0;
+
+	if ((htype = client_gettype(hname)) == MCL_FQDN) {
+		ai = host_addrinfo(hname);
+		if (ai)
+			hname = ai->ai_canonname;
+	}
+
+	/*
+	 * It's possible the specified path ends with a '/'. But
+	 * the entry from exportlist won't has the trailing '/',
+	 * so need to deal with it.
+	*/
+	size_t nlen = strlen(path);
+	while ((nlen > 1) && (path[nlen - 1] == '/'))
+		nlen--;
+
+	for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
+		if (strlen(exp->m_export.e_path) != nlen)
+			continue;
+		if (path && strncmp(path, exp->m_export.e_path, nlen))
+			continue;
+		if (htype != exp->m_client->m_type)
+			continue;
+		if (htype == MCL_FQDN
+		    && !matchhostname(exp->m_export.e_hostname,
+					  hname))
+			continue;
+		if (htype != MCL_FQDN
+		    && strcasecmp(exp->m_export.e_hostname, hname))
+			continue;
+		if (verbose) {
+#if 0
+			if (exp->m_exported) {
+				printf("unexporting %s:%s from kernel\n",
+				       exp->m_client->m_hostname,
+				       exp->m_export.e_path);
+			}
+			else
+#endif
+				printf("unexporting %s:%s\n",
+					exp->m_client->m_hostname,
+					exp->m_export.e_path);
+		}
+		exp->m_xtabent = 0;
+		exp->m_mayexport = 0;
+		success = 1;
+	}
+	if (!success)
+		xlog(L_ERROR, "Could not find '%s:%s' to unexport.", hname, path);
+
+	nfs_freeaddrinfo(ai);
+}
+
+static int unexportfs_generic(char *arg, int verbose)
+{
+	char *path;
+
+	if ((path = strchr(arg, ':')) != NULL)
+		*path++ = '\0';
+
+	if (!path || *path != '/')
+		return 1;
+
+	unexportfs_parsed(arg, path, verbose);
+	return 0;
+}
+
+static int unexportfs_ipv6(char *arg, int verbose)
+{
+	char *path, *c;
+
+	arg++;
+	c = strchr(arg, ']');
+	if (c == NULL)
+		return 1;
+
+	/* no colon means this is a wildcarded DNS hostname */
+	if (memchr(arg, ':', c - arg) == NULL)
+		return unexportfs_generic(--arg, verbose);
+
+	path = strstr(c, ":/");
+	if (path == NULL)
+		return 1;
+	*path++ = '\0';
+
+	/* if there's anything between the closing brace and the
+	 * path separator, it's probably a prefix length */
+	memmove(c, c + 1, path - c);
+
+	unexportfs_parsed(arg, path, verbose);
+	return 0;
+}
+
+static void
+unexportfs(char *arg, int verbose)
+{
+	int failed;
+
+	if (*arg == '[')
+		failed = unexportfs_ipv6(arg, verbose);
+	else
+		failed = unexportfs_generic(arg, verbose);
+	if (failed)
+		xlog(L_ERROR, "Invalid export syntax: %s", arg);
+}
+
+static int can_test(void)
+{
+	char buf[1024] = { 0 };
+	int fd;
+	int n;
+	size_t bufsiz = sizeof(buf);
+
+	fd = open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY);
+	if (fd < 0)
+		return 0;
+
+	/*
+	 * We introduce tolerance of 1 day to ensure that we use a
+	 * LONG_MAX for the expiry timestamp before it is actually
+	 * needed. To use LONG_MAX, the kernel code must have
+	 * commit 2f74f972  (sunrpc: prepare NFS for 2038).
+	 */
+	if (time(NULL) > INT_TO_LONG_THRESHOLD_SECS)
+		snprintf(buf, bufsiz-1, "nfsd 0.0.0.0 %ld -test-client-\n", LONG_MAX);
+	else
+		snprintf(buf, bufsiz-1, "nfsd 0.0.0.0 %d -test-client-\n", INT_MAX);
+
+	n = write(fd, buf, strlen(buf));
+	close(fd);
+	if (n < 0)
+		return 0;
+
+	fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
+	if (fd < 0)
+		return 0;
+	close(fd);
+	return 1;
+}
+
+static void
+validate_export(nfs_export *exp)
+{
+	/* Check that the given export point is potentially exportable.
+	 * We just give warnings here, don't cause anything to fail.
+	 * If a path doesn't exist, or is not a dir or file, give an warning
+	 * otherwise trial-export to '-test-client-' and check for failure.
+	 */
+	struct stat stb;
+	char *path = exportent_realpath(&exp->m_export);
+	struct statfs stf;
+	int fs_has_fsid = 0;
+
+	if (stat(path, &stb) < 0) {
+		xlog(L_ERROR, "Failed to stat %s: %m", path);
+		return;
+	}
+	if (!S_ISDIR(stb.st_mode)) {
+		xlog(L_ERROR, "%s is not a directory. "
+			"Remote access will fail", path);
+		return;
+	}
+	if (!can_test())
+		return;
+
+	if (!statfs(path, &stf) &&
+	    (stf.f_fsid.__val[0] || stf.f_fsid.__val[1]))
+		fs_has_fsid = 1;
+
+	if ((exp->m_export.e_flags & NFSEXP_FSID) || exp->m_export.e_uuid ||
+	    fs_has_fsid) {
+		if ( !export_test(&exp->m_export, 1)) {
+			xlog(L_ERROR, "%s does not support NFS export", path);
+			return;
+		}
+	} else if ( !export_test(&exp->m_export, 0)) {
+		if (export_test(&exp->m_export, 1))
+			xlog(L_ERROR, "%s requires fsid= for NFS export", path);
+		else
+			xlog(L_ERROR, "%s does not support NFS export", path);
+		return;
+
+	}
+}
+
+static _Bool
+is_hostname(const char *sp)
+{
+	if (*sp == '\0' || *sp == '@')
+		return false;
+
+	for (; *sp != '\0'; sp++) {
+		if (*sp == '*' || *sp == '?' || *sp == '[' || *sp == '/')
+			return false;
+		if (*sp == '\\' && sp[1] != '\0')
+			sp++;
+	}
+
+	return true;
+}
+
+/*
+ * Take care to perform an explicit reverse lookup on presentation
+ * addresses.  Otherwise we don't get a real canonical name or a
+ * complete list of addresses.
+ */
+static struct addrinfo *
+address_list(const char *hostname)
+{
+	struct addrinfo *ai;
+	char *cname;
+
+	ai = host_pton(hostname);
+	if (ai != NULL) {
+		/* @hostname was a presentation address */
+		cname = host_canonname(ai->ai_addr);
+		nfs_freeaddrinfo(ai);
+		if (cname != NULL)
+			goto out;
+	}
+	/* @hostname was a hostname or had no reverse mapping */
+	cname = strdup(hostname);
+	if (cname == NULL)
+		return NULL;
+
+out:
+	ai = host_addrinfo(cname);
+	free(cname);
+	return ai;
+}
+
+static int
+matchhostname(const char *hostname1, const char *hostname2)
+{
+	struct addrinfo *results1 = NULL, *results2 = NULL;
+	struct addrinfo *ai1, *ai2;
+	int result = 0;
+
+	if (strcasecmp(hostname1, hostname2) == 0)
+		return 1;
+
+	/*
+	 * Don't pass export wildcards or netgroup names to DNS
+	 */
+	if (!is_hostname(hostname1) || !is_hostname(hostname2))
+		return 0;
+
+	results1 = address_list(hostname1);
+	if (results1 == NULL)
+		goto out;
+	results2 = address_list(hostname2);
+	if (results2 == NULL)
+		goto out;
+
+	if (strcasecmp(results1->ai_canonname, results2->ai_canonname) == 0) {
+		result = 1;
+		goto out;
+	}
+
+	for (ai1 = results1; ai1 != NULL; ai1 = ai1->ai_next)
+		for (ai2 = results2; ai2 != NULL; ai2 = ai2->ai_next)
+			if (nfs_compare_sockaddr(ai1->ai_addr, ai2->ai_addr)) {
+				result = 1;
+				break;
+			}
+
+out:
+	nfs_freeaddrinfo(results1);
+	nfs_freeaddrinfo(results2);
+	return result;
+}
+
+#ifdef HAVE_FUNC_ATTRIBUTE_FORMAT
+__attribute__((format (printf, 2, 3)))
+#endif
+static char
+dumpopt(char c, char *fmt, ...)
+{
+	va_list	ap;
+
+	va_start(ap, fmt);
+	printf("%c", c);
+	vprintf(fmt, ap);
+	va_end(ap);
+	return ',';
+}
+
+static void
+dump(int verbose, int export_format)
+{
+	/* buf[] size should >= sizeof(struct exportent->e_path) */
+	char buf[NFS_MAXPATHLEN+1] = { 0 };
+	char *bp;
+	int len;
+	nfs_export	*exp;
+	struct exportent *ep;
+	int		htype;
+	char		*hname, c;
+
+	for (htype = 0; htype < MCL_MAXTYPES; htype++) {
+		for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
+			ep = &exp->m_export;
+			if (!exp->m_xtabent)
+			    continue; /* neilb */
+			if (htype == MCL_ANONYMOUS)
+				hname = (export_format) ? "*" : "<world>";
+			else
+				hname = ep->e_hostname;
+			if (strlen(ep->e_path) > 14 && !export_format)
+				printf("%-14s\n\t\t%s", ep->e_path, hname);
+			else
+				if (export_format) {
+					bp = buf;
+					len = sizeof(buf) - 1;
+					qword_add(&bp, &len, ep->e_path);
+					*bp = '\0';
+					printf("%s %s", buf, hname);
+				} else {
+					printf("%-14s\t%s", ep->e_path, hname);
+				}
+
+			if (!verbose && !export_format) {
+				printf("\n");
+				continue;
+			}
+			c = '(';
+			if (ep->e_flags & NFSEXP_ASYNC)
+				c = dumpopt(c, "async");
+			else
+				c = dumpopt(c, "sync");
+			if (ep->e_flags & NFSEXP_GATHERED_WRITES)
+				c = dumpopt(c, "wdelay");
+			else
+				c = dumpopt(c, "no_wdelay");
+			if (ep->e_flags & NFSEXP_NOHIDE)
+				c = dumpopt(c, "nohide");
+			else
+				c = dumpopt(c, "hide");
+			if (ep->e_flags & NFSEXP_CROSSMOUNT)
+				c = dumpopt(c, "crossmnt");
+			if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
+				c = dumpopt(c, "no_subtree_check");
+			if (ep->e_flags & NFSEXP_NOAUTHNLM)
+				c = dumpopt(c, "insecure_locks");
+			if (ep->e_flags & NFSEXP_NOREADDIRPLUS)
+				c = dumpopt(c, "nordirplus");
+			if (ep->e_flags & NFSEXP_SECURITY_LABEL)
+				c = dumpopt(c, "security_label");
+			if (ep->e_flags & NFSEXP_NOACL)
+				c = dumpopt(c, "no_acl");
+			if (ep->e_flags & NFSEXP_PNFS)
+				c = dumpopt(c, "pnfs");
+			if (ep->e_flags & NFSEXP_FSID)
+				c = dumpopt(c, "fsid=%d", ep->e_fsid);
+			if (ep->e_uuid)
+				c = dumpopt(c, "fsid=%s", ep->e_uuid);
+			if (ep->e_reexport) {
+				switch (ep->e_reexport) {
+					case REEXP_AUTO_FSIDNUM:
+						c = dumpopt(c, "reexport=%s", "auto-fsidnum");
+						break;
+					case REEXP_PREDEFINED_FSIDNUM:
+						c = dumpopt(c, "reexport=%s", "predefined-fsidnum");
+						break;
+				}
+			}
+			if (ep->e_mountpoint)
+				c = dumpopt(c, "mountpoint%s%s",
+					    ep->e_mountpoint[0]?"=":"",
+					    ep->e_mountpoint);
+			if (ep->e_anonuid != 65534)
+				c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
+			if (ep->e_anongid != 65534)
+				c = dumpopt(c, "anongid=%d", ep->e_anongid);
+			switch(ep->e_fslocmethod) {
+			case FSLOC_NONE:
+				break;
+			case FSLOC_REFER:
+				c = dumpopt(c, "refer=%s", ep->e_fslocdata);
+				break;
+			case FSLOC_REPLICA:
+				c = dumpopt(c, "replicas=%s", ep->e_fslocdata);
+				break;
+#ifdef DEBUG
+			case FSLOC_STUB:
+				c = dumpopt(c, "fsloc=stub");
+				break;
+#endif
+			}
+			secinfo_show(stdout, ep);
+			xprtsecinfo_show(stdout, ep);
+			printf("%c\n", (c != '(')? ')' : ' ');
+		}
+	}
+}
+
+static void
+usage(const char *progname, int n)
+{
+	fprintf(stderr, "usage: %s [-adfhioruvs] [host:/path]\n", progname);
+	exit(n);
+}
diff --git a/utils/exportfs/exportfs.man b/utils/exportfs/exportfs.man
new file mode 100644
index 0000000..6d417a7
--- /dev/null
+++ b/utils/exportfs/exportfs.man
@@ -0,0 +1,337 @@
+.\"@(#)exportfs.8"
+.\"
+.\" Copyright (C) 1995 Olaf Kirch <okir@monad.swb.de>
+.\" Modifications 1999-2003 Neil Brown <neilb@cse.unsw.edu.au>
+.\"
+.TH exportfs 8 "30 September 2013"
+.SH NAME
+exportfs \- maintain table of exported NFS file systems
+.SH SYNOPSIS
+.BI "/usr/sbin/exportfs [-avi] [-o " "options,.." "] [" "client:/path" " ..]
+.br
+.BI "/usr/sbin/exportfs -r [-v]"
+.br
+.BI "/usr/sbin/exportfs [-av] -u [" "client:/path" " ..]
+.br
+.BI "/usr/sbin/exportfs [-v]
+.br
+.BI "/usr/sbin/exportfs -f"
+.br
+.BI "/usr/sbin/exportfs -s"
+.br
+.SH DESCRIPTION
+An NFS server maintains a table of local physical file systems
+that are accessible to NFS clients.
+Each file system in this table is  referred to as an
+.IR "exported file system" ,
+or
+.IR export ,
+for short.
+.PP
+The
+.B exportfs
+command maintains the current table of exports for the NFS server.
+The master export table is kept in a file named
+.IR /var/lib/nfs/etab .
+This file is read by
+.B rpc.mountd
+when a client sends an NFS MOUNT request.
+.PP
+Normally the master export table is initialized with the contents of
+.I /etc/exports
+and files under
+.I /etc/exports.d
+by invoking
+.BR "exportfs -a" .
+However, a system administrator can choose to add or delete
+exports without modifying
+.I /etc/exports
+or files under
+.I /etc/exports.d
+by using the
+.B exportfs
+command.
+.PP
+.B exportfs
+and its partner program
+.B rpc.mountd
+work in one of two modes: a legacy mode which applies to 2.4 and
+earlier versions of the Linux kernel, and a new mode which applies to
+2.6 and later versions, providing the
+.B nfsd
+virtual filesystem has been mounted at
+.I /proc/fs/nfsd
+or
+.IR /proc/fs/nfs .
+On 2.6 kernels, if this filesystem is not mounted, the legacy mode is used.
+.PP
+In the new mode,
+.B exportfs
+does not give any information to the kernel, but provides it only to
+.B rpc.mountd
+through the
+.I /var/lib/nfs/etab
+file.
+.B rpc.mountd
+then manages kernel requests for information about exports, as needed.
+.PP
+In the legacy mode,
+exports which identify a specific host, rather than a subnet or netgroup,
+are entered directly into the kernel's export table,
+as well as being written to
+.IR /var/lib/nfs/etab .
+Further, exports listed in
+.I /var/lib/nfs/rmtab
+which match a non host-specific export request will cause an
+appropriate export entry for the host given in
+.I rmtab
+to be added to the kernel's export table.
+.SH OPTIONS
+.TP
+.B \-d kind " or " \-\-debug kind
+Turn on debugging. Valid kinds are: all, auth, call, general and parse.
+Debugging can also be turned on by setting
+.B debug=
+in the
+.B [exportfs]
+section of
+.IR /etc/nfs.conf .
+
+.TP
+.B -a
+Export or unexport all directories.
+.TP
+.BI "-o " options,...
+Specify a list of export options in the same manner as in
+.BR exports (5).
+.TP
+.B -i
+Ignore the
+.I /etc/exports
+file and files under
+.I /etc/exports.d
+directory.  Only default options and options given on the command line are used.
+.TP
+.B -r
+Reexport all directories, synchronizing
+.I /var/lib/nfs/etab
+with
+.IR /etc/exports 
+and files under 
+.IR /etc/exports.d .
+This option removes entries in
+.I /var/lib/nfs/etab
+which have been deleted from
+.I /etc/exports
+or files under
+.IR /etc/exports.d , 
+and removes any entries from the
+kernel export table which are no longer valid.
+.TP
+.B -u
+Unexport one or more directories.
+.TP
+.B -f
+If
+.I /proc/fs/nfsd
+or
+.I /proc/fs/nfs
+is mounted, flush everything out of the kernel's export table.
+Fresh entries for active clients are added to the kernel's export table by
+.B rpc.mountd
+when they make their next NFS mount request.
+.TP
+.B -v
+Be verbose. When exporting or unexporting, show what's going on. When
+displaying the current export list, also display the list of export
+options.
+.TP
+.B -s
+Display the current export list suitable for /etc/exports.
+
+.SH CONFIGURATION FILE
+The
+.B [exportfs]
+section of the
+.I /etc/nfs.conf
+configuration file can contain a
+.B debug
+value, which can be one or more from the list
+.BR general ,
+.BR call ,
+.BR auth ,
+.BR parse ,
+.BR all .
+When a list is given, the members should be comma-separated.
+
+.B exportfs
+will also recognize the
+.B state-directory-path
+value from both the 
+.B [mountd]
+section and the
+.B [exportd]
+section
+
+.SH DISCUSSION
+.SS Exporting Directories
+The first synopsis shows how to invoke
+.B exportfs
+when adding new entries to the export table.  When using
+.BR "exportfs -a" ,
+all exports listed in
+.I /etc/exports
+and files under
+.I /etc/exports.d
+are added to
+.IR /var/lib/nfs/etab .
+The kernel's export table is also updated as needed.
+.PP
+The
+.I host:/path
+argument specifies a local directory to export,
+along with the client or clients who are permitted to access it.
+See
+.B exports(5)
+for a description of supported options and access list formats.
+.PP
+IPv6 presentation addresses contain colons, which are already used
+to separate the "host" and "path" command line arguments.
+When specifying a client using a raw IPv6 address,
+enclose the address in square brackets.
+For IPv6 network addresses, place the prefix just after the closing
+bracket.
+.PP
+To export a directory to the world, simply specify
+.IR :/path .
+.PP
+The export options for a particular host/directory pair derive from
+several sources.
+The default export options are
+.BR sync,ro,root_squash,wdelay .
+These can be overridden by entries in
+.IR /etc/exports 
+or files under
+.IR /etc/exports.d .
+.PP
+A system administrator may override options from these sources using the
+.B -o
+command-line option on
+.BR exportfs .
+This option takes a comma-separated list of options in the same fashion
+as one would specify them in
+.IR /etc/exports .
+In this way
+.B exportfs
+can be used to modify the export options of an already exported directory.
+.SS Unexporting Directories
+The third synopsis shows how to unexport a currently exported directory.
+When using
+.BR "exportfs -ua" ,
+all entries listed in
+.I /var/lib/nfs/etab
+are removed from the kernel export tables, and the file is cleared. This
+effectively shuts down all NFS activity.
+.PP
+To remove an export, specify a
+.I host:/path
+pair. This deletes the specified entry from
+.I /var/lib/nfs/etab
+and removes the corresponding kernel entry (if any).
+.PP
+.SS Dumping the Export Table
+Invoking
+.B exportfs
+without options shows the current list of exported file systems.
+Adding the
+.B -v
+option causes
+.B exportfs
+to display the export options for each export.
+.SH EXAMPLES
+The following adds all directories listed in
+.I /etc/exports
+and files under
+.I /etc/exports.d
+to
+.I /var/lib/nfs/etab
+and pushes the resulting export entries into the kernel:
+.PP
+.nf
+.B "# exportfs -a
+.fi
+.PP
+To export the
+.I /usr/tmp
+directory to host
+.BR django ,
+allowing insecure file locking requests from clients:
+.PP
+.nf
+.B "# exportfs -o insecure_locks django:/usr/tmp
+.fi
+.PP
+To unexport the
+.I /usr/tmp
+directory:
+.PP
+.nf
+.B "# exportfs -u django:/usr/tmp
+.fi
+.PP
+To unexport all exports listed in
+.IR /etc/exports 
+and files under
+.IR /etc/exports.d :
+.PP
+.nf
+.B "# exportfs -au
+.fi
+.PP
+To export the
+.I /usr/tmp
+directory to IPv6 link-local clients:
+.PP
+.nf
+.B "# exportfs [fe80::]/64:/usr/tmp
+.fi
+.SH USAGE NOTES
+Exporting to IP networks or DNS and NIS domains does not enable clients
+from these groups to access NFS immediately.
+Rather, these sorts of exports are hints to
+.BR rpc.mountd (8)
+to grant any mount requests from these clients.
+This is usually not a problem, because any existing mounts are preserved in
+.I rmtab
+across reboots.
+.PP
+When unexporting a network or domain entry, any current exports to members
+of this group will be checked against the remaining valid exports and
+if they themselves are no longer valid they will be removed.
+.SH FILES
+.TP 2.5i
+.I /etc/exports
+input file listing exports, export options, and access control lists
+.TP 2.5i
+.I /etc/exports.d
+directory where extra input files are stored.
+.B Note:
+only files that end with 
+.I .exports
+are used.
+.TP 2.5i
+.I /var/lib/nfs/etab
+master table of exports
+.TP 2.5i
+.I /var/lib/nfs/rmtab
+table of clients accessing server's exports
+.SH SEE ALSO
+.BR exports (5),
+.BR nfs.conf (5),
+.BR rpc.mountd (8),
+.BR exportd (8),
+.BR netgroup (5)
+.SH AUTHORS
+Olaf Kirch <okir@monad.swb.de>
+.br
+Neil Brown <neilb@cse.unsw.edu.au>
diff --git a/utils/exportfs/exports.man b/utils/exportfs/exports.man
new file mode 100644
index 0000000..b758277
--- /dev/null
+++ b/utils/exportfs/exports.man
@@ -0,0 +1,678 @@
+.\"@(#)exports.5"
+.\"
+.TH exports 5 "31 December 2009"
+.SH NAME
+exports \- NFS server export table
+.SH DESCRIPTION
+The file
+.I /etc/exports
+contains a table of local physical file systems on an NFS server
+that are accessible to NFS clients.
+The contents of the file are maintained by the server's system
+administrator.
+.PP
+Each file system in this table has a list of options and an
+access control list.
+The table is used by
+.BR exportfs (8)
+to give information to
+.BR mountd (8).
+.PP
+The file format is similar to the SunOS
+.I exports
+file. Each line contains an export point and a whitespace-separated list
+of clients allowed to mount the file system at that point. Each listed
+client may be immediately followed by a parenthesized, comma-separated
+list of export options for that client. No whitespace is permitted
+between a client and its option list.
+.PP
+Also, each line may have one or more specifications for default options
+after the path name, in the form of a dash ("\-") followed by an option
+list. The option list is used for all subsequent exports on that line
+only.
+.PP
+Blank lines are ignored.  A pound sign ("#") introduces a comment to the
+end of the line. Entries may be continued across newlines using a
+backslash. If an export name contains spaces it should be quoted using
+double quotes. You can also specify spaces or other unusual character in
+the export name using a backslash followed by the character code as three
+octal digits.
+.PP
+To apply changes to this file, run
+.BR "exportfs \-ra"
+or restart the NFS server.
+.PP
+.SS Machine Name Formats
+NFS clients may be specified in a number of ways:
+.IP "single host
+You may specify a host either by an
+abbreviated name recognized be the resolver, the fully qualified domain
+name, an IPv4 address, or an IPv6 address. IPv6 addresses must not be
+inside square brackets in /etc/exports lest they be confused with
+character-class wildcard matches.
+.IP "IP networks
+You can also export directories to all hosts on an IP (sub-) network
+simultaneously. This is done by specifying an IP address and netmask pair
+as
+.IR address/netmask
+where the netmask can be specified in dotted-decimal format, or as a
+contiguous mask length.
+For example, either `/255.255.252.0' or `/22' appended
+to the network base IPv4 address results in identical subnetworks with 10 bits
+of host. IPv6 addresses must use a contiguous mask length and must not be inside square brackets to avoid confusion with character-class wildcards. Wildcard characters generally do not work on IP addresses, though they
+may work by accident when reverse DNS lookups fail.
+.IP "wildcards
+Machine names may contain the wildcard characters \fI*\fR and \fI?\fR, or may contain character class lists within [square brackets].
+This can be used to make the \fIexports\fR file more compact; for instance,
+\fI*.cs.foo.edu\fR matches all hosts in the domain
+\fIcs.foo.edu\fR.  As these characters also match the dots in a domain
+name, the given pattern will also match all hosts within any subdomain
+of \fIcs.foo.edu\fR.
+.IP "netgroups
+NIS netgroups may be given as
+.IR @group .
+Only the host part of each
+netgroup members is consider in checking for membership.  Empty host
+parts or those containing a single dash (\-) are ignored.
+.IP "anonymous
+This is specified by a single
+.I *
+character (not to be confused with the
+.I wildcard
+entry above) and will match all clients.
+.\".TP
+.\".B =public
+.\"This is a special ``hostname'' that identifies the given directory name
+.\"as the public root directory (see the section on WebNFS in
+.\".BR nfsd (8)
+.\"for a discussion of WebNFS and the public root handle). When using this
+.\"convention,
+.\".B =public
+.\"must be the only entry on this line, and must have no export options
+.\"associated with it. Note that this does
+.\".I not
+.\"actually export the named directory; you still have to set the exports
+.\"options in a separate entry.
+.\".PP
+.\"The public root path can also be specified by invoking
+.\".I nfsd
+.\"with the
+.\".B \-\-public\-root
+.\"option. Multiple specifications of a public root will be ignored.
+.PP
+If a client matches more than one of the specifications above, then
+the first match from the above list order takes precedence - regardless of
+the order they appear on the export line. However, if a client matches
+more than one of the same type of specification (e.g. two netgroups),
+then the first match from the order they appear on the export line takes
+precedence.
+.SS RPCSEC_GSS security
+You may use the special strings "gss/krb5", "gss/krb5i", or "gss/krb5p"
+to restrict access to clients using rpcsec_gss security.  However, this
+syntax is deprecated; on linux kernels since 2.6.23, you should instead
+use the "sec=" export option:
+.TP
+.IR sec=
+The sec= option, followed by a colon-delimited list of security flavors,
+restricts the export to clients using those flavors.  Available security
+flavors include sys (the default--no cryptographic security), krb5
+(authentication only), krb5i (integrity protection), and krb5p (privacy
+protection).  For the purposes of security flavor negotiation, order
+counts: preferred flavors should be listed first.  The order of the sec=
+option with respect to the other options does not matter, unless you
+want some options to be enforced differently depending on flavor.
+In that case you may include multiple sec= options, and following options
+will be enforced only for access using flavors listed in the immediately
+preceding sec= option.  The only options that are permitted to vary in
+this way are ro, rw, no_root_squash, root_squash, and all_squash.
+.SS Transport layer security
+The Linux NFS server allows the use of RPC-with-TLS (RFC 9289) to
+protect RPC traffic between itself and its clients.
+Alternately, administrators can secure NFS traffic using a VPN,
+or an ssh tunnel or similar mechanism, in a way that is transparent
+to the server.
+.PP
+To enable the use of RPC-with-TLS, the server's administrator must
+install and configure
+.BR tlshd
+to handle transport layer security handshake requests from the local
+kernel.
+Clients can then choose to use RPC-with-TLS or they may continue
+operating without it.
+.PP
+Administrators may require the use of RPC-with-TLS to protect access
+to individual exports.
+This is particularly useful when using non-cryptographic security
+flavors such as
+.IR sec=sys .
+The
+.I xprtsec=
+option, followed by an unordered colon-delimited list of security policies,
+can restrict access to the export to only clients that have negotiated
+transport-layer security.
+Currently supported transport layer security policies include:
+.TP
+.IR none
+The server permits clients to access the export
+without the use of transport layer security.
+.TP
+.IR tls
+The server permits clients that have negotiated an RPC-with-TLS session
+without peer authentication (confidentiality only) to access the export.
+Clients are not required to offer an x.509 certificate
+when establishing a transport layer security session.
+.TP
+.IR mtls
+The server permits clients that have negotiated an RPC-with-TLS session
+with peer authentication to access the export.
+The server requires clients to offer an x.509 certificate
+when establishing a transport layer security session.
+.PP
+If RPC-with-TLS is configured and enabled and the
+.I xprtsec=
+option is not specified, the default setting for an export is
+.IR xprtsec=none:tls:mtls .
+With this setting, the server permits clients to use any transport
+layer security mechanism or none at all to access the export.
+.SS General Options
+.BR exportfs
+understands the following export options:
+.TP
+.IR secure
+This option requires that requests not using gss originate on an
+Internet port less than IPPORT_RESERVED (1024). This option is on by default.
+To turn it off, specify
+.IR insecure .
+(NOTE: older kernels (before upstream kernel version 4.17) enforced this
+requirement on gss requests as well.)
+.TP
+.IR rw
+Allow both read and write requests on this NFS volume. The
+default is to disallow any request which changes the filesystem.
+This can also be made explicit by using
+the
+.IR ro " option.
+.TP
+.IR async
+This option allows the NFS server to violate the NFS protocol and
+reply to requests before any changes made by that request have been
+committed to stable storage (e.g. disc drive).
+
+Using this option usually improves performance, but at the cost that
+an unclean server restart (i.e. a crash) can cause data to be lost or
+corrupted.
+
+.TP
+.IR sync
+Reply to requests only after the changes have been committed to stable
+storage (see
+.IR async
+above).
+
+In releases of nfs-utils up to and including 1.0.0, the
+.I async 
+option was the
+default.  In all releases after 1.0.0,
+.I sync
+is the default, and
+.I async
+must be explicitly requested if needed.
+.TP
+.IR no_wdelay
+This option has no effect if
+.I async
+is also set.  The NFS server will normally delay committing a write request
+to disc slightly if it suspects that another related write request may be in
+progress or may arrive soon.  This allows multiple write requests to
+be committed to disc with the one operation which can improve
+performance.  If an NFS server received mainly small unrelated
+requests, this behaviour could actually reduce performance, so
+.IR no_wdelay
+is available to turn it off.
+The default can be explicitly requested with the
+.IR wdelay " option.
+.TP
+.IR nohide
+This option is based on the option of the same name provided in IRIX
+NFS.  Normally, if a server exports two filesystems one of which is
+mounted on the other, then the client will have to mount both
+filesystems explicitly to get access to them.  If it just mounts the
+parent, it will see an empty directory at the place where the other
+filesystem is mounted.  That filesystem is "hidden".
+
+Setting the
+.I nohide
+option on a filesystem causes it not to be hidden, and an
+appropriately authorised client will be able to move from the parent to
+that filesystem without noticing the change.
+
+However, some NFS clients do not cope well with this situation as, for
+instance, it is then possible for two files in the one apparent
+filesystem to have the same inode number.
+
+The
+.I nohide
+option is currently only effective on
+.I "single host
+exports.  It does not work reliably with netgroup, subnet, or wildcard
+exports.
+
+This option can be very useful in some situations, but it should be
+used with due care, and only after confirming that the client system
+copes with the situation effectively.
+
+The option can be explicitly disabled for NFSv2 and NFSv3 with
+.IR hide .
+
+This option is not relevant when NFSv4 is use.  NFSv4 never hides
+subordinate filesystems.  Any filesystem that is exported will be
+visible where expected when using NFSv4.
+.TP
+.I crossmnt
+This option is similar to
+.I nohide
+but it makes it possible for clients to access all filesystems mounted
+on a filesystem marked with
+.IR crossmnt .
+Thus when a child filesystem "B" is mounted on a parent "A", setting
+crossmnt on "A" has a similar effect to setting "nohide" on B.
+
+With
+.I nohide
+the child filesystem needs to be explicitly exported.  With
+.I crossmnt
+it need not.  If a child of a
+.I crossmnt
+file is not explicitly exported, then it will be implicitly exported
+with the same export options as the parent, except for
+.IR fsid= .
+This makes it impossible to
+.B not
+export a child of a
+.I crossmnt
+filesystem.  If some but not all subordinate filesystems of a parent
+are to be exported, then they must be explicitly exported and the
+parent should not have
+.I crossmnt
+set.
+
+The
+.I nocrossmnt
+option can explictly disable
+.I crossmnt
+if it was previously set.  This is rarely useful.
+.TP
+.IR no_subtree_check
+This option disables subtree checking, which has mild security
+implications, but can improve reliability in some circumstances.
+
+If a subdirectory of a filesystem is exported, but the whole
+filesystem isn't then whenever a NFS request arrives, the server must
+check not only that the accessed file is in the appropriate filesystem
+(which is easy) but also that it is in the exported tree (which is
+harder). This check is called the
+.IR subtree_check .
+
+In order to perform this check, the server must include some
+information about the location of the file in the "filehandle" that is
+given to the client.  This can cause problems with accessing files that
+are renamed while a client has them open (though in many simple cases
+it will still work).
+
+subtree checking is also used to make sure that files inside
+directories to which only root has access can only be accessed if the
+filesystem is exported with
+.I no_root_squash
+(see below), even if the file itself allows more general access.
+
+As a general guide, a home directory filesystem, which is normally
+exported at the root and may see lots of file renames, should be
+exported with subtree checking disabled.  A filesystem which is mostly
+readonly, and at least doesn't see many file renames (e.g. /usr or
+/var) and for which subdirectories may be exported, should probably be
+exported with subtree checks enabled.
+
+The default of having subtree checks enabled, can be explicitly
+requested with
+.IR subtree_check .
+
+From release 1.1.0 of nfs-utils onwards, the default will be
+.I no_subtree_check
+as subtree_checking tends to cause more problems than it is worth.
+If you genuinely require subtree checking, you should explicitly put
+that option in the
+.B exports
+file.  If you put neither option,
+.B exportfs
+will warn you that the change is pending.
+
+.TP
+.IR insecure_locks
+.TP
+.IR no_auth_nlm
+This option (the two names are synonymous) tells the NFS server not to require authentication of
+locking requests (i.e. requests which use the NLM protocol).  Normally
+the NFS server will require a lock request to hold a credential for a
+user who has read access to the file.  With this flag no access checks
+will be performed.
+
+Early NFS client implementations did not send credentials with lock
+requests, and many current NFS clients still exist which are based on
+the old implementations.  Use this flag if you find that you can only
+lock files which are world readable.
+
+The default behaviour of requiring authentication for NLM requests can
+be explicitly requested with either of the synonymous
+.IR auth_nlm ,
+or
+.IR secure_locks .
+.\".TP
+.\".I noaccess
+.\"This makes everything below the directory inaccessible for the named
+.\"client.  This is useful when you want to export a directory hierarchy to
+.\"a client, but exclude certain subdirectories. The client's view of a
+.\"directory flagged with noaccess is very limited; it is allowed to read
+.\"its attributes, and lookup `.' and `..'. These are also the only entries
+.\"returned by a readdir.
+.\".TP
+.\".IR link_relative
+.\"Convert absolute symbolic links (where the link contents start with a
+.\"slash) into relative links by prepending the necessary number of ../'s
+.\"to get from the directory containing the link to the root on the
+.\"server.  This has subtle, perhaps questionable, semantics when the file
+.\"hierarchy is not mounted at its root.
+.\".TP
+.\".IR link_absolute
+.\"Leave all symbolic link as they are. This is the default operation.
+
+.TP
+.IR mountpoint= path
+.TP
+.I mp
+This option makes it possible to only export a directory if it has
+successfully been mounted.
+If no path is given (e.g.
+.IR mountpoint " or " mp )
+then the export point must also be a mount point.  If it isn't then
+the export point is not exported.  This allows you to be sure that the
+directory underneath a mountpoint will never be exported by accident
+if, for example, the filesystem failed to mount due to a disc error.
+
+If a path is given (e.g.
+.IR mountpoint= "/path or " mp= /path)
+then the nominated path must be a mountpoint for the exportpoint to be
+exported.
+
+.TP
+.IR fsid= num|root|uuid
+NFS needs to be able to identify each filesystem that it exports.
+Normally it will use a UUID for the filesystem (if the filesystem has
+such a thing) or the device number of the device holding the
+filesystem (if the filesystem is stored on the device).
+
+As not all filesystems are stored on devices, and not all filesystems
+have UUIDs, it is sometimes necessary to explicitly tell NFS how to
+identify a filesystem.  This is done with the
+.I fsid=
+option.
+
+For NFSv4, there is a distinguished filesystem which is the root of
+all exported filesystem.  This is specified with
+.I fsid=root
+or
+.I fsid=0
+both of which mean exactly the same thing.
+
+Other filesystems can be identified with a small integer, or a UUID
+which should contain 32 hex digits and arbitrary punctuation.
+
+Linux kernels version 2.6.20 and earlier do not understand the UUID
+setting so a small integer must be used if an fsid option needs to be
+set for such kernels.  Setting both a small number and a UUID is
+supported so the same configuration can be made to work on old and new
+kernels alike.
+
+.TP
+.IR nordirplus
+This option will disable READDIRPLUS request handling.  When set,
+READDIRPLUS requests from NFS clients return NFS3ERR_NOTSUPP, and
+clients fall back on READDIR.  This option affects only NFSv3 clients.
+.TP
+.IR refer= path@host[+host][:path@host[+host]]
+A client referencing the export point will be directed to choose from
+the given list an alternative location for the filesystem.
+(Note that the server must have a mountpoint here, though a different
+filesystem is not required; so, for example,
+.IR "mount --bind" " /path /path"
+is sufficient.)
+.TP
+.IR replicas= path@host[+host][:path@host[+host]]
+If the client asks for alternative locations for the export point, it
+will be given this list of alternatives. (Note that actual replication
+of the filesystem must be handled elsewhere.)
+
+.TP
+.IR pnfs
+This option enables the use of the pNFS extension if the protocol level
+is NFSv4.1 or higher, and the filesystem supports pNFS exports.  With
+pNFS clients can bypass the server and perform I/O directly to storage
+devices. The default can be explicitly requested with the
+.I no_pnfs
+option.
+
+.TP
+.IR security_label
+With this option set, clients using NFSv4.2 or higher will be able to
+set and retrieve security labels (such as those used by SELinux).  This
+will only work if all clients use a consistent security policy.  Note
+that early kernels did not support this export option, and instead
+enabled security labels by default.
+
+.TP
+.IR reexport= auto-fsidnum|predefined-fsidnum
+This option helps when a NFS share is re-exported. Since the NFS server
+needs a unique identifier for each exported filesystem and a NFS share
+cannot provide such, usually a manual fsid is needed.
+As soon
+.IR crossmnt
+is used manually assigning fsid won't work anymore. This is where this
+option becomes handy. It will automatically assign a numerical fsid
+to exported NFS shares. The fsid and path relations are stored in a SQLite
+database. If
+.IR auto-fsidnum
+is selected, the fsid is also autmatically allocated.
+.IR predefined-fsidnum
+assumes pre-allocated fsid numbers and will just look them up.
+This option depends also on the kernel, you will need at least kernel version
+5.19.
+Since
+.IR reexport=
+can automatically allocate and assign numerical fsids, it is no longer possible
+to have numerical fsids in other exports as soon this option is used in at least
+one export entry.
+
+The association between fsid numbers and paths is stored in a SQLite database.
+Don't edit or remove the database unless you know exactly what you're doing.
+.IR predefined-fsidnum
+is useful when you have used
+.IR auto-fsidnum
+before and don't want further entries stored.
+
+
+.SS User ID Mapping
+.PP
+.B nfsd
+bases its access control to files on the server machine on the uid and
+gid provided in each NFS RPC request. The normal behavior a user would
+expect is that she can access her files on the server just as she would
+on a normal file system. This requires that the same uids and gids are
+used on the client and the server machine. This is not always true, nor
+is it always desirable.
+.PP
+Very often, it is not desirable that the root user on a client machine
+is also treated as root when accessing files on the NFS server. To this
+end, uid 0 is normally mapped to a different id: the so-called
+anonymous or
+.I nobody
+uid. This mode of operation (called `root squashing') is the default,
+and can be turned off with
+.IR no_root_squash .
+.PP
+By default,
+.\".B nfsd
+.\"tries to obtain the anonymous uid and gid by looking up user
+.\".I nobody
+.\"in the password file at startup time. If it isn't found, a uid and gid
+.B exportfs
+chooses a uid and gid
+of 65534 for squashed access. These values can also be overridden by
+the
+.IR anonuid " and " anongid
+options.
+.\".PP
+.\"In addition to this,
+.\".B nfsd
+.\"lets you specify arbitrary uids and gids that should be mapped to user
+.\"nobody as well.
+Finally, you can map all user requests to the
+anonymous uid by specifying the
+.IR all_squash " option.
+.PP
+Here's the complete list of mapping options:
+.TP
+.IR root_squash
+Map requests from uid/gid 0 to the anonymous uid/gid. Note that this does
+not apply to any other uids or gids that might be equally sensitive, such as
+user
+.IR bin
+or group
+.IR staff .
+.TP
+.IR no_root_squash
+Turn off root squashing. This option is mainly useful for diskless clients.
+.TP
+.IR all_squash
+Map all uids and gids to the anonymous user. Useful for NFS-exported
+public FTP directories, news spool directories, etc. The opposite option
+is
+.IR no_all_squash ,
+which is the default setting.
+.TP
+.IR anonuid " and " anongid
+These options explicitly set the uid and gid of the anonymous account.
+This option is primarily useful for PC/NFS clients, where you might want
+all requests appear to be from one user. As an example, consider the
+export entry for
+.B /home/joe
+in the example section below, which maps all requests to uid 150 (which
+is supposedly that of user joe).
+
+.SS Subdirectory Exports
+
+Normally you should only export only the root of a filesystem.  The NFS
+server will also allow you to export a subdirectory of a filesystem,
+however, this has drawbacks:
+
+First, it may be possible for a malicious user to access files on the
+filesystem outside of the exported subdirectory, by guessing filehandles
+for those other files.  The only way to prevent this is by using the
+.IR no_subtree_check
+option, which can cause other problems.
+
+Second, export options may not be enforced in the way that you would
+expect.  For example, the
+.IR security_label
+option will not work on subdirectory exports, and if nested subdirectory
+exports change the
+.IR security_label
+or
+.IR sec=
+options, NFSv4 clients will normally see only the options on the parent
+export.  Also, where security options differ, a malicious client may use
+filehandle-guessing attacks to access the files from one subdirectory
+using the options from another.
+
+
+.SS Extra Export Tables
+After reading 
+.I /etc/exports 
+.B exportfs
+reads files in the
+.I /etc/exports.d
+directory as extra export tables.  Only files ending in
+.I .exports
+are considered.  Files beginning with a dot are ignored.
+The format for extra export tables is the same as 
+.I /etc/exports
+.
+.IP
+.SH EXAMPLE
+.PP
+.nf
+.ta +3i
+# sample /etc/exports file
+/               master(rw) trusty(rw,no_root_squash)
+/projects       proj*.local.domain(rw)
+/usr            *.local.domain(ro) @trusted(rw)
+/home/joe       pc001(rw,all_squash,anonuid=150,anongid=100)
+/pub            *(ro,insecure,all_squash)
+/srv/www        \-sync,rw server @trusted @external(ro)
+/foo            2001:db8:9:e54::/64(rw) 192.0.2.0/24(rw)
+/build          buildhost[0-9].local.domain(rw)
+.\"/pub/private    (noaccess)
+.fi
+.PP
+The first line exports the entire filesystem to machines master and trusty.
+In addition to write access, all uid squashing is turned off for host
+trusty. The second and third entry show examples for wildcard hostnames
+and netgroups (this is the entry `@trusted'). The fourth line shows the
+entry for the PC/NFS client discussed above. Line 5 exports the
+public FTP directory to every host in the world, executing all requests
+under the nobody account. The
+.I insecure
+option in this entry also allows clients with NFS implementations that
+don't use a reserved port for NFS.
+The sixth line exports a directory read-write to the machine 'server'
+as well as the `@trusted' netgroup, and read-only to netgroup `@external',
+all three mounts with the `sync' option enabled. The seventh line exports
+a directory to both an IPv6 and an IPv4 subnet. The eighth line demonstrates
+a character class wildcard match.
+.\" The last line denies all NFS clients
+.\"access to the private directory.
+.\".SH CAVEATS
+.\"Unlike other NFS server implementations, this
+.\".B nfsd
+.\"allows you to export both a directory and a subdirectory thereof to
+.\"the same host, for instance
+.\".IR /usr " and " /usr/X11R6 .
+.\"In this case, the mount options of the most specific entry apply. For
+.\"instance, when a user on the client host accesses a file in
+.\".IR /usr/X11R6 ,
+.\"the mount options given in the
+.\".I /usr/X11R6
+.\"entry apply. This is also true when the latter is a wildcard or netgroup
+.\"entry.
+.SH FILES
+/etc/exports
+/etc/exports.d
+.SH SEE ALSO
+.BR exportfs (8),
+.BR netgroup (5),
+.BR mountd (8),
+.BR nfsd (8),
+.BR showmount (8),
+.BR tlshd (8).
+.\".SH DIAGNOSTICS
+.\"An error parsing the file is reported using syslogd(8) as level NOTICE from
+.\"a DAEMON whenever
+.\".BR nfsd (8)
+.\"or
+.\".BR mountd (8)
+.\"is started up.  Any unknown
+.\"host is reported at that time, but often not all hosts are not yet known
+.\"to
+.\".BR named (8)
+.\"at boot time, thus as hosts are found they are reported
+.\"with the same
+.\".BR syslogd (8)
+.\"parameters.
diff --git a/utils/exportfs/nfsd.man b/utils/exportfs/nfsd.man
new file mode 100644
index 0000000..514153f
--- /dev/null
+++ b/utils/exportfs/nfsd.man
@@ -0,0 +1,214 @@
+.\"
+.\" nfsd(7) - The nfsd filesystem
+.\"
+.\" Copyright (C) 2003 Neil Brown <neilb@cse.unsw.edu.au>
+.\" Licensed for public use under the terms of the FSF
+.\" General Public License (GPL) version 2.
+.TH nfsd 7 "3 July 2003"
+.SH NAME
+nfsd \- special filesystem for controlling Linux NFS server
+.SH SYNPOSIS
+.B "mount -t nfsd nfsd /proc/fs/nfsd"
+.SH DESCRIPTION
+The
+.B nfsd
+filesystem is a special filesystem which provides access to the Linux
+NFS server.  Writing to files in this filesystem can affect the server.
+Reading from them can provide information about the server.
+.P
+As well as this filesystem, there are a collection of files in the
+.B procfs
+filesystem (normally mounted at
+.BR /proc )
+which are used to control the NFS server.
+This manual page describes all of these files.
+.P
+The
+.I exportfs
+and
+.I mountd
+programs (part of the nfs-utils package) expect to find this
+filesystem mounted at
+.B /proc/fs/nfsd
+or
+.BR /proc/fs/nfs .
+.SH DETAILS
+Files in the
+.B nfsd
+filesystem include:
+.TP
+.B exports
+This file contains a list of filesystems that are currently exported
+and clients that each filesystem is exported to, together with a list
+of export options for that client/filesystem pair.  This is similar
+to the
+.B /proc/fs/nfs/exports
+file in 2.4.
+One difference is that a client doesn't necessarily correspond to just
+one host.  It can respond to a large collection of hosts that are
+being treated identically.
+
+Each line of the file contains a path name, a client name, and a
+number of options in parentheses.  Any space, tab, newline or
+back-slash character in the path name or client name will be replaced
+by a backslash followed by the octal ASCII code for that character.
+
+.TP
+.B threads
+This file represents the number of
+.B nfsd
+thread currently running.  Reading it will show the number of
+threads.  Writing an ASCII decimal number will cause the number of
+threads to be changed (increased or decreased as necessary) to achieve
+that number.
+
+.TP
+.B filehandle
+This is a somewhat unusual file  in that what is read from it depends
+on what was just written to it.  It provides a transactional interface
+where a program can open the file, write a request, and read a
+response.  If two separate programs open, write, and read at the same
+time, their requests will not be mixed up.
+
+The request written to
+.B filehandle
+should be a client name, a path name, and a number of bytes.  This
+should be followed by a newline, with white-space separating the
+fields, and octal quoting of special characters.
+
+On writing this, the program will be able to read back a filehandle
+for that path as exported to the given client.  The filehandle's length
+will be at most the number of bytes given.
+
+The filehandle will be represented in hex with a leading '\ex'.
+
+.TP
+.B clients/
+This directory contains a subdirectory for each NFSv4 client.  Each file
+under that subdirectory gives some details about the client in YAML
+format.  In addition, writing "expire\\n" to the
+.B ctl
+file will force the server to immediately revoke all state held by that
+client.
+
+.PP
+The directory
+.B /proc/net/rpc
+in the
+.B procfs
+filesystem contains a number of files and directories.
+The files contain statistics that can be display using the
+.I nfsstat
+program.
+The directories contain information about various caches that the NFS
+server maintains to keep track of access permissions that different
+clients have for different filesystems.
+The caches are:
+
+.TP
+.B auth.unix.ip
+This cache contains a mapping from IP address to the name of the
+authentication domain that the ipaddress should be treated as part of.
+
+.TP
+.B nfsd.export
+This cache contains a mapping from directory and domain to export
+options.
+
+.TP
+.B nfsd.fh
+This cache contains a mapping from domain and a filesystem identifier
+to a directory.   The filesystem identifier is stored in the
+filehandles and consists of a number indicating the type of identifier
+and a number of hex bytes indicating the content of the identifier.
+
+.PP
+Each directory representing a cache can hold from 1 to 3 files.  They
+are:
+.TP
+.B flush
+When a number of seconds since epoch (1 Jan 1970) is written to this
+file, all entries in the cache that were last updated before that file
+become invalidated and will be flushed out.  Writing a time in the
+future (in seconds since epoch) will flush
+everything.  This is the only file that will always be present.
+
+.TP
+.B content
+This file, if present, contains a textual representation of ever entry
+in the cache, one per line.  If an entry is still in the cache
+(because it is actively being used) but has expired or is otherwise
+invalid, it will be presented as a comment (with a leading hash
+character).
+
+.TP
+.B channel
+This file, if present, acts a channel for request from the kernel-based
+nfs server to be passed to a user-space program for handling.
+
+When the kernel needs some information which isn't in the cache, it
+makes a line appear in the
+.B channel
+file giving the key for the information.  A user-space program should
+read this, find the answer, and write a line containing the key, an
+expiry time, and the content.
+For example the kernel might make
+.ti +5
+nfsd 127.0.0.1
+.br
+appear in the
+.B auth.unix.ip/content
+file.  The user-space program might then write
+.ti +5
+nfsd 127.0.0.1 1057206953 localhost
+.br
+to indicate that 127.0.0.1 should map to localhost, at least for now.
+
+If the program uses select(2) or poll(2) to discover if it can read
+from the
+.B channel
+then it will never see and end-of-file but when all requests have been
+answered, it will block until another request appears.
+
+.PP
+In the
+.B /proc
+filesystem there are 4 files that can be used to enabled extra tracing
+of nfsd and related code.  They are:
+.in +5
+.B /proc/sys/sunrpc/nfs_debug
+.br
+.B /proc/sys/sunrpc/nfsd_debug
+.br
+.B /proc/sys/sunrpc/nlm_debug
+.br
+.B /proc/sys/sunrpc/rpc_debug
+.br
+.in -5
+They control tracing for the NFS client, the NFS server, the Network
+Lock Manager (lockd) and the underlying RPC layer respectively.
+Decimal numbers can be read from or written to these files.  Each
+number represents a bit-pattern where bits that are set cause certain
+classes of tracing to be enabled.  Consult the kernel header files to
+find out what number correspond to what tracing.
+
+.SH NOTES
+This file system is only available in Linux 2.6 and later series
+kernels (and in the later parts of the 2.5 development series leading
+up to 2.6).  This man page does not apply to 2.4 and earlier.
+.P
+Previously the nfsctl systemcall was used for communication between nfsd
+and user utilities.  That systemcall was removed in kernel version 3.1.
+Older nfs-utils versions were able to fall back to nfsctl if necessary;
+that was removed from nfs-utils 1.3.5.
+
+.SH SEE ALSO
+.BR nfsd (8),
+.BR rpc.nfsd (8),
+.BR exports (5),
+.BR nfsstat (8),
+.BR mountd (8)
+.BR exportfs (8).
+
+.SH AUTHOR
+NeilBrown