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

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

9 files changed, 2169 insertions, 0 deletions

diff --git a/support/misc/Makefile.am b/support/misc/Makefile.am
new file mode 100644
index 0000000..f9993e3
--- /dev/null
+++ b/support/misc/Makefile.am
@@ -0,0 +1,7 @@
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+		    nfsd_path.c workqueue.c xstat.c
+
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diff --git a/support/misc/Makefile.in b/support/misc/Makefile.in
new file mode 100644
index 0000000..0636156
--- /dev/null
+++ b/support/misc/Makefile.in
@@ -0,0 +1,712 @@
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+	-rm -rf .libs _libs
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-am
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LIBRARIES)
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/file.Po
+	-rm -f ./$(DEPDIR)/from_local.Po
+	-rm -f ./$(DEPDIR)/mountpoint.Po
+	-rm -f ./$(DEPDIR)/nfsd_path.Po
+	-rm -f ./$(DEPDIR)/tcpwrapper.Po
+	-rm -f ./$(DEPDIR)/workqueue.Po
+	-rm -f ./$(DEPDIR)/xstat.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/file.Po
+	-rm -f ./$(DEPDIR)/from_local.Po
+	-rm -f ./$(DEPDIR)/mountpoint.Po
+	-rm -f ./$(DEPDIR)/nfsd_path.Po
+	-rm -f ./$(DEPDIR)/tcpwrapper.Po
+	-rm -f ./$(DEPDIR)/workqueue.Po
+	-rm -f ./$(DEPDIR)/xstat.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# 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/support/misc/file.c b/support/misc/file.c
new file mode 100644
index 0000000..06f6bb2
--- /dev/null
+++ b/support/misc/file.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright 2009 Oracle.  All rights reserved.
+ * Copyright 2017 Red Hat, Inc.  All rights reserved.
+ *
+ * This file is part of nfs-utils.
+ *
+ * nfs-utils 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 of the License, or
+ * (at your option) any later version.
+ *
+ * nfs-utils 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with nfs-utils.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/stat.h>
+
+#include <string.h>
+#include <libgen.h>
+#include <stdio.h>
+#include <errno.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <limits.h>
+
+#include "xlog.h"
+#include "misc.h"
+
+/*
+ * Returns a dynamically allocated, '\0'-terminated buffer
+ * containing an appropriate pathname, or NULL if an error
+ * occurs.  Caller must free the returned result with free(3).
+ */
+__attribute__((__malloc__))
+char *
+generic_make_pathname(const char *base, const char *leaf)
+{
+	size_t size;
+	char *path;
+	int len;
+
+	size = strlen(base) + strlen(leaf) + 2;
+	if (size > PATH_MAX)
+		return NULL;
+
+	path = malloc(size);
+	if (path == NULL)
+		return NULL;
+
+	len = snprintf(path, size, "%s/%s", base, leaf);
+	if ((len < 0) || ((size_t)len >= size)) {
+		free(path);
+		return NULL;
+	}
+
+	return path;
+}
+
+
+/**
+ * generic_setup_basedir - set up basedir
+ * @progname: C string containing name of program, for error messages
+ * @parentdir: C string containing pathname to on-disk state, or NULL
+ * @base: character buffer to contain the basedir that is set up
+ * @baselen: size of @base in bytes
+ *
+ * This runs before logging is set up, so error messages are directed
+ * to stderr.
+ *
+ * Returns true and sets up our basedir, if @parentdir was valid
+ * and usable; otherwise false is returned.
+ */
+_Bool
+generic_setup_basedir(const char *progname, const char *parentdir, char *base,
+		      const size_t baselen)
+{
+	static char buf[PATH_MAX];
+	struct stat st;
+	char *path;
+
+	/* First: test length of name and whether it exists */
+	if ((strlen(parentdir) >= baselen) || (strlen(parentdir) >= PATH_MAX)) {
+		(void)fprintf(stderr, "%s: Directory name too long: %s",
+				progname, parentdir);
+		return false;
+	}
+	if (lstat(parentdir, &st) == -1) {
+		(void)fprintf(stderr, "%s: Failed to stat %s: %s",
+				progname, parentdir, strerror(errno));
+		return false;
+	}
+
+	/* Ensure we have a clean directory pathname */
+	strncpy(buf, parentdir, sizeof(buf)-1);
+	path = dirname(buf);
+	if (*path == '.') {
+		(void)fprintf(stderr, "%s: Unusable directory %s",
+				progname, parentdir);
+		return false;
+	}
+
+	xlog(D_CALL, "Using %s as the state directory", parentdir);
+	strcpy(base, parentdir);
+	return true;
+}
diff --git a/support/misc/from_local.c b/support/misc/from_local.c
new file mode 100644
index 0000000..e2de969
--- /dev/null
+++ b/support/misc/from_local.c
@@ -0,0 +1,268 @@
+ /*
+  * Check if an address belongs to the local system. Adapted from:
+  * 
+  * @(#)pmap_svc.c 1.32 91/03/11 Copyright 1984,1990 Sun Microsystems, Inc.
+  * @(#)get_myaddress.c  2.1 88/07/29 4.0 RPCSRC.
+  */
+
+/*
+ * Copyright (c) 2009, Sun Microsystems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - 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.
+ * - Neither the name of Sun Microsystems, Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ */
+
+#if 0
+static char sccsid[] = "@(#) from_local.c 1.3 96/05/31 15:52:57";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sockaddr.h"
+#include "tcpwrapper.h"
+#include "xlog.h"
+
+#ifndef TRUE
+#define	TRUE	1
+#define FALSE	0
+#endif
+
+#ifdef HAVE_GETIFADDRS
+
+#include <ifaddrs.h>
+#include <time.h>
+
+/**
+ * from_local - determine whether request comes from the local system
+ * @sap: pointer to socket address to check
+ *
+ * With virtual hosting, each hardware network interface can have
+ * multiple network addresses. On such machines the number of machine
+ * addresses can be surprisingly large.
+ *
+ * We also expect the local network configuration to change over time,
+ * so call getifaddrs(3) more than once, but not too often.
+ *
+ * Returns TRUE if the sockaddr contains an address of one of the local
+ * network interfaces.  Otherwise FALSE is returned.
+ */
+int
+from_local(const struct sockaddr *sap)
+{
+	static struct ifaddrs *ifaddr = NULL;
+	static time_t last_update = 0;
+	struct ifaddrs *ifa;
+	unsigned int count;
+	time_t now;
+
+	if (time(&now) == ((time_t)-1)) {
+		xlog(L_ERROR, "%s: time(2): %m", __func__);
+
+		/* If we don't know what time it is, use the
+		 * existing ifaddr list, if one exists  */
+		now = last_update;
+		if (ifaddr == NULL)
+			now++;
+	}
+	if (now != last_update) {
+		xlog(D_GENERAL, "%s: updating local if addr list", __func__);
+
+		if (ifaddr)
+			freeifaddrs(ifaddr);
+
+		if (getifaddrs(&ifaddr) == -1) {
+			xlog(L_ERROR, "%s: getifaddrs(3): %m", __func__);
+			return FALSE;
+		}
+
+		last_update = now;
+	}
+
+	count = 0;
+	for (ifa = ifaddr; ifa; ifa = ifa->ifa_next) {
+		if ((ifa->ifa_flags & IFF_UP) &&
+		    nfs_compare_sockaddr(sap, ifa->ifa_addr)) {
+			xlog(D_GENERAL, "%s: incoming address matches "
+					"local interface address", __func__);
+			return TRUE;
+		} else
+			count++;
+	}
+
+	xlog(D_GENERAL, "%s: checked %u local if addrs; "
+			"incoming address not found", __func__, count);
+	return FALSE;
+}
+
+#else	/* !HAVE_GETIFADDRS */
+
+static int num_local;
+static int num_addrs;
+static struct in_addr *addrs;
+
+/* grow_addrs - extend list of local interface addresses */
+
+static int grow_addrs(void)
+{
+    struct in_addr *new_addrs;
+    int     new_num;
+
+    /*
+     * Keep the previous result if we run out of memory. The system would
+     * really get hosed if we simply give up.
+     */
+    new_num = (addrs == 0) ? 1 : num_addrs + num_addrs;
+    new_addrs = (struct in_addr *) malloc(sizeof(*addrs) * new_num);
+    if (new_addrs == 0) {
+	xlog_warn("%s: out of memory", __func__);
+	return (0);
+    } else {
+	if (addrs != 0) {
+	    memcpy((char *) new_addrs, (char *) addrs,
+		   sizeof(*addrs) * num_addrs);
+	    free((char *) addrs);
+	}
+	num_addrs = new_num;
+	addrs = new_addrs;
+	return (1);
+    }
+}
+
+/* find_local - find all IP addresses for this host */
+static int
+find_local(void)
+{
+    struct ifconf ifc;
+    struct ifreq ifreq;
+    struct ifreq *ifr;
+    struct ifreq *the_end;
+    int     sock;
+    char    buf[BUFSIZ];
+
+    /*
+     * Get list of network interfaces. We use a huge buffer to allow for the
+     * presence of non-IP interfaces.
+     */
+
+    if ((sock = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
+	xlog_warn("%s: socket(2): %m", __func__);
+	return (0);
+    }
+    ifc.ifc_len = sizeof(buf);
+    ifc.ifc_buf = buf;
+    if (ioctl(sock, SIOCGIFCONF, (char *) &ifc) < 0) {
+	xlog_warn("%s: ioctl(SIOCGIFCONF): %m", __func__);
+	(void) close(sock);
+	return (0);
+    }
+    /* Get IP address of each active IP network interface. */
+
+    the_end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
+    num_local = 0;
+    for (ifr = ifc.ifc_req; ifr < the_end; ifr++) {
+	if (ifr->ifr_addr.sa_family == AF_INET) {	/* IP net interface */
+	    ifreq = *ifr;
+	    if (ioctl(sock, SIOCGIFFLAGS, (char *) &ifreq) < 0) {
+		xlog_warn("%s: ioctl(SIOCGIFFLAGS): %m", __func__);
+	    } else if (ifreq.ifr_flags & IFF_UP) {	/* active interface */
+		if (ioctl(sock, SIOCGIFADDR, (char *) &ifreq) < 0) {
+		    xlog_warn("%s: ioctl(SIOCGIFADDR): %m", __func__);
+		} else {
+		    if (num_local >= num_addrs)
+			if (grow_addrs() == 0)
+			    break;
+		    addrs[num_local++] = ((struct sockaddr_in *)
+					  & ifreq.ifr_addr)->sin_addr;
+		}
+	    }
+	}
+	/* Support for variable-length addresses. */
+#ifdef HAS_SA_LEN
+	ifr = (struct ifreq *) ((caddr_t) ifr
+		      + ifr->ifr_addr.sa_len - sizeof(struct sockaddr));
+#endif
+    }
+    (void) close(sock);
+    return (num_local);
+}
+
+/**
+ * from_local - determine whether request comes from the local system
+ * @sap: pointer to socket address to check
+ *
+ * With virtual hosting, each hardware network interface can have
+ * multiple network addresses. On such machines the number of machine
+ * addresses can be surprisingly large.
+ *
+ * Returns TRUE if the sockaddr contains an address of one of the local
+ * network interfaces.  Otherwise FALSE is returned.
+ */
+int
+from_local(const struct sockaddr *sap)
+{
+    const struct sockaddr_in *addr = (const struct sockaddr_in *)sap;
+    int     i;
+
+    if (sap->sa_family != AF_INET)
+	return (FALSE);
+
+    if (addrs == 0 && find_local() == 0)
+	xlog(L_ERROR, "Cannot find any active local network interfaces");
+
+    for (i = 0; i < num_local; i++) {
+	if (memcmp((char *) &(addr->sin_addr), (char *) &(addrs[i]),
+		   sizeof(struct in_addr)) == 0)
+	    return (TRUE);
+    }
+    return (FALSE);
+}
+
+#ifdef TEST
+
+int main(void)
+{
+    int     i;
+
+    find_local();
+    for (i = 0; i < num_local; i++)
+	printf("%s\n", inet_ntoa(addrs[i]));
+}
+
+#endif	/* TEST */
+
+#endif	/* !HAVE_GETIFADDRS */
diff --git a/support/misc/mountpoint.c b/support/misc/mountpoint.c
new file mode 100644
index 0000000..14d6731
--- /dev/null
+++ b/support/misc/mountpoint.c
@@ -0,0 +1,46 @@
+
+/*
+ * check if a given path is a mountpoint 
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#include "xcommon.h"
+#include <sys/stat.h>
+#include "misc.h"
+
+int
+check_is_mountpoint(const char *path, int (mystat)(const char *, struct stat *))
+{
+	if (!mystat)
+		mystat = lstat;
+	/* Check if 'path' is a current mountpoint.
+	 * Possibly we should also check it is the mountpoint of the 
+	 * filesystem holding the target directory, but there doesn't
+	 * seem a lot of point.
+	 *
+	 * We deem it to be a mountpoint if appending a ".." gives a different
+	 * device or the same inode number.
+	 */
+	char *dotdot;
+	struct stat stb, pstb;
+	int rv;
+
+	dotdot = xmalloc(strlen(path)+4);
+
+	strcat(strcpy(dotdot, path), "/..");
+	if (mystat(path, &stb) != 0 ||
+	    mystat(dotdot, &pstb) != 0)
+		rv = 0;
+	else
+		if (stb.st_dev != pstb.st_dev ||
+		    stb.st_ino == pstb.st_ino)
+			rv = 1;
+		else
+			rv = 0;
+	free(dotdot);
+	return rv;
+}
diff --git a/support/misc/nfsd_path.c b/support/misc/nfsd_path.c
new file mode 100644
index 0000000..c3dea4f
--- /dev/null
+++ b/support/misc/nfsd_path.c
@@ -0,0 +1,409 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/vfs.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "conffile.h"
+#include "xmalloc.h"
+#include "xlog.h"
+#include "xstat.h"
+#include "nfslib.h"
+#include "nfsd_path.h"
+#include "workqueue.h"
+
+static struct xthread_workqueue *nfsd_wq;
+
+static int
+nfsd_path_isslash(const char *path)
+{
+	return path[0] == '/' && path[1] == '/';
+}
+
+static int
+nfsd_path_isdot(const char *path)
+{
+	return path[0] == '.' && path[1] == '/';
+}
+
+static const char *
+nfsd_path_strip(const char *path)
+{
+	if (!path || *path == '\0')
+		goto out;
+	for (;;) {
+		if (nfsd_path_isslash(path)) {
+			path++;
+			continue;
+		}
+		if (nfsd_path_isdot(path)) {
+			path += 2;
+			continue;
+		}
+		break;
+	}
+out:
+	return path;
+}
+
+const char *
+nfsd_path_nfsd_rootdir(void)
+{
+	const char *rootdir;
+
+	rootdir = nfsd_path_strip(conf_get_str("exports", "rootdir"));
+	if (!rootdir || rootdir[0] ==  '\0')
+		return NULL;
+	if (rootdir[0] == '/' && rootdir[1] == '\0')
+		return NULL;
+	return rootdir;
+}
+
+char *
+nfsd_path_strip_root(char *pathname)
+{
+	char buffer[PATH_MAX];
+	const char *dir = nfsd_path_nfsd_rootdir();
+
+	if (!dir)
+		goto out;
+
+	if (realpath(dir, buffer))
+		return strstr(pathname, buffer) == pathname ?
+			pathname + strlen(buffer) : NULL;
+
+	xlog(D_GENERAL, "%s: failed to resolve path %s: %m", __func__, dir);
+out:
+	return pathname;
+}
+
+char *
+nfsd_path_prepend_dir(const char *dir, const char *pathname)
+{
+	size_t len, dirlen;
+	char *ret;
+
+	dirlen = strlen(dir);
+	while (dirlen > 0 && dir[dirlen - 1] == '/')
+		dirlen--;
+	if (!dirlen)
+		return NULL;
+	while (pathname[0] == '/')
+		pathname++;
+	len = dirlen + strlen(pathname) + 1;
+	ret = xmalloc(len + 1);
+	snprintf(ret, len+1, "%.*s/%s", (int)dirlen, dir, pathname);
+	return ret;
+}
+
+static void
+nfsd_setup_workqueue(void)
+{
+	const char *rootdir = nfsd_path_nfsd_rootdir();
+
+	if (!rootdir)
+		return;
+
+	nfsd_wq = xthread_workqueue_alloc();
+	if (!nfsd_wq)
+		return;
+	xthread_workqueue_chroot(nfsd_wq, rootdir);
+}
+
+void
+nfsd_path_init(void)
+{
+	nfsd_setup_workqueue();
+}
+
+struct nfsd_stat_data {
+	const char *pathname;
+	struct stat *statbuf;
+	int ret;
+	int err;
+};
+
+static void
+nfsd_statfunc(void *data)
+{
+	struct nfsd_stat_data *d = data;
+
+	d->ret = xstat(d->pathname, d->statbuf);
+	if (d->ret < 0)
+		d->err = errno;
+}
+
+static void
+nfsd_lstatfunc(void *data)
+{
+	struct nfsd_stat_data *d = data;
+
+	d->ret = xlstat(d->pathname, d->statbuf);
+	if (d->ret < 0)
+		d->err = errno;
+}
+
+static int
+nfsd_run_stat(struct xthread_workqueue *wq,
+		void (*func)(void *),
+		const char *pathname,
+		struct stat *statbuf)
+{
+	struct nfsd_stat_data data = {
+		pathname,
+		statbuf,
+		0,
+		0
+	};
+	xthread_work_run_sync(wq, func, &data);
+	if (data.ret < 0)
+		errno = data.err;
+	return data.ret;
+}
+
+int
+nfsd_path_stat(const char *pathname, struct stat *statbuf)
+{
+	if (!nfsd_wq)
+		return xstat(pathname, statbuf);
+	return nfsd_run_stat(nfsd_wq, nfsd_statfunc, pathname, statbuf);
+}
+
+int
+nfsd_path_lstat(const char *pathname, struct stat *statbuf)
+{
+	if (!nfsd_wq)
+		return xlstat(pathname, statbuf);
+	return nfsd_run_stat(nfsd_wq, nfsd_lstatfunc, pathname, statbuf);
+}
+
+struct nfsd_statfs_data {
+	const char *pathname;
+	struct statfs *statbuf;
+	int ret;
+	int err;
+};
+
+static void
+nfsd_statfsfunc(void *data)
+{
+	struct nfsd_statfs_data *d = data;
+
+	d->ret = statfs(d->pathname, d->statbuf);
+	if (d->ret < 0)
+		d->err = errno;
+}
+
+static int
+nfsd_run_statfs(struct xthread_workqueue *wq,
+		  const char *pathname,
+		  struct statfs *statbuf)
+{
+	struct nfsd_statfs_data data = {
+		pathname,
+		statbuf,
+		0,
+		0
+	};
+	xthread_work_run_sync(wq, nfsd_statfsfunc, &data);
+	if (data.ret < 0)
+		errno = data.err;
+	return data.ret;
+}
+
+int
+nfsd_path_statfs(const char *pathname, struct statfs *statbuf)
+{
+	if (!nfsd_wq)
+		return statfs(pathname, statbuf);
+	return nfsd_run_statfs(nfsd_wq, pathname, statbuf);
+}
+
+struct nfsd_realpath_data {
+	const char *pathname;
+	char *resolved;
+	int err;
+};
+
+static void
+nfsd_realpathfunc(void *data)
+{
+	struct nfsd_realpath_data *d = data;
+
+	d->resolved = realpath(d->pathname, d->resolved);
+	if (!d->resolved)
+		d->err = errno;
+}
+
+char *
+nfsd_realpath(const char *path, char *resolved_path)
+{
+	struct nfsd_realpath_data data = {
+		path,
+		resolved_path,
+		0
+	};
+
+	if (!nfsd_wq)
+		return realpath(path, resolved_path);
+
+	xthread_work_run_sync(nfsd_wq, nfsd_realpathfunc, &data);
+	if (!data.resolved)
+		errno = data.err;
+	return data.resolved;
+}
+
+struct nfsd_read_data {
+	int fd;
+	char *buf;
+	size_t len;
+	ssize_t ret;
+	int err;
+};
+
+static void
+nfsd_readfunc(void *data)
+{
+	struct nfsd_read_data *d = data;
+
+	d->ret = read(d->fd, d->buf, d->len);
+	if (d->ret < 0)
+		d->err = errno;
+}
+
+static ssize_t
+nfsd_run_read(struct xthread_workqueue *wq, int fd, char *buf, size_t len)
+{
+	struct nfsd_read_data data = {
+		fd,
+		buf,
+		len,
+		0,
+		0
+	};
+	xthread_work_run_sync(wq, nfsd_readfunc, &data);
+	if (data.ret < 0)
+		errno = data.err;
+	return data.ret;
+}
+
+ssize_t
+nfsd_path_read(int fd, char *buf, size_t len)
+{
+	if (!nfsd_wq)
+		return read(fd, buf, len);
+	return nfsd_run_read(nfsd_wq, fd, buf, len);
+}
+
+struct nfsd_write_data {
+	int fd;
+	const char *buf;
+	size_t len;
+	ssize_t ret;
+	int err;
+};
+
+static void
+nfsd_writefunc(void *data)
+{
+	struct nfsd_write_data *d = data;
+
+	d->ret = write(d->fd, d->buf, d->len);
+	if (d->ret < 0)
+		d->err = errno;
+}
+
+static ssize_t
+nfsd_run_write(struct xthread_workqueue *wq, int fd, const char *buf, size_t len)
+{
+	struct nfsd_write_data data = {
+		fd,
+		buf,
+		len,
+		0,
+		0
+	};
+	xthread_work_run_sync(wq, nfsd_writefunc, &data);
+	if (data.ret < 0)
+		errno = data.err;
+	return data.ret;
+}
+
+ssize_t
+nfsd_path_write(int fd, const char *buf, size_t len)
+{
+	if (!nfsd_wq)
+		return write(fd, buf, len);
+	return nfsd_run_write(nfsd_wq, fd, buf, len);
+}
+
+#if defined(HAVE_NAME_TO_HANDLE_AT)
+struct nfsd_handle_data {
+	int fd;
+	const char *path;
+	struct file_handle *fh;
+	int *mount_id;
+	int flags;
+	int ret;
+	int err;
+};
+
+static void
+nfsd_name_to_handle_func(void *data)
+{
+	struct nfsd_handle_data *d = data;
+
+	d->ret = name_to_handle_at(d->fd, d->path,
+			d->fh, d->mount_id, d->flags);
+	if (d->ret < 0)
+		d->err = errno;
+}
+
+static int
+nfsd_run_name_to_handle_at(struct xthread_workqueue *wq,
+		int fd, const char *path, struct file_handle *fh,
+		int *mount_id, int flags)
+{
+	struct nfsd_handle_data data = {
+		fd,
+		path,
+		fh,
+		mount_id,
+		flags,
+		0,
+		0
+	};
+
+	xthread_work_run_sync(wq, nfsd_name_to_handle_func, &data);
+	if (data.ret < 0)
+		errno = data.err;
+	return data.ret;
+}
+
+int
+nfsd_name_to_handle_at(int fd, const char *path, struct file_handle *fh,
+		int *mount_id, int flags)
+{
+	if (!nfsd_wq)
+		return name_to_handle_at(fd, path, fh, mount_id, flags);
+
+	return nfsd_run_name_to_handle_at(nfsd_wq, fd, path, fh,
+			mount_id, flags);
+}
+#else
+int
+nfsd_name_to_handle_at(int UNUSED(fd), const char *UNUSED(path),
+		struct file_handle *UNUSED(fh),
+		int *UNUSED(mount_id), int UNUSED(flags))
+{
+	errno = ENOSYS;
+	return -1;
+}
+#endif
diff --git a/support/misc/tcpwrapper.c b/support/misc/tcpwrapper.c
new file mode 100644
index 0000000..3128053
--- /dev/null
+++ b/support/misc/tcpwrapper.c
@@ -0,0 +1,270 @@
+/* This is copied from portmap 4.0-29 in RedHat. */
+
+ /*
+  * pmap_check - additional portmap security.
+  * 
+  * Always reject non-local requests to update the portmapper tables.
+  * 
+  * Refuse to forward mount requests to the nfs mount daemon. Otherwise, the
+  * requests would appear to come from the local system, and nfs export
+  * restrictions could be bypassed.
+  * 
+  * Refuse to forward requests to the nfsd process.
+  * 
+  * Refuse to forward requests to NIS (YP) daemons; The only exception is the
+  * YPPROC_DOMAIN_NONACK broadcast rpc call that is used to establish initial
+  * contact with the NIS server.
+  * 
+  * Always allocate an unprivileged port when forwarding a request.
+  * 
+  * If compiled with -DCHECK_PORT, require that requests to register or
+  * unregister a privileged port come from a privileged port. This makes it
+  * more difficult to replace a critical service by a trojan.
+  * 
+  * If compiled with -DHOSTS_ACCESS, reject requests from hosts that are not
+  * authorized by the /etc/hosts.{allow,deny} files. The local system is
+  * always treated as an authorized host. The access control tables are never
+  * consulted for requests from the local system, and are always consulted
+  * for requests from other hosts.
+  * 
+  * Author: Wietse Venema (wietse@wzv.win.tue.nl), dept. of Mathematics and
+  * Computing Science, Eindhoven University of Technology, The Netherlands.
+  */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifdef HAVE_LIBWRAP
+#include <unistd.h>
+#include <string.h>
+#include <rpc/rpc.h>
+#include <rpc/pmap_prot.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <sys/types.h>
+#include <sys/signal.h>
+#include <sys/queue.h>
+#include <sys/stat.h>
+#include <tcpd.h>
+
+#include "sockaddr.h"
+#include "tcpwrapper.h"
+#include "xlog.h"
+
+#ifdef SYSV40
+#include <netinet/in.h>
+#include <rpc/rpcent.h>
+#endif	/* SYSV40 */
+
+#define ALLOW 1
+#define DENY 0
+
+#ifdef IPV6_SUPPORTED
+static void
+present_address(const struct sockaddr *sap, char *buf, const size_t buflen)
+{
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
+	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
+	socklen_t len = (socklen_t)buflen;
+
+	switch (sap->sa_family) {
+	case AF_INET:
+		if (inet_ntop(AF_INET, &sin->sin_addr, buf, len) != 0)
+			return;
+		break;
+	case AF_INET6:
+		if (inet_ntop(AF_INET6, &sin6->sin6_addr, buf, len) != 0)
+			return;
+	}
+
+	memset(buf, 0, buflen);
+	strncpy(buf, "unrecognized caller", buflen);
+}
+#else	/* !IPV6_SUPPORTED */
+static void
+present_address(const struct sockaddr *sap, char *buf, const size_t buflen)
+{
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
+	socklen_t len = (socklen_t)buflen;
+
+	if (sap->sa_family == AF_INET)
+		if (inet_ntop(AF_INET, &sin->sin_addr, buf, len) != 0)
+			return;
+
+	memset(buf, 0, buflen);
+	strncpy(buf, "unrecognized caller", (size_t)buflen);
+}
+#endif	/* !IPV6_SUPPORTED */
+
+typedef struct _haccess_t {
+	TAILQ_ENTRY(_haccess_t)	list;
+	int			allowed;
+	union nfs_sockaddr	address;
+} haccess_t;
+
+#define HASH_TABLE_SIZE 1021
+typedef struct _hash_head {
+	TAILQ_HEAD(host_list, _haccess_t) h_head;
+} hash_head;
+
+static hash_head haccess_tbl[HASH_TABLE_SIZE];
+
+static unsigned long
+strtoint(const char *str)
+{
+	unsigned long i, n = 0;
+	size_t len = strlen(str);
+
+	for (i = 0; i < len; i++)
+		n += (unsigned char)str[i] * i;
+
+	return n;
+}
+
+static unsigned int
+hashint(const unsigned long num)
+{
+	return (unsigned int)(num % HASH_TABLE_SIZE);
+}
+
+static unsigned int
+HASH(const char *addr, const unsigned long program)
+{
+	return hashint(strtoint(addr) + program);
+}
+
+static void
+haccess_add(const struct sockaddr *sap, const char *address,
+		const unsigned long program, const int allowed)
+{
+	hash_head *head;
+	haccess_t *hptr;
+	unsigned int hash;
+
+	hptr = (haccess_t *)malloc(sizeof(haccess_t));
+	if (hptr == NULL)
+		return;
+
+	hash = HASH(address, program);
+	head = &(haccess_tbl[hash]);
+
+	hptr->allowed = allowed;
+	memcpy(&hptr->address, sap, (size_t)nfs_sockaddr_length(sap));
+
+	if (TAILQ_EMPTY(&head->h_head))
+		TAILQ_INSERT_HEAD(&head->h_head, hptr, list);
+	else
+		TAILQ_INSERT_TAIL(&head->h_head, hptr, list);
+}
+
+static haccess_t *
+haccess_lookup(const struct sockaddr *sap, const char *address,
+		const unsigned long program)
+{
+	hash_head *head;
+	haccess_t *hptr;
+	unsigned int hash;
+
+	hash = HASH(address, program);
+	head = &(haccess_tbl[hash]);
+
+	TAILQ_FOREACH(hptr, &head->h_head, list) {
+		if (nfs_compare_sockaddr(&hptr->address.sa, sap))
+			return hptr;
+	}
+	return NULL;
+}
+
+static void
+logit(const char *address)
+{
+	xlog_warn("connect from %s denied: request from unauthorized host",
+			address);
+}
+
+static int
+good_client(char *name, struct sockaddr *sap)
+{
+	struct request_info req;
+
+	request_init(&req, RQ_DAEMON, name, RQ_CLIENT_SIN, sap, 0);
+	sock_methods(&req);
+
+	if (hosts_access(&req)) 
+		return ALLOW;
+
+	return DENY;
+}
+
+static int
+check_files(void)
+{
+	static time_t allow_mtime, deny_mtime;
+	struct stat astat, dstat;
+	int changed = 0;
+
+	if (stat("/etc/hosts.allow", &astat) < 0)
+		astat.st_mtime = 0;
+	if (stat("/etc/hosts.deny", &dstat) < 0)
+		dstat.st_mtime = 0;
+
+	if(!astat.st_mtime || !dstat.st_mtime)
+		return changed;
+
+	if (astat.st_mtime != allow_mtime)
+		changed = 1;
+	else if (dstat.st_mtime != deny_mtime)
+		changed = 1;
+
+	allow_mtime = astat.st_mtime;
+	deny_mtime = dstat.st_mtime;
+
+	return changed;
+}
+
+/**
+ * check_default - additional checks for NULL, DUMP, GETPORT and unknown
+ * @name: pointer to '\0'-terminated ASCII string containing name of the
+ *		daemon requesting the access check
+ * @sap: pointer to sockaddr containing network address of caller
+ * @program: RPC program number caller is attempting to access
+ *
+ * Returns TRUE if the caller is allowed access; otherwise FALSE is returned.
+ */
+int
+check_default(char *name, struct sockaddr *sap, const unsigned long program)
+{
+	haccess_t *acc = NULL;
+	int changed = check_files();
+	char buf[INET6_ADDRSTRLEN];
+
+	present_address(sap, buf, sizeof(buf));
+
+	acc = haccess_lookup(sap, buf, program);
+	if (acc != NULL && changed == 0) {
+		xlog(D_GENERAL, "%s: access by %s %s (cached)", __func__,
+			buf, acc->allowed ? "ALLOWED" : "DENIED");
+		return acc->allowed;
+	}
+
+	if (!(from_local(sap) || good_client(name, sap))) {
+		logit(buf);
+		if (acc != NULL)
+			acc->allowed = FALSE;
+		else
+			haccess_add(sap, buf, program, FALSE);
+		xlog(D_GENERAL, "%s: access by %s DENIED", __func__, buf);
+		return (FALSE);
+	}
+
+	if (acc != NULL)
+		acc->allowed = TRUE;
+	else
+		haccess_add(sap, buf, program, TRUE);
+	xlog(D_GENERAL, "%s: access by %s ALLOWED", __func__, buf);
+
+	return (TRUE);
+}
+
+#endif	/* HAVE_LIBWRAP */
diff --git a/support/misc/workqueue.c b/support/misc/workqueue.c
new file mode 100644
index 0000000..8043268
--- /dev/null
+++ b/support/misc/workqueue.c
@@ -0,0 +1,228 @@
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "workqueue.h"
+#include "xlog.h"
+
+#if defined(HAVE_SCHED_H) && defined(HAVE_LIBPTHREAD) && defined(HAVE_UNSHARE)
+#include <sched.h>
+#include <pthread.h>
+
+struct xwork_struct {
+	struct xwork_struct *next;
+	void (*fn)(void *);
+	void *data;
+};
+
+struct xwork_queue {
+	struct xwork_struct *head;
+	struct xwork_struct **tail;
+
+	unsigned char shutdown : 1;
+};
+
+static void xwork_queue_init(struct xwork_queue *queue)
+{
+	queue->head = NULL;
+	queue->tail = &queue->head;
+	queue->shutdown = 0;
+}
+
+static void xwork_enqueue(struct xwork_queue *queue,
+		struct xwork_struct *entry)
+{
+	entry->next = NULL;
+	*queue->tail = entry;
+	queue->tail = &entry->next;
+}
+
+static struct xwork_struct *xwork_dequeue(struct xwork_queue *queue)
+{
+	struct xwork_struct *entry = NULL;
+	if (queue->head) {
+		entry = queue->head;
+		queue->head = entry->next;
+		if (!queue->head)
+			queue->tail = &queue->head;
+	}
+	return entry;
+}
+
+struct xthread_work {
+	struct xwork_struct work;
+
+	pthread_cond_t cond;
+};
+
+struct xthread_workqueue {
+	struct xwork_queue queue;
+
+	pthread_mutex_t mutex;
+	pthread_cond_t cond;
+};
+
+static void xthread_workqueue_init(struct xthread_workqueue *wq)
+{
+	xwork_queue_init(&wq->queue);
+	pthread_mutex_init(&wq->mutex, NULL);
+	pthread_cond_init(&wq->cond, NULL);
+}
+
+static void xthread_workqueue_fini(struct xthread_workqueue *wq)
+{
+	pthread_cond_destroy(&wq->cond);
+	pthread_mutex_destroy(&wq->mutex);
+}
+
+static int xthread_work_enqueue(struct xthread_workqueue *wq,
+		struct xthread_work *work)
+{
+	xwork_enqueue(&wq->queue, &work->work);
+	pthread_cond_signal(&wq->cond);
+	return 0;
+}
+
+static struct xthread_work *xthread_work_dequeue(struct xthread_workqueue *wq)
+{
+	return (struct xthread_work *)xwork_dequeue(&wq->queue);
+}
+
+static void xthread_workqueue_do_work(struct xthread_workqueue *wq)
+{
+	struct xthread_work *work;
+
+	pthread_mutex_lock(&wq->mutex);
+	/* Signal the caller that we're up and running */
+	pthread_cond_signal(&wq->cond);
+	for (;;) {
+		work = xthread_work_dequeue(wq);
+		if (work) {
+			work->work.fn(work->work.data);
+			pthread_cond_signal(&work->cond);
+			continue;
+		}
+		if (wq->queue.shutdown)
+			break;
+		pthread_cond_wait(&wq->cond, &wq->mutex);
+	}
+	pthread_mutex_unlock(&wq->mutex);
+}
+
+void xthread_workqueue_shutdown(struct xthread_workqueue *wq)
+{
+	pthread_mutex_lock(&wq->mutex);
+	wq->queue.shutdown = 1;
+	pthread_cond_signal(&wq->cond);
+	pthread_mutex_unlock(&wq->mutex);
+}
+
+static void xthread_workqueue_free(struct xthread_workqueue *wq)
+{
+	xthread_workqueue_fini(wq);
+	free(wq);
+}
+
+static void xthread_workqueue_cleanup(void *data)
+{
+	xthread_workqueue_free(data);
+}
+
+static void *xthread_workqueue_worker(void *data)
+{
+	pthread_cleanup_push(xthread_workqueue_cleanup, data);
+	xthread_workqueue_do_work(data);
+	pthread_cleanup_pop(1);
+	return NULL;
+}
+
+struct xthread_workqueue *xthread_workqueue_alloc(void)
+{
+	struct xthread_workqueue *ret;
+	pthread_t thread;
+
+	ret = malloc(sizeof(*ret));
+	if (ret) {
+		xthread_workqueue_init(ret);
+
+		pthread_mutex_lock(&ret->mutex);
+		if (pthread_create(&thread, NULL,
+					xthread_workqueue_worker,
+					ret) == 0) {
+			/* Wait for thread to start */
+			pthread_cond_wait(&ret->cond, &ret->mutex);
+			pthread_mutex_unlock(&ret->mutex);
+			return ret;
+		}
+		pthread_mutex_unlock(&ret->mutex);
+		xthread_workqueue_free(ret);
+		ret = NULL;
+	}
+	return NULL;
+}
+
+void xthread_work_run_sync(struct xthread_workqueue *wq,
+		void (*fn)(void *), void *data)
+{
+	struct xthread_work work = {
+		{
+			NULL,
+			fn,
+			data
+		},
+		PTHREAD_COND_INITIALIZER,
+	};
+	pthread_mutex_lock(&wq->mutex);
+	xthread_work_enqueue(wq, &work);
+	pthread_cond_wait(&work.cond, &wq->mutex);
+	pthread_mutex_unlock(&wq->mutex);
+	pthread_cond_destroy(&work.cond);
+}
+
+static void xthread_workqueue_do_chroot(void *data)
+{
+	const char *path = data;
+
+	if (unshare(CLONE_FS) != 0) {
+		xlog_err("unshare() failed: %m");
+		return;
+	}
+	if (chroot(path) != 0)
+		xlog_err("chroot(%s) failed: %m", path);
+}
+
+void xthread_workqueue_chroot(struct xthread_workqueue *wq,
+		const char *path)
+{
+	xthread_work_run_sync(wq, xthread_workqueue_do_chroot, (void *)path);
+}
+
+#else
+
+struct xthread_workqueue {
+};
+
+static struct xthread_workqueue ret;
+
+struct xthread_workqueue *xthread_workqueue_alloc(void)
+{
+	return &ret;
+}
+
+void xthread_workqueue_shutdown(struct xthread_workqueue *wq)
+{
+}
+
+void xthread_work_run_sync(struct xthread_workqueue *wq,
+		void (*fn)(void *), void *data)
+{
+	fn(data);
+}
+
+void xthread_workqueue_chroot(struct xthread_workqueue *wq,
+		const char *path)
+{
+	xlog_err("Unable to run as chroot");
+}
+
+#endif /* defined(HAVE_SCHED_H) && defined(HAVE_LIBPTHREAD) && defined(HAVE_UNSHARE) */
diff --git a/support/misc/xstat.c b/support/misc/xstat.c
new file mode 100644
index 0000000..6f751f7
--- /dev/null
+++ b/support/misc/xstat.c
@@ -0,0 +1,114 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <errno.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <unistd.h>
+
+#include "nfslib.h"
+#include "xstat.h"
+
+#ifdef HAVE_FSTATAT
+#ifdef HAVE_STATX
+
+static void
+statx_copy(struct stat *stbuf, const struct statx *stxbuf)
+{
+	stbuf->st_dev = makedev(stxbuf->stx_dev_major, stxbuf->stx_dev_minor);
+	stbuf->st_ino = stxbuf->stx_ino;
+	stbuf->st_mode = stxbuf->stx_mode;
+	stbuf->st_nlink = stxbuf->stx_nlink;
+	stbuf->st_uid = stxbuf->stx_uid;
+	stbuf->st_gid = stxbuf->stx_gid;
+	stbuf->st_rdev = makedev(stxbuf->stx_rdev_major, stxbuf->stx_rdev_minor);
+	stbuf->st_size = stxbuf->stx_size;
+	stbuf->st_blksize = stxbuf->stx_blksize;
+	stbuf->st_blocks = stxbuf->stx_blocks;
+	stbuf->st_atim.tv_sec = stxbuf->stx_atime.tv_sec;
+	stbuf->st_atim.tv_nsec = stxbuf->stx_atime.tv_nsec;
+	stbuf->st_mtim.tv_sec = stxbuf->stx_mtime.tv_sec;
+	stbuf->st_mtim.tv_nsec = stxbuf->stx_mtime.tv_nsec;
+	stbuf->st_ctim.tv_sec = stxbuf->stx_ctime.tv_sec;
+	stbuf->st_ctim.tv_nsec = stxbuf->stx_ctime.tv_nsec;
+}
+
+static int
+statx_do_stat(int fd, const char *pathname, struct stat *statbuf, int flags)
+{
+	static int statx_supported = 1;
+	struct statx stxbuf;
+	int ret;
+
+	if (statx_supported) {
+		ret = statx(fd, pathname, flags,
+				STATX_BASIC_STATS,
+				&stxbuf);
+		if (ret == 0) {
+			statx_copy(statbuf, &stxbuf);
+			return 0;
+		}
+		/* glibc emulation doesn't support AT_STATX_DONT_SYNC */
+		if (errno == EINVAL)
+			errno = ENOSYS;
+		if (errno == ENOSYS)
+			statx_supported = 0;
+	} else
+		errno = ENOSYS;
+	return -1;
+}
+
+static int
+statx_stat_nosync(int fd, const char *pathname, struct stat *statbuf, int flags)
+{
+	return statx_do_stat(fd, pathname, statbuf, flags | AT_STATX_DONT_SYNC);
+}
+
+#else
+
+static int
+statx_stat_nosync(int UNUSED(fd), const char *UNUSED(pathname), struct stat *UNUSED(statbuf), int UNUSED(flags))
+{
+	errno = ENOSYS;
+	return -1;
+}
+
+#endif /* HAVE_STATX */
+
+int xlstat(const char *pathname, struct stat *statbuf)
+{
+	if (statx_stat_nosync(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT|
+				AT_SYMLINK_NOFOLLOW) == 0)
+		return 0;
+	else if (errno != ENOSYS)
+		return -1;
+	errno = 0;
+	return fstatat(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT |
+			AT_SYMLINK_NOFOLLOW);
+}
+
+int xstat(const char *pathname, struct stat *statbuf)
+{
+	if (statx_stat_nosync(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT) == 0)
+		return 0;
+	else if (errno != ENOSYS)
+		return -1;
+	errno = 0;
+	return fstatat(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT);
+}
+
+#else
+
+int xlstat(const char *pathname, struct stat *statbuf)
+{
+	return lstat(pathname, statbuf);
+}
+
+int xstat(const char *pathname, struct stat *statbuf)
+{
+	return stat(pathname, statbuf);
+}
+#endif