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

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

21 files changed, 7940 insertions, 0 deletions

diff --git a/utils/nfsd/Makefile.am b/utils/nfsd/Makefile.am
new file mode 100644
index 0000000..8acc9a0
--- /dev/null
+++ b/utils/nfsd/Makefile.am
@@ -0,0 +1,55 @@
+## Process this file with automake to produce Makefile.in
+
+man8_MANS	= nfsd.man
+EXTRA_DIST	= $(man8_MANS)
+
+RPCPREFIX	= rpc.
+KPREFIX		= @kprefix@
+sbin_PROGRAMS	= nfsd
+
+noinst_HEADERS = nfssvc.h
+nfsd_SOURCES = nfsd.c nfssvc.c
+nfsd_LDADD = ../../support/nfs/libnfs.la $(LIBTIRPC)
+
+MAINTAINERCLEANFILES = Makefile.in
+
+#######################################################################
+# The following allows the current practice of having
+# daemons renamed during the install to include RPCPREFIX
+# and the KPREFIX
+# This could all be done much easier with program_transform_name
+# ( program_transform_name = s/^/$(RPCPREFIX)$(KPREFIX)/ )
+# but that also renames the man pages, which the current
+# practice does not do.
+install-exec-hook:
+	(cd $(DESTDIR)$(sbindir) && \
+	  for p in $(sbin_PROGRAMS); do \
+	    mv -f $$p$(EXEEXT) $(RPCPREFIX)$(KPREFIX)$$p$(EXEEXT) ;\
+	  done)
+uninstall-hook:
+	(cd $(DESTDIR)$(sbindir) && \
+	  for p in $(sbin_PROGRAMS); do \
+	    rm -f $(RPCPREFIX)$(KPREFIX)$$p$(EXEEXT) ;\
+	  done)
+
+
+# XXX This makes some assumptions about what automake does.
+# XXX But there is no install-man-hook or install-man-local.
+install-man: install-man8 install-man-links
+uninstall-man: uninstall-man8 uninstall-man-links
+
+install-man-links:
+	(cd $(DESTDIR)$(man8dir) && \
+	  for m in $(man8_MANS) $(dist_man8_MANS) $(nodist_man8_MANS); do \
+	    inst=`echo $$m | sed -e 's/man$$/8/'`; \
+	    rm -f $(RPCPREFIX)$$inst ; \
+	    $(LN_S) $$inst $(RPCPREFIX)$$inst ; \
+	  done)
+
+uninstall-man-links:
+	(cd $(DESTDIR)$(man8dir) && \
+	  for m in $(man8_MANS) $(dist_man8_MANS) $(nodist_man8_MANS); do \
+	    inst=`echo $$m | sed -e 's/man$$/8/'`; \
+	    rm -f $(RPCPREFIX)$$inst ; \
+	  done)
+
diff --git a/utils/nfsd/Makefile.in b/utils/nfsd/Makefile.in
new file mode 100644
index 0000000..853bf55
--- /dev/null
+++ b/utils/nfsd/Makefile.in
@@ -0,0 +1,855 @@
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+
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+	@list='$(sbin_PROGRAMS)'; test -n "$(sbindir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(sbindir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(sbindir)" || exit 1; \
+	fi; \
+	for p in $$list; do echo "$$p $$p"; done | \
+	sed 's/$(EXEEXT)$$//' | \
+	while read p p1; do if test -f $$p \
+	 || test -f $$p1 \
+	  ; then echo "$$p"; echo "$$p"; else :; fi; \
+	done | \
+	sed -e 'p;s,.*/,,;n;h' \
+	    -e 's|.*|.|' \
+	    -e 'p;x;s,.*/,,;s/$(EXEEXT)$$//;$(transform);s/$$/$(EXEEXT)/' | \
+	sed 'N;N;N;s,\n, ,g' | \
+	$(AWK) 'BEGIN { files["."] = ""; dirs["."] = 1 } \
+	  { d=$$3; if (dirs[d] != 1) { print "d", d; dirs[d] = 1 } \
+	    if ($$2 == $$4) files[d] = files[d] " " $$1; \
+	    else { print "f", $$3 "/" $$4, $$1; } } \
+	  END { for (d in files) print "f", d, files[d] }' | \
+	while read type dir files; do \
+	    if test "$$dir" = .; then dir=; else dir=/$$dir; fi; \
+	    test -z "$$files" || { \
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+	    $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files "$(DESTDIR)$(sbindir)$$dir" || exit $$?; \
+	    } \
+	; done
+
+uninstall-sbinPROGRAMS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(sbin_PROGRAMS)'; test -n "$(sbindir)" || list=; \
+	files=`for p in $$list; do echo "$$p"; done | \
+	  sed -e 'h;s,^.*/,,;s/$(EXEEXT)$$//;$(transform)' \
+	      -e 's/$$/$(EXEEXT)/' \
+	`; \
+	test -n "$$list" || exit 0; \
+	echo " ( cd '$(DESTDIR)$(sbindir)' && rm -f" $$files ")"; \
+	cd "$(DESTDIR)$(sbindir)" && rm -f $$files
+
+clean-sbinPROGRAMS:
+	@list='$(sbin_PROGRAMS)'; test -n "$$list" || exit 0; \
+	echo " rm -f" $$list; \
+	rm -f $$list || exit $$?; \
+	test -n "$(EXEEXT)" || exit 0; \
+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+
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+	@rm -f nfsd$(EXEEXT)
+	$(AM_V_CCLD)$(LINK) $(nfsd_OBJECTS) $(nfsd_LDADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/nfsd.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/nfssvc.Po@am__quote@ # am--include-marker
+
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+	@$(MKDIR_P) $(@D)
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+
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+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+install-man8: $(man8_MANS)
+	@$(NORMAL_INSTALL)
+	@list1='$(man8_MANS)'; \
+	list2=''; \
+	test -n "$(man8dir)" \
+	  && test -n "`echo $$list1$$list2`" \
+	  || exit 0; \
+	echo " $(MKDIR_P) '$(DESTDIR)$(man8dir)'"; \
+	$(MKDIR_P) "$(DESTDIR)$(man8dir)" || exit 1; \
+	{ for i in $$list1; do echo "$$i"; done;  \
+	if test -n "$$list2"; then \
+	  for i in $$list2; do echo "$$i"; done \
+	    | sed -n '/\.8[a-z]*$$/p'; \
+	fi; \
+	} | while read p; do \
+	  if test -f $$p; then d=; else d="$(srcdir)/"; fi; \
+	  echo "$$d$$p"; echo "$$p"; \
+	done | \
+	sed -e 'n;s,.*/,,;p;h;s,.*\.,,;s,^[^8][0-9a-z]*$$,8,;x' \
+	      -e 's,\.[0-9a-z]*$$,,;$(transform);G;s,\n,.,' | \
+	sed 'N;N;s,\n, ,g' | { \
+	list=; while read file base inst; do \
+	  if test "$$base" = "$$inst"; then list="$$list $$file"; else \
+	    echo " $(INSTALL_DATA) '$$file' '$(DESTDIR)$(man8dir)/$$inst'"; \
+	    $(INSTALL_DATA) "$$file" "$(DESTDIR)$(man8dir)/$$inst" || exit $$?; \
+	  fi; \
+	done; \
+	for i in $$list; do echo "$$i"; done | $(am__base_list) | \
+	while read files; do \
+	  test -z "$$files" || { \
+	    echo " $(INSTALL_DATA) $$files '$(DESTDIR)$(man8dir)'"; \
+	    $(INSTALL_DATA) $$files "$(DESTDIR)$(man8dir)" || exit $$?; }; \
+	done; }
+
+uninstall-man8:
+	@$(NORMAL_UNINSTALL)
+	@list='$(man8_MANS)'; test -n "$(man8dir)" || exit 0; \
+	files=`{ for i in $$list; do echo "$$i"; done; \
+	} | sed -e 's,.*/,,;h;s,.*\.,,;s,^[^8][0-9a-z]*$$,8,;x' \
+	      -e 's,\.[0-9a-z]*$$,,;$(transform);G;s,\n,.,'`; \
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+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
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+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
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+
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+	list='$(am__tagged_files)'; \
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+	  [\\/]* | ?:[\\/]*) sdir="$(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)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(PROGRAMS) $(MANS) $(HEADERS)
+installdirs:
+	for dir in "$(DESTDIR)$(sbindir)" "$(DESTDIR)$(man8dir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
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+install-data: install-data-am
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+
+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-sbinPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/nfsd.Po
+	-rm -f ./$(DEPDIR)/nfssvc.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
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+info: info-am
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+install-data-am: install-man
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+
+install-exec-am: install-sbinPROGRAMS
+	@$(NORMAL_INSTALL)
+	$(MAKE) $(AM_MAKEFLAGS) install-exec-hook
+install-html: install-html-am
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+install-html-am:
+
+install-info: install-info-am
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+install-info-am:
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+install-pdf: install-pdf-am
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+
+install-ps: install-ps-am
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+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/nfsd.Po
+	-rm -f ./$(DEPDIR)/nfssvc.Po
+	-rm -f Makefile
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+	mostlyclean-libtool
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+
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+	@$(NORMAL_INSTALL)
+	$(MAKE) $(AM_MAKEFLAGS) uninstall-hook
+.MAKE: install-am install-exec-am install-strip uninstall-am
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-sbinPROGRAMS 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-exec-hook install-html install-html-am \
+	install-info install-info-am install-man install-man8 \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-sbinPROGRAMS 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 uninstall-hook \
+	uninstall-man uninstall-man8 uninstall-sbinPROGRAMS
+
+.PRECIOUS: Makefile
+
+
+#######################################################################
+# The following allows the current practice of having
+# daemons renamed during the install to include RPCPREFIX
+# and the KPREFIX
+# This could all be done much easier with program_transform_name
+# ( program_transform_name = s/^/$(RPCPREFIX)$(KPREFIX)/ )
+# but that also renames the man pages, which the current
+# practice does not do.
+install-exec-hook:
+	(cd $(DESTDIR)$(sbindir) && \
+	  for p in $(sbin_PROGRAMS); do \
+	    mv -f $$p$(EXEEXT) $(RPCPREFIX)$(KPREFIX)$$p$(EXEEXT) ;\
+	  done)
+uninstall-hook:
+	(cd $(DESTDIR)$(sbindir) && \
+	  for p in $(sbin_PROGRAMS); do \
+	    rm -f $(RPCPREFIX)$(KPREFIX)$$p$(EXEEXT) ;\
+	  done)
+
+# XXX This makes some assumptions about what automake does.
+# XXX But there is no install-man-hook or install-man-local.
+install-man: install-man8 install-man-links
+uninstall-man: uninstall-man8 uninstall-man-links
+
+install-man-links:
+	(cd $(DESTDIR)$(man8dir) && \
+	  for m in $(man8_MANS) $(dist_man8_MANS) $(nodist_man8_MANS); do \
+	    inst=`echo $$m | sed -e 's/man$$/8/'`; \
+	    rm -f $(RPCPREFIX)$$inst ; \
+	    $(LN_S) $$inst $(RPCPREFIX)$$inst ; \
+	  done)
+
+uninstall-man-links:
+	(cd $(DESTDIR)$(man8dir) && \
+	  for m in $(man8_MANS) $(dist_man8_MANS) $(nodist_man8_MANS); do \
+	    inst=`echo $$m | sed -e 's/man$$/8/'`; \
+	    rm -f $(RPCPREFIX)$$inst ; \
+	  done)
+
+# 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/nfsd/nfsd.c b/utils/nfsd/nfsd.c
new file mode 100644
index 0000000..249df00
--- /dev/null
+++ b/utils/nfsd/nfsd.c
@@ -0,0 +1,441 @@
+/*
+ * nfsd
+ *
+ * This is the user level part of nfsd. This is very primitive, because
+ * all the work is now done in the kernel module.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <getopt.h>
+#include <netdb.h>
+#include <libgen.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sched.h>
+
+#include "conffile.h"
+#include "nfslib.h"
+#include "nfssvc.h"
+#include "xlog.h"
+#include "xcommon.h"
+
+#ifndef NFSD_NPROC
+#define NFSD_NPROC 8
+#endif
+
+static void	usage(const char *);
+
+static struct option longopts[] =
+{
+	{ "host", 1, 0, 'H' },
+	{ "scope", 1, 0, 'S'},
+	{ "help", 0, 0, 'h' },
+	{ "no-nfs-version", 1, 0, 'N' },
+	{ "nfs-version", 1, 0, 'V' },
+	{ "tcp", 0, 0, 't' },
+	{ "no-tcp", 0, 0, 'T' },
+	{ "udp", 0, 0, 'u' },
+	{ "no-udp", 0, 0, 'U' },
+	{ "port", 1, 0, 'P' },
+	{ "port", 1, 0, 'p' },
+	{ "debug", 0, 0, 'd' },
+	{ "syslog", 0, 0, 's' },
+	{ "rdma", 2, 0, 'R' },
+	{ "grace-time", 1, 0, 'G'},
+	{ "lease-time", 1, 0, 'L'},
+	{ NULL, 0, 0, 0 }
+};
+
+inline static void 
+read_nfsd_conf(void)
+{
+	conf_init_file(NFS_CONFFILE); 
+	xlog_set_debug("nfsd");
+}
+
+int
+main(int argc, char **argv)
+{
+	int	count = NFSD_NPROC, c, i, error = 0, portnum, fd, found_one;
+	char *p, *progname, *port, *rdma_port = NULL;
+	char **haddr = NULL;
+	char *scope = NULL;
+	int hcounter = 0;
+	struct conf_list *hosts;
+	int	socket_up = 0;
+	unsigned int minorvers = NFSCTL_MINDEFAULT;
+	unsigned int minorversset = NFSCTL_MINDEFAULT;
+	unsigned int minormask = 0;
+	unsigned int versbits = NFSCTL_VERDEFAULT;
+	unsigned int protobits = NFSCTL_PROTODEFAULT;
+	int grace = -1;
+	int lease = -1;
+	int force4dot0 = 0;
+
+	progname = basename(argv[0]);
+	haddr = xmalloc(sizeof(char *));
+	haddr[0] = NULL;
+
+	xlog_syslog(0);
+	xlog_stderr(1);
+
+	/* Read in config setting */
+	read_nfsd_conf();
+
+	nfssvc_get_minormask(&minormask);
+
+	count = conf_get_num("nfsd", "threads", count);
+	grace = conf_get_num("nfsd", "grace-time", grace);
+	lease = conf_get_num("nfsd", "lease-time", lease);
+	port = conf_get_str("nfsd", "port");
+	if (!port)
+		port = "nfs";
+	if (conf_get_bool("nfsd", "rdma", false)) {
+		rdma_port = conf_get_str("nfsd", "rdma-port");
+		if (!rdma_port)
+			rdma_port = "nfsrdma";
+	}
+	/* backward compatibility - nfs.conf used to set rdma port directly */
+	if (!rdma_port)
+		rdma_port = conf_get_str("nfsd", "rdma");
+	if (conf_get_bool("nfsd", "udp", NFSCTL_UDPISSET(protobits)))
+		NFSCTL_UDPSET(protobits);
+	else
+		NFSCTL_UDPUNSET(protobits);
+	if (conf_get_bool("nfsd", "tcp", NFSCTL_TCPISSET(protobits)))
+		NFSCTL_TCPSET(protobits);
+	else
+		NFSCTL_TCPUNSET(protobits);
+	for (i = 2; i <= 4; i++) {
+		char tag[20];
+		sprintf(tag, "vers%d", i);
+		if (conf_get_bool("nfsd", tag, NFSCTL_VERISSET(versbits, i))) {
+			NFSCTL_VERSET(versbits, i);
+			if (i == 4)
+				minorvers = minorversset = minormask;
+		} else {
+			NFSCTL_VERUNSET(versbits, i);
+			if (i == 4) {
+				minorvers = 0;
+				minorversset = minormask;
+			}
+		}
+	}
+
+	/* We assume the kernel will default all minor versions to 'on',
+	 * and allow the config file to disable some.
+	 */
+	for (i = NFS4_MINMINOR; i <= NFS4_MAXMINOR; i++) {
+		char tag[20];
+		sprintf(tag, "vers4.%d", i);
+		/* The default for minor version support is to let the
+		 * kernel decide.  We could ask the kernel what that choice
+		 * will be, but that is needlessly complex.
+		 * Instead, perform a config-file lookup using each of the
+		 * two possible default.  If the result is different from the
+		 * default, then impose that value, else don't make a change
+		 * (i.e. don't set the bit in minorversset).
+		 */
+		if (!conf_get_bool("nfsd", tag, 1)) {
+			NFSCTL_MINORSET(minorversset, i);
+			NFSCTL_MINORUNSET(minorvers, i);
+			if (i == 0)
+				force4dot0 = 1;
+		}
+		if (conf_get_bool("nfsd", tag, 0)) {
+			NFSCTL_MINORSET(minorversset, i);
+			NFSCTL_MINORSET(minorvers, i);
+			if (i == 0)
+				force4dot0 = 1;
+		}
+	}
+
+	hosts = conf_get_list("nfsd", "host");
+	if (hosts && hosts->cnt) {
+		struct conf_list_node *n;
+		haddr = realloc(haddr, sizeof(char*) * hosts->cnt);
+		TAILQ_FOREACH(n, &(hosts->fields), link) {
+			haddr[hcounter] = n->field;
+			hcounter++;
+		}
+	}
+	scope = conf_get_str("nfsd", "scope");
+
+	while ((c = getopt_long(argc, argv, "dH:S:hN:V:p:P:stTuUrG:L:", longopts, NULL)) != EOF) {
+		switch(c) {
+		case 'd':
+			xlog_config(D_ALL, 1);
+			break;
+		case 'H':
+			if (hosts) {
+				hosts = NULL;
+				hcounter = 0;
+			}
+			if (hcounter) {
+				haddr = realloc(haddr, sizeof(char*) * hcounter+1);
+				if(!haddr) {
+					fprintf(stderr, "%s: unable to allocate "
+							"memory.\n", progname);
+					exit(1);
+				}
+			}
+			haddr[hcounter] = optarg;
+			hcounter++;
+			break;
+		case 'S':
+			scope = optarg;
+			break;
+		case 'P':	/* XXX for nfs-server compatibility */
+		case 'p':
+			/* only the last -p option has any effect */
+			port = optarg;
+			break;
+		case 'r':
+			rdma_port = "nfsrdma";
+			break;
+		case 'R': /* --rdma */
+			if (optarg)
+				rdma_port = optarg;
+			else
+				rdma_port = "nfsrdma";
+			break;
+
+		case 'N':
+			switch((c = strtol(optarg, &p, 0))) {
+			case 4:
+				if (*p == '.') {
+					int i = atoi(p+1);
+					if (i < 0 || i > NFS4_MAXMINOR) {
+						fprintf(stderr, "%s: unsupported minor version\n", optarg);
+						exit(1);
+					}
+					NFSCTL_MINORSET(minorversset, i);
+					NFSCTL_MINORUNSET(minorvers, i);
+					if (i == 0)
+						force4dot0 = 1;
+					if (minorvers != 0)
+						break;
+				} else {
+					minorvers = 0;
+					minorversset = minormask;
+				}
+				/* FALLTHRU */
+			case 3:
+				NFSCTL_VERUNSET(versbits, c);
+				break;
+			default:
+				fprintf(stderr, "%s: Unsupported version\n", optarg);
+				exit(1);
+			}
+			break;
+		case 'V':
+			switch((c = strtol(optarg, &p, 0))) {
+			case 4:
+				if (*p == '.') {
+					int i = atoi(p+1);
+					if (i < 0 || i > NFS4_MAXMINOR) {
+						fprintf(stderr, "%s: unsupported minor version\n", optarg);
+						exit(1);
+					}
+					NFSCTL_MINORSET(minorversset, i);
+					NFSCTL_MINORSET(minorvers, i);
+					if (i == 0)
+						force4dot0 = 1;
+				} else
+					minorvers = minorversset = minormask;
+				/* FALLTHRU */
+			case 3:
+				NFSCTL_VERSET(versbits, c);
+				break;
+			default:
+				fprintf(stderr, "%s: Unsupported version\n", optarg);
+				exit(1);
+			}
+			break;
+		case 's':
+			xlog_syslog(1);
+			xlog_stderr(0);
+			break;
+		case 't':
+			NFSCTL_TCPSET(protobits);
+			break;
+		case 'T':
+			NFSCTL_TCPUNSET(protobits);
+			break;
+		case 'u':
+			NFSCTL_UDPSET(protobits);
+			break;
+		case 'U':
+			NFSCTL_UDPUNSET(protobits);
+			break;
+		case 'G':
+			grace = strtol(optarg, &p, 0);
+			if (*p || grace <= 0) {
+				fprintf(stderr, "%s: Unrecognized grace time.\n", optarg);
+				exit(1);
+			}
+			break;
+		case 'L':
+			lease = strtol(optarg, &p, 0);
+			if (*p || lease <= 0) {
+				fprintf(stderr, "%s: Unrecognized lease time.\n", optarg);
+				exit(1);
+			}
+			break;
+		default:
+			fprintf(stderr, "Invalid argument: '%c'\n", c);
+			/* FALLTHRU */
+		case 'h':
+			usage(progname);
+		}
+	}
+
+	if (optind < argc) {
+		if ((count = atoi(argv[optind])) < 0) {
+			/* insane # of servers */
+			fprintf(stderr,
+				"%s: invalid server count (%d), using 1\n",
+				argv[0], count);
+			count = 1;
+		} else if (count == 0) {
+			/*
+			 * don't bother setting anything else if the threads
+			 * are coming down anyway.
+			 */
+			socket_up = 1;
+			goto set_threads;
+		}
+	}
+
+	xlog_open(progname);
+
+	portnum = strtol(port, &p, 0);
+	if (!*p && (portnum <= 0 || portnum > 65535)) {
+		/* getaddrinfo will catch other errors, but not
+		 * out-of-range numbers.
+		 */
+		xlog(L_ERROR, "invalid port number: %s", port);
+		exit(1);
+	}
+
+	/* make sure that at least one version is enabled */
+	found_one = 0;
+	for (c = NFSD_MINVERS; c <= NFSD_MAXVERS; c++) {
+		if (NFSCTL_VERISSET(versbits, c))
+			found_one = 1;
+	}
+	if (!found_one) {
+		xlog(L_ERROR, "no version specified");
+		exit(1);
+	}
+
+	if (NFSCTL_VERISSET(versbits, 4) &&
+	    !NFSCTL_TCPISSET(protobits)) {
+		xlog(L_ERROR, "version 4 requires the TCP protocol");
+		exit(1);
+	}
+
+	if (chdir(NFS_STATEDIR)) {
+		xlog(L_ERROR, "chdir(%s) failed: %m", NFS_STATEDIR);
+		exit(1);
+	}
+
+	/* make sure nfsdfs is mounted if it's available */
+	nfssvc_mount_nfsdfs(progname);
+
+	/* can only change number of threads if nfsd is already up */
+	if (nfssvc_inuse()) {
+		socket_up = 1;
+		goto set_threads;
+	}
+
+	/*
+	 * Must set versions before the fd's so that the right versions get
+	 * registered with rpcbind. Note that on older kernels w/o the right
+	 * interfaces, these are a no-op.
+	 * Timeouts must also be set before ports are created else we get
+	 * EBUSY.
+	 */
+	nfssvc_setvers(versbits, minorvers, minorversset, force4dot0);
+	if (grace > 0)
+		nfssvc_set_time("grace", grace);
+	if (lease  > 0)
+		nfssvc_set_time("lease", lease);
+
+	if (scope) {
+		if (unshare(CLONE_NEWUTS) < 0 ||
+		    sethostname(scope, strlen(scope)) < 0) {
+			xlog(L_ERROR, "Unable to set server scope: %m");
+			error = -1;
+			goto out;
+		}
+	}
+	i = 0;
+	do {
+		error = nfssvc_set_sockets(protobits, haddr[i], port);
+		if (!error)
+			socket_up = 1;
+	} while (++i < hcounter);
+
+	if (rdma_port) {
+		error = nfssvc_set_rdmaport(rdma_port);
+		if (!error)
+			socket_up = 1;
+	}
+set_threads:
+	/* don't start any threads if unable to hand off any sockets */
+	if (!socket_up) {
+		xlog(L_ERROR, "unable to set any sockets for nfsd");
+		goto out;
+	}
+	error = 0;
+
+	/*
+	 * KLUDGE ALERT:
+	 * Some kernels let nfsd kernel threads inherit open files
+	 * from the program that spawns them (i.e. us).  So close
+	 * everything before spawning kernel threads.  --Chip
+	 */
+	fd = open("/dev/null", O_RDWR);
+	if (fd == -1)
+		xlog(L_ERROR, "Unable to open /dev/null: %m");
+	else {
+		/* switch xlog output to syslog since stderr is being closed */
+		xlog_syslog(1);
+		xlog_stderr(0);
+		(void) dup2(fd, 0);
+		(void) dup2(fd, 1);
+		(void) dup2(fd, 2);
+	}
+	closeall(3);
+
+	if ((error = nfssvc_threads(count)) < 0)
+		xlog(L_ERROR, "error starting threads: errno %d (%m)", errno);
+out:
+	free(haddr);
+	return (error != 0);
+}
+
+static void
+usage(const char *prog)
+{
+	fprintf(stderr, "Usage:\n"
+		"%s [-d|--debug] [-H hostname] [-p|-P|--port port]\n"
+		"   [-N|--no-nfs-version version] [-V|--nfs-version version]\n"
+		"   [-s|--syslog] [-t|--tcp] [-T|--no-tcp] [-u|--udp] [-U|--no-udp]\n"
+		"   [-r|--rdma=] [-G|--grace-time secs] [-L|--leasetime secs] nrservs\n",
+		prog);
+	exit(2);
+}
diff --git a/utils/nfsd/nfsd.man b/utils/nfsd/nfsd.man
new file mode 100644
index 0000000..6f4fc1d
--- /dev/null
+++ b/utils/nfsd/nfsd.man
@@ -0,0 +1,203 @@
+.\"
+.\" nfsd(8)
+.\"
+.\" Copyright (C) 1999 Olaf Kirch <okir@monad.swb.de>
+.TH rpc.nfsd 8 "20 Feb 2014"
+.SH NAME
+rpc.nfsd \- NFS server process
+.SH SYNOPSIS
+.BI "/usr/sbin/rpc.nfsd [" options "]" " "nproc
+.SH DESCRIPTION
+The
+.B rpc.nfsd
+program implements the user level part of the NFS service. The
+main functionality is handled by the
+.B nfsd
+kernel module. The user space program merely specifies what sort of sockets
+the kernel service should listen on, what NFS versions it should support, and
+how many kernel threads it should use.
+.P
+The
+.B rpc.mountd
+server provides an ancillary service needed to satisfy mount requests
+by NFS clients.
+.SH OPTIONS
+.TP
+.B \-d " or " \-\-debug
+enable logging of debugging messages
+.TP
+.B \-H " or " \-\-host  hostname
+specify a particular hostname (or address) that NFS requests will
+be accepted on. By default,
+.B rpc.nfsd
+will accept NFS requests on all known network addresses.
+Note that
+.B lockd
+(which performs file locking services for NFS) may still accept
+request on all known network addresses.  This may change in future
+releases of the Linux Kernel. This option can be used multiple times
+to listen to more than one interface.
+.TP
+.B \-S " or " \-\-scope scope
+NFSv4.1 and later require the server to report a "scope" which is used
+by the clients to detect if two connections are to the same server.
+By default Linux NFSD uses the host name as the scope.
+.sp
+It is particularly important for high-availablity configurations to ensure
+that all potential server nodes report the same server scope.
+.TP
+.B \-p " or " \-\-port  port
+specify a different port to listen on for NFS requests. By default,
+.B rpc.nfsd
+will listen on port 2049.
+.TP
+.B \-r " or " \-\-rdma
+specify that NFS requests on the standard RDMA port ("nfsrdma", port
+20049) should be honored.
+.TP
+.BI \-\-rdma= port
+Listen for RDMA requests on an alternate port - may be a number or a
+name listed in
+.BR /etc/services .
+.TP
+.B \-N " or " \-\-no-nfs-version vers
+This option can be used to request that 
+.B rpc.nfsd
+does not offer certain versions of NFS. The current version of
+.B rpc.nfsd
+can support major NFS versions 3,4 and the minor versions 4.0, 4.1 and 4.2.
+.TP
+.B \-s " or " \-\-syslog
+By default,
+.B rpc.nfsd
+logs error messages (and debug messages, if enabled) to stderr. This option makes 
+.B rpc.nfsd
+log these messages to syslog instead. Note that errors encountered during
+option processing will still be logged to stderr regardless of this option.
+.TP
+.B \-t " or " \-\-tcp
+Instruct the kernel nfs server to open and listen on a TCP socket. This is the default.
+.TP
+.B \-T " or " \-\-no-tcp
+Instruct the kernel nfs server not to open and listen on a TCP socket.
+.TP
+.B \-u " or " \-\-udp
+Instruct the kernel nfs server to open and listen on a UDP socket.
+.TP
+.B \-U " or " \-\-no-udp
+Instruct the kernel nfs server not to open and listen on a UDP socket. This is the default.
+.TP
+.B \-V " or " \-\-nfs-version vers
+This option can be used to request that 
+.B rpc.nfsd
+offer certain versions of NFS. The current version of
+.B rpc.nfsd
+can support major NFS versions 3,4 and the minor versions 4.0, 4.1 and 4.2.
+.TP
+.B \-L " or " \-\-lease-time seconds
+Set the lease-time used for NFSv4.  This corresponds to how often
+clients need to confirm their state with the server. Valid range is
+from 10 to 3600 seconds.
+.TP
+.B \-G " or " \-\-grace-time seconds
+Set the grace-time used for NFSv4 and NLM (for NFSv2 and NFSv3).
+New file open requests (NFSv4) and new file locks (NLM) will not be
+allowed until after this time has passed to allow clients to recover state.
+.TP
+.I nproc
+specify the number of NFS server threads. By default, eight
+threads are started. However, for optimum performance several threads
+should be used. The actual figure depends on the number of and the work
+load created by the NFS clients, but a useful starting point is
+eight threads. Effects of modifying that number can be checked using
+the
+.BR nfsstat (8)
+program.
+.P
+Note that if the NFS server is already running, then the options for
+specifying host, port, and protocol will be ignored.  The number of
+processes given will be the only option considered, and the number of
+active
+.B nfsd
+processes will be increased or decreased to match this number.
+In particular
+.B rpc.nfsd 0
+will stop all threads and thus close any open connections.
+
+.SH CONFIGURATION FILE
+Many of the options that can be set on the command line can also be
+controlled through values set in the
+.B [nfsd]
+section of the
+.I /etc/nfs.conf
+configuration file.  Values recognized include:
+.TP
+.B threads
+The number of threads to start.
+.TP
+.B host
+A host name, or comma separated list of host names, that
+.I rpc.nfsd
+will listen on.  Use of the
+.B --host
+option replaces all host names listed here.
+.TP
+.B scope
+Set the server scope.
+.TP
+.B grace-time
+The grace time, for both NFSv4 and NLM, in seconds.
+.TP
+.B lease-time
+The lease time for NFSv4, in seconds.
+.TP
+.B port
+Set the port for TCP/UDP to bind to.
+.TP
+.B rdma
+Enable RDMA port (with "on" or "yes" etc) on the standard port
+("nfsrdma", port 20049).
+.TP
+.B rdma-port
+Set an alternate RDMA port.
+.TP
+.B UDP
+Enable (with "on" or "yes" etc) or disable ("off", "no") UDP support.
+.TP
+.B TCP
+Enable or disable TCP support.
+.TP
+.B vers3
+.TP
+.B vers4
+Enable or disable 
+.B all 
+NFSv4 versions.  All versions are normally enabled
+by default.
+.TP
+.B vers4.1
+.TP
+.B vers4.2
+Setting these to "off" or similar will disable the selected minor
+versions.  Setting to "on" will enable them.  The default values
+are determined by the kernel, and usually minor versions default to
+being enabled once the implementation is sufficiently complete.
+
+.SH NOTES
+If the program is built with TI-RPC support, it will enable any protocol and
+address family combinations that are marked visible in the
+.B netconfig
+database.
+
+.SH SEE ALSO
+.BR nfsd (7),
+.BR rpc.mountd (8),
+.BR exports (5),
+.BR exportfs (8),
+.BR nfs.conf (5),
+.BR rpc.rquotad (8),
+.BR nfsstat (8),
+.BR netconfig(5).
+.SH AUTHOR
+Olaf Kirch, Bill Hawes, H. J. Lu, G. Allan Morris III,
+and a host of others.
diff --git a/utils/nfsd/nfssvc.c b/utils/nfsd/nfssvc.c
new file mode 100644
index 0000000..46452d9
--- /dev/null
+++ b/utils/nfsd/nfssvc.c
@@ -0,0 +1,438 @@
+/*
+ * utils/nfsd/nfssvc.c
+ *
+ * Run an NFS daemon.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "nfslib.h"
+#include "xlog.h"
+#include "nfssvc.h"
+#include "version.h"
+
+#ifndef NFSD_FS_DIR
+#define NFSD_FS_DIR	  "/proc/fs/nfsd"
+#endif
+
+#define NFSD_PORTS_FILE   NFSD_FS_DIR "/portlist"
+#define NFSD_VERS_FILE    NFSD_FS_DIR "/versions"
+#define NFSD_THREAD_FILE  NFSD_FS_DIR "/threads"
+
+/*
+ * declaring a common static scratch buffer here keeps us from having to
+ * continually thrash the stack. The value of 128 bytes here is really just a
+ * SWAG and can be increased if necessary. It ought to be enough for the
+ * routines below however.
+ */
+char buf[128];
+
+/*
+ * Using the "new" interfaces for nfsd requires that /proc/fs/nfsd is
+ * actually mounted. Make an attempt to mount it here if it doesn't appear
+ * to be.
+ */
+void
+nfssvc_mount_nfsdfs(char *progname)
+{
+	int err;
+	struct stat statbuf;
+
+	err = stat(NFSD_THREAD_FILE, &statbuf);
+	if (err == 0)
+		return;
+
+	if (errno != ENOENT) {
+		xlog(L_ERROR, "Unable to stat %s: errno %d (%m)",
+				NFSD_THREAD_FILE, errno);
+		return;
+	}
+
+	/*
+	 * this call can return an error if modprobe is set up to automatically
+	 * mount nfsdfs when nfsd.ko is plugged in. So, ignore the return
+	 * code from it and just check for the "threads" file afterward.
+	 */
+	err = system("/bin/mount -t nfsd nfsd " NFSD_FS_DIR " >/dev/null 2>&1");
+
+	err = stat(NFSD_THREAD_FILE, &statbuf);
+	if (err == 0)
+		return;
+
+	xlog(L_WARNING, "Unable to access " NFSD_FS_DIR " errno %d (%m)." 
+		"\nPlease try, as root, 'mount -t nfsd nfsd " NFSD_FS_DIR 
+		"' and then restart %s to correct the problem", errno, progname);
+
+	return;
+}
+
+/*
+ * Are there already sockets configured? If not, then it is safe to try to
+ * open some and pass them through.
+ *
+ * Note: If the user explicitly asked for 'udp', then we should probably check
+ * if that is open, and should open it if not. However we don't yet. All
+ * sockets have to be opened when the first daemon is started.
+ */
+int
+nfssvc_inuse(void)
+{
+	int fd, n;
+
+	fd = open(NFSD_PORTS_FILE, O_RDONLY);
+
+	/* problem opening file, assume that nothing is configured */
+	if (fd < 0)
+		return 0;
+
+	n = read(fd, buf, sizeof(buf));
+	close(fd);
+
+	xlog(D_GENERAL, "knfsd is currently %s", (n > 0) ? "up" : "down");
+
+	return (n > 0);
+}
+
+static int
+nfssvc_setfds(const struct addrinfo *hints, const char *node, const char *port)
+{
+	int fd, on = 1, fac = L_ERROR;
+	int sockfd = -1, rc = 0, bounded = 0;
+	struct addrinfo *addrhead = NULL, *addr;
+	char *proto, *family;
+
+	/*
+	 * if file can't be opened, fail.
+	 */
+	fd = open(NFSD_PORTS_FILE, O_WRONLY);
+	if (fd < 0)
+		return 0;
+
+	rc = getaddrinfo(node, port, hints, &addrhead);
+	if (rc == EAI_NONAME && !strcmp(port, "nfs")) {
+		snprintf(buf, sizeof(buf), "%d", NFS_PORT);
+		rc = getaddrinfo(node, buf, hints, &addrhead);
+	}
+
+	if (rc != 0) {
+		xlog(L_ERROR, "unable to resolve %s:%s: %s",
+			node ? node : "ANYADDR", port,
+			rc == EAI_SYSTEM ? strerror(errno) :
+				gai_strerror(rc));
+		goto error;
+	}
+
+	addr = addrhead;
+	while(addr) {
+		/* skip non-TCP / non-UDP sockets */
+		switch(addr->ai_protocol) {
+		case IPPROTO_UDP:
+			proto = "UDP";
+			break;
+		case IPPROTO_TCP:
+			proto = "TCP";
+			break;
+		default:
+			addr = addr->ai_next;
+			continue;
+		}
+
+		switch(addr->ai_addr->sa_family) {
+		case AF_INET:
+			family = "AF_INET";
+			break;
+#ifdef IPV6_SUPPORTED
+		case AF_INET6:
+			family = "AF_INET6";
+			break;
+#endif /* IPV6_SUPPORTED */
+		default:
+			addr = addr->ai_next;
+			continue;
+		}
+
+		/* open socket and prepare to hand it off to kernel */
+		sockfd = socket(addr->ai_family, addr->ai_socktype,
+				addr->ai_protocol);
+		if (sockfd < 0) {
+			if (errno != EAFNOSUPPORT) {
+				xlog(L_ERROR, "unable to create %s %s socket: "
+				     "errno %d (%m)", family, proto, errno);
+				rc = errno;
+				goto error;
+			}
+			addr = addr->ai_next;
+			continue;
+		}
+
+		xlog(D_GENERAL, "Created %s %s socket.", family, proto);
+
+#ifdef IPV6_SUPPORTED
+		if (addr->ai_family == AF_INET6 &&
+		    setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on))) {
+			xlog(L_ERROR, "unable to set IPV6_V6ONLY: "
+				"errno %d (%m)\n", errno);
+			rc = errno;
+			goto error;
+		}
+#endif /* IPV6_SUPPORTED */
+		if (addr->ai_protocol == IPPROTO_TCP &&
+		    setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on))) {
+			xlog(L_ERROR, "unable to set SO_REUSEADDR on %s "
+				"socket: errno %d (%m)", family, errno);
+			rc = errno;
+			goto error;
+		}
+		if (bind(sockfd, addr->ai_addr, addr->ai_addrlen)) {
+			xlog(L_ERROR, "unable to bind %s %s socket: "
+				"errno %d (%m)", family, proto, errno);
+			rc = errno;
+			goto error;
+		}
+		if (addr->ai_protocol == IPPROTO_TCP && listen(sockfd, 64)) {
+			xlog(L_ERROR, "unable to create listening socket: "
+				"errno %d (%m)", errno);
+			rc = errno;
+			goto error;
+		}
+
+		if (fd < 0)
+			fd = open(NFSD_PORTS_FILE, O_WRONLY);
+
+		if (fd < 0) {
+			xlog(L_ERROR, "couldn't open ports file: errno "
+				      "%d (%m)", errno);
+			goto error;
+		}
+
+		snprintf(buf, sizeof(buf), "%d\n", sockfd); 
+		if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
+			/*
+			 * this error may be common on older kernels that don't
+			 * support IPv6, so turn into a debug message.
+			 */
+			if (errno == EAFNOSUPPORT)
+				fac = D_ALL;
+			xlog(fac, "writing fd to kernel failed: errno %d (%m)",
+				  errno);
+			rc = errno;
+			goto error;
+		}
+		bounded++;
+
+		close(fd);
+		close(sockfd);
+		sockfd = fd = -1;
+		addr = addr->ai_next;
+	}
+error:
+	if (fd >= 0)
+		close(fd);
+	if (sockfd >= 0)
+		close(sockfd);
+	nfs_freeaddrinfo(addrhead);
+	return (bounded ? 0 : rc);
+}
+
+int
+nfssvc_set_sockets(const unsigned int protobits,
+		   const char *host, const char *port)
+{
+	struct addrinfo hints = { .ai_flags = AI_PASSIVE };
+
+#ifdef IPV6_SUPPORTED
+	hints.ai_family = AF_UNSPEC;
+#else  /* IPV6_SUPPORTED */
+	hints.ai_family = AF_INET;
+#endif /* IPV6_SUPPORTED */
+
+	if (!NFSCTL_ANYPROTO(protobits))
+		return EPROTOTYPE;
+	else if (!NFSCTL_UDPISSET(protobits))
+		hints.ai_protocol = IPPROTO_TCP;
+	else if (!NFSCTL_TCPISSET(protobits))
+		hints.ai_protocol = IPPROTO_UDP;
+
+	return nfssvc_setfds(&hints, host, port);
+}
+
+int
+nfssvc_set_rdmaport(const char *port)
+{
+	struct servent *sv = getservbyname(port, "tcp");
+	int nport;
+	char buf[20];
+	int ret;
+	int fd;
+
+	if (sv)
+		nport = ntohs(sv->s_port);
+	else {
+		char *ep;
+		nport = strtol(port, &ep, 10);
+		if (!*port || *ep) {
+			xlog(L_ERROR, "unable to interpret port name %s",
+			     port);
+			return 1;
+		}
+	}
+
+	fd = open(NFSD_PORTS_FILE, O_WRONLY);
+	if (fd < 0)
+		return 1;
+	snprintf(buf, sizeof(buf), "rdma %d", nport);
+	ret = 0;
+	if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
+		ret= errno;
+		xlog(L_ERROR, "Unable to request RDMA services: %m");
+	}
+	close(fd);
+	return ret;
+}
+
+void
+nfssvc_set_time(const char *type, const int seconds)
+{
+	char pathbuf[40];
+	char nbuf[10];
+	int fd;
+
+	snprintf(pathbuf, sizeof(pathbuf), NFSD_FS_DIR "/nfsv4%stime", type);
+	snprintf(nbuf, sizeof(nbuf), "%d", seconds);
+	fd = open(pathbuf, O_WRONLY);
+	if (fd >= 0) {
+		if (write(fd, nbuf, strlen(nbuf)) != (ssize_t)strlen(nbuf))
+			xlog(L_ERROR, "Unable to set nfsv4%stime: %m", type);
+		close(fd);
+	}
+	if (strcmp(type, "grace") == 0) {
+		/* set same value for lockd */
+		fd = open("/proc/sys/fs/nfs/nlm_grace_period", O_WRONLY);
+		if (fd >= 0) {
+			if (write(fd, nbuf, strlen(nbuf)) != (ssize_t)strlen(nbuf))
+				xlog(L_ERROR, "Unable to write nlm_grace_period : %m");
+			close(fd);
+		}
+	}
+}
+
+void
+nfssvc_get_minormask(unsigned int *mask)
+{
+	int fd;
+	char *ptr = buf;
+	ssize_t size;
+
+	fd = open(NFSD_VERS_FILE, O_RDONLY);
+	if (fd < 0)
+		return;
+
+	size = read(fd, buf, sizeof(buf));
+	if (size < 0) {
+		xlog(L_ERROR, "Getting versions failed: errno %d (%m)", errno);
+		goto out;
+	}
+	ptr[size] = '\0';
+	for (;;) {
+		unsigned vers, minor = 0;
+		char *token = strtok(ptr, " ");
+
+		if (!token)
+			break;
+		ptr = NULL;
+		if (*token != '+' && *token != '-')
+			continue;
+		if (sscanf(++token, "%u.%u", &vers, &minor) > 0 &&
+		    vers == 4 && minor <= NFS4_MAXMINOR)
+			NFSCTL_MINORSET(*mask, minor);
+	}
+out:
+	close(fd);
+	return;
+}
+
+static int
+nfssvc_print_vers(char *ptr, unsigned size, unsigned vers, unsigned minorvers,
+		int isset, int force4dot0)
+{
+	char sign = isset ? '+' : '-';
+	if (minorvers == 0)
+		if (linux_version_code() < MAKE_VERSION(4, 11, 0) || !force4dot0)
+			return snprintf(ptr, size, "%c%u ", sign, vers);
+	return snprintf(ptr, size, "%c%u.%u ", sign, vers, minorvers);
+}
+
+void
+nfssvc_setvers(unsigned int ctlbits, unsigned int minorvers, unsigned int minorversset,
+	       int force4dot0)
+{
+	int fd, n, off;
+
+	off = 0;
+	fd = open(NFSD_VERS_FILE, O_WRONLY);
+	if (fd < 0)
+		return;
+
+	for (n = NFSD_MINVERS; n <= ((NFSD_MAXVERS < 3) ? NFSD_MAXVERS : 3); n++)
+		off += nfssvc_print_vers(&buf[off], sizeof(buf) - off,
+				n, 0, NFSCTL_VERISSET(ctlbits, n), 0);
+
+	for (n = 0; n <= NFS4_MAXMINOR; n++) {
+		if (!NFSCTL_MINORISSET(minorversset, n))
+			continue;
+		off += nfssvc_print_vers(&buf[off], sizeof(buf) - off,
+				4, n, NFSCTL_MINORISSET(minorvers, n),
+				(n == 0) ? force4dot0 : 0);
+	}
+	if (!off--)
+		goto out;
+	buf[off] = '\0';
+	xlog(D_GENERAL, "Writing version string to kernel: %s", buf);
+	snprintf(&buf[off], sizeof(buf) - off, "\n");
+	if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
+		xlog(L_ERROR, "Setting version failed: errno %d (%m)", errno);
+out:
+	close(fd);
+
+	return;
+}
+
+int
+nfssvc_threads(const int nrservs)
+{
+	ssize_t n;
+	int fd;
+
+	fd = open(NFSD_THREAD_FILE, O_WRONLY);
+	if (fd < 0)
+		fd = open("/proc/fs/nfs/threads", O_WRONLY);
+	if (fd >= 0) {
+		/* 2.5+ kernel with nfsd filesystem mounted.
+		 * Just write the number of threads.
+		 */
+		snprintf(buf, sizeof(buf), "%d\n", nrservs);
+		n = write(fd, buf, strlen(buf));
+		close(fd);
+		if (n != (ssize_t)strlen(buf))
+			return -1;
+		else
+			return 0;
+	}
+	return -1;
+}
diff --git a/utils/nfsd/nfssvc.h b/utils/nfsd/nfssvc.h
new file mode 100644
index 0000000..4d53af1
--- /dev/null
+++ b/utils/nfsd/nfssvc.h
@@ -0,0 +1,32 @@
+/*
+ *   utils/nfsd/nfssvc.h -- nfs service control routines for rpc.nfsd
+ *
+ *   Copyright (C) 2009 Red Hat, Inc <nfs@redhat.com>.
+ *   Copyright (C) 2009 Jeff Layton <jlayton@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 0211-1301 USA
+ *
+ */
+
+void	nfssvc_mount_nfsdfs(char *progname);
+int	nfssvc_inuse(void);
+int	nfssvc_set_sockets(const unsigned int protobits,
+			   const char *host, const char *port);
+void	nfssvc_set_time(const char *type, const int seconds);
+int	nfssvc_set_rdmaport(const char *port);
+void	nfssvc_setvers(unsigned int ctlbits, unsigned int minorvers4,
+		       unsigned int minorvers4set, int force4dot0);
+int	nfssvc_threads(int nrservs);
+void	nfssvc_get_minormask(unsigned int *mask);
diff --git a/utils/nfsdcld/Makefile.am b/utils/nfsdcld/Makefile.am
new file mode 100644
index 0000000..273d64f
--- /dev/null
+++ b/utils/nfsdcld/Makefile.am
@@ -0,0 +1,15 @@
+## Process this file with automake to produce Makefile.in
+
+man8_MANS	= nfsdcld.man
+EXTRA_DIST	= $(man8_MANS)
+
+AM_CFLAGS	+= -D_LARGEFILE64_SOURCE
+sbin_PROGRAMS	= nfsdcld
+
+nfsdcld_SOURCES = nfsdcld.c sqlite.c legacy.c
+nfsdcld_LDADD = ../../support/nfs/libnfs.la $(LIBEVENT) $(LIBSQLITE) $(LIBCAP)
+
+noinst_HEADERS	= sqlite.h cld-internal.h legacy.h
+
+MAINTAINERCLEANFILES = Makefile.in
+
diff --git a/utils/nfsdcld/Makefile.in b/utils/nfsdcld/Makefile.in
new file mode 100644
index 0000000..5ada9cf
--- /dev/null
+++ b/utils/nfsdcld/Makefile.in
@@ -0,0 +1,822 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
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+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
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+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
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+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
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+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+install_sh_DATA = $(install_sh) -c -m 644
+install_sh_PROGRAM = $(install_sh) -c
+install_sh_SCRIPT = $(install_sh) -c
+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+build_triplet = @build@
+host_triplet = @host@
+sbin_PROGRAMS = nfsdcld$(EXEEXT)
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+ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
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+	$(top_srcdir)/aclocal/ipv6.m4 \
+	$(top_srcdir)/aclocal/kerberos5.m4 \
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+	$(top_srcdir)/aclocal/libblkid.m4 \
+	$(top_srcdir)/aclocal/libcap.m4 \
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+	$(top_srcdir)/aclocal/libsqlite3.m4 \
+	$(top_srcdir)/aclocal/libtirpc.m4 \
+	$(top_srcdir)/aclocal/libxml2.m4 \
+	$(top_srcdir)/aclocal/nfs-utils.m4 \
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+	$(am__DIST_COMMON)
+mkinstalldirs = $(install_sh) -d
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+am__installdirs = "$(DESTDIR)$(sbindir)" "$(DESTDIR)$(man8dir)"
+PROGRAMS = $(sbin_PROGRAMS)
+am_nfsdcld_OBJECTS = nfsdcld.$(OBJEXT) sqlite.$(OBJEXT) \
+	legacy.$(OBJEXT)
+nfsdcld_OBJECTS = $(am_nfsdcld_OBJECTS)
+am__DEPENDENCIES_1 =
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+	$(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1) \
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+	./$(DEPDIR)/sqlite.Po
+am__mv = mv -f
+COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
+	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
+LTCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) \
+	$(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
+	$(AM_CFLAGS) $(CFLAGS)
+AM_V_CC = $(am__v_CC_@AM_V@)
+am__v_CC_ = $(am__v_CC_@AM_DEFAULT_V@)
+am__v_CC_0 = @echo "  CC      " $@;
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+CCLD = $(CC)
+LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
+	$(AM_LDFLAGS) $(LDFLAGS) -o $@
+AM_V_CCLD = $(am__v_CCLD_@AM_V@)
+am__v_CCLD_ = $(am__v_CCLD_@AM_DEFAULT_V@)
+am__v_CCLD_0 = @echo "  CCLD    " $@;
+am__v_CCLD_1 = 
+SOURCES = $(nfsdcld_SOURCES)
+DIST_SOURCES = $(nfsdcld_SOURCES)
+am__can_run_installinfo = \
+  case $$AM_UPDATE_INFO_DIR in \
+    n|no|NO) false;; \
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+  esac
+am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`;
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+  $(AWK) 'BEGIN { files["."] = "" } { files[$$2] = files[$$2] " " $$1; \
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+install-data-am: install-man
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am: install-sbinPROGRAMS
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man: install-man8
+
+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 ./$(DEPDIR)/legacy.Po
+	-rm -f ./$(DEPDIR)/nfsdcld.Po
+	-rm -f ./$(DEPDIR)/sqlite.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: uninstall-man uninstall-sbinPROGRAMS
+
+uninstall-man: uninstall-man8
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-sbinPROGRAMS 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-man8 install-pdf \
+	install-pdf-am install-ps install-ps-am install-sbinPROGRAMS \
+	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 \
+	uninstall-man uninstall-man8 uninstall-sbinPROGRAMS
+
+.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/utils/nfsdcld/cld-internal.h b/utils/nfsdcld/cld-internal.h
new file mode 100644
index 0000000..3576515
--- /dev/null
+++ b/utils/nfsdcld/cld-internal.h
@@ -0,0 +1,44 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef _CLD_INTERNAL_H_
+#define _CLD_INTERNAL_H_
+
+#if CLD_UPCALL_VERSION >= 2
+#define UPCALL_VERSION		2
+#else
+#define UPCALL_VERSION		1
+#endif
+
+struct cld_client {
+	int			cl_fd;
+	struct event		*cl_event;
+	union {
+		struct cld_msg		cl_msg;
+#if UPCALL_VERSION >= 2
+		struct cld_msg_v2	cl_msg_v2;
+#endif
+	} cl_u;
+};
+
+extern uint64_t current_epoch;
+extern uint64_t recovery_epoch;
+extern int first_time;
+extern int num_cltrack_records;
+extern int num_legacy_records;
+
+#endif /* _CLD_INTERNAL_H_ */
diff --git a/utils/nfsdcld/legacy.c b/utils/nfsdcld/legacy.c
new file mode 100644
index 0000000..b89374c
--- /dev/null
+++ b/utils/nfsdcld/legacy.c
@@ -0,0 +1,171 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <dirent.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <limits.h>
+#include "cld.h"
+#include "sqlite.h"
+#include "xlog.h"
+#include "legacy.h"
+
+#define NFSD_RECDIR_FILE "/proc/fs/nfsd/nfsv4recoverydir"
+
+/*
+ * Loads client records from the v4recovery directory into the database.
+ * Records are prefixed with the string "hash:" and include the '\0' byte.
+ *
+ * Called during database initialization as part of a one-time "upgrade".
+ */
+void
+legacy_load_clients_from_recdir(int *num_records)
+{
+	int fd;
+	DIR *v4recovery;
+	struct dirent *entry;
+	char recdirname[PATH_MAX+1];
+	char buf[NFS4_OPAQUE_LIMIT];
+	char *nl;
+	ssize_t n;
+
+	fd = open(NFSD_RECDIR_FILE, O_RDONLY);
+	if (fd < 0) {
+		xlog(D_GENERAL, "Unable to open %s: %m", NFSD_RECDIR_FILE);
+		return;
+	}
+	n = read(fd, recdirname, PATH_MAX);
+	close(fd);
+	if (n < 0) {
+		xlog(D_GENERAL, "Unable to read from %s: %m", NFSD_RECDIR_FILE);
+		return;
+	}
+	/* the output from the proc file isn't null-terminated */
+	recdirname[PATH_MAX] = '\0';
+	nl = strchr(recdirname, '\n');
+	if (!nl)
+		return;
+	*nl = '\0';
+	v4recovery = opendir(recdirname);
+	if (!v4recovery)
+		return;
+	while ((entry = readdir(v4recovery))) {
+		int ret;
+
+		/* skip "." and ".." */
+		if (entry->d_name[0] == '.') {
+			switch (entry->d_name[1]) {
+			case '\0':
+				continue;
+			case '.':
+				if (entry->d_name[2] == '\0')
+					continue;
+			}
+		}
+		/* prefix legacy records with the string "hash:" */
+		ret = snprintf(buf, sizeof(buf), "hash:%s", entry->d_name);
+		/* if there's a problem, then skip this entry */
+		if (ret < 0 || (size_t)ret >= sizeof(buf)) {
+			xlog(L_WARNING, "%s: unable to build client string for %s!",
+				__func__, entry->d_name);
+			continue;
+		}
+		/* legacy client records need to include the null terminator */
+		ret = sqlite_insert_client((unsigned char *)buf, strlen(buf) + 1);
+		if (ret)
+			xlog(L_WARNING, "%s: unable to insert %s: %d", __func__,
+				entry->d_name, ret);
+		else
+			(*num_records)++;
+	}
+	closedir(v4recovery);
+}
+
+/*
+ * Cleans out the v4recovery directory.
+ *
+ * Called upon receipt of the first "GraceDone" upcall only.
+ */
+void
+legacy_clear_recdir(void)
+{
+	int fd;
+	DIR *v4recovery;
+	struct dirent *entry;
+	char recdirname[PATH_MAX+1];
+	char dirname[PATH_MAX];
+	char *nl;
+	ssize_t n;
+
+	fd = open(NFSD_RECDIR_FILE, O_RDONLY);
+	if (fd < 0) {
+		xlog(D_GENERAL, "Unable to open %s: %m", NFSD_RECDIR_FILE);
+		return;
+	}
+	n = read(fd, recdirname, PATH_MAX);
+	close(fd);
+	if (n < 0) {
+		xlog(D_GENERAL, "Unable to read from %s: %m", NFSD_RECDIR_FILE);
+		return;
+	}
+	/* the output from the proc file isn't null-terminated */
+	recdirname[PATH_MAX] = '\0';
+	nl = strchr(recdirname, '\n');
+	if (!nl)
+		return;
+	*nl = '\0';
+	v4recovery = opendir(recdirname);
+	if (!v4recovery)
+		return;
+	while ((entry = readdir(v4recovery))) {
+		int len;
+
+		/* skip "." and ".." */
+		if (entry->d_name[0] == '.') {
+			switch (entry->d_name[1]) {
+			case '\0':
+				continue;
+			case '.':
+				if (entry->d_name[2] == '\0')
+					continue;
+			}
+		}
+		len = snprintf(dirname, sizeof(dirname), "%s/%s", recdirname,
+				entry->d_name);
+		/* if there's a problem, then skip this entry */
+		if (len < 0 || (size_t)len >= sizeof(dirname)) {
+			xlog(L_WARNING, "%s: unable to build filename for %s!",
+				__func__, entry->d_name);
+			continue;
+		}
+		len = rmdir(dirname);
+		if (len)
+			xlog(L_WARNING, "%s: unable to rmdir %s: %d", __func__,
+				dirname, len);
+	}
+	closedir(v4recovery);
+}
diff --git a/utils/nfsdcld/legacy.h b/utils/nfsdcld/legacy.h
new file mode 100644
index 0000000..8988f6e
--- /dev/null
+++ b/utils/nfsdcld/legacy.h
@@ -0,0 +1,24 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef _LEGACY_H_
+#define _LEGACY_H_
+
+void legacy_load_clients_from_recdir(int *);
+void legacy_clear_recdir(void);
+
+#endif /* _LEGACY_H_ */
diff --git a/utils/nfsdcld/nfsdcld.c b/utils/nfsdcld/nfsdcld.c
new file mode 100644
index 0000000..dbc7a57
--- /dev/null
+++ b/utils/nfsdcld/nfsdcld.c
@@ -0,0 +1,922 @@
+/*
+ * nfsdcld.c -- NFSv4 client name tracking daemon
+ *
+ * Copyright (C) 2011  Red Hat, Jeff Layton <jlayton@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <errno.h>
+#include <event2/event.h>
+#include <stdbool.h>
+#include <getopt.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <libgen.h>
+#include <sys/inotify.h>
+#ifdef HAVE_SYS_CAPABILITY_H
+#include <sys/prctl.h>
+#include <sys/capability.h>
+#endif
+
+#include "xlog.h"
+#include "nfslib.h"
+#include "cld.h"
+#include "cld-internal.h"
+#include "sqlite.h"
+#include "version.h"
+#include "conffile.h"
+#include "legacy.h"
+
+#ifndef DEFAULT_PIPEFS_DIR
+#define DEFAULT_PIPEFS_DIR NFS_STATEDIR "/rpc_pipefs"
+#endif
+
+#define DEFAULT_CLD_PATH	"/nfsd/cld"
+
+#ifndef CLD_DEFAULT_STORAGEDIR
+#define CLD_DEFAULT_STORAGEDIR NFS_STATEDIR "/nfsdcld"
+#endif
+
+#define NFSD_END_GRACE_FILE "/proc/fs/nfsd/v4_end_grace"
+
+/* private data structures */
+
+/* global variables */
+static char pipefs_dir[PATH_MAX] = DEFAULT_PIPEFS_DIR;
+static char pipepath[PATH_MAX];
+static int 		inotify_fd = -1;
+static struct event	 *pipedir_event;
+static struct event_base *evbase;
+static bool old_kernel = false;
+static bool signal_received = false;
+
+uint64_t current_epoch;
+uint64_t recovery_epoch;
+int first_time;
+int num_cltrack_records;
+int num_legacy_records;
+
+static struct option longopts[] =
+{
+	{ "help", 0, NULL, 'h' },
+	{ "foreground", 0, NULL, 'F' },
+	{ "debug", 0, NULL, 'd' },
+	{ "pipefsdir", 1, NULL, 'p' },
+	{ "storagedir", 1, NULL, 's' },
+	{ NULL, 0, 0, 0 },
+};
+
+/* forward declarations */
+static void cldcb(int UNUSED(fd), short which, void *data);
+
+static void
+sig_die(int signal)
+{
+	if (signal_received) {
+		xlog(D_GENERAL, "forced exiting on signal %d\n", signal);
+		exit(0);
+	}
+
+	signal_received = true;
+	xlog(D_GENERAL, "exiting on signal %d\n", signal);
+	event_base_loopexit(evbase, NULL);
+}
+
+static void
+usage(char *progname)
+{
+	printf("%s [ -hFd ] [ -p pipefsdir ] [ -s storagedir ]\n", progname);
+}
+
+static int
+cld_set_caps(void)
+{
+	int ret = 0;
+#ifdef HAVE_SYS_CAPABILITY_H
+	unsigned long i;
+	cap_t caps;
+
+	if (getuid() != 0) {
+		xlog(L_ERROR, "Not running as root. Daemon won't be able to "
+			      "open the pipe after dropping capabilities!");
+		return -EINVAL;
+	}
+
+	/* prune the bounding set to nothing */
+	for (i = 0; prctl(PR_CAPBSET_READ, i, 0, 0, 0) >= 0 ; ++i) {
+		ret = prctl(PR_CAPBSET_DROP, i, 0, 0, 0);
+		if (ret) {
+			xlog(L_ERROR, "Unable to prune capability %lu from "
+				      "bounding set: %m", i);
+			return -errno;
+		}
+	}
+
+	/* get a blank capset */
+	caps = cap_init();
+	if (caps == NULL) {
+		xlog(L_ERROR, "Unable to get blank capability set: %m");
+		return -errno;
+	}
+
+	/* reset the process capabilities */
+	if (cap_set_proc(caps) != 0) {
+		xlog(L_ERROR, "Unable to set process capabilities: %m");
+		ret = -errno;
+	}
+	cap_free(caps);
+#endif
+	return ret;
+}
+
+#define INOTIFY_EVENT_MAX (sizeof(struct inotify_event) + NAME_MAX)
+
+static int
+cld_pipe_open(struct cld_client *clnt)
+{
+	int fd;
+	struct event *ev;
+
+	xlog(D_GENERAL, "%s: opening upcall pipe %s", __func__, pipepath);
+	fd = open(pipepath, O_RDWR, 0);
+	if (fd < 0) {
+		xlog(D_GENERAL, "%s: open of %s failed: %m", __func__, pipepath);
+		return -errno;
+	}
+
+	ev = event_new(evbase, fd, EV_READ, cldcb, clnt);
+	if (ev == NULL) {
+		xlog(D_GENERAL, "%s: failed to create event for %s", __func__, pipepath);
+		close(fd);
+		return -ENOMEM;
+	}
+
+	if (clnt->cl_event && event_initialized(clnt->cl_event)) {
+		event_del(clnt->cl_event);
+		event_free(clnt->cl_event);
+	}
+	if (clnt->cl_fd >= 0)
+		close(clnt->cl_fd);
+
+	clnt->cl_fd = fd;
+	clnt->cl_event = ev;
+	/* event_add is done by the caller */
+	return 0;
+}
+
+static void
+cld_inotify_cb(int UNUSED(fd), short which, void *data)
+{
+	int ret;
+	size_t elen;
+	ssize_t rret;
+	char evbuf[INOTIFY_EVENT_MAX];
+	char *dirc = NULL, *pname;
+	struct inotify_event *event = (struct inotify_event *)evbuf;
+	struct cld_client *clnt = data;
+
+	if (which != EV_READ)
+		return;
+
+	xlog(D_GENERAL, "%s: called for EV_READ", __func__);
+
+	dirc = strndup(pipepath, PATH_MAX);
+	if (!dirc) {
+		xlog(L_ERROR, "%s: unable to allocate memory", __func__);
+		goto out;
+	}
+
+	rret = read(inotify_fd, evbuf, INOTIFY_EVENT_MAX);
+	if (rret < 0) {
+		xlog(L_ERROR, "%s: read from inotify fd failed: %m", __func__);
+		goto out;
+	}
+
+	/* check to see if we have a filename in the evbuf */
+	if (!event->len) {
+		xlog(D_GENERAL, "%s: no filename in inotify event", __func__);
+		goto out;
+	}
+
+	pname = basename(dirc);
+	elen = strnlen(event->name, event->len);
+
+	/* does the filename match our pipe? */
+	if (strlen(pname) != elen || memcmp(pname, event->name, elen)) {
+		xlog(D_GENERAL, "%s: wrong filename (%s)", __func__,
+				event->name);
+		goto out;
+	}
+
+	ret = cld_pipe_open(clnt);
+	switch (ret) {
+	case 0:
+		/* readd the event for the cl_event pipe */
+		event_add(clnt->cl_event, NULL);
+		break;
+	case -ENOENT:
+		/* pipe must have disappeared, wait for it to come back */
+		goto out;
+	default:
+		/* anything else is fatal */
+		xlog(L_FATAL, "%s: unable to open new pipe (%d). Aborting.",
+			__func__, ret);
+		exit(ret);
+	}
+
+out:
+	event_add(pipedir_event, NULL);
+	free(dirc);
+}
+
+static int
+cld_inotify_setup(void)
+{
+	int ret;
+	char *dirc, *dname;
+
+	dirc = strndup(pipepath, PATH_MAX);
+	if (!dirc) {
+		xlog_err("%s: unable to allocate memory", __func__);
+		ret = -ENOMEM;
+		goto out_free;
+	}
+
+	dname = dirname(dirc);
+
+	inotify_fd = inotify_init();
+	if (inotify_fd < 0) {
+		xlog_err("%s: inotify_init failed: %m", __func__);
+		ret = -errno;
+		goto out_free;
+	}
+
+	ret = inotify_add_watch(inotify_fd, dname, IN_CREATE);
+	if (ret < 0) {
+		xlog_err("%s: inotify_add_watch failed: %m", __func__);
+		ret = -errno;
+		goto out_err;
+	} else
+		ret = 0;
+
+out_free:
+	free(dirc);
+	return ret;
+out_err:
+	close(inotify_fd);
+	goto out_free;
+}
+
+/*
+ * Set an inotify watch on the directory that should contain the pipe, and then
+ * try to open it. If it fails with anything but -ENOENT, return the error
+ * immediately.
+ *
+ * If it succeeds, then set up the pipe event handler. At that point, set up
+ * the inotify event handler and go ahead and return success.
+ */
+static int
+cld_pipe_init(struct cld_client *clnt)
+{
+	int ret;
+
+	xlog(D_GENERAL, "%s: init pipe handlers", __func__);
+
+	ret = cld_inotify_setup();
+	if (ret != 0)
+		goto out;
+
+	clnt->cl_fd = -1;
+	ret = cld_pipe_open(clnt);
+	switch (ret) {
+	case 0:
+		/* add the event and we're good to go */
+		event_add(clnt->cl_event, NULL);
+		break;
+	case -ENOENT:
+		/* ignore this error -- cld_inotify_cb will handle it */
+		ret = 0;
+		break;
+	default:
+		/* anything else is fatal */
+		close(inotify_fd);
+		goto out;
+	}
+
+	/* set event for inotify read */
+	pipedir_event = event_new(evbase, inotify_fd, EV_READ, cld_inotify_cb, clnt);
+	if (pipedir_event == NULL) {
+		close(inotify_fd);
+		return -ENOMEM;
+	}
+	event_add(pipedir_event, NULL);
+out:
+	return ret;
+}
+
+/*
+ * Older kernels will not tell nfsdcld when a grace period has started.
+ * Therefore we have to peek at the /proc/fs/nfsd/v4_end_grace file to
+ * see if nfsd is in grace.  We have to do this for create and remove
+ * upcalls to ensure that the correct table is being updated - otherwise
+ * we could lose client records when the grace period is lifted.
+ */
+static int
+cld_check_grace_period(void)
+{
+	int fd, ret = 0;
+	char c;
+
+	if (!old_kernel)
+		return 0;
+	if (recovery_epoch != 0)
+		return 0;
+	fd = open(NFSD_END_GRACE_FILE, O_RDONLY);
+	if (fd < 0) {
+		xlog(L_WARNING, "Unable to open %s: %m",
+			NFSD_END_GRACE_FILE);
+		return 1;
+	}
+	if (read(fd, &c, 1) < 0) {
+		xlog(L_WARNING, "Unable to read from %s: %m",
+			NFSD_END_GRACE_FILE);
+		close(fd);
+		return 1;
+	}
+	close(fd);
+	if (c == 'N') {
+		xlog(L_WARNING, "nfsd is in grace but didn't send a gracestart upcall, "
+			"please update the kernel");
+		ret = sqlite_grace_start();
+	}
+	return ret;
+}
+
+#if UPCALL_VERSION >= 2
+static ssize_t cld_message_size(void *msg)
+{
+	struct cld_msg_hdr *hdr = (struct cld_msg_hdr *)msg;
+
+	switch (hdr->cm_vers) {
+	case 1:
+		return sizeof(struct cld_msg);
+	case 2:
+		return sizeof(struct cld_msg_v2);
+	default:
+		xlog(L_FATAL, "%s invalid upcall version %d", __func__,
+		     hdr->cm_vers);
+		exit(-EINVAL);
+	}
+}
+#else
+static ssize_t cld_message_size(void *UNUSED(msg))
+{
+	return sizeof(struct cld_msg);
+}
+#endif
+
+static void
+cld_not_implemented(struct cld_client *clnt)
+{
+	int ret;
+	ssize_t bsize, wsize;
+#if UPCALL_VERSION >= 2
+	struct cld_msg_v2 *cmsg = &clnt->cl_u.cl_msg_v2;
+#else
+	struct cld_msg *cmsg = &clnt->cl_u.cl_msg;
+#endif
+
+	xlog(D_GENERAL, "%s: downcalling with not implemented error", __func__);
+
+	/* set up reply */
+	cmsg->cm_status = -EOPNOTSUPP;
+
+	bsize = cld_message_size(cmsg);
+	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
+	if (wsize != bsize)
+		xlog(L_ERROR, "%s: problem writing to cld pipe (%zd): %m",
+			 __func__, wsize);
+
+	/* reopen pipe, just to be sure */
+	ret = cld_pipe_open(clnt);
+	if (ret) {
+		xlog(L_FATAL, "%s: unable to reopen pipe: %d", __func__, ret);
+		exit(ret);
+	}
+}
+
+static void
+cld_get_version(struct cld_client *clnt)
+{
+	int ret;
+	ssize_t bsize, wsize;
+#if UPCALL_VERSION >= 2
+	struct cld_msg_v2 *cmsg = &clnt->cl_u.cl_msg_v2;
+#else
+	struct cld_msg *cmsg = &clnt->cl_u.cl_msg;
+#endif
+
+	xlog(D_GENERAL, "%s: version = %u.", __func__, UPCALL_VERSION);
+
+	cmsg->cm_u.cm_version = UPCALL_VERSION;
+	cmsg->cm_status = 0;
+
+	bsize = cld_message_size(cmsg);
+	xlog(D_GENERAL, "Doing downcall with status %d", cmsg->cm_status);
+	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
+	if (wsize != bsize) {
+		xlog(L_ERROR, "%s: problem writing to cld pipe (%zd): %m",
+			 __func__, wsize);
+		ret = cld_pipe_open(clnt);
+		if (ret) {
+			xlog(L_FATAL, "%s: unable to reopen pipe: %d",
+					__func__, ret);
+			exit(ret);
+		}
+	}
+}
+
+static void
+cld_create(struct cld_client *clnt)
+{
+	int ret;
+	ssize_t bsize, wsize;
+#if UPCALL_VERSION >= 2
+	struct cld_msg_v2 *cmsg = &clnt->cl_u.cl_msg_v2;
+#else
+	struct cld_msg *cmsg = &clnt->cl_u.cl_msg;
+#endif
+
+	ret = cld_check_grace_period();
+	if (ret)
+		goto reply;
+
+	xlog(D_GENERAL, "%s: create client record.", __func__);
+
+#if UPCALL_VERSION >= 2
+	if (cmsg->cm_vers >= 2)
+		ret = sqlite_insert_client_and_princhash(
+					cmsg->cm_u.cm_clntinfo.cc_name.cn_id,
+					cmsg->cm_u.cm_clntinfo.cc_name.cn_len,
+					cmsg->cm_u.cm_clntinfo.cc_princhash.cp_data,
+					cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len);
+	else
+		ret = sqlite_insert_client(cmsg->cm_u.cm_name.cn_id,
+					   cmsg->cm_u.cm_name.cn_len);
+#else
+	ret = sqlite_insert_client(cmsg->cm_u.cm_name.cn_id,
+				   cmsg->cm_u.cm_name.cn_len);
+#endif
+
+reply:
+	cmsg->cm_status = ret ? -EREMOTEIO : ret;
+
+	bsize = cld_message_size(cmsg);
+	xlog(D_GENERAL, "Doing downcall with status %d", cmsg->cm_status);
+	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
+	if (wsize != bsize) {
+		xlog(L_ERROR, "%s: problem writing to cld pipe (%zd): %m",
+			 __func__, wsize);
+		ret = cld_pipe_open(clnt);
+		if (ret) {
+			xlog(L_FATAL, "%s: unable to reopen pipe: %d",
+					__func__, ret);
+			exit(ret);
+		}
+	}
+}
+
+static void
+cld_remove(struct cld_client *clnt)
+{
+	int ret;
+	ssize_t bsize, wsize;
+#if UPCALL_VERSION >= 2
+	struct cld_msg_v2 *cmsg = &clnt->cl_u.cl_msg_v2;
+#else
+	struct cld_msg *cmsg = &clnt->cl_u.cl_msg;
+#endif
+
+	ret = cld_check_grace_period();
+	if (ret)
+		goto reply;
+
+	xlog(D_GENERAL, "%s: remove client record.", __func__);
+
+	ret = sqlite_remove_client(cmsg->cm_u.cm_name.cn_id,
+				   cmsg->cm_u.cm_name.cn_len);
+
+reply:
+	cmsg->cm_status = ret ? -EREMOTEIO : ret;
+
+	bsize = cld_message_size(cmsg);
+	xlog(D_GENERAL, "%s: downcall with status %d", __func__,
+			cmsg->cm_status);
+	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
+	if (wsize != bsize) {
+		xlog(L_ERROR, "%s: problem writing to cld pipe (%zd): %m",
+			 __func__, wsize);
+		ret = cld_pipe_open(clnt);
+		if (ret) {
+			xlog(L_FATAL, "%s: unable to reopen pipe: %d",
+					__func__, ret);
+			exit(ret);
+		}
+	}
+}
+
+static void
+cld_check(struct cld_client *clnt)
+{
+	int ret;
+	ssize_t bsize, wsize;
+#if UPCALL_VERSION >= 2
+	struct cld_msg_v2 *cmsg = &clnt->cl_u.cl_msg_v2;
+#else
+	struct cld_msg *cmsg = &clnt->cl_u.cl_msg;
+#endif
+
+	/*
+	 * If we get a check upcall at all, it means we're talking to an old
+	 * kernel.  Furthermore, if we're not in grace it means this is the
+	 * first client to do a reclaim.  Log a message and use
+	 * sqlite_grace_start() to advance the epoch numbers.
+	 */
+	if (recovery_epoch == 0) {
+		xlog(D_GENERAL, "%s: received a check upcall, please update the kernel",
+			__func__);
+		ret = sqlite_grace_start();
+		if (ret)
+			goto reply;
+	}
+
+	xlog(D_GENERAL, "%s: check client record", __func__);
+
+	ret = sqlite_check_client(cmsg->cm_u.cm_name.cn_id,
+				  cmsg->cm_u.cm_name.cn_len);
+
+reply:
+	/* set up reply */
+	cmsg->cm_status = ret ? -EACCES : ret;
+
+	bsize = cld_message_size(cmsg);
+	xlog(D_GENERAL, "%s: downcall with status %d", __func__,
+			cmsg->cm_status);
+	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
+	if (wsize != bsize) {
+		xlog(L_ERROR, "%s: problem writing to cld pipe (%zd): %m",
+			 __func__, wsize);
+		ret = cld_pipe_open(clnt);
+		if (ret) {
+			xlog(L_FATAL, "%s: unable to reopen pipe: %d",
+					__func__, ret);
+			exit(ret);
+		}
+	}
+}
+
+static void
+cld_gracedone(struct cld_client *clnt)
+{
+	int ret;
+	ssize_t bsize, wsize;
+#if UPCALL_VERSION >= 2
+	struct cld_msg_v2 *cmsg = &clnt->cl_u.cl_msg_v2;
+#else
+	struct cld_msg *cmsg = &clnt->cl_u.cl_msg;
+#endif
+
+	/*
+	 * If we got a "gracedone" upcall while we're not in grace, then
+	 * 1) we must be talking to an old kernel
+	 * 2) no clients attempted to reclaim
+	 * In that case, log a message and use sqlite_grace_start() to
+	 * advance the epoch numbers, and then proceed as normal.
+	 */
+	if (recovery_epoch == 0) {
+		xlog(D_GENERAL, "%s: received gracedone upcall "
+			"while not in grace, please update the kernel",
+			__func__);
+		ret = sqlite_grace_start();
+		if (ret)
+			goto reply;
+	}
+
+	xlog(D_GENERAL, "%s: grace done.", __func__);
+
+	ret = sqlite_grace_done();
+
+	if (first_time) {
+		if (num_cltrack_records > 0)
+			sqlite_delete_cltrack_records();
+		if (num_legacy_records > 0)
+			legacy_clear_recdir();
+		sqlite_first_time_done();
+		first_time = 0;
+	}
+
+reply:
+	/* set up reply: downcall with 0 status */
+	cmsg->cm_status = ret ? -EREMOTEIO : ret;
+
+	bsize = cld_message_size(cmsg);
+	xlog(D_GENERAL, "Doing downcall with status %d", cmsg->cm_status);
+	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
+	if (wsize != bsize) {
+		xlog(L_ERROR, "%s: problem writing to cld pipe (%zd): %m",
+			 __func__, wsize);
+		ret = cld_pipe_open(clnt);
+		if (ret) {
+			xlog(L_FATAL, "%s: unable to reopen pipe: %d",
+					__func__, ret);
+			exit(ret);
+		}
+	}
+}
+
+static int
+gracestart_callback(struct cld_client *clnt) {
+	ssize_t bsize, wsize;
+#if UPCALL_VERSION >= 2
+	struct cld_msg_v2 *cmsg = &clnt->cl_u.cl_msg_v2;
+#else
+	struct cld_msg *cmsg = &clnt->cl_u.cl_msg;
+#endif
+
+	cmsg->cm_status = -EINPROGRESS;
+
+	bsize = cld_message_size(cmsg);
+	xlog(D_GENERAL, "Sending client %.*s",
+			cmsg->cm_u.cm_name.cn_len, cmsg->cm_u.cm_name.cn_id);
+	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
+	if (wsize != bsize)
+		return -EIO;
+	return 0;
+}
+
+static void
+cld_gracestart(struct cld_client *clnt)
+{
+	int ret;
+	ssize_t bsize, wsize;
+#if UPCALL_VERSION >= 2
+	struct cld_msg_v2 *cmsg = &clnt->cl_u.cl_msg_v2;
+#else
+	struct cld_msg *cmsg = &clnt->cl_u.cl_msg;
+#endif
+
+	xlog(D_GENERAL, "%s: updating grace epochs", __func__);
+
+	ret = sqlite_grace_start();
+	if (ret)
+		goto reply;
+
+	xlog(D_GENERAL, "%s: sending client records to the kernel", __func__);
+
+	ret = sqlite_iterate_recovery(&gracestart_callback, clnt);
+
+reply:
+	/* set up reply: downcall with 0 status */
+	cmsg->cm_status = ret ? -EREMOTEIO : ret;
+
+	bsize = cld_message_size(cmsg);
+	xlog(D_GENERAL, "Doing downcall with status %d", cmsg->cm_status);
+	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
+	if (wsize != bsize) {
+		xlog(L_ERROR, "%s: problem writing to cld pipe (%zd): %m",
+			 __func__, wsize);
+		ret = cld_pipe_open(clnt);
+		if (ret) {
+			xlog(L_FATAL, "%s: unable to reopen pipe: %d",
+					__func__, ret);
+			exit(ret);
+		}
+	}
+}
+
+static void
+cldcb(int UNUSED(fd), short which, void *data)
+{
+	ssize_t len;
+	struct cld_client *clnt = data;
+#if UPCALL_VERSION >= 2
+	struct cld_msg_v2 *cmsg = &clnt->cl_u.cl_msg_v2;
+#else
+	struct cld_msg *cmsg = &clnt->cl_u.cl_msg;
+#endif
+
+	if (which != EV_READ)
+		goto out;
+
+	len = atomicio(read, clnt->cl_fd, cmsg, sizeof(*cmsg));
+	if (len <= 0) {
+		xlog(L_ERROR, "%s: pipe read failed: %m", __func__);
+		cld_pipe_open(clnt);
+		goto out;
+	}
+
+	if (cmsg->cm_vers > UPCALL_VERSION) {
+		xlog(L_ERROR, "%s: unsupported upcall version: %hu",
+				__func__, cmsg->cm_vers);
+		cld_pipe_open(clnt);
+		goto out;
+	}
+
+	switch(cmsg->cm_cmd) {
+	case Cld_Create:
+		cld_create(clnt);
+		break;
+	case Cld_Remove:
+		cld_remove(clnt);
+		break;
+	case Cld_Check:
+		cld_check(clnt);
+		break;
+	case Cld_GraceDone:
+		cld_gracedone(clnt);
+		break;
+	case Cld_GraceStart:
+		cld_gracestart(clnt);
+		break;
+	case Cld_GetVersion:
+		cld_get_version(clnt);
+		break;
+	default:
+		xlog(L_WARNING, "%s: command %u is not yet implemented",
+				__func__, cmsg->cm_cmd);
+		cld_not_implemented(clnt);
+	}
+out:
+	event_add(clnt->cl_event, NULL);
+}
+
+int
+main(int argc, char **argv)
+{
+	int arg;
+	int rc = 0;
+	bool foreground = false;
+	char *progname;
+	char *storagedir = CLD_DEFAULT_STORAGEDIR;
+	struct cld_client clnt;
+	char *s;
+	first_time = 0;
+	num_cltrack_records = 0;
+	num_legacy_records = 0;
+
+	memset(&clnt, 0, sizeof(clnt));
+
+	progname = strdup(basename(argv[0]));
+	if (!progname) {
+		fprintf(stderr, "%s: unable to allocate memory.\n", argv[0]);
+		return 1;
+	}
+
+	evbase = event_base_new();
+	if (evbase == NULL) {
+		fprintf(stderr, "%s: unable to allocate event base.\n", argv[0]);
+		return 1;
+	}
+	xlog_syslog(0);
+	xlog_stderr(1);
+
+	conf_init_file(NFS_CONFFILE);
+	s = conf_get_str("general", "pipefs-directory");
+	if (s)
+		strlcpy(pipefs_dir, s, sizeof(pipefs_dir));
+	s = conf_get_str("nfsdcld", "storagedir");
+	if (s)
+		storagedir = s;
+	rc = conf_get_num("nfsdcld", "debug", 0);
+	if (rc > 0)
+		xlog_config(D_ALL, 1);
+
+	/* process command-line options */
+	while ((arg = getopt_long(argc, argv, "hdFp:s:", longopts,
+				  NULL)) != EOF) {
+		switch (arg) {
+		case 'd':
+			xlog_config(D_ALL, 1);
+			break;
+		case 'F':
+			foreground = true;
+			break;
+		case 'p':
+			strlcpy(pipefs_dir, optarg, sizeof(pipefs_dir));
+			break;
+		case 's':
+			storagedir = optarg;
+			break;
+		default:
+			usage(progname);
+			free(progname);
+			return 0;
+		}
+	}
+
+	strlcpy(pipepath, pipefs_dir, sizeof(pipepath));
+	strlcat(pipepath, DEFAULT_CLD_PATH, sizeof(pipepath));
+
+	xlog_open(progname);
+	if (!foreground) {
+		xlog_syslog(1);
+		xlog_stderr(0);
+		rc = daemon(0, 0);
+		if (rc) {
+			xlog(L_ERROR, "Unable to daemonize: %m");
+			goto out;
+		}
+	}
+
+	/* drop all capabilities */
+	rc = cld_set_caps();
+	if (rc)
+		goto out;
+
+	/*
+	 * now see if the storagedir is writable by root w/o CAP_DAC_OVERRIDE.
+	 * If it isn't then give the user a warning but proceed as if
+	 * everything is OK. If the DB has already been created, then
+	 * everything might still work. If it doesn't exist at all, then
+	 * assume that the maindb init will be able to create it. Fail on
+	 * anything else.
+	 */
+	if (access(storagedir, W_OK) == -1) {
+		switch (errno) {
+		case EACCES:
+			xlog(L_WARNING, "Storage directory %s is not writable. "
+					"Should be owned by root and writable "
+					"by owner!", storagedir);
+			break;
+		case ENOENT:
+			/* ignore and assume that we can create dir as root */
+			break;
+		default:
+			xlog(L_ERROR, "Unexpected error when checking access "
+				      "on %s: %m", storagedir);
+			rc = -errno;
+			goto out;
+		}
+	}
+
+	if (linux_version_code() < MAKE_VERSION(4, 20, 0))
+		old_kernel = true;
+
+	/* set up storage db */
+	rc = sqlite_prepare_dbh(storagedir);
+	if (rc) {
+		xlog(L_ERROR, "Failed to open main database: %d", rc);
+		goto out;
+	}
+
+	/* set up event handler */
+	rc = cld_pipe_init(&clnt);
+	if (rc)
+		goto out;
+
+	signal(SIGINT, sig_die);
+	signal(SIGTERM, sig_die);
+
+	xlog(D_GENERAL, "%s: Starting event dispatch handler.", __func__);
+	rc = event_base_dispatch(evbase);
+	if (rc < 0)
+		xlog(L_ERROR, "%s: event_dispatch failed: %m", __func__);
+
+out:
+	if (clnt.cl_event)
+		event_free(clnt.cl_event);
+	if (clnt.cl_fd != -1)
+		close(clnt.cl_fd);
+	if (pipedir_event)
+		event_free(pipedir_event);
+	if (inotify_fd != -1)
+		close(inotify_fd);
+
+	event_base_free(evbase);
+	sqlite_shutdown();
+
+	free(progname);
+	return rc;
+}
diff --git a/utils/nfsdcld/nfsdcld.man b/utils/nfsdcld/nfsdcld.man
new file mode 100644
index 0000000..861f1c4
--- /dev/null
+++ b/utils/nfsdcld/nfsdcld.man
@@ -0,0 +1,221 @@
+.\" Automatically generated by Pod::Man 2.22 (Pod::Simple 3.13)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Vb \" Begin verbatim text
+.ft CW
+.nf
+.ne \\$1
+..
+.de Ve \" End verbatim text
+.ft R
+.fi
+..
+.\" Set up some character translations and predefined strings.  \*(-- will
+.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
+.\" double quote, and \*(R" will give a right double quote.  \*(C+ will
+.\" give a nicer C++.  Capital omega is used to do unbreakable dashes and
+.\" therefore won't be available.  \*(C` and \*(C' expand to `' in nroff,
+.\" nothing in troff, for use with C<>.
+.tr \(*W-
+.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
+.ie n \{\
+.    ds -- \(*W-
+.    ds PI pi
+.    if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
+.    if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\"  diablo 12 pitch
+.    ds L" ""
+.    ds R" ""
+.    ds C` ""
+.    ds C' ""
+'br\}
+.el\{\
+.    ds -- \|\(em\|
+.    ds PI \(*p
+.    ds L" ``
+.    ds R" ''
+'br\}
+.\"
+.\" Escape single quotes in literal strings from groff's Unicode transform.
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\"
+.\" If the F register is turned on, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD.  Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.ie \nF \{\
+.    de IX
+.    tm Index:\\$1\t\\n%\t"\\$2"
+..
+.    nr % 0
+.    rr F
+.\}
+.el \{\
+.    de IX
+..
+.\}
+.\"
+.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
+.\" Fear.  Run.  Save yourself.  No user-serviceable parts.
+.    \" fudge factors for nroff and troff
+.if n \{\
+.    ds #H 0
+.    ds #V .8m
+.    ds #F .3m
+.    ds #[ \f1
+.    ds #] \fP
+.\}
+.if t \{\
+.    ds #H ((1u-(\\\\n(.fu%2u))*.13m)
+.    ds #V .6m
+.    ds #F 0
+.    ds #[ \&
+.    ds #] \&
+.\}
+.    \" simple accents for nroff and troff
+.if n \{\
+.    ds ' \&
+.    ds ` \&
+.    ds ^ \&
+.    ds , \&
+.    ds ~ ~
+.    ds /
+.\}
+.if t \{\
+.    ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
+.    ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
+.    ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
+.    ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
+.    ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
+.    ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
+.\}
+.    \" troff and (daisy-wheel) nroff accents
+.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
+.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
+.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
+.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
+.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
+.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
+.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
+.ds ae a\h'-(\w'a'u*4/10)'e
+.ds Ae A\h'-(\w'A'u*4/10)'E
+.    \" corrections for vroff
+.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
+.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
+.    \" for low resolution devices (crt and lpr)
+.if \n(.H>23 .if \n(.V>19 \
+\{\
+.    ds : e
+.    ds 8 ss
+.    ds o a
+.    ds d- d\h'-1'\(ga
+.    ds D- D\h'-1'\(hy
+.    ds th \o'bp'
+.    ds Th \o'LP'
+.    ds ae ae
+.    ds Ae AE
+.\}
+.rm #[ #] #H #V #F C
+.\" ========================================================================
+.\"
+.IX Title "NFSDCLD 8"
+.TH NFSDCLD 8 "2011-12-21" "" ""
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+nfsdcld \- NFSv4 Client Tracking Daemon
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+nfsdcld [\-d] [\-F] [\-p path] [\-s stable storage dir]
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+nfsdcld is the NFSv4 client tracking daemon. It is not necessary to run
+this daemon on machines that are not acting as NFSv4 servers.
+.PP
+When a network partition is combined with a server reboot, there are
+edge conditions that can cause the server to grant lock reclaims when
+other clients have taken conflicting locks in the interim. A more detailed
+explanation of this issue is described in \s-1RFC\s0 3530, section 8.6.3.
+.PP
+In order to prevent these problems, the server must track a small amount
+of per-client information on stable storage. This daemon provides the
+userspace piece of that functionality.
+.SH "OPTIONS"
+.IX Header "OPTIONS"
+.IP "\fB\-d\fR, \fB\-\-debug\fR" 4
+.IX Item "-d, --debug"
+Enable debug level logging.
+.IP "\fB\-F\fR, \fB\-\-foreground\fR" 4
+.IX Item "-F, --foreground"
+Runs the daemon in the foreground and prints all output to stderr
+.IP "\fB\-p\fR \fIpath\fR, \fB\-\-pipefsdir\fR=\fIpath\fR" 4
+.IX Item "-p path, --pipefsdir=path"
+Location of the rpc_pipefs filesystem. The default value is
+\&\fI/var/lib/nfs/rpc_pipefs\fR.
+.IP "\fB\-s\fR \fIstorage_dir\fR, \fB\-\-storagedir\fR=\fIstorage_dir\fR" 4
+.IX Item "-s storagedir, --storagedir=storage_dir"
+Directory where stable storage information should be kept. The default
+value is \fI/var/lib/nfs/nfsdcld\fR.
+.SH "CONFIGURATION FILE"
+.IX Header "CONFIGURATION FILE"
+The following values are recognized in the \fB[nfsdcld]\fR section
+of the \fI/etc/nfs.conf\fR configuration file:
+.IP "\fBstoragedir\fR" 4
+.IX Item "storagedir"
+Equivalent to \fB\-s\fR/\fB\-\-storagedir\fR.
+.IP "\fBdebug\fR" 4
+.IX Item "debug"
+Setting "debug = 1" is equivalent to \fB\-d\fR/\fB\-\-debug\fR.
+.LP
+In addition, the following value is recognized from the \fB[general]\fR section:
+.IP "\fBpipefs\-directory\fR" 4
+.IX Item "pipefs-directory"
+Equivalent to \fB\-p\fR/\fB\-\-pipefsdir\fR.
+.SH "NOTES"
+.IX Header "NOTES"
+The Linux kernel NFSv4 server has historically tracked this information
+on stable storage by manipulating information on the filesystem
+directly, in the directory to which \fI/proc/fs/nfsd/nfsv4recoverydir\fR
+points.
+.PP
+This changed with the original introduction of \fBnfsdcld\fR upcall in kernel version 3.4,
+which was later deprecated in favor of the \fBnfsdcltrack\fR(8) usermodehelper
+program, support for which was added in kernel version 3.8.  However, since the
+usermodehelper upcall does not work in containers, support for a new version of
+the \fBnfsdcld\fR upcall was added in kernel version 5.2.
+.PP
+This daemon requires a kernel that supports the \fBnfsdcld\fR upcall. On older kernels, if
+the legacy client name tracking code was in use, then the kernel would not create the
+pipe that \fBnfsdcld\fR uses to talk to the kernel.  On newer kernels, nfsd attempts to
+initialize client tracking in the following order:  First, the \fBnfsdcld\fR upcall.  Second,
+the \fBnfsdcltrack\fR usermodehelper upcall.  Finally, the legacy client tracking.
+.PP
+This daemon should be run as root, as the pipe that it uses to communicate
+with the kernel is only accessable by root. The daemon however does drop all
+superuser capabilities after starting. Because of this, the \fIstoragedir\fR
+should be owned by root, and be readable and writable by owner.
+.PP
+The daemon now supports different upcall versions to allow the kernel to pass additional
+data to be stored in the on-disk database.  The kernel will query the supported upcall
+version from \fBnfsdcld\fR during client tracking initialization.  A restart of \fBnfsd\fR is
+not necessary after upgrading \fBnfsdcld\fR, however \fBnfsd\fR will not use a later upcall
+version until restart.  A restart of \fBnfsd is necessary\fR after downgrading \fBnfsdcld\fR,
+to ensure that \fBnfsd\fR does not use an upcall version that \fBnfsdcld\fR does not support.
+Additionally, a downgrade of \fBnfsdcld\fR requires the schema of the on-disk database to
+be downgraded as well.  That can be accomplished using the \fBnfsdclddb\fR(8) utility.
+.SH FILES
+.TP
+.B /var/lib/nfs/nfsdcld/main.sqlite
+.SH SEE ALSO
+.BR nfsdcltrack "(8), " nfsdclddb (8)
+.SH "AUTHORS"
+.IX Header "AUTHORS"
+The nfsdcld daemon was developed by Jeff Layton <jlayton@redhat.com>
+with modifications from Scott Mayhew <smayhew@redhat.com>.
diff --git a/utils/nfsdcld/sqlite.c b/utils/nfsdcld/sqlite.c
new file mode 100644
index 0000000..03016fb
--- /dev/null
+++ b/utils/nfsdcld/sqlite.c
@@ -0,0 +1,1427 @@
+/*
+ * Copyright (C) 2011  Red Hat, Jeff Layton <jlayton@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+/*
+ * Explanation:
+ *
+ * This file contains the code to manage the sqlite backend database for the
+ * nfsdcld client tracking daemon.
+ *
+ * The main database is called main.sqlite and contains the following tables:
+ *
+ * parameters: simple key/value pairs for storing database info
+ *
+ * grace: a "current" column containing an INTEGER representing the current
+ *        epoch (where should new values be stored) and a "recovery" column
+ *        containing an INTEGER representing the recovery epoch (from what
+ *        epoch are we allowed to recover).  A recovery epoch of 0 means
+ *        normal operation (grace period not in force).  Note: sqlite stores
+ *        integers as signed values, so these must be cast to a uint64_t when
+ *        retrieving them from the database and back to an int64_t when storing
+ *        them in the database.
+ *
+ * rec-CCCCCCCCCCCCCCCC (where C is the hex representation of the epoch value):
+ *        an "id" column containing a BLOB with the long-form clientid
+ *        as sent by the client, and a "princhash" column containing a BLOB
+ *        with the sha256 hash of the kerberos principal (if available).
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <dirent.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
+#include <sqlite3.h>
+#include <linux/limits.h>
+#include <inttypes.h>
+
+#include "xlog.h"
+#include "sqlite.h"
+#include "cld.h"
+#include "cld-internal.h"
+#include "conffile.h"
+#include "legacy.h"
+#include "nfslib.h"
+
+#define CLD_SQLITE_LATEST_SCHEMA_VERSION 4
+#define CLTRACK_DEFAULT_STORAGEDIR NFS_STATEDIR "/nfsdcltrack"
+
+/* in milliseconds */
+#define CLD_SQLITE_BUSY_TIMEOUT 10000
+
+/* private data structures */
+
+/* global variables */
+static char *cltrack_storagedir = CLTRACK_DEFAULT_STORAGEDIR;
+
+/* reusable pathname and sql command buffer */
+static char buf[PATH_MAX];
+
+/* global database handle */
+static sqlite3 *dbh;
+
+/* forward declarations */
+
+/* make a directory, ignoring EEXIST errors unless it's not a directory */
+static int
+mkdir_if_not_exist(const char *dirname)
+{
+	int ret;
+	struct stat statbuf;
+
+	ret = mkdir(dirname, S_IRWXU);
+	if (ret && errno != EEXIST)
+		return -errno;
+
+	ret = stat(dirname, &statbuf);
+	if (ret)
+		return -errno;
+
+	if (!S_ISDIR(statbuf.st_mode))
+		ret = -ENOTDIR;
+
+	return ret;
+}
+
+static int
+sqlite_query_schema_version(void)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+
+	/* prepare select query */
+	ret = sqlite3_prepare_v2(dbh,
+		"SELECT value FROM parameters WHERE key == \"version\";",
+		 -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(D_GENERAL, "Unable to prepare select statement: %s",
+			sqlite3_errmsg(dbh));
+		ret = 0;
+		goto out;
+	}
+
+	/* query schema version */
+	ret = sqlite3_step(stmt);
+	if (ret != SQLITE_ROW) {
+		xlog(D_GENERAL, "Select statement execution failed: %s",
+				sqlite3_errmsg(dbh));
+		ret = 0;
+		goto out;
+	}
+
+	ret = sqlite3_column_int(stmt, 0);
+out:
+	sqlite3_finalize(stmt);
+	return ret;
+}
+
+static int
+sqlite_query_first_time(int *first_time)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+
+	/* prepare select query */
+	ret = sqlite3_prepare_v2(dbh,
+		"SELECT value FROM parameters WHERE key == \"first_time\";",
+		 -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(D_GENERAL, "Unable to prepare select statement: %s",
+			sqlite3_errmsg(dbh));
+		goto out;
+	}
+
+	/* query first_time */
+	ret = sqlite3_step(stmt);
+	if (ret != SQLITE_ROW) {
+		xlog(D_GENERAL, "Select statement execution failed: %s",
+				sqlite3_errmsg(dbh));
+		goto out;
+	}
+
+	*first_time = sqlite3_column_int(stmt, 0);
+	ret = 0;
+out:
+	sqlite3_finalize(stmt);
+	return ret;
+}
+
+static int
+sqlite_add_princ_col_cb(void *UNUSED(arg), int ncols, char **cols,
+			    char **UNUSED(colnames))
+{
+	int ret;
+	char *err;
+
+	if (ncols > 1)
+		return -EINVAL;
+	ret = snprintf(buf, sizeof(buf), "ALTER TABLE \"%s\" "
+			"ADD COLUMN princhash BLOB;", cols[0]);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		return -EINVAL;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		return -EINVAL;
+	}
+	ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to add princhash column to table %s: %s",
+		     cols[0], err);
+		goto out;
+	}
+	xlog(D_GENERAL, "Added princhash column to table %s", cols[0]);
+out:
+	sqlite3_free(err);
+	return ret;
+}
+
+static int
+sqlite_maindb_update_v3_to_v4(void)
+{
+	int ret;
+	char *err;
+
+	ret = sqlite3_exec(dbh, "SELECT name FROM sqlite_master "
+			   "WHERE type=\"table\" AND name LIKE \"%rec-%\";",
+			   sqlite_add_princ_col_cb, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: Failed to update tables!: %s", __func__, err);
+	}
+	sqlite3_free(err);
+	return ret;
+}
+
+static int
+sqlite_maindb_update_v1v2_to_v4(void)
+{
+	int ret;
+	char *err;
+
+	/* create grace table */
+	ret = sqlite3_exec(dbh, "CREATE TABLE grace "
+				"(current INTEGER , recovery INTEGER);",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to create grace table: %s", err);
+		goto out;
+	}
+
+	/* insert initial epochs into grace table */
+	ret = sqlite3_exec(dbh, "INSERT OR FAIL INTO grace "
+				"values (1, 0);",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to set initial epochs: %s", err);
+		goto out;
+	}
+
+	/* create recovery table for current epoch */
+	ret = sqlite3_exec(dbh, "CREATE TABLE \"rec-0000000000000001\" "
+				"(id BLOB PRIMARY KEY, princhash BLOB);",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to create recovery table "
+				"for current epoch: %s", err);
+		goto out;
+	}
+
+	/* copy records from old clients table */
+	ret = sqlite3_exec(dbh, "INSERT INTO \"rec-0000000000000001\" (id) "
+				"SELECT id FROM clients;",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to copy client records: %s", err);
+		goto out;
+	}
+
+	/* drop the old clients table */
+	ret = sqlite3_exec(dbh, "DROP TABLE clients;",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to drop old clients table: %s", err);
+	}
+out:
+	sqlite3_free(err);
+	return ret;
+}
+
+static int
+sqlite_maindb_update_schema(int oldversion)
+{
+	int ret, ret2;
+	char *err;
+
+	/* begin transaction */
+	ret = sqlite3_exec(dbh, "BEGIN EXCLUSIVE TRANSACTION;", NULL, NULL,
+				&err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to begin transaction: %s", err);
+		goto rollback;
+	}
+
+	/*
+	 * Check schema version again. This time, under an exclusive
+	 * transaction to guard against racing DB setup attempts
+	 */
+	ret = sqlite_query_schema_version();
+	if (ret != oldversion) {
+		if (ret == CLD_SQLITE_LATEST_SCHEMA_VERSION)
+			/* Someone else raced in and set it up */
+			ret = 0;
+		else
+			/* Something went wrong -- fail! */
+			ret = -EINVAL;
+		goto rollback;
+	}
+
+	/* Still at old version -- do conversion */
+
+	switch (oldversion) {
+	case 3:
+	case 2:
+		ret = sqlite_maindb_update_v3_to_v4();
+		break;
+	case 1:
+		ret = sqlite_maindb_update_v1v2_to_v4();
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	if (ret != SQLITE_OK)
+		goto rollback;
+
+	ret = snprintf(buf, sizeof(buf), "UPDATE parameters SET value = %d "
+			"WHERE key = \"version\";",
+			CLD_SQLITE_LATEST_SCHEMA_VERSION);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		goto rollback;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		ret = -EINVAL;
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to update schema version: %s", err);
+		goto rollback;
+	}
+
+	ret = sqlite_query_first_time(&first_time);
+	if (ret != SQLITE_OK) {
+		/* insert first_time into parameters table */
+		ret = sqlite3_exec(dbh, "INSERT OR FAIL INTO parameters "
+					"values (\"first_time\", \"1\");",
+					NULL, NULL, &err);
+		if (ret != SQLITE_OK) {
+			xlog(L_ERROR, "Unable to insert into parameter table: %s", err);
+			goto rollback;
+		}
+	}
+
+	ret = sqlite3_exec(dbh, "COMMIT TRANSACTION;", NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to commit transaction: %s", err);
+		goto rollback;
+	}
+out:
+	sqlite3_free(err);
+	return ret;
+rollback:
+	ret2 = sqlite3_exec(dbh, "ROLLBACK TRANSACTION;", NULL, NULL, &err);
+	if (ret2 != SQLITE_OK)
+		xlog(L_ERROR, "Unable to rollback transaction: %s", err);
+	goto out;
+}
+
+/*
+ * Start an exclusive transaction and recheck the DB schema version. If it's
+ * still zero (indicating a new database) then set it up. If that all works,
+ * then insert schema version into the parameters table and commit the
+ * transaction. On any error, rollback the transaction.
+ */
+static int
+sqlite_maindb_init_v4(void)
+{
+	int ret, ret2;
+	char *err = NULL;
+
+	/* Start a transaction */
+	ret = sqlite3_exec(dbh, "BEGIN EXCLUSIVE TRANSACTION;", NULL, NULL,
+				&err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to begin transaction: %s", err);
+		goto out;
+	}
+
+	/*
+	 * Check schema version again. This time, under an exclusive
+	 * transaction to guard against racing DB setup attempts
+	 */
+	ret = sqlite_query_schema_version();
+	switch (ret) {
+	case 0:
+		/* Query failed again -- set up DB */
+		break;
+	case CLD_SQLITE_LATEST_SCHEMA_VERSION:
+		/* Someone else raced in and set it up */
+		ret = 0;
+		goto rollback;
+	default:
+		/* Something went wrong -- fail! */
+		ret = -EINVAL;
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, "CREATE TABLE parameters "
+				"(key TEXT PRIMARY KEY, value TEXT);",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to create parameter table: %s", err);
+		goto rollback;
+	}
+
+	/* create grace table */
+	ret = sqlite3_exec(dbh, "CREATE TABLE grace "
+				"(current INTEGER , recovery INTEGER);",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to create grace table: %s", err);
+		goto rollback;
+	}
+
+	/* insert initial epochs into grace table */
+	ret = sqlite3_exec(dbh, "INSERT OR FAIL INTO grace "
+				"values (1, 0);",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to set initial epochs: %s", err);
+		goto rollback;
+	}
+
+	/* create recovery table for current epoch */
+	ret = sqlite3_exec(dbh, "CREATE TABLE \"rec-0000000000000001\" "
+				"(id BLOB PRIMARY KEY, princhash BLOB);",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to create recovery table "
+				"for current epoch: %s", err);
+		goto rollback;
+	}
+
+	/* insert version into parameters table */
+	ret = snprintf(buf, sizeof(buf), "INSERT OR FAIL INTO parameters "
+			"values (\"version\", \"%d\");",
+			CLD_SQLITE_LATEST_SCHEMA_VERSION);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		goto rollback;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		ret = -EINVAL;
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to insert into parameter table: %s", err);
+		goto rollback;
+	}
+
+	/* insert first_time into parameters table */
+	ret = sqlite3_exec(dbh, "INSERT OR FAIL INTO parameters "
+				"values (\"first_time\", \"1\");",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to insert into parameter table: %s", err);
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, "COMMIT TRANSACTION;", NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to commit transaction: %s", err);
+		goto rollback;
+	}
+out:
+	sqlite3_free(err);
+	return ret;
+
+rollback:
+	/* Attempt to rollback the transaction */
+	ret2 = sqlite3_exec(dbh, "ROLLBACK TRANSACTION;", NULL, NULL, &err);
+	if (ret2 != SQLITE_OK)
+		xlog(L_ERROR, "Unable to rollback transaction: %s", err);
+	goto out;
+}
+
+static int
+sqlite_startup_query_grace(void)
+{
+	int ret;
+	uint64_t tcur;
+	uint64_t trec;
+	sqlite3_stmt *stmt = NULL;
+
+	/* prepare select query */
+	ret = sqlite3_prepare_v2(dbh, "SELECT * FROM grace;", -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(D_GENERAL, "Unable to prepare select statement: %s",
+			sqlite3_errmsg(dbh));
+		goto out;
+	}
+
+	ret = sqlite3_step(stmt);
+	if (ret != SQLITE_ROW) {
+		xlog(D_GENERAL, "Select statement execution failed: %s",
+				sqlite3_errmsg(dbh));
+		goto out;
+	}
+
+	tcur = (uint64_t)sqlite3_column_int64(stmt, 0);
+	trec = (uint64_t)sqlite3_column_int64(stmt, 1);
+
+	current_epoch = tcur;
+	recovery_epoch = trec;
+	ret = 0;
+	xlog(D_GENERAL, "%s: current_epoch=%"PRIu64" recovery_epoch=%"PRIu64,
+		__func__, current_epoch, recovery_epoch);
+out:
+	sqlite3_finalize(stmt);
+	return ret;
+}
+
+/*
+ * Helper for renaming a recovery table to fix the padding.
+ */
+static int
+sqlite_fix_table_name(const char *name)
+{
+	int ret;
+	uint64_t val;
+	char *err;
+
+	if (sscanf(name, "rec-%" PRIx64, &val) != 1)
+		return -EINVAL;
+	ret = snprintf(buf, sizeof(buf), "ALTER TABLE \"%s\" "
+			"RENAME TO \"rec-%016" PRIx64 "\";",
+			name, val);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		return -EINVAL;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		return -EINVAL;
+	}
+	ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to fix table for epoch %"PRIu64": %s",
+		     val, err);
+		goto out;
+	}
+	xlog(D_GENERAL, "Renamed table %s to rec-%016" PRIx64, name, val);
+out:
+	sqlite3_free(err);
+	return ret;
+}
+
+/*
+ * Callback for the sqlite_exec statement in sqlite_check_table_names.
+ * If the epoch encoded in the table name matches either the current
+ * epoch or the recovery epoch, then try to fix the padding.  Otherwise,
+ * we bail.
+ */
+static int
+sqlite_check_table_names_cb(void *UNUSED(arg), int ncols, char **cols,
+			    char **UNUSED(colnames))
+{
+	int ret = SQLITE_OK;
+	uint64_t val;
+
+	if (ncols > 1)
+		return -EINVAL;
+	if (sscanf(cols[0], "rec-%" PRIx64, &val) != 1)
+		return -EINVAL;
+	if (val == current_epoch || val == recovery_epoch) {
+		xlog(D_GENERAL, "found invalid table name %s for %s epoch",
+		     cols[0], val == current_epoch ? "current" : "recovery");
+		ret = sqlite_fix_table_name(cols[0]);
+	} else {
+		xlog(L_ERROR, "found invalid table name %s for unknown epoch %"
+		     PRId64, cols[0], val);
+		return -EINVAL;
+	}
+	return ret;
+}
+
+/*
+ * Look for recovery table names where the epoch isn't zero-padded
+ */
+static int
+sqlite_check_table_names(void)
+{
+	int ret;
+	char *err;
+
+	ret = sqlite3_exec(dbh, "SELECT name FROM sqlite_master "
+			   "WHERE type=\"table\" AND name LIKE \"%rec-%\" "
+			   "AND length(name) < 20;",
+			   sqlite_check_table_names_cb, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Table names check failed: %s", err);
+	}
+	sqlite3_free(err);
+	return ret;
+}
+
+/*
+ * Simple db health check.  For now we're just making sure that the recovery
+ * table names are of the format "rec-CCCCCCCCCCCCCCCC" (where C is the hex
+ * representation of the epoch value) and that epoch value matches either
+ * the current epoch or the recovery epoch.
+ */
+static int
+sqlite_check_db_health(void)
+{
+	int ret, ret2;
+	char *err;
+
+	ret = sqlite3_exec(dbh, "BEGIN EXCLUSIVE TRANSACTION;", NULL, NULL,
+				&err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to begin transaction: %s", err);
+		goto rollback;
+	}
+
+	ret = sqlite_check_table_names();
+	if (ret != SQLITE_OK)
+		goto rollback;
+
+	ret = sqlite3_exec(dbh, "COMMIT TRANSACTION;", NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to commit transaction: %s", err);
+		goto rollback;
+	}
+
+cleanup:
+	sqlite3_free(err);
+	xlog(D_GENERAL, "%s: returning %d", __func__, ret);
+	return ret;
+rollback:
+	ret2 = sqlite3_exec(dbh, "ROLLBACK TRANSACTION;", NULL, NULL, &err);
+	if (ret2 != SQLITE_OK)
+		xlog(L_ERROR, "Unable to rollback transaction: %s", err);
+	goto cleanup;
+}
+
+static int
+sqlite_attach_db(const char *path)
+{
+	int ret;
+	char dbpath[PATH_MAX];
+	struct stat stb;
+	sqlite3_stmt *stmt = NULL;
+
+	ret = snprintf(dbpath, PATH_MAX - 1, "%s/main.sqlite", path);
+	if (ret < 0)
+		return ret;
+
+	dbpath[PATH_MAX - 1] = '\0';
+	ret = stat(dbpath, &stb);
+	if (ret < 0)
+		return ret;
+
+	xlog(D_GENERAL, "attaching %s", dbpath);
+	ret = sqlite3_prepare_v2(dbh, "ATTACH DATABASE ? AS attached;",
+			-1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: unable to prepare attach statement: %s",
+				__func__, sqlite3_errmsg(dbh));
+		return ret;
+	}
+
+	ret = sqlite3_bind_text(stmt, 1, dbpath, strlen(dbpath), SQLITE_STATIC);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: bind text failed: %s",
+				__func__, sqlite3_errmsg(dbh));
+		return ret;
+	}
+
+	ret = sqlite3_step(stmt);
+	if (ret == SQLITE_DONE)
+		ret = SQLITE_OK;
+	else
+		xlog(L_ERROR, "%s: unexpected return code from attach: %s",
+				__func__, sqlite3_errmsg(dbh));
+
+	sqlite3_finalize(stmt);
+	stmt = NULL;
+	return ret;
+}
+
+static int
+sqlite_detach_db(void)
+{
+	int ret;
+	char *err = NULL;
+
+	xlog(D_GENERAL, "detaching database");
+	ret = sqlite3_exec(dbh, "DETACH DATABASE attached;", NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to detach attached db: %s", err);
+	}
+
+	sqlite3_free(err);
+	return ret;
+}
+
+/*
+ * Copies client records from the nfsdcltrack database as part of a one-time
+ * "upgrade".
+ *
+ * Returns a non-zero sqlite error code, or SQLITE_OK (aka 0).
+ * Returns the number of records copied via "num_rec".
+ */
+static int
+sqlite_copy_cltrack_records(int *num_rec)
+{
+	int ret, ret2;
+	char *s;
+	char *err = NULL;
+	sqlite3_stmt *stmt = NULL;
+
+	s = conf_get_str("nfsdcltrack", "storagedir");
+	if (s)
+		cltrack_storagedir = s;
+	ret = sqlite_attach_db(cltrack_storagedir);
+	if (ret)
+		goto out;
+	ret = sqlite3_exec(dbh, "BEGIN EXCLUSIVE TRANSACTION;", NULL, NULL,
+				&err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to begin transaction: %s", err);
+		goto rollback;
+	}
+	ret = snprintf(buf, sizeof(buf), "DELETE FROM \"rec-%016" PRIx64 "\";",
+			current_epoch);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		goto rollback;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		ret = -EINVAL;
+		goto rollback;
+	}
+	ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to clear records from current epoch: %s", err);
+		goto rollback;
+	}
+	ret = snprintf(buf, sizeof(buf), "INSERT INTO \"rec-%016" PRIx64 "\" (id) "
+				"SELECT id FROM attached.clients;",
+				current_epoch);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		goto rollback;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		ret = -EINVAL;
+		goto rollback;
+	}
+	ret = sqlite3_prepare_v2(dbh, buf, -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: insert statement prepare failed: %s",
+			__func__, sqlite3_errmsg(dbh));
+		goto rollback;
+	}
+	ret = sqlite3_step(stmt);
+	if (ret != SQLITE_DONE) {
+		xlog(L_ERROR, "%s: unexpected return code from insert: %s",
+				__func__, sqlite3_errmsg(dbh));
+		goto rollback;
+	}
+	*num_rec = sqlite3_changes(dbh);
+	ret = sqlite3_exec(dbh, "COMMIT TRANSACTION;", NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to commit transaction: %s", err);
+		goto rollback;
+	}
+cleanup:
+	sqlite3_finalize(stmt);
+	sqlite3_free(err);
+	sqlite_detach_db();
+out:
+	xlog(D_GENERAL, "%s: returning %d", __func__, ret);
+	return ret;
+rollback:
+	*num_rec = 0;
+	ret2 = sqlite3_exec(dbh, "ROLLBACK TRANSACTION;", NULL, NULL, &err);
+	if (ret2 != SQLITE_OK)
+		xlog(L_ERROR, "Unable to rollback transaction: %s", err);
+	goto cleanup;
+}
+
+/* Open the database and set up the database handle for it */
+int
+sqlite_prepare_dbh(const char *topdir)
+{
+	int ret;
+
+	/* Do nothing if the database handle is already set up */
+	if (dbh)
+		return 0;
+
+	ret = snprintf(buf, PATH_MAX - 1, "%s/main.sqlite", topdir);
+	if (ret < 0)
+		return ret;
+
+	buf[PATH_MAX - 1] = '\0';
+
+	/* open a new DB handle */
+	ret = sqlite3_open(buf, &dbh);
+	if (ret != SQLITE_OK) {
+		/* try to create the dir */
+		ret = mkdir_if_not_exist(topdir);
+		if (ret)
+			goto out_close;
+
+		/* retry open */
+		ret = sqlite3_open(buf, &dbh);
+		if (ret != SQLITE_OK)
+			goto out_close;
+	}
+
+	/* set busy timeout */
+	ret = sqlite3_busy_timeout(dbh, CLD_SQLITE_BUSY_TIMEOUT);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to set sqlite busy timeout: %s",
+				sqlite3_errmsg(dbh));
+		goto out_close;
+	}
+
+	ret = sqlite_query_schema_version();
+	switch (ret) {
+	case CLD_SQLITE_LATEST_SCHEMA_VERSION:
+		/* DB is already set up. Do nothing */
+		break;
+	case 3:
+		/* Old DB -- update to new schema */
+		ret = sqlite_maindb_update_schema(3);
+		if (ret)
+			goto out_close;
+		break;
+	case 2:
+		/* Old DB -- update to new schema */
+		ret = sqlite_maindb_update_schema(2);
+		if (ret)
+			goto out_close;
+		break;
+
+	case 1:
+		/* Old DB -- update to new schema */
+		ret = sqlite_maindb_update_schema(1);
+		if (ret)
+			goto out_close;
+		break;
+	case 0:
+		/* Query failed -- try to set up new DB */
+		ret = sqlite_maindb_init_v4();
+		if (ret)
+			goto out_close;
+		break;
+	default:
+		/* Unknown DB version -- downgrade? Fail */
+		xlog(L_ERROR, "Unsupported database schema version! "
+			"Expected %d, got %d.",
+			CLD_SQLITE_LATEST_SCHEMA_VERSION, ret);
+		ret = -EINVAL;
+		goto out_close;
+	}
+
+	ret = sqlite_startup_query_grace();
+	if (ret)
+		goto out_close;
+
+	ret = sqlite_query_first_time(&first_time);
+	if (ret)
+		goto out_close;
+
+	ret = sqlite_check_db_health();
+	if (ret) {
+		xlog(L_ERROR, "Database health check failed! "
+			"Database must be fixed manually.");
+		goto out_close;
+	}
+
+	/* one-time "upgrade" from older client tracking methods */
+	if (first_time) {
+		sqlite_copy_cltrack_records(&num_cltrack_records);
+		xlog(D_GENERAL, "%s: num_cltrack_records = %d\n",
+			__func__, num_cltrack_records);
+		legacy_load_clients_from_recdir(&num_legacy_records);
+		xlog(D_GENERAL, "%s: num_legacy_records = %d\n",
+			__func__, num_legacy_records);
+		if (num_cltrack_records > 0 && num_legacy_records > 0)
+			xlog(L_WARNING, "%s: first-time upgrade detected "
+				"both cltrack and legacy records!\n", __func__);
+	}
+
+	return ret;
+out_close:
+	sqlite3_close(dbh);
+	dbh = NULL;
+	return ret;
+}
+
+/*
+ * Create a client record
+ *
+ * Returns a non-zero sqlite error code, or SQLITE_OK (aka 0)
+ */
+int
+sqlite_insert_client(const unsigned char *clname, const size_t namelen)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+
+	ret = snprintf(buf, sizeof(buf), "INSERT OR REPLACE INTO \"rec-%016" PRIx64 "\" (id) "
+				"VALUES (?);", current_epoch);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		return ret;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		return -EINVAL;
+	}
+
+	ret = sqlite3_prepare_v2(dbh, buf, -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: insert statement prepare failed: %s",
+			__func__, sqlite3_errmsg(dbh));
+		return ret;
+	}
+
+	ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen,
+				SQLITE_STATIC);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: bind blob failed: %s", __func__,
+				sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_step(stmt);
+	if (ret == SQLITE_DONE)
+		ret = SQLITE_OK;
+	else
+		xlog(L_ERROR, "%s: unexpected return code from insert: %s",
+				__func__, sqlite3_errmsg(dbh));
+
+out_err:
+	xlog(D_GENERAL, "%s: returning %d", __func__, ret);
+	sqlite3_finalize(stmt);
+	return ret;
+}
+
+#if UPCALL_VERSION >= 2
+/*
+ * Create a client record including hash the kerberos principal
+ *
+ * Returns a non-zero sqlite error code, or SQLITE_OK (aka 0)
+ */
+int
+sqlite_insert_client_and_princhash(const unsigned char *clname, const size_t namelen,
+		const unsigned char *clprinchash, const size_t princhashlen)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+
+	if (princhashlen > 0)
+		ret = snprintf(buf, sizeof(buf), "INSERT OR REPLACE INTO \"rec-%016" PRIx64 "\" "
+				"VALUES (?, ?);", current_epoch);
+	else
+		ret = snprintf(buf, sizeof(buf), "INSERT OR REPLACE INTO \"rec-%016" PRIx64 "\" (id) "
+				"VALUES (?);", current_epoch);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		return ret;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		return -EINVAL;
+	}
+
+	ret = sqlite3_prepare_v2(dbh, buf, -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: insert statement prepare failed: %s",
+			__func__, sqlite3_errmsg(dbh));
+		return ret;
+	}
+
+	ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen,
+				SQLITE_STATIC);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: bind blob failed: %s", __func__,
+				sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	if (princhashlen > 0) {
+		ret = sqlite3_bind_blob(stmt, 2, (const void *)clprinchash, princhashlen,
+					SQLITE_STATIC);
+		if (ret != SQLITE_OK) {
+			xlog(L_ERROR, "%s: bind blob failed: %s", __func__,
+					sqlite3_errmsg(dbh));
+			goto out_err;
+		}
+	}
+
+	ret = sqlite3_step(stmt);
+	if (ret == SQLITE_DONE)
+		ret = SQLITE_OK;
+	else
+		xlog(L_ERROR, "%s: unexpected return code from insert: %s",
+				__func__, sqlite3_errmsg(dbh));
+
+out_err:
+	xlog(D_GENERAL, "%s: returning %d", __func__, ret);
+	sqlite3_finalize(stmt);
+	return ret;
+}
+#else
+int
+sqlite_insert_client_and_princhash(const unsigned char *clname, const size_t namelen,
+		const unsigned char *clprinchash, const size_t princhashlen)
+{
+	return -EINVAL;
+}
+#endif
+
+/* Remove a client record */
+int
+sqlite_remove_client(const unsigned char *clname, const size_t namelen)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+
+	ret = snprintf(buf, sizeof(buf), "DELETE FROM \"rec-%016" PRIx64 "\" "
+				"WHERE id==?;", current_epoch);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		return ret;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		return -EINVAL;
+	}
+
+	ret = sqlite3_prepare_v2(dbh, buf, -1, &stmt, NULL);
+
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: statement prepare failed: %s",
+				__func__, sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen,
+				SQLITE_STATIC);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: bind blob failed: %s", __func__,
+				sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_step(stmt);
+	if (ret == SQLITE_DONE)
+		ret = SQLITE_OK;
+	else
+		xlog(L_ERROR, "%s: unexpected return code from delete: %d",
+				__func__, ret);
+
+out_err:
+	xlog(D_GENERAL, "%s: returning %d", __func__, ret);
+	sqlite3_finalize(stmt);
+	return ret;
+}
+
+/*
+ * Is the given clname in the clients table? If so, then update its timestamp
+ * and return success. If the record isn't present, or the update fails, then
+ * return an error.
+ */
+int
+sqlite_check_client(const unsigned char *clname, const size_t namelen)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+
+	ret = snprintf(buf, sizeof(buf), "SELECT count(*) FROM  \"rec-%016" PRIx64 "\" "
+				"WHERE id==?;", recovery_epoch);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		return ret;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		return -EINVAL;
+	}
+
+	ret = sqlite3_prepare_v2(dbh, buf, -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: select statement prepare failed: %s",
+			__func__, sqlite3_errmsg(dbh));
+		return ret;
+	}
+
+	ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen,
+				SQLITE_STATIC);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: bind blob failed: %s",
+				__func__, sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_step(stmt);
+	if (ret != SQLITE_ROW) {
+		xlog(L_ERROR, "%s: unexpected return code from select: %d",
+				__func__, ret);
+		goto out_err;
+	}
+
+	ret = sqlite3_column_int(stmt, 0);
+	xlog(D_GENERAL, "%s: select returned %d rows", __func__, ret);
+	if (ret != 1) {
+		ret = -EACCES;
+		goto out_err;
+	}
+
+	sqlite3_finalize(stmt);
+
+	/* Now insert the client into the table for the current epoch */
+	return sqlite_insert_client(clname, namelen);
+
+out_err:
+	xlog(D_GENERAL, "%s: returning %d", __func__, ret);
+	sqlite3_finalize(stmt);
+	return ret;
+}
+
+int
+sqlite_grace_start(void)
+{
+	int ret, ret2;
+	char *err;
+	uint64_t tcur = current_epoch;
+	uint64_t trec = recovery_epoch;
+
+	/* begin transaction */
+	ret = sqlite3_exec(dbh, "BEGIN EXCLUSIVE TRANSACTION;", NULL, NULL,
+				&err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to begin transaction: %s", err);
+		goto rollback;
+	}
+
+	if (trec == 0) {
+		/*
+		 * A normal grace start - update the epoch values in the grace
+		 * table and create a new table for the current reboot epoch.
+		 */
+		trec = tcur;
+		tcur++;
+
+		ret = snprintf(buf, sizeof(buf), "UPDATE grace "
+				"SET current = %" PRId64 ", recovery = %" PRId64 ";",
+				(int64_t)tcur, (int64_t)trec);
+		if (ret < 0) {
+			xlog(L_ERROR, "sprintf failed!");
+			goto rollback;
+		} else if ((size_t)ret >= sizeof(buf)) {
+			xlog(L_ERROR, "sprintf output too long! (%d chars)",
+				ret);
+			ret = -EINVAL;
+			goto rollback;
+		}
+
+		ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
+		if (ret != SQLITE_OK) {
+			xlog(L_ERROR, "Unable to update epochs: %s", err);
+			goto rollback;
+		}
+
+		ret = snprintf(buf, sizeof(buf), "CREATE TABLE \"rec-%016" PRIx64 "\" "
+				"(id BLOB PRIMARY KEY, princhash blob);",
+				tcur);
+		if (ret < 0) {
+			xlog(L_ERROR, "sprintf failed!");
+			goto rollback;
+		} else if ((size_t)ret >= sizeof(buf)) {
+			xlog(L_ERROR, "sprintf output too long! (%d chars)",
+				ret);
+			ret = -EINVAL;
+			goto rollback;
+		}
+
+		ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
+		if (ret != SQLITE_OK) {
+			xlog(L_ERROR, "Unable to create table for current epoch: %s",
+				err);
+			goto rollback;
+		}
+	} else {
+		/* Server restarted while in grace - don't update the epoch
+		 * values in the grace table, just clear out the records for
+		 * the current reboot epoch.
+		 */
+		ret = snprintf(buf, sizeof(buf), "DELETE FROM \"rec-%016" PRIx64 "\";",
+				tcur);
+		if (ret < 0) {
+			xlog(L_ERROR, "sprintf failed!");
+			goto rollback;
+		} else if ((size_t)ret >= sizeof(buf)) {
+			xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+			ret = -EINVAL;
+			goto rollback;
+		}
+
+		ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
+		if (ret != SQLITE_OK) {
+			xlog(L_ERROR, "Unable to clear table for current epoch: %s",
+				err);
+			goto rollback;
+		}
+	}
+
+	ret = sqlite3_exec(dbh, "COMMIT TRANSACTION;", NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to commit transaction: %s", err);
+		goto rollback;
+	}
+
+	current_epoch = tcur;
+	recovery_epoch = trec;
+	xlog(D_GENERAL, "%s: current_epoch=%"PRIu64" recovery_epoch=%"PRIu64,
+		__func__, current_epoch, recovery_epoch);
+
+out:
+	sqlite3_free(err);
+	return ret;
+rollback:
+	ret2 = sqlite3_exec(dbh, "ROLLBACK TRANSACTION;", NULL, NULL, &err);
+	if (ret2 != SQLITE_OK)
+		xlog(L_ERROR, "Unable to rollback transaction: %s", err);
+	goto out;
+}
+
+int
+sqlite_grace_done(void)
+{
+	int ret, ret2;
+	char *err;
+
+	/* begin transaction */
+	ret = sqlite3_exec(dbh, "BEGIN EXCLUSIVE TRANSACTION;", NULL, NULL,
+				&err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to begin transaction: %s", err);
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, "UPDATE grace SET recovery = \"0\";",
+			NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to clear recovery epoch: %s", err);
+		goto rollback;
+	}
+
+	ret = snprintf(buf, sizeof(buf), "DROP TABLE \"rec-%016" PRIx64 "\";",
+		recovery_epoch);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		goto rollback;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		ret = -EINVAL;
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to drop table for recovery epoch: %s",
+			err);
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, "COMMIT TRANSACTION;", NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to commit transaction: %s", err);
+		goto rollback;
+	}
+
+	recovery_epoch = 0;
+	xlog(D_GENERAL, "%s: current_epoch=%"PRIu64" recovery_epoch=%"PRIu64,
+		__func__, current_epoch, recovery_epoch);
+
+out:
+	sqlite3_free(err);
+	return ret;
+rollback:
+	ret2 = sqlite3_exec(dbh, "ROLLBACK TRANSACTION;", NULL, NULL, &err);
+	if (ret2 != SQLITE_OK)
+		xlog(L_ERROR, "Unable to rollback transaction: %s", err);
+	goto out;
+}
+
+
+int
+sqlite_iterate_recovery(int (*cb)(struct cld_client *clnt), struct cld_client *clnt)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+#if UPCALL_VERSION >= 2
+	struct cld_msg_v2 *cmsg = &clnt->cl_u.cl_msg_v2;
+#else
+	struct cld_msg *cmsg = &clnt->cl_u.cl_msg;
+#endif
+
+	if (recovery_epoch == 0) {
+		xlog(D_GENERAL, "%s: not in grace!", __func__);
+		return -EINVAL;
+	}
+
+	ret = snprintf(buf, sizeof(buf), "SELECT * FROM \"rec-%016" PRIx64 "\";",
+		recovery_epoch);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		return ret;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		return -EINVAL;
+	}
+
+	ret = sqlite3_prepare_v2(dbh, buf, -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: select statement prepare failed: %s",
+			__func__, sqlite3_errmsg(dbh));
+		return ret;
+	}
+
+	while ((ret = sqlite3_step(stmt)) == SQLITE_ROW) {
+		const void *id;
+		int id_len;
+
+		id = sqlite3_column_blob(stmt, 0);
+		id_len = sqlite3_column_bytes(stmt, 0);
+		if (id_len > NFS4_OPAQUE_LIMIT)
+			id_len = NFS4_OPAQUE_LIMIT;
+
+		memset(&cmsg->cm_u, 0, sizeof(cmsg->cm_u));
+#if UPCALL_VERSION >= 2
+		memcpy(&cmsg->cm_u.cm_clntinfo.cc_name.cn_id, id, id_len);
+		cmsg->cm_u.cm_clntinfo.cc_name.cn_len = id_len;
+		if (sqlite3_column_bytes(stmt, 1) > 0) {
+			memcpy(&cmsg->cm_u.cm_clntinfo.cc_princhash.cp_data,
+				sqlite3_column_blob(stmt, 1), SHA256_DIGEST_SIZE);
+			cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = sqlite3_column_bytes(stmt, 1);
+		}
+#else
+		memcpy(&cmsg->cm_u.cm_name.cn_id, id, id_len);
+		cmsg->cm_u.cm_name.cn_len = id_len;
+#endif
+		cb(clnt);
+	}
+	if (ret == SQLITE_DONE)
+		ret = 0;
+	sqlite3_finalize(stmt);
+	return ret;
+}
+
+/*
+ * Cleans out the old nfsdcltrack database.
+ *
+ * Called upon receipt of the first "GraceDone" upcall only.
+ */
+int
+sqlite_delete_cltrack_records(void)
+{
+	int ret;
+	char *s;
+	char *err = NULL;
+
+	s = conf_get_str("nfsdcltrack", "storagedir");
+	if (s)
+		cltrack_storagedir = s;
+	ret = sqlite_attach_db(cltrack_storagedir);
+	if (ret)
+		goto out;
+	ret = sqlite3_exec(dbh, "DELETE FROM attached.clients;",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to clear records from cltrack db: %s",
+				err);
+	}
+	sqlite_detach_db();
+out:
+	sqlite3_free(err);
+	return ret;
+}
+
+/*
+ * Sets first_time to 0 in the parameters table to ensure we only
+ * copy old client tracking records into the database one time.
+ *
+ * Called upon receipt of the first "GraceDone" upcall only.
+ */
+int
+sqlite_first_time_done(void)
+{
+	int ret;
+	char *err = NULL;
+
+	ret = sqlite3_exec(dbh, "UPDATE parameters SET value = \"0\" "
+				"WHERE key = \"first_time\";",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK)
+		xlog(L_ERROR, "Unable to clear first_time: %s", err);
+
+	sqlite3_free(err);
+	return ret;
+}
+
+/*
+ * Closes all sqlite3 resources and shuts down the library.
+ *
+ */
+void
+sqlite_shutdown(void)
+{
+	if (dbh != NULL) {
+		sqlite3_close(dbh);
+		dbh = NULL;
+	}
+
+	sqlite3_shutdown();
+}
diff --git a/utils/nfsdcld/sqlite.h b/utils/nfsdcld/sqlite.h
new file mode 100644
index 0000000..044236c
--- /dev/null
+++ b/utils/nfsdcld/sqlite.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2011  Red Hat, Jeff Layton <jlayton@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef _SQLITE_H_
+#define _SQLITE_H_
+
+struct cld_client;
+
+int sqlite_prepare_dbh(const char *topdir);
+int sqlite_insert_client(const unsigned char *clname, const size_t namelen);
+int sqlite_insert_client_and_princhash(const unsigned char *clname, const size_t namelen,
+		const unsigned char *clprinchash, const size_t princhashlen);
+int sqlite_remove_client(const unsigned char *clname, const size_t namelen);
+int sqlite_check_client(const unsigned char *clname, const size_t namelen);
+int sqlite_grace_start(void);
+int sqlite_grace_done(void);
+int sqlite_iterate_recovery(int (*cb)(struct cld_client *clnt), struct cld_client *clnt);
+int sqlite_delete_cltrack_records(void);
+int sqlite_first_time_done(void);
+
+void sqlite_shutdown(void);
+#endif /* _SQLITE_H */
diff --git a/utils/nfsdcltrack/Makefile.am b/utils/nfsdcltrack/Makefile.am
new file mode 100644
index 0000000..769e4a4
--- /dev/null
+++ b/utils/nfsdcltrack/Makefile.am
@@ -0,0 +1,22 @@
+## Process this file with automake to produce Makefile.in
+
+# These binaries go in /sbin (not /usr/sbin) as the kernel "knows" the
+# /sbin name.  If /sbin is a symlink, CONFIG_SBIN_OVERRIDE can be
+# disabled to install in /usr/sbin anyway.
+# Note that we don't use "if CONFIG_SBIN_OVERRIDE" as that
+# causes autotools to notice the override and disable it.
+@CONFIG_SBIN_OVERRIDE_TRUE@sbindir = /sbin
+
+man8_MANS	= nfsdcltrack.man
+EXTRA_DIST	= $(man8_MANS)
+
+AM_CFLAGS	+= -D_LARGEFILE64_SOURCE
+sbin_PROGRAMS	= nfsdcltrack
+
+noinst_HEADERS	= sqlite.h
+
+nfsdcltrack_SOURCES = nfsdcltrack.c sqlite.c
+nfsdcltrack_LDADD = ../../support/nfs/libnfs.la $(LIBSQLITE) $(LIBCAP)
+
+MAINTAINERCLEANFILES = Makefile.in
+
diff --git a/utils/nfsdcltrack/Makefile.in b/utils/nfsdcltrack/Makefile.in
new file mode 100644
index 0000000..30836c8
--- /dev/null
+++ b/utils/nfsdcltrack/Makefile.in
@@ -0,0 +1,823 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
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+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
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+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
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+  if $(am__is_gnu_make); then \
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+  test $$has_opt = yes
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+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
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+host_triplet = @host@
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+	$(am__DIST_COMMON)
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+am__installdirs = "$(DESTDIR)$(sbindir)" "$(DESTDIR)$(man8dir)"
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+	$(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1)
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+	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
+LTCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) \
+	$(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
+	$(AM_CFLAGS) $(CFLAGS)
+AM_V_CC = $(am__v_CC_@AM_V@)
+am__v_CC_ = $(am__v_CC_@AM_DEFAULT_V@)
+am__v_CC_0 = @echo "  CC      " $@;
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+CCLD = $(CC)
+LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
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+	$(AM_LDFLAGS) $(LDFLAGS) -o $@
+AM_V_CCLD = $(am__v_CCLD_@AM_V@)
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+am__v_CCLD_0 = @echo "  CCLD    " $@;
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+SOURCES = $(nfsdcltrack_SOURCES)
+DIST_SOURCES = $(nfsdcltrack_SOURCES)
+am__can_run_installinfo = \
+  case $$AM_UPDATE_INFO_DIR in \
+    n|no|NO) false;; \
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+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 $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-sbinPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/nfsdcltrack.Po
+	-rm -f ./$(DEPDIR)/sqlite.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am: install-man
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am: install-sbinPROGRAMS
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man: install-man8
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/nfsdcltrack.Po
+	-rm -f ./$(DEPDIR)/sqlite.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: uninstall-man uninstall-sbinPROGRAMS
+
+uninstall-man: uninstall-man8
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-sbinPROGRAMS 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-man8 install-pdf \
+	install-pdf-am install-ps install-ps-am install-sbinPROGRAMS \
+	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 \
+	uninstall-man uninstall-man8 uninstall-sbinPROGRAMS
+
+.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/utils/nfsdcltrack/nfsdcltrack.c b/utils/nfsdcltrack/nfsdcltrack.c
new file mode 100644
index 0000000..7c1c4bc
--- /dev/null
+++ b/utils/nfsdcltrack/nfsdcltrack.c
@@ -0,0 +1,639 @@
+/*
+ * nfsdcltrack.c -- NFSv4 client name tracking program
+ *
+ * Copyright (C) 2012 Jeff Layton <jlayton@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <getopt.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <libgen.h>
+#include <sys/inotify.h>
+#include <dirent.h>
+#include <limits.h>
+#ifdef HAVE_SYS_CAPABILITY_H
+#include <sys/prctl.h>
+#include <sys/capability.h>
+#endif
+
+#include "conffile.h"
+#include "xlog.h"
+#include "sqlite.h"
+
+#ifndef CLD_DEFAULT_STORAGEDIR
+#define CLD_DEFAULT_STORAGEDIR NFS_STATEDIR "/nfsdcltrack"
+#endif
+
+#define NFSD_END_GRACE_FILE "/proc/fs/nfsd/v4_end_grace"
+
+/* defined by RFC 3530 */
+#define NFS4_OPAQUE_LIMIT	1024
+
+/* private data structures */
+struct cltrack_cmd {
+	char *name;
+	bool needs_arg;
+	int (*func)(const char *arg);
+};
+
+/* forward declarations */
+static int cltrack_init(const char *unused);
+static int cltrack_create(const char *id);
+static int cltrack_remove(const char *id);
+static int cltrack_check(const char *id);
+static int cltrack_gracedone(const char *gracetime);
+
+/* global variables */
+static struct option longopts[] =
+{
+	{ "help", 0, NULL, 'h' },
+	{ "debug", 0, NULL, 'd' },
+	{ "foreground", 0, NULL, 'f' },
+	{ "storagedir", 1, NULL, 's' },
+	{ NULL, 0, 0, 0 },
+};
+
+static struct cltrack_cmd commands[] =
+{
+	{ "init", false, cltrack_init },
+	{ "create", true, cltrack_create },
+	{ "remove", true, cltrack_remove },
+	{ "check", true, cltrack_check },
+	{ "gracedone", true, cltrack_gracedone },
+	{ NULL, false, NULL },
+};
+
+static char *storagedir = CLD_DEFAULT_STORAGEDIR;
+
+/* common buffer for holding id4 blobs */
+static unsigned char blob[NFS4_OPAQUE_LIMIT];
+
+static void
+usage(char *progname)
+{
+	printf("Usage: %s [ -hfd ] [ -s dir ] < cmd > < arg >\n", progname);
+	printf("Where < cmd > is one of the following and takes the following < arg >:\n");
+	printf("    init\n");
+	printf("    create <nfs_client_id4>\n");
+	printf("    remove <nfs_client_id4>\n");
+	printf("    check  <nfs_client_id4>\n");
+	printf("    gracedone <epoch time>\n");
+}
+
+
+/**
+ * hex_to_bin - convert a hex digit to its real value
+ * @ch: ascii character represents hex digit
+ *
+ * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad
+ * input.
+ *
+ * Note: borrowed from lib/hexdump.c in the Linux kernel sources.
+ */
+static int
+hex_to_bin(char ch)
+{
+	if ((ch >= '0') && (ch <= '9'))
+		return ch - '0';
+	ch = tolower(ch);
+	if ((ch >= 'a') && (ch <= 'f'))
+		return ch - 'a' + 10;
+	return -1;
+}
+
+/**
+ * hex_str_to_bin - convert a hexidecimal string into a binary blob
+ *
+ * @src: string of hex digit pairs
+ * @dst: destination buffer to hold binary data
+ * @dstsize: size of the destination buffer
+ *
+ * Walk a string of hex digit pairs and convert them into binary data. Returns
+ * the resulting length of the binary data or a negative error code. If the
+ * data will not fit in the buffer, it returns -ENOBUFS (but will likely have
+ * clobbered the dst buffer in the process of determining that). If there are
+ * non-hexidecimal characters in the src, or an odd number of them then it
+ * returns -EINVAL.
+ */
+static ssize_t
+hex_str_to_bin(const char *src, unsigned char *dst, ssize_t dstsize)
+{
+	unsigned char *tmpdst = dst;
+
+	while (*src) {
+		int hi, lo;
+
+		/* make sure we don't overrun the dst buffer */
+		if ((tmpdst - dst) >= dstsize)
+			return -ENOBUFS;
+
+		hi = hex_to_bin(*src++);
+
+		/* did we get an odd number of characters? */
+		if (!*src)
+			return -EINVAL;
+		lo = hex_to_bin(*src++);
+
+		/* one of the characters isn't a hex digit */
+		if (hi < 0 || lo < 0)
+			return -EINVAL;
+
+		/* now place it in the dst buffer */
+		*tmpdst++ = (hi << 4) | lo;
+	}
+
+	return (ssize_t)(tmpdst - dst);
+}
+
+/*
+ * This program will almost always be run with root privileges since the
+ * kernel will call out to run it. Drop all capabilities prior to doing
+ * anything important to limit the exposure to potential compromise.
+ *
+ * FIXME: should we setuid to a different user early on instead?
+ */
+static int
+cltrack_set_caps(void)
+{
+	int ret = 0;
+#ifdef HAVE_SYS_CAPABILITY_H
+	unsigned long i;
+	cap_t caps;
+
+	/* prune the bounding set to nothing */
+	for (i = 0; prctl(PR_CAPBSET_READ, i, 0, 0, 0) >= 0 ; ++i) {
+		ret = prctl(PR_CAPBSET_DROP, i, 0, 0, 0);
+		if (ret) {
+			xlog(L_ERROR, "Unable to prune capability %lu from "
+				      "bounding set: %m", i);
+			return -errno;
+		}
+	}
+
+	/* get a blank capset */
+	caps = cap_init();
+	if (caps == NULL) {
+		xlog(L_ERROR, "Unable to get blank capability set: %m");
+		return -errno;
+	}
+
+	/* reset the process capabilities */
+	if (cap_set_proc(caps) != 0) {
+		xlog(L_ERROR, "Unable to set process capabilities: %m");
+		ret = -errno;
+	}
+	cap_free(caps);
+#endif
+	return ret;
+}
+
+/* Inform the kernel that it's OK to lift nfsd's grace period */
+static void
+cltrack_lift_grace_period(void)
+{
+	int fd;
+
+	fd = open(NFSD_END_GRACE_FILE, O_WRONLY);
+	if (fd < 0) {
+		/* Don't warn if file isn't present */
+		if (errno != ENOENT)
+			xlog(L_WARNING, "Unable to open %s: %m",
+				NFSD_END_GRACE_FILE);
+		return;
+	}
+
+	if (write(fd, "Y", 1) < 0)
+		xlog(L_WARNING, "Unable to write to %s: %m",
+				NFSD_END_GRACE_FILE);
+
+	close(fd);
+	return;
+}
+
+/*
+ * Fetch the contents of the NFSDCLTRACK_GRACE_START env var. If it's not set
+ * or there's an error converting it to time_t, then return LONG_MAX.
+ */
+static time_t
+cltrack_get_grace_start(void)
+{
+	time_t grace_start;
+	char *end;
+	char *grace_start_str = getenv("NFSDCLTRACK_GRACE_START");
+
+	if (!grace_start_str)
+		return LONG_MAX;
+
+	errno = 0;
+	grace_start = strtol(grace_start_str, &end, 0);
+	/* Problem converting or value is too large? */
+	if (errno)
+		return LONG_MAX;
+
+	return grace_start;
+}
+
+static bool
+cltrack_reclaims_complete(void)
+{
+	time_t grace_start = cltrack_get_grace_start();
+
+	/* Don't query DB if we didn't get a valid boot time */
+	if (grace_start == LONG_MAX)
+		return false;
+
+	return !sqlite_query_reclaiming(grace_start);
+}
+
+static int
+cltrack_init(const char __attribute__((unused)) *unused)
+{
+	int ret;
+
+	/*
+	 * see if the storagedir is writable by root w/o CAP_DAC_OVERRIDE.
+	 * If it isn't then give the user a warning but proceed as if
+	 * everything is OK. If the DB has already been created, then
+	 * everything might still work. If it doesn't exist at all, then
+	 * assume that the maindb init will be able to create it. Fail on
+	 * anything else.
+	 */
+	if (access(storagedir, W_OK) == -1) {
+		switch (errno) {
+		case EACCES:
+			xlog(L_WARNING, "Storage directory %s is not writable. "
+					"Should be owned by root and writable "
+					"by owner!", storagedir);
+			break;
+		case ENOENT:
+			/* ignore and assume that we can create dir as root */
+			break;
+		default:
+			xlog(L_ERROR, "Unexpected error when checking access "
+				      "on %s: %m", storagedir);
+			return -errno;
+		}
+	}
+
+	/* set up storage db */
+	ret = sqlite_prepare_dbh(storagedir);
+	if (ret) {
+		xlog(L_ERROR, "Failed to init database: %d", ret);
+		/*
+		 * Convert any error here into -EACCES. It's not truly
+		 * accurate in all cases, but it should cause the kernel to
+		 * stop upcalling until the problem is resolved.
+		 */
+		ret = -EACCES;
+	} else {
+		if (cltrack_reclaims_complete())
+			cltrack_lift_grace_period();
+	}
+
+	return ret;
+}
+
+/*
+ * Fetch the contents of the NFSDCLTRACK_CLIENT_HAS_SESSION env var. If
+ * it's set and the first character is 'Y' then return true. Otherwise
+ * return false.
+ */
+static bool
+cltrack_client_has_session(void)
+{
+	char *has_session = getenv("NFSDCLTRACK_CLIENT_HAS_SESSION");
+
+	if (has_session && *has_session == 'Y')
+		return true;
+
+	return false;
+}
+
+static int
+cltrack_create(const char *id)
+{
+	int ret;
+	ssize_t len;
+	bool has_session;
+
+	xlog(D_GENERAL, "%s: create client record.", __func__);
+
+	ret = sqlite_prepare_dbh(storagedir);
+	if (ret)
+		return ret;
+
+	len = hex_str_to_bin(id, blob, sizeof(blob));
+	if (len < 0)
+		return (int)len;
+
+	has_session = cltrack_client_has_session();
+
+	ret = sqlite_insert_client(blob, len, has_session, false);
+
+	if (!ret && has_session && cltrack_reclaims_complete())
+		cltrack_lift_grace_period();
+
+	return ret ? -EREMOTEIO : ret;
+}
+
+static int
+cltrack_remove(const char *id)
+{
+	int ret;
+	ssize_t len;
+
+	xlog(D_GENERAL, "%s: remove client record.", __func__);
+
+	ret = sqlite_prepare_dbh(storagedir);
+	if (ret)
+		return ret;
+
+	len = hex_str_to_bin(id, blob, sizeof(blob));
+	if (len < 0)
+		return (int)len;
+
+	ret = sqlite_remove_client(blob, len);
+
+	return ret ? -EREMOTEIO : ret;
+}
+
+static int
+cltrack_check_legacy(const unsigned char *blob, const ssize_t len,
+			bool has_session)
+{
+	int ret;
+	struct stat st;
+	char *recdir = getenv("NFSDCLTRACK_LEGACY_RECDIR");
+
+	if (!recdir) {
+		xlog(D_GENERAL, "No NFSDCLTRACK_LEGACY_RECDIR env var");
+		return -EOPNOTSUPP;
+	}
+
+	/* fail recovery on any stat failure */
+	ret = stat(recdir, &st);
+	if (ret) {
+		xlog(D_GENERAL, "Unable to stat %s: %d", recdir, errno);
+		return -errno;
+	}
+
+	/* fail if it isn't a directory */
+	if (!S_ISDIR(st.st_mode)) {
+		xlog(D_GENERAL, "%s is not a directory: mode=0%o", recdir
+				, st.st_mode);
+		return -ENOTDIR;
+	}
+
+	/* Dir exists, try to insert record into db */
+	ret = sqlite_insert_client(blob, len, has_session, has_session);
+	if (ret) {
+		xlog(D_GENERAL, "Failed to insert client: %d", ret);
+		return -EREMOTEIO;
+	}
+
+	/* remove the legacy recoverydir */
+	ret = rmdir(recdir);
+	if (ret) {
+		xlog(D_GENERAL, "Failed to rmdir %s: %d", recdir, errno);
+		return -errno;
+	}
+	return 0;
+}
+
+static int
+cltrack_check(const char *id)
+{
+	int ret;
+	ssize_t len;
+	bool has_session;
+
+	xlog(D_GENERAL, "%s: check client record", __func__);
+
+	ret = sqlite_prepare_dbh(storagedir);
+	if (ret)
+		return ret;
+
+	len = hex_str_to_bin(id, blob, sizeof(blob));
+	if (len < 0)
+		return (int)len;
+
+	has_session = cltrack_client_has_session();
+
+	ret = sqlite_check_client(blob, len, has_session);
+	if (ret)
+		ret = cltrack_check_legacy(blob, len, has_session);
+
+	return ret ? -EPERM : ret;
+}
+
+/* Clean out the v4recoverydir -- best effort here */
+static void
+cltrack_legacy_gracedone(void)
+{
+	DIR *v4recovery;
+	struct dirent *entry;
+	char *dirname = getenv("NFSDCLTRACK_LEGACY_TOPDIR");
+
+	if (!dirname)
+		return;
+
+	v4recovery = opendir(dirname);
+	if (!v4recovery)
+		return;
+
+	while ((entry = readdir(v4recovery))) {
+		int len;
+
+		/* skip "." and ".." */
+		if (entry->d_name[0] == '.') {
+			switch (entry->d_name[1]) {
+			case '\0':
+				continue;
+			case '.':
+				if (entry->d_name[2] == '\0')
+					continue;
+			}
+		}
+
+		/* borrow the clientid blob for this */
+		len = snprintf((char *)blob, sizeof(blob), "%s/%s", dirname,
+				entry->d_name);
+
+		/* if there's a problem, then skip this entry */
+		if (len < 0 || (size_t)len >= sizeof(blob)) {
+			xlog(L_WARNING, "%s: unable to build filename for %s!",
+				__func__, entry->d_name);
+			continue;
+		}
+
+		len = rmdir((char *)blob);
+		if (len)
+			xlog(L_WARNING, "%s: unable to rmdir %s: %d", __func__,
+				(char *)blob, len);
+	}
+
+	closedir(v4recovery);
+}
+
+static int
+cltrack_gracedone(const char *timestr)
+{
+	int ret;
+	char *tail;
+	uint64_t gracetime;
+
+
+	ret = sqlite_prepare_dbh(storagedir);
+	if (ret)
+		return ret;
+
+	errno = 0;
+	gracetime = strtol(timestr, &tail, 0);
+
+	/* did the resulting value overflow? (Probably -ERANGE here) */
+	if (errno)
+		return -errno;
+
+	/* string wasn't fully converted */
+	if (*tail)
+		return -EINVAL;
+
+	xlog(D_GENERAL, "%s: grace done. gracetime=%"PRIu64, __func__, gracetime);
+
+	ret = sqlite_remove_unreclaimed(gracetime);
+
+	cltrack_legacy_gracedone();
+
+	return ret ? -EREMOTEIO : ret;
+}
+
+static struct cltrack_cmd *
+find_cmd(char *cmdname)
+{
+	struct cltrack_cmd *current = &commands[0];
+
+	while (current->name) {
+		if (!strcmp(cmdname, current->name))
+			return current;
+		++current;
+	}
+
+	xlog(L_ERROR, "%s: '%s' doesn't match any known command",
+			__func__, cmdname);
+	return NULL;
+}
+inline static void 
+read_nfsdcltrack_conf(void)
+{
+	char *val;
+
+	conf_init_file(NFS_CONFFILE); 
+	xlog_set_debug("nfsdcltrack");
+	val = conf_get_str("nfsdcltrack", "storagedir");
+	if (val)
+		storagedir = val;
+}
+int
+main(int argc, char **argv)
+{
+	int arg;
+	int rc = 0;
+	char *progname, *cmdarg = NULL;
+	struct cltrack_cmd *cmd;
+
+	progname = basename(argv[0]);
+
+	xlog_syslog(1);
+	xlog_stderr(0);
+
+	/* Read in config setting */
+	read_nfsdcltrack_conf();
+
+	/* process command-line options */
+	while ((arg = getopt_long(argc, argv, "hdfs:", longopts,
+				  NULL)) != EOF) {
+		switch (arg) {
+		case 'd':
+			xlog_config(D_ALL, 1);
+			break;
+		case 'f':
+			xlog_syslog(0);
+			xlog_stderr(1);
+			break;
+		case 's':
+			storagedir = optarg;
+			break;
+		default:
+			usage(progname);
+			return 1;
+		}
+	}
+
+	xlog_open(progname);
+
+	/* we expect a command, at least */
+	if (optind >= argc) {
+		xlog(L_ERROR, "Missing command name\n");
+		rc = -EINVAL;
+		goto out;
+	}
+
+	/* drop all capabilities */
+	rc = cltrack_set_caps();
+	if (rc)
+		goto out;
+
+	cmd = find_cmd(argv[optind]);
+	if (!cmd) {
+		/*
+		 * In the event that we get a command that we don't understand
+		 * then return a distinct error. The kernel can use this to
+		 * determine a new kernel/old userspace situation and cope
+		 * with it.
+		 */
+		rc = -ENOSYS;
+		goto out;
+	}
+
+	/* populate arg var if command needs it */
+	if (cmd->needs_arg) {
+		if (optind + 1 >= argc) {
+			xlog(L_ERROR, "Command %s requires an argument\n",
+				cmd->name);
+			rc = -EINVAL;
+			goto out;
+		}
+		cmdarg = argv[optind + 1];
+	}
+	rc = cmd->func(cmdarg);
+out:
+	return rc;
+}
diff --git a/utils/nfsdcltrack/nfsdcltrack.man b/utils/nfsdcltrack/nfsdcltrack.man
new file mode 100644
index 0000000..cc24b7a
--- /dev/null
+++ b/utils/nfsdcltrack/nfsdcltrack.man
@@ -0,0 +1,112 @@
+.ie \nF \{\
+.    de IX
+.    tm Index:\\$1\t\\n%\t"\\$2"
+..
+.    nr % 0
+.    rr F
+.\}
+.el \{\
+.    de IX
+..
+.\}
+.IX Title "NFSDCLTRACK 8"
+.TH NFSDCLTRACK 8 "2012-10-24" "" ""
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+nfsdcltrack \- NFSv4 Client Tracking Callout Program
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+nfsdcltrack [\-d] [\-f] [\-s stable storage dir] <command> <args...>
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+nfsdcltrack is the NFSv4 client tracking callout program. It is not necessary
+to install this program on machines that are not acting as NFSv4 servers.
+.PP
+When a network partition is combined with a server reboot, there are
+edge conditions that can cause the server to grant lock reclaims when
+other clients have taken conflicting locks in the interim. A more detailed
+explanation of this issue is described in \s-1RFC\s0 3530, section 8.6.3
+and in \s-1RFC\s0 5661, section 8.4.3.
+.PP
+In order to prevent these problems, the server must track a small amount
+of per-client information on stable storage. This program provides the
+userspace piece of that functionality. When the kernel needs to manipulate
+the database that stores this info, it will execute this program to handle
+it.
+.SH "OPTIONS"
+.IX Header "OPTIONS"
+.IP "\fB\-d\fR, \fB\-\-debug\fR" 4
+.IX Item "-d, --debug"
+Enable debug level logging.
+.IP "\fB\-f\fR, \fB\-\-foreground\fR" 4
+.IX Item "-f, --foreground"
+Log to stderr instead of syslog.
+.IP "\fB\-s\fR \fIstoragedir\fR, \fB\-\-storagedir\fR=\fIstorage_dir\fR" 4
+.IX Item "-s storagedir, --storagedir=storage_dir"
+Directory where stable storage information should be kept. The default
+value is \fI/var/lib/nfs/nfsdcltrack\fR.
+.SH "COMMANDS"
+.IX Header "COMMANDS"
+nfsdcltrack requires a command for each invocation. Supported commands
+are:
+.IP "\fBinit\fR" 4
+.IX Item "init"
+Initialize the database. This command requires no argument.
+.IP "\fBcreate\fR" 4
+.IX Item "create"
+Create a new client record (or update the timestamp on an existing one). This command requires a hex-encoded nfs_client_id4 as an argument.
+.IP "\fBremove\fR" 4
+.IX Item "remove"
+Remove a client record from the database. This command requires a hex-encoded nfs_client_id4 as an argument.
+.IP "\fBcheck\fR" 4
+.IX Item "check"
+Check to see if a nfs_client_id4 is allowed to reclaim. This command requires a hex-encoded nfs_client_id4 as an argument.
+.IP "\fBgracedone\fR" 4
+.IX Item "gracedone"
+Remove any unreclaimed client records from the database. This command requires a epoch boot time as an argument.
+.SH "EXTERNAL CONFIGURATION"
+The directory for stable storage information can be set via the file
+.B /etc/nfs.conf
+by setting the
+.B storagedir
+value in the
+.B nfsdcltrack
+section.  For example:
+.in +5
+[nfsdcltrack]
+.br
+  storagedir = /shared/nfs/nfsdcltrack
+.in -5
+Debuging to syslog can also be enabled by setting "debug = 1" in this file.
+.SH "LEGACY TRANSITION MECHANISM"
+.IX Header "LEGACY TRANSITION MECHANISM"
+The Linux kernel NFSv4 server has historically tracked this information
+on stable storage by manipulating information on the filesystem
+directly, in the directory to which \fI/proc/fs/nfsd/nfsv4recoverydir\fR
+points. If the kernel passes the correct information, then nfsdcltrack
+can use it to allow a seamless transition from the old client tracking
+scheme to the new one.
+.PP
+On a \fBcheck\fR operation, if there is no record of the client in the
+database, nfsdcltrack will look to see if the \fB\s-1NFSDCLTRACK_LEGACY_RECDIR\s0\fR
+environment variable is set. If it is, then it will fetch that value and
+see if a directory exists by that name. If it does, then the check
+operation will succeed and the directory will be removed.
+.PP
+On a \fBgracedone\fR operation, nfsdcltrack will look to see if the
+\&\fB\s-1NFSDCLTRACK_LEGACY_TOPDIR\s0\fR environment variable is set. If it is, then
+it will attempt to clean out that directory prior to exiting.
+.PP
+Note that this transition is one-way. If the machine subsequently reboots
+back into an older kernel that does not support the nfsdcltrack upcall
+then the clients will not be able to recover their state.
+.SH "NOTES"
+.IX Header "NOTES"
+This program requires a kernel that supports the nfsdcltrack usermodehelper
+upcall. This support was first added to mainline kernels in 3.8.
+.SH "AUTHORS"
+.IX Header "AUTHORS"
+nfsdcltrack was developed by Jeff Layton <jlayton@redhat.com>.
diff --git a/utils/nfsdcltrack/sqlite.c b/utils/nfsdcltrack/sqlite.c
new file mode 100644
index 0000000..cf0c6a4
--- /dev/null
+++ b/utils/nfsdcltrack/sqlite.c
@@ -0,0 +1,604 @@
+/*
+ * Copyright (C) 2011  Red Hat, Jeff Layton <jlayton@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+/*
+ * Explanation:
+ *
+ * This file contains the code to manage the sqlite backend database for the
+ * nfsdcltrack usermodehelper upcall program.
+ *
+ * The main database is called main.sqlite and contains the following tables:
+ *
+ * parameters: simple key/value pairs for storing database info
+ *
+ * clients: an "id" column containing a BLOB with the long-form clientid as
+ * 	    sent by the client, a "time" column containing a timestamp (in
+ * 	    epoch seconds) of when the record was last updated, and a
+ * 	    "has_session" column containing a boolean value indicating
+ * 	    whether the client has sessions (v4.1+) or not (v4.0).
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <dirent.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <sqlite3.h>
+#include <linux/limits.h>
+
+#include "xlog.h"
+#include "sqlite.h"
+
+#define CLTRACK_SQLITE_LATEST_SCHEMA_VERSION 2
+
+/* in milliseconds */
+#define CLTRACK_SQLITE_BUSY_TIMEOUT 10000
+
+/* private data structures */
+
+/* global variables */
+
+/* reusable pathname and sql command buffer */
+static char buf[PATH_MAX];
+
+/* global database handle */
+static sqlite3 *dbh;
+
+/* forward declarations */
+
+/* make a directory, ignoring EEXIST errors unless it's not a directory */
+static int
+mkdir_if_not_exist(const char *dirname)
+{
+	int ret;
+	struct stat statbuf;
+
+	ret = mkdir(dirname, S_IRWXU);
+	if (ret && errno != EEXIST)
+		return -errno;
+
+	ret = stat(dirname, &statbuf);
+	if (ret)
+		return -errno;
+
+	if (!S_ISDIR(statbuf.st_mode))
+		ret = -ENOTDIR;
+
+	return ret;
+}
+
+static int
+sqlite_query_schema_version(void)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+
+	/* prepare select query */
+	ret = sqlite3_prepare_v2(dbh,
+		"SELECT value FROM parameters WHERE key == \"version\";",
+		 -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(D_GENERAL, "Unable to prepare select statement: %s",
+			sqlite3_errmsg(dbh));
+		ret = 0;
+		goto out;
+	}
+
+	/* query schema version */
+	ret = sqlite3_step(stmt);
+	if (ret != SQLITE_ROW) {
+		xlog(D_GENERAL, "Select statement execution failed: %s",
+				sqlite3_errmsg(dbh));
+		ret = 0;
+		goto out;
+	}
+
+	ret = sqlite3_column_int(stmt, 0);
+out:
+	sqlite3_finalize(stmt);
+	return ret;
+}
+
+static int
+sqlite_maindb_update_v1_to_v2(void)
+{
+	int ret, ret2;
+	char *err;
+
+	/* begin transaction */
+	ret = sqlite3_exec(dbh, "BEGIN EXCLUSIVE TRANSACTION;", NULL, NULL,
+				&err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to begin transaction: %s", err);
+		goto rollback;
+	}
+
+	/*
+	 * Check schema version again. This time, under an exclusive
+	 * transaction to guard against racing DB setup attempts
+	 */
+	ret = sqlite_query_schema_version();
+	switch (ret) {
+	case 1:
+		/* Still at v1 -- do conversion */
+		break;
+	case CLTRACK_SQLITE_LATEST_SCHEMA_VERSION:
+		/* Someone else raced in and set it up */
+		ret = 0;
+		goto rollback;
+	default:
+		/* Something went wrong -- fail! */
+		ret = -EINVAL;
+		goto rollback;
+	}
+
+	/* create v2 clients table */
+	ret = sqlite3_exec(dbh, "ALTER TABLE clients ADD COLUMN "
+				"has_session INTEGER;",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to update clients table: %s", err);
+		goto rollback;
+	}
+
+	ret = snprintf(buf, sizeof(buf), "UPDATE parameters SET value = %d "
+			"WHERE key = \"version\";",
+			CLTRACK_SQLITE_LATEST_SCHEMA_VERSION);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		goto rollback;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		ret = -EINVAL;
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to update schema version: %s", err);
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, "COMMIT TRANSACTION;", NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to commit transaction: %s", err);
+		goto rollback;
+	}
+out:
+	sqlite3_free(err);
+	return ret;
+rollback:
+	ret2 = sqlite3_exec(dbh, "ROLLBACK TRANSACTION;", NULL, NULL, &err);
+	if (ret2 != SQLITE_OK)
+		xlog(L_ERROR, "Unable to rollback transaction: %s", err);
+	goto out;
+}
+
+/*
+ * Start an exclusive transaction and recheck the DB schema version. If it's
+ * still zero (indicating a new database) then set it up. If that all works,
+ * then insert schema version into the parameters table and commit the
+ * transaction. On any error, rollback the transaction.
+ */
+static int
+sqlite_maindb_init_v2(void)
+{
+	int ret, ret2;
+	char *err = NULL;
+
+	/* Start a transaction */
+	ret = sqlite3_exec(dbh, "BEGIN EXCLUSIVE TRANSACTION;", NULL, NULL,
+				&err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to begin transaction: %s", err);
+		if (err)
+			sqlite3_free(err);
+		return ret;
+	}
+
+	/*
+	 * Check schema version again. This time, under an exclusive
+	 * transaction to guard against racing DB setup attempts
+	 */
+	ret = sqlite_query_schema_version();
+	switch (ret) {
+	case 0:
+		/* Query failed again -- set up DB */
+		break;
+	case CLTRACK_SQLITE_LATEST_SCHEMA_VERSION:
+		/* Someone else raced in and set it up */
+		ret = 0;
+		goto rollback;
+	default:
+		/* Something went wrong -- fail! */
+		ret = -EINVAL;
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, "CREATE TABLE parameters "
+				"(key TEXT PRIMARY KEY, value TEXT);",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to create parameter table: %s", err);
+		goto rollback;
+	}
+
+	/* create the "clients" table */
+	ret = sqlite3_exec(dbh, "CREATE TABLE clients (id BLOB PRIMARY KEY, "
+				"time INTEGER, has_session INTEGER);",
+				NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to create clients table: %s", err);
+		goto rollback;
+	}
+
+
+	/* insert version into parameters table */
+	ret = snprintf(buf, sizeof(buf), "INSERT OR FAIL INTO parameters "
+			"values (\"version\", \"%d\");",
+			CLTRACK_SQLITE_LATEST_SCHEMA_VERSION);
+	if (ret < 0) {
+		xlog(L_ERROR, "sprintf failed!");
+		goto rollback;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		xlog(L_ERROR, "sprintf output too long! (%d chars)", ret);
+		ret = -EINVAL;
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to insert into parameter table: %s", err);
+		goto rollback;
+	}
+
+	ret = sqlite3_exec(dbh, "COMMIT TRANSACTION;", NULL, NULL, &err);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to commit transaction: %s", err);
+		goto rollback;
+	}
+out:
+	sqlite3_free(err);
+	return ret;
+
+rollback:
+	/* Attempt to rollback the transaction */
+	ret2 = sqlite3_exec(dbh, "ROLLBACK TRANSACTION;", NULL, NULL, &err);
+	if (ret2 != SQLITE_OK)
+		xlog(L_ERROR, "Unable to rollback transaction: %s", err);
+	goto out;
+}
+
+/* Open the database and set up the database handle for it */
+int
+sqlite_prepare_dbh(const char *topdir)
+{
+	int ret;
+
+	/* Do nothing if the database handle is already set up */
+	if (dbh)
+		return 0;
+
+	ret = snprintf(buf, PATH_MAX - 1, "%s/main.sqlite", topdir);
+	if (ret < 0)
+		return ret;
+
+	buf[PATH_MAX - 1] = '\0';
+
+	/* open a new DB handle */
+	ret = sqlite3_open(buf, &dbh);
+	if (ret != SQLITE_OK) {
+		/* try to create the dir */
+		ret = mkdir_if_not_exist(topdir);
+		if (ret)
+			goto out_close;
+
+		/* retry open */
+		ret = sqlite3_open(buf, &dbh);
+		if (ret != SQLITE_OK)
+			goto out_close;
+	}
+
+	/* set busy timeout */
+	ret = sqlite3_busy_timeout(dbh, CLTRACK_SQLITE_BUSY_TIMEOUT);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to set sqlite busy timeout: %s",
+				sqlite3_errmsg(dbh));
+		goto out_close;
+	}
+
+	ret = sqlite_query_schema_version();
+	switch (ret) {
+	case CLTRACK_SQLITE_LATEST_SCHEMA_VERSION:
+		/* DB is already set up. Do nothing */
+		ret = 0;
+		break;
+	case 1:
+		/* Old DB -- update to new schema */
+		ret = sqlite_maindb_update_v1_to_v2();
+		if (ret)
+			goto out_close;
+		break;
+	case 0:
+		/* Query failed -- try to set up new DB */
+		ret = sqlite_maindb_init_v2();
+		if (ret)
+			goto out_close;
+		break;
+	default:
+		/* Unknown DB version -- downgrade? Fail */
+		xlog(L_ERROR, "Unsupported database schema version! "
+			"Expected %d, got %d.",
+			CLTRACK_SQLITE_LATEST_SCHEMA_VERSION, ret);
+		ret = -EINVAL;
+		goto out_close;
+	}
+
+	return ret;
+out_close:
+	sqlite3_close(dbh);
+	dbh = NULL;
+	return ret;
+}
+
+/*
+ * Create a client record
+ *
+ * Returns a non-zero sqlite error code, or SQLITE_OK (aka 0)
+ */
+int
+sqlite_insert_client(const unsigned char *clname, const size_t namelen,
+			const bool has_session, const bool zerotime)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+
+	if (zerotime)
+		ret = sqlite3_prepare_v2(dbh, "INSERT OR REPLACE INTO clients "
+				"VALUES (?, 0, ?);", -1, &stmt, NULL);
+	else
+		ret = sqlite3_prepare_v2(dbh, "INSERT OR REPLACE INTO clients "
+				"VALUES (?, strftime('%s', 'now'), ?);", -1,
+				&stmt, NULL);
+
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: insert statement prepare failed: %s",
+			__func__, sqlite3_errmsg(dbh));
+		return ret;
+	}
+
+	ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen,
+				SQLITE_STATIC);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: bind blob failed: %s", __func__,
+				sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_bind_int(stmt, 2, (int)has_session);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: bind int failed: %s", __func__,
+				sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_step(stmt);
+	if (ret == SQLITE_DONE)
+		ret = SQLITE_OK;
+	else
+		xlog(L_ERROR, "%s: unexpected return code from insert: %s",
+				__func__, sqlite3_errmsg(dbh));
+
+out_err:
+	xlog(D_GENERAL, "%s: returning %d", __func__, ret);
+	sqlite3_finalize(stmt);
+	return ret;
+}
+
+/* Remove a client record */
+int
+sqlite_remove_client(const unsigned char *clname, const size_t namelen)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+
+	ret = sqlite3_prepare_v2(dbh, "DELETE FROM clients WHERE id==?", -1,
+				 &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: statement prepare failed: %s",
+				__func__, sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen,
+				SQLITE_STATIC);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: bind blob failed: %s", __func__,
+				sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_step(stmt);
+	if (ret == SQLITE_DONE)
+		ret = SQLITE_OK;
+	else
+		xlog(L_ERROR, "%s: unexpected return code from delete: %d",
+				__func__, ret);
+
+out_err:
+	xlog(D_GENERAL, "%s: returning %d", __func__, ret);
+	sqlite3_finalize(stmt);
+	return ret;
+}
+
+/*
+ * Is the given clname in the clients table? If so, then update its timestamp
+ * and return success. If the record isn't present, or the update fails, then
+ * return an error.
+ */
+int
+sqlite_check_client(const unsigned char *clname, const size_t namelen,
+			const bool has_session)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+
+	ret = sqlite3_prepare_v2(dbh, "SELECT count(*) FROM clients WHERE "
+				      "id==?", -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: unable to prepare update statement: %s",
+				__func__, sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen,
+				SQLITE_STATIC);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: bind blob failed: %s",
+				__func__, sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_step(stmt);
+	if (ret != SQLITE_ROW) {
+		xlog(L_ERROR, "%s: unexpected return code from select: %d",
+				__func__, ret);
+		goto out_err;
+	}
+
+	ret = sqlite3_column_int(stmt, 0);
+	xlog(D_GENERAL, "%s: select returned %d rows", __func__, ret);
+	if (ret != 1) {
+		ret = -EACCES;
+		goto out_err;
+	}
+
+	/* Only update timestamp for v4.0 clients */
+	if (has_session) {
+		ret = SQLITE_OK;
+		goto out_err;
+	}
+
+	sqlite3_finalize(stmt);
+	stmt = NULL;
+	ret = sqlite3_prepare_v2(dbh, "UPDATE OR FAIL clients SET "
+				      "time=strftime('%s', 'now') WHERE id==?",
+				 -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: unable to prepare update statement: %s",
+				__func__, sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen,
+				SQLITE_STATIC);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: bind blob failed: %s",
+				__func__, sqlite3_errmsg(dbh));
+		goto out_err;
+	}
+
+	ret = sqlite3_step(stmt);
+	if (ret == SQLITE_DONE)
+		ret = SQLITE_OK;
+	else
+		xlog(L_ERROR, "%s: unexpected return code from update: %s",
+				__func__, sqlite3_errmsg(dbh));
+
+out_err:
+	xlog(D_GENERAL, "%s: returning %d", __func__, ret);
+	sqlite3_finalize(stmt);
+	return ret;
+}
+
+/*
+ * remove any client records that were not reclaimed since grace_start.
+ */
+int
+sqlite_remove_unreclaimed(uint64_t grace_start)
+{
+	int ret;
+	char *err = NULL;
+
+	ret = snprintf(buf, sizeof(buf), "DELETE FROM clients WHERE time < %"PRIu64,
+			grace_start);
+	if (ret < 0) {
+		return ret;
+	} else if ((size_t)ret >= sizeof(buf)) {
+		ret = -EINVAL;
+		return ret;
+	}
+
+	ret = sqlite3_exec(dbh, buf, NULL, NULL, &err);
+	if (ret != SQLITE_OK)
+		xlog(L_ERROR, "%s: delete failed: %s", __func__, err);
+
+	xlog(D_GENERAL, "%s: returning %d", __func__, ret);
+	sqlite3_free(err);
+	return ret;
+}
+
+/*
+ * Are there any clients that are possibly still reclaiming? Return a positive
+ * integer (usually number of clients) if so. If not, then return 0. On any
+ * error, return non-zero.
+ */
+int
+sqlite_query_reclaiming(const time_t grace_start)
+{
+	int ret;
+	sqlite3_stmt *stmt = NULL;
+
+	ret = sqlite3_prepare_v2(dbh, "SELECT count(*) FROM clients WHERE "
+				      "time < ? OR has_session != 1", -1, &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: unable to prepare select statement: %s",
+				__func__, sqlite3_errmsg(dbh));
+		return ret;
+	}
+
+	ret = sqlite3_bind_int64(stmt, 1, (sqlite3_int64)grace_start);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "%s: bind int64 failed: %s",
+				__func__, sqlite3_errmsg(dbh));
+		return ret;
+	}
+
+	ret = sqlite3_step(stmt);
+	if (ret != SQLITE_ROW) {
+		xlog(L_ERROR, "%s: unexpected return code from select: %s",
+				__func__, sqlite3_errmsg(dbh));
+		return ret;
+	}
+
+	ret = sqlite3_column_int(stmt, 0);
+	sqlite3_finalize(stmt);
+	xlog(D_GENERAL, "%s: there are %d clients that have not completed "
+			"reclaim", __func__, ret);
+	return ret;
+}
diff --git a/utils/nfsdcltrack/sqlite.h b/utils/nfsdcltrack/sqlite.h
new file mode 100644
index 0000000..ba8cdfa
--- /dev/null
+++ b/utils/nfsdcltrack/sqlite.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2011  Red Hat, Jeff Layton <jlayton@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef _SQLITE_H_
+#define _SQLITE_H_
+
+int sqlite_prepare_dbh(const char *topdir);
+int sqlite_insert_client(const unsigned char *clname, const size_t namelen,
+				const bool has_session, const bool zerotime);
+int sqlite_remove_client(const unsigned char *clname, const size_t namelen);
+int sqlite_check_client(const unsigned char *clname, const size_t namelen,
+				const bool has_session);
+int sqlite_remove_unreclaimed(const uint64_t grace_start);
+int sqlite_query_reclaiming(const time_t grace_start);
+
+#endif /* _SQLITE_H */