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

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

7 files changed, 1687 insertions, 0 deletions

diff --git a/support/reexport/Makefile.am b/support/reexport/Makefile.am
new file mode 100644
index 0000000..fbd66a2
--- /dev/null
+++ b/support/reexport/Makefile.am
@@ -0,0 +1,18 @@
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+
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+	      ../../support/nfs/libnfs.la \
+	       $(LIBPTHREAD) $(LIBEVENT) $(LIBSQLITE) \
+	       $(OPTLIBS)
+
+fsidd_CPPFLAGS = $(AM_CPPFLAGS) $(CPPFLAGS) \
+		  -I$(top_builddir)/support/include
+
+MAINTAINERCLEANFILES = Makefile.in
diff --git a/support/reexport/Makefile.in b/support/reexport/Makefile.in
new file mode 100644
index 0000000..51d2424
--- /dev/null
+++ b/support/reexport/Makefile.in
@@ -0,0 +1,799 @@
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+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+
+clean-noinstLIBRARIES:
+	-test -z "$(noinst_LIBRARIES)" || rm -f $(noinst_LIBRARIES)
+
+libreexport.a: $(libreexport_a_OBJECTS) $(libreexport_a_DEPENDENCIES) $(EXTRA_libreexport_a_DEPENDENCIES) 
+	$(AM_V_at)-rm -f libreexport.a
+	$(AM_V_AR)$(libreexport_a_AR) libreexport.a $(libreexport_a_OBJECTS) $(libreexport_a_LIBADD)
+	$(AM_V_at)$(RANLIB) libreexport.a
+
+fsidd$(EXEEXT): $(fsidd_OBJECTS) $(fsidd_DEPENDENCIES) $(EXTRA_fsidd_DEPENDENCIES) 
+	@rm -f fsidd$(EXEEXT)
+	$(AM_V_CCLD)$(LINK) $(fsidd_OBJECTS) $(fsidd_LDADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fsidd-backend_sqlite.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fsidd-fsidd.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/reexport.Po@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ $<
+
+.c.obj:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
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+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
+
+.c.lo:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LTCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
+
+fsidd-fsidd.o: fsidd.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(fsidd_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT fsidd-fsidd.o -MD -MP -MF $(DEPDIR)/fsidd-fsidd.Tpo -c -o fsidd-fsidd.o `test -f 'fsidd.c' || echo '$(srcdir)/'`fsidd.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/fsidd-fsidd.Tpo $(DEPDIR)/fsidd-fsidd.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='fsidd.c' object='fsidd-fsidd.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(fsidd_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o fsidd-fsidd.o `test -f 'fsidd.c' || echo '$(srcdir)/'`fsidd.c
+
+fsidd-fsidd.obj: fsidd.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(fsidd_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT fsidd-fsidd.obj -MD -MP -MF $(DEPDIR)/fsidd-fsidd.Tpo -c -o fsidd-fsidd.obj `if test -f 'fsidd.c'; then $(CYGPATH_W) 'fsidd.c'; else $(CYGPATH_W) '$(srcdir)/fsidd.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/fsidd-fsidd.Tpo $(DEPDIR)/fsidd-fsidd.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='fsidd.c' object='fsidd-fsidd.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(fsidd_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o fsidd-fsidd.obj `if test -f 'fsidd.c'; then $(CYGPATH_W) 'fsidd.c'; else $(CYGPATH_W) '$(srcdir)/fsidd.c'; fi`
+
+fsidd-backend_sqlite.o: backend_sqlite.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(fsidd_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT fsidd-backend_sqlite.o -MD -MP -MF $(DEPDIR)/fsidd-backend_sqlite.Tpo -c -o fsidd-backend_sqlite.o `test -f 'backend_sqlite.c' || echo '$(srcdir)/'`backend_sqlite.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/fsidd-backend_sqlite.Tpo $(DEPDIR)/fsidd-backend_sqlite.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='backend_sqlite.c' object='fsidd-backend_sqlite.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(fsidd_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o fsidd-backend_sqlite.o `test -f 'backend_sqlite.c' || echo '$(srcdir)/'`backend_sqlite.c
+
+fsidd-backend_sqlite.obj: backend_sqlite.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(fsidd_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT fsidd-backend_sqlite.obj -MD -MP -MF $(DEPDIR)/fsidd-backend_sqlite.Tpo -c -o fsidd-backend_sqlite.obj `if test -f 'backend_sqlite.c'; then $(CYGPATH_W) 'backend_sqlite.c'; else $(CYGPATH_W) '$(srcdir)/backend_sqlite.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/fsidd-backend_sqlite.Tpo $(DEPDIR)/fsidd-backend_sqlite.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='backend_sqlite.c' object='fsidd-backend_sqlite.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(fsidd_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o fsidd-backend_sqlite.obj `if test -f 'backend_sqlite.c'; then $(CYGPATH_W) 'backend_sqlite.c'; else $(CYGPATH_W) '$(srcdir)/backend_sqlite.c'; fi`
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-am
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(PROGRAMS) $(LIBRARIES)
+installdirs:
+	for dir in "$(DESTDIR)$(sbindir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
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+uninstall: uninstall-am
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+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLIBRARIES \
+	clean-sbinPROGRAMS mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/fsidd-backend_sqlite.Po
+	-rm -f ./$(DEPDIR)/fsidd-fsidd.Po
+	-rm -f ./$(DEPDIR)/reexport.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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+info-am:
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+install-dvi-am:
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+install-exec-am: install-sbinPROGRAMS
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+install-html: install-html-am
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+install-html-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 ./$(DEPDIR)/fsidd-backend_sqlite.Po
+	-rm -f ./$(DEPDIR)/fsidd-fsidd.Po
+	-rm -f ./$(DEPDIR)/reexport.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
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+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
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+pdf: pdf-am
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+ps: ps-am
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+ps-am:
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+uninstall-am: uninstall-sbinPROGRAMS
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLIBRARIES \
+	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-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-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/support/reexport/backend_sqlite.c b/support/reexport/backend_sqlite.c
new file mode 100644
index 0000000..0eb5ea3
--- /dev/null
+++ b/support/reexport/backend_sqlite.c
@@ -0,0 +1,283 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sqlite3.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifdef HAVE_GETRANDOM
+# include <sys/random.h>
+# if !defined(SYS_getrandom) && defined(__NR_getrandom)
+   /* usable kernel-headers, but old glibc-headers */
+#  define SYS_getrandom __NR_getrandom
+# endif
+#endif
+
+#include "conffile.h"
+#include "reexport_backend.h"
+#include "xlog.h"
+
+#define REEXPDB_DBFILE NFS_STATEDIR "/reexpdb.sqlite3"
+#define REEXPDB_DBFILE_WAIT_USEC (5000)
+
+static sqlite3 *db;
+static int init_done;
+
+#if !defined(HAVE_GETRANDOM) && defined(SYS_getrandom)
+/* libc without function, but we have syscall */
+static int getrandom(void *buf, size_t buflen, unsigned int flags)
+{
+	return (syscall(SYS_getrandom, buf, buflen, flags));
+}
+# define HAVE_GETRANDOM
+#endif
+
+static int prng_init(void)
+{
+	int seed;
+
+	if (getrandom(&seed, sizeof(seed), 0) != sizeof(seed)) {
+		xlog(L_ERROR, "Unable to obtain seed for PRNG via getrandom()");
+		return -1;
+	}
+
+	srand(seed);
+	return 0;
+}
+
+static void wait_for_dbaccess(void)
+{
+	usleep(REEXPDB_DBFILE_WAIT_USEC + (rand() % REEXPDB_DBFILE_WAIT_USEC));
+}
+
+static bool sqlite_plug_init(void)
+{
+	char *sqlerr;
+	int ret;
+
+	if (init_done)
+		return true;
+
+	if (prng_init() != 0)
+		return false;
+
+	ret = sqlite3_open_v2(conf_get_str_with_def("reexport", "sqlitedb", REEXPDB_DBFILE),
+			      &db, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_FULLMUTEX,
+			      NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_ERROR, "Unable to open reexport database: %s", sqlite3_errstr(ret));
+		return false;
+	}
+
+again:
+	ret = sqlite3_exec(db, "CREATE TABLE IF NOT EXISTS fsidnums (num INTEGER PRIMARY KEY CHECK (num > 0 AND num < 4294967296), path TEXT UNIQUE); CREATE INDEX IF NOT EXISTS idx_ids_path ON fsidnums (path);", NULL, NULL, &sqlerr);
+	switch (ret) {
+	case SQLITE_OK:
+		init_done = 1;
+		ret = 0;
+		break;
+	case SQLITE_BUSY:
+	case SQLITE_LOCKED:
+		wait_for_dbaccess();
+		goto again;
+	default:
+		xlog(L_ERROR, "Unable to init reexport database: %s", sqlite3_errstr(ret));
+		sqlite3_free(sqlerr);
+		sqlite3_close_v2(db);
+		ret = -1;
+	}
+
+	return ret == 0 ? true : false;
+}
+
+static void sqlite_plug_destroy(void)
+{
+	if (!init_done)
+		return;
+
+	sqlite3_close_v2(db);
+}
+
+static bool get_fsidnum_by_path(char *path, uint32_t *fsidnum, bool *found)
+{
+	static const char fsidnum_by_path_sql[] = "SELECT num FROM fsidnums WHERE path = ?1;";
+	sqlite3_stmt *stmt = NULL;
+	bool success = false;
+	int ret;
+
+	*found = false;
+
+	ret = sqlite3_prepare_v2(db, fsidnum_by_path_sql, sizeof(fsidnum_by_path_sql), &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_WARNING, "Unable to prepare SQL query '%s': %s", fsidnum_by_path_sql, sqlite3_errstr(ret));
+		goto out;
+	}
+
+	ret = sqlite3_bind_text(stmt, 1, path, -1, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_WARNING, "Unable to bind SQL query '%s': %s", fsidnum_by_path_sql, sqlite3_errstr(ret));
+		goto out;
+	}
+
+again:
+	ret = sqlite3_step(stmt);
+	switch (ret) {
+	case SQLITE_ROW:
+		*fsidnum = sqlite3_column_int(stmt, 0);
+		success = true;
+		*found = true;
+		break;
+	case SQLITE_DONE:
+		/* No hit */
+		success = true;
+		*found = false;
+		break;
+	case SQLITE_BUSY:
+	case SQLITE_LOCKED:
+		wait_for_dbaccess();
+		goto again;
+	default:
+		xlog(L_WARNING, "Error while looking up '%s' in database: %s", path, sqlite3_errstr(ret));
+	}
+
+out:
+	sqlite3_finalize(stmt);
+	return success;
+}
+
+static bool sqlite_plug_path_by_fsidnum(uint32_t fsidnum, char **path, bool *found)
+{
+	static const char path_by_fsidnum_sql[] = "SELECT path FROM fsidnums WHERE num = ?1;";
+	sqlite3_stmt *stmt = NULL;
+	bool success = false;
+	int ret;
+
+	*found = false;
+
+	ret = sqlite3_prepare_v2(db, path_by_fsidnum_sql, sizeof(path_by_fsidnum_sql), &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_WARNING, "Unable to prepare SQL query '%s': %s", path_by_fsidnum_sql, sqlite3_errstr(ret));
+		goto out;
+	}
+
+	ret = sqlite3_bind_int(stmt, 1, fsidnum);
+	if (ret != SQLITE_OK) {
+		xlog(L_WARNING, "Unable to bind SQL query '%s': %s", path_by_fsidnum_sql, sqlite3_errstr(ret));
+		goto out;
+	}
+
+again:
+	ret = sqlite3_step(stmt);
+	switch (ret) {
+	case SQLITE_ROW:
+		*path = strdup((char *)sqlite3_column_text(stmt, 0));
+		if (*path) {
+			*found = true;
+			success = true;
+		} else {
+			xlog(L_WARNING, "Out of memory");
+		}
+		break;
+	case SQLITE_DONE:
+		/* No hit */
+		*found = false;
+		success = true;
+		break;
+	case SQLITE_BUSY:
+	case SQLITE_LOCKED:
+		wait_for_dbaccess();
+		goto again;
+	default:
+		xlog(L_WARNING, "Error while looking up '%i' in database: %s", fsidnum, sqlite3_errstr(ret));
+	}
+
+out:
+	sqlite3_finalize(stmt);
+	return success;
+}
+
+static bool new_fsidnum_by_path(char *path, uint32_t *fsidnum)
+{
+	/*
+	 * This query is a little tricky. We use SQL to find and claim the smallest free fsid number.
+	 * To find a free fsid the fsidnums is left joined to itself but with an offset of 1.
+	 * Everything after the UNION statement is to handle the corner case where fsidnums
+	 * is empty. In this case we want 1 as first fsid number.
+	 */
+	static const char new_fsidnum_by_path_sql[] = "INSERT INTO fsidnums VALUES ((SELECT ids1.num + 1 FROM fsidnums AS ids1 LEFT JOIN fsidnums AS ids2 ON ids2.num = ids1.num + 1 WHERE ids2.num IS NULL UNION SELECT 1 WHERE NOT EXISTS (SELECT NULL FROM fsidnums WHERE num = 1) LIMIT 1), ?1) RETURNING num;";
+
+	sqlite3_stmt *stmt = NULL;
+	int ret, check = 0;
+	bool success = false;
+
+	ret = sqlite3_prepare_v2(db, new_fsidnum_by_path_sql, sizeof(new_fsidnum_by_path_sql), &stmt, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_WARNING, "Unable to prepare SQL query '%s': %s", new_fsidnum_by_path_sql, sqlite3_errstr(ret));
+		goto out;
+	}
+
+	ret = sqlite3_bind_text(stmt, 1, path, -1, NULL);
+	if (ret != SQLITE_OK) {
+		xlog(L_WARNING, "Unable to bind SQL query '%s': %s", new_fsidnum_by_path_sql, sqlite3_errstr(ret));
+		goto out;
+	}
+
+again:
+	ret = sqlite3_step(stmt);
+	switch (ret) {
+	case SQLITE_ROW:
+		*fsidnum = sqlite3_column_int(stmt, 0);
+		success = true;
+		break;
+	case SQLITE_CONSTRAINT:
+		/* Maybe we lost the race against another writer and the path is now present. */
+		check = 1;
+		break;
+	case SQLITE_BUSY:
+	case SQLITE_LOCKED:
+		wait_for_dbaccess();
+		goto again;
+	default:
+		xlog(L_WARNING, "Error while looking up '%s' in database: %s", path, sqlite3_errstr(ret));
+	}
+
+out:
+	sqlite3_finalize(stmt);
+
+	if (check) {
+		bool found = false;
+
+		get_fsidnum_by_path(path, fsidnum, &found);
+		if (!found)
+			xlog(L_WARNING, "SQLITE_CONSTRAINT error while inserting '%s' in database", path);
+	}
+
+	return success;
+}
+
+static bool sqlite_plug_fsidnum_by_path(char *path, uint32_t *fsidnum, int may_create, bool *found)
+{
+	bool success;
+
+	success = get_fsidnum_by_path(path, fsidnum, found);
+	if (success) {
+		if (!*found && may_create) {
+			success = new_fsidnum_by_path(path, fsidnum);
+			if (success)
+				*found = true;
+		}
+	}
+
+	return success;
+}
+
+struct reexpdb_backend_plugin sqlite_plug_ops = {
+	.fsidnum_by_path = sqlite_plug_fsidnum_by_path,
+	.path_by_fsidnum = sqlite_plug_path_by_fsidnum,
+	.initdb = sqlite_plug_init,
+	.destroydb = sqlite_plug_destroy,
+};
diff --git a/support/reexport/fsidd.c b/support/reexport/fsidd.c
new file mode 100644
index 0000000..3e62b3f
--- /dev/null
+++ b/support/reexport/fsidd.c
@@ -0,0 +1,196 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+#ifdef HAVE_DLFCN_H
+#include <dlfcn.h>
+#endif
+#include <event2/event.h>
+
+#include "conffile.h"
+#include "reexport_backend.h"
+#include "reexport.h"
+#include "xcommon.h"
+#include "xlog.h"
+
+static struct event_base *evbase;
+static struct reexpdb_backend_plugin *dbbackend = &sqlite_plug_ops;
+
+/* assert_safe() always evalutes it argument, as it might have
+ * a side-effect.  assert() won't if compiled with NDEBUG
+ */
+#define assert_safe(__sideeffect) (__sideeffect ? 0 : ({assert(0) ; 0;}))
+
+static void client_cb(evutil_socket_t cl, short ev, void *d)
+{
+	struct event *me = d;
+	char buf[PATH_MAX * 2];
+	int n;
+
+	(void)ev;
+
+	n = recv(cl, buf, sizeof(buf) - 1, 0);
+	if (n <= 0) {
+		event_del(me);
+		event_free(me);
+		close(cl);
+		return;
+	}
+
+	buf[n] = '\0';
+
+	if (strncmp(buf, "get_fsidnum ", strlen("get_fsidnum ")) == 0) {
+		char *req_path = buf + strlen("get_fsidnum ");
+		uint32_t fsidnum;
+		char *answer = NULL;
+		bool found;
+
+		assert(req_path < buf + n );
+
+		printf("client asks for %s\n", req_path);
+
+		if (dbbackend->fsidnum_by_path(req_path, &fsidnum, false, &found)) {
+			if (found)
+				assert_safe(asprintf(&answer, "+ %u", fsidnum) != -1);
+			else
+				assert_safe(asprintf(&answer, "+ ") != -1);
+		} else {
+			assert_safe(asprintf(&answer, "- %s", "Command failed") != -1);
+		}
+
+		(void)send(cl, answer, strlen(answer), 0);
+
+		free(answer);
+	} else if (strncmp(buf, "get_or_create_fsidnum ", strlen("get_or_create_fsidnum ")) == 0) {
+		char *req_path = buf + strlen("get_or_create_fsidnum ");
+		uint32_t fsidnum;
+		char *answer = NULL;
+		bool found;
+
+		assert(req_path < buf + n );
+
+
+		if (dbbackend->fsidnum_by_path(req_path, &fsidnum, true, &found)) {
+			if (found) {
+				assert_safe(asprintf(&answer, "+ %u", fsidnum) != -1);
+			} else {
+				assert_safe(asprintf(&answer, "+ ") != -1);
+			}
+		
+		} else {
+			assert_safe(asprintf(&answer, "- %s", "Command failed") != -1);
+		}
+
+		(void)send(cl, answer, strlen(answer), 0);
+
+		free(answer);
+	} else if (strncmp(buf, "get_path ", strlen("get_path ")) == 0) {
+		char *req_fsidnum = buf + strlen("get_path ");
+		char *path = NULL, *answer = NULL, *endp;
+		bool bad_input = true;
+		uint32_t fsidnum;
+		bool found;
+
+		assert(req_fsidnum < buf + n );
+
+		errno = 0;
+		fsidnum = strtoul(req_fsidnum, &endp, 10);
+		if (errno == 0 && *endp == '\0') {
+			bad_input = false;
+		}
+
+		if (bad_input) {
+			assert_safe(asprintf(&answer, "- %s", "Command failed: Bad input") != -1);
+		} else {
+			if (dbbackend->path_by_fsidnum(fsidnum, &path, &found)) {
+				if (found)
+					assert_safe(asprintf(&answer, "+ %s", path) != -1);
+				else
+					assert_safe(asprintf(&answer, "+ ") != -1);
+			} else {
+				assert_safe(asprintf(&answer, "+ ") != -1);
+			}
+		}
+
+		(void)send(cl, answer, strlen(answer), 0);
+
+		free(path);
+		free(answer);
+	} else if (strcmp(buf, "version") == 0) {
+		char answer[] = "+ 1";
+
+		(void)send(cl, answer, strlen(answer), 0);
+	} else {
+		char *answer = NULL;
+
+		assert_safe(asprintf(&answer, "- bad command") != -1);
+		(void)send(cl, answer, strlen(answer), 0);
+
+		free(answer);
+	}
+}
+
+static void srv_cb(evutil_socket_t fd, short ev, void *d)
+{
+	int cl = accept4(fd, NULL, NULL, SOCK_NONBLOCK);
+	struct event *client_ev;
+	
+	(void)ev;
+	(void)d;
+
+	client_ev = event_new(evbase, cl, EV_READ | EV_PERSIST | EV_CLOSED, client_cb, event_self_cbarg());
+	event_add(client_ev, NULL);
+}
+
+int main(void)
+{
+	struct event *srv_ev;
+	struct sockaddr_un addr;
+	char *sock_file;
+	int srv;
+
+	conf_init_file(NFS_CONFFILE);
+
+	if (!dbbackend->initdb()) {
+		return 1;
+	}
+
+	sock_file = conf_get_str_with_def("reexport", "fsidd_socket", FSID_SOCKET_NAME);
+
+	memset(&addr, 0, sizeof(struct sockaddr_un));
+	addr.sun_family = AF_UNIX;
+	strncpy(addr.sun_path, sock_file, sizeof(addr.sun_path) - 1);
+	if (addr.sun_path[0] == '@')
+		/* "abstract" socket namespace */
+		addr.sun_path[0] = 0;
+	else
+		unlink(sock_file);
+
+	srv = socket(AF_UNIX, SOCK_SEQPACKET | SOCK_NONBLOCK, 0);
+	if (srv == -1) {
+		xlog(L_WARNING, "Unable to create AF_UNIX socket for %s: %m\n", sock_file);
+		return 1;
+	}
+
+	if (bind(srv, (const struct sockaddr *)&addr, sizeof(struct sockaddr_un)) == -1) {
+		xlog(L_WARNING, "Unable to bind %s: %m\n", sock_file);
+		return 1;
+	}
+
+	if (listen(srv, 5) == -1) {
+		xlog(L_WARNING, "Unable to listen on %s: %m\n", sock_file);
+		return 1;
+	}
+
+	evbase = event_base_new();
+
+	srv_ev = event_new(evbase, srv, EV_READ | EV_PERSIST, srv_cb, NULL);
+	event_add(srv_ev, NULL);
+
+	event_base_dispatch(evbase);
+
+	dbbackend->destroydb();
+
+	return 0;
+}
diff --git a/support/reexport/reexport.c b/support/reexport/reexport.c
new file mode 100644
index 0000000..7851658
--- /dev/null
+++ b/support/reexport/reexport.c
@@ -0,0 +1,324 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifdef HAVE_DLFCN_H
+#include <dlfcn.h>
+#endif
+#include <sys/types.h>
+#include <sys/vfs.h>
+#include <errno.h>
+
+#include "nfsd_path.h"
+#include "conffile.h"
+#include "nfslib.h"
+#include "reexport.h"
+#include "xcommon.h"
+#include "xlog.h"
+
+static int fsidd_srv = -1;
+
+static bool connect_fsid_service(void)
+{
+	struct sockaddr_un addr;
+	char *sock_file;
+	int ret;
+	int s;
+
+	if (fsidd_srv != -1)
+		return true;
+
+	sock_file = conf_get_str_with_def("reexport", "fsidd_socket", FSID_SOCKET_NAME);
+
+	memset(&addr, 0, sizeof(struct sockaddr_un));
+	addr.sun_family = AF_UNIX;
+	strncpy(addr.sun_path, sock_file, sizeof(addr.sun_path) - 1);
+	if (addr.sun_path[0] == '@')
+		/* "abstract" socket namespace */
+		addr.sun_path[0] = 0;
+
+	s = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+	if (s == -1) {
+		xlog(L_WARNING, "Unable to create AF_UNIX socket for %s: %m\n", sock_file);
+		return false;
+	}
+
+	ret = connect(s, (const struct sockaddr *)&addr, sizeof(struct sockaddr_un));
+	if (ret == -1) {
+		xlog(L_WARNING, "Unable to connect %s: %m, is fsidd running?\n", sock_file);
+		return false;
+	}
+
+	fsidd_srv = s;
+
+	return true;
+}
+
+int reexpdb_init(void)
+{
+	int try_count = 3;
+
+	while (try_count > 0 && !connect_fsid_service()) {
+		sleep(1);
+		try_count--;
+	}
+
+	return try_count > 0;
+}
+
+void reexpdb_destroy(void)
+{
+	close(fsidd_srv);
+	fsidd_srv = -1;
+}
+
+static bool parse_fsidd_reply(const char *cmd_info, char *buf, size_t len, char **result)
+{
+	if (len == 0) {
+		xlog(L_WARNING, "Unable to read %s result: server closed the connection", cmd_info);
+		return false;
+	} else if (len < 2) {
+		xlog(L_WARNING, "Unable to read %s result: server sent too few bytes", cmd_info);
+		return false;
+	}
+
+	if (buf[0] == '-') {
+		if (len > 2) {
+			char *reason = buf + 2;
+			xlog(L_WARNING, "Command %s failed, server said: %s", cmd_info, reason);
+		} else {
+			xlog(L_WARNING, "Command %s failed at server side", cmd_info);
+		}
+
+		return false;
+	}
+
+	if (buf[0] != '+') {
+		xlog(L_WARNING, "Unable to read %s result: server sent malformed answer", cmd_info);
+		return false;
+	}
+
+	if (len > 2) {
+		*result = strdup(buf + 2);
+	} else {
+		*result = NULL;
+	}
+
+	return true;
+}
+
+static bool do_fsidd_cmd(const char *cmd_info, char *msg, size_t len, char **result)
+{
+	char recvbuf[1024];
+	int n;
+
+	if (fsidd_srv == -1) {
+		xlog(L_NOTICE, "Reconnecting to fsid services");
+		if (reexpdb_init() == false)
+			return false;
+	}
+
+	xlog(D_GENERAL, "Request to fsidd: msg=\"%s\" len=%zd", msg, len);
+
+	if (write(fsidd_srv, msg, len) == -1) {
+		xlog(L_WARNING, "Unable to send %s command: %m", cmd_info);
+		goto out_close;
+	}
+
+	n = read(fsidd_srv, recvbuf, sizeof(recvbuf) - 1);
+	if (n <= -1) {
+		xlog(L_WARNING, "Unable to recv %s answer: %m", cmd_info);
+		goto out_close;
+	} else if (n == sizeof(recvbuf) - 1) {
+		//TODO: use better way to detect truncation
+		xlog(L_WARNING, "Unable to recv %s answer: answer truncated", cmd_info);
+		goto out_close;
+	}
+	recvbuf[n] = '\0';
+
+	xlog(D_GENERAL, "Answer from fsidd: msg=\"%s\" len=%i", recvbuf, n);
+
+	if (parse_fsidd_reply(cmd_info, recvbuf, n, result) == false) {
+		goto out_close;
+	}
+
+	return true;
+
+out_close:
+	close(fsidd_srv);
+	fsidd_srv = -1;
+	return false;
+}
+
+static bool fsidnum_get_by_path(char *path, uint32_t *fsidnum, bool may_create)
+{
+	char *msg, *result;
+	bool ret = false;
+	int len;
+
+	char *cmd = may_create ? "get_or_create_fsidnum" : "get_fsidnum";
+
+	len = asprintf(&msg, "%s %s", cmd, path);
+	if (len == -1) {
+		xlog(L_WARNING, "Unable to build %s command: %m", cmd);
+		goto out;
+	}
+
+	if (do_fsidd_cmd(cmd, msg, len, &result) == false) {
+		goto out;
+	}
+
+	if (result) {
+		bool bad_input = true;
+		char *endp;
+
+		errno = 0;
+		*fsidnum = strtoul(result, &endp, 10);
+		if (errno == 0 && *endp == '\0') {
+			bad_input = false;
+		}
+
+		free(result);
+
+		if (!bad_input) {
+			ret = true;
+		} else {
+			xlog(L_NOTICE, "Got malformed fsid for path %s", path);
+		}
+	} else {
+		xlog(L_NOTICE, "No fsid found for path %s", path);
+	}
+
+out:
+	free(msg);
+	return ret;
+}
+
+static bool path_by_fsidnum(uint32_t fsidnum, char **path)
+{
+	char *msg, *result;
+	bool ret = false;
+	int len;
+
+	len = asprintf(&msg, "get_path %d", (unsigned int)fsidnum);
+	if (len == -1) {
+		xlog(L_WARNING, "Unable to build get_path command: %m");
+		goto out;
+	}
+
+	if (do_fsidd_cmd("get_path", msg, len, &result) == false) {
+		goto out;
+	}
+
+	if (result) {
+		*path = result;
+		ret = true;
+	} else {
+		xlog(L_NOTICE, "No path found for fsid %u", (unsigned int)fsidnum);
+	}
+
+out:
+	free(msg);
+	return ret;
+}
+
+/*
+ * reexpdb_fsidnum_by_path - Lookup a fsid by path.
+ *
+ * @path: File system path used as lookup key
+ * @fsidnum: Pointer where found fsid is written to
+ * @may_create: If non-zero, allocate new fsid if lookup failed
+ *
+ */
+int reexpdb_fsidnum_by_path(char *path, uint32_t *fsidnum, int may_create)
+{
+	return fsidnum_get_by_path(path, fsidnum, may_create);
+}
+
+/*
+ * reexpdb_uncover_subvolume - Make sure a subvolume is present.
+ *
+ * @fsidnum: Numerical fsid number to look for
+ *
+ * Subvolumes (NFS cross mounts) get automatically mounted upon first
+ * access and can vanish after fs.nfs.nfs_mountpoint_timeout seconds.
+ * Also if the NFS server reboots, clients can still have valid file
+ * handles for such a subvolume.
+ *
+ * If kNFSd asks mountd for the path of a given fsidnum it can
+ * trigger an automount by calling statfs() on the given path.
+ */
+void reexpdb_uncover_subvolume(uint32_t fsidnum)
+{
+	struct statfs st;
+	char *path = NULL;
+	int ret;
+
+	if (path_by_fsidnum(fsidnum, &path)) {
+		ret = nfsd_path_statfs(path, &st);
+		if (ret == -1)
+			xlog(L_WARNING, "statfs() failed");
+	}
+
+	free(path);
+}
+
+/*
+ * reexpdb_apply_reexport_settings - Apply reexport specific settings to an exportent
+ *
+ * @ep: exportent to apply to
+ * @flname: Current export file, only useful for logging
+ * @flline: Current line, only useful for logging
+ *
+ * This is a helper function for applying reexport specific settings to an exportent.
+ * It searches a suitable fsid an sets @ep->e_fsid.
+ */
+int reexpdb_apply_reexport_settings(struct exportent *ep, char *flname, int flline)
+{
+	uint32_t fsidnum;
+	bool found, is_v4root = ((ep->e_flags & NFSEXP_FSID) && !ep->e_fsid);
+	int ret = 0;
+
+	if (ep->e_reexport == REEXP_NONE)
+		goto out;
+
+	if (ep->e_uuid)
+		goto out;
+
+	if (is_v4root)
+		goto out;
+
+	found = reexpdb_fsidnum_by_path(ep->e_path, &fsidnum, 0);
+	if (!found) {
+		if (ep->e_reexport == REEXP_AUTO_FSIDNUM) {
+			found = reexpdb_fsidnum_by_path(ep->e_path, &fsidnum, 1);
+			if (!found) {
+				xlog(L_ERROR, "%s:%i: Unable to generate fsid for %s",
+				     flname, flline, ep->e_path);
+				ret = -1;
+				goto out;
+			}
+		} else {
+			if (!ep->e_fsid) {
+				xlog(L_ERROR, "%s:%i: Selected 'reexport=' mode requires either a UUID 'fsid=' or a numerical 'fsid=' or a reexport db entry %d",
+				     flname, flline, ep->e_fsid);
+				ret = -1;
+			}
+
+			goto out;
+		}
+	}
+
+	if (ep->e_fsid) {
+		if (ep->e_fsid != fsidnum) {
+			xlog(L_ERROR, "%s:%i: Selected 'reexport=' mode requires configured numerical 'fsid=' to agree with reexport db entry",
+			     flname, flline);
+			ret = -1;
+		}
+	} else {
+		ep->e_fsid = fsidnum;
+	}
+
+out:
+	return ret;
+}
diff --git a/support/reexport/reexport.h b/support/reexport/reexport.h
new file mode 100644
index 0000000..85fd59c
--- /dev/null
+++ b/support/reexport/reexport.h
@@ -0,0 +1,20 @@
+#ifndef REEXPORT_H
+#define REEXPORT_H
+
+#include "nfslib.h"
+
+enum {
+	REEXP_NONE = 0,
+	REEXP_AUTO_FSIDNUM,
+	REEXP_PREDEFINED_FSIDNUM,
+};
+
+int reexpdb_init(void);
+void reexpdb_destroy(void);
+int reexpdb_fsidnum_by_path(char *path, uint32_t *fsidnum, int may_create);
+int reexpdb_apply_reexport_settings(struct exportent *ep, char *flname, int flline);
+void reexpdb_uncover_subvolume(uint32_t fsidnum);
+
+#define FSID_SOCKET_NAME "@/run/fsid.sock"
+
+#endif /* REEXPORT_H */
diff --git a/support/reexport/reexport_backend.h b/support/reexport/reexport_backend.h
new file mode 100644
index 0000000..4940f06
--- /dev/null
+++ b/support/reexport/reexport_backend.h
@@ -0,0 +1,47 @@
+#ifndef REEXPORT_BACKEND_H
+#define REEXPORT_BACKEND_H
+
+extern struct reexpdb_backend_plugin sqlite_plug_ops;
+
+struct reexpdb_backend_plugin {
+	/*
+	 * Find or allocate a fsidnum for a given path.
+	 *
+	 * @path: Path to look for
+	 * @fsidnum: Pointer to an uint32_t variable
+	 * @may_create: If non-zero, a fsidnum will be allocated if none was found
+	 *
+	 * Returns true if either an fsidnum was found or successfully allocated,
+	 * false otherwise.
+	 * On success, the fsidnum will be stored into @fsidnum.
+	 * Upon errors, false is returned and errors are logged.
+	 */
+	bool (*fsidnum_by_path)(char *path, uint32_t *fsidnum, int may_create, bool *found);
+
+	/*
+	 * Lookup path by a given fsidnum
+	 *
+	 * @fsidnum: fsidnum to look for
+	 * @path: address of a char pointer
+	 *
+	 * Returns true if a path was found, false otherwise.
+	 * Upon errors, false is returned and errors are logged.
+	 * In case of success, the function returns the found path
+	 * via @path, @path will point to a freshly allocated buffer
+	 * which is free()'able.
+	 */
+	bool (*path_by_fsidnum)(uint32_t fsidnum, char **path, bool *found);
+
+	/*
+	 * Init database connection, can get called multiple times.
+	 * Returns true on success, false otherwise.
+	 */
+	bool (*initdb)(void);
+
+	/*
+	 * Undoes initdb().
+	 */
+	void (*destroydb)(void);
+};
+
+#endif /* REEXPORT_BACKEND_H */