Remove all use of /var/lib/nfs/xtab

/var/lib/nfs/xtab is only used to find out what has been exported to
the kernel.  This is more reliably done by reading
/proc/fs/nfs{,d}/export and nfs-utils uses that file if is available.
So xtab is only need if you have an incredibly ancient kernel which
doesn't have /proc/fs/nfs/export (and so which only supports NFSv2) or
if /proc is not mounted.

Neither of these are credible contexts to run a modern nfs-utils,
so stop creating or reading the xtab file.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

7 files changed, 7 insertions, 56 deletions

diff --git a/Makefile.am b/Makefile.am
index 4a2edc6..e1f39aa 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -23,7 +23,6 @@ ACLOCAL_AMFLAGS = -I aclocal
 
 install-data-hook:
 	if [ ! -d $(DESTDIR)$(statedir) ]; then mkdir -p $(DESTDIR)$(statedir); fi
-	touch $(DESTDIR)$(statedir)/xtab; chmod 644 $(DESTDIR)$(statedir)/xtab
 	touch $(DESTDIR)$(statedir)/etab; chmod 644 $(DESTDIR)$(statedir)/etab
 	touch $(DESTDIR)$(statedir)/rmtab; chmod 644 $(DESTDIR)$(statedir)/rmtab
 	mkdir -p $(DESTDIR)$(statdpath)/sm $(DESTDIR)$(statdpath)/sm.bak
@@ -32,7 +31,7 @@ install-data-hook:
 	-chown $(statduser) $(DESTDIR)$(statdpath)/sm $(DESTDIR)$(statdpath)/sm.bak $(DESTDIR)$(statdpath)/state
 
 uninstall-hook:
-	rm $(DESTDIR)$(statedir)/xtab
+	rm -f $(DESTDIR)$(statedir)/xtab
 	rm $(DESTDIR)$(statedir)/etab
 	rm $(DESTDIR)$(statedir)/rmtab
 	rm $(DESTDIR)$(statdpath)/state
diff --git a/support/export/xtab.c b/support/export/xtab.c
index e953071..10d9dbc 100644
--- a/support/export/xtab.c
+++ b/support/export/xtab.c
@@ -1,7 +1,7 @@
 /*
  * support/export/xtab.c
  *
- * Interface to the xtab file.
+ * Interface to the etab/exports file.
  *
  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  */
@@ -29,7 +29,6 @@ xtab_read(char *xtab, char *lockfn, int is_export)
 {
     /* is_export == 0  => reading /proc/fs/nfs/exports - we know these things are exported to kernel
      * is_export == 1  => reading /var/lib/nfs/etab - these things are allowed to be exported
-     * is_export == 2  => reading /var/lib/nfs/xtab - these things might be known to kernel
      */
 	struct exportent	*xp;
 	nfs_export		*exp;
@@ -55,9 +54,6 @@ xtab_read(char *xtab, char *lockfn, int is_export)
 			if ((xp->e_flags & NFSEXP_FSID) && xp->e_fsid == 0)
 				v4root_needed = 0;
 			break;
-		case 2:
-			exp->m_exported = -1;/* may be exported */
-			break;
 		}
 	}
 	endexportent();
@@ -79,7 +75,7 @@ xtab_mount_read(void)
 		return xtab_read(_PATH_PROC_EXPORTS_ALT,
 				 _PATH_PROC_EXPORTS_ALT, 0);
 	} else
-		return xtab_read(_PATH_XTAB, _PATH_XTABLCK, 2);
+		return 0;
 }
 
 int
@@ -135,29 +131,6 @@ xtab_export_write()
 	return xtab_write(_PATH_ETAB, _PATH_ETABTMP, _PATH_ETABLCK, 1);
 }
 
-int
-xtab_mount_write()
-{
-	return xtab_write(_PATH_XTAB, _PATH_XTABTMP, _PATH_XTABLCK, 0);
-}
-
-void
-xtab_append(nfs_export *exp)
-{
-	struct exportent xe;
-	int		lockid;
-
-	if ((lockid = xflock(_PATH_XTABLCK, "w")) < 0)
-		return;
-	setexportent(_PATH_XTAB, "a");
-	xe = exp->m_export;
-	xe.e_hostname = exp->m_client->m_hostname;
-	putexportent(&xe);
-	endexportent();
-	xfunlock(lockid);
-	exp->m_xtabent = 1;
-}
-
 /*
  * rename newfile onto oldfile unless
  * they are identical
diff --git a/support/include/exportfs.h b/support/include/exportfs.h
index 32d4fe9..08ef30a 100644
--- a/support/include/exportfs.h
+++ b/support/include/exportfs.h
@@ -96,7 +96,7 @@ typedef struct mexport {
 	struct mexport *	m_next;
 	struct mclient *	m_client;
 	struct exportent	m_export;
-	int			m_exported;	/* known to knfsd. -1 means not sure */
+	int			m_exported;	/* known to knfsd. */
 	int			m_xtabent  : 1,	/* xtab entry exists */
 				m_mayexport: 1,	/* derived from xtabbed */
 				m_changed  : 1, /* options (may) have changed */
@@ -150,9 +150,7 @@ int				export_unexport(nfs_export *);
 
 int				xtab_mount_read(void);
 int				xtab_export_read(void);
-int				xtab_mount_write(void);
 int				xtab_export_write(void);
-void				xtab_append(nfs_export *);
 
 int				secinfo_addflavor(struct flav_info *, struct exportent *);
 
diff --git a/support/include/nfslib.h b/support/include/nfslib.h
index ddd71ac..777f398 100644
--- a/support/include/nfslib.h
+++ b/support/include/nfslib.h
@@ -35,15 +35,6 @@
 #ifndef _PATH_IDMAPDCONF
 #define _PATH_IDMAPDCONF	"/etc/idmapd.conf"
 #endif
-#ifndef _PATH_XTAB
-#define _PATH_XTAB		NFS_STATEDIR "/xtab"
-#endif
-#ifndef _PATH_XTABTMP
-#define _PATH_XTABTMP		NFS_STATEDIR "/xtab.tmp"
-#endif
-#ifndef _PATH_XTABLCK
-#define _PATH_XTABLCK		NFS_STATEDIR "/.xtab.lock"
-#endif
 #ifndef _PATH_ETAB
 #define _PATH_ETAB		NFS_STATEDIR "/etab"
 #endif
diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
index 5136810..98368a5 100644
--- a/utils/exportfs/exportfs.c
+++ b/utils/exportfs/exportfs.c
@@ -219,8 +219,6 @@ main(int argc, char **argv)
 	xtab_export_write();
 	if (new_cache)
 		cache_flush(force_flush);
-	if (!new_cache)
-		xtab_mount_write();
 
 	return export_errno;
 }
@@ -238,7 +236,7 @@ exports_update_one(nfs_export *exp, int verbose)
 		       exp->m_export.e_path, exp->m_export.e_mountpoint);
 		exp->m_mayexport = 0;
 	}
-	if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
+	if (exp->m_mayexport && exp->m_changed) {
 		if (verbose)
 			printf("%sexporting %s:%s to kernel\n",
 			       exp->m_exported ?"re":"",
diff --git a/utils/mountd/auth.c b/utils/mountd/auth.c
index 0881d9a..b612d88 100644
--- a/utils/mountd/auth.c
+++ b/utils/mountd/auth.c
@@ -46,7 +46,6 @@ void
 auth_init(void)
 {
 	auth_reload();
-	xtab_mount_write();
 }
 
 /*
diff --git a/utils/mountd/mountd.c b/utils/mountd/mountd.c
index 7a51b09..981abd4 100644
--- a/utils/mountd/mountd.c
+++ b/utils/mountd/mountd.c
@@ -107,7 +107,6 @@ unregister_services (void)
 static void
 cleanup_lockfiles (void)
 {
-	unlink(_PATH_XTABLCK);
 	unlink(_PATH_ETABLCK);
 	unlink(_PATH_RMTABLCK);
 }
@@ -289,7 +288,7 @@ mount_umntall_1_svc(struct svc_req *rqstp, void *UNUSED(argp),
 	xlog(D_CALL, "Received UMNTALL request from %s",
 		host_ntop(sap, buf, sizeof(buf)));
 
-	/* Reload /etc/xtab if necessary */
+	/* Reload /etc/exports if necessary */
 	auth_reload();
 
 	mountlist_del_all(nfs_getrpccaller(rqstp->rq_xprt));
@@ -350,7 +349,7 @@ mount_pathconf_2_svc(struct svc_req *rqstp, dirpath *path, ppathcnf *res)
 	if (*p == '\0')
 		p = "/";
 
-	/* Reload /etc/xtab if necessary */
+	/* Reload /etc/exports if necessary */
 	auth_reload();
 
 	/* Resolve symlinks */
@@ -531,12 +530,6 @@ get_rootfh(struct svc_req *rqstp, dirpath *path, nfs_export **expret,
 	} else {
 		int did_export = 0;
 	retry:
-		if (exp->m_exported<1) {
-			export_export(exp);
-			did_export = 1;
-		}
-		if (!exp->m_xtabent)
-			xtab_append(exp);
 
 		if (v3)
 			fh = getfh_size((struct sockaddr_in *)sap, p, 64);