6 files changed, 35 insertions, 4 deletions

diff --git a/usr/src/cmd/zfs/zfs_main.c b/usr/src/cmd/zfs/zfs_main.c
index 1f7f47d08a..ca60c91d18 100644
--- a/usr/src/cmd/zfs/zfs_main.c
+++ b/usr/src/cmd/zfs/zfs_main.c
@@ -4197,6 +4197,7 @@ main(int argc, char **argv)
 		/*
 		 * Run the appropriate command.
 		 */
+		libzfs_mnttab_cache(g_zfs, B_TRUE);
 		if (find_command_idx(cmdname, &i) == 0) {
 			current_command = &command_table[i];
 			ret = command_table[i].func(argc - 1, argv + 1);
@@ -4209,6 +4210,7 @@ main(int argc, char **argv)
 			    "command '%s'\n"), cmdname);
 			usage(B_FALSE);
 		}
+		libzfs_mnttab_cache(g_zfs, B_FALSE);
 	}
 
 	(void) fclose(mnttab_file);
diff --git a/usr/src/lib/libzfs/common/libzfs.h b/usr/src/lib/libzfs/common/libzfs.h
index b723571bc7..8e5de94a40 100644
--- a/usr/src/lib/libzfs/common/libzfs.h
+++ b/usr/src/lib/libzfs/common/libzfs.h
@@ -178,6 +178,7 @@ extern const char *libzfs_error_action(libzfs_handle_t *);
 extern const char *libzfs_error_description(libzfs_handle_t *);
 extern void libzfs_mnttab_init(libzfs_handle_t *);
 extern void libzfs_mnttab_fini(libzfs_handle_t *);
+extern void libzfs_mnttab_cache(libzfs_handle_t *, boolean_t);
 extern int libzfs_mnttab_find(libzfs_handle_t *, const char *,
     struct mnttab *);
 extern void libzfs_mnttab_add(libzfs_handle_t *, const char *,
diff --git a/usr/src/lib/libzfs/common/libzfs_dataset.c b/usr/src/lib/libzfs/common/libzfs_dataset.c
index 80dd06cb4a..a9f01ebc13 100644
--- a/usr/src/lib/libzfs/common/libzfs_dataset.c
+++ b/usr/src/lib/libzfs/common/libzfs_dataset.c
@@ -605,11 +605,15 @@ libzfs_mnttab_cache_compare(const void *arg1, const void *arg2)
 void
 libzfs_mnttab_init(libzfs_handle_t *hdl)
 {
-	struct mnttab entry;
-
 	assert(avl_numnodes(&hdl->libzfs_mnttab_cache) == 0);
 	avl_create(&hdl->libzfs_mnttab_cache, libzfs_mnttab_cache_compare,
 	    sizeof (mnttab_node_t), offsetof(mnttab_node_t, mtn_node));
+}
+
+void
+libzfs_mnttab_update(libzfs_handle_t *hdl)
+{
+	struct mnttab entry;
 
 	rewind(hdl->libzfs_mnttab);
 	while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
@@ -642,6 +646,12 @@ libzfs_mnttab_fini(libzfs_handle_t *hdl)
 	avl_destroy(&hdl->libzfs_mnttab_cache);
 }
 
+void
+libzfs_mnttab_cache(libzfs_handle_t *hdl, boolean_t enable)
+{
+	hdl->libzfs_mnttab_enable = enable;
+}
+
 int
 libzfs_mnttab_find(libzfs_handle_t *hdl, const char *fsname,
     struct mnttab *entry)
@@ -649,8 +659,22 @@ libzfs_mnttab_find(libzfs_handle_t *hdl, const char *fsname,
 	mnttab_node_t find;
 	mnttab_node_t *mtn;
 
+	if (!hdl->libzfs_mnttab_enable) {
+		struct mnttab srch = { 0 };
+
+		if (avl_numnodes(&hdl->libzfs_mnttab_cache))
+			libzfs_mnttab_fini(hdl);
+		rewind(hdl->libzfs_mnttab);
+		srch.mnt_special = (char *)fsname;
+		srch.mnt_fstype = MNTTYPE_ZFS;
+		if (getmntany(hdl->libzfs_mnttab, entry, &srch) == 0)
+			return (0);
+		else
+			return (ENOENT);
+	}
+
 	if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0)
-		libzfs_mnttab_init(hdl);
+		libzfs_mnttab_update(hdl);
 
 	find.mtn_mt.mnt_special = (char *)fsname;
 	mtn = avl_find(&hdl->libzfs_mnttab_cache, &find, NULL);
diff --git a/usr/src/lib/libzfs/common/libzfs_impl.h b/usr/src/lib/libzfs/common/libzfs_impl.h
index 02411502ce..06fc366bc3 100644
--- a/usr/src/lib/libzfs/common/libzfs_impl.h
+++ b/usr/src/lib/libzfs/common/libzfs_impl.h
@@ -63,6 +63,7 @@ struct libzfs_handle {
 	int libzfs_printerr;
 	void *libzfs_sharehdl; /* libshare handle */
 	uint_t libzfs_shareflags;
+	boolean_t libzfs_mnttab_enable;
 	avl_tree_t libzfs_mnttab_cache;
 };
 #define	ZFSSHARE_MISS	0x01	/* Didn't find entry in cache */
diff --git a/usr/src/lib/libzfs/common/libzfs_util.c b/usr/src/lib/libzfs/common/libzfs_util.c
index 259f5fd496..1cc689994b 100644
--- a/usr/src/lib/libzfs/common/libzfs_util.c
+++ b/usr/src/lib/libzfs/common/libzfs_util.c
@@ -19,7 +19,7 @@
  * CDDL HEADER END
  */
 /*
- * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
@@ -575,6 +575,7 @@ libzfs_init(void)
 
 	zfs_prop_init();
 	zpool_prop_init();
+	libzfs_mnttab_init(hdl);
 
 	return (hdl);
 }
@@ -592,6 +593,7 @@ libzfs_fini(libzfs_handle_t *hdl)
 		(void) free(hdl->libzfs_log_str);
 	zpool_free_handles(hdl);
 	namespace_clear(hdl);
+	libzfs_mnttab_fini(hdl);
 	free(hdl);
 }
 
diff --git a/usr/src/lib/libzfs/common/mapfile-vers b/usr/src/lib/libzfs/common/mapfile-vers
index 030bd12a91..37af76d16b 100644
--- a/usr/src/lib/libzfs/common/mapfile-vers
+++ b/usr/src/lib/libzfs/common/mapfile-vers
@@ -44,6 +44,7 @@ SUNWprivate_1.1 {
 	libzfs_error_description;
 	libzfs_fini;
 	libzfs_init;
+	libzfs_mnttab_cache;
 	libzfs_print_on_error;
 	zfs_allocatable_devs;
 	zfs_build_perms;