--- a/usr/src/cmd/zpool/zpool_main.c	Mon Nov 24 14:54:57 2008 -0800
+++ b/usr/src/cmd/zpool/zpool_main.c	Mon Nov 24 16:10:21 2008 -0800
@@ -877,17 +877,21 @@
 zpool_do_export(int argc, char **argv)
 {
 	boolean_t force = B_FALSE;
+	boolean_t hardforce = B_FALSE;
 	int c;
 	zpool_handle_t *zhp;
 	int ret;
 	int i;
 
 	/* check options */
-	while ((c = getopt(argc, argv, "f")) != -1) {
+	while ((c = getopt(argc, argv, "fF")) != -1) {
 		switch (c) {
 		case 'f':
 			force = B_TRUE;
 			break;
+		case 'F':
+			hardforce = B_TRUE;
+			break;
 		case '?':
 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
 			    optopt);
@@ -917,8 +921,12 @@
 			continue;
 		}
 
-		if (zpool_export(zhp, force) != 0)
+		if (hardforce) {
+			if (zpool_export_force(zhp) != 0)
+				ret = 1;
+		} else if (zpool_export(zhp, force) != 0) {
 			ret = 1;
+		}
 
 		zpool_close(zhp);
 	}

--- a/usr/src/cmd/ztest/ztest.c	Mon Nov 24 14:54:57 2008 -0800
+++ b/usr/src/cmd/ztest/ztest.c	Mon Nov 24 16:10:21 2008 -0800
@@ -2883,7 +2883,7 @@
 	/*
 	 * Export it.
 	 */
-	error = spa_export(oldname, &config, B_FALSE);
+	error = spa_export(oldname, &config, B_FALSE, B_FALSE);
 	if (error)
 		fatal(0, "spa_export('%s') = %d", oldname, error);
 

--- a/usr/src/lib/libzfs/common/libzfs.h	Mon Nov 24 14:54:57 2008 -0800
+++ b/usr/src/lib/libzfs/common/libzfs.h	Mon Nov 24 16:10:21 2008 -0800
@@ -289,6 +289,7 @@
  * Import and export functions
  */
 extern int zpool_export(zpool_handle_t *, boolean_t);
+extern int zpool_export_force(zpool_handle_t *);
 extern int zpool_import(libzfs_handle_t *, nvlist_t *, const char *,
     char *altroot);
 extern int zpool_import_props(libzfs_handle_t *, nvlist_t *, const char *,

--- a/usr/src/lib/libzfs/common/libzfs_pool.c	Mon Nov 24 14:54:57 2008 -0800
+++ b/usr/src/lib/libzfs/common/libzfs_pool.c	Mon Nov 24 16:10:21 2008 -0800
@@ -1127,7 +1127,7 @@
  * mounted datasets in the pool.
  */
 int
-zpool_export(zpool_handle_t *zhp, boolean_t force)
+zpool_export_common(zpool_handle_t *zhp, boolean_t force, boolean_t hardforce)
 {
 	zfs_cmd_t zc = { 0 };
 	char msg[1024];
@@ -1140,6 +1140,7 @@
 
 	(void) strlcpy(zc.zc_name, zhp->zpool_name, sizeof (zc.zc_name));
 	zc.zc_cookie = force;
+	zc.zc_guid = hardforce;
 
 	if (zfs_ioctl(zhp->zpool_hdl, ZFS_IOC_POOL_EXPORT, &zc) != 0) {
 		switch (errno) {
@@ -1160,6 +1161,18 @@
 	return (0);
 }
 
+int
+zpool_export(zpool_handle_t *zhp, boolean_t force)
+{
+	return (zpool_export_common(zhp, force, B_FALSE));
+}
+
+int
+zpool_export_force(zpool_handle_t *zhp)
+{
+	return (zpool_export_common(zhp, B_TRUE, B_TRUE));
+}
+
 /*
  * zpool_import() is a contracted interface. Should be kept the same
  * if possible.

--- a/usr/src/lib/libzfs/common/mapfile-vers	Mon Nov 24 14:54:57 2008 -0800
+++ b/usr/src/lib/libzfs/common/mapfile-vers	Mon Nov 24 16:10:21 2008 -0800
@@ -121,6 +121,7 @@
 	zpool_enable_datasets;
 	zpool_expand_proplist;
 	zpool_export;
+	zpool_export_force;
 	zpool_find_import;
 	zpool_find_import_activeok;
 	zpool_find_import_byguid;

--- a/usr/src/uts/common/fs/zfs/spa.c	Mon Nov 24 14:54:57 2008 -0800
+++ b/usr/src/uts/common/fs/zfs/spa.c	Mon Nov 24 16:10:21 2008 -0800
@@ -2563,11 +2563,12 @@
  * The act of destroying or exporting a pool is very simple.  We make sure there
  * is no more pending I/O and any references to the pool are gone.  Then, we
  * update the pool state and sync all the labels to disk, removing the
- * configuration from the cache afterwards.
+ * configuration from the cache afterwards. If the 'hardforce' flag is set, then
+ * we don't sync the labels or remove the configuration cache.
  */
 static int
 spa_export_common(char *pool, int new_state, nvlist_t **oldconfig,
-    boolean_t force)
+    boolean_t force, boolean_t hardforce)
 {
 	spa_t *spa;
 
@@ -2635,7 +2636,7 @@
 		 * so mark them all dirty.  spa_unload() will do the
 		 * final sync that pushes these changes out.
 		 */
-		if (new_state != POOL_STATE_UNINITIALIZED) {
+		if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) {
 			spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
 			spa->spa_state = new_state;
 			spa->spa_final_txg = spa_last_synced_txg(spa) + 1;
@@ -2655,7 +2656,8 @@
 		VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0);
 
 	if (new_state != POOL_STATE_UNINITIALIZED) {
-		spa_config_sync(spa, B_TRUE, B_TRUE);
+		if (!hardforce)
+			spa_config_sync(spa, B_TRUE, B_TRUE);
 		spa_remove(spa);
 	}
 	mutex_exit(&spa_namespace_lock);
@@ -2669,16 +2671,19 @@
 int
 spa_destroy(char *pool)
 {
-	return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL, B_FALSE));
+	return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL,
+	    B_FALSE, B_FALSE));
 }
 
 /*
  * Export a storage pool.
  */
 int
-spa_export(char *pool, nvlist_t **oldconfig, boolean_t force)
+spa_export(char *pool, nvlist_t **oldconfig, boolean_t force,
+    boolean_t hardforce)
 {
-	return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig, force));
+	return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig,
+	    force, hardforce));
 }
 
 /*
@@ -2689,7 +2694,7 @@
 spa_reset(char *pool)
 {
 	return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL,
-	    B_FALSE));
+	    B_FALSE, B_FALSE));
 }
 
 /*

--- a/usr/src/uts/common/fs/zfs/sys/spa.h	Mon Nov 24 14:54:57 2008 -0800
+++ b/usr/src/uts/common/fs/zfs/sys/spa.h	Mon Nov 24 16:10:21 2008 -0800
@@ -332,7 +332,8 @@
 extern int spa_import_faulted(const char *, nvlist_t *, nvlist_t *);
 extern nvlist_t *spa_tryimport(nvlist_t *tryconfig);
 extern int spa_destroy(char *pool);
-extern int spa_export(char *pool, nvlist_t **oldconfig, boolean_t force);
+extern int spa_export(char *pool, nvlist_t **oldconfig, boolean_t force,
+    boolean_t hardforce);
 extern int spa_reset(char *pool);
 extern void spa_async_request(spa_t *spa, int flag);
 extern void spa_async_unrequest(spa_t *spa, int flag);

--- a/usr/src/uts/common/fs/zfs/zfs_ioctl.c	Mon Nov 24 14:54:57 2008 -0800
+++ b/usr/src/uts/common/fs/zfs/zfs_ioctl.c	Mon Nov 24 16:10:21 2008 -0800
@@ -856,9 +856,10 @@
 {
 	int error;
 	boolean_t force = (boolean_t)zc->zc_cookie;
+	boolean_t hardforce = (boolean_t)zc->zc_guid;
 
 	zfs_log_history(zc);
-	error = spa_export(zc->zc_name, NULL, force);
+	error = spa_export(zc->zc_name, NULL, force, hardforce);
 	return (error);
 }