4 files changed, 268 insertions, 175 deletions

diff --git a/cmd/zdb/zdb.c b/cmd/zdb/zdb.c
index 55a6c4fa1..21f8ea87c 100644
--- a/cmd/zdb/zdb.c
+++ b/cmd/zdb/zdb.c
@@ -2165,6 +2165,13 @@ dump_uberblock(uberblock_t *ub, const char *header, const char *footer)
 	(void) printf("\tguid_sum = %llu\n", (u_longlong_t)ub->ub_guid_sum);
 	(void) printf("\ttimestamp = %llu UTC = %s",
 	    (u_longlong_t)ub->ub_timestamp, asctime(localtime(&timestamp)));
+
+	(void) printf("\tmmp_magic = %016llx\n",
+	    (u_longlong_t)ub->ub_mmp_magic);
+	if (ub->ub_mmp_magic == MMP_MAGIC)
+		(void) printf("\tmmp_delay = %0llu\n",
+		    (u_longlong_t)ub->ub_mmp_delay);
+
 	if (dump_opt['u'] >= 4) {
 		char blkbuf[BP_SPRINTF_LEN];
 		snprintf_blkptr(blkbuf, sizeof (blkbuf), &ub->ub_rootbp);
@@ -2529,6 +2536,11 @@ dump_label_uberblocks(label_t *label, uint64_t ashift, int label_num)
 		if ((dump_opt['u'] < 3) && (first_label(rec) != label_num))
 			continue;
 
+		if ((dump_opt['u'] < 4) &&
+		    (ub->ub_mmp_magic == MMP_MAGIC) && ub->ub_mmp_delay &&
+		    (i >= VDEV_UBERBLOCK_COUNT(&vd) - MMP_BLOCKS_PER_LABEL))
+			continue;
+
 		print_label_header(label, label_num);
 		(void) snprintf(header, ZDB_MAX_UB_HEADER_SIZE,
 		    "    Uberblock[%d]\n", i);
@@ -4125,89 +4137,6 @@ zdb_embedded_block(char *thing)
 	zdb_dump_block_raw(buf, BPE_GET_LSIZE(&bp), 0);
 }
 
-static boolean_t
-pool_match(nvlist_t *cfg, char *tgt)
-{
-	uint64_t v, guid = strtoull(tgt, NULL, 0);
-	char *s;
-
-	if (guid != 0) {
-		if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_GUID, &v) == 0)
-			return (v == guid);
-	} else {
-		if (nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &s) == 0)
-			return (strcmp(s, tgt) == 0);
-	}
-	return (B_FALSE);
-}
-
-static char *
-find_zpool(char **target, nvlist_t **configp, int dirc, char **dirv)
-{
-	nvlist_t *pools;
-	nvlist_t *match = NULL;
-	char *name = NULL;
-	char *sepp = NULL;
-	char sep = '\0';
-	int count = 0;
-	importargs_t args = { 0 };
-
-	args.paths = dirc;
-	args.path = dirv;
-	args.can_be_active = B_TRUE;
-
-	if ((sepp = strpbrk(*target, "/@")) != NULL) {
-		sep = *sepp;
-		*sepp = '\0';
-	}
-
-	pools = zpool_search_import(g_zfs, &args);
-
-	if (pools != NULL) {
-		nvpair_t *elem = NULL;
-		while ((elem = nvlist_next_nvpair(pools, elem)) != NULL) {
-			verify(nvpair_value_nvlist(elem, configp) == 0);
-			if (pool_match(*configp, *target)) {
-				count++;
-				if (match != NULL) {
-					/* print previously found config */
-					if (name != NULL) {
-						(void) printf("%s\n", name);
-						dump_nvlist(match, 8);
-						name = NULL;
-					}
-					(void) printf("%s\n",
-					    nvpair_name(elem));
-					dump_nvlist(*configp, 8);
-				} else {
-					match = *configp;
-					name = nvpair_name(elem);
-				}
-			}
-		}
-	}
-	if (count > 1)
-		(void) fatal("\tMatched %d pools - use pool GUID "
-		    "instead of pool name or \n"
-		    "\tpool name part of a dataset name to select pool", count);
-
-	if (sepp)
-		*sepp = sep;
-	/*
-	 * If pool GUID was specified for pool id, replace it with pool name
-	 */
-	if (name && (strstr(*target, name) != *target)) {
-		int sz = 1 + strlen(name) + ((sepp) ? strlen(sepp) : 0);
-
-		*target = umem_alloc(sz, UMEM_NOFAIL);
-		(void) snprintf(*target, sz, "%s%s", name, sepp ? sepp : "");
-	}
-
-	*configp = name ? match : NULL;
-
-	return (name);
-}
-
 int
 main(int argc, char **argv)
 {
@@ -4424,21 +4353,31 @@ main(int argc, char **argv)
 	target = argv[0];
 
 	if (dump_opt['e']) {
+		importargs_t args = { 0 };
 		nvlist_t *cfg = NULL;
-		char *name = find_zpool(&target, &cfg, nsearch, searchdirs);
 
-		error = ENOENT;
-		if (name) {
-			if (dump_opt['C'] > 1) {
-				(void) printf("\nConfiguration for import:\n");
-				dump_nvlist(cfg, 8);
-			}
+		args.paths = nsearch;
+		args.path = searchdirs;
+		args.can_be_active = B_TRUE;
+
+		error = zpool_tryimport(g_zfs, target, &cfg, &args);
+		if (error == 0) {
 			if (nvlist_add_nvlist(cfg,
 			    ZPOOL_REWIND_POLICY, policy) != 0) {
 				fatal("can't open '%s': %s",
 				    target, strerror(ENOMEM));
 			}
-			error = spa_import(name, cfg, NULL, flags);
+
+			/*
+			 * Disable the activity check to allow examination of
+			 * active pools.
+			 */
+			if (dump_opt['C'] > 1) {
+				(void) printf("\nConfiguration for import:\n");
+				dump_nvlist(cfg, 8);
+			}
+			error = spa_import(target, cfg, NULL,
+			    flags | ZFS_IMPORT_SKIP_MMP);
 		}
 	}
 
@@ -4453,6 +4392,16 @@ main(int argc, char **argv)
 
 	if (error == 0) {
 		if (target_is_spa || dump_opt['R']) {
+			/*
+			 * Disable the activity check to allow examination of
+			 * active pools.
+			 */
+			mutex_enter(&spa_namespace_lock);
+			if ((spa = spa_lookup(target)) != NULL) {
+				spa->spa_import_flags |= ZFS_IMPORT_SKIP_MMP;
+			}
+			mutex_exit(&spa_namespace_lock);
+
 			error = spa_open_rewind(target, &spa, FTAG, policy,
 			    NULL);
 			if (error) {
diff --git a/cmd/zhack/zhack.c b/cmd/zhack/zhack.c
index e76945141..cc414dae1 100644
--- a/cmd/zhack/zhack.c
+++ b/cmd/zhack/zhack.c
@@ -121,16 +121,11 @@ space_delta_cb(dmu_object_type_t bonustype, void *data,
  * Target is the dataset whose pool we want to open.
  */
 static void
-import_pool(const char *target, boolean_t readonly)
+zhack_import(char *target, boolean_t readonly)
 {
 	nvlist_t *config;
-	nvlist_t *pools;
-	int error;
-	char *sepp;
-	spa_t *spa;
-	nvpair_t *elem;
 	nvlist_t *props;
-	char *name;
+	int error;
 
 	kernel_init(readonly ? FREAD : (FREAD | FWRITE));
 	g_zfs = libzfs_init();
@@ -139,43 +134,14 @@ import_pool(const char *target, boolean_t readonly)
 	dmu_objset_register_type(DMU_OST_ZFS, space_delta_cb);
 
 	g_readonly = readonly;
-
-	/*
-	 * If we only want readonly access, it's OK if we find
-	 * a potentially-active (ie, imported into the kernel) pool from the
-	 * default cachefile.
-	 */
-	if (readonly && spa_open(target, &spa, FTAG) == 0) {
-		spa_close(spa, FTAG);
-		return;
-	}
-
 	g_importargs.unique = B_TRUE;
 	g_importargs.can_be_active = readonly;
 	g_pool = strdup(target);
-	if ((sepp = strpbrk(g_pool, "/@")) != NULL)
-		*sepp = '\0';
-	g_importargs.poolname = g_pool;
-	pools = zpool_search_import(g_zfs, &g_importargs);
-
-	if (nvlist_empty(pools)) {
-		if (!g_importargs.can_be_active) {
-			g_importargs.can_be_active = B_TRUE;
-			if (zpool_search_import(g_zfs, &g_importargs) != NULL ||
-			    spa_open(target, &spa, FTAG) == 0) {
-				fatal(spa, FTAG, "cannot import '%s': pool is "
-				    "active; run " "\"zpool export %s\" "
-				    "first\n", g_pool, g_pool);
-			}
-		}
 
-		fatal(NULL, FTAG, "cannot import '%s': no such pool "
-		    "available\n", g_pool);
-	}
-
-	elem = nvlist_next_nvpair(pools, NULL);
-	name = nvpair_name(elem);
-	VERIFY(nvpair_value_nvlist(elem, &config) == 0);
+	error = zpool_tryimport(g_zfs, target, &config, &g_importargs);
+	if (error)
+		fatal(NULL, FTAG, "cannot import '%s': %s", target,
+		    libzfs_error_description(g_zfs));
 
 	props = NULL;
 	if (readonly) {
@@ -185,22 +151,22 @@ import_pool(const char *target, boolean_t readonly)
 	}
 
 	zfeature_checks_disable = B_TRUE;
-	error = spa_import(name, config, props, ZFS_IMPORT_NORMAL);
+	error = spa_import(target, config, props, ZFS_IMPORT_NORMAL);
 	zfeature_checks_disable = B_FALSE;
 	if (error == EEXIST)
 		error = 0;
 
 	if (error)
-		fatal(NULL, FTAG, "can't import '%s': %s", name,
+		fatal(NULL, FTAG, "can't import '%s': %s", target,
 		    strerror(error));
 }
 
 static void
-zhack_spa_open(const char *target, boolean_t readonly, void *tag, spa_t **spa)
+zhack_spa_open(char *target, boolean_t readonly, void *tag, spa_t **spa)
 {
 	int err;
 
-	import_pool(target, readonly);
+	zhack_import(target, readonly);
 
 	zfeature_checks_disable = B_TRUE;
 	err = spa_open(target, spa, tag);
diff --git a/cmd/zpool/zpool_main.c b/cmd/zpool/zpool_main.c
index 14181b083..052b429cc 100644
--- a/cmd/zpool/zpool_main.c
+++ b/cmd/zpool/zpool_main.c
@@ -1743,6 +1743,9 @@ print_status_config(zpool_handle_t *zhp, status_cbdata_t *cb, const char *name,
 			(void) printf(gettext("split into new pool"));
 			break;
 
+		case VDEV_AUX_ACTIVE:
+			(void) printf(gettext("currently in use"));
+
 		default:
 			(void) printf(gettext("corrupted data"));
 			break;
@@ -1838,6 +1841,10 @@ print_import_config(status_cbdata_t *cb, const char *name, nvlist_t *nv,
 			(void) printf(gettext("too many errors"));
 			break;
 
+		case VDEV_AUX_ACTIVE:
+			(void) printf(gettext("currently in use"));
+			break;
+
 		default:
 			(void) printf(gettext("corrupted data"));
 			break;
@@ -1935,8 +1942,10 @@ show_import(nvlist_t *config)
 	vdev_stat_t *vs;
 	char *name;
 	uint64_t guid;
+	uint64_t hostid = 0;
 	char *msgid;
-	nvlist_t *nvroot;
+	char *hostname = "unknown";
+	nvlist_t *nvroot, *nvinfo;
 	zpool_status_t reason;
 	zpool_errata_t errata;
 	const char *health;
@@ -2024,6 +2033,17 @@ show_import(nvlist_t *config)
 		zpool_print_unsup_feat(config);
 		break;
 
+	case ZPOOL_STATUS_HOSTID_ACTIVE:
+		(void) printf(gettext(" status: The pool is currently "
+		    "imported by another system.\n"));
+		break;
+
+	case ZPOOL_STATUS_HOSTID_REQUIRED:
+		(void) printf(gettext(" status: The pool has the "
+		    "multihost property on.  It cannot\n\tbe safely imported "
+		    "when the system hostid is not set.\n"));
+		break;
+
 	case ZPOOL_STATUS_HOSTID_MISMATCH:
 		(void) printf(gettext(" status: The pool was last accessed by "
 		    "another system.\n"));
@@ -2137,6 +2157,27 @@ show_import(nvlist_t *config)
 			    "imported. Attach the missing\n\tdevices and try "
 			    "again.\n"));
 			break;
+		case ZPOOL_STATUS_HOSTID_ACTIVE:
+			VERIFY0(nvlist_lookup_nvlist(config,
+			    ZPOOL_CONFIG_LOAD_INFO, &nvinfo));
+
+			if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_HOSTNAME))
+				hostname = fnvlist_lookup_string(nvinfo,
+				    ZPOOL_CONFIG_MMP_HOSTNAME);
+
+			if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_HOSTID))
+				hostid = fnvlist_lookup_uint64(nvinfo,
+				    ZPOOL_CONFIG_MMP_HOSTID);
+
+			(void) printf(gettext(" action: The pool must be "
+			    "exported from %s (hostid=%lx)\n\tbefore it "
+			    "can be safely imported.\n"), hostname,
+			    (unsigned long) hostid);
+			break;
+		case ZPOOL_STATUS_HOSTID_REQUIRED:
+			(void) printf(gettext(" action: Set a unique system "
+			    "hostid with the genhostid(1) command.\n"));
+			break;
 		default:
 			(void) printf(gettext(" action: The pool cannot be "
 			    "imported due to damaged devices or data.\n"));
@@ -2184,6 +2225,31 @@ show_import(nvlist_t *config)
 	}
 }
 
+static boolean_t
+zfs_force_import_required(nvlist_t *config)
+{
+	uint64_t state;
+	uint64_t hostid = 0;
+	nvlist_t *nvinfo;
+
+	state = fnvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE);
+	(void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_HOSTID, &hostid);
+
+	if (state != POOL_STATE_EXPORTED && hostid != get_system_hostid())
+		return (B_TRUE);
+
+	nvinfo = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO);
+	if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_STATE)) {
+		mmp_state_t mmp_state = fnvlist_lookup_uint64(nvinfo,
+		    ZPOOL_CONFIG_MMP_STATE);
+
+		if (mmp_state != MMP_STATE_INACTIVE)
+			return (B_TRUE);
+	}
+
+	return (B_FALSE);
+}
+
 /*
  * Perform the import for the given configuration.  This passes the heavy
  * lifting off to zpool_import_props(), and then mounts the datasets contained
@@ -2198,45 +2264,72 @@ do_import(nvlist_t *config, const char *newname, const char *mntopts,
 	uint64_t state;
 	uint64_t version;
 
-	verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
-	    &name) == 0);
+	name = fnvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME);
+	state = fnvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE);
+	version = fnvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION);
 
-	verify(nvlist_lookup_uint64(config,
-	    ZPOOL_CONFIG_POOL_STATE, &state) == 0);
-	verify(nvlist_lookup_uint64(config,
-	    ZPOOL_CONFIG_VERSION, &version) == 0);
 	if (!SPA_VERSION_IS_SUPPORTED(version)) {
 		(void) fprintf(stderr, gettext("cannot import '%s': pool "
 		    "is formatted using an unsupported ZFS version\n"), name);
 		return (1);
-	} else if (state != POOL_STATE_EXPORTED &&
+	} else if (zfs_force_import_required(config) &&
 	    !(flags & ZFS_IMPORT_ANY_HOST)) {
-		uint64_t hostid = 0;
-		unsigned long system_hostid = get_system_hostid();
+		mmp_state_t mmp_state = MMP_STATE_INACTIVE;
+		nvlist_t *nvinfo;
 
-		(void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_HOSTID,
-		    &hostid);
+		nvinfo = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO);
+		if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_STATE))
+			mmp_state = fnvlist_lookup_uint64(nvinfo,
+			    ZPOOL_CONFIG_MMP_STATE);
 
-		if (hostid != 0 && (unsigned long)hostid != system_hostid) {
-			char *hostname;
-			uint64_t timestamp;
-			time_t t;
+		if (mmp_state == MMP_STATE_ACTIVE) {
+			char *hostname = "<unknown>";
+			uint64_t hostid = 0;
 
-			verify(nvlist_lookup_string(config,
-			    ZPOOL_CONFIG_HOSTNAME, &hostname) == 0);
-			verify(nvlist_lookup_uint64(config,
-			    ZPOOL_CONFIG_TIMESTAMP, &timestamp) == 0);
-			t = timestamp;
-			(void) fprintf(stderr, gettext("cannot import "
-			    "'%s': pool may be in use from other "
-			    "system, it was last accessed by %s "
-			    "(hostid: 0x%lx) on %s"), name, hostname,
-			    (unsigned long)hostid,
-			    asctime(localtime(&t)));
-			(void) fprintf(stderr, gettext("use '-f' to "
-			    "import anyway\n"));
-			return (1);
+			if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_HOSTNAME))
+				hostname = fnvlist_lookup_string(nvinfo,
+				    ZPOOL_CONFIG_MMP_HOSTNAME);
+
+			if (nvlist_exists(nvinfo, ZPOOL_CONFIG_MMP_HOSTID))
+				hostid = fnvlist_lookup_uint64(nvinfo,
+				    ZPOOL_CONFIG_MMP_HOSTID);
+
+			(void) fprintf(stderr, gettext("cannot import '%s': "
+			    "pool is imported on %s (hostid: "
+			    "0x%lx)\nExport the pool on the other system, "
+			    "then run 'zpool import'.\n"),
+			    name, hostname, (unsigned long) hostid);
+		} else if (mmp_state == MMP_STATE_NO_HOSTID) {
+			(void) fprintf(stderr, gettext("Cannot import '%s': "
+			    "pool has the multihost property on and the\n"
+			    "system's hostid is not set. Set a unique hostid "
+			    "with the genhostid(1) command.\n"), name);
+		} else {
+			char *hostname = "<unknown>";
+			uint64_t timestamp = 0;
+			uint64_t hostid = 0;
+
+			if (nvlist_exists(config, ZPOOL_CONFIG_HOSTNAME))
+				hostname = fnvlist_lookup_string(config,
+				    ZPOOL_CONFIG_HOSTNAME);
+
+			if (nvlist_exists(config, ZPOOL_CONFIG_TIMESTAMP))
+				timestamp = fnvlist_lookup_uint64(config,
+				    ZPOOL_CONFIG_TIMESTAMP);
+
+			if (nvlist_exists(config, ZPOOL_CONFIG_HOSTID))
+				hostid = fnvlist_lookup_uint64(config,
+				    ZPOOL_CONFIG_HOSTID);
+
+			(void) fprintf(stderr, gettext("cannot import '%s': "
+			    "pool was previously in use from another system.\n"
+			    "Last accessed by %s (hostid=%lx) at %s"
+			    "The pool can be imported, use 'zpool import -f' "
+			    "to import the pool.\n"), name, hostname,
+			    (unsigned long)hostid, ctime((time_t *)&timestamp));
 		}
+
+		return (1);
 	}
 
 	if (zpool_import_props(g_zfs, config, newname, props, flags) != 0)
diff --git a/cmd/ztest/ztest.c b/cmd/ztest/ztest.c
index d698628de..b4cedbdba 100644
--- a/cmd/ztest/ztest.c
+++ b/cmd/ztest/ztest.c
@@ -126,6 +126,7 @@
 #include <sys/fs/zfs.h>
 #include <zfs_fletcher.h>
 #include <libnvpair.h>
+#include <libzfs.h>
 #ifdef __GLIBC__
 #include <execinfo.h> /* for backtrace() */
 #endif
@@ -166,6 +167,7 @@ typedef struct ztest_shared_opts {
 	uint64_t zo_time;
 	uint64_t zo_maxloops;
 	uint64_t zo_metaslab_gang_bang;
+	int zo_mmp_test;
 } ztest_shared_opts_t;
 
 static const ztest_shared_opts_t ztest_opts_defaults = {
@@ -184,6 +186,7 @@ static const ztest_shared_opts_t ztest_opts_defaults = {
 	.zo_passtime = 60,		/* 60 seconds */
 	.zo_killrate = 70,		/* 70% kill rate */
 	.zo_verbose = 0,
+	.zo_mmp_test = 0,
 	.zo_init = 1,
 	.zo_time = 300,			/* 5 minutes */
 	.zo_maxloops = 50,		/* max loops during spa_freeze() */
@@ -623,6 +626,7 @@ usage(boolean_t requested)
 	    "\t[-k kill_percentage (default: %llu%%)]\n"
 	    "\t[-p pool_name (default: %s)]\n"
 	    "\t[-f dir (default: %s)] file directory for vdev files\n"
+	    "\t[-M] Multi-host simulate pool imported on remote host\n"
 	    "\t[-V] verbose (use multiple times for ever more blather)\n"
 	    "\t[-E] use existing pool instead of creating new one\n"
 	    "\t[-T time (default: %llu sec)] total run time\n"
@@ -666,7 +670,7 @@ process_options(int argc, char **argv)
 	bcopy(&ztest_opts_defaults, zo, sizeof (*zo));
 
 	while ((opt = getopt(argc, argv,
-	    "v:s:a:m:r:R:d:t:g:i:k:p:f:VET:P:hF:B:o:")) != EOF) {
+	    "v:s:a:m:r:R:d:t:g:i:k:p:f:MVET:P:hF:B:o:")) != EOF) {
 		value = 0;
 		switch (opt) {
 		case 'v':
@@ -736,6 +740,9 @@ process_options(int argc, char **argv)
 				free(path);
 			}
 			break;
+		case 'M':
+			zo->zo_mmp_test = 1;
+			break;
 		case 'V':
 			zo->zo_verbose++;
 			break;
@@ -2619,6 +2626,9 @@ ztest_spa_create_destroy(ztest_ds_t *zd, uint64_t id)
 	spa_t *spa;
 	nvlist_t *nvroot;
 
+	if (zo->zo_mmp_test)
+		return;
+
 	/*
 	 * Attempt to create using a bad file.
 	 */
@@ -2660,6 +2670,9 @@ ztest_spa_upgrade(ztest_ds_t *zd, uint64_t id)
 	nvlist_t *nvroot, *props;
 	char *name;
 
+	if (ztest_opts.zo_mmp_test)
+		return;
+
 	mutex_enter(&ztest_vdev_lock);
 	name = kmem_asprintf("%s_upgrade", ztest_opts.zo_pool);
 
@@ -2773,6 +2786,9 @@ ztest_vdev_add_remove(ztest_ds_t *zd, uint64_t id)
 	nvlist_t *nvroot;
 	int error;
 
+	if (ztest_opts.zo_mmp_test)
+		return;
+
 	mutex_enter(&ztest_vdev_lock);
 	leaves = MAX(zs->zs_mirrors + zs->zs_splits, 1) * ztest_opts.zo_raidz;
 
@@ -2844,6 +2860,9 @@ ztest_vdev_aux_add_remove(ztest_ds_t *zd, uint64_t id)
 	uint64_t guid = 0;
 	int error;
 
+	if (ztest_opts.zo_mmp_test)
+		return;
+
 	path = umem_alloc(MAXPATHLEN, UMEM_NOFAIL);
 
 	if (ztest_random(2) == 0) {
@@ -2929,6 +2948,9 @@ ztest_split_pool(ztest_ds_t *zd, uint64_t id)
 	uint_t c, children, schildren = 0, lastlogid = 0;
 	int error = 0;
 
+	if (ztest_opts.zo_mmp_test)
+		return;
+
 	mutex_enter(&ztest_vdev_lock);
 
 	/* ensure we have a useable config; mirrors of raidz aren't supported */
@@ -3036,6 +3058,9 @@ ztest_vdev_attach_detach(ztest_ds_t *zd, uint64_t id)
 	int oldvd_is_log;
 	int error, expected_error;
 
+	if (ztest_opts.zo_mmp_test)
+		return;
+
 	oldpath = umem_alloc(MAXPATHLEN, UMEM_NOFAIL);
 	newpath = umem_alloc(MAXPATHLEN, UMEM_NOFAIL);
 
@@ -5624,6 +5649,9 @@ ztest_spa_rename(ztest_ds_t *zd, uint64_t id)
 	char *oldname, *newname;
 	spa_t *spa;
 
+	if (ztest_opts.zo_mmp_test)
+		return;
+
 	(void) rw_wrlock(&ztest_name_lock);
 
 	oldname = ztest_opts.zo_pool;
@@ -6414,7 +6442,7 @@ ztest_run(ztest_shared_t *zs)
 	 * Verify that we can export the pool and reimport it under a
 	 * different name.
 	 */
-	if (ztest_random(2) == 0) {
+	if ((ztest_random(2) == 0) && !ztest_opts.zo_mmp_test) {
 		char name[ZFS_MAX_DATASET_NAME_LEN];
 		(void) snprintf(name, sizeof (name), "%s_import",
 		    ztest_opts.zo_pool);
@@ -6562,6 +6590,56 @@ make_random_props(void)
 }
 
 /*
+ * Import a storage pool with the given name.
+ */
+static void
+ztest_import(ztest_shared_t *zs)
+{
+	libzfs_handle_t *hdl;
+	importargs_t args = { 0 };
+	spa_t *spa;
+	nvlist_t *cfg = NULL;
+	int nsearch = 1;
+	char *searchdirs[nsearch];
+	char *name = ztest_opts.zo_pool;
+	int flags = ZFS_IMPORT_MISSING_LOG;
+	int error;
+
+	mutex_init(&ztest_vdev_lock, NULL, MUTEX_DEFAULT, NULL);
+	VERIFY(rwlock_init(&ztest_name_lock, USYNC_THREAD, NULL) == 0);
+
+	kernel_init(FREAD | FWRITE);
+	hdl = libzfs_init();
+
+	searchdirs[0] = ztest_opts.zo_dir;
+	args.paths = nsearch;
+	args.path = searchdirs;
+	args.can_be_active = B_FALSE;
+
+	error = zpool_tryimport(hdl, name, &cfg, &args);
+	if (error)
+		(void) fatal(0, "No pools found\n");
+
+	VERIFY0(spa_import(name, cfg, NULL, flags));
+	VERIFY0(spa_open(name, &spa, FTAG));
+	zs->zs_metaslab_sz =
+	    1ULL << spa->spa_root_vdev->vdev_child[0]->vdev_ms_shift;
+	spa_close(spa, FTAG);
+
+	libzfs_fini(hdl);
+	kernel_fini();
+
+	if (!ztest_opts.zo_mmp_test) {
+		ztest_run_zdb(ztest_opts.zo_pool);
+		ztest_freeze();
+		ztest_run_zdb(ztest_opts.zo_pool);
+	}
+
+	(void) rwlock_destroy(&ztest_name_lock);
+	mutex_destroy(&ztest_vdev_lock);
+}
+
+/*
  * Create a storage pool with the given name and initial vdev size.
  * Then test spa_freeze() functionality.
  */
@@ -6605,11 +6683,11 @@ ztest_init(ztest_shared_t *zs)
 
 	kernel_fini();
 
-	ztest_run_zdb(ztest_opts.zo_pool);
-
-	ztest_freeze();
-
-	ztest_run_zdb(ztest_opts.zo_pool);
+	if (!ztest_opts.zo_mmp_test) {
+		ztest_run_zdb(ztest_opts.zo_pool);
+		ztest_freeze();
+		ztest_run_zdb(ztest_opts.zo_pool);
+	}
 
 	(void) rwlock_destroy(&ztest_name_lock);
 	mutex_destroy(&ztest_vdev_lock);
@@ -6769,13 +6847,19 @@ ztest_run_init(void)
 
 	ztest_shared_t *zs = ztest_shared;
 
-	ASSERT(ztest_opts.zo_init != 0);
-
 	/*
 	 * Blow away any existing copy of zpool.cache
 	 */
 	(void) remove(spa_config_path);
 
+	if (ztest_opts.zo_init == 0) {
+		if (ztest_opts.zo_verbose >= 1)
+			(void) printf("Importing pool %s\n",
+			    ztest_opts.zo_pool);
+		ztest_import(zs);
+		return;
+	}
+
 	/*
 	 * Create and initialize our storage pool.
 	 */
@@ -7002,7 +7086,8 @@ main(int argc, char **argv)
 		}
 		kernel_fini();
 
-		ztest_run_zdb(ztest_opts.zo_pool);
+		if (!ztest_opts.zo_mmp_test)
+			ztest_run_zdb(ztest_opts.zo_pool);
 	}
 
 	if (ztest_opts.zo_verbose >= 1) {