--- a/usr/src/cmd/truss/codes.c	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/cmd/truss/codes.c	Wed Apr 22 14:55:27 2009 -0700
@@ -1021,6 +1021,8 @@
 		"zfs_cmd_t" },
 	{ (uint_t)ZFS_IOC_VDEV_SETPATH,		"ZFS_IOC_VDEV_SETPATH",
 		"zfs_cmd_t" },
+	{ (uint_t)ZFS_IOC_VDEV_SETFRU,		"ZFS_IOC_VDEV_SETFRU",
+		"zfs_cmd_t" },
 	{ (uint_t)ZFS_IOC_OBJSET_STATS,		"ZFS_IOC_OBJSET_STATS",
 		"zfs_cmd_t" },
 	{ (uint_t)ZFS_IOC_OBJSET_ZPLPROPS,	"ZFS_IOC_OBJSET_ZPLPROPS",

--- a/usr/src/cmd/zdb/zdb.c	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/cmd/zdb/zdb.c	Wed Apr 22 14:55:27 2009 -0700
@@ -2420,7 +2420,7 @@
 			}
 
 			if (error == 0)
-				error = spa_import_faulted(argv[0],
+				error = spa_import_verbatim(argv[0],
 				    exported_conf, nvl);
 
 			nvlist_free(nvl);

--- a/usr/src/uts/common/fs/zfs/spa.c	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/uts/common/fs/zfs/spa.c	Wed Apr 22 14:55:27 2009 -0700
@@ -828,6 +828,7 @@
 		}
 
 		vd->vdev_top = vd;
+		vd->vdev_aux = &spa->spa_spares;
 
 		if (vdev_open(vd) != 0)
 			continue;
@@ -1657,6 +1658,8 @@
 	uint_t vsc;
 	uint64_t pool;
 
+	ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER));
+
 	if (spa->spa_spares.sav_count == 0)
 		return;
 
@@ -1704,11 +1707,11 @@
 	vdev_stat_t *vs;
 	uint_t vsc;
 
+	ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER));
+
 	if (spa->spa_l2cache.sav_count == 0)
 		return;
 
-	spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
-
 	VERIFY(nvlist_lookup_nvlist(config,
 	    ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
 	VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config,
@@ -1742,8 +1745,6 @@
 			vdev_get_stats(vd, vs);
 		}
 	}
-
-	spa_config_exit(spa, SCL_CONFIG, FTAG);
 }
 
 int
@@ -1755,16 +1756,27 @@
 	*config = NULL;
 	error = spa_open_common(name, &spa, FTAG, config);
 
-	if (spa && *config != NULL) {
-		VERIFY(nvlist_add_uint64(*config, ZPOOL_CONFIG_ERRCOUNT,
-		    spa_get_errlog_size(spa)) == 0);
-
-		if (spa_suspended(spa))
+	if (spa != NULL) {
+		/*
+		 * This still leaves a window of inconsistency where the spares
+		 * or l2cache devices could change and the config would be
+		 * self-inconsistent.
+		 */
+		spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
+
+		if (*config != NULL) {
 			VERIFY(nvlist_add_uint64(*config,
-			    ZPOOL_CONFIG_SUSPENDED, spa->spa_failmode) == 0);
-
-		spa_add_spares(spa, *config);
-		spa_add_l2cache(spa, *config);
+			    ZPOOL_CONFIG_ERRCOUNT,
+			    spa_get_errlog_size(spa)) == 0);
+
+			if (spa_suspended(spa))
+				VERIFY(nvlist_add_uint64(*config,
+				    ZPOOL_CONFIG_SUSPENDED,
+				    spa->spa_failmode) == 0);
+
+			spa_add_spares(spa, *config);
+			spa_add_l2cache(spa, *config);
+		}
 	}
 
 	/*
@@ -1786,8 +1798,10 @@
 		}
 	}
 
-	if (spa != NULL)
+	if (spa != NULL) {
+		spa_config_exit(spa, SCL_CONFIG, FTAG);
 		spa_close(spa, FTAG);
+	}
 
 	return (error);
 }
@@ -2174,161 +2188,6 @@
 	return (0);
 }
 
-/*
- * Import the given pool into the system.  We set up the necessary spa_t and
- * then call spa_load() to do the dirty work.
- */
-static int
-spa_import_common(const char *pool, nvlist_t *config, nvlist_t *props,
-    boolean_t isroot, boolean_t allowfaulted)
-{
-	spa_t *spa;
-	char *altroot = NULL;
-	int error, loaderr;
-	nvlist_t *nvroot;
-	nvlist_t **spares, **l2cache;
-	uint_t nspares, nl2cache;
-
-	/*
-	 * If a pool with this name exists, return failure.
-	 */
-	mutex_enter(&spa_namespace_lock);
-	if ((spa = spa_lookup(pool)) != NULL) {
-		if (isroot) {
-			/*
-			 * Remove the existing root pool from the
-			 * namespace so that we can replace it with
-			 * the correct config we just read in.
-			 */
-			ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED);
-			spa_remove(spa);
-		} else {
-			mutex_exit(&spa_namespace_lock);
-			return (EEXIST);
-		}
-	}
-
-	/*
-	 * Create and initialize the spa structure.
-	 */
-	(void) nvlist_lookup_string(props,
-	    zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);
-	spa = spa_add(pool, altroot);
-	spa_activate(spa, spa_mode_global);
-
-	if (allowfaulted)
-		spa->spa_import_faulted = B_TRUE;
-	spa->spa_is_root = isroot;
-
-	/*
-	 * Pass off the heavy lifting to spa_load().
-	 * Pass TRUE for mosconfig (unless this is a root pool) because
-	 * the user-supplied config is actually the one to trust when
-	 * doing an import.
-	 */
-	loaderr = error = spa_load(spa, config, SPA_LOAD_IMPORT, !isroot);
-
-	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
-	/*
-	 * Toss any existing sparelist, as it doesn't have any validity anymore,
-	 * and conflicts with spa_has_spare().
-	 */
-	if (!isroot && spa->spa_spares.sav_config) {
-		nvlist_free(spa->spa_spares.sav_config);
-		spa->spa_spares.sav_config = NULL;
-		spa_load_spares(spa);
-	}
-	if (!isroot && spa->spa_l2cache.sav_config) {
-		nvlist_free(spa->spa_l2cache.sav_config);
-		spa->spa_l2cache.sav_config = NULL;
-		spa_load_l2cache(spa);
-	}
-
-	VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
-	    &nvroot) == 0);
-	if (error == 0)
-		error = spa_validate_aux(spa, nvroot, -1ULL, VDEV_ALLOC_SPARE);
-	if (error == 0)
-		error = spa_validate_aux(spa, nvroot, -1ULL,
-		    VDEV_ALLOC_L2CACHE);
-	spa_config_exit(spa, SCL_ALL, FTAG);
-
-	if (props != NULL)
-		spa_configfile_set(spa, props, B_FALSE);
-
-	if (error != 0 || (props && spa_writeable(spa) &&
-	    (error = spa_prop_set(spa, props)))) {
-		if (loaderr != 0 && loaderr != EINVAL && allowfaulted) {
-			/*
-			 * If we failed to load the pool, but 'allowfaulted' is
-			 * set, then manually set the config as if the config
-			 * passed in was specified in the cache file.
-			 */
-			error = 0;
-			spa->spa_import_faulted = B_FALSE;
-			if (spa->spa_config == NULL)
-				spa->spa_config = spa_config_generate(spa,
-				    NULL, -1ULL, B_TRUE);
-			spa_unload(spa);
-			spa_deactivate(spa);
-			spa_config_sync(spa, B_FALSE, B_TRUE);
-		} else {
-			spa_unload(spa);
-			spa_deactivate(spa);
-			spa_remove(spa);
-		}
-		mutex_exit(&spa_namespace_lock);
-		return (error);
-	}
-
-	/*
-	 * Override any spares and level 2 cache devices as specified by
-	 * the user, as these may have correct device names/devids, etc.
-	 */
-	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
-	    &spares, &nspares) == 0) {
-		if (spa->spa_spares.sav_config)
-			VERIFY(nvlist_remove(spa->spa_spares.sav_config,
-			    ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0);
-		else
-			VERIFY(nvlist_alloc(&spa->spa_spares.sav_config,
-			    NV_UNIQUE_NAME, KM_SLEEP) == 0);
-		VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config,
-		    ZPOOL_CONFIG_SPARES, spares, nspares) == 0);
-		spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
-		spa_load_spares(spa);
-		spa_config_exit(spa, SCL_ALL, FTAG);
-		spa->spa_spares.sav_sync = B_TRUE;
-	}
-	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
-	    &l2cache, &nl2cache) == 0) {
-		if (spa->spa_l2cache.sav_config)
-			VERIFY(nvlist_remove(spa->spa_l2cache.sav_config,
-			    ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0);
-		else
-			VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config,
-			    NV_UNIQUE_NAME, KM_SLEEP) == 0);
-		VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config,
-		    ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0);
-		spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
-		spa_load_l2cache(spa);
-		spa_config_exit(spa, SCL_ALL, FTAG);
-		spa->spa_l2cache.sav_sync = B_TRUE;
-	}
-
-	if (spa_writeable(spa)) {
-		/*
-		 * Update the config cache to include the newly-imported pool.
-		 */
-		spa_config_update_common(spa, SPA_CONFIG_UPDATE_POOL, isroot);
-	}
-
-	spa->spa_import_faulted = B_FALSE;
-	mutex_exit(&spa_namespace_lock);
-
-	return (0);
-}
-
 #ifdef _KERNEL
 /*
  * Build a "root" vdev for a top level vdev read in from a rootpool
@@ -2506,6 +2365,7 @@
 	nvlist_t *conf = NULL;
 	char *pname;
 	int error;
+	spa_t *spa;
 
 	/*
 	 * Get the vdev pathname and configuation from the most
@@ -2521,17 +2381,23 @@
 
 	VERIFY(nvlist_lookup_string(conf, ZPOOL_CONFIG_POOL_NAME, &pname) == 0);
 
-	/*
-	 * We specify 'allowfaulted' for this to be treated like spa_open()
-	 * instead of spa_import().  This prevents us from marking vdevs as
-	 * persistently unavailable, and generates FMA ereports as if it were a
-	 * pool open, not import.
-	 */
-	error = spa_import_common(pname, conf, NULL, B_TRUE, B_TRUE);
-	ASSERT(error != EEXIST);
+	mutex_enter(&spa_namespace_lock);
+	if ((spa = spa_lookup(pname)) != NULL) {
+		/*
+		 * Remove the existing root pool from the namespace so that we
+		 * can replace it with the correct config we just read in.
+		 */
+		spa_remove(spa);
+	}
+
+	spa = spa_add(pname, NULL);
+
+	spa->spa_is_root = B_TRUE;
+	VERIFY(nvlist_dup(conf, &spa->spa_config, 0) == 0);
+	mutex_exit(&spa_namespace_lock);
 
 	nvlist_free(conf);
-	return (error);
+	return (0);
 
 msg_out:
 	cmn_err(CE_NOTE, "\n"
@@ -2546,18 +2412,157 @@
 #endif
 
 /*
+ * Take a pool and insert it into the namespace as if it had been loaded at
+ * boot.
+ */
+int
+spa_import_verbatim(const char *pool, nvlist_t *config, nvlist_t *props)
+{
+	spa_t *spa;
+	char *altroot = NULL;
+
+	mutex_enter(&spa_namespace_lock);
+	if (spa_lookup(pool) != NULL) {
+		mutex_exit(&spa_namespace_lock);
+		return (EEXIST);
+	}
+
+	(void) nvlist_lookup_string(props,
+	    zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);
+	spa = spa_add(pool, altroot);
+
+	VERIFY(nvlist_dup(config, &spa->spa_config, 0) == 0);
+
+	if (props != NULL)
+		spa_configfile_set(spa, props, B_FALSE);
+
+	spa_config_sync(spa, B_FALSE, B_TRUE);
+
+	mutex_exit(&spa_namespace_lock);
+
+	return (0);
+}
+
+/*
  * Import a non-root pool into the system.
  */
 int
 spa_import(const char *pool, nvlist_t *config, nvlist_t *props)
 {
-	return (spa_import_common(pool, config, props, B_FALSE, B_FALSE));
-}
-
-int
-spa_import_faulted(const char *pool, nvlist_t *config, nvlist_t *props)
-{
-	return (spa_import_common(pool, config, props, B_FALSE, B_TRUE));
+	spa_t *spa;
+	char *altroot = NULL;
+	int error;
+	nvlist_t *nvroot;
+	nvlist_t **spares, **l2cache;
+	uint_t nspares, nl2cache;
+
+	/*
+	 * If a pool with this name exists, return failure.
+	 */
+	mutex_enter(&spa_namespace_lock);
+	if ((spa = spa_lookup(pool)) != NULL) {
+		mutex_exit(&spa_namespace_lock);
+		return (EEXIST);
+	}
+
+	/*
+	 * Create and initialize the spa structure.
+	 */
+	(void) nvlist_lookup_string(props,
+	    zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot);
+	spa = spa_add(pool, altroot);
+	spa_activate(spa, spa_mode_global);
+
+	/*
+	 * Pass off the heavy lifting to spa_load().  Pass TRUE for mosconfig
+	 * because the user-supplied config is actually the one to trust when
+	 * doing an import.
+	 */
+	error = spa_load(spa, config, SPA_LOAD_IMPORT, B_TRUE);
+
+	spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
+	/*
+	 * Toss any existing sparelist, as it doesn't have any validity
+	 * anymore, and conflicts with spa_has_spare().
+	 */
+	if (spa->spa_spares.sav_config) {
+		nvlist_free(spa->spa_spares.sav_config);
+		spa->spa_spares.sav_config = NULL;
+		spa_load_spares(spa);
+	}
+	if (spa->spa_l2cache.sav_config) {
+		nvlist_free(spa->spa_l2cache.sav_config);
+		spa->spa_l2cache.sav_config = NULL;
+		spa_load_l2cache(spa);
+	}
+
+	VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
+	    &nvroot) == 0);
+	if (error == 0)
+		error = spa_validate_aux(spa, nvroot, -1ULL,
+		    VDEV_ALLOC_SPARE);
+	if (error == 0)
+		error = spa_validate_aux(spa, nvroot, -1ULL,
+		    VDEV_ALLOC_L2CACHE);
+	spa_config_exit(spa, SCL_ALL, FTAG);
+
+	if (props != NULL)
+		spa_configfile_set(spa, props, B_FALSE);
+
+	if (error != 0 || (props && spa_writeable(spa) &&
+	    (error = spa_prop_set(spa, props)))) {
+		spa_unload(spa);
+		spa_deactivate(spa);
+		spa_remove(spa);
+		mutex_exit(&spa_namespace_lock);
+		return (error);
+	}
+
+	/*
+	 * Override any spares and level 2 cache devices as specified by
+	 * the user, as these may have correct device names/devids, etc.
+	 */
+	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
+	    &spares, &nspares) == 0) {
+		if (spa->spa_spares.sav_config)
+			VERIFY(nvlist_remove(spa->spa_spares.sav_config,
+			    ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0);
+		else
+			VERIFY(nvlist_alloc(&spa->spa_spares.sav_config,
+			    NV_UNIQUE_NAME, KM_SLEEP) == 0);
+		VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config,
+		    ZPOOL_CONFIG_SPARES, spares, nspares) == 0);
+		spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
+		spa_load_spares(spa);
+		spa_config_exit(spa, SCL_ALL, FTAG);
+		spa->spa_spares.sav_sync = B_TRUE;
+	}
+	if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
+	    &l2cache, &nl2cache) == 0) {
+		if (spa->spa_l2cache.sav_config)
+			VERIFY(nvlist_remove(spa->spa_l2cache.sav_config,
+			    ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0);
+		else
+			VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config,
+			    NV_UNIQUE_NAME, KM_SLEEP) == 0);
+		VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config,
+		    ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0);
+		spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
+		spa_load_l2cache(spa);
+		spa_config_exit(spa, SCL_ALL, FTAG);
+		spa->spa_l2cache.sav_sync = B_TRUE;
+	}
+
+	if (spa_writeable(spa)) {
+		/*
+		 * Update the config cache to include the newly-imported pool.
+		 */
+		spa_config_update_common(spa, SPA_CONFIG_UPDATE_POOL, B_FALSE);
+	}
+
+	mutex_exit(&spa_namespace_lock);
+
+	return (0);
 }
 
 
@@ -2643,8 +2648,10 @@
 		/*
 		 * Add the list of hot spares and level 2 cache devices.
 		 */
+		spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
 		spa_add_spares(spa, config);
 		spa_add_l2cache(spa, config);
+		spa_config_exit(spa, SCL_CONFIG, FTAG);
 	}
 
 	spa_unload(spa);
@@ -3058,8 +3065,11 @@
 	vdev_dtl_dirty(newvd, DTL_MISSING,
 	    TXG_INITIAL, open_txg - TXG_INITIAL + 1);
 
-	if (newvd->vdev_isspare)
+	if (newvd->vdev_isspare) {
 		spa_spare_activate(newvd);
+		spa_event_notify(spa, newvd, ESC_ZFS_VDEV_SPARE);
+	}
+
 	oldvdpath = spa_strdup(oldvd->vdev_path);
 	newvdpath = spa_strdup(newvd->vdev_path);
 	newvd_isspare = newvd->vdev_isspare;
@@ -3494,59 +3504,50 @@
 }
 
 /*
- * Update the stored path for this vdev.  Dirty the vdev configuration, relying
- * on spa_vdev_enter/exit() to synchronize the labels and cache.
+ * Update the stored path or FRU for this vdev.  Dirty the vdev configuration,
+ * relying on spa_vdev_enter/exit() to synchronize the labels and cache.
  */
 int
-spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath)
+spa_vdev_set_common(spa_t *spa, uint64_t guid, const char *value,
+    boolean_t ispath)
 {
 	vdev_t *vd;
 	uint64_t txg;
 
 	txg = spa_vdev_enter(spa);
 
-	if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) {
-		/*
-		 * Determine if this is a reference to a hot spare device.  If
-		 * it is, update the path manually as there is no associated
-		 * vdev_t that can be synced to disk.
-		 */
-		nvlist_t **spares;
-		uint_t i, nspares;
-
-		if (spa->spa_spares.sav_config != NULL) {
-			VERIFY(nvlist_lookup_nvlist_array(
-			    spa->spa_spares.sav_config, ZPOOL_CONFIG_SPARES,
-			    &spares, &nspares) == 0);
-			for (i = 0; i < nspares; i++) {
-				uint64_t theguid;
-				VERIFY(nvlist_lookup_uint64(spares[i],
-				    ZPOOL_CONFIG_GUID, &theguid) == 0);
-				if (theguid == guid) {
-					VERIFY(nvlist_add_string(spares[i],
-					    ZPOOL_CONFIG_PATH, newpath) == 0);
-					spa_load_spares(spa);
-					spa->spa_spares.sav_sync = B_TRUE;
-					return (spa_vdev_exit(spa, NULL, txg,
-					    0));
-				}
-			}
-		}
-
+	if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL)
 		return (spa_vdev_exit(spa, NULL, txg, ENOENT));
-	}
 
 	if (!vd->vdev_ops->vdev_op_leaf)
 		return (spa_vdev_exit(spa, NULL, txg, ENOTSUP));
 
-	spa_strfree(vd->vdev_path);
-	vd->vdev_path = spa_strdup(newpath);
+	if (ispath) {
+		spa_strfree(vd->vdev_path);
+		vd->vdev_path = spa_strdup(value);
+	} else {
+		if (vd->vdev_fru != NULL)
+			spa_strfree(vd->vdev_fru);
+		vd->vdev_fru = spa_strdup(value);
+	}
 
 	vdev_config_dirty(vd->vdev_top);
 
 	return (spa_vdev_exit(spa, NULL, txg, 0));
 }
 
+int
+spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath)
+{
+	return (spa_vdev_set_common(spa, guid, newpath, B_TRUE));
+}
+
+int
+spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru)
+{
+	return (spa_vdev_set_common(spa, guid, newfru, B_FALSE));
+}
+
 /*
  * ==========================================================================
  * SPA Scrubbing
@@ -4258,7 +4259,7 @@
 }
 
 vdev_t *
-spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t l2cache)
+spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux)
 {
 	vdev_t *vd;
 	int i;
@@ -4266,12 +4267,18 @@
 	if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL)
 		return (vd);
 
-	if (l2cache) {
+	if (aux) {
 		for (i = 0; i < spa->spa_l2cache.sav_count; i++) {
 			vd = spa->spa_l2cache.sav_vdevs[i];
 			if (vd->vdev_guid == guid)
 				return (vd);
 		}
+
+		for (i = 0; i < spa->spa_spares.sav_count; i++) {
+			vd = spa->spa_spares.sav_vdevs[i];
+			if (vd->vdev_guid == guid)
+				return (vd);
+		}
 	}
 
 	return (NULL);

--- a/usr/src/uts/common/fs/zfs/sys/spa.h	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/uts/common/fs/zfs/sys/spa.h	Wed Apr 22 14:55:27 2009 -0700
@@ -329,7 +329,7 @@
 extern boolean_t spa_rootdev_validate(nvlist_t *nv);
 extern int spa_import_rootpool(char *devpath, char *devid);
 extern int spa_import(const char *pool, nvlist_t *config, nvlist_t *props);
-extern int spa_import_faulted(const char *, nvlist_t *, nvlist_t *);
+extern int spa_import_verbatim(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,
@@ -356,6 +356,7 @@
     int replace_done);
 extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare);
 extern int spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath);
+extern int spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru);
 
 /* spare state (which is global across all pools) */
 extern void spa_spare_add(vdev_t *vd);

--- a/usr/src/uts/common/fs/zfs/sys/spa_impl.h	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/uts/common/fs/zfs/sys/spa_impl.h	Wed Apr 22 14:55:27 2009 -0700
@@ -165,7 +165,6 @@
 	kmutex_t	spa_suspend_lock;	/* protects suspend_zio_root */
 	kcondvar_t	spa_suspend_cv;		/* notification of resume */
 	uint8_t		spa_suspended;		/* pool is suspended */
-	boolean_t	spa_import_faulted;	/* allow faulted vdevs */
 	boolean_t	spa_is_root;		/* pool is root */
 	int		spa_minref;		/* num refs when first opened */
 	int		spa_mode;		/* FREAD | FWRITE */

--- a/usr/src/uts/common/fs/zfs/sys/vdev_impl.h	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/uts/common/fs/zfs/sys/vdev_impl.h	Wed Apr 22 14:55:27 2009 -0700
@@ -159,6 +159,7 @@
 	char		*vdev_path;	/* vdev path (if any)		*/
 	char		*vdev_devid;	/* vdev devid (if any)		*/
 	char		*vdev_physpath;	/* vdev device path (if any)	*/
+	char		*vdev_fru;	/* physical FRU location	*/
 	uint64_t	vdev_not_present; /* not present during import	*/
 	uint64_t	vdev_unspare;	/* unspare when resilvering done */
 	hrtime_t	vdev_last_try;	/* last reopen time		*/

--- a/usr/src/uts/common/fs/zfs/vdev.c	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/uts/common/fs/zfs/vdev.c	Wed Apr 22 14:55:27 2009 -0700
@@ -435,6 +435,8 @@
 	if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH,
 	    &vd->vdev_physpath) == 0)
 		vd->vdev_physpath = spa_strdup(vd->vdev_physpath);
+	if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0)
+		vd->vdev_fru = spa_strdup(vd->vdev_fru);
 
 	/*
 	 * Set the whole_disk property.  If it's not specified, leave the value
@@ -448,9 +450,8 @@
 	 * Look for the 'not present' flag.  This will only be set if the device
 	 * was not present at the time of import.
 	 */
-	if (!spa->spa_import_faulted)
-		(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT,
-		    &vd->vdev_not_present);
+	(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT,
+	    &vd->vdev_not_present);
 
 	/*
 	 * Get the alignment requirement.
@@ -560,6 +561,8 @@
 		spa_strfree(vd->vdev_devid);
 	if (vd->vdev_physpath)
 		spa_strfree(vd->vdev_physpath);
+	if (vd->vdev_fru)
+		spa_strfree(vd->vdev_fru);
 
 	if (vd->vdev_isspare)
 		spa_spare_remove(vd);
@@ -1257,6 +1260,7 @@
 	if (vd->vdev_aux) {
 		(void) vdev_validate_aux(vd);
 		if (vdev_readable(vd) && vdev_writeable(vd) &&
+		    vd->vdev_aux == &spa->spa_l2cache &&
 		    !l2arc_vdev_present(vd)) {
 			uint64_t size = vdev_get_rsize(vd);
 			l2arc_add_vdev(spa, vd,
@@ -2293,8 +2297,8 @@
 	int c;
 
 	/*
-	 * If this is an aux vdev (as with l2cache devices), then we update the
-	 * vdev config manually and set the sync flag.
+	 * If this is an aux vdev (as with l2cache and spare devices), then we
+	 * update the vdev config manually and set the sync flag.
 	 */
 	if (vd->vdev_aux != NULL) {
 		spa_aux_vdev_t *sav = vd->vdev_aux;
@@ -2316,8 +2320,11 @@
 
 		sav->sav_sync = B_TRUE;
 
-		VERIFY(nvlist_lookup_nvlist_array(sav->sav_config,
-		    ZPOOL_CONFIG_L2CACHE, &aux, &naux) == 0);
+		if (nvlist_lookup_nvlist_array(sav->sav_config,
+		    ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) {
+			VERIFY(nvlist_lookup_nvlist_array(sav->sav_config,
+			    ZPOOL_CONFIG_SPARES, &aux, &naux) == 0);
+		}
 
 		ASSERT(c < naux);
 
@@ -2523,7 +2530,6 @@
 		 * an error.
 		 */
 		if (spa->spa_load_state == SPA_LOAD_IMPORT &&
-		    !spa->spa_import_faulted &&
 		    vd->vdev_ops->vdev_op_leaf)
 			vd->vdev_not_present = 1;
 

--- a/usr/src/uts/common/fs/zfs/vdev_label.c	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/uts/common/fs/zfs/vdev_label.c	Wed Apr 22 14:55:27 2009 -0700
@@ -233,6 +233,10 @@
 		VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_PHYS_PATH,
 		    vd->vdev_physpath) == 0);
 
+	if (vd->vdev_fru != NULL)
+		VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_FRU,
+		    vd->vdev_fru) == 0);
+
 	if (vd->vdev_nparity != 0) {
 		ASSERT(strcmp(vd->vdev_ops->vdev_op_type,
 		    VDEV_TYPE_RAIDZ) == 0);

--- a/usr/src/uts/common/fs/zfs/zfs_fm.c	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/uts/common/fs/zfs/zfs_fm.c	Wed Apr 22 14:55:27 2009 -0700
@@ -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.
  */
 
@@ -96,7 +96,6 @@
 	nvlist_t *ereport, *detector;
 	uint64_t ena;
 	char class[64];
-	int state;
 
 	/*
 	 * If we are doing a spa_tryimport(), ignore errors.
@@ -129,16 +128,31 @@
 		if (zio->io_flags & ZIO_FLAG_SPECULATIVE)
 			return;
 
-		/*
-		 * If the vdev has already been marked as failing due to a
-		 * failed probe, then ignore any subsequent I/O errors, as the
-		 * DE will automatically fault the vdev on the first such
-		 * failure.
-		 */
-		if (vd != NULL &&
-		    (!vdev_readable(vd) || !vdev_writeable(vd)) &&
-		    strcmp(subclass, FM_EREPORT_ZFS_PROBE_FAILURE) != 0)
-			return;
+		if (vd != NULL) {
+			/*
+			 * If the vdev has already been marked as failing due
+			 * to a failed probe, then ignore any subsequent I/O
+			 * errors, as the DE will automatically fault the vdev
+			 * on the first such failure.  This also catches cases
+			 * where vdev_remove_wanted is set and the device has
+			 * not yet been asynchronously placed into the REMOVED
+			 * state.
+			 */
+			if (zio->io_vd == vd &&
+			    !vdev_accessible(vd, zio) &&
+			    strcmp(subclass, FM_EREPORT_ZFS_PROBE_FAILURE) != 0)
+				return;
+
+			/*
+			 * Ignore checksum errors for reads from DTL regions of
+			 * leaf vdevs.
+			 */
+			if (zio->io_type == ZIO_TYPE_READ &&
+			    zio->io_error == ECKSUM &&
+			    vd->vdev_ops->vdev_op_leaf &&
+			    vdev_dtl_contains(vd, DTL_MISSING, zio->io_txg, 1))
+				return;
+		}
 	}
 
 	if ((ereport = fm_nvlist_create(NULL)) == NULL)
@@ -189,21 +203,13 @@
 	 */
 
 	/*
-	 * If we are importing a faulted pool, then we treat it like an open,
-	 * not an import.  Otherwise, the DE will ignore all faults during
-	 * import, since the default behavior is to mark the devices as
-	 * persistently unavailable, not leave them in the faulted state.
-	 */
-	state = spa->spa_import_faulted ? SPA_LOAD_OPEN : spa->spa_load_state;
-
-	/*
 	 * Generic payload members common to all ereports.
 	 */
 	fm_payload_set(ereport, FM_EREPORT_PAYLOAD_ZFS_POOL,
 	    DATA_TYPE_STRING, spa_name(spa), FM_EREPORT_PAYLOAD_ZFS_POOL_GUID,
 	    DATA_TYPE_UINT64, spa_guid(spa),
 	    FM_EREPORT_PAYLOAD_ZFS_POOL_CONTEXT, DATA_TYPE_INT32,
-	    state, NULL);
+	    spa->spa_load_state, NULL);
 
 	if (spa != NULL) {
 		fm_payload_set(ereport, FM_EREPORT_PAYLOAD_ZFS_POOL_FAILMODE,
@@ -222,14 +228,18 @@
 		    DATA_TYPE_UINT64, vd->vdev_guid,
 		    FM_EREPORT_PAYLOAD_ZFS_VDEV_TYPE,
 		    DATA_TYPE_STRING, vd->vdev_ops->vdev_op_type, NULL);
-		if (vd->vdev_path)
+		if (vd->vdev_path != NULL)
 			fm_payload_set(ereport,
 			    FM_EREPORT_PAYLOAD_ZFS_VDEV_PATH,
 			    DATA_TYPE_STRING, vd->vdev_path, NULL);
-		if (vd->vdev_devid)
+		if (vd->vdev_devid != NULL)
 			fm_payload_set(ereport,
 			    FM_EREPORT_PAYLOAD_ZFS_VDEV_DEVID,
 			    DATA_TYPE_STRING, vd->vdev_devid, NULL);
+		if (vd->vdev_fru != NULL)
+			fm_payload_set(ereport,
+			    FM_EREPORT_PAYLOAD_ZFS_VDEV_FRU,
+			    DATA_TYPE_STRING, vd->vdev_fru, NULL);
 
 		if (pvd != NULL) {
 			fm_payload_set(ereport,

--- a/usr/src/uts/common/fs/zfs/zfs_ioctl.c	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/uts/common/fs/zfs/zfs_ioctl.c	Wed Apr 22 14:55:27 2009 -0700
@@ -981,7 +981,7 @@
 	    guid != zc->zc_guid)
 		error = EINVAL;
 	else if (zc->zc_cookie)
-		error = spa_import_faulted(zc->zc_name, config,
+		error = spa_import_verbatim(zc->zc_name, config,
 		    props);
 	else
 		error = spa_import(zc->zc_name, config, props);
@@ -1329,6 +1329,23 @@
 	return (error);
 }
 
+static int
+zfs_ioc_vdev_setfru(zfs_cmd_t *zc)
+{
+	spa_t *spa;
+	char *fru = zc->zc_value;
+	uint64_t guid = zc->zc_guid;
+	int error;
+
+	error = spa_open(zc->zc_name, &spa, FTAG);
+	if (error != 0)
+		return (error);
+
+	error = spa_vdev_setfru(spa, guid, fru);
+	spa_close(spa, FTAG);
+	return (error);
+}
+
 /*
  * inputs:
  * zc_name		name of filesystem
@@ -3451,6 +3468,8 @@
 	    B_TRUE },
 	{ zfs_ioc_vdev_setpath,	zfs_secpolicy_config, POOL_NAME, B_FALSE,
 	    B_TRUE },
+	{ zfs_ioc_vdev_setfru,	zfs_secpolicy_config, POOL_NAME, B_FALSE,
+	    B_TRUE },
 	{ zfs_ioc_objset_stats,	zfs_secpolicy_read, DATASET_NAME, B_FALSE,
 	    B_FALSE },
 	{ zfs_ioc_objset_zplprops, zfs_secpolicy_read, DATASET_NAME, B_FALSE,

--- a/usr/src/uts/common/sys/fm/fs/zfs.h	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/uts/common/sys/fm/fs/zfs.h	Wed Apr 22 14:55:27 2009 -0700
@@ -19,15 +19,13 @@
  * 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.
  */
 
 #ifndef	_SYS_FM_FS_ZFS_H
 #define	_SYS_FM_FS_ZFS_H
 
-#pragma ident	"%Z%%M%	%I%	%E% SMI"
-
 #ifdef	__cplusplus
 extern "C" {
 #endif
@@ -57,6 +55,7 @@
 #define	FM_EREPORT_PAYLOAD_ZFS_VDEV_TYPE	"vdev_type"
 #define	FM_EREPORT_PAYLOAD_ZFS_VDEV_PATH	"vdev_path"
 #define	FM_EREPORT_PAYLOAD_ZFS_VDEV_DEVID	"vdev_devid"
+#define	FM_EREPORT_PAYLOAD_ZFS_VDEV_FRU		"vdev_fru"
 #define	FM_EREPORT_PAYLOAD_ZFS_PARENT_GUID	"parent_guid"
 #define	FM_EREPORT_PAYLOAD_ZFS_PARENT_TYPE	"parent_type"
 #define	FM_EREPORT_PAYLOAD_ZFS_PARENT_PATH	"parent_path"

--- a/usr/src/uts/common/sys/fs/zfs.h	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/uts/common/sys/fs/zfs.h	Wed Apr 22 14:55:27 2009 -0700
@@ -388,6 +388,7 @@
 #define	ZPOOL_CONFIG_FAULTED		"faulted"
 #define	ZPOOL_CONFIG_DEGRADED		"degraded"
 #define	ZPOOL_CONFIG_REMOVED		"removed"
+#define	ZPOOL_CONFIG_FRU		"fru"
 
 #define	VDEV_TYPE_ROOT			"root"
 #define	VDEV_TYPE_MIRROR		"mirror"
@@ -558,6 +559,7 @@
 	ZFS_IOC_VDEV_ATTACH,
 	ZFS_IOC_VDEV_DETACH,
 	ZFS_IOC_VDEV_SETPATH,
+	ZFS_IOC_VDEV_SETFRU,
 	ZFS_IOC_OBJSET_STATS,
 	ZFS_IOC_OBJSET_ZPLPROPS,
 	ZFS_IOC_DATASET_LIST_NEXT,

--- a/usr/src/uts/common/sys/sysevent/eventdefs.h	Wed Apr 22 13:12:34 2009 -0700
+++ b/usr/src/uts/common/sys/sysevent/eventdefs.h	Wed Apr 22 14:55:27 2009 -0700
@@ -247,6 +247,7 @@
 #define	ESC_ZFS_CONFIG_SYNC	"ESC_ZFS_config_sync"
 #define	ESC_ZFS_SCRUB_START	"ESC_ZFS_scrub_start"
 #define	ESC_ZFS_SCRUB_FINISH	"ESC_ZFS_scrub_finish"
+#define	ESC_ZFS_VDEV_SPARE	"ESC_ZFS_vdev_spare"
 
 /*
  * datalink subclass definitions.