xref: /illumos-gate/usr/src/cmd/zpool/zpool_main.c (revision a4faba164aa153855d621c694fc5aa75dd183b81)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <libintl.h>
#include <libuutil.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <priv.h>
#include <pwd.h>
#include <zone.h>
#include <sys/fs/zfs.h>

#include <sys/stat.h>

#include <libzfs.h>

#include "zpool_util.h"
#include "zfs_comutil.h"

#include "statcommon.h"

static int zpool_do_create(int, char **);
static int zpool_do_destroy(int, char **);

static int zpool_do_add(int, char **);
static int zpool_do_remove(int, char **);

static int zpool_do_list(int, char **);
static int zpool_do_iostat(int, char **);
static int zpool_do_status(int, char **);

static int zpool_do_online(int, char **);
static int zpool_do_offline(int, char **);
static int zpool_do_clear(int, char **);

static int zpool_do_attach(int, char **);
static int zpool_do_detach(int, char **);
static int zpool_do_replace(int, char **);

static int zpool_do_scrub(int, char **);

static int zpool_do_import(int, char **);
static int zpool_do_export(int, char **);

static int zpool_do_upgrade(int, char **);

static int zpool_do_history(int, char **);

static int zpool_do_get(int, char **);
static int zpool_do_set(int, char **);

/*
 * These libumem hooks provide a reasonable set of defaults for the allocator's
 * debugging facilities.
 */

#ifdef DEBUG
const char *
_umem_debug_init(void)
{
	return ("default,verbose"); /* $UMEM_DEBUG setting */
}

const char *
_umem_logging_init(void)
{
	return ("fail,contents"); /* $UMEM_LOGGING setting */
}
#endif

typedef enum {
	HELP_ADD,
	HELP_ATTACH,
	HELP_CLEAR,
	HELP_CREATE,
	HELP_DESTROY,
	HELP_DETACH,
	HELP_EXPORT,
	HELP_HISTORY,
	HELP_IMPORT,
	HELP_IOSTAT,
	HELP_LIST,
	HELP_OFFLINE,
	HELP_ONLINE,
	HELP_REPLACE,
	HELP_REMOVE,
	HELP_SCRUB,
	HELP_STATUS,
	HELP_UPGRADE,
	HELP_GET,
	HELP_SET
} zpool_help_t;


typedef struct zpool_command {
	const char	*name;
	int		(*func)(int, char **);
	zpool_help_t	usage;
} zpool_command_t;

/*
 * Master command table.  Each ZFS command has a name, associated function, and
 * usage message.  The usage messages need to be internationalized, so we have
 * to have a function to return the usage message based on a command index.
 *
 * These commands are organized according to how they are displayed in the usage
 * message.  An empty command (one with a NULL name) indicates an empty line in
 * the generic usage message.
 */
static zpool_command_t command_table[] = {
	{ "create",	zpool_do_create,	HELP_CREATE		},
	{ "destroy",	zpool_do_destroy,	HELP_DESTROY		},
	{ NULL },
	{ "add",	zpool_do_add,		HELP_ADD		},
	{ "remove",	zpool_do_remove,	HELP_REMOVE		},
	{ NULL },
	{ "list",	zpool_do_list,		HELP_LIST		},
	{ "iostat",	zpool_do_iostat,	HELP_IOSTAT		},
	{ "status",	zpool_do_status,	HELP_STATUS		},
	{ NULL },
	{ "online",	zpool_do_online,	HELP_ONLINE		},
	{ "offline",	zpool_do_offline,	HELP_OFFLINE		},
	{ "clear",	zpool_do_clear,		HELP_CLEAR		},
	{ NULL },
	{ "attach",	zpool_do_attach,	HELP_ATTACH		},
	{ "detach",	zpool_do_detach,	HELP_DETACH		},
	{ "replace",	zpool_do_replace,	HELP_REPLACE		},
	{ NULL },
	{ "scrub",	zpool_do_scrub,		HELP_SCRUB		},
	{ NULL },
	{ "import",	zpool_do_import,	HELP_IMPORT		},
	{ "export",	zpool_do_export,	HELP_EXPORT		},
	{ "upgrade",	zpool_do_upgrade,	HELP_UPGRADE		},
	{ NULL },
	{ "history",	zpool_do_history,	HELP_HISTORY		},
	{ "get",	zpool_do_get,		HELP_GET		},
	{ "set",	zpool_do_set,		HELP_SET		},
};

#define	NCOMMAND	(sizeof (command_table) / sizeof (command_table[0]))

zpool_command_t *current_command;
static char history_str[HIS_MAX_RECORD_LEN];

static uint_t timestamp_fmt = NODATE;

static const char *
get_usage(zpool_help_t idx) {
	switch (idx) {
	case HELP_ADD:
		return (gettext("\tadd [-fn] <pool> <vdev> ...\n"));
	case HELP_ATTACH:
		return (gettext("\tattach [-f] <pool> <device> "
		    "<new-device>\n"));
	case HELP_CLEAR:
		return (gettext("\tclear <pool> [device]\n"));
	case HELP_CREATE:
		return (gettext("\tcreate [-fn] [-o property=value] ... \n"
		    "\t    [-O file-system-property=value] ... \n"
		    "\t    [-m mountpoint] [-R root] <pool> <vdev> ...\n"));
	case HELP_DESTROY:
		return (gettext("\tdestroy [-f] <pool>\n"));
	case HELP_DETACH:
		return (gettext("\tdetach <pool> <device>\n"));
	case HELP_EXPORT:
		return (gettext("\texport [-f] <pool> ...\n"));
	case HELP_HISTORY:
		return (gettext("\thistory [-il] [<pool>] ...\n"));
	case HELP_IMPORT:
		return (gettext("\timport [-d dir] [-D]\n"
		    "\timport [-o mntopts] [-o property=value] ... \n"
		    "\t    [-d dir | -c cachefile] [-D] [-f] [-R root] -a\n"
		    "\timport [-o mntopts] [-o property=value] ... \n"
		    "\t    [-d dir | -c cachefile] [-D] [-f] [-R root] "
		    "<pool | id> [newpool]\n"));
	case HELP_IOSTAT:
		return (gettext("\tiostat [-v] [-T d|u] [pool] ... [interval "
		    "[count]]\n"));
	case HELP_LIST:
		return (gettext("\tlist [-H] [-o property[,...]] "
		    "[pool] ...\n"));
	case HELP_OFFLINE:
		return (gettext("\toffline [-t] <pool> <device> ...\n"));
	case HELP_ONLINE:
		return (gettext("\tonline <pool> <device> ...\n"));
	case HELP_REPLACE:
		return (gettext("\treplace [-f] <pool> <device> "
		    "[new-device]\n"));
	case HELP_REMOVE:
		return (gettext("\tremove <pool> <device> ...\n"));
	case HELP_SCRUB:
		return (gettext("\tscrub [-s] <pool> ...\n"));
	case HELP_STATUS:
		return (gettext("\tstatus [-vx] [pool] ...\n"));
	case HELP_UPGRADE:
		return (gettext("\tupgrade\n"
		    "\tupgrade -v\n"
		    "\tupgrade [-V version] <-a | pool ...>\n"));
	case HELP_GET:
		return (gettext("\tget <\"all\" | property[,...]> "
		    "<pool> ...\n"));
	case HELP_SET:
		return (gettext("\tset <property=value> <pool> \n"));
	}

	abort();
	/* NOTREACHED */
}


/*
 * Callback routine that will print out a pool property value.
 */
static int
print_prop_cb(int prop, void *cb)
{
	FILE *fp = cb;

	(void) fprintf(fp, "\t%-13s  ", zpool_prop_to_name(prop));

	if (zpool_prop_readonly(prop))
		(void) fprintf(fp, "  NO   ");
	else
		(void) fprintf(fp, " YES    ");

	if (zpool_prop_values(prop) == NULL)
		(void) fprintf(fp, "-\n");
	else
		(void) fprintf(fp, "%s\n", zpool_prop_values(prop));

	return (ZPROP_CONT);
}

/*
 * Display usage message.  If we're inside a command, display only the usage for
 * that command.  Otherwise, iterate over the entire command table and display
 * a complete usage message.
 */
void
usage(boolean_t requested)
{
	FILE *fp = requested ? stdout : stderr;

	if (current_command == NULL) {
		int i;

		(void) fprintf(fp, gettext("usage: zpool command args ...\n"));
		(void) fprintf(fp,
		    gettext("where 'command' is one of the following:\n\n"));

		for (i = 0; i < NCOMMAND; i++) {
			if (command_table[i].name == NULL)
				(void) fprintf(fp, "\n");
			else
				(void) fprintf(fp, "%s",
				    get_usage(command_table[i].usage));
		}
	} else {
		(void) fprintf(fp, gettext("usage:\n"));
		(void) fprintf(fp, "%s", get_usage(current_command->usage));
	}

	if (current_command != NULL &&
	    ((strcmp(current_command->name, "set") == 0) ||
	    (strcmp(current_command->name, "get") == 0) ||
	    (strcmp(current_command->name, "list") == 0))) {

		(void) fprintf(fp,
		    gettext("\nthe following properties are supported:\n"));

		(void) fprintf(fp, "\n\t%-13s  %s  %s\n\n",
		    "PROPERTY", "EDIT", "VALUES");

		/* Iterate over all properties */
		(void) zprop_iter(print_prop_cb, fp, B_FALSE, B_TRUE,
		    ZFS_TYPE_POOL);
	}

	/*
	 * See comments at end of main().
	 */
	if (getenv("ZFS_ABORT") != NULL) {
		(void) printf("dumping core by request\n");
		abort();
	}

	exit(requested ? 0 : 2);
}

void
print_vdev_tree(zpool_handle_t *zhp, const char *name, nvlist_t *nv, int indent,
    boolean_t print_logs)
{
	nvlist_t **child;
	uint_t c, children;
	char *vname;

	if (name != NULL)
		(void) printf("\t%*s%s\n", indent, "", name);

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	    &child, &children) != 0)
		return;

	for (c = 0; c < children; c++) {
		uint64_t is_log = B_FALSE;

		(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
		    &is_log);
		if ((is_log && !print_logs) || (!is_log && print_logs))
			continue;

		vname = zpool_vdev_name(g_zfs, zhp, child[c]);
		print_vdev_tree(zhp, vname, child[c], indent + 2,
		    B_FALSE);
		free(vname);
	}
}

/*
 * Add a property pair (name, string-value) into a property nvlist.
 */
static int
add_prop_list(const char *propname, char *propval, nvlist_t **props,
    boolean_t poolprop)
{
	zpool_prop_t prop = ZPROP_INVAL;
	zfs_prop_t fprop;
	nvlist_t *proplist;
	const char *normnm;
	char *strval;

	if (*props == NULL &&
	    nvlist_alloc(props, NV_UNIQUE_NAME, 0) != 0) {
		(void) fprintf(stderr,
		    gettext("internal error: out of memory\n"));
		return (1);
	}

	proplist = *props;

	if (poolprop) {
		if ((prop = zpool_name_to_prop(propname)) == ZPROP_INVAL) {
			(void) fprintf(stderr, gettext("property '%s' is "
			    "not a valid pool property\n"), propname);
			return (2);
		}
		normnm = zpool_prop_to_name(prop);
	} else {
		if ((fprop = zfs_name_to_prop(propname)) != ZPROP_INVAL) {
			normnm = zfs_prop_to_name(fprop);
		} else {
			normnm = propname;
		}
	}

	if (nvlist_lookup_string(proplist, normnm, &strval) == 0 &&
	    prop != ZPOOL_PROP_CACHEFILE) {
		(void) fprintf(stderr, gettext("property '%s' "
		    "specified multiple times\n"), propname);
		return (2);
	}

	if (nvlist_add_string(proplist, normnm, propval) != 0) {
		(void) fprintf(stderr, gettext("internal "
		    "error: out of memory\n"));
		return (1);
	}

	return (0);
}

/*
 * zpool add [-fn] <pool> <vdev> ...
 *
 *	-f	Force addition of devices, even if they appear in use
 *	-n	Do not add the devices, but display the resulting layout if
 *		they were to be added.
 *
 * Adds the given vdevs to 'pool'.  As with create, the bulk of this work is
 * handled by get_vdev_spec(), which constructs the nvlist needed to pass to
 * libzfs.
 */
int
zpool_do_add(int argc, char **argv)
{
	boolean_t force = B_FALSE;
	boolean_t dryrun = B_FALSE;
	int c;
	nvlist_t *nvroot;
	char *poolname;
	int ret;
	zpool_handle_t *zhp;
	nvlist_t *config;

	/* check options */
	while ((c = getopt(argc, argv, "fn")) != -1) {
		switch (c) {
		case 'f':
			force = B_TRUE;
			break;
		case 'n':
			dryrun = B_TRUE;
			break;
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
		(void) fprintf(stderr, gettext("missing pool name argument\n"));
		usage(B_FALSE);
	}
	if (argc < 2) {
		(void) fprintf(stderr, gettext("missing vdev specification\n"));
		usage(B_FALSE);
	}

	poolname = argv[0];

	argc--;
	argv++;

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
		return (1);

	if ((config = zpool_get_config(zhp, NULL)) == NULL) {
		(void) fprintf(stderr, gettext("pool '%s' is unavailable\n"),
		    poolname);
		zpool_close(zhp);
		return (1);
	}

	/* pass off to get_vdev_spec for processing */
	nvroot = make_root_vdev(zhp, force, !force, B_FALSE, dryrun,
	    argc, argv);
	if (nvroot == NULL) {
		zpool_close(zhp);
		return (1);
	}

	if (dryrun) {
		nvlist_t *poolnvroot;

		verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
		    &poolnvroot) == 0);

		(void) printf(gettext("would update '%s' to the following "
		    "configuration:\n"), zpool_get_name(zhp));

		/* print original main pool and new tree */
		print_vdev_tree(zhp, poolname, poolnvroot, 0, B_FALSE);
		print_vdev_tree(zhp, NULL, nvroot, 0, B_FALSE);

		/* Do the same for the logs */
		if (num_logs(poolnvroot) > 0) {
			print_vdev_tree(zhp, "logs", poolnvroot, 0, B_TRUE);
			print_vdev_tree(zhp, NULL, nvroot, 0, B_TRUE);
		} else if (num_logs(nvroot) > 0) {
			print_vdev_tree(zhp, "logs", nvroot, 0, B_TRUE);
		}

		ret = 0;
	} else {
		ret = (zpool_add(zhp, nvroot) != 0);
	}

	nvlist_free(nvroot);
	zpool_close(zhp);

	return (ret);
}

/*
 * zpool remove <pool> <vdev> ...
 *
 * Removes the given vdev from the pool.  Currently, this only supports removing
 * spares and cache devices from the pool.  Eventually, we'll want to support
 * removing leaf vdevs (as an alias for 'detach') as well as toplevel vdevs.
 */
int
zpool_do_remove(int argc, char **argv)
{
	char *poolname;
	int i, ret = 0;
	zpool_handle_t *zhp;

	argc--;
	argv++;

	/* get pool name and check number of arguments */
	if (argc < 1) {
		(void) fprintf(stderr, gettext("missing pool name argument\n"));
		usage(B_FALSE);
	}
	if (argc < 2) {
		(void) fprintf(stderr, gettext("missing device\n"));
		usage(B_FALSE);
	}

	poolname = argv[0];

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
		return (1);

	for (i = 1; i < argc; i++) {
		if (zpool_vdev_remove(zhp, argv[i]) != 0)
			ret = 1;
	}

	return (ret);
}

/*
 * zpool create [-fn] [-o property=value] ...
 *		[-O file-system-property=value] ...
 *		[-R root] [-m mountpoint] <pool> <dev> ...
 *
 *	-f	Force creation, even if devices appear in use
 *	-n	Do not create the pool, but display the resulting layout if it
 *		were to be created.
 *      -R	Create a pool under an alternate root
 *      -m	Set default mountpoint for the root dataset.  By default it's
 *      	'/<pool>'
 *	-o	Set property=value.
 *	-O	Set fsproperty=value in the pool's root file system
 *
 * Creates the named pool according to the given vdev specification.  The
 * bulk of the vdev processing is done in get_vdev_spec() in zpool_vdev.c.  Once
 * we get the nvlist back from get_vdev_spec(), we either print out the contents
 * (if '-n' was specified), or pass it to libzfs to do the creation.
 */
int
zpool_do_create(int argc, char **argv)
{
	boolean_t force = B_FALSE;
	boolean_t dryrun = B_FALSE;
	int c;
	nvlist_t *nvroot = NULL;
	char *poolname;
	int ret = 1;
	char *altroot = NULL;
	char *mountpoint = NULL;
	nvlist_t *fsprops = NULL;
	nvlist_t *props = NULL;
	char *propval;

	/* check options */
	while ((c = getopt(argc, argv, ":fnR:m:o:O:")) != -1) {
		switch (c) {
		case 'f':
			force = B_TRUE;
			break;
		case 'n':
			dryrun = B_TRUE;
			break;
		case 'R':
			altroot = optarg;
			if (add_prop_list(zpool_prop_to_name(
			    ZPOOL_PROP_ALTROOT), optarg, &props, B_TRUE))
				goto errout;
			if (nvlist_lookup_string(props,
			    zpool_prop_to_name(ZPOOL_PROP_CACHEFILE),
			    &propval) == 0)
				break;
			if (add_prop_list(zpool_prop_to_name(
			    ZPOOL_PROP_CACHEFILE), "none", &props, B_TRUE))
				goto errout;
			break;
		case 'm':
			mountpoint = optarg;
			break;
		case 'o':
			if ((propval = strchr(optarg, '=')) == NULL) {
				(void) fprintf(stderr, gettext("missing "
				    "'=' for -o option\n"));
				goto errout;
			}
			*propval = '\0';
			propval++;

			if (add_prop_list(optarg, propval, &props, B_TRUE))
				goto errout;
			break;
		case 'O':
			if ((propval = strchr(optarg, '=')) == NULL) {
				(void) fprintf(stderr, gettext("missing "
				    "'=' for -O option\n"));
				goto errout;
			}
			*propval = '\0';
			propval++;

			if (add_prop_list(optarg, propval, &fsprops, B_FALSE))
				goto errout;
			break;
		case ':':
			(void) fprintf(stderr, gettext("missing argument for "
			    "'%c' option\n"), optopt);
			goto badusage;
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			goto badusage;
		}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
		(void) fprintf(stderr, gettext("missing pool name argument\n"));
		goto badusage;
	}
	if (argc < 2) {
		(void) fprintf(stderr, gettext("missing vdev specification\n"));
		goto badusage;
	}

	poolname = argv[0];

	/*
	 * As a special case, check for use of '/' in the name, and direct the
	 * user to use 'zfs create' instead.
	 */
	if (strchr(poolname, '/') != NULL) {
		(void) fprintf(stderr, gettext("cannot create '%s': invalid "
		    "character '/' in pool name\n"), poolname);
		(void) fprintf(stderr, gettext("use 'zfs create' to "
		    "create a dataset\n"));
		goto errout;
	}

	/* pass off to get_vdev_spec for bulk processing */
	nvroot = make_root_vdev(NULL, force, !force, B_FALSE, dryrun,
	    argc - 1, argv + 1);
	if (nvroot == NULL)
		goto errout;

	/* make_root_vdev() allows 0 toplevel children if there are spares */
	if (!zfs_allocatable_devs(nvroot)) {
		(void) fprintf(stderr, gettext("invalid vdev "
		    "specification: at least one toplevel vdev must be "
		    "specified\n"));
		goto errout;
	}


	if (altroot != NULL && altroot[0] != '/') {
		(void) fprintf(stderr, gettext("invalid alternate root '%s': "
		    "must be an absolute path\n"), altroot);
		goto errout;
	}

	/*
	 * Check the validity of the mountpoint and direct the user to use the
	 * '-m' mountpoint option if it looks like its in use.
	 */
	if (mountpoint == NULL ||
	    (strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) != 0 &&
	    strcmp(mountpoint, ZFS_MOUNTPOINT_NONE) != 0)) {
		char buf[MAXPATHLEN];
		DIR *dirp;

		if (mountpoint && mountpoint[0] != '/') {
			(void) fprintf(stderr, gettext("invalid mountpoint "
			    "'%s': must be an absolute path, 'legacy', or "
			    "'none'\n"), mountpoint);
			goto errout;
		}

		if (mountpoint == NULL) {
			if (altroot != NULL)
				(void) snprintf(buf, sizeof (buf), "%s/%s",
				    altroot, poolname);
			else
				(void) snprintf(buf, sizeof (buf), "/%s",
				    poolname);
		} else {
			if (altroot != NULL)
				(void) snprintf(buf, sizeof (buf), "%s%s",
				    altroot, mountpoint);
			else
				(void) snprintf(buf, sizeof (buf), "%s",
				    mountpoint);
		}

		if ((dirp = opendir(buf)) == NULL && errno != ENOENT) {
			(void) fprintf(stderr, gettext("mountpoint '%s' : "
			    "%s\n"), buf, strerror(errno));
			(void) fprintf(stderr, gettext("use '-m' "
			    "option to provide a different default\n"));
			goto errout;
		} else if (dirp) {
			int count = 0;

			while (count < 3 && readdir(dirp) != NULL)
				count++;
			(void) closedir(dirp);

			if (count > 2) {
				(void) fprintf(stderr, gettext("mountpoint "
				    "'%s' exists and is not empty\n"), buf);
				(void) fprintf(stderr, gettext("use '-m' "
				    "option to provide a "
				    "different default\n"));
				goto errout;
			}
		}
	}

	if (dryrun) {
		/*
		 * For a dry run invocation, print out a basic message and run
		 * through all the vdevs in the list and print out in an
		 * appropriate hierarchy.
		 */
		(void) printf(gettext("would create '%s' with the "
		    "following layout:\n\n"), poolname);

		print_vdev_tree(NULL, poolname, nvroot, 0, B_FALSE);
		if (num_logs(nvroot) > 0)
			print_vdev_tree(NULL, "logs", nvroot, 0, B_TRUE);

		ret = 0;
	} else {
		/*
		 * Hand off to libzfs.
		 */
		if (zpool_create(g_zfs, poolname,
		    nvroot, props, fsprops) == 0) {
			zfs_handle_t *pool = zfs_open(g_zfs, poolname,
			    ZFS_TYPE_FILESYSTEM);
			if (pool != NULL) {
				if (mountpoint != NULL)
					verify(zfs_prop_set(pool,
					    zfs_prop_to_name(
					    ZFS_PROP_MOUNTPOINT),
					    mountpoint) == 0);
				if (zfs_mount(pool, NULL, 0) == 0)
					ret = zfs_shareall(pool);
				zfs_close(pool);
			}
		} else if (libzfs_errno(g_zfs) == EZFS_INVALIDNAME) {
			(void) fprintf(stderr, gettext("pool name may have "
			    "been omitted\n"));
		}
	}

errout:
	nvlist_free(nvroot);
	nvlist_free(fsprops);
	nvlist_free(props);
	return (ret);
badusage:
	nvlist_free(fsprops);
	nvlist_free(props);
	usage(B_FALSE);
	return (2);
}

/*
 * zpool destroy <pool>
 *
 * 	-f	Forcefully unmount any datasets
 *
 * Destroy the given pool.  Automatically unmounts any datasets in the pool.
 */
int
zpool_do_destroy(int argc, char **argv)
{
	boolean_t force = B_FALSE;
	int c;
	char *pool;
	zpool_handle_t *zhp;
	int ret;

	/* check options */
	while ((c = getopt(argc, argv, "f")) != -1) {
		switch (c) {
		case 'f':
			force = B_TRUE;
			break;
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	argc -= optind;
	argv += optind;

	/* check arguments */
	if (argc < 1) {
		(void) fprintf(stderr, gettext("missing pool argument\n"));
		usage(B_FALSE);
	}
	if (argc > 1) {
		(void) fprintf(stderr, gettext("too many arguments\n"));
		usage(B_FALSE);
	}

	pool = argv[0];

	if ((zhp = zpool_open_canfail(g_zfs, pool)) == NULL) {
		/*
		 * As a special case, check for use of '/' in the name, and
		 * direct the user to use 'zfs destroy' instead.
		 */
		if (strchr(pool, '/') != NULL)
			(void) fprintf(stderr, gettext("use 'zfs destroy' to "
			    "destroy a dataset\n"));
		return (1);
	}

	if (zpool_disable_datasets(zhp, force) != 0) {
		(void) fprintf(stderr, gettext("could not destroy '%s': "
		    "could not unmount datasets\n"), zpool_get_name(zhp));
		return (1);
	}

	ret = (zpool_destroy(zhp) != 0);

	zpool_close(zhp);

	return (ret);
}

/*
 * zpool export [-f] <pool> ...
 *
 *	-f	Forcefully unmount datasets
 *
 * Export the given pools.  By default, the command will attempt to cleanly
 * unmount any active datasets within the pool.  If the '-f' flag is specified,
 * then the datasets will be forcefully unmounted.
 */
int
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, "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);
			usage(B_FALSE);
		}
	}

	argc -= optind;
	argv += optind;

	/* check arguments */
	if (argc < 1) {
		(void) fprintf(stderr, gettext("missing pool argument\n"));
		usage(B_FALSE);
	}

	ret = 0;
	for (i = 0; i < argc; i++) {
		if ((zhp = zpool_open_canfail(g_zfs, argv[i])) == NULL) {
			ret = 1;
			continue;
		}

		if (zpool_disable_datasets(zhp, force) != 0) {
			ret = 1;
			zpool_close(zhp);
			continue;
		}

		if (hardforce) {
			if (zpool_export_force(zhp) != 0)
				ret = 1;
		} else if (zpool_export(zhp, force) != 0) {
			ret = 1;
		}

		zpool_close(zhp);
	}

	return (ret);
}

/*
 * Given a vdev configuration, determine the maximum width needed for the device
 * name column.
 */
static int
max_width(zpool_handle_t *zhp, nvlist_t *nv, int depth, int max)
{
	char *name = zpool_vdev_name(g_zfs, zhp, nv);
	nvlist_t **child;
	uint_t c, children;
	int ret;

	if (strlen(name) + depth > max)
		max = strlen(name) + depth;

	free(name);

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
	    &child, &children) == 0) {
		for (c = 0; c < children; c++)
			if ((ret = max_width(zhp, child[c], depth + 2,
			    max)) > max)
				max = ret;
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
	    &child, &children) == 0) {
		for (c = 0; c < children; c++)
			if ((ret = max_width(zhp, child[c], depth + 2,
			    max)) > max)
				max = ret;
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	    &child, &children) == 0) {
		for (c = 0; c < children; c++)
			if ((ret = max_width(zhp, child[c], depth + 2,
			    max)) > max)
				max = ret;
	}


	return (max);
}

typedef struct spare_cbdata {
	uint64_t	cb_guid;
	zpool_handle_t	*cb_zhp;
} spare_cbdata_t;

static boolean_t
find_vdev(nvlist_t *nv, uint64_t search)
{
	uint64_t guid;
	nvlist_t **child;
	uint_t c, children;

	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) == 0 &&
	    search == guid)
		return (B_TRUE);

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	    &child, &children) == 0) {
		for (c = 0; c < children; c++)
			if (find_vdev(child[c], search))
				return (B_TRUE);
	}

	return (B_FALSE);
}

static int
find_spare(zpool_handle_t *zhp, void *data)
{
	spare_cbdata_t *cbp = data;
	nvlist_t *config, *nvroot;

	config = zpool_get_config(zhp, NULL);
	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	    &nvroot) == 0);

	if (find_vdev(nvroot, cbp->cb_guid)) {
		cbp->cb_zhp = zhp;
		return (1);
	}

	zpool_close(zhp);
	return (0);
}

/*
 * Print out configuration state as requested by status_callback.
 */
void
print_status_config(zpool_handle_t *zhp, const char *name, nvlist_t *nv,
    int namewidth, int depth, boolean_t isspare)
{
	nvlist_t **child;
	uint_t c, children;
	vdev_stat_t *vs;
	char rbuf[6], wbuf[6], cbuf[6], repaired[7];
	char *vname;
	uint64_t notpresent;
	spare_cbdata_t cb;
	char *state;

	verify(nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_STATS,
	    (uint64_t **)&vs, &c) == 0);

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	    &child, &children) != 0)
		children = 0;

	state = zpool_state_to_name(vs->vs_state, vs->vs_aux);
	if (isspare) {
		/*
		 * For hot spares, we use the terms 'INUSE' and 'AVAILABLE' for
		 * online drives.
		 */
		if (vs->vs_aux == VDEV_AUX_SPARED)
			state = "INUSE";
		else if (vs->vs_state == VDEV_STATE_HEALTHY)
			state = "AVAIL";
	}

	(void) printf("\t%*s%-*s  %-8s", depth, "", namewidth - depth,
	    name, state);

	if (!isspare) {
		zfs_nicenum(vs->vs_read_errors, rbuf, sizeof (rbuf));
		zfs_nicenum(vs->vs_write_errors, wbuf, sizeof (wbuf));
		zfs_nicenum(vs->vs_checksum_errors, cbuf, sizeof (cbuf));
		(void) printf(" %5s %5s %5s", rbuf, wbuf, cbuf);
	}

	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT,
	    &notpresent) == 0) {
		char *path;
		verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0);
		(void) printf("  was %s", path);
	} else if (vs->vs_aux != 0) {
		(void) printf("  ");

		switch (vs->vs_aux) {
		case VDEV_AUX_OPEN_FAILED:
			(void) printf(gettext("cannot open"));
			break;

		case VDEV_AUX_BAD_GUID_SUM:
			(void) printf(gettext("missing device"));
			break;

		case VDEV_AUX_NO_REPLICAS:
			(void) printf(gettext("insufficient replicas"));
			break;

		case VDEV_AUX_VERSION_NEWER:
			(void) printf(gettext("newer version"));
			break;

		case VDEV_AUX_SPARED:
			verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID,
			    &cb.cb_guid) == 0);
			if (zpool_iter(g_zfs, find_spare, &cb) == 1) {
				if (strcmp(zpool_get_name(cb.cb_zhp),
				    zpool_get_name(zhp)) == 0)
					(void) printf(gettext("currently in "
					    "use"));
				else
					(void) printf(gettext("in use by "
					    "pool '%s'"),
					    zpool_get_name(cb.cb_zhp));
				zpool_close(cb.cb_zhp);
			} else {
				(void) printf(gettext("currently in use"));
			}
			break;

		case VDEV_AUX_ERR_EXCEEDED:
			(void) printf(gettext("too many errors"));
			break;

		case VDEV_AUX_IO_FAILURE:
			(void) printf(gettext("experienced I/O failures"));
			break;

		case VDEV_AUX_BAD_LOG:
			(void) printf(gettext("bad intent log"));
			break;

		default:
			(void) printf(gettext("corrupted data"));
			break;
		}
	} else if (vs->vs_scrub_repaired != 0 && children == 0) {
		/*
		 * Report bytes resilvered/repaired on leaf devices.
		 */
		zfs_nicenum(vs->vs_scrub_repaired, repaired, sizeof (repaired));
		(void) printf(gettext("  %s %s"), repaired,
		    (vs->vs_scrub_type == POOL_SCRUB_RESILVER) ?
		    "resilvered" : "repaired");
	}

	(void) printf("\n");

	for (c = 0; c < children; c++) {
		uint64_t is_log = B_FALSE;

		/* Don't print logs here */
		(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
		    &is_log);
		if (is_log)
			continue;
		vname = zpool_vdev_name(g_zfs, zhp, child[c]);
		print_status_config(zhp, vname, child[c],
		    namewidth, depth + 2, isspare);
		free(vname);
	}
}


/*
 * Print the configuration of an exported pool.  Iterate over all vdevs in the
 * pool, printing out the name and status for each one.
 */
void
print_import_config(const char *name, nvlist_t *nv, int namewidth, int depth)
{
	nvlist_t **child;
	uint_t c, children;
	vdev_stat_t *vs;
	char *type, *vname;

	verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) == 0);
	if (strcmp(type, VDEV_TYPE_MISSING) == 0)
		return;

	verify(nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_STATS,
	    (uint64_t **)&vs, &c) == 0);

	(void) printf("\t%*s%-*s", depth, "", namewidth - depth, name);
	(void) printf("  %s", zpool_state_to_name(vs->vs_state, vs->vs_aux));

	if (vs->vs_aux != 0) {
		(void) printf("  ");

		switch (vs->vs_aux) {
		case VDEV_AUX_OPEN_FAILED:
			(void) printf(gettext("cannot open"));
			break;

		case VDEV_AUX_BAD_GUID_SUM:
			(void) printf(gettext("missing device"));
			break;

		case VDEV_AUX_NO_REPLICAS:
			(void) printf(gettext("insufficient replicas"));
			break;

		case VDEV_AUX_VERSION_NEWER:
			(void) printf(gettext("newer version"));
			break;

		case VDEV_AUX_ERR_EXCEEDED:
			(void) printf(gettext("too many errors"));
			break;

		default:
			(void) printf(gettext("corrupted data"));
			break;
		}
	}
	(void) printf("\n");

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	    &child, &children) != 0)
		return;

	for (c = 0; c < children; c++) {
		uint64_t is_log = B_FALSE;

		(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
		    &is_log);
		if (is_log)
			continue;

		vname = zpool_vdev_name(g_zfs, NULL, child[c]);
		print_import_config(vname, child[c], namewidth, depth + 2);
		free(vname);
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
	    &child, &children) == 0) {
		(void) printf(gettext("\tcache\n"));
		for (c = 0; c < children; c++) {
			vname = zpool_vdev_name(g_zfs, NULL, child[c]);
			(void) printf("\t  %s\n", vname);
			free(vname);
		}
	}

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES,
	    &child, &children) == 0) {
		(void) printf(gettext("\tspares\n"));
		for (c = 0; c < children; c++) {
			vname = zpool_vdev_name(g_zfs, NULL, child[c]);
			(void) printf("\t  %s\n", vname);
			free(vname);
		}
	}
}

/*
 * Print log vdevs.
 * Logs are recorded as top level vdevs in the main pool child array
 * but with "is_log" set to 1. We use either print_status_config() or
 * print_import_config() to print the top level logs then any log
 * children (eg mirrored slogs) are printed recursively - which
 * works because only the top level vdev is marked "is_log"
 */
static void
print_logs(zpool_handle_t *zhp, nvlist_t *nv, int namewidth, boolean_t verbose)
{
	uint_t c, children;
	nvlist_t **child;

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, &child,
	    &children) != 0)
		return;

	(void) printf(gettext("\tlogs\n"));

	for (c = 0; c < children; c++) {
		uint64_t is_log = B_FALSE;
		char *name;

		(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
		    &is_log);
		if (!is_log)
			continue;
		name = zpool_vdev_name(g_zfs, zhp, child[c]);
		if (verbose)
			print_status_config(zhp, name, child[c], namewidth,
			    2, B_FALSE);
		else
			print_import_config(name, child[c], namewidth, 2);
		free(name);
	}
}
/*
 * Display the status for the given pool.
 */
static void
show_import(nvlist_t *config)
{
	uint64_t pool_state;
	vdev_stat_t *vs;
	char *name;
	uint64_t guid;
	char *msgid;
	nvlist_t *nvroot;
	int reason;
	const char *health;
	uint_t vsc;
	int namewidth;

	verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
	    &name) == 0);
	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
	    &guid) == 0);
	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
	    &pool_state) == 0);
	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	    &nvroot) == 0);

	verify(nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_STATS,
	    (uint64_t **)&vs, &vsc) == 0);
	health = zpool_state_to_name(vs->vs_state, vs->vs_aux);

	reason = zpool_import_status(config, &msgid);

	(void) printf(gettext("  pool: %s\n"), name);
	(void) printf(gettext("    id: %llu\n"), (u_longlong_t)guid);
	(void) printf(gettext(" state: %s"), health);
	if (pool_state == POOL_STATE_DESTROYED)
		(void) printf(gettext(" (DESTROYED)"));
	(void) printf("\n");

	switch (reason) {
	case ZPOOL_STATUS_MISSING_DEV_R:
	case ZPOOL_STATUS_MISSING_DEV_NR:
	case ZPOOL_STATUS_BAD_GUID_SUM:
		(void) printf(gettext("status: One or more devices are missing "
		    "from the system.\n"));
		break;

	case ZPOOL_STATUS_CORRUPT_LABEL_R:
	case ZPOOL_STATUS_CORRUPT_LABEL_NR:
		(void) printf(gettext("status: One or more devices contains "
		    "corrupted data.\n"));
		break;

	case ZPOOL_STATUS_CORRUPT_DATA:
		(void) printf(gettext("status: The pool data is corrupted.\n"));
		break;

	case ZPOOL_STATUS_OFFLINE_DEV:
		(void) printf(gettext("status: One or more devices "
		    "are offlined.\n"));
		break;

	case ZPOOL_STATUS_CORRUPT_POOL:
		(void) printf(gettext("status: The pool metadata is "
		    "corrupted.\n"));
		break;

	case ZPOOL_STATUS_VERSION_OLDER:
		(void) printf(gettext("status: The pool is formatted using an "
		    "older on-disk version.\n"));
		break;

	case ZPOOL_STATUS_VERSION_NEWER:
		(void) printf(gettext("status: The pool is formatted using an "
		    "incompatible version.\n"));
		break;

	case ZPOOL_STATUS_HOSTID_MISMATCH:
		(void) printf(gettext("status: The pool was last accessed by "
		    "another system.\n"));
		break;

	case ZPOOL_STATUS_FAULTED_DEV_R:
	case ZPOOL_STATUS_FAULTED_DEV_NR:
		(void) printf(gettext("status: One or more devices are "
		    "faulted.\n"));
		break;

	case ZPOOL_STATUS_BAD_LOG:
		(void) printf(gettext("status: An intent log record cannot be "
		    "read.\n"));
		break;

	default:
		/*
		 * No other status can be seen when importing pools.
		 */
		assert(reason == ZPOOL_STATUS_OK);
	}

	/*
	 * Print out an action according to the overall state of the pool.
	 */
	if (vs->vs_state == VDEV_STATE_HEALTHY) {
		if (reason == ZPOOL_STATUS_VERSION_OLDER)
			(void) printf(gettext("action: The pool can be "
			    "imported using its name or numeric identifier, "
			    "though\n\tsome features will not be available "
			    "without an explicit 'zpool upgrade'.\n"));
		else if (reason == ZPOOL_STATUS_HOSTID_MISMATCH)
			(void) printf(gettext("action: The pool can be "
			    "imported using its name or numeric "
			    "identifier and\n\tthe '-f' flag.\n"));
		else
			(void) printf(gettext("action: The pool can be "
			    "imported using its name or numeric "
			    "identifier.\n"));
	} else if (vs->vs_state == VDEV_STATE_DEGRADED) {
		(void) printf(gettext("action: The pool can be imported "
		    "despite missing or damaged devices.  The\n\tfault "
		    "tolerance of the pool may be compromised if imported.\n"));
	} else {
		switch (reason) {
		case ZPOOL_STATUS_VERSION_NEWER:
			(void) printf(gettext("action: The pool cannot be "
			    "imported.  Access the pool on a system running "
			    "newer\n\tsoftware, or recreate the pool from "
			    "backup.\n"));
			break;
		case ZPOOL_STATUS_MISSING_DEV_R:
		case ZPOOL_STATUS_MISSING_DEV_NR:
		case ZPOOL_STATUS_BAD_GUID_SUM:
			(void) printf(gettext("action: The pool cannot be "
			    "imported. Attach the missing\n\tdevices and try "
			    "again.\n"));
			break;
		default:
			(void) printf(gettext("action: The pool cannot be "
			    "imported due to damaged devices or data.\n"));
		}
	}

	/*
	 * If the state is "closed" or "can't open", and the aux state
	 * is "corrupt data":
	 */
	if (((vs->vs_state == VDEV_STATE_CLOSED) ||
	    (vs->vs_state == VDEV_STATE_CANT_OPEN)) &&
	    (vs->vs_aux == VDEV_AUX_CORRUPT_DATA)) {
		if (pool_state == POOL_STATE_DESTROYED)
			(void) printf(gettext("\tThe pool was destroyed, "
			    "but can be imported using the '-Df' flags.\n"));
		else if (pool_state != POOL_STATE_EXPORTED)
			(void) printf(gettext("\tThe pool may be active on "
			    "another system, but can be imported using\n\t"
			    "the '-f' flag.\n"));
	}

	if (msgid != NULL)
		(void) printf(gettext("   see: http://www.sun.com/msg/%s\n"),
		    msgid);

	(void) printf(gettext("config:\n\n"));

	namewidth = max_width(NULL, nvroot, 0, 0);
	if (namewidth < 10)
		namewidth = 10;

	print_import_config(name, nvroot, namewidth, 0);
	if (num_logs(nvroot) > 0)
		print_logs(NULL, nvroot, namewidth, B_FALSE);

	if (reason == ZPOOL_STATUS_BAD_GUID_SUM) {
		(void) printf(gettext("\n\tAdditional devices are known to "
		    "be part of this pool, though their\n\texact "
		    "configuration cannot be determined.\n"));
	}
}

/*
 * Perform the import for the given configuration.  This passes the heavy
 * lifting off to zpool_import_props(), and then mounts the datasets contained
 * within the pool.
 */
static int
do_import(nvlist_t *config, const char *newname, const char *mntopts,
    int force, nvlist_t *props, boolean_t do_verbatim)
{
	zpool_handle_t *zhp;
	char *name;
	uint64_t state;
	uint64_t version;
	int error = 0;

	verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
	    &name) == 0);

	verify(nvlist_lookup_uint64(config,
	    ZPOOL_CONFIG_POOL_STATE, &state) == 0);
	verify(nvlist_lookup_uint64(config,
	    ZPOOL_CONFIG_VERSION, &version) == 0);
	if (version > SPA_VERSION) {
		(void) fprintf(stderr, gettext("cannot import '%s': pool "
		    "is formatted using a newer ZFS version\n"), name);
		return (1);
	} else if (state != POOL_STATE_EXPORTED && !force) {
		uint64_t hostid;

		if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_HOSTID,
		    &hostid) == 0) {
			if ((unsigned long)hostid != gethostid()) {
				char *hostname;
				uint64_t timestamp;
				time_t t;

				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);
			}
		} else {
			(void) fprintf(stderr, gettext("cannot import '%s': "
			    "pool may be in use from other system\n"), name);
			(void) fprintf(stderr, gettext("use '-f' to import "
			    "anyway\n"));
			return (1);
		}
	}

	if (zpool_import_props(g_zfs, config, newname, props, do_verbatim) != 0)
		return (1);

	if (newname != NULL)
		name = (char *)newname;

	if ((zhp = zpool_open_canfail(g_zfs, name)) == NULL)
		return (1);

	if (zpool_get_state(zhp) != POOL_STATE_UNAVAIL &&
	    zpool_enable_datasets(zhp, mntopts, 0) != 0) {
		zpool_close(zhp);
		return (1);
	}

	zpool_close(zhp);
	return (error);
}

/*
 * zpool import [-d dir] [-D]
 *       import [-o mntopts] [-o prop=value] ... [-R root] [-D]
 *              [-d dir | -c cachefile] [-f] -a
 *       import [-o mntopts] [-o prop=value] ... [-R root] [-D]
 *              [-d dir | -c cachefile] [-f] <pool | id> [newpool]
 *
 *	 -c	Read pool information from a cachefile instead of searching
 *		devices.
 *
 *       -d	Scan in a specific directory, other than /dev/dsk.  More than
 *		one directory can be specified using multiple '-d' options.
 *
 *       -D     Scan for previously destroyed pools or import all or only
 *              specified destroyed pools.
 *
 *       -R	Temporarily import the pool, with all mountpoints relative to
 *		the given root.  The pool will remain exported when the machine
 *		is rebooted.
 *
 *       -f	Force import, even if it appears that the pool is active.
 *
 *       -F	Import even in the presence of faulted vdevs.  This is an
 *       	intentionally undocumented option for testing purposes, and
 *       	treats the pool configuration as complete, leaving any bad
 *		vdevs in the FAULTED state. In other words, it does verbatim
 *		import.
 *
 *       -a	Import all pools found.
 *
 *       -o	Set property=value and/or temporary mount options (without '=').
 *
 * The import command scans for pools to import, and import pools based on pool
 * name and GUID.  The pool can also be renamed as part of the import process.
 */
int
zpool_do_import(int argc, char **argv)
{
	char **searchdirs = NULL;
	int nsearch = 0;
	int c;
	int err;
	nvlist_t *pools = NULL;
	boolean_t do_all = B_FALSE;
	boolean_t do_destroyed = B_FALSE;
	char *mntopts = NULL;
	boolean_t do_force = B_FALSE;
	nvpair_t *elem;
	nvlist_t *config;
	uint64_t searchguid = 0;
	char *searchname = NULL;
	char *propval;
	nvlist_t *found_config;
	nvlist_t *props = NULL;
	boolean_t first;
	boolean_t do_verbatim = B_FALSE;
	uint64_t pool_state;
	char *cachefile = NULL;

	/* check options */
	while ((c = getopt(argc, argv, ":ac:d:DfFo:p:R:")) != -1) {
		switch (c) {
		case 'a':
			do_all = B_TRUE;
			break;
		case 'c':
			cachefile = optarg;
			break;
		case 'd':
			if (searchdirs == NULL) {
				searchdirs = safe_malloc(sizeof (char *));
			} else {
				char **tmp = safe_malloc((nsearch + 1) *
				    sizeof (char *));
				bcopy(searchdirs, tmp, nsearch *
				    sizeof (char *));
				free(searchdirs);
				searchdirs = tmp;
			}
			searchdirs[nsearch++] = optarg;
			break;
		case 'D':
			do_destroyed = B_TRUE;
			break;
		case 'f':
			do_force = B_TRUE;
			break;
		case 'F':
			do_verbatim = B_TRUE;
			break;
		case 'o':
			if ((propval = strchr(optarg, '=')) != NULL) {
				*propval = '\0';
				propval++;
				if (add_prop_list(optarg, propval,
				    &props, B_TRUE))
					goto error;
			} else {
				mntopts = optarg;
			}
			break;
		case 'R':
			if (add_prop_list(zpool_prop_to_name(
			    ZPOOL_PROP_ALTROOT), optarg, &props, B_TRUE))
				goto error;
			if (nvlist_lookup_string(props,
			    zpool_prop_to_name(ZPOOL_PROP_CACHEFILE),
			    &propval) == 0)
				break;
			if (add_prop_list(zpool_prop_to_name(
			    ZPOOL_PROP_CACHEFILE), "none", &props, B_TRUE))
				goto error;
			break;
		case ':':
			(void) fprintf(stderr, gettext("missing argument for "
			    "'%c' option\n"), optopt);
			usage(B_FALSE);
			break;
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	argc -= optind;
	argv += optind;

	if (cachefile && nsearch != 0) {
		(void) fprintf(stderr, gettext("-c is incompatible with -d\n"));
		usage(B_FALSE);
	}

	if (searchdirs == NULL) {
		searchdirs = safe_malloc(sizeof (char *));
		searchdirs[0] = "/dev/dsk";
		nsearch = 1;
	}

	/* check argument count */
	if (do_all) {
		if (argc != 0) {
			(void) fprintf(stderr, gettext("too many arguments\n"));
			usage(B_FALSE);
		}
	} else {
		if (argc > 2) {
			(void) fprintf(stderr, gettext("too many arguments\n"));
			usage(B_FALSE);
		}

		/*
		 * Check for the SYS_CONFIG privilege.  We do this explicitly
		 * here because otherwise any attempt to discover pools will
		 * silently fail.
		 */
		if (argc == 0 && !priv_ineffect(PRIV_SYS_CONFIG)) {
			(void) fprintf(stderr, gettext("cannot "
			    "discover pools: permission denied\n"));
			free(searchdirs);
			return (1);
		}
	}

	/*
	 * Depending on the arguments given, we do one of the following:
	 *
	 *	<none>	Iterate through all pools and display information about
	 *		each one.
	 *
	 *	-a	Iterate through all pools and try to import each one.
	 *
	 *	<id>	Find the pool that corresponds to the given GUID/pool
	 *		name and import that one.
	 *
	 *	-D	Above options applies only to destroyed pools.
	 */
	if (argc != 0) {
		char *endptr;

		errno = 0;
		searchguid = strtoull(argv[0], &endptr, 10);
		if (errno != 0 || *endptr != '\0')
			searchname = argv[0];
		found_config = NULL;
	}

	if (cachefile) {
		pools = zpool_find_import_cached(g_zfs, cachefile, searchname,
		    searchguid);
	} else if (searchname != NULL) {
		pools = zpool_find_import_byname(g_zfs, nsearch, searchdirs,
		    searchname);
	} else {
		/*
		 * It's OK to search by guid even if searchguid is 0.
		 */
		pools = zpool_find_import_byguid(g_zfs, nsearch, searchdirs,
		    searchguid);
	}

	if (pools == NULL) {
		if (argc != 0) {
			(void) fprintf(stderr, gettext("cannot import '%s': "
			    "no such pool available\n"), argv[0]);
		}
		free(searchdirs);
		return (1);
	}

	/*
	 * At this point we have a list of import candidate configs. Even if
	 * we were searching by pool name or guid, we still need to
	 * post-process the list to deal with pool state and possible
	 * duplicate names.
	 */
	err = 0;
	elem = NULL;
	first = B_TRUE;
	while ((elem = nvlist_next_nvpair(pools, elem)) != NULL) {

		verify(nvpair_value_nvlist(elem, &config) == 0);

		verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
		    &pool_state) == 0);
		if (!do_destroyed && pool_state == POOL_STATE_DESTROYED)
			continue;
		if (do_destroyed && pool_state != POOL_STATE_DESTROYED)
			continue;

		if (argc == 0) {
			if (first)
				first = B_FALSE;
			else if (!do_all)
				(void) printf("\n");

			if (do_all)
				err |= do_import(config, NULL, mntopts,
				    do_force, props, do_verbatim);
			else
				show_import(config);
		} else if (searchname != NULL) {
			char *name;

			/*
			 * We are searching for a pool based on name.
			 */
			verify(nvlist_lookup_string(config,
			    ZPOOL_CONFIG_POOL_NAME, &name) == 0);

			if (strcmp(name, searchname) == 0) {
				if (found_config != NULL) {
					(void) fprintf(stderr, gettext(
					    "cannot import '%s': more than "
					    "one matching pool\n"), searchname);
					(void) fprintf(stderr, gettext(
					    "import by numeric ID instead\n"));
					err = B_TRUE;
				}
				found_config = config;
			}
		} else {
			uint64_t guid;

			/*
			 * Search for a pool by guid.
			 */
			verify(nvlist_lookup_uint64(config,
			    ZPOOL_CONFIG_POOL_GUID, &guid) == 0);

			if (guid == searchguid)
				found_config = config;
		}
	}

	/*
	 * If we were searching for a specific pool, verify that we found a
	 * pool, and then do the import.
	 */
	if (argc != 0 && err == 0) {
		if (found_config == NULL) {
			(void) fprintf(stderr, gettext("cannot import '%s': "
			    "no such pool available\n"), argv[0]);
			err = B_TRUE;
		} else {
			err |= do_import(found_config, argc == 1 ? NULL :
			    argv[1], mntopts, do_force, props, do_verbatim);
		}
	}

	/*
	 * If we were just looking for pools, report an error if none were
	 * found.
	 */
	if (argc == 0 && first)
		(void) fprintf(stderr,
		    gettext("no pools available to import\n"));

error:
	nvlist_free(props);
	nvlist_free(pools);
	free(searchdirs);

	return (err ? 1 : 0);
}

typedef struct iostat_cbdata {
	zpool_list_t *cb_list;
	int cb_verbose;
	int cb_iteration;
	int cb_namewidth;
} iostat_cbdata_t;

static void
print_iostat_separator(iostat_cbdata_t *cb)
{
	int i = 0;

	for (i = 0; i < cb->cb_namewidth; i++)
		(void) printf("-");
	(void) printf("  -----  -----  -----  -----  -----  -----\n");
}

static void
print_iostat_header(iostat_cbdata_t *cb)
{
	(void) printf("%*s     capacity     operations    bandwidth\n",
	    cb->cb_namewidth, "");
	(void) printf("%-*s   used  avail   read  write   read  write\n",
	    cb->cb_namewidth, "pool");
	print_iostat_separator(cb);
}

/*
 * Display a single statistic.
 */
static void
print_one_stat(uint64_t value)
{
	char buf[64];

	zfs_nicenum(value, buf, sizeof (buf));
	(void) printf("  %5s", buf);
}

/*
 * Print out all the statistics for the given vdev.  This can either be the
 * toplevel configuration, or called recursively.  If 'name' is NULL, then this
 * is a verbose output, and we don't want to display the toplevel pool stats.
 */
void
print_vdev_stats(zpool_handle_t *zhp, const char *name, nvlist_t *oldnv,
    nvlist_t *newnv, iostat_cbdata_t *cb, int depth)
{
	nvlist_t **oldchild, **newchild;
	uint_t c, children;
	vdev_stat_t *oldvs, *newvs;
	vdev_stat_t zerovs = { 0 };
	uint64_t tdelta;
	double scale;
	char *vname;

	if (oldnv != NULL) {
		verify(nvlist_lookup_uint64_array(oldnv, ZPOOL_CONFIG_STATS,
		    (uint64_t **)&oldvs, &c) == 0);
	} else {
		oldvs = &zerovs;
	}

	verify(nvlist_lookup_uint64_array(newnv, ZPOOL_CONFIG_STATS,
	    (uint64_t **)&newvs, &c) == 0);

	if (strlen(name) + depth > cb->cb_namewidth)
		(void) printf("%*s%s", depth, "", name);
	else
		(void) printf("%*s%s%*s", depth, "", name,
		    (int)(cb->cb_namewidth - strlen(name) - depth), "");

	tdelta = newvs->vs_timestamp - oldvs->vs_timestamp;

	if (tdelta == 0)
		scale = 1.0;
	else
		scale = (double)NANOSEC / tdelta;

	/* only toplevel vdevs have capacity stats */
	if (newvs->vs_space == 0) {
		(void) printf("      -      -");
	} else {
		print_one_stat(newvs->vs_alloc);
		print_one_stat(newvs->vs_space - newvs->vs_alloc);
	}

	print_one_stat((uint64_t)(scale * (newvs->vs_ops[ZIO_TYPE_READ] -
	    oldvs->vs_ops[ZIO_TYPE_READ])));

	print_one_stat((uint64_t)(scale * (newvs->vs_ops[ZIO_TYPE_WRITE] -
	    oldvs->vs_ops[ZIO_TYPE_WRITE])));

	print_one_stat((uint64_t)(scale * (newvs->vs_bytes[ZIO_TYPE_READ] -
	    oldvs->vs_bytes[ZIO_TYPE_READ])));

	print_one_stat((uint64_t)(scale * (newvs->vs_bytes[ZIO_TYPE_WRITE] -
	    oldvs->vs_bytes[ZIO_TYPE_WRITE])));

	(void) printf("\n");

	if (!cb->cb_verbose)
		return;

	if (nvlist_lookup_nvlist_array(newnv, ZPOOL_CONFIG_CHILDREN,
	    &newchild, &children) != 0)
		return;

	if (oldnv && nvlist_lookup_nvlist_array(oldnv, ZPOOL_CONFIG_CHILDREN,
	    &oldchild, &c) != 0)
		return;

	for (c = 0; c < children; c++) {
		vname = zpool_vdev_name(g_zfs, zhp, newchild[c]);
		print_vdev_stats(zhp, vname, oldnv ? oldchild[c] : NULL,
		    newchild[c], cb, depth + 2);
		free(vname);
	}

	/*
	 * Include level 2 ARC devices in iostat output
	 */
	if (nvlist_lookup_nvlist_array(newnv, ZPOOL_CONFIG_L2CACHE,
	    &newchild, &children) != 0)
		return;

	if (oldnv && nvlist_lookup_nvlist_array(oldnv, ZPOOL_CONFIG_L2CACHE,
	    &oldchild, &c) != 0)
		return;

	if (children > 0) {
		(void) printf("%-*s      -      -      -      -      -      "
		    "-\n", cb->cb_namewidth, "cache");
		for (c = 0; c < children; c++) {
			vname = zpool_vdev_name(g_zfs, zhp, newchild[c]);
			print_vdev_stats(zhp, vname, oldnv ? oldchild[c] : NULL,
			    newchild[c], cb, depth + 2);
			free(vname);
		}
	}
}

static int
refresh_iostat(zpool_handle_t *zhp, void *data)
{
	iostat_cbdata_t *cb = data;
	boolean_t missing;

	/*
	 * If the pool has disappeared, remove it from the list and continue.
	 */
	if (zpool_refresh_stats(zhp, &missing) != 0)
		return (-1);

	if (missing)
		pool_list_remove(cb->cb_list, zhp);

	return (0);
}

/*
 * Callback to print out the iostats for the given pool.
 */
int
print_iostat(zpool_handle_t *zhp, void *data)
{
	iostat_cbdata_t *cb = data;
	nvlist_t *oldconfig, *newconfig;
	nvlist_t *oldnvroot, *newnvroot;

	newconfig = zpool_get_config(zhp, &oldconfig);

	if (cb->cb_iteration == 1)
		oldconfig = NULL;

	verify(nvlist_lookup_nvlist(newconfig, ZPOOL_CONFIG_VDEV_TREE,
	    &newnvroot) == 0);

	if (oldconfig == NULL)
		oldnvroot = NULL;
	else
		verify(nvlist_lookup_nvlist(oldconfig, ZPOOL_CONFIG_VDEV_TREE,
		    &oldnvroot) == 0);

	/*
	 * Print out the statistics for the pool.
	 */
	print_vdev_stats(zhp, zpool_get_name(zhp), oldnvroot, newnvroot, cb, 0);

	if (cb->cb_verbose)
		print_iostat_separator(cb);

	return (0);
}

int
get_namewidth(zpool_handle_t *zhp, void *data)
{
	iostat_cbdata_t *cb = data;
	nvlist_t *config, *nvroot;

	if ((config = zpool_get_config(zhp, NULL)) != NULL) {
		verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
		    &nvroot) == 0);
		if (!cb->cb_verbose)
			cb->cb_namewidth = strlen(zpool_get_name(zhp));
		else
			cb->cb_namewidth = max_width(zhp, nvroot, 0, 0);
	}

	/*
	 * The width must fall into the range [10,38].  The upper limit is the
	 * maximum we can have and still fit in 80 columns.
	 */
	if (cb->cb_namewidth < 10)
		cb->cb_namewidth = 10;
	if (cb->cb_namewidth > 38)
		cb->cb_namewidth = 38;

	return (0);
}

/*
 * zpool iostat [-T d|u] [-v] [pool] ... [interval [count]]
 *
 *	-T	Display a timestamp in date(1) or Unix format
 *	-v	Display statistics for individual vdevs
 *
 * This command can be tricky because we want to be able to deal with pool
 * creation/destruction as well as vdev configuration changes.  The bulk of this
 * processing is handled by the pool_list_* routines in zpool_iter.c.  We rely
 * on pool_list_update() to detect the addition of new pools.  Configuration
 * changes are all handled within libzfs.
 */
int
zpool_do_iostat(int argc, char **argv)
{
	int c;
	int ret;
	int npools;
	unsigned long interval = 0, count = 0;
	zpool_list_t *list;
	boolean_t verbose = B_FALSE;
	iostat_cbdata_t cb;

	/* check options */
	while ((c = getopt(argc, argv, "T:v")) != -1) {
		switch (c) {
		case 'T':
			if (optarg) {
				if (*optarg == 'u')
					timestamp_fmt = UDATE;
				else if (*optarg == 'd')
					timestamp_fmt = DDATE;
				else
					usage(B_FALSE);
			} else {
				usage(B_FALSE);
			}
			break;
		case 'v':
			verbose = B_TRUE;
			break;
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	argc -= optind;
	argv += optind;

	/*
	 * Determine if the last argument is an integer or a pool name
	 */
	if (argc > 0 && isdigit(argv[argc - 1][0])) {
		char *end;

		errno = 0;
		interval = strtoul(argv[argc - 1], &end, 10);

		if (*end == '\0' && errno == 0) {
			if (interval == 0) {
				(void) fprintf(stderr, gettext("interval "
				    "cannot be zero\n"));
				usage(B_FALSE);
			}

			/*
			 * Ignore the last parameter
			 */
			argc--;
		} else {
			/*
			 * If this is not a valid number, just plow on.  The
			 * user will get a more informative error message later
			 * on.
			 */
			interval = 0;
		}
	}

	/*
	 * If the last argument is also an integer, then we have both a count
	 * and an integer.
	 */
	if (argc > 0 && isdigit(argv[argc - 1][0])) {
		char *end;

		errno = 0;
		count = interval;
		interval = strtoul(argv[argc - 1], &end, 10);

		if (*end == '\0' && errno == 0) {
			if (interval == 0) {
				(void) fprintf(stderr, gettext("interval "
				    "cannot be zero\n"));
				usage(B_FALSE);
			}

			/*
			 * Ignore the last parameter
			 */
			argc--;
		} else {
			interval = 0;
		}
	}

	/*
	 * Construct the list of all interesting pools.
	 */
	ret = 0;
	if ((list = pool_list_get(argc, argv, NULL, &ret)) == NULL)
		return (1);

	if (pool_list_count(list) == 0 && argc != 0) {
		pool_list_free(list);
		return (1);
	}

	if (pool_list_count(list) == 0 && interval == 0) {
		pool_list_free(list);
		(void) fprintf(stderr, gettext("no pools available\n"));
		return (1);
	}

	/*
	 * Enter the main iostat loop.
	 */
	cb.cb_list = list;
	cb.cb_verbose = verbose;
	cb.cb_iteration = 0;
	cb.cb_namewidth = 0;

	for (;;) {
		pool_list_update(list);

		if ((npools = pool_list_count(list)) == 0)
			break;

		/*
		 * Refresh all statistics.  This is done as an explicit step
		 * before calculating the maximum name width, so that any
		 * configuration changes are properly accounted for.
		 */
		(void) pool_list_iter(list, B_FALSE, refresh_iostat, &cb);

		/*
		 * Iterate over all pools to determine the maximum width
		 * for the pool / device name column across all pools.
		 */
		cb.cb_namewidth = 0;
		(void) pool_list_iter(list, B_FALSE, get_namewidth, &cb);

		if (timestamp_fmt != NODATE)
			print_timestamp(timestamp_fmt);

		/*
		 * If it's the first time, or verbose mode, print the header.
		 */
		if (++cb.cb_iteration == 1 || verbose)
			print_iostat_header(&cb);

		(void) pool_list_iter(list, B_FALSE, print_iostat, &cb);

		/*
		 * If there's more than one pool, and we're not in verbose mode
		 * (which prints a separator for us), then print a separator.
		 */
		if (npools > 1 && !verbose)
			print_iostat_separator(&cb);

		if (verbose)
			(void) printf("\n");

		/*
		 * Flush the output so that redirection to a file isn't buffered
		 * indefinitely.
		 */
		(void) fflush(stdout);

		if (interval == 0)
			break;

		if (count != 0 && --count == 0)
			break;

		(void) sleep(interval);
	}

	pool_list_free(list);

	return (ret);
}

typedef struct list_cbdata {
	boolean_t	cb_scripted;
	boolean_t	cb_first;
	zprop_list_t	*cb_proplist;
} list_cbdata_t;

/*
 * Given a list of columns to display, output appropriate headers for each one.
 */
static void
print_header(zprop_list_t *pl)
{
	const char *header;
	boolean_t first = B_TRUE;
	boolean_t right_justify;

	for (; pl != NULL; pl = pl->pl_next) {
		if (pl->pl_prop == ZPROP_INVAL)
			continue;

		if (!first)
			(void) printf("  ");
		else
			first = B_FALSE;

		header = zpool_prop_column_name(pl->pl_prop);
		right_justify = zpool_prop_align_right(pl->pl_prop);

		if (pl->pl_next == NULL && !right_justify)
			(void) printf("%s", header);
		else if (right_justify)
			(void) printf("%*s", pl->pl_width, header);
		else
			(void) printf("%-*s", pl->pl_width, header);
	}

	(void) printf("\n");
}

/*
 * Given a pool and a list of properties, print out all the properties according
 * to the described layout.
 */
static void
print_pool(zpool_handle_t *zhp, zprop_list_t *pl, int scripted)
{
	boolean_t first = B_TRUE;
	char property[ZPOOL_MAXPROPLEN];
	char *propstr;
	boolean_t right_justify;
	int width;

	for (; pl != NULL; pl = pl->pl_next) {
		if (!first) {
			if (scripted)
				(void) printf("\t");
			else
				(void) printf("  ");
		} else {
			first = B_FALSE;
		}

		right_justify = B_FALSE;
		if (pl->pl_prop != ZPROP_INVAL) {
			if (zpool_get_prop(zhp, pl->pl_prop, property,
			    sizeof (property), NULL) != 0)
				propstr = "-";
			else
				propstr = property;

			right_justify = zpool_prop_align_right(pl->pl_prop);
		} else {
			propstr = "-";
		}

		width = pl->pl_width;

		/*
		 * If this is being called in scripted mode, or if this is the
		 * last column and it is left-justified, don't include a width
		 * format specifier.
		 */
		if (scripted || (pl->pl_next == NULL && !right_justify))
			(void) printf("%s", propstr);
		else if (right_justify)
			(void) printf("%*s", width, propstr);
		else
			(void) printf("%-*s", width, propstr);
	}

	(void) printf("\n");
}

/*
 * Generic callback function to list a pool.
 */
int
list_callback(zpool_handle_t *zhp, void *data)
{
	list_cbdata_t *cbp = data;

	if (cbp->cb_first) {
		if (!cbp->cb_scripted)
			print_header(cbp->cb_proplist);
		cbp->cb_first = B_FALSE;
	}

	print_pool(zhp, cbp->cb_proplist, cbp->cb_scripted);

	return (0);
}

/*
 * zpool list [-H] [-o prop[,prop]*] [pool] ...
 *
 *	-H	Scripted mode.  Don't display headers, and separate properties
 *		by a single tab.
 *	-o	List of properties to display.  Defaults to
 *		"name,size,used,available,capacity,health,altroot"
 *
 * List all pools in the system, whether or not they're healthy.  Output space
 * statistics for each one, as well as health status summary.
 */
int
zpool_do_list(int argc, char **argv)
{
	int c;
	int ret;
	list_cbdata_t cb = { 0 };
	static char default_props[] =
	    "name,size,used,available,capacity,health,altroot";
	char *props = default_props;

	/* check options */
	while ((c = getopt(argc, argv, ":Ho:")) != -1) {
		switch (c) {
		case 'H':
			cb.cb_scripted = B_TRUE;
			break;
		case 'o':
			props = optarg;
			break;
		case ':':
			(void) fprintf(stderr, gettext("missing argument for "
			    "'%c' option\n"), optopt);
			usage(B_FALSE);
			break;
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	argc -= optind;
	argv += optind;

	if (zprop_get_list(g_zfs, props, &cb.cb_proplist, ZFS_TYPE_POOL) != 0)
		usage(B_FALSE);

	cb.cb_first = B_TRUE;

	ret = for_each_pool(argc, argv, B_TRUE, &cb.cb_proplist,
	    list_callback, &cb);

	zprop_free_list(cb.cb_proplist);

	if (argc == 0 && cb.cb_first && !cb.cb_scripted) {
		(void) printf(gettext("no pools available\n"));
		return (0);
	}

	return (ret);
}

static nvlist_t *
zpool_get_vdev_by_name(nvlist_t *nv, char *name)
{
	nvlist_t **child;
	uint_t c, children;
	nvlist_t *match;
	char *path;

	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
	    &child, &children) != 0) {
		verify(nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0);
		if (strncmp(name, "/dev/dsk/", 9) == 0)
			name += 9;
		if (strncmp(path, "/dev/dsk/", 9) == 0)
			path += 9;
		if (strcmp(name, path) == 0)
			return (nv);
		return (NULL);
	}

	for (c = 0; c < children; c++)
		if ((match = zpool_get_vdev_by_name(child[c], name)) != NULL)
			return (match);

	return (NULL);
}

static int
zpool_do_attach_or_replace(int argc, char **argv, int replacing)
{
	boolean_t force = B_FALSE;
	int c;
	nvlist_t *nvroot;
	char *poolname, *old_disk, *new_disk;
	zpool_handle_t *zhp;
	int ret;

	/* check options */
	while ((c = getopt(argc, argv, "f")) != -1) {
		switch (c) {
		case 'f':
			force = B_TRUE;
			break;
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
		(void) fprintf(stderr, gettext("missing pool name argument\n"));
		usage(B_FALSE);
	}

	poolname = argv[0];

	if (argc < 2) {
		(void) fprintf(stderr,
		    gettext("missing <device> specification\n"));
		usage(B_FALSE);
	}

	old_disk = argv[1];

	if (argc < 3) {
		if (!replacing) {
			(void) fprintf(stderr,
			    gettext("missing <new_device> specification\n"));
			usage(B_FALSE);
		}
		new_disk = old_disk;
		argc -= 1;
		argv += 1;
	} else {
		new_disk = argv[2];
		argc -= 2;
		argv += 2;
	}

	if (argc > 1) {
		(void) fprintf(stderr, gettext("too many arguments\n"));
		usage(B_FALSE);
	}

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
		return (1);

	if (zpool_get_config(zhp, NULL) == NULL) {
		(void) fprintf(stderr, gettext("pool '%s' is unavailable\n"),
		    poolname);
		zpool_close(zhp);
		return (1);
	}

	nvroot = make_root_vdev(zhp, force, B_FALSE, replacing, B_FALSE,
	    argc, argv);
	if (nvroot == NULL) {
		zpool_close(zhp);
		return (1);
	}

	ret = zpool_vdev_attach(zhp, old_disk, new_disk, nvroot, replacing);

	nvlist_free(nvroot);
	zpool_close(zhp);

	return (ret);
}

/*
 * zpool replace [-f] <pool> <device> <new_device>
 *
 *	-f	Force attach, even if <new_device> appears to be in use.
 *
 * Replace <device> with <new_device>.
 */
/* ARGSUSED */
int
zpool_do_replace(int argc, char **argv)
{
	return (zpool_do_attach_or_replace(argc, argv, B_TRUE));
}

/*
 * zpool attach [-f] <pool> <device> <new_device>
 *
 *	-f	Force attach, even if <new_device> appears to be in use.
 *
 * Attach <new_device> to the mirror containing <device>.  If <device> is not
 * part of a mirror, then <device> will be transformed into a mirror of
 * <device> and <new_device>.  In either case, <new_device> will begin life
 * with a DTL of [0, now], and will immediately begin to resilver itself.
 */
int
zpool_do_attach(int argc, char **argv)
{
	return (zpool_do_attach_or_replace(argc, argv, B_FALSE));
}

/*
 * zpool detach [-f] <pool> <device>
 *
 *	-f	Force detach of <device>, even if DTLs argue against it
 *		(not supported yet)
 *
 * Detach a device from a mirror.  The operation will be refused if <device>
 * is the last device in the mirror, or if the DTLs indicate that this device
 * has the only valid copy of some data.
 */
/* ARGSUSED */
int
zpool_do_detach(int argc, char **argv)
{
	int c;
	char *poolname, *path;
	zpool_handle_t *zhp;
	int ret;

	/* check options */
	while ((c = getopt(argc, argv, "f")) != -1) {
		switch (c) {
		case 'f':
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
		(void) fprintf(stderr, gettext("missing pool name argument\n"));
		usage(B_FALSE);
	}

	if (argc < 2) {
		(void) fprintf(stderr,
		    gettext("missing <device> specification\n"));
		usage(B_FALSE);
	}

	poolname = argv[0];
	path = argv[1];

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
		return (1);

	ret = zpool_vdev_detach(zhp, path);

	zpool_close(zhp);

	return (ret);
}

/*
 * zpool online <pool> <device> ...
 */
int
zpool_do_online(int argc, char **argv)
{
	int c, i;
	char *poolname;
	zpool_handle_t *zhp;
	int ret = 0;
	vdev_state_t newstate;
	int flags = 0;

	/* check options */
	while ((c = getopt(argc, argv, "et")) != -1) {
		switch (c) {
		case 'e':
			flags |= ZFS_ONLINE_EXPAND;
			break;
		case 't':
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
		(void) fprintf(stderr, gettext("missing pool name\n"));
		usage(B_FALSE);
	}
	if (argc < 2) {
		(void) fprintf(stderr, gettext("missing device name\n"));
		usage(B_FALSE);
	}

	poolname = argv[0];

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
		return (1);

	for (i = 1; i < argc; i++) {
		if (zpool_vdev_online(zhp, argv[i], flags, &newstate) == 0) {
			if (newstate != VDEV_STATE_HEALTHY) {
				(void) printf(gettext("warning: device '%s' "
				    "onlined, but remains in faulted state\n"),
				    argv[i]);
				if (newstate == VDEV_STATE_FAULTED)
					(void) printf(gettext("use 'zpool "
					    "clear' to restore a faulted "
					    "device\n"));
				else
					(void) printf(gettext("use 'zpool "
					    "replace' to replace devices "
					    "that are no longer present\n"));
			}
		} else {
			ret = 1;
		}
	}

	zpool_close(zhp);

	return (ret);
}

/*
 * zpool offline [-ft] <pool> <device> ...
 *
 *	-f	Force the device into the offline state, even if doing
 *		so would appear to compromise pool availability.
 *		(not supported yet)
 *
 *	-t	Only take the device off-line temporarily.  The offline
 *		state will not be persistent across reboots.
 */
/* ARGSUSED */
int
zpool_do_offline(int argc, char **argv)
{
	int c, i;
	char *poolname;
	zpool_handle_t *zhp;
	int ret = 0;
	boolean_t istmp = B_FALSE;

	/* check options */
	while ((c = getopt(argc, argv, "ft")) != -1) {
		switch (c) {
		case 't':
			istmp = B_TRUE;
			break;
		case 'f':
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	argc -= optind;
	argv += optind;

	/* get pool name and check number of arguments */
	if (argc < 1) {
		(void) fprintf(stderr, gettext("missing pool name\n"));
		usage(B_FALSE);
	}
	if (argc < 2) {
		(void) fprintf(stderr, gettext("missing device name\n"));
		usage(B_FALSE);
	}

	poolname = argv[0];

	if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
		return (1);

	for (i = 1; i < argc; i++) {
		if (zpool_vdev_offline(zhp, argv[i], istmp) != 0)
			ret = 1;
	}

	zpool_close(zhp);

	return (ret);
}

/*
 * zpool clear <pool> [device]
 *
 * Clear all errors associated with a pool or a particular device.
 */
int
zpool_do_clear(int argc, char **argv)
{
	int ret = 0;
	zpool_handle_t *zhp;
	char *pool, *device;

	if (argc < 2) {
		(void) fprintf(stderr, gettext("missing pool name\n"));
		usage(B_FALSE);
	}

	if (argc > 3) {
		(void) fprintf(stderr, gettext("too many arguments\n"));
		usage(B_FALSE);
	}

	pool = argv[1];
	device = argc == 3 ? argv[2] : NULL;

	if ((zhp = zpool_open_canfail(g_zfs, pool)) == NULL)
		return (1);

	if (zpool_clear(zhp, device) != 0)
		ret = 1;

	zpool_close(zhp);

	return (ret);
}

typedef struct scrub_cbdata {
	int	cb_type;
	int	cb_argc;
	char	**cb_argv;
} scrub_cbdata_t;

int
scrub_callback(zpool_handle_t *zhp, void *data)
{
	scrub_cbdata_t *cb = data;
	int err;

	/*
	 * Ignore faulted pools.
	 */
	if (zpool_get_state(zhp) == POOL_STATE_UNAVAIL) {
		(void) fprintf(stderr, gettext("cannot scrub '%s': pool is "
		    "currently unavailable\n"), zpool_get_name(zhp));
		return (1);
	}

	err = zpool_scrub(zhp, cb->cb_type);

	return (err != 0);
}

/*
 * zpool scrub [-s] <pool> ...
 *
 *	-s	Stop.  Stops any in-progress scrub.
 */
int
zpool_do_scrub(int argc, char **argv)
{
	int c;
	scrub_cbdata_t cb;

	cb.cb_type = POOL_SCRUB_EVERYTHING;

	/* check options */
	while ((c = getopt(argc, argv, "s")) != -1) {
		switch (c) {
		case 's':
			cb.cb_type = POOL_SCRUB_NONE;
			break;
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	cb.cb_argc = argc;
	cb.cb_argv = argv;
	argc -= optind;
	argv += optind;

	if (argc < 1) {
		(void) fprintf(stderr, gettext("missing pool name argument\n"));
		usage(B_FALSE);
	}

	return (for_each_pool(argc, argv, B_TRUE, NULL, scrub_callback, &cb));
}

typedef struct status_cbdata {
	int		cb_count;
	boolean_t	cb_allpools;
	boolean_t	cb_verbose;
	boolean_t	cb_explain;
	boolean_t	cb_first;
} status_cbdata_t;

/*
 * Print out detailed scrub status.
 */
void
print_scrub_status(nvlist_t *nvroot)
{
	vdev_stat_t *vs;
	uint_t vsc;
	time_t start, end, now;
	double fraction_done;
	uint64_t examined, total, minutes_left, minutes_taken;
	char *scrub_type;

	verify(nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_STATS,
	    (uint64_t **)&vs, &vsc) == 0);

	/*
	 * If there's never been a scrub, there's not much to say.
	 */
	if (vs->vs_scrub_end == 0 && vs->vs_scrub_type == POOL_SCRUB_NONE) {
		(void) printf(gettext("none requested\n"));
		return;
	}

	scrub_type = (vs->vs_scrub_type == POOL_SCRUB_RESILVER) ?
	    "resilver" : "scrub";

	start = vs->vs_scrub_start;
	end = vs->vs_scrub_end;
	now = time(NULL);
	examined = vs->vs_scrub_examined;
	total = vs->vs_alloc;

	if (end != 0) {
		minutes_taken = (uint64_t)((end - start) / 60);

		(void) printf(gettext("%s %s after %lluh%um with %llu errors "
		    "on %s"),
		    scrub_type, vs->vs_scrub_complete ? "completed" : "stopped",
		    (u_longlong_t)(minutes_taken / 60),
		    (uint_t)(minutes_taken % 60),
		    (u_longlong_t)vs->vs_scrub_errors, ctime(&end));
		return;
	}

	if (examined == 0)
		examined = 1;
	if (examined > total)
		total = examined;

	fraction_done = (double)examined / total;
	minutes_left = (uint64_t)((now - start) *
	    (1 - fraction_done) / fraction_done / 60);
	minutes_taken = (uint64_t)((now - start) / 60);

	(void) printf(gettext("%s in progress for %lluh%um, %.2f%% done, "
	    "%lluh%um to go\n"),
	    scrub_type, (u_longlong_t)(minutes_taken / 60),
	    (uint_t)(minutes_taken % 60), 100 * fraction_done,
	    (u_longlong_t)(minutes_left / 60), (uint_t)(minutes_left % 60));
}

static void
print_error_log(zpool_handle_t *zhp)
{
	nvlist_t *nverrlist = NULL;
	nvpair_t *elem;
	char *pathname;
	size_t len = MAXPATHLEN * 2;

	if (zpool_get_errlog(zhp, &nverrlist) != 0) {
		(void) printf("errors: List of errors unavailable "
		    "(insufficient privileges)\n");
		return;
	}

	(void) printf("errors: Permanent errors have been "
	    "detected in the following files:\n\n");

	pathname = safe_malloc(len);
	elem = NULL;
	while ((elem = nvlist_next_nvpair(nverrlist, elem)) != NULL) {
		nvlist_t *nv;
		uint64_t dsobj, obj;

		verify(nvpair_value_nvlist(elem, &nv) == 0);
		verify(nvlist_lookup_uint64(nv, ZPOOL_ERR_DATASET,
		    &dsobj) == 0);
		verify(nvlist_lookup_uint64(nv, ZPOOL_ERR_OBJECT,
		    &obj) == 0);
		zpool_obj_to_path(zhp, dsobj, obj, pathname, len);
		(void) printf("%7s %s\n", "", pathname);
	}
	free(pathname);
	nvlist_free(nverrlist);
}

static void
print_spares(zpool_handle_t *zhp, nvlist_t **spares, uint_t nspares,
    int namewidth)
{
	uint_t i;
	char *name;

	if (nspares == 0)
		return;

	(void) printf(gettext("\tspares\n"));

	for (i = 0; i < nspares; i++) {
		name = zpool_vdev_name(g_zfs, zhp, spares[i]);
		print_status_config(zhp, name, spares[i],
		    namewidth, 2, B_TRUE);
		free(name);
	}
}

static void
print_l2cache(zpool_handle_t *zhp, nvlist_t **l2cache, uint_t nl2cache,
    int namewidth)
{
	uint_t i;
	char *name;

	if (nl2cache == 0)
		return;

	(void) printf(gettext("\tcache\n"));

	for (i = 0; i < nl2cache; i++) {
		name = zpool_vdev_name(g_zfs, zhp, l2cache[i]);
		print_status_config(zhp, name, l2cache[i],
		    namewidth, 2, B_FALSE);
		free(name);
	}
}

/*
 * Display a summary of pool status.  Displays a summary such as:
 *
 *        pool: tank
 *	status: DEGRADED
 *	reason: One or more devices ...
 *         see: http://www.sun.com/msg/ZFS-xxxx-01
 *	config:
 *		mirror		DEGRADED
 *                c1t0d0	OK
 *                c2t0d0	UNAVAIL
 *
 * When given the '-v' option, we print out the complete config.  If the '-e'
 * option is specified, then we print out error rate information as well.
 */
int
status_callback(zpool_handle_t *zhp, void *data)
{
	status_cbdata_t *cbp = data;
	nvlist_t *config, *nvroot;
	char *msgid;
	int reason;
	const char *health;
	uint_t c;
	vdev_stat_t *vs;

	config = zpool_get_config(zhp, NULL);
	reason = zpool_get_status(zhp, &msgid);

	cbp->cb_count++;

	/*
	 * If we were given 'zpool status -x', only report those pools with
	 * problems.
	 */
	if (reason == ZPOOL_STATUS_OK && cbp->cb_explain) {
		if (!cbp->cb_allpools) {
			(void) printf(gettext("pool '%s' is healthy\n"),
			    zpool_get_name(zhp));
			if (cbp->cb_first)
				cbp->cb_first = B_FALSE;
		}
		return (0);
	}

	if (cbp->cb_first)
		cbp->cb_first = B_FALSE;
	else
		(void) printf("\n");

	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	    &nvroot) == 0);
	verify(nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_STATS,
	    (uint64_t **)&vs, &c) == 0);
	health = zpool_state_to_name(vs->vs_state, vs->vs_aux);

	(void) printf(gettext("  pool: %s\n"), zpool_get_name(zhp));
	(void) printf(gettext(" state: %s\n"), health);

	switch (reason) {
	case ZPOOL_STATUS_MISSING_DEV_R:
		(void) printf(gettext("status: One or more devices could not "
		    "be opened.  Sufficient replicas exist for\n\tthe pool to "
		    "continue functioning in a degraded state.\n"));
		(void) printf(gettext("action: Attach the missing device and "
		    "online it using 'zpool online'.\n"));
		break;

	case ZPOOL_STATUS_MISSING_DEV_NR:
		(void) printf(gettext("status: One or more devices could not "
		    "be opened.  There are insufficient\n\treplicas for the "
		    "pool to continue functioning.\n"));
		(void) printf(gettext("action: Attach the missing device and "
		    "online it using 'zpool online'.\n"));
		break;

	case ZPOOL_STATUS_CORRUPT_LABEL_R:
		(void) printf(gettext("status: One or more devices could not "
		    "be used because the label is missing or\n\tinvalid.  "
		    "Sufficient replicas exist for the pool to continue\n\t"
		    "functioning in a degraded state.\n"));
		(void) printf(gettext("action: Replace the device using "
		    "'zpool replace'.\n"));
		break;

	case ZPOOL_STATUS_CORRUPT_LABEL_NR:
		(void) printf(gettext("status: One or more devices could not "
		    "be used because the label is missing \n\tor invalid.  "
		    "There are insufficient replicas for the pool to "
		    "continue\n\tfunctioning.\n"));
		(void) printf(gettext("action: Destroy and re-create the pool "
		    "from a backup source.\n"));
		break;

	case ZPOOL_STATUS_FAILING_DEV:
		(void) printf(gettext("status: One or more devices has "
		    "experienced an unrecoverable error.  An\n\tattempt was "
		    "made to correct the error.  Applications are "
		    "unaffected.\n"));
		(void) printf(gettext("action: Determine if the device needs "
		    "to be replaced, and clear the errors\n\tusing "
		    "'zpool clear' or replace the device with 'zpool "
		    "replace'.\n"));
		break;

	case ZPOOL_STATUS_OFFLINE_DEV:
		(void) printf(gettext("status: One or more devices has "
		    "been taken offline by the administrator.\n\tSufficient "
		    "replicas exist for the pool to continue functioning in "
		    "a\n\tdegraded state.\n"));
		(void) printf(gettext("action: Online the device using "
		    "'zpool online' or replace the device with\n\t'zpool "
		    "replace'.\n"));
		break;

	case ZPOOL_STATUS_REMOVED_DEV:
		(void) printf(gettext("status: One or more devices has "
		    "been removed by the administrator.\n\tSufficient "
		    "replicas exist for the pool to continue functioning in "
		    "a\n\tdegraded state.\n"));
		(void) printf(gettext("action: Online the device using "
		    "'zpool online' or replace the device with\n\t'zpool "
		    "replace'.\n"));
		break;


	case ZPOOL_STATUS_RESILVERING:
		(void) printf(gettext("status: One or more devices is "
		    "currently being resilvered.  The pool will\n\tcontinue "
		    "to function, possibly in a degraded state.\n"));
		(void) printf(gettext("action: Wait for the resilver to "
		    "complete.\n"));
		break;

	case ZPOOL_STATUS_CORRUPT_DATA:
		(void) printf(gettext("status: One or more devices has "
		    "experienced an error resulting in data\n\tcorruption.  "
		    "Applications may be affected.\n"));
		(void) printf(gettext("action: Restore the file in question "
		    "if possible.  Otherwise restore the\n\tentire pool from "
		    "backup.\n"));
		break;

	case ZPOOL_STATUS_CORRUPT_POOL:
		(void) printf(gettext("status: The pool metadata is corrupted "
		    "and the pool cannot be opened.\n"));
		(void) printf(gettext("action: Destroy and re-create the pool "
		    "from a backup source.\n"));
		break;

	case ZPOOL_STATUS_VERSION_OLDER:
		(void) printf(gettext("status: The pool is formatted using an "
		    "older on-disk format.  The pool can\n\tstill be used, but "
		    "some features are unavailable.\n"));
		(void) printf(gettext("action: Upgrade the pool using 'zpool "
		    "upgrade'.  Once this is done, the\n\tpool will no longer "
		    "be accessible on older software versions.\n"));
		break;

	case ZPOOL_STATUS_VERSION_NEWER:
		(void) printf(gettext("status: The pool has been upgraded to a "
		    "newer, incompatible on-disk version.\n\tThe pool cannot "
		    "be accessed on this system.\n"));
		(void) printf(gettext("action: Access the pool from a system "
		    "running more recent software, or\n\trestore the pool from "
		    "backup.\n"));
		break;

	case ZPOOL_STATUS_FAULTED_DEV_R:
		(void) printf(gettext("status: One or more devices are "
		    "faulted in response to persistent errors.\n\tSufficient "
		    "replicas exist for the pool to continue functioning "
		    "in a\n\tdegraded state.\n"));
		(void) printf(gettext("action: Replace the faulted device, "
		    "or use 'zpool clear' to mark the device\n\trepaired.\n"));
		break;

	case ZPOOL_STATUS_FAULTED_DEV_NR:
		(void) printf(gettext("status: One or more devices are "
		    "faulted in response to persistent errors.  There are "
		    "insufficient replicas for the pool to\n\tcontinue "
		    "functioning.\n"));
		(void) printf(gettext("action: Destroy and re-create the pool "
		    "from a backup source.  Manually marking the device\n"
		    "\trepaired using 'zpool clear' may allow some data "
		    "to be recovered.\n"));
		break;

	case ZPOOL_STATUS_IO_FAILURE_WAIT:
	case ZPOOL_STATUS_IO_FAILURE_CONTINUE:
		(void) printf(gettext("status: One or more devices are "
		    "faulted in response to IO failures.\n"));
		(void) printf(gettext("action: Make sure the affected devices "
		    "are connected, then run 'zpool clear'.\n"));
		break;

	case ZPOOL_STATUS_BAD_LOG:
		(void) printf(gettext("status: An intent log record "
		    "could not be read.\n"
		    "\tWaiting for adminstrator intervention to fix the "
		    "faulted pool.\n"));
		(void) printf(gettext("action: Either restore the affected "
		    "device(s) and run 'zpool online',\n"
		    "\tor ignore the intent log records by running "
		    "'zpool clear'.\n"));
		break;

	default:
		/*
		 * The remaining errors can't actually be generated, yet.
		 */
		assert(reason == ZPOOL_STATUS_OK);
	}

	if (msgid != NULL)
		(void) printf(gettext("   see: http://www.sun.com/msg/%s\n"),
		    msgid);

	if (config != NULL) {
		int namewidth;
		uint64_t nerr;
		nvlist_t **spares, **l2cache;
		uint_t nspares, nl2cache;


		(void) printf(gettext(" scrub: "));
		print_scrub_status(nvroot);

		namewidth = max_width(zhp, nvroot, 0, 0);
		if (namewidth < 10)
			namewidth = 10;

		(void) printf(gettext("config:\n\n"));
		(void) printf(gettext("\t%-*s  %-8s %5s %5s %5s\n"), namewidth,
		    "NAME", "STATE", "READ", "WRITE", "CKSUM");
		print_status_config(zhp, zpool_get_name(zhp), nvroot,
		    namewidth, 0, B_FALSE);

		if (num_logs(nvroot) > 0)
			print_logs(zhp, nvroot, namewidth, B_TRUE);
		if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
		    &l2cache, &nl2cache) == 0)
			print_l2cache(zhp, l2cache, nl2cache, namewidth);

		if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES,
		    &spares, &nspares) == 0)
			print_spares(zhp, spares, nspares, namewidth);

		if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_ERRCOUNT,
		    &nerr) == 0) {
			nvlist_t *nverrlist = NULL;

			/*
			 * If the approximate error count is small, get a
			 * precise count by fetching the entire log and
			 * uniquifying the results.
			 */
			if (nerr > 0 && nerr < 100 && !cbp->cb_verbose &&
			    zpool_get_errlog(zhp, &nverrlist) == 0) {
				nvpair_t *elem;

				elem = NULL;
				nerr = 0;
				while ((elem = nvlist_next_nvpair(nverrlist,
				    elem)) != NULL) {
					nerr++;
				}
			}
			nvlist_free(nverrlist);

			(void) printf("\n");

			if (nerr == 0)
				(void) printf(gettext("errors: No known data "
				    "errors\n"));
			else if (!cbp->cb_verbose)
				(void) printf(gettext("errors: %llu data "
				    "errors, use '-v' for a list\n"),
				    (u_longlong_t)nerr);
			else
				print_error_log(zhp);
		}
	} else {
		(void) printf(gettext("config: The configuration cannot be "
		    "determined.\n"));
	}

	return (0);
}

/*
 * zpool status [-vx] [pool] ...
 *
 *	-v	Display complete error logs
 *	-x	Display only pools with potential problems
 *
 * Describes the health status of all pools or some subset.
 */
int
zpool_do_status(int argc, char **argv)
{
	int c;
	int ret;
	status_cbdata_t cb = { 0 };

	/* check options */
	while ((c = getopt(argc, argv, "vx")) != -1) {
		switch (c) {
		case 'v':
			cb.cb_verbose = B_TRUE;
			break;
		case 'x':
			cb.cb_explain = B_TRUE;
			break;
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	argc -= optind;
	argv += optind;

	cb.cb_first = B_TRUE;

	if (argc == 0)
		cb.cb_allpools = B_TRUE;

	ret = for_each_pool(argc, argv, B_TRUE, NULL, status_callback, &cb);

	if (argc == 0 && cb.cb_count == 0)
		(void) printf(gettext("no pools available\n"));
	else if (cb.cb_explain && cb.cb_first && cb.cb_allpools)
		(void) printf(gettext("all pools are healthy\n"));

	return (ret);
}

typedef struct upgrade_cbdata {
	int	cb_all;
	int	cb_first;
	int	cb_newer;
	int	cb_argc;
	uint64_t cb_version;
	char	**cb_argv;
} upgrade_cbdata_t;

static int
upgrade_cb(zpool_handle_t *zhp, void *arg)
{
	upgrade_cbdata_t *cbp = arg;
	nvlist_t *config;
	uint64_t version;
	int ret = 0;

	config = zpool_get_config(zhp, NULL);
	verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
	    &version) == 0);

	if (!cbp->cb_newer && version < SPA_VERSION) {
		if (!cbp->cb_all) {
			if (cbp->cb_first) {
				(void) printf(gettext("The following pools are "
				    "out of date, and can be upgraded.  After "
				    "being\nupgraded, these pools will no "
				    "longer be accessible by older software "
				    "versions.\n\n"));
				(void) printf(gettext("VER  POOL\n"));
				(void) printf(gettext("---  ------------\n"));
				cbp->cb_first = B_FALSE;
			}

			(void) printf("%2llu   %s\n", (u_longlong_t)version,
			    zpool_get_name(zhp));
		} else {
			cbp->cb_first = B_FALSE;
			ret = zpool_upgrade(zhp, cbp->cb_version);
			if (!ret) {
				(void) printf(gettext("Successfully upgraded "
				    "'%s'\n\n"), zpool_get_name(zhp));
			}
		}
	} else if (cbp->cb_newer && version > SPA_VERSION) {
		assert(!cbp->cb_all);

		if (cbp->cb_first) {
			(void) printf(gettext("The following pools are "
			    "formatted using a newer software version and\n"
			    "cannot be accessed on the current system.\n\n"));
			(void) printf(gettext("VER  POOL\n"));
			(void) printf(gettext("---  ------------\n"));
			cbp->cb_first = B_FALSE;
		}

		(void) printf("%2llu   %s\n", (u_longlong_t)version,
		    zpool_get_name(zhp));
	}

	zpool_close(zhp);
	return (ret);
}

/* ARGSUSED */
static int
upgrade_one(zpool_handle_t *zhp, void *data)
{
	upgrade_cbdata_t *cbp = data;
	uint64_t cur_version;
	int ret;

	if (strcmp("log", zpool_get_name(zhp)) == 0) {
		(void) printf(gettext("'log' is now a reserved word\n"
		    "Pool 'log' must be renamed using export and import"
		    " to upgrade.\n"));
		return (1);
	}

	cur_version = zpool_get_prop_int(zhp, ZPOOL_PROP_VERSION, NULL);
	if (cur_version > cbp->cb_version) {
		(void) printf(gettext("Pool '%s' is already formatted "
		    "using more current version '%llu'.\n"),
		    zpool_get_name(zhp), cur_version);
		return (0);
	}
	if (cur_version == cbp->cb_version) {
		(void) printf(gettext("Pool '%s' is already formatted "
		    "using the current version.\n"), zpool_get_name(zhp));
		return (0);
	}

	ret = zpool_upgrade(zhp, cbp->cb_version);

	if (!ret) {
		(void) printf(gettext("Successfully upgraded '%s' "
		    "from version %llu to version %llu\n\n"),
		    zpool_get_name(zhp), (u_longlong_t)cur_version,
		    (u_longlong_t)cbp->cb_version);
	}

	return (ret != 0);
}

/*
 * zpool upgrade
 * zpool upgrade -v
 * zpool upgrade [-V version] <-a | pool ...>
 *
 * With no arguments, display downrev'd ZFS pool available for upgrade.
 * Individual pools can be upgraded by specifying the pool, and '-a' will
 * upgrade all pools.
 */
int
zpool_do_upgrade(int argc, char **argv)
{
	int c;
	upgrade_cbdata_t cb = { 0 };
	int ret = 0;
	boolean_t showversions = B_FALSE;
	char *end;


	/* check options */
	while ((c = getopt(argc, argv, ":avV:")) != -1) {
		switch (c) {
		case 'a':
			cb.cb_all = B_TRUE;
			break;
		case 'v':
			showversions = B_TRUE;
			break;
		case 'V':
			cb.cb_version = strtoll(optarg, &end, 10);
			if (*end != '\0' || cb.cb_version > SPA_VERSION ||
			    cb.cb_version < SPA_VERSION_1) {
				(void) fprintf(stderr,
				    gettext("invalid version '%s'\n"), optarg);
				usage(B_FALSE);
			}
			break;
		case ':':
			(void) fprintf(stderr, gettext("missing argument for "
			    "'%c' option\n"), optopt);
			usage(B_FALSE);
			break;
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}

	cb.cb_argc = argc;
	cb.cb_argv = argv;
	argc -= optind;
	argv += optind;

	if (cb.cb_version == 0) {
		cb.cb_version = SPA_VERSION;
	} else if (!cb.cb_all && argc == 0) {
		(void) fprintf(stderr, gettext("-V option is "
		    "incompatible with other arguments\n"));
		usage(B_FALSE);
	}

	if (showversions) {
		if (cb.cb_all || argc != 0) {
			(void) fprintf(stderr, gettext("-v option is "
			    "incompatible with other arguments\n"));
			usage(B_FALSE);
		}
	} else if (cb.cb_all) {
		if (argc != 0) {
			(void) fprintf(stderr, gettext("-a option should not "
			    "be used along with a pool name\n"));
			usage(B_FALSE);
		}
	}

	(void) printf(gettext("This system is currently running "
	    "ZFS pool version %llu.\n\n"), SPA_VERSION);
	cb.cb_first = B_TRUE;
	if (showversions) {
		(void) printf(gettext("The following versions are "
		    "supported:\n\n"));
		(void) printf(gettext("VER  DESCRIPTION\n"));
		(void) printf("---  -----------------------------------------"
		    "---------------\n");
		(void) printf(gettext(" 1   Initial ZFS version\n"));
		(void) printf(gettext(" 2   Ditto blocks "
		    "(replicated metadata)\n"));
		(void) printf(gettext(" 3   Hot spares and double parity "
		    "RAID-Z\n"));
		(void) printf(gettext(" 4   zpool history\n"));
		(void) printf(gettext(" 5   Compression using the gzip "
		    "algorithm\n"));
		(void) printf(gettext(" 6   bootfs pool property\n"));
		(void) printf(gettext(" 7   Separate intent log devices\n"));
		(void) printf(gettext(" 8   Delegated administration\n"));
		(void) printf(gettext(" 9   refquota and refreservation "
		    "properties\n"));
		(void) printf(gettext(" 10  Cache devices\n"));
		(void) printf(gettext(" 11  Improved scrub performance\n"));
		(void) printf(gettext(" 12  Snapshot properties\n"));
		(void) printf(gettext(" 13  snapused property\n"));
		(void) printf(gettext(" 14  passthrough-x aclinherit\n"));
		(void) printf(gettext(" 15  user/group space accounting\n"));
		(void) printf(gettext(" 16  stmf property support\n"));
		(void) printf(gettext(" 17  Triple-parity RAID-Z\n"));
		(void) printf(gettext(" 18  snapshot user holds\n"));
		(void) printf(gettext("For more information on a particular "
		    "version, including supported releases, see:\n\n"));
		(void) printf("http://www.opensolaris.org/os/community/zfs/"
		    "version/N\n\n");
		(void) printf(gettext("Where 'N' is the version number.\n"));
	} else if (argc == 0) {
		int notfound;

		ret = zpool_iter(g_zfs, upgrade_cb, &cb);
		notfound = cb.cb_first;

		if (!cb.cb_all && ret == 0) {
			if (!cb.cb_first)
				(void) printf("\n");
			cb.cb_first = B_TRUE;
			cb.cb_newer = B_TRUE;
			ret = zpool_iter(g_zfs, upgrade_cb, &cb);
			if (!cb.cb_first) {
				notfound = B_FALSE;
				(void) printf("\n");
			}
		}

		if (ret == 0) {
			if (notfound)
				(void) printf(gettext("All pools are formatted "
				    "using this version.\n"));
			else if (!cb.cb_all)
				(void) printf(gettext("Use 'zpool upgrade -v' "
				    "for a list of available versions and "
				    "their associated\nfeatures.\n"));
		}
	} else {
		ret = for_each_pool(argc, argv, B_FALSE, NULL,
		    upgrade_one, &cb);
	}

	return (ret);
}

typedef struct hist_cbdata {
	boolean_t first;
	int longfmt;
	int internal;
} hist_cbdata_t;

char *hist_event_table[LOG_END] = {
	"invalid event",
	"pool create",
	"vdev add",
	"pool remove",
	"pool destroy",
	"pool export",
	"pool import",
	"vdev attach",
	"vdev replace",
	"vdev detach",
	"vdev online",
	"vdev offline",
	"vdev upgrade",
	"pool clear",
	"pool scrub",
	"pool property set",
	"create",
	"clone",
	"destroy",
	"destroy_begin_sync",
	"inherit",
	"property set",
	"quota set",
	"permission update",
	"permission remove",
	"permission who remove",
	"promote",
	"receive",
	"rename",
	"reservation set",
	"replay_inc_sync",
	"replay_full_sync",
	"rollback",
	"snapshot",
	"filesystem version upgrade",
	"refquota set",
	"refreservation set",
	"pool scrub done",
	"user hold",
	"user release",
};

/*
 * Print out the command history for a specific pool.
 */
static int
get_history_one(zpool_handle_t *zhp, void *data)
{
	nvlist_t *nvhis;
	nvlist_t **records;
	uint_t numrecords;
	char *cmdstr;
	char *pathstr;
	uint64_t dst_time;
	time_t tsec;
	struct tm t;
	char tbuf[30];
	int ret, i;
	uint64_t who;
	struct passwd *pwd;
	char *hostname;
	char *zonename;
	char internalstr[MAXPATHLEN];
	hist_cbdata_t *cb = (hist_cbdata_t *)data;
	uint64_t txg;
	uint64_t ievent;

	cb->first = B_FALSE;

	(void) printf(gettext("History for '%s':\n"), zpool_get_name(zhp));

	if ((ret = zpool_get_history(zhp, &nvhis)) != 0)
		return (ret);

	verify(nvlist_lookup_nvlist_array(nvhis, ZPOOL_HIST_RECORD,
	    &records, &numrecords) == 0);
	for (i = 0; i < numrecords; i++) {
		if (nvlist_lookup_uint64(records[i], ZPOOL_HIST_TIME,
		    &dst_time) != 0)
			continue;

		/* is it an internal event or a standard event? */
		if (nvlist_lookup_string(records[i], ZPOOL_HIST_CMD,
		    &cmdstr) != 0) {
			if (cb->internal == 0)
				continue;

			if (nvlist_lookup_uint64(records[i],
			    ZPOOL_HIST_INT_EVENT, &ievent) != 0)
				continue;
			verify(nvlist_lookup_uint64(records[i],
			    ZPOOL_HIST_TXG, &txg) == 0);
			verify(nvlist_lookup_string(records[i],
			    ZPOOL_HIST_INT_STR, &pathstr) == 0);
			if (ievent >= LOG_END)
				continue;
			(void) snprintf(internalstr,
			    sizeof (internalstr),
			    "[internal %s txg:%lld] %s",
			    hist_event_table[ievent], txg,
			    pathstr);
			cmdstr = internalstr;
		}
		tsec = dst_time;
		(void) localtime_r(&tsec, &t);
		(void) strftime(tbuf, sizeof (tbuf), "%F.%T", &t);
		(void) printf("%s %s", tbuf, cmdstr);

		if (!cb->longfmt) {
			(void) printf("\n");
			continue;
		}
		(void) printf(" [");
		if (nvlist_lookup_uint64(records[i],
		    ZPOOL_HIST_WHO, &who) == 0) {
			pwd = getpwuid((uid_t)who);
			if (pwd)
				(void) printf("user %s on",
				    pwd->pw_name);
			else
				(void) printf("user %d on",
				    (int)who);
		} else {
			(void) printf(gettext("no info]\n"));
			continue;
		}
		if (nvlist_lookup_string(records[i],
		    ZPOOL_HIST_HOST, &hostname) == 0) {
			(void) printf(" %s", hostname);
		}
		if (nvlist_lookup_string(records[i],
		    ZPOOL_HIST_ZONE, &zonename) == 0) {
			(void) printf(":%s", zonename);
		}

		(void) printf("]");
		(void) printf("\n");
	}
	(void) printf("\n");
	nvlist_free(nvhis);

	return (ret);
}

/*
 * zpool history <pool>
 *
 * Displays the history of commands that modified pools.
 */


int
zpool_do_history(int argc, char **argv)
{
	hist_cbdata_t cbdata = { 0 };
	int ret;
	int c;

	cbdata.first = B_TRUE;
	/* check options */
	while ((c = getopt(argc, argv, "li")) != -1) {
		switch (c) {
		case 'l':
			cbdata.longfmt = 1;
			break;
		case 'i':
			cbdata.internal = 1;
			break;
		case '?':
			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
			    optopt);
			usage(B_FALSE);
		}
	}
	argc -= optind;
	argv += optind;

	ret = for_each_pool(argc, argv, B_FALSE,  NULL, get_history_one,
	    &cbdata);

	if (argc == 0 && cbdata.first == B_TRUE) {
		(void) printf(gettext("no pools available\n"));
		return (0);
	}

	return (ret);
}

static int
get_callback(zpool_handle_t *zhp, void *data)
{
	zprop_get_cbdata_t *cbp = (zprop_get_cbdata_t *)data;
	char value[MAXNAMELEN];
	zprop_source_t srctype;
	zprop_list_t *pl;

	for (pl = cbp->cb_proplist; pl != NULL; pl = pl->pl_next) {

		/*
		 * Skip the special fake placeholder. This will also skip
		 * over the name property when 'all' is specified.
		 */
		if (pl->pl_prop == ZPOOL_PROP_NAME &&
		    pl == cbp->cb_proplist)
			continue;

		if (zpool_get_prop(zhp, pl->pl_prop,
		    value, sizeof (value), &srctype) != 0)
			continue;

		zprop_print_one_property(zpool_get_name(zhp), cbp,
		    zpool_prop_to_name(pl->pl_prop), value, srctype, NULL);
	}
	return (0);
}

int
zpool_do_get(int argc, char **argv)
{
	zprop_get_cbdata_t cb = { 0 };
	zprop_list_t fake_name = { 0 };
	int ret;

	if (argc < 3)
		usage(B_FALSE);

	cb.cb_first = B_TRUE;
	cb.cb_sources = ZPROP_SRC_ALL;
	cb.cb_columns[0] = GET_COL_NAME;
	cb.cb_columns[1] = GET_COL_PROPERTY;
	cb.cb_columns[2] = GET_COL_VALUE;
	cb.cb_columns[3] = GET_COL_SOURCE;
	cb.cb_type = ZFS_TYPE_POOL;

	if (zprop_get_list(g_zfs, argv[1],  &cb.cb_proplist,
	    ZFS_TYPE_POOL) != 0)
		usage(B_FALSE);

	if (cb.cb_proplist != NULL) {
		fake_name.pl_prop = ZPOOL_PROP_NAME;
		fake_name.pl_width = strlen(gettext("NAME"));
		fake_name.pl_next = cb.cb_proplist;
		cb.cb_proplist = &fake_name;
	}

	ret = for_each_pool(argc - 2, argv + 2, B_TRUE, &cb.cb_proplist,
	    get_callback, &cb);

	if (cb.cb_proplist == &fake_name)
		zprop_free_list(fake_name.pl_next);
	else
		zprop_free_list(cb.cb_proplist);

	return (ret);
}

typedef struct set_cbdata {
	char *cb_propname;
	char *cb_value;
	boolean_t cb_any_successful;
} set_cbdata_t;

int
set_callback(zpool_handle_t *zhp, void *data)
{
	int error;
	set_cbdata_t *cb = (set_cbdata_t *)data;

	error = zpool_set_prop(zhp, cb->cb_propname, cb->cb_value);

	if (!error)
		cb->cb_any_successful = B_TRUE;

	return (error);
}

int
zpool_do_set(int argc, char **argv)
{
	set_cbdata_t cb = { 0 };
	int error;

	if (argc > 1 && argv[1][0] == '-') {
		(void) fprintf(stderr, gettext("invalid option '%c'\n"),
		    argv[1][1]);
		usage(B_FALSE);
	}

	if (argc < 2) {
		(void) fprintf(stderr, gettext("missing property=value "
		    "argument\n"));
		usage(B_FALSE);
	}

	if (argc < 3) {
		(void) fprintf(stderr, gettext("missing pool name\n"));
		usage(B_FALSE);
	}

	if (argc > 3) {
		(void) fprintf(stderr, gettext("too many pool names\n"));
		usage(B_FALSE);
	}

	cb.cb_propname = argv[1];
	cb.cb_value = strchr(cb.cb_propname, '=');
	if (cb.cb_value == NULL) {
		(void) fprintf(stderr, gettext("missing value in "
		    "property=value argument\n"));
		usage(B_FALSE);
	}

	*(cb.cb_value) = '\0';
	cb.cb_value++;

	error = for_each_pool(argc - 2, argv + 2, B_TRUE, NULL,
	    set_callback, &cb);

	return (error);
}

static int
find_command_idx(char *command, int *idx)
{
	int i;

	for (i = 0; i < NCOMMAND; i++) {
		if (command_table[i].name == NULL)
			continue;

		if (strcmp(command, command_table[i].name) == 0) {
			*idx = i;
			return (0);
		}
	}
	return (1);
}

int
main(int argc, char **argv)
{
	int ret;
	int i;
	char *cmdname;

	(void) setlocale(LC_ALL, "");
	(void) textdomain(TEXT_DOMAIN);

	if ((g_zfs = libzfs_init()) == NULL) {
		(void) fprintf(stderr, gettext("internal error: failed to "
		    "initialize ZFS library\n"));
		return (1);
	}

	libzfs_print_on_error(g_zfs, B_TRUE);

	opterr = 0;

	/*
	 * Make sure the user has specified some command.
	 */
	if (argc < 2) {
		(void) fprintf(stderr, gettext("missing command\n"));
		usage(B_FALSE);
	}

	cmdname = argv[1];

	/*
	 * Special case '-?'
	 */
	if (strcmp(cmdname, "-?") == 0)
		usage(B_TRUE);

	zpool_set_history_str("zpool", argc, argv, history_str);
	verify(zpool_stage_history(g_zfs, history_str) == 0);

	/*
	 * Run the appropriate command.
	 */
	if (find_command_idx(cmdname, &i) == 0) {
		current_command = &command_table[i];
		ret = command_table[i].func(argc - 1, argv + 1);
	} else if (strchr(cmdname, '=')) {
		verify(find_command_idx("set", &i) == 0);
		current_command = &command_table[i];
		ret = command_table[i].func(argc, argv);
	} else if (strcmp(cmdname, "freeze") == 0 && argc == 3) {
		/*
		 * 'freeze' is a vile debugging abomination, so we treat
		 * it as such.
		 */
		char buf[16384];
		int fd = open(ZFS_DEV, O_RDWR);
		(void) strcpy((void *)buf, argv[2]);
		return (!!ioctl(fd, ZFS_IOC_POOL_FREEZE, buf));
	} else {
		(void) fprintf(stderr, gettext("unrecognized "
		    "command '%s'\n"), cmdname);
		usage(B_FALSE);
	}

	libzfs_fini(g_zfs);

	/*
	 * The 'ZFS_ABORT' environment variable causes us to dump core on exit
	 * for the purposes of running ::findleaks.
	 */
	if (getenv("ZFS_ABORT") != NULL) {
		(void) printf("dumping core by request\n");
		abort();
	}

	return (ret);
}