Improve `zpool import` search behavior

[mirror_zfs-debian.git] / cmd / zpool / zpool_main.c

/*
 * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
 * Copyright (c) 2011 by Delphix. All rights reserved.
 * Copyright (c) 2012 by Frederik Wessels. All rights reserved.
 */

#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 <sys/fm/util.h>
#include <sys/fm/protocol.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_reguid(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_split(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_events(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_EVENTS,
        HELP_GET,
        HELP_SET,
        HELP_SPLIT,
        HELP_REGUID
} 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            },
        { "split",      zpool_do_split,         HELP_SPLIT              },
        { 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            },
        { "reguid",     zpool_do_reguid,        HELP_REGUID             },
        { NULL },
        { "history",    zpool_do_history,       HELP_HISTORY            },
        { "events",     zpool_do_events,        HELP_EVENTS             },
        { NULL },
        { "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 [-nF] <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 [-d dir | -c cachefile] [-F [-n]] <pool | id>\n"
                    "\timport [-o mntopts] [-o property=value] ... \n"
                    "\t    [-d dir | -c cachefile] [-D] [-f] [-m] [-N] "
                    "[-R root] [-F [-n]] -a\n"
                    "\timport [-o mntopts] [-o property=value] ... \n"
                    "\t    [-d dir | -c cachefile] [-D] [-f] [-m] [-N] "
                    "[-R root] [-F [-n]]\n"
                    "\t    <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[,...]] "
                    "[-T d|u] [pool] ... [interval [count]]\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] [-T d|u] [pool] ... [interval "
                    "[count]]\n"));
        case HELP_UPGRADE:
                return (gettext("\tupgrade\n"
                    "\tupgrade -v\n"
                    "\tupgrade [-V version] <-a | pool ...>\n"));
        case HELP_EVENTS:
                return (gettext("\tevents [-vHfc]\n"));
        case HELP_GET:
                return (gettext("\tget <\"all\" | property[,...]> "
                    "<pool> ...\n"));
        case HELP_SET:
                return (gettext("\tset <property=value> <pool> \n"));
        case HELP_SPLIT:
                return (gettext("\tsplit [-n] [-R altroot] [-o mntopts]\n"
                    "\t    [-o property=value] <pool> <newpool> "
                    "[<device> ...]\n"));
        case HELP_REGUID:
                return (gettext("\treguid <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%-15s  ", 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%-15s  %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], B_FALSE);
                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, NULL, 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 supports removing
 * spares, cache, and log devices from the pool.
 */
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, props, 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, B_TRUE);
        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;
        pool_scan_stat_t *ps = NULL;
        vdev_stat_t *vs;
        char rbuf[6], wbuf[6], cbuf[6];
        char *vname;
        uint64_t notpresent;
        spare_cbdata_t cb;
        char *state;

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

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

                case VDEV_AUX_EXTERNAL:
                        (void) printf(gettext("external device fault"));
                        break;

                case VDEV_AUX_SPLIT_POOL:
                        (void) printf(gettext("split into new pool"));
                        break;

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

        (void) nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_SCAN_STATS,
            (uint64_t **)&ps, &c);

        if (ps && ps->pss_state == DSS_SCANNING &&
            vs->vs_scan_processed != 0 && children == 0) {
                (void) printf(gettext("  (%s)"),
                    (ps->pss_func == POOL_SCAN_RESILVER) ?
                    "resilvering" : "repairing");
        }

        (void) printf("\n");

        for (c = 0; c < children; c++) {
                uint64_t islog = B_FALSE, ishole = B_FALSE;

                /* Don't print logs or holes here */
                (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
                    &islog);
                (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE,
                    &ishole);
                if (islog || ishole)
                        continue;
                vname = zpool_vdev_name(g_zfs, zhp, child[c], B_TRUE);
                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 ||
            strcmp(type, VDEV_TYPE_HOLE) == 0)
                return;

        verify(nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_VDEV_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], B_TRUE);
                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], B_FALSE);
                        (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], B_FALSE);
                        (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], B_TRUE);
                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;
        char *comment;

        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_VDEV_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;

        case ZPOOL_STATUS_RESILVERING:
                (void) printf(gettext(" status: One or more devices were being "
                    "resilvered.\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"));
                }
        }

        /* Print the comment attached to the pool. */
        if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0)
                (void) printf(gettext("comment: %s\n"), comment);

        /*
         * 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://zfsonlinux.org/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,
    nvlist_t *props, int flags)
{
        zpool_handle_t *zhp;
        char *name;
        uint64_t state;
        uint64_t version;

        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 &&
            !(flags & ZFS_IMPORT_ANY_HOST)) {
                uint64_t hostid;

                if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_HOSTID,
                    &hostid) == 0) {
                        unsigned long system_hostid = gethostid() & 0xffffffff;

                        if ((unsigned long)hostid != system_hostid) {
                                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, flags) != 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 &&
            !(flags & ZFS_IMPORT_ONLY) &&
            zpool_enable_datasets(zhp, mntopts, 0) != 0) {
                zpool_close(zhp);
                return (1);
        }

        zpool_close(zhp);
        return (0);
}

/*
 * 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] [-n] [-F] <pool | id> [newpool]
 *
 *       -c     Read pool information from a cachefile instead of searching
 *              devices.
 *
 *       -d     Scan in a specific directory, other than /dev/.  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.
 *
 *       -V     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.
 *
 *       -f     Force import, even if it appears that the pool is active.
 *
 *       -F     Attempt rewind if necessary.
 *
 *       -n     See if rewind would work, but don't actually rewind.
 *
 *       -N     Import the pool but don't mount datasets.
 *
 *       -T     Specify a starting txg to use for import. This option is
 *              intentionally undocumented option for testing purposes.
 *
 *       -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;
        char *env, *envdup = NULL;
        int nsearch = 0;
        int c;
        int err = 0;
        nvlist_t *pools = NULL;
        boolean_t do_all = B_FALSE;
        boolean_t do_destroyed = B_FALSE;
        char *mntopts = NULL;
        nvpair_t *elem;
        nvlist_t *config;
        uint64_t searchguid = 0;
        char *searchname = NULL;
        char *propval;
        nvlist_t *found_config;
        nvlist_t *policy = NULL;
        nvlist_t *props = NULL;
        boolean_t first;
        int flags = ZFS_IMPORT_NORMAL;
        uint32_t rewind_policy = ZPOOL_NO_REWIND;
        boolean_t dryrun = B_FALSE;
        boolean_t do_rewind = B_FALSE;
        boolean_t xtreme_rewind = B_FALSE;
        uint64_t pool_state, txg = -1ULL;
        char *cachefile = NULL;
        importargs_t idata = { 0 };
        char *endptr;

        /* check options */
        while ((c = getopt(argc, argv, ":aCc:d:DEfFmnNo:rR:T:VX")) != -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':
                        flags |= ZFS_IMPORT_ANY_HOST;
                        break;
                case 'F':
                        do_rewind = B_TRUE;
                        break;
                case 'm':
                        flags |= ZFS_IMPORT_MISSING_LOG;
                        break;
                case 'n':
                        dryrun = B_TRUE;
                        break;
                case 'N':
                        flags |= ZFS_IMPORT_ONLY;
                        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 'T':
                        errno = 0;
                        txg = strtoull(optarg, &endptr, 10);
                        if (errno != 0 || *endptr != '\0') {
                                (void) fprintf(stderr,
                                    gettext("invalid txg value\n"));
                                usage(B_FALSE);
                        }
                        rewind_policy = ZPOOL_DO_REWIND | ZPOOL_EXTREME_REWIND;
                        break;
                case 'V':
                        flags |= ZFS_IMPORT_VERBATIM;
                        break;
                case 'X':
                        xtreme_rewind = B_TRUE;
                        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 ((dryrun || xtreme_rewind) && !do_rewind) {
                (void) fprintf(stderr,
                    gettext("-n or -X only meaningful with -F\n"));
                usage(B_FALSE);
        }
        if (dryrun)
                rewind_policy = ZPOOL_TRY_REWIND;
        else if (do_rewind)
                rewind_policy = ZPOOL_DO_REWIND;
        if (xtreme_rewind)
                rewind_policy |= ZPOOL_EXTREME_REWIND;

        /* In the future, we can capture further policy and include it here */
        if (nvlist_alloc(&policy, NV_UNIQUE_NAME, 0) != 0 ||
            nvlist_add_uint64(policy, ZPOOL_REWIND_REQUEST_TXG, txg) != 0 ||
            nvlist_add_uint32(policy, ZPOOL_REWIND_REQUEST, rewind_policy) != 0)
                goto error;

        /* 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"));
                        if (searchdirs != NULL)
                                free(searchdirs);

                        nvlist_free(policy);
                        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;

                /*
                 * User specified a name or guid.  Ensure it's unique.
                 */
                idata.unique = B_TRUE;
        }

        /*
         * Check the environment for the preferred search path.
         */
        if ((searchdirs == NULL) && (env = getenv("ZPOOL_IMPORT_PATH"))) {
                char *dir;

                envdup = strdup(env);

                dir = strtok(envdup, ":");
                while (dir != NULL) {
                        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++] = dir;
                        dir = strtok(NULL, ":");
                }
        }

        idata.path = searchdirs;
        idata.paths = nsearch;
        idata.poolname = searchname;
        idata.guid = searchguid;
        idata.cachefile = cachefile;

        pools = zpool_search_import(g_zfs, &idata);

        if (pools != NULL && idata.exists &&
            (argc == 1 || strcmp(argv[0], argv[1]) == 0)) {
                (void) fprintf(stderr, gettext("cannot import '%s': "
                    "a pool with that name already exists\n"),
                    argv[0]);
                (void) fprintf(stderr, gettext("use the form '%s "
                    "<pool | id> <newpool>' to give it a new name\n"),
                    "zpool import");
                err = 1;
        } else if (pools == NULL && idata.exists) {
                (void) fprintf(stderr, gettext("cannot import '%s': "
                    "a pool with that name is already created/imported,\n"),
                    argv[0]);
                (void) fprintf(stderr, gettext("and no additional pools "
                    "with that name were found\n"));
                err = 1;
        } else if (pools == NULL) {
                if (argc != 0) {
                        (void) fprintf(stderr, gettext("cannot import '%s': "
                            "no such pool available\n"), argv[0]);
                }
                err = 1;
        }

        if (err == 1) {
                if (searchdirs != NULL)
                        free(searchdirs);
                if (envdup != NULL)
                        free(envdup);
                nvlist_free(policy);
                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;

                verify(nvlist_add_nvlist(config, ZPOOL_REWIND_POLICY,
                    policy) == 0);

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

                        if (do_all) {
                                err |= do_import(config, NULL, mntopts,
                                    props, flags);
                        } 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, props, flags);
                }
        }

        /*
         * 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);
        nvlist_free(policy);
        if (searchdirs != NULL)
                free(searchdirs);
        if (envdup != NULL)
                free(envdup);

        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  alloc   free   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_VDEV_STATS, (uint64_t **)&oldvs, &c) == 0);
        } else {
                oldvs = &zerovs;
        }

        verify(nvlist_lookup_uint64_array(newnv, ZPOOL_CONFIG_VDEV_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++) {
                uint64_t ishole = B_FALSE, islog = B_FALSE;

                (void) nvlist_lookup_uint64(newchild[c], ZPOOL_CONFIG_IS_HOLE,
                    &ishole);

                (void) nvlist_lookup_uint64(newchild[c], ZPOOL_CONFIG_IS_LOG,
                    &islog);

                if (ishole || islog)
                        continue;

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

        /*
         * Log device section
         */

        if (num_logs(newnv) > 0) {
                (void) printf("%-*s      -      -      -      -      -      "
                    "-\n", cb->cb_namewidth, "logs");

                for (c = 0; c < children; c++) {
                        uint64_t islog = B_FALSE;
                        (void) nvlist_lookup_uint64(newchild[c],
                            ZPOOL_CONFIG_IS_LOG, &islog);

                        if (islog) {
                                vname = zpool_vdev_name(g_zfs, zhp, newchild[c],
                                    B_FALSE);
                                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],
                            B_FALSE);
                        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);
}

static int
get_columns(void)
{
        struct winsize ws;
        int columns = 80;
        int error;

        if (isatty(STDOUT_FILENO)) {
                error = ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws);
                if (error == 0)
                        columns = ws.ws_col;
        } else {
                columns = 999;
        }

        return columns;
}

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

        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,
                            cb->cb_namewidth);
        }

        /*
         * The width must be at least 10, but may be as large as the
         * column width - 42 so that we can still fit in one line.
         */
        columns = get_columns();

        if (cb->cb_namewidth < 10)
                cb->cb_namewidth = 10;
        if (cb->cb_namewidth > columns - 42)
                cb->cb_namewidth = columns - 42;

        return (0);
}

/*
 * Parse the input string, get the 'interval' and 'count' value if there is one.
 */
static void
get_interval_count(int *argcp, char **argv, unsigned long *iv,
    unsigned long *cnt)
{
        unsigned long interval = 0, count = 0;
        int argc = *argcp;

        /*
         * 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 interval.
         */
        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;
                }
        }

        *iv = interval;
        *cnt = count;
        *argcp = argc;
}

static void
get_timestamp_arg(char c)
{
        if (c == 'u')
                timestamp_fmt = UDATE;
        else if (c == 'd')
                timestamp_fmt = DDATE;
        else
                usage(B_FALSE);
}

/*
 * zpool iostat [-v] [-T d|u] [pool] ... [interval [count]]
 *
 *      -v      Display statistics for individual vdevs
 *      -T      Display a timestamp in date(1) or Unix format
 *
 * 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':
                        get_timestamp_arg(*optarg);
                        break;
                case 'v':
                        verbose = B_TRUE;
                        break;
                case '?':
                        (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                            optopt);
                        usage(B_FALSE);
                }
        }

        argc -= optind;
        argv += optind;

        get_interval_count(&argc, argv, &interval, &count);

        /*
         * 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)
                        (void) fprintf(stderr, gettext("no pools available\n"));
                else {
                        /*
                         * 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", (int)pl->pl_width, header);
                else
                        (void) printf("%-*s", (int)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]*] [-T d|u] [pool] ... [interval [count]]
 *
 *      -H      Scripted mode.  Don't display headers, and separate properties
 *              by a single tab.
 *      -o      List of properties to display.  Defaults to
 *              "name,size,allocated,free,capacity,health,altroot"
 *      -T      Display a timestamp in date(1) or Unix format
 *
 * 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,allocated,free,capacity,dedupratio,health,altroot";
        char *props = default_props;
        unsigned long interval = 0, count = 0;

        /* check options */
        while ((c = getopt(argc, argv, ":Ho:T:")) != -1) {
                switch (c) {
                case 'H':
                        cb.cb_scripted = B_TRUE;
                        break;
                case 'o':
                        props = optarg;
                        break;
                case 'T':
                        get_timestamp_arg(*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;

        get_interval_count(&argc, argv, &interval, &count);

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

        cb.cb_first = B_TRUE;

        for (;;) {

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

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

                if (argc == 0 && cb.cb_first)
                        (void) fprintf(stderr, gettext("no pools available\n"));
                else if (argc && cb.cb_first) {
                        /* cannot open the given pool */
                        zprop_free_list(cb.cb_proplist);
                        return (1);
                }

                if (interval == 0)
                        break;

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

                (void) sleep(interval);
        }

        zprop_free_list(cb.cb_proplist);
        return (ret);
}

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, NULL, 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 split [-n] [-o prop=val] ...
 *              [-o mntopt] ...
 *              [-R altroot] <pool> <newpool> [<device> ...]
 *
 *      -n      Do not split the pool, but display the resulting layout if
 *              it were to be split.
 *      -o      Set property=value, or set mount options.
 *      -R      Mount the split-off pool under an alternate root.
 *
 * Splits the named pool and gives it the new pool name.  Devices to be split
 * off may be listed, provided that no more than one device is specified
 * per top-level vdev mirror.  The newly split pool is left in an exported
 * state unless -R is specified.
 *
 * Restrictions: the top-level of the pool pool must only be made up of
 * mirrors; all devices in the pool must be healthy; no device may be
 * undergoing a resilvering operation.
 */
int
zpool_do_split(int argc, char **argv)
{
        char *srcpool, *newpool, *propval;
        char *mntopts = NULL;
        splitflags_t flags;
        int c, ret = 0;
        zpool_handle_t *zhp;
        nvlist_t *config, *props = NULL;

        flags.dryrun = B_FALSE;
        flags.import = B_FALSE;

        /* check options */
        while ((c = getopt(argc, argv, ":R:no:")) != -1) {
                switch (c) {
                case 'R':
                        flags.import = B_TRUE;
                        if (add_prop_list(
                            zpool_prop_to_name(ZPOOL_PROP_ALTROOT), optarg,
                            &props, B_TRUE) != 0) {
                                if (props)
                                        nvlist_free(props);
                                usage(B_FALSE);
                        }
                        break;
                case 'n':
                        flags.dryrun = B_TRUE;
                        break;
                case 'o':
                        if ((propval = strchr(optarg, '=')) != NULL) {
                                *propval = '\0';
                                propval++;
                                if (add_prop_list(optarg, propval,
                                    &props, B_TRUE) != 0) {
                                        if (props)
                                                nvlist_free(props);
                                        usage(B_FALSE);
                                }
                        } else {
                                mntopts = 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);
                        break;
                }
        }

        if (!flags.import && mntopts != NULL) {
                (void) fprintf(stderr, gettext("setting mntopts is only "
                    "valid when importing the pool\n"));
                usage(B_FALSE);
        }

        argc -= optind;
        argv += optind;

        if (argc < 1) {
                (void) fprintf(stderr, gettext("Missing pool name\n"));
                usage(B_FALSE);
        }
        if (argc < 2) {
                (void) fprintf(stderr, gettext("Missing new pool name\n"));
                usage(B_FALSE);
        }

        srcpool = argv[0];
        newpool = argv[1];

        argc -= 2;
        argv += 2;

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

        config = split_mirror_vdev(zhp, newpool, props, flags, argc, argv);
        if (config == NULL) {
                ret = 1;
        } else {
                if (flags.dryrun) {
                        (void) printf(gettext("would create '%s' with the "
                            "following layout:\n\n"), newpool);
                        print_vdev_tree(NULL, newpool, config, 0, B_FALSE);
                }
                nvlist_free(config);
        }

        zpool_close(zhp);

        if (ret != 0 || flags.dryrun || !flags.import)
                return (ret);

        /*
         * The split was successful. Now we need to open the new
         * pool and import it.
         */
        if ((zhp = zpool_open_canfail(g_zfs, newpool)) == NULL)
                return (1);
        if (zpool_get_state(zhp) != POOL_STATE_UNAVAIL &&
            zpool_enable_datasets(zhp, mntopts, 0) != 0) {
                ret = 1;
                (void) fprintf(stderr, gettext("Split was successful, but "
                    "the datasets could not all be mounted\n"));
                (void) fprintf(stderr, gettext("Try doing '%s' with a "
                    "different altroot\n"), "zpool import");
        }
        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 c;
        int ret = 0;
        boolean_t dryrun = B_FALSE;
        boolean_t do_rewind = B_FALSE;
        boolean_t xtreme_rewind = B_FALSE;
        uint32_t rewind_policy = ZPOOL_NO_REWIND;
        nvlist_t *policy = NULL;
        zpool_handle_t *zhp;
        char *pool, *device;

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

        argc -= optind;
        argv += optind;

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

        if (argc > 2) {
                (void) fprintf(stderr, gettext("too many arguments\n"));
                usage(B_FALSE);
        }

        if ((dryrun || xtreme_rewind) && !do_rewind) {
                (void) fprintf(stderr,
                    gettext("-n or -X only meaningful with -F\n"));
                usage(B_FALSE);
        }
        if (dryrun)
                rewind_policy = ZPOOL_TRY_REWIND;
        else if (do_rewind)
                rewind_policy = ZPOOL_DO_REWIND;
        if (xtreme_rewind)
                rewind_policy |= ZPOOL_EXTREME_REWIND;

        /* In future, further rewind policy choices can be passed along here */
        if (nvlist_alloc(&policy, NV_UNIQUE_NAME, 0) != 0 ||
            nvlist_add_uint32(policy, ZPOOL_REWIND_REQUEST, rewind_policy) != 0)
                return (1);

        pool = argv[0];
        device = argc == 2 ? argv[1] : NULL;

        if ((zhp = zpool_open_canfail(g_zfs, pool)) == NULL) {
                nvlist_free(policy);
                return (1);
        }

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

        zpool_close(zhp);

        nvlist_free(policy);

        return (ret);
}

/*
 * zpool reguid <pool>
 */
int
zpool_do_reguid(int argc, char **argv)
{
        int c;
        char *poolname;
        zpool_handle_t *zhp;
        int ret = 0;

        /* check options */
        while ((c = getopt(argc, argv, "")) != -1) {
                switch (c) {
                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 > 1) {
                (void) fprintf(stderr, gettext("too many arguments\n"));
                usage(B_FALSE);
        }

        poolname = argv[0];
        if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
                return (1);

        ret = zpool_reguid(zhp);

        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_scan(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_SCAN_SCRUB;

        /* check options */
        while ((c = getopt(argc, argv, "s")) != -1) {
                switch (c) {
                case 's':
                        cb.cb_type = POOL_SCAN_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;
        boolean_t       cb_dedup_stats;
} status_cbdata_t;

/*
 * Print out detailed scrub status.
 */
void
print_scan_status(pool_scan_stat_t *ps)
{
        time_t start, end;
        uint64_t elapsed, mins_left, hours_left;
        uint64_t pass_exam, examined, total;
        uint_t rate;
        double fraction_done;
        char processed_buf[7], examined_buf[7], total_buf[7], rate_buf[7];

        (void) printf(gettext(" scan: "));

        /* If there's never been a scan, there's not much to say. */
        if (ps == NULL || ps->pss_func == POOL_SCAN_NONE ||
            ps->pss_func >= POOL_SCAN_FUNCS) {
                (void) printf(gettext("none requested\n"));
                return;
        }

        start = ps->pss_start_time;
        end = ps->pss_end_time;
        zfs_nicenum(ps->pss_processed, processed_buf, sizeof (processed_buf));

        assert(ps->pss_func == POOL_SCAN_SCRUB ||
            ps->pss_func == POOL_SCAN_RESILVER);
        /*
         * Scan is finished or canceled.
         */
        if (ps->pss_state == DSS_FINISHED) {
                uint64_t minutes_taken = (end - start) / 60;
                char *fmt = NULL;

                if (ps->pss_func == POOL_SCAN_SCRUB) {
                        fmt = gettext("scrub repaired %s in %lluh%um with "
                            "%llu errors on %s");
                } else if (ps->pss_func == POOL_SCAN_RESILVER) {
                        fmt = gettext("resilvered %s in %lluh%um with "
                            "%llu errors on %s");
                }
                /* LINTED */
                (void) printf(fmt, processed_buf,
                    (u_longlong_t)(minutes_taken / 60),
                    (uint_t)(minutes_taken % 60),
                    (u_longlong_t)ps->pss_errors,
                    ctime((time_t *)&end));
                return;
        } else if (ps->pss_state == DSS_CANCELED) {
                if (ps->pss_func == POOL_SCAN_SCRUB) {
                        (void) printf(gettext("scrub canceled on %s"),
                            ctime(&end));
                } else if (ps->pss_func == POOL_SCAN_RESILVER) {
                        (void) printf(gettext("resilver canceled on %s"),
                            ctime(&end));
                }
                return;
        }

        assert(ps->pss_state == DSS_SCANNING);

        /*
         * Scan is in progress.
         */
        if (ps->pss_func == POOL_SCAN_SCRUB) {
                (void) printf(gettext("scrub in progress since %s"),
                    ctime(&start));
        } else if (ps->pss_func == POOL_SCAN_RESILVER) {
                (void) printf(gettext("resilver in progress since %s"),
                    ctime(&start));
        }

        examined = ps->pss_examined ? ps->pss_examined : 1;
        total = ps->pss_to_examine;
        fraction_done = (double)examined / total;

        /* elapsed time for this pass */
        elapsed = time(NULL) - ps->pss_pass_start;
        elapsed = elapsed ? elapsed : 1;
        pass_exam = ps->pss_pass_exam ? ps->pss_pass_exam : 1;
        rate = pass_exam / elapsed;
        rate = rate ? rate : 1;
        mins_left = ((total - examined) / rate) / 60;
        hours_left = mins_left / 60;

        zfs_nicenum(examined, examined_buf, sizeof (examined_buf));
        zfs_nicenum(total, total_buf, sizeof (total_buf));
        zfs_nicenum(rate, rate_buf, sizeof (rate_buf));

        /*
         * do not print estimated time if hours_left is more than 30 days
         */
        (void) printf(gettext("    %s scanned out of %s at %s/s"),
            examined_buf, total_buf, rate_buf);
        if (hours_left < (30 * 24)) {
                (void) printf(gettext(", %lluh%um to go\n"),
                    (u_longlong_t)hours_left, (uint_t)(mins_left % 60));
        } else {
                (void) printf(gettext(
                    ", (scan is slow, no estimated time)\n"));
        }

        if (ps->pss_func == POOL_SCAN_RESILVER) {
                (void) printf(gettext("    %s resilvered, %.2f%% done\n"),
                    processed_buf, 100 * fraction_done);
        } else if (ps->pss_func == POOL_SCAN_SCRUB) {
                (void) printf(gettext("    %s repaired, %.2f%% done\n"),
                    processed_buf, 100 * fraction_done);
        }
}

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], B_FALSE);
                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], B_FALSE);
                print_status_config(zhp, name, l2cache[i],
                    namewidth, 2, B_FALSE);
                free(name);
        }
}

static void
print_dedup_stats(nvlist_t *config)
{
        ddt_histogram_t *ddh;
        ddt_stat_t *dds;
        ddt_object_t *ddo;
        uint_t c;

        /*
         * If the pool was faulted then we may not have been able to
         * obtain the config. Otherwise, if have anything in the dedup
         * table continue processing the stats.
         */
        if (nvlist_lookup_uint64_array(config, ZPOOL_CONFIG_DDT_OBJ_STATS,
            (uint64_t **)&ddo, &c) != 0 || ddo->ddo_count == 0)
                return;

        (void) printf("\n");
        (void) printf("DDT entries %llu, size %llu on disk, %llu in core\n",
            (u_longlong_t)ddo->ddo_count,
            (u_longlong_t)ddo->ddo_dspace,
            (u_longlong_t)ddo->ddo_mspace);

        verify(nvlist_lookup_uint64_array(config, ZPOOL_CONFIG_DDT_STATS,
            (uint64_t **)&dds, &c) == 0);
        verify(nvlist_lookup_uint64_array(config, ZPOOL_CONFIG_DDT_HISTOGRAM,
            (uint64_t **)&ddh, &c) == 0);
        zpool_dump_ddt(dds, ddh);
}

/*
 * Display a summary of pool status.  Displays a summary such as:
 *
 *        pool: tank
 *      status: DEGRADED
 *      reason: One or more devices ...
 *         see: http://zfsonlinux.org/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_VDEV_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"));
                zpool_explain_recover(zpool_get_handle(zhp),
                    zpool_get_name(zhp), reason, config);
                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"));
                zpool_explain_recover(zpool_get_handle(zhp),
                    zpool_get_name(zhp), reason, config);
                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://zfsonlinux.org/msg/%s\n"),
                    msgid);

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

                (void) nvlist_lookup_uint64_array(nvroot,
                    ZPOOL_CONFIG_SCAN_STATS, (uint64_t **)&ps, &c);
                print_scan_status(ps);

                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);
                }

                if (cbp->cb_dedup_stats)
                        print_dedup_stats(config);
        } else {
                (void) printf(gettext("config: The configuration cannot be "
                    "determined.\n"));
        }

        return (0);
}

/*
 * zpool status [-vx] [-T d|u] [pool] ... [interval [count]]
 *
 *      -v      Display complete error logs
 *      -x      Display only pools with potential problems
 *      -D      Display dedup status (undocumented)
 *      -T      Display a timestamp in date(1) or Unix format
 *
 * Describes the health status of all pools or some subset.
 */
int
zpool_do_status(int argc, char **argv)
{
        int c;
        int ret;
        unsigned long interval = 0, count = 0;
        status_cbdata_t cb = { 0 };

        /* check options */
        while ((c = getopt(argc, argv, "vxDT:")) != -1) {
                switch (c) {
                case 'v':
                        cb.cb_verbose = B_TRUE;
                        break;
                case 'x':
                        cb.cb_explain = B_TRUE;
                        break;
                case 'D':
                        cb.cb_dedup_stats = B_TRUE;
                        break;
                case 'T':
                        get_timestamp_arg(*optarg);
                        break;
                case '?':
                        (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                            optopt);
                        usage(B_FALSE);
                }
        }

        argc -= optind;
        argv += optind;

        get_interval_count(&argc, argv, &interval, &count);

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

        cb.cb_first = B_TRUE;

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

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

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

                if (ret != 0)
                        return (ret);

                if (interval == 0)
                        break;

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

                (void) sleep(interval);
        }

        return (0);
}

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), (u_longlong_t) 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(" 19  Log device removal\n"));
                (void) printf(gettext(" 20  Compression using zle "
                    "(zero-length encoding)\n"));
                (void) printf(gettext(" 21  Deduplication\n"));
                (void) printf(gettext(" 22  Received properties\n"));
                (void) printf(gettext(" 23  Slim ZIL\n"));
                (void) printf(gettext(" 24  System attributes\n"));
                (void) printf(gettext(" 25  Improved scrub stats\n"));
                (void) printf(gettext(" 26  Improved snapshot deletion "
                    "performance\n"));
                (void) printf(gettext(" 27  Improved snapshot creation "
                    "performance\n"));
                (void) printf(gettext(" 28  Multiple vdev replacements\n"));
                (void) printf(gettext("\nFor more information on a particular "
                    "version, including supported releases,\n"));
                (void) printf(gettext("see the ZFS Administration Guide.\n\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;

/*
 * 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:%llu] %s",
                            zfs_history_event_names[ievent], (u_longlong_t)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) fprintf(stderr, gettext("no pools available\n"));
                return (0);
        }

        return (ret);
}

typedef struct ev_opts {
        int verbose;
        int scripted;
        int follow;
        int clear;
} ev_opts_t;

static void
zpool_do_events_short(nvlist_t *nvl)
{
        char ctime_str[26], str[32], *ptr;
        int64_t *tv;
        uint_t n;

        verify(nvlist_lookup_int64_array(nvl, FM_EREPORT_TIME, &tv, &n) == 0);
        memset(str, ' ', 32);
        (void) ctime_r((const time_t *)&tv[0], ctime_str);
        (void) strncpy(str,    ctime_str+4,  6);             /* 'Jun 30'     */
        (void) strncpy(str+7,  ctime_str+20, 4);             /* '1993'       */
        (void) strncpy(str+12, ctime_str+11, 8);             /* '21:49:08'   */
        (void) sprintf(str+20, ".%09lld", (longlong_t)tv[1]);/* '.123456789' */
        (void) printf(gettext("%s "), str);

        verify(nvlist_lookup_string(nvl, FM_CLASS, &ptr) == 0);
        (void) printf(gettext("%s\n"), ptr);
}

static void
zpool_do_events_nvprint(nvlist_t *nvl, int depth)
{
        nvpair_t *nvp;

        for (nvp = nvlist_next_nvpair(nvl, NULL);
            nvp != NULL; nvp = nvlist_next_nvpair(nvl, nvp)) {

                data_type_t type = nvpair_type(nvp);
                const char *name = nvpair_name(nvp);

                boolean_t b;
                uint8_t i8;
                uint16_t i16;
                uint32_t i32;
                uint64_t i64;
                char *str;
                nvlist_t *cnv;

                printf(gettext("%*s%s = "), depth, "", name);

                switch (type) {
                case DATA_TYPE_BOOLEAN:
                        printf(gettext("%s"), "1");
                        break;

                case DATA_TYPE_BOOLEAN_VALUE:
                        (void) nvpair_value_boolean_value(nvp, &b);
                        printf(gettext("%s"), b ? "1" : "0");
                        break;

                case DATA_TYPE_BYTE:
                        (void) nvpair_value_byte(nvp, &i8);
                        printf(gettext("0x%x"), i8);
                        break;

                case DATA_TYPE_INT8:
                        (void) nvpair_value_int8(nvp, (void *)&i8);
                        printf(gettext("0x%x"), i8);
                        break;

                case DATA_TYPE_UINT8:
                        (void) nvpair_value_uint8(nvp, &i8);
                        printf(gettext("0x%x"), i8);
                        break;

                case DATA_TYPE_INT16:
                        (void) nvpair_value_int16(nvp, (void *)&i16);
                        printf(gettext("0x%x"), i16);
                        break;

                case DATA_TYPE_UINT16:
                        (void) nvpair_value_uint16(nvp, &i16);
                        printf(gettext("0x%x"), i16);
                        break;

                case DATA_TYPE_INT32:
                        (void) nvpair_value_int32(nvp, (void *)&i32);
                        printf(gettext("0x%x"), i32);
                        break;

                case DATA_TYPE_UINT32:
                        (void) nvpair_value_uint32(nvp, &i32);
                        printf(gettext("0x%x"), i32);
                        break;

                case DATA_TYPE_INT64:
                        (void) nvpair_value_int64(nvp, (void *)&i64);
                        printf(gettext("0x%llx"), (u_longlong_t)i64);
                        break;

                case DATA_TYPE_UINT64:
                        (void) nvpair_value_uint64(nvp, &i64);
                        printf(gettext("0x%llx"), (u_longlong_t)i64);
                        break;

                case DATA_TYPE_HRTIME:
                        (void) nvpair_value_hrtime(nvp, (void *)&i64);
                        printf(gettext("0x%llx"), (u_longlong_t)i64);
                        break;

                case DATA_TYPE_STRING:
                        (void) nvpair_value_string(nvp, &str);
                        printf(gettext("\"%s\""), str ? str : "<NULL>");
                        break;

                case DATA_TYPE_NVLIST:
                        printf(gettext("(embedded nvlist)\n"));
                        (void) nvpair_value_nvlist(nvp, &cnv);
                        zpool_do_events_nvprint(cnv, depth + 8);
                        printf(gettext("%*s(end %s)"), depth, "", name);
                        break;

                case DATA_TYPE_NVLIST_ARRAY: {
                        nvlist_t **val;
                        uint_t i, nelem;

                        (void) nvpair_value_nvlist_array(nvp, &val, &nelem);
                        printf(gettext("(%d embedded nvlists)\n"), nelem);
                        for (i = 0; i < nelem; i++) {
                                printf(gettext("%*s%s[%d] = %s\n"),
                                       depth, "", name, i, "(embedded nvlist)");
                                zpool_do_events_nvprint(val[i], depth + 8);
                                printf(gettext("%*s(end %s[%i])\n"),
                                       depth, "", name, i);
                        }
                        printf(gettext("%*s(end %s)\n"), depth, "", name);
                        }
                        break;

                case DATA_TYPE_INT8_ARRAY: {
                        int8_t *val;
                        uint_t i, nelem;

                        (void) nvpair_value_int8_array(nvp, &val, &nelem);
                        for (i = 0; i < nelem; i++)
                                printf(gettext("0x%x "), val[i]);

                        break;
                        }

                case DATA_TYPE_UINT8_ARRAY: {
                        uint8_t *val;
                        uint_t i, nelem;

                        (void) nvpair_value_uint8_array(nvp, &val, &nelem);
                        for (i = 0; i < nelem; i++)
                                printf(gettext("0x%x "), val[i]);

                        break;
                        }

                case DATA_TYPE_INT16_ARRAY: {
                        int16_t *val;
                        uint_t i, nelem;

                        (void) nvpair_value_int16_array(nvp, &val, &nelem);
                        for (i = 0; i < nelem; i++)
                                printf(gettext("0x%x "), val[i]);

                        break;
                        }

                case DATA_TYPE_UINT16_ARRAY: {
                        uint16_t *val;
                        uint_t i, nelem;

                        (void) nvpair_value_uint16_array(nvp, &val, &nelem);
                        for (i = 0; i < nelem; i++)
                                printf(gettext("0x%x "), val[i]);

                        break;
                        }

                case DATA_TYPE_INT32_ARRAY: {
                        int32_t *val;
                        uint_t i, nelem;

                        (void) nvpair_value_int32_array(nvp, &val, &nelem);
                        for (i = 0; i < nelem; i++)
                                printf(gettext("0x%x "), val[i]);

                        break;
                        }

                case DATA_TYPE_UINT32_ARRAY: {
                        uint32_t *val;
                        uint_t i, nelem;

                        (void) nvpair_value_uint32_array(nvp, &val, &nelem);
                        for (i = 0; i < nelem; i++)
                                printf(gettext("0x%x "), val[i]);

                        break;
                        }

                case DATA_TYPE_INT64_ARRAY: {
                        int64_t *val;
                        uint_t i, nelem;

                        (void) nvpair_value_int64_array(nvp, &val, &nelem);
                        for (i = 0; i < nelem; i++)
                                printf(gettext("0x%llx "), (u_longlong_t)val[i]);

                        break;
                        }

                case DATA_TYPE_UINT64_ARRAY: {
                        uint64_t *val;
                        uint_t i, nelem;

                        (void) nvpair_value_uint64_array(nvp, &val, &nelem);
                        for (i = 0; i < nelem; i++)
                                printf(gettext("0x%llx "), (u_longlong_t)val[i]);

                        break;
                        }

                case DATA_TYPE_STRING_ARRAY:
                case DATA_TYPE_BOOLEAN_ARRAY:
                case DATA_TYPE_BYTE_ARRAY:
                case DATA_TYPE_DOUBLE:
                case DATA_TYPE_UNKNOWN:
                        printf(gettext("<unknown>"));
                        break;
                }

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

static int
zpool_do_events_next(ev_opts_t *opts)
{
        nvlist_t *nvl;
        int cleanup_fd, ret, dropped;

        cleanup_fd = open(ZFS_DEV, O_RDWR);
        VERIFY(cleanup_fd >= 0);

        if (!opts->scripted)
                (void) printf(gettext("%-30s %s\n"), "TIME", "CLASS");

        while (1) {
                ret = zpool_events_next(g_zfs, &nvl, &dropped,
                    !!opts->follow, cleanup_fd);
                if (ret || nvl == NULL)
                        break;

                if (dropped > 0)
                        (void) printf(gettext("dropped %d events\n"), dropped);

                zpool_do_events_short(nvl);

                if (opts->verbose) {
                        zpool_do_events_nvprint(nvl, 8);
                        printf(gettext("\n"));
                }

                nvlist_free(nvl);
        }

        VERIFY(0 == close(cleanup_fd));

        return (ret);
}

static int
zpool_do_events_clear(ev_opts_t *opts)
{
        int count, ret;

        ret = zpool_events_clear(g_zfs, &count);
        if (!ret)
                (void) printf(gettext("cleared %d events\n"), count);

        return (ret);
}

/*
 * zpool events [-vfc]
 *
 * Displays events logs by ZFS.
 */
int
zpool_do_events(int argc, char **argv)
{
        ev_opts_t opts = { 0 };
        int ret;
        int c;

        /* check options */
        while ((c = getopt(argc, argv, "vHfc")) != -1) {
                switch (c) {
                case 'v':
                        opts.verbose = 1;
                        break;
                case 'H':
                        opts.scripted = 1;
                        break;
                case 'f':
                        opts.follow = 1;
                        break;
                case 'c':
                        opts.clear = 1;
                        break;
                case '?':
                        (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                            optopt);
                        usage(B_FALSE);
                }
        }
        argc -= optind;
        argv += optind;

        if (opts.clear)
                ret = zpool_do_events_clear(&opts);
        else
                ret = zpool_do_events_next(&opts);

        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,
                    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 = 0;
        char *cmdname;

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

        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) ||
             strcmp(cmdname, "--help") == 0)
                usage(B_TRUE);

        if ((g_zfs = libzfs_init()) == NULL)
                return (1);

        libzfs_print_on_error(g_zfs, 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);
                ret = 1;
        }

        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);
}