Prebaked scripts for zpool status/iostat -c

[zfs.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, 2015 by Delphix. All rights reserved.
 * Copyright (c) 2012 by Frederik Wessels. All rights reserved.
 * Copyright (c) 2012 by Cyril Plisko. All rights reserved.
 * Copyright (c) 2013 by Prasad Joshi (sTec). All rights reserved.
 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>.
 */

#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 <pwd.h>
#include <zone.h>
#include <sys/wait.h>
#include <zfs_prop.h>
#include <sys/fs/zfs.h>
#include <sys/stat.h>
#include <sys/fm/fs/zfs.h>
#include <sys/fm/util.h>
#include <sys/fm/protocol.h>
#include <sys/zfs_ioctl.h>

#include <math.h>

#include <libzfs.h>

#include "zpool_util.h"
#include "zfs_comutil.h"
#include "zfeature_common.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_labelclear(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_reopen(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_LABELCLEAR,
        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,
        HELP_REOPEN
} zpool_help_t;


/*
 * Flags for stats to display with "zpool iostats"
 */
enum iostat_type {
        IOS_DEFAULT = 0,
        IOS_LATENCY = 1,
        IOS_QUEUES = 2,
        IOS_L_HISTO = 3,
        IOS_RQ_HISTO = 4,
        IOS_COUNT,      /* always last element */
};

/* iostat_type entries as bitmasks */
#define IOS_DEFAULT_M   (1ULL << IOS_DEFAULT)
#define IOS_LATENCY_M   (1ULL << IOS_LATENCY)
#define IOS_QUEUES_M    (1ULL << IOS_QUEUES)
#define IOS_L_HISTO_M   (1ULL << IOS_L_HISTO)
#define IOS_RQ_HISTO_M  (1ULL << IOS_RQ_HISTO)

/* Mask of all the histo bits */
#define IOS_ANYHISTO_M (IOS_L_HISTO_M | IOS_RQ_HISTO_M)

/*
 * Lookup table for iostat flags to nvlist names.  Basically a list
 * of all the nvlists a flag requires.  Also specifies the order in
 * which data gets printed in zpool iostat.
 */
static const char *vsx_type_to_nvlist[IOS_COUNT][11] = {
        [IOS_L_HISTO] = {
            ZPOOL_CONFIG_VDEV_TOT_R_LAT_HISTO,
            ZPOOL_CONFIG_VDEV_TOT_W_LAT_HISTO,
            ZPOOL_CONFIG_VDEV_DISK_R_LAT_HISTO,
            ZPOOL_CONFIG_VDEV_DISK_W_LAT_HISTO,
            ZPOOL_CONFIG_VDEV_SYNC_R_LAT_HISTO,
            ZPOOL_CONFIG_VDEV_SYNC_W_LAT_HISTO,
            ZPOOL_CONFIG_VDEV_ASYNC_R_LAT_HISTO,
            ZPOOL_CONFIG_VDEV_ASYNC_W_LAT_HISTO,
            ZPOOL_CONFIG_VDEV_SCRUB_LAT_HISTO,
            NULL},
        [IOS_LATENCY] = {
            ZPOOL_CONFIG_VDEV_TOT_R_LAT_HISTO,
            ZPOOL_CONFIG_VDEV_TOT_W_LAT_HISTO,
            ZPOOL_CONFIG_VDEV_DISK_R_LAT_HISTO,
            ZPOOL_CONFIG_VDEV_DISK_W_LAT_HISTO,
            NULL},
        [IOS_QUEUES] = {
            ZPOOL_CONFIG_VDEV_SYNC_R_ACTIVE_QUEUE,
            ZPOOL_CONFIG_VDEV_SYNC_W_ACTIVE_QUEUE,
            ZPOOL_CONFIG_VDEV_ASYNC_R_ACTIVE_QUEUE,
            ZPOOL_CONFIG_VDEV_ASYNC_W_ACTIVE_QUEUE,
            ZPOOL_CONFIG_VDEV_SCRUB_ACTIVE_QUEUE,
            NULL},
        [IOS_RQ_HISTO] = {
            ZPOOL_CONFIG_VDEV_SYNC_IND_R_HISTO,
            ZPOOL_CONFIG_VDEV_SYNC_AGG_R_HISTO,
            ZPOOL_CONFIG_VDEV_SYNC_IND_W_HISTO,
            ZPOOL_CONFIG_VDEV_SYNC_AGG_W_HISTO,
            ZPOOL_CONFIG_VDEV_ASYNC_IND_R_HISTO,
            ZPOOL_CONFIG_VDEV_ASYNC_AGG_R_HISTO,
            ZPOOL_CONFIG_VDEV_ASYNC_IND_W_HISTO,
            ZPOOL_CONFIG_VDEV_ASYNC_AGG_W_HISTO,
            ZPOOL_CONFIG_VDEV_IND_SCRUB_HISTO,
            ZPOOL_CONFIG_VDEV_AGG_SCRUB_HISTO,
            NULL},
};


/*
 * Given a cb->cb_flags with a histogram bit set, return the iostat_type.
 * Right now, only one histo bit is ever set at one time, so we can
 * just do a highbit64(a)
 */
#define IOS_HISTO_IDX(a)        (highbit64(a & IOS_ANYHISTO_M) - 1)

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 },
        { "labelclear", zpool_do_labelclear,    HELP_LABELCLEAR         },
        { 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              },
        { "reopen",     zpool_do_reopen,        HELP_REOPEN             },
        { 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        (ARRAY_SIZE(command_table))

static zpool_command_t *current_command;
static char history_str[HIS_MAX_RECORD_LEN];
static boolean_t log_history = B_TRUE;
static uint_t timestamp_fmt = NODATE;

static const char *
get_usage(zpool_help_t idx)
{
        switch (idx) {
        case HELP_ADD:
                return (gettext("\tadd [-fgLnP] [-o property=value] "
                    "<pool> <vdev> ...\n"));
        case HELP_ATTACH:
                return (gettext("\tattach [-f] [-o property=value] "
                    "<pool> <device> <new-device>\n"));
        case HELP_CLEAR:
                return (gettext("\tclear [-nF] <pool> [device]\n"));
        case HELP_CREATE:
                return (gettext("\tcreate [-fnd] [-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 [-af] <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 [[[-c [script1,script2,...]"
                    "[-lq]]|[-rw]] [-T d | u] [-ghHLpPvy]\n"
                    "\t    [[pool ...]|[pool vdev ...]|[vdev ...]]"
                    " [interval [count]]\n"));
        case HELP_LABELCLEAR:
                return (gettext("\tlabelclear [-f] <vdev>\n"));
        case HELP_LIST:
                return (gettext("\tlist [-gHLpPv] [-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] [-o property=value] "
                    "<pool> <device> [new-device]\n"));
        case HELP_REMOVE:
                return (gettext("\tremove <pool> <device> ...\n"));
        case HELP_REOPEN:
                return (gettext("\treopen <pool>\n"));
        case HELP_SCRUB:
                return (gettext("\tscrub [-s] <pool> ...\n"));
        case HELP_STATUS:
                return (gettext("\tstatus [-c [script1,script2,...]] [-gLPvxD]"
                    "[-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 [-Hp] [-o \"all\" | field[,...]] "
                    "<\"all\" | property[,...]> <pool> ...\n"));
        case HELP_SET:
                return (gettext("\tset <property=value> <pool> \n"));
        case HELP_SPLIT:
                return (gettext("\tsplit [-gLnP] [-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);

                (void) fprintf(fp, "\t%-15s   ", "feature@...");
                (void) fprintf(fp, "YES   disabled | enabled | active\n");

                (void) fprintf(fp, gettext("\nThe feature@ properties must be "
                    "appended with a feature name.\nSee zpool-features(5).\n"));
        }

        /*
         * 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, int name_flags)
{
        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], name_flags);
                print_vdev_tree(zhp, vname, child[c], indent + 2,
                    B_FALSE, name_flags);
                free(vname);
        }
}

static boolean_t
prop_list_contains_feature(nvlist_t *proplist)
{
        nvpair_t *nvp;
        for (nvp = nvlist_next_nvpair(proplist, NULL); NULL != nvp;
            nvp = nvlist_next_nvpair(proplist, nvp)) {
                if (zpool_prop_feature(nvpair_name(nvp)))
                        return (B_TRUE);
        }
        return (B_FALSE);
}

/*
 * 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) {
                const char *vname = zpool_prop_to_name(ZPOOL_PROP_VERSION);

                if ((prop = zpool_name_to_prop(propname)) == ZPROP_INVAL &&
                    !zpool_prop_feature(propname)) {
                        (void) fprintf(stderr, gettext("property '%s' is "
                            "not a valid pool property\n"), propname);
                        return (2);
                }

                /*
                 * feature@ properties and version should not be specified
                 * at the same time.
                 */
                if ((prop == ZPROP_INVAL && zpool_prop_feature(propname) &&
                    nvlist_exists(proplist, vname)) ||
                    (prop == ZPOOL_PROP_VERSION &&
                    prop_list_contains_feature(proplist))) {
                        (void) fprintf(stderr, gettext("'feature@' and "
                            "'version' properties cannot be specified "
                            "together\n"));
                        return (2);
                }


                if (zpool_prop_feature(propname))
                        normnm = propname;
                else
                        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);
}

/*
 * Set a default property pair (name, string-value) in a property nvlist
 */
static int
add_prop_list_default(const char *propname, char *propval, nvlist_t **props,
    boolean_t poolprop)
{
        char *pval;

        if (nvlist_lookup_string(*props, propname, &pval) == 0)
                return (0);

        return (add_prop_list(propname, propval, props, B_TRUE));
}

/*
 * zpool add [-fgLnP] [-o property=value] <pool> <vdev> ...
 *
 *      -f      Force addition of devices, even if they appear in use
 *      -g      Display guid for individual vdev name.
 *      -L      Follow links when resolving vdev path name.
 *      -n      Do not add the devices, but display the resulting layout if
 *              they were to be added.
 *      -o      Set property=value.
 *      -P      Display full path for vdev name.
 *
 * 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 name_flags = 0;
        int c;
        nvlist_t *nvroot;
        char *poolname;
        int ret;
        zpool_handle_t *zhp;
        nvlist_t *config;
        nvlist_t *props = NULL;
        char *propval;

        /* check options */
        while ((c = getopt(argc, argv, "fgLno:P")) != -1) {
                switch (c) {
                case 'f':
                        force = B_TRUE;
                        break;
                case 'g':
                        name_flags |= VDEV_NAME_GUID;
                        break;
                case 'L':
                        name_flags |= VDEV_NAME_FOLLOW_LINKS;
                        break;
                case 'n':
                        dryrun = B_TRUE;
                        break;
                case 'o':
                        if ((propval = strchr(optarg, '=')) == NULL) {
                                (void) fprintf(stderr, gettext("missing "
                                    "'=' for -o option\n"));
                                usage(B_FALSE);
                        }
                        *propval = '\0';
                        propval++;

                        if ((strcmp(optarg, ZPOOL_CONFIG_ASHIFT) != 0) ||
                            (add_prop_list(optarg, propval, &props, B_TRUE)))
                                usage(B_FALSE);
                        break;
                case 'P':
                        name_flags |= VDEV_NAME_PATH;
                        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, props, force, !force, B_FALSE, dryrun,
            argc, argv);
        if (nvroot == NULL) {
                zpool_close(zhp);
                return (1);
        }

        if (dryrun) {
                nvlist_t *poolnvroot;
                nvlist_t **l2child;
                uint_t l2children, c;
                char *vname;
                boolean_t hadcache = B_FALSE;

                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,
                    name_flags);
                print_vdev_tree(zhp, NULL, nvroot, 0, B_FALSE, name_flags);

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

                /* Do the same for the caches */
                if (nvlist_lookup_nvlist_array(poolnvroot, ZPOOL_CONFIG_L2CACHE,
                    &l2child, &l2children) == 0 && l2children) {
                        hadcache = B_TRUE;
                        (void) printf(gettext("\tcache\n"));
                        for (c = 0; c < l2children; c++) {
                                vname = zpool_vdev_name(g_zfs, NULL,
                                    l2child[c], name_flags);
                                (void) printf("\t  %s\n", vname);
                                free(vname);
                        }
                }
                if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
                    &l2child, &l2children) == 0 && l2children) {
                        if (!hadcache)
                                (void) printf(gettext("\tcache\n"));
                        for (c = 0; c < l2children; c++) {
                                vname = zpool_vdev_name(g_zfs, NULL,
                                    l2child[c], name_flags);
                                (void) printf("\t  %s\n", vname);
                                free(vname);
                        }
                }

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

        nvlist_free(props);
        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 = NULL;

        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;
        }
        zpool_close(zhp);

        return (ret);
}

/*
 * zpool labelclear [-f] <vdev>
 *
 *      -f      Force clearing the label for the vdevs which are members of
 *              the exported or foreign pools.
 *
 * Verifies that the vdev is not active and zeros out the label information
 * on the device.
 */
int
zpool_do_labelclear(int argc, char **argv)
{
        char vdev[MAXPATHLEN];
        char *name = NULL;
        struct stat st;
        int c, fd = -1, ret = 0;
        nvlist_t *config;
        pool_state_t state;
        boolean_t inuse = B_FALSE;
        boolean_t force = B_FALSE;

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

        argc -= optind;
        argv += optind;

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

        /*
         * Check if we were given absolute path and use it as is.
         * Otherwise if the provided vdev name doesn't point to a file,
         * try prepending expected disk paths and partition numbers.
         */
        (void) strlcpy(vdev, argv[0], sizeof (vdev));
        if (vdev[0] != '/' && stat(vdev, &st) != 0) {
                int error;

                error = zfs_resolve_shortname(argv[0], vdev, MAXPATHLEN);
                if (error == 0 && zfs_dev_is_whole_disk(vdev)) {
                        if (zfs_append_partition(vdev, MAXPATHLEN) == -1)
                                error = ENOENT;
                }

                if (error || (stat(vdev, &st) != 0)) {
                        (void) fprintf(stderr, gettext(
                            "failed to find device %s, try specifying absolute "
                            "path instead\n"), argv[0]);
                        return (1);
                }
        }

        if ((fd = open(vdev, O_RDWR)) < 0) {
                (void) fprintf(stderr, gettext("failed to open %s: %s\n"),
                    vdev, strerror(errno));
                return (1);
        }

        if (ioctl(fd, BLKFLSBUF) != 0)
                (void) fprintf(stderr, gettext("failed to invalidate "
                    "cache for %s: %s\n"), vdev, strerror(errno));

        if (zpool_read_label(fd, &config, NULL) != 0 || config == NULL) {
                (void) fprintf(stderr,
                    gettext("failed to check state for %s\n"), vdev);
                return (1);
        }
        nvlist_free(config);

        ret = zpool_in_use(g_zfs, fd, &state, &name, &inuse);
        if (ret != 0) {
                (void) fprintf(stderr,
                    gettext("failed to check state for %s\n"), vdev);
                return (1);
        }

        if (!inuse)
                goto wipe_label;

        switch (state) {
        default:
        case POOL_STATE_ACTIVE:
        case POOL_STATE_SPARE:
        case POOL_STATE_L2CACHE:
                (void) fprintf(stderr, gettext(
                    "%s is a member (%s) of pool \"%s\"\n"),
                    vdev, zpool_pool_state_to_name(state), name);
                ret = 1;
                goto errout;

        case POOL_STATE_EXPORTED:
                if (force)
                        break;
                (void) fprintf(stderr, gettext(
                    "use '-f' to override the following error:\n"
                    "%s is a member of exported pool \"%s\"\n"),
                    vdev, name);
                ret = 1;
                goto errout;

        case POOL_STATE_POTENTIALLY_ACTIVE:
                if (force)
                        break;
                (void) fprintf(stderr, gettext(
                    "use '-f' to override the following error:\n"
                    "%s is a member of potentially active pool \"%s\"\n"),
                    vdev, name);
                ret = 1;
                goto errout;

        case POOL_STATE_DESTROYED:
                /* inuse should never be set for a destroyed pool */
                assert(0);
                break;
        }

wipe_label:
        ret = zpool_clear_label(fd);
        if (ret != 0) {
                (void) fprintf(stderr,
                    gettext("failed to clear label for %s\n"), vdev);
        }

errout:
        free(name);
        (void) close(fd);

        return (ret);
}

/*
 * zpool create [-fnd] [-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 feature@feature=enabled|disabled.
 *      -d      Don't automatically enable all supported pool features
 *              (individual features can be enabled with -o).
 *      -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;
        boolean_t enable_all_pool_feat = B_TRUE;
        int c;
        nvlist_t *nvroot = NULL;
        char *poolname;
        char *tname = NULL;
        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, ":fndR:m:o:O:t:")) != -1) {
                switch (c) {
                case 'f':
                        force = B_TRUE;
                        break;
                case 'n':
                        dryrun = B_TRUE;
                        break;
                case 'd':
                        enable_all_pool_feat = B_FALSE;
                        break;
                case 'R':
                        altroot = optarg;
                        if (add_prop_list(zpool_prop_to_name(
                            ZPOOL_PROP_ALTROOT), optarg, &props, B_TRUE))
                                goto errout;
                        if (add_prop_list_default(zpool_prop_to_name(
                            ZPOOL_PROP_CACHEFILE), "none", &props, B_TRUE))
                                goto errout;
                        break;
                case 'm':
                        /* Equivalent to -O mountpoint=optarg */
                        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;

                        /*
                         * If the user is creating a pool that doesn't support
                         * feature flags, don't enable any features.
                         */
                        if (zpool_name_to_prop(optarg) == ZPOOL_PROP_VERSION) {
                                char *end;
                                u_longlong_t ver;

                                ver = strtoull(propval, &end, 10);
                                if (*end == '\0' &&
                                    ver < SPA_VERSION_FEATURES) {
                                        enable_all_pool_feat = B_FALSE;
                                }
                        }
                        if (zpool_name_to_prop(optarg) == ZPOOL_PROP_ALTROOT)
                                altroot = propval;
                        break;
                case 'O':
                        if ((propval = strchr(optarg, '=')) == NULL) {
                                (void) fprintf(stderr, gettext("missing "
                                    "'=' for -O option\n"));
                                goto errout;
                        }
                        *propval = '\0';
                        propval++;

                        /*
                         * Mountpoints are checked and then added later.
                         * Uniquely among properties, they can be specified
                         * more than once, to avoid conflict with -m.
                         */
                        if (0 == strcmp(optarg,
                            zfs_prop_to_name(ZFS_PROP_MOUNTPOINT))) {
                                mountpoint = propval;
                        } else if (add_prop_list(optarg, propval, &fsprops,
                            B_FALSE)) {
                                goto errout;
                        }
                        break;
                case 't':
                        /*
                         * Sanity check temporary pool name.
                         */
                        if (strchr(optarg, '/') != NULL) {
                                (void) fprintf(stderr, gettext("cannot create "
                                    "'%s': invalid character '/' in temporary "
                                    "name\n"), optarg);
                                (void) fprintf(stderr, gettext("use 'zfs "
                                    "create' to create a dataset\n"));
                                goto errout;
                        }

                        if (add_prop_list(zpool_prop_to_name(
                            ZPOOL_PROP_TNAME), optarg, &props, B_TRUE))
                                goto errout;
                        if (add_prop_list_default(zpool_prop_to_name(
                            ZPOOL_PROP_CACHEFILE), "none", &props, B_TRUE))
                                goto errout;
                        tname = optarg;
                        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;
                        }
                }
        }

        /*
         * Now that the mountpoint's validity has been checked, ensure that
         * the property is set appropriately prior to creating the pool.
         */
        if (mountpoint != NULL) {
                ret = add_prop_list(zfs_prop_to_name(ZFS_PROP_MOUNTPOINT),
                    mountpoint, &fsprops, B_FALSE);
                if (ret != 0)
                        goto errout;
        }

        ret = 1;
        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, 0);
                if (num_logs(nvroot) > 0)
                        print_vdev_tree(NULL, "logs", nvroot, 0, B_TRUE, 0);

                ret = 0;
        } else {
                /*
                 * Hand off to libzfs.
                 */
                spa_feature_t i;
                for (i = 0; i < SPA_FEATURES; i++) {
                        char propname[MAXPATHLEN];
                        char *propval;
                        zfeature_info_t *feat = &spa_feature_table[i];

                        (void) snprintf(propname, sizeof (propname),
                            "feature@%s", feat->fi_uname);

                        /*
                         * Only features contained in props will be enabled:
                         * remove from the nvlist every ZFS_FEATURE_DISABLED
                         * value and add every missing ZFS_FEATURE_ENABLED if
                         * enable_all_pool_feat is set.
                         */
                        if (!nvlist_lookup_string(props, propname, &propval)) {
                                if (strcmp(propval, ZFS_FEATURE_DISABLED) == 0)
                                        (void) nvlist_remove_all(props,
                                            propname);
                        } else if (enable_all_pool_feat) {
                                ret = add_prop_list(propname,
                                    ZFS_FEATURE_ENABLED, &props, B_TRUE);
                                if (ret != 0)
                                        goto errout;
                        }
                }

                ret = 1;
                if (zpool_create(g_zfs, poolname,
                    nvroot, props, fsprops) == 0) {
                        zfs_handle_t *pool = zfs_open(g_zfs,
                            tname ? tname : poolname, ZFS_TYPE_FILESYSTEM);
                        if (pool != NULL) {
                                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));
                zpool_close(zhp);
                return (1);
        }

        /* The history must be logged as part of the export */
        log_history = B_FALSE;

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

        zpool_close(zhp);

        return (ret);
}

typedef struct export_cbdata {
        boolean_t force;
        boolean_t hardforce;
} export_cbdata_t;

/*
 * Export one pool
 */
int
zpool_export_one(zpool_handle_t *zhp, void *data)
{
        export_cbdata_t *cb = data;

        if (zpool_disable_datasets(zhp, cb->force) != 0)
                return (1);

        /* The history must be logged as part of the export */
        log_history = B_FALSE;

        if (cb->hardforce) {
                if (zpool_export_force(zhp, history_str) != 0)
                        return (1);
        } else if (zpool_export(zhp, cb->force, history_str) != 0) {
                return (1);
        }

        return (0);
}

/*
 * zpool export [-f] <pool> ...
 *
 *      -a      Export all pools
 *      -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)
{
        export_cbdata_t cb;
        boolean_t do_all = B_FALSE;
        boolean_t force = B_FALSE;
        boolean_t hardforce = B_FALSE;
        int c, ret;

        /* check options */
        while ((c = getopt(argc, argv, "afF")) != -1) {
                switch (c) {
                case 'a':
                        do_all = B_TRUE;
                        break;
                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);
                }
        }

        cb.force = force;
        cb.hardforce = hardforce;
        argc -= optind;
        argv += optind;

        if (do_all) {
                if (argc != 0) {
                        (void) fprintf(stderr, gettext("too many arguments\n"));
                        usage(B_FALSE);
                }

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

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

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

        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,
    int name_flags)
{
        char *name;
        nvlist_t **child;
        uint_t c, children;
        int ret;

        name = zpool_vdev_name(g_zfs, zhp, nv, name_flags);
        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, name_flags)) > 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, name_flags)) > 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, name_flags)) > 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);
}

typedef struct status_cbdata {
        int             cb_count;
        int             cb_name_flags;
        int             cb_namewidth;
        boolean_t       cb_allpools;
        boolean_t       cb_verbose;
        boolean_t       cb_explain;
        boolean_t       cb_first;
        boolean_t       cb_dedup_stats;
        boolean_t       cb_print_status;
        vdev_cmd_data_list_t    *vcdl;
} status_cbdata_t;

/* Return 1 if string is NULL, empty, or whitespace; return 0 otherwise. */
static int
is_blank_str(char *str)
{
        while (str != NULL && *str != '\0') {
                if (!isblank(*str))
                        return (0);
                str++;
        }
        return (1);
}

/* Print command output lines for specific vdev in a specific pool */
static void
zpool_print_cmd(vdev_cmd_data_list_t *vcdl, const char *pool, char *path)
{
        vdev_cmd_data_t *data;
        int i, j;
        char *val;

        for (i = 0; i < vcdl->count; i++) {
                if ((strcmp(vcdl->data[i].path, path) != 0) ||
                    (strcmp(vcdl->data[i].pool, pool) != 0)) {
                        /* Not the vdev we're looking for */
                        continue;
                }

                data = &vcdl->data[i];
                /* Print out all the output values for this vdev */
                for (j = 0; j < vcdl->uniq_cols_cnt; j++) {
                        val = NULL;
                        /* Does this vdev have values for this column? */
                        for (int k = 0; k < data->cols_cnt; k++) {
                                if (strcmp(data->cols[k],
                                    vcdl->uniq_cols[j]) == 0) {
                                        /* yes it does, record the value */
                                        val = data->lines[k];
                                        break;
                                }
                        }
                        /*
                         * Mark empty values with dashes to make output
                         * awk-able.
                         */
                        if (is_blank_str(val))
                                val = "-";

                        printf("%*s", vcdl->uniq_cols_width[j], val);
                        if (j < vcdl->uniq_cols_cnt - 1)
                                printf("  ");
                }

                /* Print out any values that aren't in a column at the end */
                for (j = data->cols_cnt; j < data->lines_cnt; j++) {
                        /* Did we have any columns?  If so print a spacer. */
                        if (vcdl->uniq_cols_cnt > 0)
                                printf("  ");

                        val = data->lines[j];
                        printf("%s", val ? val : "");
                }
                break;
        }
}

/*
 * Print out configuration state as requested by status_callback.
 */
static void
print_status_config(zpool_handle_t *zhp, status_cbdata_t *cb, const char *name,
    nvlist_t *nv, 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 spare_cb;
        char *state;
        char *path = NULL;

        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, "", cb->cb_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) {
                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_UNSUP_FEAT:
                        (void) printf(gettext("unsupported feature(s)"));
                        break;

                case VDEV_AUX_SPARED:
                        verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID,
                            &spare_cb.cb_guid) == 0);
                        if (zpool_iter(g_zfs, find_spare, &spare_cb) == 1) {
                                if (strcmp(zpool_get_name(spare_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(spare_cb.cb_zhp));
                                zpool_close(spare_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");
        }

        if (cb->vcdl != NULL) {
                if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0) {
                        printf("  ");
                        zpool_print_cmd(cb->vcdl, zpool_get_name(zhp), path);
                }
        }

        (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],
                    cb->cb_name_flags | VDEV_NAME_TYPE_ID);
                print_status_config(zhp, cb, vname, child[c], 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.
 */
static void
print_import_config(status_cbdata_t *cb, const char *name, nvlist_t *nv,
    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, "", cb->cb_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_UNSUP_FEAT:
                        (void) printf(gettext("unsupported feature(s)"));
                        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],
                    cb->cb_name_flags | VDEV_NAME_TYPE_ID);
                print_import_config(cb, vname, child[c], 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],
                            cb->cb_name_flags);
                        (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],
                            cb->cb_name_flags);
                        (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, status_cbdata_t *cb, nvlist_t *nv)
{
        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],
                    cb->cb_name_flags | VDEV_NAME_TYPE_ID);
                if (cb->cb_print_status)
                        print_status_config(zhp, cb, name, child[c], 2,
                            B_FALSE);
                else
                        print_import_config(cb, name, child[c], 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;
        zpool_status_t reason;
        zpool_errata_t errata;
        const char *health;
        uint_t vsc;
        char *comment;
        status_cbdata_t cb = { 0 };

        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, &errata);

        (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 a "
                    "legacy 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_FEAT_DISABLED:
                (void) printf(gettext(" status: Some supported features are "
                    "not enabled on the pool.\n"));
                break;

        case ZPOOL_STATUS_UNSUP_FEAT_READ:
                (void) printf(gettext("status: The pool uses the following "
                    "feature(s) not supported on this system:\n"));
                zpool_print_unsup_feat(config);
                break;

        case ZPOOL_STATUS_UNSUP_FEAT_WRITE:
                (void) printf(gettext("status: The pool can only be accessed "
                    "in read-only mode on this system. It\n\tcannot be "
                    "accessed in read-write mode because it uses the "
                    "following\n\tfeature(s) not supported on this system:\n"));
                zpool_print_unsup_feat(config);
                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;

        case ZPOOL_STATUS_ERRATA:
                (void) printf(gettext(" status: Errata #%d detected.\n"),
                    errata);
                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 ||
                    reason == ZPOOL_STATUS_FEAT_DISABLED) {
                        (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 if (reason == ZPOOL_STATUS_ERRATA) {
                        switch (errata) {
                        case ZPOOL_ERRATA_NONE:
                                break;

                        case ZPOOL_ERRATA_ZOL_2094_SCRUB:
                                (void) printf(gettext(" action: The pool can "
                                    "be imported using its name or numeric "
                                    "identifier,\n\thowever there is a compat"
                                    "ibility issue which should be corrected"
                                    "\n\tby running 'zpool scrub'\n"));
                                break;

                        case ZPOOL_ERRATA_ZOL_2094_ASYNC_DESTROY:
                                (void) printf(gettext(" action: The pool can"
                                    "not be imported with this version of ZFS "
                                    "due to\n\tan active asynchronous destroy. "
                                    "Revert to an earlier version\n\tand "
                                    "allow the destroy to complete before "
                                    "updating.\n"));
                                break;

                        default:
                                /*
                                 * All errata must contain an action message.
                                 */
                                assert(0);
                        }
                } 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_UNSUP_FEAT_READ:
                        (void) printf(gettext("action: The pool cannot be "
                            "imported. Access the pool on a system that "
                            "supports\n\tthe required feature(s), or recreate "
                            "the pool from backup.\n"));
                        break;
                case ZPOOL_STATUS_UNSUP_FEAT_WRITE:
                        (void) printf(gettext("action: The pool cannot be "
                            "imported in read-write mode. Import the pool "
                            "with\n"
                            "\t\"-o readonly=on\", access the pool on a system "
                            "that supports the\n\trequired feature(s), 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"));

        cb.cb_namewidth = max_width(NULL, nvroot, 0, 0, VDEV_NAME_TYPE_ID);
        if (cb.cb_namewidth < 10)
                cb.cb_namewidth = 10;

        print_import_config(&cb, name, nvroot, 0);
        if (num_logs(nvroot) > 0)
                print_logs(NULL, &cb, nvroot);

        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 (!SPA_VERSION_IS_SUPPORTED(version)) {
                (void) fprintf(stderr, gettext("cannot import '%s': pool "
                    "is formatted using an unsupported ZFS version\n"), name);
                return (1);
        } else if (state != POOL_STATE_EXPORTED &&
            !(flags & ZFS_IMPORT_ANY_HOST)) {
                uint64_t hostid = 0;
                unsigned long system_hostid = get_system_hostid();

                (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_HOSTID,
                    &hostid);

                if (hostid != 0 && (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);
                }
        }

        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 '=').
 *
 *       -s     Scan using the default search path, the libblkid cache will
 *              not be consulted.
 *
 * 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;
        boolean_t do_scan = 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:R:stT: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 (add_prop_list_default(zpool_prop_to_name(
                            ZPOOL_PROP_CACHEFILE), "none", &props, B_TRUE))
                                goto error;
                        break;
                case 's':
                        do_scan = B_TRUE;
                        break;
                case 't':
                        flags |= ZFS_IMPORT_TEMP_NAME;
                        if (add_prop_list_default(zpool_prop_to_name(
                            ZPOOL_PROP_CACHEFILE), "none", &props, B_TRUE))
                                goto error;
                        break;

                case 'T':
                        errno = 0;
                        txg = strtoull(optarg, &endptr, 0);
                        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 effective uid.  We do this explicitly here because
         * otherwise any attempt to discover pools will silently fail.
         */
        if (argc == 0 && geteuid() != 0) {
                (void) fprintf(stderr, gettext("cannot "
                    "discover pools: permission denied\n"));
                if (searchdirs != NULL)
                        free(searchdirs);

                nvlist_free(props);
                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];
                        searchguid = 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;
        idata.scan = do_scan;

        /*
         * Under Linux the zpool_find_import_impl() function leverages the
         * taskq implementation to parallelize device scanning.  It is
         * therefore necessary to initialize this functionality for the
         * duration of the zpool_search_import() function.
         */
        thread_init();
        pools = zpool_search_import(g_zfs, &idata);
        thread_fini();

        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);
                nvlist_free(pools);
                nvlist_free(props);
                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 {
        uint64_t cb_flags;
        int cb_name_flags;
        int cb_namewidth;
        int cb_iteration;
        char **cb_vdev_names; /* Only show these vdevs */
        unsigned int cb_vdev_names_count;
        boolean_t cb_verbose;
        boolean_t cb_literal;
        boolean_t cb_scripted;
        zpool_list_t *cb_list;
        vdev_cmd_data_list_t *vcdl;
} iostat_cbdata_t;

/*  iostat labels */
typedef struct name_and_columns {
        const char *name;       /* Column name */
        unsigned int columns;   /* Center name to this number of columns */
} name_and_columns_t;

#define IOSTAT_MAX_LABELS       11      /* Max number of labels on one line */

static const name_and_columns_t iostat_top_labels[][IOSTAT_MAX_LABELS] =
{
        [IOS_DEFAULT] = {{"capacity", 2}, {"operations", 2}, {"bandwidth", 2},
            {NULL}},
        [IOS_LATENCY] = {{"total_wait", 2}, {"disk_wait", 2}, {"syncq_wait", 2},
            {"asyncq_wait", 2}, {"scrub"}},
        [IOS_QUEUES] = {{"syncq_read", 2}, {"syncq_write", 2},
            {"asyncq_read", 2}, {"asyncq_write", 2}, {"scrubq_read", 2},
            {NULL}},
        [IOS_L_HISTO] = {{"total_wait", 2}, {"disk_wait", 2},
            {"sync_queue", 2}, {"async_queue", 2}, {NULL}},
        [IOS_RQ_HISTO] = {{"sync_read", 2}, {"sync_write", 2},
            {"async_read", 2}, {"async_write", 2}, {"scrub", 2}, {NULL}},

};

/* Shorthand - if "columns" field not set, default to 1 column */
static const name_and_columns_t iostat_bottom_labels[][IOSTAT_MAX_LABELS] =
{
        [IOS_DEFAULT] = {{"alloc"}, {"free"}, {"read"}, {"write"}, {"read"},
            {"write"}, {NULL}},
        [IOS_LATENCY] = {{"read"}, {"write"}, {"read"}, {"write"}, {"read"},
            {"write"}, {"read"}, {"write"}, {"wait"}, {NULL}},
        [IOS_QUEUES] = {{"pend"}, {"activ"}, {"pend"}, {"activ"}, {"pend"},
            {"activ"}, {"pend"}, {"activ"}, {"pend"}, {"activ"}, {NULL}},
        [IOS_L_HISTO] = {{"read"}, {"write"}, {"read"}, {"write"}, {"read"},
            {"write"}, {"read"}, {"write"}, {"scrub"}, {NULL}},
        [IOS_RQ_HISTO] = {{"ind"}, {"agg"}, {"ind"}, {"agg"}, {"ind"}, {"agg"},
            {"ind"}, {"agg"}, {"ind"}, {"agg"}, {NULL}},
};

static const char *histo_to_title[] = {
        [IOS_L_HISTO] = "latency",
        [IOS_RQ_HISTO] = "req_size",
};

/*
 * Return the number of labels in a null-terminated name_and_columns_t
 * array.
 *
 */
static unsigned int
label_array_len(const name_and_columns_t *labels)
{
        int i = 0;

        while (labels[i].name)
                i++;

        return (i);
}

/*
 * Return the number of strings in a null-terminated string array.
 * For example:
 *
 *     const char foo[] = {"bar", "baz", NULL}
 *
 * returns 2
 */
static uint64_t
str_array_len(const char *array[])
{
        uint64_t i = 0;
        while (array[i])
                i++;

        return (i);
}


/*
 * Return a default column width for default/latency/queue columns. This does
 * not include histograms, which have their columns autosized.
 */
static unsigned int
default_column_width(iostat_cbdata_t *cb, enum iostat_type type)
{
        unsigned long column_width = 5; /* Normal niceprint */
        static unsigned long widths[] = {
                /*
                 * Choose some sane default column sizes for printing the
                 * raw numbers.
                 */
                [IOS_DEFAULT] = 15, /* 1PB capacity */
                [IOS_LATENCY] = 10, /* 1B ns = 10sec */
                [IOS_QUEUES] = 6,   /* 1M queue entries */
        };

        if (cb->cb_literal)
                column_width = widths[type];

        return (column_width);
}

/*
 * Print the column labels, i.e:
 *
 *   capacity     operations     bandwidth
 * alloc   free   read  write   read  write  ...
 *
 * If force_column_width is set, use it for the column width.  If not set, use
 * the default column width.
 */
void
print_iostat_labels(iostat_cbdata_t *cb, unsigned int force_column_width,
    const name_and_columns_t labels[][IOSTAT_MAX_LABELS])
{
        int i, idx, s;
        unsigned int text_start, rw_column_width, spaces_to_end;
        uint64_t flags = cb->cb_flags;
        uint64_t f;
        unsigned int column_width = force_column_width;

        /* For each bit set in flags */
        for (f = flags; f; f &= ~(1ULL << idx)) {
                idx = lowbit64(f) - 1;
                if (!force_column_width)
                        column_width = default_column_width(cb, idx);
                /* Print our top labels centered over "read  write" label. */
                for (i = 0; i < label_array_len(labels[idx]); i++) {
                        const char *name = labels[idx][i].name;
                        /*
                         * We treat labels[][].columns == 0 as shorthand
                         * for one column.  It makes writing out the label
                         * tables more concise.
                         */
                        unsigned int columns = MAX(1, labels[idx][i].columns);
                        unsigned int slen = strlen(name);

                        rw_column_width = (column_width * columns) +
                            (2 * (columns - 1));

                        text_start = (int)((rw_column_width)/columns -
                            slen/columns);

                        printf("  ");   /* Two spaces between columns */

                        /* Space from beginning of column to label */
                        for (s = 0; s < text_start; s++)
                                printf(" ");

                        printf("%s", name);

                        /* Print space after label to end of column */
                        spaces_to_end = rw_column_width - text_start - slen;
                        for (s = 0; s < spaces_to_end; s++)
                                printf(" ");

                }
        }
}


/*
 * print_cmd_columns - Print custom column titles from -c
 *
 * If the user specified the "zpool status|iostat -c" then print their custom
 * column titles in the header.  For example, print_cmd_columns() would print
 * the "  col1  col2" part of this:
 *
 * $ zpool iostat -vc 'echo col1=val1; echo col2=val2'
 * ...
 *            capacity     operations     bandwidth
 * pool        alloc   free   read  write   read  write  col1  col2
 * ----------  -----  -----  -----  -----  -----  -----  ----  ----
 * mypool       269K  1008M      0      0    107    946
 *   mirror     269K  1008M      0      0    107    946
 *     sdb         -      -      0      0    102    473  val1  val2
 *     sdc         -      -      0      0      5    473  val1  val2
 * ----------  -----  -----  -----  -----  -----  -----  ----  ----
 */
void
print_cmd_columns(vdev_cmd_data_list_t *vcdl, int use_dashes)
{
        int i, j;
        vdev_cmd_data_t *data = &vcdl->data[0];

        if (vcdl->count == 0 || data == NULL)
                return;

        /*
         * Each vdev cmd should have the same column names unless the user did
         * something weird with their cmd.  Just take the column names from the
         * first vdev and assume it works for all of them.
         */
        for (i = 0; i < vcdl->uniq_cols_cnt; i++) {
                printf("  ");
                if (use_dashes) {
                        for (j = 0; j < vcdl->uniq_cols_width[i]; j++)
                                printf("-");
                } else {
                        printf("%*s", vcdl->uniq_cols_width[i],
                            vcdl->uniq_cols[i]);
                }
        }
}


/*
 * Utility function to print out a line of dashes like:
 *
 *      --------------------------------  -----  -----  -----  -----  -----
 *
 * ...or a dashed named-row line like:
 *
 *      logs                                  -      -      -      -      -
 *
 * @cb:                         iostat data
 *
 * @force_column_width          If non-zero, use the value as the column width.
 *                              Otherwise use the default column widths.
 *
 * @name:                       Print a dashed named-row line starting
 *                              with @name.  Otherwise, print a regular
 *                              dashed line.
 */
static void
print_iostat_dashes(iostat_cbdata_t *cb, unsigned int force_column_width,
    const char *name)
{
        int i;
        unsigned int namewidth;
        uint64_t flags = cb->cb_flags;
        uint64_t f;
        int idx;
        const name_and_columns_t *labels;
        const char *title;


        if (cb->cb_flags & IOS_ANYHISTO_M) {
                title = histo_to_title[IOS_HISTO_IDX(cb->cb_flags)];
        } else if (cb->cb_vdev_names_count) {
                title = "vdev";
        } else  {
                title = "pool";
        }

        namewidth = MAX(MAX(strlen(title), cb->cb_namewidth),
            name ? strlen(name) : 0);


        if (name) {
                printf("%-*s", namewidth, name);
        } else {
                for (i = 0; i < namewidth; i++)
                        (void) printf("-");
        }

        /* For each bit in flags */
        for (f = flags; f; f &= ~(1ULL << idx)) {
                unsigned int column_width;
                idx = lowbit64(f) - 1;
                if (force_column_width)
                        column_width = force_column_width;
                else
                        column_width = default_column_width(cb, idx);

                labels = iostat_bottom_labels[idx];
                for (i = 0; i < label_array_len(labels); i++) {
                        if (name)
                                printf("  %*s-", column_width - 1, " ");
                        else
                                printf("  %.*s", column_width,
                                    "--------------------");
                }
        }
}


static void
print_iostat_separator_impl(iostat_cbdata_t *cb,
    unsigned int force_column_width)
{
        print_iostat_dashes(cb, force_column_width, NULL);
}

static void
print_iostat_separator(iostat_cbdata_t *cb)
{
        print_iostat_separator_impl(cb, 0);
}

static void
print_iostat_header_impl(iostat_cbdata_t *cb, unsigned int force_column_width,
    const char *histo_vdev_name)
{
        unsigned int namewidth;
        const char *title;

        if (cb->cb_flags & IOS_ANYHISTO_M) {
                title = histo_to_title[IOS_HISTO_IDX(cb->cb_flags)];
        } else if (cb->cb_vdev_names_count) {
                title = "vdev";
        } else  {
                title = "pool";
        }

        namewidth = MAX(MAX(strlen(title), cb->cb_namewidth),
            histo_vdev_name ? strlen(histo_vdev_name) : 0);

        if (histo_vdev_name)
                printf("%-*s", namewidth, histo_vdev_name);
        else
                printf("%*s", namewidth, "");


        print_iostat_labels(cb, force_column_width, iostat_top_labels);
        printf("\n");

        printf("%-*s", namewidth, title);

        print_iostat_labels(cb, force_column_width, iostat_bottom_labels);
        if (cb->vcdl != NULL)
                print_cmd_columns(cb->vcdl, 0);

        printf("\n");

        print_iostat_separator_impl(cb, force_column_width);

        if (cb->vcdl != NULL)
                print_cmd_columns(cb->vcdl, 1);

        printf("\n");
}

static void
print_iostat_header(iostat_cbdata_t *cb)
{
        print_iostat_header_impl(cb, 0, NULL);
}


/*
 * Display a single statistic.
 */
static void
print_one_stat(uint64_t value, enum zfs_nicenum_format format,
    unsigned int column_size, boolean_t scripted)
{
        char buf[64];

        zfs_nicenum_format(value, buf, sizeof (buf), format);

        if (scripted)
                printf("\t%s", buf);
        else
                printf("  %*s", column_size, buf);
}

/*
 * Calculate the default vdev stats
 *
 * Subtract oldvs from newvs, apply a scaling factor, and save the resulting
 * stats into calcvs.
 */
static void
calc_default_iostats(vdev_stat_t *oldvs, vdev_stat_t *newvs,
    vdev_stat_t *calcvs)
{
        int i;

        memcpy(calcvs, newvs, sizeof (*calcvs));
        for (i = 0; i < ARRAY_SIZE(calcvs->vs_ops); i++)
                calcvs->vs_ops[i] = (newvs->vs_ops[i] - oldvs->vs_ops[i]);

        for (i = 0; i < ARRAY_SIZE(calcvs->vs_bytes); i++)
                calcvs->vs_bytes[i] = (newvs->vs_bytes[i] - oldvs->vs_bytes[i]);
}

/*
 * Internal representation of the extended iostats data.
 *
 * The extended iostat stats are exported in nvlists as either uint64_t arrays
 * or single uint64_t's.  We make both look like arrays to make them easier
 * to process.  In order to make single uint64_t's look like arrays, we set
 * __data to the stat data, and then set *data = &__data with count = 1.  Then,
 * we can just use *data and count.
 */
struct stat_array {
        uint64_t *data;
        uint_t count;   /* Number of entries in data[] */
        uint64_t __data; /* Only used when data is a single uint64_t */
};

static uint64_t
stat_histo_max(struct stat_array *nva, unsigned int len)
{
        uint64_t max = 0;
        int i;
        for (i = 0; i < len; i++)
                max = MAX(max, array64_max(nva[i].data, nva[i].count));

        return (max);
}

/*
 * Helper function to lookup a uint64_t array or uint64_t value and store its
 * data as a stat_array.  If the nvpair is a single uint64_t value, then we make
 * it look like a one element array to make it easier to process.
 */
static int
nvpair64_to_stat_array(nvlist_t *nvl, const char *name,
    struct stat_array *nva)
{
        nvpair_t *tmp;
        int ret;

        verify(nvlist_lookup_nvpair(nvl, name, &tmp) == 0);
        switch (nvpair_type(tmp)) {
        case DATA_TYPE_UINT64_ARRAY:
                ret = nvpair_value_uint64_array(tmp, &nva->data, &nva->count);
                break;
        case DATA_TYPE_UINT64:
                ret = nvpair_value_uint64(tmp, &nva->__data);
                nva->data = &nva->__data;
                nva->count = 1;
                break;
        default:
                /* Not a uint64_t */
                ret = EINVAL;
                break;
        }

        return (ret);
}

/*
 * Given a list of nvlist names, look up the extended stats in newnv and oldnv,
 * subtract them, and return the results in a newly allocated stat_array.
 * You must free the returned array after you are done with it with
 * free_calc_stats().
 *
 * Additionally, you can set "oldnv" to NULL if you simply want the newnv
 * values.
 */
static struct stat_array *
calc_and_alloc_stats_ex(const char **names, unsigned int len, nvlist_t *oldnv,
    nvlist_t *newnv)
{
        nvlist_t *oldnvx = NULL, *newnvx;
        struct stat_array *oldnva, *newnva, *calcnva;
        int i, j;
        unsigned int alloc_size = (sizeof (struct stat_array)) * len;

        /* Extract our extended stats nvlist from the main list */
        verify(nvlist_lookup_nvlist(newnv, ZPOOL_CONFIG_VDEV_STATS_EX,
            &newnvx) == 0);
        if (oldnv) {
                verify(nvlist_lookup_nvlist(oldnv, ZPOOL_CONFIG_VDEV_STATS_EX,
                    &oldnvx) == 0);
        }

        newnva = safe_malloc(alloc_size);
        oldnva = safe_malloc(alloc_size);
        calcnva = safe_malloc(alloc_size);

        for (j = 0; j < len; j++) {
                verify(nvpair64_to_stat_array(newnvx, names[j],
                    &newnva[j]) == 0);
                calcnva[j].count = newnva[j].count;
                alloc_size = calcnva[j].count * sizeof (calcnva[j].data[0]);
                calcnva[j].data = safe_malloc(alloc_size);
                memcpy(calcnva[j].data, newnva[j].data, alloc_size);

                if (oldnvx) {
                        verify(nvpair64_to_stat_array(oldnvx, names[j],
                            &oldnva[j]) == 0);
                        for (i = 0; i < oldnva[j].count; i++)
                                calcnva[j].data[i] -= oldnva[j].data[i];
                }
        }
        free(newnva);
        free(oldnva);
        return (calcnva);
}

static void
free_calc_stats(struct stat_array *nva, unsigned int len)
{
        int i;
        for (i = 0; i < len; i++)
                free(nva[i].data);

        free(nva);
}

static void
print_iostat_histo(struct stat_array *nva, unsigned int len,
    iostat_cbdata_t *cb, unsigned int column_width, unsigned int namewidth,
    double scale)
{
        int i, j;
        char buf[6];
        uint64_t val;
        enum zfs_nicenum_format format;
        unsigned int buckets;
        unsigned int start_bucket;

        if (cb->cb_literal)
                format = ZFS_NICENUM_RAW;
        else
                format = ZFS_NICENUM_1024;

        /* All these histos are the same size, so just use nva[0].count */
        buckets = nva[0].count;

        if (cb->cb_flags & IOS_RQ_HISTO_M) {
                /* Start at 512 - req size should never be lower than this */
                start_bucket = 9;
        } else {
                start_bucket = 0;
        }

        for (j = start_bucket; j < buckets; j++) {
                /* Print histogram bucket label */
                if (cb->cb_flags & IOS_L_HISTO_M) {
                        /* Ending range of this bucket */
                        val = (1UL << (j + 1)) - 1;
                        zfs_nicetime(val, buf, sizeof (buf));
                } else {
                        /* Request size (starting range of bucket) */
                        val = (1UL << j);
                        zfs_nicenum(val, buf, sizeof (buf));
                }

                if (cb->cb_scripted)
                        printf("%llu", (u_longlong_t)val);
                else
                        printf("%-*s", namewidth, buf);

                /* Print the values on the line */
                for (i = 0; i < len; i++) {
                        print_one_stat(nva[i].data[j] * scale, format,
                            column_width, cb->cb_scripted);
                }
                printf("\n");
        }
}

static void
print_solid_separator(unsigned int length)
{
        while (length--)
                printf("-");
        printf("\n");
}

static void
print_iostat_histos(iostat_cbdata_t *cb, nvlist_t *oldnv,
    nvlist_t *newnv, double scale, const char *name)
{
        unsigned int column_width;
        unsigned int namewidth;
        unsigned int entire_width;
        enum iostat_type type;
        struct stat_array *nva;
        const char **names;
        unsigned int names_len;

        /* What type of histo are we? */
        type = IOS_HISTO_IDX(cb->cb_flags);

        /* Get NULL-terminated array of nvlist names for our histo */
        names = vsx_type_to_nvlist[type];
        names_len = str_array_len(names); /* num of names */

        nva = calc_and_alloc_stats_ex(names, names_len, oldnv, newnv);

        if (cb->cb_literal) {
                column_width = MAX(5,
                    (unsigned int) log10(stat_histo_max(nva, names_len)) + 1);
        } else {
                column_width = 5;
        }

        namewidth = MAX(cb->cb_namewidth,
            strlen(histo_to_title[IOS_HISTO_IDX(cb->cb_flags)]));

        /*
         * Calculate the entire line width of what we're printing.  The
         * +2 is for the two spaces between columns:
         */
        /*       read  write                            */
        /*      -----  -----                            */
        /*      |___|  <---------- column_width         */
        /*                                              */
        /*      |__________|  <--- entire_width         */
        /*                                              */
        entire_width = namewidth + (column_width + 2) *
            label_array_len(iostat_bottom_labels[type]);

        if (cb->cb_scripted)
                printf("%s\n", name);
        else
                print_iostat_header_impl(cb, column_width, name);

        print_iostat_histo(nva, names_len, cb, column_width,
            namewidth, scale);

        free_calc_stats(nva, names_len);
        if (!cb->cb_scripted)
                print_solid_separator(entire_width);
}

/*
 * Calculate the average latency of a power-of-two latency histogram
 */
static uint64_t
single_histo_average(uint64_t *histo, unsigned int buckets)
{
        int i;
        uint64_t count = 0, total = 0;

        for (i = 0; i < buckets; i++) {
                /*
                 * Our buckets are power-of-two latency ranges.  Use the
                 * midpoint latency of each bucket to calculate the average.
                 * For example:
                 *
                 * Bucket          Midpoint
                 * 8ns-15ns:       12ns
                 * 16ns-31ns:      24ns
                 * ...
                 */
                if (histo[i] != 0) {
                        total += histo[i] * (((1UL << i) + ((1UL << i)/2)));
                        count += histo[i];
                }
        }

        /* Prevent divide by zero */
        return (count == 0 ? 0 : total / count);
}

static void
print_iostat_queues(iostat_cbdata_t *cb, nvlist_t *oldnv,
    nvlist_t *newnv, double scale)
{
        int i;
        uint64_t val;
        const char *names[] = {
                ZPOOL_CONFIG_VDEV_SYNC_R_PEND_QUEUE,
                ZPOOL_CONFIG_VDEV_SYNC_R_ACTIVE_QUEUE,
                ZPOOL_CONFIG_VDEV_SYNC_W_PEND_QUEUE,
                ZPOOL_CONFIG_VDEV_SYNC_W_ACTIVE_QUEUE,
                ZPOOL_CONFIG_VDEV_ASYNC_R_PEND_QUEUE,
                ZPOOL_CONFIG_VDEV_ASYNC_R_ACTIVE_QUEUE,
                ZPOOL_CONFIG_VDEV_ASYNC_W_PEND_QUEUE,
                ZPOOL_CONFIG_VDEV_ASYNC_W_ACTIVE_QUEUE,
                ZPOOL_CONFIG_VDEV_SCRUB_PEND_QUEUE,
                ZPOOL_CONFIG_VDEV_SCRUB_ACTIVE_QUEUE,
        };

        struct stat_array *nva;

        unsigned int column_width = default_column_width(cb, IOS_QUEUES);
        enum zfs_nicenum_format format;

        nva = calc_and_alloc_stats_ex(names, ARRAY_SIZE(names), NULL, newnv);

        if (cb->cb_literal)
                format = ZFS_NICENUM_RAW;
        else
                format = ZFS_NICENUM_1024;

        for (i = 0; i < ARRAY_SIZE(names); i++) {
                val = nva[i].data[0] * scale;
                print_one_stat(val, format, column_width, cb->cb_scripted);
        }

        free_calc_stats(nva, ARRAY_SIZE(names));
}

static void
print_iostat_latency(iostat_cbdata_t *cb, nvlist_t *oldnv,
    nvlist_t *newnv, double scale)
{
        int i;
        uint64_t val;
        const char *names[] = {
                ZPOOL_CONFIG_VDEV_TOT_R_LAT_HISTO,
                ZPOOL_CONFIG_VDEV_TOT_W_LAT_HISTO,
                ZPOOL_CONFIG_VDEV_DISK_R_LAT_HISTO,
                ZPOOL_CONFIG_VDEV_DISK_W_LAT_HISTO,
                ZPOOL_CONFIG_VDEV_SYNC_R_LAT_HISTO,
                ZPOOL_CONFIG_VDEV_SYNC_W_LAT_HISTO,
                ZPOOL_CONFIG_VDEV_ASYNC_R_LAT_HISTO,
                ZPOOL_CONFIG_VDEV_ASYNC_W_LAT_HISTO,
                ZPOOL_CONFIG_VDEV_SCRUB_LAT_HISTO,
        };
        struct stat_array *nva;

        unsigned int column_width = default_column_width(cb, IOS_LATENCY);
        enum zfs_nicenum_format format;

        nva = calc_and_alloc_stats_ex(names, ARRAY_SIZE(names), oldnv, newnv);

        if (cb->cb_literal)
                format = ZFS_NICENUM_RAW;
        else
                format = ZFS_NICENUM_TIME;

        /* Print our avg latencies on the line */
        for (i = 0; i < ARRAY_SIZE(names); i++) {
                /* Compute average latency for a latency histo */
                val = single_histo_average(nva[i].data, nva[i].count) * scale;
                print_one_stat(val, format, column_width, cb->cb_scripted);
        }
        free_calc_stats(nva, ARRAY_SIZE(names));
}

/*
 * Print default statistics (capacity/operations/bandwidth)
 */
static void
print_iostat_default(vdev_stat_t *vs, iostat_cbdata_t *cb, double scale)
{
        unsigned int column_width = default_column_width(cb, IOS_DEFAULT);
        enum zfs_nicenum_format format;
        char na;        /* char to print for "not applicable" values */

        if (cb->cb_literal) {
                format = ZFS_NICENUM_RAW;
                na = '0';
        } else {
                format = ZFS_NICENUM_1024;
                na = '-';
        }

        /* only toplevel vdevs have capacity stats */
        if (vs->vs_space == 0) {
                if (cb->cb_scripted)
                        printf("\t%c\t%c", na, na);
                else
                        printf("  %*c  %*c", column_width, na, column_width,
                            na);
        } else {
                print_one_stat(vs->vs_alloc, format, column_width,
                    cb->cb_scripted);
                print_one_stat(vs->vs_space - vs->vs_alloc, format,
                    column_width, cb->cb_scripted);
        }

        print_one_stat((uint64_t)(vs->vs_ops[ZIO_TYPE_READ] * scale),
            format, column_width, cb->cb_scripted);
        print_one_stat((uint64_t)(vs->vs_ops[ZIO_TYPE_WRITE] * scale),
            format, column_width, cb->cb_scripted);
        print_one_stat((uint64_t)(vs->vs_bytes[ZIO_TYPE_READ] * scale),
            format, column_width, cb->cb_scripted);
        print_one_stat((uint64_t)(vs->vs_bytes[ZIO_TYPE_WRITE] * scale),
            format, column_width, cb->cb_scripted);
}

/*
 * 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.
 *
 * Returns the number of stat lines printed.
 */
unsigned int
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, *calcvs;
        vdev_stat_t zerovs = { 0 };
        char *vname;
        int i;
        int ret = 0;
        uint64_t tdelta;
        double scale;

        calcvs = safe_malloc(sizeof (*calcvs));

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

        /* Do we only want to see a specific vdev? */
        for (i = 0; i < cb->cb_vdev_names_count; i++) {
                /* Yes we do.  Is this the vdev? */
                if (strcmp(name, cb->cb_vdev_names[i]) == 0) {
                        /*
                         * This is our vdev.  Since it is the only vdev we
                         * will be displaying, make depth = 0 so that it
                         * doesn't get indented.
                         */
                        depth = 0;
                        break;
                }
        }

        if (cb->cb_vdev_names_count && (i == cb->cb_vdev_names_count)) {
                /* Couldn't match the name */
                goto children;
        }


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

        /*
         * Print the vdev name unless it's is a histogram.  Histograms
         * display the vdev name in the header itself.
         */
        if (!(cb->cb_flags & IOS_ANYHISTO_M)) {
                if (cb->cb_scripted) {
                        printf("%s", name);
                } else {
                        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), "");
                }
        }

        /* Calculate our scaling factor */
        tdelta = newvs->vs_timestamp - oldvs->vs_timestamp;
        if ((oldvs->vs_timestamp == 0) && (cb->cb_flags & IOS_ANYHISTO_M)) {
                /*
                 * If we specify printing histograms with no time interval, then
                 * print the histogram numbers over the entire lifetime of the
                 * vdev.
                 */
                scale = 1;
        } else {
                if (tdelta == 0)
                        scale = 1.0;
                else
                        scale = (double)NANOSEC / tdelta;
        }

        if (cb->cb_flags & IOS_DEFAULT_M) {
                calc_default_iostats(oldvs, newvs, calcvs);
                print_iostat_default(calcvs, cb, scale);
        }
        if (cb->cb_flags & IOS_LATENCY_M)
                print_iostat_latency(cb, oldnv, newnv, scale);
        if (cb->cb_flags & IOS_QUEUES_M)
                print_iostat_queues(cb, oldnv, newnv, scale);
        if (cb->cb_flags & IOS_ANYHISTO_M) {
                printf("\n");
                print_iostat_histos(cb, oldnv, newnv, scale, name);
        }

        if (cb->vcdl != NULL) {
                char *path;
                if (nvlist_lookup_string(newnv, ZPOOL_CONFIG_PATH,
                    &path) == 0) {
                        printf("  ");
                        zpool_print_cmd(cb->vcdl, zpool_get_name(zhp), path);
                }
        }

        if (!(cb->cb_flags & IOS_ANYHISTO_M))
                printf("\n");

        ret++;

children:

        free(calcvs);

        if (!cb->cb_verbose)
                return (ret);

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

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

        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],
                    cb->cb_name_flags);
                ret += print_vdev_stats(zhp, vname, oldnv ? oldchild[c] : NULL,
                    newchild[c], cb, depth + 2);
                free(vname);
        }

        /*
         * Log device section
         */

        if (num_logs(newnv) > 0) {
                if ((!(cb->cb_flags & IOS_ANYHISTO_M)) && !cb->cb_scripted &&
                    !cb->cb_vdev_names) {
                        print_iostat_dashes(cb, 0, "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],
                                    cb->cb_name_flags);
                                ret += 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 (ret);

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

        if (children > 0) {
                if ((!(cb->cb_flags & IOS_ANYHISTO_M)) && !cb->cb_scripted &&
                    !cb->cb_vdev_names) {
                        print_iostat_dashes(cb, 0, "cache");
                }

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

        return (ret);
}

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;
        int ret;

        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);

        ret = print_vdev_stats(zhp, zpool_get_name(zhp), oldnvroot, newnvroot,
            cb, 0);
        if ((ret != 0) && !(cb->cb_flags & IOS_ANYHISTO_M) &&
            !cb->cb_scripted && cb->cb_verbose && !cb->cb_vdev_names_count) {
                print_iostat_separator(cb);
                if (cb->vcdl != NULL) {
                        print_cmd_columns(cb->vcdl, 1);
                }
                printf("\n");
        }

        return (ret);
}

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);
                unsigned int poolname_len = strlen(zpool_get_name(zhp));
                if (!cb->cb_verbose)
                        cb->cb_namewidth = poolname_len;
                else
                        cb->cb_namewidth = MAX(poolname_len,
                            max_width(zhp, nvroot, 0, cb->cb_namewidth,
                            cb->cb_name_flags));
        }
        /*
         * 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, float *iv,
    unsigned long *cnt)
{
        float interval = 0;
        unsigned long count = 0;
        int argc = *argcp;

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

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

                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 && isnumber(argv[argc - 1])) {
                char *end;

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

                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);
}

/*
 * Return stat flags that are supported by all pools by both the module and
 * zpool iostat.  "*data" should be initialized to all 0xFFs before running.
 * It will get ANDed down until only the flags that are supported on all pools
 * remain.
 */
static int
get_stat_flags_cb(zpool_handle_t *zhp, void *data)
{
        uint64_t *mask = data;
        nvlist_t *config, *nvroot, *nvx;
        uint64_t flags = 0;
        int i, j;

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

        /* Default stats are always supported, but for completeness.. */
        if (nvlist_exists(nvroot, ZPOOL_CONFIG_VDEV_STATS))
                flags |= IOS_DEFAULT_M;

        /* Get our extended stats nvlist from the main list */
        if (nvlist_lookup_nvlist(nvroot, ZPOOL_CONFIG_VDEV_STATS_EX,
            &nvx) != 0) {
                /*
                 * No extended stats; they're probably running an older
                 * module.  No big deal, we support that too.
                 */
                goto end;
        }

        /* For each extended stat, make sure all its nvpairs are supported */
        for (j = 0; j < ARRAY_SIZE(vsx_type_to_nvlist); j++) {
                if (!vsx_type_to_nvlist[j][0])
                        continue;

                /* Start off by assuming the flag is supported, then check */
                flags |= (1ULL << j);
                for (i = 0; vsx_type_to_nvlist[j][i]; i++) {
                        if (!nvlist_exists(nvx, vsx_type_to_nvlist[j][i])) {
                                /* flag isn't supported */
                                flags = flags & ~(1ULL  << j);
                                break;
                        }
                }
        }
end:
        *mask = *mask & flags;
        return (0);
}

/*
 * Return a bitmask of stats that are supported on all pools by both the module
 * and zpool iostat.
 */
static uint64_t
get_stat_flags(zpool_list_t *list)
{
        uint64_t mask = -1;

        /*
         * get_stat_flags_cb() will lop off bits from "mask" until only the
         * flags that are supported on all pools remain.
         */
        pool_list_iter(list, B_FALSE, get_stat_flags_cb, &mask);
        return (mask);
}

/*
 * Return 1 if cb_data->cb_vdev_names[0] is this vdev's name, 0 otherwise.
 */
static int
is_vdev_cb(zpool_handle_t *zhp, nvlist_t *nv, void *cb_data)
{
        iostat_cbdata_t *cb = cb_data;
        char *name = NULL;
        int ret = 0;

        name = zpool_vdev_name(g_zfs, zhp, nv, cb->cb_name_flags);

        if (strcmp(name, cb->cb_vdev_names[0]) == 0)
                ret = 1; /* match */
        free(name);

        return (ret);
}

/*
 * Returns 1 if cb_data->cb_vdev_names[0] is a vdev name, 0 otherwise.
 */
static int
is_vdev(zpool_handle_t *zhp, void *cb_data)
{
        return (for_each_vdev(zhp, is_vdev_cb, cb_data));
}

/*
 * Check if vdevs are in a pool
 *
 * Return 1 if all argv[] strings are vdev names in pool "pool_name". Otherwise
 * return 0.  If pool_name is NULL, then search all pools.
 */
static int
are_vdevs_in_pool(int argc, char **argv, char *pool_name,
    iostat_cbdata_t *cb)
{
        char **tmp_name;
        int ret = 0;
        int i;
        int pool_count = 0;

        if ((argc == 0) || !*argv)
                return (0);

        if (pool_name)
                pool_count = 1;

        /* Temporarily hijack cb_vdev_names for a second... */
        tmp_name = cb->cb_vdev_names;

        /* Go though our list of prospective vdev names */
        for (i = 0; i < argc; i++) {
                cb->cb_vdev_names = argv + i;

                /* Is this name a vdev in our pools? */
                ret = for_each_pool(pool_count, &pool_name, B_TRUE, NULL,
                    is_vdev, cb);
                if (!ret) {
                        /* No match */
                        break;
                }
        }

        cb->cb_vdev_names = tmp_name;

        return (ret);
}

static int
is_pool_cb(zpool_handle_t *zhp, void *data)
{
        char *name = data;
        if (strcmp(name, zpool_get_name(zhp)) == 0)
                return (1);

        return (0);
}

/*
 * Do we have a pool named *name?  If so, return 1, otherwise 0.
 */
static int
is_pool(char *name)
{
        return (for_each_pool(0, NULL, B_TRUE, NULL,  is_pool_cb, name));
}

/* Are all our argv[] strings pool names?  If so return 1, 0 otherwise. */
static int
are_all_pools(int argc, char **argv)
{
        if ((argc == 0) || !*argv)
                return (0);

        while (--argc >= 0)
                if (!is_pool(argv[argc]))
                        return (0);

        return (1);
}

/*
 * Helper function to print out vdev/pool names we can't resolve.  Used for an
 * error message.
 */
static void
error_list_unresolved_vdevs(int argc, char **argv, char *pool_name,
    iostat_cbdata_t *cb)
{
        int i;
        char *name;
        char *str;
        for (i = 0; i < argc; i++) {
                name = argv[i];

                if (is_pool(name))
                        str = gettext("pool");
                else if (are_vdevs_in_pool(1, &name, pool_name, cb))
                        str = gettext("vdev in this pool");
                else if (are_vdevs_in_pool(1, &name, NULL, cb))
                        str = gettext("vdev in another pool");
                else
                        str = gettext("unknown");

                fprintf(stderr, "\t%s (%s)\n", name, str);
        }
}

/*
 * Same as get_interval_count(), but with additional checks to not misinterpret
 * guids as interval/count values.  Assumes VDEV_NAME_GUID is set in
 * cb.cb_name_flags.
 */
static void
get_interval_count_filter_guids(int *argc, char **argv, float *interval,
    unsigned long *count, iostat_cbdata_t *cb)
{
        char **tmpargv = argv;
        int argc_for_interval = 0;

        /* Is the last arg an interval value?  Or a guid? */
        if (*argc >= 1 && !are_vdevs_in_pool(1, &argv[*argc - 1], NULL, cb)) {
                /*
                 * The last arg is not a guid, so it's probably an
                 * interval value.
                 */
                argc_for_interval++;

                if (*argc >= 2 &&
                    !are_vdevs_in_pool(1, &argv[*argc - 2], NULL, cb)) {
                        /*
                         * The 2nd to last arg is not a guid, so it's probably
                         * an interval value.
                         */
                        argc_for_interval++;
                }
        }

        /* Point to our list of possible intervals */
        tmpargv = &argv[*argc - argc_for_interval];

        *argc = *argc - argc_for_interval;
        get_interval_count(&argc_for_interval, tmpargv,
            interval, count);
}

/*
 * Floating point sleep().  Allows you to pass in a floating point value for
 * seconds.
 */
static void
fsleep(float sec)
{
        struct timespec req;
        req.tv_sec = floor(sec);
        req.tv_nsec = (sec - (float)req.tv_sec) * NANOSEC;
        nanosleep(&req, NULL);
}

/*
 * Run one of the zpool status/iostat -c scripts with the help (-h) option and
 * print the result.
 *
 * name:        Short name of the script ('iostat').
 * path:        Full path to the script ('/usr/local/etc/zfs/zpool.d/iostat');
 */
static void
print_zpool_script_help(char *name, char *path)
{
        char *argv[] = {path, "-h", NULL};
        char **lines = NULL;
        int lines_cnt = 0;
        int rc;

        rc = libzfs_run_process_get_stdout_nopath(path, argv, NULL, &lines,
            &lines_cnt);
        if (rc != 0 || lines == NULL || lines_cnt <= 0)
                return;

        for (int i = 0; i < lines_cnt; i++)
                if (!is_blank_str(lines[i]))
                        printf("  %-14s  %s\n", name, lines[i]);

        libzfs_free_str_array(lines, lines_cnt);
}


/*
 * Go though the list of all the zpool status/iostat -c scripts, run their
 * help option (-h), and print out the results.
 */
static void
print_zpool_script_list(void)
{
        DIR *dir;
        struct dirent *ent;
        char fullpath[MAXPATHLEN];
        struct stat dir_stat;

        if ((dir = opendir(ZPOOL_SCRIPTS_DIR)) != NULL) {
                printf("\n");
                /* print all the files and directories within directory */
                while ((ent = readdir(dir)) != NULL) {
                        sprintf(fullpath, "%s/%s", ZPOOL_SCRIPTS_DIR,
                            ent->d_name);

                        /* Print the scripts */
                        if (stat(fullpath, &dir_stat) == 0)
                                if (dir_stat.st_mode & S_IXUSR &&
                                    S_ISREG(dir_stat.st_mode))
                                        print_zpool_script_help(ent->d_name,
                                            fullpath);
                }
                printf("\n");
                closedir(dir);
        } else {
                fprintf(stderr, gettext("Can't open %s scripts dir\n"),
                    ZPOOL_SCRIPTS_DIR);
        }
}

/*
 * zpool iostat [[-c [script1,script2,...]] [-lq]|[-rw]] [-ghHLpPvy] [-n name]
 *              [-T d|u] [[ pool ...]|[pool vdev ...]|[vdev ...]]
 *              [interval [count]]
 *
 *      -c CMD  For each vdev, run command CMD
 *      -g      Display guid for individual vdev name.
 *      -L      Follow links when resolving vdev path name.
 *      -P      Display full path for vdev name.
 *      -v      Display statistics for individual vdevs
 *      -h      Display help
 *      -p      Display values in parsable (exact) format.
 *      -H      Scripted mode.  Don't display headers, and separate properties
 *              by a single tab.
 *      -l      Display average latency
 *      -q      Display queue depths
 *      -w      Display latency histograms
 *      -r      Display request size histogram
 *      -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;
        float interval = 0;
        unsigned long count = 0;
        zpool_list_t *list;
        boolean_t verbose = B_FALSE;
        boolean_t latency = B_FALSE, l_histo = B_FALSE, rq_histo = B_FALSE;
        boolean_t queues = B_FALSE, parsable = B_FALSE, scripted = B_FALSE;
        boolean_t omit_since_boot = B_FALSE;
        boolean_t guid = B_FALSE;
        boolean_t follow_links = B_FALSE;
        boolean_t full_name = B_FALSE;
        iostat_cbdata_t cb = { 0 };
        char *cmd = NULL;

        /* Used for printing error message */
        const char flag_to_arg[] = {[IOS_LATENCY] = 'l', [IOS_QUEUES] = 'q',
            [IOS_L_HISTO] = 'w', [IOS_RQ_HISTO] = 'r'};

        uint64_t unsupported_flags;

        /* check options */
        while ((c = getopt(argc, argv, "c:gLPT:vyhplqrwH")) != -1) {
                switch (c) {
                case 'c':
                        if (cmd != NULL) {
                                fprintf(stderr,
                                    gettext("Can't set -c flag twice\n"));
                                exit(1);
                        }
                        if ((getuid() <= 0 || geteuid() <= 0) &&
                            !libzfs_envvar_is_set("ZPOOL_SCRIPTS_AS_ROOT")) {
                                fprintf(stderr, gettext(
                                    "Can't run -c with root privileges "
                                    "unless ZPOOL_SCRIPTS_AS_ROOT is set.\n"));
                                exit(1);
                        }
                        cmd = optarg;
                        verbose = B_TRUE;
                        break;
                case 'g':
                        guid = B_TRUE;
                        break;
                case 'L':
                        follow_links = B_TRUE;
                        break;
                case 'P':
                        full_name = B_TRUE;
                        break;
                case 'T':
                        get_timestamp_arg(*optarg);
                        break;
                case 'v':
                        verbose = B_TRUE;
                        break;
                case 'p':
                        parsable = B_TRUE;
                        break;
                case 'l':
                        latency = B_TRUE;
                        break;
                case 'q':
                        queues = B_TRUE;
                        break;
                case 'H':
                        scripted = B_TRUE;
                        break;
                case 'w':
                        l_histo = B_TRUE;
                        break;
                case 'r':
                        rq_histo = B_TRUE;
                        break;
                case 'y':
                        omit_since_boot = B_TRUE;
                        break;
                case 'h':
                        usage(B_FALSE);
                        break;
                case '?':
                        if (optopt == 'c') {
                                fprintf(stderr, gettext(
                                    "Current scripts in %s:\n"),
                                    ZPOOL_SCRIPTS_DIR);
                                print_zpool_script_list();
                                exit(0);
                        } else {
                                fprintf(stderr,
                                    gettext("invalid option '%c'\n"), optopt);
                        }
                        usage(B_FALSE);
                }
        }

        argc -= optind;
        argv += optind;

        cb.cb_literal = parsable;
        cb.cb_scripted = scripted;

        if (guid)
                cb.cb_name_flags |= VDEV_NAME_GUID;
        if (follow_links)
                cb.cb_name_flags |= VDEV_NAME_FOLLOW_LINKS;
        if (full_name)
                cb.cb_name_flags |= VDEV_NAME_PATH;
        cb.cb_iteration = 0;
        cb.cb_namewidth = 0;
        cb.cb_verbose = verbose;

        /* Get our interval and count values (if any) */
        if (guid) {
                get_interval_count_filter_guids(&argc, argv, &interval,
                    &count, &cb);
        } else {
                get_interval_count(&argc, argv, &interval, &count);
        }

        if (argc == 0) {
                /* No args, so just print the defaults. */
        } else if (are_all_pools(argc, argv)) {
                /* All the args are pool names */
        } else if (are_vdevs_in_pool(argc, argv, NULL, &cb)) {
                /* All the args are vdevs */
                cb.cb_vdev_names = argv;
                cb.cb_vdev_names_count = argc;
                argc = 0; /* No pools to process */
        } else if (are_all_pools(1, argv)) {
                /* The first arg is a pool name */
                if (are_vdevs_in_pool(argc - 1, argv + 1, argv[0], &cb)) {
                        /* ...and the rest are vdev names */
                        cb.cb_vdev_names = argv + 1;
                        cb.cb_vdev_names_count = argc - 1;
                        argc = 1; /* One pool to process */
                } else {
                        fprintf(stderr, gettext("Expected either a list of "));
                        fprintf(stderr, gettext("pools, or list of vdevs in"));
                        fprintf(stderr, " \"%s\", ", argv[0]);
                        fprintf(stderr, gettext("but got:\n"));
                        error_list_unresolved_vdevs(argc - 1, argv + 1,
                            argv[0], &cb);
                        fprintf(stderr, "\n");
                        usage(B_FALSE);
                        return (1);
                }
        } else {
                /*
                 * The args don't make sense. The first arg isn't a pool name,
                 * nor are all the args vdevs.
                 */
                fprintf(stderr, gettext("Unable to parse pools/vdevs list.\n"));
                fprintf(stderr, "\n");
                return (1);
        }

        if (cb.cb_vdev_names_count != 0) {
                /*
                 * If user specified vdevs, it implies verbose.
                 */
                cb.cb_verbose = B_TRUE;
        }

        /*
         * 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);
        }

        if ((l_histo || rq_histo) && (cmd != NULL || latency || queues)) {
                pool_list_free(list);
                (void) fprintf(stderr,
                    gettext("[-r|-w] isn't allowed with [-c|-l|-q]\n"));
                usage(B_FALSE);
                return (1);
        }

        if (l_histo && rq_histo) {
                pool_list_free(list);
                (void) fprintf(stderr,
                    gettext("Only one of [-r|-w] can be passed at a time\n"));
                usage(B_FALSE);
                return (1);
        }

        /*
         * Enter the main iostat loop.
         */
        cb.cb_list = list;

        if (l_histo) {
                /*
                 * Histograms tables look out of place when you try to display
                 * them with the other stats, so make a rule that you can only
                 * print histograms by themselves.
                 */
                cb.cb_flags = IOS_L_HISTO_M;
        } else if (rq_histo) {
                cb.cb_flags = IOS_RQ_HISTO_M;
        } else {
                cb.cb_flags = IOS_DEFAULT_M;
                if (latency)
                        cb.cb_flags |= IOS_LATENCY_M;
                if (queues)
                        cb.cb_flags |= IOS_QUEUES_M;
        }

        /*
         * See if the module supports all the stats we want to display.
         */
        unsupported_flags = cb.cb_flags & ~get_stat_flags(list);
        if (unsupported_flags) {
                uint64_t f;
                int idx;
                fprintf(stderr,
                    gettext("The loaded zfs module doesn't support:"));

                /* for each bit set in unsupported_flags */
                for (f = unsupported_flags; f; f &= ~(1ULL << idx)) {
                        idx = lowbit64(f) - 1;
                        fprintf(stderr, " -%c", flag_to_arg[idx]);
                }

                fprintf(stderr, ".  Try running a newer module.\n");
                pool_list_free(list);

                return (1);
        }

        for (;;) {
                if ((npools = pool_list_count(list)) == 0)
                        (void) fprintf(stderr, gettext("no pools available\n"));
                else {
                        /*
                         * If this is the first iteration and -y was supplied
                         * we skip any printing.
                         */
                        boolean_t skip = (omit_since_boot &&
                            cb.cb_iteration == 0);

                        /*
                         * 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 (cmd != NULL && cb.cb_verbose &&
                            !(cb.cb_flags & IOS_ANYHISTO_M)) {
                                cb.vcdl = all_pools_for_each_vdev_run(argc,
                                    argv, cmd, g_zfs, cb.cb_vdev_names,
                                    cb.cb_vdev_names_count, cb.cb_name_flags);
                        } else {
                                cb.vcdl = NULL;
                        }

                        /*
                         * If it's the first time and we're not skipping it,
                         * or either skip or verbose mode, print the header.
                         *
                         * The histogram code explicitly prints its header on
                         * every vdev, so skip this for histograms.
                         */
                        if (((++cb.cb_iteration == 1 && !skip) ||
                            (skip != verbose)) &&
                            (!(cb.cb_flags & IOS_ANYHISTO_M)) &&
                            !cb.cb_scripted)
                                print_iostat_header(&cb);

                        if (skip) {
                                (void) fsleep(interval);
                                continue;
                        }


                        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.
                         *
                         * In addition, if we're printing specific vdevs then
                         * we also want an ending separator.
                         */
                        if (((npools > 1 && !verbose &&
                            !(cb.cb_flags & IOS_ANYHISTO_M)) ||
                            (!(cb.cb_flags & IOS_ANYHISTO_M) &&
                            cb.cb_vdev_names_count)) &&
                            !cb.cb_scripted) {
                                print_iostat_separator(&cb);
                                if (cb.vcdl != NULL)
                                        print_cmd_columns(cb.vcdl, 1);
                                printf("\n");
                        }

                        if (cb.vcdl != NULL)
                                free_vdev_cmd_data_list(cb.vcdl);

                }

                /*
                 * 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) fsleep(interval);
        }

        pool_list_free(list);

        return (ret);
}

typedef struct list_cbdata {
        boolean_t       cb_verbose;
        int             cb_name_flags;
        int             cb_namewidth;
        boolean_t       cb_scripted;
        zprop_list_t    *cb_proplist;
        boolean_t       cb_literal;
} list_cbdata_t;

/*
 * Given a list of columns to display, output appropriate headers for each one.
 */
static void
print_header(list_cbdata_t *cb)
{
        zprop_list_t *pl = cb->cb_proplist;
        char headerbuf[ZPOOL_MAXPROPLEN];
        const char *header;
        boolean_t first = B_TRUE;
        boolean_t right_justify;
        size_t width = 0;

        for (; pl != NULL; pl = pl->pl_next) {
                width = pl->pl_width;
                if (first && cb->cb_verbose) {
                        /*
                         * Reset the width to accommodate the verbose listing
                         * of devices.
                         */
                        width = cb->cb_namewidth;
                }

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

                right_justify = B_FALSE;
                if (pl->pl_prop != ZPROP_INVAL) {
                        header = zpool_prop_column_name(pl->pl_prop);
                        right_justify = zpool_prop_align_right(pl->pl_prop);
                } else {
                        int i;

                        for (i = 0; pl->pl_user_prop[i] != '\0'; i++)
                                headerbuf[i] = toupper(pl->pl_user_prop[i]);
                        headerbuf[i] = '\0';
                        header = headerbuf;
                }

                if (pl->pl_next == NULL && !right_justify)
                        (void) printf("%s", header);
                else if (right_justify)
                        (void) printf("%*s", (int)width, header);
                else
                        (void) printf("%-*s", (int)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, list_cbdata_t *cb)
{
        zprop_list_t *pl = cb->cb_proplist;
        boolean_t first = B_TRUE;
        char property[ZPOOL_MAXPROPLEN];
        char *propstr;
        boolean_t right_justify;
        size_t width;

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

                width = pl->pl_width;
                if (first && cb->cb_verbose) {
                        /*
                         * Reset the width to accommodate the verbose listing
                         * of devices.
                         */
                        width = cb->cb_namewidth;
                }

                if (!first) {
                        if (cb->cb_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, cb->cb_literal) != 0)
                                propstr = "-";
                        else
                                propstr = property;

                        right_justify = zpool_prop_align_right(pl->pl_prop);
                } else if ((zpool_prop_feature(pl->pl_user_prop) ||
                    zpool_prop_unsupported(pl->pl_user_prop)) &&
                    zpool_prop_get_feature(zhp, pl->pl_user_prop, property,
                    sizeof (property)) == 0) {
                        propstr = property;
                } else {
                        propstr = "-";
                }


                /*
                 * 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 (cb->cb_scripted || (pl->pl_next == NULL && !right_justify))
                        (void) printf("%s", propstr);
                else if (right_justify)
                        (void) printf("%*s", (int)width, propstr);
                else
                        (void) printf("%-*s", (int)width, propstr);
        }

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

static void
print_one_column(zpool_prop_t prop, uint64_t value, boolean_t scripted,
    boolean_t valid, enum zfs_nicenum_format format)
{
        char propval[64];
        boolean_t fixed;
        size_t width = zprop_width(prop, &fixed, ZFS_TYPE_POOL);

        switch (prop) {
        case ZPOOL_PROP_EXPANDSZ:
                if (value == 0)
                        (void) strlcpy(propval, "-", sizeof (propval));
                else
                        zfs_nicenum_format(value, propval, sizeof (propval),
                            format);
                break;
        case ZPOOL_PROP_FRAGMENTATION:
                if (value == ZFS_FRAG_INVALID) {
                        (void) strlcpy(propval, "-", sizeof (propval));
                } else if (format == ZFS_NICENUM_RAW) {
                        (void) snprintf(propval, sizeof (propval), "%llu",
                            (unsigned long long)value);
                } else {
                        (void) snprintf(propval, sizeof (propval), "%llu%%",
                            (unsigned long long)value);
                }
                break;
        case ZPOOL_PROP_CAPACITY:
                if (format == ZFS_NICENUM_RAW)
                        (void) snprintf(propval, sizeof (propval), "%llu",
                            (unsigned long long)value);
                else
                        (void) snprintf(propval, sizeof (propval), "%llu%%",
                            (unsigned long long)value);
                break;
        default:
                zfs_nicenum_format(value, propval, sizeof (propval), format);
        }

        if (!valid)
                (void) strlcpy(propval, "-", sizeof (propval));

        if (scripted)
                (void) printf("\t%s", propval);
        else
                (void) printf("  %*s", (int)width, propval);
}

void
print_list_stats(zpool_handle_t *zhp, const char *name, nvlist_t *nv,
    list_cbdata_t *cb, int depth)
{
        nvlist_t **child;
        vdev_stat_t *vs;
        uint_t c, children;
        char *vname;
        boolean_t scripted = cb->cb_scripted;
        uint64_t islog = B_FALSE;
        boolean_t haslog = B_FALSE;
        char *dashes = "%-*s      -      -      -         -      -      -\n";

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

        if (name != NULL) {
                boolean_t toplevel = (vs->vs_space != 0);
                uint64_t cap;
                enum zfs_nicenum_format format;

                if (cb->cb_literal)
                        format = ZFS_NICENUM_RAW;
                else
                        format = ZFS_NICENUM_1024;

                if (scripted)
                        (void) printf("\t%s", name);
                else 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), "");

                /*
                 * Print the properties for the individual vdevs. Some
                 * properties are only applicable to toplevel vdevs. The
                 * 'toplevel' boolean value is passed to the print_one_column()
                 * to indicate that the value is valid.
                 */
                print_one_column(ZPOOL_PROP_SIZE, vs->vs_space, scripted,
                    toplevel, format);
                print_one_column(ZPOOL_PROP_ALLOCATED, vs->vs_alloc, scripted,
                    toplevel, format);
                print_one_column(ZPOOL_PROP_FREE, vs->vs_space - vs->vs_alloc,
                    scripted, toplevel, format);
                print_one_column(ZPOOL_PROP_EXPANDSZ, vs->vs_esize, scripted,
                    B_TRUE, format);
                print_one_column(ZPOOL_PROP_FRAGMENTATION,
                    vs->vs_fragmentation, scripted,
                    (vs->vs_fragmentation != ZFS_FRAG_INVALID && toplevel),
                    format);
                cap = (vs->vs_space == 0) ? 0 :
                    (vs->vs_alloc * 100 / vs->vs_space);
                print_one_column(ZPOOL_PROP_CAPACITY, cap, scripted, toplevel,
                    format);
                (void) printf("\n");
        }

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

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

                if (nvlist_lookup_uint64(child[c],
                    ZPOOL_CONFIG_IS_HOLE, &ishole) == 0 && ishole)
                        continue;

                if (nvlist_lookup_uint64(child[c],
                    ZPOOL_CONFIG_IS_LOG, &islog) == 0 && islog) {
                        haslog = B_TRUE;
                        continue;
                }

                vname = zpool_vdev_name(g_zfs, zhp, child[c],
                    cb->cb_name_flags);
                print_list_stats(zhp, vname, child[c], cb, depth + 2);
                free(vname);
        }

        if (haslog == B_TRUE) {
                /* LINTED E_SEC_PRINTF_VAR_FMT */
                (void) printf(dashes, cb->cb_namewidth, "log");
                for (c = 0; c < children; c++) {
                        if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
                            &islog) != 0 || !islog)
                                continue;
                        vname = zpool_vdev_name(g_zfs, zhp, child[c],
                            cb->cb_name_flags);
                        print_list_stats(zhp, vname, child[c], cb, depth + 2);
                        free(vname);
                }
        }

        if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_L2CACHE,
            &child, &children) == 0 && children > 0) {
                /* LINTED E_SEC_PRINTF_VAR_FMT */
                (void) printf(dashes, cb->cb_namewidth, "cache");
                for (c = 0; c < children; c++) {
                        vname = zpool_vdev_name(g_zfs, zhp, child[c],
                            cb->cb_name_flags);
                        print_list_stats(zhp, vname, child[c], cb, depth + 2);
                        free(vname);
                }
        }

        if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_SPARES, &child,
            &children) == 0 && children > 0) {
                /* LINTED E_SEC_PRINTF_VAR_FMT */
                (void) printf(dashes, cb->cb_namewidth, "spare");
                for (c = 0; c < children; c++) {
                        vname = zpool_vdev_name(g_zfs, zhp, child[c],
                            cb->cb_name_flags);
                        print_list_stats(zhp, vname, child[c], cb, depth + 2);
                        free(vname);
                }
        }
}


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

        config = zpool_get_config(zhp, NULL);

        print_pool(zhp, cbp);
        if (!cbp->cb_verbose)
                return (0);

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

        return (0);
}

/*
 * zpool list [-gHLpP] [-o prop[,prop]*] [-T d|u] [pool] ... [interval [count]]
 *
 *      -g      Display guid for individual vdev name.
 *      -H      Scripted mode.  Don't display headers, and separate properties
 *              by a single tab.
 *      -L      Follow links when resolving vdev path name.
 *      -o      List of properties to display.  Defaults to
 *              "name,size,allocated,free,expandsize,fragmentation,capacity,"
 *              "dedupratio,health,altroot"
 *      -p      Display values in parsable (exact) format.
 *      -P      Display full path for vdev name.
 *      -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 = 0;
        list_cbdata_t cb = { 0 };
        static char default_props[] =
            "name,size,allocated,free,expandsize,fragmentation,capacity,"
            "dedupratio,health,altroot";
        char *props = default_props;
        float interval = 0;
        unsigned long count = 0;
        zpool_list_t *list;
        boolean_t first = B_TRUE;

        /* check options */
        while ((c = getopt(argc, argv, ":gHLo:pPT:v")) != -1) {
                switch (c) {
                case 'g':
                        cb.cb_name_flags |= VDEV_NAME_GUID;
                        break;
                case 'H':
                        cb.cb_scripted = B_TRUE;
                        break;
                case 'L':
                        cb.cb_name_flags |= VDEV_NAME_FOLLOW_LINKS;
                        break;
                case 'o':
                        props = optarg;
                        break;
                case 'P':
                        cb.cb_name_flags |= VDEV_NAME_PATH;
                        break;
                case 'p':
                        cb.cb_literal = B_TRUE;
                        break;
                case 'T':
                        get_timestamp_arg(*optarg);
                        break;
                case 'v':
                        cb.cb_verbose = 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;

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

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

        for (;;) {
                if ((list = pool_list_get(argc, argv, &cb.cb_proplist,
                    &ret)) == NULL)
                        return (1);

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

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

                if (!cb.cb_scripted && (first || cb.cb_verbose)) {
                        print_header(&cb);
                        first = B_FALSE;
                }
                ret = pool_list_iter(list, B_TRUE, list_callback, &cb);

                if (interval == 0)
                        break;

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

                pool_list_free(list);
                (void) fsleep(interval);
        }

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

        pool_list_free(list);
        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;
        nvlist_t *props = NULL;
        char *propval;
        int ret;

        /* check options */
        while ((c = getopt(argc, argv, "fo:")) != -1) {
                switch (c) {
                case 'f':
                        force = B_TRUE;
                        break;
                case 'o':
                        if ((propval = strchr(optarg, '=')) == NULL) {
                                (void) fprintf(stderr, gettext("missing "
                                    "'=' for -o option\n"));
                                usage(B_FALSE);
                        }
                        *propval = '\0';
                        propval++;

                        if ((strcmp(optarg, ZPOOL_CONFIG_ASHIFT) != 0) ||
                            (add_prop_list(optarg, propval, &props, B_TRUE)))
                                usage(B_FALSE);
                        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) {
                nvlist_free(props);
                return (1);
        }

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

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

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

        nvlist_free(props);
        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] [-o property=value] <pool> <device> <new_device>
 *
 *      -f      Force attach, even if <new_device> appears to be in use.
 *      -o      Set property=value.
 *
 * 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 [-gLnP] [-o prop=val] ...
 *              [-o mntopt] ...
 *              [-R altroot] <pool> <newpool> [<device> ...]
 *
 *      -g      Display guid for individual vdev name.
 *      -L      Follow links when resolving vdev path name.
 *      -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.
 *      -P      Display full path for vdev name.
 *      -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;
        flags.name_flags = 0;

        /* check options */
        while ((c = getopt(argc, argv, ":gLR:no:P")) != -1) {
                switch (c) {
                case 'g':
                        flags.name_flags |= VDEV_NAME_GUID;
                        break;
                case 'L':
                        flags.name_flags |= VDEV_NAME_FOLLOW_LINKS;
                        break;
                case 'R':
                        flags.import = B_TRUE;
                        if (add_prop_list(
                            zpool_prop_to_name(ZPOOL_PROP_ALTROOT), optarg,
                            &props, B_TRUE) != 0) {
                                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) {
                                        nvlist_free(props);
                                        usage(B_FALSE);
                                }
                        } else {
                                mntopts = optarg;
                        }
                        break;
                case 'P':
                        flags.name_flags |= VDEV_NAME_PATH;
                        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) {
                nvlist_free(props);
                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,
                            flags.name_flags);
                }
        }

        zpool_close(zhp);

        if (ret != 0 || flags.dryrun || !flags.import) {
                nvlist_free(config);
                nvlist_free(props);
                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) {
                nvlist_free(config);
                nvlist_free(props);
                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);
        nvlist_free(config);
        nvlist_free(props);

        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);
}


/*
 * zpool reopen <pool>
 *
 * Reopen the pool so that the kernel can update the sizes of all vdevs.
 */
int
zpool_do_reopen(int argc, char **argv)
{
        int c;
        int ret = 0;
        zpool_handle_t *zhp;
        char *pool;

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

        argc--;
        argv++;

        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);
        }

        pool = argv[0];
        if ((zhp = zpool_open_canfail(g_zfs, pool)) == NULL)
                return (1);

        ret = zpool_reopen(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));
}

/*
 * 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("\t%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("\t%s resilvered, %.2f%% done\n"),
                    processed_buf, 100 * fraction_done);
        } else if (ps->pss_func == POOL_SCAN_SCRUB) {
                (void) printf(gettext("\t%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)
                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, status_cbdata_t *cb, nvlist_t **spares,
    uint_t nspares)
{
        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],
                    cb->cb_name_flags);
                print_status_config(zhp, cb, name, spares[i], 2, B_TRUE);
                free(name);
        }
}

static void
print_l2cache(zpool_handle_t *zhp, status_cbdata_t *cb, nvlist_t **l2cache,
    uint_t nl2cache)
{
        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],
                    cb->cb_name_flags);
                print_status_config(zhp, cb, name, l2cache[i], 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 we 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)
                return;

        (void) printf("\n");
        (void) printf(gettext(" dedup: "));
        if (ddo->ddo_count == 0) {
                (void) printf(gettext("no DDT entries\n"));
                return;
        }

        (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;
        zpool_status_t reason;
        zpool_errata_t errata;
        const char *health;
        uint_t c;
        vdev_stat_t *vs;

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

        cbp->cb_count++;

        /*
         * If we were given 'zpool status -x', only report those pools with
         * problems.
         */
        if (cbp->cb_explain &&
            (reason == ZPOOL_STATUS_OK ||
            reason == ZPOOL_STATUS_VERSION_OLDER ||
            reason == ZPOOL_STATUS_FEAT_DISABLED)) {
                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 a "
                    "legacy 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 software that does not support\n\t"
                    "feature flags.\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_FEAT_DISABLED:
                (void) printf(gettext("status: Some supported features are not "
                    "enabled on the pool. The pool can\n\tstill be used, but "
                    "some features are unavailable.\n"));
                (void) printf(gettext("action: Enable all features using "
                    "'zpool upgrade'. Once this is done,\n\tthe pool may no "
                    "longer be accessible by software that does not support\n\t"
                    "the features. See zpool-features(5) for details.\n"));
                break;

        case ZPOOL_STATUS_UNSUP_FEAT_READ:
                (void) printf(gettext("status: The pool cannot be accessed on "
                    "this system because it uses the\n\tfollowing feature(s) "
                    "not supported on this system:\n"));
                zpool_print_unsup_feat(config);
                (void) printf("\n");
                (void) printf(gettext("action: Access the pool from a system "
                    "that supports the required feature(s),\n\tor restore the "
                    "pool from backup.\n"));
                break;

        case ZPOOL_STATUS_UNSUP_FEAT_WRITE:
                (void) printf(gettext("status: The pool can only be accessed "
                    "in read-only mode on this system. It\n\tcannot be "
                    "accessed in read-write mode because it uses the "
                    "following\n\tfeature(s) not supported on this system:\n"));
                zpool_print_unsup_feat(config);
                (void) printf("\n");
                (void) printf(gettext("action: The pool cannot be accessed in "
                    "read-write mode. Import the pool with\n"
                    "\t\"-o readonly=on\", access the pool from a system that "
                    "supports the\n\trequired feature(s), or restore 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 administrator 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;

        case ZPOOL_STATUS_HOSTID_MISMATCH:
                (void) printf(gettext("status: Mismatch between pool hostid "
                    "and system hostid on imported pool.\n\tThis pool was "
                    "previously imported into a system with a different "
                    "hostid,\n\tand then was verbatim imported into this "
                    "system.\n"));
                (void) printf(gettext("action: Export this pool on all systems "
                    "on which it is imported.\n"
                    "\tThen import it to correct the mismatch.\n"));
                break;

        case ZPOOL_STATUS_ERRATA:
                (void) printf(gettext("status: Errata #%d detected.\n"),
                    errata);

                switch (errata) {
                case ZPOOL_ERRATA_NONE:
                        break;

                case ZPOOL_ERRATA_ZOL_2094_SCRUB:
                        (void) printf(gettext("action: To correct the issue "
                            "run 'zpool scrub'.\n"));
                        break;

                default:
                        /*
                         * All errata which allow the pool to be imported
                         * must contain an action message.
                         */
                        assert(0);
                }
                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) {
                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);

                cbp->cb_namewidth = max_width(zhp, nvroot, 0, 0,
                    cbp->cb_name_flags | VDEV_NAME_TYPE_ID);
                if (cbp->cb_namewidth < 10)
                        cbp->cb_namewidth = 10;

                (void) printf(gettext("config:\n\n"));
                (void) printf(gettext("\t%-*s  %-8s %5s %5s %5s"),
                    cbp->cb_namewidth, "NAME", "STATE", "READ", "WRITE",
                    "CKSUM");

                if (cbp->vcdl != NULL)
                        print_cmd_columns(cbp->vcdl, 0);

                printf("\n");
                print_status_config(zhp, cbp, zpool_get_name(zhp), nvroot, 0,
                    B_FALSE);

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

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

                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 [-c [script1,script2,...]] [-gLPvx] [-T d|u] [pool] ...
 *              [interval [count]]
 *
 *      -c CMD  For each vdev, run command CMD
 *      -g      Display guid for individual vdev name.
 *      -L      Follow links when resolving vdev path name.
 *      -P      Display full path for vdev name.
 *      -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;
        float interval = 0;
        unsigned long count = 0;
        status_cbdata_t cb = { 0 };
        char *cmd = NULL;

        /* check options */
        while ((c = getopt(argc, argv, "c:gLPvxDT:")) != -1) {
                switch (c) {
                case 'c':
                        if (cmd != NULL) {
                                fprintf(stderr,
                                    gettext("Can't set -c flag twice\n"));
                                exit(1);
                        }
                        if ((getuid() <= 0 || geteuid() <= 0) &&
                            !libzfs_envvar_is_set("ZPOOL_SCRIPTS_AS_ROOT")) {
                                fprintf(stderr, gettext(
                                    "Can't run -c with root privileges "
                                    "unless ZPOOL_SCRIPTS_AS_ROOT is set.\n"));
                                exit(1);
                        }
                        cmd = optarg;
                        break;
                case 'g':
                        cb.cb_name_flags |= VDEV_NAME_GUID;
                        break;
                case 'L':
                        cb.cb_name_flags |= VDEV_NAME_FOLLOW_LINKS;
                        break;
                case 'P':
                        cb.cb_name_flags |= VDEV_NAME_PATH;
                        break;
                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 '?':
                        if (optopt == 'c') {
                                fprintf(stderr, gettext(
                                    "Current scripts in %s:\n"),
                                    ZPOOL_SCRIPTS_DIR);
                                print_zpool_script_list();
                                exit(0);
                        } else {
                                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;
        cb.cb_print_status = B_TRUE;

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

                if (cmd != NULL)
                        cb.vcdl = all_pools_for_each_vdev_run(argc, argv, cmd,
                            NULL, NULL, 0, 0);

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

                if (cb.vcdl != NULL)
                        free_vdev_cmd_data_list(cb.vcdl);

                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) fsleep(interval);
        }

        return (0);
}

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

static int
check_unsupp_fs(zfs_handle_t *zhp, void *unsupp_fs)
{
        int zfs_version = (int)zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
        int *count = (int *)unsupp_fs;

        if (zfs_version > ZPL_VERSION) {
                (void) printf(gettext("%s (v%d) is not supported by this "
                    "implementation of ZFS.\n"),
                    zfs_get_name(zhp), zfs_version);
                (*count)++;
        }

        zfs_iter_filesystems(zhp, check_unsupp_fs, unsupp_fs);

        zfs_close(zhp);

        return (0);
}

static int
upgrade_version(zpool_handle_t *zhp, uint64_t version)
{
        int ret;
        nvlist_t *config;
        uint64_t oldversion;
        int unsupp_fs = 0;

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

        assert(SPA_VERSION_IS_SUPPORTED(oldversion));
        assert(oldversion < version);

        ret = zfs_iter_root(zpool_get_handle(zhp), check_unsupp_fs, &unsupp_fs);
        if (ret != 0)
                return (ret);

        if (unsupp_fs) {
                (void) fprintf(stderr, gettext("Upgrade not performed due "
                    "to %d unsupported filesystems (max v%d).\n"),
                    unsupp_fs, (int)ZPL_VERSION);
                return (1);
        }

        ret = zpool_upgrade(zhp, version);
        if (ret != 0)
                return (ret);

        if (version >= SPA_VERSION_FEATURES) {
                (void) printf(gettext("Successfully upgraded "
                    "'%s' from version %llu to feature flags.\n"),
                    zpool_get_name(zhp), (u_longlong_t)oldversion);
        } else {
                (void) printf(gettext("Successfully upgraded "
                    "'%s' from version %llu to version %llu.\n"),
                    zpool_get_name(zhp), (u_longlong_t)oldversion,
                    (u_longlong_t)version);
        }

        return (0);
}

static int
upgrade_enable_all(zpool_handle_t *zhp, int *countp)
{
        int i, ret, count;
        boolean_t firstff = B_TRUE;
        nvlist_t *enabled = zpool_get_features(zhp);

        count = 0;
        for (i = 0; i < SPA_FEATURES; i++) {
                const char *fname = spa_feature_table[i].fi_uname;
                const char *fguid = spa_feature_table[i].fi_guid;
                if (!nvlist_exists(enabled, fguid)) {
                        char *propname;
                        verify(-1 != asprintf(&propname, "feature@%s", fname));
                        ret = zpool_set_prop(zhp, propname,
                            ZFS_FEATURE_ENABLED);
                        if (ret != 0) {
                                free(propname);
                                return (ret);
                        }
                        count++;

                        if (firstff) {
                                (void) printf(gettext("Enabled the "
                                    "following features on '%s':\n"),
                                    zpool_get_name(zhp));
                                firstff = B_FALSE;
                        }
                        (void) printf(gettext("  %s\n"), fname);
                        free(propname);
                }
        }

        if (countp != NULL)
                *countp = count;
        return (0);
}

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

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

        assert(SPA_VERSION_IS_SUPPORTED(version));

        if (version < cbp->cb_version) {
                cbp->cb_first = B_FALSE;
                ret = upgrade_version(zhp, cbp->cb_version);
                if (ret != 0)
                        return (ret);
                printnl = B_TRUE;

                /*
                 * If they did "zpool upgrade -a", then we could
                 * be doing ioctls to different pools.  We need
                 * to log this history once to each pool, and bypass
                 * the normal history logging that happens in main().
                 */
                (void) zpool_log_history(g_zfs, history_str);
                log_history = B_FALSE;
        }

        if (cbp->cb_version >= SPA_VERSION_FEATURES) {
                int count;
                ret = upgrade_enable_all(zhp, &count);
                if (ret != 0)
                        return (ret);

                if (count > 0) {
                        cbp->cb_first = B_FALSE;
                        printnl = B_TRUE;
                }
        }

        if (printnl) {
                (void) printf(gettext("\n"));
        }

        return (0);
}

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

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

        assert(SPA_VERSION_IS_SUPPORTED(version));

        if (version < SPA_VERSION_FEATURES) {
                if (cbp->cb_first) {
                        (void) printf(gettext("The following pools are "
                            "formatted with legacy version numbers and can\n"
                            "be upgraded to use feature flags.  After "
                            "being upgraded, these pools\nwill no "
                            "longer be accessible by software that does not "
                            "support feature\nflags.\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));
        }

        return (0);
}

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

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

        if (version >= SPA_VERSION_FEATURES) {
                int i;
                boolean_t poolfirst = B_TRUE;
                nvlist_t *enabled = zpool_get_features(zhp);

                for (i = 0; i < SPA_FEATURES; i++) {
                        const char *fguid = spa_feature_table[i].fi_guid;
                        const char *fname = spa_feature_table[i].fi_uname;
                        if (!nvlist_exists(enabled, fguid)) {
                                if (cbp->cb_first) {
                                        (void) printf(gettext("\nSome "
                                            "supported features are not "
                                            "enabled on the following pools. "
                                            "Once a\nfeature is enabled the "
                                            "pool may become incompatible with "
                                            "software\nthat does not support "
                                            "the feature. See "
                                            "zpool-features(5) for "
                                            "details.\n\n"));
                                        (void) printf(gettext("POOL  "
                                            "FEATURE\n"));
                                        (void) printf(gettext("------"
                                            "---------\n"));
                                        cbp->cb_first = B_FALSE;
                                }

                                if (poolfirst) {
                                        (void) printf(gettext("%s\n"),
                                            zpool_get_name(zhp));
                                        poolfirst = B_FALSE;
                                }

                                (void) printf(gettext("      %s\n"), fname);
                        }
                        /*
                         * If they did "zpool upgrade -a", then we could
                         * be doing ioctls to different pools.  We need
                         * to log this history once to each pool, and bypass
                         * the normal history logging that happens in main().
                         */
                        (void) zpool_log_history(g_zfs, history_str);
                        log_history = B_FALSE;
                }
        }

        return (0);
}

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

        if (strcmp("log", zpool_get_name(zhp)) == 0) {
                (void) fprintf(stderr, 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\n"),
                    zpool_get_name(zhp), (u_longlong_t)cur_version);
                return (0);
        }

        if (cbp->cb_version != SPA_VERSION && cur_version == cbp->cb_version) {
                (void) printf(gettext("Pool '%s' is already formatted "
                    "using version %llu.\n\n"), zpool_get_name(zhp),
                    (u_longlong_t)cbp->cb_version);
                return (0);
        }

        if (cur_version != cbp->cb_version) {
                printnl = B_TRUE;
                ret = upgrade_version(zhp, cbp->cb_version);
                if (ret != 0)
                        return (ret);
        }

        if (cbp->cb_version >= SPA_VERSION_FEATURES) {
                int count = 0;
                ret = upgrade_enable_all(zhp, &count);
                if (ret != 0)
                        return (ret);

                if (count != 0) {
                        printnl = B_TRUE;
                } else if (cur_version == SPA_VERSION) {
                        (void) printf(gettext("Pool '%s' already has all "
                            "supported features enabled.\n"),
                            zpool_get_name(zhp));
                }
        }

        if (printnl) {
                (void) printf(gettext("\n"));
        }

        return (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;
        boolean_t upgradeall = B_FALSE;
        char *end;


        /* check options */
        while ((c = getopt(argc, argv, ":avV:")) != -1) {
                switch (c) {
                case 'a':
                        upgradeall = B_TRUE;
                        break;
                case 'v':
                        showversions = B_TRUE;
                        break;
                case 'V':
                        cb.cb_version = strtoll(optarg, &end, 10);
                        if (*end != '\0' ||
                            !SPA_VERSION_IS_SUPPORTED(cb.cb_version)) {
                                (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 (!upgradeall && argc == 0) {
                (void) fprintf(stderr, gettext("-V option is "
                    "incompatible with other arguments\n"));
                usage(B_FALSE);
        }

        if (showversions) {
                if (upgradeall || argc != 0) {
                        (void) fprintf(stderr, gettext("-v option is "
                            "incompatible with other arguments\n"));
                        usage(B_FALSE);
                }
        } else if (upgradeall) {
                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 supports ZFS pool feature "
            "flags.\n\n"));
        if (showversions) {
                int i;

                (void) printf(gettext("The following features are "
                    "supported:\n\n"));
                (void) printf(gettext("FEAT DESCRIPTION\n"));
                (void) printf("----------------------------------------------"
                    "---------------\n");
                for (i = 0; i < SPA_FEATURES; i++) {
                        zfeature_info_t *fi = &spa_feature_table[i];
                        const char *ro =
                            (fi->fi_flags & ZFEATURE_FLAG_READONLY_COMPAT) ?
                            " (read-only compatible)" : "";

                        (void) printf("%-37s%s\n", fi->fi_uname, ro);
                        (void) printf("     %s\n", fi->fi_desc);
                }
                (void) printf("\n");

                (void) printf(gettext("The following legacy versions are also "
                    "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 && upgradeall) {
                cb.cb_first = B_TRUE;
                ret = zpool_iter(g_zfs, upgrade_cb, &cb);
                if (ret == 0 && cb.cb_first) {
                        if (cb.cb_version == SPA_VERSION) {
                                (void) printf(gettext("All pools are already "
                                    "formatted using feature flags.\n\n"));
                                (void) printf(gettext("Every feature flags "
                                    "pool already has all supported features "
                                    "enabled.\n"));
                        } else {
                                (void) printf(gettext("All pools are already "
                                    "formatted with version %llu or higher.\n"),
                                    (u_longlong_t)cb.cb_version);
                        }
                }
        } else if (argc == 0) {
                cb.cb_first = B_TRUE;
                ret = zpool_iter(g_zfs, upgrade_list_older_cb, &cb);
                assert(ret == 0);

                if (cb.cb_first) {
                        (void) printf(gettext("All pools are formatted "
                            "using feature flags.\n\n"));
                } else {
                        (void) printf(gettext("\nUse 'zpool upgrade -v' "
                            "for a list of available legacy versions.\n"));
                }

                cb.cb_first = B_TRUE;
                ret = zpool_iter(g_zfs, upgrade_list_disabled_cb, &cb);
                assert(ret == 0);

                if (cb.cb_first) {
                        (void) printf(gettext("Every feature flags pool has "
                            "all supported features enabled.\n"));
                } else {
                        (void) printf(gettext("\n"));
                }
        } else {
                ret = for_each_pool(argc, argv, B_FALSE, NULL,
                    upgrade_one, &cb);
        }

        return (ret);
}

typedef struct hist_cbdata {
        boolean_t first;
        boolean_t longfmt;
        boolean_t 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;
        int ret, i;
        hist_cbdata_t *cb = (hist_cbdata_t *)data;

        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++) {
                nvlist_t *rec = records[i];
                char tbuf[30] = "";

                if (nvlist_exists(rec, ZPOOL_HIST_TIME)) {
                        time_t tsec;
                        struct tm t;

                        tsec = fnvlist_lookup_uint64(records[i],
                            ZPOOL_HIST_TIME);
                        (void) localtime_r(&tsec, &t);
                        (void) strftime(tbuf, sizeof (tbuf), "%F.%T", &t);
                }

                if (nvlist_exists(rec, ZPOOL_HIST_CMD)) {
                        (void) printf("%s %s", tbuf,
                            fnvlist_lookup_string(rec, ZPOOL_HIST_CMD));
                } else if (nvlist_exists(rec, ZPOOL_HIST_INT_EVENT)) {
                        int ievent =
                            fnvlist_lookup_uint64(rec, ZPOOL_HIST_INT_EVENT);
                        if (!cb->internal)
                                continue;
                        if (ievent >= ZFS_NUM_LEGACY_HISTORY_EVENTS) {
                                (void) printf("%s unrecognized record:\n",
                                    tbuf);
                                dump_nvlist(rec, 4);
                                continue;
                        }
                        (void) printf("%s [internal %s txg:%lld] %s", tbuf,
                            zfs_history_event_names[ievent],
                            (longlong_t)fnvlist_lookup_uint64(
                            rec, ZPOOL_HIST_TXG),
                            fnvlist_lookup_string(rec, ZPOOL_HIST_INT_STR));
                } else if (nvlist_exists(rec, ZPOOL_HIST_INT_NAME)) {
                        if (!cb->internal)
                                continue;
                        (void) printf("%s [txg:%lld] %s", tbuf,
                            (longlong_t)fnvlist_lookup_uint64(
                            rec, ZPOOL_HIST_TXG),
                            fnvlist_lookup_string(rec, ZPOOL_HIST_INT_NAME));
                        if (nvlist_exists(rec, ZPOOL_HIST_DSNAME)) {
                                (void) printf(" %s (%llu)",
                                    fnvlist_lookup_string(rec,
                                    ZPOOL_HIST_DSNAME),
                                    (u_longlong_t)fnvlist_lookup_uint64(rec,
                                    ZPOOL_HIST_DSID));
                        }
                        (void) printf(" %s", fnvlist_lookup_string(rec,
                            ZPOOL_HIST_INT_STR));
                } else if (nvlist_exists(rec, ZPOOL_HIST_IOCTL)) {
                        if (!cb->internal)
                                continue;
                        (void) printf("%s ioctl %s\n", tbuf,
                            fnvlist_lookup_string(rec, ZPOOL_HIST_IOCTL));
                        if (nvlist_exists(rec, ZPOOL_HIST_INPUT_NVL)) {
                                (void) printf("    input:\n");
                                dump_nvlist(fnvlist_lookup_nvlist(rec,
                                    ZPOOL_HIST_INPUT_NVL), 8);
                        }
                        if (nvlist_exists(rec, ZPOOL_HIST_OUTPUT_NVL)) {
                                (void) printf("    output:\n");
                                dump_nvlist(fnvlist_lookup_nvlist(rec,
                                    ZPOOL_HIST_OUTPUT_NVL), 8);
                        }
                } else {
                        if (!cb->internal)
                                continue;
                        (void) printf("%s unrecognized record:\n", tbuf);
                        dump_nvlist(rec, 4);
                }

                if (!cb->longfmt) {
                        (void) printf("\n");
                        continue;
                }
                (void) printf(" [");
                if (nvlist_exists(rec, ZPOOL_HIST_WHO)) {
                        uid_t who = fnvlist_lookup_uint64(rec, ZPOOL_HIST_WHO);
                        struct passwd *pwd = getpwuid(who);
                        (void) printf("user %d ", (int)who);
                        if (pwd != NULL)
                                (void) printf("(%s) ", pwd->pw_name);
                }
                if (nvlist_exists(rec, ZPOOL_HIST_HOST)) {
                        (void) printf("on %s",
                            fnvlist_lookup_string(rec, ZPOOL_HIST_HOST));
                }
                if (nvlist_exists(rec, ZPOOL_HIST_ZONE)) {
                        (void) printf(":%s",
                            fnvlist_lookup_string(rec, ZPOOL_HIST_ZONE));
                }

                (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 = B_TRUE;
                        break;
                case 'i':
                        cbdata.internal = B_TRUE;
                        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);
                        /*
                         * translate vdev state values to readable
                         * strings to aide zpool events consumers
                         */
                        if (strcmp(name,
                            FM_EREPORT_PAYLOAD_ZFS_VDEV_STATE) == 0 ||
                            strcmp(name,
                            FM_EREPORT_PAYLOAD_ZFS_VDEV_LASTSTATE) == 0) {
                                printf(gettext("\"%s\" (0x%llx)"),
                                    zpool_state_to_name(i64, VDEV_AUX_NONE),
                                    (u_longlong_t)i64);
                        } else {
                                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: {
                        char **str;
                        uint_t i, nelem;

                        (void) nvpair_value_string_array(nvp, &str, &nelem);
                        for (i = 0; i < nelem; i++)
                                printf(gettext("\"%s\" "),
                                    str[i] ? str[i] : "<NULL>");

                        break;
                        }

                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 zevent_fd, ret, dropped;

        zevent_fd = open(ZFS_DEV, O_RDWR);
        VERIFY(zevent_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 ? ZEVENT_NONE : ZEVENT_NONBLOCK), zevent_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"));
                }
                (void) fflush(stdout);

                nvlist_free(nvl);
        }

        VERIFY(0 == close(zevent_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 (pl->pl_prop == ZPROP_INVAL &&
                    (zpool_prop_feature(pl->pl_user_prop) ||
                    zpool_prop_unsupported(pl->pl_user_prop))) {
                        srctype = ZPROP_SRC_LOCAL;

                        if (zpool_prop_get_feature(zhp, pl->pl_user_prop,
                            value, sizeof (value)) == 0) {
                                zprop_print_one_property(zpool_get_name(zhp),
                                    cbp, pl->pl_user_prop, value, srctype,
                                    NULL, NULL);
                        }
                } else {
                        if (zpool_get_prop(zhp, pl->pl_prop, value,
                            sizeof (value), &srctype, cbp->cb_literal) != 0)
                                continue;

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

/*
 * zpool get [-Hp] [-o "all" | field[,...]] <"all" | property[,...]> <pool> ...
 *
 *      -H      Scripted mode.  Don't display headers, and separate properties
 *              by a single tab.
 *      -o      List of columns to display.  Defaults to
 *              "name,property,value,source".
 *      -p      Display values in parsable (exact) format.
 *
 * Get properties of pools in the system. Output space statistics
 * for each one as well as other attributes.
 */
int
zpool_do_get(int argc, char **argv)
{
        zprop_get_cbdata_t cb = { 0 };
        zprop_list_t fake_name = { 0 };
        int ret;
        int c, i;
        char *value;

        cb.cb_first = B_TRUE;

        /*
         * Set up default columns and sources.
         */
        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;

        /* check options */
        while ((c = getopt(argc, argv, ":Hpo:")) != -1) {
                switch (c) {
                case 'p':
                        cb.cb_literal = B_TRUE;
                        break;
                case 'H':
                        cb.cb_scripted = B_TRUE;
                        break;
                case 'o':
                        bzero(&cb.cb_columns, sizeof (cb.cb_columns));
                        i = 0;
                        while (*optarg != '\0') {
                                static char *col_subopts[] =
                                { "name", "property", "value", "source",
                                "all", NULL };

                                if (i == ZFS_GET_NCOLS) {
                                        (void) fprintf(stderr, gettext("too "
                                        "many fields given to -o "
                                        "option\n"));
                                        usage(B_FALSE);
                                }

                                switch (getsubopt(&optarg, col_subopts,
                                    &value)) {
                                case 0:
                                        cb.cb_columns[i++] = GET_COL_NAME;
                                        break;
                                case 1:
                                        cb.cb_columns[i++] = GET_COL_PROPERTY;
                                        break;
                                case 2:
                                        cb.cb_columns[i++] = GET_COL_VALUE;
                                        break;
                                case 3:
                                        cb.cb_columns[i++] = GET_COL_SOURCE;
                                        break;
                                case 4:
                                        if (i > 0) {
                                                (void) fprintf(stderr,
                                                    gettext("\"all\" conflicts "
                                                    "with specific fields "
                                                    "given to -o option\n"));
                                                usage(B_FALSE);
                                        }
                                        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;
                                        i = ZFS_GET_NCOLS;
                                        break;
                                default:
                                        (void) fprintf(stderr,
                                            gettext("invalid column name "
                                            "'%s'\n"), value);
                                        usage(B_FALSE);
                                }
                        }
                        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 property "
                    "argument\n"));
                usage(B_FALSE);
        }

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

        argc--;
        argv++;

        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, argv, 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 = 0;
        int i = 0;
        char *cmdname;

        (void) setlocale(LC_ALL, "");
        (void) textdomain(TEXT_DOMAIN);
        srand(time(NULL));

        dprintf_setup(&argc, argv);

        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) {
                (void) fprintf(stderr, "%s", libzfs_error_init(errno));
                return (1);
        }

        libzfs_print_on_error(g_zfs, B_TRUE);

        zfs_save_arguments(argc, argv, history_str, sizeof (history_str));

        /*
         * 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) strlcpy((void *)buf, argv[2], sizeof (buf));
                return (!!ioctl(fd, ZFS_IOC_POOL_FREEZE, buf));
        } else {
                (void) fprintf(stderr, gettext("unrecognized "
                    "command '%s'\n"), cmdname);
                usage(B_FALSE);
                ret = 1;
        }

        if (ret == 0 && log_history)
                (void) zpool_log_history(g_zfs, history_str);

        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);
}