Illumos #3603, #3604: bobj improvements

[zfs] / cmd / zdb / zdb.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 (c) 2012 by Delphix. All rights reserved.
 */

#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/zfs_context.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
#include <sys/dmu.h>
#include <sys/zap.h>
#include <sys/fs/zfs.h>
#include <sys/zfs_znode.h>
#include <sys/zfs_sa.h>
#include <sys/sa.h>
#include <sys/sa_impl.h>
#include <sys/vdev.h>
#include <sys/vdev_impl.h>
#include <sys/metaslab_impl.h>
#include <sys/dmu_objset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_pool.h>
#include <sys/dbuf.h>
#include <sys/zil.h>
#include <sys/zil_impl.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <sys/dmu_traverse.h>
#include <sys/zio_checksum.h>
#include <sys/zio_compress.h>
#include <sys/zfs_fuid.h>
#include <sys/arc.h>
#include <sys/ddt.h>
#include <sys/zfeature.h>
#include <zfs_comutil.h>
#undef ZFS_MAXNAMELEN
#include <libzfs.h>

#define ZDB_COMPRESS_NAME(idx) ((idx) < ZIO_COMPRESS_FUNCTIONS ?        \
        zio_compress_table[(idx)].ci_name : "UNKNOWN")
#define ZDB_CHECKSUM_NAME(idx) ((idx) < ZIO_CHECKSUM_FUNCTIONS ?        \
        zio_checksum_table[(idx)].ci_name : "UNKNOWN")
#define ZDB_OT_NAME(idx) ((idx) < DMU_OT_NUMTYPES ?     \
        dmu_ot[(idx)].ot_name : DMU_OT_IS_VALID(idx) ?  \
        dmu_ot_byteswap[DMU_OT_BYTESWAP(idx)].ob_name : "UNKNOWN")
#define ZDB_OT_TYPE(idx) ((idx) < DMU_OT_NUMTYPES ? (idx) :             \
        (((idx) == DMU_OTN_ZAP_DATA || (idx) == DMU_OTN_ZAP_METADATA) ? \
        DMU_OT_ZAP_OTHER : DMU_OT_NUMTYPES))

#ifndef lint
extern int zfs_recover;
#else
int zfs_recover;
#endif

const char cmdname[] = "zdb";
uint8_t dump_opt[256];

typedef void object_viewer_t(objset_t *, uint64_t, void *data, size_t size);

extern void dump_intent_log(zilog_t *);
uint64_t *zopt_object = NULL;
int zopt_objects = 0;
libzfs_handle_t *g_zfs;
uint64_t max_inflight = 200;

/*
 * These libumem hooks provide a reasonable set of defaults for the allocator's
 * debugging facilities.
 */
const char *
_umem_debug_init(void)
{
        return ("default,verbose"); /* $UMEM_DEBUG setting */
}

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

static void
usage(void)
{
        (void) fprintf(stderr,
            "Usage: %s [-CumdibcsDvhLXFPA] [-t txg] [-e [-p path...]] "
            "[-U config] [-M inflight I/Os] poolname [object...]\n"
            "       %s [-divPA] [-e -p path...] [-U config] dataset "
            "[object...]\n"
            "       %s -m [-LXFPA] [-t txg] [-e [-p path...]] [-U config] "
            "poolname [vdev [metaslab...]]\n"
            "       %s -R [-A] [-e [-p path...]] poolname "
            "vdev:offset:size[:flags]\n"
            "       %s -S [-PA] [-e [-p path...]] [-U config] poolname\n"
            "       %s -l [-uA] device\n"
            "       %s -C [-A] [-U config]\n\n",
            cmdname, cmdname, cmdname, cmdname, cmdname, cmdname, cmdname);

        (void) fprintf(stderr, "    Dataset name must include at least one "
            "separator character '/' or '@'\n");
        (void) fprintf(stderr, "    If dataset name is specified, only that "
            "dataset is dumped\n");
        (void) fprintf(stderr, "    If object numbers are specified, only "
            "those objects are dumped\n\n");
        (void) fprintf(stderr, "    Options to control amount of output:\n");
        (void) fprintf(stderr, "        -u uberblock\n");
        (void) fprintf(stderr, "        -d dataset(s)\n");
        (void) fprintf(stderr, "        -i intent logs\n");
        (void) fprintf(stderr, "        -C config (or cachefile if alone)\n");
        (void) fprintf(stderr, "        -h pool history\n");
        (void) fprintf(stderr, "        -b block statistics\n");
        (void) fprintf(stderr, "        -m metaslabs\n");
        (void) fprintf(stderr, "        -c checksum all metadata (twice for "
            "all data) blocks\n");
        (void) fprintf(stderr, "        -s report stats on zdb's I/O\n");
        (void) fprintf(stderr, "        -D dedup statistics\n");
        (void) fprintf(stderr, "        -S simulate dedup to measure effect\n");
        (void) fprintf(stderr, "        -v verbose (applies to all others)\n");
        (void) fprintf(stderr, "        -l dump label contents\n");
        (void) fprintf(stderr, "        -L disable leak tracking (do not "
            "load spacemaps)\n");
        (void) fprintf(stderr, "        -R read and display block from a "
            "device\n\n");
        (void) fprintf(stderr, "    Below options are intended for use "
            "with other options (except -l):\n");
        (void) fprintf(stderr, "        -A ignore assertions (-A), enable "
            "panic recovery (-AA) or both (-AAA)\n");
        (void) fprintf(stderr, "        -F attempt automatic rewind within "
            "safe range of transaction groups\n");
        (void) fprintf(stderr, "        -U <cachefile_path> -- use alternate "
            "cachefile\n");
        (void) fprintf(stderr, "        -X attempt extreme rewind (does not "
            "work with dataset)\n");
        (void) fprintf(stderr, "        -e pool is exported/destroyed/"
            "has altroot/not in a cachefile\n");
        (void) fprintf(stderr, "        -p <path> -- use one or more with "
            "-e to specify path to vdev dir\n");
        (void) fprintf(stderr, "        -P print numbers in parseable form\n");
        (void) fprintf(stderr, "        -t <txg> -- highest txg to use when "
            "searching for uberblocks\n");
        (void) fprintf(stderr, "        -M <number of inflight I/Os> -- "
            "specify the maximum number of checksumming I/Os [default is 200]\n");
        (void) fprintf(stderr, "Specify an option more than once (e.g. -bb) "
            "to make only that option verbose\n");
        (void) fprintf(stderr, "Default is to dump everything non-verbosely\n");
        exit(1);
}

/*
 * Called for usage errors that are discovered after a call to spa_open(),
 * dmu_bonus_hold(), or pool_match().  abort() is called for other errors.
 */

static void
fatal(const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        (void) fprintf(stderr, "%s: ", cmdname);
        (void) vfprintf(stderr, fmt, ap);
        va_end(ap);
        (void) fprintf(stderr, "\n");

        exit(1);
}

/* ARGSUSED */
static void
dump_packed_nvlist(objset_t *os, uint64_t object, void *data, size_t size)
{
        nvlist_t *nv;
        size_t nvsize = *(uint64_t *)data;
        char *packed = umem_alloc(nvsize, UMEM_NOFAIL);

        VERIFY(0 == dmu_read(os, object, 0, nvsize, packed, DMU_READ_PREFETCH));

        VERIFY(nvlist_unpack(packed, nvsize, &nv, 0) == 0);

        umem_free(packed, nvsize);

        dump_nvlist(nv, 8);

        nvlist_free(nv);
}

/* ARGSUSED */
static void
dump_history_offsets(objset_t *os, uint64_t object, void *data, size_t size)
{
        spa_history_phys_t *shp = data;

        if (shp == NULL)
                return;

        (void) printf("\t\tpool_create_len = %llu\n",
            (u_longlong_t)shp->sh_pool_create_len);
        (void) printf("\t\tphys_max_off = %llu\n",
            (u_longlong_t)shp->sh_phys_max_off);
        (void) printf("\t\tbof = %llu\n",
            (u_longlong_t)shp->sh_bof);
        (void) printf("\t\teof = %llu\n",
            (u_longlong_t)shp->sh_eof);
        (void) printf("\t\trecords_lost = %llu\n",
            (u_longlong_t)shp->sh_records_lost);
}

static void
zdb_nicenum(uint64_t num, char *buf)
{
        if (dump_opt['P'])
                (void) sprintf(buf, "%llu", (longlong_t)num);
        else
                nicenum(num, buf);
}

const char dump_zap_stars[] = "****************************************";
const int dump_zap_width = sizeof (dump_zap_stars) - 1;

static void
dump_zap_histogram(uint64_t histo[ZAP_HISTOGRAM_SIZE])
{
        int i;
        int minidx = ZAP_HISTOGRAM_SIZE - 1;
        int maxidx = 0;
        uint64_t max = 0;

        for (i = 0; i < ZAP_HISTOGRAM_SIZE; i++) {
                if (histo[i] > max)
                        max = histo[i];
                if (histo[i] > 0 && i > maxidx)
                        maxidx = i;
                if (histo[i] > 0 && i < minidx)
                        minidx = i;
        }

        if (max < dump_zap_width)
                max = dump_zap_width;

        for (i = minidx; i <= maxidx; i++)
                (void) printf("\t\t\t%u: %6llu %s\n", i, (u_longlong_t)histo[i],
                    &dump_zap_stars[(max - histo[i]) * dump_zap_width / max]);
}

static void
dump_zap_stats(objset_t *os, uint64_t object)
{
        int error;
        zap_stats_t zs;

        error = zap_get_stats(os, object, &zs);
        if (error)
                return;

        if (zs.zs_ptrtbl_len == 0) {
                ASSERT(zs.zs_num_blocks == 1);
                (void) printf("\tmicrozap: %llu bytes, %llu entries\n",
                    (u_longlong_t)zs.zs_blocksize,
                    (u_longlong_t)zs.zs_num_entries);
                return;
        }

        (void) printf("\tFat ZAP stats:\n");

        (void) printf("\t\tPointer table:\n");
        (void) printf("\t\t\t%llu elements\n",
            (u_longlong_t)zs.zs_ptrtbl_len);
        (void) printf("\t\t\tzt_blk: %llu\n",
            (u_longlong_t)zs.zs_ptrtbl_zt_blk);
        (void) printf("\t\t\tzt_numblks: %llu\n",
            (u_longlong_t)zs.zs_ptrtbl_zt_numblks);
        (void) printf("\t\t\tzt_shift: %llu\n",
            (u_longlong_t)zs.zs_ptrtbl_zt_shift);
        (void) printf("\t\t\tzt_blks_copied: %llu\n",
            (u_longlong_t)zs.zs_ptrtbl_blks_copied);
        (void) printf("\t\t\tzt_nextblk: %llu\n",
            (u_longlong_t)zs.zs_ptrtbl_nextblk);

        (void) printf("\t\tZAP entries: %llu\n",
            (u_longlong_t)zs.zs_num_entries);
        (void) printf("\t\tLeaf blocks: %llu\n",
            (u_longlong_t)zs.zs_num_leafs);
        (void) printf("\t\tTotal blocks: %llu\n",
            (u_longlong_t)zs.zs_num_blocks);
        (void) printf("\t\tzap_block_type: 0x%llx\n",
            (u_longlong_t)zs.zs_block_type);
        (void) printf("\t\tzap_magic: 0x%llx\n",
            (u_longlong_t)zs.zs_magic);
        (void) printf("\t\tzap_salt: 0x%llx\n",
            (u_longlong_t)zs.zs_salt);

        (void) printf("\t\tLeafs with 2^n pointers:\n");
        dump_zap_histogram(zs.zs_leafs_with_2n_pointers);

        (void) printf("\t\tBlocks with n*5 entries:\n");
        dump_zap_histogram(zs.zs_blocks_with_n5_entries);

        (void) printf("\t\tBlocks n/10 full:\n");
        dump_zap_histogram(zs.zs_blocks_n_tenths_full);

        (void) printf("\t\tEntries with n chunks:\n");
        dump_zap_histogram(zs.zs_entries_using_n_chunks);

        (void) printf("\t\tBuckets with n entries:\n");
        dump_zap_histogram(zs.zs_buckets_with_n_entries);
}

/*ARGSUSED*/
static void
dump_none(objset_t *os, uint64_t object, void *data, size_t size)
{
}

/*ARGSUSED*/
static void
dump_unknown(objset_t *os, uint64_t object, void *data, size_t size)
{
        (void) printf("\tUNKNOWN OBJECT TYPE\n");
}

/*ARGSUSED*/
void
dump_uint8(objset_t *os, uint64_t object, void *data, size_t size)
{
}

/*ARGSUSED*/
static void
dump_uint64(objset_t *os, uint64_t object, void *data, size_t size)
{
}

/*ARGSUSED*/
static void
dump_zap(objset_t *os, uint64_t object, void *data, size_t size)
{
        zap_cursor_t zc;
        zap_attribute_t attr;
        void *prop;
        int i;

        dump_zap_stats(os, object);
        (void) printf("\n");

        for (zap_cursor_init(&zc, os, object);
            zap_cursor_retrieve(&zc, &attr) == 0;
            zap_cursor_advance(&zc)) {
                (void) printf("\t\t%s = ", attr.za_name);
                if (attr.za_num_integers == 0) {
                        (void) printf("\n");
                        continue;
                }
                prop = umem_zalloc(attr.za_num_integers *
                    attr.za_integer_length, UMEM_NOFAIL);
                (void) zap_lookup(os, object, attr.za_name,
                    attr.za_integer_length, attr.za_num_integers, prop);
                if (attr.za_integer_length == 1) {
                        (void) printf("%s", (char *)prop);
                } else {
                        for (i = 0; i < attr.za_num_integers; i++) {
                                switch (attr.za_integer_length) {
                                case 2:
                                        (void) printf("%u ",
                                            ((uint16_t *)prop)[i]);
                                        break;
                                case 4:
                                        (void) printf("%u ",
                                            ((uint32_t *)prop)[i]);
                                        break;
                                case 8:
                                        (void) printf("%lld ",
                                            (u_longlong_t)((int64_t *)prop)[i]);
                                        break;
                                }
                        }
                }
                (void) printf("\n");
                umem_free(prop, attr.za_num_integers * attr.za_integer_length);
        }
        zap_cursor_fini(&zc);
}

/*ARGSUSED*/
static void
dump_ddt_zap(objset_t *os, uint64_t object, void *data, size_t size)
{
        dump_zap_stats(os, object);
        /* contents are printed elsewhere, properly decoded */
}

/*ARGSUSED*/
static void
dump_sa_attrs(objset_t *os, uint64_t object, void *data, size_t size)
{
        zap_cursor_t zc;
        zap_attribute_t attr;

        dump_zap_stats(os, object);
        (void) printf("\n");

        for (zap_cursor_init(&zc, os, object);
            zap_cursor_retrieve(&zc, &attr) == 0;
            zap_cursor_advance(&zc)) {
                (void) printf("\t\t%s = ", attr.za_name);
                if (attr.za_num_integers == 0) {
                        (void) printf("\n");
                        continue;
                }
                (void) printf(" %llx : [%d:%d:%d]\n",
                    (u_longlong_t)attr.za_first_integer,
                    (int)ATTR_LENGTH(attr.za_first_integer),
                    (int)ATTR_BSWAP(attr.za_first_integer),
                    (int)ATTR_NUM(attr.za_first_integer));
        }
        zap_cursor_fini(&zc);
}

/*ARGSUSED*/
static void
dump_sa_layouts(objset_t *os, uint64_t object, void *data, size_t size)
{
        zap_cursor_t zc;
        zap_attribute_t attr;
        uint16_t *layout_attrs;
        int i;

        dump_zap_stats(os, object);
        (void) printf("\n");

        for (zap_cursor_init(&zc, os, object);
            zap_cursor_retrieve(&zc, &attr) == 0;
            zap_cursor_advance(&zc)) {
                (void) printf("\t\t%s = [", attr.za_name);
                if (attr.za_num_integers == 0) {
                        (void) printf("\n");
                        continue;
                }

                VERIFY(attr.za_integer_length == 2);
                layout_attrs = umem_zalloc(attr.za_num_integers *
                    attr.za_integer_length, UMEM_NOFAIL);

                VERIFY(zap_lookup(os, object, attr.za_name,
                    attr.za_integer_length,
                    attr.za_num_integers, layout_attrs) == 0);

                for (i = 0; i != attr.za_num_integers; i++)
                        (void) printf(" %d ", (int)layout_attrs[i]);
                (void) printf("]\n");
                umem_free(layout_attrs,
                    attr.za_num_integers * attr.za_integer_length);
        }
        zap_cursor_fini(&zc);
}

/*ARGSUSED*/
static void
dump_zpldir(objset_t *os, uint64_t object, void *data, size_t size)
{
        zap_cursor_t zc;
        zap_attribute_t attr;
        const char *typenames[] = {
                /* 0 */ "not specified",
                /* 1 */ "FIFO",
                /* 2 */ "Character Device",
                /* 3 */ "3 (invalid)",
                /* 4 */ "Directory",
                /* 5 */ "5 (invalid)",
                /* 6 */ "Block Device",
                /* 7 */ "7 (invalid)",
                /* 8 */ "Regular File",
                /* 9 */ "9 (invalid)",
                /* 10 */ "Symbolic Link",
                /* 11 */ "11 (invalid)",
                /* 12 */ "Socket",
                /* 13 */ "Door",
                /* 14 */ "Event Port",
                /* 15 */ "15 (invalid)",
        };

        dump_zap_stats(os, object);
        (void) printf("\n");

        for (zap_cursor_init(&zc, os, object);
            zap_cursor_retrieve(&zc, &attr) == 0;
            zap_cursor_advance(&zc)) {
                (void) printf("\t\t%s = %lld (type: %s)\n",
                    attr.za_name, ZFS_DIRENT_OBJ(attr.za_first_integer),
                    typenames[ZFS_DIRENT_TYPE(attr.za_first_integer)]);
        }
        zap_cursor_fini(&zc);
}

static void
dump_spacemap(objset_t *os, space_map_obj_t *smo, space_map_t *sm)
{
        uint64_t alloc, offset, entry;
        uint8_t mapshift = sm->sm_shift;
        uint64_t mapstart = sm->sm_start;
        char *ddata[] = { "ALLOC", "FREE", "CONDENSE", "INVALID",
                            "INVALID", "INVALID", "INVALID", "INVALID" };

        if (smo->smo_object == 0)
                return;

        /*
         * Print out the freelist entries in both encoded and decoded form.
         */
        alloc = 0;
        for (offset = 0; offset < smo->smo_objsize; offset += sizeof (entry)) {
                VERIFY3U(0, ==, dmu_read(os, smo->smo_object, offset,
                    sizeof (entry), &entry, DMU_READ_PREFETCH));
                if (SM_DEBUG_DECODE(entry)) {
                        (void) printf("\t    [%6llu] %s: txg %llu, pass %llu\n",
                            (u_longlong_t)(offset / sizeof (entry)),
                            ddata[SM_DEBUG_ACTION_DECODE(entry)],
                            (u_longlong_t)SM_DEBUG_TXG_DECODE(entry),
                            (u_longlong_t)SM_DEBUG_SYNCPASS_DECODE(entry));
                } else {
                        (void) printf("\t    [%6llu]    %c  range:"
                            " %010llx-%010llx  size: %06llx\n",
                            (u_longlong_t)(offset / sizeof (entry)),
                            SM_TYPE_DECODE(entry) == SM_ALLOC ? 'A' : 'F',
                            (u_longlong_t)((SM_OFFSET_DECODE(entry) <<
                            mapshift) + mapstart),
                            (u_longlong_t)((SM_OFFSET_DECODE(entry) <<
                            mapshift) + mapstart + (SM_RUN_DECODE(entry) <<
                            mapshift)),
                            (u_longlong_t)(SM_RUN_DECODE(entry) << mapshift));
                        if (SM_TYPE_DECODE(entry) == SM_ALLOC)
                                alloc += SM_RUN_DECODE(entry) << mapshift;
                        else
                                alloc -= SM_RUN_DECODE(entry) << mapshift;
                }
        }
        if (alloc != smo->smo_alloc) {
                (void) printf("space_map_object alloc (%llu) INCONSISTENT "
                    "with space map summary (%llu)\n",
                    (u_longlong_t)smo->smo_alloc, (u_longlong_t)alloc);
        }
}

static void
dump_metaslab_stats(metaslab_t *msp)
{
        char maxbuf[32];
        space_map_t *sm = msp->ms_map;
        avl_tree_t *t = sm->sm_pp_root;
        int free_pct = sm->sm_space * 100 / sm->sm_size;

        zdb_nicenum(space_map_maxsize(sm), maxbuf);

        (void) printf("\t %25s %10lu   %7s  %6s   %4s %4d%%\n",
            "segments", avl_numnodes(t), "maxsize", maxbuf,
            "freepct", free_pct);
}

static void
dump_metaslab(metaslab_t *msp)
{
        vdev_t *vd = msp->ms_group->mg_vd;
        spa_t *spa = vd->vdev_spa;
        space_map_t *sm = msp->ms_map;
        space_map_obj_t *smo = &msp->ms_smo;
        char freebuf[32];

        zdb_nicenum(sm->sm_size - smo->smo_alloc, freebuf);

        (void) printf(
            "\tmetaslab %6llu   offset %12llx   spacemap %6llu   free    %5s\n",
            (u_longlong_t)(sm->sm_start / sm->sm_size),
            (u_longlong_t)sm->sm_start, (u_longlong_t)smo->smo_object, freebuf);

        if (dump_opt['m'] > 1 && !dump_opt['L']) {
                mutex_enter(&msp->ms_lock);
                space_map_load_wait(sm);
                if (!sm->sm_loaded)
                        VERIFY(space_map_load(sm, zfs_metaslab_ops,
                            SM_FREE, smo, spa->spa_meta_objset) == 0);
                dump_metaslab_stats(msp);
                space_map_unload(sm);
                mutex_exit(&msp->ms_lock);
        }

        if (dump_opt['d'] > 5 || dump_opt['m'] > 2) {
                ASSERT(sm->sm_size == (1ULL << vd->vdev_ms_shift));

                mutex_enter(&msp->ms_lock);
                dump_spacemap(spa->spa_meta_objset, smo, sm);
                mutex_exit(&msp->ms_lock);
        }
}

static void
print_vdev_metaslab_header(vdev_t *vd)
{
        (void) printf("\tvdev %10llu\n\t%-10s%5llu   %-19s   %-15s   %-10s\n",
            (u_longlong_t)vd->vdev_id,
            "metaslabs", (u_longlong_t)vd->vdev_ms_count,
            "offset", "spacemap", "free");
        (void) printf("\t%15s   %19s   %15s   %10s\n",
            "---------------", "-------------------",
            "---------------", "-------------");
}

static void
dump_metaslabs(spa_t *spa)
{
        vdev_t *vd, *rvd = spa->spa_root_vdev;
        uint64_t m, c = 0, children = rvd->vdev_children;

        (void) printf("\nMetaslabs:\n");

        if (!dump_opt['d'] && zopt_objects > 0) {
                c = zopt_object[0];

                if (c >= children)
                        (void) fatal("bad vdev id: %llu", (u_longlong_t)c);

                if (zopt_objects > 1) {
                        vd = rvd->vdev_child[c];
                        print_vdev_metaslab_header(vd);

                        for (m = 1; m < zopt_objects; m++) {
                                if (zopt_object[m] < vd->vdev_ms_count)
                                        dump_metaslab(
                                            vd->vdev_ms[zopt_object[m]]);
                                else
                                        (void) fprintf(stderr, "bad metaslab "
                                            "number %llu\n",
                                            (u_longlong_t)zopt_object[m]);
                        }
                        (void) printf("\n");
                        return;
                }
                children = c + 1;
        }
        for (; c < children; c++) {
                vd = rvd->vdev_child[c];
                print_vdev_metaslab_header(vd);

                for (m = 0; m < vd->vdev_ms_count; m++)
                        dump_metaslab(vd->vdev_ms[m]);
                (void) printf("\n");
        }
}

static void
dump_dde(const ddt_t *ddt, const ddt_entry_t *dde, uint64_t index)
{
        const ddt_phys_t *ddp = dde->dde_phys;
        const ddt_key_t *ddk = &dde->dde_key;
        char *types[4] = { "ditto", "single", "double", "triple" };
        char blkbuf[BP_SPRINTF_LEN];
        blkptr_t blk;
        int p;

        for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
                if (ddp->ddp_phys_birth == 0)
                        continue;
                ddt_bp_create(ddt->ddt_checksum, ddk, ddp, &blk);
                sprintf_blkptr(blkbuf, &blk);
                (void) printf("index %llx refcnt %llu %s %s\n",
                    (u_longlong_t)index, (u_longlong_t)ddp->ddp_refcnt,
                    types[p], blkbuf);
        }
}

static void
dump_dedup_ratio(const ddt_stat_t *dds)
{
        double rL, rP, rD, D, dedup, compress, copies;

        if (dds->dds_blocks == 0)
                return;

        rL = (double)dds->dds_ref_lsize;
        rP = (double)dds->dds_ref_psize;
        rD = (double)dds->dds_ref_dsize;
        D = (double)dds->dds_dsize;

        dedup = rD / D;
        compress = rL / rP;
        copies = rD / rP;

        (void) printf("dedup = %.2f, compress = %.2f, copies = %.2f, "
            "dedup * compress / copies = %.2f\n\n",
            dedup, compress, copies, dedup * compress / copies);
}

static void
dump_ddt(ddt_t *ddt, enum ddt_type type, enum ddt_class class)
{
        char name[DDT_NAMELEN];
        ddt_entry_t dde;
        uint64_t walk = 0;
        dmu_object_info_t doi;
        uint64_t count, dspace, mspace;
        int error;

        error = ddt_object_info(ddt, type, class, &doi);

        if (error == ENOENT)
                return;
        ASSERT(error == 0);

        error = ddt_object_count(ddt, type, class, &count);
        ASSERT(error == 0);
        if (count == 0)
                return;

        dspace = doi.doi_physical_blocks_512 << 9;
        mspace = doi.doi_fill_count * doi.doi_data_block_size;

        ddt_object_name(ddt, type, class, name);

        (void) printf("%s: %llu entries, size %llu on disk, %llu in core\n",
            name,
            (u_longlong_t)count,
            (u_longlong_t)(dspace / count),
            (u_longlong_t)(mspace / count));

        if (dump_opt['D'] < 3)
                return;

        zpool_dump_ddt(NULL, &ddt->ddt_histogram[type][class]);

        if (dump_opt['D'] < 4)
                return;

        if (dump_opt['D'] < 5 && class == DDT_CLASS_UNIQUE)
                return;

        (void) printf("%s contents:\n\n", name);

        while ((error = ddt_object_walk(ddt, type, class, &walk, &dde)) == 0)
                dump_dde(ddt, &dde, walk);

        ASSERT(error == ENOENT);

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

static void
dump_all_ddts(spa_t *spa)
{
        ddt_histogram_t ddh_total;
        ddt_stat_t dds_total;
        enum zio_checksum c;
        enum ddt_type type;
        enum ddt_class class;

        bzero(&ddh_total, sizeof (ddt_histogram_t));
        bzero(&dds_total, sizeof (ddt_stat_t));

        for (c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
                ddt_t *ddt = spa->spa_ddt[c];
                for (type = 0; type < DDT_TYPES; type++) {
                        for (class = 0; class < DDT_CLASSES;
                            class++) {
                                dump_ddt(ddt, type, class);
                        }
                }
        }

        ddt_get_dedup_stats(spa, &dds_total);

        if (dds_total.dds_blocks == 0) {
                (void) printf("All DDTs are empty\n");
                return;
        }

        (void) printf("\n");

        if (dump_opt['D'] > 1) {
                (void) printf("DDT histogram (aggregated over all DDTs):\n");
                ddt_get_dedup_histogram(spa, &ddh_total);
                zpool_dump_ddt(&dds_total, &ddh_total);
        }

        dump_dedup_ratio(&dds_total);
}

static void
dump_dtl_seg(space_map_t *sm, uint64_t start, uint64_t size)
{
        char *prefix = (void *)sm;

        (void) printf("%s [%llu,%llu) length %llu\n",
            prefix,
            (u_longlong_t)start,
            (u_longlong_t)(start + size),
            (u_longlong_t)(size));
}

static void
dump_dtl(vdev_t *vd, int indent)
{
        spa_t *spa = vd->vdev_spa;
        boolean_t required;
        char *name[DTL_TYPES] = { "missing", "partial", "scrub", "outage" };
        char prefix[256];
        int c, t;

        spa_vdev_state_enter(spa, SCL_NONE);
        required = vdev_dtl_required(vd);
        (void) spa_vdev_state_exit(spa, NULL, 0);

        if (indent == 0)
                (void) printf("\nDirty time logs:\n\n");

        (void) printf("\t%*s%s [%s]\n", indent, "",
            vd->vdev_path ? vd->vdev_path :
            vd->vdev_parent ? vd->vdev_ops->vdev_op_type : spa_name(spa),
            required ? "DTL-required" : "DTL-expendable");

        for (t = 0; t < DTL_TYPES; t++) {
                space_map_t *sm = &vd->vdev_dtl[t];
                if (sm->sm_space == 0)
                        continue;
                (void) snprintf(prefix, sizeof (prefix), "\t%*s%s",
                    indent + 2, "", name[t]);
                mutex_enter(sm->sm_lock);
                space_map_walk(sm, dump_dtl_seg, (void *)prefix);
                mutex_exit(sm->sm_lock);
                if (dump_opt['d'] > 5 && vd->vdev_children == 0)
                        dump_spacemap(spa->spa_meta_objset,
                            &vd->vdev_dtl_smo, sm);
        }

        for (c = 0; c < vd->vdev_children; c++)
                dump_dtl(vd->vdev_child[c], indent + 4);
}

static void
dump_history(spa_t *spa)
{
        nvlist_t **events = NULL;
        char buf[SPA_MAXBLOCKSIZE];
        uint64_t resid, len, off = 0;
        uint_t num = 0;
        int error;
        time_t tsec;
        struct tm t;
        char tbuf[30];
        char internalstr[MAXPATHLEN];
        int i;

        do {
                len = sizeof (buf);

                if ((error = spa_history_get(spa, &off, &len, buf)) != 0) {
                        (void) fprintf(stderr, "Unable to read history: "
                            "error %d\n", error);
                        return;
                }

                if (zpool_history_unpack(buf, len, &resid, &events, &num) != 0)
                        break;

                off -= resid;
        } while (len != 0);

        (void) printf("\nHistory:\n");
        for (i = 0; i < num; i++) {
                uint64_t time, txg, ievent;
                char *cmd, *intstr;
                boolean_t printed = B_FALSE;

                if (nvlist_lookup_uint64(events[i], ZPOOL_HIST_TIME,
                    &time) != 0)
                        goto next;
                if (nvlist_lookup_string(events[i], ZPOOL_HIST_CMD,
                    &cmd) != 0) {
                        if (nvlist_lookup_uint64(events[i],
                            ZPOOL_HIST_INT_EVENT, &ievent) != 0)
                                goto next;
                        verify(nvlist_lookup_uint64(events[i],
                            ZPOOL_HIST_TXG, &txg) == 0);
                        verify(nvlist_lookup_string(events[i],
                            ZPOOL_HIST_INT_STR, &intstr) == 0);
                        if (ievent >= ZFS_NUM_LEGACY_HISTORY_EVENTS)
                                goto next;

                        (void) snprintf(internalstr,
                            sizeof (internalstr),
                            "[internal %s txg:%lld] %s",
                            zfs_history_event_names[ievent],
                            (longlong_t)txg, intstr);
                        cmd = internalstr;
                }
                tsec = time;
                (void) localtime_r(&tsec, &t);
                (void) strftime(tbuf, sizeof (tbuf), "%F.%T", &t);
                (void) printf("%s %s\n", tbuf, cmd);
                printed = B_TRUE;

next:
                if (dump_opt['h'] > 1) {
                        if (!printed)
                                (void) printf("unrecognized record:\n");
                        dump_nvlist(events[i], 2);
                }
        }
}

/*ARGSUSED*/
static void
dump_dnode(objset_t *os, uint64_t object, void *data, size_t size)
{
}

static uint64_t
blkid2offset(const dnode_phys_t *dnp, const blkptr_t *bp, const zbookmark_t *zb)
{
        if (dnp == NULL) {
                ASSERT(zb->zb_level < 0);
                if (zb->zb_object == 0)
                        return (zb->zb_blkid);
                return (zb->zb_blkid * BP_GET_LSIZE(bp));
        }

        ASSERT(zb->zb_level >= 0);

        return ((zb->zb_blkid <<
            (zb->zb_level * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT))) *
            dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);
}

static void
sprintf_blkptr_compact(char *blkbuf, const blkptr_t *bp)
{
        const dva_t *dva = bp->blk_dva;
        int ndvas = dump_opt['d'] > 5 ? BP_GET_NDVAS(bp) : 1;
        int i;

        if (dump_opt['b'] >= 5) {
                sprintf_blkptr(blkbuf, bp);
                return;
        }

        blkbuf[0] = '\0';

        for (i = 0; i < ndvas; i++)
                (void) sprintf(blkbuf + strlen(blkbuf), "%llu:%llx:%llx ",
                    (u_longlong_t)DVA_GET_VDEV(&dva[i]),
                    (u_longlong_t)DVA_GET_OFFSET(&dva[i]),
                    (u_longlong_t)DVA_GET_ASIZE(&dva[i]));

        (void) sprintf(blkbuf + strlen(blkbuf),
            "%llxL/%llxP F=%llu B=%llu/%llu",
            (u_longlong_t)BP_GET_LSIZE(bp),
            (u_longlong_t)BP_GET_PSIZE(bp),
            (u_longlong_t)bp->blk_fill,
            (u_longlong_t)bp->blk_birth,
            (u_longlong_t)BP_PHYSICAL_BIRTH(bp));
}

static void
print_indirect(blkptr_t *bp, const zbookmark_t *zb,
    const dnode_phys_t *dnp)
{
        char blkbuf[BP_SPRINTF_LEN];
        int l;

        ASSERT3U(BP_GET_TYPE(bp), ==, dnp->dn_type);
        ASSERT3U(BP_GET_LEVEL(bp), ==, zb->zb_level);

        (void) printf("%16llx ", (u_longlong_t)blkid2offset(dnp, bp, zb));

        ASSERT(zb->zb_level >= 0);

        for (l = dnp->dn_nlevels - 1; l >= -1; l--) {
                if (l == zb->zb_level) {
                        (void) printf("L%llx", (u_longlong_t)zb->zb_level);
                } else {
                        (void) printf(" ");
                }
        }

        sprintf_blkptr_compact(blkbuf, bp);
        (void) printf("%s\n", blkbuf);
}

static int
visit_indirect(spa_t *spa, const dnode_phys_t *dnp,
    blkptr_t *bp, const zbookmark_t *zb)
{
        int err = 0;

        if (bp->blk_birth == 0)
                return (0);

        print_indirect(bp, zb, dnp);

        if (BP_GET_LEVEL(bp) > 0) {
                uint32_t flags = ARC_WAIT;
                int i;
                blkptr_t *cbp;
                int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
                arc_buf_t *buf;
                uint64_t fill = 0;

                err = arc_read(NULL, spa, bp, arc_getbuf_func, &buf,
                    ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
                if (err)
                        return (err);
                ASSERT(buf->b_data);

                /* recursively visit blocks below this */
                cbp = buf->b_data;
                for (i = 0; i < epb; i++, cbp++) {
                        zbookmark_t czb;

                        SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object,
                            zb->zb_level - 1,
                            zb->zb_blkid * epb + i);
                        err = visit_indirect(spa, dnp, cbp, &czb);
                        if (err)
                                break;
                        fill += cbp->blk_fill;
                }
                if (!err)
                        ASSERT3U(fill, ==, bp->blk_fill);
                (void) arc_buf_remove_ref(buf, &buf);
        }

        return (err);
}

/*ARGSUSED*/
static void
dump_indirect(dnode_t *dn)
{
        dnode_phys_t *dnp = dn->dn_phys;
        int j;
        zbookmark_t czb;

        (void) printf("Indirect blocks:\n");

        SET_BOOKMARK(&czb, dmu_objset_id(dn->dn_objset),
            dn->dn_object, dnp->dn_nlevels - 1, 0);
        for (j = 0; j < dnp->dn_nblkptr; j++) {
                czb.zb_blkid = j;
                (void) visit_indirect(dmu_objset_spa(dn->dn_objset), dnp,
                    &dnp->dn_blkptr[j], &czb);
        }

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

/*ARGSUSED*/
static void
dump_dsl_dir(objset_t *os, uint64_t object, void *data, size_t size)
{
        dsl_dir_phys_t *dd = data;
        time_t crtime;
        char nice[32];

        if (dd == NULL)
                return;

        ASSERT3U(size, >=, sizeof (dsl_dir_phys_t));

        crtime = dd->dd_creation_time;
        (void) printf("\t\tcreation_time = %s", ctime(&crtime));
        (void) printf("\t\thead_dataset_obj = %llu\n",
            (u_longlong_t)dd->dd_head_dataset_obj);
        (void) printf("\t\tparent_dir_obj = %llu\n",
            (u_longlong_t)dd->dd_parent_obj);
        (void) printf("\t\torigin_obj = %llu\n",
            (u_longlong_t)dd->dd_origin_obj);
        (void) printf("\t\tchild_dir_zapobj = %llu\n",
            (u_longlong_t)dd->dd_child_dir_zapobj);
        zdb_nicenum(dd->dd_used_bytes, nice);
        (void) printf("\t\tused_bytes = %s\n", nice);
        zdb_nicenum(dd->dd_compressed_bytes, nice);
        (void) printf("\t\tcompressed_bytes = %s\n", nice);
        zdb_nicenum(dd->dd_uncompressed_bytes, nice);
        (void) printf("\t\tuncompressed_bytes = %s\n", nice);
        zdb_nicenum(dd->dd_quota, nice);
        (void) printf("\t\tquota = %s\n", nice);
        zdb_nicenum(dd->dd_reserved, nice);
        (void) printf("\t\treserved = %s\n", nice);
        (void) printf("\t\tprops_zapobj = %llu\n",
            (u_longlong_t)dd->dd_props_zapobj);
        (void) printf("\t\tdeleg_zapobj = %llu\n",
            (u_longlong_t)dd->dd_deleg_zapobj);
        (void) printf("\t\tflags = %llx\n",
            (u_longlong_t)dd->dd_flags);

#define DO(which) \
        zdb_nicenum(dd->dd_used_breakdown[DD_USED_ ## which], nice); \
        (void) printf("\t\tused_breakdown[" #which "] = %s\n", nice)
        DO(HEAD);
        DO(SNAP);
        DO(CHILD);
        DO(CHILD_RSRV);
        DO(REFRSRV);
#undef DO
}

/*ARGSUSED*/
static void
dump_dsl_dataset(objset_t *os, uint64_t object, void *data, size_t size)
{
        dsl_dataset_phys_t *ds = data;
        time_t crtime;
        char used[32], compressed[32], uncompressed[32], unique[32];
        char blkbuf[BP_SPRINTF_LEN];

        if (ds == NULL)
                return;

        ASSERT(size == sizeof (*ds));
        crtime = ds->ds_creation_time;
        zdb_nicenum(ds->ds_referenced_bytes, used);
        zdb_nicenum(ds->ds_compressed_bytes, compressed);
        zdb_nicenum(ds->ds_uncompressed_bytes, uncompressed);
        zdb_nicenum(ds->ds_unique_bytes, unique);
        sprintf_blkptr(blkbuf, &ds->ds_bp);

        (void) printf("\t\tdir_obj = %llu\n",
            (u_longlong_t)ds->ds_dir_obj);
        (void) printf("\t\tprev_snap_obj = %llu\n",
            (u_longlong_t)ds->ds_prev_snap_obj);
        (void) printf("\t\tprev_snap_txg = %llu\n",
            (u_longlong_t)ds->ds_prev_snap_txg);
        (void) printf("\t\tnext_snap_obj = %llu\n",
            (u_longlong_t)ds->ds_next_snap_obj);
        (void) printf("\t\tsnapnames_zapobj = %llu\n",
            (u_longlong_t)ds->ds_snapnames_zapobj);
        (void) printf("\t\tnum_children = %llu\n",
            (u_longlong_t)ds->ds_num_children);
        (void) printf("\t\tuserrefs_obj = %llu\n",
            (u_longlong_t)ds->ds_userrefs_obj);
        (void) printf("\t\tcreation_time = %s", ctime(&crtime));
        (void) printf("\t\tcreation_txg = %llu\n",
            (u_longlong_t)ds->ds_creation_txg);
        (void) printf("\t\tdeadlist_obj = %llu\n",
            (u_longlong_t)ds->ds_deadlist_obj);
        (void) printf("\t\tused_bytes = %s\n", used);
        (void) printf("\t\tcompressed_bytes = %s\n", compressed);
        (void) printf("\t\tuncompressed_bytes = %s\n", uncompressed);
        (void) printf("\t\tunique = %s\n", unique);
        (void) printf("\t\tfsid_guid = %llu\n",
            (u_longlong_t)ds->ds_fsid_guid);
        (void) printf("\t\tguid = %llu\n",
            (u_longlong_t)ds->ds_guid);
        (void) printf("\t\tflags = %llx\n",
            (u_longlong_t)ds->ds_flags);
        (void) printf("\t\tnext_clones_obj = %llu\n",
            (u_longlong_t)ds->ds_next_clones_obj);
        (void) printf("\t\tprops_obj = %llu\n",
            (u_longlong_t)ds->ds_props_obj);
        (void) printf("\t\tbp = %s\n", blkbuf);
}

/* ARGSUSED */
static int
dump_bptree_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
{
        char blkbuf[BP_SPRINTF_LEN];

        if (bp->blk_birth != 0) {
                sprintf_blkptr(blkbuf, bp);
                (void) printf("\t%s\n", blkbuf);
        }
        return (0);
}

static void
dump_bptree(objset_t *os, uint64_t obj, char *name)
{
        char bytes[32];
        bptree_phys_t *bt;
        dmu_buf_t *db;

        if (dump_opt['d'] < 3)
                return;

        VERIFY3U(0, ==, dmu_bonus_hold(os, obj, FTAG, &db));
        bt = db->db_data;
        zdb_nicenum(bt->bt_bytes, bytes);
        (void) printf("\n    %s: %llu datasets, %s\n",
            name, (unsigned long long)(bt->bt_end - bt->bt_begin), bytes);
        dmu_buf_rele(db, FTAG);

        if (dump_opt['d'] < 5)
                return;

        (void) printf("\n");

        (void) bptree_iterate(os, obj, B_FALSE, dump_bptree_cb, NULL, NULL);
}

/* ARGSUSED */
static int
dump_bpobj_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
{
        char blkbuf[BP_SPRINTF_LEN];

        ASSERT(bp->blk_birth != 0);
        sprintf_blkptr_compact(blkbuf, bp);
        (void) printf("\t%s\n", blkbuf);
        return (0);
}

static void
dump_bpobj(bpobj_t *bpo, char *name, int indent)
{
        char bytes[32];
        char comp[32];
        char uncomp[32];
        uint64_t i;

        if (dump_opt['d'] < 3)
                return;

        zdb_nicenum(bpo->bpo_phys->bpo_bytes, bytes);
        if (bpo->bpo_havesubobj && bpo->bpo_phys->bpo_subobjs != 0) {
                zdb_nicenum(bpo->bpo_phys->bpo_comp, comp);
                zdb_nicenum(bpo->bpo_phys->bpo_uncomp, uncomp);
                (void) printf("    %*s: object %llu, %llu local blkptrs, "
                    "%llu subobjs, %s (%s/%s comp)\n",
                    indent * 8, name,
                    (u_longlong_t)bpo->bpo_object,
                    (u_longlong_t)bpo->bpo_phys->bpo_num_blkptrs,
                    (u_longlong_t)bpo->bpo_phys->bpo_num_subobjs,
                    bytes, comp, uncomp);

                for (i = 0; i < bpo->bpo_phys->bpo_num_subobjs; i++) {
                        uint64_t subobj;
                        bpobj_t subbpo;
                        int error;
                        VERIFY0(dmu_read(bpo->bpo_os,
                            bpo->bpo_phys->bpo_subobjs,
                            i * sizeof (subobj), sizeof (subobj), &subobj, 0));
                        error = bpobj_open(&subbpo, bpo->bpo_os, subobj);
                        if (error != 0) {
                                (void) printf("ERROR %u while trying to open "
                                    "subobj id %llu\n",
                                    error, (u_longlong_t)subobj);
                                continue;
                        }
                        dump_bpobj(&subbpo, "subobj", indent + 1);
                }
        } else {
                (void) printf("    %*s: object %llu, %llu blkptrs, %s\n",
                    indent * 8, name,
                    (u_longlong_t)bpo->bpo_object,
                    (u_longlong_t)bpo->bpo_phys->bpo_num_blkptrs,
                    bytes);
        }

        if (dump_opt['d'] < 5)
                return;


        if (indent == 0) {
                (void) bpobj_iterate_nofree(bpo, dump_bpobj_cb, NULL, NULL);
                (void) printf("\n");
        }
}

static void
dump_deadlist(dsl_deadlist_t *dl)
{
        dsl_deadlist_entry_t *dle;
        uint64_t unused;
        char bytes[32];
        char comp[32];
        char uncomp[32];

        if (dump_opt['d'] < 3)
                return;

        zdb_nicenum(dl->dl_phys->dl_used, bytes);
        zdb_nicenum(dl->dl_phys->dl_comp, comp);
        zdb_nicenum(dl->dl_phys->dl_uncomp, uncomp);
        (void) printf("\n    Deadlist: %s (%s/%s comp)\n",
            bytes, comp, uncomp);

        if (dump_opt['d'] < 4)
                return;

        (void) printf("\n");

        /* force the tree to be loaded */
        dsl_deadlist_space_range(dl, 0, UINT64_MAX, &unused, &unused, &unused);

        for (dle = avl_first(&dl->dl_tree); dle;
            dle = AVL_NEXT(&dl->dl_tree, dle)) {
                if (dump_opt['d'] >= 5) {
                        char buf[128];
                        (void) snprintf(buf, sizeof (buf), "mintxg %llu -> obj %llu",
                            (longlong_t)dle->dle_mintxg,
                            (longlong_t)dle->dle_bpobj.bpo_object);

                        dump_bpobj(&dle->dle_bpobj, buf, 0);
                } else {
                        (void) printf("mintxg %llu -> obj %llu\n",
                            (longlong_t)dle->dle_mintxg,
                            (longlong_t)dle->dle_bpobj.bpo_object);

                }
        }
}

static avl_tree_t idx_tree;
static avl_tree_t domain_tree;
static boolean_t fuid_table_loaded;
static boolean_t sa_loaded;
sa_attr_type_t *sa_attr_table;

static void
fuid_table_destroy(void)
{
        if (fuid_table_loaded) {
                zfs_fuid_table_destroy(&idx_tree, &domain_tree);
                fuid_table_loaded = B_FALSE;
        }
}

/*
 * print uid or gid information.
 * For normal POSIX id just the id is printed in decimal format.
 * For CIFS files with FUID the fuid is printed in hex followed by
 * the domain-rid string.
 */
static void
print_idstr(uint64_t id, const char *id_type)
{
        if (FUID_INDEX(id)) {
                char *domain;

                domain = zfs_fuid_idx_domain(&idx_tree, FUID_INDEX(id));
                (void) printf("\t%s     %llx [%s-%d]\n", id_type,
                    (u_longlong_t)id, domain, (int)FUID_RID(id));
        } else {
                (void) printf("\t%s     %llu\n", id_type, (u_longlong_t)id);
        }

}

static void
dump_uidgid(objset_t *os, uint64_t uid, uint64_t gid)
{
        uint32_t uid_idx, gid_idx;

        uid_idx = FUID_INDEX(uid);
        gid_idx = FUID_INDEX(gid);

        /* Load domain table, if not already loaded */
        if (!fuid_table_loaded && (uid_idx || gid_idx)) {
                uint64_t fuid_obj;

                /* first find the fuid object.  It lives in the master node */
                VERIFY(zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES,
                    8, 1, &fuid_obj) == 0);
                zfs_fuid_avl_tree_create(&idx_tree, &domain_tree);
                (void) zfs_fuid_table_load(os, fuid_obj,
                    &idx_tree, &domain_tree);
                fuid_table_loaded = B_TRUE;
        }

        print_idstr(uid, "uid");
        print_idstr(gid, "gid");
}

static void
dump_znode_sa_xattr(sa_handle_t *hdl)
{
        nvlist_t *sa_xattr;
        nvpair_t *elem = NULL;
        int sa_xattr_size = 0;
        int sa_xattr_entries = 0;
        int error;
        char *sa_xattr_packed;

        error = sa_size(hdl, sa_attr_table[ZPL_DXATTR], &sa_xattr_size);
        if (error || sa_xattr_size == 0)
                return;

        sa_xattr_packed = malloc(sa_xattr_size);
        if (sa_xattr_packed == NULL)
                return;

        error = sa_lookup(hdl, sa_attr_table[ZPL_DXATTR],
            sa_xattr_packed, sa_xattr_size);
        if (error) {
                free(sa_xattr_packed);
                return;
        }

        error = nvlist_unpack(sa_xattr_packed, sa_xattr_size, &sa_xattr, 0);
        if (error) {
                free(sa_xattr_packed);
                return;
        }

        while ((elem = nvlist_next_nvpair(sa_xattr, elem)) != NULL)
                sa_xattr_entries++;

        (void) printf("\tSA xattrs: %d bytes, %d entries\n\n",
            sa_xattr_size, sa_xattr_entries);
        while ((elem = nvlist_next_nvpair(sa_xattr, elem)) != NULL) {
                uchar_t *value;
                uint_t cnt, idx;

                (void) printf("\t\t%s = ", nvpair_name(elem));
                nvpair_value_byte_array(elem, &value, &cnt);
                for (idx = 0 ; idx < cnt ; ++idx) {
                        if (isprint(value[idx]))
                                (void) putchar(value[idx]);
                        else
                                (void) printf("\\%3.3o", value[idx]);
                }
                (void) putchar('\n');
        }

        nvlist_free(sa_xattr);
        free(sa_xattr_packed);
}

/*ARGSUSED*/
static void
dump_znode(objset_t *os, uint64_t object, void *data, size_t size)
{
        char path[MAXPATHLEN * 2];      /* allow for xattr and failure prefix */
        sa_handle_t *hdl;
        uint64_t xattr, rdev, gen;
        uint64_t uid, gid, mode, fsize, parent, links;
        uint64_t pflags;
        uint64_t acctm[2], modtm[2], chgtm[2], crtm[2];
        time_t z_crtime, z_atime, z_mtime, z_ctime;
        sa_bulk_attr_t bulk[12];
        int idx = 0;
        int error;

        if (!sa_loaded) {
                uint64_t sa_attrs = 0;
                uint64_t version;

                VERIFY(zap_lookup(os, MASTER_NODE_OBJ, ZPL_VERSION_STR,
                    8, 1, &version) == 0);
                if (version >= ZPL_VERSION_SA) {
                        VERIFY(zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS,
                            8, 1, &sa_attrs) == 0);
                }
                if ((error = sa_setup(os, sa_attrs, zfs_attr_table,
                    ZPL_END, &sa_attr_table)) != 0) {
                        (void) printf("sa_setup failed errno %d, can't "
                            "display znode contents\n", error);
                        return;
                }
                sa_loaded = B_TRUE;
        }

        if (sa_handle_get(os, object, NULL, SA_HDL_PRIVATE, &hdl)) {
                (void) printf("Failed to get handle for SA znode\n");
                return;
        }

        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_UID], NULL, &uid, 8);
        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_GID], NULL, &gid, 8);
        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_LINKS], NULL,
            &links, 8);
        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_GEN], NULL, &gen, 8);
        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_MODE], NULL,
            &mode, 8);
        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_PARENT],
            NULL, &parent, 8);
        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_SIZE], NULL,
            &fsize, 8);
        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_ATIME], NULL,
            acctm, 16);
        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_MTIME], NULL,
            modtm, 16);
        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_CRTIME], NULL,
            crtm, 16);
        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_CTIME], NULL,
            chgtm, 16);
        SA_ADD_BULK_ATTR(bulk, idx, sa_attr_table[ZPL_FLAGS], NULL,
            &pflags, 8);

        if (sa_bulk_lookup(hdl, bulk, idx)) {
                (void) sa_handle_destroy(hdl);
                return;
        }

        error = zfs_obj_to_path(os, object, path, sizeof (path));
        if (error != 0) {
                (void) snprintf(path, sizeof (path), "\?\?\?<object#%llu>",
                    (u_longlong_t)object);
        }
        if (dump_opt['d'] < 3) {
                (void) printf("\t%s\n", path);
                (void) sa_handle_destroy(hdl);
                return;
        }

        z_crtime = (time_t)crtm[0];
        z_atime = (time_t)acctm[0];
        z_mtime = (time_t)modtm[0];
        z_ctime = (time_t)chgtm[0];

        (void) printf("\tpath   %s\n", path);
        dump_uidgid(os, uid, gid);
        (void) printf("\tatime  %s", ctime(&z_atime));
        (void) printf("\tmtime  %s", ctime(&z_mtime));
        (void) printf("\tctime  %s", ctime(&z_ctime));
        (void) printf("\tcrtime %s", ctime(&z_crtime));
        (void) printf("\tgen    %llu\n", (u_longlong_t)gen);
        (void) printf("\tmode   %llo\n", (u_longlong_t)mode);
        (void) printf("\tsize   %llu\n", (u_longlong_t)fsize);
        (void) printf("\tparent %llu\n", (u_longlong_t)parent);
        (void) printf("\tlinks  %llu\n", (u_longlong_t)links);
        (void) printf("\tpflags %llx\n", (u_longlong_t)pflags);
        if (sa_lookup(hdl, sa_attr_table[ZPL_XATTR], &xattr,
            sizeof (uint64_t)) == 0)
                (void) printf("\txattr  %llu\n", (u_longlong_t)xattr);
        if (sa_lookup(hdl, sa_attr_table[ZPL_RDEV], &rdev,
            sizeof (uint64_t)) == 0)
                (void) printf("\trdev   0x%016llx\n", (u_longlong_t)rdev);
        dump_znode_sa_xattr(hdl);
        sa_handle_destroy(hdl);
}

/*ARGSUSED*/
static void
dump_acl(objset_t *os, uint64_t object, void *data, size_t size)
{
}

/*ARGSUSED*/
static void
dump_dmu_objset(objset_t *os, uint64_t object, void *data, size_t size)
{
}

static object_viewer_t *object_viewer[DMU_OT_NUMTYPES + 1] = {
        dump_none,              /* unallocated                  */
        dump_zap,               /* object directory             */
        dump_uint64,            /* object array                 */
        dump_none,              /* packed nvlist                */
        dump_packed_nvlist,     /* packed nvlist size           */
        dump_none,              /* bplist                       */
        dump_none,              /* bplist header                */
        dump_none,              /* SPA space map header         */
        dump_none,              /* SPA space map                */
        dump_none,              /* ZIL intent log               */
        dump_dnode,             /* DMU dnode                    */
        dump_dmu_objset,        /* DMU objset                   */
        dump_dsl_dir,           /* DSL directory                */
        dump_zap,               /* DSL directory child map      */
        dump_zap,               /* DSL dataset snap map         */
        dump_zap,               /* DSL props                    */
        dump_dsl_dataset,       /* DSL dataset                  */
        dump_znode,             /* ZFS znode                    */
        dump_acl,               /* ZFS V0 ACL                   */
        dump_uint8,             /* ZFS plain file               */
        dump_zpldir,            /* ZFS directory                */
        dump_zap,               /* ZFS master node              */
        dump_zap,               /* ZFS delete queue             */
        dump_uint8,             /* zvol object                  */
        dump_zap,               /* zvol prop                    */
        dump_uint8,             /* other uint8[]                */
        dump_uint64,            /* other uint64[]               */
        dump_zap,               /* other ZAP                    */
        dump_zap,               /* persistent error log         */
        dump_uint8,             /* SPA history                  */
        dump_history_offsets,   /* SPA history offsets          */
        dump_zap,               /* Pool properties              */
        dump_zap,               /* DSL permissions              */
        dump_acl,               /* ZFS ACL                      */
        dump_uint8,             /* ZFS SYSACL                   */
        dump_none,              /* FUID nvlist                  */
        dump_packed_nvlist,     /* FUID nvlist size             */
        dump_zap,               /* DSL dataset next clones      */
        dump_zap,               /* DSL scrub queue              */
        dump_zap,               /* ZFS user/group used          */
        dump_zap,               /* ZFS user/group quota         */
        dump_zap,               /* snapshot refcount tags       */
        dump_ddt_zap,           /* DDT ZAP object               */
        dump_zap,               /* DDT statistics               */
        dump_znode,             /* SA object                    */
        dump_zap,               /* SA Master Node               */
        dump_sa_attrs,          /* SA attribute registration    */
        dump_sa_layouts,        /* SA attribute layouts         */
        dump_zap,               /* DSL scrub translations       */
        dump_none,              /* fake dedup BP                */
        dump_zap,               /* deadlist                     */
        dump_none,              /* deadlist hdr                 */
        dump_zap,               /* dsl clones                   */
        dump_none,              /* bpobj subobjs                */
        dump_unknown,           /* Unknown type, must be last   */
};

static void
dump_object(objset_t *os, uint64_t object, int verbosity, int *print_header)
{
        dmu_buf_t *db = NULL;
        dmu_object_info_t doi;
        dnode_t *dn;
        void *bonus = NULL;
        size_t bsize = 0;
        char iblk[32], dblk[32], lsize[32], asize[32], fill[32];
        char bonus_size[32];
        char aux[50];
        int error;

        if (*print_header) {
                (void) printf("\n%10s  %3s  %5s  %5s  %5s  %5s  %6s  %s\n",
                    "Object", "lvl", "iblk", "dblk", "dsize", "lsize",
                    "%full", "type");
                *print_header = 0;
        }

        if (object == 0) {
                dn = DMU_META_DNODE(os);
        } else {
                error = dmu_bonus_hold(os, object, FTAG, &db);
                if (error)
                        fatal("dmu_bonus_hold(%llu) failed, errno %u",
                            object, error);
                bonus = db->db_data;
                bsize = db->db_size;
                dn = DB_DNODE((dmu_buf_impl_t *)db);
        }
        dmu_object_info_from_dnode(dn, &doi);

        zdb_nicenum(doi.doi_metadata_block_size, iblk);
        zdb_nicenum(doi.doi_data_block_size, dblk);
        zdb_nicenum(doi.doi_max_offset, lsize);
        zdb_nicenum(doi.doi_physical_blocks_512 << 9, asize);
        zdb_nicenum(doi.doi_bonus_size, bonus_size);
        (void) sprintf(fill, "%6.2f", 100.0 * doi.doi_fill_count *
            doi.doi_data_block_size / (object == 0 ? DNODES_PER_BLOCK : 1) /
            doi.doi_max_offset);

        aux[0] = '\0';

        if (doi.doi_checksum != ZIO_CHECKSUM_INHERIT || verbosity >= 6) {
                (void) snprintf(aux + strlen(aux), sizeof (aux), " (K=%s)",
                    ZDB_CHECKSUM_NAME(doi.doi_checksum));
        }

        if (doi.doi_compress != ZIO_COMPRESS_INHERIT || verbosity >= 6) {
                (void) snprintf(aux + strlen(aux), sizeof (aux), " (Z=%s)",
                    ZDB_COMPRESS_NAME(doi.doi_compress));
        }

        (void) printf("%10lld  %3u  %5s  %5s  %5s  %5s  %6s  %s%s\n",
            (u_longlong_t)object, doi.doi_indirection, iblk, dblk,
            asize, lsize, fill, ZDB_OT_NAME(doi.doi_type), aux);

        if (doi.doi_bonus_type != DMU_OT_NONE && verbosity > 3) {
                (void) printf("%10s  %3s  %5s  %5s  %5s  %5s  %6s  %s\n",
                    "", "", "", "", "", bonus_size, "bonus",
                    ZDB_OT_NAME(doi.doi_bonus_type));
        }

        if (verbosity >= 4) {
                (void) printf("\tdnode flags: %s%s%s\n",
                    (dn->dn_phys->dn_flags & DNODE_FLAG_USED_BYTES) ?
                    "USED_BYTES " : "",
                    (dn->dn_phys->dn_flags & DNODE_FLAG_USERUSED_ACCOUNTED) ?
                    "USERUSED_ACCOUNTED " : "",
                    (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR) ?
                    "SPILL_BLKPTR" : "");
                (void) printf("\tdnode maxblkid: %llu\n",
                    (longlong_t)dn->dn_phys->dn_maxblkid);

                object_viewer[ZDB_OT_TYPE(doi.doi_bonus_type)](os, object,
                    bonus, bsize);
                object_viewer[ZDB_OT_TYPE(doi.doi_type)](os, object, NULL, 0);
                *print_header = 1;
        }

        if (verbosity >= 5)
                dump_indirect(dn);

        if (verbosity >= 5) {
                /*
                 * Report the list of segments that comprise the object.
                 */
                uint64_t start = 0;
                uint64_t end;
                uint64_t blkfill = 1;
                int minlvl = 1;

                if (dn->dn_type == DMU_OT_DNODE) {
                        minlvl = 0;
                        blkfill = DNODES_PER_BLOCK;
                }

                for (;;) {
                        char segsize[32];
                        error = dnode_next_offset(dn,
                            0, &start, minlvl, blkfill, 0);
                        if (error)
                                break;
                        end = start;
                        error = dnode_next_offset(dn,
                            DNODE_FIND_HOLE, &end, minlvl, blkfill, 0);
                        zdb_nicenum(end - start, segsize);
                        (void) printf("\t\tsegment [%016llx, %016llx)"
                            " size %5s\n", (u_longlong_t)start,
                            (u_longlong_t)end, segsize);
                        if (error)
                                break;
                        start = end;
                }
        }

        if (db != NULL)
                dmu_buf_rele(db, FTAG);
}

static char *objset_types[DMU_OST_NUMTYPES] = {
        "NONE", "META", "ZPL", "ZVOL", "OTHER", "ANY" };

static void
dump_dir(objset_t *os)
{
        dmu_objset_stats_t dds;
        uint64_t object, object_count;
        uint64_t refdbytes, usedobjs, scratch;
        char numbuf[32];
        char blkbuf[BP_SPRINTF_LEN + 20];
        char osname[MAXNAMELEN];
        char *type = "UNKNOWN";
        int verbosity = dump_opt['d'];
        int print_header = 1;
        int i, error;

        dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
        dmu_objset_fast_stat(os, &dds);
        dsl_pool_config_exit(dmu_objset_pool(os), FTAG);

        if (dds.dds_type < DMU_OST_NUMTYPES)
                type = objset_types[dds.dds_type];

        if (dds.dds_type == DMU_OST_META) {
                dds.dds_creation_txg = TXG_INITIAL;
                usedobjs = os->os_rootbp->blk_fill;
                refdbytes = os->os_spa->spa_dsl_pool->
                    dp_mos_dir->dd_phys->dd_used_bytes;
        } else {
                dmu_objset_space(os, &refdbytes, &scratch, &usedobjs, &scratch);
        }

        ASSERT3U(usedobjs, ==, os->os_rootbp->blk_fill);

        zdb_nicenum(refdbytes, numbuf);

        if (verbosity >= 4) {
                (void) sprintf(blkbuf, ", rootbp ");
                (void) sprintf_blkptr(blkbuf + strlen(blkbuf), os->os_rootbp);
        } else {
                blkbuf[0] = '\0';
        }

        dmu_objset_name(os, osname);

        (void) printf("Dataset %s [%s], ID %llu, cr_txg %llu, "
            "%s, %llu objects%s\n",
            osname, type, (u_longlong_t)dmu_objset_id(os),
            (u_longlong_t)dds.dds_creation_txg,
            numbuf, (u_longlong_t)usedobjs, blkbuf);

        if (zopt_objects != 0) {
                for (i = 0; i < zopt_objects; i++)
                        dump_object(os, zopt_object[i], verbosity,
                            &print_header);
                (void) printf("\n");
                return;
        }

        if (dump_opt['i'] != 0 || verbosity >= 2)
                dump_intent_log(dmu_objset_zil(os));

        if (dmu_objset_ds(os) != NULL)
                dump_deadlist(&dmu_objset_ds(os)->ds_deadlist);

        if (verbosity < 2)
                return;

        if (os->os_rootbp->blk_birth == 0)
                return;

        dump_object(os, 0, verbosity, &print_header);
        object_count = 0;
        if (DMU_USERUSED_DNODE(os) != NULL &&
            DMU_USERUSED_DNODE(os)->dn_type != 0) {
                dump_object(os, DMU_USERUSED_OBJECT, verbosity, &print_header);
                dump_object(os, DMU_GROUPUSED_OBJECT, verbosity, &print_header);
        }

        object = 0;
        while ((error = dmu_object_next(os, &object, B_FALSE, 0)) == 0) {
                dump_object(os, object, verbosity, &print_header);
                object_count++;
        }

        ASSERT3U(object_count, ==, usedobjs);

        (void) printf("\n");

        if (error != ESRCH) {
                (void) fprintf(stderr, "dmu_object_next() = %d\n", error);
                abort();
        }
}

static void
dump_uberblock(uberblock_t *ub, const char *header, const char *footer)
{
        time_t timestamp = ub->ub_timestamp;

        (void) printf("%s", header ? header : "");
        (void) printf("\tmagic = %016llx\n", (u_longlong_t)ub->ub_magic);
        (void) printf("\tversion = %llu\n", (u_longlong_t)ub->ub_version);
        (void) printf("\ttxg = %llu\n", (u_longlong_t)ub->ub_txg);
        (void) printf("\tguid_sum = %llu\n", (u_longlong_t)ub->ub_guid_sum);
        (void) printf("\ttimestamp = %llu UTC = %s",
            (u_longlong_t)ub->ub_timestamp, asctime(localtime(&timestamp)));
        if (dump_opt['u'] >= 3) {
                char blkbuf[BP_SPRINTF_LEN];
                sprintf_blkptr(blkbuf, &ub->ub_rootbp);
                (void) printf("\trootbp = %s\n", blkbuf);
        }
        (void) printf("%s", footer ? footer : "");
}

static void
dump_config(spa_t *spa)
{
        dmu_buf_t *db;
        size_t nvsize = 0;
        int error = 0;


        error = dmu_bonus_hold(spa->spa_meta_objset,
            spa->spa_config_object, FTAG, &db);

        if (error == 0) {
                nvsize = *(uint64_t *)db->db_data;
                dmu_buf_rele(db, FTAG);

                (void) printf("\nMOS Configuration:\n");
                dump_packed_nvlist(spa->spa_meta_objset,
                    spa->spa_config_object, (void *)&nvsize, 1);
        } else {
                (void) fprintf(stderr, "dmu_bonus_hold(%llu) failed, errno %d",
                    (u_longlong_t)spa->spa_config_object, error);
        }
}

static void
dump_cachefile(const char *cachefile)
{
        int fd;
        struct stat64 statbuf;
        char *buf;
        nvlist_t *config;

        if ((fd = open64(cachefile, O_RDONLY)) < 0) {
                (void) printf("cannot open '%s': %s\n", cachefile,
                    strerror(errno));
                exit(1);
        }

        if (fstat64(fd, &statbuf) != 0) {
                (void) printf("failed to stat '%s': %s\n", cachefile,
                    strerror(errno));
                exit(1);
        }

        if ((buf = malloc(statbuf.st_size)) == NULL) {
                (void) fprintf(stderr, "failed to allocate %llu bytes\n",
                    (u_longlong_t)statbuf.st_size);
                exit(1);
        }

        if (read(fd, buf, statbuf.st_size) != statbuf.st_size) {
                (void) fprintf(stderr, "failed to read %llu bytes\n",
                    (u_longlong_t)statbuf.st_size);
                exit(1);
        }

        (void) close(fd);

        if (nvlist_unpack(buf, statbuf.st_size, &config, 0) != 0) {
                (void) fprintf(stderr, "failed to unpack nvlist\n");
                exit(1);
        }

        free(buf);

        dump_nvlist(config, 0);

        nvlist_free(config);
}

#define ZDB_MAX_UB_HEADER_SIZE 32

static void
dump_label_uberblocks(vdev_label_t *lbl, uint64_t ashift)
{
        vdev_t vd;
        vdev_t *vdp = &vd;
        char header[ZDB_MAX_UB_HEADER_SIZE];
        int i;

        vd.vdev_ashift = ashift;
        vdp->vdev_top = vdp;

        for (i = 0; i < VDEV_UBERBLOCK_COUNT(vdp); i++) {
                uint64_t uoff = VDEV_UBERBLOCK_OFFSET(vdp, i);
                uberblock_t *ub = (void *)((char *)lbl + uoff);

                if (uberblock_verify(ub))
                        continue;
                (void) snprintf(header, ZDB_MAX_UB_HEADER_SIZE,
                    "Uberblock[%d]\n", i);
                dump_uberblock(ub, header, "");
        }
}

static void
dump_label(const char *dev)
{
        int fd;
        vdev_label_t label;
        char *path, *buf = label.vl_vdev_phys.vp_nvlist;
        size_t buflen = sizeof (label.vl_vdev_phys.vp_nvlist);
        struct stat64 statbuf;
        uint64_t psize, ashift;
        int len = strlen(dev) + 1;
        int l;

        if (strncmp(dev, "/dev/dsk/", 9) == 0) {
                len++;
                path = malloc(len);
                (void) snprintf(path, len, "%s%s", "/dev/rdsk/", dev + 9);
        } else {
                path = strdup(dev);
        }

        if ((fd = open64(path, O_RDONLY)) < 0) {
                (void) printf("cannot open '%s': %s\n", path, strerror(errno));
                free(path);
                exit(1);
        }

        if (fstat64_blk(fd, &statbuf) != 0) {
                (void) printf("failed to stat '%s': %s\n", path,
                    strerror(errno));
                free(path);
                (void) close(fd);
                exit(1);
        }

        psize = statbuf.st_size;
        psize = P2ALIGN(psize, (uint64_t)sizeof (vdev_label_t));

        for (l = 0; l < VDEV_LABELS; l++) {
                nvlist_t *config = NULL;

                (void) printf("--------------------------------------------\n");
                (void) printf("LABEL %d\n", l);
                (void) printf("--------------------------------------------\n");

                if (pread64(fd, &label, sizeof (label),
                    vdev_label_offset(psize, l, 0)) != sizeof (label)) {
                        (void) printf("failed to read label %d\n", l);
                        continue;
                }

                if (nvlist_unpack(buf, buflen, &config, 0) != 0) {
                        (void) printf("failed to unpack label %d\n", l);
                        ashift = SPA_MINBLOCKSHIFT;
                } else {
                        nvlist_t *vdev_tree = NULL;

                        dump_nvlist(config, 4);
                        if ((nvlist_lookup_nvlist(config,
                            ZPOOL_CONFIG_VDEV_TREE, &vdev_tree) != 0) ||
                            (nvlist_lookup_uint64(vdev_tree,
                            ZPOOL_CONFIG_ASHIFT, &ashift) != 0))
                                ashift = SPA_MINBLOCKSHIFT;
                        nvlist_free(config);
                }
                if (dump_opt['u'])
                        dump_label_uberblocks(&label, ashift);
        }

        free(path);
        (void) close(fd);
}

/*ARGSUSED*/
static int
dump_one_dir(const char *dsname, void *arg)
{
        int error;
        objset_t *os;

        error = dmu_objset_own(dsname, DMU_OST_ANY, B_TRUE, FTAG, &os);
        if (error) {
                (void) printf("Could not open %s, error %d\n", dsname, error);
                return (0);
        }
        dump_dir(os);
        dmu_objset_disown(os, FTAG);
        fuid_table_destroy();
        sa_loaded = B_FALSE;
        return (0);
}

/*
 * Block statistics.
 */
typedef struct zdb_blkstats {
        uint64_t        zb_asize;
        uint64_t        zb_lsize;
        uint64_t        zb_psize;
        uint64_t        zb_count;
} zdb_blkstats_t;

/*
 * Extended object types to report deferred frees and dedup auto-ditto blocks.
 */
#define ZDB_OT_DEFERRED (DMU_OT_NUMTYPES + 0)
#define ZDB_OT_DITTO    (DMU_OT_NUMTYPES + 1)
#define ZDB_OT_OTHER    (DMU_OT_NUMTYPES + 2)
#define ZDB_OT_TOTAL    (DMU_OT_NUMTYPES + 3)

static char *zdb_ot_extname[] = {
        "deferred free",
        "dedup ditto",
        "other",
        "Total",
};

#define ZB_TOTAL        DN_MAX_LEVELS

typedef struct zdb_cb {
        zdb_blkstats_t  zcb_type[ZB_TOTAL + 1][ZDB_OT_TOTAL + 1];
        uint64_t        zcb_dedup_asize;
        uint64_t        zcb_dedup_blocks;
        uint64_t        zcb_errors[256];
        int             zcb_readfails;
        int             zcb_haderrors;
        spa_t           *zcb_spa;
} zdb_cb_t;

static void
zdb_count_block(zdb_cb_t *zcb, zilog_t *zilog, const blkptr_t *bp,
    dmu_object_type_t type)
{
        uint64_t refcnt = 0;
        int i;

        ASSERT(type < ZDB_OT_TOTAL);

        if (zilog && zil_bp_tree_add(zilog, bp) != 0)
                return;

        for (i = 0; i < 4; i++) {
                int l = (i < 2) ? BP_GET_LEVEL(bp) : ZB_TOTAL;
                int t = (i & 1) ? type : ZDB_OT_TOTAL;
                zdb_blkstats_t *zb = &zcb->zcb_type[l][t];

                zb->zb_asize += BP_GET_ASIZE(bp);
                zb->zb_lsize += BP_GET_LSIZE(bp);
                zb->zb_psize += BP_GET_PSIZE(bp);
                zb->zb_count++;
        }

        if (dump_opt['L'])
                return;

        if (BP_GET_DEDUP(bp)) {
                ddt_t *ddt;
                ddt_entry_t *dde;

                ddt = ddt_select(zcb->zcb_spa, bp);
                ddt_enter(ddt);
                dde = ddt_lookup(ddt, bp, B_FALSE);

                if (dde == NULL) {
                        refcnt = 0;
                } else {
                        ddt_phys_t *ddp = ddt_phys_select(dde, bp);
                        ddt_phys_decref(ddp);
                        refcnt = ddp->ddp_refcnt;
                        if (ddt_phys_total_refcnt(dde) == 0)
                                ddt_remove(ddt, dde);
                }
                ddt_exit(ddt);
        }

        VERIFY3U(zio_wait(zio_claim(NULL, zcb->zcb_spa,
            refcnt ? 0 : spa_first_txg(zcb->zcb_spa),
            bp, NULL, NULL, ZIO_FLAG_CANFAIL)), ==, 0);
}

static void
zdb_blkptr_done(zio_t *zio)
{
        spa_t *spa = zio->io_spa;
        blkptr_t *bp = zio->io_bp;
        int ioerr = zio->io_error;
        zdb_cb_t *zcb = zio->io_private;
        zbookmark_t *zb = &zio->io_bookmark;

        zio_data_buf_free(zio->io_data, zio->io_size);

        mutex_enter(&spa->spa_scrub_lock);
        spa->spa_scrub_inflight--;
        cv_broadcast(&spa->spa_scrub_io_cv);

        if (ioerr && !(zio->io_flags & ZIO_FLAG_SPECULATIVE)) {
                char blkbuf[BP_SPRINTF_LEN];

                zcb->zcb_haderrors = 1;
                zcb->zcb_errors[ioerr]++;

                if (dump_opt['b'] >= 2)
                        sprintf_blkptr(blkbuf, bp);
                else
                        blkbuf[0] = '\0';

                (void) printf("zdb_blkptr_cb: "
                    "Got error %d reading "
                    "<%llu, %llu, %lld, %llx> %s -- skipping\n",
                    ioerr,
                    (u_longlong_t)zb->zb_objset,
                    (u_longlong_t)zb->zb_object,
                    (u_longlong_t)zb->zb_level,
                    (u_longlong_t)zb->zb_blkid,
                    blkbuf);
        }
        mutex_exit(&spa->spa_scrub_lock);
}

static int
zdb_blkptr_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
    const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
{
        zdb_cb_t *zcb = arg;
        char blkbuf[BP_SPRINTF_LEN];
        dmu_object_type_t type;
        boolean_t is_metadata;

        if (bp == NULL)
                return (0);

        type = BP_GET_TYPE(bp);

        zdb_count_block(zcb, zilog, bp,
            (type & DMU_OT_NEWTYPE) ? ZDB_OT_OTHER : type);

        is_metadata = (BP_GET_LEVEL(bp) != 0 || DMU_OT_IS_METADATA(type));

        if (dump_opt['c'] > 1 || (dump_opt['c'] && is_metadata)) {
                size_t size = BP_GET_PSIZE(bp);
                void *data = zio_data_buf_alloc(size);
                int flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SCRUB | ZIO_FLAG_RAW;

                /* If it's an intent log block, failure is expected. */
                if (zb->zb_level == ZB_ZIL_LEVEL)
                        flags |= ZIO_FLAG_SPECULATIVE;

                mutex_enter(&spa->spa_scrub_lock);
                while (spa->spa_scrub_inflight > max_inflight)
                        cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock);
                spa->spa_scrub_inflight++;
                mutex_exit(&spa->spa_scrub_lock);

                zio_nowait(zio_read(NULL, spa, bp, data, size,
                    zdb_blkptr_done, zcb, ZIO_PRIORITY_ASYNC_READ, flags, zb));
        }

        zcb->zcb_readfails = 0;

        if (dump_opt['b'] >= 4) {
                sprintf_blkptr(blkbuf, bp);
                (void) printf("objset %llu object %llu "
                    "level %lld offset 0x%llx %s\n",
                    (u_longlong_t)zb->zb_objset,
                    (u_longlong_t)zb->zb_object,
                    (longlong_t)zb->zb_level,
                    (u_longlong_t)blkid2offset(dnp, bp, zb),
                    blkbuf);
        }

        return (0);
}

static void
zdb_leak(space_map_t *sm, uint64_t start, uint64_t size)
{
        vdev_t *vd = sm->sm_ppd;

        (void) printf("leaked space: vdev %llu, offset 0x%llx, size %llu\n",
            (u_longlong_t)vd->vdev_id, (u_longlong_t)start, (u_longlong_t)size);
}

/* ARGSUSED */
static void
zdb_space_map_load(space_map_t *sm)
{
}

static void
zdb_space_map_unload(space_map_t *sm)
{
        space_map_vacate(sm, zdb_leak, sm);
}

/* ARGSUSED */
static void
zdb_space_map_claim(space_map_t *sm, uint64_t start, uint64_t size)
{
}

static space_map_ops_t zdb_space_map_ops = {
        zdb_space_map_load,
        zdb_space_map_unload,
        NULL,   /* alloc */
        zdb_space_map_claim,
        NULL,   /* free */
        NULL    /* maxsize */
};

static void
zdb_ddt_leak_init(spa_t *spa, zdb_cb_t *zcb)
{
        ddt_bookmark_t ddb = { 0 };
        ddt_entry_t dde;
        int error;
        int p;

        while ((error = ddt_walk(spa, &ddb, &dde)) == 0) {
                blkptr_t blk;
                ddt_phys_t *ddp = dde.dde_phys;

                if (ddb.ddb_class == DDT_CLASS_UNIQUE)
                        return;

                ASSERT(ddt_phys_total_refcnt(&dde) > 1);

                for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
                        if (ddp->ddp_phys_birth == 0)
                                continue;
                        ddt_bp_create(ddb.ddb_checksum,
                            &dde.dde_key, ddp, &blk);
                        if (p == DDT_PHYS_DITTO) {
                                zdb_count_block(zcb, NULL, &blk, ZDB_OT_DITTO);
                        } else {
                                zcb->zcb_dedup_asize +=
                                    BP_GET_ASIZE(&blk) * (ddp->ddp_refcnt - 1);
                                zcb->zcb_dedup_blocks++;
                        }
                }
                if (!dump_opt['L']) {
                        ddt_t *ddt = spa->spa_ddt[ddb.ddb_checksum];
                        ddt_enter(ddt);
                        VERIFY(ddt_lookup(ddt, &blk, B_TRUE) != NULL);
                        ddt_exit(ddt);
                }
        }

        ASSERT(error == ENOENT);
}

static void
zdb_leak_init(spa_t *spa, zdb_cb_t *zcb)
{
        zcb->zcb_spa = spa;
        int c, m;

        if (!dump_opt['L']) {
                vdev_t *rvd = spa->spa_root_vdev;
                for (c = 0; c < rvd->vdev_children; c++) {
                        vdev_t *vd = rvd->vdev_child[c];
                        for (m = 0; m < vd->vdev_ms_count; m++) {
                                metaslab_t *msp = vd->vdev_ms[m];
                                mutex_enter(&msp->ms_lock);
                                space_map_unload(msp->ms_map);
                                VERIFY(space_map_load(msp->ms_map,
                                    &zdb_space_map_ops, SM_ALLOC, &msp->ms_smo,
                                    spa->spa_meta_objset) == 0);
                                msp->ms_map->sm_ppd = vd;
                                mutex_exit(&msp->ms_lock);
                        }
                }
        }

        spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);

        zdb_ddt_leak_init(spa, zcb);

        spa_config_exit(spa, SCL_CONFIG, FTAG);
}

static void
zdb_leak_fini(spa_t *spa)
{
        int c, m;

        if (!dump_opt['L']) {
                vdev_t *rvd = spa->spa_root_vdev;
                for (c = 0; c < rvd->vdev_children; c++) {
                        vdev_t *vd = rvd->vdev_child[c];
                        for (m = 0; m < vd->vdev_ms_count; m++) {
                                metaslab_t *msp = vd->vdev_ms[m];
                                mutex_enter(&msp->ms_lock);
                                space_map_unload(msp->ms_map);
                                mutex_exit(&msp->ms_lock);
                        }
                }
        }
}

/* ARGSUSED */
static int
count_block_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
{
        zdb_cb_t *zcb = arg;

        if (dump_opt['b'] >= 4) {
                char blkbuf[BP_SPRINTF_LEN];
                sprintf_blkptr(blkbuf, bp);
                (void) printf("[%s] %s\n",
                    "deferred free", blkbuf);
        }
        zdb_count_block(zcb, NULL, bp, ZDB_OT_DEFERRED);
        return (0);
}

static int
dump_block_stats(spa_t *spa)
{
        zdb_cb_t zcb;
        zdb_blkstats_t *zb, *tzb;
        uint64_t norm_alloc, norm_space, total_alloc, total_found;
        int flags = TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA | TRAVERSE_HARD;
        int leaks = 0;
        int e;

        (void) printf("\nTraversing all blocks %s%s%s%s%s...\n",
            (dump_opt['c'] || !dump_opt['L']) ? "to verify " : "",
            (dump_opt['c'] == 1) ? "metadata " : "",
            dump_opt['c'] ? "checksums " : "",
            (dump_opt['c'] && !dump_opt['L']) ? "and verify " : "",
            !dump_opt['L'] ? "nothing leaked " : "");

        /*
         * Load all space maps as SM_ALLOC maps, then traverse the pool
         * claiming each block we discover.  If the pool is perfectly
         * consistent, the space maps will be empty when we're done.
         * Anything left over is a leak; any block we can't claim (because
         * it's not part of any space map) is a double allocation,
         * reference to a freed block, or an unclaimed log block.
         */
        bzero(&zcb, sizeof(zdb_cb_t));
        zdb_leak_init(spa, &zcb);

        /*
         * If there's a deferred-free bplist, process that first.
         */
        (void) bpobj_iterate_nofree(&spa->spa_deferred_bpobj,
            count_block_cb, &zcb, NULL);
        if (spa_version(spa) >= SPA_VERSION_DEADLISTS) {
                (void) bpobj_iterate_nofree(&spa->spa_dsl_pool->dp_free_bpobj,
                    count_block_cb, &zcb, NULL);
        }
        if (spa_feature_is_active(spa,
            &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY])) {
                VERIFY3U(0, ==, bptree_iterate(spa->spa_meta_objset,
                    spa->spa_dsl_pool->dp_bptree_obj, B_FALSE, count_block_cb,
                    &zcb, NULL));
        }

        if (dump_opt['c'] > 1)
                flags |= TRAVERSE_PREFETCH_DATA;

        zcb.zcb_haderrors |= traverse_pool(spa, 0, flags, zdb_blkptr_cb, &zcb);

        /*
         * If we've traversed the data blocks then we need to wait for those
         * I/Os to complete. We leverage "The Godfather" zio to wait on
         * all async I/Os to complete.
         */
        if (dump_opt['c']) {
                (void) zio_wait(spa->spa_async_zio_root);
                spa->spa_async_zio_root = zio_root(spa, NULL, NULL,
                    ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE |
                    ZIO_FLAG_GODFATHER);
        }

        if (zcb.zcb_haderrors) {
                (void) printf("\nError counts:\n\n");
                (void) printf("\t%5s  %s\n", "errno", "count");
                for (e = 0; e < 256; e++) {
                        if (zcb.zcb_errors[e] != 0) {
                                (void) printf("\t%5d  %llu\n",
                                    e, (u_longlong_t)zcb.zcb_errors[e]);
                        }
                }
        }

        /*
         * Report any leaked segments.
         */
        zdb_leak_fini(spa);

        tzb = &zcb.zcb_type[ZB_TOTAL][ZDB_OT_TOTAL];

        norm_alloc = metaslab_class_get_alloc(spa_normal_class(spa));
        norm_space = metaslab_class_get_space(spa_normal_class(spa));

        total_alloc = norm_alloc + metaslab_class_get_alloc(spa_log_class(spa));
        total_found = tzb->zb_asize - zcb.zcb_dedup_asize;

        if (total_found == total_alloc) {
                if (!dump_opt['L'])
                        (void) printf("\n\tNo leaks (block sum matches space"
                            " maps exactly)\n");
        } else {
                (void) printf("block traversal size %llu != alloc %llu "
                    "(%s %lld)\n",
                    (u_longlong_t)total_found,
                    (u_longlong_t)total_alloc,
                    (dump_opt['L']) ? "unreachable" : "leaked",
                    (longlong_t)(total_alloc - total_found));
                leaks = 1;
        }

        if (tzb->zb_count == 0)
                return (2);

        (void) printf("\n");
        (void) printf("\tbp count:      %10llu\n",
            (u_longlong_t)tzb->zb_count);
        (void) printf("\tbp logical:    %10llu      avg: %6llu\n",
            (u_longlong_t)tzb->zb_lsize,
            (u_longlong_t)(tzb->zb_lsize / tzb->zb_count));
        (void) printf("\tbp physical:   %10llu      avg:"
            " %6llu     compression: %6.2f\n",
            (u_longlong_t)tzb->zb_psize,
            (u_longlong_t)(tzb->zb_psize / tzb->zb_count),
            (double)tzb->zb_lsize / tzb->zb_psize);
        (void) printf("\tbp allocated:  %10llu      avg:"
            " %6llu     compression: %6.2f\n",
            (u_longlong_t)tzb->zb_asize,
            (u_longlong_t)(tzb->zb_asize / tzb->zb_count),
            (double)tzb->zb_lsize / tzb->zb_asize);
        (void) printf("\tbp deduped:    %10llu    ref>1:"
            " %6llu   deduplication: %6.2f\n",
            (u_longlong_t)zcb.zcb_dedup_asize,
            (u_longlong_t)zcb.zcb_dedup_blocks,
            (double)zcb.zcb_dedup_asize / tzb->zb_asize + 1.0);
        (void) printf("\tSPA allocated: %10llu     used: %5.2f%%\n",
            (u_longlong_t)norm_alloc, 100.0 * norm_alloc / norm_space);

        if (dump_opt['b'] >= 2) {
                int l, t, level;
                (void) printf("\nBlocks\tLSIZE\tPSIZE\tASIZE"
                    "\t  avg\t comp\t%%Total\tType\n");

                for (t = 0; t <= ZDB_OT_TOTAL; t++) {
                        char csize[32], lsize[32], psize[32], asize[32];
                        char avg[32];
                        char *typename;

                        if (t < DMU_OT_NUMTYPES)
                                typename = dmu_ot[t].ot_name;
                        else
                                typename = zdb_ot_extname[t - DMU_OT_NUMTYPES];

                        if (zcb.zcb_type[ZB_TOTAL][t].zb_asize == 0) {
                                (void) printf("%6s\t%5s\t%5s\t%5s"
                                    "\t%5s\t%5s\t%6s\t%s\n",
                                    "-",
                                    "-",
                                    "-",
                                    "-",
                                    "-",
                                    "-",
                                    "-",
                                    typename);
                                continue;
                        }

                        for (l = ZB_TOTAL - 1; l >= -1; l--) {
                                level = (l == -1 ? ZB_TOTAL : l);
                                zb = &zcb.zcb_type[level][t];

                                if (zb->zb_asize == 0)
                                        continue;

                                if (dump_opt['b'] < 3 && level != ZB_TOTAL)
                                        continue;

                                if (level == 0 && zb->zb_asize ==
                                    zcb.zcb_type[ZB_TOTAL][t].zb_asize)
                                        continue;

                                zdb_nicenum(zb->zb_count, csize);
                                zdb_nicenum(zb->zb_lsize, lsize);
                                zdb_nicenum(zb->zb_psize, psize);
                                zdb_nicenum(zb->zb_asize, asize);
                                zdb_nicenum(zb->zb_asize / zb->zb_count, avg);

                                (void) printf("%6s\t%5s\t%5s\t%5s\t%5s"
                                    "\t%5.2f\t%6.2f\t",
                                    csize, lsize, psize, asize, avg,
                                    (double)zb->zb_lsize / zb->zb_psize,
                                    100.0 * zb->zb_asize / tzb->zb_asize);

                                if (level == ZB_TOTAL)
                                        (void) printf("%s\n", typename);
                                else
                                        (void) printf("    L%d %s\n",
                                            level, typename);
                        }
                }
        }

        (void) printf("\n");

        if (leaks)
                return (2);

        if (zcb.zcb_haderrors)
                return (3);

        return (0);
}

typedef struct zdb_ddt_entry {
        ddt_key_t       zdde_key;
        uint64_t        zdde_ref_blocks;
        uint64_t        zdde_ref_lsize;
        uint64_t        zdde_ref_psize;
        uint64_t        zdde_ref_dsize;
        avl_node_t      zdde_node;
} zdb_ddt_entry_t;

/* ARGSUSED */
static int
zdb_ddt_add_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
    const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
{
        avl_tree_t *t = arg;
        avl_index_t where;
        zdb_ddt_entry_t *zdde, zdde_search;

        if (bp == NULL)
                return (0);

        if (dump_opt['S'] > 1 && zb->zb_level == ZB_ROOT_LEVEL) {
                (void) printf("traversing objset %llu, %llu objects, "
                    "%lu blocks so far\n",
                    (u_longlong_t)zb->zb_objset,
                    (u_longlong_t)bp->blk_fill,
                    avl_numnodes(t));
        }

        if (BP_IS_HOLE(bp) || BP_GET_CHECKSUM(bp) == ZIO_CHECKSUM_OFF ||
            BP_GET_LEVEL(bp) > 0 || DMU_OT_IS_METADATA(BP_GET_TYPE(bp)))
                return (0);

        ddt_key_fill(&zdde_search.zdde_key, bp);

        zdde = avl_find(t, &zdde_search, &where);

        if (zdde == NULL) {
                zdde = umem_zalloc(sizeof (*zdde), UMEM_NOFAIL);
                zdde->zdde_key = zdde_search.zdde_key;
                avl_insert(t, zdde, where);
        }

        zdde->zdde_ref_blocks += 1;
        zdde->zdde_ref_lsize += BP_GET_LSIZE(bp);
        zdde->zdde_ref_psize += BP_GET_PSIZE(bp);
        zdde->zdde_ref_dsize += bp_get_dsize_sync(spa, bp);

        return (0);
}

static void
dump_simulated_ddt(spa_t *spa)
{
        avl_tree_t t;
        void *cookie = NULL;
        zdb_ddt_entry_t *zdde;
        ddt_histogram_t ddh_total;
        ddt_stat_t dds_total;

        bzero(&ddh_total, sizeof (ddt_histogram_t));
        bzero(&dds_total, sizeof (ddt_stat_t));

        avl_create(&t, ddt_entry_compare,
            sizeof (zdb_ddt_entry_t), offsetof(zdb_ddt_entry_t, zdde_node));

        spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);

        (void) traverse_pool(spa, 0, TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA,
            zdb_ddt_add_cb, &t);

        spa_config_exit(spa, SCL_CONFIG, FTAG);

        while ((zdde = avl_destroy_nodes(&t, &cookie)) != NULL) {
                ddt_stat_t dds;
                uint64_t refcnt = zdde->zdde_ref_blocks;
                ASSERT(refcnt != 0);

                dds.dds_blocks = zdde->zdde_ref_blocks / refcnt;
                dds.dds_lsize = zdde->zdde_ref_lsize / refcnt;
                dds.dds_psize = zdde->zdde_ref_psize / refcnt;
                dds.dds_dsize = zdde->zdde_ref_dsize / refcnt;

                dds.dds_ref_blocks = zdde->zdde_ref_blocks;
                dds.dds_ref_lsize = zdde->zdde_ref_lsize;
                dds.dds_ref_psize = zdde->zdde_ref_psize;
                dds.dds_ref_dsize = zdde->zdde_ref_dsize;

                ddt_stat_add(&ddh_total.ddh_stat[highbit(refcnt) - 1], &dds, 0);

                umem_free(zdde, sizeof (*zdde));
        }

        avl_destroy(&t);

        ddt_histogram_stat(&dds_total, &ddh_total);

        (void) printf("Simulated DDT histogram:\n");

        zpool_dump_ddt(&dds_total, &ddh_total);

        dump_dedup_ratio(&dds_total);
}

static void
dump_zpool(spa_t *spa)
{
        dsl_pool_t *dp = spa_get_dsl(spa);
        int rc = 0;

        if (dump_opt['S']) {
                dump_simulated_ddt(spa);
                return;
        }

        if (!dump_opt['e'] && dump_opt['C'] > 1) {
                (void) printf("\nCached configuration:\n");
                dump_nvlist(spa->spa_config, 8);
        }

        if (dump_opt['C'])
                dump_config(spa);

        if (dump_opt['u'])
                dump_uberblock(&spa->spa_uberblock, "\nUberblock:\n", "\n");

        if (dump_opt['D'])
                dump_all_ddts(spa);

        if (dump_opt['d'] > 2 || dump_opt['m'])
                dump_metaslabs(spa);

        if (dump_opt['d'] || dump_opt['i']) {
                dump_dir(dp->dp_meta_objset);
                if (dump_opt['d'] >= 3) {
                        dump_bpobj(&spa->spa_deferred_bpobj,
                            "Deferred frees", 0);
                        if (spa_version(spa) >= SPA_VERSION_DEADLISTS) {
                                dump_bpobj(&spa->spa_dsl_pool->dp_free_bpobj,
                                    "Pool snapshot frees", 0);
                        }

                        if (spa_feature_is_active(spa,
                            &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY])) {
                                dump_bptree(spa->spa_meta_objset,
                                    spa->spa_dsl_pool->dp_bptree_obj,
                                    "Pool dataset frees");
                        }
                        dump_dtl(spa->spa_root_vdev, 0);
                }
                (void) dmu_objset_find(spa_name(spa), dump_one_dir,
                    NULL, DS_FIND_SNAPSHOTS | DS_FIND_CHILDREN);
        }
        if (dump_opt['b'] || dump_opt['c'])
                rc = dump_block_stats(spa);

        if (dump_opt['s'])
                show_pool_stats(spa);

        if (dump_opt['h'])
                dump_history(spa);

        if (rc != 0)
                exit(rc);
}

#define ZDB_FLAG_CHECKSUM       0x0001
#define ZDB_FLAG_DECOMPRESS     0x0002
#define ZDB_FLAG_BSWAP          0x0004
#define ZDB_FLAG_GBH            0x0008
#define ZDB_FLAG_INDIRECT       0x0010
#define ZDB_FLAG_PHYS           0x0020
#define ZDB_FLAG_RAW            0x0040
#define ZDB_FLAG_PRINT_BLKPTR   0x0080

int flagbits[256];

static void
zdb_print_blkptr(blkptr_t *bp, int flags)
{
        char blkbuf[BP_SPRINTF_LEN];

        if (flags & ZDB_FLAG_BSWAP)
                byteswap_uint64_array((void *)bp, sizeof (blkptr_t));

        sprintf_blkptr(blkbuf, bp);
        (void) printf("%s\n", blkbuf);
}

static void
zdb_dump_indirect(blkptr_t *bp, int nbps, int flags)
{
        int i;

        for (i = 0; i < nbps; i++)
                zdb_print_blkptr(&bp[i], flags);
}

static void
zdb_dump_gbh(void *buf, int flags)
{
        zdb_dump_indirect((blkptr_t *)buf, SPA_GBH_NBLKPTRS, flags);
}

static void
zdb_dump_block_raw(void *buf, uint64_t size, int flags)
{
        if (flags & ZDB_FLAG_BSWAP)
                byteswap_uint64_array(buf, size);
        VERIFY(write(fileno(stdout), buf, size) == size);
}

static void
zdb_dump_block(char *label, void *buf, uint64_t size, int flags)
{
        uint64_t *d = (uint64_t *)buf;
        int nwords = size / sizeof (uint64_t);
        int do_bswap = !!(flags & ZDB_FLAG_BSWAP);
        int i, j;
        char *hdr, *c;


        if (do_bswap)
                hdr = " 7 6 5 4 3 2 1 0   f e d c b a 9 8";
        else
                hdr = " 0 1 2 3 4 5 6 7   8 9 a b c d e f";

        (void) printf("\n%s\n%6s   %s  0123456789abcdef\n", label, "", hdr);

        for (i = 0; i < nwords; i += 2) {
                (void) printf("%06llx:  %016llx  %016llx  ",
                    (u_longlong_t)(i * sizeof (uint64_t)),
                    (u_longlong_t)(do_bswap ? BSWAP_64(d[i]) : d[i]),
                    (u_longlong_t)(do_bswap ? BSWAP_64(d[i + 1]) : d[i + 1]));

                c = (char *)&d[i];
                for (j = 0; j < 2 * sizeof (uint64_t); j++)
                        (void) printf("%c", isprint(c[j]) ? c[j] : '.');
                (void) printf("\n");
        }
}

/*
 * There are two acceptable formats:
 *      leaf_name         - For example: c1t0d0 or /tmp/ztest.0a
 *      child[.child]*    - For example: 0.1.1
 *
 * The second form can be used to specify arbitrary vdevs anywhere
 * in the heirarchy.  For example, in a pool with a mirror of
 * RAID-Zs, you can specify either RAID-Z vdev with 0.0 or 0.1 .
 */
static vdev_t *
zdb_vdev_lookup(vdev_t *vdev, char *path)
{
        char *s, *p, *q;
        int i;

        if (vdev == NULL)
                return (NULL);

        /* First, assume the x.x.x.x format */
        i = (int)strtoul(path, &s, 10);
        if (s == path || (s && *s != '.' && *s != '\0'))
                goto name;
        if (i < 0 || i >= vdev->vdev_children)
                return (NULL);

        vdev = vdev->vdev_child[i];
        if (*s == '\0')
                return (vdev);
        return (zdb_vdev_lookup(vdev, s+1));

name:
        for (i = 0; i < vdev->vdev_children; i++) {
                vdev_t *vc = vdev->vdev_child[i];

                if (vc->vdev_path == NULL) {
                        vc = zdb_vdev_lookup(vc, path);
                        if (vc == NULL)
                                continue;
                        else
                                return (vc);
                }

                p = strrchr(vc->vdev_path, '/');
                p = p ? p + 1 : vc->vdev_path;
                q = &vc->vdev_path[strlen(vc->vdev_path) - 2];

                if (strcmp(vc->vdev_path, path) == 0)
                        return (vc);
                if (strcmp(p, path) == 0)
                        return (vc);
                if (strcmp(q, "s0") == 0 && strncmp(p, path, q - p) == 0)
                        return (vc);
        }

        return (NULL);
}

/*
 * Read a block from a pool and print it out.  The syntax of the
 * block descriptor is:
 *
 *      pool:vdev_specifier:offset:size[:flags]
 *
 *      pool           - The name of the pool you wish to read from
 *      vdev_specifier - Which vdev (see comment for zdb_vdev_lookup)
 *      offset         - offset, in hex, in bytes
 *      size           - Amount of data to read, in hex, in bytes
 *      flags          - A string of characters specifying options
 *               b: Decode a blkptr at given offset within block
 *              *c: Calculate and display checksums
 *               d: Decompress data before dumping
 *               e: Byteswap data before dumping
 *               g: Display data as a gang block header
 *               i: Display as an indirect block
 *               p: Do I/O to physical offset
 *               r: Dump raw data to stdout
 *
 *              * = not yet implemented
 */
static void
zdb_read_block(char *thing, spa_t *spa)
{
        blkptr_t blk, *bp = &blk;
        dva_t *dva = bp->blk_dva;
        int flags = 0;
        uint64_t offset = 0, size = 0, psize = 0, lsize = 0, blkptr_offset = 0;
        zio_t *zio;
        vdev_t *vd;
        void *pbuf, *lbuf, *buf;
        char *s, *p, *dup, *vdev, *flagstr;
        int i, error;

        dup = strdup(thing);
        s = strtok(dup, ":");
        vdev = s ? s : "";
        s = strtok(NULL, ":");
        offset = strtoull(s ? s : "", NULL, 16);
        s = strtok(NULL, ":");
        size = strtoull(s ? s : "", NULL, 16);
        s = strtok(NULL, ":");
        flagstr = s ? s : "";

        s = NULL;
        if (size == 0)
                s = "size must not be zero";
        if (!IS_P2ALIGNED(size, DEV_BSIZE))
                s = "size must be a multiple of sector size";
        if (!IS_P2ALIGNED(offset, DEV_BSIZE))
                s = "offset must be a multiple of sector size";
        if (s) {
                (void) printf("Invalid block specifier: %s  - %s\n", thing, s);
                free(dup);
                return;
        }

        for (s = strtok(flagstr, ":"); s; s = strtok(NULL, ":")) {
                for (i = 0; flagstr[i]; i++) {
                        int bit = flagbits[(uchar_t)flagstr[i]];

                        if (bit == 0) {
                                (void) printf("***Invalid flag: %c\n",
                                    flagstr[i]);
                                continue;
                        }
                        flags |= bit;

                        /* If it's not something with an argument, keep going */
                        if ((bit & (ZDB_FLAG_CHECKSUM |
                            ZDB_FLAG_PRINT_BLKPTR)) == 0)
                                continue;

                        p = &flagstr[i + 1];
                        if (bit == ZDB_FLAG_PRINT_BLKPTR)
                                blkptr_offset = strtoull(p, &p, 16);
                        if (*p != ':' && *p != '\0') {
                                (void) printf("***Invalid flag arg: '%s'\n", s);
                                free(dup);
                                return;
                        }
                }
        }

        vd = zdb_vdev_lookup(spa->spa_root_vdev, vdev);
        if (vd == NULL) {
                (void) printf("***Invalid vdev: %s\n", vdev);
                free(dup);
                return;
        } else {
                if (vd->vdev_path)
                        (void) fprintf(stderr, "Found vdev: %s\n",
                            vd->vdev_path);
                else
                        (void) fprintf(stderr, "Found vdev type: %s\n",
                            vd->vdev_ops->vdev_op_type);
        }

        psize = size;
        lsize = size;

        pbuf = umem_alloc_aligned(SPA_MAXBLOCKSIZE, 512, UMEM_NOFAIL);
        lbuf = umem_alloc(SPA_MAXBLOCKSIZE, UMEM_NOFAIL);

        BP_ZERO(bp);

        DVA_SET_VDEV(&dva[0], vd->vdev_id);
        DVA_SET_OFFSET(&dva[0], offset);
        DVA_SET_GANG(&dva[0], !!(flags & ZDB_FLAG_GBH));
        DVA_SET_ASIZE(&dva[0], vdev_psize_to_asize(vd, psize));

        BP_SET_BIRTH(bp, TXG_INITIAL, TXG_INITIAL);

        BP_SET_LSIZE(bp, lsize);
        BP_SET_PSIZE(bp, psize);
        BP_SET_COMPRESS(bp, ZIO_COMPRESS_OFF);
        BP_SET_CHECKSUM(bp, ZIO_CHECKSUM_OFF);
        BP_SET_TYPE(bp, DMU_OT_NONE);
        BP_SET_LEVEL(bp, 0);
        BP_SET_DEDUP(bp, 0);
        BP_SET_BYTEORDER(bp, ZFS_HOST_BYTEORDER);

        spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
        zio = zio_root(spa, NULL, NULL, 0);

        if (vd == vd->vdev_top) {
                /*
                 * Treat this as a normal block read.
                 */
                zio_nowait(zio_read(zio, spa, bp, pbuf, psize, NULL, NULL,
                    ZIO_PRIORITY_SYNC_READ,
                    ZIO_FLAG_CANFAIL | ZIO_FLAG_RAW, NULL));
        } else {
                /*
                 * Treat this as a vdev child I/O.
                 */
                zio_nowait(zio_vdev_child_io(zio, bp, vd, offset, pbuf, psize,
                    ZIO_TYPE_READ, ZIO_PRIORITY_SYNC_READ,
                    ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_QUEUE |
                    ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY |
                    ZIO_FLAG_CANFAIL | ZIO_FLAG_RAW, NULL, NULL));
        }

        error = zio_wait(zio);
        spa_config_exit(spa, SCL_STATE, FTAG);

        if (error) {
                (void) printf("Read of %s failed, error: %d\n", thing, error);
                goto out;
        }

        if (flags & ZDB_FLAG_DECOMPRESS) {
                /*
                 * We don't know how the data was compressed, so just try
                 * every decompress function at every inflated blocksize.
                 */
                enum zio_compress c;
                void *pbuf2 = umem_alloc(SPA_MAXBLOCKSIZE, UMEM_NOFAIL);
                void *lbuf2 = umem_alloc(SPA_MAXBLOCKSIZE, UMEM_NOFAIL);

                bcopy(pbuf, pbuf2, psize);

                VERIFY(random_get_pseudo_bytes((uint8_t *)pbuf + psize,
                    SPA_MAXBLOCKSIZE - psize) == 0);

                VERIFY(random_get_pseudo_bytes((uint8_t *)pbuf2 + psize,
                    SPA_MAXBLOCKSIZE - psize) == 0);

                for (lsize = SPA_MAXBLOCKSIZE; lsize > psize;
                    lsize -= SPA_MINBLOCKSIZE) {
                        for (c = 0; c < ZIO_COMPRESS_FUNCTIONS; c++) {
                                if (zio_decompress_data(c, pbuf, lbuf,
                                    psize, lsize) == 0 &&
                                    zio_decompress_data(c, pbuf2, lbuf2,
                                    psize, lsize) == 0 &&
                                    bcmp(lbuf, lbuf2, lsize) == 0)
                                        break;
                        }
                        if (c != ZIO_COMPRESS_FUNCTIONS)
                                break;
                        lsize -= SPA_MINBLOCKSIZE;
                }

                umem_free(pbuf2, SPA_MAXBLOCKSIZE);
                umem_free(lbuf2, SPA_MAXBLOCKSIZE);

                if (lsize <= psize) {
                        (void) printf("Decompress of %s failed\n", thing);
                        goto out;
                }
                buf = lbuf;
                size = lsize;
        } else {
                buf = pbuf;
                size = psize;
        }

        if (flags & ZDB_FLAG_PRINT_BLKPTR)
                zdb_print_blkptr((blkptr_t *)(void *)
                    ((uintptr_t)buf + (uintptr_t)blkptr_offset), flags);
        else if (flags & ZDB_FLAG_RAW)
                zdb_dump_block_raw(buf, size, flags);
        else if (flags & ZDB_FLAG_INDIRECT)
                zdb_dump_indirect((blkptr_t *)buf, size / sizeof (blkptr_t),
                    flags);
        else if (flags & ZDB_FLAG_GBH)
                zdb_dump_gbh(buf, flags);
        else
                zdb_dump_block(thing, buf, size, flags);

out:
        umem_free(pbuf, SPA_MAXBLOCKSIZE);
        umem_free(lbuf, SPA_MAXBLOCKSIZE);
        free(dup);
}

static boolean_t
pool_match(nvlist_t *cfg, char *tgt)
{
        uint64_t v, guid = strtoull(tgt, NULL, 0);
        char *s;

        if (guid != 0) {
                if (nvlist_lookup_uint64(cfg, ZPOOL_CONFIG_POOL_GUID, &v) == 0)
                        return (v == guid);
        } else {
                if (nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &s) == 0)
                        return (strcmp(s, tgt) == 0);
        }
        return (B_FALSE);
}

static char *
find_zpool(char **target, nvlist_t **configp, int dirc, char **dirv)
{
        nvlist_t *pools;
        nvlist_t *match = NULL;
        char *name = NULL;
        char *sepp = NULL;
        char sep = 0;
        int count = 0;
        importargs_t args = { 0 };

        args.paths = dirc;
        args.path = dirv;
        args.can_be_active = B_TRUE;

        if ((sepp = strpbrk(*target, "/@")) != NULL) {
                sep = *sepp;
                *sepp = '\0';
        }

        pools = zpool_search_import(g_zfs, &args);

        if (pools != NULL) {
                nvpair_t *elem = NULL;
                while ((elem = nvlist_next_nvpair(pools, elem)) != NULL) {
                        verify(nvpair_value_nvlist(elem, configp) == 0);
                        if (pool_match(*configp, *target)) {
                                count++;
                                if (match != NULL) {
                                        /* print previously found config */
                                        if (name != NULL) {
                                                (void) printf("%s\n", name);
                                                dump_nvlist(match, 8);
                                                name = NULL;
                                        }
                                        (void) printf("%s\n",
                                            nvpair_name(elem));
                                        dump_nvlist(*configp, 8);
                                } else {
                                        match = *configp;
                                        name = nvpair_name(elem);
                                }
                        }
                }
        }
        if (count > 1)
                (void) fatal("\tMatched %d pools - use pool GUID "
                    "instead of pool name or \n"
                    "\tpool name part of a dataset name to select pool", count);

        if (sepp)
                *sepp = sep;
        /*
         * If pool GUID was specified for pool id, replace it with pool name
         */
        if (name && (strstr(*target, name) != *target)) {
                int sz = 1 + strlen(name) + ((sepp) ? strlen(sepp) : 0);

                *target = umem_alloc(sz, UMEM_NOFAIL);
                (void) snprintf(*target, sz, "%s%s", name, sepp ? sepp : "");
        }

        *configp = name ? match : NULL;

        return (name);
}

int
main(int argc, char **argv)
{
        int i, c;
        struct rlimit rl = { 1024, 1024 };
        spa_t *spa = NULL;
        objset_t *os = NULL;
        int dump_all = 1;
        int verbose = 0;
        int error = 0;
        char **searchdirs = NULL;
        int nsearch = 0;
        char *target;
        nvlist_t *policy = NULL;
        uint64_t max_txg = UINT64_MAX;
        int rewind = ZPOOL_NEVER_REWIND;
        char *spa_config_path_env;

        (void) setrlimit(RLIMIT_NOFILE, &rl);
        (void) enable_extended_FILE_stdio(-1, -1);

        dprintf_setup(&argc, argv);

        /*
         * If there is an environment variable SPA_CONFIG_PATH it overrides
         * default spa_config_path setting. If -U flag is specified it will
         * override this environment variable settings once again.
         */
        spa_config_path_env = getenv("SPA_CONFIG_PATH");
        if (spa_config_path_env != NULL)
                spa_config_path = spa_config_path_env;

        while ((c = getopt(argc, argv, "bcdhilmM:suCDRSAFLXevp:t:U:P")) != -1) {
                switch (c) {
                case 'b':
                case 'c':
                case 'd':
                case 'h':
                case 'i':
                case 'l':
                case 'm':
                case 's':
                case 'u':
                case 'C':
                case 'D':
                case 'R':
                case 'S':
                        dump_opt[c]++;
                        dump_all = 0;
                        break;
                case 'A':
                case 'F':
                case 'L':
                case 'X':
                case 'e':
                case 'P':
                        dump_opt[c]++;
                        break;
                case 'v':
                        verbose++;
                        break;
                case 'M':
                        max_inflight = strtoull(optarg, NULL, 0);
                        if (max_inflight == 0) {
                                (void) fprintf(stderr, "maximum number "
                                    "of inflight I/Os must be greater "
                                    "than 0\n");
                                usage();
                        }
                        break;
                case 'p':
                        if (searchdirs == NULL) {
                                searchdirs = umem_alloc(sizeof (char *),
                                    UMEM_NOFAIL);
                        } else {
                                char **tmp = umem_alloc((nsearch + 1) *
                                    sizeof (char *), UMEM_NOFAIL);
                                bcopy(searchdirs, tmp, nsearch *
                                    sizeof (char *));
                                umem_free(searchdirs,
                                    nsearch * sizeof (char *));
                                searchdirs = tmp;
                        }
                        searchdirs[nsearch++] = optarg;
                        break;
                case 't':
                        max_txg = strtoull(optarg, NULL, 0);
                        if (max_txg < TXG_INITIAL) {
                                (void) fprintf(stderr, "incorrect txg "
                                    "specified: %s\n", optarg);
                                usage();
                        }
                        break;
                case 'U':
                        spa_config_path = optarg;
                        break;
                default:
                        usage();
                        break;
                }
        }

        if (!dump_opt['e'] && searchdirs != NULL) {
                (void) fprintf(stderr, "-p option requires use of -e\n");
                usage();
        }

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

        if (dump_all)
                verbose = MAX(verbose, 1);

        for (c = 0; c < 256; c++) {
                if (dump_all && !strchr("elAFLRSXP", c))
                        dump_opt[c] = 1;
                if (dump_opt[c])
                        dump_opt[c] += verbose;
        }

        aok = (dump_opt['A'] == 1) || (dump_opt['A'] > 2);
        zfs_recover = (dump_opt['A'] > 1);

        argc -= optind;
        argv += optind;

        if (argc < 2 && dump_opt['R'])
                usage();
        if (argc < 1) {
                if (!dump_opt['e'] && dump_opt['C']) {
                        dump_cachefile(spa_config_path);
                        return (0);
                }
                usage();
        }

        if (dump_opt['l']) {
                dump_label(argv[0]);
                return (0);
        }

        if (dump_opt['X'] || dump_opt['F'])
                rewind = ZPOOL_DO_REWIND |
                    (dump_opt['X'] ? ZPOOL_EXTREME_REWIND : 0);

        if (nvlist_alloc(&policy, NV_UNIQUE_NAME_TYPE, 0) != 0 ||
            nvlist_add_uint64(policy, ZPOOL_REWIND_REQUEST_TXG, max_txg) != 0 ||
            nvlist_add_uint32(policy, ZPOOL_REWIND_REQUEST, rewind) != 0)
                fatal("internal error: %s", strerror(ENOMEM));

        error = 0;
        target = argv[0];

        if (dump_opt['e']) {
                nvlist_t *cfg = NULL;
                char *name = find_zpool(&target, &cfg, nsearch, searchdirs);

                error = ENOENT;
                if (name) {
                        if (dump_opt['C'] > 1) {
                                (void) printf("\nConfiguration for import:\n");
                                dump_nvlist(cfg, 8);
                        }
                        if (nvlist_add_nvlist(cfg,
                            ZPOOL_REWIND_POLICY, policy) != 0) {
                                fatal("can't open '%s': %s",
                                    target, strerror(ENOMEM));
                        }
                        if ((error = spa_import(name, cfg, NULL,
                            ZFS_IMPORT_MISSING_LOG)) != 0) {
                                error = spa_import(name, cfg, NULL,
                                    ZFS_IMPORT_VERBATIM);
                        }
                }
        }

        if (error == 0) {
                if (strpbrk(target, "/@") == NULL || dump_opt['R']) {
                        error = spa_open_rewind(target, &spa, FTAG, policy,
                            NULL);
                        if (error) {
                                /*
                                 * If we're missing the log device then
                                 * try opening the pool after clearing the
                                 * log state.
                                 */
                                mutex_enter(&spa_namespace_lock);
                                if ((spa = spa_lookup(target)) != NULL &&
                                    spa->spa_log_state == SPA_LOG_MISSING) {
                                        spa->spa_log_state = SPA_LOG_CLEAR;
                                        error = 0;
                                }
                                mutex_exit(&spa_namespace_lock);

                                if (!error) {
                                        error = spa_open_rewind(target, &spa,
                                            FTAG, policy, NULL);
                                }
                        }
                } else {
                        error = dmu_objset_own(target, DMU_OST_ANY,
                            B_TRUE, FTAG, &os);
                }
        }
        nvlist_free(policy);

        if (error)
                fatal("can't open '%s': %s", target, strerror(error));

        argv++;
        argc--;
        if (!dump_opt['R']) {
                if (argc > 0) {
                        zopt_objects = argc;
                        zopt_object = calloc(zopt_objects, sizeof (uint64_t));
                        for (i = 0; i < zopt_objects; i++) {
                                errno = 0;
                                zopt_object[i] = strtoull(argv[i], NULL, 0);
                                if (zopt_object[i] == 0 && errno != 0)
                                        fatal("bad number %s: %s",
                                            argv[i], strerror(errno));
                        }
                }
                if (os != NULL) {
                        dump_dir(os);
                } else if (zopt_objects > 0 && !dump_opt['m']) {
                        dump_dir(spa->spa_meta_objset);
                } else {
                        dump_zpool(spa);
                }
        } else {
                flagbits['b'] = ZDB_FLAG_PRINT_BLKPTR;
                flagbits['c'] = ZDB_FLAG_CHECKSUM;
                flagbits['d'] = ZDB_FLAG_DECOMPRESS;
                flagbits['e'] = ZDB_FLAG_BSWAP;
                flagbits['g'] = ZDB_FLAG_GBH;
                flagbits['i'] = ZDB_FLAG_INDIRECT;
                flagbits['p'] = ZDB_FLAG_PHYS;
                flagbits['r'] = ZDB_FLAG_RAW;

                for (i = 0; i < argc; i++)
                        zdb_read_block(argv[i], spa);
        }

        (os != NULL) ? dmu_objset_disown(os, FTAG) : spa_close(spa, FTAG);

        fuid_table_destroy();
        sa_loaded = B_FALSE;

        libzfs_fini(g_zfs);
        kernel_fini();

        return (0);
}