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zfs_main.c

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

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

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <libgen.h>
#include <libintl.h>
#include <libuutil.h>
#include <libnvpair.h>
#include <locale.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <fcntl.h>
#include <zone.h>
#include <grp.h>
#include <pwd.h>
#include <sys/mkdev.h>
#include <sys/mntent.h>
#include <sys/mnttab.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/fs/zfs.h>

#include <libzfs.h>
#include <libuutil.h>

#include "zfs_iter.h"
#include "zfs_util.h"

libzfs_handle_t *g_zfs;

static FILE *mnttab_file;
static char history_str[HIS_MAX_RECORD_LEN];
const char *pypath = "/usr/lib/zfs/pyzfs.py";

static int zfs_do_clone(int argc, char **argv);
static int zfs_do_create(int argc, char **argv);
static int zfs_do_destroy(int argc, char **argv);
static int zfs_do_get(int argc, char **argv);
static int zfs_do_inherit(int argc, char **argv);
static int zfs_do_list(int argc, char **argv);
static int zfs_do_mount(int argc, char **argv);
static int zfs_do_rename(int argc, char **argv);
static int zfs_do_rollback(int argc, char **argv);
static int zfs_do_set(int argc, char **argv);
static int zfs_do_upgrade(int argc, char **argv);
static int zfs_do_snapshot(int argc, char **argv);
static int zfs_do_unmount(int argc, char **argv);
static int zfs_do_share(int argc, char **argv);
static int zfs_do_unshare(int argc, char **argv);
static int zfs_do_send(int argc, char **argv);
static int zfs_do_receive(int argc, char **argv);
static int zfs_do_promote(int argc, char **argv);
static int zfs_do_userspace(int argc, char **argv);
static int zfs_do_python(int argc, char **argv);

/*
 * Enable a reasonable set of defaults for libumem debugging on DEBUG builds.
 */

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

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

typedef enum {
      HELP_CLONE,
      HELP_CREATE,
      HELP_DESTROY,
      HELP_GET,
      HELP_INHERIT,
      HELP_UPGRADE,
      HELP_LIST,
      HELP_MOUNT,
      HELP_PROMOTE,
      HELP_RECEIVE,
      HELP_RENAME,
      HELP_ROLLBACK,
      HELP_SEND,
      HELP_SET,
      HELP_SHARE,
      HELP_SNAPSHOT,
      HELP_UNMOUNT,
      HELP_UNSHARE,
      HELP_ALLOW,
      HELP_UNALLOW,
      HELP_USERSPACE,
      HELP_GROUPSPACE
} zfs_help_t;

typedef struct zfs_command {
      const char  *name;
      int         (*func)(int argc, char **argv);
      zfs_help_t  usage;
} zfs_command_t;

/*
 * Master command table.  Each ZFS command has a name, associated function, and
 * usage message.  The usage messages need to be internationalized, so we have
 * to have a function to return the usage message based on a command index.
 *
 * These commands are organized according to how they are displayed in the usage
 * message.  An empty command (one with a NULL name) indicates an empty line in
 * the generic usage message.
 */
static zfs_command_t command_table[] = {
      { "create", zfs_do_create,          HELP_CREATE       },
      { "destroy",      zfs_do_destroy,         HELP_DESTROY            },
      { NULL },
      { "snapshot",     zfs_do_snapshot,  HELP_SNAPSHOT           },
      { "rollback",     zfs_do_rollback,  HELP_ROLLBACK           },
      { "clone",  zfs_do_clone,           HELP_CLONE        },
      { "promote",      zfs_do_promote,         HELP_PROMOTE            },
      { "rename", zfs_do_rename,          HELP_RENAME       },
      { NULL },
      { "list",   zfs_do_list,            HELP_LIST         },
      { NULL },
      { "set",    zfs_do_set,       HELP_SET          },
      { "get",    zfs_do_get,       HELP_GET          },
      { "inherit",      zfs_do_inherit,         HELP_INHERIT            },
      { "upgrade",      zfs_do_upgrade,         HELP_UPGRADE            },
      { "userspace",    zfs_do_userspace, HELP_USERSPACE          },
      { "groupspace",   zfs_do_userspace, HELP_GROUPSPACE         },
      { NULL },
      { "mount",  zfs_do_mount,           HELP_MOUNT        },
      { "unmount",      zfs_do_unmount,         HELP_UNMOUNT            },
      { "share",  zfs_do_share,           HELP_SHARE        },
      { "unshare",      zfs_do_unshare,         HELP_UNSHARE            },
      { NULL },
      { "send",   zfs_do_send,            HELP_SEND         },
      { "receive",      zfs_do_receive,         HELP_RECEIVE            },
      { NULL },
      { "allow",  zfs_do_python,          HELP_ALLOW        },
      { NULL },
      { "unallow",      zfs_do_python,          HELP_UNALLOW            },
};

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

zfs_command_t *current_command;

static const char *
get_usage(zfs_help_t idx)
{
      switch (idx) {
      case HELP_CLONE:
            return (gettext("\tclone [-p] [-o property=value] ... "
                "<snapshot> <filesystem|volume>\n"));
      case HELP_CREATE:
            return (gettext("\tcreate [-p] [-o property=value] ... "
                "<filesystem>\n"
                "\tcreate [-ps] [-b blocksize] [-o property=value] ... "
                "-V <size> <volume>\n"));
      case HELP_DESTROY:
            return (gettext("\tdestroy [-rRf] "
                "<filesystem|volume|snapshot>\n"));
      case HELP_GET:
            return (gettext("\tget [-rHp] [-d max] "
                "[-o field[,...]] [-s source[,...]]\n"
                "\t    <\"all\" | property[,...]> "
                "[filesystem|volume|snapshot] ...\n"));
      case HELP_INHERIT:
            return (gettext("\tinherit [-r] <property> "
                "<filesystem|volume|snapshot> ...\n"));
      case HELP_UPGRADE:
            return (gettext("\tupgrade [-v]\n"
                "\tupgrade [-r] [-V version] <-a | filesystem ...>\n"));
      case HELP_LIST:
            return (gettext("\tlist [-rH][-d max] "
                "[-o property[,...]] [-t type[,...]] [-s property] ...\n"
                "\t    [-S property] ... "
                "[filesystem|volume|snapshot] ...\n"));
      case HELP_MOUNT:
            return (gettext("\tmount\n"
                "\tmount [-vO] [-o opts] <-a | filesystem>\n"));
      case HELP_PROMOTE:
            return (gettext("\tpromote <clone-filesystem>\n"));
      case HELP_RECEIVE:
            return (gettext("\treceive [-vnF] <filesystem|volume|"
            "snapshot>\n"
            "\treceive [-vnF] -d <filesystem>\n"));
      case HELP_RENAME:
            return (gettext("\trename <filesystem|volume|snapshot> "
                "<filesystem|volume|snapshot>\n"
                "\trename -p <filesystem|volume> <filesystem|volume>\n"
                "\trename -r <snapshot> <snapshot>"));
      case HELP_ROLLBACK:
            return (gettext("\trollback [-rRf] <snapshot>\n"));
      case HELP_SEND:
            return (gettext("\tsend [-R] [-[iI] snapshot] <snapshot>\n"));
      case HELP_SET:
            return (gettext("\tset <property=value> "
                "<filesystem|volume|snapshot> ...\n"));
      case HELP_SHARE:
            return (gettext("\tshare <-a | filesystem>\n"));
      case HELP_SNAPSHOT:
            return (gettext("\tsnapshot [-r] [-o property=value] ... "
                "<filesystem@snapname|volume@snapname>\n"));
      case HELP_UNMOUNT:
            return (gettext("\tunmount [-f] "
                "<-a | filesystem|mountpoint>\n"));
      case HELP_UNSHARE:
            return (gettext("\tunshare [-f] "
                "<-a | filesystem|mountpoint>\n"));
      case HELP_ALLOW:
            return (gettext("\tallow <filesystem|volume>\n"
                "\tallow [-ldug] "
                "<\"everyone\"|user|group>[,...] <perm|@setname>[,...]\n"
                "\t    <filesystem|volume>\n"
                "\tallow [-ld] -e <perm|@setname>[,...] "
                "<filesystem|volume>\n"
                "\tallow -c <perm|@setname>[,...] <filesystem|volume>\n"
                "\tallow -s @setname <perm|@setname>[,...] "
                "<filesystem|volume>\n"));
      case HELP_UNALLOW:
            return (gettext("\tunallow [-rldug] "
                "<\"everyone\"|user|group>[,...]\n"
                "\t    [<perm|@setname>[,...]] <filesystem|volume>\n"
                "\tunallow [-rld] -e [<perm|@setname>[,...]] "
                "<filesystem|volume>\n"
                "\tunallow [-r] -c [<perm|@setname>[,...]] "
                "<filesystem|volume>\n"
                "\tunallow [-r] -s @setname [<perm|@setname>[,...]] "
                "<filesystem|volume>\n"));
      case HELP_USERSPACE:
            return (gettext("\tuserspace [-hniHp] [-o field[,...]] "
                "[-sS field] ... [-t type[,...]]\n"
                "\t    <filesystem|snapshot>\n"));
      case HELP_GROUPSPACE:
            return (gettext("\tgroupspace [-hniHpU] [-o field[,...]] "
                "[-sS field] ... [-t type[,...]]\n"
                "\t    <filesystem|snapshot>\n"));
      }

      abort();
      /* NOTREACHED */
}

/*
 * Utility function to guarantee malloc() success.
 */
void *
safe_malloc(size_t size)
{
      void *data;

      if ((data = calloc(1, size)) == NULL) {
            (void) fprintf(stderr, "internal error: out of memory\n");
            exit(1);
      }

      return (data);
}

/*
 * Callback routine that will print out information for each of
 * the properties.
 */
static int
usage_prop_cb(int prop, void *cb)
{
      FILE *fp = cb;

      (void) fprintf(fp, "\t%-15s ", zfs_prop_to_name(prop));

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

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

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

      return (ZPROP_CONT);
}

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

      if (current_command == NULL) {

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

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

            (void) fprintf(fp, gettext("\nEach dataset is of the form: "
                "pool/[dataset/]*dataset[@name]\n"));
      } else {
            (void) fprintf(fp, gettext("usage:\n"));
            (void) fprintf(fp, "%s", get_usage(current_command->usage));
      }

      if (current_command != NULL &&
          (strcmp(current_command->name, "set") == 0 ||
          strcmp(current_command->name, "get") == 0 ||
          strcmp(current_command->name, "inherit") == 0 ||
          strcmp(current_command->name, "list") == 0))
            show_properties = B_TRUE;

      if (show_properties) {
            (void) fprintf(fp,
                gettext("\nThe following properties are supported:\n"));

            (void) fprintf(fp, "\n\t%-14s %s  %s   %s\n\n",
                "PROPERTY", "EDIT", "INHERIT", "VALUES");

            /* Iterate over all properties */
            (void) zprop_iter(usage_prop_cb, fp, B_FALSE, B_TRUE,
                ZFS_TYPE_DATASET);

            (void) fprintf(fp, "\t%-15s ", "userused@...");
            (void) fprintf(fp, " NO       NO   <size>\n");
            (void) fprintf(fp, "\t%-15s ", "groupused@...");
            (void) fprintf(fp, " NO       NO   <size>\n");
            (void) fprintf(fp, "\t%-15s ", "userquota@...");
            (void) fprintf(fp, "YES       NO   <size> | none\n");
            (void) fprintf(fp, "\t%-15s ", "groupquota@...");
            (void) fprintf(fp, "YES       NO   <size> | none\n");

            (void) fprintf(fp, gettext("\nSizes are specified in bytes "
                "with standard units such as K, M, G, etc.\n"));
            (void) fprintf(fp, gettext("\nUser-defined properties can "
                "be specified by using a name containing a colon (:).\n"));
            (void) fprintf(fp, gettext("\nThe {user|group}{used|quota}@ "
                "properties must be appended with\n"
                "a user or group specifier of one of these forms:\n"
                "    POSIX name      (eg: \"matt\")\n"
                "    POSIX id        (eg: \"126829\")\n"
                "    SMB name@domain (eg: \"matt@sun\")\n"
                "    SMB SID         (eg: \"S-1-234-567-89\")\n"));
      } else {
            (void) fprintf(fp,
                gettext("\nFor the property list, run: %s\n"),
                "zfs set|get");
            (void) fprintf(fp,
                gettext("\nFor the delegated permission list, run: %s\n"),
                "zfs allow|unallow");
      }

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

      exit(requested ? 0 : 2);
}

static int
parseprop(nvlist_t *props)
{
      char *propname = optarg;
      char *propval, *strval;

      if ((propval = strchr(propname, '=')) == NULL) {
            (void) fprintf(stderr, gettext("missing "
                "'=' for -o option\n"));
            return (-1);
      }
      *propval = '\0';
      propval++;
      if (nvlist_lookup_string(props, propname, &strval) == 0) {
            (void) fprintf(stderr, gettext("property '%s' "
                "specified multiple times\n"), propname);
            return (-1);
      }
      if (nvlist_add_string(props, propname, propval) != 0) {
            (void) fprintf(stderr, gettext("internal "
                "error: out of memory\n"));
            return (-1);
      }
      return (0);
}

static int
parse_depth(char *opt, int *flags)
{
      char *tmp;
      int depth;

      depth = (int)strtol(opt, &tmp, 0);
      if (*tmp) {
            (void) fprintf(stderr,
                gettext("%s is not an integer\n"), optarg);
            usage(B_FALSE);
      }
      if (depth < 0) {
            (void) fprintf(stderr,
                gettext("Depth can not be negative.\n"));
            usage(B_FALSE);
      }
      *flags |= (ZFS_ITER_DEPTH_LIMIT|ZFS_ITER_RECURSE);
      return (depth);
}

/*
 * zfs clone [-p] [-o prop=value] ... <snap> <fs | vol>
 *
 * Given an existing dataset, create a writable copy whose initial contents
 * are the same as the source.  The newly created dataset maintains a
 * dependency on the original; the original cannot be destroyed so long as
 * the clone exists.
 *
 * The '-p' flag creates all the non-existing ancestors of the target first.
 */
static int
zfs_do_clone(int argc, char **argv)
{
      zfs_handle_t *zhp = NULL;
      boolean_t parents = B_FALSE;
      nvlist_t *props;
      int ret;
      int c;

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

      /* check options */
      while ((c = getopt(argc, argv, "o:p")) != -1) {
            switch (c) {
            case 'o':
                  if (parseprop(props))
                        return (1);
                  break;
            case 'p':
                  parents = B_TRUE;
                  break;
            case '?':
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  goto usage;
            }
      }

      argc -= optind;
      argv += optind;

      /* check number of arguments */
      if (argc < 1) {
            (void) fprintf(stderr, gettext("missing source dataset "
                "argument\n"));
            goto usage;
      }
      if (argc < 2) {
            (void) fprintf(stderr, gettext("missing target dataset "
                "argument\n"));
            goto usage;
      }
      if (argc > 2) {
            (void) fprintf(stderr, gettext("too many arguments\n"));
            goto usage;
      }

      /* open the source dataset */
      if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
            return (1);

      if (parents && zfs_name_valid(argv[1], ZFS_TYPE_FILESYSTEM |
          ZFS_TYPE_VOLUME)) {
            /*
             * Now create the ancestors of the target dataset.  If the
             * target already exists and '-p' option was used we should not
             * complain.
             */
            if (zfs_dataset_exists(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM |
                ZFS_TYPE_VOLUME))
                  return (0);
            if (zfs_create_ancestors(g_zfs, argv[1]) != 0)
                  return (1);
      }

      /* pass to libzfs */
      ret = zfs_clone(zhp, argv[1], props);

      /* create the mountpoint if necessary */
      if (ret == 0) {
            zfs_handle_t *clone;

            clone = zfs_open(g_zfs, argv[1], ZFS_TYPE_DATASET);
            if (clone != NULL) {
                  if ((ret = zfs_mount(clone, NULL, 0)) == 0)
                        ret = zfs_share(clone);
                  zfs_close(clone);
            }
      }

      zfs_close(zhp);
      nvlist_free(props);

      return (!!ret);

usage:
      if (zhp)
            zfs_close(zhp);
      nvlist_free(props);
      usage(B_FALSE);
      return (-1);
}

/*
 * zfs create [-p] [-o prop=value] ... fs
 * zfs create [-ps] [-b blocksize] [-o prop=value] ... -V vol size
 *
 * Create a new dataset.  This command can be used to create filesystems
 * and volumes.  Snapshot creation is handled by 'zfs snapshot'.
 * For volumes, the user must specify a size to be used.
 *
 * The '-s' flag applies only to volumes, and indicates that we should not try
 * to set the reservation for this volume.  By default we set a reservation
 * equal to the size for any volume.  For pools with SPA_VERSION >=
 * SPA_VERSION_REFRESERVATION, we set a refreservation instead.
 *
 * The '-p' flag creates all the non-existing ancestors of the target first.
 */
static int
zfs_do_create(int argc, char **argv)
{
      zfs_type_t type = ZFS_TYPE_FILESYSTEM;
      zfs_handle_t *zhp = NULL;
      uint64_t volsize;
      int c;
      boolean_t noreserve = B_FALSE;
      boolean_t bflag = B_FALSE;
      boolean_t parents = B_FALSE;
      int ret = 1;
      nvlist_t *props;
      uint64_t intval;
      int canmount;

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

      /* check options */
      while ((c = getopt(argc, argv, ":V:b:so:p")) != -1) {
            switch (c) {
            case 'V':
                  type = ZFS_TYPE_VOLUME;
                  if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
                        (void) fprintf(stderr, gettext("bad volume "
                            "size '%s': %s\n"), optarg,
                            libzfs_error_description(g_zfs));
                        goto error;
                  }

                  if (nvlist_add_uint64(props,
                      zfs_prop_to_name(ZFS_PROP_VOLSIZE),
                      intval) != 0) {
                        (void) fprintf(stderr, gettext("internal "
                            "error: out of memory\n"));
                        goto error;
                  }
                  volsize = intval;
                  break;
            case 'p':
                  parents = B_TRUE;
                  break;
            case 'b':
                  bflag = B_TRUE;
                  if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
                        (void) fprintf(stderr, gettext("bad volume "
                            "block size '%s': %s\n"), optarg,
                            libzfs_error_description(g_zfs));
                        goto error;
                  }

                  if (nvlist_add_uint64(props,
                      zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
                      intval) != 0) {
                        (void) fprintf(stderr, gettext("internal "
                            "error: out of memory\n"));
                        goto error;
                  }
                  break;
            case 'o':
                  if (parseprop(props))
                        goto error;
                  break;
            case 's':
                  noreserve = B_TRUE;
                  break;
            case ':':
                  (void) fprintf(stderr, gettext("missing size "
                      "argument\n"));
                  goto badusage;
                  break;
            case '?':
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  goto badusage;
            }
      }

      if ((bflag || noreserve) && type != ZFS_TYPE_VOLUME) {
            (void) fprintf(stderr, gettext("'-s' and '-b' can only be "
                "used when creating a volume\n"));
            goto badusage;
      }

      argc -= optind;
      argv += optind;

      /* check number of arguments */
      if (argc == 0) {
            (void) fprintf(stderr, gettext("missing %s argument\n"),
                zfs_type_to_name(type));
            goto badusage;
      }
      if (argc > 1) {
            (void) fprintf(stderr, gettext("too many arguments\n"));
            goto badusage;
      }

      if (type == ZFS_TYPE_VOLUME && !noreserve) {
            zpool_handle_t *zpool_handle;
            uint64_t spa_version;
            char *p;
            zfs_prop_t resv_prop;
            char *strval;

            if (p = strchr(argv[0], '/'))
                  *p = '\0';
            zpool_handle = zpool_open(g_zfs, argv[0]);
            if (p != NULL)
                  *p = '/';
            if (zpool_handle == NULL)
                  goto error;
            spa_version = zpool_get_prop_int(zpool_handle,
                ZPOOL_PROP_VERSION, NULL);
            zpool_close(zpool_handle);
            if (spa_version >= SPA_VERSION_REFRESERVATION)
                  resv_prop = ZFS_PROP_REFRESERVATION;
            else
                  resv_prop = ZFS_PROP_RESERVATION;

            if (nvlist_lookup_string(props, zfs_prop_to_name(resv_prop),
                &strval) != 0) {
                  if (nvlist_add_uint64(props,
                      zfs_prop_to_name(resv_prop), volsize) != 0) {
                        (void) fprintf(stderr, gettext("internal "
                            "error: out of memory\n"));
                        nvlist_free(props);
                        return (1);
                  }
            }
      }

      if (parents && zfs_name_valid(argv[0], type)) {
            /*
             * Now create the ancestors of target dataset.  If the target
             * already exists and '-p' option was used we should not
             * complain.
             */
            if (zfs_dataset_exists(g_zfs, argv[0], type)) {
                  ret = 0;
                  goto error;
            }
            if (zfs_create_ancestors(g_zfs, argv[0]) != 0)
                  goto error;
      }

      /* pass to libzfs */
      if (zfs_create(g_zfs, argv[0], type, props) != 0)
            goto error;

      if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == NULL)
            goto error;
      /*
       * if the user doesn't want the dataset automatically mounted,
       * then skip the mount/share step
       */

      canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);

      /*
       * Mount and/or share the new filesystem as appropriate.  We provide a
       * verbose error message to let the user know that their filesystem was
       * in fact created, even if we failed to mount or share it.
       */
      ret = 0;
      if (canmount == ZFS_CANMOUNT_ON) {
            if (zfs_mount(zhp, NULL, 0) != 0) {
                  (void) fprintf(stderr, gettext("filesystem "
                      "successfully created, but not mounted\n"));
                  ret = 1;
            } else if (zfs_share(zhp) != 0) {
                  (void) fprintf(stderr, gettext("filesystem "
                      "successfully created, but not shared\n"));
                  ret = 1;
            }
      }

error:
      if (zhp)
            zfs_close(zhp);
      nvlist_free(props);
      return (ret);
badusage:
      nvlist_free(props);
      usage(B_FALSE);
      return (2);
}

/*
 * zfs destroy [-rf] <fs, snap, vol>
 *
 *    -r    Recursively destroy all children
 *    -R    Recursively destroy all dependents, including clones
 *    -f    Force unmounting of any dependents
 *
 * Destroys the given dataset.  By default, it will unmount any filesystems,
 * and refuse to destroy a dataset that has any dependents.  A dependent can
 * either be a child, or a clone of a child.
 */
typedef struct destroy_cbdata {
      boolean_t   cb_first;
      int         cb_force;
      int         cb_recurse;
      int         cb_error;
      int         cb_needforce;
      int         cb_doclones;
      boolean_t   cb_closezhp;
      zfs_handle_t      *cb_target;
      char        *cb_snapname;
} destroy_cbdata_t;

/*
 * Check for any dependents based on the '-r' or '-R' flags.
 */
static int
destroy_check_dependent(zfs_handle_t *zhp, void *data)
{
      destroy_cbdata_t *cbp = data;
      const char *tname = zfs_get_name(cbp->cb_target);
      const char *name = zfs_get_name(zhp);

      if (strncmp(tname, name, strlen(tname)) == 0 &&
          (name[strlen(tname)] == '/' || name[strlen(tname)] == '@')) {
            /*
             * This is a direct descendant, not a clone somewhere else in
             * the hierarchy.
             */
            if (cbp->cb_recurse)
                  goto out;

            if (cbp->cb_first) {
                  (void) fprintf(stderr, gettext("cannot destroy '%s': "
                      "%s has children\n"),
                      zfs_get_name(cbp->cb_target),
                      zfs_type_to_name(zfs_get_type(cbp->cb_target)));
                  (void) fprintf(stderr, gettext("use '-r' to destroy "
                      "the following datasets:\n"));
                  cbp->cb_first = B_FALSE;
                  cbp->cb_error = 1;
            }

            (void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
      } else {
            /*
             * This is a clone.  We only want to report this if the '-r'
             * wasn't specified, or the target is a snapshot.
             */
            if (!cbp->cb_recurse &&
                zfs_get_type(cbp->cb_target) != ZFS_TYPE_SNAPSHOT)
                  goto out;

            if (cbp->cb_first) {
                  (void) fprintf(stderr, gettext("cannot destroy '%s': "
                      "%s has dependent clones\n"),
                      zfs_get_name(cbp->cb_target),
                      zfs_type_to_name(zfs_get_type(cbp->cb_target)));
                  (void) fprintf(stderr, gettext("use '-R' to destroy "
                      "the following datasets:\n"));
                  cbp->cb_first = B_FALSE;
                  cbp->cb_error = 1;
            }

            (void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
      }

out:
      zfs_close(zhp);
      return (0);
}

static int
destroy_callback(zfs_handle_t *zhp, void *data)
{
      destroy_cbdata_t *cbp = data;

      /*
       * Ignore pools (which we've already flagged as an error before getting
       * here.
       */
      if (strchr(zfs_get_name(zhp), '/') == NULL &&
          zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
            zfs_close(zhp);
            return (0);
      }

      /*
       * Bail out on the first error.
       */
      if (zfs_unmount(zhp, NULL, cbp->cb_force ? MS_FORCE : 0) != 0 ||
          zfs_destroy(zhp) != 0) {
            zfs_close(zhp);
            return (-1);
      }

      zfs_close(zhp);
      return (0);
}

static int
destroy_snap_clones(zfs_handle_t *zhp, void *arg)
{
      destroy_cbdata_t *cbp = arg;
      char thissnap[MAXPATHLEN];
      zfs_handle_t *szhp;
      boolean_t closezhp = cbp->cb_closezhp;
      int rv;

      (void) snprintf(thissnap, sizeof (thissnap),
          "%s@%s", zfs_get_name(zhp), cbp->cb_snapname);

      libzfs_print_on_error(g_zfs, B_FALSE);
      szhp = zfs_open(g_zfs, thissnap, ZFS_TYPE_SNAPSHOT);
      libzfs_print_on_error(g_zfs, B_TRUE);
      if (szhp) {
            /*
             * Destroy any clones of this snapshot
             */
            if (zfs_iter_dependents(szhp, B_FALSE, destroy_callback,
                cbp) != 0) {
                  zfs_close(szhp);
                  if (closezhp)
                        zfs_close(zhp);
                  return (-1);
            }
            zfs_close(szhp);
      }

      cbp->cb_closezhp = B_TRUE;
      rv = zfs_iter_filesystems(zhp, destroy_snap_clones, arg);
      if (closezhp)
            zfs_close(zhp);
      return (rv);
}

static int
zfs_do_destroy(int argc, char **argv)
{
      destroy_cbdata_t cb = { 0 };
      int c;
      zfs_handle_t *zhp;
      char *cp;

      /* check options */
      while ((c = getopt(argc, argv, "frR")) != -1) {
            switch (c) {
            case 'f':
                  cb.cb_force = 1;
                  break;
            case 'r':
                  cb.cb_recurse = 1;
                  break;
            case 'R':
                  cb.cb_recurse = 1;
                  cb.cb_doclones = 1;
                  break;
            case '?':
            default:
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  usage(B_FALSE);
            }
      }

      argc -= optind;
      argv += optind;

      /* check number of arguments */
      if (argc == 0) {
            (void) fprintf(stderr, gettext("missing path argument\n"));
            usage(B_FALSE);
      }
      if (argc > 1) {
            (void) fprintf(stderr, gettext("too many arguments\n"));
            usage(B_FALSE);
      }

      /*
       * If we are doing recursive destroy of a snapshot, then the
       * named snapshot may not exist.  Go straight to libzfs.
       */
      if (cb.cb_recurse && (cp = strchr(argv[0], '@'))) {
            int ret;

            *cp = '\0';
            if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == NULL)
                  return (1);
            *cp = '@';
            cp++;

            if (cb.cb_doclones) {
                  cb.cb_snapname = cp;
                  if (destroy_snap_clones(zhp, &cb) != 0) {
                        zfs_close(zhp);
                        return (1);
                  }
            }

            ret = zfs_destroy_snaps(zhp, cp);
            zfs_close(zhp);
            if (ret) {
                  (void) fprintf(stderr,
                      gettext("no snapshots destroyed\n"));
            }
            return (ret != 0);
      }


      /* Open the given dataset */
      if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == NULL)
            return (1);

      cb.cb_target = zhp;

      /*
       * Perform an explicit check for pools before going any further.
       */
      if (!cb.cb_recurse && strchr(zfs_get_name(zhp), '/') == NULL &&
          zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
            (void) fprintf(stderr, gettext("cannot destroy '%s': "
                "operation does not apply to pools\n"),
                zfs_get_name(zhp));
            (void) fprintf(stderr, gettext("use 'zfs destroy -r "
                "%s' to destroy all datasets in the pool\n"),
                zfs_get_name(zhp));
            (void) fprintf(stderr, gettext("use 'zpool destroy %s' "
                "to destroy the pool itself\n"), zfs_get_name(zhp));
            zfs_close(zhp);
            return (1);
      }

      /*
       * Check for any dependents and/or clones.
       */
      cb.cb_first = B_TRUE;
      if (!cb.cb_doclones &&
          zfs_iter_dependents(zhp, B_TRUE, destroy_check_dependent,
          &cb) != 0) {
            zfs_close(zhp);
            return (1);
      }

      if (cb.cb_error ||
          zfs_iter_dependents(zhp, B_FALSE, destroy_callback, &cb) != 0) {
            zfs_close(zhp);
            return (1);
      }

      /*
       * Do the real thing.  The callback will close the handle regardless of
       * whether it succeeds or not.
       */

      if (destroy_callback(zhp, &cb) != 0)
            return (1);


      return (0);
}

/*
 * zfs get [-rHp] [-o field[,field]...] [-s source[,source]...]
 *    < all | property[,property]... > < fs | snap | vol > ...
 *
 *    -r    recurse over any child datasets
 *    -H    scripted mode.  Headers are stripped, and fields are separated
 *          by tabs instead of spaces.
 *    -o    Set of fields to display.  One of "name,property,value,source".
 *          Default is all four.
 *    -s    Set of sources to allow.  One of
 *          "local,default,inherited,temporary,none".  Default is all
 *          five.
 *    -p    Display values in parsable (literal) format.
 *
 *  Prints properties for the given datasets.  The user can control which
 *  columns to display as well as which property types to allow.
 */

/*
 * Invoked to display the properties for a single dataset.
 */
static int
get_callback(zfs_handle_t *zhp, void *data)
{
      char buf[ZFS_MAXPROPLEN];
      zprop_source_t sourcetype;
      char source[ZFS_MAXNAMELEN];
      zprop_get_cbdata_t *cbp = data;
      nvlist_t *userprop = zfs_get_user_props(zhp);
      zprop_list_t *pl = cbp->cb_proplist;
      nvlist_t *propval;
      char *strval;
      char *sourceval;

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

            if (pl->pl_prop != ZPROP_INVAL) {
                  if (zfs_prop_get(zhp, pl->pl_prop, buf,
                      sizeof (buf), &sourcetype, source,
                      sizeof (source),
                      cbp->cb_literal) != 0) {
                        if (pl->pl_all)
                              continue;
                        if (!zfs_prop_valid_for_type(pl->pl_prop,
                            ZFS_TYPE_DATASET)) {
                              (void) fprintf(stderr,
                                  gettext("No such property '%s'\n"),
                                  zfs_prop_to_name(pl->pl_prop));
                              continue;
                        }
                        sourcetype = ZPROP_SRC_NONE;
                        (void) strlcpy(buf, "-", sizeof (buf));
                  }

                  zprop_print_one_property(zfs_get_name(zhp), cbp,
                      zfs_prop_to_name(pl->pl_prop),
                      buf, sourcetype, source);
            } else if (zfs_prop_userquota(pl->pl_user_prop)) {
                  sourcetype = ZPROP_SRC_LOCAL;

                  if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
                      buf, sizeof (buf), cbp->cb_literal) != 0) {
                        sourcetype = ZPROP_SRC_NONE;
                        (void) strlcpy(buf, "-", sizeof (buf));
                  }

                  zprop_print_one_property(zfs_get_name(zhp), cbp,
                      pl->pl_user_prop, buf, sourcetype, source);
            } else {
                  if (nvlist_lookup_nvlist(userprop,
                      pl->pl_user_prop, &propval) != 0) {
                        if (pl->pl_all)
                              continue;
                        sourcetype = ZPROP_SRC_NONE;
                        strval = "-";
                  } else {
                        verify(nvlist_lookup_string(propval,
                            ZPROP_VALUE, &strval) == 0);
                        verify(nvlist_lookup_string(propval,
                            ZPROP_SOURCE, &sourceval) == 0);

                        if (strcmp(sourceval,
                            zfs_get_name(zhp)) == 0) {
                              sourcetype = ZPROP_SRC_LOCAL;
                        } else {
                              sourcetype = ZPROP_SRC_INHERITED;
                              (void) strlcpy(source,
                                  sourceval, sizeof (source));
                        }
                  }

                  zprop_print_one_property(zfs_get_name(zhp), cbp,
                      pl->pl_user_prop, strval, sourcetype,
                      source);
            }
      }

      return (0);
}

static int
zfs_do_get(int argc, char **argv)
{
      zprop_get_cbdata_t cb = { 0 };
      int i, c, flags = 0;
      char *value, *fields;
      int ret;
      int limit = 0;
      zprop_list_t fake_name = { 0 };

      /*
       * Set up default columns and sources.
       */
      cb.cb_sources = ZPROP_SRC_ALL;
      cb.cb_columns[0] = GET_COL_NAME;
      cb.cb_columns[1] = GET_COL_PROPERTY;
      cb.cb_columns[2] = GET_COL_VALUE;
      cb.cb_columns[3] = GET_COL_SOURCE;
      cb.cb_type = ZFS_TYPE_DATASET;

      /* check options */
      while ((c = getopt(argc, argv, ":d:o:s:rHp")) != -1) {
            switch (c) {
            case 'p':
                  cb.cb_literal = B_TRUE;
                  break;
            case 'd':
                  limit = parse_depth(optarg, &flags);
                  break;
            case 'r':
                  flags |= ZFS_ITER_RECURSE;
                  break;
            case 'H':
                  cb.cb_scripted = B_TRUE;
                  break;
            case ':':
                  (void) fprintf(stderr, gettext("missing argument for "
                      "'%c' option\n"), optopt);
                  usage(B_FALSE);
                  break;
            case 'o':
                  /*
                   * Process the set of columns to display.  We zero out
                   * the structure to give us a blank slate.
                   */
                  bzero(&cb.cb_columns, sizeof (cb.cb_columns));
                  i = 0;
                  while (*optarg != '\0') {
                        static char *col_subopts[] =
                            { "name", "property", "value", "source",
                            NULL };

                        if (i == 4) {
                              (void) fprintf(stderr, gettext("too "
                                  "many fields given to -o "
                                  "option\n"));
                              usage(B_FALSE);
                        }

                        switch (getsubopt(&optarg, col_subopts,
                            &value)) {
                        case 0:
                              cb.cb_columns[i++] = GET_COL_NAME;
                              break;
                        case 1:
                              cb.cb_columns[i++] = GET_COL_PROPERTY;
                              break;
                        case 2:
                              cb.cb_columns[i++] = GET_COL_VALUE;
                              break;
                        case 3:
                              cb.cb_columns[i++] = GET_COL_SOURCE;
                              break;
                        default:
                              (void) fprintf(stderr,
                                  gettext("invalid column name "
                                  "'%s'\n"), value);
                              usage(B_FALSE);
                        }
                  }
                  break;

            case 's':
                  cb.cb_sources = 0;
                  while (*optarg != '\0') {
                        static char *source_subopts[] = {
                              "local", "default", "inherited",
                              "temporary", "none", NULL };

                        switch (getsubopt(&optarg, source_subopts,
                            &value)) {
                        case 0:
                              cb.cb_sources |= ZPROP_SRC_LOCAL;
                              break;
                        case 1:
                              cb.cb_sources |= ZPROP_SRC_DEFAULT;
                              break;
                        case 2:
                              cb.cb_sources |= ZPROP_SRC_INHERITED;
                              break;
                        case 3:
                              cb.cb_sources |= ZPROP_SRC_TEMPORARY;
                              break;
                        case 4:
                              cb.cb_sources |= ZPROP_SRC_NONE;
                              break;
                        default:
                              (void) fprintf(stderr,
                                  gettext("invalid source "
                                  "'%s'\n"), value);
                              usage(B_FALSE);
                        }
                  }
                  break;

            case '?':
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  usage(B_FALSE);
            }
      }

      argc -= optind;
      argv += optind;

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

      fields = argv[0];

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

      argc--;
      argv++;

      /*
       * As part of zfs_expand_proplist(), we keep track of the maximum column
       * width for each property.  For the 'NAME' (and 'SOURCE') columns, we
       * need to know the maximum name length.  However, the user likely did
       * not specify 'name' as one of the properties to fetch, so we need to
       * make sure we always include at least this property for
       * print_get_headers() to work properly.
       */
      if (cb.cb_proplist != NULL) {
            fake_name.pl_prop = ZFS_PROP_NAME;
            fake_name.pl_width = strlen(gettext("NAME"));
            fake_name.pl_next = cb.cb_proplist;
            cb.cb_proplist = &fake_name;
      }

      cb.cb_first = B_TRUE;

      /* run for each object */
      ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET, NULL,
          &cb.cb_proplist, limit, get_callback, &cb);

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

      return (ret);
}

/*
 * inherit [-r] <property> <fs|vol> ...
 *
 *    -r    Recurse over all children
 *
 * For each dataset specified on the command line, inherit the given property
 * from its parent.  Inheriting a property at the pool level will cause it to
 * use the default value.  The '-r' flag will recurse over all children, and is
 * useful for setting a property on a hierarchy-wide basis, regardless of any
 * local modifications for each dataset.
 */

static int
inherit_recurse_cb(zfs_handle_t *zhp, void *data)
{
      char *propname = data;
      zfs_prop_t prop = zfs_name_to_prop(propname);

      /*
       * If we're doing it recursively, then ignore properties that
       * are not valid for this type of dataset.
       */
      if (prop != ZPROP_INVAL &&
          !zfs_prop_valid_for_type(prop, zfs_get_type(zhp)))
            return (0);

      return (zfs_prop_inherit(zhp, propname) != 0);
}

static int
inherit_cb(zfs_handle_t *zhp, void *data)
{
      char *propname = data;

      return (zfs_prop_inherit(zhp, propname) != 0);
}

static int
zfs_do_inherit(int argc, char **argv)
{
      int c;
      zfs_prop_t prop;
      char *propname;
      int ret;
      int flags = 0;

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

      argc -= optind;
      argv += optind;

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

      propname = argv[0];
      argc--;
      argv++;

      if ((prop = zfs_name_to_prop(propname)) != ZPROP_INVAL) {
            if (zfs_prop_readonly(prop)) {
                  (void) fprintf(stderr, gettext(
                      "%s property is read-only\n"),
                      propname);
                  return (1);
            }
            if (!zfs_prop_inheritable(prop)) {
                  (void) fprintf(stderr, gettext("'%s' property cannot "
                      "be inherited\n"), propname);
                  if (prop == ZFS_PROP_QUOTA ||
                      prop == ZFS_PROP_RESERVATION ||
                      prop == ZFS_PROP_REFQUOTA ||
                      prop == ZFS_PROP_REFRESERVATION)
                        (void) fprintf(stderr, gettext("use 'zfs set "
                            "%s=none' to clear\n"), propname);
                  return (1);
            }
      } else if (!zfs_prop_user(propname)) {
            (void) fprintf(stderr, gettext("invalid property '%s'\n"),
                propname);
            usage(B_FALSE);
      }

      if (flags & ZFS_ITER_RECURSE) {
            ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
                NULL, NULL, 0, inherit_recurse_cb, propname);
      } else {
            ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
                NULL, NULL, 0, inherit_cb, propname);
      }

      return (ret);
}

typedef struct upgrade_cbdata {
      uint64_t cb_numupgraded;
      uint64_t cb_numsamegraded;
      uint64_t cb_numfailed;
      uint64_t cb_version;
      boolean_t cb_newer;
      boolean_t cb_foundone;
      char cb_lastfs[ZFS_MAXNAMELEN];
} upgrade_cbdata_t;

static int
same_pool(zfs_handle_t *zhp, const char *name)
{
      int len1 = strcspn(name, "/@");
      const char *zhname = zfs_get_name(zhp);
      int len2 = strcspn(zhname, "/@");

      if (len1 != len2)
            return (B_FALSE);
      return (strncmp(name, zhname, len1) == 0);
}

static int
upgrade_list_callback(zfs_handle_t *zhp, void *data)
{
      upgrade_cbdata_t *cb = data;
      int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);

      /* list if it's old/new */
      if ((!cb->cb_newer && version < ZPL_VERSION) ||
          (cb->cb_newer && version > ZPL_VERSION)) {
            char *str;
            if (cb->cb_newer) {
                  str = gettext("The following filesystems are "
                      "formatted using a newer software version and\n"
                      "cannot be accessed on the current system.\n\n");
            } else {
                  str = gettext("The following filesystems are "
                      "out of date, and can be upgraded.  After being\n"
                      "upgraded, these filesystems (and any 'zfs send' "
                      "streams generated from\n"
                      "subsequent snapshots) will no longer be "
                      "accessible by older software versions.\n\n");
            }

            if (!cb->cb_foundone) {
                  (void) puts(str);
                  (void) printf(gettext("VER  FILESYSTEM\n"));
                  (void) printf(gettext("---  ------------\n"));
                  cb->cb_foundone = B_TRUE;
            }

            (void) printf("%2u   %s\n", version, zfs_get_name(zhp));
      }

      return (0);
}

static int
upgrade_set_callback(zfs_handle_t *zhp, void *data)
{
      upgrade_cbdata_t *cb = data;
      int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
      int i;
      static struct { int zplver; int spaver; } table[] = {
            {ZPL_VERSION_FUID, SPA_VERSION_FUID},
            {ZPL_VERSION_USERSPACE, SPA_VERSION_USERSPACE},
            {0, 0}
      };


      for (i = 0; table[i].zplver; i++) {
            if (cb->cb_version >= table[i].zplver) {
                  int spa_version;

                  if (zfs_spa_version(zhp, &spa_version) < 0)
                        return (-1);

                  if (spa_version < table[i].spaver) {
                        /* can't upgrade */
                        (void) printf(gettext("%s: can not be "
                            "upgraded; the pool version needs to first "
                            "be upgraded\nto version %llu\n\n"),
                            zfs_get_name(zhp), (long long unsigned int) table[i].spaver);
                        cb->cb_numfailed++;
                        return (0);
                  }
            }
      }

      /* upgrade */
      if (version < cb->cb_version) {
            char verstr[16];
            (void) snprintf(verstr, sizeof (verstr),
                "%llu", (u_longlong_t) cb->cb_version);
            if (cb->cb_lastfs[0] && !same_pool(zhp, cb->cb_lastfs)) {
                  /*
                   * If they did "zfs upgrade -a", then we could
                   * be doing ioctls to different pools.  We need
                   * to log this history once to each pool.
                   */
                  verify(zpool_stage_history(g_zfs, history_str) == 0);
            }
            if (zfs_prop_set(zhp, "version", verstr) == 0)
                  cb->cb_numupgraded++;
            else
                  cb->cb_numfailed++;
            (void) strcpy(cb->cb_lastfs, zfs_get_name(zhp));
      } else if (version > cb->cb_version) {
            /* can't downgrade */
            (void) printf(gettext("%s: can not be downgraded; "
                "it is already at version %u\n"),
                zfs_get_name(zhp), version);
            cb->cb_numfailed++;
      } else {
            cb->cb_numsamegraded++;
      }
      return (0);
}

/*
 * zfs upgrade
 * zfs upgrade -v
 * zfs upgrade [-r] [-V <version>] <-a | filesystem>
 */
static int
zfs_do_upgrade(int argc, char **argv)
{
      boolean_t all = B_FALSE;
      boolean_t showversions = B_FALSE;
      int ret;
      upgrade_cbdata_t cb = { 0 };
      int c;
      int flags = ZFS_ITER_ARGS_CAN_BE_PATHS;

      /* check options */
      while ((c = getopt(argc, argv, "rvV:a")) != -1) {
            switch (c) {
            case 'r':
                  flags |= ZFS_ITER_RECURSE;
                  break;
            case 'v':
                  showversions = B_TRUE;
                  break;
            case 'V':
                  if (zfs_prop_string_to_index(ZFS_PROP_VERSION,
                      optarg, &cb.cb_version) != 0) {
                        (void) fprintf(stderr,
                            gettext("invalid version %s\n"), optarg);
                        usage(B_FALSE);
                  }
                  break;
            case 'a':
                  all = B_TRUE;
                  break;
            case '?':
            default:
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  usage(B_FALSE);
            }
      }

      argc -= optind;
      argv += optind;

      if ((!all && !argc) && ((flags & ZFS_ITER_RECURSE) | cb.cb_version))
            usage(B_FALSE);
      if (showversions && (flags & ZFS_ITER_RECURSE || all ||
          cb.cb_version || argc))
            usage(B_FALSE);
      if ((all || argc) && (showversions))
            usage(B_FALSE);
      if (all && argc)
            usage(B_FALSE);

      if (showversions) {
            /* Show info on available versions. */
            (void) printf(gettext("The following filesystem versions are "
                "supported:\n\n"));
            (void) printf(gettext("VER  DESCRIPTION\n"));
            (void) printf("---  -----------------------------------------"
                "---------------\n");
            (void) printf(gettext(" 1   Initial ZFS filesystem version\n"));
            (void) printf(gettext(" 2   Enhanced directory entries\n"));
            (void) printf(gettext(" 3   Case insensitive and File system "
                "unique identifer (FUID)\n"));
            (void) printf(gettext(" 4   userquota, groupquota "
                "properties\n"));
            (void) printf(gettext("\nFor more information on a particular "
                "version, including supported releases, see:\n\n"));
            (void) printf("http://www.opensolaris.org/os/community/zfs/"
                "version/zpl/N\n\n");
            (void) printf(gettext("Where 'N' is the version number.\n"));
            ret = 0;
      } else if (argc || all) {
            /* Upgrade filesystems */
            if (cb.cb_version == 0)
                  cb.cb_version = ZPL_VERSION;
            ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_FILESYSTEM,
                NULL, NULL, 0, upgrade_set_callback, &cb);
            (void) printf(gettext("%llu filesystems upgraded\n"),
                (u_longlong_t) cb.cb_numupgraded);
            if (cb.cb_numsamegraded) {
                  (void) printf(gettext("%llu filesystems already at "
                      "this version\n"),
                      (u_longlong_t) cb.cb_numsamegraded);
            }
            if (cb.cb_numfailed != 0)
                  ret = 1;
      } else {
            /* List old-version filesytems */
            boolean_t found;
            (void) printf(gettext("This system is currently running "
                "ZFS filesystem version %llu.\n\n"), ZPL_VERSION);

            flags |= ZFS_ITER_RECURSE;
            ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
                NULL, NULL, 0, upgrade_list_callback, &cb);

            found = cb.cb_foundone;
            cb.cb_foundone = B_FALSE;
            cb.cb_newer = B_TRUE;

            ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
                NULL, NULL, 0, upgrade_list_callback, &cb);

            if (!cb.cb_foundone && !found) {
                  (void) printf(gettext("All filesystems are "
                      "formatted with the current version.\n"));
            }
      }

      return (ret);
}

/*
 * zfs userspace
 */
static int
userspace_cb(void *arg, const char *domain, uid_t rid, uint64_t space)
{
      zfs_userquota_prop_t *typep = arg;
      zfs_userquota_prop_t p = *typep;
      char *name = NULL;
      char *ug, *propname;
      char namebuf[32];
      char sizebuf[32];

      if (domain == NULL || domain[0] == '\0') {
            if (p == ZFS_PROP_GROUPUSED || p == ZFS_PROP_GROUPQUOTA) {
                  struct group *g = getgrgid(rid);
                  if (g)
                        name = g->gr_name;
            } else {
                  struct passwd *p = getpwuid(rid);
                  if (p)
                        name = p->pw_name;
            }
      }

      if (p == ZFS_PROP_GROUPUSED || p == ZFS_PROP_GROUPQUOTA)
            ug = "group";
      else
            ug = "user";

      if (p == ZFS_PROP_USERUSED || p == ZFS_PROP_GROUPUSED)
            propname = "used";
      else
            propname = "quota";

      if (name == NULL) {
            (void) snprintf(namebuf, sizeof (namebuf),
                "%llu", (longlong_t)rid);
            name = namebuf;
      }
      zfs_nicenum(space, sizebuf, sizeof (sizebuf));

      (void) printf("%s %s %s%c%s %s\n", propname, ug, domain,
          domain[0] ? '-' : ' ', name, sizebuf);

      return (0);
}

static int
zfs_do_userspace(int argc, char **argv)
{
      zfs_handle_t *zhp;
      zfs_userquota_prop_t p;
      int error;

      /*
       * Try the python version.  If the execv fails, we'll continue
       * and do a simplistic implementation.
       */
      (void) execv(pypath, argv-1);

      (void) printf("internal error: %s not found\n"
          "falling back on built-in implementation, "
          "some features will not work\n", pypath);

      if ((zhp = zfs_open(g_zfs, argv[argc-1], ZFS_TYPE_DATASET)) == NULL)
            return (1);

      (void) printf("PROP TYPE NAME VALUE\n");

      for (p = 0; p < ZFS_NUM_USERQUOTA_PROPS; p++) {
            error = zfs_userspace(zhp, p, userspace_cb, &p);
            if (error)
                  break;
      }
      return (error);
}

/*
 * list [-r][-d max] [-H] [-o property[,property]...] [-t type[,type]...]
 *      [-s property [-s property]...] [-S property [-S property]...]
 *      <dataset> ...
 *
 *    -r    Recurse over all children
 *    -d    Limit recursion by depth.
 *    -H    Scripted mode; elide headers and separate columns by tabs
 *    -o    Control which fields to display.
 *    -t    Control which object types to display.
 *    -s    Specify sort columns, descending order.
 *    -S    Specify sort columns, ascending order.
 *
 * When given no arguments, lists all filesystems in the system.
 * Otherwise, list the specified datasets, optionally recursing down them if
 * '-r' is specified.
 */
typedef struct list_cbdata {
      boolean_t   cb_first;
      boolean_t   cb_scripted;
      zprop_list_t      *cb_proplist;
} list_cbdata_t;

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

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

            right_justify = B_FALSE;
            if (pl->pl_prop != ZPROP_INVAL) {
                  header = zfs_prop_column_name(pl->pl_prop);
                  right_justify = zfs_prop_align_right(pl->pl_prop);
            } else {
                  for (i = 0; pl->pl_user_prop[i] != '\0'; i++)
                        headerbuf[i] = toupper(pl->pl_user_prop[i]);
                  headerbuf[i] = '\0';
                  header = headerbuf;
            }

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

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

/*
 * Given a dataset and a list of fields, print out all the properties according
 * to the described layout.
 */
static void
print_dataset(zfs_handle_t *zhp, zprop_list_t *pl, boolean_t scripted)
{
      boolean_t first = B_TRUE;
      char property[ZFS_MAXPROPLEN];
      nvlist_t *userprops = zfs_get_user_props(zhp);
      nvlist_t *propval;
      char *propstr;
      boolean_t right_justify;
      int width;

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

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

                  right_justify = zfs_prop_align_right(pl->pl_prop);
            } else if (zfs_prop_userquota(pl->pl_user_prop)) {
                  if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
                      property, sizeof (property), B_FALSE) != 0)
                        propstr = "-";
                  else
                        propstr = property;
                  right_justify = B_TRUE;
            } else {
                  if (nvlist_lookup_nvlist(userprops,
                      pl->pl_user_prop, &propval) != 0)
                        propstr = "-";
                  else
                        verify(nvlist_lookup_string(propval,
                            ZPROP_VALUE, &propstr) == 0);
                  right_justify = B_FALSE;
            }

            width = pl->pl_width;

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

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

/*
 * Generic callback function to list a dataset or snapshot.
 */
static int
list_callback(zfs_handle_t *zhp, void *data)
{
      list_cbdata_t *cbp = data;

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

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

      return (0);
}

static int
zfs_do_list(int argc, char **argv)
{
      int c;
      boolean_t scripted = B_FALSE;
      static char default_fields[] =
          "name,used,available,referenced,mountpoint";
      int types = ZFS_TYPE_DATASET;
      boolean_t types_specified = B_FALSE;
      char *fields = NULL;
      list_cbdata_t cb = { 0 };
      char *value;
      int limit = 0;
      int ret;
      zfs_sort_column_t *sortcol = NULL;
      int flags = ZFS_ITER_PROP_LISTSNAPS | ZFS_ITER_ARGS_CAN_BE_PATHS;

      /* check options */
      while ((c = getopt(argc, argv, ":d:o:rt:Hs:S:")) != -1) {
            switch (c) {
            case 'o':
                  fields = optarg;
                  break;
            case 'd':
                  limit = parse_depth(optarg, &flags);
                  break;
            case 'r':
                  flags |= ZFS_ITER_RECURSE;
                  break;
            case 'H':
                  scripted = B_TRUE;
                  break;
            case 's':
                  if (zfs_add_sort_column(&sortcol, optarg,
                      B_FALSE) != 0) {
                        (void) fprintf(stderr,
                            gettext("invalid property '%s'\n"), optarg);
                        usage(B_FALSE);
                  }
                  break;
            case 'S':
                  if (zfs_add_sort_column(&sortcol, optarg,
                      B_TRUE) != 0) {
                        (void) fprintf(stderr,
                            gettext("invalid property '%s'\n"), optarg);
                        usage(B_FALSE);
                  }
                  break;
            case 't':
                  types = 0;
                  types_specified = B_TRUE;
                  flags &= ~ZFS_ITER_PROP_LISTSNAPS;
                  while (*optarg != '\0') {
                        static char *type_subopts[] = { "filesystem",
                            "volume", "snapshot", "all", NULL };

                        switch (getsubopt(&optarg, type_subopts,
                            &value)) {
                        case 0:
                              types |= ZFS_TYPE_FILESYSTEM;
                              break;
                        case 1:
                              types |= ZFS_TYPE_VOLUME;
                              break;
                        case 2:
                              types |= ZFS_TYPE_SNAPSHOT;
                              break;
                        case 3:
                              types = ZFS_TYPE_DATASET;
                              break;

                        default:
                              (void) fprintf(stderr,
                                  gettext("invalid type '%s'\n"),
                                  value);
                              usage(B_FALSE);
                        }
                  }
                  break;
            case ':':
                  (void) fprintf(stderr, gettext("missing argument for "
                      "'%c' option\n"), optopt);
                  usage(B_FALSE);
                  break;
            case '?':
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  usage(B_FALSE);
            }
      }

      argc -= optind;
      argv += optind;

      if (fields == NULL)
            fields = default_fields;

      /*
       * If "-o space" and no types were specified, don't display snapshots.
       */
      if (strcmp(fields, "space") == 0 && types_specified == B_FALSE)
            types &= ~ZFS_TYPE_SNAPSHOT;

      /*
       * If the user specifies '-o all', the zprop_get_list() doesn't
       * normally include the name of the dataset.  For 'zfs list', we always
       * want this property to be first.
       */
      if (zprop_get_list(g_zfs, fields, &cb.cb_proplist, ZFS_TYPE_DATASET)
          != 0)
            usage(B_FALSE);

      cb.cb_scripted = scripted;
      cb.cb_first = B_TRUE;

      ret = zfs_for_each(argc, argv, flags, types, sortcol, &cb.cb_proplist,
          limit, list_callback, &cb);

      zprop_free_list(cb.cb_proplist);
      zfs_free_sort_columns(sortcol);

      if (ret == 0 && cb.cb_first && !cb.cb_scripted)
            (void) printf(gettext("no datasets available\n"));

      return (ret);
}

/*
 * zfs rename <fs | snap | vol> <fs | snap | vol>
 * zfs rename -p <fs | vol> <fs | vol>
 * zfs rename -r <snap> <snap>
 *
 * Renames the given dataset to another of the same type.
 *
 * The '-p' flag creates all the non-existing ancestors of the target first.
 */
/* ARGSUSED */
static int
zfs_do_rename(int argc, char **argv)
{
      zfs_handle_t *zhp;
      int c;
      int ret;
      boolean_t recurse = B_FALSE;
      boolean_t parents = B_FALSE;

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

      argc -= optind;
      argv += optind;

      /* check number of arguments */
      if (argc < 1) {
            (void) fprintf(stderr, gettext("missing source dataset "
                "argument\n"));
            usage(B_FALSE);
      }
      if (argc < 2) {
            (void) fprintf(stderr, gettext("missing target dataset "
                "argument\n"));
            usage(B_FALSE);
      }
      if (argc > 2) {
            (void) fprintf(stderr, gettext("too many arguments\n"));
            usage(B_FALSE);
      }

      if (recurse && parents) {
            (void) fprintf(stderr, gettext("-p and -r options are mutually "
                "exclusive\n"));
            usage(B_FALSE);
      }

      if (recurse && strchr(argv[0], '@') == 0) {
            (void) fprintf(stderr, gettext("source dataset for recursive "
                "rename must be a snapshot\n"));
            usage(B_FALSE);
      }

      if ((zhp = zfs_open(g_zfs, argv[0], parents ? ZFS_TYPE_FILESYSTEM |
          ZFS_TYPE_VOLUME : ZFS_TYPE_DATASET)) == NULL)
            return (1);

      /* If we were asked and the name looks good, try to create ancestors. */
      if (parents && zfs_name_valid(argv[1], zfs_get_type(zhp)) &&
          zfs_create_ancestors(g_zfs, argv[1]) != 0) {
            zfs_close(zhp);
            return (1);
      }

      ret = (zfs_rename(zhp, argv[1], recurse) != 0);

      zfs_close(zhp);
      return (ret);
}

/*
 * zfs promote <fs>
 *
 * Promotes the given clone fs to be the parent
 */
/* ARGSUSED */
static int
zfs_do_promote(int argc, char **argv)
{
      zfs_handle_t *zhp;
      int ret;

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

      /* check number of arguments */
      if (argc < 2) {
            (void) fprintf(stderr, gettext("missing clone filesystem"
                " argument\n"));
            usage(B_FALSE);
      }
      if (argc > 2) {
            (void) fprintf(stderr, gettext("too many arguments\n"));
            usage(B_FALSE);
      }

      zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
      if (zhp == NULL)
            return (1);

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


      zfs_close(zhp);
      return (ret);
}

/*
 * zfs rollback [-rRf] <snapshot>
 *
 *    -r    Delete any intervening snapshots before doing rollback
 *    -R    Delete any snapshots and their clones
 *    -f    ignored for backwards compatability
 *
 * Given a filesystem, rollback to a specific snapshot, discarding any changes
 * since then and making it the active dataset.  If more recent snapshots exist,
 * the command will complain unless the '-r' flag is given.
 */
typedef struct rollback_cbdata {
      uint64_t    cb_create;
      boolean_t   cb_first;
      int         cb_doclones;
      char        *cb_target;
      int         cb_error;
      boolean_t   cb_recurse;
      boolean_t   cb_dependent;
} rollback_cbdata_t;

/*
 * Report any snapshots more recent than the one specified.  Used when '-r' is
 * not specified.  We reuse this same callback for the snapshot dependents - if
 * 'cb_dependent' is set, then this is a dependent and we should report it
 * without checking the transaction group.
 */
static int
rollback_check(zfs_handle_t *zhp, void *data)
{
      rollback_cbdata_t *cbp = data;

      if (cbp->cb_doclones) {
            zfs_close(zhp);
            return (0);
      }

      if (!cbp->cb_dependent) {
            if (strcmp(zfs_get_name(zhp), cbp->cb_target) != 0 &&
                zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
                zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) >
                cbp->cb_create) {

                  if (cbp->cb_first && !cbp->cb_recurse) {
                        (void) fprintf(stderr, gettext("cannot "
                            "rollback to '%s': more recent snapshots "
                            "exist\n"),
                            cbp->cb_target);
                        (void) fprintf(stderr, gettext("use '-r' to "
                            "force deletion of the following "
                            "snapshots:\n"));
                        cbp->cb_first = 0;
                        cbp->cb_error = 1;
                  }

                  if (cbp->cb_recurse) {
                        cbp->cb_dependent = B_TRUE;
                        if (zfs_iter_dependents(zhp, B_TRUE,
                            rollback_check, cbp) != 0) {
                              zfs_close(zhp);
                              return (-1);
                        }
                        cbp->cb_dependent = B_FALSE;
                  } else {
                        (void) fprintf(stderr, "%s\n",
                            zfs_get_name(zhp));
                  }
            }
      } else {
            if (cbp->cb_first && cbp->cb_recurse) {
                  (void) fprintf(stderr, gettext("cannot rollback to "
                      "'%s': clones of previous snapshots exist\n"),
                      cbp->cb_target);
                  (void) fprintf(stderr, gettext("use '-R' to "
                      "force deletion of the following clones and "
                      "dependents:\n"));
                  cbp->cb_first = 0;
                  cbp->cb_error = 1;
            }

            (void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
      }

      zfs_close(zhp);
      return (0);
}

static int
zfs_do_rollback(int argc, char **argv)
{
      int ret;
      int c;
      boolean_t force = B_FALSE;
      rollback_cbdata_t cb = { 0 };
      zfs_handle_t *zhp, *snap;
      char parentname[ZFS_MAXNAMELEN];
      char *delim;

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

      argc -= optind;
      argv += optind;

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

      /* open the snapshot */
      if ((snap = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
            return (1);

      /* open the parent dataset */
      (void) strlcpy(parentname, argv[0], sizeof (parentname));
      verify((delim = strrchr(parentname, '@')) != NULL);
      *delim = '\0';
      if ((zhp = zfs_open(g_zfs, parentname, ZFS_TYPE_DATASET)) == NULL) {
            zfs_close(snap);
            return (1);
      }

      /*
       * Check for more recent snapshots and/or clones based on the presence
       * of '-r' and '-R'.
       */
      cb.cb_target = argv[0];
      cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
      cb.cb_first = B_TRUE;
      cb.cb_error = 0;
      if ((ret = zfs_iter_children(zhp, rollback_check, &cb)) != 0)
            goto out;

      if ((ret = cb.cb_error) != 0)
            goto out;

      /*
       * Rollback parent to the given snapshot.
       */
      ret = zfs_rollback(zhp, snap, force);

out:
      zfs_close(snap);
      zfs_close(zhp);

      if (ret == 0)
            return (0);
      else
            return (1);
}

/*
 * zfs set property=value { fs | snap | vol } ...
 *
 * Sets the given property for all datasets specified on the command line.
 */
typedef struct set_cbdata {
      char        *cb_propname;
      char        *cb_value;
} set_cbdata_t;

static int
set_callback(zfs_handle_t *zhp, void *data)
{
      set_cbdata_t *cbp = data;

      if (zfs_prop_set(zhp, cbp->cb_propname, cbp->cb_value) != 0) {
            switch (libzfs_errno(g_zfs)) {
            case EZFS_MOUNTFAILED:
                  (void) fprintf(stderr, gettext("property may be set "
                      "but unable to remount filesystem\n"));
                  break;
            case EZFS_SHARENFSFAILED:
                  (void) fprintf(stderr, gettext("property may be set "
                      "but unable to reshare filesystem\n"));
                  break;
            }
            return (1);
      }
      return (0);
}

static int
zfs_do_set(int argc, char **argv)
{
      set_cbdata_t cb;
      int ret;

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

      /* check number of arguments */
      if (argc < 2) {
            (void) fprintf(stderr, gettext("missing property=value "
                "argument\n"));
            usage(B_FALSE);
      }
      if (argc < 3) {
            (void) fprintf(stderr, gettext("missing dataset name\n"));
            usage(B_FALSE);
      }

      /* validate property=value argument */
      cb.cb_propname = argv[1];
      if (((cb.cb_value = strchr(cb.cb_propname, '=')) == NULL) ||
          (cb.cb_value[1] == '\0')) {
            (void) fprintf(stderr, gettext("missing value in "
                "property=value argument\n"));
            usage(B_FALSE);
      }

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

      if (*cb.cb_propname == '\0') {
            (void) fprintf(stderr,
                gettext("missing property in property=value argument\n"));
            usage(B_FALSE);
      }

      ret = zfs_for_each(argc - 2, argv + 2, 0,
          ZFS_TYPE_DATASET, NULL, NULL, 0, set_callback, &cb);

      return (ret);
}

/*
 * zfs snapshot [-r] [-o prop=value] ... <fs@snap>
 *
 * Creates a snapshot with the given name.  While functionally equivalent to
 * 'zfs create', it is a separate command to differentiate intent.
 */
static int
zfs_do_snapshot(int argc, char **argv)
{
      boolean_t recursive = B_FALSE;
      int ret;
      int c;
      nvlist_t *props;

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

      /* check options */
      while ((c = getopt(argc, argv, "ro:")) != -1) {
            switch (c) {
            case 'o':
                  if (parseprop(props))
                        return (1);
                  break;
            case 'r':
                  recursive = B_TRUE;
                  break;
            case '?':
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  goto usage;
            }
      }

      argc -= optind;
      argv += optind;

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

      ret = zfs_snapshot(g_zfs, argv[0], recursive, props);
      nvlist_free(props);
      if (ret && recursive)
            (void) fprintf(stderr, gettext("no snapshots were created\n"));
      return (ret != 0);

usage:
      nvlist_free(props);
      usage(B_FALSE);
      return (-1);
}

/*
 * zfs send [-v] -R [-i|-I <@snap>] <fs@snap>
 * zfs send [-v] [-i|-I <@snap>] <fs@snap>
 *
 * Send a backup stream to stdout.
 */
static int
zfs_do_send(int argc, char **argv)
{
      char *fromname = NULL;
      char *toname = NULL;
      char *cp;
      zfs_handle_t *zhp;
      boolean_t doall = B_FALSE;
      boolean_t replicate = B_FALSE;
      boolean_t fromorigin = B_FALSE;
      boolean_t verbose = B_FALSE;
      int c, err;

      /* check options */
      while ((c = getopt(argc, argv, ":i:I:Rv")) != -1) {
            switch (c) {
            case 'i':
                  if (fromname)
                        usage(B_FALSE);
                  fromname = optarg;
                  break;
            case 'I':
                  if (fromname)
                        usage(B_FALSE);
                  fromname = optarg;
                  doall = B_TRUE;
                  break;
            case 'R':
                  replicate = B_TRUE;
                  break;
            case 'v':
                  verbose = B_TRUE;
                  break;
            case ':':
                  (void) fprintf(stderr, gettext("missing argument for "
                      "'%c' option\n"), optopt);
                  usage(B_FALSE);
                  break;
            case '?':
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  usage(B_FALSE);
            }
      }

      argc -= optind;
      argv += optind;

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

      if (isatty(STDOUT_FILENO)) {
            (void) fprintf(stderr,
                gettext("Error: Stream can not be written to a terminal.\n"
                "You must redirect standard output.\n"));
            return (1);
      }

      cp = strchr(argv[0], '@');
      if (cp == NULL) {
            (void) fprintf(stderr,
                gettext("argument must be a snapshot\n"));
            usage(B_FALSE);
      }
      *cp = '\0';
      toname = cp + 1;
      zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
      if (zhp == NULL)
            return (1);

      /*
       * If they specified the full path to the snapshot, chop off
       * everything except the short name of the snapshot, but special
       * case if they specify the origin.
       */
      if (fromname && (cp = strchr(fromname, '@')) != NULL) {
            char origin[ZFS_MAXNAMELEN];
            zprop_source_t src;

            (void) zfs_prop_get(zhp, ZFS_PROP_ORIGIN,
                origin, sizeof (origin), &src, NULL, 0, B_FALSE);

            if (strcmp(origin, fromname) == 0) {
                  fromname = NULL;
                  fromorigin = B_TRUE;
            } else {
                  *cp = '\0';
                  if (cp != fromname && strcmp(argv[0], fromname)) {
                        (void) fprintf(stderr,
                            gettext("incremental source must be "
                            "in same filesystem\n"));
                        usage(B_FALSE);
                  }
                  fromname = cp + 1;
                  if (strchr(fromname, '@') || strchr(fromname, '/')) {
                        (void) fprintf(stderr,
                            gettext("invalid incremental source\n"));
                        usage(B_FALSE);
                  }
            }
      }

      if (replicate && fromname == NULL)
            doall = B_TRUE;

      err = zfs_send(zhp, fromname, toname, replicate, doall, fromorigin,
          verbose, STDOUT_FILENO);
      zfs_close(zhp);

      return (err != 0);
}

/*
 * zfs receive [-dnvF] <fs@snap>
 *
 * Restore a backup stream from stdin.
 */
static int
zfs_do_receive(int argc, char **argv)
{
      int c, err;
      recvflags_t flags;

      bzero(&flags, sizeof (recvflags_t));
      /* check options */
      while ((c = getopt(argc, argv, ":dnuvF")) != -1) {
            switch (c) {
            case 'd':
                  flags.isprefix = B_TRUE;
                  break;
            case 'n':
                  flags.dryrun = B_TRUE;
                  break;
            case 'u':
                  flags.nomount = B_TRUE;
                  break;
            case 'v':
                  flags.verbose = B_TRUE;
                  break;
            case 'F':
                  flags.force = B_TRUE;
                  break;
            case ':':
                  (void) fprintf(stderr, gettext("missing argument for "
                      "'%c' option\n"), optopt);
                  usage(B_FALSE);
                  break;
            case '?':
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  usage(B_FALSE);
            }
      }

      argc -= optind;
      argv += optind;

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

      if (isatty(STDIN_FILENO)) {
            (void) fprintf(stderr,
                gettext("Error: Backup stream can not be read "
                "from a terminal.\n"
                "You must redirect standard input.\n"));
            return (1);
      }

      err = zfs_receive(g_zfs, argv[0], flags, STDIN_FILENO, NULL);

      return (err != 0);
}

typedef struct get_all_cbdata {
      zfs_handle_t      **cb_handles;
      size_t            cb_alloc;
      size_t            cb_used;
      uint_t            cb_types;
      boolean_t   cb_verbose;
} get_all_cbdata_t;

#define     CHECK_SPINNER 30
#define     SPINNER_TIME 3          /* seconds */
#define     MOUNT_TIME 5            /* seconds */

static int
get_one_dataset(zfs_handle_t *zhp, void *data)
{
      static char spin[] = { '-', '\\', '|', '/' };
      static int spinval = 0;
      static int spincheck = 0;
      static time_t last_spin_time = (time_t)0;
      get_all_cbdata_t *cbp = data;
      zfs_type_t type = zfs_get_type(zhp);

      if (cbp->cb_verbose) {
            if (--spincheck < 0) {
                  time_t now = time(NULL);
                  if (last_spin_time + SPINNER_TIME < now) {
                        (void) printf("\b%c", spin[spinval++ % 4]);
                        (void) fflush(stdout);
                        last_spin_time = now;
                  }
                  spincheck = CHECK_SPINNER;
            }
      }

      /*
       * Interate over any nested datasets.
       */
      if (type == ZFS_TYPE_FILESYSTEM &&
          zfs_iter_filesystems(zhp, get_one_dataset, data) != 0) {
            zfs_close(zhp);
            return (1);
      }

      /*
       * Skip any datasets whose type does not match.
       */
      if ((type & cbp->cb_types) == 0) {
            zfs_close(zhp);
            return (0);
      }

      if (cbp->cb_alloc == cbp->cb_used) {
            zfs_handle_t **handles;

            if (cbp->cb_alloc == 0)
                  cbp->cb_alloc = 64;
            else
                  cbp->cb_alloc *= 2;

            handles = safe_malloc(cbp->cb_alloc * sizeof (void *));

            if (cbp->cb_handles) {
                  bcopy(cbp->cb_handles, handles,
                      cbp->cb_used * sizeof (void *));
                  free(cbp->cb_handles);
            }

            cbp->cb_handles = handles;
      }

      cbp->cb_handles[cbp->cb_used++] = zhp;

      return (0);
}

static void
get_all_datasets(uint_t types, zfs_handle_t ***dslist, size_t *count,
    boolean_t verbose)
{
      get_all_cbdata_t cb = { 0 };
      cb.cb_types = types;
      cb.cb_verbose = verbose;

      if (verbose) {
            (void) printf("%s: *", gettext("Reading ZFS config"));
            (void) fflush(stdout);
      }

      int ret = zfs_iter_root(g_zfs, get_one_dataset, &cb);
      if (ret < 0) {
        printf("WARNING: get_all_datasets got an error in zfs_iter_root : %s\n",
            strerror(ret));
      }

      *dslist = cb.cb_handles;
      *count = cb.cb_used;

      if (verbose) {
            (void) printf("\b%s\n", gettext("done."));
      }
}

static int
dataset_cmp(const void *a, const void *b)
{
      zfs_handle_t **za = (zfs_handle_t **)a;
      zfs_handle_t **zb = (zfs_handle_t **)b;
      char mounta[MAXPATHLEN];
      char mountb[MAXPATHLEN];
      boolean_t gota, gotb;

      if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0)
            verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
                sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
      if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0)
            verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
                sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);

      if (gota && gotb)
            return (strcmp(mounta, mountb));

      if (gota)
            return (-1);
      if (gotb)
            return (1);

      return (strcmp(zfs_get_name(a), zfs_get_name(b)));
}

/*
 * Generic callback for sharing or mounting filesystems.  Because the code is so
 * similar, we have a common function with an extra parameter to determine which
 * mode we are using.
 */
#define     OP_SHARE    0x1
#define     OP_MOUNT    0x2

/*
 * Share or mount a dataset.
 */
static int
share_mount_one(zfs_handle_t *zhp, int op, int flags, char *protocol,
    boolean_t explicit, const char *options)
{
      char mountpoint[ZFS_MAXPROPLEN];
      char shareopts[ZFS_MAXPROPLEN];
      char smbshareopts[ZFS_MAXPROPLEN];
      const char *cmdname = op == OP_SHARE ? "share" : "mount";
      struct mnttab mnt;
      uint64_t zoned, canmount;
      zfs_type_t type = zfs_get_type(zhp);
      boolean_t shared_nfs, shared_smb;

      assert(type & (ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME));

      if (type == ZFS_TYPE_FILESYSTEM) {
            /*
             * Check to make sure we can mount/share this dataset.  If we
             * are in the global zone and the filesystem is exported to a
             * local zone, or if we are in a local zone and the
             * filesystem is not exported, then it is an error.
             */
            zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);

            if (zoned && getzoneid() == GLOBAL_ZONEID) {
                  if (!explicit)
                        return (0);

                  (void) fprintf(stderr, gettext("cannot %s '%s': "
                      "dataset is exported to a local zone\n"), cmdname,
                      zfs_get_name(zhp));
                  return (1);

            } else if (!zoned && getzoneid() != GLOBAL_ZONEID) {
                  if (!explicit)
                        return (0);

                  (void) fprintf(stderr, gettext("cannot %s '%s': "
                      "permission denied\n"), cmdname,
                      zfs_get_name(zhp));
                  return (1);
            }

            /*
             * Ignore any filesystems which don't apply to us. This
             * includes those with a legacy mountpoint, or those with
             * legacy share options.
             */
            verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
                sizeof (mountpoint), NULL, NULL, 0, B_FALSE) == 0);
            verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, shareopts,
                sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
            verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshareopts,
                sizeof (smbshareopts), NULL, NULL, 0, B_FALSE) == 0);

            if (op == OP_SHARE && strcmp(shareopts, "off") == 0 &&
                strcmp(smbshareopts, "off") == 0) {
                  if (!explicit)
                        return (0);

                  (void) fprintf(stderr, gettext("cannot share '%s': "
                      "legacy share\n"), zfs_get_name(zhp));
                  (void) fprintf(stderr, gettext("use share(1M) to "
                      "share this filesystem, or set "
                      "sharenfs property on\n"));
                  return (1);
            }

            /*
             * We cannot share or mount legacy filesystems. If the
             * shareopts is non-legacy but the mountpoint is legacy, we
             * treat it as a legacy share.
             */
            if (strcmp(mountpoint, "legacy") == 0) {
                  if (!explicit)
                        return (0);

                  (void) fprintf(stderr, gettext("cannot %s '%s': "
                      "legacy mountpoint\n"), cmdname, zfs_get_name(zhp));
                  (void) fprintf(stderr, gettext("use %s(1M) to "
                      "%s this filesystem\n"), cmdname, cmdname);
                  return (1);
            }

            if (strcmp(mountpoint, "none") == 0) {
                  if (!explicit)
                        return (0);

                  (void) fprintf(stderr, gettext("cannot %s '%s': no "
                      "mountpoint set\n"), cmdname, zfs_get_name(zhp));
                  return (1);
            }

            /*
             * canmount explicit    outcome
             * on       no          pass through
             * on       yes         pass through
             * off            no          return 0
             * off            yes         display error, return 1
             * noauto   no          return 0
             * noauto   yes         pass through
             */
            canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
            if (canmount == ZFS_CANMOUNT_OFF) {
                  if (!explicit)
                        return (0);

                  (void) fprintf(stderr, gettext("cannot %s '%s': "
                      "'canmount' property is set to 'off'\n"), cmdname,
                      zfs_get_name(zhp));
                  return (1);
            } else if (canmount == ZFS_CANMOUNT_NOAUTO && !explicit) {
                  return (0);
            }

            /*
             * At this point, we have verified that the mountpoint and/or
             * shareopts are appropriate for auto management. If the
             * filesystem is already mounted or shared, return (failing
             * for explicit requests); otherwise mount or share the
             * filesystem.
             */
            switch (op) {
            case OP_SHARE:

                  shared_nfs = zfs_is_shared_nfs(zhp, NULL);
                  shared_smb = zfs_is_shared_smb(zhp, NULL);

                  if (shared_nfs && shared_smb ||
                      (shared_nfs && strcmp(shareopts, "on") == 0 &&
                      strcmp(smbshareopts, "off") == 0) ||
                      (shared_smb && strcmp(smbshareopts, "on") == 0 &&
                      strcmp(shareopts, "off") == 0)) {
                        if (!explicit)
                              return (0);

                        (void) fprintf(stderr, gettext("cannot share "
                            "'%s': filesystem already shared\n"),
                            zfs_get_name(zhp));
                        return (1);
                  }

                  if (!zfs_is_mounted(zhp, NULL) &&
                      zfs_mount(zhp, NULL, 0) != 0)
                        return (1);

                  if (protocol == NULL) {
                        if (zfs_shareall(zhp) != 0)
                              return (1);
                  } else if (strcmp(protocol, "nfs") == 0) {
                        if (zfs_share_nfs(zhp))
                              return (1);
                  } else if (strcmp(protocol, "smb") == 0) {
                        if (zfs_share_smb(zhp))
                              return (1);
                  } else {
                        (void) fprintf(stderr, gettext("cannot share "
                            "'%s': invalid share type '%s' "
                            "specified\n"),
                            zfs_get_name(zhp), protocol);
                        return (1);
                  }

                  break;

            case OP_MOUNT:
                  if (options == NULL)
                        mnt.mnt_mntopts = "";
                  else
                        mnt.mnt_mntopts = (char *)options;

                  if (!hasmntopt(&mnt, MNTOPT_REMOUNT) &&
                      zfs_is_mounted(zhp, NULL)) {
                        if (!explicit)
                              return (0);

                        (void) fprintf(stderr, gettext("cannot mount "
                            "'%s': filesystem already mounted\n"),
                            zfs_get_name(zhp));
                        return (1);
                  }

                  if (zfs_mount(zhp, options, flags) != 0)
                        return (1);
                  break;
            }
      } else {
            assert(op == OP_SHARE);

            /*
             * Ignore any volumes that aren't shared.
             */
            verify(zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI, shareopts,
                sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);

            if (strcmp(shareopts, "off") == 0) {
                  if (!explicit)
                        return (0);

                  (void) fprintf(stderr, gettext("cannot share '%s': "
                      "'shareiscsi' property not set\n"),
                      zfs_get_name(zhp));
                  (void) fprintf(stderr, gettext("set 'shareiscsi' "
                      "property or use iscsitadm(1M) to share this "
                      "volume\n"));
                  return (1);
            }

            if (zfs_is_shared_iscsi(zhp)) {
                  if (!explicit)
                        return (0);

                  (void) fprintf(stderr, gettext("cannot share "
                      "'%s': volume already shared\n"),
                      zfs_get_name(zhp));
                  return (1);
            }

            if (zfs_share_iscsi(zhp) != 0)
                  return (1);
      }

      return (0);
}

/*
 * Reports progress in the form "(current/total)".  Not thread-safe.
 */
static void
report_mount_progress(int current, int total)
{
      static int len;
      static char *reverse = "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b"
          "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b";
      static time_t last_progress_time;
      time_t now = time(NULL);

      /* report 1..n instead of 0..n-1 */
      ++current;

      /* display header if we're here for the first time */
      if (current == 1) {
            (void) printf(gettext("Mounting ZFS filesystems: "));
            len = 0;
      } else if (current != total && last_progress_time + MOUNT_TIME >= now) {
            /* too soon to report again */
            return;
      }

      last_progress_time = now;

      /* back up to prepare for overwriting */
      if (len)
            (void) printf("%*.*s", len, len, reverse);

      /* We put a newline at the end if this is the last one.  */
      len = printf("(%d/%d)%s", current, total, current == total ? "\n" : "");
      (void) fflush(stdout);
}

static void
append_options(char *mntopts, char *newopts)
{
      int len = strlen(mntopts);

      /* original length plus new string to append plus 1 for the comma */
      if (len + 1 + strlen(newopts) >= MNT_LINE_MAX) {
            (void) fprintf(stderr, gettext("the opts argument for "
                "'%s' option is too long (more than %d chars)\n"),
                "-o", MNT_LINE_MAX);
            usage(B_FALSE);
      }

      if (*mntopts)
            mntopts[len++] = ',';

      (void) strcpy(&mntopts[len], newopts);
}

static int
share_mount(int op, int argc, char **argv)
{
      int do_all = 0;
      boolean_t verbose = B_FALSE;
      int c, ret = 0;
      char *options = NULL;
      int types, flags = 0;

      /* check options */
      while ((c = getopt(argc, argv, op == OP_MOUNT ? ":avo:O" : "a"))
          != -1) {
            switch (c) {
            case 'a':
                  do_all = 1;
                  break;
            case 'v':
                  verbose = B_TRUE;
                  break;
            case 'o':
                  if (*optarg == '\0') {
                        (void) fprintf(stderr, gettext("empty mount "
                            "options (-o) specified\n"));
                        usage(B_FALSE);
                  }

                  if (options == NULL)
                        options = safe_malloc(MNT_LINE_MAX + 1);

                  /* option validation is done later */
                  append_options(options, optarg);
                  break;

            case 'O':
                  flags |= MS_OVERLAY;
                  break;
            case ':':
                  (void) fprintf(stderr, gettext("missing argument for "
                      "'%c' option\n"), optopt);
                  usage(B_FALSE);
                  break;
            case '?':
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  usage(B_FALSE);
            }
      }

      argc -= optind;
      argv += optind;

      /* check number of arguments */
      if (do_all) {
            zfs_handle_t **dslist = NULL;
            size_t i, count = 0;
            char *protocol = NULL;

            if (op == OP_MOUNT) {
                  types = ZFS_TYPE_FILESYSTEM;
            } else if (argc > 0) {
                  if (strcmp(argv[0], "nfs") == 0 ||
                      strcmp(argv[0], "smb") == 0) {
                        types = ZFS_TYPE_FILESYSTEM;
                  } else if (strcmp(argv[0], "iscsi") == 0) {
                        types = ZFS_TYPE_VOLUME;
                  } else {
                        (void) fprintf(stderr, gettext("share type "
                            "must be 'nfs', 'smb' or 'iscsi'\n"));
                        usage(B_FALSE);
                  }
                  protocol = argv[0];
                  argc--;
                  argv++;
            } else {
                  types = ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME;
            }

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

            get_all_datasets(types, &dslist, &count, verbose);

            if (count == 0)
                  return (0);

            qsort(dslist, count, sizeof (void *), dataset_cmp);

            for (i = 0; i < count; i++) {
                  if (verbose)
                        report_mount_progress(i, count);

                  if (share_mount_one(dslist[i], op, flags, protocol,
                      B_FALSE, options) != 0)
                        ret = 1;
                  zfs_close(dslist[i]);
            }

            free(dslist);
      } else if (argc == 0) {
            struct mnttab entry;

            if ((op == OP_SHARE) || (options != NULL)) {
                  (void) fprintf(stderr, gettext("missing filesystem "
                      "argument (specify -a for all)\n"));
                  usage(B_FALSE);
            }

            /*
             * When mount is given no arguments, go through /etc/mnttab and
             * display any active ZFS mounts.  We hide any snapshots, since
             * they are controlled automatically.
             */
            rewind(mnttab_file);
            while (getmntent(mnttab_file, &entry) == 0) {
                  if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0 ||
                      strchr(entry.mnt_special, '@') != NULL)
                        continue;

                  (void) printf("%-30s  %s\n", entry.mnt_special,
                      entry.mnt_mountp);
            }

      } else {
            zfs_handle_t *zhp;

            types = ZFS_TYPE_FILESYSTEM;
            if (op == OP_SHARE)
                  types |= ZFS_TYPE_VOLUME;

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

            if ((zhp = zfs_open(g_zfs, argv[0], types)) == NULL) {
                  ret = 1;
            } else {
                  ret = share_mount_one(zhp, op, flags, NULL, B_TRUE,
                      options);
                  zfs_close(zhp);
            }
      }

      return (ret);
}

/*
 * zfs mount -a [nfs | iscsi]
 * zfs mount filesystem
 *
 * Mount all filesystems, or mount the given filesystem.
 */
static int
zfs_do_mount(int argc, char **argv)
{
      return (share_mount(OP_MOUNT, argc, argv));
}

/*
 * zfs share -a [nfs | iscsi | smb]
 * zfs share filesystem
 *
 * Share all filesystems, or share the given filesystem.
 */
static int
zfs_do_share(int argc, char **argv)
{
      return (share_mount(OP_SHARE, argc, argv));
}

typedef struct unshare_unmount_node {
      zfs_handle_t      *un_zhp;
      char        *un_mountp;
      uu_avl_node_t     un_avlnode;
} unshare_unmount_node_t;

/* ARGSUSED */
static int
unshare_unmount_compare(const void *larg, const void *rarg, void *unused)
{
      const unshare_unmount_node_t *l = larg;
      const unshare_unmount_node_t *r = rarg;

      return (strcmp(l->un_mountp, r->un_mountp));
}

/*
 * Convenience routine used by zfs_do_umount() and manual_unmount().  Given an
 * absolute path, find the entry /etc/mnttab, verify that its a ZFS filesystem,
 * and unmount it appropriately.
 */
static int
unshare_unmount_path(int op, char *path, int flags, boolean_t is_manual)
{
      zfs_handle_t *zhp;
      int ret;
      struct stat64 statbuf;
      struct extmnttab entry;
      const char *cmdname = (op == OP_SHARE) ? "unshare" : "unmount";
      ino_t path_inode;

      /*
       * Search for the path in /etc/mnttab.  Rather than looking for the
       * specific path, which can be fooled by non-standard paths (i.e. ".."
       * or "//"), we stat() the path and search for the corresponding
       * (major,minor) device pair.
       */
      if (stat64(path, &statbuf) != 0) {
            (void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
                cmdname, path, strerror(errno));
            return (1);
      }
      path_inode = statbuf.st_ino;

      /*
       * Search for the given (major,minor) pair in the mount table.
       */
      rewind(mnttab_file);
      while ((ret = getextmntent(mnttab_file, &entry, 0)) == 0) {
            if (entry.mnt_major == major(statbuf.st_dev) &&
                entry.mnt_minor == minor(statbuf.st_dev))
                  break;
      }
      if (ret != 0) {
            if (op == OP_SHARE) {
                  (void) fprintf(stderr, gettext("cannot %s '%s': not "
                      "currently mounted\n"), cmdname, path);
                  return (1);
            }
            (void) fprintf(stderr, gettext("warning: %s not in mnttab\n"),
                path);
            if ((ret = umount2(path, flags)) != 0)
                  (void) fprintf(stderr, gettext("%s: %s\n"), path,
                      strerror(errno));
            return (ret != 0);
      }

      if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0) {
            (void) fprintf(stderr, gettext("cannot %s '%s': not a ZFS "
                "filesystem\n"), cmdname, path);
            return (1);
      }

      if ((zhp = zfs_open(g_zfs, entry.mnt_special,
          ZFS_TYPE_FILESYSTEM)) == NULL)
            return (1);

      ret = 1;
      if (stat64(entry.mnt_mountp, &statbuf) != 0) {
            (void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
                cmdname, path, strerror(errno));
            goto out;
      } else if (statbuf.st_ino != path_inode) {
            (void) fprintf(stderr, gettext("cannot "
                "%s '%s': not a mountpoint\n"), cmdname, path);
            goto out;
      }

      if (op == OP_SHARE) {
            char nfs_mnt_prop[ZFS_MAXPROPLEN];
            char smbshare_prop[ZFS_MAXPROPLEN];

            verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, nfs_mnt_prop,
                sizeof (nfs_mnt_prop), NULL, NULL, 0, B_FALSE) == 0);
            verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshare_prop,
                sizeof (smbshare_prop), NULL, NULL, 0, B_FALSE) == 0);

            if (strcmp(nfs_mnt_prop, "off") == 0 &&
                strcmp(smbshare_prop, "off") == 0) {
                  (void) fprintf(stderr, gettext("cannot unshare "
                      "'%s': legacy share\n"), path);
                  (void) fprintf(stderr, gettext("use "
                      "unshare(1M) to unshare this filesystem\n"));
            } else if (!zfs_is_shared(zhp)) {
                  (void) fprintf(stderr, gettext("cannot unshare '%s': "
                      "not currently shared\n"), path);
            } else {
                  ret = zfs_unshareall_bypath(zhp, path);
            }
      } else {
            char mtpt_prop[ZFS_MAXPROPLEN];

            verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mtpt_prop,
                sizeof (mtpt_prop), NULL, NULL, 0, B_FALSE) == 0);

            if (is_manual) {
                  ret = zfs_unmount(zhp, NULL, flags);
            } else if (strcmp(mtpt_prop, "legacy") == 0) {
                  (void) fprintf(stderr, gettext("cannot unmount "
                      "'%s': legacy mountpoint\n"),
                      zfs_get_name(zhp));
                  (void) fprintf(stderr, gettext("use umount(1M) "
                      "to unmount this filesystem\n"));
            } else {
                  ret = zfs_unmountall(zhp, flags);
            }
      }

out:
      zfs_close(zhp);

      return (ret != 0);
}

/*
 * Generic callback for unsharing or unmounting a filesystem.
 */
static int
unshare_unmount(int op, int argc, char **argv)
{
      int do_all = 0;
      int flags = 0;
      int ret = 0;
      int types, c;
      zfs_handle_t *zhp;
      char nfsiscsi_mnt_prop[ZFS_MAXPROPLEN];
      char sharesmb[ZFS_MAXPROPLEN];

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

      argc -= optind;
      argv += optind;

      if (do_all) {
            /*
             * We could make use of zfs_for_each() to walk all datasets in
             * the system, but this would be very inefficient, especially
             * since we would have to linearly search /etc/mnttab for each
             * one.  Instead, do one pass through /etc/mnttab looking for
             * zfs entries and call zfs_unmount() for each one.
             *
             * Things get a little tricky if the administrator has created
             * mountpoints beneath other ZFS filesystems.  In this case, we
             * have to unmount the deepest filesystems first.  To accomplish
             * this, we place all the mountpoints in an AVL tree sorted by
             * the special type (dataset name), and walk the result in
             * reverse to make sure to get any snapshots first.
             */
            struct mnttab entry;
            uu_avl_pool_t *pool;
            uu_avl_t *tree;
            unshare_unmount_node_t *node;
            uu_avl_index_t idx;
            uu_avl_walk_t *walk;

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

            if ((pool = uu_avl_pool_create("unmount_pool",
                sizeof (unshare_unmount_node_t),
                offsetof(unshare_unmount_node_t, un_avlnode),
                unshare_unmount_compare,
                UU_DEFAULT)) == NULL) {
                  (void) fprintf(stderr, gettext("internal error: "
                      "out of memory\n"));
                  exit(1);
            }

            if ((tree = uu_avl_create(pool, NULL, UU_DEFAULT)) == NULL) {
                  (void) fprintf(stderr, gettext("internal error: "
                      "out of memory\n"));
                  exit(1);
            }

            rewind(mnttab_file);
            while (getmntent(mnttab_file, &entry) == 0) {

                  /* ignore non-ZFS entries */
                  if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
                        continue;

                  /* ignore snapshots */
                  if (strchr(entry.mnt_special, '@') != NULL)
                        continue;

                  if ((zhp = zfs_open(g_zfs, entry.mnt_special,
                      ZFS_TYPE_FILESYSTEM)) == NULL) {
                        ret = 1;
                        continue;
                  }

                  switch (op) {
                  case OP_SHARE:
                        verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
                            nfsiscsi_mnt_prop,
                            sizeof (nfsiscsi_mnt_prop),
                            NULL, NULL, 0, B_FALSE) == 0);
                        if (strcmp(nfsiscsi_mnt_prop, "off") != 0)
                              break;
                        verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
                            nfsiscsi_mnt_prop,
                            sizeof (nfsiscsi_mnt_prop),
                            NULL, NULL, 0, B_FALSE) == 0);
                        if (strcmp(nfsiscsi_mnt_prop, "off") == 0)
                              continue;
                        break;
                  case OP_MOUNT:
                        /* Ignore legacy mounts */
                        verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
                            nfsiscsi_mnt_prop,
                            sizeof (nfsiscsi_mnt_prop),
                            NULL, NULL, 0, B_FALSE) == 0);
                        if (strcmp(nfsiscsi_mnt_prop, "legacy") == 0)
                              continue;
                        /* Ignore canmount=noauto mounts */
                        if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) ==
                            ZFS_CANMOUNT_NOAUTO)
                              continue;
                  default:
                        break;
                  }

                  node = safe_malloc(sizeof (unshare_unmount_node_t));
                  node->un_zhp = zhp;

                  if ((node->un_mountp = strdup(entry.mnt_mountp)) ==
                      NULL) {
                        (void) fprintf(stderr, gettext("internal error:"
                            " out of memory\n"));
                        exit(1);
                  }

                  uu_avl_node_init(node, &node->un_avlnode, pool);

                  if (uu_avl_find(tree, node, NULL, &idx) == NULL) {
                        uu_avl_insert(tree, node, idx);
                  } else {
                        zfs_close(node->un_zhp);
                        free(node->un_mountp);
                        free(node);
                  }
            }

            /*
             * Walk the AVL tree in reverse, unmounting each filesystem and
             * removing it from the AVL tree in the process.
             */
            if ((walk = uu_avl_walk_start(tree,
                UU_WALK_REVERSE | UU_WALK_ROBUST)) == NULL) {
                  (void) fprintf(stderr,
                      gettext("internal error: out of memory"));
                  exit(1);
            }

            while ((node = uu_avl_walk_next(walk)) != NULL) {
                  uu_avl_remove(tree, node);

                  switch (op) {
                  case OP_SHARE:
                        if (zfs_unshareall_bypath(node->un_zhp,
                            node->un_mountp) != 0)
                              ret = 1;
                        break;

                  case OP_MOUNT:
                        if (zfs_unmount(node->un_zhp,
                            node->un_mountp, flags) != 0)
                              ret = 1;
                        break;
                  }

                  zfs_close(node->un_zhp);
                  free(node->un_mountp);
                  free(node);
            }

            uu_avl_walk_end(walk);
            uu_avl_destroy(tree);
            uu_avl_pool_destroy(pool);

            if (op == OP_SHARE) {
                  /*
                   * Finally, unshare any volumes shared via iSCSI.
                   */
                  zfs_handle_t **dslist = NULL;
                  size_t i, count = 0;

                  get_all_datasets(ZFS_TYPE_VOLUME, &dslist, &count,
                      B_FALSE);

                  if (count != 0) {
                        qsort(dslist, count, sizeof (void *),
                            dataset_cmp);

                        for (i = 0; i < count; i++) {
                              if (zfs_unshare_iscsi(dslist[i]) != 0)
                                    ret = 1;
                              zfs_close(dslist[i]);
                        }

                        free(dslist);
                  }
            }
      } else {
            if (argc != 1) {
                  if (argc == 0)
                        (void) fprintf(stderr,
                            gettext("missing filesystem argument\n"));
                  else
                        (void) fprintf(stderr,
                            gettext("too many arguments\n"));
                  usage(B_FALSE);
            }

            /*
             * We have an argument, but it may be a full path or a ZFS
             * filesystem.  Pass full paths off to unmount_path() (shared by
             * manual_unmount), otherwise open the filesystem and pass to
             * zfs_unmount().
             */
            if (argv[0][0] == '/')
                  return (unshare_unmount_path(op, argv[0],
                      flags, B_FALSE));

            types = ZFS_TYPE_FILESYSTEM;
            if (op == OP_SHARE)
                  types |= ZFS_TYPE_VOLUME;

            if ((zhp = zfs_open(g_zfs, argv[0], types)) == NULL)
                  return (1);

            if (zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
                  verify(zfs_prop_get(zhp, op == OP_SHARE ?
                      ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT,
                      nfsiscsi_mnt_prop, sizeof (nfsiscsi_mnt_prop), NULL,
                      NULL, 0, B_FALSE) == 0);

                  switch (op) {
                  case OP_SHARE:
                        verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
                            nfsiscsi_mnt_prop,
                            sizeof (nfsiscsi_mnt_prop),
                            NULL, NULL, 0, B_FALSE) == 0);
                        verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
                            sharesmb, sizeof (sharesmb), NULL, NULL,
                            0, B_FALSE) == 0);

                        if (strcmp(nfsiscsi_mnt_prop, "off") == 0 &&
                            strcmp(sharesmb, "off") == 0) {
                              (void) fprintf(stderr, gettext("cannot "
                                  "unshare '%s': legacy share\n"),
                                  zfs_get_name(zhp));
                              (void) fprintf(stderr, gettext("use "
                                  "unshare(1M) to unshare this "
                                  "filesystem\n"));
                              ret = 1;
                        } else if (!zfs_is_shared(zhp)) {
                              (void) fprintf(stderr, gettext("cannot "
                                  "unshare '%s': not currently "
                                  "shared\n"), zfs_get_name(zhp));
                              ret = 1;
                        } else if (zfs_unshareall(zhp) != 0) {
                              ret = 1;
                        }
                        break;

                  case OP_MOUNT:
                        if (strcmp(nfsiscsi_mnt_prop, "legacy") == 0) {
                              (void) fprintf(stderr, gettext("cannot "
                                  "unmount '%s': legacy "
                                  "mountpoint\n"), zfs_get_name(zhp));
                              (void) fprintf(stderr, gettext("use "
                                  "umount(1M) to unmount this "
                                  "filesystem\n"));
                              ret = 1;
                        } else if (!zfs_is_mounted(zhp, NULL)) {
                              (void) fprintf(stderr, gettext("cannot "
                                  "unmount '%s': not currently "
                                  "mounted\n"),
                                  zfs_get_name(zhp));
                              ret = 1;
                        } else if (zfs_unmountall(zhp, flags) != 0) {
                              ret = 1;
                        }
                        break;
                  }
            } else {
                  assert(op == OP_SHARE);

                  verify(zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI,
                      nfsiscsi_mnt_prop, sizeof (nfsiscsi_mnt_prop),
                      NULL, NULL, 0, B_FALSE) == 0);

                  if (strcmp(nfsiscsi_mnt_prop, "off") == 0) {
                        (void) fprintf(stderr, gettext("cannot unshare "
                            "'%s': 'shareiscsi' property not set\n"),
                            zfs_get_name(zhp));
                        (void) fprintf(stderr, gettext("set "
                            "'shareiscsi' property or use "
                            "iscsitadm(1M) to share this volume\n"));
                        ret = 1;
                  } else if (!zfs_is_shared_iscsi(zhp)) {
                        (void) fprintf(stderr, gettext("cannot "
                            "unshare '%s': not currently shared\n"),
                            zfs_get_name(zhp));
                        ret = 1;
                  } else if (zfs_unshare_iscsi(zhp) != 0) {
                        ret = 1;
                  }
            }

            zfs_close(zhp);
      }

      return (ret);
}

/*
 * zfs unmount -a
 * zfs unmount filesystem
 *
 * Unmount all filesystems, or a specific ZFS filesystem.
 */
static int
zfs_do_unmount(int argc, char **argv)
{
      return (unshare_unmount(OP_MOUNT, argc, argv));
}

/*
 * zfs unshare -a
 * zfs unshare filesystem
 *
 * Unshare all filesystems, or a specific ZFS filesystem.
 */
static int
zfs_do_unshare(int argc, char **argv)
{
      return (unshare_unmount(OP_SHARE, argc, argv));
}

/* ARGSUSED */
static int
zfs_do_python(int argc, char **argv)
{
      (void) execv(pypath, argv-1);
      (void) printf("internal error: %s not found\n", pypath);
      return (-1);
}

/*
 * Called when invoked as /etc/fs/zfs/mount.  Do the mount if the mountpoint is
 * 'legacy'.  Otherwise, complain that use should be using 'zfs mount'.
 */
static int
manual_mount(int argc, char **argv)
{
      zfs_handle_t *zhp;
      char mountpoint[ZFS_MAXPROPLEN];
      char mntopts[MNT_LINE_MAX] = { '\0' };
      int ret;
      int c;
      int flags = 0;
      char *dataset, *path;

      /* check options */
      while ((c = getopt(argc, argv, ":mo:O")) != -1) {
            switch (c) {
            case 'o':
                  (void) strlcpy(mntopts, optarg, sizeof (mntopts));
                  break;
            case 'O':
                  flags |= MS_OVERLAY;
                  break;
            case 'm':
                  flags |= MS_NOMNTTAB;
                  break;
            case ':':
                  (void) fprintf(stderr, gettext("missing argument for "
                      "'%c' option\n"), optopt);
                  usage(B_FALSE);
                  break;
            case '?':
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  (void) fprintf(stderr, gettext("usage: mount [-o opts] "
                      "<path>\n"));
                  return (2);
            }
      }

      argc -= optind;
      argv += optind;

      /* check that we only have two arguments */
      if (argc != 2) {
            if (argc == 0)
                  (void) fprintf(stderr, gettext("missing dataset "
                      "argument\n"));
            else if (argc == 1)
                  (void) fprintf(stderr,
                      gettext("missing mountpoint argument\n"));
            else
                  (void) fprintf(stderr, gettext("too many arguments\n"));
            (void) fprintf(stderr, "usage: mount <dataset> <mountpoint>\n");
            return (2);
      }

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

      /* try to open the dataset */
      if ((zhp = zfs_open(g_zfs, dataset, ZFS_TYPE_FILESYSTEM)) == NULL)
            return (1);

      (void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
          sizeof (mountpoint), NULL, NULL, 0, B_FALSE);

      /* check for legacy mountpoint and complain appropriately */
      ret = 0;
      if (strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) == 0) {
            if (mount(dataset, path, MS_OPTIONSTR | flags, MNTTYPE_ZFS,
                NULL, 0, mntopts, sizeof (mntopts)) != 0) {
                  (void) fprintf(stderr, gettext("mount failed: %s\n"),
                      strerror(errno));
                  ret = 1;
            }
      } else {
            (void) fprintf(stderr, gettext("filesystem '%s' cannot be "
                "mounted using 'mount -F zfs'\n"), dataset);
            (void) fprintf(stderr, gettext("Use 'zfs set mountpoint=%s' "
                "instead.\n"), path);
            (void) fprintf(stderr, gettext("If you must use 'mount -F zfs' "
                "or /etc/vfstab, use 'zfs set mountpoint=legacy'.\n"));
            (void) fprintf(stderr, gettext("See zfs(1M) for more "
                "information.\n"));
            ret = 1;
      }

      return (ret);
}

/*
 * Called when invoked as /etc/fs/zfs/umount.  Unlike a manual mount, we allow
 * unmounts of non-legacy filesystems, as this is the dominant administrative
 * interface.
 */
static int
manual_unmount(int argc, char **argv)
{
      int flags = 0;
      int c;

      /* check options */
      while ((c = getopt(argc, argv, "f")) != -1) {
            switch (c) {
            case 'f':
                  flags = MS_FORCE;
                  break;
            case '?':
                  (void) fprintf(stderr, gettext("invalid option '%c'\n"),
                      optopt);
                  (void) fprintf(stderr, gettext("usage: unmount [-f] "
                      "<path>\n"));
                  return (2);
            }
      }

      argc -= optind;
      argv += optind;

      /* check arguments */
      if (argc != 1) {
            if (argc == 0)
                  (void) fprintf(stderr, gettext("missing path "
                      "argument\n"));
            else
                  (void) fprintf(stderr, gettext("too many arguments\n"));
            (void) fprintf(stderr, gettext("usage: unmount [-f] <path>\n"));
            return (2);
      }

      return (unshare_unmount_path(OP_MOUNT, argv[0], flags, B_TRUE));
}

static int
volcheck(zpool_handle_t *zhp, void *data)
{
      boolean_t isinit = *((boolean_t *)data);

      if (isinit)
            return (zpool_create_zvol_links(zhp));
      else
            return (zpool_remove_zvol_links(zhp));
}

/*
 * Iterate over all pools in the system and either create or destroy /dev/zvol
 * links, depending on the value of 'isinit'.
 */
static int
do_volcheck(boolean_t isinit)
{
      return (zpool_iter(g_zfs, volcheck, &isinit) ? 1 : 0);
}

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

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

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

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

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

      opterr = 0;

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

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

      libzfs_print_on_error(g_zfs, B_TRUE);

      if ((mnttab_file = fopen(MNTTAB, "r")) == NULL) {
            (void) fprintf(stderr, gettext("internal error: unable to "
                "open %s\n"), MNTTAB);
            return (1);
      }

      /*
       * This command also doubles as the /etc/fs mount and unmount program.
       * Determine if we should take this behavior based on argv[0].
       */
      progname = basename(argv[0]);
      if (strcmp(progname, "mount") == 0) {
            ret = manual_mount(argc, argv);
      } else if (strcmp(progname, "umount") == 0) {
            ret = manual_unmount(argc, argv);
      } else {
            /*
             * Make sure the user has specified some command.
             */
            if (argc < 2) {
                  (void) fprintf(stderr, gettext("missing command\n"));
                  usage(B_FALSE);
            }

            cmdname = argv[1];

            /*
             * The 'umount' command is an alias for 'unmount'
             */
            if (strcmp(cmdname, "umount") == 0)
                  cmdname = "unmount";

            /*
             * The 'recv' command is an alias for 'receive'
             */
            if (strcmp(cmdname, "recv") == 0)
                  cmdname = "receive";

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

            /*
             * 'volinit' and 'volfini' do not appear in the usage message,
             * so we have to special case them here.
             */
            if (strcmp(cmdname, "volinit") == 0)
                  return (do_volcheck(B_TRUE));
            else if (strcmp(cmdname, "volfini") == 0)
                  return (do_volcheck(B_FALSE));

            /*
             * Run the appropriate command.
             */
            libzfs_mnttab_cache(g_zfs, B_TRUE);
            if (find_command_idx(cmdname, &i) == 0) {
                  current_command = &command_table[i];
                  ret = command_table[i].func(argc - 1, argv + 1);
            } else if (strchr(cmdname, '=') != NULL) {
                  verify(find_command_idx("set", &i) == 0);
                  current_command = &command_table[i];
                  ret = command_table[i].func(argc, argv);
            } else {
                  (void) fprintf(stderr, gettext("unrecognized "
                      "command '%s'\n"), cmdname);
                  usage(B_FALSE);
            }
            libzfs_mnttab_cache(g_zfs, B_FALSE);
      }

      (void) fclose(mnttab_file);

      libzfs_fini(g_zfs);

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

      return (ret);
}

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