1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright 2012 Nexenta Systems, Inc. All rights reserved.
  25  * Copyright (c) 2012 by Delphix. All rights reserved.
  26  * Copyright 2012 Milan Jurik. All rights reserved.
  27  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
  28  */
  29 
  30 #include <assert.h>
  31 #include <ctype.h>
  32 #include <errno.h>
  33 #include <libgen.h>
  34 #include <libintl.h>
  35 #include <libuutil.h>
  36 #include <libnvpair.h>
  37 #include <locale.h>
  38 #include <stddef.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <strings.h>
  42 #include <unistd.h>
  43 #include <fcntl.h>
  44 #include <zone.h>
  45 #include <grp.h>
  46 #include <pwd.h>
  47 #include <signal.h>
  48 #include <sys/list.h>
  49 #include <sys/mkdev.h>
  50 #include <sys/mntent.h>
  51 #include <sys/mnttab.h>
  52 #include <sys/mount.h>
  53 #include <sys/stat.h>
  54 #include <sys/fs/zfs.h>
  55 #include <sys/types.h>
  56 #include <time.h>
  57 
  58 #include <libzfs.h>
  59 #include <libzfs_core.h>
  60 #include <zfs_prop.h>
  61 #include <zfs_deleg.h>
  62 #include <libuutil.h>
  63 #include <aclutils.h>
  64 #include <directory.h>
  65 
  66 #include "zfs_iter.h"
  67 #include "zfs_util.h"
  68 #include "zfs_comutil.h"
  69 
  70 libzfs_handle_t *g_zfs;
  71 
  72 static FILE *mnttab_file;
  73 static char history_str[HIS_MAX_RECORD_LEN];
  74 static boolean_t log_history = B_TRUE;
  75 
  76 static int zfs_do_clone(int argc, char **argv);
  77 static int zfs_do_create(int argc, char **argv);
  78 static int zfs_do_destroy(int argc, char **argv);
  79 static int zfs_do_get(int argc, char **argv);
  80 static int zfs_do_inherit(int argc, char **argv);
  81 static int zfs_do_list(int argc, char **argv);
  82 static int zfs_do_mount(int argc, char **argv);
  83 static int zfs_do_rename(int argc, char **argv);
  84 static int zfs_do_rollback(int argc, char **argv);
  85 static int zfs_do_set(int argc, char **argv);
  86 static int zfs_do_upgrade(int argc, char **argv);
  87 static int zfs_do_snapshot(int argc, char **argv);
  88 static int zfs_do_unmount(int argc, char **argv);
  89 static int zfs_do_share(int argc, char **argv);
  90 static int zfs_do_unshare(int argc, char **argv);
  91 static int zfs_do_send(int argc, char **argv);
  92 static int zfs_do_receive(int argc, char **argv);
  93 static int zfs_do_promote(int argc, char **argv);
  94 static int zfs_do_userspace(int argc, char **argv);
  95 static int zfs_do_allow(int argc, char **argv);
  96 static int zfs_do_unallow(int argc, char **argv);
  97 static int zfs_do_hold(int argc, char **argv);
  98 static int zfs_do_holds(int argc, char **argv);
  99 static int zfs_do_release(int argc, char **argv);
 100 static int zfs_do_diff(int argc, char **argv);
 101 
 102 /*
 103  * Enable a reasonable set of defaults for libumem debugging on DEBUG builds.
 104  */
 105 
 106 #ifdef DEBUG
 107 const char *
 108 _umem_debug_init(void)
 109 {
 110         return ("default,verbose"); /* $UMEM_DEBUG setting */
 111 }
 112 
 113 const char *
 114 _umem_logging_init(void)
 115 {
 116         return ("fail,contents"); /* $UMEM_LOGGING setting */
 117 }
 118 #endif
 119 
 120 typedef enum {
 121         HELP_CLONE,
 122         HELP_CREATE,
 123         HELP_DESTROY,
 124         HELP_GET,
 125         HELP_INHERIT,
 126         HELP_UPGRADE,
 127         HELP_LIST,
 128         HELP_MOUNT,
 129         HELP_PROMOTE,
 130         HELP_RECEIVE,
 131         HELP_RENAME,
 132         HELP_ROLLBACK,
 133         HELP_SEND,
 134         HELP_SET,
 135         HELP_SHARE,
 136         HELP_SNAPSHOT,
 137         HELP_UNMOUNT,
 138         HELP_UNSHARE,
 139         HELP_ALLOW,
 140         HELP_UNALLOW,
 141         HELP_USERSPACE,
 142         HELP_GROUPSPACE,
 143         HELP_HOLD,
 144         HELP_HOLDS,
 145         HELP_RELEASE,
 146         HELP_DIFF,
 147 } zfs_help_t;
 148 
 149 typedef struct zfs_command {
 150         const char      *name;
 151         int             (*func)(int argc, char **argv);
 152         zfs_help_t      usage;
 153 } zfs_command_t;
 154 
 155 /*
 156  * Master command table.  Each ZFS command has a name, associated function, and
 157  * usage message.  The usage messages need to be internationalized, so we have
 158  * to have a function to return the usage message based on a command index.
 159  *
 160  * These commands are organized according to how they are displayed in the usage
 161  * message.  An empty command (one with a NULL name) indicates an empty line in
 162  * the generic usage message.
 163  */
 164 static zfs_command_t command_table[] = {
 165         { "create",     zfs_do_create,          HELP_CREATE             },
 166         { "destroy",    zfs_do_destroy,         HELP_DESTROY            },
 167         { NULL },
 168         { "snapshot",   zfs_do_snapshot,        HELP_SNAPSHOT           },
 169         { "rollback",   zfs_do_rollback,        HELP_ROLLBACK           },
 170         { "clone",      zfs_do_clone,           HELP_CLONE              },
 171         { "promote",    zfs_do_promote,         HELP_PROMOTE            },
 172         { "rename",     zfs_do_rename,          HELP_RENAME             },
 173         { NULL },
 174         { "list",       zfs_do_list,            HELP_LIST               },
 175         { NULL },
 176         { "set",        zfs_do_set,             HELP_SET                },
 177         { "get",        zfs_do_get,             HELP_GET                },
 178         { "inherit",    zfs_do_inherit,         HELP_INHERIT            },
 179         { "upgrade",    zfs_do_upgrade,         HELP_UPGRADE            },
 180         { "userspace",  zfs_do_userspace,       HELP_USERSPACE          },
 181         { "groupspace", zfs_do_userspace,       HELP_GROUPSPACE         },
 182         { NULL },
 183         { "mount",      zfs_do_mount,           HELP_MOUNT              },
 184         { "unmount",    zfs_do_unmount,         HELP_UNMOUNT            },
 185         { "share",      zfs_do_share,           HELP_SHARE              },
 186         { "unshare",    zfs_do_unshare,         HELP_UNSHARE            },
 187         { NULL },
 188         { "send",       zfs_do_send,            HELP_SEND               },
 189         { "receive",    zfs_do_receive,         HELP_RECEIVE            },
 190         { NULL },
 191         { "allow",      zfs_do_allow,           HELP_ALLOW              },
 192         { NULL },
 193         { "unallow",    zfs_do_unallow,         HELP_UNALLOW            },
 194         { NULL },
 195         { "hold",       zfs_do_hold,            HELP_HOLD               },
 196         { "holds",      zfs_do_holds,           HELP_HOLDS              },
 197         { "release",    zfs_do_release,         HELP_RELEASE            },
 198         { "diff",       zfs_do_diff,            HELP_DIFF               },
 199 };
 200 
 201 #define NCOMMAND        (sizeof (command_table) / sizeof (command_table[0]))
 202 
 203 zfs_command_t *current_command;
 204 
 205 static const char *
 206 get_usage(zfs_help_t idx)
 207 {
 208         switch (idx) {
 209         case HELP_CLONE:
 210                 return (gettext("\tclone [-p] [-o property=value] ... "
 211                     "<snapshot> <filesystem|volume>\n"));
 212         case HELP_CREATE:
 213                 return (gettext("\tcreate [-p] [-o property=value] ... "
 214                     "<filesystem>\n"
 215                     "\tcreate [-ps] [-b blocksize] [-o property=value] ... "
 216                     "-V <size> <volume>\n"));
 217         case HELP_DESTROY:
 218                 return (gettext("\tdestroy [-fnpRrv] <filesystem|volume>\n"
 219                     "\tdestroy [-dnpRrv] "
 220                     "<filesystem|volume>@<snap>[%<snap>][,...]\n"));
 221         case HELP_GET:
 222                 return (gettext("\tget [-rHp] [-d max] "
 223                     "[-o \"all\" | field[,...]] [-t type[,...]] "
 224                     "[-s source[,...]]\n"
 225                     "\t    <\"all\" | property[,...]> "
 226                     "[filesystem|volume|snapshot] ...\n"));
 227         case HELP_INHERIT:
 228                 return (gettext("\tinherit [-rS] <property> "
 229                     "<filesystem|volume|snapshot> ...\n"));
 230         case HELP_UPGRADE:
 231                 return (gettext("\tupgrade [-v]\n"
 232                     "\tupgrade [-r] [-V version] <-a | filesystem ...>\n"));
 233         case HELP_LIST:
 234                 return (gettext("\tlist [-rH][-d max] "
 235                     "[-o property[,...]] [-t type[,...]] [-s property] ...\n"
 236                     "\t    [-S property] ... "
 237                     "[filesystem|volume|snapshot] ...\n"));
 238         case HELP_MOUNT:
 239                 return (gettext("\tmount\n"
 240                     "\tmount [-vO] [-o opts] <-a | filesystem>\n"));
 241         case HELP_PROMOTE:
 242                 return (gettext("\tpromote <clone-filesystem>\n"));
 243         case HELP_RECEIVE:
 244                 return (gettext("\treceive [-vnFu] <filesystem|volume|"
 245                 "snapshot>\n"
 246                 "\treceive [-vnFu] [-d | -e] <filesystem>\n"));
 247         case HELP_RENAME:
 248                 return (gettext("\trename [-f] <filesystem|volume|snapshot> "
 249                     "<filesystem|volume|snapshot>\n"
 250                     "\trename [-f] -p <filesystem|volume> <filesystem|volume>\n"
 251                     "\trename -r <snapshot> <snapshot>"));
 252         case HELP_ROLLBACK:
 253                 return (gettext("\trollback [-rRf] <snapshot>\n"));
 254         case HELP_SEND:
 255                 return (gettext("\tsend [-DnPpRv] [-[iI] snapshot] "
 256                     "<snapshot>\n"));
 257         case HELP_SET:
 258                 return (gettext("\tset <property=value> "
 259                     "<filesystem|volume|snapshot> ...\n"));
 260         case HELP_SHARE:
 261                 return (gettext("\tshare <-a | filesystem>\n"));
 262         case HELP_SNAPSHOT:
 263                 return (gettext("\tsnapshot [-r] [-o property=value] ... "
 264                     "<filesystem@snapname|volume@snapname> ...\n"));
 265         case HELP_UNMOUNT:
 266                 return (gettext("\tunmount [-f] "
 267                     "<-a | filesystem|mountpoint>\n"));
 268         case HELP_UNSHARE:
 269                 return (gettext("\tunshare "
 270                     "<-a | filesystem|mountpoint>\n"));
 271         case HELP_ALLOW:
 272                 return (gettext("\tallow <filesystem|volume>\n"
 273                     "\tallow [-ldug] "
 274                     "<\"everyone\"|user|group>[,...] <perm|@setname>[,...]\n"
 275                     "\t    <filesystem|volume>\n"
 276                     "\tallow [-ld] -e <perm|@setname>[,...] "
 277                     "<filesystem|volume>\n"
 278                     "\tallow -c <perm|@setname>[,...] <filesystem|volume>\n"
 279                     "\tallow -s @setname <perm|@setname>[,...] "
 280                     "<filesystem|volume>\n"));
 281         case HELP_UNALLOW:
 282                 return (gettext("\tunallow [-rldug] "
 283                     "<\"everyone\"|user|group>[,...]\n"
 284                     "\t    [<perm|@setname>[,...]] <filesystem|volume>\n"
 285                     "\tunallow [-rld] -e [<perm|@setname>[,...]] "
 286                     "<filesystem|volume>\n"
 287                     "\tunallow [-r] -c [<perm|@setname>[,...]] "
 288                     "<filesystem|volume>\n"
 289                     "\tunallow [-r] -s @setname [<perm|@setname>[,...]] "
 290                     "<filesystem|volume>\n"));
 291         case HELP_USERSPACE:
 292                 return (gettext("\tuserspace [-Hinp] [-o field[,...]] "
 293                     "[-s field] ...\n\t[-S field] ... "
 294                     "[-t type[,...]] <filesystem|snapshot>\n"));
 295         case HELP_GROUPSPACE:
 296                 return (gettext("\tgroupspace [-Hinp] [-o field[,...]] "
 297                     "[-s field] ...\n\t[-S field] ... "
 298                     "[-t type[,...]] <filesystem|snapshot>\n"));
 299         case HELP_HOLD:
 300                 return (gettext("\thold [-r] <tag> <snapshot> ...\n"));
 301         case HELP_HOLDS:
 302                 return (gettext("\tholds [-r] <snapshot> ...\n"));
 303         case HELP_RELEASE:
 304                 return (gettext("\trelease [-r] <tag> <snapshot> ...\n"));
 305         case HELP_DIFF:
 306                 return (gettext("\tdiff [-FHt] <snapshot> "
 307                     "[snapshot|filesystem]\n"));
 308         }
 309 
 310         abort();
 311         /* NOTREACHED */
 312 }
 313 
 314 void
 315 nomem(void)
 316 {
 317         (void) fprintf(stderr, gettext("internal error: out of memory\n"));
 318         exit(1);
 319 }
 320 
 321 /*
 322  * Utility function to guarantee malloc() success.
 323  */
 324 
 325 void *
 326 safe_malloc(size_t size)
 327 {
 328         void *data;
 329 
 330         if ((data = calloc(1, size)) == NULL)
 331                 nomem();
 332 
 333         return (data);
 334 }
 335 
 336 static char *
 337 safe_strdup(char *str)
 338 {
 339         char *dupstr = strdup(str);
 340 
 341         if (dupstr == NULL)
 342                 nomem();
 343 
 344         return (dupstr);
 345 }
 346 
 347 /*
 348  * Callback routine that will print out information for each of
 349  * the properties.
 350  */
 351 static int
 352 usage_prop_cb(int prop, void *cb)
 353 {
 354         FILE *fp = cb;
 355 
 356         (void) fprintf(fp, "\t%-15s ", zfs_prop_to_name(prop));
 357 
 358         if (zfs_prop_readonly(prop))
 359                 (void) fprintf(fp, " NO    ");
 360         else
 361                 (void) fprintf(fp, "YES    ");
 362 
 363         if (zfs_prop_inheritable(prop))
 364                 (void) fprintf(fp, "  YES   ");
 365         else
 366                 (void) fprintf(fp, "   NO   ");
 367 
 368         if (zfs_prop_values(prop) == NULL)
 369                 (void) fprintf(fp, "-\n");
 370         else
 371                 (void) fprintf(fp, "%s\n", zfs_prop_values(prop));
 372 
 373         return (ZPROP_CONT);
 374 }
 375 
 376 /*
 377  * Display usage message.  If we're inside a command, display only the usage for
 378  * that command.  Otherwise, iterate over the entire command table and display
 379  * a complete usage message.
 380  */
 381 static void
 382 usage(boolean_t requested)
 383 {
 384         int i;
 385         boolean_t show_properties = B_FALSE;
 386         FILE *fp = requested ? stdout : stderr;
 387 
 388         if (current_command == NULL) {
 389 
 390                 (void) fprintf(fp, gettext("usage: zfs command args ...\n"));
 391                 (void) fprintf(fp,
 392                     gettext("where 'command' is one of the following:\n\n"));
 393 
 394                 for (i = 0; i < NCOMMAND; i++) {
 395                         if (command_table[i].name == NULL)
 396                                 (void) fprintf(fp, "\n");
 397                         else
 398                                 (void) fprintf(fp, "%s",
 399                                     get_usage(command_table[i].usage));
 400                 }
 401 
 402                 (void) fprintf(fp, gettext("\nEach dataset is of the form: "
 403                     "pool/[dataset/]*dataset[@name]\n"));
 404         } else {
 405                 (void) fprintf(fp, gettext("usage:\n"));
 406                 (void) fprintf(fp, "%s", get_usage(current_command->usage));
 407         }
 408 
 409         if (current_command != NULL &&
 410             (strcmp(current_command->name, "set") == 0 ||
 411             strcmp(current_command->name, "get") == 0 ||
 412             strcmp(current_command->name, "inherit") == 0 ||
 413             strcmp(current_command->name, "list") == 0))
 414                 show_properties = B_TRUE;
 415 
 416         if (show_properties) {
 417                 (void) fprintf(fp,
 418                     gettext("\nThe following properties are supported:\n"));
 419 
 420                 (void) fprintf(fp, "\n\t%-14s %s  %s   %s\n\n",
 421                     "PROPERTY", "EDIT", "INHERIT", "VALUES");
 422 
 423                 /* Iterate over all properties */
 424                 (void) zprop_iter(usage_prop_cb, fp, B_FALSE, B_TRUE,
 425                     ZFS_TYPE_DATASET);
 426 
 427                 (void) fprintf(fp, "\t%-15s ", "userused@...");
 428                 (void) fprintf(fp, " NO       NO   <size>\n");
 429                 (void) fprintf(fp, "\t%-15s ", "groupused@...");
 430                 (void) fprintf(fp, " NO       NO   <size>\n");
 431                 (void) fprintf(fp, "\t%-15s ", "userquota@...");
 432                 (void) fprintf(fp, "YES       NO   <size> | none\n");
 433                 (void) fprintf(fp, "\t%-15s ", "groupquota@...");
 434                 (void) fprintf(fp, "YES       NO   <size> | none\n");
 435                 (void) fprintf(fp, "\t%-15s ", "written@<snap>");
 436                 (void) fprintf(fp, " NO       NO   <size>\n");
 437 
 438                 (void) fprintf(fp, gettext("\nSizes are specified in bytes "
 439                     "with standard units such as K, M, G, etc.\n"));
 440                 (void) fprintf(fp, gettext("\nUser-defined properties can "
 441                     "be specified by using a name containing a colon (:).\n"));
 442                 (void) fprintf(fp, gettext("\nThe {user|group}{used|quota}@ "
 443                     "properties must be appended with\n"
 444                     "a user or group specifier of one of these forms:\n"
 445                     "    POSIX name      (eg: \"matt\")\n"
 446                     "    POSIX id        (eg: \"126829\")\n"
 447                     "    SMB name@domain (eg: \"matt@sun\")\n"
 448                     "    SMB SID         (eg: \"S-1-234-567-89\")\n"));
 449         } else {
 450                 (void) fprintf(fp,
 451                     gettext("\nFor the property list, run: %s\n"),
 452                     "zfs set|get");
 453                 (void) fprintf(fp,
 454                     gettext("\nFor the delegated permission list, run: %s\n"),
 455                     "zfs allow|unallow");
 456         }
 457 
 458         /*
 459          * See comments at end of main().
 460          */
 461         if (getenv("ZFS_ABORT") != NULL) {
 462                 (void) printf("dumping core by request\n");
 463                 abort();
 464         }
 465 
 466         exit(requested ? 0 : 2);
 467 }
 468 
 469 static int
 470 parseprop(nvlist_t *props)
 471 {
 472         char *propname = optarg;
 473         char *propval, *strval;
 474 
 475         if ((propval = strchr(propname, '=')) == NULL) {
 476                 (void) fprintf(stderr, gettext("missing "
 477                     "'=' for -o option\n"));
 478                 return (-1);
 479         }
 480         *propval = '\0';
 481         propval++;
 482         if (nvlist_lookup_string(props, propname, &strval) == 0) {
 483                 (void) fprintf(stderr, gettext("property '%s' "
 484                     "specified multiple times\n"), propname);
 485                 return (-1);
 486         }
 487         if (nvlist_add_string(props, propname, propval) != 0)
 488                 nomem();
 489         return (0);
 490 }
 491 
 492 static int
 493 parse_depth(char *opt, int *flags)
 494 {
 495         char *tmp;
 496         int depth;
 497 
 498         depth = (int)strtol(opt, &tmp, 0);
 499         if (*tmp) {
 500                 (void) fprintf(stderr,
 501                     gettext("%s is not an integer\n"), optarg);
 502                 usage(B_FALSE);
 503         }
 504         if (depth < 0) {
 505                 (void) fprintf(stderr,
 506                     gettext("Depth can not be negative.\n"));
 507                 usage(B_FALSE);
 508         }
 509         *flags |= (ZFS_ITER_DEPTH_LIMIT|ZFS_ITER_RECURSE);
 510         return (depth);
 511 }
 512 
 513 #define PROGRESS_DELAY 2                /* seconds */
 514 
 515 static char *pt_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";
 516 static time_t pt_begin;
 517 static char *pt_header = NULL;
 518 static boolean_t pt_shown;
 519 
 520 static void
 521 start_progress_timer(void)
 522 {
 523         pt_begin = time(NULL) + PROGRESS_DELAY;
 524         pt_shown = B_FALSE;
 525 }
 526 
 527 static void
 528 set_progress_header(char *header)
 529 {
 530         assert(pt_header == NULL);
 531         pt_header = safe_strdup(header);
 532         if (pt_shown) {
 533                 (void) printf("%s: ", header);
 534                 (void) fflush(stdout);
 535         }
 536 }
 537 
 538 static void
 539 update_progress(char *update)
 540 {
 541         if (!pt_shown && time(NULL) > pt_begin) {
 542                 int len = strlen(update);
 543 
 544                 (void) printf("%s: %s%*.*s", pt_header, update, len, len,
 545                     pt_reverse);
 546                 (void) fflush(stdout);
 547                 pt_shown = B_TRUE;
 548         } else if (pt_shown) {
 549                 int len = strlen(update);
 550 
 551                 (void) printf("%s%*.*s", update, len, len, pt_reverse);
 552                 (void) fflush(stdout);
 553         }
 554 }
 555 
 556 static void
 557 finish_progress(char *done)
 558 {
 559         if (pt_shown) {
 560                 (void) printf("%s\n", done);
 561                 (void) fflush(stdout);
 562         }
 563         free(pt_header);
 564         pt_header = NULL;
 565 }
 566 /*
 567  * zfs clone [-p] [-o prop=value] ... <snap> <fs | vol>
 568  *
 569  * Given an existing dataset, create a writable copy whose initial contents
 570  * are the same as the source.  The newly created dataset maintains a
 571  * dependency on the original; the original cannot be destroyed so long as
 572  * the clone exists.
 573  *
 574  * The '-p' flag creates all the non-existing ancestors of the target first.
 575  */
 576 static int
 577 zfs_do_clone(int argc, char **argv)
 578 {
 579         zfs_handle_t *zhp = NULL;
 580         boolean_t parents = B_FALSE;
 581         nvlist_t *props;
 582         int ret = 0;
 583         int c;
 584 
 585         if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
 586                 nomem();
 587 
 588         /* check options */
 589         while ((c = getopt(argc, argv, "o:p")) != -1) {
 590                 switch (c) {
 591                 case 'o':
 592                         if (parseprop(props))
 593                                 return (1);
 594                         break;
 595                 case 'p':
 596                         parents = B_TRUE;
 597                         break;
 598                 case '?':
 599                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
 600                             optopt);
 601                         goto usage;
 602                 }
 603         }
 604 
 605         argc -= optind;
 606         argv += optind;
 607 
 608         /* check number of arguments */
 609         if (argc < 1) {
 610                 (void) fprintf(stderr, gettext("missing source dataset "
 611                     "argument\n"));
 612                 goto usage;
 613         }
 614         if (argc < 2) {
 615                 (void) fprintf(stderr, gettext("missing target dataset "
 616                     "argument\n"));
 617                 goto usage;
 618         }
 619         if (argc > 2) {
 620                 (void) fprintf(stderr, gettext("too many arguments\n"));
 621                 goto usage;
 622         }
 623 
 624         /* open the source dataset */
 625         if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
 626                 return (1);
 627 
 628         if (parents && zfs_name_valid(argv[1], ZFS_TYPE_FILESYSTEM |
 629             ZFS_TYPE_VOLUME)) {
 630                 /*
 631                  * Now create the ancestors of the target dataset.  If the
 632                  * target already exists and '-p' option was used we should not
 633                  * complain.
 634                  */
 635                 if (zfs_dataset_exists(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM |
 636                     ZFS_TYPE_VOLUME))
 637                         return (0);
 638                 if (zfs_create_ancestors(g_zfs, argv[1]) != 0)
 639                         return (1);
 640         }
 641 
 642         /* pass to libzfs */
 643         ret = zfs_clone(zhp, argv[1], props);
 644 
 645         /* create the mountpoint if necessary */
 646         if (ret == 0) {
 647                 zfs_handle_t *clone;
 648 
 649                 clone = zfs_open(g_zfs, argv[1], ZFS_TYPE_DATASET);
 650                 if (clone != NULL) {
 651                         if (zfs_get_type(clone) != ZFS_TYPE_VOLUME)
 652                                 if ((ret = zfs_mount(clone, NULL, 0)) == 0)
 653                                         ret = zfs_share(clone);
 654                         zfs_close(clone);
 655                 }
 656         }
 657 
 658         zfs_close(zhp);
 659         nvlist_free(props);
 660 
 661         return (!!ret);
 662 
 663 usage:
 664         if (zhp)
 665                 zfs_close(zhp);
 666         nvlist_free(props);
 667         usage(B_FALSE);
 668         return (-1);
 669 }
 670 
 671 /*
 672  * zfs create [-p] [-o prop=value] ... fs
 673  * zfs create [-ps] [-b blocksize] [-o prop=value] ... -V vol size
 674  *
 675  * Create a new dataset.  This command can be used to create filesystems
 676  * and volumes.  Snapshot creation is handled by 'zfs snapshot'.
 677  * For volumes, the user must specify a size to be used.
 678  *
 679  * The '-s' flag applies only to volumes, and indicates that we should not try
 680  * to set the reservation for this volume.  By default we set a reservation
 681  * equal to the size for any volume.  For pools with SPA_VERSION >=
 682  * SPA_VERSION_REFRESERVATION, we set a refreservation instead.
 683  *
 684  * The '-p' flag creates all the non-existing ancestors of the target first.
 685  */
 686 static int
 687 zfs_do_create(int argc, char **argv)
 688 {
 689         zfs_type_t type = ZFS_TYPE_FILESYSTEM;
 690         zfs_handle_t *zhp = NULL;
 691         uint64_t volsize;
 692         int c;
 693         boolean_t noreserve = B_FALSE;
 694         boolean_t bflag = B_FALSE;
 695         boolean_t parents = B_FALSE;
 696         int ret = 1;
 697         nvlist_t *props;
 698         uint64_t intval;
 699         int canmount = ZFS_CANMOUNT_OFF;
 700 
 701         if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
 702                 nomem();
 703 
 704         /* check options */
 705         while ((c = getopt(argc, argv, ":V:b:so:p")) != -1) {
 706                 switch (c) {
 707                 case 'V':
 708                         type = ZFS_TYPE_VOLUME;
 709                         if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
 710                                 (void) fprintf(stderr, gettext("bad volume "
 711                                     "size '%s': %s\n"), optarg,
 712                                     libzfs_error_description(g_zfs));
 713                                 goto error;
 714                         }
 715 
 716                         if (nvlist_add_uint64(props,
 717                             zfs_prop_to_name(ZFS_PROP_VOLSIZE), intval) != 0)
 718                                 nomem();
 719                         volsize = intval;
 720                         break;
 721                 case 'p':
 722                         parents = B_TRUE;
 723                         break;
 724                 case 'b':
 725                         bflag = B_TRUE;
 726                         if (zfs_nicestrtonum(g_zfs, optarg, &intval) != 0) {
 727                                 (void) fprintf(stderr, gettext("bad volume "
 728                                     "block size '%s': %s\n"), optarg,
 729                                     libzfs_error_description(g_zfs));
 730                                 goto error;
 731                         }
 732 
 733                         if (nvlist_add_uint64(props,
 734                             zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
 735                             intval) != 0)
 736                                 nomem();
 737                         break;
 738                 case 'o':
 739                         if (parseprop(props))
 740                                 goto error;
 741                         break;
 742                 case 's':
 743                         noreserve = B_TRUE;
 744                         break;
 745                 case ':':
 746                         (void) fprintf(stderr, gettext("missing size "
 747                             "argument\n"));
 748                         goto badusage;
 749                 case '?':
 750                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
 751                             optopt);
 752                         goto badusage;
 753                 }
 754         }
 755 
 756         if ((bflag || noreserve) && type != ZFS_TYPE_VOLUME) {
 757                 (void) fprintf(stderr, gettext("'-s' and '-b' can only be "
 758                     "used when creating a volume\n"));
 759                 goto badusage;
 760         }
 761 
 762         argc -= optind;
 763         argv += optind;
 764 
 765         /* check number of arguments */
 766         if (argc == 0) {
 767                 (void) fprintf(stderr, gettext("missing %s argument\n"),
 768                     zfs_type_to_name(type));
 769                 goto badusage;
 770         }
 771         if (argc > 1) {
 772                 (void) fprintf(stderr, gettext("too many arguments\n"));
 773                 goto badusage;
 774         }
 775 
 776         if (type == ZFS_TYPE_VOLUME && !noreserve) {
 777                 zpool_handle_t *zpool_handle;
 778                 uint64_t spa_version;
 779                 char *p;
 780                 zfs_prop_t resv_prop;
 781                 char *strval;
 782 
 783                 if (p = strchr(argv[0], '/'))
 784                         *p = '\0';
 785                 zpool_handle = zpool_open(g_zfs, argv[0]);
 786                 if (p != NULL)
 787                         *p = '/';
 788                 if (zpool_handle == NULL)
 789                         goto error;
 790                 spa_version = zpool_get_prop_int(zpool_handle,
 791                     ZPOOL_PROP_VERSION, NULL);
 792                 zpool_close(zpool_handle);
 793                 if (spa_version >= SPA_VERSION_REFRESERVATION)
 794                         resv_prop = ZFS_PROP_REFRESERVATION;
 795                 else
 796                         resv_prop = ZFS_PROP_RESERVATION;
 797                 volsize = zvol_volsize_to_reservation(volsize, props);
 798 
 799                 if (nvlist_lookup_string(props, zfs_prop_to_name(resv_prop),
 800                     &strval) != 0) {
 801                         if (nvlist_add_uint64(props,
 802                             zfs_prop_to_name(resv_prop), volsize) != 0) {
 803                                 nvlist_free(props);
 804                                 nomem();
 805                         }
 806                 }
 807         }
 808 
 809         if (parents && zfs_name_valid(argv[0], type)) {
 810                 /*
 811                  * Now create the ancestors of target dataset.  If the target
 812                  * already exists and '-p' option was used we should not
 813                  * complain.
 814                  */
 815                 if (zfs_dataset_exists(g_zfs, argv[0], type)) {
 816                         ret = 0;
 817                         goto error;
 818                 }
 819                 if (zfs_create_ancestors(g_zfs, argv[0]) != 0)
 820                         goto error;
 821         }
 822 
 823         /* pass to libzfs */
 824         if (zfs_create(g_zfs, argv[0], type, props) != 0)
 825                 goto error;
 826 
 827         if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == NULL)
 828                 goto error;
 829 
 830         ret = 0;
 831         /*
 832          * if the user doesn't want the dataset automatically mounted,
 833          * then skip the mount/share step
 834          */
 835         if (zfs_prop_valid_for_type(ZFS_PROP_CANMOUNT, type))
 836                 canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
 837 
 838         /*
 839          * Mount and/or share the new filesystem as appropriate.  We provide a
 840          * verbose error message to let the user know that their filesystem was
 841          * in fact created, even if we failed to mount or share it.
 842          */
 843         if (canmount == ZFS_CANMOUNT_ON) {
 844                 if (zfs_mount(zhp, NULL, 0) != 0) {
 845                         (void) fprintf(stderr, gettext("filesystem "
 846                             "successfully created, but not mounted\n"));
 847                         ret = 1;
 848                 } else if (zfs_share(zhp) != 0) {
 849                         (void) fprintf(stderr, gettext("filesystem "
 850                             "successfully created, but not shared\n"));
 851                         ret = 1;
 852                 }
 853         }
 854 
 855 error:
 856         if (zhp)
 857                 zfs_close(zhp);
 858         nvlist_free(props);
 859         return (ret);
 860 badusage:
 861         nvlist_free(props);
 862         usage(B_FALSE);
 863         return (2);
 864 }
 865 
 866 /*
 867  * zfs destroy [-rRf] <fs, vol>
 868  * zfs destroy [-rRd] <snap>
 869  *
 870  *      -r      Recursively destroy all children
 871  *      -R      Recursively destroy all dependents, including clones
 872  *      -f      Force unmounting of any dependents
 873  *      -d      If we can't destroy now, mark for deferred destruction
 874  *
 875  * Destroys the given dataset.  By default, it will unmount any filesystems,
 876  * and refuse to destroy a dataset that has any dependents.  A dependent can
 877  * either be a child, or a clone of a child.
 878  */
 879 typedef struct destroy_cbdata {
 880         boolean_t       cb_first;
 881         boolean_t       cb_force;
 882         boolean_t       cb_recurse;
 883         boolean_t       cb_error;
 884         boolean_t       cb_doclones;
 885         zfs_handle_t    *cb_target;
 886         boolean_t       cb_defer_destroy;
 887         boolean_t       cb_verbose;
 888         boolean_t       cb_parsable;
 889         boolean_t       cb_dryrun;
 890         nvlist_t        *cb_nvl;
 891 
 892         /* first snap in contiguous run */
 893         char            *cb_firstsnap;
 894         /* previous snap in contiguous run */
 895         char            *cb_prevsnap;
 896         int64_t         cb_snapused;
 897         char            *cb_snapspec;
 898 } destroy_cbdata_t;
 899 
 900 /*
 901  * Check for any dependents based on the '-r' or '-R' flags.
 902  */
 903 static int
 904 destroy_check_dependent(zfs_handle_t *zhp, void *data)
 905 {
 906         destroy_cbdata_t *cbp = data;
 907         const char *tname = zfs_get_name(cbp->cb_target);
 908         const char *name = zfs_get_name(zhp);
 909 
 910         if (strncmp(tname, name, strlen(tname)) == 0 &&
 911             (name[strlen(tname)] == '/' || name[strlen(tname)] == '@')) {
 912                 /*
 913                  * This is a direct descendant, not a clone somewhere else in
 914                  * the hierarchy.
 915                  */
 916                 if (cbp->cb_recurse)
 917                         goto out;
 918 
 919                 if (cbp->cb_first) {
 920                         (void) fprintf(stderr, gettext("cannot destroy '%s': "
 921                             "%s has children\n"),
 922                             zfs_get_name(cbp->cb_target),
 923                             zfs_type_to_name(zfs_get_type(cbp->cb_target)));
 924                         (void) fprintf(stderr, gettext("use '-r' to destroy "
 925                             "the following datasets:\n"));
 926                         cbp->cb_first = B_FALSE;
 927                         cbp->cb_error = B_TRUE;
 928                 }
 929 
 930                 (void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
 931         } else {
 932                 /*
 933                  * This is a clone.  We only want to report this if the '-r'
 934                  * wasn't specified, or the target is a snapshot.
 935                  */
 936                 if (!cbp->cb_recurse &&
 937                     zfs_get_type(cbp->cb_target) != ZFS_TYPE_SNAPSHOT)
 938                         goto out;
 939 
 940                 if (cbp->cb_first) {
 941                         (void) fprintf(stderr, gettext("cannot destroy '%s': "
 942                             "%s has dependent clones\n"),
 943                             zfs_get_name(cbp->cb_target),
 944                             zfs_type_to_name(zfs_get_type(cbp->cb_target)));
 945                         (void) fprintf(stderr, gettext("use '-R' to destroy "
 946                             "the following datasets:\n"));
 947                         cbp->cb_first = B_FALSE;
 948                         cbp->cb_error = B_TRUE;
 949                         cbp->cb_dryrun = B_TRUE;
 950                 }
 951 
 952                 (void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
 953         }
 954 
 955 out:
 956         zfs_close(zhp);
 957         return (0);
 958 }
 959 
 960 static int
 961 destroy_callback(zfs_handle_t *zhp, void *data)
 962 {
 963         destroy_cbdata_t *cb = data;
 964         const char *name = zfs_get_name(zhp);
 965 
 966         if (cb->cb_verbose) {
 967                 if (cb->cb_parsable) {
 968                         (void) printf("destroy\t%s\n", name);
 969                 } else if (cb->cb_dryrun) {
 970                         (void) printf(gettext("would destroy %s\n"),
 971                             name);
 972                 } else {
 973                         (void) printf(gettext("will destroy %s\n"),
 974                             name);
 975                 }
 976         }
 977 
 978         /*
 979          * Ignore pools (which we've already flagged as an error before getting
 980          * here).
 981          */
 982         if (strchr(zfs_get_name(zhp), '/') == NULL &&
 983             zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
 984                 zfs_close(zhp);
 985                 return (0);
 986         }
 987 
 988         if (!cb->cb_dryrun) {
 989                 if (zfs_unmount(zhp, NULL, cb->cb_force ? MS_FORCE : 0) != 0 ||
 990                     zfs_destroy(zhp, cb->cb_defer_destroy) != 0) {
 991                         zfs_close(zhp);
 992                         return (-1);
 993                 }
 994         }
 995 
 996         zfs_close(zhp);
 997         return (0);
 998 }
 999 
1000 static int
1001 destroy_print_cb(zfs_handle_t *zhp, void *arg)
1002 {
1003         destroy_cbdata_t *cb = arg;
1004         const char *name = zfs_get_name(zhp);
1005         int err = 0;
1006 
1007         if (nvlist_exists(cb->cb_nvl, name)) {
1008                 if (cb->cb_firstsnap == NULL)
1009                         cb->cb_firstsnap = strdup(name);
1010                 if (cb->cb_prevsnap != NULL)
1011                         free(cb->cb_prevsnap);
1012                 /* this snap continues the current range */
1013                 cb->cb_prevsnap = strdup(name);
1014                 if (cb->cb_firstsnap == NULL || cb->cb_prevsnap == NULL)
1015                         nomem();
1016                 if (cb->cb_verbose) {
1017                         if (cb->cb_parsable) {
1018                                 (void) printf("destroy\t%s\n", name);
1019                         } else if (cb->cb_dryrun) {
1020                                 (void) printf(gettext("would destroy %s\n"),
1021                                     name);
1022                         } else {
1023                                 (void) printf(gettext("will destroy %s\n"),
1024                                     name);
1025                         }
1026                 }
1027         } else if (cb->cb_firstsnap != NULL) {
1028                 /* end of this range */
1029                 uint64_t used = 0;
1030                 err = lzc_snaprange_space(cb->cb_firstsnap,
1031                     cb->cb_prevsnap, &used);
1032                 cb->cb_snapused += used;
1033                 free(cb->cb_firstsnap);
1034                 cb->cb_firstsnap = NULL;
1035                 free(cb->cb_prevsnap);
1036                 cb->cb_prevsnap = NULL;
1037         }
1038         zfs_close(zhp);
1039         return (err);
1040 }
1041 
1042 static int
1043 destroy_print_snapshots(zfs_handle_t *fs_zhp, destroy_cbdata_t *cb)
1044 {
1045         int err = 0;
1046         assert(cb->cb_firstsnap == NULL);
1047         assert(cb->cb_prevsnap == NULL);
1048         err = zfs_iter_snapshots_sorted(fs_zhp, destroy_print_cb, cb);
1049         if (cb->cb_firstsnap != NULL) {
1050                 uint64_t used = 0;
1051                 if (err == 0) {
1052                         err = lzc_snaprange_space(cb->cb_firstsnap,
1053                             cb->cb_prevsnap, &used);
1054                 }
1055                 cb->cb_snapused += used;
1056                 free(cb->cb_firstsnap);
1057                 cb->cb_firstsnap = NULL;
1058                 free(cb->cb_prevsnap);
1059                 cb->cb_prevsnap = NULL;
1060         }
1061         return (err);
1062 }
1063 
1064 static int
1065 snapshot_to_nvl_cb(zfs_handle_t *zhp, void *arg)
1066 {
1067         destroy_cbdata_t *cb = arg;
1068         int err = 0;
1069 
1070         /* Check for clones. */
1071         if (!cb->cb_doclones && !cb->cb_defer_destroy) {
1072                 cb->cb_target = zhp;
1073                 cb->cb_first = B_TRUE;
1074                 err = zfs_iter_dependents(zhp, B_TRUE,
1075                     destroy_check_dependent, cb);
1076         }
1077 
1078         if (err == 0) {
1079                 if (nvlist_add_boolean(cb->cb_nvl, zfs_get_name(zhp)))
1080                         nomem();
1081         }
1082         zfs_close(zhp);
1083         return (err);
1084 }
1085 
1086 static int
1087 gather_snapshots(zfs_handle_t *zhp, void *arg)
1088 {
1089         destroy_cbdata_t *cb = arg;
1090         int err = 0;
1091 
1092         err = zfs_iter_snapspec(zhp, cb->cb_snapspec, snapshot_to_nvl_cb, cb);
1093         if (err == ENOENT)
1094                 err = 0;
1095         if (err != 0)
1096                 goto out;
1097 
1098         if (cb->cb_verbose) {
1099                 err = destroy_print_snapshots(zhp, cb);
1100                 if (err != 0)
1101                         goto out;
1102         }
1103 
1104         if (cb->cb_recurse)
1105                 err = zfs_iter_filesystems(zhp, gather_snapshots, cb);
1106 
1107 out:
1108         zfs_close(zhp);
1109         return (err);
1110 }
1111 
1112 static int
1113 destroy_clones(destroy_cbdata_t *cb)
1114 {
1115         nvpair_t *pair;
1116         for (pair = nvlist_next_nvpair(cb->cb_nvl, NULL);
1117             pair != NULL;
1118             pair = nvlist_next_nvpair(cb->cb_nvl, pair)) {
1119                 zfs_handle_t *zhp = zfs_open(g_zfs, nvpair_name(pair),
1120                     ZFS_TYPE_SNAPSHOT);
1121                 if (zhp != NULL) {
1122                         boolean_t defer = cb->cb_defer_destroy;
1123                         int err = 0;
1124 
1125                         /*
1126                          * We can't defer destroy non-snapshots, so set it to
1127                          * false while destroying the clones.
1128                          */
1129                         cb->cb_defer_destroy = B_FALSE;
1130                         err = zfs_iter_dependents(zhp, B_FALSE,
1131                             destroy_callback, cb);
1132                         cb->cb_defer_destroy = defer;
1133                         zfs_close(zhp);
1134                         if (err != 0)
1135                                 return (err);
1136                 }
1137         }
1138         return (0);
1139 }
1140 
1141 static int
1142 zfs_do_destroy(int argc, char **argv)
1143 {
1144         destroy_cbdata_t cb = { 0 };
1145         int c;
1146         zfs_handle_t *zhp;
1147         char *at;
1148         zfs_type_t type = ZFS_TYPE_DATASET;
1149 
1150         /* check options */
1151         while ((c = getopt(argc, argv, "vpndfrR")) != -1) {
1152                 switch (c) {
1153                 case 'v':
1154                         cb.cb_verbose = B_TRUE;
1155                         break;
1156                 case 'p':
1157                         cb.cb_verbose = B_TRUE;
1158                         cb.cb_parsable = B_TRUE;
1159                         break;
1160                 case 'n':
1161                         cb.cb_dryrun = B_TRUE;
1162                         break;
1163                 case 'd':
1164                         cb.cb_defer_destroy = B_TRUE;
1165                         type = ZFS_TYPE_SNAPSHOT;
1166                         break;
1167                 case 'f':
1168                         cb.cb_force = B_TRUE;
1169                         break;
1170                 case 'r':
1171                         cb.cb_recurse = B_TRUE;
1172                         break;
1173                 case 'R':
1174                         cb.cb_recurse = B_TRUE;
1175                         cb.cb_doclones = B_TRUE;
1176                         break;
1177                 case '?':
1178                 default:
1179                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
1180                             optopt);
1181                         usage(B_FALSE);
1182                 }
1183         }
1184 
1185         argc -= optind;
1186         argv += optind;
1187 
1188         /* check number of arguments */
1189         if (argc == 0) {
1190                 (void) fprintf(stderr, gettext("missing dataset argument\n"));
1191                 usage(B_FALSE);
1192         }
1193         if (argc > 1) {
1194                 (void) fprintf(stderr, gettext("too many arguments\n"));
1195                 usage(B_FALSE);
1196         }
1197 
1198         at = strchr(argv[0], '@');
1199         if (at != NULL) {
1200                 int err = 0;
1201 
1202                 /* Build the list of snaps to destroy in cb_nvl. */
1203                 if (nvlist_alloc(&cb.cb_nvl, NV_UNIQUE_NAME, 0) != 0)
1204                         nomem();
1205 
1206                 *at = '\0';
1207                 zhp = zfs_open(g_zfs, argv[0],
1208                     ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
1209                 if (zhp == NULL)
1210                         return (1);
1211 
1212                 cb.cb_snapspec = at + 1;
1213                 if (gather_snapshots(zfs_handle_dup(zhp), &cb) != 0 ||
1214                     cb.cb_error) {
1215                         zfs_close(zhp);
1216                         nvlist_free(cb.cb_nvl);
1217                         return (1);
1218                 }
1219 
1220                 if (nvlist_empty(cb.cb_nvl)) {
1221                         (void) fprintf(stderr, gettext("could not find any "
1222                             "snapshots to destroy; check snapshot names.\n"));
1223                         zfs_close(zhp);
1224                         nvlist_free(cb.cb_nvl);
1225                         return (1);
1226                 }
1227 
1228                 if (cb.cb_verbose) {
1229                         char buf[16];
1230                         zfs_nicenum(cb.cb_snapused, buf, sizeof (buf));
1231                         if (cb.cb_parsable) {
1232                                 (void) printf("reclaim\t%llu\n",
1233                                     cb.cb_snapused);
1234                         } else if (cb.cb_dryrun) {
1235                                 (void) printf(gettext("would reclaim %s\n"),
1236                                     buf);
1237                         } else {
1238                                 (void) printf(gettext("will reclaim %s\n"),
1239                                     buf);
1240                         }
1241                 }
1242 
1243                 if (!cb.cb_dryrun) {
1244                         if (cb.cb_doclones)
1245                                 err = destroy_clones(&cb);
1246                         if (err == 0) {
1247                                 err = zfs_destroy_snaps_nvl(zhp, cb.cb_nvl,
1248                                     cb.cb_defer_destroy);
1249                         }
1250                 }
1251 
1252                 zfs_close(zhp);
1253                 nvlist_free(cb.cb_nvl);
1254                 if (err != 0)
1255                         return (1);
1256         } else {
1257                 /* Open the given dataset */
1258                 if ((zhp = zfs_open(g_zfs, argv[0], type)) == NULL)
1259                         return (1);
1260 
1261                 cb.cb_target = zhp;
1262 
1263                 /*
1264                  * Perform an explicit check for pools before going any further.
1265                  */
1266                 if (!cb.cb_recurse && strchr(zfs_get_name(zhp), '/') == NULL &&
1267                     zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) {
1268                         (void) fprintf(stderr, gettext("cannot destroy '%s': "
1269                             "operation does not apply to pools\n"),
1270                             zfs_get_name(zhp));
1271                         (void) fprintf(stderr, gettext("use 'zfs destroy -r "
1272                             "%s' to destroy all datasets in the pool\n"),
1273                             zfs_get_name(zhp));
1274                         (void) fprintf(stderr, gettext("use 'zpool destroy %s' "
1275                             "to destroy the pool itself\n"), zfs_get_name(zhp));
1276                         zfs_close(zhp);
1277                         return (1);
1278                 }
1279 
1280                 /*
1281                  * Check for any dependents and/or clones.
1282                  */
1283                 cb.cb_first = B_TRUE;
1284                 if (!cb.cb_doclones &&
1285                     zfs_iter_dependents(zhp, B_TRUE, destroy_check_dependent,
1286                     &cb) != 0) {
1287                         zfs_close(zhp);
1288                         return (1);
1289                 }
1290 
1291                 if (cb.cb_error) {
1292                         zfs_close(zhp);
1293                         return (1);
1294                 }
1295 
1296                 if (zfs_iter_dependents(zhp, B_FALSE, destroy_callback,
1297                     &cb) != 0) {
1298                         zfs_close(zhp);
1299                         return (1);
1300                 }
1301 
1302                 /*
1303                  * Do the real thing.  The callback will close the
1304                  * handle regardless of whether it succeeds or not.
1305                  */
1306                 if (destroy_callback(zhp, &cb) != 0)
1307                         return (1);
1308         }
1309 
1310         return (0);
1311 }
1312 
1313 static boolean_t
1314 is_recvd_column(zprop_get_cbdata_t *cbp)
1315 {
1316         int i;
1317         zfs_get_column_t col;
1318 
1319         for (i = 0; i < ZFS_GET_NCOLS &&
1320             (col = cbp->cb_columns[i]) != GET_COL_NONE; i++)
1321                 if (col == GET_COL_RECVD)
1322                         return (B_TRUE);
1323         return (B_FALSE);
1324 }
1325 
1326 /*
1327  * zfs get [-rHp] [-o all | field[,field]...] [-s source[,source]...]
1328  *      < all | property[,property]... > < fs | snap | vol > ...
1329  *
1330  *      -r      recurse over any child datasets
1331  *      -H      scripted mode.  Headers are stripped, and fields are separated
1332  *              by tabs instead of spaces.
1333  *      -o      Set of fields to display.  One of "name,property,value,
1334  *              received,source". Default is "name,property,value,source".
1335  *              "all" is an alias for all five.
1336  *      -s      Set of sources to allow.  One of
1337  *              "local,default,inherited,received,temporary,none".  Default is
1338  *              all six.
1339  *      -p      Display values in parsable (literal) format.
1340  *
1341  *  Prints properties for the given datasets.  The user can control which
1342  *  columns to display as well as which property types to allow.
1343  */
1344 
1345 /*
1346  * Invoked to display the properties for a single dataset.
1347  */
1348 static int
1349 get_callback(zfs_handle_t *zhp, void *data)
1350 {
1351         char buf[ZFS_MAXPROPLEN];
1352         char rbuf[ZFS_MAXPROPLEN];
1353         zprop_source_t sourcetype;
1354         char source[ZFS_MAXNAMELEN];
1355         zprop_get_cbdata_t *cbp = data;
1356         nvlist_t *user_props = zfs_get_user_props(zhp);
1357         zprop_list_t *pl = cbp->cb_proplist;
1358         nvlist_t *propval;
1359         char *strval;
1360         char *sourceval;
1361         boolean_t received = is_recvd_column(cbp);
1362 
1363         for (; pl != NULL; pl = pl->pl_next) {
1364                 char *recvdval = NULL;
1365                 /*
1366                  * Skip the special fake placeholder.  This will also skip over
1367                  * the name property when 'all' is specified.
1368                  */
1369                 if (pl->pl_prop == ZFS_PROP_NAME &&
1370                     pl == cbp->cb_proplist)
1371                         continue;
1372 
1373                 if (pl->pl_prop != ZPROP_INVAL) {
1374                         if (zfs_prop_get(zhp, pl->pl_prop, buf,
1375                             sizeof (buf), &sourcetype, source,
1376                             sizeof (source),
1377                             cbp->cb_literal) != 0) {
1378                                 if (pl->pl_all)
1379                                         continue;
1380                                 if (!zfs_prop_valid_for_type(pl->pl_prop,
1381                                     ZFS_TYPE_DATASET)) {
1382                                         (void) fprintf(stderr,
1383                                             gettext("No such property '%s'\n"),
1384                                             zfs_prop_to_name(pl->pl_prop));
1385                                         continue;
1386                                 }
1387                                 sourcetype = ZPROP_SRC_NONE;
1388                                 (void) strlcpy(buf, "-", sizeof (buf));
1389                         }
1390 
1391                         if (received && (zfs_prop_get_recvd(zhp,
1392                             zfs_prop_to_name(pl->pl_prop), rbuf, sizeof (rbuf),
1393                             cbp->cb_literal) == 0))
1394                                 recvdval = rbuf;
1395 
1396                         zprop_print_one_property(zfs_get_name(zhp), cbp,
1397                             zfs_prop_to_name(pl->pl_prop),
1398                             buf, sourcetype, source, recvdval);
1399                 } else if (zfs_prop_userquota(pl->pl_user_prop)) {
1400                         sourcetype = ZPROP_SRC_LOCAL;
1401 
1402                         if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
1403                             buf, sizeof (buf), cbp->cb_literal) != 0) {
1404                                 sourcetype = ZPROP_SRC_NONE;
1405                                 (void) strlcpy(buf, "-", sizeof (buf));
1406                         }
1407 
1408                         zprop_print_one_property(zfs_get_name(zhp), cbp,
1409                             pl->pl_user_prop, buf, sourcetype, source, NULL);
1410                 } else if (zfs_prop_written(pl->pl_user_prop)) {
1411                         sourcetype = ZPROP_SRC_LOCAL;
1412 
1413                         if (zfs_prop_get_written(zhp, pl->pl_user_prop,
1414                             buf, sizeof (buf), cbp->cb_literal) != 0) {
1415                                 sourcetype = ZPROP_SRC_NONE;
1416                                 (void) strlcpy(buf, "-", sizeof (buf));
1417                         }
1418 
1419                         zprop_print_one_property(zfs_get_name(zhp), cbp,
1420                             pl->pl_user_prop, buf, sourcetype, source, NULL);
1421                 } else {
1422                         if (nvlist_lookup_nvlist(user_props,
1423                             pl->pl_user_prop, &propval) != 0) {
1424                                 if (pl->pl_all)
1425                                         continue;
1426                                 sourcetype = ZPROP_SRC_NONE;
1427                                 strval = "-";
1428                         } else {
1429                                 verify(nvlist_lookup_string(propval,
1430                                     ZPROP_VALUE, &strval) == 0);
1431                                 verify(nvlist_lookup_string(propval,
1432                                     ZPROP_SOURCE, &sourceval) == 0);
1433 
1434                                 if (strcmp(sourceval,
1435                                     zfs_get_name(zhp)) == 0) {
1436                                         sourcetype = ZPROP_SRC_LOCAL;
1437                                 } else if (strcmp(sourceval,
1438                                     ZPROP_SOURCE_VAL_RECVD) == 0) {
1439                                         sourcetype = ZPROP_SRC_RECEIVED;
1440                                 } else {
1441                                         sourcetype = ZPROP_SRC_INHERITED;
1442                                         (void) strlcpy(source,
1443                                             sourceval, sizeof (source));
1444                                 }
1445                         }
1446 
1447                         if (received && (zfs_prop_get_recvd(zhp,
1448                             pl->pl_user_prop, rbuf, sizeof (rbuf),
1449                             cbp->cb_literal) == 0))
1450                                 recvdval = rbuf;
1451 
1452                         zprop_print_one_property(zfs_get_name(zhp), cbp,
1453                             pl->pl_user_prop, strval, sourcetype,
1454                             source, recvdval);
1455                 }
1456         }
1457 
1458         return (0);
1459 }
1460 
1461 static int
1462 zfs_do_get(int argc, char **argv)
1463 {
1464         zprop_get_cbdata_t cb = { 0 };
1465         int i, c, flags = ZFS_ITER_ARGS_CAN_BE_PATHS;
1466         int types = ZFS_TYPE_DATASET;
1467         char *value, *fields;
1468         int ret = 0;
1469         int limit = 0;
1470         zprop_list_t fake_name = { 0 };
1471 
1472         /*
1473          * Set up default columns and sources.
1474          */
1475         cb.cb_sources = ZPROP_SRC_ALL;
1476         cb.cb_columns[0] = GET_COL_NAME;
1477         cb.cb_columns[1] = GET_COL_PROPERTY;
1478         cb.cb_columns[2] = GET_COL_VALUE;
1479         cb.cb_columns[3] = GET_COL_SOURCE;
1480         cb.cb_type = ZFS_TYPE_DATASET;
1481 
1482         /* check options */
1483         while ((c = getopt(argc, argv, ":d:o:s:rt:Hp")) != -1) {
1484                 switch (c) {
1485                 case 'p':
1486                         cb.cb_literal = B_TRUE;
1487                         break;
1488                 case 'd':
1489                         limit = parse_depth(optarg, &flags);
1490                         break;
1491                 case 'r':
1492                         flags |= ZFS_ITER_RECURSE;
1493                         break;
1494                 case 'H':
1495                         cb.cb_scripted = B_TRUE;
1496                         break;
1497                 case ':':
1498                         (void) fprintf(stderr, gettext("missing argument for "
1499                             "'%c' option\n"), optopt);
1500                         usage(B_FALSE);
1501                         break;
1502                 case 'o':
1503                         /*
1504                          * Process the set of columns to display.  We zero out
1505                          * the structure to give us a blank slate.
1506                          */
1507                         bzero(&cb.cb_columns, sizeof (cb.cb_columns));
1508                         i = 0;
1509                         while (*optarg != '\0') {
1510                                 static char *col_subopts[] =
1511                                     { "name", "property", "value", "received",
1512                                     "source", "all", NULL };
1513 
1514                                 if (i == ZFS_GET_NCOLS) {
1515                                         (void) fprintf(stderr, gettext("too "
1516                                             "many fields given to -o "
1517                                             "option\n"));
1518                                         usage(B_FALSE);
1519                                 }
1520 
1521                                 switch (getsubopt(&optarg, col_subopts,
1522                                     &value)) {
1523                                 case 0:
1524                                         cb.cb_columns[i++] = GET_COL_NAME;
1525                                         break;
1526                                 case 1:
1527                                         cb.cb_columns[i++] = GET_COL_PROPERTY;
1528                                         break;
1529                                 case 2:
1530                                         cb.cb_columns[i++] = GET_COL_VALUE;
1531                                         break;
1532                                 case 3:
1533                                         cb.cb_columns[i++] = GET_COL_RECVD;
1534                                         flags |= ZFS_ITER_RECVD_PROPS;
1535                                         break;
1536                                 case 4:
1537                                         cb.cb_columns[i++] = GET_COL_SOURCE;
1538                                         break;
1539                                 case 5:
1540                                         if (i > 0) {
1541                                                 (void) fprintf(stderr,
1542                                                     gettext("\"all\" conflicts "
1543                                                     "with specific fields "
1544                                                     "given to -o option\n"));
1545                                                 usage(B_FALSE);
1546                                         }
1547                                         cb.cb_columns[0] = GET_COL_NAME;
1548                                         cb.cb_columns[1] = GET_COL_PROPERTY;
1549                                         cb.cb_columns[2] = GET_COL_VALUE;
1550                                         cb.cb_columns[3] = GET_COL_RECVD;
1551                                         cb.cb_columns[4] = GET_COL_SOURCE;
1552                                         flags |= ZFS_ITER_RECVD_PROPS;
1553                                         i = ZFS_GET_NCOLS;
1554                                         break;
1555                                 default:
1556                                         (void) fprintf(stderr,
1557                                             gettext("invalid column name "
1558                                             "'%s'\n"), value);
1559                                         usage(B_FALSE);
1560                                 }
1561                         }
1562                         break;
1563 
1564                 case 's':
1565                         cb.cb_sources = 0;
1566                         while (*optarg != '\0') {
1567                                 static char *source_subopts[] = {
1568                                         "local", "default", "inherited",
1569                                         "received", "temporary", "none",
1570                                         NULL };
1571 
1572                                 switch (getsubopt(&optarg, source_subopts,
1573                                     &value)) {
1574                                 case 0:
1575                                         cb.cb_sources |= ZPROP_SRC_LOCAL;
1576                                         break;
1577                                 case 1:
1578                                         cb.cb_sources |= ZPROP_SRC_DEFAULT;
1579                                         break;
1580                                 case 2:
1581                                         cb.cb_sources |= ZPROP_SRC_INHERITED;
1582                                         break;
1583                                 case 3:
1584                                         cb.cb_sources |= ZPROP_SRC_RECEIVED;
1585                                         break;
1586                                 case 4:
1587                                         cb.cb_sources |= ZPROP_SRC_TEMPORARY;
1588                                         break;
1589                                 case 5:
1590                                         cb.cb_sources |= ZPROP_SRC_NONE;
1591                                         break;
1592                                 default:
1593                                         (void) fprintf(stderr,
1594                                             gettext("invalid source "
1595                                             "'%s'\n"), value);
1596                                         usage(B_FALSE);
1597                                 }
1598                         }
1599                         break;
1600 
1601                 case 't':
1602                         types = 0;
1603                         flags &= ~ZFS_ITER_PROP_LISTSNAPS;
1604                         while (*optarg != '\0') {
1605                                 static char *type_subopts[] = { "filesystem",
1606                                     "volume", "snapshot", "all", NULL };
1607 
1608                                 switch (getsubopt(&optarg, type_subopts,
1609                                     &value)) {
1610                                 case 0:
1611                                         types |= ZFS_TYPE_FILESYSTEM;
1612                                         break;
1613                                 case 1:
1614                                         types |= ZFS_TYPE_VOLUME;
1615                                         break;
1616                                 case 2:
1617                                         types |= ZFS_TYPE_SNAPSHOT;
1618                                         break;
1619                                 case 3:
1620                                         types = ZFS_TYPE_DATASET;
1621                                         break;
1622 
1623                                 default:
1624                                         (void) fprintf(stderr,
1625                                             gettext("invalid type '%s'\n"),
1626                                             value);
1627                                         usage(B_FALSE);
1628                                 }
1629                         }
1630                         break;
1631 
1632                 case '?':
1633                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
1634                             optopt);
1635                         usage(B_FALSE);
1636                 }
1637         }
1638 
1639         argc -= optind;
1640         argv += optind;
1641 
1642         if (argc < 1) {
1643                 (void) fprintf(stderr, gettext("missing property "
1644                     "argument\n"));
1645                 usage(B_FALSE);
1646         }
1647 
1648         fields = argv[0];
1649 
1650         if (zprop_get_list(g_zfs, fields, &cb.cb_proplist, ZFS_TYPE_DATASET)
1651             != 0)
1652                 usage(B_FALSE);
1653 
1654         argc--;
1655         argv++;
1656 
1657         /*
1658          * As part of zfs_expand_proplist(), we keep track of the maximum column
1659          * width for each property.  For the 'NAME' (and 'SOURCE') columns, we
1660          * need to know the maximum name length.  However, the user likely did
1661          * not specify 'name' as one of the properties to fetch, so we need to
1662          * make sure we always include at least this property for
1663          * print_get_headers() to work properly.
1664          */
1665         if (cb.cb_proplist != NULL) {
1666                 fake_name.pl_prop = ZFS_PROP_NAME;
1667                 fake_name.pl_width = strlen(gettext("NAME"));
1668                 fake_name.pl_next = cb.cb_proplist;
1669                 cb.cb_proplist = &fake_name;
1670         }
1671 
1672         cb.cb_first = B_TRUE;
1673 
1674         /* run for each object */
1675         ret = zfs_for_each(argc, argv, flags, types, NULL,
1676             &cb.cb_proplist, limit, get_callback, &cb);
1677 
1678         if (cb.cb_proplist == &fake_name)
1679                 zprop_free_list(fake_name.pl_next);
1680         else
1681                 zprop_free_list(cb.cb_proplist);
1682 
1683         return (ret);
1684 }
1685 
1686 /*
1687  * inherit [-rS] <property> <fs|vol> ...
1688  *
1689  *      -r      Recurse over all children
1690  *      -S      Revert to received value, if any
1691  *
1692  * For each dataset specified on the command line, inherit the given property
1693  * from its parent.  Inheriting a property at the pool level will cause it to
1694  * use the default value.  The '-r' flag will recurse over all children, and is
1695  * useful for setting a property on a hierarchy-wide basis, regardless of any
1696  * local modifications for each dataset.
1697  */
1698 
1699 typedef struct inherit_cbdata {
1700         const char *cb_propname;
1701         boolean_t cb_received;
1702 } inherit_cbdata_t;
1703 
1704 static int
1705 inherit_recurse_cb(zfs_handle_t *zhp, void *data)
1706 {
1707         inherit_cbdata_t *cb = data;
1708         zfs_prop_t prop = zfs_name_to_prop(cb->cb_propname);
1709 
1710         /*
1711          * If we're doing it recursively, then ignore properties that
1712          * are not valid for this type of dataset.
1713          */
1714         if (prop != ZPROP_INVAL &&
1715             !zfs_prop_valid_for_type(prop, zfs_get_type(zhp)))
1716                 return (0);
1717 
1718         return (zfs_prop_inherit(zhp, cb->cb_propname, cb->cb_received) != 0);
1719 }
1720 
1721 static int
1722 inherit_cb(zfs_handle_t *zhp, void *data)
1723 {
1724         inherit_cbdata_t *cb = data;
1725 
1726         return (zfs_prop_inherit(zhp, cb->cb_propname, cb->cb_received) != 0);
1727 }
1728 
1729 static int
1730 zfs_do_inherit(int argc, char **argv)
1731 {
1732         int c;
1733         zfs_prop_t prop;
1734         inherit_cbdata_t cb = { 0 };
1735         char *propname;
1736         int ret = 0;
1737         int flags = 0;
1738         boolean_t received = B_FALSE;
1739 
1740         /* check options */
1741         while ((c = getopt(argc, argv, "rS")) != -1) {
1742                 switch (c) {
1743                 case 'r':
1744                         flags |= ZFS_ITER_RECURSE;
1745                         break;
1746                 case 'S':
1747                         received = B_TRUE;
1748                         break;
1749                 case '?':
1750                 default:
1751                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
1752                             optopt);
1753                         usage(B_FALSE);
1754                 }
1755         }
1756 
1757         argc -= optind;
1758         argv += optind;
1759 
1760         /* check number of arguments */
1761         if (argc < 1) {
1762                 (void) fprintf(stderr, gettext("missing property argument\n"));
1763                 usage(B_FALSE);
1764         }
1765         if (argc < 2) {
1766                 (void) fprintf(stderr, gettext("missing dataset argument\n"));
1767                 usage(B_FALSE);
1768         }
1769 
1770         propname = argv[0];
1771         argc--;
1772         argv++;
1773 
1774         if ((prop = zfs_name_to_prop(propname)) != ZPROP_INVAL) {
1775                 if (zfs_prop_readonly(prop)) {
1776                         (void) fprintf(stderr, gettext(
1777                             "%s property is read-only\n"),
1778                             propname);
1779                         return (1);
1780                 }
1781                 if (!zfs_prop_inheritable(prop) && !received) {
1782                         (void) fprintf(stderr, gettext("'%s' property cannot "
1783                             "be inherited\n"), propname);
1784                         if (prop == ZFS_PROP_QUOTA ||
1785                             prop == ZFS_PROP_RESERVATION ||
1786                             prop == ZFS_PROP_REFQUOTA ||
1787                             prop == ZFS_PROP_REFRESERVATION)
1788                                 (void) fprintf(stderr, gettext("use 'zfs set "
1789                                     "%s=none' to clear\n"), propname);
1790                         return (1);
1791                 }
1792                 if (received && (prop == ZFS_PROP_VOLSIZE ||
1793                     prop == ZFS_PROP_VERSION)) {
1794                         (void) fprintf(stderr, gettext("'%s' property cannot "
1795                             "be reverted to a received value\n"), propname);
1796                         return (1);
1797                 }
1798         } else if (!zfs_prop_user(propname)) {
1799                 (void) fprintf(stderr, gettext("invalid property '%s'\n"),
1800                     propname);
1801                 usage(B_FALSE);
1802         }
1803 
1804         cb.cb_propname = propname;
1805         cb.cb_received = received;
1806 
1807         if (flags & ZFS_ITER_RECURSE) {
1808                 ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
1809                     NULL, NULL, 0, inherit_recurse_cb, &cb);
1810         } else {
1811                 ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_DATASET,
1812                     NULL, NULL, 0, inherit_cb, &cb);
1813         }
1814 
1815         return (ret);
1816 }
1817 
1818 typedef struct upgrade_cbdata {
1819         uint64_t cb_numupgraded;
1820         uint64_t cb_numsamegraded;
1821         uint64_t cb_numfailed;
1822         uint64_t cb_version;
1823         boolean_t cb_newer;
1824         boolean_t cb_foundone;
1825         char cb_lastfs[ZFS_MAXNAMELEN];
1826 } upgrade_cbdata_t;
1827 
1828 static int
1829 same_pool(zfs_handle_t *zhp, const char *name)
1830 {
1831         int len1 = strcspn(name, "/@");
1832         const char *zhname = zfs_get_name(zhp);
1833         int len2 = strcspn(zhname, "/@");
1834 
1835         if (len1 != len2)
1836                 return (B_FALSE);
1837         return (strncmp(name, zhname, len1) == 0);
1838 }
1839 
1840 static int
1841 upgrade_list_callback(zfs_handle_t *zhp, void *data)
1842 {
1843         upgrade_cbdata_t *cb = data;
1844         int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
1845 
1846         /* list if it's old/new */
1847         if ((!cb->cb_newer && version < ZPL_VERSION) ||
1848             (cb->cb_newer && version > ZPL_VERSION)) {
1849                 char *str;
1850                 if (cb->cb_newer) {
1851                         str = gettext("The following filesystems are "
1852                             "formatted using a newer software version and\n"
1853                             "cannot be accessed on the current system.\n\n");
1854                 } else {
1855                         str = gettext("The following filesystems are "
1856                             "out of date, and can be upgraded.  After being\n"
1857                             "upgraded, these filesystems (and any 'zfs send' "
1858                             "streams generated from\n"
1859                             "subsequent snapshots) will no longer be "
1860                             "accessible by older software versions.\n\n");
1861                 }
1862 
1863                 if (!cb->cb_foundone) {
1864                         (void) puts(str);
1865                         (void) printf(gettext("VER  FILESYSTEM\n"));
1866                         (void) printf(gettext("---  ------------\n"));
1867                         cb->cb_foundone = B_TRUE;
1868                 }
1869 
1870                 (void) printf("%2u   %s\n", version, zfs_get_name(zhp));
1871         }
1872 
1873         return (0);
1874 }
1875 
1876 static int
1877 upgrade_set_callback(zfs_handle_t *zhp, void *data)
1878 {
1879         upgrade_cbdata_t *cb = data;
1880         int version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
1881         int needed_spa_version;
1882         int spa_version;
1883 
1884         if (zfs_spa_version(zhp, &spa_version) < 0)
1885                 return (-1);
1886 
1887         needed_spa_version = zfs_spa_version_map(cb->cb_version);
1888 
1889         if (needed_spa_version < 0)
1890                 return (-1);
1891 
1892         if (spa_version < needed_spa_version) {
1893                 /* can't upgrade */
1894                 (void) printf(gettext("%s: can not be "
1895                     "upgraded; the pool version needs to first "
1896                     "be upgraded\nto version %d\n\n"),
1897                     zfs_get_name(zhp), needed_spa_version);
1898                 cb->cb_numfailed++;
1899                 return (0);
1900         }
1901 
1902         /* upgrade */
1903         if (version < cb->cb_version) {
1904                 char verstr[16];
1905                 (void) snprintf(verstr, sizeof (verstr),
1906                     "%llu", cb->cb_version);
1907                 if (cb->cb_lastfs[0] && !same_pool(zhp, cb->cb_lastfs)) {
1908                         /*
1909                          * If they did "zfs upgrade -a", then we could
1910                          * be doing ioctls to different pools.  We need
1911                          * to log this history once to each pool, and bypass
1912                          * the normal history logging that happens in main().
1913                          */
1914                         (void) zpool_log_history(g_zfs, history_str);
1915                         log_history = B_FALSE;
1916                 }
1917                 if (zfs_prop_set(zhp, "version", verstr) == 0)
1918                         cb->cb_numupgraded++;
1919                 else
1920                         cb->cb_numfailed++;
1921                 (void) strcpy(cb->cb_lastfs, zfs_get_name(zhp));
1922         } else if (version > cb->cb_version) {
1923                 /* can't downgrade */
1924                 (void) printf(gettext("%s: can not be downgraded; "
1925                     "it is already at version %u\n"),
1926                     zfs_get_name(zhp), version);
1927                 cb->cb_numfailed++;
1928         } else {
1929                 cb->cb_numsamegraded++;
1930         }
1931         return (0);
1932 }
1933 
1934 /*
1935  * zfs upgrade
1936  * zfs upgrade -v
1937  * zfs upgrade [-r] [-V <version>] <-a | filesystem>
1938  */
1939 static int
1940 zfs_do_upgrade(int argc, char **argv)
1941 {
1942         boolean_t all = B_FALSE;
1943         boolean_t showversions = B_FALSE;
1944         int ret = 0;
1945         upgrade_cbdata_t cb = { 0 };
1946         char c;
1947         int flags = ZFS_ITER_ARGS_CAN_BE_PATHS;
1948 
1949         /* check options */
1950         while ((c = getopt(argc, argv, "rvV:a")) != -1) {
1951                 switch (c) {
1952                 case 'r':
1953                         flags |= ZFS_ITER_RECURSE;
1954                         break;
1955                 case 'v':
1956                         showversions = B_TRUE;
1957                         break;
1958                 case 'V':
1959                         if (zfs_prop_string_to_index(ZFS_PROP_VERSION,
1960                             optarg, &cb.cb_version) != 0) {
1961                                 (void) fprintf(stderr,
1962                                     gettext("invalid version %s\n"), optarg);
1963                                 usage(B_FALSE);
1964                         }
1965                         break;
1966                 case 'a':
1967                         all = B_TRUE;
1968                         break;
1969                 case '?':
1970                 default:
1971                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
1972                             optopt);
1973                         usage(B_FALSE);
1974                 }
1975         }
1976 
1977         argc -= optind;
1978         argv += optind;
1979 
1980         if ((!all && !argc) && ((flags & ZFS_ITER_RECURSE) | cb.cb_version))
1981                 usage(B_FALSE);
1982         if (showversions && (flags & ZFS_ITER_RECURSE || all ||
1983             cb.cb_version || argc))
1984                 usage(B_FALSE);
1985         if ((all || argc) && (showversions))
1986                 usage(B_FALSE);
1987         if (all && argc)
1988                 usage(B_FALSE);
1989 
1990         if (showversions) {
1991                 /* Show info on available versions. */
1992                 (void) printf(gettext("The following filesystem versions are "
1993                     "supported:\n\n"));
1994                 (void) printf(gettext("VER  DESCRIPTION\n"));
1995                 (void) printf("---  -----------------------------------------"
1996                     "---------------\n");
1997                 (void) printf(gettext(" 1   Initial ZFS filesystem version\n"));
1998                 (void) printf(gettext(" 2   Enhanced directory entries\n"));
1999                 (void) printf(gettext(" 3   Case insensitive and filesystem "
2000                     "user identifier (FUID)\n"));
2001                 (void) printf(gettext(" 4   userquota, groupquota "
2002                     "properties\n"));
2003                 (void) printf(gettext(" 5   System attributes\n"));
2004                 (void) printf(gettext("\nFor more information on a particular "
2005                     "version, including supported releases,\n"));
2006                 (void) printf("see the ZFS Administration Guide.\n\n");
2007                 ret = 0;
2008         } else if (argc || all) {
2009                 /* Upgrade filesystems */
2010                 if (cb.cb_version == 0)
2011                         cb.cb_version = ZPL_VERSION;
2012                 ret = zfs_for_each(argc, argv, flags, ZFS_TYPE_FILESYSTEM,
2013                     NULL, NULL, 0, upgrade_set_callback, &cb);
2014                 (void) printf(gettext("%llu filesystems upgraded\n"),
2015                     cb.cb_numupgraded);
2016                 if (cb.cb_numsamegraded) {
2017                         (void) printf(gettext("%llu filesystems already at "
2018                             "this version\n"),
2019                             cb.cb_numsamegraded);
2020                 }
2021                 if (cb.cb_numfailed != 0)
2022                         ret = 1;
2023         } else {
2024                 /* List old-version filesytems */
2025                 boolean_t found;
2026                 (void) printf(gettext("This system is currently running "
2027                     "ZFS filesystem version %llu.\n\n"), ZPL_VERSION);
2028 
2029                 flags |= ZFS_ITER_RECURSE;
2030                 ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
2031                     NULL, NULL, 0, upgrade_list_callback, &cb);
2032 
2033                 found = cb.cb_foundone;
2034                 cb.cb_foundone = B_FALSE;
2035                 cb.cb_newer = B_TRUE;
2036 
2037                 ret = zfs_for_each(0, NULL, flags, ZFS_TYPE_FILESYSTEM,
2038                     NULL, NULL, 0, upgrade_list_callback, &cb);
2039 
2040                 if (!cb.cb_foundone && !found) {
2041                         (void) printf(gettext("All filesystems are "
2042                             "formatted with the current version.\n"));
2043                 }
2044         }
2045 
2046         return (ret);
2047 }
2048 
2049 /*
2050  * zfs userspace [-Hinp] [-o field[,...]] [-s field [-s field]...]
2051  *               [-S field [-S field]...] [-t type[,...]] filesystem | snapshot
2052  * zfs groupspace [-Hinp] [-o field[,...]] [-s field [-s field]...]
2053  *                [-S field [-S field]...] [-t type[,...]] filesystem | snapshot
2054  *
2055  *      -H      Scripted mode; elide headers and separate columns by tabs.
2056  *      -i      Translate SID to POSIX ID.
2057  *      -n      Print numeric ID instead of user/group name.
2058  *      -o      Control which fields to display.
2059  *      -p      Use exact (parseable) numeric output.
2060  *      -s      Specify sort columns, descending order.
2061  *      -S      Specify sort columns, ascending order.
2062  *      -t      Control which object types to display.
2063  *
2064  *      Displays space consumed by, and quotas on, each user in the specified
2065  *      filesystem or snapshot.
2066  */
2067 
2068 /* us_field_types, us_field_hdr and us_field_names should be kept in sync */
2069 enum us_field_types {
2070         USFIELD_TYPE,
2071         USFIELD_NAME,
2072         USFIELD_USED,
2073         USFIELD_QUOTA
2074 };
2075 static char *us_field_hdr[] = { "TYPE", "NAME", "USED", "QUOTA" };
2076 static char *us_field_names[] = { "type", "name", "used", "quota" };
2077 #define USFIELD_LAST    (sizeof (us_field_names) / sizeof (char *))
2078 
2079 #define USTYPE_PSX_GRP  (1 << 0)
2080 #define USTYPE_PSX_USR  (1 << 1)
2081 #define USTYPE_SMB_GRP  (1 << 2)
2082 #define USTYPE_SMB_USR  (1 << 3)
2083 #define USTYPE_ALL      \
2084         (USTYPE_PSX_GRP | USTYPE_PSX_USR | USTYPE_SMB_GRP | USTYPE_SMB_USR)
2085 
2086 static int us_type_bits[] = {
2087         USTYPE_PSX_GRP,
2088         USTYPE_PSX_USR,
2089         USTYPE_SMB_GRP,
2090         USTYPE_SMB_USR,
2091         USTYPE_ALL
2092 };
2093 static char *us_type_names[] = { "posixgroup", "posxiuser", "smbgroup",
2094         "smbuser", "all" };
2095 
2096 typedef struct us_node {
2097         nvlist_t        *usn_nvl;
2098         uu_avl_node_t   usn_avlnode;
2099         uu_list_node_t  usn_listnode;
2100 } us_node_t;
2101 
2102 typedef struct us_cbdata {
2103         nvlist_t        **cb_nvlp;
2104         uu_avl_pool_t   *cb_avl_pool;
2105         uu_avl_t        *cb_avl;
2106         boolean_t       cb_numname;
2107         boolean_t       cb_nicenum;
2108         boolean_t       cb_sid2posix;
2109         zfs_userquota_prop_t cb_prop;
2110         zfs_sort_column_t *cb_sortcol;
2111         size_t          cb_width[USFIELD_LAST];
2112 } us_cbdata_t;
2113 
2114 static boolean_t us_populated = B_FALSE;
2115 
2116 typedef struct {
2117         zfs_sort_column_t *si_sortcol;
2118         boolean_t       si_numname;
2119 } us_sort_info_t;
2120 
2121 static int
2122 us_field_index(char *field)
2123 {
2124         int i;
2125 
2126         for (i = 0; i < USFIELD_LAST; i++) {
2127                 if (strcmp(field, us_field_names[i]) == 0)
2128                         return (i);
2129         }
2130 
2131         return (-1);
2132 }
2133 
2134 static int
2135 us_compare(const void *larg, const void *rarg, void *unused)
2136 {
2137         const us_node_t *l = larg;
2138         const us_node_t *r = rarg;
2139         us_sort_info_t *si = (us_sort_info_t *)unused;
2140         zfs_sort_column_t *sortcol = si->si_sortcol;
2141         boolean_t numname = si->si_numname;
2142         nvlist_t *lnvl = l->usn_nvl;
2143         nvlist_t *rnvl = r->usn_nvl;
2144         int rc = 0;
2145         boolean_t lvb, rvb;
2146 
2147         for (; sortcol != NULL; sortcol = sortcol->sc_next) {
2148                 char *lvstr = "";
2149                 char *rvstr = "";
2150                 uint32_t lv32 = 0;
2151                 uint32_t rv32 = 0;
2152                 uint64_t lv64 = 0;
2153                 uint64_t rv64 = 0;
2154                 zfs_prop_t prop = sortcol->sc_prop;
2155                 const char *propname = NULL;
2156                 boolean_t reverse = sortcol->sc_reverse;
2157 
2158                 switch (prop) {
2159                 case ZFS_PROP_TYPE:
2160                         propname = "type";
2161                         (void) nvlist_lookup_uint32(lnvl, propname, &lv32);
2162                         (void) nvlist_lookup_uint32(rnvl, propname, &rv32);
2163                         if (rv32 != lv32)
2164                                 rc = (rv32 < lv32) ? 1 : -1;
2165                         break;
2166                 case ZFS_PROP_NAME:
2167                         propname = "name";
2168                         if (numname) {
2169                                 (void) nvlist_lookup_uint64(lnvl, propname,
2170                                     &lv64);
2171                                 (void) nvlist_lookup_uint64(rnvl, propname,
2172                                     &rv64);
2173                                 if (rv64 != lv64)
2174                                         rc = (rv64 < lv64) ? 1 : -1;
2175                         } else {
2176                                 (void) nvlist_lookup_string(lnvl, propname,
2177                                     &lvstr);
2178                                 (void) nvlist_lookup_string(rnvl, propname,
2179                                     &rvstr);
2180                                 rc = strcmp(lvstr, rvstr);
2181                         }
2182                         break;
2183                 case ZFS_PROP_USED:
2184                 case ZFS_PROP_QUOTA:
2185                         if (!us_populated)
2186                                 break;
2187                         if (prop == ZFS_PROP_USED)
2188                                 propname = "used";
2189                         else
2190                                 propname = "quota";
2191                         (void) nvlist_lookup_uint64(lnvl, propname, &lv64);
2192                         (void) nvlist_lookup_uint64(rnvl, propname, &rv64);
2193                         if (rv64 != lv64)
2194                                 rc = (rv64 < lv64) ? 1 : -1;
2195                         break;
2196                 }
2197 
2198                 if (rc != 0) {
2199                         if (rc < 0)
2200                                 return (reverse ? 1 : -1);
2201                         else
2202                                 return (reverse ? -1 : 1);
2203                 }
2204         }
2205 
2206         /*
2207          * If entries still seem to be the same, check if they are of the same
2208          * type (smbentity is added only if we are doing SID to POSIX ID
2209          * translation where we can have duplicate type/name combinations).
2210          */
2211         if (nvlist_lookup_boolean_value(lnvl, "smbentity", &lvb) == 0 &&
2212             nvlist_lookup_boolean_value(rnvl, "smbentity", &rvb) == 0 &&
2213             lvb != rvb)
2214                 return (lvb < rvb ? -1 : 1);
2215 
2216         return (0);
2217 }
2218 
2219 static inline const char *
2220 us_type2str(unsigned field_type)
2221 {
2222         switch (field_type) {
2223         case USTYPE_PSX_USR:
2224                 return ("POSIX User");
2225         case USTYPE_PSX_GRP:
2226                 return ("POSIX Group");
2227         case USTYPE_SMB_USR:
2228                 return ("SMB User");
2229         case USTYPE_SMB_GRP:
2230                 return ("SMB Group");
2231         default:
2232                 return ("Undefined");
2233         }
2234 }
2235 
2236 static int
2237 userspace_cb(void *arg, const char *domain, uid_t rid, uint64_t space)
2238 {
2239         us_cbdata_t *cb = (us_cbdata_t *)arg;
2240         zfs_userquota_prop_t prop = cb->cb_prop;
2241         char *name = NULL;
2242         char *propname;
2243         char sizebuf[32];
2244         us_node_t *node;
2245         uu_avl_pool_t *avl_pool = cb->cb_avl_pool;
2246         uu_avl_t *avl = cb->cb_avl;
2247         uu_avl_index_t idx;
2248         nvlist_t *props;
2249         us_node_t *n;
2250         zfs_sort_column_t *sortcol = cb->cb_sortcol;
2251         unsigned type;
2252         const char *typestr;
2253         size_t namelen;
2254         size_t typelen;
2255         size_t sizelen;
2256         int typeidx, nameidx, sizeidx;
2257         us_sort_info_t sortinfo = { sortcol, cb->cb_numname };
2258         boolean_t smbentity = B_FALSE;
2259 
2260         if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
2261                 nomem();
2262         node = safe_malloc(sizeof (us_node_t));
2263         uu_avl_node_init(node, &node->usn_avlnode, avl_pool);
2264         node->usn_nvl = props;
2265 
2266         if (domain != NULL && domain[0] != '\0') {
2267                 /* SMB */
2268                 char sid[ZFS_MAXNAMELEN + 32];
2269                 uid_t id;
2270                 uint64_t classes;
2271                 int err;
2272                 directory_error_t e;
2273 
2274                 smbentity = B_TRUE;
2275 
2276                 (void) snprintf(sid, sizeof (sid), "%s-%u", domain, rid);
2277 
2278                 if (prop == ZFS_PROP_GROUPUSED || prop == ZFS_PROP_GROUPQUOTA) {
2279                         type = USTYPE_SMB_GRP;
2280                         err = sid_to_id(sid, B_FALSE, &id);
2281                 } else {
2282                         type = USTYPE_SMB_USR;
2283                         err = sid_to_id(sid, B_TRUE, &id);
2284                 }
2285 
2286                 if (err == 0) {
2287                         rid = id;
2288                         if (!cb->cb_sid2posix) {
2289                                 e = directory_name_from_sid(NULL, sid, &name,
2290                                     &classes);
2291                                 if (e != NULL)
2292                                         directory_error_free(e);
2293                                 if (name == NULL)
2294                                         name = sid;
2295                         }
2296                 }
2297         }
2298 
2299         if (cb->cb_sid2posix || domain == NULL || domain[0] == '\0') {
2300                 /* POSIX or -i */
2301                 if (prop == ZFS_PROP_GROUPUSED || prop == ZFS_PROP_GROUPQUOTA) {
2302                         type = USTYPE_PSX_GRP;
2303                         if (!cb->cb_numname) {
2304                                 struct group *g;
2305 
2306                                 if ((g = getgrgid(rid)) != NULL)
2307                                         name = g->gr_name;
2308                         }
2309                 } else {
2310                         type = USTYPE_PSX_USR;
2311                         if (!cb->cb_numname) {
2312                                 struct passwd *p;
2313 
2314                                 if ((p = getpwuid(rid)) != NULL)
2315                                         name = p->pw_name;
2316                         }
2317                 }
2318         }
2319 
2320         /*
2321          * Make sure that the type/name combination is unique when doing
2322          * SID to POSIX ID translation (hence changing the type from SMB to
2323          * POSIX).
2324          */
2325         if (cb->cb_sid2posix &&
2326             nvlist_add_boolean_value(props, "smbentity", smbentity) != 0)
2327                 nomem();
2328 
2329         /* Calculate/update width of TYPE field */
2330         typestr = us_type2str(type);
2331         typelen = strlen(gettext(typestr));
2332         typeidx = us_field_index("type");
2333         if (typelen > cb->cb_width[typeidx])
2334                 cb->cb_width[typeidx] = typelen;
2335         if (nvlist_add_uint32(props, "type", type) != 0)
2336                 nomem();
2337 
2338         /* Calculate/update width of NAME field */
2339         if ((cb->cb_numname && cb->cb_sid2posix) || name == NULL) {
2340                 if (nvlist_add_uint64(props, "name", rid) != 0)
2341                         nomem();
2342                 namelen = snprintf(NULL, 0, "%u", rid);
2343         } else {
2344                 if (nvlist_add_string(props, "name", name) != 0)
2345                         nomem();
2346                 namelen = strlen(name);
2347         }
2348         nameidx = us_field_index("name");
2349         if (namelen > cb->cb_width[nameidx])
2350                 cb->cb_width[nameidx] = namelen;
2351 
2352         /*
2353          * Check if this type/name combination is in the list and update it;
2354          * otherwise add new node to the list.
2355          */
2356         if ((n = uu_avl_find(avl, node, &sortinfo, &idx)) == NULL) {
2357                 uu_avl_insert(avl, node, idx);
2358         } else {
2359                 nvlist_free(props);
2360                 free(node);
2361                 node = n;
2362                 props = node->usn_nvl;
2363         }
2364 
2365         /* Calculate/update width of USED/QUOTA fields */
2366         if (cb->cb_nicenum)
2367                 zfs_nicenum(space, sizebuf, sizeof (sizebuf));
2368         else
2369                 (void) snprintf(sizebuf, sizeof (sizebuf), "%llu", space);
2370         sizelen = strlen(sizebuf);
2371         if (prop == ZFS_PROP_USERUSED || prop == ZFS_PROP_GROUPUSED) {
2372                 propname = "used";
2373                 if (!nvlist_exists(props, "quota"))
2374                         (void) nvlist_add_uint64(props, "quota", 0);
2375         } else {
2376                 propname = "quota";
2377                 if (!nvlist_exists(props, "used"))
2378                         (void) nvlist_add_uint64(props, "used", 0);
2379         }
2380         sizeidx = us_field_index(propname);
2381         if (sizelen > cb->cb_width[sizeidx])
2382                 cb->cb_width[sizeidx] = sizelen;
2383 
2384         if (nvlist_add_uint64(props, propname, space) != 0)
2385                 nomem();
2386 
2387         return (0);
2388 }
2389 
2390 static void
2391 print_us_node(boolean_t scripted, boolean_t parsable, int *fields, int types,
2392     size_t *width, us_node_t *node)
2393 {
2394         nvlist_t *nvl = node->usn_nvl;
2395         char valstr[ZFS_MAXNAMELEN];
2396         boolean_t first = B_TRUE;
2397         int cfield = 0;
2398         int field;
2399         uint32_t ustype;
2400 
2401         /* Check type */
2402         (void) nvlist_lookup_uint32(nvl, "type", &ustype);
2403         if (!(ustype & types))
2404                 return;
2405 
2406         while ((field = fields[cfield]) != USFIELD_LAST) {
2407                 nvpair_t *nvp = NULL;
2408                 data_type_t type;
2409                 uint32_t val32;
2410                 uint64_t val64;
2411                 char *strval = NULL;
2412 
2413                 while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
2414                         if (strcmp(nvpair_name(nvp),
2415                             us_field_names[field]) == 0)
2416                                 break;
2417                 }
2418 
2419                 type = nvpair_type(nvp);
2420                 switch (type) {
2421                 case DATA_TYPE_UINT32:
2422                         (void) nvpair_value_uint32(nvp, &val32);
2423                         break;
2424                 case DATA_TYPE_UINT64:
2425                         (void) nvpair_value_uint64(nvp, &val64);
2426                         break;
2427                 case DATA_TYPE_STRING:
2428                         (void) nvpair_value_string(nvp, &strval);
2429                         break;
2430                 default:
2431                         (void) fprintf(stderr, "invalid data type\n");
2432                 }
2433 
2434                 switch (field) {
2435                 case USFIELD_TYPE:
2436                         strval = (char *)us_type2str(val32);
2437                         break;
2438                 case USFIELD_NAME:
2439                         if (type == DATA_TYPE_UINT64) {
2440                                 (void) sprintf(valstr, "%llu", val64);
2441                                 strval = valstr;
2442                         }
2443                         break;
2444                 case USFIELD_USED:
2445                 case USFIELD_QUOTA:
2446                         if (type == DATA_TYPE_UINT64) {
2447                                 if (parsable) {
2448                                         (void) sprintf(valstr, "%llu", val64);
2449                                 } else {
2450                                         zfs_nicenum(val64, valstr,
2451                                             sizeof (valstr));
2452                                 }
2453                                 if (field == USFIELD_QUOTA &&
2454                                     strcmp(valstr, "0") == 0)
2455                                         strval = "none";
2456                                 else
2457                                         strval = valstr;
2458                         }
2459                         break;
2460                 }
2461 
2462                 if (!first) {
2463                         if (scripted)
2464                                 (void) printf("\t");
2465                         else
2466                                 (void) printf("  ");
2467                 }
2468                 if (scripted)
2469                         (void) printf("%s", strval);
2470                 else if (field == USFIELD_TYPE || field == USFIELD_NAME)
2471                         (void) printf("%-*s", width[field], strval);
2472                 else
2473                         (void) printf("%*s", width[field], strval);
2474 
2475                 first = B_FALSE;
2476                 cfield++;
2477         }
2478 
2479         (void) printf("\n");
2480 }
2481 
2482 static void
2483 print_us(boolean_t scripted, boolean_t parsable, int *fields, int types,
2484     size_t *width, boolean_t rmnode, uu_avl_t *avl)
2485 {
2486         us_node_t *node;
2487         const char *col;
2488         int cfield = 0;
2489         int field;
2490 
2491         if (!scripted) {
2492                 boolean_t first = B_TRUE;
2493 
2494                 while ((field = fields[cfield]) != USFIELD_LAST) {
2495                         col = gettext(us_field_hdr[field]);
2496                         if (field == USFIELD_TYPE || field == USFIELD_NAME) {
2497                                 (void) printf(first ? "%-*s" : "  %-*s",
2498                                     width[field], col);
2499                         } else {
2500                                 (void) printf(first ? "%*s" : "  %*s",
2501                                     width[field], col);
2502                         }
2503                         first = B_FALSE;
2504                         cfield++;
2505                 }
2506                 (void) printf("\n");
2507         }
2508 
2509         for (node = uu_avl_first(avl); node; node = uu_avl_next(avl, node)) {
2510                 print_us_node(scripted, parsable, fields, types, width, node);
2511                 if (rmnode)
2512                         nvlist_free(node->usn_nvl);
2513         }
2514 }
2515 
2516 static int
2517 zfs_do_userspace(int argc, char **argv)
2518 {
2519         zfs_handle_t *zhp;
2520         zfs_userquota_prop_t p;
2521         uu_avl_pool_t *avl_pool;
2522         uu_avl_t *avl_tree;
2523         uu_avl_walk_t *walk;
2524         char *delim;
2525         char deffields[] = "type,name,used,quota";
2526         char *ofield = NULL;
2527         char *tfield = NULL;
2528         int cfield = 0;
2529         int fields[256];
2530         int i;
2531         boolean_t scripted = B_FALSE;
2532         boolean_t prtnum = B_FALSE;
2533         boolean_t parsable = B_FALSE;
2534         boolean_t sid2posix = B_FALSE;
2535         int ret = 0;
2536         int c;
2537         zfs_sort_column_t *sortcol = NULL;
2538         int types = USTYPE_PSX_USR | USTYPE_SMB_USR;
2539         us_cbdata_t cb;
2540         us_node_t *node;
2541         us_node_t *rmnode;
2542         uu_list_pool_t *listpool;
2543         uu_list_t *list;
2544         uu_avl_index_t idx = 0;
2545         uu_list_index_t idx2 = 0;
2546 
2547         if (argc < 2)
2548                 usage(B_FALSE);
2549 
2550         if (strcmp(argv[0], "groupspace") == 0)
2551                 /* Toggle default group types */
2552                 types = USTYPE_PSX_GRP | USTYPE_SMB_GRP;
2553 
2554         while ((c = getopt(argc, argv, "nHpo:s:S:t:i")) != -1) {
2555                 switch (c) {
2556                 case 'n':
2557                         prtnum = B_TRUE;
2558                         break;
2559                 case 'H':
2560                         scripted = B_TRUE;
2561                         break;
2562                 case 'p':
2563                         parsable = B_TRUE;
2564                         break;
2565                 case 'o':
2566                         ofield = optarg;
2567                         break;
2568                 case 's':
2569                 case 'S':
2570                         if (zfs_add_sort_column(&sortcol, optarg,
2571                             c == 's' ? B_FALSE : B_TRUE) != 0) {
2572                                 (void) fprintf(stderr,
2573                                     gettext("invalid field '%s'\n"), optarg);
2574                                 usage(B_FALSE);
2575                         }
2576                         break;
2577                 case 't':
2578                         tfield = optarg;
2579                         break;
2580                 case 'i':
2581                         sid2posix = B_TRUE;
2582                         break;
2583                 case ':':
2584                         (void) fprintf(stderr, gettext("missing argument for "
2585                             "'%c' option\n"), optopt);
2586                         usage(B_FALSE);
2587                         break;
2588                 case '?':
2589                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
2590                             optopt);
2591                         usage(B_FALSE);
2592                 }
2593         }
2594 
2595         argc -= optind;
2596         argv += optind;
2597 
2598         if (argc < 1) {
2599                 (void) fprintf(stderr, gettext("missing dataset name\n"));
2600                 usage(B_FALSE);
2601         }
2602         if (argc > 1) {
2603                 (void) fprintf(stderr, gettext("too many arguments\n"));
2604                 usage(B_FALSE);
2605         }
2606 
2607         /* Use default output fields if not specified using -o */
2608         if (ofield == NULL)
2609                 ofield = deffields;
2610         do {
2611                 if ((delim = strchr(ofield, ',')) != NULL)
2612                         *delim = '\0';
2613                 if ((fields[cfield++] = us_field_index(ofield)) == -1) {
2614                         (void) fprintf(stderr, gettext("invalid type '%s' "
2615                             "for -o option\n"), ofield);
2616                         return (-1);
2617                 }
2618                 if (delim != NULL)
2619                         ofield = delim + 1;
2620         } while (delim != NULL);
2621         fields[cfield] = USFIELD_LAST;
2622 
2623         /* Override output types (-t option) */
2624         if (tfield != NULL) {
2625                 types = 0;
2626 
2627                 do {
2628                         boolean_t found = B_FALSE;
2629 
2630                         if ((delim = strchr(tfield, ',')) != NULL)
2631                                 *delim = '\0';
2632                         for (i = 0; i < sizeof (us_type_bits) / sizeof (int);
2633                             i++) {
2634                                 if (strcmp(tfield, us_type_names[i]) == 0) {
2635                                         found = B_TRUE;
2636                                         types |= us_type_bits[i];
2637                                         break;
2638                                 }
2639                         }
2640                         if (!found) {
2641                                 (void) fprintf(stderr, gettext("invalid type "
2642                                     "'%s' for -t option\n"), tfield);
2643                                 return (-1);
2644                         }
2645                         if (delim != NULL)
2646                                 tfield = delim + 1;
2647                 } while (delim != NULL);
2648         }
2649 
2650         if ((zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET)) == NULL)
2651                 return (1);
2652 
2653         if ((avl_pool = uu_avl_pool_create("us_avl_pool", sizeof (us_node_t),
2654             offsetof(us_node_t, usn_avlnode), us_compare, UU_DEFAULT)) == NULL)
2655                 nomem();
2656         if ((avl_tree = uu_avl_create(avl_pool, NULL, UU_DEFAULT)) == NULL)
2657                 nomem();
2658 
2659         /* Always add default sorting columns */
2660         (void) zfs_add_sort_column(&sortcol, "type", B_FALSE);
2661         (void) zfs_add_sort_column(&sortcol, "name", B_FALSE);
2662 
2663         cb.cb_sortcol = sortcol;
2664         cb.cb_numname = prtnum;
2665         cb.cb_nicenum = !parsable;
2666         cb.cb_avl_pool = avl_pool;
2667         cb.cb_avl = avl_tree;
2668         cb.cb_sid2posix = sid2posix;
2669 
2670         for (i = 0; i < USFIELD_LAST; i++)
2671                 cb.cb_width[i] = strlen(gettext(us_field_hdr[i]));
2672 
2673         for (p = 0; p < ZFS_NUM_USERQUOTA_PROPS; p++) {
2674                 if (((p == ZFS_PROP_USERUSED || p == ZFS_PROP_USERQUOTA) &&
2675                     !(types & (USTYPE_PSX_USR | USTYPE_SMB_USR))) ||
2676                     ((p == ZFS_PROP_GROUPUSED || p == ZFS_PROP_GROUPQUOTA) &&
2677                     !(types & (USTYPE_PSX_GRP | USTYPE_SMB_GRP))))
2678                         continue;
2679                 cb.cb_prop = p;
2680                 if ((ret = zfs_userspace(zhp, p, userspace_cb, &cb)) != 0)
2681                         return (ret);
2682         }
2683 
2684         /* Sort the list */
2685         if ((node = uu_avl_first(avl_tree)) == NULL)
2686                 return (0);
2687 
2688         us_populated = B_TRUE;
2689 
2690         listpool = uu_list_pool_create("tmplist", sizeof (us_node_t),
2691             offsetof(us_node_t, usn_listnode), NULL, UU_DEFAULT);
2692         list = uu_list_create(listpool, NULL, UU_DEFAULT);
2693         uu_list_node_init(node, &node->usn_listnode, listpool);
2694 
2695         while (node != NULL) {
2696                 rmnode = node;
2697                 node = uu_avl_next(avl_tree, node);
2698                 uu_avl_remove(avl_tree, rmnode);
2699                 if (uu_list_find(list, rmnode, NULL, &idx2) == NULL)
2700                         uu_list_insert(list, rmnode, idx2);
2701         }
2702 
2703         for (node = uu_list_first(list); node != NULL;
2704             node = uu_list_next(list, node)) {
2705                 us_sort_info_t sortinfo = { sortcol, cb.cb_numname };
2706 
2707                 if (uu_avl_find(avl_tree, node, &sortinfo, &idx) == NULL)
2708                         uu_avl_insert(avl_tree, node, idx);
2709         }
2710 
2711         uu_list_destroy(list);
2712         uu_list_pool_destroy(listpool);
2713 
2714         /* Print and free node nvlist memory */
2715         print_us(scripted, parsable, fields, types, cb.cb_width, B_TRUE,
2716             cb.cb_avl);
2717 
2718         zfs_free_sort_columns(sortcol);
2719 
2720         /* Clean up the AVL tree */
2721         if ((walk = uu_avl_walk_start(cb.cb_avl, UU_WALK_ROBUST)) == NULL)
2722                 nomem();
2723 
2724         while ((node = uu_avl_walk_next(walk)) != NULL) {
2725                 uu_avl_remove(cb.cb_avl, node);
2726                 free(node);
2727         }
2728 
2729         uu_avl_walk_end(walk);
2730         uu_avl_destroy(avl_tree);
2731         uu_avl_pool_destroy(avl_pool);
2732 
2733         return (ret);
2734 }
2735 
2736 /*
2737  * list [-r][-d max] [-H] [-o property[,property]...] [-t type[,type]...]
2738  *      [-s property [-s property]...] [-S property [-S property]...]
2739  *      <dataset> ...
2740  *
2741  *      -r      Recurse over all children
2742  *      -d      Limit recursion by depth.
2743  *      -H      Scripted mode; elide headers and separate columns by tabs
2744  *      -o      Control which fields to display.
2745  *      -t      Control which object types to display.
2746  *      -s      Specify sort columns, descending order.
2747  *      -S      Specify sort columns, ascending order.
2748  *
2749  * When given no arguments, lists all filesystems in the system.
2750  * Otherwise, list the specified datasets, optionally recursing down them if
2751  * '-r' is specified.
2752  */
2753 typedef struct list_cbdata {
2754         boolean_t       cb_first;
2755         boolean_t       cb_scripted;
2756         zprop_list_t    *cb_proplist;
2757 } list_cbdata_t;
2758 
2759 /*
2760  * Given a list of columns to display, output appropriate headers for each one.
2761  */
2762 static void
2763 print_header(zprop_list_t *pl)
2764 {
2765         char headerbuf[ZFS_MAXPROPLEN];
2766         const char *header;
2767         int i;
2768         boolean_t first = B_TRUE;
2769         boolean_t right_justify;
2770 
2771         for (; pl != NULL; pl = pl->pl_next) {
2772                 if (!first) {
2773                         (void) printf("  ");
2774                 } else {
2775                         first = B_FALSE;
2776                 }
2777 
2778                 right_justify = B_FALSE;
2779                 if (pl->pl_prop != ZPROP_INVAL) {
2780                         header = zfs_prop_column_name(pl->pl_prop);
2781                         right_justify = zfs_prop_align_right(pl->pl_prop);
2782                 } else {
2783                         for (i = 0; pl->pl_user_prop[i] != '\0'; i++)
2784                                 headerbuf[i] = toupper(pl->pl_user_prop[i]);
2785                         headerbuf[i] = '\0';
2786                         header = headerbuf;
2787                 }
2788 
2789                 if (pl->pl_next == NULL && !right_justify)
2790                         (void) printf("%s", header);
2791                 else if (right_justify)
2792                         (void) printf("%*s", pl->pl_width, header);
2793                 else
2794                         (void) printf("%-*s", pl->pl_width, header);
2795         }
2796 
2797         (void) printf("\n");
2798 }
2799 
2800 /*
2801  * Given a dataset and a list of fields, print out all the properties according
2802  * to the described layout.
2803  */
2804 static void
2805 print_dataset(zfs_handle_t *zhp, zprop_list_t *pl, boolean_t scripted)
2806 {
2807         boolean_t first = B_TRUE;
2808         char property[ZFS_MAXPROPLEN];
2809         nvlist_t *userprops = zfs_get_user_props(zhp);
2810         nvlist_t *propval;
2811         char *propstr;
2812         boolean_t right_justify;
2813         int width;
2814 
2815         for (; pl != NULL; pl = pl->pl_next) {
2816                 if (!first) {
2817                         if (scripted)
2818                                 (void) printf("\t");
2819                         else
2820                                 (void) printf("  ");
2821                 } else {
2822                         first = B_FALSE;
2823                 }
2824 
2825                 if (pl->pl_prop != ZPROP_INVAL) {
2826                         if (zfs_prop_get(zhp, pl->pl_prop, property,
2827                             sizeof (property), NULL, NULL, 0, B_FALSE) != 0)
2828                                 propstr = "-";
2829                         else
2830                                 propstr = property;
2831 
2832                         right_justify = zfs_prop_align_right(pl->pl_prop);
2833                 } else if (zfs_prop_userquota(pl->pl_user_prop)) {
2834                         if (zfs_prop_get_userquota(zhp, pl->pl_user_prop,
2835                             property, sizeof (property), B_FALSE) != 0)
2836                                 propstr = "-";
2837                         else
2838                                 propstr = property;
2839                         right_justify = B_TRUE;
2840                 } else if (zfs_prop_written(pl->pl_user_prop)) {
2841                         if (zfs_prop_get_written(zhp, pl->pl_user_prop,
2842                             property, sizeof (property), B_FALSE) != 0)
2843                                 propstr = "-";
2844                         else
2845                                 propstr = property;
2846                         right_justify = B_TRUE;
2847                 } else {
2848                         if (nvlist_lookup_nvlist(userprops,
2849                             pl->pl_user_prop, &propval) != 0)
2850                                 propstr = "-";
2851                         else
2852                                 verify(nvlist_lookup_string(propval,
2853                                     ZPROP_VALUE, &propstr) == 0);
2854                         right_justify = B_FALSE;
2855                 }
2856 
2857                 width = pl->pl_width;
2858 
2859                 /*
2860                  * If this is being called in scripted mode, or if this is the
2861                  * last column and it is left-justified, don't include a width
2862                  * format specifier.
2863                  */
2864                 if (scripted || (pl->pl_next == NULL && !right_justify))
2865                         (void) printf("%s", propstr);
2866                 else if (right_justify)
2867                         (void) printf("%*s", width, propstr);
2868                 else
2869                         (void) printf("%-*s", width, propstr);
2870         }
2871 
2872         (void) printf("\n");
2873 }
2874 
2875 /*
2876  * Generic callback function to list a dataset or snapshot.
2877  */
2878 static int
2879 list_callback(zfs_handle_t *zhp, void *data)
2880 {
2881         list_cbdata_t *cbp = data;
2882 
2883         if (cbp->cb_first) {
2884                 if (!cbp->cb_scripted)
2885                         print_header(cbp->cb_proplist);
2886                 cbp->cb_first = B_FALSE;
2887         }
2888 
2889         print_dataset(zhp, cbp->cb_proplist, cbp->cb_scripted);
2890 
2891         return (0);
2892 }
2893 
2894 static int
2895 zfs_do_list(int argc, char **argv)
2896 {
2897         int c;
2898         boolean_t scripted = B_FALSE;
2899         static char default_fields[] =
2900             "name,used,available,referenced,mountpoint";
2901         int types = ZFS_TYPE_DATASET;
2902         boolean_t types_specified = B_FALSE;
2903         char *fields = NULL;
2904         list_cbdata_t cb = { 0 };
2905         char *value;
2906         int limit = 0;
2907         int ret = 0;
2908         zfs_sort_column_t *sortcol = NULL;
2909         int flags = ZFS_ITER_PROP_LISTSNAPS | ZFS_ITER_ARGS_CAN_BE_PATHS;
2910 
2911         /* check options */
2912         while ((c = getopt(argc, argv, ":d:o:rt:Hs:S:")) != -1) {
2913                 switch (c) {
2914                 case 'o':
2915                         fields = optarg;
2916                         break;
2917                 case 'd':
2918                         limit = parse_depth(optarg, &flags);
2919                         break;
2920                 case 'r':
2921                         flags |= ZFS_ITER_RECURSE;
2922                         break;
2923                 case 'H':
2924                         scripted = B_TRUE;
2925                         break;
2926                 case 's':
2927                         if (zfs_add_sort_column(&sortcol, optarg,
2928                             B_FALSE) != 0) {
2929                                 (void) fprintf(stderr,
2930                                     gettext("invalid property '%s'\n"), optarg);
2931                                 usage(B_FALSE);
2932                         }
2933                         break;
2934                 case 'S':
2935                         if (zfs_add_sort_column(&sortcol, optarg,
2936                             B_TRUE) != 0) {
2937                                 (void) fprintf(stderr,
2938                                     gettext("invalid property '%s'\n"), optarg);
2939                                 usage(B_FALSE);
2940                         }
2941                         break;
2942                 case 't':
2943                         types = 0;
2944                         types_specified = B_TRUE;
2945                         flags &= ~ZFS_ITER_PROP_LISTSNAPS;
2946                         while (*optarg != '\0') {
2947                                 static char *type_subopts[] = { "filesystem",
2948                                     "volume", "snapshot", "all", NULL };
2949 
2950                                 switch (getsubopt(&optarg, type_subopts,
2951                                     &value)) {
2952                                 case 0:
2953                                         types |= ZFS_TYPE_FILESYSTEM;
2954                                         break;
2955                                 case 1:
2956                                         types |= ZFS_TYPE_VOLUME;
2957                                         break;
2958                                 case 2:
2959                                         types |= ZFS_TYPE_SNAPSHOT;
2960                                         break;
2961                                 case 3:
2962                                         types = ZFS_TYPE_DATASET;
2963                                         break;
2964 
2965                                 default:
2966                                         (void) fprintf(stderr,
2967                                             gettext("invalid type '%s'\n"),
2968                                             value);
2969                                         usage(B_FALSE);
2970                                 }
2971                         }
2972                         break;
2973                 case ':':
2974                         (void) fprintf(stderr, gettext("missing argument for "
2975                             "'%c' option\n"), optopt);
2976                         usage(B_FALSE);
2977                         break;
2978                 case '?':
2979                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
2980                             optopt);
2981                         usage(B_FALSE);
2982                 }
2983         }
2984 
2985         argc -= optind;
2986         argv += optind;
2987 
2988         if (fields == NULL)
2989                 fields = default_fields;
2990 
2991         /*
2992          * If "-o space" and no types were specified, don't display snapshots.
2993          */
2994         if (strcmp(fields, "space") == 0 && types_specified == B_FALSE)
2995                 types &= ~ZFS_TYPE_SNAPSHOT;
2996 
2997         /*
2998          * If the user specifies '-o all', the zprop_get_list() doesn't
2999          * normally include the name of the dataset.  For 'zfs list', we always
3000          * want this property to be first.
3001          */
3002         if (zprop_get_list(g_zfs, fields, &cb.cb_proplist, ZFS_TYPE_DATASET)
3003             != 0)
3004                 usage(B_FALSE);
3005 
3006         cb.cb_scripted = scripted;
3007         cb.cb_first = B_TRUE;
3008 
3009         ret = zfs_for_each(argc, argv, flags, types, sortcol, &cb.cb_proplist,
3010             limit, list_callback, &cb);
3011 
3012         zprop_free_list(cb.cb_proplist);
3013         zfs_free_sort_columns(sortcol);
3014 
3015         if (ret == 0 && cb.cb_first && !cb.cb_scripted)
3016                 (void) printf(gettext("no datasets available\n"));
3017 
3018         return (ret);
3019 }
3020 
3021 /*
3022  * zfs rename [-f] <fs | snap | vol> <fs | snap | vol>
3023  * zfs rename [-f] -p <fs | vol> <fs | vol>
3024  * zfs rename -r <snap> <snap>
3025  *
3026  * Renames the given dataset to another of the same type.
3027  *
3028  * The '-p' flag creates all the non-existing ancestors of the target first.
3029  */
3030 /* ARGSUSED */
3031 static int
3032 zfs_do_rename(int argc, char **argv)
3033 {
3034         zfs_handle_t *zhp;
3035         int c;
3036         int ret = 0;
3037         boolean_t recurse = B_FALSE;
3038         boolean_t parents = B_FALSE;
3039         boolean_t force_unmount = B_FALSE;
3040 
3041         /* check options */
3042         while ((c = getopt(argc, argv, "prf")) != -1) {
3043                 switch (c) {
3044                 case 'p':
3045                         parents = B_TRUE;
3046                         break;
3047                 case 'r':
3048                         recurse = B_TRUE;
3049                         break;
3050                 case 'f':
3051                         force_unmount = B_TRUE;
3052                         break;
3053                 case '?':
3054                 default:
3055                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
3056                             optopt);
3057                         usage(B_FALSE);
3058                 }
3059         }
3060 
3061         argc -= optind;
3062         argv += optind;
3063 
3064         /* check number of arguments */
3065         if (argc < 1) {
3066                 (void) fprintf(stderr, gettext("missing source dataset "
3067                     "argument\n"));
3068                 usage(B_FALSE);
3069         }
3070         if (argc < 2) {
3071                 (void) fprintf(stderr, gettext("missing target dataset "
3072                     "argument\n"));
3073                 usage(B_FALSE);
3074         }
3075         if (argc > 2) {
3076                 (void) fprintf(stderr, gettext("too many arguments\n"));
3077                 usage(B_FALSE);
3078         }
3079 
3080         if (recurse && parents) {
3081                 (void) fprintf(stderr, gettext("-p and -r options are mutually "
3082                     "exclusive\n"));
3083                 usage(B_FALSE);
3084         }
3085 
3086         if (recurse && strchr(argv[0], '@') == 0) {
3087                 (void) fprintf(stderr, gettext("source dataset for recursive "
3088                     "rename must be a snapshot\n"));
3089                 usage(B_FALSE);
3090         }
3091 
3092         if ((zhp = zfs_open(g_zfs, argv[0], parents ? ZFS_TYPE_FILESYSTEM |
3093             ZFS_TYPE_VOLUME : ZFS_TYPE_DATASET)) == NULL)
3094                 return (1);
3095 
3096         /* If we were asked and the name looks good, try to create ancestors. */
3097         if (parents && zfs_name_valid(argv[1], zfs_get_type(zhp)) &&
3098             zfs_create_ancestors(g_zfs, argv[1]) != 0) {
3099                 zfs_close(zhp);
3100                 return (1);
3101         }
3102 
3103         ret = (zfs_rename(zhp, argv[1], recurse, force_unmount) != 0);
3104 
3105         zfs_close(zhp);
3106         return (ret);
3107 }
3108 
3109 /*
3110  * zfs promote <fs>
3111  *
3112  * Promotes the given clone fs to be the parent
3113  */
3114 /* ARGSUSED */
3115 static int
3116 zfs_do_promote(int argc, char **argv)
3117 {
3118         zfs_handle_t *zhp;
3119         int ret = 0;
3120 
3121         /* check options */
3122         if (argc > 1 && argv[1][0] == '-') {
3123                 (void) fprintf(stderr, gettext("invalid option '%c'\n"),
3124                     argv[1][1]);
3125                 usage(B_FALSE);
3126         }
3127 
3128         /* check number of arguments */
3129         if (argc < 2) {
3130                 (void) fprintf(stderr, gettext("missing clone filesystem"
3131                     " argument\n"));
3132                 usage(B_FALSE);
3133         }
3134         if (argc > 2) {
3135                 (void) fprintf(stderr, gettext("too many arguments\n"));
3136                 usage(B_FALSE);
3137         }
3138 
3139         zhp = zfs_open(g_zfs, argv[1], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
3140         if (zhp == NULL)
3141                 return (1);
3142 
3143         ret = (zfs_promote(zhp) != 0);
3144 
3145 
3146         zfs_close(zhp);
3147         return (ret);
3148 }
3149 
3150 /*
3151  * zfs rollback [-rRf] <snapshot>
3152  *
3153  *      -r      Delete any intervening snapshots before doing rollback
3154  *      -R      Delete any snapshots and their clones
3155  *      -f      ignored for backwards compatability
3156  *
3157  * Given a filesystem, rollback to a specific snapshot, discarding any changes
3158  * since then and making it the active dataset.  If more recent snapshots exist,
3159  * the command will complain unless the '-r' flag is given.
3160  */
3161 typedef struct rollback_cbdata {
3162         uint64_t        cb_create;
3163         boolean_t       cb_first;
3164         int             cb_doclones;
3165         char            *cb_target;
3166         int             cb_error;
3167         boolean_t       cb_recurse;
3168         boolean_t       cb_dependent;
3169 } rollback_cbdata_t;
3170 
3171 /*
3172  * Report any snapshots more recent than the one specified.  Used when '-r' is
3173  * not specified.  We reuse this same callback for the snapshot dependents - if
3174  * 'cb_dependent' is set, then this is a dependent and we should report it
3175  * without checking the transaction group.
3176  */
3177 static int
3178 rollback_check(zfs_handle_t *zhp, void *data)
3179 {
3180         rollback_cbdata_t *cbp = data;
3181 
3182         if (cbp->cb_doclones) {
3183                 zfs_close(zhp);
3184                 return (0);
3185         }
3186 
3187         if (!cbp->cb_dependent) {
3188                 if (strcmp(zfs_get_name(zhp), cbp->cb_target) != 0 &&
3189                     zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
3190                     zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) >
3191                     cbp->cb_create) {
3192 
3193                         if (cbp->cb_first && !cbp->cb_recurse) {
3194                                 (void) fprintf(stderr, gettext("cannot "
3195                                     "rollback to '%s': more recent snapshots "
3196                                     "exist\n"),
3197                                     cbp->cb_target);
3198                                 (void) fprintf(stderr, gettext("use '-r' to "
3199                                     "force deletion of the following "
3200                                     "snapshots:\n"));
3201                                 cbp->cb_first = 0;
3202                                 cbp->cb_error = 1;
3203                         }
3204 
3205                         if (cbp->cb_recurse) {
3206                                 cbp->cb_dependent = B_TRUE;
3207                                 if (zfs_iter_dependents(zhp, B_TRUE,
3208                                     rollback_check, cbp) != 0) {
3209                                         zfs_close(zhp);
3210                                         return (-1);
3211                                 }
3212                                 cbp->cb_dependent = B_FALSE;
3213                         } else {
3214                                 (void) fprintf(stderr, "%s\n",
3215                                     zfs_get_name(zhp));
3216                         }
3217                 }
3218         } else {
3219                 if (cbp->cb_first && cbp->cb_recurse) {
3220                         (void) fprintf(stderr, gettext("cannot rollback to "
3221                             "'%s': clones of previous snapshots exist\n"),
3222                             cbp->cb_target);
3223                         (void) fprintf(stderr, gettext("use '-R' to "
3224                             "force deletion of the following clones and "
3225                             "dependents:\n"));
3226                         cbp->cb_first = 0;
3227                         cbp->cb_error = 1;
3228                 }
3229 
3230                 (void) fprintf(stderr, "%s\n", zfs_get_name(zhp));
3231         }
3232 
3233         zfs_close(zhp);
3234         return (0);
3235 }
3236 
3237 static int
3238 zfs_do_rollback(int argc, char **argv)
3239 {
3240         int ret = 0;
3241         int c;
3242         boolean_t force = B_FALSE;
3243         rollback_cbdata_t cb = { 0 };
3244         zfs_handle_t *zhp, *snap;
3245         char parentname[ZFS_MAXNAMELEN];
3246         char *delim;
3247 
3248         /* check options */
3249         while ((c = getopt(argc, argv, "rRf")) != -1) {
3250                 switch (c) {
3251                 case 'r':
3252                         cb.cb_recurse = 1;
3253                         break;
3254                 case 'R':
3255                         cb.cb_recurse = 1;
3256                         cb.cb_doclones = 1;
3257                         break;
3258                 case 'f':
3259                         force = B_TRUE;
3260                         break;
3261                 case '?':
3262                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
3263                             optopt);
3264                         usage(B_FALSE);
3265                 }
3266         }
3267 
3268         argc -= optind;
3269         argv += optind;
3270 
3271         /* check number of arguments */
3272         if (argc < 1) {
3273                 (void) fprintf(stderr, gettext("missing dataset argument\n"));
3274                 usage(B_FALSE);
3275         }
3276         if (argc > 1) {
3277                 (void) fprintf(stderr, gettext("too many arguments\n"));
3278                 usage(B_FALSE);
3279         }
3280 
3281         /* open the snapshot */
3282         if ((snap = zfs_open(g_zfs, argv[0], ZFS_TYPE_SNAPSHOT)) == NULL)
3283                 return (1);
3284 
3285         /* open the parent dataset */
3286         (void) strlcpy(parentname, argv[0], sizeof (parentname));
3287         verify((delim = strrchr(parentname, '@')) != NULL);
3288         *delim = '\0';
3289         if ((zhp = zfs_open(g_zfs, parentname, ZFS_TYPE_DATASET)) == NULL) {
3290                 zfs_close(snap);
3291                 return (1);
3292         }
3293 
3294         /*
3295          * Check for more recent snapshots and/or clones based on the presence
3296          * of '-r' and '-R'.
3297          */
3298         cb.cb_target = argv[0];
3299         cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
3300         cb.cb_first = B_TRUE;
3301         cb.cb_error = 0;
3302         if ((ret = zfs_iter_children(zhp, rollback_check, &cb)) != 0)
3303                 goto out;
3304 
3305         if ((ret = cb.cb_error) != 0)
3306                 goto out;
3307 
3308         /*
3309          * Rollback parent to the given snapshot.
3310          */
3311         ret = zfs_rollback(zhp, snap, force);
3312 
3313 out:
3314         zfs_close(snap);
3315         zfs_close(zhp);
3316 
3317         if (ret == 0)
3318                 return (0);
3319         else
3320                 return (1);
3321 }
3322 
3323 /*
3324  * zfs set property=value { fs | snap | vol } ...
3325  *
3326  * Sets the given property for all datasets specified on the command line.
3327  */
3328 typedef struct set_cbdata {
3329         char            *cb_propname;
3330         char            *cb_value;
3331 } set_cbdata_t;
3332 
3333 static int
3334 set_callback(zfs_handle_t *zhp, void *data)
3335 {
3336         set_cbdata_t *cbp = data;
3337 
3338         if (zfs_prop_set(zhp, cbp->cb_propname, cbp->cb_value) != 0) {
3339                 switch (libzfs_errno(g_zfs)) {
3340                 case EZFS_MOUNTFAILED:
3341                         (void) fprintf(stderr, gettext("property may be set "
3342                             "but unable to remount filesystem\n"));
3343                         break;
3344                 case EZFS_SHARENFSFAILED:
3345                         (void) fprintf(stderr, gettext("property may be set "
3346                             "but unable to reshare filesystem\n"));
3347                         break;
3348                 }
3349                 return (1);
3350         }
3351         return (0);
3352 }
3353 
3354 static int
3355 zfs_do_set(int argc, char **argv)
3356 {
3357         set_cbdata_t cb;
3358         int ret = 0;
3359 
3360         /* check for options */
3361         if (argc > 1 && argv[1][0] == '-') {
3362                 (void) fprintf(stderr, gettext("invalid option '%c'\n"),
3363                     argv[1][1]);
3364                 usage(B_FALSE);
3365         }
3366 
3367         /* check number of arguments */
3368         if (argc < 2) {
3369                 (void) fprintf(stderr, gettext("missing property=value "
3370                     "argument\n"));
3371                 usage(B_FALSE);
3372         }
3373         if (argc < 3) {
3374                 (void) fprintf(stderr, gettext("missing dataset name\n"));
3375                 usage(B_FALSE);
3376         }
3377 
3378         /* validate property=value argument */
3379         cb.cb_propname = argv[1];
3380         if (((cb.cb_value = strchr(cb.cb_propname, '=')) == NULL) ||
3381             (cb.cb_value[1] == '\0')) {
3382                 (void) fprintf(stderr, gettext("missing value in "
3383                     "property=value argument\n"));
3384                 usage(B_FALSE);
3385         }
3386 
3387         *cb.cb_value = '\0';
3388         cb.cb_value++;
3389 
3390         if (*cb.cb_propname == '\0') {
3391                 (void) fprintf(stderr,
3392                     gettext("missing property in property=value argument\n"));
3393                 usage(B_FALSE);
3394         }
3395 
3396         ret = zfs_for_each(argc - 2, argv + 2, NULL,
3397             ZFS_TYPE_DATASET, NULL, NULL, 0, set_callback, &cb);
3398 
3399         return (ret);
3400 }
3401 
3402 typedef struct snap_cbdata {
3403         nvlist_t *sd_nvl;
3404         boolean_t sd_recursive;
3405         const char *sd_snapname;
3406 } snap_cbdata_t;
3407 
3408 static int
3409 zfs_snapshot_cb(zfs_handle_t *zhp, void *arg)
3410 {
3411         snap_cbdata_t *sd = arg;
3412         char *name;
3413         int rv = 0;
3414         int error;
3415 
3416         error = asprintf(&name, "%s@%s", zfs_get_name(zhp), sd->sd_snapname);
3417         if (error == -1)
3418                 nomem();
3419         fnvlist_add_boolean(sd->sd_nvl, name);
3420         free(name);
3421 
3422         if (sd->sd_recursive)
3423                 rv = zfs_iter_filesystems(zhp, zfs_snapshot_cb, sd);
3424         zfs_close(zhp);
3425         return (rv);
3426 }
3427 
3428 /*
3429  * zfs snapshot [-r] [-o prop=value] ... <fs@snap>
3430  *
3431  * Creates a snapshot with the given name.  While functionally equivalent to
3432  * 'zfs create', it is a separate command to differentiate intent.
3433  */
3434 static int
3435 zfs_do_snapshot(int argc, char **argv)
3436 {
3437         int ret = 0;
3438         char c;
3439         nvlist_t *props;
3440         snap_cbdata_t sd = { 0 };
3441         boolean_t multiple_snaps = B_FALSE;
3442 
3443         if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0)
3444                 nomem();
3445         if (nvlist_alloc(&sd.sd_nvl, NV_UNIQUE_NAME, 0) != 0)
3446                 nomem();
3447 
3448         /* check options */
3449         while ((c = getopt(argc, argv, "ro:")) != -1) {
3450                 switch (c) {
3451                 case 'o':
3452                         if (parseprop(props))
3453                                 return (1);
3454                         break;
3455                 case 'r':
3456                         sd.sd_recursive = B_TRUE;
3457                         multiple_snaps = B_TRUE;
3458                         break;
3459                 case '?':
3460                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
3461                             optopt);
3462                         goto usage;
3463                 }
3464         }
3465 
3466         argc -= optind;
3467         argv += optind;
3468 
3469         /* check number of arguments */
3470         if (argc < 1) {
3471                 (void) fprintf(stderr, gettext("missing snapshot argument\n"));
3472                 goto usage;
3473         }
3474 
3475         if (argc > 1)
3476                 multiple_snaps = B_TRUE;
3477         for (; argc > 0; argc--, argv++) {
3478                 char *atp;
3479                 zfs_handle_t *zhp;
3480 
3481                 atp = strchr(argv[0], '@');
3482                 if (atp == NULL)
3483                         goto usage;
3484                 *atp = '\0';
3485                 sd.sd_snapname = atp + 1;
3486                 zhp = zfs_open(g_zfs, argv[0],
3487                     ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
3488                 if (zhp == NULL)
3489                         goto usage;
3490                 if (zfs_snapshot_cb(zhp, &sd) != 0)
3491                         goto usage;
3492         }
3493 
3494         ret = zfs_snapshot_nvl(g_zfs, sd.sd_nvl, props);
3495         nvlist_free(sd.sd_nvl);
3496         nvlist_free(props);
3497         if (ret != 0 && multiple_snaps)
3498                 (void) fprintf(stderr, gettext("no snapshots were created\n"));
3499         return (ret != 0);
3500 
3501 usage:
3502         nvlist_free(sd.sd_nvl);
3503         nvlist_free(props);
3504         usage(B_FALSE);
3505         return (-1);
3506 }
3507 
3508 /*
3509  * Send a backup stream to stdout.
3510  */
3511 static int
3512 zfs_do_send(int argc, char **argv)
3513 {
3514         char *fromname = NULL;
3515         char *toname = NULL;
3516         char *cp;
3517         zfs_handle_t *zhp;
3518         sendflags_t flags = { 0 };
3519         int c, err;
3520         nvlist_t *dbgnv = NULL;
3521         boolean_t extraverbose = B_FALSE;
3522 
3523         /* check options */
3524         while ((c = getopt(argc, argv, ":i:I:RDpvnP")) != -1) {
3525                 switch (c) {
3526                 case 'i':
3527                         if (fromname)
3528                                 usage(B_FALSE);
3529                         fromname = optarg;
3530                         break;
3531                 case 'I':
3532                         if (fromname)
3533                                 usage(B_FALSE);
3534                         fromname = optarg;
3535                         flags.doall = B_TRUE;
3536                         break;
3537                 case 'R':
3538                         flags.replicate = B_TRUE;
3539                         break;
3540                 case 'p':
3541                         flags.props = B_TRUE;
3542                         break;
3543                 case 'P':
3544                         flags.parsable = B_TRUE;
3545                         flags.verbose = B_TRUE;
3546                         break;
3547                 case 'v':
3548                         if (flags.verbose)
3549                                 extraverbose = B_TRUE;
3550                         flags.verbose = B_TRUE;
3551                         flags.progress = B_TRUE;
3552                         break;
3553                 case 'D':
3554                         flags.dedup = B_TRUE;
3555                         break;
3556                 case 'n':
3557                         flags.dryrun = B_TRUE;
3558                         break;
3559                 case ':':
3560                         (void) fprintf(stderr, gettext("missing argument for "
3561                             "'%c' option\n"), optopt);
3562                         usage(B_FALSE);
3563                         break;
3564                 case '?':
3565                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
3566                             optopt);
3567                         usage(B_FALSE);
3568                 }
3569         }
3570 
3571         argc -= optind;
3572         argv += optind;
3573 
3574         /* check number of arguments */
3575         if (argc < 1) {
3576                 (void) fprintf(stderr, gettext("missing snapshot argument\n"));
3577                 usage(B_FALSE);
3578         }
3579         if (argc > 1) {
3580                 (void) fprintf(stderr, gettext("too many arguments\n"));
3581                 usage(B_FALSE);
3582         }
3583 
3584         if (!flags.dryrun && isatty(STDOUT_FILENO)) {
3585                 (void) fprintf(stderr,
3586                     gettext("Error: Stream can not be written to a terminal.\n"
3587                     "You must redirect standard output.\n"));
3588                 return (1);
3589         }
3590 
3591         cp = strchr(argv[0], '@');
3592         if (cp == NULL) {
3593                 (void) fprintf(stderr,
3594                     gettext("argument must be a snapshot\n"));
3595                 usage(B_FALSE);
3596         }
3597         *cp = '\0';
3598         toname = cp + 1;
3599         zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
3600         if (zhp == NULL)
3601                 return (1);
3602 
3603         /*
3604          * If they specified the full path to the snapshot, chop off
3605          * everything except the short name of the snapshot, but special
3606          * case if they specify the origin.
3607          */
3608         if (fromname && (cp = strchr(fromname, '@')) != NULL) {
3609                 char origin[ZFS_MAXNAMELEN];
3610                 zprop_source_t src;
3611 
3612                 (void) zfs_prop_get(zhp, ZFS_PROP_ORIGIN,
3613                     origin, sizeof (origin), &src, NULL, 0, B_FALSE);
3614 
3615                 if (strcmp(origin, fromname) == 0) {
3616                         fromname = NULL;
3617                         flags.fromorigin = B_TRUE;
3618                 } else {
3619                         *cp = '\0';
3620                         if (cp != fromname && strcmp(argv[0], fromname)) {
3621                                 (void) fprintf(stderr,
3622                                     gettext("incremental source must be "
3623                                     "in same filesystem\n"));
3624                                 usage(B_FALSE);
3625                         }
3626                         fromname = cp + 1;
3627                         if (strchr(fromname, '@') || strchr(fromname, '/')) {
3628                                 (void) fprintf(stderr,
3629                                     gettext("invalid incremental source\n"));
3630                                 usage(B_FALSE);
3631                         }
3632                 }
3633         }
3634 
3635         if (flags.replicate && fromname == NULL)
3636                 flags.doall = B_TRUE;
3637 
3638         err = zfs_send(zhp, fromname, toname, &flags, STDOUT_FILENO, NULL, 0,
3639             extraverbose ? &dbgnv : NULL);
3640 
3641         if (extraverbose && dbgnv != NULL) {
3642                 /*
3643                  * dump_nvlist prints to stdout, but that's been
3644                  * redirected to a file.  Make it print to stderr
3645                  * instead.
3646                  */
3647                 (void) dup2(STDERR_FILENO, STDOUT_FILENO);
3648                 dump_nvlist(dbgnv, 0);
3649                 nvlist_free(dbgnv);
3650         }
3651         zfs_close(zhp);
3652 
3653         return (err != 0);
3654 }
3655 
3656 /*
3657  * zfs receive [-vnFu] [-d | -e] <fs@snap>
3658  *
3659  * Restore a backup stream from stdin.
3660  */
3661 static int
3662 zfs_do_receive(int argc, char **argv)
3663 {
3664         int c, err;
3665         recvflags_t flags = { 0 };
3666 
3667         /* check options */
3668         while ((c = getopt(argc, argv, ":denuvF")) != -1) {
3669                 switch (c) {
3670                 case 'd':
3671                         flags.isprefix = B_TRUE;
3672                         break;
3673                 case 'e':
3674                         flags.isprefix = B_TRUE;
3675                         flags.istail = B_TRUE;
3676                         break;
3677                 case 'n':
3678                         flags.dryrun = B_TRUE;
3679                         break;
3680                 case 'u':
3681                         flags.nomount = B_TRUE;
3682                         break;
3683                 case 'v':
3684                         flags.verbose = B_TRUE;
3685                         break;
3686                 case 'F':
3687                         flags.force = B_TRUE;
3688                         break;
3689                 case ':':
3690                         (void) fprintf(stderr, gettext("missing argument for "
3691                             "'%c' option\n"), optopt);
3692                         usage(B_FALSE);
3693                         break;
3694                 case '?':
3695                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
3696                             optopt);
3697                         usage(B_FALSE);
3698                 }
3699         }
3700 
3701         argc -= optind;
3702         argv += optind;
3703 
3704         /* check number of arguments */
3705         if (argc < 1) {
3706                 (void) fprintf(stderr, gettext("missing snapshot argument\n"));
3707                 usage(B_FALSE);
3708         }
3709         if (argc > 1) {
3710                 (void) fprintf(stderr, gettext("too many arguments\n"));
3711                 usage(B_FALSE);
3712         }
3713 
3714         if (isatty(STDIN_FILENO)) {
3715                 (void) fprintf(stderr,
3716                     gettext("Error: Backup stream can not be read "
3717                     "from a terminal.\n"
3718                     "You must redirect standard input.\n"));
3719                 return (1);
3720         }
3721 
3722         err = zfs_receive(g_zfs, argv[0], &flags, STDIN_FILENO, NULL);
3723 
3724         return (err != 0);
3725 }
3726 
3727 /*
3728  * allow/unallow stuff
3729  */
3730 /* copied from zfs/sys/dsl_deleg.h */
3731 #define ZFS_DELEG_PERM_CREATE           "create"
3732 #define ZFS_DELEG_PERM_DESTROY          "destroy"
3733 #define ZFS_DELEG_PERM_SNAPSHOT         "snapshot"
3734 #define ZFS_DELEG_PERM_ROLLBACK         "rollback"
3735 #define ZFS_DELEG_PERM_CLONE            "clone"
3736 #define ZFS_DELEG_PERM_PROMOTE          "promote"
3737 #define ZFS_DELEG_PERM_RENAME           "rename"
3738 #define ZFS_DELEG_PERM_MOUNT            "mount"
3739 #define ZFS_DELEG_PERM_SHARE            "share"
3740 #define ZFS_DELEG_PERM_SEND             "send"
3741 #define ZFS_DELEG_PERM_RECEIVE          "receive"
3742 #define ZFS_DELEG_PERM_ALLOW            "allow"
3743 #define ZFS_DELEG_PERM_USERPROP         "userprop"
3744 #define ZFS_DELEG_PERM_VSCAN            "vscan" /* ??? */
3745 #define ZFS_DELEG_PERM_USERQUOTA        "userquota"
3746 #define ZFS_DELEG_PERM_GROUPQUOTA       "groupquota"
3747 #define ZFS_DELEG_PERM_USERUSED         "userused"
3748 #define ZFS_DELEG_PERM_GROUPUSED        "groupused"
3749 #define ZFS_DELEG_PERM_HOLD             "hold"
3750 #define ZFS_DELEG_PERM_RELEASE          "release"
3751 #define ZFS_DELEG_PERM_DIFF             "diff"
3752 
3753 #define ZFS_NUM_DELEG_NOTES ZFS_DELEG_NOTE_NONE
3754 
3755 static zfs_deleg_perm_tab_t zfs_deleg_perm_tbl[] = {
3756         { ZFS_DELEG_PERM_ALLOW, ZFS_DELEG_NOTE_ALLOW },
3757         { ZFS_DELEG_PERM_CLONE, ZFS_DELEG_NOTE_CLONE },
3758         { ZFS_DELEG_PERM_CREATE, ZFS_DELEG_NOTE_CREATE },
3759         { ZFS_DELEG_PERM_DESTROY, ZFS_DELEG_NOTE_DESTROY },
3760         { ZFS_DELEG_PERM_DIFF, ZFS_DELEG_NOTE_DIFF},
3761         { ZFS_DELEG_PERM_HOLD, ZFS_DELEG_NOTE_HOLD },
3762         { ZFS_DELEG_PERM_MOUNT, ZFS_DELEG_NOTE_MOUNT },
3763         { ZFS_DELEG_PERM_PROMOTE, ZFS_DELEG_NOTE_PROMOTE },
3764         { ZFS_DELEG_PERM_RECEIVE, ZFS_DELEG_NOTE_RECEIVE },
3765         { ZFS_DELEG_PERM_RELEASE, ZFS_DELEG_NOTE_RELEASE },
3766         { ZFS_DELEG_PERM_RENAME, ZFS_DELEG_NOTE_RENAME },
3767         { ZFS_DELEG_PERM_ROLLBACK, ZFS_DELEG_NOTE_ROLLBACK },
3768         { ZFS_DELEG_PERM_SEND, ZFS_DELEG_NOTE_SEND },
3769         { ZFS_DELEG_PERM_SHARE, ZFS_DELEG_NOTE_SHARE },
3770         { ZFS_DELEG_PERM_SNAPSHOT, ZFS_DELEG_NOTE_SNAPSHOT },
3771 
3772         { ZFS_DELEG_PERM_GROUPQUOTA, ZFS_DELEG_NOTE_GROUPQUOTA },
3773         { ZFS_DELEG_PERM_GROUPUSED, ZFS_DELEG_NOTE_GROUPUSED },
3774         { ZFS_DELEG_PERM_USERPROP, ZFS_DELEG_NOTE_USERPROP },
3775         { ZFS_DELEG_PERM_USERQUOTA, ZFS_DELEG_NOTE_USERQUOTA },
3776         { ZFS_DELEG_PERM_USERUSED, ZFS_DELEG_NOTE_USERUSED },
3777         { NULL, ZFS_DELEG_NOTE_NONE }
3778 };
3779 
3780 /* permission structure */
3781 typedef struct deleg_perm {
3782         zfs_deleg_who_type_t    dp_who_type;
3783         const char              *dp_name;
3784         boolean_t               dp_local;
3785         boolean_t               dp_descend;
3786 } deleg_perm_t;
3787 
3788 /* */
3789 typedef struct deleg_perm_node {
3790         deleg_perm_t            dpn_perm;
3791 
3792         uu_avl_node_t           dpn_avl_node;
3793 } deleg_perm_node_t;
3794 
3795 typedef struct fs_perm fs_perm_t;
3796 
3797 /* permissions set */
3798 typedef struct who_perm {
3799         zfs_deleg_who_type_t    who_type;
3800         const char              *who_name;              /* id */
3801         char                    who_ug_name[256];       /* user/group name */
3802         fs_perm_t               *who_fsperm;            /* uplink */
3803 
3804         uu_avl_t                *who_deleg_perm_avl;    /* permissions */
3805 } who_perm_t;
3806 
3807 /* */
3808 typedef struct who_perm_node {
3809         who_perm_t      who_perm;
3810         uu_avl_node_t   who_avl_node;
3811 } who_perm_node_t;
3812 
3813 typedef struct fs_perm_set fs_perm_set_t;
3814 /* fs permissions */
3815 struct fs_perm {
3816         const char              *fsp_name;
3817 
3818         uu_avl_t                *fsp_sc_avl;    /* sets,create */
3819         uu_avl_t                *fsp_uge_avl;   /* user,group,everyone */
3820 
3821         fs_perm_set_t           *fsp_set;       /* uplink */
3822 };
3823 
3824 /* */
3825 typedef struct fs_perm_node {
3826         fs_perm_t       fspn_fsperm;
3827         uu_avl_t        *fspn_avl;
3828 
3829         uu_list_node_t  fspn_list_node;
3830 } fs_perm_node_t;
3831 
3832 /* top level structure */
3833 struct fs_perm_set {
3834         uu_list_pool_t  *fsps_list_pool;
3835         uu_list_t       *fsps_list; /* list of fs_perms */
3836 
3837         uu_avl_pool_t   *fsps_named_set_avl_pool;
3838         uu_avl_pool_t   *fsps_who_perm_avl_pool;
3839         uu_avl_pool_t   *fsps_deleg_perm_avl_pool;
3840 };
3841 
3842 static inline const char *
3843 deleg_perm_type(zfs_deleg_note_t note)
3844 {
3845         /* subcommands */
3846         switch (note) {
3847                 /* SUBCOMMANDS */
3848                 /* OTHER */
3849         case ZFS_DELEG_NOTE_GROUPQUOTA:
3850         case ZFS_DELEG_NOTE_GROUPUSED:
3851         case ZFS_DELEG_NOTE_USERPROP:
3852         case ZFS_DELEG_NOTE_USERQUOTA:
3853         case ZFS_DELEG_NOTE_USERUSED:
3854                 /* other */
3855                 return (gettext("other"));
3856         default:
3857                 return (gettext("subcommand"));
3858         }
3859 }
3860 
3861 static int inline
3862 who_type2weight(zfs_deleg_who_type_t who_type)
3863 {
3864         int res;
3865         switch (who_type) {
3866                 case ZFS_DELEG_NAMED_SET_SETS:
3867                 case ZFS_DELEG_NAMED_SET:
3868                         res = 0;
3869                         break;
3870                 case ZFS_DELEG_CREATE_SETS:
3871                 case ZFS_DELEG_CREATE:
3872                         res = 1;
3873                         break;
3874                 case ZFS_DELEG_USER_SETS:
3875                 case ZFS_DELEG_USER:
3876                         res = 2;
3877                         break;
3878                 case ZFS_DELEG_GROUP_SETS:
3879                 case ZFS_DELEG_GROUP:
3880                         res = 3;
3881                         break;
3882                 case ZFS_DELEG_EVERYONE_SETS:
3883                 case ZFS_DELEG_EVERYONE:
3884                         res = 4;
3885                         break;
3886                 default:
3887                         res = -1;
3888         }
3889 
3890         return (res);
3891 }
3892 
3893 /* ARGSUSED */
3894 static int
3895 who_perm_compare(const void *larg, const void *rarg, void *unused)
3896 {
3897         const who_perm_node_t *l = larg;
3898         const who_perm_node_t *r = rarg;
3899         zfs_deleg_who_type_t ltype = l->who_perm.who_type;
3900         zfs_deleg_who_type_t rtype = r->who_perm.who_type;
3901         int lweight = who_type2weight(ltype);
3902         int rweight = who_type2weight(rtype);
3903         int res = lweight - rweight;
3904         if (res == 0)
3905                 res = strncmp(l->who_perm.who_name, r->who_perm.who_name,
3906                     ZFS_MAX_DELEG_NAME-1);
3907 
3908         if (res == 0)
3909                 return (0);
3910         if (res > 0)
3911                 return (1);
3912         else
3913                 return (-1);
3914 }
3915 
3916 /* ARGSUSED */
3917 static int
3918 deleg_perm_compare(const void *larg, const void *rarg, void *unused)
3919 {
3920         const deleg_perm_node_t *l = larg;
3921         const deleg_perm_node_t *r = rarg;
3922         int res =  strncmp(l->dpn_perm.dp_name, r->dpn_perm.dp_name,
3923             ZFS_MAX_DELEG_NAME-1);
3924 
3925         if (res == 0)
3926                 return (0);
3927 
3928         if (res > 0)
3929                 return (1);
3930         else
3931                 return (-1);
3932 }
3933 
3934 static inline void
3935 fs_perm_set_init(fs_perm_set_t *fspset)
3936 {
3937         bzero(fspset, sizeof (fs_perm_set_t));
3938 
3939         if ((fspset->fsps_list_pool = uu_list_pool_create("fsps_list_pool",
3940             sizeof (fs_perm_node_t), offsetof(fs_perm_node_t, fspn_list_node),
3941             NULL, UU_DEFAULT)) == NULL)
3942                 nomem();
3943         if ((fspset->fsps_list = uu_list_create(fspset->fsps_list_pool, NULL,
3944             UU_DEFAULT)) == NULL)
3945                 nomem();
3946 
3947         if ((fspset->fsps_named_set_avl_pool = uu_avl_pool_create(
3948             "named_set_avl_pool", sizeof (who_perm_node_t), offsetof(
3949             who_perm_node_t, who_avl_node), who_perm_compare,
3950             UU_DEFAULT)) == NULL)
3951                 nomem();
3952 
3953         if ((fspset->fsps_who_perm_avl_pool = uu_avl_pool_create(
3954             "who_perm_avl_pool", sizeof (who_perm_node_t), offsetof(
3955             who_perm_node_t, who_avl_node), who_perm_compare,
3956             UU_DEFAULT)) == NULL)
3957                 nomem();
3958 
3959         if ((fspset->fsps_deleg_perm_avl_pool = uu_avl_pool_create(
3960             "deleg_perm_avl_pool", sizeof (deleg_perm_node_t), offsetof(
3961             deleg_perm_node_t, dpn_avl_node), deleg_perm_compare, UU_DEFAULT))
3962             == NULL)
3963                 nomem();
3964 }
3965 
3966 static inline void fs_perm_fini(fs_perm_t *);
3967 static inline void who_perm_fini(who_perm_t *);
3968 
3969 static inline void
3970 fs_perm_set_fini(fs_perm_set_t *fspset)
3971 {
3972         fs_perm_node_t *node = uu_list_first(fspset->fsps_list);
3973 
3974         while (node != NULL) {
3975                 fs_perm_node_t *next_node =
3976                     uu_list_next(fspset->fsps_list, node);
3977                 fs_perm_t *fsperm = &node->fspn_fsperm;
3978                 fs_perm_fini(fsperm);
3979                 uu_list_remove(fspset->fsps_list, node);
3980                 free(node);
3981                 node = next_node;
3982         }
3983 
3984         uu_avl_pool_destroy(fspset->fsps_named_set_avl_pool);
3985         uu_avl_pool_destroy(fspset->fsps_who_perm_avl_pool);
3986         uu_avl_pool_destroy(fspset->fsps_deleg_perm_avl_pool);
3987 }
3988 
3989 static inline void
3990 deleg_perm_init(deleg_perm_t *deleg_perm, zfs_deleg_who_type_t type,
3991     const char *name)
3992 {
3993         deleg_perm->dp_who_type = type;
3994         deleg_perm->dp_name = name;
3995 }
3996 
3997 static inline void
3998 who_perm_init(who_perm_t *who_perm, fs_perm_t *fsperm,
3999     zfs_deleg_who_type_t type, const char *name)
4000 {
4001         uu_avl_pool_t   *pool;
4002         pool = fsperm->fsp_set->fsps_deleg_perm_avl_pool;
4003 
4004         bzero(who_perm, sizeof (who_perm_t));
4005 
4006         if ((who_perm->who_deleg_perm_avl = uu_avl_create(pool, NULL,
4007             UU_DEFAULT)) == NULL)
4008                 nomem();
4009 
4010         who_perm->who_type = type;
4011         who_perm->who_name = name;
4012         who_perm->who_fsperm = fsperm;
4013 }
4014 
4015 static inline void
4016 who_perm_fini(who_perm_t *who_perm)
4017 {
4018         deleg_perm_node_t *node = uu_avl_first(who_perm->who_deleg_perm_avl);
4019 
4020         while (node != NULL) {
4021                 deleg_perm_node_t *next_node =
4022                     uu_avl_next(who_perm->who_deleg_perm_avl, node);
4023 
4024                 uu_avl_remove(who_perm->who_deleg_perm_avl, node);
4025                 free(node);
4026                 node = next_node;
4027         }
4028 
4029         uu_avl_destroy(who_perm->who_deleg_perm_avl);
4030 }
4031 
4032 static inline void
4033 fs_perm_init(fs_perm_t *fsperm, fs_perm_set_t *fspset, const char *fsname)
4034 {
4035         uu_avl_pool_t   *nset_pool = fspset->fsps_named_set_avl_pool;
4036         uu_avl_pool_t   *who_pool = fspset->fsps_who_perm_avl_pool;
4037 
4038         bzero(fsperm, sizeof (fs_perm_t));
4039 
4040         if ((fsperm->fsp_sc_avl = uu_avl_create(nset_pool, NULL, UU_DEFAULT))
4041             == NULL)
4042                 nomem();
4043 
4044         if ((fsperm->fsp_uge_avl = uu_avl_create(who_pool, NULL, UU_DEFAULT))
4045             == NULL)
4046                 nomem();
4047 
4048         fsperm->fsp_set = fspset;
4049         fsperm->fsp_name = fsname;
4050 }
4051 
4052 static inline void
4053 fs_perm_fini(fs_perm_t *fsperm)
4054 {
4055         who_perm_node_t *node = uu_avl_first(fsperm->fsp_sc_avl);
4056         while (node != NULL) {
4057                 who_perm_node_t *next_node = uu_avl_next(fsperm->fsp_sc_avl,
4058                     node);
4059                 who_perm_t *who_perm = &node->who_perm;
4060                 who_perm_fini(who_perm);
4061                 uu_avl_remove(fsperm->fsp_sc_avl, node);
4062                 free(node);
4063                 node = next_node;
4064         }
4065 
4066         node = uu_avl_first(fsperm->fsp_uge_avl);
4067         while (node != NULL) {
4068                 who_perm_node_t *next_node = uu_avl_next(fsperm->fsp_uge_avl,
4069                     node);
4070                 who_perm_t *who_perm = &node->who_perm;
4071                 who_perm_fini(who_perm);
4072                 uu_avl_remove(fsperm->fsp_uge_avl, node);
4073                 free(node);
4074                 node = next_node;
4075         }
4076 
4077         uu_avl_destroy(fsperm->fsp_sc_avl);
4078         uu_avl_destroy(fsperm->fsp_uge_avl);
4079 }
4080 
4081 static void inline
4082 set_deleg_perm_node(uu_avl_t *avl, deleg_perm_node_t *node,
4083     zfs_deleg_who_type_t who_type, const char *name, char locality)
4084 {
4085         uu_avl_index_t idx = 0;
4086 
4087         deleg_perm_node_t *found_node = NULL;
4088         deleg_perm_t    *deleg_perm = &node->dpn_perm;
4089 
4090         deleg_perm_init(deleg_perm, who_type, name);
4091 
4092         if ((found_node = uu_avl_find(avl, node, NULL, &idx))
4093             == NULL)
4094                 uu_avl_insert(avl, node, idx);
4095         else {
4096                 node = found_node;
4097                 deleg_perm = &node->dpn_perm;
4098         }
4099 
4100 
4101         switch (locality) {
4102         case ZFS_DELEG_LOCAL:
4103                 deleg_perm->dp_local = B_TRUE;
4104                 break;
4105         case ZFS_DELEG_DESCENDENT:
4106                 deleg_perm->dp_descend = B_TRUE;
4107                 break;
4108         case ZFS_DELEG_NA:
4109                 break;
4110         default:
4111                 assert(B_FALSE); /* invalid locality */
4112         }
4113 }
4114 
4115 static inline int
4116 parse_who_perm(who_perm_t *who_perm, nvlist_t *nvl, char locality)
4117 {
4118         nvpair_t *nvp = NULL;
4119         fs_perm_set_t *fspset = who_perm->who_fsperm->fsp_set;
4120         uu_avl_t *avl = who_perm->who_deleg_perm_avl;
4121         zfs_deleg_who_type_t who_type = who_perm->who_type;
4122 
4123         while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
4124                 const char *name = nvpair_name(nvp);
4125                 data_type_t type = nvpair_type(nvp);
4126                 uu_avl_pool_t *avl_pool = fspset->fsps_deleg_perm_avl_pool;
4127                 deleg_perm_node_t *node =
4128                     safe_malloc(sizeof (deleg_perm_node_t));
4129 
4130                 assert(type == DATA_TYPE_BOOLEAN);
4131 
4132                 uu_avl_node_init(node, &node->dpn_avl_node, avl_pool);
4133                 set_deleg_perm_node(avl, node, who_type, name, locality);
4134         }
4135 
4136         return (0);
4137 }
4138 
4139 static inline int
4140 parse_fs_perm(fs_perm_t *fsperm, nvlist_t *nvl)
4141 {
4142         nvpair_t *nvp = NULL;
4143         fs_perm_set_t *fspset = fsperm->fsp_set;
4144 
4145         while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
4146                 nvlist_t *nvl2 = NULL;
4147                 const char *name = nvpair_name(nvp);
4148                 uu_avl_t *avl = NULL;
4149                 uu_avl_pool_t *avl_pool;
4150                 zfs_deleg_who_type_t perm_type = name[0];
4151                 char perm_locality = name[1];
4152                 const char *perm_name = name + 3;
4153                 boolean_t is_set = B_TRUE;
4154                 who_perm_t *who_perm = NULL;
4155 
4156                 assert('$' == name[2]);
4157 
4158                 if (nvpair_value_nvlist(nvp, &nvl2) != 0)
4159                         return (-1);
4160 
4161                 switch (perm_type) {
4162                 case ZFS_DELEG_CREATE:
4163                 case ZFS_DELEG_CREATE_SETS:
4164                 case ZFS_DELEG_NAMED_SET:
4165                 case ZFS_DELEG_NAMED_SET_SETS:
4166                         avl_pool = fspset->fsps_named_set_avl_pool;
4167                         avl = fsperm->fsp_sc_avl;
4168                         break;
4169                 case ZFS_DELEG_USER:
4170                 case ZFS_DELEG_USER_SETS:
4171                 case ZFS_DELEG_GROUP:
4172                 case ZFS_DELEG_GROUP_SETS:
4173                 case ZFS_DELEG_EVERYONE:
4174                 case ZFS_DELEG_EVERYONE_SETS:
4175                         avl_pool = fspset->fsps_who_perm_avl_pool;
4176                         avl = fsperm->fsp_uge_avl;
4177                         break;
4178                 }
4179 
4180                 if (is_set) {
4181                         who_perm_node_t *found_node = NULL;
4182                         who_perm_node_t *node = safe_malloc(
4183                             sizeof (who_perm_node_t));
4184                         who_perm = &node->who_perm;
4185                         uu_avl_index_t idx = 0;
4186 
4187                         uu_avl_node_init(node, &node->who_avl_node, avl_pool);
4188                         who_perm_init(who_perm, fsperm, perm_type, perm_name);
4189 
4190                         if ((found_node = uu_avl_find(avl, node, NULL, &idx))
4191                             == NULL) {
4192                                 if (avl == fsperm->fsp_uge_avl) {
4193                                         uid_t rid = 0;
4194                                         struct passwd *p = NULL;
4195                                         struct group *g = NULL;
4196                                         const char *nice_name = NULL;
4197 
4198                                         switch (perm_type) {
4199                                         case ZFS_DELEG_USER_SETS:
4200                                         case ZFS_DELEG_USER:
4201                                                 rid = atoi(perm_name);
4202                                                 p = getpwuid(rid);
4203                                                 if (p)
4204                                                         nice_name = p->pw_name;
4205                                                 break;
4206                                         case ZFS_DELEG_GROUP_SETS:
4207                                         case ZFS_DELEG_GROUP:
4208                                                 rid = atoi(perm_name);
4209                                                 g = getgrgid(rid);
4210                                                 if (g)
4211                                                         nice_name = g->gr_name;
4212                                                 break;
4213                                         }
4214 
4215                                         if (nice_name != NULL)
4216                                                 (void) strlcpy(
4217                                                     node->who_perm.who_ug_name,
4218                                                     nice_name, 256);
4219                                 }
4220 
4221                                 uu_avl_insert(avl, node, idx);
4222                         } else {
4223                                 node = found_node;
4224                                 who_perm = &node->who_perm;
4225                         }
4226                 }
4227 
4228                 (void) parse_who_perm(who_perm, nvl2, perm_locality);
4229         }
4230 
4231         return (0);
4232 }
4233 
4234 static inline int
4235 parse_fs_perm_set(fs_perm_set_t *fspset, nvlist_t *nvl)
4236 {
4237         nvpair_t *nvp = NULL;
4238         uu_avl_index_t idx = 0;
4239 
4240         while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
4241                 nvlist_t *nvl2 = NULL;
4242                 const char *fsname = nvpair_name(nvp);
4243                 data_type_t type = nvpair_type(nvp);
4244                 fs_perm_t *fsperm = NULL;
4245                 fs_perm_node_t *node = safe_malloc(sizeof (fs_perm_node_t));
4246                 if (node == NULL)
4247                         nomem();
4248 
4249                 fsperm = &node->fspn_fsperm;
4250 
4251                 assert(DATA_TYPE_NVLIST == type);
4252 
4253                 uu_list_node_init(node, &node->fspn_list_node,
4254                     fspset->fsps_list_pool);
4255 
4256                 idx = uu_list_numnodes(fspset->fsps_list);
4257                 fs_perm_init(fsperm, fspset, fsname);
4258 
4259                 if (nvpair_value_nvlist(nvp, &nvl2) != 0)
4260                         return (-1);
4261 
4262                 (void) parse_fs_perm(fsperm, nvl2);
4263 
4264                 uu_list_insert(fspset->fsps_list, node, idx);
4265         }
4266 
4267         return (0);
4268 }
4269 
4270 static inline const char *
4271 deleg_perm_comment(zfs_deleg_note_t note)
4272 {
4273         const char *str = "";
4274 
4275         /* subcommands */
4276         switch (note) {
4277                 /* SUBCOMMANDS */
4278         case ZFS_DELEG_NOTE_ALLOW:
4279                 str = gettext("Must also have the permission that is being"
4280                     "\n\t\t\t\tallowed");
4281                 break;
4282         case ZFS_DELEG_NOTE_CLONE:
4283                 str = gettext("Must also have the 'create' ability and 'mount'"
4284                     "\n\t\t\t\tability in the origin file system");
4285                 break;
4286         case ZFS_DELEG_NOTE_CREATE:
4287                 str = gettext("Must also have the 'mount' ability");
4288                 break;
4289         case ZFS_DELEG_NOTE_DESTROY:
4290                 str = gettext("Must also have the 'mount' ability");
4291                 break;
4292         case ZFS_DELEG_NOTE_DIFF:
4293                 str = gettext("Allows lookup of paths within a dataset;"
4294                     "\n\t\t\t\tgiven an object number. Ordinary users need this"
4295                     "\n\t\t\t\tin order to use zfs diff");
4296                 break;
4297         case ZFS_DELEG_NOTE_HOLD:
4298                 str = gettext("Allows adding a user hold to a snapshot");
4299                 break;
4300         case ZFS_DELEG_NOTE_MOUNT:
4301                 str = gettext("Allows mount/umount of ZFS datasets");
4302                 break;
4303         case ZFS_DELEG_NOTE_PROMOTE:
4304                 str = gettext("Must also have the 'mount'\n\t\t\t\tand"
4305                     " 'promote' ability in the origin file system");
4306                 break;
4307         case ZFS_DELEG_NOTE_RECEIVE:
4308                 str = gettext("Must also have the 'mount' and 'create'"
4309                     " ability");
4310                 break;
4311         case ZFS_DELEG_NOTE_RELEASE:
4312                 str = gettext("Allows releasing a user hold which\n\t\t\t\t"
4313                     "might destroy the snapshot");
4314                 break;
4315         case ZFS_DELEG_NOTE_RENAME:
4316                 str = gettext("Must also have the 'mount' and 'create'"
4317                     "\n\t\t\t\tability in the new parent");
4318                 break;
4319         case ZFS_DELEG_NOTE_ROLLBACK:
4320                 str = gettext("");
4321                 break;
4322         case ZFS_DELEG_NOTE_SEND:
4323                 str = gettext("");
4324                 break;
4325         case ZFS_DELEG_NOTE_SHARE:
4326                 str = gettext("Allows sharing file systems over NFS or SMB"
4327                     "\n\t\t\t\tprotocols");
4328                 break;
4329         case ZFS_DELEG_NOTE_SNAPSHOT:
4330                 str = gettext("");
4331                 break;
4332 /*
4333  *      case ZFS_DELEG_NOTE_VSCAN:
4334  *              str = gettext("");
4335  *              break;
4336  */
4337                 /* OTHER */
4338         case ZFS_DELEG_NOTE_GROUPQUOTA:
4339                 str = gettext("Allows accessing any groupquota@... property");
4340                 break;
4341         case ZFS_DELEG_NOTE_GROUPUSED:
4342                 str = gettext("Allows reading any groupused@... property");
4343                 break;
4344         case ZFS_DELEG_NOTE_USERPROP:
4345                 str = gettext("Allows changing any user property");
4346                 break;
4347         case ZFS_DELEG_NOTE_USERQUOTA:
4348                 str = gettext("Allows accessing any userquota@... property");
4349                 break;
4350         case ZFS_DELEG_NOTE_USERUSED:
4351                 str = gettext("Allows reading any userused@... property");
4352                 break;
4353                 /* other */
4354         default:
4355                 str = "";
4356         }
4357 
4358         return (str);
4359 }
4360 
4361 struct allow_opts {
4362         boolean_t local;
4363         boolean_t descend;
4364         boolean_t user;
4365         boolean_t group;
4366         boolean_t everyone;
4367         boolean_t create;
4368         boolean_t set;
4369         boolean_t recursive; /* unallow only */
4370         boolean_t prt_usage;
4371 
4372         boolean_t prt_perms;
4373         char *who;
4374         char *perms;
4375         const char *dataset;
4376 };
4377 
4378 static inline int
4379 prop_cmp(const void *a, const void *b)
4380 {
4381         const char *str1 = *(const char **)a;
4382         const char *str2 = *(const char **)b;
4383         return (strcmp(str1, str2));
4384 }
4385 
4386 static void
4387 allow_usage(boolean_t un, boolean_t requested, const char *msg)
4388 {
4389         const char *opt_desc[] = {
4390                 "-h", gettext("show this help message and exit"),
4391                 "-l", gettext("set permission locally"),
4392                 "-d", gettext("set permission for descents"),
4393                 "-u", gettext("set permission for user"),
4394                 "-g", gettext("set permission for group"),
4395                 "-e", gettext("set permission for everyone"),
4396                 "-c", gettext("set create time permission"),
4397                 "-s", gettext("define permission set"),
4398                 /* unallow only */
4399                 "-r", gettext("remove permissions recursively"),
4400         };
4401         size_t unallow_size = sizeof (opt_desc) / sizeof (char *);
4402         size_t allow_size = unallow_size - 2;
4403         const char *props[ZFS_NUM_PROPS];
4404         int i;
4405         size_t count = 0;
4406         FILE *fp = requested ? stdout : stderr;
4407         zprop_desc_t *pdtbl = zfs_prop_get_table();
4408         const char *fmt = gettext("%-16s %-14s\t%s\n");
4409 
4410         (void) fprintf(fp, gettext("Usage: %s\n"), get_usage(un ? HELP_UNALLOW :
4411             HELP_ALLOW));
4412         (void) fprintf(fp, gettext("Options:\n"));
4413         for (int i = 0; i < (un ? unallow_size : allow_size); i++) {
4414                 const char *opt = opt_desc[i++];
4415                 const char *optdsc = opt_desc[i];
4416                 (void) fprintf(fp, gettext("  %-10s  %s\n"), opt, optdsc);
4417         }
4418 
4419         (void) fprintf(fp, gettext("\nThe following permissions are "
4420             "supported:\n\n"));
4421         (void) fprintf(fp, fmt, gettext("NAME"), gettext("TYPE"),
4422             gettext("NOTES"));
4423         for (i = 0; i < ZFS_NUM_DELEG_NOTES; i++) {
4424                 const char *perm_name = zfs_deleg_perm_tbl[i].z_perm;
4425                 zfs_deleg_note_t perm_note = zfs_deleg_perm_tbl[i].z_note;
4426                 const char *perm_type = deleg_perm_type(perm_note);
4427                 const char *perm_comment = deleg_perm_comment(perm_note);
4428                 (void) fprintf(fp, fmt, perm_name, perm_type, perm_comment);
4429         }
4430 
4431         for (i = 0; i < ZFS_NUM_PROPS; i++) {
4432                 zprop_desc_t *pd = &pdtbl[i];
4433                 if (pd->pd_visible != B_TRUE)
4434                         continue;
4435 
4436                 if (pd->pd_attr == PROP_READONLY)
4437                         continue;
4438 
4439                 props[count++] = pd->pd_name;
4440         }
4441         props[count] = NULL;
4442 
4443         qsort(props, count, sizeof (char *), prop_cmp);
4444 
4445         for (i = 0; i < count; i++)
4446                 (void) fprintf(fp, fmt, props[i], gettext("property"), "");
4447 
4448         if (msg != NULL)
4449                 (void) fprintf(fp, gettext("\nzfs: error: %s"), msg);
4450 
4451         exit(requested ? 0 : 2);
4452 }
4453 
4454 static inline const char *
4455 munge_args(int argc, char **argv, boolean_t un, size_t expected_argc,
4456     char **permsp)
4457 {
4458         if (un && argc == expected_argc - 1)
4459                 *permsp = NULL;
4460         else if (argc == expected_argc)
4461                 *permsp = argv[argc - 2];
4462         else
4463                 allow_usage(un, B_FALSE,
4464                     gettext("wrong number of parameters\n"));
4465 
4466         return (argv[argc - 1]);
4467 }
4468 
4469 static void
4470 parse_allow_args(int argc, char **argv, boolean_t un, struct allow_opts *opts)
4471 {
4472         int uge_sum = opts->user + opts->group + opts->everyone;
4473         int csuge_sum = opts->create + opts->set + uge_sum;
4474         int ldcsuge_sum = csuge_sum + opts->local + opts->descend;
4475         int all_sum = un ? ldcsuge_sum + opts->recursive : ldcsuge_sum;
4476 
4477         if (uge_sum > 1)
4478                 allow_usage(un, B_FALSE,
4479                     gettext("-u, -g, and -e are mutually exclusive\n"));
4480 
4481         if (opts->prt_usage)
4482                 if (argc == 0 && all_sum == 0)
4483                         allow_usage(un, B_TRUE, NULL);
4484                 else
4485                         usage(B_FALSE);
4486 
4487         if (opts->set) {
4488                 if (csuge_sum > 1)
4489                         allow_usage(un, B_FALSE,
4490                             gettext("invalid options combined with -s\n"));
4491 
4492                 opts->dataset = munge_args(argc, argv, un, 3, &opts->perms);
4493                 if (argv[0][0] != '@')
4494                         allow_usage(un, B_FALSE,
4495                             gettext("invalid set name: missing '@' prefix\n"));
4496                 opts->who = argv[0];
4497         } else if (opts->create) {
4498                 if (ldcsuge_sum > 1)
4499                         allow_usage(un, B_FALSE,
4500                             gettext("invalid options combined with -c\n"));
4501                 opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
4502         } else if (opts->everyone) {
4503                 if (csuge_sum > 1)
4504                         allow_usage(un, B_FALSE,
4505                             gettext("invalid options combined with -e\n"));
4506                 opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
4507         } else if (uge_sum == 0 && argc > 0 && strcmp(argv[0], "everyone")
4508             == 0) {
4509                 opts->everyone = B_TRUE;
4510                 argc--;
4511                 argv++;
4512                 opts->dataset = munge_args(argc, argv, un, 2, &opts->perms);
4513         } else if (argc == 1 && !un) {
4514                 opts->prt_perms = B_TRUE;
4515                 opts->dataset = argv[argc-1];
4516         } else {
4517                 opts->dataset = munge_args(argc, argv, un, 3, &opts->perms);
4518                 opts->who = argv[0];
4519         }
4520 
4521         if (!opts->local && !opts->descend) {
4522                 opts->local = B_TRUE;
4523                 opts->descend = B_TRUE;
4524         }
4525 }
4526 
4527 static void
4528 store_allow_perm(zfs_deleg_who_type_t type, boolean_t local, boolean_t descend,
4529     const char *who, char *perms, nvlist_t *top_nvl)
4530 {
4531         int i;
4532         char ld[2] = { '\0', '\0' };
4533         char who_buf[ZFS_MAXNAMELEN+32];
4534         char base_type;
4535         char set_type;
4536         nvlist_t *base_nvl = NULL;
4537         nvlist_t *set_nvl = NULL;
4538         nvlist_t *nvl;
4539 
4540         if (nvlist_alloc(&base_nvl, NV_UNIQUE_NAME, 0) != 0)
4541                 nomem();
4542         if (nvlist_alloc(&set_nvl, NV_UNIQUE_NAME, 0) !=  0)
4543                 nomem();
4544 
4545         switch (type) {
4546         case ZFS_DELEG_NAMED_SET_SETS:
4547         case ZFS_DELEG_NAMED_SET:
4548                 set_type = ZFS_DELEG_NAMED_SET_SETS;
4549                 base_type = ZFS_DELEG_NAMED_SET;
4550                 ld[0] = ZFS_DELEG_NA;
4551                 break;
4552         case ZFS_DELEG_CREATE_SETS:
4553         case ZFS_DELEG_CREATE:
4554                 set_type = ZFS_DELEG_CREATE_SETS;
4555                 base_type = ZFS_DELEG_CREATE;
4556                 ld[0] = ZFS_DELEG_NA;
4557                 break;
4558         case ZFS_DELEG_USER_SETS:
4559         case ZFS_DELEG_USER:
4560                 set_type = ZFS_DELEG_USER_SETS;
4561                 base_type = ZFS_DELEG_USER;
4562                 if (local)
4563                         ld[0] = ZFS_DELEG_LOCAL;
4564                 if (descend)
4565                         ld[1] = ZFS_DELEG_DESCENDENT;
4566                 break;
4567         case ZFS_DELEG_GROUP_SETS:
4568         case ZFS_DELEG_GROUP:
4569                 set_type = ZFS_DELEG_GROUP_SETS;
4570                 base_type = ZFS_DELEG_GROUP;
4571                 if (local)
4572                         ld[0] = ZFS_DELEG_LOCAL;
4573                 if (descend)
4574                         ld[1] = ZFS_DELEG_DESCENDENT;
4575                 break;
4576         case ZFS_DELEG_EVERYONE_SETS:
4577         case ZFS_DELEG_EVERYONE:
4578                 set_type = ZFS_DELEG_EVERYONE_SETS;
4579                 base_type = ZFS_DELEG_EVERYONE;
4580                 if (local)
4581                         ld[0] = ZFS_DELEG_LOCAL;
4582                 if (descend)
4583                         ld[1] = ZFS_DELEG_DESCENDENT;
4584         }
4585 
4586         if (perms != NULL) {
4587                 char *curr = perms;
4588                 char *end = curr + strlen(perms);
4589 
4590                 while (curr < end) {
4591                         char *delim = strchr(curr, ',');
4592                         if (delim == NULL)
4593                                 delim = end;
4594                         else
4595                                 *delim = '\0';
4596 
4597                         if (curr[0] == '@')
4598                                 nvl = set_nvl;
4599                         else
4600                                 nvl = base_nvl;
4601 
4602                         (void) nvlist_add_boolean(nvl, curr);
4603                         if (delim != end)
4604                                 *delim = ',';
4605                         curr = delim + 1;
4606                 }
4607 
4608                 for (i = 0; i < 2; i++) {
4609                         char locality = ld[i];
4610                         if (locality == 0)
4611                                 continue;
4612 
4613                         if (!nvlist_empty(base_nvl)) {
4614                                 if (who != NULL)
4615                                         (void) snprintf(who_buf,
4616                                             sizeof (who_buf), "%c%c$%s",
4617                                             base_type, locality, who);
4618                                 else
4619                                         (void) snprintf(who_buf,
4620                                             sizeof (who_buf), "%c%c$",
4621                                             base_type, locality);
4622 
4623                                 (void) nvlist_add_nvlist(top_nvl, who_buf,
4624                                     base_nvl);
4625                         }
4626 
4627 
4628                         if (!nvlist_empty(set_nvl)) {
4629                                 if (who != NULL)
4630                                         (void) snprintf(who_buf,
4631                                             sizeof (who_buf), "%c%c$%s",
4632                                             set_type, locality, who);
4633                                 else
4634                                         (void) snprintf(who_buf,
4635                                             sizeof (who_buf), "%c%c$",
4636                                             set_type, locality);
4637 
4638                                 (void) nvlist_add_nvlist(top_nvl, who_buf,
4639                                     set_nvl);
4640                         }
4641                 }
4642         } else {
4643                 for (i = 0; i < 2; i++) {
4644                         char locality = ld[i];
4645                         if (locality == 0)
4646                                 continue;
4647 
4648                         if (who != NULL)
4649                                 (void) snprintf(who_buf, sizeof (who_buf),
4650                                     "%c%c$%s", base_type, locality, who);
4651                         else
4652                                 (void) snprintf(who_buf, sizeof (who_buf),
4653                                     "%c%c$", base_type, locality);
4654                         (void) nvlist_add_boolean(top_nvl, who_buf);
4655 
4656                         if (who != NULL)
4657                                 (void) snprintf(who_buf, sizeof (who_buf),
4658                                     "%c%c$%s", set_type, locality, who);
4659                         else
4660                                 (void) snprintf(who_buf, sizeof (who_buf),
4661                                     "%c%c$", set_type, locality);
4662                         (void) nvlist_add_boolean(top_nvl, who_buf);
4663                 }
4664         }
4665 }
4666 
4667 static int
4668 construct_fsacl_list(boolean_t un, struct allow_opts *opts, nvlist_t **nvlp)
4669 {
4670         if (nvlist_alloc(nvlp, NV_UNIQUE_NAME, 0) != 0)
4671                 nomem();
4672 
4673         if (opts->set) {
4674                 store_allow_perm(ZFS_DELEG_NAMED_SET, opts->local,
4675                     opts->descend, opts->who, opts->perms, *nvlp);
4676         } else if (opts->create) {
4677                 store_allow_perm(ZFS_DELEG_CREATE, opts->local,
4678                     opts->descend, NULL, opts->perms, *nvlp);
4679         } else if (opts->everyone) {
4680                 store_allow_perm(ZFS_DELEG_EVERYONE, opts->local,
4681                     opts->descend, NULL, opts->perms, *nvlp);
4682         } else {
4683                 char *curr = opts->who;
4684                 char *end = curr + strlen(curr);
4685 
4686                 while (curr < end) {
4687                         const char *who;
4688                         zfs_deleg_who_type_t who_type;
4689                         char *endch;
4690                         char *delim = strchr(curr, ',');
4691                         char errbuf[256];
4692                         char id[64];
4693                         struct passwd *p = NULL;
4694                         struct group *g = NULL;
4695 
4696                         uid_t rid;
4697                         if (delim == NULL)
4698                                 delim = end;
4699                         else
4700                                 *delim = '\0';
4701 
4702                         rid = (uid_t)strtol(curr, &endch, 0);
4703                         if (opts->user) {
4704                                 who_type = ZFS_DELEG_USER;
4705                                 if (*endch != '\0')
4706                                         p = getpwnam(curr);
4707                                 else
4708                                         p = getpwuid(rid);
4709 
4710                                 if (p != NULL)
4711                                         rid = p->pw_uid;
4712                                 else {
4713                                         (void) snprintf(errbuf, 256, gettext(
4714                                             "invalid user %s"), curr);
4715                                         allow_usage(un, B_TRUE, errbuf);
4716                                 }
4717                         } else if (opts->group) {
4718                                 who_type = ZFS_DELEG_GROUP;
4719                                 if (*endch != '\0')
4720                                         g = getgrnam(curr);
4721                                 else
4722                                         g = getgrgid(rid);
4723 
4724                                 if (g != NULL)
4725                                         rid = g->gr_gid;
4726                                 else {
4727                                         (void) snprintf(errbuf, 256, gettext(
4728                                             "invalid group %s"),  curr);
4729                                         allow_usage(un, B_TRUE, errbuf);
4730                                 }
4731                         } else {
4732                                 if (*endch != '\0') {
4733                                         p = getpwnam(curr);
4734                                 } else {
4735                                         p = getpwuid(rid);
4736                                 }
4737 
4738                                 if (p == NULL)
4739                                         if (*endch != '\0') {
4740                                                 g = getgrnam(curr);
4741                                         } else {
4742                                                 g = getgrgid(rid);
4743                                         }
4744 
4745                                 if (p != NULL) {
4746                                         who_type = ZFS_DELEG_USER;
4747                                         rid = p->pw_uid;
4748                                 } else if (g != NULL) {
4749                                         who_type = ZFS_DELEG_GROUP;
4750                                         rid = g->gr_gid;
4751                                 } else {
4752                                         (void) snprintf(errbuf, 256, gettext(
4753                                             "invalid user/group %s"), curr);
4754                                         allow_usage(un, B_TRUE, errbuf);
4755                                 }
4756                         }
4757 
4758                         (void) sprintf(id, "%u", rid);
4759                         who = id;
4760 
4761                         store_allow_perm(who_type, opts->local,
4762                             opts->descend, who, opts->perms, *nvlp);
4763                         curr = delim + 1;
4764                 }
4765         }
4766 
4767         return (0);
4768 }
4769 
4770 static void
4771 print_set_creat_perms(uu_avl_t *who_avl)
4772 {
4773         const char *sc_title[] = {
4774                 gettext("Permission sets:\n"),
4775                 gettext("Create time permissions:\n"),
4776                 NULL
4777         };
4778         const char **title_ptr = sc_title;
4779         who_perm_node_t *who_node = NULL;
4780         int prev_weight = -1;
4781 
4782         for (who_node = uu_avl_first(who_avl); who_node != NULL;
4783             who_node = uu_avl_next(who_avl, who_node)) {
4784                 uu_avl_t *avl = who_node->who_perm.who_deleg_perm_avl;
4785                 zfs_deleg_who_type_t who_type = who_node->who_perm.who_type;
4786                 const char *who_name = who_node->who_perm.who_name;
4787                 int weight = who_type2weight(who_type);
4788                 boolean_t first = B_TRUE;
4789                 deleg_perm_node_t *deleg_node;
4790 
4791                 if (prev_weight != weight) {
4792                         (void) printf(*title_ptr++);
4793                         prev_weight = weight;
4794                 }
4795 
4796                 if (who_name == NULL || strnlen(who_name, 1) == 0)
4797                         (void) printf("\t");
4798                 else
4799                         (void) printf("\t%s ", who_name);
4800 
4801                 for (deleg_node = uu_avl_first(avl); deleg_node != NULL;
4802                     deleg_node = uu_avl_next(avl, deleg_node)) {
4803                         if (first) {
4804                                 (void) printf("%s",
4805                                     deleg_node->dpn_perm.dp_name);
4806                                 first = B_FALSE;
4807                         } else
4808                                 (void) printf(",%s",
4809                                     deleg_node->dpn_perm.dp_name);
4810                 }
4811 
4812                 (void) printf("\n");
4813         }
4814 }
4815 
4816 static void inline
4817 print_uge_deleg_perms(uu_avl_t *who_avl, boolean_t local, boolean_t descend,
4818     const char *title)
4819 {
4820         who_perm_node_t *who_node = NULL;
4821         boolean_t prt_title = B_TRUE;
4822         uu_avl_walk_t *walk;
4823 
4824         if ((walk = uu_avl_walk_start(who_avl, UU_WALK_ROBUST)) == NULL)
4825                 nomem();
4826 
4827         while ((who_node = uu_avl_walk_next(walk)) != NULL) {
4828                 const char *who_name = who_node->who_perm.who_name;
4829                 const char *nice_who_name = who_node->who_perm.who_ug_name;
4830                 uu_avl_t *avl = who_node->who_perm.who_deleg_perm_avl;
4831                 zfs_deleg_who_type_t who_type = who_node->who_perm.who_type;
4832                 char delim = ' ';
4833                 deleg_perm_node_t *deleg_node;
4834                 boolean_t prt_who = B_TRUE;
4835 
4836                 for (deleg_node = uu_avl_first(avl);
4837                     deleg_node != NULL;
4838                     deleg_node = uu_avl_next(avl, deleg_node)) {
4839                         if (local != deleg_node->dpn_perm.dp_local ||
4840                             descend != deleg_node->dpn_perm.dp_descend)
4841                                 continue;
4842 
4843                         if (prt_who) {
4844                                 const char *who = NULL;
4845                                 if (prt_title) {
4846                                         prt_title = B_FALSE;
4847                                         (void) printf(title);
4848                                 }
4849 
4850                                 switch (who_type) {
4851                                 case ZFS_DELEG_USER_SETS:
4852                                 case ZFS_DELEG_USER:
4853                                         who = gettext("user");
4854                                         if (nice_who_name)
4855                                                 who_name  = nice_who_name;
4856                                         break;
4857                                 case ZFS_DELEG_GROUP_SETS:
4858                                 case ZFS_DELEG_GROUP:
4859                                         who = gettext("group");
4860                                         if (nice_who_name)
4861                                                 who_name  = nice_who_name;
4862                                         break;
4863                                 case ZFS_DELEG_EVERYONE_SETS:
4864                                 case ZFS_DELEG_EVERYONE:
4865                                         who = gettext("everyone");
4866                                         who_name = NULL;
4867                                 }
4868 
4869                                 prt_who = B_FALSE;
4870                                 if (who_name == NULL)
4871                                         (void) printf("\t%s", who);
4872                                 else
4873                                         (void) printf("\t%s %s", who, who_name);
4874                         }
4875 
4876                         (void) printf("%c%s", delim,
4877                             deleg_node->dpn_perm.dp_name);
4878                         delim = ',';
4879                 }
4880 
4881                 if (!prt_who)
4882                         (void) printf("\n");
4883         }
4884 
4885         uu_avl_walk_end(walk);
4886 }
4887 
4888 static void
4889 print_fs_perms(fs_perm_set_t *fspset)
4890 {
4891         fs_perm_node_t *node = NULL;
4892         char buf[ZFS_MAXNAMELEN+32];
4893         const char *dsname = buf;
4894 
4895         for (node = uu_list_first(fspset->fsps_list); node != NULL;
4896             node = uu_list_next(fspset->fsps_list, node)) {
4897                 uu_avl_t *sc_avl = node->fspn_fsperm.fsp_sc_avl;
4898                 uu_avl_t *uge_avl = node->fspn_fsperm.fsp_uge_avl;
4899                 int left = 0;
4900 
4901                 (void) snprintf(buf, ZFS_MAXNAMELEN+32,
4902                     gettext("---- Permissions on %s "),
4903                     node->fspn_fsperm.fsp_name);
4904                 (void) printf(dsname);
4905                 left = 70 - strlen(buf);
4906                 while (left-- > 0)
4907                         (void) printf("-");
4908                 (void) printf("\n");
4909 
4910                 print_set_creat_perms(sc_avl);
4911                 print_uge_deleg_perms(uge_avl, B_TRUE, B_FALSE,
4912                     gettext("Local permissions:\n"));
4913                 print_uge_deleg_perms(uge_avl, B_FALSE, B_TRUE,
4914                     gettext("Descendent permissions:\n"));
4915                 print_uge_deleg_perms(uge_avl, B_TRUE, B_TRUE,
4916                     gettext("Local+Descendent permissions:\n"));
4917         }
4918 }
4919 
4920 static fs_perm_set_t fs_perm_set = { NULL, NULL, NULL, NULL };
4921 
4922 struct deleg_perms {
4923         boolean_t un;
4924         nvlist_t *nvl;
4925 };
4926 
4927 static int
4928 set_deleg_perms(zfs_handle_t *zhp, void *data)
4929 {
4930         struct deleg_perms *perms = (struct deleg_perms *)data;
4931         zfs_type_t zfs_type = zfs_get_type(zhp);
4932 
4933         if (zfs_type != ZFS_TYPE_FILESYSTEM && zfs_type != ZFS_TYPE_VOLUME)
4934                 return (0);
4935 
4936         return (zfs_set_fsacl(zhp, perms->un, perms->nvl));
4937 }
4938 
4939 static int
4940 zfs_do_allow_unallow_impl(int argc, char **argv, boolean_t un)
4941 {
4942         zfs_handle_t *zhp;
4943         nvlist_t *perm_nvl = NULL;
4944         nvlist_t *update_perm_nvl = NULL;
4945         int error = 1;
4946         int c;
4947         struct allow_opts opts = { 0 };
4948 
4949         const char *optstr = un ? "ldugecsrh" : "ldugecsh";
4950 
4951         /* check opts */
4952         while ((c = getopt(argc, argv, optstr)) != -1) {
4953                 switch (c) {
4954                 case 'l':
4955                         opts.local = B_TRUE;
4956                         break;
4957                 case 'd':
4958                         opts.descend = B_TRUE;
4959                         break;
4960                 case 'u':
4961                         opts.user = B_TRUE;
4962                         break;
4963                 case 'g':
4964                         opts.group = B_TRUE;
4965                         break;
4966                 case 'e':
4967                         opts.everyone = B_TRUE;
4968                         break;
4969                 case 's':
4970                         opts.set = B_TRUE;
4971                         break;
4972                 case 'c':
4973                         opts.create = B_TRUE;
4974                         break;
4975                 case 'r':
4976                         opts.recursive = B_TRUE;
4977                         break;
4978                 case ':':
4979                         (void) fprintf(stderr, gettext("missing argument for "
4980                             "'%c' option\n"), optopt);
4981                         usage(B_FALSE);
4982                         break;
4983                 case 'h':
4984                         opts.prt_usage = B_TRUE;
4985                         break;
4986                 case '?':
4987                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
4988                             optopt);
4989                         usage(B_FALSE);
4990                 }
4991         }
4992 
4993         argc -= optind;
4994         argv += optind;
4995 
4996         /* check arguments */
4997         parse_allow_args(argc, argv, un, &opts);
4998 
4999         /* try to open the dataset */
5000         if ((zhp = zfs_open(g_zfs, opts.dataset, ZFS_TYPE_FILESYSTEM |
5001             ZFS_TYPE_VOLUME)) == NULL) {
5002                 (void) fprintf(stderr, "Failed to open dataset: %s\n",
5003                     opts.dataset);
5004                 return (-1);
5005         }
5006 
5007         if (zfs_get_fsacl(zhp, &perm_nvl) != 0)
5008                 goto cleanup2;
5009 
5010         fs_perm_set_init(&fs_perm_set);
5011         if (parse_fs_perm_set(&fs_perm_set, perm_nvl) != 0) {
5012                 (void) fprintf(stderr, "Failed to parse fsacl permissions\n");
5013                 goto cleanup1;
5014         }
5015 
5016         if (opts.prt_perms)
5017                 print_fs_perms(&fs_perm_set);
5018         else {
5019                 (void) construct_fsacl_list(un, &opts, &update_perm_nvl);
5020                 if (zfs_set_fsacl(zhp, un, update_perm_nvl) != 0)
5021                         goto cleanup0;
5022 
5023                 if (un && opts.recursive) {
5024                         struct deleg_perms data = { un, update_perm_nvl };
5025                         if (zfs_iter_filesystems(zhp, set_deleg_perms,
5026                             &data) != 0)
5027                                 goto cleanup0;
5028                 }
5029         }
5030 
5031         error = 0;
5032 
5033 cleanup0:
5034         nvlist_free(perm_nvl);
5035         if (update_perm_nvl != NULL)
5036                 nvlist_free(update_perm_nvl);
5037 cleanup1:
5038         fs_perm_set_fini(&fs_perm_set);
5039 cleanup2:
5040         zfs_close(zhp);
5041 
5042         return (error);
5043 }
5044 
5045 /*
5046  * zfs allow [-r] [-t] <tag> <snap> ...
5047  *
5048  *      -r      Recursively hold
5049  *      -t      Temporary hold (hidden option)
5050  *
5051  * Apply a user-hold with the given tag to the list of snapshots.
5052  */
5053 static int
5054 zfs_do_allow(int argc, char **argv)
5055 {
5056         return (zfs_do_allow_unallow_impl(argc, argv, B_FALSE));
5057 }
5058 
5059 /*
5060  * zfs unallow [-r] [-t] <tag> <snap> ...
5061  *
5062  *      -r      Recursively hold
5063  *      -t      Temporary hold (hidden option)
5064  *
5065  * Apply a user-hold with the given tag to the list of snapshots.
5066  */
5067 static int
5068 zfs_do_unallow(int argc, char **argv)
5069 {
5070         return (zfs_do_allow_unallow_impl(argc, argv, B_TRUE));
5071 }
5072 
5073 static int
5074 zfs_do_hold_rele_impl(int argc, char **argv, boolean_t holding)
5075 {
5076         int errors = 0;
5077         int i;
5078         const char *tag;
5079         boolean_t recursive = B_FALSE;
5080         boolean_t temphold = B_FALSE;
5081         const char *opts = holding ? "rt" : "r";
5082         int c;
5083 
5084         /* check options */
5085         while ((c = getopt(argc, argv, opts)) != -1) {
5086                 switch (c) {
5087                 case 'r':
5088                         recursive = B_TRUE;
5089                         break;
5090                 case 't':
5091                         temphold = B_TRUE;
5092                         break;
5093                 case '?':
5094                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
5095                             optopt);
5096                         usage(B_FALSE);
5097                 }
5098         }
5099 
5100         argc -= optind;
5101         argv += optind;
5102 
5103         /* check number of arguments */
5104         if (argc < 2)
5105                 usage(B_FALSE);
5106 
5107         tag = argv[0];
5108         --argc;
5109         ++argv;
5110 
5111         if (holding && tag[0] == '.') {
5112                 /* tags starting with '.' are reserved for libzfs */
5113                 (void) fprintf(stderr, gettext("tag may not start with '.'\n"));
5114                 usage(B_FALSE);
5115         }
5116 
5117         for (i = 0; i < argc; ++i) {
5118                 zfs_handle_t *zhp;
5119                 char parent[ZFS_MAXNAMELEN];
5120                 const char *delim;
5121                 char *path = argv[i];
5122 
5123                 delim = strchr(path, '@');
5124                 if (delim == NULL) {
5125                         (void) fprintf(stderr,
5126                             gettext("'%s' is not a snapshot\n"), path);
5127                         ++errors;
5128                         continue;
5129                 }
5130                 (void) strncpy(parent, path, delim - path);
5131                 parent[delim - path] = '\0';
5132 
5133                 zhp = zfs_open(g_zfs, parent,
5134                     ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
5135                 if (zhp == NULL) {
5136                         ++errors;
5137                         continue;
5138                 }
5139                 if (holding) {
5140                         if (zfs_hold(zhp, delim+1, tag, recursive,
5141                             temphold, B_FALSE, -1, 0, 0) != 0)
5142                                 ++errors;
5143                 } else {
5144                         if (zfs_release(zhp, delim+1, tag, recursive) != 0)
5145                                 ++errors;
5146                 }
5147                 zfs_close(zhp);
5148         }
5149 
5150         return (errors != 0);
5151 }
5152 
5153 /*
5154  * zfs hold [-r] [-t] <tag> <snap> ...
5155  *
5156  *      -r      Recursively hold
5157  *      -t      Temporary hold (hidden option)
5158  *
5159  * Apply a user-hold with the given tag to the list of snapshots.
5160  */
5161 static int
5162 zfs_do_hold(int argc, char **argv)
5163 {
5164         return (zfs_do_hold_rele_impl(argc, argv, B_TRUE));
5165 }
5166 
5167 /*
5168  * zfs release [-r] <tag> <snap> ...
5169  *
5170  *      -r      Recursively release
5171  *
5172  * Release a user-hold with the given tag from the list of snapshots.
5173  */
5174 static int
5175 zfs_do_release(int argc, char **argv)
5176 {
5177         return (zfs_do_hold_rele_impl(argc, argv, B_FALSE));
5178 }
5179 
5180 typedef struct holds_cbdata {
5181         boolean_t       cb_recursive;
5182         const char      *cb_snapname;
5183         nvlist_t        **cb_nvlp;
5184         size_t          cb_max_namelen;
5185         size_t          cb_max_taglen;
5186 } holds_cbdata_t;
5187 
5188 #define STRFTIME_FMT_STR "%a %b %e %k:%M %Y"
5189 #define DATETIME_BUF_LEN (32)
5190 /*
5191  *
5192  */
5193 static void
5194 print_holds(boolean_t scripted, size_t nwidth, size_t tagwidth, nvlist_t *nvl)
5195 {
5196         int i;
5197         nvpair_t *nvp = NULL;
5198         char *hdr_cols[] = { "NAME", "TAG", "TIMESTAMP" };
5199         const char *col;
5200 
5201         if (!scripted) {
5202                 for (i = 0; i < 3; i++) {
5203                         col = gettext(hdr_cols[i]);
5204                         if (i < 2)
5205                                 (void) printf("%-*s  ", i ? tagwidth : nwidth,
5206                                     col);
5207                         else
5208                                 (void) printf("%s\n", col);
5209                 }
5210         }
5211 
5212         while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
5213                 char *zname = nvpair_name(nvp);
5214                 nvlist_t *nvl2;
5215                 nvpair_t *nvp2 = NULL;
5216                 (void) nvpair_value_nvlist(nvp, &nvl2);
5217                 while ((nvp2 = nvlist_next_nvpair(nvl2, nvp2)) != NULL) {
5218                         char tsbuf[DATETIME_BUF_LEN];
5219                         char *tagname = nvpair_name(nvp2);
5220                         uint64_t val = 0;
5221                         time_t time;
5222                         struct tm t;
5223                         char sep = scripted ? '\t' : ' ';
5224                         size_t sepnum = scripted ? 1 : 2;
5225 
5226                         (void) nvpair_value_uint64(nvp2, &val);
5227                         time = (time_t)val;
5228                         (void) localtime_r(&time, &t);
5229                         (void) strftime(tsbuf, DATETIME_BUF_LEN,
5230                             gettext(STRFTIME_FMT_STR), &t);
5231 
5232                         (void) printf("%-*s%*c%-*s%*c%s\n", nwidth, zname,
5233                             sepnum, sep, tagwidth, tagname, sepnum, sep, tsbuf);
5234                 }
5235         }
5236 }
5237 
5238 /*
5239  * Generic callback function to list a dataset or snapshot.
5240  */
5241 static int
5242 holds_callback(zfs_handle_t *zhp, void *data)
5243 {
5244         holds_cbdata_t *cbp = data;
5245         nvlist_t *top_nvl = *cbp->cb_nvlp;
5246         nvlist_t *nvl = NULL;
5247         nvpair_t *nvp = NULL;
5248         const char *zname = zfs_get_name(zhp);
5249         size_t znamelen = strnlen(zname, ZFS_MAXNAMELEN);
5250 
5251         if (cbp->cb_recursive) {
5252                 const char *snapname;
5253                 char *delim  = strchr(zname, '@');
5254                 if (delim == NULL)
5255                         return (0);
5256 
5257                 snapname = delim + 1;
5258                 if (strcmp(cbp->cb_snapname, snapname))
5259                         return (0);
5260         }
5261 
5262         if (zfs_get_holds(zhp, &nvl) != 0)
5263                 return (-1);
5264 
5265         if (znamelen > cbp->cb_max_namelen)
5266                 cbp->cb_max_namelen  = znamelen;
5267 
5268         while ((nvp = nvlist_next_nvpair(nvl, nvp)) != NULL) {
5269                 const char *tag = nvpair_name(nvp);
5270                 size_t taglen = strnlen(tag, MAXNAMELEN);
5271                 if (taglen > cbp->cb_max_taglen)
5272                         cbp->cb_max_taglen  = taglen;
5273         }
5274 
5275         return (nvlist_add_nvlist(top_nvl, zname, nvl));
5276 }
5277 
5278 /*
5279  * zfs holds [-r] <snap> ...
5280  *
5281  *      -r      Recursively hold
5282  */
5283 static int
5284 zfs_do_holds(int argc, char **argv)
5285 {
5286         int errors = 0;
5287         int c;
5288         int i;
5289         boolean_t scripted = B_FALSE;
5290         boolean_t recursive = B_FALSE;
5291         const char *opts = "rH";
5292         nvlist_t *nvl;
5293 
5294         int types = ZFS_TYPE_SNAPSHOT;
5295         holds_cbdata_t cb = { 0 };
5296 
5297         int limit = 0;
5298         int ret = 0;
5299         int flags = 0;
5300 
5301         /* check options */
5302         while ((c = getopt(argc, argv, opts)) != -1) {
5303                 switch (c) {
5304                 case 'r':
5305                         recursive = B_TRUE;
5306                         break;
5307                 case 'H':
5308                         scripted = B_TRUE;
5309                         break;
5310                 case '?':
5311                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
5312                             optopt);
5313                         usage(B_FALSE);
5314                 }
5315         }
5316 
5317         if (recursive) {
5318                 types |= ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME;
5319                 flags |= ZFS_ITER_RECURSE;
5320         }
5321 
5322         argc -= optind;
5323         argv += optind;
5324 
5325         /* check number of arguments */
5326         if (argc < 1)
5327                 usage(B_FALSE);
5328 
5329         if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
5330                 nomem();
5331 
5332         for (i = 0; i < argc; ++i) {
5333                 char *snapshot = argv[i];
5334                 const char *delim;
5335                 const char *snapname;
5336 
5337                 delim = strchr(snapshot, '@');
5338                 if (delim == NULL) {
5339                         (void) fprintf(stderr,
5340                             gettext("'%s' is not a snapshot\n"), snapshot);
5341                         ++errors;
5342                         continue;
5343                 }
5344                 snapname = delim + 1;
5345                 if (recursive)
5346                         snapshot[delim - snapshot] = '\0';
5347 
5348                 cb.cb_recursive = recursive;
5349                 cb.cb_snapname = snapname;
5350                 cb.cb_nvlp = &nvl;
5351 
5352                 /*
5353                  *  1. collect holds data, set format options
5354                  */
5355                 ret = zfs_for_each(argc, argv, flags, types, NULL, NULL, limit,
5356                     holds_callback, &cb);
5357                 if (ret != 0)
5358                         ++errors;
5359         }
5360 
5361         /*
5362          *  2. print holds data
5363          */
5364         print_holds(scripted, cb.cb_max_namelen, cb.cb_max_taglen, nvl);
5365 
5366         if (nvlist_empty(nvl))
5367                 (void) printf(gettext("no datasets available\n"));
5368 
5369         nvlist_free(nvl);
5370 
5371         return (0 != errors);
5372 }
5373 
5374 #define CHECK_SPINNER 30
5375 #define SPINNER_TIME 3          /* seconds */
5376 #define MOUNT_TIME 5            /* seconds */
5377 
5378 static int
5379 get_one_dataset(zfs_handle_t *zhp, void *data)
5380 {
5381         static char *spin[] = { "-", "\\", "|", "/" };
5382         static int spinval = 0;
5383         static int spincheck = 0;
5384         static time_t last_spin_time = (time_t)0;
5385         get_all_cb_t *cbp = data;
5386         zfs_type_t type = zfs_get_type(zhp);
5387 
5388         if (cbp->cb_verbose) {
5389                 if (--spincheck < 0) {
5390                         time_t now = time(NULL);
5391                         if (last_spin_time + SPINNER_TIME < now) {
5392                                 update_progress(spin[spinval++ % 4]);
5393                                 last_spin_time = now;
5394                         }
5395                         spincheck = CHECK_SPINNER;
5396                 }
5397         }
5398 
5399         /*
5400          * Interate over any nested datasets.
5401          */
5402         if (zfs_iter_filesystems(zhp, get_one_dataset, data) != 0) {
5403                 zfs_close(zhp);
5404                 return (1);
5405         }
5406 
5407         /*
5408          * Skip any datasets whose type does not match.
5409          */
5410         if ((type & ZFS_TYPE_FILESYSTEM) == 0) {
5411                 zfs_close(zhp);
5412                 return (0);
5413         }
5414         libzfs_add_handle(cbp, zhp);
5415         assert(cbp->cb_used <= cbp->cb_alloc);
5416 
5417         return (0);
5418 }
5419 
5420 static void
5421 get_all_datasets(zfs_handle_t ***dslist, size_t *count, boolean_t verbose)
5422 {
5423         get_all_cb_t cb = { 0 };
5424         cb.cb_verbose = verbose;
5425         cb.cb_getone = get_one_dataset;
5426 
5427         if (verbose)
5428                 set_progress_header(gettext("Reading ZFS config"));
5429         (void) zfs_iter_root(g_zfs, get_one_dataset, &cb);
5430 
5431         *dslist = cb.cb_handles;
5432         *count = cb.cb_used;
5433 
5434         if (verbose)
5435                 finish_progress(gettext("done."));
5436 }
5437 
5438 /*
5439  * Generic callback for sharing or mounting filesystems.  Because the code is so
5440  * similar, we have a common function with an extra parameter to determine which
5441  * mode we are using.
5442  */
5443 #define OP_SHARE        0x1
5444 #define OP_MOUNT        0x2
5445 
5446 /*
5447  * Share or mount a dataset.
5448  */
5449 static int
5450 share_mount_one(zfs_handle_t *zhp, int op, int flags, char *protocol,
5451     boolean_t explicit, const char *options)
5452 {
5453         char mountpoint[ZFS_MAXPROPLEN];
5454         char shareopts[ZFS_MAXPROPLEN];
5455         char smbshareopts[ZFS_MAXPROPLEN];
5456         const char *cmdname = op == OP_SHARE ? "share" : "mount";
5457         struct mnttab mnt;
5458         uint64_t zoned, canmount;
5459         boolean_t shared_nfs, shared_smb;
5460 
5461         assert(zfs_get_type(zhp) & ZFS_TYPE_FILESYSTEM);
5462 
5463         /*
5464          * Check to make sure we can mount/share this dataset.  If we
5465          * are in the global zone and the filesystem is exported to a
5466          * local zone, or if we are in a local zone and the
5467          * filesystem is not exported, then it is an error.
5468          */
5469         zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
5470 
5471         if (zoned && getzoneid() == GLOBAL_ZONEID) {
5472                 if (!explicit)
5473                         return (0);
5474 
5475                 (void) fprintf(stderr, gettext("cannot %s '%s': "
5476                     "dataset is exported to a local zone\n"), cmdname,
5477                     zfs_get_name(zhp));
5478                 return (1);
5479 
5480         } else if (!zoned && getzoneid() != GLOBAL_ZONEID) {
5481                 if (!explicit)
5482                         return (0);
5483 
5484                 (void) fprintf(stderr, gettext("cannot %s '%s': "
5485                     "permission denied\n"), cmdname,
5486                     zfs_get_name(zhp));
5487                 return (1);
5488         }
5489 
5490         /*
5491          * Ignore any filesystems which don't apply to us. This
5492          * includes those with a legacy mountpoint, or those with
5493          * legacy share options.
5494          */
5495         verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
5496             sizeof (mountpoint), NULL, NULL, 0, B_FALSE) == 0);
5497         verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, shareopts,
5498             sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0);
5499         verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshareopts,
5500             sizeof (smbshareopts), NULL, NULL, 0, B_FALSE) == 0);
5501 
5502         if (op == OP_SHARE && strcmp(shareopts, "off") == 0 &&
5503             strcmp(smbshareopts, "off") == 0) {
5504                 if (!explicit)
5505                         return (0);
5506 
5507                 (void) fprintf(stderr, gettext("cannot share '%s': "
5508                     "legacy share\n"), zfs_get_name(zhp));
5509                 (void) fprintf(stderr, gettext("use share(1M) to "
5510                     "share this filesystem, or set "
5511                     "sharenfs property on\n"));
5512                 return (1);
5513         }
5514 
5515         /*
5516          * We cannot share or mount legacy filesystems. If the
5517          * shareopts is non-legacy but the mountpoint is legacy, we
5518          * treat it as a legacy share.
5519          */
5520         if (strcmp(mountpoint, "legacy") == 0) {
5521                 if (!explicit)
5522                         return (0);
5523 
5524                 (void) fprintf(stderr, gettext("cannot %s '%s': "
5525                     "legacy mountpoint\n"), cmdname, zfs_get_name(zhp));
5526                 (void) fprintf(stderr, gettext("use %s(1M) to "
5527                     "%s this filesystem\n"), cmdname, cmdname);
5528                 return (1);
5529         }
5530 
5531         if (strcmp(mountpoint, "none") == 0) {
5532                 if (!explicit)
5533                         return (0);
5534 
5535                 (void) fprintf(stderr, gettext("cannot %s '%s': no "
5536                     "mountpoint set\n"), cmdname, zfs_get_name(zhp));
5537                 return (1);
5538         }
5539 
5540         /*
5541          * canmount     explicit        outcome
5542          * on           no              pass through
5543          * on           yes             pass through
5544          * off          no              return 0
5545          * off          yes             display error, return 1
5546          * noauto       no              return 0
5547          * noauto       yes             pass through
5548          */
5549         canmount = zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT);
5550         if (canmount == ZFS_CANMOUNT_OFF) {
5551                 if (!explicit)
5552                         return (0);
5553 
5554                 (void) fprintf(stderr, gettext("cannot %s '%s': "
5555                     "'canmount' property is set to 'off'\n"), cmdname,
5556                     zfs_get_name(zhp));
5557                 return (1);
5558         } else if (canmount == ZFS_CANMOUNT_NOAUTO && !explicit) {
5559                 return (0);
5560         }
5561 
5562         /*
5563          * At this point, we have verified that the mountpoint and/or
5564          * shareopts are appropriate for auto management. If the
5565          * filesystem is already mounted or shared, return (failing
5566          * for explicit requests); otherwise mount or share the
5567          * filesystem.
5568          */
5569         switch (op) {
5570         case OP_SHARE:
5571 
5572                 shared_nfs = zfs_is_shared_nfs(zhp, NULL);
5573                 shared_smb = zfs_is_shared_smb(zhp, NULL);
5574 
5575                 if (shared_nfs && shared_smb ||
5576                     (shared_nfs && strcmp(shareopts, "on") == 0 &&
5577                     strcmp(smbshareopts, "off") == 0) ||
5578                     (shared_smb && strcmp(smbshareopts, "on") == 0 &&
5579                     strcmp(shareopts, "off") == 0)) {
5580                         if (!explicit)
5581                                 return (0);
5582 
5583                         (void) fprintf(stderr, gettext("cannot share "
5584                             "'%s': filesystem already shared\n"),
5585                             zfs_get_name(zhp));
5586                         return (1);
5587                 }
5588 
5589                 if (!zfs_is_mounted(zhp, NULL) &&
5590                     zfs_mount(zhp, NULL, 0) != 0)
5591                         return (1);
5592 
5593                 if (protocol == NULL) {
5594                         if (zfs_shareall(zhp) != 0)
5595                                 return (1);
5596                 } else if (strcmp(protocol, "nfs") == 0) {
5597                         if (zfs_share_nfs(zhp))
5598                                 return (1);
5599                 } else if (strcmp(protocol, "smb") == 0) {
5600                         if (zfs_share_smb(zhp))
5601                                 return (1);
5602                 } else {
5603                         (void) fprintf(stderr, gettext("cannot share "
5604                             "'%s': invalid share type '%s' "
5605                             "specified\n"),
5606                             zfs_get_name(zhp), protocol);
5607                         return (1);
5608                 }
5609 
5610                 break;
5611 
5612         case OP_MOUNT:
5613                 if (options == NULL)
5614                         mnt.mnt_mntopts = "";
5615                 else
5616                         mnt.mnt_mntopts = (char *)options;
5617 
5618                 if (!hasmntopt(&mnt, MNTOPT_REMOUNT) &&
5619                     zfs_is_mounted(zhp, NULL)) {
5620                         if (!explicit)
5621                                 return (0);
5622 
5623                         (void) fprintf(stderr, gettext("cannot mount "
5624                             "'%s': filesystem already mounted\n"),
5625                             zfs_get_name(zhp));
5626                         return (1);
5627                 }
5628 
5629                 if (zfs_mount(zhp, options, flags) != 0)
5630                         return (1);
5631                 break;
5632         }
5633 
5634         return (0);
5635 }
5636 
5637 /*
5638  * Reports progress in the form "(current/total)".  Not thread-safe.
5639  */
5640 static void
5641 report_mount_progress(int current, int total)
5642 {
5643         static time_t last_progress_time = 0;
5644         time_t now = time(NULL);
5645         char info[32];
5646 
5647         /* report 1..n instead of 0..n-1 */
5648         ++current;
5649 
5650         /* display header if we're here for the first time */
5651         if (current == 1) {
5652                 set_progress_header(gettext("Mounting ZFS filesystems"));
5653         } else if (current != total && last_progress_time + MOUNT_TIME >= now) {
5654                 /* too soon to report again */
5655                 return;
5656         }
5657 
5658         last_progress_time = now;
5659 
5660         (void) sprintf(info, "(%d/%d)", current, total);
5661 
5662         if (current == total)
5663                 finish_progress(info);
5664         else
5665                 update_progress(info);
5666 }
5667 
5668 static void
5669 append_options(char *mntopts, char *newopts)
5670 {
5671         int len = strlen(mntopts);
5672 
5673         /* original length plus new string to append plus 1 for the comma */
5674         if (len + 1 + strlen(newopts) >= MNT_LINE_MAX) {
5675                 (void) fprintf(stderr, gettext("the opts argument for "
5676                     "'%c' option is too long (more than %d chars)\n"),
5677                     "-o", MNT_LINE_MAX);
5678                 usage(B_FALSE);
5679         }
5680 
5681         if (*mntopts)
5682                 mntopts[len++] = ',';
5683 
5684         (void) strcpy(&mntopts[len], newopts);
5685 }
5686 
5687 static int
5688 share_mount(int op, int argc, char **argv)
5689 {
5690         int do_all = 0;
5691         boolean_t verbose = B_FALSE;
5692         int c, ret = 0;
5693         char *options = NULL;
5694         int flags = 0;
5695 
5696         /* check options */
5697         while ((c = getopt(argc, argv, op == OP_MOUNT ? ":avo:O" : "a"))
5698             != -1) {
5699                 switch (c) {
5700                 case 'a':
5701                         do_all = 1;
5702                         break;
5703                 case 'v':
5704                         verbose = B_TRUE;
5705                         break;
5706                 case 'o':
5707                         if (*optarg == '\0') {
5708                                 (void) fprintf(stderr, gettext("empty mount "
5709                                     "options (-o) specified\n"));
5710                                 usage(B_FALSE);
5711                         }
5712 
5713                         if (options == NULL)
5714                                 options = safe_malloc(MNT_LINE_MAX + 1);
5715 
5716                         /* option validation is done later */
5717                         append_options(options, optarg);
5718                         break;
5719 
5720                 case 'O':
5721                         flags |= MS_OVERLAY;
5722                         break;
5723                 case ':':
5724                         (void) fprintf(stderr, gettext("missing argument for "
5725                             "'%c' option\n"), optopt);
5726                         usage(B_FALSE);
5727                         break;
5728                 case '?':
5729                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
5730                             optopt);
5731                         usage(B_FALSE);
5732                 }
5733         }
5734 
5735         argc -= optind;
5736         argv += optind;
5737 
5738         /* check number of arguments */
5739         if (do_all) {
5740                 zfs_handle_t **dslist = NULL;
5741                 size_t i, count = 0;
5742                 char *protocol = NULL;
5743 
5744                 if (op == OP_SHARE && argc > 0) {
5745                         if (strcmp(argv[0], "nfs") != 0 &&
5746                             strcmp(argv[0], "smb") != 0) {
5747                                 (void) fprintf(stderr, gettext("share type "
5748                                     "must be 'nfs' or 'smb'\n"));
5749                                 usage(B_FALSE);
5750                         }
5751                         protocol = argv[0];
5752                         argc--;
5753                         argv++;
5754                 }
5755 
5756                 if (argc != 0) {
5757                         (void) fprintf(stderr, gettext("too many arguments\n"));
5758                         usage(B_FALSE);
5759                 }
5760 
5761                 start_progress_timer();
5762                 get_all_datasets(&dslist, &count, verbose);
5763 
5764                 if (count == 0)
5765                         return (0);
5766 
5767                 qsort(dslist, count, sizeof (void *), libzfs_dataset_cmp);
5768 
5769                 for (i = 0; i < count; i++) {
5770                         if (verbose)
5771                                 report_mount_progress(i, count);
5772 
5773                         if (share_mount_one(dslist[i], op, flags, protocol,
5774                             B_FALSE, options) != 0)
5775                                 ret = 1;
5776                         zfs_close(dslist[i]);
5777                 }
5778 
5779                 free(dslist);
5780         } else if (argc == 0) {
5781                 struct mnttab entry;
5782 
5783                 if ((op == OP_SHARE) || (options != NULL)) {
5784                         (void) fprintf(stderr, gettext("missing filesystem "
5785                             "argument (specify -a for all)\n"));
5786                         usage(B_FALSE);
5787                 }
5788 
5789                 /*
5790                  * When mount is given no arguments, go through /etc/mnttab and
5791                  * display any active ZFS mounts.  We hide any snapshots, since
5792                  * they are controlled automatically.
5793                  */
5794                 rewind(mnttab_file);
5795                 while (getmntent(mnttab_file, &entry) == 0) {
5796                         if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0 ||
5797                             strchr(entry.mnt_special, '@') != NULL)
5798                                 continue;
5799 
5800                         (void) printf("%-30s  %s\n", entry.mnt_special,
5801                             entry.mnt_mountp);
5802                 }
5803 
5804         } else {
5805                 zfs_handle_t *zhp;
5806 
5807                 if (argc > 1) {
5808                         (void) fprintf(stderr,
5809                             gettext("too many arguments\n"));
5810                         usage(B_FALSE);
5811                 }
5812 
5813                 if ((zhp = zfs_open(g_zfs, argv[0],
5814                     ZFS_TYPE_FILESYSTEM)) == NULL) {
5815                         ret = 1;
5816                 } else {
5817                         ret = share_mount_one(zhp, op, flags, NULL, B_TRUE,
5818                             options);
5819                         zfs_close(zhp);
5820                 }
5821         }
5822 
5823         return (ret);
5824 }
5825 
5826 /*
5827  * zfs mount -a [nfs]
5828  * zfs mount filesystem
5829  *
5830  * Mount all filesystems, or mount the given filesystem.
5831  */
5832 static int
5833 zfs_do_mount(int argc, char **argv)
5834 {
5835         return (share_mount(OP_MOUNT, argc, argv));
5836 }
5837 
5838 /*
5839  * zfs share -a [nfs | smb]
5840  * zfs share filesystem
5841  *
5842  * Share all filesystems, or share the given filesystem.
5843  */
5844 static int
5845 zfs_do_share(int argc, char **argv)
5846 {
5847         return (share_mount(OP_SHARE, argc, argv));
5848 }
5849 
5850 typedef struct unshare_unmount_node {
5851         zfs_handle_t    *un_zhp;
5852         char            *un_mountp;
5853         uu_avl_node_t   un_avlnode;
5854 } unshare_unmount_node_t;
5855 
5856 /* ARGSUSED */
5857 static int
5858 unshare_unmount_compare(const void *larg, const void *rarg, void *unused)
5859 {
5860         const unshare_unmount_node_t *l = larg;
5861         const unshare_unmount_node_t *r = rarg;
5862 
5863         return (strcmp(l->un_mountp, r->un_mountp));
5864 }
5865 
5866 /*
5867  * Convenience routine used by zfs_do_umount() and manual_unmount().  Given an
5868  * absolute path, find the entry /etc/mnttab, verify that its a ZFS filesystem,
5869  * and unmount it appropriately.
5870  */
5871 static int
5872 unshare_unmount_path(int op, char *path, int flags, boolean_t is_manual)
5873 {
5874         zfs_handle_t *zhp;
5875         int ret = 0;
5876         struct stat64 statbuf;
5877         struct extmnttab entry;
5878         const char *cmdname = (op == OP_SHARE) ? "unshare" : "unmount";
5879         ino_t path_inode;
5880 
5881         /*
5882          * Search for the path in /etc/mnttab.  Rather than looking for the
5883          * specific path, which can be fooled by non-standard paths (i.e. ".."
5884          * or "//"), we stat() the path and search for the corresponding
5885          * (major,minor) device pair.
5886          */
5887         if (stat64(path, &statbuf) != 0) {
5888                 (void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
5889                     cmdname, path, strerror(errno));
5890                 return (1);
5891         }
5892         path_inode = statbuf.st_ino;
5893 
5894         /*
5895          * Search for the given (major,minor) pair in the mount table.
5896          */
5897         rewind(mnttab_file);
5898         while ((ret = getextmntent(mnttab_file, &entry, 0)) == 0) {
5899                 if (entry.mnt_major == major(statbuf.st_dev) &&
5900                     entry.mnt_minor == minor(statbuf.st_dev))
5901                         break;
5902         }
5903         if (ret != 0) {
5904                 if (op == OP_SHARE) {
5905                         (void) fprintf(stderr, gettext("cannot %s '%s': not "
5906                             "currently mounted\n"), cmdname, path);
5907                         return (1);
5908                 }
5909                 (void) fprintf(stderr, gettext("warning: %s not in mnttab\n"),
5910                     path);
5911                 if ((ret = umount2(path, flags)) != 0)
5912                         (void) fprintf(stderr, gettext("%s: %s\n"), path,
5913                             strerror(errno));
5914                 return (ret != 0);
5915         }
5916 
5917         if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0) {
5918                 (void) fprintf(stderr, gettext("cannot %s '%s': not a ZFS "
5919                     "filesystem\n"), cmdname, path);
5920                 return (1);
5921         }
5922 
5923         if ((zhp = zfs_open(g_zfs, entry.mnt_special,
5924             ZFS_TYPE_FILESYSTEM)) == NULL)
5925                 return (1);
5926 
5927         ret = 1;
5928         if (stat64(entry.mnt_mountp, &statbuf) != 0) {
5929                 (void) fprintf(stderr, gettext("cannot %s '%s': %s\n"),
5930                     cmdname, path, strerror(errno));
5931                 goto out;
5932         } else if (statbuf.st_ino != path_inode) {
5933                 (void) fprintf(stderr, gettext("cannot "
5934                     "%s '%s': not a mountpoint\n"), cmdname, path);
5935                 goto out;
5936         }
5937 
5938         if (op == OP_SHARE) {
5939                 char nfs_mnt_prop[ZFS_MAXPROPLEN];
5940                 char smbshare_prop[ZFS_MAXPROPLEN];
5941 
5942                 verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS, nfs_mnt_prop,
5943                     sizeof (nfs_mnt_prop), NULL, NULL, 0, B_FALSE) == 0);
5944                 verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB, smbshare_prop,
5945                     sizeof (smbshare_prop), NULL, NULL, 0, B_FALSE) == 0);
5946 
5947                 if (strcmp(nfs_mnt_prop, "off") == 0 &&
5948                     strcmp(smbshare_prop, "off") == 0) {
5949                         (void) fprintf(stderr, gettext("cannot unshare "
5950                             "'%s': legacy share\n"), path);
5951                         (void) fprintf(stderr, gettext("use "
5952                             "unshare(1M) to unshare this filesystem\n"));
5953                 } else if (!zfs_is_shared(zhp)) {
5954                         (void) fprintf(stderr, gettext("cannot unshare '%s': "
5955                             "not currently shared\n"), path);
5956                 } else {
5957                         ret = zfs_unshareall_bypath(zhp, path);
5958                 }
5959         } else {
5960                 char mtpt_prop[ZFS_MAXPROPLEN];
5961 
5962                 verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mtpt_prop,
5963                     sizeof (mtpt_prop), NULL, NULL, 0, B_FALSE) == 0);
5964 
5965                 if (is_manual) {
5966                         ret = zfs_unmount(zhp, NULL, flags);
5967                 } else if (strcmp(mtpt_prop, "legacy") == 0) {
5968                         (void) fprintf(stderr, gettext("cannot unmount "
5969                             "'%s': legacy mountpoint\n"),
5970                             zfs_get_name(zhp));
5971                         (void) fprintf(stderr, gettext("use umount(1M) "
5972                             "to unmount this filesystem\n"));
5973                 } else {
5974                         ret = zfs_unmountall(zhp, flags);
5975                 }
5976         }
5977 
5978 out:
5979         zfs_close(zhp);
5980 
5981         return (ret != 0);
5982 }
5983 
5984 /*
5985  * Generic callback for unsharing or unmounting a filesystem.
5986  */
5987 static int
5988 unshare_unmount(int op, int argc, char **argv)
5989 {
5990         int do_all = 0;
5991         int flags = 0;
5992         int ret = 0;
5993         int c;
5994         zfs_handle_t *zhp;
5995         char nfs_mnt_prop[ZFS_MAXPROPLEN];
5996         char sharesmb[ZFS_MAXPROPLEN];
5997 
5998         /* check options */
5999         while ((c = getopt(argc, argv, op == OP_SHARE ? "a" : "af")) != -1) {
6000                 switch (c) {
6001                 case 'a':
6002                         do_all = 1;
6003                         break;
6004                 case 'f':
6005                         flags = MS_FORCE;
6006                         break;
6007                 case '?':
6008                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
6009                             optopt);
6010                         usage(B_FALSE);
6011                 }
6012         }
6013 
6014         argc -= optind;
6015         argv += optind;
6016 
6017         if (do_all) {
6018                 /*
6019                  * We could make use of zfs_for_each() to walk all datasets in
6020                  * the system, but this would be very inefficient, especially
6021                  * since we would have to linearly search /etc/mnttab for each
6022                  * one.  Instead, do one pass through /etc/mnttab looking for
6023                  * zfs entries and call zfs_unmount() for each one.
6024                  *
6025                  * Things get a little tricky if the administrator has created
6026                  * mountpoints beneath other ZFS filesystems.  In this case, we
6027                  * have to unmount the deepest filesystems first.  To accomplish
6028                  * this, we place all the mountpoints in an AVL tree sorted by
6029                  * the special type (dataset name), and walk the result in
6030                  * reverse to make sure to get any snapshots first.
6031                  */
6032                 struct mnttab entry;
6033                 uu_avl_pool_t *pool;
6034                 uu_avl_t *tree;
6035                 unshare_unmount_node_t *node;
6036                 uu_avl_index_t idx;
6037                 uu_avl_walk_t *walk;
6038 
6039                 if (argc != 0) {
6040                         (void) fprintf(stderr, gettext("too many arguments\n"));
6041                         usage(B_FALSE);
6042                 }
6043 
6044                 if (((pool = uu_avl_pool_create("unmount_pool",
6045                     sizeof (unshare_unmount_node_t),
6046                     offsetof(unshare_unmount_node_t, un_avlnode),
6047                     unshare_unmount_compare, UU_DEFAULT)) == NULL) ||
6048                     ((tree = uu_avl_create(pool, NULL, UU_DEFAULT)) == NULL))
6049                         nomem();
6050 
6051                 rewind(mnttab_file);
6052                 while (getmntent(mnttab_file, &entry) == 0) {
6053 
6054                         /* ignore non-ZFS entries */
6055                         if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
6056                                 continue;
6057 
6058                         /* ignore snapshots */
6059                         if (strchr(entry.mnt_special, '@') != NULL)
6060                                 continue;
6061 
6062                         if ((zhp = zfs_open(g_zfs, entry.mnt_special,
6063                             ZFS_TYPE_FILESYSTEM)) == NULL) {
6064                                 ret = 1;
6065                                 continue;
6066                         }
6067 
6068                         switch (op) {
6069                         case OP_SHARE:
6070                                 verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
6071                                     nfs_mnt_prop,
6072                                     sizeof (nfs_mnt_prop),
6073                                     NULL, NULL, 0, B_FALSE) == 0);
6074                                 if (strcmp(nfs_mnt_prop, "off") != 0)
6075                                         break;
6076                                 verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
6077                                     nfs_mnt_prop,
6078                                     sizeof (nfs_mnt_prop),
6079                                     NULL, NULL, 0, B_FALSE) == 0);
6080                                 if (strcmp(nfs_mnt_prop, "off") == 0)
6081                                         continue;
6082                                 break;
6083                         case OP_MOUNT:
6084                                 /* Ignore legacy mounts */
6085                                 verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
6086                                     nfs_mnt_prop,
6087                                     sizeof (nfs_mnt_prop),
6088                                     NULL, NULL, 0, B_FALSE) == 0);
6089                                 if (strcmp(nfs_mnt_prop, "legacy") == 0)
6090                                         continue;
6091                                 /* Ignore canmount=noauto mounts */
6092                                 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) ==
6093                                     ZFS_CANMOUNT_NOAUTO)
6094                                         continue;
6095                         default:
6096                                 break;
6097                         }
6098 
6099                         node = safe_malloc(sizeof (unshare_unmount_node_t));
6100                         node->un_zhp = zhp;
6101                         node->un_mountp = safe_strdup(entry.mnt_mountp);
6102 
6103                         uu_avl_node_init(node, &node->un_avlnode, pool);
6104 
6105                         if (uu_avl_find(tree, node, NULL, &idx) == NULL) {
6106                                 uu_avl_insert(tree, node, idx);
6107                         } else {
6108                                 zfs_close(node->un_zhp);
6109                                 free(node->un_mountp);
6110                                 free(node);
6111                         }
6112                 }
6113 
6114                 /*
6115                  * Walk the AVL tree in reverse, unmounting each filesystem and
6116                  * removing it from the AVL tree in the process.
6117                  */
6118                 if ((walk = uu_avl_walk_start(tree,
6119                     UU_WALK_REVERSE | UU_WALK_ROBUST)) == NULL)
6120                         nomem();
6121 
6122                 while ((node = uu_avl_walk_next(walk)) != NULL) {
6123                         uu_avl_remove(tree, node);
6124 
6125                         switch (op) {
6126                         case OP_SHARE:
6127                                 if (zfs_unshareall_bypath(node->un_zhp,
6128                                     node->un_mountp) != 0)
6129                                         ret = 1;
6130                                 break;
6131 
6132                         case OP_MOUNT:
6133                                 if (zfs_unmount(node->un_zhp,
6134                                     node->un_mountp, flags) != 0)
6135                                         ret = 1;
6136                                 break;
6137                         }
6138 
6139                         zfs_close(node->un_zhp);
6140                         free(node->un_mountp);
6141                         free(node);
6142                 }
6143 
6144                 uu_avl_walk_end(walk);
6145                 uu_avl_destroy(tree);
6146                 uu_avl_pool_destroy(pool);
6147 
6148         } else {
6149                 if (argc != 1) {
6150                         if (argc == 0)
6151                                 (void) fprintf(stderr,
6152                                     gettext("missing filesystem argument\n"));
6153                         else
6154                                 (void) fprintf(stderr,
6155                                     gettext("too many arguments\n"));
6156                         usage(B_FALSE);
6157                 }
6158 
6159                 /*
6160                  * We have an argument, but it may be a full path or a ZFS
6161                  * filesystem.  Pass full paths off to unmount_path() (shared by
6162                  * manual_unmount), otherwise open the filesystem and pass to
6163                  * zfs_unmount().
6164                  */
6165                 if (argv[0][0] == '/')
6166                         return (unshare_unmount_path(op, argv[0],
6167                             flags, B_FALSE));
6168 
6169                 if ((zhp = zfs_open(g_zfs, argv[0],
6170                     ZFS_TYPE_FILESYSTEM)) == NULL)
6171                         return (1);
6172 
6173                 verify(zfs_prop_get(zhp, op == OP_SHARE ?
6174                     ZFS_PROP_SHARENFS : ZFS_PROP_MOUNTPOINT,
6175                     nfs_mnt_prop, sizeof (nfs_mnt_prop), NULL,
6176                     NULL, 0, B_FALSE) == 0);
6177 
6178                 switch (op) {
6179                 case OP_SHARE:
6180                         verify(zfs_prop_get(zhp, ZFS_PROP_SHARENFS,
6181                             nfs_mnt_prop,
6182                             sizeof (nfs_mnt_prop),
6183                             NULL, NULL, 0, B_FALSE) == 0);
6184                         verify(zfs_prop_get(zhp, ZFS_PROP_SHARESMB,
6185                             sharesmb, sizeof (sharesmb), NULL, NULL,
6186                             0, B_FALSE) == 0);
6187 
6188                         if (strcmp(nfs_mnt_prop, "off") == 0 &&
6189                             strcmp(sharesmb, "off") == 0) {
6190                                 (void) fprintf(stderr, gettext("cannot "
6191                                     "unshare '%s': legacy share\n"),
6192                                     zfs_get_name(zhp));
6193                                 (void) fprintf(stderr, gettext("use "
6194                                     "unshare(1M) to unshare this "
6195                                     "filesystem\n"));
6196                                 ret = 1;
6197                         } else if (!zfs_is_shared(zhp)) {
6198                                 (void) fprintf(stderr, gettext("cannot "
6199                                     "unshare '%s': not currently "
6200                                     "shared\n"), zfs_get_name(zhp));
6201                                 ret = 1;
6202                         } else if (zfs_unshareall(zhp) != 0) {
6203                                 ret = 1;
6204                         }
6205                         break;
6206 
6207                 case OP_MOUNT:
6208                         if (strcmp(nfs_mnt_prop, "legacy") == 0) {
6209                                 (void) fprintf(stderr, gettext("cannot "
6210                                     "unmount '%s': legacy "
6211                                     "mountpoint\n"), zfs_get_name(zhp));
6212                                 (void) fprintf(stderr, gettext("use "
6213                                     "umount(1M) to unmount this "
6214                                     "filesystem\n"));
6215                                 ret = 1;
6216                         } else if (!zfs_is_mounted(zhp, NULL)) {
6217                                 (void) fprintf(stderr, gettext("cannot "
6218                                     "unmount '%s': not currently "
6219                                     "mounted\n"),
6220                                     zfs_get_name(zhp));
6221                                 ret = 1;
6222                         } else if (zfs_unmountall(zhp, flags) != 0) {
6223                                 ret = 1;
6224                         }
6225                         break;
6226                 }
6227 
6228                 zfs_close(zhp);
6229         }
6230 
6231         return (ret);
6232 }
6233 
6234 /*
6235  * zfs unmount -a
6236  * zfs unmount filesystem
6237  *
6238  * Unmount all filesystems, or a specific ZFS filesystem.
6239  */
6240 static int
6241 zfs_do_unmount(int argc, char **argv)
6242 {
6243         return (unshare_unmount(OP_MOUNT, argc, argv));
6244 }
6245 
6246 /*
6247  * zfs unshare -a
6248  * zfs unshare filesystem
6249  *
6250  * Unshare all filesystems, or a specific ZFS filesystem.
6251  */
6252 static int
6253 zfs_do_unshare(int argc, char **argv)
6254 {
6255         return (unshare_unmount(OP_SHARE, argc, argv));
6256 }
6257 
6258 /*
6259  * Called when invoked as /etc/fs/zfs/mount.  Do the mount if the mountpoint is
6260  * 'legacy'.  Otherwise, complain that use should be using 'zfs mount'.
6261  */
6262 static int
6263 manual_mount(int argc, char **argv)
6264 {
6265         zfs_handle_t *zhp;
6266         char mountpoint[ZFS_MAXPROPLEN];
6267         char mntopts[MNT_LINE_MAX] = { '\0' };
6268         int ret = 0;
6269         int c;
6270         int flags = 0;
6271         char *dataset, *path;
6272 
6273         /* check options */
6274         while ((c = getopt(argc, argv, ":mo:O")) != -1) {
6275                 switch (c) {
6276                 case 'o':
6277                         (void) strlcpy(mntopts, optarg, sizeof (mntopts));
6278                         break;
6279                 case 'O':
6280                         flags |= MS_OVERLAY;
6281                         break;
6282                 case 'm':
6283                         flags |= MS_NOMNTTAB;
6284                         break;
6285                 case ':':
6286                         (void) fprintf(stderr, gettext("missing argument for "
6287                             "'%c' option\n"), optopt);
6288                         usage(B_FALSE);
6289                         break;
6290                 case '?':
6291                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
6292                             optopt);
6293                         (void) fprintf(stderr, gettext("usage: mount [-o opts] "
6294                             "<path>\n"));
6295                         return (2);
6296                 }
6297         }
6298 
6299         argc -= optind;
6300         argv += optind;
6301 
6302         /* check that we only have two arguments */
6303         if (argc != 2) {
6304                 if (argc == 0)
6305                         (void) fprintf(stderr, gettext("missing dataset "
6306                             "argument\n"));
6307                 else if (argc == 1)
6308                         (void) fprintf(stderr,
6309                             gettext("missing mountpoint argument\n"));
6310                 else
6311                         (void) fprintf(stderr, gettext("too many arguments\n"));
6312                 (void) fprintf(stderr, "usage: mount <dataset> <mountpoint>\n");
6313                 return (2);
6314         }
6315 
6316         dataset = argv[0];
6317         path = argv[1];
6318 
6319         /* try to open the dataset */
6320         if ((zhp = zfs_open(g_zfs, dataset, ZFS_TYPE_FILESYSTEM)) == NULL)
6321                 return (1);
6322 
6323         (void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
6324             sizeof (mountpoint), NULL, NULL, 0, B_FALSE);
6325 
6326         /* check for legacy mountpoint and complain appropriately */
6327         ret = 0;
6328         if (strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) == 0) {
6329                 if (mount(dataset, path, MS_OPTIONSTR | flags, MNTTYPE_ZFS,
6330                     NULL, 0, mntopts, sizeof (mntopts)) != 0) {
6331                         (void) fprintf(stderr, gettext("mount failed: %s\n"),
6332                             strerror(errno));
6333                         ret = 1;
6334                 }
6335         } else {
6336                 (void) fprintf(stderr, gettext("filesystem '%s' cannot be "
6337                     "mounted using 'mount -F zfs'\n"), dataset);
6338                 (void) fprintf(stderr, gettext("Use 'zfs set mountpoint=%s' "
6339                     "instead.\n"), path);
6340                 (void) fprintf(stderr, gettext("If you must use 'mount -F zfs' "
6341                     "or /etc/vfstab, use 'zfs set mountpoint=legacy'.\n"));
6342                 (void) fprintf(stderr, gettext("See zfs(1M) for more "
6343                     "information.\n"));
6344                 ret = 1;
6345         }
6346 
6347         return (ret);
6348 }
6349 
6350 /*
6351  * Called when invoked as /etc/fs/zfs/umount.  Unlike a manual mount, we allow
6352  * unmounts of non-legacy filesystems, as this is the dominant administrative
6353  * interface.
6354  */
6355 static int
6356 manual_unmount(int argc, char **argv)
6357 {
6358         int flags = 0;
6359         int c;
6360 
6361         /* check options */
6362         while ((c = getopt(argc, argv, "f")) != -1) {
6363                 switch (c) {
6364                 case 'f':
6365                         flags = MS_FORCE;
6366                         break;
6367                 case '?':
6368                         (void) fprintf(stderr, gettext("invalid option '%c'\n"),
6369                             optopt);
6370                         (void) fprintf(stderr, gettext("usage: unmount [-f] "
6371                             "<path>\n"));
6372                         return (2);
6373                 }
6374         }
6375 
6376         argc -= optind;
6377         argv += optind;
6378 
6379         /* check arguments */
6380         if (argc != 1) {
6381                 if (argc == 0)
6382                         (void) fprintf(stderr, gettext("missing path "
6383                             "argument\n"));
6384                 else
6385                         (void) fprintf(stderr, gettext("too many arguments\n"));
6386                 (void) fprintf(stderr, gettext("usage: unmount [-f] <path>\n"));
6387                 return (2);
6388         }
6389 
6390         return (unshare_unmount_path(OP_MOUNT, argv[0], flags, B_TRUE));
6391 }
6392 
6393 static int
6394 find_command_idx(char *command, int *idx)
6395 {
6396         int i;
6397 
6398         for (i = 0; i < NCOMMAND; i++) {
6399                 if (command_table[i].name == NULL)
6400                         continue;
6401 
6402                 if (strcmp(command, command_table[i].name) == 0) {
6403                         *idx = i;
6404                         return (0);
6405                 }
6406         }
6407         return (1);
6408 }
6409 
6410 static int
6411 zfs_do_diff(int argc, char **argv)
6412 {
6413         zfs_handle_t *zhp;
6414         int flags = 0;
6415         char *tosnap = NULL;
6416         char *fromsnap = NULL;
6417         char *atp, *copy;
6418         int err = 0;
6419         int c;
6420 
6421         while ((c = getopt(argc, argv, "FHt")) != -1) {
6422                 switch (c) {
6423                 case 'F':
6424                         flags |= ZFS_DIFF_CLASSIFY;
6425                         break;
6426                 case 'H':
6427                         flags |= ZFS_DIFF_PARSEABLE;
6428                         break;
6429                 case 't':
6430                         flags |= ZFS_DIFF_TIMESTAMP;
6431                         break;
6432                 default:
6433                         (void) fprintf(stderr,
6434                             gettext("invalid option '%c'\n"), optopt);
6435                         usage(B_FALSE);
6436                 }
6437         }
6438 
6439         argc -= optind;
6440         argv += optind;
6441 
6442         if (argc < 1) {
6443                 (void) fprintf(stderr,
6444                 gettext("must provide at least one snapshot name\n"));
6445                 usage(B_FALSE);
6446         }
6447 
6448         if (argc > 2) {
6449                 (void) fprintf(stderr, gettext("too many arguments\n"));
6450                 usage(B_FALSE);
6451         }
6452 
6453         fromsnap = argv[0];
6454         tosnap = (argc == 2) ? argv[1] : NULL;
6455 
6456         copy = NULL;
6457         if (*fromsnap != '@')
6458                 copy = strdup(fromsnap);
6459         else if (tosnap)
6460                 copy = strdup(tosnap);
6461         if (copy == NULL)
6462                 usage(B_FALSE);
6463 
6464         if (atp = strchr(copy, '@'))
6465                 *atp = '\0';
6466 
6467         if ((zhp = zfs_open(g_zfs, copy, ZFS_TYPE_FILESYSTEM)) == NULL)
6468                 return (1);
6469 
6470         free(copy);
6471 
6472         /*
6473          * Ignore SIGPIPE so that the library can give us
6474          * information on any failure
6475          */
6476         (void) sigignore(SIGPIPE);
6477 
6478         err = zfs_show_diffs(zhp, STDOUT_FILENO, fromsnap, tosnap, flags);
6479 
6480         zfs_close(zhp);
6481 
6482         return (err != 0);
6483 }
6484 
6485 int
6486 main(int argc, char **argv)
6487 {
6488         int ret = 0;
6489         int i;
6490         char *progname;
6491         char *cmdname;
6492 
6493         (void) setlocale(LC_ALL, "");
6494         (void) textdomain(TEXT_DOMAIN);
6495 
6496         opterr = 0;
6497 
6498         if ((g_zfs = libzfs_init()) == NULL) {
6499                 (void) fprintf(stderr, gettext("internal error: failed to "
6500                     "initialize ZFS library\n"));
6501                 return (1);
6502         }
6503 
6504         zfs_save_arguments(argc, argv, history_str, sizeof (history_str));
6505 
6506         libzfs_print_on_error(g_zfs, B_TRUE);
6507 
6508         if ((mnttab_file = fopen(MNTTAB, "r")) == NULL) {
6509                 (void) fprintf(stderr, gettext("internal error: unable to "
6510                     "open %s\n"), MNTTAB);
6511                 return (1);
6512         }
6513 
6514         /*
6515          * This command also doubles as the /etc/fs mount and unmount program.
6516          * Determine if we should take this behavior based on argv[0].
6517          */
6518         progname = basename(argv[0]);
6519         if (strcmp(progname, "mount") == 0) {
6520                 ret = manual_mount(argc, argv);
6521         } else if (strcmp(progname, "umount") == 0) {
6522                 ret = manual_unmount(argc, argv);
6523         } else {
6524                 /*
6525                  * Make sure the user has specified some command.
6526                  */
6527                 if (argc < 2) {
6528                         (void) fprintf(stderr, gettext("missing command\n"));
6529                         usage(B_FALSE);
6530                 }
6531 
6532                 cmdname = argv[1];
6533 
6534                 /*
6535                  * The 'umount' command is an alias for 'unmount'
6536                  */
6537                 if (strcmp(cmdname, "umount") == 0)
6538                         cmdname = "unmount";
6539 
6540                 /*
6541                  * The 'recv' command is an alias for 'receive'
6542                  */
6543                 if (strcmp(cmdname, "recv") == 0)
6544                         cmdname = "receive";
6545 
6546                 /*
6547                  * Special case '-?'
6548                  */
6549                 if (strcmp(cmdname, "-?") == 0)
6550                         usage(B_TRUE);
6551 
6552                 /*
6553                  * Run the appropriate command.
6554                  */
6555                 libzfs_mnttab_cache(g_zfs, B_TRUE);
6556                 if (find_command_idx(cmdname, &i) == 0) {
6557                         current_command = &command_table[i];
6558                         ret = command_table[i].func(argc - 1, argv + 1);
6559                 } else if (strchr(cmdname, '=') != NULL) {
6560                         verify(find_command_idx("set", &i) == 0);
6561                         current_command = &command_table[i];
6562                         ret = command_table[i].func(argc, argv);
6563                 } else {
6564                         (void) fprintf(stderr, gettext("unrecognized "
6565                             "command '%s'\n"), cmdname);
6566                         usage(B_FALSE);
6567                 }
6568                 libzfs_mnttab_cache(g_zfs, B_FALSE);
6569         }
6570 
6571         (void) fclose(mnttab_file);
6572 
6573         if (ret == 0 && log_history)
6574                 (void) zpool_log_history(g_zfs, history_str);
6575 
6576         libzfs_fini(g_zfs);
6577 
6578         /*
6579          * The 'ZFS_ABORT' environment variable causes us to dump core on exit
6580          * for the purposes of running ::findleaks.
6581          */
6582         if (getenv("ZFS_ABORT") != NULL) {
6583                 (void) printf("dumping core by request\n");
6584                 abort();
6585         }
6586 
6587         return (ret);
6588 }