cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c

   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 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include <assert.h>
  28 #include <ctype.h>
  29 #include <errno.h>
  30 #include <libintl.h>
  31 #include <math.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <strings.h>
  35 #include <unistd.h>
  36 #include <stddef.h>
  37 #include <zone.h>
  38 #include <fcntl.h>
  39 #include <sys/mntent.h>
  40 #include <sys/mount.h>
  41 #include <sys/avl.h>
  42 #include <priv.h>
  43 #include <pwd.h>
  44 #include <grp.h>
  45 #include <stddef.h>
  46 #include <idmap.h>
  47
  48 #include <sys/spa.h>
  49 #include <sys/zap.h>
  50 #include <sys/misc.h>
  51 #include <libzfs.h>
  52
  53 #include "zfs_namecheck.h"
  54 #include "zfs_prop.h"
  55 #include "libzfs_impl.h"
  56 #include "zfs_deleg.h"
  57
  58 static int zvol_create_link_common(libzfs_handle_t *, const char *, int);
  59 static int userquota_propname_decode(const char *propname, boolean_t zoned,
  60     zfs_userquota_prop_t *typep, char *domain, int domainlen, uint64_t *ridp);
  61
  62 /*
  63  * Given a single type (not a mask of types), return the type in a human
  64  * readable form.
  65  */
  66 const char *
  67 zfs_type_to_name(zfs_type_t type)
  68 {
  69         switch (type) {
  70         case ZFS_TYPE_FILESYSTEM:
  71                 return (dgettext(TEXT_DOMAIN, "filesystem"));
  72         case ZFS_TYPE_SNAPSHOT:
  73                 return (dgettext(TEXT_DOMAIN, "snapshot"));
  74         case ZFS_TYPE_VOLUME:
  75                 return (dgettext(TEXT_DOMAIN, "volume"));
  76         }
  77
  78         return (NULL);
  79 }
  80
  81 /*
  82  * Given a path and mask of ZFS types, return a string describing this dataset.
  83  * This is used when we fail to open a dataset and we cannot get an exact type.
  84  * We guess what the type would have been based on the path and the mask of
  85  * acceptable types.
  86  */
  87 static const char *
  88 path_to_str(const char *path, int types)
  89 {
  90         /*
  91          * When given a single type, always report the exact type.
  92          */
  93         if (types == ZFS_TYPE_SNAPSHOT)
  94                 return (dgettext(TEXT_DOMAIN, "snapshot"));
  95         if (types == ZFS_TYPE_FILESYSTEM)
  96                 return (dgettext(TEXT_DOMAIN, "filesystem"));
  97         if (types == ZFS_TYPE_VOLUME)
  98                 return (dgettext(TEXT_DOMAIN, "volume"));
  99
 100         /*
 101          * The user is requesting more than one type of dataset.  If this is the
 102          * case, consult the path itself.  If we're looking for a snapshot, and
 103          * a '@' is found, then report it as "snapshot".  Otherwise, remove the
 104          * snapshot attribute and try again.
 105          */
 106         if (types & ZFS_TYPE_SNAPSHOT) {
 107                 if (strchr(path, '@') != NULL)
 108                         return (dgettext(TEXT_DOMAIN, "snapshot"));
 109                 return (path_to_str(path, types & ~ZFS_TYPE_SNAPSHOT));
 110         }
 111
 112         /*
 113          * The user has requested either filesystems or volumes.
 114          * We have no way of knowing a priori what type this would be, so always
 115          * report it as "filesystem" or "volume", our two primitive types.
 116          */
 117         if (types & ZFS_TYPE_FILESYSTEM)
 118                 return (dgettext(TEXT_DOMAIN, "filesystem"));
 119
 120         assert(types & ZFS_TYPE_VOLUME);
 121         return (dgettext(TEXT_DOMAIN, "volume"));
 122 }
 123
 124 /*
 125  * Validate a ZFS path.  This is used even before trying to open the dataset, to
 126  * provide a more meaningful error message.  We call zfs_error_aux() to
 127  * explain exactly why the name was not valid.
 128  */
 129 static int
 130 zfs_validate_name(libzfs_handle_t *hdl, const char *path, int type,
 131     boolean_t modifying)
 132 {
 133         namecheck_err_t why;
 134         char what;
 135
 136         if (dataset_namecheck(path, &why, &what) != 0) {
 137                 if (hdl != NULL) {
 138                         switch (why) {
 139                         case NAME_ERR_TOOLONG:
 140                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 141                                     "name is too long"));
 142                                 break;
 143
 144                         case NAME_ERR_LEADING_SLASH:
 145                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 146                                     "leading slash in name"));
 147                                 break;
 148
 149                         case NAME_ERR_EMPTY_COMPONENT:
 150                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 151                                     "empty component in name"));
 152                                 break;
 153
 154                         case NAME_ERR_TRAILING_SLASH:
 155                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 156                                     "trailing slash in name"));
 157                                 break;
 158
 159                         case NAME_ERR_INVALCHAR:
 160                                 zfs_error_aux(hdl,
 161                                     dgettext(TEXT_DOMAIN, "invalid character "
 162                                     "'%c' in name"), what);
 163                                 break;
 164
 165                         case NAME_ERR_MULTIPLE_AT:
 166                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 167                                     "multiple '@' delimiters in name"));
 168                                 break;
 169
 170                         case NAME_ERR_NOLETTER:
 171                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 172                                     "pool doesn't begin with a letter"));
 173                                 break;
 174
 175                         case NAME_ERR_RESERVED:
 176                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 177                                     "name is reserved"));
 178                                 break;
 179
 180                         case NAME_ERR_DISKLIKE:
 181                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 182                                     "reserved disk name"));
 183                                 break;
 184                         }
 185                 }
 186
 187                 return (0);
 188         }
 189
 190         if (!(type & ZFS_TYPE_SNAPSHOT) && strchr(path, '@') != NULL) {
 191                 if (hdl != NULL)
 192                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 193                             "snapshot delimiter '@' in filesystem name"));
 194                 return (0);
 195         }
 196
 197         if (type == ZFS_TYPE_SNAPSHOT && strchr(path, '@') == NULL) {
 198                 if (hdl != NULL)
 199                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 200                             "missing '@' delimiter in snapshot name"));
 201                 return (0);
 202         }
 203
 204         if (modifying && strchr(path, '%') != NULL) {
 205                 if (hdl != NULL)
 206                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 207                             "invalid character %c in name"), '%');
 208                 return (0);
 209         }
 210
 211         return (-1);
 212 }
 213
 214 int
 215 zfs_name_valid(const char *name, zfs_type_t type)
 216 {
 217         if (type == ZFS_TYPE_POOL)
 218                 return (zpool_name_valid(NULL, B_FALSE, name));
 219         return (zfs_validate_name(NULL, name, type, B_FALSE));
 220 }
 221
 222 /*
 223  * This function takes the raw DSL properties, and filters out the user-defined
 224  * properties into a separate nvlist.
 225  */
 226 static nvlist_t *
 227 process_user_props(zfs_handle_t *zhp, nvlist_t *props)
 228 {
 229         libzfs_handle_t *hdl = zhp->zfs_hdl;
 230         nvpair_t *elem;
 231         nvlist_t *propval;
 232         nvlist_t *nvl;
 233
 234         if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0) {
 235                 (void) no_memory(hdl);
 236                 return (NULL);
 237         }
 238
 239         elem = NULL;
 240         while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
 241                 if (!zfs_prop_user(nvpair_name(elem)))
 242                         continue;
 243
 244                 verify(nvpair_value_nvlist(elem, &propval) == 0);
 245                 if (nvlist_add_nvlist(nvl, nvpair_name(elem), propval) != 0) {
 246                         nvlist_free(nvl);
 247                         (void) no_memory(hdl);
 248                         return (NULL);
 249                 }
 250         }
 251
 252         return (nvl);
 253 }
 254
 255 static zpool_handle_t *
 256 zpool_add_handle(zfs_handle_t *zhp, const char *pool_name)
 257 {
 258         libzfs_handle_t *hdl = zhp->zfs_hdl;
 259         zpool_handle_t *zph;
 260
 261         if ((zph = zpool_open_canfail(hdl, pool_name)) != NULL) {
 262                 if (hdl->libzfs_pool_handles != NULL)
 263                         zph->zpool_next = hdl->libzfs_pool_handles;
 264                 hdl->libzfs_pool_handles = zph;
 265         }
 266         return (zph);
 267 }
 268
 269 static zpool_handle_t *
 270 zpool_find_handle(zfs_handle_t *zhp, const char *pool_name, int len)
 271 {
 272         libzfs_handle_t *hdl = zhp->zfs_hdl;
 273         zpool_handle_t *zph = hdl->libzfs_pool_handles;
 274
 275         while ((zph != NULL) &&
 276             (strncmp(pool_name, zpool_get_name(zph), len) != 0))
 277                 zph = zph->zpool_next;
 278         return (zph);
 279 }
 280
 281 /*
 282  * Returns a handle to the pool that contains the provided dataset.
 283  * If a handle to that pool already exists then that handle is returned.
 284  * Otherwise, a new handle is created and added to the list of handles.
 285  */
 286 static zpool_handle_t *
 287 zpool_handle(zfs_handle_t *zhp)
 288 {
 289         char *pool_name;
 290         int len;
 291         zpool_handle_t *zph;
 292
 293         len = strcspn(zhp->zfs_name, "/@") + 1;
 294         pool_name = zfs_alloc(zhp->zfs_hdl, len);
 295         (void) strlcpy(pool_name, zhp->zfs_name, len);
 296
 297         zph = zpool_find_handle(zhp, pool_name, len);
 298         if (zph == NULL)
 299                 zph = zpool_add_handle(zhp, pool_name);
 300
 301         free(pool_name);
 302         return (zph);
 303 }
 304
 305 void
 306 zpool_free_handles(libzfs_handle_t *hdl)
 307 {
 308         zpool_handle_t *next, *zph = hdl->libzfs_pool_handles;
 309
 310         while (zph != NULL) {
 311                 next = zph->zpool_next;
 312                 zpool_close(zph);
 313                 zph = next;
 314         }
 315         hdl->libzfs_pool_handles = NULL;
 316 }
 317
 318 /*
 319  * Utility function to gather stats (objset and zpl) for the given object.
 320  */
 321 get_stats_ioctl(zfs_handle_t *zhp, zfs_cmd_t *zc)
 322 {
 323         libzfs_handle_t *hdl = zhp->zfs_hdl;
 324
 325         (void) strlcpy(zc->zc_name, zhp->zfs_name, sizeof (zc->zc_name));
 326
 327         while (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, zc) != 0) {
 328                 if (errno == ENOMEM) {
 329                         if (zcmd_expand_dst_nvlist(hdl, zc) != 0) {
 330                                 return (-1);
 331                         }
 332                 } else {
 333                         return (-1);
 334                 }
 335         }
 336         return (0);
 337 }
 338
 339 static int
 340 put_stats_zhdl(zfs_handle_t *zhp, zfs_cmd_t *zc)
 341 {
 342         nvlist_t *allprops, *userprops;
 343
 344         zhp->zfs_dmustats = zc->zc_objset_stats; /* structure assignment */
 345
 346         if (zcmd_read_dst_nvlist(zhp->zfs_hdl, zc, &allprops) != 0) {
 347                 return (-1);
 348         }
 349
 350         /*
 351          * XXX Why do we store the user props separately, in addition to
 352          * storing them in zfs_props?
 353          */
 354         if ((userprops = process_user_props(zhp, allprops)) == NULL) {
 355                 nvlist_free(allprops);
 356                 return (-1);
 357         }
 358
 359         nvlist_free(zhp->zfs_props);
 360         nvlist_free(zhp->zfs_user_props);
 361
 362         zhp->zfs_props = allprops;
 363         zhp->zfs_user_props = userprops;
 364
 365         return (0);
 366 }
 367
 368 static int
 369 get_stats(zfs_handle_t *zhp)
 370 {
 371         int rc = 0;
 372         zfs_cmd_t zc = { 0 };
 373
 374         if (zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
 375                 return (-1);
 376         if (get_stats_ioctl(zhp, &zc) != 0)
 377                 rc = -1;
 378         else if (put_stats_zhdl(zhp, &zc) != 0)
 379                 rc = -1;
 380         zcmd_free_nvlists(&zc);
 381         return (rc);
 382 }
 383
 384 /*
 385  * Refresh the properties currently stored in the handle.
 386  */
 387 void
 388 zfs_refresh_properties(zfs_handle_t *zhp)
 389 {
 390         (void) get_stats(zhp);
 391 }
 392
 393 /*
 394  * Makes a handle from the given dataset name.  Used by zfs_open() and
 395  * zfs_iter_* to create child handles on the fly.
 396  */
 397 static int
 398 make_dataset_handle_common(zfs_handle_t *zhp, zfs_cmd_t *zc)
 399 {
 400         char *logstr;
 401         libzfs_handle_t *hdl = zhp->zfs_hdl;
 402
 403         /*
 404          * Preserve history log string.
 405          * any changes performed here will be
 406          * logged as an internal event.
 407          */
 408         logstr = zhp->zfs_hdl->libzfs_log_str;
 409         zhp->zfs_hdl->libzfs_log_str = NULL;
 410
 411 top:
 412         if (put_stats_zhdl(zhp, zc) != 0) {
 413                 zhp->zfs_hdl->libzfs_log_str = logstr;
 414                 return (-1);
 415         }
 416
 417
 418         if (zhp->zfs_dmustats.dds_inconsistent) {
 419                 zfs_cmd_t zc2 = { 0 };
 420
 421                 /*
 422                  * If it is dds_inconsistent, then we've caught it in
 423                  * the middle of a 'zfs receive' or 'zfs destroy', and
 424                  * it is inconsistent from the ZPL's point of view, so
 425                  * can't be mounted.  However, it could also be that we
 426                  * have crashed in the middle of one of those
 427                  * operations, in which case we need to get rid of the
 428                  * inconsistent state.  We do that by either rolling
 429                  * back to the previous snapshot (which will fail if
 430                  * there is none), or destroying the filesystem.  Note
 431                  * that if we are still in the middle of an active
 432                  * 'receive' or 'destroy', then the rollback and destroy
 433                  * will fail with EBUSY and we will drive on as usual.
 434                  */
 435
 436                 (void) strlcpy(zc2.zc_name, zhp->zfs_name,
 437                     sizeof (zc2.zc_name));
 438
 439                 if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL) {
 440                         (void) zvol_remove_link(hdl, zhp->zfs_name);
 441                         zc2.zc_objset_type = DMU_OST_ZVOL;
 442                 } else {
 443                         zc2.zc_objset_type = DMU_OST_ZFS;
 444                 }
 445
 446                 /*
 447                  * If we can successfully destroy it, pretend that it
 448                  * never existed.
 449                  */
 450                 if (ioctl(hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc2) == 0) {
 451                         zhp->zfs_hdl->libzfs_log_str = logstr;
 452                         errno = ENOENT;
 453                         return (-1);
 454                 }
 455                 /* If we can successfully roll it back, reset the stats */
 456                 if (ioctl(hdl->libzfs_fd, ZFS_IOC_ROLLBACK, &zc2) == 0) {
 457                         if (get_stats_ioctl(zhp, zc) != 0) {
 458                                 zhp->zfs_hdl->libzfs_log_str = logstr;
 459                                 return (-1);
 460                         }
 461                         goto top;
 462                 }
 463         }
 464
 465         /*
 466          * We've managed to open the dataset and gather statistics.  Determine
 467          * the high-level type.
 468          */
 469         if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
 470                 zhp->zfs_head_type = ZFS_TYPE_VOLUME;
 471         else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
 472                 zhp->zfs_head_type = ZFS_TYPE_FILESYSTEM;
 473         else
 474                 abort();
 475
 476         if (zhp->zfs_dmustats.dds_is_snapshot)
 477                 zhp->zfs_type = ZFS_TYPE_SNAPSHOT;
 478         else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
 479                 zhp->zfs_type = ZFS_TYPE_VOLUME;
 480         else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
 481                 zhp->zfs_type = ZFS_TYPE_FILESYSTEM;
 482         else
 483                 abort();        /* we should never see any other types */
 484
 485         zhp->zfs_hdl->libzfs_log_str = logstr;
 486         zhp->zpool_hdl = zpool_handle(zhp);
 487         return (0);
 488 }
 489
 490 zfs_handle_t *
 491 make_dataset_handle(libzfs_handle_t *hdl, const char *path)
 492 {
 493         zfs_cmd_t zc = { 0 };
 494
 495         zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
 496
 497         if (zhp == NULL)
 498                 return (NULL);
 499
 500         zhp->zfs_hdl = hdl;
 501         (void) strlcpy(zhp->zfs_name, path, sizeof (zhp->zfs_name));
 502         if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0) {
 503                 free(zhp);
 504                 return (NULL);
 505         }
 506         if (get_stats_ioctl(zhp, &zc) == -1) {
 507                 zcmd_free_nvlists(&zc);
 508                 free(zhp);
 509                 return (NULL);
 510         }
 511         if (make_dataset_handle_common(zhp, &zc) == -1) {
 512                 free(zhp);
 513                 zhp = NULL;
 514         }
 515         zcmd_free_nvlists(&zc);
 516         return (zhp);
 517 }
 518
 519 static zfs_handle_t *
 520 make_dataset_handle_zc(libzfs_handle_t *hdl, zfs_cmd_t *zc)
 521 {
 522         zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
 523
 524         if (zhp == NULL)
 525                 return (NULL);
 526
 527         zhp->zfs_hdl = hdl;
 528         (void) strlcpy(zhp->zfs_name, zc->zc_name, sizeof (zhp->zfs_name));
 529         if (make_dataset_handle_common(zhp, zc) == -1) {
 530                 free(zhp);
 531                 return (NULL);
 532         }
 533         return (zhp);
 534 }
 535
 536 /*
 537  * Opens the given snapshot, filesystem, or volume.   The 'types'
 538  * argument is a mask of acceptable types.  The function will print an
 539  * appropriate error message and return NULL if it can't be opened.
 540  */
 541 zfs_handle_t *
 542 zfs_open(libzfs_handle_t *hdl, const char *path, int types)
 543 {
 544         zfs_handle_t *zhp;
 545         char errbuf[1024];
 546
 547         (void) snprintf(errbuf, sizeof (errbuf),
 548             dgettext(TEXT_DOMAIN, "cannot open '%s'"), path);
 549
 550         /*
 551          * Validate the name before we even try to open it.
 552          */
 553         if (!zfs_validate_name(hdl, path, ZFS_TYPE_DATASET, B_FALSE)) {
 554                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 555                     "invalid dataset name"));
 556                 (void) zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
 557                 return (NULL);
 558         }
 559
 560         /*
 561          * Try to get stats for the dataset, which will tell us if it exists.
 562          */
 563         errno = 0;
 564         if ((zhp = make_dataset_handle(hdl, path)) == NULL) {
 565                 (void) zfs_standard_error(hdl, errno, errbuf);
 566                 return (NULL);
 567         }
 568
 569         if (!(types & zhp->zfs_type)) {
 570                 (void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
 571                 zfs_close(zhp);
 572                 return (NULL);
 573         }
 574
 575         return (zhp);
 576 }
 577
 578 /*
 579  * Release a ZFS handle.  Nothing to do but free the associated memory.
 580  */
 581 void
 582 zfs_close(zfs_handle_t *zhp)
 583 {
 584         if (zhp->zfs_mntopts)
 585                 free(zhp->zfs_mntopts);
 586         nvlist_free(zhp->zfs_props);
 587         nvlist_free(zhp->zfs_user_props);
 588         free(zhp);
 589 }
 590
 591 typedef struct mnttab_node {
 592         struct mnttab mtn_mt;
 593         avl_node_t mtn_node;
 594 } mnttab_node_t;
 595
 596 static int
 597 libzfs_mnttab_cache_compare(const void *arg1, const void *arg2)
 598 {
 599         const mnttab_node_t *mtn1 = arg1;
 600         const mnttab_node_t *mtn2 = arg2;
 601         int rv;
 602
 603         rv = strcmp(mtn1->mtn_mt.mnt_special, mtn2->mtn_mt.mnt_special);
 604
 605         if (rv == 0)
 606                 return (0);
 607         return (rv > 0 ? 1 : -1);
 608 }
 609
 610 void
 611 libzfs_mnttab_init(libzfs_handle_t *hdl)
 612 {
 613         assert(avl_numnodes(&hdl->libzfs_mnttab_cache) == 0);
 614         avl_create(&hdl->libzfs_mnttab_cache, libzfs_mnttab_cache_compare,
 615             sizeof (mnttab_node_t), offsetof(mnttab_node_t, mtn_node));
 616 }
 617
 618 void
 619 libzfs_mnttab_update(libzfs_handle_t *hdl)
 620 {
 621         struct mnttab entry;
 622
 623         rewind(hdl->libzfs_mnttab);
 624         while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
 625                 mnttab_node_t *mtn;
 626
 627                 if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
 628                         continue;
 629                 mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
 630                 mtn->mtn_mt.mnt_special = zfs_strdup(hdl, entry.mnt_special);
 631                 mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, entry.mnt_mountp);
 632                 mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, entry.mnt_fstype);
 633                 mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, entry.mnt_mntopts);
 634                 avl_add(&hdl->libzfs_mnttab_cache, mtn);
 635         }
 636 }
 637
 638 void
 639 libzfs_mnttab_fini(libzfs_handle_t *hdl)
 640 {
 641         void *cookie = NULL;
 642         mnttab_node_t *mtn;
 643
 644         while (mtn = avl_destroy_nodes(&hdl->libzfs_mnttab_cache, &cookie)) {
 645                 free(mtn->mtn_mt.mnt_special);
 646                 free(mtn->mtn_mt.mnt_mountp);
 647                 free(mtn->mtn_mt.mnt_fstype);
 648                 free(mtn->mtn_mt.mnt_mntopts);
 649                 free(mtn);
 650         }
 651         avl_destroy(&hdl->libzfs_mnttab_cache);
 652 }
 653
 654 void
 655 libzfs_mnttab_cache(libzfs_handle_t *hdl, boolean_t enable)
 656 {
 657         hdl->libzfs_mnttab_enable = enable;
 658 }
 659
 660 int
 661 libzfs_mnttab_find(libzfs_handle_t *hdl, const char *fsname,
 662     struct mnttab *entry)
 663 {
 664         mnttab_node_t find;
 665         mnttab_node_t *mtn;
 666
 667         if (!hdl->libzfs_mnttab_enable) {
 668                 struct mnttab srch = { 0 };
 669
 670                 if (avl_numnodes(&hdl->libzfs_mnttab_cache))
 671                         libzfs_mnttab_fini(hdl);
 672                 rewind(hdl->libzfs_mnttab);
 673                 srch.mnt_special = (char *)fsname;
 674                 srch.mnt_fstype = MNTTYPE_ZFS;
 675                 if (getmntany(hdl->libzfs_mnttab, entry, &srch) == 0)
 676                         return (0);
 677                 else
 678                         return (ENOENT);
 679         }
 680
 681         if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0)
 682                 libzfs_mnttab_update(hdl);
 683
 684         find.mtn_mt.mnt_special = (char *)fsname;
 685         mtn = avl_find(&hdl->libzfs_mnttab_cache, &find, NULL);
 686         if (mtn) {
 687                 *entry = mtn->mtn_mt;
 688                 return (0);
 689         }
 690         return (ENOENT);
 691 }
 692
 693 void
 694 libzfs_mnttab_add(libzfs_handle_t *hdl, const char *special,
 695     const char *mountp, const char *mntopts)
 696 {
 697         mnttab_node_t *mtn;
 698
 699         if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0)
 700                 return;
 701         mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
 702         mtn->mtn_mt.mnt_special = zfs_strdup(hdl, special);
 703         mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, mountp);
 704         mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, MNTTYPE_ZFS);
 705         mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, mntopts);
 706         avl_add(&hdl->libzfs_mnttab_cache, mtn);
 707 }
 708
 709 void
 710 libzfs_mnttab_remove(libzfs_handle_t *hdl, const char *fsname)
 711 {
 712         mnttab_node_t find;
 713         mnttab_node_t *ret;
 714
 715         find.mtn_mt.mnt_special = (char *)fsname;
 716         if (ret = avl_find(&hdl->libzfs_mnttab_cache, (void *)&find, NULL)) {
 717                 avl_remove(&hdl->libzfs_mnttab_cache, ret);
 718                 free(ret->mtn_mt.mnt_special);
 719                 free(ret->mtn_mt.mnt_mountp);
 720                 free(ret->mtn_mt.mnt_fstype);
 721                 free(ret->mtn_mt.mnt_mntopts);
 722                 free(ret);
 723         }
 724 }
 725
 726 int
 727 zfs_spa_version(zfs_handle_t *zhp, int *spa_version)
 728 {
 729         zpool_handle_t *zpool_handle = zhp->zpool_hdl;
 730
 731         if (zpool_handle == NULL)
 732                 return (-1);
 733
 734         *spa_version = zpool_get_prop_int(zpool_handle,
 735             ZPOOL_PROP_VERSION, NULL);
 736         return (0);
 737 }
 738
 739 /*
 740  * The choice of reservation property depends on the SPA version.
 741  */
 742 static int
 743 zfs_which_resv_prop(zfs_handle_t *zhp, zfs_prop_t *resv_prop)
 744 {
 745         int spa_version;
 746
 747         if (zfs_spa_version(zhp, &spa_version) < 0)
 748                 return (-1);
 749
 750         if (spa_version >= SPA_VERSION_REFRESERVATION)
 751                 *resv_prop = ZFS_PROP_REFRESERVATION;
 752         else
 753                 *resv_prop = ZFS_PROP_RESERVATION;
 754
 755         return (0);
 756 }
 757
 758 /*
 759  * Given an nvlist of properties to set, validates that they are correct, and
 760  * parses any numeric properties (index, boolean, etc) if they are specified as
 761  * strings.
 762  */
 763 nvlist_t *
 764 zfs_valid_proplist(libzfs_handle_t *hdl, zfs_type_t type, nvlist_t *nvl,
 765     uint64_t zoned, zfs_handle_t *zhp, const char *errbuf)
 766 {
 767         nvpair_t *elem;
 768         uint64_t intval;
 769         char *strval;
 770         zfs_prop_t prop;
 771         nvlist_t *ret;
 772         int chosen_normal = -1;
 773         int chosen_utf = -1;
 774
 775         if (nvlist_alloc(&ret, NV_UNIQUE_NAME, 0) != 0) {
 776                 (void) no_memory(hdl);
 777                 return (NULL);
 778         }
 779
 780         /*
 781          * Make sure this property is valid and applies to this type.
 782          */
 783
 784         elem = NULL;
 785         while ((elem = nvlist_next_nvpair(nvl, elem)) != NULL) {
 786                 const char *propname = nvpair_name(elem);
 787
 788                 prop = zfs_name_to_prop(propname);
 789                 if (prop == ZPROP_INVAL && zfs_prop_user(propname)) {
 790                         /*
 791                          * This is a user property: make sure it's a
 792                          * string, and that it's less than ZAP_MAXNAMELEN.
 793                          */
 794                         if (nvpair_type(elem) != DATA_TYPE_STRING) {
 795                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 796                                     "'%s' must be a string"), propname);
 797                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 798                                 goto error;
 799                         }
 800
 801                         if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
 802                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 803                                     "property name '%s' is too long"),
 804                                     propname);
 805                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 806                                 goto error;
 807                         }
 808
 809                         (void) nvpair_value_string(elem, &strval);
 810                         if (nvlist_add_string(ret, propname, strval) != 0) {
 811                                 (void) no_memory(hdl);
 812                                 goto error;
 813                         }
 814                         continue;
 815                 }
 816
 817                 /*
 818                  * Currently, only user properties can be modified on
 819                  * snapshots.
 820                  */
 821                 if (type == ZFS_TYPE_SNAPSHOT) {
 822                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 823                             "this property can not be modified for snapshots"));
 824                         (void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
 825                         goto error;
 826                 }
 827
 828                 if (prop == ZPROP_INVAL && zfs_prop_userquota(propname)) {
 829                         zfs_userquota_prop_t uqtype;
 830                         char newpropname[128];
 831                         char domain[128];
 832                         uint64_t rid;
 833                         uint64_t valary[3];
 834
 835                         if (userquota_propname_decode(propname, zoned,
 836                             &uqtype, domain, sizeof (domain), &rid) != 0) {
 837                                 zfs_error_aux(hdl,
 838                                     dgettext(TEXT_DOMAIN,
 839                                     "'%s' has an invalid user/group name"),
 840                                     propname);
 841                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 842                                 goto error;
 843                         }
 844
 845                         if (uqtype != ZFS_PROP_USERQUOTA &&
 846                             uqtype != ZFS_PROP_GROUPQUOTA) {
 847                                 zfs_error_aux(hdl,
 848                                     dgettext(TEXT_DOMAIN, "'%s' is readonly"),
 849                                     propname);
 850                                 (void) zfs_error(hdl, EZFS_PROPREADONLY,
 851                                     errbuf);
 852                                 goto error;
 853                         }
 854
 855                         if (nvpair_type(elem) == DATA_TYPE_STRING) {
 856                                 (void) nvpair_value_string(elem, &strval);
 857                                 if (strcmp(strval, "none") == 0) {
 858                                         intval = 0;
 859                                 } else if (zfs_nicestrtonum(hdl,
 860                                     strval, &intval) != 0) {
 861                                         (void) zfs_error(hdl,
 862                                             EZFS_BADPROP, errbuf);
 863                                         goto error;
 864                                 }
 865                         } else if (nvpair_type(elem) ==
 866                             DATA_TYPE_UINT64) {
 867                                 (void) nvpair_value_uint64(elem, &intval);
 868                                 if (intval == 0) {
 869                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 870                                             "use 'none' to disable "
 871                                             "userquota/groupquota"));
 872                                         goto error;
 873                                 }
 874                         } else {
 875                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 876                                     "'%s' must be a number"), propname);
 877                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 878                                 goto error;
 879                         }
 880
 881                         (void) snprintf(newpropname, sizeof (newpropname),
 882                             "%s%s", zfs_userquota_prop_prefixes[uqtype],
 883                             domain);
 884                         valary[0] = uqtype;
 885                         valary[1] = rid;
 886                         valary[2] = intval;
 887                         if (nvlist_add_uint64_array(ret, newpropname,
 888                             valary, 3) != 0) {
 889                                 (void) no_memory(hdl);
 890                                 goto error;
 891                         }
 892                         continue;
 893                 }
 894
 895                 if (prop == ZPROP_INVAL) {
 896                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 897                             "invalid property '%s'"), propname);
 898                         (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 899                         goto error;
 900                 }
 901
 902                 if (!zfs_prop_valid_for_type(prop, type)) {
 903                         zfs_error_aux(hdl,
 904                             dgettext(TEXT_DOMAIN, "'%s' does not "
 905                             "apply to datasets of this type"), propname);
 906                         (void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
 907                         goto error;
 908                 }
 909
 910                 if (zfs_prop_readonly(prop) &&
 911                     (!zfs_prop_setonce(prop) || zhp != NULL)) {
 912                         zfs_error_aux(hdl,
 913                             dgettext(TEXT_DOMAIN, "'%s' is readonly"),
 914                             propname);
 915                         (void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
 916                         goto error;
 917                 }
 918
 919                 if (zprop_parse_value(hdl, elem, prop, type, ret,
 920                     &strval, &intval, errbuf) != 0)
 921                         goto error;
 922
 923                 /*
 924                  * Perform some additional checks for specific properties.
 925                  */
 926                 switch (prop) {
 927                 case ZFS_PROP_VERSION:
 928                 {
 929                         int version;
 930
 931                         if (zhp == NULL)
 932                                 break;
 933                         version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
 934                         if (intval < version) {
 935                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 936                                     "Can not downgrade; already at version %u"),
 937                                     version);
 938                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 939                                 goto error;
 940                         }
 941                         break;
 942                 }
 943
 944                 case ZFS_PROP_RECORDSIZE:
 945                 case ZFS_PROP_VOLBLOCKSIZE:
 946                         /* must be power of two within SPA_{MIN,MAX}BLOCKSIZE */
 947                         if (intval < SPA_MINBLOCKSIZE ||
 948                             intval > SPA_MAXBLOCKSIZE || !ISP2(intval)) {
 949                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 950                                     "'%s' must be power of 2 from %u "
 951                                     "to %uk"), propname,
 952                                     (uint_t)SPA_MINBLOCKSIZE,
 953                                     (uint_t)SPA_MAXBLOCKSIZE >> 10);
 954                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 955                                 goto error;
 956                         }
 957                         break;
 958
 959                 case ZFS_PROP_SHAREISCSI:
 960                         if (strcmp(strval, "off") != 0 &&
 961                             strcmp(strval, "on") != 0 &&
 962                             strcmp(strval, "type=disk") != 0) {
 963                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 964                                     "'%s' must be 'on', 'off', or 'type=disk'"),
 965                                     propname);
 966                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 967                                 goto error;
 968                         }
 969
 970                         break;
 971
 972                 case ZFS_PROP_MOUNTPOINT:
 973                 {
 974                         namecheck_err_t why;
 975
 976                         if (strcmp(strval, ZFS_MOUNTPOINT_NONE) == 0 ||
 977                             strcmp(strval, ZFS_MOUNTPOINT_LEGACY) == 0)
 978                                 break;
 979
 980                         if (mountpoint_namecheck(strval, &why)) {
 981                                 switch (why) {
 982                                 case NAME_ERR_LEADING_SLASH:
 983                                         zfs_error_aux(hdl,
 984                                             dgettext(TEXT_DOMAIN,
 985                                             "'%s' must be an absolute path, "
 986                                             "'none', or 'legacy'"), propname);
 987                                         break;
 988                                 case NAME_ERR_TOOLONG:
 989                                         zfs_error_aux(hdl,
 990                                             dgettext(TEXT_DOMAIN,
 991                                             "component of '%s' is too long"),
 992                                             propname);
 993                                         break;
 994                                 }
 995                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 996                                 goto error;
 997                         }
 998                 }
 999
1000                         /*FALLTHRU*/
1001
1002                 case ZFS_PROP_SHARESMB:
1003                 case ZFS_PROP_SHARENFS:
1004                         /*
1005                          * For the mountpoint and sharenfs or sharesmb
1006                          * properties, check if it can be set in a
1007                          * global/non-global zone based on
1008                          * the zoned property value:
1009                          *
1010                          *              global zone         non-global zone
1011                          * --------------------------------------------------
1012                          * zoned=on     mountpoint (no)     mountpoint (yes)
1013                          *              sharenfs (no)       sharenfs (no)
1014                          *              sharesmb (no)       sharesmb (no)
1015                          *
1016                          * zoned=off    mountpoint (yes)        N/A
1017                          *              sharenfs (yes)
1018                          *              sharesmb (yes)
1019                          */
1020                         if (zoned) {
1021                                 if (getzoneid() == GLOBAL_ZONEID) {
1022                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1023                                             "'%s' cannot be set on "
1024                                             "dataset in a non-global zone"),
1025                                             propname);
1026                                         (void) zfs_error(hdl, EZFS_ZONED,
1027                                             errbuf);
1028                                         goto error;
1029                                 } else if (prop == ZFS_PROP_SHARENFS ||
1030                                     prop == ZFS_PROP_SHARESMB) {
1031                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1032                                             "'%s' cannot be set in "
1033                                             "a non-global zone"), propname);
1034                                         (void) zfs_error(hdl, EZFS_ZONED,
1035                                             errbuf);
1036                                         goto error;
1037                                 }
1038                         } else if (getzoneid() != GLOBAL_ZONEID) {
1039                                 /*
1040                                  * If zoned property is 'off', this must be in
1041                                  * a global zone. If not, something is wrong.
1042                                  */
1043                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1044                                     "'%s' cannot be set while dataset "
1045                                     "'zoned' property is set"), propname);
1046                                 (void) zfs_error(hdl, EZFS_ZONED, errbuf);
1047                                 goto error;
1048                         }
1049
1050                         /*
1051                          * At this point, it is legitimate to set the
1052                          * property. Now we want to make sure that the
1053                          * property value is valid if it is sharenfs.
1054                          */
1055                         if ((prop == ZFS_PROP_SHARENFS ||
1056                             prop == ZFS_PROP_SHARESMB) &&
1057                             strcmp(strval, "on") != 0 &&
1058                             strcmp(strval, "off") != 0) {
1059                                 zfs_share_proto_t proto;
1060
1061                                 if (prop == ZFS_PROP_SHARESMB)
1062                                         proto = PROTO_SMB;
1063                                 else
1064                                         proto = PROTO_NFS;
1065
1066                                 /*
1067                                  * Must be an valid sharing protocol
1068                                  * option string so init the libshare
1069                                  * in order to enable the parser and
1070                                  * then parse the options. We use the
1071                                  * control API since we don't care about
1072                                  * the current configuration and don't
1073                                  * want the overhead of loading it
1074                                  * until we actually do something.
1075                                  */
1076
1077                                 if (zfs_init_libshare(hdl,
1078                                     SA_INIT_CONTROL_API) != SA_OK) {
1079                                         /*
1080                                          * An error occurred so we can't do
1081                                          * anything
1082                                          */
1083                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1084                                             "'%s' cannot be set: problem "
1085                                             "in share initialization"),
1086                                             propname);
1087                                         (void) zfs_error(hdl, EZFS_BADPROP,
1088                                             errbuf);
1089                                         goto error;
1090                                 }
1091
1092                                 if (zfs_parse_options(strval, proto) != SA_OK) {
1093                                         /*
1094                                          * There was an error in parsing so
1095                                          * deal with it by issuing an error
1096                                          * message and leaving after
1097                                          * uninitializing the the libshare
1098                                          * interface.
1099                                          */
1100                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1101                                             "'%s' cannot be set to invalid "
1102                                             "options"), propname);
1103                                         (void) zfs_error(hdl, EZFS_BADPROP,
1104                                             errbuf);
1105                                         zfs_uninit_libshare(hdl);
1106                                         goto error;
1107                                 }
1108                                 zfs_uninit_libshare(hdl);
1109                         }
1110
1111                         break;
1112                 case ZFS_PROP_UTF8ONLY:
1113                         chosen_utf = (int)intval;
1114                         break;
1115                 case ZFS_PROP_NORMALIZE:
1116                         chosen_normal = (int)intval;
1117                         break;
1118                 }
1119
1120                 /*
1121                  * For changes to existing volumes, we have some additional
1122                  * checks to enforce.
1123                  */
1124                 if (type == ZFS_TYPE_VOLUME && zhp != NULL) {
1125                         uint64_t volsize = zfs_prop_get_int(zhp,
1126                             ZFS_PROP_VOLSIZE);
1127                         uint64_t blocksize = zfs_prop_get_int(zhp,
1128                             ZFS_PROP_VOLBLOCKSIZE);
1129                         char buf[64];
1130
1131                         switch (prop) {
1132                         case ZFS_PROP_RESERVATION:
1133                         case ZFS_PROP_REFRESERVATION:
1134                                 if (intval > volsize) {
1135                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1136                                             "'%s' is greater than current "
1137                                             "volume size"), propname);
1138                                         (void) zfs_error(hdl, EZFS_BADPROP,
1139                                             errbuf);
1140                                         goto error;
1141                                 }
1142                                 break;
1143
1144                         case ZFS_PROP_VOLSIZE:
1145                                 if (intval % blocksize != 0) {
1146                                         zfs_nicenum(blocksize, buf,
1147                                             sizeof (buf));
1148                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1149                                             "'%s' must be a multiple of "
1150                                             "volume block size (%s)"),
1151                                             propname, buf);
1152                                         (void) zfs_error(hdl, EZFS_BADPROP,
1153                                             errbuf);
1154                                         goto error;
1155                                 }
1156
1157                                 if (intval == 0) {
1158                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1159                                             "'%s' cannot be zero"),
1160                                             propname);
1161                                         (void) zfs_error(hdl, EZFS_BADPROP,
1162                                             errbuf);
1163                                         goto error;
1164                                 }
1165                                 break;
1166                         }
1167                 }
1168         }
1169
1170         /*
1171          * If normalization was chosen, but no UTF8 choice was made,
1172          * enforce rejection of non-UTF8 names.
1173          *
1174          * If normalization was chosen, but rejecting non-UTF8 names
1175          * was explicitly not chosen, it is an error.
1176          */
1177         if (chosen_normal > 0 && chosen_utf < 0) {
1178                 if (nvlist_add_uint64(ret,
1179                     zfs_prop_to_name(ZFS_PROP_UTF8ONLY), 1) != 0) {
1180                         (void) no_memory(hdl);
1181                         goto error;
1182                 }
1183         } else if (chosen_normal > 0 && chosen_utf == 0) {
1184                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1185                     "'%s' must be set 'on' if normalization chosen"),
1186                     zfs_prop_to_name(ZFS_PROP_UTF8ONLY));
1187                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1188                 goto error;
1189         }
1190
1191         /*
1192          * If this is an existing volume, and someone is setting the volsize,
1193          * make sure that it matches the reservation, or add it if necessary.
1194          */
1195         if (zhp != NULL && type == ZFS_TYPE_VOLUME &&
1196             nvlist_lookup_uint64(ret, zfs_prop_to_name(ZFS_PROP_VOLSIZE),
1197             &intval) == 0) {
1198                 uint64_t old_volsize = zfs_prop_get_int(zhp,
1199                     ZFS_PROP_VOLSIZE);
1200                 uint64_t old_reservation;
1201                 uint64_t new_reservation;
1202                 zfs_prop_t resv_prop;
1203
1204                 if (zfs_which_resv_prop(zhp, &resv_prop) < 0)
1205                         goto error;
1206                 old_reservation = zfs_prop_get_int(zhp, resv_prop);
1207
1208                 if (old_volsize == old_reservation &&
1209                     nvlist_lookup_uint64(ret, zfs_prop_to_name(resv_prop),
1210                     &new_reservation) != 0) {
1211                         if (nvlist_add_uint64(ret,
1212                             zfs_prop_to_name(resv_prop), intval) != 0) {
1213                                 (void) no_memory(hdl);
1214                                 goto error;
1215                         }
1216                 }
1217         }
1218         return (ret);
1219
1220 error:
1221         nvlist_free(ret);
1222         return (NULL);
1223 }
1224
1225 /*
1226  * Given a property name and value, set the property for the given dataset.
1227  */
1228 int
1229 zfs_prop_set(zfs_handle_t *zhp, const char *propname, const char *propval)
1230 {
1231         zfs_cmd_t zc = { 0 };
1232         int ret = -1;
1233         prop_changelist_t *cl = NULL;
1234         char errbuf[1024];
1235         libzfs_handle_t *hdl = zhp->zfs_hdl;
1236         nvlist_t *nvl = NULL, *realprops;
1237         zfs_prop_t prop;
1238         boolean_t do_prefix;
1239         uint64_t idx;
1240
1241         (void) snprintf(errbuf, sizeof (errbuf),
1242             dgettext(TEXT_DOMAIN, "cannot set property for '%s'"),
1243             zhp->zfs_name);
1244
1245         if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0 ||
1246             nvlist_add_string(nvl, propname, propval) != 0) {
1247                 (void) no_memory(hdl);
1248                 goto error;
1249         }
1250
1251         if ((realprops = zfs_valid_proplist(hdl, zhp->zfs_type, nvl,
1252             zfs_prop_get_int(zhp, ZFS_PROP_ZONED), zhp, errbuf)) == NULL)
1253                 goto error;
1254
1255         nvlist_free(nvl);
1256         nvl = realprops;
1257
1258         prop = zfs_name_to_prop(propname);
1259
1260         /* We don't support those properties on FreeBSD. */
1261         switch (prop) {
1262         case ZFS_PROP_DEVICES:
1263         case ZFS_PROP_SHAREISCSI:
1264         case ZFS_PROP_ISCSIOPTIONS:
1265         case ZFS_PROP_XATTR:
1266         case ZFS_PROP_VSCAN:
1267         case ZFS_PROP_NBMAND:
1268                 (void) snprintf(errbuf, sizeof (errbuf),
1269                     "property '%s' not supported on FreeBSD", propname);
1270                 ret = zfs_error(hdl, EZFS_PERM, errbuf);
1271                 goto error;
1272         }
1273
1274         if ((cl = changelist_gather(zhp, prop, 0, 0)) == NULL)
1275                 goto error;
1276
1277         if (prop == ZFS_PROP_MOUNTPOINT && changelist_haszonedchild(cl)) {
1278                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1279                     "child dataset with inherited mountpoint is used "
1280                     "in a non-global zone"));
1281                 ret = zfs_error(hdl, EZFS_ZONED, errbuf);
1282                 goto error;
1283         }
1284
1285         /*
1286          * If the dataset's canmount property is being set to noauto,
1287          * then we want to prevent unmounting & remounting it.
1288          */
1289         do_prefix = !((prop == ZFS_PROP_CANMOUNT) &&
1290             (zprop_string_to_index(prop, propval, &idx,
1291             ZFS_TYPE_DATASET) == 0) && (idx == ZFS_CANMOUNT_NOAUTO));
1292
1293         if (do_prefix && (ret = changelist_prefix(cl)) != 0)
1294                 goto error;
1295
1296         /*
1297          * Execute the corresponding ioctl() to set this property.
1298          */
1299         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1300
1301         if (zcmd_write_src_nvlist(hdl, &zc, nvl) != 0)
1302                 goto error;
1303
1304         ret = zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc);
1305
1306         if (ret != 0) {
1307                 switch (errno) {
1308
1309                 case ENOSPC:
1310                         /*
1311                          * For quotas and reservations, ENOSPC indicates
1312                          * something different; setting a quota or reservation
1313                          * doesn't use any disk space.
1314                          */
1315                         switch (prop) {
1316                         case ZFS_PROP_QUOTA:
1317                         case ZFS_PROP_REFQUOTA:
1318                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1319                                     "size is less than current used or "
1320                                     "reserved space"));
1321                                 (void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
1322                                 break;
1323
1324                         case ZFS_PROP_RESERVATION:
1325                         case ZFS_PROP_REFRESERVATION:
1326                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1327                                     "size is greater than available space"));
1328                                 (void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
1329                                 break;
1330
1331                         default:
1332                                 (void) zfs_standard_error(hdl, errno, errbuf);
1333                                 break;
1334                         }
1335                         break;
1336
1337                 case EBUSY:
1338                         if (prop == ZFS_PROP_VOLBLOCKSIZE)
1339                                 (void) zfs_error(hdl, EZFS_VOLHASDATA, errbuf);
1340                         else
1341                                 (void) zfs_standard_error(hdl, EBUSY, errbuf);
1342                         break;
1343
1344                 case EROFS:
1345                         (void) zfs_error(hdl, EZFS_DSREADONLY, errbuf);
1346                         break;
1347
1348                 case ENOTSUP:
1349                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1350                             "pool and or dataset must be upgraded to set this "
1351                             "property or value"));
1352                         (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
1353                         break;
1354
1355                 case ERANGE:
1356                         if (prop == ZFS_PROP_COMPRESSION) {
1357                                 (void) zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1358                                     "property setting is not allowed on "
1359                                     "bootable datasets"));
1360                                 (void) zfs_error(hdl, EZFS_NOTSUP, errbuf);
1361                         } else {
1362                                 (void) zfs_standard_error(hdl, errno, errbuf);
1363                         }
1364                         break;
1365
1366                 case EOVERFLOW:
1367                         /*
1368                          * This platform can't address a volume this big.
1369                          */
1370 #ifdef _ILP32
1371                         if (prop == ZFS_PROP_VOLSIZE) {
1372                                 (void) zfs_error(hdl, EZFS_VOLTOOBIG, errbuf);
1373                                 break;
1374                         }
1375 #endif
1376                         /* FALLTHROUGH */
1377                 default:
1378                         (void) zfs_standard_error(hdl, errno, errbuf);
1379                 }
1380         } else {
1381                 if (do_prefix)
1382                         ret = changelist_postfix(cl);
1383
1384                 /*
1385                  * Refresh the statistics so the new property value
1386                  * is reflected.
1387                  */
1388                 if (ret == 0)
1389                         (void) get_stats(zhp);
1390         }
1391
1392 error:
1393         nvlist_free(nvl);
1394         zcmd_free_nvlists(&zc);
1395         if (cl)
1396                 changelist_free(cl);
1397         return (ret);
1398 }
1399
1400 /*
1401  * Given a property, inherit the value from the parent dataset.
1402  */
1403 int
1404 zfs_prop_inherit(zfs_handle_t *zhp, const char *propname)
1405 {
1406         zfs_cmd_t zc = { 0 };
1407         int ret;
1408         prop_changelist_t *cl;
1409         libzfs_handle_t *hdl = zhp->zfs_hdl;
1410         char errbuf[1024];
1411         zfs_prop_t prop;
1412
1413         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1414             "cannot inherit %s for '%s'"), propname, zhp->zfs_name);
1415
1416         if ((prop = zfs_name_to_prop(propname)) == ZPROP_INVAL) {
1417                 /*
1418                  * For user properties, the amount of work we have to do is very
1419                  * small, so just do it here.
1420                  */
1421                 if (!zfs_prop_user(propname)) {
1422                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1423                             "invalid property"));
1424                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
1425                 }
1426
1427                 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1428                 (void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));
1429
1430                 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_INHERIT_PROP, &zc) != 0)
1431                         return (zfs_standard_error(hdl, errno, errbuf));
1432
1433                 return (0);
1434         }
1435
1436         /*
1437          * Verify that this property is inheritable.
1438          */
1439         if (zfs_prop_readonly(prop))
1440                 return (zfs_error(hdl, EZFS_PROPREADONLY, errbuf));
1441
1442         if (!zfs_prop_inheritable(prop))
1443                 return (zfs_error(hdl, EZFS_PROPNONINHERIT, errbuf));
1444
1445         /*
1446          * Check to see if the value applies to this type
1447          */
1448         if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
1449                 return (zfs_error(hdl, EZFS_PROPTYPE, errbuf));
1450
1451         /*
1452          * Normalize the name, to get rid of shorthand abbrevations.
1453          */
1454         propname = zfs_prop_to_name(prop);
1455         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1456         (void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));
1457
1458         if (prop == ZFS_PROP_MOUNTPOINT && getzoneid() == GLOBAL_ZONEID &&
1459             zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) {
1460                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1461                     "dataset is used in a non-global zone"));
1462                 return (zfs_error(hdl, EZFS_ZONED, errbuf));
1463         }
1464
1465         /*
1466          * Determine datasets which will be affected by this change, if any.
1467          */
1468         if ((cl = changelist_gather(zhp, prop, 0, 0)) == NULL)
1469                 return (-1);
1470
1471         if (prop == ZFS_PROP_MOUNTPOINT && changelist_haszonedchild(cl)) {
1472                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1473                     "child dataset with inherited mountpoint is used "
1474                     "in a non-global zone"));
1475                 ret = zfs_error(hdl, EZFS_ZONED, errbuf);
1476                 goto error;
1477         }
1478
1479         if ((ret = changelist_prefix(cl)) != 0)
1480                 goto error;
1481
1482         if ((ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_INHERIT_PROP, &zc)) != 0) {
1483                 return (zfs_standard_error(hdl, errno, errbuf));
1484         } else {
1485
1486                 if ((ret = changelist_postfix(cl)) != 0)
1487                         goto error;
1488
1489                 /*
1490                  * Refresh the statistics so the new property is reflected.
1491                  */
1492                 (void) get_stats(zhp);
1493         }
1494
1495 error:
1496         changelist_free(cl);
1497         return (ret);
1498 }
1499
1500 /*
1501  * True DSL properties are stored in an nvlist.  The following two functions
1502  * extract them appropriately.
1503  */
1504 static uint64_t
1505 getprop_uint64(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
1506 {
1507         nvlist_t *nv;
1508         uint64_t value;
1509
1510         *source = NULL;
1511         if (nvlist_lookup_nvlist(zhp->zfs_props,
1512             zfs_prop_to_name(prop), &nv) == 0) {
1513                 verify(nvlist_lookup_uint64(nv, ZPROP_VALUE, &value) == 0);
1514                 (void) nvlist_lookup_string(nv, ZPROP_SOURCE, source);
1515         } else {
1516                 verify(!zhp->zfs_props_table ||
1517                     zhp->zfs_props_table[prop] == B_TRUE);
1518                 value = zfs_prop_default_numeric(prop);
1519                 *source = "";
1520         }
1521
1522         return (value);
1523 }
1524
1525 static char *
1526 getprop_string(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
1527 {
1528         nvlist_t *nv;
1529         char *value;
1530
1531         *source = NULL;
1532         if (nvlist_lookup_nvlist(zhp->zfs_props,
1533             zfs_prop_to_name(prop), &nv) == 0) {
1534                 verify(nvlist_lookup_string(nv, ZPROP_VALUE, &value) == 0);
1535                 (void) nvlist_lookup_string(nv, ZPROP_SOURCE, source);
1536         } else {
1537                 verify(!zhp->zfs_props_table ||
1538                     zhp->zfs_props_table[prop] == B_TRUE);
1539                 if ((value = (char *)zfs_prop_default_string(prop)) == NULL)
1540                         value = "";
1541                 *source = "";
1542         }
1543
1544         return (value);
1545 }
1546
1547 /*
1548  * Internal function for getting a numeric property.  Both zfs_prop_get() and
1549  * zfs_prop_get_int() are built using this interface.
1550  *
1551  * Certain properties can be overridden using 'mount -o'.  In this case, scan
1552  * the contents of the /etc/mnttab entry, searching for the appropriate options.
1553  * If they differ from the on-disk values, report the current values and mark
1554  * the source "temporary".
1555  */
1556 static int
1557 get_numeric_property(zfs_handle_t *zhp, zfs_prop_t prop, zprop_source_t *src,
1558     char **source, uint64_t *val)
1559 {
1560         zfs_cmd_t zc = { 0 };
1561         nvlist_t *zplprops = NULL;
1562         struct mnttab mnt;
1563         char *mntopt_on = NULL;
1564         char *mntopt_off = NULL;
1565
1566         *source = NULL;
1567
1568         switch (prop) {
1569         case ZFS_PROP_ATIME:
1570                 mntopt_on = MNTOPT_ATIME;
1571                 mntopt_off = MNTOPT_NOATIME;
1572                 break;
1573
1574         case ZFS_PROP_DEVICES:
1575                 mntopt_on = MNTOPT_DEVICES;
1576                 mntopt_off = MNTOPT_NODEVICES;
1577                 break;
1578
1579         case ZFS_PROP_EXEC:
1580                 mntopt_on = MNTOPT_EXEC;
1581                 mntopt_off = MNTOPT_NOEXEC;
1582                 break;
1583
1584         case ZFS_PROP_READONLY:
1585                 mntopt_on = MNTOPT_RO;
1586                 mntopt_off = MNTOPT_RW;
1587                 break;
1588
1589         case ZFS_PROP_SETUID:
1590                 mntopt_on = MNTOPT_SETUID;
1591                 mntopt_off = MNTOPT_NOSETUID;
1592                 break;
1593
1594         case ZFS_PROP_XATTR:
1595                 mntopt_on = MNTOPT_XATTR;
1596                 mntopt_off = MNTOPT_NOXATTR;
1597                 break;
1598
1599         case ZFS_PROP_NBMAND:
1600                 mntopt_on = MNTOPT_NBMAND;
1601                 mntopt_off = MNTOPT_NONBMAND;
1602                 break;
1603         }
1604
1605         /*
1606          * Because looking up the mount options is potentially expensive
1607          * (iterating over all of /etc/mnttab), we defer its calculation until
1608          * we're looking up a property which requires its presence.
1609          */
1610         if (!zhp->zfs_mntcheck &&
1611             (mntopt_on != NULL || prop == ZFS_PROP_MOUNTED)) {
1612                 libzfs_handle_t *hdl = zhp->zfs_hdl;
1613                 struct mnttab entry;
1614
1615                 if (libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0) {
1616                         zhp->zfs_mntopts = zfs_strdup(hdl,
1617                             entry.mnt_mntopts);
1618                         if (zhp->zfs_mntopts == NULL)
1619                                 return (-1);
1620                 }
1621
1622                 zhp->zfs_mntcheck = B_TRUE;
1623         }
1624
1625         if (zhp->zfs_mntopts == NULL)
1626                 mnt.mnt_mntopts = "";
1627         else
1628                 mnt.mnt_mntopts = zhp->zfs_mntopts;
1629
1630         switch (prop) {
1631         case ZFS_PROP_ATIME:
1632         case ZFS_PROP_DEVICES:
1633         case ZFS_PROP_EXEC:
1634         case ZFS_PROP_READONLY:
1635         case ZFS_PROP_SETUID:
1636         case ZFS_PROP_XATTR:
1637         case ZFS_PROP_NBMAND:
1638                 *val = getprop_uint64(zhp, prop, source);
1639
1640                 if (hasmntopt(&mnt, mntopt_on) && !*val) {
1641                         *val = B_TRUE;
1642                         if (src)
1643                                 *src = ZPROP_SRC_TEMPORARY;
1644                 } else if (hasmntopt(&mnt, mntopt_off) && *val) {
1645                         *val = B_FALSE;
1646                         if (src)
1647                                 *src = ZPROP_SRC_TEMPORARY;
1648                 }
1649                 break;
1650
1651         case ZFS_PROP_CANMOUNT:
1652                 *val = getprop_uint64(zhp, prop, source);
1653                 if (*val != ZFS_CANMOUNT_ON)
1654                         *source = zhp->zfs_name;
1655                 else
1656                         *source = "";   /* default */
1657                 break;
1658
1659         case ZFS_PROP_QUOTA:
1660         case ZFS_PROP_REFQUOTA:
1661         case ZFS_PROP_RESERVATION:
1662         case ZFS_PROP_REFRESERVATION:
1663                 *val = getprop_uint64(zhp, prop, source);
1664                 if (*val == 0)
1665                         *source = "";   /* default */
1666                 else
1667                         *source = zhp->zfs_name;
1668                 break;
1669
1670         case ZFS_PROP_MOUNTED:
1671                 *val = (zhp->zfs_mntopts != NULL);
1672                 break;
1673
1674         case ZFS_PROP_NUMCLONES:
1675                 *val = zhp->zfs_dmustats.dds_num_clones;
1676                 break;
1677
1678         case ZFS_PROP_VERSION:
1679         case ZFS_PROP_NORMALIZE:
1680         case ZFS_PROP_UTF8ONLY:
1681         case ZFS_PROP_CASE:
1682                 if (!zfs_prop_valid_for_type(prop, zhp->zfs_head_type) ||
1683                     zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
1684                         return (-1);
1685                 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1686                 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_OBJSET_ZPLPROPS, &zc)) {
1687                         zcmd_free_nvlists(&zc);
1688                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
1689                             "unable to get %s property"),
1690                             zfs_prop_to_name(prop));
1691                         return (zfs_error(zhp->zfs_hdl, EZFS_BADVERSION,
1692                             dgettext(TEXT_DOMAIN, "internal error")));
1693                 }
1694                 if (zcmd_read_dst_nvlist(zhp->zfs_hdl, &zc, &zplprops) != 0 ||
1695                     nvlist_lookup_uint64(zplprops, zfs_prop_to_name(prop),
1696                     val) != 0) {
1697                         zcmd_free_nvlists(&zc);
1698                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
1699                             "unable to get %s property"),
1700                             zfs_prop_to_name(prop));
1701                         return (zfs_error(zhp->zfs_hdl, EZFS_NOMEM,
1702                             dgettext(TEXT_DOMAIN, "internal error")));
1703                 }
1704                 if (zplprops)
1705                         nvlist_free(zplprops);
1706                 zcmd_free_nvlists(&zc);
1707                 break;
1708
1709         default:
1710                 switch (zfs_prop_get_type(prop)) {
1711                 case PROP_TYPE_NUMBER:
1712                 case PROP_TYPE_INDEX:
1713                         *val = getprop_uint64(zhp, prop, source);
1714                         /*
1715                          * If we tried to use a default value for a
1716                          * readonly property, it means that it was not
1717                          * present; return an error.
1718                          */
1719                         if (zfs_prop_readonly(prop) &&
1720                             *source && (*source)[0] == '\0') {
1721                                 return (-1);
1722                         }
1723                         break;
1724
1725                 case PROP_TYPE_STRING:
1726                 default:
1727                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
1728                             "cannot get non-numeric property"));
1729                         return (zfs_error(zhp->zfs_hdl, EZFS_BADPROP,
1730                             dgettext(TEXT_DOMAIN, "internal error")));
1731                 }
1732         }
1733
1734         return (0);
1735 }
1736
1737 /*
1738  * Calculate the source type, given the raw source string.
1739  */
1740 static void
1741 get_source(zfs_handle_t *zhp, zprop_source_t *srctype, char *source,
1742     char *statbuf, size_t statlen)
1743 {
1744         if (statbuf == NULL || *srctype == ZPROP_SRC_TEMPORARY)
1745                 return;
1746
1747         if (source == NULL) {
1748                 *srctype = ZPROP_SRC_NONE;
1749         } else if (source[0] == '\0') {
1750                 *srctype = ZPROP_SRC_DEFAULT;
1751         } else {
1752                 if (strcmp(source, zhp->zfs_name) == 0) {
1753                         *srctype = ZPROP_SRC_LOCAL;
1754                 } else {
1755                         (void) strlcpy(statbuf, source, statlen);
1756                         *srctype = ZPROP_SRC_INHERITED;
1757                 }
1758         }
1759
1760 }
1761
1762 /*
1763  * Retrieve a property from the given object.  If 'literal' is specified, then
1764  * numbers are left as exact values.  Otherwise, numbers are converted to a
1765  * human-readable form.
1766  *
1767  * Returns 0 on success, or -1 on error.
1768  */
1769 int
1770 zfs_prop_get(zfs_handle_t *zhp, zfs_prop_t prop, char *propbuf, size_t proplen,
1771     zprop_source_t *src, char *statbuf, size_t statlen, boolean_t literal)
1772 {
1773         char *source = NULL;
1774         uint64_t val;
1775         char *str;
1776         const char *strval;
1777
1778         /*
1779          * Check to see if this property applies to our object
1780          */
1781         if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
1782                 return (-1);
1783
1784         if (src)
1785                 *src = ZPROP_SRC_NONE;
1786
1787         switch (prop) {
1788         case ZFS_PROP_CREATION:
1789                 /*
1790                  * 'creation' is a time_t stored in the statistics.  We convert
1791                  * this into a string unless 'literal' is specified.
1792                  */
1793                 {
1794                         val = getprop_uint64(zhp, prop, &source);
1795                         time_t time = (time_t)val;
1796                         struct tm t;
1797
1798                         if (literal ||
1799                             localtime_r(&time, &t) == NULL ||
1800                             strftime(propbuf, proplen, "%a %b %e %k:%M %Y",
1801                             &t) == 0)
1802                                 (void) snprintf(propbuf, proplen, "%llu", val);
1803                 }
1804                 break;
1805
1806         case ZFS_PROP_MOUNTPOINT:
1807                 /*
1808                  * Getting the precise mountpoint can be tricky.
1809                  *
1810                  *  - for 'none' or 'legacy', return those values.
1811                  *  - for inherited mountpoints, we want to take everything
1812                  *    after our ancestor and append it to the inherited value.
1813                  *
1814                  * If the pool has an alternate root, we want to prepend that
1815                  * root to any values we return.
1816                  */
1817
1818                 str = getprop_string(zhp, prop, &source);
1819
1820                 if (str[0] == '/') {
1821                         char buf[MAXPATHLEN];
1822                         char *root = buf;
1823                         const char *relpath = zhp->zfs_name + strlen(source);
1824
1825                         if (relpath[0] == '/')
1826                                 relpath++;
1827
1828                         if ((zpool_get_prop(zhp->zpool_hdl,
1829                             ZPOOL_PROP_ALTROOT, buf, MAXPATHLEN, NULL)) ||
1830                             (strcmp(root, "-") == 0))
1831                                 root[0] = '\0';
1832                         /*
1833                          * Special case an alternate root of '/'. This will
1834                          * avoid having multiple leading slashes in the
1835                          * mountpoint path.
1836                          */
1837                         if (strcmp(root, "/") == 0)
1838                                 root++;
1839
1840                         /*
1841                          * If the mountpoint is '/' then skip over this
1842                          * if we are obtaining either an alternate root or
1843                          * an inherited mountpoint.
1844                          */
1845                         if (str[1] == '\0' && (root[0] != '\0' ||
1846                             relpath[0] != '\0'))
1847                                 str++;
1848
1849                         if (relpath[0] == '\0')
1850                                 (void) snprintf(propbuf, proplen, "%s%s",
1851                                     root, str);
1852                         else
1853                                 (void) snprintf(propbuf, proplen, "%s%s%s%s",
1854                                     root, str, relpath[0] == '@' ? "" : "/",
1855                                     relpath);
1856                 } else {
1857                         /* 'legacy' or 'none' */
1858                         (void) strlcpy(propbuf, str, proplen);
1859                 }
1860
1861                 break;
1862
1863         case ZFS_PROP_ORIGIN:
1864                 (void) strlcpy(propbuf, getprop_string(zhp, prop, &source),
1865                     proplen);
1866                 /*
1867                  * If there is no parent at all, return failure to indicate that
1868                  * it doesn't apply to this dataset.
1869                  */
1870                 if (propbuf[0] == '\0')
1871                         return (-1);
1872                 break;
1873
1874         case ZFS_PROP_QUOTA:
1875         case ZFS_PROP_REFQUOTA:
1876         case ZFS_PROP_RESERVATION:
1877         case ZFS_PROP_REFRESERVATION:
1878
1879                 if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
1880                         return (-1);
1881
1882                 /*
1883                  * If quota or reservation is 0, we translate this into 'none'
1884                  * (unless literal is set), and indicate that it's the default
1885                  * value.  Otherwise, we print the number nicely and indicate
1886                  * that its set locally.
1887                  */
1888                 if (val == 0) {
1889                         if (literal)
1890                                 (void) strlcpy(propbuf, "0", proplen);
1891                         else
1892                                 (void) strlcpy(propbuf, "none", proplen);
1893                 } else {
1894                         if (literal)
1895                                 (void) snprintf(propbuf, proplen, "%llu",
1896                                     (u_longlong_t)val);
1897                         else
1898                                 zfs_nicenum(val, propbuf, proplen);
1899                 }
1900                 break;
1901
1902         case ZFS_PROP_COMPRESSRATIO:
1903                 if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
1904                         return (-1);
1905                 (void) snprintf(propbuf, proplen, "%lld.%02lldx", (longlong_t)
1906                     val / 100, (longlong_t)val % 100);
1907                 break;
1908
1909         case ZFS_PROP_TYPE:
1910                 switch (zhp->zfs_type) {
1911                 case ZFS_TYPE_FILESYSTEM:
1912                         str = "filesystem";
1913                         break;
1914                 case ZFS_TYPE_VOLUME:
1915                         str = "volume";
1916                         break;
1917                 case ZFS_TYPE_SNAPSHOT:
1918                         str = "snapshot";
1919                         break;
1920                 default:
1921                         abort();
1922                 }
1923                 (void) snprintf(propbuf, proplen, "%s", str);
1924                 break;
1925
1926         case ZFS_PROP_MOUNTED:
1927                 /*
1928                  * The 'mounted' property is a pseudo-property that described
1929                  * whether the filesystem is currently mounted.  Even though
1930                  * it's a boolean value, the typical values of "on" and "off"
1931                  * don't make sense, so we translate to "yes" and "no".
1932                  */
1933                 if (get_numeric_property(zhp, ZFS_PROP_MOUNTED,
1934                     src, &source, &val) != 0)
1935                         return (-1);
1936                 if (val)
1937                         (void) strlcpy(propbuf, "yes", proplen);
1938                 else
1939                         (void) strlcpy(propbuf, "no", proplen);
1940                 break;
1941
1942         case ZFS_PROP_NAME:
1943                 /*
1944                  * The 'name' property is a pseudo-property derived from the
1945                  * dataset name.  It is presented as a real property to simplify
1946                  * consumers.
1947                  */
1948                 (void) strlcpy(propbuf, zhp->zfs_name, proplen);
1949                 break;
1950
1951         default:
1952                 switch (zfs_prop_get_type(prop)) {
1953                 case PROP_TYPE_NUMBER:
1954                         if (get_numeric_property(zhp, prop, src,
1955                             &source, &val) != 0)
1956                                 return (-1);
1957                         if (literal)
1958                                 (void) snprintf(propbuf, proplen, "%llu",
1959                                     (u_longlong_t)val);
1960                         else
1961                                 zfs_nicenum(val, propbuf, proplen);
1962                         break;
1963
1964                 case PROP_TYPE_STRING:
1965                         (void) strlcpy(propbuf,
1966                             getprop_string(zhp, prop, &source), proplen);
1967                         break;
1968
1969                 case PROP_TYPE_INDEX:
1970                         if (get_numeric_property(zhp, prop, src,
1971                             &source, &val) != 0)
1972                                 return (-1);
1973                         if (zfs_prop_index_to_string(prop, val, &strval) != 0)
1974                                 return (-1);
1975                         (void) strlcpy(propbuf, strval, proplen);
1976                         break;
1977
1978                 default:
1979                         abort();
1980                 }
1981         }
1982
1983         get_source(zhp, src, source, statbuf, statlen);
1984
1985         return (0);
1986 }
1987
1988 /*
1989  * Utility function to get the given numeric property.  Does no validation that
1990  * the given property is the appropriate type; should only be used with
1991  * hard-coded property types.
1992  */
1993 uint64_t
1994 zfs_prop_get_int(zfs_handle_t *zhp, zfs_prop_t prop)
1995 {
1996         char *source;
1997         uint64_t val;
1998
1999         (void) get_numeric_property(zhp, prop, NULL, &source, &val);
2000
2001         return (val);
2002 }
2003
2004 int
2005 zfs_prop_set_int(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t val)
2006 {
2007         char buf[64];
2008
2009         (void) snprintf(buf, sizeof (buf), "%llu", (longlong_t)val);
2010         return (zfs_prop_set(zhp, zfs_prop_to_name(prop), buf));
2011 }
2012
2013 /*
2014  * Similar to zfs_prop_get(), but returns the value as an integer.
2015  */
2016 int
2017 zfs_prop_get_numeric(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t *value,
2018     zprop_source_t *src, char *statbuf, size_t statlen)
2019 {
2020         char *source;
2021
2022         /*
2023          * Check to see if this property applies to our object
2024          */
2025         if (!zfs_prop_valid_for_type(prop, zhp->zfs_type)) {
2026                 return (zfs_error_fmt(zhp->zfs_hdl, EZFS_PROPTYPE,
2027                     dgettext(TEXT_DOMAIN, "cannot get property '%s'"),
2028                     zfs_prop_to_name(prop)));
2029         }
2030
2031         if (src)
2032                 *src = ZPROP_SRC_NONE;
2033
2034         if (get_numeric_property(zhp, prop, src, &source, value) != 0)
2035                 return (-1);
2036
2037         get_source(zhp, src, source, statbuf, statlen);
2038
2039         return (0);
2040 }
2041
2042 static int
2043 idmap_id_to_numeric_domain_rid(uid_t id, boolean_t isuser,
2044     char **domainp, idmap_rid_t *ridp)
2045 {
2046 #ifdef sun
2047         idmap_handle_t *idmap_hdl = NULL;
2048         idmap_get_handle_t *get_hdl = NULL;
2049         idmap_stat status;
2050         int err = EINVAL;
2051
2052         if (idmap_init(&idmap_hdl) != IDMAP_SUCCESS)
2053                 goto out;
2054         if (idmap_get_create(idmap_hdl, &get_hdl) != IDMAP_SUCCESS)
2055                 goto out;
2056
2057         if (isuser) {
2058                 err = idmap_get_sidbyuid(get_hdl, id,
2059                     IDMAP_REQ_FLG_USE_CACHE, domainp, ridp, &status);
2060         } else {
2061                 err = idmap_get_sidbygid(get_hdl, id,
2062                     IDMAP_REQ_FLG_USE_CACHE, domainp, ridp, &status);
2063         }
2064         if (err == IDMAP_SUCCESS &&
2065             idmap_get_mappings(get_hdl) == IDMAP_SUCCESS &&
2066             status == IDMAP_SUCCESS)
2067                 err = 0;
2068         else
2069                 err = EINVAL;
2070 out:
2071         if (get_hdl)
2072                 idmap_get_destroy(get_hdl);
2073         if (idmap_hdl)
2074                 (void) idmap_fini(idmap_hdl);
2075         return (err);
2076 #else   /* !sun */
2077         assert(!"invalid code path");
2078 #endif  /* !sun */
2079 }
2080
2081 #ifndef sun
2082 /* Check if a string contains only digits */
2083 static int
2084 string_is_digits(char *cp)
2085 {
2086         int i;
2087
2088         for(i = 0; i < strlen(cp); i++)
2089             if(!isdigit(cp[i]))
2090                 return (0);
2091         return (1);
2092 }
2093
2094 #endif  /* !sun */
2095
2096 /*
2097  * convert the propname into parameters needed by kernel
2098  * Eg: userquota@ahrens -> ZFS_PROP_USERQUOTA, "", 126829
2099  * Eg: userused@matt@domain -> ZFS_PROP_USERUSED, "S-1-123-456", 789
2100  */
2101 static int
2102 userquota_propname_decode(const char *propname, boolean_t zoned,
2103     zfs_userquota_prop_t *typep, char *domain, int domainlen, uint64_t *ridp)
2104 {
2105         zfs_userquota_prop_t type;
2106         char *cp, *end;
2107         char *numericsid = NULL;
2108         boolean_t isuser;
2109
2110         domain[0] = '\0';
2111
2112         /* Figure out the property type ({user|group}{quota|space}) */
2113         for (type = 0; type < ZFS_NUM_USERQUOTA_PROPS; type++) {
2114                 if (strncmp(propname, zfs_userquota_prop_prefixes[type],
2115                     strlen(zfs_userquota_prop_prefixes[type])) == 0)
2116                         break;
2117         }
2118         if (type == ZFS_NUM_USERQUOTA_PROPS)
2119                 return (EINVAL);
2120         *typep = type;
2121
2122         isuser = (type == ZFS_PROP_USERQUOTA ||
2123             type == ZFS_PROP_USERUSED);
2124
2125         cp = strchr(propname, '@') + 1;
2126
2127         if (strchr(cp, '@')) {
2128 #ifdef sun
2129                 /*
2130                  * It's a SID name (eg "user@domain") that needs to be
2131                  * turned into S-1-domainID-RID.
2132                  */
2133                 directory_error_t e;
2134
2135                 if (zoned && getzoneid() == GLOBAL_ZONEID)
2136                         return (ENOENT);
2137                 if (isuser) {
2138                         e = directory_sid_from_user_name(NULL,
2139                             cp, &numericsid);
2140                 } else {
2141                         e = directory_sid_from_group_name(NULL,
2142                             cp, &numericsid);
2143                 }
2144                 if (e != NULL) {
2145                         directory_error_free(e);
2146                         return (ENOENT);
2147                 }
2148                 if (numericsid == NULL)
2149                         return (ENOENT);
2150                 cp = numericsid;
2151                 /* will be further decoded below */
2152 #else   /* !sun */
2153                 return (ENOENT);
2154 #endif  /* !sun */
2155         }
2156
2157         if (strncmp(cp, "S-1-", 4) == 0) {
2158                 /* It's a numeric SID (eg "S-1-234-567-89") */
2159                 (void) strlcpy(domain, cp, domainlen);
2160                 cp = strrchr(domain, '-');
2161                 *cp = '\0';
2162                 cp++;
2163
2164                 errno = 0;
2165                 *ridp = strtoull(cp, &end, 10);
2166                 if (numericsid) {
2167                         free(numericsid);
2168                         numericsid = NULL;
2169                 }
2170                 if (errno != 0 || *end != '\0')
2171                         return (EINVAL);
2172 #ifdef sun
2173         } else if (!isdigit(*cp)) {
2174 #else   /* sun */
2175         /*
2176          * In FreeBSD user and group names can begin with a digit so treat
2177          * as a uid/gid if string contains digits only
2178          */
2179         } else if (!string_is_digits(cp)) {
2180 #endif  /* sun */
2181                 /*
2182                  * It's a user/group name (eg "user") that needs to be
2183                  * turned into a uid/gid
2184                  */
2185                 if (zoned && getzoneid() == GLOBAL_ZONEID)
2186                         return (ENOENT);
2187                 if (isuser) {
2188                         struct passwd *pw;
2189                         pw = getpwnam(cp);
2190                         if (pw == NULL)
2191                                 return (ENOENT);
2192                         *ridp = pw->pw_uid;
2193                 } else {
2194                         struct group *gr;
2195                         gr = getgrnam(cp);
2196                         if (gr == NULL)
2197                                 return (ENOENT);
2198                         *ridp = gr->gr_gid;
2199                 }
2200         } else {
2201                 /* It's a user/group ID (eg "12345"). */
2202                 uid_t id = strtoul(cp, &end, 10);
2203                 idmap_rid_t rid;
2204                 char *mapdomain;
2205
2206                 if (*end != '\0')
2207                         return (EINVAL);
2208                 if (id > MAXUID) {
2209                         /* It's an ephemeral ID. */
2210                         if (idmap_id_to_numeric_domain_rid(id, isuser,
2211                             &mapdomain, &rid) != 0)
2212                                 return (ENOENT);
2213                         (void) strlcpy(domain, mapdomain, domainlen);
2214                         *ridp = rid;
2215                 } else {
2216                         *ridp = id;
2217                 }
2218         }
2219
2220         ASSERT3P(numericsid, ==, NULL);
2221         return (0);
2222 }
2223
2224 static int
2225 zfs_prop_get_userquota_common(zfs_handle_t *zhp, const char *propname,
2226     uint64_t *propvalue, zfs_userquota_prop_t *typep)
2227 {
2228         int err;
2229         zfs_cmd_t zc = { 0 };
2230
2231         (void) strncpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
2232
2233         err = userquota_propname_decode(propname,
2234             zfs_prop_get_int(zhp, ZFS_PROP_ZONED),
2235             typep, zc.zc_value, sizeof (zc.zc_value), &zc.zc_guid);
2236         zc.zc_objset_type = *typep;
2237         if (err)
2238                 return (err);
2239
2240         err = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_USERSPACE_ONE, &zc);
2241         if (err)
2242                 return (err);
2243
2244         *propvalue = zc.zc_cookie;
2245         return (0);
2246 }
2247
2248 int
2249 zfs_prop_get_userquota_int(zfs_handle_t *zhp, const char *propname,
2250     uint64_t *propvalue)
2251 {
2252         zfs_userquota_prop_t type;
2253
2254         return (zfs_prop_get_userquota_common(zhp, propname, propvalue,
2255             &type));
2256 }
2257
2258 int
2259 zfs_prop_get_userquota(zfs_handle_t *zhp, const char *propname,
2260     char *propbuf, int proplen, boolean_t literal)
2261 {
2262         int err;
2263         uint64_t propvalue;
2264         zfs_userquota_prop_t type;
2265
2266         err = zfs_prop_get_userquota_common(zhp, propname, &propvalue,
2267             &type);
2268
2269         if (err)
2270                 return (err);
2271
2272         if (literal) {
2273                 (void) snprintf(propbuf, proplen, "%llu", propvalue);
2274         } else if (propvalue == 0 &&
2275             (type == ZFS_PROP_USERQUOTA || type == ZFS_PROP_GROUPQUOTA)) {
2276                 (void) strlcpy(propbuf, "none", proplen);
2277         } else {
2278                 zfs_nicenum(propvalue, propbuf, proplen);
2279         }
2280         return (0);
2281 }
2282
2283 /*
2284  * Returns the name of the given zfs handle.
2285  */
2286 const char *
2287 zfs_get_name(const zfs_handle_t *zhp)
2288 {
2289         return (zhp->zfs_name);
2290 }
2291
2292 /*
2293  * Returns the type of the given zfs handle.
2294  */
2295 zfs_type_t
2296 zfs_get_type(const zfs_handle_t *zhp)
2297 {
2298         return (zhp->zfs_type);
2299 }
2300
2301 static int
2302 zfs_do_list_ioctl(zfs_handle_t *zhp, unsigned long arg, zfs_cmd_t *zc)
2303 {
2304         int rc;
2305         uint64_t        orig_cookie;
2306
2307         orig_cookie = zc->zc_cookie;
2308 top:
2309         (void) strlcpy(zc->zc_name, zhp->zfs_name, sizeof (zc->zc_name));
2310         rc = ioctl(zhp->zfs_hdl->libzfs_fd, arg, zc);
2311
2312         /*
2313          * FreeBSD compatibility with pre-v15 kernel module.
2314          * Ignore private dataset names.
2315          */
2316         if (strchr(zc->zc_name, '$') != NULL)
2317                 rc = 0;
2318
2319         if (rc == -1) {
2320                 switch (errno) {
2321                 case ENOMEM:
2322                         /* expand nvlist memory and try again */
2323                         if (zcmd_expand_dst_nvlist(zhp->zfs_hdl, zc) != 0) {
2324                                 zcmd_free_nvlists(zc);
2325                                 return (-1);
2326                         }
2327                         zc->zc_cookie = orig_cookie;
2328                         goto top;
2329                 /*
2330                  * An errno value of ESRCH indicates normal completion.
2331                  * If ENOENT is returned, then the underlying dataset
2332                  * has been removed since we obtained the handle.
2333                  */
2334                 case ESRCH:
2335                 case ENOENT:
2336                         rc = 1;
2337                         break;
2338                 default:
2339                         rc = zfs_standard_error(zhp->zfs_hdl, errno,
2340                             dgettext(TEXT_DOMAIN,
2341                             "cannot iterate filesystems"));
2342                         break;
2343                 }
2344         }
2345         return (rc);
2346 }
2347
2348 /*
2349  * Iterate over all child filesystems
2350  */
2351 int
2352 zfs_iter_filesystems(zfs_handle_t *zhp, zfs_iter_f func, void *data)
2353 {
2354         zfs_cmd_t zc = { 0 };
2355         zfs_handle_t *nzhp;
2356         int ret;
2357
2358         if (zhp->zfs_type != ZFS_TYPE_FILESYSTEM)
2359                 return (0);
2360
2361         if (zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
2362                 return (-1);
2363
2364         while ((ret = zfs_do_list_ioctl(zhp, ZFS_IOC_DATASET_LIST_NEXT,
2365             &zc)) == 0) {
2366
2367                 /*
2368                  * FreeBSD compatibility with pre-v15 kernel module.
2369                  * Ignore private dataset names.
2370                  */
2371                 if (strchr(zc.zc_name, '$') != NULL)
2372                         continue;
2373
2374                 /*
2375                  * Silently ignore errors, as the only plausible explanation is
2376                  * that the pool has since been removed.
2377                  */
2378                 if ((nzhp = make_dataset_handle_zc(zhp->zfs_hdl,
2379                     &zc)) == NULL) {
2380                         continue;
2381                 }
2382
2383                 if ((ret = func(nzhp, data)) != 0) {
2384                         zcmd_free_nvlists(&zc);
2385                         return (ret);
2386                 }
2387         }
2388         zcmd_free_nvlists(&zc);
2389         return ((ret < 0) ? ret : 0);
2390 }
2391
2392 /*
2393  * Iterate over all snapshots
2394  */
2395 int
2396 zfs_iter_snapshots(zfs_handle_t *zhp, zfs_iter_f func, void *data)
2397 {
2398         zfs_cmd_t zc = { 0 };
2399         zfs_handle_t *nzhp;
2400         int ret;
2401
2402         if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
2403                 return (0);
2404
2405         if (zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
2406                 return (-1);
2407         while ((ret = zfs_do_list_ioctl(zhp, ZFS_IOC_SNAPSHOT_LIST_NEXT,
2408             &zc)) == 0) {
2409
2410                 /*
2411                  * FreeBSD compatibility with pre-v15 kernel module.
2412                  * Ignore private dataset names.
2413                  */
2414                 if (strchr(zc.zc_name, '$') != NULL)
2415                         continue;
2416
2417                 if ((nzhp = make_dataset_handle_zc(zhp->zfs_hdl,
2418                     &zc)) == NULL) {
2419                         continue;
2420                 }
2421
2422                 if ((ret = func(nzhp, data)) != 0) {
2423                         zcmd_free_nvlists(&zc);
2424                         return (ret);
2425                 }
2426         }
2427         zcmd_free_nvlists(&zc);
2428         return ((ret < 0) ? ret : 0);
2429 }
2430
2431 /*
2432  * Iterate over all children, snapshots and filesystems
2433  */
2434 int
2435 zfs_iter_children(zfs_handle_t *zhp, zfs_iter_f func, void *data)
2436 {
2437         int ret;
2438
2439         if ((ret = zfs_iter_filesystems(zhp, func, data)) != 0)
2440                 return (ret);
2441
2442         return (zfs_iter_snapshots(zhp, func, data));
2443 }
2444
2445 /*
2446  * Given a complete name, return just the portion that refers to the parent.
2447  * Can return NULL if this is a pool.
2448  */
2449 static int
2450 parent_name(const char *path, char *buf, size_t buflen)
2451 {
2452         char *loc;
2453
2454         if ((loc = strrchr(path, '/')) == NULL)
2455                 return (-1);
2456
2457         (void) strncpy(buf, path, MIN(buflen, loc - path));
2458         buf[loc - path] = '\0';
2459
2460         return (0);
2461 }
2462
2463 /*
2464  * If accept_ancestor is false, then check to make sure that the given path has
2465  * a parent, and that it exists.  If accept_ancestor is true, then find the
2466  * closest existing ancestor for the given path.  In prefixlen return the
2467  * length of already existing prefix of the given path.  We also fetch the
2468  * 'zoned' property, which is used to validate property settings when creating
2469  * new datasets.
2470  */
2471 static int
2472 check_parents(libzfs_handle_t *hdl, const char *path, uint64_t *zoned,
2473     boolean_t accept_ancestor, int *prefixlen)
2474 {
2475         zfs_cmd_t zc = { 0 };
2476         char parent[ZFS_MAXNAMELEN];
2477         char *slash;
2478         zfs_handle_t *zhp;
2479         char errbuf[1024];
2480
2481         (void) snprintf(errbuf, sizeof (errbuf),
2482             dgettext(TEXT_DOMAIN, "cannot create '%s'"), path);
2483
2484         /* get parent, and check to see if this is just a pool */
2485         if (parent_name(path, parent, sizeof (parent)) != 0) {
2486                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2487                     "missing dataset name"));
2488                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2489         }
2490
2491         /* check to see if the pool exists */
2492         if ((slash = strchr(parent, '/')) == NULL)
2493                 slash = parent + strlen(parent);
2494         (void) strncpy(zc.zc_name, parent, slash - parent);
2495         zc.zc_name[slash - parent] = '\0';
2496         if (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0 &&
2497             errno == ENOENT) {
2498                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2499                     "no such pool '%s'"), zc.zc_name);
2500                 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2501         }
2502
2503         /* check to see if the parent dataset exists */
2504         while ((zhp = make_dataset_handle(hdl, parent)) == NULL) {
2505                 if (errno == ENOENT && accept_ancestor) {
2506                         /*
2507                          * Go deeper to find an ancestor, give up on top level.
2508                          */
2509                         if (parent_name(parent, parent, sizeof (parent)) != 0) {
2510                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2511                                     "no such pool '%s'"), zc.zc_name);
2512                                 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2513                         }
2514                 } else if (errno == ENOENT) {
2515                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2516                             "parent does not exist"));
2517                         return (zfs_error(hdl, EZFS_NOENT, errbuf));
2518                 } else
2519                         return (zfs_standard_error(hdl, errno, errbuf));
2520         }
2521
2522         *zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
2523         /* we are in a non-global zone, but parent is in the global zone */
2524         if (getzoneid() != GLOBAL_ZONEID && !(*zoned)) {
2525                 (void) zfs_standard_error(hdl, EPERM, errbuf);
2526                 zfs_close(zhp);
2527                 return (-1);
2528         }
2529
2530         /* make sure parent is a filesystem */
2531         if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
2532                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2533                     "parent is not a filesystem"));
2534                 (void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
2535                 zfs_close(zhp);
2536                 return (-1);
2537         }
2538
2539         zfs_close(zhp);
2540         if (prefixlen != NULL)
2541                 *prefixlen = strlen(parent);
2542         return (0);
2543 }
2544
2545 /*
2546  * Finds whether the dataset of the given type(s) exists.
2547  */
2548 boolean_t
2549 zfs_dataset_exists(libzfs_handle_t *hdl, const char *path, zfs_type_t types)
2550 {
2551         zfs_handle_t *zhp;
2552
2553         if (!zfs_validate_name(hdl, path, types, B_FALSE))
2554                 return (B_FALSE);
2555
2556         /*
2557          * Try to get stats for the dataset, which will tell us if it exists.
2558          */
2559         if ((zhp = make_dataset_handle(hdl, path)) != NULL) {
2560                 int ds_type = zhp->zfs_type;
2561
2562                 zfs_close(zhp);
2563                 if (types & ds_type)
2564                         return (B_TRUE);
2565         }
2566         return (B_FALSE);
2567 }
2568
2569 /*
2570  * Given a path to 'target', create all the ancestors between
2571  * the prefixlen portion of the path, and the target itself.
2572  * Fail if the initial prefixlen-ancestor does not already exist.
2573  */
2574 int
2575 create_parents(libzfs_handle_t *hdl, char *target, int prefixlen)
2576 {
2577         zfs_handle_t *h;
2578         char *cp;
2579         const char *opname;
2580
2581         /* make sure prefix exists */
2582         cp = target + prefixlen;
2583         if (*cp != '/') {
2584                 assert(strchr(cp, '/') == NULL);
2585                 h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
2586         } else {
2587                 *cp = '\0';
2588                 h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
2589                 *cp = '/';
2590         }
2591         if (h == NULL)
2592                 return (-1);
2593         zfs_close(h);
2594
2595         /*
2596          * Attempt to create, mount, and share any ancestor filesystems,
2597          * up to the prefixlen-long one.
2598          */
2599         for (cp = target + prefixlen + 1;
2600             cp = strchr(cp, '/'); *cp = '/', cp++) {
2601                 char *logstr;
2602
2603                 *cp = '\0';
2604
2605                 h = make_dataset_handle(hdl, target);
2606                 if (h) {
2607                         /* it already exists, nothing to do here */
2608                         zfs_close(h);
2609                         continue;
2610                 }
2611
2612                 logstr = hdl->libzfs_log_str;
2613                 hdl->libzfs_log_str = NULL;
2614                 if (zfs_create(hdl, target, ZFS_TYPE_FILESYSTEM,
2615                     NULL) != 0) {
2616                         hdl->libzfs_log_str = logstr;
2617                         opname = dgettext(TEXT_DOMAIN, "create");
2618                         goto ancestorerr;
2619                 }
2620
2621                 hdl->libzfs_log_str = logstr;
2622                 h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
2623                 if (h == NULL) {
2624                         opname = dgettext(TEXT_DOMAIN, "open");
2625                         goto ancestorerr;
2626                 }
2627
2628                 if (zfs_mount(h, NULL, 0) != 0) {
2629                         opname = dgettext(TEXT_DOMAIN, "mount");
2630                         goto ancestorerr;
2631                 }
2632
2633                 if (zfs_share(h) != 0) {
2634                         opname = dgettext(TEXT_DOMAIN, "share");
2635                         goto ancestorerr;
2636                 }
2637
2638                 zfs_close(h);
2639         }
2640
2641         return (0);
2642
2643 ancestorerr:
2644         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2645             "failed to %s ancestor '%s'"), opname, target);
2646         return (-1);
2647 }
2648
2649 /*
2650  * Creates non-existing ancestors of the given path.
2651  */
2652 int
2653 zfs_create_ancestors(libzfs_handle_t *hdl, const char *path)
2654 {
2655         int prefix;
2656         uint64_t zoned;
2657         char *path_copy;
2658         int rc;
2659
2660         if (check_parents(hdl, path, &zoned, B_TRUE, &prefix) != 0)
2661                 return (-1);
2662
2663         if ((path_copy = strdup(path)) != NULL) {
2664                 rc = create_parents(hdl, path_copy, prefix);
2665                 free(path_copy);
2666         }
2667         if (path_copy == NULL || rc != 0)
2668                 return (-1);
2669
2670         return (0);
2671 }
2672
2673 /*
2674  * Create a new filesystem or volume.
2675  */
2676 int
2677 zfs_create(libzfs_handle_t *hdl, const char *path, zfs_type_t type,
2678     nvlist_t *props)
2679 {
2680         zfs_cmd_t zc = { 0 };
2681         int ret;
2682         uint64_t size = 0;
2683         uint64_t blocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
2684         char errbuf[1024];
2685         uint64_t zoned;
2686
2687         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2688             "cannot create '%s'"), path);
2689
2690         /* validate the path, taking care to note the extended error message */
2691         if (!zfs_validate_name(hdl, path, type, B_TRUE))
2692                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2693
2694         /* validate parents exist */
2695         if (check_parents(hdl, path, &zoned, B_FALSE, NULL) != 0)
2696                 return (-1);
2697
2698         /*
2699          * The failure modes when creating a dataset of a different type over
2700          * one that already exists is a little strange.  In particular, if you
2701          * try to create a dataset on top of an existing dataset, the ioctl()
2702          * will return ENOENT, not EEXIST.  To prevent this from happening, we
2703          * first try to see if the dataset exists.
2704          */
2705         (void) strlcpy(zc.zc_name, path, sizeof (zc.zc_name));
2706         if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
2707                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2708                     "dataset already exists"));
2709                 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
2710         }
2711
2712         if (type == ZFS_TYPE_VOLUME)
2713                 zc.zc_objset_type = DMU_OST_ZVOL;
2714         else
2715                 zc.zc_objset_type = DMU_OST_ZFS;
2716
2717         if (props && (props = zfs_valid_proplist(hdl, type, props,
2718             zoned, NULL, errbuf)) == 0)
2719                 return (-1);
2720
2721         if (type == ZFS_TYPE_VOLUME) {
2722                 /*
2723                  * If we are creating a volume, the size and block size must
2724                  * satisfy a few restraints.  First, the blocksize must be a
2725                  * valid block size between SPA_{MIN,MAX}BLOCKSIZE.  Second, the
2726                  * volsize must be a multiple of the block size, and cannot be
2727                  * zero.
2728                  */
2729                 if (props == NULL || nvlist_lookup_uint64(props,
2730                     zfs_prop_to_name(ZFS_PROP_VOLSIZE), &size) != 0) {
2731                         nvlist_free(props);
2732                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2733                             "missing volume size"));
2734                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
2735                 }
2736
2737                 if ((ret = nvlist_lookup_uint64(props,
2738                     zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
2739                     &blocksize)) != 0) {
2740                         if (ret == ENOENT) {
2741                                 blocksize = zfs_prop_default_numeric(
2742                                     ZFS_PROP_VOLBLOCKSIZE);
2743                         } else {
2744                                 nvlist_free(props);
2745                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2746                                     "missing volume block size"));
2747                                 return (zfs_error(hdl, EZFS_BADPROP, errbuf));
2748                         }
2749                 }
2750
2751                 if (size == 0) {
2752                         nvlist_free(props);
2753                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2754                             "volume size cannot be zero"));
2755                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
2756                 }
2757
2758                 if (size % blocksize != 0) {
2759                         nvlist_free(props);
2760                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2761                             "volume size must be a multiple of volume block "
2762                             "size"));
2763                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
2764                 }
2765         }
2766
2767         if (props && zcmd_write_src_nvlist(hdl, &zc, props) != 0)
2768                 return (-1);
2769         nvlist_free(props);
2770
2771         /* create the dataset */
2772         ret = zfs_ioctl(hdl, ZFS_IOC_CREATE, &zc);
2773
2774         if (ret == 0 && type == ZFS_TYPE_VOLUME) {
2775                 ret = zvol_create_link(hdl, path);
2776                 if (ret) {
2777                         (void) zfs_standard_error(hdl, errno,
2778                             dgettext(TEXT_DOMAIN,
2779                             "Volume successfully created, but device links "
2780                             "were not created"));
2781                         zcmd_free_nvlists(&zc);
2782                         return (-1);
2783                 }
2784         }
2785
2786         zcmd_free_nvlists(&zc);
2787
2788         /* check for failure */
2789         if (ret != 0) {
2790                 char parent[ZFS_MAXNAMELEN];
2791                 (void) parent_name(path, parent, sizeof (parent));
2792
2793                 switch (errno) {
2794                 case ENOENT:
2795                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2796                             "no such parent '%s'"), parent);
2797                         return (zfs_error(hdl, EZFS_NOENT, errbuf));
2798
2799                 case EINVAL:
2800                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2801                             "parent '%s' is not a filesystem"), parent);
2802                         return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
2803
2804                 case EDOM:
2805                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2806                             "volume block size must be power of 2 from "
2807                             "%u to %uk"),
2808                             (uint_t)SPA_MINBLOCKSIZE,
2809                             (uint_t)SPA_MAXBLOCKSIZE >> 10);
2810
2811                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
2812
2813                 case ENOTSUP:
2814                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2815                             "pool must be upgraded to set this "
2816                             "property or value"));
2817                         return (zfs_error(hdl, EZFS_BADVERSION, errbuf));
2818 #ifdef _ILP32
2819                 case EOVERFLOW:
2820                         /*
2821                          * This platform can't address a volume this big.
2822                          */
2823                         if (type == ZFS_TYPE_VOLUME)
2824                                 return (zfs_error(hdl, EZFS_VOLTOOBIG,
2825                                     errbuf));
2826 #endif
2827                         /* FALLTHROUGH */
2828                 default:
2829                         return (zfs_standard_error(hdl, errno, errbuf));
2830                 }
2831         }
2832
2833         return (0);
2834 }
2835
2836 /*
2837  * Destroys the given dataset.  The caller must make sure that the filesystem
2838  * isn't mounted, and that there are no active dependents.
2839  */
2840 int
2841 zfs_destroy(zfs_handle_t *zhp)
2842 {
2843         zfs_cmd_t zc = { 0 };
2844
2845         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
2846
2847         if (ZFS_IS_VOLUME(zhp)) {
2848                 /*
2849                  * If user doesn't have permissions to unshare volume, then
2850                  * abort the request.  This would only happen for a
2851                  * non-privileged user.
2852                  */
2853                 if (zfs_unshare_iscsi(zhp) != 0) {
2854                         return (-1);
2855                 }
2856
2857                 if (zvol_remove_link(zhp->zfs_hdl, zhp->zfs_name) != 0)
2858                         return (-1);
2859
2860                 zc.zc_objset_type = DMU_OST_ZVOL;
2861         } else {
2862                 zc.zc_objset_type = DMU_OST_ZFS;
2863         }
2864
2865         if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_DESTROY, &zc) != 0) {
2866                 return (zfs_standard_error_fmt(zhp->zfs_hdl, errno,
2867                     dgettext(TEXT_DOMAIN, "cannot destroy '%s'"),
2868                     zhp->zfs_name));
2869         }
2870
2871         remove_mountpoint(zhp);
2872
2873         return (0);
2874 }
2875
2876 struct destroydata {
2877         char *snapname;
2878         boolean_t gotone;
2879         boolean_t closezhp;
2880 };
2881
2882 static int
2883 zfs_remove_link_cb(zfs_handle_t *zhp, void *arg)
2884 {
2885         struct destroydata *dd = arg;
2886         zfs_handle_t *szhp;
2887         char name[ZFS_MAXNAMELEN];
2888         boolean_t closezhp = dd->closezhp;
2889         int rv;
2890
2891         (void) strlcpy(name, zhp->zfs_name, sizeof (name));
2892         (void) strlcat(name, "@", sizeof (name));
2893         (void) strlcat(name, dd->snapname, sizeof (name));
2894
2895         szhp = make_dataset_handle(zhp->zfs_hdl, name);
2896         if (szhp) {
2897                 dd->gotone = B_TRUE;
2898                 zfs_close(szhp);
2899         }
2900
2901         if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
2902                 (void) zvol_remove_link(zhp->zfs_hdl, name);
2903                 /*
2904                  * NB: this is simply a best-effort.  We don't want to
2905                  * return an error, because then we wouldn't visit all
2906                  * the volumes.
2907                  */
2908         }
2909
2910         dd->closezhp = B_TRUE;
2911         rv = zfs_iter_filesystems(zhp, zfs_remove_link_cb, arg);
2912         if (closezhp)
2913                 zfs_close(zhp);
2914         return (rv);
2915 }
2916
2917 /*
2918  * Destroys all snapshots with the given name in zhp & descendants.
2919  */
2920 int
2921 zfs_destroy_snaps(zfs_handle_t *zhp, char *snapname)
2922 {
2923         zfs_cmd_t zc = { 0 };
2924         int ret;
2925         struct destroydata dd = { 0 };
2926
2927         dd.snapname = snapname;
2928         (void) zfs_remove_link_cb(zhp, &dd);
2929
2930         if (!dd.gotone) {
2931                 return (zfs_standard_error_fmt(zhp->zfs_hdl, ENOENT,
2932                     dgettext(TEXT_DOMAIN, "cannot destroy '%s@%s'"),
2933                     zhp->zfs_name, snapname));
2934         }
2935
2936         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
2937         (void) strlcpy(zc.zc_value, snapname, sizeof (zc.zc_value));
2938
2939         ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_DESTROY_SNAPS, &zc);
2940         if (ret != 0) {
2941                 char errbuf[1024];
2942
2943                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2944                     "cannot destroy '%s@%s'"), zc.zc_name, snapname);
2945
2946                 switch (errno) {
2947                 case EEXIST:
2948                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
2949                             "snapshot is cloned"));
2950                         return (zfs_error(zhp->zfs_hdl, EZFS_EXISTS, errbuf));
2951
2952                 default:
2953                         return (zfs_standard_error(zhp->zfs_hdl, errno,
2954                             errbuf));
2955                 }
2956         }
2957
2958         return (0);
2959 }
2960
2961 /*
2962  * Clones the given dataset.  The target must be of the same type as the source.
2963  */
2964 int
2965 zfs_clone(zfs_handle_t *zhp, const char *target, nvlist_t *props)
2966 {
2967         zfs_cmd_t zc = { 0 };
2968         char parent[ZFS_MAXNAMELEN];
2969         int ret;
2970         char errbuf[1024];
2971         libzfs_handle_t *hdl = zhp->zfs_hdl;
2972         zfs_type_t type;
2973         uint64_t zoned;
2974
2975         assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
2976
2977         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2978             "cannot create '%s'"), target);
2979
2980         /* validate the target name */
2981         if (!zfs_validate_name(hdl, target, ZFS_TYPE_FILESYSTEM, B_TRUE))
2982                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2983
2984         /* validate parents exist */
2985         if (check_parents(hdl, target, &zoned, B_FALSE, NULL) != 0)
2986                 return (-1);
2987
2988         (void) parent_name(target, parent, sizeof (parent));
2989
2990         /* do the clone */
2991         if (ZFS_IS_VOLUME(zhp)) {
2992                 zc.zc_objset_type = DMU_OST_ZVOL;
2993                 type = ZFS_TYPE_VOLUME;
2994         } else {
2995                 zc.zc_objset_type = DMU_OST_ZFS;
2996                 type = ZFS_TYPE_FILESYSTEM;
2997         }
2998
2999         if (props) {
3000                 if ((props = zfs_valid_proplist(hdl, type, props, zoned,
3001                     zhp, errbuf)) == NULL)
3002                         return (-1);
3003
3004                 if (zcmd_write_src_nvlist(hdl, &zc, props) != 0) {
3005                         nvlist_free(props);
3006                         return (-1);
3007                 }
3008
3009                 nvlist_free(props);
3010         }
3011
3012         (void) strlcpy(zc.zc_name, target, sizeof (zc.zc_name));
3013         (void) strlcpy(zc.zc_value, zhp->zfs_name, sizeof (zc.zc_value));
3014         ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_CREATE, &zc);
3015
3016         zcmd_free_nvlists(&zc);
3017
3018         if (ret != 0) {
3019                 switch (errno) {
3020
3021                 case ENOENT:
3022                         /*
3023                          * The parent doesn't exist.  We should have caught this
3024                          * above, but there may a race condition that has since
3025                          * destroyed the parent.
3026                          *
3027                          * At this point, we don't know whether it's the source
3028                          * that doesn't exist anymore, or whether the target
3029                          * dataset doesn't exist.
3030                          */
3031                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
3032                             "no such parent '%s'"), parent);
3033                         return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
3034
3035                 case EXDEV:
3036                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
3037                             "source and target pools differ"));
3038                         return (zfs_error(zhp->zfs_hdl, EZFS_CROSSTARGET,
3039                             errbuf));
3040
3041                 default:
3042                         return (zfs_standard_error(zhp->zfs_hdl, errno,
3043                             errbuf));
3044                 }
3045         } else if (ZFS_IS_VOLUME(zhp)) {
3046                 ret = zvol_create_link(zhp->zfs_hdl, target);
3047         }
3048
3049         return (ret);
3050 }
3051
3052 typedef struct promote_data {
3053         char cb_mountpoint[MAXPATHLEN];
3054         const char *cb_target;
3055         const char *cb_errbuf;
3056         uint64_t cb_pivot_txg;
3057 } promote_data_t;
3058
3059 static int
3060 promote_snap_cb(zfs_handle_t *zhp, void *data)
3061 {
3062         promote_data_t *pd = data;
3063         zfs_handle_t *szhp;
3064         char snapname[MAXPATHLEN];
3065         int rv = 0;
3066
3067         /* We don't care about snapshots after the pivot point */
3068         if (zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) > pd->cb_pivot_txg) {
3069                 zfs_close(zhp);
3070                 return (0);
3071         }
3072
3073         /* Remove the device link if it's a zvol. */
3074         if (ZFS_IS_VOLUME(zhp))
3075                 (void) zvol_remove_link(zhp->zfs_hdl, zhp->zfs_name);
3076
3077         /* Check for conflicting names */
3078         (void) strlcpy(snapname, pd->cb_target, sizeof (snapname));
3079         (void) strlcat(snapname, strchr(zhp->zfs_name, '@'), sizeof (snapname));
3080         szhp = make_dataset_handle(zhp->zfs_hdl, snapname);
3081         if (szhp != NULL) {
3082                 zfs_close(szhp);
3083                 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
3084                     "snapshot name '%s' from origin \n"
3085                     "conflicts with '%s' from target"),
3086                     zhp->zfs_name, snapname);
3087                 rv = zfs_error(zhp->zfs_hdl, EZFS_EXISTS, pd->cb_errbuf);
3088         }
3089         zfs_close(zhp);
3090         return (rv);
3091 }
3092
3093 static int
3094 promote_snap_done_cb(zfs_handle_t *zhp, void *data)
3095 {
3096         promote_data_t *pd = data;
3097
3098         /* We don't care about snapshots after the pivot point */
3099         if (zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) <= pd->cb_pivot_txg) {
3100                 /* Create the device link if it's a zvol. */
3101                 if (ZFS_IS_VOLUME(zhp))
3102                         (void) zvol_create_link(zhp->zfs_hdl, zhp->zfs_name);
3103         }
3104
3105         zfs_close(zhp);
3106         return (0);
3107 }
3108
3109 /*
3110  * Promotes the given clone fs to be the clone parent.
3111  */
3112 int
3113 zfs_promote(zfs_handle_t *zhp)
3114 {
3115         libzfs_handle_t *hdl = zhp->zfs_hdl;
3116         zfs_cmd_t zc = { 0 };
3117         char parent[MAXPATHLEN];
3118         char *cp;
3119         int ret;
3120         zfs_handle_t *pzhp;
3121         promote_data_t pd;
3122         char errbuf[1024];
3123
3124         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3125             "cannot promote '%s'"), zhp->zfs_name);
3126
3127         if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
3128                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3129                     "snapshots can not be promoted"));
3130                 return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3131         }
3132
3133         (void) strlcpy(parent, zhp->zfs_dmustats.dds_origin, sizeof (parent));
3134         if (parent[0] == '\0') {
3135                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3136                     "not a cloned filesystem"));
3137                 return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3138         }
3139         cp = strchr(parent, '@');
3140         *cp = '\0';
3141
3142         /* Walk the snapshots we will be moving */
3143         pzhp = zfs_open(hdl, zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT);
3144         if (pzhp == NULL)
3145                 return (-1);
3146         pd.cb_pivot_txg = zfs_prop_get_int(pzhp, ZFS_PROP_CREATETXG);
3147         zfs_close(pzhp);
3148         pd.cb_target = zhp->zfs_name;
3149         pd.cb_errbuf = errbuf;
3150         pzhp = zfs_open(hdl, parent, ZFS_TYPE_DATASET);
3151         if (pzhp == NULL)
3152                 return (-1);
3153         (void) zfs_prop_get(pzhp, ZFS_PROP_MOUNTPOINT, pd.cb_mountpoint,
3154             sizeof (pd.cb_mountpoint), NULL, NULL, 0, FALSE);
3155         ret = zfs_iter_snapshots(pzhp, promote_snap_cb, &pd);
3156         if (ret != 0) {
3157                 zfs_close(pzhp);
3158                 return (-1);
3159         }
3160
3161         /* issue the ioctl */
3162         (void) strlcpy(zc.zc_value, zhp->zfs_dmustats.dds_origin,
3163             sizeof (zc.zc_value));
3164         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3165         ret = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
3166
3167         if (ret != 0) {
3168                 int save_errno = errno;
3169
3170                 (void) zfs_iter_snapshots(pzhp, promote_snap_done_cb, &pd);
3171                 zfs_close(pzhp);
3172
3173                 switch (save_errno) {
3174                 case EEXIST:
3175                         /*
3176                          * There is a conflicting snapshot name.  We
3177                          * should have caught this above, but they could
3178                          * have renamed something in the mean time.
3179                          */
3180                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3181                             "conflicting snapshot name from parent '%s'"),
3182                             parent);
3183                         return (zfs_error(hdl, EZFS_EXISTS, errbuf));
3184
3185                 default:
3186                         return (zfs_standard_error(hdl, save_errno, errbuf));
3187                 }
3188         } else {
3189                 (void) zfs_iter_snapshots(zhp, promote_snap_done_cb, &pd);
3190         }
3191
3192         zfs_close(pzhp);
3193         return (ret);
3194 }
3195
3196 struct createdata {
3197         const char *cd_snapname;
3198         int cd_ifexists;
3199 };
3200
3201 static int
3202 zfs_create_link_cb(zfs_handle_t *zhp, void *arg)
3203 {
3204         struct createdata *cd = arg;
3205         int ret;
3206
3207         if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
3208                 char name[MAXPATHLEN];
3209
3210                 (void) strlcpy(name, zhp->zfs_name, sizeof (name));
3211                 (void) strlcat(name, "@", sizeof (name));
3212                 (void) strlcat(name, cd->cd_snapname, sizeof (name));
3213                 (void) zvol_create_link_common(zhp->zfs_hdl, name,
3214                     cd->cd_ifexists);
3215                 /*
3216                  * NB: this is simply a best-effort.  We don't want to
3217                  * return an error, because then we wouldn't visit all
3218                  * the volumes.
3219                  */
3220         }
3221
3222         ret = zfs_iter_filesystems(zhp, zfs_create_link_cb, cd);
3223
3224         zfs_close(zhp);
3225
3226         return (ret);
3227 }
3228
3229 /*
3230  * Takes a snapshot of the given dataset.
3231  */
3232 int
3233 zfs_snapshot(libzfs_handle_t *hdl, const char *path, boolean_t recursive,
3234     nvlist_t *props)
3235 {
3236         const char *delim;
3237         char parent[ZFS_MAXNAMELEN];
3238         zfs_handle_t *zhp;
3239         zfs_cmd_t zc = { 0 };
3240         int ret;
3241         char errbuf[1024];
3242
3243         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3244             "cannot snapshot '%s'"), path);
3245
3246         /* validate the target name */
3247         if (!zfs_validate_name(hdl, path, ZFS_TYPE_SNAPSHOT, B_TRUE))
3248                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3249
3250         if (props) {
3251                 if ((props = zfs_valid_proplist(hdl, ZFS_TYPE_SNAPSHOT,
3252                     props, B_FALSE, NULL, errbuf)) == NULL)
3253                         return (-1);
3254
3255                 if (zcmd_write_src_nvlist(hdl, &zc, props) != 0) {
3256                         nvlist_free(props);
3257                         return (-1);
3258                 }
3259
3260                 nvlist_free(props);
3261         }
3262
3263         /* make sure the parent exists and is of the appropriate type */
3264         delim = strchr(path, '@');
3265         (void) strncpy(parent, path, delim - path);
3266         parent[delim - path] = '\0';
3267
3268         if ((zhp = zfs_open(hdl, parent, ZFS_TYPE_FILESYSTEM |
3269             ZFS_TYPE_VOLUME)) == NULL) {
3270                 zcmd_free_nvlists(&zc);
3271                 return (-1);
3272         }
3273
3274         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3275         (void) strlcpy(zc.zc_value, delim+1, sizeof (zc.zc_value));
3276         if (ZFS_IS_VOLUME(zhp))
3277                 zc.zc_objset_type = DMU_OST_ZVOL;
3278         else
3279                 zc.zc_objset_type = DMU_OST_ZFS;
3280         zc.zc_cookie = recursive;
3281         ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SNAPSHOT, &zc);
3282
3283         zcmd_free_nvlists(&zc);
3284
3285         /*
3286          * if it was recursive, the one that actually failed will be in
3287          * zc.zc_name.
3288          */
3289         if (ret != 0)
3290                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3291                     "cannot create snapshot '%s@%s'"), zc.zc_name, zc.zc_value);
3292
3293         if (ret == 0 && recursive) {
3294                 struct createdata cd;
3295
3296                 cd.cd_snapname = delim + 1;
3297                 cd.cd_ifexists = B_FALSE;
3298                 (void) zfs_iter_filesystems(zhp, zfs_create_link_cb, &cd);
3299         }
3300         if (ret == 0 && zhp->zfs_type == ZFS_TYPE_VOLUME) {
3301                 ret = zvol_create_link(zhp->zfs_hdl, path);
3302                 if (ret != 0) {
3303                         (void) zfs_standard_error(hdl, errno,
3304                             dgettext(TEXT_DOMAIN,
3305                             "Volume successfully snapshotted, but device links "
3306                             "were not created"));
3307                         zfs_close(zhp);
3308                         return (-1);
3309                 }
3310         }
3311
3312         if (ret != 0)
3313                 (void) zfs_standard_error(hdl, errno, errbuf);
3314
3315         zfs_close(zhp);
3316
3317         return (ret);
3318 }
3319
3320 /*
3321  * Destroy any more recent snapshots.  We invoke this callback on any dependents
3322  * of the snapshot first.  If the 'cb_dependent' member is non-zero, then this
3323  * is a dependent and we should just destroy it without checking the transaction
3324  * group.
3325  */
3326 typedef struct rollback_data {
3327         const char      *cb_target;             /* the snapshot */
3328         uint64_t        cb_create;              /* creation time reference */
3329         boolean_t       cb_error;
3330         boolean_t       cb_dependent;
3331         boolean_t       cb_force;
3332 } rollback_data_t;
3333
3334 static int
3335 rollback_destroy(zfs_handle_t *zhp, void *data)
3336 {
3337         rollback_data_t *cbp = data;
3338
3339         if (!cbp->cb_dependent) {
3340                 if (strcmp(zhp->zfs_name, cbp->cb_target) != 0 &&
3341                     zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
3342                     zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) >
3343                     cbp->cb_create) {
3344                         char *logstr;
3345
3346                         cbp->cb_dependent = B_TRUE;
3347                         cbp->cb_error |= zfs_iter_dependents(zhp, B_FALSE,
3348                             rollback_destroy, cbp);
3349                         cbp->cb_dependent = B_FALSE;
3350
3351                         logstr = zhp->zfs_hdl->libzfs_log_str;
3352                         zhp->zfs_hdl->libzfs_log_str = NULL;
3353                         cbp->cb_error |= zfs_destroy(zhp);
3354                         zhp->zfs_hdl->libzfs_log_str = logstr;
3355                 }
3356         } else {
3357                 /* We must destroy this clone; first unmount it */
3358                 prop_changelist_t *clp;
3359
3360                 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
3361                     cbp->cb_force ? MS_FORCE: 0);
3362                 if (clp == NULL || changelist_prefix(clp) != 0) {
3363                         cbp->cb_error = B_TRUE;
3364                         zfs_close(zhp);
3365                         return (0);
3366                 }
3367                 if (zfs_destroy(zhp) != 0)
3368                         cbp->cb_error = B_TRUE;
3369                 else
3370                         changelist_remove(clp, zhp->zfs_name);
3371                 (void) changelist_postfix(clp);
3372                 changelist_free(clp);
3373         }
3374
3375         zfs_close(zhp);
3376         return (0);
3377 }
3378
3379 /*
3380  * Given a dataset, rollback to a specific snapshot, discarding any
3381  * data changes since then and making it the active dataset.
3382  *
3383  * Any snapshots more recent than the target are destroyed, along with
3384  * their dependents.
3385  */
3386 int
3387 zfs_rollback(zfs_handle_t *zhp, zfs_handle_t *snap, boolean_t force)
3388 {
3389         rollback_data_t cb = { 0 };
3390         int err;
3391         zfs_cmd_t zc = { 0 };
3392         boolean_t restore_resv = 0;
3393         uint64_t old_volsize, new_volsize;
3394         zfs_prop_t resv_prop;
3395
3396         assert(zhp->zfs_type == ZFS_TYPE_FILESYSTEM ||
3397             zhp->zfs_type == ZFS_TYPE_VOLUME);
3398
3399         /*
3400          * Destroy all recent snapshots and its dependends.
3401          */
3402         cb.cb_force = force;
3403         cb.cb_target = snap->zfs_name;
3404         cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
3405         (void) zfs_iter_children(zhp, rollback_destroy, &cb);
3406
3407         if (cb.cb_error)
3408                 return (-1);
3409
3410         /*
3411          * Now that we have verified that the snapshot is the latest,
3412          * rollback to the given snapshot.
3413          */
3414
3415         if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
3416                 if (zvol_remove_link(zhp->zfs_hdl, zhp->zfs_name) != 0)
3417                         return (-1);
3418                 if (zfs_which_resv_prop(zhp, &resv_prop) < 0)
3419                         return (-1);
3420                 old_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
3421                 restore_resv =
3422                     (old_volsize == zfs_prop_get_int(zhp, resv_prop));
3423         }
3424
3425         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3426
3427         if (ZFS_IS_VOLUME(zhp))
3428                 zc.zc_objset_type = DMU_OST_ZVOL;
3429         else
3430                 zc.zc_objset_type = DMU_OST_ZFS;
3431
3432         /*
3433          * We rely on zfs_iter_children() to verify that there are no
3434          * newer snapshots for the given dataset.  Therefore, we can
3435          * simply pass the name on to the ioctl() call.  There is still
3436          * an unlikely race condition where the user has taken a
3437          * snapshot since we verified that this was the most recent.
3438          *
3439          */
3440         if ((err = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_ROLLBACK, &zc)) != 0) {
3441                 (void) zfs_standard_error_fmt(zhp->zfs_hdl, errno,
3442                     dgettext(TEXT_DOMAIN, "cannot rollback '%s'"),
3443                     zhp->zfs_name);
3444                 return (err);
3445         }
3446
3447         /*
3448          * For volumes, if the pre-rollback volsize matched the pre-
3449          * rollback reservation and the volsize has changed then set
3450          * the reservation property to the post-rollback volsize.
3451          * Make a new handle since the rollback closed the dataset.
3452          */
3453         if ((zhp->zfs_type == ZFS_TYPE_VOLUME) &&
3454             (zhp = make_dataset_handle(zhp->zfs_hdl, zhp->zfs_name))) {
3455                 if (err = zvol_create_link(zhp->zfs_hdl, zhp->zfs_name)) {
3456                         zfs_close(zhp);
3457                         return (err);
3458                 }
3459                 if (restore_resv) {
3460                         new_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
3461                         if (old_volsize != new_volsize)
3462                                 err = zfs_prop_set_int(zhp, resv_prop,
3463                                     new_volsize);
3464                 }
3465                 zfs_close(zhp);
3466         }
3467         return (err);
3468 }
3469
3470 /*
3471  * Iterate over all dependents for a given dataset.  This includes both
3472  * hierarchical dependents (children) and data dependents (snapshots and
3473  * clones).  The bulk of the processing occurs in get_dependents() in
3474  * libzfs_graph.c.
3475  */
3476 int
3477 zfs_iter_dependents(zfs_handle_t *zhp, boolean_t allowrecursion,
3478     zfs_iter_f func, void *data)
3479 {
3480         char **dependents;
3481         size_t count;
3482         int i;
3483         zfs_handle_t *child;
3484         int ret = 0;
3485
3486         if (get_dependents(zhp->zfs_hdl, allowrecursion, zhp->zfs_name,
3487             &dependents, &count) != 0)
3488                 return (-1);
3489
3490         for (i = 0; i < count; i++) {
3491                 if ((child = make_dataset_handle(zhp->zfs_hdl,
3492                     dependents[i])) == NULL)
3493                         continue;
3494
3495                 if ((ret = func(child, data)) != 0)
3496                         break;
3497         }
3498
3499         for (i = 0; i < count; i++)
3500                 free(dependents[i]);
3501         free(dependents);
3502
3503         return (ret);
3504 }
3505
3506 /*
3507  * Renames the given dataset.
3508  */
3509 int
3510 zfs_rename(zfs_handle_t *zhp, const char *target, boolean_t recursive)
3511 {
3512         int ret;
3513         zfs_cmd_t zc = { 0 };
3514         char *delim;
3515         prop_changelist_t *cl = NULL;
3516         zfs_handle_t *zhrp = NULL;
3517         char *parentname = NULL;
3518         char parent[ZFS_MAXNAMELEN];
3519         libzfs_handle_t *hdl = zhp->zfs_hdl;
3520         char errbuf[1024];
3521
3522         /* if we have the same exact name, just return success */
3523         if (strcmp(zhp->zfs_name, target) == 0)
3524                 return (0);
3525
3526         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3527             "cannot rename to '%s'"), target);
3528
3529         /*
3530          * Make sure the target name is valid
3531          */
3532         if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
3533                 if ((strchr(target, '@') == NULL) ||
3534                     *target == '@') {
3535                         /*
3536                          * Snapshot target name is abbreviated,
3537                          * reconstruct full dataset name
3538                          */
3539                         (void) strlcpy(parent, zhp->zfs_name,
3540                             sizeof (parent));
3541                         delim = strchr(parent, '@');
3542                         if (strchr(target, '@') == NULL)
3543                                 *(++delim) = '\0';
3544                         else
3545                                 *delim = '\0';
3546                         (void) strlcat(parent, target, sizeof (parent));
3547                         target = parent;
3548                 } else {
3549                         /*
3550                          * Make sure we're renaming within the same dataset.
3551                          */
3552                         delim = strchr(target, '@');
3553                         if (strncmp(zhp->zfs_name, target, delim - target)
3554                             != 0 || zhp->zfs_name[delim - target] != '@') {
3555                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3556                                     "snapshots must be part of same "
3557                                     "dataset"));
3558                                 return (zfs_error(hdl, EZFS_CROSSTARGET,
3559                                     errbuf));
3560                         }
3561                 }
3562                 if (!zfs_validate_name(hdl, target, zhp->zfs_type, B_TRUE))
3563                         return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3564         } else {
3565                 if (recursive) {
3566                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3567                             "recursive rename must be a snapshot"));
3568                         return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3569                 }
3570
3571                 if (!zfs_validate_name(hdl, target, zhp->zfs_type, B_TRUE))
3572                         return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3573                 uint64_t unused;
3574
3575                 /* validate parents */
3576                 if (check_parents(hdl, target, &unused, B_FALSE, NULL) != 0)
3577                         return (-1);
3578
3579                 (void) parent_name(target, parent, sizeof (parent));
3580
3581                 /* make sure we're in the same pool */
3582                 verify((delim = strchr(target, '/')) != NULL);
3583                 if (strncmp(zhp->zfs_name, target, delim - target) != 0 ||
3584                     zhp->zfs_name[delim - target] != '/') {
3585                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3586                             "datasets must be within same pool"));
3587                         return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
3588                 }
3589
3590                 /* new name cannot be a child of the current dataset name */
3591                 if (strncmp(parent, zhp->zfs_name,
3592                     strlen(zhp->zfs_name)) == 0) {
3593                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3594                             "New dataset name cannot be a descendent of "
3595                             "current dataset name"));
3596                         return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3597                 }
3598         }
3599
3600         (void) snprintf(errbuf, sizeof (errbuf),
3601             dgettext(TEXT_DOMAIN, "cannot rename '%s'"), zhp->zfs_name);
3602
3603         if (getzoneid() == GLOBAL_ZONEID &&
3604             zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) {
3605                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3606                     "dataset is used in a non-global zone"));
3607                 return (zfs_error(hdl, EZFS_ZONED, errbuf));
3608         }
3609
3610         if (recursive) {
3611                 struct destroydata dd;
3612
3613                 parentname = zfs_strdup(zhp->zfs_hdl, zhp->zfs_name);
3614                 if (parentname == NULL) {
3615                         ret = -1;
3616                         goto error;
3617                 }
3618                 delim = strchr(parentname, '@');
3619                 *delim = '\0';
3620                 zhrp = zfs_open(zhp->zfs_hdl, parentname, ZFS_TYPE_DATASET);
3621                 if (zhrp == NULL) {
3622                         ret = -1;
3623                         goto error;
3624                 }
3625
3626                 dd.snapname = delim + 1;
3627                 dd.gotone = B_FALSE;
3628                 dd.closezhp = B_TRUE;
3629
3630                 /* We remove any zvol links prior to renaming them */
3631                 ret = zfs_iter_filesystems(zhrp, zfs_remove_link_cb, &dd);
3632                 if (ret) {
3633                         goto error;
3634                 }
3635         } else {
3636                 if ((cl = changelist_gather(zhp, ZFS_PROP_NAME, 0, 0)) == NULL)
3637                         return (-1);
3638
3639                 if (changelist_haszonedchild(cl)) {
3640                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3641                             "child dataset with inherited mountpoint is used "
3642                             "in a non-global zone"));
3643                         (void) zfs_error(hdl, EZFS_ZONED, errbuf);
3644                         goto error;
3645                 }
3646
3647                 if ((ret = changelist_prefix(cl)) != 0)
3648                         goto error;
3649         }
3650
3651         if (ZFS_IS_VOLUME(zhp))
3652                 zc.zc_objset_type = DMU_OST_ZVOL;
3653         else
3654                 zc.zc_objset_type = DMU_OST_ZFS;
3655
3656         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3657         (void) strlcpy(zc.zc_value, target, sizeof (zc.zc_value));
3658
3659         zc.zc_cookie = recursive;
3660
3661         if ((ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_RENAME, &zc)) != 0) {
3662                 /*
3663                  * if it was recursive, the one that actually failed will
3664                  * be in zc.zc_name
3665                  */
3666                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3667                     "cannot rename '%s'"), zc.zc_name);
3668
3669                 if (recursive && errno == EEXIST) {
3670                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3671                             "a child dataset already has a snapshot "
3672                             "with the new name"));
3673                         (void) zfs_error(hdl, EZFS_EXISTS, errbuf);
3674                 } else {
3675                         (void) zfs_standard_error(zhp->zfs_hdl, errno, errbuf);
3676                 }
3677
3678                 /*
3679                  * On failure, we still want to remount any filesystems that
3680                  * were previously mounted, so we don't alter the system state.
3681                  */
3682                 if (recursive) {
3683                         struct createdata cd;
3684
3685                         /* only create links for datasets that had existed */
3686                         cd.cd_snapname = delim + 1;
3687                         cd.cd_ifexists = B_TRUE;
3688                         (void) zfs_iter_filesystems(zhrp, zfs_create_link_cb,
3689                             &cd);
3690                 } else {
3691                         (void) changelist_postfix(cl);
3692                 }
3693         } else {
3694                 if (recursive) {
3695                         struct createdata cd;
3696
3697                         /* only create links for datasets that had existed */
3698                         cd.cd_snapname = strchr(target, '@') + 1;
3699                         cd.cd_ifexists = B_TRUE;
3700                         ret = zfs_iter_filesystems(zhrp, zfs_create_link_cb,
3701                             &cd);
3702                 } else {
3703                         changelist_rename(cl, zfs_get_name(zhp), target);
3704                         ret = changelist_postfix(cl);
3705                 }
3706         }
3707
3708 error:
3709         if (parentname) {
3710                 free(parentname);
3711         }
3712         if (zhrp) {
3713                 zfs_close(zhrp);
3714         }
3715         if (cl) {
3716                 changelist_free(cl);
3717         }
3718         return (ret);
3719 }
3720
3721 /*
3722  * Given a zvol dataset, issue the ioctl to create the appropriate minor node,
3723  * poke devfsadm to create the /dev link, and then wait for the link to appear.
3724  */
3725 int
3726 zvol_create_link(libzfs_handle_t *hdl, const char *dataset)
3727 {
3728         return (zvol_create_link_common(hdl, dataset, B_FALSE));
3729 }
3730
3731 static int
3732 zvol_create_link_common(libzfs_handle_t *hdl, const char *dataset, int ifexists)
3733 {
3734         zfs_cmd_t zc = { 0 };
3735 #if 0
3736         di_devlink_handle_t dhdl;
3737         priv_set_t *priv_effective;
3738         int privileged;
3739 #endif
3740
3741         (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
3742
3743         /*
3744          * Issue the appropriate ioctl.
3745          */
3746         if (ioctl(hdl->libzfs_fd, ZFS_IOC_CREATE_MINOR, &zc) != 0) {
3747                 switch (errno) {
3748                 case EEXIST:
3749                         /*
3750                          * Silently ignore the case where the link already
3751                          * exists.  This allows 'zfs volinit' to be run multiple
3752                          * times without errors.
3753                          */
3754                         return (0);
3755
3756                 case ENOENT:
3757                         /*
3758                          * Dataset does not exist in the kernel.  If we
3759                          * don't care (see zfs_rename), then ignore the
3760                          * error quietly.
3761                          */
3762                         if (ifexists) {
3763                                 return (0);
3764                         }
3765
3766                         /* FALLTHROUGH */
3767
3768                 default:
3769                         return (zfs_standard_error_fmt(hdl, errno,
3770                             dgettext(TEXT_DOMAIN, "cannot create device links "
3771                             "for '%s'"), dataset));
3772                 }
3773         }
3774
3775 #if 0
3776         /*
3777          * If privileged call devfsadm and wait for the links to
3778          * magically appear.
3779          * Otherwise, print out an informational message.
3780          */
3781
3782         priv_effective = priv_allocset();
3783         (void) getppriv(PRIV_EFFECTIVE, priv_effective);
3784         privileged = (priv_isfullset(priv_effective) == B_TRUE);
3785         priv_freeset(priv_effective);
3786
3787         if (privileged) {
3788                 if ((dhdl = di_devlink_init(ZFS_DRIVER,
3789                     DI_MAKE_LINK)) == NULL) {
3790                         zfs_error_aux(hdl, strerror(errno));
3791                         (void) zfs_error_fmt(hdl, errno,
3792                             dgettext(TEXT_DOMAIN, "cannot create device links "
3793                             "for '%s'"), dataset);
3794                         (void) ioctl(hdl->libzfs_fd, ZFS_IOC_REMOVE_MINOR, &zc);
3795                         return (-1);
3796                 } else {
3797                         (void) di_devlink_fini(&dhdl);
3798                 }
3799         } else {
3800                 char pathname[MAXPATHLEN];
3801                 struct stat64 statbuf;
3802                 int i;
3803
3804 #define MAX_WAIT        10
3805
3806                 /*
3807                  * This is the poor mans way of waiting for the link
3808                  * to show up.  If after 10 seconds we still don't
3809                  * have it, then print out a message.
3810                  */
3811                 (void) snprintf(pathname, sizeof (pathname), "/dev/zvol/dsk/%s",
3812                     dataset);
3813
3814                 for (i = 0; i != MAX_WAIT; i++) {
3815                         if (stat64(pathname, &statbuf) == 0)
3816                                 break;
3817                         (void) sleep(1);
3818                 }
3819                 if (i == MAX_WAIT)
3820                         (void) printf(gettext("%s may not be immediately "
3821                             "available\n"), pathname);
3822         }
3823 #endif
3824
3825         return (0);
3826 }
3827
3828 /*
3829  * Remove a minor node for the given zvol and the associated /dev links.
3830  */
3831 int
3832 zvol_remove_link(libzfs_handle_t *hdl, const char *dataset)
3833 {
3834         zfs_cmd_t zc = { 0 };
3835
3836         (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
3837
3838         if (ioctl(hdl->libzfs_fd, ZFS_IOC_REMOVE_MINOR, &zc) != 0) {
3839                 switch (errno) {
3840                 case ENXIO:
3841                         /*
3842                          * Silently ignore the case where the link no longer
3843                          * exists, so that 'zfs volfini' can be run multiple
3844                          * times without errors.
3845                          */
3846                         return (0);
3847
3848                 default:
3849                         return (zfs_standard_error_fmt(hdl, errno,
3850                             dgettext(TEXT_DOMAIN, "cannot remove device "
3851                             "links for '%s'"), dataset));
3852                 }
3853         }
3854
3855         return (0);
3856 }
3857
3858 nvlist_t *
3859 zfs_get_user_props(zfs_handle_t *zhp)
3860 {
3861         return (zhp->zfs_user_props);
3862 }
3863
3864 /*
3865  * This function is used by 'zfs list' to determine the exact set of columns to
3866  * display, and their maximum widths.  This does two main things:
3867  *
3868  *      - If this is a list of all properties, then expand the list to include
3869  *        all native properties, and set a flag so that for each dataset we look
3870  *        for new unique user properties and add them to the list.
3871  *
3872  *      - For non fixed-width properties, keep track of the maximum width seen
3873  *        so that we can size the column appropriately.
3874  */
3875 int
3876 zfs_expand_proplist(zfs_handle_t *zhp, zprop_list_t **plp)
3877 {
3878         libzfs_handle_t *hdl = zhp->zfs_hdl;
3879         zprop_list_t *entry;
3880         zprop_list_t **last, **start;
3881         nvlist_t *userprops, *propval;
3882         nvpair_t *elem;
3883         char *strval;
3884         char buf[ZFS_MAXPROPLEN];
3885
3886         if (zprop_expand_list(hdl, plp, ZFS_TYPE_DATASET) != 0)
3887                 return (-1);
3888
3889         userprops = zfs_get_user_props(zhp);
3890
3891         entry = *plp;
3892         if (entry->pl_all && nvlist_next_nvpair(userprops, NULL) != NULL) {
3893                 /*
3894                  * Go through and add any user properties as necessary.  We
3895                  * start by incrementing our list pointer to the first
3896                  * non-native property.
3897                  */
3898                 start = plp;
3899                 while (*start != NULL) {
3900                         if ((*start)->pl_prop == ZPROP_INVAL)
3901                                 break;
3902                         start = &(*start)->pl_next;
3903                 }
3904
3905                 elem = NULL;
3906                 while ((elem = nvlist_next_nvpair(userprops, elem)) != NULL) {
3907                         /*
3908                          * See if we've already found this property in our list.
3909                          */
3910                         for (last = start; *last != NULL;
3911                             last = &(*last)->pl_next) {
3912                                 if (strcmp((*last)->pl_user_prop,
3913                                     nvpair_name(elem)) == 0)
3914                                         break;
3915                         }
3916
3917                         if (*last == NULL) {
3918                                 if ((entry = zfs_alloc(hdl,
3919                                     sizeof (zprop_list_t))) == NULL ||
3920                                     ((entry->pl_user_prop = zfs_strdup(hdl,
3921                                     nvpair_name(elem)))) == NULL) {
3922                                         free(entry);
3923                                         return (-1);
3924                                 }
3925
3926                                 entry->pl_prop = ZPROP_INVAL;
3927                                 entry->pl_width = strlen(nvpair_name(elem));
3928                                 entry->pl_all = B_TRUE;
3929                                 *last = entry;
3930                         }
3931                 }
3932         }
3933
3934         /*
3935          * Now go through and check the width of any non-fixed columns
3936          */
3937         for (entry = *plp; entry != NULL; entry = entry->pl_next) {
3938                 if (entry->pl_fixed)
3939                         continue;
3940
3941                 if (entry->pl_prop != ZPROP_INVAL) {
3942                         if (zfs_prop_get(zhp, entry->pl_prop,
3943                             buf, sizeof (buf), NULL, NULL, 0, B_FALSE) == 0) {
3944                                 if (strlen(buf) > entry->pl_width)
3945                                         entry->pl_width = strlen(buf);
3946                         }
3947                 } else if (nvlist_lookup_nvlist(userprops,
3948                     entry->pl_user_prop, &propval)  == 0) {
3949                         verify(nvlist_lookup_string(propval,
3950                             ZPROP_VALUE, &strval) == 0);
3951                         if (strlen(strval) > entry->pl_width)
3952                                 entry->pl_width = strlen(strval);
3953                 }
3954         }
3955
3956         return (0);
3957 }
3958
3959 #ifdef TODO
3960 int
3961 zfs_iscsi_perm_check(libzfs_handle_t *hdl, char *dataset, ucred_t *cred)
3962 {
3963         zfs_cmd_t zc = { 0 };
3964         nvlist_t *nvp;
3965         gid_t gid;
3966         uid_t uid;
3967         const gid_t *groups;
3968         int group_cnt;
3969         int error;
3970
3971         if (nvlist_alloc(&nvp, NV_UNIQUE_NAME, 0) != 0)
3972                 return (no_memory(hdl));
3973
3974         uid = ucred_geteuid(cred);
3975         gid = ucred_getegid(cred);
3976         group_cnt = ucred_getgroups(cred, &groups);
3977
3978         if (uid == (uid_t)-1 || gid == (uid_t)-1 || group_cnt == (uid_t)-1)
3979                 return (1);
3980
3981         if (nvlist_add_uint32(nvp, ZFS_DELEG_PERM_UID, uid) != 0) {
3982                 nvlist_free(nvp);
3983                 return (1);
3984         }
3985
3986         if (nvlist_add_uint32(nvp, ZFS_DELEG_PERM_GID, gid) != 0) {
3987                 nvlist_free(nvp);
3988                 return (1);
3989         }
3990
3991         if (nvlist_add_uint32_array(nvp,
3992             ZFS_DELEG_PERM_GROUPS, (uint32_t *)groups, group_cnt) != 0) {
3993                 nvlist_free(nvp);
3994                 return (1);
3995         }
3996         (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
3997
3998         if (zcmd_write_src_nvlist(hdl, &zc, nvp))
3999                 return (-1);
4000
4001         error = ioctl(hdl->libzfs_fd, ZFS_IOC_ISCSI_PERM_CHECK, &zc);
4002         nvlist_free(nvp);
4003         return (error);
4004 }
4005 #endif
4006
4007 int
4008 zfs_deleg_share_nfs(libzfs_handle_t *hdl, char *dataset, char *path,
4009     char *resource, void *export, void *sharetab,
4010     int sharemax, zfs_share_op_t operation)
4011 {
4012         zfs_cmd_t zc = { 0 };
4013         int error;
4014
4015         (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
4016         (void) strlcpy(zc.zc_value, path, sizeof (zc.zc_value));
4017         if (resource)
4018                 (void) strlcpy(zc.zc_string, resource, sizeof (zc.zc_string));
4019         zc.zc_share.z_sharedata = (uint64_t)(uintptr_t)sharetab;
4020         zc.zc_share.z_exportdata = (uint64_t)(uintptr_t)export;
4021         zc.zc_share.z_sharetype = operation;
4022         zc.zc_share.z_sharemax = sharemax;
4023         error = ioctl(hdl->libzfs_fd, ZFS_IOC_SHARE, &zc);
4024         return (error);
4025 }
4026
4027 void
4028 zfs_prune_proplist(zfs_handle_t *zhp, uint8_t *props)
4029 {
4030         nvpair_t *curr;
4031
4032         /*
4033          * Keep a reference to the props-table against which we prune the
4034          * properties.
4035          */
4036         zhp->zfs_props_table = props;
4037
4038         curr = nvlist_next_nvpair(zhp->zfs_props, NULL);
4039
4040         while (curr) {
4041                 zfs_prop_t zfs_prop = zfs_name_to_prop(nvpair_name(curr));
4042                 nvpair_t *next = nvlist_next_nvpair(zhp->zfs_props, curr);
4043
4044                 /*
4045                  * We leave user:props in the nvlist, so there will be
4046                  * some ZPROP_INVAL.  To be extra safe, don't prune
4047                  * those.
4048                  */
4049                 if (zfs_prop != ZPROP_INVAL && props[zfs_prop] == B_FALSE)
4050                         (void) nvlist_remove(zhp->zfs_props,
4051                             nvpair_name(curr), nvpair_type(curr));
4052                 curr = next;
4053         }
4054 }
4055
4056 #ifdef sun
4057 static int
4058 zfs_smb_acl_mgmt(libzfs_handle_t *hdl, char *dataset, char *path,
4059     zfs_smb_acl_op_t cmd, char *resource1, char *resource2)
4060 {
4061         zfs_cmd_t zc = { 0 };
4062         nvlist_t *nvlist = NULL;
4063         int error;
4064
4065         (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
4066         (void) strlcpy(zc.zc_value, path, sizeof (zc.zc_value));
4067         zc.zc_cookie = (uint64_t)cmd;
4068
4069         if (cmd == ZFS_SMB_ACL_RENAME) {
4070                 if (nvlist_alloc(&nvlist, NV_UNIQUE_NAME, 0) != 0) {
4071                         (void) no_memory(hdl);
4072                         return (NULL);
4073                 }
4074         }
4075
4076         switch (cmd) {
4077         case ZFS_SMB_ACL_ADD:
4078         case ZFS_SMB_ACL_REMOVE:
4079                 (void) strlcpy(zc.zc_string, resource1, sizeof (zc.zc_string));
4080                 break;
4081         case ZFS_SMB_ACL_RENAME:
4082                 if (nvlist_add_string(nvlist, ZFS_SMB_ACL_SRC,
4083                     resource1) != 0) {
4084                                 (void) no_memory(hdl);
4085                                 return (-1);
4086                 }
4087                 if (nvlist_add_string(nvlist, ZFS_SMB_ACL_TARGET,
4088                     resource2) != 0) {
4089                                 (void) no_memory(hdl);
4090                                 return (-1);
4091                 }
4092                 if (zcmd_write_src_nvlist(hdl, &zc, nvlist) != 0) {
4093                         nvlist_free(nvlist);
4094                         return (-1);
4095                 }
4096                 break;
4097         case ZFS_SMB_ACL_PURGE:
4098                 break;
4099         default:
4100                 return (-1);
4101         }
4102         error = ioctl(hdl->libzfs_fd, ZFS_IOC_SMB_ACL, &zc);
4103         if (nvlist)
4104                 nvlist_free(nvlist);
4105         return (error);
4106 }
4107
4108 int
4109 zfs_smb_acl_add(libzfs_handle_t *hdl, char *dataset,
4110     char *path, char *resource)
4111 {
4112         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_ADD,
4113             resource, NULL));
4114 }
4115
4116 int
4117 zfs_smb_acl_remove(libzfs_handle_t *hdl, char *dataset,
4118     char *path, char *resource)
4119 {
4120         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_REMOVE,
4121             resource, NULL));
4122 }
4123
4124 int
4125 zfs_smb_acl_purge(libzfs_handle_t *hdl, char *dataset, char *path)
4126 {
4127         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_PURGE,
4128             NULL, NULL));
4129 }
4130
4131 int
4132 zfs_smb_acl_rename(libzfs_handle_t *hdl, char *dataset, char *path,
4133     char *oldname, char *newname)
4134 {
4135         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_RENAME,
4136             oldname, newname));
4137 }
4138 #endif  /* sun */
4139
4140 int
4141 zfs_userspace(zfs_handle_t *zhp, zfs_userquota_prop_t type,
4142     zfs_userspace_cb_t func, void *arg)
4143 {
4144         zfs_cmd_t zc = { 0 };
4145         int error;
4146         zfs_useracct_t buf[100];
4147
4148         (void) strncpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
4149
4150         zc.zc_objset_type = type;
4151         zc.zc_nvlist_dst = (uintptr_t)buf;
4152
4153         /* CONSTCOND */
4154         while (1) {
4155                 zfs_useracct_t *zua = buf;
4156
4157                 zc.zc_nvlist_dst_size = sizeof (buf);
4158                 error = ioctl(zhp->zfs_hdl->libzfs_fd,
4159                     ZFS_IOC_USERSPACE_MANY, &zc);
4160                 if (error || zc.zc_nvlist_dst_size == 0)
4161                         break;
4162
4163                 while (zc.zc_nvlist_dst_size > 0) {
4164                         error = func(arg, zua->zu_domain, zua->zu_rid,
4165                             zua->zu_space);
4166                         if (error != 0)
4167                                 return (error);
4168                         zua++;
4169                         zc.zc_nvlist_dst_size -= sizeof (zfs_useracct_t);
4170                 }
4171         }
4172
4173         return (error);
4174 }
4175
4176 /*
4177  * Attach/detach the given filesystem to/from the given jail.
4178  */
4179 int
4180 zfs_jail(zfs_handle_t *zhp, int jailid, int attach)
4181 {
4182         libzfs_handle_t *hdl = zhp->zfs_hdl;
4183         zfs_cmd_t zc = { 0 };
4184         char errbuf[1024];
4185         int cmd, ret;
4186
4187         if (attach) {
4188                 (void) snprintf(errbuf, sizeof (errbuf),
4189                     dgettext(TEXT_DOMAIN, "cannot jail '%s'"), zhp->zfs_name);
4190         } else {
4191                 (void) snprintf(errbuf, sizeof (errbuf),
4192                     dgettext(TEXT_DOMAIN, "cannot jail '%s'"), zhp->zfs_name);
4193         }
4194
4195         switch (zhp->zfs_type) {
4196         case ZFS_TYPE_VOLUME:
4197                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4198                     "volumes can not be jailed"));
4199                 return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
4200         case ZFS_TYPE_SNAPSHOT:
4201                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4202                     "snapshots can not be jailed"));
4203                 return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
4204         }
4205         assert(zhp->zfs_type == ZFS_TYPE_FILESYSTEM);
4206
4207         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
4208         zc.zc_objset_type = DMU_OST_ZFS;
4209         zc.zc_jailid = jailid;
4210
4211         cmd = attach ? ZFS_IOC_JAIL : ZFS_IOC_UNJAIL;
4212         if ((ret = ioctl(hdl->libzfs_fd, cmd, &zc)) != 0)
4213                 zfs_standard_error(hdl, errno, errbuf);
4214
4215         return (ret);
4216 }