1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright 2010 Nexenta Systems, Inc. All rights reserved.
  25  * Copyright (c) 2012 by Delphix. All rights reserved.
  26  * Copyright (c) 2012 DEY Storage Systems, Inc.  All rights reserved.
  27  */
  28 
  29 #include <ctype.h>
  30 #include <errno.h>
  31 #include <libintl.h>
  32 #include <math.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <strings.h>
  36 #include <unistd.h>
  37 #include <stddef.h>
  38 #include <zone.h>
  39 #include <fcntl.h>
  40 #include <sys/mntent.h>
  41 #include <sys/mount.h>
  42 #include <priv.h>
  43 #include <pwd.h>
  44 #include <grp.h>
  45 #include <stddef.h>
  46 #include <ucred.h>
  47 #include <idmap.h>
  48 #include <aclutils.h>
  49 #include <directory.h>
  50 
  51 #include <sys/dnode.h>
  52 #include <sys/spa.h>
  53 #include <sys/zap.h>
  54 #include <libzfs.h>
  55 
  56 #include "zfs_namecheck.h"
  57 #include "zfs_prop.h"
  58 #include "libzfs_impl.h"
  59 #include "zfs_deleg.h"
  60 
  61 static int userquota_propname_decode(const char *propname, boolean_t zoned,
  62     zfs_userquota_prop_t *typep, char *domain, int domainlen, uint64_t *ridp);
  63 
  64 /*
  65  * Given a single type (not a mask of types), return the type in a human
  66  * readable form.
  67  */
  68 const char *
  69 zfs_type_to_name(zfs_type_t type)
  70 {
  71         switch (type) {
  72         case ZFS_TYPE_FILESYSTEM:
  73                 return (dgettext(TEXT_DOMAIN, "filesystem"));
  74         case ZFS_TYPE_SNAPSHOT:
  75                 return (dgettext(TEXT_DOMAIN, "snapshot"));
  76         case ZFS_TYPE_VOLUME:
  77                 return (dgettext(TEXT_DOMAIN, "volume"));
  78         }
  79 
  80         return (NULL);
  81 }
  82 
  83 /*
  84  * Given a path and mask of ZFS types, return a string describing this dataset.
  85  * This is used when we fail to open a dataset and we cannot get an exact type.
  86  * We guess what the type would have been based on the path and the mask of
  87  * acceptable types.
  88  */
  89 static const char *
  90 path_to_str(const char *path, int types)
  91 {
  92         /*
  93          * When given a single type, always report the exact type.
  94          */
  95         if (types == ZFS_TYPE_SNAPSHOT)
  96                 return (dgettext(TEXT_DOMAIN, "snapshot"));
  97         if (types == ZFS_TYPE_FILESYSTEM)
  98                 return (dgettext(TEXT_DOMAIN, "filesystem"));
  99         if (types == ZFS_TYPE_VOLUME)
 100                 return (dgettext(TEXT_DOMAIN, "volume"));
 101 
 102         /*
 103          * The user is requesting more than one type of dataset.  If this is the
 104          * case, consult the path itself.  If we're looking for a snapshot, and
 105          * a '@' is found, then report it as "snapshot".  Otherwise, remove the
 106          * snapshot attribute and try again.
 107          */
 108         if (types & ZFS_TYPE_SNAPSHOT) {
 109                 if (strchr(path, '@') != NULL)
 110                         return (dgettext(TEXT_DOMAIN, "snapshot"));
 111                 return (path_to_str(path, types & ~ZFS_TYPE_SNAPSHOT));
 112         }
 113 
 114         /*
 115          * The user has requested either filesystems or volumes.
 116          * We have no way of knowing a priori what type this would be, so always
 117          * report it as "filesystem" or "volume", our two primitive types.
 118          */
 119         if (types & ZFS_TYPE_FILESYSTEM)
 120                 return (dgettext(TEXT_DOMAIN, "filesystem"));
 121 
 122         assert(types & ZFS_TYPE_VOLUME);
 123         return (dgettext(TEXT_DOMAIN, "volume"));
 124 }
 125 
 126 /*
 127  * Validate a ZFS path.  This is used even before trying to open the dataset, to
 128  * provide a more meaningful error message.  We call zfs_error_aux() to
 129  * explain exactly why the name was not valid.
 130  */
 131 int
 132 zfs_validate_name(libzfs_handle_t *hdl, const char *path, int type,
 133     boolean_t modifying)
 134 {
 135         namecheck_err_t why;
 136         char what;
 137 
 138         (void) zfs_prop_get_table();
 139         if (dataset_namecheck(path, &why, &what) != 0) {
 140                 if (hdl != NULL) {
 141                         switch (why) {
 142                         case NAME_ERR_TOOLONG:
 143                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 144                                     "name is too long"));
 145                                 break;
 146 
 147                         case NAME_ERR_LEADING_SLASH:
 148                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 149                                     "leading slash in name"));
 150                                 break;
 151 
 152                         case NAME_ERR_EMPTY_COMPONENT:
 153                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 154                                     "empty component in name"));
 155                                 break;
 156 
 157                         case NAME_ERR_TRAILING_SLASH:
 158                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 159                                     "trailing slash in name"));
 160                                 break;
 161 
 162                         case NAME_ERR_INVALCHAR:
 163                                 zfs_error_aux(hdl,
 164                                     dgettext(TEXT_DOMAIN, "invalid character "
 165                                     "'%c' in name"), what);
 166                                 break;
 167 
 168                         case NAME_ERR_MULTIPLE_AT:
 169                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 170                                     "multiple '@' delimiters in name"));
 171                                 break;
 172 
 173                         case NAME_ERR_NOLETTER:
 174                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 175                                     "pool doesn't begin with a letter"));
 176                                 break;
 177 
 178                         case NAME_ERR_RESERVED:
 179                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 180                                     "name is reserved"));
 181                                 break;
 182 
 183                         case NAME_ERR_DISKLIKE:
 184                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 185                                     "reserved disk name"));
 186                                 break;
 187                         }
 188                 }
 189 
 190                 return (0);
 191         }
 192 
 193         if (!(type & ZFS_TYPE_SNAPSHOT) && strchr(path, '@') != NULL) {
 194                 if (hdl != NULL)
 195                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 196                             "snapshot delimiter '@' in filesystem name"));
 197                 return (0);
 198         }
 199 
 200         if (type == ZFS_TYPE_SNAPSHOT && strchr(path, '@') == NULL) {
 201                 if (hdl != NULL)
 202                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 203                             "missing '@' delimiter in snapshot name"));
 204                 return (0);
 205         }
 206 
 207         if (modifying && strchr(path, '%') != NULL) {
 208                 if (hdl != NULL)
 209                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 210                             "invalid character %c in name"), '%');
 211                 return (0);
 212         }
 213 
 214         return (-1);
 215 }
 216 
 217 int
 218 zfs_name_valid(const char *name, zfs_type_t type)
 219 {
 220         if (type == ZFS_TYPE_POOL)
 221                 return (zpool_name_valid(NULL, B_FALSE, name));
 222         return (zfs_validate_name(NULL, name, type, B_FALSE));
 223 }
 224 
 225 /*
 226  * This function takes the raw DSL properties, and filters out the user-defined
 227  * properties into a separate nvlist.
 228  */
 229 static nvlist_t *
 230 process_user_props(zfs_handle_t *zhp, nvlist_t *props)
 231 {
 232         libzfs_handle_t *hdl = zhp->zfs_hdl;
 233         nvpair_t *elem;
 234         nvlist_t *propval;
 235         nvlist_t *nvl;
 236 
 237         if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0) {
 238                 (void) no_memory(hdl);
 239                 return (NULL);
 240         }
 241 
 242         elem = NULL;
 243         while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
 244                 if (!zfs_prop_user(nvpair_name(elem)))
 245                         continue;
 246 
 247                 verify(nvpair_value_nvlist(elem, &propval) == 0);
 248                 if (nvlist_add_nvlist(nvl, nvpair_name(elem), propval) != 0) {
 249                         nvlist_free(nvl);
 250                         (void) no_memory(hdl);
 251                         return (NULL);
 252                 }
 253         }
 254 
 255         return (nvl);
 256 }
 257 
 258 static zpool_handle_t *
 259 zpool_add_handle(zfs_handle_t *zhp, const char *pool_name)
 260 {
 261         libzfs_handle_t *hdl = zhp->zfs_hdl;
 262         zpool_handle_t *zph;
 263 
 264         if ((zph = zpool_open_canfail(hdl, pool_name)) != NULL) {
 265                 if (hdl->libzfs_pool_handles != NULL)
 266                         zph->zpool_next = hdl->libzfs_pool_handles;
 267                 hdl->libzfs_pool_handles = zph;
 268         }
 269         return (zph);
 270 }
 271 
 272 static zpool_handle_t *
 273 zpool_find_handle(zfs_handle_t *zhp, const char *pool_name, int len)
 274 {
 275         libzfs_handle_t *hdl = zhp->zfs_hdl;
 276         zpool_handle_t *zph = hdl->libzfs_pool_handles;
 277 
 278         while ((zph != NULL) &&
 279             (strncmp(pool_name, zpool_get_name(zph), len) != 0))
 280                 zph = zph->zpool_next;
 281         return (zph);
 282 }
 283 
 284 /*
 285  * Returns a handle to the pool that contains the provided dataset.
 286  * If a handle to that pool already exists then that handle is returned.
 287  * Otherwise, a new handle is created and added to the list of handles.
 288  */
 289 static zpool_handle_t *
 290 zpool_handle(zfs_handle_t *zhp)
 291 {
 292         char *pool_name;
 293         int len;
 294         zpool_handle_t *zph;
 295 
 296         len = strcspn(zhp->zfs_name, "/@") + 1;
 297         pool_name = zfs_alloc(zhp->zfs_hdl, len);
 298         (void) strlcpy(pool_name, zhp->zfs_name, len);
 299 
 300         zph = zpool_find_handle(zhp, pool_name, len);
 301         if (zph == NULL)
 302                 zph = zpool_add_handle(zhp, pool_name);
 303 
 304         free(pool_name);
 305         return (zph);
 306 }
 307 
 308 void
 309 zpool_free_handles(libzfs_handle_t *hdl)
 310 {
 311         zpool_handle_t *next, *zph = hdl->libzfs_pool_handles;
 312 
 313         while (zph != NULL) {
 314                 next = zph->zpool_next;
 315                 zpool_close(zph);
 316                 zph = next;
 317         }
 318         hdl->libzfs_pool_handles = NULL;
 319 }
 320 
 321 /*
 322  * Utility function to gather stats (objset and zpl) for the given object.
 323  */
 324 static int
 325 get_stats_ioctl(zfs_handle_t *zhp, zfs_cmd_t *zc)
 326 {
 327         libzfs_handle_t *hdl = zhp->zfs_hdl;
 328 
 329         (void) strlcpy(zc->zc_name, zhp->zfs_name, sizeof (zc->zc_name));
 330 
 331         while (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, zc) != 0) {
 332                 if (errno == ENOMEM) {
 333                         if (zcmd_expand_dst_nvlist(hdl, zc) != 0) {
 334                                 return (-1);
 335                         }
 336                 } else {
 337                         return (-1);
 338                 }
 339         }
 340         return (0);
 341 }
 342 
 343 /*
 344  * Utility function to get the received properties of the given object.
 345  */
 346 static int
 347 get_recvd_props_ioctl(zfs_handle_t *zhp)
 348 {
 349         libzfs_handle_t *hdl = zhp->zfs_hdl;
 350         nvlist_t *recvdprops;
 351         zfs_cmd_t zc = { 0 };
 352         int err;
 353 
 354         if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0)
 355                 return (-1);
 356 
 357         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
 358 
 359         while (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_RECVD_PROPS, &zc) != 0) {
 360                 if (errno == ENOMEM) {
 361                         if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
 362                                 return (-1);
 363                         }
 364                 } else {
 365                         zcmd_free_nvlists(&zc);
 366                         return (-1);
 367                 }
 368         }
 369 
 370         err = zcmd_read_dst_nvlist(zhp->zfs_hdl, &zc, &recvdprops);
 371         zcmd_free_nvlists(&zc);
 372         if (err != 0)
 373                 return (-1);
 374 
 375         nvlist_free(zhp->zfs_recvd_props);
 376         zhp->zfs_recvd_props = recvdprops;
 377 
 378         return (0);
 379 }
 380 
 381 static int
 382 put_stats_zhdl(zfs_handle_t *zhp, zfs_cmd_t *zc)
 383 {
 384         nvlist_t *allprops, *userprops;
 385 
 386         zhp->zfs_dmustats = zc->zc_objset_stats; /* structure assignment */
 387 
 388         if (zcmd_read_dst_nvlist(zhp->zfs_hdl, zc, &allprops) != 0) {
 389                 return (-1);
 390         }
 391 
 392         /*
 393          * XXX Why do we store the user props separately, in addition to
 394          * storing them in zfs_props?
 395          */
 396         if ((userprops = process_user_props(zhp, allprops)) == NULL) {
 397                 nvlist_free(allprops);
 398                 return (-1);
 399         }
 400 
 401         nvlist_free(zhp->zfs_props);
 402         nvlist_free(zhp->zfs_user_props);
 403 
 404         zhp->zfs_props = allprops;
 405         zhp->zfs_user_props = userprops;
 406 
 407         return (0);
 408 }
 409 
 410 static int
 411 get_stats(zfs_handle_t *zhp)
 412 {
 413         int rc = 0;
 414         zfs_cmd_t zc = { 0 };
 415 
 416         if (zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
 417                 return (-1);
 418         if (get_stats_ioctl(zhp, &zc) != 0)
 419                 rc = -1;
 420         else if (put_stats_zhdl(zhp, &zc) != 0)
 421                 rc = -1;
 422         zcmd_free_nvlists(&zc);
 423         return (rc);
 424 }
 425 
 426 /*
 427  * Refresh the properties currently stored in the handle.
 428  */
 429 void
 430 zfs_refresh_properties(zfs_handle_t *zhp)
 431 {
 432         (void) get_stats(zhp);
 433 }
 434 
 435 /*
 436  * Makes a handle from the given dataset name.  Used by zfs_open() and
 437  * zfs_iter_* to create child handles on the fly.
 438  */
 439 static int
 440 make_dataset_handle_common(zfs_handle_t *zhp, zfs_cmd_t *zc)
 441 {
 442         if (put_stats_zhdl(zhp, zc) != 0)
 443                 return (-1);
 444 
 445         /*
 446          * We've managed to open the dataset and gather statistics.  Determine
 447          * the high-level type.
 448          */
 449         if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
 450                 zhp->zfs_head_type = ZFS_TYPE_VOLUME;
 451         else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
 452                 zhp->zfs_head_type = ZFS_TYPE_FILESYSTEM;
 453         else
 454                 abort();
 455 
 456         if (zhp->zfs_dmustats.dds_is_snapshot)
 457                 zhp->zfs_type = ZFS_TYPE_SNAPSHOT;
 458         else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
 459                 zhp->zfs_type = ZFS_TYPE_VOLUME;
 460         else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
 461                 zhp->zfs_type = ZFS_TYPE_FILESYSTEM;
 462         else
 463                 abort();        /* we should never see any other types */
 464 
 465         if ((zhp->zpool_hdl = zpool_handle(zhp)) == NULL)
 466                 return (-1);
 467 
 468         return (0);
 469 }
 470 
 471 zfs_handle_t *
 472 make_dataset_handle(libzfs_handle_t *hdl, const char *path)
 473 {
 474         zfs_cmd_t zc = { 0 };
 475 
 476         zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
 477 
 478         if (zhp == NULL)
 479                 return (NULL);
 480 
 481         zhp->zfs_hdl = hdl;
 482         (void) strlcpy(zhp->zfs_name, path, sizeof (zhp->zfs_name));
 483         if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0) {
 484                 free(zhp);
 485                 return (NULL);
 486         }
 487         if (get_stats_ioctl(zhp, &zc) == -1) {
 488                 zcmd_free_nvlists(&zc);
 489                 free(zhp);
 490                 return (NULL);
 491         }
 492         if (make_dataset_handle_common(zhp, &zc) == -1) {
 493                 free(zhp);
 494                 zhp = NULL;
 495         }
 496         zcmd_free_nvlists(&zc);
 497         return (zhp);
 498 }
 499 
 500 zfs_handle_t *
 501 make_dataset_handle_zc(libzfs_handle_t *hdl, zfs_cmd_t *zc)
 502 {
 503         zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
 504 
 505         if (zhp == NULL)
 506                 return (NULL);
 507 
 508         zhp->zfs_hdl = hdl;
 509         (void) strlcpy(zhp->zfs_name, zc->zc_name, sizeof (zhp->zfs_name));
 510         if (make_dataset_handle_common(zhp, zc) == -1) {
 511                 free(zhp);
 512                 return (NULL);
 513         }
 514         return (zhp);
 515 }
 516 
 517 zfs_handle_t *
 518 zfs_handle_dup(zfs_handle_t *zhp_orig)
 519 {
 520         zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
 521 
 522         if (zhp == NULL)
 523                 return (NULL);
 524 
 525         zhp->zfs_hdl = zhp_orig->zfs_hdl;
 526         zhp->zpool_hdl = zhp_orig->zpool_hdl;
 527         (void) strlcpy(zhp->zfs_name, zhp_orig->zfs_name,
 528             sizeof (zhp->zfs_name));
 529         zhp->zfs_type = zhp_orig->zfs_type;
 530         zhp->zfs_head_type = zhp_orig->zfs_head_type;
 531         zhp->zfs_dmustats = zhp_orig->zfs_dmustats;
 532         if (zhp_orig->zfs_props != NULL) {
 533                 if (nvlist_dup(zhp_orig->zfs_props, &zhp->zfs_props, 0) != 0) {
 534                         (void) no_memory(zhp->zfs_hdl);
 535                         zfs_close(zhp);
 536                         return (NULL);
 537                 }
 538         }
 539         if (zhp_orig->zfs_user_props != NULL) {
 540                 if (nvlist_dup(zhp_orig->zfs_user_props,
 541                     &zhp->zfs_user_props, 0) != 0) {
 542                         (void) no_memory(zhp->zfs_hdl);
 543                         zfs_close(zhp);
 544                         return (NULL);
 545                 }
 546         }
 547         if (zhp_orig->zfs_recvd_props != NULL) {
 548                 if (nvlist_dup(zhp_orig->zfs_recvd_props,
 549                     &zhp->zfs_recvd_props, 0)) {
 550                         (void) no_memory(zhp->zfs_hdl);
 551                         zfs_close(zhp);
 552                         return (NULL);
 553                 }
 554         }
 555         zhp->zfs_mntcheck = zhp_orig->zfs_mntcheck;
 556         if (zhp_orig->zfs_mntopts != NULL) {
 557                 zhp->zfs_mntopts = zfs_strdup(zhp_orig->zfs_hdl,
 558                     zhp_orig->zfs_mntopts);
 559         }
 560         zhp->zfs_props_table = zhp_orig->zfs_props_table;
 561         return (zhp);
 562 }
 563 
 564 /*
 565  * Opens the given snapshot, filesystem, or volume.   The 'types'
 566  * argument is a mask of acceptable types.  The function will print an
 567  * appropriate error message and return NULL if it can't be opened.
 568  */
 569 zfs_handle_t *
 570 zfs_open(libzfs_handle_t *hdl, const char *path, int types)
 571 {
 572         zfs_handle_t *zhp;
 573         char errbuf[1024];
 574 
 575         (void) snprintf(errbuf, sizeof (errbuf),
 576             dgettext(TEXT_DOMAIN, "cannot open '%s'"), path);
 577 
 578         /*
 579          * Validate the name before we even try to open it.
 580          */
 581         if (!zfs_validate_name(hdl, path, ZFS_TYPE_DATASET, B_FALSE)) {
 582                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 583                     "invalid dataset name"));
 584                 (void) zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
 585                 return (NULL);
 586         }
 587 
 588         /*
 589          * Try to get stats for the dataset, which will tell us if it exists.
 590          */
 591         errno = 0;
 592         if ((zhp = make_dataset_handle(hdl, path)) == NULL) {
 593                 (void) zfs_standard_error(hdl, errno, errbuf);
 594                 return (NULL);
 595         }
 596 
 597         if (!(types & zhp->zfs_type)) {
 598                 (void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
 599                 zfs_close(zhp);
 600                 return (NULL);
 601         }
 602 
 603         return (zhp);
 604 }
 605 
 606 /*
 607  * Release a ZFS handle.  Nothing to do but free the associated memory.
 608  */
 609 void
 610 zfs_close(zfs_handle_t *zhp)
 611 {
 612         if (zhp->zfs_mntopts)
 613                 free(zhp->zfs_mntopts);
 614         nvlist_free(zhp->zfs_props);
 615         nvlist_free(zhp->zfs_user_props);
 616         nvlist_free(zhp->zfs_recvd_props);
 617         free(zhp);
 618 }
 619 
 620 typedef struct mnttab_node {
 621         struct mnttab mtn_mt;
 622         avl_node_t mtn_node;
 623 } mnttab_node_t;
 624 
 625 static int
 626 libzfs_mnttab_cache_compare(const void *arg1, const void *arg2)
 627 {
 628         const mnttab_node_t *mtn1 = arg1;
 629         const mnttab_node_t *mtn2 = arg2;
 630         int rv;
 631 
 632         rv = strcmp(mtn1->mtn_mt.mnt_special, mtn2->mtn_mt.mnt_special);
 633 
 634         if (rv == 0)
 635                 return (0);
 636         return (rv > 0 ? 1 : -1);
 637 }
 638 
 639 void
 640 libzfs_mnttab_init(libzfs_handle_t *hdl)
 641 {
 642         assert(avl_numnodes(&hdl->libzfs_mnttab_cache) == 0);
 643         avl_create(&hdl->libzfs_mnttab_cache, libzfs_mnttab_cache_compare,
 644             sizeof (mnttab_node_t), offsetof(mnttab_node_t, mtn_node));
 645 }
 646 
 647 void
 648 libzfs_mnttab_update(libzfs_handle_t *hdl)
 649 {
 650         struct mnttab entry;
 651 
 652         rewind(hdl->libzfs_mnttab);
 653         while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
 654                 mnttab_node_t *mtn;
 655 
 656                 if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
 657                         continue;
 658                 mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
 659                 mtn->mtn_mt.mnt_special = zfs_strdup(hdl, entry.mnt_special);
 660                 mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, entry.mnt_mountp);
 661                 mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, entry.mnt_fstype);
 662                 mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, entry.mnt_mntopts);
 663                 avl_add(&hdl->libzfs_mnttab_cache, mtn);
 664         }
 665 }
 666 
 667 void
 668 libzfs_mnttab_fini(libzfs_handle_t *hdl)
 669 {
 670         void *cookie = NULL;
 671         mnttab_node_t *mtn;
 672 
 673         while (mtn = avl_destroy_nodes(&hdl->libzfs_mnttab_cache, &cookie)) {
 674                 free(mtn->mtn_mt.mnt_special);
 675                 free(mtn->mtn_mt.mnt_mountp);
 676                 free(mtn->mtn_mt.mnt_fstype);
 677                 free(mtn->mtn_mt.mnt_mntopts);
 678                 free(mtn);
 679         }
 680         avl_destroy(&hdl->libzfs_mnttab_cache);
 681 }
 682 
 683 void
 684 libzfs_mnttab_cache(libzfs_handle_t *hdl, boolean_t enable)
 685 {
 686         hdl->libzfs_mnttab_enable = enable;
 687 }
 688 
 689 int
 690 libzfs_mnttab_find(libzfs_handle_t *hdl, const char *fsname,
 691     struct mnttab *entry)
 692 {
 693         mnttab_node_t find;
 694         mnttab_node_t *mtn;
 695 
 696         if (!hdl->libzfs_mnttab_enable) {
 697                 struct mnttab srch = { 0 };
 698 
 699                 if (avl_numnodes(&hdl->libzfs_mnttab_cache))
 700                         libzfs_mnttab_fini(hdl);
 701                 rewind(hdl->libzfs_mnttab);
 702                 srch.mnt_special = (char *)fsname;
 703                 srch.mnt_fstype = MNTTYPE_ZFS;
 704                 if (getmntany(hdl->libzfs_mnttab, entry, &srch) == 0)
 705                         return (0);
 706                 else
 707                         return (ENOENT);
 708         }
 709 
 710         if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0)
 711                 libzfs_mnttab_update(hdl);
 712 
 713         find.mtn_mt.mnt_special = (char *)fsname;
 714         mtn = avl_find(&hdl->libzfs_mnttab_cache, &find, NULL);
 715         if (mtn) {
 716                 *entry = mtn->mtn_mt;
 717                 return (0);
 718         }
 719         return (ENOENT);
 720 }
 721 
 722 void
 723 libzfs_mnttab_add(libzfs_handle_t *hdl, const char *special,
 724     const char *mountp, const char *mntopts)
 725 {
 726         mnttab_node_t *mtn;
 727 
 728         if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0)
 729                 return;
 730         mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
 731         mtn->mtn_mt.mnt_special = zfs_strdup(hdl, special);
 732         mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, mountp);
 733         mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, MNTTYPE_ZFS);
 734         mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, mntopts);
 735         avl_add(&hdl->libzfs_mnttab_cache, mtn);
 736 }
 737 
 738 void
 739 libzfs_mnttab_remove(libzfs_handle_t *hdl, const char *fsname)
 740 {
 741         mnttab_node_t find;
 742         mnttab_node_t *ret;
 743 
 744         find.mtn_mt.mnt_special = (char *)fsname;
 745         if (ret = avl_find(&hdl->libzfs_mnttab_cache, (void *)&find, NULL)) {
 746                 avl_remove(&hdl->libzfs_mnttab_cache, ret);
 747                 free(ret->mtn_mt.mnt_special);
 748                 free(ret->mtn_mt.mnt_mountp);
 749                 free(ret->mtn_mt.mnt_fstype);
 750                 free(ret->mtn_mt.mnt_mntopts);
 751                 free(ret);
 752         }
 753 }
 754 
 755 int
 756 zfs_spa_version(zfs_handle_t *zhp, int *spa_version)
 757 {
 758         zpool_handle_t *zpool_handle = zhp->zpool_hdl;
 759 
 760         if (zpool_handle == NULL)
 761                 return (-1);
 762 
 763         *spa_version = zpool_get_prop_int(zpool_handle,
 764             ZPOOL_PROP_VERSION, NULL);
 765         return (0);
 766 }
 767 
 768 /*
 769  * The choice of reservation property depends on the SPA version.
 770  */
 771 static int
 772 zfs_which_resv_prop(zfs_handle_t *zhp, zfs_prop_t *resv_prop)
 773 {
 774         int spa_version;
 775 
 776         if (zfs_spa_version(zhp, &spa_version) < 0)
 777                 return (-1);
 778 
 779         if (spa_version >= SPA_VERSION_REFRESERVATION)
 780                 *resv_prop = ZFS_PROP_REFRESERVATION;
 781         else
 782                 *resv_prop = ZFS_PROP_RESERVATION;
 783 
 784         return (0);
 785 }
 786 
 787 /*
 788  * Given an nvlist of properties to set, validates that they are correct, and
 789  * parses any numeric properties (index, boolean, etc) if they are specified as
 790  * strings.
 791  */
 792 nvlist_t *
 793 zfs_valid_proplist(libzfs_handle_t *hdl, zfs_type_t type, nvlist_t *nvl,
 794     uint64_t zoned, zfs_handle_t *zhp, const char *errbuf)
 795 {
 796         nvpair_t *elem;
 797         uint64_t intval;
 798         char *strval;
 799         zfs_prop_t prop;
 800         nvlist_t *ret;
 801         int chosen_normal = -1;
 802         int chosen_utf = -1;
 803 
 804         if (nvlist_alloc(&ret, NV_UNIQUE_NAME, 0) != 0) {
 805                 (void) no_memory(hdl);
 806                 return (NULL);
 807         }
 808 
 809         /*
 810          * Make sure this property is valid and applies to this type.
 811          */
 812 
 813         elem = NULL;
 814         while ((elem = nvlist_next_nvpair(nvl, elem)) != NULL) {
 815                 const char *propname = nvpair_name(elem);
 816 
 817                 prop = zfs_name_to_prop(propname);
 818                 if (prop == ZPROP_INVAL && zfs_prop_user(propname)) {
 819                         /*
 820                          * This is a user property: make sure it's a
 821                          * string, and that it's less than ZAP_MAXNAMELEN.
 822                          */
 823                         if (nvpair_type(elem) != DATA_TYPE_STRING) {
 824                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 825                                     "'%s' must be a string"), propname);
 826                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 827                                 goto error;
 828                         }
 829 
 830                         if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
 831                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 832                                     "property name '%s' is too long"),
 833                                     propname);
 834                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 835                                 goto error;
 836                         }
 837 
 838                         (void) nvpair_value_string(elem, &strval);
 839                         if (nvlist_add_string(ret, propname, strval) != 0) {
 840                                 (void) no_memory(hdl);
 841                                 goto error;
 842                         }
 843                         continue;
 844                 }
 845 
 846                 /*
 847                  * Currently, only user properties can be modified on
 848                  * snapshots.
 849                  */
 850                 if (type == ZFS_TYPE_SNAPSHOT) {
 851                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 852                             "this property can not be modified for snapshots"));
 853                         (void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
 854                         goto error;
 855                 }
 856 
 857                 if (prop == ZPROP_INVAL && zfs_prop_userquota(propname)) {
 858                         zfs_userquota_prop_t uqtype;
 859                         char newpropname[128];
 860                         char domain[128];
 861                         uint64_t rid;
 862                         uint64_t valary[3];
 863 
 864                         if (userquota_propname_decode(propname, zoned,
 865                             &uqtype, domain, sizeof (domain), &rid) != 0) {
 866                                 zfs_error_aux(hdl,
 867                                     dgettext(TEXT_DOMAIN,
 868                                     "'%s' has an invalid user/group name"),
 869                                     propname);
 870                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 871                                 goto error;
 872                         }
 873 
 874                         if (uqtype != ZFS_PROP_USERQUOTA &&
 875                             uqtype != ZFS_PROP_GROUPQUOTA) {
 876                                 zfs_error_aux(hdl,
 877                                     dgettext(TEXT_DOMAIN, "'%s' is readonly"),
 878                                     propname);
 879                                 (void) zfs_error(hdl, EZFS_PROPREADONLY,
 880                                     errbuf);
 881                                 goto error;
 882                         }
 883 
 884                         if (nvpair_type(elem) == DATA_TYPE_STRING) {
 885                                 (void) nvpair_value_string(elem, &strval);
 886                                 if (strcmp(strval, "none") == 0) {
 887                                         intval = 0;
 888                                 } else if (zfs_nicestrtonum(hdl,
 889                                     strval, &intval) != 0) {
 890                                         (void) zfs_error(hdl,
 891                                             EZFS_BADPROP, errbuf);
 892                                         goto error;
 893                                 }
 894                         } else if (nvpair_type(elem) ==
 895                             DATA_TYPE_UINT64) {
 896                                 (void) nvpair_value_uint64(elem, &intval);
 897                                 if (intval == 0) {
 898                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 899                                             "use 'none' to disable "
 900                                             "userquota/groupquota"));
 901                                         goto error;
 902                                 }
 903                         } else {
 904                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 905                                     "'%s' must be a number"), propname);
 906                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 907                                 goto error;
 908                         }
 909 
 910                         /*
 911                          * Encode the prop name as
 912                          * userquota@<hex-rid>-domain, to make it easy
 913                          * for the kernel to decode.
 914                          */
 915                         (void) snprintf(newpropname, sizeof (newpropname),
 916                             "%s%llx-%s", zfs_userquota_prop_prefixes[uqtype],
 917                             (longlong_t)rid, domain);
 918                         valary[0] = uqtype;
 919                         valary[1] = rid;
 920                         valary[2] = intval;
 921                         if (nvlist_add_uint64_array(ret, newpropname,
 922                             valary, 3) != 0) {
 923                                 (void) no_memory(hdl);
 924                                 goto error;
 925                         }
 926                         continue;
 927                 } else if (prop == ZPROP_INVAL && zfs_prop_written(propname)) {
 928                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 929                             "'%s' is readonly"),
 930                             propname);
 931                         (void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
 932                         goto error;
 933                 }
 934 
 935                 if (prop == ZPROP_INVAL) {
 936                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 937                             "invalid property '%s'"), propname);
 938                         (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 939                         goto error;
 940                 }
 941 
 942                 if (!zfs_prop_valid_for_type(prop, type)) {
 943                         zfs_error_aux(hdl,
 944                             dgettext(TEXT_DOMAIN, "'%s' does not "
 945                             "apply to datasets of this type"), propname);
 946                         (void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
 947                         goto error;
 948                 }
 949 
 950                 if (zfs_prop_readonly(prop) &&
 951                     (!zfs_prop_setonce(prop) || zhp != NULL)) {
 952                         zfs_error_aux(hdl,
 953                             dgettext(TEXT_DOMAIN, "'%s' is readonly"),
 954                             propname);
 955                         (void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
 956                         goto error;
 957                 }
 958 
 959                 if (zprop_parse_value(hdl, elem, prop, type, ret,
 960                     &strval, &intval, errbuf) != 0)
 961                         goto error;
 962 
 963                 /*
 964                  * Perform some additional checks for specific properties.
 965                  */
 966                 switch (prop) {
 967                 case ZFS_PROP_VERSION:
 968                 {
 969                         int version;
 970 
 971                         if (zhp == NULL)
 972                                 break;
 973                         version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
 974                         if (intval < version) {
 975                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 976                                     "Can not downgrade; already at version %u"),
 977                                     version);
 978                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 979                                 goto error;
 980                         }
 981                         break;
 982                 }
 983 
 984                 case ZFS_PROP_RECORDSIZE:
 985                 case ZFS_PROP_VOLBLOCKSIZE:
 986                         /* must be power of two within SPA_{MIN,MAX}BLOCKSIZE */
 987                         if (intval < SPA_MINBLOCKSIZE ||
 988                             intval > SPA_MAXBLOCKSIZE || !ISP2(intval)) {
 989                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 990                                     "'%s' must be power of 2 from %u "
 991                                     "to %uk"), propname,
 992                                     (uint_t)SPA_MINBLOCKSIZE,
 993                                     (uint_t)SPA_MAXBLOCKSIZE >> 10);
 994                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 995                                 goto error;
 996                         }
 997                         break;
 998 
 999                 case ZFS_PROP_MLSLABEL:
1000                 {
1001                         /*
1002                          * Verify the mlslabel string and convert to
1003                          * internal hex label string.
1004                          */
1005 
1006                         m_label_t *new_sl;
1007                         char *hex = NULL;       /* internal label string */
1008 
1009                         /* Default value is already OK. */
1010                         if (strcasecmp(strval, ZFS_MLSLABEL_DEFAULT) == 0)
1011                                 break;
1012 
1013                         /* Verify the label can be converted to binary form */
1014                         if (((new_sl = m_label_alloc(MAC_LABEL)) == NULL) ||
1015                             (str_to_label(strval, &new_sl, MAC_LABEL,
1016                             L_NO_CORRECTION, NULL) == -1)) {
1017                                 goto badlabel;
1018                         }
1019 
1020                         /* Now translate to hex internal label string */
1021                         if (label_to_str(new_sl, &hex, M_INTERNAL,
1022                             DEF_NAMES) != 0) {
1023                                 if (hex)
1024                                         free(hex);
1025                                 goto badlabel;
1026                         }
1027                         m_label_free(new_sl);
1028 
1029                         /* If string is already in internal form, we're done. */
1030                         if (strcmp(strval, hex) == 0) {
1031                                 free(hex);
1032                                 break;
1033                         }
1034 
1035                         /* Replace the label string with the internal form. */
1036                         (void) nvlist_remove(ret, zfs_prop_to_name(prop),
1037                             DATA_TYPE_STRING);
1038                         verify(nvlist_add_string(ret, zfs_prop_to_name(prop),
1039                             hex) == 0);
1040                         free(hex);
1041 
1042                         break;
1043 
1044 badlabel:
1045                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1046                             "invalid mlslabel '%s'"), strval);
1047                         (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1048                         m_label_free(new_sl);   /* OK if null */
1049                         goto error;
1050 
1051                 }
1052 
1053                 case ZFS_PROP_MOUNTPOINT:
1054                 {
1055                         namecheck_err_t why;
1056 
1057                         if (strcmp(strval, ZFS_MOUNTPOINT_NONE) == 0 ||
1058                             strcmp(strval, ZFS_MOUNTPOINT_LEGACY) == 0)
1059                                 break;
1060 
1061                         if (mountpoint_namecheck(strval, &why)) {
1062                                 switch (why) {
1063                                 case NAME_ERR_LEADING_SLASH:
1064                                         zfs_error_aux(hdl,
1065                                             dgettext(TEXT_DOMAIN,
1066                                             "'%s' must be an absolute path, "
1067                                             "'none', or 'legacy'"), propname);
1068                                         break;
1069                                 case NAME_ERR_TOOLONG:
1070                                         zfs_error_aux(hdl,
1071                                             dgettext(TEXT_DOMAIN,
1072                                             "component of '%s' is too long"),
1073                                             propname);
1074                                         break;
1075                                 }
1076                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1077                                 goto error;
1078                         }
1079                 }
1080 
1081                         /*FALLTHRU*/
1082 
1083                 case ZFS_PROP_SHARESMB:
1084                 case ZFS_PROP_SHARENFS:
1085                         /*
1086                          * For the mountpoint and sharenfs or sharesmb
1087                          * properties, check if it can be set in a
1088                          * global/non-global zone based on
1089                          * the zoned property value:
1090                          *
1091                          *              global zone         non-global zone
1092                          * --------------------------------------------------
1093                          * zoned=on     mountpoint (no)     mountpoint (yes)
1094                          *              sharenfs (no)       sharenfs (no)
1095                          *              sharesmb (no)       sharesmb (no)
1096                          *
1097                          * zoned=off    mountpoint (yes)        N/A
1098                          *              sharenfs (yes)
1099                          *              sharesmb (yes)
1100                          */
1101                         if (zoned) {
1102                                 if (getzoneid() == GLOBAL_ZONEID) {
1103                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1104                                             "'%s' cannot be set on "
1105                                             "dataset in a non-global zone"),
1106                                             propname);
1107                                         (void) zfs_error(hdl, EZFS_ZONED,
1108                                             errbuf);
1109                                         goto error;
1110                                 } else if (prop == ZFS_PROP_SHARENFS ||
1111                                     prop == ZFS_PROP_SHARESMB) {
1112                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1113                                             "'%s' cannot be set in "
1114                                             "a non-global zone"), propname);
1115                                         (void) zfs_error(hdl, EZFS_ZONED,
1116                                             errbuf);
1117                                         goto error;
1118                                 }
1119                         } else if (getzoneid() != GLOBAL_ZONEID) {
1120                                 /*
1121                                  * If zoned property is 'off', this must be in
1122                                  * a global zone. If not, something is wrong.
1123                                  */
1124                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1125                                     "'%s' cannot be set while dataset "
1126                                     "'zoned' property is set"), propname);
1127                                 (void) zfs_error(hdl, EZFS_ZONED, errbuf);
1128                                 goto error;
1129                         }
1130 
1131                         /*
1132                          * At this point, it is legitimate to set the
1133                          * property. Now we want to make sure that the
1134                          * property value is valid if it is sharenfs.
1135                          */
1136                         if ((prop == ZFS_PROP_SHARENFS ||
1137                             prop == ZFS_PROP_SHARESMB) &&
1138                             strcmp(strval, "on") != 0 &&
1139                             strcmp(strval, "off") != 0) {
1140                                 zfs_share_proto_t proto;
1141 
1142                                 if (prop == ZFS_PROP_SHARESMB)
1143                                         proto = PROTO_SMB;
1144                                 else
1145                                         proto = PROTO_NFS;
1146 
1147                                 /*
1148                                  * Must be an valid sharing protocol
1149                                  * option string so init the libshare
1150                                  * in order to enable the parser and
1151                                  * then parse the options. We use the
1152                                  * control API since we don't care about
1153                                  * the current configuration and don't
1154                                  * want the overhead of loading it
1155                                  * until we actually do something.
1156                                  */
1157 
1158                                 if (zfs_init_libshare(hdl,
1159                                     SA_INIT_CONTROL_API) != SA_OK) {
1160                                         /*
1161                                          * An error occurred so we can't do
1162                                          * anything
1163                                          */
1164                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1165                                             "'%s' cannot be set: problem "
1166                                             "in share initialization"),
1167                                             propname);
1168                                         (void) zfs_error(hdl, EZFS_BADPROP,
1169                                             errbuf);
1170                                         goto error;
1171                                 }
1172 
1173                                 if (zfs_parse_options(strval, proto) != SA_OK) {
1174                                         /*
1175                                          * There was an error in parsing so
1176                                          * deal with it by issuing an error
1177                                          * message and leaving after
1178                                          * uninitializing the the libshare
1179                                          * interface.
1180                                          */
1181                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1182                                             "'%s' cannot be set to invalid "
1183                                             "options"), propname);
1184                                         (void) zfs_error(hdl, EZFS_BADPROP,
1185                                             errbuf);
1186                                         zfs_uninit_libshare(hdl);
1187                                         goto error;
1188                                 }
1189                                 zfs_uninit_libshare(hdl);
1190                         }
1191 
1192                         break;
1193                 case ZFS_PROP_UTF8ONLY:
1194                         chosen_utf = (int)intval;
1195                         break;
1196                 case ZFS_PROP_NORMALIZE:
1197                         chosen_normal = (int)intval;
1198                         break;
1199                 }
1200 
1201                 /*
1202                  * For changes to existing volumes, we have some additional
1203                  * checks to enforce.
1204                  */
1205                 if (type == ZFS_TYPE_VOLUME && zhp != NULL) {
1206                         uint64_t volsize = zfs_prop_get_int(zhp,
1207                             ZFS_PROP_VOLSIZE);
1208                         uint64_t blocksize = zfs_prop_get_int(zhp,
1209                             ZFS_PROP_VOLBLOCKSIZE);
1210                         char buf[64];
1211 
1212                         switch (prop) {
1213                         case ZFS_PROP_RESERVATION:
1214                         case ZFS_PROP_REFRESERVATION:
1215                                 if (intval > volsize) {
1216                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1217                                             "'%s' is greater than current "
1218                                             "volume size"), propname);
1219                                         (void) zfs_error(hdl, EZFS_BADPROP,
1220                                             errbuf);
1221                                         goto error;
1222                                 }
1223                                 break;
1224 
1225                         case ZFS_PROP_VOLSIZE:
1226                                 if (intval % blocksize != 0) {
1227                                         zfs_nicenum(blocksize, buf,
1228                                             sizeof (buf));
1229                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1230                                             "'%s' must be a multiple of "
1231                                             "volume block size (%s)"),
1232                                             propname, buf);
1233                                         (void) zfs_error(hdl, EZFS_BADPROP,
1234                                             errbuf);
1235                                         goto error;
1236                                 }
1237 
1238                                 if (intval == 0) {
1239                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1240                                             "'%s' cannot be zero"),
1241                                             propname);
1242                                         (void) zfs_error(hdl, EZFS_BADPROP,
1243                                             errbuf);
1244                                         goto error;
1245                                 }
1246                                 break;
1247                         }
1248                 }
1249         }
1250 
1251         /*
1252          * If normalization was chosen, but no UTF8 choice was made,
1253          * enforce rejection of non-UTF8 names.
1254          *
1255          * If normalization was chosen, but rejecting non-UTF8 names
1256          * was explicitly not chosen, it is an error.
1257          */
1258         if (chosen_normal > 0 && chosen_utf < 0) {
1259                 if (nvlist_add_uint64(ret,
1260                     zfs_prop_to_name(ZFS_PROP_UTF8ONLY), 1) != 0) {
1261                         (void) no_memory(hdl);
1262                         goto error;
1263                 }
1264         } else if (chosen_normal > 0 && chosen_utf == 0) {
1265                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1266                     "'%s' must be set 'on' if normalization chosen"),
1267                     zfs_prop_to_name(ZFS_PROP_UTF8ONLY));
1268                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1269                 goto error;
1270         }
1271         return (ret);
1272 
1273 error:
1274         nvlist_free(ret);
1275         return (NULL);
1276 }
1277 
1278 int
1279 zfs_add_synthetic_resv(zfs_handle_t *zhp, nvlist_t *nvl)
1280 {
1281         uint64_t old_volsize;
1282         uint64_t new_volsize;
1283         uint64_t old_reservation;
1284         uint64_t new_reservation;
1285         zfs_prop_t resv_prop;
1286 
1287         /*
1288          * If this is an existing volume, and someone is setting the volsize,
1289          * make sure that it matches the reservation, or add it if necessary.
1290          */
1291         old_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
1292         if (zfs_which_resv_prop(zhp, &resv_prop) < 0)
1293                 return (-1);
1294         old_reservation = zfs_prop_get_int(zhp, resv_prop);
1295         if ((zvol_volsize_to_reservation(old_volsize, zhp->zfs_props) !=
1296             old_reservation) || nvlist_lookup_uint64(nvl,
1297             zfs_prop_to_name(resv_prop), &new_reservation) != ENOENT) {
1298                 return (0);
1299         }
1300         if (nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_VOLSIZE),
1301             &new_volsize) != 0)
1302                 return (-1);
1303         new_reservation = zvol_volsize_to_reservation(new_volsize,
1304             zhp->zfs_props);
1305         if (nvlist_add_uint64(nvl, zfs_prop_to_name(resv_prop),
1306             new_reservation) != 0) {
1307                 (void) no_memory(zhp->zfs_hdl);
1308                 return (-1);
1309         }
1310         return (1);
1311 }
1312 
1313 void
1314 zfs_setprop_error(libzfs_handle_t *hdl, zfs_prop_t prop, int err,
1315     char *errbuf)
1316 {
1317         switch (err) {
1318 
1319         case ENOSPC:
1320                 /*
1321                  * For quotas and reservations, ENOSPC indicates
1322                  * something different; setting a quota or reservation
1323                  * doesn't use any disk space.
1324                  */
1325                 switch (prop) {
1326                 case ZFS_PROP_QUOTA:
1327                 case ZFS_PROP_REFQUOTA:
1328                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1329                             "size is less than current used or "
1330                             "reserved space"));
1331                         (void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
1332                         break;
1333 
1334                 case ZFS_PROP_RESERVATION:
1335                 case ZFS_PROP_REFRESERVATION:
1336                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1337                             "size is greater than available space"));
1338                         (void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
1339                         break;
1340 
1341                 default:
1342                         (void) zfs_standard_error(hdl, err, errbuf);
1343                         break;
1344                 }
1345                 break;
1346 
1347         case EBUSY:
1348                 (void) zfs_standard_error(hdl, EBUSY, errbuf);
1349                 break;
1350 
1351         case EROFS:
1352                 (void) zfs_error(hdl, EZFS_DSREADONLY, errbuf);
1353                 break;
1354 
1355         case ENOTSUP:
1356                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1357                     "pool and or dataset must be upgraded to set this "
1358                     "property or value"));
1359                 (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
1360                 break;
1361 
1362         case ERANGE:
1363                 if (prop == ZFS_PROP_COMPRESSION) {
1364                         (void) zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1365                             "property setting is not allowed on "
1366                             "bootable datasets"));
1367                         (void) zfs_error(hdl, EZFS_NOTSUP, errbuf);
1368                 } else {
1369                         (void) zfs_standard_error(hdl, err, errbuf);
1370                 }
1371                 break;
1372 
1373         case EINVAL:
1374                 if (prop == ZPROP_INVAL) {
1375                         (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1376                 } else {
1377                         (void) zfs_standard_error(hdl, err, errbuf);
1378                 }
1379                 break;
1380 
1381         case EOVERFLOW:
1382                 /*
1383                  * This platform can't address a volume this big.
1384                  */
1385 #ifdef _ILP32
1386                 if (prop == ZFS_PROP_VOLSIZE) {
1387                         (void) zfs_error(hdl, EZFS_VOLTOOBIG, errbuf);
1388                         break;
1389                 }
1390 #endif
1391                 /* FALLTHROUGH */
1392         default:
1393                 (void) zfs_standard_error(hdl, err, errbuf);
1394         }
1395 }
1396 
1397 /*
1398  * Given a property name and value, set the property for the given dataset.
1399  */
1400 int
1401 zfs_prop_set(zfs_handle_t *zhp, const char *propname, const char *propval)
1402 {
1403         zfs_cmd_t zc = { 0 };
1404         int ret = -1;
1405         prop_changelist_t *cl = NULL;
1406         char errbuf[1024];
1407         libzfs_handle_t *hdl = zhp->zfs_hdl;
1408         nvlist_t *nvl = NULL, *realprops;
1409         zfs_prop_t prop;
1410         boolean_t do_prefix;
1411         uint64_t idx;
1412         int added_resv;
1413 
1414         (void) snprintf(errbuf, sizeof (errbuf),
1415             dgettext(TEXT_DOMAIN, "cannot set property for '%s'"),
1416             zhp->zfs_name);
1417 
1418         if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0 ||
1419             nvlist_add_string(nvl, propname, propval) != 0) {
1420                 (void) no_memory(hdl);
1421                 goto error;
1422         }
1423 
1424         if ((realprops = zfs_valid_proplist(hdl, zhp->zfs_type, nvl,
1425             zfs_prop_get_int(zhp, ZFS_PROP_ZONED), zhp, errbuf)) == NULL)
1426                 goto error;
1427 
1428         nvlist_free(nvl);
1429         nvl = realprops;
1430 
1431         prop = zfs_name_to_prop(propname);
1432 
1433         if (prop == ZFS_PROP_VOLSIZE) {
1434                 if ((added_resv = zfs_add_synthetic_resv(zhp, nvl)) == -1)
1435                         goto error;
1436         }
1437 
1438         if ((cl = changelist_gather(zhp, prop, 0, 0)) == NULL)
1439                 goto error;
1440 
1441         if (prop == ZFS_PROP_MOUNTPOINT && changelist_haszonedchild(cl)) {
1442                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1443                     "child dataset with inherited mountpoint is used "
1444                     "in a non-global zone"));
1445                 ret = zfs_error(hdl, EZFS_ZONED, errbuf);
1446                 goto error;
1447         }
1448 
1449         /*
1450          * If the dataset's canmount property is being set to noauto,
1451          * or being set to on and the dataset is already mounted,
1452          * then we want to prevent unmounting & remounting it.
1453          */
1454         do_prefix = !((prop == ZFS_PROP_CANMOUNT) &&
1455             (zprop_string_to_index(prop, propval, &idx,
1456             ZFS_TYPE_DATASET) == 0) && (idx == ZFS_CANMOUNT_NOAUTO ||
1457             (idx == ZFS_CANMOUNT_ON && zfs_is_mounted(zhp, NULL))));
1458 
1459         if (do_prefix && (ret = changelist_prefix(cl)) != 0)
1460                 goto error;
1461 
1462         /*
1463          * Execute the corresponding ioctl() to set this property.
1464          */
1465         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1466 
1467         if (zcmd_write_src_nvlist(hdl, &zc, nvl) != 0)
1468                 goto error;
1469 
1470         ret = zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc);
1471 
1472         if (ret != 0) {
1473                 zfs_setprop_error(hdl, prop, errno, errbuf);
1474                 if (added_resv && errno == ENOSPC) {
1475                         /* clean up the volsize property we tried to set */
1476                         uint64_t old_volsize = zfs_prop_get_int(zhp,
1477                             ZFS_PROP_VOLSIZE);
1478                         nvlist_free(nvl);
1479                         zcmd_free_nvlists(&zc);
1480                         if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
1481                                 goto error;
1482                         if (nvlist_add_uint64(nvl,
1483                             zfs_prop_to_name(ZFS_PROP_VOLSIZE),
1484                             old_volsize) != 0)
1485                                 goto error;
1486                         if (zcmd_write_src_nvlist(hdl, &zc, nvl) != 0)
1487                                 goto error;
1488                         (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc);
1489                 }
1490         } else {
1491                 if (do_prefix)
1492                         ret = changelist_postfix(cl);
1493 
1494                 /*
1495                  * Refresh the statistics so the new property value
1496                  * is reflected.
1497                  */
1498                 if (ret == 0)
1499                         (void) get_stats(zhp);
1500         }
1501 
1502 error:
1503         nvlist_free(nvl);
1504         zcmd_free_nvlists(&zc);
1505         if (cl)
1506                 changelist_free(cl);
1507         return (ret);
1508 }
1509 
1510 /*
1511  * Given a property, inherit the value from the parent dataset, or if received
1512  * is TRUE, revert to the received value, if any.
1513  */
1514 int
1515 zfs_prop_inherit(zfs_handle_t *zhp, const char *propname, boolean_t received)
1516 {
1517         zfs_cmd_t zc = { 0 };
1518         int ret;
1519         prop_changelist_t *cl;
1520         libzfs_handle_t *hdl = zhp->zfs_hdl;
1521         char errbuf[1024];
1522         zfs_prop_t prop;
1523 
1524         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1525             "cannot inherit %s for '%s'"), propname, zhp->zfs_name);
1526 
1527         zc.zc_cookie = received;
1528         if ((prop = zfs_name_to_prop(propname)) == ZPROP_INVAL) {
1529                 /*
1530                  * For user properties, the amount of work we have to do is very
1531                  * small, so just do it here.
1532                  */
1533                 if (!zfs_prop_user(propname)) {
1534                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1535                             "invalid property"));
1536                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
1537                 }
1538 
1539                 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1540                 (void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));
1541 
1542                 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_INHERIT_PROP, &zc) != 0)
1543                         return (zfs_standard_error(hdl, errno, errbuf));
1544 
1545                 return (0);
1546         }
1547 
1548         /*
1549          * Verify that this property is inheritable.
1550          */
1551         if (zfs_prop_readonly(prop))
1552                 return (zfs_error(hdl, EZFS_PROPREADONLY, errbuf));
1553 
1554         if (!zfs_prop_inheritable(prop) && !received)
1555                 return (zfs_error(hdl, EZFS_PROPNONINHERIT, errbuf));
1556 
1557         /*
1558          * Check to see if the value applies to this type
1559          */
1560         if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
1561                 return (zfs_error(hdl, EZFS_PROPTYPE, errbuf));
1562 
1563         /*
1564          * Normalize the name, to get rid of shorthand abbreviations.
1565          */
1566         propname = zfs_prop_to_name(prop);
1567         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1568         (void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));
1569 
1570         if (prop == ZFS_PROP_MOUNTPOINT && getzoneid() == GLOBAL_ZONEID &&
1571             zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) {
1572                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1573                     "dataset is used in a non-global zone"));
1574                 return (zfs_error(hdl, EZFS_ZONED, errbuf));
1575         }
1576 
1577         /*
1578          * Determine datasets which will be affected by this change, if any.
1579          */
1580         if ((cl = changelist_gather(zhp, prop, 0, 0)) == NULL)
1581                 return (-1);
1582 
1583         if (prop == ZFS_PROP_MOUNTPOINT && changelist_haszonedchild(cl)) {
1584                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1585                     "child dataset with inherited mountpoint is used "
1586                     "in a non-global zone"));
1587                 ret = zfs_error(hdl, EZFS_ZONED, errbuf);
1588                 goto error;
1589         }
1590 
1591         if ((ret = changelist_prefix(cl)) != 0)
1592                 goto error;
1593 
1594         if ((ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_INHERIT_PROP, &zc)) != 0) {
1595                 return (zfs_standard_error(hdl, errno, errbuf));
1596         } else {
1597 
1598                 if ((ret = changelist_postfix(cl)) != 0)
1599                         goto error;
1600 
1601                 /*
1602                  * Refresh the statistics so the new property is reflected.
1603                  */
1604                 (void) get_stats(zhp);
1605         }
1606 
1607 error:
1608         changelist_free(cl);
1609         return (ret);
1610 }
1611 
1612 /*
1613  * True DSL properties are stored in an nvlist.  The following two functions
1614  * extract them appropriately.
1615  */
1616 static uint64_t
1617 getprop_uint64(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
1618 {
1619         nvlist_t *nv;
1620         uint64_t value;
1621 
1622         *source = NULL;
1623         if (nvlist_lookup_nvlist(zhp->zfs_props,
1624             zfs_prop_to_name(prop), &nv) == 0) {
1625                 verify(nvlist_lookup_uint64(nv, ZPROP_VALUE, &value) == 0);
1626                 (void) nvlist_lookup_string(nv, ZPROP_SOURCE, source);
1627         } else {
1628                 verify(!zhp->zfs_props_table ||
1629                     zhp->zfs_props_table[prop] == B_TRUE);
1630                 value = zfs_prop_default_numeric(prop);
1631                 *source = "";
1632         }
1633 
1634         return (value);
1635 }
1636 
1637 static char *
1638 getprop_string(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
1639 {
1640         nvlist_t *nv;
1641         char *value;
1642 
1643         *source = NULL;
1644         if (nvlist_lookup_nvlist(zhp->zfs_props,
1645             zfs_prop_to_name(prop), &nv) == 0) {
1646                 verify(nvlist_lookup_string(nv, ZPROP_VALUE, &value) == 0);
1647                 (void) nvlist_lookup_string(nv, ZPROP_SOURCE, source);
1648         } else {
1649                 verify(!zhp->zfs_props_table ||
1650                     zhp->zfs_props_table[prop] == B_TRUE);
1651                 if ((value = (char *)zfs_prop_default_string(prop)) == NULL)
1652                         value = "";
1653                 *source = "";
1654         }
1655 
1656         return (value);
1657 }
1658 
1659 static boolean_t
1660 zfs_is_recvd_props_mode(zfs_handle_t *zhp)
1661 {
1662         return (zhp->zfs_props == zhp->zfs_recvd_props);
1663 }
1664 
1665 static void
1666 zfs_set_recvd_props_mode(zfs_handle_t *zhp, uint64_t *cookie)
1667 {
1668         *cookie = (uint64_t)(uintptr_t)zhp->zfs_props;
1669         zhp->zfs_props = zhp->zfs_recvd_props;
1670 }
1671 
1672 static void
1673 zfs_unset_recvd_props_mode(zfs_handle_t *zhp, uint64_t *cookie)
1674 {
1675         zhp->zfs_props = (nvlist_t *)(uintptr_t)*cookie;
1676         *cookie = 0;
1677 }
1678 
1679 /*
1680  * Internal function for getting a numeric property.  Both zfs_prop_get() and
1681  * zfs_prop_get_int() are built using this interface.
1682  *
1683  * Certain properties can be overridden using 'mount -o'.  In this case, scan
1684  * the contents of the /etc/mnttab entry, searching for the appropriate options.
1685  * If they differ from the on-disk values, report the current values and mark
1686  * the source "temporary".
1687  */
1688 static int
1689 get_numeric_property(zfs_handle_t *zhp, zfs_prop_t prop, zprop_source_t *src,
1690     char **source, uint64_t *val)
1691 {
1692         zfs_cmd_t zc = { 0 };
1693         nvlist_t *zplprops = NULL;
1694         struct mnttab mnt;
1695         char *mntopt_on = NULL;
1696         char *mntopt_off = NULL;
1697         boolean_t received = zfs_is_recvd_props_mode(zhp);
1698 
1699         *source = NULL;
1700 
1701         switch (prop) {
1702         case ZFS_PROP_ATIME:
1703                 mntopt_on = MNTOPT_ATIME;
1704                 mntopt_off = MNTOPT_NOATIME;
1705                 break;
1706 
1707         case ZFS_PROP_DEVICES:
1708                 mntopt_on = MNTOPT_DEVICES;
1709                 mntopt_off = MNTOPT_NODEVICES;
1710                 break;
1711 
1712         case ZFS_PROP_EXEC:
1713                 mntopt_on = MNTOPT_EXEC;
1714                 mntopt_off = MNTOPT_NOEXEC;
1715                 break;
1716 
1717         case ZFS_PROP_READONLY:
1718                 mntopt_on = MNTOPT_RO;
1719                 mntopt_off = MNTOPT_RW;
1720                 break;
1721 
1722         case ZFS_PROP_SETUID:
1723                 mntopt_on = MNTOPT_SETUID;
1724                 mntopt_off = MNTOPT_NOSETUID;
1725                 break;
1726 
1727         case ZFS_PROP_XATTR:
1728                 mntopt_on = MNTOPT_XATTR;
1729                 mntopt_off = MNTOPT_NOXATTR;
1730                 break;
1731 
1732         case ZFS_PROP_NBMAND:
1733                 mntopt_on = MNTOPT_NBMAND;
1734                 mntopt_off = MNTOPT_NONBMAND;
1735                 break;
1736         }
1737 
1738         /*
1739          * Because looking up the mount options is potentially expensive
1740          * (iterating over all of /etc/mnttab), we defer its calculation until
1741          * we're looking up a property which requires its presence.
1742          */
1743         if (!zhp->zfs_mntcheck &&
1744             (mntopt_on != NULL || prop == ZFS_PROP_MOUNTED)) {
1745                 libzfs_handle_t *hdl = zhp->zfs_hdl;
1746                 struct mnttab entry;
1747 
1748                 if (libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0) {
1749                         zhp->zfs_mntopts = zfs_strdup(hdl,
1750                             entry.mnt_mntopts);
1751                         if (zhp->zfs_mntopts == NULL)
1752                                 return (-1);
1753                 }
1754 
1755                 zhp->zfs_mntcheck = B_TRUE;
1756         }
1757 
1758         if (zhp->zfs_mntopts == NULL)
1759                 mnt.mnt_mntopts = "";
1760         else
1761                 mnt.mnt_mntopts = zhp->zfs_mntopts;
1762 
1763         switch (prop) {
1764         case ZFS_PROP_ATIME:
1765         case ZFS_PROP_DEVICES:
1766         case ZFS_PROP_EXEC:
1767         case ZFS_PROP_READONLY:
1768         case ZFS_PROP_SETUID:
1769         case ZFS_PROP_XATTR:
1770         case ZFS_PROP_NBMAND:
1771                 *val = getprop_uint64(zhp, prop, source);
1772 
1773                 if (received)
1774                         break;
1775 
1776                 if (hasmntopt(&mnt, mntopt_on) && !*val) {
1777                         *val = B_TRUE;
1778                         if (src)
1779                                 *src = ZPROP_SRC_TEMPORARY;
1780                 } else if (hasmntopt(&mnt, mntopt_off) && *val) {
1781                         *val = B_FALSE;
1782                         if (src)
1783                                 *src = ZPROP_SRC_TEMPORARY;
1784                 }
1785                 break;
1786 
1787         case ZFS_PROP_CANMOUNT:
1788         case ZFS_PROP_VOLSIZE:
1789         case ZFS_PROP_QUOTA:
1790         case ZFS_PROP_REFQUOTA:
1791         case ZFS_PROP_RESERVATION:
1792         case ZFS_PROP_REFRESERVATION:
1793                 *val = getprop_uint64(zhp, prop, source);
1794 
1795                 if (*source == NULL) {
1796                         /* not default, must be local */
1797                         *source = zhp->zfs_name;
1798                 }
1799                 break;
1800 
1801         case ZFS_PROP_MOUNTED:
1802                 *val = (zhp->zfs_mntopts != NULL);
1803                 break;
1804 
1805         case ZFS_PROP_NUMCLONES:
1806                 *val = zhp->zfs_dmustats.dds_num_clones;
1807                 break;
1808 
1809         case ZFS_PROP_VERSION:
1810         case ZFS_PROP_NORMALIZE:
1811         case ZFS_PROP_UTF8ONLY:
1812         case ZFS_PROP_CASE:
1813                 if (!zfs_prop_valid_for_type(prop, zhp->zfs_head_type) ||
1814                     zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
1815                         return (-1);
1816                 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1817                 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_OBJSET_ZPLPROPS, &zc)) {
1818                         zcmd_free_nvlists(&zc);
1819                         return (-1);
1820                 }
1821                 if (zcmd_read_dst_nvlist(zhp->zfs_hdl, &zc, &zplprops) != 0 ||
1822                     nvlist_lookup_uint64(zplprops, zfs_prop_to_name(prop),
1823                     val) != 0) {
1824                         zcmd_free_nvlists(&zc);
1825                         return (-1);
1826                 }
1827                 if (zplprops)
1828                         nvlist_free(zplprops);
1829                 zcmd_free_nvlists(&zc);
1830                 break;
1831 
1832         default:
1833                 switch (zfs_prop_get_type(prop)) {
1834                 case PROP_TYPE_NUMBER:
1835                 case PROP_TYPE_INDEX:
1836                         *val = getprop_uint64(zhp, prop, source);
1837                         /*
1838                          * If we tried to use a default value for a
1839                          * readonly property, it means that it was not
1840                          * present.
1841                          */
1842                         if (zfs_prop_readonly(prop) &&
1843                             *source != NULL && (*source)[0] == '\0') {
1844                                 *source = NULL;
1845                         }
1846                         break;
1847 
1848                 case PROP_TYPE_STRING:
1849                 default:
1850                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
1851                             "cannot get non-numeric property"));
1852                         return (zfs_error(zhp->zfs_hdl, EZFS_BADPROP,
1853                             dgettext(TEXT_DOMAIN, "internal error")));
1854                 }
1855         }
1856 
1857         return (0);
1858 }
1859 
1860 /*
1861  * Calculate the source type, given the raw source string.
1862  */
1863 static void
1864 get_source(zfs_handle_t *zhp, zprop_source_t *srctype, char *source,
1865     char *statbuf, size_t statlen)
1866 {
1867         if (statbuf == NULL || *srctype == ZPROP_SRC_TEMPORARY)
1868                 return;
1869 
1870         if (source == NULL) {
1871                 *srctype = ZPROP_SRC_NONE;
1872         } else if (source[0] == '\0') {
1873                 *srctype = ZPROP_SRC_DEFAULT;
1874         } else if (strstr(source, ZPROP_SOURCE_VAL_RECVD) != NULL) {
1875                 *srctype = ZPROP_SRC_RECEIVED;
1876         } else {
1877                 if (strcmp(source, zhp->zfs_name) == 0) {
1878                         *srctype = ZPROP_SRC_LOCAL;
1879                 } else {
1880                         (void) strlcpy(statbuf, source, statlen);
1881                         *srctype = ZPROP_SRC_INHERITED;
1882                 }
1883         }
1884 
1885 }
1886 
1887 int
1888 zfs_prop_get_recvd(zfs_handle_t *zhp, const char *propname, char *propbuf,
1889     size_t proplen, boolean_t literal)
1890 {
1891         zfs_prop_t prop;
1892         int err = 0;
1893 
1894         if (zhp->zfs_recvd_props == NULL)
1895                 if (get_recvd_props_ioctl(zhp) != 0)
1896                         return (-1);
1897 
1898         prop = zfs_name_to_prop(propname);
1899 
1900         if (prop != ZPROP_INVAL) {
1901                 uint64_t cookie;
1902                 if (!nvlist_exists(zhp->zfs_recvd_props, propname))
1903                         return (-1);
1904                 zfs_set_recvd_props_mode(zhp, &cookie);
1905                 err = zfs_prop_get(zhp, prop, propbuf, proplen,
1906                     NULL, NULL, 0, literal);
1907                 zfs_unset_recvd_props_mode(zhp, &cookie);
1908         } else {
1909                 nvlist_t *propval;
1910                 char *recvdval;
1911                 if (nvlist_lookup_nvlist(zhp->zfs_recvd_props,
1912                     propname, &propval) != 0)
1913                         return (-1);
1914                 verify(nvlist_lookup_string(propval, ZPROP_VALUE,
1915                     &recvdval) == 0);
1916                 (void) strlcpy(propbuf, recvdval, proplen);
1917         }
1918 
1919         return (err == 0 ? 0 : -1);
1920 }
1921 
1922 static int
1923 get_clones_string(zfs_handle_t *zhp, char *propbuf, size_t proplen)
1924 {
1925         nvlist_t *value;
1926         nvpair_t *pair;
1927 
1928         value = zfs_get_clones_nvl(zhp);
1929         if (value == NULL)
1930                 return (-1);
1931 
1932         propbuf[0] = '\0';
1933         for (pair = nvlist_next_nvpair(value, NULL); pair != NULL;
1934             pair = nvlist_next_nvpair(value, pair)) {
1935                 if (propbuf[0] != '\0')
1936                         (void) strlcat(propbuf, ",", proplen);
1937                 (void) strlcat(propbuf, nvpair_name(pair), proplen);
1938         }
1939 
1940         return (0);
1941 }
1942 
1943 struct get_clones_arg {
1944         uint64_t numclones;
1945         nvlist_t *value;
1946         const char *origin;
1947         char buf[ZFS_MAXNAMELEN];
1948 };
1949 
1950 int
1951 get_clones_cb(zfs_handle_t *zhp, void *arg)
1952 {
1953         struct get_clones_arg *gca = arg;
1954 
1955         if (gca->numclones == 0) {
1956                 zfs_close(zhp);
1957                 return (0);
1958         }
1959 
1960         if (zfs_prop_get(zhp, ZFS_PROP_ORIGIN, gca->buf, sizeof (gca->buf),
1961             NULL, NULL, 0, B_TRUE) != 0)
1962                 goto out;
1963         if (strcmp(gca->buf, gca->origin) == 0) {
1964                 if (nvlist_add_boolean(gca->value, zfs_get_name(zhp)) != 0) {
1965                         zfs_close(zhp);
1966                         return (no_memory(zhp->zfs_hdl));
1967                 }
1968                 gca->numclones--;
1969         }
1970 
1971 out:
1972         (void) zfs_iter_children(zhp, get_clones_cb, gca);
1973         zfs_close(zhp);
1974         return (0);
1975 }
1976 
1977 nvlist_t *
1978 zfs_get_clones_nvl(zfs_handle_t *zhp)
1979 {
1980         nvlist_t *nv, *value;
1981 
1982         if (nvlist_lookup_nvlist(zhp->zfs_props,
1983             zfs_prop_to_name(ZFS_PROP_CLONES), &nv) != 0) {
1984                 struct get_clones_arg gca;
1985 
1986                 /*
1987                  * if this is a snapshot, then the kernel wasn't able
1988                  * to get the clones.  Do it by slowly iterating.
1989                  */
1990                 if (zhp->zfs_type != ZFS_TYPE_SNAPSHOT)
1991                         return (NULL);
1992                 if (nvlist_alloc(&nv, NV_UNIQUE_NAME, 0) != 0)
1993                         return (NULL);
1994                 if (nvlist_alloc(&value, NV_UNIQUE_NAME, 0) != 0) {
1995                         nvlist_free(nv);
1996                         return (NULL);
1997                 }
1998 
1999                 gca.numclones = zfs_prop_get_int(zhp, ZFS_PROP_NUMCLONES);
2000                 gca.value = value;
2001                 gca.origin = zhp->zfs_name;
2002 
2003                 if (gca.numclones != 0) {
2004                         zfs_handle_t *root;
2005                         char pool[ZFS_MAXNAMELEN];
2006                         char *cp = pool;
2007 
2008                         /* get the pool name */
2009                         (void) strlcpy(pool, zhp->zfs_name, sizeof (pool));
2010                         (void) strsep(&cp, "/@");
2011                         root = zfs_open(zhp->zfs_hdl, pool,
2012                             ZFS_TYPE_FILESYSTEM);
2013 
2014                         (void) get_clones_cb(root, &gca);
2015                 }
2016 
2017                 if (gca.numclones != 0 ||
2018                     nvlist_add_nvlist(nv, ZPROP_VALUE, value) != 0 ||
2019                     nvlist_add_nvlist(zhp->zfs_props,
2020                     zfs_prop_to_name(ZFS_PROP_CLONES), nv) != 0) {
2021                         nvlist_free(nv);
2022                         nvlist_free(value);
2023                         return (NULL);
2024                 }
2025                 nvlist_free(nv);
2026                 nvlist_free(value);
2027                 verify(0 == nvlist_lookup_nvlist(zhp->zfs_props,
2028                     zfs_prop_to_name(ZFS_PROP_CLONES), &nv));
2029         }
2030 
2031         verify(nvlist_lookup_nvlist(nv, ZPROP_VALUE, &value) == 0);
2032 
2033         return (value);
2034 }
2035 
2036 /*
2037  * Retrieve a property from the given object.  If 'literal' is specified, then
2038  * numbers are left as exact values.  Otherwise, numbers are converted to a
2039  * human-readable form.
2040  *
2041  * Returns 0 on success, or -1 on error.
2042  */
2043 int
2044 zfs_prop_get(zfs_handle_t *zhp, zfs_prop_t prop, char *propbuf, size_t proplen,
2045     zprop_source_t *src, char *statbuf, size_t statlen, boolean_t literal)
2046 {
2047         char *source = NULL;
2048         uint64_t val;
2049         char *str;
2050         const char *strval;
2051         boolean_t received = zfs_is_recvd_props_mode(zhp);
2052 
2053         /*
2054          * Check to see if this property applies to our object
2055          */
2056         if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
2057                 return (-1);
2058 
2059         if (received && zfs_prop_readonly(prop))
2060                 return (-1);
2061 
2062         if (src)
2063                 *src = ZPROP_SRC_NONE;
2064 
2065         switch (prop) {
2066         case ZFS_PROP_CREATION:
2067                 /*
2068                  * 'creation' is a time_t stored in the statistics.  We convert
2069                  * this into a string unless 'literal' is specified.
2070                  */
2071                 {
2072                         val = getprop_uint64(zhp, prop, &source);
2073                         time_t time = (time_t)val;
2074                         struct tm t;
2075 
2076                         if (literal ||
2077                             localtime_r(&time, &t) == NULL ||
2078                             strftime(propbuf, proplen, "%a %b %e %k:%M %Y",
2079                             &t) == 0)
2080                                 (void) snprintf(propbuf, proplen, "%llu", val);
2081                 }
2082                 break;
2083 
2084         case ZFS_PROP_MOUNTPOINT:
2085                 /*
2086                  * Getting the precise mountpoint can be tricky.
2087                  *
2088                  *  - for 'none' or 'legacy', return those values.
2089                  *  - for inherited mountpoints, we want to take everything
2090                  *    after our ancestor and append it to the inherited value.
2091                  *
2092                  * If the pool has an alternate root, we want to prepend that
2093                  * root to any values we return.
2094                  */
2095 
2096                 str = getprop_string(zhp, prop, &source);
2097 
2098                 if (str[0] == '/') {
2099                         char buf[MAXPATHLEN];
2100                         char *root = buf;
2101                         const char *relpath;
2102 
2103                         /*
2104                          * If we inherit the mountpoint, even from a dataset
2105                          * with a received value, the source will be the path of
2106                          * the dataset we inherit from. If source is
2107                          * ZPROP_SOURCE_VAL_RECVD, the received value is not
2108                          * inherited.
2109                          */
2110                         if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) {
2111                                 relpath = "";
2112                         } else {
2113                                 relpath = zhp->zfs_name + strlen(source);
2114                                 if (relpath[0] == '/')
2115                                         relpath++;
2116                         }
2117 
2118                         if ((zpool_get_prop(zhp->zpool_hdl,
2119                             ZPOOL_PROP_ALTROOT, buf, MAXPATHLEN, NULL)) ||
2120                             (strcmp(root, "-") == 0))
2121                                 root[0] = '\0';
2122                         /*
2123                          * Special case an alternate root of '/'. This will
2124                          * avoid having multiple leading slashes in the
2125                          * mountpoint path.
2126                          */
2127                         if (strcmp(root, "/") == 0)
2128                                 root++;
2129 
2130                         /*
2131                          * If the mountpoint is '/' then skip over this
2132                          * if we are obtaining either an alternate root or
2133                          * an inherited mountpoint.
2134                          */
2135                         if (str[1] == '\0' && (root[0] != '\0' ||
2136                             relpath[0] != '\0'))
2137                                 str++;
2138 
2139                         if (relpath[0] == '\0')
2140                                 (void) snprintf(propbuf, proplen, "%s%s",
2141                                     root, str);
2142                         else
2143                                 (void) snprintf(propbuf, proplen, "%s%s%s%s",
2144                                     root, str, relpath[0] == '@' ? "" : "/",
2145                                     relpath);
2146                 } else {
2147                         /* 'legacy' or 'none' */
2148                         (void) strlcpy(propbuf, str, proplen);
2149                 }
2150 
2151                 break;
2152 
2153         case ZFS_PROP_ORIGIN:
2154                 (void) strlcpy(propbuf, getprop_string(zhp, prop, &source),
2155                     proplen);
2156                 /*
2157                  * If there is no parent at all, return failure to indicate that
2158                  * it doesn't apply to this dataset.
2159                  */
2160                 if (propbuf[0] == '\0')
2161                         return (-1);
2162                 break;
2163 
2164         case ZFS_PROP_CLONES:
2165                 if (get_clones_string(zhp, propbuf, proplen) != 0)
2166                         return (-1);
2167                 break;
2168 
2169         case ZFS_PROP_QUOTA:
2170         case ZFS_PROP_REFQUOTA:
2171         case ZFS_PROP_RESERVATION:
2172         case ZFS_PROP_REFRESERVATION:
2173 
2174                 if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
2175                         return (-1);
2176 
2177                 /*
2178                  * If quota or reservation is 0, we translate this into 'none'
2179                  * (unless literal is set), and indicate that it's the default
2180                  * value.  Otherwise, we print the number nicely and indicate
2181                  * that its set locally.
2182                  */
2183                 if (val == 0) {
2184                         if (literal)
2185                                 (void) strlcpy(propbuf, "0", proplen);
2186                         else
2187                                 (void) strlcpy(propbuf, "none", proplen);
2188                 } else {
2189                         if (literal)
2190                                 (void) snprintf(propbuf, proplen, "%llu",
2191                                     (u_longlong_t)val);
2192                         else
2193                                 zfs_nicenum(val, propbuf, proplen);
2194                 }
2195                 break;
2196 
2197         case ZFS_PROP_REFRATIO:
2198         case ZFS_PROP_COMPRESSRATIO:
2199                 if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
2200                         return (-1);
2201                 (void) snprintf(propbuf, proplen, "%llu.%02llux",
2202                     (u_longlong_t)(val / 100),
2203                     (u_longlong_t)(val % 100));
2204                 break;
2205 
2206         case ZFS_PROP_TYPE:
2207                 switch (zhp->zfs_type) {
2208                 case ZFS_TYPE_FILESYSTEM:
2209                         str = "filesystem";
2210                         break;
2211                 case ZFS_TYPE_VOLUME:
2212                         str = "volume";
2213                         break;
2214                 case ZFS_TYPE_SNAPSHOT:
2215                         str = "snapshot";
2216                         break;
2217                 default:
2218                         abort();
2219                 }
2220                 (void) snprintf(propbuf, proplen, "%s", str);
2221                 break;
2222 
2223         case ZFS_PROP_MOUNTED:
2224                 /*
2225                  * The 'mounted' property is a pseudo-property that described
2226                  * whether the filesystem is currently mounted.  Even though
2227                  * it's a boolean value, the typical values of "on" and "off"
2228                  * don't make sense, so we translate to "yes" and "no".
2229                  */
2230                 if (get_numeric_property(zhp, ZFS_PROP_MOUNTED,
2231                     src, &source, &val) != 0)
2232                         return (-1);
2233                 if (val)
2234                         (void) strlcpy(propbuf, "yes", proplen);
2235                 else
2236                         (void) strlcpy(propbuf, "no", proplen);
2237                 break;
2238 
2239         case ZFS_PROP_NAME:
2240                 /*
2241                  * The 'name' property is a pseudo-property derived from the
2242                  * dataset name.  It is presented as a real property to simplify
2243                  * consumers.
2244                  */
2245                 (void) strlcpy(propbuf, zhp->zfs_name, proplen);
2246                 break;
2247 
2248         case ZFS_PROP_MLSLABEL:
2249                 {
2250                         m_label_t *new_sl = NULL;
2251                         char *ascii = NULL;     /* human readable label */
2252 
2253                         (void) strlcpy(propbuf,
2254                             getprop_string(zhp, prop, &source), proplen);
2255 
2256                         if (literal || (strcasecmp(propbuf,
2257                             ZFS_MLSLABEL_DEFAULT) == 0))
2258                                 break;
2259 
2260                         /*
2261                          * Try to translate the internal hex string to
2262                          * human-readable output.  If there are any
2263                          * problems just use the hex string.
2264                          */
2265 
2266                         if (str_to_label(propbuf, &new_sl, MAC_LABEL,
2267                             L_NO_CORRECTION, NULL) == -1) {
2268                                 m_label_free(new_sl);
2269                                 break;
2270                         }
2271 
2272                         if (label_to_str(new_sl, &ascii, M_LABEL,
2273                             DEF_NAMES) != 0) {
2274                                 if (ascii)
2275                                         free(ascii);
2276                                 m_label_free(new_sl);
2277                                 break;
2278                         }
2279                         m_label_free(new_sl);
2280 
2281                         (void) strlcpy(propbuf, ascii, proplen);
2282                         free(ascii);
2283                 }
2284                 break;
2285 
2286         case ZFS_PROP_GUID:
2287                 /*
2288                  * GUIDs are stored as numbers, but they are identifiers.
2289                  * We don't want them to be pretty printed, because pretty
2290                  * printing mangles the ID into a truncated and useless value.
2291                  */
2292                 if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
2293                         return (-1);
2294                 (void) snprintf(propbuf, proplen, "%llu", (u_longlong_t)val);
2295                 break;
2296 
2297         default:
2298                 switch (zfs_prop_get_type(prop)) {
2299                 case PROP_TYPE_NUMBER:
2300                         if (get_numeric_property(zhp, prop, src,
2301                             &source, &val) != 0)
2302                                 return (-1);
2303                         if (literal)
2304                                 (void) snprintf(propbuf, proplen, "%llu",
2305                                     (u_longlong_t)val);
2306                         else
2307                                 zfs_nicenum(val, propbuf, proplen);
2308                         break;
2309 
2310                 case PROP_TYPE_STRING:
2311                         (void) strlcpy(propbuf,
2312                             getprop_string(zhp, prop, &source), proplen);
2313                         break;
2314 
2315                 case PROP_TYPE_INDEX:
2316                         if (get_numeric_property(zhp, prop, src,
2317                             &source, &val) != 0)
2318                                 return (-1);
2319                         if (zfs_prop_index_to_string(prop, val, &strval) != 0)
2320                                 return (-1);
2321                         (void) strlcpy(propbuf, strval, proplen);
2322                         break;
2323 
2324                 default:
2325                         abort();
2326                 }
2327         }
2328 
2329         get_source(zhp, src, source, statbuf, statlen);
2330 
2331         return (0);
2332 }
2333 
2334 /*
2335  * Utility function to get the given numeric property.  Does no validation that
2336  * the given property is the appropriate type; should only be used with
2337  * hard-coded property types.
2338  */
2339 uint64_t
2340 zfs_prop_get_int(zfs_handle_t *zhp, zfs_prop_t prop)
2341 {
2342         char *source;
2343         uint64_t val;
2344 
2345         (void) get_numeric_property(zhp, prop, NULL, &source, &val);
2346 
2347         return (val);
2348 }
2349 
2350 int
2351 zfs_prop_set_int(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t val)
2352 {
2353         char buf[64];
2354 
2355         (void) snprintf(buf, sizeof (buf), "%llu", (longlong_t)val);
2356         return (zfs_prop_set(zhp, zfs_prop_to_name(prop), buf));
2357 }
2358 
2359 /*
2360  * Similar to zfs_prop_get(), but returns the value as an integer.
2361  */
2362 int
2363 zfs_prop_get_numeric(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t *value,
2364     zprop_source_t *src, char *statbuf, size_t statlen)
2365 {
2366         char *source;
2367 
2368         /*
2369          * Check to see if this property applies to our object
2370          */
2371         if (!zfs_prop_valid_for_type(prop, zhp->zfs_type)) {
2372                 return (zfs_error_fmt(zhp->zfs_hdl, EZFS_PROPTYPE,
2373                     dgettext(TEXT_DOMAIN, "cannot get property '%s'"),
2374                     zfs_prop_to_name(prop)));
2375         }
2376 
2377         if (src)
2378                 *src = ZPROP_SRC_NONE;
2379 
2380         if (get_numeric_property(zhp, prop, src, &source, value) != 0)
2381                 return (-1);
2382 
2383         get_source(zhp, src, source, statbuf, statlen);
2384 
2385         return (0);
2386 }
2387 
2388 static int
2389 idmap_id_to_numeric_domain_rid(uid_t id, boolean_t isuser,
2390     char **domainp, idmap_rid_t *ridp)
2391 {
2392         idmap_get_handle_t *get_hdl = NULL;
2393         idmap_stat status;
2394         int err = EINVAL;
2395 
2396         if (idmap_get_create(&get_hdl) != IDMAP_SUCCESS)
2397                 goto out;
2398 
2399         if (isuser) {
2400                 err = idmap_get_sidbyuid(get_hdl, id,
2401                     IDMAP_REQ_FLG_USE_CACHE, domainp, ridp, &status);
2402         } else {
2403                 err = idmap_get_sidbygid(get_hdl, id,
2404                     IDMAP_REQ_FLG_USE_CACHE, domainp, ridp, &status);
2405         }
2406         if (err == IDMAP_SUCCESS &&
2407             idmap_get_mappings(get_hdl) == IDMAP_SUCCESS &&
2408             status == IDMAP_SUCCESS)
2409                 err = 0;
2410         else
2411                 err = EINVAL;
2412 out:
2413         if (get_hdl)
2414                 idmap_get_destroy(get_hdl);
2415         return (err);
2416 }
2417 
2418 /*
2419  * convert the propname into parameters needed by kernel
2420  * Eg: userquota@ahrens -> ZFS_PROP_USERQUOTA, "", 126829
2421  * Eg: userused@matt@domain -> ZFS_PROP_USERUSED, "S-1-123-456", 789
2422  */
2423 static int
2424 userquota_propname_decode(const char *propname, boolean_t zoned,
2425     zfs_userquota_prop_t *typep, char *domain, int domainlen, uint64_t *ridp)
2426 {
2427         zfs_userquota_prop_t type;
2428         char *cp, *end;
2429         char *numericsid = NULL;
2430         boolean_t isuser;
2431 
2432         domain[0] = '\0';
2433 
2434         /* Figure out the property type ({user|group}{quota|space}) */
2435         for (type = 0; type < ZFS_NUM_USERQUOTA_PROPS; type++) {
2436                 if (strncmp(propname, zfs_userquota_prop_prefixes[type],
2437                     strlen(zfs_userquota_prop_prefixes[type])) == 0)
2438                         break;
2439         }
2440         if (type == ZFS_NUM_USERQUOTA_PROPS)
2441                 return (EINVAL);
2442         *typep = type;
2443 
2444         isuser = (type == ZFS_PROP_USERQUOTA ||
2445             type == ZFS_PROP_USERUSED);
2446 
2447         cp = strchr(propname, '@') + 1;
2448 
2449         if (strchr(cp, '@')) {
2450                 /*
2451                  * It's a SID name (eg "user@domain") that needs to be
2452                  * turned into S-1-domainID-RID.
2453                  */
2454                 directory_error_t e;
2455                 if (zoned && getzoneid() == GLOBAL_ZONEID)
2456                         return (ENOENT);
2457                 if (isuser) {
2458                         e = directory_sid_from_user_name(NULL,
2459                             cp, &numericsid);
2460                 } else {
2461                         e = directory_sid_from_group_name(NULL,
2462                             cp, &numericsid);
2463                 }
2464                 if (e != NULL) {
2465                         directory_error_free(e);
2466                         return (ENOENT);
2467                 }
2468                 if (numericsid == NULL)
2469                         return (ENOENT);
2470                 cp = numericsid;
2471                 /* will be further decoded below */
2472         }
2473 
2474         if (strncmp(cp, "S-1-", 4) == 0) {
2475                 /* It's a numeric SID (eg "S-1-234-567-89") */
2476                 (void) strlcpy(domain, cp, domainlen);
2477                 cp = strrchr(domain, '-');
2478                 *cp = '\0';
2479                 cp++;
2480 
2481                 errno = 0;
2482                 *ridp = strtoull(cp, &end, 10);
2483                 if (numericsid) {
2484                         free(numericsid);
2485                         numericsid = NULL;
2486                 }
2487                 if (errno != 0 || *end != '\0')
2488                         return (EINVAL);
2489         } else if (!isdigit(*cp)) {
2490                 /*
2491                  * It's a user/group name (eg "user") that needs to be
2492                  * turned into a uid/gid
2493                  */
2494                 if (zoned && getzoneid() == GLOBAL_ZONEID)
2495                         return (ENOENT);
2496                 if (isuser) {
2497                         struct passwd *pw;
2498                         pw = getpwnam(cp);
2499                         if (pw == NULL)
2500                                 return (ENOENT);
2501                         *ridp = pw->pw_uid;
2502                 } else {
2503                         struct group *gr;
2504                         gr = getgrnam(cp);
2505                         if (gr == NULL)
2506                                 return (ENOENT);
2507                         *ridp = gr->gr_gid;
2508                 }
2509         } else {
2510                 /* It's a user/group ID (eg "12345"). */
2511                 uid_t id = strtoul(cp, &end, 10);
2512                 idmap_rid_t rid;
2513                 char *mapdomain;
2514 
2515                 if (*end != '\0')
2516                         return (EINVAL);
2517                 if (id > MAXUID) {
2518                         /* It's an ephemeral ID. */
2519                         if (idmap_id_to_numeric_domain_rid(id, isuser,
2520                             &mapdomain, &rid) != 0)
2521                                 return (ENOENT);
2522                         (void) strlcpy(domain, mapdomain, domainlen);
2523                         *ridp = rid;
2524                 } else {
2525                         *ridp = id;
2526                 }
2527         }
2528 
2529         ASSERT3P(numericsid, ==, NULL);
2530         return (0);
2531 }
2532 
2533 static int
2534 zfs_prop_get_userquota_common(zfs_handle_t *zhp, const char *propname,
2535     uint64_t *propvalue, zfs_userquota_prop_t *typep)
2536 {
2537         int err;
2538         zfs_cmd_t zc = { 0 };
2539 
2540         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
2541 
2542         err = userquota_propname_decode(propname,
2543             zfs_prop_get_int(zhp, ZFS_PROP_ZONED),
2544             typep, zc.zc_value, sizeof (zc.zc_value), &zc.zc_guid);
2545         zc.zc_objset_type = *typep;
2546         if (err)
2547                 return (err);
2548 
2549         err = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_USERSPACE_ONE, &zc);
2550         if (err)
2551                 return (err);
2552 
2553         *propvalue = zc.zc_cookie;
2554         return (0);
2555 }
2556 
2557 int
2558 zfs_prop_get_userquota_int(zfs_handle_t *zhp, const char *propname,
2559     uint64_t *propvalue)
2560 {
2561         zfs_userquota_prop_t type;
2562 
2563         return (zfs_prop_get_userquota_common(zhp, propname, propvalue,
2564             &type));
2565 }
2566 
2567 int
2568 zfs_prop_get_userquota(zfs_handle_t *zhp, const char *propname,
2569     char *propbuf, int proplen, boolean_t literal)
2570 {
2571         int err;
2572         uint64_t propvalue;
2573         zfs_userquota_prop_t type;
2574 
2575         err = zfs_prop_get_userquota_common(zhp, propname, &propvalue,
2576             &type);
2577 
2578         if (err)
2579                 return (err);
2580 
2581         if (literal) {
2582                 (void) snprintf(propbuf, proplen, "%llu", propvalue);
2583         } else if (propvalue == 0 &&
2584             (type == ZFS_PROP_USERQUOTA || type == ZFS_PROP_GROUPQUOTA)) {
2585                 (void) strlcpy(propbuf, "none", proplen);
2586         } else {
2587                 zfs_nicenum(propvalue, propbuf, proplen);
2588         }
2589         return (0);
2590 }
2591 
2592 int
2593 zfs_prop_get_written_int(zfs_handle_t *zhp, const char *propname,
2594     uint64_t *propvalue)
2595 {
2596         int err;
2597         zfs_cmd_t zc = { 0 };
2598         const char *snapname;
2599 
2600         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
2601 
2602         snapname = strchr(propname, '@') + 1;
2603         if (strchr(snapname, '@')) {
2604                 (void) strlcpy(zc.zc_value, snapname, sizeof (zc.zc_value));
2605         } else {
2606                 /* snapname is the short name, append it to zhp's fsname */
2607                 char *cp;
2608 
2609                 (void) strlcpy(zc.zc_value, zhp->zfs_name,
2610                     sizeof (zc.zc_value));
2611                 cp = strchr(zc.zc_value, '@');
2612                 if (cp != NULL)
2613                         *cp = '\0';
2614                 (void) strlcat(zc.zc_value, "@", sizeof (zc.zc_value));
2615                 (void) strlcat(zc.zc_value, snapname, sizeof (zc.zc_value));
2616         }
2617 
2618         err = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SPACE_WRITTEN, &zc);
2619         if (err)
2620                 return (err);
2621 
2622         *propvalue = zc.zc_cookie;
2623         return (0);
2624 }
2625 
2626 int
2627 zfs_prop_get_written(zfs_handle_t *zhp, const char *propname,
2628     char *propbuf, int proplen, boolean_t literal)
2629 {
2630         int err;
2631         uint64_t propvalue;
2632 
2633         err = zfs_prop_get_written_int(zhp, propname, &propvalue);
2634 
2635         if (err)
2636                 return (err);
2637 
2638         if (literal) {
2639                 (void) snprintf(propbuf, proplen, "%llu", propvalue);
2640         } else {
2641                 zfs_nicenum(propvalue, propbuf, proplen);
2642         }
2643         return (0);
2644 }
2645 
2646 int
2647 zfs_get_snapused_int(zfs_handle_t *firstsnap, zfs_handle_t *lastsnap,
2648     uint64_t *usedp)
2649 {
2650         int err;
2651         zfs_cmd_t zc = { 0 };
2652 
2653         (void) strlcpy(zc.zc_name, lastsnap->zfs_name, sizeof (zc.zc_name));
2654         (void) strlcpy(zc.zc_value, firstsnap->zfs_name, sizeof (zc.zc_value));
2655 
2656         err = ioctl(lastsnap->zfs_hdl->libzfs_fd, ZFS_IOC_SPACE_SNAPS, &zc);
2657         if (err)
2658                 return (err);
2659 
2660         *usedp = zc.zc_cookie;
2661 
2662         return (0);
2663 }
2664 
2665 /*
2666  * Returns the name of the given zfs handle.
2667  */
2668 const char *
2669 zfs_get_name(const zfs_handle_t *zhp)
2670 {
2671         return (zhp->zfs_name);
2672 }
2673 
2674 /*
2675  * Returns the type of the given zfs handle.
2676  */
2677 zfs_type_t
2678 zfs_get_type(const zfs_handle_t *zhp)
2679 {
2680         return (zhp->zfs_type);
2681 }
2682 
2683 /*
2684  * Is one dataset name a child dataset of another?
2685  *
2686  * Needs to handle these cases:
2687  * Dataset 1    "a/foo"         "a/foo"         "a/foo"         "a/foo"
2688  * Dataset 2    "a/fo"          "a/foobar"      "a/bar/baz"     "a/foo/bar"
2689  * Descendant?  No.             No.             No.             Yes.
2690  */
2691 static boolean_t
2692 is_descendant(const char *ds1, const char *ds2)
2693 {
2694         size_t d1len = strlen(ds1);
2695 
2696         /* ds2 can't be a descendant if it's smaller */
2697         if (strlen(ds2) < d1len)
2698                 return (B_FALSE);
2699 
2700         /* otherwise, compare strings and verify that there's a '/' char */
2701         return (ds2[d1len] == '/' && (strncmp(ds1, ds2, d1len) == 0));
2702 }
2703 
2704 /*
2705  * Given a complete name, return just the portion that refers to the parent.
2706  * Will return -1 if there is no parent (path is just the name of the
2707  * pool).
2708  */
2709 static int
2710 parent_name(const char *path, char *buf, size_t buflen)
2711 {
2712         char *slashp;
2713 
2714         (void) strlcpy(buf, path, buflen);
2715 
2716         if ((slashp = strrchr(buf, '/')) == NULL)
2717                 return (-1);
2718         *slashp = '\0';
2719 
2720         return (0);
2721 }
2722 
2723 /*
2724  * If accept_ancestor is false, then check to make sure that the given path has
2725  * a parent, and that it exists.  If accept_ancestor is true, then find the
2726  * closest existing ancestor for the given path.  In prefixlen return the
2727  * length of already existing prefix of the given path.  We also fetch the
2728  * 'zoned' property, which is used to validate property settings when creating
2729  * new datasets.
2730  */
2731 static int
2732 check_parents(libzfs_handle_t *hdl, const char *path, uint64_t *zoned,
2733     boolean_t accept_ancestor, int *prefixlen)
2734 {
2735         zfs_cmd_t zc = { 0 };
2736         char parent[ZFS_MAXNAMELEN];
2737         char *slash;
2738         zfs_handle_t *zhp;
2739         char errbuf[1024];
2740         uint64_t is_zoned;
2741 
2742         (void) snprintf(errbuf, sizeof (errbuf),
2743             dgettext(TEXT_DOMAIN, "cannot create '%s'"), path);
2744 
2745         /* get parent, and check to see if this is just a pool */
2746         if (parent_name(path, parent, sizeof (parent)) != 0) {
2747                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2748                     "missing dataset name"));
2749                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2750         }
2751 
2752         /* check to see if the pool exists */
2753         if ((slash = strchr(parent, '/')) == NULL)
2754                 slash = parent + strlen(parent);
2755         (void) strncpy(zc.zc_name, parent, slash - parent);
2756         zc.zc_name[slash - parent] = '\0';
2757         if (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0 &&
2758             errno == ENOENT) {
2759                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2760                     "no such pool '%s'"), zc.zc_name);
2761                 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2762         }
2763 
2764         /* check to see if the parent dataset exists */
2765         while ((zhp = make_dataset_handle(hdl, parent)) == NULL) {
2766                 if (errno == ENOENT && accept_ancestor) {
2767                         /*
2768                          * Go deeper to find an ancestor, give up on top level.
2769                          */
2770                         if (parent_name(parent, parent, sizeof (parent)) != 0) {
2771                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2772                                     "no such pool '%s'"), zc.zc_name);
2773                                 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2774                         }
2775                 } else if (errno == ENOENT) {
2776                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2777                             "parent does not exist"));
2778                         return (zfs_error(hdl, EZFS_NOENT, errbuf));
2779                 } else
2780                         return (zfs_standard_error(hdl, errno, errbuf));
2781         }
2782 
2783         is_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
2784         if (zoned != NULL)
2785                 *zoned = is_zoned;
2786 
2787         /* we are in a non-global zone, but parent is in the global zone */
2788         if (getzoneid() != GLOBAL_ZONEID && !is_zoned) {
2789                 (void) zfs_standard_error(hdl, EPERM, errbuf);
2790                 zfs_close(zhp);
2791                 return (-1);
2792         }
2793 
2794         /* make sure parent is a filesystem */
2795         if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
2796                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2797                     "parent is not a filesystem"));
2798                 (void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
2799                 zfs_close(zhp);
2800                 return (-1);
2801         }
2802 
2803         zfs_close(zhp);
2804         if (prefixlen != NULL)
2805                 *prefixlen = strlen(parent);
2806         return (0);
2807 }
2808 
2809 /*
2810  * Finds whether the dataset of the given type(s) exists.
2811  */
2812 boolean_t
2813 zfs_dataset_exists(libzfs_handle_t *hdl, const char *path, zfs_type_t types)
2814 {
2815         zfs_handle_t *zhp;
2816 
2817         if (!zfs_validate_name(hdl, path, types, B_FALSE))
2818                 return (B_FALSE);
2819 
2820         /*
2821          * Try to get stats for the dataset, which will tell us if it exists.
2822          */
2823         if ((zhp = make_dataset_handle(hdl, path)) != NULL) {
2824                 int ds_type = zhp->zfs_type;
2825 
2826                 zfs_close(zhp);
2827                 if (types & ds_type)
2828                         return (B_TRUE);
2829         }
2830         return (B_FALSE);
2831 }
2832 
2833 /*
2834  * Given a path to 'target', create all the ancestors between
2835  * the prefixlen portion of the path, and the target itself.
2836  * Fail if the initial prefixlen-ancestor does not already exist.
2837  */
2838 int
2839 create_parents(libzfs_handle_t *hdl, char *target, int prefixlen)
2840 {
2841         zfs_handle_t *h;
2842         char *cp;
2843         const char *opname;
2844 
2845         /* make sure prefix exists */
2846         cp = target + prefixlen;
2847         if (*cp != '/') {
2848                 assert(strchr(cp, '/') == NULL);
2849                 h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
2850         } else {
2851                 *cp = '\0';
2852                 h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
2853                 *cp = '/';
2854         }
2855         if (h == NULL)
2856                 return (-1);
2857         zfs_close(h);
2858 
2859         /*
2860          * Attempt to create, mount, and share any ancestor filesystems,
2861          * up to the prefixlen-long one.
2862          */
2863         for (cp = target + prefixlen + 1;
2864             cp = strchr(cp, '/'); *cp = '/', cp++) {
2865                 char *logstr;
2866 
2867                 *cp = '\0';
2868 
2869                 h = make_dataset_handle(hdl, target);
2870                 if (h) {
2871                         /* it already exists, nothing to do here */
2872                         zfs_close(h);
2873                         continue;
2874                 }
2875 
2876                 logstr = hdl->libzfs_log_str;
2877                 hdl->libzfs_log_str = NULL;
2878                 if (zfs_create(hdl, target, ZFS_TYPE_FILESYSTEM,
2879                     NULL) != 0) {
2880                         hdl->libzfs_log_str = logstr;
2881                         opname = dgettext(TEXT_DOMAIN, "create");
2882                         goto ancestorerr;
2883                 }
2884 
2885                 hdl->libzfs_log_str = logstr;
2886                 h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
2887                 if (h == NULL) {
2888                         opname = dgettext(TEXT_DOMAIN, "open");
2889                         goto ancestorerr;
2890                 }
2891 
2892                 if (zfs_mount(h, NULL, 0) != 0) {
2893                         opname = dgettext(TEXT_DOMAIN, "mount");
2894                         goto ancestorerr;
2895                 }
2896 
2897                 if (zfs_share(h) != 0) {
2898                         opname = dgettext(TEXT_DOMAIN, "share");
2899                         goto ancestorerr;
2900                 }
2901 
2902                 zfs_close(h);
2903         }
2904 
2905         return (0);
2906 
2907 ancestorerr:
2908         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2909             "failed to %s ancestor '%s'"), opname, target);
2910         return (-1);
2911 }
2912 
2913 /*
2914  * Creates non-existing ancestors of the given path.
2915  */
2916 int
2917 zfs_create_ancestors(libzfs_handle_t *hdl, const char *path)
2918 {
2919         int prefix;
2920         char *path_copy;
2921         int rc;
2922 
2923         if (check_parents(hdl, path, NULL, B_TRUE, &prefix) != 0)
2924                 return (-1);
2925 
2926         if ((path_copy = strdup(path)) != NULL) {
2927                 rc = create_parents(hdl, path_copy, prefix);
2928                 free(path_copy);
2929         }
2930         if (path_copy == NULL || rc != 0)
2931                 return (-1);
2932 
2933         return (0);
2934 }
2935 
2936 /*
2937  * Create a new filesystem or volume.
2938  */
2939 int
2940 zfs_create(libzfs_handle_t *hdl, const char *path, zfs_type_t type,
2941     nvlist_t *props)
2942 {
2943         zfs_cmd_t zc = { 0 };
2944         int ret;
2945         uint64_t size = 0;
2946         uint64_t blocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
2947         char errbuf[1024];
2948         uint64_t zoned;
2949 
2950         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2951             "cannot create '%s'"), path);
2952 
2953         /* validate the path, taking care to note the extended error message */
2954         if (!zfs_validate_name(hdl, path, type, B_TRUE))
2955                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2956 
2957         /* validate parents exist */
2958         if (check_parents(hdl, path, &zoned, B_FALSE, NULL) != 0)
2959                 return (-1);
2960 
2961         /*
2962          * The failure modes when creating a dataset of a different type over
2963          * one that already exists is a little strange.  In particular, if you
2964          * try to create a dataset on top of an existing dataset, the ioctl()
2965          * will return ENOENT, not EEXIST.  To prevent this from happening, we
2966          * first try to see if the dataset exists.
2967          */
2968         (void) strlcpy(zc.zc_name, path, sizeof (zc.zc_name));
2969         if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
2970                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2971                     "dataset already exists"));
2972                 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
2973         }
2974 
2975         if (type == ZFS_TYPE_VOLUME)
2976                 zc.zc_objset_type = DMU_OST_ZVOL;
2977         else
2978                 zc.zc_objset_type = DMU_OST_ZFS;
2979 
2980         if (props && (props = zfs_valid_proplist(hdl, type, props,
2981             zoned, NULL, errbuf)) == 0)
2982                 return (-1);
2983 
2984         if (type == ZFS_TYPE_VOLUME) {
2985                 /*
2986                  * If we are creating a volume, the size and block size must
2987                  * satisfy a few restraints.  First, the blocksize must be a
2988                  * valid block size between SPA_{MIN,MAX}BLOCKSIZE.  Second, the
2989                  * volsize must be a multiple of the block size, and cannot be
2990                  * zero.
2991                  */
2992                 if (props == NULL || nvlist_lookup_uint64(props,
2993                     zfs_prop_to_name(ZFS_PROP_VOLSIZE), &size) != 0) {
2994                         nvlist_free(props);
2995                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2996                             "missing volume size"));
2997                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
2998                 }
2999 
3000                 if ((ret = nvlist_lookup_uint64(props,
3001                     zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
3002                     &blocksize)) != 0) {
3003                         if (ret == ENOENT) {
3004                                 blocksize = zfs_prop_default_numeric(
3005                                     ZFS_PROP_VOLBLOCKSIZE);
3006                         } else {
3007                                 nvlist_free(props);
3008                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3009                                     "missing volume block size"));
3010                                 return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3011                         }
3012                 }
3013 
3014                 if (size == 0) {
3015                         nvlist_free(props);
3016                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3017                             "volume size cannot be zero"));
3018                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3019                 }
3020 
3021                 if (size % blocksize != 0) {
3022                         nvlist_free(props);
3023                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3024                             "volume size must be a multiple of volume block "
3025                             "size"));
3026                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3027                 }
3028         }
3029 
3030         if (props && zcmd_write_src_nvlist(hdl, &zc, props) != 0)
3031                 return (-1);
3032         nvlist_free(props);
3033 
3034         /* create the dataset */
3035         ret = zfs_ioctl(hdl, ZFS_IOC_CREATE, &zc);
3036 
3037         zcmd_free_nvlists(&zc);
3038 
3039         /* check for failure */
3040         if (ret != 0) {
3041                 char parent[ZFS_MAXNAMELEN];
3042                 (void) parent_name(path, parent, sizeof (parent));
3043 
3044                 switch (errno) {
3045                 case ENOENT:
3046                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3047                             "no such parent '%s'"), parent);
3048                         return (zfs_error(hdl, EZFS_NOENT, errbuf));
3049 
3050                 case EINVAL:
3051                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3052                             "parent '%s' is not a filesystem"), parent);
3053                         return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3054 
3055                 case EDOM:
3056                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3057                             "volume block size must be power of 2 from "
3058                             "%u to %uk"),
3059                             (uint_t)SPA_MINBLOCKSIZE,
3060                             (uint_t)SPA_MAXBLOCKSIZE >> 10);
3061 
3062                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3063 
3064                 case ENOTSUP:
3065                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3066                             "pool must be upgraded to set this "
3067                             "property or value"));
3068                         return (zfs_error(hdl, EZFS_BADVERSION, errbuf));
3069 #ifdef _ILP32
3070                 case EOVERFLOW:
3071                         /*
3072                          * This platform can't address a volume this big.
3073                          */
3074                         if (type == ZFS_TYPE_VOLUME)
3075                                 return (zfs_error(hdl, EZFS_VOLTOOBIG,
3076                                     errbuf));
3077 #endif
3078                         /* FALLTHROUGH */
3079                 default:
3080                         return (zfs_standard_error(hdl, errno, errbuf));
3081                 }
3082         }
3083 
3084         return (0);
3085 }
3086 
3087 /*
3088  * Destroys the given dataset.  The caller must make sure that the filesystem
3089  * isn't mounted, and that there are no active dependents.
3090  */
3091 int
3092 zfs_destroy(zfs_handle_t *zhp, boolean_t defer)
3093 {
3094         zfs_cmd_t zc = { 0 };
3095 
3096         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3097 
3098         if (ZFS_IS_VOLUME(zhp)) {
3099                 zc.zc_objset_type = DMU_OST_ZVOL;
3100         } else {
3101                 zc.zc_objset_type = DMU_OST_ZFS;
3102         }
3103 
3104         zc.zc_defer_destroy = defer;
3105         if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_DESTROY, &zc) != 0) {
3106                 return (zfs_standard_error_fmt(zhp->zfs_hdl, errno,
3107                     dgettext(TEXT_DOMAIN, "cannot destroy '%s'"),
3108                     zhp->zfs_name));
3109         }
3110 
3111         remove_mountpoint(zhp);
3112 
3113         return (0);
3114 }
3115 
3116 struct destroydata {
3117         nvlist_t *nvl;
3118         const char *snapname;
3119 };
3120 
3121 static int
3122 zfs_check_snap_cb(zfs_handle_t *zhp, void *arg)
3123 {
3124         struct destroydata *dd = arg;
3125         zfs_handle_t *szhp;
3126         char name[ZFS_MAXNAMELEN];
3127         int rv = 0;
3128 
3129         (void) snprintf(name, sizeof (name),
3130             "%s@%s", zhp->zfs_name, dd->snapname);
3131 
3132         szhp = make_dataset_handle(zhp->zfs_hdl, name);
3133         if (szhp) {
3134                 verify(nvlist_add_boolean(dd->nvl, name) == 0);
3135                 zfs_close(szhp);
3136         }
3137 
3138         rv = zfs_iter_filesystems(zhp, zfs_check_snap_cb, dd);
3139         zfs_close(zhp);
3140         return (rv);
3141 }
3142 
3143 /*
3144  * Destroys all snapshots with the given name in zhp & descendants.
3145  */
3146 int
3147 zfs_destroy_snaps(zfs_handle_t *zhp, char *snapname, boolean_t defer)
3148 {
3149         int ret;
3150         struct destroydata dd = { 0 };
3151 
3152         dd.snapname = snapname;
3153         verify(nvlist_alloc(&dd.nvl, NV_UNIQUE_NAME, 0) == 0);
3154         (void) zfs_check_snap_cb(zfs_handle_dup(zhp), &dd);
3155 
3156         if (nvlist_next_nvpair(dd.nvl, NULL) == NULL) {
3157                 ret = zfs_standard_error_fmt(zhp->zfs_hdl, ENOENT,
3158                     dgettext(TEXT_DOMAIN, "cannot destroy '%s@%s'"),
3159                     zhp->zfs_name, snapname);
3160         } else {
3161                 ret = zfs_destroy_snaps_nvl(zhp, dd.nvl, defer);
3162         }
3163         nvlist_free(dd.nvl);
3164         return (ret);
3165 }
3166 
3167 /*
3168  * Destroys all the snapshots named in the nvlist.  They must be underneath
3169  * the zhp (either snapshots of it, or snapshots of its descendants).
3170  */
3171 int
3172 zfs_destroy_snaps_nvl(zfs_handle_t *zhp, nvlist_t *snaps, boolean_t defer)
3173 {
3174         int ret;
3175         zfs_cmd_t zc = { 0 };
3176 
3177         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3178         if (zcmd_write_src_nvlist(zhp->zfs_hdl, &zc, snaps) != 0)
3179                 return (-1);
3180         zc.zc_defer_destroy = defer;
3181 
3182         ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_DESTROY_SNAPS_NVL, &zc);
3183         if (ret != 0) {
3184                 char errbuf[1024];
3185 
3186                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3187                     "cannot destroy snapshots in %s"), zc.zc_name);
3188 
3189                 switch (errno) {
3190                 case EEXIST:
3191                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
3192                             "snapshot is cloned"));
3193                         return (zfs_error(zhp->zfs_hdl, EZFS_EXISTS, errbuf));
3194 
3195                 default:
3196                         return (zfs_standard_error(zhp->zfs_hdl, errno,
3197                             errbuf));
3198                 }
3199         }
3200 
3201         return (0);
3202 }
3203 
3204 /*
3205  * Clones the given dataset.  The target must be of the same type as the source.
3206  */
3207 int
3208 zfs_clone(zfs_handle_t *zhp, const char *target, nvlist_t *props)
3209 {
3210         zfs_cmd_t zc = { 0 };
3211         char parent[ZFS_MAXNAMELEN];
3212         int ret;
3213         char errbuf[1024];
3214         libzfs_handle_t *hdl = zhp->zfs_hdl;
3215         zfs_type_t type;
3216         uint64_t zoned;
3217 
3218         assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
3219 
3220         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3221             "cannot create '%s'"), target);
3222 
3223         /* validate the target/clone name */
3224         if (!zfs_validate_name(hdl, target, ZFS_TYPE_FILESYSTEM, B_TRUE))
3225                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3226 
3227         /* validate parents exist */
3228         if (check_parents(hdl, target, &zoned, B_FALSE, NULL) != 0)
3229                 return (-1);
3230 
3231         (void) parent_name(target, parent, sizeof (parent));
3232 
3233         /* do the clone */
3234         if (ZFS_IS_VOLUME(zhp)) {
3235                 zc.zc_objset_type = DMU_OST_ZVOL;
3236                 type = ZFS_TYPE_VOLUME;
3237         } else {
3238                 zc.zc_objset_type = DMU_OST_ZFS;
3239                 type = ZFS_TYPE_FILESYSTEM;
3240         }
3241 
3242         if (props) {
3243                 if ((props = zfs_valid_proplist(hdl, type, props, zoned,
3244                     zhp, errbuf)) == NULL)
3245                         return (-1);
3246 
3247                 if (zcmd_write_src_nvlist(hdl, &zc, props) != 0) {
3248                         nvlist_free(props);
3249                         return (-1);
3250                 }
3251 
3252                 nvlist_free(props);
3253         }
3254 
3255         (void) strlcpy(zc.zc_name, target, sizeof (zc.zc_name));
3256         (void) strlcpy(zc.zc_value, zhp->zfs_name, sizeof (zc.zc_value));
3257         ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_CREATE, &zc);
3258 
3259         zcmd_free_nvlists(&zc);
3260 
3261         if (ret != 0) {
3262                 switch (errno) {
3263 
3264                 case ENOENT:
3265                         /*
3266                          * The parent doesn't exist.  We should have caught this
3267                          * above, but there may a race condition that has since
3268                          * destroyed the parent.
3269                          *
3270                          * At this point, we don't know whether it's the source
3271                          * that doesn't exist anymore, or whether the target
3272                          * dataset doesn't exist.
3273                          */
3274                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
3275                             "no such parent '%s'"), parent);
3276                         return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
3277 
3278                 case EXDEV:
3279                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
3280                             "source and target pools differ"));
3281                         return (zfs_error(zhp->zfs_hdl, EZFS_CROSSTARGET,
3282                             errbuf));
3283 
3284                 default:
3285                         return (zfs_standard_error(zhp->zfs_hdl, errno,
3286                             errbuf));
3287                 }
3288         }
3289 
3290         return (ret);
3291 }
3292 
3293 /*
3294  * Promotes the given clone fs to be the clone parent.
3295  */
3296 int
3297 zfs_promote(zfs_handle_t *zhp)
3298 {
3299         libzfs_handle_t *hdl = zhp->zfs_hdl;
3300         zfs_cmd_t zc = { 0 };
3301         char parent[MAXPATHLEN];
3302         int ret;
3303         char errbuf[1024];
3304 
3305         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3306             "cannot promote '%s'"), zhp->zfs_name);
3307 
3308         if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
3309                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3310                     "snapshots can not be promoted"));
3311                 return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3312         }
3313 
3314         (void) strlcpy(parent, zhp->zfs_dmustats.dds_origin, sizeof (parent));
3315         if (parent[0] == '\0') {
3316                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3317                     "not a cloned filesystem"));
3318                 return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3319         }
3320 
3321         (void) strlcpy(zc.zc_value, zhp->zfs_dmustats.dds_origin,
3322             sizeof (zc.zc_value));
3323         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3324         ret = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
3325 
3326         if (ret != 0) {
3327                 int save_errno = errno;
3328 
3329                 switch (save_errno) {
3330                 case EEXIST:
3331                         /* There is a conflicting snapshot name. */
3332                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3333                             "conflicting snapshot '%s' from parent '%s'"),
3334                             zc.zc_string, parent);
3335                         return (zfs_error(hdl, EZFS_EXISTS, errbuf));
3336 
3337                 default:
3338                         return (zfs_standard_error(hdl, save_errno, errbuf));
3339                 }
3340         }
3341         return (ret);
3342 }
3343 
3344 /*
3345  * Takes a snapshot of the given dataset.
3346  */
3347 int
3348 zfs_snapshot(libzfs_handle_t *hdl, const char *path, boolean_t recursive,
3349     nvlist_t *props)
3350 {
3351         const char *delim;
3352         char parent[ZFS_MAXNAMELEN];
3353         zfs_handle_t *zhp;
3354         zfs_cmd_t zc = { 0 };
3355         int ret;
3356         char errbuf[1024];
3357 
3358         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3359             "cannot snapshot '%s'"), path);
3360 
3361         /* validate the target name */
3362         if (!zfs_validate_name(hdl, path, ZFS_TYPE_SNAPSHOT, B_TRUE))
3363                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3364 
3365         if (props) {
3366                 if ((props = zfs_valid_proplist(hdl, ZFS_TYPE_SNAPSHOT,
3367                     props, B_FALSE, NULL, errbuf)) == NULL)
3368                         return (-1);
3369 
3370                 if (zcmd_write_src_nvlist(hdl, &zc, props) != 0) {
3371                         nvlist_free(props);
3372                         return (-1);
3373                 }
3374 
3375                 nvlist_free(props);
3376         }
3377 
3378         /* make sure the parent exists and is of the appropriate type */
3379         delim = strchr(path, '@');
3380         (void) strncpy(parent, path, delim - path);
3381         parent[delim - path] = '\0';
3382 
3383         if ((zhp = zfs_open(hdl, parent, ZFS_TYPE_FILESYSTEM |
3384             ZFS_TYPE_VOLUME)) == NULL) {
3385                 zcmd_free_nvlists(&zc);
3386                 return (-1);
3387         }
3388 
3389         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3390         (void) strlcpy(zc.zc_value, delim+1, sizeof (zc.zc_value));
3391         if (ZFS_IS_VOLUME(zhp))
3392                 zc.zc_objset_type = DMU_OST_ZVOL;
3393         else
3394                 zc.zc_objset_type = DMU_OST_ZFS;
3395         zc.zc_cookie = recursive;
3396         ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SNAPSHOT, &zc);
3397 
3398         zcmd_free_nvlists(&zc);
3399 
3400         /*
3401          * if it was recursive, the one that actually failed will be in
3402          * zc.zc_name.
3403          */
3404         if (ret != 0) {
3405                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3406                     "cannot create snapshot '%s@%s'"), zc.zc_name, zc.zc_value);
3407                 (void) zfs_standard_error(hdl, errno, errbuf);
3408         }
3409 
3410         zfs_close(zhp);
3411 
3412         return (ret);
3413 }
3414 
3415 /*
3416  * Destroy any more recent snapshots.  We invoke this callback on any dependents
3417  * of the snapshot first.  If the 'cb_dependent' member is non-zero, then this
3418  * is a dependent and we should just destroy it without checking the transaction
3419  * group.
3420  */
3421 typedef struct rollback_data {
3422         const char      *cb_target;             /* the snapshot */
3423         uint64_t        cb_create;              /* creation time reference */
3424         boolean_t       cb_error;
3425         boolean_t       cb_dependent;
3426         boolean_t       cb_force;
3427 } rollback_data_t;
3428 
3429 static int
3430 rollback_destroy(zfs_handle_t *zhp, void *data)
3431 {
3432         rollback_data_t *cbp = data;
3433 
3434         if (!cbp->cb_dependent) {
3435                 if (strcmp(zhp->zfs_name, cbp->cb_target) != 0 &&
3436                     zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
3437                     zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) >
3438                     cbp->cb_create) {
3439                         char *logstr;
3440 
3441                         cbp->cb_dependent = B_TRUE;
3442                         cbp->cb_error |= zfs_iter_dependents(zhp, B_FALSE,
3443                             rollback_destroy, cbp);
3444                         cbp->cb_dependent = B_FALSE;
3445 
3446                         logstr = zhp->zfs_hdl->libzfs_log_str;
3447                         zhp->zfs_hdl->libzfs_log_str = NULL;
3448                         cbp->cb_error |= zfs_destroy(zhp, B_FALSE);
3449                         zhp->zfs_hdl->libzfs_log_str = logstr;
3450                 }
3451         } else {
3452                 /* We must destroy this clone; first unmount it */
3453                 prop_changelist_t *clp;
3454 
3455                 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
3456                     cbp->cb_force ? MS_FORCE: 0);
3457                 if (clp == NULL || changelist_prefix(clp) != 0) {
3458                         cbp->cb_error = B_TRUE;
3459                         zfs_close(zhp);
3460                         return (0);
3461                 }
3462                 if (zfs_destroy(zhp, B_FALSE) != 0)
3463                         cbp->cb_error = B_TRUE;
3464                 else
3465                         changelist_remove(clp, zhp->zfs_name);
3466                 (void) changelist_postfix(clp);
3467                 changelist_free(clp);
3468         }
3469 
3470         zfs_close(zhp);
3471         return (0);
3472 }
3473 
3474 /*
3475  * Given a dataset, rollback to a specific snapshot, discarding any
3476  * data changes since then and making it the active dataset.
3477  *
3478  * Any snapshots more recent than the target are destroyed, along with
3479  * their dependents.
3480  */
3481 int
3482 zfs_rollback(zfs_handle_t *zhp, zfs_handle_t *snap, boolean_t force)
3483 {
3484         rollback_data_t cb = { 0 };
3485         int err;
3486         zfs_cmd_t zc = { 0 };
3487         boolean_t restore_resv = 0;
3488         uint64_t old_volsize, new_volsize;
3489         zfs_prop_t resv_prop;
3490 
3491         assert(zhp->zfs_type == ZFS_TYPE_FILESYSTEM ||
3492             zhp->zfs_type == ZFS_TYPE_VOLUME);
3493 
3494         /*
3495          * Destroy all recent snapshots and its dependends.
3496          */
3497         cb.cb_force = force;
3498         cb.cb_target = snap->zfs_name;
3499         cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
3500         (void) zfs_iter_children(zhp, rollback_destroy, &cb);
3501 
3502         if (cb.cb_error)
3503                 return (-1);
3504 
3505         /*
3506          * Now that we have verified that the snapshot is the latest,
3507          * rollback to the given snapshot.
3508          */
3509 
3510         if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
3511                 if (zfs_which_resv_prop(zhp, &resv_prop) < 0)
3512                         return (-1);
3513                 old_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
3514                 restore_resv =
3515                     (old_volsize == zfs_prop_get_int(zhp, resv_prop));
3516         }
3517 
3518         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3519 
3520         if (ZFS_IS_VOLUME(zhp))
3521                 zc.zc_objset_type = DMU_OST_ZVOL;
3522         else
3523                 zc.zc_objset_type = DMU_OST_ZFS;
3524 
3525         /*
3526          * We rely on zfs_iter_children() to verify that there are no
3527          * newer snapshots for the given dataset.  Therefore, we can
3528          * simply pass the name on to the ioctl() call.  There is still
3529          * an unlikely race condition where the user has taken a
3530          * snapshot since we verified that this was the most recent.
3531          *
3532          */
3533         if ((err = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_ROLLBACK, &zc)) != 0) {
3534                 (void) zfs_standard_error_fmt(zhp->zfs_hdl, errno,
3535                     dgettext(TEXT_DOMAIN, "cannot rollback '%s'"),
3536                     zhp->zfs_name);
3537                 return (err);
3538         }
3539 
3540         /*
3541          * For volumes, if the pre-rollback volsize matched the pre-
3542          * rollback reservation and the volsize has changed then set
3543          * the reservation property to the post-rollback volsize.
3544          * Make a new handle since the rollback closed the dataset.
3545          */
3546         if ((zhp->zfs_type == ZFS_TYPE_VOLUME) &&
3547             (zhp = make_dataset_handle(zhp->zfs_hdl, zhp->zfs_name))) {
3548                 if (restore_resv) {
3549                         new_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
3550                         if (old_volsize != new_volsize)
3551                                 err = zfs_prop_set_int(zhp, resv_prop,
3552                                     new_volsize);
3553                 }
3554                 zfs_close(zhp);
3555         }
3556         return (err);
3557 }
3558 
3559 /*
3560  * Renames the given dataset.
3561  */
3562 int
3563 zfs_rename(zfs_handle_t *zhp, const char *target, boolean_t recursive,
3564     boolean_t force_unmount)
3565 {
3566         int ret;
3567         zfs_cmd_t zc = { 0 };
3568         char *delim;
3569         prop_changelist_t *cl = NULL;
3570         zfs_handle_t *zhrp = NULL;
3571         char *parentname = NULL;
3572         char parent[ZFS_MAXNAMELEN];
3573         libzfs_handle_t *hdl = zhp->zfs_hdl;
3574         char errbuf[1024];
3575 
3576         /* if we have the same exact name, just return success */
3577         if (strcmp(zhp->zfs_name, target) == 0)
3578                 return (0);
3579 
3580         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3581             "cannot rename to '%s'"), target);
3582 
3583         /*
3584          * Make sure the target name is valid
3585          */
3586         if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
3587                 if ((strchr(target, '@') == NULL) ||
3588                     *target == '@') {
3589                         /*
3590                          * Snapshot target name is abbreviated,
3591                          * reconstruct full dataset name
3592                          */
3593                         (void) strlcpy(parent, zhp->zfs_name,
3594                             sizeof (parent));
3595                         delim = strchr(parent, '@');
3596                         if (strchr(target, '@') == NULL)
3597                                 *(++delim) = '\0';
3598                         else
3599                                 *delim = '\0';
3600                         (void) strlcat(parent, target, sizeof (parent));
3601                         target = parent;
3602                 } else {
3603                         /*
3604                          * Make sure we're renaming within the same dataset.
3605                          */
3606                         delim = strchr(target, '@');
3607                         if (strncmp(zhp->zfs_name, target, delim - target)
3608                             != 0 || zhp->zfs_name[delim - target] != '@') {
3609                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3610                                     "snapshots must be part of same "
3611                                     "dataset"));
3612                                 return (zfs_error(hdl, EZFS_CROSSTARGET,
3613                                     errbuf));
3614                         }
3615                 }
3616                 if (!zfs_validate_name(hdl, target, zhp->zfs_type, B_TRUE))
3617                         return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3618         } else {
3619                 if (recursive) {
3620                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3621                             "recursive rename must be a snapshot"));
3622                         return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3623                 }
3624 
3625                 if (!zfs_validate_name(hdl, target, zhp->zfs_type, B_TRUE))
3626                         return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3627 
3628                 /* validate parents */
3629                 if (check_parents(hdl, target, NULL, B_FALSE, NULL) != 0)
3630                         return (-1);
3631 
3632                 /* make sure we're in the same pool */
3633                 verify((delim = strchr(target, '/')) != NULL);
3634                 if (strncmp(zhp->zfs_name, target, delim - target) != 0 ||
3635                     zhp->zfs_name[delim - target] != '/') {
3636                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3637                             "datasets must be within same pool"));
3638                         return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
3639                 }
3640 
3641                 /* new name cannot be a child of the current dataset name */
3642                 if (is_descendant(zhp->zfs_name, target)) {
3643                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3644                             "New dataset name cannot be a descendant of "
3645                             "current dataset name"));
3646                         return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3647                 }
3648         }
3649 
3650         (void) snprintf(errbuf, sizeof (errbuf),
3651             dgettext(TEXT_DOMAIN, "cannot rename '%s'"), zhp->zfs_name);
3652 
3653         if (getzoneid() == GLOBAL_ZONEID &&
3654             zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) {
3655                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3656                     "dataset is used in a non-global zone"));
3657                 return (zfs_error(hdl, EZFS_ZONED, errbuf));
3658         }
3659 
3660         if (recursive) {
3661 
3662                 parentname = zfs_strdup(zhp->zfs_hdl, zhp->zfs_name);
3663                 if (parentname == NULL) {
3664                         ret = -1;
3665                         goto error;
3666                 }
3667                 delim = strchr(parentname, '@');
3668                 *delim = '\0';
3669                 zhrp = zfs_open(zhp->zfs_hdl, parentname, ZFS_TYPE_DATASET);
3670                 if (zhrp == NULL) {
3671                         ret = -1;
3672                         goto error;
3673                 }
3674 
3675         } else {
3676                 if ((cl = changelist_gather(zhp, ZFS_PROP_NAME, 0,
3677                     force_unmount ? MS_FORCE : 0)) == NULL)
3678                         return (-1);
3679 
3680                 if (changelist_haszonedchild(cl)) {
3681                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3682                             "child dataset with inherited mountpoint is used "
3683                             "in a non-global zone"));
3684                         (void) zfs_error(hdl, EZFS_ZONED, errbuf);
3685                         goto error;
3686                 }
3687 
3688                 if ((ret = changelist_prefix(cl)) != 0)
3689                         goto error;
3690         }
3691 
3692         if (ZFS_IS_VOLUME(zhp))
3693                 zc.zc_objset_type = DMU_OST_ZVOL;
3694         else
3695                 zc.zc_objset_type = DMU_OST_ZFS;
3696 
3697         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3698         (void) strlcpy(zc.zc_value, target, sizeof (zc.zc_value));
3699 
3700         zc.zc_cookie = recursive;
3701 
3702         if ((ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_RENAME, &zc)) != 0) {
3703                 /*
3704                  * if it was recursive, the one that actually failed will
3705                  * be in zc.zc_name
3706                  */
3707                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3708                     "cannot rename '%s'"), zc.zc_name);
3709 
3710                 if (recursive && errno == EEXIST) {
3711                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3712                             "a child dataset already has a snapshot "
3713                             "with the new name"));
3714                         (void) zfs_error(hdl, EZFS_EXISTS, errbuf);
3715                 } else {
3716                         (void) zfs_standard_error(zhp->zfs_hdl, errno, errbuf);
3717                 }
3718 
3719                 /*
3720                  * On failure, we still want to remount any filesystems that
3721                  * were previously mounted, so we don't alter the system state.
3722                  */
3723                 if (!recursive)
3724                         (void) changelist_postfix(cl);
3725         } else {
3726                 if (!recursive) {
3727                         changelist_rename(cl, zfs_get_name(zhp), target);
3728                         ret = changelist_postfix(cl);
3729                 }
3730         }
3731 
3732 error:
3733         if (parentname) {
3734                 free(parentname);
3735         }
3736         if (zhrp) {
3737                 zfs_close(zhrp);
3738         }
3739         if (cl) {
3740                 changelist_free(cl);
3741         }
3742         return (ret);
3743 }
3744 
3745 nvlist_t *
3746 zfs_get_user_props(zfs_handle_t *zhp)
3747 {
3748         return (zhp->zfs_user_props);
3749 }
3750 
3751 nvlist_t *
3752 zfs_get_recvd_props(zfs_handle_t *zhp)
3753 {
3754         if (zhp->zfs_recvd_props == NULL)
3755                 if (get_recvd_props_ioctl(zhp) != 0)
3756                         return (NULL);
3757         return (zhp->zfs_recvd_props);
3758 }
3759 
3760 /*
3761  * This function is used by 'zfs list' to determine the exact set of columns to
3762  * display, and their maximum widths.  This does two main things:
3763  *
3764  *      - If this is a list of all properties, then expand the list to include
3765  *        all native properties, and set a flag so that for each dataset we look
3766  *        for new unique user properties and add them to the list.
3767  *
3768  *      - For non fixed-width properties, keep track of the maximum width seen
3769  *        so that we can size the column appropriately. If the user has
3770  *        requested received property values, we also need to compute the width
3771  *        of the RECEIVED column.
3772  */
3773 int
3774 zfs_expand_proplist(zfs_handle_t *zhp, zprop_list_t **plp, boolean_t received)
3775 {
3776         libzfs_handle_t *hdl = zhp->zfs_hdl;
3777         zprop_list_t *entry;
3778         zprop_list_t **last, **start;
3779         nvlist_t *userprops, *propval;
3780         nvpair_t *elem;
3781         char *strval;
3782         char buf[ZFS_MAXPROPLEN];
3783 
3784         if (zprop_expand_list(hdl, plp, ZFS_TYPE_DATASET) != 0)
3785                 return (-1);
3786 
3787         userprops = zfs_get_user_props(zhp);
3788 
3789         entry = *plp;
3790         if (entry->pl_all && nvlist_next_nvpair(userprops, NULL) != NULL) {
3791                 /*
3792                  * Go through and add any user properties as necessary.  We
3793                  * start by incrementing our list pointer to the first
3794                  * non-native property.
3795                  */
3796                 start = plp;
3797                 while (*start != NULL) {
3798                         if ((*start)->pl_prop == ZPROP_INVAL)
3799                                 break;
3800                         start = &(*start)->pl_next;
3801                 }
3802 
3803                 elem = NULL;
3804                 while ((elem = nvlist_next_nvpair(userprops, elem)) != NULL) {
3805                         /*
3806                          * See if we've already found this property in our list.
3807                          */
3808                         for (last = start; *last != NULL;
3809                             last = &(*last)->pl_next) {
3810                                 if (strcmp((*last)->pl_user_prop,
3811                                     nvpair_name(elem)) == 0)
3812                                         break;
3813                         }
3814 
3815                         if (*last == NULL) {
3816                                 if ((entry = zfs_alloc(hdl,
3817                                     sizeof (zprop_list_t))) == NULL ||
3818                                     ((entry->pl_user_prop = zfs_strdup(hdl,
3819                                     nvpair_name(elem)))) == NULL) {
3820                                         free(entry);
3821                                         return (-1);
3822                                 }
3823 
3824                                 entry->pl_prop = ZPROP_INVAL;
3825                                 entry->pl_width = strlen(nvpair_name(elem));
3826                                 entry->pl_all = B_TRUE;
3827                                 *last = entry;
3828                         }
3829                 }
3830         }
3831 
3832         /*
3833          * Now go through and check the width of any non-fixed columns
3834          */
3835         for (entry = *plp; entry != NULL; entry = entry->pl_next) {
3836                 if (entry->pl_fixed)
3837                         continue;
3838 
3839                 if (entry->pl_prop != ZPROP_INVAL) {
3840                         if (zfs_prop_get(zhp, entry->pl_prop,
3841                             buf, sizeof (buf), NULL, NULL, 0, B_FALSE) == 0) {
3842                                 if (strlen(buf) > entry->pl_width)
3843                                         entry->pl_width = strlen(buf);
3844                         }
3845                         if (received && zfs_prop_get_recvd(zhp,
3846                             zfs_prop_to_name(entry->pl_prop),
3847                             buf, sizeof (buf), B_FALSE) == 0)
3848                                 if (strlen(buf) > entry->pl_recvd_width)
3849                                         entry->pl_recvd_width = strlen(buf);
3850                 } else {
3851                         if (nvlist_lookup_nvlist(userprops, entry->pl_user_prop,
3852                             &propval) == 0) {
3853                                 verify(nvlist_lookup_string(propval,
3854                                     ZPROP_VALUE, &strval) == 0);
3855                                 if (strlen(strval) > entry->pl_width)
3856                                         entry->pl_width = strlen(strval);
3857                         }
3858                         if (received && zfs_prop_get_recvd(zhp,
3859                             entry->pl_user_prop,
3860                             buf, sizeof (buf), B_FALSE) == 0)
3861                                 if (strlen(buf) > entry->pl_recvd_width)
3862                                         entry->pl_recvd_width = strlen(buf);
3863                 }
3864         }
3865 
3866         return (0);
3867 }
3868 
3869 int
3870 zfs_deleg_share_nfs(libzfs_handle_t *hdl, char *dataset, char *path,
3871     char *resource, void *export, void *sharetab,
3872     int sharemax, zfs_share_op_t operation)
3873 {
3874         zfs_cmd_t zc = { 0 };
3875         int error;
3876 
3877         (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
3878         (void) strlcpy(zc.zc_value, path, sizeof (zc.zc_value));
3879         if (resource)
3880                 (void) strlcpy(zc.zc_string, resource, sizeof (zc.zc_string));
3881         zc.zc_share.z_sharedata = (uint64_t)(uintptr_t)sharetab;
3882         zc.zc_share.z_exportdata = (uint64_t)(uintptr_t)export;
3883         zc.zc_share.z_sharetype = operation;
3884         zc.zc_share.z_sharemax = sharemax;
3885         error = ioctl(hdl->libzfs_fd, ZFS_IOC_SHARE, &zc);
3886         return (error);
3887 }
3888 
3889 void
3890 zfs_prune_proplist(zfs_handle_t *zhp, uint8_t *props)
3891 {
3892         nvpair_t *curr;
3893 
3894         /*
3895          * Keep a reference to the props-table against which we prune the
3896          * properties.
3897          */
3898         zhp->zfs_props_table = props;
3899 
3900         curr = nvlist_next_nvpair(zhp->zfs_props, NULL);
3901 
3902         while (curr) {
3903                 zfs_prop_t zfs_prop = zfs_name_to_prop(nvpair_name(curr));
3904                 nvpair_t *next = nvlist_next_nvpair(zhp->zfs_props, curr);
3905 
3906                 /*
3907                  * User properties will result in ZPROP_INVAL, and since we
3908                  * only know how to prune standard ZFS properties, we always
3909                  * leave these in the list.  This can also happen if we
3910                  * encounter an unknown DSL property (when running older
3911                  * software, for example).
3912                  */
3913                 if (zfs_prop != ZPROP_INVAL && props[zfs_prop] == B_FALSE)
3914                         (void) nvlist_remove(zhp->zfs_props,
3915                             nvpair_name(curr), nvpair_type(curr));
3916                 curr = next;
3917         }
3918 }
3919 
3920 static int
3921 zfs_smb_acl_mgmt(libzfs_handle_t *hdl, char *dataset, char *path,
3922     zfs_smb_acl_op_t cmd, char *resource1, char *resource2)
3923 {
3924         zfs_cmd_t zc = { 0 };
3925         nvlist_t *nvlist = NULL;
3926         int error;
3927 
3928         (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
3929         (void) strlcpy(zc.zc_value, path, sizeof (zc.zc_value));
3930         zc.zc_cookie = (uint64_t)cmd;
3931 
3932         if (cmd == ZFS_SMB_ACL_RENAME) {
3933                 if (nvlist_alloc(&nvlist, NV_UNIQUE_NAME, 0) != 0) {
3934                         (void) no_memory(hdl);
3935                         return (NULL);
3936                 }
3937         }
3938 
3939         switch (cmd) {
3940         case ZFS_SMB_ACL_ADD:
3941         case ZFS_SMB_ACL_REMOVE:
3942                 (void) strlcpy(zc.zc_string, resource1, sizeof (zc.zc_string));
3943                 break;
3944         case ZFS_SMB_ACL_RENAME:
3945                 if (nvlist_add_string(nvlist, ZFS_SMB_ACL_SRC,
3946                     resource1) != 0) {
3947                                 (void) no_memory(hdl);
3948                                 return (-1);
3949                 }
3950                 if (nvlist_add_string(nvlist, ZFS_SMB_ACL_TARGET,
3951                     resource2) != 0) {
3952                                 (void) no_memory(hdl);
3953                                 return (-1);
3954                 }
3955                 if (zcmd_write_src_nvlist(hdl, &zc, nvlist) != 0) {
3956                         nvlist_free(nvlist);
3957                         return (-1);
3958                 }
3959                 break;
3960         case ZFS_SMB_ACL_PURGE:
3961                 break;
3962         default:
3963                 return (-1);
3964         }
3965         error = ioctl(hdl->libzfs_fd, ZFS_IOC_SMB_ACL, &zc);
3966         if (nvlist)
3967                 nvlist_free(nvlist);
3968         return (error);
3969 }
3970 
3971 int
3972 zfs_smb_acl_add(libzfs_handle_t *hdl, char *dataset,
3973     char *path, char *resource)
3974 {
3975         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_ADD,
3976             resource, NULL));
3977 }
3978 
3979 int
3980 zfs_smb_acl_remove(libzfs_handle_t *hdl, char *dataset,
3981     char *path, char *resource)
3982 {
3983         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_REMOVE,
3984             resource, NULL));
3985 }
3986 
3987 int
3988 zfs_smb_acl_purge(libzfs_handle_t *hdl, char *dataset, char *path)
3989 {
3990         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_PURGE,
3991             NULL, NULL));
3992 }
3993 
3994 int
3995 zfs_smb_acl_rename(libzfs_handle_t *hdl, char *dataset, char *path,
3996     char *oldname, char *newname)
3997 {
3998         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_RENAME,
3999             oldname, newname));
4000 }
4001 
4002 int
4003 zfs_userspace(zfs_handle_t *zhp, zfs_userquota_prop_t type,
4004     zfs_userspace_cb_t func, void *arg)
4005 {
4006         zfs_cmd_t zc = { 0 };
4007         int error;
4008         zfs_useracct_t buf[100];
4009 
4010         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
4011 
4012         zc.zc_objset_type = type;
4013         zc.zc_nvlist_dst = (uintptr_t)buf;
4014 
4015         /* CONSTCOND */
4016         while (1) {
4017                 zfs_useracct_t *zua = buf;
4018 
4019                 zc.zc_nvlist_dst_size = sizeof (buf);
4020                 error = ioctl(zhp->zfs_hdl->libzfs_fd,
4021                     ZFS_IOC_USERSPACE_MANY, &zc);
4022                 if (error || zc.zc_nvlist_dst_size == 0)
4023                         break;
4024 
4025                 while (zc.zc_nvlist_dst_size > 0) {
4026                         error = func(arg, zua->zu_domain, zua->zu_rid,
4027                             zua->zu_space);
4028                         if (error != 0)
4029                                 return (error);
4030                         zua++;
4031                         zc.zc_nvlist_dst_size -= sizeof (zfs_useracct_t);
4032                 }
4033         }
4034 
4035         return (error);
4036 }
4037 
4038 int
4039 zfs_hold(zfs_handle_t *zhp, const char *snapname, const char *tag,
4040     boolean_t recursive, boolean_t temphold, boolean_t enoent_ok,
4041     int cleanup_fd, uint64_t dsobj, uint64_t createtxg)
4042 {
4043         zfs_cmd_t zc = { 0 };
4044         libzfs_handle_t *hdl = zhp->zfs_hdl;
4045 
4046         ASSERT(!recursive || dsobj == 0);
4047 
4048         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
4049         (void) strlcpy(zc.zc_value, snapname, sizeof (zc.zc_value));
4050         if (strlcpy(zc.zc_string, tag, sizeof (zc.zc_string))
4051             >= sizeof (zc.zc_string))
4052                 return (zfs_error(hdl, EZFS_TAGTOOLONG, tag));
4053         zc.zc_cookie = recursive;
4054         zc.zc_temphold = temphold;
4055         zc.zc_cleanup_fd = cleanup_fd;
4056         zc.zc_sendobj = dsobj;
4057         zc.zc_createtxg = createtxg;
4058 
4059         if (zfs_ioctl(hdl, ZFS_IOC_HOLD, &zc) != 0) {
4060                 char errbuf[ZFS_MAXNAMELEN+32];
4061 
4062                 /*
4063                  * if it was recursive, the one that actually failed will be in
4064                  * zc.zc_name.
4065                  */
4066                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
4067                     "cannot hold '%s@%s'"), zc.zc_name, snapname);
4068                 switch (errno) {
4069                 case E2BIG:
4070                         /*
4071                          * Temporary tags wind up having the ds object id
4072                          * prepended. So even if we passed the length check
4073                          * above, it's still possible for the tag to wind
4074                          * up being slightly too long.
4075                          */
4076                         return (zfs_error(hdl, EZFS_TAGTOOLONG, errbuf));
4077                 case ENOTSUP:
4078                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4079                             "pool must be upgraded"));
4080                         return (zfs_error(hdl, EZFS_BADVERSION, errbuf));
4081                 case EINVAL:
4082                         return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
4083                 case EEXIST:
4084                         return (zfs_error(hdl, EZFS_REFTAG_HOLD, errbuf));
4085                 case ENOENT:
4086                         if (enoent_ok)
4087                                 return (ENOENT);
4088                         /* FALLTHROUGH */
4089                 default:
4090                         return (zfs_standard_error_fmt(hdl, errno, errbuf));
4091                 }
4092         }
4093 
4094         return (0);
4095 }
4096 
4097 int
4098 zfs_release(zfs_handle_t *zhp, const char *snapname, const char *tag,
4099     boolean_t recursive)
4100 {
4101         zfs_cmd_t zc = { 0 };
4102         libzfs_handle_t *hdl = zhp->zfs_hdl;
4103 
4104         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
4105         (void) strlcpy(zc.zc_value, snapname, sizeof (zc.zc_value));
4106         if (strlcpy(zc.zc_string, tag, sizeof (zc.zc_string))
4107             >= sizeof (zc.zc_string))
4108                 return (zfs_error(hdl, EZFS_TAGTOOLONG, tag));
4109         zc.zc_cookie = recursive;
4110 
4111         if (zfs_ioctl(hdl, ZFS_IOC_RELEASE, &zc) != 0) {
4112                 char errbuf[ZFS_MAXNAMELEN+32];
4113 
4114                 /*
4115                  * if it was recursive, the one that actually failed will be in
4116                  * zc.zc_name.
4117                  */
4118                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
4119                     "cannot release '%s' from '%s@%s'"), tag, zc.zc_name,
4120                     snapname);
4121                 switch (errno) {
4122                 case ESRCH:
4123                         return (zfs_error(hdl, EZFS_REFTAG_RELE, errbuf));
4124                 case ENOTSUP:
4125                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4126                             "pool must be upgraded"));
4127                         return (zfs_error(hdl, EZFS_BADVERSION, errbuf));
4128                 case EINVAL:
4129                         return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
4130                 default:
4131                         return (zfs_standard_error_fmt(hdl, errno, errbuf));
4132                 }
4133         }
4134 
4135         return (0);
4136 }
4137 
4138 int
4139 zfs_get_fsacl(zfs_handle_t *zhp, nvlist_t **nvl)
4140 {
4141         zfs_cmd_t zc = { 0 };
4142         libzfs_handle_t *hdl = zhp->zfs_hdl;
4143         int nvsz = 2048;
4144         void *nvbuf;
4145         int err = 0;
4146         char errbuf[ZFS_MAXNAMELEN+32];
4147 
4148         assert(zhp->zfs_type == ZFS_TYPE_VOLUME ||
4149             zhp->zfs_type == ZFS_TYPE_FILESYSTEM);
4150 
4151 tryagain:
4152 
4153         nvbuf = malloc(nvsz);
4154         if (nvbuf == NULL) {
4155                 err = (zfs_error(hdl, EZFS_NOMEM, strerror(errno)));
4156                 goto out;
4157         }
4158 
4159         zc.zc_nvlist_dst_size = nvsz;
4160         zc.zc_nvlist_dst = (uintptr_t)nvbuf;
4161 
4162         (void) strlcpy(zc.zc_name, zhp->zfs_name, ZFS_MAXNAMELEN);
4163 
4164         if (ioctl(hdl->libzfs_fd, ZFS_IOC_GET_FSACL, &zc) != 0) {
4165                 (void) snprintf(errbuf, sizeof (errbuf),
4166                     dgettext(TEXT_DOMAIN, "cannot get permissions on '%s'"),
4167                     zc.zc_name);
4168                 switch (errno) {
4169                 case ENOMEM:
4170                         free(nvbuf);
4171                         nvsz = zc.zc_nvlist_dst_size;
4172                         goto tryagain;
4173 
4174                 case ENOTSUP:
4175                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4176                             "pool must be upgraded"));
4177                         err = zfs_error(hdl, EZFS_BADVERSION, errbuf);
4178                         break;
4179                 case EINVAL:
4180                         err = zfs_error(hdl, EZFS_BADTYPE, errbuf);
4181                         break;
4182                 case ENOENT:
4183                         err = zfs_error(hdl, EZFS_NOENT, errbuf);
4184                         break;
4185                 default:
4186                         err = zfs_standard_error_fmt(hdl, errno, errbuf);
4187                         break;
4188                 }
4189         } else {
4190                 /* success */
4191                 int rc = nvlist_unpack(nvbuf, zc.zc_nvlist_dst_size, nvl, 0);
4192                 if (rc) {
4193                         (void) snprintf(errbuf, sizeof (errbuf), dgettext(
4194                             TEXT_DOMAIN, "cannot get permissions on '%s'"),
4195                             zc.zc_name);
4196                         err = zfs_standard_error_fmt(hdl, rc, errbuf);
4197                 }
4198         }
4199 
4200         free(nvbuf);
4201 out:
4202         return (err);
4203 }
4204 
4205 int
4206 zfs_set_fsacl(zfs_handle_t *zhp, boolean_t un, nvlist_t *nvl)
4207 {
4208         zfs_cmd_t zc = { 0 };
4209         libzfs_handle_t *hdl = zhp->zfs_hdl;
4210         char *nvbuf;
4211         char errbuf[ZFS_MAXNAMELEN+32];
4212         size_t nvsz;
4213         int err;
4214 
4215         assert(zhp->zfs_type == ZFS_TYPE_VOLUME ||
4216             zhp->zfs_type == ZFS_TYPE_FILESYSTEM);
4217 
4218         err = nvlist_size(nvl, &nvsz, NV_ENCODE_NATIVE);
4219         assert(err == 0);
4220 
4221         nvbuf = malloc(nvsz);
4222 
4223         err = nvlist_pack(nvl, &nvbuf, &nvsz, NV_ENCODE_NATIVE, 0);
4224         assert(err == 0);
4225 
4226         zc.zc_nvlist_src_size = nvsz;
4227         zc.zc_nvlist_src = (uintptr_t)nvbuf;
4228         zc.zc_perm_action = un;
4229 
4230         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
4231 
4232         if (zfs_ioctl(hdl, ZFS_IOC_SET_FSACL, &zc) != 0) {
4233                 (void) snprintf(errbuf, sizeof (errbuf),
4234                     dgettext(TEXT_DOMAIN, "cannot set permissions on '%s'"),
4235                     zc.zc_name);
4236                 switch (errno) {
4237                 case ENOTSUP:
4238                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4239                             "pool must be upgraded"));
4240                         err = zfs_error(hdl, EZFS_BADVERSION, errbuf);
4241                         break;
4242                 case EINVAL:
4243                         err = zfs_error(hdl, EZFS_BADTYPE, errbuf);
4244                         break;
4245                 case ENOENT:
4246                         err = zfs_error(hdl, EZFS_NOENT, errbuf);
4247                         break;
4248                 default:
4249                         err = zfs_standard_error_fmt(hdl, errno, errbuf);
4250                         break;
4251                 }
4252         }
4253 
4254         free(nvbuf);
4255 
4256         return (err);
4257 }
4258 
4259 int
4260 zfs_get_holds(zfs_handle_t *zhp, nvlist_t **nvl)
4261 {
4262         zfs_cmd_t zc = { 0 };
4263         libzfs_handle_t *hdl = zhp->zfs_hdl;
4264         int nvsz = 2048;
4265         void *nvbuf;
4266         int err = 0;
4267         char errbuf[ZFS_MAXNAMELEN+32];
4268 
4269         assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
4270 
4271 tryagain:
4272 
4273         nvbuf = malloc(nvsz);
4274         if (nvbuf == NULL) {
4275                 err = (zfs_error(hdl, EZFS_NOMEM, strerror(errno)));
4276                 goto out;
4277         }
4278 
4279         zc.zc_nvlist_dst_size = nvsz;
4280         zc.zc_nvlist_dst = (uintptr_t)nvbuf;
4281 
4282         (void) strlcpy(zc.zc_name, zhp->zfs_name, ZFS_MAXNAMELEN);
4283 
4284         if (zfs_ioctl(hdl, ZFS_IOC_GET_HOLDS, &zc) != 0) {
4285                 (void) snprintf(errbuf, sizeof (errbuf),
4286                     dgettext(TEXT_DOMAIN, "cannot get holds for '%s'"),
4287                     zc.zc_name);
4288                 switch (errno) {
4289                 case ENOMEM:
4290                         free(nvbuf);
4291                         nvsz = zc.zc_nvlist_dst_size;
4292                         goto tryagain;
4293 
4294                 case ENOTSUP:
4295                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4296                             "pool must be upgraded"));
4297                         err = zfs_error(hdl, EZFS_BADVERSION, errbuf);
4298                         break;
4299                 case EINVAL:
4300                         err = zfs_error(hdl, EZFS_BADTYPE, errbuf);
4301                         break;
4302                 case ENOENT:
4303                         err = zfs_error(hdl, EZFS_NOENT, errbuf);
4304                         break;
4305                 default:
4306                         err = zfs_standard_error_fmt(hdl, errno, errbuf);
4307                         break;
4308                 }
4309         } else {
4310                 /* success */
4311                 int rc = nvlist_unpack(nvbuf, zc.zc_nvlist_dst_size, nvl, 0);
4312                 if (rc) {
4313                         (void) snprintf(errbuf, sizeof (errbuf),
4314                             dgettext(TEXT_DOMAIN, "cannot get holds for '%s'"),
4315                             zc.zc_name);
4316                         err = zfs_standard_error_fmt(hdl, rc, errbuf);
4317                 }
4318         }
4319 
4320         free(nvbuf);
4321 out:
4322         return (err);
4323 }
4324 
4325 uint64_t
4326 zvol_volsize_to_reservation(uint64_t volsize, nvlist_t *props)
4327 {
4328         uint64_t numdb;
4329         uint64_t nblocks, volblocksize;
4330         int ncopies;
4331         char *strval;
4332 
4333         if (nvlist_lookup_string(props,
4334             zfs_prop_to_name(ZFS_PROP_COPIES), &strval) == 0)
4335                 ncopies = atoi(strval);
4336         else
4337                 ncopies = 1;
4338         if (nvlist_lookup_uint64(props,
4339             zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
4340             &volblocksize) != 0)
4341                 volblocksize = ZVOL_DEFAULT_BLOCKSIZE;
4342         nblocks = volsize/volblocksize;
4343         /* start with metadnode L0-L6 */
4344         numdb = 7;
4345         /* calculate number of indirects */
4346         while (nblocks > 1) {
4347                 nblocks += DNODES_PER_LEVEL - 1;
4348                 nblocks /= DNODES_PER_LEVEL;
4349                 numdb += nblocks;
4350         }
4351         numdb *= MIN(SPA_DVAS_PER_BP, ncopies + 1);
4352         volsize *= ncopies;
4353         /*
4354          * this is exactly DN_MAX_INDBLKSHIFT when metadata isn't
4355          * compressed, but in practice they compress down to about
4356          * 1100 bytes
4357          */
4358         numdb *= 1ULL << DN_MAX_INDBLKSHIFT;
4359         volsize += numdb;
4360         return (volsize);
4361 }