lib/libzfs/libzfs_dataset.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright (c) 2013 by Delphix. All rights reserved.
  25  * Copyright (c) 2012 DEY Storage Systems, Inc.  All rights reserved.
  26  * Copyright (c) 2012 Pawel Jakub Dawidek <pawel@dawidek.net>.
  27  * Copyright 2012 Nexenta Systems, Inc. All rights reserved.
  28  * Copyright (c) 2013 Martin Matuska. All rights reserved.
  29  * Copyright (c) 2013 Steven Hartland. All rights reserved.
  30  */
  31
  32 #include <ctype.h>
  33 #include <errno.h>
  34 #include <libintl.h>
  35 #include <math.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <strings.h>
  39 #include <unistd.h>
  40 #include <stddef.h>
  41 #include <zone.h>
  42 #include <fcntl.h>
  43 #include <sys/mntent.h>
  44 #include <sys/mount.h>
  45 #include <priv.h>
  46 #include <pwd.h>
  47 #include <grp.h>
  48 #include <stddef.h>
  49 #include <ucred.h>
  50 #ifdef HAVE_IDMAP
  51 #include <idmap.h>
  52 #include <aclutils.h>
  53 #include <directory.h>
  54 #endif /* HAVE_IDMAP */
  55
  56 #include <sys/dnode.h>
  57 #include <sys/spa.h>
  58 #include <sys/zap.h>
  59 #include <libzfs.h>
  60
  61 #include "zfs_namecheck.h"
  62 #include "zfs_prop.h"
  63 #include "libzfs_impl.h"
  64 #include "zfs_deleg.h"
  65
  66 static int zvol_create_link_common(libzfs_handle_t *, const char *, int);
  67 static int userquota_propname_decode(const char *propname, boolean_t zoned,
  68     zfs_userquota_prop_t *typep, char *domain, int domainlen, uint64_t *ridp);
  69
  70 /*
  71  * Given a single type (not a mask of types), return the type in a human
  72  * readable form.
  73  */
  74 const char *
  75 zfs_type_to_name(zfs_type_t type)
  76 {
  77         switch (type) {
  78         case ZFS_TYPE_FILESYSTEM:
  79                 return (dgettext(TEXT_DOMAIN, "filesystem"));
  80         case ZFS_TYPE_SNAPSHOT:
  81                 return (dgettext(TEXT_DOMAIN, "snapshot"));
  82         case ZFS_TYPE_VOLUME:
  83                 return (dgettext(TEXT_DOMAIN, "volume"));
  84         default:
  85                 break;
  86         }
  87
  88         return (NULL);
  89 }
  90
  91 /*
  92  * Validate a ZFS path.  This is used even before trying to open the dataset, to
  93  * provide a more meaningful error message.  We call zfs_error_aux() to
  94  * explain exactly why the name was not valid.
  95  */
  96 int
  97 zfs_validate_name(libzfs_handle_t *hdl, const char *path, int type,
  98     boolean_t modifying)
  99 {
 100         namecheck_err_t why;
 101         char what;
 102
 103         (void) zfs_prop_get_table();
 104         if (dataset_namecheck(path, &why, &what) != 0) {
 105                 if (hdl != NULL) {
 106                         switch (why) {
 107                         case NAME_ERR_TOOLONG:
 108                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 109                                     "name is too long"));
 110                                 break;
 111
 112                         case NAME_ERR_LEADING_SLASH:
 113                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 114                                     "leading slash in name"));
 115                                 break;
 116
 117                         case NAME_ERR_EMPTY_COMPONENT:
 118                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 119                                     "empty component in name"));
 120                                 break;
 121
 122                         case NAME_ERR_TRAILING_SLASH:
 123                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 124                                     "trailing slash in name"));
 125                                 break;
 126
 127                         case NAME_ERR_INVALCHAR:
 128                                 zfs_error_aux(hdl,
 129                                     dgettext(TEXT_DOMAIN, "invalid character "
 130                                     "'%c' in name"), what);
 131                                 break;
 132
 133                         case NAME_ERR_MULTIPLE_AT:
 134                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 135                                     "multiple '@' delimiters in name"));
 136                                 break;
 137
 138                         case NAME_ERR_NOLETTER:
 139                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 140                                     "pool doesn't begin with a letter"));
 141                                 break;
 142
 143                         case NAME_ERR_RESERVED:
 144                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 145                                     "name is reserved"));
 146                                 break;
 147
 148                         case NAME_ERR_DISKLIKE:
 149                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 150                                     "reserved disk name"));
 151                                 break;
 152                         default:
 153                                 break;
 154                         }
 155                 }
 156
 157                 return (0);
 158         }
 159
 160         if (!(type & ZFS_TYPE_SNAPSHOT) && strchr(path, '@') != NULL) {
 161                 if (hdl != NULL)
 162                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 163                             "snapshot delimiter '@' in filesystem name"));
 164                 return (0);
 165         }
 166
 167         if (type == ZFS_TYPE_SNAPSHOT && strchr(path, '@') == NULL) {
 168                 if (hdl != NULL)
 169                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 170                             "missing '@' delimiter in snapshot name"));
 171                 return (0);
 172         }
 173
 174         if (modifying && strchr(path, '%') != NULL) {
 175                 if (hdl != NULL)
 176                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 177                             "invalid character %c in name"), '%');
 178                 return (0);
 179         }
 180
 181         return (-1);
 182 }
 183
 184 int
 185 zfs_name_valid(const char *name, zfs_type_t type)
 186 {
 187         if (type == ZFS_TYPE_POOL)
 188                 return (zpool_name_valid(NULL, B_FALSE, name));
 189         return (zfs_validate_name(NULL, name, type, B_FALSE));
 190 }
 191
 192 /*
 193  * This function takes the raw DSL properties, and filters out the user-defined
 194  * properties into a separate nvlist.
 195  */
 196 static nvlist_t *
 197 process_user_props(zfs_handle_t *zhp, nvlist_t *props)
 198 {
 199         libzfs_handle_t *hdl = zhp->zfs_hdl;
 200         nvpair_t *elem;
 201         nvlist_t *propval;
 202         nvlist_t *nvl;
 203
 204         if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0) {
 205                 (void) no_memory(hdl);
 206                 return (NULL);
 207         }
 208
 209         elem = NULL;
 210         while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
 211                 if (!zfs_prop_user(nvpair_name(elem)))
 212                         continue;
 213
 214                 verify(nvpair_value_nvlist(elem, &propval) == 0);
 215                 if (nvlist_add_nvlist(nvl, nvpair_name(elem), propval) != 0) {
 216                         nvlist_free(nvl);
 217                         (void) no_memory(hdl);
 218                         return (NULL);
 219                 }
 220         }
 221
 222         return (nvl);
 223 }
 224
 225 static zpool_handle_t *
 226 zpool_add_handle(zfs_handle_t *zhp, const char *pool_name)
 227 {
 228         libzfs_handle_t *hdl = zhp->zfs_hdl;
 229         zpool_handle_t *zph;
 230
 231         if ((zph = zpool_open_canfail(hdl, pool_name)) != NULL) {
 232                 if (hdl->libzfs_pool_handles != NULL)
 233                         zph->zpool_next = hdl->libzfs_pool_handles;
 234                 hdl->libzfs_pool_handles = zph;
 235         }
 236         return (zph);
 237 }
 238
 239 static zpool_handle_t *
 240 zpool_find_handle(zfs_handle_t *zhp, const char *pool_name, int len)
 241 {
 242         libzfs_handle_t *hdl = zhp->zfs_hdl;
 243         zpool_handle_t *zph = hdl->libzfs_pool_handles;
 244
 245         while ((zph != NULL) &&
 246             (strncmp(pool_name, zpool_get_name(zph), len) != 0))
 247                 zph = zph->zpool_next;
 248         return (zph);
 249 }
 250
 251 /*
 252  * Returns a handle to the pool that contains the provided dataset.
 253  * If a handle to that pool already exists then that handle is returned.
 254  * Otherwise, a new handle is created and added to the list of handles.
 255  */
 256 static zpool_handle_t *
 257 zpool_handle(zfs_handle_t *zhp)
 258 {
 259         char *pool_name;
 260         int len;
 261         zpool_handle_t *zph;
 262
 263         len = strcspn(zhp->zfs_name, "/@") + 1;
 264         pool_name = zfs_alloc(zhp->zfs_hdl, len);
 265         (void) strlcpy(pool_name, zhp->zfs_name, len);
 266
 267         zph = zpool_find_handle(zhp, pool_name, len);
 268         if (zph == NULL)
 269                 zph = zpool_add_handle(zhp, pool_name);
 270
 271         free(pool_name);
 272         return (zph);
 273 }
 274
 275 void
 276 zpool_free_handles(libzfs_handle_t *hdl)
 277 {
 278         zpool_handle_t *next, *zph = hdl->libzfs_pool_handles;
 279
 280         while (zph != NULL) {
 281                 next = zph->zpool_next;
 282                 zpool_close(zph);
 283                 zph = next;
 284         }
 285         hdl->libzfs_pool_handles = NULL;
 286 }
 287
 288 /*
 289  * Utility function to gather stats (objset and zpl) for the given object.
 290  */
 291 static int
 292 get_stats_ioctl(zfs_handle_t *zhp, zfs_cmd_t *zc)
 293 {
 294         libzfs_handle_t *hdl = zhp->zfs_hdl;
 295
 296         (void) strlcpy(zc->zc_name, zhp->zfs_name, sizeof (zc->zc_name));
 297
 298         while (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, zc) != 0) {
 299                 if (errno == ENOMEM) {
 300                         if (zcmd_expand_dst_nvlist(hdl, zc) != 0) {
 301                                 return (-1);
 302                         }
 303                 } else {
 304                         return (-1);
 305                 }
 306         }
 307         return (0);
 308 }
 309
 310 /*
 311  * Utility function to get the received properties of the given object.
 312  */
 313 static int
 314 get_recvd_props_ioctl(zfs_handle_t *zhp)
 315 {
 316         libzfs_handle_t *hdl = zhp->zfs_hdl;
 317         nvlist_t *recvdprops;
 318         zfs_cmd_t zc = {"\0"};
 319         int err;
 320
 321         if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0)
 322                 return (-1);
 323
 324         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
 325
 326         while (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_RECVD_PROPS, &zc) != 0) {
 327                 if (errno == ENOMEM) {
 328                         if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
 329                                 return (-1);
 330                         }
 331                 } else {
 332                         zcmd_free_nvlists(&zc);
 333                         return (-1);
 334                 }
 335         }
 336
 337         err = zcmd_read_dst_nvlist(zhp->zfs_hdl, &zc, &recvdprops);
 338         zcmd_free_nvlists(&zc);
 339         if (err != 0)
 340                 return (-1);
 341
 342         nvlist_free(zhp->zfs_recvd_props);
 343         zhp->zfs_recvd_props = recvdprops;
 344
 345         return (0);
 346 }
 347
 348 static int
 349 put_stats_zhdl(zfs_handle_t *zhp, zfs_cmd_t *zc)
 350 {
 351         nvlist_t *allprops, *userprops;
 352
 353         zhp->zfs_dmustats = zc->zc_objset_stats; /* structure assignment */
 354
 355         if (zcmd_read_dst_nvlist(zhp->zfs_hdl, zc, &allprops) != 0) {
 356                 return (-1);
 357         }
 358
 359         /*
 360          * XXX Why do we store the user props separately, in addition to
 361          * storing them in zfs_props?
 362          */
 363         if ((userprops = process_user_props(zhp, allprops)) == NULL) {
 364                 nvlist_free(allprops);
 365                 return (-1);
 366         }
 367
 368         nvlist_free(zhp->zfs_props);
 369         nvlist_free(zhp->zfs_user_props);
 370
 371         zhp->zfs_props = allprops;
 372         zhp->zfs_user_props = userprops;
 373
 374         return (0);
 375 }
 376
 377 static int
 378 get_stats(zfs_handle_t *zhp)
 379 {
 380         int rc = 0;
 381         zfs_cmd_t zc = {"\0"};
 382
 383         if (zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
 384                 return (-1);
 385         if (get_stats_ioctl(zhp, &zc) != 0)
 386                 rc = -1;
 387         else if (put_stats_zhdl(zhp, &zc) != 0)
 388                 rc = -1;
 389         zcmd_free_nvlists(&zc);
 390         return (rc);
 391 }
 392
 393 /*
 394  * Refresh the properties currently stored in the handle.
 395  */
 396 void
 397 zfs_refresh_properties(zfs_handle_t *zhp)
 398 {
 399         (void) get_stats(zhp);
 400 }
 401
 402 /*
 403  * Makes a handle from the given dataset name.  Used by zfs_open() and
 404  * zfs_iter_* to create child handles on the fly.
 405  */
 406 static int
 407 make_dataset_handle_common(zfs_handle_t *zhp, zfs_cmd_t *zc)
 408 {
 409         if (put_stats_zhdl(zhp, zc) != 0)
 410                 return (-1);
 411
 412         /*
 413          * We've managed to open the dataset and gather statistics.  Determine
 414          * the high-level type.
 415          */
 416         if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
 417                 zhp->zfs_head_type = ZFS_TYPE_VOLUME;
 418         else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
 419                 zhp->zfs_head_type = ZFS_TYPE_FILESYSTEM;
 420         else if (zhp->zfs_dmustats.dds_type == DMU_OST_OTHER)
 421                 return (-1); /* zpios' and other testing datasets are
 422                                 of this type, ignore if encountered */
 423         else
 424                 abort();
 425
 426         if (zhp->zfs_dmustats.dds_is_snapshot)
 427                 zhp->zfs_type = ZFS_TYPE_SNAPSHOT;
 428         else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
 429                 zhp->zfs_type = ZFS_TYPE_VOLUME;
 430         else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
 431                 zhp->zfs_type = ZFS_TYPE_FILESYSTEM;
 432         else
 433                 abort();        /* we should never see any other types */
 434
 435         if ((zhp->zpool_hdl = zpool_handle(zhp)) == NULL)
 436                 return (-1);
 437
 438         return (0);
 439 }
 440
 441 zfs_handle_t *
 442 make_dataset_handle(libzfs_handle_t *hdl, const char *path)
 443 {
 444         zfs_cmd_t zc = {"\0"};
 445
 446         zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
 447
 448         if (zhp == NULL)
 449                 return (NULL);
 450
 451         zhp->zfs_hdl = hdl;
 452         (void) strlcpy(zhp->zfs_name, path, sizeof (zhp->zfs_name));
 453         if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0) {
 454                 free(zhp);
 455                 return (NULL);
 456         }
 457         if (get_stats_ioctl(zhp, &zc) == -1) {
 458                 zcmd_free_nvlists(&zc);
 459                 free(zhp);
 460                 return (NULL);
 461         }
 462         if (make_dataset_handle_common(zhp, &zc) == -1) {
 463                 free(zhp);
 464                 zhp = NULL;
 465         }
 466         zcmd_free_nvlists(&zc);
 467         return (zhp);
 468 }
 469
 470 zfs_handle_t *
 471 make_dataset_handle_zc(libzfs_handle_t *hdl, zfs_cmd_t *zc)
 472 {
 473         zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
 474
 475         if (zhp == NULL)
 476                 return (NULL);
 477
 478         zhp->zfs_hdl = hdl;
 479         (void) strlcpy(zhp->zfs_name, zc->zc_name, sizeof (zhp->zfs_name));
 480         if (make_dataset_handle_common(zhp, zc) == -1) {
 481                 free(zhp);
 482                 return (NULL);
 483         }
 484         return (zhp);
 485 }
 486
 487 zfs_handle_t *
 488 make_dataset_simple_handle_zc(zfs_handle_t *pzhp, zfs_cmd_t *zc)
 489 {
 490         zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
 491
 492         if (zhp == NULL)
 493                 return (NULL);
 494
 495         zhp->zfs_hdl = pzhp->zfs_hdl;
 496         (void) strlcpy(zhp->zfs_name, zc->zc_name, sizeof (zhp->zfs_name));
 497         zhp->zfs_head_type = pzhp->zfs_type;
 498         zhp->zfs_type = ZFS_TYPE_SNAPSHOT;
 499         zhp->zpool_hdl = zpool_handle(zhp);
 500
 501         return (zhp);
 502 }
 503
 504 zfs_handle_t *
 505 zfs_handle_dup(zfs_handle_t *zhp_orig)
 506 {
 507         zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
 508
 509         if (zhp == NULL)
 510                 return (NULL);
 511
 512         zhp->zfs_hdl = zhp_orig->zfs_hdl;
 513         zhp->zpool_hdl = zhp_orig->zpool_hdl;
 514         (void) strlcpy(zhp->zfs_name, zhp_orig->zfs_name,
 515             sizeof (zhp->zfs_name));
 516         zhp->zfs_type = zhp_orig->zfs_type;
 517         zhp->zfs_head_type = zhp_orig->zfs_head_type;
 518         zhp->zfs_dmustats = zhp_orig->zfs_dmustats;
 519         if (zhp_orig->zfs_props != NULL) {
 520                 if (nvlist_dup(zhp_orig->zfs_props, &zhp->zfs_props, 0) != 0) {
 521                         (void) no_memory(zhp->zfs_hdl);
 522                         zfs_close(zhp);
 523                         return (NULL);
 524                 }
 525         }
 526         if (zhp_orig->zfs_user_props != NULL) {
 527                 if (nvlist_dup(zhp_orig->zfs_user_props,
 528                     &zhp->zfs_user_props, 0) != 0) {
 529                         (void) no_memory(zhp->zfs_hdl);
 530                         zfs_close(zhp);
 531                         return (NULL);
 532                 }
 533         }
 534         if (zhp_orig->zfs_recvd_props != NULL) {
 535                 if (nvlist_dup(zhp_orig->zfs_recvd_props,
 536                     &zhp->zfs_recvd_props, 0)) {
 537                         (void) no_memory(zhp->zfs_hdl);
 538                         zfs_close(zhp);
 539                         return (NULL);
 540                 }
 541         }
 542         zhp->zfs_mntcheck = zhp_orig->zfs_mntcheck;
 543         if (zhp_orig->zfs_mntopts != NULL) {
 544                 zhp->zfs_mntopts = zfs_strdup(zhp_orig->zfs_hdl,
 545                     zhp_orig->zfs_mntopts);
 546         }
 547         zhp->zfs_props_table = zhp_orig->zfs_props_table;
 548         return (zhp);
 549 }
 550
 551 /*
 552  * Opens the given snapshot, filesystem, or volume.   The 'types'
 553  * argument is a mask of acceptable types.  The function will print an
 554  * appropriate error message and return NULL if it can't be opened.
 555  */
 556 zfs_handle_t *
 557 zfs_open(libzfs_handle_t *hdl, const char *path, int types)
 558 {
 559         zfs_handle_t *zhp;
 560         char errbuf[1024];
 561
 562         (void) snprintf(errbuf, sizeof (errbuf),
 563             dgettext(TEXT_DOMAIN, "cannot open '%s'"), path);
 564
 565         /*
 566          * Validate the name before we even try to open it.
 567          */
 568         if (!zfs_validate_name(hdl, path, ZFS_TYPE_DATASET, B_FALSE)) {
 569                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 570                     "invalid dataset name"));
 571                 (void) zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
 572                 return (NULL);
 573         }
 574
 575         /*
 576          * Try to get stats for the dataset, which will tell us if it exists.
 577          */
 578         errno = 0;
 579         if ((zhp = make_dataset_handle(hdl, path)) == NULL) {
 580                 (void) zfs_standard_error(hdl, errno, errbuf);
 581                 return (NULL);
 582         }
 583
 584         if (!(types & zhp->zfs_type)) {
 585                 (void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
 586                 zfs_close(zhp);
 587                 return (NULL);
 588         }
 589
 590         return (zhp);
 591 }
 592
 593 /*
 594  * Release a ZFS handle.  Nothing to do but free the associated memory.
 595  */
 596 void
 597 zfs_close(zfs_handle_t *zhp)
 598 {
 599         if (zhp->zfs_mntopts)
 600                 free(zhp->zfs_mntopts);
 601         nvlist_free(zhp->zfs_props);
 602         nvlist_free(zhp->zfs_user_props);
 603         nvlist_free(zhp->zfs_recvd_props);
 604         free(zhp);
 605 }
 606
 607 typedef struct mnttab_node {
 608         struct mnttab mtn_mt;
 609         avl_node_t mtn_node;
 610 } mnttab_node_t;
 611
 612 static int
 613 libzfs_mnttab_cache_compare(const void *arg1, const void *arg2)
 614 {
 615         const mnttab_node_t *mtn1 = arg1;
 616         const mnttab_node_t *mtn2 = arg2;
 617         int rv;
 618
 619         rv = strcmp(mtn1->mtn_mt.mnt_special, mtn2->mtn_mt.mnt_special);
 620
 621         if (rv == 0)
 622                 return (0);
 623         return (rv > 0 ? 1 : -1);
 624 }
 625
 626 void
 627 libzfs_mnttab_init(libzfs_handle_t *hdl)
 628 {
 629         assert(avl_numnodes(&hdl->libzfs_mnttab_cache) == 0);
 630         avl_create(&hdl->libzfs_mnttab_cache, libzfs_mnttab_cache_compare,
 631             sizeof (mnttab_node_t), offsetof(mnttab_node_t, mtn_node));
 632 }
 633
 634 int
 635 libzfs_mnttab_update(libzfs_handle_t *hdl)
 636 {
 637         struct mnttab entry;
 638
 639         /* Reopen MNTTAB to prevent reading stale data from open file */
 640         if (freopen(MNTTAB, "r", hdl->libzfs_mnttab) == NULL)
 641                 return (ENOENT);
 642
 643         while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
 644                 mnttab_node_t *mtn;
 645
 646                 if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
 647                         continue;
 648                 mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
 649                 mtn->mtn_mt.mnt_special = zfs_strdup(hdl, entry.mnt_special);
 650                 mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, entry.mnt_mountp);
 651                 mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, entry.mnt_fstype);
 652                 mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, entry.mnt_mntopts);
 653                 avl_add(&hdl->libzfs_mnttab_cache, mtn);
 654         }
 655
 656         return (0);
 657 }
 658
 659 void
 660 libzfs_mnttab_fini(libzfs_handle_t *hdl)
 661 {
 662         void *cookie = NULL;
 663         mnttab_node_t *mtn;
 664
 665         while ((mtn = avl_destroy_nodes(&hdl->libzfs_mnttab_cache, &cookie))) {
 666                 free(mtn->mtn_mt.mnt_special);
 667                 free(mtn->mtn_mt.mnt_mountp);
 668                 free(mtn->mtn_mt.mnt_fstype);
 669                 free(mtn->mtn_mt.mnt_mntopts);
 670                 free(mtn);
 671         }
 672         avl_destroy(&hdl->libzfs_mnttab_cache);
 673 }
 674
 675 void
 676 libzfs_mnttab_cache(libzfs_handle_t *hdl, boolean_t enable)
 677 {
 678         hdl->libzfs_mnttab_enable = enable;
 679 }
 680
 681 int
 682 libzfs_mnttab_find(libzfs_handle_t *hdl, const char *fsname,
 683     struct mnttab *entry)
 684 {
 685         mnttab_node_t find;
 686         mnttab_node_t *mtn;
 687         int error;
 688
 689         if (!hdl->libzfs_mnttab_enable) {
 690                 struct mnttab srch = { 0 };
 691
 692                 if (avl_numnodes(&hdl->libzfs_mnttab_cache))
 693                         libzfs_mnttab_fini(hdl);
 694
 695                 /* Reopen MNTTAB to prevent reading stale data from open file */
 696                 if (freopen(MNTTAB, "r", hdl->libzfs_mnttab) == NULL)
 697                         return (ENOENT);
 698
 699                 srch.mnt_special = (char *)fsname;
 700                 srch.mnt_fstype = MNTTYPE_ZFS;
 701                 if (getmntany(hdl->libzfs_mnttab, entry, &srch) == 0)
 702                         return (0);
 703                 else
 704                         return (ENOENT);
 705         }
 706
 707         if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0)
 708                 if ((error = libzfs_mnttab_update(hdl)) != 0)
 709                         return (error);
 710
 711         find.mtn_mt.mnt_special = (char *)fsname;
 712         mtn = avl_find(&hdl->libzfs_mnttab_cache, &find, NULL);
 713         if (mtn) {
 714                 *entry = mtn->mtn_mt;
 715                 return (0);
 716         }
 717         return (ENOENT);
 718 }
 719
 720 void
 721 libzfs_mnttab_add(libzfs_handle_t *hdl, const char *special,
 722     const char *mountp, const char *mntopts)
 723 {
 724         mnttab_node_t *mtn;
 725
 726         if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0)
 727                 return;
 728         mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
 729         mtn->mtn_mt.mnt_special = zfs_strdup(hdl, special);
 730         mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, mountp);
 731         mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, MNTTYPE_ZFS);
 732         mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, mntopts);
 733         avl_add(&hdl->libzfs_mnttab_cache, mtn);
 734 }
 735
 736 void
 737 libzfs_mnttab_remove(libzfs_handle_t *hdl, const char *fsname)
 738 {
 739         mnttab_node_t find;
 740         mnttab_node_t *ret;
 741
 742         find.mtn_mt.mnt_special = (char *)fsname;
 743         if ((ret = avl_find(&hdl->libzfs_mnttab_cache, (void *)&find, NULL))) {
 744                 avl_remove(&hdl->libzfs_mnttab_cache, ret);
 745                 free(ret->mtn_mt.mnt_special);
 746                 free(ret->mtn_mt.mnt_mountp);
 747                 free(ret->mtn_mt.mnt_fstype);
 748                 free(ret->mtn_mt.mnt_mntopts);
 749                 free(ret);
 750         }
 751 }
 752
 753 int
 754 zfs_spa_version(zfs_handle_t *zhp, int *spa_version)
 755 {
 756         zpool_handle_t *zpool_handle = zhp->zpool_hdl;
 757
 758         if (zpool_handle == NULL)
 759                 return (-1);
 760
 761         *spa_version = zpool_get_prop_int(zpool_handle,
 762             ZPOOL_PROP_VERSION, NULL);
 763         return (0);
 764 }
 765
 766 /*
 767  * The choice of reservation property depends on the SPA version.
 768  */
 769 static int
 770 zfs_which_resv_prop(zfs_handle_t *zhp, zfs_prop_t *resv_prop)
 771 {
 772         int spa_version;
 773
 774         if (zfs_spa_version(zhp, &spa_version) < 0)
 775                 return (-1);
 776
 777         if (spa_version >= SPA_VERSION_REFRESERVATION)
 778                 *resv_prop = ZFS_PROP_REFRESERVATION;
 779         else
 780                 *resv_prop = ZFS_PROP_RESERVATION;
 781
 782         return (0);
 783 }
 784
 785 /*
 786  * Given an nvlist of properties to set, validates that they are correct, and
 787  * parses any numeric properties (index, boolean, etc) if they are specified as
 788  * strings.
 789  */
 790 nvlist_t *
 791 zfs_valid_proplist(libzfs_handle_t *hdl, zfs_type_t type, nvlist_t *nvl,
 792     uint64_t zoned, zfs_handle_t *zhp, const char *errbuf)
 793 {
 794         nvpair_t *elem;
 795         uint64_t intval;
 796         char *strval;
 797         zfs_prop_t prop;
 798         nvlist_t *ret;
 799         int chosen_normal = -1;
 800         int chosen_utf = -1;
 801
 802         if (nvlist_alloc(&ret, NV_UNIQUE_NAME, 0) != 0) {
 803                 (void) no_memory(hdl);
 804                 return (NULL);
 805         }
 806
 807         /*
 808          * Make sure this property is valid and applies to this type.
 809          */
 810
 811         elem = NULL;
 812         while ((elem = nvlist_next_nvpair(nvl, elem)) != NULL) {
 813                 const char *propname = nvpair_name(elem);
 814
 815                 prop = zfs_name_to_prop(propname);
 816                 if (prop == ZPROP_INVAL && zfs_prop_user(propname)) {
 817                         /*
 818                          * This is a user property: make sure it's a
 819                          * string, and that it's less than ZAP_MAXNAMELEN.
 820                          */
 821                         if (nvpair_type(elem) != DATA_TYPE_STRING) {
 822                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 823                                     "'%s' must be a string"), propname);
 824                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 825                                 goto error;
 826                         }
 827
 828                         if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
 829                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 830                                     "property name '%s' is too long"),
 831                                     propname);
 832                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 833                                 goto error;
 834                         }
 835
 836                         (void) nvpair_value_string(elem, &strval);
 837                         if (nvlist_add_string(ret, propname, strval) != 0) {
 838                                 (void) no_memory(hdl);
 839                                 goto error;
 840                         }
 841                         continue;
 842                 }
 843
 844                 /*
 845                  * Currently, only user properties can be modified on
 846                  * snapshots.
 847                  */
 848                 if (type == ZFS_TYPE_SNAPSHOT) {
 849                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 850                             "this property can not be modified for snapshots"));
 851                         (void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
 852                         goto error;
 853                 }
 854
 855                 if (prop == ZPROP_INVAL && zfs_prop_userquota(propname)) {
 856                         zfs_userquota_prop_t uqtype;
 857                         char newpropname[128];
 858                         char domain[128];
 859                         uint64_t rid;
 860                         uint64_t valary[3];
 861
 862                         if (userquota_propname_decode(propname, zoned,
 863                             &uqtype, domain, sizeof (domain), &rid) != 0) {
 864                                 zfs_error_aux(hdl,
 865                                     dgettext(TEXT_DOMAIN,
 866                                     "'%s' has an invalid user/group name"),
 867                                     propname);
 868                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 869                                 goto error;
 870                         }
 871
 872                         if (uqtype != ZFS_PROP_USERQUOTA &&
 873                             uqtype != ZFS_PROP_GROUPQUOTA) {
 874                                 zfs_error_aux(hdl,
 875                                     dgettext(TEXT_DOMAIN, "'%s' is readonly"),
 876                                     propname);
 877                                 (void) zfs_error(hdl, EZFS_PROPREADONLY,
 878                                     errbuf);
 879                                 goto error;
 880                         }
 881
 882                         if (nvpair_type(elem) == DATA_TYPE_STRING) {
 883                                 (void) nvpair_value_string(elem, &strval);
 884                                 if (strcmp(strval, "none") == 0) {
 885                                         intval = 0;
 886                                 } else if (zfs_nicestrtonum(hdl,
 887                                     strval, &intval) != 0) {
 888                                         (void) zfs_error(hdl,
 889                                             EZFS_BADPROP, errbuf);
 890                                         goto error;
 891                                 }
 892                         } else if (nvpair_type(elem) ==
 893                             DATA_TYPE_UINT64) {
 894                                 (void) nvpair_value_uint64(elem, &intval);
 895                                 if (intval == 0) {
 896                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 897                                             "use 'none' to disable "
 898                                             "userquota/groupquota"));
 899                                         goto error;
 900                                 }
 901                         } else {
 902                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 903                                     "'%s' must be a number"), propname);
 904                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 905                                 goto error;
 906                         }
 907
 908                         /*
 909                          * Encode the prop name as
 910                          * userquota@<hex-rid>-domain, to make it easy
 911                          * for the kernel to decode.
 912                          */
 913                         (void) snprintf(newpropname, sizeof (newpropname),
 914                             "%s%llx-%s", zfs_userquota_prop_prefixes[uqtype],
 915                             (longlong_t)rid, domain);
 916                         valary[0] = uqtype;
 917                         valary[1] = rid;
 918                         valary[2] = intval;
 919                         if (nvlist_add_uint64_array(ret, newpropname,
 920                             valary, 3) != 0) {
 921                                 (void) no_memory(hdl);
 922                                 goto error;
 923                         }
 924                         continue;
 925                 } else if (prop == ZPROP_INVAL && zfs_prop_written(propname)) {
 926                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 927                             "'%s' is readonly"),
 928                             propname);
 929                         (void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
 930                         goto error;
 931                 }
 932
 933                 if (prop == ZPROP_INVAL) {
 934                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 935                             "invalid property '%s'"), propname);
 936                         (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 937                         goto error;
 938                 }
 939
 940                 if (!zfs_prop_valid_for_type(prop, type)) {
 941                         zfs_error_aux(hdl,
 942                             dgettext(TEXT_DOMAIN, "'%s' does not "
 943                             "apply to datasets of this type"), propname);
 944                         (void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
 945                         goto error;
 946                 }
 947
 948                 if (zfs_prop_readonly(prop) &&
 949                     (!zfs_prop_setonce(prop) || zhp != NULL)) {
 950                         zfs_error_aux(hdl,
 951                             dgettext(TEXT_DOMAIN, "'%s' is readonly"),
 952                             propname);
 953                         (void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
 954                         goto error;
 955                 }
 956
 957                 if (zprop_parse_value(hdl, elem, prop, type, ret,
 958                     &strval, &intval, errbuf) != 0)
 959                         goto error;
 960
 961                 /*
 962                  * Perform some additional checks for specific properties.
 963                  */
 964                 switch (prop) {
 965                 case ZFS_PROP_VERSION:
 966                 {
 967                         int version;
 968
 969                         if (zhp == NULL)
 970                                 break;
 971                         version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
 972                         if (intval < version) {
 973                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 974                                     "Can not downgrade; already at version %u"),
 975                                     version);
 976                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 977                                 goto error;
 978                         }
 979                         break;
 980                 }
 981
 982                 case ZFS_PROP_RECORDSIZE:
 983                 case ZFS_PROP_VOLBLOCKSIZE:
 984                         /* must be power of two within SPA_{MIN,MAX}BLOCKSIZE */
 985                         if (intval < SPA_MINBLOCKSIZE ||
 986                             intval > SPA_MAXBLOCKSIZE || !ISP2(intval)) {
 987                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 988                                     "'%s' must be power of 2 from %u "
 989                                     "to %uk"), propname,
 990                                     (uint_t)SPA_MINBLOCKSIZE,
 991                                     (uint_t)SPA_MAXBLOCKSIZE >> 10);
 992                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
 993                                 goto error;
 994                         }
 995                         break;
 996
 997                 case ZFS_PROP_MLSLABEL:
 998                 {
 999 #ifdef HAVE_MLSLABEL
1000                         /*
1001                          * Verify the mlslabel string and convert to
1002                          * internal hex label string.
1003                          */
1004
1005                         m_label_t *new_sl;
1006                         char *hex = NULL;       /* internal label string */
1007
1008                         /* Default value is already OK. */
1009                         if (strcasecmp(strval, ZFS_MLSLABEL_DEFAULT) == 0)
1010                                 break;
1011
1012                         /* Verify the label can be converted to binary form */
1013                         if (((new_sl = m_label_alloc(MAC_LABEL)) == NULL) ||
1014                             (str_to_label(strval, &new_sl, MAC_LABEL,
1015                             L_NO_CORRECTION, NULL) == -1)) {
1016                                 goto badlabel;
1017                         }
1018
1019                         /* Now translate to hex internal label string */
1020                         if (label_to_str(new_sl, &hex, M_INTERNAL,
1021                             DEF_NAMES) != 0) {
1022                                 if (hex)
1023                                         free(hex);
1024                                 goto badlabel;
1025                         }
1026                         m_label_free(new_sl);
1027
1028                         /* If string is already in internal form, we're done. */
1029                         if (strcmp(strval, hex) == 0) {
1030                                 free(hex);
1031                                 break;
1032                         }
1033
1034                         /* Replace the label string with the internal form. */
1035                         (void) nvlist_remove(ret, zfs_prop_to_name(prop),
1036                             DATA_TYPE_STRING);
1037                         verify(nvlist_add_string(ret, zfs_prop_to_name(prop),
1038                             hex) == 0);
1039                         free(hex);
1040
1041                         break;
1042
1043 badlabel:
1044                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1045                             "invalid mlslabel '%s'"), strval);
1046                         (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1047                         m_label_free(new_sl);   /* OK if null */
1048                         goto error;
1049 #else
1050                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1051                             "mlslabels are unsupported"));
1052                         (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1053                         goto error;
1054 #endif /* HAVE_MLSLABEL */
1055                 }
1056
1057                 case ZFS_PROP_MOUNTPOINT:
1058                 {
1059                         namecheck_err_t why;
1060
1061                         if (strcmp(strval, ZFS_MOUNTPOINT_NONE) == 0 ||
1062                             strcmp(strval, ZFS_MOUNTPOINT_LEGACY) == 0)
1063                                 break;
1064
1065                         if (mountpoint_namecheck(strval, &why)) {
1066                                 switch (why) {
1067                                 case NAME_ERR_LEADING_SLASH:
1068                                         zfs_error_aux(hdl,
1069                                             dgettext(TEXT_DOMAIN,
1070                                             "'%s' must be an absolute path, "
1071                                             "'none', or 'legacy'"), propname);
1072                                         break;
1073                                 case NAME_ERR_TOOLONG:
1074                                         zfs_error_aux(hdl,
1075                                             dgettext(TEXT_DOMAIN,
1076                                             "component of '%s' is too long"),
1077                                             propname);
1078                                         break;
1079                                 default:
1080                                         break;
1081                                 }
1082                                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1083                                 goto error;
1084                         }
1085                 }
1086
1087                         /*FALLTHRU*/
1088
1089                 case ZFS_PROP_SHARESMB:
1090                 case ZFS_PROP_SHARENFS:
1091                         /*
1092                          * For the mountpoint and sharenfs or sharesmb
1093                          * properties, check if it can be set in a
1094                          * global/non-global zone based on
1095                          * the zoned property value:
1096                          *
1097                          *              global zone         non-global zone
1098                          * --------------------------------------------------
1099                          * zoned=on     mountpoint (no)     mountpoint (yes)
1100                          *              sharenfs (no)       sharenfs (no)
1101                          *              sharesmb (no)       sharesmb (no)
1102                          *
1103                          * zoned=off    mountpoint (yes)        N/A
1104                          *              sharenfs (yes)
1105                          *              sharesmb (yes)
1106                          */
1107                         if (zoned) {
1108                                 if (getzoneid() == GLOBAL_ZONEID) {
1109                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1110                                             "'%s' cannot be set on "
1111                                             "dataset in a non-global zone"),
1112                                             propname);
1113                                         (void) zfs_error(hdl, EZFS_ZONED,
1114                                             errbuf);
1115                                         goto error;
1116                                 } else if (prop == ZFS_PROP_SHARENFS ||
1117                                     prop == ZFS_PROP_SHARESMB) {
1118                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1119                                             "'%s' cannot be set in "
1120                                             "a non-global zone"), propname);
1121                                         (void) zfs_error(hdl, EZFS_ZONED,
1122                                             errbuf);
1123                                         goto error;
1124                                 }
1125                         } else if (getzoneid() != GLOBAL_ZONEID) {
1126                                 /*
1127                                  * If zoned property is 'off', this must be in
1128                                  * a global zone. If not, something is wrong.
1129                                  */
1130                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1131                                     "'%s' cannot be set while dataset "
1132                                     "'zoned' property is set"), propname);
1133                                 (void) zfs_error(hdl, EZFS_ZONED, errbuf);
1134                                 goto error;
1135                         }
1136
1137                         /*
1138                          * At this point, it is legitimate to set the
1139                          * property. Now we want to make sure that the
1140                          * property value is valid if it is sharenfs.
1141                          */
1142                         if ((prop == ZFS_PROP_SHARENFS ||
1143                             prop == ZFS_PROP_SHARESMB) &&
1144                             strcmp(strval, "on") != 0 &&
1145                             strcmp(strval, "off") != 0) {
1146                                 zfs_share_proto_t proto;
1147
1148                                 if (prop == ZFS_PROP_SHARESMB)
1149                                         proto = PROTO_SMB;
1150                                 else
1151                                         proto = PROTO_NFS;
1152
1153                                 /*
1154                                  * Must be an valid sharing protocol
1155                                  * option string so init the libshare
1156                                  * in order to enable the parser and
1157                                  * then parse the options. We use the
1158                                  * control API since we don't care about
1159                                  * the current configuration and don't
1160                                  * want the overhead of loading it
1161                                  * until we actually do something.
1162                                  */
1163
1164                                 if (zfs_init_libshare(hdl,
1165                                     SA_INIT_CONTROL_API) != SA_OK) {
1166                                         /*
1167                                          * An error occurred so we can't do
1168                                          * anything
1169                                          */
1170                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1171                                             "'%s' cannot be set: problem "
1172                                             "in share initialization"),
1173                                             propname);
1174                                         (void) zfs_error(hdl, EZFS_BADPROP,
1175                                             errbuf);
1176                                         goto error;
1177                                 }
1178
1179                                 if (zfs_parse_options(strval, proto) != SA_OK) {
1180                                         /*
1181                                          * There was an error in parsing so
1182                                          * deal with it by issuing an error
1183                                          * message and leaving after
1184                                          * uninitializing the the libshare
1185                                          * interface.
1186                                          */
1187                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1188                                             "'%s' cannot be set to invalid "
1189                                             "options"), propname);
1190                                         (void) zfs_error(hdl, EZFS_BADPROP,
1191                                             errbuf);
1192                                         zfs_uninit_libshare(hdl);
1193                                         goto error;
1194                                 }
1195                                 zfs_uninit_libshare(hdl);
1196                         }
1197
1198                         break;
1199                 case ZFS_PROP_UTF8ONLY:
1200                         chosen_utf = (int)intval;
1201                         break;
1202                 case ZFS_PROP_NORMALIZE:
1203                         chosen_normal = (int)intval;
1204                         break;
1205                 default:
1206                         break;
1207                 }
1208
1209                 /*
1210                  * For changes to existing volumes, we have some additional
1211                  * checks to enforce.
1212                  */
1213                 if (type == ZFS_TYPE_VOLUME && zhp != NULL) {
1214                         uint64_t volsize = zfs_prop_get_int(zhp,
1215                             ZFS_PROP_VOLSIZE);
1216                         uint64_t blocksize = zfs_prop_get_int(zhp,
1217                             ZFS_PROP_VOLBLOCKSIZE);
1218                         char buf[64];
1219
1220                         switch (prop) {
1221                         case ZFS_PROP_RESERVATION:
1222                         case ZFS_PROP_REFRESERVATION:
1223                                 if (intval > volsize) {
1224                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1225                                             "'%s' is greater than current "
1226                                             "volume size"), propname);
1227                                         (void) zfs_error(hdl, EZFS_BADPROP,
1228                                             errbuf);
1229                                         goto error;
1230                                 }
1231                                 break;
1232
1233                         case ZFS_PROP_VOLSIZE:
1234                                 if (intval % blocksize != 0) {
1235                                         zfs_nicenum(blocksize, buf,
1236                                             sizeof (buf));
1237                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1238                                             "'%s' must be a multiple of "
1239                                             "volume block size (%s)"),
1240                                             propname, buf);
1241                                         (void) zfs_error(hdl, EZFS_BADPROP,
1242                                             errbuf);
1243                                         goto error;
1244                                 }
1245
1246                                 if (intval == 0) {
1247                                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1248                                             "'%s' cannot be zero"),
1249                                             propname);
1250                                         (void) zfs_error(hdl, EZFS_BADPROP,
1251                                             errbuf);
1252                                         goto error;
1253                                 }
1254                                 break;
1255                         default:
1256                                 break;
1257                         }
1258                 }
1259         }
1260
1261         /*
1262          * If normalization was chosen, but no UTF8 choice was made,
1263          * enforce rejection of non-UTF8 names.
1264          *
1265          * If normalization was chosen, but rejecting non-UTF8 names
1266          * was explicitly not chosen, it is an error.
1267          */
1268         if (chosen_normal > 0 && chosen_utf < 0) {
1269                 if (nvlist_add_uint64(ret,
1270                     zfs_prop_to_name(ZFS_PROP_UTF8ONLY), 1) != 0) {
1271                         (void) no_memory(hdl);
1272                         goto error;
1273                 }
1274         } else if (chosen_normal > 0 && chosen_utf == 0) {
1275                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1276                     "'%s' must be set 'on' if normalization chosen"),
1277                     zfs_prop_to_name(ZFS_PROP_UTF8ONLY));
1278                 (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1279                 goto error;
1280         }
1281         return (ret);
1282
1283 error:
1284         nvlist_free(ret);
1285         return (NULL);
1286 }
1287
1288 int
1289 zfs_add_synthetic_resv(zfs_handle_t *zhp, nvlist_t *nvl)
1290 {
1291         uint64_t old_volsize;
1292         uint64_t new_volsize;
1293         uint64_t old_reservation;
1294         uint64_t new_reservation;
1295         zfs_prop_t resv_prop;
1296
1297         /*
1298          * If this is an existing volume, and someone is setting the volsize,
1299          * make sure that it matches the reservation, or add it if necessary.
1300          */
1301         old_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
1302         if (zfs_which_resv_prop(zhp, &resv_prop) < 0)
1303                 return (-1);
1304         old_reservation = zfs_prop_get_int(zhp, resv_prop);
1305         if ((zvol_volsize_to_reservation(old_volsize, zhp->zfs_props) !=
1306             old_reservation) || nvlist_lookup_uint64(nvl,
1307             zfs_prop_to_name(resv_prop), &new_reservation) != ENOENT) {
1308                 return (0);
1309         }
1310         if (nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_VOLSIZE),
1311             &new_volsize) != 0)
1312                 return (-1);
1313         new_reservation = zvol_volsize_to_reservation(new_volsize,
1314             zhp->zfs_props);
1315         if (nvlist_add_uint64(nvl, zfs_prop_to_name(resv_prop),
1316             new_reservation) != 0) {
1317                 (void) no_memory(zhp->zfs_hdl);
1318                 return (-1);
1319         }
1320         return (1);
1321 }
1322
1323 void
1324 zfs_setprop_error(libzfs_handle_t *hdl, zfs_prop_t prop, int err,
1325     char *errbuf)
1326 {
1327         switch (err) {
1328
1329         case ENOSPC:
1330                 /*
1331                  * For quotas and reservations, ENOSPC indicates
1332                  * something different; setting a quota or reservation
1333                  * doesn't use any disk space.
1334                  */
1335                 switch (prop) {
1336                 case ZFS_PROP_QUOTA:
1337                 case ZFS_PROP_REFQUOTA:
1338                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1339                             "size is less than current used or "
1340                             "reserved space"));
1341                         (void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
1342                         break;
1343
1344                 case ZFS_PROP_RESERVATION:
1345                 case ZFS_PROP_REFRESERVATION:
1346                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1347                             "size is greater than available space"));
1348                         (void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
1349                         break;
1350
1351                 default:
1352                         (void) zfs_standard_error(hdl, err, errbuf);
1353                         break;
1354                 }
1355                 break;
1356
1357         case EBUSY:
1358                 (void) zfs_standard_error(hdl, EBUSY, errbuf);
1359                 break;
1360
1361         case EROFS:
1362                 (void) zfs_error(hdl, EZFS_DSREADONLY, errbuf);
1363                 break;
1364
1365         case ENOTSUP:
1366                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1367                     "pool and or dataset must be upgraded to set this "
1368                     "property or value"));
1369                 (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
1370                 break;
1371
1372         case ERANGE:
1373                 if (prop == ZFS_PROP_COMPRESSION) {
1374                         (void) zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1375                             "property setting is not allowed on "
1376                             "bootable datasets"));
1377                         (void) zfs_error(hdl, EZFS_NOTSUP, errbuf);
1378                 } else {
1379                         (void) zfs_standard_error(hdl, err, errbuf);
1380                 }
1381                 break;
1382
1383         case EINVAL:
1384                 if (prop == ZPROP_INVAL) {
1385                         (void) zfs_error(hdl, EZFS_BADPROP, errbuf);
1386                 } else {
1387                         (void) zfs_standard_error(hdl, err, errbuf);
1388                 }
1389                 break;
1390
1391         case EOVERFLOW:
1392                 /*
1393                  * This platform can't address a volume this big.
1394                  */
1395 #ifdef _ILP32
1396                 if (prop == ZFS_PROP_VOLSIZE) {
1397                         (void) zfs_error(hdl, EZFS_VOLTOOBIG, errbuf);
1398                         break;
1399                 }
1400 #endif
1401                 /* FALLTHROUGH */
1402         default:
1403                 (void) zfs_standard_error(hdl, err, errbuf);
1404         }
1405 }
1406
1407 static boolean_t
1408 zfs_is_namespace_prop(zfs_prop_t prop)
1409 {
1410         switch (prop) {
1411
1412         case ZFS_PROP_ATIME:
1413         case ZFS_PROP_DEVICES:
1414         case ZFS_PROP_EXEC:
1415         case ZFS_PROP_SETUID:
1416         case ZFS_PROP_READONLY:
1417         case ZFS_PROP_XATTR:
1418         case ZFS_PROP_NBMAND:
1419                 return (B_TRUE);
1420
1421         default:
1422                 return (B_FALSE);
1423         }
1424 }
1425
1426 /*
1427  * Given a property name and value, set the property for the given dataset.
1428  */
1429 int
1430 zfs_prop_set(zfs_handle_t *zhp, const char *propname, const char *propval)
1431 {
1432         zfs_cmd_t zc = {"\0"};
1433         int ret = -1;
1434         prop_changelist_t *cl = NULL;
1435         char errbuf[1024];
1436         libzfs_handle_t *hdl = zhp->zfs_hdl;
1437         nvlist_t *nvl = NULL, *realprops;
1438         zfs_prop_t prop;
1439         boolean_t do_prefix = B_TRUE;
1440         int added_resv = 0;
1441
1442         (void) snprintf(errbuf, sizeof (errbuf),
1443             dgettext(TEXT_DOMAIN, "cannot set property for '%s'"),
1444             zhp->zfs_name);
1445
1446         if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0 ||
1447             nvlist_add_string(nvl, propname, propval) != 0) {
1448                 (void) no_memory(hdl);
1449                 goto error;
1450         }
1451
1452         if ((realprops = zfs_valid_proplist(hdl, zhp->zfs_type, nvl,
1453             zfs_prop_get_int(zhp, ZFS_PROP_ZONED), zhp, errbuf)) == NULL)
1454                 goto error;
1455
1456         nvlist_free(nvl);
1457         nvl = realprops;
1458
1459         prop = zfs_name_to_prop(propname);
1460
1461         if (prop == ZFS_PROP_VOLSIZE) {
1462                 if ((added_resv = zfs_add_synthetic_resv(zhp, nvl)) == -1)
1463                         goto error;
1464         }
1465
1466         if ((cl = changelist_gather(zhp, prop, 0, 0)) == NULL)
1467                 goto error;
1468
1469         if (prop == ZFS_PROP_MOUNTPOINT && changelist_haszonedchild(cl)) {
1470                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1471                     "child dataset with inherited mountpoint is used "
1472                     "in a non-global zone"));
1473                 ret = zfs_error(hdl, EZFS_ZONED, errbuf);
1474                 goto error;
1475         }
1476
1477         /*
1478          * We don't want to unmount & remount the dataset when changing
1479          * its canmount property to 'on' or 'noauto'.  We only use
1480          * the changelist logic to unmount when setting canmount=off.
1481          */
1482         if (prop == ZFS_PROP_CANMOUNT) {
1483                 uint64_t idx;
1484                 int err = zprop_string_to_index(prop, propval, &idx,
1485                     ZFS_TYPE_DATASET);
1486                 if (err == 0 && idx != ZFS_CANMOUNT_OFF)
1487                         do_prefix = B_FALSE;
1488         }
1489
1490         if (do_prefix && (ret = changelist_prefix(cl)) != 0)
1491                 goto error;
1492
1493         /*
1494          * Execute the corresponding ioctl() to set this property.
1495          */
1496         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1497
1498         if (zcmd_write_src_nvlist(hdl, &zc, nvl) != 0)
1499                 goto error;
1500
1501         ret = zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc);
1502
1503         if (ret != 0) {
1504                 zfs_setprop_error(hdl, prop, errno, errbuf);
1505                 if (added_resv && errno == ENOSPC) {
1506                         /* clean up the volsize property we tried to set */
1507                         uint64_t old_volsize = zfs_prop_get_int(zhp,
1508                             ZFS_PROP_VOLSIZE);
1509                         nvlist_free(nvl);
1510                         zcmd_free_nvlists(&zc);
1511                         if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
1512                                 goto error;
1513                         if (nvlist_add_uint64(nvl,
1514                             zfs_prop_to_name(ZFS_PROP_VOLSIZE),
1515                             old_volsize) != 0)
1516                                 goto error;
1517                         if (zcmd_write_src_nvlist(hdl, &zc, nvl) != 0)
1518                                 goto error;
1519                         (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc);
1520                 }
1521         } else {
1522                 if (do_prefix)
1523                         ret = changelist_postfix(cl);
1524
1525                 if (ret == 0) {
1526                         /*
1527                          * Refresh the statistics so the new property
1528                          * value is reflected.
1529                          */
1530                         (void) get_stats(zhp);
1531
1532                         /*
1533                          * Remount the filesystem to propagate the change
1534                          * if one of the options handled by the generic
1535                          * Linux namespace layer has been modified.
1536                          */
1537                         if (zfs_is_namespace_prop(prop) &&
1538                             zfs_is_mounted(zhp, NULL))
1539                                 ret = zfs_mount(zhp, MNTOPT_REMOUNT, 0);
1540                 }
1541         }
1542
1543 error:
1544         nvlist_free(nvl);
1545         zcmd_free_nvlists(&zc);
1546         if (cl)
1547                 changelist_free(cl);
1548         return (ret);
1549 }
1550
1551 /*
1552  * Given a property, inherit the value from the parent dataset, or if received
1553  * is TRUE, revert to the received value, if any.
1554  */
1555 int
1556 zfs_prop_inherit(zfs_handle_t *zhp, const char *propname, boolean_t received)
1557 {
1558         zfs_cmd_t zc = {"\0"};
1559         int ret;
1560         prop_changelist_t *cl;
1561         libzfs_handle_t *hdl = zhp->zfs_hdl;
1562         char errbuf[1024];
1563         zfs_prop_t prop;
1564
1565         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1566             "cannot inherit %s for '%s'"), propname, zhp->zfs_name);
1567
1568         zc.zc_cookie = received;
1569         if ((prop = zfs_name_to_prop(propname)) == ZPROP_INVAL) {
1570                 /*
1571                  * For user properties, the amount of work we have to do is very
1572                  * small, so just do it here.
1573                  */
1574                 if (!zfs_prop_user(propname)) {
1575                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1576                             "invalid property"));
1577                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
1578                 }
1579
1580                 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1581                 (void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));
1582
1583                 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_INHERIT_PROP, &zc) != 0)
1584                         return (zfs_standard_error(hdl, errno, errbuf));
1585
1586                 return (0);
1587         }
1588
1589         /*
1590          * Verify that this property is inheritable.
1591          */
1592         if (zfs_prop_readonly(prop))
1593                 return (zfs_error(hdl, EZFS_PROPREADONLY, errbuf));
1594
1595         if (!zfs_prop_inheritable(prop) && !received)
1596                 return (zfs_error(hdl, EZFS_PROPNONINHERIT, errbuf));
1597
1598         /*
1599          * Check to see if the value applies to this type
1600          */
1601         if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
1602                 return (zfs_error(hdl, EZFS_PROPTYPE, errbuf));
1603
1604         /*
1605          * Normalize the name, to get rid of shorthand abbreviations.
1606          */
1607         propname = zfs_prop_to_name(prop);
1608         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1609         (void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));
1610
1611         if (prop == ZFS_PROP_MOUNTPOINT && getzoneid() == GLOBAL_ZONEID &&
1612             zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) {
1613                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1614                     "dataset is used in a non-global zone"));
1615                 return (zfs_error(hdl, EZFS_ZONED, errbuf));
1616         }
1617
1618         /*
1619          * Determine datasets which will be affected by this change, if any.
1620          */
1621         if ((cl = changelist_gather(zhp, prop, 0, 0)) == NULL)
1622                 return (-1);
1623
1624         if (prop == ZFS_PROP_MOUNTPOINT && changelist_haszonedchild(cl)) {
1625                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1626                     "child dataset with inherited mountpoint is used "
1627                     "in a non-global zone"));
1628                 ret = zfs_error(hdl, EZFS_ZONED, errbuf);
1629                 goto error;
1630         }
1631
1632         if ((ret = changelist_prefix(cl)) != 0)
1633                 goto error;
1634
1635         if ((ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_INHERIT_PROP, &zc)) != 0) {
1636                 return (zfs_standard_error(hdl, errno, errbuf));
1637         } else {
1638
1639                 if ((ret = changelist_postfix(cl)) != 0)
1640                         goto error;
1641
1642                 /*
1643                  * Refresh the statistics so the new property is reflected.
1644                  */
1645                 (void) get_stats(zhp);
1646         }
1647
1648 error:
1649         changelist_free(cl);
1650         return (ret);
1651 }
1652
1653 /*
1654  * True DSL properties are stored in an nvlist.  The following two functions
1655  * extract them appropriately.
1656  */
1657 uint64_t
1658 getprop_uint64(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
1659 {
1660         nvlist_t *nv;
1661         uint64_t value;
1662
1663         *source = NULL;
1664         if (nvlist_lookup_nvlist(zhp->zfs_props,
1665             zfs_prop_to_name(prop), &nv) == 0) {
1666                 verify(nvlist_lookup_uint64(nv, ZPROP_VALUE, &value) == 0);
1667                 (void) nvlist_lookup_string(nv, ZPROP_SOURCE, source);
1668         } else {
1669                 verify(!zhp->zfs_props_table ||
1670                     zhp->zfs_props_table[prop] == B_TRUE);
1671                 value = zfs_prop_default_numeric(prop);
1672                 *source = "";
1673         }
1674
1675         return (value);
1676 }
1677
1678 static char *
1679 getprop_string(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
1680 {
1681         nvlist_t *nv;
1682         char *value;
1683
1684         *source = NULL;
1685         if (nvlist_lookup_nvlist(zhp->zfs_props,
1686             zfs_prop_to_name(prop), &nv) == 0) {
1687                 verify(nvlist_lookup_string(nv, ZPROP_VALUE, &value) == 0);
1688                 (void) nvlist_lookup_string(nv, ZPROP_SOURCE, source);
1689         } else {
1690                 verify(!zhp->zfs_props_table ||
1691                     zhp->zfs_props_table[prop] == B_TRUE);
1692                 if ((value = (char *)zfs_prop_default_string(prop)) == NULL)
1693                         value = "";
1694                 *source = "";
1695         }
1696
1697         return (value);
1698 }
1699
1700 static boolean_t
1701 zfs_is_recvd_props_mode(zfs_handle_t *zhp)
1702 {
1703         return (zhp->zfs_props == zhp->zfs_recvd_props);
1704 }
1705
1706 static void
1707 zfs_set_recvd_props_mode(zfs_handle_t *zhp, uint64_t *cookie)
1708 {
1709         *cookie = (uint64_t)(uintptr_t)zhp->zfs_props;
1710         zhp->zfs_props = zhp->zfs_recvd_props;
1711 }
1712
1713 static void
1714 zfs_unset_recvd_props_mode(zfs_handle_t *zhp, uint64_t *cookie)
1715 {
1716         zhp->zfs_props = (nvlist_t *)(uintptr_t)*cookie;
1717         *cookie = 0;
1718 }
1719
1720 /*
1721  * Internal function for getting a numeric property.  Both zfs_prop_get() and
1722  * zfs_prop_get_int() are built using this interface.
1723  *
1724  * Certain properties can be overridden using 'mount -o'.  In this case, scan
1725  * the contents of the /etc/mtab entry, searching for the appropriate options.
1726  * If they differ from the on-disk values, report the current values and mark
1727  * the source "temporary".
1728  */
1729 static int
1730 get_numeric_property(zfs_handle_t *zhp, zfs_prop_t prop, zprop_source_t *src,
1731     char **source, uint64_t *val)
1732 {
1733         zfs_cmd_t zc = {"\0"};
1734         nvlist_t *zplprops = NULL;
1735         struct mnttab mnt;
1736         char *mntopt_on = NULL;
1737         char *mntopt_off = NULL;
1738         boolean_t received = zfs_is_recvd_props_mode(zhp);
1739
1740         *source = NULL;
1741
1742         switch (prop) {
1743         case ZFS_PROP_ATIME:
1744                 mntopt_on = MNTOPT_ATIME;
1745                 mntopt_off = MNTOPT_NOATIME;
1746                 break;
1747
1748         case ZFS_PROP_DEVICES:
1749                 mntopt_on = MNTOPT_DEVICES;
1750                 mntopt_off = MNTOPT_NODEVICES;
1751                 break;
1752
1753         case ZFS_PROP_EXEC:
1754                 mntopt_on = MNTOPT_EXEC;
1755                 mntopt_off = MNTOPT_NOEXEC;
1756                 break;
1757
1758         case ZFS_PROP_READONLY:
1759                 mntopt_on = MNTOPT_RO;
1760                 mntopt_off = MNTOPT_RW;
1761                 break;
1762
1763         case ZFS_PROP_SETUID:
1764                 mntopt_on = MNTOPT_SETUID;
1765                 mntopt_off = MNTOPT_NOSETUID;
1766                 break;
1767
1768         case ZFS_PROP_XATTR:
1769                 mntopt_on = MNTOPT_XATTR;
1770                 mntopt_off = MNTOPT_NOXATTR;
1771                 break;
1772
1773         case ZFS_PROP_NBMAND:
1774                 mntopt_on = MNTOPT_NBMAND;
1775                 mntopt_off = MNTOPT_NONBMAND;
1776                 break;
1777         default:
1778                 break;
1779         }
1780
1781         /*
1782          * Because looking up the mount options is potentially expensive
1783          * (iterating over all of /etc/mtab), we defer its calculation until
1784          * we're looking up a property which requires its presence.
1785          */
1786         if (!zhp->zfs_mntcheck &&
1787             (mntopt_on != NULL || prop == ZFS_PROP_MOUNTED)) {
1788                 libzfs_handle_t *hdl = zhp->zfs_hdl;
1789                 struct mnttab entry;
1790
1791                 if (libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0) {
1792                         zhp->zfs_mntopts = zfs_strdup(hdl,
1793                             entry.mnt_mntopts);
1794                         if (zhp->zfs_mntopts == NULL)
1795                                 return (-1);
1796                 }
1797
1798                 zhp->zfs_mntcheck = B_TRUE;
1799         }
1800
1801         if (zhp->zfs_mntopts == NULL)
1802                 mnt.mnt_mntopts = "";
1803         else
1804                 mnt.mnt_mntopts = zhp->zfs_mntopts;
1805
1806         switch (prop) {
1807         case ZFS_PROP_ATIME:
1808         case ZFS_PROP_DEVICES:
1809         case ZFS_PROP_EXEC:
1810         case ZFS_PROP_READONLY:
1811         case ZFS_PROP_SETUID:
1812         case ZFS_PROP_XATTR:
1813         case ZFS_PROP_NBMAND:
1814                 *val = getprop_uint64(zhp, prop, source);
1815
1816                 if (received)
1817                         break;
1818
1819                 if (hasmntopt(&mnt, mntopt_on) && !*val) {
1820                         *val = B_TRUE;
1821                         if (src)
1822                                 *src = ZPROP_SRC_TEMPORARY;
1823                 } else if (hasmntopt(&mnt, mntopt_off) && *val) {
1824                         *val = B_FALSE;
1825                         if (src)
1826                                 *src = ZPROP_SRC_TEMPORARY;
1827                 }
1828                 break;
1829
1830         case ZFS_PROP_CANMOUNT:
1831         case ZFS_PROP_VOLSIZE:
1832         case ZFS_PROP_QUOTA:
1833         case ZFS_PROP_REFQUOTA:
1834         case ZFS_PROP_RESERVATION:
1835         case ZFS_PROP_REFRESERVATION:
1836                 *val = getprop_uint64(zhp, prop, source);
1837
1838                 if (*source == NULL) {
1839                         /* not default, must be local */
1840                         *source = zhp->zfs_name;
1841                 }
1842                 break;
1843
1844         case ZFS_PROP_MOUNTED:
1845                 *val = (zhp->zfs_mntopts != NULL);
1846                 break;
1847
1848         case ZFS_PROP_NUMCLONES:
1849                 *val = zhp->zfs_dmustats.dds_num_clones;
1850                 break;
1851
1852         case ZFS_PROP_VERSION:
1853         case ZFS_PROP_NORMALIZE:
1854         case ZFS_PROP_UTF8ONLY:
1855         case ZFS_PROP_CASE:
1856                 if (!zfs_prop_valid_for_type(prop, zhp->zfs_head_type) ||
1857                     zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
1858                         return (-1);
1859                 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1860                 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_OBJSET_ZPLPROPS, &zc)) {
1861                         zcmd_free_nvlists(&zc);
1862                         return (-1);
1863                 }
1864                 if (zcmd_read_dst_nvlist(zhp->zfs_hdl, &zc, &zplprops) != 0 ||
1865                     nvlist_lookup_uint64(zplprops, zfs_prop_to_name(prop),
1866                     val) != 0) {
1867                         zcmd_free_nvlists(&zc);
1868                         return (-1);
1869                 }
1870                 if (zplprops)
1871                         nvlist_free(zplprops);
1872                 zcmd_free_nvlists(&zc);
1873                 break;
1874
1875         case ZFS_PROP_INCONSISTENT:
1876                 *val = zhp->zfs_dmustats.dds_inconsistent;
1877                 break;
1878
1879         default:
1880                 switch (zfs_prop_get_type(prop)) {
1881                 case PROP_TYPE_NUMBER:
1882                 case PROP_TYPE_INDEX:
1883                         *val = getprop_uint64(zhp, prop, source);
1884                         /*
1885                          * If we tried to use a default value for a
1886                          * readonly property, it means that it was not
1887                          * present.
1888                          */
1889                         if (zfs_prop_readonly(prop) &&
1890                             *source != NULL && (*source)[0] == '\0') {
1891                                 *source = NULL;
1892                         }
1893                         break;
1894
1895                 case PROP_TYPE_STRING:
1896                 default:
1897                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
1898                             "cannot get non-numeric property"));
1899                         return (zfs_error(zhp->zfs_hdl, EZFS_BADPROP,
1900                             dgettext(TEXT_DOMAIN, "internal error")));
1901                 }
1902         }
1903
1904         return (0);
1905 }
1906
1907 /*
1908  * Calculate the source type, given the raw source string.
1909  */
1910 static void
1911 get_source(zfs_handle_t *zhp, zprop_source_t *srctype, char *source,
1912     char *statbuf, size_t statlen)
1913 {
1914         if (statbuf == NULL || *srctype == ZPROP_SRC_TEMPORARY)
1915                 return;
1916
1917         if (source == NULL) {
1918                 *srctype = ZPROP_SRC_NONE;
1919         } else if (source[0] == '\0') {
1920                 *srctype = ZPROP_SRC_DEFAULT;
1921         } else if (strstr(source, ZPROP_SOURCE_VAL_RECVD) != NULL) {
1922                 *srctype = ZPROP_SRC_RECEIVED;
1923         } else {
1924                 if (strcmp(source, zhp->zfs_name) == 0) {
1925                         *srctype = ZPROP_SRC_LOCAL;
1926                 } else {
1927                         (void) strlcpy(statbuf, source, statlen);
1928                         *srctype = ZPROP_SRC_INHERITED;
1929                 }
1930         }
1931
1932 }
1933
1934 int
1935 zfs_prop_get_recvd(zfs_handle_t *zhp, const char *propname, char *propbuf,
1936     size_t proplen, boolean_t literal)
1937 {
1938         zfs_prop_t prop;
1939         int err = 0;
1940
1941         if (zhp->zfs_recvd_props == NULL)
1942                 if (get_recvd_props_ioctl(zhp) != 0)
1943                         return (-1);
1944
1945         prop = zfs_name_to_prop(propname);
1946
1947         if (prop != ZPROP_INVAL) {
1948                 uint64_t cookie;
1949                 if (!nvlist_exists(zhp->zfs_recvd_props, propname))
1950                         return (-1);
1951                 zfs_set_recvd_props_mode(zhp, &cookie);
1952                 err = zfs_prop_get(zhp, prop, propbuf, proplen,
1953                     NULL, NULL, 0, literal);
1954                 zfs_unset_recvd_props_mode(zhp, &cookie);
1955         } else {
1956                 nvlist_t *propval;
1957                 char *recvdval;
1958                 if (nvlist_lookup_nvlist(zhp->zfs_recvd_props,
1959                     propname, &propval) != 0)
1960                         return (-1);
1961                 verify(nvlist_lookup_string(propval, ZPROP_VALUE,
1962                     &recvdval) == 0);
1963                 (void) strlcpy(propbuf, recvdval, proplen);
1964         }
1965
1966         return (err == 0 ? 0 : -1);
1967 }
1968
1969 static int
1970 get_clones_string(zfs_handle_t *zhp, char *propbuf, size_t proplen)
1971 {
1972         nvlist_t *value;
1973         nvpair_t *pair;
1974
1975         value = zfs_get_clones_nvl(zhp);
1976         if (value == NULL)
1977                 return (-1);
1978
1979         propbuf[0] = '\0';
1980         for (pair = nvlist_next_nvpair(value, NULL); pair != NULL;
1981             pair = nvlist_next_nvpair(value, pair)) {
1982                 if (propbuf[0] != '\0')
1983                         (void) strlcat(propbuf, ",", proplen);
1984                 (void) strlcat(propbuf, nvpair_name(pair), proplen);
1985         }
1986
1987         return (0);
1988 }
1989
1990 struct get_clones_arg {
1991         uint64_t numclones;
1992         nvlist_t *value;
1993         const char *origin;
1994         char buf[ZFS_MAXNAMELEN];
1995 };
1996
1997 int
1998 get_clones_cb(zfs_handle_t *zhp, void *arg)
1999 {
2000         struct get_clones_arg *gca = arg;
2001
2002         if (gca->numclones == 0) {
2003                 zfs_close(zhp);
2004                 return (0);
2005         }
2006
2007         if (zfs_prop_get(zhp, ZFS_PROP_ORIGIN, gca->buf, sizeof (gca->buf),
2008             NULL, NULL, 0, B_TRUE) != 0)
2009                 goto out;
2010         if (strcmp(gca->buf, gca->origin) == 0) {
2011                 fnvlist_add_boolean(gca->value, zfs_get_name(zhp));
2012                 gca->numclones--;
2013         }
2014
2015 out:
2016         (void) zfs_iter_children(zhp, get_clones_cb, gca);
2017         zfs_close(zhp);
2018         return (0);
2019 }
2020
2021 nvlist_t *
2022 zfs_get_clones_nvl(zfs_handle_t *zhp)
2023 {
2024         nvlist_t *nv, *value;
2025
2026         if (nvlist_lookup_nvlist(zhp->zfs_props,
2027             zfs_prop_to_name(ZFS_PROP_CLONES), &nv) != 0) {
2028                 struct get_clones_arg gca;
2029
2030                 /*
2031                  * if this is a snapshot, then the kernel wasn't able
2032                  * to get the clones.  Do it by slowly iterating.
2033                  */
2034                 if (zhp->zfs_type != ZFS_TYPE_SNAPSHOT)
2035                         return (NULL);
2036                 if (nvlist_alloc(&nv, NV_UNIQUE_NAME, 0) != 0)
2037                         return (NULL);
2038                 if (nvlist_alloc(&value, NV_UNIQUE_NAME, 0) != 0) {
2039                         nvlist_free(nv);
2040                         return (NULL);
2041                 }
2042
2043                 gca.numclones = zfs_prop_get_int(zhp, ZFS_PROP_NUMCLONES);
2044                 gca.value = value;
2045                 gca.origin = zhp->zfs_name;
2046
2047                 if (gca.numclones != 0) {
2048                         zfs_handle_t *root;
2049                         char pool[ZFS_MAXNAMELEN];
2050                         char *cp = pool;
2051
2052                         /* get the pool name */
2053                         (void) strlcpy(pool, zhp->zfs_name, sizeof (pool));
2054                         (void) strsep(&cp, "/@");
2055                         root = zfs_open(zhp->zfs_hdl, pool,
2056                             ZFS_TYPE_FILESYSTEM);
2057
2058                         (void) get_clones_cb(root, &gca);
2059                 }
2060
2061                 if (gca.numclones != 0 ||
2062                     nvlist_add_nvlist(nv, ZPROP_VALUE, value) != 0 ||
2063                     nvlist_add_nvlist(zhp->zfs_props,
2064                     zfs_prop_to_name(ZFS_PROP_CLONES), nv) != 0) {
2065                         nvlist_free(nv);
2066                         nvlist_free(value);
2067                         return (NULL);
2068                 }
2069                 nvlist_free(nv);
2070                 nvlist_free(value);
2071                 verify(0 == nvlist_lookup_nvlist(zhp->zfs_props,
2072                     zfs_prop_to_name(ZFS_PROP_CLONES), &nv));
2073         }
2074
2075         verify(nvlist_lookup_nvlist(nv, ZPROP_VALUE, &value) == 0);
2076
2077         return (value);
2078 }
2079
2080 /*
2081  * Retrieve a property from the given object.  If 'literal' is specified, then
2082  * numbers are left as exact values.  Otherwise, numbers are converted to a
2083  * human-readable form.
2084  *
2085  * Returns 0 on success, or -1 on error.
2086  */
2087 int
2088 zfs_prop_get(zfs_handle_t *zhp, zfs_prop_t prop, char *propbuf, size_t proplen,
2089     zprop_source_t *src, char *statbuf, size_t statlen, boolean_t literal)
2090 {
2091         char *source = NULL;
2092         uint64_t val;
2093         char *str;
2094         const char *strval;
2095         boolean_t received = zfs_is_recvd_props_mode(zhp);
2096
2097         /*
2098          * Check to see if this property applies to our object
2099          */
2100         if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
2101                 return (-1);
2102
2103         if (received && zfs_prop_readonly(prop))
2104                 return (-1);
2105
2106         if (src)
2107                 *src = ZPROP_SRC_NONE;
2108
2109         switch (prop) {
2110         case ZFS_PROP_CREATION:
2111                 /*
2112                  * 'creation' is a time_t stored in the statistics.  We convert
2113                  * this into a string unless 'literal' is specified.
2114                  */
2115                 {
2116                         val = getprop_uint64(zhp, prop, &source);
2117                         time_t time = (time_t)val;
2118                         struct tm t;
2119
2120                         if (literal ||
2121                             localtime_r(&time, &t) == NULL ||
2122                             strftime(propbuf, proplen, "%a %b %e %k:%M %Y",
2123                             &t) == 0)
2124                                 (void) snprintf(propbuf, proplen, "%llu", (u_longlong_t) val);
2125                 }
2126                 break;
2127
2128         case ZFS_PROP_MOUNTPOINT:
2129                 /*
2130                  * Getting the precise mountpoint can be tricky.
2131                  *
2132                  *  - for 'none' or 'legacy', return those values.
2133                  *  - for inherited mountpoints, we want to take everything
2134                  *    after our ancestor and append it to the inherited value.
2135                  *
2136                  * If the pool has an alternate root, we want to prepend that
2137                  * root to any values we return.
2138                  */
2139
2140                 str = getprop_string(zhp, prop, &source);
2141
2142                 if (str[0] == '/') {
2143                         char buf[MAXPATHLEN];
2144                         char *root = buf;
2145                         const char *relpath;
2146
2147                         /*
2148                          * If we inherit the mountpoint, even from a dataset
2149                          * with a received value, the source will be the path of
2150                          * the dataset we inherit from. If source is
2151                          * ZPROP_SOURCE_VAL_RECVD, the received value is not
2152                          * inherited.
2153                          */
2154                         if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) {
2155                                 relpath = "";
2156                         } else {
2157                                 relpath = zhp->zfs_name + strlen(source);
2158                                 if (relpath[0] == '/')
2159                                         relpath++;
2160                         }
2161
2162                         if ((zpool_get_prop(zhp->zpool_hdl,
2163                             ZPOOL_PROP_ALTROOT, buf, MAXPATHLEN, NULL)) ||
2164                             (strcmp(root, "-") == 0))
2165                                 root[0] = '\0';
2166                         /*
2167                          * Special case an alternate root of '/'. This will
2168                          * avoid having multiple leading slashes in the
2169                          * mountpoint path.
2170                          */
2171                         if (strcmp(root, "/") == 0)
2172                                 root++;
2173
2174                         /*
2175                          * If the mountpoint is '/' then skip over this
2176                          * if we are obtaining either an alternate root or
2177                          * an inherited mountpoint.
2178                          */
2179                         if (str[1] == '\0' && (root[0] != '\0' ||
2180                             relpath[0] != '\0'))
2181                                 str++;
2182
2183                         if (relpath[0] == '\0')
2184                                 (void) snprintf(propbuf, proplen, "%s%s",
2185                                     root, str);
2186                         else
2187                                 (void) snprintf(propbuf, proplen, "%s%s%s%s",
2188                                     root, str, relpath[0] == '@' ? "" : "/",
2189                                     relpath);
2190                 } else {
2191                         /* 'legacy' or 'none' */
2192                         (void) strlcpy(propbuf, str, proplen);
2193                 }
2194
2195                 break;
2196
2197         case ZFS_PROP_ORIGIN:
2198                 (void) strlcpy(propbuf, getprop_string(zhp, prop, &source),
2199                     proplen);
2200                 /*
2201                  * If there is no parent at all, return failure to indicate that
2202                  * it doesn't apply to this dataset.
2203                  */
2204                 if (propbuf[0] == '\0')
2205                         return (-1);
2206                 break;
2207
2208         case ZFS_PROP_CLONES:
2209                 if (get_clones_string(zhp, propbuf, proplen) != 0)
2210                         return (-1);
2211                 break;
2212
2213         case ZFS_PROP_QUOTA:
2214         case ZFS_PROP_REFQUOTA:
2215         case ZFS_PROP_RESERVATION:
2216         case ZFS_PROP_REFRESERVATION:
2217
2218                 if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
2219                         return (-1);
2220
2221                 /*
2222                  * If quota or reservation is 0, we translate this into 'none'
2223                  * (unless literal is set), and indicate that it's the default
2224                  * value.  Otherwise, we print the number nicely and indicate
2225                  * that its set locally.
2226                  */
2227                 if (val == 0) {
2228                         if (literal)
2229                                 (void) strlcpy(propbuf, "0", proplen);
2230                         else
2231                                 (void) strlcpy(propbuf, "none", proplen);
2232                 } else {
2233                         if (literal)
2234                                 (void) snprintf(propbuf, proplen, "%llu",
2235                                     (u_longlong_t)val);
2236                         else
2237                                 zfs_nicenum(val, propbuf, proplen);
2238                 }
2239                 break;
2240
2241         case ZFS_PROP_REFRATIO:
2242         case ZFS_PROP_COMPRESSRATIO:
2243                 if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
2244                         return (-1);
2245                 (void) snprintf(propbuf, proplen, "%llu.%02llux",
2246                     (u_longlong_t)(val / 100),
2247                     (u_longlong_t)(val % 100));
2248                 break;
2249
2250         case ZFS_PROP_TYPE:
2251                 switch (zhp->zfs_type) {
2252                 case ZFS_TYPE_FILESYSTEM:
2253                         str = "filesystem";
2254                         break;
2255                 case ZFS_TYPE_VOLUME:
2256                         str = "volume";
2257                         break;
2258                 case ZFS_TYPE_SNAPSHOT:
2259                         str = "snapshot";
2260                         break;
2261                 default:
2262                         abort();
2263                 }
2264                 (void) snprintf(propbuf, proplen, "%s", str);
2265                 break;
2266
2267         case ZFS_PROP_MOUNTED:
2268                 /*
2269                  * The 'mounted' property is a pseudo-property that described
2270                  * whether the filesystem is currently mounted.  Even though
2271                  * it's a boolean value, the typical values of "on" and "off"
2272                  * don't make sense, so we translate to "yes" and "no".
2273                  */
2274                 if (get_numeric_property(zhp, ZFS_PROP_MOUNTED,
2275                     src, &source, &val) != 0)
2276                         return (-1);
2277                 if (val)
2278                         (void) strlcpy(propbuf, "yes", proplen);
2279                 else
2280                         (void) strlcpy(propbuf, "no", proplen);
2281                 break;
2282
2283         case ZFS_PROP_NAME:
2284                 /*
2285                  * The 'name' property is a pseudo-property derived from the
2286                  * dataset name.  It is presented as a real property to simplify
2287                  * consumers.
2288                  */
2289                 (void) strlcpy(propbuf, zhp->zfs_name, proplen);
2290                 break;
2291
2292         case ZFS_PROP_MLSLABEL:
2293                 {
2294 #ifdef HAVE_MLSLABEL
2295                         m_label_t *new_sl = NULL;
2296                         char *ascii = NULL;     /* human readable label */
2297
2298                         (void) strlcpy(propbuf,
2299                             getprop_string(zhp, prop, &source), proplen);
2300
2301                         if (literal || (strcasecmp(propbuf,
2302                             ZFS_MLSLABEL_DEFAULT) == 0))
2303                                 break;
2304
2305                         /*
2306                          * Try to translate the internal hex string to
2307                          * human-readable output.  If there are any
2308                          * problems just use the hex string.
2309                          */
2310
2311                         if (str_to_label(propbuf, &new_sl, MAC_LABEL,
2312                             L_NO_CORRECTION, NULL) == -1) {
2313                                 m_label_free(new_sl);
2314                                 break;
2315                         }
2316
2317                         if (label_to_str(new_sl, &ascii, M_LABEL,
2318                             DEF_NAMES) != 0) {
2319                                 if (ascii)
2320                                         free(ascii);
2321                                 m_label_free(new_sl);
2322                                 break;
2323                         }
2324                         m_label_free(new_sl);
2325
2326                         (void) strlcpy(propbuf, ascii, proplen);
2327                         free(ascii);
2328 #else
2329                         (void) strlcpy(propbuf,
2330                             getprop_string(zhp, prop, &source), proplen);
2331 #endif /* HAVE_MLSLABEL */
2332                 }
2333                 break;
2334
2335         case ZFS_PROP_GUID:
2336                 /*
2337                  * GUIDs are stored as numbers, but they are identifiers.
2338                  * We don't want them to be pretty printed, because pretty
2339                  * printing mangles the ID into a truncated and useless value.
2340                  */
2341                 if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
2342                         return (-1);
2343                 (void) snprintf(propbuf, proplen, "%llu", (u_longlong_t)val);
2344                 break;
2345
2346         default:
2347                 switch (zfs_prop_get_type(prop)) {
2348                 case PROP_TYPE_NUMBER:
2349                         if (get_numeric_property(zhp, prop, src,
2350                             &source, &val) != 0)
2351                                 return (-1);
2352                         if (literal)
2353                                 (void) snprintf(propbuf, proplen, "%llu",
2354                                     (u_longlong_t)val);
2355                         else
2356                                 zfs_nicenum(val, propbuf, proplen);
2357                         break;
2358
2359                 case PROP_TYPE_STRING:
2360                         (void) strlcpy(propbuf,
2361                             getprop_string(zhp, prop, &source), proplen);
2362                         break;
2363
2364                 case PROP_TYPE_INDEX:
2365                         if (get_numeric_property(zhp, prop, src,
2366                             &source, &val) != 0)
2367                                 return (-1);
2368                         if (zfs_prop_index_to_string(prop, val, &strval) != 0)
2369                                 return (-1);
2370                         (void) strlcpy(propbuf, strval, proplen);
2371                         break;
2372
2373                 default:
2374                         abort();
2375                 }
2376         }
2377
2378         get_source(zhp, src, source, statbuf, statlen);
2379
2380         return (0);
2381 }
2382
2383 /*
2384  * Utility function to get the given numeric property.  Does no validation that
2385  * the given property is the appropriate type; should only be used with
2386  * hard-coded property types.
2387  */
2388 uint64_t
2389 zfs_prop_get_int(zfs_handle_t *zhp, zfs_prop_t prop)
2390 {
2391         char *source;
2392         uint64_t val;
2393
2394         (void) get_numeric_property(zhp, prop, NULL, &source, &val);
2395
2396         return (val);
2397 }
2398
2399 int
2400 zfs_prop_set_int(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t val)
2401 {
2402         char buf[64];
2403
2404         (void) snprintf(buf, sizeof (buf), "%llu", (longlong_t)val);
2405         return (zfs_prop_set(zhp, zfs_prop_to_name(prop), buf));
2406 }
2407
2408 /*
2409  * Similar to zfs_prop_get(), but returns the value as an integer.
2410  */
2411 int
2412 zfs_prop_get_numeric(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t *value,
2413     zprop_source_t *src, char *statbuf, size_t statlen)
2414 {
2415         char *source;
2416
2417         /*
2418          * Check to see if this property applies to our object
2419          */
2420         if (!zfs_prop_valid_for_type(prop, zhp->zfs_type)) {
2421                 return (zfs_error_fmt(zhp->zfs_hdl, EZFS_PROPTYPE,
2422                     dgettext(TEXT_DOMAIN, "cannot get property '%s'"),
2423                     zfs_prop_to_name(prop)));
2424         }
2425
2426         if (src)
2427                 *src = ZPROP_SRC_NONE;
2428
2429         if (get_numeric_property(zhp, prop, src, &source, value) != 0)
2430                 return (-1);
2431
2432         get_source(zhp, src, source, statbuf, statlen);
2433
2434         return (0);
2435 }
2436
2437 #ifdef HAVE_IDMAP
2438 static int
2439 idmap_id_to_numeric_domain_rid(uid_t id, boolean_t isuser,
2440     char **domainp, idmap_rid_t *ridp)
2441 {
2442         idmap_get_handle_t *get_hdl = NULL;
2443         idmap_stat status;
2444         int err = EINVAL;
2445
2446         if (idmap_get_create(&get_hdl) != IDMAP_SUCCESS)
2447                 goto out;
2448
2449         if (isuser) {
2450                 err = idmap_get_sidbyuid(get_hdl, id,
2451                     IDMAP_REQ_FLG_USE_CACHE, domainp, ridp, &status);
2452         } else {
2453                 err = idmap_get_sidbygid(get_hdl, id,
2454                     IDMAP_REQ_FLG_USE_CACHE, domainp, ridp, &status);
2455         }
2456         if (err == IDMAP_SUCCESS &&
2457             idmap_get_mappings(get_hdl) == IDMAP_SUCCESS &&
2458             status == IDMAP_SUCCESS)
2459                 err = 0;
2460         else
2461                 err = EINVAL;
2462 out:
2463         if (get_hdl)
2464                 idmap_get_destroy(get_hdl);
2465         return (err);
2466 }
2467 #endif /* HAVE_IDMAP */
2468
2469 /*
2470  * convert the propname into parameters needed by kernel
2471  * Eg: userquota@ahrens -> ZFS_PROP_USERQUOTA, "", 126829
2472  * Eg: userused@matt@domain -> ZFS_PROP_USERUSED, "S-1-123-456", 789
2473  * Eg: groupquota@staff -> ZFS_PROP_GROUPQUOTA, "", 1234
2474  * Eg: groupused@staff -> ZFS_PROP_GROUPUSED, "", 1234
2475  */
2476 static int
2477 userquota_propname_decode(const char *propname, boolean_t zoned,
2478     zfs_userquota_prop_t *typep, char *domain, int domainlen, uint64_t *ridp)
2479 {
2480         zfs_userquota_prop_t type;
2481         char *cp;
2482         boolean_t isuser;
2483         boolean_t isgroup;
2484         struct passwd *pw;
2485         struct group *gr;
2486
2487         domain[0] = '\0';
2488
2489         /* Figure out the property type ({user|group}{quota|space}) */
2490         for (type = 0; type < ZFS_NUM_USERQUOTA_PROPS; type++) {
2491                 if (strncmp(propname, zfs_userquota_prop_prefixes[type],
2492                     strlen(zfs_userquota_prop_prefixes[type])) == 0)
2493                         break;
2494         }
2495         if (type == ZFS_NUM_USERQUOTA_PROPS)
2496                 return (EINVAL);
2497         *typep = type;
2498
2499         isuser = (type == ZFS_PROP_USERQUOTA || type == ZFS_PROP_USERUSED);
2500         isgroup = (type == ZFS_PROP_GROUPQUOTA || type == ZFS_PROP_GROUPUSED);
2501
2502         cp = strchr(propname, '@') + 1;
2503
2504         if (isuser && (pw = getpwnam(cp)) != NULL) {
2505                 if (zoned && getzoneid() == GLOBAL_ZONEID)
2506                         return (ENOENT);
2507                 *ridp = pw->pw_uid;
2508         } else if (isgroup && (gr = getgrnam(cp)) != NULL) {
2509                 if (zoned && getzoneid() == GLOBAL_ZONEID)
2510                         return (ENOENT);
2511                 *ridp = gr->gr_gid;
2512         } else if (strchr(cp, '@')) {
2513 #ifdef HAVE_IDMAP
2514                 /*
2515                  * It's a SID name (eg "user@domain") that needs to be
2516                  * turned into S-1-domainID-RID.
2517                  */
2518                 directory_error_t e;
2519                 char *numericsid = NULL;
2520                 char *end;
2521
2522                 if (zoned && getzoneid() == GLOBAL_ZONEID)
2523                         return (ENOENT);
2524                 if (isuser) {
2525                         e = directory_sid_from_user_name(NULL,
2526                             cp, &numericsid);
2527                 } else {
2528                         e = directory_sid_from_group_name(NULL,
2529                             cp, &numericsid);
2530                 }
2531                 if (e != NULL) {
2532                         directory_error_free(e);
2533                         return (ENOENT);
2534                 }
2535                 if (numericsid == NULL)
2536                         return (ENOENT);
2537                 cp = numericsid;
2538                 (void) strlcpy(domain, cp, domainlen);
2539                 cp = strrchr(domain, '-');
2540                 *cp = '\0';
2541                 cp++;
2542
2543                 errno = 0;
2544                 *ridp = strtoull(cp, &end, 10);
2545                 free(numericsid);
2546
2547                 if (errno != 0 || *end != '\0')
2548                         return (EINVAL);
2549 #else
2550                 return (ENOSYS);
2551 #endif /* HAVE_IDMAP */
2552         } else {
2553                 /* It's a user/group ID (eg "12345"). */
2554                 uid_t id;
2555                 char *end;
2556                 id = strtoul(cp, &end, 10);
2557                 if (*end != '\0')
2558                         return (EINVAL);
2559                 if (id > MAXUID) {
2560 #ifdef HAVE_IDMAP
2561                         /* It's an ephemeral ID. */
2562                         idmap_rid_t rid;
2563                         char *mapdomain;
2564
2565                         if (idmap_id_to_numeric_domain_rid(id, isuser,
2566                             &mapdomain, &rid) != 0)
2567                                 return (ENOENT);
2568                         (void) strlcpy(domain, mapdomain, domainlen);
2569                         *ridp = rid;
2570 #else
2571                         return (ENOSYS);
2572 #endif /* HAVE_IDMAP */
2573                 } else {
2574                         *ridp = id;
2575                 }
2576         }
2577
2578         return (0);
2579 }
2580
2581 static int
2582 zfs_prop_get_userquota_common(zfs_handle_t *zhp, const char *propname,
2583     uint64_t *propvalue, zfs_userquota_prop_t *typep)
2584 {
2585         int err;
2586         zfs_cmd_t zc = {"\0"};
2587
2588         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
2589
2590         err = userquota_propname_decode(propname,
2591             zfs_prop_get_int(zhp, ZFS_PROP_ZONED),
2592             typep, zc.zc_value, sizeof (zc.zc_value), &zc.zc_guid);
2593         zc.zc_objset_type = *typep;
2594         if (err)
2595                 return (err);
2596
2597         err = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_USERSPACE_ONE, &zc);
2598         if (err)
2599                 return (err);
2600
2601         *propvalue = zc.zc_cookie;
2602         return (0);
2603 }
2604
2605 int
2606 zfs_prop_get_userquota_int(zfs_handle_t *zhp, const char *propname,
2607     uint64_t *propvalue)
2608 {
2609         zfs_userquota_prop_t type;
2610
2611         return (zfs_prop_get_userquota_common(zhp, propname, propvalue,
2612             &type));
2613 }
2614
2615 int
2616 zfs_prop_get_userquota(zfs_handle_t *zhp, const char *propname,
2617     char *propbuf, int proplen, boolean_t literal)
2618 {
2619         int err;
2620         uint64_t propvalue;
2621         zfs_userquota_prop_t type;
2622
2623         err = zfs_prop_get_userquota_common(zhp, propname, &propvalue,
2624             &type);
2625
2626         if (err)
2627                 return (err);
2628
2629         if (literal) {
2630                 (void) snprintf(propbuf, proplen, "%llu",
2631                                (u_longlong_t)propvalue);
2632         } else if (propvalue == 0 &&
2633             (type == ZFS_PROP_USERQUOTA || type == ZFS_PROP_GROUPQUOTA)) {
2634                 (void) strlcpy(propbuf, "none", proplen);
2635         } else {
2636                 zfs_nicenum(propvalue, propbuf, proplen);
2637         }
2638         return (0);
2639 }
2640
2641 int
2642 zfs_prop_get_written_int(zfs_handle_t *zhp, const char *propname,
2643     uint64_t *propvalue)
2644 {
2645         int err;
2646         zfs_cmd_t zc = {"\0"};
2647         const char *snapname;
2648
2649         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
2650
2651         snapname = strchr(propname, '@') + 1;
2652         if (strchr(snapname, '@')) {
2653                 (void) strlcpy(zc.zc_value, snapname, sizeof (zc.zc_value));
2654         } else {
2655                 /* snapname is the short name, append it to zhp's fsname */
2656                 char *cp;
2657
2658                 (void) strlcpy(zc.zc_value, zhp->zfs_name,
2659                     sizeof (zc.zc_value));
2660                 cp = strchr(zc.zc_value, '@');
2661                 if (cp != NULL)
2662                         *cp = '\0';
2663                 (void) strlcat(zc.zc_value, "@", sizeof (zc.zc_value));
2664                 (void) strlcat(zc.zc_value, snapname, sizeof (zc.zc_value));
2665         }
2666
2667         err = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SPACE_WRITTEN, &zc);
2668         if (err)
2669                 return (err);
2670
2671         *propvalue = zc.zc_cookie;
2672         return (0);
2673 }
2674
2675 int
2676 zfs_prop_get_written(zfs_handle_t *zhp, const char *propname,
2677     char *propbuf, int proplen, boolean_t literal)
2678 {
2679         int err;
2680         uint64_t propvalue;
2681
2682         err = zfs_prop_get_written_int(zhp, propname, &propvalue);
2683
2684         if (err)
2685                 return (err);
2686
2687         if (literal) {
2688                 (void) snprintf(propbuf, proplen, "%llu", (long long unsigned int)propvalue);
2689         } else {
2690                 zfs_nicenum(propvalue, propbuf, proplen);
2691         }
2692
2693         return (0);
2694 }
2695
2696 /*
2697  * Returns the name of the given zfs handle.
2698  */
2699 const char *
2700 zfs_get_name(const zfs_handle_t *zhp)
2701 {
2702         return (zhp->zfs_name);
2703 }
2704
2705 /*
2706  * Returns the type of the given zfs handle.
2707  */
2708 zfs_type_t
2709 zfs_get_type(const zfs_handle_t *zhp)
2710 {
2711         return (zhp->zfs_type);
2712 }
2713
2714 /*
2715  * Is one dataset name a child dataset of another?
2716  *
2717  * Needs to handle these cases:
2718  * Dataset 1    "a/foo"         "a/foo"         "a/foo"         "a/foo"
2719  * Dataset 2    "a/fo"          "a/foobar"      "a/bar/baz"     "a/foo/bar"
2720  * Descendant?  No.             No.             No.             Yes.
2721  */
2722 static boolean_t
2723 is_descendant(const char *ds1, const char *ds2)
2724 {
2725         size_t d1len = strlen(ds1);
2726
2727         /* ds2 can't be a descendant if it's smaller */
2728         if (strlen(ds2) < d1len)
2729                 return (B_FALSE);
2730
2731         /* otherwise, compare strings and verify that there's a '/' char */
2732         return (ds2[d1len] == '/' && (strncmp(ds1, ds2, d1len) == 0));
2733 }
2734
2735 /*
2736  * Given a complete name, return just the portion that refers to the parent.
2737  * Will return -1 if there is no parent (path is just the name of the
2738  * pool).
2739  */
2740 static int
2741 parent_name(const char *path, char *buf, size_t buflen)
2742 {
2743         char *slashp;
2744
2745         (void) strlcpy(buf, path, buflen);
2746
2747         if ((slashp = strrchr(buf, '/')) == NULL)
2748                 return (-1);
2749         *slashp = '\0';
2750
2751         return (0);
2752 }
2753
2754 /*
2755  * If accept_ancestor is false, then check to make sure that the given path has
2756  * a parent, and that it exists.  If accept_ancestor is true, then find the
2757  * closest existing ancestor for the given path.  In prefixlen return the
2758  * length of already existing prefix of the given path.  We also fetch the
2759  * 'zoned' property, which is used to validate property settings when creating
2760  * new datasets.
2761  */
2762 static int
2763 check_parents(libzfs_handle_t *hdl, const char *path, uint64_t *zoned,
2764     boolean_t accept_ancestor, int *prefixlen)
2765 {
2766         zfs_cmd_t zc = {"\0"};
2767         char parent[ZFS_MAXNAMELEN];
2768         char *slash;
2769         zfs_handle_t *zhp;
2770         char errbuf[1024];
2771         uint64_t is_zoned;
2772
2773         (void) snprintf(errbuf, sizeof (errbuf),
2774             dgettext(TEXT_DOMAIN, "cannot create '%s'"), path);
2775
2776         /* get parent, and check to see if this is just a pool */
2777         if (parent_name(path, parent, sizeof (parent)) != 0) {
2778                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2779                     "missing dataset name"));
2780                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2781         }
2782
2783         /* check to see if the pool exists */
2784         if ((slash = strchr(parent, '/')) == NULL)
2785                 slash = parent + strlen(parent);
2786         (void) strncpy(zc.zc_name, parent, slash - parent);
2787         zc.zc_name[slash - parent] = '\0';
2788         if (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0 &&
2789             errno == ENOENT) {
2790                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2791                     "no such pool '%s'"), zc.zc_name);
2792                 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2793         }
2794
2795         /* check to see if the parent dataset exists */
2796         while ((zhp = make_dataset_handle(hdl, parent)) == NULL) {
2797                 if (errno == ENOENT && accept_ancestor) {
2798                         /*
2799                          * Go deeper to find an ancestor, give up on top level.
2800                          */
2801                         if (parent_name(parent, parent, sizeof (parent)) != 0) {
2802                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2803                                     "no such pool '%s'"), zc.zc_name);
2804                                 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2805                         }
2806                 } else if (errno == ENOENT) {
2807                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2808                             "parent does not exist"));
2809                         return (zfs_error(hdl, EZFS_NOENT, errbuf));
2810                 } else
2811                         return (zfs_standard_error(hdl, errno, errbuf));
2812         }
2813
2814         is_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
2815         if (zoned != NULL)
2816                 *zoned = is_zoned;
2817
2818         /* we are in a non-global zone, but parent is in the global zone */
2819         if (getzoneid() != GLOBAL_ZONEID && !is_zoned) {
2820                 (void) zfs_standard_error(hdl, EPERM, errbuf);
2821                 zfs_close(zhp);
2822                 return (-1);
2823         }
2824
2825         /* make sure parent is a filesystem */
2826         if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
2827                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2828                     "parent is not a filesystem"));
2829                 (void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
2830                 zfs_close(zhp);
2831                 return (-1);
2832         }
2833
2834         zfs_close(zhp);
2835         if (prefixlen != NULL)
2836                 *prefixlen = strlen(parent);
2837         return (0);
2838 }
2839
2840 /*
2841  * Finds whether the dataset of the given type(s) exists.
2842  */
2843 boolean_t
2844 zfs_dataset_exists(libzfs_handle_t *hdl, const char *path, zfs_type_t types)
2845 {
2846         zfs_handle_t *zhp;
2847
2848         if (!zfs_validate_name(hdl, path, types, B_FALSE))
2849                 return (B_FALSE);
2850
2851         /*
2852          * Try to get stats for the dataset, which will tell us if it exists.
2853          */
2854         if ((zhp = make_dataset_handle(hdl, path)) != NULL) {
2855                 int ds_type = zhp->zfs_type;
2856
2857                 zfs_close(zhp);
2858                 if (types & ds_type)
2859                         return (B_TRUE);
2860         }
2861         return (B_FALSE);
2862 }
2863
2864 /*
2865  * Given a path to 'target', create all the ancestors between
2866  * the prefixlen portion of the path, and the target itself.
2867  * Fail if the initial prefixlen-ancestor does not already exist.
2868  */
2869 int
2870 create_parents(libzfs_handle_t *hdl, char *target, int prefixlen)
2871 {
2872         zfs_handle_t *h;
2873         char *cp;
2874         const char *opname;
2875
2876         /* make sure prefix exists */
2877         cp = target + prefixlen;
2878         if (*cp != '/') {
2879                 assert(strchr(cp, '/') == NULL);
2880                 h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
2881         } else {
2882                 *cp = '\0';
2883                 h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
2884                 *cp = '/';
2885         }
2886         if (h == NULL)
2887                 return (-1);
2888         zfs_close(h);
2889
2890         /*
2891          * Attempt to create, mount, and share any ancestor filesystems,
2892          * up to the prefixlen-long one.
2893          */
2894         for (cp = target + prefixlen + 1;
2895             (cp = strchr(cp, '/')); *cp = '/', cp++) {
2896
2897                 *cp = '\0';
2898
2899                 h = make_dataset_handle(hdl, target);
2900                 if (h) {
2901                         /* it already exists, nothing to do here */
2902                         zfs_close(h);
2903                         continue;
2904                 }
2905
2906                 if (zfs_create(hdl, target, ZFS_TYPE_FILESYSTEM,
2907                     NULL) != 0) {
2908                         opname = dgettext(TEXT_DOMAIN, "create");
2909                         goto ancestorerr;
2910                 }
2911
2912                 h = zfs_open(hdl, target, ZFS_TYPE_FILESYSTEM);
2913                 if (h == NULL) {
2914                         opname = dgettext(TEXT_DOMAIN, "open");
2915                         goto ancestorerr;
2916                 }
2917
2918                 if (zfs_mount(h, NULL, 0) != 0) {
2919                         opname = dgettext(TEXT_DOMAIN, "mount");
2920                         goto ancestorerr;
2921                 }
2922
2923                 if (zfs_share(h) != 0) {
2924                         opname = dgettext(TEXT_DOMAIN, "share");
2925                         goto ancestorerr;
2926                 }
2927
2928                 zfs_close(h);
2929         }
2930
2931         return (0);
2932
2933 ancestorerr:
2934         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2935             "failed to %s ancestor '%s'"), opname, target);
2936         return (-1);
2937 }
2938
2939 /*
2940  * Creates non-existing ancestors of the given path.
2941  */
2942 int
2943 zfs_create_ancestors(libzfs_handle_t *hdl, const char *path)
2944 {
2945         int prefix;
2946         char *path_copy;
2947         int rc = 0;
2948
2949         if (check_parents(hdl, path, NULL, B_TRUE, &prefix) != 0)
2950                 return (-1);
2951
2952         if ((path_copy = strdup(path)) != NULL) {
2953                 rc = create_parents(hdl, path_copy, prefix);
2954                 free(path_copy);
2955         }
2956         if (path_copy == NULL || rc != 0)
2957                 return (-1);
2958
2959         return (0);
2960 }
2961
2962 /*
2963  * Create a new filesystem or volume.
2964  */
2965 int
2966 zfs_create(libzfs_handle_t *hdl, const char *path, zfs_type_t type,
2967     nvlist_t *props)
2968 {
2969         int ret;
2970         uint64_t size = 0;
2971         uint64_t blocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
2972         char errbuf[1024];
2973         uint64_t zoned;
2974         dmu_objset_type_t ost;
2975
2976         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2977             "cannot create '%s'"), path);
2978
2979         /* validate the path, taking care to note the extended error message */
2980         if (!zfs_validate_name(hdl, path, type, B_TRUE))
2981                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2982
2983         /* validate parents exist */
2984         if (check_parents(hdl, path, &zoned, B_FALSE, NULL) != 0)
2985                 return (-1);
2986
2987         /*
2988          * The failure modes when creating a dataset of a different type over
2989          * one that already exists is a little strange.  In particular, if you
2990          * try to create a dataset on top of an existing dataset, the ioctl()
2991          * will return ENOENT, not EEXIST.  To prevent this from happening, we
2992          * first try to see if the dataset exists.
2993          */
2994         if (zfs_dataset_exists(hdl, path, ZFS_TYPE_DATASET)) {
2995                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2996                     "dataset already exists"));
2997                 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
2998         }
2999
3000         if (type == ZFS_TYPE_VOLUME)
3001                 ost = DMU_OST_ZVOL;
3002         else
3003                 ost = DMU_OST_ZFS;
3004
3005         if (props && (props = zfs_valid_proplist(hdl, type, props,
3006             zoned, NULL, errbuf)) == 0)
3007                 return (-1);
3008
3009         if (type == ZFS_TYPE_VOLUME) {
3010                 /*
3011                  * If we are creating a volume, the size and block size must
3012                  * satisfy a few restraints.  First, the blocksize must be a
3013                  * valid block size between SPA_{MIN,MAX}BLOCKSIZE.  Second, the
3014                  * volsize must be a multiple of the block size, and cannot be
3015                  * zero.
3016                  */
3017                 if (props == NULL || nvlist_lookup_uint64(props,
3018                     zfs_prop_to_name(ZFS_PROP_VOLSIZE), &size) != 0) {
3019                         nvlist_free(props);
3020                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3021                             "missing volume size"));
3022                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3023                 }
3024
3025                 if ((ret = nvlist_lookup_uint64(props,
3026                     zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
3027                     &blocksize)) != 0) {
3028                         if (ret == ENOENT) {
3029                                 blocksize = zfs_prop_default_numeric(
3030                                     ZFS_PROP_VOLBLOCKSIZE);
3031                         } else {
3032                                 nvlist_free(props);
3033                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3034                                     "missing volume block size"));
3035                                 return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3036                         }
3037                 }
3038
3039                 if (size == 0) {
3040                         nvlist_free(props);
3041                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3042                             "volume size cannot be zero"));
3043                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3044                 }
3045
3046                 if (size % blocksize != 0) {
3047                         nvlist_free(props);
3048                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3049                             "volume size must be a multiple of volume block "
3050                             "size"));
3051                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3052                 }
3053         }
3054
3055         /* create the dataset */
3056         ret = lzc_create(path, ost, props);
3057         nvlist_free(props);
3058
3059         if (ret == 0 && type == ZFS_TYPE_VOLUME) {
3060                 ret = zvol_create_link(hdl, path);
3061                 if (ret) {
3062                         (void) zfs_standard_error(hdl, errno,
3063                             dgettext(TEXT_DOMAIN,
3064                             "Volume successfully created, but device links "
3065                             "were not created"));
3066                         return (-1);
3067                 }
3068         }
3069
3070         /* check for failure */
3071         if (ret != 0) {
3072                 char parent[ZFS_MAXNAMELEN];
3073                 (void) parent_name(path, parent, sizeof (parent));
3074
3075                 switch (errno) {
3076                 case ENOENT:
3077                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3078                             "no such parent '%s'"), parent);
3079                         return (zfs_error(hdl, EZFS_NOENT, errbuf));
3080
3081                 case EINVAL:
3082                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3083                             "parent '%s' is not a filesystem"), parent);
3084                         return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3085
3086                 case EDOM:
3087                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3088                             "volume block size must be power of 2 from "
3089                             "%u to %uk"),
3090                             (uint_t)SPA_MINBLOCKSIZE,
3091                             (uint_t)SPA_MAXBLOCKSIZE >> 10);
3092
3093                         return (zfs_error(hdl, EZFS_BADPROP, errbuf));
3094
3095                 case ENOTSUP:
3096                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3097                             "pool must be upgraded to set this "
3098                             "property or value"));
3099                         return (zfs_error(hdl, EZFS_BADVERSION, errbuf));
3100 #ifdef _ILP32
3101                 case EOVERFLOW:
3102                         /*
3103                          * This platform can't address a volume this big.
3104                          */
3105                         if (type == ZFS_TYPE_VOLUME)
3106                                 return (zfs_error(hdl, EZFS_VOLTOOBIG,
3107                                     errbuf));
3108 #endif
3109                         /* FALLTHROUGH */
3110                 default:
3111                         return (zfs_standard_error(hdl, errno, errbuf));
3112                 }
3113         }
3114
3115         return (0);
3116 }
3117
3118 /*
3119  * Destroys the given dataset.  The caller must make sure that the filesystem
3120  * isn't mounted, and that there are no active dependents. If the file system
3121  * does not exist this function does nothing.
3122  */
3123 int
3124 zfs_destroy(zfs_handle_t *zhp, boolean_t defer)
3125 {
3126         zfs_cmd_t zc = {"\0"};
3127
3128         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3129
3130         if (ZFS_IS_VOLUME(zhp)) {
3131                 if (zvol_remove_link(zhp->zfs_hdl, zhp->zfs_name) != 0)
3132                         return (-1);
3133
3134                 zc.zc_objset_type = DMU_OST_ZVOL;
3135         } else {
3136                 zc.zc_objset_type = DMU_OST_ZFS;
3137         }
3138
3139         zc.zc_defer_destroy = defer;
3140         if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_DESTROY, &zc) != 0 &&
3141             errno != ENOENT) {
3142                 return (zfs_standard_error_fmt(zhp->zfs_hdl, errno,
3143                     dgettext(TEXT_DOMAIN, "cannot destroy '%s'"),
3144                     zhp->zfs_name));
3145         }
3146
3147         remove_mountpoint(zhp);
3148
3149         return (0);
3150 }
3151
3152 struct destroydata {
3153         nvlist_t *nvl;
3154         const char *snapname;
3155 };
3156
3157 static int
3158 zfs_check_snap_cb(zfs_handle_t *zhp, void *arg)
3159 {
3160         struct destroydata *dd = arg;
3161         char name[ZFS_MAXNAMELEN];
3162         int rv = 0;
3163
3164         (void) snprintf(name, sizeof (name),
3165             "%s@%s", zhp->zfs_name, dd->snapname);
3166
3167         if (lzc_exists(name))
3168                 verify(nvlist_add_boolean(dd->nvl, name) == 0);
3169
3170         if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
3171                 (void) zvol_remove_link(zhp->zfs_hdl, name);
3172                 /*
3173                  * NB: this is simply a best-effort.  We don't want to
3174                  * return an error, because then we wouldn't visit all
3175                  * the volumes.
3176                  */
3177         }
3178
3179         rv = zfs_iter_filesystems(zhp, zfs_check_snap_cb, dd);
3180         zfs_close(zhp);
3181         return (rv);
3182 }
3183
3184 /*
3185  * Destroys all snapshots with the given name in zhp & descendants.
3186  */
3187 int
3188 zfs_destroy_snaps(zfs_handle_t *zhp, char *snapname, boolean_t defer)
3189 {
3190         int ret;
3191         struct destroydata dd = { 0 };
3192
3193         dd.snapname = snapname;
3194         verify(nvlist_alloc(&dd.nvl, NV_UNIQUE_NAME, 0) == 0);
3195         (void) zfs_check_snap_cb(zfs_handle_dup(zhp), &dd);
3196
3197         if (nvlist_empty(dd.nvl)) {
3198                 ret = zfs_standard_error_fmt(zhp->zfs_hdl, ENOENT,
3199                     dgettext(TEXT_DOMAIN, "cannot destroy '%s@%s'"),
3200                     zhp->zfs_name, snapname);
3201         } else {
3202                 ret = zfs_destroy_snaps_nvl(zhp->zfs_hdl, dd.nvl, defer);
3203         }
3204         nvlist_free(dd.nvl);
3205         return (ret);
3206 }
3207
3208 /*
3209  * Destroys all the snapshots named in the nvlist.
3210  */
3211 int
3212 zfs_destroy_snaps_nvl(libzfs_handle_t *hdl, nvlist_t *snaps, boolean_t defer)
3213 {
3214         int ret;
3215         nvlist_t *errlist;
3216         nvpair_t *pair;
3217
3218         ret = lzc_destroy_snaps(snaps, defer, &errlist);
3219
3220         if (ret == 0)
3221                 return (0);
3222
3223         if (nvlist_empty(errlist)) {
3224                 char errbuf[1024];
3225                 (void) snprintf(errbuf, sizeof (errbuf),
3226                     dgettext(TEXT_DOMAIN, "cannot destroy snapshots"));
3227
3228                 ret = zfs_standard_error(hdl, ret, errbuf);
3229         }
3230         for (pair = nvlist_next_nvpair(errlist, NULL);
3231             pair != NULL; pair = nvlist_next_nvpair(errlist, pair)) {
3232                 char errbuf[1024];
3233                 (void) snprintf(errbuf, sizeof (errbuf),
3234                     dgettext(TEXT_DOMAIN, "cannot destroy snapshot %s"),
3235                     nvpair_name(pair));
3236
3237                 switch (fnvpair_value_int32(pair)) {
3238                 case EEXIST:
3239                         zfs_error_aux(hdl,
3240                             dgettext(TEXT_DOMAIN, "snapshot is cloned"));
3241                         ret = zfs_error(hdl, EZFS_EXISTS, errbuf);
3242                         break;
3243                 default:
3244                         ret = zfs_standard_error(hdl, errno, errbuf);
3245                         break;
3246                 }
3247         }
3248
3249         return (ret);
3250 }
3251
3252 /*
3253  * Clones the given dataset.  The target must be of the same type as the source.
3254  */
3255 int
3256 zfs_clone(zfs_handle_t *zhp, const char *target, nvlist_t *props)
3257 {
3258         char parent[ZFS_MAXNAMELEN];
3259         int ret;
3260         char errbuf[1024];
3261         libzfs_handle_t *hdl = zhp->zfs_hdl;
3262         uint64_t zoned;
3263
3264         assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
3265
3266         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3267             "cannot create '%s'"), target);
3268
3269         /* validate the target/clone name */
3270         if (!zfs_validate_name(hdl, target, ZFS_TYPE_FILESYSTEM, B_TRUE))
3271                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3272
3273         /* validate parents exist */
3274         if (check_parents(hdl, target, &zoned, B_FALSE, NULL) != 0)
3275                 return (-1);
3276
3277         (void) parent_name(target, parent, sizeof (parent));
3278
3279         /* do the clone */
3280
3281         if (props) {
3282                 zfs_type_t type;
3283                 if (ZFS_IS_VOLUME(zhp)) {
3284                         type = ZFS_TYPE_VOLUME;
3285                 } else {
3286                         type = ZFS_TYPE_FILESYSTEM;
3287                 }
3288                 if ((props = zfs_valid_proplist(hdl, type, props, zoned,
3289                     zhp, errbuf)) == NULL)
3290                         return (-1);
3291         }
3292
3293         ret = lzc_clone(target, zhp->zfs_name, props);
3294         nvlist_free(props);
3295
3296         if (ret != 0) {
3297                 switch (errno) {
3298
3299                 case ENOENT:
3300                         /*
3301                          * The parent doesn't exist.  We should have caught this
3302                          * above, but there may a race condition that has since
3303                          * destroyed the parent.
3304                          *
3305                          * At this point, we don't know whether it's the source
3306                          * that doesn't exist anymore, or whether the target
3307                          * dataset doesn't exist.
3308                          */
3309                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
3310                             "no such parent '%s'"), parent);
3311                         return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
3312
3313                 case EXDEV:
3314                         zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
3315                             "source and target pools differ"));
3316                         return (zfs_error(zhp->zfs_hdl, EZFS_CROSSTARGET,
3317                             errbuf));
3318
3319                 default:
3320                         return (zfs_standard_error(zhp->zfs_hdl, errno,
3321                             errbuf));
3322                 }
3323         } else if (ZFS_IS_VOLUME(zhp)) {
3324                 ret = zvol_create_link(zhp->zfs_hdl, target);
3325         }
3326
3327         return (ret);
3328 }
3329
3330 typedef struct promote_data {
3331         char cb_mountpoint[MAXPATHLEN];
3332         const char *cb_target;
3333         const char *cb_errbuf;
3334         uint64_t cb_pivot_txg;
3335 } promote_data_t;
3336
3337 static int
3338 promote_snap_cb(zfs_handle_t *zhp, void *data)
3339 {
3340         promote_data_t *pd = data;
3341         zfs_handle_t *szhp;
3342         char snapname[MAXPATHLEN];
3343         int rv = 0;
3344
3345         /* We don't care about snapshots after the pivot point */
3346         if (zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) > pd->cb_pivot_txg) {
3347                 zfs_close(zhp);
3348                 return (0);
3349         }
3350
3351         /* Remove the device link if it's a zvol. */
3352         if (ZFS_IS_VOLUME(zhp))
3353                 (void) zvol_remove_link(zhp->zfs_hdl, zhp->zfs_name);
3354
3355         /* Check for conflicting names */
3356         (void) strlcpy(snapname, pd->cb_target, sizeof (snapname));
3357         (void) strlcat(snapname, strchr(zhp->zfs_name, '@'), sizeof (snapname));
3358         szhp = make_dataset_handle(zhp->zfs_hdl, snapname);
3359         if (szhp != NULL) {
3360                 zfs_close(szhp);
3361                 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
3362                     "snapshot name '%s' from origin \n"
3363                     "conflicts with '%s' from target"),
3364                     zhp->zfs_name, snapname);
3365                 rv = zfs_error(zhp->zfs_hdl, EZFS_EXISTS, pd->cb_errbuf);
3366         }
3367         zfs_close(zhp);
3368         return (rv);
3369 }
3370
3371 static int
3372 promote_snap_done_cb(zfs_handle_t *zhp, void *data)
3373 {
3374         promote_data_t *pd = data;
3375
3376         /* We don't care about snapshots after the pivot point */
3377         if (zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) <= pd->cb_pivot_txg) {
3378                 /* Create the device link if it's a zvol. */
3379                 if (ZFS_IS_VOLUME(zhp))
3380                         (void) zvol_create_link(zhp->zfs_hdl, zhp->zfs_name);
3381         }
3382
3383         zfs_close(zhp);
3384         return (0);
3385 }
3386
3387 /*
3388  * Promotes the given clone fs to be the clone parent.
3389  */
3390 int
3391 zfs_promote(zfs_handle_t *zhp)
3392 {
3393         libzfs_handle_t *hdl = zhp->zfs_hdl;
3394         zfs_cmd_t zc = {"\0"};
3395         char parent[MAXPATHLEN];
3396         char *cp;
3397         int ret;
3398         zfs_handle_t *pzhp;
3399         promote_data_t pd;
3400         char errbuf[1024];
3401
3402         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3403             "cannot promote '%s'"), zhp->zfs_name);
3404
3405         if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
3406                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3407                     "snapshots can not be promoted"));
3408                 return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3409         }
3410
3411         (void) strlcpy(parent, zhp->zfs_dmustats.dds_origin, sizeof (parent));
3412         if (parent[0] == '\0') {
3413                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3414                     "not a cloned filesystem"));
3415                 return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3416         }
3417         cp = strchr(parent, '@');
3418         *cp = '\0';
3419
3420         /* Walk the snapshots we will be moving */
3421         pzhp = zfs_open(hdl, zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT);
3422         if (pzhp == NULL)
3423                 return (-1);
3424         pd.cb_pivot_txg = zfs_prop_get_int(pzhp, ZFS_PROP_CREATETXG);
3425         zfs_close(pzhp);
3426         pd.cb_target = zhp->zfs_name;
3427         pd.cb_errbuf = errbuf;
3428         pzhp = zfs_open(hdl, parent, ZFS_TYPE_DATASET);
3429         if (pzhp == NULL)
3430                 return (-1);
3431         (void) zfs_prop_get(pzhp, ZFS_PROP_MOUNTPOINT, pd.cb_mountpoint,
3432             sizeof (pd.cb_mountpoint), NULL, NULL, 0, FALSE);
3433         ret = zfs_iter_snapshots(pzhp, B_FALSE, promote_snap_cb, &pd);
3434         if (ret != 0) {
3435                 zfs_close(pzhp);
3436                 return (-1);
3437         }
3438
3439         /* issue the ioctl */
3440         (void) strlcpy(zc.zc_value, zhp->zfs_dmustats.dds_origin,
3441             sizeof (zc.zc_value));
3442         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3443         ret = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
3444
3445         if (ret != 0) {
3446                 int save_errno = errno;
3447
3448                 (void) zfs_iter_snapshots(pzhp, B_FALSE, promote_snap_done_cb,
3449                     &pd);
3450                 zfs_close(pzhp);
3451
3452                 switch (save_errno) {
3453                 case EEXIST:
3454                         /*
3455                          * There is a conflicting snapshot name.  We
3456                          * should have caught this above, but they could
3457                          * have renamed something in the mean time.
3458                          */
3459                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3460                             "conflicting snapshot '%s' from parent '%s'"),
3461                             zc.zc_string, parent);
3462                         return (zfs_error(hdl, EZFS_EXISTS, errbuf));
3463
3464                 default:
3465                         return (zfs_standard_error(hdl, save_errno, errbuf));
3466                 }
3467         } else {
3468                 (void) zfs_iter_snapshots(zhp, B_FALSE, promote_snap_done_cb,
3469                     &pd);
3470         }
3471
3472         zfs_close(pzhp);
3473         return (ret);
3474 }
3475
3476 struct createdata {
3477         const char *cd_snapname;
3478         int cd_ifexists;
3479 };
3480
3481 static int
3482 zfs_create_link_cb(zfs_handle_t *zhp, void *arg)
3483 {
3484         struct createdata *cd = arg;
3485         int ret;
3486
3487         if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
3488                 char name[MAXPATHLEN];
3489
3490                 (void) strlcpy(name, zhp->zfs_name, sizeof (name));
3491                 (void) strlcat(name, "@", sizeof (name));
3492                 (void) strlcat(name, cd->cd_snapname, sizeof (name));
3493                 (void) zvol_create_link_common(zhp->zfs_hdl, name,
3494                     cd->cd_ifexists);
3495                 /*
3496                  * NB: this is simply a best-effort.  We don't want to
3497                  * return an error, because then we wouldn't visit all
3498                  * the volumes.
3499                  */
3500         }
3501
3502         ret = zfs_iter_filesystems(zhp, zfs_create_link_cb, cd);
3503
3504         zfs_close(zhp);
3505
3506         return (ret);
3507 }
3508
3509 typedef struct snapdata {
3510         nvlist_t *sd_nvl;
3511         const char *sd_snapname;
3512 } snapdata_t;
3513
3514 static int
3515 zfs_snapshot_cb(zfs_handle_t *zhp, void *arg)
3516 {
3517         snapdata_t *sd = arg;
3518         char name[ZFS_MAXNAMELEN];
3519         int rv = 0;
3520
3521         if (zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT) == 0) {
3522                 (void) snprintf(name, sizeof (name),
3523                     "%s@%s", zfs_get_name(zhp), sd->sd_snapname);
3524
3525                 fnvlist_add_boolean(sd->sd_nvl, name);
3526
3527                 rv = zfs_iter_filesystems(zhp, zfs_snapshot_cb, sd);
3528         }
3529         zfs_close(zhp);
3530
3531         return (rv);
3532 }
3533
3534 /*
3535  * Creates snapshots.  The keys in the snaps nvlist are the snapshots to be
3536  * created.
3537  */
3538 int
3539 zfs_snapshot_nvl(libzfs_handle_t *hdl, nvlist_t *snaps, nvlist_t *props)
3540 {
3541         int ret;
3542         char errbuf[1024];
3543         nvpair_t *elem;
3544         nvlist_t *errors;
3545
3546         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3547             "cannot create snapshots "));
3548
3549         elem = NULL;
3550         while ((elem = nvlist_next_nvpair(snaps, elem)) != NULL) {
3551                 const char *snapname = nvpair_name(elem);
3552
3553                 /* validate the target name */
3554                 if (!zfs_validate_name(hdl, snapname, ZFS_TYPE_SNAPSHOT,
3555                     B_TRUE)) {
3556                         (void) snprintf(errbuf, sizeof (errbuf),
3557                             dgettext(TEXT_DOMAIN,
3558                             "cannot create snapshot '%s'"), snapname);
3559                         return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3560                 }
3561         }
3562
3563         if (props != NULL &&
3564             (props = zfs_valid_proplist(hdl, ZFS_TYPE_SNAPSHOT,
3565             props, B_FALSE, NULL, errbuf)) == NULL) {
3566                 return (-1);
3567         }
3568
3569         ret = lzc_snapshot(snaps, props, &errors);
3570
3571         if (ret != 0) {
3572                 boolean_t printed = B_FALSE;
3573                 for (elem = nvlist_next_nvpair(errors, NULL);
3574                     elem != NULL;
3575                     elem = nvlist_next_nvpair(errors, elem)) {
3576                         (void) snprintf(errbuf, sizeof (errbuf),
3577                             dgettext(TEXT_DOMAIN,
3578                             "cannot create snapshot '%s'"), nvpair_name(elem));
3579                         (void) zfs_standard_error(hdl,
3580                             fnvpair_value_int32(elem), errbuf);
3581                         printed = B_TRUE;
3582                 }
3583                 if (!printed) {
3584                         switch (ret) {
3585                         case EXDEV:
3586                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3587                                     "multiple snapshots of same "
3588                                     "fs not allowed"));
3589                                 (void) zfs_error(hdl, EZFS_EXISTS, errbuf);
3590
3591                                 break;
3592                         default:
3593                                 (void) zfs_standard_error(hdl, ret, errbuf);
3594                         }
3595                 }
3596         } else {
3597                 zfs_handle_t *zhp;
3598                 int linktries = 0, linkok = 0, linkfail = 0;
3599                 nvpair_t *snap;
3600
3601                 for (snap = nvlist_next_nvpair(snaps, NULL); snap != NULL;
3602                     snap = nvlist_next_nvpair(snaps, snap)) {
3603                         char *cp, *snapname;
3604
3605                         snapname = nvpair_name(snap);
3606                         cp = strchr(snapname, '@');
3607                         *cp = '\0';
3608
3609                         if ((zhp = zfs_open(hdl, snapname, ZFS_TYPE_FILESYSTEM |
3610                                 ZFS_TYPE_VOLUME)) != NULL) {
3611                                 if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
3612                                         ++linktries;
3613                                         *cp = '@';
3614                                         if (zvol_create_link(zhp->zfs_hdl, nvpair_name(snap)))
3615                                                 ++linkfail;
3616                                         else
3617                                                 ++linkok;
3618                                 }
3619                         }
3620                 }
3621         }
3622
3623         nvlist_free(props);
3624         nvlist_free(errors);
3625         return (ret);
3626 }
3627
3628 int
3629 zfs_snapshot(libzfs_handle_t *hdl, const char *path, boolean_t recursive,
3630     nvlist_t *props)
3631 {
3632         int ret;
3633         snapdata_t sd = { 0 };
3634         char fsname[ZFS_MAXNAMELEN];
3635         char *cp;
3636         zfs_handle_t *zhp;
3637         char errbuf[1024];
3638
3639         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3640             "cannot snapshot %s"), path);
3641
3642         if (!zfs_validate_name(hdl, path, ZFS_TYPE_SNAPSHOT, B_TRUE))
3643                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3644
3645         (void) strlcpy(fsname, path, sizeof (fsname));
3646         cp = strchr(fsname, '@');
3647         *cp = '\0';
3648         sd.sd_snapname = cp + 1;
3649
3650         if ((zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM |
3651             ZFS_TYPE_VOLUME)) == NULL) {
3652                 return (-1);
3653         }
3654
3655         verify(nvlist_alloc(&sd.sd_nvl, NV_UNIQUE_NAME, 0) == 0);
3656         if (recursive) {
3657                 (void) zfs_snapshot_cb(zfs_handle_dup(zhp), &sd);
3658         } else {
3659                 fnvlist_add_boolean(sd.sd_nvl, path);
3660         }
3661
3662         ret = zfs_snapshot_nvl(hdl, sd.sd_nvl, props);
3663         nvlist_free(sd.sd_nvl);
3664         zfs_close(zhp);
3665         return (ret);
3666 }
3667
3668 /*
3669  * Destroy any more recent snapshots.  We invoke this callback on any dependents
3670  * of the snapshot first.  If the 'cb_dependent' member is non-zero, then this
3671  * is a dependent and we should just destroy it without checking the transaction
3672  * group.
3673  */
3674 typedef struct rollback_data {
3675         const char      *cb_target;             /* the snapshot */
3676         uint64_t        cb_create;              /* creation time reference */
3677         boolean_t       cb_error;
3678         boolean_t       cb_dependent;
3679         boolean_t       cb_force;
3680 } rollback_data_t;
3681
3682 static int
3683 rollback_destroy(zfs_handle_t *zhp, void *data)
3684 {
3685         rollback_data_t *cbp = data;
3686
3687         if (!cbp->cb_dependent) {
3688                 if (strcmp(zhp->zfs_name, cbp->cb_target) != 0 &&
3689                     zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
3690                     zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG) >
3691                     cbp->cb_create) {
3692
3693                         cbp->cb_dependent = B_TRUE;
3694                         cbp->cb_error |= zfs_iter_dependents(zhp, B_FALSE,
3695                             rollback_destroy, cbp);
3696                         cbp->cb_dependent = B_FALSE;
3697
3698                         cbp->cb_error |= zfs_destroy(zhp, B_FALSE);
3699                 }
3700         } else {
3701                 /* We must destroy this clone; first unmount it */
3702                 prop_changelist_t *clp;
3703
3704                 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
3705                     cbp->cb_force ? MS_FORCE: 0);
3706                 if (clp == NULL || changelist_prefix(clp) != 0) {
3707                         cbp->cb_error = B_TRUE;
3708                         zfs_close(zhp);
3709                         return (0);
3710                 }
3711                 if (zfs_destroy(zhp, B_FALSE) != 0)
3712                         cbp->cb_error = B_TRUE;
3713                 else
3714                         changelist_remove(clp, zhp->zfs_name);
3715                 (void) changelist_postfix(clp);
3716                 changelist_free(clp);
3717         }
3718
3719         zfs_close(zhp);
3720         return (0);
3721 }
3722
3723 /*
3724  * Given a dataset, rollback to a specific snapshot, discarding any
3725  * data changes since then and making it the active dataset.
3726  *
3727  * Any snapshots more recent than the target are destroyed, along with
3728  * their dependents.
3729  */
3730 int
3731 zfs_rollback(zfs_handle_t *zhp, zfs_handle_t *snap, boolean_t force)
3732 {
3733         rollback_data_t cb = { 0 };
3734         int err;
3735         boolean_t restore_resv = 0;
3736         uint64_t old_volsize = 0, new_volsize;
3737         zfs_prop_t resv_prop = { 0 };
3738
3739         assert(zhp->zfs_type == ZFS_TYPE_FILESYSTEM ||
3740             zhp->zfs_type == ZFS_TYPE_VOLUME);
3741
3742         /*
3743          * Destroy all recent snapshots and their dependents.
3744          */
3745         cb.cb_force = force;
3746         cb.cb_target = snap->zfs_name;
3747         cb.cb_create = zfs_prop_get_int(snap, ZFS_PROP_CREATETXG);
3748         (void) zfs_iter_children(zhp, rollback_destroy, &cb);
3749
3750         if (cb.cb_error)
3751                 return (-1);
3752
3753         /*
3754          * Now that we have verified that the snapshot is the latest,
3755          * rollback to the given snapshot.
3756          */
3757
3758         if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
3759                 if (zvol_remove_link(zhp->zfs_hdl, zhp->zfs_name) != 0)
3760                         return (-1);
3761                 if (zfs_which_resv_prop(zhp, &resv_prop) < 0)
3762                         return (-1);
3763                 old_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
3764                 restore_resv =
3765                     (old_volsize == zfs_prop_get_int(zhp, resv_prop));
3766         }
3767
3768         /*
3769          * We rely on zfs_iter_children() to verify that there are no
3770          * newer snapshots for the given dataset.  Therefore, we can
3771          * simply pass the name on to the ioctl() call.  There is still
3772          * an unlikely race condition where the user has taken a
3773          * snapshot since we verified that this was the most recent.
3774          */
3775         err = lzc_rollback(zhp->zfs_name, NULL, 0);
3776         if (err != 0) {
3777                 (void) zfs_standard_error_fmt(zhp->zfs_hdl, errno,
3778                     dgettext(TEXT_DOMAIN, "cannot rollback '%s'"),
3779                     zhp->zfs_name);
3780                 return (err);
3781         }
3782
3783         /*
3784          * For volumes, if the pre-rollback volsize matched the pre-
3785          * rollback reservation and the volsize has changed then set
3786          * the reservation property to the post-rollback volsize.
3787          * Make a new handle since the rollback closed the dataset.
3788          */
3789         if ((zhp->zfs_type == ZFS_TYPE_VOLUME) &&
3790             (zhp = make_dataset_handle(zhp->zfs_hdl, zhp->zfs_name))) {
3791                 if ((err = zvol_create_link(zhp->zfs_hdl, zhp->zfs_name))) {
3792                         zfs_close(zhp);
3793                         return (err);
3794                 }
3795                 if (restore_resv) {
3796                         new_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
3797                         if (old_volsize != new_volsize)
3798                                 err = zfs_prop_set_int(zhp, resv_prop,
3799                                     new_volsize);
3800                 }
3801                 zfs_close(zhp);
3802         }
3803         return (err);
3804 }
3805
3806 /*
3807  * Renames the given dataset.
3808  */
3809 int
3810 zfs_rename(zfs_handle_t *zhp, const char *target, boolean_t recursive,
3811     boolean_t force_unmount)
3812 {
3813         int ret;
3814         zfs_cmd_t zc = {"\0"};
3815         char *delim;
3816         prop_changelist_t *cl = NULL;
3817         zfs_handle_t *zhrp = NULL;
3818         char *parentname = NULL;
3819         char parent[ZFS_MAXNAMELEN];
3820         libzfs_handle_t *hdl = zhp->zfs_hdl;
3821         char errbuf[1024];
3822
3823         /* if we have the same exact name, just return success */
3824         if (strcmp(zhp->zfs_name, target) == 0)
3825                 return (0);
3826
3827         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3828             "cannot rename to '%s'"), target);
3829
3830         /*
3831          * Make sure the target name is valid
3832          */
3833         if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
3834                 if ((strchr(target, '@') == NULL) ||
3835                     *target == '@') {
3836                         /*
3837                          * Snapshot target name is abbreviated,
3838                          * reconstruct full dataset name
3839                          */
3840                         (void) strlcpy(parent, zhp->zfs_name,
3841                             sizeof (parent));
3842                         delim = strchr(parent, '@');
3843                         if (strchr(target, '@') == NULL)
3844                                 *(++delim) = '\0';
3845                         else
3846                                 *delim = '\0';
3847                         (void) strlcat(parent, target, sizeof (parent));
3848                         target = parent;
3849                 } else {
3850                         /*
3851                          * Make sure we're renaming within the same dataset.
3852                          */
3853                         delim = strchr(target, '@');
3854                         if (strncmp(zhp->zfs_name, target, delim - target)
3855                             != 0 || zhp->zfs_name[delim - target] != '@') {
3856                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3857                                     "snapshots must be part of same "
3858                                     "dataset"));
3859                                 return (zfs_error(hdl, EZFS_CROSSTARGET,
3860                                     errbuf));
3861                         }
3862                 }
3863                 if (!zfs_validate_name(hdl, target, zhp->zfs_type, B_TRUE))
3864                         return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3865         } else {
3866                 if (recursive) {
3867                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3868                             "recursive rename must be a snapshot"));
3869                         return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
3870                 }
3871
3872                 if (!zfs_validate_name(hdl, target, zhp->zfs_type, B_TRUE))
3873                         return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3874
3875                 /* validate parents */
3876                 if (check_parents(hdl, target, NULL, B_FALSE, NULL) != 0)
3877                         return (-1);
3878
3879                 /* make sure we're in the same pool */
3880                 verify((delim = strchr(target, '/')) != NULL);
3881                 if (strncmp(zhp->zfs_name, target, delim - target) != 0 ||
3882                     zhp->zfs_name[delim - target] != '/') {
3883                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3884                             "datasets must be within same pool"));
3885                         return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
3886                 }
3887
3888                 /* new name cannot be a child of the current dataset name */
3889                 if (is_descendant(zhp->zfs_name, target)) {
3890                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3891                             "New dataset name cannot be a descendant of "
3892                             "current dataset name"));
3893                         return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3894                 }
3895         }
3896
3897         (void) snprintf(errbuf, sizeof (errbuf),
3898             dgettext(TEXT_DOMAIN, "cannot rename '%s'"), zhp->zfs_name);
3899
3900         if (getzoneid() == GLOBAL_ZONEID &&
3901             zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) {
3902                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3903                     "dataset is used in a non-global zone"));
3904                 return (zfs_error(hdl, EZFS_ZONED, errbuf));
3905         }
3906
3907         if (recursive) {
3908                 struct destroydata dd;
3909
3910                 parentname = zfs_strdup(zhp->zfs_hdl, zhp->zfs_name);
3911                 if (parentname == NULL) {
3912                         ret = -1;
3913                         goto error;
3914                 }
3915                 delim = strchr(parentname, '@');
3916                 *delim = '\0';
3917                 zhrp = zfs_open(zhp->zfs_hdl, parentname, ZFS_TYPE_DATASET);
3918                 if (zhrp == NULL) {
3919                         ret = -1;
3920                         goto error;
3921                 }
3922
3923                 dd.snapname = delim + 1;
3924
3925                 /* We remove any zvol links prior to renaming them */
3926                 verify(nvlist_alloc(&dd.nvl, NV_UNIQUE_NAME, 0) == 0);
3927                 ret = zfs_iter_filesystems(zhrp, zfs_check_snap_cb, &dd);
3928                 nvlist_free(dd.nvl);
3929                 if (ret) {
3930                         goto error;
3931                 }
3932         } else {
3933                 if ((cl = changelist_gather(zhp, ZFS_PROP_NAME, 0,
3934                     force_unmount ? MS_FORCE : 0)) == NULL)
3935                         return (-1);
3936
3937                 if (changelist_haszonedchild(cl)) {
3938                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3939                             "child dataset with inherited mountpoint is used "
3940                             "in a non-global zone"));
3941                         (void) zfs_error(hdl, EZFS_ZONED, errbuf);
3942                         ret = -1;
3943                         goto error;
3944                 }
3945
3946                 if ((ret = changelist_prefix(cl)) != 0)
3947                         goto error;
3948         }
3949
3950         if (ZFS_IS_VOLUME(zhp))
3951                 zc.zc_objset_type = DMU_OST_ZVOL;
3952         else
3953                 zc.zc_objset_type = DMU_OST_ZFS;
3954
3955         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
3956         (void) strlcpy(zc.zc_value, target, sizeof (zc.zc_value));
3957
3958         zc.zc_cookie = recursive;
3959
3960         if ((ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_RENAME, &zc)) != 0) {
3961                 /*
3962                  * if it was recursive, the one that actually failed will
3963                  * be in zc.zc_name
3964                  */
3965                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3966                     "cannot rename '%s'"), zc.zc_name);
3967
3968                 if (recursive && errno == EEXIST) {
3969                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3970                             "a child dataset already has a snapshot "
3971                             "with the new name"));
3972                         (void) zfs_error(hdl, EZFS_EXISTS, errbuf);
3973                 } else {
3974                         (void) zfs_standard_error(zhp->zfs_hdl, errno, errbuf);
3975                 }
3976
3977                 /*
3978                  * On failure, we still want to remount any filesystems that
3979                  * were previously mounted, so we don't alter the system state.
3980                  */
3981                 if (recursive) {
3982                         struct createdata cd;
3983
3984                         /* only create links for datasets that had existed */
3985                         cd.cd_snapname = delim + 1;
3986                         cd.cd_ifexists = B_TRUE;
3987                         (void) zfs_iter_filesystems(zhrp, zfs_create_link_cb,
3988                             &cd);
3989                 } else {
3990                         (void) changelist_postfix(cl);
3991                 }
3992         } else {
3993                 if (recursive) {
3994                         struct createdata cd;
3995
3996                         /* only create links for datasets that had existed */
3997                         cd.cd_snapname = strchr(target, '@') + 1;
3998                         cd.cd_ifexists = B_TRUE;
3999                         ret = zfs_iter_filesystems(zhrp, zfs_create_link_cb,
4000                             &cd);
4001                 } else {
4002                         changelist_rename(cl, zfs_get_name(zhp), target);
4003                         ret = changelist_postfix(cl);
4004                 }
4005         }
4006
4007 error:
4008         if (parentname) {
4009                 free(parentname);
4010         }
4011         if (zhrp) {
4012                 zfs_close(zhrp);
4013         }
4014         if (cl) {
4015                 changelist_free(cl);
4016         }
4017         return (ret);
4018 }
4019
4020 /*
4021  * Given a zvol dataset, issue the ioctl to create the appropriate minor node,
4022  * and wait briefly for udev to create the /dev link.
4023  */
4024 int
4025 zvol_create_link(libzfs_handle_t *hdl, const char *dataset)
4026 {
4027         return (zvol_create_link_common(hdl, dataset, B_FALSE));
4028 }
4029
4030 static int
4031 zvol_create_link_common(libzfs_handle_t *hdl, const char *dataset, int ifexists)
4032 {
4033         zfs_cmd_t zc = {"\0"};
4034         char path[MAXPATHLEN];
4035         int error;
4036
4037         (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
4038
4039         /*
4040          * Issue the appropriate ioctl.
4041          */
4042         if (ioctl(hdl->libzfs_fd, ZFS_IOC_CREATE_MINOR, &zc) != 0) {
4043                 switch (errno) {
4044                 case EEXIST:
4045                         /*
4046                          * Silently ignore the case where the link already
4047                          * exists.  This allows 'zfs volinit' to be run multiple
4048                          * times without errors.
4049                          */
4050                         return (0);
4051
4052                 case ENODEV:
4053                         /*
4054                          * snapdev set to hidden :
4055                          *  device creation was not permitted (see zvol.c)
4056                          *  ignore error quietly
4057                          */
4058                         return (0);
4059
4060                 case ENOENT:
4061                         /*
4062                          * Dataset does not exist in the kernel.  If we
4063                          * don't care (see zfs_rename), then ignore the
4064                          * error quietly.
4065                          */
4066                         if (ifexists) {
4067                                 return (0);
4068                         }
4069
4070                         /* FALLTHROUGH */
4071
4072                 default:
4073                         return (zfs_standard_error_fmt(hdl, errno,
4074                             dgettext(TEXT_DOMAIN, "cannot create device links "
4075                             "for '%s'"), dataset));
4076                 }
4077         }
4078
4079         /*
4080          * Wait for udev to create the device.
4081          */
4082         (void) snprintf(path, sizeof (path), "%s/%s", ZVOL_DIR, dataset);
4083         error = zpool_label_disk_wait(path, DISK_LABEL_WAIT);
4084         if (error)
4085                 (void) printf(gettext("%s may not be immediately "
4086                     "available\n"), path);
4087
4088         return (0);
4089 }
4090
4091 /*
4092  * Remove a minor node for the given zvol and the associated /dev links.
4093  */
4094 int
4095 zvol_remove_link(libzfs_handle_t *hdl, const char *dataset)
4096 {
4097         zfs_cmd_t zc = {"\0"};
4098         int timeout = 3000; /* in milliseconds */
4099         int error = 0;
4100         int i;
4101
4102         (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
4103
4104         /*
4105          * Due to concurrent updates by udev the device may be reported as
4106          * busy.  In this case don't immediately fail.  Instead briefly delay
4107          * and retry the ioctl() which is now likely to succeed.  If unable
4108          * remove the link after timeout milliseconds return the failure.
4109          */
4110         for (i = 0; i < timeout; i++) {
4111                 error = ioctl(hdl->libzfs_fd, ZFS_IOC_REMOVE_MINOR, &zc);
4112                 if (error && errno == EBUSY) {
4113                         usleep(1000);
4114                         continue;
4115                 } else {
4116                         break;
4117                 }
4118         }
4119
4120         if (error) {
4121                 switch (errno) {
4122                 case ENXIO:
4123                         /*
4124                          * Silently ignore the case where the link no longer
4125                          * exists, so that 'zfs volfini' can be run multiple
4126                          * times without errors.
4127                          */
4128                         return (0);
4129
4130                 default:
4131                         return (zfs_standard_error_fmt(hdl, errno,
4132                             dgettext(TEXT_DOMAIN, "cannot remove device "
4133                             "links for '%s': %s"), dataset, strerror(errno)));
4134                 }
4135         }
4136
4137         return (0);
4138 }
4139
4140 nvlist_t *
4141 zfs_get_user_props(zfs_handle_t *zhp)
4142 {
4143         return (zhp->zfs_user_props);
4144 }
4145
4146 /*
4147  * This function is used by 'zfs list' to determine the exact set of columns to
4148  * display, and their maximum widths.  This does two main things:
4149  *
4150  *      - If this is a list of all properties, then expand the list to include
4151  *        all native properties, and set a flag so that for each dataset we look
4152  *        for new unique user properties and add them to the list.
4153  *
4154  *      - For non fixed-width properties, keep track of the maximum width seen
4155  *        so that we can size the column appropriately. If the user has
4156  *        requested received property values, we also need to compute the width
4157  *        of the RECEIVED column.
4158  */
4159 int
4160 zfs_expand_proplist(zfs_handle_t *zhp, zprop_list_t **plp, boolean_t received)
4161 {
4162         libzfs_handle_t *hdl = zhp->zfs_hdl;
4163         zprop_list_t *entry;
4164         zprop_list_t **last, **start;
4165         nvlist_t *userprops, *propval;
4166         nvpair_t *elem;
4167         char *strval;
4168         char buf[ZFS_MAXPROPLEN];
4169
4170         if (zprop_expand_list(hdl, plp, ZFS_TYPE_DATASET) != 0)
4171                 return (-1);
4172
4173         userprops = zfs_get_user_props(zhp);
4174
4175         entry = *plp;
4176         if (entry->pl_all && nvlist_next_nvpair(userprops, NULL) != NULL) {
4177                 /*
4178                  * Go through and add any user properties as necessary.  We
4179                  * start by incrementing our list pointer to the first
4180                  * non-native property.
4181                  */
4182                 start = plp;
4183                 while (*start != NULL) {
4184                         if ((*start)->pl_prop == ZPROP_INVAL)
4185                                 break;
4186                         start = &(*start)->pl_next;
4187                 }
4188
4189                 elem = NULL;
4190                 while ((elem = nvlist_next_nvpair(userprops, elem)) != NULL) {
4191                         /*
4192                          * See if we've already found this property in our list.
4193                          */
4194                         for (last = start; *last != NULL;
4195                             last = &(*last)->pl_next) {
4196                                 if (strcmp((*last)->pl_user_prop,
4197                                     nvpair_name(elem)) == 0)
4198                                         break;
4199                         }
4200
4201                         if (*last == NULL) {
4202                                 if ((entry = zfs_alloc(hdl,
4203                                     sizeof (zprop_list_t))) == NULL ||
4204                                     ((entry->pl_user_prop = zfs_strdup(hdl,
4205                                     nvpair_name(elem)))) == NULL) {
4206                                         free(entry);
4207                                         return (-1);
4208                                 }
4209
4210                                 entry->pl_prop = ZPROP_INVAL;
4211                                 entry->pl_width = strlen(nvpair_name(elem));
4212                                 entry->pl_all = B_TRUE;
4213                                 *last = entry;
4214                         }
4215                 }
4216         }
4217
4218         /*
4219          * Now go through and check the width of any non-fixed columns
4220          */
4221         for (entry = *plp; entry != NULL; entry = entry->pl_next) {
4222                 if (entry->pl_fixed)
4223                         continue;
4224
4225                 if (entry->pl_prop != ZPROP_INVAL) {
4226                         if (zfs_prop_get(zhp, entry->pl_prop,
4227                             buf, sizeof (buf), NULL, NULL, 0, B_FALSE) == 0) {
4228                                 if (strlen(buf) > entry->pl_width)
4229                                         entry->pl_width = strlen(buf);
4230                         }
4231                         if (received && zfs_prop_get_recvd(zhp,
4232                             zfs_prop_to_name(entry->pl_prop),
4233                             buf, sizeof (buf), B_FALSE) == 0)
4234                                 if (strlen(buf) > entry->pl_recvd_width)
4235                                         entry->pl_recvd_width = strlen(buf);
4236                 } else {
4237                         if (nvlist_lookup_nvlist(userprops, entry->pl_user_prop,
4238                             &propval) == 0) {
4239                                 verify(nvlist_lookup_string(propval,
4240                                     ZPROP_VALUE, &strval) == 0);
4241                                 if (strlen(strval) > entry->pl_width)
4242                                         entry->pl_width = strlen(strval);
4243                         }
4244                         if (received && zfs_prop_get_recvd(zhp,
4245                             entry->pl_user_prop,
4246                             buf, sizeof (buf), B_FALSE) == 0)
4247                                 if (strlen(buf) > entry->pl_recvd_width)
4248                                         entry->pl_recvd_width = strlen(buf);
4249                 }
4250         }
4251
4252         return (0);
4253 }
4254
4255 void
4256 zfs_prune_proplist(zfs_handle_t *zhp, uint8_t *props)
4257 {
4258         nvpair_t *curr;
4259
4260         /*
4261          * Keep a reference to the props-table against which we prune the
4262          * properties.
4263          */
4264         zhp->zfs_props_table = props;
4265
4266         curr = nvlist_next_nvpair(zhp->zfs_props, NULL);
4267
4268         while (curr) {
4269                 zfs_prop_t zfs_prop = zfs_name_to_prop(nvpair_name(curr));
4270                 nvpair_t *next = nvlist_next_nvpair(zhp->zfs_props, curr);
4271
4272                 /*
4273                  * User properties will result in ZPROP_INVAL, and since we
4274                  * only know how to prune standard ZFS properties, we always
4275                  * leave these in the list.  This can also happen if we
4276                  * encounter an unknown DSL property (when running older
4277                  * software, for example).
4278                  */
4279                 if (zfs_prop != ZPROP_INVAL && props[zfs_prop] == B_FALSE)
4280                         (void) nvlist_remove(zhp->zfs_props,
4281                             nvpair_name(curr), nvpair_type(curr));
4282                 curr = next;
4283         }
4284 }
4285
4286 static int
4287 zfs_smb_acl_mgmt(libzfs_handle_t *hdl, char *dataset, char *path,
4288     zfs_smb_acl_op_t cmd, char *resource1, char *resource2)
4289 {
4290         zfs_cmd_t zc = {"\0"};
4291         nvlist_t *nvlist = NULL;
4292         int error;
4293
4294         (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name));
4295         (void) strlcpy(zc.zc_value, path, sizeof (zc.zc_value));
4296         zc.zc_cookie = (uint64_t)cmd;
4297
4298         if (cmd == ZFS_SMB_ACL_RENAME) {
4299                 if (nvlist_alloc(&nvlist, NV_UNIQUE_NAME, 0) != 0) {
4300                         (void) no_memory(hdl);
4301                         return (-1);
4302                 }
4303         }
4304
4305         switch (cmd) {
4306         case ZFS_SMB_ACL_ADD:
4307         case ZFS_SMB_ACL_REMOVE:
4308                 (void) strlcpy(zc.zc_string, resource1, sizeof (zc.zc_string));
4309                 break;
4310         case ZFS_SMB_ACL_RENAME:
4311                 if (nvlist_add_string(nvlist, ZFS_SMB_ACL_SRC,
4312                     resource1) != 0) {
4313                                 (void) no_memory(hdl);
4314                                 return (-1);
4315                 }
4316                 if (nvlist_add_string(nvlist, ZFS_SMB_ACL_TARGET,
4317                     resource2) != 0) {
4318                                 (void) no_memory(hdl);
4319                                 return (-1);
4320                 }
4321                 if (zcmd_write_src_nvlist(hdl, &zc, nvlist) != 0) {
4322                         nvlist_free(nvlist);
4323                         return (-1);
4324                 }
4325                 break;
4326         case ZFS_SMB_ACL_PURGE:
4327                 break;
4328         default:
4329                 return (-1);
4330         }
4331         error = ioctl(hdl->libzfs_fd, ZFS_IOC_SMB_ACL, &zc);
4332         if (nvlist)
4333                 nvlist_free(nvlist);
4334         return (error);
4335 }
4336
4337 int
4338 zfs_smb_acl_add(libzfs_handle_t *hdl, char *dataset,
4339     char *path, char *resource)
4340 {
4341         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_ADD,
4342             resource, NULL));
4343 }
4344
4345 int
4346 zfs_smb_acl_remove(libzfs_handle_t *hdl, char *dataset,
4347     char *path, char *resource)
4348 {
4349         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_REMOVE,
4350             resource, NULL));
4351 }
4352
4353 int
4354 zfs_smb_acl_purge(libzfs_handle_t *hdl, char *dataset, char *path)
4355 {
4356         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_PURGE,
4357             NULL, NULL));
4358 }
4359
4360 int
4361 zfs_smb_acl_rename(libzfs_handle_t *hdl, char *dataset, char *path,
4362     char *oldname, char *newname)
4363 {
4364         return (zfs_smb_acl_mgmt(hdl, dataset, path, ZFS_SMB_ACL_RENAME,
4365             oldname, newname));
4366 }
4367
4368 int
4369 zfs_userspace(zfs_handle_t *zhp, zfs_userquota_prop_t type,
4370     zfs_userspace_cb_t func, void *arg)
4371 {
4372         zfs_cmd_t zc = {"\0"};
4373         zfs_useracct_t buf[100];
4374         libzfs_handle_t *hdl = zhp->zfs_hdl;
4375         int ret;
4376
4377         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
4378
4379         zc.zc_objset_type = type;
4380         zc.zc_nvlist_dst = (uintptr_t)buf;
4381
4382         for (;;) {
4383                 zfs_useracct_t *zua = buf;
4384
4385                 zc.zc_nvlist_dst_size = sizeof (buf);
4386                 if (zfs_ioctl(hdl, ZFS_IOC_USERSPACE_MANY, &zc) != 0) {
4387                         char errbuf[ZFS_MAXNAMELEN + 32];
4388
4389                         (void) snprintf(errbuf, sizeof (errbuf),
4390                             dgettext(TEXT_DOMAIN,
4391                             "cannot get used/quota for %s"), zc.zc_name);
4392                         return (zfs_standard_error_fmt(hdl, errno, errbuf));
4393                 }
4394                 if (zc.zc_nvlist_dst_size == 0)
4395                         break;
4396
4397                 while (zc.zc_nvlist_dst_size > 0) {
4398                         if ((ret = func(arg, zua->zu_domain, zua->zu_rid,
4399                             zua->zu_space)) != 0)
4400                                 return (ret);
4401                         zua++;
4402                         zc.zc_nvlist_dst_size -= sizeof (zfs_useracct_t);
4403                 }
4404         }
4405
4406         return (0);
4407 }
4408
4409 struct holdarg {
4410         nvlist_t *nvl;
4411         const char *snapname;
4412         const char *tag;
4413         boolean_t recursive;
4414         int error;
4415 };
4416
4417 static int
4418 zfs_hold_one(zfs_handle_t *zhp, void *arg)
4419 {
4420         struct holdarg *ha = arg;
4421         char name[ZFS_MAXNAMELEN];
4422         int rv = 0;
4423
4424         (void) snprintf(name, sizeof (name),
4425             "%s@%s", zhp->zfs_name, ha->snapname);
4426
4427         if (lzc_exists(name))
4428                 fnvlist_add_string(ha->nvl, name, ha->tag);
4429
4430         if (ha->recursive)
4431                 rv = zfs_iter_filesystems(zhp, zfs_hold_one, ha);
4432         zfs_close(zhp);
4433         return (rv);
4434 }
4435
4436 int
4437 zfs_hold(zfs_handle_t *zhp, const char *snapname, const char *tag,
4438     boolean_t recursive, int cleanup_fd)
4439 {
4440         int ret;
4441         struct holdarg ha;
4442
4443         ha.nvl = fnvlist_alloc();
4444         ha.snapname = snapname;
4445         ha.tag = tag;
4446         ha.recursive = recursive;
4447         (void) zfs_hold_one(zfs_handle_dup(zhp), &ha);
4448
4449         if (nvlist_empty(ha.nvl)) {
4450                 char errbuf[1024];
4451
4452                 fnvlist_free(ha.nvl);
4453                 ret = ENOENT;
4454                 (void) snprintf(errbuf, sizeof (errbuf),
4455                     dgettext(TEXT_DOMAIN,
4456                     "cannot hold snapshot '%s@%s'"),
4457                     zhp->zfs_name, snapname);
4458                 (void) zfs_standard_error(zhp->zfs_hdl, ret, errbuf);
4459                 return (ret);
4460         }
4461
4462         ret = zfs_hold_nvl(zhp, cleanup_fd, ha.nvl);
4463         fnvlist_free(ha.nvl);
4464
4465         return (ret);
4466 }
4467
4468 int
4469 zfs_hold_nvl(zfs_handle_t *zhp, int cleanup_fd, nvlist_t *holds)
4470 {
4471         int ret;
4472         nvlist_t *errors;
4473         libzfs_handle_t *hdl = zhp->zfs_hdl;
4474         char errbuf[1024];
4475         nvpair_t *elem;
4476
4477         errors = NULL;
4478         ret = lzc_hold(holds, cleanup_fd, &errors);
4479
4480         if (ret == 0) {
4481                 /* There may be errors even in the success case. */
4482                 fnvlist_free(errors);
4483                 return (0);
4484         }
4485
4486         if (nvlist_empty(errors)) {
4487                 /* no hold-specific errors */
4488                 (void) snprintf(errbuf, sizeof (errbuf),
4489                     dgettext(TEXT_DOMAIN, "cannot hold"));
4490                 switch (ret) {
4491                 case ENOTSUP:
4492                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4493                             "pool must be upgraded"));
4494                         (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
4495                         break;
4496                 case EINVAL:
4497                         (void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
4498                         break;
4499                 default:
4500                         (void) zfs_standard_error(hdl, ret, errbuf);
4501                 }
4502         }
4503
4504         for (elem = nvlist_next_nvpair(errors, NULL);
4505             elem != NULL;
4506             elem = nvlist_next_nvpair(errors, elem)) {
4507                 (void) snprintf(errbuf, sizeof (errbuf),
4508                     dgettext(TEXT_DOMAIN,
4509                     "cannot hold snapshot '%s'"), nvpair_name(elem));
4510                 switch (fnvpair_value_int32(elem)) {
4511                 case E2BIG:
4512                         /*
4513                          * Temporary tags wind up having the ds object id
4514                          * prepended. So even if we passed the length check
4515                          * above, it's still possible for the tag to wind
4516                          * up being slightly too long.
4517                          */
4518                         (void) zfs_error(hdl, EZFS_TAGTOOLONG, errbuf);
4519                         break;
4520                 case EINVAL:
4521                         (void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
4522                         break;
4523                 case EEXIST:
4524                         (void) zfs_error(hdl, EZFS_REFTAG_HOLD, errbuf);
4525                         break;
4526                 default:
4527                         (void) zfs_standard_error(hdl,
4528                             fnvpair_value_int32(elem), errbuf);
4529                 }
4530         }
4531
4532         fnvlist_free(errors);
4533         return (ret);
4534 }
4535
4536 static int
4537 zfs_release_one(zfs_handle_t *zhp, void *arg)
4538 {
4539         struct holdarg *ha = arg;
4540         char name[ZFS_MAXNAMELEN];
4541         int rv = 0;
4542         nvlist_t *existing_holds;
4543
4544         (void) snprintf(name, sizeof (name),
4545             "%s@%s", zhp->zfs_name, ha->snapname);
4546
4547         if (lzc_get_holds(name, &existing_holds) != 0) {
4548                 ha->error = ENOENT;
4549         } else if (!nvlist_exists(existing_holds, ha->tag)) {
4550                 ha->error = ESRCH;
4551         } else {
4552                 nvlist_t *torelease = fnvlist_alloc();
4553                 fnvlist_add_boolean(torelease, ha->tag);
4554                 fnvlist_add_nvlist(ha->nvl, name, torelease);
4555                 fnvlist_free(torelease);
4556         }
4557
4558         if (ha->recursive)
4559                 rv = zfs_iter_filesystems(zhp, zfs_release_one, ha);
4560         zfs_close(zhp);
4561         return (rv);
4562 }
4563
4564 int
4565 zfs_release(zfs_handle_t *zhp, const char *snapname, const char *tag,
4566     boolean_t recursive)
4567 {
4568         int ret;
4569         struct holdarg ha;
4570         nvlist_t *errors = NULL;
4571         nvpair_t *elem;
4572         libzfs_handle_t *hdl = zhp->zfs_hdl;
4573         char errbuf[1024];
4574
4575         ha.nvl = fnvlist_alloc();
4576         ha.snapname = snapname;
4577         ha.tag = tag;
4578         ha.recursive = recursive;
4579         ha.error = 0;
4580         (void) zfs_release_one(zfs_handle_dup(zhp), &ha);
4581
4582         if (nvlist_empty(ha.nvl)) {
4583                 fnvlist_free(ha.nvl);
4584                 ret = ha.error;
4585                 (void) snprintf(errbuf, sizeof (errbuf),
4586                     dgettext(TEXT_DOMAIN,
4587                     "cannot release hold from snapshot '%s@%s'"),
4588                     zhp->zfs_name, snapname);
4589                 if (ret == ESRCH) {
4590                         (void) zfs_error(hdl, EZFS_REFTAG_RELE, errbuf);
4591                 } else {
4592                         (void) zfs_standard_error(hdl, ret, errbuf);
4593                 }
4594                 return (ret);
4595         }
4596
4597         ret = lzc_release(ha.nvl, &errors);
4598         fnvlist_free(ha.nvl);
4599
4600         if (ret == 0) {
4601                 /* There may be errors even in the success case. */
4602                 fnvlist_free(errors);
4603                 return (0);
4604         }
4605
4606         if (nvlist_empty(errors)) {
4607                 /* no hold-specific errors */
4608                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
4609                     "cannot release"));
4610                 switch (errno) {
4611                 case ENOTSUP:
4612                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4613                             "pool must be upgraded"));
4614                         (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
4615                         break;
4616                 default:
4617                         (void) zfs_standard_error_fmt(hdl, errno, errbuf);
4618                 }
4619         }
4620
4621         for (elem = nvlist_next_nvpair(errors, NULL);
4622             elem != NULL;
4623             elem = nvlist_next_nvpair(errors, elem)) {
4624                 (void) snprintf(errbuf, sizeof (errbuf),
4625                     dgettext(TEXT_DOMAIN,
4626                     "cannot release hold from snapshot '%s'"),
4627                     nvpair_name(elem));
4628                 switch (fnvpair_value_int32(elem)) {
4629                 case ESRCH:
4630                         (void) zfs_error(hdl, EZFS_REFTAG_RELE, errbuf);
4631                         break;
4632                 case EINVAL:
4633                         (void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
4634                         break;
4635                 default:
4636                         (void) zfs_standard_error_fmt(hdl,
4637                             fnvpair_value_int32(elem), errbuf);
4638                 }
4639         }
4640
4641         fnvlist_free(errors);
4642         return (ret);
4643 }
4644
4645 int
4646 zfs_get_fsacl(zfs_handle_t *zhp, nvlist_t **nvl)
4647 {
4648         zfs_cmd_t zc = {"\0"};
4649         libzfs_handle_t *hdl = zhp->zfs_hdl;
4650         int nvsz = 2048;
4651         void *nvbuf;
4652         int err = 0;
4653         char errbuf[1024];
4654
4655         assert(zhp->zfs_type == ZFS_TYPE_VOLUME ||
4656             zhp->zfs_type == ZFS_TYPE_FILESYSTEM);
4657
4658 tryagain:
4659
4660         nvbuf = malloc(nvsz);
4661         if (nvbuf == NULL) {
4662                 err = (zfs_error(hdl, EZFS_NOMEM, strerror(errno)));
4663                 goto out;
4664         }
4665
4666         zc.zc_nvlist_dst_size = nvsz;
4667         zc.zc_nvlist_dst = (uintptr_t)nvbuf;
4668
4669         (void) strlcpy(zc.zc_name, zhp->zfs_name, ZFS_MAXNAMELEN);
4670
4671         if (ioctl(hdl->libzfs_fd, ZFS_IOC_GET_FSACL, &zc) != 0) {
4672                 (void) snprintf(errbuf, sizeof (errbuf),
4673                     dgettext(TEXT_DOMAIN, "cannot get permissions on '%s'"),
4674                     zc.zc_name);
4675                 switch (errno) {
4676                 case ENOMEM:
4677                         free(nvbuf);
4678                         nvsz = zc.zc_nvlist_dst_size;
4679                         goto tryagain;
4680
4681                 case ENOTSUP:
4682                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4683                             "pool must be upgraded"));
4684                         err = zfs_error(hdl, EZFS_BADVERSION, errbuf);
4685                         break;
4686                 case EINVAL:
4687                         err = zfs_error(hdl, EZFS_BADTYPE, errbuf);
4688                         break;
4689                 case ENOENT:
4690                         err = zfs_error(hdl, EZFS_NOENT, errbuf);
4691                         break;
4692                 default:
4693                         err = zfs_standard_error_fmt(hdl, errno, errbuf);
4694                         break;
4695                 }
4696         } else {
4697                 /* success */
4698                 int rc = nvlist_unpack(nvbuf, zc.zc_nvlist_dst_size, nvl, 0);
4699                 if (rc) {
4700                         (void) snprintf(errbuf, sizeof (errbuf), dgettext(
4701                             TEXT_DOMAIN, "cannot get permissions on '%s'"),
4702                             zc.zc_name);
4703                         err = zfs_standard_error_fmt(hdl, rc, errbuf);
4704                 }
4705         }
4706
4707         free(nvbuf);
4708 out:
4709         return (err);
4710 }
4711
4712 int
4713 zfs_set_fsacl(zfs_handle_t *zhp, boolean_t un, nvlist_t *nvl)
4714 {
4715         zfs_cmd_t zc = {"\0"};
4716         libzfs_handle_t *hdl = zhp->zfs_hdl;
4717         char *nvbuf;
4718         char errbuf[1024];
4719         size_t nvsz;
4720         int err;
4721
4722         assert(zhp->zfs_type == ZFS_TYPE_VOLUME ||
4723             zhp->zfs_type == ZFS_TYPE_FILESYSTEM);
4724
4725         err = nvlist_size(nvl, &nvsz, NV_ENCODE_NATIVE);
4726         assert(err == 0);
4727
4728         nvbuf = malloc(nvsz);
4729
4730         err = nvlist_pack(nvl, &nvbuf, &nvsz, NV_ENCODE_NATIVE, 0);
4731         assert(err == 0);
4732
4733         zc.zc_nvlist_src_size = nvsz;
4734         zc.zc_nvlist_src = (uintptr_t)nvbuf;
4735         zc.zc_perm_action = un;
4736
4737         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
4738
4739         if (zfs_ioctl(hdl, ZFS_IOC_SET_FSACL, &zc) != 0) {
4740                 (void) snprintf(errbuf, sizeof (errbuf),
4741                     dgettext(TEXT_DOMAIN, "cannot set permissions on '%s'"),
4742                     zc.zc_name);
4743                 switch (errno) {
4744                 case ENOTSUP:
4745                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4746                             "pool must be upgraded"));
4747                         err = zfs_error(hdl, EZFS_BADVERSION, errbuf);
4748                         break;
4749                 case EINVAL:
4750                         err = zfs_error(hdl, EZFS_BADTYPE, errbuf);
4751                         break;
4752                 case ENOENT:
4753                         err = zfs_error(hdl, EZFS_NOENT, errbuf);
4754                         break;
4755                 default:
4756                         err = zfs_standard_error_fmt(hdl, errno, errbuf);
4757                         break;
4758                 }
4759         }
4760
4761         free(nvbuf);
4762
4763         return (err);
4764 }
4765
4766 int
4767 zfs_get_holds(zfs_handle_t *zhp, nvlist_t **nvl)
4768 {
4769         int err;
4770         char errbuf[1024];
4771
4772         err = lzc_get_holds(zhp->zfs_name, nvl);
4773
4774         if (err != 0) {
4775                 libzfs_handle_t *hdl = zhp->zfs_hdl;
4776
4777                 (void) snprintf(errbuf, sizeof (errbuf),
4778                     dgettext(TEXT_DOMAIN, "cannot get holds for '%s'"),
4779                     zhp->zfs_name);
4780                 switch (err) {
4781                 case ENOTSUP:
4782                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4783                             "pool must be upgraded"));
4784                         err = zfs_error(hdl, EZFS_BADVERSION, errbuf);
4785                         break;
4786                 case EINVAL:
4787                         err = zfs_error(hdl, EZFS_BADTYPE, errbuf);
4788                         break;
4789                 case ENOENT:
4790                         err = zfs_error(hdl, EZFS_NOENT, errbuf);
4791                         break;
4792                 default:
4793                         err = zfs_standard_error_fmt(hdl, errno, errbuf);
4794                         break;
4795                 }
4796         }
4797
4798         return (err);
4799 }
4800
4801 /*
4802  * Convert the zvol's volume size to an appropriate reservation.
4803  * Note: If this routine is updated, it is necessary to update the ZFS test
4804  * suite's shell version in reservation.kshlib.
4805  */
4806 uint64_t
4807 zvol_volsize_to_reservation(uint64_t volsize, nvlist_t *props)
4808 {
4809         uint64_t numdb;
4810         uint64_t nblocks, volblocksize;
4811         int ncopies;
4812         char *strval;
4813
4814         if (nvlist_lookup_string(props,
4815             zfs_prop_to_name(ZFS_PROP_COPIES), &strval) == 0)
4816                 ncopies = atoi(strval);
4817         else
4818                 ncopies = 1;
4819         if (nvlist_lookup_uint64(props,
4820             zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
4821             &volblocksize) != 0)
4822                 volblocksize = ZVOL_DEFAULT_BLOCKSIZE;
4823         nblocks = volsize/volblocksize;
4824         /* start with metadnode L0-L6 */
4825         numdb = 7;
4826         /* calculate number of indirects */
4827         while (nblocks > 1) {
4828                 nblocks += DNODES_PER_LEVEL - 1;
4829                 nblocks /= DNODES_PER_LEVEL;
4830                 numdb += nblocks;
4831         }
4832         numdb *= MIN(SPA_DVAS_PER_BP, ncopies + 1);
4833         volsize *= ncopies;
4834         /*
4835          * this is exactly DN_MAX_INDBLKSHIFT when metadata isn't
4836          * compressed, but in practice they compress down to about
4837          * 1100 bytes
4838          */
4839         numdb *= 1ULL << DN_MAX_INDBLKSHIFT;
4840         volsize += numdb;
4841         return (volsize);
4842 }