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 https://opensource.org/licenses/CDDL-1.0. 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 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 * 26 * Portions Copyright 2007 Ramprakash Jelari 27 * Copyright (c) 2014, 2020 by Delphix. All rights reserved. 28 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com> 29 * Copyright (c) 2018 Datto Inc. 30 */ 31 32#include <libintl.h> 33#include <libuutil.h> 34#include <stddef.h> 35#include <stdlib.h> 36#include <string.h> 37#include <unistd.h> 38#include <zone.h> 39 40#include <libzfs.h> 41 42#include "libzfs_impl.h" 43 44/* 45 * Structure to keep track of dataset state. Before changing the 'sharenfs' or 46 * 'mountpoint' property, we record whether the filesystem was previously 47 * mounted/shared. This prior state dictates whether we remount/reshare the 48 * dataset after the property has been changed. 49 * 50 * The interface consists of the following sequence of functions: 51 * 52 * changelist_gather() 53 * changelist_prefix() 54 * < change property > 55 * changelist_postfix() 56 * changelist_free() 57 * 58 * Other interfaces: 59 * 60 * changelist_remove() - remove a node from a gathered list 61 * changelist_rename() - renames all datasets appropriately when doing a rename 62 * changelist_unshare() - unshares all the nodes in a given changelist 63 * changelist_haszonedchild() - check if there is any child exported to 64 * a local zone 65 */ 66typedef struct prop_changenode { 67 zfs_handle_t *cn_handle; 68 int cn_shared; 69 int cn_mounted; 70 int cn_zoned; 71 boolean_t cn_needpost; /* is postfix() needed? */ 72 uu_avl_node_t cn_treenode; 73} prop_changenode_t; 74 75struct prop_changelist { 76 zfs_prop_t cl_prop; 77 zfs_prop_t cl_realprop; 78 zfs_prop_t cl_shareprop; /* used with sharenfs/sharesmb */ 79 uu_avl_pool_t *cl_pool; 80 uu_avl_t *cl_tree; 81 boolean_t cl_waslegacy; 82 boolean_t cl_allchildren; 83 boolean_t cl_alldependents; 84 int cl_mflags; /* Mount flags */ 85 int cl_gflags; /* Gather request flags */ 86 boolean_t cl_haszonedchild; 87}; 88 89/* 90 * If the property is 'mountpoint', go through and unmount filesystems as 91 * necessary. We don't do the same for 'sharenfs', because we can just re-share 92 * with different options without interrupting service. We do handle 'sharesmb' 93 * since there may be old resource names that need to be removed. 94 */ 95int 96changelist_prefix(prop_changelist_t *clp) 97{ 98 prop_changenode_t *cn; 99 uu_avl_walk_t *walk; 100 int ret = 0; 101 const enum sa_protocol smb[] = {SA_PROTOCOL_SMB, SA_NO_PROTOCOL}; 102 boolean_t commit_smb_shares = B_FALSE; 103 104 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT && 105 clp->cl_prop != ZFS_PROP_SHARESMB) 106 return (0); 107 108 /* 109 * If CL_GATHER_DONT_UNMOUNT is set, don't want to unmount/unshare and 110 * later (re)mount/(re)share the filesystem in postfix phase, so we 111 * return from here. If filesystem is mounted or unmounted, leave it 112 * as it is. 113 */ 114 if (clp->cl_gflags & CL_GATHER_DONT_UNMOUNT) 115 return (0); 116 117 if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL) 118 return (-1); 119 120 while ((cn = uu_avl_walk_next(walk)) != NULL) { 121 122 /* if a previous loop failed, set the remaining to false */ 123 if (ret == -1) { 124 cn->cn_needpost = B_FALSE; 125 continue; 126 } 127 128 /* 129 * If we are in the global zone, but this dataset is exported 130 * to a local zone, do nothing. 131 */ 132 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned) 133 continue; 134 135 if (!ZFS_IS_VOLUME(cn->cn_handle)) { 136 /* 137 * Do the property specific processing. 138 */ 139 switch (clp->cl_prop) { 140 case ZFS_PROP_MOUNTPOINT: 141 if (zfs_unmount(cn->cn_handle, NULL, 142 clp->cl_mflags) != 0) { 143 ret = -1; 144 cn->cn_needpost = B_FALSE; 145 } 146 break; 147 case ZFS_PROP_SHARESMB: 148 (void) zfs_unshare(cn->cn_handle, NULL, 149 smb); 150 commit_smb_shares = B_TRUE; 151 break; 152 153 default: 154 break; 155 } 156 } 157 } 158 159 if (commit_smb_shares) 160 zfs_commit_shares(smb); 161 uu_avl_walk_end(walk); 162 163 if (ret == -1) 164 (void) changelist_postfix(clp); 165 166 return (ret); 167} 168 169/* 170 * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or 171 * reshare the filesystems as necessary. In changelist_gather() we recorded 172 * whether the filesystem was previously shared or mounted. The action we take 173 * depends on the previous state, and whether the value was previously 'legacy'. 174 * For non-legacy properties, we always remount/reshare the filesystem, 175 * if CL_GATHER_DONT_UNMOUNT is not set. 176 */ 177int 178changelist_postfix(prop_changelist_t *clp) 179{ 180 prop_changenode_t *cn; 181 uu_avl_walk_t *walk; 182 char shareopts[ZFS_MAXPROPLEN]; 183 boolean_t commit_smb_shares = B_FALSE; 184 boolean_t commit_nfs_shares = B_FALSE; 185 186 /* 187 * If CL_GATHER_DONT_UNMOUNT is set, it means we don't want to (un)mount 188 * or (re/un)share the filesystem, so we return from here. If filesystem 189 * is mounted or unmounted, leave it as it is. 190 */ 191 if (clp->cl_gflags & CL_GATHER_DONT_UNMOUNT) 192 return (0); 193 194 /* 195 * If we're changing the mountpoint, attempt to destroy the underlying 196 * mountpoint. All other datasets will have inherited from this dataset 197 * (in which case their mountpoints exist in the filesystem in the new 198 * location), or have explicit mountpoints set (in which case they won't 199 * be in the changelist). 200 */ 201 if ((cn = uu_avl_last(clp->cl_tree)) == NULL) 202 return (0); 203 204 if (clp->cl_prop == ZFS_PROP_MOUNTPOINT && 205 !(clp->cl_gflags & CL_GATHER_DONT_UNMOUNT)) 206 remove_mountpoint(cn->cn_handle); 207 208 /* 209 * We walk the datasets in reverse, because we want to mount any parent 210 * datasets before mounting the children. We walk all datasets even if 211 * there are errors. 212 */ 213 if ((walk = uu_avl_walk_start(clp->cl_tree, 214 UU_WALK_REVERSE | UU_WALK_ROBUST)) == NULL) 215 return (-1); 216 217 while ((cn = uu_avl_walk_next(walk)) != NULL) { 218 219 boolean_t sharenfs; 220 boolean_t sharesmb; 221 boolean_t mounted; 222 boolean_t needs_key; 223 224 /* 225 * If we are in the global zone, but this dataset is exported 226 * to a local zone, do nothing. 227 */ 228 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned) 229 continue; 230 231 /* Only do post-processing if it's required */ 232 if (!cn->cn_needpost) 233 continue; 234 cn->cn_needpost = B_FALSE; 235 236 zfs_refresh_properties(cn->cn_handle); 237 238 if (ZFS_IS_VOLUME(cn->cn_handle)) 239 continue; 240 241 /* 242 * Remount if previously mounted or mountpoint was legacy, 243 * or sharenfs or sharesmb property is set. 244 */ 245 sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS, 246 shareopts, sizeof (shareopts), NULL, NULL, 0, 247 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0)); 248 249 sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB, 250 shareopts, sizeof (shareopts), NULL, NULL, 0, 251 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0)); 252 253 needs_key = (zfs_prop_get_int(cn->cn_handle, 254 ZFS_PROP_KEYSTATUS) == ZFS_KEYSTATUS_UNAVAILABLE); 255 256 mounted = zfs_is_mounted(cn->cn_handle, NULL); 257 258 if (!mounted && !needs_key && (cn->cn_mounted || 259 (((clp->cl_prop == ZFS_PROP_MOUNTPOINT && 260 clp->cl_prop == clp->cl_realprop) || 261 sharenfs || sharesmb || clp->cl_waslegacy) && 262 (zfs_prop_get_int(cn->cn_handle, 263 ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON)))) { 264 265 if (zfs_mount(cn->cn_handle, NULL, 0) == 0) 266 mounted = TRUE; 267 } 268 269 /* 270 * If the file system is mounted we always re-share even 271 * if the filesystem is currently shared, so that we can 272 * adopt any new options. 273 */ 274 const enum sa_protocol nfs[] = 275 {SA_PROTOCOL_NFS, SA_NO_PROTOCOL}; 276 if (sharenfs && mounted) { 277 zfs_share(cn->cn_handle, nfs); 278 commit_nfs_shares = B_TRUE; 279 } else if (cn->cn_shared || clp->cl_waslegacy) { 280 zfs_unshare(cn->cn_handle, NULL, nfs); 281 commit_nfs_shares = B_TRUE; 282 } 283 const enum sa_protocol smb[] = 284 {SA_PROTOCOL_SMB, SA_NO_PROTOCOL}; 285 if (sharesmb && mounted) { 286 zfs_share(cn->cn_handle, smb); 287 commit_smb_shares = B_TRUE; 288 } else if (cn->cn_shared || clp->cl_waslegacy) { 289 zfs_unshare(cn->cn_handle, NULL, smb); 290 commit_smb_shares = B_TRUE; 291 } 292 } 293 294 enum sa_protocol proto[SA_PROTOCOL_COUNT + 1], *p = proto; 295 if (commit_nfs_shares) 296 *p++ = SA_PROTOCOL_NFS; 297 if (commit_smb_shares) 298 *p++ = SA_PROTOCOL_SMB; 299 *p++ = SA_NO_PROTOCOL; 300 zfs_commit_shares(proto); 301 uu_avl_walk_end(walk); 302 303 return (0); 304} 305 306/* 307 * Is this "dataset" a child of "parent"? 308 */ 309static boolean_t 310isa_child_of(const char *dataset, const char *parent) 311{ 312 int len; 313 314 len = strlen(parent); 315 316 if (strncmp(dataset, parent, len) == 0 && 317 (dataset[len] == '@' || dataset[len] == '/' || 318 dataset[len] == '\0')) 319 return (B_TRUE); 320 else 321 return (B_FALSE); 322 323} 324 325/* 326 * If we rename a filesystem, child filesystem handles are no longer valid 327 * since we identify each dataset by its name in the ZFS namespace. As a 328 * result, we have to go through and fix up all the names appropriately. We 329 * could do this automatically if libzfs kept track of all open handles, but 330 * this is a lot less work. 331 */ 332void 333changelist_rename(prop_changelist_t *clp, const char *src, const char *dst) 334{ 335 prop_changenode_t *cn; 336 uu_avl_walk_t *walk; 337 char newname[ZFS_MAX_DATASET_NAME_LEN]; 338 339 if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL) 340 return; 341 342 while ((cn = uu_avl_walk_next(walk)) != NULL) { 343 /* 344 * Do not rename a clone that's not in the source hierarchy. 345 */ 346 if (!isa_child_of(cn->cn_handle->zfs_name, src)) 347 continue; 348 349 /* 350 * Destroy the previous mountpoint if needed. 351 */ 352 remove_mountpoint(cn->cn_handle); 353 354 (void) strlcpy(newname, dst, sizeof (newname)); 355 (void) strlcat(newname, cn->cn_handle->zfs_name + strlen(src), 356 sizeof (newname)); 357 358 (void) strlcpy(cn->cn_handle->zfs_name, newname, 359 sizeof (cn->cn_handle->zfs_name)); 360 } 361 362 uu_avl_walk_end(walk); 363} 364 365/* 366 * Given a gathered changelist for the 'sharenfs' or 'sharesmb' property, 367 * unshare all the datasets in the list. 368 */ 369int 370changelist_unshare(prop_changelist_t *clp, const enum sa_protocol *proto) 371{ 372 prop_changenode_t *cn; 373 uu_avl_walk_t *walk; 374 int ret = 0; 375 376 if (clp->cl_prop != ZFS_PROP_SHARENFS && 377 clp->cl_prop != ZFS_PROP_SHARESMB) 378 return (0); 379 380 if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL) 381 return (-1); 382 383 while ((cn = uu_avl_walk_next(walk)) != NULL) { 384 if (zfs_unshare(cn->cn_handle, NULL, proto) != 0) 385 ret = -1; 386 } 387 388 for (const enum sa_protocol *p = proto; *p != SA_NO_PROTOCOL; ++p) 389 sa_commit_shares(*p); 390 uu_avl_walk_end(walk); 391 392 return (ret); 393} 394 395/* 396 * Check if there is any child exported to a local zone in a given changelist. 397 * This information has already been recorded while gathering the changelist 398 * via changelist_gather(). 399 */ 400int 401changelist_haszonedchild(prop_changelist_t *clp) 402{ 403 return (clp->cl_haszonedchild); 404} 405 406/* 407 * Remove a node from a gathered list. 408 */ 409void 410changelist_remove(prop_changelist_t *clp, const char *name) 411{ 412 prop_changenode_t *cn; 413 uu_avl_walk_t *walk; 414 415 if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL) 416 return; 417 418 while ((cn = uu_avl_walk_next(walk)) != NULL) { 419 if (strcmp(cn->cn_handle->zfs_name, name) == 0) { 420 uu_avl_remove(clp->cl_tree, cn); 421 zfs_close(cn->cn_handle); 422 free(cn); 423 uu_avl_walk_end(walk); 424 return; 425 } 426 } 427 428 uu_avl_walk_end(walk); 429} 430 431/* 432 * Release any memory associated with a changelist. 433 */ 434void 435changelist_free(prop_changelist_t *clp) 436{ 437 prop_changenode_t *cn; 438 439 if (clp->cl_tree) { 440 uu_avl_walk_t *walk; 441 442 if ((walk = uu_avl_walk_start(clp->cl_tree, 443 UU_WALK_ROBUST)) == NULL) 444 return; 445 446 while ((cn = uu_avl_walk_next(walk)) != NULL) { 447 uu_avl_remove(clp->cl_tree, cn); 448 zfs_close(cn->cn_handle); 449 free(cn); 450 } 451 452 uu_avl_walk_end(walk); 453 uu_avl_destroy(clp->cl_tree); 454 } 455 if (clp->cl_pool) 456 uu_avl_pool_destroy(clp->cl_pool); 457 458 free(clp); 459} 460 461/* 462 * Add one dataset to changelist 463 */ 464static int 465changelist_add_mounted(zfs_handle_t *zhp, void *data) 466{ 467 prop_changelist_t *clp = data; 468 prop_changenode_t *cn; 469 uu_avl_index_t idx; 470 471 ASSERT3U(clp->cl_prop, ==, ZFS_PROP_MOUNTPOINT); 472 473 cn = zfs_alloc(zfs_get_handle(zhp), sizeof (prop_changenode_t)); 474 cn->cn_handle = zhp; 475 cn->cn_mounted = zfs_is_mounted(zhp, NULL); 476 ASSERT3U(cn->cn_mounted, ==, B_TRUE); 477 cn->cn_shared = zfs_is_shared(zhp, NULL, NULL); 478 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED); 479 cn->cn_needpost = B_TRUE; 480 481 /* Indicate if any child is exported to a local zone. */ 482 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned) 483 clp->cl_haszonedchild = B_TRUE; 484 485 uu_avl_node_init(cn, &cn->cn_treenode, clp->cl_pool); 486 487 if (uu_avl_find(clp->cl_tree, cn, NULL, &idx) == NULL) { 488 uu_avl_insert(clp->cl_tree, cn, idx); 489 } else { 490 free(cn); 491 zfs_close(zhp); 492 } 493 494 return (0); 495} 496 497static int 498change_one(zfs_handle_t *zhp, void *data) 499{ 500 prop_changelist_t *clp = data; 501 char property[ZFS_MAXPROPLEN]; 502 char where[64]; 503 prop_changenode_t *cn = NULL; 504 zprop_source_t sourcetype = ZPROP_SRC_NONE; 505 zprop_source_t share_sourcetype = ZPROP_SRC_NONE; 506 int ret = 0; 507 508 /* 509 * We only want to unmount/unshare those filesystems that may inherit 510 * from the target filesystem. If we find any filesystem with a 511 * locally set mountpoint, we ignore any children since changing the 512 * property will not affect them. If this is a rename, we iterate 513 * over all children regardless, since we need them unmounted in 514 * order to do the rename. Also, if this is a volume and we're doing 515 * a rename, then always add it to the changelist. 516 */ 517 518 if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) && 519 zfs_prop_get(zhp, clp->cl_prop, property, 520 sizeof (property), &sourcetype, where, sizeof (where), 521 B_FALSE) != 0) { 522 goto out; 523 } 524 525 /* 526 * If we are "watching" sharenfs or sharesmb 527 * then check out the companion property which is tracked 528 * in cl_shareprop 529 */ 530 if (clp->cl_shareprop != ZPROP_INVAL && 531 zfs_prop_get(zhp, clp->cl_shareprop, property, 532 sizeof (property), &share_sourcetype, where, sizeof (where), 533 B_FALSE) != 0) { 534 goto out; 535 } 536 537 if (clp->cl_alldependents || clp->cl_allchildren || 538 sourcetype == ZPROP_SRC_DEFAULT || 539 sourcetype == ZPROP_SRC_INHERITED || 540 (clp->cl_shareprop != ZPROP_INVAL && 541 (share_sourcetype == ZPROP_SRC_DEFAULT || 542 share_sourcetype == ZPROP_SRC_INHERITED))) { 543 cn = zfs_alloc(zfs_get_handle(zhp), sizeof (prop_changenode_t)); 544 cn->cn_handle = zhp; 545 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) || 546 zfs_is_mounted(zhp, NULL); 547 cn->cn_shared = zfs_is_shared(zhp, NULL, NULL); 548 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED); 549 cn->cn_needpost = B_TRUE; 550 551 /* Indicate if any child is exported to a local zone. */ 552 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned) 553 clp->cl_haszonedchild = B_TRUE; 554 555 uu_avl_node_init(cn, &cn->cn_treenode, clp->cl_pool); 556 557 uu_avl_index_t idx; 558 559 if (uu_avl_find(clp->cl_tree, cn, NULL, &idx) == NULL) { 560 uu_avl_insert(clp->cl_tree, cn, idx); 561 } else { 562 free(cn); 563 cn = NULL; 564 } 565 566 if (!clp->cl_alldependents) 567 ret = zfs_iter_children_v2(zhp, 0, change_one, data); 568 569 /* 570 * If we added the handle to the changelist, we will re-use it 571 * later so return without closing it. 572 */ 573 if (cn != NULL) 574 return (ret); 575 } 576 577out: 578 zfs_close(zhp); 579 return (ret); 580} 581 582static int 583compare_props(const void *a, const void *b, zfs_prop_t prop) 584{ 585 const prop_changenode_t *ca = a; 586 const prop_changenode_t *cb = b; 587 588 char propa[MAXPATHLEN]; 589 char propb[MAXPATHLEN]; 590 591 boolean_t haspropa, haspropb; 592 593 haspropa = (zfs_prop_get(ca->cn_handle, prop, propa, sizeof (propa), 594 NULL, NULL, 0, B_FALSE) == 0); 595 haspropb = (zfs_prop_get(cb->cn_handle, prop, propb, sizeof (propb), 596 NULL, NULL, 0, B_FALSE) == 0); 597 598 if (!haspropa && haspropb) 599 return (-1); 600 else if (haspropa && !haspropb) 601 return (1); 602 else if (!haspropa && !haspropb) 603 return (0); 604 else 605 return (strcmp(propb, propa)); 606} 607 608static int 609compare_mountpoints(const void *a, const void *b, void *unused) 610{ 611 /* 612 * When unsharing or unmounting filesystems, we need to do it in 613 * mountpoint order. This allows the user to have a mountpoint 614 * hierarchy that is different from the dataset hierarchy, and still 615 * allow it to be changed. 616 */ 617 (void) unused; 618 return (compare_props(a, b, ZFS_PROP_MOUNTPOINT)); 619} 620 621static int 622compare_dataset_names(const void *a, const void *b, void *unused) 623{ 624 (void) unused; 625 return (compare_props(a, b, ZFS_PROP_NAME)); 626} 627 628/* 629 * Given a ZFS handle and a property, construct a complete list of datasets 630 * that need to be modified as part of this process. For anything but the 631 * 'mountpoint' and 'sharenfs' properties, this just returns an empty list. 632 * Otherwise, we iterate over all children and look for any datasets that 633 * inherit the property. For each such dataset, we add it to the list and 634 * mark whether it was shared beforehand. 635 */ 636prop_changelist_t * 637changelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int gather_flags, 638 int mnt_flags) 639{ 640 prop_changelist_t *clp; 641 prop_changenode_t *cn; 642 zfs_handle_t *temp; 643 char property[ZFS_MAXPROPLEN]; 644 boolean_t legacy = B_FALSE; 645 646 clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t)); 647 648 /* 649 * For mountpoint-related tasks, we want to sort everything by 650 * mountpoint, so that we mount and unmount them in the appropriate 651 * order, regardless of their position in the hierarchy. 652 */ 653 if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED || 654 prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS || 655 prop == ZFS_PROP_SHARESMB) { 656 657 if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, 658 property, sizeof (property), 659 NULL, NULL, 0, B_FALSE) == 0 && 660 (strcmp(property, "legacy") == 0 || 661 strcmp(property, "none") == 0)) { 662 legacy = B_TRUE; 663 } 664 } 665 666 clp->cl_pool = uu_avl_pool_create("changelist_pool", 667 sizeof (prop_changenode_t), 668 offsetof(prop_changenode_t, cn_treenode), 669 legacy ? compare_dataset_names : compare_mountpoints, 0); 670 if (clp->cl_pool == NULL) { 671 assert(uu_error() == UU_ERROR_NO_MEMORY); 672 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error"); 673 changelist_free(clp); 674 return (NULL); 675 } 676 677 clp->cl_tree = uu_avl_create(clp->cl_pool, NULL, UU_DEFAULT); 678 clp->cl_gflags = gather_flags; 679 clp->cl_mflags = mnt_flags; 680 681 if (clp->cl_tree == NULL) { 682 assert(uu_error() == UU_ERROR_NO_MEMORY); 683 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error"); 684 changelist_free(clp); 685 return (NULL); 686 } 687 688 /* 689 * If this is a rename or the 'zoned' property, we pretend we're 690 * changing the mountpoint and flag it so we can catch all children in 691 * change_one(). 692 * 693 * Flag cl_alldependents to catch all children plus the dependents 694 * (clones) that are not in the hierarchy. 695 */ 696 if (prop == ZFS_PROP_NAME) { 697 clp->cl_prop = ZFS_PROP_MOUNTPOINT; 698 clp->cl_alldependents = B_TRUE; 699 } else if (prop == ZFS_PROP_ZONED) { 700 clp->cl_prop = ZFS_PROP_MOUNTPOINT; 701 clp->cl_allchildren = B_TRUE; 702 } else if (prop == ZFS_PROP_CANMOUNT) { 703 clp->cl_prop = ZFS_PROP_MOUNTPOINT; 704 } else if (prop == ZFS_PROP_VOLSIZE) { 705 clp->cl_prop = ZFS_PROP_MOUNTPOINT; 706 } else { 707 clp->cl_prop = prop; 708 } 709 clp->cl_realprop = prop; 710 711 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT && 712 clp->cl_prop != ZFS_PROP_SHARENFS && 713 clp->cl_prop != ZFS_PROP_SHARESMB) 714 return (clp); 715 716 /* 717 * If watching SHARENFS or SHARESMB then 718 * also watch its companion property. 719 */ 720 if (clp->cl_prop == ZFS_PROP_SHARENFS) 721 clp->cl_shareprop = ZFS_PROP_SHARESMB; 722 else if (clp->cl_prop == ZFS_PROP_SHARESMB) 723 clp->cl_shareprop = ZFS_PROP_SHARENFS; 724 725 if (clp->cl_prop == ZFS_PROP_MOUNTPOINT && 726 (clp->cl_gflags & CL_GATHER_ITER_MOUNTED)) { 727 /* 728 * Instead of iterating through all of the dataset children we 729 * gather mounted dataset children from MNTTAB 730 */ 731 if (zfs_iter_mounted(zhp, changelist_add_mounted, clp) != 0) { 732 changelist_free(clp); 733 return (NULL); 734 } 735 } else if (clp->cl_alldependents) { 736 if (zfs_iter_dependents_v2(zhp, 0, B_TRUE, change_one, 737 clp) != 0) { 738 changelist_free(clp); 739 return (NULL); 740 } 741 } else if (zfs_iter_children_v2(zhp, 0, change_one, clp) != 0) { 742 changelist_free(clp); 743 return (NULL); 744 } 745 746 /* 747 * We have to re-open ourselves because we auto-close all the handles 748 * and can't tell the difference. 749 */ 750 if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp), 751 ZFS_TYPE_DATASET)) == NULL) { 752 changelist_free(clp); 753 return (NULL); 754 } 755 756 /* 757 * Always add ourself to the list. We add ourselves to the end so that 758 * we're the last to be unmounted. 759 */ 760 cn = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changenode_t)); 761 cn->cn_handle = temp; 762 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) || 763 zfs_is_mounted(temp, NULL); 764 cn->cn_shared = zfs_is_shared(temp, NULL, NULL); 765 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED); 766 cn->cn_needpost = B_TRUE; 767 768 uu_avl_node_init(cn, &cn->cn_treenode, clp->cl_pool); 769 uu_avl_index_t idx; 770 if (uu_avl_find(clp->cl_tree, cn, NULL, &idx) == NULL) { 771 uu_avl_insert(clp->cl_tree, cn, idx); 772 } else { 773 free(cn); 774 zfs_close(temp); 775 } 776 777 /* 778 * If the mountpoint property was previously 'legacy', or 'none', 779 * record it as the behavior of changelist_postfix() will be different. 780 */ 781 if ((clp->cl_prop == ZFS_PROP_MOUNTPOINT) && legacy) { 782 /* 783 * do not automatically mount ex-legacy datasets if 784 * we specifically set canmount to noauto 785 */ 786 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) != 787 ZFS_CANMOUNT_NOAUTO) 788 clp->cl_waslegacy = B_TRUE; 789 } 790 791 return (clp); 792} 793