1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or https://opensource.org/licenses/CDDL-1.0.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 /*
24 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
25 * Use is subject to license terms.
26 *
27 * Portions Copyright 2007 Ramprakash Jelari
28 * Copyright (c) 2014, 2020 by Delphix. All rights reserved.
29 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
30 * Copyright (c) 2018 Datto Inc.
31 */
32
33 #include <libintl.h>
34 #include <stddef.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38 #include <zone.h>
39 #include <sys/avl.h>
40
41 #include <libzfs.h>
42
43 #include "libzfs_impl.h"
44
45 /*
46 * Structure to keep track of dataset state. Before changing the 'sharenfs' or
47 * 'mountpoint' property, we record whether the filesystem was previously
48 * mounted/shared. This prior state dictates whether we remount/reshare the
49 * dataset after the property has been changed.
50 *
51 * The interface consists of the following sequence of functions:
52 *
53 * changelist_gather()
54 * changelist_prefix()
55 * < change property >
56 * changelist_postfix()
57 * changelist_free()
58 *
59 * Other interfaces:
60 *
61 * changelist_remove() - remove a node from a gathered list
62 * changelist_rename() - renames all datasets appropriately when doing a rename
63 * changelist_unshare() - unshares all the nodes in a given changelist
64 * changelist_haszonedchild() - check if there is any child exported to
65 * a local zone
66 */
67 typedef struct prop_changenode {
68 zfs_handle_t *cn_handle;
69 int cn_shared;
70 int cn_mounted;
71 int cn_zoned;
72 boolean_t cn_needpost; /* is postfix() needed? */
73 avl_node_t cn_treenode;
74 } prop_changenode_t;
75
76 struct prop_changelist {
77 zfs_prop_t cl_prop;
78 zfs_prop_t cl_realprop;
79 zfs_prop_t cl_shareprop; /* used with sharenfs/sharesmb */
80 avl_tree_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 */
95 int
changelist_prefix(prop_changelist_t * clp)96 changelist_prefix(prop_changelist_t *clp)
97 {
98 prop_changenode_t *cn;
99 int ret = 0;
100 const enum sa_protocol smb[] = {SA_PROTOCOL_SMB, SA_NO_PROTOCOL};
101 boolean_t commit_smb_shares = B_FALSE;
102
103 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
104 clp->cl_prop != ZFS_PROP_SHARESMB)
105 return (0);
106
107 /*
108 * If CL_GATHER_DONT_UNMOUNT is set, don't want to unmount/unshare and
109 * later (re)mount/(re)share the filesystem in postfix phase, so we
110 * return from here. If filesystem is mounted or unmounted, leave it
111 * as it is.
112 */
113 if (clp->cl_gflags & CL_GATHER_DONT_UNMOUNT)
114 return (0);
115
116 for (cn = avl_first(&clp->cl_tree); cn != NULL;
117 cn = AVL_NEXT(&clp->cl_tree, cn)) {
118
119 /* if a previous loop failed, set the remaining to false */
120 if (ret == -1) {
121 cn->cn_needpost = B_FALSE;
122 continue;
123 }
124
125 /*
126 * If we are in the global zone, but this dataset is exported
127 * to a local zone, do nothing.
128 */
129 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
130 continue;
131
132 if (!ZFS_IS_VOLUME(cn->cn_handle)) {
133 /*
134 * Do the property specific processing.
135 */
136 switch (clp->cl_prop) {
137 case ZFS_PROP_MOUNTPOINT:
138 if (zfs_unmount(cn->cn_handle, NULL,
139 clp->cl_mflags) != 0) {
140 ret = -1;
141 cn->cn_needpost = B_FALSE;
142 }
143 break;
144 case ZFS_PROP_SHARESMB:
145 (void) zfs_unshare(cn->cn_handle, NULL,
146 smb);
147 commit_smb_shares = B_TRUE;
148 break;
149
150 default:
151 break;
152 }
153 }
154 }
155
156 if (commit_smb_shares)
157 zfs_commit_shares(smb);
158
159 if (ret == -1)
160 (void) changelist_postfix(clp);
161
162 return (ret);
163 }
164
165 /*
166 * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or
167 * reshare the filesystems as necessary. In changelist_gather() we recorded
168 * whether the filesystem was previously shared or mounted. The action we take
169 * depends on the previous state, and whether the value was previously 'legacy'.
170 * For non-legacy properties, we always remount/reshare the filesystem,
171 * if CL_GATHER_DONT_UNMOUNT is not set.
172 */
173 int
changelist_postfix(prop_changelist_t * clp)174 changelist_postfix(prop_changelist_t *clp)
175 {
176 prop_changenode_t *cn;
177 char shareopts[ZFS_MAXPROPLEN];
178 boolean_t commit_smb_shares = B_FALSE;
179 boolean_t commit_nfs_shares = B_FALSE;
180
181 /*
182 * If CL_GATHER_DONT_UNMOUNT is set, it means we don't want to (un)mount
183 * or (re/un)share the filesystem, so we return from here. If filesystem
184 * is mounted or unmounted, leave it as it is.
185 */
186 if (clp->cl_gflags & CL_GATHER_DONT_UNMOUNT)
187 return (0);
188
189 /*
190 * If we're changing the mountpoint, attempt to destroy the underlying
191 * mountpoint. All other datasets will have inherited from this dataset
192 * (in which case their mountpoints exist in the filesystem in the new
193 * location), or have explicit mountpoints set (in which case they won't
194 * be in the changelist).
195 */
196 if ((cn = avl_last(&clp->cl_tree)) == NULL)
197 return (0);
198
199 if (clp->cl_prop == ZFS_PROP_MOUNTPOINT &&
200 !(clp->cl_gflags & CL_GATHER_DONT_UNMOUNT))
201 remove_mountpoint(cn->cn_handle);
202
203 /*
204 * We walk the datasets in reverse, because we want to mount any parent
205 * datasets before mounting the children. We walk all datasets even if
206 * there are errors.
207 */
208 for (cn = avl_last(&clp->cl_tree); cn != NULL;
209 cn = AVL_PREV(&clp->cl_tree, cn)) {
210
211 boolean_t sharenfs;
212 boolean_t sharesmb;
213 boolean_t mounted;
214 boolean_t needs_key;
215
216 /*
217 * If we are in the global zone, but this dataset is exported
218 * to a local zone, do nothing.
219 */
220 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
221 continue;
222
223 /* Only do post-processing if it's required */
224 if (!cn->cn_needpost)
225 continue;
226 cn->cn_needpost = B_FALSE;
227
228 zfs_refresh_properties(cn->cn_handle);
229
230 if (ZFS_IS_VOLUME(cn->cn_handle))
231 continue;
232
233 /*
234 * Remount if previously mounted or mountpoint was legacy,
235 * or sharenfs or sharesmb property is set.
236 */
237 sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS,
238 shareopts, sizeof (shareopts), NULL, NULL, 0,
239 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
240
241 sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB,
242 shareopts, sizeof (shareopts), NULL, NULL, 0,
243 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
244
245 needs_key = (zfs_prop_get_int(cn->cn_handle,
246 ZFS_PROP_KEYSTATUS) == ZFS_KEYSTATUS_UNAVAILABLE);
247
248 mounted = zfs_is_mounted(cn->cn_handle, NULL);
249
250 if (!mounted && !needs_key && (cn->cn_mounted ||
251 (((clp->cl_prop == ZFS_PROP_MOUNTPOINT &&
252 clp->cl_prop == clp->cl_realprop) ||
253 sharenfs || sharesmb || clp->cl_waslegacy) &&
254 (zfs_prop_get_int(cn->cn_handle,
255 ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON)))) {
256
257 if (zfs_mount(cn->cn_handle, NULL, 0) == 0)
258 mounted = TRUE;
259 }
260
261 /*
262 * If the file system is mounted we always re-share even
263 * if the filesystem is currently shared, so that we can
264 * adopt any new options.
265 */
266 const enum sa_protocol nfs[] =
267 {SA_PROTOCOL_NFS, SA_NO_PROTOCOL};
268 if (sharenfs && mounted) {
269 zfs_share(cn->cn_handle, nfs);
270 commit_nfs_shares = B_TRUE;
271 } else if (cn->cn_shared || clp->cl_waslegacy) {
272 zfs_unshare(cn->cn_handle, NULL, nfs);
273 commit_nfs_shares = B_TRUE;
274 }
275 const enum sa_protocol smb[] =
276 {SA_PROTOCOL_SMB, SA_NO_PROTOCOL};
277 if (sharesmb && mounted) {
278 zfs_share(cn->cn_handle, smb);
279 commit_smb_shares = B_TRUE;
280 } else if (cn->cn_shared || clp->cl_waslegacy) {
281 zfs_unshare(cn->cn_handle, NULL, smb);
282 commit_smb_shares = B_TRUE;
283 }
284 }
285
286 enum sa_protocol proto[SA_PROTOCOL_COUNT + 1], *p = proto;
287 if (commit_nfs_shares)
288 *p++ = SA_PROTOCOL_NFS;
289 if (commit_smb_shares)
290 *p++ = SA_PROTOCOL_SMB;
291 *p++ = SA_NO_PROTOCOL;
292 zfs_commit_shares(proto);
293
294 return (0);
295 }
296
297 /*
298 * Is this "dataset" a child of "parent"?
299 */
300 static boolean_t
isa_child_of(const char * dataset,const char * parent)301 isa_child_of(const char *dataset, const char *parent)
302 {
303 int len;
304
305 len = strlen(parent);
306
307 if (strncmp(dataset, parent, len) == 0 &&
308 (dataset[len] == '@' || dataset[len] == '/' ||
309 dataset[len] == '\0'))
310 return (B_TRUE);
311 else
312 return (B_FALSE);
313
314 }
315
316 /*
317 * If we rename a filesystem, child filesystem handles are no longer valid
318 * since we identify each dataset by its name in the ZFS namespace. As a
319 * result, we have to go through and fix up all the names appropriately. We
320 * could do this automatically if libzfs kept track of all open handles, but
321 * this is a lot less work.
322 */
323 void
changelist_rename(prop_changelist_t * clp,const char * src,const char * dst)324 changelist_rename(prop_changelist_t *clp, const char *src, const char *dst)
325 {
326 prop_changenode_t *cn;
327 char newname[ZFS_MAX_DATASET_NAME_LEN];
328
329 for (cn = avl_first(&clp->cl_tree); cn != NULL;
330 cn = AVL_NEXT(&clp->cl_tree, cn)) {
331 /*
332 * Do not rename a clone that's not in the source hierarchy.
333 */
334 if (!isa_child_of(cn->cn_handle->zfs_name, src))
335 continue;
336
337 /*
338 * Destroy the previous mountpoint if needed.
339 */
340 remove_mountpoint(cn->cn_handle);
341
342 (void) strlcpy(newname, dst, sizeof (newname));
343 (void) strlcat(newname, cn->cn_handle->zfs_name + strlen(src),
344 sizeof (newname));
345
346 (void) strlcpy(cn->cn_handle->zfs_name, newname,
347 sizeof (cn->cn_handle->zfs_name));
348 }
349 }
350
351 /*
352 * Given a gathered changelist for the 'sharenfs' or 'sharesmb' property,
353 * unshare all the datasets in the list.
354 */
355 int
changelist_unshare(prop_changelist_t * clp,const enum sa_protocol * proto)356 changelist_unshare(prop_changelist_t *clp, const enum sa_protocol *proto)
357 {
358 prop_changenode_t *cn;
359 int ret = 0;
360
361 if (clp->cl_prop != ZFS_PROP_SHARENFS &&
362 clp->cl_prop != ZFS_PROP_SHARESMB)
363 return (0);
364
365 for (cn = avl_first(&clp->cl_tree); cn != NULL;
366 cn = AVL_NEXT(&clp->cl_tree, cn)) {
367 if (zfs_unshare(cn->cn_handle, NULL, proto) != 0)
368 ret = -1;
369 }
370
371 for (const enum sa_protocol *p = proto; *p != SA_NO_PROTOCOL; ++p)
372 sa_commit_shares(*p);
373
374 return (ret);
375 }
376
377 /*
378 * Check if there is any child exported to a local zone in a given changelist.
379 * This information has already been recorded while gathering the changelist
380 * via changelist_gather().
381 */
382 int
changelist_haszonedchild(prop_changelist_t * clp)383 changelist_haszonedchild(prop_changelist_t *clp)
384 {
385 return (clp->cl_haszonedchild);
386 }
387
388 /*
389 * Remove a node from a gathered list.
390 */
391 void
changelist_remove(prop_changelist_t * clp,const char * name)392 changelist_remove(prop_changelist_t *clp, const char *name)
393 {
394 prop_changenode_t *cn;
395
396 for (cn = avl_first(&clp->cl_tree); cn != NULL;
397 cn = AVL_NEXT(&clp->cl_tree, cn)) {
398 if (strcmp(cn->cn_handle->zfs_name, name) == 0) {
399 avl_remove(&clp->cl_tree, cn);
400 zfs_close(cn->cn_handle);
401 free(cn);
402 return;
403 }
404 }
405 }
406
407 /*
408 * Release any memory associated with a changelist.
409 */
410 void
changelist_free(prop_changelist_t * clp)411 changelist_free(prop_changelist_t *clp)
412 {
413 prop_changenode_t *cn;
414 void *cookie = NULL;
415
416 while ((cn = avl_destroy_nodes(&clp->cl_tree, &cookie)) != NULL) {
417 zfs_close(cn->cn_handle);
418 free(cn);
419 }
420
421 avl_destroy(&clp->cl_tree);
422 free(clp);
423 }
424
425 /*
426 * Add one dataset to changelist
427 */
428 static int
changelist_add_mounted(zfs_handle_t * zhp,void * data)429 changelist_add_mounted(zfs_handle_t *zhp, void *data)
430 {
431 prop_changelist_t *clp = data;
432 prop_changenode_t *cn;
433 avl_index_t idx;
434
435 ASSERT3U(clp->cl_prop, ==, ZFS_PROP_MOUNTPOINT);
436
437 cn = zfs_alloc(zfs_get_handle(zhp), sizeof (prop_changenode_t));
438 cn->cn_handle = zhp;
439 cn->cn_mounted = zfs_is_mounted(zhp, NULL);
440 ASSERT3U(cn->cn_mounted, ==, B_TRUE);
441 cn->cn_shared = zfs_is_shared(zhp, NULL, NULL);
442 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
443 cn->cn_needpost = B_TRUE;
444
445 /* Indicate if any child is exported to a local zone. */
446 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
447 clp->cl_haszonedchild = B_TRUE;
448
449 if (avl_find(&clp->cl_tree, cn, &idx) == NULL) {
450 avl_insert(&clp->cl_tree, cn, idx);
451 } else {
452 free(cn);
453 zfs_close(zhp);
454 }
455
456 return (0);
457 }
458
459 static int
change_one(zfs_handle_t * zhp,void * data)460 change_one(zfs_handle_t *zhp, void *data)
461 {
462 prop_changelist_t *clp = data;
463 char property[ZFS_MAXPROPLEN];
464 char where[64];
465 prop_changenode_t *cn = NULL;
466 zprop_source_t sourcetype = ZPROP_SRC_NONE;
467 zprop_source_t share_sourcetype = ZPROP_SRC_NONE;
468 int ret = 0;
469
470 /*
471 * We only want to unmount/unshare those filesystems that may inherit
472 * from the target filesystem. If we find any filesystem with a
473 * locally set mountpoint, we ignore any children since changing the
474 * property will not affect them. If this is a rename, we iterate
475 * over all children regardless, since we need them unmounted in
476 * order to do the rename. Also, if this is a volume and we're doing
477 * a rename, then always add it to the changelist.
478 */
479
480 if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) &&
481 zfs_prop_get(zhp, clp->cl_prop, property,
482 sizeof (property), &sourcetype, where, sizeof (where),
483 B_FALSE) != 0) {
484 goto out;
485 }
486
487 /*
488 * If we are "watching" sharenfs or sharesmb
489 * then check out the companion property which is tracked
490 * in cl_shareprop
491 */
492 if (clp->cl_shareprop != ZPROP_INVAL &&
493 zfs_prop_get(zhp, clp->cl_shareprop, property,
494 sizeof (property), &share_sourcetype, where, sizeof (where),
495 B_FALSE) != 0) {
496 goto out;
497 }
498
499 if (clp->cl_alldependents || clp->cl_allchildren ||
500 sourcetype == ZPROP_SRC_DEFAULT ||
501 sourcetype == ZPROP_SRC_INHERITED ||
502 (clp->cl_shareprop != ZPROP_INVAL &&
503 (share_sourcetype == ZPROP_SRC_DEFAULT ||
504 share_sourcetype == ZPROP_SRC_INHERITED))) {
505 cn = zfs_alloc(zfs_get_handle(zhp), sizeof (prop_changenode_t));
506 cn->cn_handle = zhp;
507 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
508 zfs_is_mounted(zhp, NULL);
509 cn->cn_shared = zfs_is_shared(zhp, NULL, NULL);
510 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
511 cn->cn_needpost = B_TRUE;
512
513 /* Indicate if any child is exported to a local zone. */
514 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
515 clp->cl_haszonedchild = B_TRUE;
516
517 avl_index_t idx;
518 if (avl_find(&clp->cl_tree, cn, &idx) == NULL) {
519 avl_insert(&clp->cl_tree, cn, idx);
520 } else {
521 free(cn);
522 cn = NULL;
523 }
524
525 if (!clp->cl_alldependents) {
526 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT) {
527 ret = zfs_iter_filesystems_v2(zhp, 0,
528 change_one, data);
529 } else {
530 ret = zfs_iter_children_v2(zhp, 0, change_one,
531 data);
532 }
533 }
534
535 /*
536 * If we added the handle to the changelist, we will re-use it
537 * later so return without closing it.
538 */
539 if (cn != NULL)
540 return (ret);
541 }
542
543 out:
544 zfs_close(zhp);
545 return (ret);
546 }
547
548 static int
compare_props(const void * a,const void * b,zfs_prop_t prop)549 compare_props(const void *a, const void *b, zfs_prop_t prop)
550 {
551 const prop_changenode_t *ca = a;
552 const prop_changenode_t *cb = b;
553
554 char propa[MAXPATHLEN];
555 char propb[MAXPATHLEN];
556
557 boolean_t haspropa, haspropb;
558
559 haspropa = (zfs_prop_get(ca->cn_handle, prop, propa, sizeof (propa),
560 NULL, NULL, 0, B_FALSE) == 0);
561 haspropb = (zfs_prop_get(cb->cn_handle, prop, propb, sizeof (propb),
562 NULL, NULL, 0, B_FALSE) == 0);
563
564 if (!haspropa && haspropb)
565 return (-1);
566 else if (haspropa && !haspropb)
567 return (1);
568 else if (!haspropa && !haspropb)
569 return (0);
570 else
571 return (TREE_ISIGN(strcmp(propb, propa)));
572 }
573
574 static int
compare_mountpoints(const void * a,const void * b)575 compare_mountpoints(const void *a, const void *b)
576 {
577 /*
578 * When unsharing or unmounting filesystems, we need to do it in
579 * mountpoint order. This allows the user to have a mountpoint
580 * hierarchy that is different from the dataset hierarchy, and still
581 * allow it to be changed.
582 */
583 return (compare_props(a, b, ZFS_PROP_MOUNTPOINT));
584 }
585
586 static int
compare_dataset_names(const void * a,const void * b)587 compare_dataset_names(const void *a, const void *b)
588 {
589 return (compare_props(a, b, ZFS_PROP_NAME));
590 }
591
592 /*
593 * Given a ZFS handle and a property, construct a complete list of datasets
594 * that need to be modified as part of this process. For anything but the
595 * 'mountpoint' and 'sharenfs' properties, this just returns an empty list.
596 * Otherwise, we iterate over all children and look for any datasets that
597 * inherit the property. For each such dataset, we add it to the list and
598 * mark whether it was shared beforehand.
599 */
600 prop_changelist_t *
changelist_gather(zfs_handle_t * zhp,zfs_prop_t prop,int gather_flags,int mnt_flags)601 changelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int gather_flags,
602 int mnt_flags)
603 {
604 prop_changelist_t *clp;
605 prop_changenode_t *cn;
606 zfs_handle_t *temp;
607 char property[ZFS_MAXPROPLEN];
608 boolean_t legacy = B_FALSE;
609
610 clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t));
611
612 /*
613 * For mountpoint-related tasks, we want to sort everything by
614 * mountpoint, so that we mount and unmount them in the appropriate
615 * order, regardless of their position in the hierarchy.
616 */
617 if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED ||
618 prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS ||
619 prop == ZFS_PROP_SHARESMB) {
620
621 if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
622 property, sizeof (property),
623 NULL, NULL, 0, B_FALSE) == 0 &&
624 (strcmp(property, "legacy") == 0 ||
625 strcmp(property, "none") == 0)) {
626 legacy = B_TRUE;
627 }
628 }
629
630 avl_create(&clp->cl_tree,
631 legacy ? compare_dataset_names : compare_mountpoints,
632 sizeof (prop_changenode_t),
633 offsetof(prop_changenode_t, cn_treenode));
634
635 clp->cl_gflags = gather_flags;
636 clp->cl_mflags = mnt_flags;
637
638 /*
639 * If this is a rename or the 'zoned' property, we pretend we're
640 * changing the mountpoint and flag it so we can catch all children in
641 * change_one().
642 *
643 * Flag cl_alldependents to catch all children plus the dependents
644 * (clones) that are not in the hierarchy.
645 */
646 if (prop == ZFS_PROP_NAME) {
647 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
648 clp->cl_alldependents = B_TRUE;
649 } else if (prop == ZFS_PROP_ZONED) {
650 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
651 clp->cl_allchildren = B_TRUE;
652 } else if (prop == ZFS_PROP_CANMOUNT) {
653 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
654 } else if (prop == ZFS_PROP_VOLSIZE) {
655 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
656 } else {
657 clp->cl_prop = prop;
658 }
659 clp->cl_realprop = prop;
660
661 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
662 clp->cl_prop != ZFS_PROP_SHARENFS &&
663 clp->cl_prop != ZFS_PROP_SHARESMB)
664 return (clp);
665
666 /*
667 * If watching SHARENFS or SHARESMB then
668 * also watch its companion property.
669 */
670 if (clp->cl_prop == ZFS_PROP_SHARENFS)
671 clp->cl_shareprop = ZFS_PROP_SHARESMB;
672 else if (clp->cl_prop == ZFS_PROP_SHARESMB)
673 clp->cl_shareprop = ZFS_PROP_SHARENFS;
674
675 if (clp->cl_prop == ZFS_PROP_MOUNTPOINT &&
676 (clp->cl_gflags & CL_GATHER_ITER_MOUNTED)) {
677 /*
678 * Instead of iterating through all of the dataset children we
679 * gather mounted dataset children from MNTTAB
680 */
681 if (zfs_iter_mounted(zhp, changelist_add_mounted, clp) != 0) {
682 changelist_free(clp);
683 return (NULL);
684 }
685 } else if (clp->cl_alldependents) {
686 if (zfs_iter_dependents_v2(zhp, 0, B_TRUE, change_one,
687 clp) != 0) {
688 changelist_free(clp);
689 return (NULL);
690 }
691 } else if (clp->cl_prop != ZFS_PROP_MOUNTPOINT) {
692 if (zfs_iter_filesystems_v2(zhp, 0, change_one, clp) != 0) {
693 changelist_free(clp);
694 return (NULL);
695 }
696 } else if (zfs_iter_children_v2(zhp, 0, change_one, clp) != 0) {
697 changelist_free(clp);
698 return (NULL);
699 }
700
701 /*
702 * We have to re-open ourselves because we auto-close all the handles
703 * and can't tell the difference.
704 */
705 if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp),
706 ZFS_TYPE_DATASET)) == NULL) {
707 changelist_free(clp);
708 return (NULL);
709 }
710
711 /*
712 * Always add ourself to the list. We add ourselves to the end so that
713 * we're the last to be unmounted.
714 */
715 cn = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changenode_t));
716 cn->cn_handle = temp;
717 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
718 zfs_is_mounted(temp, NULL);
719 cn->cn_shared = zfs_is_shared(temp, NULL, NULL);
720 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
721 cn->cn_needpost = B_TRUE;
722
723 avl_index_t idx;
724 if (avl_find(&clp->cl_tree, cn, &idx) == NULL) {
725 avl_insert(&clp->cl_tree, cn, idx);
726 } else {
727 free(cn);
728 zfs_close(temp);
729 }
730
731 /*
732 * If the mountpoint property was previously 'legacy', or 'none',
733 * record it as the behavior of changelist_postfix() will be different.
734 */
735 if ((clp->cl_prop == ZFS_PROP_MOUNTPOINT) && legacy) {
736 /*
737 * do not automatically mount ex-legacy datasets if
738 * we specifically set canmount to noauto
739 */
740 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) !=
741 ZFS_CANMOUNT_NOAUTO)
742 clp->cl_waslegacy = B_TRUE;
743 }
744
745 return (clp);
746 }
747