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1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 *
26 * Portions Copyright 2007 Ramprakash Jelari
27 */
28
29 #include <libintl.h>
30 #include <libuutil.h>
31 #include <stddef.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <unistd.h>
35 #include <zone.h>
36
37 #include <libzfs.h>
38
39 #include "libzfs_impl.h"
40
41 /*
42 * Structure to keep track of dataset state. Before changing the 'sharenfs' or
43 * 'mountpoint' property, we record whether the filesystem was previously
44 * mounted/shared. This prior state dictates whether we remount/reshare the
45 * dataset after the property has been changed.
46 *
47 * The interface consists of the following sequence of functions:
48 *
49 * changelist_gather()
50 * changelist_prefix()
51 * < change property >
52 * changelist_postfix()
53 * changelist_free()
54 *
55 * Other interfaces:
56 *
57 * changelist_remove() - remove a node from a gathered list
58 * changelist_rename() - renames all datasets appropriately when doing a rename
59 * changelist_unshare() - unshares all the nodes in a given changelist
60 * changelist_haszonedchild() - check if there is any child exported to
61 * a local zone
62 */
63 typedef struct prop_changenode {
64 zfs_handle_t *cn_handle;
65 int cn_shared;
66 int cn_mounted;
67 int cn_zoned;
68 boolean_t cn_needpost; /* is postfix() needed? */
69 uu_list_node_t cn_listnode;
70 } prop_changenode_t;
71
72 struct prop_changelist {
73 zfs_prop_t cl_prop;
74 zfs_prop_t cl_realprop;
75 zfs_prop_t cl_shareprop; /* used with sharenfs/sharesmb */
76 uu_list_pool_t *cl_pool;
77 uu_list_t *cl_list;
78 boolean_t cl_waslegacy;
79 boolean_t cl_allchildren;
80 boolean_t cl_alldependents;
81 int cl_mflags; /* Mount flags */
82 int cl_gflags; /* Gather request flags */
83 boolean_t cl_haszonedchild;
84 boolean_t cl_sorted;
85 };
86
87 /*
88 * If the property is 'mountpoint', go through and unmount filesystems as
89 * necessary. We don't do the same for 'sharenfs', because we can just re-share
90 * with different options without interrupting service. We do handle 'sharesmb'
91 * since there may be old resource names that need to be removed.
92 */
93 int
94 changelist_prefix(prop_changelist_t *clp)
95 {
96 prop_changenode_t *cn;
97 int ret = 0;
98
99 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
100 clp->cl_prop != ZFS_PROP_SHARESMB)
101 return (0);
102
103 for (cn = uu_list_first(clp->cl_list); cn != NULL;
104 cn = uu_list_next(clp->cl_list, cn)) {
105
106 /* if a previous loop failed, set the remaining to false */
107 if (ret == -1) {
108 cn->cn_needpost = B_FALSE;
109 continue;
110 }
111
112 /*
113 * If we are in the global zone, but this dataset is exported
114 * to a local zone, do nothing.
115 */
116 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
117 continue;
118
119 if (ZFS_IS_VOLUME(cn->cn_handle)) {
120 switch (clp->cl_realprop) {
121 case ZFS_PROP_NAME:
122 /*
123 * If this was a rename, unshare the zvol, and
124 * remove the /dev/zvol links.
125 */
126 (void) zfs_unshare_iscsi(cn->cn_handle);
127
128 if (zvol_remove_link(cn->cn_handle->zfs_hdl,
129 cn->cn_handle->zfs_name) != 0) {
130 ret = -1;
131 cn->cn_needpost = B_FALSE;
132 (void) zfs_share_iscsi(cn->cn_handle);
133 }
134 break;
135
136 case ZFS_PROP_VOLSIZE:
137 /*
138 * If this was a change to the volume size, we
139 * need to unshare and reshare the volume.
140 */
141 (void) zfs_unshare_iscsi(cn->cn_handle);
142 break;
143 }
144 } else {
145 /*
146 * Do the property specific processing.
147 */
148 switch (clp->cl_prop) {
149 case ZFS_PROP_MOUNTPOINT:
150 if (zfs_unmount(cn->cn_handle, NULL,
151 clp->cl_mflags) != 0) {
152 ret = -1;
153 cn->cn_needpost = B_FALSE;
154 }
155 break;
156 case ZFS_PROP_SHARESMB:
157 (void) zfs_unshare_smb(cn->cn_handle, NULL);
158 break;
159 }
160 }
161 }
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 only remount/reshare the filesystem if it was
175 * previously mounted/shared. Otherwise, we always remount/reshare the
176 * filesystem.
177 */
178 int
179 changelist_postfix(prop_changelist_t *clp)
180 {
181 prop_changenode_t *cn;
182 char shareopts[ZFS_MAXPROPLEN];
183 int errors = 0;
184 libzfs_handle_t *hdl;
185
186 /*
187 * If we're changing the mountpoint, attempt to destroy the underlying
188 * mountpoint. All other datasets will have inherited from this dataset
189 * (in which case their mountpoints exist in the filesystem in the new
190 * location), or have explicit mountpoints set (in which case they won't
191 * be in the changelist).
192 */
193 if ((cn = uu_list_last(clp->cl_list)) == NULL)
194 return (0);
195
196 if (clp->cl_prop == ZFS_PROP_MOUNTPOINT)
197 remove_mountpoint(cn->cn_handle);
198
199 /*
200 * It is possible that the changelist_prefix() used libshare
201 * to unshare some entries. Since libshare caches data, an
202 * attempt to reshare during postfix can fail unless libshare
203 * is uninitialized here so that it will reinitialize later.
204 */
205 if (cn->cn_handle != NULL) {
206 hdl = cn->cn_handle->zfs_hdl;
207 assert(hdl != NULL);
208 zfs_uninit_libshare(hdl);
209 }
210
211 /*
212 * We walk the datasets in reverse, because we want to mount any parent
213 * datasets before mounting the children. We walk all datasets even if
214 * there are errors.
215 */
216 for (cn = uu_list_last(clp->cl_list); cn != NULL;
217 cn = uu_list_prev(clp->cl_list, cn)) {
218
219 boolean_t sharenfs;
220 boolean_t sharesmb;
221 boolean_t mounted;
222
223 /*
224 * If we are in the global zone, but this dataset is exported
225 * to a local zone, do nothing.
226 */
227 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
228 continue;
229
230 /* Only do post-processing if it's required */
231 if (!cn->cn_needpost)
232 continue;
233 cn->cn_needpost = B_FALSE;
234
235 zfs_refresh_properties(cn->cn_handle);
236
237 if (ZFS_IS_VOLUME(cn->cn_handle)) {
238 /*
239 * If we're doing a rename, recreate the /dev/zvol
240 * links.
241 */
242 if (clp->cl_realprop == ZFS_PROP_NAME &&
243 zvol_create_link(cn->cn_handle->zfs_hdl,
244 cn->cn_handle->zfs_name) != 0) {
245 errors++;
246 } else if (cn->cn_shared ||
247 clp->cl_prop == ZFS_PROP_SHAREISCSI) {
248 if (zfs_prop_get(cn->cn_handle,
249 ZFS_PROP_SHAREISCSI, shareopts,
250 sizeof (shareopts), NULL, NULL, 0,
251 B_FALSE) == 0 &&
252 strcmp(shareopts, "off") == 0) {
253 errors +=
254 zfs_unshare_iscsi(cn->cn_handle);
255 } else {
256 errors +=
257 zfs_share_iscsi(cn->cn_handle);
258 }
259 }
260
261 continue;
262 }
263
264 /*
265 * Remount if previously mounted or mountpoint was legacy,
266 * or sharenfs or sharesmb property is set.
267 */
268 sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS,
269 shareopts, sizeof (shareopts), NULL, NULL, 0,
270 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
271
272 sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB,
273 shareopts, sizeof (shareopts), NULL, NULL, 0,
274 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
275
276 mounted = zfs_is_mounted(cn->cn_handle, NULL);
277
278 if (!mounted && (cn->cn_mounted ||
279 ((sharenfs || sharesmb || clp->cl_waslegacy) &&
280 (zfs_prop_get_int(cn->cn_handle,
281 ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON)))) {
282
283 if (zfs_mount(cn->cn_handle, NULL, 0) != 0)
284 errors++;
285 else
286 mounted = TRUE;
287 }
288
289 /*
290 * If the file system is mounted we always re-share even
291 * if the filesystem is currently shared, so that we can
292 * adopt any new options.
293 */
294 if (sharenfs && mounted)
295 errors += zfs_share_nfs(cn->cn_handle);
296 else if (cn->cn_shared || clp->cl_waslegacy)
297 errors += zfs_unshare_nfs(cn->cn_handle, NULL);
298 if (sharesmb && mounted)
299 errors += zfs_share_smb(cn->cn_handle);
300 else if (cn->cn_shared || clp->cl_waslegacy)
301 errors += zfs_unshare_smb(cn->cn_handle, NULL);
302 }
303
304 return (errors ? -1 : 0);
305 }
306
307 /*
308 * Is this "dataset" a child of "parent"?
309 */
310 boolean_t
311 isa_child_of(const char *dataset, const char *parent)
312 {
313 int len;
314
315 len = strlen(parent);
316
317 if (strncmp(dataset, parent, len) == 0 &&
318 (dataset[len] == '@' || dataset[len] == '/' ||
319 dataset[len] == '\0'))
320 return (B_TRUE);
321 else
322 return (B_FALSE);
323
324 }
325
326 /*
327 * If we rename a filesystem, child filesystem handles are no longer valid
328 * since we identify each dataset by its name in the ZFS namespace. As a
329 * result, we have to go through and fix up all the names appropriately. We
330 * could do this automatically if libzfs kept track of all open handles, but
331 * this is a lot less work.
332 */
333 void
334 changelist_rename(prop_changelist_t *clp, const char *src, const char *dst)
335 {
336 prop_changenode_t *cn;
337 char newname[ZFS_MAXNAMELEN];
338
339 for (cn = uu_list_first(clp->cl_list); cn != NULL;
340 cn = uu_list_next(clp->cl_list, cn)) {
341 /*
342 * Do not rename a clone that's not in the source hierarchy.
343 */
344 if (!isa_child_of(cn->cn_handle->zfs_name, src))
345 continue;
346
347 /*
348 * Destroy the previous mountpoint if needed.
349 */
350 remove_mountpoint(cn->cn_handle);
351
352 (void) strlcpy(newname, dst, sizeof (newname));
353 (void) strcat(newname, cn->cn_handle->zfs_name + strlen(src));
354
355 (void) strlcpy(cn->cn_handle->zfs_name, newname,
356 sizeof (cn->cn_handle->zfs_name));
357 }
358 }
359
360 /*
361 * Given a gathered changelist for the 'sharenfs' or 'sharesmb' property,
362 * unshare all the datasets in the list.
363 */
364 int
365 changelist_unshare(prop_changelist_t *clp, zfs_share_proto_t *proto)
366 {
367 prop_changenode_t *cn;
368 int ret = 0;
369
370 if (clp->cl_prop != ZFS_PROP_SHARENFS &&
371 clp->cl_prop != ZFS_PROP_SHARESMB)
372 return (0);
373
374 for (cn = uu_list_first(clp->cl_list); cn != NULL;
375 cn = uu_list_next(clp->cl_list, cn)) {
376 if (zfs_unshare_proto(cn->cn_handle, NULL, proto) != 0)
377 ret = -1;
378 }
379
380 return (ret);
381 }
382
383 /*
384 * Check if there is any child exported to a local zone in a given changelist.
385 * This information has already been recorded while gathering the changelist
386 * via changelist_gather().
387 */
388 int
389 changelist_haszonedchild(prop_changelist_t *clp)
390 {
391 return (clp->cl_haszonedchild);
392 }
393
394 /*
395 * Remove a node from a gathered list.
396 */
397 void
398 changelist_remove(prop_changelist_t *clp, const char *name)
399 {
400 prop_changenode_t *cn;
401
402 for (cn = uu_list_first(clp->cl_list); cn != NULL;
403 cn = uu_list_next(clp->cl_list, cn)) {
404
405 if (strcmp(cn->cn_handle->zfs_name, name) == 0) {
406 uu_list_remove(clp->cl_list, cn);
407 zfs_close(cn->cn_handle);
408 free(cn);
409 return;
410 }
411 }
412 }
413
414 /*
415 * Release any memory associated with a changelist.
416 */
417 void
418 changelist_free(prop_changelist_t *clp)
419 {
420 prop_changenode_t *cn;
421 void *cookie;
422
423 if (clp->cl_list) {
424 cookie = NULL;
425 while ((cn = uu_list_teardown(clp->cl_list, &cookie)) != NULL) {
426 zfs_close(cn->cn_handle);
427 free(cn);
428 }
429
430 uu_list_destroy(clp->cl_list);
431 }
432 if (clp->cl_pool)
433 uu_list_pool_destroy(clp->cl_pool);
434
435 free(clp);
436 }
437
438 static int
439 change_one(zfs_handle_t *zhp, void *data)
440 {
441 prop_changelist_t *clp = data;
442 char property[ZFS_MAXPROPLEN];
443 char where[64];
444 prop_changenode_t *cn;
445 zprop_source_t sourcetype;
446 zprop_source_t share_sourcetype;
447
448 /*
449 * We only want to unmount/unshare those filesystems that may inherit
450 * from the target filesystem. If we find any filesystem with a
451 * locally set mountpoint, we ignore any children since changing the
452 * property will not affect them. If this is a rename, we iterate
453 * over all children regardless, since we need them unmounted in
454 * order to do the rename. Also, if this is a volume and we're doing
455 * a rename, then always add it to the changelist.
456 */
457
458 if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) &&
459 zfs_prop_get(zhp, clp->cl_prop, property,
460 sizeof (property), &sourcetype, where, sizeof (where),
461 B_FALSE) != 0) {
462 zfs_close(zhp);
463 return (0);
464 }
465
466 /*
467 * If we are "watching" sharenfs or sharesmb
468 * then check out the companion property which is tracked
469 * in cl_shareprop
470 */
471 if (clp->cl_shareprop != ZPROP_INVAL &&
472 zfs_prop_get(zhp, clp->cl_shareprop, property,
473 sizeof (property), &share_sourcetype, where, sizeof (where),
474 B_FALSE) != 0) {
475 zfs_close(zhp);
476 return (0);
477 }
478
479 if (clp->cl_alldependents || clp->cl_allchildren ||
480 sourcetype == ZPROP_SRC_DEFAULT ||
481 sourcetype == ZPROP_SRC_INHERITED ||
482 (clp->cl_shareprop != ZPROP_INVAL &&
483 (share_sourcetype == ZPROP_SRC_DEFAULT ||
484 share_sourcetype == ZPROP_SRC_INHERITED))) {
485 if ((cn = zfs_alloc(zfs_get_handle(zhp),
486 sizeof (prop_changenode_t))) == NULL) {
487 zfs_close(zhp);
488 return (-1);
489 }
490
491 cn->cn_handle = zhp;
492 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
493 zfs_is_mounted(zhp, NULL);
494 cn->cn_shared = zfs_is_shared(zhp);
495 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
496 cn->cn_needpost = B_TRUE;
497
498 /* Indicate if any child is exported to a local zone. */
499 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
500 clp->cl_haszonedchild = B_TRUE;
501
502 uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
503
504 if (clp->cl_sorted) {
505 uu_list_index_t idx;
506
507 (void) uu_list_find(clp->cl_list, cn, NULL,
508 &idx);
509 uu_list_insert(clp->cl_list, cn, idx);
510 } else {
511 /*
512 * Add this child to beginning of the list. Children
513 * below this one in the hierarchy will get added above
514 * this one in the list. This produces a list in
515 * reverse dataset name order.
516 * This is necessary when the original mountpoint
517 * is legacy or none.
518 */
519 ASSERT(!clp->cl_alldependents);
520 verify(uu_list_insert_before(clp->cl_list,
521 uu_list_first(clp->cl_list), cn) == 0);
522 }
523
524 if (!clp->cl_alldependents)
525 return (zfs_iter_children(zhp, change_one, data));
526 } else {
527 zfs_close(zhp);
528 }
529
530 return (0);
531 }
532
533 /*ARGSUSED*/
534 static int
535 compare_mountpoints(const void *a, const void *b, void *unused)
536 {
537 const prop_changenode_t *ca = a;
538 const prop_changenode_t *cb = b;
539
540 char mounta[MAXPATHLEN];
541 char mountb[MAXPATHLEN];
542
543 boolean_t hasmounta, hasmountb;
544
545 /*
546 * When unsharing or unmounting filesystems, we need to do it in
547 * mountpoint order. This allows the user to have a mountpoint
548 * hierarchy that is different from the dataset hierarchy, and still
549 * allow it to be changed. However, if either dataset doesn't have a
550 * mountpoint (because it is a volume or a snapshot), we place it at the
551 * end of the list, because it doesn't affect our change at all.
552 */
553 hasmounta = (zfs_prop_get(ca->cn_handle, ZFS_PROP_MOUNTPOINT, mounta,
554 sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
555 hasmountb = (zfs_prop_get(cb->cn_handle, ZFS_PROP_MOUNTPOINT, mountb,
556 sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
557
558 if (!hasmounta && hasmountb)
559 return (-1);
560 else if (hasmounta && !hasmountb)
561 return (1);
562 else if (!hasmounta && !hasmountb)
563 return (0);
564 else
565 return (strcmp(mountb, mounta));
566 }
567
568 /*
569 * Given a ZFS handle and a property, construct a complete list of datasets
570 * that need to be modified as part of this process. For anything but the
571 * 'mountpoint' and 'sharenfs' properties, this just returns an empty list.
572 * Otherwise, we iterate over all children and look for any datasets that
573 * inherit the property. For each such dataset, we add it to the list and
574 * mark whether it was shared beforehand.
575 */
576 prop_changelist_t *
577 changelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int gather_flags,
578 int mnt_flags)
579 {
580 prop_changelist_t *clp;
581 prop_changenode_t *cn;
582 zfs_handle_t *temp;
583 char property[ZFS_MAXPROPLEN];
584 uu_compare_fn_t *compare = NULL;
585 boolean_t legacy = B_FALSE;
586
587 if ((clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t))) == NULL)
588 return (NULL);
589
590 /*
591 * For mountpoint-related tasks, we want to sort everything by
592 * mountpoint, so that we mount and unmount them in the appropriate
593 * order, regardless of their position in the hierarchy.
594 */
595 if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED ||
596 prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS ||
597 prop == ZFS_PROP_SHARESMB) {
598
599 if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
600 property, sizeof (property),
601 NULL, NULL, 0, B_FALSE) == 0 &&
602 (strcmp(property, "legacy") == 0 ||
603 strcmp(property, "none") == 0)) {
604
605 legacy = B_TRUE;
606 }
607 if (!legacy) {
608 compare = compare_mountpoints;
609 clp->cl_sorted = B_TRUE;
610 }
611 }
612
613 clp->cl_pool = uu_list_pool_create("changelist_pool",
614 sizeof (prop_changenode_t),
615 offsetof(prop_changenode_t, cn_listnode),
616 compare, 0);
617 if (clp->cl_pool == NULL) {
618 assert(uu_error() == UU_ERROR_NO_MEMORY);
619 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
620 changelist_free(clp);
621 return (NULL);
622 }
623
624 clp->cl_list = uu_list_create(clp->cl_pool, NULL,
625 clp->cl_sorted ? UU_LIST_SORTED : 0);
626 clp->cl_gflags = gather_flags;
627 clp->cl_mflags = mnt_flags;
628
629 if (clp->cl_list == NULL) {
630 assert(uu_error() == UU_ERROR_NO_MEMORY);
631 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
632 changelist_free(clp);
633 return (NULL);
634 }
635
636 /*
637 * If this is a rename or the 'zoned' property, we pretend we're
638 * changing the mountpoint and flag it so we can catch all children in
639 * change_one().
640 *
641 * Flag cl_alldependents to catch all children plus the dependents
642 * (clones) that are not in the hierarchy.
643 */
644 if (prop == ZFS_PROP_NAME) {
645 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
646 clp->cl_alldependents = B_TRUE;
647 } else if (prop == ZFS_PROP_ZONED) {
648 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
649 clp->cl_allchildren = B_TRUE;
650 } else if (prop == ZFS_PROP_CANMOUNT) {
651 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
652 } else if (prop == ZFS_PROP_VOLSIZE) {
653 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
654 } else {
655 clp->cl_prop = prop;
656 }
657 clp->cl_realprop = prop;
658
659 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
660 clp->cl_prop != ZFS_PROP_SHARENFS &&
661 clp->cl_prop != ZFS_PROP_SHARESMB &&
662 clp->cl_prop != ZFS_PROP_SHAREISCSI)
663 return (clp);
664
665 /*
666 * If watching SHARENFS or SHARESMB then
667 * also watch its companion property.
668 */
669 if (clp->cl_prop == ZFS_PROP_SHARENFS)
670 clp->cl_shareprop = ZFS_PROP_SHARESMB;
671 else if (clp->cl_prop == ZFS_PROP_SHARESMB)
672 clp->cl_shareprop = ZFS_PROP_SHARENFS;
673
674 if (clp->cl_alldependents) {
675 if (zfs_iter_dependents(zhp, B_TRUE, change_one, clp) != 0) {
676 changelist_free(clp);
677 return (NULL);
678 }
679 } else if (zfs_iter_children(zhp, change_one, clp) != 0) {
680 changelist_free(clp);
681 return (NULL);
682 }
683
684 /*
685 * We have to re-open ourselves because we auto-close all the handles
686 * and can't tell the difference.
687 */
688 if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp),
689 ZFS_TYPE_DATASET)) == NULL) {
690 changelist_free(clp);
691 return (NULL);
692 }
693
694 /*
695 * Always add ourself to the list. We add ourselves to the end so that
696 * we're the last to be unmounted.
697 */
698 if ((cn = zfs_alloc(zhp->zfs_hdl,
699 sizeof (prop_changenode_t))) == NULL) {
700 zfs_close(temp);
701 changelist_free(clp);
702 return (NULL);
703 }
704
705 cn->cn_handle = temp;
706 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
707 zfs_is_mounted(temp, NULL);
708 cn->cn_shared = zfs_is_shared(temp);
709 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
710 cn->cn_needpost = B_TRUE;
711
712 uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
713 if (clp->cl_sorted) {
714 uu_list_index_t idx;
715 (void) uu_list_find(clp->cl_list, cn, NULL, &idx);
716 uu_list_insert(clp->cl_list, cn, idx);
717 } else {
718 /*
719 * Add the target dataset to the end of the list.
720 * The list is not really unsorted. The list will be
721 * in reverse dataset name order. This is necessary
722 * when the original mountpoint is legacy or none.
723 */
724 verify(uu_list_insert_after(clp->cl_list,
725 uu_list_last(clp->cl_list), cn) == 0);
726 }
727
728 /*
729 * If the mountpoint property was previously 'legacy', or 'none',
730 * record it as the behavior of changelist_postfix() will be different.
731 */
732 if ((clp->cl_prop == ZFS_PROP_MOUNTPOINT) && legacy) {
733 /*
734 * do not automatically mount ex-legacy datasets if
735 * we specifically set canmount to noauto
736 */
737 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) !=
738 ZFS_CANMOUNT_NOAUTO)
739 clp->cl_waslegacy = B_TRUE;
740 }
741
742 return (clp);
743 }