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
changelist_prefix(prop_changelist_t * clp)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 /* If this was a rename, unshare the zvol */
123 (void) zfs_unshare_iscsi(cn->cn_handle);
124 break;
125
126 case ZFS_PROP_VOLSIZE:
127 /*
128 * If this was a change to the volume size, we
129 * need to unshare and reshare the volume.
130 */
131 (void) zfs_unshare_iscsi(cn->cn_handle);
132 break;
133 }
134 } else {
135 /*
136 * Do the property specific processing.
137 */
138 switch (clp->cl_prop) {
139 case ZFS_PROP_MOUNTPOINT:
140 if (zfs_unmount(cn->cn_handle, NULL,
141 clp->cl_mflags) != 0) {
142 ret = -1;
143 cn->cn_needpost = B_FALSE;
144 }
145 break;
146 case ZFS_PROP_SHARESMB:
147 (void) zfs_unshare_smb(cn->cn_handle, NULL);
148 break;
149 }
150 }
151 }
152
153 if (ret == -1)
154 (void) changelist_postfix(clp);
155
156 return (ret);
157 }
158
159 /*
160 * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or
161 * reshare the filesystems as necessary. In changelist_gather() we recorded
162 * whether the filesystem was previously shared or mounted. The action we take
163 * depends on the previous state, and whether the value was previously 'legacy'.
164 * For non-legacy properties, we only remount/reshare the filesystem if it was
165 * previously mounted/shared. Otherwise, we always remount/reshare the
166 * filesystem.
167 */
168 int
changelist_postfix(prop_changelist_t * clp)169 changelist_postfix(prop_changelist_t *clp)
170 {
171 prop_changenode_t *cn;
172 char shareopts[ZFS_MAXPROPLEN];
173 int errors = 0;
174 libzfs_handle_t *hdl;
175
176 /*
177 * If we're changing the mountpoint, attempt to destroy the underlying
178 * mountpoint. All other datasets will have inherited from this dataset
179 * (in which case their mountpoints exist in the filesystem in the new
180 * location), or have explicit mountpoints set (in which case they won't
181 * be in the changelist).
182 */
183 if ((cn = uu_list_last(clp->cl_list)) == NULL)
184 return (0);
185
186 if (clp->cl_prop == ZFS_PROP_MOUNTPOINT)
187 remove_mountpoint(cn->cn_handle);
188
189 /*
190 * It is possible that the changelist_prefix() used libshare
191 * to unshare some entries. Since libshare caches data, an
192 * attempt to reshare during postfix can fail unless libshare
193 * is uninitialized here so that it will reinitialize later.
194 */
195 if (cn->cn_handle != NULL) {
196 hdl = cn->cn_handle->zfs_hdl;
197 assert(hdl != NULL);
198 zfs_uninit_libshare(hdl);
199 }
200
201 /*
202 * We walk the datasets in reverse, because we want to mount any parent
203 * datasets before mounting the children. We walk all datasets even if
204 * there are errors.
205 */
206 for (cn = uu_list_last(clp->cl_list); cn != NULL;
207 cn = uu_list_prev(clp->cl_list, cn)) {
208
209 boolean_t sharenfs;
210 boolean_t sharesmb;
211 boolean_t mounted;
212
213 /*
214 * If we are in the global zone, but this dataset is exported
215 * to a local zone, do nothing.
216 */
217 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
218 continue;
219
220 /* Only do post-processing if it's required */
221 if (!cn->cn_needpost)
222 continue;
223 cn->cn_needpost = B_FALSE;
224
225 zfs_refresh_properties(cn->cn_handle);
226
227 if (ZFS_IS_VOLUME(cn->cn_handle)) {
228 if (cn->cn_shared ||
229 clp->cl_prop == ZFS_PROP_SHAREISCSI) {
230 if (zfs_prop_get(cn->cn_handle,
231 ZFS_PROP_SHAREISCSI, shareopts,
232 sizeof (shareopts), NULL, NULL, 0,
233 B_FALSE) == 0 &&
234 strcmp(shareopts, "off") == 0) {
235 errors +=
236 zfs_unshare_iscsi(cn->cn_handle);
237 } else {
238 errors +=
239 zfs_share_iscsi(cn->cn_handle);
240 }
241 }
242
243 continue;
244 }
245
246 /*
247 * Remount if previously mounted or mountpoint was legacy,
248 * or sharenfs or sharesmb property is set.
249 */
250 sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS,
251 shareopts, sizeof (shareopts), NULL, NULL, 0,
252 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
253
254 sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB,
255 shareopts, sizeof (shareopts), NULL, NULL, 0,
256 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
257
258 mounted = zfs_is_mounted(cn->cn_handle, NULL);
259
260 if (!mounted && (cn->cn_mounted ||
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 errors++;
267 else
268 mounted = TRUE;
269 }
270
271 /*
272 * If the file system is mounted we always re-share even
273 * if the filesystem is currently shared, so that we can
274 * adopt any new options.
275 */
276 if (sharenfs && mounted)
277 errors += zfs_share_nfs(cn->cn_handle);
278 else if (cn->cn_shared || clp->cl_waslegacy)
279 errors += zfs_unshare_nfs(cn->cn_handle, NULL);
280 if (sharesmb && mounted)
281 errors += zfs_share_smb(cn->cn_handle);
282 else if (cn->cn_shared || clp->cl_waslegacy)
283 errors += zfs_unshare_smb(cn->cn_handle, NULL);
284 }
285
286 return (errors ? -1 : 0);
287 }
288
289 /*
290 * Is this "dataset" a child of "parent"?
291 */
292 boolean_t
isa_child_of(const char * dataset,const char * parent)293 isa_child_of(const char *dataset, const char *parent)
294 {
295 int len;
296
297 len = strlen(parent);
298
299 if (strncmp(dataset, parent, len) == 0 &&
300 (dataset[len] == '@' || dataset[len] == '/' ||
301 dataset[len] == '\0'))
302 return (B_TRUE);
303 else
304 return (B_FALSE);
305
306 }
307
308 /*
309 * If we rename a filesystem, child filesystem handles are no longer valid
310 * since we identify each dataset by its name in the ZFS namespace. As a
311 * result, we have to go through and fix up all the names appropriately. We
312 * could do this automatically if libzfs kept track of all open handles, but
313 * this is a lot less work.
314 */
315 void
changelist_rename(prop_changelist_t * clp,const char * src,const char * dst)316 changelist_rename(prop_changelist_t *clp, const char *src, const char *dst)
317 {
318 prop_changenode_t *cn;
319 char newname[ZFS_MAXNAMELEN];
320
321 for (cn = uu_list_first(clp->cl_list); cn != NULL;
322 cn = uu_list_next(clp->cl_list, cn)) {
323 /*
324 * Do not rename a clone that's not in the source hierarchy.
325 */
326 if (!isa_child_of(cn->cn_handle->zfs_name, src))
327 continue;
328
329 /*
330 * Destroy the previous mountpoint if needed.
331 */
332 remove_mountpoint(cn->cn_handle);
333
334 (void) strlcpy(newname, dst, sizeof (newname));
335 (void) strcat(newname, cn->cn_handle->zfs_name + strlen(src));
336
337 (void) strlcpy(cn->cn_handle->zfs_name, newname,
338 sizeof (cn->cn_handle->zfs_name));
339 }
340 }
341
342 /*
343 * Given a gathered changelist for the 'sharenfs' or 'sharesmb' property,
344 * unshare all the datasets in the list.
345 */
346 int
changelist_unshare(prop_changelist_t * clp,zfs_share_proto_t * proto)347 changelist_unshare(prop_changelist_t *clp, zfs_share_proto_t *proto)
348 {
349 prop_changenode_t *cn;
350 int ret = 0;
351
352 if (clp->cl_prop != ZFS_PROP_SHARENFS &&
353 clp->cl_prop != ZFS_PROP_SHARESMB)
354 return (0);
355
356 for (cn = uu_list_first(clp->cl_list); cn != NULL;
357 cn = uu_list_next(clp->cl_list, cn)) {
358 if (zfs_unshare_proto(cn->cn_handle, NULL, proto) != 0)
359 ret = -1;
360 }
361
362 return (ret);
363 }
364
365 /*
366 * Check if there is any child exported to a local zone in a given changelist.
367 * This information has already been recorded while gathering the changelist
368 * via changelist_gather().
369 */
370 int
changelist_haszonedchild(prop_changelist_t * clp)371 changelist_haszonedchild(prop_changelist_t *clp)
372 {
373 return (clp->cl_haszonedchild);
374 }
375
376 /*
377 * Remove a node from a gathered list.
378 */
379 void
changelist_remove(prop_changelist_t * clp,const char * name)380 changelist_remove(prop_changelist_t *clp, const char *name)
381 {
382 prop_changenode_t *cn;
383
384 for (cn = uu_list_first(clp->cl_list); cn != NULL;
385 cn = uu_list_next(clp->cl_list, cn)) {
386
387 if (strcmp(cn->cn_handle->zfs_name, name) == 0) {
388 uu_list_remove(clp->cl_list, cn);
389 zfs_close(cn->cn_handle);
390 free(cn);
391 return;
392 }
393 }
394 }
395
396 /*
397 * Release any memory associated with a changelist.
398 */
399 void
changelist_free(prop_changelist_t * clp)400 changelist_free(prop_changelist_t *clp)
401 {
402 prop_changenode_t *cn;
403 void *cookie;
404
405 if (clp->cl_list) {
406 cookie = NULL;
407 while ((cn = uu_list_teardown(clp->cl_list, &cookie)) != NULL) {
408 zfs_close(cn->cn_handle);
409 free(cn);
410 }
411
412 uu_list_destroy(clp->cl_list);
413 }
414 if (clp->cl_pool)
415 uu_list_pool_destroy(clp->cl_pool);
416
417 free(clp);
418 }
419
420 static int
change_one(zfs_handle_t * zhp,void * data)421 change_one(zfs_handle_t *zhp, void *data)
422 {
423 prop_changelist_t *clp = data;
424 char property[ZFS_MAXPROPLEN];
425 char where[64];
426 prop_changenode_t *cn;
427 zprop_source_t sourcetype;
428 zprop_source_t share_sourcetype;
429
430 /*
431 * We only want to unmount/unshare those filesystems that may inherit
432 * from the target filesystem. If we find any filesystem with a
433 * locally set mountpoint, we ignore any children since changing the
434 * property will not affect them. If this is a rename, we iterate
435 * over all children regardless, since we need them unmounted in
436 * order to do the rename. Also, if this is a volume and we're doing
437 * a rename, then always add it to the changelist.
438 */
439
440 if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) &&
441 zfs_prop_get(zhp, clp->cl_prop, property,
442 sizeof (property), &sourcetype, where, sizeof (where),
443 B_FALSE) != 0) {
444 zfs_close(zhp);
445 return (0);
446 }
447
448 /*
449 * If we are "watching" sharenfs or sharesmb
450 * then check out the companion property which is tracked
451 * in cl_shareprop
452 */
453 if (clp->cl_shareprop != ZPROP_INVAL &&
454 zfs_prop_get(zhp, clp->cl_shareprop, property,
455 sizeof (property), &share_sourcetype, where, sizeof (where),
456 B_FALSE) != 0) {
457 zfs_close(zhp);
458 return (0);
459 }
460
461 if (clp->cl_alldependents || clp->cl_allchildren ||
462 sourcetype == ZPROP_SRC_DEFAULT ||
463 sourcetype == ZPROP_SRC_INHERITED ||
464 (clp->cl_shareprop != ZPROP_INVAL &&
465 (share_sourcetype == ZPROP_SRC_DEFAULT ||
466 share_sourcetype == ZPROP_SRC_INHERITED))) {
467 if ((cn = zfs_alloc(zfs_get_handle(zhp),
468 sizeof (prop_changenode_t))) == NULL) {
469 zfs_close(zhp);
470 return (-1);
471 }
472
473 cn->cn_handle = zhp;
474 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
475 zfs_is_mounted(zhp, NULL);
476 cn->cn_shared = zfs_is_shared(zhp);
477 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
478 cn->cn_needpost = B_TRUE;
479
480 /* Indicate if any child is exported to a local zone. */
481 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
482 clp->cl_haszonedchild = B_TRUE;
483
484 uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
485
486 if (clp->cl_sorted) {
487 uu_list_index_t idx;
488
489 (void) uu_list_find(clp->cl_list, cn, NULL,
490 &idx);
491 uu_list_insert(clp->cl_list, cn, idx);
492 } else {
493 /*
494 * Add this child to beginning of the list. Children
495 * below this one in the hierarchy will get added above
496 * this one in the list. This produces a list in
497 * reverse dataset name order.
498 * This is necessary when the original mountpoint
499 * is legacy or none.
500 */
501 ASSERT(!clp->cl_alldependents);
502 verify(uu_list_insert_before(clp->cl_list,
503 uu_list_first(clp->cl_list), cn) == 0);
504 }
505
506 if (!clp->cl_alldependents)
507 return (zfs_iter_children(zhp, change_one, data));
508 } else {
509 zfs_close(zhp);
510 }
511
512 return (0);
513 }
514
515 /*ARGSUSED*/
516 static int
compare_mountpoints(const void * a,const void * b,void * unused)517 compare_mountpoints(const void *a, const void *b, void *unused)
518 {
519 const prop_changenode_t *ca = a;
520 const prop_changenode_t *cb = b;
521
522 char mounta[MAXPATHLEN];
523 char mountb[MAXPATHLEN];
524
525 boolean_t hasmounta, hasmountb;
526
527 /*
528 * When unsharing or unmounting filesystems, we need to do it in
529 * mountpoint order. This allows the user to have a mountpoint
530 * hierarchy that is different from the dataset hierarchy, and still
531 * allow it to be changed. However, if either dataset doesn't have a
532 * mountpoint (because it is a volume or a snapshot), we place it at the
533 * end of the list, because it doesn't affect our change at all.
534 */
535 hasmounta = (zfs_prop_get(ca->cn_handle, ZFS_PROP_MOUNTPOINT, mounta,
536 sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
537 hasmountb = (zfs_prop_get(cb->cn_handle, ZFS_PROP_MOUNTPOINT, mountb,
538 sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
539
540 if (!hasmounta && hasmountb)
541 return (-1);
542 else if (hasmounta && !hasmountb)
543 return (1);
544 else if (!hasmounta && !hasmountb)
545 return (0);
546 else
547 return (strcmp(mountb, mounta));
548 }
549
550 /*
551 * Given a ZFS handle and a property, construct a complete list of datasets
552 * that need to be modified as part of this process. For anything but the
553 * 'mountpoint' and 'sharenfs' properties, this just returns an empty list.
554 * Otherwise, we iterate over all children and look for any datasets that
555 * inherit the property. For each such dataset, we add it to the list and
556 * mark whether it was shared beforehand.
557 */
558 prop_changelist_t *
changelist_gather(zfs_handle_t * zhp,zfs_prop_t prop,int gather_flags,int mnt_flags)559 changelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int gather_flags,
560 int mnt_flags)
561 {
562 prop_changelist_t *clp;
563 prop_changenode_t *cn;
564 zfs_handle_t *temp;
565 char property[ZFS_MAXPROPLEN];
566 uu_compare_fn_t *compare = NULL;
567 boolean_t legacy = B_FALSE;
568
569 if ((clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t))) == NULL)
570 return (NULL);
571
572 /*
573 * For mountpoint-related tasks, we want to sort everything by
574 * mountpoint, so that we mount and unmount them in the appropriate
575 * order, regardless of their position in the hierarchy.
576 */
577 if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED ||
578 prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS ||
579 prop == ZFS_PROP_SHARESMB) {
580
581 if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
582 property, sizeof (property),
583 NULL, NULL, 0, B_FALSE) == 0 &&
584 (strcmp(property, "legacy") == 0 ||
585 strcmp(property, "none") == 0)) {
586
587 legacy = B_TRUE;
588 }
589 if (!legacy) {
590 compare = compare_mountpoints;
591 clp->cl_sorted = B_TRUE;
592 }
593 }
594
595 clp->cl_pool = uu_list_pool_create("changelist_pool",
596 sizeof (prop_changenode_t),
597 offsetof(prop_changenode_t, cn_listnode),
598 compare, 0);
599 if (clp->cl_pool == NULL) {
600 assert(uu_error() == UU_ERROR_NO_MEMORY);
601 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
602 changelist_free(clp);
603 return (NULL);
604 }
605
606 clp->cl_list = uu_list_create(clp->cl_pool, NULL,
607 clp->cl_sorted ? UU_LIST_SORTED : 0);
608 clp->cl_gflags = gather_flags;
609 clp->cl_mflags = mnt_flags;
610
611 if (clp->cl_list == NULL) {
612 assert(uu_error() == UU_ERROR_NO_MEMORY);
613 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
614 changelist_free(clp);
615 return (NULL);
616 }
617
618 /*
619 * If this is a rename or the 'zoned' property, we pretend we're
620 * changing the mountpoint and flag it so we can catch all children in
621 * change_one().
622 *
623 * Flag cl_alldependents to catch all children plus the dependents
624 * (clones) that are not in the hierarchy.
625 */
626 if (prop == ZFS_PROP_NAME) {
627 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
628 clp->cl_alldependents = B_TRUE;
629 } else if (prop == ZFS_PROP_ZONED) {
630 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
631 clp->cl_allchildren = B_TRUE;
632 } else if (prop == ZFS_PROP_CANMOUNT) {
633 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
634 } else if (prop == ZFS_PROP_VOLSIZE) {
635 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
636 } else {
637 clp->cl_prop = prop;
638 }
639 clp->cl_realprop = prop;
640
641 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
642 clp->cl_prop != ZFS_PROP_SHARENFS &&
643 clp->cl_prop != ZFS_PROP_SHARESMB &&
644 clp->cl_prop != ZFS_PROP_SHAREISCSI)
645 return (clp);
646
647 /*
648 * If watching SHARENFS or SHARESMB then
649 * also watch its companion property.
650 */
651 if (clp->cl_prop == ZFS_PROP_SHARENFS)
652 clp->cl_shareprop = ZFS_PROP_SHARESMB;
653 else if (clp->cl_prop == ZFS_PROP_SHARESMB)
654 clp->cl_shareprop = ZFS_PROP_SHARENFS;
655
656 if (clp->cl_alldependents) {
657 if (zfs_iter_dependents(zhp, B_TRUE, change_one, clp) != 0) {
658 changelist_free(clp);
659 return (NULL);
660 }
661 } else if (zfs_iter_children(zhp, change_one, clp) != 0) {
662 changelist_free(clp);
663 return (NULL);
664 }
665
666 /*
667 * We have to re-open ourselves because we auto-close all the handles
668 * and can't tell the difference.
669 */
670 if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp),
671 ZFS_TYPE_DATASET)) == NULL) {
672 changelist_free(clp);
673 return (NULL);
674 }
675
676 /*
677 * Always add ourself to the list. We add ourselves to the end so that
678 * we're the last to be unmounted.
679 */
680 if ((cn = zfs_alloc(zhp->zfs_hdl,
681 sizeof (prop_changenode_t))) == NULL) {
682 zfs_close(temp);
683 changelist_free(clp);
684 return (NULL);
685 }
686
687 cn->cn_handle = temp;
688 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
689 zfs_is_mounted(temp, NULL);
690 cn->cn_shared = zfs_is_shared(temp);
691 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
692 cn->cn_needpost = B_TRUE;
693
694 uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
695 if (clp->cl_sorted) {
696 uu_list_index_t idx;
697 (void) uu_list_find(clp->cl_list, cn, NULL, &idx);
698 uu_list_insert(clp->cl_list, cn, idx);
699 } else {
700 /*
701 * Add the target dataset to the end of the list.
702 * The list is not really unsorted. The list will be
703 * in reverse dataset name order. This is necessary
704 * when the original mountpoint is legacy or none.
705 */
706 verify(uu_list_insert_after(clp->cl_list,
707 uu_list_last(clp->cl_list), cn) == 0);
708 }
709
710 /*
711 * If the mountpoint property was previously 'legacy', or 'none',
712 * record it as the behavior of changelist_postfix() will be different.
713 */
714 if ((clp->cl_prop == ZFS_PROP_MOUNTPOINT) && legacy) {
715 /*
716 * do not automatically mount ex-legacy datasets if
717 * we specifically set canmount to noauto
718 */
719 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) !=
720 ZFS_CANMOUNT_NOAUTO)
721 clp->cl_waslegacy = B_TRUE;
722 }
723
724 return (clp);
725 }
726