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 2010 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 /*
121 * Do the property specific processing.
122 */
123 switch (clp->cl_prop) {
124 case ZFS_PROP_MOUNTPOINT:
125 if (zfs_unmount(cn->cn_handle, NULL,
126 clp->cl_mflags) != 0) {
127 ret = -1;
128 cn->cn_needpost = B_FALSE;
129 }
130 break;
131 case ZFS_PROP_SHARESMB:
132 (void) zfs_unshare_smb(cn->cn_handle, NULL);
133 break;
134 }
135 }
136 }
137
138 if (ret == -1)
139 (void) changelist_postfix(clp);
140
141 return (ret);
142 }
143
144 /*
145 * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or
146 * reshare the filesystems as necessary. In changelist_gather() we recorded
147 * whether the filesystem was previously shared or mounted. The action we take
148 * depends on the previous state, and whether the value was previously 'legacy'.
149 * For non-legacy properties, we only remount/reshare the filesystem if it was
150 * previously mounted/shared. Otherwise, we always remount/reshare the
151 * filesystem.
152 */
153 int
154 changelist_postfix(prop_changelist_t *clp)
155 {
156 prop_changenode_t *cn;
157 char shareopts[ZFS_MAXPROPLEN];
158 int errors = 0;
159 libzfs_handle_t *hdl;
160
161 /*
162 * If we're changing the mountpoint, attempt to destroy the underlying
163 * mountpoint. All other datasets will have inherited from this dataset
164 * (in which case their mountpoints exist in the filesystem in the new
165 * location), or have explicit mountpoints set (in which case they won't
166 * be in the changelist).
167 */
168 if ((cn = uu_list_last(clp->cl_list)) == NULL)
169 return (0);
170
171 if (clp->cl_prop == ZFS_PROP_MOUNTPOINT)
172 remove_mountpoint(cn->cn_handle);
173
174 /*
175 * It is possible that the changelist_prefix() used libshare
176 * to unshare some entries. Since libshare caches data, an
177 * attempt to reshare during postfix can fail unless libshare
178 * is uninitialized here so that it will reinitialize later.
179 */
180 if (cn->cn_handle != NULL) {
181 hdl = cn->cn_handle->zfs_hdl;
182 assert(hdl != NULL);
183 zfs_uninit_libshare(hdl);
184 }
185
186 /*
187 * We walk the datasets in reverse, because we want to mount any parent
188 * datasets before mounting the children. We walk all datasets even if
189 * there are errors.
190 */
191 for (cn = uu_list_last(clp->cl_list); cn != NULL;
192 cn = uu_list_prev(clp->cl_list, cn)) {
193
194 boolean_t sharenfs;
195 boolean_t sharesmb;
196 boolean_t mounted;
197
198 /*
199 * If we are in the global zone, but this dataset is exported
200 * to a local zone, do nothing.
201 */
202 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
203 continue;
204
205 /* Only do post-processing if it's required */
206 if (!cn->cn_needpost)
207 continue;
208 cn->cn_needpost = B_FALSE;
209
210 zfs_refresh_properties(cn->cn_handle);
211
212 if (ZFS_IS_VOLUME(cn->cn_handle))
213 continue;
214
215 /*
216 * Remount if previously mounted or mountpoint was legacy,
217 * or sharenfs or sharesmb property is set.
218 */
219 sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS,
220 shareopts, sizeof (shareopts), NULL, NULL, 0,
221 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
222
223 sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB,
224 shareopts, sizeof (shareopts), NULL, NULL, 0,
225 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
226
227 mounted = zfs_is_mounted(cn->cn_handle, NULL);
228
229 if (!mounted && (cn->cn_mounted ||
230 ((sharenfs || sharesmb || clp->cl_waslegacy) &&
231 (zfs_prop_get_int(cn->cn_handle,
232 ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON)))) {
233
234 if (zfs_mount(cn->cn_handle, NULL, 0) != 0)
235 errors++;
236 else
237 mounted = TRUE;
238 }
239
240 /*
241 * If the file system is mounted we always re-share even
242 * if the filesystem is currently shared, so that we can
243 * adopt any new options.
244 */
245 if (sharenfs && mounted)
246 errors += zfs_share_nfs(cn->cn_handle);
247 else if (cn->cn_shared || clp->cl_waslegacy)
248 errors += zfs_unshare_nfs(cn->cn_handle, NULL);
249 if (sharesmb && mounted)
250 errors += zfs_share_smb(cn->cn_handle);
251 else if (cn->cn_shared || clp->cl_waslegacy)
252 errors += zfs_unshare_smb(cn->cn_handle, NULL);
253 }
254
255 return (errors ? -1 : 0);
256 }
257
258 /*
259 * Is this "dataset" a child of "parent"?
260 */
261 boolean_t
262 isa_child_of(const char *dataset, const char *parent)
263 {
264 int len;
265
266 len = strlen(parent);
267
268 if (strncmp(dataset, parent, len) == 0 &&
269 (dataset[len] == '@' || dataset[len] == '/' ||
270 dataset[len] == '\0'))
271 return (B_TRUE);
272 else
273 return (B_FALSE);
274
275 }
276
277 /*
278 * If we rename a filesystem, child filesystem handles are no longer valid
279 * since we identify each dataset by its name in the ZFS namespace. As a
280 * result, we have to go through and fix up all the names appropriately. We
281 * could do this automatically if libzfs kept track of all open handles, but
282 * this is a lot less work.
283 */
284 void
285 changelist_rename(prop_changelist_t *clp, const char *src, const char *dst)
286 {
287 prop_changenode_t *cn;
288 char newname[ZFS_MAXNAMELEN];
289
290 for (cn = uu_list_first(clp->cl_list); cn != NULL;
291 cn = uu_list_next(clp->cl_list, cn)) {
292 /*
293 * Do not rename a clone that's not in the source hierarchy.
294 */
295 if (!isa_child_of(cn->cn_handle->zfs_name, src))
296 continue;
297
298 /*
299 * Destroy the previous mountpoint if needed.
300 */
301 remove_mountpoint(cn->cn_handle);
302
303 (void) strlcpy(newname, dst, sizeof (newname));
304 (void) strcat(newname, cn->cn_handle->zfs_name + strlen(src));
305
306 (void) strlcpy(cn->cn_handle->zfs_name, newname,
307 sizeof (cn->cn_handle->zfs_name));
308 }
309 }
310
311 /*
312 * Given a gathered changelist for the 'sharenfs' or 'sharesmb' property,
313 * unshare all the datasets in the list.
314 */
315 int
316 changelist_unshare(prop_changelist_t *clp, zfs_share_proto_t *proto)
317 {
318 prop_changenode_t *cn;
319 int ret = 0;
320
321 if (clp->cl_prop != ZFS_PROP_SHARENFS &&
322 clp->cl_prop != ZFS_PROP_SHARESMB)
323 return (0);
324
325 for (cn = uu_list_first(clp->cl_list); cn != NULL;
326 cn = uu_list_next(clp->cl_list, cn)) {
327 if (zfs_unshare_proto(cn->cn_handle, NULL, proto) != 0)
328 ret = -1;
329 }
330
331 return (ret);
332 }
333
334 /*
335 * Check if there is any child exported to a local zone in a given changelist.
336 * This information has already been recorded while gathering the changelist
337 * via changelist_gather().
338 */
339 int
340 changelist_haszonedchild(prop_changelist_t *clp)
341 {
342 return (clp->cl_haszonedchild);
343 }
344
345 /*
346 * Remove a node from a gathered list.
347 */
348 void
349 changelist_remove(prop_changelist_t *clp, const char *name)
350 {
351 prop_changenode_t *cn;
352
353 for (cn = uu_list_first(clp->cl_list); cn != NULL;
354 cn = uu_list_next(clp->cl_list, cn)) {
355
356 if (strcmp(cn->cn_handle->zfs_name, name) == 0) {
357 uu_list_remove(clp->cl_list, cn);
358 zfs_close(cn->cn_handle);
359 free(cn);
360 return;
361 }
362 }
363 }
364
365 /*
366 * Release any memory associated with a changelist.
367 */
368 void
369 changelist_free(prop_changelist_t *clp)
370 {
371 prop_changenode_t *cn;
372 void *cookie;
373
374 if (clp->cl_list) {
375 cookie = NULL;
376 while ((cn = uu_list_teardown(clp->cl_list, &cookie)) != NULL) {
377 zfs_close(cn->cn_handle);
378 free(cn);
379 }
380
381 uu_list_destroy(clp->cl_list);
382 }
383 if (clp->cl_pool)
384 uu_list_pool_destroy(clp->cl_pool);
385
386 free(clp);
387 }
388
389 static int
390 change_one(zfs_handle_t *zhp, void *data)
391 {
392 prop_changelist_t *clp = data;
393 char property[ZFS_MAXPROPLEN];
394 char where[64];
395 prop_changenode_t *cn;
396 zprop_source_t sourcetype;
397 zprop_source_t share_sourcetype;
398
399 /*
400 * We only want to unmount/unshare those filesystems that may inherit
401 * from the target filesystem. If we find any filesystem with a
402 * locally set mountpoint, we ignore any children since changing the
403 * property will not affect them. If this is a rename, we iterate
404 * over all children regardless, since we need them unmounted in
405 * order to do the rename. Also, if this is a volume and we're doing
406 * a rename, then always add it to the changelist.
407 */
408
409 if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) &&
410 zfs_prop_get(zhp, clp->cl_prop, property,
411 sizeof (property), &sourcetype, where, sizeof (where),
412 B_FALSE) != 0) {
413 zfs_close(zhp);
414 return (0);
415 }
416
417 /*
418 * If we are "watching" sharenfs or sharesmb
419 * then check out the companion property which is tracked
420 * in cl_shareprop
421 */
422 if (clp->cl_shareprop != ZPROP_INVAL &&
423 zfs_prop_get(zhp, clp->cl_shareprop, property,
424 sizeof (property), &share_sourcetype, where, sizeof (where),
425 B_FALSE) != 0) {
426 zfs_close(zhp);
427 return (0);
428 }
429
430 if (clp->cl_alldependents || clp->cl_allchildren ||
431 sourcetype == ZPROP_SRC_DEFAULT ||
432 sourcetype == ZPROP_SRC_INHERITED ||
433 (clp->cl_shareprop != ZPROP_INVAL &&
434 (share_sourcetype == ZPROP_SRC_DEFAULT ||
435 share_sourcetype == ZPROP_SRC_INHERITED))) {
436 if ((cn = zfs_alloc(zfs_get_handle(zhp),
437 sizeof (prop_changenode_t))) == NULL) {
438 zfs_close(zhp);
439 return (-1);
440 }
441
442 cn->cn_handle = zhp;
443 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
444 zfs_is_mounted(zhp, NULL);
445 cn->cn_shared = zfs_is_shared(zhp);
446 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
447 cn->cn_needpost = B_TRUE;
448
449 /* Indicate if any child is exported to a local zone. */
450 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
451 clp->cl_haszonedchild = B_TRUE;
452
453 uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
454
455 if (clp->cl_sorted) {
456 uu_list_index_t idx;
457
458 (void) uu_list_find(clp->cl_list, cn, NULL,
459 &idx);
460 uu_list_insert(clp->cl_list, cn, idx);
461 } else {
462 /*
463 * Add this child to beginning of the list. Children
464 * below this one in the hierarchy will get added above
465 * this one in the list. This produces a list in
466 * reverse dataset name order.
467 * This is necessary when the original mountpoint
468 * is legacy or none.
469 */
470 ASSERT(!clp->cl_alldependents);
471 verify(uu_list_insert_before(clp->cl_list,
472 uu_list_first(clp->cl_list), cn) == 0);
473 }
474
475 if (!clp->cl_alldependents)
476 return (zfs_iter_children(zhp, change_one, data));
477 } else {
478 zfs_close(zhp);
479 }
480
481 return (0);
482 }
483
484 /*ARGSUSED*/
485 static int
486 compare_mountpoints(const void *a, const void *b, void *unused)
487 {
488 const prop_changenode_t *ca = a;
489 const prop_changenode_t *cb = b;
490
491 char mounta[MAXPATHLEN];
492 char mountb[MAXPATHLEN];
493
494 boolean_t hasmounta, hasmountb;
495
496 /*
497 * When unsharing or unmounting filesystems, we need to do it in
498 * mountpoint order. This allows the user to have a mountpoint
499 * hierarchy that is different from the dataset hierarchy, and still
500 * allow it to be changed. However, if either dataset doesn't have a
501 * mountpoint (because it is a volume or a snapshot), we place it at the
502 * end of the list, because it doesn't affect our change at all.
503 */
504 hasmounta = (zfs_prop_get(ca->cn_handle, ZFS_PROP_MOUNTPOINT, mounta,
505 sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
506 hasmountb = (zfs_prop_get(cb->cn_handle, ZFS_PROP_MOUNTPOINT, mountb,
507 sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
508
509 if (!hasmounta && hasmountb)
510 return (-1);
511 else if (hasmounta && !hasmountb)
512 return (1);
513 else if (!hasmounta && !hasmountb)
514 return (0);
515 else
516 return (strcmp(mountb, mounta));
517 }
518
519 /*
520 * Given a ZFS handle and a property, construct a complete list of datasets
521 * that need to be modified as part of this process. For anything but the
522 * 'mountpoint' and 'sharenfs' properties, this just returns an empty list.
523 * Otherwise, we iterate over all children and look for any datasets that
524 * inherit the property. For each such dataset, we add it to the list and
525 * mark whether it was shared beforehand.
526 */
527 prop_changelist_t *
528 changelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int gather_flags,
529 int mnt_flags)
530 {
531 prop_changelist_t *clp;
532 prop_changenode_t *cn;
533 zfs_handle_t *temp;
534 char property[ZFS_MAXPROPLEN];
535 uu_compare_fn_t *compare = NULL;
536 boolean_t legacy = B_FALSE;
537
538 if ((clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t))) == NULL)
539 return (NULL);
540
541 /*
542 * For mountpoint-related tasks, we want to sort everything by
543 * mountpoint, so that we mount and unmount them in the appropriate
544 * order, regardless of their position in the hierarchy.
545 */
546 if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED ||
547 prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS ||
548 prop == ZFS_PROP_SHARESMB) {
549
550 if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
551 property, sizeof (property),
552 NULL, NULL, 0, B_FALSE) == 0 &&
553 (strcmp(property, "legacy") == 0 ||
554 strcmp(property, "none") == 0)) {
555
556 legacy = B_TRUE;
557 }
558 if (!legacy) {
559 compare = compare_mountpoints;
560 clp->cl_sorted = B_TRUE;
561 }
562 }
563
564 clp->cl_pool = uu_list_pool_create("changelist_pool",
565 sizeof (prop_changenode_t),
566 offsetof(prop_changenode_t, cn_listnode),
567 compare, 0);
568 if (clp->cl_pool == NULL) {
569 assert(uu_error() == UU_ERROR_NO_MEMORY);
570 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
571 changelist_free(clp);
572 return (NULL);
573 }
574
575 clp->cl_list = uu_list_create(clp->cl_pool, NULL,
576 clp->cl_sorted ? UU_LIST_SORTED : 0);
577 clp->cl_gflags = gather_flags;
578 clp->cl_mflags = mnt_flags;
579
580 if (clp->cl_list == NULL) {
581 assert(uu_error() == UU_ERROR_NO_MEMORY);
582 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
583 changelist_free(clp);
584 return (NULL);
585 }
586
587 /*
588 * If this is a rename or the 'zoned' property, we pretend we're
589 * changing the mountpoint and flag it so we can catch all children in
590 * change_one().
591 *
592 * Flag cl_alldependents to catch all children plus the dependents
593 * (clones) that are not in the hierarchy.
594 */
595 if (prop == ZFS_PROP_NAME) {
596 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
597 clp->cl_alldependents = B_TRUE;
598 } else if (prop == ZFS_PROP_ZONED) {
599 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
600 clp->cl_allchildren = B_TRUE;
601 } else if (prop == ZFS_PROP_CANMOUNT) {
602 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
603 } else if (prop == ZFS_PROP_VOLSIZE) {
604 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
605 } else if (prop == ZFS_PROP_FSID_GUID) {
606 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
607 } else {
608 clp->cl_prop = prop;
609 }
610 clp->cl_realprop = prop;
611
612 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
613 clp->cl_prop != ZFS_PROP_SHARENFS &&
614 clp->cl_prop != ZFS_PROP_SHARESMB)
615 return (clp);
616
617 /*
618 * If watching SHARENFS or SHARESMB then
619 * also watch its companion property.
620 */
621 if (clp->cl_prop == ZFS_PROP_SHARENFS)
622 clp->cl_shareprop = ZFS_PROP_SHARESMB;
623 else if (clp->cl_prop == ZFS_PROP_SHARESMB)
624 clp->cl_shareprop = ZFS_PROP_SHARENFS;
625
626 if (clp->cl_alldependents) {
627 if (zfs_iter_dependents(zhp, B_TRUE, change_one, clp) != 0) {
628 changelist_free(clp);
629 return (NULL);
630 }
631 } else if (zfs_iter_children(zhp, change_one, clp) != 0) {
632 changelist_free(clp);
633 return (NULL);
634 }
635
636 /*
637 * We have to re-open ourselves because we auto-close all the handles
638 * and can't tell the difference.
639 */
640 if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp),
641 ZFS_TYPE_DATASET)) == NULL) {
642 changelist_free(clp);
643 return (NULL);
644 }
645
646 /*
647 * Always add ourself to the list. We add ourselves to the end so that
648 * we're the last to be unmounted.
649 */
650 if ((cn = zfs_alloc(zhp->zfs_hdl,
651 sizeof (prop_changenode_t))) == NULL) {
652 zfs_close(temp);
653 changelist_free(clp);
654 return (NULL);
655 }
656
657 cn->cn_handle = temp;
658 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
659 zfs_is_mounted(temp, NULL);
660 cn->cn_shared = zfs_is_shared(temp);
661 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
662 cn->cn_needpost = B_TRUE;
663
664 uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
665 if (clp->cl_sorted) {
666 uu_list_index_t idx;
667 (void) uu_list_find(clp->cl_list, cn, NULL, &idx);
668 uu_list_insert(clp->cl_list, cn, idx);
669 } else {
670 /*
671 * Add the target dataset to the end of the list.
672 * The list is not really unsorted. The list will be
673 * in reverse dataset name order. This is necessary
674 * when the original mountpoint is legacy or none.
675 */
676 verify(uu_list_insert_after(clp->cl_list,
677 uu_list_last(clp->cl_list), cn) == 0);
678 }
679
680 /*
681 * If the mountpoint property was previously 'legacy', or 'none',
682 * record it as the behavior of changelist_postfix() will be different.
683 */
684 if ((clp->cl_prop == ZFS_PROP_MOUNTPOINT) && legacy) {
685 /*
686 * do not automatically mount ex-legacy datasets if
687 * we specifically set canmount to noauto
688 */
689 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) !=
690 ZFS_CANMOUNT_NOAUTO)
691 clp->cl_waslegacy = B_TRUE;
692 }
693
694 return (clp);
695 }