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