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) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>.
28 * All rights reserved.
29 * Copyright (c) 2014, 2016 by Delphix. All rights reserved.
30 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
31 */
32
33 #include <libintl.h>
34 #include <libuutil.h>
35 #include <stddef.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unistd.h>
39 #include <zone.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 uu_list_node_t cn_listnode;
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 uu_list_pool_t *cl_pool;
81 uu_list_t *cl_list;
82 boolean_t cl_waslegacy;
83 boolean_t cl_allchildren;
84 boolean_t cl_alldependents;
85 int cl_mflags; /* Mount flags */
86 int cl_gflags; /* Gather request flags */
87 boolean_t cl_haszonedchild;
88 boolean_t cl_sorted;
89 };
90
91 /*
92 * If the property is 'mountpoint', go through and unmount filesystems as
93 * necessary. We don't do the same for 'sharenfs', because we can just re-share
94 * with different options without interrupting service. We do handle 'sharesmb'
95 * since there may be old resource names that need to be removed.
96 */
97 int
changelist_prefix(prop_changelist_t * clp)98 changelist_prefix(prop_changelist_t *clp)
99 {
100 prop_changenode_t *cn;
101 int ret = 0;
102
103 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
104 clp->cl_prop != ZFS_PROP_SHARESMB)
105 return (0);
106
107 for (cn = uu_list_first(clp->cl_list); cn != NULL;
108 cn = uu_list_next(clp->cl_list, cn)) {
109
110 /* if a previous loop failed, set the remaining to false */
111 if (ret == -1) {
112 cn->cn_needpost = B_FALSE;
113 continue;
114 }
115
116 /*
117 * If we are in the global zone, but this dataset is exported
118 * to a local zone, do nothing.
119 */
120 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
121 continue;
122
123 if (!ZFS_IS_VOLUME(cn->cn_handle)) {
124 /*
125 * Do the property specific processing.
126 */
127 switch (clp->cl_prop) {
128 case ZFS_PROP_MOUNTPOINT:
129 if (clp->cl_gflags & CL_GATHER_DONT_UNMOUNT)
130 break;
131 if (zfs_unmount(cn->cn_handle, NULL,
132 clp->cl_mflags) != 0) {
133 ret = -1;
134 cn->cn_needpost = B_FALSE;
135 }
136 break;
137 case ZFS_PROP_SHARESMB:
138 (void) zfs_unshare_smb(cn->cn_handle, NULL);
139 break;
140
141 default:
142 break;
143 }
144 }
145 }
146
147 if (ret == -1)
148 (void) changelist_postfix(clp);
149
150 return (ret);
151 }
152
153 /*
154 * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or
155 * reshare the filesystems as necessary. In changelist_gather() we recorded
156 * whether the filesystem was previously shared or mounted. The action we take
157 * depends on the previous state, and whether the value was previously 'legacy'.
158 * For non-legacy properties, we only remount/reshare the filesystem if it was
159 * previously mounted/shared. Otherwise, we always remount/reshare the
160 * filesystem.
161 */
162 int
changelist_postfix(prop_changelist_t * clp)163 changelist_postfix(prop_changelist_t *clp)
164 {
165 prop_changenode_t *cn;
166 char shareopts[ZFS_MAXPROPLEN];
167 int errors = 0;
168 libzfs_handle_t *hdl;
169 #ifdef illumos
170 size_t num_datasets = 0, i;
171 zfs_handle_t **zhandle_arr;
172 sa_init_selective_arg_t sharearg;
173 #endif
174
175 /*
176 * If we're changing the mountpoint, attempt to destroy the underlying
177 * mountpoint. All other datasets will have inherited from this dataset
178 * (in which case their mountpoints exist in the filesystem in the new
179 * location), or have explicit mountpoints set (in which case they won't
180 * be in the changelist).
181 */
182 if ((cn = uu_list_last(clp->cl_list)) == NULL)
183 return (0);
184
185 if (clp->cl_prop == ZFS_PROP_MOUNTPOINT &&
186 !(clp->cl_gflags & CL_GATHER_DONT_UNMOUNT)) {
187 remove_mountpoint(cn->cn_handle);
188 }
189
190 /*
191 * It is possible that the changelist_prefix() used libshare
192 * to unshare some entries. Since libshare caches data, an
193 * attempt to reshare during postfix can fail unless libshare
194 * is uninitialized here so that it will reinitialize later.
195 */
196 if (cn->cn_handle != NULL) {
197 hdl = cn->cn_handle->zfs_hdl;
198 assert(hdl != NULL);
199 zfs_uninit_libshare(hdl);
200
201 #ifdef illumos
202 /*
203 * For efficiencies sake, we initialize libshare for only a few
204 * shares (the ones affected here). Future initializations in
205 * this process should just use the cached initialization.
206 */
207 for (cn = uu_list_last(clp->cl_list); cn != NULL;
208 cn = uu_list_prev(clp->cl_list, cn)) {
209 num_datasets++;
210 }
211
212 zhandle_arr = zfs_alloc(hdl,
213 num_datasets * sizeof (zfs_handle_t *));
214 for (i = 0, cn = uu_list_last(clp->cl_list); cn != NULL;
215 cn = uu_list_prev(clp->cl_list, cn)) {
216 zhandle_arr[i++] = cn->cn_handle;
217 zfs_refresh_properties(cn->cn_handle);
218 }
219 assert(i == num_datasets);
220 sharearg.zhandle_arr = zhandle_arr;
221 sharearg.zhandle_len = num_datasets;
222 errors = zfs_init_libshare_arg(hdl, SA_INIT_SHARE_API_SELECTIVE,
223 &sharearg);
224 free(zhandle_arr);
225 #endif
226 }
227 /*
228 * We walk the datasets in reverse, because we want to mount any parent
229 * datasets before mounting the children. We walk all datasets even if
230 * there are errors.
231 */
232 for (cn = uu_list_last(clp->cl_list); cn != NULL;
233 cn = uu_list_prev(clp->cl_list, cn)) {
234
235 boolean_t sharenfs;
236 boolean_t sharesmb;
237 boolean_t mounted;
238
239 /*
240 * If we are in the global zone, but this dataset is exported
241 * to a local zone, do nothing.
242 */
243 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
244 continue;
245
246 /* Only do post-processing if it's required */
247 if (!cn->cn_needpost)
248 continue;
249 cn->cn_needpost = B_FALSE;
250
251 #ifndef illumos
252 zfs_refresh_properties(cn->cn_handle);
253 #endif
254
255 if (ZFS_IS_VOLUME(cn->cn_handle))
256 continue;
257
258 /*
259 * Remount if previously mounted or mountpoint was legacy,
260 * or sharenfs or sharesmb property is set.
261 */
262 sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS,
263 shareopts, sizeof (shareopts), NULL, NULL, 0,
264 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
265
266 sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB,
267 shareopts, sizeof (shareopts), NULL, NULL, 0,
268 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
269
270 mounted = (clp->cl_gflags & CL_GATHER_DONT_UNMOUNT) ||
271 zfs_is_mounted(cn->cn_handle, NULL);
272
273 if (!mounted && (cn->cn_mounted ||
274 ((sharenfs || sharesmb || clp->cl_waslegacy) &&
275 (zfs_prop_get_int(cn->cn_handle,
276 ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON)))) {
277
278 if (zfs_mount(cn->cn_handle, NULL, 0) != 0)
279 errors++;
280 else
281 mounted = TRUE;
282 }
283
284 /*
285 * If the file system is mounted we always re-share even
286 * if the filesystem is currently shared, so that we can
287 * adopt any new options.
288 */
289 if (sharenfs && mounted)
290 errors += zfs_share_nfs(cn->cn_handle);
291 else if (cn->cn_shared || clp->cl_waslegacy)
292 errors += zfs_unshare_nfs(cn->cn_handle, NULL);
293 if (sharesmb && mounted)
294 errors += zfs_share_smb(cn->cn_handle);
295 else if (cn->cn_shared || clp->cl_waslegacy)
296 errors += zfs_unshare_smb(cn->cn_handle, NULL);
297 }
298
299 return (errors ? -1 : 0);
300 }
301
302 /*
303 * Is this "dataset" a child of "parent"?
304 */
305 boolean_t
isa_child_of(const char * dataset,const char * parent)306 isa_child_of(const char *dataset, const char *parent)
307 {
308 int len;
309
310 len = strlen(parent);
311
312 if (strncmp(dataset, parent, len) == 0 &&
313 (dataset[len] == '@' || dataset[len] == '/' ||
314 dataset[len] == '\0'))
315 return (B_TRUE);
316 else
317 return (B_FALSE);
318
319 }
320
321 /*
322 * If we rename a filesystem, child filesystem handles are no longer valid
323 * since we identify each dataset by its name in the ZFS namespace. As a
324 * result, we have to go through and fix up all the names appropriately. We
325 * could do this automatically if libzfs kept track of all open handles, but
326 * this is a lot less work.
327 */
328 void
changelist_rename(prop_changelist_t * clp,const char * src,const char * dst)329 changelist_rename(prop_changelist_t *clp, const char *src, const char *dst)
330 {
331 prop_changenode_t *cn;
332 char newname[ZFS_MAX_DATASET_NAME_LEN];
333
334 for (cn = uu_list_first(clp->cl_list); cn != NULL;
335 cn = uu_list_next(clp->cl_list, cn)) {
336 /*
337 * Do not rename a clone that's not in the source hierarchy.
338 */
339 if (!isa_child_of(cn->cn_handle->zfs_name, src))
340 continue;
341
342 /*
343 * Destroy the previous mountpoint if needed.
344 */
345 remove_mountpoint(cn->cn_handle);
346
347 (void) strlcpy(newname, dst, sizeof (newname));
348 (void) strcat(newname, cn->cn_handle->zfs_name + strlen(src));
349
350 (void) strlcpy(cn->cn_handle->zfs_name, newname,
351 sizeof (cn->cn_handle->zfs_name));
352 }
353 }
354
355 /*
356 * Given a gathered changelist for the 'sharenfs' or 'sharesmb' property,
357 * unshare all the datasets in the list.
358 */
359 int
changelist_unshare(prop_changelist_t * clp,zfs_share_proto_t * proto)360 changelist_unshare(prop_changelist_t *clp, zfs_share_proto_t *proto)
361 {
362 prop_changenode_t *cn;
363 int ret = 0;
364
365 if (clp->cl_prop != ZFS_PROP_SHARENFS &&
366 clp->cl_prop != ZFS_PROP_SHARESMB)
367 return (0);
368
369 for (cn = uu_list_first(clp->cl_list); cn != NULL;
370 cn = uu_list_next(clp->cl_list, cn)) {
371 if (zfs_unshare_proto(cn->cn_handle, NULL, proto) != 0)
372 ret = -1;
373 }
374
375 return (ret);
376 }
377
378 /*
379 * Check if there is any child exported to a local zone in a given changelist.
380 * This information has already been recorded while gathering the changelist
381 * via changelist_gather().
382 */
383 int
changelist_haszonedchild(prop_changelist_t * clp)384 changelist_haszonedchild(prop_changelist_t *clp)
385 {
386 return (clp->cl_haszonedchild);
387 }
388
389 /*
390 * Remove a node from a gathered list.
391 */
392 void
changelist_remove(prop_changelist_t * clp,const char * name)393 changelist_remove(prop_changelist_t *clp, const char *name)
394 {
395 prop_changenode_t *cn;
396
397 for (cn = uu_list_first(clp->cl_list); cn != NULL;
398 cn = uu_list_next(clp->cl_list, cn)) {
399
400 if (strcmp(cn->cn_handle->zfs_name, name) == 0) {
401 uu_list_remove(clp->cl_list, cn);
402 zfs_close(cn->cn_handle);
403 free(cn);
404 return;
405 }
406 }
407 }
408
409 /*
410 * Release any memory associated with a changelist.
411 */
412 void
changelist_free(prop_changelist_t * clp)413 changelist_free(prop_changelist_t *clp)
414 {
415 prop_changenode_t *cn;
416 void *cookie;
417
418 if (clp->cl_list) {
419 cookie = NULL;
420 while ((cn = uu_list_teardown(clp->cl_list, &cookie)) != NULL) {
421 zfs_close(cn->cn_handle);
422 free(cn);
423 }
424
425 uu_list_destroy(clp->cl_list);
426 }
427 if (clp->cl_pool)
428 uu_list_pool_destroy(clp->cl_pool);
429
430 free(clp);
431 }
432
433 static int
change_one(zfs_handle_t * zhp,void * data)434 change_one(zfs_handle_t *zhp, void *data)
435 {
436 prop_changelist_t *clp = data;
437 char property[ZFS_MAXPROPLEN];
438 char where[64];
439 prop_changenode_t *cn;
440 zprop_source_t sourcetype;
441 zprop_source_t share_sourcetype;
442
443 /*
444 * We only want to unmount/unshare those filesystems that may inherit
445 * from the target filesystem. If we find any filesystem with a
446 * locally set mountpoint, we ignore any children since changing the
447 * property will not affect them. If this is a rename, we iterate
448 * over all children regardless, since we need them unmounted in
449 * order to do the rename. Also, if this is a volume and we're doing
450 * a rename, then always add it to the changelist.
451 */
452
453 if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) &&
454 zfs_prop_get(zhp, clp->cl_prop, property,
455 sizeof (property), &sourcetype, where, sizeof (where),
456 B_FALSE) != 0) {
457 zfs_close(zhp);
458 return (0);
459 }
460
461 /*
462 * If we are "watching" sharenfs or sharesmb
463 * then check out the companion property which is tracked
464 * in cl_shareprop
465 */
466 if (clp->cl_shareprop != ZPROP_INVAL &&
467 zfs_prop_get(zhp, clp->cl_shareprop, property,
468 sizeof (property), &share_sourcetype, where, sizeof (where),
469 B_FALSE) != 0) {
470 zfs_close(zhp);
471 return (0);
472 }
473
474 if (clp->cl_alldependents || clp->cl_allchildren ||
475 sourcetype == ZPROP_SRC_DEFAULT ||
476 sourcetype == ZPROP_SRC_INHERITED ||
477 (clp->cl_shareprop != ZPROP_INVAL &&
478 (share_sourcetype == ZPROP_SRC_DEFAULT ||
479 share_sourcetype == ZPROP_SRC_INHERITED))) {
480 if ((cn = zfs_alloc(zfs_get_handle(zhp),
481 sizeof (prop_changenode_t))) == NULL) {
482 zfs_close(zhp);
483 return (-1);
484 }
485
486 cn->cn_handle = zhp;
487 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
488 zfs_is_mounted(zhp, NULL);
489 cn->cn_shared = zfs_is_shared(zhp);
490 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
491 cn->cn_needpost = B_TRUE;
492
493 /* Indicate if any child is exported to a local zone. */
494 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
495 clp->cl_haszonedchild = B_TRUE;
496
497 uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
498
499 if (clp->cl_sorted) {
500 uu_list_index_t idx;
501
502 (void) uu_list_find(clp->cl_list, cn, NULL,
503 &idx);
504 uu_list_insert(clp->cl_list, cn, idx);
505 } else {
506 /*
507 * Add this child to beginning of the list. Children
508 * below this one in the hierarchy will get added above
509 * this one in the list. This produces a list in
510 * reverse dataset name order.
511 * This is necessary when the original mountpoint
512 * is legacy or none.
513 */
514 verify(uu_list_insert_before(clp->cl_list,
515 uu_list_first(clp->cl_list), cn) == 0);
516 }
517
518 if (!clp->cl_alldependents)
519 return (zfs_iter_children(zhp, change_one, data));
520 } else {
521 zfs_close(zhp);
522 }
523
524 return (0);
525 }
526
527 /*ARGSUSED*/
528 static int
compare_mountpoints(const void * a,const void * b,void * unused)529 compare_mountpoints(const void *a, const void *b, void *unused)
530 {
531 const prop_changenode_t *ca = a;
532 const prop_changenode_t *cb = b;
533
534 char mounta[MAXPATHLEN];
535 char mountb[MAXPATHLEN];
536
537 boolean_t hasmounta, hasmountb;
538
539 /*
540 * When unsharing or unmounting filesystems, we need to do it in
541 * mountpoint order. This allows the user to have a mountpoint
542 * hierarchy that is different from the dataset hierarchy, and still
543 * allow it to be changed. However, if either dataset doesn't have a
544 * mountpoint (because it is a volume or a snapshot), we place it at the
545 * end of the list, because it doesn't affect our change at all.
546 */
547 hasmounta = (zfs_prop_get(ca->cn_handle, ZFS_PROP_MOUNTPOINT, mounta,
548 sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
549 hasmountb = (zfs_prop_get(cb->cn_handle, ZFS_PROP_MOUNTPOINT, mountb,
550 sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
551
552 if (!hasmounta && hasmountb)
553 return (-1);
554 else if (hasmounta && !hasmountb)
555 return (1);
556 else if (!hasmounta && !hasmountb)
557 return (0);
558 else
559 return (strcmp(mountb, mounta));
560 }
561
562 /*
563 * Given a ZFS handle and a property, construct a complete list of datasets
564 * that need to be modified as part of this process. For anything but the
565 * 'mountpoint' and 'sharenfs' properties, this just returns an empty list.
566 * Otherwise, we iterate over all children and look for any datasets that
567 * inherit the property. For each such dataset, we add it to the list and
568 * mark whether it was shared beforehand.
569 */
570 prop_changelist_t *
changelist_gather(zfs_handle_t * zhp,zfs_prop_t prop,int gather_flags,int mnt_flags)571 changelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int gather_flags,
572 int mnt_flags)
573 {
574 prop_changelist_t *clp;
575 prop_changenode_t *cn;
576 zfs_handle_t *temp;
577 char property[ZFS_MAXPROPLEN];
578 uu_compare_fn_t *compare = NULL;
579 boolean_t legacy = B_FALSE;
580
581 if ((clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t))) == NULL)
582 return (NULL);
583
584 /*
585 * For mountpoint-related tasks, we want to sort everything by
586 * mountpoint, so that we mount and unmount them in the appropriate
587 * order, regardless of their position in the hierarchy.
588 */
589 if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED ||
590 prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS ||
591 prop == ZFS_PROP_SHARESMB) {
592
593 if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
594 property, sizeof (property),
595 NULL, NULL, 0, B_FALSE) == 0 &&
596 (strcmp(property, "legacy") == 0 ||
597 strcmp(property, "none") == 0)) {
598
599 legacy = B_TRUE;
600 }
601 if (!legacy) {
602 compare = compare_mountpoints;
603 clp->cl_sorted = B_TRUE;
604 }
605 }
606
607 clp->cl_pool = uu_list_pool_create("changelist_pool",
608 sizeof (prop_changenode_t),
609 offsetof(prop_changenode_t, cn_listnode),
610 compare, 0);
611 if (clp->cl_pool == 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 clp->cl_list = uu_list_create(clp->cl_pool, NULL,
619 clp->cl_sorted ? UU_LIST_SORTED : 0);
620 clp->cl_gflags = gather_flags;
621 clp->cl_mflags = mnt_flags;
622
623 if (clp->cl_list == NULL) {
624 assert(uu_error() == UU_ERROR_NO_MEMORY);
625 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
626 changelist_free(clp);
627 return (NULL);
628 }
629
630 /*
631 * If this is a rename or the 'zoned' property, we pretend we're
632 * changing the mountpoint and flag it so we can catch all children in
633 * change_one().
634 *
635 * Flag cl_alldependents to catch all children plus the dependents
636 * (clones) that are not in the hierarchy.
637 */
638 if (prop == ZFS_PROP_NAME) {
639 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
640 clp->cl_alldependents = B_TRUE;
641 } else if (prop == ZFS_PROP_ZONED) {
642 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
643 clp->cl_allchildren = B_TRUE;
644 } else if (prop == ZFS_PROP_CANMOUNT) {
645 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
646 } else if (prop == ZFS_PROP_VOLSIZE) {
647 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
648 } else {
649 clp->cl_prop = prop;
650 }
651 clp->cl_realprop = prop;
652
653 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
654 clp->cl_prop != ZFS_PROP_SHARENFS &&
655 clp->cl_prop != ZFS_PROP_SHARESMB)
656 return (clp);
657
658 /*
659 * If watching SHARENFS or SHARESMB then
660 * also watch its companion property.
661 */
662 if (clp->cl_prop == ZFS_PROP_SHARENFS)
663 clp->cl_shareprop = ZFS_PROP_SHARESMB;
664 else if (clp->cl_prop == ZFS_PROP_SHARESMB)
665 clp->cl_shareprop = ZFS_PROP_SHARENFS;
666
667 if (clp->cl_alldependents) {
668 if (zfs_iter_dependents(zhp, B_TRUE, change_one, clp) != 0) {
669 changelist_free(clp);
670 return (NULL);
671 }
672 } else if (zfs_iter_children(zhp, change_one, clp) != 0) {
673 changelist_free(clp);
674 return (NULL);
675 }
676
677 /*
678 * We have to re-open ourselves because we auto-close all the handles
679 * and can't tell the difference.
680 */
681 if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp),
682 ZFS_TYPE_DATASET)) == NULL) {
683 changelist_free(clp);
684 return (NULL);
685 }
686
687 /*
688 * Always add ourself to the list. We add ourselves to the end so that
689 * we're the last to be unmounted.
690 */
691 if ((cn = zfs_alloc(zhp->zfs_hdl,
692 sizeof (prop_changenode_t))) == NULL) {
693 zfs_close(temp);
694 changelist_free(clp);
695 return (NULL);
696 }
697
698 cn->cn_handle = temp;
699 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
700 zfs_is_mounted(temp, NULL);
701 cn->cn_shared = zfs_is_shared(temp);
702 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
703 cn->cn_needpost = B_TRUE;
704
705 uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
706 if (clp->cl_sorted) {
707 uu_list_index_t idx;
708 (void) uu_list_find(clp->cl_list, cn, NULL, &idx);
709 uu_list_insert(clp->cl_list, cn, idx);
710 } else {
711 /*
712 * Add the target dataset to the end of the list.
713 * The list is not really unsorted. The list will be
714 * in reverse dataset name order. This is necessary
715 * when the original mountpoint is legacy or none.
716 */
717 verify(uu_list_insert_after(clp->cl_list,
718 uu_list_last(clp->cl_list), cn) == 0);
719 }
720
721 /*
722 * If the mountpoint property was previously 'legacy', or 'none',
723 * record it as the behavior of changelist_postfix() will be different.
724 */
725 if ((clp->cl_prop == ZFS_PROP_MOUNTPOINT) && legacy) {
726 /*
727 * do not automatically mount ex-legacy datasets if
728 * we specifically set canmount to noauto
729 */
730 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) !=
731 ZFS_CANMOUNT_NOAUTO)
732 clp->cl_waslegacy = B_TRUE;
733 }
734
735 return (clp);
736 }
737