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 https://opensource.org/licenses/CDDL-1.0.
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, 2020 by Delphix. All rights reserved.
28 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
29 * Copyright (c) 2018 Datto Inc.
30 */
31
32 #include <libintl.h>
33 #include <libuutil.h>
34 #include <stddef.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38 #include <zone.h>
39
40 #include <libzfs.h>
41
42 #include "libzfs_impl.h"
43
44 /*
45 * Structure to keep track of dataset state. Before changing the 'sharenfs' or
46 * 'mountpoint' property, we record whether the filesystem was previously
47 * mounted/shared. This prior state dictates whether we remount/reshare the
48 * dataset after the property has been changed.
49 *
50 * The interface consists of the following sequence of functions:
51 *
52 * changelist_gather()
53 * changelist_prefix()
54 * < change property >
55 * changelist_postfix()
56 * changelist_free()
57 *
58 * Other interfaces:
59 *
60 * changelist_remove() - remove a node from a gathered list
61 * changelist_rename() - renames all datasets appropriately when doing a rename
62 * changelist_unshare() - unshares all the nodes in a given changelist
63 * changelist_haszonedchild() - check if there is any child exported to
64 * a local zone
65 */
66 typedef struct prop_changenode {
67 zfs_handle_t *cn_handle;
68 int cn_shared;
69 int cn_mounted;
70 int cn_zoned;
71 boolean_t cn_needpost; /* is postfix() needed? */
72 uu_avl_node_t cn_treenode;
73 } prop_changenode_t;
74
75 struct prop_changelist {
76 zfs_prop_t cl_prop;
77 zfs_prop_t cl_realprop;
78 zfs_prop_t cl_shareprop; /* used with sharenfs/sharesmb */
79 uu_avl_pool_t *cl_pool;
80 uu_avl_t *cl_tree;
81 boolean_t cl_waslegacy;
82 boolean_t cl_allchildren;
83 boolean_t cl_alldependents;
84 int cl_mflags; /* Mount flags */
85 int cl_gflags; /* Gather request flags */
86 boolean_t cl_haszonedchild;
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 uu_avl_walk_t *walk;
100 int ret = 0;
101 const enum sa_protocol smb[] = {SA_PROTOCOL_SMB, SA_NO_PROTOCOL};
102 boolean_t commit_smb_shares = B_FALSE;
103
104 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
105 clp->cl_prop != ZFS_PROP_SHARESMB)
106 return (0);
107
108 /*
109 * If CL_GATHER_DONT_UNMOUNT is set, don't want to unmount/unshare and
110 * later (re)mount/(re)share the filesystem in postfix phase, so we
111 * return from here. If filesystem is mounted or unmounted, leave it
112 * as it is.
113 */
114 if (clp->cl_gflags & CL_GATHER_DONT_UNMOUNT)
115 return (0);
116
117 if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL)
118 return (-1);
119
120 while ((cn = uu_avl_walk_next(walk)) != NULL) {
121
122 /* if a previous loop failed, set the remaining to false */
123 if (ret == -1) {
124 cn->cn_needpost = B_FALSE;
125 continue;
126 }
127
128 /*
129 * If we are in the global zone, but this dataset is exported
130 * to a local zone, do nothing.
131 */
132 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
133 continue;
134
135 if (!ZFS_IS_VOLUME(cn->cn_handle)) {
136 /*
137 * Do the property specific processing.
138 */
139 switch (clp->cl_prop) {
140 case ZFS_PROP_MOUNTPOINT:
141 if (zfs_unmount(cn->cn_handle, NULL,
142 clp->cl_mflags) != 0) {
143 ret = -1;
144 cn->cn_needpost = B_FALSE;
145 }
146 break;
147 case ZFS_PROP_SHARESMB:
148 (void) zfs_unshare(cn->cn_handle, NULL,
149 smb);
150 commit_smb_shares = B_TRUE;
151 break;
152
153 default:
154 break;
155 }
156 }
157 }
158
159 if (commit_smb_shares)
160 zfs_commit_shares(smb);
161 uu_avl_walk_end(walk);
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 always remount/reshare the filesystem,
175 * if CL_GATHER_DONT_UNMOUNT is not set.
176 */
177 int
changelist_postfix(prop_changelist_t * clp)178 changelist_postfix(prop_changelist_t *clp)
179 {
180 prop_changenode_t *cn;
181 uu_avl_walk_t *walk;
182 char shareopts[ZFS_MAXPROPLEN];
183 boolean_t commit_smb_shares = B_FALSE;
184 boolean_t commit_nfs_shares = B_FALSE;
185
186 /*
187 * If CL_GATHER_DONT_UNMOUNT is set, it means we don't want to (un)mount
188 * or (re/un)share the filesystem, so we return from here. If filesystem
189 * is mounted or unmounted, leave it as it is.
190 */
191 if (clp->cl_gflags & CL_GATHER_DONT_UNMOUNT)
192 return (0);
193
194 /*
195 * If we're changing the mountpoint, attempt to destroy the underlying
196 * mountpoint. All other datasets will have inherited from this dataset
197 * (in which case their mountpoints exist in the filesystem in the new
198 * location), or have explicit mountpoints set (in which case they won't
199 * be in the changelist).
200 */
201 if ((cn = uu_avl_last(clp->cl_tree)) == NULL)
202 return (0);
203
204 if (clp->cl_prop == ZFS_PROP_MOUNTPOINT &&
205 !(clp->cl_gflags & CL_GATHER_DONT_UNMOUNT))
206 remove_mountpoint(cn->cn_handle);
207
208 /*
209 * We walk the datasets in reverse, because we want to mount any parent
210 * datasets before mounting the children. We walk all datasets even if
211 * there are errors.
212 */
213 if ((walk = uu_avl_walk_start(clp->cl_tree,
214 UU_WALK_REVERSE | UU_WALK_ROBUST)) == NULL)
215 return (-1);
216
217 while ((cn = uu_avl_walk_next(walk)) != NULL) {
218
219 boolean_t sharenfs;
220 boolean_t sharesmb;
221 boolean_t mounted;
222 boolean_t needs_key;
223
224 /*
225 * If we are in the global zone, but this dataset is exported
226 * to a local zone, do nothing.
227 */
228 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
229 continue;
230
231 /* Only do post-processing if it's required */
232 if (!cn->cn_needpost)
233 continue;
234 cn->cn_needpost = B_FALSE;
235
236 zfs_refresh_properties(cn->cn_handle);
237
238 if (ZFS_IS_VOLUME(cn->cn_handle))
239 continue;
240
241 /*
242 * Remount if previously mounted or mountpoint was legacy,
243 * or sharenfs or sharesmb property is set.
244 */
245 sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS,
246 shareopts, sizeof (shareopts), NULL, NULL, 0,
247 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
248
249 sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB,
250 shareopts, sizeof (shareopts), NULL, NULL, 0,
251 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
252
253 needs_key = (zfs_prop_get_int(cn->cn_handle,
254 ZFS_PROP_KEYSTATUS) == ZFS_KEYSTATUS_UNAVAILABLE);
255
256 mounted = zfs_is_mounted(cn->cn_handle, NULL);
257
258 if (!mounted && !needs_key && (cn->cn_mounted ||
259 (((clp->cl_prop == ZFS_PROP_MOUNTPOINT &&
260 clp->cl_prop == clp->cl_realprop) ||
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 mounted = TRUE;
267 }
268
269 /*
270 * If the file system is mounted we always re-share even
271 * if the filesystem is currently shared, so that we can
272 * adopt any new options.
273 */
274 const enum sa_protocol nfs[] =
275 {SA_PROTOCOL_NFS, SA_NO_PROTOCOL};
276 if (sharenfs && mounted) {
277 zfs_share(cn->cn_handle, nfs);
278 commit_nfs_shares = B_TRUE;
279 } else if (cn->cn_shared || clp->cl_waslegacy) {
280 zfs_unshare(cn->cn_handle, NULL, nfs);
281 commit_nfs_shares = B_TRUE;
282 }
283 const enum sa_protocol smb[] =
284 {SA_PROTOCOL_SMB, SA_NO_PROTOCOL};
285 if (sharesmb && mounted) {
286 zfs_share(cn->cn_handle, smb);
287 commit_smb_shares = B_TRUE;
288 } else if (cn->cn_shared || clp->cl_waslegacy) {
289 zfs_unshare(cn->cn_handle, NULL, smb);
290 commit_smb_shares = B_TRUE;
291 }
292 }
293
294 enum sa_protocol proto[SA_PROTOCOL_COUNT + 1], *p = proto;
295 if (commit_nfs_shares)
296 *p++ = SA_PROTOCOL_NFS;
297 if (commit_smb_shares)
298 *p++ = SA_PROTOCOL_SMB;
299 *p++ = SA_NO_PROTOCOL;
300 zfs_commit_shares(proto);
301 uu_avl_walk_end(walk);
302
303 return (0);
304 }
305
306 /*
307 * Is this "dataset" a child of "parent"?
308 */
309 static boolean_t
isa_child_of(const char * dataset,const char * parent)310 isa_child_of(const char *dataset, const char *parent)
311 {
312 int len;
313
314 len = strlen(parent);
315
316 if (strncmp(dataset, parent, len) == 0 &&
317 (dataset[len] == '@' || dataset[len] == '/' ||
318 dataset[len] == '\0'))
319 return (B_TRUE);
320 else
321 return (B_FALSE);
322
323 }
324
325 /*
326 * If we rename a filesystem, child filesystem handles are no longer valid
327 * since we identify each dataset by its name in the ZFS namespace. As a
328 * result, we have to go through and fix up all the names appropriately. We
329 * could do this automatically if libzfs kept track of all open handles, but
330 * this is a lot less work.
331 */
332 void
changelist_rename(prop_changelist_t * clp,const char * src,const char * dst)333 changelist_rename(prop_changelist_t *clp, const char *src, const char *dst)
334 {
335 prop_changenode_t *cn;
336 uu_avl_walk_t *walk;
337 char newname[ZFS_MAX_DATASET_NAME_LEN];
338
339 if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL)
340 return;
341
342 while ((cn = uu_avl_walk_next(walk)) != NULL) {
343 /*
344 * Do not rename a clone that's not in the source hierarchy.
345 */
346 if (!isa_child_of(cn->cn_handle->zfs_name, src))
347 continue;
348
349 /*
350 * Destroy the previous mountpoint if needed.
351 */
352 remove_mountpoint(cn->cn_handle);
353
354 (void) strlcpy(newname, dst, sizeof (newname));
355 (void) strlcat(newname, cn->cn_handle->zfs_name + strlen(src),
356 sizeof (newname));
357
358 (void) strlcpy(cn->cn_handle->zfs_name, newname,
359 sizeof (cn->cn_handle->zfs_name));
360 }
361
362 uu_avl_walk_end(walk);
363 }
364
365 /*
366 * Given a gathered changelist for the 'sharenfs' or 'sharesmb' property,
367 * unshare all the datasets in the list.
368 */
369 int
changelist_unshare(prop_changelist_t * clp,const enum sa_protocol * proto)370 changelist_unshare(prop_changelist_t *clp, const enum sa_protocol *proto)
371 {
372 prop_changenode_t *cn;
373 uu_avl_walk_t *walk;
374 int ret = 0;
375
376 if (clp->cl_prop != ZFS_PROP_SHARENFS &&
377 clp->cl_prop != ZFS_PROP_SHARESMB)
378 return (0);
379
380 if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL)
381 return (-1);
382
383 while ((cn = uu_avl_walk_next(walk)) != NULL) {
384 if (zfs_unshare(cn->cn_handle, NULL, proto) != 0)
385 ret = -1;
386 }
387
388 for (const enum sa_protocol *p = proto; *p != SA_NO_PROTOCOL; ++p)
389 sa_commit_shares(*p);
390 uu_avl_walk_end(walk);
391
392 return (ret);
393 }
394
395 /*
396 * Check if there is any child exported to a local zone in a given changelist.
397 * This information has already been recorded while gathering the changelist
398 * via changelist_gather().
399 */
400 int
changelist_haszonedchild(prop_changelist_t * clp)401 changelist_haszonedchild(prop_changelist_t *clp)
402 {
403 return (clp->cl_haszonedchild);
404 }
405
406 /*
407 * Remove a node from a gathered list.
408 */
409 void
changelist_remove(prop_changelist_t * clp,const char * name)410 changelist_remove(prop_changelist_t *clp, const char *name)
411 {
412 prop_changenode_t *cn;
413 uu_avl_walk_t *walk;
414
415 if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL)
416 return;
417
418 while ((cn = uu_avl_walk_next(walk)) != NULL) {
419 if (strcmp(cn->cn_handle->zfs_name, name) == 0) {
420 uu_avl_remove(clp->cl_tree, cn);
421 zfs_close(cn->cn_handle);
422 free(cn);
423 uu_avl_walk_end(walk);
424 return;
425 }
426 }
427
428 uu_avl_walk_end(walk);
429 }
430
431 /*
432 * Release any memory associated with a changelist.
433 */
434 void
changelist_free(prop_changelist_t * clp)435 changelist_free(prop_changelist_t *clp)
436 {
437 prop_changenode_t *cn;
438
439 if (clp->cl_tree) {
440 uu_avl_walk_t *walk;
441
442 if ((walk = uu_avl_walk_start(clp->cl_tree,
443 UU_WALK_ROBUST)) == NULL)
444 return;
445
446 while ((cn = uu_avl_walk_next(walk)) != NULL) {
447 uu_avl_remove(clp->cl_tree, cn);
448 zfs_close(cn->cn_handle);
449 free(cn);
450 }
451
452 uu_avl_walk_end(walk);
453 uu_avl_destroy(clp->cl_tree);
454 }
455 if (clp->cl_pool)
456 uu_avl_pool_destroy(clp->cl_pool);
457
458 free(clp);
459 }
460
461 /*
462 * Add one dataset to changelist
463 */
464 static int
changelist_add_mounted(zfs_handle_t * zhp,void * data)465 changelist_add_mounted(zfs_handle_t *zhp, void *data)
466 {
467 prop_changelist_t *clp = data;
468 prop_changenode_t *cn;
469 uu_avl_index_t idx;
470
471 ASSERT3U(clp->cl_prop, ==, ZFS_PROP_MOUNTPOINT);
472
473 cn = zfs_alloc(zfs_get_handle(zhp), sizeof (prop_changenode_t));
474 cn->cn_handle = zhp;
475 cn->cn_mounted = zfs_is_mounted(zhp, NULL);
476 ASSERT3U(cn->cn_mounted, ==, B_TRUE);
477 cn->cn_shared = zfs_is_shared(zhp, NULL, NULL);
478 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
479 cn->cn_needpost = B_TRUE;
480
481 /* Indicate if any child is exported to a local zone. */
482 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
483 clp->cl_haszonedchild = B_TRUE;
484
485 uu_avl_node_init(cn, &cn->cn_treenode, clp->cl_pool);
486
487 if (uu_avl_find(clp->cl_tree, cn, NULL, &idx) == NULL) {
488 uu_avl_insert(clp->cl_tree, cn, idx);
489 } else {
490 free(cn);
491 zfs_close(zhp);
492 }
493
494 return (0);
495 }
496
497 static int
change_one(zfs_handle_t * zhp,void * data)498 change_one(zfs_handle_t *zhp, void *data)
499 {
500 prop_changelist_t *clp = data;
501 char property[ZFS_MAXPROPLEN];
502 char where[64];
503 prop_changenode_t *cn = NULL;
504 zprop_source_t sourcetype = ZPROP_SRC_NONE;
505 zprop_source_t share_sourcetype = ZPROP_SRC_NONE;
506 int ret = 0;
507
508 /*
509 * We only want to unmount/unshare those filesystems that may inherit
510 * from the target filesystem. If we find any filesystem with a
511 * locally set mountpoint, we ignore any children since changing the
512 * property will not affect them. If this is a rename, we iterate
513 * over all children regardless, since we need them unmounted in
514 * order to do the rename. Also, if this is a volume and we're doing
515 * a rename, then always add it to the changelist.
516 */
517
518 if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) &&
519 zfs_prop_get(zhp, clp->cl_prop, property,
520 sizeof (property), &sourcetype, where, sizeof (where),
521 B_FALSE) != 0) {
522 goto out;
523 }
524
525 /*
526 * If we are "watching" sharenfs or sharesmb
527 * then check out the companion property which is tracked
528 * in cl_shareprop
529 */
530 if (clp->cl_shareprop != ZPROP_INVAL &&
531 zfs_prop_get(zhp, clp->cl_shareprop, property,
532 sizeof (property), &share_sourcetype, where, sizeof (where),
533 B_FALSE) != 0) {
534 goto out;
535 }
536
537 if (clp->cl_alldependents || clp->cl_allchildren ||
538 sourcetype == ZPROP_SRC_DEFAULT ||
539 sourcetype == ZPROP_SRC_INHERITED ||
540 (clp->cl_shareprop != ZPROP_INVAL &&
541 (share_sourcetype == ZPROP_SRC_DEFAULT ||
542 share_sourcetype == ZPROP_SRC_INHERITED))) {
543 cn = zfs_alloc(zfs_get_handle(zhp), sizeof (prop_changenode_t));
544 cn->cn_handle = zhp;
545 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
546 zfs_is_mounted(zhp, NULL);
547 cn->cn_shared = zfs_is_shared(zhp, NULL, NULL);
548 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
549 cn->cn_needpost = B_TRUE;
550
551 /* Indicate if any child is exported to a local zone. */
552 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
553 clp->cl_haszonedchild = B_TRUE;
554
555 uu_avl_node_init(cn, &cn->cn_treenode, clp->cl_pool);
556
557 uu_avl_index_t idx;
558
559 if (uu_avl_find(clp->cl_tree, cn, NULL, &idx) == NULL) {
560 uu_avl_insert(clp->cl_tree, cn, idx);
561 } else {
562 free(cn);
563 cn = NULL;
564 }
565
566 if (!clp->cl_alldependents) {
567 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT) {
568 ret = zfs_iter_filesystems_v2(zhp, 0,
569 change_one, data);
570 } else {
571 ret = zfs_iter_children_v2(zhp, 0, change_one,
572 data);
573 }
574 }
575
576 /*
577 * If we added the handle to the changelist, we will re-use it
578 * later so return without closing it.
579 */
580 if (cn != NULL)
581 return (ret);
582 }
583
584 out:
585 zfs_close(zhp);
586 return (ret);
587 }
588
589 static int
compare_props(const void * a,const void * b,zfs_prop_t prop)590 compare_props(const void *a, const void *b, zfs_prop_t prop)
591 {
592 const prop_changenode_t *ca = a;
593 const prop_changenode_t *cb = b;
594
595 char propa[MAXPATHLEN];
596 char propb[MAXPATHLEN];
597
598 boolean_t haspropa, haspropb;
599
600 haspropa = (zfs_prop_get(ca->cn_handle, prop, propa, sizeof (propa),
601 NULL, NULL, 0, B_FALSE) == 0);
602 haspropb = (zfs_prop_get(cb->cn_handle, prop, propb, sizeof (propb),
603 NULL, NULL, 0, B_FALSE) == 0);
604
605 if (!haspropa && haspropb)
606 return (-1);
607 else if (haspropa && !haspropb)
608 return (1);
609 else if (!haspropa && !haspropb)
610 return (0);
611 else
612 return (strcmp(propb, propa));
613 }
614
615 static int
compare_mountpoints(const void * a,const void * b,void * unused)616 compare_mountpoints(const void *a, const void *b, void *unused)
617 {
618 /*
619 * When unsharing or unmounting filesystems, we need to do it in
620 * mountpoint order. This allows the user to have a mountpoint
621 * hierarchy that is different from the dataset hierarchy, and still
622 * allow it to be changed.
623 */
624 (void) unused;
625 return (compare_props(a, b, ZFS_PROP_MOUNTPOINT));
626 }
627
628 static int
compare_dataset_names(const void * a,const void * b,void * unused)629 compare_dataset_names(const void *a, const void *b, void *unused)
630 {
631 (void) unused;
632 return (compare_props(a, b, ZFS_PROP_NAME));
633 }
634
635 /*
636 * Given a ZFS handle and a property, construct a complete list of datasets
637 * that need to be modified as part of this process. For anything but the
638 * 'mountpoint' and 'sharenfs' properties, this just returns an empty list.
639 * Otherwise, we iterate over all children and look for any datasets that
640 * inherit the property. For each such dataset, we add it to the list and
641 * mark whether it was shared beforehand.
642 */
643 prop_changelist_t *
changelist_gather(zfs_handle_t * zhp,zfs_prop_t prop,int gather_flags,int mnt_flags)644 changelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int gather_flags,
645 int mnt_flags)
646 {
647 prop_changelist_t *clp;
648 prop_changenode_t *cn;
649 zfs_handle_t *temp;
650 char property[ZFS_MAXPROPLEN];
651 boolean_t legacy = B_FALSE;
652
653 clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t));
654
655 /*
656 * For mountpoint-related tasks, we want to sort everything by
657 * mountpoint, so that we mount and unmount them in the appropriate
658 * order, regardless of their position in the hierarchy.
659 */
660 if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED ||
661 prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS ||
662 prop == ZFS_PROP_SHARESMB) {
663
664 if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
665 property, sizeof (property),
666 NULL, NULL, 0, B_FALSE) == 0 &&
667 (strcmp(property, "legacy") == 0 ||
668 strcmp(property, "none") == 0)) {
669 legacy = B_TRUE;
670 }
671 }
672
673 clp->cl_pool = uu_avl_pool_create("changelist_pool",
674 sizeof (prop_changenode_t),
675 offsetof(prop_changenode_t, cn_treenode),
676 legacy ? compare_dataset_names : compare_mountpoints, 0);
677 if (clp->cl_pool == NULL) {
678 assert(uu_error() == UU_ERROR_NO_MEMORY);
679 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
680 changelist_free(clp);
681 return (NULL);
682 }
683
684 clp->cl_tree = uu_avl_create(clp->cl_pool, NULL, UU_DEFAULT);
685 clp->cl_gflags = gather_flags;
686 clp->cl_mflags = mnt_flags;
687
688 if (clp->cl_tree == NULL) {
689 assert(uu_error() == UU_ERROR_NO_MEMORY);
690 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
691 changelist_free(clp);
692 return (NULL);
693 }
694
695 /*
696 * If this is a rename or the 'zoned' property, we pretend we're
697 * changing the mountpoint and flag it so we can catch all children in
698 * change_one().
699 *
700 * Flag cl_alldependents to catch all children plus the dependents
701 * (clones) that are not in the hierarchy.
702 */
703 if (prop == ZFS_PROP_NAME) {
704 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
705 clp->cl_alldependents = B_TRUE;
706 } else if (prop == ZFS_PROP_ZONED) {
707 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
708 clp->cl_allchildren = B_TRUE;
709 } else if (prop == ZFS_PROP_CANMOUNT) {
710 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
711 } else if (prop == ZFS_PROP_VOLSIZE) {
712 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
713 } else {
714 clp->cl_prop = prop;
715 }
716 clp->cl_realprop = prop;
717
718 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
719 clp->cl_prop != ZFS_PROP_SHARENFS &&
720 clp->cl_prop != ZFS_PROP_SHARESMB)
721 return (clp);
722
723 /*
724 * If watching SHARENFS or SHARESMB then
725 * also watch its companion property.
726 */
727 if (clp->cl_prop == ZFS_PROP_SHARENFS)
728 clp->cl_shareprop = ZFS_PROP_SHARESMB;
729 else if (clp->cl_prop == ZFS_PROP_SHARESMB)
730 clp->cl_shareprop = ZFS_PROP_SHARENFS;
731
732 if (clp->cl_prop == ZFS_PROP_MOUNTPOINT &&
733 (clp->cl_gflags & CL_GATHER_ITER_MOUNTED)) {
734 /*
735 * Instead of iterating through all of the dataset children we
736 * gather mounted dataset children from MNTTAB
737 */
738 if (zfs_iter_mounted(zhp, changelist_add_mounted, clp) != 0) {
739 changelist_free(clp);
740 return (NULL);
741 }
742 } else if (clp->cl_alldependents) {
743 if (zfs_iter_dependents_v2(zhp, 0, B_TRUE, change_one,
744 clp) != 0) {
745 changelist_free(clp);
746 return (NULL);
747 }
748 } else if (clp->cl_prop != ZFS_PROP_MOUNTPOINT) {
749 if (zfs_iter_filesystems_v2(zhp, 0, change_one, clp) != 0) {
750 changelist_free(clp);
751 return (NULL);
752 }
753 } else if (zfs_iter_children_v2(zhp, 0, change_one, clp) != 0) {
754 changelist_free(clp);
755 return (NULL);
756 }
757
758 /*
759 * We have to re-open ourselves because we auto-close all the handles
760 * and can't tell the difference.
761 */
762 if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp),
763 ZFS_TYPE_DATASET)) == NULL) {
764 changelist_free(clp);
765 return (NULL);
766 }
767
768 /*
769 * Always add ourself to the list. We add ourselves to the end so that
770 * we're the last to be unmounted.
771 */
772 cn = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changenode_t));
773 cn->cn_handle = temp;
774 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
775 zfs_is_mounted(temp, NULL);
776 cn->cn_shared = zfs_is_shared(temp, NULL, NULL);
777 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
778 cn->cn_needpost = B_TRUE;
779
780 uu_avl_node_init(cn, &cn->cn_treenode, clp->cl_pool);
781 uu_avl_index_t idx;
782 if (uu_avl_find(clp->cl_tree, cn, NULL, &idx) == NULL) {
783 uu_avl_insert(clp->cl_tree, cn, idx);
784 } else {
785 free(cn);
786 zfs_close(temp);
787 }
788
789 /*
790 * If the mountpoint property was previously 'legacy', or 'none',
791 * record it as the behavior of changelist_postfix() will be different.
792 */
793 if ((clp->cl_prop == ZFS_PROP_MOUNTPOINT) && legacy) {
794 /*
795 * do not automatically mount ex-legacy datasets if
796 * we specifically set canmount to noauto
797 */
798 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) !=
799 ZFS_CANMOUNT_NOAUTO)
800 clp->cl_waslegacy = B_TRUE;
801 }
802
803 return (clp);
804 }
805