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34dc7c2f BB |
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 | /* | |
428870ff | 23 | * Copyright 2010 Sun Microsystems, Inc. All rights reserved. |
34dc7c2f BB |
24 | * Use is subject to license terms. |
25 | * | |
26 | * Portions Copyright 2007 Ramprakash Jelari | |
27 | */ | |
28 | ||
34dc7c2f BB |
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; | |
b128c09f BB |
81 | int cl_mflags; /* Mount flags */ |
82 | int cl_gflags; /* Gather request flags */ | |
34dc7c2f BB |
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 | { | |
d603ed6c | 96 | #ifdef HAVE_ZPL |
34dc7c2f BB |
97 | prop_changenode_t *cn; |
98 | int ret = 0; | |
99 | ||
100 | if (clp->cl_prop != ZFS_PROP_MOUNTPOINT && | |
101 | clp->cl_prop != ZFS_PROP_SHARESMB) | |
102 | return (0); | |
103 | ||
104 | for (cn = uu_list_first(clp->cl_list); cn != NULL; | |
105 | cn = uu_list_next(clp->cl_list, cn)) { | |
106 | ||
107 | /* if a previous loop failed, set the remaining to false */ | |
108 | if (ret == -1) { | |
109 | cn->cn_needpost = B_FALSE; | |
110 | continue; | |
111 | } | |
112 | ||
113 | /* | |
114 | * If we are in the global zone, but this dataset is exported | |
115 | * to a local zone, do nothing. | |
116 | */ | |
117 | if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned) | |
118 | continue; | |
119 | ||
428870ff | 120 | if (!ZFS_IS_VOLUME(cn->cn_handle)) { |
34dc7c2f BB |
121 | /* |
122 | * Do the property specific processing. | |
123 | */ | |
124 | switch (clp->cl_prop) { | |
125 | case ZFS_PROP_MOUNTPOINT: | |
126 | if (zfs_unmount(cn->cn_handle, NULL, | |
b128c09f | 127 | clp->cl_mflags) != 0) { |
34dc7c2f BB |
128 | ret = -1; |
129 | cn->cn_needpost = B_FALSE; | |
130 | } | |
131 | break; | |
132 | case ZFS_PROP_SHARESMB: | |
133 | (void) zfs_unshare_smb(cn->cn_handle, NULL); | |
134 | break; | |
e75c13c3 BB |
135 | default: |
136 | break; | |
34dc7c2f BB |
137 | } |
138 | } | |
139 | } | |
140 | ||
141 | if (ret == -1) | |
142 | (void) changelist_postfix(clp); | |
143 | ||
144 | return (ret); | |
d603ed6c BB |
145 | #else |
146 | return 0; | |
147 | #endif /* HAVE_ZPL */ | |
34dc7c2f BB |
148 | } |
149 | ||
150 | /* | |
151 | * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or | |
152 | * reshare the filesystems as necessary. In changelist_gather() we recorded | |
153 | * whether the filesystem was previously shared or mounted. The action we take | |
154 | * depends on the previous state, and whether the value was previously 'legacy'. | |
155 | * For non-legacy properties, we only remount/reshare the filesystem if it was | |
156 | * previously mounted/shared. Otherwise, we always remount/reshare the | |
157 | * filesystem. | |
158 | */ | |
159 | int | |
160 | changelist_postfix(prop_changelist_t *clp) | |
161 | { | |
d603ed6c | 162 | #ifdef HAVE_ZPL |
34dc7c2f BB |
163 | prop_changenode_t *cn; |
164 | char shareopts[ZFS_MAXPROPLEN]; | |
165 | int errors = 0; | |
166 | libzfs_handle_t *hdl; | |
167 | ||
168 | /* | |
169 | * If we're changing the mountpoint, attempt to destroy the underlying | |
170 | * mountpoint. All other datasets will have inherited from this dataset | |
171 | * (in which case their mountpoints exist in the filesystem in the new | |
172 | * location), or have explicit mountpoints set (in which case they won't | |
173 | * be in the changelist). | |
174 | */ | |
175 | if ((cn = uu_list_last(clp->cl_list)) == NULL) | |
176 | return (0); | |
177 | ||
178 | if (clp->cl_prop == ZFS_PROP_MOUNTPOINT) | |
179 | remove_mountpoint(cn->cn_handle); | |
180 | ||
181 | /* | |
182 | * It is possible that the changelist_prefix() used libshare | |
183 | * to unshare some entries. Since libshare caches data, an | |
184 | * attempt to reshare during postfix can fail unless libshare | |
185 | * is uninitialized here so that it will reinitialize later. | |
186 | */ | |
187 | if (cn->cn_handle != NULL) { | |
188 | hdl = cn->cn_handle->zfs_hdl; | |
189 | assert(hdl != NULL); | |
190 | zfs_uninit_libshare(hdl); | |
191 | } | |
192 | ||
193 | /* | |
194 | * We walk the datasets in reverse, because we want to mount any parent | |
195 | * datasets before mounting the children. We walk all datasets even if | |
196 | * there are errors. | |
197 | */ | |
198 | for (cn = uu_list_last(clp->cl_list); cn != NULL; | |
199 | cn = uu_list_prev(clp->cl_list, cn)) { | |
200 | ||
201 | boolean_t sharenfs; | |
202 | boolean_t sharesmb; | |
9babb374 | 203 | boolean_t mounted; |
34dc7c2f BB |
204 | |
205 | /* | |
206 | * If we are in the global zone, but this dataset is exported | |
207 | * to a local zone, do nothing. | |
208 | */ | |
209 | if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned) | |
210 | continue; | |
211 | ||
212 | /* Only do post-processing if it's required */ | |
213 | if (!cn->cn_needpost) | |
214 | continue; | |
215 | cn->cn_needpost = B_FALSE; | |
216 | ||
217 | zfs_refresh_properties(cn->cn_handle); | |
218 | ||
428870ff | 219 | if (ZFS_IS_VOLUME(cn->cn_handle)) |
34dc7c2f | 220 | continue; |
34dc7c2f BB |
221 | |
222 | /* | |
223 | * Remount if previously mounted or mountpoint was legacy, | |
224 | * or sharenfs or sharesmb property is set. | |
225 | */ | |
226 | sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS, | |
227 | shareopts, sizeof (shareopts), NULL, NULL, 0, | |
228 | B_FALSE) == 0) && (strcmp(shareopts, "off") != 0)); | |
229 | ||
230 | sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB, | |
231 | shareopts, sizeof (shareopts), NULL, NULL, 0, | |
232 | B_FALSE) == 0) && (strcmp(shareopts, "off") != 0)); | |
233 | ||
9babb374 BB |
234 | mounted = zfs_is_mounted(cn->cn_handle, NULL); |
235 | ||
236 | if (!mounted && (cn->cn_mounted || | |
237 | ((sharenfs || sharesmb || clp->cl_waslegacy) && | |
238 | (zfs_prop_get_int(cn->cn_handle, | |
239 | ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON)))) { | |
240 | ||
241 | if (zfs_mount(cn->cn_handle, NULL, 0) != 0) | |
242 | errors++; | |
243 | else | |
244 | mounted = TRUE; | |
245 | } | |
34dc7c2f BB |
246 | |
247 | /* | |
9babb374 BB |
248 | * If the file system is mounted we always re-share even |
249 | * if the filesystem is currently shared, so that we can | |
250 | * adopt any new options. | |
34dc7c2f | 251 | */ |
9babb374 | 252 | if (sharenfs && mounted) |
34dc7c2f BB |
253 | errors += zfs_share_nfs(cn->cn_handle); |
254 | else if (cn->cn_shared || clp->cl_waslegacy) | |
255 | errors += zfs_unshare_nfs(cn->cn_handle, NULL); | |
9babb374 | 256 | if (sharesmb && mounted) |
34dc7c2f BB |
257 | errors += zfs_share_smb(cn->cn_handle); |
258 | else if (cn->cn_shared || clp->cl_waslegacy) | |
259 | errors += zfs_unshare_smb(cn->cn_handle, NULL); | |
260 | } | |
261 | ||
262 | return (errors ? -1 : 0); | |
d603ed6c BB |
263 | #else |
264 | return 0; | |
265 | #endif /* HAVE_ZPL */ | |
34dc7c2f BB |
266 | } |
267 | ||
268 | /* | |
269 | * Is this "dataset" a child of "parent"? | |
270 | */ | |
271 | boolean_t | |
272 | isa_child_of(const char *dataset, const char *parent) | |
273 | { | |
274 | int len; | |
275 | ||
276 | len = strlen(parent); | |
277 | ||
278 | if (strncmp(dataset, parent, len) == 0 && | |
279 | (dataset[len] == '@' || dataset[len] == '/' || | |
280 | dataset[len] == '\0')) | |
281 | return (B_TRUE); | |
282 | else | |
283 | return (B_FALSE); | |
284 | ||
285 | } | |
286 | ||
287 | /* | |
288 | * If we rename a filesystem, child filesystem handles are no longer valid | |
289 | * since we identify each dataset by its name in the ZFS namespace. As a | |
290 | * result, we have to go through and fix up all the names appropriately. We | |
291 | * could do this automatically if libzfs kept track of all open handles, but | |
292 | * this is a lot less work. | |
293 | */ | |
294 | void | |
295 | changelist_rename(prop_changelist_t *clp, const char *src, const char *dst) | |
296 | { | |
297 | prop_changenode_t *cn; | |
298 | char newname[ZFS_MAXNAMELEN]; | |
299 | ||
300 | for (cn = uu_list_first(clp->cl_list); cn != NULL; | |
301 | cn = uu_list_next(clp->cl_list, cn)) { | |
302 | /* | |
303 | * Do not rename a clone that's not in the source hierarchy. | |
304 | */ | |
305 | if (!isa_child_of(cn->cn_handle->zfs_name, src)) | |
306 | continue; | |
307 | ||
308 | /* | |
309 | * Destroy the previous mountpoint if needed. | |
310 | */ | |
311 | remove_mountpoint(cn->cn_handle); | |
312 | ||
313 | (void) strlcpy(newname, dst, sizeof (newname)); | |
314 | (void) strcat(newname, cn->cn_handle->zfs_name + strlen(src)); | |
315 | ||
316 | (void) strlcpy(cn->cn_handle->zfs_name, newname, | |
317 | sizeof (cn->cn_handle->zfs_name)); | |
318 | } | |
319 | } | |
320 | ||
321 | /* | |
322 | * Given a gathered changelist for the 'sharenfs' or 'sharesmb' property, | |
323 | * unshare all the datasets in the list. | |
324 | */ | |
325 | int | |
326 | changelist_unshare(prop_changelist_t *clp, zfs_share_proto_t *proto) | |
327 | { | |
d603ed6c | 328 | #ifdef HAVE_ZPL |
34dc7c2f BB |
329 | prop_changenode_t *cn; |
330 | int ret = 0; | |
331 | ||
332 | if (clp->cl_prop != ZFS_PROP_SHARENFS && | |
333 | clp->cl_prop != ZFS_PROP_SHARESMB) | |
334 | return (0); | |
335 | ||
336 | for (cn = uu_list_first(clp->cl_list); cn != NULL; | |
337 | cn = uu_list_next(clp->cl_list, cn)) { | |
338 | if (zfs_unshare_proto(cn->cn_handle, NULL, proto) != 0) | |
339 | ret = -1; | |
340 | } | |
341 | ||
342 | return (ret); | |
d603ed6c BB |
343 | #else |
344 | return 0; | |
345 | #endif | |
34dc7c2f BB |
346 | } |
347 | ||
348 | /* | |
349 | * Check if there is any child exported to a local zone in a given changelist. | |
350 | * This information has already been recorded while gathering the changelist | |
351 | * via changelist_gather(). | |
352 | */ | |
353 | int | |
354 | changelist_haszonedchild(prop_changelist_t *clp) | |
355 | { | |
356 | return (clp->cl_haszonedchild); | |
357 | } | |
358 | ||
359 | /* | |
360 | * Remove a node from a gathered list. | |
361 | */ | |
362 | void | |
363 | changelist_remove(prop_changelist_t *clp, const char *name) | |
364 | { | |
365 | prop_changenode_t *cn; | |
366 | ||
367 | for (cn = uu_list_first(clp->cl_list); cn != NULL; | |
368 | cn = uu_list_next(clp->cl_list, cn)) { | |
369 | ||
370 | if (strcmp(cn->cn_handle->zfs_name, name) == 0) { | |
371 | uu_list_remove(clp->cl_list, cn); | |
372 | zfs_close(cn->cn_handle); | |
373 | free(cn); | |
374 | return; | |
375 | } | |
376 | } | |
377 | } | |
378 | ||
379 | /* | |
380 | * Release any memory associated with a changelist. | |
381 | */ | |
382 | void | |
383 | changelist_free(prop_changelist_t *clp) | |
384 | { | |
385 | prop_changenode_t *cn; | |
386 | void *cookie; | |
387 | ||
388 | if (clp->cl_list) { | |
389 | cookie = NULL; | |
390 | while ((cn = uu_list_teardown(clp->cl_list, &cookie)) != NULL) { | |
391 | zfs_close(cn->cn_handle); | |
392 | free(cn); | |
393 | } | |
394 | ||
395 | uu_list_destroy(clp->cl_list); | |
396 | } | |
397 | if (clp->cl_pool) | |
398 | uu_list_pool_destroy(clp->cl_pool); | |
399 | ||
400 | free(clp); | |
401 | } | |
402 | ||
403 | static int | |
404 | change_one(zfs_handle_t *zhp, void *data) | |
405 | { | |
406 | prop_changelist_t *clp = data; | |
407 | char property[ZFS_MAXPROPLEN]; | |
408 | char where[64]; | |
409 | prop_changenode_t *cn; | |
410 | zprop_source_t sourcetype; | |
411 | zprop_source_t share_sourcetype; | |
412 | ||
413 | /* | |
414 | * We only want to unmount/unshare those filesystems that may inherit | |
415 | * from the target filesystem. If we find any filesystem with a | |
416 | * locally set mountpoint, we ignore any children since changing the | |
417 | * property will not affect them. If this is a rename, we iterate | |
418 | * over all children regardless, since we need them unmounted in | |
419 | * order to do the rename. Also, if this is a volume and we're doing | |
420 | * a rename, then always add it to the changelist. | |
421 | */ | |
422 | ||
423 | if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) && | |
424 | zfs_prop_get(zhp, clp->cl_prop, property, | |
425 | sizeof (property), &sourcetype, where, sizeof (where), | |
426 | B_FALSE) != 0) { | |
427 | zfs_close(zhp); | |
428 | return (0); | |
429 | } | |
430 | ||
431 | /* | |
432 | * If we are "watching" sharenfs or sharesmb | |
433 | * then check out the companion property which is tracked | |
434 | * in cl_shareprop | |
435 | */ | |
436 | if (clp->cl_shareprop != ZPROP_INVAL && | |
437 | zfs_prop_get(zhp, clp->cl_shareprop, property, | |
438 | sizeof (property), &share_sourcetype, where, sizeof (where), | |
439 | B_FALSE) != 0) { | |
440 | zfs_close(zhp); | |
441 | return (0); | |
442 | } | |
443 | ||
444 | if (clp->cl_alldependents || clp->cl_allchildren || | |
445 | sourcetype == ZPROP_SRC_DEFAULT || | |
446 | sourcetype == ZPROP_SRC_INHERITED || | |
447 | (clp->cl_shareprop != ZPROP_INVAL && | |
448 | (share_sourcetype == ZPROP_SRC_DEFAULT || | |
449 | share_sourcetype == ZPROP_SRC_INHERITED))) { | |
450 | if ((cn = zfs_alloc(zfs_get_handle(zhp), | |
451 | sizeof (prop_changenode_t))) == NULL) { | |
452 | zfs_close(zhp); | |
453 | return (-1); | |
454 | } | |
455 | ||
456 | cn->cn_handle = zhp; | |
b128c09f BB |
457 | cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) || |
458 | zfs_is_mounted(zhp, NULL); | |
34dc7c2f BB |
459 | cn->cn_shared = zfs_is_shared(zhp); |
460 | cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED); | |
461 | cn->cn_needpost = B_TRUE; | |
462 | ||
463 | /* Indicate if any child is exported to a local zone. */ | |
464 | if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned) | |
465 | clp->cl_haszonedchild = B_TRUE; | |
466 | ||
467 | uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool); | |
468 | ||
469 | if (clp->cl_sorted) { | |
470 | uu_list_index_t idx; | |
471 | ||
472 | (void) uu_list_find(clp->cl_list, cn, NULL, | |
473 | &idx); | |
474 | uu_list_insert(clp->cl_list, cn, idx); | |
475 | } else { | |
45d1cae3 BB |
476 | /* |
477 | * Add this child to beginning of the list. Children | |
478 | * below this one in the hierarchy will get added above | |
479 | * this one in the list. This produces a list in | |
480 | * reverse dataset name order. | |
481 | * This is necessary when the original mountpoint | |
482 | * is legacy or none. | |
483 | */ | |
34dc7c2f BB |
484 | ASSERT(!clp->cl_alldependents); |
485 | verify(uu_list_insert_before(clp->cl_list, | |
486 | uu_list_first(clp->cl_list), cn) == 0); | |
487 | } | |
488 | ||
489 | if (!clp->cl_alldependents) | |
490 | return (zfs_iter_children(zhp, change_one, data)); | |
491 | } else { | |
492 | zfs_close(zhp); | |
493 | } | |
494 | ||
495 | return (0); | |
496 | } | |
497 | ||
498 | /*ARGSUSED*/ | |
499 | static int | |
500 | compare_mountpoints(const void *a, const void *b, void *unused) | |
501 | { | |
502 | const prop_changenode_t *ca = a; | |
503 | const prop_changenode_t *cb = b; | |
504 | ||
505 | char mounta[MAXPATHLEN]; | |
506 | char mountb[MAXPATHLEN]; | |
507 | ||
508 | boolean_t hasmounta, hasmountb; | |
509 | ||
510 | /* | |
511 | * When unsharing or unmounting filesystems, we need to do it in | |
512 | * mountpoint order. This allows the user to have a mountpoint | |
513 | * hierarchy that is different from the dataset hierarchy, and still | |
514 | * allow it to be changed. However, if either dataset doesn't have a | |
515 | * mountpoint (because it is a volume or a snapshot), we place it at the | |
516 | * end of the list, because it doesn't affect our change at all. | |
517 | */ | |
518 | hasmounta = (zfs_prop_get(ca->cn_handle, ZFS_PROP_MOUNTPOINT, mounta, | |
519 | sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0); | |
520 | hasmountb = (zfs_prop_get(cb->cn_handle, ZFS_PROP_MOUNTPOINT, mountb, | |
521 | sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0); | |
522 | ||
523 | if (!hasmounta && hasmountb) | |
524 | return (-1); | |
525 | else if (hasmounta && !hasmountb) | |
526 | return (1); | |
527 | else if (!hasmounta && !hasmountb) | |
528 | return (0); | |
529 | else | |
530 | return (strcmp(mountb, mounta)); | |
531 | } | |
532 | ||
533 | /* | |
534 | * Given a ZFS handle and a property, construct a complete list of datasets | |
535 | * that need to be modified as part of this process. For anything but the | |
536 | * 'mountpoint' and 'sharenfs' properties, this just returns an empty list. | |
537 | * Otherwise, we iterate over all children and look for any datasets that | |
538 | * inherit the property. For each such dataset, we add it to the list and | |
539 | * mark whether it was shared beforehand. | |
540 | */ | |
541 | prop_changelist_t * | |
b128c09f BB |
542 | changelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int gather_flags, |
543 | int mnt_flags) | |
34dc7c2f BB |
544 | { |
545 | prop_changelist_t *clp; | |
546 | prop_changenode_t *cn; | |
547 | zfs_handle_t *temp; | |
548 | char property[ZFS_MAXPROPLEN]; | |
549 | uu_compare_fn_t *compare = NULL; | |
45d1cae3 | 550 | boolean_t legacy = B_FALSE; |
34dc7c2f BB |
551 | |
552 | if ((clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t))) == NULL) | |
553 | return (NULL); | |
554 | ||
555 | /* | |
556 | * For mountpoint-related tasks, we want to sort everything by | |
557 | * mountpoint, so that we mount and unmount them in the appropriate | |
558 | * order, regardless of their position in the hierarchy. | |
559 | */ | |
560 | if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED || | |
561 | prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS || | |
562 | prop == ZFS_PROP_SHARESMB) { | |
45d1cae3 BB |
563 | |
564 | if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, | |
565 | property, sizeof (property), | |
566 | NULL, NULL, 0, B_FALSE) == 0 && | |
567 | (strcmp(property, "legacy") == 0 || | |
568 | strcmp(property, "none") == 0)) { | |
569 | ||
570 | legacy = B_TRUE; | |
571 | } | |
572 | if (!legacy) { | |
573 | compare = compare_mountpoints; | |
574 | clp->cl_sorted = B_TRUE; | |
575 | } | |
34dc7c2f BB |
576 | } |
577 | ||
578 | clp->cl_pool = uu_list_pool_create("changelist_pool", | |
579 | sizeof (prop_changenode_t), | |
580 | offsetof(prop_changenode_t, cn_listnode), | |
581 | compare, 0); | |
582 | if (clp->cl_pool == NULL) { | |
583 | assert(uu_error() == UU_ERROR_NO_MEMORY); | |
584 | (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error"); | |
585 | changelist_free(clp); | |
586 | return (NULL); | |
587 | } | |
588 | ||
589 | clp->cl_list = uu_list_create(clp->cl_pool, NULL, | |
590 | clp->cl_sorted ? UU_LIST_SORTED : 0); | |
b128c09f BB |
591 | clp->cl_gflags = gather_flags; |
592 | clp->cl_mflags = mnt_flags; | |
34dc7c2f BB |
593 | |
594 | if (clp->cl_list == NULL) { | |
595 | assert(uu_error() == UU_ERROR_NO_MEMORY); | |
596 | (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error"); | |
597 | changelist_free(clp); | |
598 | return (NULL); | |
599 | } | |
600 | ||
601 | /* | |
602 | * If this is a rename or the 'zoned' property, we pretend we're | |
603 | * changing the mountpoint and flag it so we can catch all children in | |
604 | * change_one(). | |
605 | * | |
606 | * Flag cl_alldependents to catch all children plus the dependents | |
607 | * (clones) that are not in the hierarchy. | |
608 | */ | |
609 | if (prop == ZFS_PROP_NAME) { | |
610 | clp->cl_prop = ZFS_PROP_MOUNTPOINT; | |
611 | clp->cl_alldependents = B_TRUE; | |
612 | } else if (prop == ZFS_PROP_ZONED) { | |
613 | clp->cl_prop = ZFS_PROP_MOUNTPOINT; | |
614 | clp->cl_allchildren = B_TRUE; | |
615 | } else if (prop == ZFS_PROP_CANMOUNT) { | |
616 | clp->cl_prop = ZFS_PROP_MOUNTPOINT; | |
617 | } else if (prop == ZFS_PROP_VOLSIZE) { | |
618 | clp->cl_prop = ZFS_PROP_MOUNTPOINT; | |
34dc7c2f BB |
619 | } else { |
620 | clp->cl_prop = prop; | |
621 | } | |
622 | clp->cl_realprop = prop; | |
623 | ||
624 | if (clp->cl_prop != ZFS_PROP_MOUNTPOINT && | |
625 | clp->cl_prop != ZFS_PROP_SHARENFS && | |
428870ff | 626 | clp->cl_prop != ZFS_PROP_SHARESMB) |
34dc7c2f BB |
627 | return (clp); |
628 | ||
629 | /* | |
630 | * If watching SHARENFS or SHARESMB then | |
631 | * also watch its companion property. | |
632 | */ | |
633 | if (clp->cl_prop == ZFS_PROP_SHARENFS) | |
634 | clp->cl_shareprop = ZFS_PROP_SHARESMB; | |
635 | else if (clp->cl_prop == ZFS_PROP_SHARESMB) | |
636 | clp->cl_shareprop = ZFS_PROP_SHARENFS; | |
637 | ||
638 | if (clp->cl_alldependents) { | |
639 | if (zfs_iter_dependents(zhp, B_TRUE, change_one, clp) != 0) { | |
640 | changelist_free(clp); | |
641 | return (NULL); | |
642 | } | |
643 | } else if (zfs_iter_children(zhp, change_one, clp) != 0) { | |
644 | changelist_free(clp); | |
645 | return (NULL); | |
646 | } | |
647 | ||
648 | /* | |
649 | * We have to re-open ourselves because we auto-close all the handles | |
650 | * and can't tell the difference. | |
651 | */ | |
652 | if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp), | |
653 | ZFS_TYPE_DATASET)) == NULL) { | |
654 | changelist_free(clp); | |
655 | return (NULL); | |
656 | } | |
657 | ||
658 | /* | |
659 | * Always add ourself to the list. We add ourselves to the end so that | |
660 | * we're the last to be unmounted. | |
661 | */ | |
662 | if ((cn = zfs_alloc(zhp->zfs_hdl, | |
663 | sizeof (prop_changenode_t))) == NULL) { | |
664 | zfs_close(temp); | |
665 | changelist_free(clp); | |
666 | return (NULL); | |
667 | } | |
668 | ||
669 | cn->cn_handle = temp; | |
b128c09f BB |
670 | cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) || |
671 | zfs_is_mounted(temp, NULL); | |
34dc7c2f BB |
672 | cn->cn_shared = zfs_is_shared(temp); |
673 | cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED); | |
674 | cn->cn_needpost = B_TRUE; | |
675 | ||
676 | uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool); | |
677 | if (clp->cl_sorted) { | |
678 | uu_list_index_t idx; | |
679 | (void) uu_list_find(clp->cl_list, cn, NULL, &idx); | |
680 | uu_list_insert(clp->cl_list, cn, idx); | |
681 | } else { | |
45d1cae3 BB |
682 | /* |
683 | * Add the target dataset to the end of the list. | |
684 | * The list is not really unsorted. The list will be | |
685 | * in reverse dataset name order. This is necessary | |
686 | * when the original mountpoint is legacy or none. | |
687 | */ | |
34dc7c2f BB |
688 | verify(uu_list_insert_after(clp->cl_list, |
689 | uu_list_last(clp->cl_list), cn) == 0); | |
690 | } | |
691 | ||
692 | /* | |
693 | * If the mountpoint property was previously 'legacy', or 'none', | |
694 | * record it as the behavior of changelist_postfix() will be different. | |
695 | */ | |
45d1cae3 | 696 | if ((clp->cl_prop == ZFS_PROP_MOUNTPOINT) && legacy) { |
34dc7c2f BB |
697 | /* |
698 | * do not automatically mount ex-legacy datasets if | |
699 | * we specifically set canmount to noauto | |
700 | */ | |
701 | if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) != | |
702 | ZFS_CANMOUNT_NOAUTO) | |
703 | clp->cl_waslegacy = B_TRUE; | |
704 | } | |
705 | ||
706 | return (clp); | |
707 | } |