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.
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.
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]
23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
26 * Portions Copyright 2007 Ramprakash Jelari
39 #include "libzfs_impl.h"
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.
47 * The interface consists of the following sequence of functions:
52 * changelist_postfix()
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
63 typedef struct prop_changenode {
64 zfs_handle_t *cn_handle;
68 boolean_t cn_needpost; /* is postfix() needed? */
69 uu_list_node_t cn_listnode;
72 struct prop_changelist {
74 zfs_prop_t cl_realprop;
75 zfs_prop_t cl_shareprop; /* used with sharenfs/sharesmb */
76 uu_list_pool_t *cl_pool;
78 boolean_t cl_waslegacy;
79 boolean_t cl_allchildren;
80 boolean_t cl_alldependents;
81 int cl_mflags; /* Mount flags */
82 int cl_gflags; /* Gather request flags */
83 boolean_t cl_haszonedchild;
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.
94 changelist_prefix(prop_changelist_t *clp)
96 prop_changenode_t *cn;
99 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
100 clp->cl_prop != ZFS_PROP_SHARESMB)
103 for (cn = uu_list_first(clp->cl_list); cn != NULL;
104 cn = uu_list_next(clp->cl_list, cn)) {
106 /* if a previous loop failed, set the remaining to false */
108 cn->cn_needpost = B_FALSE;
113 * If we are in the global zone, but this dataset is exported
114 * to a local zone, do nothing.
116 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
119 if (!ZFS_IS_VOLUME(cn->cn_handle)) {
121 * Do the property specific processing.
123 switch (clp->cl_prop) {
124 case ZFS_PROP_MOUNTPOINT:
125 if (zfs_unmount(cn->cn_handle, NULL,
126 clp->cl_mflags) != 0) {
128 cn->cn_needpost = B_FALSE;
131 case ZFS_PROP_SHARESMB:
132 (void) zfs_unshare_smb(cn->cn_handle, NULL);
141 (void) changelist_postfix(clp);
147 * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or
148 * reshare the filesystems as necessary. In changelist_gather() we recorded
149 * whether the filesystem was previously shared or mounted. The action we take
150 * depends on the previous state, and whether the value was previously 'legacy'.
151 * For non-legacy properties, we only remount/reshare the filesystem if it was
152 * previously mounted/shared. Otherwise, we always remount/reshare the
156 changelist_postfix(prop_changelist_t *clp)
158 prop_changenode_t *cn;
159 char shareopts[ZFS_MAXPROPLEN];
161 libzfs_handle_t *hdl;
164 * If we're changing the mountpoint, attempt to destroy the underlying
165 * mountpoint. All other datasets will have inherited from this dataset
166 * (in which case their mountpoints exist in the filesystem in the new
167 * location), or have explicit mountpoints set (in which case they won't
168 * be in the changelist).
170 if ((cn = uu_list_last(clp->cl_list)) == NULL)
173 if (clp->cl_prop == ZFS_PROP_MOUNTPOINT)
174 remove_mountpoint(cn->cn_handle);
177 * It is possible that the changelist_prefix() used libshare
178 * to unshare some entries. Since libshare caches data, an
179 * attempt to reshare during postfix can fail unless libshare
180 * is uninitialized here so that it will reinitialize later.
182 if (cn->cn_handle != NULL) {
183 hdl = cn->cn_handle->zfs_hdl;
185 zfs_uninit_libshare(hdl);
189 * We walk the datasets in reverse, because we want to mount any parent
190 * datasets before mounting the children. We walk all datasets even if
193 for (cn = uu_list_last(clp->cl_list); cn != NULL;
194 cn = uu_list_prev(clp->cl_list, cn)) {
201 * If we are in the global zone, but this dataset is exported
202 * to a local zone, do nothing.
204 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
207 /* Only do post-processing if it's required */
208 if (!cn->cn_needpost)
210 cn->cn_needpost = B_FALSE;
212 zfs_refresh_properties(cn->cn_handle);
214 if (ZFS_IS_VOLUME(cn->cn_handle))
218 * Remount if previously mounted or mountpoint was legacy,
219 * or sharenfs or sharesmb property is set.
221 sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS,
222 shareopts, sizeof (shareopts), NULL, NULL, 0,
223 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
225 sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB,
226 shareopts, sizeof (shareopts), NULL, NULL, 0,
227 B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
229 mounted = zfs_is_mounted(cn->cn_handle, NULL);
231 if (!mounted && (cn->cn_mounted ||
232 ((sharenfs || sharesmb || clp->cl_waslegacy) &&
233 (zfs_prop_get_int(cn->cn_handle,
234 ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON)))) {
236 if (zfs_mount(cn->cn_handle, NULL, 0) != 0)
243 * If the file system is mounted we always re-share even
244 * if the filesystem is currently shared, so that we can
245 * adopt any new options.
247 if (sharenfs && mounted)
248 errors += zfs_share_nfs(cn->cn_handle);
249 else if (cn->cn_shared || clp->cl_waslegacy)
250 errors += zfs_unshare_nfs(cn->cn_handle, NULL);
251 if (sharesmb && mounted)
252 errors += zfs_share_smb(cn->cn_handle);
253 else if (cn->cn_shared || clp->cl_waslegacy)
254 errors += zfs_unshare_smb(cn->cn_handle, NULL);
257 return (errors ? -1 : 0);
261 * Is this "dataset" a child of "parent"?
264 isa_child_of(const char *dataset, const char *parent)
268 len = strlen(parent);
270 if (strncmp(dataset, parent, len) == 0 &&
271 (dataset[len] == '@' || dataset[len] == '/' ||
272 dataset[len] == '\0'))
280 * If we rename a filesystem, child filesystem handles are no longer valid
281 * since we identify each dataset by its name in the ZFS namespace. As a
282 * result, we have to go through and fix up all the names appropriately. We
283 * could do this automatically if libzfs kept track of all open handles, but
284 * this is a lot less work.
287 changelist_rename(prop_changelist_t *clp, const char *src, const char *dst)
289 prop_changenode_t *cn;
290 char newname[ZFS_MAXNAMELEN];
292 for (cn = uu_list_first(clp->cl_list); cn != NULL;
293 cn = uu_list_next(clp->cl_list, cn)) {
299 * Do not rename a clone that's not in the source hierarchy.
301 if (!isa_child_of(hdl->zfs_name, src))
305 * Destroy the previous mountpoint if needed.
307 remove_mountpoint(hdl);
309 (void) strlcpy(newname, dst, sizeof (newname));
310 (void) strcat(newname, hdl->zfs_name + strlen(src));
312 if (ZFS_IS_VOLUME(hdl)) {
313 (void) zvol_remove_link(hdl->zfs_hdl, hdl->zfs_name);
314 (void) zvol_create_link(hdl->zfs_hdl, newname);
317 (void) strlcpy(hdl->zfs_name, newname, sizeof (hdl->zfs_name));
322 * Given a gathered changelist for the 'sharenfs' or 'sharesmb' property,
323 * unshare all the datasets in the list.
326 changelist_unshare(prop_changelist_t *clp, zfs_share_proto_t *proto)
328 prop_changenode_t *cn;
331 if (clp->cl_prop != ZFS_PROP_SHARENFS &&
332 clp->cl_prop != ZFS_PROP_SHARESMB)
335 for (cn = uu_list_first(clp->cl_list); cn != NULL;
336 cn = uu_list_next(clp->cl_list, cn)) {
337 if (zfs_unshare_proto(cn->cn_handle, NULL, proto) != 0)
345 * Check if there is any child exported to a local zone in a given changelist.
346 * This information has already been recorded while gathering the changelist
347 * via changelist_gather().
350 changelist_haszonedchild(prop_changelist_t *clp)
352 return (clp->cl_haszonedchild);
356 * Remove a node from a gathered list.
359 changelist_remove(prop_changelist_t *clp, const char *name)
361 prop_changenode_t *cn;
363 for (cn = uu_list_first(clp->cl_list); cn != NULL;
364 cn = uu_list_next(clp->cl_list, cn)) {
366 if (strcmp(cn->cn_handle->zfs_name, name) == 0) {
367 uu_list_remove(clp->cl_list, cn);
368 zfs_close(cn->cn_handle);
376 * Release any memory associated with a changelist.
379 changelist_free(prop_changelist_t *clp)
381 prop_changenode_t *cn;
386 while ((cn = uu_list_teardown(clp->cl_list, &cookie)) != NULL) {
387 zfs_close(cn->cn_handle);
391 uu_list_destroy(clp->cl_list);
394 uu_list_pool_destroy(clp->cl_pool);
400 change_one(zfs_handle_t *zhp, void *data)
402 prop_changelist_t *clp = data;
403 char property[ZFS_MAXPROPLEN];
405 prop_changenode_t *cn;
406 zprop_source_t sourcetype;
407 zprop_source_t share_sourcetype;
410 * We only want to unmount/unshare those filesystems that may inherit
411 * from the target filesystem. If we find any filesystem with a
412 * locally set mountpoint, we ignore any children since changing the
413 * property will not affect them. If this is a rename, we iterate
414 * over all children regardless, since we need them unmounted in
415 * order to do the rename. Also, if this is a volume and we're doing
416 * a rename, then always add it to the changelist.
419 if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) &&
420 zfs_prop_get(zhp, clp->cl_prop, property,
421 sizeof (property), &sourcetype, where, sizeof (where),
428 * If we are "watching" sharenfs or sharesmb
429 * then check out the companion property which is tracked
432 if (clp->cl_shareprop != ZPROP_INVAL &&
433 zfs_prop_get(zhp, clp->cl_shareprop, property,
434 sizeof (property), &share_sourcetype, where, sizeof (where),
440 if (clp->cl_alldependents || clp->cl_allchildren ||
441 sourcetype == ZPROP_SRC_DEFAULT ||
442 sourcetype == ZPROP_SRC_INHERITED ||
443 (clp->cl_shareprop != ZPROP_INVAL &&
444 (share_sourcetype == ZPROP_SRC_DEFAULT ||
445 share_sourcetype == ZPROP_SRC_INHERITED))) {
446 if ((cn = zfs_alloc(zfs_get_handle(zhp),
447 sizeof (prop_changenode_t))) == NULL) {
453 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
454 zfs_is_mounted(zhp, NULL);
455 cn->cn_shared = zfs_is_shared(zhp);
456 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
457 cn->cn_needpost = B_TRUE;
459 /* Indicate if any child is exported to a local zone. */
460 if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
461 clp->cl_haszonedchild = B_TRUE;
463 uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
465 if (clp->cl_sorted) {
468 (void) uu_list_find(clp->cl_list, cn, NULL,
470 uu_list_insert(clp->cl_list, cn, idx);
473 * Add this child to beginning of the list. Children
474 * below this one in the hierarchy will get added above
475 * this one in the list. This produces a list in
476 * reverse dataset name order.
477 * This is necessary when the original mountpoint
480 ASSERT(!clp->cl_alldependents);
481 verify(uu_list_insert_before(clp->cl_list,
482 uu_list_first(clp->cl_list), cn) == 0);
485 if (!clp->cl_alldependents)
486 return (zfs_iter_children(zhp, change_one, data));
496 compare_mountpoints(const void *a, const void *b, void *unused)
498 const prop_changenode_t *ca = a;
499 const prop_changenode_t *cb = b;
501 char mounta[MAXPATHLEN];
502 char mountb[MAXPATHLEN];
504 boolean_t hasmounta, hasmountb;
507 * When unsharing or unmounting filesystems, we need to do it in
508 * mountpoint order. This allows the user to have a mountpoint
509 * hierarchy that is different from the dataset hierarchy, and still
510 * allow it to be changed. However, if either dataset doesn't have a
511 * mountpoint (because it is a volume or a snapshot), we place it at the
512 * end of the list, because it doesn't affect our change at all.
514 hasmounta = (zfs_prop_get(ca->cn_handle, ZFS_PROP_MOUNTPOINT, mounta,
515 sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
516 hasmountb = (zfs_prop_get(cb->cn_handle, ZFS_PROP_MOUNTPOINT, mountb,
517 sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
519 if (!hasmounta && hasmountb)
521 else if (hasmounta && !hasmountb)
523 else if (!hasmounta && !hasmountb)
526 return (strcmp(mountb, mounta));
530 * Given a ZFS handle and a property, construct a complete list of datasets
531 * that need to be modified as part of this process. For anything but the
532 * 'mountpoint' and 'sharenfs' properties, this just returns an empty list.
533 * Otherwise, we iterate over all children and look for any datasets that
534 * inherit the property. For each such dataset, we add it to the list and
535 * mark whether it was shared beforehand.
538 changelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int gather_flags,
541 prop_changelist_t *clp;
542 prop_changenode_t *cn;
544 char property[ZFS_MAXPROPLEN];
545 uu_compare_fn_t *compare = NULL;
546 boolean_t legacy = B_FALSE;
548 if ((clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t))) == NULL)
552 * For mountpoint-related tasks, we want to sort everything by
553 * mountpoint, so that we mount and unmount them in the appropriate
554 * order, regardless of their position in the hierarchy.
556 if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED ||
557 prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS ||
558 prop == ZFS_PROP_SHARESMB) {
560 if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
561 property, sizeof (property),
562 NULL, NULL, 0, B_FALSE) == 0 &&
563 (strcmp(property, "legacy") == 0 ||
564 strcmp(property, "none") == 0)) {
569 compare = compare_mountpoints;
570 clp->cl_sorted = B_TRUE;
574 clp->cl_pool = uu_list_pool_create("changelist_pool",
575 sizeof (prop_changenode_t),
576 offsetof(prop_changenode_t, cn_listnode),
578 if (clp->cl_pool == NULL) {
579 assert(uu_error() == UU_ERROR_NO_MEMORY);
580 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
581 changelist_free(clp);
585 clp->cl_list = uu_list_create(clp->cl_pool, NULL,
586 clp->cl_sorted ? UU_LIST_SORTED : 0);
587 clp->cl_gflags = gather_flags;
588 clp->cl_mflags = mnt_flags;
590 if (clp->cl_list == NULL) {
591 assert(uu_error() == UU_ERROR_NO_MEMORY);
592 (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
593 changelist_free(clp);
598 * If this is a rename or the 'zoned' property, we pretend we're
599 * changing the mountpoint and flag it so we can catch all children in
602 * Flag cl_alldependents to catch all children plus the dependents
603 * (clones) that are not in the hierarchy.
605 if (prop == ZFS_PROP_NAME) {
606 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
607 clp->cl_alldependents = B_TRUE;
608 } else if (prop == ZFS_PROP_ZONED) {
609 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
610 clp->cl_allchildren = B_TRUE;
611 } else if (prop == ZFS_PROP_CANMOUNT) {
612 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
613 } else if (prop == ZFS_PROP_VOLSIZE) {
614 clp->cl_prop = ZFS_PROP_MOUNTPOINT;
618 clp->cl_realprop = prop;
620 if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
621 clp->cl_prop != ZFS_PROP_SHARENFS &&
622 clp->cl_prop != ZFS_PROP_SHARESMB)
626 * If watching SHARENFS or SHARESMB then
627 * also watch its companion property.
629 if (clp->cl_prop == ZFS_PROP_SHARENFS)
630 clp->cl_shareprop = ZFS_PROP_SHARESMB;
631 else if (clp->cl_prop == ZFS_PROP_SHARESMB)
632 clp->cl_shareprop = ZFS_PROP_SHARENFS;
634 if (clp->cl_alldependents) {
635 if (zfs_iter_dependents(zhp, B_TRUE, change_one, clp) != 0) {
636 changelist_free(clp);
639 } else if (zfs_iter_children(zhp, change_one, clp) != 0) {
640 changelist_free(clp);
645 * We have to re-open ourselves because we auto-close all the handles
646 * and can't tell the difference.
648 if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp),
649 ZFS_TYPE_DATASET)) == NULL) {
650 changelist_free(clp);
655 * Always add ourself to the list. We add ourselves to the end so that
656 * we're the last to be unmounted.
658 if ((cn = zfs_alloc(zhp->zfs_hdl,
659 sizeof (prop_changenode_t))) == NULL) {
661 changelist_free(clp);
665 cn->cn_handle = temp;
666 cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
667 zfs_is_mounted(temp, NULL);
668 cn->cn_shared = zfs_is_shared(temp);
669 cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
670 cn->cn_needpost = B_TRUE;
672 uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
673 if (clp->cl_sorted) {
675 (void) uu_list_find(clp->cl_list, cn, NULL, &idx);
676 uu_list_insert(clp->cl_list, cn, idx);
679 * Add the target dataset to the end of the list.
680 * The list is not really unsorted. The list will be
681 * in reverse dataset name order. This is necessary
682 * when the original mountpoint is legacy or none.
684 verify(uu_list_insert_after(clp->cl_list,
685 uu_list_last(clp->cl_list), cn) == 0);
689 * If the mountpoint property was previously 'legacy', or 'none',
690 * record it as the behavior of changelist_postfix() will be different.
692 if ((clp->cl_prop == ZFS_PROP_MOUNTPOINT) && legacy) {
694 * do not automatically mount ex-legacy datasets if
695 * we specifically set canmount to noauto
697 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) !=
699 clp->cl_waslegacy = B_TRUE;