2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2017 Kyle J. Kneitinger <kyle@kneit.in>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/mount.h>
35 #include <sys/ucred.h>
39 #include <libzfs_core.h>
49 static int be_create_child_noent(libbe_handle_t *lbh, const char *active,
50 const char *child_path);
51 static int be_create_child_cloned(libbe_handle_t *lbh, const char *active);
55 * Iterator function for locating the rootfs amongst the children of the
56 * zfs_be_root set by loader(8). data is expected to be a libbe_handle_t *.
59 be_locate_rootfs(libbe_handle_t *lbh)
62 struct extmnttab entry;
66 * Check first if root is ZFS; if not, we'll bail on rootfs capture.
67 * Unfortunately needed because zfs_path_to_zhandle will emit to
68 * stderr if / isn't actually a ZFS filesystem, which we'd like
71 if (statfs("/", &sfs) == 0) {
72 statfs2mnttab(&sfs, &entry);
73 if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
77 zfs = zfs_path_to_zhandle(lbh->lzh, "/", ZFS_TYPE_FILESYSTEM);
81 strlcpy(lbh->rootfs, zfs_get_name(zfs), sizeof(lbh->rootfs));
87 * Initializes the libbe context to operate in the root boot environment
88 * dataset, for example, zroot/ROOT.
91 libbe_init(const char *root)
98 poolname = pos = NULL;
100 if ((lbh = calloc(1, sizeof(libbe_handle_t))) == NULL)
103 if ((lbh->lzh = libzfs_init()) == NULL)
107 * Grab rootfs, we'll work backwards from there if an optional BE root
108 * has not been passed in.
110 if (be_locate_rootfs(lbh) != 0) {
116 /* Strip off the final slash from rootfs to get the be root */
117 strlcpy(lbh->root, lbh->rootfs, sizeof(lbh->root));
118 pos = strrchr(lbh->root, '/');
123 strlcpy(lbh->root, root, sizeof(lbh->root));
125 if ((pos = strchr(lbh->root, '/')) == NULL)
128 pnamelen = pos - lbh->root;
129 poolname = malloc(pnamelen + 1);
130 if (poolname == NULL)
133 strlcpy(poolname, lbh->root, pnamelen + 1);
134 if ((lbh->active_phandle = zpool_open(lbh->lzh, poolname)) == NULL)
139 if (zpool_get_prop(lbh->active_phandle, ZPOOL_PROP_BOOTFS, lbh->bootfs,
140 sizeof(lbh->bootfs), NULL, true) != 0)
146 if (lbh->active_phandle != NULL)
147 zpool_close(lbh->active_phandle);
148 if (lbh->lzh != NULL)
149 libzfs_fini(lbh->lzh);
158 * Free memory allocated by libbe_init()
161 libbe_close(libbe_handle_t *lbh)
164 if (lbh->active_phandle != NULL)
165 zpool_close(lbh->active_phandle);
166 libzfs_fini(lbh->lzh);
171 * Proxy through to libzfs for the moment.
174 be_nicenum(uint64_t num, char *buf, size_t buflen)
177 zfs_nicenum(num, buf, buflen);
181 be_destroy_cb(zfs_handle_t *zfs_hdl, void *data)
185 if ((err = zfs_iter_children(zfs_hdl, be_destroy_cb, data)) != 0)
187 if ((err = zfs_destroy(zfs_hdl, false)) != 0)
193 * Destroy the boot environment or snapshot specified by the name
194 * parameter. Options are or'd together with the possible values:
195 * BE_DESTROY_FORCE : forces operation on mounted datasets
198 be_destroy(libbe_handle_t *lbh, const char *name, int options)
201 char path[BE_MAXPATHLEN];
203 int err, force, mounted;
206 force = options & BE_DESTROY_FORCE;
208 be_root_concat(lbh, name, path);
210 if (strchr(name, '@') == NULL) {
211 if (!zfs_dataset_exists(lbh->lzh, path, ZFS_TYPE_FILESYSTEM))
212 return (set_error(lbh, BE_ERR_NOENT));
214 if (strcmp(path, lbh->rootfs) == 0)
215 return (set_error(lbh, BE_ERR_DESTROYACT));
217 fs = zfs_open(lbh->lzh, p, ZFS_TYPE_FILESYSTEM);
220 if (!zfs_dataset_exists(lbh->lzh, path, ZFS_TYPE_SNAPSHOT))
221 return (set_error(lbh, BE_ERR_NOENT));
223 fs = zfs_open(lbh->lzh, p, ZFS_TYPE_SNAPSHOT);
227 return (set_error(lbh, BE_ERR_ZFSOPEN));
229 /* Check if mounted, unmount if force is specified */
230 if ((mounted = zfs_is_mounted(fs, NULL)) != 0) {
232 zfs_unmount(fs, NULL, 0);
234 return (set_error(lbh, BE_ERR_DESTROYMNT));
237 if ((err = be_destroy_cb(fs, NULL)) != 0) {
238 /* Children are still present or the mount is referenced */
240 return (set_error(lbh, BE_ERR_DESTROYMNT));
241 return (set_error(lbh, BE_ERR_UNKNOWN));
249 be_snapshot(libbe_handle_t *lbh, const char *source, const char *snap_name,
250 bool recursive, char *result)
252 char buf[BE_MAXPATHLEN];
256 be_root_concat(lbh, source, buf);
258 if ((err = be_exists(lbh, buf)) != 0)
259 return (set_error(lbh, err));
261 if (snap_name != NULL) {
262 if (strlcat(buf, "@", sizeof(buf)) >= sizeof(buf))
263 return (set_error(lbh, BE_ERR_INVALIDNAME));
265 if (strlcat(buf, snap_name, sizeof(buf)) >= sizeof(buf))
266 return (set_error(lbh, BE_ERR_INVALIDNAME));
269 snprintf(result, BE_MAXPATHLEN, "%s@%s", source,
274 strftime(buf + len, sizeof(buf) - len,
275 "@%F-%T", localtime(&rawtime));
276 if (result != NULL && strlcpy(result, strrchr(buf, '/') + 1,
277 sizeof(buf)) >= sizeof(buf))
278 return (set_error(lbh, BE_ERR_INVALIDNAME));
281 if ((err = zfs_snapshot(lbh->lzh, buf, recursive, NULL)) != 0) {
283 case EZFS_INVALIDNAME:
284 return (set_error(lbh, BE_ERR_INVALIDNAME));
288 * The other errors that zfs_ioc_snapshot might return
289 * shouldn't happen if we've set things up properly, so
290 * we'll gloss over them and call it UNKNOWN as it will
291 * require further triage.
293 if (errno == ENOTSUP)
294 return (set_error(lbh, BE_ERR_NOPOOL));
295 return (set_error(lbh, BE_ERR_UNKNOWN));
299 return (BE_ERR_SUCCESS);
304 * Create the boot environment specified by the name parameter
307 be_create(libbe_handle_t *lbh, const char *name)
311 err = be_create_from_existing(lbh, name, be_active_path(lbh));
313 return (set_error(lbh, err));
318 be_deep_clone_prop(int prop, void *cb)
321 struct libbe_dccb *dccb;
323 char pval[BE_MAXPATHLEN];
324 char source[BE_MAXPATHLEN];
328 /* Skip some properties we don't want to touch */
329 if (prop == ZFS_PROP_CANMOUNT)
332 /* Don't copy readonly properties */
333 if (zfs_prop_readonly(prop))
336 if ((err = zfs_prop_get(dccb->zhp, prop, (char *)&pval,
337 sizeof(pval), &src, (char *)&source, sizeof(source), false)))
338 /* Just continue if we fail to read a property */
341 /* Only copy locally defined properties */
342 if (src != ZPROP_SRC_LOCAL)
345 /* Augment mountpoint with altroot, if needed */
347 if (prop == ZFS_PROP_MOUNTPOINT && *dccb->altroot != '\0') {
348 if (pval[strlen(dccb->altroot)] == '\0')
349 strlcpy(pval, "/", sizeof(pval));
351 val = pval + strlen(dccb->altroot);
353 nvlist_add_string(dccb->props, zfs_prop_to_name(prop), val);
359 be_deep_clone(zfs_handle_t *ds, void *data)
362 char be_path[BE_MAXPATHLEN];
363 char snap_path[BE_MAXPATHLEN];
366 zfs_handle_t *snap_hdl;
368 struct libbe_deep_clone *isdc, sdc;
369 struct libbe_dccb dccb;
371 isdc = (struct libbe_deep_clone *)data;
372 dspath = zfs_get_name(ds);
373 if ((dsname = strrchr(dspath, '/')) == NULL)
374 return (BE_ERR_UNKNOWN);
377 if (isdc->bename == NULL)
378 snprintf(be_path, sizeof(be_path), "%s/%s", isdc->be_root, dsname);
380 snprintf(be_path, sizeof(be_path), "%s/%s", isdc->be_root, isdc->bename);
382 snprintf(snap_path, sizeof(snap_path), "%s@%s", dspath, isdc->snapname);
384 if (zfs_dataset_exists(isdc->lbh->lzh, be_path, ZFS_TYPE_DATASET))
385 return (set_error(isdc->lbh, BE_ERR_EXISTS));
388 zfs_open(isdc->lbh->lzh, snap_path, ZFS_TYPE_SNAPSHOT)) == NULL)
389 return (set_error(isdc->lbh, BE_ERR_ZFSOPEN));
391 nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
392 nvlist_add_string(props, "canmount", "noauto");
396 if (zpool_get_prop(isdc->lbh->active_phandle, ZPOOL_PROP_ALTROOT,
397 dccb.altroot, sizeof(dccb.altroot), NULL, true) != 0 ||
398 strcmp(dccb.altroot, "-") == 0)
399 *dccb.altroot = '\0';
400 if (zprop_iter(be_deep_clone_prop, &dccb, B_FALSE, B_FALSE,
401 ZFS_TYPE_FILESYSTEM) == ZPROP_INVAL)
404 if ((err = zfs_clone(snap_hdl, be_path, props)) != 0)
405 err = BE_ERR_ZFSCLONE;
410 /* Failed to clone */
411 if (err != BE_ERR_SUCCESS)
412 return (set_error(isdc->lbh, err));
416 sdc.snapname = isdc->snapname;
417 sdc.be_root = (char *)&be_path;
419 err = zfs_iter_filesystems(ds, be_deep_clone, &sdc);
425 * Create the boot environment from pre-existing snapshot
428 be_create_from_existing_snap(libbe_handle_t *lbh, const char *name,
432 char be_path[BE_MAXPATHLEN];
433 char snap_path[BE_MAXPATHLEN];
435 char *parentname, *snapname;
436 zfs_handle_t *parent_hdl;
437 struct libbe_deep_clone sdc;
439 if ((err = be_validate_name(lbh, name)) != 0)
440 return (set_error(lbh, err));
441 if ((err = be_root_concat(lbh, snap, snap_path)) != 0)
442 return (set_error(lbh, err));
443 if ((err = be_validate_snap(lbh, snap_path)) != 0)
444 return (set_error(lbh, err));
446 if ((err = be_root_concat(lbh, name, be_path)) != 0)
447 return (set_error(lbh, err));
449 if ((bename = strrchr(name, '/')) == NULL)
454 if ((parentname = strdup(snap_path)) == NULL)
455 return (set_error(lbh, BE_ERR_UNKNOWN));
457 snapname = strchr(parentname, '@');
458 if (snapname == NULL) {
460 return (set_error(lbh, BE_ERR_UNKNOWN));
467 sdc.snapname = snapname;
468 sdc.be_root = lbh->root;
470 parent_hdl = zfs_open(lbh->lzh, parentname, ZFS_TYPE_DATASET);
471 err = be_deep_clone(parent_hdl, &sdc);
474 return (set_error(lbh, err));
479 * Create a boot environment from an existing boot environment
482 be_create_from_existing(libbe_handle_t *lbh, const char *name, const char *old)
485 char buf[BE_MAXPATHLEN];
487 if ((err = be_snapshot(lbh, old, NULL, true, (char *)&buf)) != 0)
488 return (set_error(lbh, err));
490 err = be_create_from_existing_snap(lbh, name, (char *)buf);
492 return (set_error(lbh, err));
497 * Verifies that a snapshot has a valid name, exists, and has a mountpoint of
498 * '/'. Returns BE_ERR_SUCCESS (0), upon success, or the relevant BE_ERR_* upon
499 * failure. Does not set the internal library error state.
502 be_validate_snap(libbe_handle_t *lbh, const char *snap_name)
505 if (strlen(snap_name) >= BE_MAXPATHLEN)
506 return (BE_ERR_PATHLEN);
508 if (!zfs_dataset_exists(lbh->lzh, snap_name,
510 return (BE_ERR_NOENT);
512 return (BE_ERR_SUCCESS);
517 * Idempotently appends the name argument to the root boot environment path
518 * and copies the resulting string into the result buffer (which is assumed
519 * to be at least BE_MAXPATHLEN characters long. Returns BE_ERR_SUCCESS upon
520 * success, BE_ERR_PATHLEN if the resulting path is longer than BE_MAXPATHLEN,
521 * or BE_ERR_INVALIDNAME if the name is a path that does not begin with
522 * zfs_be_root. Does not set internal library error state.
525 be_root_concat(libbe_handle_t *lbh, const char *name, char *result)
527 size_t name_len, root_len;
529 name_len = strlen(name);
530 root_len = strlen(lbh->root);
532 /* Act idempotently; return be name if it is already a full path */
533 if (strrchr(name, '/') != NULL) {
534 if (strstr(name, lbh->root) != name)
535 return (BE_ERR_INVALIDNAME);
537 if (name_len >= BE_MAXPATHLEN)
538 return (BE_ERR_PATHLEN);
540 strlcpy(result, name, BE_MAXPATHLEN);
541 return (BE_ERR_SUCCESS);
542 } else if (name_len + root_len + 1 < BE_MAXPATHLEN) {
543 snprintf(result, BE_MAXPATHLEN, "%s/%s", lbh->root,
545 return (BE_ERR_SUCCESS);
548 return (BE_ERR_PATHLEN);
553 * Verifies the validity of a boot environment name (A-Za-z0-9-_.). Returns
554 * BE_ERR_SUCCESS (0) if name is valid, otherwise returns BE_ERR_INVALIDNAME
556 * Does not set internal library error state.
559 be_validate_name(libbe_handle_t *lbh, const char *name)
561 for (int i = 0; *name; i++) {
563 if (isalnum(c) || (c == '-') || (c == '_') || (c == '.'))
565 return (BE_ERR_INVALIDNAME);
569 * Impose the additional restriction that the entire dataset name must
570 * not exceed the maximum length of a dataset, i.e. MAXNAMELEN.
572 if (strlen(lbh->root) + 1 + strlen(name) > MAXNAMELEN)
573 return (BE_ERR_PATHLEN);
574 return (BE_ERR_SUCCESS);
582 be_rename(libbe_handle_t *lbh, const char *old, const char *new)
584 char full_old[BE_MAXPATHLEN];
585 char full_new[BE_MAXPATHLEN];
586 zfs_handle_t *zfs_hdl;
590 * be_validate_name is documented not to set error state, so we should
593 if ((err = be_validate_name(lbh, new)) != 0)
594 return (set_error(lbh, err));
595 if ((err = be_root_concat(lbh, old, full_old)) != 0)
596 return (set_error(lbh, err));
597 if ((err = be_root_concat(lbh, new, full_new)) != 0)
598 return (set_error(lbh, err));
600 if (!zfs_dataset_exists(lbh->lzh, full_old, ZFS_TYPE_DATASET))
601 return (set_error(lbh, BE_ERR_NOENT));
603 if (zfs_dataset_exists(lbh->lzh, full_new, ZFS_TYPE_DATASET))
604 return (set_error(lbh, BE_ERR_EXISTS));
606 if ((zfs_hdl = zfs_open(lbh->lzh, full_old,
607 ZFS_TYPE_FILESYSTEM)) == NULL)
608 return (set_error(lbh, BE_ERR_ZFSOPEN));
610 /* recurse, nounmount, forceunmount */
611 struct renameflags flags = {
615 err = zfs_rename(zfs_hdl, NULL, full_new, flags);
619 return (set_error(lbh, BE_ERR_UNKNOWN));
625 be_export(libbe_handle_t *lbh, const char *bootenv, int fd)
627 char snap_name[BE_MAXPATHLEN];
628 char buf[BE_MAXPATHLEN];
632 if ((err = be_snapshot(lbh, bootenv, NULL, true, snap_name)) != 0)
633 /* Use the error set by be_snapshot */
636 be_root_concat(lbh, snap_name, buf);
638 if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_DATASET)) == NULL)
639 return (set_error(lbh, BE_ERR_ZFSOPEN));
641 err = zfs_send_one(zfs, NULL, fd, 0);
649 be_import(libbe_handle_t *lbh, const char *bootenv, int fd)
651 char buf[BE_MAXPATHLEN];
659 * We don't need this to be incredibly random, just unique enough that
660 * it won't conflict with an existing dataset name. Chopping time
661 * down to 32 bits is probably good enough for this.
663 snprintf(nbuf, 24, "tmp%u",
664 (uint32_t)(time(NULL) & 0xFFFFFFFF));
665 if ((err = be_root_concat(lbh, nbuf, buf)) != 0)
667 * Technically this is our problem, but we try to use short
668 * enough names that we won't run into problems except in
669 * worst-case BE root approaching MAXPATHLEN.
671 return (set_error(lbh, BE_ERR_PATHLEN));
675 strftime(buf + len, sizeof(buf) - len, "@%F-%T", localtime(&rawtime));
677 if ((err = lzc_receive(buf, NULL, NULL, false, fd)) != 0) {
680 return (set_error(lbh, BE_ERR_NOORIGIN));
682 return (set_error(lbh, BE_ERR_NOENT));
684 return (set_error(lbh, BE_ERR_IO));
686 return (set_error(lbh, BE_ERR_UNKNOWN));
690 if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_SNAPSHOT)) == NULL)
691 return (set_error(lbh, BE_ERR_ZFSOPEN));
693 nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
694 nvlist_add_string(props, "canmount", "noauto");
695 nvlist_add_string(props, "mountpoint", "/");
697 be_root_concat(lbh, bootenv, buf);
699 err = zfs_clone(zfs, buf, props);
704 return (set_error(lbh, BE_ERR_UNKNOWN));
707 * Finally, we open up the dataset we just cloned the snapshot so that
708 * we may promote it. This is necessary in order to clean up the ghost
709 * snapshot that doesn't need to be seen after the operation is
712 if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_DATASET)) == NULL)
713 return (set_error(lbh, BE_ERR_ZFSOPEN));
715 err = zfs_promote(zfs);
719 return (set_error(lbh, BE_ERR_UNKNOWN));
721 /* Clean up the temporary snapshot */
722 return (be_destroy(lbh, nbuf, 0));
727 be_create_child_noent(libbe_handle_t *lbh, const char *active,
728 const char *child_path)
734 nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
735 nvlist_add_string(props, "canmount", "noauto");
736 nvlist_add_string(props, "mountpoint", child_path);
739 if ((err = zfs_create(lbh->lzh, active, ZFS_TYPE_DATASET,
743 return (set_error(lbh, BE_ERR_EXISTS));
745 return (set_error(lbh, BE_ERR_NOENT));
747 case EZFS_BADVERSION:
748 return (set_error(lbh, BE_ERR_NOPOOL));
751 /* We set something up wrong, probably... */
752 return (set_error(lbh, BE_ERR_UNKNOWN));
757 if ((zfs = zfs_open(lbh->lzh, active, ZFS_TYPE_DATASET)) == NULL)
758 return (set_error(lbh, BE_ERR_ZFSOPEN));
761 if ((err = zfs_prop_set(zfs, "canmount", "noauto")) != 0) {
764 * Similar to other cases, this shouldn't fail unless we've
765 * done something wrong. This is a new dataset that shouldn't
766 * have been mounted anywhere between creation and now.
768 if (err == EZFS_NOMEM)
769 return (set_error(lbh, BE_ERR_NOMEM));
770 return (set_error(lbh, BE_ERR_UNKNOWN));
773 return (BE_ERR_SUCCESS);
777 be_create_child_cloned(libbe_handle_t *lbh, const char *active)
779 char buf[BE_MAXPATHLEN], tmp[BE_MAXPATHLEN];;
786 * Establish if the existing path is a zfs dataset or just
787 * the subdirectory of one
789 strlcpy(tmp, "tmp/be_snap.XXXXX", sizeof(tmp));
790 if (mktemp(tmp) == NULL)
791 return (set_error(lbh, BE_ERR_UNKNOWN));
793 be_root_concat(lbh, tmp, buf);
794 printf("Here %s?\n", buf);
795 if ((err = zfs_snapshot(lbh->lzh, buf, false, NULL)) != 0) {
797 case EZFS_INVALIDNAME:
798 return (set_error(lbh, BE_ERR_INVALIDNAME));
802 * The other errors that zfs_ioc_snapshot might return
803 * shouldn't happen if we've set things up properly, so
804 * we'll gloss over them and call it UNKNOWN as it will
805 * require further triage.
807 if (errno == ENOTSUP)
808 return (set_error(lbh, BE_ERR_NOPOOL));
809 return (set_error(lbh, BE_ERR_UNKNOWN));
814 if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_SNAPSHOT)) == NULL)
815 return (BE_ERR_ZFSOPEN);
817 if ((err = zfs_clone(zfs, active, NULL)) != 0)
818 /* XXX TODO correct error */
819 return (set_error(lbh, BE_ERR_UNKNOWN));
823 return (BE_ERR_SUCCESS);
827 be_add_child(libbe_handle_t *lbh, const char *child_path, bool cp_if_exists)
830 char active[BE_MAXPATHLEN], buf[BE_MAXPATHLEN];
834 /* Require absolute paths */
835 if (*child_path != '/')
836 return (set_error(lbh, BE_ERR_BADPATH));
838 strlcpy(active, be_active_path(lbh), BE_MAXPATHLEN);
841 /* Create non-mountable parent dataset(s) */
843 for (char *p; (p = strchr(s+1, '/')) != NULL; s = p) {
845 strncat(buf, s, len);
847 nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
848 nvlist_add_string(props, "canmount", "off");
849 nvlist_add_string(props, "mountpoint", "none");
850 zfs_create(lbh->lzh, buf, ZFS_TYPE_DATASET, props);
854 /* Path does not exist as a descendent of / yet */
855 if (strlcat(active, child_path, BE_MAXPATHLEN) >= BE_MAXPATHLEN)
856 return (set_error(lbh, BE_ERR_PATHLEN));
858 if (stat(child_path, &sb) != 0) {
859 /* Verify that error is ENOENT */
861 return (set_error(lbh, BE_ERR_UNKNOWN));
862 return (be_create_child_noent(lbh, active, child_path));
863 } else if (cp_if_exists)
864 /* Path is already a descendent of / and should be copied */
865 return (be_create_child_cloned(lbh, active));
866 return (set_error(lbh, BE_ERR_EXISTS));
871 be_set_nextboot(libbe_handle_t *lbh, nvlist_t *config, uint64_t pool_guid,
878 if (nvlist_lookup_nvlist_array(config, ZPOOL_CONFIG_CHILDREN, &child,
880 for (c = 0; c < children; ++c)
881 if (be_set_nextboot(lbh, child[c], pool_guid, zfsdev) != 0)
886 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID,
891 if (zpool_nextboot(lbh->lzh, pool_guid, vdev_guid, zfsdev) != 0) {
892 perror("ZFS_IOC_NEXTBOOT failed");
900 * Deactivate old BE dataset; currently just sets canmount=noauto
903 be_deactivate(libbe_handle_t *lbh, const char *ds)
907 if ((zfs = zfs_open(lbh->lzh, ds, ZFS_TYPE_DATASET)) == NULL)
909 if (zfs_prop_set(zfs, "canmount", "noauto") != 0)
916 be_activate(libbe_handle_t *lbh, const char *bootenv, bool temporary)
918 char be_path[BE_MAXPATHLEN];
919 char buf[BE_MAXPATHLEN];
920 nvlist_t *config, *dsprops, *vdevs;
926 be_root_concat(lbh, bootenv, be_path);
928 /* Note: be_exists fails if mountpoint is not / */
929 if ((err = be_exists(lbh, be_path)) != 0)
930 return (set_error(lbh, err));
933 config = zpool_get_config(lbh->active_phandle, NULL);
935 /* config should be fetchable... */
936 return (set_error(lbh, BE_ERR_UNKNOWN));
938 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID,
940 /* Similarly, it shouldn't be possible */
941 return (set_error(lbh, BE_ERR_UNKNOWN));
943 /* Expected format according to zfsbootcfg(8) man */
944 snprintf(buf, sizeof(buf), "zfs:%s:", be_path);
946 /* We have no config tree */
947 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
949 return (set_error(lbh, BE_ERR_NOPOOL));
951 return (be_set_nextboot(lbh, vdevs, pool_guid, buf));
953 if (be_deactivate(lbh, lbh->bootfs) != 0)
956 /* Obtain bootenv zpool */
957 err = zpool_set_prop(lbh->active_phandle, "bootfs", be_path);
961 zhp = zfs_open(lbh->lzh, be_path, ZFS_TYPE_FILESYSTEM);
965 if (be_prop_list_alloc(&dsprops) != 0)
968 if (be_get_dataset_props(lbh, be_path, dsprops) != 0) {
969 nvlist_free(dsprops);
973 if (nvlist_lookup_string(dsprops, "origin", &origin) == 0)
974 err = zfs_promote(zhp);
975 nvlist_free(dsprops);
983 return (BE_ERR_SUCCESS);