Index: head/lib/libbe/be.c =================================================================== --- head/lib/libbe/be.c (revision 355459) +++ head/lib/libbe/be.c (revision 355460) @@ -1,1132 +1,1135 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2017 Kyle J. Kneitinger * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include +#include +#include + #include #include #include #include #include #include #include #include "be.h" #include "be_impl.h" struct be_destroy_data { libbe_handle_t *lbh; char *snapname; }; #if SOON static int be_create_child_noent(libbe_handle_t *lbh, const char *active, const char *child_path); static int be_create_child_cloned(libbe_handle_t *lbh, const char *active); #endif /* Arbitrary... should tune */ #define BE_SNAP_SERIAL_MAX 1024 /* * Iterator function for locating the rootfs amongst the children of the * zfs_be_root set by loader(8). data is expected to be a libbe_handle_t *. */ static int be_locate_rootfs(libbe_handle_t *lbh) { struct statfs sfs; - struct extmnttab entry; + struct mnttab entry; zfs_handle_t *zfs; /* * Check first if root is ZFS; if not, we'll bail on rootfs capture. * Unfortunately needed because zfs_path_to_zhandle will emit to * stderr if / isn't actually a ZFS filesystem, which we'd like * to avoid. */ if (statfs("/", &sfs) == 0) { statfs2mnttab(&sfs, &entry); if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0) return (1); } else return (1); zfs = zfs_path_to_zhandle(lbh->lzh, "/", ZFS_TYPE_FILESYSTEM); if (zfs == NULL) return (1); strlcpy(lbh->rootfs, zfs_get_name(zfs), sizeof(lbh->rootfs)); zfs_close(zfs); return (0); } /* * Initializes the libbe context to operate in the root boot environment * dataset, for example, zroot/ROOT. */ libbe_handle_t * libbe_init(const char *root) { char altroot[MAXPATHLEN]; libbe_handle_t *lbh; char *poolname, *pos; int pnamelen; lbh = NULL; poolname = pos = NULL; if ((lbh = calloc(1, sizeof(libbe_handle_t))) == NULL) goto err; if ((lbh->lzh = libzfs_init()) == NULL) goto err; /* * Grab rootfs, we'll work backwards from there if an optional BE root * has not been passed in. */ if (be_locate_rootfs(lbh) != 0) { if (root == NULL) goto err; *lbh->rootfs = '\0'; } if (root == NULL) { /* Strip off the final slash from rootfs to get the be root */ strlcpy(lbh->root, lbh->rootfs, sizeof(lbh->root)); pos = strrchr(lbh->root, '/'); if (pos == NULL) goto err; *pos = '\0'; } else strlcpy(lbh->root, root, sizeof(lbh->root)); if ((pos = strchr(lbh->root, '/')) == NULL) goto err; pnamelen = pos - lbh->root; poolname = malloc(pnamelen + 1); if (poolname == NULL) goto err; strlcpy(poolname, lbh->root, pnamelen + 1); if ((lbh->active_phandle = zpool_open(lbh->lzh, poolname)) == NULL) goto err; free(poolname); poolname = NULL; if (zpool_get_prop(lbh->active_phandle, ZPOOL_PROP_BOOTFS, lbh->bootfs, sizeof(lbh->bootfs), NULL, true) != 0) goto err; if (zpool_get_prop(lbh->active_phandle, ZPOOL_PROP_ALTROOT, altroot, sizeof(altroot), NULL, true) == 0 && strcmp(altroot, "-") != 0) lbh->altroot_len = strlen(altroot); return (lbh); err: if (lbh != NULL) { if (lbh->active_phandle != NULL) zpool_close(lbh->active_phandle); if (lbh->lzh != NULL) libzfs_fini(lbh->lzh); free(lbh); } free(poolname); return (NULL); } /* * Free memory allocated by libbe_init() */ void libbe_close(libbe_handle_t *lbh) { if (lbh->active_phandle != NULL) zpool_close(lbh->active_phandle); libzfs_fini(lbh->lzh); free(lbh); } /* * Proxy through to libzfs for the moment. */ void be_nicenum(uint64_t num, char *buf, size_t buflen) { zfs_nicenum(num, buf, buflen); } static int be_destroy_cb(zfs_handle_t *zfs_hdl, void *data) { char path[BE_MAXPATHLEN]; struct be_destroy_data *bdd; zfs_handle_t *snap; int err; bdd = (struct be_destroy_data *)data; if (bdd->snapname == NULL) { err = zfs_iter_children(zfs_hdl, be_destroy_cb, data); if (err != 0) return (err); return (zfs_destroy(zfs_hdl, false)); } /* If we're dealing with snapshots instead, delete that one alone */ err = zfs_iter_filesystems(zfs_hdl, be_destroy_cb, data); if (err != 0) return (err); /* * This part is intentionally glossing over any potential errors, * because there's a lot less potential for errors when we're cleaning * up snapshots rather than a full deep BE. The primary error case * here being if the snapshot doesn't exist in the first place, which * the caller will likely deem insignificant as long as it doesn't * exist after the call. Thus, such a missing snapshot shouldn't jam * up the destruction. */ snprintf(path, sizeof(path), "%s@%s", zfs_get_name(zfs_hdl), bdd->snapname); if (!zfs_dataset_exists(bdd->lbh->lzh, path, ZFS_TYPE_SNAPSHOT)) return (0); snap = zfs_open(bdd->lbh->lzh, path, ZFS_TYPE_SNAPSHOT); if (snap != NULL) zfs_destroy(snap, false); return (0); } #define BE_DESTROY_WANTORIGIN (BE_DESTROY_ORIGIN | BE_DESTROY_AUTOORIGIN) /* * Destroy the boot environment or snapshot specified by the name * parameter. Options are or'd together with the possible values: * BE_DESTROY_FORCE : forces operation on mounted datasets * BE_DESTROY_ORIGIN: destroy the origin snapshot as well */ int be_destroy(libbe_handle_t *lbh, const char *name, int options) { struct be_destroy_data bdd; char origin[BE_MAXPATHLEN], path[BE_MAXPATHLEN]; zfs_handle_t *fs; char *snapdelim; int err, force, mounted; size_t rootlen; bdd.lbh = lbh; bdd.snapname = NULL; force = options & BE_DESTROY_FORCE; *origin = '\0'; be_root_concat(lbh, name, path); if ((snapdelim = strchr(path, '@')) == NULL) { if (!zfs_dataset_exists(lbh->lzh, path, ZFS_TYPE_FILESYSTEM)) return (set_error(lbh, BE_ERR_NOENT)); if (strcmp(path, lbh->rootfs) == 0 || strcmp(path, lbh->bootfs) == 0) return (set_error(lbh, BE_ERR_DESTROYACT)); fs = zfs_open(lbh->lzh, path, ZFS_TYPE_FILESYSTEM); if (fs == NULL) return (set_error(lbh, BE_ERR_ZFSOPEN)); if ((options & BE_DESTROY_WANTORIGIN) != 0 && zfs_prop_get(fs, ZFS_PROP_ORIGIN, origin, sizeof(origin), NULL, NULL, 0, 1) != 0 && (options & BE_DESTROY_ORIGIN) != 0) return (set_error(lbh, BE_ERR_NOORIGIN)); /* * If the caller wants auto-origin destruction and the origin * name matches one of our automatically created snapshot names * (i.e. strftime("%F-%T") with a serial at the end), then * we'll set the DESTROY_ORIGIN flag and nuke it * be_is_auto_snapshot_name is exported from libbe(3) so that * the caller can determine if it needs to warn about the origin * not being destroyed or not. */ if ((options & BE_DESTROY_AUTOORIGIN) != 0 && *origin != '\0' && be_is_auto_snapshot_name(lbh, origin)) options |= BE_DESTROY_ORIGIN; /* Don't destroy a mounted dataset unless force is specified */ if ((mounted = zfs_is_mounted(fs, NULL)) != 0) { if (force) { zfs_unmount(fs, NULL, 0); } else { free(bdd.snapname); return (set_error(lbh, BE_ERR_DESTROYMNT)); } } } else { if (!zfs_dataset_exists(lbh->lzh, path, ZFS_TYPE_SNAPSHOT)) return (set_error(lbh, BE_ERR_NOENT)); bdd.snapname = strdup(snapdelim + 1); if (bdd.snapname == NULL) return (set_error(lbh, BE_ERR_NOMEM)); *snapdelim = '\0'; fs = zfs_open(lbh->lzh, path, ZFS_TYPE_DATASET); if (fs == NULL) { free(bdd.snapname); return (set_error(lbh, BE_ERR_ZFSOPEN)); } } err = be_destroy_cb(fs, &bdd); zfs_close(fs); free(bdd.snapname); if (err != 0) { /* Children are still present or the mount is referenced */ if (err == EBUSY) return (set_error(lbh, BE_ERR_DESTROYMNT)); return (set_error(lbh, BE_ERR_UNKNOWN)); } if ((options & BE_DESTROY_ORIGIN) == 0) return (0); /* The origin can't possibly be shorter than the BE root */ rootlen = strlen(lbh->root); if (*origin == '\0' || strlen(origin) <= rootlen + 1) return (set_error(lbh, BE_ERR_INVORIGIN)); /* * We'll be chopping off the BE root and running this back through * be_destroy, so that we properly handle the origin snapshot whether * it be that of a deep BE or not. */ if (strncmp(origin, lbh->root, rootlen) != 0 || origin[rootlen] != '/') return (0); return (be_destroy(lbh, origin + rootlen + 1, options & ~BE_DESTROY_ORIGIN)); } static void be_setup_snapshot_name(libbe_handle_t *lbh, char *buf, size_t buflen) { time_t rawtime; int len, serial; time(&rawtime); len = strlen(buf); len += strftime(buf + len, buflen - len, "@%F-%T", localtime(&rawtime)); /* No room for serial... caller will do its best */ if (buflen - len < 2) return; for (serial = 0; serial < BE_SNAP_SERIAL_MAX; ++serial) { snprintf(buf + len, buflen - len, "-%d", serial); if (!zfs_dataset_exists(lbh->lzh, buf, ZFS_TYPE_SNAPSHOT)) return; } } bool be_is_auto_snapshot_name(libbe_handle_t *lbh, const char *name) { const char *snap; int day, hour, minute, month, second, serial, year; if ((snap = strchr(name, '@')) == NULL) return (false); ++snap; /* We'll grab the individual components and do some light validation. */ if (sscanf(snap, "%d-%d-%d-%d:%d:%d-%d", &year, &month, &day, &hour, &minute, &second, &serial) != 7) return (false); return (year >= 1970) && (month >= 1 && month <= 12) && (day >= 1 && day <= 31) && (hour >= 0 && hour <= 23) && (minute >= 0 && minute <= 59) && (second >= 0 && second <= 60) && serial >= 0; } int be_snapshot(libbe_handle_t *lbh, const char *source, const char *snap_name, bool recursive, char *result) { char buf[BE_MAXPATHLEN]; int err; be_root_concat(lbh, source, buf); if ((err = be_exists(lbh, buf)) != 0) return (set_error(lbh, err)); if (snap_name != NULL) { if (strlcat(buf, "@", sizeof(buf)) >= sizeof(buf)) return (set_error(lbh, BE_ERR_INVALIDNAME)); if (strlcat(buf, snap_name, sizeof(buf)) >= sizeof(buf)) return (set_error(lbh, BE_ERR_INVALIDNAME)); if (result != NULL) snprintf(result, BE_MAXPATHLEN, "%s@%s", source, snap_name); } else { be_setup_snapshot_name(lbh, buf, sizeof(buf)); if (result != NULL && strlcpy(result, strrchr(buf, '/') + 1, sizeof(buf)) >= sizeof(buf)) return (set_error(lbh, BE_ERR_INVALIDNAME)); } if ((err = zfs_snapshot(lbh->lzh, buf, recursive, NULL)) != 0) { switch (err) { case EZFS_INVALIDNAME: return (set_error(lbh, BE_ERR_INVALIDNAME)); default: /* * The other errors that zfs_ioc_snapshot might return * shouldn't happen if we've set things up properly, so * we'll gloss over them and call it UNKNOWN as it will * require further triage. */ if (errno == ENOTSUP) return (set_error(lbh, BE_ERR_NOPOOL)); return (set_error(lbh, BE_ERR_UNKNOWN)); } } return (BE_ERR_SUCCESS); } /* * Create the boot environment specified by the name parameter */ int be_create(libbe_handle_t *lbh, const char *name) { int err; err = be_create_from_existing(lbh, name, be_active_path(lbh)); return (set_error(lbh, err)); } static int be_deep_clone_prop(int prop, void *cb) { int err; struct libbe_dccb *dccb; zprop_source_t src; char pval[BE_MAXPATHLEN]; char source[BE_MAXPATHLEN]; char *val; dccb = cb; /* Skip some properties we don't want to touch */ if (prop == ZFS_PROP_CANMOUNT) return (ZPROP_CONT); /* Don't copy readonly properties */ if (zfs_prop_readonly(prop)) return (ZPROP_CONT); if ((err = zfs_prop_get(dccb->zhp, prop, (char *)&pval, sizeof(pval), &src, (char *)&source, sizeof(source), false))) /* Just continue if we fail to read a property */ return (ZPROP_CONT); /* * Only copy locally defined or received properties. This continues * to avoid temporary/default/local properties intentionally without * breaking received datasets. */ if (src != ZPROP_SRC_LOCAL && src != ZPROP_SRC_RECEIVED) return (ZPROP_CONT); /* Augment mountpoint with altroot, if needed */ val = pval; if (prop == ZFS_PROP_MOUNTPOINT) val = be_mountpoint_augmented(dccb->lbh, val); nvlist_add_string(dccb->props, zfs_prop_to_name(prop), val); return (ZPROP_CONT); } /* * Return the corresponding boot environment path for a given * dataset path, the constructed path is placed in 'result'. * * example: say our new boot environment name is 'bootenv' and * the dataset path is 'zroot/ROOT/default/data/set'. * * result should produce: 'zroot/ROOT/bootenv/data/set' */ static int be_get_path(struct libbe_deep_clone *ldc, const char *dspath, char *result, int result_size) { char *pos; char *child_dataset; /* match the root path for the boot environments */ pos = strstr(dspath, ldc->lbh->root); /* no match, different pools? */ if (pos == NULL) return (BE_ERR_BADPATH); /* root path of the new boot environment */ snprintf(result, result_size, "%s/%s", ldc->lbh->root, ldc->bename); /* gets us to the parent dataset, the +1 consumes a trailing slash */ pos += strlen(ldc->lbh->root) + 1; /* skip the parent dataset */ if ((child_dataset = strchr(pos, '/')) != NULL) strlcat(result, child_dataset, result_size); return (BE_ERR_SUCCESS); } static int be_clone_cb(zfs_handle_t *ds, void *data) { int err; char be_path[BE_MAXPATHLEN]; char snap_path[BE_MAXPATHLEN]; const char *dspath; zfs_handle_t *snap_hdl; nvlist_t *props; struct libbe_deep_clone *ldc; struct libbe_dccb dccb; ldc = (struct libbe_deep_clone *)data; dspath = zfs_get_name(ds); snprintf(snap_path, sizeof(snap_path), "%s@%s", dspath, ldc->snapname); /* construct the boot environment path from the dataset we're cloning */ if (be_get_path(ldc, dspath, be_path, sizeof(be_path)) != BE_ERR_SUCCESS) return (set_error(ldc->lbh, BE_ERR_UNKNOWN)); /* the dataset to be created (i.e. the boot environment) already exists */ if (zfs_dataset_exists(ldc->lbh->lzh, be_path, ZFS_TYPE_DATASET)) return (set_error(ldc->lbh, BE_ERR_EXISTS)); /* no snapshot found for this dataset, silently skip it */ if (!zfs_dataset_exists(ldc->lbh->lzh, snap_path, ZFS_TYPE_SNAPSHOT)) return (0); if ((snap_hdl = zfs_open(ldc->lbh->lzh, snap_path, ZFS_TYPE_SNAPSHOT)) == NULL) return (set_error(ldc->lbh, BE_ERR_ZFSOPEN)); nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP); nvlist_add_string(props, "canmount", "noauto"); dccb.lbh = ldc->lbh; dccb.zhp = ds; dccb.props = props; if (zprop_iter(be_deep_clone_prop, &dccb, B_FALSE, B_FALSE, ZFS_TYPE_FILESYSTEM) == ZPROP_INVAL) return (-1); if ((err = zfs_clone(snap_hdl, be_path, props)) != 0) return (set_error(ldc->lbh, BE_ERR_ZFSCLONE)); nvlist_free(props); zfs_close(snap_hdl); if (ldc->depth_limit == -1 || ldc->depth < ldc->depth_limit) { ldc->depth++; err = zfs_iter_filesystems(ds, be_clone_cb, ldc); ldc->depth--; } return (set_error(ldc->lbh, err)); } /* * Create a boot environment with a given name from a given snapshot. * Snapshots can be in the format 'zroot/ROOT/default@snapshot' or * 'default@snapshot'. In the latter case, 'default@snapshot' will be prepended * with the root path that libbe was initailized with. */ static int be_clone(libbe_handle_t *lbh, const char *bename, const char *snapshot, int depth) { int err; char snap_path[BE_MAXPATHLEN]; char *parentname, *snapname; zfs_handle_t *parent_hdl; struct libbe_deep_clone ldc; /* ensure the boot environment name is valid */ if ((err = be_validate_name(lbh, bename)) != 0) return (set_error(lbh, err)); /* * prepend the boot environment root path if we're * given a partial snapshot name. */ if ((err = be_root_concat(lbh, snapshot, snap_path)) != 0) return (set_error(lbh, err)); /* ensure the snapshot exists */ if ((err = be_validate_snap(lbh, snap_path)) != 0) return (set_error(lbh, err)); /* get a copy of the snapshot path so we can disect it */ if ((parentname = strdup(snap_path)) == NULL) return (set_error(lbh, BE_ERR_UNKNOWN)); /* split dataset name from snapshot name */ snapname = strchr(parentname, '@'); if (snapname == NULL) { free(parentname); return (set_error(lbh, BE_ERR_UNKNOWN)); } *snapname = '\0'; snapname++; /* set-up the boot environment */ ldc.lbh = lbh; ldc.bename = bename; ldc.snapname = snapname; ldc.depth = 0; ldc.depth_limit = depth; /* the boot environment will be cloned from this dataset */ parent_hdl = zfs_open(lbh->lzh, parentname, ZFS_TYPE_DATASET); /* create the boot environment */ err = be_clone_cb(parent_hdl, &ldc); free(parentname); return (set_error(lbh, err)); } /* * Create a boot environment from pre-existing snapshot, specifying a depth. */ int be_create_depth(libbe_handle_t *lbh, const char *bename, const char *snap, int depth) { return (be_clone(lbh, bename, snap, depth)); } /* * Create the boot environment from pre-existing snapshot */ int be_create_from_existing_snap(libbe_handle_t *lbh, const char *bename, const char *snap) { return (be_clone(lbh, bename, snap, -1)); } /* * Create a boot environment from an existing boot environment */ int be_create_from_existing(libbe_handle_t *lbh, const char *bename, const char *old) { int err; char snap[BE_MAXPATHLEN]; if ((err = be_snapshot(lbh, old, NULL, true, snap)) != 0) return (set_error(lbh, err)); err = be_clone(lbh, bename, snap, -1); return (set_error(lbh, err)); } /* * Verifies that a snapshot has a valid name, exists, and has a mountpoint of * '/'. Returns BE_ERR_SUCCESS (0), upon success, or the relevant BE_ERR_* upon * failure. Does not set the internal library error state. */ int be_validate_snap(libbe_handle_t *lbh, const char *snap_name) { if (strlen(snap_name) >= BE_MAXPATHLEN) return (BE_ERR_PATHLEN); if (!zfs_name_valid(snap_name, ZFS_TYPE_SNAPSHOT)) return (BE_ERR_INVALIDNAME); if (!zfs_dataset_exists(lbh->lzh, snap_name, ZFS_TYPE_SNAPSHOT)) return (BE_ERR_NOENT); return (BE_ERR_SUCCESS); } /* * Idempotently appends the name argument to the root boot environment path * and copies the resulting string into the result buffer (which is assumed * to be at least BE_MAXPATHLEN characters long. Returns BE_ERR_SUCCESS upon * success, BE_ERR_PATHLEN if the resulting path is longer than BE_MAXPATHLEN, * or BE_ERR_INVALIDNAME if the name is a path that does not begin with * zfs_be_root. Does not set internal library error state. */ int be_root_concat(libbe_handle_t *lbh, const char *name, char *result) { size_t name_len, root_len; name_len = strlen(name); root_len = strlen(lbh->root); /* Act idempotently; return be name if it is already a full path */ if (strrchr(name, '/') != NULL) { if (strstr(name, lbh->root) != name) return (BE_ERR_INVALIDNAME); if (name_len >= BE_MAXPATHLEN) return (BE_ERR_PATHLEN); strlcpy(result, name, BE_MAXPATHLEN); return (BE_ERR_SUCCESS); } else if (name_len + root_len + 1 < BE_MAXPATHLEN) { snprintf(result, BE_MAXPATHLEN, "%s/%s", lbh->root, name); return (BE_ERR_SUCCESS); } return (BE_ERR_PATHLEN); } /* * Verifies the validity of a boot environment name (A-Za-z0-9-_.). Returns * BE_ERR_SUCCESS (0) if name is valid, otherwise returns BE_ERR_INVALIDNAME * or BE_ERR_PATHLEN. * Does not set internal library error state. */ int be_validate_name(libbe_handle_t *lbh, const char *name) { /* * Impose the additional restriction that the entire dataset name must * not exceed the maximum length of a dataset, i.e. MAXNAMELEN. */ if (strlen(lbh->root) + 1 + strlen(name) > MAXNAMELEN) return (BE_ERR_PATHLEN); if (!zfs_name_valid(name, ZFS_TYPE_DATASET)) return (BE_ERR_INVALIDNAME); return (BE_ERR_SUCCESS); } /* * usage */ int be_rename(libbe_handle_t *lbh, const char *old, const char *new) { char full_old[BE_MAXPATHLEN]; char full_new[BE_MAXPATHLEN]; zfs_handle_t *zfs_hdl; int err; /* * be_validate_name is documented not to set error state, so we should * do so here. */ if ((err = be_validate_name(lbh, new)) != 0) return (set_error(lbh, err)); if ((err = be_root_concat(lbh, old, full_old)) != 0) return (set_error(lbh, err)); if ((err = be_root_concat(lbh, new, full_new)) != 0) return (set_error(lbh, err)); if (!zfs_dataset_exists(lbh->lzh, full_old, ZFS_TYPE_DATASET)) return (set_error(lbh, BE_ERR_NOENT)); if (zfs_dataset_exists(lbh->lzh, full_new, ZFS_TYPE_DATASET)) return (set_error(lbh, BE_ERR_EXISTS)); if ((zfs_hdl = zfs_open(lbh->lzh, full_old, ZFS_TYPE_FILESYSTEM)) == NULL) return (set_error(lbh, BE_ERR_ZFSOPEN)); /* recurse, nounmount, forceunmount */ struct renameflags flags = { .nounmount = 1, }; err = zfs_rename(zfs_hdl, NULL, full_new, flags); zfs_close(zfs_hdl); if (err != 0) return (set_error(lbh, BE_ERR_UNKNOWN)); return (0); } int be_export(libbe_handle_t *lbh, const char *bootenv, int fd) { char snap_name[BE_MAXPATHLEN]; char buf[BE_MAXPATHLEN]; zfs_handle_t *zfs; sendflags_t flags = { 0 }; int err; if ((err = be_snapshot(lbh, bootenv, NULL, true, snap_name)) != 0) /* Use the error set by be_snapshot */ return (err); be_root_concat(lbh, snap_name, buf); if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_DATASET)) == NULL) return (set_error(lbh, BE_ERR_ZFSOPEN)); err = zfs_send_one(zfs, NULL, fd, flags); zfs_close(zfs); return (err); } int be_import(libbe_handle_t *lbh, const char *bootenv, int fd) { char buf[BE_MAXPATHLEN]; nvlist_t *props; zfs_handle_t *zfs; recvflags_t flags = { .nomount = 1 }; int err; be_root_concat(lbh, bootenv, buf); if ((err = zfs_receive(lbh->lzh, buf, NULL, &flags, fd, NULL)) != 0) { switch (err) { case EINVAL: return (set_error(lbh, BE_ERR_NOORIGIN)); case ENOENT: return (set_error(lbh, BE_ERR_NOENT)); case EIO: return (set_error(lbh, BE_ERR_IO)); default: return (set_error(lbh, BE_ERR_UNKNOWN)); } } if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_FILESYSTEM)) == NULL) return (set_error(lbh, BE_ERR_ZFSOPEN)); nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP); nvlist_add_string(props, "canmount", "noauto"); nvlist_add_string(props, "mountpoint", "none"); err = zfs_prop_set_list(zfs, props); nvlist_free(props); zfs_close(zfs); if (err != 0) return (set_error(lbh, BE_ERR_UNKNOWN)); return (0); } #if SOON static int be_create_child_noent(libbe_handle_t *lbh, const char *active, const char *child_path) { nvlist_t *props; zfs_handle_t *zfs; int err; nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP); nvlist_add_string(props, "canmount", "noauto"); nvlist_add_string(props, "mountpoint", child_path); /* Create */ if ((err = zfs_create(lbh->lzh, active, ZFS_TYPE_DATASET, props)) != 0) { switch (err) { case EZFS_EXISTS: return (set_error(lbh, BE_ERR_EXISTS)); case EZFS_NOENT: return (set_error(lbh, BE_ERR_NOENT)); case EZFS_BADTYPE: case EZFS_BADVERSION: return (set_error(lbh, BE_ERR_NOPOOL)); case EZFS_BADPROP: default: /* We set something up wrong, probably... */ return (set_error(lbh, BE_ERR_UNKNOWN)); } } nvlist_free(props); if ((zfs = zfs_open(lbh->lzh, active, ZFS_TYPE_DATASET)) == NULL) return (set_error(lbh, BE_ERR_ZFSOPEN)); /* Set props */ if ((err = zfs_prop_set(zfs, "canmount", "noauto")) != 0) { zfs_close(zfs); /* * Similar to other cases, this shouldn't fail unless we've * done something wrong. This is a new dataset that shouldn't * have been mounted anywhere between creation and now. */ if (err == EZFS_NOMEM) return (set_error(lbh, BE_ERR_NOMEM)); return (set_error(lbh, BE_ERR_UNKNOWN)); } zfs_close(zfs); return (BE_ERR_SUCCESS); } static int be_create_child_cloned(libbe_handle_t *lbh, const char *active) { char buf[BE_MAXPATHLEN], tmp[BE_MAXPATHLEN];; zfs_handle_t *zfs; int err; /* XXX TODO ? */ /* * Establish if the existing path is a zfs dataset or just * the subdirectory of one */ strlcpy(tmp, "tmp/be_snap.XXXXX", sizeof(tmp)); if (mktemp(tmp) == NULL) return (set_error(lbh, BE_ERR_UNKNOWN)); be_root_concat(lbh, tmp, buf); printf("Here %s?\n", buf); if ((err = zfs_snapshot(lbh->lzh, buf, false, NULL)) != 0) { switch (err) { case EZFS_INVALIDNAME: return (set_error(lbh, BE_ERR_INVALIDNAME)); default: /* * The other errors that zfs_ioc_snapshot might return * shouldn't happen if we've set things up properly, so * we'll gloss over them and call it UNKNOWN as it will * require further triage. */ if (errno == ENOTSUP) return (set_error(lbh, BE_ERR_NOPOOL)); return (set_error(lbh, BE_ERR_UNKNOWN)); } } /* Clone */ if ((zfs = zfs_open(lbh->lzh, buf, ZFS_TYPE_SNAPSHOT)) == NULL) return (BE_ERR_ZFSOPEN); if ((err = zfs_clone(zfs, active, NULL)) != 0) /* XXX TODO correct error */ return (set_error(lbh, BE_ERR_UNKNOWN)); /* set props */ zfs_close(zfs); return (BE_ERR_SUCCESS); } int be_add_child(libbe_handle_t *lbh, const char *child_path, bool cp_if_exists) { struct stat sb; char active[BE_MAXPATHLEN], buf[BE_MAXPATHLEN]; nvlist_t *props; const char *s; /* Require absolute paths */ if (*child_path != '/') return (set_error(lbh, BE_ERR_BADPATH)); strlcpy(active, be_active_path(lbh), BE_MAXPATHLEN); strcpy(buf, active); /* Create non-mountable parent dataset(s) */ s = child_path; for (char *p; (p = strchr(s+1, '/')) != NULL; s = p) { size_t len = p - s; strncat(buf, s, len); nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP); nvlist_add_string(props, "canmount", "off"); nvlist_add_string(props, "mountpoint", "none"); zfs_create(lbh->lzh, buf, ZFS_TYPE_DATASET, props); nvlist_free(props); } /* Path does not exist as a descendent of / yet */ if (strlcat(active, child_path, BE_MAXPATHLEN) >= BE_MAXPATHLEN) return (set_error(lbh, BE_ERR_PATHLEN)); if (stat(child_path, &sb) != 0) { /* Verify that error is ENOENT */ if (errno != ENOENT) return (set_error(lbh, BE_ERR_UNKNOWN)); return (be_create_child_noent(lbh, active, child_path)); } else if (cp_if_exists) /* Path is already a descendent of / and should be copied */ return (be_create_child_cloned(lbh, active)); return (set_error(lbh, BE_ERR_EXISTS)); } #endif /* SOON */ static int be_set_nextboot(libbe_handle_t *lbh, nvlist_t *config, uint64_t pool_guid, const char *zfsdev) { nvlist_t **child; uint64_t vdev_guid; int c, children; if (nvlist_lookup_nvlist_array(config, ZPOOL_CONFIG_CHILDREN, &child, &children) == 0) { for (c = 0; c < children; ++c) if (be_set_nextboot(lbh, child[c], pool_guid, zfsdev) != 0) return (1); return (0); } if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, &vdev_guid) != 0) { return (1); } if (zpool_nextboot(lbh->lzh, pool_guid, vdev_guid, zfsdev) != 0) { perror("ZFS_IOC_NEXTBOOT failed"); return (1); } return (0); } /* * Deactivate old BE dataset; currently just sets canmount=noauto */ static int be_deactivate(libbe_handle_t *lbh, const char *ds) { zfs_handle_t *zfs; if ((zfs = zfs_open(lbh->lzh, ds, ZFS_TYPE_DATASET)) == NULL) return (1); if (zfs_prop_set(zfs, "canmount", "noauto") != 0) return (1); zfs_close(zfs); return (0); } int be_activate(libbe_handle_t *lbh, const char *bootenv, bool temporary) { char be_path[BE_MAXPATHLEN]; char buf[BE_MAXPATHLEN]; nvlist_t *config, *dsprops, *vdevs; char *origin; uint64_t pool_guid; zfs_handle_t *zhp; int err; be_root_concat(lbh, bootenv, be_path); /* Note: be_exists fails if mountpoint is not / */ if ((err = be_exists(lbh, be_path)) != 0) return (set_error(lbh, err)); if (temporary) { config = zpool_get_config(lbh->active_phandle, NULL); if (config == NULL) /* config should be fetchable... */ return (set_error(lbh, BE_ERR_UNKNOWN)); if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid) != 0) /* Similarly, it shouldn't be possible */ return (set_error(lbh, BE_ERR_UNKNOWN)); /* Expected format according to zfsbootcfg(8) man */ snprintf(buf, sizeof(buf), "zfs:%s:", be_path); /* We have no config tree */ if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &vdevs) != 0) return (set_error(lbh, BE_ERR_NOPOOL)); return (be_set_nextboot(lbh, vdevs, pool_guid, buf)); } else { if (be_deactivate(lbh, lbh->bootfs) != 0) return (-1); /* Obtain bootenv zpool */ err = zpool_set_prop(lbh->active_phandle, "bootfs", be_path); if (err) return (-1); zhp = zfs_open(lbh->lzh, be_path, ZFS_TYPE_FILESYSTEM); if (zhp == NULL) return (-1); if (be_prop_list_alloc(&dsprops) != 0) return (-1); if (be_get_dataset_props(lbh, be_path, dsprops) != 0) { nvlist_free(dsprops); return (-1); } if (nvlist_lookup_string(dsprops, "origin", &origin) == 0) err = zfs_promote(zhp); nvlist_free(dsprops); zfs_close(zhp); if (err) return (-1); } return (BE_ERR_SUCCESS); } Index: head/lib/libbe/be_access.c =================================================================== --- head/lib/libbe/be_access.c (revision 355459) +++ head/lib/libbe/be_access.c (revision 355460) @@ -1,341 +1,343 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2017 Kyle J. Kneitinger * Copyright (c) 2018 Kyle Evans * Copyright (c) 2019 Wes Maag * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); +#include + #include "be.h" #include "be_impl.h" struct be_mountcheck_info { const char *path; char *name; }; struct be_mount_info { libbe_handle_t *lbh; const char *be; const char *mountpoint; int mntflags; int deepmount; int depth; }; static int be_mountcheck_cb(zfs_handle_t *zfs_hdl, void *data) { struct be_mountcheck_info *info; char *mountpoint; if (data == NULL) return (1); info = (struct be_mountcheck_info *)data; if (!zfs_is_mounted(zfs_hdl, &mountpoint)) return (0); if (strcmp(mountpoint, info->path) == 0) { info->name = strdup(zfs_get_name(zfs_hdl)); free(mountpoint); return (1); } free(mountpoint); return (0); } /* * Called from be_mount, uses the given zfs_handle and attempts to * mount it at the passed mountpoint. If the deepmount flag is set, continue * calling the function for each child dataset. */ static int be_mount_iter(zfs_handle_t *zfs_hdl, void *data) { int err; char *mountpoint; char tmp[BE_MAXPATHLEN], zfs_mnt[BE_MAXPATHLEN]; struct be_mount_info *info; char opt; info = (struct be_mount_info *)data; if (zfs_is_mounted(zfs_hdl, &mountpoint)) { free(mountpoint); return (0); } /* * canmount and mountpoint are both ignored for the BE dataset, because * the rest of the system (kernel and loader) will effectively do the * same. */ if (info->depth == 0) { snprintf(tmp, BE_MAXPATHLEN, "%s", info->mountpoint); } else { if (zfs_prop_get_int(zfs_hdl, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_OFF) return (0); if (zfs_prop_get(zfs_hdl, ZFS_PROP_MOUNTPOINT, zfs_mnt, BE_MAXPATHLEN, NULL, NULL, 0, 1)) return (1); /* * We've encountered mountpoint=none at some intermediate * dataset (e.g. zroot/var) that will have children that may * need to be mounted. Skip mounting it, but iterate through * the children. */ if (strcmp("none", zfs_mnt) == 0) goto skipmount; mountpoint = be_mountpoint_augmented(info->lbh, zfs_mnt); snprintf(tmp, BE_MAXPATHLEN, "%s%s", info->mountpoint, mountpoint); } opt = '\0'; if ((err = zmount(zfs_get_name(zfs_hdl), tmp, info->mntflags, __DECONST(char *, MNTTYPE_ZFS), NULL, 0, &opt, 1)) != 0) { switch (errno) { case ENAMETOOLONG: return (set_error(info->lbh, BE_ERR_PATHLEN)); case ELOOP: case ENOENT: case ENOTDIR: return (set_error(info->lbh, BE_ERR_BADPATH)); case EPERM: return (set_error(info->lbh, BE_ERR_PERMS)); case EBUSY: return (set_error(info->lbh, BE_ERR_PATHBUSY)); default: return (set_error(info->lbh, BE_ERR_UNKNOWN)); } } if (!info->deepmount) return (0); skipmount: ++info->depth; err = zfs_iter_filesystems(zfs_hdl, be_mount_iter, info); --info->depth; return (err); } static int be_umount_iter(zfs_handle_t *zfs_hdl, void *data) { int err; char *mountpoint; struct be_mount_info *info; info = (struct be_mount_info *)data; ++info->depth; if((err = zfs_iter_filesystems(zfs_hdl, be_umount_iter, info)) != 0) { return (err); } --info->depth; if (!zfs_is_mounted(zfs_hdl, &mountpoint)) { return (0); } free(mountpoint); if (zfs_unmount(zfs_hdl, NULL, info->mntflags) != 0) { switch (errno) { case ENAMETOOLONG: return (set_error(info->lbh, BE_ERR_PATHLEN)); case ELOOP: case ENOENT: case ENOTDIR: return (set_error(info->lbh, BE_ERR_BADPATH)); case EPERM: return (set_error(info->lbh, BE_ERR_PERMS)); case EBUSY: return (set_error(info->lbh, BE_ERR_PATHBUSY)); default: return (set_error(info->lbh, BE_ERR_UNKNOWN)); } } return (0); } /* * usage */ int be_mounted_at(libbe_handle_t *lbh, const char *path, nvlist_t *details) { char be[BE_MAXPATHLEN]; zfs_handle_t *root_hdl; struct be_mountcheck_info info; prop_data_t propinfo; bzero(&be, BE_MAXPATHLEN); if ((root_hdl = zfs_open(lbh->lzh, lbh->root, ZFS_TYPE_FILESYSTEM)) == NULL) return (BE_ERR_ZFSOPEN); info.path = path; info.name = NULL; zfs_iter_filesystems(root_hdl, be_mountcheck_cb, &info); zfs_close(root_hdl); if (info.name != NULL) { if (details != NULL) { if ((root_hdl = zfs_open(lbh->lzh, lbh->root, ZFS_TYPE_FILESYSTEM)) == NULL) { free(info.name); return (BE_ERR_ZFSOPEN); } propinfo.lbh = lbh; propinfo.list = details; propinfo.single_object = false; prop_list_builder_cb(root_hdl, &propinfo); zfs_close(root_hdl); } free(info.name); return (0); } return (1); } /* * usage */ int be_mount(libbe_handle_t *lbh, char *bootenv, char *mountpoint, int flags, char *result_loc) { char be[BE_MAXPATHLEN]; char mnt_temp[BE_MAXPATHLEN]; int mntflags, mntdeep; int err; struct be_mount_info info; zfs_handle_t *zhdl; if ((err = be_root_concat(lbh, bootenv, be)) != 0) return (set_error(lbh, err)); if ((err = be_exists(lbh, bootenv)) != 0) return (set_error(lbh, err)); if (is_mounted(lbh->lzh, be, NULL)) return (set_error(lbh, BE_ERR_MOUNTED)); mntdeep = (flags & BE_MNT_DEEP) ? 1 : 0; mntflags = (flags & BE_MNT_FORCE) ? MNT_FORCE : 0; /* Create mountpoint if it is not specified */ if (mountpoint == NULL) { strlcpy(mnt_temp, "/tmp/be_mount.XXXX", sizeof(mnt_temp)); if (mkdtemp(mnt_temp) == NULL) return (set_error(lbh, BE_ERR_IO)); } if ((zhdl = zfs_open(lbh->lzh, be, ZFS_TYPE_FILESYSTEM)) == NULL) return (set_error(lbh, BE_ERR_ZFSOPEN)); info.lbh = lbh; info.be = be; info.mountpoint = (mountpoint == NULL) ? mnt_temp : mountpoint; info.mntflags = mntflags; info.deepmount = mntdeep; info.depth = 0; if((err = be_mount_iter(zhdl, &info) != 0)) { zfs_close(zhdl); return (err); } zfs_close(zhdl); if (result_loc != NULL) strlcpy(result_loc, mountpoint == NULL ? mnt_temp : mountpoint, BE_MAXPATHLEN); return (BE_ERR_SUCCESS); } /* * usage */ int be_unmount(libbe_handle_t *lbh, char *bootenv, int flags) { int err; char be[BE_MAXPATHLEN]; zfs_handle_t *root_hdl; struct be_mount_info info; if ((err = be_root_concat(lbh, bootenv, be)) != 0) return (set_error(lbh, err)); if ((root_hdl = zfs_open(lbh->lzh, be, ZFS_TYPE_FILESYSTEM)) == NULL) return (set_error(lbh, BE_ERR_ZFSOPEN)); info.lbh = lbh; info.be = be; info.mountpoint = NULL; info.mntflags = (flags & BE_MNT_FORCE) ? MS_FORCE : 0; info.depth = 0; if ((err = be_umount_iter(root_hdl, &info)) != 0) { zfs_close(root_hdl); return (err); } zfs_close(root_hdl); return (BE_ERR_SUCCESS); } /* * This function will blow away the input buffer as needed if we're discovered * to be looking at a root-mount. If the mountpoint is naturally beyond the * root, however, the buffer may be left intact and a pointer to the section * past altroot will be returned instead for the caller's perusal. */ char * be_mountpoint_augmented(libbe_handle_t *lbh, char *mountpoint) { if (lbh->altroot_len == 0) return (mountpoint); if (mountpoint == NULL || *mountpoint == '\0') return (mountpoint); if (mountpoint[lbh->altroot_len] == '\0') { *(mountpoint + 1) = '\0'; return (mountpoint); } else return (mountpoint + lbh->altroot_len); } Index: head/lib/libbe/be_info.c =================================================================== --- head/lib/libbe/be_info.c (revision 355459) +++ head/lib/libbe/be_info.c (revision 355460) @@ -1,306 +1,308 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2017 Kyle J. Kneitinger * Copyright (c) 2018 Kyle Evans * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); +#include + #include "be.h" #include "be_impl.h" static int snapshot_proplist_update(zfs_handle_t *hdl, prop_data_t *data); /* * Returns the name of the active boot environment */ const char * be_active_name(libbe_handle_t *lbh) { if (*lbh->rootfs != '\0') return (strrchr(lbh->rootfs, '/') + sizeof(char)); else return (lbh->rootfs); } /* * Returns full path of the active boot environment */ const char * be_active_path(libbe_handle_t *lbh) { return (lbh->rootfs); } /* * Returns the name of the next active boot environment */ const char * be_nextboot_name(libbe_handle_t *lbh) { if (*lbh->bootfs != '\0') return (strrchr(lbh->bootfs, '/') + sizeof(char)); else return (lbh->bootfs); } /* * Returns full path of the active boot environment */ const char * be_nextboot_path(libbe_handle_t *lbh) { return (lbh->bootfs); } /* * Returns the path of the boot environment root dataset */ const char * be_root_path(libbe_handle_t *lbh) { return (lbh->root); } /* * Populates dsnvl with one nvlist per bootenv dataset describing the properties * of that dataset that we've declared ourselves to care about. */ int be_get_bootenv_props(libbe_handle_t *lbh, nvlist_t *dsnvl) { prop_data_t data; data.lbh = lbh; data.list = dsnvl; data.single_object = false; return (be_proplist_update(&data)); } int be_get_dataset_props(libbe_handle_t *lbh, const char *name, nvlist_t *props) { zfs_handle_t *snap_hdl; prop_data_t data; int ret; data.lbh = lbh; data.list = props; data.single_object = true; if ((snap_hdl = zfs_open(lbh->lzh, name, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT)) == NULL) return (BE_ERR_ZFSOPEN); ret = prop_list_builder_cb(snap_hdl, &data); zfs_close(snap_hdl); return (ret); } int be_get_dataset_snapshots(libbe_handle_t *lbh, const char *name, nvlist_t *props) { zfs_handle_t *ds_hdl; prop_data_t data; int ret; data.lbh = lbh; data.list = props; data.single_object = false; if ((ds_hdl = zfs_open(lbh->lzh, name, ZFS_TYPE_FILESYSTEM)) == NULL) return (BE_ERR_ZFSOPEN); ret = snapshot_proplist_update(ds_hdl, &data); zfs_close(ds_hdl); return (ret); } /* * Internal callback function used by zfs_iter_filesystems. For each dataset in * the bootenv root, populate an nvlist_t of its relevant properties. */ int prop_list_builder_cb(zfs_handle_t *zfs_hdl, void *data_p) { char buf[512], *mountpoint; prop_data_t *data; libbe_handle_t *lbh; nvlist_t *props; const char *dataset, *name; boolean_t mounted; /* * XXX TODO: * some system for defining constants for the nvlist keys * error checking */ data = (prop_data_t *)data_p; lbh = data->lbh; if (data->single_object) props = data->list; else nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP); dataset = zfs_get_name(zfs_hdl); nvlist_add_string(props, "dataset", dataset); name = strrchr(dataset, '/') + 1; nvlist_add_string(props, "name", name); mounted = zfs_is_mounted(zfs_hdl, &mountpoint); if (mounted) nvlist_add_string(props, "mounted", mountpoint); if (zfs_prop_get(zfs_hdl, ZFS_PROP_MOUNTPOINT, buf, 512, NULL, NULL, 0, 1) == 0) nvlist_add_string(props, "mountpoint", buf); if (zfs_prop_get(zfs_hdl, ZFS_PROP_ORIGIN, buf, 512, NULL, NULL, 0, 1) == 0) nvlist_add_string(props, "origin", buf); if (zfs_prop_get(zfs_hdl, ZFS_PROP_CREATION, buf, 512, NULL, NULL, 0, 1) == 0) nvlist_add_string(props, "creation", buf); nvlist_add_boolean_value(props, "active", (strcmp(be_active_path(lbh), dataset) == 0)); if (zfs_prop_get(zfs_hdl, ZFS_PROP_USED, buf, 512, NULL, NULL, 0, 1) == 0) nvlist_add_string(props, "used", buf); if (zfs_prop_get(zfs_hdl, ZFS_PROP_USEDDS, buf, 512, NULL, NULL, 0, 1) == 0) nvlist_add_string(props, "usedds", buf); if (zfs_prop_get(zfs_hdl, ZFS_PROP_USEDSNAP, buf, 512, NULL, NULL, 0, 1) == 0) nvlist_add_string(props, "usedsnap", buf); if (zfs_prop_get(zfs_hdl, ZFS_PROP_USEDREFRESERV, buf, 512, NULL, NULL, 0, 1) == 0) nvlist_add_string(props, "usedrefreserv", buf); if (zfs_prop_get(zfs_hdl, ZFS_PROP_REFERENCED, buf, 512, NULL, NULL, 0, 1) == 0) nvlist_add_string(props, "referenced", buf); nvlist_add_boolean_value(props, "nextboot", (strcmp(be_nextboot_path(lbh), dataset) == 0)); if (!data->single_object) nvlist_add_nvlist(data->list, name, props); return (0); } /* * Updates the properties of each bootenv in the libbe handle * XXX TODO: ensure that this is always consistent (run after adds, deletes, * renames,etc */ int be_proplist_update(prop_data_t *data) { zfs_handle_t *root_hdl; if ((root_hdl = zfs_open(data->lbh->lzh, data->lbh->root, ZFS_TYPE_FILESYSTEM)) == NULL) return (BE_ERR_ZFSOPEN); /* XXX TODO: some error checking here */ zfs_iter_filesystems(root_hdl, prop_list_builder_cb, data); zfs_close(root_hdl); return (0); } static int snapshot_proplist_update(zfs_handle_t *hdl, prop_data_t *data) { return (zfs_iter_snapshots_sorted(hdl, prop_list_builder_cb, data, 0, 0)); } int be_prop_list_alloc(nvlist_t **be_list) { return (nvlist_alloc(be_list, NV_UNIQUE_NAME, KM_SLEEP)); } /* * frees property list and its children */ void be_prop_list_free(nvlist_t *be_list) { nvlist_t *prop_list; nvpair_t *be_pair; be_pair = nvlist_next_nvpair(be_list, NULL); if (nvpair_value_nvlist(be_pair, &prop_list) == 0) nvlist_free(prop_list); while ((be_pair = nvlist_next_nvpair(be_list, be_pair)) != NULL) { if (nvpair_value_nvlist(be_pair, &prop_list) == 0) nvlist_free(prop_list); } } /* * Usage */ int be_exists(libbe_handle_t *lbh, char *be) { char buf[BE_MAXPATHLEN]; be_root_concat(lbh, be, buf); if (!zfs_dataset_exists(lbh->lzh, buf, ZFS_TYPE_DATASET)) return (BE_ERR_NOENT); return (BE_ERR_SUCCESS); }