/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. */ /* * System includes */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Library wide variables */ libzfs_handle_t *g_zfs = NULL; /* Private function prototypes */ static int _be_destroy(const char *, be_destroy_data_t *); static int be_destroy_zones(char *, char *, be_destroy_data_t *); static int be_destroy_zone_roots(char *, be_destroy_data_t *); static int be_destroy_zone_roots_callback(zfs_handle_t *, void *); static int be_copy_zones(char *, char *, char *); static int be_clone_fs_callback(zfs_handle_t *, void *); static int be_destroy_callback(zfs_handle_t *, void *); static int be_send_fs_callback(zfs_handle_t *, void *); static int be_demote_callback(zfs_handle_t *, void *); static int be_demote_find_clone_callback(zfs_handle_t *, void *); static int be_demote_get_one_clone(zfs_handle_t *, void *); static int be_get_snap(char *, char **); static int be_prep_clone_send_fs(zfs_handle_t *, be_transaction_data_t *, char *, int); static boolean_t be_create_container_ds(char *); static char *be_get_zone_be_name(char *root_ds, char *container_ds); static int be_zone_root_exists_callback(zfs_handle_t *, void *); /* ******************************************************************** */ /* Public Functions */ /* ******************************************************************** */ /* * Function: be_init * Description: Creates the initial datasets for a BE and leaves them * unpopulated. The resultant BE can be mounted but can't * yet be activated or booted. * Parameters: * be_attrs - pointer to nvlist_t of attributes being passed in. * The following attributes are used by this function: * * BE_ATTR_NEW_BE_NAME *required * BE_ATTR_NEW_BE_POOL *required * BE_ATTR_ZFS_PROPERTIES *optional * BE_ATTR_FS_NAMES *optional * BE_ATTR_FS_NUM *optional * BE_ATTR_SHARED_FS_NAMES *optional * BE_ATTR_SHARED_FS_NUM *optional * Return: * BE_SUCCESS - Success * be_errno_t - Failure * Scope: * Public */ int be_init(nvlist_t *be_attrs) { be_transaction_data_t bt = { 0 }; zpool_handle_t *zlp; nvlist_t *zfs_props = NULL; char nbe_root_ds[MAXPATHLEN]; char child_fs[MAXPATHLEN]; char **fs_names = NULL; char **shared_fs_names = NULL; uint16_t fs_num = 0; uint16_t shared_fs_num = 0; int nelem; int i; int zret = 0, ret = BE_SUCCESS; /* Initialize libzfs handle */ if (!be_zfs_init()) return (BE_ERR_INIT); /* Get new BE name */ if (nvlist_lookup_string(be_attrs, BE_ATTR_NEW_BE_NAME, &bt.nbe_name) != 0) { be_print_err(gettext("be_init: failed to lookup " "BE_ATTR_NEW_BE_NAME attribute\n")); return (BE_ERR_INVAL); } /* Validate new BE name */ if (!be_valid_be_name(bt.nbe_name)) { be_print_err(gettext("be_init: invalid BE name %s\n"), bt.nbe_name); return (BE_ERR_INVAL); } /* Get zpool name */ if (nvlist_lookup_string(be_attrs, BE_ATTR_NEW_BE_POOL, &bt.nbe_zpool) != 0) { be_print_err(gettext("be_init: failed to lookup " "BE_ATTR_NEW_BE_POOL attribute\n")); return (BE_ERR_INVAL); } /* Get file system attributes */ nelem = 0; if (nvlist_lookup_pairs(be_attrs, 0, BE_ATTR_FS_NUM, DATA_TYPE_UINT16, &fs_num, BE_ATTR_FS_NAMES, DATA_TYPE_STRING_ARRAY, &fs_names, &nelem, NULL) != 0) { be_print_err(gettext("be_init: failed to lookup fs " "attributes\n")); return (BE_ERR_INVAL); } if (nelem != fs_num) { be_print_err(gettext("be_init: size of FS_NAMES array (%d) " "does not match FS_NUM (%d)\n"), nelem, fs_num); return (BE_ERR_INVAL); } /* Get shared file system attributes */ nelem = 0; if (nvlist_lookup_pairs(be_attrs, NV_FLAG_NOENTOK, BE_ATTR_SHARED_FS_NUM, DATA_TYPE_UINT16, &shared_fs_num, BE_ATTR_SHARED_FS_NAMES, DATA_TYPE_STRING_ARRAY, &shared_fs_names, &nelem, NULL) != 0) { be_print_err(gettext("be_init: failed to lookup " "shared fs attributes\n")); return (BE_ERR_INVAL); } if (nelem != shared_fs_num) { be_print_err(gettext("be_init: size of SHARED_FS_NAMES " "array does not match SHARED_FS_NUM\n")); return (BE_ERR_INVAL); } /* Verify that nbe_zpool exists */ if ((zlp = zpool_open(g_zfs, bt.nbe_zpool)) == NULL) { be_print_err(gettext("be_init: failed to " "find existing zpool (%s): %s\n"), bt.nbe_zpool, libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } zpool_close(zlp); /* * Verify BE container dataset in nbe_zpool exists. * If not, create it. */ if (!be_create_container_ds(bt.nbe_zpool)) return (BE_ERR_CREATDS); /* * Verify that nbe_name doesn't already exist in some pool. */ if ((zret = zpool_iter(g_zfs, be_exists_callback, bt.nbe_name)) > 0) { be_print_err(gettext("be_init: BE (%s) already exists\n"), bt.nbe_name); return (BE_ERR_BE_EXISTS); } else if (zret < 0) { be_print_err(gettext("be_init: zpool_iter failed: %s\n"), libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* Generate string for BE's root dataset */ be_make_root_ds(bt.nbe_zpool, bt.nbe_name, nbe_root_ds, sizeof (nbe_root_ds)); /* * Create property list for new BE root dataset. If some * zfs properties were already provided by the caller, dup * that list. Otherwise initialize a new property list. */ if (nvlist_lookup_pairs(be_attrs, NV_FLAG_NOENTOK, BE_ATTR_ZFS_PROPERTIES, DATA_TYPE_NVLIST, &zfs_props, NULL) != 0) { be_print_err(gettext("be_init: failed to lookup " "BE_ATTR_ZFS_PROPERTIES attribute\n")); return (BE_ERR_INVAL); } if (zfs_props != NULL) { /* Make sure its a unique nvlist */ if (!(zfs_props->nvl_nvflag & NV_UNIQUE_NAME) && !(zfs_props->nvl_nvflag & NV_UNIQUE_NAME_TYPE)) { be_print_err(gettext("be_init: ZFS property list " "not unique\n")); return (BE_ERR_INVAL); } /* Dup the list */ if (nvlist_dup(zfs_props, &bt.nbe_zfs_props, 0) != 0) { be_print_err(gettext("be_init: failed to dup ZFS " "property list\n")); return (BE_ERR_NOMEM); } } else { /* Initialize new nvlist */ if (nvlist_alloc(&bt.nbe_zfs_props, NV_UNIQUE_NAME, 0) != 0) { be_print_err(gettext("be_init: internal " "error: out of memory\n")); return (BE_ERR_NOMEM); } } /* Set the mountpoint property for the root dataset */ if (nvlist_add_string(bt.nbe_zfs_props, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), "/") != 0) { be_print_err(gettext("be_init: internal error " "out of memory\n")); ret = BE_ERR_NOMEM; goto done; } /* Set the 'canmount' property */ if (nvlist_add_string(bt.nbe_zfs_props, zfs_prop_to_name(ZFS_PROP_CANMOUNT), "noauto") != 0) { be_print_err(gettext("be_init: internal error " "out of memory\n")); ret = BE_ERR_NOMEM; goto done; } /* Create BE root dataset for the new BE */ if (zfs_create(g_zfs, nbe_root_ds, ZFS_TYPE_FILESYSTEM, bt.nbe_zfs_props) != 0) { be_print_err(gettext("be_init: failed to " "create BE root dataset (%s): %s\n"), nbe_root_ds, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); goto done; } /* Set UUID for new BE */ if ((ret = be_set_uuid(nbe_root_ds)) != BE_SUCCESS) { be_print_err(gettext("be_init: failed to " "set uuid for new BE\n")); } /* * Clear the mountpoint property so that the non-shared * file systems created below inherit their mountpoints. */ (void) nvlist_remove(bt.nbe_zfs_props, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), DATA_TYPE_STRING); /* Create the new BE's non-shared file systems */ for (i = 0; i < fs_num && fs_names[i]; i++) { /* * If fs == "/", skip it; * we already created the root dataset */ if (strcmp(fs_names[i], "/") == 0) continue; /* Generate string for file system */ (void) snprintf(child_fs, sizeof (child_fs), "%s%s", nbe_root_ds, fs_names[i]); /* Create file system */ if (zfs_create(g_zfs, child_fs, ZFS_TYPE_FILESYSTEM, bt.nbe_zfs_props) != 0) { be_print_err(gettext("be_init: failed to create " "BE's child dataset (%s): %s\n"), child_fs, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); goto done; } } /* Create the new BE's shared file systems */ if (shared_fs_num > 0) { nvlist_t *props = NULL; if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) { be_print_err(gettext("be_init: nvlist_alloc failed\n")); ret = BE_ERR_NOMEM; goto done; } for (i = 0; i < shared_fs_num; i++) { /* Generate string for shared file system */ (void) snprintf(child_fs, sizeof (child_fs), "%s%s", bt.nbe_zpool, shared_fs_names[i]); if (nvlist_add_string(props, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), shared_fs_names[i]) != 0) { be_print_err(gettext("be_init: " "internal error: out of memory\n")); nvlist_free(props); ret = BE_ERR_NOMEM; goto done; } /* Create file system if it doesn't already exist */ if (zfs_dataset_exists(g_zfs, child_fs, ZFS_TYPE_FILESYSTEM)) { continue; } if (zfs_create(g_zfs, child_fs, ZFS_TYPE_FILESYSTEM, props) != 0) { be_print_err(gettext("be_init: failed to " "create BE's shared dataset (%s): %s\n"), child_fs, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); nvlist_free(props); goto done; } } nvlist_free(props); } done: if (bt.nbe_zfs_props != NULL) nvlist_free(bt.nbe_zfs_props); be_zfs_fini(); return (ret); } /* * Function: be_destroy * Description: Destroy a BE and all of its children datasets, snapshots and * zones that belong to the parent BE. * Parameters: * be_attrs - pointer to nvlist_t of attributes being passed in. * The following attributes are used by this function: * * BE_ATTR_ORIG_BE_NAME *required * BE_ATTR_DESTROY_FLAGS *optional * Return: * BE_SUCCESS - Success * be_errno_t - Failure * Scope: * Public */ int be_destroy(nvlist_t *be_attrs) { zfs_handle_t *zhp = NULL; be_transaction_data_t bt = { 0 }; be_transaction_data_t cur_bt = { 0 }; be_destroy_data_t dd = { 0 }; int ret = BE_SUCCESS; uint16_t flags = 0; int zret; char obe_root_ds[MAXPATHLEN]; char *mp = NULL; /* Initialize libzfs handle */ if (!be_zfs_init()) return (BE_ERR_INIT); /* Get name of BE to delete */ if (nvlist_lookup_string(be_attrs, BE_ATTR_ORIG_BE_NAME, &bt.obe_name) != 0) { be_print_err(gettext("be_destroy: failed to lookup " "BE_ATTR_ORIG_BE_NAME attribute\n")); return (BE_ERR_INVAL); } /* * Validate BE name. If valid, then check that the original BE is not * the active BE. If it is the 'active' BE then return an error code * since we can't destroy the active BE. */ if (!be_valid_be_name(bt.obe_name)) { be_print_err(gettext("be_destroy: invalid BE name %s\n"), bt.obe_name); return (BE_ERR_INVAL); } else if (bt.obe_name != NULL) { if ((ret = be_find_current_be(&cur_bt)) != BE_SUCCESS) { return (ret); } if (strcmp(cur_bt.obe_name, bt.obe_name) == 0) { return (BE_ERR_DESTROY_CURR_BE); } } /* Get destroy flags if provided */ if (nvlist_lookup_pairs(be_attrs, NV_FLAG_NOENTOK, BE_ATTR_DESTROY_FLAGS, DATA_TYPE_UINT16, &flags, NULL) != 0) { be_print_err(gettext("be_destroy: failed to lookup " "BE_ATTR_DESTROY_FLAGS attribute\n")); return (BE_ERR_INVAL); } dd.destroy_snaps = flags & BE_DESTROY_FLAG_SNAPSHOTS; dd.force_unmount = flags & BE_DESTROY_FLAG_FORCE_UNMOUNT; /* Find which zpool obe_name lives in */ if ((zret = zpool_iter(g_zfs, be_find_zpool_callback, &bt)) == 0) { be_print_err(gettext("be_destroy: failed to find zpool " "for BE (%s)\n"), bt.obe_name); return (BE_ERR_BE_NOENT); } else if (zret < 0) { be_print_err(gettext("be_destroy: zpool_iter failed: %s\n"), libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* Generate string for obe_name's root dataset */ be_make_root_ds(bt.obe_zpool, bt.obe_name, obe_root_ds, sizeof (obe_root_ds)); bt.obe_root_ds = obe_root_ds; /* * Detect if the BE to destroy has the 'active on boot' property set. * If so, set the 'active on boot' property on the the 'active' BE. */ if (be_is_active_on_boot(bt.obe_name)) { if ((ret = be_activate_current_be()) != BE_SUCCESS) { be_print_err(gettext("be_destroy: failed to " "make the current BE 'active on boot'\n")); return (ret); } } /* Get handle to BE's root dataset */ if ((zhp = zfs_open(g_zfs, bt.obe_root_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_destroy: failed to " "open BE root dataset (%s): %s\n"), bt.obe_root_ds, libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* Get the UUID of the global BE */ if (be_get_uuid(zfs_get_name(zhp), &dd.gz_be_uuid) != BE_SUCCESS) { be_print_err(gettext("be_destroy: BE has no UUID (%s)\n"), zfs_get_name(zhp)); } /* * If the global BE is mounted, make sure we've been given the * flag to forcibly unmount it. */ if (zfs_is_mounted(zhp, &mp)) { if (!(dd.force_unmount)) { be_print_err(gettext("be_destroy: " "%s is currently mounted at %s, cannot destroy\n"), bt.obe_name, mp != NULL ? mp : ""); free(mp); ZFS_CLOSE(zhp); return (BE_ERR_MOUNTED); } free(mp); } /* * Destroy the non-global zone BE's if we are in the global zone * and there is a UUID associated with the global zone BE */ if (getzoneid() == GLOBAL_ZONEID && !uuid_is_null(dd.gz_be_uuid)) { if ((ret = be_destroy_zones(bt.obe_name, bt.obe_root_ds, &dd)) != BE_SUCCESS) { be_print_err(gettext("be_destroy: failed to " "destroy one or more zones for BE %s\n"), bt.obe_name); goto done; } } /* Unmount the BE if it was mounted */ if (zfs_is_mounted(zhp, NULL)) { if ((ret = _be_unmount(bt.obe_name, BE_UNMOUNT_FLAG_FORCE)) != BE_SUCCESS) { be_print_err(gettext("be_destroy: " "failed to unmount %s\n"), bt.obe_name); ZFS_CLOSE(zhp); return (ret); } } ZFS_CLOSE(zhp); /* Destroy this BE */ if ((ret = _be_destroy((const char *)bt.obe_root_ds, &dd)) != BE_SUCCESS) { goto done; } /* Remove BE's entry from the boot menu */ if (getzoneid() == GLOBAL_ZONEID) { if ((ret = be_remove_menu(bt.obe_name, bt.obe_zpool, NULL)) != BE_SUCCESS) { be_print_err(gettext("be_destroy: failed to " "remove BE %s from the boot menu\n"), bt.obe_root_ds); goto done; } } done: be_zfs_fini(); return (ret); } /* * Function: be_copy * Description: This function makes a copy of an existing BE. If the original * BE and the new BE are in the same pool, it uses zfs cloning to * create the new BE, otherwise it does a physical copy. * If the original BE name isn't provided, it uses the currently * booted BE. If the new BE name isn't provided, it creates an * auto named BE and returns that name to the caller. * Parameters: * be_attrs - pointer to nvlist_t of attributes being passed in. * The following attributes are used by this function: * * BE_ATTR_ORIG_BE_NAME *optional * BE_ATTR_SNAP_NAME *optional * BE_ATTR_NEW_BE_NAME *optional * BE_ATTR_NEW_BE_POOL *optional * BE_ATTR_NEW_BE_DESC *optional * BE_ATTR_ZFS_PROPERTIES *optional * BE_ATTR_POLICY *optional * * If the BE_ATTR_NEW_BE_NAME was not passed in, upon * successful BE creation, the following attribute values * will be returned to the caller by setting them in the * be_attrs parameter passed in: * * BE_ATTR_SNAP_NAME * BE_ATTR_NEW_BE_NAME * Return: * BE_SUCCESS - Success * be_errno_t - Failure * Scope: * Public */ int be_copy(nvlist_t *be_attrs) { be_transaction_data_t bt = { 0 }; be_fs_list_data_t fld = { 0 }; zfs_handle_t *zhp = NULL; nvlist_t *zfs_props = NULL; uuid_t uu = { 0 }; char obe_root_ds[MAXPATHLEN]; char nbe_root_ds[MAXPATHLEN]; char ss[MAXPATHLEN]; char *new_mp = NULL; boolean_t autoname = B_FALSE; boolean_t be_created = B_FALSE; int i; int zret; int ret = BE_SUCCESS; /* Initialize libzfs handle */ if (!be_zfs_init()) return (BE_ERR_INIT); /* Get original BE name */ if (nvlist_lookup_pairs(be_attrs, NV_FLAG_NOENTOK, BE_ATTR_ORIG_BE_NAME, DATA_TYPE_STRING, &bt.obe_name, NULL) != 0) { be_print_err(gettext("be_copy: failed to lookup " "BE_ATTR_ORIG_BE_NAME attribute\n")); return (BE_ERR_INVAL); } /* If original BE name not provided, use current BE */ if (bt.obe_name == NULL) { if ((ret = be_find_current_be(&bt)) != BE_SUCCESS) { return (ret); } } else { /* Validate original BE name */ if (!be_valid_be_name(bt.obe_name)) { be_print_err(gettext("be_copy: " "invalid BE name %s\n"), bt.obe_name); return (BE_ERR_INVAL); } } /* Find which zpool obe_name lives in */ if ((zret = zpool_iter(g_zfs, be_find_zpool_callback, &bt)) == 0) { be_print_err(gettext("be_copy: failed to " "find zpool for BE (%s)\n"), bt.obe_name); return (BE_ERR_BE_NOENT); } else if (zret < 0) { be_print_err(gettext("be_copy: " "zpool_iter failed: %s\n"), libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* Get snapshot name of original BE if one was provided */ if (nvlist_lookup_pairs(be_attrs, NV_FLAG_NOENTOK, BE_ATTR_SNAP_NAME, DATA_TYPE_STRING, &bt.obe_snap_name, NULL) != 0) { be_print_err(gettext("be_copy: failed to lookup " "BE_ATTR_SNAP_NAME attribute\n")); return (BE_ERR_INVAL); } /* Get new BE name */ if (nvlist_lookup_pairs(be_attrs, NV_FLAG_NOENTOK, BE_ATTR_NEW_BE_NAME, DATA_TYPE_STRING, &bt.nbe_name, NULL) != 0) { be_print_err(gettext("be_copy: failed to lookup " "BE_ATTR_NEW_BE_NAME attribute\n")); return (BE_ERR_INVAL); } /* Get zpool name to create new BE in */ if (nvlist_lookup_pairs(be_attrs, NV_FLAG_NOENTOK, BE_ATTR_NEW_BE_POOL, DATA_TYPE_STRING, &bt.nbe_zpool, NULL) != 0) { be_print_err(gettext("be_copy: failed to lookup " "BE_ATTR_NEW_BE_POOL attribute\n")); return (BE_ERR_INVAL); } /* Get new BE's description if one was provided */ if (nvlist_lookup_pairs(be_attrs, NV_FLAG_NOENTOK, BE_ATTR_NEW_BE_DESC, DATA_TYPE_STRING, &bt.nbe_desc, NULL) != 0) { be_print_err(gettext("be_copy: failed to lookup " "BE_ATTR_NEW_BE_DESC attribute\n")); return (BE_ERR_INVAL); } /* Get BE policy to create this snapshot under */ if (nvlist_lookup_pairs(be_attrs, NV_FLAG_NOENTOK, BE_ATTR_POLICY, DATA_TYPE_STRING, &bt.policy, NULL) != 0) { be_print_err(gettext("be_copy: failed to lookup " "BE_ATTR_POLICY attribute\n")); return (BE_ERR_INVAL); } /* * Create property list for new BE root dataset. If some * zfs properties were already provided by the caller, dup * that list. Otherwise initialize a new property list. */ if (nvlist_lookup_pairs(be_attrs, NV_FLAG_NOENTOK, BE_ATTR_ZFS_PROPERTIES, DATA_TYPE_NVLIST, &zfs_props, NULL) != 0) { be_print_err(gettext("be_copy: failed to lookup " "BE_ATTR_ZFS_PROPERTIES attribute\n")); return (BE_ERR_INVAL); } if (zfs_props != NULL) { /* Make sure its a unique nvlist */ if (!(zfs_props->nvl_nvflag & NV_UNIQUE_NAME) && !(zfs_props->nvl_nvflag & NV_UNIQUE_NAME_TYPE)) { be_print_err(gettext("be_copy: ZFS property list " "not unique\n")); return (BE_ERR_INVAL); } /* Dup the list */ if (nvlist_dup(zfs_props, &bt.nbe_zfs_props, 0) != 0) { be_print_err(gettext("be_copy: " "failed to dup ZFS property list\n")); return (BE_ERR_NOMEM); } } else { /* Initialize new nvlist */ if (nvlist_alloc(&bt.nbe_zfs_props, NV_UNIQUE_NAME, 0) != 0) { be_print_err(gettext("be_copy: internal " "error: out of memory\n")); return (BE_ERR_NOMEM); } } /* * If new BE name provided, validate the BE name and then verify * that new BE name doesn't already exist in some pool. */ if (bt.nbe_name) { /* Validate original BE name */ if (!be_valid_be_name(bt.nbe_name)) { be_print_err(gettext("be_copy: " "invalid BE name %s\n"), bt.nbe_name); ret = BE_ERR_INVAL; goto done; } /* Verify it doesn't already exist */ if ((zret = zpool_iter(g_zfs, be_exists_callback, bt.nbe_name)) > 0) { be_print_err(gettext("be_copy: BE (%s) already " "exists\n"), bt.nbe_name); ret = BE_ERR_BE_EXISTS; goto done; } else if (zret < 0) { be_print_err(gettext("be_copy: zpool_iter failed: " "%s\n"), libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); goto done; } } else { /* * If an auto named BE is desired, it must be in the same * pool is the original BE. */ if (bt.nbe_zpool != NULL) { be_print_err(gettext("be_copy: cannot specify pool " "name when creating an auto named BE\n")); ret = BE_ERR_INVAL; goto done; } /* * Generate auto named BE */ if ((bt.nbe_name = be_auto_be_name(bt.obe_name)) == NULL) { be_print_err(gettext("be_copy: " "failed to generate auto BE name\n")); ret = BE_ERR_AUTONAME; goto done; } autoname = B_TRUE; } /* * If zpool name to create new BE in is not provided, * create new BE in original BE's pool. */ if (bt.nbe_zpool == NULL) { bt.nbe_zpool = bt.obe_zpool; } /* Get root dataset names for obe_name and nbe_name */ be_make_root_ds(bt.obe_zpool, bt.obe_name, obe_root_ds, sizeof (obe_root_ds)); be_make_root_ds(bt.nbe_zpool, bt.nbe_name, nbe_root_ds, sizeof (nbe_root_ds)); bt.obe_root_ds = obe_root_ds; bt.nbe_root_ds = nbe_root_ds; /* * If an existing snapshot name has been provided to create from, * verify that it exists for the original BE's root dataset. */ if (bt.obe_snap_name != NULL) { /* Generate dataset name for snapshot to use. */ (void) snprintf(ss, sizeof (ss), "%s@%s", bt.obe_root_ds, bt.obe_snap_name); /* Verify snapshot exists */ if (!zfs_dataset_exists(g_zfs, ss, ZFS_TYPE_SNAPSHOT)) { be_print_err(gettext("be_copy: " "snapshot does not exist (%s): %s\n"), ss, libzfs_error_description(g_zfs)); ret = BE_ERR_SS_NOENT; goto done; } } else { /* * Else snapshot name was not provided, generate an * auto named snapshot to use as its origin. */ if ((ret = _be_create_snapshot(bt.obe_name, &bt.obe_snap_name, bt.policy)) != BE_SUCCESS) { be_print_err(gettext("be_copy: " "failed to create auto named snapshot\n")); goto done; } if (nvlist_add_string(be_attrs, BE_ATTR_SNAP_NAME, bt.obe_snap_name) != 0) { be_print_err(gettext("be_copy: " "failed to add snap name to be_attrs\n")); ret = BE_ERR_NOMEM; goto done; } } /* Get handle to original BE's root dataset. */ if ((zhp = zfs_open(g_zfs, bt.obe_root_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_copy: failed to " "open BE root dataset (%s): %s\n"), bt.obe_root_ds, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); goto done; } /* If original BE is currently mounted, record its altroot. */ if (zfs_is_mounted(zhp, &bt.obe_altroot) && bt.obe_altroot == NULL) { be_print_err(gettext("be_copy: failed to " "get altroot of mounted BE %s: %s\n"), bt.obe_name, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); goto done; } if (strcmp(bt.obe_zpool, bt.nbe_zpool) == 0) { /* Do clone */ /* * Iterate through original BE's datasets and clone * them to create new BE. This call will end up closing * the zfs handle passed in whether it succeeds for fails. */ if ((ret = be_clone_fs_callback(zhp, &bt)) != 0) { zhp = NULL; /* Creating clone BE failed */ if (!autoname || ret != BE_ERR_BE_EXISTS) { be_print_err(gettext("be_copy: " "failed to clone new BE (%s) from " "orig BE (%s)\n"), bt.nbe_name, bt.obe_name); ret = BE_ERR_CLONE; goto done; } /* * We failed to create the new BE because a BE with * the auto-name we generated above has since come * into existence. Regenerate a new auto-name * and retry. */ for (i = 1; i < BE_AUTO_NAME_MAX_TRY; i++) { /* Sleep 1 before retrying */ (void) sleep(1); /* Generate new auto BE name */ free(bt.nbe_name); if ((bt.nbe_name = be_auto_be_name(bt.obe_name)) == NULL) { be_print_err(gettext("be_copy: " "failed to generate auto " "BE name\n")); ret = BE_ERR_AUTONAME; goto done; } /* * Regenerate string for new BE's * root dataset name */ be_make_root_ds(bt.nbe_zpool, bt.nbe_name, nbe_root_ds, sizeof (nbe_root_ds)); bt.nbe_root_ds = nbe_root_ds; /* * Get handle to original BE's root dataset. */ if ((zhp = zfs_open(g_zfs, bt.obe_root_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_copy: " "failed to open BE root dataset " "(%s): %s\n"), bt.obe_root_ds, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); goto done; } /* * Try to clone the BE again. This * call will end up closing the zfs * handle passed in whether it * succeeds or fails. */ ret = be_clone_fs_callback(zhp, &bt); zhp = NULL; if (ret == 0) { break; } else if (ret != BE_ERR_BE_EXISTS) { be_print_err(gettext("be_copy: " "failed to clone new BE " "(%s) from orig BE (%s)\n"), bt.nbe_name, bt.obe_name); ret = BE_ERR_CLONE; goto done; } } /* * If we've exhausted the maximum number of * tries, free the auto BE name and return * error. */ if (i == BE_AUTO_NAME_MAX_TRY) { be_print_err(gettext("be_copy: failed " "to create unique auto BE name\n")); free(bt.nbe_name); bt.nbe_name = NULL; ret = BE_ERR_AUTONAME; goto done; } } zhp = NULL; } else { /* Do copy (i.e. send BE datasets via zfs_send/recv) */ /* * Verify BE container dataset in nbe_zpool exists. * If not, create it. */ if (!be_create_container_ds(bt.nbe_zpool)) { ret = BE_ERR_CREATDS; goto done; } /* * Iterate through original BE's datasets and send * them to the other pool. This call will end up closing * the zfs handle passed in whether it succeeds or fails. */ if ((ret = be_send_fs_callback(zhp, &bt)) != 0) { be_print_err(gettext("be_copy: failed to " "send BE (%s) to pool (%s)\n"), bt.obe_name, bt.nbe_zpool); ret = BE_ERR_COPY; zhp = NULL; goto done; } zhp = NULL; } /* * Set flag to note that the dataset(s) for the new BE have been * successfully created so that if a failure happens from this point * on, we know to cleanup these datasets. */ be_created = B_TRUE; /* * Validate that the new BE is mountable. * Do not attempt to mount non-global zone datasets * since they are not cloned yet. */ if ((ret = _be_mount(bt.nbe_name, &new_mp, BE_MOUNT_FLAG_NO_ZONES)) != BE_SUCCESS) { be_print_err(gettext("be_copy: failed to " "mount newly created BE\n")); (void) _be_unmount(bt.nbe_name, 0); goto done; } /* Set UUID for new BE */ if (be_set_uuid(bt.nbe_root_ds) != BE_SUCCESS) { be_print_err(gettext("be_copy: failed to " "set uuid for new BE\n")); } /* * Process zones outside of the private BE namespace. * This has to be done here because we need the uuid set in the * root dataset of the new BE. The uuid is use to set the parentbe * property for the new zones datasets. */ if (getzoneid() == GLOBAL_ZONEID && be_get_uuid(bt.obe_root_ds, &uu) == BE_SUCCESS) { if ((ret = be_copy_zones(bt.obe_name, bt.obe_root_ds, bt.nbe_root_ds)) != BE_SUCCESS) { be_print_err(gettext("be_copy: failed to process " "zones\n")); goto done; } } /* * Generate a list of file systems from the original BE that are * legacy mounted. We use this list to determine which entries in * vfstab we need to update for the new BE we've just created. */ if ((ret = be_get_legacy_fs(bt.obe_name, bt.obe_root_ds, NULL, NULL, &fld)) != BE_SUCCESS) { be_print_err(gettext("be_copy: failed to " "get legacy mounted file system list for %s\n"), bt.obe_name); goto done; } /* * Update new BE's vfstab. */ if ((ret = be_update_vfstab(bt.nbe_name, bt.obe_zpool, bt.nbe_zpool, &fld, new_mp)) != BE_SUCCESS) { be_print_err(gettext("be_copy: failed to " "update new BE's vfstab (%s)\n"), bt.nbe_name); goto done; } /* Unmount the new BE */ if ((ret = _be_unmount(bt.nbe_name, 0)) != BE_SUCCESS) { be_print_err(gettext("be_copy: failed to " "unmount newly created BE\n")); goto done; } /* * Add boot menu entry for newly created clone */ if (getzoneid() == GLOBAL_ZONEID && (ret = be_append_menu(bt.nbe_name, bt.nbe_zpool, NULL, bt.obe_root_ds, bt.nbe_desc)) != BE_SUCCESS) { be_print_err(gettext("be_copy: failed to " "add BE (%s) to boot menu\n"), bt.nbe_name); goto done; } /* * If we succeeded in creating an auto named BE, set its policy * type and return the auto generated name to the caller by storing * it in the nvlist passed in by the caller. */ if (autoname) { /* Get handle to new BE's root dataset. */ if ((zhp = zfs_open(g_zfs, bt.nbe_root_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_copy: failed to " "open BE root dataset (%s): %s\n"), bt.nbe_root_ds, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); goto done; } /* * Set the policy type property into the new BE's root dataset */ if (bt.policy == NULL) { /* If no policy type provided, use default type */ bt.policy = be_default_policy(); } if (zfs_prop_set(zhp, BE_POLICY_PROPERTY, bt.policy) != 0) { be_print_err(gettext("be_copy: failed to " "set BE policy for %s: %s\n"), bt.nbe_name, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); goto done; } /* * Return the auto generated name to the caller */ if (bt.nbe_name) { if (nvlist_add_string(be_attrs, BE_ATTR_NEW_BE_NAME, bt.nbe_name) != 0) { be_print_err(gettext("be_copy: failed to " "add snap name to be_attrs\n")); } } } done: ZFS_CLOSE(zhp); be_free_fs_list(&fld); if (bt.nbe_zfs_props != NULL) nvlist_free(bt.nbe_zfs_props); free(bt.obe_altroot); free(new_mp); /* * If a failure occurred and we already created the datasets for * the new boot environment, destroy them. */ if (ret != BE_SUCCESS && be_created) { be_destroy_data_t cdd = { 0 }; cdd.force_unmount = B_TRUE; be_print_err(gettext("be_copy: " "destroying partially created boot environment\n")); if (getzoneid() == GLOBAL_ZONEID && be_get_uuid(bt.nbe_root_ds, &cdd.gz_be_uuid) == 0) (void) be_destroy_zones(bt.nbe_name, bt.nbe_root_ds, &cdd); (void) _be_destroy(bt.nbe_root_ds, &cdd); } be_zfs_fini(); return (ret); } /* ******************************************************************** */ /* Semi-Private Functions */ /* ******************************************************************** */ /* * Function: be_find_zpool_callback * Description: Callback function used to find the pool that a BE lives in. * Parameters: * zlp - zpool_handle_t pointer for the current pool being * looked at. * data - be_transaction_data_t pointer providing information * about the BE that's being searched for. * This function uses the obe_name member of this * parameter to use as the BE name to search for. * Upon successfully locating the BE, it populates * obe_zpool with the pool name that the BE is found in. * Returns: * 1 - BE exists in this pool. * 0 - BE does not exist in this pool. * Scope: * Semi-private (library wide use only) */ int be_find_zpool_callback(zpool_handle_t *zlp, void *data) { be_transaction_data_t *bt = data; const char *zpool = zpool_get_name(zlp); char be_root_ds[MAXPATHLEN]; /* * Generate string for the BE's root dataset */ be_make_root_ds(zpool, bt->obe_name, be_root_ds, sizeof (be_root_ds)); /* * Check if dataset exists */ if (zfs_dataset_exists(g_zfs, be_root_ds, ZFS_TYPE_FILESYSTEM)) { /* BE's root dataset exists in zpool */ bt->obe_zpool = strdup(zpool); zpool_close(zlp); return (1); } zpool_close(zlp); return (0); } /* * Function: be_exists_callback * Description: Callback function used to find out if a BE exists. * Parameters: * zlp - zpool_handle_t pointer to the current pool being * looked at. * data - BE name to look for. * Return: * 1 - BE exists in this pool. * 0 - BE does not exist in this pool. * Scope: * Semi-private (library wide use only) */ int be_exists_callback(zpool_handle_t *zlp, void *data) { const char *zpool = zpool_get_name(zlp); char *be_name = data; char be_root_ds[MAXPATHLEN]; /* * Generate string for the BE's root dataset */ be_make_root_ds(zpool, be_name, be_root_ds, sizeof (be_root_ds)); /* * Check if dataset exists */ if (zfs_dataset_exists(g_zfs, be_root_ds, ZFS_TYPE_FILESYSTEM)) { /* BE's root dataset exists in zpool */ zpool_close(zlp); return (1); } zpool_close(zlp); return (0); } /* * Function: be_set_uuid * Description: This function generates a uuid, unparses it into * string representation, and sets that string into * a zfs user property for a root dataset of a BE. * The name of the user property used to store the * uuid is org.opensolaris.libbe:uuid * * Parameters: * root_ds - Root dataset of the BE to set a uuid on. * Return: * be_errno_t - Failure * BE_SUCCESS - Success * Scope: * Semi-private (library wide ues only) */ int be_set_uuid(char *root_ds) { zfs_handle_t *zhp = NULL; uuid_t uu = { 0 }; char uu_string[UUID_PRINTABLE_STRING_LENGTH] = { 0 }; int ret = BE_SUCCESS; /* Generate a UUID and unparse it into string form */ uuid_generate(uu); if (uuid_is_null(uu) != 0) { be_print_err(gettext("be_set_uuid: failed to " "generate uuid\n")); return (BE_ERR_GEN_UUID); } uuid_unparse(uu, uu_string); /* Get handle to the BE's root dataset. */ if ((zhp = zfs_open(g_zfs, root_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_set_uuid: failed to " "open BE root dataset (%s): %s\n"), root_ds, libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* Set uuid property for the BE */ if (zfs_prop_set(zhp, BE_UUID_PROPERTY, uu_string) != 0) { be_print_err(gettext("be_set_uuid: failed to " "set uuid property for BE: %s\n"), libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); } ZFS_CLOSE(zhp); return (ret); } /* * Function: be_get_uuid * Description: This function gets the uuid string from a BE root * dataset, parses it into internal format, and returns * it the caller via a reference pointer passed in. * * Parameters: * rootds - Root dataset of the BE to get the uuid from. * uu - reference pointer to a uuid_t to return uuid in. * Return: * be_errno_t - Failure * BE_SUCCESS - Success * Scope: * Semi-private (library wide use only) */ int be_get_uuid(const char *root_ds, uuid_t *uu) { zfs_handle_t *zhp = NULL; nvlist_t *userprops = NULL; nvlist_t *propname = NULL; char *uu_string = NULL; int ret = BE_SUCCESS; /* Get handle to the BE's root dataset. */ if ((zhp = zfs_open(g_zfs, root_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_get_uuid: failed to " "open BE root dataset (%s): %s\n"), root_ds, libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* Get user properties for BE's root dataset */ if ((userprops = zfs_get_user_props(zhp)) == NULL) { be_print_err(gettext("be_get_uuid: failed to " "get user properties for BE root dataset (%s): %s\n"), root_ds, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); goto done; } /* Get UUID string from BE's root dataset user properties */ if (nvlist_lookup_nvlist(userprops, BE_UUID_PROPERTY, &propname) != 0 || nvlist_lookup_string(propname, ZPROP_VALUE, &uu_string) != 0) { /* * This probably just means that the BE is simply too old * to have a uuid or that we haven't created a uuid for * this BE yet. */ be_print_err(gettext("be_get_uuid: failed to " "get uuid property from BE root dataset user " "properties.\n")); ret = BE_ERR_NO_UUID; goto done; } /* Parse uuid string into internal format */ if (uuid_parse(uu_string, *uu) != 0 || uuid_is_null(*uu)) { be_print_err(gettext("be_get_uuid: failed to " "parse uuid\n")); ret = BE_ERR_PARSE_UUID; goto done; } done: ZFS_CLOSE(zhp); return (ret); } /* ******************************************************************** */ /* Private Functions */ /* ******************************************************************** */ /* * Function: _be_destroy * Description: Destroy a BE and all of its children datasets and snapshots. * This function is called for both global BEs and non-global BEs. * The root dataset of either the global BE or non-global BE to be * destroyed is passed in. * Parameters: * root_ds - pointer to the name of the root dataset of the * BE to destroy. * dd - pointer to a be_destroy_data_t structure. * * Return: * BE_SUCCESS - Success * be_errno_t - Failure * Scope: * Private */ static int _be_destroy(const char *root_ds, be_destroy_data_t *dd) { zfs_handle_t *zhp = NULL; char origin[MAXPATHLEN]; char parent[MAXPATHLEN]; char *snap = NULL; boolean_t has_origin = B_FALSE; int ret = BE_SUCCESS; /* Get handle to BE's root dataset */ if ((zhp = zfs_open(g_zfs, root_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_destroy: failed to " "open BE root dataset (%s): %s\n"), root_ds, libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* * Demote this BE in case it has dependent clones. This call * will end up closing the zfs handle passed in whether it * succeeds or fails. */ if (be_demote_callback(zhp, NULL) != 0) { be_print_err(gettext("be_destroy: " "failed to demote BE %s\n"), root_ds); return (BE_ERR_DEMOTE); } /* Get handle to BE's root dataset */ if ((zhp = zfs_open(g_zfs, root_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_destroy: failed to " "open BE root dataset (%s): %s\n"), root_ds, libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* * Get the origin of this BE's root dataset. This will be used * later to destroy the snapshots originally used to create this BE. */ if (zfs_prop_get(zhp, ZFS_PROP_ORIGIN, origin, sizeof (origin), NULL, NULL, 0, B_FALSE) == 0) { (void) strlcpy(parent, origin, sizeof (parent)); if (be_get_snap(parent, &snap) != BE_SUCCESS) { ZFS_CLOSE(zhp); be_print_err(gettext("be_destroy: failed to " "get snapshot name from origin %s\n"), origin); return (BE_ERR_INVAL); } has_origin = B_TRUE; } /* * Destroy the BE's root and its hierarchical children. This call * will end up closing the zfs handle passed in whether it succeeds * or fails. */ if (be_destroy_callback(zhp, dd) != 0) { be_print_err(gettext("be_destroy: failed to " "destroy BE %s\n"), root_ds); return (BE_ERR_DESTROY); } /* If BE has an origin */ if (has_origin) { /* * If origin snapshot doesn't have any other * dependents, delete the origin. */ if ((zhp = zfs_open(g_zfs, origin, ZFS_TYPE_SNAPSHOT)) == NULL) { be_print_err(gettext("be_destroy: failed to " "open BE's origin (%s): %s\n"), origin, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); return (ret); } /* If origin has dependents, don't delete it. */ if (zfs_prop_get_int(zhp, ZFS_PROP_NUMCLONES) != 0) { ZFS_CLOSE(zhp); return (ret); } ZFS_CLOSE(zhp); /* Get handle to BE's parent's root dataset */ if ((zhp = zfs_open(g_zfs, parent, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_destroy: failed to " "open BE's parent root dataset (%s): %s\n"), parent, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); return (ret); } /* Destroy the snapshot origin used to create this BE. */ /* * The boolean set to B_FALSE and passed to zfs_destroy_snaps() * tells zfs to process and destroy the snapshots now. * Otherwise the call will potentially return where the * snapshot isn't actually destroyed yet, and ZFS is waiting * until all the references to the snapshot have been * released before actually destroying the snapshot. */ if (zfs_destroy_snaps(zhp, snap, B_FALSE) != 0) { be_print_err(gettext("be_destroy: failed to " "destroy original snapshots used to create " "BE: %s\n"), libzfs_error_description(g_zfs)); /* * If a failure happened because a clone exists, * don't return a failure to the user. Above, we're * only checking that the root dataset's origin * snapshot doesn't have dependent clones, but its * possible that a subordinate dataset origin snapshot * has a clone. We really need to check for that * before trying to destroy the origin snapshot. */ if (libzfs_errno(g_zfs) != EZFS_EXISTS) { ret = zfs_err_to_be_err(g_zfs); ZFS_CLOSE(zhp); return (ret); } } ZFS_CLOSE(zhp); } return (ret); } /* * Function: be_destroy_zones * Description: Find valid zone's and call be_destroy_zone_roots to destroy its * corresponding dataset and all of its children datasets * and snapshots. * Parameters: * be_name - name of global boot environment being destroyed * be_root_ds - root dataset of global boot environment being * destroyed. * dd - be_destroy_data_t pointer * Return: * BE_SUCCESS - Success * be_errno_t - Failure * Scope: * Private * * NOTES - Requires that the BE being deleted has no dependent BEs. If it * does, the destroy will fail. */ static int be_destroy_zones(char *be_name, char *be_root_ds, be_destroy_data_t *dd) { int i; int ret = BE_SUCCESS; int force_umnt = BE_UNMOUNT_FLAG_NULL; char *zonepath = NULL; char *zonename = NULL; char *zonepath_ds = NULL; char *mp = NULL; zoneList_t zlist = NULL; zoneBrandList_t *brands = NULL; zfs_handle_t *zhp = NULL; /* If zones are not implemented, then get out. */ if (!z_zones_are_implemented()) { return (BE_SUCCESS); } /* Get list of supported brands */ if ((brands = be_get_supported_brandlist()) == NULL) { be_print_err(gettext("be_destroy_zones: " "no supported brands\n")); return (BE_SUCCESS); } /* Get handle to BE's root dataset */ if ((zhp = zfs_open(g_zfs, be_root_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_destroy_zones: failed to " "open BE root dataset (%s): %s\n"), be_root_ds, libzfs_error_description(g_zfs)); z_free_brand_list(brands); return (zfs_err_to_be_err(g_zfs)); } /* * If the global BE is not mounted, we must mount it here to * gather data about the non-global zones in it. */ if (!zfs_is_mounted(zhp, &mp)) { if ((ret = _be_mount(be_name, &mp, BE_MOUNT_FLAG_NO_ZONES)) != BE_SUCCESS) { be_print_err(gettext("be_destroy_zones: failed to " "mount the BE (%s) for zones processing.\n"), be_name); ZFS_CLOSE(zhp); z_free_brand_list(brands); return (ret); } } ZFS_CLOSE(zhp); z_set_zone_root(mp); free(mp); /* Get list of supported zones. */ if ((zlist = z_get_nonglobal_zone_list_by_brand(brands)) == NULL) { z_free_brand_list(brands); return (BE_SUCCESS); } /* Unmount the BE before destroying the zones in it. */ if (dd->force_unmount) force_umnt = BE_UNMOUNT_FLAG_FORCE; if ((ret = _be_unmount(be_name, force_umnt)) != BE_SUCCESS) { be_print_err(gettext("be_destroy_zones: failed to " "unmount the BE (%s)\n"), be_name); goto done; } /* Iterate through the zones and destroy them. */ for (i = 0; (zonename = z_zlist_get_zonename(zlist, i)) != NULL; i++) { /* Skip zones that aren't at least installed */ if (z_zlist_get_current_state(zlist, i) < ZONE_STATE_INSTALLED) continue; zonepath = z_zlist_get_zonepath(zlist, i); /* * Get the dataset of this zonepath. If its not * a dataset, skip it. */ if ((zonepath_ds = be_get_ds_from_dir(zonepath)) == NULL) continue; /* * Check if this zone is supported based on the * dataset of its zonepath. */ if (!be_zone_supported(zonepath_ds)) { free(zonepath_ds); continue; } /* Find the zone BE root datasets for this zone. */ if ((ret = be_destroy_zone_roots(zonepath_ds, dd)) != BE_SUCCESS) { be_print_err(gettext("be_destroy_zones: failed to " "find and destroy zone roots for zone %s\n"), zonename); free(zonepath_ds); goto done; } free(zonepath_ds); } done: z_free_brand_list(brands); z_free_zone_list(zlist); return (ret); } /* * Function: be_destroy_zone_roots * Description: This function will open the zone's root container dataset * and iterate the datasets within, looking for roots that * belong to the given global BE and destroying them. * If no other zone roots remain in the zone's root container * dataset, the function will destroy it and the zone's * zonepath dataset as well. * Parameters: * zonepath_ds - pointer to zone's zonepath dataset. * dd - pointer to a linked destroy data. * Returns: * BE_SUCCESS - Success * be_errno_t - Failure * Scope: * Private */ static int be_destroy_zone_roots(char *zonepath_ds, be_destroy_data_t *dd) { zfs_handle_t *zhp; char zone_container_ds[MAXPATHLEN]; int ret = BE_SUCCESS; /* Generate string for the root container dataset for this zone. */ be_make_container_ds(zonepath_ds, zone_container_ds, sizeof (zone_container_ds)); /* Get handle to this zone's root container dataset. */ if ((zhp = zfs_open(g_zfs, zone_container_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_destroy_zone_roots: failed to " "open zone root container dataset (%s): %s\n"), zone_container_ds, libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* * Iterate through all of this zone's BEs, destroying the ones * that belong to the parent global BE. */ if ((ret = zfs_iter_filesystems(zhp, be_destroy_zone_roots_callback, dd)) != 0) { be_print_err(gettext("be_destroy_zone_roots: failed to " "destroy zone roots under zonepath dataset %s: %s\n"), zonepath_ds, libzfs_error_description(g_zfs)); ZFS_CLOSE(zhp); return (ret); } ZFS_CLOSE(zhp); /* Get handle to this zone's root container dataset. */ if ((zhp = zfs_open(g_zfs, zone_container_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_destroy_zone_roots: failed to " "open zone root container dataset (%s): %s\n"), zone_container_ds, libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* * If there are no more zone roots in this zone's root container, * dataset, destroy it and the zonepath dataset as well. */ if (zfs_iter_filesystems(zhp, be_zone_root_exists_callback, NULL) == 0) { /* Destroy the zone root container dataset */ if (zfs_unmount(zhp, NULL, MS_FORCE) != 0 || zfs_destroy(zhp, B_FALSE) != 0) { be_print_err(gettext("be_destroy_zone_roots: failed to " "destroy zone root container dataset (%s): %s\n"), zone_container_ds, libzfs_error_description(g_zfs)); goto done; } ZFS_CLOSE(zhp); /* Get handle to zonepath dataset */ if ((zhp = zfs_open(g_zfs, zonepath_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_destroy_zone_roots: failed to " "open zonepath dataset (%s): %s\n"), zonepath_ds, libzfs_error_description(g_zfs)); goto done; } /* Destroy zonepath dataset */ if (zfs_unmount(zhp, NULL, MS_FORCE) != 0 || zfs_destroy(zhp, B_FALSE) != 0) { be_print_err(gettext("be_destroy_zone_roots: " "failed to destroy zonepath dataest %s: %s\n"), zonepath_ds, libzfs_error_description(g_zfs)); goto done; } } done: ZFS_CLOSE(zhp); return (ret); } /* * Function: be_destroy_zone_roots_callback * Description: This function is used as a callback to iterate over all of * a zone's root datasets, finding the one's that * correspond to the current BE. The name's * of the zone root datasets are then destroyed by _be_destroy(). * Parameters: * zhp - zfs_handle_t pointer to current dataset being processed * data - be_destroy_data_t pointer * Returns: * 0 - Success * be_errno_t - Failure * Scope: * Private */ static int be_destroy_zone_roots_callback(zfs_handle_t *zhp, void *data) { be_destroy_data_t *dd = data; uuid_t parent_uuid = { 0 }; int ret = 0; if (be_zone_get_parent_uuid(zfs_get_name(zhp), &parent_uuid) != BE_SUCCESS) { be_print_err(gettext("be_destroy_zone_roots_callback: " "could not get parentuuid for zone root dataset %s\n"), zfs_get_name(zhp)); ZFS_CLOSE(zhp); return (0); } if (uuid_compare(dd->gz_be_uuid, parent_uuid) == 0) { /* * Found a zone root dataset belonging to the parent * BE being destroyed. Destroy this zone BE. */ if ((ret = _be_destroy(zfs_get_name(zhp), dd)) != BE_SUCCESS) { be_print_err(gettext("be_destroy_zone_root_callback: " "failed to destroy zone root %s\n"), zfs_get_name(zhp)); ZFS_CLOSE(zhp); return (ret); } } ZFS_CLOSE(zhp); return (ret); } /* * Function: be_copy_zones * Description: Find valid zones and clone them to create their * corresponding datasets for the BE being created. * Parameters: * obe_name - name of source global BE being copied. * obe_root_ds - root dataset of source global BE being copied. * nbe_root_ds - root dataset of target global BE. * Return: * BE_SUCCESS - Success * be_errno_t - Failure * Scope: * Private */ static int be_copy_zones(char *obe_name, char *obe_root_ds, char *nbe_root_ds) { int i, num_retries; int ret = BE_SUCCESS; int iret = 0; char *zonename = NULL; char *zonepath = NULL; char *zone_be_name = NULL; char *temp_mntpt = NULL; char *new_zone_be_name = NULL; char zoneroot[MAXPATHLEN]; char zoneroot_ds[MAXPATHLEN]; char zone_container_ds[MAXPATHLEN]; char new_zoneroot_ds[MAXPATHLEN]; char ss[MAXPATHLEN]; uuid_t uu = { 0 }; char uu_string[UUID_PRINTABLE_STRING_LENGTH] = { 0 }; be_transaction_data_t bt = { 0 }; zfs_handle_t *obe_zhp = NULL; zfs_handle_t *nbe_zhp = NULL; zfs_handle_t *z_zhp = NULL; zoneList_t zlist = NULL; zoneBrandList_t *brands = NULL; boolean_t mounted_here = B_FALSE; char *snap_name = NULL; /* If zones are not implemented, then get out. */ if (!z_zones_are_implemented()) { return (BE_SUCCESS); } /* Get list of supported brands */ if ((brands = be_get_supported_brandlist()) == NULL) { be_print_err(gettext("be_copy_zones: " "no supported brands\n")); return (BE_SUCCESS); } /* Get handle to origin BE's root dataset */ if ((obe_zhp = zfs_open(g_zfs, obe_root_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_copy_zones: failed to open " "the origin BE root dataset (%s) for zones processing: " "%s\n"), obe_root_ds, libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* Get handle to newly cloned BE's root dataset */ if ((nbe_zhp = zfs_open(g_zfs, nbe_root_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_copy_zones: failed to open " "the new BE root dataset (%s): %s\n"), nbe_root_ds, libzfs_error_description(g_zfs)); ZFS_CLOSE(obe_zhp); return (zfs_err_to_be_err(g_zfs)); } /* Get the uuid of the newly cloned parent BE. */ if (be_get_uuid(zfs_get_name(nbe_zhp), &uu) != BE_SUCCESS) { be_print_err(gettext("be_copy_zones: " "failed to get uuid for BE root " "dataset %s\n"), zfs_get_name(nbe_zhp)); ZFS_CLOSE(nbe_zhp); goto done; } ZFS_CLOSE(nbe_zhp); uuid_unparse(uu, uu_string); /* * If the origin BE is not mounted, we must mount it here to * gather data about the non-global zones in it. */ if (!zfs_is_mounted(obe_zhp, &temp_mntpt)) { if ((ret = _be_mount(obe_name, &temp_mntpt, BE_MOUNT_FLAG_NULL)) != BE_SUCCESS) { be_print_err(gettext("be_copy_zones: failed to " "mount the BE (%s) for zones procesing.\n"), obe_name); goto done; } mounted_here = B_TRUE; } z_set_zone_root(temp_mntpt); /* Get list of supported zones. */ if ((zlist = z_get_nonglobal_zone_list_by_brand(brands)) == NULL) { ret = BE_SUCCESS; goto done; } for (i = 0; (zonename = z_zlist_get_zonename(zlist, i)) != NULL; i++) { be_fs_list_data_t fld = { 0 }; char zonepath_ds[MAXPATHLEN]; char *ds = NULL; /* Get zonepath of zone */ zonepath = z_zlist_get_zonepath(zlist, i); /* Skip zones that aren't at least installed */ if (z_zlist_get_current_state(zlist, i) < ZONE_STATE_INSTALLED) continue; /* * Get the dataset of this zonepath. If its not * a dataset, skip it. */ if ((ds = be_get_ds_from_dir(zonepath)) == NULL) continue; (void) strlcpy(zonepath_ds, ds, sizeof (zonepath_ds)); free(ds); ds = NULL; /* Get zoneroot directory */ be_make_zoneroot(zonepath, zoneroot, sizeof (zoneroot)); /* If zonepath dataset not supported, skip it. */ if (!be_zone_supported(zonepath_ds)) { continue; } if ((ret = be_find_active_zone_root(obe_zhp, zonepath_ds, zoneroot_ds, sizeof (zoneroot_ds))) != BE_SUCCESS) { be_print_err(gettext("be_copy_zones: " "failed to find active zone root for zone %s " "in BE %s\n"), zonename, obe_name); goto done; } be_make_container_ds(zonepath_ds, zone_container_ds, sizeof (zone_container_ds)); if ((z_zhp = zfs_open(g_zfs, zoneroot_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_copy_zones: " "failed to open zone root dataset (%s): %s\n"), zoneroot_ds, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); goto done; } zone_be_name = be_get_zone_be_name(zoneroot_ds, zone_container_ds); if ((new_zone_be_name = be_auto_zone_be_name(zone_container_ds, zone_be_name)) == NULL) { be_print_err(gettext("be_copy_zones: failed " "to generate auto name for zone BE.\n")); ret = BE_ERR_AUTONAME; goto done; } if ((snap_name = be_auto_snap_name()) == NULL) { be_print_err(gettext("be_copy_zones: failed to " "generate snapshot name for zone BE.\n")); ret = BE_ERR_AUTONAME; goto done; } (void) snprintf(ss, sizeof (ss), "%s@%s", zoneroot_ds, snap_name); if (zfs_snapshot(g_zfs, ss, B_TRUE, NULL) != 0) { be_print_err(gettext("be_copy_zones: " "failed to snapshot zone BE (%s): %s\n"), ss, libzfs_error_description(g_zfs)); if (libzfs_errno(g_zfs) == EZFS_EXISTS) ret = BE_ERR_ZONE_SS_EXISTS; else ret = zfs_err_to_be_err(g_zfs); goto done; } (void) snprintf(new_zoneroot_ds, sizeof (new_zoneroot_ds), "%s/%s", zone_container_ds, new_zone_be_name); bt.obe_name = zone_be_name; bt.obe_root_ds = zoneroot_ds; bt.obe_snap_name = snap_name; bt.obe_altroot = temp_mntpt; bt.nbe_name = new_zone_be_name; bt.nbe_root_ds = new_zoneroot_ds; if (nvlist_alloc(&bt.nbe_zfs_props, NV_UNIQUE_NAME, 0) != 0) { be_print_err(gettext("be_copy_zones: " "internal error: out of memory\n")); ret = BE_ERR_NOMEM; goto done; } /* * The call to be_clone_fs_callback always closes the * zfs_handle so there's no need to close z_zhp. */ if ((iret = be_clone_fs_callback(z_zhp, &bt)) != 0) { z_zhp = NULL; if (iret != BE_ERR_BE_EXISTS) { be_print_err(gettext("be_copy_zones: " "failed to create zone BE clone for new " "zone BE %s\n"), new_zone_be_name); ret = iret; if (bt.nbe_zfs_props != NULL) nvlist_free(bt.nbe_zfs_props); goto done; } /* * We failed to create the new zone BE because a zone * BE with the auto-name we generated above has since * come into existence. Regenerate a new auto-name * and retry. */ for (num_retries = 1; num_retries < BE_AUTO_NAME_MAX_TRY; num_retries++) { /* Sleep 1 before retrying */ (void) sleep(1); /* Generate new auto zone BE name */ free(new_zone_be_name); if ((new_zone_be_name = be_auto_zone_be_name( zone_container_ds, zone_be_name)) == NULL) { be_print_err(gettext("be_copy_zones: " "failed to generate auto name " "for zone BE.\n")); ret = BE_ERR_AUTONAME; if (bt.nbe_zfs_props != NULL) nvlist_free(bt.nbe_zfs_props); goto done; } (void) snprintf(new_zoneroot_ds, sizeof (new_zoneroot_ds), "%s/%s", zone_container_ds, new_zone_be_name); bt.nbe_name = new_zone_be_name; bt.nbe_root_ds = new_zoneroot_ds; /* * Get handle to original zone BE's root * dataset. */ if ((z_zhp = zfs_open(g_zfs, zoneroot_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_copy_zones: " "failed to open zone root " "dataset (%s): %s\n"), zoneroot_ds, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); if (bt.nbe_zfs_props != NULL) nvlist_free(bt.nbe_zfs_props); goto done; } /* * Try to clone the zone BE again. This * call will end up closing the zfs * handle passed in whether it * succeeds or fails. */ iret = be_clone_fs_callback(z_zhp, &bt); z_zhp = NULL; if (iret == 0) { break; } else if (iret != BE_ERR_BE_EXISTS) { be_print_err(gettext("be_copy_zones: " "failed to create zone BE clone " "for new zone BE %s\n"), new_zone_be_name); ret = iret; if (bt.nbe_zfs_props != NULL) nvlist_free(bt.nbe_zfs_props); goto done; } } /* * If we've exhausted the maximum number of * tries, free the auto zone BE name and return * error. */ if (num_retries == BE_AUTO_NAME_MAX_TRY) { be_print_err(gettext("be_copy_zones: failed " "to create a unique auto zone BE name\n")); free(bt.nbe_name); bt.nbe_name = NULL; ret = BE_ERR_AUTONAME; if (bt.nbe_zfs_props != NULL) nvlist_free(bt.nbe_zfs_props); goto done; } } if (bt.nbe_zfs_props != NULL) nvlist_free(bt.nbe_zfs_props); z_zhp = NULL; if ((z_zhp = zfs_open(g_zfs, new_zoneroot_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { be_print_err(gettext("be_copy_zones: " "failed to open the new zone BE root dataset " "(%s): %s\n"), new_zoneroot_ds, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); goto done; } if (zfs_prop_set(z_zhp, BE_ZONE_PARENTBE_PROPERTY, uu_string) != 0) { be_print_err(gettext("be_copy_zones: " "failed to set parentbe property\n")); ZFS_CLOSE(z_zhp); ret = zfs_err_to_be_err(g_zfs); goto done; } if (zfs_prop_set(z_zhp, BE_ZONE_ACTIVE_PROPERTY, "on") != 0) { be_print_err(gettext("be_copy_zones: " "failed to set active property\n")); ZFS_CLOSE(z_zhp); ret = zfs_err_to_be_err(g_zfs); goto done; } /* * Generate a list of file systems from the original * zone BE that are legacy mounted. We use this list * to determine which entries in the vfstab we need to * update for the new zone BE we've just created. */ if ((ret = be_get_legacy_fs(obe_name, obe_root_ds, zoneroot_ds, zoneroot, &fld)) != BE_SUCCESS) { be_print_err(gettext("be_copy_zones: " "failed to get legacy mounted file system " "list for zone %s\n"), zonename); ZFS_CLOSE(z_zhp); goto done; } /* * Update new zone BE's vfstab. */ if ((ret = be_update_zone_vfstab(z_zhp, bt.nbe_name, zonepath_ds, zonepath_ds, &fld)) != BE_SUCCESS) { be_print_err(gettext("be_copy_zones: " "failed to update new BE's vfstab (%s)\n"), bt.nbe_name); ZFS_CLOSE(z_zhp); be_free_fs_list(&fld); goto done; } be_free_fs_list(&fld); ZFS_CLOSE(z_zhp); } done: free(snap_name); if (brands != NULL) z_free_brand_list(brands); if (zlist != NULL) z_free_zone_list(zlist); if (mounted_here) (void) _be_unmount(obe_name, 0); ZFS_CLOSE(obe_zhp); return (ret); } /* * Function: be_clone_fs_callback * Description: Callback function used to iterate through a BE's filesystems * to clone them for the new BE. * Parameters: * zhp - zfs_handle_t pointer for the filesystem being processed. * data - be_transaction_data_t pointer providing information * about original BE and new BE. * Return: * 0 - Success * be_errno_t - Failure * Scope: * Private */ static int be_clone_fs_callback(zfs_handle_t *zhp, void *data) { be_transaction_data_t *bt = data; zfs_handle_t *zhp_ss = NULL; char prop_buf[MAXPATHLEN]; char zhp_name[ZFS_MAXNAMELEN]; char clone_ds[MAXPATHLEN]; char ss[MAXPATHLEN]; int ret = 0; if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, prop_buf, ZFS_MAXPROPLEN, NULL, NULL, 0, B_FALSE) != 0) { be_print_err(gettext("be_clone_fs_callback: " "failed to get dataset mountpoint (%s): %s\n"), zfs_get_name(zhp), libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); ZFS_CLOSE(zhp); return (ret); } if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED) != 0 && strcmp(prop_buf, "legacy") != 0) { /* * Since zfs can't currently handle setting the * mountpoint for a zoned dataset we'll have to skip * this dataset. This is because the mountpoint is not * set to "legacy". */ goto zoned; } /* * Get a copy of the dataset name from the zfs handle */ (void) strlcpy(zhp_name, zfs_get_name(zhp), sizeof (zhp_name)); /* * Get the clone dataset name and prepare the zfs properties for it. */ if ((ret = be_prep_clone_send_fs(zhp, bt, clone_ds, sizeof (clone_ds))) != BE_SUCCESS) { ZFS_CLOSE(zhp); return (ret); } /* * Generate the name of the snapshot to use. */ (void) snprintf(ss, sizeof (ss), "%s@%s", zhp_name, bt->obe_snap_name); /* * Get handle to snapshot. */ if ((zhp_ss = zfs_open(g_zfs, ss, ZFS_TYPE_SNAPSHOT)) == NULL) { be_print_err(gettext("be_clone_fs_callback: " "failed to get handle to snapshot (%s): %s\n"), ss, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); ZFS_CLOSE(zhp); return (ret); } /* * Clone the dataset. */ if (zfs_clone(zhp_ss, clone_ds, bt->nbe_zfs_props) != 0) { be_print_err(gettext("be_clone_fs_callback: " "failed to create clone dataset (%s): %s\n"), clone_ds, libzfs_error_description(g_zfs)); ZFS_CLOSE(zhp_ss); ZFS_CLOSE(zhp); return (zfs_err_to_be_err(g_zfs)); } ZFS_CLOSE(zhp_ss); zoned: /* * Iterate through zhp's children datasets (if any) * and clone them accordingly. */ if ((ret = zfs_iter_filesystems(zhp, be_clone_fs_callback, bt)) != 0) { /* * Error occurred while processing a child dataset. * Destroy this dataset and return error. */ zfs_handle_t *d_zhp = NULL; ZFS_CLOSE(zhp); if ((d_zhp = zfs_open(g_zfs, clone_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { return (ret); } (void) zfs_destroy(d_zhp, B_FALSE); ZFS_CLOSE(d_zhp); return (ret); } ZFS_CLOSE(zhp); return (0); } /* * Function: be_send_fs_callback * Description: Callback function used to iterate through a BE's filesystems * to copy them for the new BE. * Parameters: * zhp - zfs_handle_t pointer for the filesystem being processed. * data - be_transaction_data_t pointer providing information * about original BE and new BE. * Return: * 0 - Success * be_errnot_t - Failure * Scope: * Private */ static int be_send_fs_callback(zfs_handle_t *zhp, void *data) { be_transaction_data_t *bt = data; recvflags_t flags = { 0 }; char zhp_name[ZFS_MAXNAMELEN]; char clone_ds[MAXPATHLEN]; sendflags_t send_flags = { 0 }; int pid, status, retval; int srpipe[2]; int ret = 0; /* * Get a copy of the dataset name from the zfs handle */ (void) strlcpy(zhp_name, zfs_get_name(zhp), sizeof (zhp_name)); /* * Get the clone dataset name and prepare the zfs properties for it. */ if ((ret = be_prep_clone_send_fs(zhp, bt, clone_ds, sizeof (clone_ds))) != BE_SUCCESS) { ZFS_CLOSE(zhp); return (ret); } /* * Create the new dataset. */ if (zfs_create(g_zfs, clone_ds, ZFS_TYPE_FILESYSTEM, bt->nbe_zfs_props) != 0) { be_print_err(gettext("be_send_fs_callback: " "failed to create new dataset '%s': %s\n"), clone_ds, libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); ZFS_CLOSE(zhp); return (ret); } /* * Destination file system is already created * hence we need to set the force flag on */ flags.force = B_TRUE; /* * Initiate the pipe to be used for the send and recv */ if (pipe(srpipe) != 0) { int err = errno; be_print_err(gettext("be_send_fs_callback: failed to " "open pipe\n")); ZFS_CLOSE(zhp); return (errno_to_be_err(err)); } /* * Fork off a child to send the dataset */ if ((pid = fork()) == -1) { int err = errno; be_print_err(gettext("be_send_fs_callback: failed to fork\n")); (void) close(srpipe[0]); (void) close(srpipe[1]); ZFS_CLOSE(zhp); return (errno_to_be_err(err)); } else if (pid == 0) { /* child process */ (void) close(srpipe[0]); /* Send dataset */ if (zfs_send(zhp, NULL, bt->obe_snap_name, send_flags, srpipe[1], NULL, NULL, NULL) != 0) { _exit(1); } ZFS_CLOSE(zhp); _exit(0); } (void) close(srpipe[1]); /* Receive dataset */ if (zfs_receive(g_zfs, clone_ds, flags, srpipe[0], NULL) != 0) { be_print_err(gettext("be_send_fs_callback: failed to " "recv dataset (%s)\n"), clone_ds); } (void) close(srpipe[0]); /* wait for child to exit */ do { retval = waitpid(pid, &status, 0); if (retval == -1) { status = 0; } } while (retval != pid); if (WEXITSTATUS(status) != 0) { be_print_err(gettext("be_send_fs_callback: failed to " "send dataset (%s)\n"), zhp_name); ZFS_CLOSE(zhp); return (BE_ERR_ZFS); } /* * Iterate through zhp's children datasets (if any) * and send them accordingly. */ if ((ret = zfs_iter_filesystems(zhp, be_send_fs_callback, bt)) != 0) { /* * Error occurred while processing a child dataset. * Destroy this dataset and return error. */ zfs_handle_t *d_zhp = NULL; ZFS_CLOSE(zhp); if ((d_zhp = zfs_open(g_zfs, clone_ds, ZFS_TYPE_FILESYSTEM)) == NULL) { return (ret); } (void) zfs_destroy(d_zhp, B_FALSE); ZFS_CLOSE(d_zhp); return (ret); } ZFS_CLOSE(zhp); return (0); } /* * Function: be_destroy_callback * Description: Callback function used to destroy a BEs children datasets * and snapshots. * Parameters: * zhp - zfs_handle_t pointer to the filesystem being processed. * data - Not used. * Returns: * 0 - Success * be_errno_t - Failure * Scope: * Private */ static int be_destroy_callback(zfs_handle_t *zhp, void *data) { be_destroy_data_t *dd = data; int ret = 0; /* * Iterate down this file system's hierarchical children * and destroy them first. */ if ((ret = zfs_iter_filesystems(zhp, be_destroy_callback, dd)) != 0) { ZFS_CLOSE(zhp); return (ret); } if (dd->destroy_snaps) { /* * Iterate through this file system's snapshots and * destroy them before destroying the file system itself. */ if ((ret = zfs_iter_snapshots(zhp, be_destroy_callback, dd)) != 0) { ZFS_CLOSE(zhp); return (ret); } } /* Attempt to unmount the dataset before destroying it */ if (dd->force_unmount) { if ((ret = zfs_unmount(zhp, NULL, MS_FORCE)) != 0) { be_print_err(gettext("be_destroy_callback: " "failed to unmount %s: %s\n"), zfs_get_name(zhp), libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); ZFS_CLOSE(zhp); return (ret); } } if (zfs_destroy(zhp, B_FALSE) != 0) { be_print_err(gettext("be_destroy_callback: " "failed to destroy %s: %s\n"), zfs_get_name(zhp), libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); ZFS_CLOSE(zhp); return (ret); } ZFS_CLOSE(zhp); return (0); } /* * Function: be_demote_callback * Description: This callback function is used to iterate through the file * systems of a BE, looking for the right clone to promote such * that this file system is left without any dependent clones. * If the file system has no dependent clones, it doesn't need * to get demoted, and the function will return success. * * The demotion will be done in two passes. The first pass * will attempt to find the youngest snapshot that has a clone * that is part of some other BE. The second pass will attempt * to find the youngest snapshot that has a clone that is not * part of a BE. Doing this helps ensure the aggregated set of * file systems that compose a BE stay coordinated wrt BE * snapshots and BE dependents. It also prevents a random user * generated clone of a BE dataset to become the parent of other * BE datasets after demoting this dataset. * * Parameters: * zhp - zfs_handle_t pointer to the current file system being * processed. * data - not used. * Return: * 0 - Success * be_errno_t - Failure * Scope: * Private */ static int /* LINTED */ be_demote_callback(zfs_handle_t *zhp, void *data) { be_demote_data_t dd = { 0 }; int i, ret = 0; /* * Initialize be_demote_data for the first pass - this will find a * clone in another BE, if one exists. */ dd.find_in_BE = B_TRUE; for (i = 0; i < 2; i++) { if (zfs_iter_snapshots(zhp, be_demote_find_clone_callback, &dd) != 0) { be_print_err(gettext("be_demote_callback: " "failed to iterate snapshots for %s: %s\n"), zfs_get_name(zhp), libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); ZFS_CLOSE(zhp); return (ret); } if (dd.clone_zhp != NULL) { /* Found the clone to promote. Promote it. */ if (zfs_promote(dd.clone_zhp) != 0) { be_print_err(gettext("be_demote_callback: " "failed to promote %s: %s\n"), zfs_get_name(dd.clone_zhp), libzfs_error_description(g_zfs)); ret = zfs_err_to_be_err(g_zfs); ZFS_CLOSE(dd.clone_zhp); ZFS_CLOSE(zhp); return (ret); } ZFS_CLOSE(dd.clone_zhp); } /* * Reinitialize be_demote_data for the second pass. * This will find a user created clone outside of any BE * namespace, if one exists. */ dd.clone_zhp = NULL; dd.origin_creation = 0; dd.snapshot = NULL; dd.find_in_BE = B_FALSE; } /* Iterate down this file system's children and demote them */ if ((ret = zfs_iter_filesystems(zhp, be_demote_callback, NULL)) != 0) { ZFS_CLOSE(zhp); return (ret); } ZFS_CLOSE(zhp); return (0); } /* * Function: be_demote_find_clone_callback * Description: This callback function is used to iterate through the * snapshots of a dataset, looking for the youngest snapshot * that has a clone. If found, it returns a reference to the * clone back to the caller in the callback data. * Parameters: * zhp - zfs_handle_t pointer to current snapshot being looked at * data - be_demote_data_t pointer used to store the clone that * is found. * Returns: * 0 - Successfully iterated through all snapshots. * 1 - Failed to iterate through all snapshots. * Scope: * Private */ static int be_demote_find_clone_callback(zfs_handle_t *zhp, void *data) { be_demote_data_t *dd = data; time_t snap_creation; int zret = 0; /* If snapshot has no clones, no need to look at it */ if (zfs_prop_get_int(zhp, ZFS_PROP_NUMCLONES) == 0) { ZFS_CLOSE(zhp); return (0); } dd->snapshot = zfs_get_name(zhp); /* Get the creation time of this snapshot */ snap_creation = (time_t)zfs_prop_get_int(zhp, ZFS_PROP_CREATION); /* * If this snapshot's creation time is greater than (or younger than) * the current youngest snapshot found, iterate this snapshot to * check if it has a clone that we're looking for. */ if (snap_creation >= dd->origin_creation) { /* * Iterate the dependents of this snapshot to find a * a clone that's a direct dependent. */ if ((zret = zfs_iter_dependents(zhp, B_FALSE, be_demote_get_one_clone, dd)) == -1) { be_print_err(gettext("be_demote_find_clone_callback: " "failed to iterate dependents of %s\n"), zfs_get_name(zhp)); ZFS_CLOSE(zhp); return (1); } else if (zret == 1) { /* * Found a clone, update the origin_creation time * in the callback data. */ dd->origin_creation = snap_creation; } } ZFS_CLOSE(zhp); return (0); } /* * Function: be_demote_get_one_clone * Description: This callback function is used to iterate through a * snapshot's dependencies to find a filesystem that is a * direct clone of the snapshot being iterated. * Parameters: * zhp - zfs_handle_t pointer to current dataset being looked at * data - be_demote_data_t pointer used to store the clone * that is found, and also provides flag to note * whether or not the clone filesystem being searched * for needs to be found in a BE dataset hierarchy. * Return: * 1 - Success, found clone and its also a BE's root dataset. * 0 - Failure, clone not found. * Scope: * Private */ static int be_demote_get_one_clone(zfs_handle_t *zhp, void *data) { be_demote_data_t *dd = data; char origin[ZFS_MAXNAMELEN]; char ds_path[ZFS_MAXNAMELEN]; if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) { ZFS_CLOSE(zhp); return (0); } (void) strlcpy(ds_path, zfs_get_name(zhp), sizeof (ds_path)); /* * Make sure this is a direct clone of the snapshot * we're iterating. */ if (zfs_prop_get(zhp, ZFS_PROP_ORIGIN, origin, sizeof (origin), NULL, NULL, 0, B_FALSE) != 0) { be_print_err(gettext("be_demote_get_one_clone: " "failed to get origin of %s: %s\n"), ds_path, libzfs_error_description(g_zfs)); ZFS_CLOSE(zhp); return (0); } if (strcmp(origin, dd->snapshot) != 0) { ZFS_CLOSE(zhp); return (0); } if (dd->find_in_BE) { if ((zpool_iter(g_zfs, be_check_be_roots_callback, ds_path)) > 0) { if (dd->clone_zhp != NULL) ZFS_CLOSE(dd->clone_zhp); dd->clone_zhp = zhp; return (1); } ZFS_CLOSE(zhp); return (0); } if (dd->clone_zhp != NULL) ZFS_CLOSE(dd->clone_zhp); dd->clone_zhp = zhp; return (1); } /* * Function: be_get_snap * Description: This function takes a snapshot dataset name and separates * out the parent dataset portion from the snapshot name. * I.e. it finds the '@' in the snapshot dataset name and * replaces it with a '\0'. * Parameters: * origin - char pointer to a snapshot dataset name. Its * contents will be modified by this function. * *snap - pointer to a char pointer. Will be set to the * snapshot name portion upon success. * Return: * BE_SUCCESS - Success * 1 - Failure * Scope: * Private */ static int be_get_snap(char *origin, char **snap) { char *cp; /* * Separate out the origin's dataset and snapshot portions by * replacing the @ with a '\0' */ cp = strrchr(origin, '@'); if (cp != NULL) { if (cp[1] != NULL && cp[1] != '\0') { cp[0] = '\0'; *snap = cp+1; } else { return (1); } } else { return (1); } return (BE_SUCCESS); } /* * Function: be_create_container_ds * Description: This function checks that the zpool passed has the BE * container dataset, and if not, then creates it. * Parameters: * zpool - name of pool to create BE container dataset in. * Return: * B_TRUE - Successfully created BE container dataset, or it * already existed. * B_FALSE - Failed to create container dataset. * Scope: * Private */ static boolean_t be_create_container_ds(char *zpool) { nvlist_t *props = NULL; char be_container_ds[MAXPATHLEN]; /* Generate string for BE container dataset for this pool */ be_make_container_ds(zpool, be_container_ds, sizeof (be_container_ds)); if (!zfs_dataset_exists(g_zfs, be_container_ds, ZFS_TYPE_FILESYSTEM)) { if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0) { be_print_err(gettext("be_create_container_ds: " "nvlist_alloc failed\n")); return (B_FALSE); } if (nvlist_add_string(props, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), ZFS_MOUNTPOINT_LEGACY) != 0) { be_print_err(gettext("be_create_container_ds: " "internal error: out of memory\n")); nvlist_free(props); return (B_FALSE); } if (nvlist_add_string(props, zfs_prop_to_name(ZFS_PROP_CANMOUNT), "off") != 0) { be_print_err(gettext("be_create_container_ds: " "internal error: out of memory\n")); nvlist_free(props); return (B_FALSE); } if (zfs_create(g_zfs, be_container_ds, ZFS_TYPE_FILESYSTEM, props) != 0) { be_print_err(gettext("be_create_container_ds: " "failed to create container dataset (%s): %s\n"), be_container_ds, libzfs_error_description(g_zfs)); nvlist_free(props); return (B_FALSE); } nvlist_free(props); } return (B_TRUE); } /* * Function: be_prep_clone_send_fs * Description: This function takes a zfs handle to a dataset from the * original BE, and generates the name of the clone dataset * to create for the new BE. It also prepares the zfs * properties to be used for the new BE. * Parameters: * zhp - pointer to zfs_handle_t of the file system being * cloned/copied. * bt - be_transaction_data pointer providing information * about the original BE and new BE. * clone_ds - buffer to store the name of the dataset * for the new BE. * clone_ds_len - length of clone_ds buffer * Return: * BE_SUCCESS - Success * be_errno_t - Failure * Scope: * Private */ static int be_prep_clone_send_fs(zfs_handle_t *zhp, be_transaction_data_t *bt, char *clone_ds, int clone_ds_len) { zprop_source_t sourcetype; char source[ZFS_MAXNAMELEN]; char zhp_name[ZFS_MAXNAMELEN]; char mountpoint[MAXPATHLEN]; char *child_fs = NULL; char *zhp_mountpoint = NULL; int err = 0; /* * Get a copy of the dataset name zfs_name from zhp */ (void) strlcpy(zhp_name, zfs_get_name(zhp), sizeof (zhp_name)); /* * Get file system name relative to the root. */ if (strncmp(zhp_name, bt->obe_root_ds, strlen(bt->obe_root_ds)) == 0) { child_fs = zhp_name + strlen(bt->obe_root_ds); /* * if child_fs is NULL, this means we're processing the * root dataset itself; set child_fs to the empty string. */ if (child_fs == NULL) child_fs = ""; } else { return (BE_ERR_INVAL); } /* * Generate the name of the clone file system. */ (void) snprintf(clone_ds, clone_ds_len, "%s%s", bt->nbe_root_ds, child_fs); /* Get the mountpoint and source properties of the existing dataset */ if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint, sizeof (mountpoint), &sourcetype, source, sizeof (source), B_FALSE) != 0) { be_print_err(gettext("be_prep_clone_send_fs: " "failed to get mountpoint for (%s): %s\n"), zhp_name, libzfs_error_description(g_zfs)); return (zfs_err_to_be_err(g_zfs)); } /* * Workaround for 6668667 where a mountpoint property of "/" comes * back as "". */ if (strcmp(mountpoint, "") == 0) { (void) snprintf(mountpoint, sizeof (mountpoint), "/"); } /* * Figure out what to set as the mountpoint for the new dataset. * If the source of the mountpoint property is local, use the * mountpoint value itself. Otherwise, remove it from the * zfs properties list so that it gets inherited. */ if (sourcetype & ZPROP_SRC_LOCAL) { /* * If the BE that this file system is a part of is * currently mounted, strip off the BE altroot portion * from the mountpoint. */ zhp_mountpoint = mountpoint; if (strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) != 0 && bt->obe_altroot != NULL && strcmp(bt->obe_altroot, "/") != 0 && zfs_is_mounted(zhp, NULL)) { int altroot_len = strlen(bt->obe_altroot); if (strncmp(bt->obe_altroot, mountpoint, altroot_len) == 0) { if (mountpoint[altroot_len] == '/') zhp_mountpoint = mountpoint + altroot_len; else if (mountpoint[altroot_len] == '\0') (void) snprintf(mountpoint, sizeof (mountpoint), "/"); } } if (nvlist_add_string(bt->nbe_zfs_props, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), zhp_mountpoint) != 0) { be_print_err(gettext("be_prep_clone_send_fs: " "internal error: out of memory\n")); return (BE_ERR_NOMEM); } } else { err = nvlist_remove_all(bt->nbe_zfs_props, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT)); if (err != 0 && err != ENOENT) { be_print_err(gettext("be_prep_clone_send_fs: " "failed to remove mountpoint from " "nvlist\n")); return (BE_ERR_INVAL); } } /* * Set the 'canmount' property */ if (nvlist_add_string(bt->nbe_zfs_props, zfs_prop_to_name(ZFS_PROP_CANMOUNT), "noauto") != 0) { be_print_err(gettext("be_prep_clone_send_fs: " "internal error: out of memory\n")); return (BE_ERR_NOMEM); } return (BE_SUCCESS); } /* * Function: be_get_zone_be_name * Description: This function takes the zones root dataset, the container * dataset and returns the zones BE name based on the zone * root dataset. * Parameters: * root_ds - the zones root dataset. * container_ds - the container dataset for the zone. * Returns: * char * - the BE name of this zone based on the root dataset. */ static char * be_get_zone_be_name(char *root_ds, char *container_ds) { return (root_ds + (strlen(container_ds) + 1)); } /* * Function: be_zone_root_exists_callback * Description: This callback function is used to determine if a * zone root container dataset has any children. It always * returns 1, signifying a hierarchical child of the zone * root container dataset has been traversed and therefore * it has children. * Parameters: * zhp - zfs_handle_t pointer to current dataset being processed. * data - not used. * Returns: * 1 - dataset exists * Scope: * Private */ static int /* LINTED */ be_zone_root_exists_callback(zfs_handle_t *zhp, void *data) { ZFS_CLOSE(zhp); return (1); }