diff options
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_config.c')
| -rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_config.c | 594 |
1 files changed, 0 insertions, 594 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_config.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_config.c deleted file mode 100644 index b616a439f7b8..000000000000 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_config.c +++ /dev/null @@ -1,594 +0,0 @@ -/* - * 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright 2011 Nexenta Systems, Inc. All rights reserved. - * Copyright (c) 2011, 2018 by Delphix. All rights reserved. - * Copyright 2017 Joyent, Inc. - */ - -#include <sys/zfs_context.h> -#include <sys/spa.h> -#include <sys/fm/fs/zfs.h> -#include <sys/spa_impl.h> -#include <sys/nvpair.h> -#include <sys/uio.h> -#include <sys/fs/zfs.h> -#include <sys/vdev_impl.h> -#include <sys/zfs_ioctl.h> -#include <sys/utsname.h> -#include <sys/sunddi.h> -#include <sys/zfeature.h> -#ifdef _KERNEL -#include <sys/kobj.h> -#include <sys/zone.h> -#endif - -/* - * Pool configuration repository. - * - * Pool configuration is stored as a packed nvlist on the filesystem. By - * default, all pools are stored in /etc/zfs/zpool.cache and loaded on boot - * (when the ZFS module is loaded). Pools can also have the 'cachefile' - * property set that allows them to be stored in an alternate location until - * the control of external software. - * - * For each cache file, we have a single nvlist which holds all the - * configuration information. When the module loads, we read this information - * from /etc/zfs/zpool.cache and populate the SPA namespace. This namespace is - * maintained independently in spa.c. Whenever the namespace is modified, or - * the configuration of a pool is changed, we call spa_write_cachefile(), which - * walks through all the active pools and writes the configuration to disk. - */ - -static uint64_t spa_config_generation = 1; - -/* - * This can be overridden in userland to preserve an alternate namespace for - * userland pools when doing testing. - */ -const char *spa_config_path = ZPOOL_CACHE; - -/* - * Called when the module is first loaded, this routine loads the configuration - * file into the SPA namespace. It does not actually open or load the pools; it - * only populates the namespace. - */ -void -spa_config_load(void) -{ - void *buf = NULL; - nvlist_t *nvlist, *child; - nvpair_t *nvpair; - char *pathname; - struct _buf *file; - uint64_t fsize; - - /* - * Open the configuration file. - */ - pathname = kmem_alloc(MAXPATHLEN, KM_SLEEP); - - (void) snprintf(pathname, MAXPATHLEN, "%s", spa_config_path); - - file = kobj_open_file(pathname); - - kmem_free(pathname, MAXPATHLEN); - - if (file == (struct _buf *)-1) - return; - - if (kobj_get_filesize(file, &fsize) != 0) - goto out; - - buf = kmem_alloc(fsize, KM_SLEEP); - - /* - * Read the nvlist from the file. - */ - if (kobj_read_file(file, buf, fsize, 0) < 0) - goto out; - - /* - * Unpack the nvlist. - */ - if (nvlist_unpack(buf, fsize, &nvlist, KM_SLEEP) != 0) - goto out; - - /* - * Iterate over all elements in the nvlist, creating a new spa_t for - * each one with the specified configuration. - */ - mutex_enter(&spa_namespace_lock); - nvpair = NULL; - while ((nvpair = nvlist_next_nvpair(nvlist, nvpair)) != NULL) { - if (nvpair_type(nvpair) != DATA_TYPE_NVLIST) - continue; - - child = fnvpair_value_nvlist(nvpair); - - if (spa_lookup(nvpair_name(nvpair)) != NULL) - continue; - (void) spa_add(nvpair_name(nvpair), child, NULL); - } - mutex_exit(&spa_namespace_lock); - - nvlist_free(nvlist); - -out: - if (buf != NULL) - kmem_free(buf, fsize); - - kobj_close_file(file); -} - -static void -spa_config_clean(nvlist_t *nvl) -{ - nvlist_t **child; - nvlist_t *nvroot = NULL; - uint_t c, children; - - if (nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child, - &children) == 0) { - for (c = 0; c < children; c++) - spa_config_clean(child[c]); - } - - if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0) - spa_config_clean(nvroot); - - nvlist_remove(nvl, ZPOOL_CONFIG_VDEV_STATS, DATA_TYPE_UINT64_ARRAY); - nvlist_remove(nvl, ZPOOL_CONFIG_SCAN_STATS, DATA_TYPE_UINT64_ARRAY); -} - -static int -spa_config_write(spa_config_dirent_t *dp, nvlist_t *nvl) -{ - size_t buflen; - char *buf; - vnode_t *vp; - int oflags = FWRITE | FTRUNC | FCREAT | FOFFMAX; - char *temp; - int err; - - /* - * If the nvlist is empty (NULL), then remove the old cachefile. - */ - if (nvl == NULL) { - err = vn_remove(dp->scd_path, UIO_SYSSPACE, RMFILE); - return (err); - } - - /* - * Pack the configuration into a buffer. - */ - buf = fnvlist_pack(nvl, &buflen); - temp = kmem_zalloc(MAXPATHLEN, KM_SLEEP); - - /* - * Write the configuration to disk. We need to do the traditional - * 'write to temporary file, sync, move over original' to make sure we - * always have a consistent view of the data. - */ - (void) snprintf(temp, MAXPATHLEN, "%s.tmp", dp->scd_path); - - err = vn_open(temp, UIO_SYSSPACE, oflags, 0644, &vp, CRCREAT, 0); - if (err == 0) { - err = vn_rdwr(UIO_WRITE, vp, buf, buflen, 0, UIO_SYSSPACE, - 0, RLIM64_INFINITY, kcred, NULL); - if (err == 0) - err = VOP_FSYNC(vp, FSYNC, kcred, NULL); - if (err == 0) - err = vn_rename(temp, dp->scd_path, UIO_SYSSPACE); - (void) VOP_CLOSE(vp, oflags, 1, 0, kcred, NULL); - } - - (void) vn_remove(temp, UIO_SYSSPACE, RMFILE); - - fnvlist_pack_free(buf, buflen); - kmem_free(temp, MAXPATHLEN); - return (err); -} - -/* - * Synchronize pool configuration to disk. This must be called with the - * namespace lock held. Synchronizing the pool cache is typically done after - * the configuration has been synced to the MOS. This exposes a window where - * the MOS config will have been updated but the cache file has not. If - * the system were to crash at that instant then the cached config may not - * contain the correct information to open the pool and an explicit import - * would be required. - */ -void -spa_write_cachefile(spa_t *target, boolean_t removing, boolean_t postsysevent) -{ - spa_config_dirent_t *dp, *tdp; - nvlist_t *nvl; - boolean_t ccw_failure; - int error; - char *pool_name; - - ASSERT(MUTEX_HELD(&spa_namespace_lock)); - - if (rootdir == NULL || !(spa_mode_global & FWRITE)) - return; - - /* - * Iterate over all cachefiles for the pool, past or present. When the - * cachefile is changed, the new one is pushed onto this list, allowing - * us to update previous cachefiles that no longer contain this pool. - */ - ccw_failure = B_FALSE; - for (dp = list_head(&target->spa_config_list); dp != NULL; - dp = list_next(&target->spa_config_list, dp)) { - spa_t *spa = NULL; - if (dp->scd_path == NULL) - continue; - - /* - * Iterate over all pools, adding any matching pools to 'nvl'. - */ - nvl = NULL; - while ((spa = spa_next(spa)) != NULL) { - nvlist_t *nvroot = NULL; - /* - * Skip over our own pool if we're about to remove - * ourselves from the spa namespace or any pool that - * is readonly. Since we cannot guarantee that a - * readonly pool would successfully import upon reboot, - * we don't allow them to be written to the cache file. - */ - if ((spa == target && removing) || - (spa_state(spa) == POOL_STATE_ACTIVE && - !spa_writeable(spa))) - continue; - - mutex_enter(&spa->spa_props_lock); - tdp = list_head(&spa->spa_config_list); - if (spa->spa_config == NULL || - tdp->scd_path == NULL || - strcmp(tdp->scd_path, dp->scd_path) != 0) { - mutex_exit(&spa->spa_props_lock); - continue; - } - - if (nvl == NULL) - nvl = fnvlist_alloc(); - - if (spa->spa_import_flags & ZFS_IMPORT_TEMP_NAME) { - pool_name = fnvlist_lookup_string( - spa->spa_config, ZPOOL_CONFIG_POOL_NAME); - } else { - pool_name = spa_name(spa); - } - - fnvlist_add_nvlist(nvl, pool_name, - spa->spa_config); - mutex_exit(&spa->spa_props_lock); - - if (nvlist_lookup_nvlist(nvl, pool_name, &nvroot) == 0) - spa_config_clean(nvroot); - } - - error = spa_config_write(dp, nvl); - if (error != 0) - ccw_failure = B_TRUE; - nvlist_free(nvl); - } - - if (ccw_failure) { - /* - * Keep trying so that configuration data is - * written if/when any temporary filesystem - * resource issues are resolved. - */ - if (target->spa_ccw_fail_time == 0) { - zfs_ereport_post(FM_EREPORT_ZFS_CONFIG_CACHE_WRITE, - target, NULL, NULL, 0, 0); - } - target->spa_ccw_fail_time = gethrtime(); - spa_async_request(target, SPA_ASYNC_CONFIG_UPDATE); - } else { - /* - * Do not rate limit future attempts to update - * the config cache. - */ - target->spa_ccw_fail_time = 0; - } - - /* - * Remove any config entries older than the current one. - */ - dp = list_head(&target->spa_config_list); - while ((tdp = list_next(&target->spa_config_list, dp)) != NULL) { - list_remove(&target->spa_config_list, tdp); - if (tdp->scd_path != NULL) - spa_strfree(tdp->scd_path); - kmem_free(tdp, sizeof (spa_config_dirent_t)); - } - - spa_config_generation++; - - if (postsysevent) - spa_event_notify(target, NULL, NULL, ESC_ZFS_CONFIG_SYNC); -} - -/* - * Sigh. Inside a local zone, we don't have access to /etc/zfs/zpool.cache, - * and we don't want to allow the local zone to see all the pools anyway. - * So we have to invent the ZFS_IOC_CONFIG ioctl to grab the configuration - * information for all pool visible within the zone. - */ -nvlist_t * -spa_all_configs(uint64_t *generation) -{ - nvlist_t *pools; - spa_t *spa = NULL; - - if (*generation == spa_config_generation) - return (NULL); - - pools = fnvlist_alloc(); - - mutex_enter(&spa_namespace_lock); - while ((spa = spa_next(spa)) != NULL) { - if (INGLOBALZONE(curthread) || - zone_dataset_visible(spa_name(spa), NULL)) { - mutex_enter(&spa->spa_props_lock); - fnvlist_add_nvlist(pools, spa_name(spa), - spa->spa_config); - mutex_exit(&spa->spa_props_lock); - } - } - *generation = spa_config_generation; - mutex_exit(&spa_namespace_lock); - - return (pools); -} - -void -spa_config_set(spa_t *spa, nvlist_t *config) -{ - mutex_enter(&spa->spa_props_lock); - if (spa->spa_config != NULL && spa->spa_config != config) - nvlist_free(spa->spa_config); - spa->spa_config = config; - mutex_exit(&spa->spa_props_lock); -} - -/* - * Generate the pool's configuration based on the current in-core state. - * - * We infer whether to generate a complete config or just one top-level config - * based on whether vd is the root vdev. - */ -nvlist_t * -spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg, int getstats) -{ - nvlist_t *config, *nvroot; - vdev_t *rvd = spa->spa_root_vdev; - unsigned long hostid = 0; - boolean_t locked = B_FALSE; - uint64_t split_guid; - char *pool_name; - - if (vd == NULL) { - vd = rvd; - locked = B_TRUE; - spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); - } - - ASSERT(spa_config_held(spa, SCL_CONFIG | SCL_STATE, RW_READER) == - (SCL_CONFIG | SCL_STATE)); - - /* - * If txg is -1, report the current value of spa->spa_config_txg. - */ - if (txg == -1ULL) - txg = spa->spa_config_txg; - - /* - * Originally, users had to handle spa namespace collisions by either - * exporting the already imported pool or by specifying a new name for - * the pool with a conflicting name. In the case of root pools from - * virtual guests, neither approach to collision resolution is - * reasonable. This is addressed by extending the new name syntax with - * an option to specify that the new name is temporary. When specified, - * ZFS_IMPORT_TEMP_NAME will be set in spa->spa_import_flags to tell us - * to use the previous name, which we do below. - */ - if (spa->spa_import_flags & ZFS_IMPORT_TEMP_NAME) { - pool_name = fnvlist_lookup_string(spa->spa_config, - ZPOOL_CONFIG_POOL_NAME); - } else { - pool_name = spa_name(spa); - } - - config = fnvlist_alloc(); - - fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, spa_version(spa)); - fnvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, pool_name); - fnvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, spa_state(spa)); - fnvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG, txg); - fnvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID, spa_guid(spa)); - if (spa->spa_comment != NULL) { - fnvlist_add_string(config, ZPOOL_CONFIG_COMMENT, - spa->spa_comment); - } - - hostid = spa_get_hostid(); - if (hostid != 0) { - fnvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID, hostid); - } - fnvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME, utsname.nodename); - - int config_gen_flags = 0; - if (vd != rvd) { - fnvlist_add_uint64(config, ZPOOL_CONFIG_TOP_GUID, - vd->vdev_top->vdev_guid); - fnvlist_add_uint64(config, ZPOOL_CONFIG_GUID, - vd->vdev_guid); - if (vd->vdev_isspare) { - fnvlist_add_uint64(config, - ZPOOL_CONFIG_IS_SPARE, 1ULL); - } - if (vd->vdev_islog) { - fnvlist_add_uint64(config, - ZPOOL_CONFIG_IS_LOG, 1ULL); - } - vd = vd->vdev_top; /* label contains top config */ - } else { - /* - * Only add the (potentially large) split information - * in the mos config, and not in the vdev labels - */ - if (spa->spa_config_splitting != NULL) - fnvlist_add_nvlist(config, ZPOOL_CONFIG_SPLIT, - spa->spa_config_splitting); - fnvlist_add_boolean(config, - ZPOOL_CONFIG_HAS_PER_VDEV_ZAPS); - - config_gen_flags |= VDEV_CONFIG_MOS; - } - - /* - * Add the top-level config. We even add this on pools which - * don't support holes in the namespace. - */ - vdev_top_config_generate(spa, config); - - /* - * If we're splitting, record the original pool's guid. - */ - if (spa->spa_config_splitting != NULL && - nvlist_lookup_uint64(spa->spa_config_splitting, - ZPOOL_CONFIG_SPLIT_GUID, &split_guid) == 0) { - fnvlist_add_uint64(config, ZPOOL_CONFIG_SPLIT_GUID, - split_guid); - } - - nvroot = vdev_config_generate(spa, vd, getstats, config_gen_flags); - fnvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot); - nvlist_free(nvroot); - - /* - * Store what's necessary for reading the MOS in the label. - */ - fnvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURES_FOR_READ, - spa->spa_label_features); - - if (getstats && spa_load_state(spa) == SPA_LOAD_NONE) { - ddt_histogram_t *ddh; - ddt_stat_t *dds; - ddt_object_t *ddo; - - ddh = kmem_zalloc(sizeof (ddt_histogram_t), KM_SLEEP); - ddt_get_dedup_histogram(spa, ddh); - fnvlist_add_uint64_array(config, - ZPOOL_CONFIG_DDT_HISTOGRAM, - (uint64_t *)ddh, sizeof (*ddh) / sizeof (uint64_t)); - kmem_free(ddh, sizeof (ddt_histogram_t)); - - ddo = kmem_zalloc(sizeof (ddt_object_t), KM_SLEEP); - ddt_get_dedup_object_stats(spa, ddo); - fnvlist_add_uint64_array(config, - ZPOOL_CONFIG_DDT_OBJ_STATS, - (uint64_t *)ddo, sizeof (*ddo) / sizeof (uint64_t)); - kmem_free(ddo, sizeof (ddt_object_t)); - - dds = kmem_zalloc(sizeof (ddt_stat_t), KM_SLEEP); - ddt_get_dedup_stats(spa, dds); - fnvlist_add_uint64_array(config, - ZPOOL_CONFIG_DDT_STATS, - (uint64_t *)dds, sizeof (*dds) / sizeof (uint64_t)); - kmem_free(dds, sizeof (ddt_stat_t)); - } - - if (locked) - spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); - - return (config); -} - -/* - * Update all disk labels, generate a fresh config based on the current - * in-core state, and sync the global config cache (do not sync the config - * cache if this is a booting rootpool). - */ -void -spa_config_update(spa_t *spa, int what) -{ - vdev_t *rvd = spa->spa_root_vdev; - uint64_t txg; - int c; - - ASSERT(MUTEX_HELD(&spa_namespace_lock)); - - spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); - txg = spa_last_synced_txg(spa) + 1; - if (what == SPA_CONFIG_UPDATE_POOL) { - vdev_config_dirty(rvd); - } else { - /* - * If we have top-level vdevs that were added but have - * not yet been prepared for allocation, do that now. - * (It's safe now because the config cache is up to date, - * so it will be able to translate the new DVAs.) - * See comments in spa_vdev_add() for full details. - */ - for (c = 0; c < rvd->vdev_children; c++) { - vdev_t *tvd = rvd->vdev_child[c]; - - /* - * Explicitly skip vdevs that are indirect or - * log vdevs that are being removed. The reason - * is that both of those can have vdev_ms_array - * set to 0 and we wouldn't want to change their - * metaslab size nor call vdev_expand() on them. - */ - if (!vdev_is_concrete(tvd) || - (tvd->vdev_islog && tvd->vdev_removing)) - continue; - - if (tvd->vdev_ms_array == 0) { - vdev_ashift_optimize(tvd); - vdev_metaslab_set_size(tvd); - } - vdev_expand(tvd, txg); - } - } - spa_config_exit(spa, SCL_ALL, FTAG); - - /* - * Wait for the mosconfig to be regenerated and synced. - */ - txg_wait_synced(spa->spa_dsl_pool, txg); - - /* - * Update the global config cache to reflect the new mosconfig. - */ - spa_write_cachefile(spa, B_FALSE, what != SPA_CONFIG_UPDATE_POOL); - - if (what == SPA_CONFIG_UPDATE_POOL) - spa_config_update(spa, SPA_CONFIG_UPDATE_VDEVS); -} |