diff options
Diffstat (limited to 'zfs/lib/libzpool/spa_config.c')
| -rw-r--r-- | zfs/lib/libzpool/spa_config.c | 492 |
1 files changed, 492 insertions, 0 deletions
diff --git a/zfs/lib/libzpool/spa_config.c b/zfs/lib/libzpool/spa_config.c new file mode 100644 index 000000000..c22e5e89d --- /dev/null +++ b/zfs/lib/libzpool/spa_config.c @@ -0,0 +1,492 @@ +/* + * 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 2008 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#pragma ident "@(#)spa_config.c 1.15 08/04/01 SMI" + +#include <sys/spa.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/systeminfo.h> +#include <sys/sunddi.h> +#ifdef _KERNEL +#include <sys/kobj.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_config_sync(), 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_dir = ZPOOL_CACHE_DIR; + +/* + * 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; + spa_t *spa; + char pathname[128]; + struct _buf *file; + uint64_t fsize; + + /* + * Open the configuration file. + */ + (void) snprintf(pathname, sizeof (pathname), "%s%s/%s", + (rootdir != NULL) ? "./" : "", spa_config_dir, ZPOOL_CACHE_FILE); + + file = kobj_open_file(pathname); + 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; + + VERIFY(nvpair_value_nvlist(nvpair, &child) == 0); + + if (spa_lookup(nvpair_name(nvpair)) != NULL) + continue; + spa = spa_add(nvpair_name(nvpair), NULL); + + /* + * We blindly duplicate the configuration here. If it's + * invalid, we will catch it when the pool is first opened. + */ + VERIFY(nvlist_dup(child, &spa->spa_config, 0) == 0); + } + mutex_exit(&spa_namespace_lock); + + nvlist_free(nvlist); + +out: + if (buf != NULL) + kmem_free(buf, fsize); + + kobj_close_file(file); +} + +/* + * This function is called when destroying or exporting a pool. It walks the + * list of active pools, and searches for any that match the given cache file. + * If there is only one cachefile, then the file is removed immediately, + * because we won't see the pool when iterating in spa_config_sync(). + */ +void +spa_config_check(const char *dir, const char *file) +{ + size_t count = 0; + char pathname[128]; + spa_t *spa; + + if (dir != NULL && strcmp(dir, "none") == 0) + return; + + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + spa = NULL; + while ((spa = spa_next(spa)) != NULL) { + if (dir == NULL) { + if (spa->spa_config_dir == NULL) + count++; + } else { + if (spa->spa_config_dir && + strcmp(spa->spa_config_dir, dir) == 0 && + strcmp(spa->spa_config_file, file) == 0) + count++; + } + } + + if (count == 1) { + if (dir == NULL) { + dir = spa_config_dir; + file = ZPOOL_CACHE_FILE; + } + + (void) snprintf(pathname, sizeof (pathname), + "%s/%s", dir, file); + (void) vn_remove(pathname, UIO_SYSSPACE, RMFILE); + } +} + +typedef struct spa_config_entry { + list_t sc_link; + const char *sc_dir; + const char *sc_file; + nvlist_t *sc_nvl; +} spa_config_entry_t; + +static void +spa_config_entry_add(list_t *listp, spa_t *spa) +{ + spa_config_entry_t *entry; + const char *dir, *file; + + mutex_enter(&spa->spa_config_cache_lock); + if (!spa->spa_config || !spa->spa_name) { + mutex_exit(&spa->spa_config_cache_lock); + return; + } + + if (spa->spa_config_dir) { + dir = spa->spa_config_dir; + file = spa->spa_config_file; + } else { + dir = spa_config_dir; + file = ZPOOL_CACHE_FILE; + } + + if (strcmp(dir, "none") == 0) { + mutex_exit(&spa->spa_config_cache_lock); + return; + } + + for (entry = list_head(listp); entry != NULL; + entry = list_next(listp, entry)) { + if (strcmp(entry->sc_dir, dir) == 0 && + strcmp(entry->sc_file, file) == 0) + break; + } + + if (entry == NULL) { + entry = kmem_alloc(sizeof (spa_config_entry_t), KM_SLEEP); + entry->sc_dir = dir; + entry->sc_file = file; + VERIFY(nvlist_alloc(&entry->sc_nvl, NV_UNIQUE_NAME, + KM_SLEEP) == 0); + list_insert_tail(listp, entry); + } + + VERIFY(nvlist_add_nvlist(entry->sc_nvl, spa->spa_name, + spa->spa_config) == 0); + mutex_exit(&spa->spa_config_cache_lock); +} + +static void +spa_config_entry_write(spa_config_entry_t *entry) +{ + nvlist_t *config = entry->sc_nvl; + size_t buflen; + char *buf; + vnode_t *vp; + int oflags = FWRITE | FTRUNC | FCREAT | FOFFMAX; + char pathname[128]; + char pathname2[128]; + + /* + * Pack the configuration into a buffer. + */ + VERIFY(nvlist_size(config, &buflen, NV_ENCODE_XDR) == 0); + + buf = kmem_alloc(buflen, KM_SLEEP); + + VERIFY(nvlist_pack(config, &buf, &buflen, NV_ENCODE_XDR, + KM_SLEEP) == 0); + + /* + * 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(pathname, sizeof (pathname), "%s/.%s", entry->sc_dir, + entry->sc_file); + + if (vn_open(pathname, UIO_SYSSPACE, oflags, 0644, &vp, CRCREAT, 0) != 0) + goto out; + + if (vn_rdwr(UIO_WRITE, vp, buf, buflen, 0, UIO_SYSSPACE, + 0, RLIM64_INFINITY, kcred, NULL) == 0 && + VOP_FSYNC(vp, FSYNC, kcred, NULL) == 0) { + (void) snprintf(pathname2, sizeof (pathname2), "%s/%s", + entry->sc_dir, entry->sc_file); + (void) vn_rename(pathname, pathname2, UIO_SYSSPACE); + } + + (void) VOP_CLOSE(vp, oflags, 1, 0, kcred, NULL); + VN_RELE(vp); + +out: + (void) vn_remove(pathname, UIO_SYSSPACE, RMFILE); + kmem_free(buf, buflen); +} + +/* + * Synchronize all pools to disk. This must be called with the namespace lock + * held. + */ +void +spa_config_sync(void) +{ + spa_t *spa = NULL; + list_t files = { 0 }; + spa_config_entry_t *entry; + + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + + list_create(&files, sizeof (spa_config_entry_t), + offsetof(spa_config_entry_t, sc_link)); + + /* + * Add all known pools to the configuration list, ignoring those with + * alternate root paths. + */ + spa = NULL; + while ((spa = spa_next(spa)) != NULL) + spa_config_entry_add(&files, spa); + + while ((entry = list_head(&files)) != NULL) { + spa_config_entry_write(entry); + list_remove(&files, entry); + nvlist_free(entry->sc_nvl); + kmem_free(entry, sizeof (spa_config_entry_t)); + } + + spa_config_generation++; +} + +/* + * 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; + + if (*generation == spa_config_generation) + return (NULL); + + VERIFY(nvlist_alloc(&pools, NV_UNIQUE_NAME, KM_SLEEP) == 0); + + spa = NULL; + mutex_enter(&spa_namespace_lock); + while ((spa = spa_next(spa)) != NULL) { + if (INGLOBALZONE(curproc) || + zone_dataset_visible(spa_name(spa), NULL)) { + mutex_enter(&spa->spa_config_cache_lock); + VERIFY(nvlist_add_nvlist(pools, spa_name(spa), + spa->spa_config) == 0); + mutex_exit(&spa->spa_config_cache_lock); + } + } + mutex_exit(&spa_namespace_lock); + + *generation = spa_config_generation; + + return (pools); +} + +void +spa_config_set(spa_t *spa, nvlist_t *config) +{ + mutex_enter(&spa->spa_config_cache_lock); + if (spa->spa_config != NULL) + nvlist_free(spa->spa_config); + spa->spa_config = config; + mutex_exit(&spa->spa_config_cache_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; + + ASSERT(spa_config_held(spa, RW_READER) || + spa_config_held(spa, RW_WRITER)); + + if (vd == NULL) + vd = rvd; + + /* + * If txg is -1, report the current value of spa->spa_config_txg. + */ + if (txg == -1ULL) + txg = spa->spa_config_txg; + + VERIFY(nvlist_alloc(&config, NV_UNIQUE_NAME, KM_SLEEP) == 0); + + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, + spa_version(spa)) == 0); + VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, + spa_name(spa)) == 0); + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, + spa_state(spa)) == 0); + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG, + txg) == 0); + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID, + spa_guid(spa)) == 0); + (void) ddi_strtoul(hw_serial, NULL, 10, &hostid); + if (hostid != 0) { + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID, + hostid) == 0); + } + VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME, + utsname.nodename) == 0); + + if (vd != rvd) { + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TOP_GUID, + vd->vdev_top->vdev_guid) == 0); + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_GUID, + vd->vdev_guid) == 0); + if (vd->vdev_isspare) + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_IS_SPARE, + 1ULL) == 0); + if (vd->vdev_islog) + VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_IS_LOG, + 1ULL) == 0); + vd = vd->vdev_top; /* label contains top config */ + } + + nvroot = vdev_config_generate(spa, vd, getstats, B_FALSE, B_FALSE); + VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); + nvlist_free(nvroot); + + return (config); +} + +/* + * For a pool that's not currently a booting rootpool, update all disk labels, + * generate a fresh config based on the current in-core state, and sync the + * global config cache. + */ +void +spa_config_update(spa_t *spa, int what) +{ + spa_config_update_common(spa, what, FALSE); +} + +/* + * 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_common(spa_t *spa, int what, boolean_t isroot) +{ + vdev_t *rvd = spa->spa_root_vdev; + uint64_t txg; + int c; + + ASSERT(MUTEX_HELD(&spa_namespace_lock)); + + spa_config_enter(spa, RW_WRITER, FTAG); + 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]; + if (tvd->vdev_ms_array == 0) { + vdev_init(tvd, txg); + vdev_config_dirty(tvd); + } + } + } + spa_config_exit(spa, 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. + */ + if (!isroot) + spa_config_sync(); + + if (what == SPA_CONFIG_UPDATE_POOL) + spa_config_update_common(spa, SPA_CONFIG_UPDATE_VDEVS, isroot); +} |