/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (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 2005 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #include #include /* * Pool configuration repository. * * The configuration for all pools, in addition to being stored on disk, is * stored in /kernel/drv/zpool.cache as a packed nvlist. The kernel maintains * this list as pools are created, destroyed, or modified. * * We have a single nvlist which holds all the configuration information. When * the module loads, we read this information from the 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) { vnode_t *vp; void *buf = NULL; vattr_t vattr; ssize_t resid; nvlist_t *nvlist, *child; nvpair_t *nvpair; spa_t *spa; char pathname[128]; /* * Open the configuration file. */ (void) snprintf(pathname, sizeof (pathname), "./%s/%s", spa_config_dir, ZPOOL_CACHE_FILE); if (vn_openat(pathname, UIO_SYSSPACE, FREAD | FOFFMAX, 0, &vp, 0, 0, rootdir) != 0) return; /* * Read the nvlist from the file. */ if (VOP_GETATTR(vp, &vattr, 0, kcred) != 0) goto out; buf = kmem_alloc(vattr.va_size, KM_SLEEP); if (vn_rdwr(UIO_READ, vp, buf, vattr.va_size, 0, UIO_SYSSPACE, 0, RLIM64_INFINITY, kcred, &resid) != 0) goto out; if (resid != 0) goto out; /* * Unpack the nvlist. */ if (nvlist_unpack(buf, vattr.va_size, &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)); /* * 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, vattr.va_size); (void) VOP_CLOSE(vp, FREAD | FOFFMAX, 1, 0, kcred); VN_RELE(vp); } /* * Synchronize all pools to disk. This must be called with the namespace lock * held. */ void spa_config_sync(void) { spa_t *spa = NULL; nvlist_t *config; size_t buflen; char *buf; vnode_t *vp; int oflags = FWRITE | FTRUNC | FCREAT | FOFFMAX; char pathname[128]; char pathname2[128]; ASSERT(MUTEX_HELD(&spa_namespace_lock)); VERIFY(nvlist_alloc(&config, NV_UNIQUE_NAME, 0) == 0); /* * Add all known pools to the configuration list, ignoring those with * alternate root paths. */ spa = NULL; while ((spa = spa_next(spa)) != NULL) { mutex_enter(&spa->spa_config_cache_lock); if (spa->spa_config && spa->spa_name && spa->spa_root == NULL) VERIFY(nvlist_add_nvlist(config, spa->spa_name, spa->spa_config) == 0); mutex_exit(&spa->spa_config_cache_lock); } /* * 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, 0) == 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", spa_config_dir, ZPOOL_CACHE_TMP); 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) == 0) { (void) snprintf(pathname2, sizeof (pathname2), "%s/%s", spa_config_dir, ZPOOL_CACHE_FILE); (void) vn_rename(pathname, pathname2, UIO_SYSSPACE); } (void) VOP_CLOSE(vp, oflags, 1, 0, kcred); VN_RELE(vp); out: (void) vn_remove(pathname, UIO_SYSSPACE, RMFILE); spa_config_generation++; kmem_free(buf, buflen); nvlist_free(config); } /* * Sigh. Inside a local zone, we don't have access to /kernel/drv/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, 0) == 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; if (vd == NULL) vd = rvd; /* * If txg is -1, report the current value of spa->spa_config_txg. * If txg is any other non-zero value, update spa->spa_config_txg. */ if (txg == -1ULL) txg = spa->spa_config_txg; else if (txg != 0 && vd == rvd) spa->spa_config_txg = txg; VERIFY(nvlist_alloc(&config, NV_UNIQUE_NAME, 0) == 0); VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, UBERBLOCK_VERSION) == 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); 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); vd = vd->vdev_top; /* label contains top config */ } nvroot = vdev_config_generate(vd, getstats); VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); nvlist_free(nvroot); return (config); }