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-rw-r--r--uts/common/fs/zfs/spa_config.c487
1 files changed, 487 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/spa_config.c b/uts/common/fs/zfs/spa_config.c
new file mode 100644
index 000000000000..69d57f66dbb6
--- /dev/null
+++ b/uts/common/fs/zfs/spa_config.c
@@ -0,0 +1,487 @@
+/*
+ * 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.
+ */
+
+#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>
+#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_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_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%s",
+ (rootdir != NULL) ? "./" : "", 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;
+
+ VERIFY(nvpair_value_nvlist(nvpair, &child) == 0);
+
+ 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_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;
+
+ /*
+ * If the nvlist is empty (NULL), then remove the old cachefile.
+ */
+ if (nvl == NULL) {
+ (void) vn_remove(dp->scd_path, UIO_SYSSPACE, RMFILE);
+ return;
+ }
+
+ /*
+ * Pack the configuration into a buffer.
+ */
+ VERIFY(nvlist_size(nvl, &buflen, NV_ENCODE_XDR) == 0);
+
+ buf = kmem_alloc(buflen, KM_SLEEP);
+ temp = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
+
+ VERIFY(nvlist_pack(nvl, &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(temp, MAXPATHLEN, "%s.tmp", dp->scd_path);
+
+ if (vn_open(temp, UIO_SYSSPACE, oflags, 0644, &vp, CRCREAT, 0) == 0) {
+ 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) vn_rename(temp, dp->scd_path, UIO_SYSSPACE);
+ }
+ (void) VOP_CLOSE(vp, oflags, 1, 0, kcred, NULL);
+ VN_RELE(vp);
+ }
+
+ (void) vn_remove(temp, UIO_SYSSPACE, RMFILE);
+
+ kmem_free(buf, buflen);
+ kmem_free(temp, MAXPATHLEN);
+}
+
+/*
+ * Synchronize pool configuration to disk. This must be called with the
+ * namespace lock held.
+ */
+void
+spa_config_sync(spa_t *target, boolean_t removing, boolean_t postsysevent)
+{
+ spa_config_dirent_t *dp, *tdp;
+ nvlist_t *nvl;
+
+ 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.
+ */
+ 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) {
+ if (spa == target && removing)
+ 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)
+ VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME,
+ KM_SLEEP) == 0);
+
+ VERIFY(nvlist_add_nvlist(nvl, spa->spa_name,
+ spa->spa_config) == 0);
+ mutex_exit(&spa->spa_props_lock);
+ }
+
+ spa_config_write(dp, nvl);
+ nvlist_free(nvl);
+ }
+
+ /*
+ * 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, 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);
+
+ VERIFY(nvlist_alloc(&pools, NV_UNIQUE_NAME, KM_SLEEP) == 0);
+
+ 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_props_lock);
+ VERIFY(nvlist_add_nvlist(pools, spa_name(spa),
+ spa->spa_config) == 0);
+ 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)
+ 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;
+
+ 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;
+
+ 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);
+#ifdef _KERNEL
+ hostid = zone_get_hostid(NULL);
+#else /* _KERNEL */
+ /*
+ * We're emulating the system's hostid in userland, so we can't use
+ * zone_get_hostid().
+ */
+ (void) ddi_strtoul(hw_serial, NULL, 10, &hostid);
+#endif /* _KERNEL */
+ 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 */
+ } else {
+ /*
+ * Only add the (potentially large) split information
+ * in the mos config, and not in the vdev labels
+ */
+ if (spa->spa_config_splitting != NULL)
+ VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_SPLIT,
+ spa->spa_config_splitting) == 0);
+ }
+
+ /*
+ * 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) {
+ VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_SPLIT_GUID,
+ split_guid) == 0);
+ }
+
+ nvroot = vdev_config_generate(spa, vd, getstats, 0);
+ VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0);
+ nvlist_free(nvroot);
+
+ 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);
+ VERIFY(nvlist_add_uint64_array(config,
+ ZPOOL_CONFIG_DDT_HISTOGRAM,
+ (uint64_t *)ddh, sizeof (*ddh) / sizeof (uint64_t)) == 0);
+ kmem_free(ddh, sizeof (ddt_histogram_t));
+
+ ddo = kmem_zalloc(sizeof (ddt_object_t), KM_SLEEP);
+ ddt_get_dedup_object_stats(spa, ddo);
+ VERIFY(nvlist_add_uint64_array(config,
+ ZPOOL_CONFIG_DDT_OBJ_STATS,
+ (uint64_t *)ddo, sizeof (*ddo) / sizeof (uint64_t)) == 0);
+ kmem_free(ddo, sizeof (ddt_object_t));
+
+ dds = kmem_zalloc(sizeof (ddt_stat_t), KM_SLEEP);
+ ddt_get_dedup_stats(spa, dds);
+ VERIFY(nvlist_add_uint64_array(config,
+ ZPOOL_CONFIG_DDT_STATS,
+ (uint64_t *)dds, sizeof (*dds) / sizeof (uint64_t)) == 0);
+ 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];
+ if (tvd->vdev_ms_array == 0)
+ 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.
+ */
+ if (!spa->spa_is_root)
+ spa_config_sync(spa, B_FALSE, what != SPA_CONFIG_UPDATE_POOL);
+
+ if (what == SPA_CONFIG_UPDATE_POOL)
+ spa_config_update(spa, SPA_CONFIG_UPDATE_VDEVS);
+}