4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
27 #include <sys/zfs_context.h>
29 #include <sys/spa_impl.h>
30 #include <sys/nvpair.h>
32 #include <sys/fs/zfs.h>
33 #include <sys/vdev_impl.h>
34 #include <sys/zfs_ioctl.h>
35 #include <sys/utsname.h>
36 #include <sys/sunddi.h>
42 * Pool configuration repository.
44 * Pool configuration is stored as a packed nvlist on the filesystem. By
45 * default, all pools are stored in /etc/zfs/zpool.cache and loaded on boot
46 * (when the ZFS module is loaded). Pools can also have the 'cachefile'
47 * property set that allows them to be stored in an alternate location until
48 * the control of external software.
50 * For each cache file, we have a single nvlist which holds all the
51 * configuration information. When the module loads, we read this information
52 * from /etc/zfs/zpool.cache and populate the SPA namespace. This namespace is
53 * maintained independently in spa.c. Whenever the namespace is modified, or
54 * the configuration of a pool is changed, we call spa_config_sync(), which
55 * walks through all the active pools and writes the configuration to disk.
58 static uint64_t spa_config_generation = 1;
61 * This can be overridden in userland to preserve an alternate namespace for
62 * userland pools when doing testing.
64 const char *spa_config_path = ZPOOL_CACHE;
67 * Called when the module is first loaded, this routine loads the configuration
68 * file into the SPA namespace. It does not actually open or load the pools; it
69 * only populates the namespace.
75 nvlist_t *nvlist, *child;
83 * Open the configuration file.
85 pathname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
87 (void) snprintf(pathname, MAXPATHLEN, "%s", spa_config_path);
89 file = kobj_open_file(pathname);
91 if (file == (struct _buf *)-1) {
92 ZFS_LOG(1, "Cannot open %s.", pathname);
96 if (kobj_get_filesize(file, &fsize) != 0) {
97 ZFS_LOG(1, "Cannot get size of %s.", pathname);
101 buf = kmem_alloc(fsize, KM_SLEEP);
104 * Read the nvlist from the file.
106 if (kobj_read_file(file, buf, fsize, 0) < 0) {
107 ZFS_LOG(1, "Cannot read %s.", pathname);
114 if (nvlist_unpack(buf, fsize, &nvlist, KM_SLEEP) != 0)
117 ZFS_LOG(1, "File %s loaded.", pathname);
120 * Iterate over all elements in the nvlist, creating a new spa_t for
121 * each one with the specified configuration.
123 mutex_enter(&spa_namespace_lock);
125 while ((nvpair = nvlist_next_nvpair(nvlist, nvpair)) != NULL) {
127 if (nvpair_type(nvpair) != DATA_TYPE_NVLIST)
130 VERIFY(nvpair_value_nvlist(nvpair, &child) == 0);
132 if (spa_lookup(nvpair_name(nvpair)) != NULL)
134 spa = spa_add(nvpair_name(nvpair), NULL);
137 * We blindly duplicate the configuration here. If it's
138 * invalid, we will catch it when the pool is first opened.
140 VERIFY(nvlist_dup(child, &spa->spa_config, 0) == 0);
142 mutex_exit(&spa_namespace_lock);
147 kmem_free(pathname, MAXPATHLEN);
149 kmem_free(buf, fsize);
150 if (file != (struct _buf *)-1)
151 kobj_close_file(file);
155 spa_config_write(spa_config_dirent_t *dp, nvlist_t *nvl)
157 int oflags = FWRITE | FTRUNC | FCREAT | FOFFMAX;
163 * If the nvlist is empty (NULL), then remove the old cachefile.
166 (void) vn_remove(dp->scd_path, UIO_SYSSPACE, RMFILE);
171 * Pack the configuration into a buffer.
173 VERIFY(nvlist_size(nvl, &buflen, NV_ENCODE_XDR) == 0);
175 buf = kmem_alloc(buflen, KM_SLEEP);
176 temp = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
178 VERIFY(nvlist_pack(nvl, &buf, &buflen, NV_ENCODE_XDR,
182 * Write the configuration to disk. We need to do the traditional
183 * 'write to temporary file, sync, move over original' to make sure we
184 * always have a consistent view of the data.
186 (void) snprintf(temp, MAXPATHLEN, "%s.tmp", dp->scd_path);
188 if (vn_open(temp, UIO_SYSSPACE, oflags, 0644, &vp, CRCREAT, 0) == 0) {
189 if (vn_rdwr(UIO_WRITE, vp, buf, buflen, 0, UIO_SYSSPACE,
190 0, RLIM64_INFINITY, kcred, NULL) == 0 &&
191 VOP_FSYNC(vp, FSYNC, kcred, NULL) == 0) {
192 (void) vn_rename(temp, dp->scd_path, UIO_SYSSPACE);
194 (void) VOP_CLOSE(vp, oflags, 1, 0, kcred, NULL);
197 (void) vn_remove(temp, UIO_SYSSPACE, RMFILE);
199 kmem_free(buf, buflen);
200 kmem_free(temp, MAXPATHLEN);
204 * Synchronize pool configuration to disk. This must be called with the
205 * namespace lock held.
208 spa_config_sync(spa_t *target, boolean_t removing, boolean_t postsysevent)
210 spa_config_dirent_t *dp, *tdp;
213 ASSERT(MUTEX_HELD(&spa_namespace_lock));
216 * Iterate over all cachefiles for the pool, past or present. When the
217 * cachefile is changed, the new one is pushed onto this list, allowing
218 * us to update previous cachefiles that no longer contain this pool.
220 for (dp = list_head(&target->spa_config_list); dp != NULL;
221 dp = list_next(&target->spa_config_list, dp)) {
223 if (dp->scd_path == NULL)
227 * Iterate over all pools, adding any matching pools to 'nvl'.
230 while ((spa = spa_next(spa)) != NULL) {
231 if (spa == target && removing)
234 mutex_enter(&spa->spa_props_lock);
235 tdp = list_head(&spa->spa_config_list);
236 if (spa->spa_config == NULL ||
237 tdp->scd_path == NULL ||
238 strcmp(tdp->scd_path, dp->scd_path) != 0) {
239 mutex_exit(&spa->spa_props_lock);
244 VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME,
247 VERIFY(nvlist_add_nvlist(nvl, spa->spa_name,
248 spa->spa_config) == 0);
249 mutex_exit(&spa->spa_props_lock);
252 spa_config_write(dp, nvl);
257 * Remove any config entries older than the current one.
259 dp = list_head(&target->spa_config_list);
260 while ((tdp = list_next(&target->spa_config_list, dp)) != NULL) {
261 list_remove(&target->spa_config_list, tdp);
262 if (tdp->scd_path != NULL)
263 spa_strfree(tdp->scd_path);
264 kmem_free(tdp, sizeof (spa_config_dirent_t));
267 spa_config_generation++;
270 spa_event_notify(target, NULL, ESC_ZFS_CONFIG_SYNC);
274 * Sigh. Inside a local zone, we don't have access to /etc/zfs/zpool.cache,
275 * and we don't want to allow the local zone to see all the pools anyway.
276 * So we have to invent the ZFS_IOC_CONFIG ioctl to grab the configuration
277 * information for all pool visible within the zone.
280 spa_all_configs(uint64_t *generation)
285 if (*generation == spa_config_generation)
288 VERIFY(nvlist_alloc(&pools, NV_UNIQUE_NAME, KM_SLEEP) == 0);
290 mutex_enter(&spa_namespace_lock);
291 while ((spa = spa_next(spa)) != NULL) {
292 if (INGLOBALZONE(curthread) ||
293 zone_dataset_visible(spa_name(spa), NULL)) {
294 mutex_enter(&spa->spa_props_lock);
295 VERIFY(nvlist_add_nvlist(pools, spa_name(spa),
296 spa->spa_config) == 0);
297 mutex_exit(&spa->spa_props_lock);
300 *generation = spa_config_generation;
301 mutex_exit(&spa_namespace_lock);
307 spa_config_set(spa_t *spa, nvlist_t *config)
309 mutex_enter(&spa->spa_props_lock);
310 if (spa->spa_config != NULL)
311 nvlist_free(spa->spa_config);
312 spa->spa_config = config;
313 mutex_exit(&spa->spa_props_lock);
317 * Generate the pool's configuration based on the current in-core state.
318 * We infer whether to generate a complete config or just one top-level config
319 * based on whether vd is the root vdev.
322 spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg, int getstats)
324 nvlist_t *config, *nvroot;
325 vdev_t *rvd = spa->spa_root_vdev;
326 unsigned long hostid = 0;
327 boolean_t locked = B_FALSE;
332 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER);
335 ASSERT(spa_config_held(spa, SCL_CONFIG | SCL_STATE, RW_READER) ==
336 (SCL_CONFIG | SCL_STATE));
339 * If txg is -1, report the current value of spa->spa_config_txg.
342 txg = spa->spa_config_txg;
344 VERIFY(nvlist_alloc(&config, NV_UNIQUE_NAME, KM_SLEEP) == 0);
346 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION,
347 spa_version(spa)) == 0);
348 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME,
349 spa_name(spa)) == 0);
350 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE,
351 spa_state(spa)) == 0);
352 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG,
354 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID,
355 spa_guid(spa)) == 0);
356 (void) ddi_strtoul(hw_serial, NULL, 10, &hostid);
358 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID,
361 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME,
362 utsname.nodename) == 0);
365 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TOP_GUID,
366 vd->vdev_top->vdev_guid) == 0);
367 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_GUID,
368 vd->vdev_guid) == 0);
369 if (vd->vdev_isspare)
370 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_IS_SPARE,
373 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_IS_LOG,
375 vd = vd->vdev_top; /* label contains top config */
378 nvroot = vdev_config_generate(spa, vd, getstats, B_FALSE, B_FALSE);
379 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0);
383 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG);
389 * For a pool that's not currently a booting rootpool, update all disk labels,
390 * generate a fresh config based on the current in-core state, and sync the
391 * global config cache.
394 spa_config_update(spa_t *spa, int what)
396 spa_config_update_common(spa, what, FALSE);
400 * Update all disk labels, generate a fresh config based on the current
401 * in-core state, and sync the global config cache (do not sync the config
402 * cache if this is a booting rootpool).
405 spa_config_update_common(spa_t *spa, int what, boolean_t isroot)
407 vdev_t *rvd = spa->spa_root_vdev;
411 ASSERT(MUTEX_HELD(&spa_namespace_lock));
413 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
414 txg = spa_last_synced_txg(spa) + 1;
415 if (what == SPA_CONFIG_UPDATE_POOL) {
416 vdev_config_dirty(rvd);
419 * If we have top-level vdevs that were added but have
420 * not yet been prepared for allocation, do that now.
421 * (It's safe now because the config cache is up to date,
422 * so it will be able to translate the new DVAs.)
423 * See comments in spa_vdev_add() for full details.
425 for (c = 0; c < rvd->vdev_children; c++) {
426 vdev_t *tvd = rvd->vdev_child[c];
427 if (tvd->vdev_ms_array == 0) {
429 vdev_config_dirty(tvd);
433 spa_config_exit(spa, SCL_ALL, FTAG);
436 * Wait for the mosconfig to be regenerated and synced.
438 txg_wait_synced(spa->spa_dsl_pool, txg);
441 * Update the global config cache to reflect the new mosconfig.
444 spa_config_sync(spa, B_FALSE, what != SPA_CONFIG_UPDATE_POOL);
446 if (what == SPA_CONFIG_UPDATE_POOL)
447 spa_config_update_common(spa, SPA_CONFIG_UPDATE_VDEVS, isroot);