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git.proxmox.com Git - mirror_zfs.git/blob - module/zfs/spa_config.c
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 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
28 #include <sys/spa_impl.h>
29 #include <sys/nvpair.h>
31 #include <sys/fs/zfs.h>
32 #include <sys/vdev_impl.h>
33 #include <sys/zfs_ioctl.h>
34 #include <sys/utsname.h>
35 #include <sys/systeminfo.h>
36 #include <sys/sunddi.h>
43 * Pool configuration repository.
45 * Pool configuration is stored as a packed nvlist on the filesystem. By
46 * default, all pools are stored in /etc/zfs/zpool.cache and loaded on boot
47 * (when the ZFS module is loaded). Pools can also have the 'cachefile'
48 * property set that allows them to be stored in an alternate location until
49 * the control of external software.
51 * For each cache file, we have a single nvlist which holds all the
52 * configuration information. When the module loads, we read this information
53 * from /etc/zfs/zpool.cache and populate the SPA namespace. This namespace is
54 * maintained independently in spa.c. Whenever the namespace is modified, or
55 * the configuration of a pool is changed, we call spa_config_sync(), which
56 * walks through all the active pools and writes the configuration to disk.
59 static uint64_t spa_config_generation
= 1;
62 * This can be overridden in userland to preserve an alternate namespace for
63 * userland pools when doing testing.
65 const char *spa_config_path
= ZPOOL_CACHE
;
68 * Called when the module is first loaded, this routine loads the configuration
69 * file into the SPA namespace. It does not actually open or load the pools; it
70 * only populates the namespace.
76 nvlist_t
*nvlist
, *child
;
84 * Open the configuration file.
86 pathname
= kmem_alloc(MAXPATHLEN
, KM_SLEEP
);
88 (void) snprintf(pathname
, MAXPATHLEN
, "%s%s",
89 (rootdir
!= NULL
) ? "./" : "", spa_config_path
);
91 file
= kobj_open_file(pathname
);
93 kmem_free(pathname
, MAXPATHLEN
);
95 if (file
== (struct _buf
*)-1)
98 if (kobj_get_filesize(file
, &fsize
) != 0)
101 buf
= kmem_alloc(fsize
, KM_SLEEP
);
104 * Read the nvlist from the file.
106 if (kobj_read_file(file
, buf
, fsize
, 0) < 0)
112 if (nvlist_unpack(buf
, fsize
, &nvlist
, KM_SLEEP
) != 0)
116 * Iterate over all elements in the nvlist, creating a new spa_t for
117 * each one with the specified configuration.
119 mutex_enter(&spa_namespace_lock
);
121 while ((nvpair
= nvlist_next_nvpair(nvlist
, nvpair
)) != NULL
) {
123 if (nvpair_type(nvpair
) != DATA_TYPE_NVLIST
)
126 VERIFY(nvpair_value_nvlist(nvpair
, &child
) == 0);
128 if (spa_lookup(nvpair_name(nvpair
)) != NULL
)
130 spa
= spa_add(nvpair_name(nvpair
), NULL
);
133 * We blindly duplicate the configuration here. If it's
134 * invalid, we will catch it when the pool is first opened.
136 VERIFY(nvlist_dup(child
, &spa
->spa_config
, 0) == 0);
138 mutex_exit(&spa_namespace_lock
);
144 kmem_free(buf
, fsize
);
146 kobj_close_file(file
);
150 spa_config_write(spa_config_dirent_t
*dp
, nvlist_t
*nvl
)
155 int oflags
= FWRITE
| FTRUNC
| FCREAT
| FOFFMAX
;
159 * If the nvlist is empty (NULL), then remove the old cachefile.
162 (void) vn_remove(dp
->scd_path
, UIO_SYSSPACE
, RMFILE
);
167 * Pack the configuration into a buffer.
169 VERIFY(nvlist_size(nvl
, &buflen
, NV_ENCODE_XDR
) == 0);
171 buf
= kmem_alloc(buflen
, KM_SLEEP
);
172 temp
= kmem_zalloc(MAXPATHLEN
, KM_SLEEP
);
174 VERIFY(nvlist_pack(nvl
, &buf
, &buflen
, NV_ENCODE_XDR
,
178 * Write the configuration to disk. We need to do the traditional
179 * 'write to temporary file, sync, move over original' to make sure we
180 * always have a consistent view of the data.
182 (void) snprintf(temp
, MAXPATHLEN
, "%s.tmp", dp
->scd_path
);
184 if (vn_open(temp
, UIO_SYSSPACE
, oflags
, 0644, &vp
, CRCREAT
, 0) == 0) {
185 if (vn_rdwr(UIO_WRITE
, vp
, buf
, buflen
, 0, UIO_SYSSPACE
,
186 0, RLIM64_INFINITY
, kcred
, NULL
) == 0 &&
187 VOP_FSYNC(vp
, FSYNC
, kcred
, NULL
) == 0) {
188 (void) vn_rename(temp
, dp
->scd_path
, UIO_SYSSPACE
);
190 (void) VOP_CLOSE(vp
, oflags
, 1, 0, kcred
, NULL
);
194 (void) vn_remove(temp
, UIO_SYSSPACE
, RMFILE
);
196 kmem_free(buf
, buflen
);
197 kmem_free(temp
, MAXPATHLEN
);
201 * Synchronize pool configuration to disk. This must be called with the
202 * namespace lock held.
205 spa_config_sync(spa_t
*target
, boolean_t removing
, boolean_t postsysevent
)
207 spa_config_dirent_t
*dp
, *tdp
;
210 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(curproc
) ||
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);
357 hostid
= zone_get_hostid(NULL
);
360 * We're emulating the system's hostid in userland, so we can't use
363 (void) ddi_strtoul(hw_serial
, NULL
, 10, &hostid
);
366 VERIFY(nvlist_add_uint64(config
, ZPOOL_CONFIG_HOSTID
,
369 VERIFY(nvlist_add_string(config
, ZPOOL_CONFIG_HOSTNAME
,
370 utsname
.nodename
) == 0);
373 VERIFY(nvlist_add_uint64(config
, ZPOOL_CONFIG_TOP_GUID
,
374 vd
->vdev_top
->vdev_guid
) == 0);
375 VERIFY(nvlist_add_uint64(config
, ZPOOL_CONFIG_GUID
,
376 vd
->vdev_guid
) == 0);
377 if (vd
->vdev_isspare
)
378 VERIFY(nvlist_add_uint64(config
, ZPOOL_CONFIG_IS_SPARE
,
381 VERIFY(nvlist_add_uint64(config
, ZPOOL_CONFIG_IS_LOG
,
383 vd
= vd
->vdev_top
; /* label contains top config */
386 nvroot
= vdev_config_generate(spa
, vd
, getstats
, B_FALSE
, B_FALSE
);
387 VERIFY(nvlist_add_nvlist(config
, ZPOOL_CONFIG_VDEV_TREE
, nvroot
) == 0);
391 spa_config_exit(spa
, SCL_CONFIG
| SCL_STATE
, FTAG
);
397 * For a pool that's not currently a booting rootpool, update all disk labels,
398 * generate a fresh config based on the current in-core state, and sync the
399 * global config cache.
402 spa_config_update(spa_t
*spa
, int what
)
404 spa_config_update_common(spa
, what
, FALSE
);
408 * Update all disk labels, generate a fresh config based on the current
409 * in-core state, and sync the global config cache (do not sync the config
410 * cache if this is a booting rootpool).
413 spa_config_update_common(spa_t
*spa
, int what
, boolean_t isroot
)
415 vdev_t
*rvd
= spa
->spa_root_vdev
;
419 ASSERT(MUTEX_HELD(&spa_namespace_lock
));
421 spa_config_enter(spa
, SCL_ALL
, FTAG
, RW_WRITER
);
422 txg
= spa_last_synced_txg(spa
) + 1;
423 if (what
== SPA_CONFIG_UPDATE_POOL
) {
424 vdev_config_dirty(rvd
);
427 * If we have top-level vdevs that were added but have
428 * not yet been prepared for allocation, do that now.
429 * (It's safe now because the config cache is up to date,
430 * so it will be able to translate the new DVAs.)
431 * See comments in spa_vdev_add() for full details.
433 for (c
= 0; c
< rvd
->vdev_children
; c
++) {
434 vdev_t
*tvd
= rvd
->vdev_child
[c
];
435 if (tvd
->vdev_ms_array
== 0)
436 vdev_metaslab_set_size(tvd
);
437 vdev_expand(tvd
, txg
);
440 spa_config_exit(spa
, SCL_ALL
, FTAG
);
443 * Wait for the mosconfig to be regenerated and synced.
445 txg_wait_synced(spa
->spa_dsl_pool
, txg
);
448 * Update the global config cache to reflect the new mosconfig.
451 spa_config_sync(spa
, B_FALSE
, what
!= SPA_CONFIG_UPDATE_POOL
);
453 if (what
== SPA_CONFIG_UPDATE_POOL
)
454 spa_config_update_common(spa
, SPA_CONFIG_UPDATE_VDEVS
, isroot
);