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
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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 (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011, 2014 by Delphix. All rights reserved.
28 #include <sys/spa_impl.h>
30 #include <sys/dsl_synctask.h>
31 #include <sys/dmu_tx.h>
32 #include <sys/dmu_objset.h>
33 #include <sys/dsl_dataset.h>
34 #include <sys/dsl_dir.h>
35 #include <sys/cmn_err.h>
36 #include <sys/sunddi.h>
38 #include "zfs_comutil.h"
44 * Routines to manage the on-disk history log.
46 * The history log is stored as a dmu object containing
47 * <packed record length, record nvlist> tuples.
49 * Where "record nvlist" is a nvlist containing uint64_ts and strings, and
50 * "packed record length" is the packed length of the "record nvlist" stored
51 * as a little endian uint64_t.
53 * The log is implemented as a ring buffer, though the original creation
54 * of the pool ('zpool create') is never overwritten.
56 * The history log is tracked as object 'spa_t::spa_history'. The bonus buffer
57 * of 'spa_history' stores the offsets for logging/retrieving history as
58 * 'spa_history_phys_t'. 'sh_pool_create_len' is the ending offset in bytes of
59 * where the 'zpool create' record is stored. This allows us to never
60 * overwrite the original creation of the pool. 'sh_phys_max_off' is the
61 * physical ending offset in bytes of the log. This tells you the length of
62 * the buffer. 'sh_eof' is the logical EOF (in bytes). Whenever a record
63 * is added, 'sh_eof' is incremented by the the size of the record.
64 * 'sh_eof' is never decremented. 'sh_bof' is the logical BOF (in bytes).
65 * This is where the consumer should start reading from after reading in
66 * the 'zpool create' portion of the log.
68 * 'sh_records_lost' keeps track of how many records have been overwritten
69 * and permanently lost.
72 /* convert a logical offset to physical */
74 spa_history_log_to_phys(uint64_t log_off, spa_history_phys_t *shpp)
78 phys_len = shpp->sh_phys_max_off - shpp->sh_pool_create_len;
79 return ((log_off - shpp->sh_pool_create_len) % phys_len
80 + shpp->sh_pool_create_len);
84 spa_history_create_obj(spa_t *spa, dmu_tx_t *tx)
87 spa_history_phys_t *shpp;
88 objset_t *mos = spa->spa_meta_objset;
90 ASSERT(spa->spa_history == 0);
91 spa->spa_history = dmu_object_alloc(mos, DMU_OT_SPA_HISTORY,
92 SPA_OLD_MAXBLOCKSIZE, DMU_OT_SPA_HISTORY_OFFSETS,
93 sizeof (spa_history_phys_t), tx);
95 VERIFY(zap_add(mos, DMU_POOL_DIRECTORY_OBJECT,
96 DMU_POOL_HISTORY, sizeof (uint64_t), 1,
97 &spa->spa_history, tx) == 0);
99 VERIFY(0 == dmu_bonus_hold(mos, spa->spa_history, FTAG, &dbp));
100 ASSERT(dbp->db_size >= sizeof (spa_history_phys_t));
103 dmu_buf_will_dirty(dbp, tx);
106 * Figure out maximum size of history log. We set it at
107 * 0.1% of pool size, with a max of 1G and min of 128KB.
109 shpp->sh_phys_max_off =
110 metaslab_class_get_dspace(spa_normal_class(spa)) / 1000;
111 shpp->sh_phys_max_off = MIN(shpp->sh_phys_max_off, 1<<30);
112 shpp->sh_phys_max_off = MAX(shpp->sh_phys_max_off, 128<<10);
114 dmu_buf_rele(dbp, FTAG);
118 * Change 'sh_bof' to the beginning of the next record.
121 spa_history_advance_bof(spa_t *spa, spa_history_phys_t *shpp)
123 objset_t *mos = spa->spa_meta_objset;
124 uint64_t firstread, reclen, phys_bof;
125 char buf[sizeof (reclen)];
128 phys_bof = spa_history_log_to_phys(shpp->sh_bof, shpp);
129 firstread = MIN(sizeof (reclen), shpp->sh_phys_max_off - phys_bof);
131 if ((err = dmu_read(mos, spa->spa_history, phys_bof, firstread,
132 buf, DMU_READ_PREFETCH)) != 0)
134 if (firstread != sizeof (reclen)) {
135 if ((err = dmu_read(mos, spa->spa_history,
136 shpp->sh_pool_create_len, sizeof (reclen) - firstread,
137 buf + firstread, DMU_READ_PREFETCH)) != 0)
141 reclen = LE_64(*((uint64_t *)buf));
142 shpp->sh_bof += reclen + sizeof (reclen);
143 shpp->sh_records_lost++;
148 spa_history_write(spa_t *spa, void *buf, uint64_t len, spa_history_phys_t *shpp,
151 uint64_t firstwrite, phys_eof;
152 objset_t *mos = spa->spa_meta_objset;
155 ASSERT(MUTEX_HELD(&spa->spa_history_lock));
157 /* see if we need to reset logical BOF */
158 while (shpp->sh_phys_max_off - shpp->sh_pool_create_len -
159 (shpp->sh_eof - shpp->sh_bof) <= len) {
160 if ((err = spa_history_advance_bof(spa, shpp)) != 0) {
165 phys_eof = spa_history_log_to_phys(shpp->sh_eof, shpp);
166 firstwrite = MIN(len, shpp->sh_phys_max_off - phys_eof);
168 dmu_write(mos, spa->spa_history, phys_eof, firstwrite, buf, tx);
172 /* write out the rest at the beginning of physical file */
173 dmu_write(mos, spa->spa_history, shpp->sh_pool_create_len,
174 len, (char *)buf + firstwrite, tx);
181 spa_history_zone(void)
187 return (curproc->p_zone->zone_name);
195 * Write out a history event.
199 spa_history_log_sync(void *arg, dmu_tx_t *tx)
202 spa_t *spa = dmu_tx_pool(tx)->dp_spa;
203 objset_t *mos = spa->spa_meta_objset;
205 spa_history_phys_t *shpp;
208 char *record_packed = NULL;
212 * If we have an older pool that doesn't have a command
213 * history object, create it now.
215 mutex_enter(&spa->spa_history_lock);
216 if (!spa->spa_history)
217 spa_history_create_obj(spa, tx);
218 mutex_exit(&spa->spa_history_lock);
221 * Get the offset of where we need to write via the bonus buffer.
222 * Update the offset when the write completes.
224 VERIFY0(dmu_bonus_hold(mos, spa->spa_history, FTAG, &dbp));
227 dmu_buf_will_dirty(dbp, tx);
231 dmu_object_info_t doi;
232 dmu_object_info_from_db(dbp, &doi);
233 ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_SPA_HISTORY_OFFSETS);
237 fnvlist_add_uint64(nvl, ZPOOL_HIST_TIME, gethrestime_sec());
238 fnvlist_add_string(nvl, ZPOOL_HIST_HOST, utsname()->nodename);
240 if (nvlist_exists(nvl, ZPOOL_HIST_CMD)) {
241 zfs_dbgmsg("command: %s",
242 fnvlist_lookup_string(nvl, ZPOOL_HIST_CMD));
243 } else if (nvlist_exists(nvl, ZPOOL_HIST_INT_NAME)) {
244 if (nvlist_exists(nvl, ZPOOL_HIST_DSNAME)) {
245 zfs_dbgmsg("txg %lld %s %s (id %llu) %s",
246 fnvlist_lookup_uint64(nvl, ZPOOL_HIST_TXG),
247 fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_NAME),
248 fnvlist_lookup_string(nvl, ZPOOL_HIST_DSNAME),
249 fnvlist_lookup_uint64(nvl, ZPOOL_HIST_DSID),
250 fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_STR));
252 zfs_dbgmsg("txg %lld %s %s",
253 fnvlist_lookup_uint64(nvl, ZPOOL_HIST_TXG),
254 fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_NAME),
255 fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_STR));
257 } else if (nvlist_exists(nvl, ZPOOL_HIST_IOCTL)) {
258 zfs_dbgmsg("ioctl %s",
259 fnvlist_lookup_string(nvl, ZPOOL_HIST_IOCTL));
262 VERIFY3U(nvlist_pack(nvl, &record_packed, &reclen, NV_ENCODE_NATIVE,
265 mutex_enter(&spa->spa_history_lock);
267 /* write out the packed length as little endian */
268 le_len = LE_64((uint64_t)reclen);
269 ret = spa_history_write(spa, &le_len, sizeof (le_len), shpp, tx);
271 ret = spa_history_write(spa, record_packed, reclen, shpp, tx);
273 /* The first command is the create, which we keep forever */
274 if (ret == 0 && shpp->sh_pool_create_len == 0 &&
275 nvlist_exists(nvl, ZPOOL_HIST_CMD)) {
276 shpp->sh_pool_create_len = shpp->sh_bof = shpp->sh_eof;
279 mutex_exit(&spa->spa_history_lock);
280 fnvlist_pack_free(record_packed, reclen);
281 dmu_buf_rele(dbp, FTAG);
286 * Write out a history event.
289 spa_history_log(spa_t *spa, const char *msg)
292 nvlist_t *nvl = fnvlist_alloc();
294 fnvlist_add_string(nvl, ZPOOL_HIST_CMD, msg);
295 err = spa_history_log_nvl(spa, nvl);
301 spa_history_log_nvl(spa_t *spa, nvlist_t *nvl)
307 if (spa_version(spa) < SPA_VERSION_ZPOOL_HISTORY || !spa_writeable(spa))
308 return (SET_ERROR(EINVAL));
310 tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
311 err = dmu_tx_assign(tx, TXG_WAIT);
317 VERIFY0(nvlist_dup(nvl, &nvarg, KM_SLEEP));
318 if (spa_history_zone() != NULL) {
319 fnvlist_add_string(nvarg, ZPOOL_HIST_ZONE,
322 fnvlist_add_uint64(nvarg, ZPOOL_HIST_WHO, crgetruid(CRED()));
324 /* Kick this off asynchronously; errors are ignored. */
325 dsl_sync_task_nowait(spa_get_dsl(spa), spa_history_log_sync,
326 nvarg, 0, ZFS_SPACE_CHECK_NONE, tx);
329 /* spa_history_log_sync will free nvl */
335 * Read out the command history.
338 spa_history_get(spa_t *spa, uint64_t *offp, uint64_t *len, char *buf)
340 objset_t *mos = spa->spa_meta_objset;
342 uint64_t read_len, phys_read_off, phys_eof;
343 uint64_t leftover = 0;
344 spa_history_phys_t *shpp;
348 * If the command history doesn't exist (older pool),
349 * that's ok, just return ENOENT.
351 if (!spa->spa_history)
352 return (SET_ERROR(ENOENT));
355 * The history is logged asynchronously, so when they request
356 * the first chunk of history, make sure everything has been
357 * synced to disk so that we get it.
359 if (*offp == 0 && spa_writeable(spa))
360 txg_wait_synced(spa_get_dsl(spa), 0);
362 if ((err = dmu_bonus_hold(mos, spa->spa_history, FTAG, &dbp)) != 0)
368 dmu_object_info_t doi;
369 dmu_object_info_from_db(dbp, &doi);
370 ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_SPA_HISTORY_OFFSETS);
374 mutex_enter(&spa->spa_history_lock);
375 phys_eof = spa_history_log_to_phys(shpp->sh_eof, shpp);
377 if (*offp < shpp->sh_pool_create_len) {
378 /* read in just the zpool create history */
379 phys_read_off = *offp;
380 read_len = MIN(*len, shpp->sh_pool_create_len -
384 * Need to reset passed in offset to BOF if the passed in
385 * offset has since been overwritten.
387 *offp = MAX(*offp, shpp->sh_bof);
388 phys_read_off = spa_history_log_to_phys(*offp, shpp);
391 * Read up to the minimum of what the user passed down or
392 * the EOF (physical or logical). If we hit physical EOF,
393 * use 'leftover' to read from the physical BOF.
395 if (phys_read_off <= phys_eof) {
396 read_len = MIN(*len, phys_eof - phys_read_off);
399 shpp->sh_phys_max_off - phys_read_off);
400 if (phys_read_off + *len > shpp->sh_phys_max_off) {
401 leftover = MIN(*len - read_len,
402 phys_eof - shpp->sh_pool_create_len);
407 /* offset for consumer to use next */
408 *offp += read_len + leftover;
410 /* tell the consumer how much you actually read */
411 *len = read_len + leftover;
414 mutex_exit(&spa->spa_history_lock);
415 dmu_buf_rele(dbp, FTAG);
419 err = dmu_read(mos, spa->spa_history, phys_read_off, read_len, buf,
421 if (leftover && err == 0) {
422 err = dmu_read(mos, spa->spa_history, shpp->sh_pool_create_len,
423 leftover, buf + read_len, DMU_READ_PREFETCH);
425 mutex_exit(&spa->spa_history_lock);
427 dmu_buf_rele(dbp, FTAG);
432 * The nvlist will be consumed by this call.
435 log_internal(nvlist_t *nvl, const char *operation, spa_t *spa,
436 dmu_tx_t *tx, const char *fmt, va_list adx)
441 * If this is part of creating a pool, not everything is
442 * initialized yet, so don't bother logging the internal events.
443 * Likewise if the pool is not writeable.
445 if (tx->tx_txg == TXG_INITIAL || !spa_writeable(spa)) {
450 msg = kmem_vasprintf(fmt, adx);
451 fnvlist_add_string(nvl, ZPOOL_HIST_INT_STR, msg);
454 fnvlist_add_string(nvl, ZPOOL_HIST_INT_NAME, operation);
455 fnvlist_add_uint64(nvl, ZPOOL_HIST_TXG, tx->tx_txg);
457 if (dmu_tx_is_syncing(tx)) {
458 spa_history_log_sync(nvl, tx);
460 dsl_sync_task_nowait(spa_get_dsl(spa),
461 spa_history_log_sync, nvl, 0, ZFS_SPACE_CHECK_NONE, tx);
463 /* spa_history_log_sync() will free nvl */
467 spa_history_log_internal(spa_t *spa, const char *operation,
468 dmu_tx_t *tx, const char *fmt, ...)
473 /* create a tx if we didn't get one */
475 htx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
476 if (dmu_tx_assign(htx, TXG_WAIT) != 0) {
483 log_internal(fnvlist_alloc(), operation, spa, htx, fmt, adx);
486 /* if we didn't get a tx from the caller, commit the one we made */
492 spa_history_log_internal_ds(dsl_dataset_t *ds, const char *operation,
493 dmu_tx_t *tx, const char *fmt, ...)
496 char namebuf[MAXNAMELEN];
497 nvlist_t *nvl = fnvlist_alloc();
501 dsl_dataset_name(ds, namebuf);
502 fnvlist_add_string(nvl, ZPOOL_HIST_DSNAME, namebuf);
503 fnvlist_add_uint64(nvl, ZPOOL_HIST_DSID, ds->ds_object);
506 log_internal(nvl, operation, dsl_dataset_get_spa(ds), tx, fmt, adx);
511 spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
512 dmu_tx_t *tx, const char *fmt, ...)
515 char namebuf[MAXNAMELEN];
516 nvlist_t *nvl = fnvlist_alloc();
520 dsl_dir_name(dd, namebuf);
521 fnvlist_add_string(nvl, ZPOOL_HIST_DSNAME, namebuf);
522 fnvlist_add_uint64(nvl, ZPOOL_HIST_DSID,
523 dsl_dir_phys(dd)->dd_head_dataset_obj);
526 log_internal(nvl, operation, dd->dd_pool->dp_spa, tx, fmt, adx);
531 spa_history_log_version(spa_t *spa, const char *operation)
533 utsname_t *u = utsname();
535 spa_history_log_internal(spa, operation, NULL,
536 "pool version %llu; software version %llu/%d; uts %s %s %s %s",
537 (u_longlong_t)spa_version(spa), SPA_VERSION, ZPL_VERSION,
538 u->nodename, u->release, u->version, u->machine);
541 #if defined(_KERNEL) && defined(HAVE_SPL)
542 EXPORT_SYMBOL(spa_history_create_obj);
543 EXPORT_SYMBOL(spa_history_get);
544 EXPORT_SYMBOL(spa_history_log);
545 EXPORT_SYMBOL(spa_history_log_internal);
546 EXPORT_SYMBOL(spa_history_log_version);