1/*
2 * CDDL HEADER START
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
25 * Copyright (c) 2014 Integros [integros.com]
26 * Copyright 2017 Joyent, Inc.
27 */
28
29#include <sys/spa.h>
30#include <sys/spa_impl.h>
31#include <sys/zap.h>
32#include <sys/dsl_synctask.h>
33#include <sys/dmu_tx.h>
34#include <sys/dmu_objset.h>
35#include <sys/dsl_dataset.h>
36#include <sys/dsl_dir.h>
37#include <sys/utsname.h>
38#include <sys/cmn_err.h>
39#include <sys/sunddi.h>
40#include <sys/cred.h>
41#include "zfs_comutil.h"
42#ifdef _KERNEL
43#include <sys/zone.h>
44#endif
45
46/*
47 * Routines to manage the on-disk history log.
48 *
49 * The history log is stored as a dmu object containing
50 * <packed record length, record nvlist> tuples.
51 *
52 * Where "record nvlist" is a nvlist containing uint64_ts and strings, and
53 * "packed record length" is the packed length of the "record nvlist" stored
54 * as a little endian uint64_t.
55 *
56 * The log is implemented as a ring buffer, though the original creation
57 * of the pool ('zpool create') is never overwritten.
58 *
59 * The history log is tracked as object 'spa_t::spa_history'.  The bonus buffer
60 * of 'spa_history' stores the offsets for logging/retrieving history as
61 * 'spa_history_phys_t'.  'sh_pool_create_len' is the ending offset in bytes of
62 * where the 'zpool create' record is stored.  This allows us to never
63 * overwrite the original creation of the pool.  'sh_phys_max_off' is the
64 * physical ending offset in bytes of the log.  This tells you the length of
65 * the buffer. 'sh_eof' is the logical EOF (in bytes).  Whenever a record
66 * is added, 'sh_eof' is incremented by the the size of the record.
67 * 'sh_eof' is never decremented.  'sh_bof' is the logical BOF (in bytes).
68 * This is where the consumer should start reading from after reading in
69 * the 'zpool create' portion of the log.
70 *
71 * 'sh_records_lost' keeps track of how many records have been overwritten
72 * and permanently lost.
73 */
74
75/* convert a logical offset to physical */
76static uint64_t
77spa_history_log_to_phys(uint64_t log_off, spa_history_phys_t *shpp)
78{
79	uint64_t phys_len;
80
81	phys_len = shpp->sh_phys_max_off - shpp->sh_pool_create_len;
82	return ((log_off - shpp->sh_pool_create_len) % phys_len
83	    + shpp->sh_pool_create_len);
84}
85
86void
87spa_history_create_obj(spa_t *spa, dmu_tx_t *tx)
88{
89	dmu_buf_t *dbp;
90	spa_history_phys_t *shpp;
91	objset_t *mos = spa->spa_meta_objset;
92
93	ASSERT(spa->spa_history == 0);
94	spa->spa_history = dmu_object_alloc(mos, DMU_OT_SPA_HISTORY,
95	    SPA_OLD_MAXBLOCKSIZE, DMU_OT_SPA_HISTORY_OFFSETS,
96	    sizeof (spa_history_phys_t), tx);
97
98	VERIFY(zap_add(mos, DMU_POOL_DIRECTORY_OBJECT,
99	    DMU_POOL_HISTORY, sizeof (uint64_t), 1,
100	    &spa->spa_history, tx) == 0);
101
102	VERIFY(0 == dmu_bonus_hold(mos, spa->spa_history, FTAG, &dbp));
103	ASSERT(dbp->db_size >= sizeof (spa_history_phys_t));
104
105	shpp = dbp->db_data;
106	dmu_buf_will_dirty(dbp, tx);
107
108	/*
109	 * Figure out maximum size of history log.  We set it at
110	 * 0.1% of pool size, with a max of 1G and min of 128KB.
111	 */
112	shpp->sh_phys_max_off =
113	    metaslab_class_get_dspace(spa_normal_class(spa)) / 1000;
114	shpp->sh_phys_max_off = MIN(shpp->sh_phys_max_off, 1<<30);
115	shpp->sh_phys_max_off = MAX(shpp->sh_phys_max_off, 128<<10);
116
117	dmu_buf_rele(dbp, FTAG);
118}
119
120/*
121 * Change 'sh_bof' to the beginning of the next record.
122 */
123static int
124spa_history_advance_bof(spa_t *spa, spa_history_phys_t *shpp)
125{
126	objset_t *mos = spa->spa_meta_objset;
127	uint64_t firstread, reclen, phys_bof;
128	char buf[sizeof (reclen)];
129	int err;
130
131	phys_bof = spa_history_log_to_phys(shpp->sh_bof, shpp);
132	firstread = MIN(sizeof (reclen), shpp->sh_phys_max_off - phys_bof);
133
134	if ((err = dmu_read(mos, spa->spa_history, phys_bof, firstread,
135	    buf, DMU_READ_PREFETCH)) != 0)
136		return (err);
137	if (firstread != sizeof (reclen)) {
138		if ((err = dmu_read(mos, spa->spa_history,
139		    shpp->sh_pool_create_len, sizeof (reclen) - firstread,
140		    buf + firstread, DMU_READ_PREFETCH)) != 0)
141			return (err);
142	}
143
144	reclen = LE_64(*((uint64_t *)buf));
145	shpp->sh_bof += reclen + sizeof (reclen);
146	shpp->sh_records_lost++;
147	return (0);
148}
149
150static int
151spa_history_write(spa_t *spa, void *buf, uint64_t len, spa_history_phys_t *shpp,
152    dmu_tx_t *tx)
153{
154	uint64_t firstwrite, phys_eof;
155	objset_t *mos = spa->spa_meta_objset;
156	int err;
157
158	ASSERT(MUTEX_HELD(&spa->spa_history_lock));
159
160	/* see if we need to reset logical BOF */
161	while (shpp->sh_phys_max_off - shpp->sh_pool_create_len -
162	    (shpp->sh_eof - shpp->sh_bof) <= len) {
163		if ((err = spa_history_advance_bof(spa, shpp)) != 0) {
164			return (err);
165		}
166	}
167
168	phys_eof = spa_history_log_to_phys(shpp->sh_eof, shpp);
169	firstwrite = MIN(len, shpp->sh_phys_max_off - phys_eof);
170	shpp->sh_eof += len;
171	dmu_write(mos, spa->spa_history, phys_eof, firstwrite, buf, tx);
172
173	len -= firstwrite;
174	if (len > 0) {
175		/* write out the rest at the beginning of physical file */
176		dmu_write(mos, spa->spa_history, shpp->sh_pool_create_len,
177		    len, (char *)buf + firstwrite, tx);
178	}
179
180	return (0);
181}
182
183static char *
184spa_history_zone(void)
185{
186#ifdef _KERNEL
187	if (INGLOBALZONE(curproc))
188		return (NULL);
189	return (curproc->p_zone->zone_name);
190#else
191	return (NULL);
192#endif
193}
194
195/*
196 * Post a history sysevent.
197 *
198 * The nvlist_t* passed into this function will be transformed into a new
199 * nvlist where:
200 *
201 * 1. Nested nvlists will be flattened to a single level
202 * 2. Keys will have their names normalized (to remove any problematic
203 * characters, such as whitespace)
204 *
205 * The nvlist_t passed into this function will duplicated and should be freed
206 * by caller.
207 *
208 */
209static void
210spa_history_log_notify(spa_t *spa, nvlist_t *nvl)
211{
212	nvlist_t *hist_nvl = fnvlist_alloc();
213	uint64_t uint64;
214	char *string;
215
216	if (nvlist_lookup_string(nvl, ZPOOL_HIST_CMD, &string) == 0)
217		fnvlist_add_string(hist_nvl, ZFS_EV_HIST_CMD, string);
218
219	if (nvlist_lookup_string(nvl, ZPOOL_HIST_INT_NAME, &string) == 0)
220		fnvlist_add_string(hist_nvl, ZFS_EV_HIST_INT_NAME, string);
221
222	if (nvlist_lookup_string(nvl, ZPOOL_HIST_ZONE, &string) == 0)
223		fnvlist_add_string(hist_nvl, ZFS_EV_HIST_ZONE, string);
224
225	if (nvlist_lookup_string(nvl, ZPOOL_HIST_HOST, &string) == 0)
226		fnvlist_add_string(hist_nvl, ZFS_EV_HIST_HOST, string);
227
228	if (nvlist_lookup_string(nvl, ZPOOL_HIST_DSNAME, &string) == 0)
229		fnvlist_add_string(hist_nvl, ZFS_EV_HIST_DSNAME, string);
230
231	if (nvlist_lookup_string(nvl, ZPOOL_HIST_INT_STR, &string) == 0)
232		fnvlist_add_string(hist_nvl, ZFS_EV_HIST_INT_STR, string);
233
234	if (nvlist_lookup_string(nvl, ZPOOL_HIST_IOCTL, &string) == 0)
235		fnvlist_add_string(hist_nvl, ZFS_EV_HIST_IOCTL, string);
236
237	if (nvlist_lookup_string(nvl, ZPOOL_HIST_INT_NAME, &string) == 0)
238		fnvlist_add_string(hist_nvl, ZFS_EV_HIST_INT_NAME, string);
239
240	if (nvlist_lookup_uint64(nvl, ZPOOL_HIST_DSID, &uint64) == 0)
241		fnvlist_add_uint64(hist_nvl, ZFS_EV_HIST_DSID, uint64);
242
243	if (nvlist_lookup_uint64(nvl, ZPOOL_HIST_TXG, &uint64) == 0)
244		fnvlist_add_uint64(hist_nvl, ZFS_EV_HIST_TXG, uint64);
245
246	if (nvlist_lookup_uint64(nvl, ZPOOL_HIST_TIME, &uint64) == 0)
247		fnvlist_add_uint64(hist_nvl, ZFS_EV_HIST_TIME, uint64);
248
249	if (nvlist_lookup_uint64(nvl, ZPOOL_HIST_WHO, &uint64) == 0)
250		fnvlist_add_uint64(hist_nvl, ZFS_EV_HIST_WHO, uint64);
251
252	if (nvlist_lookup_uint64(nvl, ZPOOL_HIST_INT_EVENT, &uint64) == 0)
253		fnvlist_add_uint64(hist_nvl, ZFS_EV_HIST_INT_EVENT, uint64);
254
255	spa_event_notify(spa, NULL, hist_nvl, ESC_ZFS_HISTORY_EVENT);
256
257	nvlist_free(hist_nvl);
258}
259
260/*
261 * Write out a history event.
262 */
263/*ARGSUSED*/
264static void
265spa_history_log_sync(void *arg, dmu_tx_t *tx)
266{
267	nvlist_t	*nvl = arg;
268	spa_t		*spa = dmu_tx_pool(tx)->dp_spa;
269	objset_t	*mos = spa->spa_meta_objset;
270	dmu_buf_t	*dbp;
271	spa_history_phys_t *shpp;
272	size_t		reclen;
273	uint64_t	le_len;
274	char		*record_packed = NULL;
275	int		ret;
276
277	/*
278	 * If we have an older pool that doesn't have a command
279	 * history object, create it now.
280	 */
281	mutex_enter(&spa->spa_history_lock);
282	if (!spa->spa_history)
283		spa_history_create_obj(spa, tx);
284	mutex_exit(&spa->spa_history_lock);
285
286	/*
287	 * Get the offset of where we need to write via the bonus buffer.
288	 * Update the offset when the write completes.
289	 */
290	VERIFY0(dmu_bonus_hold(mos, spa->spa_history, FTAG, &dbp));
291	shpp = dbp->db_data;
292
293	dmu_buf_will_dirty(dbp, tx);
294
295#ifdef ZFS_DEBUG
296	{
297		dmu_object_info_t doi;
298		dmu_object_info_from_db(dbp, &doi);
299		ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_SPA_HISTORY_OFFSETS);
300	}
301#endif
302
303	fnvlist_add_uint64(nvl, ZPOOL_HIST_TIME, gethrestime_sec());
304#ifdef _KERNEL
305	fnvlist_add_string(nvl, ZPOOL_HIST_HOST, utsname.nodename);
306#endif
307	if (nvlist_exists(nvl, ZPOOL_HIST_CMD)) {
308		zfs_dbgmsg("command: %s",
309		    fnvlist_lookup_string(nvl, ZPOOL_HIST_CMD));
310	} else if (nvlist_exists(nvl, ZPOOL_HIST_INT_NAME)) {
311		if (nvlist_exists(nvl, ZPOOL_HIST_DSNAME)) {
312			zfs_dbgmsg("txg %lld %s %s (id %llu) %s",
313			    fnvlist_lookup_uint64(nvl, ZPOOL_HIST_TXG),
314			    fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_NAME),
315			    fnvlist_lookup_string(nvl, ZPOOL_HIST_DSNAME),
316			    fnvlist_lookup_uint64(nvl, ZPOOL_HIST_DSID),
317			    fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_STR));
318		} else {
319			zfs_dbgmsg("txg %lld %s %s",
320			    fnvlist_lookup_uint64(nvl, ZPOOL_HIST_TXG),
321			    fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_NAME),
322			    fnvlist_lookup_string(nvl, ZPOOL_HIST_INT_STR));
323		}
324		/*
325		 * The history sysevent is posted only for internal history
326		 * messages to show what has happened, not how it happened. For
327		 * example, the following command:
328		 *
329		 * # zfs destroy -r tank/foo
330		 *
331		 * will result in one sysevent posted per dataset that is
332		 * destroyed as a result of the command - which could be more
333		 * than one event in total.  By contrast, if the sysevent was
334		 * posted as a result of the ZPOOL_HIST_CMD key being present
335		 * it would result in only one sysevent being posted with the
336		 * full command line arguments, requiring the consumer to know
337		 * how to parse and understand zfs(1M) command invocations.
338		 */
339		spa_history_log_notify(spa, nvl);
340	} else if (nvlist_exists(nvl, ZPOOL_HIST_IOCTL)) {
341		zfs_dbgmsg("ioctl %s",
342		    fnvlist_lookup_string(nvl, ZPOOL_HIST_IOCTL));
343	}
344
345	record_packed = fnvlist_pack(nvl, &reclen);
346
347	mutex_enter(&spa->spa_history_lock);
348
349	/* write out the packed length as little endian */
350	le_len = LE_64((uint64_t)reclen);
351	ret = spa_history_write(spa, &le_len, sizeof (le_len), shpp, tx);
352	if (!ret)
353		ret = spa_history_write(spa, record_packed, reclen, shpp, tx);
354
355	/* The first command is the create, which we keep forever */
356	if (ret == 0 && shpp->sh_pool_create_len == 0 &&
357	    nvlist_exists(nvl, ZPOOL_HIST_CMD)) {
358		shpp->sh_pool_create_len = shpp->sh_bof = shpp->sh_eof;
359	}
360
361	mutex_exit(&spa->spa_history_lock);
362	fnvlist_pack_free(record_packed, reclen);
363	dmu_buf_rele(dbp, FTAG);
364	fnvlist_free(nvl);
365}
366
367/*
368 * Write out a history event.
369 */
370int
371spa_history_log(spa_t *spa, const char *msg)
372{
373	int err;
374	nvlist_t *nvl = fnvlist_alloc();
375
376	fnvlist_add_string(nvl, ZPOOL_HIST_CMD, msg);
377	err = spa_history_log_nvl(spa, nvl);
378	fnvlist_free(nvl);
379	return (err);
380}
381
382int
383spa_history_log_nvl(spa_t *spa, nvlist_t *nvl)
384{
385	int err = 0;
386	dmu_tx_t *tx;
387	nvlist_t *nvarg, *in_nvl = NULL;
388
389	if (spa_version(spa) < SPA_VERSION_ZPOOL_HISTORY || !spa_writeable(spa))
390		return (SET_ERROR(EINVAL));
391
392	err = nvlist_lookup_nvlist(nvl, ZPOOL_HIST_INPUT_NVL, &in_nvl);
393	if (err == 0) {
394		(void) nvlist_remove_all(in_nvl, ZPOOL_HIDDEN_ARGS);
395	}
396
397	tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
398	err = dmu_tx_assign(tx, TXG_WAIT);
399	if (err) {
400		dmu_tx_abort(tx);
401		return (err);
402	}
403
404	nvarg = fnvlist_dup(nvl);
405	if (spa_history_zone() != NULL) {
406		fnvlist_add_string(nvarg, ZPOOL_HIST_ZONE,
407		    spa_history_zone());
408	}
409	fnvlist_add_uint64(nvarg, ZPOOL_HIST_WHO, crgetruid(CRED()));
410
411	/* Kick this off asynchronously; errors are ignored. */
412	dsl_sync_task_nowait(spa_get_dsl(spa), spa_history_log_sync,
413	    nvarg, 0, ZFS_SPACE_CHECK_NONE, tx);
414	dmu_tx_commit(tx);
415
416	/* spa_history_log_sync will free nvl */
417	return (err);
418
419}
420
421/*
422 * Read out the command history.
423 */
424int
425spa_history_get(spa_t *spa, uint64_t *offp, uint64_t *len, char *buf)
426{
427	objset_t *mos = spa->spa_meta_objset;
428	dmu_buf_t *dbp;
429	uint64_t read_len, phys_read_off, phys_eof;
430	uint64_t leftover = 0;
431	spa_history_phys_t *shpp;
432	int err;
433
434	/*
435	 * If the command history doesn't exist (older pool),
436	 * that's ok, just return ENOENT.
437	 */
438	if (!spa->spa_history)
439		return (SET_ERROR(ENOENT));
440
441	/*
442	 * The history is logged asynchronously, so when they request
443	 * the first chunk of history, make sure everything has been
444	 * synced to disk so that we get it.
445	 */
446	if (*offp == 0 && spa_writeable(spa))
447		txg_wait_synced(spa_get_dsl(spa), 0);
448
449	if ((err = dmu_bonus_hold(mos, spa->spa_history, FTAG, &dbp)) != 0)
450		return (err);
451	shpp = dbp->db_data;
452
453#ifdef ZFS_DEBUG
454	{
455		dmu_object_info_t doi;
456		dmu_object_info_from_db(dbp, &doi);
457		ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_SPA_HISTORY_OFFSETS);
458	}
459#endif
460
461	mutex_enter(&spa->spa_history_lock);
462	phys_eof = spa_history_log_to_phys(shpp->sh_eof, shpp);
463
464	if (*offp < shpp->sh_pool_create_len) {
465		/* read in just the zpool create history */
466		phys_read_off = *offp;
467		read_len = MIN(*len, shpp->sh_pool_create_len -
468		    phys_read_off);
469	} else {
470		/*
471		 * Need to reset passed in offset to BOF if the passed in
472		 * offset has since been overwritten.
473		 */
474		*offp = MAX(*offp, shpp->sh_bof);
475		phys_read_off = spa_history_log_to_phys(*offp, shpp);
476
477		/*
478		 * Read up to the minimum of what the user passed down or
479		 * the EOF (physical or logical).  If we hit physical EOF,
480		 * use 'leftover' to read from the physical BOF.
481		 */
482		if (phys_read_off <= phys_eof) {
483			read_len = MIN(*len, phys_eof - phys_read_off);
484		} else {
485			read_len = MIN(*len,
486			    shpp->sh_phys_max_off - phys_read_off);
487			if (phys_read_off + *len > shpp->sh_phys_max_off) {
488				leftover = MIN(*len - read_len,
489				    phys_eof - shpp->sh_pool_create_len);
490			}
491		}
492	}
493
494	/* offset for consumer to use next */
495	*offp += read_len + leftover;
496
497	/* tell the consumer how much you actually read */
498	*len = read_len + leftover;
499
500	if (read_len == 0) {
501		mutex_exit(&spa->spa_history_lock);
502		dmu_buf_rele(dbp, FTAG);
503		return (0);
504	}
505
506	err = dmu_read(mos, spa->spa_history, phys_read_off, read_len, buf,
507	    DMU_READ_PREFETCH);
508	if (leftover && err == 0) {
509		err = dmu_read(mos, spa->spa_history, shpp->sh_pool_create_len,
510		    leftover, buf + read_len, DMU_READ_PREFETCH);
511	}
512	mutex_exit(&spa->spa_history_lock);
513
514	dmu_buf_rele(dbp, FTAG);
515	return (err);
516}
517
518/*
519 * The nvlist will be consumed by this call.
520 */
521static void
522log_internal(nvlist_t *nvl, const char *operation, spa_t *spa,
523    dmu_tx_t *tx, const char *fmt, va_list adx)
524{
525	char *msg;
526
527	/*
528	 * If this is part of creating a pool, not everything is
529	 * initialized yet, so don't bother logging the internal events.
530	 * Likewise if the pool is not writeable.
531	 */
532	if (tx->tx_txg == TXG_INITIAL || !spa_writeable(spa)) {
533		fnvlist_free(nvl);
534		return;
535	}
536
537	msg = kmem_alloc(vsnprintf(NULL, 0, fmt, adx) + 1, KM_SLEEP);
538	(void) vsprintf(msg, fmt, adx);
539	fnvlist_add_string(nvl, ZPOOL_HIST_INT_STR, msg);
540	strfree(msg);
541
542	fnvlist_add_string(nvl, ZPOOL_HIST_INT_NAME, operation);
543	fnvlist_add_uint64(nvl, ZPOOL_HIST_TXG, tx->tx_txg);
544
545	if (dmu_tx_is_syncing(tx)) {
546		spa_history_log_sync(nvl, tx);
547	} else {
548		dsl_sync_task_nowait(spa_get_dsl(spa),
549		    spa_history_log_sync, nvl, 0, ZFS_SPACE_CHECK_NONE, tx);
550	}
551	/* spa_history_log_sync() will free nvl */
552}
553
554void
555spa_history_log_internal(spa_t *spa, const char *operation,
556    dmu_tx_t *tx, const char *fmt, ...)
557{
558	dmu_tx_t *htx = tx;
559	va_list adx;
560
561	/* create a tx if we didn't get one */
562	if (tx == NULL) {
563		htx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
564		if (dmu_tx_assign(htx, TXG_WAIT) != 0) {
565			dmu_tx_abort(htx);
566			return;
567		}
568	}
569
570	va_start(adx, fmt);
571	log_internal(fnvlist_alloc(), operation, spa, htx, fmt, adx);
572	va_end(adx);
573
574	/* if we didn't get a tx from the caller, commit the one we made */
575	if (tx == NULL)
576		dmu_tx_commit(htx);
577}
578
579void
580spa_history_log_internal_ds(dsl_dataset_t *ds, const char *operation,
581    dmu_tx_t *tx, const char *fmt, ...)
582{
583	va_list adx;
584	char namebuf[ZFS_MAX_DATASET_NAME_LEN];
585	nvlist_t *nvl = fnvlist_alloc();
586
587	ASSERT(tx != NULL);
588
589	dsl_dataset_name(ds, namebuf);
590	fnvlist_add_string(nvl, ZPOOL_HIST_DSNAME, namebuf);
591	fnvlist_add_uint64(nvl, ZPOOL_HIST_DSID, ds->ds_object);
592
593	va_start(adx, fmt);
594	log_internal(nvl, operation, dsl_dataset_get_spa(ds), tx, fmt, adx);
595	va_end(adx);
596}
597
598void
599spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
600    dmu_tx_t *tx, const char *fmt, ...)
601{
602	va_list adx;
603	char namebuf[ZFS_MAX_DATASET_NAME_LEN];
604	nvlist_t *nvl = fnvlist_alloc();
605
606	ASSERT(tx != NULL);
607
608	dsl_dir_name(dd, namebuf);
609	fnvlist_add_string(nvl, ZPOOL_HIST_DSNAME, namebuf);
610	fnvlist_add_uint64(nvl, ZPOOL_HIST_DSID,
611	    dsl_dir_phys(dd)->dd_head_dataset_obj);
612
613	va_start(adx, fmt);
614	log_internal(nvl, operation, dd->dd_pool->dp_spa, tx, fmt, adx);
615	va_end(adx);
616}
617
618void
619spa_history_log_version(spa_t *spa, const char *operation)
620{
621	spa_history_log_internal(spa, operation, NULL,
622	    "pool version %llu; software version %llu/%llu; uts %s %s %s %s",
623	    (u_longlong_t)spa_version(spa), SPA_VERSION, ZPL_VERSION,
624	    utsname.nodename, utsname.release, utsname.version,
625	    utsname.machine);
626}
627