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 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
27 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
28 * Copyright (c) 2015, STRATO AG, Inc. All rights reserved.
29 */
30
31 /* Portions Copyright 2010 Robert Milkowski */
32
33 #include <sys/cred.h>
34 #include <sys/zfs_context.h>
35 #include <sys/dmu_objset.h>
36 #include <sys/dsl_dir.h>
37 #include <sys/dsl_dataset.h>
38 #include <sys/dsl_prop.h>
39 #include <sys/dsl_pool.h>
40 #include <sys/dsl_synctask.h>
41 #include <sys/dsl_deleg.h>
42 #include <sys/dnode.h>
43 #include <sys/dbuf.h>
44 #include <sys/zvol.h>
45 #include <sys/dmu_tx.h>
46 #include <sys/zap.h>
47 #include <sys/zil.h>
48 #include <sys/dmu_impl.h>
49 #include <sys/zfs_ioctl.h>
50 #include <sys/sa.h>
51 #include <sys/zfs_onexit.h>
52 #include <sys/dsl_destroy.h>
53 #include <sys/vdev.h>
54
55 /*
56 * Needed to close a window in dnode_move() that allows the objset to be freed
57 * before it can be safely accessed.
58 */
59 krwlock_t os_lock;
60
61 /*
62 * Tunable to overwrite the maximum number of threads for the parallization
63 * of dmu_objset_find_dp, needed to speed up the import of pools with many
64 * datasets.
65 * Default is 4 times the number of leaf vdevs.
66 */
67 int dmu_find_threads = 0;
68
69 static void dmu_objset_find_dp_cb(void *arg);
70
71 void
dmu_objset_init(void)72 dmu_objset_init(void)
73 {
74 rw_init(&os_lock, NULL, RW_DEFAULT, NULL);
75 }
76
77 void
dmu_objset_fini(void)78 dmu_objset_fini(void)
79 {
80 rw_destroy(&os_lock);
81 }
82
83 spa_t *
dmu_objset_spa(objset_t * os)84 dmu_objset_spa(objset_t *os)
85 {
86 return (os->os_spa);
87 }
88
89 zilog_t *
dmu_objset_zil(objset_t * os)90 dmu_objset_zil(objset_t *os)
91 {
92 return (os->os_zil);
93 }
94
95 dsl_pool_t *
dmu_objset_pool(objset_t * os)96 dmu_objset_pool(objset_t *os)
97 {
98 dsl_dataset_t *ds;
99
100 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir)
101 return (ds->ds_dir->dd_pool);
102 else
103 return (spa_get_dsl(os->os_spa));
104 }
105
106 dsl_dataset_t *
dmu_objset_ds(objset_t * os)107 dmu_objset_ds(objset_t *os)
108 {
109 return (os->os_dsl_dataset);
110 }
111
112 dmu_objset_type_t
dmu_objset_type(objset_t * os)113 dmu_objset_type(objset_t *os)
114 {
115 return (os->os_phys->os_type);
116 }
117
118 void
dmu_objset_name(objset_t * os,char * buf)119 dmu_objset_name(objset_t *os, char *buf)
120 {
121 dsl_dataset_name(os->os_dsl_dataset, buf);
122 }
123
124 uint64_t
dmu_objset_id(objset_t * os)125 dmu_objset_id(objset_t *os)
126 {
127 dsl_dataset_t *ds = os->os_dsl_dataset;
128
129 return (ds ? ds->ds_object : 0);
130 }
131
132 zfs_sync_type_t
dmu_objset_syncprop(objset_t * os)133 dmu_objset_syncprop(objset_t *os)
134 {
135 return (os->os_sync);
136 }
137
138 zfs_logbias_op_t
dmu_objset_logbias(objset_t * os)139 dmu_objset_logbias(objset_t *os)
140 {
141 return (os->os_logbias);
142 }
143
144 static void
checksum_changed_cb(void * arg,uint64_t newval)145 checksum_changed_cb(void *arg, uint64_t newval)
146 {
147 objset_t *os = arg;
148
149 /*
150 * Inheritance should have been done by now.
151 */
152 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
153
154 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE);
155 }
156
157 static void
compression_changed_cb(void * arg,uint64_t newval)158 compression_changed_cb(void *arg, uint64_t newval)
159 {
160 objset_t *os = arg;
161
162 /*
163 * Inheritance and range checking should have been done by now.
164 */
165 ASSERT(newval != ZIO_COMPRESS_INHERIT);
166
167 os->os_compress = zio_compress_select(os->os_spa, newval,
168 ZIO_COMPRESS_ON);
169 }
170
171 static void
copies_changed_cb(void * arg,uint64_t newval)172 copies_changed_cb(void *arg, uint64_t newval)
173 {
174 objset_t *os = arg;
175
176 /*
177 * Inheritance and range checking should have been done by now.
178 */
179 ASSERT(newval > 0);
180 ASSERT(newval <= spa_max_replication(os->os_spa));
181
182 os->os_copies = newval;
183 }
184
185 static void
dedup_changed_cb(void * arg,uint64_t newval)186 dedup_changed_cb(void *arg, uint64_t newval)
187 {
188 objset_t *os = arg;
189 spa_t *spa = os->os_spa;
190 enum zio_checksum checksum;
191
192 /*
193 * Inheritance should have been done by now.
194 */
195 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
196
197 checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF);
198
199 os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK;
200 os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY);
201 }
202
203 static void
primary_cache_changed_cb(void * arg,uint64_t newval)204 primary_cache_changed_cb(void *arg, uint64_t newval)
205 {
206 objset_t *os = arg;
207
208 /*
209 * Inheritance and range checking should have been done by now.
210 */
211 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
212 newval == ZFS_CACHE_METADATA);
213
214 os->os_primary_cache = newval;
215 }
216
217 static void
secondary_cache_changed_cb(void * arg,uint64_t newval)218 secondary_cache_changed_cb(void *arg, uint64_t newval)
219 {
220 objset_t *os = arg;
221
222 /*
223 * Inheritance and range checking should have been done by now.
224 */
225 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
226 newval == ZFS_CACHE_METADATA);
227
228 os->os_secondary_cache = newval;
229 }
230
231 static void
sync_changed_cb(void * arg,uint64_t newval)232 sync_changed_cb(void *arg, uint64_t newval)
233 {
234 objset_t *os = arg;
235
236 /*
237 * Inheritance and range checking should have been done by now.
238 */
239 ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS ||
240 newval == ZFS_SYNC_DISABLED);
241
242 os->os_sync = newval;
243 if (os->os_zil)
244 zil_set_sync(os->os_zil, newval);
245 }
246
247 static void
redundant_metadata_changed_cb(void * arg,uint64_t newval)248 redundant_metadata_changed_cb(void *arg, uint64_t newval)
249 {
250 objset_t *os = arg;
251
252 /*
253 * Inheritance and range checking should have been done by now.
254 */
255 ASSERT(newval == ZFS_REDUNDANT_METADATA_ALL ||
256 newval == ZFS_REDUNDANT_METADATA_MOST);
257
258 os->os_redundant_metadata = newval;
259 }
260
261 static void
logbias_changed_cb(void * arg,uint64_t newval)262 logbias_changed_cb(void *arg, uint64_t newval)
263 {
264 objset_t *os = arg;
265
266 ASSERT(newval == ZFS_LOGBIAS_LATENCY ||
267 newval == ZFS_LOGBIAS_THROUGHPUT);
268 os->os_logbias = newval;
269 if (os->os_zil)
270 zil_set_logbias(os->os_zil, newval);
271 }
272
273 static void
recordsize_changed_cb(void * arg,uint64_t newval)274 recordsize_changed_cb(void *arg, uint64_t newval)
275 {
276 objset_t *os = arg;
277
278 os->os_recordsize = newval;
279 }
280
281 void
dmu_objset_byteswap(void * buf,size_t size)282 dmu_objset_byteswap(void *buf, size_t size)
283 {
284 objset_phys_t *osp = buf;
285
286 ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t));
287 dnode_byteswap(&osp->os_meta_dnode);
288 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t));
289 osp->os_type = BSWAP_64(osp->os_type);
290 osp->os_flags = BSWAP_64(osp->os_flags);
291 if (size == sizeof (objset_phys_t)) {
292 dnode_byteswap(&osp->os_userused_dnode);
293 dnode_byteswap(&osp->os_groupused_dnode);
294 }
295 }
296
297 int
dmu_objset_open_impl(spa_t * spa,dsl_dataset_t * ds,blkptr_t * bp,objset_t ** osp)298 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
299 objset_t **osp)
300 {
301 objset_t *os;
302 int i, err;
303
304 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock));
305
306 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP);
307 os->os_dsl_dataset = ds;
308 os->os_spa = spa;
309 os->os_rootbp = bp;
310 if (!BP_IS_HOLE(os->os_rootbp)) {
311 arc_flags_t aflags = ARC_FLAG_WAIT;
312 zbookmark_phys_t zb;
313 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
314 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
315
316 if (DMU_OS_IS_L2CACHEABLE(os))
317 aflags |= ARC_FLAG_L2CACHE;
318 if (DMU_OS_IS_L2COMPRESSIBLE(os))
319 aflags |= ARC_FLAG_L2COMPRESS;
320
321 dprintf_bp(os->os_rootbp, "reading %s", "");
322 err = arc_read(NULL, spa, os->os_rootbp,
323 arc_getbuf_func, &os->os_phys_buf,
324 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb);
325 if (err != 0) {
326 kmem_free(os, sizeof (objset_t));
327 /* convert checksum errors into IO errors */
328 if (err == ECKSUM)
329 err = SET_ERROR(EIO);
330 return (err);
331 }
332
333 /* Increase the blocksize if we are permitted. */
334 if (spa_version(spa) >= SPA_VERSION_USERSPACE &&
335 arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) {
336 arc_buf_t *buf = arc_buf_alloc(spa,
337 sizeof (objset_phys_t), &os->os_phys_buf,
338 ARC_BUFC_METADATA);
339 bzero(buf->b_data, sizeof (objset_phys_t));
340 bcopy(os->os_phys_buf->b_data, buf->b_data,
341 arc_buf_size(os->os_phys_buf));
342 (void) arc_buf_remove_ref(os->os_phys_buf,
343 &os->os_phys_buf);
344 os->os_phys_buf = buf;
345 }
346
347 os->os_phys = os->os_phys_buf->b_data;
348 os->os_flags = os->os_phys->os_flags;
349 } else {
350 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ?
351 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE;
352 os->os_phys_buf = arc_buf_alloc(spa, size,
353 &os->os_phys_buf, ARC_BUFC_METADATA);
354 os->os_phys = os->os_phys_buf->b_data;
355 bzero(os->os_phys, size);
356 }
357
358 /*
359 * Note: the changed_cb will be called once before the register
360 * func returns, thus changing the checksum/compression from the
361 * default (fletcher2/off). Snapshots don't need to know about
362 * checksum/compression/copies.
363 */
364 if (ds != NULL) {
365 boolean_t needlock = B_FALSE;
366
367 /*
368 * Note: it's valid to open the objset if the dataset is
369 * long-held, in which case the pool_config lock will not
370 * be held.
371 */
372 if (!dsl_pool_config_held(dmu_objset_pool(os))) {
373 needlock = B_TRUE;
374 dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
375 }
376 err = dsl_prop_register(ds,
377 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
378 primary_cache_changed_cb, os);
379 if (err == 0) {
380 err = dsl_prop_register(ds,
381 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
382 secondary_cache_changed_cb, os);
383 }
384 if (!ds->ds_is_snapshot) {
385 if (err == 0) {
386 err = dsl_prop_register(ds,
387 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
388 checksum_changed_cb, os);
389 }
390 if (err == 0) {
391 err = dsl_prop_register(ds,
392 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
393 compression_changed_cb, os);
394 }
395 if (err == 0) {
396 err = dsl_prop_register(ds,
397 zfs_prop_to_name(ZFS_PROP_COPIES),
398 copies_changed_cb, os);
399 }
400 if (err == 0) {
401 err = dsl_prop_register(ds,
402 zfs_prop_to_name(ZFS_PROP_DEDUP),
403 dedup_changed_cb, os);
404 }
405 if (err == 0) {
406 err = dsl_prop_register(ds,
407 zfs_prop_to_name(ZFS_PROP_LOGBIAS),
408 logbias_changed_cb, os);
409 }
410 if (err == 0) {
411 err = dsl_prop_register(ds,
412 zfs_prop_to_name(ZFS_PROP_SYNC),
413 sync_changed_cb, os);
414 }
415 if (err == 0) {
416 err = dsl_prop_register(ds,
417 zfs_prop_to_name(
418 ZFS_PROP_REDUNDANT_METADATA),
419 redundant_metadata_changed_cb, os);
420 }
421 if (err == 0) {
422 err = dsl_prop_register(ds,
423 zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
424 recordsize_changed_cb, os);
425 }
426 }
427 if (needlock)
428 dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
429 if (err != 0) {
430 VERIFY(arc_buf_remove_ref(os->os_phys_buf,
431 &os->os_phys_buf));
432 kmem_free(os, sizeof (objset_t));
433 return (err);
434 }
435 } else {
436 /* It's the meta-objset. */
437 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
438 os->os_compress = ZIO_COMPRESS_ON;
439 os->os_copies = spa_max_replication(spa);
440 os->os_dedup_checksum = ZIO_CHECKSUM_OFF;
441 os->os_dedup_verify = B_FALSE;
442 os->os_logbias = ZFS_LOGBIAS_LATENCY;
443 os->os_sync = ZFS_SYNC_STANDARD;
444 os->os_primary_cache = ZFS_CACHE_ALL;
445 os->os_secondary_cache = ZFS_CACHE_ALL;
446 }
447
448 if (ds == NULL || !ds->ds_is_snapshot)
449 os->os_zil_header = os->os_phys->os_zil_header;
450 os->os_zil = zil_alloc(os, &os->os_zil_header);
451
452 for (i = 0; i < TXG_SIZE; i++) {
453 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t),
454 offsetof(dnode_t, dn_dirty_link[i]));
455 list_create(&os->os_free_dnodes[i], sizeof (dnode_t),
456 offsetof(dnode_t, dn_dirty_link[i]));
457 }
458 list_create(&os->os_dnodes, sizeof (dnode_t),
459 offsetof(dnode_t, dn_link));
460 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
461 offsetof(dmu_buf_impl_t, db_link));
462
463 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL);
464 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
465 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);
466
467 dnode_special_open(os, &os->os_phys->os_meta_dnode,
468 DMU_META_DNODE_OBJECT, &os->os_meta_dnode);
469 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
470 dnode_special_open(os, &os->os_phys->os_userused_dnode,
471 DMU_USERUSED_OBJECT, &os->os_userused_dnode);
472 dnode_special_open(os, &os->os_phys->os_groupused_dnode,
473 DMU_GROUPUSED_OBJECT, &os->os_groupused_dnode);
474 }
475
476 *osp = os;
477 return (0);
478 }
479
480 int
dmu_objset_from_ds(dsl_dataset_t * ds,objset_t ** osp)481 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
482 {
483 int err = 0;
484
485 /*
486 * We shouldn't be doing anything with dsl_dataset_t's unless the
487 * pool_config lock is held, or the dataset is long-held.
488 */
489 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool) ||
490 dsl_dataset_long_held(ds));
491
492 mutex_enter(&ds->ds_opening_lock);
493 if (ds->ds_objset == NULL) {
494 objset_t *os;
495 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
496 ds, dsl_dataset_get_blkptr(ds), &os);
497
498 if (err == 0) {
499 mutex_enter(&ds->ds_lock);
500 ASSERT(ds->ds_objset == NULL);
501 ds->ds_objset = os;
502 mutex_exit(&ds->ds_lock);
503 }
504 }
505 *osp = ds->ds_objset;
506 mutex_exit(&ds->ds_opening_lock);
507 return (err);
508 }
509
510 /*
511 * Holds the pool while the objset is held. Therefore only one objset
512 * can be held at a time.
513 */
514 int
dmu_objset_hold(const char * name,void * tag,objset_t ** osp)515 dmu_objset_hold(const char *name, void *tag, objset_t **osp)
516 {
517 dsl_pool_t *dp;
518 dsl_dataset_t *ds;
519 int err;
520
521 err = dsl_pool_hold(name, tag, &dp);
522 if (err != 0)
523 return (err);
524 err = dsl_dataset_hold(dp, name, tag, &ds);
525 if (err != 0) {
526 dsl_pool_rele(dp, tag);
527 return (err);
528 }
529
530 err = dmu_objset_from_ds(ds, osp);
531 if (err != 0) {
532 dsl_dataset_rele(ds, tag);
533 dsl_pool_rele(dp, tag);
534 }
535
536 return (err);
537 }
538
539 static int
dmu_objset_own_impl(dsl_dataset_t * ds,dmu_objset_type_t type,boolean_t readonly,void * tag,objset_t ** osp)540 dmu_objset_own_impl(dsl_dataset_t *ds, dmu_objset_type_t type,
541 boolean_t readonly, void *tag, objset_t **osp)
542 {
543 int err;
544
545 err = dmu_objset_from_ds(ds, osp);
546 if (err != 0) {
547 dsl_dataset_disown(ds, tag);
548 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) {
549 dsl_dataset_disown(ds, tag);
550 return (SET_ERROR(EINVAL));
551 } else if (!readonly && dsl_dataset_is_snapshot(ds)) {
552 dsl_dataset_disown(ds, tag);
553 return (SET_ERROR(EROFS));
554 }
555 return (err);
556 }
557
558 /*
559 * dsl_pool must not be held when this is called.
560 * Upon successful return, there will be a longhold on the dataset,
561 * and the dsl_pool will not be held.
562 */
563 int
dmu_objset_own(const char * name,dmu_objset_type_t type,boolean_t readonly,void * tag,objset_t ** osp)564 dmu_objset_own(const char *name, dmu_objset_type_t type,
565 boolean_t readonly, void *tag, objset_t **osp)
566 {
567 dsl_pool_t *dp;
568 dsl_dataset_t *ds;
569 int err;
570
571 err = dsl_pool_hold(name, FTAG, &dp);
572 if (err != 0)
573 return (err);
574 err = dsl_dataset_own(dp, name, tag, &ds);
575 if (err != 0) {
576 dsl_pool_rele(dp, FTAG);
577 return (err);
578 }
579 err = dmu_objset_own_impl(ds, type, readonly, tag, osp);
580 dsl_pool_rele(dp, FTAG);
581
582 return (err);
583 }
584
585 int
dmu_objset_own_obj(dsl_pool_t * dp,uint64_t obj,dmu_objset_type_t type,boolean_t readonly,void * tag,objset_t ** osp)586 dmu_objset_own_obj(dsl_pool_t *dp, uint64_t obj, dmu_objset_type_t type,
587 boolean_t readonly, void *tag, objset_t **osp)
588 {
589 dsl_dataset_t *ds;
590 int err;
591
592 err = dsl_dataset_own_obj(dp, obj, tag, &ds);
593 if (err != 0)
594 return (err);
595
596 return (dmu_objset_own_impl(ds, type, readonly, tag, osp));
597 }
598
599 void
dmu_objset_rele(objset_t * os,void * tag)600 dmu_objset_rele(objset_t *os, void *tag)
601 {
602 dsl_pool_t *dp = dmu_objset_pool(os);
603 dsl_dataset_rele(os->os_dsl_dataset, tag);
604 dsl_pool_rele(dp, tag);
605 }
606
607 /*
608 * When we are called, os MUST refer to an objset associated with a dataset
609 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner
610 * == tag. We will then release and reacquire ownership of the dataset while
611 * holding the pool config_rwlock to avoid intervening namespace or ownership
612 * changes may occur.
613 *
614 * This exists solely to accommodate zfs_ioc_userspace_upgrade()'s desire to
615 * release the hold on its dataset and acquire a new one on the dataset of the
616 * same name so that it can be partially torn down and reconstructed.
617 */
618 void
dmu_objset_refresh_ownership(objset_t * os,void * tag)619 dmu_objset_refresh_ownership(objset_t *os, void *tag)
620 {
621 dsl_pool_t *dp;
622 dsl_dataset_t *ds, *newds;
623 char name[ZFS_MAX_DATASET_NAME_LEN];
624
625 ds = os->os_dsl_dataset;
626 VERIFY3P(ds, !=, NULL);
627 VERIFY3P(ds->ds_owner, ==, tag);
628 VERIFY(dsl_dataset_long_held(ds));
629
630 dsl_dataset_name(ds, name);
631 dp = dmu_objset_pool(os);
632 dsl_pool_config_enter(dp, FTAG);
633 dmu_objset_disown(os, tag);
634 VERIFY0(dsl_dataset_own(dp, name, tag, &newds));
635 VERIFY3P(newds, ==, os->os_dsl_dataset);
636 dsl_pool_config_exit(dp, FTAG);
637 }
638
639 void
dmu_objset_disown(objset_t * os,void * tag)640 dmu_objset_disown(objset_t *os, void *tag)
641 {
642 dsl_dataset_disown(os->os_dsl_dataset, tag);
643 }
644
645 void
dmu_objset_evict_dbufs(objset_t * os)646 dmu_objset_evict_dbufs(objset_t *os)
647 {
648 dnode_t dn_marker;
649 dnode_t *dn;
650
651 mutex_enter(&os->os_lock);
652 dn = list_head(&os->os_dnodes);
653 while (dn != NULL) {
654 /*
655 * Skip dnodes without holds. We have to do this dance
656 * because dnode_add_ref() only works if there is already a
657 * hold. If the dnode has no holds, then it has no dbufs.
658 */
659 if (dnode_add_ref(dn, FTAG)) {
660 list_insert_after(&os->os_dnodes, dn, &dn_marker);
661 mutex_exit(&os->os_lock);
662
663 dnode_evict_dbufs(dn);
664 dnode_rele(dn, FTAG);
665
666 mutex_enter(&os->os_lock);
667 dn = list_next(&os->os_dnodes, &dn_marker);
668 list_remove(&os->os_dnodes, &dn_marker);
669 } else {
670 dn = list_next(&os->os_dnodes, dn);
671 }
672 }
673 mutex_exit(&os->os_lock);
674
675 if (DMU_USERUSED_DNODE(os) != NULL) {
676 dnode_evict_dbufs(DMU_GROUPUSED_DNODE(os));
677 dnode_evict_dbufs(DMU_USERUSED_DNODE(os));
678 }
679 dnode_evict_dbufs(DMU_META_DNODE(os));
680 }
681
682 /*
683 * Objset eviction processing is split into into two pieces.
684 * The first marks the objset as evicting, evicts any dbufs that
685 * have a refcount of zero, and then queues up the objset for the
686 * second phase of eviction. Once os->os_dnodes has been cleared by
687 * dnode_buf_pageout()->dnode_destroy(), the second phase is executed.
688 * The second phase closes the special dnodes, dequeues the objset from
689 * the list of those undergoing eviction, and finally frees the objset.
690 *
691 * NOTE: Due to asynchronous eviction processing (invocation of
692 * dnode_buf_pageout()), it is possible for the meta dnode for the
693 * objset to have no holds even though os->os_dnodes is not empty.
694 */
695 void
dmu_objset_evict(objset_t * os)696 dmu_objset_evict(objset_t *os)
697 {
698 dsl_dataset_t *ds = os->os_dsl_dataset;
699
700 for (int t = 0; t < TXG_SIZE; t++)
701 ASSERT(!dmu_objset_is_dirty(os, t));
702
703 if (ds) {
704 if (!ds->ds_is_snapshot) {
705 VERIFY0(dsl_prop_unregister(ds,
706 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
707 checksum_changed_cb, os));
708 VERIFY0(dsl_prop_unregister(ds,
709 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
710 compression_changed_cb, os));
711 VERIFY0(dsl_prop_unregister(ds,
712 zfs_prop_to_name(ZFS_PROP_COPIES),
713 copies_changed_cb, os));
714 VERIFY0(dsl_prop_unregister(ds,
715 zfs_prop_to_name(ZFS_PROP_DEDUP),
716 dedup_changed_cb, os));
717 VERIFY0(dsl_prop_unregister(ds,
718 zfs_prop_to_name(ZFS_PROP_LOGBIAS),
719 logbias_changed_cb, os));
720 VERIFY0(dsl_prop_unregister(ds,
721 zfs_prop_to_name(ZFS_PROP_SYNC),
722 sync_changed_cb, os));
723 VERIFY0(dsl_prop_unregister(ds,
724 zfs_prop_to_name(ZFS_PROP_REDUNDANT_METADATA),
725 redundant_metadata_changed_cb, os));
726 VERIFY0(dsl_prop_unregister(ds,
727 zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
728 recordsize_changed_cb, os));
729 }
730 VERIFY0(dsl_prop_unregister(ds,
731 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
732 primary_cache_changed_cb, os));
733 VERIFY0(dsl_prop_unregister(ds,
734 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
735 secondary_cache_changed_cb, os));
736 }
737
738 if (os->os_sa)
739 sa_tear_down(os);
740
741 dmu_objset_evict_dbufs(os);
742
743 mutex_enter(&os->os_lock);
744 spa_evicting_os_register(os->os_spa, os);
745 if (list_is_empty(&os->os_dnodes)) {
746 mutex_exit(&os->os_lock);
747 dmu_objset_evict_done(os);
748 } else {
749 mutex_exit(&os->os_lock);
750 }
751 }
752
753 void
dmu_objset_evict_done(objset_t * os)754 dmu_objset_evict_done(objset_t *os)
755 {
756 ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
757
758 dnode_special_close(&os->os_meta_dnode);
759 if (DMU_USERUSED_DNODE(os)) {
760 dnode_special_close(&os->os_userused_dnode);
761 dnode_special_close(&os->os_groupused_dnode);
762 }
763 zil_free(os->os_zil);
764
765 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf));
766
767 /*
768 * This is a barrier to prevent the objset from going away in
769 * dnode_move() until we can safely ensure that the objset is still in
770 * use. We consider the objset valid before the barrier and invalid
771 * after the barrier.
772 */
773 rw_enter(&os_lock, RW_READER);
774 rw_exit(&os_lock);
775
776 mutex_destroy(&os->os_lock);
777 mutex_destroy(&os->os_obj_lock);
778 mutex_destroy(&os->os_user_ptr_lock);
779 spa_evicting_os_deregister(os->os_spa, os);
780 kmem_free(os, sizeof (objset_t));
781 }
782
783 timestruc_t
dmu_objset_snap_cmtime(objset_t * os)784 dmu_objset_snap_cmtime(objset_t *os)
785 {
786 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
787 }
788
789 /* called from dsl for meta-objset */
790 objset_t *
dmu_objset_create_impl(spa_t * spa,dsl_dataset_t * ds,blkptr_t * bp,dmu_objset_type_t type,dmu_tx_t * tx)791 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
792 dmu_objset_type_t type, dmu_tx_t *tx)
793 {
794 objset_t *os;
795 dnode_t *mdn;
796
797 ASSERT(dmu_tx_is_syncing(tx));
798
799 if (ds != NULL)
800 VERIFY0(dmu_objset_from_ds(ds, &os));
801 else
802 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os));
803
804 mdn = DMU_META_DNODE(os);
805
806 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT,
807 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx);
808
809 /*
810 * We don't want to have to increase the meta-dnode's nlevels
811 * later, because then we could do it in quescing context while
812 * we are also accessing it in open context.
813 *
814 * This precaution is not necessary for the MOS (ds == NULL),
815 * because the MOS is only updated in syncing context.
816 * This is most fortunate: the MOS is the only objset that
817 * needs to be synced multiple times as spa_sync() iterates
818 * to convergence, so minimizing its dn_nlevels matters.
819 */
820 if (ds != NULL) {
821 int levels = 1;
822
823 /*
824 * Determine the number of levels necessary for the meta-dnode
825 * to contain DN_MAX_OBJECT dnodes.
826 */
827 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift +
828 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) <
829 DN_MAX_OBJECT * sizeof (dnode_phys_t))
830 levels++;
831
832 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] =
833 mdn->dn_nlevels = levels;
834 }
835
836 ASSERT(type != DMU_OST_NONE);
837 ASSERT(type != DMU_OST_ANY);
838 ASSERT(type < DMU_OST_NUMTYPES);
839 os->os_phys->os_type = type;
840 if (dmu_objset_userused_enabled(os)) {
841 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
842 os->os_flags = os->os_phys->os_flags;
843 }
844
845 dsl_dataset_dirty(ds, tx);
846
847 return (os);
848 }
849
850 typedef struct dmu_objset_create_arg {
851 const char *doca_name;
852 cred_t *doca_cred;
853 void (*doca_userfunc)(objset_t *os, void *arg,
854 cred_t *cr, dmu_tx_t *tx);
855 void *doca_userarg;
856 dmu_objset_type_t doca_type;
857 uint64_t doca_flags;
858 } dmu_objset_create_arg_t;
859
860 /*ARGSUSED*/
861 static int
dmu_objset_create_check(void * arg,dmu_tx_t * tx)862 dmu_objset_create_check(void *arg, dmu_tx_t *tx)
863 {
864 dmu_objset_create_arg_t *doca = arg;
865 dsl_pool_t *dp = dmu_tx_pool(tx);
866 dsl_dir_t *pdd;
867 const char *tail;
868 int error;
869
870 if (strchr(doca->doca_name, '@') != NULL)
871 return (SET_ERROR(EINVAL));
872
873 if (strlen(doca->doca_name) >= ZFS_MAX_DATASET_NAME_LEN)
874 return (SET_ERROR(ENAMETOOLONG));
875
876 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail);
877 if (error != 0)
878 return (error);
879 if (tail == NULL) {
880 dsl_dir_rele(pdd, FTAG);
881 return (SET_ERROR(EEXIST));
882 }
883 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL,
884 doca->doca_cred);
885 dsl_dir_rele(pdd, FTAG);
886
887 return (error);
888 }
889
890 static void
dmu_objset_create_sync(void * arg,dmu_tx_t * tx)891 dmu_objset_create_sync(void *arg, dmu_tx_t *tx)
892 {
893 dmu_objset_create_arg_t *doca = arg;
894 dsl_pool_t *dp = dmu_tx_pool(tx);
895 dsl_dir_t *pdd;
896 const char *tail;
897 dsl_dataset_t *ds;
898 uint64_t obj;
899 blkptr_t *bp;
900 objset_t *os;
901
902 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail));
903
904 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags,
905 doca->doca_cred, tx);
906
907 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds));
908 bp = dsl_dataset_get_blkptr(ds);
909 os = dmu_objset_create_impl(pdd->dd_pool->dp_spa,
910 ds, bp, doca->doca_type, tx);
911
912 if (doca->doca_userfunc != NULL) {
913 doca->doca_userfunc(os, doca->doca_userarg,
914 doca->doca_cred, tx);
915 }
916
917 spa_history_log_internal_ds(ds, "create", tx, "");
918 dsl_dataset_rele(ds, FTAG);
919 dsl_dir_rele(pdd, FTAG);
920 }
921
922 int
dmu_objset_create(const char * name,dmu_objset_type_t type,uint64_t flags,void (* func)(objset_t * os,void * arg,cred_t * cr,dmu_tx_t * tx),void * arg)923 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
924 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg)
925 {
926 dmu_objset_create_arg_t doca;
927
928 doca.doca_name = name;
929 doca.doca_cred = CRED();
930 doca.doca_flags = flags;
931 doca.doca_userfunc = func;
932 doca.doca_userarg = arg;
933 doca.doca_type = type;
934
935 return (dsl_sync_task(name,
936 dmu_objset_create_check, dmu_objset_create_sync, &doca,
937 5, ZFS_SPACE_CHECK_NORMAL));
938 }
939
940 typedef struct dmu_objset_clone_arg {
941 const char *doca_clone;
942 const char *doca_origin;
943 cred_t *doca_cred;
944 } dmu_objset_clone_arg_t;
945
946 /*ARGSUSED*/
947 static int
dmu_objset_clone_check(void * arg,dmu_tx_t * tx)948 dmu_objset_clone_check(void *arg, dmu_tx_t *tx)
949 {
950 dmu_objset_clone_arg_t *doca = arg;
951 dsl_dir_t *pdd;
952 const char *tail;
953 int error;
954 dsl_dataset_t *origin;
955 dsl_pool_t *dp = dmu_tx_pool(tx);
956
957 if (strchr(doca->doca_clone, '@') != NULL)
958 return (SET_ERROR(EINVAL));
959
960 if (strlen(doca->doca_clone) >= ZFS_MAX_DATASET_NAME_LEN)
961 return (SET_ERROR(ENAMETOOLONG));
962
963 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail);
964 if (error != 0)
965 return (error);
966 if (tail == NULL) {
967 dsl_dir_rele(pdd, FTAG);
968 return (SET_ERROR(EEXIST));
969 }
970
971 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL,
972 doca->doca_cred);
973 if (error != 0) {
974 dsl_dir_rele(pdd, FTAG);
975 return (SET_ERROR(EDQUOT));
976 }
977 dsl_dir_rele(pdd, FTAG);
978
979 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin);
980 if (error != 0)
981 return (error);
982
983 /* You can only clone snapshots, not the head datasets. */
984 if (!origin->ds_is_snapshot) {
985 dsl_dataset_rele(origin, FTAG);
986 return (SET_ERROR(EINVAL));
987 }
988 dsl_dataset_rele(origin, FTAG);
989
990 return (0);
991 }
992
993 static void
dmu_objset_clone_sync(void * arg,dmu_tx_t * tx)994 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx)
995 {
996 dmu_objset_clone_arg_t *doca = arg;
997 dsl_pool_t *dp = dmu_tx_pool(tx);
998 dsl_dir_t *pdd;
999 const char *tail;
1000 dsl_dataset_t *origin, *ds;
1001 uint64_t obj;
1002 char namebuf[ZFS_MAX_DATASET_NAME_LEN];
1003
1004 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail));
1005 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin));
1006
1007 obj = dsl_dataset_create_sync(pdd, tail, origin, 0,
1008 doca->doca_cred, tx);
1009
1010 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds));
1011 dsl_dataset_name(origin, namebuf);
1012 spa_history_log_internal_ds(ds, "clone", tx,
1013 "origin=%s (%llu)", namebuf, origin->ds_object);
1014 dsl_dataset_rele(ds, FTAG);
1015 dsl_dataset_rele(origin, FTAG);
1016 dsl_dir_rele(pdd, FTAG);
1017 }
1018
1019 int
dmu_objset_clone(const char * clone,const char * origin)1020 dmu_objset_clone(const char *clone, const char *origin)
1021 {
1022 dmu_objset_clone_arg_t doca;
1023
1024 doca.doca_clone = clone;
1025 doca.doca_origin = origin;
1026 doca.doca_cred = CRED();
1027
1028 return (dsl_sync_task(clone,
1029 dmu_objset_clone_check, dmu_objset_clone_sync, &doca,
1030 5, ZFS_SPACE_CHECK_NORMAL));
1031 }
1032
1033 int
dmu_objset_snapshot_one(const char * fsname,const char * snapname)1034 dmu_objset_snapshot_one(const char *fsname, const char *snapname)
1035 {
1036 int err;
1037 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname);
1038 nvlist_t *snaps = fnvlist_alloc();
1039
1040 fnvlist_add_boolean(snaps, longsnap);
1041 strfree(longsnap);
1042 err = dsl_dataset_snapshot(snaps, NULL, NULL);
1043 fnvlist_free(snaps);
1044 return (err);
1045 }
1046
1047 static void
dmu_objset_sync_dnodes(list_t * list,list_t * newlist,dmu_tx_t * tx)1048 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx)
1049 {
1050 dnode_t *dn;
1051
1052 while (dn = list_head(list)) {
1053 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
1054 ASSERT(dn->dn_dbuf->db_data_pending);
1055 /*
1056 * Initialize dn_zio outside dnode_sync() because the
1057 * meta-dnode needs to set it ouside dnode_sync().
1058 */
1059 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio;
1060 ASSERT(dn->dn_zio);
1061
1062 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS);
1063 list_remove(list, dn);
1064
1065 if (newlist) {
1066 (void) dnode_add_ref(dn, newlist);
1067 list_insert_tail(newlist, dn);
1068 }
1069
1070 dnode_sync(dn, tx);
1071 }
1072 }
1073
1074 /* ARGSUSED */
1075 static void
dmu_objset_write_ready(zio_t * zio,arc_buf_t * abuf,void * arg)1076 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg)
1077 {
1078 blkptr_t *bp = zio->io_bp;
1079 objset_t *os = arg;
1080 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode;
1081
1082 ASSERT(!BP_IS_EMBEDDED(bp));
1083 ASSERT3P(bp, ==, os->os_rootbp);
1084 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET);
1085 ASSERT0(BP_GET_LEVEL(bp));
1086
1087 /*
1088 * Update rootbp fill count: it should be the number of objects
1089 * allocated in the object set (not counting the "special"
1090 * objects that are stored in the objset_phys_t -- the meta
1091 * dnode and user/group accounting objects).
1092 */
1093 bp->blk_fill = 0;
1094 for (int i = 0; i < dnp->dn_nblkptr; i++)
1095 bp->blk_fill += BP_GET_FILL(&dnp->dn_blkptr[i]);
1096 }
1097
1098 /* ARGSUSED */
1099 static void
dmu_objset_write_done(zio_t * zio,arc_buf_t * abuf,void * arg)1100 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg)
1101 {
1102 blkptr_t *bp = zio->io_bp;
1103 blkptr_t *bp_orig = &zio->io_bp_orig;
1104 objset_t *os = arg;
1105
1106 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
1107 ASSERT(BP_EQUAL(bp, bp_orig));
1108 } else {
1109 dsl_dataset_t *ds = os->os_dsl_dataset;
1110 dmu_tx_t *tx = os->os_synctx;
1111
1112 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
1113 dsl_dataset_block_born(ds, bp, tx);
1114 }
1115 }
1116
1117 /* called from dsl */
1118 void
dmu_objset_sync(objset_t * os,zio_t * pio,dmu_tx_t * tx)1119 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
1120 {
1121 int txgoff;
1122 zbookmark_phys_t zb;
1123 zio_prop_t zp;
1124 zio_t *zio;
1125 list_t *list;
1126 list_t *newlist = NULL;
1127 dbuf_dirty_record_t *dr;
1128
1129 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);
1130
1131 ASSERT(dmu_tx_is_syncing(tx));
1132 /* XXX the write_done callback should really give us the tx... */
1133 os->os_synctx = tx;
1134
1135 if (os->os_dsl_dataset == NULL) {
1136 /*
1137 * This is the MOS. If we have upgraded,
1138 * spa_max_replication() could change, so reset
1139 * os_copies here.
1140 */
1141 os->os_copies = spa_max_replication(os->os_spa);
1142 }
1143
1144 /*
1145 * Create the root block IO
1146 */
1147 SET_BOOKMARK(&zb, os->os_dsl_dataset ?
1148 os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
1149 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
1150 arc_release(os->os_phys_buf, &os->os_phys_buf);
1151
1152 dmu_write_policy(os, NULL, 0, 0, &zp);
1153
1154 zio = arc_write(pio, os->os_spa, tx->tx_txg,
1155 os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os),
1156 DMU_OS_IS_L2COMPRESSIBLE(os), &zp, dmu_objset_write_ready,
1157 NULL, dmu_objset_write_done, os, ZIO_PRIORITY_ASYNC_WRITE,
1158 ZIO_FLAG_MUSTSUCCEED, &zb);
1159
1160 /*
1161 * Sync special dnodes - the parent IO for the sync is the root block
1162 */
1163 DMU_META_DNODE(os)->dn_zio = zio;
1164 dnode_sync(DMU_META_DNODE(os), tx);
1165
1166 os->os_phys->os_flags = os->os_flags;
1167
1168 if (DMU_USERUSED_DNODE(os) &&
1169 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) {
1170 DMU_USERUSED_DNODE(os)->dn_zio = zio;
1171 dnode_sync(DMU_USERUSED_DNODE(os), tx);
1172 DMU_GROUPUSED_DNODE(os)->dn_zio = zio;
1173 dnode_sync(DMU_GROUPUSED_DNODE(os), tx);
1174 }
1175
1176 txgoff = tx->tx_txg & TXG_MASK;
1177
1178 if (dmu_objset_userused_enabled(os)) {
1179 newlist = &os->os_synced_dnodes;
1180 /*
1181 * We must create the list here because it uses the
1182 * dn_dirty_link[] of this txg.
1183 */
1184 list_create(newlist, sizeof (dnode_t),
1185 offsetof(dnode_t, dn_dirty_link[txgoff]));
1186 }
1187
1188 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx);
1189 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx);
1190
1191 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff];
1192 while (dr = list_head(list)) {
1193 ASSERT0(dr->dr_dbuf->db_level);
1194 list_remove(list, dr);
1195 if (dr->dr_zio)
1196 zio_nowait(dr->dr_zio);
1197 }
1198 /*
1199 * Free intent log blocks up to this tx.
1200 */
1201 zil_sync(os->os_zil, tx);
1202 os->os_phys->os_zil_header = os->os_zil_header;
1203 zio_nowait(zio);
1204 }
1205
1206 boolean_t
dmu_objset_is_dirty(objset_t * os,uint64_t txg)1207 dmu_objset_is_dirty(objset_t *os, uint64_t txg)
1208 {
1209 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) ||
1210 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK]));
1211 }
1212
1213 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES];
1214
1215 void
dmu_objset_register_type(dmu_objset_type_t ost,objset_used_cb_t * cb)1216 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb)
1217 {
1218 used_cbs[ost] = cb;
1219 }
1220
1221 boolean_t
dmu_objset_userused_enabled(objset_t * os)1222 dmu_objset_userused_enabled(objset_t *os)
1223 {
1224 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE &&
1225 used_cbs[os->os_phys->os_type] != NULL &&
1226 DMU_USERUSED_DNODE(os) != NULL);
1227 }
1228
1229 static void
do_userquota_update(objset_t * os,uint64_t used,uint64_t flags,uint64_t user,uint64_t group,boolean_t subtract,dmu_tx_t * tx)1230 do_userquota_update(objset_t *os, uint64_t used, uint64_t flags,
1231 uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx)
1232 {
1233 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) {
1234 int64_t delta = DNODE_SIZE + used;
1235 if (subtract)
1236 delta = -delta;
1237 VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT,
1238 user, delta, tx));
1239 VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT,
1240 group, delta, tx));
1241 }
1242 }
1243
1244 void
dmu_objset_do_userquota_updates(objset_t * os,dmu_tx_t * tx)1245 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx)
1246 {
1247 dnode_t *dn;
1248 list_t *list = &os->os_synced_dnodes;
1249
1250 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
1251
1252 while (dn = list_head(list)) {
1253 int flags;
1254 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object));
1255 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE ||
1256 dn->dn_phys->dn_flags &
1257 DNODE_FLAG_USERUSED_ACCOUNTED);
1258
1259 /* Allocate the user/groupused objects if necessary. */
1260 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) {
1261 VERIFY(0 == zap_create_claim(os,
1262 DMU_USERUSED_OBJECT,
1263 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1264 VERIFY(0 == zap_create_claim(os,
1265 DMU_GROUPUSED_OBJECT,
1266 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1267 }
1268
1269 /*
1270 * We intentionally modify the zap object even if the
1271 * net delta is zero. Otherwise
1272 * the block of the zap obj could be shared between
1273 * datasets but need to be different between them after
1274 * a bprewrite.
1275 */
1276
1277 flags = dn->dn_id_flags;
1278 ASSERT(flags);
1279 if (flags & DN_ID_OLD_EXIST) {
1280 do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags,
1281 dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx);
1282 }
1283 if (flags & DN_ID_NEW_EXIST) {
1284 do_userquota_update(os, DN_USED_BYTES(dn->dn_phys),
1285 dn->dn_phys->dn_flags, dn->dn_newuid,
1286 dn->dn_newgid, B_FALSE, tx);
1287 }
1288
1289 mutex_enter(&dn->dn_mtx);
1290 dn->dn_oldused = 0;
1291 dn->dn_oldflags = 0;
1292 if (dn->dn_id_flags & DN_ID_NEW_EXIST) {
1293 dn->dn_olduid = dn->dn_newuid;
1294 dn->dn_oldgid = dn->dn_newgid;
1295 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1296 if (dn->dn_bonuslen == 0)
1297 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1298 else
1299 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1300 }
1301 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST);
1302 mutex_exit(&dn->dn_mtx);
1303
1304 list_remove(list, dn);
1305 dnode_rele(dn, list);
1306 }
1307 }
1308
1309 /*
1310 * Returns a pointer to data to find uid/gid from
1311 *
1312 * If a dirty record for transaction group that is syncing can't
1313 * be found then NULL is returned. In the NULL case it is assumed
1314 * the uid/gid aren't changing.
1315 */
1316 static void *
dmu_objset_userquota_find_data(dmu_buf_impl_t * db,dmu_tx_t * tx)1317 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx)
1318 {
1319 dbuf_dirty_record_t *dr, **drp;
1320 void *data;
1321
1322 if (db->db_dirtycnt == 0)
1323 return (db->db.db_data); /* Nothing is changing */
1324
1325 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next)
1326 if (dr->dr_txg == tx->tx_txg)
1327 break;
1328
1329 if (dr == NULL) {
1330 data = NULL;
1331 } else {
1332 dnode_t *dn;
1333
1334 DB_DNODE_ENTER(dr->dr_dbuf);
1335 dn = DB_DNODE(dr->dr_dbuf);
1336
1337 if (dn->dn_bonuslen == 0 &&
1338 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID)
1339 data = dr->dt.dl.dr_data->b_data;
1340 else
1341 data = dr->dt.dl.dr_data;
1342
1343 DB_DNODE_EXIT(dr->dr_dbuf);
1344 }
1345
1346 return (data);
1347 }
1348
1349 void
dmu_objset_userquota_get_ids(dnode_t * dn,boolean_t before,dmu_tx_t * tx)1350 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx)
1351 {
1352 objset_t *os = dn->dn_objset;
1353 void *data = NULL;
1354 dmu_buf_impl_t *db = NULL;
1355 uint64_t *user = NULL;
1356 uint64_t *group = NULL;
1357 int flags = dn->dn_id_flags;
1358 int error;
1359 boolean_t have_spill = B_FALSE;
1360
1361 if (!dmu_objset_userused_enabled(dn->dn_objset))
1362 return;
1363
1364 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST|
1365 DN_ID_CHKED_SPILL)))
1366 return;
1367
1368 if (before && dn->dn_bonuslen != 0)
1369 data = DN_BONUS(dn->dn_phys);
1370 else if (!before && dn->dn_bonuslen != 0) {
1371 if (dn->dn_bonus) {
1372 db = dn->dn_bonus;
1373 mutex_enter(&db->db_mtx);
1374 data = dmu_objset_userquota_find_data(db, tx);
1375 } else {
1376 data = DN_BONUS(dn->dn_phys);
1377 }
1378 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) {
1379 int rf = 0;
1380
1381 if (RW_WRITE_HELD(&dn->dn_struct_rwlock))
1382 rf |= DB_RF_HAVESTRUCT;
1383 error = dmu_spill_hold_by_dnode(dn,
1384 rf | DB_RF_MUST_SUCCEED,
1385 FTAG, (dmu_buf_t **)&db);
1386 ASSERT(error == 0);
1387 mutex_enter(&db->db_mtx);
1388 data = (before) ? db->db.db_data :
1389 dmu_objset_userquota_find_data(db, tx);
1390 have_spill = B_TRUE;
1391 } else {
1392 mutex_enter(&dn->dn_mtx);
1393 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1394 mutex_exit(&dn->dn_mtx);
1395 return;
1396 }
1397
1398 if (before) {
1399 ASSERT(data);
1400 user = &dn->dn_olduid;
1401 group = &dn->dn_oldgid;
1402 } else if (data) {
1403 user = &dn->dn_newuid;
1404 group = &dn->dn_newgid;
1405 }
1406
1407 /*
1408 * Must always call the callback in case the object
1409 * type has changed and that type isn't an object type to track
1410 */
1411 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data,
1412 user, group);
1413
1414 /*
1415 * Preserve existing uid/gid when the callback can't determine
1416 * what the new uid/gid are and the callback returned EEXIST.
1417 * The EEXIST error tells us to just use the existing uid/gid.
1418 * If we don't know what the old values are then just assign
1419 * them to 0, since that is a new file being created.
1420 */
1421 if (!before && data == NULL && error == EEXIST) {
1422 if (flags & DN_ID_OLD_EXIST) {
1423 dn->dn_newuid = dn->dn_olduid;
1424 dn->dn_newgid = dn->dn_oldgid;
1425 } else {
1426 dn->dn_newuid = 0;
1427 dn->dn_newgid = 0;
1428 }
1429 error = 0;
1430 }
1431
1432 if (db)
1433 mutex_exit(&db->db_mtx);
1434
1435 mutex_enter(&dn->dn_mtx);
1436 if (error == 0 && before)
1437 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1438 if (error == 0 && !before)
1439 dn->dn_id_flags |= DN_ID_NEW_EXIST;
1440
1441 if (have_spill) {
1442 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1443 } else {
1444 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1445 }
1446 mutex_exit(&dn->dn_mtx);
1447 if (have_spill)
1448 dmu_buf_rele((dmu_buf_t *)db, FTAG);
1449 }
1450
1451 boolean_t
dmu_objset_userspace_present(objset_t * os)1452 dmu_objset_userspace_present(objset_t *os)
1453 {
1454 return (os->os_phys->os_flags &
1455 OBJSET_FLAG_USERACCOUNTING_COMPLETE);
1456 }
1457
1458 int
dmu_objset_userspace_upgrade(objset_t * os)1459 dmu_objset_userspace_upgrade(objset_t *os)
1460 {
1461 uint64_t obj;
1462 int err = 0;
1463
1464 if (dmu_objset_userspace_present(os))
1465 return (0);
1466 if (!dmu_objset_userused_enabled(os))
1467 return (SET_ERROR(ENOTSUP));
1468 if (dmu_objset_is_snapshot(os))
1469 return (SET_ERROR(EINVAL));
1470
1471 /*
1472 * We simply need to mark every object dirty, so that it will be
1473 * synced out and now accounted. If this is called
1474 * concurrently, or if we already did some work before crashing,
1475 * that's fine, since we track each object's accounted state
1476 * independently.
1477 */
1478
1479 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) {
1480 dmu_tx_t *tx;
1481 dmu_buf_t *db;
1482 int objerr;
1483
1484 if (issig(JUSTLOOKING) && issig(FORREAL))
1485 return (SET_ERROR(EINTR));
1486
1487 objerr = dmu_bonus_hold(os, obj, FTAG, &db);
1488 if (objerr != 0)
1489 continue;
1490 tx = dmu_tx_create(os);
1491 dmu_tx_hold_bonus(tx, obj);
1492 objerr = dmu_tx_assign(tx, TXG_WAIT);
1493 if (objerr != 0) {
1494 dmu_tx_abort(tx);
1495 continue;
1496 }
1497 dmu_buf_will_dirty(db, tx);
1498 dmu_buf_rele(db, FTAG);
1499 dmu_tx_commit(tx);
1500 }
1501
1502 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
1503 txg_wait_synced(dmu_objset_pool(os), 0);
1504 return (0);
1505 }
1506
1507 void
dmu_objset_space(objset_t * os,uint64_t * refdbytesp,uint64_t * availbytesp,uint64_t * usedobjsp,uint64_t * availobjsp)1508 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
1509 uint64_t *usedobjsp, uint64_t *availobjsp)
1510 {
1511 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp,
1512 usedobjsp, availobjsp);
1513 }
1514
1515 uint64_t
dmu_objset_fsid_guid(objset_t * os)1516 dmu_objset_fsid_guid(objset_t *os)
1517 {
1518 return (dsl_dataset_fsid_guid(os->os_dsl_dataset));
1519 }
1520
1521 void
dmu_objset_fast_stat(objset_t * os,dmu_objset_stats_t * stat)1522 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat)
1523 {
1524 stat->dds_type = os->os_phys->os_type;
1525 if (os->os_dsl_dataset)
1526 dsl_dataset_fast_stat(os->os_dsl_dataset, stat);
1527 }
1528
1529 void
dmu_objset_stats(objset_t * os,nvlist_t * nv)1530 dmu_objset_stats(objset_t *os, nvlist_t *nv)
1531 {
1532 ASSERT(os->os_dsl_dataset ||
1533 os->os_phys->os_type == DMU_OST_META);
1534
1535 if (os->os_dsl_dataset != NULL)
1536 dsl_dataset_stats(os->os_dsl_dataset, nv);
1537
1538 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
1539 os->os_phys->os_type);
1540 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING,
1541 dmu_objset_userspace_present(os));
1542 }
1543
1544 int
dmu_objset_is_snapshot(objset_t * os)1545 dmu_objset_is_snapshot(objset_t *os)
1546 {
1547 if (os->os_dsl_dataset != NULL)
1548 return (os->os_dsl_dataset->ds_is_snapshot);
1549 else
1550 return (B_FALSE);
1551 }
1552
1553 int
dmu_snapshot_realname(objset_t * os,char * name,char * real,int maxlen,boolean_t * conflict)1554 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
1555 boolean_t *conflict)
1556 {
1557 dsl_dataset_t *ds = os->os_dsl_dataset;
1558 uint64_t ignored;
1559
1560 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0)
1561 return (SET_ERROR(ENOENT));
1562
1563 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset,
1564 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored,
1565 MT_FIRST, real, maxlen, conflict));
1566 }
1567
1568 int
dmu_snapshot_list_next(objset_t * os,int namelen,char * name,uint64_t * idp,uint64_t * offp,boolean_t * case_conflict)1569 dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
1570 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict)
1571 {
1572 dsl_dataset_t *ds = os->os_dsl_dataset;
1573 zap_cursor_t cursor;
1574 zap_attribute_t attr;
1575
1576 ASSERT(dsl_pool_config_held(dmu_objset_pool(os)));
1577
1578 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0)
1579 return (SET_ERROR(ENOENT));
1580
1581 zap_cursor_init_serialized(&cursor,
1582 ds->ds_dir->dd_pool->dp_meta_objset,
1583 dsl_dataset_phys(ds)->ds_snapnames_zapobj, *offp);
1584
1585 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1586 zap_cursor_fini(&cursor);
1587 return (SET_ERROR(ENOENT));
1588 }
1589
1590 if (strlen(attr.za_name) + 1 > namelen) {
1591 zap_cursor_fini(&cursor);
1592 return (SET_ERROR(ENAMETOOLONG));
1593 }
1594
1595 (void) strcpy(name, attr.za_name);
1596 if (idp)
1597 *idp = attr.za_first_integer;
1598 if (case_conflict)
1599 *case_conflict = attr.za_normalization_conflict;
1600 zap_cursor_advance(&cursor);
1601 *offp = zap_cursor_serialize(&cursor);
1602 zap_cursor_fini(&cursor);
1603
1604 return (0);
1605 }
1606
1607 int
dmu_dir_list_next(objset_t * os,int namelen,char * name,uint64_t * idp,uint64_t * offp)1608 dmu_dir_list_next(objset_t *os, int namelen, char *name,
1609 uint64_t *idp, uint64_t *offp)
1610 {
1611 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir;
1612 zap_cursor_t cursor;
1613 zap_attribute_t attr;
1614
1615 /* there is no next dir on a snapshot! */
1616 if (os->os_dsl_dataset->ds_object !=
1617 dsl_dir_phys(dd)->dd_head_dataset_obj)
1618 return (SET_ERROR(ENOENT));
1619
1620 zap_cursor_init_serialized(&cursor,
1621 dd->dd_pool->dp_meta_objset,
1622 dsl_dir_phys(dd)->dd_child_dir_zapobj, *offp);
1623
1624 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1625 zap_cursor_fini(&cursor);
1626 return (SET_ERROR(ENOENT));
1627 }
1628
1629 if (strlen(attr.za_name) + 1 > namelen) {
1630 zap_cursor_fini(&cursor);
1631 return (SET_ERROR(ENAMETOOLONG));
1632 }
1633
1634 (void) strcpy(name, attr.za_name);
1635 if (idp)
1636 *idp = attr.za_first_integer;
1637 zap_cursor_advance(&cursor);
1638 *offp = zap_cursor_serialize(&cursor);
1639 zap_cursor_fini(&cursor);
1640
1641 return (0);
1642 }
1643
1644 typedef struct dmu_objset_find_ctx {
1645 taskq_t *dc_tq;
1646 dsl_pool_t *dc_dp;
1647 uint64_t dc_ddobj;
1648 int (*dc_func)(dsl_pool_t *, dsl_dataset_t *, void *);
1649 void *dc_arg;
1650 int dc_flags;
1651 kmutex_t *dc_error_lock;
1652 int *dc_error;
1653 } dmu_objset_find_ctx_t;
1654
1655 static void
dmu_objset_find_dp_impl(dmu_objset_find_ctx_t * dcp)1656 dmu_objset_find_dp_impl(dmu_objset_find_ctx_t *dcp)
1657 {
1658 dsl_pool_t *dp = dcp->dc_dp;
1659 dmu_objset_find_ctx_t *child_dcp;
1660 dsl_dir_t *dd;
1661 dsl_dataset_t *ds;
1662 zap_cursor_t zc;
1663 zap_attribute_t *attr;
1664 uint64_t thisobj;
1665 int err = 0;
1666
1667 /* don't process if there already was an error */
1668 if (*dcp->dc_error != 0)
1669 goto out;
1670
1671 err = dsl_dir_hold_obj(dp, dcp->dc_ddobj, NULL, FTAG, &dd);
1672 if (err != 0)
1673 goto out;
1674
1675 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1676 if (dd->dd_myname[0] == '$') {
1677 dsl_dir_rele(dd, FTAG);
1678 goto out;
1679 }
1680
1681 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj;
1682 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1683
1684 /*
1685 * Iterate over all children.
1686 */
1687 if (dcp->dc_flags & DS_FIND_CHILDREN) {
1688 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1689 dsl_dir_phys(dd)->dd_child_dir_zapobj);
1690 zap_cursor_retrieve(&zc, attr) == 0;
1691 (void) zap_cursor_advance(&zc)) {
1692 ASSERT3U(attr->za_integer_length, ==,
1693 sizeof (uint64_t));
1694 ASSERT3U(attr->za_num_integers, ==, 1);
1695
1696 child_dcp = kmem_alloc(sizeof (*child_dcp), KM_SLEEP);
1697 *child_dcp = *dcp;
1698 child_dcp->dc_ddobj = attr->za_first_integer;
1699 if (dcp->dc_tq != NULL)
1700 (void) taskq_dispatch(dcp->dc_tq,
1701 dmu_objset_find_dp_cb, child_dcp, TQ_SLEEP);
1702 else
1703 dmu_objset_find_dp_impl(child_dcp);
1704 }
1705 zap_cursor_fini(&zc);
1706 }
1707
1708 /*
1709 * Iterate over all snapshots.
1710 */
1711 if (dcp->dc_flags & DS_FIND_SNAPSHOTS) {
1712 dsl_dataset_t *ds;
1713 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1714
1715 if (err == 0) {
1716 uint64_t snapobj;
1717
1718 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
1719 dsl_dataset_rele(ds, FTAG);
1720
1721 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1722 zap_cursor_retrieve(&zc, attr) == 0;
1723 (void) zap_cursor_advance(&zc)) {
1724 ASSERT3U(attr->za_integer_length, ==,
1725 sizeof (uint64_t));
1726 ASSERT3U(attr->za_num_integers, ==, 1);
1727
1728 err = dsl_dataset_hold_obj(dp,
1729 attr->za_first_integer, FTAG, &ds);
1730 if (err != 0)
1731 break;
1732 err = dcp->dc_func(dp, ds, dcp->dc_arg);
1733 dsl_dataset_rele(ds, FTAG);
1734 if (err != 0)
1735 break;
1736 }
1737 zap_cursor_fini(&zc);
1738 }
1739 }
1740
1741 dsl_dir_rele(dd, FTAG);
1742 kmem_free(attr, sizeof (zap_attribute_t));
1743
1744 if (err != 0)
1745 goto out;
1746
1747 /*
1748 * Apply to self.
1749 */
1750 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1751 if (err != 0)
1752 goto out;
1753 err = dcp->dc_func(dp, ds, dcp->dc_arg);
1754 dsl_dataset_rele(ds, FTAG);
1755
1756 out:
1757 if (err != 0) {
1758 mutex_enter(dcp->dc_error_lock);
1759 /* only keep first error */
1760 if (*dcp->dc_error == 0)
1761 *dcp->dc_error = err;
1762 mutex_exit(dcp->dc_error_lock);
1763 }
1764
1765 kmem_free(dcp, sizeof (*dcp));
1766 }
1767
1768 static void
dmu_objset_find_dp_cb(void * arg)1769 dmu_objset_find_dp_cb(void *arg)
1770 {
1771 dmu_objset_find_ctx_t *dcp = arg;
1772 dsl_pool_t *dp = dcp->dc_dp;
1773
1774 /*
1775 * We need to get a pool_config_lock here, as there are several
1776 * asssert(pool_config_held) down the stack. Getting a lock via
1777 * dsl_pool_config_enter is risky, as it might be stalled by a
1778 * pending writer. This would deadlock, as the write lock can
1779 * only be granted when our parent thread gives up the lock.
1780 * The _prio interface gives us priority over a pending writer.
1781 */
1782 dsl_pool_config_enter_prio(dp, FTAG);
1783
1784 dmu_objset_find_dp_impl(dcp);
1785
1786 dsl_pool_config_exit(dp, FTAG);
1787 }
1788
1789 /*
1790 * Find objsets under and including ddobj, call func(ds) on each.
1791 * The order for the enumeration is completely undefined.
1792 * func is called with dsl_pool_config held.
1793 */
1794 int
dmu_objset_find_dp(dsl_pool_t * dp,uint64_t ddobj,int func (dsl_pool_t *,dsl_dataset_t *,void *),void * arg,int flags)1795 dmu_objset_find_dp(dsl_pool_t *dp, uint64_t ddobj,
1796 int func(dsl_pool_t *, dsl_dataset_t *, void *), void *arg, int flags)
1797 {
1798 int error = 0;
1799 taskq_t *tq = NULL;
1800 int ntasks;
1801 dmu_objset_find_ctx_t *dcp;
1802 kmutex_t err_lock;
1803
1804 mutex_init(&err_lock, NULL, MUTEX_DEFAULT, NULL);
1805 dcp = kmem_alloc(sizeof (*dcp), KM_SLEEP);
1806 dcp->dc_tq = NULL;
1807 dcp->dc_dp = dp;
1808 dcp->dc_ddobj = ddobj;
1809 dcp->dc_func = func;
1810 dcp->dc_arg = arg;
1811 dcp->dc_flags = flags;
1812 dcp->dc_error_lock = &err_lock;
1813 dcp->dc_error = &error;
1814
1815 if ((flags & DS_FIND_SERIALIZE) || dsl_pool_config_held_writer(dp)) {
1816 /*
1817 * In case a write lock is held we can't make use of
1818 * parallelism, as down the stack of the worker threads
1819 * the lock is asserted via dsl_pool_config_held.
1820 * In case of a read lock this is solved by getting a read
1821 * lock in each worker thread, which isn't possible in case
1822 * of a writer lock. So we fall back to the synchronous path
1823 * here.
1824 * In the future it might be possible to get some magic into
1825 * dsl_pool_config_held in a way that it returns true for
1826 * the worker threads so that a single lock held from this
1827 * thread suffices. For now, stay single threaded.
1828 */
1829 dmu_objset_find_dp_impl(dcp);
1830
1831 return (error);
1832 }
1833
1834 ntasks = dmu_find_threads;
1835 if (ntasks == 0)
1836 ntasks = vdev_count_leaves(dp->dp_spa) * 4;
1837 tq = taskq_create("dmu_objset_find", ntasks, minclsyspri, ntasks,
1838 INT_MAX, 0);
1839 if (tq == NULL) {
1840 kmem_free(dcp, sizeof (*dcp));
1841 return (SET_ERROR(ENOMEM));
1842 }
1843 dcp->dc_tq = tq;
1844
1845 /* dcp will be freed by task */
1846 (void) taskq_dispatch(tq, dmu_objset_find_dp_cb, dcp, TQ_SLEEP);
1847
1848 /*
1849 * PORTING: this code relies on the property of taskq_wait to wait
1850 * until no more tasks are queued and no more tasks are active. As
1851 * we always queue new tasks from within other tasks, task_wait
1852 * reliably waits for the full recursion to finish, even though we
1853 * enqueue new tasks after taskq_wait has been called.
1854 * On platforms other than illumos, taskq_wait may not have this
1855 * property.
1856 */
1857 taskq_wait(tq);
1858 taskq_destroy(tq);
1859 mutex_destroy(&err_lock);
1860
1861 return (error);
1862 }
1863
1864 /*
1865 * Find all objsets under name, and for each, call 'func(child_name, arg)'.
1866 * The dp_config_rwlock must not be held when this is called, and it
1867 * will not be held when the callback is called.
1868 * Therefore this function should only be used when the pool is not changing
1869 * (e.g. in syncing context), or the callback can deal with the possible races.
1870 */
1871 static int
dmu_objset_find_impl(spa_t * spa,const char * name,int func (const char *,void *),void * arg,int flags)1872 dmu_objset_find_impl(spa_t *spa, const char *name,
1873 int func(const char *, void *), void *arg, int flags)
1874 {
1875 dsl_dir_t *dd;
1876 dsl_pool_t *dp = spa_get_dsl(spa);
1877 dsl_dataset_t *ds;
1878 zap_cursor_t zc;
1879 zap_attribute_t *attr;
1880 char *child;
1881 uint64_t thisobj;
1882 int err;
1883
1884 dsl_pool_config_enter(dp, FTAG);
1885
1886 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL);
1887 if (err != 0) {
1888 dsl_pool_config_exit(dp, FTAG);
1889 return (err);
1890 }
1891
1892 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1893 if (dd->dd_myname[0] == '$') {
1894 dsl_dir_rele(dd, FTAG);
1895 dsl_pool_config_exit(dp, FTAG);
1896 return (0);
1897 }
1898
1899 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj;
1900 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1901
1902 /*
1903 * Iterate over all children.
1904 */
1905 if (flags & DS_FIND_CHILDREN) {
1906 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1907 dsl_dir_phys(dd)->dd_child_dir_zapobj);
1908 zap_cursor_retrieve(&zc, attr) == 0;
1909 (void) zap_cursor_advance(&zc)) {
1910 ASSERT3U(attr->za_integer_length, ==,
1911 sizeof (uint64_t));
1912 ASSERT3U(attr->za_num_integers, ==, 1);
1913
1914 child = kmem_asprintf("%s/%s", name, attr->za_name);
1915 dsl_pool_config_exit(dp, FTAG);
1916 err = dmu_objset_find_impl(spa, child,
1917 func, arg, flags);
1918 dsl_pool_config_enter(dp, FTAG);
1919 strfree(child);
1920 if (err != 0)
1921 break;
1922 }
1923 zap_cursor_fini(&zc);
1924
1925 if (err != 0) {
1926 dsl_dir_rele(dd, FTAG);
1927 dsl_pool_config_exit(dp, FTAG);
1928 kmem_free(attr, sizeof (zap_attribute_t));
1929 return (err);
1930 }
1931 }
1932
1933 /*
1934 * Iterate over all snapshots.
1935 */
1936 if (flags & DS_FIND_SNAPSHOTS) {
1937 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1938
1939 if (err == 0) {
1940 uint64_t snapobj;
1941
1942 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
1943 dsl_dataset_rele(ds, FTAG);
1944
1945 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1946 zap_cursor_retrieve(&zc, attr) == 0;
1947 (void) zap_cursor_advance(&zc)) {
1948 ASSERT3U(attr->za_integer_length, ==,
1949 sizeof (uint64_t));
1950 ASSERT3U(attr->za_num_integers, ==, 1);
1951
1952 child = kmem_asprintf("%s@%s",
1953 name, attr->za_name);
1954 dsl_pool_config_exit(dp, FTAG);
1955 err = func(child, arg);
1956 dsl_pool_config_enter(dp, FTAG);
1957 strfree(child);
1958 if (err != 0)
1959 break;
1960 }
1961 zap_cursor_fini(&zc);
1962 }
1963 }
1964
1965 dsl_dir_rele(dd, FTAG);
1966 kmem_free(attr, sizeof (zap_attribute_t));
1967 dsl_pool_config_exit(dp, FTAG);
1968
1969 if (err != 0)
1970 return (err);
1971
1972 /* Apply to self. */
1973 return (func(name, arg));
1974 }
1975
1976 /*
1977 * See comment above dmu_objset_find_impl().
1978 */
1979 int
dmu_objset_find(char * name,int func (const char *,void *),void * arg,int flags)1980 dmu_objset_find(char *name, int func(const char *, void *), void *arg,
1981 int flags)
1982 {
1983 spa_t *spa;
1984 int error;
1985
1986 error = spa_open(name, &spa, FTAG);
1987 if (error != 0)
1988 return (error);
1989 error = dmu_objset_find_impl(spa, name, func, arg, flags);
1990 spa_close(spa, FTAG);
1991 return (error);
1992 }
1993
1994 void
dmu_objset_set_user(objset_t * os,void * user_ptr)1995 dmu_objset_set_user(objset_t *os, void *user_ptr)
1996 {
1997 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1998 os->os_user_ptr = user_ptr;
1999 }
2000
2001 void *
dmu_objset_get_user(objset_t * os)2002 dmu_objset_get_user(objset_t *os)
2003 {
2004 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
2005 return (os->os_user_ptr);
2006 }
2007
2008 /*
2009 * Determine name of filesystem, given name of snapshot.
2010 * buf must be at least ZFS_MAX_DATASET_NAME_LEN bytes
2011 */
2012 int
dmu_fsname(const char * snapname,char * buf)2013 dmu_fsname(const char *snapname, char *buf)
2014 {
2015 char *atp = strchr(snapname, '@');
2016 if (atp == NULL)
2017 return (SET_ERROR(EINVAL));
2018 if (atp - snapname >= ZFS_MAX_DATASET_NAME_LEN)
2019 return (SET_ERROR(ENAMETOOLONG));
2020 (void) strlcpy(buf, snapname, atp - snapname + 1);
2021 return (0);
2022 }
2023