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 * Copyright (c) 2014 Integros [integros.com]
30 */
31
32 /* Portions Copyright 2010 Robert Milkowski */
33
34 #include <sys/cred.h>
35 #include <sys/zfs_context.h>
36 #include <sys/dmu_objset.h>
37 #include <sys/dsl_dir.h>
38 #include <sys/dsl_dataset.h>
39 #include <sys/dsl_prop.h>
40 #include <sys/dsl_pool.h>
41 #include <sys/dsl_synctask.h>
42 #include <sys/dsl_deleg.h>
43 #include <sys/dnode.h>
44 #include <sys/dbuf.h>
45 #include <sys/zvol.h>
46 #include <sys/dmu_tx.h>
47 #include <sys/zap.h>
48 #include <sys/zil.h>
49 #include <sys/dmu_impl.h>
50 #include <sys/zfs_ioctl.h>
51 #include <sys/sa.h>
52 #include <sys/zfs_onexit.h>
53 #include <sys/dsl_destroy.h>
54 #include <sys/vdev.h>
55
56 /*
57 * Needed to close a window in dnode_move() that allows the objset to be freed
58 * before it can be safely accessed.
59 */
60 krwlock_t os_lock;
61
62 /*
63 * Tunable to overwrite the maximum number of threads for the parallization
64 * of dmu_objset_find_dp, needed to speed up the import of pools with many
65 * datasets.
66 * Default is 4 times the number of leaf vdevs.
67 */
68 int dmu_find_threads = 0;
69
70 static void dmu_objset_find_dp_cb(void *arg);
71
72 void
dmu_objset_init(void)73 dmu_objset_init(void)
74 {
75 rw_init(&os_lock, NULL, RW_DEFAULT, NULL);
76 }
77
78 void
dmu_objset_fini(void)79 dmu_objset_fini(void)
80 {
81 rw_destroy(&os_lock);
82 }
83
84 spa_t *
dmu_objset_spa(objset_t * os)85 dmu_objset_spa(objset_t *os)
86 {
87 return (os->os_spa);
88 }
89
90 zilog_t *
dmu_objset_zil(objset_t * os)91 dmu_objset_zil(objset_t *os)
92 {
93 return (os->os_zil);
94 }
95
96 dsl_pool_t *
dmu_objset_pool(objset_t * os)97 dmu_objset_pool(objset_t *os)
98 {
99 dsl_dataset_t *ds;
100
101 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir)
102 return (ds->ds_dir->dd_pool);
103 else
104 return (spa_get_dsl(os->os_spa));
105 }
106
107 dsl_dataset_t *
dmu_objset_ds(objset_t * os)108 dmu_objset_ds(objset_t *os)
109 {
110 return (os->os_dsl_dataset);
111 }
112
113 dmu_objset_type_t
dmu_objset_type(objset_t * os)114 dmu_objset_type(objset_t *os)
115 {
116 return (os->os_phys->os_type);
117 }
118
119 void
dmu_objset_name(objset_t * os,char * buf)120 dmu_objset_name(objset_t *os, char *buf)
121 {
122 dsl_dataset_name(os->os_dsl_dataset, buf);
123 }
124
125 uint64_t
dmu_objset_id(objset_t * os)126 dmu_objset_id(objset_t *os)
127 {
128 dsl_dataset_t *ds = os->os_dsl_dataset;
129
130 return (ds ? ds->ds_object : 0);
131 }
132
133 zfs_sync_type_t
dmu_objset_syncprop(objset_t * os)134 dmu_objset_syncprop(objset_t *os)
135 {
136 return (os->os_sync);
137 }
138
139 zfs_logbias_op_t
dmu_objset_logbias(objset_t * os)140 dmu_objset_logbias(objset_t *os)
141 {
142 return (os->os_logbias);
143 }
144
145 static void
checksum_changed_cb(void * arg,uint64_t newval)146 checksum_changed_cb(void *arg, uint64_t newval)
147 {
148 objset_t *os = arg;
149
150 /*
151 * Inheritance should have been done by now.
152 */
153 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
154
155 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE);
156 }
157
158 static void
compression_changed_cb(void * arg,uint64_t newval)159 compression_changed_cb(void *arg, uint64_t newval)
160 {
161 objset_t *os = arg;
162
163 /*
164 * Inheritance and range checking should have been done by now.
165 */
166 ASSERT(newval != ZIO_COMPRESS_INHERIT);
167
168 os->os_compress = zio_compress_select(os->os_spa, newval,
169 ZIO_COMPRESS_ON);
170 }
171
172 static void
copies_changed_cb(void * arg,uint64_t newval)173 copies_changed_cb(void *arg, uint64_t newval)
174 {
175 objset_t *os = arg;
176
177 /*
178 * Inheritance and range checking should have been done by now.
179 */
180 ASSERT(newval > 0);
181 ASSERT(newval <= spa_max_replication(os->os_spa));
182
183 os->os_copies = newval;
184 }
185
186 static void
dedup_changed_cb(void * arg,uint64_t newval)187 dedup_changed_cb(void *arg, uint64_t newval)
188 {
189 objset_t *os = arg;
190 spa_t *spa = os->os_spa;
191 enum zio_checksum checksum;
192
193 /*
194 * Inheritance should have been done by now.
195 */
196 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
197
198 checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF);
199
200 os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK;
201 os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY);
202 }
203
204 static void
primary_cache_changed_cb(void * arg,uint64_t newval)205 primary_cache_changed_cb(void *arg, uint64_t newval)
206 {
207 objset_t *os = arg;
208
209 /*
210 * Inheritance and range checking should have been done by now.
211 */
212 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
213 newval == ZFS_CACHE_METADATA);
214
215 os->os_primary_cache = newval;
216 }
217
218 static void
secondary_cache_changed_cb(void * arg,uint64_t newval)219 secondary_cache_changed_cb(void *arg, uint64_t newval)
220 {
221 objset_t *os = arg;
222
223 /*
224 * Inheritance and range checking should have been done by now.
225 */
226 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
227 newval == ZFS_CACHE_METADATA);
228
229 os->os_secondary_cache = newval;
230 }
231
232 static void
sync_changed_cb(void * arg,uint64_t newval)233 sync_changed_cb(void *arg, uint64_t newval)
234 {
235 objset_t *os = arg;
236
237 /*
238 * Inheritance and range checking should have been done by now.
239 */
240 ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS ||
241 newval == ZFS_SYNC_DISABLED);
242
243 os->os_sync = newval;
244 if (os->os_zil)
245 zil_set_sync(os->os_zil, newval);
246 }
247
248 static void
redundant_metadata_changed_cb(void * arg,uint64_t newval)249 redundant_metadata_changed_cb(void *arg, uint64_t newval)
250 {
251 objset_t *os = arg;
252
253 /*
254 * Inheritance and range checking should have been done by now.
255 */
256 ASSERT(newval == ZFS_REDUNDANT_METADATA_ALL ||
257 newval == ZFS_REDUNDANT_METADATA_MOST);
258
259 os->os_redundant_metadata = newval;
260 }
261
262 static void
logbias_changed_cb(void * arg,uint64_t newval)263 logbias_changed_cb(void *arg, uint64_t newval)
264 {
265 objset_t *os = arg;
266
267 ASSERT(newval == ZFS_LOGBIAS_LATENCY ||
268 newval == ZFS_LOGBIAS_THROUGHPUT);
269 os->os_logbias = newval;
270 if (os->os_zil)
271 zil_set_logbias(os->os_zil, newval);
272 }
273
274 static void
recordsize_changed_cb(void * arg,uint64_t newval)275 recordsize_changed_cb(void *arg, uint64_t newval)
276 {
277 objset_t *os = arg;
278
279 os->os_recordsize = newval;
280 }
281
282 void
dmu_objset_byteswap(void * buf,size_t size)283 dmu_objset_byteswap(void *buf, size_t size)
284 {
285 objset_phys_t *osp = buf;
286
287 ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t));
288 dnode_byteswap(&osp->os_meta_dnode);
289 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t));
290 osp->os_type = BSWAP_64(osp->os_type);
291 osp->os_flags = BSWAP_64(osp->os_flags);
292 if (size == sizeof (objset_phys_t)) {
293 dnode_byteswap(&osp->os_userused_dnode);
294 dnode_byteswap(&osp->os_groupused_dnode);
295 }
296 }
297
298 int
dmu_objset_open_impl(spa_t * spa,dsl_dataset_t * ds,blkptr_t * bp,objset_t ** osp)299 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
300 objset_t **osp)
301 {
302 objset_t *os;
303 int i, err;
304
305 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock));
306
307 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP);
308 os->os_dsl_dataset = ds;
309 os->os_spa = spa;
310 os->os_rootbp = bp;
311 if (!BP_IS_HOLE(os->os_rootbp)) {
312 arc_flags_t aflags = ARC_FLAG_WAIT;
313 zbookmark_phys_t zb;
314 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
315 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
316
317 if (DMU_OS_IS_L2CACHEABLE(os))
318 aflags |= ARC_FLAG_L2CACHE;
319
320 dprintf_bp(os->os_rootbp, "reading %s", "");
321 err = arc_read(NULL, spa, os->os_rootbp,
322 arc_getbuf_func, &os->os_phys_buf,
323 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb);
324 if (err != 0) {
325 kmem_free(os, sizeof (objset_t));
326 /* convert checksum errors into IO errors */
327 if (err == ECKSUM)
328 err = SET_ERROR(EIO);
329 return (err);
330 }
331
332 /* Increase the blocksize if we are permitted. */
333 if (spa_version(spa) >= SPA_VERSION_USERSPACE &&
334 arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) {
335 arc_buf_t *buf = arc_alloc_buf(spa,
336 sizeof (objset_phys_t), &os->os_phys_buf,
337 ARC_BUFC_METADATA);
338 bzero(buf->b_data, sizeof (objset_phys_t));
339 bcopy(os->os_phys_buf->b_data, buf->b_data,
340 arc_buf_size(os->os_phys_buf));
341 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf);
342 os->os_phys_buf = buf;
343 }
344
345 os->os_phys = os->os_phys_buf->b_data;
346 os->os_flags = os->os_phys->os_flags;
347 } else {
348 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ?
349 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE;
350 os->os_phys_buf = arc_alloc_buf(spa, size,
351 &os->os_phys_buf, ARC_BUFC_METADATA);
352 os->os_phys = os->os_phys_buf->b_data;
353 bzero(os->os_phys, size);
354 }
355
356 /*
357 * Note: the changed_cb will be called once before the register
358 * func returns, thus changing the checksum/compression from the
359 * default (fletcher2/off). Snapshots don't need to know about
360 * checksum/compression/copies.
361 */
362 if (ds != NULL) {
363 boolean_t needlock = B_FALSE;
364
365 /*
366 * Note: it's valid to open the objset if the dataset is
367 * long-held, in which case the pool_config lock will not
368 * be held.
369 */
370 if (!dsl_pool_config_held(dmu_objset_pool(os))) {
371 needlock = B_TRUE;
372 dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
373 }
374 err = dsl_prop_register(ds,
375 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
376 primary_cache_changed_cb, os);
377 if (err == 0) {
378 err = dsl_prop_register(ds,
379 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
380 secondary_cache_changed_cb, os);
381 }
382 if (!ds->ds_is_snapshot) {
383 if (err == 0) {
384 err = dsl_prop_register(ds,
385 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
386 checksum_changed_cb, os);
387 }
388 if (err == 0) {
389 err = dsl_prop_register(ds,
390 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
391 compression_changed_cb, os);
392 }
393 if (err == 0) {
394 err = dsl_prop_register(ds,
395 zfs_prop_to_name(ZFS_PROP_COPIES),
396 copies_changed_cb, os);
397 }
398 if (err == 0) {
399 err = dsl_prop_register(ds,
400 zfs_prop_to_name(ZFS_PROP_DEDUP),
401 dedup_changed_cb, os);
402 }
403 if (err == 0) {
404 err = dsl_prop_register(ds,
405 zfs_prop_to_name(ZFS_PROP_LOGBIAS),
406 logbias_changed_cb, os);
407 }
408 if (err == 0) {
409 err = dsl_prop_register(ds,
410 zfs_prop_to_name(ZFS_PROP_SYNC),
411 sync_changed_cb, os);
412 }
413 if (err == 0) {
414 err = dsl_prop_register(ds,
415 zfs_prop_to_name(
416 ZFS_PROP_REDUNDANT_METADATA),
417 redundant_metadata_changed_cb, os);
418 }
419 if (err == 0) {
420 err = dsl_prop_register(ds,
421 zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
422 recordsize_changed_cb, os);
423 }
424 }
425 if (needlock)
426 dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
427 if (err != 0) {
428 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf);
429 kmem_free(os, sizeof (objset_t));
430 return (err);
431 }
432 } else {
433 /* It's the meta-objset. */
434 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
435 os->os_compress = ZIO_COMPRESS_ON;
436 os->os_copies = spa_max_replication(spa);
437 os->os_dedup_checksum = ZIO_CHECKSUM_OFF;
438 os->os_dedup_verify = B_FALSE;
439 os->os_logbias = ZFS_LOGBIAS_LATENCY;
440 os->os_sync = ZFS_SYNC_STANDARD;
441 os->os_primary_cache = ZFS_CACHE_ALL;
442 os->os_secondary_cache = ZFS_CACHE_ALL;
443 }
444
445 if (ds == NULL || !ds->ds_is_snapshot)
446 os->os_zil_header = os->os_phys->os_zil_header;
447 os->os_zil = zil_alloc(os, &os->os_zil_header);
448
449 for (i = 0; i < TXG_SIZE; i++) {
450 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t),
451 offsetof(dnode_t, dn_dirty_link[i]));
452 list_create(&os->os_free_dnodes[i], sizeof (dnode_t),
453 offsetof(dnode_t, dn_dirty_link[i]));
454 }
455 list_create(&os->os_dnodes, sizeof (dnode_t),
456 offsetof(dnode_t, dn_link));
457 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
458 offsetof(dmu_buf_impl_t, db_link));
459
460 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL);
461 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
462 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);
463
464 dnode_special_open(os, &os->os_phys->os_meta_dnode,
465 DMU_META_DNODE_OBJECT, &os->os_meta_dnode);
466 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
467 dnode_special_open(os, &os->os_phys->os_userused_dnode,
468 DMU_USERUSED_OBJECT, &os->os_userused_dnode);
469 dnode_special_open(os, &os->os_phys->os_groupused_dnode,
470 DMU_GROUPUSED_OBJECT, &os->os_groupused_dnode);
471 }
472
473 *osp = os;
474 return (0);
475 }
476
477 int
dmu_objset_from_ds(dsl_dataset_t * ds,objset_t ** osp)478 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
479 {
480 int err = 0;
481
482 /*
483 * We shouldn't be doing anything with dsl_dataset_t's unless the
484 * pool_config lock is held, or the dataset is long-held.
485 */
486 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool) ||
487 dsl_dataset_long_held(ds));
488
489 mutex_enter(&ds->ds_opening_lock);
490 if (ds->ds_objset == NULL) {
491 objset_t *os;
492 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
493 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
494 ds, dsl_dataset_get_blkptr(ds), &os);
495 rrw_exit(&ds->ds_bp_rwlock, FTAG);
496
497 if (err == 0) {
498 mutex_enter(&ds->ds_lock);
499 ASSERT(ds->ds_objset == NULL);
500 ds->ds_objset = os;
501 mutex_exit(&ds->ds_lock);
502 }
503 }
504 *osp = ds->ds_objset;
505 mutex_exit(&ds->ds_opening_lock);
506 return (err);
507 }
508
509 /*
510 * Holds the pool while the objset is held. Therefore only one objset
511 * can be held at a time.
512 */
513 int
dmu_objset_hold(const char * name,void * tag,objset_t ** osp)514 dmu_objset_hold(const char *name, void *tag, objset_t **osp)
515 {
516 dsl_pool_t *dp;
517 dsl_dataset_t *ds;
518 int err;
519
520 err = dsl_pool_hold(name, tag, &dp);
521 if (err != 0)
522 return (err);
523 err = dsl_dataset_hold(dp, name, tag, &ds);
524 if (err != 0) {
525 dsl_pool_rele(dp, tag);
526 return (err);
527 }
528
529 err = dmu_objset_from_ds(ds, osp);
530 if (err != 0) {
531 dsl_dataset_rele(ds, tag);
532 dsl_pool_rele(dp, tag);
533 }
534
535 return (err);
536 }
537
538 static int
dmu_objset_own_impl(dsl_dataset_t * ds,dmu_objset_type_t type,boolean_t readonly,void * tag,objset_t ** osp)539 dmu_objset_own_impl(dsl_dataset_t *ds, dmu_objset_type_t type,
540 boolean_t readonly, void *tag, objset_t **osp)
541 {
542 int err;
543
544 err = dmu_objset_from_ds(ds, osp);
545 if (err != 0) {
546 dsl_dataset_disown(ds, tag);
547 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) {
548 dsl_dataset_disown(ds, tag);
549 return (SET_ERROR(EINVAL));
550 } else if (!readonly && dsl_dataset_is_snapshot(ds)) {
551 dsl_dataset_disown(ds, tag);
552 return (SET_ERROR(EROFS));
553 }
554 return (err);
555 }
556
557 /*
558 * dsl_pool must not be held when this is called.
559 * Upon successful return, there will be a longhold on the dataset,
560 * and the dsl_pool will not be held.
561 */
562 int
dmu_objset_own(const char * name,dmu_objset_type_t type,boolean_t readonly,void * tag,objset_t ** osp)563 dmu_objset_own(const char *name, dmu_objset_type_t type,
564 boolean_t readonly, void *tag, objset_t **osp)
565 {
566 dsl_pool_t *dp;
567 dsl_dataset_t *ds;
568 int err;
569
570 err = dsl_pool_hold(name, FTAG, &dp);
571 if (err != 0)
572 return (err);
573 err = dsl_dataset_own(dp, name, tag, &ds);
574 if (err != 0) {
575 dsl_pool_rele(dp, FTAG);
576 return (err);
577 }
578 err = dmu_objset_own_impl(ds, type, readonly, tag, osp);
579 dsl_pool_rele(dp, FTAG);
580
581 return (err);
582 }
583
584 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)585 dmu_objset_own_obj(dsl_pool_t *dp, uint64_t obj, dmu_objset_type_t type,
586 boolean_t readonly, void *tag, objset_t **osp)
587 {
588 dsl_dataset_t *ds;
589 int err;
590
591 err = dsl_dataset_own_obj(dp, obj, tag, &ds);
592 if (err != 0)
593 return (err);
594
595 return (dmu_objset_own_impl(ds, type, readonly, tag, osp));
596 }
597
598 void
dmu_objset_rele(objset_t * os,void * tag)599 dmu_objset_rele(objset_t *os, void *tag)
600 {
601 dsl_pool_t *dp = dmu_objset_pool(os);
602 dsl_dataset_rele(os->os_dsl_dataset, tag);
603 dsl_pool_rele(dp, tag);
604 }
605
606 /*
607 * When we are called, os MUST refer to an objset associated with a dataset
608 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner
609 * == tag. We will then release and reacquire ownership of the dataset while
610 * holding the pool config_rwlock to avoid intervening namespace or ownership
611 * changes may occur.
612 *
613 * This exists solely to accommodate zfs_ioc_userspace_upgrade()'s desire to
614 * release the hold on its dataset and acquire a new one on the dataset of the
615 * same name so that it can be partially torn down and reconstructed.
616 */
617 void
dmu_objset_refresh_ownership(objset_t * os,void * tag)618 dmu_objset_refresh_ownership(objset_t *os, void *tag)
619 {
620 dsl_pool_t *dp;
621 dsl_dataset_t *ds, *newds;
622 char name[ZFS_MAX_DATASET_NAME_LEN];
623
624 ds = os->os_dsl_dataset;
625 VERIFY3P(ds, !=, NULL);
626 VERIFY3P(ds->ds_owner, ==, tag);
627 VERIFY(dsl_dataset_long_held(ds));
628
629 dsl_dataset_name(ds, name);
630 dp = dmu_objset_pool(os);
631 dsl_pool_config_enter(dp, FTAG);
632 dmu_objset_disown(os, tag);
633 VERIFY0(dsl_dataset_own(dp, name, tag, &newds));
634 VERIFY3P(newds, ==, os->os_dsl_dataset);
635 dsl_pool_config_exit(dp, FTAG);
636 }
637
638 void
dmu_objset_disown(objset_t * os,void * tag)639 dmu_objset_disown(objset_t *os, void *tag)
640 {
641 dsl_dataset_disown(os->os_dsl_dataset, tag);
642 }
643
644 void
dmu_objset_evict_dbufs(objset_t * os)645 dmu_objset_evict_dbufs(objset_t *os)
646 {
647 dnode_t dn_marker;
648 dnode_t *dn;
649
650 mutex_enter(&os->os_lock);
651 dn = list_head(&os->os_dnodes);
652 while (dn != NULL) {
653 /*
654 * Skip dnodes without holds. We have to do this dance
655 * because dnode_add_ref() only works if there is already a
656 * hold. If the dnode has no holds, then it has no dbufs.
657 */
658 if (dnode_add_ref(dn, FTAG)) {
659 list_insert_after(&os->os_dnodes, dn, &dn_marker);
660 mutex_exit(&os->os_lock);
661
662 dnode_evict_dbufs(dn);
663 dnode_rele(dn, FTAG);
664
665 mutex_enter(&os->os_lock);
666 dn = list_next(&os->os_dnodes, &dn_marker);
667 list_remove(&os->os_dnodes, &dn_marker);
668 } else {
669 dn = list_next(&os->os_dnodes, dn);
670 }
671 }
672 mutex_exit(&os->os_lock);
673
674 if (DMU_USERUSED_DNODE(os) != NULL) {
675 dnode_evict_dbufs(DMU_GROUPUSED_DNODE(os));
676 dnode_evict_dbufs(DMU_USERUSED_DNODE(os));
677 }
678 dnode_evict_dbufs(DMU_META_DNODE(os));
679 }
680
681 /*
682 * Objset eviction processing is split into into two pieces.
683 * The first marks the objset as evicting, evicts any dbufs that
684 * have a refcount of zero, and then queues up the objset for the
685 * second phase of eviction. Once os->os_dnodes has been cleared by
686 * dnode_buf_pageout()->dnode_destroy(), the second phase is executed.
687 * The second phase closes the special dnodes, dequeues the objset from
688 * the list of those undergoing eviction, and finally frees the objset.
689 *
690 * NOTE: Due to asynchronous eviction processing (invocation of
691 * dnode_buf_pageout()), it is possible for the meta dnode for the
692 * objset to have no holds even though os->os_dnodes is not empty.
693 */
694 void
dmu_objset_evict(objset_t * os)695 dmu_objset_evict(objset_t *os)
696 {
697 dsl_dataset_t *ds = os->os_dsl_dataset;
698
699 for (int t = 0; t < TXG_SIZE; t++)
700 ASSERT(!dmu_objset_is_dirty(os, t));
701
702 if (ds)
703 dsl_prop_unregister_all(ds, os);
704
705 if (os->os_sa)
706 sa_tear_down(os);
707
708 dmu_objset_evict_dbufs(os);
709
710 mutex_enter(&os->os_lock);
711 spa_evicting_os_register(os->os_spa, os);
712 if (list_is_empty(&os->os_dnodes)) {
713 mutex_exit(&os->os_lock);
714 dmu_objset_evict_done(os);
715 } else {
716 mutex_exit(&os->os_lock);
717 }
718 }
719
720 void
dmu_objset_evict_done(objset_t * os)721 dmu_objset_evict_done(objset_t *os)
722 {
723 ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
724
725 dnode_special_close(&os->os_meta_dnode);
726 if (DMU_USERUSED_DNODE(os)) {
727 dnode_special_close(&os->os_userused_dnode);
728 dnode_special_close(&os->os_groupused_dnode);
729 }
730 zil_free(os->os_zil);
731
732 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf);
733
734 /*
735 * This is a barrier to prevent the objset from going away in
736 * dnode_move() until we can safely ensure that the objset is still in
737 * use. We consider the objset valid before the barrier and invalid
738 * after the barrier.
739 */
740 rw_enter(&os_lock, RW_READER);
741 rw_exit(&os_lock);
742
743 mutex_destroy(&os->os_lock);
744 mutex_destroy(&os->os_obj_lock);
745 mutex_destroy(&os->os_user_ptr_lock);
746 spa_evicting_os_deregister(os->os_spa, os);
747 kmem_free(os, sizeof (objset_t));
748 }
749
750 timestruc_t
dmu_objset_snap_cmtime(objset_t * os)751 dmu_objset_snap_cmtime(objset_t *os)
752 {
753 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
754 }
755
756 /* called from dsl for meta-objset */
757 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)758 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
759 dmu_objset_type_t type, dmu_tx_t *tx)
760 {
761 objset_t *os;
762 dnode_t *mdn;
763
764 ASSERT(dmu_tx_is_syncing(tx));
765
766 if (ds != NULL)
767 VERIFY0(dmu_objset_from_ds(ds, &os));
768 else
769 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os));
770
771 mdn = DMU_META_DNODE(os);
772
773 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT,
774 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx);
775
776 /*
777 * We don't want to have to increase the meta-dnode's nlevels
778 * later, because then we could do it in quescing context while
779 * we are also accessing it in open context.
780 *
781 * This precaution is not necessary for the MOS (ds == NULL),
782 * because the MOS is only updated in syncing context.
783 * This is most fortunate: the MOS is the only objset that
784 * needs to be synced multiple times as spa_sync() iterates
785 * to convergence, so minimizing its dn_nlevels matters.
786 */
787 if (ds != NULL) {
788 int levels = 1;
789
790 /*
791 * Determine the number of levels necessary for the meta-dnode
792 * to contain DN_MAX_OBJECT dnodes. Note that in order to
793 * ensure that we do not overflow 64 bits, there has to be
794 * a nlevels that gives us a number of blocks > DN_MAX_OBJECT
795 * but < 2^64. Therefore,
796 * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT) (10) must be
797 * less than (64 - log2(DN_MAX_OBJECT)) (16).
798 */
799 while ((uint64_t)mdn->dn_nblkptr <<
800 (mdn->dn_datablkshift - DNODE_SHIFT +
801 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) <
802 DN_MAX_OBJECT)
803 levels++;
804
805 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] =
806 mdn->dn_nlevels = levels;
807 }
808
809 ASSERT(type != DMU_OST_NONE);
810 ASSERT(type != DMU_OST_ANY);
811 ASSERT(type < DMU_OST_NUMTYPES);
812 os->os_phys->os_type = type;
813 if (dmu_objset_userused_enabled(os)) {
814 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
815 os->os_flags = os->os_phys->os_flags;
816 }
817
818 dsl_dataset_dirty(ds, tx);
819
820 return (os);
821 }
822
823 typedef struct dmu_objset_create_arg {
824 const char *doca_name;
825 cred_t *doca_cred;
826 void (*doca_userfunc)(objset_t *os, void *arg,
827 cred_t *cr, dmu_tx_t *tx);
828 void *doca_userarg;
829 dmu_objset_type_t doca_type;
830 uint64_t doca_flags;
831 } dmu_objset_create_arg_t;
832
833 /*ARGSUSED*/
834 static int
dmu_objset_create_check(void * arg,dmu_tx_t * tx)835 dmu_objset_create_check(void *arg, dmu_tx_t *tx)
836 {
837 dmu_objset_create_arg_t *doca = arg;
838 dsl_pool_t *dp = dmu_tx_pool(tx);
839 dsl_dir_t *pdd;
840 const char *tail;
841 int error;
842
843 if (strchr(doca->doca_name, '@') != NULL)
844 return (SET_ERROR(EINVAL));
845
846 if (strlen(doca->doca_name) >= ZFS_MAX_DATASET_NAME_LEN)
847 return (SET_ERROR(ENAMETOOLONG));
848
849 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail);
850 if (error != 0)
851 return (error);
852 if (tail == NULL) {
853 dsl_dir_rele(pdd, FTAG);
854 return (SET_ERROR(EEXIST));
855 }
856 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL,
857 doca->doca_cred);
858 dsl_dir_rele(pdd, FTAG);
859
860 return (error);
861 }
862
863 static void
dmu_objset_create_sync(void * arg,dmu_tx_t * tx)864 dmu_objset_create_sync(void *arg, dmu_tx_t *tx)
865 {
866 dmu_objset_create_arg_t *doca = arg;
867 dsl_pool_t *dp = dmu_tx_pool(tx);
868 dsl_dir_t *pdd;
869 const char *tail;
870 dsl_dataset_t *ds;
871 uint64_t obj;
872 blkptr_t *bp;
873 objset_t *os;
874
875 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail));
876
877 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags,
878 doca->doca_cred, tx);
879
880 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds));
881 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
882 bp = dsl_dataset_get_blkptr(ds);
883 os = dmu_objset_create_impl(pdd->dd_pool->dp_spa,
884 ds, bp, doca->doca_type, tx);
885 rrw_exit(&ds->ds_bp_rwlock, FTAG);
886
887 if (doca->doca_userfunc != NULL) {
888 doca->doca_userfunc(os, doca->doca_userarg,
889 doca->doca_cred, tx);
890 }
891
892 spa_history_log_internal_ds(ds, "create", tx, "");
893 dsl_dataset_rele(ds, FTAG);
894 dsl_dir_rele(pdd, FTAG);
895 }
896
897 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)898 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
899 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg)
900 {
901 dmu_objset_create_arg_t doca;
902
903 doca.doca_name = name;
904 doca.doca_cred = CRED();
905 doca.doca_flags = flags;
906 doca.doca_userfunc = func;
907 doca.doca_userarg = arg;
908 doca.doca_type = type;
909
910 return (dsl_sync_task(name,
911 dmu_objset_create_check, dmu_objset_create_sync, &doca,
912 5, ZFS_SPACE_CHECK_NORMAL));
913 }
914
915 typedef struct dmu_objset_clone_arg {
916 const char *doca_clone;
917 const char *doca_origin;
918 cred_t *doca_cred;
919 } dmu_objset_clone_arg_t;
920
921 /*ARGSUSED*/
922 static int
dmu_objset_clone_check(void * arg,dmu_tx_t * tx)923 dmu_objset_clone_check(void *arg, dmu_tx_t *tx)
924 {
925 dmu_objset_clone_arg_t *doca = arg;
926 dsl_dir_t *pdd;
927 const char *tail;
928 int error;
929 dsl_dataset_t *origin;
930 dsl_pool_t *dp = dmu_tx_pool(tx);
931
932 if (strchr(doca->doca_clone, '@') != NULL)
933 return (SET_ERROR(EINVAL));
934
935 if (strlen(doca->doca_clone) >= ZFS_MAX_DATASET_NAME_LEN)
936 return (SET_ERROR(ENAMETOOLONG));
937
938 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail);
939 if (error != 0)
940 return (error);
941 if (tail == NULL) {
942 dsl_dir_rele(pdd, FTAG);
943 return (SET_ERROR(EEXIST));
944 }
945
946 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL,
947 doca->doca_cred);
948 if (error != 0) {
949 dsl_dir_rele(pdd, FTAG);
950 return (SET_ERROR(EDQUOT));
951 }
952 dsl_dir_rele(pdd, FTAG);
953
954 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin);
955 if (error != 0)
956 return (error);
957
958 /* You can only clone snapshots, not the head datasets. */
959 if (!origin->ds_is_snapshot) {
960 dsl_dataset_rele(origin, FTAG);
961 return (SET_ERROR(EINVAL));
962 }
963 dsl_dataset_rele(origin, FTAG);
964
965 return (0);
966 }
967
968 static void
dmu_objset_clone_sync(void * arg,dmu_tx_t * tx)969 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx)
970 {
971 dmu_objset_clone_arg_t *doca = arg;
972 dsl_pool_t *dp = dmu_tx_pool(tx);
973 dsl_dir_t *pdd;
974 const char *tail;
975 dsl_dataset_t *origin, *ds;
976 uint64_t obj;
977 char namebuf[ZFS_MAX_DATASET_NAME_LEN];
978
979 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail));
980 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin));
981
982 obj = dsl_dataset_create_sync(pdd, tail, origin, 0,
983 doca->doca_cred, tx);
984
985 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds));
986 dsl_dataset_name(origin, namebuf);
987 spa_history_log_internal_ds(ds, "clone", tx,
988 "origin=%s (%llu)", namebuf, origin->ds_object);
989 dsl_dataset_rele(ds, FTAG);
990 dsl_dataset_rele(origin, FTAG);
991 dsl_dir_rele(pdd, FTAG);
992 }
993
994 int
dmu_objset_clone(const char * clone,const char * origin)995 dmu_objset_clone(const char *clone, const char *origin)
996 {
997 dmu_objset_clone_arg_t doca;
998
999 doca.doca_clone = clone;
1000 doca.doca_origin = origin;
1001 doca.doca_cred = CRED();
1002
1003 return (dsl_sync_task(clone,
1004 dmu_objset_clone_check, dmu_objset_clone_sync, &doca,
1005 5, ZFS_SPACE_CHECK_NORMAL));
1006 }
1007
1008 int
dmu_objset_snapshot_one(const char * fsname,const char * snapname)1009 dmu_objset_snapshot_one(const char *fsname, const char *snapname)
1010 {
1011 int err;
1012 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname);
1013 nvlist_t *snaps = fnvlist_alloc();
1014
1015 fnvlist_add_boolean(snaps, longsnap);
1016 strfree(longsnap);
1017 err = dsl_dataset_snapshot(snaps, NULL, NULL);
1018 fnvlist_free(snaps);
1019 return (err);
1020 }
1021
1022 static void
dmu_objset_sync_dnodes(list_t * list,list_t * newlist,dmu_tx_t * tx)1023 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx)
1024 {
1025 dnode_t *dn;
1026
1027 while (dn = list_head(list)) {
1028 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
1029 ASSERT(dn->dn_dbuf->db_data_pending);
1030 /*
1031 * Initialize dn_zio outside dnode_sync() because the
1032 * meta-dnode needs to set it ouside dnode_sync().
1033 */
1034 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio;
1035 ASSERT(dn->dn_zio);
1036
1037 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS);
1038 list_remove(list, dn);
1039
1040 if (newlist) {
1041 (void) dnode_add_ref(dn, newlist);
1042 list_insert_tail(newlist, dn);
1043 }
1044
1045 dnode_sync(dn, tx);
1046 }
1047 }
1048
1049 /* ARGSUSED */
1050 static void
dmu_objset_write_ready(zio_t * zio,arc_buf_t * abuf,void * arg)1051 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg)
1052 {
1053 blkptr_t *bp = zio->io_bp;
1054 objset_t *os = arg;
1055 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode;
1056
1057 ASSERT(!BP_IS_EMBEDDED(bp));
1058 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET);
1059 ASSERT0(BP_GET_LEVEL(bp));
1060
1061 /*
1062 * Update rootbp fill count: it should be the number of objects
1063 * allocated in the object set (not counting the "special"
1064 * objects that are stored in the objset_phys_t -- the meta
1065 * dnode and user/group accounting objects).
1066 */
1067 bp->blk_fill = 0;
1068 for (int i = 0; i < dnp->dn_nblkptr; i++)
1069 bp->blk_fill += BP_GET_FILL(&dnp->dn_blkptr[i]);
1070 if (os->os_dsl_dataset != NULL)
1071 rrw_enter(&os->os_dsl_dataset->ds_bp_rwlock, RW_WRITER, FTAG);
1072 *os->os_rootbp = *bp;
1073 if (os->os_dsl_dataset != NULL)
1074 rrw_exit(&os->os_dsl_dataset->ds_bp_rwlock, FTAG);
1075 }
1076
1077 /* ARGSUSED */
1078 static void
dmu_objset_write_done(zio_t * zio,arc_buf_t * abuf,void * arg)1079 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg)
1080 {
1081 blkptr_t *bp = zio->io_bp;
1082 blkptr_t *bp_orig = &zio->io_bp_orig;
1083 objset_t *os = arg;
1084
1085 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
1086 ASSERT(BP_EQUAL(bp, bp_orig));
1087 } else {
1088 dsl_dataset_t *ds = os->os_dsl_dataset;
1089 dmu_tx_t *tx = os->os_synctx;
1090
1091 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
1092 dsl_dataset_block_born(ds, bp, tx);
1093 }
1094 kmem_free(bp, sizeof (*bp));
1095 }
1096
1097 /* called from dsl */
1098 void
dmu_objset_sync(objset_t * os,zio_t * pio,dmu_tx_t * tx)1099 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
1100 {
1101 int txgoff;
1102 zbookmark_phys_t zb;
1103 zio_prop_t zp;
1104 zio_t *zio;
1105 list_t *list;
1106 list_t *newlist = NULL;
1107 dbuf_dirty_record_t *dr;
1108 blkptr_t *blkptr_copy = kmem_alloc(sizeof (*os->os_rootbp), KM_SLEEP);
1109 *blkptr_copy = *os->os_rootbp;
1110
1111 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);
1112
1113 ASSERT(dmu_tx_is_syncing(tx));
1114 /* XXX the write_done callback should really give us the tx... */
1115 os->os_synctx = tx;
1116
1117 if (os->os_dsl_dataset == NULL) {
1118 /*
1119 * This is the MOS. If we have upgraded,
1120 * spa_max_replication() could change, so reset
1121 * os_copies here.
1122 */
1123 os->os_copies = spa_max_replication(os->os_spa);
1124 }
1125
1126 /*
1127 * Create the root block IO
1128 */
1129 SET_BOOKMARK(&zb, os->os_dsl_dataset ?
1130 os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
1131 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
1132 arc_release(os->os_phys_buf, &os->os_phys_buf);
1133
1134 dmu_write_policy(os, NULL, 0, 0, &zp);
1135
1136 zio = arc_write(pio, os->os_spa, tx->tx_txg,
1137 blkptr_copy, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os),
1138 &zp, dmu_objset_write_ready, NULL, NULL, dmu_objset_write_done,
1139 os, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);
1140
1141 /*
1142 * Sync special dnodes - the parent IO for the sync is the root block
1143 */
1144 DMU_META_DNODE(os)->dn_zio = zio;
1145 dnode_sync(DMU_META_DNODE(os), tx);
1146
1147 os->os_phys->os_flags = os->os_flags;
1148
1149 if (DMU_USERUSED_DNODE(os) &&
1150 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) {
1151 DMU_USERUSED_DNODE(os)->dn_zio = zio;
1152 dnode_sync(DMU_USERUSED_DNODE(os), tx);
1153 DMU_GROUPUSED_DNODE(os)->dn_zio = zio;
1154 dnode_sync(DMU_GROUPUSED_DNODE(os), tx);
1155 }
1156
1157 txgoff = tx->tx_txg & TXG_MASK;
1158
1159 if (dmu_objset_userused_enabled(os)) {
1160 newlist = &os->os_synced_dnodes;
1161 /*
1162 * We must create the list here because it uses the
1163 * dn_dirty_link[] of this txg.
1164 */
1165 list_create(newlist, sizeof (dnode_t),
1166 offsetof(dnode_t, dn_dirty_link[txgoff]));
1167 }
1168
1169 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx);
1170 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx);
1171
1172 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff];
1173 while (dr = list_head(list)) {
1174 ASSERT0(dr->dr_dbuf->db_level);
1175 list_remove(list, dr);
1176 if (dr->dr_zio)
1177 zio_nowait(dr->dr_zio);
1178 }
1179 /*
1180 * Free intent log blocks up to this tx.
1181 */
1182 zil_sync(os->os_zil, tx);
1183 os->os_phys->os_zil_header = os->os_zil_header;
1184 zio_nowait(zio);
1185 }
1186
1187 boolean_t
dmu_objset_is_dirty(objset_t * os,uint64_t txg)1188 dmu_objset_is_dirty(objset_t *os, uint64_t txg)
1189 {
1190 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) ||
1191 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK]));
1192 }
1193
1194 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES];
1195
1196 void
dmu_objset_register_type(dmu_objset_type_t ost,objset_used_cb_t * cb)1197 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb)
1198 {
1199 used_cbs[ost] = cb;
1200 }
1201
1202 boolean_t
dmu_objset_userused_enabled(objset_t * os)1203 dmu_objset_userused_enabled(objset_t *os)
1204 {
1205 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE &&
1206 used_cbs[os->os_phys->os_type] != NULL &&
1207 DMU_USERUSED_DNODE(os) != NULL);
1208 }
1209
1210 typedef struct userquota_node {
1211 uint64_t uqn_id;
1212 int64_t uqn_delta;
1213 avl_node_t uqn_node;
1214 } userquota_node_t;
1215
1216 typedef struct userquota_cache {
1217 avl_tree_t uqc_user_deltas;
1218 avl_tree_t uqc_group_deltas;
1219 } userquota_cache_t;
1220
1221 static int
userquota_compare(const void * l,const void * r)1222 userquota_compare(const void *l, const void *r)
1223 {
1224 const userquota_node_t *luqn = l;
1225 const userquota_node_t *ruqn = r;
1226
1227 if (luqn->uqn_id < ruqn->uqn_id)
1228 return (-1);
1229 if (luqn->uqn_id > ruqn->uqn_id)
1230 return (1);
1231 return (0);
1232 }
1233
1234 static void
do_userquota_cacheflush(objset_t * os,userquota_cache_t * cache,dmu_tx_t * tx)1235 do_userquota_cacheflush(objset_t *os, userquota_cache_t *cache, dmu_tx_t *tx)
1236 {
1237 void *cookie;
1238 userquota_node_t *uqn;
1239
1240 ASSERT(dmu_tx_is_syncing(tx));
1241
1242 cookie = NULL;
1243 while ((uqn = avl_destroy_nodes(&cache->uqc_user_deltas,
1244 &cookie)) != NULL) {
1245 VERIFY0(zap_increment_int(os, DMU_USERUSED_OBJECT,
1246 uqn->uqn_id, uqn->uqn_delta, tx));
1247 kmem_free(uqn, sizeof (*uqn));
1248 }
1249 avl_destroy(&cache->uqc_user_deltas);
1250
1251 cookie = NULL;
1252 while ((uqn = avl_destroy_nodes(&cache->uqc_group_deltas,
1253 &cookie)) != NULL) {
1254 VERIFY0(zap_increment_int(os, DMU_GROUPUSED_OBJECT,
1255 uqn->uqn_id, uqn->uqn_delta, tx));
1256 kmem_free(uqn, sizeof (*uqn));
1257 }
1258 avl_destroy(&cache->uqc_group_deltas);
1259 }
1260
1261 static void
userquota_update_cache(avl_tree_t * avl,uint64_t id,int64_t delta)1262 userquota_update_cache(avl_tree_t *avl, uint64_t id, int64_t delta)
1263 {
1264 userquota_node_t search = { .uqn_id = id };
1265 avl_index_t idx;
1266
1267 userquota_node_t *uqn = avl_find(avl, &search, &idx);
1268 if (uqn == NULL) {
1269 uqn = kmem_zalloc(sizeof (*uqn), KM_SLEEP);
1270 uqn->uqn_id = id;
1271 avl_insert(avl, uqn, idx);
1272 }
1273 uqn->uqn_delta += delta;
1274 }
1275
1276 static void
do_userquota_update(userquota_cache_t * cache,uint64_t used,uint64_t flags,uint64_t user,uint64_t group,boolean_t subtract)1277 do_userquota_update(userquota_cache_t *cache, uint64_t used, uint64_t flags,
1278 uint64_t user, uint64_t group, boolean_t subtract)
1279 {
1280 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) {
1281 int64_t delta = DNODE_SIZE + used;
1282 if (subtract)
1283 delta = -delta;
1284
1285 userquota_update_cache(&cache->uqc_user_deltas, user, delta);
1286 userquota_update_cache(&cache->uqc_group_deltas, group, delta);
1287 }
1288 }
1289
1290 void
dmu_objset_do_userquota_updates(objset_t * os,dmu_tx_t * tx)1291 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx)
1292 {
1293 dnode_t *dn;
1294 list_t *list = &os->os_synced_dnodes;
1295 userquota_cache_t cache = { 0 };
1296
1297 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
1298
1299 avl_create(&cache.uqc_user_deltas, userquota_compare,
1300 sizeof (userquota_node_t), offsetof(userquota_node_t, uqn_node));
1301 avl_create(&cache.uqc_group_deltas, userquota_compare,
1302 sizeof (userquota_node_t), offsetof(userquota_node_t, uqn_node));
1303
1304 while (dn = list_head(list)) {
1305 int flags;
1306 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object));
1307 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE ||
1308 dn->dn_phys->dn_flags &
1309 DNODE_FLAG_USERUSED_ACCOUNTED);
1310
1311 /* Allocate the user/groupused objects if necessary. */
1312 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) {
1313 VERIFY0(zap_create_claim(os,
1314 DMU_USERUSED_OBJECT,
1315 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1316 VERIFY0(zap_create_claim(os,
1317 DMU_GROUPUSED_OBJECT,
1318 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1319 }
1320
1321 flags = dn->dn_id_flags;
1322 ASSERT(flags);
1323 if (flags & DN_ID_OLD_EXIST) {
1324 do_userquota_update(&cache,
1325 dn->dn_oldused, dn->dn_oldflags,
1326 dn->dn_olduid, dn->dn_oldgid, B_TRUE);
1327 }
1328 if (flags & DN_ID_NEW_EXIST) {
1329 do_userquota_update(&cache,
1330 DN_USED_BYTES(dn->dn_phys),
1331 dn->dn_phys->dn_flags, dn->dn_newuid,
1332 dn->dn_newgid, B_FALSE);
1333 }
1334
1335 mutex_enter(&dn->dn_mtx);
1336 dn->dn_oldused = 0;
1337 dn->dn_oldflags = 0;
1338 if (dn->dn_id_flags & DN_ID_NEW_EXIST) {
1339 dn->dn_olduid = dn->dn_newuid;
1340 dn->dn_oldgid = dn->dn_newgid;
1341 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1342 if (dn->dn_bonuslen == 0)
1343 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1344 else
1345 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1346 }
1347 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST);
1348 mutex_exit(&dn->dn_mtx);
1349
1350 list_remove(list, dn);
1351 dnode_rele(dn, list);
1352 }
1353 do_userquota_cacheflush(os, &cache, tx);
1354 }
1355
1356 /*
1357 * Returns a pointer to data to find uid/gid from
1358 *
1359 * If a dirty record for transaction group that is syncing can't
1360 * be found then NULL is returned. In the NULL case it is assumed
1361 * the uid/gid aren't changing.
1362 */
1363 static void *
dmu_objset_userquota_find_data(dmu_buf_impl_t * db,dmu_tx_t * tx)1364 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx)
1365 {
1366 dbuf_dirty_record_t *dr, **drp;
1367 void *data;
1368
1369 if (db->db_dirtycnt == 0)
1370 return (db->db.db_data); /* Nothing is changing */
1371
1372 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next)
1373 if (dr->dr_txg == tx->tx_txg)
1374 break;
1375
1376 if (dr == NULL) {
1377 data = NULL;
1378 } else {
1379 dnode_t *dn;
1380
1381 DB_DNODE_ENTER(dr->dr_dbuf);
1382 dn = DB_DNODE(dr->dr_dbuf);
1383
1384 if (dn->dn_bonuslen == 0 &&
1385 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID)
1386 data = dr->dt.dl.dr_data->b_data;
1387 else
1388 data = dr->dt.dl.dr_data;
1389
1390 DB_DNODE_EXIT(dr->dr_dbuf);
1391 }
1392
1393 return (data);
1394 }
1395
1396 void
dmu_objset_userquota_get_ids(dnode_t * dn,boolean_t before,dmu_tx_t * tx)1397 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx)
1398 {
1399 objset_t *os = dn->dn_objset;
1400 void *data = NULL;
1401 dmu_buf_impl_t *db = NULL;
1402 uint64_t *user = NULL;
1403 uint64_t *group = NULL;
1404 int flags = dn->dn_id_flags;
1405 int error;
1406 boolean_t have_spill = B_FALSE;
1407
1408 if (!dmu_objset_userused_enabled(dn->dn_objset))
1409 return;
1410
1411 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST|
1412 DN_ID_CHKED_SPILL)))
1413 return;
1414
1415 if (before && dn->dn_bonuslen != 0)
1416 data = DN_BONUS(dn->dn_phys);
1417 else if (!before && dn->dn_bonuslen != 0) {
1418 if (dn->dn_bonus) {
1419 db = dn->dn_bonus;
1420 mutex_enter(&db->db_mtx);
1421 data = dmu_objset_userquota_find_data(db, tx);
1422 } else {
1423 data = DN_BONUS(dn->dn_phys);
1424 }
1425 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) {
1426 int rf = 0;
1427
1428 if (RW_WRITE_HELD(&dn->dn_struct_rwlock))
1429 rf |= DB_RF_HAVESTRUCT;
1430 error = dmu_spill_hold_by_dnode(dn,
1431 rf | DB_RF_MUST_SUCCEED,
1432 FTAG, (dmu_buf_t **)&db);
1433 ASSERT(error == 0);
1434 mutex_enter(&db->db_mtx);
1435 data = (before) ? db->db.db_data :
1436 dmu_objset_userquota_find_data(db, tx);
1437 have_spill = B_TRUE;
1438 } else {
1439 mutex_enter(&dn->dn_mtx);
1440 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1441 mutex_exit(&dn->dn_mtx);
1442 return;
1443 }
1444
1445 if (before) {
1446 ASSERT(data);
1447 user = &dn->dn_olduid;
1448 group = &dn->dn_oldgid;
1449 } else if (data) {
1450 user = &dn->dn_newuid;
1451 group = &dn->dn_newgid;
1452 }
1453
1454 /*
1455 * Must always call the callback in case the object
1456 * type has changed and that type isn't an object type to track
1457 */
1458 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data,
1459 user, group);
1460
1461 /*
1462 * Preserve existing uid/gid when the callback can't determine
1463 * what the new uid/gid are and the callback returned EEXIST.
1464 * The EEXIST error tells us to just use the existing uid/gid.
1465 * If we don't know what the old values are then just assign
1466 * them to 0, since that is a new file being created.
1467 */
1468 if (!before && data == NULL && error == EEXIST) {
1469 if (flags & DN_ID_OLD_EXIST) {
1470 dn->dn_newuid = dn->dn_olduid;
1471 dn->dn_newgid = dn->dn_oldgid;
1472 } else {
1473 dn->dn_newuid = 0;
1474 dn->dn_newgid = 0;
1475 }
1476 error = 0;
1477 }
1478
1479 if (db)
1480 mutex_exit(&db->db_mtx);
1481
1482 mutex_enter(&dn->dn_mtx);
1483 if (error == 0 && before)
1484 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1485 if (error == 0 && !before)
1486 dn->dn_id_flags |= DN_ID_NEW_EXIST;
1487
1488 if (have_spill) {
1489 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1490 } else {
1491 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1492 }
1493 mutex_exit(&dn->dn_mtx);
1494 if (have_spill)
1495 dmu_buf_rele((dmu_buf_t *)db, FTAG);
1496 }
1497
1498 boolean_t
dmu_objset_userspace_present(objset_t * os)1499 dmu_objset_userspace_present(objset_t *os)
1500 {
1501 return (os->os_phys->os_flags &
1502 OBJSET_FLAG_USERACCOUNTING_COMPLETE);
1503 }
1504
1505 int
dmu_objset_userspace_upgrade(objset_t * os)1506 dmu_objset_userspace_upgrade(objset_t *os)
1507 {
1508 uint64_t obj;
1509 int err = 0;
1510
1511 if (dmu_objset_userspace_present(os))
1512 return (0);
1513 if (!dmu_objset_userused_enabled(os))
1514 return (SET_ERROR(ENOTSUP));
1515 if (dmu_objset_is_snapshot(os))
1516 return (SET_ERROR(EINVAL));
1517
1518 /*
1519 * We simply need to mark every object dirty, so that it will be
1520 * synced out and now accounted. If this is called
1521 * concurrently, or if we already did some work before crashing,
1522 * that's fine, since we track each object's accounted state
1523 * independently.
1524 */
1525
1526 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) {
1527 dmu_tx_t *tx;
1528 dmu_buf_t *db;
1529 int objerr;
1530
1531 if (issig(JUSTLOOKING) && issig(FORREAL))
1532 return (SET_ERROR(EINTR));
1533
1534 objerr = dmu_bonus_hold(os, obj, FTAG, &db);
1535 if (objerr != 0)
1536 continue;
1537 tx = dmu_tx_create(os);
1538 dmu_tx_hold_bonus(tx, obj);
1539 objerr = dmu_tx_assign(tx, TXG_WAIT);
1540 if (objerr != 0) {
1541 dmu_tx_abort(tx);
1542 continue;
1543 }
1544 dmu_buf_will_dirty(db, tx);
1545 dmu_buf_rele(db, FTAG);
1546 dmu_tx_commit(tx);
1547 }
1548
1549 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
1550 txg_wait_synced(dmu_objset_pool(os), 0);
1551 return (0);
1552 }
1553
1554 void
dmu_objset_space(objset_t * os,uint64_t * refdbytesp,uint64_t * availbytesp,uint64_t * usedobjsp,uint64_t * availobjsp)1555 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
1556 uint64_t *usedobjsp, uint64_t *availobjsp)
1557 {
1558 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp,
1559 usedobjsp, availobjsp);
1560 }
1561
1562 uint64_t
dmu_objset_fsid_guid(objset_t * os)1563 dmu_objset_fsid_guid(objset_t *os)
1564 {
1565 return (dsl_dataset_fsid_guid(os->os_dsl_dataset));
1566 }
1567
1568 void
dmu_objset_fast_stat(objset_t * os,dmu_objset_stats_t * stat)1569 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat)
1570 {
1571 stat->dds_type = os->os_phys->os_type;
1572 if (os->os_dsl_dataset)
1573 dsl_dataset_fast_stat(os->os_dsl_dataset, stat);
1574 }
1575
1576 void
dmu_objset_stats(objset_t * os,nvlist_t * nv)1577 dmu_objset_stats(objset_t *os, nvlist_t *nv)
1578 {
1579 ASSERT(os->os_dsl_dataset ||
1580 os->os_phys->os_type == DMU_OST_META);
1581
1582 if (os->os_dsl_dataset != NULL)
1583 dsl_dataset_stats(os->os_dsl_dataset, nv);
1584
1585 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
1586 os->os_phys->os_type);
1587 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING,
1588 dmu_objset_userspace_present(os));
1589 }
1590
1591 int
dmu_objset_is_snapshot(objset_t * os)1592 dmu_objset_is_snapshot(objset_t *os)
1593 {
1594 if (os->os_dsl_dataset != NULL)
1595 return (os->os_dsl_dataset->ds_is_snapshot);
1596 else
1597 return (B_FALSE);
1598 }
1599
1600 int
dmu_snapshot_realname(objset_t * os,char * name,char * real,int maxlen,boolean_t * conflict)1601 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
1602 boolean_t *conflict)
1603 {
1604 dsl_dataset_t *ds = os->os_dsl_dataset;
1605 uint64_t ignored;
1606
1607 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0)
1608 return (SET_ERROR(ENOENT));
1609
1610 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset,
1611 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored,
1612 MT_FIRST, real, maxlen, conflict));
1613 }
1614
1615 int
dmu_snapshot_list_next(objset_t * os,int namelen,char * name,uint64_t * idp,uint64_t * offp,boolean_t * case_conflict)1616 dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
1617 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict)
1618 {
1619 dsl_dataset_t *ds = os->os_dsl_dataset;
1620 zap_cursor_t cursor;
1621 zap_attribute_t attr;
1622
1623 ASSERT(dsl_pool_config_held(dmu_objset_pool(os)));
1624
1625 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0)
1626 return (SET_ERROR(ENOENT));
1627
1628 zap_cursor_init_serialized(&cursor,
1629 ds->ds_dir->dd_pool->dp_meta_objset,
1630 dsl_dataset_phys(ds)->ds_snapnames_zapobj, *offp);
1631
1632 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1633 zap_cursor_fini(&cursor);
1634 return (SET_ERROR(ENOENT));
1635 }
1636
1637 if (strlen(attr.za_name) + 1 > namelen) {
1638 zap_cursor_fini(&cursor);
1639 return (SET_ERROR(ENAMETOOLONG));
1640 }
1641
1642 (void) strcpy(name, attr.za_name);
1643 if (idp)
1644 *idp = attr.za_first_integer;
1645 if (case_conflict)
1646 *case_conflict = attr.za_normalization_conflict;
1647 zap_cursor_advance(&cursor);
1648 *offp = zap_cursor_serialize(&cursor);
1649 zap_cursor_fini(&cursor);
1650
1651 return (0);
1652 }
1653
1654 int
dmu_dir_list_next(objset_t * os,int namelen,char * name,uint64_t * idp,uint64_t * offp)1655 dmu_dir_list_next(objset_t *os, int namelen, char *name,
1656 uint64_t *idp, uint64_t *offp)
1657 {
1658 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir;
1659 zap_cursor_t cursor;
1660 zap_attribute_t attr;
1661
1662 /* there is no next dir on a snapshot! */
1663 if (os->os_dsl_dataset->ds_object !=
1664 dsl_dir_phys(dd)->dd_head_dataset_obj)
1665 return (SET_ERROR(ENOENT));
1666
1667 zap_cursor_init_serialized(&cursor,
1668 dd->dd_pool->dp_meta_objset,
1669 dsl_dir_phys(dd)->dd_child_dir_zapobj, *offp);
1670
1671 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1672 zap_cursor_fini(&cursor);
1673 return (SET_ERROR(ENOENT));
1674 }
1675
1676 if (strlen(attr.za_name) + 1 > namelen) {
1677 zap_cursor_fini(&cursor);
1678 return (SET_ERROR(ENAMETOOLONG));
1679 }
1680
1681 (void) strcpy(name, attr.za_name);
1682 if (idp)
1683 *idp = attr.za_first_integer;
1684 zap_cursor_advance(&cursor);
1685 *offp = zap_cursor_serialize(&cursor);
1686 zap_cursor_fini(&cursor);
1687
1688 return (0);
1689 }
1690
1691 typedef struct dmu_objset_find_ctx {
1692 taskq_t *dc_tq;
1693 dsl_pool_t *dc_dp;
1694 uint64_t dc_ddobj;
1695 int (*dc_func)(dsl_pool_t *, dsl_dataset_t *, void *);
1696 void *dc_arg;
1697 int dc_flags;
1698 kmutex_t *dc_error_lock;
1699 int *dc_error;
1700 } dmu_objset_find_ctx_t;
1701
1702 static void
dmu_objset_find_dp_impl(dmu_objset_find_ctx_t * dcp)1703 dmu_objset_find_dp_impl(dmu_objset_find_ctx_t *dcp)
1704 {
1705 dsl_pool_t *dp = dcp->dc_dp;
1706 dmu_objset_find_ctx_t *child_dcp;
1707 dsl_dir_t *dd;
1708 dsl_dataset_t *ds;
1709 zap_cursor_t zc;
1710 zap_attribute_t *attr;
1711 uint64_t thisobj;
1712 int err = 0;
1713
1714 /* don't process if there already was an error */
1715 if (*dcp->dc_error != 0)
1716 goto out;
1717
1718 err = dsl_dir_hold_obj(dp, dcp->dc_ddobj, NULL, FTAG, &dd);
1719 if (err != 0)
1720 goto out;
1721
1722 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1723 if (dd->dd_myname[0] == '$') {
1724 dsl_dir_rele(dd, FTAG);
1725 goto out;
1726 }
1727
1728 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj;
1729 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1730
1731 /*
1732 * Iterate over all children.
1733 */
1734 if (dcp->dc_flags & DS_FIND_CHILDREN) {
1735 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1736 dsl_dir_phys(dd)->dd_child_dir_zapobj);
1737 zap_cursor_retrieve(&zc, attr) == 0;
1738 (void) zap_cursor_advance(&zc)) {
1739 ASSERT3U(attr->za_integer_length, ==,
1740 sizeof (uint64_t));
1741 ASSERT3U(attr->za_num_integers, ==, 1);
1742
1743 child_dcp = kmem_alloc(sizeof (*child_dcp), KM_SLEEP);
1744 *child_dcp = *dcp;
1745 child_dcp->dc_ddobj = attr->za_first_integer;
1746 if (dcp->dc_tq != NULL)
1747 (void) taskq_dispatch(dcp->dc_tq,
1748 dmu_objset_find_dp_cb, child_dcp, TQ_SLEEP);
1749 else
1750 dmu_objset_find_dp_impl(child_dcp);
1751 }
1752 zap_cursor_fini(&zc);
1753 }
1754
1755 /*
1756 * Iterate over all snapshots.
1757 */
1758 if (dcp->dc_flags & DS_FIND_SNAPSHOTS) {
1759 dsl_dataset_t *ds;
1760 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1761
1762 if (err == 0) {
1763 uint64_t snapobj;
1764
1765 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
1766 dsl_dataset_rele(ds, FTAG);
1767
1768 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1769 zap_cursor_retrieve(&zc, attr) == 0;
1770 (void) zap_cursor_advance(&zc)) {
1771 ASSERT3U(attr->za_integer_length, ==,
1772 sizeof (uint64_t));
1773 ASSERT3U(attr->za_num_integers, ==, 1);
1774
1775 err = dsl_dataset_hold_obj(dp,
1776 attr->za_first_integer, FTAG, &ds);
1777 if (err != 0)
1778 break;
1779 err = dcp->dc_func(dp, ds, dcp->dc_arg);
1780 dsl_dataset_rele(ds, FTAG);
1781 if (err != 0)
1782 break;
1783 }
1784 zap_cursor_fini(&zc);
1785 }
1786 }
1787
1788 dsl_dir_rele(dd, FTAG);
1789 kmem_free(attr, sizeof (zap_attribute_t));
1790
1791 if (err != 0)
1792 goto out;
1793
1794 /*
1795 * Apply to self.
1796 */
1797 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1798 if (err != 0)
1799 goto out;
1800 err = dcp->dc_func(dp, ds, dcp->dc_arg);
1801 dsl_dataset_rele(ds, FTAG);
1802
1803 out:
1804 if (err != 0) {
1805 mutex_enter(dcp->dc_error_lock);
1806 /* only keep first error */
1807 if (*dcp->dc_error == 0)
1808 *dcp->dc_error = err;
1809 mutex_exit(dcp->dc_error_lock);
1810 }
1811
1812 kmem_free(dcp, sizeof (*dcp));
1813 }
1814
1815 static void
dmu_objset_find_dp_cb(void * arg)1816 dmu_objset_find_dp_cb(void *arg)
1817 {
1818 dmu_objset_find_ctx_t *dcp = arg;
1819 dsl_pool_t *dp = dcp->dc_dp;
1820
1821 /*
1822 * We need to get a pool_config_lock here, as there are several
1823 * asssert(pool_config_held) down the stack. Getting a lock via
1824 * dsl_pool_config_enter is risky, as it might be stalled by a
1825 * pending writer. This would deadlock, as the write lock can
1826 * only be granted when our parent thread gives up the lock.
1827 * The _prio interface gives us priority over a pending writer.
1828 */
1829 dsl_pool_config_enter_prio(dp, FTAG);
1830
1831 dmu_objset_find_dp_impl(dcp);
1832
1833 dsl_pool_config_exit(dp, FTAG);
1834 }
1835
1836 /*
1837 * Find objsets under and including ddobj, call func(ds) on each.
1838 * The order for the enumeration is completely undefined.
1839 * func is called with dsl_pool_config held.
1840 */
1841 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)1842 dmu_objset_find_dp(dsl_pool_t *dp, uint64_t ddobj,
1843 int func(dsl_pool_t *, dsl_dataset_t *, void *), void *arg, int flags)
1844 {
1845 int error = 0;
1846 taskq_t *tq = NULL;
1847 int ntasks;
1848 dmu_objset_find_ctx_t *dcp;
1849 kmutex_t err_lock;
1850
1851 mutex_init(&err_lock, NULL, MUTEX_DEFAULT, NULL);
1852 dcp = kmem_alloc(sizeof (*dcp), KM_SLEEP);
1853 dcp->dc_tq = NULL;
1854 dcp->dc_dp = dp;
1855 dcp->dc_ddobj = ddobj;
1856 dcp->dc_func = func;
1857 dcp->dc_arg = arg;
1858 dcp->dc_flags = flags;
1859 dcp->dc_error_lock = &err_lock;
1860 dcp->dc_error = &error;
1861
1862 if ((flags & DS_FIND_SERIALIZE) || dsl_pool_config_held_writer(dp)) {
1863 /*
1864 * In case a write lock is held we can't make use of
1865 * parallelism, as down the stack of the worker threads
1866 * the lock is asserted via dsl_pool_config_held.
1867 * In case of a read lock this is solved by getting a read
1868 * lock in each worker thread, which isn't possible in case
1869 * of a writer lock. So we fall back to the synchronous path
1870 * here.
1871 * In the future it might be possible to get some magic into
1872 * dsl_pool_config_held in a way that it returns true for
1873 * the worker threads so that a single lock held from this
1874 * thread suffices. For now, stay single threaded.
1875 */
1876 dmu_objset_find_dp_impl(dcp);
1877 mutex_destroy(&err_lock);
1878
1879 return (error);
1880 }
1881
1882 ntasks = dmu_find_threads;
1883 if (ntasks == 0)
1884 ntasks = vdev_count_leaves(dp->dp_spa) * 4;
1885 tq = taskq_create("dmu_objset_find", ntasks, minclsyspri, ntasks,
1886 INT_MAX, 0);
1887 if (tq == NULL) {
1888 kmem_free(dcp, sizeof (*dcp));
1889 mutex_destroy(&err_lock);
1890
1891 return (SET_ERROR(ENOMEM));
1892 }
1893 dcp->dc_tq = tq;
1894
1895 /* dcp will be freed by task */
1896 (void) taskq_dispatch(tq, dmu_objset_find_dp_cb, dcp, TQ_SLEEP);
1897
1898 /*
1899 * PORTING: this code relies on the property of taskq_wait to wait
1900 * until no more tasks are queued and no more tasks are active. As
1901 * we always queue new tasks from within other tasks, task_wait
1902 * reliably waits for the full recursion to finish, even though we
1903 * enqueue new tasks after taskq_wait has been called.
1904 * On platforms other than illumos, taskq_wait may not have this
1905 * property.
1906 */
1907 taskq_wait(tq);
1908 taskq_destroy(tq);
1909 mutex_destroy(&err_lock);
1910
1911 return (error);
1912 }
1913
1914 /*
1915 * Find all objsets under name, and for each, call 'func(child_name, arg)'.
1916 * The dp_config_rwlock must not be held when this is called, and it
1917 * will not be held when the callback is called.
1918 * Therefore this function should only be used when the pool is not changing
1919 * (e.g. in syncing context), or the callback can deal with the possible races.
1920 */
1921 static int
dmu_objset_find_impl(spa_t * spa,const char * name,int func (const char *,void *),void * arg,int flags)1922 dmu_objset_find_impl(spa_t *spa, const char *name,
1923 int func(const char *, void *), void *arg, int flags)
1924 {
1925 dsl_dir_t *dd;
1926 dsl_pool_t *dp = spa_get_dsl(spa);
1927 dsl_dataset_t *ds;
1928 zap_cursor_t zc;
1929 zap_attribute_t *attr;
1930 char *child;
1931 uint64_t thisobj;
1932 int err;
1933
1934 dsl_pool_config_enter(dp, FTAG);
1935
1936 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL);
1937 if (err != 0) {
1938 dsl_pool_config_exit(dp, FTAG);
1939 return (err);
1940 }
1941
1942 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1943 if (dd->dd_myname[0] == '$') {
1944 dsl_dir_rele(dd, FTAG);
1945 dsl_pool_config_exit(dp, FTAG);
1946 return (0);
1947 }
1948
1949 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj;
1950 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1951
1952 /*
1953 * Iterate over all children.
1954 */
1955 if (flags & DS_FIND_CHILDREN) {
1956 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1957 dsl_dir_phys(dd)->dd_child_dir_zapobj);
1958 zap_cursor_retrieve(&zc, attr) == 0;
1959 (void) zap_cursor_advance(&zc)) {
1960 ASSERT3U(attr->za_integer_length, ==,
1961 sizeof (uint64_t));
1962 ASSERT3U(attr->za_num_integers, ==, 1);
1963
1964 child = kmem_asprintf("%s/%s", name, attr->za_name);
1965 dsl_pool_config_exit(dp, FTAG);
1966 err = dmu_objset_find_impl(spa, child,
1967 func, arg, flags);
1968 dsl_pool_config_enter(dp, FTAG);
1969 strfree(child);
1970 if (err != 0)
1971 break;
1972 }
1973 zap_cursor_fini(&zc);
1974
1975 if (err != 0) {
1976 dsl_dir_rele(dd, FTAG);
1977 dsl_pool_config_exit(dp, FTAG);
1978 kmem_free(attr, sizeof (zap_attribute_t));
1979 return (err);
1980 }
1981 }
1982
1983 /*
1984 * Iterate over all snapshots.
1985 */
1986 if (flags & DS_FIND_SNAPSHOTS) {
1987 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1988
1989 if (err == 0) {
1990 uint64_t snapobj;
1991
1992 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
1993 dsl_dataset_rele(ds, FTAG);
1994
1995 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1996 zap_cursor_retrieve(&zc, attr) == 0;
1997 (void) zap_cursor_advance(&zc)) {
1998 ASSERT3U(attr->za_integer_length, ==,
1999 sizeof (uint64_t));
2000 ASSERT3U(attr->za_num_integers, ==, 1);
2001
2002 child = kmem_asprintf("%s@%s",
2003 name, attr->za_name);
2004 dsl_pool_config_exit(dp, FTAG);
2005 err = func(child, arg);
2006 dsl_pool_config_enter(dp, FTAG);
2007 strfree(child);
2008 if (err != 0)
2009 break;
2010 }
2011 zap_cursor_fini(&zc);
2012 }
2013 }
2014
2015 dsl_dir_rele(dd, FTAG);
2016 kmem_free(attr, sizeof (zap_attribute_t));
2017 dsl_pool_config_exit(dp, FTAG);
2018
2019 if (err != 0)
2020 return (err);
2021
2022 /* Apply to self. */
2023 return (func(name, arg));
2024 }
2025
2026 /*
2027 * See comment above dmu_objset_find_impl().
2028 */
2029 int
dmu_objset_find(char * name,int func (const char *,void *),void * arg,int flags)2030 dmu_objset_find(char *name, int func(const char *, void *), void *arg,
2031 int flags)
2032 {
2033 spa_t *spa;
2034 int error;
2035
2036 error = spa_open(name, &spa, FTAG);
2037 if (error != 0)
2038 return (error);
2039 error = dmu_objset_find_impl(spa, name, func, arg, flags);
2040 spa_close(spa, FTAG);
2041 return (error);
2042 }
2043
2044 void
dmu_objset_set_user(objset_t * os,void * user_ptr)2045 dmu_objset_set_user(objset_t *os, void *user_ptr)
2046 {
2047 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
2048 os->os_user_ptr = user_ptr;
2049 }
2050
2051 void *
dmu_objset_get_user(objset_t * os)2052 dmu_objset_get_user(objset_t *os)
2053 {
2054 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
2055 return (os->os_user_ptr);
2056 }
2057
2058 /*
2059 * Determine name of filesystem, given name of snapshot.
2060 * buf must be at least ZFS_MAX_DATASET_NAME_LEN bytes
2061 */
2062 int
dmu_fsname(const char * snapname,char * buf)2063 dmu_fsname(const char *snapname, char *buf)
2064 {
2065 char *atp = strchr(snapname, '@');
2066 if (atp == NULL)
2067 return (SET_ERROR(EINVAL));
2068 if (atp - snapname >= ZFS_MAX_DATASET_NAME_LEN)
2069 return (SET_ERROR(ENAMETOOLONG));
2070 (void) strlcpy(buf, snapname, atp - snapname + 1);
2071 return (0);
2072 }
2073