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 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <sys/cred.h>
27 #include <sys/zfs_context.h>
28 #include <sys/dmu_objset.h>
29 #include <sys/dsl_dir.h>
30 #include <sys/dsl_dataset.h>
31 #include <sys/dsl_prop.h>
32 #include <sys/dsl_pool.h>
33 #include <sys/dsl_synctask.h>
34 #include <sys/dsl_deleg.h>
35 #include <sys/dnode.h>
36 #include <sys/dbuf.h>
37 #include <sys/zvol.h>
38 #include <sys/dmu_tx.h>
39 #include <sys/zap.h>
40 #include <sys/zil.h>
41 #include <sys/dmu_impl.h>
42 #include <sys/zfs_ioctl.h>
43 #include <sys/sunddi.h>
44
45 spa_t *
dmu_objset_spa(objset_t * os)46 dmu_objset_spa(objset_t *os)
47 {
48 return (os->os_spa);
49 }
50
51 zilog_t *
dmu_objset_zil(objset_t * os)52 dmu_objset_zil(objset_t *os)
53 {
54 return (os->os_zil);
55 }
56
57 dsl_pool_t *
dmu_objset_pool(objset_t * os)58 dmu_objset_pool(objset_t *os)
59 {
60 dsl_dataset_t *ds;
61
62 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir)
63 return (ds->ds_dir->dd_pool);
64 else
65 return (spa_get_dsl(os->os_spa));
66 }
67
68 dsl_dataset_t *
dmu_objset_ds(objset_t * os)69 dmu_objset_ds(objset_t *os)
70 {
71 return (os->os_dsl_dataset);
72 }
73
74 dmu_objset_type_t
dmu_objset_type(objset_t * os)75 dmu_objset_type(objset_t *os)
76 {
77 return (os->os_phys->os_type);
78 }
79
80 void
dmu_objset_name(objset_t * os,char * buf)81 dmu_objset_name(objset_t *os, char *buf)
82 {
83 dsl_dataset_name(os->os_dsl_dataset, buf);
84 }
85
86 uint64_t
dmu_objset_id(objset_t * os)87 dmu_objset_id(objset_t *os)
88 {
89 dsl_dataset_t *ds = os->os_dsl_dataset;
90
91 return (ds ? ds->ds_object : 0);
92 }
93
94 uint64_t
dmu_objset_logbias(objset_t * os)95 dmu_objset_logbias(objset_t *os)
96 {
97 return (os->os_logbias);
98 }
99
100 static void
checksum_changed_cb(void * arg,uint64_t newval)101 checksum_changed_cb(void *arg, uint64_t newval)
102 {
103 objset_t *os = arg;
104
105 /*
106 * Inheritance should have been done by now.
107 */
108 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
109
110 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE);
111 }
112
113 static void
compression_changed_cb(void * arg,uint64_t newval)114 compression_changed_cb(void *arg, uint64_t newval)
115 {
116 objset_t *os = arg;
117
118 /*
119 * Inheritance and range checking should have been done by now.
120 */
121 ASSERT(newval != ZIO_COMPRESS_INHERIT);
122
123 os->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE);
124 }
125
126 static void
copies_changed_cb(void * arg,uint64_t newval)127 copies_changed_cb(void *arg, uint64_t newval)
128 {
129 objset_t *os = arg;
130
131 /*
132 * Inheritance and range checking should have been done by now.
133 */
134 ASSERT(newval > 0);
135 ASSERT(newval <= spa_max_replication(os->os_spa));
136
137 os->os_copies = newval;
138 }
139
140 static void
dedup_changed_cb(void * arg,uint64_t newval)141 dedup_changed_cb(void *arg, uint64_t newval)
142 {
143 objset_t *os = arg;
144 spa_t *spa = os->os_spa;
145 enum zio_checksum checksum;
146
147 /*
148 * Inheritance should have been done by now.
149 */
150 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
151
152 checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF);
153
154 os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK;
155 os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY);
156 }
157
158 static void
primary_cache_changed_cb(void * arg,uint64_t newval)159 primary_cache_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 == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
167 newval == ZFS_CACHE_METADATA);
168
169 os->os_primary_cache = newval;
170 }
171
172 static void
secondary_cache_changed_cb(void * arg,uint64_t newval)173 secondary_cache_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 == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
181 newval == ZFS_CACHE_METADATA);
182
183 os->os_secondary_cache = newval;
184 }
185
186 static void
logbias_changed_cb(void * arg,uint64_t newval)187 logbias_changed_cb(void *arg, uint64_t newval)
188 {
189 objset_t *os = arg;
190
191 ASSERT(newval == ZFS_LOGBIAS_LATENCY ||
192 newval == ZFS_LOGBIAS_THROUGHPUT);
193 os->os_logbias = newval;
194 if (os->os_zil)
195 zil_set_logbias(os->os_zil, newval);
196 }
197
198 void
dmu_objset_byteswap(void * buf,size_t size)199 dmu_objset_byteswap(void *buf, size_t size)
200 {
201 objset_phys_t *osp = buf;
202
203 ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t));
204 dnode_byteswap(&osp->os_meta_dnode);
205 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t));
206 osp->os_type = BSWAP_64(osp->os_type);
207 osp->os_flags = BSWAP_64(osp->os_flags);
208 if (size == sizeof (objset_phys_t)) {
209 dnode_byteswap(&osp->os_userused_dnode);
210 dnode_byteswap(&osp->os_groupused_dnode);
211 }
212 }
213
214 int
dmu_objset_open_impl(spa_t * spa,dsl_dataset_t * ds,blkptr_t * bp,objset_t ** osp)215 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
216 objset_t **osp)
217 {
218 objset_t *os;
219 int i, err;
220
221 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock));
222
223 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP);
224 os->os_dsl_dataset = ds;
225 os->os_spa = spa;
226 os->os_rootbp = bp;
227 if (!BP_IS_HOLE(os->os_rootbp)) {
228 uint32_t aflags = ARC_WAIT;
229 zbookmark_t zb;
230 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
231 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
232
233 if (DMU_OS_IS_L2CACHEABLE(os))
234 aflags |= ARC_L2CACHE;
235
236 dprintf_bp(os->os_rootbp, "reading %s", "");
237 /*
238 * NB: when bprewrite scrub can change the bp,
239 * and this is called from dmu_objset_open_ds_os, the bp
240 * could change, and we'll need a lock.
241 */
242 err = arc_read_nolock(NULL, spa, os->os_rootbp,
243 arc_getbuf_func, &os->os_phys_buf,
244 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb);
245 if (err) {
246 kmem_free(os, sizeof (objset_t));
247 /* convert checksum errors into IO errors */
248 if (err == ECKSUM)
249 err = EIO;
250 return (err);
251 }
252
253 /* Increase the blocksize if we are permitted. */
254 if (spa_version(spa) >= SPA_VERSION_USERSPACE &&
255 arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) {
256 arc_buf_t *buf = arc_buf_alloc(spa,
257 sizeof (objset_phys_t), &os->os_phys_buf,
258 ARC_BUFC_METADATA);
259 bzero(buf->b_data, sizeof (objset_phys_t));
260 bcopy(os->os_phys_buf->b_data, buf->b_data,
261 arc_buf_size(os->os_phys_buf));
262 (void) arc_buf_remove_ref(os->os_phys_buf,
263 &os->os_phys_buf);
264 os->os_phys_buf = buf;
265 }
266
267 os->os_phys = os->os_phys_buf->b_data;
268 os->os_flags = os->os_phys->os_flags;
269 } else {
270 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ?
271 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE;
272 os->os_phys_buf = arc_buf_alloc(spa, size,
273 &os->os_phys_buf, ARC_BUFC_METADATA);
274 os->os_phys = os->os_phys_buf->b_data;
275 bzero(os->os_phys, size);
276 }
277
278 /*
279 * Note: the changed_cb will be called once before the register
280 * func returns, thus changing the checksum/compression from the
281 * default (fletcher2/off). Snapshots don't need to know about
282 * checksum/compression/copies.
283 */
284 if (ds) {
285 err = dsl_prop_register(ds, "primarycache",
286 primary_cache_changed_cb, os);
287 if (err == 0)
288 err = dsl_prop_register(ds, "secondarycache",
289 secondary_cache_changed_cb, os);
290 if (!dsl_dataset_is_snapshot(ds)) {
291 if (err == 0)
292 err = dsl_prop_register(ds, "checksum",
293 checksum_changed_cb, os);
294 if (err == 0)
295 err = dsl_prop_register(ds, "compression",
296 compression_changed_cb, os);
297 if (err == 0)
298 err = dsl_prop_register(ds, "copies",
299 copies_changed_cb, os);
300 if (err == 0)
301 err = dsl_prop_register(ds, "dedup",
302 dedup_changed_cb, os);
303 if (err == 0)
304 err = dsl_prop_register(ds, "logbias",
305 logbias_changed_cb, os);
306 }
307 if (err) {
308 VERIFY(arc_buf_remove_ref(os->os_phys_buf,
309 &os->os_phys_buf) == 1);
310 kmem_free(os, sizeof (objset_t));
311 return (err);
312 }
313 } else if (ds == NULL) {
314 /* It's the meta-objset. */
315 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
316 os->os_compress = ZIO_COMPRESS_LZJB;
317 os->os_copies = spa_max_replication(spa);
318 os->os_dedup_checksum = ZIO_CHECKSUM_OFF;
319 os->os_dedup_verify = 0;
320 os->os_logbias = 0;
321 os->os_primary_cache = ZFS_CACHE_ALL;
322 os->os_secondary_cache = ZFS_CACHE_ALL;
323 }
324
325 os->os_zil_header = os->os_phys->os_zil_header;
326 os->os_zil = zil_alloc(os, &os->os_zil_header);
327
328 for (i = 0; i < TXG_SIZE; i++) {
329 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t),
330 offsetof(dnode_t, dn_dirty_link[i]));
331 list_create(&os->os_free_dnodes[i], sizeof (dnode_t),
332 offsetof(dnode_t, dn_dirty_link[i]));
333 }
334 list_create(&os->os_dnodes, sizeof (dnode_t),
335 offsetof(dnode_t, dn_link));
336 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
337 offsetof(dmu_buf_impl_t, db_link));
338
339 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL);
340 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
341 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);
342
343 os->os_meta_dnode = dnode_special_open(os,
344 &os->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT);
345 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
346 os->os_userused_dnode = dnode_special_open(os,
347 &os->os_phys->os_userused_dnode, DMU_USERUSED_OBJECT);
348 os->os_groupused_dnode = dnode_special_open(os,
349 &os->os_phys->os_groupused_dnode, DMU_GROUPUSED_OBJECT);
350 }
351
352 /*
353 * We should be the only thread trying to do this because we
354 * have ds_opening_lock
355 */
356 if (ds) {
357 mutex_enter(&ds->ds_lock);
358 ASSERT(ds->ds_objset == NULL);
359 ds->ds_objset = os;
360 mutex_exit(&ds->ds_lock);
361 }
362
363 *osp = os;
364 return (0);
365 }
366
367 int
dmu_objset_from_ds(dsl_dataset_t * ds,objset_t ** osp)368 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
369 {
370 int err = 0;
371
372 mutex_enter(&ds->ds_opening_lock);
373 *osp = ds->ds_objset;
374 if (*osp == NULL) {
375 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
376 ds, &ds->ds_phys->ds_bp, osp);
377 }
378 mutex_exit(&ds->ds_opening_lock);
379 return (err);
380 }
381
382 /* called from zpl */
383 int
dmu_objset_hold(const char * name,void * tag,objset_t ** osp)384 dmu_objset_hold(const char *name, void *tag, objset_t **osp)
385 {
386 dsl_dataset_t *ds;
387 int err;
388
389 err = dsl_dataset_hold(name, tag, &ds);
390 if (err)
391 return (err);
392
393 err = dmu_objset_from_ds(ds, osp);
394 if (err)
395 dsl_dataset_rele(ds, tag);
396
397 return (err);
398 }
399
400 /* called from zpl */
401 int
dmu_objset_own(const char * name,dmu_objset_type_t type,boolean_t readonly,void * tag,objset_t ** osp)402 dmu_objset_own(const char *name, dmu_objset_type_t type,
403 boolean_t readonly, void *tag, objset_t **osp)
404 {
405 dsl_dataset_t *ds;
406 int err;
407
408 err = dsl_dataset_own(name, B_FALSE, tag, &ds);
409 if (err)
410 return (err);
411
412 err = dmu_objset_from_ds(ds, osp);
413 if (err) {
414 dsl_dataset_disown(ds, tag);
415 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) {
416 dmu_objset_disown(*osp, tag);
417 return (EINVAL);
418 } else if (!readonly && dsl_dataset_is_snapshot(ds)) {
419 dmu_objset_disown(*osp, tag);
420 return (EROFS);
421 }
422 return (err);
423 }
424
425 void
dmu_objset_rele(objset_t * os,void * tag)426 dmu_objset_rele(objset_t *os, void *tag)
427 {
428 dsl_dataset_rele(os->os_dsl_dataset, tag);
429 }
430
431 void
dmu_objset_disown(objset_t * os,void * tag)432 dmu_objset_disown(objset_t *os, void *tag)
433 {
434 dsl_dataset_disown(os->os_dsl_dataset, tag);
435 }
436
437 int
dmu_objset_evict_dbufs(objset_t * os)438 dmu_objset_evict_dbufs(objset_t *os)
439 {
440 dnode_t *dn;
441
442 mutex_enter(&os->os_lock);
443
444 /* process the mdn last, since the other dnodes have holds on it */
445 list_remove(&os->os_dnodes, os->os_meta_dnode);
446 list_insert_tail(&os->os_dnodes, os->os_meta_dnode);
447
448 /*
449 * Find the first dnode with holds. We have to do this dance
450 * because dnode_add_ref() only works if you already have a
451 * hold. If there are no holds then it has no dbufs so OK to
452 * skip.
453 */
454 for (dn = list_head(&os->os_dnodes);
455 dn && !dnode_add_ref(dn, FTAG);
456 dn = list_next(&os->os_dnodes, dn))
457 continue;
458
459 while (dn) {
460 dnode_t *next_dn = dn;
461
462 do {
463 next_dn = list_next(&os->os_dnodes, next_dn);
464 } while (next_dn && !dnode_add_ref(next_dn, FTAG));
465
466 mutex_exit(&os->os_lock);
467 dnode_evict_dbufs(dn);
468 dnode_rele(dn, FTAG);
469 mutex_enter(&os->os_lock);
470 dn = next_dn;
471 }
472 mutex_exit(&os->os_lock);
473 return (list_head(&os->os_dnodes) != os->os_meta_dnode);
474 }
475
476 void
dmu_objset_evict(objset_t * os)477 dmu_objset_evict(objset_t *os)
478 {
479 dsl_dataset_t *ds = os->os_dsl_dataset;
480
481 for (int t = 0; t < TXG_SIZE; t++)
482 ASSERT(!dmu_objset_is_dirty(os, t));
483
484 if (ds) {
485 if (!dsl_dataset_is_snapshot(ds)) {
486 VERIFY(0 == dsl_prop_unregister(ds, "checksum",
487 checksum_changed_cb, os));
488 VERIFY(0 == dsl_prop_unregister(ds, "compression",
489 compression_changed_cb, os));
490 VERIFY(0 == dsl_prop_unregister(ds, "copies",
491 copies_changed_cb, os));
492 VERIFY(0 == dsl_prop_unregister(ds, "dedup",
493 dedup_changed_cb, os));
494 VERIFY(0 == dsl_prop_unregister(ds, "logbias",
495 logbias_changed_cb, os));
496 }
497 VERIFY(0 == dsl_prop_unregister(ds, "primarycache",
498 primary_cache_changed_cb, os));
499 VERIFY(0 == dsl_prop_unregister(ds, "secondarycache",
500 secondary_cache_changed_cb, os));
501 }
502
503 /*
504 * We should need only a single pass over the dnode list, since
505 * nothing can be added to the list at this point.
506 */
507 (void) dmu_objset_evict_dbufs(os);
508
509 dnode_special_close(os->os_meta_dnode);
510 if (os->os_userused_dnode) {
511 dnode_special_close(os->os_userused_dnode);
512 dnode_special_close(os->os_groupused_dnode);
513 }
514 zil_free(os->os_zil);
515
516 ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
517
518 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf) == 1);
519 mutex_destroy(&os->os_lock);
520 mutex_destroy(&os->os_obj_lock);
521 mutex_destroy(&os->os_user_ptr_lock);
522 kmem_free(os, sizeof (objset_t));
523 }
524
525 timestruc_t
dmu_objset_snap_cmtime(objset_t * os)526 dmu_objset_snap_cmtime(objset_t *os)
527 {
528 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
529 }
530
531 /* called from dsl for meta-objset */
532 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)533 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
534 dmu_objset_type_t type, dmu_tx_t *tx)
535 {
536 objset_t *os;
537 dnode_t *mdn;
538
539 ASSERT(dmu_tx_is_syncing(tx));
540 if (ds)
541 mutex_enter(&ds->ds_opening_lock);
542 VERIFY(0 == dmu_objset_open_impl(spa, ds, bp, &os));
543 if (ds)
544 mutex_exit(&ds->ds_opening_lock);
545 mdn = os->os_meta_dnode;
546
547 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT,
548 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx);
549
550 /*
551 * We don't want to have to increase the meta-dnode's nlevels
552 * later, because then we could do it in quescing context while
553 * we are also accessing it in open context.
554 *
555 * This precaution is not necessary for the MOS (ds == NULL),
556 * because the MOS is only updated in syncing context.
557 * This is most fortunate: the MOS is the only objset that
558 * needs to be synced multiple times as spa_sync() iterates
559 * to convergence, so minimizing its dn_nlevels matters.
560 */
561 if (ds != NULL) {
562 int levels = 1;
563
564 /*
565 * Determine the number of levels necessary for the meta-dnode
566 * to contain DN_MAX_OBJECT dnodes.
567 */
568 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift +
569 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) <
570 DN_MAX_OBJECT * sizeof (dnode_phys_t))
571 levels++;
572
573 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] =
574 mdn->dn_nlevels = levels;
575 }
576
577 ASSERT(type != DMU_OST_NONE);
578 ASSERT(type != DMU_OST_ANY);
579 ASSERT(type < DMU_OST_NUMTYPES);
580 os->os_phys->os_type = type;
581 if (dmu_objset_userused_enabled(os)) {
582 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
583 os->os_flags = os->os_phys->os_flags;
584 }
585
586 dsl_dataset_dirty(ds, tx);
587
588 return (os);
589 }
590
591 struct oscarg {
592 void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx);
593 void *userarg;
594 dsl_dataset_t *clone_origin;
595 const char *lastname;
596 dmu_objset_type_t type;
597 uint64_t flags;
598 };
599
600 /*ARGSUSED*/
601 static int
dmu_objset_create_check(void * arg1,void * arg2,dmu_tx_t * tx)602 dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx)
603 {
604 dsl_dir_t *dd = arg1;
605 struct oscarg *oa = arg2;
606 objset_t *mos = dd->dd_pool->dp_meta_objset;
607 int err;
608 uint64_t ddobj;
609
610 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
611 oa->lastname, sizeof (uint64_t), 1, &ddobj);
612 if (err != ENOENT)
613 return (err ? err : EEXIST);
614
615 if (oa->clone_origin != NULL) {
616 /* You can't clone across pools. */
617 if (oa->clone_origin->ds_dir->dd_pool != dd->dd_pool)
618 return (EXDEV);
619
620 /* You can only clone snapshots, not the head datasets. */
621 if (!dsl_dataset_is_snapshot(oa->clone_origin))
622 return (EINVAL);
623 }
624
625 return (0);
626 }
627
628 static void
dmu_objset_create_sync(void * arg1,void * arg2,cred_t * cr,dmu_tx_t * tx)629 dmu_objset_create_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
630 {
631 dsl_dir_t *dd = arg1;
632 struct oscarg *oa = arg2;
633 uint64_t dsobj;
634
635 ASSERT(dmu_tx_is_syncing(tx));
636
637 dsobj = dsl_dataset_create_sync(dd, oa->lastname,
638 oa->clone_origin, oa->flags, cr, tx);
639
640 if (oa->clone_origin == NULL) {
641 dsl_dataset_t *ds;
642 blkptr_t *bp;
643 objset_t *os;
644
645 VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, dsobj,
646 FTAG, &ds));
647 bp = dsl_dataset_get_blkptr(ds);
648 ASSERT(BP_IS_HOLE(bp));
649
650 os = dmu_objset_create_impl(dsl_dataset_get_spa(ds),
651 ds, bp, oa->type, tx);
652
653 if (oa->userfunc)
654 oa->userfunc(os, oa->userarg, cr, tx);
655 dsl_dataset_rele(ds, FTAG);
656 }
657
658 spa_history_internal_log(LOG_DS_CREATE, dd->dd_pool->dp_spa,
659 tx, cr, "dataset = %llu", dsobj);
660 }
661
662 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)663 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
664 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg)
665 {
666 dsl_dir_t *pdd;
667 const char *tail;
668 int err = 0;
669 struct oscarg oa = { 0 };
670
671 ASSERT(strchr(name, '@') == NULL);
672 err = dsl_dir_open(name, FTAG, &pdd, &tail);
673 if (err)
674 return (err);
675 if (tail == NULL) {
676 dsl_dir_close(pdd, FTAG);
677 return (EEXIST);
678 }
679
680 oa.userfunc = func;
681 oa.userarg = arg;
682 oa.lastname = tail;
683 oa.type = type;
684 oa.flags = flags;
685
686 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check,
687 dmu_objset_create_sync, pdd, &oa, 5);
688 dsl_dir_close(pdd, FTAG);
689 return (err);
690 }
691
692 int
dmu_objset_clone(const char * name,dsl_dataset_t * clone_origin,uint64_t flags)693 dmu_objset_clone(const char *name, dsl_dataset_t *clone_origin, uint64_t flags)
694 {
695 dsl_dir_t *pdd;
696 const char *tail;
697 int err = 0;
698 struct oscarg oa = { 0 };
699
700 ASSERT(strchr(name, '@') == NULL);
701 err = dsl_dir_open(name, FTAG, &pdd, &tail);
702 if (err)
703 return (err);
704 if (tail == NULL) {
705 dsl_dir_close(pdd, FTAG);
706 return (EEXIST);
707 }
708
709 oa.lastname = tail;
710 oa.clone_origin = clone_origin;
711 oa.flags = flags;
712
713 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check,
714 dmu_objset_create_sync, pdd, &oa, 5);
715 dsl_dir_close(pdd, FTAG);
716 return (err);
717 }
718
719 int
dmu_objset_destroy(const char * name,boolean_t defer)720 dmu_objset_destroy(const char *name, boolean_t defer)
721 {
722 dsl_dataset_t *ds;
723 int error;
724
725 /*
726 * dsl_dataset_destroy() can free any claimed-but-unplayed
727 * intent log, but if there is an active log, it has blocks that
728 * are allocated, but may not yet be reflected in the on-disk
729 * structure. Only the ZIL knows how to free them, so we have
730 * to call into it here.
731 */
732 error = dsl_dataset_own(name, B_TRUE, FTAG, &ds);
733 if (error == 0) {
734 objset_t *os;
735 if (dmu_objset_from_ds(ds, &os) == 0)
736 zil_destroy(dmu_objset_zil(os), B_FALSE);
737 error = dsl_dataset_destroy(ds, FTAG, defer);
738 /* dsl_dataset_destroy() closes the ds. */
739 }
740
741 return (error);
742 }
743
744 struct snaparg {
745 dsl_sync_task_group_t *dstg;
746 char *snapname;
747 char failed[MAXPATHLEN];
748 boolean_t recursive;
749 nvlist_t *props;
750 };
751
752 static int
snapshot_check(void * arg1,void * arg2,dmu_tx_t * tx)753 snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx)
754 {
755 objset_t *os = arg1;
756 struct snaparg *sn = arg2;
757
758 /* The props have already been checked by zfs_check_userprops(). */
759
760 return (dsl_dataset_snapshot_check(os->os_dsl_dataset,
761 sn->snapname, tx));
762 }
763
764 static void
snapshot_sync(void * arg1,void * arg2,cred_t * cr,dmu_tx_t * tx)765 snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
766 {
767 objset_t *os = arg1;
768 dsl_dataset_t *ds = os->os_dsl_dataset;
769 struct snaparg *sn = arg2;
770
771 dsl_dataset_snapshot_sync(ds, sn->snapname, cr, tx);
772
773 if (sn->props) {
774 dsl_props_arg_t pa;
775 pa.pa_props = sn->props;
776 pa.pa_source = ZPROP_SRC_LOCAL;
777 dsl_props_set_sync(ds->ds_prev, &pa, cr, tx);
778 }
779 }
780
781 static int
dmu_objset_snapshot_one(const char * name,void * arg)782 dmu_objset_snapshot_one(const char *name, void *arg)
783 {
784 struct snaparg *sn = arg;
785 objset_t *os;
786 int err;
787 char *cp;
788
789 /*
790 * If the objset starts with a '%', then ignore it unless it was
791 * explicitly named (ie, not recursive). These hidden datasets
792 * are always inconsistent, and by not opening them here, we can
793 * avoid a race with dsl_dir_destroy_check().
794 */
795 cp = strrchr(name, '/');
796 if (cp && cp[1] == '%' && sn->recursive)
797 return (0);
798
799 (void) strcpy(sn->failed, name);
800
801 /*
802 * Check permissions if we are doing a recursive snapshot. The
803 * permission checks for the starting dataset have already been
804 * performed in zfs_secpolicy_snapshot()
805 */
806 if (sn->recursive && (err = zfs_secpolicy_snapshot_perms(name, CRED())))
807 return (err);
808
809 err = dmu_objset_hold(name, sn, &os);
810 if (err != 0)
811 return (err);
812
813 /*
814 * If the objset is in an inconsistent state (eg, in the process
815 * of being destroyed), don't snapshot it. As with %hidden
816 * datasets, we return EBUSY if this name was explicitly
817 * requested (ie, not recursive), and otherwise ignore it.
818 */
819 if (os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) {
820 dmu_objset_rele(os, sn);
821 return (sn->recursive ? 0 : EBUSY);
822 }
823
824 /*
825 * NB: we need to wait for all in-flight changes to get to disk,
826 * so that we snapshot those changes. zil_suspend does this as
827 * a side effect.
828 */
829 err = zil_suspend(dmu_objset_zil(os));
830 if (err == 0) {
831 dsl_sync_task_create(sn->dstg, snapshot_check,
832 snapshot_sync, os, sn, 3);
833 } else {
834 dmu_objset_rele(os, sn);
835 }
836
837 return (err);
838 }
839
840 int
dmu_objset_snapshot(char * fsname,char * snapname,nvlist_t * props,boolean_t recursive)841 dmu_objset_snapshot(char *fsname, char *snapname,
842 nvlist_t *props, boolean_t recursive)
843 {
844 dsl_sync_task_t *dst;
845 struct snaparg sn;
846 spa_t *spa;
847 int err;
848
849 (void) strcpy(sn.failed, fsname);
850
851 err = spa_open(fsname, &spa, FTAG);
852 if (err)
853 return (err);
854
855 sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
856 sn.snapname = snapname;
857 sn.props = props;
858 sn.recursive = recursive;
859
860 if (recursive) {
861 err = dmu_objset_find(fsname,
862 dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN);
863 } else {
864 err = dmu_objset_snapshot_one(fsname, &sn);
865 }
866
867 if (err == 0)
868 err = dsl_sync_task_group_wait(sn.dstg);
869
870 for (dst = list_head(&sn.dstg->dstg_tasks); dst;
871 dst = list_next(&sn.dstg->dstg_tasks, dst)) {
872 objset_t *os = dst->dst_arg1;
873 dsl_dataset_t *ds = os->os_dsl_dataset;
874 if (dst->dst_err)
875 dsl_dataset_name(ds, sn.failed);
876 zil_resume(dmu_objset_zil(os));
877 dmu_objset_rele(os, &sn);
878 }
879
880 if (err)
881 (void) strcpy(fsname, sn.failed);
882 dsl_sync_task_group_destroy(sn.dstg);
883 spa_close(spa, FTAG);
884 return (err);
885 }
886
887 static void
dmu_objset_sync_dnodes(list_t * list,list_t * newlist,dmu_tx_t * tx)888 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx)
889 {
890 dnode_t *dn;
891
892 while (dn = list_head(list)) {
893 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
894 ASSERT(dn->dn_dbuf->db_data_pending);
895 /*
896 * Initialize dn_zio outside dnode_sync() because the
897 * meta-dnode needs to set it ouside dnode_sync().
898 */
899 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio;
900 ASSERT(dn->dn_zio);
901
902 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS);
903 list_remove(list, dn);
904
905 if (newlist) {
906 (void) dnode_add_ref(dn, newlist);
907 list_insert_tail(newlist, dn);
908 }
909
910 dnode_sync(dn, tx);
911 }
912 }
913
914 /* ARGSUSED */
915 static void
dmu_objset_write_ready(zio_t * zio,arc_buf_t * abuf,void * arg)916 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg)
917 {
918 blkptr_t *bp = zio->io_bp;
919 objset_t *os = arg;
920 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode;
921
922 ASSERT(bp == os->os_rootbp);
923 ASSERT(BP_GET_TYPE(bp) == DMU_OT_OBJSET);
924 ASSERT(BP_GET_LEVEL(bp) == 0);
925
926 /*
927 * Update rootbp fill count: it should be the number of objects
928 * allocated in the object set (not counting the "special"
929 * objects that are stored in the objset_phys_t -- the meta
930 * dnode and user/group accounting objects).
931 */
932 bp->blk_fill = 0;
933 for (int i = 0; i < dnp->dn_nblkptr; i++)
934 bp->blk_fill += dnp->dn_blkptr[i].blk_fill;
935 }
936
937 /* ARGSUSED */
938 static void
dmu_objset_write_done(zio_t * zio,arc_buf_t * abuf,void * arg)939 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg)
940 {
941 blkptr_t *bp = zio->io_bp;
942 blkptr_t *bp_orig = &zio->io_bp_orig;
943 objset_t *os = arg;
944
945 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
946 ASSERT(BP_EQUAL(bp, bp_orig));
947 } else {
948 dsl_dataset_t *ds = os->os_dsl_dataset;
949 dmu_tx_t *tx = os->os_synctx;
950
951 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
952 dsl_dataset_block_born(ds, bp, tx);
953 }
954 }
955
956 /* called from dsl */
957 void
dmu_objset_sync(objset_t * os,zio_t * pio,dmu_tx_t * tx)958 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
959 {
960 int txgoff;
961 zbookmark_t zb;
962 zio_prop_t zp;
963 zio_t *zio;
964 list_t *list;
965 list_t *newlist = NULL;
966 dbuf_dirty_record_t *dr;
967
968 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);
969
970 ASSERT(dmu_tx_is_syncing(tx));
971 /* XXX the write_done callback should really give us the tx... */
972 os->os_synctx = tx;
973
974 if (os->os_dsl_dataset == NULL) {
975 /*
976 * This is the MOS. If we have upgraded,
977 * spa_max_replication() could change, so reset
978 * os_copies here.
979 */
980 os->os_copies = spa_max_replication(os->os_spa);
981 }
982
983 /*
984 * Create the root block IO
985 */
986 arc_release(os->os_phys_buf, &os->os_phys_buf);
987
988 SET_BOOKMARK(&zb, os->os_dsl_dataset ?
989 os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
990 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
991
992 dmu_write_policy(os, NULL, 0, 0, &zp);
993
994 zio = arc_write(pio, os->os_spa, tx->tx_txg,
995 os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), &zp,
996 dmu_objset_write_ready, dmu_objset_write_done, os,
997 ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);
998
999 /*
1000 * Sync special dnodes - the parent IO for the sync is the root block
1001 */
1002 os->os_meta_dnode->dn_zio = zio;
1003 dnode_sync(os->os_meta_dnode, tx);
1004
1005 os->os_phys->os_flags = os->os_flags;
1006
1007 if (os->os_userused_dnode &&
1008 os->os_userused_dnode->dn_type != DMU_OT_NONE) {
1009 os->os_userused_dnode->dn_zio = zio;
1010 dnode_sync(os->os_userused_dnode, tx);
1011 os->os_groupused_dnode->dn_zio = zio;
1012 dnode_sync(os->os_groupused_dnode, tx);
1013 }
1014
1015 txgoff = tx->tx_txg & TXG_MASK;
1016
1017 if (dmu_objset_userused_enabled(os)) {
1018 newlist = &os->os_synced_dnodes;
1019 /*
1020 * We must create the list here because it uses the
1021 * dn_dirty_link[] of this txg.
1022 */
1023 list_create(newlist, sizeof (dnode_t),
1024 offsetof(dnode_t, dn_dirty_link[txgoff]));
1025 }
1026
1027 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx);
1028 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx);
1029
1030 list = &os->os_meta_dnode->dn_dirty_records[txgoff];
1031 while (dr = list_head(list)) {
1032 ASSERT(dr->dr_dbuf->db_level == 0);
1033 list_remove(list, dr);
1034 if (dr->dr_zio)
1035 zio_nowait(dr->dr_zio);
1036 }
1037 /*
1038 * Free intent log blocks up to this tx.
1039 */
1040 zil_sync(os->os_zil, tx);
1041 os->os_phys->os_zil_header = os->os_zil_header;
1042 zio_nowait(zio);
1043 }
1044
1045 boolean_t
dmu_objset_is_dirty(objset_t * os,uint64_t txg)1046 dmu_objset_is_dirty(objset_t *os, uint64_t txg)
1047 {
1048 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) ||
1049 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK]));
1050 }
1051
1052 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES];
1053
1054 void
dmu_objset_register_type(dmu_objset_type_t ost,objset_used_cb_t * cb)1055 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb)
1056 {
1057 used_cbs[ost] = cb;
1058 }
1059
1060 boolean_t
dmu_objset_userused_enabled(objset_t * os)1061 dmu_objset_userused_enabled(objset_t *os)
1062 {
1063 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE &&
1064 used_cbs[os->os_phys->os_type] &&
1065 os->os_userused_dnode);
1066 }
1067
1068 static void
do_userquota_callback(objset_t * os,dnode_phys_t * dnp,boolean_t subtract,dmu_tx_t * tx)1069 do_userquota_callback(objset_t *os, dnode_phys_t *dnp,
1070 boolean_t subtract, dmu_tx_t *tx)
1071 {
1072 static const char zerobuf[DN_MAX_BONUSLEN] = {0};
1073 uint64_t user, group;
1074
1075 ASSERT(dnp->dn_type != 0 ||
1076 (bcmp(DN_BONUS(dnp), zerobuf, DN_MAX_BONUSLEN) == 0 &&
1077 DN_USED_BYTES(dnp) == 0));
1078
1079 if ((dnp->dn_flags & DNODE_FLAG_USERUSED_ACCOUNTED) &&
1080 0 == used_cbs[os->os_phys->os_type](dnp->dn_bonustype,
1081 DN_BONUS(dnp), &user, &group)) {
1082 int64_t delta = DNODE_SIZE + DN_USED_BYTES(dnp);
1083 if (subtract)
1084 delta = -delta;
1085 VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT,
1086 user, delta, tx));
1087 VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT,
1088 group, delta, tx));
1089 }
1090 }
1091
1092 void
dmu_objset_do_userquota_callbacks(objset_t * os,dmu_tx_t * tx)1093 dmu_objset_do_userquota_callbacks(objset_t *os, dmu_tx_t *tx)
1094 {
1095 dnode_t *dn;
1096 list_t *list = &os->os_synced_dnodes;
1097
1098 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
1099
1100 while (dn = list_head(list)) {
1101 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object));
1102 ASSERT(dn->dn_oldphys);
1103 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE ||
1104 dn->dn_phys->dn_flags &
1105 DNODE_FLAG_USERUSED_ACCOUNTED);
1106
1107 /* Allocate the user/groupused objects if necessary. */
1108 if (os->os_userused_dnode->dn_type == DMU_OT_NONE) {
1109 VERIFY(0 == zap_create_claim(os,
1110 DMU_USERUSED_OBJECT,
1111 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1112 VERIFY(0 == zap_create_claim(os,
1113 DMU_GROUPUSED_OBJECT,
1114 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1115 }
1116
1117 /*
1118 * We intentionally modify the zap object even if the
1119 * net delta (due to phys-oldphys) is zero. Otherwise
1120 * the block of the zap obj could be shared between
1121 * datasets but need to be different between them after
1122 * a bprewrite.
1123 */
1124 do_userquota_callback(os, dn->dn_oldphys, B_TRUE, tx);
1125 do_userquota_callback(os, dn->dn_phys, B_FALSE, tx);
1126
1127 /*
1128 * The mutex is needed here for interlock with dnode_allocate.
1129 */
1130 mutex_enter(&dn->dn_mtx);
1131 zio_buf_free(dn->dn_oldphys, sizeof (dnode_phys_t));
1132 dn->dn_oldphys = NULL;
1133 mutex_exit(&dn->dn_mtx);
1134
1135 list_remove(list, dn);
1136 dnode_rele(dn, list);
1137 }
1138 }
1139
1140 boolean_t
dmu_objset_userspace_present(objset_t * os)1141 dmu_objset_userspace_present(objset_t *os)
1142 {
1143 return (os->os_phys->os_flags &
1144 OBJSET_FLAG_USERACCOUNTING_COMPLETE);
1145 }
1146
1147 int
dmu_objset_userspace_upgrade(objset_t * os)1148 dmu_objset_userspace_upgrade(objset_t *os)
1149 {
1150 uint64_t obj;
1151 int err = 0;
1152
1153 if (dmu_objset_userspace_present(os))
1154 return (0);
1155 if (!dmu_objset_userused_enabled(os))
1156 return (ENOTSUP);
1157 if (dmu_objset_is_snapshot(os))
1158 return (EINVAL);
1159
1160 /*
1161 * We simply need to mark every object dirty, so that it will be
1162 * synced out and now accounted. If this is called
1163 * concurrently, or if we already did some work before crashing,
1164 * that's fine, since we track each object's accounted state
1165 * independently.
1166 */
1167
1168 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) {
1169 dmu_tx_t *tx;
1170 dmu_buf_t *db;
1171 int objerr;
1172
1173 if (issig(JUSTLOOKING) && issig(FORREAL))
1174 return (EINTR);
1175
1176 objerr = dmu_bonus_hold(os, obj, FTAG, &db);
1177 if (objerr)
1178 continue;
1179 tx = dmu_tx_create(os);
1180 dmu_tx_hold_bonus(tx, obj);
1181 objerr = dmu_tx_assign(tx, TXG_WAIT);
1182 if (objerr) {
1183 dmu_tx_abort(tx);
1184 continue;
1185 }
1186 dmu_buf_will_dirty(db, tx);
1187 dmu_buf_rele(db, FTAG);
1188 dmu_tx_commit(tx);
1189 }
1190
1191 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
1192 txg_wait_synced(dmu_objset_pool(os), 0);
1193 return (0);
1194 }
1195
1196 void
dmu_objset_space(objset_t * os,uint64_t * refdbytesp,uint64_t * availbytesp,uint64_t * usedobjsp,uint64_t * availobjsp)1197 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
1198 uint64_t *usedobjsp, uint64_t *availobjsp)
1199 {
1200 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp,
1201 usedobjsp, availobjsp);
1202 }
1203
1204 uint64_t
dmu_objset_fsid_guid(objset_t * os)1205 dmu_objset_fsid_guid(objset_t *os)
1206 {
1207 return (dsl_dataset_fsid_guid(os->os_dsl_dataset));
1208 }
1209
1210 void
dmu_objset_fast_stat(objset_t * os,dmu_objset_stats_t * stat)1211 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat)
1212 {
1213 stat->dds_type = os->os_phys->os_type;
1214 if (os->os_dsl_dataset)
1215 dsl_dataset_fast_stat(os->os_dsl_dataset, stat);
1216 }
1217
1218 void
dmu_objset_stats(objset_t * os,nvlist_t * nv)1219 dmu_objset_stats(objset_t *os, nvlist_t *nv)
1220 {
1221 ASSERT(os->os_dsl_dataset ||
1222 os->os_phys->os_type == DMU_OST_META);
1223
1224 if (os->os_dsl_dataset != NULL)
1225 dsl_dataset_stats(os->os_dsl_dataset, nv);
1226
1227 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
1228 os->os_phys->os_type);
1229 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING,
1230 dmu_objset_userspace_present(os));
1231 }
1232
1233 int
dmu_objset_is_snapshot(objset_t * os)1234 dmu_objset_is_snapshot(objset_t *os)
1235 {
1236 if (os->os_dsl_dataset != NULL)
1237 return (dsl_dataset_is_snapshot(os->os_dsl_dataset));
1238 else
1239 return (B_FALSE);
1240 }
1241
1242 int
dmu_snapshot_realname(objset_t * os,char * name,char * real,int maxlen,boolean_t * conflict)1243 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
1244 boolean_t *conflict)
1245 {
1246 dsl_dataset_t *ds = os->os_dsl_dataset;
1247 uint64_t ignored;
1248
1249 if (ds->ds_phys->ds_snapnames_zapobj == 0)
1250 return (ENOENT);
1251
1252 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset,
1253 ds->ds_phys->ds_snapnames_zapobj, name, 8, 1, &ignored, MT_FIRST,
1254 real, maxlen, conflict));
1255 }
1256
1257 int
dmu_snapshot_list_next(objset_t * os,int namelen,char * name,uint64_t * idp,uint64_t * offp,boolean_t * case_conflict)1258 dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
1259 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict)
1260 {
1261 dsl_dataset_t *ds = os->os_dsl_dataset;
1262 zap_cursor_t cursor;
1263 zap_attribute_t attr;
1264
1265 if (ds->ds_phys->ds_snapnames_zapobj == 0)
1266 return (ENOENT);
1267
1268 zap_cursor_init_serialized(&cursor,
1269 ds->ds_dir->dd_pool->dp_meta_objset,
1270 ds->ds_phys->ds_snapnames_zapobj, *offp);
1271
1272 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1273 zap_cursor_fini(&cursor);
1274 return (ENOENT);
1275 }
1276
1277 if (strlen(attr.za_name) + 1 > namelen) {
1278 zap_cursor_fini(&cursor);
1279 return (ENAMETOOLONG);
1280 }
1281
1282 (void) strcpy(name, attr.za_name);
1283 if (idp)
1284 *idp = attr.za_first_integer;
1285 if (case_conflict)
1286 *case_conflict = attr.za_normalization_conflict;
1287 zap_cursor_advance(&cursor);
1288 *offp = zap_cursor_serialize(&cursor);
1289 zap_cursor_fini(&cursor);
1290
1291 return (0);
1292 }
1293
1294 int
dmu_dir_list_next(objset_t * os,int namelen,char * name,uint64_t * idp,uint64_t * offp)1295 dmu_dir_list_next(objset_t *os, int namelen, char *name,
1296 uint64_t *idp, uint64_t *offp)
1297 {
1298 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir;
1299 zap_cursor_t cursor;
1300 zap_attribute_t attr;
1301
1302 /* there is no next dir on a snapshot! */
1303 if (os->os_dsl_dataset->ds_object !=
1304 dd->dd_phys->dd_head_dataset_obj)
1305 return (ENOENT);
1306
1307 zap_cursor_init_serialized(&cursor,
1308 dd->dd_pool->dp_meta_objset,
1309 dd->dd_phys->dd_child_dir_zapobj, *offp);
1310
1311 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1312 zap_cursor_fini(&cursor);
1313 return (ENOENT);
1314 }
1315
1316 if (strlen(attr.za_name) + 1 > namelen) {
1317 zap_cursor_fini(&cursor);
1318 return (ENAMETOOLONG);
1319 }
1320
1321 (void) strcpy(name, attr.za_name);
1322 if (idp)
1323 *idp = attr.za_first_integer;
1324 zap_cursor_advance(&cursor);
1325 *offp = zap_cursor_serialize(&cursor);
1326 zap_cursor_fini(&cursor);
1327
1328 return (0);
1329 }
1330
1331 struct findarg {
1332 int (*func)(const char *, void *);
1333 void *arg;
1334 };
1335
1336 /* ARGSUSED */
1337 static int
findfunc(spa_t * spa,uint64_t dsobj,const char * dsname,void * arg)1338 findfunc(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg)
1339 {
1340 struct findarg *fa = arg;
1341 return (fa->func(dsname, fa->arg));
1342 }
1343
1344 /*
1345 * Find all objsets under name, and for each, call 'func(child_name, arg)'.
1346 * Perhaps change all callers to use dmu_objset_find_spa()?
1347 */
1348 int
dmu_objset_find(char * name,int func (const char *,void *),void * arg,int flags)1349 dmu_objset_find(char *name, int func(const char *, void *), void *arg,
1350 int flags)
1351 {
1352 struct findarg fa;
1353 fa.func = func;
1354 fa.arg = arg;
1355 return (dmu_objset_find_spa(NULL, name, findfunc, &fa, flags));
1356 }
1357
1358 /*
1359 * Find all objsets under name, call func on each
1360 */
1361 int
dmu_objset_find_spa(spa_t * spa,const char * name,int func (spa_t *,uint64_t,const char *,void *),void * arg,int flags)1362 dmu_objset_find_spa(spa_t *spa, const char *name,
1363 int func(spa_t *, uint64_t, const char *, void *), void *arg, int flags)
1364 {
1365 dsl_dir_t *dd;
1366 dsl_pool_t *dp;
1367 dsl_dataset_t *ds;
1368 zap_cursor_t zc;
1369 zap_attribute_t *attr;
1370 char *child;
1371 uint64_t thisobj;
1372 int err;
1373
1374 if (name == NULL)
1375 name = spa_name(spa);
1376 err = dsl_dir_open_spa(spa, name, FTAG, &dd, NULL);
1377 if (err)
1378 return (err);
1379
1380 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1381 if (dd->dd_myname[0] == '$') {
1382 dsl_dir_close(dd, FTAG);
1383 return (0);
1384 }
1385
1386 thisobj = dd->dd_phys->dd_head_dataset_obj;
1387 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1388 dp = dd->dd_pool;
1389
1390 /*
1391 * Iterate over all children.
1392 */
1393 if (flags & DS_FIND_CHILDREN) {
1394 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1395 dd->dd_phys->dd_child_dir_zapobj);
1396 zap_cursor_retrieve(&zc, attr) == 0;
1397 (void) zap_cursor_advance(&zc)) {
1398 ASSERT(attr->za_integer_length == sizeof (uint64_t));
1399 ASSERT(attr->za_num_integers == 1);
1400
1401 child = kmem_asprintf("%s/%s", name, attr->za_name);
1402 err = dmu_objset_find_spa(spa, child, func, arg, flags);
1403 strfree(child);
1404 if (err)
1405 break;
1406 }
1407 zap_cursor_fini(&zc);
1408
1409 if (err) {
1410 dsl_dir_close(dd, FTAG);
1411 kmem_free(attr, sizeof (zap_attribute_t));
1412 return (err);
1413 }
1414 }
1415
1416 /*
1417 * Iterate over all snapshots.
1418 */
1419 if (flags & DS_FIND_SNAPSHOTS) {
1420 if (!dsl_pool_sync_context(dp))
1421 rw_enter(&dp->dp_config_rwlock, RW_READER);
1422 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1423 if (!dsl_pool_sync_context(dp))
1424 rw_exit(&dp->dp_config_rwlock);
1425
1426 if (err == 0) {
1427 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
1428 dsl_dataset_rele(ds, FTAG);
1429
1430 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1431 zap_cursor_retrieve(&zc, attr) == 0;
1432 (void) zap_cursor_advance(&zc)) {
1433 ASSERT(attr->za_integer_length ==
1434 sizeof (uint64_t));
1435 ASSERT(attr->za_num_integers == 1);
1436
1437 child = kmem_asprintf("%s@%s",
1438 name, attr->za_name);
1439 err = func(spa, attr->za_first_integer,
1440 child, arg);
1441 strfree(child);
1442 if (err)
1443 break;
1444 }
1445 zap_cursor_fini(&zc);
1446 }
1447 }
1448
1449 dsl_dir_close(dd, FTAG);
1450 kmem_free(attr, sizeof (zap_attribute_t));
1451
1452 if (err)
1453 return (err);
1454
1455 /*
1456 * Apply to self if appropriate.
1457 */
1458 err = func(spa, thisobj, name, arg);
1459 return (err);
1460 }
1461
1462 /* ARGSUSED */
1463 int
dmu_objset_prefetch(const char * name,void * arg)1464 dmu_objset_prefetch(const char *name, void *arg)
1465 {
1466 dsl_dataset_t *ds;
1467
1468 if (dsl_dataset_hold(name, FTAG, &ds))
1469 return (0);
1470
1471 if (!BP_IS_HOLE(&ds->ds_phys->ds_bp)) {
1472 mutex_enter(&ds->ds_opening_lock);
1473 if (ds->ds_objset == NULL) {
1474 uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH;
1475 zbookmark_t zb;
1476
1477 SET_BOOKMARK(&zb, ds->ds_object, ZB_ROOT_OBJECT,
1478 ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
1479
1480 (void) arc_read_nolock(NULL, dsl_dataset_get_spa(ds),
1481 &ds->ds_phys->ds_bp, NULL, NULL,
1482 ZIO_PRIORITY_ASYNC_READ,
1483 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE,
1484 &aflags, &zb);
1485 }
1486 mutex_exit(&ds->ds_opening_lock);
1487 }
1488
1489 dsl_dataset_rele(ds, FTAG);
1490 return (0);
1491 }
1492
1493 void
dmu_objset_set_user(objset_t * os,void * user_ptr)1494 dmu_objset_set_user(objset_t *os, void *user_ptr)
1495 {
1496 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1497 os->os_user_ptr = user_ptr;
1498 }
1499
1500 void *
dmu_objset_get_user(objset_t * os)1501 dmu_objset_get_user(objset_t *os)
1502 {
1503 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1504 return (os->os_user_ptr);
1505 }
1506