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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 | */ | |
24 | ||
25 | /* Portions Copyright 2010 Robert Milkowski */ | |
26 | ||
27 | #include <sys/cred.h> | |
28 | #include <sys/zfs_context.h> | |
29 | #include <sys/dmu_objset.h> | |
30 | #include <sys/dsl_dir.h> | |
31 | #include <sys/dsl_dataset.h> | |
32 | #include <sys/dsl_prop.h> | |
33 | #include <sys/dsl_pool.h> | |
34 | #include <sys/dsl_synctask.h> | |
35 | #include <sys/dsl_deleg.h> | |
36 | #include <sys/dnode.h> | |
37 | #include <sys/dbuf.h> | |
38 | #include <sys/zvol.h> | |
39 | #include <sys/dmu_tx.h> | |
40 | #include <sys/zap.h> | |
41 | #include <sys/zil.h> | |
42 | #include <sys/dmu_impl.h> | |
43 | #include <sys/zfs_ioctl.h> | |
44 | #include <sys/sa.h> | |
45 | #include <sys/zfs_onexit.h> | |
46 | ||
47 | /* | |
48 | * Needed to close a window in dnode_move() that allows the objset to be freed | |
49 | * before it can be safely accessed. | |
50 | */ | |
51 | krwlock_t os_lock; | |
52 | ||
53 | void | |
54 | dmu_objset_init(void) | |
55 | { | |
56 | rw_init(&os_lock, NULL, RW_DEFAULT, NULL); | |
57 | } | |
58 | ||
59 | void | |
60 | dmu_objset_fini(void) | |
61 | { | |
62 | rw_destroy(&os_lock); | |
63 | } | |
64 | ||
65 | spa_t * | |
66 | dmu_objset_spa(objset_t *os) | |
67 | { | |
68 | return (os->os_spa); | |
69 | } | |
70 | ||
71 | zilog_t * | |
72 | dmu_objset_zil(objset_t *os) | |
73 | { | |
74 | return (os->os_zil); | |
75 | } | |
76 | ||
77 | dsl_pool_t * | |
78 | dmu_objset_pool(objset_t *os) | |
79 | { | |
80 | dsl_dataset_t *ds; | |
81 | ||
82 | if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir) | |
83 | return (ds->ds_dir->dd_pool); | |
84 | else | |
85 | return (spa_get_dsl(os->os_spa)); | |
86 | } | |
87 | ||
88 | dsl_dataset_t * | |
89 | dmu_objset_ds(objset_t *os) | |
90 | { | |
91 | return (os->os_dsl_dataset); | |
92 | } | |
93 | ||
94 | dmu_objset_type_t | |
95 | dmu_objset_type(objset_t *os) | |
96 | { | |
97 | return (os->os_phys->os_type); | |
98 | } | |
99 | ||
100 | void | |
101 | dmu_objset_name(objset_t *os, char *buf) | |
102 | { | |
103 | dsl_dataset_name(os->os_dsl_dataset, buf); | |
104 | } | |
105 | ||
106 | uint64_t | |
107 | dmu_objset_id(objset_t *os) | |
108 | { | |
109 | dsl_dataset_t *ds = os->os_dsl_dataset; | |
110 | ||
111 | return (ds ? ds->ds_object : 0); | |
112 | } | |
113 | ||
114 | uint64_t | |
115 | dmu_objset_syncprop(objset_t *os) | |
116 | { | |
117 | return (os->os_sync); | |
118 | } | |
119 | ||
120 | uint64_t | |
121 | dmu_objset_logbias(objset_t *os) | |
122 | { | |
123 | return (os->os_logbias); | |
124 | } | |
125 | ||
126 | static void | |
127 | checksum_changed_cb(void *arg, uint64_t newval) | |
128 | { | |
129 | objset_t *os = arg; | |
130 | ||
131 | /* | |
132 | * Inheritance should have been done by now. | |
133 | */ | |
134 | ASSERT(newval != ZIO_CHECKSUM_INHERIT); | |
135 | ||
136 | os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); | |
137 | } | |
138 | ||
139 | static void | |
140 | compression_changed_cb(void *arg, uint64_t newval) | |
141 | { | |
142 | objset_t *os = arg; | |
143 | ||
144 | /* | |
145 | * Inheritance and range checking should have been done by now. | |
146 | */ | |
147 | ASSERT(newval != ZIO_COMPRESS_INHERIT); | |
148 | ||
149 | os->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE); | |
150 | } | |
151 | ||
152 | static void | |
153 | copies_changed_cb(void *arg, uint64_t newval) | |
154 | { | |
155 | objset_t *os = arg; | |
156 | ||
157 | /* | |
158 | * Inheritance and range checking should have been done by now. | |
159 | */ | |
160 | ASSERT(newval > 0); | |
161 | ASSERT(newval <= spa_max_replication(os->os_spa)); | |
162 | ||
163 | os->os_copies = newval; | |
164 | } | |
165 | ||
166 | static void | |
167 | dedup_changed_cb(void *arg, uint64_t newval) | |
168 | { | |
169 | objset_t *os = arg; | |
170 | spa_t *spa = os->os_spa; | |
171 | enum zio_checksum checksum; | |
172 | ||
173 | /* | |
174 | * Inheritance should have been done by now. | |
175 | */ | |
176 | ASSERT(newval != ZIO_CHECKSUM_INHERIT); | |
177 | ||
178 | checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF); | |
179 | ||
180 | os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK; | |
181 | os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY); | |
182 | } | |
183 | ||
184 | static void | |
185 | primary_cache_changed_cb(void *arg, uint64_t newval) | |
186 | { | |
187 | objset_t *os = arg; | |
188 | ||
189 | /* | |
190 | * Inheritance and range checking should have been done by now. | |
191 | */ | |
192 | ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || | |
193 | newval == ZFS_CACHE_METADATA); | |
194 | ||
195 | os->os_primary_cache = newval; | |
196 | } | |
197 | ||
198 | static void | |
199 | secondary_cache_changed_cb(void *arg, uint64_t newval) | |
200 | { | |
201 | objset_t *os = arg; | |
202 | ||
203 | /* | |
204 | * Inheritance and range checking should have been done by now. | |
205 | */ | |
206 | ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || | |
207 | newval == ZFS_CACHE_METADATA); | |
208 | ||
209 | os->os_secondary_cache = newval; | |
210 | } | |
211 | ||
212 | static void | |
213 | sync_changed_cb(void *arg, uint64_t newval) | |
214 | { | |
215 | objset_t *os = arg; | |
216 | ||
217 | /* | |
218 | * Inheritance and range checking should have been done by now. | |
219 | */ | |
220 | ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS || | |
221 | newval == ZFS_SYNC_DISABLED); | |
222 | ||
223 | os->os_sync = newval; | |
224 | if (os->os_zil) | |
225 | zil_set_sync(os->os_zil, newval); | |
226 | } | |
227 | ||
228 | static void | |
229 | logbias_changed_cb(void *arg, uint64_t newval) | |
230 | { | |
231 | objset_t *os = arg; | |
232 | ||
233 | ASSERT(newval == ZFS_LOGBIAS_LATENCY || | |
234 | newval == ZFS_LOGBIAS_THROUGHPUT); | |
235 | os->os_logbias = newval; | |
236 | if (os->os_zil) | |
237 | zil_set_logbias(os->os_zil, newval); | |
238 | } | |
239 | ||
240 | void | |
241 | dmu_objset_byteswap(void *buf, size_t size) | |
242 | { | |
243 | objset_phys_t *osp = buf; | |
244 | ||
245 | ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t)); | |
246 | dnode_byteswap(&osp->os_meta_dnode); | |
247 | byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t)); | |
248 | osp->os_type = BSWAP_64(osp->os_type); | |
249 | osp->os_flags = BSWAP_64(osp->os_flags); | |
250 | if (size == sizeof (objset_phys_t)) { | |
251 | dnode_byteswap(&osp->os_userused_dnode); | |
252 | dnode_byteswap(&osp->os_groupused_dnode); | |
253 | } | |
254 | } | |
255 | ||
256 | int | |
257 | dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, | |
258 | objset_t **osp) | |
259 | { | |
260 | objset_t *os; | |
261 | int i, err; | |
262 | ||
263 | ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); | |
264 | ||
265 | os = kmem_zalloc(sizeof (objset_t), KM_SLEEP); | |
266 | os->os_dsl_dataset = ds; | |
267 | os->os_spa = spa; | |
268 | os->os_rootbp = bp; | |
269 | if (!BP_IS_HOLE(os->os_rootbp)) { | |
270 | uint32_t aflags = ARC_WAIT; | |
271 | zbookmark_t zb; | |
272 | SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, | |
273 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
274 | ||
275 | if (DMU_OS_IS_L2CACHEABLE(os)) | |
276 | aflags |= ARC_L2CACHE; | |
277 | ||
278 | dprintf_bp(os->os_rootbp, "reading %s", ""); | |
279 | /* | |
280 | * XXX when bprewrite scrub can change the bp, | |
281 | * and this is called from dmu_objset_open_ds_os, the bp | |
282 | * could change, and we'll need a lock. | |
283 | */ | |
284 | err = dsl_read_nolock(NULL, spa, os->os_rootbp, | |
285 | arc_getbuf_func, &os->os_phys_buf, | |
286 | ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); | |
287 | if (err) { | |
288 | kmem_free(os, sizeof (objset_t)); | |
289 | /* convert checksum errors into IO errors */ | |
290 | if (err == ECKSUM) | |
291 | err = EIO; | |
292 | return (err); | |
293 | } | |
294 | ||
295 | /* Increase the blocksize if we are permitted. */ | |
296 | if (spa_version(spa) >= SPA_VERSION_USERSPACE && | |
297 | arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) { | |
298 | arc_buf_t *buf = arc_buf_alloc(spa, | |
299 | sizeof (objset_phys_t), &os->os_phys_buf, | |
300 | ARC_BUFC_METADATA); | |
301 | bzero(buf->b_data, sizeof (objset_phys_t)); | |
302 | bcopy(os->os_phys_buf->b_data, buf->b_data, | |
303 | arc_buf_size(os->os_phys_buf)); | |
304 | (void) arc_buf_remove_ref(os->os_phys_buf, | |
305 | &os->os_phys_buf); | |
306 | os->os_phys_buf = buf; | |
307 | } | |
308 | ||
309 | os->os_phys = os->os_phys_buf->b_data; | |
310 | os->os_flags = os->os_phys->os_flags; | |
311 | } else { | |
312 | int size = spa_version(spa) >= SPA_VERSION_USERSPACE ? | |
313 | sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE; | |
314 | os->os_phys_buf = arc_buf_alloc(spa, size, | |
315 | &os->os_phys_buf, ARC_BUFC_METADATA); | |
316 | os->os_phys = os->os_phys_buf->b_data; | |
317 | bzero(os->os_phys, size); | |
318 | } | |
319 | ||
320 | /* | |
321 | * Note: the changed_cb will be called once before the register | |
322 | * func returns, thus changing the checksum/compression from the | |
323 | * default (fletcher2/off). Snapshots don't need to know about | |
324 | * checksum/compression/copies. | |
325 | */ | |
326 | if (ds) { | |
327 | err = dsl_prop_register(ds, "primarycache", | |
328 | primary_cache_changed_cb, os); | |
329 | if (err == 0) | |
330 | err = dsl_prop_register(ds, "secondarycache", | |
331 | secondary_cache_changed_cb, os); | |
332 | if (!dsl_dataset_is_snapshot(ds)) { | |
333 | if (err == 0) | |
334 | err = dsl_prop_register(ds, "checksum", | |
335 | checksum_changed_cb, os); | |
336 | if (err == 0) | |
337 | err = dsl_prop_register(ds, "compression", | |
338 | compression_changed_cb, os); | |
339 | if (err == 0) | |
340 | err = dsl_prop_register(ds, "copies", | |
341 | copies_changed_cb, os); | |
342 | if (err == 0) | |
343 | err = dsl_prop_register(ds, "dedup", | |
344 | dedup_changed_cb, os); | |
345 | if (err == 0) | |
346 | err = dsl_prop_register(ds, "logbias", | |
347 | logbias_changed_cb, os); | |
348 | if (err == 0) | |
349 | err = dsl_prop_register(ds, "sync", | |
350 | sync_changed_cb, os); | |
351 | } | |
352 | if (err) { | |
353 | VERIFY(arc_buf_remove_ref(os->os_phys_buf, | |
354 | &os->os_phys_buf) == 1); | |
355 | kmem_free(os, sizeof (objset_t)); | |
356 | return (err); | |
357 | } | |
358 | } else if (ds == NULL) { | |
359 | /* It's the meta-objset. */ | |
360 | os->os_checksum = ZIO_CHECKSUM_FLETCHER_4; | |
361 | os->os_compress = ZIO_COMPRESS_LZJB; | |
362 | os->os_copies = spa_max_replication(spa); | |
363 | os->os_dedup_checksum = ZIO_CHECKSUM_OFF; | |
364 | os->os_dedup_verify = 0; | |
365 | os->os_logbias = 0; | |
366 | os->os_sync = 0; | |
367 | os->os_primary_cache = ZFS_CACHE_ALL; | |
368 | os->os_secondary_cache = ZFS_CACHE_ALL; | |
369 | } | |
370 | ||
371 | if (ds == NULL || !dsl_dataset_is_snapshot(ds)) | |
372 | os->os_zil_header = os->os_phys->os_zil_header; | |
373 | os->os_zil = zil_alloc(os, &os->os_zil_header); | |
374 | ||
375 | for (i = 0; i < TXG_SIZE; i++) { | |
376 | list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t), | |
377 | offsetof(dnode_t, dn_dirty_link[i])); | |
378 | list_create(&os->os_free_dnodes[i], sizeof (dnode_t), | |
379 | offsetof(dnode_t, dn_dirty_link[i])); | |
380 | } | |
381 | list_create(&os->os_dnodes, sizeof (dnode_t), | |
382 | offsetof(dnode_t, dn_link)); | |
383 | list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), | |
384 | offsetof(dmu_buf_impl_t, db_link)); | |
385 | ||
386 | mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL); | |
387 | mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); | |
388 | mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); | |
389 | ||
390 | DMU_META_DNODE(os) = dnode_special_open(os, | |
391 | &os->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT, | |
392 | &os->os_meta_dnode); | |
393 | if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) { | |
394 | DMU_USERUSED_DNODE(os) = dnode_special_open(os, | |
395 | &os->os_phys->os_userused_dnode, DMU_USERUSED_OBJECT, | |
396 | &os->os_userused_dnode); | |
397 | DMU_GROUPUSED_DNODE(os) = dnode_special_open(os, | |
398 | &os->os_phys->os_groupused_dnode, DMU_GROUPUSED_OBJECT, | |
399 | &os->os_groupused_dnode); | |
400 | } | |
401 | ||
402 | /* | |
403 | * We should be the only thread trying to do this because we | |
404 | * have ds_opening_lock | |
405 | */ | |
406 | if (ds) { | |
407 | mutex_enter(&ds->ds_lock); | |
408 | ASSERT(ds->ds_objset == NULL); | |
409 | ds->ds_objset = os; | |
410 | mutex_exit(&ds->ds_lock); | |
411 | } | |
412 | ||
413 | *osp = os; | |
414 | return (0); | |
415 | } | |
416 | ||
417 | int | |
418 | dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp) | |
419 | { | |
420 | int err = 0; | |
421 | ||
422 | mutex_enter(&ds->ds_opening_lock); | |
423 | *osp = ds->ds_objset; | |
424 | if (*osp == NULL) { | |
425 | err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), | |
426 | ds, dsl_dataset_get_blkptr(ds), osp); | |
427 | } | |
428 | mutex_exit(&ds->ds_opening_lock); | |
429 | return (err); | |
430 | } | |
431 | ||
432 | /* called from zpl */ | |
433 | int | |
434 | dmu_objset_hold(const char *name, void *tag, objset_t **osp) | |
435 | { | |
436 | dsl_dataset_t *ds; | |
437 | int err; | |
438 | ||
439 | err = dsl_dataset_hold(name, tag, &ds); | |
440 | if (err) | |
441 | return (err); | |
442 | ||
443 | err = dmu_objset_from_ds(ds, osp); | |
444 | if (err) | |
445 | dsl_dataset_rele(ds, tag); | |
446 | ||
447 | return (err); | |
448 | } | |
449 | ||
450 | /* called from zpl */ | |
451 | int | |
452 | dmu_objset_own(const char *name, dmu_objset_type_t type, | |
453 | boolean_t readonly, void *tag, objset_t **osp) | |
454 | { | |
455 | dsl_dataset_t *ds; | |
456 | int err; | |
457 | ||
458 | err = dsl_dataset_own(name, B_FALSE, tag, &ds); | |
459 | if (err) | |
460 | return (err); | |
461 | ||
462 | err = dmu_objset_from_ds(ds, osp); | |
463 | if (err) { | |
464 | dsl_dataset_disown(ds, tag); | |
465 | } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) { | |
466 | dmu_objset_disown(*osp, tag); | |
467 | return (EINVAL); | |
468 | } else if (!readonly && dsl_dataset_is_snapshot(ds)) { | |
469 | dmu_objset_disown(*osp, tag); | |
470 | return (EROFS); | |
471 | } | |
472 | return (err); | |
473 | } | |
474 | ||
475 | void | |
476 | dmu_objset_rele(objset_t *os, void *tag) | |
477 | { | |
478 | dsl_dataset_rele(os->os_dsl_dataset, tag); | |
479 | } | |
480 | ||
481 | void | |
482 | dmu_objset_disown(objset_t *os, void *tag) | |
483 | { | |
484 | dsl_dataset_disown(os->os_dsl_dataset, tag); | |
485 | } | |
486 | ||
487 | int | |
488 | dmu_objset_evict_dbufs(objset_t *os) | |
489 | { | |
490 | dnode_t *dn; | |
491 | ||
492 | mutex_enter(&os->os_lock); | |
493 | ||
494 | /* process the mdn last, since the other dnodes have holds on it */ | |
495 | list_remove(&os->os_dnodes, DMU_META_DNODE(os)); | |
496 | list_insert_tail(&os->os_dnodes, DMU_META_DNODE(os)); | |
497 | ||
498 | /* | |
499 | * Find the first dnode with holds. We have to do this dance | |
500 | * because dnode_add_ref() only works if you already have a | |
501 | * hold. If there are no holds then it has no dbufs so OK to | |
502 | * skip. | |
503 | */ | |
504 | for (dn = list_head(&os->os_dnodes); | |
505 | dn && !dnode_add_ref(dn, FTAG); | |
506 | dn = list_next(&os->os_dnodes, dn)) | |
507 | continue; | |
508 | ||
509 | while (dn) { | |
510 | dnode_t *next_dn = dn; | |
511 | ||
512 | do { | |
513 | next_dn = list_next(&os->os_dnodes, next_dn); | |
514 | } while (next_dn && !dnode_add_ref(next_dn, FTAG)); | |
515 | ||
516 | mutex_exit(&os->os_lock); | |
517 | dnode_evict_dbufs(dn); | |
518 | dnode_rele(dn, FTAG); | |
519 | mutex_enter(&os->os_lock); | |
520 | dn = next_dn; | |
521 | } | |
522 | dn = list_head(&os->os_dnodes); | |
523 | mutex_exit(&os->os_lock); | |
524 | return (dn != DMU_META_DNODE(os)); | |
525 | } | |
526 | ||
527 | void | |
528 | dmu_objset_evict(objset_t *os) | |
529 | { | |
530 | dsl_dataset_t *ds = os->os_dsl_dataset; | |
531 | ||
532 | for (int t = 0; t < TXG_SIZE; t++) | |
533 | ASSERT(!dmu_objset_is_dirty(os, t)); | |
534 | ||
535 | if (ds) { | |
536 | if (!dsl_dataset_is_snapshot(ds)) { | |
537 | VERIFY(0 == dsl_prop_unregister(ds, "checksum", | |
538 | checksum_changed_cb, os)); | |
539 | VERIFY(0 == dsl_prop_unregister(ds, "compression", | |
540 | compression_changed_cb, os)); | |
541 | VERIFY(0 == dsl_prop_unregister(ds, "copies", | |
542 | copies_changed_cb, os)); | |
543 | VERIFY(0 == dsl_prop_unregister(ds, "dedup", | |
544 | dedup_changed_cb, os)); | |
545 | VERIFY(0 == dsl_prop_unregister(ds, "logbias", | |
546 | logbias_changed_cb, os)); | |
547 | VERIFY(0 == dsl_prop_unregister(ds, "sync", | |
548 | sync_changed_cb, os)); | |
549 | } | |
550 | VERIFY(0 == dsl_prop_unregister(ds, "primarycache", | |
551 | primary_cache_changed_cb, os)); | |
552 | VERIFY(0 == dsl_prop_unregister(ds, "secondarycache", | |
553 | secondary_cache_changed_cb, os)); | |
554 | } | |
555 | ||
556 | if (os->os_sa) | |
557 | sa_tear_down(os); | |
558 | ||
559 | /* | |
560 | * We should need only a single pass over the dnode list, since | |
561 | * nothing can be added to the list at this point. | |
562 | */ | |
563 | (void) dmu_objset_evict_dbufs(os); | |
564 | ||
565 | dnode_special_close(&os->os_meta_dnode); | |
566 | if (DMU_USERUSED_DNODE(os)) { | |
567 | dnode_special_close(&os->os_userused_dnode); | |
568 | dnode_special_close(&os->os_groupused_dnode); | |
569 | } | |
570 | zil_free(os->os_zil); | |
571 | ||
572 | ASSERT3P(list_head(&os->os_dnodes), ==, NULL); | |
573 | ||
574 | VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf) == 1); | |
575 | ||
576 | /* | |
577 | * This is a barrier to prevent the objset from going away in | |
578 | * dnode_move() until we can safely ensure that the objset is still in | |
579 | * use. We consider the objset valid before the barrier and invalid | |
580 | * after the barrier. | |
581 | */ | |
582 | rw_enter(&os_lock, RW_READER); | |
583 | rw_exit(&os_lock); | |
584 | ||
585 | mutex_destroy(&os->os_lock); | |
586 | mutex_destroy(&os->os_obj_lock); | |
587 | mutex_destroy(&os->os_user_ptr_lock); | |
588 | kmem_free(os, sizeof (objset_t)); | |
589 | } | |
590 | ||
591 | timestruc_t | |
592 | dmu_objset_snap_cmtime(objset_t *os) | |
593 | { | |
594 | return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir)); | |
595 | } | |
596 | ||
597 | /* called from dsl for meta-objset */ | |
598 | objset_t * | |
599 | dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, | |
600 | dmu_objset_type_t type, dmu_tx_t *tx) | |
601 | { | |
602 | objset_t *os; | |
603 | dnode_t *mdn; | |
604 | ||
605 | ASSERT(dmu_tx_is_syncing(tx)); | |
606 | if (ds != NULL) | |
607 | VERIFY(0 == dmu_objset_from_ds(ds, &os)); | |
608 | else | |
609 | VERIFY(0 == dmu_objset_open_impl(spa, NULL, bp, &os)); | |
610 | ||
611 | mdn = DMU_META_DNODE(os); | |
612 | ||
613 | dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, | |
614 | DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); | |
615 | ||
616 | /* | |
617 | * We don't want to have to increase the meta-dnode's nlevels | |
618 | * later, because then we could do it in quescing context while | |
619 | * we are also accessing it in open context. | |
620 | * | |
621 | * This precaution is not necessary for the MOS (ds == NULL), | |
622 | * because the MOS is only updated in syncing context. | |
623 | * This is most fortunate: the MOS is the only objset that | |
624 | * needs to be synced multiple times as spa_sync() iterates | |
625 | * to convergence, so minimizing its dn_nlevels matters. | |
626 | */ | |
627 | if (ds != NULL) { | |
628 | int levels = 1; | |
629 | ||
630 | /* | |
631 | * Determine the number of levels necessary for the meta-dnode | |
632 | * to contain DN_MAX_OBJECT dnodes. | |
633 | */ | |
634 | while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + | |
635 | (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < | |
636 | DN_MAX_OBJECT * sizeof (dnode_phys_t)) | |
637 | levels++; | |
638 | ||
639 | mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = | |
640 | mdn->dn_nlevels = levels; | |
641 | } | |
642 | ||
643 | ASSERT(type != DMU_OST_NONE); | |
644 | ASSERT(type != DMU_OST_ANY); | |
645 | ASSERT(type < DMU_OST_NUMTYPES); | |
646 | os->os_phys->os_type = type; | |
647 | if (dmu_objset_userused_enabled(os)) { | |
648 | os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; | |
649 | os->os_flags = os->os_phys->os_flags; | |
650 | } | |
651 | ||
652 | dsl_dataset_dirty(ds, tx); | |
653 | ||
654 | return (os); | |
655 | } | |
656 | ||
657 | struct oscarg { | |
658 | void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx); | |
659 | void *userarg; | |
660 | dsl_dataset_t *clone_origin; | |
661 | const char *lastname; | |
662 | dmu_objset_type_t type; | |
663 | uint64_t flags; | |
664 | cred_t *cr; | |
665 | }; | |
666 | ||
667 | /*ARGSUSED*/ | |
668 | static int | |
669 | dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
670 | { | |
671 | dsl_dir_t *dd = arg1; | |
672 | struct oscarg *oa = arg2; | |
673 | objset_t *mos = dd->dd_pool->dp_meta_objset; | |
674 | int err; | |
675 | uint64_t ddobj; | |
676 | ||
677 | err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, | |
678 | oa->lastname, sizeof (uint64_t), 1, &ddobj); | |
679 | if (err != ENOENT) | |
680 | return (err ? err : EEXIST); | |
681 | ||
682 | if (oa->clone_origin != NULL) { | |
683 | /* You can't clone across pools. */ | |
684 | if (oa->clone_origin->ds_dir->dd_pool != dd->dd_pool) | |
685 | return (EXDEV); | |
686 | ||
687 | /* You can only clone snapshots, not the head datasets. */ | |
688 | if (!dsl_dataset_is_snapshot(oa->clone_origin)) | |
689 | return (EINVAL); | |
690 | } | |
691 | ||
692 | return (0); | |
693 | } | |
694 | ||
695 | static void | |
696 | dmu_objset_create_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
697 | { | |
698 | dsl_dir_t *dd = arg1; | |
699 | spa_t *spa = dd->dd_pool->dp_spa; | |
700 | struct oscarg *oa = arg2; | |
701 | uint64_t obj; | |
702 | ||
703 | ASSERT(dmu_tx_is_syncing(tx)); | |
704 | ||
705 | obj = dsl_dataset_create_sync(dd, oa->lastname, | |
706 | oa->clone_origin, oa->flags, oa->cr, tx); | |
707 | ||
708 | if (oa->clone_origin == NULL) { | |
709 | dsl_pool_t *dp = dd->dd_pool; | |
710 | dsl_dataset_t *ds; | |
711 | blkptr_t *bp; | |
712 | objset_t *os; | |
713 | ||
714 | VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, obj, FTAG, &ds)); | |
715 | bp = dsl_dataset_get_blkptr(ds); | |
716 | ASSERT(BP_IS_HOLE(bp)); | |
717 | ||
718 | os = dmu_objset_create_impl(spa, ds, bp, oa->type, tx); | |
719 | ||
720 | if (oa->userfunc) | |
721 | oa->userfunc(os, oa->userarg, oa->cr, tx); | |
722 | dsl_dataset_rele(ds, FTAG); | |
723 | } | |
724 | ||
725 | spa_history_log_internal(LOG_DS_CREATE, spa, tx, "dataset = %llu", obj); | |
726 | } | |
727 | ||
728 | int | |
729 | dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, | |
730 | void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) | |
731 | { | |
732 | dsl_dir_t *pdd; | |
733 | const char *tail; | |
734 | int err = 0; | |
735 | struct oscarg oa = { 0 }; | |
736 | ||
737 | ASSERT(strchr(name, '@') == NULL); | |
738 | err = dsl_dir_open(name, FTAG, &pdd, &tail); | |
739 | if (err) | |
740 | return (err); | |
741 | if (tail == NULL) { | |
742 | dsl_dir_close(pdd, FTAG); | |
743 | return (EEXIST); | |
744 | } | |
745 | ||
746 | oa.userfunc = func; | |
747 | oa.userarg = arg; | |
748 | oa.lastname = tail; | |
749 | oa.type = type; | |
750 | oa.flags = flags; | |
751 | oa.cr = CRED(); | |
752 | ||
753 | err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, | |
754 | dmu_objset_create_sync, pdd, &oa, 5); | |
755 | dsl_dir_close(pdd, FTAG); | |
756 | return (err); | |
757 | } | |
758 | ||
759 | int | |
760 | dmu_objset_clone(const char *name, dsl_dataset_t *clone_origin, uint64_t flags) | |
761 | { | |
762 | dsl_dir_t *pdd; | |
763 | const char *tail; | |
764 | int err = 0; | |
765 | struct oscarg oa = { 0 }; | |
766 | ||
767 | ASSERT(strchr(name, '@') == NULL); | |
768 | err = dsl_dir_open(name, FTAG, &pdd, &tail); | |
769 | if (err) | |
770 | return (err); | |
771 | if (tail == NULL) { | |
772 | dsl_dir_close(pdd, FTAG); | |
773 | return (EEXIST); | |
774 | } | |
775 | ||
776 | oa.lastname = tail; | |
777 | oa.clone_origin = clone_origin; | |
778 | oa.flags = flags; | |
779 | oa.cr = CRED(); | |
780 | ||
781 | err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, | |
782 | dmu_objset_create_sync, pdd, &oa, 5); | |
783 | dsl_dir_close(pdd, FTAG); | |
784 | return (err); | |
785 | } | |
786 | ||
787 | int | |
788 | dmu_objset_destroy(const char *name, boolean_t defer) | |
789 | { | |
790 | dsl_dataset_t *ds; | |
791 | int error; | |
792 | ||
793 | error = dsl_dataset_own(name, B_TRUE, FTAG, &ds); | |
794 | if (error == 0) { | |
795 | error = dsl_dataset_destroy(ds, FTAG, defer); | |
796 | /* dsl_dataset_destroy() closes the ds. */ | |
797 | } | |
798 | ||
799 | return (error); | |
800 | } | |
801 | ||
802 | struct snaparg { | |
803 | dsl_sync_task_group_t *dstg; | |
804 | char *snapname; | |
805 | char *htag; | |
806 | char failed[MAXPATHLEN]; | |
807 | boolean_t recursive; | |
808 | boolean_t needsuspend; | |
809 | boolean_t temporary; | |
810 | nvlist_t *props; | |
811 | struct dsl_ds_holdarg *ha; /* only needed in the temporary case */ | |
812 | dsl_dataset_t *newds; | |
813 | }; | |
814 | ||
815 | static int | |
816 | snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
817 | { | |
818 | objset_t *os = arg1; | |
819 | struct snaparg *sn = arg2; | |
820 | int error; | |
821 | ||
822 | /* The props have already been checked by zfs_check_userprops(). */ | |
823 | ||
824 | error = dsl_dataset_snapshot_check(os->os_dsl_dataset, | |
825 | sn->snapname, tx); | |
826 | if (error) | |
827 | return (error); | |
828 | ||
829 | if (sn->temporary) { | |
830 | /* | |
831 | * Ideally we would just call | |
832 | * dsl_dataset_user_hold_check() and | |
833 | * dsl_dataset_destroy_check() here. However the | |
834 | * dataset we want to hold and destroy is the snapshot | |
835 | * that we just confirmed we can create, but it won't | |
836 | * exist until after these checks are run. Do any | |
837 | * checks we can here and if more checks are added to | |
838 | * those routines in the future, similar checks may be | |
839 | * necessary here. | |
840 | */ | |
841 | if (spa_version(os->os_spa) < SPA_VERSION_USERREFS) | |
842 | return (ENOTSUP); | |
843 | /* | |
844 | * Not checking number of tags because the tag will be | |
845 | * unique, as it will be the only tag. | |
846 | */ | |
847 | if (strlen(sn->htag) + MAX_TAG_PREFIX_LEN >= MAXNAMELEN) | |
848 | return (E2BIG); | |
849 | ||
850 | sn->ha = kmem_alloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP); | |
851 | sn->ha->temphold = B_TRUE; | |
852 | sn->ha->htag = sn->htag; | |
853 | } | |
854 | return (error); | |
855 | } | |
856 | ||
857 | static void | |
858 | snapshot_sync(void *arg1, void *arg2, dmu_tx_t *tx) | |
859 | { | |
860 | objset_t *os = arg1; | |
861 | dsl_dataset_t *ds = os->os_dsl_dataset; | |
862 | struct snaparg *sn = arg2; | |
863 | ||
864 | dsl_dataset_snapshot_sync(ds, sn->snapname, tx); | |
865 | ||
866 | if (sn->props) { | |
867 | dsl_props_arg_t pa; | |
868 | pa.pa_props = sn->props; | |
869 | pa.pa_source = ZPROP_SRC_LOCAL; | |
870 | dsl_props_set_sync(ds->ds_prev, &pa, tx); | |
871 | } | |
872 | ||
873 | if (sn->temporary) { | |
874 | struct dsl_ds_destroyarg da; | |
875 | ||
876 | dsl_dataset_user_hold_sync(ds->ds_prev, sn->ha, tx); | |
877 | kmem_free(sn->ha, sizeof (struct dsl_ds_holdarg)); | |
878 | sn->ha = NULL; | |
879 | sn->newds = ds->ds_prev; | |
880 | ||
881 | da.ds = ds->ds_prev; | |
882 | da.defer = B_TRUE; | |
883 | dsl_dataset_destroy_sync(&da, FTAG, tx); | |
884 | } | |
885 | } | |
886 | ||
887 | static int | |
888 | dmu_objset_snapshot_one(const char *name, void *arg) | |
889 | { | |
890 | struct snaparg *sn = arg; | |
891 | objset_t *os; | |
892 | int err; | |
893 | char *cp; | |
894 | ||
895 | /* | |
896 | * If the objset starts with a '%', then ignore it unless it was | |
897 | * explicitly named (ie, not recursive). These hidden datasets | |
898 | * are always inconsistent, and by not opening them here, we can | |
899 | * avoid a race with dsl_dir_destroy_check(). | |
900 | */ | |
901 | cp = strrchr(name, '/'); | |
902 | if (cp && cp[1] == '%' && sn->recursive) | |
903 | return (0); | |
904 | ||
905 | (void) strcpy(sn->failed, name); | |
906 | ||
907 | /* | |
908 | * Check permissions if we are doing a recursive snapshot. The | |
909 | * permission checks for the starting dataset have already been | |
910 | * performed in zfs_secpolicy_snapshot() | |
911 | */ | |
912 | if (sn->recursive && (err = zfs_secpolicy_snapshot_perms(name, CRED()))) | |
913 | return (err); | |
914 | ||
915 | err = dmu_objset_hold(name, sn, &os); | |
916 | if (err != 0) | |
917 | return (err); | |
918 | ||
919 | /* | |
920 | * If the objset is in an inconsistent state (eg, in the process | |
921 | * of being destroyed), don't snapshot it. As with %hidden | |
922 | * datasets, we return EBUSY if this name was explicitly | |
923 | * requested (ie, not recursive), and otherwise ignore it. | |
924 | */ | |
925 | if (os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) { | |
926 | dmu_objset_rele(os, sn); | |
927 | return (sn->recursive ? 0 : EBUSY); | |
928 | } | |
929 | ||
930 | if (sn->needsuspend) { | |
931 | err = zil_suspend(dmu_objset_zil(os)); | |
932 | if (err) { | |
933 | dmu_objset_rele(os, sn); | |
934 | return (err); | |
935 | } | |
936 | } | |
937 | dsl_sync_task_create(sn->dstg, snapshot_check, snapshot_sync, | |
938 | os, sn, 3); | |
939 | ||
940 | return (0); | |
941 | } | |
942 | ||
943 | int | |
944 | dmu_objset_snapshot(char *fsname, char *snapname, char *tag, | |
945 | nvlist_t *props, boolean_t recursive, boolean_t temporary, int cleanup_fd) | |
946 | { | |
947 | dsl_sync_task_t *dst; | |
948 | struct snaparg sn; | |
949 | spa_t *spa; | |
950 | minor_t minor; | |
951 | int err; | |
952 | ||
953 | (void) strcpy(sn.failed, fsname); | |
954 | ||
955 | err = spa_open(fsname, &spa, FTAG); | |
956 | if (err) | |
957 | return (err); | |
958 | ||
959 | if (temporary) { | |
960 | if (cleanup_fd < 0) { | |
961 | spa_close(spa, FTAG); | |
962 | return (EINVAL); | |
963 | } | |
964 | if ((err = zfs_onexit_fd_hold(cleanup_fd, &minor)) != 0) { | |
965 | spa_close(spa, FTAG); | |
966 | return (err); | |
967 | } | |
968 | } | |
969 | ||
970 | sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); | |
971 | sn.snapname = snapname; | |
972 | sn.htag = tag; | |
973 | sn.props = props; | |
974 | sn.recursive = recursive; | |
975 | sn.needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); | |
976 | sn.temporary = temporary; | |
977 | sn.ha = NULL; | |
978 | sn.newds = NULL; | |
979 | ||
980 | if (recursive) { | |
981 | err = dmu_objset_find(fsname, | |
982 | dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN); | |
983 | } else { | |
984 | err = dmu_objset_snapshot_one(fsname, &sn); | |
985 | } | |
986 | ||
987 | if (err == 0) | |
988 | err = dsl_sync_task_group_wait(sn.dstg); | |
989 | ||
990 | for (dst = list_head(&sn.dstg->dstg_tasks); dst; | |
991 | dst = list_next(&sn.dstg->dstg_tasks, dst)) { | |
992 | objset_t *os = dst->dst_arg1; | |
993 | dsl_dataset_t *ds = os->os_dsl_dataset; | |
994 | if (dst->dst_err) { | |
995 | dsl_dataset_name(ds, sn.failed); | |
996 | } else if (temporary) { | |
997 | dsl_register_onexit_hold_cleanup(sn.newds, tag, minor); | |
998 | } | |
999 | if (sn.needsuspend) | |
1000 | zil_resume(dmu_objset_zil(os)); | |
1001 | dmu_objset_rele(os, &sn); | |
1002 | } | |
1003 | ||
1004 | if (err) | |
1005 | (void) strcpy(fsname, sn.failed); | |
1006 | if (temporary) | |
1007 | zfs_onexit_fd_rele(cleanup_fd); | |
1008 | dsl_sync_task_group_destroy(sn.dstg); | |
1009 | spa_close(spa, FTAG); | |
1010 | return (err); | |
1011 | } | |
1012 | ||
1013 | static void | |
1014 | dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx) | |
1015 | { | |
1016 | dnode_t *dn; | |
1017 | ||
1018 | while (dn = list_head(list)) { | |
1019 | ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); | |
1020 | ASSERT(dn->dn_dbuf->db_data_pending); | |
1021 | /* | |
1022 | * Initialize dn_zio outside dnode_sync() because the | |
1023 | * meta-dnode needs to set it ouside dnode_sync(). | |
1024 | */ | |
1025 | dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; | |
1026 | ASSERT(dn->dn_zio); | |
1027 | ||
1028 | ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); | |
1029 | list_remove(list, dn); | |
1030 | ||
1031 | if (newlist) { | |
1032 | (void) dnode_add_ref(dn, newlist); | |
1033 | list_insert_tail(newlist, dn); | |
1034 | } | |
1035 | ||
1036 | dnode_sync(dn, tx); | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | /* ARGSUSED */ | |
1041 | static void | |
1042 | dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg) | |
1043 | { | |
1044 | blkptr_t *bp = zio->io_bp; | |
1045 | objset_t *os = arg; | |
1046 | dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; | |
1047 | ||
1048 | ASSERT(bp == os->os_rootbp); | |
1049 | ASSERT(BP_GET_TYPE(bp) == DMU_OT_OBJSET); | |
1050 | ASSERT(BP_GET_LEVEL(bp) == 0); | |
1051 | ||
1052 | /* | |
1053 | * Update rootbp fill count: it should be the number of objects | |
1054 | * allocated in the object set (not counting the "special" | |
1055 | * objects that are stored in the objset_phys_t -- the meta | |
1056 | * dnode and user/group accounting objects). | |
1057 | */ | |
1058 | bp->blk_fill = 0; | |
1059 | for (int i = 0; i < dnp->dn_nblkptr; i++) | |
1060 | bp->blk_fill += dnp->dn_blkptr[i].blk_fill; | |
1061 | } | |
1062 | ||
1063 | /* ARGSUSED */ | |
1064 | static void | |
1065 | dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg) | |
1066 | { | |
1067 | blkptr_t *bp = zio->io_bp; | |
1068 | blkptr_t *bp_orig = &zio->io_bp_orig; | |
1069 | objset_t *os = arg; | |
1070 | ||
1071 | if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { | |
1072 | ASSERT(BP_EQUAL(bp, bp_orig)); | |
1073 | } else { | |
1074 | dsl_dataset_t *ds = os->os_dsl_dataset; | |
1075 | dmu_tx_t *tx = os->os_synctx; | |
1076 | ||
1077 | (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); | |
1078 | dsl_dataset_block_born(ds, bp, tx); | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | /* called from dsl */ | |
1083 | void | |
1084 | dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx) | |
1085 | { | |
1086 | int txgoff; | |
1087 | zbookmark_t zb; | |
1088 | zio_prop_t zp; | |
1089 | zio_t *zio; | |
1090 | list_t *list; | |
1091 | list_t *newlist = NULL; | |
1092 | dbuf_dirty_record_t *dr; | |
1093 | ||
1094 | dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); | |
1095 | ||
1096 | ASSERT(dmu_tx_is_syncing(tx)); | |
1097 | /* XXX the write_done callback should really give us the tx... */ | |
1098 | os->os_synctx = tx; | |
1099 | ||
1100 | if (os->os_dsl_dataset == NULL) { | |
1101 | /* | |
1102 | * This is the MOS. If we have upgraded, | |
1103 | * spa_max_replication() could change, so reset | |
1104 | * os_copies here. | |
1105 | */ | |
1106 | os->os_copies = spa_max_replication(os->os_spa); | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * Create the root block IO | |
1111 | */ | |
1112 | SET_BOOKMARK(&zb, os->os_dsl_dataset ? | |
1113 | os->os_dsl_dataset->ds_object : DMU_META_OBJSET, | |
1114 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
1115 | VERIFY3U(0, ==, arc_release_bp(os->os_phys_buf, &os->os_phys_buf, | |
1116 | os->os_rootbp, os->os_spa, &zb)); | |
1117 | ||
1118 | dmu_write_policy(os, NULL, 0, 0, &zp); | |
1119 | ||
1120 | zio = arc_write(pio, os->os_spa, tx->tx_txg, | |
1121 | os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), &zp, | |
1122 | dmu_objset_write_ready, dmu_objset_write_done, os, | |
1123 | ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); | |
1124 | ||
1125 | /* | |
1126 | * Sync special dnodes - the parent IO for the sync is the root block | |
1127 | */ | |
1128 | DMU_META_DNODE(os)->dn_zio = zio; | |
1129 | dnode_sync(DMU_META_DNODE(os), tx); | |
1130 | ||
1131 | os->os_phys->os_flags = os->os_flags; | |
1132 | ||
1133 | if (DMU_USERUSED_DNODE(os) && | |
1134 | DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) { | |
1135 | DMU_USERUSED_DNODE(os)->dn_zio = zio; | |
1136 | dnode_sync(DMU_USERUSED_DNODE(os), tx); | |
1137 | DMU_GROUPUSED_DNODE(os)->dn_zio = zio; | |
1138 | dnode_sync(DMU_GROUPUSED_DNODE(os), tx); | |
1139 | } | |
1140 | ||
1141 | txgoff = tx->tx_txg & TXG_MASK; | |
1142 | ||
1143 | if (dmu_objset_userused_enabled(os)) { | |
1144 | newlist = &os->os_synced_dnodes; | |
1145 | /* | |
1146 | * We must create the list here because it uses the | |
1147 | * dn_dirty_link[] of this txg. | |
1148 | */ | |
1149 | list_create(newlist, sizeof (dnode_t), | |
1150 | offsetof(dnode_t, dn_dirty_link[txgoff])); | |
1151 | } | |
1152 | ||
1153 | dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx); | |
1154 | dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx); | |
1155 | ||
1156 | list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff]; | |
1157 | while (dr = list_head(list)) { | |
1158 | ASSERT(dr->dr_dbuf->db_level == 0); | |
1159 | list_remove(list, dr); | |
1160 | if (dr->dr_zio) | |
1161 | zio_nowait(dr->dr_zio); | |
1162 | } | |
1163 | /* | |
1164 | * Free intent log blocks up to this tx. | |
1165 | */ | |
1166 | zil_sync(os->os_zil, tx); | |
1167 | os->os_phys->os_zil_header = os->os_zil_header; | |
1168 | zio_nowait(zio); | |
1169 | } | |
1170 | ||
1171 | boolean_t | |
1172 | dmu_objset_is_dirty(objset_t *os, uint64_t txg) | |
1173 | { | |
1174 | return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) || | |
1175 | !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK])); | |
1176 | } | |
1177 | ||
1178 | boolean_t | |
1179 | dmu_objset_is_dirty_anywhere(objset_t *os) | |
1180 | { | |
1181 | for (int t = 0; t < TXG_SIZE; t++) | |
1182 | if (dmu_objset_is_dirty(os, t)) | |
1183 | return (B_TRUE); | |
1184 | return (B_FALSE); | |
1185 | } | |
1186 | ||
1187 | static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES]; | |
1188 | ||
1189 | void | |
1190 | dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb) | |
1191 | { | |
1192 | used_cbs[ost] = cb; | |
1193 | } | |
1194 | ||
1195 | boolean_t | |
1196 | dmu_objset_userused_enabled(objset_t *os) | |
1197 | { | |
1198 | return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE && | |
1199 | used_cbs[os->os_phys->os_type] != NULL && | |
1200 | DMU_USERUSED_DNODE(os) != NULL); | |
1201 | } | |
1202 | ||
1203 | static void | |
1204 | do_userquota_update(objset_t *os, uint64_t used, uint64_t flags, | |
1205 | uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx) | |
1206 | { | |
1207 | if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) { | |
1208 | int64_t delta = DNODE_SIZE + used; | |
1209 | if (subtract) | |
1210 | delta = -delta; | |
1211 | VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT, | |
1212 | user, delta, tx)); | |
1213 | VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT, | |
1214 | group, delta, tx)); | |
1215 | } | |
1216 | } | |
1217 | ||
1218 | void | |
1219 | dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx) | |
1220 | { | |
1221 | dnode_t *dn; | |
1222 | list_t *list = &os->os_synced_dnodes; | |
1223 | ||
1224 | ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os)); | |
1225 | ||
1226 | while (dn = list_head(list)) { | |
1227 | int flags; | |
1228 | ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object)); | |
1229 | ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE || | |
1230 | dn->dn_phys->dn_flags & | |
1231 | DNODE_FLAG_USERUSED_ACCOUNTED); | |
1232 | ||
1233 | /* Allocate the user/groupused objects if necessary. */ | |
1234 | if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) { | |
1235 | VERIFY(0 == zap_create_claim(os, | |
1236 | DMU_USERUSED_OBJECT, | |
1237 | DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); | |
1238 | VERIFY(0 == zap_create_claim(os, | |
1239 | DMU_GROUPUSED_OBJECT, | |
1240 | DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); | |
1241 | } | |
1242 | ||
1243 | /* | |
1244 | * We intentionally modify the zap object even if the | |
1245 | * net delta is zero. Otherwise | |
1246 | * the block of the zap obj could be shared between | |
1247 | * datasets but need to be different between them after | |
1248 | * a bprewrite. | |
1249 | */ | |
1250 | ||
1251 | flags = dn->dn_id_flags; | |
1252 | ASSERT(flags); | |
1253 | if (flags & DN_ID_OLD_EXIST) { | |
1254 | do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags, | |
1255 | dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx); | |
1256 | } | |
1257 | if (flags & DN_ID_NEW_EXIST) { | |
1258 | do_userquota_update(os, DN_USED_BYTES(dn->dn_phys), | |
1259 | dn->dn_phys->dn_flags, dn->dn_newuid, | |
1260 | dn->dn_newgid, B_FALSE, tx); | |
1261 | } | |
1262 | ||
1263 | mutex_enter(&dn->dn_mtx); | |
1264 | dn->dn_oldused = 0; | |
1265 | dn->dn_oldflags = 0; | |
1266 | if (dn->dn_id_flags & DN_ID_NEW_EXIST) { | |
1267 | dn->dn_olduid = dn->dn_newuid; | |
1268 | dn->dn_oldgid = dn->dn_newgid; | |
1269 | dn->dn_id_flags |= DN_ID_OLD_EXIST; | |
1270 | if (dn->dn_bonuslen == 0) | |
1271 | dn->dn_id_flags |= DN_ID_CHKED_SPILL; | |
1272 | else | |
1273 | dn->dn_id_flags |= DN_ID_CHKED_BONUS; | |
1274 | } | |
1275 | dn->dn_id_flags &= ~(DN_ID_NEW_EXIST); | |
1276 | mutex_exit(&dn->dn_mtx); | |
1277 | ||
1278 | list_remove(list, dn); | |
1279 | dnode_rele(dn, list); | |
1280 | } | |
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * Returns a pointer to data to find uid/gid from | |
1285 | * | |
1286 | * If a dirty record for transaction group that is syncing can't | |
1287 | * be found then NULL is returned. In the NULL case it is assumed | |
1288 | * the uid/gid aren't changing. | |
1289 | */ | |
1290 | static void * | |
1291 | dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx) | |
1292 | { | |
1293 | dbuf_dirty_record_t *dr, **drp; | |
1294 | void *data; | |
1295 | ||
1296 | if (db->db_dirtycnt == 0) | |
1297 | return (db->db.db_data); /* Nothing is changing */ | |
1298 | ||
1299 | for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) | |
1300 | if (dr->dr_txg == tx->tx_txg) | |
1301 | break; | |
1302 | ||
1303 | if (dr == NULL) { | |
1304 | data = NULL; | |
1305 | } else { | |
1306 | dnode_t *dn; | |
1307 | ||
1308 | DB_DNODE_ENTER(dr->dr_dbuf); | |
1309 | dn = DB_DNODE(dr->dr_dbuf); | |
1310 | ||
1311 | if (dn->dn_bonuslen == 0 && | |
1312 | dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID) | |
1313 | data = dr->dt.dl.dr_data->b_data; | |
1314 | else | |
1315 | data = dr->dt.dl.dr_data; | |
1316 | ||
1317 | DB_DNODE_EXIT(dr->dr_dbuf); | |
1318 | } | |
1319 | ||
1320 | return (data); | |
1321 | } | |
1322 | ||
1323 | void | |
1324 | dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx) | |
1325 | { | |
1326 | objset_t *os = dn->dn_objset; | |
1327 | void *data = NULL; | |
1328 | dmu_buf_impl_t *db = NULL; | |
1329 | uint64_t *user, *group; | |
1330 | int flags = dn->dn_id_flags; | |
1331 | int error; | |
1332 | boolean_t have_spill = B_FALSE; | |
1333 | ||
1334 | if (!dmu_objset_userused_enabled(dn->dn_objset)) | |
1335 | return; | |
1336 | ||
1337 | if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST| | |
1338 | DN_ID_CHKED_SPILL))) | |
1339 | return; | |
1340 | ||
1341 | if (before && dn->dn_bonuslen != 0) | |
1342 | data = DN_BONUS(dn->dn_phys); | |
1343 | else if (!before && dn->dn_bonuslen != 0) { | |
1344 | if (dn->dn_bonus) { | |
1345 | db = dn->dn_bonus; | |
1346 | mutex_enter(&db->db_mtx); | |
1347 | data = dmu_objset_userquota_find_data(db, tx); | |
1348 | } else { | |
1349 | data = DN_BONUS(dn->dn_phys); | |
1350 | } | |
1351 | } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) { | |
1352 | int rf = 0; | |
1353 | ||
1354 | if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) | |
1355 | rf |= DB_RF_HAVESTRUCT; | |
1356 | error = dmu_spill_hold_by_dnode(dn, | |
1357 | rf | DB_RF_MUST_SUCCEED, | |
1358 | FTAG, (dmu_buf_t **)&db); | |
1359 | ASSERT(error == 0); | |
1360 | mutex_enter(&db->db_mtx); | |
1361 | data = (before) ? db->db.db_data : | |
1362 | dmu_objset_userquota_find_data(db, tx); | |
1363 | have_spill = B_TRUE; | |
1364 | } else { | |
1365 | mutex_enter(&dn->dn_mtx); | |
1366 | dn->dn_id_flags |= DN_ID_CHKED_BONUS; | |
1367 | mutex_exit(&dn->dn_mtx); | |
1368 | return; | |
1369 | } | |
1370 | ||
1371 | if (before) { | |
1372 | ASSERT(data); | |
1373 | user = &dn->dn_olduid; | |
1374 | group = &dn->dn_oldgid; | |
1375 | } else if (data) { | |
1376 | user = &dn->dn_newuid; | |
1377 | group = &dn->dn_newgid; | |
1378 | } | |
1379 | ||
1380 | /* | |
1381 | * Must always call the callback in case the object | |
1382 | * type has changed and that type isn't an object type to track | |
1383 | */ | |
1384 | error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data, | |
1385 | user, group); | |
1386 | ||
1387 | /* | |
1388 | * Preserve existing uid/gid when the callback can't determine | |
1389 | * what the new uid/gid are and the callback returned EEXIST. | |
1390 | * The EEXIST error tells us to just use the existing uid/gid. | |
1391 | * If we don't know what the old values are then just assign | |
1392 | * them to 0, since that is a new file being created. | |
1393 | */ | |
1394 | if (!before && data == NULL && error == EEXIST) { | |
1395 | if (flags & DN_ID_OLD_EXIST) { | |
1396 | dn->dn_newuid = dn->dn_olduid; | |
1397 | dn->dn_newgid = dn->dn_oldgid; | |
1398 | } else { | |
1399 | dn->dn_newuid = 0; | |
1400 | dn->dn_newgid = 0; | |
1401 | } | |
1402 | error = 0; | |
1403 | } | |
1404 | ||
1405 | if (db) | |
1406 | mutex_exit(&db->db_mtx); | |
1407 | ||
1408 | mutex_enter(&dn->dn_mtx); | |
1409 | if (error == 0 && before) | |
1410 | dn->dn_id_flags |= DN_ID_OLD_EXIST; | |
1411 | if (error == 0 && !before) | |
1412 | dn->dn_id_flags |= DN_ID_NEW_EXIST; | |
1413 | ||
1414 | if (have_spill) { | |
1415 | dn->dn_id_flags |= DN_ID_CHKED_SPILL; | |
1416 | } else { | |
1417 | dn->dn_id_flags |= DN_ID_CHKED_BONUS; | |
1418 | } | |
1419 | mutex_exit(&dn->dn_mtx); | |
1420 | if (have_spill) | |
1421 | dmu_buf_rele((dmu_buf_t *)db, FTAG); | |
1422 | } | |
1423 | ||
1424 | boolean_t | |
1425 | dmu_objset_userspace_present(objset_t *os) | |
1426 | { | |
1427 | return (os->os_phys->os_flags & | |
1428 | OBJSET_FLAG_USERACCOUNTING_COMPLETE); | |
1429 | } | |
1430 | ||
1431 | int | |
1432 | dmu_objset_userspace_upgrade(objset_t *os) | |
1433 | { | |
1434 | uint64_t obj; | |
1435 | int err = 0; | |
1436 | ||
1437 | if (dmu_objset_userspace_present(os)) | |
1438 | return (0); | |
1439 | if (!dmu_objset_userused_enabled(os)) | |
1440 | return (ENOTSUP); | |
1441 | if (dmu_objset_is_snapshot(os)) | |
1442 | return (EINVAL); | |
1443 | ||
1444 | /* | |
1445 | * We simply need to mark every object dirty, so that it will be | |
1446 | * synced out and now accounted. If this is called | |
1447 | * concurrently, or if we already did some work before crashing, | |
1448 | * that's fine, since we track each object's accounted state | |
1449 | * independently. | |
1450 | */ | |
1451 | ||
1452 | for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) { | |
1453 | dmu_tx_t *tx; | |
1454 | dmu_buf_t *db; | |
1455 | int objerr; | |
1456 | ||
1457 | if (issig(JUSTLOOKING) && issig(FORREAL)) | |
1458 | return (EINTR); | |
1459 | ||
1460 | objerr = dmu_bonus_hold(os, obj, FTAG, &db); | |
1461 | if (objerr) | |
1462 | continue; | |
1463 | tx = dmu_tx_create(os); | |
1464 | dmu_tx_hold_bonus(tx, obj); | |
1465 | objerr = dmu_tx_assign(tx, TXG_WAIT); | |
1466 | if (objerr) { | |
1467 | dmu_tx_abort(tx); | |
1468 | continue; | |
1469 | } | |
1470 | dmu_buf_will_dirty(db, tx); | |
1471 | dmu_buf_rele(db, FTAG); | |
1472 | dmu_tx_commit(tx); | |
1473 | } | |
1474 | ||
1475 | os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; | |
1476 | txg_wait_synced(dmu_objset_pool(os), 0); | |
1477 | return (0); | |
1478 | } | |
1479 | ||
1480 | void | |
1481 | dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, | |
1482 | uint64_t *usedobjsp, uint64_t *availobjsp) | |
1483 | { | |
1484 | dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp, | |
1485 | usedobjsp, availobjsp); | |
1486 | } | |
1487 | ||
1488 | uint64_t | |
1489 | dmu_objset_fsid_guid(objset_t *os) | |
1490 | { | |
1491 | return (dsl_dataset_fsid_guid(os->os_dsl_dataset)); | |
1492 | } | |
1493 | ||
1494 | void | |
1495 | dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) | |
1496 | { | |
1497 | stat->dds_type = os->os_phys->os_type; | |
1498 | if (os->os_dsl_dataset) | |
1499 | dsl_dataset_fast_stat(os->os_dsl_dataset, stat); | |
1500 | } | |
1501 | ||
1502 | void | |
1503 | dmu_objset_stats(objset_t *os, nvlist_t *nv) | |
1504 | { | |
1505 | ASSERT(os->os_dsl_dataset || | |
1506 | os->os_phys->os_type == DMU_OST_META); | |
1507 | ||
1508 | if (os->os_dsl_dataset != NULL) | |
1509 | dsl_dataset_stats(os->os_dsl_dataset, nv); | |
1510 | ||
1511 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, | |
1512 | os->os_phys->os_type); | |
1513 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING, | |
1514 | dmu_objset_userspace_present(os)); | |
1515 | } | |
1516 | ||
1517 | int | |
1518 | dmu_objset_is_snapshot(objset_t *os) | |
1519 | { | |
1520 | if (os->os_dsl_dataset != NULL) | |
1521 | return (dsl_dataset_is_snapshot(os->os_dsl_dataset)); | |
1522 | else | |
1523 | return (B_FALSE); | |
1524 | } | |
1525 | ||
1526 | int | |
1527 | dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, | |
1528 | boolean_t *conflict) | |
1529 | { | |
1530 | dsl_dataset_t *ds = os->os_dsl_dataset; | |
1531 | uint64_t ignored; | |
1532 | ||
1533 | if (ds->ds_phys->ds_snapnames_zapobj == 0) | |
1534 | return (ENOENT); | |
1535 | ||
1536 | return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, | |
1537 | ds->ds_phys->ds_snapnames_zapobj, name, 8, 1, &ignored, MT_FIRST, | |
1538 | real, maxlen, conflict)); | |
1539 | } | |
1540 | ||
1541 | int | |
1542 | dmu_snapshot_list_next(objset_t *os, int namelen, char *name, | |
1543 | uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) | |
1544 | { | |
1545 | dsl_dataset_t *ds = os->os_dsl_dataset; | |
1546 | zap_cursor_t cursor; | |
1547 | zap_attribute_t attr; | |
1548 | ||
1549 | if (ds->ds_phys->ds_snapnames_zapobj == 0) | |
1550 | return (ENOENT); | |
1551 | ||
1552 | zap_cursor_init_serialized(&cursor, | |
1553 | ds->ds_dir->dd_pool->dp_meta_objset, | |
1554 | ds->ds_phys->ds_snapnames_zapobj, *offp); | |
1555 | ||
1556 | if (zap_cursor_retrieve(&cursor, &attr) != 0) { | |
1557 | zap_cursor_fini(&cursor); | |
1558 | return (ENOENT); | |
1559 | } | |
1560 | ||
1561 | if (strlen(attr.za_name) + 1 > namelen) { | |
1562 | zap_cursor_fini(&cursor); | |
1563 | return (ENAMETOOLONG); | |
1564 | } | |
1565 | ||
1566 | (void) strcpy(name, attr.za_name); | |
1567 | if (idp) | |
1568 | *idp = attr.za_first_integer; | |
1569 | if (case_conflict) | |
1570 | *case_conflict = attr.za_normalization_conflict; | |
1571 | zap_cursor_advance(&cursor); | |
1572 | *offp = zap_cursor_serialize(&cursor); | |
1573 | zap_cursor_fini(&cursor); | |
1574 | ||
1575 | return (0); | |
1576 | } | |
1577 | ||
1578 | int | |
1579 | dmu_dir_list_next(objset_t *os, int namelen, char *name, | |
1580 | uint64_t *idp, uint64_t *offp) | |
1581 | { | |
1582 | dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; | |
1583 | zap_cursor_t cursor; | |
1584 | zap_attribute_t attr; | |
1585 | ||
1586 | /* there is no next dir on a snapshot! */ | |
1587 | if (os->os_dsl_dataset->ds_object != | |
1588 | dd->dd_phys->dd_head_dataset_obj) | |
1589 | return (ENOENT); | |
1590 | ||
1591 | zap_cursor_init_serialized(&cursor, | |
1592 | dd->dd_pool->dp_meta_objset, | |
1593 | dd->dd_phys->dd_child_dir_zapobj, *offp); | |
1594 | ||
1595 | if (zap_cursor_retrieve(&cursor, &attr) != 0) { | |
1596 | zap_cursor_fini(&cursor); | |
1597 | return (ENOENT); | |
1598 | } | |
1599 | ||
1600 | if (strlen(attr.za_name) + 1 > namelen) { | |
1601 | zap_cursor_fini(&cursor); | |
1602 | return (ENAMETOOLONG); | |
1603 | } | |
1604 | ||
1605 | (void) strcpy(name, attr.za_name); | |
1606 | if (idp) | |
1607 | *idp = attr.za_first_integer; | |
1608 | zap_cursor_advance(&cursor); | |
1609 | *offp = zap_cursor_serialize(&cursor); | |
1610 | zap_cursor_fini(&cursor); | |
1611 | ||
1612 | return (0); | |
1613 | } | |
1614 | ||
1615 | struct findarg { | |
1616 | int (*func)(const char *, void *); | |
1617 | void *arg; | |
1618 | }; | |
1619 | ||
1620 | /* ARGSUSED */ | |
1621 | static int | |
1622 | findfunc(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) | |
1623 | { | |
1624 | struct findarg *fa = arg; | |
1625 | return (fa->func(dsname, fa->arg)); | |
1626 | } | |
1627 | ||
1628 | /* | |
1629 | * Find all objsets under name, and for each, call 'func(child_name, arg)'. | |
1630 | * Perhaps change all callers to use dmu_objset_find_spa()? | |
1631 | */ | |
1632 | int | |
1633 | dmu_objset_find(char *name, int func(const char *, void *), void *arg, | |
1634 | int flags) | |
1635 | { | |
1636 | struct findarg fa; | |
1637 | fa.func = func; | |
1638 | fa.arg = arg; | |
1639 | return (dmu_objset_find_spa(NULL, name, findfunc, &fa, flags)); | |
1640 | } | |
1641 | ||
1642 | /* | |
1643 | * Find all objsets under name, call func on each | |
1644 | */ | |
1645 | int | |
1646 | dmu_objset_find_spa(spa_t *spa, const char *name, | |
1647 | int func(spa_t *, uint64_t, const char *, void *), void *arg, int flags) | |
1648 | { | |
1649 | dsl_dir_t *dd; | |
1650 | dsl_pool_t *dp; | |
1651 | dsl_dataset_t *ds; | |
1652 | zap_cursor_t zc; | |
1653 | zap_attribute_t *attr; | |
1654 | char *child; | |
1655 | uint64_t thisobj; | |
1656 | int err; | |
1657 | ||
1658 | if (name == NULL) | |
1659 | name = spa_name(spa); | |
1660 | err = dsl_dir_open_spa(spa, name, FTAG, &dd, NULL); | |
1661 | if (err) | |
1662 | return (err); | |
1663 | ||
1664 | /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ | |
1665 | if (dd->dd_myname[0] == '$') { | |
1666 | dsl_dir_close(dd, FTAG); | |
1667 | return (0); | |
1668 | } | |
1669 | ||
1670 | thisobj = dd->dd_phys->dd_head_dataset_obj; | |
1671 | attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); | |
1672 | dp = dd->dd_pool; | |
1673 | ||
1674 | /* | |
1675 | * Iterate over all children. | |
1676 | */ | |
1677 | if (flags & DS_FIND_CHILDREN) { | |
1678 | for (zap_cursor_init(&zc, dp->dp_meta_objset, | |
1679 | dd->dd_phys->dd_child_dir_zapobj); | |
1680 | zap_cursor_retrieve(&zc, attr) == 0; | |
1681 | (void) zap_cursor_advance(&zc)) { | |
1682 | ASSERT(attr->za_integer_length == sizeof (uint64_t)); | |
1683 | ASSERT(attr->za_num_integers == 1); | |
1684 | ||
1685 | child = kmem_asprintf("%s/%s", name, attr->za_name); | |
1686 | err = dmu_objset_find_spa(spa, child, func, arg, flags); | |
1687 | strfree(child); | |
1688 | if (err) | |
1689 | break; | |
1690 | } | |
1691 | zap_cursor_fini(&zc); | |
1692 | ||
1693 | if (err) { | |
1694 | dsl_dir_close(dd, FTAG); | |
1695 | kmem_free(attr, sizeof (zap_attribute_t)); | |
1696 | return (err); | |
1697 | } | |
1698 | } | |
1699 | ||
1700 | /* | |
1701 | * Iterate over all snapshots. | |
1702 | */ | |
1703 | if (flags & DS_FIND_SNAPSHOTS) { | |
1704 | if (!dsl_pool_sync_context(dp)) | |
1705 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
1706 | err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); | |
1707 | if (!dsl_pool_sync_context(dp)) | |
1708 | rw_exit(&dp->dp_config_rwlock); | |
1709 | ||
1710 | if (err == 0) { | |
1711 | uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; | |
1712 | dsl_dataset_rele(ds, FTAG); | |
1713 | ||
1714 | for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); | |
1715 | zap_cursor_retrieve(&zc, attr) == 0; | |
1716 | (void) zap_cursor_advance(&zc)) { | |
1717 | ASSERT(attr->za_integer_length == | |
1718 | sizeof (uint64_t)); | |
1719 | ASSERT(attr->za_num_integers == 1); | |
1720 | ||
1721 | child = kmem_asprintf("%s@%s", | |
1722 | name, attr->za_name); | |
1723 | err = func(spa, attr->za_first_integer, | |
1724 | child, arg); | |
1725 | strfree(child); | |
1726 | if (err) | |
1727 | break; | |
1728 | } | |
1729 | zap_cursor_fini(&zc); | |
1730 | } | |
1731 | } | |
1732 | ||
1733 | dsl_dir_close(dd, FTAG); | |
1734 | kmem_free(attr, sizeof (zap_attribute_t)); | |
1735 | ||
1736 | if (err) | |
1737 | return (err); | |
1738 | ||
1739 | /* | |
1740 | * Apply to self if appropriate. | |
1741 | */ | |
1742 | err = func(spa, thisobj, name, arg); | |
1743 | return (err); | |
1744 | } | |
1745 | ||
1746 | /* ARGSUSED */ | |
1747 | int | |
1748 | dmu_objset_prefetch(const char *name, void *arg) | |
1749 | { | |
1750 | dsl_dataset_t *ds; | |
1751 | ||
1752 | if (dsl_dataset_hold(name, FTAG, &ds)) | |
1753 | return (0); | |
1754 | ||
1755 | if (!BP_IS_HOLE(&ds->ds_phys->ds_bp)) { | |
1756 | mutex_enter(&ds->ds_opening_lock); | |
1757 | if (ds->ds_objset == NULL) { | |
1758 | uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; | |
1759 | zbookmark_t zb; | |
1760 | ||
1761 | SET_BOOKMARK(&zb, ds->ds_object, ZB_ROOT_OBJECT, | |
1762 | ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
1763 | ||
1764 | (void) dsl_read_nolock(NULL, dsl_dataset_get_spa(ds), | |
1765 | &ds->ds_phys->ds_bp, NULL, NULL, | |
1766 | ZIO_PRIORITY_ASYNC_READ, | |
1767 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, | |
1768 | &aflags, &zb); | |
1769 | } | |
1770 | mutex_exit(&ds->ds_opening_lock); | |
1771 | } | |
1772 | ||
1773 | dsl_dataset_rele(ds, FTAG); | |
1774 | return (0); | |
1775 | } | |
1776 | ||
1777 | void | |
1778 | dmu_objset_set_user(objset_t *os, void *user_ptr) | |
1779 | { | |
1780 | ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); | |
1781 | os->os_user_ptr = user_ptr; | |
1782 | } | |
1783 | ||
1784 | void * | |
1785 | dmu_objset_get_user(objset_t *os) | |
1786 | { | |
1787 | ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); | |
1788 | return (os->os_user_ptr); | |
1789 | } |