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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 #include <sys/zfs_context.h>
26 #include <sys/dmu.h>
27 #include <sys/dmu_objset.h>
28 #include <sys/dmu_tx.h>
29 #include <sys/dsl_dataset.h>
30 #include <sys/dsl_dir.h>
31 #include <sys/dsl_prop.h>
32 #include <sys/dsl_synctask.h>
33 #include <sys/spa.h>
34 #include <sys/zap.h>
35 #include <sys/fs/zfs.h>
36
37 #include "zfs_prop.h"
38
39 #define ZPROP_INHERIT_SUFFIX "$inherit"
40 #define ZPROP_RECVD_SUFFIX "$recvd"
41
42 static int
43 dodefault(const char *propname, int intsz, int numints, void *buf)
44 {
45 zfs_prop_t prop;
46
47 /*
48 * The setonce properties are read-only, BUT they still
49 * have a default value that can be used as the initial
50 * value.
51 */
52 if ((prop = zfs_name_to_prop(propname)) == ZPROP_INVAL ||
53 (zfs_prop_readonly(prop) && !zfs_prop_setonce(prop)))
54 return (ENOENT);
55
56 if (zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
57 if (intsz != 1)
58 return (EOVERFLOW);
59 (void) strncpy(buf, zfs_prop_default_string(prop),
60 numints);
61 } else {
62 if (intsz != 8 || numints < 1)
63 return (EOVERFLOW);
64
65 *(uint64_t *)buf = zfs_prop_default_numeric(prop);
66 }
67
68 return (0);
69 }
70
71 int
72 dsl_prop_get_dd(dsl_dir_t *dd, const char *propname,
73 int intsz, int numints, void *buf, char *setpoint, boolean_t snapshot)
74 {
75 int err = ENOENT;
76 dsl_dir_t *target = dd;
77 objset_t *mos = dd->dd_pool->dp_meta_objset;
78 zfs_prop_t prop;
79 boolean_t inheritable;
80 boolean_t inheriting = B_FALSE;
81 char *inheritstr;
82 char *recvdstr;
83
84 ASSERT(RW_LOCK_HELD(&dd->dd_pool->dp_config_rwlock));
85
86 if (setpoint)
87 setpoint[0] = '\0';
88
89 prop = zfs_name_to_prop(propname);
90 inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
91 inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
92 recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
93
94 /*
95 * Note: dd may become NULL, therefore we shouldn't dereference it
96 * after this loop.
97 */
98 for (; dd != NULL; dd = dd->dd_parent) {
99 ASSERT(RW_LOCK_HELD(&dd->dd_pool->dp_config_rwlock));
100
101 if (dd != target || snapshot) {
102 if (!inheritable)
103 break;
104 inheriting = B_TRUE;
105 }
106
107 /* Check for a local value. */
108 err = zap_lookup(mos, dd->dd_phys->dd_props_zapobj, propname,
109 intsz, numints, buf);
110 if (err != ENOENT) {
111 if (setpoint != NULL && err == 0)
112 dsl_dir_name(dd, setpoint);
113 break;
114 }
115
116 /*
117 * Skip the check for a received value if there is an explicit
118 * inheritance entry.
119 */
120 err = zap_contains(mos, dd->dd_phys->dd_props_zapobj,
121 inheritstr);
122 if (err != 0 && err != ENOENT)
123 break;
124
125 if (err == ENOENT) {
126 /* Check for a received value. */
127 err = zap_lookup(mos, dd->dd_phys->dd_props_zapobj,
128 recvdstr, intsz, numints, buf);
129 if (err != ENOENT) {
130 if (setpoint != NULL && err == 0) {
131 if (inheriting) {
132 dsl_dir_name(dd, setpoint);
133 } else {
134 (void) strcpy(setpoint,
135 ZPROP_SOURCE_VAL_RECVD);
136 }
137 }
138 break;
139 }
140 }
141
142 /*
143 * If we found an explicit inheritance entry, err is zero even
144 * though we haven't yet found the value, so reinitializing err
145 * at the end of the loop (instead of at the beginning) ensures
146 * that err has a valid post-loop value.
147 */
148 err = ENOENT;
149 }
150
151 if (err == ENOENT)
152 err = dodefault(propname, intsz, numints, buf);
153
154 strfree(inheritstr);
155 strfree(recvdstr);
156
157 return (err);
158 }
159
160 int
161 dsl_prop_get_ds(dsl_dataset_t *ds, const char *propname,
162 int intsz, int numints, void *buf, char *setpoint)
163 {
164 zfs_prop_t prop = zfs_name_to_prop(propname);
165 boolean_t inheritable;
166 boolean_t snapshot;
167 uint64_t zapobj;
168
169 ASSERT(RW_LOCK_HELD(&ds->ds_dir->dd_pool->dp_config_rwlock));
170 inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
171 snapshot = (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds));
172 zapobj = (ds->ds_phys == NULL ? 0 : ds->ds_phys->ds_props_obj);
173
174 if (zapobj != 0) {
175 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
176 int err;
177
178 ASSERT(snapshot);
179
180 /* Check for a local value. */
181 err = zap_lookup(mos, zapobj, propname, intsz, numints, buf);
182 if (err != ENOENT) {
183 if (setpoint != NULL && err == 0)
184 dsl_dataset_name(ds, setpoint);
185 return (err);
186 }
187
188 /*
189 * Skip the check for a received value if there is an explicit
190 * inheritance entry.
191 */
192 if (inheritable) {
193 char *inheritstr = kmem_asprintf("%s%s", propname,
194 ZPROP_INHERIT_SUFFIX);
195 err = zap_contains(mos, zapobj, inheritstr);
196 strfree(inheritstr);
197 if (err != 0 && err != ENOENT)
198 return (err);
199 }
200
201 if (err == ENOENT) {
202 /* Check for a received value. */
203 char *recvdstr = kmem_asprintf("%s%s", propname,
204 ZPROP_RECVD_SUFFIX);
205 err = zap_lookup(mos, zapobj, recvdstr,
206 intsz, numints, buf);
207 strfree(recvdstr);
208 if (err != ENOENT) {
209 if (setpoint != NULL && err == 0)
210 (void) strcpy(setpoint,
211 ZPROP_SOURCE_VAL_RECVD);
212 return (err);
213 }
214 }
215 }
216
217 return (dsl_prop_get_dd(ds->ds_dir, propname,
218 intsz, numints, buf, setpoint, snapshot));
219 }
220
221 /*
222 * Register interest in the named property. We'll call the callback
223 * once to notify it of the current property value, and again each time
224 * the property changes, until this callback is unregistered.
225 *
226 * Return 0 on success, errno if the prop is not an integer value.
227 */
228 int
229 dsl_prop_register(dsl_dataset_t *ds, const char *propname,
230 dsl_prop_changed_cb_t *callback, void *cbarg)
231 {
232 dsl_dir_t *dd = ds->ds_dir;
233 dsl_pool_t *dp = dd->dd_pool;
234 uint64_t value;
235 dsl_prop_cb_record_t *cbr;
236 int err;
237 int need_rwlock;
238
239 need_rwlock = !RW_WRITE_HELD(&dp->dp_config_rwlock);
240 if (need_rwlock)
241 rw_enter(&dp->dp_config_rwlock, RW_READER);
242
243 err = dsl_prop_get_ds(ds, propname, 8, 1, &value, NULL);
244 if (err != 0) {
245 if (need_rwlock)
246 rw_exit(&dp->dp_config_rwlock);
247 return (err);
248 }
249
250 cbr = kmem_alloc(sizeof (dsl_prop_cb_record_t), KM_SLEEP);
251 cbr->cbr_ds = ds;
252 cbr->cbr_propname = kmem_alloc(strlen(propname)+1, KM_SLEEP);
253 (void) strcpy((char *)cbr->cbr_propname, propname);
254 cbr->cbr_func = callback;
255 cbr->cbr_arg = cbarg;
256 mutex_enter(&dd->dd_lock);
257 list_insert_head(&dd->dd_prop_cbs, cbr);
258 mutex_exit(&dd->dd_lock);
259
260 cbr->cbr_func(cbr->cbr_arg, value);
261
262 if (need_rwlock)
263 rw_exit(&dp->dp_config_rwlock);
264 return (0);
265 }
266
267 int
268 dsl_prop_get(const char *dsname, const char *propname,
269 int intsz, int numints, void *buf, char *setpoint)
270 {
271 dsl_dataset_t *ds;
272 int err;
273
274 err = dsl_dataset_hold(dsname, FTAG, &ds);
275 if (err)
276 return (err);
277
278 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
279 err = dsl_prop_get_ds(ds, propname, intsz, numints, buf, setpoint);
280 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
281
282 dsl_dataset_rele(ds, FTAG);
283 return (err);
284 }
285
286 /*
287 * Get the current property value. It may have changed by the time this
288 * function returns, so it is NOT safe to follow up with
289 * dsl_prop_register() and assume that the value has not changed in
290 * between.
291 *
292 * Return 0 on success, ENOENT if ddname is invalid.
293 */
294 int
295 dsl_prop_get_integer(const char *ddname, const char *propname,
296 uint64_t *valuep, char *setpoint)
297 {
298 return (dsl_prop_get(ddname, propname, 8, 1, valuep, setpoint));
299 }
300
301 void
302 dsl_prop_setarg_init_uint64(dsl_prop_setarg_t *psa, const char *propname,
303 zprop_source_t source, uint64_t *value)
304 {
305 psa->psa_name = propname;
306 psa->psa_source = source;
307 psa->psa_intsz = 8;
308 psa->psa_numints = 1;
309 psa->psa_value = value;
310
311 psa->psa_effective_value = -1ULL;
312 }
313
314 /*
315 * Predict the effective value of the given special property if it were set with
316 * the given value and source. This is not a general purpose function. It exists
317 * only to handle the special requirements of the quota and reservation
318 * properties. The fact that these properties are non-inheritable greatly
319 * simplifies the prediction logic.
320 *
321 * Returns 0 on success, a positive error code on failure, or -1 if called with
322 * a property not handled by this function.
323 */
324 int
325 dsl_prop_predict_sync(dsl_dir_t *dd, dsl_prop_setarg_t *psa)
326 {
327 const char *propname = psa->psa_name;
328 zfs_prop_t prop = zfs_name_to_prop(propname);
329 zprop_source_t source = psa->psa_source;
330 objset_t *mos;
331 uint64_t zapobj;
332 uint64_t version;
333 char *recvdstr;
334 int err = 0;
335
336 switch (prop) {
337 case ZFS_PROP_QUOTA:
338 case ZFS_PROP_RESERVATION:
339 case ZFS_PROP_REFQUOTA:
340 case ZFS_PROP_REFRESERVATION:
341 break;
342 default:
343 return (-1);
344 }
345
346 mos = dd->dd_pool->dp_meta_objset;
347 zapobj = dd->dd_phys->dd_props_zapobj;
348 recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
349
350 version = spa_version(dd->dd_pool->dp_spa);
351 if (version < SPA_VERSION_RECVD_PROPS) {
352 if (source & ZPROP_SRC_NONE)
353 source = ZPROP_SRC_NONE;
354 else if (source & ZPROP_SRC_RECEIVED)
355 source = ZPROP_SRC_LOCAL;
356 }
357
358 switch (source) {
359 case ZPROP_SRC_NONE:
360 /* Revert to the received value, if any. */
361 err = zap_lookup(mos, zapobj, recvdstr, 8, 1,
362 &psa->psa_effective_value);
363 if (err == ENOENT)
364 psa->psa_effective_value = 0;
365 break;
366 case ZPROP_SRC_LOCAL:
367 psa->psa_effective_value = *(uint64_t *)psa->psa_value;
368 break;
369 case ZPROP_SRC_RECEIVED:
370 /*
371 * If there's no local setting, then the new received value will
372 * be the effective value.
373 */
374 err = zap_lookup(mos, zapobj, propname, 8, 1,
375 &psa->psa_effective_value);
376 if (err == ENOENT)
377 psa->psa_effective_value = *(uint64_t *)psa->psa_value;
378 break;
379 case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
380 /*
381 * We're clearing the received value, so the local setting (if
382 * it exists) remains the effective value.
383 */
384 err = zap_lookup(mos, zapobj, propname, 8, 1,
385 &psa->psa_effective_value);
386 if (err == ENOENT)
387 psa->psa_effective_value = 0;
388 break;
389 default:
390 cmn_err(CE_PANIC, "unexpected property source: %d", source);
391 }
392
393 strfree(recvdstr);
394
395 if (err == ENOENT)
396 return (0);
397
398 return (err);
399 }
400
401 #ifdef ZFS_DEBUG
402 void
403 dsl_prop_check_prediction(dsl_dir_t *dd, dsl_prop_setarg_t *psa)
404 {
405 zfs_prop_t prop = zfs_name_to_prop(psa->psa_name);
406 uint64_t intval;
407 char setpoint[MAXNAMELEN];
408 uint64_t version = spa_version(dd->dd_pool->dp_spa);
409 int err;
410
411 if (version < SPA_VERSION_RECVD_PROPS) {
412 switch (prop) {
413 case ZFS_PROP_QUOTA:
414 case ZFS_PROP_RESERVATION:
415 return;
416 default:
417 break;
418 }
419 }
420
421 err = dsl_prop_get_dd(dd, psa->psa_name, 8, 1, &intval,
422 setpoint, B_FALSE);
423 if (err == 0 && intval != psa->psa_effective_value) {
424 cmn_err(CE_PANIC, "%s property, source: %x, "
425 "predicted effective value: %llu, "
426 "actual effective value: %llu (setpoint: %s)",
427 psa->psa_name, psa->psa_source,
428 (unsigned long long)psa->psa_effective_value,
429 (unsigned long long)intval, setpoint);
430 }
431 }
432 #endif
433
434 /*
435 * Unregister this callback. Return 0 on success, ENOENT if ddname is
436 * invalid, ENOMSG if no matching callback registered.
437 */
438 int
439 dsl_prop_unregister(dsl_dataset_t *ds, const char *propname,
440 dsl_prop_changed_cb_t *callback, void *cbarg)
441 {
442 dsl_dir_t *dd = ds->ds_dir;
443 dsl_prop_cb_record_t *cbr;
444
445 mutex_enter(&dd->dd_lock);
446 for (cbr = list_head(&dd->dd_prop_cbs);
447 cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) {
448 if (cbr->cbr_ds == ds &&
449 cbr->cbr_func == callback &&
450 cbr->cbr_arg == cbarg &&
451 strcmp(cbr->cbr_propname, propname) == 0)
452 break;
453 }
454
455 if (cbr == NULL) {
456 mutex_exit(&dd->dd_lock);
457 return (ENOMSG);
458 }
459
460 list_remove(&dd->dd_prop_cbs, cbr);
461 mutex_exit(&dd->dd_lock);
462 kmem_free((void*)cbr->cbr_propname, strlen(cbr->cbr_propname)+1);
463 kmem_free(cbr, sizeof (dsl_prop_cb_record_t));
464
465 return (0);
466 }
467
468 /*
469 * Return the number of callbacks that are registered for this dataset.
470 */
471 int
472 dsl_prop_numcb(dsl_dataset_t *ds)
473 {
474 dsl_dir_t *dd = ds->ds_dir;
475 dsl_prop_cb_record_t *cbr;
476 int num = 0;
477
478 mutex_enter(&dd->dd_lock);
479 for (cbr = list_head(&dd->dd_prop_cbs);
480 cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) {
481 if (cbr->cbr_ds == ds)
482 num++;
483 }
484 mutex_exit(&dd->dd_lock);
485
486 return (num);
487 }
488
489 static void
490 dsl_prop_changed_notify(dsl_pool_t *dp, uint64_t ddobj,
491 const char *propname, uint64_t value, int first)
492 {
493 dsl_dir_t *dd;
494 dsl_prop_cb_record_t *cbr;
495 objset_t *mos = dp->dp_meta_objset;
496 zap_cursor_t zc;
497 zap_attribute_t *za;
498 int err;
499
500 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock));
501 err = dsl_dir_open_obj(dp, ddobj, NULL, FTAG, &dd);
502 if (err)
503 return;
504
505 if (!first) {
506 /*
507 * If the prop is set here, then this change is not
508 * being inherited here or below; stop the recursion.
509 */
510 err = zap_contains(mos, dd->dd_phys->dd_props_zapobj, propname);
511 if (err == 0) {
512 dsl_dir_close(dd, FTAG);
513 return;
514 }
515 ASSERT3U(err, ==, ENOENT);
516 }
517
518 mutex_enter(&dd->dd_lock);
519 for (cbr = list_head(&dd->dd_prop_cbs); cbr;
520 cbr = list_next(&dd->dd_prop_cbs, cbr)) {
521 uint64_t propobj = cbr->cbr_ds->ds_phys->ds_props_obj;
522
523 if (strcmp(cbr->cbr_propname, propname) != 0)
524 continue;
525
526 /*
527 * If the property is set on this ds, then it is not
528 * inherited here; don't call the callback.
529 */
530 if (propobj && 0 == zap_contains(mos, propobj, propname))
531 continue;
532
533 cbr->cbr_func(cbr->cbr_arg, value);
534 }
535 mutex_exit(&dd->dd_lock);
536
537 za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
538 for (zap_cursor_init(&zc, mos,
539 dd->dd_phys->dd_child_dir_zapobj);
540 zap_cursor_retrieve(&zc, za) == 0;
541 zap_cursor_advance(&zc)) {
542 dsl_prop_changed_notify(dp, za->za_first_integer,
543 propname, value, FALSE);
544 }
545 kmem_free(za, sizeof (zap_attribute_t));
546 zap_cursor_fini(&zc);
547 dsl_dir_close(dd, FTAG);
548 }
549
550 void
551 dsl_prop_set_sync(void *arg1, void *arg2, dmu_tx_t *tx)
552 {
553 dsl_dataset_t *ds = arg1;
554 dsl_prop_setarg_t *psa = arg2;
555 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
556 uint64_t zapobj, intval, dummy;
557 int isint;
558 char valbuf[32];
559 char *valstr = NULL;
560 char *inheritstr;
561 char *recvdstr;
562 char *tbuf = NULL;
563 int err;
564 uint64_t version = spa_version(ds->ds_dir->dd_pool->dp_spa);
565 const char *propname = psa->psa_name;
566 zprop_source_t source = psa->psa_source;
567
568 isint = (dodefault(propname, 8, 1, &intval) == 0);
569
570 if (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds)) {
571 ASSERT(version >= SPA_VERSION_SNAP_PROPS);
572 if (ds->ds_phys->ds_props_obj == 0) {
573 dmu_buf_will_dirty(ds->ds_dbuf, tx);
574 ds->ds_phys->ds_props_obj =
575 zap_create(mos,
576 DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
577 }
578 zapobj = ds->ds_phys->ds_props_obj;
579 } else {
580 zapobj = ds->ds_dir->dd_phys->dd_props_zapobj;
581 }
582
583 if (version < SPA_VERSION_RECVD_PROPS) {
584 zfs_prop_t prop = zfs_name_to_prop(propname);
585 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION)
586 return;
587
588 if (source & ZPROP_SRC_NONE)
589 source = ZPROP_SRC_NONE;
590 else if (source & ZPROP_SRC_RECEIVED)
591 source = ZPROP_SRC_LOCAL;
592 }
593
594 inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
595 recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
596
597 switch (source) {
598 case ZPROP_SRC_NONE:
599 /*
600 * revert to received value, if any (inherit -S)
601 * - remove propname
602 * - remove propname$inherit
603 */
604 err = zap_remove(mos, zapobj, propname, tx);
605 ASSERT(err == 0 || err == ENOENT);
606 err = zap_remove(mos, zapobj, inheritstr, tx);
607 ASSERT(err == 0 || err == ENOENT);
608 break;
609 case ZPROP_SRC_LOCAL:
610 /*
611 * remove propname$inherit
612 * set propname -> value
613 */
614 err = zap_remove(mos, zapobj, inheritstr, tx);
615 ASSERT(err == 0 || err == ENOENT);
616 VERIFY(0 == zap_update(mos, zapobj, propname,
617 psa->psa_intsz, psa->psa_numints, psa->psa_value, tx));
618 break;
619 case ZPROP_SRC_INHERITED:
620 /*
621 * explicitly inherit
622 * - remove propname
623 * - set propname$inherit
624 */
625 err = zap_remove(mos, zapobj, propname, tx);
626 ASSERT(err == 0 || err == ENOENT);
627 if (version >= SPA_VERSION_RECVD_PROPS &&
628 dsl_prop_get_ds(ds, ZPROP_HAS_RECVD, 8, 1, &dummy,
629 NULL) == 0) {
630 dummy = 0;
631 err = zap_update(mos, zapobj, inheritstr,
632 8, 1, &dummy, tx);
633 ASSERT(err == 0);
634 }
635 break;
636 case ZPROP_SRC_RECEIVED:
637 /*
638 * set propname$recvd -> value
639 */
640 err = zap_update(mos, zapobj, recvdstr,
641 psa->psa_intsz, psa->psa_numints, psa->psa_value, tx);
642 ASSERT(err == 0);
643 break;
644 case (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED):
645 /*
646 * clear local and received settings
647 * - remove propname
648 * - remove propname$inherit
649 * - remove propname$recvd
650 */
651 err = zap_remove(mos, zapobj, propname, tx);
652 ASSERT(err == 0 || err == ENOENT);
653 err = zap_remove(mos, zapobj, inheritstr, tx);
654 ASSERT(err == 0 || err == ENOENT);
655 /* FALLTHRU */
656 case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
657 /*
658 * remove propname$recvd
659 */
660 err = zap_remove(mos, zapobj, recvdstr, tx);
661 ASSERT(err == 0 || err == ENOENT);
662 break;
663 default:
664 cmn_err(CE_PANIC, "unexpected property source: %d", source);
665 }
666
667 strfree(inheritstr);
668 strfree(recvdstr);
669
670 if (isint) {
671 VERIFY(0 == dsl_prop_get_ds(ds, propname, 8, 1, &intval, NULL));
672
673 if (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds)) {
674 dsl_prop_cb_record_t *cbr;
675 /*
676 * It's a snapshot; nothing can inherit this
677 * property, so just look for callbacks on this
678 * ds here.
679 */
680 mutex_enter(&ds->ds_dir->dd_lock);
681 for (cbr = list_head(&ds->ds_dir->dd_prop_cbs); cbr;
682 cbr = list_next(&ds->ds_dir->dd_prop_cbs, cbr)) {
683 if (cbr->cbr_ds == ds &&
684 strcmp(cbr->cbr_propname, propname) == 0)
685 cbr->cbr_func(cbr->cbr_arg, intval);
686 }
687 mutex_exit(&ds->ds_dir->dd_lock);
688 } else {
689 dsl_prop_changed_notify(ds->ds_dir->dd_pool,
690 ds->ds_dir->dd_object, propname, intval, TRUE);
691 }
692
693 (void) snprintf(valbuf, sizeof (valbuf),
694 "%lld", (longlong_t)intval);
695 valstr = valbuf;
696 } else {
697 if (source == ZPROP_SRC_LOCAL) {
698 valstr = (char *)psa->psa_value;
699 } else {
700 tbuf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
701 if (dsl_prop_get_ds(ds, propname, 1,
702 ZAP_MAXVALUELEN, tbuf, NULL) == 0)
703 valstr = tbuf;
704 }
705 }
706
707 spa_history_log_internal((source == ZPROP_SRC_NONE ||
708 source == ZPROP_SRC_INHERITED) ? LOG_DS_INHERIT :
709 LOG_DS_PROPSET, ds->ds_dir->dd_pool->dp_spa, tx,
710 "%s=%s dataset = %llu", propname,
711 (valstr == NULL ? "" : valstr), ds->ds_object);
712
713 if (tbuf != NULL)
714 kmem_free(tbuf, ZAP_MAXVALUELEN);
715 }
716
717 void
718 dsl_props_set_sync(void *arg1, void *arg2, dmu_tx_t *tx)
719 {
720 dsl_dataset_t *ds = arg1;
721 dsl_props_arg_t *pa = arg2;
722 nvlist_t *props = pa->pa_props;
723 dsl_prop_setarg_t psa;
724 nvpair_t *elem = NULL;
725
726 psa.psa_source = pa->pa_source;
727
728 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
729 nvpair_t *pair = elem;
730
731 psa.psa_name = nvpair_name(pair);
732
733 if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
734 /*
735 * dsl_prop_get_all_impl() returns properties in this
736 * format.
737 */
738 nvlist_t *attrs;
739 VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
740 VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
741 &pair) == 0);
742 }
743
744 if (nvpair_type(pair) == DATA_TYPE_STRING) {
745 VERIFY(nvpair_value_string(pair,
746 (char **)&psa.psa_value) == 0);
747 psa.psa_intsz = 1;
748 psa.psa_numints = strlen(psa.psa_value) + 1;
749 } else {
750 uint64_t intval;
751 VERIFY(nvpair_value_uint64(pair, &intval) == 0);
752 psa.psa_intsz = sizeof (intval);
753 psa.psa_numints = 1;
754 psa.psa_value = &intval;
755 }
756 dsl_prop_set_sync(ds, &psa, tx);
757 }
758 }
759
760 void
761 dsl_dir_prop_set_uint64_sync(dsl_dir_t *dd, const char *name, uint64_t val,
762 dmu_tx_t *tx)
763 {
764 objset_t *mos = dd->dd_pool->dp_meta_objset;
765 uint64_t zapobj = dd->dd_phys->dd_props_zapobj;
766
767 ASSERT(dmu_tx_is_syncing(tx));
768
769 VERIFY(0 == zap_update(mos, zapobj, name, sizeof (val), 1, &val, tx));
770
771 dsl_prop_changed_notify(dd->dd_pool, dd->dd_object, name, val, TRUE);
772
773 spa_history_log_internal(LOG_DS_PROPSET, dd->dd_pool->dp_spa, tx,
774 "%s=%llu dataset = %llu", name, (u_longlong_t)val,
775 dd->dd_phys->dd_head_dataset_obj);
776 }
777
778 int
779 dsl_prop_set(const char *dsname, const char *propname, zprop_source_t source,
780 int intsz, int numints, const void *buf)
781 {
782 dsl_dataset_t *ds;
783 uint64_t version;
784 int err;
785 dsl_prop_setarg_t psa;
786
787 /*
788 * We must do these checks before we get to the syncfunc, since
789 * it can't fail.
790 */
791 if (strlen(propname) >= ZAP_MAXNAMELEN)
792 return (ENAMETOOLONG);
793
794 err = dsl_dataset_hold(dsname, FTAG, &ds);
795 if (err)
796 return (err);
797
798 version = spa_version(ds->ds_dir->dd_pool->dp_spa);
799 if (intsz * numints >= (version < SPA_VERSION_STMF_PROP ?
800 ZAP_OLDMAXVALUELEN : ZAP_MAXVALUELEN)) {
801 dsl_dataset_rele(ds, FTAG);
802 return (E2BIG);
803 }
804 if (dsl_dataset_is_snapshot(ds) &&
805 version < SPA_VERSION_SNAP_PROPS) {
806 dsl_dataset_rele(ds, FTAG);
807 return (ENOTSUP);
808 }
809
810 psa.psa_name = propname;
811 psa.psa_source = source;
812 psa.psa_intsz = intsz;
813 psa.psa_numints = numints;
814 psa.psa_value = buf;
815 psa.psa_effective_value = -1ULL;
816
817 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
818 NULL, dsl_prop_set_sync, ds, &psa, 2);
819
820 dsl_dataset_rele(ds, FTAG);
821 return (err);
822 }
823
824 int
825 dsl_props_set(const char *dsname, zprop_source_t source, nvlist_t *props)
826 {
827 dsl_dataset_t *ds;
828 uint64_t version;
829 nvpair_t *elem = NULL;
830 dsl_props_arg_t pa;
831 int err;
832
833 if ((err = dsl_dataset_hold(dsname, FTAG, &ds)))
834 return (err);
835 /*
836 * Do these checks before the syncfunc, since it can't fail.
837 */
838 version = spa_version(ds->ds_dir->dd_pool->dp_spa);
839 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
840 if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
841 dsl_dataset_rele(ds, FTAG);
842 return (ENAMETOOLONG);
843 }
844 if (nvpair_type(elem) == DATA_TYPE_STRING) {
845 char *valstr;
846 VERIFY(nvpair_value_string(elem, &valstr) == 0);
847 if (strlen(valstr) >= (version <
848 SPA_VERSION_STMF_PROP ?
849 ZAP_OLDMAXVALUELEN : ZAP_MAXVALUELEN)) {
850 dsl_dataset_rele(ds, FTAG);
851 return (E2BIG);
852 }
853 }
854 }
855
856 if (dsl_dataset_is_snapshot(ds) &&
857 version < SPA_VERSION_SNAP_PROPS) {
858 dsl_dataset_rele(ds, FTAG);
859 return (ENOTSUP);
860 }
861
862 pa.pa_props = props;
863 pa.pa_source = source;
864
865 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
866 NULL, dsl_props_set_sync, ds, &pa, 2);
867
868 dsl_dataset_rele(ds, FTAG);
869 return (err);
870 }
871
872 typedef enum dsl_prop_getflags {
873 DSL_PROP_GET_INHERITING = 0x1, /* searching parent of target ds */
874 DSL_PROP_GET_SNAPSHOT = 0x2, /* snapshot dataset */
875 DSL_PROP_GET_LOCAL = 0x4, /* local properties */
876 DSL_PROP_GET_RECEIVED = 0x8 /* received properties */
877 } dsl_prop_getflags_t;
878
879 static int
880 dsl_prop_get_all_impl(objset_t *mos, uint64_t propobj,
881 const char *setpoint, dsl_prop_getflags_t flags, nvlist_t *nv)
882 {
883 zap_cursor_t zc;
884 zap_attribute_t za;
885 int err = 0;
886
887 for (zap_cursor_init(&zc, mos, propobj);
888 (err = zap_cursor_retrieve(&zc, &za)) == 0;
889 zap_cursor_advance(&zc)) {
890 nvlist_t *propval;
891 zfs_prop_t prop;
892 char buf[ZAP_MAXNAMELEN];
893 char *valstr;
894 const char *suffix;
895 const char *propname;
896 const char *source;
897
898 suffix = strchr(za.za_name, '$');
899
900 if (suffix == NULL) {
901 /*
902 * Skip local properties if we only want received
903 * properties.
904 */
905 if (flags & DSL_PROP_GET_RECEIVED)
906 continue;
907
908 propname = za.za_name;
909 source = setpoint;
910 } else if (strcmp(suffix, ZPROP_INHERIT_SUFFIX) == 0) {
911 /* Skip explicitly inherited entries. */
912 continue;
913 } else if (strcmp(suffix, ZPROP_RECVD_SUFFIX) == 0) {
914 if (flags & DSL_PROP_GET_LOCAL)
915 continue;
916
917 (void) strncpy(buf, za.za_name, (suffix - za.za_name));
918 buf[suffix - za.za_name] = '\0';
919 propname = buf;
920
921 if (!(flags & DSL_PROP_GET_RECEIVED)) {
922 /* Skip if locally overridden. */
923 err = zap_contains(mos, propobj, propname);
924 if (err == 0)
925 continue;
926 if (err != ENOENT)
927 break;
928
929 /* Skip if explicitly inherited. */
930 valstr = kmem_asprintf("%s%s", propname,
931 ZPROP_INHERIT_SUFFIX);
932 err = zap_contains(mos, propobj, valstr);
933 strfree(valstr);
934 if (err == 0)
935 continue;
936 if (err != ENOENT)
937 break;
938 }
939
940 source = ((flags & DSL_PROP_GET_INHERITING) ?
941 setpoint : ZPROP_SOURCE_VAL_RECVD);
942 } else {
943 /*
944 * For backward compatibility, skip suffixes we don't
945 * recognize.
946 */
947 continue;
948 }
949
950 prop = zfs_name_to_prop(propname);
951
952 /* Skip non-inheritable properties. */
953 if ((flags & DSL_PROP_GET_INHERITING) && prop != ZPROP_INVAL &&
954 !zfs_prop_inheritable(prop))
955 continue;
956
957 /* Skip properties not valid for this type. */
958 if ((flags & DSL_PROP_GET_SNAPSHOT) && prop != ZPROP_INVAL &&
959 !zfs_prop_valid_for_type(prop, ZFS_TYPE_SNAPSHOT))
960 continue;
961
962 /* Skip properties already defined. */
963 if (nvlist_exists(nv, propname))
964 continue;
965
966 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
967 if (za.za_integer_length == 1) {
968 /*
969 * String property
970 */
971 char *tmp = kmem_alloc(za.za_num_integers,
972 KM_SLEEP);
973 err = zap_lookup(mos, propobj,
974 za.za_name, 1, za.za_num_integers, tmp);
975 if (err != 0) {
976 kmem_free(tmp, za.za_num_integers);
977 break;
978 }
979 VERIFY(nvlist_add_string(propval, ZPROP_VALUE,
980 tmp) == 0);
981 kmem_free(tmp, za.za_num_integers);
982 } else {
983 /*
984 * Integer property
985 */
986 ASSERT(za.za_integer_length == 8);
987 (void) nvlist_add_uint64(propval, ZPROP_VALUE,
988 za.za_first_integer);
989 }
990
991 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, source) == 0);
992 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
993 nvlist_free(propval);
994 }
995 zap_cursor_fini(&zc);
996 if (err == ENOENT)
997 err = 0;
998 return (err);
999 }
1000
1001 /*
1002 * Iterate over all properties for this dataset and return them in an nvlist.
1003 */
1004 static int
1005 dsl_prop_get_all_ds(dsl_dataset_t *ds, nvlist_t **nvp,
1006 dsl_prop_getflags_t flags)
1007 {
1008 dsl_dir_t *dd = ds->ds_dir;
1009 dsl_pool_t *dp = dd->dd_pool;
1010 objset_t *mos = dp->dp_meta_objset;
1011 int err = 0;
1012 char setpoint[MAXNAMELEN];
1013
1014 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1015
1016 if (dsl_dataset_is_snapshot(ds))
1017 flags |= DSL_PROP_GET_SNAPSHOT;
1018
1019 rw_enter(&dp->dp_config_rwlock, RW_READER);
1020
1021 if (ds->ds_phys->ds_props_obj != 0) {
1022 ASSERT(flags & DSL_PROP_GET_SNAPSHOT);
1023 dsl_dataset_name(ds, setpoint);
1024 err = dsl_prop_get_all_impl(mos, ds->ds_phys->ds_props_obj,
1025 setpoint, flags, *nvp);
1026 if (err)
1027 goto out;
1028 }
1029
1030 for (; dd != NULL; dd = dd->dd_parent) {
1031 if (dd != ds->ds_dir || (flags & DSL_PROP_GET_SNAPSHOT)) {
1032 if (flags & (DSL_PROP_GET_LOCAL |
1033 DSL_PROP_GET_RECEIVED))
1034 break;
1035 flags |= DSL_PROP_GET_INHERITING;
1036 }
1037 dsl_dir_name(dd, setpoint);
1038 err = dsl_prop_get_all_impl(mos, dd->dd_phys->dd_props_zapobj,
1039 setpoint, flags, *nvp);
1040 if (err)
1041 break;
1042 }
1043 out:
1044 rw_exit(&dp->dp_config_rwlock);
1045 return (err);
1046 }
1047
1048 boolean_t
1049 dsl_prop_get_hasrecvd(objset_t *os)
1050 {
1051 dsl_dataset_t *ds = os->os_dsl_dataset;
1052 int rc;
1053 uint64_t dummy;
1054
1055 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
1056 rc = dsl_prop_get_ds(ds, ZPROP_HAS_RECVD, 8, 1, &dummy, NULL);
1057 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
1058 ASSERT(rc != 0 || spa_version(os->os_spa) >= SPA_VERSION_RECVD_PROPS);
1059 return (rc == 0);
1060 }
1061
1062 static void
1063 dsl_prop_set_hasrecvd_impl(objset_t *os, zprop_source_t source)
1064 {
1065 dsl_dataset_t *ds = os->os_dsl_dataset;
1066 uint64_t dummy = 0;
1067 dsl_prop_setarg_t psa;
1068
1069 if (spa_version(os->os_spa) < SPA_VERSION_RECVD_PROPS)
1070 return;
1071
1072 dsl_prop_setarg_init_uint64(&psa, ZPROP_HAS_RECVD, source, &dummy);
1073
1074 (void) dsl_sync_task_do(ds->ds_dir->dd_pool, NULL,
1075 dsl_prop_set_sync, ds, &psa, 2);
1076 }
1077
1078 /*
1079 * Call after successfully receiving properties to ensure that only the first
1080 * receive on or after SPA_VERSION_RECVD_PROPS blows away local properties.
1081 */
1082 void
1083 dsl_prop_set_hasrecvd(objset_t *os)
1084 {
1085 if (dsl_prop_get_hasrecvd(os)) {
1086 ASSERT(spa_version(os->os_spa) >= SPA_VERSION_RECVD_PROPS);
1087 return;
1088 }
1089 dsl_prop_set_hasrecvd_impl(os, ZPROP_SRC_LOCAL);
1090 }
1091
1092 void
1093 dsl_prop_unset_hasrecvd(objset_t *os)
1094 {
1095 dsl_prop_set_hasrecvd_impl(os, ZPROP_SRC_NONE);
1096 }
1097
1098 int
1099 dsl_prop_get_all(objset_t *os, nvlist_t **nvp)
1100 {
1101 return (dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, 0));
1102 }
1103
1104 int
1105 dsl_prop_get_received(objset_t *os, nvlist_t **nvp)
1106 {
1107 /*
1108 * Received properties are not distinguishable from local properties
1109 * until the dataset has received properties on or after
1110 * SPA_VERSION_RECVD_PROPS.
1111 */
1112 dsl_prop_getflags_t flags = (dsl_prop_get_hasrecvd(os) ?
1113 DSL_PROP_GET_RECEIVED : DSL_PROP_GET_LOCAL);
1114 return (dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, flags));
1115 }
1116
1117 void
1118 dsl_prop_nvlist_add_uint64(nvlist_t *nv, zfs_prop_t prop, uint64_t value)
1119 {
1120 nvlist_t *propval;
1121 const char *propname = zfs_prop_to_name(prop);
1122 uint64_t default_value;
1123
1124 if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1125 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1126 return;
1127 }
1128
1129 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1130 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1131 /* Indicate the default source if we can. */
1132 if (dodefault(propname, 8, 1, &default_value) == 0 &&
1133 value == default_value) {
1134 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, "") == 0);
1135 }
1136 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1137 nvlist_free(propval);
1138 }
1139
1140 void
1141 dsl_prop_nvlist_add_string(nvlist_t *nv, zfs_prop_t prop, const char *value)
1142 {
1143 nvlist_t *propval;
1144 const char *propname = zfs_prop_to_name(prop);
1145
1146 if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1147 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1148 return;
1149 }
1150
1151 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1152 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1153 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1154 nvlist_free(propval);
1155 }
1156
1157 #if defined(_KERNEL) && defined(HAVE_SPL)
1158 EXPORT_SYMBOL(dsl_prop_set);
1159 EXPORT_SYMBOL(dsl_prop_get_all);
1160 EXPORT_SYMBOL(dsl_prop_nvlist_add_uint64);
1161 EXPORT_SYMBOL(dsl_prop_get_integer);
1162 #endif
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