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1949 crash during reguid causes stale config
[unleashed.git] / usr / src / uts / common / fs / zfs / dsl_prop.c
blobaa66b32e79388cbe0b7cc68caf33a33c30ca9bdf
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 }
417 }
418
419 err = dsl_prop_get_dd(dd, psa->psa_name, 8, 1, &intval,
420 setpoint, B_FALSE);
421 if (err == 0 && intval != psa->psa_effective_value) {
422 cmn_err(CE_PANIC, "%s property, source: %x, "
423 "predicted effective value: %llu, "
424 "actual effective value: %llu (setpoint: %s)",
425 psa->psa_name, psa->psa_source,
426 (unsigned long long)psa->psa_effective_value,
427 (unsigned long long)intval, setpoint);
428 }
429 }
430 #endif
431
432 /*
433 * Unregister this callback. Return 0 on success, ENOENT if ddname is
434 * invalid, ENOMSG if no matching callback registered.
435 */
436 int
437 dsl_prop_unregister(dsl_dataset_t *ds, const char *propname,
438 dsl_prop_changed_cb_t *callback, void *cbarg)
439 {
440 dsl_dir_t *dd = ds->ds_dir;
441 dsl_prop_cb_record_t *cbr;
442
443 mutex_enter(&dd->dd_lock);
444 for (cbr = list_head(&dd->dd_prop_cbs);
445 cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) {
446 if (cbr->cbr_ds == ds &&
447 cbr->cbr_func == callback &&
448 cbr->cbr_arg == cbarg &&
449 strcmp(cbr->cbr_propname, propname) == 0)
450 break;
451 }
452
453 if (cbr == NULL) {
454 mutex_exit(&dd->dd_lock);
455 return (ENOMSG);
456 }
457
458 list_remove(&dd->dd_prop_cbs, cbr);
459 mutex_exit(&dd->dd_lock);
460 kmem_free((void*)cbr->cbr_propname, strlen(cbr->cbr_propname)+1);
461 kmem_free(cbr, sizeof (dsl_prop_cb_record_t));
462
463 return (0);
464 }
465
466 /*
467 * Return the number of callbacks that are registered for this dataset.
468 */
469 int
470 dsl_prop_numcb(dsl_dataset_t *ds)
471 {
472 dsl_dir_t *dd = ds->ds_dir;
473 dsl_prop_cb_record_t *cbr;
474 int num = 0;
475
476 mutex_enter(&dd->dd_lock);
477 for (cbr = list_head(&dd->dd_prop_cbs);
478 cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) {
479 if (cbr->cbr_ds == ds)
480 num++;
481 }
482 mutex_exit(&dd->dd_lock);
483
484 return (num);
485 }
486
487 static void
488 dsl_prop_changed_notify(dsl_pool_t *dp, uint64_t ddobj,
489 const char *propname, uint64_t value, int first)
490 {
491 dsl_dir_t *dd;
492 dsl_prop_cb_record_t *cbr;
493 objset_t *mos = dp->dp_meta_objset;
494 zap_cursor_t zc;
495 zap_attribute_t *za;
496 int err;
497
498 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock));
499 err = dsl_dir_open_obj(dp, ddobj, NULL, FTAG, &dd);
500 if (err)
501 return;
502
503 if (!first) {
504 /*
505 * If the prop is set here, then this change is not
506 * being inherited here or below; stop the recursion.
507 */
508 err = zap_contains(mos, dd->dd_phys->dd_props_zapobj, propname);
509 if (err == 0) {
510 dsl_dir_close(dd, FTAG);
511 return;
512 }
513 ASSERT3U(err, ==, ENOENT);
514 }
515
516 mutex_enter(&dd->dd_lock);
517 for (cbr = list_head(&dd->dd_prop_cbs); cbr;
518 cbr = list_next(&dd->dd_prop_cbs, cbr)) {
519 uint64_t propobj = cbr->cbr_ds->ds_phys->ds_props_obj;
520
521 if (strcmp(cbr->cbr_propname, propname) != 0)
522 continue;
523
524 /*
525 * If the property is set on this ds, then it is not
526 * inherited here; don't call the callback.
527 */
528 if (propobj && 0 == zap_contains(mos, propobj, propname))
529 continue;
530
531 cbr->cbr_func(cbr->cbr_arg, value);
532 }
533 mutex_exit(&dd->dd_lock);
534
535 za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
536 for (zap_cursor_init(&zc, mos,
537 dd->dd_phys->dd_child_dir_zapobj);
538 zap_cursor_retrieve(&zc, za) == 0;
539 zap_cursor_advance(&zc)) {
540 dsl_prop_changed_notify(dp, za->za_first_integer,
541 propname, value, FALSE);
542 }
543 kmem_free(za, sizeof (zap_attribute_t));
544 zap_cursor_fini(&zc);
545 dsl_dir_close(dd, FTAG);
546 }
547
548 void
549 dsl_prop_set_sync(void *arg1, void *arg2, dmu_tx_t *tx)
550 {
551 dsl_dataset_t *ds = arg1;
552 dsl_prop_setarg_t *psa = arg2;
553 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
554 uint64_t zapobj, intval, dummy;
555 int isint;
556 char valbuf[32];
557 char *valstr = NULL;
558 char *inheritstr;
559 char *recvdstr;
560 char *tbuf = NULL;
561 int err;
562 uint64_t version = spa_version(ds->ds_dir->dd_pool->dp_spa);
563 const char *propname = psa->psa_name;
564 zprop_source_t source = psa->psa_source;
565
566 isint = (dodefault(propname, 8, 1, &intval) == 0);
567
568 if (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds)) {
569 ASSERT(version >= SPA_VERSION_SNAP_PROPS);
570 if (ds->ds_phys->ds_props_obj == 0) {
571 dmu_buf_will_dirty(ds->ds_dbuf, tx);
572 ds->ds_phys->ds_props_obj =
573 zap_create(mos,
574 DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
575 }
576 zapobj = ds->ds_phys->ds_props_obj;
577 } else {
578 zapobj = ds->ds_dir->dd_phys->dd_props_zapobj;
579 }
580
581 if (version < SPA_VERSION_RECVD_PROPS) {
582 zfs_prop_t prop = zfs_name_to_prop(propname);
583 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION)
584 return;
585
586 if (source & ZPROP_SRC_NONE)
587 source = ZPROP_SRC_NONE;
588 else if (source & ZPROP_SRC_RECEIVED)
589 source = ZPROP_SRC_LOCAL;
590 }
591
592 inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
593 recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
594
595 switch (source) {
596 case ZPROP_SRC_NONE:
597 /*
598 * revert to received value, if any (inherit -S)
599 * - remove propname
600 * - remove propname$inherit
601 */
602 err = zap_remove(mos, zapobj, propname, tx);
603 ASSERT(err == 0 || err == ENOENT);
604 err = zap_remove(mos, zapobj, inheritstr, tx);
605 ASSERT(err == 0 || err == ENOENT);
606 break;
607 case ZPROP_SRC_LOCAL:
608 /*
609 * remove propname$inherit
610 * set propname -> value
611 */
612 err = zap_remove(mos, zapobj, inheritstr, tx);
613 ASSERT(err == 0 || err == ENOENT);
614 VERIFY(0 == zap_update(mos, zapobj, propname,
615 psa->psa_intsz, psa->psa_numints, psa->psa_value, tx));
616 break;
617 case ZPROP_SRC_INHERITED:
618 /*
619 * explicitly inherit
620 * - remove propname
621 * - set propname$inherit
622 */
623 err = zap_remove(mos, zapobj, propname, tx);
624 ASSERT(err == 0 || err == ENOENT);
625 if (version >= SPA_VERSION_RECVD_PROPS &&
626 dsl_prop_get_ds(ds, ZPROP_HAS_RECVD, 8, 1, &dummy,
627 NULL) == 0) {
628 dummy = 0;
629 err = zap_update(mos, zapobj, inheritstr,
630 8, 1, &dummy, tx);
631 ASSERT(err == 0);
632 }
633 break;
634 case ZPROP_SRC_RECEIVED:
635 /*
636 * set propname$recvd -> value
637 */
638 err = zap_update(mos, zapobj, recvdstr,
639 psa->psa_intsz, psa->psa_numints, psa->psa_value, tx);
640 ASSERT(err == 0);
641 break;
642 case (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED):
643 /*
644 * clear local and received settings
645 * - remove propname
646 * - remove propname$inherit
647 * - remove propname$recvd
648 */
649 err = zap_remove(mos, zapobj, propname, tx);
650 ASSERT(err == 0 || err == ENOENT);
651 err = zap_remove(mos, zapobj, inheritstr, tx);
652 ASSERT(err == 0 || err == ENOENT);
653 /* FALLTHRU */
654 case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
655 /*
656 * remove propname$recvd
657 */
658 err = zap_remove(mos, zapobj, recvdstr, tx);
659 ASSERT(err == 0 || err == ENOENT);
660 break;
661 default:
662 cmn_err(CE_PANIC, "unexpected property source: %d", source);
663 }
664
665 strfree(inheritstr);
666 strfree(recvdstr);
667
668 if (isint) {
669 VERIFY(0 == dsl_prop_get_ds(ds, propname, 8, 1, &intval, NULL));
670
671 if (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds)) {
672 dsl_prop_cb_record_t *cbr;
673 /*
674 * It's a snapshot; nothing can inherit this
675 * property, so just look for callbacks on this
676 * ds here.
677 */
678 mutex_enter(&ds->ds_dir->dd_lock);
679 for (cbr = list_head(&ds->ds_dir->dd_prop_cbs); cbr;
680 cbr = list_next(&ds->ds_dir->dd_prop_cbs, cbr)) {
681 if (cbr->cbr_ds == ds &&
682 strcmp(cbr->cbr_propname, propname) == 0)
683 cbr->cbr_func(cbr->cbr_arg, intval);
684 }
685 mutex_exit(&ds->ds_dir->dd_lock);
686 } else {
687 dsl_prop_changed_notify(ds->ds_dir->dd_pool,
688 ds->ds_dir->dd_object, propname, intval, TRUE);
689 }
690
691 (void) snprintf(valbuf, sizeof (valbuf),
692 "%lld", (longlong_t)intval);
693 valstr = valbuf;
694 } else {
695 if (source == ZPROP_SRC_LOCAL) {
696 valstr = (char *)psa->psa_value;
697 } else {
698 tbuf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
699 if (dsl_prop_get_ds(ds, propname, 1,
700 ZAP_MAXVALUELEN, tbuf, NULL) == 0)
701 valstr = tbuf;
702 }
703 }
704
705 spa_history_log_internal((source == ZPROP_SRC_NONE ||
706 source == ZPROP_SRC_INHERITED) ? LOG_DS_INHERIT :
707 LOG_DS_PROPSET, ds->ds_dir->dd_pool->dp_spa, tx,
708 "%s=%s dataset = %llu", propname,
709 (valstr == NULL ? "" : valstr), ds->ds_object);
710
711 if (tbuf != NULL)
712 kmem_free(tbuf, ZAP_MAXVALUELEN);
713 }
714
715 void
716 dsl_props_set_sync(void *arg1, void *arg2, dmu_tx_t *tx)
717 {
718 dsl_dataset_t *ds = arg1;
719 dsl_props_arg_t *pa = arg2;
720 nvlist_t *props = pa->pa_props;
721 dsl_prop_setarg_t psa;
722 nvpair_t *elem = NULL;
723
724 psa.psa_source = pa->pa_source;
725
726 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
727 nvpair_t *pair = elem;
728
729 psa.psa_name = nvpair_name(pair);
730
731 if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
732 /*
733 * dsl_prop_get_all_impl() returns properties in this
734 * format.
735 */
736 nvlist_t *attrs;
737 VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
738 VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
739 &pair) == 0);
740 }
741
742 if (nvpair_type(pair) == DATA_TYPE_STRING) {
743 VERIFY(nvpair_value_string(pair,
744 (char **)&psa.psa_value) == 0);
745 psa.psa_intsz = 1;
746 psa.psa_numints = strlen(psa.psa_value) + 1;
747 } else {
748 uint64_t intval;
749 VERIFY(nvpair_value_uint64(pair, &intval) == 0);
750 psa.psa_intsz = sizeof (intval);
751 psa.psa_numints = 1;
752 psa.psa_value = &intval;
753 }
754 dsl_prop_set_sync(ds, &psa, tx);
755 }
756 }
757
758 void
759 dsl_dir_prop_set_uint64_sync(dsl_dir_t *dd, const char *name, uint64_t val,
760 dmu_tx_t *tx)
761 {
762 objset_t *mos = dd->dd_pool->dp_meta_objset;
763 uint64_t zapobj = dd->dd_phys->dd_props_zapobj;
764
765 ASSERT(dmu_tx_is_syncing(tx));
766
767 VERIFY(0 == zap_update(mos, zapobj, name, sizeof (val), 1, &val, tx));
768
769 dsl_prop_changed_notify(dd->dd_pool, dd->dd_object, name, val, TRUE);
770
771 spa_history_log_internal(LOG_DS_PROPSET, dd->dd_pool->dp_spa, tx,
772 "%s=%llu dataset = %llu", name, (u_longlong_t)val,
773 dd->dd_phys->dd_head_dataset_obj);
774 }
775
776 int
777 dsl_prop_set(const char *dsname, const char *propname, zprop_source_t source,
778 int intsz, int numints, const void *buf)
779 {
780 dsl_dataset_t *ds;
781 uint64_t version;
782 int err;
783 dsl_prop_setarg_t psa;
784
785 /*
786 * We must do these checks before we get to the syncfunc, since
787 * it can't fail.
788 */
789 if (strlen(propname) >= ZAP_MAXNAMELEN)
790 return (ENAMETOOLONG);
791
792 err = dsl_dataset_hold(dsname, FTAG, &ds);
793 if (err)
794 return (err);
795
796 version = spa_version(ds->ds_dir->dd_pool->dp_spa);
797 if (intsz * numints >= (version < SPA_VERSION_STMF_PROP ?
798 ZAP_OLDMAXVALUELEN : ZAP_MAXVALUELEN)) {
799 dsl_dataset_rele(ds, FTAG);
800 return (E2BIG);
801 }
802 if (dsl_dataset_is_snapshot(ds) &&
803 version < SPA_VERSION_SNAP_PROPS) {
804 dsl_dataset_rele(ds, FTAG);
805 return (ENOTSUP);
806 }
807
808 psa.psa_name = propname;
809 psa.psa_source = source;
810 psa.psa_intsz = intsz;
811 psa.psa_numints = numints;
812 psa.psa_value = buf;
813 psa.psa_effective_value = -1ULL;
814
815 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
816 NULL, dsl_prop_set_sync, ds, &psa, 2);
817
818 dsl_dataset_rele(ds, FTAG);
819 return (err);
820 }
821
822 int
823 dsl_props_set(const char *dsname, zprop_source_t source, nvlist_t *props)
824 {
825 dsl_dataset_t *ds;
826 uint64_t version;
827 nvpair_t *elem = NULL;
828 dsl_props_arg_t pa;
829 int err;
830
831 if (err = dsl_dataset_hold(dsname, FTAG, &ds))
832 return (err);
833 /*
834 * Do these checks before the syncfunc, since it can't fail.
835 */
836 version = spa_version(ds->ds_dir->dd_pool->dp_spa);
837 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
838 if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
839 dsl_dataset_rele(ds, FTAG);
840 return (ENAMETOOLONG);
841 }
842 if (nvpair_type(elem) == DATA_TYPE_STRING) {
843 char *valstr;
844 VERIFY(nvpair_value_string(elem, &valstr) == 0);
845 if (strlen(valstr) >= (version <
846 SPA_VERSION_STMF_PROP ?
847 ZAP_OLDMAXVALUELEN : ZAP_MAXVALUELEN)) {
848 dsl_dataset_rele(ds, FTAG);
849 return (E2BIG);
850 }
851 }
852 }
853
854 if (dsl_dataset_is_snapshot(ds) &&
855 version < SPA_VERSION_SNAP_PROPS) {
856 dsl_dataset_rele(ds, FTAG);
857 return (ENOTSUP);
858 }
859
860 pa.pa_props = props;
861 pa.pa_source = source;
862
863 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
864 NULL, dsl_props_set_sync, ds, &pa, 2);
865
866 dsl_dataset_rele(ds, FTAG);
867 return (err);
868 }
869
870 typedef enum dsl_prop_getflags {
871 DSL_PROP_GET_INHERITING = 0x1, /* searching parent of target ds */
872 DSL_PROP_GET_SNAPSHOT = 0x2, /* snapshot dataset */
873 DSL_PROP_GET_LOCAL = 0x4, /* local properties */
874 DSL_PROP_GET_RECEIVED = 0x8 /* received properties */
875 } dsl_prop_getflags_t;
876
877 static int
878 dsl_prop_get_all_impl(objset_t *mos, uint64_t propobj,
879 const char *setpoint, dsl_prop_getflags_t flags, nvlist_t *nv)
880 {
881 zap_cursor_t zc;
882 zap_attribute_t za;
883 int err = 0;
884
885 for (zap_cursor_init(&zc, mos, propobj);
886 (err = zap_cursor_retrieve(&zc, &za)) == 0;
887 zap_cursor_advance(&zc)) {
888 nvlist_t *propval;
889 zfs_prop_t prop;
890 char buf[ZAP_MAXNAMELEN];
891 char *valstr;
892 const char *suffix;
893 const char *propname;
894 const char *source;
895
896 suffix = strchr(za.za_name, '$');
897
898 if (suffix == NULL) {
899 /*
900 * Skip local properties if we only want received
901 * properties.
902 */
903 if (flags & DSL_PROP_GET_RECEIVED)
904 continue;
905
906 propname = za.za_name;
907 source = setpoint;
908 } else if (strcmp(suffix, ZPROP_INHERIT_SUFFIX) == 0) {
909 /* Skip explicitly inherited entries. */
910 continue;
911 } else if (strcmp(suffix, ZPROP_RECVD_SUFFIX) == 0) {
912 if (flags & DSL_PROP_GET_LOCAL)
913 continue;
914
915 (void) strncpy(buf, za.za_name, (suffix - za.za_name));
916 buf[suffix - za.za_name] = '\0';
917 propname = buf;
918
919 if (!(flags & DSL_PROP_GET_RECEIVED)) {
920 /* Skip if locally overridden. */
921 err = zap_contains(mos, propobj, propname);
922 if (err == 0)
923 continue;
924 if (err != ENOENT)
925 break;
926
927 /* Skip if explicitly inherited. */
928 valstr = kmem_asprintf("%s%s", propname,
929 ZPROP_INHERIT_SUFFIX);
930 err = zap_contains(mos, propobj, valstr);
931 strfree(valstr);
932 if (err == 0)
933 continue;
934 if (err != ENOENT)
935 break;
936 }
937
938 source = ((flags & DSL_PROP_GET_INHERITING) ?
939 setpoint : ZPROP_SOURCE_VAL_RECVD);
940 } else {
941 /*
942 * For backward compatibility, skip suffixes we don't
943 * recognize.
944 */
945 continue;
946 }
947
948 prop = zfs_name_to_prop(propname);
949
950 /* Skip non-inheritable properties. */
951 if ((flags & DSL_PROP_GET_INHERITING) && prop != ZPROP_INVAL &&
952 !zfs_prop_inheritable(prop))
953 continue;
954
955 /* Skip properties not valid for this type. */
956 if ((flags & DSL_PROP_GET_SNAPSHOT) && prop != ZPROP_INVAL &&
957 !zfs_prop_valid_for_type(prop, ZFS_TYPE_SNAPSHOT))
958 continue;
959
960 /* Skip properties already defined. */
961 if (nvlist_exists(nv, propname))
962 continue;
963
964 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
965 if (za.za_integer_length == 1) {
966 /*
967 * String property
968 */
969 char *tmp = kmem_alloc(za.za_num_integers,
970 KM_SLEEP);
971 err = zap_lookup(mos, propobj,
972 za.za_name, 1, za.za_num_integers, tmp);
973 if (err != 0) {
974 kmem_free(tmp, za.za_num_integers);
975 break;
976 }
977 VERIFY(nvlist_add_string(propval, ZPROP_VALUE,
978 tmp) == 0);
979 kmem_free(tmp, za.za_num_integers);
980 } else {
981 /*
982 * Integer property
983 */
984 ASSERT(za.za_integer_length == 8);
985 (void) nvlist_add_uint64(propval, ZPROP_VALUE,
986 za.za_first_integer);
987 }
988
989 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, source) == 0);
990 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
991 nvlist_free(propval);
992 }
993 zap_cursor_fini(&zc);
994 if (err == ENOENT)
995 err = 0;
996 return (err);
997 }
998
999 /*
1000 * Iterate over all properties for this dataset and return them in an nvlist.
1001 */
1002 static int
1003 dsl_prop_get_all_ds(dsl_dataset_t *ds, nvlist_t **nvp,
1004 dsl_prop_getflags_t flags)
1005 {
1006 dsl_dir_t *dd = ds->ds_dir;
1007 dsl_pool_t *dp = dd->dd_pool;
1008 objset_t *mos = dp->dp_meta_objset;
1009 int err = 0;
1010 char setpoint[MAXNAMELEN];
1011
1012 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1013
1014 if (dsl_dataset_is_snapshot(ds))
1015 flags |= DSL_PROP_GET_SNAPSHOT;
1016
1017 rw_enter(&dp->dp_config_rwlock, RW_READER);
1018
1019 if (ds->ds_phys->ds_props_obj != 0) {
1020 ASSERT(flags & DSL_PROP_GET_SNAPSHOT);
1021 dsl_dataset_name(ds, setpoint);
1022 err = dsl_prop_get_all_impl(mos, ds->ds_phys->ds_props_obj,
1023 setpoint, flags, *nvp);
1024 if (err)
1025 goto out;
1026 }
1027
1028 for (; dd != NULL; dd = dd->dd_parent) {
1029 if (dd != ds->ds_dir || (flags & DSL_PROP_GET_SNAPSHOT)) {
1030 if (flags & (DSL_PROP_GET_LOCAL |
1031 DSL_PROP_GET_RECEIVED))
1032 break;
1033 flags |= DSL_PROP_GET_INHERITING;
1034 }
1035 dsl_dir_name(dd, setpoint);
1036 err = dsl_prop_get_all_impl(mos, dd->dd_phys->dd_props_zapobj,
1037 setpoint, flags, *nvp);
1038 if (err)
1039 break;
1040 }
1041 out:
1042 rw_exit(&dp->dp_config_rwlock);
1043 return (err);
1044 }
1045
1046 boolean_t
1047 dsl_prop_get_hasrecvd(objset_t *os)
1048 {
1049 dsl_dataset_t *ds = os->os_dsl_dataset;
1050 int rc;
1051 uint64_t dummy;
1052
1053 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
1054 rc = dsl_prop_get_ds(ds, ZPROP_HAS_RECVD, 8, 1, &dummy, NULL);
1055 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
1056 ASSERT(rc != 0 || spa_version(os->os_spa) >= SPA_VERSION_RECVD_PROPS);
1057 return (rc == 0);
1058 }
1059
1060 static void
1061 dsl_prop_set_hasrecvd_impl(objset_t *os, zprop_source_t source)
1062 {
1063 dsl_dataset_t *ds = os->os_dsl_dataset;
1064 uint64_t dummy = 0;
1065 dsl_prop_setarg_t psa;
1066
1067 if (spa_version(os->os_spa) < SPA_VERSION_RECVD_PROPS)
1068 return;
1069
1070 dsl_prop_setarg_init_uint64(&psa, ZPROP_HAS_RECVD, source, &dummy);
1071
1072 (void) dsl_sync_task_do(ds->ds_dir->dd_pool, NULL,
1073 dsl_prop_set_sync, ds, &psa, 2);
1074 }
1075
1076 /*
1077 * Call after successfully receiving properties to ensure that only the first
1078 * receive on or after SPA_VERSION_RECVD_PROPS blows away local properties.
1079 */
1080 void
1081 dsl_prop_set_hasrecvd(objset_t *os)
1082 {
1083 if (dsl_prop_get_hasrecvd(os)) {
1084 ASSERT(spa_version(os->os_spa) >= SPA_VERSION_RECVD_PROPS);
1085 return;
1086 }
1087 dsl_prop_set_hasrecvd_impl(os, ZPROP_SRC_LOCAL);
1088 }
1089
1090 void
1091 dsl_prop_unset_hasrecvd(objset_t *os)
1092 {
1093 dsl_prop_set_hasrecvd_impl(os, ZPROP_SRC_NONE);
1094 }
1095
1096 int
1097 dsl_prop_get_all(objset_t *os, nvlist_t **nvp)
1098 {
1099 return (dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, 0));
1100 }
1101
1102 int
1103 dsl_prop_get_received(objset_t *os, nvlist_t **nvp)
1104 {
1105 /*
1106 * Received properties are not distinguishable from local properties
1107 * until the dataset has received properties on or after
1108 * SPA_VERSION_RECVD_PROPS.
1109 */
1110 dsl_prop_getflags_t flags = (dsl_prop_get_hasrecvd(os) ?
1111 DSL_PROP_GET_RECEIVED : DSL_PROP_GET_LOCAL);
1112 return (dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, flags));
1113 }
1114
1115 void
1116 dsl_prop_nvlist_add_uint64(nvlist_t *nv, zfs_prop_t prop, uint64_t value)
1117 {
1118 nvlist_t *propval;
1119 const char *propname = zfs_prop_to_name(prop);
1120 uint64_t default_value;
1121
1122 if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1123 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1124 return;
1125 }
1126
1127 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1128 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1129 /* Indicate the default source if we can. */
1130 if (dodefault(propname, 8, 1, &default_value) == 0 &&
1131 value == default_value) {
1132 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, "") == 0);
1133 }
1134 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1135 nvlist_free(propval);
1136 }
1137
1138 void
1139 dsl_prop_nvlist_add_string(nvlist_t *nv, zfs_prop_t prop, const char *value)
1140 {
1141 nvlist_t *propval;
1142 const char *propname = zfs_prop_to_name(prop);
1143
1144 if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1145 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1146 return;
1147 }
1148
1149 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1150 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1151 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1152 nvlist_free(propval);
1153 }
Unleashed OS