1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012, 2015 by Delphix. All rights reserved.
24 * Copyright (c) 2013 Martin Matuska. All rights reserved.
25 * Copyright 2019 Joyent, Inc.
26 */
27
28 #include <sys/zfs_context.h>
29 #include <sys/dmu.h>
30 #include <sys/dmu_objset.h>
31 #include <sys/dmu_tx.h>
32 #include <sys/dsl_dataset.h>
33 #include <sys/dsl_dir.h>
34 #include <sys/dsl_prop.h>
35 #include <sys/dsl_synctask.h>
36 #include <sys/spa.h>
37 #include <sys/zap.h>
38 #include <sys/fs/zfs.h>
39
40 #include "zfs_prop.h"
41
42 #define ZPROP_INHERIT_SUFFIX "$inherit"
43 #define ZPROP_RECVD_SUFFIX "$recvd"
44
45 static int
dodefault(zfs_prop_t prop,int intsz,int numints,void * buf)46 dodefault(zfs_prop_t prop, int intsz, int numints, void *buf)
47 {
48 /*
49 * The setonce properties are read-only, BUT they still
50 * have a default value that can be used as the initial
51 * value.
52 */
53 if (prop == ZPROP_INVAL ||
54 (zfs_prop_readonly(prop) && !zfs_prop_setonce(prop)))
55 return (SET_ERROR(ENOENT));
56
57 if (zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
58 if (intsz != 1)
59 return (SET_ERROR(EOVERFLOW));
60 (void) strncpy(buf, zfs_prop_default_string(prop),
61 numints);
62 } else {
63 if (intsz != 8 || numints < 1)
64 return (SET_ERROR(EOVERFLOW));
65
66 *(uint64_t *)buf = zfs_prop_default_numeric(prop);
67 }
68
69 return (0);
70 }
71
72 int
dsl_prop_get_dd(dsl_dir_t * dd,const char * propname,int intsz,int numints,void * buf,char * setpoint,boolean_t snapshot)73 dsl_prop_get_dd(dsl_dir_t *dd, const char *propname,
74 int intsz, int numints, void *buf, char *setpoint, boolean_t snapshot)
75 {
76 int err;
77 dsl_dir_t *target = dd;
78 objset_t *mos = dd->dd_pool->dp_meta_objset;
79 zfs_prop_t prop;
80 boolean_t inheritable;
81 boolean_t inheriting = B_FALSE;
82 char *inheritstr;
83 char *recvdstr;
84
85 ASSERT(dsl_pool_config_held(dd->dd_pool));
86
87 if (setpoint)
88 setpoint[0] = '\0';
89
90 prop = zfs_name_to_prop(propname);
91 inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
92 inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
93 recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
94
95 /*
96 * Note: dd may become NULL, therefore we shouldn't dereference it
97 * after this loop.
98 */
99 for (; dd != NULL; dd = dd->dd_parent) {
100 if (dd != target || snapshot) {
101 if (!inheritable) {
102 err = SET_ERROR(ENOENT);
103 break;
104 }
105 inheriting = B_TRUE;
106 }
107
108 /* Check for a local value. */
109 err = zap_lookup(mos, dsl_dir_phys(dd)->dd_props_zapobj,
110 propname, intsz, numints, buf);
111 if (err != ENOENT) {
112 if (setpoint != NULL && err == 0)
113 dsl_dir_name(dd, setpoint);
114 break;
115 }
116
117 /*
118 * Skip the check for a received value if there is an explicit
119 * inheritance entry.
120 */
121 err = zap_contains(mos, dsl_dir_phys(dd)->dd_props_zapobj,
122 inheritstr);
123 if (err != 0 && err != ENOENT)
124 break;
125
126 if (err == ENOENT) {
127 /* Check for a received value. */
128 err = zap_lookup(mos, dsl_dir_phys(dd)->dd_props_zapobj,
129 recvdstr, intsz, numints, buf);
130 if (err != ENOENT) {
131 if (setpoint != NULL && err == 0) {
132 if (inheriting) {
133 dsl_dir_name(dd, setpoint);
134 } else {
135 (void) strlcpy(setpoint,
136 ZPROP_SOURCE_VAL_RECVD,
137 MAXNAMELEN);
138 }
139 }
140 break;
141 }
142 }
143
144 /*
145 * If we found an explicit inheritance entry, err is zero even
146 * though we haven't yet found the value, so reinitializing err
147 * at the end of the loop (instead of at the beginning) ensures
148 * that err has a valid post-loop value.
149 */
150 err = SET_ERROR(ENOENT);
151 }
152
153 if (err == ENOENT)
154 err = dodefault(prop, intsz, numints, buf);
155
156 kmem_strfree(inheritstr);
157 kmem_strfree(recvdstr);
158
159 return (err);
160 }
161
162 int
dsl_prop_get_ds(dsl_dataset_t * ds,const char * propname,int intsz,int numints,void * buf,char * setpoint)163 dsl_prop_get_ds(dsl_dataset_t *ds, const char *propname,
164 int intsz, int numints, void *buf, char *setpoint)
165 {
166 zfs_prop_t prop = zfs_name_to_prop(propname);
167 boolean_t inheritable;
168 uint64_t zapobj;
169
170 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
171 inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
172 zapobj = dsl_dataset_phys(ds)->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(ds->ds_is_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 kmem_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 kmem_strfree(recvdstr);
208 if (err != ENOENT) {
209 if (setpoint != NULL && err == 0)
210 (void) strlcpy(setpoint,
211 ZPROP_SOURCE_VAL_RECVD,
212 MAXNAMELEN);
213 return (err);
214 }
215 }
216 }
217
218 return (dsl_prop_get_dd(ds->ds_dir, propname,
219 intsz, numints, buf, setpoint, ds->ds_is_snapshot));
220 }
221
222 static dsl_prop_record_t *
dsl_prop_record_find(dsl_dir_t * dd,const char * propname)223 dsl_prop_record_find(dsl_dir_t *dd, const char *propname)
224 {
225 dsl_prop_record_t *pr = NULL;
226
227 ASSERT(MUTEX_HELD(&dd->dd_lock));
228
229 for (pr = list_head(&dd->dd_props);
230 pr != NULL; pr = list_next(&dd->dd_props, pr)) {
231 if (strcmp(pr->pr_propname, propname) == 0)
232 break;
233 }
234
235 return (pr);
236 }
237
238 static dsl_prop_record_t *
dsl_prop_record_create(dsl_dir_t * dd,const char * propname)239 dsl_prop_record_create(dsl_dir_t *dd, const char *propname)
240 {
241 dsl_prop_record_t *pr;
242
243 ASSERT(MUTEX_HELD(&dd->dd_lock));
244
245 pr = kmem_alloc(sizeof (dsl_prop_record_t), KM_SLEEP);
246 pr->pr_propname = spa_strdup(propname);
247 list_create(&pr->pr_cbs, sizeof (dsl_prop_cb_record_t),
248 offsetof(dsl_prop_cb_record_t, cbr_pr_node));
249 list_insert_head(&dd->dd_props, pr);
250
251 return (pr);
252 }
253
254 void
dsl_prop_init(dsl_dir_t * dd)255 dsl_prop_init(dsl_dir_t *dd)
256 {
257 list_create(&dd->dd_props, sizeof (dsl_prop_record_t),
258 offsetof(dsl_prop_record_t, pr_node));
259 }
260
261 void
dsl_prop_fini(dsl_dir_t * dd)262 dsl_prop_fini(dsl_dir_t *dd)
263 {
264 dsl_prop_record_t *pr;
265
266 while ((pr = list_remove_head(&dd->dd_props)) != NULL) {
267 list_destroy(&pr->pr_cbs);
268 spa_strfree((char *)pr->pr_propname);
269 kmem_free(pr, sizeof (dsl_prop_record_t));
270 }
271 list_destroy(&dd->dd_props);
272 }
273
274 /*
275 * Register interest in the named property. We'll call the callback
276 * once to notify it of the current property value, and again each time
277 * the property changes, until this callback is unregistered.
278 *
279 * Return 0 on success, errno if the prop is not an integer value.
280 */
281 int
dsl_prop_register(dsl_dataset_t * ds,const char * propname,dsl_prop_changed_cb_t * callback,void * cbarg)282 dsl_prop_register(dsl_dataset_t *ds, const char *propname,
283 dsl_prop_changed_cb_t *callback, void *cbarg)
284 {
285 dsl_dir_t *dd = ds->ds_dir;
286 uint64_t value;
287 dsl_prop_record_t *pr;
288 dsl_prop_cb_record_t *cbr;
289 int err;
290 dsl_pool_t *dp __maybe_unused = dd->dd_pool;
291
292 ASSERT(dsl_pool_config_held(dp));
293
294 err = dsl_prop_get_int_ds(ds, propname, &value);
295 if (err != 0)
296 return (err);
297
298 cbr = kmem_alloc(sizeof (dsl_prop_cb_record_t), KM_SLEEP);
299 cbr->cbr_ds = ds;
300 cbr->cbr_func = callback;
301 cbr->cbr_arg = cbarg;
302
303 mutex_enter(&dd->dd_lock);
304 pr = dsl_prop_record_find(dd, propname);
305 if (pr == NULL)
306 pr = dsl_prop_record_create(dd, propname);
307 cbr->cbr_pr = pr;
308 list_insert_head(&pr->pr_cbs, cbr);
309 list_insert_head(&ds->ds_prop_cbs, cbr);
310 mutex_exit(&dd->dd_lock);
311
312 cbr->cbr_func(cbr->cbr_arg, value);
313 return (0);
314 }
315
316 int
dsl_prop_get(const char * dsname,const char * propname,int intsz,int numints,void * buf,char * setpoint)317 dsl_prop_get(const char *dsname, const char *propname,
318 int intsz, int numints, void *buf, char *setpoint)
319 {
320 objset_t *os;
321 int error;
322
323 error = dmu_objset_hold(dsname, FTAG, &os);
324 if (error != 0)
325 return (error);
326
327 error = dsl_prop_get_ds(dmu_objset_ds(os), propname,
328 intsz, numints, buf, setpoint);
329
330 dmu_objset_rele(os, FTAG);
331 return (error);
332 }
333
334 /*
335 * Get the current property value. It may have changed by the time this
336 * function returns, so it is NOT safe to follow up with
337 * dsl_prop_register() and assume that the value has not changed in
338 * between.
339 *
340 * Return 0 on success, ENOENT if ddname is invalid.
341 */
342 int
dsl_prop_get_integer(const char * ddname,const char * propname,uint64_t * valuep,char * setpoint)343 dsl_prop_get_integer(const char *ddname, const char *propname,
344 uint64_t *valuep, char *setpoint)
345 {
346 return (dsl_prop_get(ddname, propname, 8, 1, valuep, setpoint));
347 }
348
349 int
dsl_prop_get_int_ds(dsl_dataset_t * ds,const char * propname,uint64_t * valuep)350 dsl_prop_get_int_ds(dsl_dataset_t *ds, const char *propname,
351 uint64_t *valuep)
352 {
353 return (dsl_prop_get_ds(ds, propname, 8, 1, valuep, NULL));
354 }
355
356 /*
357 * Predict the effective value of the given special property if it were set with
358 * the given value and source. This is not a general purpose function. It exists
359 * only to handle the special requirements of the quota and reservation
360 * properties. The fact that these properties are non-inheritable greatly
361 * simplifies the prediction logic.
362 *
363 * Returns 0 on success, a positive error code on failure, or -1 if called with
364 * a property not handled by this function.
365 */
366 int
dsl_prop_predict(dsl_dir_t * dd,const char * propname,zprop_source_t source,uint64_t value,uint64_t * newvalp)367 dsl_prop_predict(dsl_dir_t *dd, const char *propname,
368 zprop_source_t source, uint64_t value, uint64_t *newvalp)
369 {
370 zfs_prop_t prop = zfs_name_to_prop(propname);
371 objset_t *mos;
372 uint64_t zapobj;
373 uint64_t version;
374 char *recvdstr;
375 int err = 0;
376
377 switch (prop) {
378 case ZFS_PROP_QUOTA:
379 case ZFS_PROP_RESERVATION:
380 case ZFS_PROP_REFQUOTA:
381 case ZFS_PROP_REFRESERVATION:
382 break;
383 default:
384 return (-1);
385 }
386
387 mos = dd->dd_pool->dp_meta_objset;
388 zapobj = dsl_dir_phys(dd)->dd_props_zapobj;
389 recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
390
391 version = spa_version(dd->dd_pool->dp_spa);
392 if (version < SPA_VERSION_RECVD_PROPS) {
393 if (source & ZPROP_SRC_NONE)
394 source = ZPROP_SRC_NONE;
395 else if (source & ZPROP_SRC_RECEIVED)
396 source = ZPROP_SRC_LOCAL;
397 }
398
399 switch ((int)source) {
400 case ZPROP_SRC_NONE:
401 /* Revert to the received value, if any. */
402 err = zap_lookup(mos, zapobj, recvdstr, 8, 1, newvalp);
403 if (err == ENOENT)
404 *newvalp = 0;
405 break;
406 case ZPROP_SRC_LOCAL:
407 *newvalp = value;
408 break;
409 case ZPROP_SRC_RECEIVED:
410 /*
411 * If there's no local setting, then the new received value will
412 * be the effective value.
413 */
414 err = zap_lookup(mos, zapobj, propname, 8, 1, newvalp);
415 if (err == ENOENT)
416 *newvalp = value;
417 break;
418 case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
419 /*
420 * We're clearing the received value, so the local setting (if
421 * it exists) remains the effective value.
422 */
423 err = zap_lookup(mos, zapobj, propname, 8, 1, newvalp);
424 if (err == ENOENT)
425 *newvalp = 0;
426 break;
427 default:
428 panic("unexpected property source: %d", source);
429 }
430
431 kmem_strfree(recvdstr);
432
433 if (err == ENOENT)
434 return (0);
435
436 return (err);
437 }
438
439 /*
440 * Unregister this callback. Return 0 on success, ENOENT if ddname is
441 * invalid, or ENOMSG if no matching callback registered.
442 *
443 * NOTE: This function is no longer used internally but has been preserved
444 * to prevent breaking external consumers (Lustre, etc).
445 */
446 int
dsl_prop_unregister(dsl_dataset_t * ds,const char * propname,dsl_prop_changed_cb_t * callback,void * cbarg)447 dsl_prop_unregister(dsl_dataset_t *ds, const char *propname,
448 dsl_prop_changed_cb_t *callback, void *cbarg)
449 {
450 dsl_dir_t *dd = ds->ds_dir;
451 dsl_prop_cb_record_t *cbr;
452
453 mutex_enter(&dd->dd_lock);
454 for (cbr = list_head(&ds->ds_prop_cbs);
455 cbr; cbr = list_next(&ds->ds_prop_cbs, cbr)) {
456 if (cbr->cbr_ds == ds &&
457 cbr->cbr_func == callback &&
458 cbr->cbr_arg == cbarg &&
459 strcmp(cbr->cbr_pr->pr_propname, propname) == 0)
460 break;
461 }
462
463 if (cbr == NULL) {
464 mutex_exit(&dd->dd_lock);
465 return (SET_ERROR(ENOMSG));
466 }
467
468 list_remove(&ds->ds_prop_cbs, cbr);
469 list_remove(&cbr->cbr_pr->pr_cbs, cbr);
470 mutex_exit(&dd->dd_lock);
471 kmem_free(cbr, sizeof (dsl_prop_cb_record_t));
472
473 return (0);
474 }
475
476 /*
477 * Unregister all callbacks that are registered with the
478 * given callback argument.
479 */
480 void
dsl_prop_unregister_all(dsl_dataset_t * ds,void * cbarg)481 dsl_prop_unregister_all(dsl_dataset_t *ds, void *cbarg)
482 {
483 dsl_prop_cb_record_t *cbr, *next_cbr;
484
485 dsl_dir_t *dd = ds->ds_dir;
486
487 mutex_enter(&dd->dd_lock);
488 next_cbr = list_head(&ds->ds_prop_cbs);
489 while (next_cbr != NULL) {
490 cbr = next_cbr;
491 next_cbr = list_next(&ds->ds_prop_cbs, cbr);
492 if (cbr->cbr_arg == cbarg) {
493 list_remove(&ds->ds_prop_cbs, cbr);
494 list_remove(&cbr->cbr_pr->pr_cbs, cbr);
495 kmem_free(cbr, sizeof (dsl_prop_cb_record_t));
496 }
497 }
498 mutex_exit(&dd->dd_lock);
499 }
500
501 boolean_t
dsl_prop_hascb(dsl_dataset_t * ds)502 dsl_prop_hascb(dsl_dataset_t *ds)
503 {
504 return (!list_is_empty(&ds->ds_prop_cbs));
505 }
506
507 /* ARGSUSED */
508 static int
dsl_prop_notify_all_cb(dsl_pool_t * dp,dsl_dataset_t * ds,void * arg)509 dsl_prop_notify_all_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg)
510 {
511 dsl_dir_t *dd = ds->ds_dir;
512 dsl_prop_record_t *pr;
513 dsl_prop_cb_record_t *cbr;
514
515 mutex_enter(&dd->dd_lock);
516 for (pr = list_head(&dd->dd_props);
517 pr; pr = list_next(&dd->dd_props, pr)) {
518 for (cbr = list_head(&pr->pr_cbs); cbr;
519 cbr = list_next(&pr->pr_cbs, cbr)) {
520 uint64_t value;
521
522 /*
523 * Callback entries do not have holds on their
524 * datasets so that datasets with registered
525 * callbacks are still eligible for eviction.
526 * Unlike operations to update properties on a
527 * single dataset, we are performing a recursive
528 * descent of related head datasets. The caller
529 * of this function only has a dataset hold on
530 * the passed in head dataset, not the snapshots
531 * associated with this dataset. Without a hold,
532 * the dataset pointer within callback records
533 * for snapshots can be invalidated by eviction
534 * at any time.
535 *
536 * Use dsl_dataset_try_add_ref() to verify
537 * that the dataset for a snapshot has not
538 * begun eviction processing and to prevent
539 * eviction from occurring for the duration of
540 * the callback. If the hold attempt fails,
541 * this object is already being evicted and the
542 * callback can be safely ignored.
543 */
544 if (ds != cbr->cbr_ds &&
545 !dsl_dataset_try_add_ref(dp, cbr->cbr_ds, FTAG))
546 continue;
547
548 if (dsl_prop_get_ds(cbr->cbr_ds,
549 cbr->cbr_pr->pr_propname, sizeof (value), 1,
550 &value, NULL) == 0)
551 cbr->cbr_func(cbr->cbr_arg, value);
552
553 if (ds != cbr->cbr_ds)
554 dsl_dataset_rele(cbr->cbr_ds, FTAG);
555 }
556 }
557 mutex_exit(&dd->dd_lock);
558
559 return (0);
560 }
561
562 /*
563 * Update all property values for ddobj & its descendants. This is used
564 * when renaming the dir.
565 */
566 void
dsl_prop_notify_all(dsl_dir_t * dd)567 dsl_prop_notify_all(dsl_dir_t *dd)
568 {
569 dsl_pool_t *dp = dd->dd_pool;
570 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
571 (void) dmu_objset_find_dp(dp, dd->dd_object, dsl_prop_notify_all_cb,
572 NULL, DS_FIND_CHILDREN);
573 }
574
575 static void
dsl_prop_changed_notify(dsl_pool_t * dp,uint64_t ddobj,const char * propname,uint64_t value,int first)576 dsl_prop_changed_notify(dsl_pool_t *dp, uint64_t ddobj,
577 const char *propname, uint64_t value, int first)
578 {
579 dsl_dir_t *dd;
580 dsl_prop_record_t *pr;
581 dsl_prop_cb_record_t *cbr;
582 objset_t *mos = dp->dp_meta_objset;
583 zap_cursor_t zc;
584 zap_attribute_t *za;
585 int err;
586
587 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
588 err = dsl_dir_hold_obj(dp, ddobj, NULL, FTAG, &dd);
589 if (err)
590 return;
591
592 if (!first) {
593 /*
594 * If the prop is set here, then this change is not
595 * being inherited here or below; stop the recursion.
596 */
597 err = zap_contains(mos, dsl_dir_phys(dd)->dd_props_zapobj,
598 propname);
599 if (err == 0) {
600 dsl_dir_rele(dd, FTAG);
601 return;
602 }
603 ASSERT3U(err, ==, ENOENT);
604 }
605
606 mutex_enter(&dd->dd_lock);
607 pr = dsl_prop_record_find(dd, propname);
608 if (pr != NULL) {
609 for (cbr = list_head(&pr->pr_cbs); cbr;
610 cbr = list_next(&pr->pr_cbs, cbr)) {
611 uint64_t propobj;
612
613 /*
614 * cbr->cbr_ds may be invalidated due to eviction,
615 * requiring the use of dsl_dataset_try_add_ref().
616 * See comment block in dsl_prop_notify_all_cb()
617 * for details.
618 */
619 if (!dsl_dataset_try_add_ref(dp, cbr->cbr_ds, FTAG))
620 continue;
621
622 propobj = dsl_dataset_phys(cbr->cbr_ds)->ds_props_obj;
623
624 /*
625 * If the property is not set on this ds, then it is
626 * inherited here; call the callback.
627 */
628 if (propobj == 0 ||
629 zap_contains(mos, propobj, propname) != 0)
630 cbr->cbr_func(cbr->cbr_arg, value);
631
632 dsl_dataset_rele(cbr->cbr_ds, FTAG);
633 }
634 }
635 mutex_exit(&dd->dd_lock);
636
637 za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
638 for (zap_cursor_init(&zc, mos,
639 dsl_dir_phys(dd)->dd_child_dir_zapobj);
640 zap_cursor_retrieve(&zc, za) == 0;
641 zap_cursor_advance(&zc)) {
642 dsl_prop_changed_notify(dp, za->za_first_integer,
643 propname, value, FALSE);
644 }
645 kmem_free(za, sizeof (zap_attribute_t));
646 zap_cursor_fini(&zc);
647 dsl_dir_rele(dd, FTAG);
648 }
649
650 void
dsl_prop_set_sync_impl(dsl_dataset_t * ds,const char * propname,zprop_source_t source,int intsz,int numints,const void * value,dmu_tx_t * tx)651 dsl_prop_set_sync_impl(dsl_dataset_t *ds, const char *propname,
652 zprop_source_t source, int intsz, int numints, const void *value,
653 dmu_tx_t *tx)
654 {
655 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
656 uint64_t zapobj, intval, dummy, count;
657 int isint;
658 char valbuf[32];
659 const char *valstr = NULL;
660 char *inheritstr;
661 char *recvdstr;
662 char *tbuf = NULL;
663 int err;
664 uint64_t version = spa_version(ds->ds_dir->dd_pool->dp_spa);
665
666 isint = (dodefault(zfs_name_to_prop(propname), 8, 1, &intval) == 0);
667
668 if (ds->ds_is_snapshot) {
669 ASSERT(version >= SPA_VERSION_SNAP_PROPS);
670 if (dsl_dataset_phys(ds)->ds_props_obj == 0 &&
671 (source & ZPROP_SRC_NONE) == 0) {
672 dmu_buf_will_dirty(ds->ds_dbuf, tx);
673 dsl_dataset_phys(ds)->ds_props_obj =
674 zap_create(mos,
675 DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
676 }
677 zapobj = dsl_dataset_phys(ds)->ds_props_obj;
678 } else {
679 zapobj = dsl_dir_phys(ds->ds_dir)->dd_props_zapobj;
680 }
681
682 /* If we are removing objects from a non-existent ZAP just return */
683 if (zapobj == 0)
684 return;
685
686 if (version < SPA_VERSION_RECVD_PROPS) {
687 if (source & ZPROP_SRC_NONE)
688 source = ZPROP_SRC_NONE;
689 else if (source & ZPROP_SRC_RECEIVED)
690 source = ZPROP_SRC_LOCAL;
691 }
692
693 inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
694 recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
695
696 switch ((int)source) {
697 case ZPROP_SRC_NONE:
698 /*
699 * revert to received value, if any (inherit -S)
700 * - remove propname
701 * - remove propname$inherit
702 */
703 err = zap_remove(mos, zapobj, propname, tx);
704 ASSERT(err == 0 || err == ENOENT);
705 err = zap_remove(mos, zapobj, inheritstr, tx);
706 ASSERT(err == 0 || err == ENOENT);
707 break;
708 case ZPROP_SRC_LOCAL:
709 /*
710 * remove propname$inherit
711 * set propname -> value
712 */
713 err = zap_remove(mos, zapobj, inheritstr, tx);
714 ASSERT(err == 0 || err == ENOENT);
715 VERIFY0(zap_update(mos, zapobj, propname,
716 intsz, numints, value, tx));
717 break;
718 case ZPROP_SRC_INHERITED:
719 /*
720 * explicitly inherit
721 * - remove propname
722 * - set propname$inherit
723 */
724 err = zap_remove(mos, zapobj, propname, tx);
725 ASSERT(err == 0 || err == ENOENT);
726 if (version >= SPA_VERSION_RECVD_PROPS &&
727 dsl_prop_get_int_ds(ds, ZPROP_HAS_RECVD, &dummy) == 0) {
728 dummy = 0;
729 VERIFY0(zap_update(mos, zapobj, inheritstr,
730 8, 1, &dummy, tx));
731 }
732 break;
733 case ZPROP_SRC_RECEIVED:
734 /*
735 * set propname$recvd -> value
736 */
737 err = zap_update(mos, zapobj, recvdstr,
738 intsz, numints, value, tx);
739 ASSERT(err == 0);
740 break;
741 case (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED):
742 /*
743 * clear local and received settings
744 * - remove propname
745 * - remove propname$inherit
746 * - remove propname$recvd
747 */
748 err = zap_remove(mos, zapobj, propname, tx);
749 ASSERT(err == 0 || err == ENOENT);
750 err = zap_remove(mos, zapobj, inheritstr, tx);
751 ASSERT(err == 0 || err == ENOENT);
752 /* FALLTHRU */
753 case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
754 /*
755 * remove propname$recvd
756 */
757 err = zap_remove(mos, zapobj, recvdstr, tx);
758 ASSERT(err == 0 || err == ENOENT);
759 break;
760 default:
761 cmn_err(CE_PANIC, "unexpected property source: %d", source);
762 }
763
764 kmem_strfree(inheritstr);
765 kmem_strfree(recvdstr);
766
767 /*
768 * If we are left with an empty snap zap we can destroy it.
769 * This will prevent unnecessary calls to zap_lookup() in
770 * the "zfs list" and "zfs get" code paths.
771 */
772 if (ds->ds_is_snapshot &&
773 zap_count(mos, zapobj, &count) == 0 && count == 0) {
774 dmu_buf_will_dirty(ds->ds_dbuf, tx);
775 dsl_dataset_phys(ds)->ds_props_obj = 0;
776 zap_destroy(mos, zapobj, tx);
777 }
778
779 if (isint) {
780 VERIFY0(dsl_prop_get_int_ds(ds, propname, &intval));
781
782 if (ds->ds_is_snapshot) {
783 dsl_prop_cb_record_t *cbr;
784 /*
785 * It's a snapshot; nothing can inherit this
786 * property, so just look for callbacks on this
787 * ds here.
788 */
789 mutex_enter(&ds->ds_dir->dd_lock);
790 for (cbr = list_head(&ds->ds_prop_cbs); cbr;
791 cbr = list_next(&ds->ds_prop_cbs, cbr)) {
792 if (strcmp(cbr->cbr_pr->pr_propname,
793 propname) == 0)
794 cbr->cbr_func(cbr->cbr_arg, intval);
795 }
796 mutex_exit(&ds->ds_dir->dd_lock);
797 } else {
798 dsl_prop_changed_notify(ds->ds_dir->dd_pool,
799 ds->ds_dir->dd_object, propname, intval, TRUE);
800 }
801
802 (void) snprintf(valbuf, sizeof (valbuf),
803 "%lld", (longlong_t)intval);
804 valstr = valbuf;
805 } else {
806 if (source == ZPROP_SRC_LOCAL) {
807 valstr = value;
808 } else {
809 tbuf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
810 if (dsl_prop_get_ds(ds, propname, 1,
811 ZAP_MAXVALUELEN, tbuf, NULL) == 0)
812 valstr = tbuf;
813 }
814 }
815
816 spa_history_log_internal_ds(ds, (source == ZPROP_SRC_NONE ||
817 source == ZPROP_SRC_INHERITED) ? "inherit" : "set", tx,
818 "%s=%s", propname, (valstr == NULL ? "" : valstr));
819
820 if (tbuf != NULL)
821 kmem_free(tbuf, ZAP_MAXVALUELEN);
822 }
823
824 int
dsl_prop_set_int(const char * dsname,const char * propname,zprop_source_t source,uint64_t value)825 dsl_prop_set_int(const char *dsname, const char *propname,
826 zprop_source_t source, uint64_t value)
827 {
828 nvlist_t *nvl = fnvlist_alloc();
829 int error;
830
831 fnvlist_add_uint64(nvl, propname, value);
832 error = dsl_props_set(dsname, source, nvl);
833 fnvlist_free(nvl);
834 return (error);
835 }
836
837 int
dsl_prop_set_string(const char * dsname,const char * propname,zprop_source_t source,const char * value)838 dsl_prop_set_string(const char *dsname, const char *propname,
839 zprop_source_t source, const char *value)
840 {
841 nvlist_t *nvl = fnvlist_alloc();
842 int error;
843
844 fnvlist_add_string(nvl, propname, value);
845 error = dsl_props_set(dsname, source, nvl);
846 fnvlist_free(nvl);
847 return (error);
848 }
849
850 int
dsl_prop_inherit(const char * dsname,const char * propname,zprop_source_t source)851 dsl_prop_inherit(const char *dsname, const char *propname,
852 zprop_source_t source)
853 {
854 nvlist_t *nvl = fnvlist_alloc();
855 int error;
856
857 fnvlist_add_boolean(nvl, propname);
858 error = dsl_props_set(dsname, source, nvl);
859 fnvlist_free(nvl);
860 return (error);
861 }
862
863 int
dsl_props_set_check(void * arg,dmu_tx_t * tx)864 dsl_props_set_check(void *arg, dmu_tx_t *tx)
865 {
866 dsl_props_set_arg_t *dpsa = arg;
867 dsl_pool_t *dp = dmu_tx_pool(tx);
868 dsl_dataset_t *ds;
869 uint64_t version;
870 nvpair_t *elem = NULL;
871 int err;
872
873 err = dsl_dataset_hold(dp, dpsa->dpsa_dsname, FTAG, &ds);
874 if (err != 0)
875 return (err);
876
877 version = spa_version(ds->ds_dir->dd_pool->dp_spa);
878 while ((elem = nvlist_next_nvpair(dpsa->dpsa_props, elem)) != NULL) {
879 if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
880 dsl_dataset_rele(ds, FTAG);
881 return (SET_ERROR(ENAMETOOLONG));
882 }
883 if (nvpair_type(elem) == DATA_TYPE_STRING) {
884 char *valstr = fnvpair_value_string(elem);
885 if (strlen(valstr) >= (version <
886 SPA_VERSION_STMF_PROP ?
887 ZAP_OLDMAXVALUELEN : ZAP_MAXVALUELEN)) {
888 dsl_dataset_rele(ds, FTAG);
889 return (SET_ERROR(E2BIG));
890 }
891 }
892 }
893
894 if (ds->ds_is_snapshot && version < SPA_VERSION_SNAP_PROPS) {
895 dsl_dataset_rele(ds, FTAG);
896 return (SET_ERROR(ENOTSUP));
897 }
898 dsl_dataset_rele(ds, FTAG);
899 return (0);
900 }
901
902 void
dsl_props_set_sync_impl(dsl_dataset_t * ds,zprop_source_t source,nvlist_t * props,dmu_tx_t * tx)903 dsl_props_set_sync_impl(dsl_dataset_t *ds, zprop_source_t source,
904 nvlist_t *props, dmu_tx_t *tx)
905 {
906 nvpair_t *elem = NULL;
907
908 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
909 nvpair_t *pair = elem;
910 const char *name = nvpair_name(pair);
911
912 if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
913 /*
914 * This usually happens when we reuse the nvlist_t data
915 * returned by the counterpart dsl_prop_get_all_impl().
916 * For instance we do this to restore the original
917 * received properties when an error occurs in the
918 * zfs_ioc_recv() codepath.
919 */
920 nvlist_t *attrs = fnvpair_value_nvlist(pair);
921 pair = fnvlist_lookup_nvpair(attrs, ZPROP_VALUE);
922 }
923
924 if (nvpair_type(pair) == DATA_TYPE_STRING) {
925 const char *value = fnvpair_value_string(pair);
926 dsl_prop_set_sync_impl(ds, name,
927 source, 1, strlen(value) + 1, value, tx);
928 } else if (nvpair_type(pair) == DATA_TYPE_UINT64) {
929 uint64_t intval = fnvpair_value_uint64(pair);
930 dsl_prop_set_sync_impl(ds, name,
931 source, sizeof (intval), 1, &intval, tx);
932 } else if (nvpair_type(pair) == DATA_TYPE_BOOLEAN) {
933 dsl_prop_set_sync_impl(ds, name,
934 source, 0, 0, NULL, tx);
935 } else {
936 panic("invalid nvpair type");
937 }
938 }
939 }
940
941 void
dsl_props_set_sync(void * arg,dmu_tx_t * tx)942 dsl_props_set_sync(void *arg, dmu_tx_t *tx)
943 {
944 dsl_props_set_arg_t *dpsa = arg;
945 dsl_pool_t *dp = dmu_tx_pool(tx);
946 dsl_dataset_t *ds;
947
948 VERIFY0(dsl_dataset_hold(dp, dpsa->dpsa_dsname, FTAG, &ds));
949 dsl_props_set_sync_impl(ds, dpsa->dpsa_source, dpsa->dpsa_props, tx);
950 dsl_dataset_rele(ds, FTAG);
951 }
952
953 /*
954 * All-or-nothing; if any prop can't be set, nothing will be modified.
955 */
956 int
dsl_props_set(const char * dsname,zprop_source_t source,nvlist_t * props)957 dsl_props_set(const char *dsname, zprop_source_t source, nvlist_t *props)
958 {
959 dsl_props_set_arg_t dpsa;
960 int nblks = 0;
961
962 dpsa.dpsa_dsname = dsname;
963 dpsa.dpsa_source = source;
964 dpsa.dpsa_props = props;
965
966 /*
967 * If the source includes NONE, then we will only be removing entries
968 * from the ZAP object. In that case don't check for ENOSPC.
969 */
970 if ((source & ZPROP_SRC_NONE) == 0)
971 nblks = 2 * fnvlist_num_pairs(props);
972
973 return (dsl_sync_task(dsname, dsl_props_set_check, dsl_props_set_sync,
974 &dpsa, nblks, ZFS_SPACE_CHECK_RESERVED));
975 }
976
977 typedef enum dsl_prop_getflags {
978 DSL_PROP_GET_INHERITING = 0x1, /* searching parent of target ds */
979 DSL_PROP_GET_SNAPSHOT = 0x2, /* snapshot dataset */
980 DSL_PROP_GET_LOCAL = 0x4, /* local properties */
981 DSL_PROP_GET_RECEIVED = 0x8, /* received properties */
982 } dsl_prop_getflags_t;
983
984 static int
dsl_prop_get_all_impl(objset_t * mos,uint64_t propobj,const char * setpoint,dsl_prop_getflags_t flags,nvlist_t * nv)985 dsl_prop_get_all_impl(objset_t *mos, uint64_t propobj,
986 const char *setpoint, dsl_prop_getflags_t flags, nvlist_t *nv)
987 {
988 zap_cursor_t zc;
989 zap_attribute_t za;
990 int err = 0;
991
992 for (zap_cursor_init(&zc, mos, propobj);
993 (err = zap_cursor_retrieve(&zc, &za)) == 0;
994 zap_cursor_advance(&zc)) {
995 nvlist_t *propval;
996 zfs_prop_t prop;
997 char buf[ZAP_MAXNAMELEN];
998 char *valstr;
999 const char *suffix;
1000 const char *propname;
1001 const char *source;
1002
1003 suffix = strchr(za.za_name, '$');
1004
1005 if (suffix == NULL) {
1006 /*
1007 * Skip local properties if we only want received
1008 * properties.
1009 */
1010 if (flags & DSL_PROP_GET_RECEIVED)
1011 continue;
1012
1013 propname = za.za_name;
1014 source = setpoint;
1015 } else if (strcmp(suffix, ZPROP_INHERIT_SUFFIX) == 0) {
1016 /* Skip explicitly inherited entries. */
1017 continue;
1018 } else if (strcmp(suffix, ZPROP_RECVD_SUFFIX) == 0) {
1019 if (flags & DSL_PROP_GET_LOCAL)
1020 continue;
1021
1022 (void) strncpy(buf, za.za_name, (suffix - za.za_name));
1023 buf[suffix - za.za_name] = '\0';
1024 propname = buf;
1025
1026 if (!(flags & DSL_PROP_GET_RECEIVED)) {
1027 /* Skip if locally overridden. */
1028 err = zap_contains(mos, propobj, propname);
1029 if (err == 0)
1030 continue;
1031 if (err != ENOENT)
1032 break;
1033
1034 /* Skip if explicitly inherited. */
1035 valstr = kmem_asprintf("%s%s", propname,
1036 ZPROP_INHERIT_SUFFIX);
1037 err = zap_contains(mos, propobj, valstr);
1038 kmem_strfree(valstr);
1039 if (err == 0)
1040 continue;
1041 if (err != ENOENT)
1042 break;
1043 }
1044
1045 source = ((flags & DSL_PROP_GET_INHERITING) ?
1046 setpoint : ZPROP_SOURCE_VAL_RECVD);
1047 } else {
1048 /*
1049 * For backward compatibility, skip suffixes we don't
1050 * recognize.
1051 */
1052 continue;
1053 }
1054
1055 prop = zfs_name_to_prop(propname);
1056
1057 /* Skip non-inheritable properties. */
1058 if ((flags & DSL_PROP_GET_INHERITING) && prop != ZPROP_INVAL &&
1059 !zfs_prop_inheritable(prop))
1060 continue;
1061
1062 /* Skip properties not valid for this type. */
1063 if ((flags & DSL_PROP_GET_SNAPSHOT) && prop != ZPROP_INVAL &&
1064 !zfs_prop_valid_for_type(prop, ZFS_TYPE_SNAPSHOT, B_FALSE))
1065 continue;
1066
1067 /* Skip properties already defined. */
1068 if (nvlist_exists(nv, propname))
1069 continue;
1070
1071 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1072 if (za.za_integer_length == 1) {
1073 /*
1074 * String property
1075 */
1076 char *tmp = kmem_alloc(za.za_num_integers,
1077 KM_SLEEP);
1078 err = zap_lookup(mos, propobj,
1079 za.za_name, 1, za.za_num_integers, tmp);
1080 if (err != 0) {
1081 kmem_free(tmp, za.za_num_integers);
1082 break;
1083 }
1084 VERIFY(nvlist_add_string(propval, ZPROP_VALUE,
1085 tmp) == 0);
1086 kmem_free(tmp, za.za_num_integers);
1087 } else {
1088 /*
1089 * Integer property
1090 */
1091 ASSERT(za.za_integer_length == 8);
1092 (void) nvlist_add_uint64(propval, ZPROP_VALUE,
1093 za.za_first_integer);
1094 }
1095
1096 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, source) == 0);
1097 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1098 nvlist_free(propval);
1099 }
1100 zap_cursor_fini(&zc);
1101 if (err == ENOENT)
1102 err = 0;
1103 return (err);
1104 }
1105
1106 /*
1107 * Iterate over all properties for this dataset and return them in an nvlist.
1108 */
1109 static int
dsl_prop_get_all_ds(dsl_dataset_t * ds,nvlist_t ** nvp,dsl_prop_getflags_t flags)1110 dsl_prop_get_all_ds(dsl_dataset_t *ds, nvlist_t **nvp,
1111 dsl_prop_getflags_t flags)
1112 {
1113 dsl_dir_t *dd = ds->ds_dir;
1114 dsl_pool_t *dp = dd->dd_pool;
1115 objset_t *mos = dp->dp_meta_objset;
1116 int err = 0;
1117 char setpoint[ZFS_MAX_DATASET_NAME_LEN];
1118
1119 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1120
1121 if (ds->ds_is_snapshot)
1122 flags |= DSL_PROP_GET_SNAPSHOT;
1123
1124 ASSERT(dsl_pool_config_held(dp));
1125
1126 if (dsl_dataset_phys(ds)->ds_props_obj != 0) {
1127 ASSERT(flags & DSL_PROP_GET_SNAPSHOT);
1128 dsl_dataset_name(ds, setpoint);
1129 err = dsl_prop_get_all_impl(mos,
1130 dsl_dataset_phys(ds)->ds_props_obj, setpoint, flags, *nvp);
1131 if (err)
1132 goto out;
1133 }
1134
1135 for (; dd != NULL; dd = dd->dd_parent) {
1136 if (dd != ds->ds_dir || (flags & DSL_PROP_GET_SNAPSHOT)) {
1137 if (flags & (DSL_PROP_GET_LOCAL |
1138 DSL_PROP_GET_RECEIVED))
1139 break;
1140 flags |= DSL_PROP_GET_INHERITING;
1141 }
1142 dsl_dir_name(dd, setpoint);
1143 err = dsl_prop_get_all_impl(mos,
1144 dsl_dir_phys(dd)->dd_props_zapobj, setpoint, flags, *nvp);
1145 if (err)
1146 break;
1147 }
1148
1149 out:
1150 if (err) {
1151 nvlist_free(*nvp);
1152 *nvp = NULL;
1153 }
1154 return (err);
1155 }
1156
1157 boolean_t
dsl_prop_get_hasrecvd(const char * dsname)1158 dsl_prop_get_hasrecvd(const char *dsname)
1159 {
1160 uint64_t dummy;
1161
1162 return (0 ==
1163 dsl_prop_get_integer(dsname, ZPROP_HAS_RECVD, &dummy, NULL));
1164 }
1165
1166 static int
dsl_prop_set_hasrecvd_impl(const char * dsname,zprop_source_t source)1167 dsl_prop_set_hasrecvd_impl(const char *dsname, zprop_source_t source)
1168 {
1169 uint64_t version;
1170 spa_t *spa;
1171 int error = 0;
1172
1173 VERIFY0(spa_open(dsname, &spa, FTAG));
1174 version = spa_version(spa);
1175 spa_close(spa, FTAG);
1176
1177 if (version >= SPA_VERSION_RECVD_PROPS)
1178 error = dsl_prop_set_int(dsname, ZPROP_HAS_RECVD, source, 0);
1179 return (error);
1180 }
1181
1182 /*
1183 * Call after successfully receiving properties to ensure that only the first
1184 * receive on or after SPA_VERSION_RECVD_PROPS blows away local properties.
1185 */
1186 int
dsl_prop_set_hasrecvd(const char * dsname)1187 dsl_prop_set_hasrecvd(const char *dsname)
1188 {
1189 int error = 0;
1190 if (!dsl_prop_get_hasrecvd(dsname))
1191 error = dsl_prop_set_hasrecvd_impl(dsname, ZPROP_SRC_LOCAL);
1192 return (error);
1193 }
1194
1195 void
dsl_prop_unset_hasrecvd(const char * dsname)1196 dsl_prop_unset_hasrecvd(const char *dsname)
1197 {
1198 VERIFY0(dsl_prop_set_hasrecvd_impl(dsname, ZPROP_SRC_NONE));
1199 }
1200
1201 int
dsl_prop_get_all(objset_t * os,nvlist_t ** nvp)1202 dsl_prop_get_all(objset_t *os, nvlist_t **nvp)
1203 {
1204 return (dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, 0));
1205 }
1206
1207 int
dsl_prop_get_received(const char * dsname,nvlist_t ** nvp)1208 dsl_prop_get_received(const char *dsname, nvlist_t **nvp)
1209 {
1210 objset_t *os;
1211 int error;
1212
1213 /*
1214 * Received properties are not distinguishable from local properties
1215 * until the dataset has received properties on or after
1216 * SPA_VERSION_RECVD_PROPS.
1217 */
1218 dsl_prop_getflags_t flags = (dsl_prop_get_hasrecvd(dsname) ?
1219 DSL_PROP_GET_RECEIVED : DSL_PROP_GET_LOCAL);
1220
1221 error = dmu_objset_hold(dsname, FTAG, &os);
1222 if (error != 0)
1223 return (error);
1224 error = dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, flags);
1225 dmu_objset_rele(os, FTAG);
1226 return (error);
1227 }
1228
1229 void
dsl_prop_nvlist_add_uint64(nvlist_t * nv,zfs_prop_t prop,uint64_t value)1230 dsl_prop_nvlist_add_uint64(nvlist_t *nv, zfs_prop_t prop, uint64_t value)
1231 {
1232 nvlist_t *propval;
1233 const char *propname = zfs_prop_to_name(prop);
1234 uint64_t default_value;
1235
1236 if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1237 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1238 return;
1239 }
1240
1241 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1242 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1243 /* Indicate the default source if we can. */
1244 if (dodefault(prop, 8, 1, &default_value) == 0 &&
1245 value == default_value) {
1246 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, "") == 0);
1247 }
1248 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1249 nvlist_free(propval);
1250 }
1251
1252 void
dsl_prop_nvlist_add_string(nvlist_t * nv,zfs_prop_t prop,const char * value)1253 dsl_prop_nvlist_add_string(nvlist_t *nv, zfs_prop_t prop, const char *value)
1254 {
1255 nvlist_t *propval;
1256 const char *propname = zfs_prop_to_name(prop);
1257
1258 if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1259 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1260 return;
1261 }
1262
1263 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1264 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1265 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1266 nvlist_free(propval);
1267 }
1268
1269 #if defined(_KERNEL)
1270 EXPORT_SYMBOL(dsl_prop_register);
1271 EXPORT_SYMBOL(dsl_prop_unregister);
1272 EXPORT_SYMBOL(dsl_prop_unregister_all);
1273 EXPORT_SYMBOL(dsl_prop_get);
1274 EXPORT_SYMBOL(dsl_prop_get_integer);
1275 EXPORT_SYMBOL(dsl_prop_get_all);
1276 EXPORT_SYMBOL(dsl_prop_get_received);
1277 EXPORT_SYMBOL(dsl_prop_get_ds);
1278 EXPORT_SYMBOL(dsl_prop_get_int_ds);
1279 EXPORT_SYMBOL(dsl_prop_get_dd);
1280 EXPORT_SYMBOL(dsl_props_set);
1281 EXPORT_SYMBOL(dsl_prop_set_int);
1282 EXPORT_SYMBOL(dsl_prop_set_string);
1283 EXPORT_SYMBOL(dsl_prop_inherit);
1284 EXPORT_SYMBOL(dsl_prop_predict);
1285 EXPORT_SYMBOL(dsl_prop_nvlist_add_uint64);
1286 EXPORT_SYMBOL(dsl_prop_nvlist_add_string);
1287 #endif
1288