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 2015, Joyent, Inc.
25  */
26 
27 #include <sys/zfs_context.h>
28 #include <sys/dmu.h>
29 #include <sys/dmu_objset.h>
30 #include <sys/dmu_tx.h>
31 #include <sys/dsl_dataset.h>
32 #include <sys/dsl_dir.h>
33 #include <sys/dsl_prop.h>
34 #include <sys/dsl_synctask.h>
35 #include <sys/spa.h>
36 #include <sys/zap.h>
37 #include <sys/fs/zfs.h>
38 
39 #include "zfs_prop.h"
40 
41 #define	ZPROP_INHERIT_SUFFIX "$inherit"
42 #define	ZPROP_RECVD_SUFFIX "$recvd"
43 
44 static int
dodefault(zfs_prop_t prop,int intsz,int numints,void * buf)45 dodefault(zfs_prop_t prop, int intsz, int numints, void *buf)
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 == ZPROP_INVAL ||
53 	    (zfs_prop_readonly(prop) && !zfs_prop_setonce(prop)))
54 		return (SET_ERROR(ENOENT));
55 
56 	if (zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
57 		if (zfs_prop_default_string(prop) == NULL)
58 			return (SET_ERROR(ENOENT));
59 		if (intsz != 1)
60 			return (SET_ERROR(EOVERFLOW));
61 		(void) strncpy(buf, zfs_prop_default_string(prop),
62 		    numints);
63 	} else {
64 		if (intsz != 8 || numints < 1)
65 			return (SET_ERROR(EOVERFLOW));
66 
67 		*(uint64_t *)buf = zfs_prop_default_numeric(prop);
68 	}
69 
70 	return (0);
71 }
72 
73 int
dsl_prop_get_dd(dsl_dir_t * dd,const char * propname,int intsz,int numints,void * buf,char * setpoint,boolean_t snapshot)74 dsl_prop_get_dd(dsl_dir_t *dd, const char *propname,
75     int intsz, int numints, void *buf, char *setpoint, boolean_t snapshot)
76 {
77 	int err = ENOENT;
78 	dsl_dir_t *target = dd;
79 	objset_t *mos = dd->dd_pool->dp_meta_objset;
80 	zfs_prop_t prop;
81 	boolean_t inheritable;
82 	boolean_t inheriting = B_FALSE;
83 	char *inheritstr;
84 	char *recvdstr;
85 
86 	ASSERT(dsl_pool_config_held(dd->dd_pool));
87 
88 	if (setpoint)
89 		setpoint[0] = '\0';
90 
91 	prop = zfs_name_to_prop(propname);
92 	inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
93 	inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
94 	recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
95 
96 	/*
97 	 * Note: dd may become NULL, therefore we shouldn't dereference it
98 	 * after this loop.
99 	 */
100 	for (; dd != NULL; dd = dd->dd_parent) {
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, dsl_dir_phys(dd)->dd_props_zapobj,
109 		    propname, 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, dsl_dir_phys(dd)->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, dsl_dir_phys(dd)->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 = SET_ERROR(ENOENT);
149 	}
150 
151 	if (err == ENOENT)
152 		err = dodefault(prop, intsz, numints, buf);
153 
154 	strfree(inheritstr);
155 	strfree(recvdstr);
156 
157 	return (err);
158 }
159 
160 int
dsl_prop_get_ds(dsl_dataset_t * ds,const char * propname,int intsz,int numints,void * buf,char * setpoint)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 	uint64_t zapobj;
167 
168 	ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
169 	inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
170 	zapobj = dsl_dataset_phys(ds)->ds_props_obj;
171 
172 	if (zapobj != 0) {
173 		objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
174 		int err;
175 
176 		ASSERT(ds->ds_is_snapshot);
177 
178 		/* Check for a local value. */
179 		err = zap_lookup(mos, zapobj, propname, intsz, numints, buf);
180 		if (err != ENOENT) {
181 			if (setpoint != NULL && err == 0)
182 				dsl_dataset_name(ds, setpoint);
183 			return (err);
184 		}
185 
186 		/*
187 		 * Skip the check for a received value if there is an explicit
188 		 * inheritance entry.
189 		 */
190 		if (inheritable) {
191 			char *inheritstr = kmem_asprintf("%s%s", propname,
192 			    ZPROP_INHERIT_SUFFIX);
193 			err = zap_contains(mos, zapobj, inheritstr);
194 			strfree(inheritstr);
195 			if (err != 0 && err != ENOENT)
196 				return (err);
197 		}
198 
199 		if (err == ENOENT) {
200 			/* Check for a received value. */
201 			char *recvdstr = kmem_asprintf("%s%s", propname,
202 			    ZPROP_RECVD_SUFFIX);
203 			err = zap_lookup(mos, zapobj, recvdstr,
204 			    intsz, numints, buf);
205 			strfree(recvdstr);
206 			if (err != ENOENT) {
207 				if (setpoint != NULL && err == 0)
208 					(void) strcpy(setpoint,
209 					    ZPROP_SOURCE_VAL_RECVD);
210 				return (err);
211 			}
212 		}
213 	}
214 
215 	return (dsl_prop_get_dd(ds->ds_dir, propname,
216 	    intsz, numints, buf, setpoint, ds->ds_is_snapshot));
217 }
218 
219 static dsl_prop_record_t *
dsl_prop_record_find(dsl_dir_t * dd,const char * propname)220 dsl_prop_record_find(dsl_dir_t *dd, const char *propname)
221 {
222 	dsl_prop_record_t *pr = NULL;
223 
224 	ASSERT(MUTEX_HELD(&dd->dd_lock));
225 
226 	for (pr = list_head(&dd->dd_props);
227 	    pr != NULL; pr = list_next(&dd->dd_props, pr)) {
228 		if (strcmp(pr->pr_propname, propname) == 0)
229 			break;
230 	}
231 
232 	return (pr);
233 }
234 
235 static dsl_prop_record_t *
dsl_prop_record_create(dsl_dir_t * dd,const char * propname)236 dsl_prop_record_create(dsl_dir_t *dd, const char *propname)
237 {
238 	dsl_prop_record_t *pr;
239 
240 	ASSERT(MUTEX_HELD(&dd->dd_lock));
241 
242 	pr = kmem_alloc(sizeof (dsl_prop_record_t), KM_SLEEP);
243 	pr->pr_propname = spa_strdup(propname);
244 	list_create(&pr->pr_cbs, sizeof (dsl_prop_cb_record_t),
245 	    offsetof(dsl_prop_cb_record_t, cbr_pr_node));
246 	list_insert_head(&dd->dd_props, pr);
247 
248 	return (pr);
249 }
250 
251 void
dsl_prop_init(dsl_dir_t * dd)252 dsl_prop_init(dsl_dir_t *dd)
253 {
254 	list_create(&dd->dd_props, sizeof (dsl_prop_record_t),
255 	    offsetof(dsl_prop_record_t, pr_node));
256 }
257 
258 void
dsl_prop_fini(dsl_dir_t * dd)259 dsl_prop_fini(dsl_dir_t *dd)
260 {
261 	dsl_prop_record_t *pr;
262 
263 	while ((pr = list_remove_head(&dd->dd_props)) != NULL) {
264 		list_destroy(&pr->pr_cbs);
265 		strfree((char *)pr->pr_propname);
266 		kmem_free(pr, sizeof (dsl_prop_record_t));
267 	}
268 	list_destroy(&dd->dd_props);
269 }
270 
271 /*
272  * Register interest in the named property.  We'll call the callback
273  * once to notify it of the current property value, and again each time
274  * the property changes, until this callback is unregistered.
275  *
276  * Return 0 on success, errno if the prop is not an integer value.
277  */
278 int
dsl_prop_register(dsl_dataset_t * ds,const char * propname,dsl_prop_changed_cb_t * callback,void * cbarg)279 dsl_prop_register(dsl_dataset_t *ds, const char *propname,
280     dsl_prop_changed_cb_t *callback, void *cbarg)
281 {
282 	dsl_dir_t *dd = ds->ds_dir;
283 	dsl_pool_t *dp = dd->dd_pool;
284 	uint64_t value;
285 	dsl_prop_record_t *pr;
286 	dsl_prop_cb_record_t *cbr;
287 	int err;
288 
289 	ASSERT(dsl_pool_config_held(dp));
290 
291 	err = dsl_prop_get_int_ds(ds, propname, &value);
292 	if (err != 0)
293 		return (err);
294 
295 	cbr = kmem_alloc(sizeof (dsl_prop_cb_record_t), KM_SLEEP);
296 	cbr->cbr_ds = ds;
297 	cbr->cbr_func = callback;
298 	cbr->cbr_arg = cbarg;
299 
300 	mutex_enter(&dd->dd_lock);
301 	pr = dsl_prop_record_find(dd, propname);
302 	if (pr == NULL)
303 		pr = dsl_prop_record_create(dd, propname);
304 	cbr->cbr_pr = pr;
305 	list_insert_head(&pr->pr_cbs, cbr);
306 	list_insert_head(&ds->ds_prop_cbs, cbr);
307 	mutex_exit(&dd->dd_lock);
308 
309 	cbr->cbr_func(cbr->cbr_arg, value);
310 	return (0);
311 }
312 
313 int
dsl_prop_get(const char * dsname,const char * propname,int intsz,int numints,void * buf,char * setpoint)314 dsl_prop_get(const char *dsname, const char *propname,
315     int intsz, int numints, void *buf, char *setpoint)
316 {
317 	objset_t *os;
318 	int error;
319 
320 	error = dmu_objset_hold(dsname, FTAG, &os);
321 	if (error != 0)
322 		return (error);
323 
324 	error = dsl_prop_get_ds(dmu_objset_ds(os), propname,
325 	    intsz, numints, buf, setpoint);
326 
327 	dmu_objset_rele(os, FTAG);
328 	return (error);
329 }
330 
331 /*
332  * Get the current property value.  It may have changed by the time this
333  * function returns, so it is NOT safe to follow up with
334  * dsl_prop_register() and assume that the value has not changed in
335  * between.
336  *
337  * Return 0 on success, ENOENT if ddname is invalid.
338  */
339 int
dsl_prop_get_integer(const char * ddname,const char * propname,uint64_t * valuep,char * setpoint)340 dsl_prop_get_integer(const char *ddname, const char *propname,
341     uint64_t *valuep, char *setpoint)
342 {
343 	return (dsl_prop_get(ddname, propname, 8, 1, valuep, setpoint));
344 }
345 
346 int
dsl_prop_get_int_ds(dsl_dataset_t * ds,const char * propname,uint64_t * valuep)347 dsl_prop_get_int_ds(dsl_dataset_t *ds, const char *propname,
348     uint64_t *valuep)
349 {
350 	return (dsl_prop_get_ds(ds, propname, 8, 1, valuep, NULL));
351 }
352 
353 /*
354  * Predict the effective value of the given special property if it were set with
355  * the given value and source. This is not a general purpose function. It exists
356  * only to handle the special requirements of the quota and reservation
357  * properties. The fact that these properties are non-inheritable greatly
358  * simplifies the prediction logic.
359  *
360  * Returns 0 on success, a positive error code on failure, or -1 if called with
361  * a property not handled by this function.
362  */
363 int
dsl_prop_predict(dsl_dir_t * dd,const char * propname,zprop_source_t source,uint64_t value,uint64_t * newvalp)364 dsl_prop_predict(dsl_dir_t *dd, const char *propname,
365     zprop_source_t source, uint64_t value, uint64_t *newvalp)
366 {
367 	zfs_prop_t prop = zfs_name_to_prop(propname);
368 	objset_t *mos;
369 	uint64_t zapobj;
370 	uint64_t version;
371 	char *recvdstr;
372 	int err = 0;
373 
374 	switch (prop) {
375 	case ZFS_PROP_QUOTA:
376 	case ZFS_PROP_RESERVATION:
377 	case ZFS_PROP_REFQUOTA:
378 	case ZFS_PROP_REFRESERVATION:
379 		break;
380 	default:
381 		return (-1);
382 	}
383 
384 	mos = dd->dd_pool->dp_meta_objset;
385 	zapobj = dsl_dir_phys(dd)->dd_props_zapobj;
386 	recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
387 
388 	version = spa_version(dd->dd_pool->dp_spa);
389 	if (version < SPA_VERSION_RECVD_PROPS) {
390 		if (source & ZPROP_SRC_NONE)
391 			source = ZPROP_SRC_NONE;
392 		else if (source & ZPROP_SRC_RECEIVED)
393 			source = ZPROP_SRC_LOCAL;
394 	}
395 
396 	switch (source) {
397 	case ZPROP_SRC_NONE:
398 		/* Revert to the received value, if any. */
399 		err = zap_lookup(mos, zapobj, recvdstr, 8, 1, newvalp);
400 		if (err == ENOENT)
401 			*newvalp = 0;
402 		break;
403 	case ZPROP_SRC_LOCAL:
404 		*newvalp = value;
405 		break;
406 	case ZPROP_SRC_RECEIVED:
407 		/*
408 		 * If there's no local setting, then the new received value will
409 		 * be the effective value.
410 		 */
411 		err = zap_lookup(mos, zapobj, propname, 8, 1, newvalp);
412 		if (err == ENOENT)
413 			*newvalp = value;
414 		break;
415 	case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
416 		/*
417 		 * We're clearing the received value, so the local setting (if
418 		 * it exists) remains the effective value.
419 		 */
420 		err = zap_lookup(mos, zapobj, propname, 8, 1, newvalp);
421 		if (err == ENOENT)
422 			*newvalp = 0;
423 		break;
424 	default:
425 		panic("unexpected property source: %d", source);
426 	}
427 
428 	strfree(recvdstr);
429 
430 	if (err == ENOENT)
431 		return (0);
432 
433 	return (err);
434 }
435 
436 /*
437  * Unregister all callbacks that are registered with the
438  * given callback argument.
439  */
440 void
dsl_prop_unregister_all(dsl_dataset_t * ds,void * cbarg)441 dsl_prop_unregister_all(dsl_dataset_t *ds, void *cbarg)
442 {
443 	dsl_prop_cb_record_t *cbr, *next_cbr;
444 
445 	dsl_dir_t *dd = ds->ds_dir;
446 
447 	mutex_enter(&dd->dd_lock);
448 	next_cbr = list_head(&ds->ds_prop_cbs);
449 	while (next_cbr != NULL) {
450 		cbr = next_cbr;
451 		next_cbr = list_next(&ds->ds_prop_cbs, cbr);
452 		if (cbr->cbr_arg == cbarg) {
453 			list_remove(&ds->ds_prop_cbs, cbr);
454 			list_remove(&cbr->cbr_pr->pr_cbs, cbr);
455 			kmem_free(cbr, sizeof (dsl_prop_cb_record_t));
456 		}
457 	}
458 	mutex_exit(&dd->dd_lock);
459 }
460 
461 boolean_t
dsl_prop_hascb(dsl_dataset_t * ds)462 dsl_prop_hascb(dsl_dataset_t *ds)
463 {
464 	return (!list_is_empty(&ds->ds_prop_cbs));
465 }
466 
467 /* ARGSUSED */
468 static int
dsl_prop_notify_all_cb(dsl_pool_t * dp,dsl_dataset_t * ds,void * arg)469 dsl_prop_notify_all_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg)
470 {
471 	dsl_dir_t *dd = ds->ds_dir;
472 	dsl_prop_record_t *pr;
473 	dsl_prop_cb_record_t *cbr;
474 
475 	mutex_enter(&dd->dd_lock);
476 	for (pr = list_head(&dd->dd_props);
477 	    pr; pr = list_next(&dd->dd_props, pr)) {
478 		for (cbr = list_head(&pr->pr_cbs); cbr;
479 		    cbr = list_next(&pr->pr_cbs, cbr)) {
480 			uint64_t value;
481 
482 			/*
483 			 * Callback entries do not have holds on their
484 			 * datasets so that datasets with registered
485 			 * callbacks are still eligible for eviction.
486 			 * Unlike operations to update properties on a
487 			 * single dataset, we are performing a recursive
488 			 * descent of related head datasets.  The caller
489 			 * of this function only has a dataset hold on
490 			 * the passed in head dataset, not the snapshots
491 			 * associated with this dataset.  Without a hold,
492 			 * the dataset pointer within callback records
493 			 * for snapshots can be invalidated by eviction
494 			 * at any time.
495 			 *
496 			 * Use dsl_dataset_try_add_ref() to verify
497 			 * that the dataset for a snapshot has not
498 			 * begun eviction processing and to prevent
499 			 * eviction from occurring for the duration of
500 			 * the callback.  If the hold attempt fails,
501 			 * this object is already being evicted and the
502 			 * callback can be safely ignored.
503 			 */
504 			if (ds != cbr->cbr_ds &&
505 			    !dsl_dataset_try_add_ref(dp, cbr->cbr_ds, FTAG))
506 				continue;
507 
508 			if (dsl_prop_get_ds(cbr->cbr_ds,
509 			    cbr->cbr_pr->pr_propname, sizeof (value), 1,
510 			    &value, NULL) == 0)
511 				cbr->cbr_func(cbr->cbr_arg, value);
512 
513 			if (ds != cbr->cbr_ds)
514 				dsl_dataset_rele(cbr->cbr_ds, FTAG);
515 		}
516 	}
517 	mutex_exit(&dd->dd_lock);
518 
519 	return (0);
520 }
521 
522 /*
523  * Update all property values for ddobj & its descendants.  This is used
524  * when renaming the dir.
525  */
526 void
dsl_prop_notify_all(dsl_dir_t * dd)527 dsl_prop_notify_all(dsl_dir_t *dd)
528 {
529 	dsl_pool_t *dp = dd->dd_pool;
530 	ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
531 	(void) dmu_objset_find_dp(dp, dd->dd_object, dsl_prop_notify_all_cb,
532 	    NULL, DS_FIND_CHILDREN);
533 }
534 
535 static void
dsl_prop_changed_notify(dsl_pool_t * dp,uint64_t ddobj,const char * propname,uint64_t value,int first)536 dsl_prop_changed_notify(dsl_pool_t *dp, uint64_t ddobj,
537     const char *propname, uint64_t value, int first)
538 {
539 	dsl_dir_t *dd;
540 	dsl_prop_record_t *pr;
541 	dsl_prop_cb_record_t *cbr;
542 	objset_t *mos = dp->dp_meta_objset;
543 	zap_cursor_t zc;
544 	zap_attribute_t *za;
545 	int err;
546 
547 	ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
548 	err = dsl_dir_hold_obj(dp, ddobj, NULL, FTAG, &dd);
549 	if (err)
550 		return;
551 
552 	if (!first) {
553 		/*
554 		 * If the prop is set here, then this change is not
555 		 * being inherited here or below; stop the recursion.
556 		 */
557 		err = zap_contains(mos, dsl_dir_phys(dd)->dd_props_zapobj,
558 		    propname);
559 		if (err == 0) {
560 			dsl_dir_rele(dd, FTAG);
561 			return;
562 		}
563 		ASSERT3U(err, ==, ENOENT);
564 	}
565 
566 	mutex_enter(&dd->dd_lock);
567 	pr = dsl_prop_record_find(dd, propname);
568 	if (pr != NULL) {
569 		for (cbr = list_head(&pr->pr_cbs); cbr;
570 		    cbr = list_next(&pr->pr_cbs, cbr)) {
571 			uint64_t propobj;
572 
573 			/*
574 			 * cbr->cbr_ds may be invalidated due to eviction,
575 			 * requiring the use of dsl_dataset_try_add_ref().
576 			 * See comment block in dsl_prop_notify_all_cb()
577 			 * for details.
578 			 */
579 			if (!dsl_dataset_try_add_ref(dp, cbr->cbr_ds, FTAG))
580 				continue;
581 
582 			propobj = dsl_dataset_phys(cbr->cbr_ds)->ds_props_obj;
583 
584 			/*
585 			 * If the property is not set on this ds, then it is
586 			 * inherited here; call the callback.
587 			 */
588 			if (propobj == 0 ||
589 			    zap_contains(mos, propobj, propname) != 0)
590 				cbr->cbr_func(cbr->cbr_arg, value);
591 
592 			dsl_dataset_rele(cbr->cbr_ds, FTAG);
593 		}
594 	}
595 	mutex_exit(&dd->dd_lock);
596 
597 	za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
598 	for (zap_cursor_init(&zc, mos,
599 	    dsl_dir_phys(dd)->dd_child_dir_zapobj);
600 	    zap_cursor_retrieve(&zc, za) == 0;
601 	    zap_cursor_advance(&zc)) {
602 		dsl_prop_changed_notify(dp, za->za_first_integer,
603 		    propname, value, FALSE);
604 	}
605 	kmem_free(za, sizeof (zap_attribute_t));
606 	zap_cursor_fini(&zc);
607 	dsl_dir_rele(dd, FTAG);
608 }
609 
610 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)611 dsl_prop_set_sync_impl(dsl_dataset_t *ds, const char *propname,
612     zprop_source_t source, int intsz, int numints, const void *value,
613     dmu_tx_t *tx)
614 {
615 	objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
616 	uint64_t zapobj, intval, dummy;
617 	int isint;
618 	char valbuf[32];
619 	const char *valstr = NULL;
620 	char *inheritstr;
621 	char *recvdstr;
622 	char *tbuf = NULL;
623 	int err;
624 	uint64_t version = spa_version(ds->ds_dir->dd_pool->dp_spa);
625 
626 	isint = (dodefault(zfs_name_to_prop(propname), 8, 1, &intval) == 0);
627 
628 	if (ds->ds_is_snapshot) {
629 		ASSERT(version >= SPA_VERSION_SNAP_PROPS);
630 		if (dsl_dataset_phys(ds)->ds_props_obj == 0) {
631 			dmu_buf_will_dirty(ds->ds_dbuf, tx);
632 			dsl_dataset_phys(ds)->ds_props_obj =
633 			    zap_create(mos,
634 			    DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
635 		}
636 		zapobj = dsl_dataset_phys(ds)->ds_props_obj;
637 	} else {
638 		zapobj = dsl_dir_phys(ds->ds_dir)->dd_props_zapobj;
639 	}
640 
641 	if (version < SPA_VERSION_RECVD_PROPS) {
642 		if (source & ZPROP_SRC_NONE)
643 			source = ZPROP_SRC_NONE;
644 		else if (source & ZPROP_SRC_RECEIVED)
645 			source = ZPROP_SRC_LOCAL;
646 	}
647 
648 	inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
649 	recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
650 
651 	switch (source) {
652 	case ZPROP_SRC_NONE:
653 		/*
654 		 * revert to received value, if any (inherit -S)
655 		 * - remove propname
656 		 * - remove propname$inherit
657 		 */
658 		err = zap_remove(mos, zapobj, propname, tx);
659 		ASSERT(err == 0 || err == ENOENT);
660 		err = zap_remove(mos, zapobj, inheritstr, tx);
661 		ASSERT(err == 0 || err == ENOENT);
662 		break;
663 	case ZPROP_SRC_LOCAL:
664 		/*
665 		 * remove propname$inherit
666 		 * set propname -> value
667 		 */
668 		err = zap_remove(mos, zapobj, inheritstr, tx);
669 		ASSERT(err == 0 || err == ENOENT);
670 		VERIFY0(zap_update(mos, zapobj, propname,
671 		    intsz, numints, value, tx));
672 		break;
673 	case ZPROP_SRC_INHERITED:
674 		/*
675 		 * explicitly inherit
676 		 * - remove propname
677 		 * - set propname$inherit
678 		 */
679 		err = zap_remove(mos, zapobj, propname, tx);
680 		ASSERT(err == 0 || err == ENOENT);
681 		if (version >= SPA_VERSION_RECVD_PROPS &&
682 		    dsl_prop_get_int_ds(ds, ZPROP_HAS_RECVD, &dummy) == 0) {
683 			dummy = 0;
684 			VERIFY0(zap_update(mos, zapobj, inheritstr,
685 			    8, 1, &dummy, tx));
686 		}
687 		break;
688 	case ZPROP_SRC_RECEIVED:
689 		/*
690 		 * set propname$recvd -> value
691 		 */
692 		err = zap_update(mos, zapobj, recvdstr,
693 		    intsz, numints, value, tx);
694 		ASSERT(err == 0);
695 		break;
696 	case (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED):
697 		/*
698 		 * clear local and received settings
699 		 * - remove propname
700 		 * - remove propname$inherit
701 		 * - remove propname$recvd
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 		/* FALLTHRU */
708 	case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
709 		/*
710 		 * remove propname$recvd
711 		 */
712 		err = zap_remove(mos, zapobj, recvdstr, tx);
713 		ASSERT(err == 0 || err == ENOENT);
714 		break;
715 	default:
716 		cmn_err(CE_PANIC, "unexpected property source: %d", source);
717 	}
718 
719 	strfree(inheritstr);
720 	strfree(recvdstr);
721 
722 	if (isint) {
723 		VERIFY0(dsl_prop_get_int_ds(ds, propname, &intval));
724 
725 		if (ds->ds_is_snapshot) {
726 			dsl_prop_cb_record_t *cbr;
727 			/*
728 			 * It's a snapshot; nothing can inherit this
729 			 * property, so just look for callbacks on this
730 			 * ds here.
731 			 */
732 			mutex_enter(&ds->ds_dir->dd_lock);
733 			for (cbr = list_head(&ds->ds_prop_cbs); cbr;
734 			    cbr = list_next(&ds->ds_prop_cbs, cbr)) {
735 				if (strcmp(cbr->cbr_pr->pr_propname,
736 				    propname) == 0)
737 					cbr->cbr_func(cbr->cbr_arg, intval);
738 			}
739 			mutex_exit(&ds->ds_dir->dd_lock);
740 		} else {
741 			dsl_prop_changed_notify(ds->ds_dir->dd_pool,
742 			    ds->ds_dir->dd_object, propname, intval, TRUE);
743 		}
744 
745 		(void) snprintf(valbuf, sizeof (valbuf),
746 		    "%lld", (longlong_t)intval);
747 		valstr = valbuf;
748 	} else {
749 		if (source == ZPROP_SRC_LOCAL) {
750 			valstr = value;
751 		} else {
752 			tbuf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
753 			if (dsl_prop_get_ds(ds, propname, 1,
754 			    ZAP_MAXVALUELEN, tbuf, NULL) == 0)
755 				valstr = tbuf;
756 		}
757 	}
758 
759 	spa_history_log_internal_ds(ds, (source == ZPROP_SRC_NONE ||
760 	    source == ZPROP_SRC_INHERITED) ? "inherit" : "set", tx,
761 	    "%s=%s", propname, (valstr == NULL ? "" : valstr));
762 
763 	if (tbuf != NULL)
764 		kmem_free(tbuf, ZAP_MAXVALUELEN);
765 }
766 
767 int
dsl_prop_set_int(const char * dsname,const char * propname,zprop_source_t source,uint64_t value)768 dsl_prop_set_int(const char *dsname, const char *propname,
769     zprop_source_t source, uint64_t value)
770 {
771 	nvlist_t *nvl = fnvlist_alloc();
772 	int error;
773 
774 	fnvlist_add_uint64(nvl, propname, value);
775 	error = dsl_props_set(dsname, source, nvl);
776 	fnvlist_free(nvl);
777 	return (error);
778 }
779 
780 int
dsl_prop_set_string(const char * dsname,const char * propname,zprop_source_t source,const char * value)781 dsl_prop_set_string(const char *dsname, const char *propname,
782     zprop_source_t source, const char *value)
783 {
784 	nvlist_t *nvl = fnvlist_alloc();
785 	int error;
786 
787 	fnvlist_add_string(nvl, propname, value);
788 	error = dsl_props_set(dsname, source, nvl);
789 	fnvlist_free(nvl);
790 	return (error);
791 }
792 
793 int
dsl_prop_inherit(const char * dsname,const char * propname,zprop_source_t source)794 dsl_prop_inherit(const char *dsname, const char *propname,
795     zprop_source_t source)
796 {
797 	nvlist_t *nvl = fnvlist_alloc();
798 	int error;
799 
800 	fnvlist_add_boolean(nvl, propname);
801 	error = dsl_props_set(dsname, source, nvl);
802 	fnvlist_free(nvl);
803 	return (error);
804 }
805 
806 typedef struct dsl_props_set_arg {
807 	const char *dpsa_dsname;
808 	zprop_source_t dpsa_source;
809 	nvlist_t *dpsa_props;
810 } dsl_props_set_arg_t;
811 
812 static int
dsl_props_set_check(void * arg,dmu_tx_t * tx)813 dsl_props_set_check(void *arg, dmu_tx_t *tx)
814 {
815 	dsl_props_set_arg_t *dpsa = arg;
816 	dsl_pool_t *dp = dmu_tx_pool(tx);
817 	dsl_dataset_t *ds;
818 	uint64_t version;
819 	nvpair_t *elem = NULL;
820 	int err;
821 
822 	err = dsl_dataset_hold(dp, dpsa->dpsa_dsname, FTAG, &ds);
823 	if (err != 0)
824 		return (err);
825 
826 	version = spa_version(ds->ds_dir->dd_pool->dp_spa);
827 	while ((elem = nvlist_next_nvpair(dpsa->dpsa_props, elem)) != NULL) {
828 		if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
829 			dsl_dataset_rele(ds, FTAG);
830 			return (SET_ERROR(ENAMETOOLONG));
831 		}
832 		if (nvpair_type(elem) == DATA_TYPE_STRING) {
833 			char *valstr = fnvpair_value_string(elem);
834 			if (strlen(valstr) >= (version <
835 			    SPA_VERSION_STMF_PROP ?
836 			    ZAP_OLDMAXVALUELEN : ZAP_MAXVALUELEN)) {
837 				dsl_dataset_rele(ds, FTAG);
838 				return (E2BIG);
839 			}
840 		}
841 	}
842 
843 	if (ds->ds_is_snapshot && version < SPA_VERSION_SNAP_PROPS) {
844 		dsl_dataset_rele(ds, FTAG);
845 		return (SET_ERROR(ENOTSUP));
846 	}
847 	dsl_dataset_rele(ds, FTAG);
848 	return (0);
849 }
850 
851 void
dsl_props_set_sync_impl(dsl_dataset_t * ds,zprop_source_t source,nvlist_t * props,dmu_tx_t * tx)852 dsl_props_set_sync_impl(dsl_dataset_t *ds, zprop_source_t source,
853     nvlist_t *props, dmu_tx_t *tx)
854 {
855 	nvpair_t *elem = NULL;
856 
857 	while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
858 		nvpair_t *pair = elem;
859 
860 		if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
861 			/*
862 			 * dsl_prop_get_all_impl() returns properties in this
863 			 * format.
864 			 */
865 			nvlist_t *attrs = fnvpair_value_nvlist(pair);
866 			pair = fnvlist_lookup_nvpair(attrs, ZPROP_VALUE);
867 		}
868 
869 		if (nvpair_type(pair) == DATA_TYPE_STRING) {
870 			const char *value = fnvpair_value_string(pair);
871 			dsl_prop_set_sync_impl(ds, nvpair_name(pair),
872 			    source, 1, strlen(value) + 1, value, tx);
873 		} else if (nvpair_type(pair) == DATA_TYPE_UINT64) {
874 			uint64_t intval = fnvpair_value_uint64(pair);
875 			dsl_prop_set_sync_impl(ds, nvpair_name(pair),
876 			    source, sizeof (intval), 1, &intval, tx);
877 		} else if (nvpair_type(pair) == DATA_TYPE_BOOLEAN) {
878 			dsl_prop_set_sync_impl(ds, nvpair_name(pair),
879 			    source, 0, 0, NULL, tx);
880 		} else {
881 			panic("invalid nvpair type");
882 		}
883 	}
884 }
885 
886 static void
dsl_props_set_sync(void * arg,dmu_tx_t * tx)887 dsl_props_set_sync(void *arg, dmu_tx_t *tx)
888 {
889 	dsl_props_set_arg_t *dpsa = arg;
890 	dsl_pool_t *dp = dmu_tx_pool(tx);
891 	dsl_dataset_t *ds;
892 
893 	VERIFY0(dsl_dataset_hold(dp, dpsa->dpsa_dsname, FTAG, &ds));
894 	dsl_props_set_sync_impl(ds, dpsa->dpsa_source, dpsa->dpsa_props, tx);
895 	dsl_dataset_rele(ds, FTAG);
896 }
897 
898 /*
899  * All-or-nothing; if any prop can't be set, nothing will be modified.
900  */
901 int
dsl_props_set(const char * dsname,zprop_source_t source,nvlist_t * props)902 dsl_props_set(const char *dsname, zprop_source_t source, nvlist_t *props)
903 {
904 	dsl_props_set_arg_t dpsa;
905 	int nblks = 0;
906 
907 	dpsa.dpsa_dsname = dsname;
908 	dpsa.dpsa_source = source;
909 	dpsa.dpsa_props = props;
910 
911 	/*
912 	 * If the source includes NONE, then we will only be removing entries
913 	 * from the ZAP object.  In that case don't check for ENOSPC.
914 	 */
915 	if ((source & ZPROP_SRC_NONE) == 0)
916 		nblks = 2 * fnvlist_num_pairs(props);
917 
918 	return (dsl_sync_task(dsname, dsl_props_set_check, dsl_props_set_sync,
919 	    &dpsa, nblks, ZFS_SPACE_CHECK_RESERVED));
920 }
921 
922 typedef enum dsl_prop_getflags {
923 	DSL_PROP_GET_INHERITING = 0x1,	/* searching parent of target ds */
924 	DSL_PROP_GET_SNAPSHOT = 0x2,	/* snapshot dataset */
925 	DSL_PROP_GET_LOCAL = 0x4,	/* local properties */
926 	DSL_PROP_GET_RECEIVED = 0x8	/* received properties */
927 } dsl_prop_getflags_t;
928 
929 static int
dsl_prop_get_all_impl(objset_t * mos,uint64_t propobj,const char * setpoint,dsl_prop_getflags_t flags,nvlist_t * nv)930 dsl_prop_get_all_impl(objset_t *mos, uint64_t propobj,
931     const char *setpoint, dsl_prop_getflags_t flags, nvlist_t *nv)
932 {
933 	zap_cursor_t zc;
934 	zap_attribute_t za;
935 	int err = 0;
936 
937 	for (zap_cursor_init(&zc, mos, propobj);
938 	    (err = zap_cursor_retrieve(&zc, &za)) == 0;
939 	    zap_cursor_advance(&zc)) {
940 		nvlist_t *propval;
941 		zfs_prop_t prop;
942 		char buf[ZAP_MAXNAMELEN];
943 		char *valstr;
944 		const char *suffix;
945 		const char *propname;
946 		const char *source;
947 
948 		suffix = strchr(za.za_name, '$');
949 
950 		if (suffix == NULL) {
951 			/*
952 			 * Skip local properties if we only want received
953 			 * properties.
954 			 */
955 			if (flags & DSL_PROP_GET_RECEIVED)
956 				continue;
957 
958 			propname = za.za_name;
959 			source = setpoint;
960 		} else if (strcmp(suffix, ZPROP_INHERIT_SUFFIX) == 0) {
961 			/* Skip explicitly inherited entries. */
962 			continue;
963 		} else if (strcmp(suffix, ZPROP_RECVD_SUFFIX) == 0) {
964 			if (flags & DSL_PROP_GET_LOCAL)
965 				continue;
966 
967 			(void) strncpy(buf, za.za_name, (suffix - za.za_name));
968 			buf[suffix - za.za_name] = '\0';
969 			propname = buf;
970 
971 			if (!(flags & DSL_PROP_GET_RECEIVED)) {
972 				/* Skip if locally overridden. */
973 				err = zap_contains(mos, propobj, propname);
974 				if (err == 0)
975 					continue;
976 				if (err != ENOENT)
977 					break;
978 
979 				/* Skip if explicitly inherited. */
980 				valstr = kmem_asprintf("%s%s", propname,
981 				    ZPROP_INHERIT_SUFFIX);
982 				err = zap_contains(mos, propobj, valstr);
983 				strfree(valstr);
984 				if (err == 0)
985 					continue;
986 				if (err != ENOENT)
987 					break;
988 			}
989 
990 			source = ((flags & DSL_PROP_GET_INHERITING) ?
991 			    setpoint : ZPROP_SOURCE_VAL_RECVD);
992 		} else {
993 			/*
994 			 * For backward compatibility, skip suffixes we don't
995 			 * recognize.
996 			 */
997 			continue;
998 		}
999 
1000 		prop = zfs_name_to_prop(propname);
1001 
1002 		/* Skip non-inheritable properties. */
1003 		if ((flags & DSL_PROP_GET_INHERITING) && prop != ZPROP_INVAL &&
1004 		    !zfs_prop_inheritable(prop))
1005 			continue;
1006 
1007 		/* Skip properties not valid for this type. */
1008 		if ((flags & DSL_PROP_GET_SNAPSHOT) && prop != ZPROP_INVAL &&
1009 		    !zfs_prop_valid_for_type(prop, ZFS_TYPE_SNAPSHOT))
1010 			continue;
1011 
1012 		/* Skip properties already defined. */
1013 		if (nvlist_exists(nv, propname))
1014 			continue;
1015 
1016 		VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1017 		if (za.za_integer_length == 1) {
1018 			/*
1019 			 * String property
1020 			 */
1021 			char *tmp = kmem_alloc(za.za_num_integers,
1022 			    KM_SLEEP);
1023 			err = zap_lookup(mos, propobj,
1024 			    za.za_name, 1, za.za_num_integers, tmp);
1025 			if (err != 0) {
1026 				kmem_free(tmp, za.za_num_integers);
1027 				break;
1028 			}
1029 			VERIFY(nvlist_add_string(propval, ZPROP_VALUE,
1030 			    tmp) == 0);
1031 			kmem_free(tmp, za.za_num_integers);
1032 		} else {
1033 			/*
1034 			 * Integer property
1035 			 */
1036 			ASSERT(za.za_integer_length == 8);
1037 			(void) nvlist_add_uint64(propval, ZPROP_VALUE,
1038 			    za.za_first_integer);
1039 		}
1040 
1041 		VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, source) == 0);
1042 		VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1043 		nvlist_free(propval);
1044 	}
1045 	zap_cursor_fini(&zc);
1046 	if (err == ENOENT)
1047 		err = 0;
1048 	return (err);
1049 }
1050 
1051 /*
1052  * Iterate over all properties for this dataset and return them in an nvlist.
1053  */
1054 static int
dsl_prop_get_all_ds(dsl_dataset_t * ds,nvlist_t ** nvp,dsl_prop_getflags_t flags)1055 dsl_prop_get_all_ds(dsl_dataset_t *ds, nvlist_t **nvp,
1056     dsl_prop_getflags_t flags)
1057 {
1058 	dsl_dir_t *dd = ds->ds_dir;
1059 	dsl_pool_t *dp = dd->dd_pool;
1060 	objset_t *mos = dp->dp_meta_objset;
1061 	int err = 0;
1062 	char setpoint[ZFS_MAX_DATASET_NAME_LEN];
1063 
1064 	VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1065 
1066 	if (ds->ds_is_snapshot)
1067 		flags |= DSL_PROP_GET_SNAPSHOT;
1068 
1069 	ASSERT(dsl_pool_config_held(dp));
1070 
1071 	if (dsl_dataset_phys(ds)->ds_props_obj != 0) {
1072 		ASSERT(flags & DSL_PROP_GET_SNAPSHOT);
1073 		dsl_dataset_name(ds, setpoint);
1074 		err = dsl_prop_get_all_impl(mos,
1075 		    dsl_dataset_phys(ds)->ds_props_obj, setpoint, flags, *nvp);
1076 		if (err)
1077 			goto out;
1078 	}
1079 
1080 	for (; dd != NULL; dd = dd->dd_parent) {
1081 		if (dd != ds->ds_dir || (flags & DSL_PROP_GET_SNAPSHOT)) {
1082 			if (flags & (DSL_PROP_GET_LOCAL |
1083 			    DSL_PROP_GET_RECEIVED))
1084 				break;
1085 			flags |= DSL_PROP_GET_INHERITING;
1086 		}
1087 		dsl_dir_name(dd, setpoint);
1088 		err = dsl_prop_get_all_impl(mos,
1089 		    dsl_dir_phys(dd)->dd_props_zapobj, setpoint, flags, *nvp);
1090 		if (err)
1091 			break;
1092 	}
1093 out:
1094 	return (err);
1095 }
1096 
1097 boolean_t
dsl_prop_get_hasrecvd(const char * dsname)1098 dsl_prop_get_hasrecvd(const char *dsname)
1099 {
1100 	uint64_t dummy;
1101 
1102 	return (0 ==
1103 	    dsl_prop_get_integer(dsname, ZPROP_HAS_RECVD, &dummy, NULL));
1104 }
1105 
1106 static int
dsl_prop_set_hasrecvd_impl(const char * dsname,zprop_source_t source)1107 dsl_prop_set_hasrecvd_impl(const char *dsname, zprop_source_t source)
1108 {
1109 	uint64_t version;
1110 	spa_t *spa;
1111 	int error = 0;
1112 
1113 	VERIFY0(spa_open(dsname, &spa, FTAG));
1114 	version = spa_version(spa);
1115 	spa_close(spa, FTAG);
1116 
1117 	if (version >= SPA_VERSION_RECVD_PROPS)
1118 		error = dsl_prop_set_int(dsname, ZPROP_HAS_RECVD, source, 0);
1119 	return (error);
1120 }
1121 
1122 /*
1123  * Call after successfully receiving properties to ensure that only the first
1124  * receive on or after SPA_VERSION_RECVD_PROPS blows away local properties.
1125  */
1126 int
dsl_prop_set_hasrecvd(const char * dsname)1127 dsl_prop_set_hasrecvd(const char *dsname)
1128 {
1129 	int error = 0;
1130 	if (!dsl_prop_get_hasrecvd(dsname))
1131 		error = dsl_prop_set_hasrecvd_impl(dsname, ZPROP_SRC_LOCAL);
1132 	return (error);
1133 }
1134 
1135 void
dsl_prop_unset_hasrecvd(const char * dsname)1136 dsl_prop_unset_hasrecvd(const char *dsname)
1137 {
1138 	VERIFY0(dsl_prop_set_hasrecvd_impl(dsname, ZPROP_SRC_NONE));
1139 }
1140 
1141 int
dsl_prop_get_all(objset_t * os,nvlist_t ** nvp)1142 dsl_prop_get_all(objset_t *os, nvlist_t **nvp)
1143 {
1144 	return (dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, 0));
1145 }
1146 
1147 int
dsl_prop_get_received(const char * dsname,nvlist_t ** nvp)1148 dsl_prop_get_received(const char *dsname, nvlist_t **nvp)
1149 {
1150 	objset_t *os;
1151 	int error;
1152 
1153 	/*
1154 	 * Received properties are not distinguishable from local properties
1155 	 * until the dataset has received properties on or after
1156 	 * SPA_VERSION_RECVD_PROPS.
1157 	 */
1158 	dsl_prop_getflags_t flags = (dsl_prop_get_hasrecvd(dsname) ?
1159 	    DSL_PROP_GET_RECEIVED : DSL_PROP_GET_LOCAL);
1160 
1161 	error = dmu_objset_hold(dsname, FTAG, &os);
1162 	if (error != 0)
1163 		return (error);
1164 	error = dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, flags);
1165 	dmu_objset_rele(os, FTAG);
1166 	return (error);
1167 }
1168 
1169 void
dsl_prop_nvlist_add_uint64(nvlist_t * nv,zfs_prop_t prop,uint64_t value)1170 dsl_prop_nvlist_add_uint64(nvlist_t *nv, zfs_prop_t prop, uint64_t value)
1171 {
1172 	nvlist_t *propval;
1173 	const char *propname = zfs_prop_to_name(prop);
1174 	uint64_t default_value;
1175 
1176 	if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1177 		VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1178 		return;
1179 	}
1180 
1181 	VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1182 	VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1183 	/* Indicate the default source if we can. */
1184 	if (dodefault(prop, 8, 1, &default_value) == 0 &&
1185 	    value == default_value) {
1186 		VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, "") == 0);
1187 	}
1188 	VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1189 	nvlist_free(propval);
1190 }
1191 
1192 void
dsl_prop_nvlist_add_string(nvlist_t * nv,zfs_prop_t prop,const char * value)1193 dsl_prop_nvlist_add_string(nvlist_t *nv, zfs_prop_t prop, const char *value)
1194 {
1195 	nvlist_t *propval;
1196 	const char *propname = zfs_prop_to_name(prop);
1197 
1198 	if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1199 		VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1200 		return;
1201 	}
1202 
1203 	VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1204 	VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1205 	VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1206 	nvlist_free(propval);
1207 }
1208