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 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <sys/zfs_context.h>
27 #include <sys/dmu.h>
28 #include <sys/dmu_objset.h>
29 #include <sys/dmu_tx.h>
30 #include <sys/dsl_dataset.h>
31 #include <sys/dsl_dir.h>
32 #include <sys/dsl_prop.h>
33 #include <sys/dsl_synctask.h>
34 #include <sys/spa.h>
35 #include <sys/zap.h>
36 #include <sys/fs/zfs.h>
37
38 #include "zfs_prop.h"
39
40 #define ZPROP_INHERIT_SUFFIX "$inherit"
41 #define ZPROP_RECVD_SUFFIX "$recvd"
42
43 static int
dodefault(const char * propname,int intsz,int numints,void * buf)44 dodefault(const char *propname, int intsz, int numints, void *buf)
45 {
46 zfs_prop_t prop;
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 = zfs_name_to_prop(propname)) == ZPROP_INVAL ||
54 (zfs_prop_readonly(prop) && !zfs_prop_setonce(prop)))
55 return (ENOENT);
56
57 if (zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
58 if (intsz != 1)
59 return (EOVERFLOW);
60 (void) strncpy(buf, zfs_prop_default_string(prop),
61 numints);
62 } else {
63 if (intsz != 8 || numints < 1)
64 return (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 = ENOENT;
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(RW_LOCK_HELD(&dd->dd_pool->dp_config_rwlock));
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 ASSERT(RW_LOCK_HELD(&dd->dd_pool->dp_config_rwlock));
101
102 if (dd != target || snapshot) {
103 if (!inheritable)
104 break;
105 inheriting = B_TRUE;
106 }
107
108 /* Check for a local value. */
109 err = zap_lookup(mos, dd->dd_phys->dd_props_zapobj, propname,
110 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, dd->dd_phys->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, dd->dd_phys->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) strcpy(setpoint,
136 ZPROP_SOURCE_VAL_RECVD);
137 }
138 }
139 break;
140 }
141 }
142
143 /*
144 * If we found an explicit inheritance entry, err is zero even
145 * though we haven't yet found the value, so reinitializing err
146 * at the end of the loop (instead of at the beginning) ensures
147 * that err has a valid post-loop value.
148 */
149 err = ENOENT;
150 }
151
152 if (err == ENOENT)
153 err = dodefault(propname, intsz, numints, buf);
154
155 strfree(inheritstr);
156 strfree(recvdstr);
157
158 return (err);
159 }
160
161 int
dsl_prop_get_ds(dsl_dataset_t * ds,const char * propname,int intsz,int numints,void * buf,char * setpoint)162 dsl_prop_get_ds(dsl_dataset_t *ds, const char *propname,
163 int intsz, int numints, void *buf, char *setpoint)
164 {
165 zfs_prop_t prop = zfs_name_to_prop(propname);
166 boolean_t inheritable;
167 boolean_t snapshot;
168 uint64_t zapobj;
169
170 ASSERT(RW_LOCK_HELD(&ds->ds_dir->dd_pool->dp_config_rwlock));
171 inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
172 snapshot = (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds));
173 zapobj = (ds->ds_phys == NULL ? 0 : ds->ds_phys->ds_props_obj);
174
175 if (zapobj != 0) {
176 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
177 int err;
178
179 ASSERT(snapshot);
180
181 /* Check for a local value. */
182 err = zap_lookup(mos, zapobj, propname, intsz, numints, buf);
183 if (err != ENOENT) {
184 if (setpoint != NULL && err == 0)
185 dsl_dataset_name(ds, setpoint);
186 return (err);
187 }
188
189 /*
190 * Skip the check for a received value if there is an explicit
191 * inheritance entry.
192 */
193 if (inheritable) {
194 char *inheritstr = kmem_asprintf("%s%s", propname,
195 ZPROP_INHERIT_SUFFIX);
196 err = zap_contains(mos, zapobj, inheritstr);
197 strfree(inheritstr);
198 if (err != 0 && err != ENOENT)
199 return (err);
200 }
201
202 if (err == ENOENT) {
203 /* Check for a received value. */
204 char *recvdstr = kmem_asprintf("%s%s", propname,
205 ZPROP_RECVD_SUFFIX);
206 err = zap_lookup(mos, zapobj, recvdstr,
207 intsz, numints, buf);
208 strfree(recvdstr);
209 if (err != ENOENT) {
210 if (setpoint != NULL && err == 0)
211 (void) strcpy(setpoint,
212 ZPROP_SOURCE_VAL_RECVD);
213 return (err);
214 }
215 }
216 }
217
218 return (dsl_prop_get_dd(ds->ds_dir, propname,
219 intsz, numints, buf, setpoint, snapshot));
220 }
221
222 /*
223 * Register interest in the named property. We'll call the callback
224 * once to notify it of the current property value, and again each time
225 * the property changes, until this callback is unregistered.
226 *
227 * Return 0 on success, errno if the prop is not an integer value.
228 */
229 int
dsl_prop_register(dsl_dataset_t * ds,const char * propname,dsl_prop_changed_cb_t * callback,void * cbarg)230 dsl_prop_register(dsl_dataset_t *ds, const char *propname,
231 dsl_prop_changed_cb_t *callback, void *cbarg)
232 {
233 dsl_dir_t *dd = ds->ds_dir;
234 dsl_pool_t *dp = dd->dd_pool;
235 uint64_t value;
236 dsl_prop_cb_record_t *cbr;
237 int err;
238 int need_rwlock;
239
240 need_rwlock = !RW_WRITE_HELD(&dp->dp_config_rwlock);
241 if (need_rwlock)
242 rw_enter(&dp->dp_config_rwlock, RW_READER);
243
244 err = dsl_prop_get_ds(ds, propname, 8, 1, &value, NULL);
245 if (err != 0) {
246 if (need_rwlock)
247 rw_exit(&dp->dp_config_rwlock);
248 return (err);
249 }
250
251 cbr = kmem_alloc(sizeof (dsl_prop_cb_record_t), KM_SLEEP);
252 cbr->cbr_ds = ds;
253 cbr->cbr_propname = kmem_alloc(strlen(propname)+1, KM_SLEEP);
254 (void) strcpy((char *)cbr->cbr_propname, propname);
255 cbr->cbr_func = callback;
256 cbr->cbr_arg = cbarg;
257 mutex_enter(&dd->dd_lock);
258 list_insert_head(&dd->dd_prop_cbs, cbr);
259 mutex_exit(&dd->dd_lock);
260
261 cbr->cbr_func(cbr->cbr_arg, value);
262
263 VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object,
264 NULL, cbr, &dd));
265 if (need_rwlock)
266 rw_exit(&dp->dp_config_rwlock);
267 /* Leave dir open until this callback is unregistered */
268 return (0);
269 }
270
271 int
dsl_prop_get(const char * dsname,const char * propname,int intsz,int numints,void * buf,char * setpoint)272 dsl_prop_get(const char *dsname, const char *propname,
273 int intsz, int numints, void *buf, char *setpoint)
274 {
275 dsl_dataset_t *ds;
276 int err;
277
278 err = dsl_dataset_hold(dsname, FTAG, &ds);
279 if (err)
280 return (err);
281
282 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
283 err = dsl_prop_get_ds(ds, propname, intsz, numints, buf, setpoint);
284 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
285
286 dsl_dataset_rele(ds, FTAG);
287 return (err);
288 }
289
290 /*
291 * Get the current property value. It may have changed by the time this
292 * function returns, so it is NOT safe to follow up with
293 * dsl_prop_register() and assume that the value has not changed in
294 * between.
295 *
296 * Return 0 on success, ENOENT if ddname is invalid.
297 */
298 int
dsl_prop_get_integer(const char * ddname,const char * propname,uint64_t * valuep,char * setpoint)299 dsl_prop_get_integer(const char *ddname, const char *propname,
300 uint64_t *valuep, char *setpoint)
301 {
302 return (dsl_prop_get(ddname, propname, 8, 1, valuep, setpoint));
303 }
304
305 void
dsl_prop_setarg_init_uint64(dsl_prop_setarg_t * psa,const char * propname,zprop_source_t source,uint64_t * value)306 dsl_prop_setarg_init_uint64(dsl_prop_setarg_t *psa, const char *propname,
307 zprop_source_t source, uint64_t *value)
308 {
309 psa->psa_name = propname;
310 psa->psa_source = source;
311 psa->psa_intsz = 8;
312 psa->psa_numints = 1;
313 psa->psa_value = value;
314
315 psa->psa_effective_value = -1ULL;
316 }
317
318 /*
319 * Predict the effective value of the given special property if it were set with
320 * the given value and source. This is not a general purpose function. It exists
321 * only to handle the special requirements of the quota and reservation
322 * properties. The fact that these properties are non-inheritable greatly
323 * simplifies the prediction logic.
324 *
325 * Returns 0 on success, a positive error code on failure, or -1 if called with
326 * a property not handled by this function.
327 */
328 int
dsl_prop_predict_sync(dsl_dir_t * dd,dsl_prop_setarg_t * psa)329 dsl_prop_predict_sync(dsl_dir_t *dd, dsl_prop_setarg_t *psa)
330 {
331 const char *propname = psa->psa_name;
332 zfs_prop_t prop = zfs_name_to_prop(propname);
333 zprop_source_t source = psa->psa_source;
334 objset_t *mos;
335 uint64_t zapobj;
336 uint64_t version;
337 char *recvdstr;
338 int err = 0;
339
340 switch (prop) {
341 case ZFS_PROP_QUOTA:
342 case ZFS_PROP_RESERVATION:
343 case ZFS_PROP_REFQUOTA:
344 case ZFS_PROP_REFRESERVATION:
345 break;
346 default:
347 return (-1);
348 }
349
350 mos = dd->dd_pool->dp_meta_objset;
351 zapobj = dd->dd_phys->dd_props_zapobj;
352 recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
353
354 version = spa_version(dd->dd_pool->dp_spa);
355 if (version < SPA_VERSION_RECVD_PROPS) {
356 if (source & ZPROP_SRC_NONE)
357 source = ZPROP_SRC_NONE;
358 else if (source & ZPROP_SRC_RECEIVED)
359 source = ZPROP_SRC_LOCAL;
360 }
361
362 switch (source) {
363 case ZPROP_SRC_NONE:
364 /* Revert to the received value, if any. */
365 err = zap_lookup(mos, zapobj, recvdstr, 8, 1,
366 &psa->psa_effective_value);
367 if (err == ENOENT)
368 psa->psa_effective_value = 0;
369 break;
370 case ZPROP_SRC_LOCAL:
371 psa->psa_effective_value = *(uint64_t *)psa->psa_value;
372 break;
373 case ZPROP_SRC_RECEIVED:
374 /*
375 * If there's no local setting, then the new received value will
376 * be the effective value.
377 */
378 err = zap_lookup(mos, zapobj, propname, 8, 1,
379 &psa->psa_effective_value);
380 if (err == ENOENT)
381 psa->psa_effective_value = *(uint64_t *)psa->psa_value;
382 break;
383 case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
384 /*
385 * We're clearing the received value, so the local setting (if
386 * it exists) remains the effective value.
387 */
388 err = zap_lookup(mos, zapobj, propname, 8, 1,
389 &psa->psa_effective_value);
390 if (err == ENOENT)
391 psa->psa_effective_value = 0;
392 break;
393 default:
394 cmn_err(CE_PANIC, "unexpected property source: %d", source);
395 }
396
397 strfree(recvdstr);
398
399 if (err == ENOENT)
400 return (0);
401
402 return (err);
403 }
404
405 #ifdef ZFS_DEBUG
406 void
dsl_prop_check_prediction(dsl_dir_t * dd,dsl_prop_setarg_t * psa)407 dsl_prop_check_prediction(dsl_dir_t *dd, dsl_prop_setarg_t *psa)
408 {
409 zfs_prop_t prop = zfs_name_to_prop(psa->psa_name);
410 uint64_t intval;
411 char setpoint[MAXNAMELEN];
412 uint64_t version = spa_version(dd->dd_pool->dp_spa);
413 int err;
414
415 if (version < SPA_VERSION_RECVD_PROPS) {
416 switch (prop) {
417 case ZFS_PROP_QUOTA:
418 case ZFS_PROP_RESERVATION:
419 return;
420 }
421 }
422
423 err = dsl_prop_get_dd(dd, psa->psa_name, 8, 1, &intval,
424 setpoint, B_FALSE);
425 if (err == 0 && intval != psa->psa_effective_value) {
426 cmn_err(CE_PANIC, "%s property, source: %x, "
427 "predicted effective value: %llu, "
428 "actual effective value: %llu (setpoint: %s)",
429 psa->psa_name, psa->psa_source,
430 (unsigned long long)psa->psa_effective_value,
431 (unsigned long long)intval, setpoint);
432 }
433 }
434 #endif
435
436 /*
437 * Unregister this callback. Return 0 on success, ENOENT if ddname is
438 * invalid, ENOMSG if no matching callback registered.
439 */
440 int
dsl_prop_unregister(dsl_dataset_t * ds,const char * propname,dsl_prop_changed_cb_t * callback,void * cbarg)441 dsl_prop_unregister(dsl_dataset_t *ds, const char *propname,
442 dsl_prop_changed_cb_t *callback, void *cbarg)
443 {
444 dsl_dir_t *dd = ds->ds_dir;
445 dsl_prop_cb_record_t *cbr;
446
447 mutex_enter(&dd->dd_lock);
448 for (cbr = list_head(&dd->dd_prop_cbs);
449 cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) {
450 if (cbr->cbr_ds == ds &&
451 cbr->cbr_func == callback &&
452 cbr->cbr_arg == cbarg &&
453 strcmp(cbr->cbr_propname, propname) == 0)
454 break;
455 }
456
457 if (cbr == NULL) {
458 mutex_exit(&dd->dd_lock);
459 return (ENOMSG);
460 }
461
462 list_remove(&dd->dd_prop_cbs, cbr);
463 mutex_exit(&dd->dd_lock);
464 kmem_free((void*)cbr->cbr_propname, strlen(cbr->cbr_propname)+1);
465 kmem_free(cbr, sizeof (dsl_prop_cb_record_t));
466
467 /* Clean up from dsl_prop_register */
468 dsl_dir_close(dd, cbr);
469 return (0);
470 }
471
472 /*
473 * Return the number of callbacks that are registered for this dataset.
474 */
475 int
dsl_prop_numcb(dsl_dataset_t * ds)476 dsl_prop_numcb(dsl_dataset_t *ds)
477 {
478 dsl_dir_t *dd = ds->ds_dir;
479 dsl_prop_cb_record_t *cbr;
480 int num = 0;
481
482 mutex_enter(&dd->dd_lock);
483 for (cbr = list_head(&dd->dd_prop_cbs);
484 cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) {
485 if (cbr->cbr_ds == ds)
486 num++;
487 }
488 mutex_exit(&dd->dd_lock);
489
490 return (num);
491 }
492
493 static void
dsl_prop_changed_notify(dsl_pool_t * dp,uint64_t ddobj,const char * propname,uint64_t value,int first)494 dsl_prop_changed_notify(dsl_pool_t *dp, uint64_t ddobj,
495 const char *propname, uint64_t value, int first)
496 {
497 dsl_dir_t *dd;
498 dsl_prop_cb_record_t *cbr;
499 objset_t *mos = dp->dp_meta_objset;
500 zap_cursor_t zc;
501 zap_attribute_t *za;
502 int err;
503
504 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock));
505 err = dsl_dir_open_obj(dp, ddobj, NULL, FTAG, &dd);
506 if (err)
507 return;
508
509 if (!first) {
510 /*
511 * If the prop is set here, then this change is not
512 * being inherited here or below; stop the recursion.
513 */
514 err = zap_contains(mos, dd->dd_phys->dd_props_zapobj, propname);
515 if (err == 0) {
516 dsl_dir_close(dd, FTAG);
517 return;
518 }
519 ASSERT3U(err, ==, ENOENT);
520 }
521
522 mutex_enter(&dd->dd_lock);
523 for (cbr = list_head(&dd->dd_prop_cbs); cbr;
524 cbr = list_next(&dd->dd_prop_cbs, cbr)) {
525 uint64_t propobj = cbr->cbr_ds->ds_phys->ds_props_obj;
526
527 if (strcmp(cbr->cbr_propname, propname) != 0)
528 continue;
529
530 /*
531 * If the property is set on this ds, then it is not
532 * inherited here; don't call the callback.
533 */
534 if (propobj && 0 == zap_contains(mos, propobj, propname))
535 continue;
536
537 cbr->cbr_func(cbr->cbr_arg, value);
538 }
539 mutex_exit(&dd->dd_lock);
540
541 za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
542 for (zap_cursor_init(&zc, mos,
543 dd->dd_phys->dd_child_dir_zapobj);
544 zap_cursor_retrieve(&zc, za) == 0;
545 zap_cursor_advance(&zc)) {
546 dsl_prop_changed_notify(dp, za->za_first_integer,
547 propname, value, FALSE);
548 }
549 kmem_free(za, sizeof (zap_attribute_t));
550 zap_cursor_fini(&zc);
551 dsl_dir_close(dd, FTAG);
552 }
553
554 void
dsl_prop_set_sync(void * arg1,void * arg2,cred_t * cr,dmu_tx_t * tx)555 dsl_prop_set_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
556 {
557 dsl_dataset_t *ds = arg1;
558 dsl_prop_setarg_t *psa = arg2;
559 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
560 uint64_t zapobj, intval, dummy;
561 int isint;
562 char valbuf[32];
563 char *valstr = NULL;
564 char *inheritstr;
565 char *recvdstr;
566 char *tbuf = NULL;
567 int err;
568 uint64_t version = spa_version(ds->ds_dir->dd_pool->dp_spa);
569 const char *propname = psa->psa_name;
570 zprop_source_t source = psa->psa_source;
571
572 isint = (dodefault(propname, 8, 1, &intval) == 0);
573
574 if (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds)) {
575 ASSERT(version >= SPA_VERSION_SNAP_PROPS);
576 if (ds->ds_phys->ds_props_obj == 0) {
577 dmu_buf_will_dirty(ds->ds_dbuf, tx);
578 ds->ds_phys->ds_props_obj =
579 zap_create(mos,
580 DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
581 }
582 zapobj = ds->ds_phys->ds_props_obj;
583 } else {
584 zapobj = ds->ds_dir->dd_phys->dd_props_zapobj;
585 }
586
587 if (version < SPA_VERSION_RECVD_PROPS) {
588 zfs_prop_t prop = zfs_name_to_prop(propname);
589 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION)
590 return;
591
592 if (source & ZPROP_SRC_NONE)
593 source = ZPROP_SRC_NONE;
594 else if (source & ZPROP_SRC_RECEIVED)
595 source = ZPROP_SRC_LOCAL;
596 }
597
598 inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
599 recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
600
601 switch (source) {
602 case ZPROP_SRC_NONE:
603 /*
604 * revert to received value, if any (inherit -S)
605 * - remove propname
606 * - remove propname$inherit
607 */
608 err = zap_remove(mos, zapobj, propname, tx);
609 ASSERT(err == 0 || err == ENOENT);
610 err = zap_remove(mos, zapobj, inheritstr, tx);
611 ASSERT(err == 0 || err == ENOENT);
612 break;
613 case ZPROP_SRC_LOCAL:
614 /*
615 * remove propname$inherit
616 * set propname -> value
617 */
618 err = zap_remove(mos, zapobj, inheritstr, tx);
619 ASSERT(err == 0 || err == ENOENT);
620 VERIFY(0 == zap_update(mos, zapobj, propname,
621 psa->psa_intsz, psa->psa_numints, psa->psa_value, tx));
622 break;
623 case ZPROP_SRC_INHERITED:
624 /*
625 * explicitly inherit
626 * - remove propname
627 * - set propname$inherit
628 */
629 err = zap_remove(mos, zapobj, propname, tx);
630 ASSERT(err == 0 || err == ENOENT);
631 if (version >= SPA_VERSION_RECVD_PROPS &&
632 zap_contains(mos, zapobj, ZPROP_HAS_RECVD) == 0) {
633 dummy = 0;
634 err = zap_update(mos, zapobj, inheritstr,
635 8, 1, &dummy, tx);
636 ASSERT(err == 0);
637 }
638 break;
639 case ZPROP_SRC_RECEIVED:
640 /*
641 * set propname$recvd -> value
642 */
643 err = zap_update(mos, zapobj, recvdstr,
644 psa->psa_intsz, psa->psa_numints, psa->psa_value, tx);
645 ASSERT(err == 0);
646 break;
647 case (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED):
648 /*
649 * clear local and received settings
650 * - remove propname
651 * - remove propname$inherit
652 * - remove propname$recvd
653 */
654 err = zap_remove(mos, zapobj, propname, tx);
655 ASSERT(err == 0 || err == ENOENT);
656 err = zap_remove(mos, zapobj, inheritstr, tx);
657 ASSERT(err == 0 || err == ENOENT);
658 /* FALLTHRU */
659 case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
660 /*
661 * remove propname$recvd
662 */
663 err = zap_remove(mos, zapobj, recvdstr, tx);
664 ASSERT(err == 0 || err == ENOENT);
665 break;
666 default:
667 cmn_err(CE_PANIC, "unexpected property source: %d", source);
668 }
669
670 strfree(inheritstr);
671 strfree(recvdstr);
672
673 if (isint) {
674 VERIFY(0 == dsl_prop_get_ds(ds, propname, 8, 1, &intval, NULL));
675
676 if (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds)) {
677 dsl_prop_cb_record_t *cbr;
678 /*
679 * It's a snapshot; nothing can inherit this
680 * property, so just look for callbacks on this
681 * ds here.
682 */
683 mutex_enter(&ds->ds_dir->dd_lock);
684 for (cbr = list_head(&ds->ds_dir->dd_prop_cbs); cbr;
685 cbr = list_next(&ds->ds_dir->dd_prop_cbs, cbr)) {
686 if (cbr->cbr_ds == ds &&
687 strcmp(cbr->cbr_propname, propname) == 0)
688 cbr->cbr_func(cbr->cbr_arg, intval);
689 }
690 mutex_exit(&ds->ds_dir->dd_lock);
691 } else {
692 dsl_prop_changed_notify(ds->ds_dir->dd_pool,
693 ds->ds_dir->dd_object, propname, intval, TRUE);
694 }
695
696 (void) snprintf(valbuf, sizeof (valbuf),
697 "%lld", (longlong_t)intval);
698 valstr = valbuf;
699 } else {
700 if (source == ZPROP_SRC_LOCAL) {
701 valstr = (char *)psa->psa_value;
702 } else {
703 tbuf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
704 if (dsl_prop_get_ds(ds, propname, 1,
705 ZAP_MAXVALUELEN, tbuf, NULL) == 0)
706 valstr = tbuf;
707 }
708 }
709
710 spa_history_internal_log((source == ZPROP_SRC_NONE ||
711 source == ZPROP_SRC_INHERITED) ? LOG_DS_INHERIT :
712 LOG_DS_PROPSET, ds->ds_dir->dd_pool->dp_spa, tx, cr,
713 "%s=%s dataset = %llu", propname,
714 (valstr == NULL ? "" : valstr), ds->ds_object);
715
716 if (tbuf != NULL)
717 kmem_free(tbuf, ZAP_MAXVALUELEN);
718 }
719
720 void
dsl_props_set_sync(void * arg1,void * arg2,cred_t * cr,dmu_tx_t * tx)721 dsl_props_set_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
722 {
723 dsl_dataset_t *ds = arg1;
724 dsl_props_arg_t *pa = arg2;
725 nvlist_t *props = pa->pa_props;
726 dsl_prop_setarg_t psa;
727 nvpair_t *elem = NULL;
728
729 psa.psa_source = pa->pa_source;
730
731 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
732 nvpair_t *pair = elem;
733
734 psa.psa_name = nvpair_name(pair);
735
736 if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
737 /*
738 * dsl_prop_get_all_impl() returns properties in this
739 * format.
740 */
741 nvlist_t *attrs;
742 VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
743 VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
744 &pair) == 0);
745 }
746
747 if (nvpair_type(pair) == DATA_TYPE_STRING) {
748 VERIFY(nvpair_value_string(pair,
749 (char **)&psa.psa_value) == 0);
750 psa.psa_intsz = 1;
751 psa.psa_numints = strlen(psa.psa_value) + 1;
752 } else {
753 uint64_t intval;
754 VERIFY(nvpair_value_uint64(pair, &intval) == 0);
755 psa.psa_intsz = sizeof (intval);
756 psa.psa_numints = 1;
757 psa.psa_value = &intval;
758 }
759 dsl_prop_set_sync(ds, &psa, cr, tx);
760 }
761 }
762
763 void
dsl_dir_prop_set_uint64_sync(dsl_dir_t * dd,const char * name,uint64_t val,cred_t * cr,dmu_tx_t * tx)764 dsl_dir_prop_set_uint64_sync(dsl_dir_t *dd, const char *name, uint64_t val,
765 cred_t *cr, dmu_tx_t *tx)
766 {
767 objset_t *mos = dd->dd_pool->dp_meta_objset;
768 uint64_t zapobj = dd->dd_phys->dd_props_zapobj;
769
770 ASSERT(dmu_tx_is_syncing(tx));
771
772 VERIFY(0 == zap_update(mos, zapobj, name, sizeof (val), 1, &val, tx));
773
774 dsl_prop_changed_notify(dd->dd_pool, dd->dd_object, name, val, TRUE);
775
776 spa_history_internal_log(LOG_DS_PROPSET, dd->dd_pool->dp_spa, tx, cr,
777 "%s=%llu dataset = %llu", name, (u_longlong_t)val,
778 dd->dd_phys->dd_head_dataset_obj);
779 }
780
781 int
dsl_prop_set(const char * dsname,const char * propname,zprop_source_t source,int intsz,int numints,const void * buf)782 dsl_prop_set(const char *dsname, const char *propname, zprop_source_t source,
783 int intsz, int numints, const void *buf)
784 {
785 dsl_dataset_t *ds;
786 uint64_t version;
787 int err;
788 dsl_prop_setarg_t psa;
789
790 /*
791 * We must do these checks before we get to the syncfunc, since
792 * it can't fail.
793 */
794 if (strlen(propname) >= ZAP_MAXNAMELEN)
795 return (ENAMETOOLONG);
796
797 err = dsl_dataset_hold(dsname, FTAG, &ds);
798 if (err)
799 return (err);
800
801 version = spa_version(ds->ds_dir->dd_pool->dp_spa);
802 if (intsz * numints >= (version < SPA_VERSION_STMF_PROP ?
803 ZAP_OLDMAXVALUELEN : ZAP_MAXVALUELEN)) {
804 dsl_dataset_rele(ds, FTAG);
805 return (E2BIG);
806 }
807 if (dsl_dataset_is_snapshot(ds) &&
808 version < SPA_VERSION_SNAP_PROPS) {
809 dsl_dataset_rele(ds, FTAG);
810 return (ENOTSUP);
811 }
812
813 psa.psa_name = propname;
814 psa.psa_source = source;
815 psa.psa_intsz = intsz;
816 psa.psa_numints = numints;
817 psa.psa_value = buf;
818 psa.psa_effective_value = -1ULL;
819
820 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
821 NULL, dsl_prop_set_sync, ds, &psa, 2);
822
823 dsl_dataset_rele(ds, FTAG);
824 return (err);
825 }
826
827 int
dsl_props_set(const char * dsname,zprop_source_t source,nvlist_t * props)828 dsl_props_set(const char *dsname, zprop_source_t source, nvlist_t *props)
829 {
830 dsl_dataset_t *ds;
831 uint64_t version;
832 nvpair_t *elem = NULL;
833 dsl_props_arg_t pa;
834 int err;
835
836 if (err = dsl_dataset_hold(dsname, FTAG, &ds))
837 return (err);
838 /*
839 * Do these checks before the syncfunc, since it can't fail.
840 */
841 version = spa_version(ds->ds_dir->dd_pool->dp_spa);
842 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
843 if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
844 dsl_dataset_rele(ds, FTAG);
845 return (ENAMETOOLONG);
846 }
847 if (nvpair_type(elem) == DATA_TYPE_STRING) {
848 char *valstr;
849 VERIFY(nvpair_value_string(elem, &valstr) == 0);
850 if (strlen(valstr) >= (version <
851 SPA_VERSION_STMF_PROP ?
852 ZAP_OLDMAXVALUELEN : ZAP_MAXVALUELEN)) {
853 dsl_dataset_rele(ds, FTAG);
854 return (E2BIG);
855 }
856 }
857 }
858
859 if (dsl_dataset_is_snapshot(ds) &&
860 version < SPA_VERSION_SNAP_PROPS) {
861 dsl_dataset_rele(ds, FTAG);
862 return (ENOTSUP);
863 }
864
865 pa.pa_props = props;
866 pa.pa_source = source;
867
868 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
869 NULL, dsl_props_set_sync, ds, &pa, 2);
870
871 dsl_dataset_rele(ds, FTAG);
872 return (err);
873 }
874
875 typedef enum dsl_prop_getflags {
876 DSL_PROP_GET_INHERITING = 0x1, /* searching parent of target ds */
877 DSL_PROP_GET_SNAPSHOT = 0x2, /* snapshot dataset */
878 DSL_PROP_GET_LOCAL = 0x4, /* local properties */
879 DSL_PROP_GET_RECEIVED = 0x8 /* received properties */
880 } dsl_prop_getflags_t;
881
882 static int
dsl_prop_get_all_impl(objset_t * mos,uint64_t propobj,const char * setpoint,dsl_prop_getflags_t flags,nvlist_t * nv)883 dsl_prop_get_all_impl(objset_t *mos, uint64_t propobj,
884 const char *setpoint, dsl_prop_getflags_t flags, nvlist_t *nv)
885 {
886 zap_cursor_t zc;
887 zap_attribute_t za;
888 int err = 0;
889
890 for (zap_cursor_init(&zc, mos, propobj);
891 (err = zap_cursor_retrieve(&zc, &za)) == 0;
892 zap_cursor_advance(&zc)) {
893 nvlist_t *propval;
894 zfs_prop_t prop;
895 char buf[ZAP_MAXNAMELEN];
896 char *valstr;
897 const char *suffix;
898 const char *propname;
899 const char *source;
900
901 suffix = strchr(za.za_name, '$');
902
903 if (suffix == NULL) {
904 /*
905 * Skip local properties if we only want received
906 * properties.
907 */
908 if (flags & DSL_PROP_GET_RECEIVED)
909 continue;
910
911 propname = za.za_name;
912 source = setpoint;
913 } else if (strcmp(suffix, ZPROP_INHERIT_SUFFIX) == 0) {
914 /* Skip explicitly inherited entries. */
915 continue;
916 } else if (strcmp(suffix, ZPROP_RECVD_SUFFIX) == 0) {
917 if (flags & DSL_PROP_GET_LOCAL)
918 continue;
919
920 (void) strncpy(buf, za.za_name, (suffix - za.za_name));
921 buf[suffix - za.za_name] = '\0';
922 propname = buf;
923
924 if (!(flags & DSL_PROP_GET_RECEIVED)) {
925 /* Skip if locally overridden. */
926 err = zap_contains(mos, propobj, propname);
927 if (err == 0)
928 continue;
929 if (err != ENOENT)
930 break;
931
932 /* Skip if explicitly inherited. */
933 valstr = kmem_asprintf("%s%s", propname,
934 ZPROP_INHERIT_SUFFIX);
935 err = zap_contains(mos, propobj, valstr);
936 strfree(valstr);
937 if (err == 0)
938 continue;
939 if (err != ENOENT)
940 break;
941 }
942
943 source = ((flags & DSL_PROP_GET_INHERITING) ?
944 setpoint : ZPROP_SOURCE_VAL_RECVD);
945 } else {
946 /*
947 * For backward compatibility, skip suffixes we don't
948 * recognize.
949 */
950 continue;
951 }
952
953 prop = zfs_name_to_prop(propname);
954
955 /* Skip non-inheritable properties. */
956 if ((flags & DSL_PROP_GET_INHERITING) && prop != ZPROP_INVAL &&
957 !zfs_prop_inheritable(prop))
958 continue;
959
960 /* Skip properties not valid for this type. */
961 if ((flags & DSL_PROP_GET_SNAPSHOT) && prop != ZPROP_INVAL &&
962 !zfs_prop_valid_for_type(prop, ZFS_TYPE_SNAPSHOT))
963 continue;
964
965 /* Skip properties already defined. */
966 if (nvlist_exists(nv, propname))
967 continue;
968
969 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
970 if (za.za_integer_length == 1) {
971 /*
972 * String property
973 */
974 char *tmp = kmem_alloc(za.za_num_integers,
975 KM_SLEEP);
976 err = zap_lookup(mos, propobj,
977 za.za_name, 1, za.za_num_integers, tmp);
978 if (err != 0) {
979 kmem_free(tmp, za.za_num_integers);
980 break;
981 }
982 VERIFY(nvlist_add_string(propval, ZPROP_VALUE,
983 tmp) == 0);
984 kmem_free(tmp, za.za_num_integers);
985 } else {
986 /*
987 * Integer property
988 */
989 ASSERT(za.za_integer_length == 8);
990 (void) nvlist_add_uint64(propval, ZPROP_VALUE,
991 za.za_first_integer);
992 }
993
994 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, source) == 0);
995 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
996 nvlist_free(propval);
997 }
998 zap_cursor_fini(&zc);
999 if (err == ENOENT)
1000 err = 0;
1001 return (err);
1002 }
1003
1004 /*
1005 * Iterate over all properties for this dataset and return them in an nvlist.
1006 */
1007 static int
dsl_prop_get_all_ds(dsl_dataset_t * ds,nvlist_t ** nvp,dsl_prop_getflags_t flags)1008 dsl_prop_get_all_ds(dsl_dataset_t *ds, nvlist_t **nvp,
1009 dsl_prop_getflags_t flags)
1010 {
1011 dsl_dir_t *dd = ds->ds_dir;
1012 dsl_pool_t *dp = dd->dd_pool;
1013 objset_t *mos = dp->dp_meta_objset;
1014 int err = 0;
1015 char setpoint[MAXNAMELEN];
1016
1017 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1018
1019 if (dsl_dataset_is_snapshot(ds))
1020 flags |= DSL_PROP_GET_SNAPSHOT;
1021
1022 rw_enter(&dp->dp_config_rwlock, RW_READER);
1023
1024 if (ds->ds_phys->ds_props_obj != 0) {
1025 ASSERT(flags & DSL_PROP_GET_SNAPSHOT);
1026 dsl_dataset_name(ds, setpoint);
1027 err = dsl_prop_get_all_impl(mos, ds->ds_phys->ds_props_obj,
1028 setpoint, flags, *nvp);
1029 if (err)
1030 goto out;
1031 }
1032
1033 for (; dd != NULL; dd = dd->dd_parent) {
1034 if (dd != ds->ds_dir || (flags & DSL_PROP_GET_SNAPSHOT)) {
1035 if (flags & (DSL_PROP_GET_LOCAL |
1036 DSL_PROP_GET_RECEIVED))
1037 break;
1038 flags |= DSL_PROP_GET_INHERITING;
1039 }
1040 dsl_dir_name(dd, setpoint);
1041 err = dsl_prop_get_all_impl(mos, dd->dd_phys->dd_props_zapobj,
1042 setpoint, flags, *nvp);
1043 if (err)
1044 break;
1045 }
1046 out:
1047 rw_exit(&dp->dp_config_rwlock);
1048 return (err);
1049 }
1050
1051 boolean_t
dsl_prop_get_hasrecvd(objset_t * os)1052 dsl_prop_get_hasrecvd(objset_t *os)
1053 {
1054 dsl_dataset_t *ds = os->os_dsl_dataset;
1055 int rc;
1056 uint64_t dummy;
1057
1058 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
1059 rc = dsl_prop_get_ds(ds, ZPROP_HAS_RECVD, 8, 1, &dummy, NULL);
1060 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
1061 ASSERT(rc != 0 || spa_version(os->os_spa) >= SPA_VERSION_RECVD_PROPS);
1062 return (rc == 0);
1063 }
1064
1065 static void
dsl_prop_set_hasrecvd_impl(objset_t * os,zprop_source_t source)1066 dsl_prop_set_hasrecvd_impl(objset_t *os, zprop_source_t source)
1067 {
1068 dsl_dataset_t *ds = os->os_dsl_dataset;
1069 uint64_t dummy = 0;
1070 dsl_prop_setarg_t psa;
1071
1072 if (spa_version(os->os_spa) < SPA_VERSION_RECVD_PROPS)
1073 return;
1074
1075 dsl_prop_setarg_init_uint64(&psa, ZPROP_HAS_RECVD, source, &dummy);
1076
1077 (void) dsl_sync_task_do(ds->ds_dir->dd_pool, NULL,
1078 dsl_prop_set_sync, ds, &psa, 2);
1079 }
1080
1081 /*
1082 * Call after successfully receiving properties to ensure that only the first
1083 * receive on or after SPA_VERSION_RECVD_PROPS blows away local properties.
1084 */
1085 void
dsl_prop_set_hasrecvd(objset_t * os)1086 dsl_prop_set_hasrecvd(objset_t *os)
1087 {
1088 if (dsl_prop_get_hasrecvd(os)) {
1089 ASSERT(spa_version(os->os_spa) >= SPA_VERSION_RECVD_PROPS);
1090 return;
1091 }
1092 dsl_prop_set_hasrecvd_impl(os, ZPROP_SRC_LOCAL);
1093 }
1094
1095 void
dsl_prop_unset_hasrecvd(objset_t * os)1096 dsl_prop_unset_hasrecvd(objset_t *os)
1097 {
1098 dsl_prop_set_hasrecvd_impl(os, ZPROP_SRC_NONE);
1099 }
1100
1101 int
dsl_prop_get_all(objset_t * os,nvlist_t ** nvp)1102 dsl_prop_get_all(objset_t *os, nvlist_t **nvp)
1103 {
1104 return (dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, 0));
1105 }
1106
1107 int
dsl_prop_get_received(objset_t * os,nvlist_t ** nvp)1108 dsl_prop_get_received(objset_t *os, nvlist_t **nvp)
1109 {
1110 /*
1111 * Received properties are not distinguishable from local properties
1112 * until the dataset has received properties on or after
1113 * SPA_VERSION_RECVD_PROPS.
1114 */
1115 dsl_prop_getflags_t flags = (dsl_prop_get_hasrecvd(os) ?
1116 DSL_PROP_GET_RECEIVED : DSL_PROP_GET_LOCAL);
1117 return (dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, flags));
1118 }
1119
1120 void
dsl_prop_nvlist_add_uint64(nvlist_t * nv,zfs_prop_t prop,uint64_t value)1121 dsl_prop_nvlist_add_uint64(nvlist_t *nv, zfs_prop_t prop, uint64_t value)
1122 {
1123 nvlist_t *propval;
1124 const char *propname = zfs_prop_to_name(prop);
1125 uint64_t default_value;
1126
1127 if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1128 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1129 return;
1130 }
1131
1132 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1133 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1134 /* Indicate the default source if we can. */
1135 if (dodefault(propname, 8, 1, &default_value) == 0 &&
1136 value == default_value) {
1137 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, "") == 0);
1138 }
1139 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1140 nvlist_free(propval);
1141 }
1142
1143 void
dsl_prop_nvlist_add_string(nvlist_t * nv,zfs_prop_t prop,const char * value)1144 dsl_prop_nvlist_add_string(nvlist_t *nv, zfs_prop_t prop, const char *value)
1145 {
1146 nvlist_t *propval;
1147 const char *propname = zfs_prop_to_name(prop);
1148
1149 if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1150 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1151 return;
1152 }
1153
1154 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1155 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1156 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1157 nvlist_free(propval);
1158 }
1159