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, 2014 by Delphix. All rights reserved.
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 (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 = 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(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 break;
103 inheriting = B_TRUE;
104 }
105
106 /* Check for a local value. */
107 err = zap_lookup(mos, dsl_dir_phys(dd)->dd_props_zapobj,
108 propname, intsz, numints, buf);
109 if (err != ENOENT) {
110 if (setpoint != NULL && err == 0)
111 dsl_dir_name(dd, setpoint);
112 break;
113 }
114
115 /*
116 * Skip the check for a received value if there is an explicit
117 * inheritance entry.
118 */
119 err = zap_contains(mos, dsl_dir_phys(dd)->dd_props_zapobj,
120 inheritstr);
121 if (err != 0 && err != ENOENT)
122 break;
123
124 if (err == ENOENT) {
125 /* Check for a received value. */
126 err = zap_lookup(mos, dsl_dir_phys(dd)->dd_props_zapobj,
127 recvdstr, intsz, numints, buf);
128 if (err != ENOENT) {
129 if (setpoint != NULL && err == 0) {
130 if (inheriting) {
131 dsl_dir_name(dd, setpoint);
132 } else {
133 (void) strcpy(setpoint,
134 ZPROP_SOURCE_VAL_RECVD);
135 }
136 }
137 break;
138 }
139 }
140
141 /*
142 * If we found an explicit inheritance entry, err is zero even
143 * though we haven't yet found the value, so reinitializing err
144 * at the end of the loop (instead of at the beginning) ensures
145 * that err has a valid post-loop value.
146 */
147 err = SET_ERROR(ENOENT);
148 }
149
150 if (err == ENOENT)
151 err = dodefault(propname, intsz, numints, buf);
152
153 strfree(inheritstr);
154 strfree(recvdstr);
155
156 return (err);
157 }
158
159 int
dsl_prop_get_ds(dsl_dataset_t * ds,const char * propname,int intsz,int numints,void * buf,char * setpoint)160 dsl_prop_get_ds(dsl_dataset_t *ds, const char *propname,
161 int intsz, int numints, void *buf, char *setpoint)
162 {
163 zfs_prop_t prop = zfs_name_to_prop(propname);
164 boolean_t inheritable;
165 boolean_t snapshot;
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 snapshot = dsl_dataset_is_snapshot(ds);
171 zapobj = dsl_dataset_phys(ds)->ds_props_obj;
172
173 if (zapobj != 0) {
174 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
175 int err;
176
177 ASSERT(snapshot);
178
179 /* Check for a local value. */
180 err = zap_lookup(mos, zapobj, propname, intsz, numints, buf);
181 if (err != ENOENT) {
182 if (setpoint != NULL && err == 0)
183 dsl_dataset_name(ds, setpoint);
184 return (err);
185 }
186
187 /*
188 * Skip the check for a received value if there is an explicit
189 * inheritance entry.
190 */
191 if (inheritable) {
192 char *inheritstr = kmem_asprintf("%s%s", propname,
193 ZPROP_INHERIT_SUFFIX);
194 err = zap_contains(mos, zapobj, inheritstr);
195 strfree(inheritstr);
196 if (err != 0 && err != ENOENT)
197 return (err);
198 }
199
200 if (err == ENOENT) {
201 /* Check for a received value. */
202 char *recvdstr = kmem_asprintf("%s%s", propname,
203 ZPROP_RECVD_SUFFIX);
204 err = zap_lookup(mos, zapobj, recvdstr,
205 intsz, numints, buf);
206 strfree(recvdstr);
207 if (err != ENOENT) {
208 if (setpoint != NULL && err == 0)
209 (void) strcpy(setpoint,
210 ZPROP_SOURCE_VAL_RECVD);
211 return (err);
212 }
213 }
214 }
215
216 return (dsl_prop_get_dd(ds->ds_dir, propname,
217 intsz, numints, buf, setpoint, snapshot));
218 }
219
220 /*
221 * Register interest in the named property. We'll call the callback
222 * once to notify it of the current property value, and again each time
223 * the property changes, until this callback is unregistered.
224 *
225 * Return 0 on success, errno if the prop is not an integer value.
226 */
227 int
dsl_prop_register(dsl_dataset_t * ds,const char * propname,dsl_prop_changed_cb_t * callback,void * cbarg)228 dsl_prop_register(dsl_dataset_t *ds, const char *propname,
229 dsl_prop_changed_cb_t *callback, void *cbarg)
230 {
231 dsl_dir_t *dd = ds->ds_dir;
232 dsl_pool_t *dp = dd->dd_pool;
233 uint64_t value;
234 dsl_prop_cb_record_t *cbr;
235 int err;
236
237 ASSERT(dsl_pool_config_held(dp));
238
239 err = dsl_prop_get_int_ds(ds, propname, &value);
240 if (err != 0)
241 return (err);
242
243 cbr = kmem_alloc(sizeof (dsl_prop_cb_record_t), KM_SLEEP);
244 cbr->cbr_ds = ds;
245 cbr->cbr_propname = kmem_alloc(strlen(propname)+1, KM_SLEEP);
246 (void) strcpy((char *)cbr->cbr_propname, propname);
247 cbr->cbr_func = callback;
248 cbr->cbr_arg = cbarg;
249 mutex_enter(&dd->dd_lock);
250 list_insert_head(&dd->dd_prop_cbs, cbr);
251 mutex_exit(&dd->dd_lock);
252
253 cbr->cbr_func(cbr->cbr_arg, value);
254 return (0);
255 }
256
257 int
dsl_prop_get(const char * dsname,const char * propname,int intsz,int numints,void * buf,char * setpoint)258 dsl_prop_get(const char *dsname, const char *propname,
259 int intsz, int numints, void *buf, char *setpoint)
260 {
261 objset_t *os;
262 int error;
263
264 error = dmu_objset_hold(dsname, FTAG, &os);
265 if (error != 0)
266 return (error);
267
268 error = dsl_prop_get_ds(dmu_objset_ds(os), propname,
269 intsz, numints, buf, setpoint);
270
271 dmu_objset_rele(os, FTAG);
272 return (error);
273 }
274
275 /*
276 * Get the current property value. It may have changed by the time this
277 * function returns, so it is NOT safe to follow up with
278 * dsl_prop_register() and assume that the value has not changed in
279 * between.
280 *
281 * Return 0 on success, ENOENT if ddname is invalid.
282 */
283 int
dsl_prop_get_integer(const char * ddname,const char * propname,uint64_t * valuep,char * setpoint)284 dsl_prop_get_integer(const char *ddname, const char *propname,
285 uint64_t *valuep, char *setpoint)
286 {
287 return (dsl_prop_get(ddname, propname, 8, 1, valuep, setpoint));
288 }
289
290 int
dsl_prop_get_int_ds(dsl_dataset_t * ds,const char * propname,uint64_t * valuep)291 dsl_prop_get_int_ds(dsl_dataset_t *ds, const char *propname,
292 uint64_t *valuep)
293 {
294 return (dsl_prop_get_ds(ds, propname, 8, 1, valuep, NULL));
295 }
296
297 /*
298 * Predict the effective value of the given special property if it were set with
299 * the given value and source. This is not a general purpose function. It exists
300 * only to handle the special requirements of the quota and reservation
301 * properties. The fact that these properties are non-inheritable greatly
302 * simplifies the prediction logic.
303 *
304 * Returns 0 on success, a positive error code on failure, or -1 if called with
305 * a property not handled by this function.
306 */
307 int
dsl_prop_predict(dsl_dir_t * dd,const char * propname,zprop_source_t source,uint64_t value,uint64_t * newvalp)308 dsl_prop_predict(dsl_dir_t *dd, const char *propname,
309 zprop_source_t source, uint64_t value, uint64_t *newvalp)
310 {
311 zfs_prop_t prop = zfs_name_to_prop(propname);
312 objset_t *mos;
313 uint64_t zapobj;
314 uint64_t version;
315 char *recvdstr;
316 int err = 0;
317
318 switch (prop) {
319 case ZFS_PROP_QUOTA:
320 case ZFS_PROP_RESERVATION:
321 case ZFS_PROP_REFQUOTA:
322 case ZFS_PROP_REFRESERVATION:
323 break;
324 default:
325 return (-1);
326 }
327
328 mos = dd->dd_pool->dp_meta_objset;
329 zapobj = dsl_dir_phys(dd)->dd_props_zapobj;
330 recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
331
332 version = spa_version(dd->dd_pool->dp_spa);
333 if (version < SPA_VERSION_RECVD_PROPS) {
334 if (source & ZPROP_SRC_NONE)
335 source = ZPROP_SRC_NONE;
336 else if (source & ZPROP_SRC_RECEIVED)
337 source = ZPROP_SRC_LOCAL;
338 }
339
340 switch (source) {
341 case ZPROP_SRC_NONE:
342 /* Revert to the received value, if any. */
343 err = zap_lookup(mos, zapobj, recvdstr, 8, 1, newvalp);
344 if (err == ENOENT)
345 *newvalp = 0;
346 break;
347 case ZPROP_SRC_LOCAL:
348 *newvalp = value;
349 break;
350 case ZPROP_SRC_RECEIVED:
351 /*
352 * If there's no local setting, then the new received value will
353 * be the effective value.
354 */
355 err = zap_lookup(mos, zapobj, propname, 8, 1, newvalp);
356 if (err == ENOENT)
357 *newvalp = value;
358 break;
359 case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
360 /*
361 * We're clearing the received value, so the local setting (if
362 * it exists) remains the effective value.
363 */
364 err = zap_lookup(mos, zapobj, propname, 8, 1, newvalp);
365 if (err == ENOENT)
366 *newvalp = 0;
367 break;
368 default:
369 panic("unexpected property source: %d", source);
370 }
371
372 strfree(recvdstr);
373
374 if (err == ENOENT)
375 return (0);
376
377 return (err);
378 }
379
380 /*
381 * Unregister this callback. Return 0 on success, ENOENT if ddname is
382 * invalid, or ENOMSG if no matching callback registered.
383 */
384 int
dsl_prop_unregister(dsl_dataset_t * ds,const char * propname,dsl_prop_changed_cb_t * callback,void * cbarg)385 dsl_prop_unregister(dsl_dataset_t *ds, const char *propname,
386 dsl_prop_changed_cb_t *callback, void *cbarg)
387 {
388 dsl_dir_t *dd = ds->ds_dir;
389 dsl_prop_cb_record_t *cbr;
390
391 mutex_enter(&dd->dd_lock);
392 for (cbr = list_head(&dd->dd_prop_cbs);
393 cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) {
394 if (cbr->cbr_ds == ds &&
395 cbr->cbr_func == callback &&
396 cbr->cbr_arg == cbarg &&
397 strcmp(cbr->cbr_propname, propname) == 0)
398 break;
399 }
400
401 if (cbr == NULL) {
402 mutex_exit(&dd->dd_lock);
403 return (SET_ERROR(ENOMSG));
404 }
405
406 list_remove(&dd->dd_prop_cbs, cbr);
407 mutex_exit(&dd->dd_lock);
408 kmem_free((void*)cbr->cbr_propname, strlen(cbr->cbr_propname)+1);
409 kmem_free(cbr, sizeof (dsl_prop_cb_record_t));
410
411 return (0);
412 }
413
414 boolean_t
dsl_prop_hascb(dsl_dataset_t * ds)415 dsl_prop_hascb(dsl_dataset_t *ds)
416 {
417 dsl_dir_t *dd = ds->ds_dir;
418 boolean_t rv = B_FALSE;
419 dsl_prop_cb_record_t *cbr;
420
421 mutex_enter(&dd->dd_lock);
422 for (cbr = list_head(&dd->dd_prop_cbs); cbr;
423 cbr = list_next(&dd->dd_prop_cbs, cbr)) {
424 if (cbr->cbr_ds == ds) {
425 rv = B_TRUE;
426 break;
427 }
428 }
429 mutex_exit(&dd->dd_lock);
430 return (rv);
431 }
432
433 /* ARGSUSED */
434 static int
dsl_prop_notify_all_cb(dsl_pool_t * dp,dsl_dataset_t * ds,void * arg)435 dsl_prop_notify_all_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg)
436 {
437 dsl_dir_t *dd = ds->ds_dir;
438 dsl_prop_cb_record_t *cbr;
439
440 mutex_enter(&dd->dd_lock);
441 for (cbr = list_head(&dd->dd_prop_cbs); cbr;
442 cbr = list_next(&dd->dd_prop_cbs, cbr)) {
443 uint64_t value;
444
445 if (dsl_prop_get_ds(cbr->cbr_ds, cbr->cbr_propname,
446 sizeof (value), 1, &value, NULL) == 0)
447 cbr->cbr_func(cbr->cbr_arg, value);
448 }
449 mutex_exit(&dd->dd_lock);
450
451 return (0);
452 }
453
454 /*
455 * Update all property values for ddobj & its descendants. This is used
456 * when renaming the dir.
457 */
458 void
dsl_prop_notify_all(dsl_dir_t * dd)459 dsl_prop_notify_all(dsl_dir_t *dd)
460 {
461 dsl_pool_t *dp = dd->dd_pool;
462 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
463 (void) dmu_objset_find_dp(dp, dd->dd_object, dsl_prop_notify_all_cb,
464 NULL, DS_FIND_CHILDREN);
465 }
466
467 static void
dsl_prop_changed_notify(dsl_pool_t * dp,uint64_t ddobj,const char * propname,uint64_t value,int first)468 dsl_prop_changed_notify(dsl_pool_t *dp, uint64_t ddobj,
469 const char *propname, uint64_t value, int first)
470 {
471 dsl_dir_t *dd;
472 dsl_prop_cb_record_t *cbr;
473 objset_t *mos = dp->dp_meta_objset;
474 zap_cursor_t zc;
475 zap_attribute_t *za;
476 int err;
477
478 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
479 err = dsl_dir_hold_obj(dp, ddobj, NULL, FTAG, &dd);
480 if (err)
481 return;
482
483 if (!first) {
484 /*
485 * If the prop is set here, then this change is not
486 * being inherited here or below; stop the recursion.
487 */
488 err = zap_contains(mos, dsl_dir_phys(dd)->dd_props_zapobj,
489 propname);
490 if (err == 0) {
491 dsl_dir_rele(dd, FTAG);
492 return;
493 }
494 ASSERT3U(err, ==, ENOENT);
495 }
496
497 mutex_enter(&dd->dd_lock);
498 for (cbr = list_head(&dd->dd_prop_cbs); cbr;
499 cbr = list_next(&dd->dd_prop_cbs, cbr)) {
500 uint64_t propobj = dsl_dataset_phys(cbr->cbr_ds)->ds_props_obj;
501
502 if (strcmp(cbr->cbr_propname, propname) != 0)
503 continue;
504
505 /*
506 * If the property is set on this ds, then it is not
507 * inherited here; don't call the callback.
508 */
509 if (propobj && 0 == zap_contains(mos, propobj, propname))
510 continue;
511
512 cbr->cbr_func(cbr->cbr_arg, value);
513 }
514 mutex_exit(&dd->dd_lock);
515
516 za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
517 for (zap_cursor_init(&zc, mos,
518 dsl_dir_phys(dd)->dd_child_dir_zapobj);
519 zap_cursor_retrieve(&zc, za) == 0;
520 zap_cursor_advance(&zc)) {
521 dsl_prop_changed_notify(dp, za->za_first_integer,
522 propname, value, FALSE);
523 }
524 kmem_free(za, sizeof (zap_attribute_t));
525 zap_cursor_fini(&zc);
526 dsl_dir_rele(dd, FTAG);
527 }
528
529 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)530 dsl_prop_set_sync_impl(dsl_dataset_t *ds, const char *propname,
531 zprop_source_t source, int intsz, int numints, const void *value,
532 dmu_tx_t *tx)
533 {
534 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
535 uint64_t zapobj, intval, dummy;
536 int isint;
537 char valbuf[32];
538 const char *valstr = NULL;
539 char *inheritstr;
540 char *recvdstr;
541 char *tbuf = NULL;
542 int err;
543 uint64_t version = spa_version(ds->ds_dir->dd_pool->dp_spa);
544
545 isint = (dodefault(propname, 8, 1, &intval) == 0);
546
547 if (dsl_dataset_is_snapshot(ds)) {
548 ASSERT(version >= SPA_VERSION_SNAP_PROPS);
549 if (dsl_dataset_phys(ds)->ds_props_obj == 0) {
550 dmu_buf_will_dirty(ds->ds_dbuf, tx);
551 dsl_dataset_phys(ds)->ds_props_obj =
552 zap_create(mos,
553 DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
554 }
555 zapobj = dsl_dataset_phys(ds)->ds_props_obj;
556 } else {
557 zapobj = dsl_dir_phys(ds->ds_dir)->dd_props_zapobj;
558 }
559
560 if (version < SPA_VERSION_RECVD_PROPS) {
561 if (source & ZPROP_SRC_NONE)
562 source = ZPROP_SRC_NONE;
563 else if (source & ZPROP_SRC_RECEIVED)
564 source = ZPROP_SRC_LOCAL;
565 }
566
567 inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
568 recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
569
570 switch (source) {
571 case ZPROP_SRC_NONE:
572 /*
573 * revert to received value, if any (inherit -S)
574 * - remove propname
575 * - remove propname$inherit
576 */
577 err = zap_remove(mos, zapobj, propname, tx);
578 ASSERT(err == 0 || err == ENOENT);
579 err = zap_remove(mos, zapobj, inheritstr, tx);
580 ASSERT(err == 0 || err == ENOENT);
581 break;
582 case ZPROP_SRC_LOCAL:
583 /*
584 * remove propname$inherit
585 * set propname -> value
586 */
587 err = zap_remove(mos, zapobj, inheritstr, tx);
588 ASSERT(err == 0 || err == ENOENT);
589 VERIFY0(zap_update(mos, zapobj, propname,
590 intsz, numints, value, tx));
591 break;
592 case ZPROP_SRC_INHERITED:
593 /*
594 * explicitly inherit
595 * - remove propname
596 * - set propname$inherit
597 */
598 err = zap_remove(mos, zapobj, propname, tx);
599 ASSERT(err == 0 || err == ENOENT);
600 if (version >= SPA_VERSION_RECVD_PROPS &&
601 dsl_prop_get_int_ds(ds, ZPROP_HAS_RECVD, &dummy) == 0) {
602 dummy = 0;
603 VERIFY0(zap_update(mos, zapobj, inheritstr,
604 8, 1, &dummy, tx));
605 }
606 break;
607 case ZPROP_SRC_RECEIVED:
608 /*
609 * set propname$recvd -> value
610 */
611 err = zap_update(mos, zapobj, recvdstr,
612 intsz, numints, value, tx);
613 ASSERT(err == 0);
614 break;
615 case (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED):
616 /*
617 * clear local and received settings
618 * - remove propname
619 * - remove propname$inherit
620 * - remove propname$recvd
621 */
622 err = zap_remove(mos, zapobj, propname, tx);
623 ASSERT(err == 0 || err == ENOENT);
624 err = zap_remove(mos, zapobj, inheritstr, tx);
625 ASSERT(err == 0 || err == ENOENT);
626 /* FALLTHRU */
627 case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
628 /*
629 * remove propname$recvd
630 */
631 err = zap_remove(mos, zapobj, recvdstr, tx);
632 ASSERT(err == 0 || err == ENOENT);
633 break;
634 default:
635 cmn_err(CE_PANIC, "unexpected property source: %d", source);
636 }
637
638 strfree(inheritstr);
639 strfree(recvdstr);
640
641 if (isint) {
642 VERIFY0(dsl_prop_get_int_ds(ds, propname, &intval));
643
644 if (dsl_dataset_is_snapshot(ds)) {
645 dsl_prop_cb_record_t *cbr;
646 /*
647 * It's a snapshot; nothing can inherit this
648 * property, so just look for callbacks on this
649 * ds here.
650 */
651 mutex_enter(&ds->ds_dir->dd_lock);
652 for (cbr = list_head(&ds->ds_dir->dd_prop_cbs); cbr;
653 cbr = list_next(&ds->ds_dir->dd_prop_cbs, cbr)) {
654 if (cbr->cbr_ds == ds &&
655 strcmp(cbr->cbr_propname, propname) == 0)
656 cbr->cbr_func(cbr->cbr_arg, intval);
657 }
658 mutex_exit(&ds->ds_dir->dd_lock);
659 } else {
660 dsl_prop_changed_notify(ds->ds_dir->dd_pool,
661 ds->ds_dir->dd_object, propname, intval, TRUE);
662 }
663
664 (void) snprintf(valbuf, sizeof (valbuf),
665 "%lld", (longlong_t)intval);
666 valstr = valbuf;
667 } else {
668 if (source == ZPROP_SRC_LOCAL) {
669 valstr = value;
670 } else {
671 tbuf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
672 if (dsl_prop_get_ds(ds, propname, 1,
673 ZAP_MAXVALUELEN, tbuf, NULL) == 0)
674 valstr = tbuf;
675 }
676 }
677
678 spa_history_log_internal_ds(ds, (source == ZPROP_SRC_NONE ||
679 source == ZPROP_SRC_INHERITED) ? "inherit" : "set", tx,
680 "%s=%s", propname, (valstr == NULL ? "" : valstr));
681
682 if (tbuf != NULL)
683 kmem_free(tbuf, ZAP_MAXVALUELEN);
684 }
685
686 int
dsl_prop_set_int(const char * dsname,const char * propname,zprop_source_t source,uint64_t value)687 dsl_prop_set_int(const char *dsname, const char *propname,
688 zprop_source_t source, uint64_t value)
689 {
690 nvlist_t *nvl = fnvlist_alloc();
691 int error;
692
693 fnvlist_add_uint64(nvl, propname, value);
694 error = dsl_props_set(dsname, source, nvl);
695 fnvlist_free(nvl);
696 return (error);
697 }
698
699 int
dsl_prop_set_string(const char * dsname,const char * propname,zprop_source_t source,const char * value)700 dsl_prop_set_string(const char *dsname, const char *propname,
701 zprop_source_t source, const char *value)
702 {
703 nvlist_t *nvl = fnvlist_alloc();
704 int error;
705
706 fnvlist_add_string(nvl, propname, value);
707 error = dsl_props_set(dsname, source, nvl);
708 fnvlist_free(nvl);
709 return (error);
710 }
711
712 int
dsl_prop_inherit(const char * dsname,const char * propname,zprop_source_t source)713 dsl_prop_inherit(const char *dsname, const char *propname,
714 zprop_source_t source)
715 {
716 nvlist_t *nvl = fnvlist_alloc();
717 int error;
718
719 fnvlist_add_boolean(nvl, propname);
720 error = dsl_props_set(dsname, source, nvl);
721 fnvlist_free(nvl);
722 return (error);
723 }
724
725 typedef struct dsl_props_set_arg {
726 const char *dpsa_dsname;
727 zprop_source_t dpsa_source;
728 nvlist_t *dpsa_props;
729 } dsl_props_set_arg_t;
730
731 static int
dsl_props_set_check(void * arg,dmu_tx_t * tx)732 dsl_props_set_check(void *arg, dmu_tx_t *tx)
733 {
734 dsl_props_set_arg_t *dpsa = arg;
735 dsl_pool_t *dp = dmu_tx_pool(tx);
736 dsl_dataset_t *ds;
737 uint64_t version;
738 nvpair_t *elem = NULL;
739 int err;
740
741 err = dsl_dataset_hold(dp, dpsa->dpsa_dsname, FTAG, &ds);
742 if (err != 0)
743 return (err);
744
745 version = spa_version(ds->ds_dir->dd_pool->dp_spa);
746 while ((elem = nvlist_next_nvpair(dpsa->dpsa_props, elem)) != NULL) {
747 if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
748 dsl_dataset_rele(ds, FTAG);
749 return (SET_ERROR(ENAMETOOLONG));
750 }
751 if (nvpair_type(elem) == DATA_TYPE_STRING) {
752 char *valstr = fnvpair_value_string(elem);
753 if (strlen(valstr) >= (version <
754 SPA_VERSION_STMF_PROP ?
755 ZAP_OLDMAXVALUELEN : ZAP_MAXVALUELEN)) {
756 dsl_dataset_rele(ds, FTAG);
757 return (E2BIG);
758 }
759 }
760 }
761
762 if (dsl_dataset_is_snapshot(ds) && version < SPA_VERSION_SNAP_PROPS) {
763 dsl_dataset_rele(ds, FTAG);
764 return (SET_ERROR(ENOTSUP));
765 }
766 dsl_dataset_rele(ds, FTAG);
767 return (0);
768 }
769
770 void
dsl_props_set_sync_impl(dsl_dataset_t * ds,zprop_source_t source,nvlist_t * props,dmu_tx_t * tx)771 dsl_props_set_sync_impl(dsl_dataset_t *ds, zprop_source_t source,
772 nvlist_t *props, dmu_tx_t *tx)
773 {
774 nvpair_t *elem = NULL;
775
776 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
777 nvpair_t *pair = elem;
778
779 if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
780 /*
781 * dsl_prop_get_all_impl() returns properties in this
782 * format.
783 */
784 nvlist_t *attrs = fnvpair_value_nvlist(pair);
785 pair = fnvlist_lookup_nvpair(attrs, ZPROP_VALUE);
786 }
787
788 if (nvpair_type(pair) == DATA_TYPE_STRING) {
789 const char *value = fnvpair_value_string(pair);
790 dsl_prop_set_sync_impl(ds, nvpair_name(pair),
791 source, 1, strlen(value) + 1, value, tx);
792 } else if (nvpair_type(pair) == DATA_TYPE_UINT64) {
793 uint64_t intval = fnvpair_value_uint64(pair);
794 dsl_prop_set_sync_impl(ds, nvpair_name(pair),
795 source, sizeof (intval), 1, &intval, tx);
796 } else if (nvpair_type(pair) == DATA_TYPE_BOOLEAN) {
797 dsl_prop_set_sync_impl(ds, nvpair_name(pair),
798 source, 0, 0, NULL, tx);
799 } else {
800 panic("invalid nvpair type");
801 }
802 }
803 }
804
805 static void
dsl_props_set_sync(void * arg,dmu_tx_t * tx)806 dsl_props_set_sync(void *arg, dmu_tx_t *tx)
807 {
808 dsl_props_set_arg_t *dpsa = arg;
809 dsl_pool_t *dp = dmu_tx_pool(tx);
810 dsl_dataset_t *ds;
811
812 VERIFY0(dsl_dataset_hold(dp, dpsa->dpsa_dsname, FTAG, &ds));
813 dsl_props_set_sync_impl(ds, dpsa->dpsa_source, dpsa->dpsa_props, tx);
814 dsl_dataset_rele(ds, FTAG);
815 }
816
817 /*
818 * All-or-nothing; if any prop can't be set, nothing will be modified.
819 */
820 int
dsl_props_set(const char * dsname,zprop_source_t source,nvlist_t * props)821 dsl_props_set(const char *dsname, zprop_source_t source, nvlist_t *props)
822 {
823 dsl_props_set_arg_t dpsa;
824 int nblks = 0;
825
826 dpsa.dpsa_dsname = dsname;
827 dpsa.dpsa_source = source;
828 dpsa.dpsa_props = props;
829
830 /*
831 * If the source includes NONE, then we will only be removing entries
832 * from the ZAP object. In that case don't check for ENOSPC.
833 */
834 if ((source & ZPROP_SRC_NONE) == 0)
835 nblks = 2 * fnvlist_num_pairs(props);
836
837 return (dsl_sync_task(dsname, dsl_props_set_check, dsl_props_set_sync,
838 &dpsa, nblks, ZFS_SPACE_CHECK_RESERVED));
839 }
840
841 typedef enum dsl_prop_getflags {
842 DSL_PROP_GET_INHERITING = 0x1, /* searching parent of target ds */
843 DSL_PROP_GET_SNAPSHOT = 0x2, /* snapshot dataset */
844 DSL_PROP_GET_LOCAL = 0x4, /* local properties */
845 DSL_PROP_GET_RECEIVED = 0x8 /* received properties */
846 } dsl_prop_getflags_t;
847
848 static int
dsl_prop_get_all_impl(objset_t * mos,uint64_t propobj,const char * setpoint,dsl_prop_getflags_t flags,nvlist_t * nv)849 dsl_prop_get_all_impl(objset_t *mos, uint64_t propobj,
850 const char *setpoint, dsl_prop_getflags_t flags, nvlist_t *nv)
851 {
852 zap_cursor_t zc;
853 zap_attribute_t za;
854 int err = 0;
855
856 for (zap_cursor_init(&zc, mos, propobj);
857 (err = zap_cursor_retrieve(&zc, &za)) == 0;
858 zap_cursor_advance(&zc)) {
859 nvlist_t *propval;
860 zfs_prop_t prop;
861 char buf[ZAP_MAXNAMELEN];
862 char *valstr;
863 const char *suffix;
864 const char *propname;
865 const char *source;
866
867 suffix = strchr(za.za_name, '$');
868
869 if (suffix == NULL) {
870 /*
871 * Skip local properties if we only want received
872 * properties.
873 */
874 if (flags & DSL_PROP_GET_RECEIVED)
875 continue;
876
877 propname = za.za_name;
878 source = setpoint;
879 } else if (strcmp(suffix, ZPROP_INHERIT_SUFFIX) == 0) {
880 /* Skip explicitly inherited entries. */
881 continue;
882 } else if (strcmp(suffix, ZPROP_RECVD_SUFFIX) == 0) {
883 if (flags & DSL_PROP_GET_LOCAL)
884 continue;
885
886 (void) strncpy(buf, za.za_name, (suffix - za.za_name));
887 buf[suffix - za.za_name] = '\0';
888 propname = buf;
889
890 if (!(flags & DSL_PROP_GET_RECEIVED)) {
891 /* Skip if locally overridden. */
892 err = zap_contains(mos, propobj, propname);
893 if (err == 0)
894 continue;
895 if (err != ENOENT)
896 break;
897
898 /* Skip if explicitly inherited. */
899 valstr = kmem_asprintf("%s%s", propname,
900 ZPROP_INHERIT_SUFFIX);
901 err = zap_contains(mos, propobj, valstr);
902 strfree(valstr);
903 if (err == 0)
904 continue;
905 if (err != ENOENT)
906 break;
907 }
908
909 source = ((flags & DSL_PROP_GET_INHERITING) ?
910 setpoint : ZPROP_SOURCE_VAL_RECVD);
911 } else {
912 /*
913 * For backward compatibility, skip suffixes we don't
914 * recognize.
915 */
916 continue;
917 }
918
919 prop = zfs_name_to_prop(propname);
920
921 /* Skip non-inheritable properties. */
922 if ((flags & DSL_PROP_GET_INHERITING) && prop != ZPROP_INVAL &&
923 !zfs_prop_inheritable(prop))
924 continue;
925
926 /* Skip properties not valid for this type. */
927 if ((flags & DSL_PROP_GET_SNAPSHOT) && prop != ZPROP_INVAL &&
928 !zfs_prop_valid_for_type(prop, ZFS_TYPE_SNAPSHOT))
929 continue;
930
931 /* Skip properties already defined. */
932 if (nvlist_exists(nv, propname))
933 continue;
934
935 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
936 if (za.za_integer_length == 1) {
937 /*
938 * String property
939 */
940 char *tmp = kmem_alloc(za.za_num_integers,
941 KM_SLEEP);
942 err = zap_lookup(mos, propobj,
943 za.za_name, 1, za.za_num_integers, tmp);
944 if (err != 0) {
945 kmem_free(tmp, za.za_num_integers);
946 break;
947 }
948 VERIFY(nvlist_add_string(propval, ZPROP_VALUE,
949 tmp) == 0);
950 kmem_free(tmp, za.za_num_integers);
951 } else {
952 /*
953 * Integer property
954 */
955 ASSERT(za.za_integer_length == 8);
956 (void) nvlist_add_uint64(propval, ZPROP_VALUE,
957 za.za_first_integer);
958 }
959
960 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, source) == 0);
961 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
962 nvlist_free(propval);
963 }
964 zap_cursor_fini(&zc);
965 if (err == ENOENT)
966 err = 0;
967 return (err);
968 }
969
970 /*
971 * Iterate over all properties for this dataset and return them in an nvlist.
972 */
973 static int
dsl_prop_get_all_ds(dsl_dataset_t * ds,nvlist_t ** nvp,dsl_prop_getflags_t flags)974 dsl_prop_get_all_ds(dsl_dataset_t *ds, nvlist_t **nvp,
975 dsl_prop_getflags_t flags)
976 {
977 dsl_dir_t *dd = ds->ds_dir;
978 dsl_pool_t *dp = dd->dd_pool;
979 objset_t *mos = dp->dp_meta_objset;
980 int err = 0;
981 char setpoint[MAXNAMELEN];
982
983 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
984
985 if (dsl_dataset_is_snapshot(ds))
986 flags |= DSL_PROP_GET_SNAPSHOT;
987
988 ASSERT(dsl_pool_config_held(dp));
989
990 if (dsl_dataset_phys(ds)->ds_props_obj != 0) {
991 ASSERT(flags & DSL_PROP_GET_SNAPSHOT);
992 dsl_dataset_name(ds, setpoint);
993 err = dsl_prop_get_all_impl(mos,
994 dsl_dataset_phys(ds)->ds_props_obj, setpoint, flags, *nvp);
995 if (err)
996 goto out;
997 }
998
999 for (; dd != NULL; dd = dd->dd_parent) {
1000 if (dd != ds->ds_dir || (flags & DSL_PROP_GET_SNAPSHOT)) {
1001 if (flags & (DSL_PROP_GET_LOCAL |
1002 DSL_PROP_GET_RECEIVED))
1003 break;
1004 flags |= DSL_PROP_GET_INHERITING;
1005 }
1006 dsl_dir_name(dd, setpoint);
1007 err = dsl_prop_get_all_impl(mos,
1008 dsl_dir_phys(dd)->dd_props_zapobj, setpoint, flags, *nvp);
1009 if (err)
1010 break;
1011 }
1012 out:
1013 return (err);
1014 }
1015
1016 boolean_t
dsl_prop_get_hasrecvd(const char * dsname)1017 dsl_prop_get_hasrecvd(const char *dsname)
1018 {
1019 uint64_t dummy;
1020
1021 return (0 ==
1022 dsl_prop_get_integer(dsname, ZPROP_HAS_RECVD, &dummy, NULL));
1023 }
1024
1025 static int
dsl_prop_set_hasrecvd_impl(const char * dsname,zprop_source_t source)1026 dsl_prop_set_hasrecvd_impl(const char *dsname, zprop_source_t source)
1027 {
1028 uint64_t version;
1029 spa_t *spa;
1030 int error = 0;
1031
1032 VERIFY0(spa_open(dsname, &spa, FTAG));
1033 version = spa_version(spa);
1034 spa_close(spa, FTAG);
1035
1036 if (version >= SPA_VERSION_RECVD_PROPS)
1037 error = dsl_prop_set_int(dsname, ZPROP_HAS_RECVD, source, 0);
1038 return (error);
1039 }
1040
1041 /*
1042 * Call after successfully receiving properties to ensure that only the first
1043 * receive on or after SPA_VERSION_RECVD_PROPS blows away local properties.
1044 */
1045 int
dsl_prop_set_hasrecvd(const char * dsname)1046 dsl_prop_set_hasrecvd(const char *dsname)
1047 {
1048 int error = 0;
1049 if (!dsl_prop_get_hasrecvd(dsname))
1050 error = dsl_prop_set_hasrecvd_impl(dsname, ZPROP_SRC_LOCAL);
1051 return (error);
1052 }
1053
1054 void
dsl_prop_unset_hasrecvd(const char * dsname)1055 dsl_prop_unset_hasrecvd(const char *dsname)
1056 {
1057 VERIFY0(dsl_prop_set_hasrecvd_impl(dsname, ZPROP_SRC_NONE));
1058 }
1059
1060 int
dsl_prop_get_all(objset_t * os,nvlist_t ** nvp)1061 dsl_prop_get_all(objset_t *os, nvlist_t **nvp)
1062 {
1063 return (dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, 0));
1064 }
1065
1066 int
dsl_prop_get_received(const char * dsname,nvlist_t ** nvp)1067 dsl_prop_get_received(const char *dsname, nvlist_t **nvp)
1068 {
1069 objset_t *os;
1070 int error;
1071
1072 /*
1073 * Received properties are not distinguishable from local properties
1074 * until the dataset has received properties on or after
1075 * SPA_VERSION_RECVD_PROPS.
1076 */
1077 dsl_prop_getflags_t flags = (dsl_prop_get_hasrecvd(dsname) ?
1078 DSL_PROP_GET_RECEIVED : DSL_PROP_GET_LOCAL);
1079
1080 error = dmu_objset_hold(dsname, FTAG, &os);
1081 if (error != 0)
1082 return (error);
1083 error = dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, flags);
1084 dmu_objset_rele(os, FTAG);
1085 return (error);
1086 }
1087
1088 void
dsl_prop_nvlist_add_uint64(nvlist_t * nv,zfs_prop_t prop,uint64_t value)1089 dsl_prop_nvlist_add_uint64(nvlist_t *nv, zfs_prop_t prop, uint64_t value)
1090 {
1091 nvlist_t *propval;
1092 const char *propname = zfs_prop_to_name(prop);
1093 uint64_t default_value;
1094
1095 if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1096 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1097 return;
1098 }
1099
1100 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1101 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1102 /* Indicate the default source if we can. */
1103 if (dodefault(propname, 8, 1, &default_value) == 0 &&
1104 value == default_value) {
1105 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, "") == 0);
1106 }
1107 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1108 nvlist_free(propval);
1109 }
1110
1111 void
dsl_prop_nvlist_add_string(nvlist_t * nv,zfs_prop_t prop,const char * value)1112 dsl_prop_nvlist_add_string(nvlist_t *nv, zfs_prop_t prop, const char *value)
1113 {
1114 nvlist_t *propval;
1115 const char *propname = zfs_prop_to_name(prop);
1116
1117 if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1118 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1119 return;
1120 }
1121
1122 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1123 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1124 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1125 nvlist_free(propval);
1126 }
1127