sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_prop.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #include <sys/zfs_context.h>
  26 #include <sys/dmu.h>
  27 #include <sys/dmu_objset.h>
  28 #include <sys/dmu_tx.h>
  29 #include <sys/dsl_dataset.h>
  30 #include <sys/dsl_dir.h>
  31 #include <sys/dsl_prop.h>
  32 #include <sys/dsl_synctask.h>
  33 #include <sys/spa.h>
  34 #include <sys/zap.h>
  35 #include <sys/fs/zfs.h>
  36
  37 #include "zfs_prop.h"
  38
  39 #define ZPROP_INHERIT_SUFFIX "$inherit"
  40 #define ZPROP_RECVD_SUFFIX "$recvd"
  41
  42 static int
  43 dodefault(const char *propname, int intsz, int numints, void *buf)
  44 {
  45         zfs_prop_t prop;
  46
  47         /*
  48          * The setonce properties are read-only, BUT they still
  49          * have a default value that can be used as the initial
  50          * value.
  51          */
  52         if ((prop = zfs_name_to_prop(propname)) == ZPROP_INVAL ||
  53             (zfs_prop_readonly(prop) && !zfs_prop_setonce(prop)))
  54                 return (ENOENT);
  55
  56         if (zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
  57                 if (intsz != 1)
  58                         return (EOVERFLOW);
  59                 (void) strncpy(buf, zfs_prop_default_string(prop),
  60                     numints);
  61         } else {
  62                 if (intsz != 8 || numints < 1)
  63                         return (EOVERFLOW);
  64
  65                 *(uint64_t *)buf = zfs_prop_default_numeric(prop);
  66         }
  67
  68         return (0);
  69 }
  70
  71 int
  72 dsl_prop_get_dd(dsl_dir_t *dd, const char *propname,
  73     int intsz, int numints, void *buf, char *setpoint, boolean_t snapshot)
  74 {
  75         int err = ENOENT;
  76         dsl_dir_t *target = dd;
  77         objset_t *mos = dd->dd_pool->dp_meta_objset;
  78         zfs_prop_t prop;
  79         boolean_t inheritable;
  80         boolean_t inheriting = B_FALSE;
  81         char *inheritstr;
  82         char *recvdstr;
  83
  84         ASSERT(RW_LOCK_HELD(&dd->dd_pool->dp_config_rwlock));
  85
  86         if (setpoint)
  87                 setpoint[0] = '\0';
  88
  89         prop = zfs_name_to_prop(propname);
  90         inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
  91         inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
  92         recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
  93
  94         /*
  95          * Note: dd may become NULL, therefore we shouldn't dereference it
  96          * after this loop.
  97          */
  98         for (; dd != NULL; dd = dd->dd_parent) {
  99                 ASSERT(RW_LOCK_HELD(&dd->dd_pool->dp_config_rwlock));
 100
 101                 if (dd != target || snapshot) {
 102                         if (!inheritable)
 103                                 break;
 104                         inheriting = B_TRUE;
 105                 }
 106
 107                 /* Check for a local value. */
 108                 err = zap_lookup(mos, dd->dd_phys->dd_props_zapobj, propname,
 109                     intsz, numints, buf);
 110                 if (err != ENOENT) {
 111                         if (setpoint != NULL && err == 0)
 112                                 dsl_dir_name(dd, setpoint);
 113                         break;
 114                 }
 115
 116                 /*
 117                  * Skip the check for a received value if there is an explicit
 118                  * inheritance entry.
 119                  */
 120                 err = zap_contains(mos, dd->dd_phys->dd_props_zapobj,
 121                     inheritstr);
 122                 if (err != 0 && err != ENOENT)
 123                         break;
 124
 125                 if (err == ENOENT) {
 126                         /* Check for a received value. */
 127                         err = zap_lookup(mos, dd->dd_phys->dd_props_zapobj,
 128                             recvdstr, intsz, numints, buf);
 129                         if (err != ENOENT) {
 130                                 if (setpoint != NULL && err == 0) {
 131                                         if (inheriting) {
 132                                                 dsl_dir_name(dd, setpoint);
 133                                         } else {
 134                                                 (void) strcpy(setpoint,
 135                                                     ZPROP_SOURCE_VAL_RECVD);
 136                                         }
 137                                 }
 138                                 break;
 139                         }
 140                 }
 141
 142                 /*
 143                  * If we found an explicit inheritance entry, err is zero even
 144                  * though we haven't yet found the value, so reinitializing err
 145                  * at the end of the loop (instead of at the beginning) ensures
 146                  * that err has a valid post-loop value.
 147                  */
 148                 err = ENOENT;
 149         }
 150
 151         if (err == ENOENT)
 152                 err = dodefault(propname, intsz, numints, buf);
 153
 154         strfree(inheritstr);
 155         strfree(recvdstr);
 156
 157         return (err);
 158 }
 159
 160 int
 161 dsl_prop_get_ds(dsl_dataset_t *ds, const char *propname,
 162     int intsz, int numints, void *buf, char *setpoint)
 163 {
 164         zfs_prop_t prop = zfs_name_to_prop(propname);
 165         boolean_t inheritable;
 166         boolean_t snapshot;
 167         uint64_t zapobj;
 168
 169         ASSERT(RW_LOCK_HELD(&ds->ds_dir->dd_pool->dp_config_rwlock));
 170         inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
 171         snapshot = (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds));
 172         zapobj = (ds->ds_phys == NULL ? 0 : ds->ds_phys->ds_props_obj);
 173
 174         if (zapobj != 0) {
 175                 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
 176                 int err;
 177
 178                 ASSERT(snapshot);
 179
 180                 /* Check for a local value. */
 181                 err = zap_lookup(mos, zapobj, propname, intsz, numints, buf);
 182                 if (err != ENOENT) {
 183                         if (setpoint != NULL && err == 0)
 184                                 dsl_dataset_name(ds, setpoint);
 185                         return (err);
 186                 }
 187
 188                 /*
 189                  * Skip the check for a received value if there is an explicit
 190                  * inheritance entry.
 191                  */
 192                 if (inheritable) {
 193                         char *inheritstr = kmem_asprintf("%s%s", propname,
 194                             ZPROP_INHERIT_SUFFIX);
 195                         err = zap_contains(mos, zapobj, inheritstr);
 196                         strfree(inheritstr);
 197                         if (err != 0 && err != ENOENT)
 198                                 return (err);
 199                 }
 200
 201                 if (err == ENOENT) {
 202                         /* Check for a received value. */
 203                         char *recvdstr = kmem_asprintf("%s%s", propname,
 204                             ZPROP_RECVD_SUFFIX);
 205                         err = zap_lookup(mos, zapobj, recvdstr,
 206                             intsz, numints, buf);
 207                         strfree(recvdstr);
 208                         if (err != ENOENT) {
 209                                 if (setpoint != NULL && err == 0)
 210                                         (void) strcpy(setpoint,
 211                                             ZPROP_SOURCE_VAL_RECVD);
 212                                 return (err);
 213                         }
 214                 }
 215         }
 216
 217         return (dsl_prop_get_dd(ds->ds_dir, propname,
 218             intsz, numints, buf, setpoint, snapshot));
 219 }
 220
 221 /*
 222  * Register interest in the named property.  We'll call the callback
 223  * once to notify it of the current property value, and again each time
 224  * the property changes, until this callback is unregistered.
 225  *
 226  * Return 0 on success, errno if the prop is not an integer value.
 227  */
 228 int
 229 dsl_prop_register(dsl_dataset_t *ds, const char *propname,
 230     dsl_prop_changed_cb_t *callback, void *cbarg)
 231 {
 232         dsl_dir_t *dd = ds->ds_dir;
 233         dsl_pool_t *dp = dd->dd_pool;
 234         uint64_t value;
 235         dsl_prop_cb_record_t *cbr;
 236         int err;
 237         int need_rwlock;
 238
 239         need_rwlock = !RW_WRITE_HELD(&dp->dp_config_rwlock);
 240         if (need_rwlock)
 241                 rw_enter(&dp->dp_config_rwlock, RW_READER);
 242
 243         err = dsl_prop_get_ds(ds, propname, 8, 1, &value, NULL);
 244         if (err != 0) {
 245                 if (need_rwlock)
 246                         rw_exit(&dp->dp_config_rwlock);
 247                 return (err);
 248         }
 249
 250         cbr = kmem_alloc(sizeof (dsl_prop_cb_record_t), KM_SLEEP);
 251         cbr->cbr_ds = ds;
 252         cbr->cbr_propname = kmem_alloc(strlen(propname)+1, KM_SLEEP);
 253         (void) strcpy((char *)cbr->cbr_propname, propname);
 254         cbr->cbr_func = callback;
 255         cbr->cbr_arg = cbarg;
 256         mutex_enter(&dd->dd_lock);
 257         list_insert_head(&dd->dd_prop_cbs, cbr);
 258         mutex_exit(&dd->dd_lock);
 259
 260         cbr->cbr_func(cbr->cbr_arg, value);
 261
 262         if (need_rwlock)
 263                 rw_exit(&dp->dp_config_rwlock);
 264         return (0);
 265 }
 266
 267 int
 268 dsl_prop_get(const char *dsname, const char *propname,
 269     int intsz, int numints, void *buf, char *setpoint)
 270 {
 271         dsl_dataset_t *ds;
 272         int err;
 273
 274         err = dsl_dataset_hold(dsname, FTAG, &ds);
 275         if (err)
 276                 return (err);
 277
 278         rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
 279         err = dsl_prop_get_ds(ds, propname, intsz, numints, buf, setpoint);
 280         rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
 281
 282         dsl_dataset_rele(ds, FTAG);
 283         return (err);
 284 }
 285
 286 /*
 287  * Get the current property value.  It may have changed by the time this
 288  * function returns, so it is NOT safe to follow up with
 289  * dsl_prop_register() and assume that the value has not changed in
 290  * between.
 291  *
 292  * Return 0 on success, ENOENT if ddname is invalid.
 293  */
 294 int
 295 dsl_prop_get_integer(const char *ddname, const char *propname,
 296     uint64_t *valuep, char *setpoint)
 297 {
 298         return (dsl_prop_get(ddname, propname, 8, 1, valuep, setpoint));
 299 }
 300
 301 void
 302 dsl_prop_setarg_init_uint64(dsl_prop_setarg_t *psa, const char *propname,
 303     zprop_source_t source, uint64_t *value)
 304 {
 305         psa->psa_name = propname;
 306         psa->psa_source = source;
 307         psa->psa_intsz = 8;
 308         psa->psa_numints = 1;
 309         psa->psa_value = value;
 310
 311         psa->psa_effective_value = -1ULL;
 312 }
 313
 314 /*
 315  * Predict the effective value of the given special property if it were set with
 316  * the given value and source. This is not a general purpose function. It exists
 317  * only to handle the special requirements of the quota and reservation
 318  * properties. The fact that these properties are non-inheritable greatly
 319  * simplifies the prediction logic.
 320  *
 321  * Returns 0 on success, a positive error code on failure, or -1 if called with
 322  * a property not handled by this function.
 323  */
 324 int
 325 dsl_prop_predict_sync(dsl_dir_t *dd, dsl_prop_setarg_t *psa)
 326 {
 327         const char *propname = psa->psa_name;
 328         zfs_prop_t prop = zfs_name_to_prop(propname);
 329         zprop_source_t source = psa->psa_source;
 330         objset_t *mos;
 331         uint64_t zapobj;
 332         uint64_t version;
 333         char *recvdstr;
 334         int err = 0;
 335
 336         switch (prop) {
 337         case ZFS_PROP_QUOTA:
 338         case ZFS_PROP_RESERVATION:
 339         case ZFS_PROP_REFQUOTA:
 340         case ZFS_PROP_REFRESERVATION:
 341                 break;
 342         default:
 343                 return (-1);
 344         }
 345
 346         mos = dd->dd_pool->dp_meta_objset;
 347         zapobj = dd->dd_phys->dd_props_zapobj;
 348         recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
 349
 350         version = spa_version(dd->dd_pool->dp_spa);
 351         if (version < SPA_VERSION_RECVD_PROPS) {
 352                 if (source & ZPROP_SRC_NONE)
 353                         source = ZPROP_SRC_NONE;
 354                 else if (source & ZPROP_SRC_RECEIVED)
 355                         source = ZPROP_SRC_LOCAL;
 356         }
 357
 358         switch (source) {
 359         case ZPROP_SRC_NONE:
 360                 /* Revert to the received value, if any. */
 361                 err = zap_lookup(mos, zapobj, recvdstr, 8, 1,
 362                     &psa->psa_effective_value);
 363                 if (err == ENOENT)
 364                         psa->psa_effective_value = 0;
 365                 break;
 366         case ZPROP_SRC_LOCAL:
 367                 psa->psa_effective_value = *(uint64_t *)psa->psa_value;
 368                 break;
 369         case ZPROP_SRC_RECEIVED:
 370                 /*
 371                  * If there's no local setting, then the new received value will
 372                  * be the effective value.
 373                  */
 374                 err = zap_lookup(mos, zapobj, propname, 8, 1,
 375                     &psa->psa_effective_value);
 376                 if (err == ENOENT)
 377                         psa->psa_effective_value = *(uint64_t *)psa->psa_value;
 378                 break;
 379         case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
 380                 /*
 381                  * We're clearing the received value, so the local setting (if
 382                  * it exists) remains the effective value.
 383                  */
 384                 err = zap_lookup(mos, zapobj, propname, 8, 1,
 385                     &psa->psa_effective_value);
 386                 if (err == ENOENT)
 387                         psa->psa_effective_value = 0;
 388                 break;
 389         default:
 390                 cmn_err(CE_PANIC, "unexpected property source: %d", source);
 391         }
 392
 393         strfree(recvdstr);
 394
 395         if (err == ENOENT)
 396                 return (0);
 397
 398         return (err);
 399 }
 400
 401 #ifdef  ZFS_DEBUG
 402 void
 403 dsl_prop_check_prediction(dsl_dir_t *dd, dsl_prop_setarg_t *psa)
 404 {
 405         zfs_prop_t prop = zfs_name_to_prop(psa->psa_name);
 406         uint64_t intval;
 407         char setpoint[MAXNAMELEN];
 408         uint64_t version = spa_version(dd->dd_pool->dp_spa);
 409         int err;
 410
 411         if (version < SPA_VERSION_RECVD_PROPS) {
 412                 switch (prop) {
 413                 case ZFS_PROP_QUOTA:
 414                 case ZFS_PROP_RESERVATION:
 415                         return;
 416                 }
 417         }
 418
 419         err = dsl_prop_get_dd(dd, psa->psa_name, 8, 1, &intval,
 420             setpoint, B_FALSE);
 421         if (err == 0 && intval != psa->psa_effective_value) {
 422                 cmn_err(CE_PANIC, "%s property, source: %x, "
 423                     "predicted effective value: %llu, "
 424                     "actual effective value: %llu (setpoint: %s)",
 425                     psa->psa_name, psa->psa_source,
 426                     (unsigned long long)psa->psa_effective_value,
 427                     (unsigned long long)intval, setpoint);
 428         }
 429 }
 430 #endif
 431
 432 /*
 433  * Unregister this callback.  Return 0 on success, ENOENT if ddname is
 434  * invalid, ENOMSG if no matching callback registered.
 435  */
 436 int
 437 dsl_prop_unregister(dsl_dataset_t *ds, const char *propname,
 438     dsl_prop_changed_cb_t *callback, void *cbarg)
 439 {
 440         dsl_dir_t *dd = ds->ds_dir;
 441         dsl_prop_cb_record_t *cbr;
 442
 443         mutex_enter(&dd->dd_lock);
 444         for (cbr = list_head(&dd->dd_prop_cbs);
 445             cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) {
 446                 if (cbr->cbr_ds == ds &&
 447                     cbr->cbr_func == callback &&
 448                     cbr->cbr_arg == cbarg &&
 449                     strcmp(cbr->cbr_propname, propname) == 0)
 450                         break;
 451         }
 452
 453         if (cbr == NULL) {
 454                 mutex_exit(&dd->dd_lock);
 455                 return (ENOMSG);
 456         }
 457
 458         list_remove(&dd->dd_prop_cbs, cbr);
 459         mutex_exit(&dd->dd_lock);
 460         kmem_free((void*)cbr->cbr_propname, strlen(cbr->cbr_propname)+1);
 461         kmem_free(cbr, sizeof (dsl_prop_cb_record_t));
 462
 463         return (0);
 464 }
 465
 466 /*
 467  * Return the number of callbacks that are registered for this dataset.
 468  */
 469 int
 470 dsl_prop_numcb(dsl_dataset_t *ds)
 471 {
 472         dsl_dir_t *dd = ds->ds_dir;
 473         dsl_prop_cb_record_t *cbr;
 474         int num = 0;
 475
 476         mutex_enter(&dd->dd_lock);
 477         for (cbr = list_head(&dd->dd_prop_cbs);
 478             cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) {
 479                 if (cbr->cbr_ds == ds)
 480                         num++;
 481         }
 482         mutex_exit(&dd->dd_lock);
 483
 484         return (num);
 485 }
 486
 487 static void
 488 dsl_prop_changed_notify(dsl_pool_t *dp, uint64_t ddobj,
 489     const char *propname, uint64_t value, int first)
 490 {
 491         dsl_dir_t *dd;
 492         dsl_prop_cb_record_t *cbr;
 493         objset_t *mos = dp->dp_meta_objset;
 494         zap_cursor_t zc;
 495         zap_attribute_t *za;
 496         int err;
 497
 498         ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock));
 499         err = dsl_dir_open_obj(dp, ddobj, NULL, FTAG, &dd);
 500         if (err)
 501                 return;
 502
 503         if (!first) {
 504                 /*
 505                  * If the prop is set here, then this change is not
 506                  * being inherited here or below; stop the recursion.
 507                  */
 508                 err = zap_contains(mos, dd->dd_phys->dd_props_zapobj, propname);
 509                 if (err == 0) {
 510                         dsl_dir_close(dd, FTAG);
 511                         return;
 512                 }
 513                 ASSERT3U(err, ==, ENOENT);
 514         }
 515
 516         mutex_enter(&dd->dd_lock);
 517         for (cbr = list_head(&dd->dd_prop_cbs); cbr;
 518             cbr = list_next(&dd->dd_prop_cbs, cbr)) {
 519                 uint64_t propobj = cbr->cbr_ds->ds_phys->ds_props_obj;
 520
 521                 if (strcmp(cbr->cbr_propname, propname) != 0)
 522                         continue;
 523
 524                 /*
 525                  * If the property is set on this ds, then it is not
 526                  * inherited here; don't call the callback.
 527                  */
 528                 if (propobj && 0 == zap_contains(mos, propobj, propname))
 529                         continue;
 530
 531                 cbr->cbr_func(cbr->cbr_arg, value);
 532         }
 533         mutex_exit(&dd->dd_lock);
 534
 535         za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
 536         for (zap_cursor_init(&zc, mos,
 537             dd->dd_phys->dd_child_dir_zapobj);
 538             zap_cursor_retrieve(&zc, za) == 0;
 539             zap_cursor_advance(&zc)) {
 540                 dsl_prop_changed_notify(dp, za->za_first_integer,
 541                     propname, value, FALSE);
 542         }
 543         kmem_free(za, sizeof (zap_attribute_t));
 544         zap_cursor_fini(&zc);
 545         dsl_dir_close(dd, FTAG);
 546 }
 547
 548 void
 549 dsl_prop_set_sync(void *arg1, void *arg2, dmu_tx_t *tx)
 550 {
 551         dsl_dataset_t *ds = arg1;
 552         dsl_prop_setarg_t *psa = arg2;
 553         objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
 554         uint64_t zapobj, intval, dummy;
 555         int isint;
 556         char valbuf[32];
 557         char *valstr = NULL;
 558         char *inheritstr;
 559         char *recvdstr;
 560         char *tbuf = NULL;
 561         int err;
 562         uint64_t version = spa_version(ds->ds_dir->dd_pool->dp_spa);
 563         const char *propname = psa->psa_name;
 564         zprop_source_t source = psa->psa_source;
 565
 566         isint = (dodefault(propname, 8, 1, &intval) == 0);
 567
 568         if (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds)) {
 569                 ASSERT(version >= SPA_VERSION_SNAP_PROPS);
 570                 if (ds->ds_phys->ds_props_obj == 0) {
 571                         dmu_buf_will_dirty(ds->ds_dbuf, tx);
 572                         ds->ds_phys->ds_props_obj =
 573                             zap_create(mos,
 574                             DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
 575                 }
 576                 zapobj = ds->ds_phys->ds_props_obj;
 577         } else {
 578                 zapobj = ds->ds_dir->dd_phys->dd_props_zapobj;
 579         }
 580
 581         if (version < SPA_VERSION_RECVD_PROPS) {
 582                 zfs_prop_t prop = zfs_name_to_prop(propname);
 583                 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION)
 584                         return;
 585
 586                 if (source & ZPROP_SRC_NONE)
 587                         source = ZPROP_SRC_NONE;
 588                 else if (source & ZPROP_SRC_RECEIVED)
 589                         source = ZPROP_SRC_LOCAL;
 590         }
 591
 592         inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
 593         recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);
 594
 595         switch (source) {
 596         case ZPROP_SRC_NONE:
 597                 /*
 598                  * revert to received value, if any (inherit -S)
 599                  * - remove propname
 600                  * - remove propname$inherit
 601                  */
 602                 err = zap_remove(mos, zapobj, propname, tx);
 603                 ASSERT(err == 0 || err == ENOENT);
 604                 err = zap_remove(mos, zapobj, inheritstr, tx);
 605                 ASSERT(err == 0 || err == ENOENT);
 606                 break;
 607         case ZPROP_SRC_LOCAL:
 608                 /*
 609                  * remove propname$inherit
 610                  * set propname -> value
 611                  */
 612                 err = zap_remove(mos, zapobj, inheritstr, tx);
 613                 ASSERT(err == 0 || err == ENOENT);
 614                 VERIFY(0 == zap_update(mos, zapobj, propname,
 615                     psa->psa_intsz, psa->psa_numints, psa->psa_value, tx));
 616                 break;
 617         case ZPROP_SRC_INHERITED:
 618                 /*
 619                  * explicitly inherit
 620                  * - remove propname
 621                  * - set propname$inherit
 622                  */
 623                 err = zap_remove(mos, zapobj, propname, tx);
 624                 ASSERT(err == 0 || err == ENOENT);
 625                 if (version >= SPA_VERSION_RECVD_PROPS &&
 626                     dsl_prop_get_ds(ds, ZPROP_HAS_RECVD, 8, 1, &dummy,
 627                     NULL) == 0) {
 628                         dummy = 0;
 629                         err = zap_update(mos, zapobj, inheritstr,
 630                             8, 1, &dummy, tx);
 631                         ASSERT(err == 0);
 632                 }
 633                 break;
 634         case ZPROP_SRC_RECEIVED:
 635                 /*
 636                  * set propname$recvd -> value
 637                  */
 638                 err = zap_update(mos, zapobj, recvdstr,
 639                     psa->psa_intsz, psa->psa_numints, psa->psa_value, tx);
 640                 ASSERT(err == 0);
 641                 break;
 642         case (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED):
 643                 /*
 644                  * clear local and received settings
 645                  * - remove propname
 646                  * - remove propname$inherit
 647                  * - remove propname$recvd
 648                  */
 649                 err = zap_remove(mos, zapobj, propname, tx);
 650                 ASSERT(err == 0 || err == ENOENT);
 651                 err = zap_remove(mos, zapobj, inheritstr, tx);
 652                 ASSERT(err == 0 || err == ENOENT);
 653                 /* FALLTHRU */
 654         case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
 655                 /*
 656                  * remove propname$recvd
 657                  */
 658                 err = zap_remove(mos, zapobj, recvdstr, tx);
 659                 ASSERT(err == 0 || err == ENOENT);
 660                 break;
 661         default:
 662                 cmn_err(CE_PANIC, "unexpected property source: %d", source);
 663         }
 664
 665         strfree(inheritstr);
 666         strfree(recvdstr);
 667
 668         if (isint) {
 669                 VERIFY(0 == dsl_prop_get_ds(ds, propname, 8, 1, &intval, NULL));
 670
 671                 if (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds)) {
 672                         dsl_prop_cb_record_t *cbr;
 673                         /*
 674                          * It's a snapshot; nothing can inherit this
 675                          * property, so just look for callbacks on this
 676                          * ds here.
 677                          */
 678                         mutex_enter(&ds->ds_dir->dd_lock);
 679                         for (cbr = list_head(&ds->ds_dir->dd_prop_cbs); cbr;
 680                             cbr = list_next(&ds->ds_dir->dd_prop_cbs, cbr)) {
 681                                 if (cbr->cbr_ds == ds &&
 682                                     strcmp(cbr->cbr_propname, propname) == 0)
 683                                         cbr->cbr_func(cbr->cbr_arg, intval);
 684                         }
 685                         mutex_exit(&ds->ds_dir->dd_lock);
 686                 } else {
 687                         dsl_prop_changed_notify(ds->ds_dir->dd_pool,
 688                             ds->ds_dir->dd_object, propname, intval, TRUE);
 689                 }
 690
 691                 (void) snprintf(valbuf, sizeof (valbuf),
 692                     "%lld", (longlong_t)intval);
 693                 valstr = valbuf;
 694         } else {
 695                 if (source == ZPROP_SRC_LOCAL) {
 696                         valstr = (char *)psa->psa_value;
 697                 } else {
 698                         tbuf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
 699                         if (dsl_prop_get_ds(ds, propname, 1,
 700                             ZAP_MAXVALUELEN, tbuf, NULL) == 0)
 701                                 valstr = tbuf;
 702                 }
 703         }
 704
 705         spa_history_log_internal((source == ZPROP_SRC_NONE ||
 706             source == ZPROP_SRC_INHERITED) ? LOG_DS_INHERIT :
 707             LOG_DS_PROPSET, ds->ds_dir->dd_pool->dp_spa, tx,
 708             "%s=%s dataset = %llu", propname,
 709             (valstr == NULL ? "" : valstr), ds->ds_object);
 710
 711         if (tbuf != NULL)
 712                 kmem_free(tbuf, ZAP_MAXVALUELEN);
 713 }
 714
 715 void
 716 dsl_props_set_sync(void *arg1, void *arg2, dmu_tx_t *tx)
 717 {
 718         dsl_dataset_t *ds = arg1;
 719         dsl_props_arg_t *pa = arg2;
 720         nvlist_t *props = pa->pa_props;
 721         dsl_prop_setarg_t psa;
 722         nvpair_t *elem = NULL;
 723
 724         psa.psa_source = pa->pa_source;
 725
 726         while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
 727                 nvpair_t *pair = elem;
 728
 729                 psa.psa_name = nvpair_name(pair);
 730
 731                 if (nvpair_type(pair) == DATA_TYPE_NVLIST) {
 732                         /*
 733                          * dsl_prop_get_all_impl() returns properties in this
 734                          * format.
 735                          */
 736                         nvlist_t *attrs;
 737                         VERIFY(nvpair_value_nvlist(pair, &attrs) == 0);
 738                         VERIFY(nvlist_lookup_nvpair(attrs, ZPROP_VALUE,
 739                             &pair) == 0);
 740                 }
 741
 742                 if (nvpair_type(pair) == DATA_TYPE_STRING) {
 743                         VERIFY(nvpair_value_string(pair,
 744                             (char **)&psa.psa_value) == 0);
 745                         psa.psa_intsz = 1;
 746                         psa.psa_numints = strlen(psa.psa_value) + 1;
 747                 } else {
 748                         uint64_t intval;
 749                         VERIFY(nvpair_value_uint64(pair, &intval) == 0);
 750                         psa.psa_intsz = sizeof (intval);
 751                         psa.psa_numints = 1;
 752                         psa.psa_value = &intval;
 753                 }
 754                 dsl_prop_set_sync(ds, &psa, tx);
 755         }
 756 }
 757
 758 void
 759 dsl_dir_prop_set_uint64_sync(dsl_dir_t *dd, const char *name, uint64_t val,
 760     dmu_tx_t *tx)
 761 {
 762         objset_t *mos = dd->dd_pool->dp_meta_objset;
 763         uint64_t zapobj = dd->dd_phys->dd_props_zapobj;
 764
 765         ASSERT(dmu_tx_is_syncing(tx));
 766
 767         VERIFY(0 == zap_update(mos, zapobj, name, sizeof (val), 1, &val, tx));
 768
 769         dsl_prop_changed_notify(dd->dd_pool, dd->dd_object, name, val, TRUE);
 770
 771         spa_history_log_internal(LOG_DS_PROPSET, dd->dd_pool->dp_spa, tx,
 772             "%s=%llu dataset = %llu", name, (u_longlong_t)val,
 773             dd->dd_phys->dd_head_dataset_obj);
 774 }
 775
 776 int
 777 dsl_prop_set(const char *dsname, const char *propname, zprop_source_t source,
 778     int intsz, int numints, const void *buf)
 779 {
 780         dsl_dataset_t *ds;
 781         uint64_t version;
 782         int err;
 783         dsl_prop_setarg_t psa;
 784
 785         /*
 786          * We must do these checks before we get to the syncfunc, since
 787          * it can't fail.
 788          */
 789         if (strlen(propname) >= ZAP_MAXNAMELEN)
 790                 return (ENAMETOOLONG);
 791
 792         err = dsl_dataset_hold(dsname, FTAG, &ds);
 793         if (err)
 794                 return (err);
 795
 796         version = spa_version(ds->ds_dir->dd_pool->dp_spa);
 797         if (intsz * numints >= (version < SPA_VERSION_STMF_PROP ?
 798             ZAP_OLDMAXVALUELEN : ZAP_MAXVALUELEN)) {
 799                 dsl_dataset_rele(ds, FTAG);
 800                 return (E2BIG);
 801         }
 802         if (dsl_dataset_is_snapshot(ds) &&
 803             version < SPA_VERSION_SNAP_PROPS) {
 804                 dsl_dataset_rele(ds, FTAG);
 805                 return (ENOTSUP);
 806         }
 807
 808         psa.psa_name = propname;
 809         psa.psa_source = source;
 810         psa.psa_intsz = intsz;
 811         psa.psa_numints = numints;
 812         psa.psa_value = buf;
 813         psa.psa_effective_value = -1ULL;
 814
 815         err = dsl_sync_task_do(ds->ds_dir->dd_pool,
 816             NULL, dsl_prop_set_sync, ds, &psa, 2);
 817
 818         dsl_dataset_rele(ds, FTAG);
 819         return (err);
 820 }
 821
 822 int
 823 dsl_props_set(const char *dsname, zprop_source_t source, nvlist_t *props)
 824 {
 825         dsl_dataset_t *ds;
 826         uint64_t version;
 827         nvpair_t *elem = NULL;
 828         dsl_props_arg_t pa;
 829         int err;
 830
 831         if (err = dsl_dataset_hold(dsname, FTAG, &ds))
 832                 return (err);
 833         /*
 834          * Do these checks before the syncfunc, since it can't fail.
 835          */
 836         version = spa_version(ds->ds_dir->dd_pool->dp_spa);
 837         while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
 838                 if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
 839                         dsl_dataset_rele(ds, FTAG);
 840                         return (ENAMETOOLONG);
 841                 }
 842                 if (nvpair_type(elem) == DATA_TYPE_STRING) {
 843                         char *valstr;
 844                         VERIFY(nvpair_value_string(elem, &valstr) == 0);
 845                         if (strlen(valstr) >= (version <
 846                             SPA_VERSION_STMF_PROP ?
 847                             ZAP_OLDMAXVALUELEN : ZAP_MAXVALUELEN)) {
 848                                 dsl_dataset_rele(ds, FTAG);
 849                                 return (E2BIG);
 850                         }
 851                 }
 852         }
 853
 854         if (dsl_dataset_is_snapshot(ds) &&
 855             version < SPA_VERSION_SNAP_PROPS) {
 856                 dsl_dataset_rele(ds, FTAG);
 857                 return (ENOTSUP);
 858         }
 859
 860         pa.pa_props = props;
 861         pa.pa_source = source;
 862
 863         err = dsl_sync_task_do(ds->ds_dir->dd_pool,
 864             NULL, dsl_props_set_sync, ds, &pa, 2);
 865
 866         dsl_dataset_rele(ds, FTAG);
 867         return (err);
 868 }
 869
 870 typedef enum dsl_prop_getflags {
 871         DSL_PROP_GET_INHERITING = 0x1,  /* searching parent of target ds */
 872         DSL_PROP_GET_SNAPSHOT = 0x2,    /* snapshot dataset */
 873         DSL_PROP_GET_LOCAL = 0x4,       /* local properties */
 874         DSL_PROP_GET_RECEIVED = 0x8     /* received properties */
 875 } dsl_prop_getflags_t;
 876
 877 static int
 878 dsl_prop_get_all_impl(objset_t *mos, uint64_t propobj,
 879     const char *setpoint, dsl_prop_getflags_t flags, nvlist_t *nv)
 880 {
 881         zap_cursor_t zc;
 882         zap_attribute_t za;
 883         int err = 0;
 884
 885         for (zap_cursor_init(&zc, mos, propobj);
 886             (err = zap_cursor_retrieve(&zc, &za)) == 0;
 887             zap_cursor_advance(&zc)) {
 888                 nvlist_t *propval;
 889                 zfs_prop_t prop;
 890                 char buf[ZAP_MAXNAMELEN];
 891                 char *valstr;
 892                 const char *suffix;
 893                 const char *propname;
 894                 const char *source;
 895
 896                 suffix = strchr(za.za_name, '$');
 897
 898                 if (suffix == NULL) {
 899                         /*
 900                          * Skip local properties if we only want received
 901                          * properties.
 902                          */
 903                         if (flags & DSL_PROP_GET_RECEIVED)
 904                                 continue;
 905
 906                         propname = za.za_name;
 907                         source = setpoint;
 908                 } else if (strcmp(suffix, ZPROP_INHERIT_SUFFIX) == 0) {
 909                         /* Skip explicitly inherited entries. */
 910                         continue;
 911                 } else if (strcmp(suffix, ZPROP_RECVD_SUFFIX) == 0) {
 912                         if (flags & DSL_PROP_GET_LOCAL)
 913                                 continue;
 914
 915                         (void) strncpy(buf, za.za_name, (suffix - za.za_name));
 916                         buf[suffix - za.za_name] = '\0';
 917                         propname = buf;
 918
 919                         if (!(flags & DSL_PROP_GET_RECEIVED)) {
 920                                 /* Skip if locally overridden. */
 921                                 err = zap_contains(mos, propobj, propname);
 922                                 if (err == 0)
 923                                         continue;
 924                                 if (err != ENOENT)
 925                                         break;
 926
 927                                 /* Skip if explicitly inherited. */
 928                                 valstr = kmem_asprintf("%s%s", propname,
 929                                     ZPROP_INHERIT_SUFFIX);
 930                                 err = zap_contains(mos, propobj, valstr);
 931                                 strfree(valstr);
 932                                 if (err == 0)
 933                                         continue;
 934                                 if (err != ENOENT)
 935                                         break;
 936                         }
 937
 938                         source = ((flags & DSL_PROP_GET_INHERITING) ?
 939                             setpoint : ZPROP_SOURCE_VAL_RECVD);
 940                 } else {
 941                         /*
 942                          * For backward compatibility, skip suffixes we don't
 943                          * recognize.
 944                          */
 945                         continue;
 946                 }
 947
 948                 prop = zfs_name_to_prop(propname);
 949
 950                 /* Skip non-inheritable properties. */
 951                 if ((flags & DSL_PROP_GET_INHERITING) && prop != ZPROP_INVAL &&
 952                     !zfs_prop_inheritable(prop))
 953                         continue;
 954
 955                 /* Skip properties not valid for this type. */
 956                 if ((flags & DSL_PROP_GET_SNAPSHOT) && prop != ZPROP_INVAL &&
 957                     !zfs_prop_valid_for_type(prop, ZFS_TYPE_SNAPSHOT))
 958                         continue;
 959
 960                 /* Skip properties already defined. */
 961                 if (nvlist_exists(nv, propname))
 962                         continue;
 963
 964                 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
 965                 if (za.za_integer_length == 1) {
 966                         /*
 967                          * String property
 968                          */
 969                         char *tmp = kmem_alloc(za.za_num_integers,
 970                             KM_SLEEP);
 971                         err = zap_lookup(mos, propobj,
 972                             za.za_name, 1, za.za_num_integers, tmp);
 973                         if (err != 0) {
 974                                 kmem_free(tmp, za.za_num_integers);
 975                                 break;
 976                         }
 977                         VERIFY(nvlist_add_string(propval, ZPROP_VALUE,
 978                             tmp) == 0);
 979                         kmem_free(tmp, za.za_num_integers);
 980                 } else {
 981                         /*
 982                          * Integer property
 983                          */
 984                         ASSERT(za.za_integer_length == 8);
 985                         (void) nvlist_add_uint64(propval, ZPROP_VALUE,
 986                             za.za_first_integer);
 987                 }
 988
 989                 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, source) == 0);
 990                 VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
 991                 nvlist_free(propval);
 992         }
 993         zap_cursor_fini(&zc);
 994         if (err == ENOENT)
 995                 err = 0;
 996         return (err);
 997 }
 998
 999 /*
1000  * Iterate over all properties for this dataset and return them in an nvlist.
1001  */
1002 static int
1003 dsl_prop_get_all_ds(dsl_dataset_t *ds, nvlist_t **nvp,
1004     dsl_prop_getflags_t flags)
1005 {
1006         dsl_dir_t *dd = ds->ds_dir;
1007         dsl_pool_t *dp = dd->dd_pool;
1008         objset_t *mos = dp->dp_meta_objset;
1009         int err = 0;
1010         char setpoint[MAXNAMELEN];
1011
1012         VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1013
1014         if (dsl_dataset_is_snapshot(ds))
1015                 flags |= DSL_PROP_GET_SNAPSHOT;
1016
1017         rw_enter(&dp->dp_config_rwlock, RW_READER);
1018
1019         if (ds->ds_phys->ds_props_obj != 0) {
1020                 ASSERT(flags & DSL_PROP_GET_SNAPSHOT);
1021                 dsl_dataset_name(ds, setpoint);
1022                 err = dsl_prop_get_all_impl(mos, ds->ds_phys->ds_props_obj,
1023                     setpoint, flags, *nvp);
1024                 if (err)
1025                         goto out;
1026         }
1027
1028         for (; dd != NULL; dd = dd->dd_parent) {
1029                 if (dd != ds->ds_dir || (flags & DSL_PROP_GET_SNAPSHOT)) {
1030                         if (flags & (DSL_PROP_GET_LOCAL |
1031                             DSL_PROP_GET_RECEIVED))
1032                                 break;
1033                         flags |= DSL_PROP_GET_INHERITING;
1034                 }
1035                 dsl_dir_name(dd, setpoint);
1036                 err = dsl_prop_get_all_impl(mos, dd->dd_phys->dd_props_zapobj,
1037                     setpoint, flags, *nvp);
1038                 if (err)
1039                         break;
1040         }
1041 out:
1042         rw_exit(&dp->dp_config_rwlock);
1043         return (err);
1044 }
1045
1046 boolean_t
1047 dsl_prop_get_hasrecvd(objset_t *os)
1048 {
1049         dsl_dataset_t *ds = os->os_dsl_dataset;
1050         int rc;
1051         uint64_t dummy;
1052
1053         rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
1054         rc = dsl_prop_get_ds(ds, ZPROP_HAS_RECVD, 8, 1, &dummy, NULL);
1055         rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
1056         ASSERT(rc != 0 || spa_version(os->os_spa) >= SPA_VERSION_RECVD_PROPS);
1057         return (rc == 0);
1058 }
1059
1060 static void
1061 dsl_prop_set_hasrecvd_impl(objset_t *os, zprop_source_t source)
1062 {
1063         dsl_dataset_t *ds = os->os_dsl_dataset;
1064         uint64_t dummy = 0;
1065         dsl_prop_setarg_t psa;
1066
1067         if (spa_version(os->os_spa) < SPA_VERSION_RECVD_PROPS)
1068                 return;
1069
1070         dsl_prop_setarg_init_uint64(&psa, ZPROP_HAS_RECVD, source, &dummy);
1071
1072         (void) dsl_sync_task_do(ds->ds_dir->dd_pool, NULL,
1073             dsl_prop_set_sync, ds, &psa, 2);
1074 }
1075
1076 /*
1077  * Call after successfully receiving properties to ensure that only the first
1078  * receive on or after SPA_VERSION_RECVD_PROPS blows away local properties.
1079  */
1080 void
1081 dsl_prop_set_hasrecvd(objset_t *os)
1082 {
1083         if (dsl_prop_get_hasrecvd(os)) {
1084                 ASSERT(spa_version(os->os_spa) >= SPA_VERSION_RECVD_PROPS);
1085                 return;
1086         }
1087         dsl_prop_set_hasrecvd_impl(os, ZPROP_SRC_LOCAL);
1088 }
1089
1090 void
1091 dsl_prop_unset_hasrecvd(objset_t *os)
1092 {
1093         dsl_prop_set_hasrecvd_impl(os, ZPROP_SRC_NONE);
1094 }
1095
1096 int
1097 dsl_prop_get_all(objset_t *os, nvlist_t **nvp)
1098 {
1099         return (dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, 0));
1100 }
1101
1102 int
1103 dsl_prop_get_received(objset_t *os, nvlist_t **nvp)
1104 {
1105         /*
1106          * Received properties are not distinguishable from local properties
1107          * until the dataset has received properties on or after
1108          * SPA_VERSION_RECVD_PROPS.
1109          */
1110         dsl_prop_getflags_t flags = (dsl_prop_get_hasrecvd(os) ?
1111             DSL_PROP_GET_RECEIVED : DSL_PROP_GET_LOCAL);
1112         return (dsl_prop_get_all_ds(os->os_dsl_dataset, nvp, flags));
1113 }
1114
1115 void
1116 dsl_prop_nvlist_add_uint64(nvlist_t *nv, zfs_prop_t prop, uint64_t value)
1117 {
1118         nvlist_t *propval;
1119         const char *propname = zfs_prop_to_name(prop);
1120         uint64_t default_value;
1121
1122         if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1123                 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1124                 return;
1125         }
1126
1127         VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1128         VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0);
1129         /* Indicate the default source if we can. */
1130         if (dodefault(propname, 8, 1, &default_value) == 0 &&
1131             value == default_value) {
1132                 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, "") == 0);
1133         }
1134         VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1135         nvlist_free(propval);
1136 }
1137
1138 void
1139 dsl_prop_nvlist_add_string(nvlist_t *nv, zfs_prop_t prop, const char *value)
1140 {
1141         nvlist_t *propval;
1142         const char *propname = zfs_prop_to_name(prop);
1143
1144         if (nvlist_lookup_nvlist(nv, propname, &propval) == 0) {
1145                 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1146                 return;
1147         }
1148
1149         VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0);
1150         VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0);
1151         VERIFY(nvlist_add_nvlist(nv, propname, propval) == 0);
1152         nvlist_free(propval);
1153 }