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 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/dmu.h> 29 #include <sys/dmu_objset.h> 30 #include <sys/dmu_tx.h> 31 #include <sys/dsl_dataset.h> 32 #include <sys/dsl_dir.h> 33 #include <sys/dsl_prop.h> 34 #include <sys/dsl_synctask.h> 35 #include <sys/spa.h> 36 #include <sys/zio_checksum.h> /* for the default checksum value */ 37 #include <sys/zap.h> 38 #include <sys/fs/zfs.h> 39 40 #include "zfs_prop.h" 41 42 static int 43 dodefault(const char *propname, int intsz, int numint, 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 numint); 61 } else { 62 if (intsz != 8 || numint < 1) 63 return (EOVERFLOW); 64 65 *(uint64_t *)buf = zfs_prop_default_numeric(prop); 66 } 67 68 return (0); 69 } 70 71 static int 72 dsl_prop_get_impl(dsl_dir_t *dd, const char *propname, 73 int intsz, int numint, void *buf, char *setpoint) 74 { 75 int err = ENOENT; 76 zfs_prop_t prop; 77 78 if (setpoint) 79 setpoint[0] = '\0'; 80 81 prop = zfs_name_to_prop(propname); 82 83 /* 84 * Note: dd may be NULL, therefore we shouldn't dereference it 85 * ouside this loop. 86 */ 87 for (; dd != NULL; dd = dd->dd_parent) { 88 objset_t *mos = dd->dd_pool->dp_meta_objset; 89 ASSERT(RW_LOCK_HELD(&dd->dd_pool->dp_config_rwlock)); 90 err = zap_lookup(mos, dd->dd_phys->dd_props_zapobj, 91 propname, intsz, numint, buf); 92 if (err != ENOENT) { 93 if (setpoint) 94 dsl_dir_name(dd, setpoint); 95 break; 96 } 97 98 /* 99 * Break out of this loop for non-inheritable properties. 100 */ 101 if (prop != ZPROP_INVAL && !zfs_prop_inheritable(prop)) 102 break; 103 } 104 if (err == ENOENT) 105 err = dodefault(propname, intsz, numint, buf); 106 107 return (err); 108 } 109 110 /* 111 * Register interest in the named property. We'll call the callback 112 * once to notify it of the current property value, and again each time 113 * the property changes, until this callback is unregistered. 114 * 115 * Return 0 on success, errno if the prop is not an integer value. 116 */ 117 int 118 dsl_prop_register(dsl_dataset_t *ds, const char *propname, 119 dsl_prop_changed_cb_t *callback, void *cbarg) 120 { 121 dsl_dir_t *dd = ds->ds_dir; 122 uint64_t value; 123 dsl_prop_cb_record_t *cbr; 124 int err; 125 int need_rwlock; 126 127 need_rwlock = !RW_WRITE_HELD(&dd->dd_pool->dp_config_rwlock); 128 if (need_rwlock) 129 rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER); 130 131 err = dsl_prop_get_impl(dd, propname, 8, 1, &value, NULL); 132 if (err != 0) { 133 if (need_rwlock) 134 rw_exit(&dd->dd_pool->dp_config_rwlock); 135 return (err); 136 } 137 138 cbr = kmem_alloc(sizeof (dsl_prop_cb_record_t), KM_SLEEP); 139 cbr->cbr_ds = ds; 140 cbr->cbr_propname = kmem_alloc(strlen(propname)+1, KM_SLEEP); 141 (void) strcpy((char *)cbr->cbr_propname, propname); 142 cbr->cbr_func = callback; 143 cbr->cbr_arg = cbarg; 144 mutex_enter(&dd->dd_lock); 145 list_insert_head(&dd->dd_prop_cbs, cbr); 146 mutex_exit(&dd->dd_lock); 147 148 cbr->cbr_func(cbr->cbr_arg, value); 149 150 VERIFY(0 == dsl_dir_open_obj(dd->dd_pool, dd->dd_object, 151 NULL, cbr, &dd)); 152 if (need_rwlock) 153 rw_exit(&dd->dd_pool->dp_config_rwlock); 154 /* Leave dataset open until this callback is unregistered */ 155 return (0); 156 } 157 158 int 159 dsl_prop_get_ds(dsl_dir_t *dd, const char *propname, 160 int intsz, int numints, void *buf, char *setpoint) 161 { 162 int err; 163 164 rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER); 165 err = dsl_prop_get_impl(dd, propname, intsz, numints, buf, setpoint); 166 rw_exit(&dd->dd_pool->dp_config_rwlock); 167 168 return (err); 169 } 170 171 /* 172 * Get property when config lock is already held. 173 */ 174 int dsl_prop_get_ds_locked(dsl_dir_t *dd, const char *propname, 175 int intsz, int numints, void *buf, char *setpoint) 176 { 177 ASSERT(RW_LOCK_HELD(&dd->dd_pool->dp_config_rwlock)); 178 return (dsl_prop_get_impl(dd, propname, intsz, numints, buf, setpoint)); 179 } 180 181 int 182 dsl_prop_get(const char *ddname, const char *propname, 183 int intsz, int numints, void *buf, char *setpoint) 184 { 185 dsl_dir_t *dd; 186 const char *tail; 187 int err; 188 189 err = dsl_dir_open(ddname, FTAG, &dd, &tail); 190 if (err) 191 return (err); 192 if (tail && tail[0] != '@') { 193 dsl_dir_close(dd, FTAG); 194 return (ENOENT); 195 } 196 197 err = dsl_prop_get_ds(dd, propname, intsz, numints, buf, setpoint); 198 199 dsl_dir_close(dd, FTAG); 200 return (err); 201 } 202 203 /* 204 * Get the current property value. It may have changed by the time this 205 * function returns, so it is NOT safe to follow up with 206 * dsl_prop_register() and assume that the value has not changed in 207 * between. 208 * 209 * Return 0 on success, ENOENT if ddname is invalid. 210 */ 211 int 212 dsl_prop_get_integer(const char *ddname, const char *propname, 213 uint64_t *valuep, char *setpoint) 214 { 215 return (dsl_prop_get(ddname, propname, 8, 1, valuep, setpoint)); 216 } 217 218 /* 219 * Unregister this callback. Return 0 on success, ENOENT if ddname is 220 * invalid, ENOMSG if no matching callback registered. 221 */ 222 int 223 dsl_prop_unregister(dsl_dataset_t *ds, const char *propname, 224 dsl_prop_changed_cb_t *callback, void *cbarg) 225 { 226 dsl_dir_t *dd = ds->ds_dir; 227 dsl_prop_cb_record_t *cbr; 228 229 mutex_enter(&dd->dd_lock); 230 for (cbr = list_head(&dd->dd_prop_cbs); 231 cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) { 232 if (cbr->cbr_ds == ds && 233 cbr->cbr_func == callback && 234 cbr->cbr_arg == cbarg && 235 strcmp(cbr->cbr_propname, propname) == 0) 236 break; 237 } 238 239 if (cbr == NULL) { 240 mutex_exit(&dd->dd_lock); 241 return (ENOMSG); 242 } 243 244 list_remove(&dd->dd_prop_cbs, cbr); 245 mutex_exit(&dd->dd_lock); 246 kmem_free((void*)cbr->cbr_propname, strlen(cbr->cbr_propname)+1); 247 kmem_free(cbr, sizeof (dsl_prop_cb_record_t)); 248 249 /* Clean up from dsl_prop_register */ 250 dsl_dir_close(dd, cbr); 251 return (0); 252 } 253 254 /* 255 * Return the number of callbacks that are registered for this dataset. 256 */ 257 int 258 dsl_prop_numcb(dsl_dataset_t *ds) 259 { 260 dsl_dir_t *dd = ds->ds_dir; 261 dsl_prop_cb_record_t *cbr; 262 int num = 0; 263 264 mutex_enter(&dd->dd_lock); 265 for (cbr = list_head(&dd->dd_prop_cbs); 266 cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) { 267 if (cbr->cbr_ds == ds) 268 num++; 269 } 270 mutex_exit(&dd->dd_lock); 271 272 return (num); 273 } 274 275 static void 276 dsl_prop_changed_notify(dsl_pool_t *dp, uint64_t ddobj, 277 const char *propname, uint64_t value, int first) 278 { 279 dsl_dir_t *dd; 280 dsl_prop_cb_record_t *cbr; 281 objset_t *mos = dp->dp_meta_objset; 282 zap_cursor_t zc; 283 zap_attribute_t *za; 284 int err; 285 286 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 287 err = dsl_dir_open_obj(dp, ddobj, NULL, FTAG, &dd); 288 if (err) 289 return; 290 291 if (!first) { 292 /* 293 * If the prop is set here, then this change is not 294 * being inherited here or below; stop the recursion. 295 */ 296 err = zap_lookup(mos, dd->dd_phys->dd_props_zapobj, propname, 297 8, 1, &value); 298 if (err == 0) { 299 dsl_dir_close(dd, FTAG); 300 return; 301 } 302 ASSERT3U(err, ==, ENOENT); 303 } 304 305 mutex_enter(&dd->dd_lock); 306 for (cbr = list_head(&dd->dd_prop_cbs); 307 cbr; cbr = list_next(&dd->dd_prop_cbs, cbr)) { 308 if (strcmp(cbr->cbr_propname, propname) == 0) { 309 cbr->cbr_func(cbr->cbr_arg, value); 310 } 311 } 312 mutex_exit(&dd->dd_lock); 313 314 za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 315 for (zap_cursor_init(&zc, mos, 316 dd->dd_phys->dd_child_dir_zapobj); 317 zap_cursor_retrieve(&zc, za) == 0; 318 zap_cursor_advance(&zc)) { 319 dsl_prop_changed_notify(dp, za->za_first_integer, 320 propname, value, FALSE); 321 } 322 kmem_free(za, sizeof (zap_attribute_t)); 323 zap_cursor_fini(&zc); 324 dsl_dir_close(dd, FTAG); 325 } 326 327 struct prop_set_arg { 328 const char *name; 329 int intsz; 330 int numints; 331 const void *buf; 332 }; 333 334 335 static void 336 dsl_prop_set_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 337 { 338 dsl_dir_t *dd = arg1; 339 struct prop_set_arg *psa = arg2; 340 objset_t *mos = dd->dd_pool->dp_meta_objset; 341 uint64_t zapobj = dd->dd_phys->dd_props_zapobj; 342 uint64_t intval; 343 int isint; 344 char valbuf[32]; 345 char *valstr; 346 347 isint = (dodefault(psa->name, 8, 1, &intval) == 0); 348 349 if (psa->numints == 0) { 350 int err = zap_remove(mos, zapobj, psa->name, tx); 351 ASSERT(err == 0 || err == ENOENT); 352 if (isint) { 353 VERIFY(0 == dsl_prop_get_impl(dd->dd_parent, 354 psa->name, 8, 1, &intval, NULL)); 355 } 356 } else { 357 VERIFY(0 == zap_update(mos, zapobj, psa->name, 358 psa->intsz, psa->numints, psa->buf, tx)); 359 if (isint) 360 intval = *(uint64_t *)psa->buf; 361 } 362 363 if (isint) { 364 dsl_prop_changed_notify(dd->dd_pool, 365 dd->dd_object, psa->name, intval, TRUE); 366 } 367 if (isint) { 368 (void) snprintf(valbuf, sizeof (valbuf), 369 "%lld", (longlong_t)intval); 370 valstr = valbuf; 371 } else { 372 valstr = (char *)psa->buf; 373 } 374 spa_history_internal_log((psa->numints == 0) ? LOG_DS_INHERIT : 375 LOG_DS_PROPSET, dd->dd_pool->dp_spa, tx, cr, 376 "%s=%s dataset = %llu", psa->name, valstr, 377 dd->dd_phys->dd_head_dataset_obj); 378 } 379 380 void 381 dsl_prop_set_uint64_sync(dsl_dir_t *dd, const char *name, uint64_t val, 382 cred_t *cr, dmu_tx_t *tx) 383 { 384 objset_t *mos = dd->dd_pool->dp_meta_objset; 385 uint64_t zapobj = dd->dd_phys->dd_props_zapobj; 386 387 ASSERT(dmu_tx_is_syncing(tx)); 388 389 VERIFY(0 == zap_update(mos, zapobj, name, sizeof (val), 1, &val, tx)); 390 391 dsl_prop_changed_notify(dd->dd_pool, dd->dd_object, name, val, TRUE); 392 393 spa_history_internal_log(LOG_DS_PROPSET, dd->dd_pool->dp_spa, tx, cr, 394 "%s=%llu dataset = %llu", name, (u_longlong_t)val, 395 dd->dd_phys->dd_head_dataset_obj); 396 } 397 398 int 399 dsl_prop_set_dd(dsl_dir_t *dd, const char *propname, 400 int intsz, int numints, const void *buf) 401 { 402 struct prop_set_arg psa; 403 404 psa.name = propname; 405 psa.intsz = intsz; 406 psa.numints = numints; 407 psa.buf = buf; 408 409 return (dsl_sync_task_do(dd->dd_pool, 410 NULL, dsl_prop_set_sync, dd, &psa, 2)); 411 } 412 413 int 414 dsl_prop_set(const char *ddname, const char *propname, 415 int intsz, int numints, const void *buf) 416 { 417 dsl_dir_t *dd; 418 int err; 419 420 /* 421 * We must do these checks before we get to the syncfunc, since 422 * it can't fail. 423 */ 424 if (strlen(propname) >= ZAP_MAXNAMELEN) 425 return (ENAMETOOLONG); 426 if (intsz * numints >= ZAP_MAXVALUELEN) 427 return (E2BIG); 428 429 err = dsl_dir_open(ddname, FTAG, &dd, NULL); 430 if (err) 431 return (err); 432 err = dsl_prop_set_dd(dd, propname, intsz, numints, buf); 433 dsl_dir_close(dd, FTAG); 434 return (err); 435 } 436 437 /* 438 * Iterate over all properties for this dataset and return them in an nvlist. 439 */ 440 int 441 dsl_prop_get_all(objset_t *os, nvlist_t **nvp) 442 { 443 dsl_dataset_t *ds = os->os->os_dsl_dataset; 444 dsl_dir_t *dd = ds->ds_dir; 445 boolean_t snapshot; 446 int err = 0; 447 dsl_pool_t *dp; 448 objset_t *mos; 449 450 snapshot = dsl_dataset_is_snapshot(ds); 451 452 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0); 453 454 dp = dd->dd_pool; 455 mos = dp->dp_meta_objset; 456 457 rw_enter(&dp->dp_config_rwlock, RW_READER); 458 for (; dd != NULL; dd = dd->dd_parent) { 459 char setpoint[MAXNAMELEN]; 460 zap_cursor_t zc; 461 zap_attribute_t za; 462 463 dsl_dir_name(dd, setpoint); 464 465 for (zap_cursor_init(&zc, mos, dd->dd_phys->dd_props_zapobj); 466 (err = zap_cursor_retrieve(&zc, &za)) == 0; 467 zap_cursor_advance(&zc)) { 468 nvlist_t *propval; 469 zfs_prop_t prop; 470 /* 471 * Skip non-inheritable properties. 472 */ 473 if ((prop = zfs_name_to_prop(za.za_name)) != 474 ZPROP_INVAL && !zfs_prop_inheritable(prop) && 475 dd != ds->ds_dir) 476 continue; 477 478 if (snapshot && 479 !zfs_prop_valid_for_type(prop, ZFS_TYPE_SNAPSHOT)) 480 continue; 481 482 if (nvlist_lookup_nvlist(*nvp, za.za_name, 483 &propval) == 0) 484 continue; 485 486 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, 487 KM_SLEEP) == 0); 488 if (za.za_integer_length == 1) { 489 /* 490 * String property 491 */ 492 char *tmp = kmem_alloc(za.za_num_integers, 493 KM_SLEEP); 494 err = zap_lookup(mos, 495 dd->dd_phys->dd_props_zapobj, 496 za.za_name, 1, za.za_num_integers, 497 tmp); 498 if (err != 0) { 499 kmem_free(tmp, za.za_num_integers); 500 break; 501 } 502 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, 503 tmp) == 0); 504 kmem_free(tmp, za.za_num_integers); 505 } else { 506 /* 507 * Integer property 508 */ 509 ASSERT(za.za_integer_length == 8); 510 (void) nvlist_add_uint64(propval, ZPROP_VALUE, 511 za.za_first_integer); 512 } 513 514 VERIFY(nvlist_add_string(propval, ZPROP_SOURCE, 515 setpoint) == 0); 516 VERIFY(nvlist_add_nvlist(*nvp, za.za_name, 517 propval) == 0); 518 nvlist_free(propval); 519 } 520 zap_cursor_fini(&zc); 521 522 if (err != ENOENT) 523 break; 524 err = 0; 525 } 526 rw_exit(&dp->dp_config_rwlock); 527 528 return (err); 529 } 530 531 void 532 dsl_prop_nvlist_add_uint64(nvlist_t *nv, zfs_prop_t prop, uint64_t value) 533 { 534 nvlist_t *propval; 535 536 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0); 537 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, value) == 0); 538 VERIFY(nvlist_add_nvlist(nv, zfs_prop_to_name(prop), propval) == 0); 539 nvlist_free(propval); 540 } 541 542 void 543 dsl_prop_nvlist_add_string(nvlist_t *nv, zfs_prop_t prop, const char *value) 544 { 545 nvlist_t *propval; 546 547 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0); 548 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, value) == 0); 549 VERIFY(nvlist_add_nvlist(nv, zfs_prop_to_name(prop), propval) == 0); 550 nvlist_free(propval); 551 } 552