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 #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/dsl_deleg.h> 34 #include <sys/spa.h> 35 #include <sys/zap.h> 36 #include <sys/zio.h> 37 #include <sys/arc.h> 38 #include <sys/sunddi.h> 39 #include "zfs_namecheck.h" 40 41 static uint64_t dsl_dir_space_towrite(dsl_dir_t *dd); 42 static void dsl_dir_set_reservation_sync(void *arg1, void *arg2, 43 cred_t *cr, dmu_tx_t *tx); 44 45 46 /* ARGSUSED */ 47 static void 48 dsl_dir_evict(dmu_buf_t *db, void *arg) 49 { 50 dsl_dir_t *dd = arg; 51 dsl_pool_t *dp = dd->dd_pool; 52 int t; 53 54 for (t = 0; t < TXG_SIZE; t++) { 55 ASSERT(!txg_list_member(&dp->dp_dirty_dirs, dd, t)); 56 ASSERT(dd->dd_tempreserved[t] == 0); 57 ASSERT(dd->dd_space_towrite[t] == 0); 58 } 59 60 if (dd->dd_parent) 61 dsl_dir_close(dd->dd_parent, dd); 62 63 spa_close(dd->dd_pool->dp_spa, dd); 64 65 /* 66 * The props callback list should be empty since they hold the 67 * dir open. 68 */ 69 list_destroy(&dd->dd_prop_cbs); 70 mutex_destroy(&dd->dd_lock); 71 kmem_free(dd, sizeof (dsl_dir_t)); 72 } 73 74 int 75 dsl_dir_open_obj(dsl_pool_t *dp, uint64_t ddobj, 76 const char *tail, void *tag, dsl_dir_t **ddp) 77 { 78 dmu_buf_t *dbuf; 79 dsl_dir_t *dd; 80 int err; 81 82 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || 83 dsl_pool_sync_context(dp)); 84 85 err = dmu_bonus_hold(dp->dp_meta_objset, ddobj, tag, &dbuf); 86 if (err) 87 return (err); 88 dd = dmu_buf_get_user(dbuf); 89 #ifdef ZFS_DEBUG 90 { 91 dmu_object_info_t doi; 92 dmu_object_info_from_db(dbuf, &doi); 93 ASSERT3U(doi.doi_type, ==, DMU_OT_DSL_DIR); 94 ASSERT3U(doi.doi_bonus_size, >=, sizeof (dsl_dir_phys_t)); 95 } 96 #endif 97 if (dd == NULL) { 98 dsl_dir_t *winner; 99 int err; 100 101 dd = kmem_zalloc(sizeof (dsl_dir_t), KM_SLEEP); 102 dd->dd_object = ddobj; 103 dd->dd_dbuf = dbuf; 104 dd->dd_pool = dp; 105 dd->dd_phys = dbuf->db_data; 106 mutex_init(&dd->dd_lock, NULL, MUTEX_DEFAULT, NULL); 107 108 list_create(&dd->dd_prop_cbs, sizeof (dsl_prop_cb_record_t), 109 offsetof(dsl_prop_cb_record_t, cbr_node)); 110 111 if (dd->dd_phys->dd_parent_obj) { 112 err = dsl_dir_open_obj(dp, dd->dd_phys->dd_parent_obj, 113 NULL, dd, &dd->dd_parent); 114 if (err) 115 goto errout; 116 if (tail) { 117 #ifdef ZFS_DEBUG 118 uint64_t foundobj; 119 120 err = zap_lookup(dp->dp_meta_objset, 121 dd->dd_parent->dd_phys->dd_child_dir_zapobj, 122 tail, sizeof (foundobj), 1, &foundobj); 123 ASSERT(err || foundobj == ddobj); 124 #endif 125 (void) strcpy(dd->dd_myname, tail); 126 } else { 127 err = zap_value_search(dp->dp_meta_objset, 128 dd->dd_parent->dd_phys->dd_child_dir_zapobj, 129 ddobj, 0, dd->dd_myname); 130 } 131 if (err) 132 goto errout; 133 } else { 134 (void) strcpy(dd->dd_myname, spa_name(dp->dp_spa)); 135 } 136 137 winner = dmu_buf_set_user_ie(dbuf, dd, &dd->dd_phys, 138 dsl_dir_evict); 139 if (winner) { 140 if (dd->dd_parent) 141 dsl_dir_close(dd->dd_parent, dd); 142 mutex_destroy(&dd->dd_lock); 143 kmem_free(dd, sizeof (dsl_dir_t)); 144 dd = winner; 145 } else { 146 spa_open_ref(dp->dp_spa, dd); 147 } 148 } 149 150 /* 151 * The dsl_dir_t has both open-to-close and instantiate-to-evict 152 * holds on the spa. We need the open-to-close holds because 153 * otherwise the spa_refcnt wouldn't change when we open a 154 * dir which the spa also has open, so we could incorrectly 155 * think it was OK to unload/export/destroy the pool. We need 156 * the instantiate-to-evict hold because the dsl_dir_t has a 157 * pointer to the dd_pool, which has a pointer to the spa_t. 158 */ 159 spa_open_ref(dp->dp_spa, tag); 160 ASSERT3P(dd->dd_pool, ==, dp); 161 ASSERT3U(dd->dd_object, ==, ddobj); 162 ASSERT3P(dd->dd_dbuf, ==, dbuf); 163 *ddp = dd; 164 return (0); 165 166 errout: 167 if (dd->dd_parent) 168 dsl_dir_close(dd->dd_parent, dd); 169 mutex_destroy(&dd->dd_lock); 170 kmem_free(dd, sizeof (dsl_dir_t)); 171 dmu_buf_rele(dbuf, tag); 172 return (err); 173 174 } 175 176 void 177 dsl_dir_close(dsl_dir_t *dd, void *tag) 178 { 179 dprintf_dd(dd, "%s\n", ""); 180 spa_close(dd->dd_pool->dp_spa, tag); 181 dmu_buf_rele(dd->dd_dbuf, tag); 182 } 183 184 /* buf must be long enough (MAXNAMELEN + strlen(MOS_DIR_NAME) + 1 should do) */ 185 void 186 dsl_dir_name(dsl_dir_t *dd, char *buf) 187 { 188 if (dd->dd_parent) { 189 dsl_dir_name(dd->dd_parent, buf); 190 (void) strcat(buf, "/"); 191 } else { 192 buf[0] = '\0'; 193 } 194 if (!MUTEX_HELD(&dd->dd_lock)) { 195 /* 196 * recursive mutex so that we can use 197 * dprintf_dd() with dd_lock held 198 */ 199 mutex_enter(&dd->dd_lock); 200 (void) strcat(buf, dd->dd_myname); 201 mutex_exit(&dd->dd_lock); 202 } else { 203 (void) strcat(buf, dd->dd_myname); 204 } 205 } 206 207 /* Calculate name legnth, avoiding all the strcat calls of dsl_dir_name */ 208 int 209 dsl_dir_namelen(dsl_dir_t *dd) 210 { 211 int result = 0; 212 213 if (dd->dd_parent) { 214 /* parent's name + 1 for the "/" */ 215 result = dsl_dir_namelen(dd->dd_parent) + 1; 216 } 217 218 if (!MUTEX_HELD(&dd->dd_lock)) { 219 /* see dsl_dir_name */ 220 mutex_enter(&dd->dd_lock); 221 result += strlen(dd->dd_myname); 222 mutex_exit(&dd->dd_lock); 223 } else { 224 result += strlen(dd->dd_myname); 225 } 226 227 return (result); 228 } 229 230 int 231 dsl_dir_is_private(dsl_dir_t *dd) 232 { 233 int rv = FALSE; 234 235 if (dd->dd_parent && dsl_dir_is_private(dd->dd_parent)) 236 rv = TRUE; 237 if (dataset_name_hidden(dd->dd_myname)) 238 rv = TRUE; 239 return (rv); 240 } 241 242 243 static int 244 getcomponent(const char *path, char *component, const char **nextp) 245 { 246 char *p; 247 if (path == NULL) 248 return (ENOENT); 249 /* This would be a good place to reserve some namespace... */ 250 p = strpbrk(path, "/@"); 251 if (p && (p[1] == '/' || p[1] == '@')) { 252 /* two separators in a row */ 253 return (EINVAL); 254 } 255 if (p == NULL || p == path) { 256 /* 257 * if the first thing is an @ or /, it had better be an 258 * @ and it had better not have any more ats or slashes, 259 * and it had better have something after the @. 260 */ 261 if (p != NULL && 262 (p[0] != '@' || strpbrk(path+1, "/@") || p[1] == '\0')) 263 return (EINVAL); 264 if (strlen(path) >= MAXNAMELEN) 265 return (ENAMETOOLONG); 266 (void) strcpy(component, path); 267 p = NULL; 268 } else if (p[0] == '/') { 269 if (p-path >= MAXNAMELEN) 270 return (ENAMETOOLONG); 271 (void) strncpy(component, path, p - path); 272 component[p-path] = '\0'; 273 p++; 274 } else if (p[0] == '@') { 275 /* 276 * if the next separator is an @, there better not be 277 * any more slashes. 278 */ 279 if (strchr(path, '/')) 280 return (EINVAL); 281 if (p-path >= MAXNAMELEN) 282 return (ENAMETOOLONG); 283 (void) strncpy(component, path, p - path); 284 component[p-path] = '\0'; 285 } else { 286 ASSERT(!"invalid p"); 287 } 288 *nextp = p; 289 return (0); 290 } 291 292 /* 293 * same as dsl_open_dir, ignore the first component of name and use the 294 * spa instead 295 */ 296 int 297 dsl_dir_open_spa(spa_t *spa, const char *name, void *tag, 298 dsl_dir_t **ddp, const char **tailp) 299 { 300 char buf[MAXNAMELEN]; 301 const char *next, *nextnext = NULL; 302 int err; 303 dsl_dir_t *dd; 304 dsl_pool_t *dp; 305 uint64_t ddobj; 306 int openedspa = FALSE; 307 308 dprintf("%s\n", name); 309 310 err = getcomponent(name, buf, &next); 311 if (err) 312 return (err); 313 if (spa == NULL) { 314 err = spa_open(buf, &spa, FTAG); 315 if (err) { 316 dprintf("spa_open(%s) failed\n", buf); 317 return (err); 318 } 319 openedspa = TRUE; 320 321 /* XXX this assertion belongs in spa_open */ 322 ASSERT(!dsl_pool_sync_context(spa_get_dsl(spa))); 323 } 324 325 dp = spa_get_dsl(spa); 326 327 rw_enter(&dp->dp_config_rwlock, RW_READER); 328 err = dsl_dir_open_obj(dp, dp->dp_root_dir_obj, NULL, tag, &dd); 329 if (err) { 330 rw_exit(&dp->dp_config_rwlock); 331 if (openedspa) 332 spa_close(spa, FTAG); 333 return (err); 334 } 335 336 while (next != NULL) { 337 dsl_dir_t *child_ds; 338 err = getcomponent(next, buf, &nextnext); 339 if (err) 340 break; 341 ASSERT(next[0] != '\0'); 342 if (next[0] == '@') 343 break; 344 dprintf("looking up %s in obj%lld\n", 345 buf, dd->dd_phys->dd_child_dir_zapobj); 346 347 err = zap_lookup(dp->dp_meta_objset, 348 dd->dd_phys->dd_child_dir_zapobj, 349 buf, sizeof (ddobj), 1, &ddobj); 350 if (err) { 351 if (err == ENOENT) 352 err = 0; 353 break; 354 } 355 356 err = dsl_dir_open_obj(dp, ddobj, buf, tag, &child_ds); 357 if (err) 358 break; 359 dsl_dir_close(dd, tag); 360 dd = child_ds; 361 next = nextnext; 362 } 363 rw_exit(&dp->dp_config_rwlock); 364 365 if (err) { 366 dsl_dir_close(dd, tag); 367 if (openedspa) 368 spa_close(spa, FTAG); 369 return (err); 370 } 371 372 /* 373 * It's an error if there's more than one component left, or 374 * tailp==NULL and there's any component left. 375 */ 376 if (next != NULL && 377 (tailp == NULL || (nextnext && nextnext[0] != '\0'))) { 378 /* bad path name */ 379 dsl_dir_close(dd, tag); 380 dprintf("next=%p (%s) tail=%p\n", next, next?next:"", tailp); 381 err = ENOENT; 382 } 383 if (tailp) 384 *tailp = next; 385 if (openedspa) 386 spa_close(spa, FTAG); 387 *ddp = dd; 388 return (err); 389 } 390 391 /* 392 * Return the dsl_dir_t, and possibly the last component which couldn't 393 * be found in *tail. Return NULL if the path is bogus, or if 394 * tail==NULL and we couldn't parse the whole name. (*tail)[0] == '@' 395 * means that the last component is a snapshot. 396 */ 397 int 398 dsl_dir_open(const char *name, void *tag, dsl_dir_t **ddp, const char **tailp) 399 { 400 return (dsl_dir_open_spa(NULL, name, tag, ddp, tailp)); 401 } 402 403 uint64_t 404 dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds, const char *name, 405 dmu_tx_t *tx) 406 { 407 objset_t *mos = dp->dp_meta_objset; 408 uint64_t ddobj; 409 dsl_dir_phys_t *dsphys; 410 dmu_buf_t *dbuf; 411 412 ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0, 413 DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx); 414 if (pds) { 415 VERIFY(0 == zap_add(mos, pds->dd_phys->dd_child_dir_zapobj, 416 name, sizeof (uint64_t), 1, &ddobj, tx)); 417 } else { 418 /* it's the root dir */ 419 VERIFY(0 == zap_add(mos, DMU_POOL_DIRECTORY_OBJECT, 420 DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, &ddobj, tx)); 421 } 422 VERIFY(0 == dmu_bonus_hold(mos, ddobj, FTAG, &dbuf)); 423 dmu_buf_will_dirty(dbuf, tx); 424 dsphys = dbuf->db_data; 425 426 dsphys->dd_creation_time = gethrestime_sec(); 427 if (pds) 428 dsphys->dd_parent_obj = pds->dd_object; 429 dsphys->dd_props_zapobj = zap_create(mos, 430 DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx); 431 dsphys->dd_child_dir_zapobj = zap_create(mos, 432 DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx); 433 if (spa_version(dp->dp_spa) >= SPA_VERSION_USED_BREAKDOWN) 434 dsphys->dd_flags |= DD_FLAG_USED_BREAKDOWN; 435 dmu_buf_rele(dbuf, FTAG); 436 437 return (ddobj); 438 } 439 440 /* ARGSUSED */ 441 int 442 dsl_dir_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) 443 { 444 dsl_dir_t *dd = arg1; 445 dsl_pool_t *dp = dd->dd_pool; 446 objset_t *mos = dp->dp_meta_objset; 447 int err; 448 uint64_t count; 449 450 /* 451 * There should be exactly two holds, both from 452 * dsl_dataset_destroy: one on the dd directory, and one on its 453 * head ds. Otherwise, someone is trying to lookup something 454 * inside this dir while we want to destroy it. The 455 * config_rwlock ensures that nobody else opens it after we 456 * check. 457 */ 458 if (dmu_buf_refcount(dd->dd_dbuf) > 2) 459 return (EBUSY); 460 461 err = zap_count(mos, dd->dd_phys->dd_child_dir_zapobj, &count); 462 if (err) 463 return (err); 464 if (count != 0) 465 return (EEXIST); 466 467 return (0); 468 } 469 470 void 471 dsl_dir_destroy_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx) 472 { 473 dsl_dir_t *dd = arg1; 474 objset_t *mos = dd->dd_pool->dp_meta_objset; 475 uint64_t val, obj; 476 dd_used_t t; 477 478 ASSERT(RW_WRITE_HELD(&dd->dd_pool->dp_config_rwlock)); 479 ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); 480 481 /* Remove our reservation. */ 482 val = 0; 483 dsl_dir_set_reservation_sync(dd, &val, cr, tx); 484 ASSERT3U(dd->dd_phys->dd_used_bytes, ==, 0); 485 ASSERT3U(dd->dd_phys->dd_reserved, ==, 0); 486 for (t = 0; t < DD_USED_NUM; t++) 487 ASSERT3U(dd->dd_phys->dd_used_breakdown[t], ==, 0); 488 489 VERIFY(0 == zap_destroy(mos, dd->dd_phys->dd_child_dir_zapobj, tx)); 490 VERIFY(0 == zap_destroy(mos, dd->dd_phys->dd_props_zapobj, tx)); 491 VERIFY(0 == dsl_deleg_destroy(mos, dd->dd_phys->dd_deleg_zapobj, tx)); 492 VERIFY(0 == zap_remove(mos, 493 dd->dd_parent->dd_phys->dd_child_dir_zapobj, dd->dd_myname, tx)); 494 495 obj = dd->dd_object; 496 dsl_dir_close(dd, tag); 497 VERIFY(0 == dmu_object_free(mos, obj, tx)); 498 } 499 500 boolean_t 501 dsl_dir_is_clone(dsl_dir_t *dd) 502 { 503 return (dd->dd_phys->dd_origin_obj && 504 (dd->dd_pool->dp_origin_snap == NULL || 505 dd->dd_phys->dd_origin_obj != 506 dd->dd_pool->dp_origin_snap->ds_object)); 507 } 508 509 void 510 dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv) 511 { 512 mutex_enter(&dd->dd_lock); 513 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 514 dd->dd_phys->dd_used_bytes); 515 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_QUOTA, dd->dd_phys->dd_quota); 516 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_RESERVATION, 517 dd->dd_phys->dd_reserved); 518 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 519 dd->dd_phys->dd_compressed_bytes == 0 ? 100 : 520 (dd->dd_phys->dd_uncompressed_bytes * 100 / 521 dd->dd_phys->dd_compressed_bytes)); 522 if (dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 523 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDSNAP, 524 dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]); 525 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDDS, 526 dd->dd_phys->dd_used_breakdown[DD_USED_HEAD]); 527 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDREFRESERV, 528 dd->dd_phys->dd_used_breakdown[DD_USED_REFRSRV]); 529 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDCHILD, 530 dd->dd_phys->dd_used_breakdown[DD_USED_CHILD] + 531 dd->dd_phys->dd_used_breakdown[DD_USED_CHILD_RSRV]); 532 } 533 mutex_exit(&dd->dd_lock); 534 535 rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER); 536 if (dsl_dir_is_clone(dd)) { 537 dsl_dataset_t *ds; 538 char buf[MAXNAMELEN]; 539 540 VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, 541 dd->dd_phys->dd_origin_obj, FTAG, &ds)); 542 dsl_dataset_name(ds, buf); 543 dsl_dataset_rele(ds, FTAG); 544 dsl_prop_nvlist_add_string(nv, ZFS_PROP_ORIGIN, buf); 545 } 546 rw_exit(&dd->dd_pool->dp_config_rwlock); 547 } 548 549 void 550 dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx) 551 { 552 dsl_pool_t *dp = dd->dd_pool; 553 554 ASSERT(dd->dd_phys); 555 556 if (txg_list_add(&dp->dp_dirty_dirs, dd, tx->tx_txg) == 0) { 557 /* up the hold count until we can be written out */ 558 dmu_buf_add_ref(dd->dd_dbuf, dd); 559 } 560 } 561 562 static int64_t 563 parent_delta(dsl_dir_t *dd, uint64_t used, int64_t delta) 564 { 565 uint64_t old_accounted = MAX(used, dd->dd_phys->dd_reserved); 566 uint64_t new_accounted = MAX(used + delta, dd->dd_phys->dd_reserved); 567 return (new_accounted - old_accounted); 568 } 569 570 void 571 dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx) 572 { 573 ASSERT(dmu_tx_is_syncing(tx)); 574 575 dmu_buf_will_dirty(dd->dd_dbuf, tx); 576 577 mutex_enter(&dd->dd_lock); 578 ASSERT3U(dd->dd_tempreserved[tx->tx_txg&TXG_MASK], ==, 0); 579 dprintf_dd(dd, "txg=%llu towrite=%lluK\n", tx->tx_txg, 580 dd->dd_space_towrite[tx->tx_txg&TXG_MASK] / 1024); 581 dd->dd_space_towrite[tx->tx_txg&TXG_MASK] = 0; 582 mutex_exit(&dd->dd_lock); 583 584 /* release the hold from dsl_dir_dirty */ 585 dmu_buf_rele(dd->dd_dbuf, dd); 586 } 587 588 static uint64_t 589 dsl_dir_space_towrite(dsl_dir_t *dd) 590 { 591 uint64_t space = 0; 592 int i; 593 594 ASSERT(MUTEX_HELD(&dd->dd_lock)); 595 596 for (i = 0; i < TXG_SIZE; i++) { 597 space += dd->dd_space_towrite[i&TXG_MASK]; 598 ASSERT3U(dd->dd_space_towrite[i&TXG_MASK], >=, 0); 599 } 600 return (space); 601 } 602 603 /* 604 * How much space would dd have available if ancestor had delta applied 605 * to it? If ondiskonly is set, we're only interested in what's 606 * on-disk, not estimated pending changes. 607 */ 608 uint64_t 609 dsl_dir_space_available(dsl_dir_t *dd, 610 dsl_dir_t *ancestor, int64_t delta, int ondiskonly) 611 { 612 uint64_t parentspace, myspace, quota, used; 613 614 /* 615 * If there are no restrictions otherwise, assume we have 616 * unlimited space available. 617 */ 618 quota = UINT64_MAX; 619 parentspace = UINT64_MAX; 620 621 if (dd->dd_parent != NULL) { 622 parentspace = dsl_dir_space_available(dd->dd_parent, 623 ancestor, delta, ondiskonly); 624 } 625 626 mutex_enter(&dd->dd_lock); 627 if (dd->dd_phys->dd_quota != 0) 628 quota = dd->dd_phys->dd_quota; 629 used = dd->dd_phys->dd_used_bytes; 630 if (!ondiskonly) 631 used += dsl_dir_space_towrite(dd); 632 633 if (dd->dd_parent == NULL) { 634 uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, FALSE); 635 quota = MIN(quota, poolsize); 636 } 637 638 if (dd->dd_phys->dd_reserved > used && parentspace != UINT64_MAX) { 639 /* 640 * We have some space reserved, in addition to what our 641 * parent gave us. 642 */ 643 parentspace += dd->dd_phys->dd_reserved - used; 644 } 645 646 if (dd == ancestor) { 647 ASSERT(delta <= 0); 648 ASSERT(used >= -delta); 649 used += delta; 650 if (parentspace != UINT64_MAX) 651 parentspace -= delta; 652 } 653 654 if (used > quota) { 655 /* over quota */ 656 myspace = 0; 657 658 /* 659 * While it's OK to be a little over quota, if 660 * we think we are using more space than there 661 * is in the pool (which is already 1.6% more than 662 * dsl_pool_adjustedsize()), something is very 663 * wrong. 664 */ 665 ASSERT3U(used, <=, spa_get_space(dd->dd_pool->dp_spa)); 666 } else { 667 /* 668 * the lesser of the space provided by our parent and 669 * the space left in our quota 670 */ 671 myspace = MIN(parentspace, quota - used); 672 } 673 674 mutex_exit(&dd->dd_lock); 675 676 return (myspace); 677 } 678 679 struct tempreserve { 680 list_node_t tr_node; 681 dsl_pool_t *tr_dp; 682 dsl_dir_t *tr_ds; 683 uint64_t tr_size; 684 }; 685 686 static int 687 dsl_dir_tempreserve_impl(dsl_dir_t *dd, uint64_t asize, boolean_t netfree, 688 boolean_t ignorequota, boolean_t checkrefquota, list_t *tr_list, 689 dmu_tx_t *tx, boolean_t first) 690 { 691 uint64_t txg = tx->tx_txg; 692 uint64_t est_inflight, used_on_disk, quota, parent_rsrv; 693 struct tempreserve *tr; 694 int enospc = EDQUOT; 695 int txgidx = txg & TXG_MASK; 696 int i; 697 uint64_t ref_rsrv = 0; 698 699 ASSERT3U(txg, !=, 0); 700 ASSERT3S(asize, >, 0); 701 702 mutex_enter(&dd->dd_lock); 703 704 /* 705 * Check against the dsl_dir's quota. We don't add in the delta 706 * when checking for over-quota because they get one free hit. 707 */ 708 est_inflight = dsl_dir_space_towrite(dd); 709 for (i = 0; i < TXG_SIZE; i++) 710 est_inflight += dd->dd_tempreserved[i]; 711 used_on_disk = dd->dd_phys->dd_used_bytes; 712 713 /* 714 * On the first iteration, fetch the dataset's used-on-disk and 715 * refreservation values. Also, if checkrefquota is set, test if 716 * allocating this space would exceed the dataset's refquota. 717 */ 718 if (first && tx->tx_objset) { 719 int error; 720 dsl_dataset_t *ds = tx->tx_objset->os->os_dsl_dataset; 721 722 error = dsl_dataset_check_quota(ds, checkrefquota, 723 asize, est_inflight, &used_on_disk, &ref_rsrv); 724 if (error) { 725 mutex_exit(&dd->dd_lock); 726 return (error); 727 } 728 } 729 730 /* 731 * If this transaction will result in a net free of space, 732 * we want to let it through. 733 */ 734 if (ignorequota || netfree || dd->dd_phys->dd_quota == 0) 735 quota = UINT64_MAX; 736 else 737 quota = dd->dd_phys->dd_quota; 738 739 /* 740 * Adjust the quota against the actual pool size at the root. 741 * To ensure that it's possible to remove files from a full 742 * pool without inducing transient overcommits, we throttle 743 * netfree transactions against a quota that is slightly larger, 744 * but still within the pool's allocation slop. In cases where 745 * we're very close to full, this will allow a steady trickle of 746 * removes to get through. 747 */ 748 if (dd->dd_parent == NULL) { 749 uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, netfree); 750 if (poolsize < quota) { 751 quota = poolsize; 752 enospc = ENOSPC; 753 } 754 } 755 756 /* 757 * If they are requesting more space, and our current estimate 758 * is over quota, they get to try again unless the actual 759 * on-disk is over quota and there are no pending changes (which 760 * may free up space for us). 761 */ 762 if (used_on_disk + est_inflight > quota) { 763 if (est_inflight > 0 || used_on_disk < quota) 764 enospc = ERESTART; 765 dprintf_dd(dd, "failing: used=%lluK inflight = %lluK " 766 "quota=%lluK tr=%lluK err=%d\n", 767 used_on_disk>>10, est_inflight>>10, 768 quota>>10, asize>>10, enospc); 769 mutex_exit(&dd->dd_lock); 770 return (enospc); 771 } 772 773 /* We need to up our estimated delta before dropping dd_lock */ 774 dd->dd_tempreserved[txgidx] += asize; 775 776 parent_rsrv = parent_delta(dd, used_on_disk + est_inflight, 777 asize - ref_rsrv); 778 mutex_exit(&dd->dd_lock); 779 780 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP); 781 tr->tr_ds = dd; 782 tr->tr_size = asize; 783 list_insert_tail(tr_list, tr); 784 785 /* see if it's OK with our parent */ 786 if (dd->dd_parent && parent_rsrv) { 787 boolean_t ismos = (dd->dd_phys->dd_head_dataset_obj == 0); 788 789 return (dsl_dir_tempreserve_impl(dd->dd_parent, 790 parent_rsrv, netfree, ismos, TRUE, tr_list, tx, FALSE)); 791 } else { 792 return (0); 793 } 794 } 795 796 /* 797 * Reserve space in this dsl_dir, to be used in this tx's txg. 798 * After the space has been dirtied (and dsl_dir_willuse_space() 799 * has been called), the reservation should be canceled, using 800 * dsl_dir_tempreserve_clear(). 801 */ 802 int 803 dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize, uint64_t asize, 804 uint64_t fsize, uint64_t usize, void **tr_cookiep, dmu_tx_t *tx) 805 { 806 int err; 807 list_t *tr_list; 808 809 if (asize == 0) { 810 *tr_cookiep = NULL; 811 return (0); 812 } 813 814 tr_list = kmem_alloc(sizeof (list_t), KM_SLEEP); 815 list_create(tr_list, sizeof (struct tempreserve), 816 offsetof(struct tempreserve, tr_node)); 817 ASSERT3S(asize, >, 0); 818 ASSERT3S(fsize, >=, 0); 819 820 err = arc_tempreserve_space(lsize, tx->tx_txg); 821 if (err == 0) { 822 struct tempreserve *tr; 823 824 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP); 825 tr->tr_size = lsize; 826 list_insert_tail(tr_list, tr); 827 828 err = dsl_pool_tempreserve_space(dd->dd_pool, asize, tx); 829 } else { 830 if (err == EAGAIN) { 831 txg_delay(dd->dd_pool, tx->tx_txg, 1); 832 err = ERESTART; 833 } 834 dsl_pool_memory_pressure(dd->dd_pool); 835 } 836 837 if (err == 0) { 838 struct tempreserve *tr; 839 840 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP); 841 tr->tr_dp = dd->dd_pool; 842 tr->tr_size = asize; 843 list_insert_tail(tr_list, tr); 844 845 err = dsl_dir_tempreserve_impl(dd, asize, fsize >= asize, 846 FALSE, asize > usize, tr_list, tx, TRUE); 847 } 848 849 if (err) 850 dsl_dir_tempreserve_clear(tr_list, tx); 851 else 852 *tr_cookiep = tr_list; 853 854 return (err); 855 } 856 857 /* 858 * Clear a temporary reservation that we previously made with 859 * dsl_dir_tempreserve_space(). 860 */ 861 void 862 dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx) 863 { 864 int txgidx = tx->tx_txg & TXG_MASK; 865 list_t *tr_list = tr_cookie; 866 struct tempreserve *tr; 867 868 ASSERT3U(tx->tx_txg, !=, 0); 869 870 if (tr_cookie == NULL) 871 return; 872 873 while (tr = list_head(tr_list)) { 874 if (tr->tr_dp) { 875 dsl_pool_tempreserve_clear(tr->tr_dp, tr->tr_size, tx); 876 } else if (tr->tr_ds) { 877 mutex_enter(&tr->tr_ds->dd_lock); 878 ASSERT3U(tr->tr_ds->dd_tempreserved[txgidx], >=, 879 tr->tr_size); 880 tr->tr_ds->dd_tempreserved[txgidx] -= tr->tr_size; 881 mutex_exit(&tr->tr_ds->dd_lock); 882 } else { 883 arc_tempreserve_clear(tr->tr_size); 884 } 885 list_remove(tr_list, tr); 886 kmem_free(tr, sizeof (struct tempreserve)); 887 } 888 889 kmem_free(tr_list, sizeof (list_t)); 890 } 891 892 static void 893 dsl_dir_willuse_space_impl(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx) 894 { 895 int64_t parent_space; 896 uint64_t est_used; 897 898 mutex_enter(&dd->dd_lock); 899 if (space > 0) 900 dd->dd_space_towrite[tx->tx_txg & TXG_MASK] += space; 901 902 est_used = dsl_dir_space_towrite(dd) + dd->dd_phys->dd_used_bytes; 903 parent_space = parent_delta(dd, est_used, space); 904 mutex_exit(&dd->dd_lock); 905 906 /* Make sure that we clean up dd_space_to* */ 907 dsl_dir_dirty(dd, tx); 908 909 /* XXX this is potentially expensive and unnecessary... */ 910 if (parent_space && dd->dd_parent) 911 dsl_dir_willuse_space_impl(dd->dd_parent, parent_space, tx); 912 } 913 914 /* 915 * Call in open context when we think we're going to write/free space, 916 * eg. when dirtying data. Be conservative (ie. OK to write less than 917 * this or free more than this, but don't write more or free less). 918 */ 919 void 920 dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx) 921 { 922 dsl_pool_willuse_space(dd->dd_pool, space, tx); 923 dsl_dir_willuse_space_impl(dd, space, tx); 924 } 925 926 /* call from syncing context when we actually write/free space for this dd */ 927 void 928 dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type, 929 int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx) 930 { 931 int64_t accounted_delta; 932 933 ASSERT(dmu_tx_is_syncing(tx)); 934 ASSERT(type < DD_USED_NUM); 935 936 dsl_dir_dirty(dd, tx); 937 938 mutex_enter(&dd->dd_lock); 939 accounted_delta = parent_delta(dd, dd->dd_phys->dd_used_bytes, used); 940 ASSERT(used >= 0 || dd->dd_phys->dd_used_bytes >= -used); 941 ASSERT(compressed >= 0 || 942 dd->dd_phys->dd_compressed_bytes >= -compressed); 943 ASSERT(uncompressed >= 0 || 944 dd->dd_phys->dd_uncompressed_bytes >= -uncompressed); 945 dd->dd_phys->dd_used_bytes += used; 946 dd->dd_phys->dd_uncompressed_bytes += uncompressed; 947 dd->dd_phys->dd_compressed_bytes += compressed; 948 949 if (dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 950 ASSERT(used > 0 || 951 dd->dd_phys->dd_used_breakdown[type] >= -used); 952 dd->dd_phys->dd_used_breakdown[type] += used; 953 #ifdef DEBUG 954 dd_used_t t; 955 uint64_t u = 0; 956 for (t = 0; t < DD_USED_NUM; t++) 957 u += dd->dd_phys->dd_used_breakdown[t]; 958 ASSERT3U(u, ==, dd->dd_phys->dd_used_bytes); 959 #endif 960 } 961 mutex_exit(&dd->dd_lock); 962 963 if (dd->dd_parent != NULL) { 964 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD, 965 accounted_delta, compressed, uncompressed, tx); 966 dsl_dir_transfer_space(dd->dd_parent, 967 used - accounted_delta, 968 DD_USED_CHILD_RSRV, DD_USED_CHILD, tx); 969 } 970 } 971 972 void 973 dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta, 974 dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx) 975 { 976 ASSERT(dmu_tx_is_syncing(tx)); 977 ASSERT(oldtype < DD_USED_NUM); 978 ASSERT(newtype < DD_USED_NUM); 979 980 if (delta == 0 || !(dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN)) 981 return; 982 983 dsl_dir_dirty(dd, tx); 984 mutex_enter(&dd->dd_lock); 985 ASSERT(delta > 0 ? 986 dd->dd_phys->dd_used_breakdown[oldtype] >= delta : 987 dd->dd_phys->dd_used_breakdown[newtype] >= -delta); 988 ASSERT(dd->dd_phys->dd_used_bytes >= ABS(delta)); 989 dd->dd_phys->dd_used_breakdown[oldtype] -= delta; 990 dd->dd_phys->dd_used_breakdown[newtype] += delta; 991 mutex_exit(&dd->dd_lock); 992 } 993 994 995 static int 996 dsl_dir_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx) 997 { 998 dsl_dir_t *dd = arg1; 999 uint64_t *quotap = arg2; 1000 uint64_t new_quota = *quotap; 1001 int err = 0; 1002 uint64_t towrite; 1003 1004 if (new_quota == 0) 1005 return (0); 1006 1007 mutex_enter(&dd->dd_lock); 1008 /* 1009 * If we are doing the preliminary check in open context, and 1010 * there are pending changes, then don't fail it, since the 1011 * pending changes could under-estimate the amount of space to be 1012 * freed up. 1013 */ 1014 towrite = dsl_dir_space_towrite(dd); 1015 if ((dmu_tx_is_syncing(tx) || towrite == 0) && 1016 (new_quota < dd->dd_phys->dd_reserved || 1017 new_quota < dd->dd_phys->dd_used_bytes + towrite)) { 1018 err = ENOSPC; 1019 } 1020 mutex_exit(&dd->dd_lock); 1021 return (err); 1022 } 1023 1024 /* ARGSUSED */ 1025 static void 1026 dsl_dir_set_quota_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1027 { 1028 dsl_dir_t *dd = arg1; 1029 uint64_t *quotap = arg2; 1030 uint64_t new_quota = *quotap; 1031 1032 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1033 1034 mutex_enter(&dd->dd_lock); 1035 dd->dd_phys->dd_quota = new_quota; 1036 mutex_exit(&dd->dd_lock); 1037 1038 spa_history_internal_log(LOG_DS_QUOTA, dd->dd_pool->dp_spa, 1039 tx, cr, "%lld dataset = %llu ", 1040 (longlong_t)new_quota, dd->dd_phys->dd_head_dataset_obj); 1041 } 1042 1043 int 1044 dsl_dir_set_quota(const char *ddname, uint64_t quota) 1045 { 1046 dsl_dir_t *dd; 1047 int err; 1048 1049 err = dsl_dir_open(ddname, FTAG, &dd, NULL); 1050 if (err) 1051 return (err); 1052 1053 if (quota != dd->dd_phys->dd_quota) { 1054 /* 1055 * If someone removes a file, then tries to set the quota, we 1056 * want to make sure the file freeing takes effect. 1057 */ 1058 txg_wait_open(dd->dd_pool, 0); 1059 1060 err = dsl_sync_task_do(dd->dd_pool, dsl_dir_set_quota_check, 1061 dsl_dir_set_quota_sync, dd, "a, 0); 1062 } 1063 dsl_dir_close(dd, FTAG); 1064 return (err); 1065 } 1066 1067 int 1068 dsl_dir_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx) 1069 { 1070 dsl_dir_t *dd = arg1; 1071 uint64_t *reservationp = arg2; 1072 uint64_t new_reservation = *reservationp; 1073 uint64_t used, avail; 1074 int64_t delta; 1075 1076 if (new_reservation > INT64_MAX) 1077 return (EOVERFLOW); 1078 1079 /* 1080 * If we are doing the preliminary check in open context, the 1081 * space estimates may be inaccurate. 1082 */ 1083 if (!dmu_tx_is_syncing(tx)) 1084 return (0); 1085 1086 mutex_enter(&dd->dd_lock); 1087 used = dd->dd_phys->dd_used_bytes; 1088 delta = MAX(used, new_reservation) - 1089 MAX(used, dd->dd_phys->dd_reserved); 1090 mutex_exit(&dd->dd_lock); 1091 1092 if (dd->dd_parent) { 1093 avail = dsl_dir_space_available(dd->dd_parent, 1094 NULL, 0, FALSE); 1095 } else { 1096 avail = dsl_pool_adjustedsize(dd->dd_pool, B_FALSE) - used; 1097 } 1098 1099 if (delta > 0 && delta > avail) 1100 return (ENOSPC); 1101 if (delta > 0 && dd->dd_phys->dd_quota > 0 && 1102 new_reservation > dd->dd_phys->dd_quota) 1103 return (ENOSPC); 1104 return (0); 1105 } 1106 1107 /* ARGSUSED */ 1108 static void 1109 dsl_dir_set_reservation_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1110 { 1111 dsl_dir_t *dd = arg1; 1112 uint64_t *reservationp = arg2; 1113 uint64_t new_reservation = *reservationp; 1114 uint64_t used; 1115 int64_t delta; 1116 1117 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1118 1119 mutex_enter(&dd->dd_lock); 1120 used = dd->dd_phys->dd_used_bytes; 1121 delta = MAX(used, new_reservation) - 1122 MAX(used, dd->dd_phys->dd_reserved); 1123 dd->dd_phys->dd_reserved = new_reservation; 1124 mutex_exit(&dd->dd_lock); 1125 1126 if (dd->dd_parent != NULL) { 1127 /* Roll up this additional usage into our ancestors */ 1128 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV, 1129 delta, 0, 0, tx); 1130 } 1131 1132 spa_history_internal_log(LOG_DS_RESERVATION, dd->dd_pool->dp_spa, 1133 tx, cr, "%lld dataset = %llu", 1134 (longlong_t)new_reservation, dd->dd_phys->dd_head_dataset_obj); 1135 } 1136 1137 int 1138 dsl_dir_set_reservation(const char *ddname, uint64_t reservation) 1139 { 1140 dsl_dir_t *dd; 1141 int err; 1142 1143 err = dsl_dir_open(ddname, FTAG, &dd, NULL); 1144 if (err) 1145 return (err); 1146 err = dsl_sync_task_do(dd->dd_pool, dsl_dir_set_reservation_check, 1147 dsl_dir_set_reservation_sync, dd, &reservation, 0); 1148 dsl_dir_close(dd, FTAG); 1149 return (err); 1150 } 1151 1152 static dsl_dir_t * 1153 closest_common_ancestor(dsl_dir_t *ds1, dsl_dir_t *ds2) 1154 { 1155 for (; ds1; ds1 = ds1->dd_parent) { 1156 dsl_dir_t *dd; 1157 for (dd = ds2; dd; dd = dd->dd_parent) { 1158 if (ds1 == dd) 1159 return (dd); 1160 } 1161 } 1162 return (NULL); 1163 } 1164 1165 /* 1166 * If delta is applied to dd, how much of that delta would be applied to 1167 * ancestor? Syncing context only. 1168 */ 1169 static int64_t 1170 would_change(dsl_dir_t *dd, int64_t delta, dsl_dir_t *ancestor) 1171 { 1172 if (dd == ancestor) 1173 return (delta); 1174 1175 mutex_enter(&dd->dd_lock); 1176 delta = parent_delta(dd, dd->dd_phys->dd_used_bytes, delta); 1177 mutex_exit(&dd->dd_lock); 1178 return (would_change(dd->dd_parent, delta, ancestor)); 1179 } 1180 1181 struct renamearg { 1182 dsl_dir_t *newparent; 1183 const char *mynewname; 1184 }; 1185 1186 /*ARGSUSED*/ 1187 static int 1188 dsl_dir_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) 1189 { 1190 dsl_dir_t *dd = arg1; 1191 struct renamearg *ra = arg2; 1192 dsl_pool_t *dp = dd->dd_pool; 1193 objset_t *mos = dp->dp_meta_objset; 1194 int err; 1195 uint64_t val; 1196 1197 /* There should be 2 references: the open and the dirty */ 1198 if (dmu_buf_refcount(dd->dd_dbuf) > 2) 1199 return (EBUSY); 1200 1201 /* check for existing name */ 1202 err = zap_lookup(mos, ra->newparent->dd_phys->dd_child_dir_zapobj, 1203 ra->mynewname, 8, 1, &val); 1204 if (err == 0) 1205 return (EEXIST); 1206 if (err != ENOENT) 1207 return (err); 1208 1209 if (ra->newparent != dd->dd_parent) { 1210 /* is there enough space? */ 1211 uint64_t myspace = 1212 MAX(dd->dd_phys->dd_used_bytes, dd->dd_phys->dd_reserved); 1213 1214 /* no rename into our descendant */ 1215 if (closest_common_ancestor(dd, ra->newparent) == dd) 1216 return (EINVAL); 1217 1218 if (err = dsl_dir_transfer_possible(dd->dd_parent, 1219 ra->newparent, myspace)) 1220 return (err); 1221 } 1222 1223 return (0); 1224 } 1225 1226 static void 1227 dsl_dir_rename_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1228 { 1229 dsl_dir_t *dd = arg1; 1230 struct renamearg *ra = arg2; 1231 dsl_pool_t *dp = dd->dd_pool; 1232 objset_t *mos = dp->dp_meta_objset; 1233 int err; 1234 1235 ASSERT(dmu_buf_refcount(dd->dd_dbuf) <= 2); 1236 1237 if (ra->newparent != dd->dd_parent) { 1238 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD, 1239 -dd->dd_phys->dd_used_bytes, 1240 -dd->dd_phys->dd_compressed_bytes, 1241 -dd->dd_phys->dd_uncompressed_bytes, tx); 1242 dsl_dir_diduse_space(ra->newparent, DD_USED_CHILD, 1243 dd->dd_phys->dd_used_bytes, 1244 dd->dd_phys->dd_compressed_bytes, 1245 dd->dd_phys->dd_uncompressed_bytes, tx); 1246 1247 if (dd->dd_phys->dd_reserved > dd->dd_phys->dd_used_bytes) { 1248 uint64_t unused_rsrv = dd->dd_phys->dd_reserved - 1249 dd->dd_phys->dd_used_bytes; 1250 1251 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV, 1252 -unused_rsrv, 0, 0, tx); 1253 dsl_dir_diduse_space(ra->newparent, DD_USED_CHILD_RSRV, 1254 unused_rsrv, 0, 0, tx); 1255 } 1256 } 1257 1258 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1259 1260 /* remove from old parent zapobj */ 1261 err = zap_remove(mos, dd->dd_parent->dd_phys->dd_child_dir_zapobj, 1262 dd->dd_myname, tx); 1263 ASSERT3U(err, ==, 0); 1264 1265 (void) strcpy(dd->dd_myname, ra->mynewname); 1266 dsl_dir_close(dd->dd_parent, dd); 1267 dd->dd_phys->dd_parent_obj = ra->newparent->dd_object; 1268 VERIFY(0 == dsl_dir_open_obj(dd->dd_pool, 1269 ra->newparent->dd_object, NULL, dd, &dd->dd_parent)); 1270 1271 /* add to new parent zapobj */ 1272 err = zap_add(mos, ra->newparent->dd_phys->dd_child_dir_zapobj, 1273 dd->dd_myname, 8, 1, &dd->dd_object, tx); 1274 ASSERT3U(err, ==, 0); 1275 1276 spa_history_internal_log(LOG_DS_RENAME, dd->dd_pool->dp_spa, 1277 tx, cr, "dataset = %llu", dd->dd_phys->dd_head_dataset_obj); 1278 } 1279 1280 int 1281 dsl_dir_rename(dsl_dir_t *dd, const char *newname) 1282 { 1283 struct renamearg ra; 1284 int err; 1285 1286 /* new parent should exist */ 1287 err = dsl_dir_open(newname, FTAG, &ra.newparent, &ra.mynewname); 1288 if (err) 1289 return (err); 1290 1291 /* can't rename to different pool */ 1292 if (dd->dd_pool != ra.newparent->dd_pool) { 1293 err = ENXIO; 1294 goto out; 1295 } 1296 1297 /* new name should not already exist */ 1298 if (ra.mynewname == NULL) { 1299 err = EEXIST; 1300 goto out; 1301 } 1302 1303 err = dsl_sync_task_do(dd->dd_pool, 1304 dsl_dir_rename_check, dsl_dir_rename_sync, dd, &ra, 3); 1305 1306 out: 1307 dsl_dir_close(ra.newparent, FTAG); 1308 return (err); 1309 } 1310 1311 int 1312 dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd, uint64_t space) 1313 { 1314 dsl_dir_t *ancestor; 1315 int64_t adelta; 1316 uint64_t avail; 1317 1318 ancestor = closest_common_ancestor(sdd, tdd); 1319 adelta = would_change(sdd, -space, ancestor); 1320 avail = dsl_dir_space_available(tdd, ancestor, adelta, FALSE); 1321 if (avail < space) 1322 return (ENOSPC); 1323 1324 return (0); 1325 } 1326