dsl_dir.c revision 260763
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>. 24 * All rights reserved. 25 * Copyright (c) 2013 by Delphix. All rights reserved. 26 */ 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/dsl_deleg.h> 36#include <sys/spa.h> 37#include <sys/metaslab.h> 38#include <sys/zap.h> 39#include <sys/zio.h> 40#include <sys/arc.h> 41#include <sys/sunddi.h> 42#include <sys/zvol.h> 43#ifdef _KERNEL 44#include <sys/zfs_vfsops.h> 45#endif 46#include "zfs_namecheck.h" 47 48static uint64_t dsl_dir_space_towrite(dsl_dir_t *dd); 49 50/* ARGSUSED */ 51static void 52dsl_dir_evict(dmu_buf_t *db, void *arg) 53{ 54 dsl_dir_t *dd = arg; 55 dsl_pool_t *dp = dd->dd_pool; 56 int t; 57 58 for (t = 0; t < TXG_SIZE; t++) { 59 ASSERT(!txg_list_member(&dp->dp_dirty_dirs, dd, t)); 60 ASSERT(dd->dd_tempreserved[t] == 0); 61 ASSERT(dd->dd_space_towrite[t] == 0); 62 } 63 64 if (dd->dd_parent) 65 dsl_dir_rele(dd->dd_parent, dd); 66 67 spa_close(dd->dd_pool->dp_spa, dd); 68 69 /* 70 * The props callback list should have been cleaned up by 71 * objset_evict(). 72 */ 73 list_destroy(&dd->dd_prop_cbs); 74 mutex_destroy(&dd->dd_lock); 75 kmem_free(dd, sizeof (dsl_dir_t)); 76} 77 78int 79dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj, 80 const char *tail, void *tag, dsl_dir_t **ddp) 81{ 82 dmu_buf_t *dbuf; 83 dsl_dir_t *dd; 84 int err; 85 86 ASSERT(dsl_pool_config_held(dp)); 87 88 err = dmu_bonus_hold(dp->dp_meta_objset, ddobj, tag, &dbuf); 89 if (err != 0) 90 return (err); 91 dd = dmu_buf_get_user(dbuf); 92#ifdef ZFS_DEBUG 93 { 94 dmu_object_info_t doi; 95 dmu_object_info_from_db(dbuf, &doi); 96 ASSERT3U(doi.doi_type, ==, DMU_OT_DSL_DIR); 97 ASSERT3U(doi.doi_bonus_size, >=, sizeof (dsl_dir_phys_t)); 98 } 99#endif 100 if (dd == NULL) { 101 dsl_dir_t *winner; 102 103 dd = kmem_zalloc(sizeof (dsl_dir_t), KM_SLEEP); 104 dd->dd_object = ddobj; 105 dd->dd_dbuf = dbuf; 106 dd->dd_pool = dp; 107 dd->dd_phys = dbuf->db_data; 108 mutex_init(&dd->dd_lock, NULL, MUTEX_DEFAULT, NULL); 109 110 list_create(&dd->dd_prop_cbs, sizeof (dsl_prop_cb_record_t), 111 offsetof(dsl_prop_cb_record_t, cbr_node)); 112 113 dsl_dir_snap_cmtime_update(dd); 114 115 if (dd->dd_phys->dd_parent_obj) { 116 err = dsl_dir_hold_obj(dp, dd->dd_phys->dd_parent_obj, 117 NULL, dd, &dd->dd_parent); 118 if (err != 0) 119 goto errout; 120 if (tail) { 121#ifdef ZFS_DEBUG 122 uint64_t foundobj; 123 124 err = zap_lookup(dp->dp_meta_objset, 125 dd->dd_parent->dd_phys->dd_child_dir_zapobj, 126 tail, sizeof (foundobj), 1, &foundobj); 127 ASSERT(err || foundobj == ddobj); 128#endif 129 (void) strcpy(dd->dd_myname, tail); 130 } else { 131 err = zap_value_search(dp->dp_meta_objset, 132 dd->dd_parent->dd_phys->dd_child_dir_zapobj, 133 ddobj, 0, dd->dd_myname); 134 } 135 if (err != 0) 136 goto errout; 137 } else { 138 (void) strcpy(dd->dd_myname, spa_name(dp->dp_spa)); 139 } 140 141 if (dsl_dir_is_clone(dd)) { 142 dmu_buf_t *origin_bonus; 143 dsl_dataset_phys_t *origin_phys; 144 145 /* 146 * We can't open the origin dataset, because 147 * that would require opening this dsl_dir. 148 * Just look at its phys directly instead. 149 */ 150 err = dmu_bonus_hold(dp->dp_meta_objset, 151 dd->dd_phys->dd_origin_obj, FTAG, &origin_bonus); 152 if (err != 0) 153 goto errout; 154 origin_phys = origin_bonus->db_data; 155 dd->dd_origin_txg = 156 origin_phys->ds_creation_txg; 157 dmu_buf_rele(origin_bonus, FTAG); 158 } 159 160 winner = dmu_buf_set_user_ie(dbuf, dd, &dd->dd_phys, 161 dsl_dir_evict); 162 if (winner) { 163 if (dd->dd_parent) 164 dsl_dir_rele(dd->dd_parent, dd); 165 mutex_destroy(&dd->dd_lock); 166 kmem_free(dd, sizeof (dsl_dir_t)); 167 dd = winner; 168 } else { 169 spa_open_ref(dp->dp_spa, dd); 170 } 171 } 172 173 /* 174 * The dsl_dir_t has both open-to-close and instantiate-to-evict 175 * holds on the spa. We need the open-to-close holds because 176 * otherwise the spa_refcnt wouldn't change when we open a 177 * dir which the spa also has open, so we could incorrectly 178 * think it was OK to unload/export/destroy the pool. We need 179 * the instantiate-to-evict hold because the dsl_dir_t has a 180 * pointer to the dd_pool, which has a pointer to the spa_t. 181 */ 182 spa_open_ref(dp->dp_spa, tag); 183 ASSERT3P(dd->dd_pool, ==, dp); 184 ASSERT3U(dd->dd_object, ==, ddobj); 185 ASSERT3P(dd->dd_dbuf, ==, dbuf); 186 *ddp = dd; 187 return (0); 188 189errout: 190 if (dd->dd_parent) 191 dsl_dir_rele(dd->dd_parent, dd); 192 mutex_destroy(&dd->dd_lock); 193 kmem_free(dd, sizeof (dsl_dir_t)); 194 dmu_buf_rele(dbuf, tag); 195 return (err); 196} 197 198void 199dsl_dir_rele(dsl_dir_t *dd, void *tag) 200{ 201 dprintf_dd(dd, "%s\n", ""); 202 spa_close(dd->dd_pool->dp_spa, tag); 203 dmu_buf_rele(dd->dd_dbuf, tag); 204} 205 206/* buf must be long enough (MAXNAMELEN + strlen(MOS_DIR_NAME) + 1 should do) */ 207void 208dsl_dir_name(dsl_dir_t *dd, char *buf) 209{ 210 if (dd->dd_parent) { 211 dsl_dir_name(dd->dd_parent, buf); 212 (void) strcat(buf, "/"); 213 } else { 214 buf[0] = '\0'; 215 } 216 if (!MUTEX_HELD(&dd->dd_lock)) { 217 /* 218 * recursive mutex so that we can use 219 * dprintf_dd() with dd_lock held 220 */ 221 mutex_enter(&dd->dd_lock); 222 (void) strcat(buf, dd->dd_myname); 223 mutex_exit(&dd->dd_lock); 224 } else { 225 (void) strcat(buf, dd->dd_myname); 226 } 227} 228 229/* Calculate name length, avoiding all the strcat calls of dsl_dir_name */ 230int 231dsl_dir_namelen(dsl_dir_t *dd) 232{ 233 int result = 0; 234 235 if (dd->dd_parent) { 236 /* parent's name + 1 for the "/" */ 237 result = dsl_dir_namelen(dd->dd_parent) + 1; 238 } 239 240 if (!MUTEX_HELD(&dd->dd_lock)) { 241 /* see dsl_dir_name */ 242 mutex_enter(&dd->dd_lock); 243 result += strlen(dd->dd_myname); 244 mutex_exit(&dd->dd_lock); 245 } else { 246 result += strlen(dd->dd_myname); 247 } 248 249 return (result); 250} 251 252static int 253getcomponent(const char *path, char *component, const char **nextp) 254{ 255 char *p; 256 257 if ((path == NULL) || (path[0] == '\0')) 258 return (SET_ERROR(ENOENT)); 259 /* This would be a good place to reserve some namespace... */ 260 p = strpbrk(path, "/@"); 261 if (p && (p[1] == '/' || p[1] == '@')) { 262 /* two separators in a row */ 263 return (SET_ERROR(EINVAL)); 264 } 265 if (p == NULL || p == path) { 266 /* 267 * if the first thing is an @ or /, it had better be an 268 * @ and it had better not have any more ats or slashes, 269 * and it had better have something after the @. 270 */ 271 if (p != NULL && 272 (p[0] != '@' || strpbrk(path+1, "/@") || p[1] == '\0')) 273 return (SET_ERROR(EINVAL)); 274 if (strlen(path) >= MAXNAMELEN) 275 return (SET_ERROR(ENAMETOOLONG)); 276 (void) strcpy(component, path); 277 p = NULL; 278 } else if (p[0] == '/') { 279 if (p - path >= MAXNAMELEN) 280 return (SET_ERROR(ENAMETOOLONG)); 281 (void) strncpy(component, path, p - path); 282 component[p - path] = '\0'; 283 p++; 284 } else if (p[0] == '@') { 285 /* 286 * if the next separator is an @, there better not be 287 * any more slashes. 288 */ 289 if (strchr(path, '/')) 290 return (SET_ERROR(EINVAL)); 291 if (p - path >= MAXNAMELEN) 292 return (SET_ERROR(ENAMETOOLONG)); 293 (void) strncpy(component, path, p - path); 294 component[p - path] = '\0'; 295 } else { 296 panic("invalid p=%p", (void *)p); 297 } 298 *nextp = p; 299 return (0); 300} 301 302/* 303 * Return the dsl_dir_t, and possibly the last component which couldn't 304 * be found in *tail. The name must be in the specified dsl_pool_t. This 305 * thread must hold the dp_config_rwlock for the pool. Returns NULL if the 306 * path is bogus, or if tail==NULL and we couldn't parse the whole name. 307 * (*tail)[0] == '@' means that the last component is a snapshot. 308 */ 309int 310dsl_dir_hold(dsl_pool_t *dp, const char *name, void *tag, 311 dsl_dir_t **ddp, const char **tailp) 312{ 313 char buf[MAXNAMELEN]; 314 const char *spaname, *next, *nextnext = NULL; 315 int err; 316 dsl_dir_t *dd; 317 uint64_t ddobj; 318 319 err = getcomponent(name, buf, &next); 320 if (err != 0) 321 return (err); 322 323 /* Make sure the name is in the specified pool. */ 324 spaname = spa_name(dp->dp_spa); 325 if (strcmp(buf, spaname) != 0) 326 return (SET_ERROR(EINVAL)); 327 328 ASSERT(dsl_pool_config_held(dp)); 329 330 err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, NULL, tag, &dd); 331 if (err != 0) { 332 return (err); 333 } 334 335 while (next != NULL) { 336 dsl_dir_t *child_ds; 337 err = getcomponent(next, buf, &nextnext); 338 if (err != 0) 339 break; 340 ASSERT(next[0] != '\0'); 341 if (next[0] == '@') 342 break; 343 dprintf("looking up %s in obj%lld\n", 344 buf, dd->dd_phys->dd_child_dir_zapobj); 345 346 err = zap_lookup(dp->dp_meta_objset, 347 dd->dd_phys->dd_child_dir_zapobj, 348 buf, sizeof (ddobj), 1, &ddobj); 349 if (err != 0) { 350 if (err == ENOENT) 351 err = 0; 352 break; 353 } 354 355 err = dsl_dir_hold_obj(dp, ddobj, buf, tag, &child_ds); 356 if (err != 0) 357 break; 358 dsl_dir_rele(dd, tag); 359 dd = child_ds; 360 next = nextnext; 361 } 362 363 if (err != 0) { 364 dsl_dir_rele(dd, tag); 365 return (err); 366 } 367 368 /* 369 * It's an error if there's more than one component left, or 370 * tailp==NULL and there's any component left. 371 */ 372 if (next != NULL && 373 (tailp == NULL || (nextnext && nextnext[0] != '\0'))) { 374 /* bad path name */ 375 dsl_dir_rele(dd, tag); 376 dprintf("next=%p (%s) tail=%p\n", next, next?next:"", tailp); 377 err = SET_ERROR(ENOENT); 378 } 379 if (tailp != NULL) 380 *tailp = next; 381 *ddp = dd; 382 return (err); 383} 384 385uint64_t 386dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds, const char *name, 387 dmu_tx_t *tx) 388{ 389 objset_t *mos = dp->dp_meta_objset; 390 uint64_t ddobj; 391 dsl_dir_phys_t *ddphys; 392 dmu_buf_t *dbuf; 393 394 ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0, 395 DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx); 396 if (pds) { 397 VERIFY(0 == zap_add(mos, pds->dd_phys->dd_child_dir_zapobj, 398 name, sizeof (uint64_t), 1, &ddobj, tx)); 399 } else { 400 /* it's the root dir */ 401 VERIFY(0 == zap_add(mos, DMU_POOL_DIRECTORY_OBJECT, 402 DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, &ddobj, tx)); 403 } 404 VERIFY(0 == dmu_bonus_hold(mos, ddobj, FTAG, &dbuf)); 405 dmu_buf_will_dirty(dbuf, tx); 406 ddphys = dbuf->db_data; 407 408 ddphys->dd_creation_time = gethrestime_sec(); 409 if (pds) 410 ddphys->dd_parent_obj = pds->dd_object; 411 ddphys->dd_props_zapobj = zap_create(mos, 412 DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx); 413 ddphys->dd_child_dir_zapobj = zap_create(mos, 414 DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx); 415 if (spa_version(dp->dp_spa) >= SPA_VERSION_USED_BREAKDOWN) 416 ddphys->dd_flags |= DD_FLAG_USED_BREAKDOWN; 417 dmu_buf_rele(dbuf, FTAG); 418 419 return (ddobj); 420} 421 422boolean_t 423dsl_dir_is_clone(dsl_dir_t *dd) 424{ 425 return (dd->dd_phys->dd_origin_obj && 426 (dd->dd_pool->dp_origin_snap == NULL || 427 dd->dd_phys->dd_origin_obj != 428 dd->dd_pool->dp_origin_snap->ds_object)); 429} 430 431void 432dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv) 433{ 434 mutex_enter(&dd->dd_lock); 435 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 436 dd->dd_phys->dd_used_bytes); 437 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_QUOTA, dd->dd_phys->dd_quota); 438 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_RESERVATION, 439 dd->dd_phys->dd_reserved); 440 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 441 dd->dd_phys->dd_compressed_bytes == 0 ? 100 : 442 (dd->dd_phys->dd_uncompressed_bytes * 100 / 443 dd->dd_phys->dd_compressed_bytes)); 444 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALUSED, 445 dd->dd_phys->dd_uncompressed_bytes); 446 if (dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 447 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDSNAP, 448 dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]); 449 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDDS, 450 dd->dd_phys->dd_used_breakdown[DD_USED_HEAD]); 451 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDREFRESERV, 452 dd->dd_phys->dd_used_breakdown[DD_USED_REFRSRV]); 453 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDCHILD, 454 dd->dd_phys->dd_used_breakdown[DD_USED_CHILD] + 455 dd->dd_phys->dd_used_breakdown[DD_USED_CHILD_RSRV]); 456 } 457 mutex_exit(&dd->dd_lock); 458 459 if (dsl_dir_is_clone(dd)) { 460 dsl_dataset_t *ds; 461 char buf[MAXNAMELEN]; 462 463 VERIFY0(dsl_dataset_hold_obj(dd->dd_pool, 464 dd->dd_phys->dd_origin_obj, FTAG, &ds)); 465 dsl_dataset_name(ds, buf); 466 dsl_dataset_rele(ds, FTAG); 467 dsl_prop_nvlist_add_string(nv, ZFS_PROP_ORIGIN, buf); 468 } 469} 470 471void 472dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx) 473{ 474 dsl_pool_t *dp = dd->dd_pool; 475 476 ASSERT(dd->dd_phys); 477 478 if (txg_list_add(&dp->dp_dirty_dirs, dd, tx->tx_txg)) { 479 /* up the hold count until we can be written out */ 480 dmu_buf_add_ref(dd->dd_dbuf, dd); 481 } 482} 483 484static int64_t 485parent_delta(dsl_dir_t *dd, uint64_t used, int64_t delta) 486{ 487 uint64_t old_accounted = MAX(used, dd->dd_phys->dd_reserved); 488 uint64_t new_accounted = MAX(used + delta, dd->dd_phys->dd_reserved); 489 return (new_accounted - old_accounted); 490} 491 492void 493dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx) 494{ 495 ASSERT(dmu_tx_is_syncing(tx)); 496 497 mutex_enter(&dd->dd_lock); 498 ASSERT0(dd->dd_tempreserved[tx->tx_txg&TXG_MASK]); 499 dprintf_dd(dd, "txg=%llu towrite=%lluK\n", tx->tx_txg, 500 dd->dd_space_towrite[tx->tx_txg&TXG_MASK] / 1024); 501 dd->dd_space_towrite[tx->tx_txg&TXG_MASK] = 0; 502 mutex_exit(&dd->dd_lock); 503 504 /* release the hold from dsl_dir_dirty */ 505 dmu_buf_rele(dd->dd_dbuf, dd); 506} 507 508static uint64_t 509dsl_dir_space_towrite(dsl_dir_t *dd) 510{ 511 uint64_t space = 0; 512 int i; 513 514 ASSERT(MUTEX_HELD(&dd->dd_lock)); 515 516 for (i = 0; i < TXG_SIZE; i++) { 517 space += dd->dd_space_towrite[i&TXG_MASK]; 518 ASSERT3U(dd->dd_space_towrite[i&TXG_MASK], >=, 0); 519 } 520 return (space); 521} 522 523/* 524 * How much space would dd have available if ancestor had delta applied 525 * to it? If ondiskonly is set, we're only interested in what's 526 * on-disk, not estimated pending changes. 527 */ 528uint64_t 529dsl_dir_space_available(dsl_dir_t *dd, 530 dsl_dir_t *ancestor, int64_t delta, int ondiskonly) 531{ 532 uint64_t parentspace, myspace, quota, used; 533 534 /* 535 * If there are no restrictions otherwise, assume we have 536 * unlimited space available. 537 */ 538 quota = UINT64_MAX; 539 parentspace = UINT64_MAX; 540 541 if (dd->dd_parent != NULL) { 542 parentspace = dsl_dir_space_available(dd->dd_parent, 543 ancestor, delta, ondiskonly); 544 } 545 546 mutex_enter(&dd->dd_lock); 547 if (dd->dd_phys->dd_quota != 0) 548 quota = dd->dd_phys->dd_quota; 549 used = dd->dd_phys->dd_used_bytes; 550 if (!ondiskonly) 551 used += dsl_dir_space_towrite(dd); 552 553 if (dd->dd_parent == NULL) { 554 uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, FALSE); 555 quota = MIN(quota, poolsize); 556 } 557 558 if (dd->dd_phys->dd_reserved > used && parentspace != UINT64_MAX) { 559 /* 560 * We have some space reserved, in addition to what our 561 * parent gave us. 562 */ 563 parentspace += dd->dd_phys->dd_reserved - used; 564 } 565 566 if (dd == ancestor) { 567 ASSERT(delta <= 0); 568 ASSERT(used >= -delta); 569 used += delta; 570 if (parentspace != UINT64_MAX) 571 parentspace -= delta; 572 } 573 574 if (used > quota) { 575 /* over quota */ 576 myspace = 0; 577 } else { 578 /* 579 * the lesser of the space provided by our parent and 580 * the space left in our quota 581 */ 582 myspace = MIN(parentspace, quota - used); 583 } 584 585 mutex_exit(&dd->dd_lock); 586 587 return (myspace); 588} 589 590struct tempreserve { 591 list_node_t tr_node; 592 dsl_dir_t *tr_ds; 593 uint64_t tr_size; 594}; 595 596static int 597dsl_dir_tempreserve_impl(dsl_dir_t *dd, uint64_t asize, boolean_t netfree, 598 boolean_t ignorequota, boolean_t checkrefquota, list_t *tr_list, 599 dmu_tx_t *tx, boolean_t first) 600{ 601 uint64_t txg = tx->tx_txg; 602 uint64_t est_inflight, used_on_disk, quota, parent_rsrv; 603 uint64_t deferred = 0; 604 struct tempreserve *tr; 605 int retval = EDQUOT; 606 int txgidx = txg & TXG_MASK; 607 int i; 608 uint64_t ref_rsrv = 0; 609 610 ASSERT3U(txg, !=, 0); 611 ASSERT3S(asize, >, 0); 612 613 mutex_enter(&dd->dd_lock); 614 615 /* 616 * Check against the dsl_dir's quota. We don't add in the delta 617 * when checking for over-quota because they get one free hit. 618 */ 619 est_inflight = dsl_dir_space_towrite(dd); 620 for (i = 0; i < TXG_SIZE; i++) 621 est_inflight += dd->dd_tempreserved[i]; 622 used_on_disk = dd->dd_phys->dd_used_bytes; 623 624 /* 625 * On the first iteration, fetch the dataset's used-on-disk and 626 * refreservation values. Also, if checkrefquota is set, test if 627 * allocating this space would exceed the dataset's refquota. 628 */ 629 if (first && tx->tx_objset) { 630 int error; 631 dsl_dataset_t *ds = tx->tx_objset->os_dsl_dataset; 632 633 error = dsl_dataset_check_quota(ds, checkrefquota, 634 asize, est_inflight, &used_on_disk, &ref_rsrv); 635 if (error) { 636 mutex_exit(&dd->dd_lock); 637 return (error); 638 } 639 } 640 641 /* 642 * If this transaction will result in a net free of space, 643 * we want to let it through. 644 */ 645 if (ignorequota || netfree || dd->dd_phys->dd_quota == 0) 646 quota = UINT64_MAX; 647 else 648 quota = dd->dd_phys->dd_quota; 649 650 /* 651 * Adjust the quota against the actual pool size at the root 652 * minus any outstanding deferred frees. 653 * To ensure that it's possible to remove files from a full 654 * pool without inducing transient overcommits, we throttle 655 * netfree transactions against a quota that is slightly larger, 656 * but still within the pool's allocation slop. In cases where 657 * we're very close to full, this will allow a steady trickle of 658 * removes to get through. 659 */ 660 if (dd->dd_parent == NULL) { 661 spa_t *spa = dd->dd_pool->dp_spa; 662 uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, netfree); 663 deferred = metaslab_class_get_deferred(spa_normal_class(spa)); 664 if (poolsize - deferred < quota) { 665 quota = poolsize - deferred; 666 retval = ENOSPC; 667 } 668 } 669 670 /* 671 * If they are requesting more space, and our current estimate 672 * is over quota, they get to try again unless the actual 673 * on-disk is over quota and there are no pending changes (which 674 * may free up space for us). 675 */ 676 if (used_on_disk + est_inflight >= quota) { 677 if (est_inflight > 0 || used_on_disk < quota || 678 (retval == ENOSPC && used_on_disk < quota + deferred)) 679 retval = ERESTART; 680 dprintf_dd(dd, "failing: used=%lluK inflight = %lluK " 681 "quota=%lluK tr=%lluK err=%d\n", 682 used_on_disk>>10, est_inflight>>10, 683 quota>>10, asize>>10, retval); 684 mutex_exit(&dd->dd_lock); 685 return (SET_ERROR(retval)); 686 } 687 688 /* We need to up our estimated delta before dropping dd_lock */ 689 dd->dd_tempreserved[txgidx] += asize; 690 691 parent_rsrv = parent_delta(dd, used_on_disk + est_inflight, 692 asize - ref_rsrv); 693 mutex_exit(&dd->dd_lock); 694 695 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP); 696 tr->tr_ds = dd; 697 tr->tr_size = asize; 698 list_insert_tail(tr_list, tr); 699 700 /* see if it's OK with our parent */ 701 if (dd->dd_parent && parent_rsrv) { 702 boolean_t ismos = (dd->dd_phys->dd_head_dataset_obj == 0); 703 704 return (dsl_dir_tempreserve_impl(dd->dd_parent, 705 parent_rsrv, netfree, ismos, TRUE, tr_list, tx, FALSE)); 706 } else { 707 return (0); 708 } 709} 710 711/* 712 * Reserve space in this dsl_dir, to be used in this tx's txg. 713 * After the space has been dirtied (and dsl_dir_willuse_space() 714 * has been called), the reservation should be canceled, using 715 * dsl_dir_tempreserve_clear(). 716 */ 717int 718dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize, uint64_t asize, 719 uint64_t fsize, uint64_t usize, void **tr_cookiep, dmu_tx_t *tx) 720{ 721 int err; 722 list_t *tr_list; 723 724 if (asize == 0) { 725 *tr_cookiep = NULL; 726 return (0); 727 } 728 729 tr_list = kmem_alloc(sizeof (list_t), KM_SLEEP); 730 list_create(tr_list, sizeof (struct tempreserve), 731 offsetof(struct tempreserve, tr_node)); 732 ASSERT3S(asize, >, 0); 733 ASSERT3S(fsize, >=, 0); 734 735 err = arc_tempreserve_space(lsize, tx->tx_txg); 736 if (err == 0) { 737 struct tempreserve *tr; 738 739 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP); 740 tr->tr_size = lsize; 741 list_insert_tail(tr_list, tr); 742 } else { 743 if (err == EAGAIN) { 744 /* 745 * If arc_memory_throttle() detected that pageout 746 * is running and we are low on memory, we delay new 747 * non-pageout transactions to give pageout an 748 * advantage. 749 * 750 * It is unfortunate to be delaying while the caller's 751 * locks are held. 752 */ 753 txg_delay(dd->dd_pool, tx->tx_txg, 754 MSEC2NSEC(10), MSEC2NSEC(10)); 755 err = SET_ERROR(ERESTART); 756 } 757 } 758 759 if (err == 0) { 760 err = dsl_dir_tempreserve_impl(dd, asize, fsize >= asize, 761 FALSE, asize > usize, tr_list, tx, TRUE); 762 } 763 764 if (err != 0) 765 dsl_dir_tempreserve_clear(tr_list, tx); 766 else 767 *tr_cookiep = tr_list; 768 769 return (err); 770} 771 772/* 773 * Clear a temporary reservation that we previously made with 774 * dsl_dir_tempreserve_space(). 775 */ 776void 777dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx) 778{ 779 int txgidx = tx->tx_txg & TXG_MASK; 780 list_t *tr_list = tr_cookie; 781 struct tempreserve *tr; 782 783 ASSERT3U(tx->tx_txg, !=, 0); 784 785 if (tr_cookie == NULL) 786 return; 787 788 while ((tr = list_head(tr_list)) != NULL) { 789 if (tr->tr_ds) { 790 mutex_enter(&tr->tr_ds->dd_lock); 791 ASSERT3U(tr->tr_ds->dd_tempreserved[txgidx], >=, 792 tr->tr_size); 793 tr->tr_ds->dd_tempreserved[txgidx] -= tr->tr_size; 794 mutex_exit(&tr->tr_ds->dd_lock); 795 } else { 796 arc_tempreserve_clear(tr->tr_size); 797 } 798 list_remove(tr_list, tr); 799 kmem_free(tr, sizeof (struct tempreserve)); 800 } 801 802 kmem_free(tr_list, sizeof (list_t)); 803} 804 805/* 806 * This should be called from open context when we think we're going to write 807 * or free space, for example when dirtying data. Be conservative; it's okay 808 * to write less space or free more, but we don't want to write more or free 809 * less than the amount specified. 810 */ 811void 812dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx) 813{ 814 int64_t parent_space; 815 uint64_t est_used; 816 817 mutex_enter(&dd->dd_lock); 818 if (space > 0) 819 dd->dd_space_towrite[tx->tx_txg & TXG_MASK] += space; 820 821 est_used = dsl_dir_space_towrite(dd) + dd->dd_phys->dd_used_bytes; 822 parent_space = parent_delta(dd, est_used, space); 823 mutex_exit(&dd->dd_lock); 824 825 /* Make sure that we clean up dd_space_to* */ 826 dsl_dir_dirty(dd, tx); 827 828 /* XXX this is potentially expensive and unnecessary... */ 829 if (parent_space && dd->dd_parent) 830 dsl_dir_willuse_space(dd->dd_parent, parent_space, tx); 831} 832 833/* call from syncing context when we actually write/free space for this dd */ 834void 835dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type, 836 int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx) 837{ 838 int64_t accounted_delta; 839 840 /* 841 * dsl_dataset_set_refreservation_sync_impl() calls this with 842 * dd_lock held, so that it can atomically update 843 * ds->ds_reserved and the dsl_dir accounting, so that 844 * dsl_dataset_check_quota() can see dataset and dir accounting 845 * consistently. 846 */ 847 boolean_t needlock = !MUTEX_HELD(&dd->dd_lock); 848 849 ASSERT(dmu_tx_is_syncing(tx)); 850 ASSERT(type < DD_USED_NUM); 851 852 dmu_buf_will_dirty(dd->dd_dbuf, tx); 853 854 if (needlock) 855 mutex_enter(&dd->dd_lock); 856 accounted_delta = parent_delta(dd, dd->dd_phys->dd_used_bytes, used); 857 ASSERT(used >= 0 || dd->dd_phys->dd_used_bytes >= -used); 858 ASSERT(compressed >= 0 || 859 dd->dd_phys->dd_compressed_bytes >= -compressed); 860 ASSERT(uncompressed >= 0 || 861 dd->dd_phys->dd_uncompressed_bytes >= -uncompressed); 862 dd->dd_phys->dd_used_bytes += used; 863 dd->dd_phys->dd_uncompressed_bytes += uncompressed; 864 dd->dd_phys->dd_compressed_bytes += compressed; 865 866 if (dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 867 ASSERT(used > 0 || 868 dd->dd_phys->dd_used_breakdown[type] >= -used); 869 dd->dd_phys->dd_used_breakdown[type] += used; 870#ifdef DEBUG 871 dd_used_t t; 872 uint64_t u = 0; 873 for (t = 0; t < DD_USED_NUM; t++) 874 u += dd->dd_phys->dd_used_breakdown[t]; 875 ASSERT3U(u, ==, dd->dd_phys->dd_used_bytes); 876#endif 877 } 878 if (needlock) 879 mutex_exit(&dd->dd_lock); 880 881 if (dd->dd_parent != NULL) { 882 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD, 883 accounted_delta, compressed, uncompressed, tx); 884 dsl_dir_transfer_space(dd->dd_parent, 885 used - accounted_delta, 886 DD_USED_CHILD_RSRV, DD_USED_CHILD, tx); 887 } 888} 889 890void 891dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta, 892 dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx) 893{ 894 ASSERT(dmu_tx_is_syncing(tx)); 895 ASSERT(oldtype < DD_USED_NUM); 896 ASSERT(newtype < DD_USED_NUM); 897 898 if (delta == 0 || !(dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN)) 899 return; 900 901 dmu_buf_will_dirty(dd->dd_dbuf, tx); 902 mutex_enter(&dd->dd_lock); 903 ASSERT(delta > 0 ? 904 dd->dd_phys->dd_used_breakdown[oldtype] >= delta : 905 dd->dd_phys->dd_used_breakdown[newtype] >= -delta); 906 ASSERT(dd->dd_phys->dd_used_bytes >= ABS(delta)); 907 dd->dd_phys->dd_used_breakdown[oldtype] -= delta; 908 dd->dd_phys->dd_used_breakdown[newtype] += delta; 909 mutex_exit(&dd->dd_lock); 910} 911 912typedef struct dsl_dir_set_qr_arg { 913 const char *ddsqra_name; 914 zprop_source_t ddsqra_source; 915 uint64_t ddsqra_value; 916} dsl_dir_set_qr_arg_t; 917 918static int 919dsl_dir_set_quota_check(void *arg, dmu_tx_t *tx) 920{ 921 dsl_dir_set_qr_arg_t *ddsqra = arg; 922 dsl_pool_t *dp = dmu_tx_pool(tx); 923 dsl_dataset_t *ds; 924 int error; 925 uint64_t towrite, newval; 926 927 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 928 if (error != 0) 929 return (error); 930 931 error = dsl_prop_predict(ds->ds_dir, "quota", 932 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 933 if (error != 0) { 934 dsl_dataset_rele(ds, FTAG); 935 return (error); 936 } 937 938 if (newval == 0) { 939 dsl_dataset_rele(ds, FTAG); 940 return (0); 941 } 942 943 mutex_enter(&ds->ds_dir->dd_lock); 944 /* 945 * If we are doing the preliminary check in open context, and 946 * there are pending changes, then don't fail it, since the 947 * pending changes could under-estimate the amount of space to be 948 * freed up. 949 */ 950 towrite = dsl_dir_space_towrite(ds->ds_dir); 951 if ((dmu_tx_is_syncing(tx) || towrite == 0) && 952 (newval < ds->ds_dir->dd_phys->dd_reserved || 953 newval < ds->ds_dir->dd_phys->dd_used_bytes + towrite)) { 954 error = SET_ERROR(ENOSPC); 955 } 956 mutex_exit(&ds->ds_dir->dd_lock); 957 dsl_dataset_rele(ds, FTAG); 958 return (error); 959} 960 961static void 962dsl_dir_set_quota_sync(void *arg, dmu_tx_t *tx) 963{ 964 dsl_dir_set_qr_arg_t *ddsqra = arg; 965 dsl_pool_t *dp = dmu_tx_pool(tx); 966 dsl_dataset_t *ds; 967 uint64_t newval; 968 969 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 970 971 if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) { 972 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_QUOTA), 973 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 974 &ddsqra->ddsqra_value, tx); 975 976 VERIFY0(dsl_prop_get_int_ds(ds, 977 zfs_prop_to_name(ZFS_PROP_QUOTA), &newval)); 978 } else { 979 newval = ddsqra->ddsqra_value; 980 spa_history_log_internal_ds(ds, "set", tx, "%s=%lld", 981 zfs_prop_to_name(ZFS_PROP_QUOTA), (longlong_t)newval); 982 } 983 984 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); 985 mutex_enter(&ds->ds_dir->dd_lock); 986 ds->ds_dir->dd_phys->dd_quota = newval; 987 mutex_exit(&ds->ds_dir->dd_lock); 988 dsl_dataset_rele(ds, FTAG); 989} 990 991int 992dsl_dir_set_quota(const char *ddname, zprop_source_t source, uint64_t quota) 993{ 994 dsl_dir_set_qr_arg_t ddsqra; 995 996 ddsqra.ddsqra_name = ddname; 997 ddsqra.ddsqra_source = source; 998 ddsqra.ddsqra_value = quota; 999 1000 return (dsl_sync_task(ddname, dsl_dir_set_quota_check, 1001 dsl_dir_set_quota_sync, &ddsqra, 0)); 1002} 1003 1004int 1005dsl_dir_set_reservation_check(void *arg, dmu_tx_t *tx) 1006{ 1007 dsl_dir_set_qr_arg_t *ddsqra = arg; 1008 dsl_pool_t *dp = dmu_tx_pool(tx); 1009 dsl_dataset_t *ds; 1010 dsl_dir_t *dd; 1011 uint64_t newval, used, avail; 1012 int error; 1013 1014 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 1015 if (error != 0) 1016 return (error); 1017 dd = ds->ds_dir; 1018 1019 /* 1020 * If we are doing the preliminary check in open context, the 1021 * space estimates may be inaccurate. 1022 */ 1023 if (!dmu_tx_is_syncing(tx)) { 1024 dsl_dataset_rele(ds, FTAG); 1025 return (0); 1026 } 1027 1028 error = dsl_prop_predict(ds->ds_dir, 1029 zfs_prop_to_name(ZFS_PROP_RESERVATION), 1030 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 1031 if (error != 0) { 1032 dsl_dataset_rele(ds, FTAG); 1033 return (error); 1034 } 1035 1036 mutex_enter(&dd->dd_lock); 1037 used = dd->dd_phys->dd_used_bytes; 1038 mutex_exit(&dd->dd_lock); 1039 1040 if (dd->dd_parent) { 1041 avail = dsl_dir_space_available(dd->dd_parent, 1042 NULL, 0, FALSE); 1043 } else { 1044 avail = dsl_pool_adjustedsize(dd->dd_pool, B_FALSE) - used; 1045 } 1046 1047 if (MAX(used, newval) > MAX(used, dd->dd_phys->dd_reserved)) { 1048 uint64_t delta = MAX(used, newval) - 1049 MAX(used, dd->dd_phys->dd_reserved); 1050 1051 if (delta > avail || 1052 (dd->dd_phys->dd_quota > 0 && 1053 newval > dd->dd_phys->dd_quota)) 1054 error = SET_ERROR(ENOSPC); 1055 } 1056 1057 dsl_dataset_rele(ds, FTAG); 1058 return (error); 1059} 1060 1061void 1062dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value, dmu_tx_t *tx) 1063{ 1064 uint64_t used; 1065 int64_t delta; 1066 1067 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1068 1069 mutex_enter(&dd->dd_lock); 1070 used = dd->dd_phys->dd_used_bytes; 1071 delta = MAX(used, value) - MAX(used, dd->dd_phys->dd_reserved); 1072 dd->dd_phys->dd_reserved = value; 1073 1074 if (dd->dd_parent != NULL) { 1075 /* Roll up this additional usage into our ancestors */ 1076 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV, 1077 delta, 0, 0, tx); 1078 } 1079 mutex_exit(&dd->dd_lock); 1080} 1081 1082static void 1083dsl_dir_set_reservation_sync(void *arg, dmu_tx_t *tx) 1084{ 1085 dsl_dir_set_qr_arg_t *ddsqra = arg; 1086 dsl_pool_t *dp = dmu_tx_pool(tx); 1087 dsl_dataset_t *ds; 1088 uint64_t newval; 1089 1090 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 1091 1092 if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) { 1093 dsl_prop_set_sync_impl(ds, 1094 zfs_prop_to_name(ZFS_PROP_RESERVATION), 1095 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 1096 &ddsqra->ddsqra_value, tx); 1097 1098 VERIFY0(dsl_prop_get_int_ds(ds, 1099 zfs_prop_to_name(ZFS_PROP_RESERVATION), &newval)); 1100 } else { 1101 newval = ddsqra->ddsqra_value; 1102 spa_history_log_internal_ds(ds, "set", tx, "%s=%lld", 1103 zfs_prop_to_name(ZFS_PROP_RESERVATION), 1104 (longlong_t)newval); 1105 } 1106 1107 dsl_dir_set_reservation_sync_impl(ds->ds_dir, newval, tx); 1108 dsl_dataset_rele(ds, FTAG); 1109} 1110 1111int 1112dsl_dir_set_reservation(const char *ddname, zprop_source_t source, 1113 uint64_t reservation) 1114{ 1115 dsl_dir_set_qr_arg_t ddsqra; 1116 1117 ddsqra.ddsqra_name = ddname; 1118 ddsqra.ddsqra_source = source; 1119 ddsqra.ddsqra_value = reservation; 1120 1121 return (dsl_sync_task(ddname, dsl_dir_set_reservation_check, 1122 dsl_dir_set_reservation_sync, &ddsqra, 0)); 1123} 1124 1125static dsl_dir_t * 1126closest_common_ancestor(dsl_dir_t *ds1, dsl_dir_t *ds2) 1127{ 1128 for (; ds1; ds1 = ds1->dd_parent) { 1129 dsl_dir_t *dd; 1130 for (dd = ds2; dd; dd = dd->dd_parent) { 1131 if (ds1 == dd) 1132 return (dd); 1133 } 1134 } 1135 return (NULL); 1136} 1137 1138/* 1139 * If delta is applied to dd, how much of that delta would be applied to 1140 * ancestor? Syncing context only. 1141 */ 1142static int64_t 1143would_change(dsl_dir_t *dd, int64_t delta, dsl_dir_t *ancestor) 1144{ 1145 if (dd == ancestor) 1146 return (delta); 1147 1148 mutex_enter(&dd->dd_lock); 1149 delta = parent_delta(dd, dd->dd_phys->dd_used_bytes, delta); 1150 mutex_exit(&dd->dd_lock); 1151 return (would_change(dd->dd_parent, delta, ancestor)); 1152} 1153 1154typedef struct dsl_dir_rename_arg { 1155 const char *ddra_oldname; 1156 const char *ddra_newname; 1157} dsl_dir_rename_arg_t; 1158 1159/* ARGSUSED */ 1160static int 1161dsl_valid_rename(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) 1162{ 1163 int *deltap = arg; 1164 char namebuf[MAXNAMELEN]; 1165 1166 dsl_dataset_name(ds, namebuf); 1167 1168 if (strlen(namebuf) + *deltap >= MAXNAMELEN) 1169 return (SET_ERROR(ENAMETOOLONG)); 1170 return (0); 1171} 1172 1173static int 1174dsl_dir_rename_check(void *arg, dmu_tx_t *tx) 1175{ 1176 dsl_dir_rename_arg_t *ddra = arg; 1177 dsl_pool_t *dp = dmu_tx_pool(tx); 1178 dsl_dir_t *dd, *newparent; 1179 const char *mynewname; 1180 int error; 1181 int delta = strlen(ddra->ddra_newname) - strlen(ddra->ddra_oldname); 1182 1183 /* target dir should exist */ 1184 error = dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL); 1185 if (error != 0) 1186 return (error); 1187 1188 /* new parent should exist */ 1189 error = dsl_dir_hold(dp, ddra->ddra_newname, FTAG, 1190 &newparent, &mynewname); 1191 if (error != 0) { 1192 dsl_dir_rele(dd, FTAG); 1193 return (error); 1194 } 1195 1196 /* can't rename to different pool */ 1197 if (dd->dd_pool != newparent->dd_pool) { 1198 dsl_dir_rele(newparent, FTAG); 1199 dsl_dir_rele(dd, FTAG); 1200 return (SET_ERROR(ENXIO)); 1201 } 1202 1203 /* new name should not already exist */ 1204 if (mynewname == NULL) { 1205 dsl_dir_rele(newparent, FTAG); 1206 dsl_dir_rele(dd, FTAG); 1207 return (SET_ERROR(EEXIST)); 1208 } 1209 1210 /* if the name length is growing, validate child name lengths */ 1211 if (delta > 0) { 1212 error = dmu_objset_find_dp(dp, dd->dd_object, dsl_valid_rename, 1213 &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); 1214 if (error != 0) { 1215 dsl_dir_rele(newparent, FTAG); 1216 dsl_dir_rele(dd, FTAG); 1217 return (error); 1218 } 1219 } 1220 1221 if (newparent != dd->dd_parent) { 1222 /* is there enough space? */ 1223 uint64_t myspace = 1224 MAX(dd->dd_phys->dd_used_bytes, dd->dd_phys->dd_reserved); 1225 1226 /* no rename into our descendant */ 1227 if (closest_common_ancestor(dd, newparent) == dd) { 1228 dsl_dir_rele(newparent, FTAG); 1229 dsl_dir_rele(dd, FTAG); 1230 return (SET_ERROR(EINVAL)); 1231 } 1232 1233 error = dsl_dir_transfer_possible(dd->dd_parent, 1234 newparent, myspace); 1235 if (error != 0) { 1236 dsl_dir_rele(newparent, FTAG); 1237 dsl_dir_rele(dd, FTAG); 1238 return (error); 1239 } 1240 } 1241 1242 dsl_dir_rele(newparent, FTAG); 1243 dsl_dir_rele(dd, FTAG); 1244 return (0); 1245} 1246 1247static void 1248dsl_dir_rename_sync(void *arg, dmu_tx_t *tx) 1249{ 1250 dsl_dir_rename_arg_t *ddra = arg; 1251 dsl_pool_t *dp = dmu_tx_pool(tx); 1252 dsl_dir_t *dd, *newparent; 1253 const char *mynewname; 1254 int error; 1255 objset_t *mos = dp->dp_meta_objset; 1256 1257 VERIFY0(dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL)); 1258 VERIFY0(dsl_dir_hold(dp, ddra->ddra_newname, FTAG, &newparent, 1259 &mynewname)); 1260 1261 /* Log this before we change the name. */ 1262 spa_history_log_internal_dd(dd, "rename", tx, 1263 "-> %s", ddra->ddra_newname); 1264 1265 if (newparent != dd->dd_parent) { 1266 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD, 1267 -dd->dd_phys->dd_used_bytes, 1268 -dd->dd_phys->dd_compressed_bytes, 1269 -dd->dd_phys->dd_uncompressed_bytes, tx); 1270 dsl_dir_diduse_space(newparent, DD_USED_CHILD, 1271 dd->dd_phys->dd_used_bytes, 1272 dd->dd_phys->dd_compressed_bytes, 1273 dd->dd_phys->dd_uncompressed_bytes, tx); 1274 1275 if (dd->dd_phys->dd_reserved > dd->dd_phys->dd_used_bytes) { 1276 uint64_t unused_rsrv = dd->dd_phys->dd_reserved - 1277 dd->dd_phys->dd_used_bytes; 1278 1279 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV, 1280 -unused_rsrv, 0, 0, tx); 1281 dsl_dir_diduse_space(newparent, DD_USED_CHILD_RSRV, 1282 unused_rsrv, 0, 0, tx); 1283 } 1284 } 1285 1286 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1287 1288 /* remove from old parent zapobj */ 1289 error = zap_remove(mos, dd->dd_parent->dd_phys->dd_child_dir_zapobj, 1290 dd->dd_myname, tx); 1291 ASSERT0(error); 1292 1293 (void) strcpy(dd->dd_myname, mynewname); 1294 dsl_dir_rele(dd->dd_parent, dd); 1295 dd->dd_phys->dd_parent_obj = newparent->dd_object; 1296 VERIFY0(dsl_dir_hold_obj(dp, 1297 newparent->dd_object, NULL, dd, &dd->dd_parent)); 1298 1299 /* add to new parent zapobj */ 1300 VERIFY0(zap_add(mos, newparent->dd_phys->dd_child_dir_zapobj, 1301 dd->dd_myname, 8, 1, &dd->dd_object, tx)); 1302 1303#ifdef __FreeBSD__ 1304#ifdef _KERNEL 1305 zfsvfs_update_fromname(ddra->ddra_oldname, ddra->ddra_newname); 1306 zvol_rename_minors(ddra->ddra_oldname, ddra->ddra_newname); 1307#endif 1308#endif 1309 1310 dsl_prop_notify_all(dd); 1311 1312 dsl_dir_rele(newparent, FTAG); 1313 dsl_dir_rele(dd, FTAG); 1314} 1315 1316int 1317dsl_dir_rename(const char *oldname, const char *newname) 1318{ 1319 dsl_dir_rename_arg_t ddra; 1320 1321 ddra.ddra_oldname = oldname; 1322 ddra.ddra_newname = newname; 1323 1324 return (dsl_sync_task(oldname, 1325 dsl_dir_rename_check, dsl_dir_rename_sync, &ddra, 3)); 1326} 1327 1328int 1329dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd, uint64_t space) 1330{ 1331 dsl_dir_t *ancestor; 1332 int64_t adelta; 1333 uint64_t avail; 1334 1335 ancestor = closest_common_ancestor(sdd, tdd); 1336 adelta = would_change(sdd, -space, ancestor); 1337 avail = dsl_dir_space_available(tdd, ancestor, adelta, FALSE); 1338 if (avail < space) 1339 return (SET_ERROR(ENOSPC)); 1340 1341 return (0); 1342} 1343 1344timestruc_t 1345dsl_dir_snap_cmtime(dsl_dir_t *dd) 1346{ 1347 timestruc_t t; 1348 1349 mutex_enter(&dd->dd_lock); 1350 t = dd->dd_snap_cmtime; 1351 mutex_exit(&dd->dd_lock); 1352 1353 return (t); 1354} 1355 1356void 1357dsl_dir_snap_cmtime_update(dsl_dir_t *dd) 1358{ 1359 timestruc_t t; 1360 1361 gethrestime(&t); 1362 mutex_enter(&dd->dd_lock); 1363 dd->dd_snap_cmtime = t; 1364 mutex_exit(&dd->dd_lock); 1365} 1366