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 2007 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_objset.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/dmu_traverse.h> 34 #include <sys/dmu_tx.h> 35 #include <sys/arc.h> 36 #include <sys/zio.h> 37 #include <sys/zap.h> 38 #include <sys/unique.h> 39 #include <sys/zfs_context.h> 40 #include <sys/zfs_ioctl.h> 41 #include <sys/spa.h> 42 #include <sys/sunddi.h> 43 44 static dsl_checkfunc_t dsl_dataset_destroy_begin_check; 45 static dsl_syncfunc_t dsl_dataset_destroy_begin_sync; 46 static dsl_checkfunc_t dsl_dataset_rollback_check; 47 static dsl_syncfunc_t dsl_dataset_rollback_sync; 48 static dsl_checkfunc_t dsl_dataset_destroy_check; 49 static dsl_syncfunc_t dsl_dataset_destroy_sync; 50 51 #define DS_REF_MAX (1ULL << 62) 52 53 #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE 54 55 /* 56 * We use weighted reference counts to express the various forms of exclusion 57 * between different open modes. A STANDARD open is 1 point, an EXCLUSIVE open 58 * is DS_REF_MAX, and a PRIMARY open is little more than half of an EXCLUSIVE. 59 * This makes the exclusion logic simple: the total refcnt for all opens cannot 60 * exceed DS_REF_MAX. For example, EXCLUSIVE opens are exclusive because their 61 * weight (DS_REF_MAX) consumes the entire refcnt space. PRIMARY opens consume 62 * just over half of the refcnt space, so there can't be more than one, but it 63 * can peacefully coexist with any number of STANDARD opens. 64 */ 65 static uint64_t ds_refcnt_weight[DS_MODE_LEVELS] = { 66 0, /* DS_MODE_NONE - invalid */ 67 1, /* DS_MODE_STANDARD - unlimited number */ 68 (DS_REF_MAX >> 1) + 1, /* DS_MODE_PRIMARY - only one of these */ 69 DS_REF_MAX /* DS_MODE_EXCLUSIVE - no other opens */ 70 }; 71 72 73 void 74 dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 75 { 76 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); 77 int compressed = BP_GET_PSIZE(bp); 78 int uncompressed = BP_GET_UCSIZE(bp); 79 80 dprintf_bp(bp, "born, ds=%p\n", ds); 81 82 ASSERT(dmu_tx_is_syncing(tx)); 83 /* It could have been compressed away to nothing */ 84 if (BP_IS_HOLE(bp)) 85 return; 86 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 87 ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES); 88 if (ds == NULL) { 89 /* 90 * Account for the meta-objset space in its placeholder 91 * dsl_dir. 92 */ 93 ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */ 94 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, 95 used, compressed, uncompressed, tx); 96 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); 97 return; 98 } 99 dmu_buf_will_dirty(ds->ds_dbuf, tx); 100 mutex_enter(&ds->ds_lock); 101 ds->ds_phys->ds_used_bytes += used; 102 ds->ds_phys->ds_compressed_bytes += compressed; 103 ds->ds_phys->ds_uncompressed_bytes += uncompressed; 104 ds->ds_phys->ds_unique_bytes += used; 105 mutex_exit(&ds->ds_lock); 106 dsl_dir_diduse_space(ds->ds_dir, 107 used, compressed, uncompressed, tx); 108 } 109 110 void 111 dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, zio_t *pio, 112 dmu_tx_t *tx) 113 { 114 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); 115 int compressed = BP_GET_PSIZE(bp); 116 int uncompressed = BP_GET_UCSIZE(bp); 117 118 ASSERT(dmu_tx_is_syncing(tx)); 119 /* No block pointer => nothing to free */ 120 if (BP_IS_HOLE(bp)) 121 return; 122 123 ASSERT(used > 0); 124 if (ds == NULL) { 125 int err; 126 /* 127 * Account for the meta-objset space in its placeholder 128 * dataset. 129 */ 130 err = arc_free(pio, tx->tx_pool->dp_spa, 131 tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT); 132 ASSERT(err == 0); 133 134 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, 135 -used, -compressed, -uncompressed, tx); 136 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); 137 return; 138 } 139 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 140 141 dmu_buf_will_dirty(ds->ds_dbuf, tx); 142 143 if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { 144 int err; 145 146 dprintf_bp(bp, "freeing: %s", ""); 147 err = arc_free(pio, tx->tx_pool->dp_spa, 148 tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT); 149 ASSERT(err == 0); 150 151 mutex_enter(&ds->ds_lock); 152 /* XXX unique_bytes is not accurate for head datasets */ 153 /* ASSERT3U(ds->ds_phys->ds_unique_bytes, >=, used); */ 154 ds->ds_phys->ds_unique_bytes -= used; 155 mutex_exit(&ds->ds_lock); 156 dsl_dir_diduse_space(ds->ds_dir, 157 -used, -compressed, -uncompressed, tx); 158 } else { 159 dprintf_bp(bp, "putting on dead list: %s", ""); 160 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx)); 161 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 162 if (ds->ds_phys->ds_prev_snap_obj != 0) { 163 ASSERT3U(ds->ds_prev->ds_object, ==, 164 ds->ds_phys->ds_prev_snap_obj); 165 ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); 166 if (ds->ds_prev->ds_phys->ds_next_snap_obj == 167 ds->ds_object && bp->blk_birth > 168 ds->ds_prev->ds_phys->ds_prev_snap_txg) { 169 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 170 mutex_enter(&ds->ds_prev->ds_lock); 171 ds->ds_prev->ds_phys->ds_unique_bytes += 172 used; 173 mutex_exit(&ds->ds_prev->ds_lock); 174 } 175 } 176 } 177 mutex_enter(&ds->ds_lock); 178 ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used); 179 ds->ds_phys->ds_used_bytes -= used; 180 ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); 181 ds->ds_phys->ds_compressed_bytes -= compressed; 182 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); 183 ds->ds_phys->ds_uncompressed_bytes -= uncompressed; 184 mutex_exit(&ds->ds_lock); 185 } 186 187 uint64_t 188 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 189 { 190 uint64_t trysnap = 0; 191 192 if (ds == NULL) 193 return (0); 194 /* 195 * The snapshot creation could fail, but that would cause an 196 * incorrect FALSE return, which would only result in an 197 * overestimation of the amount of space that an operation would 198 * consume, which is OK. 199 * 200 * There's also a small window where we could miss a pending 201 * snapshot, because we could set the sync task in the quiescing 202 * phase. So this should only be used as a guess. 203 */ 204 if (ds->ds_trysnap_txg > 205 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 206 trysnap = ds->ds_trysnap_txg; 207 return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); 208 } 209 210 int 211 dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) 212 { 213 return (blk_birth > dsl_dataset_prev_snap_txg(ds)); 214 } 215 216 /* ARGSUSED */ 217 static void 218 dsl_dataset_evict(dmu_buf_t *db, void *dsv) 219 { 220 dsl_dataset_t *ds = dsv; 221 222 /* open_refcount == DS_REF_MAX when deleting */ 223 ASSERT(ds->ds_open_refcount == 0 || 224 ds->ds_open_refcount == DS_REF_MAX); 225 226 dprintf_ds(ds, "evicting %s\n", ""); 227 228 unique_remove(ds->ds_fsid_guid); 229 230 if (ds->ds_user_ptr != NULL) 231 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 232 233 if (ds->ds_prev) { 234 dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); 235 ds->ds_prev = NULL; 236 } 237 238 bplist_close(&ds->ds_deadlist); 239 dsl_dir_close(ds->ds_dir, ds); 240 241 ASSERT(!list_link_active(&ds->ds_synced_link)); 242 243 mutex_destroy(&ds->ds_lock); 244 mutex_destroy(&ds->ds_opening_lock); 245 mutex_destroy(&ds->ds_deadlist.bpl_lock); 246 247 kmem_free(ds, sizeof (dsl_dataset_t)); 248 } 249 250 static int 251 dsl_dataset_get_snapname(dsl_dataset_t *ds) 252 { 253 dsl_dataset_phys_t *headphys; 254 int err; 255 dmu_buf_t *headdbuf; 256 dsl_pool_t *dp = ds->ds_dir->dd_pool; 257 objset_t *mos = dp->dp_meta_objset; 258 259 if (ds->ds_snapname[0]) 260 return (0); 261 if (ds->ds_phys->ds_next_snap_obj == 0) 262 return (0); 263 264 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, 265 FTAG, &headdbuf); 266 if (err) 267 return (err); 268 headphys = headdbuf->db_data; 269 err = zap_value_search(dp->dp_meta_objset, 270 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 271 dmu_buf_rele(headdbuf, FTAG); 272 return (err); 273 } 274 275 int 276 dsl_dataset_open_obj(dsl_pool_t *dp, uint64_t dsobj, const char *snapname, 277 int mode, void *tag, dsl_dataset_t **dsp) 278 { 279 uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; 280 objset_t *mos = dp->dp_meta_objset; 281 dmu_buf_t *dbuf; 282 dsl_dataset_t *ds; 283 int err; 284 285 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || 286 dsl_pool_sync_context(dp)); 287 288 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 289 if (err) 290 return (err); 291 ds = dmu_buf_get_user(dbuf); 292 if (ds == NULL) { 293 dsl_dataset_t *winner; 294 295 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 296 ds->ds_dbuf = dbuf; 297 ds->ds_object = dsobj; 298 ds->ds_phys = dbuf->db_data; 299 300 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 301 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 302 mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, 303 NULL); 304 305 err = bplist_open(&ds->ds_deadlist, 306 mos, ds->ds_phys->ds_deadlist_obj); 307 if (err == 0) { 308 err = dsl_dir_open_obj(dp, 309 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); 310 } 311 if (err) { 312 /* 313 * we don't really need to close the blist if we 314 * just opened it. 315 */ 316 mutex_destroy(&ds->ds_lock); 317 mutex_destroy(&ds->ds_opening_lock); 318 mutex_destroy(&ds->ds_deadlist.bpl_lock); 319 kmem_free(ds, sizeof (dsl_dataset_t)); 320 dmu_buf_rele(dbuf, tag); 321 return (err); 322 } 323 324 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == dsobj) { 325 ds->ds_snapname[0] = '\0'; 326 if (ds->ds_phys->ds_prev_snap_obj) { 327 err = dsl_dataset_open_obj(dp, 328 ds->ds_phys->ds_prev_snap_obj, NULL, 329 DS_MODE_NONE, ds, &ds->ds_prev); 330 } 331 } else { 332 if (snapname) { 333 #ifdef ZFS_DEBUG 334 dsl_dataset_phys_t *headphys; 335 dmu_buf_t *headdbuf; 336 err = dmu_bonus_hold(mos, 337 ds->ds_dir->dd_phys->dd_head_dataset_obj, 338 FTAG, &headdbuf); 339 if (err == 0) { 340 headphys = headdbuf->db_data; 341 uint64_t foundobj; 342 err = zap_lookup(dp->dp_meta_objset, 343 headphys->ds_snapnames_zapobj, 344 snapname, sizeof (foundobj), 1, 345 &foundobj); 346 ASSERT3U(foundobj, ==, dsobj); 347 dmu_buf_rele(headdbuf, FTAG); 348 } 349 #endif 350 (void) strcat(ds->ds_snapname, snapname); 351 } else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) { 352 err = dsl_dataset_get_snapname(ds); 353 } 354 } 355 356 if (err == 0) { 357 winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, 358 dsl_dataset_evict); 359 } 360 if (err || winner) { 361 bplist_close(&ds->ds_deadlist); 362 if (ds->ds_prev) { 363 dsl_dataset_close(ds->ds_prev, 364 DS_MODE_NONE, ds); 365 } 366 dsl_dir_close(ds->ds_dir, ds); 367 mutex_destroy(&ds->ds_lock); 368 mutex_destroy(&ds->ds_opening_lock); 369 mutex_destroy(&ds->ds_deadlist.bpl_lock); 370 kmem_free(ds, sizeof (dsl_dataset_t)); 371 if (err) { 372 dmu_buf_rele(dbuf, tag); 373 return (err); 374 } 375 ds = winner; 376 } else { 377 ds->ds_fsid_guid = 378 unique_insert(ds->ds_phys->ds_fsid_guid); 379 } 380 } 381 ASSERT3P(ds->ds_dbuf, ==, dbuf); 382 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); 383 384 mutex_enter(&ds->ds_lock); 385 if ((DS_MODE_LEVEL(mode) == DS_MODE_PRIMARY && 386 (ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) && 387 !DS_MODE_IS_INCONSISTENT(mode)) || 388 (ds->ds_open_refcount + weight > DS_REF_MAX)) { 389 mutex_exit(&ds->ds_lock); 390 dsl_dataset_close(ds, DS_MODE_NONE, tag); 391 return (EBUSY); 392 } 393 ds->ds_open_refcount += weight; 394 mutex_exit(&ds->ds_lock); 395 396 *dsp = ds; 397 return (0); 398 } 399 400 int 401 dsl_dataset_open_spa(spa_t *spa, const char *name, int mode, 402 void *tag, dsl_dataset_t **dsp) 403 { 404 dsl_dir_t *dd; 405 dsl_pool_t *dp; 406 const char *tail; 407 uint64_t obj; 408 dsl_dataset_t *ds = NULL; 409 int err = 0; 410 411 err = dsl_dir_open_spa(spa, name, FTAG, &dd, &tail); 412 if (err) 413 return (err); 414 415 dp = dd->dd_pool; 416 obj = dd->dd_phys->dd_head_dataset_obj; 417 rw_enter(&dp->dp_config_rwlock, RW_READER); 418 if (obj == 0) { 419 /* A dataset with no associated objset */ 420 err = ENOENT; 421 goto out; 422 } 423 424 if (tail != NULL) { 425 objset_t *mos = dp->dp_meta_objset; 426 427 err = dsl_dataset_open_obj(dp, obj, NULL, 428 DS_MODE_NONE, tag, &ds); 429 if (err) 430 goto out; 431 obj = ds->ds_phys->ds_snapnames_zapobj; 432 dsl_dataset_close(ds, DS_MODE_NONE, tag); 433 ds = NULL; 434 435 if (tail[0] != '@') { 436 err = ENOENT; 437 goto out; 438 } 439 tail++; 440 441 /* Look for a snapshot */ 442 if (!DS_MODE_IS_READONLY(mode)) { 443 err = EROFS; 444 goto out; 445 } 446 dprintf("looking for snapshot '%s'\n", tail); 447 err = zap_lookup(mos, obj, tail, 8, 1, &obj); 448 if (err) 449 goto out; 450 } 451 err = dsl_dataset_open_obj(dp, obj, tail, mode, tag, &ds); 452 453 out: 454 rw_exit(&dp->dp_config_rwlock); 455 dsl_dir_close(dd, FTAG); 456 457 ASSERT3U((err == 0), ==, (ds != NULL)); 458 /* ASSERT(ds == NULL || strcmp(name, ds->ds_name) == 0); */ 459 460 *dsp = ds; 461 return (err); 462 } 463 464 int 465 dsl_dataset_open(const char *name, int mode, void *tag, dsl_dataset_t **dsp) 466 { 467 return (dsl_dataset_open_spa(NULL, name, mode, tag, dsp)); 468 } 469 470 void 471 dsl_dataset_name(dsl_dataset_t *ds, char *name) 472 { 473 if (ds == NULL) { 474 (void) strcpy(name, "mos"); 475 } else { 476 dsl_dir_name(ds->ds_dir, name); 477 VERIFY(0 == dsl_dataset_get_snapname(ds)); 478 if (ds->ds_snapname[0]) { 479 (void) strcat(name, "@"); 480 if (!MUTEX_HELD(&ds->ds_lock)) { 481 /* 482 * We use a "recursive" mutex so that we 483 * can call dprintf_ds() with ds_lock held. 484 */ 485 mutex_enter(&ds->ds_lock); 486 (void) strcat(name, ds->ds_snapname); 487 mutex_exit(&ds->ds_lock); 488 } else { 489 (void) strcat(name, ds->ds_snapname); 490 } 491 } 492 } 493 } 494 495 static int 496 dsl_dataset_namelen(dsl_dataset_t *ds) 497 { 498 int result; 499 500 if (ds == NULL) { 501 result = 3; /* "mos" */ 502 } else { 503 result = dsl_dir_namelen(ds->ds_dir); 504 VERIFY(0 == dsl_dataset_get_snapname(ds)); 505 if (ds->ds_snapname[0]) { 506 ++result; /* adding one for the @-sign */ 507 if (!MUTEX_HELD(&ds->ds_lock)) { 508 /* see dsl_datset_name */ 509 mutex_enter(&ds->ds_lock); 510 result += strlen(ds->ds_snapname); 511 mutex_exit(&ds->ds_lock); 512 } else { 513 result += strlen(ds->ds_snapname); 514 } 515 } 516 } 517 518 return (result); 519 } 520 521 void 522 dsl_dataset_close(dsl_dataset_t *ds, int mode, void *tag) 523 { 524 uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)]; 525 mutex_enter(&ds->ds_lock); 526 ASSERT3U(ds->ds_open_refcount, >=, weight); 527 ds->ds_open_refcount -= weight; 528 dprintf_ds(ds, "closing mode %u refcount now 0x%llx\n", 529 mode, ds->ds_open_refcount); 530 mutex_exit(&ds->ds_lock); 531 532 dmu_buf_rele(ds->ds_dbuf, tag); 533 } 534 535 void 536 dsl_dataset_create_root(dsl_pool_t *dp, uint64_t *ddobjp, dmu_tx_t *tx) 537 { 538 objset_t *mos = dp->dp_meta_objset; 539 dmu_buf_t *dbuf; 540 dsl_dataset_phys_t *dsphys; 541 dsl_dataset_t *ds; 542 uint64_t dsobj; 543 dsl_dir_t *dd; 544 545 dsl_dir_create_root(mos, ddobjp, tx); 546 VERIFY(0 == dsl_dir_open_obj(dp, *ddobjp, NULL, FTAG, &dd)); 547 548 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 549 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 550 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 551 dmu_buf_will_dirty(dbuf, tx); 552 dsphys = dbuf->db_data; 553 dsphys->ds_dir_obj = dd->dd_object; 554 dsphys->ds_fsid_guid = unique_create(); 555 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 556 sizeof (dsphys->ds_guid)); 557 dsphys->ds_snapnames_zapobj = 558 zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); 559 dsphys->ds_creation_time = gethrestime_sec(); 560 dsphys->ds_creation_txg = tx->tx_txg; 561 dsphys->ds_deadlist_obj = 562 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 563 dmu_buf_rele(dbuf, FTAG); 564 565 dmu_buf_will_dirty(dd->dd_dbuf, tx); 566 dd->dd_phys->dd_head_dataset_obj = dsobj; 567 dsl_dir_close(dd, FTAG); 568 569 VERIFY(0 == 570 dsl_dataset_open_obj(dp, dsobj, NULL, DS_MODE_NONE, FTAG, &ds)); 571 (void) dmu_objset_create_impl(dp->dp_spa, ds, 572 &ds->ds_phys->ds_bp, DMU_OST_ZFS, tx); 573 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); 574 } 575 576 uint64_t 577 dsl_dataset_create_sync(dsl_dir_t *pdd, 578 const char *lastname, dsl_dataset_t *clone_parent, dmu_tx_t *tx) 579 { 580 dsl_pool_t *dp = pdd->dd_pool; 581 dmu_buf_t *dbuf; 582 dsl_dataset_phys_t *dsphys; 583 uint64_t dsobj, ddobj; 584 objset_t *mos = dp->dp_meta_objset; 585 dsl_dir_t *dd; 586 587 ASSERT(clone_parent == NULL || clone_parent->ds_dir->dd_pool == dp); 588 ASSERT(clone_parent == NULL || 589 clone_parent->ds_phys->ds_num_children > 0); 590 ASSERT(lastname[0] != '@'); 591 ASSERT(dmu_tx_is_syncing(tx)); 592 593 ddobj = dsl_dir_create_sync(pdd, lastname, tx); 594 VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); 595 596 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 597 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 598 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 599 dmu_buf_will_dirty(dbuf, tx); 600 dsphys = dbuf->db_data; 601 dsphys->ds_dir_obj = dd->dd_object; 602 dsphys->ds_fsid_guid = unique_create(); 603 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 604 sizeof (dsphys->ds_guid)); 605 dsphys->ds_snapnames_zapobj = 606 zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx); 607 dsphys->ds_creation_time = gethrestime_sec(); 608 dsphys->ds_creation_txg = tx->tx_txg; 609 dsphys->ds_deadlist_obj = 610 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 611 if (clone_parent) { 612 dsphys->ds_prev_snap_obj = clone_parent->ds_object; 613 dsphys->ds_prev_snap_txg = 614 clone_parent->ds_phys->ds_creation_txg; 615 dsphys->ds_used_bytes = 616 clone_parent->ds_phys->ds_used_bytes; 617 dsphys->ds_compressed_bytes = 618 clone_parent->ds_phys->ds_compressed_bytes; 619 dsphys->ds_uncompressed_bytes = 620 clone_parent->ds_phys->ds_uncompressed_bytes; 621 dsphys->ds_bp = clone_parent->ds_phys->ds_bp; 622 623 dmu_buf_will_dirty(clone_parent->ds_dbuf, tx); 624 clone_parent->ds_phys->ds_num_children++; 625 626 dmu_buf_will_dirty(dd->dd_dbuf, tx); 627 dd->dd_phys->dd_clone_parent_obj = clone_parent->ds_object; 628 } 629 dmu_buf_rele(dbuf, FTAG); 630 631 dmu_buf_will_dirty(dd->dd_dbuf, tx); 632 dd->dd_phys->dd_head_dataset_obj = dsobj; 633 dsl_dir_close(dd, FTAG); 634 635 return (dsobj); 636 } 637 638 struct destroyarg { 639 dsl_sync_task_group_t *dstg; 640 char *snapname; 641 char *failed; 642 }; 643 644 static int 645 dsl_snapshot_destroy_one(char *name, void *arg) 646 { 647 struct destroyarg *da = arg; 648 dsl_dataset_t *ds; 649 char *cp; 650 int err; 651 652 (void) strcat(name, "@"); 653 (void) strcat(name, da->snapname); 654 err = dsl_dataset_open(name, 655 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, 656 da->dstg, &ds); 657 cp = strchr(name, '@'); 658 *cp = '\0'; 659 if (err == ENOENT) 660 return (0); 661 if (err) { 662 (void) strcpy(da->failed, name); 663 return (err); 664 } 665 666 dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, 667 dsl_dataset_destroy_sync, ds, da->dstg, 0); 668 return (0); 669 } 670 671 /* 672 * Destroy 'snapname' in all descendants of 'fsname'. 673 */ 674 #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy 675 int 676 dsl_snapshots_destroy(char *fsname, char *snapname) 677 { 678 int err; 679 struct destroyarg da; 680 dsl_sync_task_t *dst; 681 spa_t *spa; 682 683 err = spa_open(fsname, &spa, FTAG); 684 if (err) 685 return (err); 686 da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 687 da.snapname = snapname; 688 da.failed = fsname; 689 690 err = dmu_objset_find(fsname, 691 dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); 692 693 if (err == 0) 694 err = dsl_sync_task_group_wait(da.dstg); 695 696 for (dst = list_head(&da.dstg->dstg_tasks); dst; 697 dst = list_next(&da.dstg->dstg_tasks, dst)) { 698 dsl_dataset_t *ds = dst->dst_arg1; 699 if (dst->dst_err) { 700 dsl_dataset_name(ds, fsname); 701 *strchr(fsname, '@') = '\0'; 702 } 703 /* 704 * If it was successful, destroy_sync would have 705 * closed the ds 706 */ 707 if (err) 708 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, da.dstg); 709 } 710 711 dsl_sync_task_group_destroy(da.dstg); 712 spa_close(spa, FTAG); 713 return (err); 714 } 715 716 int 717 dsl_dataset_destroy(const char *name) 718 { 719 int err; 720 dsl_sync_task_group_t *dstg; 721 objset_t *os; 722 dsl_dataset_t *ds; 723 dsl_dir_t *dd; 724 uint64_t obj; 725 726 if (strchr(name, '@')) { 727 /* Destroying a snapshot is simpler */ 728 err = dsl_dataset_open(name, 729 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, 730 FTAG, &ds); 731 if (err) 732 return (err); 733 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 734 dsl_dataset_destroy_check, dsl_dataset_destroy_sync, 735 ds, FTAG, 0); 736 if (err) 737 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 738 return (err); 739 } 740 741 err = dmu_objset_open(name, DMU_OST_ANY, 742 DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, &os); 743 if (err) 744 return (err); 745 ds = os->os->os_dsl_dataset; 746 dd = ds->ds_dir; 747 748 /* 749 * Check for errors and mark this ds as inconsistent, in 750 * case we crash while freeing the objects. 751 */ 752 err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, 753 dsl_dataset_destroy_begin_sync, ds, NULL, 0); 754 if (err) { 755 dmu_objset_close(os); 756 return (err); 757 } 758 759 /* 760 * remove the objects in open context, so that we won't 761 * have too much to do in syncing context. 762 */ 763 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 764 ds->ds_phys->ds_prev_snap_txg)) { 765 dmu_tx_t *tx = dmu_tx_create(os); 766 dmu_tx_hold_free(tx, obj, 0, DMU_OBJECT_END); 767 dmu_tx_hold_bonus(tx, obj); 768 err = dmu_tx_assign(tx, TXG_WAIT); 769 if (err) { 770 /* 771 * Perhaps there is not enough disk 772 * space. Just deal with it from 773 * dsl_dataset_destroy_sync(). 774 */ 775 dmu_tx_abort(tx); 776 continue; 777 } 778 VERIFY(0 == dmu_object_free(os, obj, tx)); 779 dmu_tx_commit(tx); 780 } 781 /* Make sure it's not dirty before we finish destroying it. */ 782 txg_wait_synced(dd->dd_pool, 0); 783 784 dmu_objset_close(os); 785 if (err != ESRCH) 786 return (err); 787 788 err = dsl_dataset_open(name, 789 DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT, 790 FTAG, &ds); 791 if (err) 792 return (err); 793 794 err = dsl_dir_open(name, FTAG, &dd, NULL); 795 if (err) { 796 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 797 return (err); 798 } 799 800 /* 801 * Blow away the dsl_dir + head dataset. 802 */ 803 dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool); 804 dsl_sync_task_create(dstg, dsl_dataset_destroy_check, 805 dsl_dataset_destroy_sync, ds, FTAG, 0); 806 dsl_sync_task_create(dstg, dsl_dir_destroy_check, 807 dsl_dir_destroy_sync, dd, FTAG, 0); 808 err = dsl_sync_task_group_wait(dstg); 809 dsl_sync_task_group_destroy(dstg); 810 /* if it is successful, *destroy_sync will close the ds+dd */ 811 if (err) { 812 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 813 dsl_dir_close(dd, FTAG); 814 } 815 return (err); 816 } 817 818 int 819 dsl_dataset_rollback(dsl_dataset_t *ds) 820 { 821 ASSERT3U(ds->ds_open_refcount, ==, DS_REF_MAX); 822 return (dsl_sync_task_do(ds->ds_dir->dd_pool, 823 dsl_dataset_rollback_check, dsl_dataset_rollback_sync, 824 ds, NULL, 0)); 825 } 826 827 void * 828 dsl_dataset_set_user_ptr(dsl_dataset_t *ds, 829 void *p, dsl_dataset_evict_func_t func) 830 { 831 void *old; 832 833 mutex_enter(&ds->ds_lock); 834 old = ds->ds_user_ptr; 835 if (old == NULL) { 836 ds->ds_user_ptr = p; 837 ds->ds_user_evict_func = func; 838 } 839 mutex_exit(&ds->ds_lock); 840 return (old); 841 } 842 843 void * 844 dsl_dataset_get_user_ptr(dsl_dataset_t *ds) 845 { 846 return (ds->ds_user_ptr); 847 } 848 849 850 blkptr_t * 851 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 852 { 853 return (&ds->ds_phys->ds_bp); 854 } 855 856 void 857 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 858 { 859 ASSERT(dmu_tx_is_syncing(tx)); 860 /* If it's the meta-objset, set dp_meta_rootbp */ 861 if (ds == NULL) { 862 tx->tx_pool->dp_meta_rootbp = *bp; 863 } else { 864 dmu_buf_will_dirty(ds->ds_dbuf, tx); 865 ds->ds_phys->ds_bp = *bp; 866 } 867 } 868 869 spa_t * 870 dsl_dataset_get_spa(dsl_dataset_t *ds) 871 { 872 return (ds->ds_dir->dd_pool->dp_spa); 873 } 874 875 void 876 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 877 { 878 dsl_pool_t *dp; 879 880 if (ds == NULL) /* this is the meta-objset */ 881 return; 882 883 ASSERT(ds->ds_user_ptr != NULL); 884 885 if (ds->ds_phys->ds_next_snap_obj != 0) 886 panic("dirtying snapshot!"); 887 888 dp = ds->ds_dir->dd_pool; 889 890 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { 891 /* up the hold count until we can be written out */ 892 dmu_buf_add_ref(ds->ds_dbuf, ds); 893 } 894 } 895 896 struct killarg { 897 uint64_t *usedp; 898 uint64_t *compressedp; 899 uint64_t *uncompressedp; 900 zio_t *zio; 901 dmu_tx_t *tx; 902 }; 903 904 static int 905 kill_blkptr(traverse_blk_cache_t *bc, spa_t *spa, void *arg) 906 { 907 struct killarg *ka = arg; 908 blkptr_t *bp = &bc->bc_blkptr; 909 910 ASSERT3U(bc->bc_errno, ==, 0); 911 912 /* 913 * Since this callback is not called concurrently, no lock is 914 * needed on the accounting values. 915 */ 916 *ka->usedp += bp_get_dasize(spa, bp); 917 *ka->compressedp += BP_GET_PSIZE(bp); 918 *ka->uncompressedp += BP_GET_UCSIZE(bp); 919 /* XXX check for EIO? */ 920 (void) arc_free(ka->zio, spa, ka->tx->tx_txg, bp, NULL, NULL, 921 ARC_NOWAIT); 922 return (0); 923 } 924 925 /* ARGSUSED */ 926 static int 927 dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) 928 { 929 dsl_dataset_t *ds = arg1; 930 931 /* 932 * There must be a previous snapshot. I suppose we could roll 933 * it back to being empty (and re-initialize the upper (ZPL) 934 * layer). But for now there's no way to do this via the user 935 * interface. 936 */ 937 if (ds->ds_phys->ds_prev_snap_txg == 0) 938 return (EINVAL); 939 940 /* 941 * This must not be a snapshot. 942 */ 943 if (ds->ds_phys->ds_next_snap_obj != 0) 944 return (EINVAL); 945 946 /* 947 * If we made changes this txg, traverse_dsl_dataset won't find 948 * them. Try again. 949 */ 950 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 951 return (EAGAIN); 952 953 return (0); 954 } 955 956 /* ARGSUSED */ 957 static void 958 dsl_dataset_rollback_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 959 { 960 dsl_dataset_t *ds = arg1; 961 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 962 963 dmu_buf_will_dirty(ds->ds_dbuf, tx); 964 965 /* Before the roll back destroy the zil */ 966 zil_rollback_destroy(((objset_impl_t *)ds->ds_user_ptr)->os_zil, tx); 967 968 /* Zero out the deadlist. */ 969 bplist_close(&ds->ds_deadlist); 970 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 971 ds->ds_phys->ds_deadlist_obj = 972 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 973 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 974 ds->ds_phys->ds_deadlist_obj)); 975 976 { 977 /* Free blkptrs that we gave birth to */ 978 zio_t *zio; 979 uint64_t used = 0, compressed = 0, uncompressed = 0; 980 struct killarg ka; 981 982 zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, 983 ZIO_FLAG_MUSTSUCCEED); 984 ka.usedp = &used; 985 ka.compressedp = &compressed; 986 ka.uncompressedp = &uncompressed; 987 ka.zio = zio; 988 ka.tx = tx; 989 (void) traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 990 ADVANCE_POST, kill_blkptr, &ka); 991 (void) zio_wait(zio); 992 993 dsl_dir_diduse_space(ds->ds_dir, 994 -used, -compressed, -uncompressed, tx); 995 } 996 997 /* Change our contents to that of the prev snapshot */ 998 ASSERT3U(ds->ds_prev->ds_object, ==, ds->ds_phys->ds_prev_snap_obj); 999 ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; 1000 ds->ds_phys->ds_used_bytes = ds->ds_prev->ds_phys->ds_used_bytes; 1001 ds->ds_phys->ds_compressed_bytes = 1002 ds->ds_prev->ds_phys->ds_compressed_bytes; 1003 ds->ds_phys->ds_uncompressed_bytes = 1004 ds->ds_prev->ds_phys->ds_uncompressed_bytes; 1005 ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; 1006 ds->ds_phys->ds_unique_bytes = 0; 1007 1008 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1009 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1010 ds->ds_prev->ds_phys->ds_unique_bytes = 0; 1011 } 1012 1013 spa_history_internal_log(LOG_DS_ROLLBACK, ds->ds_dir->dd_pool->dp_spa, 1014 tx, cr, "dataset = %llu", ds->ds_object); 1015 } 1016 1017 /* ARGSUSED */ 1018 static int 1019 dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) 1020 { 1021 dsl_dataset_t *ds = arg1; 1022 1023 /* 1024 * Can't delete a head dataset if there are snapshots of it. 1025 * (Except if the only snapshots are from the branch we cloned 1026 * from.) 1027 */ 1028 if (ds->ds_prev != NULL && 1029 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 1030 return (EINVAL); 1031 1032 return (0); 1033 } 1034 1035 /* ARGSUSED */ 1036 static void 1037 dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1038 { 1039 dsl_dataset_t *ds = arg1; 1040 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1041 1042 /* Mark it as inconsistent on-disk, in case we crash */ 1043 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1044 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 1045 1046 spa_history_internal_log(LOG_DS_DESTROY_BEGIN, dp->dp_spa, tx, 1047 cr, "dataset = %llu", ds->ds_object); 1048 } 1049 1050 /* ARGSUSED */ 1051 static int 1052 dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) 1053 { 1054 dsl_dataset_t *ds = arg1; 1055 1056 /* Can't delete a branch point. */ 1057 if (ds->ds_phys->ds_num_children > 1) 1058 return (EEXIST); 1059 1060 /* 1061 * Can't delete a head dataset if there are snapshots of it. 1062 * (Except if the only snapshots are from the branch we cloned 1063 * from.) 1064 */ 1065 if (ds->ds_prev != NULL && 1066 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 1067 return (EINVAL); 1068 1069 /* 1070 * If we made changes this txg, traverse_dsl_dataset won't find 1071 * them. Try again. 1072 */ 1073 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 1074 return (EAGAIN); 1075 1076 /* XXX we should do some i/o error checking... */ 1077 return (0); 1078 } 1079 1080 static void 1081 dsl_dataset_destroy_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx) 1082 { 1083 dsl_dataset_t *ds = arg1; 1084 uint64_t used = 0, compressed = 0, uncompressed = 0; 1085 zio_t *zio; 1086 int err; 1087 int after_branch_point = FALSE; 1088 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1089 objset_t *mos = dp->dp_meta_objset; 1090 dsl_dataset_t *ds_prev = NULL; 1091 uint64_t obj; 1092 1093 ASSERT3U(ds->ds_open_refcount, ==, DS_REF_MAX); 1094 ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); 1095 ASSERT(ds->ds_prev == NULL || 1096 ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); 1097 ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); 1098 1099 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 1100 1101 obj = ds->ds_object; 1102 1103 if (ds->ds_phys->ds_prev_snap_obj != 0) { 1104 if (ds->ds_prev) { 1105 ds_prev = ds->ds_prev; 1106 } else { 1107 VERIFY(0 == dsl_dataset_open_obj(dp, 1108 ds->ds_phys->ds_prev_snap_obj, NULL, 1109 DS_MODE_NONE, FTAG, &ds_prev)); 1110 } 1111 after_branch_point = 1112 (ds_prev->ds_phys->ds_next_snap_obj != obj); 1113 1114 dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); 1115 if (after_branch_point && 1116 ds->ds_phys->ds_next_snap_obj == 0) { 1117 /* This clone is toast. */ 1118 ASSERT(ds_prev->ds_phys->ds_num_children > 1); 1119 ds_prev->ds_phys->ds_num_children--; 1120 } else if (!after_branch_point) { 1121 ds_prev->ds_phys->ds_next_snap_obj = 1122 ds->ds_phys->ds_next_snap_obj; 1123 } 1124 } 1125 1126 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1127 1128 if (ds->ds_phys->ds_next_snap_obj != 0) { 1129 blkptr_t bp; 1130 dsl_dataset_t *ds_next; 1131 uint64_t itor = 0; 1132 1133 spa_scrub_restart(dp->dp_spa, tx->tx_txg); 1134 1135 VERIFY(0 == dsl_dataset_open_obj(dp, 1136 ds->ds_phys->ds_next_snap_obj, NULL, 1137 DS_MODE_NONE, FTAG, &ds_next)); 1138 ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); 1139 1140 dmu_buf_will_dirty(ds_next->ds_dbuf, tx); 1141 ds_next->ds_phys->ds_prev_snap_obj = 1142 ds->ds_phys->ds_prev_snap_obj; 1143 ds_next->ds_phys->ds_prev_snap_txg = 1144 ds->ds_phys->ds_prev_snap_txg; 1145 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1146 ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); 1147 1148 /* 1149 * Transfer to our deadlist (which will become next's 1150 * new deadlist) any entries from next's current 1151 * deadlist which were born before prev, and free the 1152 * other entries. 1153 * 1154 * XXX we're doing this long task with the config lock held 1155 */ 1156 while (bplist_iterate(&ds_next->ds_deadlist, &itor, 1157 &bp) == 0) { 1158 if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { 1159 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, 1160 &bp, tx)); 1161 if (ds_prev && !after_branch_point && 1162 bp.blk_birth > 1163 ds_prev->ds_phys->ds_prev_snap_txg) { 1164 ds_prev->ds_phys->ds_unique_bytes += 1165 bp_get_dasize(dp->dp_spa, &bp); 1166 } 1167 } else { 1168 used += bp_get_dasize(dp->dp_spa, &bp); 1169 compressed += BP_GET_PSIZE(&bp); 1170 uncompressed += BP_GET_UCSIZE(&bp); 1171 /* XXX check return value? */ 1172 (void) arc_free(zio, dp->dp_spa, tx->tx_txg, 1173 &bp, NULL, NULL, ARC_NOWAIT); 1174 } 1175 } 1176 1177 /* free next's deadlist */ 1178 bplist_close(&ds_next->ds_deadlist); 1179 bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); 1180 1181 /* set next's deadlist to our deadlist */ 1182 ds_next->ds_phys->ds_deadlist_obj = 1183 ds->ds_phys->ds_deadlist_obj; 1184 VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, 1185 ds_next->ds_phys->ds_deadlist_obj)); 1186 ds->ds_phys->ds_deadlist_obj = 0; 1187 1188 if (ds_next->ds_phys->ds_next_snap_obj != 0) { 1189 /* 1190 * Update next's unique to include blocks which 1191 * were previously shared by only this snapshot 1192 * and it. Those blocks will be born after the 1193 * prev snap and before this snap, and will have 1194 * died after the next snap and before the one 1195 * after that (ie. be on the snap after next's 1196 * deadlist). 1197 * 1198 * XXX we're doing this long task with the 1199 * config lock held 1200 */ 1201 dsl_dataset_t *ds_after_next; 1202 1203 VERIFY(0 == dsl_dataset_open_obj(dp, 1204 ds_next->ds_phys->ds_next_snap_obj, NULL, 1205 DS_MODE_NONE, FTAG, &ds_after_next)); 1206 itor = 0; 1207 while (bplist_iterate(&ds_after_next->ds_deadlist, 1208 &itor, &bp) == 0) { 1209 if (bp.blk_birth > 1210 ds->ds_phys->ds_prev_snap_txg && 1211 bp.blk_birth <= 1212 ds->ds_phys->ds_creation_txg) { 1213 ds_next->ds_phys->ds_unique_bytes += 1214 bp_get_dasize(dp->dp_spa, &bp); 1215 } 1216 } 1217 1218 dsl_dataset_close(ds_after_next, DS_MODE_NONE, FTAG); 1219 ASSERT3P(ds_next->ds_prev, ==, NULL); 1220 } else { 1221 /* 1222 * It would be nice to update the head dataset's 1223 * unique. To do so we would have to traverse 1224 * it for blocks born after ds_prev, which is 1225 * pretty expensive just to maintain something 1226 * for debugging purposes. 1227 */ 1228 ASSERT3P(ds_next->ds_prev, ==, ds); 1229 dsl_dataset_close(ds_next->ds_prev, DS_MODE_NONE, 1230 ds_next); 1231 if (ds_prev) { 1232 VERIFY(0 == dsl_dataset_open_obj(dp, 1233 ds->ds_phys->ds_prev_snap_obj, NULL, 1234 DS_MODE_NONE, ds_next, &ds_next->ds_prev)); 1235 } else { 1236 ds_next->ds_prev = NULL; 1237 } 1238 } 1239 dsl_dataset_close(ds_next, DS_MODE_NONE, FTAG); 1240 1241 /* 1242 * NB: unique_bytes is not accurate for head objsets 1243 * because we don't update it when we delete the most 1244 * recent snapshot -- see above comment. 1245 */ 1246 ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); 1247 } else { 1248 /* 1249 * There's no next snapshot, so this is a head dataset. 1250 * Destroy the deadlist. Unless it's a clone, the 1251 * deadlist should be empty. (If it's a clone, it's 1252 * safe to ignore the deadlist contents.) 1253 */ 1254 struct killarg ka; 1255 1256 ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); 1257 bplist_close(&ds->ds_deadlist); 1258 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 1259 ds->ds_phys->ds_deadlist_obj = 0; 1260 1261 /* 1262 * Free everything that we point to (that's born after 1263 * the previous snapshot, if we are a clone) 1264 * 1265 * XXX we're doing this long task with the config lock held 1266 */ 1267 ka.usedp = &used; 1268 ka.compressedp = &compressed; 1269 ka.uncompressedp = &uncompressed; 1270 ka.zio = zio; 1271 ka.tx = tx; 1272 err = traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 1273 ADVANCE_POST, kill_blkptr, &ka); 1274 ASSERT3U(err, ==, 0); 1275 } 1276 1277 err = zio_wait(zio); 1278 ASSERT3U(err, ==, 0); 1279 1280 dsl_dir_diduse_space(ds->ds_dir, -used, -compressed, -uncompressed, tx); 1281 1282 if (ds->ds_phys->ds_snapnames_zapobj) { 1283 err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); 1284 ASSERT(err == 0); 1285 } 1286 1287 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { 1288 /* Erase the link in the dataset */ 1289 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); 1290 ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; 1291 /* 1292 * dsl_dir_sync_destroy() called us, they'll destroy 1293 * the dataset. 1294 */ 1295 } else { 1296 /* remove from snapshot namespace */ 1297 dsl_dataset_t *ds_head; 1298 VERIFY(0 == dsl_dataset_open_obj(dp, 1299 ds->ds_dir->dd_phys->dd_head_dataset_obj, NULL, 1300 DS_MODE_NONE, FTAG, &ds_head)); 1301 VERIFY(0 == dsl_dataset_get_snapname(ds)); 1302 #ifdef ZFS_DEBUG 1303 { 1304 uint64_t val; 1305 err = zap_lookup(mos, 1306 ds_head->ds_phys->ds_snapnames_zapobj, 1307 ds->ds_snapname, 8, 1, &val); 1308 ASSERT3U(err, ==, 0); 1309 ASSERT3U(val, ==, obj); 1310 } 1311 #endif 1312 err = zap_remove(mos, ds_head->ds_phys->ds_snapnames_zapobj, 1313 ds->ds_snapname, tx); 1314 ASSERT(err == 0); 1315 dsl_dataset_close(ds_head, DS_MODE_NONE, FTAG); 1316 } 1317 1318 if (ds_prev && ds->ds_prev != ds_prev) 1319 dsl_dataset_close(ds_prev, DS_MODE_NONE, FTAG); 1320 1321 spa_clear_bootfs(dp->dp_spa, ds->ds_object, tx); 1322 spa_history_internal_log(LOG_DS_DESTROY, dp->dp_spa, tx, 1323 cr, "dataset = %llu", ds->ds_object); 1324 1325 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, tag); 1326 VERIFY(0 == dmu_object_free(mos, obj, tx)); 1327 1328 } 1329 1330 /* ARGSUSED */ 1331 int 1332 dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) 1333 { 1334 objset_t *os = arg1; 1335 dsl_dataset_t *ds = os->os->os_dsl_dataset; 1336 const char *snapname = arg2; 1337 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1338 int err; 1339 uint64_t value; 1340 1341 /* 1342 * We don't allow multiple snapshots of the same txg. If there 1343 * is already one, try again. 1344 */ 1345 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) 1346 return (EAGAIN); 1347 1348 /* 1349 * Check for conflicting name snapshot name. 1350 */ 1351 err = zap_lookup(mos, ds->ds_phys->ds_snapnames_zapobj, 1352 snapname, 8, 1, &value); 1353 if (err == 0) 1354 return (EEXIST); 1355 if (err != ENOENT) 1356 return (err); 1357 1358 /* 1359 * Check that the dataset's name is not too long. Name consists 1360 * of the dataset's length + 1 for the @-sign + snapshot name's length 1361 */ 1362 if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN) 1363 return (ENAMETOOLONG); 1364 1365 ds->ds_trysnap_txg = tx->tx_txg; 1366 return (0); 1367 } 1368 1369 void 1370 dsl_dataset_snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1371 { 1372 objset_t *os = arg1; 1373 dsl_dataset_t *ds = os->os->os_dsl_dataset; 1374 const char *snapname = arg2; 1375 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1376 dmu_buf_t *dbuf; 1377 dsl_dataset_phys_t *dsphys; 1378 uint64_t dsobj; 1379 objset_t *mos = dp->dp_meta_objset; 1380 int err; 1381 1382 spa_scrub_restart(dp->dp_spa, tx->tx_txg); 1383 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 1384 1385 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1386 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1387 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1388 dmu_buf_will_dirty(dbuf, tx); 1389 dsphys = dbuf->db_data; 1390 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1391 dsphys->ds_fsid_guid = unique_create(); 1392 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1393 sizeof (dsphys->ds_guid)); 1394 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; 1395 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; 1396 dsphys->ds_next_snap_obj = ds->ds_object; 1397 dsphys->ds_num_children = 1; 1398 dsphys->ds_creation_time = gethrestime_sec(); 1399 dsphys->ds_creation_txg = tx->tx_txg; 1400 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; 1401 dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; 1402 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; 1403 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; 1404 dsphys->ds_flags = ds->ds_phys->ds_flags; 1405 dsphys->ds_bp = ds->ds_phys->ds_bp; 1406 dmu_buf_rele(dbuf, FTAG); 1407 1408 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); 1409 if (ds->ds_prev) { 1410 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == 1411 ds->ds_object || 1412 ds->ds_prev->ds_phys->ds_num_children > 1); 1413 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1414 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1415 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1416 ds->ds_prev->ds_phys->ds_creation_txg); 1417 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; 1418 } 1419 } 1420 1421 bplist_close(&ds->ds_deadlist); 1422 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1423 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, dsphys->ds_creation_txg); 1424 ds->ds_phys->ds_prev_snap_obj = dsobj; 1425 ds->ds_phys->ds_prev_snap_txg = dsphys->ds_creation_txg; 1426 ds->ds_phys->ds_unique_bytes = 0; 1427 ds->ds_phys->ds_deadlist_obj = 1428 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 1429 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 1430 ds->ds_phys->ds_deadlist_obj)); 1431 1432 dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); 1433 err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, 1434 snapname, 8, 1, &dsobj, tx); 1435 ASSERT(err == 0); 1436 1437 if (ds->ds_prev) 1438 dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds); 1439 VERIFY(0 == dsl_dataset_open_obj(dp, 1440 ds->ds_phys->ds_prev_snap_obj, snapname, 1441 DS_MODE_NONE, ds, &ds->ds_prev)); 1442 1443 spa_history_internal_log(LOG_DS_SNAPSHOT, dp->dp_spa, tx, cr, 1444 "dataset = %llu", dsobj); 1445 } 1446 1447 void 1448 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1449 { 1450 ASSERT(dmu_tx_is_syncing(tx)); 1451 ASSERT(ds->ds_user_ptr != NULL); 1452 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); 1453 1454 /* 1455 * in case we had to change ds_fsid_guid when we opened it, 1456 * sync it out now. 1457 */ 1458 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1459 ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; 1460 1461 dsl_dir_dirty(ds->ds_dir, tx); 1462 dmu_objset_sync(ds->ds_user_ptr, zio, tx); 1463 } 1464 1465 void 1466 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1467 { 1468 dsl_dir_stats(ds->ds_dir, nv); 1469 1470 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1471 ds->ds_phys->ds_creation_time); 1472 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1473 ds->ds_phys->ds_creation_txg); 1474 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 1475 ds->ds_phys->ds_used_bytes); 1476 1477 if (ds->ds_phys->ds_next_snap_obj) { 1478 /* 1479 * This is a snapshot; override the dd's space used with 1480 * our unique space and compression ratio. 1481 */ 1482 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1483 ds->ds_phys->ds_unique_bytes); 1484 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 1485 ds->ds_phys->ds_compressed_bytes == 0 ? 100 : 1486 (ds->ds_phys->ds_uncompressed_bytes * 100 / 1487 ds->ds_phys->ds_compressed_bytes)); 1488 } 1489 } 1490 1491 void 1492 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1493 { 1494 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; 1495 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; 1496 if (ds->ds_phys->ds_next_snap_obj) { 1497 stat->dds_is_snapshot = B_TRUE; 1498 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; 1499 } 1500 1501 /* clone origin is really a dsl_dir thing... */ 1502 if (ds->ds_dir->dd_phys->dd_clone_parent_obj) { 1503 dsl_dataset_t *ods; 1504 1505 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER); 1506 VERIFY(0 == dsl_dataset_open_obj(ds->ds_dir->dd_pool, 1507 ds->ds_dir->dd_phys->dd_clone_parent_obj, 1508 NULL, DS_MODE_NONE, FTAG, &ods)); 1509 dsl_dataset_name(ods, stat->dds_clone_of); 1510 dsl_dataset_close(ods, DS_MODE_NONE, FTAG); 1511 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock); 1512 } 1513 } 1514 1515 uint64_t 1516 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1517 { 1518 return (ds->ds_fsid_guid); 1519 } 1520 1521 void 1522 dsl_dataset_space(dsl_dataset_t *ds, 1523 uint64_t *refdbytesp, uint64_t *availbytesp, 1524 uint64_t *usedobjsp, uint64_t *availobjsp) 1525 { 1526 *refdbytesp = ds->ds_phys->ds_used_bytes; 1527 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1528 *usedobjsp = ds->ds_phys->ds_bp.blk_fill; 1529 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1530 } 1531 1532 /* ARGSUSED */ 1533 static int 1534 dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) 1535 { 1536 dsl_dataset_t *ds = arg1; 1537 char *newsnapname = arg2; 1538 dsl_dir_t *dd = ds->ds_dir; 1539 objset_t *mos = dd->dd_pool->dp_meta_objset; 1540 dsl_dataset_t *hds; 1541 uint64_t val; 1542 int err; 1543 1544 err = dsl_dataset_open_obj(dd->dd_pool, 1545 dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds); 1546 if (err) 1547 return (err); 1548 1549 /* new name better not be in use */ 1550 err = zap_lookup(mos, hds->ds_phys->ds_snapnames_zapobj, 1551 newsnapname, 8, 1, &val); 1552 dsl_dataset_close(hds, DS_MODE_NONE, FTAG); 1553 1554 if (err == 0) 1555 err = EEXIST; 1556 else if (err == ENOENT) 1557 err = 0; 1558 1559 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 1560 if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN) 1561 err = ENAMETOOLONG; 1562 1563 return (err); 1564 } 1565 1566 static void 1567 dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, 1568 cred_t *cr, dmu_tx_t *tx) 1569 { 1570 dsl_dataset_t *ds = arg1; 1571 const char *newsnapname = arg2; 1572 dsl_dir_t *dd = ds->ds_dir; 1573 objset_t *mos = dd->dd_pool->dp_meta_objset; 1574 dsl_dataset_t *hds; 1575 int err; 1576 1577 ASSERT(ds->ds_phys->ds_next_snap_obj != 0); 1578 1579 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, 1580 dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds)); 1581 1582 VERIFY(0 == dsl_dataset_get_snapname(ds)); 1583 err = zap_remove(mos, hds->ds_phys->ds_snapnames_zapobj, 1584 ds->ds_snapname, tx); 1585 ASSERT3U(err, ==, 0); 1586 mutex_enter(&ds->ds_lock); 1587 (void) strcpy(ds->ds_snapname, newsnapname); 1588 mutex_exit(&ds->ds_lock); 1589 err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, 1590 ds->ds_snapname, 8, 1, &ds->ds_object, tx); 1591 ASSERT3U(err, ==, 0); 1592 1593 spa_history_internal_log(LOG_DS_RENAME, dd->dd_pool->dp_spa, tx, 1594 cr, "dataset = %llu", ds->ds_object); 1595 dsl_dataset_close(hds, DS_MODE_NONE, FTAG); 1596 } 1597 1598 struct renamearg { 1599 dsl_sync_task_group_t *dstg; 1600 char failed[MAXPATHLEN]; 1601 char *oldsnap; 1602 char *newsnap; 1603 }; 1604 1605 static int 1606 dsl_snapshot_rename_one(char *name, void *arg) 1607 { 1608 struct renamearg *ra = arg; 1609 dsl_dataset_t *ds = NULL; 1610 char *cp; 1611 int err; 1612 1613 cp = name + strlen(name); 1614 *cp = '@'; 1615 (void) strcpy(cp + 1, ra->oldsnap); 1616 1617 /* 1618 * For recursive snapshot renames the parent won't be changing 1619 * so we just pass name for both the to/from argument. 1620 */ 1621 if (err = zfs_secpolicy_rename_perms(name, name, CRED())) { 1622 (void) strcpy(ra->failed, name); 1623 return (err); 1624 } 1625 1626 err = dsl_dataset_open(name, DS_MODE_READONLY | DS_MODE_STANDARD, 1627 ra->dstg, &ds); 1628 if (err == ENOENT) { 1629 *cp = '\0'; 1630 return (0); 1631 } 1632 if (err) { 1633 (void) strcpy(ra->failed, name); 1634 *cp = '\0'; 1635 dsl_dataset_close(ds, DS_MODE_STANDARD, ra->dstg); 1636 return (err); 1637 } 1638 1639 #ifdef _KERNEL 1640 /* for all filesystems undergoing rename, we'll need to unmount it */ 1641 (void) zfs_unmount_snap(name, NULL); 1642 #endif 1643 1644 *cp = '\0'; 1645 1646 dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check, 1647 dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0); 1648 1649 return (0); 1650 } 1651 1652 static int 1653 dsl_recursive_rename(char *oldname, const char *newname) 1654 { 1655 int err; 1656 struct renamearg *ra; 1657 dsl_sync_task_t *dst; 1658 spa_t *spa; 1659 char *cp, *fsname = spa_strdup(oldname); 1660 int len = strlen(oldname); 1661 1662 /* truncate the snapshot name to get the fsname */ 1663 cp = strchr(fsname, '@'); 1664 *cp = '\0'; 1665 1666 err = spa_open(fsname, &spa, FTAG); 1667 if (err) { 1668 kmem_free(fsname, len + 1); 1669 return (err); 1670 } 1671 ra = kmem_alloc(sizeof (struct renamearg), KM_SLEEP); 1672 ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 1673 1674 ra->oldsnap = strchr(oldname, '@') + 1; 1675 ra->newsnap = strchr(newname, '@') + 1; 1676 *ra->failed = '\0'; 1677 1678 err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra, 1679 DS_FIND_CHILDREN); 1680 kmem_free(fsname, len + 1); 1681 1682 if (err == 0) { 1683 err = dsl_sync_task_group_wait(ra->dstg); 1684 } 1685 1686 for (dst = list_head(&ra->dstg->dstg_tasks); dst; 1687 dst = list_next(&ra->dstg->dstg_tasks, dst)) { 1688 dsl_dataset_t *ds = dst->dst_arg1; 1689 if (dst->dst_err) { 1690 dsl_dir_name(ds->ds_dir, ra->failed); 1691 (void) strcat(ra->failed, "@"); 1692 (void) strcat(ra->failed, ra->newsnap); 1693 } 1694 dsl_dataset_close(ds, DS_MODE_STANDARD, ra->dstg); 1695 } 1696 1697 if (err) 1698 (void) strcpy(oldname, ra->failed); 1699 1700 dsl_sync_task_group_destroy(ra->dstg); 1701 kmem_free(ra, sizeof (struct renamearg)); 1702 spa_close(spa, FTAG); 1703 return (err); 1704 } 1705 1706 static int 1707 dsl_valid_rename(char *oldname, void *arg) 1708 { 1709 int delta = *(int *)arg; 1710 1711 if (strlen(oldname) + delta >= MAXNAMELEN) 1712 return (ENAMETOOLONG); 1713 1714 return (0); 1715 } 1716 1717 #pragma weak dmu_objset_rename = dsl_dataset_rename 1718 int 1719 dsl_dataset_rename(char *oldname, const char *newname, 1720 boolean_t recursive) 1721 { 1722 dsl_dir_t *dd; 1723 dsl_dataset_t *ds; 1724 const char *tail; 1725 int err; 1726 1727 err = dsl_dir_open(oldname, FTAG, &dd, &tail); 1728 if (err) 1729 return (err); 1730 if (tail == NULL) { 1731 int delta = strlen(newname) - strlen(oldname); 1732 1733 /* if we're growing, validate child size lengths */ 1734 if (delta > 0) 1735 err = dmu_objset_find(oldname, dsl_valid_rename, 1736 &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); 1737 1738 if (!err) 1739 err = dsl_dir_rename(dd, newname); 1740 dsl_dir_close(dd, FTAG); 1741 return (err); 1742 } 1743 if (tail[0] != '@') { 1744 /* the name ended in a nonexistant component */ 1745 dsl_dir_close(dd, FTAG); 1746 return (ENOENT); 1747 } 1748 1749 dsl_dir_close(dd, FTAG); 1750 1751 /* new name must be snapshot in same filesystem */ 1752 tail = strchr(newname, '@'); 1753 if (tail == NULL) 1754 return (EINVAL); 1755 tail++; 1756 if (strncmp(oldname, newname, tail - newname) != 0) 1757 return (EXDEV); 1758 1759 if (recursive) { 1760 err = dsl_recursive_rename(oldname, newname); 1761 } else { 1762 err = dsl_dataset_open(oldname, 1763 DS_MODE_READONLY | DS_MODE_STANDARD, FTAG, &ds); 1764 if (err) 1765 return (err); 1766 1767 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 1768 dsl_dataset_snapshot_rename_check, 1769 dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); 1770 1771 dsl_dataset_close(ds, DS_MODE_STANDARD, FTAG); 1772 } 1773 1774 return (err); 1775 } 1776 1777 struct promotearg { 1778 uint64_t used, comp, uncomp, unique; 1779 uint64_t newnext_obj, snapnames_obj; 1780 }; 1781 1782 /* ARGSUSED */ 1783 static int 1784 dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) 1785 { 1786 dsl_dataset_t *hds = arg1; 1787 struct promotearg *pa = arg2; 1788 dsl_dir_t *dd = hds->ds_dir; 1789 dsl_pool_t *dp = hds->ds_dir->dd_pool; 1790 dsl_dir_t *pdd = NULL; 1791 dsl_dataset_t *ds = NULL; 1792 dsl_dataset_t *pivot_ds = NULL; 1793 dsl_dataset_t *newnext_ds = NULL; 1794 int err; 1795 char *name = NULL; 1796 uint64_t itor = 0; 1797 blkptr_t bp; 1798 1799 bzero(pa, sizeof (*pa)); 1800 1801 /* Check that it is a clone */ 1802 if (dd->dd_phys->dd_clone_parent_obj == 0) 1803 return (EINVAL); 1804 1805 /* Since this is so expensive, don't do the preliminary check */ 1806 if (!dmu_tx_is_syncing(tx)) 1807 return (0); 1808 1809 if (err = dsl_dataset_open_obj(dp, 1810 dd->dd_phys->dd_clone_parent_obj, 1811 NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds)) 1812 goto out; 1813 pdd = pivot_ds->ds_dir; 1814 1815 { 1816 dsl_dataset_t *phds; 1817 if (err = dsl_dataset_open_obj(dd->dd_pool, 1818 pdd->dd_phys->dd_head_dataset_obj, 1819 NULL, DS_MODE_NONE, FTAG, &phds)) 1820 goto out; 1821 pa->snapnames_obj = phds->ds_phys->ds_snapnames_zapobj; 1822 dsl_dataset_close(phds, DS_MODE_NONE, FTAG); 1823 } 1824 1825 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) { 1826 err = EXDEV; 1827 goto out; 1828 } 1829 1830 /* find pivot point's new next ds */ 1831 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, hds->ds_object, 1832 NULL, DS_MODE_NONE, FTAG, &newnext_ds)); 1833 while (newnext_ds->ds_phys->ds_prev_snap_obj != pivot_ds->ds_object) { 1834 dsl_dataset_t *prev; 1835 1836 if (err = dsl_dataset_open_obj(dd->dd_pool, 1837 newnext_ds->ds_phys->ds_prev_snap_obj, 1838 NULL, DS_MODE_NONE, FTAG, &prev)) 1839 goto out; 1840 dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); 1841 newnext_ds = prev; 1842 } 1843 pa->newnext_obj = newnext_ds->ds_object; 1844 1845 /* compute pivot point's new unique space */ 1846 while ((err = bplist_iterate(&newnext_ds->ds_deadlist, 1847 &itor, &bp)) == 0) { 1848 if (bp.blk_birth > pivot_ds->ds_phys->ds_prev_snap_txg) 1849 pa->unique += bp_get_dasize(dd->dd_pool->dp_spa, &bp); 1850 } 1851 if (err != ENOENT) 1852 goto out; 1853 1854 /* Walk the snapshots that we are moving */ 1855 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1856 ds = pivot_ds; 1857 /* CONSTCOND */ 1858 while (TRUE) { 1859 uint64_t val, dlused, dlcomp, dluncomp; 1860 dsl_dataset_t *prev; 1861 1862 /* Check that the snapshot name does not conflict */ 1863 dsl_dataset_name(ds, name); 1864 err = zap_lookup(dd->dd_pool->dp_meta_objset, 1865 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 1866 8, 1, &val); 1867 if (err != ENOENT) { 1868 if (err == 0) 1869 err = EEXIST; 1870 goto out; 1871 } 1872 1873 /* 1874 * compute space to transfer. Each snapshot gave birth to: 1875 * (my used) - (prev's used) + (deadlist's used) 1876 */ 1877 pa->used += ds->ds_phys->ds_used_bytes; 1878 pa->comp += ds->ds_phys->ds_compressed_bytes; 1879 pa->uncomp += ds->ds_phys->ds_uncompressed_bytes; 1880 1881 /* If we reach the first snapshot, we're done. */ 1882 if (ds->ds_phys->ds_prev_snap_obj == 0) 1883 break; 1884 1885 if (err = bplist_space(&ds->ds_deadlist, 1886 &dlused, &dlcomp, &dluncomp)) 1887 goto out; 1888 if (err = dsl_dataset_open_obj(dd->dd_pool, 1889 ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, 1890 FTAG, &prev)) 1891 goto out; 1892 pa->used += dlused - prev->ds_phys->ds_used_bytes; 1893 pa->comp += dlcomp - prev->ds_phys->ds_compressed_bytes; 1894 pa->uncomp += dluncomp - prev->ds_phys->ds_uncompressed_bytes; 1895 1896 /* 1897 * We could be a clone of a clone. If we reach our 1898 * parent's branch point, we're done. 1899 */ 1900 if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { 1901 dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); 1902 break; 1903 } 1904 if (ds != pivot_ds) 1905 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 1906 ds = prev; 1907 } 1908 1909 /* Check that there is enough space here */ 1910 err = dsl_dir_transfer_possible(pdd, dd, pa->used); 1911 1912 out: 1913 if (ds && ds != pivot_ds) 1914 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 1915 if (pivot_ds) 1916 dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG); 1917 if (newnext_ds) 1918 dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG); 1919 if (name) 1920 kmem_free(name, MAXPATHLEN); 1921 return (err); 1922 } 1923 1924 static void 1925 dsl_dataset_promote_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1926 { 1927 dsl_dataset_t *hds = arg1; 1928 struct promotearg *pa = arg2; 1929 dsl_dir_t *dd = hds->ds_dir; 1930 dsl_pool_t *dp = hds->ds_dir->dd_pool; 1931 dsl_dir_t *pdd = NULL; 1932 dsl_dataset_t *ds, *pivot_ds; 1933 char *name; 1934 1935 ASSERT(dd->dd_phys->dd_clone_parent_obj != 0); 1936 ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); 1937 1938 VERIFY(0 == dsl_dataset_open_obj(dp, 1939 dd->dd_phys->dd_clone_parent_obj, 1940 NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds)); 1941 /* 1942 * We need to explicitly open pdd, since pivot_ds's pdd will be 1943 * changing. 1944 */ 1945 VERIFY(0 == dsl_dir_open_obj(dp, pivot_ds->ds_dir->dd_object, 1946 NULL, FTAG, &pdd)); 1947 1948 /* move snapshots to this dir */ 1949 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1950 ds = pivot_ds; 1951 /* CONSTCOND */ 1952 while (TRUE) { 1953 dsl_dataset_t *prev; 1954 1955 /* move snap name entry */ 1956 dsl_dataset_name(ds, name); 1957 VERIFY(0 == zap_remove(dp->dp_meta_objset, 1958 pa->snapnames_obj, ds->ds_snapname, tx)); 1959 VERIFY(0 == zap_add(dp->dp_meta_objset, 1960 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 1961 8, 1, &ds->ds_object, tx)); 1962 1963 /* change containing dsl_dir */ 1964 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1965 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, pdd->dd_object); 1966 ds->ds_phys->ds_dir_obj = dd->dd_object; 1967 ASSERT3P(ds->ds_dir, ==, pdd); 1968 dsl_dir_close(ds->ds_dir, ds); 1969 VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, 1970 NULL, ds, &ds->ds_dir)); 1971 1972 ASSERT3U(dsl_prop_numcb(ds), ==, 0); 1973 1974 if (ds->ds_phys->ds_prev_snap_obj == 0) 1975 break; 1976 1977 VERIFY(0 == dsl_dataset_open_obj(dp, 1978 ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE, 1979 FTAG, &prev)); 1980 1981 if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) { 1982 dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG); 1983 break; 1984 } 1985 if (ds != pivot_ds) 1986 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 1987 ds = prev; 1988 } 1989 if (ds != pivot_ds) 1990 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 1991 1992 /* change pivot point's next snap */ 1993 dmu_buf_will_dirty(pivot_ds->ds_dbuf, tx); 1994 pivot_ds->ds_phys->ds_next_snap_obj = pa->newnext_obj; 1995 1996 /* change clone_parent-age */ 1997 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1998 ASSERT3U(dd->dd_phys->dd_clone_parent_obj, ==, pivot_ds->ds_object); 1999 dd->dd_phys->dd_clone_parent_obj = pdd->dd_phys->dd_clone_parent_obj; 2000 dmu_buf_will_dirty(pdd->dd_dbuf, tx); 2001 pdd->dd_phys->dd_clone_parent_obj = pivot_ds->ds_object; 2002 2003 /* change space accounting */ 2004 dsl_dir_diduse_space(pdd, -pa->used, -pa->comp, -pa->uncomp, tx); 2005 dsl_dir_diduse_space(dd, pa->used, pa->comp, pa->uncomp, tx); 2006 pivot_ds->ds_phys->ds_unique_bytes = pa->unique; 2007 2008 /* log history record */ 2009 spa_history_internal_log(LOG_DS_PROMOTE, dd->dd_pool->dp_spa, tx, 2010 cr, "dataset = %llu", ds->ds_object); 2011 2012 dsl_dir_close(pdd, FTAG); 2013 dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG); 2014 kmem_free(name, MAXPATHLEN); 2015 } 2016 2017 int 2018 dsl_dataset_promote(const char *name) 2019 { 2020 dsl_dataset_t *ds; 2021 int err; 2022 dmu_object_info_t doi; 2023 struct promotearg pa; 2024 2025 err = dsl_dataset_open(name, DS_MODE_NONE, FTAG, &ds); 2026 if (err) 2027 return (err); 2028 2029 err = dmu_object_info(ds->ds_dir->dd_pool->dp_meta_objset, 2030 ds->ds_phys->ds_snapnames_zapobj, &doi); 2031 if (err) { 2032 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); 2033 return (err); 2034 } 2035 2036 /* 2037 * Add in 128x the snapnames zapobj size, since we will be moving 2038 * a bunch of snapnames to the promoted ds, and dirtying their 2039 * bonus buffers. 2040 */ 2041 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 2042 dsl_dataset_promote_check, 2043 dsl_dataset_promote_sync, ds, &pa, 2 + 2 * doi.doi_physical_blks); 2044 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); 2045 return (err); 2046 } 2047 2048 /* 2049 * Given a pool name and a dataset object number in that pool, 2050 * return the name of that dataset. 2051 */ 2052 int 2053 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 2054 { 2055 spa_t *spa; 2056 dsl_pool_t *dp; 2057 dsl_dataset_t *ds = NULL; 2058 int error; 2059 2060 if ((error = spa_open(pname, &spa, FTAG)) != 0) 2061 return (error); 2062 dp = spa_get_dsl(spa); 2063 rw_enter(&dp->dp_config_rwlock, RW_READER); 2064 if ((error = dsl_dataset_open_obj(dp, obj, 2065 NULL, DS_MODE_NONE, FTAG, &ds)) != 0) { 2066 rw_exit(&dp->dp_config_rwlock); 2067 spa_close(spa, FTAG); 2068 return (error); 2069 } 2070 dsl_dataset_name(ds, buf); 2071 dsl_dataset_close(ds, DS_MODE_NONE, FTAG); 2072 rw_exit(&dp->dp_config_rwlock); 2073 spa_close(spa, FTAG); 2074 2075 return (0); 2076 } 2077