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) 2013 by Delphix. All rights reserved. 24 */ 25 26 #include <sys/bpobj.h> 27 #include <sys/zfs_context.h> 28 #include <sys/refcount.h> 29 #include <sys/dsl_pool.h> 30 #include <sys/zfeature.h> 31 #include <sys/zap.h> 32 33 /* 34 * Return an empty bpobj, preferably the empty dummy one (dp_empty_bpobj). 35 */ 36 uint64_t 37 bpobj_alloc_empty(objset_t *os, int blocksize, dmu_tx_t *tx) 38 { 39 spa_t *spa = dmu_objset_spa(os); 40 dsl_pool_t *dp = dmu_objset_pool(os); 41 42 if (spa_feature_is_enabled(spa, SPA_FEATURE_EMPTY_BPOBJ)) { 43 if (!spa_feature_is_active(spa, SPA_FEATURE_EMPTY_BPOBJ)) { 44 ASSERT0(dp->dp_empty_bpobj); 45 dp->dp_empty_bpobj = 46 bpobj_alloc(os, SPA_MAXBLOCKSIZE, tx); 47 VERIFY(zap_add(os, 48 DMU_POOL_DIRECTORY_OBJECT, 49 DMU_POOL_EMPTY_BPOBJ, sizeof (uint64_t), 1, 50 &dp->dp_empty_bpobj, tx) == 0); 51 } 52 spa_feature_incr(spa, SPA_FEATURE_EMPTY_BPOBJ, tx); 53 ASSERT(dp->dp_empty_bpobj != 0); 54 return (dp->dp_empty_bpobj); 55 } else { 56 return (bpobj_alloc(os, blocksize, tx)); 57 } 58 } 59 60 void 61 bpobj_decr_empty(objset_t *os, dmu_tx_t *tx) 62 { 63 dsl_pool_t *dp = dmu_objset_pool(os); 64 65 spa_feature_decr(dmu_objset_spa(os), SPA_FEATURE_EMPTY_BPOBJ, tx); 66 if (!spa_feature_is_active(dmu_objset_spa(os), 67 SPA_FEATURE_EMPTY_BPOBJ)) { 68 VERIFY3U(0, ==, zap_remove(dp->dp_meta_objset, 69 DMU_POOL_DIRECTORY_OBJECT, 70 DMU_POOL_EMPTY_BPOBJ, tx)); 71 VERIFY3U(0, ==, dmu_object_free(os, dp->dp_empty_bpobj, tx)); 72 dp->dp_empty_bpobj = 0; 73 } 74 } 75 76 uint64_t 77 bpobj_alloc(objset_t *os, int blocksize, dmu_tx_t *tx) 78 { 79 int size; 80 81 if (spa_version(dmu_objset_spa(os)) < SPA_VERSION_BPOBJ_ACCOUNT) 82 size = BPOBJ_SIZE_V0; 83 else if (spa_version(dmu_objset_spa(os)) < SPA_VERSION_DEADLISTS) 84 size = BPOBJ_SIZE_V1; 85 else 86 size = sizeof (bpobj_phys_t); 87 88 return (dmu_object_alloc(os, DMU_OT_BPOBJ, blocksize, 89 DMU_OT_BPOBJ_HDR, size, tx)); 90 } 91 92 void 93 bpobj_free(objset_t *os, uint64_t obj, dmu_tx_t *tx) 94 { 95 int64_t i; 96 bpobj_t bpo; 97 dmu_object_info_t doi; 98 int epb; 99 dmu_buf_t *dbuf = NULL; 100 101 ASSERT(obj != dmu_objset_pool(os)->dp_empty_bpobj); 102 VERIFY3U(0, ==, bpobj_open(&bpo, os, obj)); 103 104 mutex_enter(&bpo.bpo_lock); 105 106 if (!bpo.bpo_havesubobj || bpo.bpo_phys->bpo_subobjs == 0) 107 goto out; 108 109 VERIFY3U(0, ==, dmu_object_info(os, bpo.bpo_phys->bpo_subobjs, &doi)); 110 epb = doi.doi_data_block_size / sizeof (uint64_t); 111 112 for (i = bpo.bpo_phys->bpo_num_subobjs - 1; i >= 0; i--) { 113 uint64_t *objarray; 114 uint64_t offset, blkoff; 115 116 offset = i * sizeof (uint64_t); 117 blkoff = P2PHASE(i, epb); 118 119 if (dbuf == NULL || dbuf->db_offset > offset) { 120 if (dbuf) 121 dmu_buf_rele(dbuf, FTAG); 122 VERIFY3U(0, ==, dmu_buf_hold(os, 123 bpo.bpo_phys->bpo_subobjs, offset, FTAG, &dbuf, 0)); 124 } 125 126 ASSERT3U(offset, >=, dbuf->db_offset); 127 ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size); 128 129 objarray = dbuf->db_data; 130 bpobj_free(os, objarray[blkoff], tx); 131 } 132 if (dbuf) { 133 dmu_buf_rele(dbuf, FTAG); 134 dbuf = NULL; 135 } 136 VERIFY3U(0, ==, dmu_object_free(os, bpo.bpo_phys->bpo_subobjs, tx)); 137 138 out: 139 mutex_exit(&bpo.bpo_lock); 140 bpobj_close(&bpo); 141 142 VERIFY3U(0, ==, dmu_object_free(os, obj, tx)); 143 } 144 145 int 146 bpobj_open(bpobj_t *bpo, objset_t *os, uint64_t object) 147 { 148 dmu_object_info_t doi; 149 int err; 150 151 err = dmu_object_info(os, object, &doi); 152 if (err) 153 return (err); 154 155 bzero(bpo, sizeof (*bpo)); 156 mutex_init(&bpo->bpo_lock, NULL, MUTEX_DEFAULT, NULL); 157 158 ASSERT(bpo->bpo_dbuf == NULL); 159 ASSERT(bpo->bpo_phys == NULL); 160 ASSERT(object != 0); 161 ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ); 162 ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_BPOBJ_HDR); 163 164 err = dmu_bonus_hold(os, object, bpo, &bpo->bpo_dbuf); 165 if (err) 166 return (err); 167 168 bpo->bpo_os = os; 169 bpo->bpo_object = object; 170 bpo->bpo_epb = doi.doi_data_block_size >> SPA_BLKPTRSHIFT; 171 bpo->bpo_havecomp = (doi.doi_bonus_size > BPOBJ_SIZE_V0); 172 bpo->bpo_havesubobj = (doi.doi_bonus_size > BPOBJ_SIZE_V1); 173 bpo->bpo_phys = bpo->bpo_dbuf->db_data; 174 return (0); 175 } 176 177 void 178 bpobj_close(bpobj_t *bpo) 179 { 180 /* Lame workaround for closing a bpobj that was never opened. */ 181 if (bpo->bpo_object == 0) 182 return; 183 184 dmu_buf_rele(bpo->bpo_dbuf, bpo); 185 if (bpo->bpo_cached_dbuf != NULL) 186 dmu_buf_rele(bpo->bpo_cached_dbuf, bpo); 187 bpo->bpo_dbuf = NULL; 188 bpo->bpo_phys = NULL; 189 bpo->bpo_cached_dbuf = NULL; 190 bpo->bpo_object = 0; 191 192 mutex_destroy(&bpo->bpo_lock); 193 } 194 195 static int 196 bpobj_iterate_impl(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx, 197 boolean_t free) 198 { 199 dmu_object_info_t doi; 200 int epb; 201 int64_t i; 202 int err = 0; 203 dmu_buf_t *dbuf = NULL; 204 205 mutex_enter(&bpo->bpo_lock); 206 207 if (free) 208 dmu_buf_will_dirty(bpo->bpo_dbuf, tx); 209 210 for (i = bpo->bpo_phys->bpo_num_blkptrs - 1; i >= 0; i--) { 211 blkptr_t *bparray; 212 blkptr_t *bp; 213 uint64_t offset, blkoff; 214 215 offset = i * sizeof (blkptr_t); 216 blkoff = P2PHASE(i, bpo->bpo_epb); 217 218 if (dbuf == NULL || dbuf->db_offset > offset) { 219 if (dbuf) 220 dmu_buf_rele(dbuf, FTAG); 221 err = dmu_buf_hold(bpo->bpo_os, bpo->bpo_object, offset, 222 FTAG, &dbuf, 0); 223 if (err) 224 break; 225 } 226 227 ASSERT3U(offset, >=, dbuf->db_offset); 228 ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size); 229 230 bparray = dbuf->db_data; 231 bp = &bparray[blkoff]; 232 err = func(arg, bp, tx); 233 if (err) 234 break; 235 if (free) { 236 bpo->bpo_phys->bpo_bytes -= 237 bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp); 238 ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0); 239 if (bpo->bpo_havecomp) { 240 bpo->bpo_phys->bpo_comp -= BP_GET_PSIZE(bp); 241 bpo->bpo_phys->bpo_uncomp -= BP_GET_UCSIZE(bp); 242 } 243 bpo->bpo_phys->bpo_num_blkptrs--; 244 ASSERT3S(bpo->bpo_phys->bpo_num_blkptrs, >=, 0); 245 } 246 } 247 if (dbuf) { 248 dmu_buf_rele(dbuf, FTAG); 249 dbuf = NULL; 250 } 251 if (free) { 252 i++; 253 VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os, bpo->bpo_object, 254 i * sizeof (blkptr_t), -1ULL, tx)); 255 } 256 if (err || !bpo->bpo_havesubobj || bpo->bpo_phys->bpo_subobjs == 0) 257 goto out; 258 259 ASSERT(bpo->bpo_havecomp); 260 err = dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi); 261 if (err) { 262 mutex_exit(&bpo->bpo_lock); 263 return (err); 264 } 265 ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ); 266 epb = doi.doi_data_block_size / sizeof (uint64_t); 267 268 for (i = bpo->bpo_phys->bpo_num_subobjs - 1; i >= 0; i--) { 269 uint64_t *objarray; 270 uint64_t offset, blkoff; 271 bpobj_t sublist; 272 uint64_t used_before, comp_before, uncomp_before; 273 uint64_t used_after, comp_after, uncomp_after; 274 275 offset = i * sizeof (uint64_t); 276 blkoff = P2PHASE(i, epb); 277 278 if (dbuf == NULL || dbuf->db_offset > offset) { 279 if (dbuf) 280 dmu_buf_rele(dbuf, FTAG); 281 err = dmu_buf_hold(bpo->bpo_os, 282 bpo->bpo_phys->bpo_subobjs, offset, FTAG, &dbuf, 0); 283 if (err) 284 break; 285 } 286 287 ASSERT3U(offset, >=, dbuf->db_offset); 288 ASSERT3U(offset, <, dbuf->db_offset + dbuf->db_size); 289 290 objarray = dbuf->db_data; 291 err = bpobj_open(&sublist, bpo->bpo_os, objarray[blkoff]); 292 if (err) 293 break; 294 if (free) { 295 err = bpobj_space(&sublist, 296 &used_before, &comp_before, &uncomp_before); 297 if (err) 298 break; 299 } 300 err = bpobj_iterate_impl(&sublist, func, arg, tx, free); 301 if (free) { 302 VERIFY3U(0, ==, bpobj_space(&sublist, 303 &used_after, &comp_after, &uncomp_after)); 304 bpo->bpo_phys->bpo_bytes -= used_before - used_after; 305 ASSERT3S(bpo->bpo_phys->bpo_bytes, >=, 0); 306 bpo->bpo_phys->bpo_comp -= comp_before - comp_after; 307 bpo->bpo_phys->bpo_uncomp -= 308 uncomp_before - uncomp_after; 309 } 310 311 bpobj_close(&sublist); 312 if (err) 313 break; 314 if (free) { 315 err = dmu_object_free(bpo->bpo_os, 316 objarray[blkoff], tx); 317 if (err) 318 break; 319 bpo->bpo_phys->bpo_num_subobjs--; 320 ASSERT3S(bpo->bpo_phys->bpo_num_subobjs, >=, 0); 321 } 322 } 323 if (dbuf) { 324 dmu_buf_rele(dbuf, FTAG); 325 dbuf = NULL; 326 } 327 if (free) { 328 VERIFY3U(0, ==, dmu_free_range(bpo->bpo_os, 329 bpo->bpo_phys->bpo_subobjs, 330 (i + 1) * sizeof (uint64_t), -1ULL, tx)); 331 } 332 333 out: 334 /* If there are no entries, there should be no bytes. */ 335 ASSERT(bpo->bpo_phys->bpo_num_blkptrs > 0 || 336 (bpo->bpo_havesubobj && bpo->bpo_phys->bpo_num_subobjs > 0) || 337 bpo->bpo_phys->bpo_bytes == 0); 338 339 mutex_exit(&bpo->bpo_lock); 340 return (err); 341 } 342 343 /* 344 * Iterate and remove the entries. If func returns nonzero, iteration 345 * will stop and that entry will not be removed. 346 */ 347 int 348 bpobj_iterate(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx) 349 { 350 return (bpobj_iterate_impl(bpo, func, arg, tx, B_TRUE)); 351 } 352 353 /* 354 * Iterate the entries. If func returns nonzero, iteration will stop. 355 */ 356 int 357 bpobj_iterate_nofree(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx) 358 { 359 return (bpobj_iterate_impl(bpo, func, arg, tx, B_FALSE)); 360 } 361 362 void 363 bpobj_enqueue_subobj(bpobj_t *bpo, uint64_t subobj, dmu_tx_t *tx) 364 { 365 bpobj_t subbpo; 366 uint64_t used, comp, uncomp, subsubobjs; 367 368 ASSERT(bpo->bpo_havesubobj); 369 ASSERT(bpo->bpo_havecomp); 370 ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj); 371 372 if (subobj == dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj) { 373 bpobj_decr_empty(bpo->bpo_os, tx); 374 return; 375 } 376 377 VERIFY3U(0, ==, bpobj_open(&subbpo, bpo->bpo_os, subobj)); 378 VERIFY3U(0, ==, bpobj_space(&subbpo, &used, &comp, &uncomp)); 379 380 if (used == 0) { 381 /* No point in having an empty subobj. */ 382 bpobj_close(&subbpo); 383 bpobj_free(bpo->bpo_os, subobj, tx); 384 return; 385 } 386 387 dmu_buf_will_dirty(bpo->bpo_dbuf, tx); 388 if (bpo->bpo_phys->bpo_subobjs == 0) { 389 bpo->bpo_phys->bpo_subobjs = dmu_object_alloc(bpo->bpo_os, 390 DMU_OT_BPOBJ_SUBOBJ, SPA_MAXBLOCKSIZE, DMU_OT_NONE, 0, tx); 391 } 392 393 dmu_object_info_t doi; 394 ASSERT0(dmu_object_info(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, &doi)); 395 ASSERT3U(doi.doi_type, ==, DMU_OT_BPOBJ_SUBOBJ); 396 397 mutex_enter(&bpo->bpo_lock); 398 dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, 399 bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj), 400 sizeof (subobj), &subobj, tx); 401 bpo->bpo_phys->bpo_num_subobjs++; 402 403 /* 404 * If subobj has only one block of subobjs, then move subobj's 405 * subobjs to bpo's subobj list directly. This reduces 406 * recursion in bpobj_iterate due to nested subobjs. 407 */ 408 subsubobjs = subbpo.bpo_phys->bpo_subobjs; 409 if (subsubobjs != 0) { 410 dmu_object_info_t doi; 411 412 VERIFY3U(0, ==, dmu_object_info(bpo->bpo_os, subsubobjs, &doi)); 413 if (doi.doi_max_offset == doi.doi_data_block_size) { 414 dmu_buf_t *subdb; 415 uint64_t numsubsub = subbpo.bpo_phys->bpo_num_subobjs; 416 417 VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, subsubobjs, 418 0, FTAG, &subdb, 0)); 419 /* 420 * Make sure that we are not asking dmu_write() 421 * to write more data than we have in our buffer. 422 */ 423 VERIFY3U(subdb->db_size, >=, 424 numsubsub * sizeof (subobj)); 425 dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs, 426 bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj), 427 numsubsub * sizeof (subobj), subdb->db_data, tx); 428 dmu_buf_rele(subdb, FTAG); 429 bpo->bpo_phys->bpo_num_subobjs += numsubsub; 430 431 dmu_buf_will_dirty(subbpo.bpo_dbuf, tx); 432 subbpo.bpo_phys->bpo_subobjs = 0; 433 VERIFY3U(0, ==, dmu_object_free(bpo->bpo_os, 434 subsubobjs, tx)); 435 } 436 } 437 bpo->bpo_phys->bpo_bytes += used; 438 bpo->bpo_phys->bpo_comp += comp; 439 bpo->bpo_phys->bpo_uncomp += uncomp; 440 mutex_exit(&bpo->bpo_lock); 441 442 bpobj_close(&subbpo); 443 } 444 445 void 446 bpobj_enqueue(bpobj_t *bpo, const blkptr_t *bp, dmu_tx_t *tx) 447 { 448 blkptr_t stored_bp = *bp; 449 uint64_t offset; 450 int blkoff; 451 blkptr_t *bparray; 452 453 ASSERT(!BP_IS_HOLE(bp)); 454 ASSERT(bpo->bpo_object != dmu_objset_pool(bpo->bpo_os)->dp_empty_bpobj); 455 456 /* We never need the fill count. */ 457 stored_bp.blk_fill = 0; 458 459 /* The bpobj will compress better if we can leave off the checksum */ 460 if (!BP_GET_DEDUP(bp)) 461 bzero(&stored_bp.blk_cksum, sizeof (stored_bp.blk_cksum)); 462 463 mutex_enter(&bpo->bpo_lock); 464 465 offset = bpo->bpo_phys->bpo_num_blkptrs * sizeof (stored_bp); 466 blkoff = P2PHASE(bpo->bpo_phys->bpo_num_blkptrs, bpo->bpo_epb); 467 468 if (bpo->bpo_cached_dbuf == NULL || 469 offset < bpo->bpo_cached_dbuf->db_offset || 470 offset >= bpo->bpo_cached_dbuf->db_offset + 471 bpo->bpo_cached_dbuf->db_size) { 472 if (bpo->bpo_cached_dbuf) 473 dmu_buf_rele(bpo->bpo_cached_dbuf, bpo); 474 VERIFY3U(0, ==, dmu_buf_hold(bpo->bpo_os, bpo->bpo_object, 475 offset, bpo, &bpo->bpo_cached_dbuf, 0)); 476 } 477 478 dmu_buf_will_dirty(bpo->bpo_cached_dbuf, tx); 479 bparray = bpo->bpo_cached_dbuf->db_data; 480 bparray[blkoff] = stored_bp; 481 482 dmu_buf_will_dirty(bpo->bpo_dbuf, tx); 483 bpo->bpo_phys->bpo_num_blkptrs++; 484 bpo->bpo_phys->bpo_bytes += 485 bp_get_dsize_sync(dmu_objset_spa(bpo->bpo_os), bp); 486 if (bpo->bpo_havecomp) { 487 bpo->bpo_phys->bpo_comp += BP_GET_PSIZE(bp); 488 bpo->bpo_phys->bpo_uncomp += BP_GET_UCSIZE(bp); 489 } 490 mutex_exit(&bpo->bpo_lock); 491 } 492 493 struct space_range_arg { 494 spa_t *spa; 495 uint64_t mintxg; 496 uint64_t maxtxg; 497 uint64_t used; 498 uint64_t comp; 499 uint64_t uncomp; 500 }; 501 502 /* ARGSUSED */ 503 static int 504 space_range_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 505 { 506 struct space_range_arg *sra = arg; 507 508 if (bp->blk_birth > sra->mintxg && bp->blk_birth <= sra->maxtxg) { 509 if (dsl_pool_sync_context(spa_get_dsl(sra->spa))) 510 sra->used += bp_get_dsize_sync(sra->spa, bp); 511 else 512 sra->used += bp_get_dsize(sra->spa, bp); 513 sra->comp += BP_GET_PSIZE(bp); 514 sra->uncomp += BP_GET_UCSIZE(bp); 515 } 516 return (0); 517 } 518 519 int 520 bpobj_space(bpobj_t *bpo, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 521 { 522 mutex_enter(&bpo->bpo_lock); 523 524 *usedp = bpo->bpo_phys->bpo_bytes; 525 if (bpo->bpo_havecomp) { 526 *compp = bpo->bpo_phys->bpo_comp; 527 *uncompp = bpo->bpo_phys->bpo_uncomp; 528 mutex_exit(&bpo->bpo_lock); 529 return (0); 530 } else { 531 mutex_exit(&bpo->bpo_lock); 532 return (bpobj_space_range(bpo, 0, UINT64_MAX, 533 usedp, compp, uncompp)); 534 } 535 } 536 537 /* 538 * Return the amount of space in the bpobj which is: 539 * mintxg < blk_birth <= maxtxg 540 */ 541 int 542 bpobj_space_range(bpobj_t *bpo, uint64_t mintxg, uint64_t maxtxg, 543 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 544 { 545 struct space_range_arg sra = { 0 }; 546 int err; 547 548 /* 549 * As an optimization, if they want the whole txg range, just 550 * get bpo_bytes rather than iterating over the bps. 551 */ 552 if (mintxg < TXG_INITIAL && maxtxg == UINT64_MAX && bpo->bpo_havecomp) 553 return (bpobj_space(bpo, usedp, compp, uncompp)); 554 555 sra.spa = dmu_objset_spa(bpo->bpo_os); 556 sra.mintxg = mintxg; 557 sra.maxtxg = maxtxg; 558 559 err = bpobj_iterate_nofree(bpo, space_range_cb, &sra, NULL); 560 *usedp = sra.used; 561 *compp = sra.comp; 562 *uncompp = sra.uncomp; 563 return (err); 564 } 565