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, 2016 by Delphix. All rights reserved. 24 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 25 * Copyright (c) 2014 Integros [integros.com] 26 */ 27 28 #include <sys/zio.h> 29 #include <sys/spa.h> 30 #include <sys/dmu.h> 31 #include <sys/zfs_context.h> 32 #include <sys/zap.h> 33 #include <sys/refcount.h> 34 #include <sys/zap_impl.h> 35 #include <sys/zap_leaf.h> 36 #include <sys/avl.h> 37 #include <sys/arc.h> 38 #include <sys/dmu_objset.h> 39 40 #ifdef _KERNEL 41 #include <sys/sunddi.h> 42 #endif 43 44 extern inline mzap_phys_t *zap_m_phys(zap_t *zap); 45 46 static int mzap_upgrade(zap_t **zapp, 47 void *tag, dmu_tx_t *tx, zap_flags_t flags); 48 49 uint64_t 50 zap_getflags(zap_t *zap) 51 { 52 if (zap->zap_ismicro) 53 return (0); 54 return (zap_f_phys(zap)->zap_flags); 55 } 56 57 int 58 zap_hashbits(zap_t *zap) 59 { 60 if (zap_getflags(zap) & ZAP_FLAG_HASH64) 61 return (48); 62 else 63 return (28); 64 } 65 66 uint32_t 67 zap_maxcd(zap_t *zap) 68 { 69 if (zap_getflags(zap) & ZAP_FLAG_HASH64) 70 return ((1<<16)-1); 71 else 72 return (-1U); 73 } 74 75 static uint64_t 76 zap_hash(zap_name_t *zn) 77 { 78 zap_t *zap = zn->zn_zap; 79 uint64_t h = 0; 80 81 if (zap_getflags(zap) & ZAP_FLAG_PRE_HASHED_KEY) { 82 ASSERT(zap_getflags(zap) & ZAP_FLAG_UINT64_KEY); 83 h = *(uint64_t *)zn->zn_key_orig; 84 } else { 85 h = zap->zap_salt; 86 ASSERT(h != 0); 87 ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 88 89 if (zap_getflags(zap) & ZAP_FLAG_UINT64_KEY) { 90 int i; 91 const uint64_t *wp = zn->zn_key_norm; 92 93 ASSERT(zn->zn_key_intlen == 8); 94 for (i = 0; i < zn->zn_key_norm_numints; wp++, i++) { 95 int j; 96 uint64_t word = *wp; 97 98 for (j = 0; j < zn->zn_key_intlen; j++) { 99 h = (h >> 8) ^ 100 zfs_crc64_table[(h ^ word) & 0xFF]; 101 word >>= NBBY; 102 } 103 } 104 } else { 105 int i, len; 106 const uint8_t *cp = zn->zn_key_norm; 107 108 /* 109 * We previously stored the terminating null on 110 * disk, but didn't hash it, so we need to 111 * continue to not hash it. (The 112 * zn_key_*_numints includes the terminating 113 * null for non-binary keys.) 114 */ 115 len = zn->zn_key_norm_numints - 1; 116 117 ASSERT(zn->zn_key_intlen == 1); 118 for (i = 0; i < len; cp++, i++) { 119 h = (h >> 8) ^ 120 zfs_crc64_table[(h ^ *cp) & 0xFF]; 121 } 122 } 123 } 124 /* 125 * Don't use all 64 bits, since we need some in the cookie for 126 * the collision differentiator. We MUST use the high bits, 127 * since those are the ones that we first pay attention to when 128 * chosing the bucket. 129 */ 130 h &= ~((1ULL << (64 - zap_hashbits(zap))) - 1); 131 132 return (h); 133 } 134 135 static int 136 zap_normalize(zap_t *zap, const char *name, char *namenorm) 137 { 138 size_t inlen, outlen; 139 int err; 140 141 ASSERT(!(zap_getflags(zap) & ZAP_FLAG_UINT64_KEY)); 142 143 inlen = strlen(name) + 1; 144 outlen = ZAP_MAXNAMELEN; 145 146 err = 0; 147 (void) u8_textprep_str((char *)name, &inlen, namenorm, &outlen, 148 zap->zap_normflags | U8_TEXTPREP_IGNORE_NULL | 149 U8_TEXTPREP_IGNORE_INVALID, U8_UNICODE_LATEST, &err); 150 151 return (err); 152 } 153 154 boolean_t 155 zap_match(zap_name_t *zn, const char *matchname) 156 { 157 ASSERT(!(zap_getflags(zn->zn_zap) & ZAP_FLAG_UINT64_KEY)); 158 159 if (zn->zn_matchtype == MT_FIRST) { 160 char norm[ZAP_MAXNAMELEN]; 161 162 if (zap_normalize(zn->zn_zap, matchname, norm) != 0) 163 return (B_FALSE); 164 165 return (strcmp(zn->zn_key_norm, norm) == 0); 166 } else { 167 /* MT_BEST or MT_EXACT */ 168 return (strcmp(zn->zn_key_orig, matchname) == 0); 169 } 170 } 171 172 void 173 zap_name_free(zap_name_t *zn) 174 { 175 kmem_free(zn, sizeof (zap_name_t)); 176 } 177 178 zap_name_t * 179 zap_name_alloc(zap_t *zap, const char *key, matchtype_t mt) 180 { 181 zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP); 182 183 zn->zn_zap = zap; 184 zn->zn_key_intlen = sizeof (*key); 185 zn->zn_key_orig = key; 186 zn->zn_key_orig_numints = strlen(zn->zn_key_orig) + 1; 187 zn->zn_matchtype = mt; 188 if (zap->zap_normflags) { 189 if (zap_normalize(zap, key, zn->zn_normbuf) != 0) { 190 zap_name_free(zn); 191 return (NULL); 192 } 193 zn->zn_key_norm = zn->zn_normbuf; 194 zn->zn_key_norm_numints = strlen(zn->zn_key_norm) + 1; 195 } else { 196 if (mt != MT_EXACT) { 197 zap_name_free(zn); 198 return (NULL); 199 } 200 zn->zn_key_norm = zn->zn_key_orig; 201 zn->zn_key_norm_numints = zn->zn_key_orig_numints; 202 } 203 204 zn->zn_hash = zap_hash(zn); 205 return (zn); 206 } 207 208 zap_name_t * 209 zap_name_alloc_uint64(zap_t *zap, const uint64_t *key, int numints) 210 { 211 zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP); 212 213 ASSERT(zap->zap_normflags == 0); 214 zn->zn_zap = zap; 215 zn->zn_key_intlen = sizeof (*key); 216 zn->zn_key_orig = zn->zn_key_norm = key; 217 zn->zn_key_orig_numints = zn->zn_key_norm_numints = numints; 218 zn->zn_matchtype = MT_EXACT; 219 220 zn->zn_hash = zap_hash(zn); 221 return (zn); 222 } 223 224 static void 225 mzap_byteswap(mzap_phys_t *buf, size_t size) 226 { 227 int i, max; 228 buf->mz_block_type = BSWAP_64(buf->mz_block_type); 229 buf->mz_salt = BSWAP_64(buf->mz_salt); 230 buf->mz_normflags = BSWAP_64(buf->mz_normflags); 231 max = (size / MZAP_ENT_LEN) - 1; 232 for (i = 0; i < max; i++) { 233 buf->mz_chunk[i].mze_value = 234 BSWAP_64(buf->mz_chunk[i].mze_value); 235 buf->mz_chunk[i].mze_cd = 236 BSWAP_32(buf->mz_chunk[i].mze_cd); 237 } 238 } 239 240 void 241 zap_byteswap(void *buf, size_t size) 242 { 243 uint64_t block_type; 244 245 block_type = *(uint64_t *)buf; 246 247 if (block_type == ZBT_MICRO || block_type == BSWAP_64(ZBT_MICRO)) { 248 /* ASSERT(magic == ZAP_LEAF_MAGIC); */ 249 mzap_byteswap(buf, size); 250 } else { 251 fzap_byteswap(buf, size); 252 } 253 } 254 255 static int 256 mze_compare(const void *arg1, const void *arg2) 257 { 258 const mzap_ent_t *mze1 = arg1; 259 const mzap_ent_t *mze2 = arg2; 260 261 if (mze1->mze_hash > mze2->mze_hash) 262 return (+1); 263 if (mze1->mze_hash < mze2->mze_hash) 264 return (-1); 265 if (mze1->mze_cd > mze2->mze_cd) 266 return (+1); 267 if (mze1->mze_cd < mze2->mze_cd) 268 return (-1); 269 return (0); 270 } 271 272 static int 273 mze_insert(zap_t *zap, int chunkid, uint64_t hash) 274 { 275 mzap_ent_t *mze; 276 avl_index_t idx; 277 278 ASSERT(zap->zap_ismicro); 279 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 280 281 mze = kmem_alloc(sizeof (mzap_ent_t), KM_SLEEP); 282 mze->mze_chunkid = chunkid; 283 mze->mze_hash = hash; 284 mze->mze_cd = MZE_PHYS(zap, mze)->mze_cd; 285 ASSERT(MZE_PHYS(zap, mze)->mze_name[0] != 0); 286 if (avl_find(&zap->zap_m.zap_avl, mze, &idx) != NULL) { 287 kmem_free(mze, sizeof (mzap_ent_t)); 288 return (EEXIST); 289 } 290 avl_insert(&zap->zap_m.zap_avl, mze, idx); 291 return (0); 292 } 293 294 static mzap_ent_t * 295 mze_find(zap_name_t *zn) 296 { 297 mzap_ent_t mze_tofind; 298 mzap_ent_t *mze; 299 avl_index_t idx; 300 avl_tree_t *avl = &zn->zn_zap->zap_m.zap_avl; 301 302 ASSERT(zn->zn_zap->zap_ismicro); 303 ASSERT(RW_LOCK_HELD(&zn->zn_zap->zap_rwlock)); 304 305 mze_tofind.mze_hash = zn->zn_hash; 306 mze_tofind.mze_cd = 0; 307 308 again: 309 mze = avl_find(avl, &mze_tofind, &idx); 310 if (mze == NULL) 311 mze = avl_nearest(avl, idx, AVL_AFTER); 312 for (; mze && mze->mze_hash == zn->zn_hash; mze = AVL_NEXT(avl, mze)) { 313 ASSERT3U(mze->mze_cd, ==, MZE_PHYS(zn->zn_zap, mze)->mze_cd); 314 if (zap_match(zn, MZE_PHYS(zn->zn_zap, mze)->mze_name)) 315 return (mze); 316 } 317 if (zn->zn_matchtype == MT_BEST) { 318 zn->zn_matchtype = MT_FIRST; 319 goto again; 320 } 321 return (NULL); 322 } 323 324 static uint32_t 325 mze_find_unused_cd(zap_t *zap, uint64_t hash) 326 { 327 mzap_ent_t mze_tofind; 328 mzap_ent_t *mze; 329 avl_index_t idx; 330 avl_tree_t *avl = &zap->zap_m.zap_avl; 331 uint32_t cd; 332 333 ASSERT(zap->zap_ismicro); 334 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); 335 336 mze_tofind.mze_hash = hash; 337 mze_tofind.mze_cd = 0; 338 339 cd = 0; 340 for (mze = avl_find(avl, &mze_tofind, &idx); 341 mze && mze->mze_hash == hash; mze = AVL_NEXT(avl, mze)) { 342 if (mze->mze_cd != cd) 343 break; 344 cd++; 345 } 346 347 return (cd); 348 } 349 350 static void 351 mze_remove(zap_t *zap, mzap_ent_t *mze) 352 { 353 ASSERT(zap->zap_ismicro); 354 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 355 356 avl_remove(&zap->zap_m.zap_avl, mze); 357 kmem_free(mze, sizeof (mzap_ent_t)); 358 } 359 360 static void 361 mze_destroy(zap_t *zap) 362 { 363 mzap_ent_t *mze; 364 void *avlcookie = NULL; 365 366 while (mze = avl_destroy_nodes(&zap->zap_m.zap_avl, &avlcookie)) 367 kmem_free(mze, sizeof (mzap_ent_t)); 368 avl_destroy(&zap->zap_m.zap_avl); 369 } 370 371 static zap_t * 372 mzap_open(objset_t *os, uint64_t obj, dmu_buf_t *db) 373 { 374 zap_t *winner; 375 zap_t *zap; 376 int i; 377 uint64_t *zap_hdr = (uint64_t *)db->db_data; 378 uint64_t zap_block_type = zap_hdr[0]; 379 uint64_t zap_magic = zap_hdr[1]; 380 381 ASSERT3U(MZAP_ENT_LEN, ==, sizeof (mzap_ent_phys_t)); 382 383 zap = kmem_zalloc(sizeof (zap_t), KM_SLEEP); 384 rw_init(&zap->zap_rwlock, 0, 0, 0); 385 rw_enter(&zap->zap_rwlock, RW_WRITER); 386 zap->zap_objset = os; 387 zap->zap_object = obj; 388 zap->zap_dbuf = db; 389 390 if (zap_block_type != ZBT_MICRO) { 391 mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, 0, 0); 392 zap->zap_f.zap_block_shift = highbit64(db->db_size) - 1; 393 if (zap_block_type != ZBT_HEADER || zap_magic != ZAP_MAGIC) { 394 winner = NULL; /* No actual winner here... */ 395 goto handle_winner; 396 } 397 } else { 398 zap->zap_ismicro = TRUE; 399 } 400 401 /* 402 * Make sure that zap_ismicro is set before we let others see 403 * it, because zap_lockdir() checks zap_ismicro without the lock 404 * held. 405 */ 406 dmu_buf_init_user(&zap->zap_dbu, zap_evict_sync, NULL, &zap->zap_dbuf); 407 winner = dmu_buf_set_user(db, &zap->zap_dbu); 408 409 if (winner != NULL) 410 goto handle_winner; 411 412 if (zap->zap_ismicro) { 413 zap->zap_salt = zap_m_phys(zap)->mz_salt; 414 zap->zap_normflags = zap_m_phys(zap)->mz_normflags; 415 zap->zap_m.zap_num_chunks = db->db_size / MZAP_ENT_LEN - 1; 416 avl_create(&zap->zap_m.zap_avl, mze_compare, 417 sizeof (mzap_ent_t), offsetof(mzap_ent_t, mze_node)); 418 419 for (i = 0; i < zap->zap_m.zap_num_chunks; i++) { 420 mzap_ent_phys_t *mze = 421 &zap_m_phys(zap)->mz_chunk[i]; 422 if (mze->mze_name[0]) { 423 zap_name_t *zn; 424 425 zn = zap_name_alloc(zap, mze->mze_name, 426 MT_EXACT); 427 if (mze_insert(zap, i, zn->zn_hash) == 0) 428 zap->zap_m.zap_num_entries++; 429 else { 430 printf("ZFS WARNING: Duplicated ZAP " 431 "entry detected (%s).\n", 432 mze->mze_name); 433 } 434 zap_name_free(zn); 435 } 436 } 437 } else { 438 zap->zap_salt = zap_f_phys(zap)->zap_salt; 439 zap->zap_normflags = zap_f_phys(zap)->zap_normflags; 440 441 ASSERT3U(sizeof (struct zap_leaf_header), ==, 442 2*ZAP_LEAF_CHUNKSIZE); 443 444 /* 445 * The embedded pointer table should not overlap the 446 * other members. 447 */ 448 ASSERT3P(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), >, 449 &zap_f_phys(zap)->zap_salt); 450 451 /* 452 * The embedded pointer table should end at the end of 453 * the block 454 */ 455 ASSERT3U((uintptr_t)&ZAP_EMBEDDED_PTRTBL_ENT(zap, 456 1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)) - 457 (uintptr_t)zap_f_phys(zap), ==, 458 zap->zap_dbuf->db_size); 459 } 460 rw_exit(&zap->zap_rwlock); 461 return (zap); 462 463 handle_winner: 464 rw_exit(&zap->zap_rwlock); 465 rw_destroy(&zap->zap_rwlock); 466 if (!zap->zap_ismicro) 467 mutex_destroy(&zap->zap_f.zap_num_entries_mtx); 468 kmem_free(zap, sizeof (zap_t)); 469 return (winner); 470 } 471 472 static int 473 zap_lockdir_impl(dmu_buf_t *db, void *tag, dmu_tx_t *tx, 474 krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp) 475 { 476 zap_t *zap; 477 krw_t lt; 478 479 ASSERT0(db->db_offset); 480 objset_t *os = dmu_buf_get_objset(db); 481 uint64_t obj = db->db_object; 482 483 *zapp = NULL; 484 485 #ifdef ZFS_DEBUG 486 { 487 dmu_object_info_t doi; 488 dmu_object_info_from_db(db, &doi); 489 ASSERT3U(DMU_OT_BYTESWAP(doi.doi_type), ==, DMU_BSWAP_ZAP); 490 } 491 #endif 492 493 zap = dmu_buf_get_user(db); 494 if (zap == NULL) { 495 zap = mzap_open(os, obj, db); 496 if (zap == NULL) { 497 /* 498 * mzap_open() didn't like what it saw on-disk. 499 * Check for corruption! 500 */ 501 return (SET_ERROR(EIO)); 502 } 503 } 504 505 /* 506 * We're checking zap_ismicro without the lock held, in order to 507 * tell what type of lock we want. Once we have some sort of 508 * lock, see if it really is the right type. In practice this 509 * can only be different if it was upgraded from micro to fat, 510 * and micro wanted WRITER but fat only needs READER. 511 */ 512 lt = (!zap->zap_ismicro && fatreader) ? RW_READER : lti; 513 rw_enter(&zap->zap_rwlock, lt); 514 if (lt != ((!zap->zap_ismicro && fatreader) ? RW_READER : lti)) { 515 /* it was upgraded, now we only need reader */ 516 ASSERT(lt == RW_WRITER); 517 ASSERT(RW_READER == 518 (!zap->zap_ismicro && fatreader) ? RW_READER : lti); 519 rw_downgrade(&zap->zap_rwlock); 520 lt = RW_READER; 521 } 522 523 zap->zap_objset = os; 524 525 if (lt == RW_WRITER) 526 dmu_buf_will_dirty(db, tx); 527 528 ASSERT3P(zap->zap_dbuf, ==, db); 529 530 ASSERT(!zap->zap_ismicro || 531 zap->zap_m.zap_num_entries <= zap->zap_m.zap_num_chunks); 532 if (zap->zap_ismicro && tx && adding && 533 zap->zap_m.zap_num_entries == zap->zap_m.zap_num_chunks) { 534 uint64_t newsz = db->db_size + SPA_MINBLOCKSIZE; 535 if (newsz > MZAP_MAX_BLKSZ) { 536 dprintf("upgrading obj %llu: num_entries=%u\n", 537 obj, zap->zap_m.zap_num_entries); 538 *zapp = zap; 539 int err = mzap_upgrade(zapp, tag, tx, 0); 540 if (err != 0) 541 rw_exit(&zap->zap_rwlock); 542 return (err); 543 } 544 VERIFY0(dmu_object_set_blocksize(os, obj, newsz, 0, tx)); 545 zap->zap_m.zap_num_chunks = 546 db->db_size / MZAP_ENT_LEN - 1; 547 } 548 549 *zapp = zap; 550 return (0); 551 } 552 553 static int 554 zap_lockdir_by_dnode(dnode_t *dn, dmu_tx_t *tx, 555 krw_t lti, boolean_t fatreader, boolean_t adding, void *tag, zap_t **zapp) 556 { 557 dmu_buf_t *db; 558 int err; 559 560 err = dmu_buf_hold_by_dnode(dn, 0, tag, &db, DMU_READ_NO_PREFETCH); 561 if (err != 0) { 562 return (err); 563 } 564 err = zap_lockdir_impl(db, tag, tx, lti, fatreader, adding, zapp); 565 if (err != 0) { 566 dmu_buf_rele(db, tag); 567 } 568 return (err); 569 } 570 571 int 572 zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx, 573 krw_t lti, boolean_t fatreader, boolean_t adding, void *tag, zap_t **zapp) 574 { 575 dmu_buf_t *db; 576 int err; 577 578 err = dmu_buf_hold(os, obj, 0, tag, &db, DMU_READ_NO_PREFETCH); 579 if (err != 0) 580 return (err); 581 err = zap_lockdir_impl(db, tag, tx, lti, fatreader, adding, zapp); 582 if (err != 0) 583 dmu_buf_rele(db, tag); 584 return (err); 585 } 586 587 void 588 zap_unlockdir(zap_t *zap, void *tag) 589 { 590 rw_exit(&zap->zap_rwlock); 591 dmu_buf_rele(zap->zap_dbuf, tag); 592 } 593 594 static int 595 mzap_upgrade(zap_t **zapp, void *tag, dmu_tx_t *tx, zap_flags_t flags) 596 { 597 mzap_phys_t *mzp; 598 int i, sz, nchunks; 599 int err = 0; 600 zap_t *zap = *zapp; 601 602 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 603 604 sz = zap->zap_dbuf->db_size; 605 mzp = zio_buf_alloc(sz); 606 bcopy(zap->zap_dbuf->db_data, mzp, sz); 607 nchunks = zap->zap_m.zap_num_chunks; 608 609 if (!flags) { 610 err = dmu_object_set_blocksize(zap->zap_objset, zap->zap_object, 611 1ULL << fzap_default_block_shift, 0, tx); 612 if (err) { 613 zio_buf_free(mzp, sz); 614 return (err); 615 } 616 } 617 618 dprintf("upgrading obj=%llu with %u chunks\n", 619 zap->zap_object, nchunks); 620 /* XXX destroy the avl later, so we can use the stored hash value */ 621 mze_destroy(zap); 622 623 fzap_upgrade(zap, tx, flags); 624 625 for (i = 0; i < nchunks; i++) { 626 mzap_ent_phys_t *mze = &mzp->mz_chunk[i]; 627 zap_name_t *zn; 628 if (mze->mze_name[0] == 0) 629 continue; 630 dprintf("adding %s=%llu\n", 631 mze->mze_name, mze->mze_value); 632 zn = zap_name_alloc(zap, mze->mze_name, MT_EXACT); 633 err = fzap_add_cd(zn, 8, 1, &mze->mze_value, mze->mze_cd, 634 tag, tx); 635 zap = zn->zn_zap; /* fzap_add_cd() may change zap */ 636 zap_name_free(zn); 637 if (err) 638 break; 639 } 640 zio_buf_free(mzp, sz); 641 *zapp = zap; 642 return (err); 643 } 644 645 void 646 mzap_create_impl(objset_t *os, uint64_t obj, int normflags, zap_flags_t flags, 647 dmu_tx_t *tx) 648 { 649 dmu_buf_t *db; 650 mzap_phys_t *zp; 651 652 VERIFY(0 == dmu_buf_hold(os, obj, 0, FTAG, &db, DMU_READ_NO_PREFETCH)); 653 654 #ifdef ZFS_DEBUG 655 { 656 dmu_object_info_t doi; 657 dmu_object_info_from_db(db, &doi); 658 ASSERT3U(DMU_OT_BYTESWAP(doi.doi_type), ==, DMU_BSWAP_ZAP); 659 } 660 #endif 661 662 dmu_buf_will_dirty(db, tx); 663 zp = db->db_data; 664 zp->mz_block_type = ZBT_MICRO; 665 zp->mz_salt = ((uintptr_t)db ^ (uintptr_t)tx ^ (obj << 1)) | 1ULL; 666 zp->mz_normflags = normflags; 667 dmu_buf_rele(db, FTAG); 668 669 if (flags != 0) { 670 zap_t *zap; 671 /* Only fat zap supports flags; upgrade immediately. */ 672 VERIFY(0 == zap_lockdir(os, obj, tx, RW_WRITER, 673 B_FALSE, B_FALSE, FTAG, &zap)); 674 VERIFY3U(0, ==, mzap_upgrade(&zap, FTAG, tx, flags)); 675 zap_unlockdir(zap, FTAG); 676 } 677 } 678 679 int 680 zap_create_claim(objset_t *os, uint64_t obj, dmu_object_type_t ot, 681 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 682 { 683 return (zap_create_claim_norm(os, obj, 684 0, ot, bonustype, bonuslen, tx)); 685 } 686 687 int 688 zap_create_claim_norm(objset_t *os, uint64_t obj, int normflags, 689 dmu_object_type_t ot, 690 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 691 { 692 int err; 693 694 err = dmu_object_claim(os, obj, ot, 0, bonustype, bonuslen, tx); 695 if (err != 0) 696 return (err); 697 mzap_create_impl(os, obj, normflags, 0, tx); 698 return (0); 699 } 700 701 uint64_t 702 zap_create(objset_t *os, dmu_object_type_t ot, 703 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 704 { 705 return (zap_create_norm(os, 0, ot, bonustype, bonuslen, tx)); 706 } 707 708 uint64_t 709 zap_create_norm(objset_t *os, int normflags, dmu_object_type_t ot, 710 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 711 { 712 uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx); 713 714 mzap_create_impl(os, obj, normflags, 0, tx); 715 return (obj); 716 } 717 718 uint64_t 719 zap_create_flags(objset_t *os, int normflags, zap_flags_t flags, 720 dmu_object_type_t ot, int leaf_blockshift, int indirect_blockshift, 721 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 722 { 723 uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx); 724 725 ASSERT(leaf_blockshift >= SPA_MINBLOCKSHIFT && 726 leaf_blockshift <= SPA_OLD_MAXBLOCKSHIFT && 727 indirect_blockshift >= SPA_MINBLOCKSHIFT && 728 indirect_blockshift <= SPA_OLD_MAXBLOCKSHIFT); 729 730 VERIFY(dmu_object_set_blocksize(os, obj, 731 1ULL << leaf_blockshift, indirect_blockshift, tx) == 0); 732 733 mzap_create_impl(os, obj, normflags, flags, tx); 734 return (obj); 735 } 736 737 int 738 zap_destroy(objset_t *os, uint64_t zapobj, dmu_tx_t *tx) 739 { 740 /* 741 * dmu_object_free will free the object number and free the 742 * data. Freeing the data will cause our pageout function to be 743 * called, which will destroy our data (zap_leaf_t's and zap_t). 744 */ 745 746 return (dmu_object_free(os, zapobj, tx)); 747 } 748 749 void 750 zap_evict_sync(void *dbu) 751 { 752 zap_t *zap = dbu; 753 754 rw_destroy(&zap->zap_rwlock); 755 756 if (zap->zap_ismicro) 757 mze_destroy(zap); 758 else 759 mutex_destroy(&zap->zap_f.zap_num_entries_mtx); 760 761 kmem_free(zap, sizeof (zap_t)); 762 } 763 764 int 765 zap_count(objset_t *os, uint64_t zapobj, uint64_t *count) 766 { 767 zap_t *zap; 768 int err; 769 770 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 771 if (err) 772 return (err); 773 if (!zap->zap_ismicro) { 774 err = fzap_count(zap, count); 775 } else { 776 *count = zap->zap_m.zap_num_entries; 777 } 778 zap_unlockdir(zap, FTAG); 779 return (err); 780 } 781 782 /* 783 * zn may be NULL; if not specified, it will be computed if needed. 784 * See also the comment above zap_entry_normalization_conflict(). 785 */ 786 static boolean_t 787 mzap_normalization_conflict(zap_t *zap, zap_name_t *zn, mzap_ent_t *mze) 788 { 789 mzap_ent_t *other; 790 int direction = AVL_BEFORE; 791 boolean_t allocdzn = B_FALSE; 792 793 if (zap->zap_normflags == 0) 794 return (B_FALSE); 795 796 again: 797 for (other = avl_walk(&zap->zap_m.zap_avl, mze, direction); 798 other && other->mze_hash == mze->mze_hash; 799 other = avl_walk(&zap->zap_m.zap_avl, other, direction)) { 800 801 if (zn == NULL) { 802 zn = zap_name_alloc(zap, MZE_PHYS(zap, mze)->mze_name, 803 MT_FIRST); 804 allocdzn = B_TRUE; 805 } 806 if (zap_match(zn, MZE_PHYS(zap, other)->mze_name)) { 807 if (allocdzn) 808 zap_name_free(zn); 809 return (B_TRUE); 810 } 811 } 812 813 if (direction == AVL_BEFORE) { 814 direction = AVL_AFTER; 815 goto again; 816 } 817 818 if (allocdzn) 819 zap_name_free(zn); 820 return (B_FALSE); 821 } 822 823 /* 824 * Routines for manipulating attributes. 825 */ 826 827 int 828 zap_lookup(objset_t *os, uint64_t zapobj, const char *name, 829 uint64_t integer_size, uint64_t num_integers, void *buf) 830 { 831 return (zap_lookup_norm(os, zapobj, name, integer_size, 832 num_integers, buf, MT_EXACT, NULL, 0, NULL)); 833 } 834 835 static int 836 zap_lookup_impl(zap_t *zap, const char *name, 837 uint64_t integer_size, uint64_t num_integers, void *buf, 838 matchtype_t mt, char *realname, int rn_len, 839 boolean_t *ncp) 840 { 841 int err = 0; 842 mzap_ent_t *mze; 843 zap_name_t *zn; 844 845 zn = zap_name_alloc(zap, name, mt); 846 if (zn == NULL) 847 return (SET_ERROR(ENOTSUP)); 848 849 if (!zap->zap_ismicro) { 850 err = fzap_lookup(zn, integer_size, num_integers, buf, 851 realname, rn_len, ncp); 852 } else { 853 mze = mze_find(zn); 854 if (mze == NULL) { 855 err = SET_ERROR(ENOENT); 856 } else { 857 if (num_integers < 1) { 858 err = SET_ERROR(EOVERFLOW); 859 } else if (integer_size != 8) { 860 err = SET_ERROR(EINVAL); 861 } else { 862 *(uint64_t *)buf = 863 MZE_PHYS(zap, mze)->mze_value; 864 if (realname != NULL) 865 (void) strlcpy(realname, 866 MZE_PHYS(zap, mze)->mze_name, rn_len); 867 if (ncp) { 868 *ncp = mzap_normalization_conflict(zap, 869 zn, mze); 870 } 871 } 872 } 873 } 874 zap_name_free(zn); 875 return (err); 876 } 877 878 int 879 zap_lookup_norm(objset_t *os, uint64_t zapobj, const char *name, 880 uint64_t integer_size, uint64_t num_integers, void *buf, 881 matchtype_t mt, char *realname, int rn_len, 882 boolean_t *ncp) 883 { 884 zap_t *zap; 885 int err; 886 887 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 888 if (err != 0) 889 return (err); 890 err = zap_lookup_impl(zap, name, integer_size, 891 num_integers, buf, mt, realname, rn_len, ncp); 892 zap_unlockdir(zap, FTAG); 893 return (err); 894 } 895 896 int 897 zap_lookup_by_dnode(dnode_t *dn, const char *name, 898 uint64_t integer_size, uint64_t num_integers, void *buf) 899 { 900 return (zap_lookup_norm_by_dnode(dn, name, integer_size, 901 num_integers, buf, MT_EXACT, NULL, 0, NULL)); 902 } 903 904 int 905 zap_lookup_norm_by_dnode(dnode_t *dn, const char *name, 906 uint64_t integer_size, uint64_t num_integers, void *buf, 907 matchtype_t mt, char *realname, int rn_len, 908 boolean_t *ncp) 909 { 910 zap_t *zap; 911 int err; 912 913 err = zap_lockdir_by_dnode(dn, NULL, RW_READER, TRUE, FALSE, 914 FTAG, &zap); 915 if (err != 0) 916 return (err); 917 err = zap_lookup_impl(zap, name, integer_size, 918 num_integers, buf, mt, realname, rn_len, ncp); 919 zap_unlockdir(zap, FTAG); 920 return (err); 921 } 922 923 int 924 zap_prefetch_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 925 int key_numints) 926 { 927 zap_t *zap; 928 int err; 929 zap_name_t *zn; 930 931 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 932 if (err) 933 return (err); 934 zn = zap_name_alloc_uint64(zap, key, key_numints); 935 if (zn == NULL) { 936 zap_unlockdir(zap, FTAG); 937 return (SET_ERROR(ENOTSUP)); 938 } 939 940 fzap_prefetch(zn); 941 zap_name_free(zn); 942 zap_unlockdir(zap, FTAG); 943 return (err); 944 } 945 946 int 947 zap_lookup_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 948 int key_numints, uint64_t integer_size, uint64_t num_integers, void *buf) 949 { 950 zap_t *zap; 951 int err; 952 zap_name_t *zn; 953 954 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 955 if (err) 956 return (err); 957 zn = zap_name_alloc_uint64(zap, key, key_numints); 958 if (zn == NULL) { 959 zap_unlockdir(zap, FTAG); 960 return (SET_ERROR(ENOTSUP)); 961 } 962 963 err = fzap_lookup(zn, integer_size, num_integers, buf, 964 NULL, 0, NULL); 965 zap_name_free(zn); 966 zap_unlockdir(zap, FTAG); 967 return (err); 968 } 969 970 int 971 zap_contains(objset_t *os, uint64_t zapobj, const char *name) 972 { 973 int err = zap_lookup_norm(os, zapobj, name, 0, 974 0, NULL, MT_EXACT, NULL, 0, NULL); 975 if (err == EOVERFLOW || err == EINVAL) 976 err = 0; /* found, but skipped reading the value */ 977 return (err); 978 } 979 980 int 981 zap_length(objset_t *os, uint64_t zapobj, const char *name, 982 uint64_t *integer_size, uint64_t *num_integers) 983 { 984 zap_t *zap; 985 int err; 986 mzap_ent_t *mze; 987 zap_name_t *zn; 988 989 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 990 if (err) 991 return (err); 992 zn = zap_name_alloc(zap, name, MT_EXACT); 993 if (zn == NULL) { 994 zap_unlockdir(zap, FTAG); 995 return (SET_ERROR(ENOTSUP)); 996 } 997 if (!zap->zap_ismicro) { 998 err = fzap_length(zn, integer_size, num_integers); 999 } else { 1000 mze = mze_find(zn); 1001 if (mze == NULL) { 1002 err = SET_ERROR(ENOENT); 1003 } else { 1004 if (integer_size) 1005 *integer_size = 8; 1006 if (num_integers) 1007 *num_integers = 1; 1008 } 1009 } 1010 zap_name_free(zn); 1011 zap_unlockdir(zap, FTAG); 1012 return (err); 1013 } 1014 1015 int 1016 zap_length_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 1017 int key_numints, uint64_t *integer_size, uint64_t *num_integers) 1018 { 1019 zap_t *zap; 1020 int err; 1021 zap_name_t *zn; 1022 1023 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 1024 if (err) 1025 return (err); 1026 zn = zap_name_alloc_uint64(zap, key, key_numints); 1027 if (zn == NULL) { 1028 zap_unlockdir(zap, FTAG); 1029 return (SET_ERROR(ENOTSUP)); 1030 } 1031 err = fzap_length(zn, integer_size, num_integers); 1032 zap_name_free(zn); 1033 zap_unlockdir(zap, FTAG); 1034 return (err); 1035 } 1036 1037 static void 1038 mzap_addent(zap_name_t *zn, uint64_t value) 1039 { 1040 int i; 1041 zap_t *zap = zn->zn_zap; 1042 int start = zap->zap_m.zap_alloc_next; 1043 uint32_t cd; 1044 1045 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 1046 1047 #ifdef ZFS_DEBUG 1048 for (i = 0; i < zap->zap_m.zap_num_chunks; i++) { 1049 mzap_ent_phys_t *mze = &zap_m_phys(zap)->mz_chunk[i]; 1050 ASSERT(strcmp(zn->zn_key_orig, mze->mze_name) != 0); 1051 } 1052 #endif 1053 1054 cd = mze_find_unused_cd(zap, zn->zn_hash); 1055 /* given the limited size of the microzap, this can't happen */ 1056 ASSERT(cd < zap_maxcd(zap)); 1057 1058 again: 1059 for (i = start; i < zap->zap_m.zap_num_chunks; i++) { 1060 mzap_ent_phys_t *mze = &zap_m_phys(zap)->mz_chunk[i]; 1061 if (mze->mze_name[0] == 0) { 1062 mze->mze_value = value; 1063 mze->mze_cd = cd; 1064 (void) strcpy(mze->mze_name, zn->zn_key_orig); 1065 zap->zap_m.zap_num_entries++; 1066 zap->zap_m.zap_alloc_next = i+1; 1067 if (zap->zap_m.zap_alloc_next == 1068 zap->zap_m.zap_num_chunks) 1069 zap->zap_m.zap_alloc_next = 0; 1070 VERIFY(0 == mze_insert(zap, i, zn->zn_hash)); 1071 return; 1072 } 1073 } 1074 if (start != 0) { 1075 start = 0; 1076 goto again; 1077 } 1078 ASSERT(!"out of entries!"); 1079 } 1080 1081 int 1082 zap_add(objset_t *os, uint64_t zapobj, const char *key, 1083 int integer_size, uint64_t num_integers, 1084 const void *val, dmu_tx_t *tx) 1085 { 1086 zap_t *zap; 1087 int err; 1088 mzap_ent_t *mze; 1089 const uint64_t *intval = val; 1090 zap_name_t *zn; 1091 1092 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1093 if (err) 1094 return (err); 1095 zn = zap_name_alloc(zap, key, MT_EXACT); 1096 if (zn == NULL) { 1097 zap_unlockdir(zap, FTAG); 1098 return (SET_ERROR(ENOTSUP)); 1099 } 1100 if (!zap->zap_ismicro) { 1101 err = fzap_add(zn, integer_size, num_integers, val, FTAG, tx); 1102 zap = zn->zn_zap; /* fzap_add() may change zap */ 1103 } else if (integer_size != 8 || num_integers != 1 || 1104 strlen(key) >= MZAP_NAME_LEN) { 1105 err = mzap_upgrade(&zn->zn_zap, FTAG, tx, 0); 1106 if (err == 0) { 1107 err = fzap_add(zn, integer_size, num_integers, val, 1108 FTAG, tx); 1109 } 1110 zap = zn->zn_zap; /* fzap_add() may change zap */ 1111 } else { 1112 mze = mze_find(zn); 1113 if (mze != NULL) { 1114 err = SET_ERROR(EEXIST); 1115 } else { 1116 mzap_addent(zn, *intval); 1117 } 1118 } 1119 ASSERT(zap == zn->zn_zap); 1120 zap_name_free(zn); 1121 if (zap != NULL) /* may be NULL if fzap_add() failed */ 1122 zap_unlockdir(zap, FTAG); 1123 return (err); 1124 } 1125 1126 int 1127 zap_add_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 1128 int key_numints, int integer_size, uint64_t num_integers, 1129 const void *val, dmu_tx_t *tx) 1130 { 1131 zap_t *zap; 1132 int err; 1133 zap_name_t *zn; 1134 1135 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1136 if (err) 1137 return (err); 1138 zn = zap_name_alloc_uint64(zap, key, key_numints); 1139 if (zn == NULL) { 1140 zap_unlockdir(zap, FTAG); 1141 return (SET_ERROR(ENOTSUP)); 1142 } 1143 err = fzap_add(zn, integer_size, num_integers, val, FTAG, tx); 1144 zap = zn->zn_zap; /* fzap_add() may change zap */ 1145 zap_name_free(zn); 1146 if (zap != NULL) /* may be NULL if fzap_add() failed */ 1147 zap_unlockdir(zap, FTAG); 1148 return (err); 1149 } 1150 1151 int 1152 zap_update(objset_t *os, uint64_t zapobj, const char *name, 1153 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx) 1154 { 1155 zap_t *zap; 1156 mzap_ent_t *mze; 1157 uint64_t oldval; 1158 const uint64_t *intval = val; 1159 zap_name_t *zn; 1160 int err; 1161 1162 #ifdef ZFS_DEBUG 1163 /* 1164 * If there is an old value, it shouldn't change across the 1165 * lockdir (eg, due to bprewrite's xlation). 1166 */ 1167 if (integer_size == 8 && num_integers == 1) 1168 (void) zap_lookup(os, zapobj, name, 8, 1, &oldval); 1169 #endif 1170 1171 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1172 if (err) 1173 return (err); 1174 zn = zap_name_alloc(zap, name, MT_EXACT); 1175 if (zn == NULL) { 1176 zap_unlockdir(zap, FTAG); 1177 return (SET_ERROR(ENOTSUP)); 1178 } 1179 if (!zap->zap_ismicro) { 1180 err = fzap_update(zn, integer_size, num_integers, val, 1181 FTAG, tx); 1182 zap = zn->zn_zap; /* fzap_update() may change zap */ 1183 } else if (integer_size != 8 || num_integers != 1 || 1184 strlen(name) >= MZAP_NAME_LEN) { 1185 dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n", 1186 zapobj, integer_size, num_integers, name); 1187 err = mzap_upgrade(&zn->zn_zap, FTAG, tx, 0); 1188 if (err == 0) { 1189 err = fzap_update(zn, integer_size, num_integers, 1190 val, FTAG, tx); 1191 } 1192 zap = zn->zn_zap; /* fzap_update() may change zap */ 1193 } else { 1194 mze = mze_find(zn); 1195 if (mze != NULL) { 1196 ASSERT3U(MZE_PHYS(zap, mze)->mze_value, ==, oldval); 1197 MZE_PHYS(zap, mze)->mze_value = *intval; 1198 } else { 1199 mzap_addent(zn, *intval); 1200 } 1201 } 1202 ASSERT(zap == zn->zn_zap); 1203 zap_name_free(zn); 1204 if (zap != NULL) /* may be NULL if fzap_upgrade() failed */ 1205 zap_unlockdir(zap, FTAG); 1206 return (err); 1207 } 1208 1209 int 1210 zap_update_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 1211 int key_numints, 1212 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx) 1213 { 1214 zap_t *zap; 1215 zap_name_t *zn; 1216 int err; 1217 1218 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1219 if (err) 1220 return (err); 1221 zn = zap_name_alloc_uint64(zap, key, key_numints); 1222 if (zn == NULL) { 1223 zap_unlockdir(zap, FTAG); 1224 return (SET_ERROR(ENOTSUP)); 1225 } 1226 err = fzap_update(zn, integer_size, num_integers, val, FTAG, tx); 1227 zap = zn->zn_zap; /* fzap_update() may change zap */ 1228 zap_name_free(zn); 1229 if (zap != NULL) /* may be NULL if fzap_upgrade() failed */ 1230 zap_unlockdir(zap, FTAG); 1231 return (err); 1232 } 1233 1234 int 1235 zap_remove(objset_t *os, uint64_t zapobj, const char *name, dmu_tx_t *tx) 1236 { 1237 return (zap_remove_norm(os, zapobj, name, MT_EXACT, tx)); 1238 } 1239 1240 int 1241 zap_remove_norm(objset_t *os, uint64_t zapobj, const char *name, 1242 matchtype_t mt, dmu_tx_t *tx) 1243 { 1244 zap_t *zap; 1245 int err; 1246 mzap_ent_t *mze; 1247 zap_name_t *zn; 1248 1249 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, FTAG, &zap); 1250 if (err) 1251 return (err); 1252 zn = zap_name_alloc(zap, name, mt); 1253 if (zn == NULL) { 1254 zap_unlockdir(zap, FTAG); 1255 return (SET_ERROR(ENOTSUP)); 1256 } 1257 if (!zap->zap_ismicro) { 1258 err = fzap_remove(zn, tx); 1259 } else { 1260 mze = mze_find(zn); 1261 if (mze == NULL) { 1262 err = SET_ERROR(ENOENT); 1263 } else { 1264 zap->zap_m.zap_num_entries--; 1265 bzero(&zap_m_phys(zap)->mz_chunk[mze->mze_chunkid], 1266 sizeof (mzap_ent_phys_t)); 1267 mze_remove(zap, mze); 1268 } 1269 } 1270 zap_name_free(zn); 1271 zap_unlockdir(zap, FTAG); 1272 return (err); 1273 } 1274 1275 int 1276 zap_remove_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 1277 int key_numints, dmu_tx_t *tx) 1278 { 1279 zap_t *zap; 1280 int err; 1281 zap_name_t *zn; 1282 1283 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, FTAG, &zap); 1284 if (err) 1285 return (err); 1286 zn = zap_name_alloc_uint64(zap, key, key_numints); 1287 if (zn == NULL) { 1288 zap_unlockdir(zap, FTAG); 1289 return (SET_ERROR(ENOTSUP)); 1290 } 1291 err = fzap_remove(zn, tx); 1292 zap_name_free(zn); 1293 zap_unlockdir(zap, FTAG); 1294 return (err); 1295 } 1296 1297 /* 1298 * Routines for iterating over the attributes. 1299 */ 1300 1301 void 1302 zap_cursor_init_serialized(zap_cursor_t *zc, objset_t *os, uint64_t zapobj, 1303 uint64_t serialized) 1304 { 1305 zc->zc_objset = os; 1306 zc->zc_zap = NULL; 1307 zc->zc_leaf = NULL; 1308 zc->zc_zapobj = zapobj; 1309 zc->zc_serialized = serialized; 1310 zc->zc_hash = 0; 1311 zc->zc_cd = 0; 1312 } 1313 1314 void 1315 zap_cursor_init(zap_cursor_t *zc, objset_t *os, uint64_t zapobj) 1316 { 1317 zap_cursor_init_serialized(zc, os, zapobj, 0); 1318 } 1319 1320 void 1321 zap_cursor_fini(zap_cursor_t *zc) 1322 { 1323 if (zc->zc_zap) { 1324 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER); 1325 zap_unlockdir(zc->zc_zap, NULL); 1326 zc->zc_zap = NULL; 1327 } 1328 if (zc->zc_leaf) { 1329 rw_enter(&zc->zc_leaf->l_rwlock, RW_READER); 1330 zap_put_leaf(zc->zc_leaf); 1331 zc->zc_leaf = NULL; 1332 } 1333 zc->zc_objset = NULL; 1334 } 1335 1336 uint64_t 1337 zap_cursor_serialize(zap_cursor_t *zc) 1338 { 1339 if (zc->zc_hash == -1ULL) 1340 return (-1ULL); 1341 if (zc->zc_zap == NULL) 1342 return (zc->zc_serialized); 1343 ASSERT((zc->zc_hash & zap_maxcd(zc->zc_zap)) == 0); 1344 ASSERT(zc->zc_cd < zap_maxcd(zc->zc_zap)); 1345 1346 /* 1347 * We want to keep the high 32 bits of the cursor zero if we can, so 1348 * that 32-bit programs can access this. So usually use a small 1349 * (28-bit) hash value so we can fit 4 bits of cd into the low 32-bits 1350 * of the cursor. 1351 * 1352 * [ collision differentiator | zap_hashbits()-bit hash value ] 1353 */ 1354 return ((zc->zc_hash >> (64 - zap_hashbits(zc->zc_zap))) | 1355 ((uint64_t)zc->zc_cd << zap_hashbits(zc->zc_zap))); 1356 } 1357 1358 int 1359 zap_cursor_retrieve(zap_cursor_t *zc, zap_attribute_t *za) 1360 { 1361 int err; 1362 avl_index_t idx; 1363 mzap_ent_t mze_tofind; 1364 mzap_ent_t *mze; 1365 1366 if (zc->zc_hash == -1ULL) 1367 return (SET_ERROR(ENOENT)); 1368 1369 if (zc->zc_zap == NULL) { 1370 int hb; 1371 err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL, 1372 RW_READER, TRUE, FALSE, NULL, &zc->zc_zap); 1373 if (err) 1374 return (err); 1375 1376 /* 1377 * To support zap_cursor_init_serialized, advance, retrieve, 1378 * we must add to the existing zc_cd, which may already 1379 * be 1 due to the zap_cursor_advance. 1380 */ 1381 ASSERT(zc->zc_hash == 0); 1382 hb = zap_hashbits(zc->zc_zap); 1383 zc->zc_hash = zc->zc_serialized << (64 - hb); 1384 zc->zc_cd += zc->zc_serialized >> hb; 1385 if (zc->zc_cd >= zap_maxcd(zc->zc_zap)) /* corrupt serialized */ 1386 zc->zc_cd = 0; 1387 } else { 1388 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER); 1389 } 1390 if (!zc->zc_zap->zap_ismicro) { 1391 err = fzap_cursor_retrieve(zc->zc_zap, zc, za); 1392 } else { 1393 mze_tofind.mze_hash = zc->zc_hash; 1394 mze_tofind.mze_cd = zc->zc_cd; 1395 1396 mze = avl_find(&zc->zc_zap->zap_m.zap_avl, &mze_tofind, &idx); 1397 if (mze == NULL) { 1398 mze = avl_nearest(&zc->zc_zap->zap_m.zap_avl, 1399 idx, AVL_AFTER); 1400 } 1401 if (mze) { 1402 mzap_ent_phys_t *mzep = MZE_PHYS(zc->zc_zap, mze); 1403 ASSERT3U(mze->mze_cd, ==, mzep->mze_cd); 1404 za->za_normalization_conflict = 1405 mzap_normalization_conflict(zc->zc_zap, NULL, mze); 1406 za->za_integer_length = 8; 1407 za->za_num_integers = 1; 1408 za->za_first_integer = mzep->mze_value; 1409 (void) strcpy(za->za_name, mzep->mze_name); 1410 zc->zc_hash = mze->mze_hash; 1411 zc->zc_cd = mze->mze_cd; 1412 err = 0; 1413 } else { 1414 zc->zc_hash = -1ULL; 1415 err = SET_ERROR(ENOENT); 1416 } 1417 } 1418 rw_exit(&zc->zc_zap->zap_rwlock); 1419 return (err); 1420 } 1421 1422 void 1423 zap_cursor_advance(zap_cursor_t *zc) 1424 { 1425 if (zc->zc_hash == -1ULL) 1426 return; 1427 zc->zc_cd++; 1428 } 1429 1430 int 1431 zap_cursor_move_to_key(zap_cursor_t *zc, const char *name, matchtype_t mt) 1432 { 1433 int err = 0; 1434 mzap_ent_t *mze; 1435 zap_name_t *zn; 1436 1437 if (zc->zc_zap == NULL) { 1438 err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL, 1439 RW_READER, TRUE, FALSE, FTAG, &zc->zc_zap); 1440 if (err) 1441 return (err); 1442 } else { 1443 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER); 1444 } 1445 1446 zn = zap_name_alloc(zc->zc_zap, name, mt); 1447 if (zn == NULL) { 1448 rw_exit(&zc->zc_zap->zap_rwlock); 1449 return (SET_ERROR(ENOTSUP)); 1450 } 1451 1452 if (!zc->zc_zap->zap_ismicro) { 1453 err = fzap_cursor_move_to_key(zc, zn); 1454 } else { 1455 mze = mze_find(zn); 1456 if (mze == NULL) { 1457 err = SET_ERROR(ENOENT); 1458 goto out; 1459 } 1460 zc->zc_hash = mze->mze_hash; 1461 zc->zc_cd = mze->mze_cd; 1462 } 1463 1464 out: 1465 zap_name_free(zn); 1466 rw_exit(&zc->zc_zap->zap_rwlock); 1467 return (err); 1468 } 1469 1470 int 1471 zap_get_stats(objset_t *os, uint64_t zapobj, zap_stats_t *zs) 1472 { 1473 int err; 1474 zap_t *zap; 1475 1476 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 1477 if (err) 1478 return (err); 1479 1480 bzero(zs, sizeof (zap_stats_t)); 1481 1482 if (zap->zap_ismicro) { 1483 zs->zs_blocksize = zap->zap_dbuf->db_size; 1484 zs->zs_num_entries = zap->zap_m.zap_num_entries; 1485 zs->zs_num_blocks = 1; 1486 } else { 1487 fzap_get_stats(zap, zs); 1488 } 1489 zap_unlockdir(zap, FTAG); 1490 return (0); 1491 } 1492 1493 int 1494 zap_count_write_by_dnode(dnode_t *dn, const char *name, int add, 1495 refcount_t *towrite, refcount_t *tooverwrite) 1496 { 1497 zap_t *zap; 1498 int err = 0; 1499 1500 /* 1501 * Since, we don't have a name, we cannot figure out which blocks will 1502 * be affected in this operation. So, account for the worst case : 1503 * - 3 blocks overwritten: target leaf, ptrtbl block, header block 1504 * - 4 new blocks written if adding: 1505 * - 2 blocks for possibly split leaves, 1506 * - 2 grown ptrtbl blocks 1507 * 1508 * This also accommodates the case where an add operation to a fairly 1509 * large microzap results in a promotion to fatzap. 1510 */ 1511 if (name == NULL) { 1512 (void) refcount_add_many(towrite, 1513 (3 + (add ? 4 : 0)) * SPA_OLD_MAXBLOCKSIZE, FTAG); 1514 return (err); 1515 } 1516 1517 /* 1518 * We lock the zap with adding == FALSE. Because, if we pass 1519 * the actual value of add, it could trigger a mzap_upgrade(). 1520 * At present we are just evaluating the possibility of this operation 1521 * and hence we do not want to trigger an upgrade. 1522 */ 1523 err = zap_lockdir_by_dnode(dn, NULL, RW_READER, TRUE, FALSE, 1524 FTAG, &zap); 1525 if (err != 0) 1526 return (err); 1527 1528 if (!zap->zap_ismicro) { 1529 zap_name_t *zn = zap_name_alloc(zap, name, MT_EXACT); 1530 if (zn) { 1531 err = fzap_count_write(zn, add, towrite, 1532 tooverwrite); 1533 zap_name_free(zn); 1534 } else { 1535 /* 1536 * We treat this case as similar to (name == NULL) 1537 */ 1538 (void) refcount_add_many(towrite, 1539 (3 + (add ? 4 : 0)) * SPA_OLD_MAXBLOCKSIZE, FTAG); 1540 } 1541 } else { 1542 /* 1543 * We are here if (name != NULL) and this is a micro-zap. 1544 * We account for the header block depending on whether it 1545 * is freeable. 1546 * 1547 * Incase of an add-operation it is hard to find out 1548 * if this add will promote this microzap to fatzap. 1549 * Hence, we consider the worst case and account for the 1550 * blocks assuming this microzap would be promoted to a 1551 * fatzap. 1552 * 1553 * 1 block overwritten : header block 1554 * 4 new blocks written : 2 new split leaf, 2 grown 1555 * ptrtbl blocks 1556 */ 1557 if (dmu_buf_freeable(zap->zap_dbuf)) { 1558 (void) refcount_add_many(tooverwrite, 1559 MZAP_MAX_BLKSZ, FTAG); 1560 } else { 1561 (void) refcount_add_many(towrite, 1562 MZAP_MAX_BLKSZ, FTAG); 1563 } 1564 1565 if (add) { 1566 (void) refcount_add_many(towrite, 1567 4 * MZAP_MAX_BLKSZ, FTAG); 1568 } 1569 } 1570 1571 zap_unlockdir(zap, FTAG); 1572 return (err); 1573 } 1574
Indexes created Tue May 26 00:24:38 UTC 2026