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/* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2011, 2017 by Delphix. All rights reserved. 25 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 26 * Copyright (c) 2014 Integros [integros.com] 27 * Copyright 2017 Nexenta Systems, Inc. 28 */ 29 30#include <sys/zio.h> 31#include <sys/spa.h> 32#include <sys/dmu.h> 33#include <sys/zfs_context.h> 34#include <sys/zap.h> 35#include <sys/refcount.h> 36#include <sys/zap_impl.h> 37#include <sys/zap_leaf.h> 38#include <sys/avl.h> 39#include <sys/arc.h> 40#include <sys/dmu_objset.h> 41 42#ifdef _KERNEL 43#include <sys/sunddi.h> 44#endif 45 46extern inline mzap_phys_t *zap_m_phys(zap_t *zap); 47 48static int mzap_upgrade(zap_t **zapp, 49 void *tag, dmu_tx_t *tx, zap_flags_t flags); 50 51uint64_t 52zap_getflags(zap_t *zap) 53{ 54 if (zap->zap_ismicro) 55 return (0); 56 return (zap_f_phys(zap)->zap_flags); 57} 58 59int 60zap_hashbits(zap_t *zap) 61{ 62 if (zap_getflags(zap) & ZAP_FLAG_HASH64) 63 return (48); 64 else 65 return (28); 66} 67 68uint32_t 69zap_maxcd(zap_t *zap) 70{ 71 if (zap_getflags(zap) & ZAP_FLAG_HASH64) 72 return ((1<<16)-1); 73 else 74 return (-1U); 75} 76 77static uint64_t 78zap_hash(zap_name_t *zn) 79{ 80 zap_t *zap = zn->zn_zap; 81 uint64_t h = 0; 82 83 if (zap_getflags(zap) & ZAP_FLAG_PRE_HASHED_KEY) { 84 ASSERT(zap_getflags(zap) & ZAP_FLAG_UINT64_KEY); 85 h = *(uint64_t *)zn->zn_key_orig; 86 } else { 87 h = zap->zap_salt; 88 ASSERT(h != 0); 89 ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 90 91 if (zap_getflags(zap) & ZAP_FLAG_UINT64_KEY) { 92 const uint64_t *wp = zn->zn_key_norm; 93 94 ASSERT(zn->zn_key_intlen == 8); 95 for (int i = 0; i < zn->zn_key_norm_numints; 96 wp++, i++) { 97 uint64_t word = *wp; 98 99 for (int j = 0; j < zn->zn_key_intlen; j++) { 100 h = (h >> 8) ^ 101 zfs_crc64_table[(h ^ word) & 0xFF]; 102 word >>= NBBY; 103 } 104 } 105 } else { 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 int len = zn->zn_key_norm_numints - 1; 116 117 ASSERT(zn->zn_key_intlen == 1); 118 for (int 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 135static int 136zap_normalize(zap_t *zap, const char *name, char *namenorm, int normflags) 137{ 138 ASSERT(!(zap_getflags(zap) & ZAP_FLAG_UINT64_KEY)); 139 140 size_t inlen = strlen(name) + 1; 141 size_t outlen = ZAP_MAXNAMELEN; 142 143 int err = 0; 144 (void) u8_textprep_str((char *)name, &inlen, namenorm, &outlen, 145 normflags | U8_TEXTPREP_IGNORE_NULL | U8_TEXTPREP_IGNORE_INVALID, 146 U8_UNICODE_LATEST, &err); 147 148 return (err); 149} 150 151boolean_t 152zap_match(zap_name_t *zn, const char *matchname) 153{ 154 ASSERT(!(zap_getflags(zn->zn_zap) & ZAP_FLAG_UINT64_KEY)); 155 156 if (zn->zn_matchtype & MT_NORMALIZE) { 157 char norm[ZAP_MAXNAMELEN]; 158 159 if (zap_normalize(zn->zn_zap, matchname, norm, 160 zn->zn_normflags) != 0) 161 return (B_FALSE); 162 163 return (strcmp(zn->zn_key_norm, norm) == 0); 164 } else { 165 return (strcmp(zn->zn_key_orig, matchname) == 0); 166 } 167} 168 169void 170zap_name_free(zap_name_t *zn) 171{ 172 kmem_free(zn, sizeof (zap_name_t)); 173} 174 175zap_name_t * 176zap_name_alloc(zap_t *zap, const char *key, matchtype_t mt) 177{ 178 zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP); 179 180 zn->zn_zap = zap; 181 zn->zn_key_intlen = sizeof (*key); 182 zn->zn_key_orig = key; 183 zn->zn_key_orig_numints = strlen(zn->zn_key_orig) + 1; 184 zn->zn_matchtype = mt; 185 zn->zn_normflags = zap->zap_normflags; 186 187 /* 188 * If we're dealing with a case sensitive lookup on a mixed or 189 * insensitive fs, remove U8_TEXTPREP_TOUPPER or the lookup 190 * will fold case to all caps overriding the lookup request. 191 */ 192 if (mt & MT_MATCH_CASE) 193 zn->zn_normflags &= ~U8_TEXTPREP_TOUPPER; 194 195 if (zap->zap_normflags) { 196 /* 197 * We *must* use zap_normflags because this normalization is 198 * what the hash is computed from. 199 */ 200 if (zap_normalize(zap, key, zn->zn_normbuf, 201 zap->zap_normflags) != 0) { 202 zap_name_free(zn); 203 return (NULL); 204 } 205 zn->zn_key_norm = zn->zn_normbuf; 206 zn->zn_key_norm_numints = strlen(zn->zn_key_norm) + 1; 207 } else { 208 if (mt != 0) { 209 zap_name_free(zn); 210 return (NULL); 211 } 212 zn->zn_key_norm = zn->zn_key_orig; 213 zn->zn_key_norm_numints = zn->zn_key_orig_numints; 214 } 215 216 zn->zn_hash = zap_hash(zn); 217 218 if (zap->zap_normflags != zn->zn_normflags) { 219 /* 220 * We *must* use zn_normflags because this normalization is 221 * what the matching is based on. (Not the hash!) 222 */ 223 if (zap_normalize(zap, key, zn->zn_normbuf, 224 zn->zn_normflags) != 0) { 225 zap_name_free(zn); 226 return (NULL); 227 } 228 zn->zn_key_norm_numints = strlen(zn->zn_key_norm) + 1; 229 } 230 231 return (zn); 232} 233 234zap_name_t * 235zap_name_alloc_uint64(zap_t *zap, const uint64_t *key, int numints) 236{ 237 zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP); 238 239 ASSERT(zap->zap_normflags == 0); 240 zn->zn_zap = zap; 241 zn->zn_key_intlen = sizeof (*key); 242 zn->zn_key_orig = zn->zn_key_norm = key; 243 zn->zn_key_orig_numints = zn->zn_key_norm_numints = numints; 244 zn->zn_matchtype = 0; 245 246 zn->zn_hash = zap_hash(zn); 247 return (zn); 248} 249 250static void 251mzap_byteswap(mzap_phys_t *buf, size_t size) 252{ 253 buf->mz_block_type = BSWAP_64(buf->mz_block_type); 254 buf->mz_salt = BSWAP_64(buf->mz_salt); 255 buf->mz_normflags = BSWAP_64(buf->mz_normflags); 256 int max = (size / MZAP_ENT_LEN) - 1; 257 for (int i = 0; i < max; i++) { 258 buf->mz_chunk[i].mze_value = 259 BSWAP_64(buf->mz_chunk[i].mze_value); 260 buf->mz_chunk[i].mze_cd = 261 BSWAP_32(buf->mz_chunk[i].mze_cd); 262 } 263} 264 265void 266zap_byteswap(void *buf, size_t size) 267{ 268 uint64_t block_type = *(uint64_t *)buf; 269 270 if (block_type == ZBT_MICRO || block_type == BSWAP_64(ZBT_MICRO)) { 271 /* ASSERT(magic == ZAP_LEAF_MAGIC); */ 272 mzap_byteswap(buf, size); 273 } else { 274 fzap_byteswap(buf, size); 275 } 276} 277 278static int 279mze_compare(const void *arg1, const void *arg2) 280{ 281 const mzap_ent_t *mze1 = arg1; 282 const mzap_ent_t *mze2 = arg2; 283 284 int cmp = AVL_CMP(mze1->mze_hash, mze2->mze_hash); 285 if (likely(cmp)) 286 return (cmp); 287 288 return (AVL_CMP(mze1->mze_cd, mze2->mze_cd)); 289} 290 291static int 292mze_insert(zap_t *zap, int chunkid, uint64_t hash) 293{ 294 avl_index_t idx; 295 296 ASSERT(zap->zap_ismicro); 297 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 298 299 mzap_ent_t *mze = kmem_alloc(sizeof (mzap_ent_t), KM_SLEEP); 300 mze->mze_chunkid = chunkid; 301 mze->mze_hash = hash; 302 mze->mze_cd = MZE_PHYS(zap, mze)->mze_cd; 303 ASSERT(MZE_PHYS(zap, mze)->mze_name[0] != 0); 304 if (avl_find(&zap->zap_m.zap_avl, mze, &idx) != NULL) { 305 kmem_free(mze, sizeof (mzap_ent_t)); 306 return (EEXIST); 307 } 308 avl_insert(&zap->zap_m.zap_avl, mze, idx); 309 return (0); 310} 311 312static mzap_ent_t * 313mze_find(zap_name_t *zn) 314{ 315 mzap_ent_t mze_tofind; 316 mzap_ent_t *mze; 317 avl_index_t idx; 318 avl_tree_t *avl = &zn->zn_zap->zap_m.zap_avl; 319 320 ASSERT(zn->zn_zap->zap_ismicro); 321 ASSERT(RW_LOCK_HELD(&zn->zn_zap->zap_rwlock)); 322 323 mze_tofind.mze_hash = zn->zn_hash; 324 mze_tofind.mze_cd = 0; 325 326 mze = avl_find(avl, &mze_tofind, &idx); 327 if (mze == NULL) 328 mze = avl_nearest(avl, idx, AVL_AFTER); 329 for (; mze && mze->mze_hash == zn->zn_hash; mze = AVL_NEXT(avl, mze)) { 330 ASSERT3U(mze->mze_cd, ==, MZE_PHYS(zn->zn_zap, mze)->mze_cd); 331 if (zap_match(zn, MZE_PHYS(zn->zn_zap, mze)->mze_name)) 332 return (mze); 333 } 334 335 return (NULL); 336} 337 338static uint32_t 339mze_find_unused_cd(zap_t *zap, uint64_t hash) 340{ 341 mzap_ent_t mze_tofind; 342 avl_index_t idx; 343 avl_tree_t *avl = &zap->zap_m.zap_avl; 344 345 ASSERT(zap->zap_ismicro); 346 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); 347 348 mze_tofind.mze_hash = hash; 349 mze_tofind.mze_cd = 0; 350 351 uint32_t cd = 0; 352 for (mzap_ent_t *mze = avl_find(avl, &mze_tofind, &idx); 353 mze && mze->mze_hash == hash; mze = AVL_NEXT(avl, mze)) { 354 if (mze->mze_cd != cd) 355 break; 356 cd++; 357 } 358 359 return (cd); 360} 361 362static void 363mze_remove(zap_t *zap, mzap_ent_t *mze) 364{ 365 ASSERT(zap->zap_ismicro); 366 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 367 368 avl_remove(&zap->zap_m.zap_avl, mze); 369 kmem_free(mze, sizeof (mzap_ent_t)); 370} 371 372static void 373mze_destroy(zap_t *zap) 374{ 375 mzap_ent_t *mze; 376 void *avlcookie = NULL; 377 378 while (mze = avl_destroy_nodes(&zap->zap_m.zap_avl, &avlcookie)) 379 kmem_free(mze, sizeof (mzap_ent_t)); 380 avl_destroy(&zap->zap_m.zap_avl); 381} 382 383static zap_t * 384mzap_open(objset_t *os, uint64_t obj, dmu_buf_t *db) 385{ 386 zap_t *winner; 387 uint64_t *zap_hdr = (uint64_t *)db->db_data; 388 uint64_t zap_block_type = zap_hdr[0]; 389 uint64_t zap_magic = zap_hdr[1]; 390 391 ASSERT3U(MZAP_ENT_LEN, ==, sizeof (mzap_ent_phys_t)); 392 393 zap_t *zap = kmem_zalloc(sizeof (zap_t), KM_SLEEP); 394 rw_init(&zap->zap_rwlock, 0, 0, 0); 395 rw_enter(&zap->zap_rwlock, RW_WRITER); 396 zap->zap_objset = os; 397 zap->zap_object = obj; 398 zap->zap_dbuf = db; 399 400 if (zap_block_type != ZBT_MICRO) { 401 mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, 0, 0); 402 zap->zap_f.zap_block_shift = highbit64(db->db_size) - 1; 403 if (zap_block_type != ZBT_HEADER || zap_magic != ZAP_MAGIC) { 404 winner = NULL; /* No actual winner here... */ 405 goto handle_winner; 406 } 407 } else { 408 zap->zap_ismicro = TRUE; 409 } 410 411 /* 412 * Make sure that zap_ismicro is set before we let others see 413 * it, because zap_lockdir() checks zap_ismicro without the lock 414 * held. 415 */ 416 dmu_buf_init_user(&zap->zap_dbu, zap_evict_sync, NULL, &zap->zap_dbuf); 417 winner = dmu_buf_set_user(db, &zap->zap_dbu); 418 419 if (winner != NULL) 420 goto handle_winner; 421 422 if (zap->zap_ismicro) { 423 zap->zap_salt = zap_m_phys(zap)->mz_salt; 424 zap->zap_normflags = zap_m_phys(zap)->mz_normflags; 425 zap->zap_m.zap_num_chunks = db->db_size / MZAP_ENT_LEN - 1; 426 avl_create(&zap->zap_m.zap_avl, mze_compare, 427 sizeof (mzap_ent_t), offsetof(mzap_ent_t, mze_node)); 428 429 for (int i = 0; i < zap->zap_m.zap_num_chunks; i++) { 430 mzap_ent_phys_t *mze = 431 &zap_m_phys(zap)->mz_chunk[i]; 432 if (mze->mze_name[0]) { 433 zap_name_t *zn; 434 435 zn = zap_name_alloc(zap, mze->mze_name, 0); 436 if (mze_insert(zap, i, zn->zn_hash) == 0) 437 zap->zap_m.zap_num_entries++; 438 else { 439 printf("ZFS WARNING: Duplicated ZAP " 440 "entry detected (%s).\n", 441 mze->mze_name); 442 } 443 zap_name_free(zn); 444 } 445 } 446 } else { 447 zap->zap_salt = zap_f_phys(zap)->zap_salt; 448 zap->zap_normflags = zap_f_phys(zap)->zap_normflags; 449 450 ASSERT3U(sizeof (struct zap_leaf_header), ==, 451 2*ZAP_LEAF_CHUNKSIZE); 452 453 /* 454 * The embedded pointer table should not overlap the 455 * other members. 456 */ 457 ASSERT3P(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), >, 458 &zap_f_phys(zap)->zap_salt); 459 460 /* 461 * The embedded pointer table should end at the end of 462 * the block 463 */ 464 ASSERT3U((uintptr_t)&ZAP_EMBEDDED_PTRTBL_ENT(zap, 465 1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)) - 466 (uintptr_t)zap_f_phys(zap), ==, 467 zap->zap_dbuf->db_size); 468 } 469 rw_exit(&zap->zap_rwlock); 470 return (zap); 471 472handle_winner: 473 rw_exit(&zap->zap_rwlock); 474 rw_destroy(&zap->zap_rwlock); 475 if (!zap->zap_ismicro) 476 mutex_destroy(&zap->zap_f.zap_num_entries_mtx); 477 kmem_free(zap, sizeof (zap_t)); 478 return (winner); 479} 480 481/* 482 * This routine "consumes" the caller's hold on the dbuf, which must 483 * have the specified tag. 484 */ 485static int 486zap_lockdir_impl(dmu_buf_t *db, void *tag, dmu_tx_t *tx, 487 krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp) 488{ 489 ASSERT0(db->db_offset); 490 objset_t *os = dmu_buf_get_objset(db); 491 uint64_t obj = db->db_object; 492 493 *zapp = NULL; 494 495 zap_t *zap = dmu_buf_get_user(db); 496 if (zap == NULL) { 497 zap = mzap_open(os, obj, db); 498 if (zap == NULL) { 499 /* 500 * mzap_open() didn't like what it saw on-disk. 501 * Check for corruption! 502 */ 503 return (SET_ERROR(EIO)); 504 } 505 } 506 507 /* 508 * We're checking zap_ismicro without the lock held, in order to 509 * tell what type of lock we want. Once we have some sort of 510 * lock, see if it really is the right type. In practice this 511 * can only be different if it was upgraded from micro to fat, 512 * and micro wanted WRITER but fat only needs READER. 513 */ 514 krw_t lt = (!zap->zap_ismicro && fatreader) ? RW_READER : lti; 515 rw_enter(&zap->zap_rwlock, lt); 516 if (lt != ((!zap->zap_ismicro && fatreader) ? RW_READER : lti)) { 517 /* it was upgraded, now we only need reader */ 518 ASSERT(lt == RW_WRITER); 519 ASSERT(RW_READER == 520 (!zap->zap_ismicro && fatreader) ? RW_READER : lti); 521 rw_downgrade(&zap->zap_rwlock); 522 lt = RW_READER; 523 } 524 525 zap->zap_objset = os; 526 527 if (lt == RW_WRITER) 528 dmu_buf_will_dirty(db, tx); 529 530 ASSERT3P(zap->zap_dbuf, ==, db); 531 532 ASSERT(!zap->zap_ismicro || 533 zap->zap_m.zap_num_entries <= zap->zap_m.zap_num_chunks); 534 if (zap->zap_ismicro && tx && adding && 535 zap->zap_m.zap_num_entries == zap->zap_m.zap_num_chunks) { 536 uint64_t newsz = db->db_size + SPA_MINBLOCKSIZE; 537 if (newsz > MZAP_MAX_BLKSZ) { 538 dprintf("upgrading obj %llu: num_entries=%u\n", 539 obj, zap->zap_m.zap_num_entries); 540 *zapp = zap; 541 int err = mzap_upgrade(zapp, tag, tx, 0); 542 if (err != 0) 543 rw_exit(&zap->zap_rwlock); 544 return (err); 545 } 546 VERIFY0(dmu_object_set_blocksize(os, obj, newsz, 0, tx)); 547 zap->zap_m.zap_num_chunks = 548 db->db_size / MZAP_ENT_LEN - 1; 549 } 550 551 *zapp = zap; 552 return (0); 553} 554 555static int 556zap_lockdir_by_dnode(dnode_t *dn, dmu_tx_t *tx, 557 krw_t lti, boolean_t fatreader, boolean_t adding, void *tag, zap_t **zapp) 558{ 559 dmu_buf_t *db; 560 561 int err = dmu_buf_hold_by_dnode(dn, 0, tag, &db, DMU_READ_NO_PREFETCH); 562 if (err != 0) { 563 return (err); 564 } 565#ifdef ZFS_DEBUG 566 { 567 dmu_object_info_t doi; 568 dmu_object_info_from_db(db, &doi); 569 ASSERT3U(DMU_OT_BYTESWAP(doi.doi_type), ==, DMU_BSWAP_ZAP); 570 } 571#endif 572 573 err = zap_lockdir_impl(db, tag, tx, lti, fatreader, adding, zapp); 574 if (err != 0) { 575 dmu_buf_rele(db, tag); 576 } 577 return (err); 578} 579 580int 581zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx, 582 krw_t lti, boolean_t fatreader, boolean_t adding, void *tag, zap_t **zapp) 583{ 584 dmu_buf_t *db; 585 586 int err = dmu_buf_hold(os, obj, 0, tag, &db, DMU_READ_NO_PREFETCH); 587 if (err != 0) 588 return (err); 589#ifdef ZFS_DEBUG 590 { 591 dmu_object_info_t doi; 592 dmu_object_info_from_db(db, &doi); 593 ASSERT3U(DMU_OT_BYTESWAP(doi.doi_type), ==, DMU_BSWAP_ZAP); 594 } 595#endif 596 err = zap_lockdir_impl(db, tag, tx, lti, fatreader, adding, zapp); 597 if (err != 0) 598 dmu_buf_rele(db, tag); 599 return (err); 600} 601 602void 603zap_unlockdir(zap_t *zap, void *tag) 604{ 605 rw_exit(&zap->zap_rwlock); 606 dmu_buf_rele(zap->zap_dbuf, tag); 607} 608 609static int 610mzap_upgrade(zap_t **zapp, void *tag, dmu_tx_t *tx, zap_flags_t flags) 611{ 612 int err = 0; 613 zap_t *zap = *zapp; 614 615 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 616 617 int sz = zap->zap_dbuf->db_size; 618 mzap_phys_t *mzp = zio_buf_alloc(sz); 619 bcopy(zap->zap_dbuf->db_data, mzp, sz); 620 int nchunks = zap->zap_m.zap_num_chunks; 621 622 if (!flags) { 623 err = dmu_object_set_blocksize(zap->zap_objset, zap->zap_object, 624 1ULL << fzap_default_block_shift, 0, tx); 625 if (err != 0) { 626 zio_buf_free(mzp, sz); 627 return (err); 628 } 629 } 630 631 dprintf("upgrading obj=%llu with %u chunks\n", 632 zap->zap_object, nchunks); 633 /* XXX destroy the avl later, so we can use the stored hash value */ 634 mze_destroy(zap); 635 636 fzap_upgrade(zap, tx, flags); 637 638 for (int i = 0; i < nchunks; i++) { 639 mzap_ent_phys_t *mze = &mzp->mz_chunk[i]; 640 if (mze->mze_name[0] == 0) 641 continue; 642 dprintf("adding %s=%llu\n", 643 mze->mze_name, mze->mze_value); 644 zap_name_t *zn = zap_name_alloc(zap, mze->mze_name, 0); 645 err = fzap_add_cd(zn, 8, 1, &mze->mze_value, mze->mze_cd, 646 tag, tx); 647 zap = zn->zn_zap; /* fzap_add_cd() may change zap */ 648 zap_name_free(zn); 649 if (err != 0) 650 break; 651 } 652 zio_buf_free(mzp, sz); 653 *zapp = zap; 654 return (err); 655} 656 657/* 658 * The "normflags" determine the behavior of the matchtype_t which is 659 * passed to zap_lookup_norm(). Names which have the same normalized 660 * version will be stored with the same hash value, and therefore we can 661 * perform normalization-insensitive lookups. We can be Unicode form- 662 * insensitive and/or case-insensitive. The following flags are valid for 663 * "normflags": 664 * 665 * U8_TEXTPREP_NFC 666 * U8_TEXTPREP_NFD 667 * U8_TEXTPREP_NFKC 668 * U8_TEXTPREP_NFKD 669 * U8_TEXTPREP_TOUPPER 670 * 671 * The *_NF* (Normalization Form) flags are mutually exclusive; at most one 672 * of them may be supplied. 673 */ 674void 675mzap_create_impl(objset_t *os, uint64_t obj, int normflags, zap_flags_t flags, 676 dmu_tx_t *tx) 677{ 678 dmu_buf_t *db; 679 680 VERIFY0(dmu_buf_hold(os, obj, 0, FTAG, &db, DMU_READ_NO_PREFETCH)); 681 682 dmu_buf_will_dirty(db, tx); 683 mzap_phys_t *zp = db->db_data; 684 zp->mz_block_type = ZBT_MICRO; 685 zp->mz_salt = ((uintptr_t)db ^ (uintptr_t)tx ^ (obj << 1)) | 1ULL; 686 zp->mz_normflags = normflags; 687 688 if (flags != 0) { 689 zap_t *zap; 690 /* Only fat zap supports flags; upgrade immediately. */ 691 VERIFY0(zap_lockdir_impl(db, FTAG, tx, RW_WRITER, 692 B_FALSE, B_FALSE, &zap)); 693 VERIFY0(mzap_upgrade(&zap, FTAG, tx, flags)); 694 zap_unlockdir(zap, FTAG); 695 } else { 696 dmu_buf_rele(db, FTAG); 697 } 698} 699 700int 701zap_create_claim(objset_t *os, uint64_t obj, dmu_object_type_t ot, 702 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 703{ 704 return (zap_create_claim_norm(os, obj, 705 0, ot, bonustype, bonuslen, tx)); 706} 707 708int 709zap_create_claim_norm(objset_t *os, uint64_t obj, int normflags, 710 dmu_object_type_t ot, 711 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 712{ 713 ASSERT3U(DMU_OT_BYTESWAP(ot), ==, DMU_BSWAP_ZAP); 714 int err = dmu_object_claim(os, obj, ot, 0, bonustype, bonuslen, tx); 715 if (err != 0) 716 return (err); 717 mzap_create_impl(os, obj, normflags, 0, tx); 718 return (0); 719} 720 721uint64_t 722zap_create(objset_t *os, dmu_object_type_t ot, 723 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 724{ 725 return (zap_create_norm(os, 0, ot, bonustype, bonuslen, tx)); 726} 727 728uint64_t 729zap_create_norm(objset_t *os, int normflags, dmu_object_type_t ot, 730 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 731{ 732 ASSERT3U(DMU_OT_BYTESWAP(ot), ==, DMU_BSWAP_ZAP); 733 uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx); 734 735 mzap_create_impl(os, obj, normflags, 0, tx); 736 return (obj); 737} 738 739uint64_t 740zap_create_flags(objset_t *os, int normflags, zap_flags_t flags, 741 dmu_object_type_t ot, int leaf_blockshift, int indirect_blockshift, 742 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 743{ 744 ASSERT3U(DMU_OT_BYTESWAP(ot), ==, DMU_BSWAP_ZAP); 745 uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx); 746 747 ASSERT(leaf_blockshift >= SPA_MINBLOCKSHIFT && 748 leaf_blockshift <= SPA_OLD_MAXBLOCKSHIFT && 749 indirect_blockshift >= SPA_MINBLOCKSHIFT && 750 indirect_blockshift <= SPA_OLD_MAXBLOCKSHIFT); 751 752 VERIFY(dmu_object_set_blocksize(os, obj, 753 1ULL << leaf_blockshift, indirect_blockshift, tx) == 0); 754 755 mzap_create_impl(os, obj, normflags, flags, tx); 756 return (obj); 757} 758 759int 760zap_destroy(objset_t *os, uint64_t zapobj, dmu_tx_t *tx) 761{ 762 /* 763 * dmu_object_free will free the object number and free the 764 * data. Freeing the data will cause our pageout function to be 765 * called, which will destroy our data (zap_leaf_t's and zap_t). 766 */ 767 768 return (dmu_object_free(os, zapobj, tx)); 769} 770 771void 772zap_evict_sync(void *dbu) 773{ 774 zap_t *zap = dbu; 775 776 rw_destroy(&zap->zap_rwlock); 777 778 if (zap->zap_ismicro) 779 mze_destroy(zap); 780 else 781 mutex_destroy(&zap->zap_f.zap_num_entries_mtx); 782 783 kmem_free(zap, sizeof (zap_t)); 784} 785 786int 787zap_count(objset_t *os, uint64_t zapobj, uint64_t *count) 788{ 789 zap_t *zap; 790 791 int err = 792 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 793 if (err != 0) 794 return (err); 795 if (!zap->zap_ismicro) { 796 err = fzap_count(zap, count); 797 } else { 798 *count = zap->zap_m.zap_num_entries; 799 } 800 zap_unlockdir(zap, FTAG); 801 return (err); 802} 803 804/* 805 * zn may be NULL; if not specified, it will be computed if needed. 806 * See also the comment above zap_entry_normalization_conflict(). 807 */ 808static boolean_t 809mzap_normalization_conflict(zap_t *zap, zap_name_t *zn, mzap_ent_t *mze) 810{ 811 int direction = AVL_BEFORE; 812 boolean_t allocdzn = B_FALSE; 813 814 if (zap->zap_normflags == 0) 815 return (B_FALSE); 816 817again: 818 for (mzap_ent_t *other = avl_walk(&zap->zap_m.zap_avl, mze, direction); 819 other && other->mze_hash == mze->mze_hash; 820 other = avl_walk(&zap->zap_m.zap_avl, other, direction)) { 821 822 if (zn == NULL) { 823 zn = zap_name_alloc(zap, MZE_PHYS(zap, mze)->mze_name, 824 MT_NORMALIZE); 825 allocdzn = B_TRUE; 826 } 827 if (zap_match(zn, MZE_PHYS(zap, other)->mze_name)) { 828 if (allocdzn) 829 zap_name_free(zn); 830 return (B_TRUE); 831 } 832 } 833 834 if (direction == AVL_BEFORE) { 835 direction = AVL_AFTER; 836 goto again; 837 } 838 839 if (allocdzn) 840 zap_name_free(zn); 841 return (B_FALSE); 842} 843 844/* 845 * Routines for manipulating attributes. 846 */ 847 848int 849zap_lookup(objset_t *os, uint64_t zapobj, const char *name, 850 uint64_t integer_size, uint64_t num_integers, void *buf) 851{ 852 return (zap_lookup_norm(os, zapobj, name, integer_size, 853 num_integers, buf, 0, NULL, 0, NULL)); 854} 855 856static int 857zap_lookup_impl(zap_t *zap, const char *name, 858 uint64_t integer_size, uint64_t num_integers, void *buf, 859 matchtype_t mt, char *realname, int rn_len, 860 boolean_t *ncp) 861{ 862 int err = 0; 863 864 zap_name_t *zn = zap_name_alloc(zap, name, mt); 865 if (zn == NULL) 866 return (SET_ERROR(ENOTSUP)); 867 868 if (!zap->zap_ismicro) { 869 err = fzap_lookup(zn, integer_size, num_integers, buf, 870 realname, rn_len, ncp); 871 } else { 872 mzap_ent_t *mze = mze_find(zn); 873 if (mze == NULL) { 874 err = SET_ERROR(ENOENT); 875 } else { 876 if (num_integers < 1) { 877 err = SET_ERROR(EOVERFLOW); 878 } else if (integer_size != 8) { 879 err = SET_ERROR(EINVAL); 880 } else { 881 *(uint64_t *)buf = 882 MZE_PHYS(zap, mze)->mze_value; 883 (void) strlcpy(realname, 884 MZE_PHYS(zap, mze)->mze_name, rn_len); 885 if (ncp) { 886 *ncp = mzap_normalization_conflict(zap, 887 zn, mze); 888 } 889 } 890 } 891 } 892 zap_name_free(zn); 893 return (err); 894} 895 896int 897zap_lookup_norm(objset_t *os, uint64_t zapobj, const char *name, 898 uint64_t integer_size, uint64_t num_integers, void *buf, 899 matchtype_t mt, char *realname, int rn_len, 900 boolean_t *ncp) 901{ 902 zap_t *zap; 903 904 int err = 905 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 906 if (err != 0) 907 return (err); 908 err = zap_lookup_impl(zap, name, integer_size, 909 num_integers, buf, mt, realname, rn_len, ncp); 910 zap_unlockdir(zap, FTAG); 911 return (err); 912} 913 914int 915zap_lookup_by_dnode(dnode_t *dn, const char *name, 916 uint64_t integer_size, uint64_t num_integers, void *buf) 917{ 918 return (zap_lookup_norm_by_dnode(dn, name, integer_size, 919 num_integers, buf, 0, NULL, 0, NULL)); 920} 921 922int 923zap_lookup_norm_by_dnode(dnode_t *dn, const char *name, 924 uint64_t integer_size, uint64_t num_integers, void *buf, 925 matchtype_t mt, char *realname, int rn_len, 926 boolean_t *ncp) 927{ 928 zap_t *zap; 929 930 int err = zap_lockdir_by_dnode(dn, NULL, RW_READER, TRUE, FALSE, 931 FTAG, &zap); 932 if (err != 0) 933 return (err); 934 err = zap_lookup_impl(zap, name, integer_size, 935 num_integers, buf, mt, realname, rn_len, ncp); 936 zap_unlockdir(zap, FTAG); 937 return (err); 938} 939 940int 941zap_prefetch_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 942 int key_numints) 943{ 944 zap_t *zap; 945 946 int err = 947 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 948 if (err != 0) 949 return (err); 950 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints); 951 if (zn == NULL) { 952 zap_unlockdir(zap, FTAG); 953 return (SET_ERROR(ENOTSUP)); 954 } 955 956 fzap_prefetch(zn); 957 zap_name_free(zn); 958 zap_unlockdir(zap, FTAG); 959 return (err); 960} 961 962int 963zap_lookup_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 964 int key_numints, uint64_t integer_size, uint64_t num_integers, void *buf) 965{ 966 zap_t *zap; 967 968 int err = 969 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 970 if (err != 0) 971 return (err); 972 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints); 973 if (zn == NULL) { 974 zap_unlockdir(zap, FTAG); 975 return (SET_ERROR(ENOTSUP)); 976 } 977 978 err = fzap_lookup(zn, integer_size, num_integers, buf, 979 NULL, 0, NULL); 980 zap_name_free(zn); 981 zap_unlockdir(zap, FTAG); 982 return (err); 983} 984 985int 986zap_contains(objset_t *os, uint64_t zapobj, const char *name) 987{ 988 int err = zap_lookup_norm(os, zapobj, name, 0, 989 0, NULL, 0, NULL, 0, NULL); 990 if (err == EOVERFLOW || err == EINVAL) 991 err = 0; /* found, but skipped reading the value */ 992 return (err); 993} 994 995int 996zap_length(objset_t *os, uint64_t zapobj, const char *name, 997 uint64_t *integer_size, uint64_t *num_integers) 998{ 999 zap_t *zap; 1000 1001 int err = 1002 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 1003 if (err != 0) 1004 return (err); 1005 zap_name_t *zn = zap_name_alloc(zap, name, 0); 1006 if (zn == NULL) { 1007 zap_unlockdir(zap, FTAG); 1008 return (SET_ERROR(ENOTSUP)); 1009 } 1010 if (!zap->zap_ismicro) { 1011 err = fzap_length(zn, integer_size, num_integers); 1012 } else { 1013 mzap_ent_t *mze = mze_find(zn); 1014 if (mze == NULL) { 1015 err = SET_ERROR(ENOENT); 1016 } else { 1017 if (integer_size) 1018 *integer_size = 8; 1019 if (num_integers) 1020 *num_integers = 1; 1021 } 1022 } 1023 zap_name_free(zn); 1024 zap_unlockdir(zap, FTAG); 1025 return (err); 1026} 1027 1028int 1029zap_length_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 1030 int key_numints, uint64_t *integer_size, uint64_t *num_integers) 1031{ 1032 zap_t *zap; 1033 1034 int err = 1035 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 1036 if (err != 0) 1037 return (err); 1038 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints); 1039 if (zn == NULL) { 1040 zap_unlockdir(zap, FTAG); 1041 return (SET_ERROR(ENOTSUP)); 1042 } 1043 err = fzap_length(zn, integer_size, num_integers); 1044 zap_name_free(zn); 1045 zap_unlockdir(zap, FTAG); 1046 return (err); 1047} 1048 1049static void 1050mzap_addent(zap_name_t *zn, uint64_t value) 1051{ 1052 zap_t *zap = zn->zn_zap; 1053 int start = zap->zap_m.zap_alloc_next; 1054 1055 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 1056 1057#ifdef ZFS_DEBUG 1058 for (int i = 0; i < zap->zap_m.zap_num_chunks; i++) { 1059 mzap_ent_phys_t *mze = &zap_m_phys(zap)->mz_chunk[i]; 1060 ASSERT(strcmp(zn->zn_key_orig, mze->mze_name) != 0); 1061 } 1062#endif 1063 1064 uint32_t cd = mze_find_unused_cd(zap, zn->zn_hash); 1065 /* given the limited size of the microzap, this can't happen */ 1066 ASSERT(cd < zap_maxcd(zap)); 1067 1068again: 1069 for (int i = start; i < zap->zap_m.zap_num_chunks; i++) { 1070 mzap_ent_phys_t *mze = &zap_m_phys(zap)->mz_chunk[i]; 1071 if (mze->mze_name[0] == 0) { 1072 mze->mze_value = value; 1073 mze->mze_cd = cd; 1074 (void) strcpy(mze->mze_name, zn->zn_key_orig); 1075 zap->zap_m.zap_num_entries++; 1076 zap->zap_m.zap_alloc_next = i+1; 1077 if (zap->zap_m.zap_alloc_next == 1078 zap->zap_m.zap_num_chunks) 1079 zap->zap_m.zap_alloc_next = 0; 1080 VERIFY(0 == mze_insert(zap, i, zn->zn_hash)); 1081 return; 1082 } 1083 } 1084 if (start != 0) { 1085 start = 0; 1086 goto again; 1087 } 1088 ASSERT(!"out of entries!"); 1089} 1090 1091static int 1092zap_add_impl(zap_t *zap, const char *key, 1093 int integer_size, uint64_t num_integers, 1094 const void *val, dmu_tx_t *tx, void *tag) 1095{ 1096 const uint64_t *intval = val; 1097 int err = 0; 1098 1099 zap_name_t *zn = zap_name_alloc(zap, key, 0); 1100 if (zn == NULL) { 1101 zap_unlockdir(zap, tag); 1102 return (SET_ERROR(ENOTSUP)); 1103 } 1104 if (!zap->zap_ismicro) { 1105 err = fzap_add(zn, integer_size, num_integers, val, tag, tx); 1106 zap = zn->zn_zap; /* fzap_add() may change zap */ 1107 } else if (integer_size != 8 || num_integers != 1 || 1108 strlen(key) >= MZAP_NAME_LEN) { 1109 err = mzap_upgrade(&zn->zn_zap, tag, tx, 0); 1110 if (err == 0) { 1111 err = fzap_add(zn, integer_size, num_integers, val, 1112 tag, tx); 1113 } 1114 zap = zn->zn_zap; /* fzap_add() may change zap */ 1115 } else { 1116 if (mze_find(zn) != NULL) { 1117 err = SET_ERROR(EEXIST); 1118 } else { 1119 mzap_addent(zn, *intval); 1120 } 1121 } 1122 ASSERT(zap == zn->zn_zap); 1123 zap_name_free(zn); 1124 if (zap != NULL) /* may be NULL if fzap_add() failed */ 1125 zap_unlockdir(zap, tag); 1126 return (err); 1127} 1128 1129int 1130zap_add(objset_t *os, uint64_t zapobj, const char *key, 1131 int integer_size, uint64_t num_integers, 1132 const void *val, dmu_tx_t *tx) 1133{ 1134 zap_t *zap; 1135 int err; 1136 1137 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1138 if (err != 0) 1139 return (err); 1140 err = zap_add_impl(zap, key, integer_size, num_integers, val, tx, FTAG); 1141 /* zap_add_impl() calls zap_unlockdir() */ 1142 return (err); 1143} 1144 1145int 1146zap_add_by_dnode(dnode_t *dn, const char *key, 1147 int integer_size, uint64_t num_integers, 1148 const void *val, dmu_tx_t *tx) 1149{ 1150 zap_t *zap; 1151 int err; 1152 1153 err = zap_lockdir_by_dnode(dn, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1154 if (err != 0) 1155 return (err); 1156 err = zap_add_impl(zap, key, integer_size, num_integers, val, tx, FTAG); 1157 /* zap_add_impl() calls zap_unlockdir() */ 1158 return (err); 1159} 1160 1161int 1162zap_add_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 1163 int key_numints, int integer_size, uint64_t num_integers, 1164 const void *val, dmu_tx_t *tx) 1165{ 1166 zap_t *zap; 1167 1168 int err = 1169 zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1170 if (err != 0) 1171 return (err); 1172 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints); 1173 if (zn == NULL) { 1174 zap_unlockdir(zap, FTAG); 1175 return (SET_ERROR(ENOTSUP)); 1176 } 1177 err = fzap_add(zn, integer_size, num_integers, val, FTAG, tx); 1178 zap = zn->zn_zap; /* fzap_add() may change zap */ 1179 zap_name_free(zn); 1180 if (zap != NULL) /* may be NULL if fzap_add() failed */ 1181 zap_unlockdir(zap, FTAG); 1182 return (err); 1183} 1184 1185int 1186zap_update(objset_t *os, uint64_t zapobj, const char *name, 1187 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx) 1188{ 1189 zap_t *zap; 1190 uint64_t oldval; 1191 const uint64_t *intval = val; 1192 1193#ifdef ZFS_DEBUG 1194 /* 1195 * If there is an old value, it shouldn't change across the 1196 * lockdir (eg, due to bprewrite's xlation). 1197 */ 1198 if (integer_size == 8 && num_integers == 1) 1199 (void) zap_lookup(os, zapobj, name, 8, 1, &oldval); 1200#endif 1201 1202 int err = 1203 zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1204 if (err != 0) 1205 return (err); 1206 zap_name_t *zn = zap_name_alloc(zap, name, 0); 1207 if (zn == NULL) { 1208 zap_unlockdir(zap, FTAG); 1209 return (SET_ERROR(ENOTSUP)); 1210 } 1211 if (!zap->zap_ismicro) { 1212 err = fzap_update(zn, integer_size, num_integers, val, 1213 FTAG, tx); 1214 zap = zn->zn_zap; /* fzap_update() may change zap */ 1215 } else if (integer_size != 8 || num_integers != 1 || 1216 strlen(name) >= MZAP_NAME_LEN) { 1217 dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n", 1218 zapobj, integer_size, num_integers, name); 1219 err = mzap_upgrade(&zn->zn_zap, FTAG, tx, 0); 1220 if (err == 0) { 1221 err = fzap_update(zn, integer_size, num_integers, 1222 val, FTAG, tx); 1223 } 1224 zap = zn->zn_zap; /* fzap_update() may change zap */ 1225 } else { 1226 mzap_ent_t *mze = mze_find(zn); 1227 if (mze != NULL) { 1228 ASSERT3U(MZE_PHYS(zap, mze)->mze_value, ==, oldval); 1229 MZE_PHYS(zap, mze)->mze_value = *intval; 1230 } else { 1231 mzap_addent(zn, *intval); 1232 } 1233 } 1234 ASSERT(zap == zn->zn_zap); 1235 zap_name_free(zn); 1236 if (zap != NULL) /* may be NULL if fzap_upgrade() failed */ 1237 zap_unlockdir(zap, FTAG); 1238 return (err); 1239} 1240 1241int 1242zap_update_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 1243 int key_numints, 1244 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx) 1245{ 1246 zap_t *zap; 1247 1248 int err = 1249 zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1250 if (err != 0) 1251 return (err); 1252 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints); 1253 if (zn == NULL) { 1254 zap_unlockdir(zap, FTAG); 1255 return (SET_ERROR(ENOTSUP)); 1256 } 1257 err = fzap_update(zn, integer_size, num_integers, val, FTAG, tx); 1258 zap = zn->zn_zap; /* fzap_update() may change zap */ 1259 zap_name_free(zn); 1260 if (zap != NULL) /* may be NULL if fzap_upgrade() failed */ 1261 zap_unlockdir(zap, FTAG); 1262 return (err); 1263} 1264 1265int 1266zap_remove(objset_t *os, uint64_t zapobj, const char *name, dmu_tx_t *tx) 1267{ 1268 return (zap_remove_norm(os, zapobj, name, 0, tx)); 1269} 1270 1271static int 1272zap_remove_impl(zap_t *zap, const char *name, 1273 matchtype_t mt, dmu_tx_t *tx) 1274{ 1275 int err = 0; 1276 1277 zap_name_t *zn = zap_name_alloc(zap, name, mt); 1278 if (zn == NULL) 1279 return (SET_ERROR(ENOTSUP)); 1280 if (!zap->zap_ismicro) { 1281 err = fzap_remove(zn, tx); 1282 } else { 1283 mzap_ent_t *mze = mze_find(zn); 1284 if (mze == NULL) { 1285 err = SET_ERROR(ENOENT); 1286 } else { 1287 zap->zap_m.zap_num_entries--; 1288 bzero(&zap_m_phys(zap)->mz_chunk[mze->mze_chunkid], 1289 sizeof (mzap_ent_phys_t)); 1290 mze_remove(zap, mze); 1291 } 1292 } 1293 zap_name_free(zn); 1294 return (err); 1295} 1296 1297int 1298zap_remove_norm(objset_t *os, uint64_t zapobj, const char *name, 1299 matchtype_t mt, dmu_tx_t *tx) 1300{ 1301 zap_t *zap; 1302 int err; 1303 1304 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, FTAG, &zap); 1305 if (err) 1306 return (err); 1307 err = zap_remove_impl(zap, name, mt, tx); 1308 zap_unlockdir(zap, FTAG); 1309 return (err); 1310} 1311 1312int 1313zap_remove_by_dnode(dnode_t *dn, const char *name, dmu_tx_t *tx) 1314{ 1315 zap_t *zap; 1316 int err; 1317 1318 err = zap_lockdir_by_dnode(dn, tx, RW_WRITER, TRUE, FALSE, FTAG, &zap); 1319 if (err) 1320 return (err); 1321 err = zap_remove_impl(zap, name, 0, tx); 1322 zap_unlockdir(zap, FTAG); 1323 return (err); 1324} 1325 1326int 1327zap_remove_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 1328 int key_numints, dmu_tx_t *tx) 1329{ 1330 zap_t *zap; 1331 1332 int err = 1333 zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, FTAG, &zap); 1334 if (err != 0) 1335 return (err); 1336 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints); 1337 if (zn == NULL) { 1338 zap_unlockdir(zap, FTAG); 1339 return (SET_ERROR(ENOTSUP)); 1340 } 1341 err = fzap_remove(zn, tx); 1342 zap_name_free(zn); 1343 zap_unlockdir(zap, FTAG); 1344 return (err); 1345} 1346 1347/* 1348 * Routines for iterating over the attributes. 1349 */ 1350 1351void 1352zap_cursor_init_serialized(zap_cursor_t *zc, objset_t *os, uint64_t zapobj, 1353 uint64_t serialized) 1354{ 1355 zc->zc_objset = os; 1356 zc->zc_zap = NULL; 1357 zc->zc_leaf = NULL; 1358 zc->zc_zapobj = zapobj; 1359 zc->zc_serialized = serialized; 1360 zc->zc_hash = 0; 1361 zc->zc_cd = 0; 1362} 1363 1364void 1365zap_cursor_init(zap_cursor_t *zc, objset_t *os, uint64_t zapobj) 1366{ 1367 zap_cursor_init_serialized(zc, os, zapobj, 0); 1368} 1369 1370void 1371zap_cursor_fini(zap_cursor_t *zc) 1372{ 1373 if (zc->zc_zap) { 1374 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER); 1375 zap_unlockdir(zc->zc_zap, NULL); 1376 zc->zc_zap = NULL; 1377 } 1378 if (zc->zc_leaf) { 1379 rw_enter(&zc->zc_leaf->l_rwlock, RW_READER); 1380 zap_put_leaf(zc->zc_leaf); 1381 zc->zc_leaf = NULL; 1382 } 1383 zc->zc_objset = NULL; 1384} 1385 1386uint64_t 1387zap_cursor_serialize(zap_cursor_t *zc) 1388{ 1389 if (zc->zc_hash == -1ULL) 1390 return (-1ULL); 1391 if (zc->zc_zap == NULL) 1392 return (zc->zc_serialized); 1393 ASSERT((zc->zc_hash & zap_maxcd(zc->zc_zap)) == 0); 1394 ASSERT(zc->zc_cd < zap_maxcd(zc->zc_zap)); 1395 1396 /* 1397 * We want to keep the high 32 bits of the cursor zero if we can, so 1398 * that 32-bit programs can access this. So usually use a small 1399 * (28-bit) hash value so we can fit 4 bits of cd into the low 32-bits 1400 * of the cursor. 1401 * 1402 * [ collision differentiator | zap_hashbits()-bit hash value ] 1403 */ 1404 return ((zc->zc_hash >> (64 - zap_hashbits(zc->zc_zap))) | 1405 ((uint64_t)zc->zc_cd << zap_hashbits(zc->zc_zap))); 1406} 1407 1408int 1409zap_cursor_retrieve(zap_cursor_t *zc, zap_attribute_t *za) 1410{ 1411 int err; 1412 1413 if (zc->zc_hash == -1ULL) 1414 return (SET_ERROR(ENOENT)); 1415 1416 if (zc->zc_zap == NULL) { 1417 int hb; 1418 err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL, 1419 RW_READER, TRUE, FALSE, NULL, &zc->zc_zap); 1420 if (err != 0) 1421 return (err); 1422 1423 /* 1424 * To support zap_cursor_init_serialized, advance, retrieve, 1425 * we must add to the existing zc_cd, which may already 1426 * be 1 due to the zap_cursor_advance. 1427 */ 1428 ASSERT(zc->zc_hash == 0); 1429 hb = zap_hashbits(zc->zc_zap); 1430 zc->zc_hash = zc->zc_serialized << (64 - hb); 1431 zc->zc_cd += zc->zc_serialized >> hb; 1432 if (zc->zc_cd >= zap_maxcd(zc->zc_zap)) /* corrupt serialized */ 1433 zc->zc_cd = 0; 1434 } else { 1435 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER); 1436 } 1437 if (!zc->zc_zap->zap_ismicro) { 1438 err = fzap_cursor_retrieve(zc->zc_zap, zc, za); 1439 } else { 1440 avl_index_t idx; 1441 mzap_ent_t mze_tofind; 1442 1443 mze_tofind.mze_hash = zc->zc_hash; 1444 mze_tofind.mze_cd = zc->zc_cd; 1445 1446 mzap_ent_t *mze = 1447 avl_find(&zc->zc_zap->zap_m.zap_avl, &mze_tofind, &idx); 1448 if (mze == NULL) { 1449 mze = avl_nearest(&zc->zc_zap->zap_m.zap_avl, 1450 idx, AVL_AFTER); 1451 } 1452 if (mze) { 1453 mzap_ent_phys_t *mzep = MZE_PHYS(zc->zc_zap, mze); 1454 ASSERT3U(mze->mze_cd, ==, mzep->mze_cd); 1455 za->za_normalization_conflict = 1456 mzap_normalization_conflict(zc->zc_zap, NULL, mze); 1457 za->za_integer_length = 8; 1458 za->za_num_integers = 1; 1459 za->za_first_integer = mzep->mze_value; 1460 (void) strcpy(za->za_name, mzep->mze_name); 1461 zc->zc_hash = mze->mze_hash; 1462 zc->zc_cd = mze->mze_cd; 1463 err = 0; 1464 } else { 1465 zc->zc_hash = -1ULL; 1466 err = SET_ERROR(ENOENT); 1467 } 1468 } 1469 rw_exit(&zc->zc_zap->zap_rwlock); 1470 return (err); 1471} 1472 1473void 1474zap_cursor_advance(zap_cursor_t *zc) 1475{ 1476 if (zc->zc_hash == -1ULL) 1477 return; 1478 zc->zc_cd++; 1479} 1480 1481int 1482zap_cursor_move_to_key(zap_cursor_t *zc, const char *name, matchtype_t mt) 1483{ 1484 int err = 0; 1485 mzap_ent_t *mze; 1486 zap_name_t *zn; 1487 1488 if (zc->zc_zap == NULL) { 1489 err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL, 1490 RW_READER, TRUE, FALSE, FTAG, &zc->zc_zap); 1491 if (err) 1492 return (err); 1493 } else { 1494 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER); 1495 } 1496 1497 zn = zap_name_alloc(zc->zc_zap, name, mt); 1498 if (zn == NULL) { 1499 rw_exit(&zc->zc_zap->zap_rwlock); 1500 return (SET_ERROR(ENOTSUP)); 1501 } 1502 1503 if (!zc->zc_zap->zap_ismicro) { 1504 err = fzap_cursor_move_to_key(zc, zn); 1505 } else { 1506 mze = mze_find(zn); 1507 if (mze == NULL) { 1508 err = SET_ERROR(ENOENT); 1509 goto out; 1510 } 1511 zc->zc_hash = mze->mze_hash; 1512 zc->zc_cd = mze->mze_cd; 1513 } 1514 1515out: 1516 zap_name_free(zn); 1517 rw_exit(&zc->zc_zap->zap_rwlock); 1518 return (err); 1519} 1520 1521int 1522zap_get_stats(objset_t *os, uint64_t zapobj, zap_stats_t *zs) 1523{ 1524 zap_t *zap; 1525 1526 int err = 1527 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 1528 if (err != 0) 1529 return (err); 1530 1531 bzero(zs, sizeof (zap_stats_t)); 1532 1533 if (zap->zap_ismicro) { 1534 zs->zs_blocksize = zap->zap_dbuf->db_size; 1535 zs->zs_num_entries = zap->zap_m.zap_num_entries; 1536 zs->zs_num_blocks = 1; 1537 } else { 1538 fzap_get_stats(zap, zs); 1539 } 1540 zap_unlockdir(zap, FTAG); 1541 return (0); 1542} 1543