zap_micro.c revision 307287
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 44extern inline mzap_phys_t *zap_m_phys(zap_t *zap); 45 46static int mzap_upgrade(zap_t **zapp, 47 void *tag, dmu_tx_t *tx, zap_flags_t flags); 48 49uint64_t 50zap_getflags(zap_t *zap) 51{ 52 if (zap->zap_ismicro) 53 return (0); 54 return (zap_f_phys(zap)->zap_flags); 55} 56 57int 58zap_hashbits(zap_t *zap) 59{ 60 if (zap_getflags(zap) & ZAP_FLAG_HASH64) 61 return (48); 62 else 63 return (28); 64} 65 66uint32_t 67zap_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 75static uint64_t 76zap_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 135static int 136zap_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 154boolean_t 155zap_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 172void 173zap_name_free(zap_name_t *zn) 174{ 175 kmem_free(zn, sizeof (zap_name_t)); 176} 177 178zap_name_t * 179zap_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 208zap_name_t * 209zap_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 224static void 225mzap_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 240void 241zap_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 255static int 256mze_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 272static int 273mze_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 294static mzap_ent_t * 295mze_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 308again: 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 324static uint32_t 325mze_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 350static void 351mze_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 360static void 361mze_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 371static zap_t * 372mzap_open(objset_t *os, uint64_t obj, dmu_buf_t *db) 373{ 374 zap_t *winner; 375 zap_t *zap; 376 int i; 377 378 ASSERT3U(MZAP_ENT_LEN, ==, sizeof (mzap_ent_phys_t)); 379 380 zap = kmem_zalloc(sizeof (zap_t), KM_SLEEP); 381 rw_init(&zap->zap_rwlock, 0, 0, 0); 382 rw_enter(&zap->zap_rwlock, RW_WRITER); 383 zap->zap_objset = os; 384 zap->zap_object = obj; 385 zap->zap_dbuf = db; 386 387 if (*(uint64_t *)db->db_data != ZBT_MICRO) { 388 mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, 0, 0); 389 zap->zap_f.zap_block_shift = highbit64(db->db_size) - 1; 390 } else { 391 zap->zap_ismicro = TRUE; 392 } 393 394 /* 395 * Make sure that zap_ismicro is set before we let others see 396 * it, because zap_lockdir() checks zap_ismicro without the lock 397 * held. 398 */ 399 dmu_buf_init_user(&zap->zap_dbu, zap_evict, &zap->zap_dbuf); 400 winner = dmu_buf_set_user(db, &zap->zap_dbu); 401 402 if (winner != NULL) { 403 rw_exit(&zap->zap_rwlock); 404 rw_destroy(&zap->zap_rwlock); 405 if (!zap->zap_ismicro) 406 mutex_destroy(&zap->zap_f.zap_num_entries_mtx); 407 kmem_free(zap, sizeof (zap_t)); 408 return (winner); 409 } 410 411 if (zap->zap_ismicro) { 412 zap->zap_salt = zap_m_phys(zap)->mz_salt; 413 zap->zap_normflags = zap_m_phys(zap)->mz_normflags; 414 zap->zap_m.zap_num_chunks = db->db_size / MZAP_ENT_LEN - 1; 415 avl_create(&zap->zap_m.zap_avl, mze_compare, 416 sizeof (mzap_ent_t), offsetof(mzap_ent_t, mze_node)); 417 418 for (i = 0; i < zap->zap_m.zap_num_chunks; i++) { 419 mzap_ent_phys_t *mze = 420 &zap_m_phys(zap)->mz_chunk[i]; 421 if (mze->mze_name[0]) { 422 zap_name_t *zn; 423 424 zn = zap_name_alloc(zap, mze->mze_name, 425 MT_EXACT); 426 if (mze_insert(zap, i, zn->zn_hash) == 0) 427 zap->zap_m.zap_num_entries++; 428 else { 429 printf("ZFS WARNING: Duplicated ZAP " 430 "entry detected (%s).\n", 431 mze->mze_name); 432 } 433 zap_name_free(zn); 434 } 435 } 436 } else { 437 zap->zap_salt = zap_f_phys(zap)->zap_salt; 438 zap->zap_normflags = zap_f_phys(zap)->zap_normflags; 439 440 ASSERT3U(sizeof (struct zap_leaf_header), ==, 441 2*ZAP_LEAF_CHUNKSIZE); 442 443 /* 444 * The embedded pointer table should not overlap the 445 * other members. 446 */ 447 ASSERT3P(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), >, 448 &zap_f_phys(zap)->zap_salt); 449 450 /* 451 * The embedded pointer table should end at the end of 452 * the block 453 */ 454 ASSERT3U((uintptr_t)&ZAP_EMBEDDED_PTRTBL_ENT(zap, 455 1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)) - 456 (uintptr_t)zap_f_phys(zap), ==, 457 zap->zap_dbuf->db_size); 458 } 459 rw_exit(&zap->zap_rwlock); 460 return (zap); 461} 462 463static int 464zap_lockdir_impl(dmu_buf_t *db, void *tag, dmu_tx_t *tx, 465 krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp) 466{ 467 zap_t *zap; 468 krw_t lt; 469 470 ASSERT0(db->db_offset); 471 objset_t *os = dmu_buf_get_objset(db); 472 uint64_t obj = db->db_object; 473 474 *zapp = NULL; 475 476#ifdef ZFS_DEBUG 477 { 478 dmu_object_info_t doi; 479 dmu_object_info_from_db(db, &doi); 480 ASSERT3U(DMU_OT_BYTESWAP(doi.doi_type), ==, DMU_BSWAP_ZAP); 481 } 482#endif 483 484 zap = dmu_buf_get_user(db); 485 if (zap == NULL) 486 zap = mzap_open(os, obj, db); 487 488 /* 489 * We're checking zap_ismicro without the lock held, in order to 490 * tell what type of lock we want. Once we have some sort of 491 * lock, see if it really is the right type. In practice this 492 * can only be different if it was upgraded from micro to fat, 493 * and micro wanted WRITER but fat only needs READER. 494 */ 495 lt = (!zap->zap_ismicro && fatreader) ? RW_READER : lti; 496 rw_enter(&zap->zap_rwlock, lt); 497 if (lt != ((!zap->zap_ismicro && fatreader) ? RW_READER : lti)) { 498 /* it was upgraded, now we only need reader */ 499 ASSERT(lt == RW_WRITER); 500 ASSERT(RW_READER == 501 (!zap->zap_ismicro && fatreader) ? RW_READER : lti); 502 rw_downgrade(&zap->zap_rwlock); 503 lt = RW_READER; 504 } 505 506 zap->zap_objset = os; 507 508 if (lt == RW_WRITER) 509 dmu_buf_will_dirty(db, tx); 510 511 ASSERT3P(zap->zap_dbuf, ==, db); 512 513 ASSERT(!zap->zap_ismicro || 514 zap->zap_m.zap_num_entries <= zap->zap_m.zap_num_chunks); 515 if (zap->zap_ismicro && tx && adding && 516 zap->zap_m.zap_num_entries == zap->zap_m.zap_num_chunks) { 517 uint64_t newsz = db->db_size + SPA_MINBLOCKSIZE; 518 if (newsz > MZAP_MAX_BLKSZ) { 519 dprintf("upgrading obj %llu: num_entries=%u\n", 520 obj, zap->zap_m.zap_num_entries); 521 *zapp = zap; 522 int err = mzap_upgrade(zapp, tag, tx, 0); 523 if (err != 0) 524 rw_exit(&zap->zap_rwlock); 525 return (err); 526 } 527 VERIFY0(dmu_object_set_blocksize(os, obj, newsz, 0, tx)); 528 zap->zap_m.zap_num_chunks = 529 db->db_size / MZAP_ENT_LEN - 1; 530 } 531 532 *zapp = zap; 533 return (0); 534} 535 536int 537zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx, 538 krw_t lti, boolean_t fatreader, boolean_t adding, void *tag, zap_t **zapp) 539{ 540 dmu_buf_t *db; 541 int err; 542 543 err = dmu_buf_hold(os, obj, 0, tag, &db, DMU_READ_NO_PREFETCH); 544 if (err != 0) 545 return (err); 546 err = zap_lockdir_impl(db, tag, tx, lti, fatreader, adding, zapp); 547 if (err != 0) 548 dmu_buf_rele(db, tag); 549 return (err); 550} 551 552void 553zap_unlockdir(zap_t *zap, void *tag) 554{ 555 rw_exit(&zap->zap_rwlock); 556 dmu_buf_rele(zap->zap_dbuf, tag); 557} 558 559static int 560mzap_upgrade(zap_t **zapp, void *tag, dmu_tx_t *tx, zap_flags_t flags) 561{ 562 mzap_phys_t *mzp; 563 int i, sz, nchunks; 564 int err = 0; 565 zap_t *zap = *zapp; 566 567 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 568 569 sz = zap->zap_dbuf->db_size; 570 mzp = zio_buf_alloc(sz); 571 bcopy(zap->zap_dbuf->db_data, mzp, sz); 572 nchunks = zap->zap_m.zap_num_chunks; 573 574 if (!flags) { 575 err = dmu_object_set_blocksize(zap->zap_objset, zap->zap_object, 576 1ULL << fzap_default_block_shift, 0, tx); 577 if (err) { 578 zio_buf_free(mzp, sz); 579 return (err); 580 } 581 } 582 583 dprintf("upgrading obj=%llu with %u chunks\n", 584 zap->zap_object, nchunks); 585 /* XXX destroy the avl later, so we can use the stored hash value */ 586 mze_destroy(zap); 587 588 fzap_upgrade(zap, tx, flags); 589 590 for (i = 0; i < nchunks; i++) { 591 mzap_ent_phys_t *mze = &mzp->mz_chunk[i]; 592 zap_name_t *zn; 593 if (mze->mze_name[0] == 0) 594 continue; 595 dprintf("adding %s=%llu\n", 596 mze->mze_name, mze->mze_value); 597 zn = zap_name_alloc(zap, mze->mze_name, MT_EXACT); 598 err = fzap_add_cd(zn, 8, 1, &mze->mze_value, mze->mze_cd, 599 tag, tx); 600 zap = zn->zn_zap; /* fzap_add_cd() may change zap */ 601 zap_name_free(zn); 602 if (err) 603 break; 604 } 605 zio_buf_free(mzp, sz); 606 *zapp = zap; 607 return (err); 608} 609 610void 611mzap_create_impl(objset_t *os, uint64_t obj, int normflags, zap_flags_t flags, 612 dmu_tx_t *tx) 613{ 614 dmu_buf_t *db; 615 mzap_phys_t *zp; 616 617 VERIFY(0 == dmu_buf_hold(os, obj, 0, FTAG, &db, DMU_READ_NO_PREFETCH)); 618 619#ifdef ZFS_DEBUG 620 { 621 dmu_object_info_t doi; 622 dmu_object_info_from_db(db, &doi); 623 ASSERT3U(DMU_OT_BYTESWAP(doi.doi_type), ==, DMU_BSWAP_ZAP); 624 } 625#endif 626 627 dmu_buf_will_dirty(db, tx); 628 zp = db->db_data; 629 zp->mz_block_type = ZBT_MICRO; 630 zp->mz_salt = ((uintptr_t)db ^ (uintptr_t)tx ^ (obj << 1)) | 1ULL; 631 zp->mz_normflags = normflags; 632 dmu_buf_rele(db, FTAG); 633 634 if (flags != 0) { 635 zap_t *zap; 636 /* Only fat zap supports flags; upgrade immediately. */ 637 VERIFY(0 == zap_lockdir(os, obj, tx, RW_WRITER, 638 B_FALSE, B_FALSE, FTAG, &zap)); 639 VERIFY3U(0, ==, mzap_upgrade(&zap, FTAG, tx, flags)); 640 zap_unlockdir(zap, FTAG); 641 } 642} 643 644int 645zap_create_claim(objset_t *os, uint64_t obj, dmu_object_type_t ot, 646 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 647{ 648 return (zap_create_claim_norm(os, obj, 649 0, ot, bonustype, bonuslen, tx)); 650} 651 652int 653zap_create_claim_norm(objset_t *os, uint64_t obj, int normflags, 654 dmu_object_type_t ot, 655 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 656{ 657 int err; 658 659 err = dmu_object_claim(os, obj, ot, 0, bonustype, bonuslen, tx); 660 if (err != 0) 661 return (err); 662 mzap_create_impl(os, obj, normflags, 0, tx); 663 return (0); 664} 665 666uint64_t 667zap_create(objset_t *os, dmu_object_type_t ot, 668 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 669{ 670 return (zap_create_norm(os, 0, ot, bonustype, bonuslen, tx)); 671} 672 673uint64_t 674zap_create_norm(objset_t *os, int normflags, dmu_object_type_t ot, 675 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 676{ 677 uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx); 678 679 mzap_create_impl(os, obj, normflags, 0, tx); 680 return (obj); 681} 682 683uint64_t 684zap_create_flags(objset_t *os, int normflags, zap_flags_t flags, 685 dmu_object_type_t ot, int leaf_blockshift, int indirect_blockshift, 686 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 687{ 688 uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx); 689 690 ASSERT(leaf_blockshift >= SPA_MINBLOCKSHIFT && 691 leaf_blockshift <= SPA_OLD_MAXBLOCKSHIFT && 692 indirect_blockshift >= SPA_MINBLOCKSHIFT && 693 indirect_blockshift <= SPA_OLD_MAXBLOCKSHIFT); 694 695 VERIFY(dmu_object_set_blocksize(os, obj, 696 1ULL << leaf_blockshift, indirect_blockshift, tx) == 0); 697 698 mzap_create_impl(os, obj, normflags, flags, tx); 699 return (obj); 700} 701 702int 703zap_destroy(objset_t *os, uint64_t zapobj, dmu_tx_t *tx) 704{ 705 /* 706 * dmu_object_free will free the object number and free the 707 * data. Freeing the data will cause our pageout function to be 708 * called, which will destroy our data (zap_leaf_t's and zap_t). 709 */ 710 711 return (dmu_object_free(os, zapobj, tx)); 712} 713 714void 715zap_evict(void *dbu) 716{ 717 zap_t *zap = dbu; 718 719 rw_destroy(&zap->zap_rwlock); 720 721 if (zap->zap_ismicro) 722 mze_destroy(zap); 723 else 724 mutex_destroy(&zap->zap_f.zap_num_entries_mtx); 725 726 kmem_free(zap, sizeof (zap_t)); 727} 728 729int 730zap_count(objset_t *os, uint64_t zapobj, uint64_t *count) 731{ 732 zap_t *zap; 733 int err; 734 735 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 736 if (err) 737 return (err); 738 if (!zap->zap_ismicro) { 739 err = fzap_count(zap, count); 740 } else { 741 *count = zap->zap_m.zap_num_entries; 742 } 743 zap_unlockdir(zap, FTAG); 744 return (err); 745} 746 747/* 748 * zn may be NULL; if not specified, it will be computed if needed. 749 * See also the comment above zap_entry_normalization_conflict(). 750 */ 751static boolean_t 752mzap_normalization_conflict(zap_t *zap, zap_name_t *zn, mzap_ent_t *mze) 753{ 754 mzap_ent_t *other; 755 int direction = AVL_BEFORE; 756 boolean_t allocdzn = B_FALSE; 757 758 if (zap->zap_normflags == 0) 759 return (B_FALSE); 760 761again: 762 for (other = avl_walk(&zap->zap_m.zap_avl, mze, direction); 763 other && other->mze_hash == mze->mze_hash; 764 other = avl_walk(&zap->zap_m.zap_avl, other, direction)) { 765 766 if (zn == NULL) { 767 zn = zap_name_alloc(zap, MZE_PHYS(zap, mze)->mze_name, 768 MT_FIRST); 769 allocdzn = B_TRUE; 770 } 771 if (zap_match(zn, MZE_PHYS(zap, other)->mze_name)) { 772 if (allocdzn) 773 zap_name_free(zn); 774 return (B_TRUE); 775 } 776 } 777 778 if (direction == AVL_BEFORE) { 779 direction = AVL_AFTER; 780 goto again; 781 } 782 783 if (allocdzn) 784 zap_name_free(zn); 785 return (B_FALSE); 786} 787 788/* 789 * Routines for manipulating attributes. 790 */ 791 792int 793zap_lookup(objset_t *os, uint64_t zapobj, const char *name, 794 uint64_t integer_size, uint64_t num_integers, void *buf) 795{ 796 return (zap_lookup_norm(os, zapobj, name, integer_size, 797 num_integers, buf, MT_EXACT, NULL, 0, NULL)); 798} 799 800static int 801zap_lookup_impl(zap_t *zap, const char *name, 802 uint64_t integer_size, uint64_t num_integers, void *buf, 803 matchtype_t mt, char *realname, int rn_len, 804 boolean_t *ncp) 805{ 806 int err = 0; 807 mzap_ent_t *mze; 808 zap_name_t *zn; 809 810 zn = zap_name_alloc(zap, name, mt); 811 if (zn == NULL) 812 return (SET_ERROR(ENOTSUP)); 813 814 if (!zap->zap_ismicro) { 815 err = fzap_lookup(zn, integer_size, num_integers, buf, 816 realname, rn_len, ncp); 817 } else { 818 mze = mze_find(zn); 819 if (mze == NULL) { 820 err = SET_ERROR(ENOENT); 821 } else { 822 if (num_integers < 1) { 823 err = SET_ERROR(EOVERFLOW); 824 } else if (integer_size != 8) { 825 err = SET_ERROR(EINVAL); 826 } else { 827 *(uint64_t *)buf = 828 MZE_PHYS(zap, mze)->mze_value; 829 (void) strlcpy(realname, 830 MZE_PHYS(zap, mze)->mze_name, rn_len); 831 if (ncp) { 832 *ncp = mzap_normalization_conflict(zap, 833 zn, mze); 834 } 835 } 836 } 837 } 838 zap_name_free(zn); 839 return (err); 840} 841 842int 843zap_lookup_norm(objset_t *os, uint64_t zapobj, const char *name, 844 uint64_t integer_size, uint64_t num_integers, void *buf, 845 matchtype_t mt, char *realname, int rn_len, 846 boolean_t *ncp) 847{ 848 zap_t *zap; 849 int err; 850 851 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 852 if (err != 0) 853 return (err); 854 err = zap_lookup_impl(zap, name, integer_size, 855 num_integers, buf, mt, realname, rn_len, ncp); 856 zap_unlockdir(zap, FTAG); 857 return (err); 858} 859 860int 861zap_prefetch_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 862 int key_numints) 863{ 864 zap_t *zap; 865 int err; 866 zap_name_t *zn; 867 868 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 869 if (err) 870 return (err); 871 zn = zap_name_alloc_uint64(zap, key, key_numints); 872 if (zn == NULL) { 873 zap_unlockdir(zap, FTAG); 874 return (SET_ERROR(ENOTSUP)); 875 } 876 877 fzap_prefetch(zn); 878 zap_name_free(zn); 879 zap_unlockdir(zap, FTAG); 880 return (err); 881} 882 883int 884zap_lookup_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 885 int key_numints, uint64_t integer_size, uint64_t num_integers, void *buf) 886{ 887 zap_t *zap; 888 int err; 889 zap_name_t *zn; 890 891 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 892 if (err) 893 return (err); 894 zn = zap_name_alloc_uint64(zap, key, key_numints); 895 if (zn == NULL) { 896 zap_unlockdir(zap, FTAG); 897 return (SET_ERROR(ENOTSUP)); 898 } 899 900 err = fzap_lookup(zn, integer_size, num_integers, buf, 901 NULL, 0, NULL); 902 zap_name_free(zn); 903 zap_unlockdir(zap, FTAG); 904 return (err); 905} 906 907int 908zap_contains(objset_t *os, uint64_t zapobj, const char *name) 909{ 910 int err = zap_lookup_norm(os, zapobj, name, 0, 911 0, NULL, MT_EXACT, NULL, 0, NULL); 912 if (err == EOVERFLOW || err == EINVAL) 913 err = 0; /* found, but skipped reading the value */ 914 return (err); 915} 916 917int 918zap_length(objset_t *os, uint64_t zapobj, const char *name, 919 uint64_t *integer_size, uint64_t *num_integers) 920{ 921 zap_t *zap; 922 int err; 923 mzap_ent_t *mze; 924 zap_name_t *zn; 925 926 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 927 if (err) 928 return (err); 929 zn = zap_name_alloc(zap, name, MT_EXACT); 930 if (zn == NULL) { 931 zap_unlockdir(zap, FTAG); 932 return (SET_ERROR(ENOTSUP)); 933 } 934 if (!zap->zap_ismicro) { 935 err = fzap_length(zn, integer_size, num_integers); 936 } else { 937 mze = mze_find(zn); 938 if (mze == NULL) { 939 err = SET_ERROR(ENOENT); 940 } else { 941 if (integer_size) 942 *integer_size = 8; 943 if (num_integers) 944 *num_integers = 1; 945 } 946 } 947 zap_name_free(zn); 948 zap_unlockdir(zap, FTAG); 949 return (err); 950} 951 952int 953zap_length_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 954 int key_numints, uint64_t *integer_size, uint64_t *num_integers) 955{ 956 zap_t *zap; 957 int err; 958 zap_name_t *zn; 959 960 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 961 if (err) 962 return (err); 963 zn = zap_name_alloc_uint64(zap, key, key_numints); 964 if (zn == NULL) { 965 zap_unlockdir(zap, FTAG); 966 return (SET_ERROR(ENOTSUP)); 967 } 968 err = fzap_length(zn, integer_size, num_integers); 969 zap_name_free(zn); 970 zap_unlockdir(zap, FTAG); 971 return (err); 972} 973 974static void 975mzap_addent(zap_name_t *zn, uint64_t value) 976{ 977 int i; 978 zap_t *zap = zn->zn_zap; 979 int start = zap->zap_m.zap_alloc_next; 980 uint32_t cd; 981 982 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 983 984#ifdef ZFS_DEBUG 985 for (i = 0; i < zap->zap_m.zap_num_chunks; i++) { 986 mzap_ent_phys_t *mze = &zap_m_phys(zap)->mz_chunk[i]; 987 ASSERT(strcmp(zn->zn_key_orig, mze->mze_name) != 0); 988 } 989#endif 990 991 cd = mze_find_unused_cd(zap, zn->zn_hash); 992 /* given the limited size of the microzap, this can't happen */ 993 ASSERT(cd < zap_maxcd(zap)); 994 995again: 996 for (i = start; i < zap->zap_m.zap_num_chunks; i++) { 997 mzap_ent_phys_t *mze = &zap_m_phys(zap)->mz_chunk[i]; 998 if (mze->mze_name[0] == 0) { 999 mze->mze_value = value; 1000 mze->mze_cd = cd; 1001 (void) strcpy(mze->mze_name, zn->zn_key_orig); 1002 zap->zap_m.zap_num_entries++; 1003 zap->zap_m.zap_alloc_next = i+1; 1004 if (zap->zap_m.zap_alloc_next == 1005 zap->zap_m.zap_num_chunks) 1006 zap->zap_m.zap_alloc_next = 0; 1007 VERIFY(0 == mze_insert(zap, i, zn->zn_hash)); 1008 return; 1009 } 1010 } 1011 if (start != 0) { 1012 start = 0; 1013 goto again; 1014 } 1015 ASSERT(!"out of entries!"); 1016} 1017 1018int 1019zap_add(objset_t *os, uint64_t zapobj, const char *key, 1020 int integer_size, uint64_t num_integers, 1021 const void *val, dmu_tx_t *tx) 1022{ 1023 zap_t *zap; 1024 int err; 1025 mzap_ent_t *mze; 1026 const uint64_t *intval = val; 1027 zap_name_t *zn; 1028 1029 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1030 if (err) 1031 return (err); 1032 zn = zap_name_alloc(zap, key, MT_EXACT); 1033 if (zn == NULL) { 1034 zap_unlockdir(zap, FTAG); 1035 return (SET_ERROR(ENOTSUP)); 1036 } 1037 if (!zap->zap_ismicro) { 1038 err = fzap_add(zn, integer_size, num_integers, val, FTAG, tx); 1039 zap = zn->zn_zap; /* fzap_add() may change zap */ 1040 } else if (integer_size != 8 || num_integers != 1 || 1041 strlen(key) >= MZAP_NAME_LEN) { 1042 err = mzap_upgrade(&zn->zn_zap, FTAG, tx, 0); 1043 if (err == 0) { 1044 err = fzap_add(zn, integer_size, num_integers, val, 1045 FTAG, tx); 1046 } 1047 zap = zn->zn_zap; /* fzap_add() may change zap */ 1048 } else { 1049 mze = mze_find(zn); 1050 if (mze != NULL) { 1051 err = SET_ERROR(EEXIST); 1052 } else { 1053 mzap_addent(zn, *intval); 1054 } 1055 } 1056 ASSERT(zap == zn->zn_zap); 1057 zap_name_free(zn); 1058 if (zap != NULL) /* may be NULL if fzap_add() failed */ 1059 zap_unlockdir(zap, FTAG); 1060 return (err); 1061} 1062 1063int 1064zap_add_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 1065 int key_numints, int integer_size, uint64_t num_integers, 1066 const void *val, dmu_tx_t *tx) 1067{ 1068 zap_t *zap; 1069 int err; 1070 zap_name_t *zn; 1071 1072 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1073 if (err) 1074 return (err); 1075 zn = zap_name_alloc_uint64(zap, key, key_numints); 1076 if (zn == NULL) { 1077 zap_unlockdir(zap, FTAG); 1078 return (SET_ERROR(ENOTSUP)); 1079 } 1080 err = fzap_add(zn, integer_size, num_integers, val, FTAG, tx); 1081 zap = zn->zn_zap; /* fzap_add() may change zap */ 1082 zap_name_free(zn); 1083 if (zap != NULL) /* may be NULL if fzap_add() failed */ 1084 zap_unlockdir(zap, FTAG); 1085 return (err); 1086} 1087 1088int 1089zap_update(objset_t *os, uint64_t zapobj, const char *name, 1090 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx) 1091{ 1092 zap_t *zap; 1093 mzap_ent_t *mze; 1094 uint64_t oldval; 1095 const uint64_t *intval = val; 1096 zap_name_t *zn; 1097 int err; 1098 1099#ifdef ZFS_DEBUG 1100 /* 1101 * If there is an old value, it shouldn't change across the 1102 * lockdir (eg, due to bprewrite's xlation). 1103 */ 1104 if (integer_size == 8 && num_integers == 1) 1105 (void) zap_lookup(os, zapobj, name, 8, 1, &oldval); 1106#endif 1107 1108 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1109 if (err) 1110 return (err); 1111 zn = zap_name_alloc(zap, name, MT_EXACT); 1112 if (zn == NULL) { 1113 zap_unlockdir(zap, FTAG); 1114 return (SET_ERROR(ENOTSUP)); 1115 } 1116 if (!zap->zap_ismicro) { 1117 err = fzap_update(zn, integer_size, num_integers, val, 1118 FTAG, tx); 1119 zap = zn->zn_zap; /* fzap_update() may change zap */ 1120 } else if (integer_size != 8 || num_integers != 1 || 1121 strlen(name) >= MZAP_NAME_LEN) { 1122 dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n", 1123 zapobj, integer_size, num_integers, name); 1124 err = mzap_upgrade(&zn->zn_zap, FTAG, tx, 0); 1125 if (err == 0) { 1126 err = fzap_update(zn, integer_size, num_integers, 1127 val, FTAG, tx); 1128 } 1129 zap = zn->zn_zap; /* fzap_update() may change zap */ 1130 } else { 1131 mze = mze_find(zn); 1132 if (mze != NULL) { 1133 ASSERT3U(MZE_PHYS(zap, mze)->mze_value, ==, oldval); 1134 MZE_PHYS(zap, mze)->mze_value = *intval; 1135 } else { 1136 mzap_addent(zn, *intval); 1137 } 1138 } 1139 ASSERT(zap == zn->zn_zap); 1140 zap_name_free(zn); 1141 if (zap != NULL) /* may be NULL if fzap_upgrade() failed */ 1142 zap_unlockdir(zap, FTAG); 1143 return (err); 1144} 1145 1146int 1147zap_update_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 1148 int key_numints, 1149 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx) 1150{ 1151 zap_t *zap; 1152 zap_name_t *zn; 1153 int err; 1154 1155 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap); 1156 if (err) 1157 return (err); 1158 zn = zap_name_alloc_uint64(zap, key, key_numints); 1159 if (zn == NULL) { 1160 zap_unlockdir(zap, FTAG); 1161 return (SET_ERROR(ENOTSUP)); 1162 } 1163 err = fzap_update(zn, integer_size, num_integers, val, FTAG, tx); 1164 zap = zn->zn_zap; /* fzap_update() may change zap */ 1165 zap_name_free(zn); 1166 if (zap != NULL) /* may be NULL if fzap_upgrade() failed */ 1167 zap_unlockdir(zap, FTAG); 1168 return (err); 1169} 1170 1171int 1172zap_remove(objset_t *os, uint64_t zapobj, const char *name, dmu_tx_t *tx) 1173{ 1174 return (zap_remove_norm(os, zapobj, name, MT_EXACT, tx)); 1175} 1176 1177int 1178zap_remove_norm(objset_t *os, uint64_t zapobj, const char *name, 1179 matchtype_t mt, dmu_tx_t *tx) 1180{ 1181 zap_t *zap; 1182 int err; 1183 mzap_ent_t *mze; 1184 zap_name_t *zn; 1185 1186 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, FTAG, &zap); 1187 if (err) 1188 return (err); 1189 zn = zap_name_alloc(zap, name, mt); 1190 if (zn == NULL) { 1191 zap_unlockdir(zap, FTAG); 1192 return (SET_ERROR(ENOTSUP)); 1193 } 1194 if (!zap->zap_ismicro) { 1195 err = fzap_remove(zn, tx); 1196 } else { 1197 mze = mze_find(zn); 1198 if (mze == NULL) { 1199 err = SET_ERROR(ENOENT); 1200 } else { 1201 zap->zap_m.zap_num_entries--; 1202 bzero(&zap_m_phys(zap)->mz_chunk[mze->mze_chunkid], 1203 sizeof (mzap_ent_phys_t)); 1204 mze_remove(zap, mze); 1205 } 1206 } 1207 zap_name_free(zn); 1208 zap_unlockdir(zap, FTAG); 1209 return (err); 1210} 1211 1212int 1213zap_remove_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key, 1214 int key_numints, dmu_tx_t *tx) 1215{ 1216 zap_t *zap; 1217 int err; 1218 zap_name_t *zn; 1219 1220 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, FTAG, &zap); 1221 if (err) 1222 return (err); 1223 zn = zap_name_alloc_uint64(zap, key, key_numints); 1224 if (zn == NULL) { 1225 zap_unlockdir(zap, FTAG); 1226 return (SET_ERROR(ENOTSUP)); 1227 } 1228 err = fzap_remove(zn, tx); 1229 zap_name_free(zn); 1230 zap_unlockdir(zap, FTAG); 1231 return (err); 1232} 1233 1234/* 1235 * Routines for iterating over the attributes. 1236 */ 1237 1238void 1239zap_cursor_init_serialized(zap_cursor_t *zc, objset_t *os, uint64_t zapobj, 1240 uint64_t serialized) 1241{ 1242 zc->zc_objset = os; 1243 zc->zc_zap = NULL; 1244 zc->zc_leaf = NULL; 1245 zc->zc_zapobj = zapobj; 1246 zc->zc_serialized = serialized; 1247 zc->zc_hash = 0; 1248 zc->zc_cd = 0; 1249} 1250 1251void 1252zap_cursor_init(zap_cursor_t *zc, objset_t *os, uint64_t zapobj) 1253{ 1254 zap_cursor_init_serialized(zc, os, zapobj, 0); 1255} 1256 1257void 1258zap_cursor_fini(zap_cursor_t *zc) 1259{ 1260 if (zc->zc_zap) { 1261 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER); 1262 zap_unlockdir(zc->zc_zap, NULL); 1263 zc->zc_zap = NULL; 1264 } 1265 if (zc->zc_leaf) { 1266 rw_enter(&zc->zc_leaf->l_rwlock, RW_READER); 1267 zap_put_leaf(zc->zc_leaf); 1268 zc->zc_leaf = NULL; 1269 } 1270 zc->zc_objset = NULL; 1271} 1272 1273uint64_t 1274zap_cursor_serialize(zap_cursor_t *zc) 1275{ 1276 if (zc->zc_hash == -1ULL) 1277 return (-1ULL); 1278 if (zc->zc_zap == NULL) 1279 return (zc->zc_serialized); 1280 ASSERT((zc->zc_hash & zap_maxcd(zc->zc_zap)) == 0); 1281 ASSERT(zc->zc_cd < zap_maxcd(zc->zc_zap)); 1282 1283 /* 1284 * We want to keep the high 32 bits of the cursor zero if we can, so 1285 * that 32-bit programs can access this. So usually use a small 1286 * (28-bit) hash value so we can fit 4 bits of cd into the low 32-bits 1287 * of the cursor. 1288 * 1289 * [ collision differentiator | zap_hashbits()-bit hash value ] 1290 */ 1291 return ((zc->zc_hash >> (64 - zap_hashbits(zc->zc_zap))) | 1292 ((uint64_t)zc->zc_cd << zap_hashbits(zc->zc_zap))); 1293} 1294 1295int 1296zap_cursor_retrieve(zap_cursor_t *zc, zap_attribute_t *za) 1297{ 1298 int err; 1299 avl_index_t idx; 1300 mzap_ent_t mze_tofind; 1301 mzap_ent_t *mze; 1302 1303 if (zc->zc_hash == -1ULL) 1304 return (SET_ERROR(ENOENT)); 1305 1306 if (zc->zc_zap == NULL) { 1307 int hb; 1308 err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL, 1309 RW_READER, TRUE, FALSE, NULL, &zc->zc_zap); 1310 if (err) 1311 return (err); 1312 1313 /* 1314 * To support zap_cursor_init_serialized, advance, retrieve, 1315 * we must add to the existing zc_cd, which may already 1316 * be 1 due to the zap_cursor_advance. 1317 */ 1318 ASSERT(zc->zc_hash == 0); 1319 hb = zap_hashbits(zc->zc_zap); 1320 zc->zc_hash = zc->zc_serialized << (64 - hb); 1321 zc->zc_cd += zc->zc_serialized >> hb; 1322 if (zc->zc_cd >= zap_maxcd(zc->zc_zap)) /* corrupt serialized */ 1323 zc->zc_cd = 0; 1324 } else { 1325 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER); 1326 } 1327 if (!zc->zc_zap->zap_ismicro) { 1328 err = fzap_cursor_retrieve(zc->zc_zap, zc, za); 1329 } else { 1330 mze_tofind.mze_hash = zc->zc_hash; 1331 mze_tofind.mze_cd = zc->zc_cd; 1332 1333 mze = avl_find(&zc->zc_zap->zap_m.zap_avl, &mze_tofind, &idx); 1334 if (mze == NULL) { 1335 mze = avl_nearest(&zc->zc_zap->zap_m.zap_avl, 1336 idx, AVL_AFTER); 1337 } 1338 if (mze) { 1339 mzap_ent_phys_t *mzep = MZE_PHYS(zc->zc_zap, mze); 1340 ASSERT3U(mze->mze_cd, ==, mzep->mze_cd); 1341 za->za_normalization_conflict = 1342 mzap_normalization_conflict(zc->zc_zap, NULL, mze); 1343 za->za_integer_length = 8; 1344 za->za_num_integers = 1; 1345 za->za_first_integer = mzep->mze_value; 1346 (void) strcpy(za->za_name, mzep->mze_name); 1347 zc->zc_hash = mze->mze_hash; 1348 zc->zc_cd = mze->mze_cd; 1349 err = 0; 1350 } else { 1351 zc->zc_hash = -1ULL; 1352 err = SET_ERROR(ENOENT); 1353 } 1354 } 1355 rw_exit(&zc->zc_zap->zap_rwlock); 1356 return (err); 1357} 1358 1359void 1360zap_cursor_advance(zap_cursor_t *zc) 1361{ 1362 if (zc->zc_hash == -1ULL) 1363 return; 1364 zc->zc_cd++; 1365} 1366 1367int 1368zap_cursor_move_to_key(zap_cursor_t *zc, const char *name, matchtype_t mt) 1369{ 1370 int err = 0; 1371 mzap_ent_t *mze; 1372 zap_name_t *zn; 1373 1374 if (zc->zc_zap == NULL) { 1375 err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL, 1376 RW_READER, TRUE, FALSE, &zc->zc_zap); 1377 if (err) 1378 return (err); 1379 } else { 1380 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER); 1381 } 1382 1383 zn = zap_name_alloc(zc->zc_zap, name, mt); 1384 if (zn == NULL) { 1385 rw_exit(&zc->zc_zap->zap_rwlock); 1386 return (SET_ERROR(ENOTSUP)); 1387 } 1388 1389 if (!zc->zc_zap->zap_ismicro) { 1390 err = fzap_cursor_move_to_key(zc, zn); 1391 } else { 1392 mze = mze_find(zn); 1393 if (mze == NULL) { 1394 err = SET_ERROR(ENOENT); 1395 goto out; 1396 } 1397 zc->zc_hash = mze->mze_hash; 1398 zc->zc_cd = mze->mze_cd; 1399 } 1400 1401out: 1402 zap_name_free(zn); 1403 rw_exit(&zc->zc_zap->zap_rwlock); 1404 return (err); 1405} 1406 1407int 1408zap_get_stats(objset_t *os, uint64_t zapobj, zap_stats_t *zs) 1409{ 1410 int err; 1411 zap_t *zap; 1412 1413 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap); 1414 if (err) 1415 return (err); 1416 1417 bzero(zs, sizeof (zap_stats_t)); 1418 1419 if (zap->zap_ismicro) { 1420 zs->zs_blocksize = zap->zap_dbuf->db_size; 1421 zs->zs_num_entries = zap->zap_m.zap_num_entries; 1422 zs->zs_num_blocks = 1; 1423 } else { 1424 fzap_get_stats(zap, zs); 1425 } 1426 zap_unlockdir(zap, FTAG); 1427 return (0); 1428} 1429 1430int 1431zap_count_write(objset_t *os, uint64_t zapobj, const char *name, int add, 1432 refcount_t *towrite, refcount_t *tooverwrite) 1433{ 1434 zap_t *zap; 1435 int err = 0; 1436 1437 /* 1438 * Since, we don't have a name, we cannot figure out which blocks will 1439 * be affected in this operation. So, account for the worst case : 1440 * - 3 blocks overwritten: target leaf, ptrtbl block, header block 1441 * - 4 new blocks written if adding: 1442 * - 2 blocks for possibly split leaves, 1443 * - 2 grown ptrtbl blocks 1444 * 1445 * This also accommodates the case where an add operation to a fairly 1446 * large microzap results in a promotion to fatzap. 1447 */ 1448 if (name == NULL) { 1449 (void) refcount_add_many(towrite, 1450 (3 + (add ? 4 : 0)) * SPA_OLD_MAXBLOCKSIZE, FTAG); 1451 return (err); 1452 } 1453 1454 /* 1455 * We lock the zap with adding == FALSE. Because, if we pass 1456 * the actual value of add, it could trigger a mzap_upgrade(). 1457 * At present we are just evaluating the possibility of this operation 1458 * and hence we do not want to trigger an upgrade. 1459 */ 1460 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, 1461 FTAG, &zap); 1462 if (err != 0) 1463 return (err); 1464 1465 if (!zap->zap_ismicro) { 1466 zap_name_t *zn = zap_name_alloc(zap, name, MT_EXACT); 1467 if (zn) { 1468 err = fzap_count_write(zn, add, towrite, 1469 tooverwrite); 1470 zap_name_free(zn); 1471 } else { 1472 /* 1473 * We treat this case as similar to (name == NULL) 1474 */ 1475 (void) refcount_add_many(towrite, 1476 (3 + (add ? 4 : 0)) * SPA_OLD_MAXBLOCKSIZE, FTAG); 1477 } 1478 } else { 1479 /* 1480 * We are here if (name != NULL) and this is a micro-zap. 1481 * We account for the header block depending on whether it 1482 * is freeable. 1483 * 1484 * Incase of an add-operation it is hard to find out 1485 * if this add will promote this microzap to fatzap. 1486 * Hence, we consider the worst case and account for the 1487 * blocks assuming this microzap would be promoted to a 1488 * fatzap. 1489 * 1490 * 1 block overwritten : header block 1491 * 4 new blocks written : 2 new split leaf, 2 grown 1492 * ptrtbl blocks 1493 */ 1494 if (dmu_buf_freeable(zap->zap_dbuf)) { 1495 (void) refcount_add_many(tooverwrite, 1496 MZAP_MAX_BLKSZ, FTAG); 1497 } else { 1498 (void) refcount_add_many(towrite, 1499 MZAP_MAX_BLKSZ, FTAG); 1500 } 1501 1502 if (add) { 1503 (void) refcount_add_many(towrite, 1504 4 * MZAP_MAX_BLKSZ, FTAG); 1505 } 1506 } 1507 1508 zap_unlockdir(zap, FTAG); 1509 return (err); 1510} 1511