zap_micro.c revision 197172
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 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26#pragma ident "%Z%%M% %I% %E% SMI" 27 28#include <sys/spa.h> 29#include <sys/dmu.h> 30#include <sys/zfs_context.h> 31#include <sys/zap.h> 32#include <sys/refcount.h> 33#include <sys/zap_impl.h> 34#include <sys/zap_leaf.h> 35#include <sys/avl.h> 36 37#ifdef _KERNEL 38#include <sys/sunddi.h> 39#endif 40 41static int mzap_upgrade(zap_t **zapp, dmu_tx_t *tx); 42 43 44static uint64_t 45zap_hash(zap_t *zap, const char *normname) 46{ 47 const uint8_t *cp; 48 uint8_t c; 49 uint64_t crc = zap->zap_salt; 50 51 /* NB: name must already be normalized, if necessary */ 52 53 ASSERT(crc != 0); 54 ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 55 for (cp = (const uint8_t *)normname; (c = *cp) != '\0'; cp++) { 56 crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ c) & 0xFF]; 57 } 58 59 /* 60 * Only use 28 bits, since we need 4 bits in the cookie for the 61 * collision differentiator. We MUST use the high bits, since 62 * those are the ones that we first pay attention to when 63 * chosing the bucket. 64 */ 65 crc &= ~((1ULL << (64 - ZAP_HASHBITS)) - 1); 66 67 return (crc); 68} 69 70static int 71zap_normalize(zap_t *zap, const char *name, char *namenorm) 72{ 73 size_t inlen, outlen; 74 int err; 75 76 inlen = strlen(name) + 1; 77 outlen = ZAP_MAXNAMELEN; 78 79 err = 0; 80 (void) u8_textprep_str((char *)name, &inlen, namenorm, &outlen, 81 zap->zap_normflags | U8_TEXTPREP_IGNORE_NULL, U8_UNICODE_LATEST, 82 &err); 83 84 return (err); 85} 86 87boolean_t 88zap_match(zap_name_t *zn, const char *matchname) 89{ 90 if (zn->zn_matchtype == MT_FIRST) { 91 char norm[ZAP_MAXNAMELEN]; 92 93 if (zap_normalize(zn->zn_zap, matchname, norm) != 0) 94 return (B_FALSE); 95 96 return (strcmp(zn->zn_name_norm, norm) == 0); 97 } else { 98 /* MT_BEST or MT_EXACT */ 99 return (strcmp(zn->zn_name_orij, matchname) == 0); 100 } 101} 102 103void 104zap_name_free(zap_name_t *zn) 105{ 106 kmem_free(zn, sizeof (zap_name_t)); 107} 108 109/* XXX combine this with zap_lockdir()? */ 110zap_name_t * 111zap_name_alloc(zap_t *zap, const char *name, matchtype_t mt) 112{ 113 zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP); 114 115 zn->zn_zap = zap; 116 zn->zn_name_orij = name; 117 zn->zn_matchtype = mt; 118 if (zap->zap_normflags) { 119 if (zap_normalize(zap, name, zn->zn_normbuf) != 0) { 120 zap_name_free(zn); 121 return (NULL); 122 } 123 zn->zn_name_norm = zn->zn_normbuf; 124 } else { 125 if (mt != MT_EXACT) { 126 zap_name_free(zn); 127 return (NULL); 128 } 129 zn->zn_name_norm = zn->zn_name_orij; 130 } 131 132 zn->zn_hash = zap_hash(zap, zn->zn_name_norm); 133 return (zn); 134} 135 136static void 137mzap_byteswap(mzap_phys_t *buf, size_t size) 138{ 139 int i, max; 140 buf->mz_block_type = BSWAP_64(buf->mz_block_type); 141 buf->mz_salt = BSWAP_64(buf->mz_salt); 142 buf->mz_normflags = BSWAP_64(buf->mz_normflags); 143 max = (size / MZAP_ENT_LEN) - 1; 144 for (i = 0; i < max; i++) { 145 buf->mz_chunk[i].mze_value = 146 BSWAP_64(buf->mz_chunk[i].mze_value); 147 buf->mz_chunk[i].mze_cd = 148 BSWAP_32(buf->mz_chunk[i].mze_cd); 149 } 150} 151 152void 153zap_byteswap(void *buf, size_t size) 154{ 155 uint64_t block_type; 156 157 block_type = *(uint64_t *)buf; 158 159 if (block_type == ZBT_MICRO || block_type == BSWAP_64(ZBT_MICRO)) { 160 /* ASSERT(magic == ZAP_LEAF_MAGIC); */ 161 mzap_byteswap(buf, size); 162 } else { 163 fzap_byteswap(buf, size); 164 } 165} 166 167static int 168mze_compare(const void *arg1, const void *arg2) 169{ 170 const mzap_ent_t *mze1 = arg1; 171 const mzap_ent_t *mze2 = arg2; 172 173 if (mze1->mze_hash > mze2->mze_hash) 174 return (+1); 175 if (mze1->mze_hash < mze2->mze_hash) 176 return (-1); 177 if (mze1->mze_phys.mze_cd > mze2->mze_phys.mze_cd) 178 return (+1); 179 if (mze1->mze_phys.mze_cd < mze2->mze_phys.mze_cd) 180 return (-1); 181 return (0); 182} 183 184static int 185mze_insert(zap_t *zap, int chunkid, uint64_t hash, mzap_ent_phys_t *mzep) 186{ 187 mzap_ent_t *mze; 188 avl_index_t idx; 189 190 ASSERT(zap->zap_ismicro); 191 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 192 ASSERT(mzep->mze_cd < ZAP_MAXCD); 193 194 mze = kmem_alloc(sizeof (mzap_ent_t), KM_SLEEP); 195 mze->mze_chunkid = chunkid; 196 mze->mze_hash = hash; 197 mze->mze_phys = *mzep; 198 if (avl_find(&zap->zap_m.zap_avl, mze, &idx) != NULL) { 199 kmem_free(mze, sizeof (mzap_ent_t)); 200 return (EEXIST); 201 } 202 avl_insert(&zap->zap_m.zap_avl, mze, idx); 203 return (0); 204} 205 206static mzap_ent_t * 207mze_find(zap_name_t *zn) 208{ 209 mzap_ent_t mze_tofind; 210 mzap_ent_t *mze; 211 avl_index_t idx; 212 avl_tree_t *avl = &zn->zn_zap->zap_m.zap_avl; 213 214 ASSERT(zn->zn_zap->zap_ismicro); 215 ASSERT(RW_LOCK_HELD(&zn->zn_zap->zap_rwlock)); 216 217 if (strlen(zn->zn_name_norm) >= sizeof (mze_tofind.mze_phys.mze_name)) 218 return (NULL); 219 220 mze_tofind.mze_hash = zn->zn_hash; 221 mze_tofind.mze_phys.mze_cd = 0; 222 223again: 224 mze = avl_find(avl, &mze_tofind, &idx); 225 if (mze == NULL) 226 mze = avl_nearest(avl, idx, AVL_AFTER); 227 for (; mze && mze->mze_hash == zn->zn_hash; mze = AVL_NEXT(avl, mze)) { 228 if (zap_match(zn, mze->mze_phys.mze_name)) 229 return (mze); 230 } 231 if (zn->zn_matchtype == MT_BEST) { 232 zn->zn_matchtype = MT_FIRST; 233 goto again; 234 } 235 return (NULL); 236} 237 238static uint32_t 239mze_find_unused_cd(zap_t *zap, uint64_t hash) 240{ 241 mzap_ent_t mze_tofind; 242 mzap_ent_t *mze; 243 avl_index_t idx; 244 avl_tree_t *avl = &zap->zap_m.zap_avl; 245 uint32_t cd; 246 247 ASSERT(zap->zap_ismicro); 248 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); 249 250 mze_tofind.mze_hash = hash; 251 mze_tofind.mze_phys.mze_cd = 0; 252 253 cd = 0; 254 for (mze = avl_find(avl, &mze_tofind, &idx); 255 mze && mze->mze_hash == hash; mze = AVL_NEXT(avl, mze)) { 256 if (mze->mze_phys.mze_cd != cd) 257 break; 258 cd++; 259 } 260 261 return (cd); 262} 263 264static void 265mze_remove(zap_t *zap, mzap_ent_t *mze) 266{ 267 ASSERT(zap->zap_ismicro); 268 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 269 270 avl_remove(&zap->zap_m.zap_avl, mze); 271 kmem_free(mze, sizeof (mzap_ent_t)); 272} 273 274static void 275mze_destroy(zap_t *zap) 276{ 277 mzap_ent_t *mze; 278 void *avlcookie = NULL; 279 280 while (mze = avl_destroy_nodes(&zap->zap_m.zap_avl, &avlcookie)) 281 kmem_free(mze, sizeof (mzap_ent_t)); 282 avl_destroy(&zap->zap_m.zap_avl); 283} 284 285static zap_t * 286mzap_open(objset_t *os, uint64_t obj, dmu_buf_t *db) 287{ 288 zap_t *winner; 289 zap_t *zap; 290 int i; 291 292 ASSERT3U(MZAP_ENT_LEN, ==, sizeof (mzap_ent_phys_t)); 293 294 zap = kmem_zalloc(sizeof (zap_t), KM_SLEEP); 295 rw_init(&zap->zap_rwlock, NULL, RW_DEFAULT, 0); 296 rw_enter(&zap->zap_rwlock, RW_WRITER); 297 zap->zap_objset = os; 298 zap->zap_object = obj; 299 zap->zap_dbuf = db; 300 301 if (*(uint64_t *)db->db_data != ZBT_MICRO) { 302 mutex_init(&zap->zap_f.zap_num_entries_mtx, NULL, 303 MUTEX_DEFAULT, 0); 304 zap->zap_f.zap_block_shift = highbit(db->db_size) - 1; 305 } else { 306 zap->zap_ismicro = TRUE; 307 } 308 309 /* 310 * Make sure that zap_ismicro is set before we let others see 311 * it, because zap_lockdir() checks zap_ismicro without the lock 312 * held. 313 */ 314 winner = dmu_buf_set_user(db, zap, &zap->zap_m.zap_phys, zap_evict); 315 316 if (winner != NULL) { 317 rw_exit(&zap->zap_rwlock); 318 rw_destroy(&zap->zap_rwlock); 319 if (!zap->zap_ismicro) 320 mutex_destroy(&zap->zap_f.zap_num_entries_mtx); 321 kmem_free(zap, sizeof (zap_t)); 322 return (winner); 323 } 324 325 if (zap->zap_ismicro) { 326 zap->zap_salt = zap->zap_m.zap_phys->mz_salt; 327 zap->zap_normflags = zap->zap_m.zap_phys->mz_normflags; 328 zap->zap_m.zap_num_chunks = db->db_size / MZAP_ENT_LEN - 1; 329 avl_create(&zap->zap_m.zap_avl, mze_compare, 330 sizeof (mzap_ent_t), offsetof(mzap_ent_t, mze_node)); 331 332 for (i = 0; i < zap->zap_m.zap_num_chunks; i++) { 333 mzap_ent_phys_t *mze = 334 &zap->zap_m.zap_phys->mz_chunk[i]; 335 if (mze->mze_name[0]) { 336 zap_name_t *zn; 337 338 zn = zap_name_alloc(zap, mze->mze_name, 339 MT_EXACT); 340 if (mze_insert(zap, i, zn->zn_hash, mze) == 0) 341 zap->zap_m.zap_num_entries++; 342 else { 343 printf("ZFS WARNING: Duplicated ZAP " 344 "entry detected (%s).\n", 345 mze->mze_name); 346 } 347 zap_name_free(zn); 348 } 349 } 350 } else { 351 zap->zap_salt = zap->zap_f.zap_phys->zap_salt; 352 zap->zap_normflags = zap->zap_f.zap_phys->zap_normflags; 353 354 ASSERT3U(sizeof (struct zap_leaf_header), ==, 355 2*ZAP_LEAF_CHUNKSIZE); 356 357 /* 358 * The embedded pointer table should not overlap the 359 * other members. 360 */ 361 ASSERT3P(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), >, 362 &zap->zap_f.zap_phys->zap_salt); 363 364 /* 365 * The embedded pointer table should end at the end of 366 * the block 367 */ 368 ASSERT3U((uintptr_t)&ZAP_EMBEDDED_PTRTBL_ENT(zap, 369 1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)) - 370 (uintptr_t)zap->zap_f.zap_phys, ==, 371 zap->zap_dbuf->db_size); 372 } 373 rw_exit(&zap->zap_rwlock); 374 return (zap); 375} 376 377int 378zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx, 379 krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp) 380{ 381 zap_t *zap; 382 dmu_buf_t *db; 383 krw_t lt; 384 int err; 385 386 *zapp = NULL; 387 388 err = dmu_buf_hold(os, obj, 0, NULL, &db); 389 if (err) 390 return (err); 391 392#ifdef ZFS_DEBUG 393 { 394 dmu_object_info_t doi; 395 dmu_object_info_from_db(db, &doi); 396 ASSERT(dmu_ot[doi.doi_type].ot_byteswap == zap_byteswap); 397 } 398#endif 399 400 zap = dmu_buf_get_user(db); 401 if (zap == NULL) 402 zap = mzap_open(os, obj, db); 403 404 /* 405 * We're checking zap_ismicro without the lock held, in order to 406 * tell what type of lock we want. Once we have some sort of 407 * lock, see if it really is the right type. In practice this 408 * can only be different if it was upgraded from micro to fat, 409 * and micro wanted WRITER but fat only needs READER. 410 */ 411 lt = (!zap->zap_ismicro && fatreader) ? RW_READER : lti; 412 rw_enter(&zap->zap_rwlock, lt); 413 if (lt != ((!zap->zap_ismicro && fatreader) ? RW_READER : lti)) { 414 /* it was upgraded, now we only need reader */ 415 ASSERT(lt == RW_WRITER); 416 ASSERT(RW_READER == 417 (!zap->zap_ismicro && fatreader) ? RW_READER : lti); 418 rw_downgrade(&zap->zap_rwlock); 419 lt = RW_READER; 420 } 421 422 zap->zap_objset = os; 423 424 if (lt == RW_WRITER) 425 dmu_buf_will_dirty(db, tx); 426 427 ASSERT3P(zap->zap_dbuf, ==, db); 428 429 ASSERT(!zap->zap_ismicro || 430 zap->zap_m.zap_num_entries <= zap->zap_m.zap_num_chunks); 431 if (zap->zap_ismicro && tx && adding && 432 zap->zap_m.zap_num_entries == zap->zap_m.zap_num_chunks) { 433 uint64_t newsz = db->db_size + SPA_MINBLOCKSIZE; 434 if (newsz > MZAP_MAX_BLKSZ) { 435 dprintf("upgrading obj %llu: num_entries=%u\n", 436 obj, zap->zap_m.zap_num_entries); 437 *zapp = zap; 438 return (mzap_upgrade(zapp, tx)); 439 } 440 err = dmu_object_set_blocksize(os, obj, newsz, 0, tx); 441 ASSERT3U(err, ==, 0); 442 zap->zap_m.zap_num_chunks = 443 db->db_size / MZAP_ENT_LEN - 1; 444 } 445 446 *zapp = zap; 447 return (0); 448} 449 450void 451zap_unlockdir(zap_t *zap) 452{ 453 rw_exit(&zap->zap_rwlock); 454 dmu_buf_rele(zap->zap_dbuf, NULL); 455} 456 457static int 458mzap_upgrade(zap_t **zapp, dmu_tx_t *tx) 459{ 460 mzap_phys_t *mzp; 461 int i, sz, nchunks, err; 462 zap_t *zap = *zapp; 463 464 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 465 466 sz = zap->zap_dbuf->db_size; 467 mzp = kmem_alloc(sz, KM_SLEEP); 468 bcopy(zap->zap_dbuf->db_data, mzp, sz); 469 nchunks = zap->zap_m.zap_num_chunks; 470 471 err = dmu_object_set_blocksize(zap->zap_objset, zap->zap_object, 472 1ULL << fzap_default_block_shift, 0, tx); 473 if (err) { 474 kmem_free(mzp, sz); 475 return (err); 476 } 477 478 dprintf("upgrading obj=%llu with %u chunks\n", 479 zap->zap_object, nchunks); 480 /* XXX destroy the avl later, so we can use the stored hash value */ 481 mze_destroy(zap); 482 483 fzap_upgrade(zap, tx); 484 485 for (i = 0; i < nchunks; i++) { 486 int err; 487 mzap_ent_phys_t *mze = &mzp->mz_chunk[i]; 488 zap_name_t *zn; 489 if (mze->mze_name[0] == 0) 490 continue; 491 dprintf("adding %s=%llu\n", 492 mze->mze_name, mze->mze_value); 493 zn = zap_name_alloc(zap, mze->mze_name, MT_EXACT); 494 err = fzap_add_cd(zn, 8, 1, &mze->mze_value, mze->mze_cd, tx); 495 zap = zn->zn_zap; /* fzap_add_cd() may change zap */ 496 zap_name_free(zn); 497 if (err) 498 break; 499 } 500 kmem_free(mzp, sz); 501 *zapp = zap; 502 return (err); 503} 504 505static void 506mzap_create_impl(objset_t *os, uint64_t obj, int normflags, dmu_tx_t *tx) 507{ 508 dmu_buf_t *db; 509 mzap_phys_t *zp; 510 511 VERIFY(0 == dmu_buf_hold(os, obj, 0, FTAG, &db)); 512 513#ifdef ZFS_DEBUG 514 { 515 dmu_object_info_t doi; 516 dmu_object_info_from_db(db, &doi); 517 ASSERT(dmu_ot[doi.doi_type].ot_byteswap == zap_byteswap); 518 } 519#endif 520 521 dmu_buf_will_dirty(db, tx); 522 zp = db->db_data; 523 zp->mz_block_type = ZBT_MICRO; 524 zp->mz_salt = ((uintptr_t)db ^ (uintptr_t)tx ^ (obj << 1)) | 1ULL; 525 zp->mz_normflags = normflags; 526 dmu_buf_rele(db, FTAG); 527} 528 529int 530zap_create_claim(objset_t *os, uint64_t obj, dmu_object_type_t ot, 531 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 532{ 533 return (zap_create_claim_norm(os, obj, 534 0, ot, bonustype, bonuslen, tx)); 535} 536 537int 538zap_create_claim_norm(objset_t *os, uint64_t obj, int normflags, 539 dmu_object_type_t ot, 540 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 541{ 542 int err; 543 544 err = dmu_object_claim(os, obj, ot, 0, bonustype, bonuslen, tx); 545 if (err != 0) 546 return (err); 547 mzap_create_impl(os, obj, normflags, tx); 548 return (0); 549} 550 551uint64_t 552zap_create(objset_t *os, dmu_object_type_t ot, 553 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 554{ 555 return (zap_create_norm(os, 0, ot, bonustype, bonuslen, tx)); 556} 557 558uint64_t 559zap_create_norm(objset_t *os, int normflags, dmu_object_type_t ot, 560 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 561{ 562 uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx); 563 564 mzap_create_impl(os, obj, normflags, tx); 565 return (obj); 566} 567 568int 569zap_destroy(objset_t *os, uint64_t zapobj, dmu_tx_t *tx) 570{ 571 /* 572 * dmu_object_free will free the object number and free the 573 * data. Freeing the data will cause our pageout function to be 574 * called, which will destroy our data (zap_leaf_t's and zap_t). 575 */ 576 577 return (dmu_object_free(os, zapobj, tx)); 578} 579 580_NOTE(ARGSUSED(0)) 581void 582zap_evict(dmu_buf_t *db, void *vzap) 583{ 584 zap_t *zap = vzap; 585 586 rw_destroy(&zap->zap_rwlock); 587 588 if (zap->zap_ismicro) 589 mze_destroy(zap); 590 else 591 mutex_destroy(&zap->zap_f.zap_num_entries_mtx); 592 593 kmem_free(zap, sizeof (zap_t)); 594} 595 596int 597zap_count(objset_t *os, uint64_t zapobj, uint64_t *count) 598{ 599 zap_t *zap; 600 int err; 601 602 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap); 603 if (err) 604 return (err); 605 if (!zap->zap_ismicro) { 606 err = fzap_count(zap, count); 607 } else { 608 *count = zap->zap_m.zap_num_entries; 609 } 610 zap_unlockdir(zap); 611 return (err); 612} 613 614/* 615 * zn may be NULL; if not specified, it will be computed if needed. 616 * See also the comment above zap_entry_normalization_conflict(). 617 */ 618static boolean_t 619mzap_normalization_conflict(zap_t *zap, zap_name_t *zn, mzap_ent_t *mze) 620{ 621 mzap_ent_t *other; 622 int direction = AVL_BEFORE; 623 boolean_t allocdzn = B_FALSE; 624 625 if (zap->zap_normflags == 0) 626 return (B_FALSE); 627 628again: 629 for (other = avl_walk(&zap->zap_m.zap_avl, mze, direction); 630 other && other->mze_hash == mze->mze_hash; 631 other = avl_walk(&zap->zap_m.zap_avl, other, direction)) { 632 633 if (zn == NULL) { 634 zn = zap_name_alloc(zap, mze->mze_phys.mze_name, 635 MT_FIRST); 636 allocdzn = B_TRUE; 637 } 638 if (zap_match(zn, other->mze_phys.mze_name)) { 639 if (allocdzn) 640 zap_name_free(zn); 641 return (B_TRUE); 642 } 643 } 644 645 if (direction == AVL_BEFORE) { 646 direction = AVL_AFTER; 647 goto again; 648 } 649 650 if (allocdzn) 651 zap_name_free(zn); 652 return (B_FALSE); 653} 654 655/* 656 * Routines for manipulating attributes. 657 */ 658 659int 660zap_lookup(objset_t *os, uint64_t zapobj, const char *name, 661 uint64_t integer_size, uint64_t num_integers, void *buf) 662{ 663 return (zap_lookup_norm(os, zapobj, name, integer_size, 664 num_integers, buf, MT_EXACT, NULL, 0, NULL)); 665} 666 667int 668zap_lookup_norm(objset_t *os, uint64_t zapobj, const char *name, 669 uint64_t integer_size, uint64_t num_integers, void *buf, 670 matchtype_t mt, char *realname, int rn_len, 671 boolean_t *ncp) 672{ 673 zap_t *zap; 674 int err; 675 mzap_ent_t *mze; 676 zap_name_t *zn; 677 678 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap); 679 if (err) 680 return (err); 681 zn = zap_name_alloc(zap, name, mt); 682 if (zn == NULL) { 683 zap_unlockdir(zap); 684 return (ENOTSUP); 685 } 686 687 if (!zap->zap_ismicro) { 688 err = fzap_lookup(zn, integer_size, num_integers, buf, 689 realname, rn_len, ncp); 690 } else { 691 mze = mze_find(zn); 692 if (mze == NULL) { 693 err = ENOENT; 694 } else { 695 if (num_integers < 1) { 696 err = EOVERFLOW; 697 } else if (integer_size != 8) { 698 err = EINVAL; 699 } else { 700 *(uint64_t *)buf = mze->mze_phys.mze_value; 701 (void) strlcpy(realname, 702 mze->mze_phys.mze_name, rn_len); 703 if (ncp) { 704 *ncp = mzap_normalization_conflict(zap, 705 zn, mze); 706 } 707 } 708 } 709 } 710 zap_name_free(zn); 711 zap_unlockdir(zap); 712 return (err); 713} 714 715int 716zap_length(objset_t *os, uint64_t zapobj, const char *name, 717 uint64_t *integer_size, uint64_t *num_integers) 718{ 719 zap_t *zap; 720 int err; 721 mzap_ent_t *mze; 722 zap_name_t *zn; 723 724 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap); 725 if (err) 726 return (err); 727 zn = zap_name_alloc(zap, name, MT_EXACT); 728 if (zn == NULL) { 729 zap_unlockdir(zap); 730 return (ENOTSUP); 731 } 732 if (!zap->zap_ismicro) { 733 err = fzap_length(zn, integer_size, num_integers); 734 } else { 735 mze = mze_find(zn); 736 if (mze == NULL) { 737 err = ENOENT; 738 } else { 739 if (integer_size) 740 *integer_size = 8; 741 if (num_integers) 742 *num_integers = 1; 743 } 744 } 745 zap_name_free(zn); 746 zap_unlockdir(zap); 747 return (err); 748} 749 750static void 751mzap_addent(zap_name_t *zn, uint64_t value) 752{ 753 int i; 754 zap_t *zap = zn->zn_zap; 755 int start = zap->zap_m.zap_alloc_next; 756 uint32_t cd; 757 758 dprintf("obj=%llu %s=%llu\n", zap->zap_object, 759 zn->zn_name_orij, value); 760 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); 761 762#ifdef ZFS_DEBUG 763 for (i = 0; i < zap->zap_m.zap_num_chunks; i++) { 764 mzap_ent_phys_t *mze = &zap->zap_m.zap_phys->mz_chunk[i]; 765 ASSERT(strcmp(zn->zn_name_orij, mze->mze_name) != 0); 766 } 767#endif 768 769 cd = mze_find_unused_cd(zap, zn->zn_hash); 770 /* given the limited size of the microzap, this can't happen */ 771 ASSERT(cd != ZAP_MAXCD); 772 773again: 774 for (i = start; i < zap->zap_m.zap_num_chunks; i++) { 775 mzap_ent_phys_t *mze = &zap->zap_m.zap_phys->mz_chunk[i]; 776 if (mze->mze_name[0] == 0) { 777 mze->mze_value = value; 778 mze->mze_cd = cd; 779 (void) strcpy(mze->mze_name, zn->zn_name_orij); 780 zap->zap_m.zap_num_entries++; 781 zap->zap_m.zap_alloc_next = i+1; 782 if (zap->zap_m.zap_alloc_next == 783 zap->zap_m.zap_num_chunks) 784 zap->zap_m.zap_alloc_next = 0; 785 VERIFY(0 == mze_insert(zap, i, zn->zn_hash, mze)); 786 return; 787 } 788 } 789 if (start != 0) { 790 start = 0; 791 goto again; 792 } 793 ASSERT(!"out of entries!"); 794} 795 796int 797zap_add(objset_t *os, uint64_t zapobj, const char *name, 798 int integer_size, uint64_t num_integers, 799 const void *val, dmu_tx_t *tx) 800{ 801 zap_t *zap; 802 int err; 803 mzap_ent_t *mze; 804 const uint64_t *intval = val; 805 zap_name_t *zn; 806 807 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, &zap); 808 if (err) 809 return (err); 810 zn = zap_name_alloc(zap, name, MT_EXACT); 811 if (zn == NULL) { 812 zap_unlockdir(zap); 813 return (ENOTSUP); 814 } 815 if (!zap->zap_ismicro) { 816 err = fzap_add(zn, integer_size, num_integers, val, tx); 817 zap = zn->zn_zap; /* fzap_add() may change zap */ 818 } else if (integer_size != 8 || num_integers != 1 || 819 strlen(name) >= MZAP_NAME_LEN) { 820 dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n", 821 zapobj, integer_size, num_integers, name); 822 err = mzap_upgrade(&zn->zn_zap, tx); 823 if (err == 0) 824 err = fzap_add(zn, integer_size, num_integers, val, tx); 825 zap = zn->zn_zap; /* fzap_add() may change zap */ 826 } else { 827 mze = mze_find(zn); 828 if (mze != NULL) { 829 err = EEXIST; 830 } else { 831 mzap_addent(zn, *intval); 832 } 833 } 834 ASSERT(zap == zn->zn_zap); 835 zap_name_free(zn); 836 if (zap != NULL) /* may be NULL if fzap_add() failed */ 837 zap_unlockdir(zap); 838 return (err); 839} 840 841int 842zap_update(objset_t *os, uint64_t zapobj, const char *name, 843 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx) 844{ 845 zap_t *zap; 846 mzap_ent_t *mze; 847 const uint64_t *intval = val; 848 zap_name_t *zn; 849 int err; 850 851 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, &zap); 852 if (err) 853 return (err); 854 zn = zap_name_alloc(zap, name, MT_EXACT); 855 if (zn == NULL) { 856 zap_unlockdir(zap); 857 return (ENOTSUP); 858 } 859 if (!zap->zap_ismicro) { 860 err = fzap_update(zn, integer_size, num_integers, val, tx); 861 zap = zn->zn_zap; /* fzap_update() may change zap */ 862 } else if (integer_size != 8 || num_integers != 1 || 863 strlen(name) >= MZAP_NAME_LEN) { 864 dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n", 865 zapobj, integer_size, num_integers, name); 866 err = mzap_upgrade(&zn->zn_zap, tx); 867 if (err == 0) 868 err = fzap_update(zn, integer_size, num_integers, 869 val, tx); 870 zap = zn->zn_zap; /* fzap_update() may change zap */ 871 } else { 872 mze = mze_find(zn); 873 if (mze != NULL) { 874 mze->mze_phys.mze_value = *intval; 875 zap->zap_m.zap_phys->mz_chunk 876 [mze->mze_chunkid].mze_value = *intval; 877 } else { 878 mzap_addent(zn, *intval); 879 } 880 } 881 ASSERT(zap == zn->zn_zap); 882 zap_name_free(zn); 883 if (zap != NULL) /* may be NULL if fzap_upgrade() failed */ 884 zap_unlockdir(zap); 885 return (err); 886} 887 888int 889zap_remove(objset_t *os, uint64_t zapobj, const char *name, dmu_tx_t *tx) 890{ 891 return (zap_remove_norm(os, zapobj, name, MT_EXACT, tx)); 892} 893 894int 895zap_remove_norm(objset_t *os, uint64_t zapobj, const char *name, 896 matchtype_t mt, dmu_tx_t *tx) 897{ 898 zap_t *zap; 899 int err; 900 mzap_ent_t *mze; 901 zap_name_t *zn; 902 903 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, &zap); 904 if (err) 905 return (err); 906 zn = zap_name_alloc(zap, name, mt); 907 if (zn == NULL) { 908 zap_unlockdir(zap); 909 return (ENOTSUP); 910 } 911 if (!zap->zap_ismicro) { 912 err = fzap_remove(zn, tx); 913 } else { 914 mze = mze_find(zn); 915 if (mze == NULL) { 916 err = ENOENT; 917 } else { 918 zap->zap_m.zap_num_entries--; 919 bzero(&zap->zap_m.zap_phys->mz_chunk[mze->mze_chunkid], 920 sizeof (mzap_ent_phys_t)); 921 mze_remove(zap, mze); 922 } 923 } 924 zap_name_free(zn); 925 zap_unlockdir(zap); 926 return (err); 927} 928 929/* 930 * Routines for iterating over the attributes. 931 */ 932 933/* 934 * We want to keep the high 32 bits of the cursor zero if we can, so 935 * that 32-bit programs can access this. So use a small hash value so 936 * we can fit 4 bits of cd into the 32-bit cursor. 937 * 938 * [ 4 zero bits | 32-bit collision differentiator | 28-bit hash value ] 939 */ 940void 941zap_cursor_init_serialized(zap_cursor_t *zc, objset_t *os, uint64_t zapobj, 942 uint64_t serialized) 943{ 944 zc->zc_objset = os; 945 zc->zc_zap = NULL; 946 zc->zc_leaf = NULL; 947 zc->zc_zapobj = zapobj; 948 if (serialized == -1ULL) { 949 zc->zc_hash = -1ULL; 950 zc->zc_cd = 0; 951 } else { 952 zc->zc_hash = serialized << (64-ZAP_HASHBITS); 953 zc->zc_cd = serialized >> ZAP_HASHBITS; 954 if (zc->zc_cd >= ZAP_MAXCD) /* corrupt serialized */ 955 zc->zc_cd = 0; 956 } 957} 958 959void 960zap_cursor_init(zap_cursor_t *zc, objset_t *os, uint64_t zapobj) 961{ 962 zap_cursor_init_serialized(zc, os, zapobj, 0); 963} 964 965void 966zap_cursor_fini(zap_cursor_t *zc) 967{ 968 if (zc->zc_zap) { 969 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER); 970 zap_unlockdir(zc->zc_zap); 971 zc->zc_zap = NULL; 972 } 973 if (zc->zc_leaf) { 974 rw_enter(&zc->zc_leaf->l_rwlock, RW_READER); 975 zap_put_leaf(zc->zc_leaf); 976 zc->zc_leaf = NULL; 977 } 978 zc->zc_objset = NULL; 979} 980 981uint64_t 982zap_cursor_serialize(zap_cursor_t *zc) 983{ 984 if (zc->zc_hash == -1ULL) 985 return (-1ULL); 986 ASSERT((zc->zc_hash & (ZAP_MAXCD-1)) == 0); 987 ASSERT(zc->zc_cd < ZAP_MAXCD); 988 return ((zc->zc_hash >> (64-ZAP_HASHBITS)) | 989 ((uint64_t)zc->zc_cd << ZAP_HASHBITS)); 990} 991 992int 993zap_cursor_retrieve(zap_cursor_t *zc, zap_attribute_t *za) 994{ 995 int err; 996 avl_index_t idx; 997 mzap_ent_t mze_tofind; 998 mzap_ent_t *mze; 999 1000 if (zc->zc_hash == -1ULL) 1001 return (ENOENT); 1002 1003 if (zc->zc_zap == NULL) { 1004 err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL, 1005 RW_READER, TRUE, FALSE, &zc->zc_zap); 1006 if (err) 1007 return (err); 1008 } else { 1009 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER); 1010 } 1011 if (!zc->zc_zap->zap_ismicro) { 1012 err = fzap_cursor_retrieve(zc->zc_zap, zc, za); 1013 } else { 1014 err = ENOENT; 1015 1016 mze_tofind.mze_hash = zc->zc_hash; 1017 mze_tofind.mze_phys.mze_cd = zc->zc_cd; 1018 1019 mze = avl_find(&zc->zc_zap->zap_m.zap_avl, &mze_tofind, &idx); 1020 if (mze == NULL) { 1021 mze = avl_nearest(&zc->zc_zap->zap_m.zap_avl, 1022 idx, AVL_AFTER); 1023 } 1024 if (mze) { 1025 ASSERT(0 == bcmp(&mze->mze_phys, 1026 &zc->zc_zap->zap_m.zap_phys->mz_chunk 1027 [mze->mze_chunkid], sizeof (mze->mze_phys))); 1028 1029 za->za_normalization_conflict = 1030 mzap_normalization_conflict(zc->zc_zap, NULL, mze); 1031 za->za_integer_length = 8; 1032 za->za_num_integers = 1; 1033 za->za_first_integer = mze->mze_phys.mze_value; 1034 (void) strcpy(za->za_name, mze->mze_phys.mze_name); 1035 zc->zc_hash = mze->mze_hash; 1036 zc->zc_cd = mze->mze_phys.mze_cd; 1037 err = 0; 1038 } else { 1039 zc->zc_hash = -1ULL; 1040 } 1041 } 1042 rw_exit(&zc->zc_zap->zap_rwlock); 1043 return (err); 1044} 1045 1046void 1047zap_cursor_advance(zap_cursor_t *zc) 1048{ 1049 if (zc->zc_hash == -1ULL) 1050 return; 1051 zc->zc_cd++; 1052 if (zc->zc_cd >= ZAP_MAXCD) { 1053 zc->zc_cd = 0; 1054 zc->zc_hash += 1ULL<<(64-ZAP_HASHBITS); 1055 if (zc->zc_hash == 0) /* EOF */ 1056 zc->zc_hash = -1ULL; 1057 } 1058} 1059 1060int 1061zap_get_stats(objset_t *os, uint64_t zapobj, zap_stats_t *zs) 1062{ 1063 int err; 1064 zap_t *zap; 1065 1066 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap); 1067 if (err) 1068 return (err); 1069 1070 bzero(zs, sizeof (zap_stats_t)); 1071 1072 if (zap->zap_ismicro) { 1073 zs->zs_blocksize = zap->zap_dbuf->db_size; 1074 zs->zs_num_entries = zap->zap_m.zap_num_entries; 1075 zs->zs_num_blocks = 1; 1076 } else { 1077 fzap_get_stats(zap, zs); 1078 } 1079 zap_unlockdir(zap); 1080 return (0); 1081} 1082