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.
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.
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]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012 by Delphix. All rights reserved.
29 #include <sys/zfs_context.h>
31 #include <sys/refcount.h>
32 #include <sys/zap_impl.h>
33 #include <sys/zap_leaf.h>
38 #include <sys/sunddi.h>
41 static int mzap_upgrade(zap_t **zapp, dmu_tx_t *tx, zap_flags_t flags);
44 zap_getflags(zap_t *zap)
48 return (zap->zap_u.zap_fat.zap_phys->zap_flags);
52 zap_hashbits(zap_t *zap)
54 if (zap_getflags(zap) & ZAP_FLAG_HASH64)
63 if (zap_getflags(zap) & ZAP_FLAG_HASH64)
70 zap_hash(zap_name_t *zn)
72 zap_t *zap = zn->zn_zap;
75 if (zap_getflags(zap) & ZAP_FLAG_PRE_HASHED_KEY) {
76 ASSERT(zap_getflags(zap) & ZAP_FLAG_UINT64_KEY);
77 h = *(uint64_t *)zn->zn_key_orig;
81 ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY);
83 if (zap_getflags(zap) & ZAP_FLAG_UINT64_KEY) {
85 const uint64_t *wp = zn->zn_key_norm;
87 ASSERT(zn->zn_key_intlen == 8);
88 for (i = 0; i < zn->zn_key_norm_numints; wp++, i++) {
92 for (j = 0; j < zn->zn_key_intlen; j++) {
94 zfs_crc64_table[(h ^ word) & 0xFF];
100 const uint8_t *cp = zn->zn_key_norm;
103 * We previously stored the terminating null on
104 * disk, but didn't hash it, so we need to
105 * continue to not hash it. (The
106 * zn_key_*_numints includes the terminating
107 * null for non-binary keys.)
109 len = zn->zn_key_norm_numints - 1;
111 ASSERT(zn->zn_key_intlen == 1);
112 for (i = 0; i < len; cp++, i++) {
114 zfs_crc64_table[(h ^ *cp) & 0xFF];
119 * Don't use all 64 bits, since we need some in the cookie for
120 * the collision differentiator. We MUST use the high bits,
121 * since those are the ones that we first pay attention to when
122 * chosing the bucket.
124 h &= ~((1ULL << (64 - zap_hashbits(zap))) - 1);
130 zap_normalize(zap_t *zap, const char *name, char *namenorm)
132 size_t inlen, outlen;
135 ASSERT(!(zap_getflags(zap) & ZAP_FLAG_UINT64_KEY));
137 inlen = strlen(name) + 1;
138 outlen = ZAP_MAXNAMELEN;
141 (void) u8_textprep_str((char *)name, &inlen, namenorm, &outlen,
142 zap->zap_normflags | U8_TEXTPREP_IGNORE_NULL |
143 U8_TEXTPREP_IGNORE_INVALID, U8_UNICODE_LATEST, &err);
149 zap_match(zap_name_t *zn, const char *matchname)
151 ASSERT(!(zap_getflags(zn->zn_zap) & ZAP_FLAG_UINT64_KEY));
153 if (zn->zn_matchtype == MT_FIRST) {
154 char norm[ZAP_MAXNAMELEN];
156 if (zap_normalize(zn->zn_zap, matchname, norm) != 0)
159 return (strcmp(zn->zn_key_norm, norm) == 0);
161 /* MT_BEST or MT_EXACT */
162 return (strcmp(zn->zn_key_orig, matchname) == 0);
167 zap_name_free(zap_name_t *zn)
169 kmem_free(zn, sizeof (zap_name_t));
173 zap_name_alloc(zap_t *zap, const char *key, matchtype_t mt)
175 zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_PUSHPAGE);
178 zn->zn_key_intlen = sizeof (*key);
179 zn->zn_key_orig = key;
180 zn->zn_key_orig_numints = strlen(zn->zn_key_orig) + 1;
181 zn->zn_matchtype = mt;
182 if (zap->zap_normflags) {
183 if (zap_normalize(zap, key, zn->zn_normbuf) != 0) {
187 zn->zn_key_norm = zn->zn_normbuf;
188 zn->zn_key_norm_numints = strlen(zn->zn_key_norm) + 1;
190 if (mt != MT_EXACT) {
194 zn->zn_key_norm = zn->zn_key_orig;
195 zn->zn_key_norm_numints = zn->zn_key_orig_numints;
198 zn->zn_hash = zap_hash(zn);
203 zap_name_alloc_uint64(zap_t *zap, const uint64_t *key, int numints)
205 zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_PUSHPAGE);
207 ASSERT(zap->zap_normflags == 0);
209 zn->zn_key_intlen = sizeof (*key);
210 zn->zn_key_orig = zn->zn_key_norm = key;
211 zn->zn_key_orig_numints = zn->zn_key_norm_numints = numints;
212 zn->zn_matchtype = MT_EXACT;
214 zn->zn_hash = zap_hash(zn);
219 mzap_byteswap(mzap_phys_t *buf, size_t size)
222 buf->mz_block_type = BSWAP_64(buf->mz_block_type);
223 buf->mz_salt = BSWAP_64(buf->mz_salt);
224 buf->mz_normflags = BSWAP_64(buf->mz_normflags);
225 max = (size / MZAP_ENT_LEN) - 1;
226 for (i = 0; i < max; i++) {
227 buf->mz_chunk[i].mze_value =
228 BSWAP_64(buf->mz_chunk[i].mze_value);
229 buf->mz_chunk[i].mze_cd =
230 BSWAP_32(buf->mz_chunk[i].mze_cd);
235 zap_byteswap(void *buf, size_t size)
239 block_type = *(uint64_t *)buf;
241 if (block_type == ZBT_MICRO || block_type == BSWAP_64(ZBT_MICRO)) {
242 /* ASSERT(magic == ZAP_LEAF_MAGIC); */
243 mzap_byteswap(buf, size);
245 fzap_byteswap(buf, size);
250 mze_compare(const void *arg1, const void *arg2)
252 const mzap_ent_t *mze1 = arg1;
253 const mzap_ent_t *mze2 = arg2;
255 if (mze1->mze_hash > mze2->mze_hash)
257 if (mze1->mze_hash < mze2->mze_hash)
259 if (mze1->mze_cd > mze2->mze_cd)
261 if (mze1->mze_cd < mze2->mze_cd)
267 mze_insert(zap_t *zap, int chunkid, uint64_t hash)
271 ASSERT(zap->zap_ismicro);
272 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
274 mze = kmem_alloc(sizeof (mzap_ent_t), KM_PUSHPAGE);
275 mze->mze_chunkid = chunkid;
276 mze->mze_hash = hash;
277 mze->mze_cd = MZE_PHYS(zap, mze)->mze_cd;
278 ASSERT(MZE_PHYS(zap, mze)->mze_name[0] != 0);
279 avl_add(&zap->zap_m.zap_avl, mze);
283 mze_find(zap_name_t *zn)
285 mzap_ent_t mze_tofind;
288 avl_tree_t *avl = &zn->zn_zap->zap_m.zap_avl;
290 ASSERT(zn->zn_zap->zap_ismicro);
291 ASSERT(RW_LOCK_HELD(&zn->zn_zap->zap_rwlock));
293 mze_tofind.mze_hash = zn->zn_hash;
294 mze_tofind.mze_cd = 0;
297 mze = avl_find(avl, &mze_tofind, &idx);
299 mze = avl_nearest(avl, idx, AVL_AFTER);
300 for (; mze && mze->mze_hash == zn->zn_hash; mze = AVL_NEXT(avl, mze)) {
301 ASSERT3U(mze->mze_cd, ==, MZE_PHYS(zn->zn_zap, mze)->mze_cd);
302 if (zap_match(zn, MZE_PHYS(zn->zn_zap, mze)->mze_name))
305 if (zn->zn_matchtype == MT_BEST) {
306 zn->zn_matchtype = MT_FIRST;
313 mze_find_unused_cd(zap_t *zap, uint64_t hash)
315 mzap_ent_t mze_tofind;
318 avl_tree_t *avl = &zap->zap_m.zap_avl;
321 ASSERT(zap->zap_ismicro);
322 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
324 mze_tofind.mze_hash = hash;
325 mze_tofind.mze_cd = 0;
328 for (mze = avl_find(avl, &mze_tofind, &idx);
329 mze && mze->mze_hash == hash; mze = AVL_NEXT(avl, mze)) {
330 if (mze->mze_cd != cd)
339 mze_remove(zap_t *zap, mzap_ent_t *mze)
341 ASSERT(zap->zap_ismicro);
342 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
344 avl_remove(&zap->zap_m.zap_avl, mze);
345 kmem_free(mze, sizeof (mzap_ent_t));
349 mze_destroy(zap_t *zap)
352 void *avlcookie = NULL;
354 while ((mze = avl_destroy_nodes(&zap->zap_m.zap_avl, &avlcookie)))
355 kmem_free(mze, sizeof (mzap_ent_t));
356 avl_destroy(&zap->zap_m.zap_avl);
360 mzap_open(objset_t *os, uint64_t obj, dmu_buf_t *db)
366 ASSERT3U(MZAP_ENT_LEN, ==, sizeof (mzap_ent_phys_t));
368 zap = kmem_zalloc(sizeof (zap_t), KM_PUSHPAGE);
369 rw_init(&zap->zap_rwlock, NULL, RW_DEFAULT, NULL);
370 rw_enter(&zap->zap_rwlock, RW_WRITER);
371 zap->zap_objset = os;
372 zap->zap_object = obj;
375 if (*(uint64_t *)db->db_data != ZBT_MICRO) {
376 mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, 0, 0);
377 zap->zap_f.zap_block_shift = highbit(db->db_size) - 1;
379 zap->zap_ismicro = TRUE;
383 * Make sure that zap_ismicro is set before we let others see
384 * it, because zap_lockdir() checks zap_ismicro without the lock
387 winner = dmu_buf_set_user(db, zap, &zap->zap_m.zap_phys, zap_evict);
389 if (winner != NULL) {
390 rw_exit(&zap->zap_rwlock);
391 rw_destroy(&zap->zap_rwlock);
392 if (!zap->zap_ismicro)
393 mutex_destroy(&zap->zap_f.zap_num_entries_mtx);
394 kmem_free(zap, sizeof (zap_t));
398 if (zap->zap_ismicro) {
399 zap->zap_salt = zap->zap_m.zap_phys->mz_salt;
400 zap->zap_normflags = zap->zap_m.zap_phys->mz_normflags;
401 zap->zap_m.zap_num_chunks = db->db_size / MZAP_ENT_LEN - 1;
402 avl_create(&zap->zap_m.zap_avl, mze_compare,
403 sizeof (mzap_ent_t), offsetof(mzap_ent_t, mze_node));
405 for (i = 0; i < zap->zap_m.zap_num_chunks; i++) {
406 mzap_ent_phys_t *mze =
407 &zap->zap_m.zap_phys->mz_chunk[i];
408 if (mze->mze_name[0]) {
411 zap->zap_m.zap_num_entries++;
412 zn = zap_name_alloc(zap, mze->mze_name,
414 mze_insert(zap, i, zn->zn_hash);
419 zap->zap_salt = zap->zap_f.zap_phys->zap_salt;
420 zap->zap_normflags = zap->zap_f.zap_phys->zap_normflags;
422 ASSERT3U(sizeof (struct zap_leaf_header), ==,
423 2*ZAP_LEAF_CHUNKSIZE);
426 * The embedded pointer table should not overlap the
429 ASSERT3P(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), >,
430 &zap->zap_f.zap_phys->zap_salt);
433 * The embedded pointer table should end at the end of
436 ASSERT3U((uintptr_t)&ZAP_EMBEDDED_PTRTBL_ENT(zap,
437 1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)) -
438 (uintptr_t)zap->zap_f.zap_phys, ==,
439 zap->zap_dbuf->db_size);
441 rw_exit(&zap->zap_rwlock);
446 zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx,
447 krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp)
456 err = dmu_buf_hold(os, obj, 0, NULL, &db, DMU_READ_NO_PREFETCH);
462 dmu_object_info_t doi;
463 dmu_object_info_from_db(db, &doi);
464 ASSERT3U(DMU_OT_BYTESWAP(doi.doi_type), ==, DMU_BSWAP_ZAP);
468 zap = dmu_buf_get_user(db);
470 zap = mzap_open(os, obj, db);
473 * We're checking zap_ismicro without the lock held, in order to
474 * tell what type of lock we want. Once we have some sort of
475 * lock, see if it really is the right type. In practice this
476 * can only be different if it was upgraded from micro to fat,
477 * and micro wanted WRITER but fat only needs READER.
479 lt = (!zap->zap_ismicro && fatreader) ? RW_READER : lti;
480 rw_enter(&zap->zap_rwlock, lt);
481 if (lt != ((!zap->zap_ismicro && fatreader) ? RW_READER : lti)) {
482 /* it was upgraded, now we only need reader */
483 ASSERT(lt == RW_WRITER);
485 (!zap->zap_ismicro && fatreader) ? RW_READER : lti);
486 rw_downgrade(&zap->zap_rwlock);
490 zap->zap_objset = os;
493 dmu_buf_will_dirty(db, tx);
495 ASSERT3P(zap->zap_dbuf, ==, db);
497 ASSERT(!zap->zap_ismicro ||
498 zap->zap_m.zap_num_entries <= zap->zap_m.zap_num_chunks);
499 if (zap->zap_ismicro && tx && adding &&
500 zap->zap_m.zap_num_entries == zap->zap_m.zap_num_chunks) {
501 uint64_t newsz = db->db_size + SPA_MINBLOCKSIZE;
502 if (newsz > MZAP_MAX_BLKSZ) {
503 dprintf("upgrading obj %llu: num_entries=%u\n",
504 obj, zap->zap_m.zap_num_entries);
506 return (mzap_upgrade(zapp, tx, 0));
508 err = dmu_object_set_blocksize(os, obj, newsz, 0, tx);
510 zap->zap_m.zap_num_chunks =
511 db->db_size / MZAP_ENT_LEN - 1;
519 zap_unlockdir(zap_t *zap)
521 rw_exit(&zap->zap_rwlock);
522 dmu_buf_rele(zap->zap_dbuf, NULL);
526 mzap_upgrade(zap_t **zapp, dmu_tx_t *tx, zap_flags_t flags)
533 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
535 sz = zap->zap_dbuf->db_size;
536 mzp = kmem_alloc(sz, KM_PUSHPAGE | KM_NODEBUG);
537 bcopy(zap->zap_dbuf->db_data, mzp, sz);
538 nchunks = zap->zap_m.zap_num_chunks;
541 err = dmu_object_set_blocksize(zap->zap_objset, zap->zap_object,
542 1ULL << fzap_default_block_shift, 0, tx);
549 dprintf("upgrading obj=%llu with %u chunks\n",
550 zap->zap_object, nchunks);
551 /* XXX destroy the avl later, so we can use the stored hash value */
554 fzap_upgrade(zap, tx, flags);
556 for (i = 0; i < nchunks; i++) {
557 mzap_ent_phys_t *mze = &mzp->mz_chunk[i];
559 if (mze->mze_name[0] == 0)
561 dprintf("adding %s=%llu\n",
562 mze->mze_name, mze->mze_value);
563 zn = zap_name_alloc(zap, mze->mze_name, MT_EXACT);
564 err = fzap_add_cd(zn, 8, 1, &mze->mze_value, mze->mze_cd, tx);
565 zap = zn->zn_zap; /* fzap_add_cd() may change zap */
576 mzap_create_impl(objset_t *os, uint64_t obj, int normflags, zap_flags_t flags,
582 VERIFY(0 == dmu_buf_hold(os, obj, 0, FTAG, &db, DMU_READ_NO_PREFETCH));
586 dmu_object_info_t doi;
587 dmu_object_info_from_db(db, &doi);
588 ASSERT3U(DMU_OT_BYTESWAP(doi.doi_type), ==, DMU_BSWAP_ZAP);
592 dmu_buf_will_dirty(db, tx);
594 zp->mz_block_type = ZBT_MICRO;
595 zp->mz_salt = ((uintptr_t)db ^ (uintptr_t)tx ^ (obj << 1)) | 1ULL;
596 zp->mz_normflags = normflags;
597 dmu_buf_rele(db, FTAG);
601 /* Only fat zap supports flags; upgrade immediately. */
602 VERIFY(0 == zap_lockdir(os, obj, tx, RW_WRITER,
603 B_FALSE, B_FALSE, &zap));
604 VERIFY3U(0, ==, mzap_upgrade(&zap, tx, flags));
610 zap_create_claim(objset_t *os, uint64_t obj, dmu_object_type_t ot,
611 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
613 return (zap_create_claim_norm(os, obj,
614 0, ot, bonustype, bonuslen, tx));
618 zap_create_claim_norm(objset_t *os, uint64_t obj, int normflags,
619 dmu_object_type_t ot,
620 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
624 err = dmu_object_claim(os, obj, ot, 0, bonustype, bonuslen, tx);
627 mzap_create_impl(os, obj, normflags, 0, tx);
632 zap_create(objset_t *os, dmu_object_type_t ot,
633 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
635 return (zap_create_norm(os, 0, ot, bonustype, bonuslen, tx));
639 zap_create_norm(objset_t *os, int normflags, dmu_object_type_t ot,
640 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
642 uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx);
644 mzap_create_impl(os, obj, normflags, 0, tx);
649 zap_create_flags(objset_t *os, int normflags, zap_flags_t flags,
650 dmu_object_type_t ot, int leaf_blockshift, int indirect_blockshift,
651 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
653 uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx);
655 ASSERT(leaf_blockshift >= SPA_MINBLOCKSHIFT &&
656 leaf_blockshift <= SPA_MAXBLOCKSHIFT &&
657 indirect_blockshift >= SPA_MINBLOCKSHIFT &&
658 indirect_blockshift <= SPA_MAXBLOCKSHIFT);
660 VERIFY(dmu_object_set_blocksize(os, obj,
661 1ULL << leaf_blockshift, indirect_blockshift, tx) == 0);
663 mzap_create_impl(os, obj, normflags, flags, tx);
668 zap_destroy(objset_t *os, uint64_t zapobj, dmu_tx_t *tx)
671 * dmu_object_free will free the object number and free the
672 * data. Freeing the data will cause our pageout function to be
673 * called, which will destroy our data (zap_leaf_t's and zap_t).
676 return (dmu_object_free(os, zapobj, tx));
681 zap_evict(dmu_buf_t *db, void *vzap)
685 rw_destroy(&zap->zap_rwlock);
687 if (zap->zap_ismicro)
690 mutex_destroy(&zap->zap_f.zap_num_entries_mtx);
692 kmem_free(zap, sizeof (zap_t));
696 zap_count(objset_t *os, uint64_t zapobj, uint64_t *count)
701 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
704 if (!zap->zap_ismicro) {
705 err = fzap_count(zap, count);
707 *count = zap->zap_m.zap_num_entries;
714 * zn may be NULL; if not specified, it will be computed if needed.
715 * See also the comment above zap_entry_normalization_conflict().
718 mzap_normalization_conflict(zap_t *zap, zap_name_t *zn, mzap_ent_t *mze)
721 int direction = AVL_BEFORE;
722 boolean_t allocdzn = B_FALSE;
724 if (zap->zap_normflags == 0)
728 for (other = avl_walk(&zap->zap_m.zap_avl, mze, direction);
729 other && other->mze_hash == mze->mze_hash;
730 other = avl_walk(&zap->zap_m.zap_avl, other, direction)) {
733 zn = zap_name_alloc(zap, MZE_PHYS(zap, mze)->mze_name,
737 if (zap_match(zn, MZE_PHYS(zap, other)->mze_name)) {
744 if (direction == AVL_BEFORE) {
745 direction = AVL_AFTER;
755 * Routines for manipulating attributes.
759 zap_lookup(objset_t *os, uint64_t zapobj, const char *name,
760 uint64_t integer_size, uint64_t num_integers, void *buf)
762 return (zap_lookup_norm(os, zapobj, name, integer_size,
763 num_integers, buf, MT_EXACT, NULL, 0, NULL));
767 zap_lookup_norm(objset_t *os, uint64_t zapobj, const char *name,
768 uint64_t integer_size, uint64_t num_integers, void *buf,
769 matchtype_t mt, char *realname, int rn_len,
777 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
780 zn = zap_name_alloc(zap, name, mt);
786 if (!zap->zap_ismicro) {
787 err = fzap_lookup(zn, integer_size, num_integers, buf,
788 realname, rn_len, ncp);
794 if (num_integers < 1) {
796 } else if (integer_size != 8) {
800 MZE_PHYS(zap, mze)->mze_value;
801 (void) strlcpy(realname,
802 MZE_PHYS(zap, mze)->mze_name, rn_len);
804 *ncp = mzap_normalization_conflict(zap,
816 zap_prefetch_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
823 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
826 zn = zap_name_alloc_uint64(zap, key, key_numints);
839 zap_lookup_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
840 int key_numints, uint64_t integer_size, uint64_t num_integers, void *buf)
846 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
849 zn = zap_name_alloc_uint64(zap, key, key_numints);
855 err = fzap_lookup(zn, integer_size, num_integers, buf,
863 zap_contains(objset_t *os, uint64_t zapobj, const char *name)
865 int err = (zap_lookup_norm(os, zapobj, name, 0,
866 0, NULL, MT_EXACT, NULL, 0, NULL));
867 if (err == EOVERFLOW || err == EINVAL)
868 err = 0; /* found, but skipped reading the value */
873 zap_length(objset_t *os, uint64_t zapobj, const char *name,
874 uint64_t *integer_size, uint64_t *num_integers)
881 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
884 zn = zap_name_alloc(zap, name, MT_EXACT);
889 if (!zap->zap_ismicro) {
890 err = fzap_length(zn, integer_size, num_integers);
908 zap_length_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
909 int key_numints, uint64_t *integer_size, uint64_t *num_integers)
915 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
918 zn = zap_name_alloc_uint64(zap, key, key_numints);
923 err = fzap_length(zn, integer_size, num_integers);
930 mzap_addent(zap_name_t *zn, uint64_t value)
933 zap_t *zap = zn->zn_zap;
934 int start = zap->zap_m.zap_alloc_next;
937 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
940 for (i = 0; i < zap->zap_m.zap_num_chunks; i++) {
941 ASSERTV(mzap_ent_phys_t *mze=&zap->zap_m.zap_phys->mz_chunk[i]);
942 ASSERT(strcmp(zn->zn_key_orig, mze->mze_name) != 0);
946 cd = mze_find_unused_cd(zap, zn->zn_hash);
947 /* given the limited size of the microzap, this can't happen */
948 ASSERT(cd < zap_maxcd(zap));
951 for (i = start; i < zap->zap_m.zap_num_chunks; i++) {
952 mzap_ent_phys_t *mze = &zap->zap_m.zap_phys->mz_chunk[i];
953 if (mze->mze_name[0] == 0) {
954 mze->mze_value = value;
956 (void) strcpy(mze->mze_name, zn->zn_key_orig);
957 zap->zap_m.zap_num_entries++;
958 zap->zap_m.zap_alloc_next = i+1;
959 if (zap->zap_m.zap_alloc_next ==
960 zap->zap_m.zap_num_chunks)
961 zap->zap_m.zap_alloc_next = 0;
962 mze_insert(zap, i, zn->zn_hash);
970 ASSERT(!"out of entries!");
974 zap_add(objset_t *os, uint64_t zapobj, const char *key,
975 int integer_size, uint64_t num_integers,
976 const void *val, dmu_tx_t *tx)
981 const uint64_t *intval = val;
984 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, &zap);
987 zn = zap_name_alloc(zap, key, MT_EXACT);
992 if (!zap->zap_ismicro) {
993 err = fzap_add(zn, integer_size, num_integers, val, tx);
994 zap = zn->zn_zap; /* fzap_add() may change zap */
995 } else if (integer_size != 8 || num_integers != 1 ||
996 strlen(key) >= MZAP_NAME_LEN) {
997 err = mzap_upgrade(&zn->zn_zap, tx, 0);
999 err = fzap_add(zn, integer_size, num_integers, val, tx);
1000 zap = zn->zn_zap; /* fzap_add() may change zap */
1006 mzap_addent(zn, *intval);
1009 ASSERT(zap == zn->zn_zap);
1011 if (zap != NULL) /* may be NULL if fzap_add() failed */
1017 zap_add_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
1018 int key_numints, int integer_size, uint64_t num_integers,
1019 const void *val, dmu_tx_t *tx)
1025 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, &zap);
1028 zn = zap_name_alloc_uint64(zap, key, key_numints);
1033 err = fzap_add(zn, integer_size, num_integers, val, tx);
1034 zap = zn->zn_zap; /* fzap_add() may change zap */
1036 if (zap != NULL) /* may be NULL if fzap_add() failed */
1042 zap_update(objset_t *os, uint64_t zapobj, const char *name,
1043 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx)
1047 const uint64_t *intval = val;
1055 * If there is an old value, it shouldn't change across the
1056 * lockdir (eg, due to bprewrite's xlation).
1058 if (integer_size == 8 && num_integers == 1)
1059 (void) zap_lookup(os, zapobj, name, 8, 1, &oldval);
1062 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, &zap);
1065 zn = zap_name_alloc(zap, name, MT_EXACT);
1070 if (!zap->zap_ismicro) {
1071 err = fzap_update(zn, integer_size, num_integers, val, tx);
1072 zap = zn->zn_zap; /* fzap_update() may change zap */
1073 } else if (integer_size != 8 || num_integers != 1 ||
1074 strlen(name) >= MZAP_NAME_LEN) {
1075 dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n",
1076 zapobj, integer_size, num_integers, name);
1077 err = mzap_upgrade(&zn->zn_zap, tx, 0);
1079 err = fzap_update(zn, integer_size, num_integers,
1081 zap = zn->zn_zap; /* fzap_update() may change zap */
1085 ASSERT3U(MZE_PHYS(zap, mze)->mze_value, ==, oldval);
1086 MZE_PHYS(zap, mze)->mze_value = *intval;
1088 mzap_addent(zn, *intval);
1091 ASSERT(zap == zn->zn_zap);
1093 if (zap != NULL) /* may be NULL if fzap_upgrade() failed */
1099 zap_update_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
1101 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx)
1107 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, &zap);
1110 zn = zap_name_alloc_uint64(zap, key, key_numints);
1115 err = fzap_update(zn, integer_size, num_integers, val, tx);
1116 zap = zn->zn_zap; /* fzap_update() may change zap */
1118 if (zap != NULL) /* may be NULL if fzap_upgrade() failed */
1124 zap_remove(objset_t *os, uint64_t zapobj, const char *name, dmu_tx_t *tx)
1126 return (zap_remove_norm(os, zapobj, name, MT_EXACT, tx));
1130 zap_remove_norm(objset_t *os, uint64_t zapobj, const char *name,
1131 matchtype_t mt, dmu_tx_t *tx)
1138 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, &zap);
1141 zn = zap_name_alloc(zap, name, mt);
1146 if (!zap->zap_ismicro) {
1147 err = fzap_remove(zn, tx);
1153 zap->zap_m.zap_num_entries--;
1154 bzero(&zap->zap_m.zap_phys->mz_chunk[mze->mze_chunkid],
1155 sizeof (mzap_ent_phys_t));
1156 mze_remove(zap, mze);
1165 zap_remove_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
1166 int key_numints, dmu_tx_t *tx)
1172 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, &zap);
1175 zn = zap_name_alloc_uint64(zap, key, key_numints);
1180 err = fzap_remove(zn, tx);
1187 * Routines for iterating over the attributes.
1191 zap_cursor_init_serialized(zap_cursor_t *zc, objset_t *os, uint64_t zapobj,
1192 uint64_t serialized)
1197 zc->zc_zapobj = zapobj;
1198 zc->zc_serialized = serialized;
1204 zap_cursor_init(zap_cursor_t *zc, objset_t *os, uint64_t zapobj)
1206 zap_cursor_init_serialized(zc, os, zapobj, 0);
1210 zap_cursor_fini(zap_cursor_t *zc)
1213 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER);
1214 zap_unlockdir(zc->zc_zap);
1218 rw_enter(&zc->zc_leaf->l_rwlock, RW_READER);
1219 zap_put_leaf(zc->zc_leaf);
1222 zc->zc_objset = NULL;
1226 zap_cursor_serialize(zap_cursor_t *zc)
1228 if (zc->zc_hash == -1ULL)
1230 if (zc->zc_zap == NULL)
1231 return (zc->zc_serialized);
1232 ASSERT((zc->zc_hash & zap_maxcd(zc->zc_zap)) == 0);
1233 ASSERT(zc->zc_cd < zap_maxcd(zc->zc_zap));
1236 * We want to keep the high 32 bits of the cursor zero if we can, so
1237 * that 32-bit programs can access this. So usually use a small
1238 * (28-bit) hash value so we can fit 4 bits of cd into the low 32-bits
1241 * [ collision differentiator | zap_hashbits()-bit hash value ]
1243 return ((zc->zc_hash >> (64 - zap_hashbits(zc->zc_zap))) |
1244 ((uint64_t)zc->zc_cd << zap_hashbits(zc->zc_zap)));
1248 zap_cursor_retrieve(zap_cursor_t *zc, zap_attribute_t *za)
1252 mzap_ent_t mze_tofind;
1255 if (zc->zc_hash == -1ULL)
1258 if (zc->zc_zap == NULL) {
1260 err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL,
1261 RW_READER, TRUE, FALSE, &zc->zc_zap);
1266 * To support zap_cursor_init_serialized, advance, retrieve,
1267 * we must add to the existing zc_cd, which may already
1268 * be 1 due to the zap_cursor_advance.
1270 ASSERT(zc->zc_hash == 0);
1271 hb = zap_hashbits(zc->zc_zap);
1272 zc->zc_hash = zc->zc_serialized << (64 - hb);
1273 zc->zc_cd += zc->zc_serialized >> hb;
1274 if (zc->zc_cd >= zap_maxcd(zc->zc_zap)) /* corrupt serialized */
1277 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER);
1279 if (!zc->zc_zap->zap_ismicro) {
1280 err = fzap_cursor_retrieve(zc->zc_zap, zc, za);
1284 mze_tofind.mze_hash = zc->zc_hash;
1285 mze_tofind.mze_cd = zc->zc_cd;
1287 mze = avl_find(&zc->zc_zap->zap_m.zap_avl, &mze_tofind, &idx);
1289 mze = avl_nearest(&zc->zc_zap->zap_m.zap_avl,
1293 mzap_ent_phys_t *mzep = MZE_PHYS(zc->zc_zap, mze);
1294 ASSERT3U(mze->mze_cd, ==, mzep->mze_cd);
1295 za->za_normalization_conflict =
1296 mzap_normalization_conflict(zc->zc_zap, NULL, mze);
1297 za->za_integer_length = 8;
1298 za->za_num_integers = 1;
1299 za->za_first_integer = mzep->mze_value;
1300 (void) strcpy(za->za_name, mzep->mze_name);
1301 zc->zc_hash = mze->mze_hash;
1302 zc->zc_cd = mze->mze_cd;
1305 zc->zc_hash = -1ULL;
1308 rw_exit(&zc->zc_zap->zap_rwlock);
1313 zap_cursor_advance(zap_cursor_t *zc)
1315 if (zc->zc_hash == -1ULL)
1321 zap_cursor_move_to_key(zap_cursor_t *zc, const char *name, matchtype_t mt)
1327 if (zc->zc_zap == NULL) {
1328 err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL,
1329 RW_READER, TRUE, FALSE, &zc->zc_zap);
1333 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER);
1336 zn = zap_name_alloc(zc->zc_zap, name, mt);
1338 rw_exit(&zc->zc_zap->zap_rwlock);
1342 if (!zc->zc_zap->zap_ismicro) {
1343 err = fzap_cursor_move_to_key(zc, zn);
1350 zc->zc_hash = mze->mze_hash;
1351 zc->zc_cd = mze->mze_cd;
1356 rw_exit(&zc->zc_zap->zap_rwlock);
1361 zap_get_stats(objset_t *os, uint64_t zapobj, zap_stats_t *zs)
1366 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
1370 bzero(zs, sizeof (zap_stats_t));
1372 if (zap->zap_ismicro) {
1373 zs->zs_blocksize = zap->zap_dbuf->db_size;
1374 zs->zs_num_entries = zap->zap_m.zap_num_entries;
1375 zs->zs_num_blocks = 1;
1377 fzap_get_stats(zap, zs);
1384 zap_count_write(objset_t *os, uint64_t zapobj, const char *name, int add,
1385 uint64_t *towrite, uint64_t *tooverwrite)
1392 * Since, we don't have a name, we cannot figure out which blocks will
1393 * be affected in this operation. So, account for the worst case :
1394 * - 3 blocks overwritten: target leaf, ptrtbl block, header block
1395 * - 4 new blocks written if adding:
1396 * - 2 blocks for possibly split leaves,
1397 * - 2 grown ptrtbl blocks
1399 * This also accomodates the case where an add operation to a fairly
1400 * large microzap results in a promotion to fatzap.
1403 *towrite += (3 + (add ? 4 : 0)) * SPA_MAXBLOCKSIZE;
1408 * We lock the zap with adding == FALSE. Because, if we pass
1409 * the actual value of add, it could trigger a mzap_upgrade().
1410 * At present we are just evaluating the possibility of this operation
1411 * and hence we donot want to trigger an upgrade.
1413 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
1417 if (!zap->zap_ismicro) {
1418 zap_name_t *zn = zap_name_alloc(zap, name, MT_EXACT);
1420 err = fzap_count_write(zn, add, towrite,
1425 * We treat this case as similar to (name == NULL)
1427 *towrite += (3 + (add ? 4 : 0)) * SPA_MAXBLOCKSIZE;
1431 * We are here if (name != NULL) and this is a micro-zap.
1432 * We account for the header block depending on whether it
1435 * Incase of an add-operation it is hard to find out
1436 * if this add will promote this microzap to fatzap.
1437 * Hence, we consider the worst case and account for the
1438 * blocks assuming this microzap would be promoted to a
1441 * 1 block overwritten : header block
1442 * 4 new blocks written : 2 new split leaf, 2 grown
1445 if (dmu_buf_freeable(zap->zap_dbuf))
1446 *tooverwrite += SPA_MAXBLOCKSIZE;
1448 *towrite += SPA_MAXBLOCKSIZE;
1451 *towrite += 4 * SPA_MAXBLOCKSIZE;
1459 #if defined(_KERNEL) && defined(HAVE_SPL)
1460 EXPORT_SYMBOL(zap_create);
1461 EXPORT_SYMBOL(zap_create_norm);
1462 EXPORT_SYMBOL(zap_create_flags);
1463 EXPORT_SYMBOL(zap_create_claim);
1464 EXPORT_SYMBOL(zap_create_claim_norm);
1465 EXPORT_SYMBOL(zap_destroy);
1466 EXPORT_SYMBOL(zap_lookup);
1467 EXPORT_SYMBOL(zap_lookup_norm);
1468 EXPORT_SYMBOL(zap_lookup_uint64);
1469 EXPORT_SYMBOL(zap_contains);
1470 EXPORT_SYMBOL(zap_prefetch_uint64);
1471 EXPORT_SYMBOL(zap_count_write);
1472 EXPORT_SYMBOL(zap_add);
1473 EXPORT_SYMBOL(zap_add_uint64);
1474 EXPORT_SYMBOL(zap_update);
1475 EXPORT_SYMBOL(zap_update_uint64);
1476 EXPORT_SYMBOL(zap_length);
1477 EXPORT_SYMBOL(zap_length_uint64);
1478 EXPORT_SYMBOL(zap_remove);
1479 EXPORT_SYMBOL(zap_remove_norm);
1480 EXPORT_SYMBOL(zap_remove_uint64);
1481 EXPORT_SYMBOL(zap_count);
1482 EXPORT_SYMBOL(zap_value_search);
1483 EXPORT_SYMBOL(zap_join);
1484 EXPORT_SYMBOL(zap_join_increment);
1485 EXPORT_SYMBOL(zap_add_int);
1486 EXPORT_SYMBOL(zap_remove_int);
1487 EXPORT_SYMBOL(zap_lookup_int);
1488 EXPORT_SYMBOL(zap_increment_int);
1489 EXPORT_SYMBOL(zap_add_int_key);
1490 EXPORT_SYMBOL(zap_lookup_int_key);
1491 EXPORT_SYMBOL(zap_increment);
1492 EXPORT_SYMBOL(zap_cursor_init);
1493 EXPORT_SYMBOL(zap_cursor_fini);
1494 EXPORT_SYMBOL(zap_cursor_retrieve);
1495 EXPORT_SYMBOL(zap_cursor_advance);
1496 EXPORT_SYMBOL(zap_cursor_serialize);
1497 EXPORT_SYMBOL(zap_cursor_move_to_key);
1498 EXPORT_SYMBOL(zap_cursor_init_serialized);
1499 EXPORT_SYMBOL(zap_get_stats);