zap_micro.c revision 87e5029a3226958edab1512d6182bc74d8d80c9a
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The contents of this file are subject to the terms of the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Common Development and Distribution License, Version 1.0 only
fa9e4066f08beec538e775443c5be79dd423fcabahrens * (the "License"). You may not use this file except in compliance
fa9e4066f08beec538e775443c5be79dd423fcabahrens * with the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
fa9e4066f08beec538e775443c5be79dd423fcabahrens * or http://www.opensolaris.org/os/licensing.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * See the License for the specific language governing permissions
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and limitations under the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * When distributing Covered Code, include this CDDL HEADER in each
fa9e4066f08beec538e775443c5be79dd423fcabahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If applicable, add the following below this CDDL HEADER, with the
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fa9e4066f08beec538e775443c5be79dd423fcabahrens * information: Portions Copyright [yyyy] [name of copyright owner]
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fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER END
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Use is subject to license terms.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#pragma ident "%Z%%M% %I% %E% SMI"
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/spa.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dmu.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zfs_context.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zap.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zap_impl.h>
87e5029a3226958edab1512d6182bc74d8d80c9aahrens#include <sys/zap_leaf.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/avl.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic uint64_t mzap_write_cookie(zap_t *zap, uint64_t cookie,
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t entptr);
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void mzap_upgrade(zap_t *zap, dmu_tx_t *tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void
fa9e4066f08beec538e775443c5be79dd423fcabahrensmzap_byteswap(mzap_phys_t *buf, size_t size)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens int i, max;
fa9e4066f08beec538e775443c5be79dd423fcabahrens buf->mz_block_type = BSWAP_64(buf->mz_block_type);
fa9e4066f08beec538e775443c5be79dd423fcabahrens buf->mz_salt = BSWAP_64(buf->mz_salt);
fa9e4066f08beec538e775443c5be79dd423fcabahrens max = (size / MZAP_ENT_LEN) - 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (i = 0; i < max; i++) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens buf->mz_chunk[i].mze_value =
fa9e4066f08beec538e775443c5be79dd423fcabahrens BSWAP_64(buf->mz_chunk[i].mze_value);
fa9e4066f08beec538e775443c5be79dd423fcabahrens buf->mz_chunk[i].mze_cd =
fa9e4066f08beec538e775443c5be79dd423fcabahrens BSWAP_32(buf->mz_chunk[i].mze_cd);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_byteswap(void *buf, size_t size)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t block_type;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens block_type = *(uint64_t *)buf;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens switch (block_type) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens case ZBT_MICRO:
fa9e4066f08beec538e775443c5be79dd423fcabahrens case BSWAP_64(ZBT_MICRO):
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* ASSERT(magic == ZAP_LEAF_MAGIC); */
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_byteswap(buf, size);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens default:
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(size == (1<<ZAP_BLOCK_SHIFT));
fa9e4066f08beec538e775443c5be79dd423fcabahrens fzap_byteswap(buf, size);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic int
fa9e4066f08beec538e775443c5be79dd423fcabahrensmze_compare(const void *arg1, const void *arg2)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens const mzap_ent_t *mze1 = arg1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens const mzap_ent_t *mze2 = arg2;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze1->mze_hash > mze2->mze_hash)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (+1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze1->mze_hash < mze2->mze_hash)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze1->mze_phys.mze_cd > mze2->mze_phys.mze_cd)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (+1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze1->mze_phys.mze_cd < mze2->mze_phys.mze_cd)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void
fa9e4066f08beec538e775443c5be79dd423fcabahrensmze_insert(zap_t *zap, int chunkid, uint64_t hash, mzap_ent_phys_t *mzep)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t *mze;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(zap->zap_ismicro);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(mzep->mze_cd < ZAP_MAXCD);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(zap_hash(zap, mzep->mze_name), ==, hash);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze = kmem_alloc(sizeof (mzap_ent_t), KM_SLEEP);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze->mze_chunkid = chunkid;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze->mze_hash = hash;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze->mze_phys = *mzep;
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_add(&zap->zap_m.zap_avl, mze);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic mzap_ent_t *
fa9e4066f08beec538e775443c5be79dd423fcabahrensmze_find(zap_t *zap, const char *name, uint64_t hash)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t mze_tofind;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t *mze;
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_index_t idx;
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_tree_t *avl = &zap->zap_m.zap_avl;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(zap->zap_ismicro);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(zap_hash(zap, name), ==, hash);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (strlen(name) >= sizeof (mze_tofind.mze_phys.mze_name))
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze_tofind.mze_hash = hash;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze_tofind.mze_phys.mze_cd = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze = avl_find(avl, &mze_tofind, &idx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze == NULL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze = avl_nearest(avl, idx, AVL_AFTER);
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (; mze && mze->mze_hash == hash; mze = AVL_NEXT(avl, mze)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (strcmp(name, mze->mze_phys.mze_name) == 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (mze);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic uint32_t
fa9e4066f08beec538e775443c5be79dd423fcabahrensmze_find_unused_cd(zap_t *zap, uint64_t hash)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t mze_tofind;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t *mze;
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_index_t idx;
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_tree_t *avl = &zap->zap_m.zap_avl;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint32_t cd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(zap->zap_ismicro);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze_tofind.mze_hash = hash;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze_tofind.mze_phys.mze_cd = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens cd = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (mze = avl_find(avl, &mze_tofind, &idx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze && mze->mze_hash == hash; mze = AVL_NEXT(avl, mze)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze->mze_phys.mze_cd != cd)
fa9e4066f08beec538e775443c5be79dd423fcabahrens break;
fa9e4066f08beec538e775443c5be79dd423fcabahrens cd++;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (cd);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void
fa9e4066f08beec538e775443c5be79dd423fcabahrensmze_remove(zap_t *zap, mzap_ent_t *mze)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(zap->zap_ismicro);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_remove(&zap->zap_m.zap_avl, mze);
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(mze, sizeof (mzap_ent_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void
fa9e4066f08beec538e775443c5be79dd423fcabahrensmze_destroy(zap_t *zap)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t *mze;
fa9e4066f08beec538e775443c5be79dd423fcabahrens void *avlcookie = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens while (mze = avl_destroy_nodes(&zap->zap_m.zap_avl, &avlcookie))
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(mze, sizeof (mzap_ent_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_destroy(&zap->zap_m.zap_avl);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic zap_t *
fa9e4066f08beec538e775443c5be79dd423fcabahrensmzap_open(objset_t *os, uint64_t obj, dmu_buf_t *db)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_t *winner;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_t *zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int i;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(MZAP_ENT_LEN, ==, sizeof (mzap_ent_phys_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap = kmem_zalloc(sizeof (zap_t), KM_SLEEP);
fa9e4066f08beec538e775443c5be79dd423fcabahrens rw_init(&zap->zap_rwlock, 0, 0, 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens rw_enter(&zap->zap_rwlock, RW_WRITER);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_objset = os;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_object = obj;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_dbuf = db;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (((uint64_t *)db->db_data)[0] != ZBT_MICRO) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, 0, 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_ismicro = TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Make sure that zap_ismicro is set before we let others see
fa9e4066f08beec538e775443c5be79dd423fcabahrens * it, because zap_lockdir() checks zap_ismicro without the lock
fa9e4066f08beec538e775443c5be79dd423fcabahrens * held.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens winner = dmu_buf_set_user(db, zap, &zap->zap_m.zap_phys, zap_pageout);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (winner != NULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(zap, sizeof (zap_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (winner);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zap->zap_ismicro) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_salt = zap->zap_m.zap_phys->mz_salt;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_m.zap_num_chunks = db->db_size / MZAP_ENT_LEN - 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_create(&zap->zap_m.zap_avl, mze_compare,
fa9e4066f08beec538e775443c5be79dd423fcabahrens sizeof (mzap_ent_t), offsetof(mzap_ent_t, mze_node));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (i = 0; i < zap->zap_m.zap_num_chunks; i++) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_phys_t *mze =
fa9e4066f08beec538e775443c5be79dd423fcabahrens &zap->zap_m.zap_phys->mz_chunk[i];
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze->mze_name[0]) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_m.zap_num_entries++;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze_insert(zap, i,
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_hash(zap, mze->mze_name), mze);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_salt = zap->zap_f.zap_phys->zap_salt;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens rw_exit(&zap->zap_rwlock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx,
fa9e4066f08beec538e775443c5be79dd423fcabahrens krw_t lti, int fatreader, zap_t **zapp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_t *zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_buf_t *db;
fa9e4066f08beec538e775443c5be79dd423fcabahrens krw_t lt;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens *zapp = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens db = dmu_buf_hold(os, obj, 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#ifdef ZFS_DEBUG
fa9e4066f08beec538e775443c5be79dd423fcabahrens {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_object_info_t doi;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_object_info_from_db(db, &doi);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(dmu_ot[doi.doi_type].ot_byteswap == zap_byteswap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens#endif
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The zap can deal with EIO here, but its callers don't yet, so
fa9e4066f08beec538e775443c5be79dd423fcabahrens * spare them by doing a mustsucceed read.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_buf_read(db);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap = dmu_buf_get_user(db);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zap == NULL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap = mzap_open(os, obj, db);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * We're checking zap_ismicro without the lock held, in order to
fa9e4066f08beec538e775443c5be79dd423fcabahrens * tell what type of lock we want. Once we have some sort of
fa9e4066f08beec538e775443c5be79dd423fcabahrens * lock, see if it really is the right type. In practice this
fa9e4066f08beec538e775443c5be79dd423fcabahrens * can only be different if it was upgraded from micro to fat,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and micro wanted WRITER but fat only needs READER.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens lt = (!zap->zap_ismicro && fatreader) ? RW_READER : lti;
fa9e4066f08beec538e775443c5be79dd423fcabahrens rw_enter(&zap->zap_rwlock, lt);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (lt != ((!zap->zap_ismicro && fatreader) ? RW_READER : lti)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* it was upgraded, now we only need reader */
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(lt == RW_WRITER);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(RW_READER ==
fa9e4066f08beec538e775443c5be79dd423fcabahrens (!zap->zap_ismicro && fatreader) ? RW_READER : lti);
fa9e4066f08beec538e775443c5be79dd423fcabahrens rw_downgrade(&zap->zap_rwlock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens lt = RW_READER;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_objset = os;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (lt == RW_WRITER)
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_buf_will_dirty(db, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3P(zap->zap_dbuf, ==, db);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(!zap->zap_ismicro ||
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_m.zap_num_entries <= zap->zap_m.zap_num_chunks);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zap->zap_ismicro && tx &&
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_m.zap_num_entries == zap->zap_m.zap_num_chunks) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t newsz = db->db_size + SPA_MINBLOCKSIZE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (newsz > MZAP_MAX_BLKSZ) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf("upgrading obj %llu: num_entries=%u\n",
fa9e4066f08beec538e775443c5be79dd423fcabahrens obj, zap->zap_m.zap_num_entries);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_upgrade(zap, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens *zapp = zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = dmu_object_set_blocksize(os, obj, newsz, 0, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(err, ==, 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_m.zap_num_chunks =
fa9e4066f08beec538e775443c5be79dd423fcabahrens db->db_size / MZAP_ENT_LEN - 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens *zapp = zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_unlockdir(zap_t *zap)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens rw_exit(&zap->zap_rwlock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_buf_rele(zap->zap_dbuf);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void
fa9e4066f08beec538e775443c5be79dd423fcabahrensmzap_upgrade(zap_t *zap, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_phys_t *mzp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int i, sz, nchunks, err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens sz = zap->zap_dbuf->db_size;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzp = kmem_alloc(sz, KM_SLEEP);
fa9e4066f08beec538e775443c5be79dd423fcabahrens bcopy(zap->zap_dbuf->db_data, mzp, sz);
fa9e4066f08beec538e775443c5be79dd423fcabahrens nchunks = zap->zap_m.zap_num_chunks;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = dmu_object_set_blocksize(zap->zap_objset, zap->zap_object,
fa9e4066f08beec538e775443c5be79dd423fcabahrens 1ULL << ZAP_BLOCK_SHIFT, 0, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(err == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf("upgrading obj=%llu with %u chunks\n",
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_object, nchunks);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze_destroy(zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens fzap_upgrade(zap, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (i = 0; i < nchunks; i++) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_phys_t *mze = &mzp->mz_chunk[i];
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze->mze_name[0] == 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens continue;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf("adding %s=%llu\n",
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze->mze_name, mze->mze_value);
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = fzap_add_cd(zap,
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze->mze_name, 8, 1, &mze->mze_value,
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze->mze_cd, tx, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3U(err, ==, 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(mzp, sz);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensuint64_t
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_hash(zap_t *zap, const char *name)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens const uint8_t *cp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint8_t c;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t crc = zap->zap_salt;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(crc != 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY);
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (cp = (const uint8_t *)name; (c = *cp) != '\0'; cp++)
fa9e4066f08beec538e775443c5be79dd423fcabahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ c) & 0xFF];
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Only use 28 bits, since we need 4 bits in the cookie for the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * collision differentiator. We MUST use the high bits, since
fa9e4066f08beec538e775443c5be79dd423fcabahrens * those are the onces that we first pay attention to when
fa9e4066f08beec538e775443c5be79dd423fcabahrens * chosing the bucket.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens crc &= ~((1ULL << (64 - ZAP_HASHBITS)) - 1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (crc);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void
fa9e4066f08beec538e775443c5be79dd423fcabahrensmzap_create_impl(objset_t *os, uint64_t obj, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_buf_t *db;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_phys_t *zp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens db = dmu_buf_hold(os, obj, 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#ifdef ZFS_DEBUG
fa9e4066f08beec538e775443c5be79dd423fcabahrens {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_object_info_t doi;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_object_info_from_db(db, &doi);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(dmu_ot[doi.doi_type].ot_byteswap == zap_byteswap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens#endif
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_buf_will_dirty(db, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zp = db->db_data;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zp->mz_block_type = ZBT_MICRO;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zp->mz_salt = ((uintptr_t)db ^ (uintptr_t)tx ^ (obj << 1)) | 1ULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(zp->mz_salt != 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_buf_rele(db);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_create_claim(objset_t *os, uint64_t obj, dmu_object_type_t ot,
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = dmu_object_claim(os, obj, ot, 0, bonustype, bonuslen, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err != 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_create_impl(os, obj, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensuint64_t
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_create(objset_t *os, dmu_object_type_t ot,
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t obj = dmu_object_alloc(os, ot, 0, bonustype, bonuslen, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_create_impl(os, obj, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (obj);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_destroy(objset_t *os, uint64_t zapobj, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * dmu_object_free will free the object number and free the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * data. Freeing the data will cause our pageout function to be
fa9e4066f08beec538e775443c5be79dd423fcabahrens * called, which will destroy our data (zap_leaf_t's and zap_t).
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (dmu_object_free(os, zapobj, tx));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens_NOTE(ARGSUSED(0))
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_pageout(dmu_buf_t *db, void *vmzap)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_t *zap = vmzap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens rw_destroy(&zap->zap_rwlock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zap->zap_ismicro) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze_destroy(zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(zap, sizeof (zap_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_count(objset_t *os, uint64_t zapobj, uint64_t *count)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_t *zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, &zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (!zap->zap_ismicro) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = fzap_count(zap, count);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens *count = zap->zap_m.zap_num_entries;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_unlockdir(zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Routines for maniplulating attributes.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_lookup(objset_t *os, uint64_t zapobj, const char *name,
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t integer_size, uint64_t num_integers, void *buf)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_t *zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t *mze;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, &zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (!zap->zap_ismicro) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = fzap_lookup(zap, name,
fa9e4066f08beec538e775443c5be79dd423fcabahrens integer_size, num_integers, buf);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze = mze_find(zap, name, zap_hash(zap, name));
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze == NULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = ENOENT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (num_integers < 1)
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = EOVERFLOW;
fa9e4066f08beec538e775443c5be79dd423fcabahrens else if (integer_size != 8)
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = EINVAL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens else
fa9e4066f08beec538e775443c5be79dd423fcabahrens *(uint64_t *)buf = mze->mze_phys.mze_value;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_unlockdir(zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_length(objset_t *os, uint64_t zapobj, const char *name,
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t *integer_size, uint64_t *num_integers)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_t *zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t *mze;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, &zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (!zap->zap_ismicro) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = fzap_length(zap, name, integer_size, num_integers);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze = mze_find(zap, name, zap_hash(zap, name));
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze == NULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = ENOENT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (integer_size)
fa9e4066f08beec538e775443c5be79dd423fcabahrens *integer_size = 8;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (num_integers)
fa9e4066f08beec538e775443c5be79dd423fcabahrens *num_integers = 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_unlockdir(zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic void
fa9e4066f08beec538e775443c5be79dd423fcabahrensmzap_addent(zap_t *zap, const char *name, uint64_t hash, uint64_t value)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens int i;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int start = zap->zap_m.zap_alloc_next;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint32_t cd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf("obj=%llu %s=%llu\n", zap->zap_object, name, value);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#ifdef ZFS_DEBUG
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (i = 0; i < zap->zap_m.zap_num_chunks; i++) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_phys_t *mze = &zap->zap_m.zap_phys->mz_chunk[i];
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(strcmp(name, mze->mze_name) != 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens#endif
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens cd = mze_find_unused_cd(zap, hash);
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* given the limited size of the microzap, this can't happen */
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(cd != ZAP_MAXCD);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensagain:
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (i = start; i < zap->zap_m.zap_num_chunks; i++) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_phys_t *mze = &zap->zap_m.zap_phys->mz_chunk[i];
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze->mze_name[0] == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze->mze_value = value;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze->mze_cd = cd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens (void) strcpy(mze->mze_name, name);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_m.zap_num_entries++;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_m.zap_alloc_next = i+1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zap->zap_m.zap_alloc_next ==
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_m.zap_num_chunks)
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_m.zap_alloc_next = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze_insert(zap, i, hash, mze);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (start != 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens start = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens goto again;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(!"out of entries!");
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_add(objset_t *os, uint64_t zapobj, const char *name,
fa9e4066f08beec538e775443c5be79dd423fcabahrens int integer_size, uint64_t num_integers,
fa9e4066f08beec538e775443c5be79dd423fcabahrens const void *val, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_t *zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t *mze;
fa9e4066f08beec538e775443c5be79dd423fcabahrens const uint64_t *intval = val;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t hash;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, &zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (!zap->zap_ismicro) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = fzap_add(zap, name, integer_size, num_integers, val, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else if (integer_size != 8 || num_integers != 1 ||
fa9e4066f08beec538e775443c5be79dd423fcabahrens strlen(name) >= MZAP_NAME_LEN) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n",
fa9e4066f08beec538e775443c5be79dd423fcabahrens zapobj, integer_size, num_integers, name);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_upgrade(zap, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = fzap_add(zap, name, integer_size, num_integers, val, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens hash = zap_hash(zap, name);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze = mze_find(zap, name, hash);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze != NULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = EEXIST;
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_addent(zap, name, hash, *intval);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_unlockdir(zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_update(objset_t *os, uint64_t zapobj, const char *name,
fa9e4066f08beec538e775443c5be79dd423fcabahrens int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_t *zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t *mze;
fa9e4066f08beec538e775443c5be79dd423fcabahrens const uint64_t *intval = val;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t hash;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, &zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (!zap->zap_ismicro) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = fzap_update(zap, name,
fa9e4066f08beec538e775443c5be79dd423fcabahrens integer_size, num_integers, val, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else if (integer_size != 8 || num_integers != 1 ||
fa9e4066f08beec538e775443c5be79dd423fcabahrens strlen(name) >= MZAP_NAME_LEN) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n",
fa9e4066f08beec538e775443c5be79dd423fcabahrens zapobj, integer_size, num_integers, name);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_upgrade(zap, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = fzap_update(zap, name,
fa9e4066f08beec538e775443c5be79dd423fcabahrens integer_size, num_integers, val, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens hash = zap_hash(zap, name);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze = mze_find(zap, name, hash);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze != NULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze->mze_phys.mze_value = *intval;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_m.zap_phys->mz_chunk
fa9e4066f08beec538e775443c5be79dd423fcabahrens [mze->mze_chunkid].mze_value = *intval;
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_addent(zap, name, hash, *intval);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_unlockdir(zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_remove(objset_t *os, uint64_t zapobj, const char *name, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_t *zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t *mze;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, &zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (!zap->zap_ismicro) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = fzap_remove(zap, name, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze = mze_find(zap, name, zap_hash(zap, name));
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze == NULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf("fail: %s\n", name);
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = ENOENT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dprintf("success: %s\n", name);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap->zap_m.zap_num_entries--;
fa9e4066f08beec538e775443c5be79dd423fcabahrens bzero(&zap->zap_m.zap_phys->mz_chunk[mze->mze_chunkid],
fa9e4066f08beec538e775443c5be79dd423fcabahrens sizeof (mzap_ent_phys_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze_remove(zap, mze);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_unlockdir(zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Routines for iterating over the attributes.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * We want to keep the high 32 bits of the cursor zero if we can, so
fa9e4066f08beec538e775443c5be79dd423fcabahrens * that 32-bit programs can access this. So use a small hash value so
fa9e4066f08beec538e775443c5be79dd423fcabahrens * we can fit 4 bits of cd into the 32-bit cursor.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * [ 4 zero bits | 32-bit collision differentiator | 28-bit hash value ]
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_cursor_init_serialized(zap_cursor_t *zc, objset_t *os, uint64_t zapobj,
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t serialized)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_objset = os;
87e5029a3226958edab1512d6182bc74d8d80c9aahrens zc->zc_zap = NULL;
87e5029a3226958edab1512d6182bc74d8d80c9aahrens zc->zc_leaf = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_zapobj = zapobj;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (serialized == -1ULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_hash = -1ULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_cd = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_hash = serialized << (64-ZAP_HASHBITS);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_cd = serialized >> ZAP_HASHBITS;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zc->zc_cd >= ZAP_MAXCD) /* corrupt serialized */
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_cd = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
87e5029a3226958edab1512d6182bc74d8d80c9aahrensvoid
87e5029a3226958edab1512d6182bc74d8d80c9aahrenszap_cursor_init(zap_cursor_t *zc, objset_t *os, uint64_t zapobj)
87e5029a3226958edab1512d6182bc74d8d80c9aahrens{
87e5029a3226958edab1512d6182bc74d8d80c9aahrens zap_cursor_init_serialized(zc, os, zapobj, 0);
87e5029a3226958edab1512d6182bc74d8d80c9aahrens}
87e5029a3226958edab1512d6182bc74d8d80c9aahrens
87e5029a3226958edab1512d6182bc74d8d80c9aahrensvoid
87e5029a3226958edab1512d6182bc74d8d80c9aahrenszap_cursor_fini(zap_cursor_t *zc)
87e5029a3226958edab1512d6182bc74d8d80c9aahrens{
87e5029a3226958edab1512d6182bc74d8d80c9aahrens if (zc->zc_zap) {
87e5029a3226958edab1512d6182bc74d8d80c9aahrens rw_enter(&zc->zc_zap->zap_rwlock, RW_READER);
87e5029a3226958edab1512d6182bc74d8d80c9aahrens zap_unlockdir(zc->zc_zap);
87e5029a3226958edab1512d6182bc74d8d80c9aahrens zc->zc_zap = NULL;
87e5029a3226958edab1512d6182bc74d8d80c9aahrens }
87e5029a3226958edab1512d6182bc74d8d80c9aahrens if (zc->zc_leaf) {
87e5029a3226958edab1512d6182bc74d8d80c9aahrens rw_enter(&zc->zc_leaf->l_rwlock, RW_READER);
87e5029a3226958edab1512d6182bc74d8d80c9aahrens zap_put_leaf(zc->zc_leaf);
87e5029a3226958edab1512d6182bc74d8d80c9aahrens zc->zc_leaf = NULL;
87e5029a3226958edab1512d6182bc74d8d80c9aahrens }
87e5029a3226958edab1512d6182bc74d8d80c9aahrens zc->zc_objset = NULL;
87e5029a3226958edab1512d6182bc74d8d80c9aahrens}
87e5029a3226958edab1512d6182bc74d8d80c9aahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensuint64_t
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_cursor_serialize(zap_cursor_t *zc)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zc->zc_hash == -1ULL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (-1ULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT((zc->zc_hash & (ZAP_MAXCD-1)) == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(zc->zc_cd < ZAP_MAXCD);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return ((zc->zc_hash >> (64-ZAP_HASHBITS)) |
fa9e4066f08beec538e775443c5be79dd423fcabahrens ((uint64_t)zc->zc_cd << ZAP_HASHBITS));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_cursor_retrieve(zap_cursor_t *zc, zap_attribute_t *za)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_index_t idx;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t mze_tofind;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mzap_ent_t *mze;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zc->zc_hash == -1ULL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (ENOENT);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
87e5029a3226958edab1512d6182bc74d8d80c9aahrens if (zc->zc_zap == NULL) {
87e5029a3226958edab1512d6182bc74d8d80c9aahrens err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL,
87e5029a3226958edab1512d6182bc74d8d80c9aahrens RW_READER, TRUE, &zc->zc_zap);
87e5029a3226958edab1512d6182bc74d8d80c9aahrens if (err)
87e5029a3226958edab1512d6182bc74d8d80c9aahrens return (err);
87e5029a3226958edab1512d6182bc74d8d80c9aahrens } else {
87e5029a3226958edab1512d6182bc74d8d80c9aahrens rw_enter(&zc->zc_zap->zap_rwlock, RW_READER);
87e5029a3226958edab1512d6182bc74d8d80c9aahrens }
87e5029a3226958edab1512d6182bc74d8d80c9aahrens if (!zc->zc_zap->zap_ismicro) {
87e5029a3226958edab1512d6182bc74d8d80c9aahrens err = fzap_cursor_retrieve(zc->zc_zap, zc, za);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = ENOENT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze_tofind.mze_hash = zc->zc_hash;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mze_tofind.mze_phys.mze_cd = zc->zc_cd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
87e5029a3226958edab1512d6182bc74d8d80c9aahrens mze = avl_find(&zc->zc_zap->zap_m.zap_avl, &mze_tofind, &idx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(mze == NULL || 0 == bcmp(&mze->mze_phys,
87e5029a3226958edab1512d6182bc74d8d80c9aahrens &zc->zc_zap->zap_m.zap_phys->mz_chunk[mze->mze_chunkid],
fa9e4066f08beec538e775443c5be79dd423fcabahrens sizeof (mze->mze_phys)));
87e5029a3226958edab1512d6182bc74d8d80c9aahrens if (mze == NULL) {
87e5029a3226958edab1512d6182bc74d8d80c9aahrens mze = avl_nearest(&zc->zc_zap->zap_m.zap_avl,
87e5029a3226958edab1512d6182bc74d8d80c9aahrens idx, AVL_AFTER);
87e5029a3226958edab1512d6182bc74d8d80c9aahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mze) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens za->za_integer_length = 8;
fa9e4066f08beec538e775443c5be79dd423fcabahrens za->za_num_integers = 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens za->za_first_integer = mze->mze_phys.mze_value;
fa9e4066f08beec538e775443c5be79dd423fcabahrens (void) strcpy(za->za_name, mze->mze_phys.mze_name);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_hash = mze->mze_hash;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_cd = mze->mze_phys.mze_cd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_hash = -1ULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
87e5029a3226958edab1512d6182bc74d8d80c9aahrens rw_exit(&zc->zc_zap->zap_rwlock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_cursor_advance(zap_cursor_t *zc)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zc->zc_hash == -1ULL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_cd++;
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zc->zc_cd >= ZAP_MAXCD) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_cd = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_hash += 1ULL<<(64-ZAP_HASHBITS);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zc->zc_hash == 0) /* EOF */
fa9e4066f08beec538e775443c5be79dd423fcabahrens zc->zc_hash = -1ULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszap_get_stats(objset_t *os, uint64_t zapobj, zap_stats_t *zs)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens int err;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_t *zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, &zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (err)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (err);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens bzero(zs, sizeof (zap_stats_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zap->zap_ismicro) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zs->zs_blocksize = zap->zap_dbuf->db_size;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zs->zs_num_entries = zap->zap_m.zap_num_entries;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zs->zs_num_blocks = 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens fzap_get_stats(zap, zs);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_unlockdir(zap);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}