158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
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*/
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#include <sys/zfs_context.h>
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#include <sys/spa.h>
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#include <sys/zio.h>
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#include <sys/ddt.h>
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#include <sys/zap.h>
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#include <sys/dmu_tx.h>
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#include <util/sscanf.h>
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int ddt_zap_leaf_blockshift = 12;
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int ddt_zap_indirect_blockshift = 12;
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static int
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ddt_zap_create(objset_t *os, uint64_t *objectp, dmu_tx_t *tx, boolean_t prehash)
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{
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zap_flags_t flags = ZAP_FLAG_HASH64 | ZAP_FLAG_UINT64_KEY;
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if (prehash)
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flags |= ZAP_FLAG_PRE_HASHED_KEY;
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*objectp = zap_create_flags(os, 0, flags, DMU_OT_DDT_ZAP,
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ddt_zap_leaf_blockshift, ddt_zap_indirect_blockshift,
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DMU_OT_NONE, 0, tx);
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return (*objectp == 0 ? ENOTSUP : 0);
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}
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static int
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ddt_zap_destroy(objset_t *os, uint64_t object, dmu_tx_t *tx)
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{
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return (zap_destroy(os, object, tx));
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}
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static int
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ddt_zap_lookup(objset_t *os, uint64_t object, ddt_entry_t *dde)
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{
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uchar_t cbuf[sizeof (dde->dde_phys) + 1];
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uint64_t one, csize;
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int error;
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error = zap_length_uint64(os, object, (uint64_t *)&dde->dde_key,
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DDT_KEY_WORDS, &one, &csize);
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if (error)
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return (error);
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ASSERT(one == 1);
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ASSERT(csize <= sizeof (cbuf));
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error = zap_lookup_uint64(os, object, (uint64_t *)&dde->dde_key,
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DDT_KEY_WORDS, 1, csize, cbuf);
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if (error)
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return (error);
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ddt_decompress(cbuf, dde->dde_phys, csize, sizeof (dde->dde_phys));
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return (0);
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}
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static void
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ddt_zap_prefetch(objset_t *os, uint64_t object, ddt_entry_t *dde)
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{
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(void) zap_prefetch_uint64(os, object, (uint64_t *)&dde->dde_key,
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DDT_KEY_WORDS);
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}
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static int
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ddt_zap_update(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx)
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{
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uchar_t cbuf[sizeof (dde->dde_phys) + 1];
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uint64_t csize;
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csize = ddt_compress(dde->dde_phys, cbuf,
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sizeof (dde->dde_phys), sizeof (cbuf));
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return (zap_update_uint64(os, object, (uint64_t *)&dde->dde_key,
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DDT_KEY_WORDS, 1, csize, cbuf, tx));
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}
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static int
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ddt_zap_remove(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx)
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{
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return (zap_remove_uint64(os, object, (uint64_t *)&dde->dde_key,
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DDT_KEY_WORDS, tx));
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}
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static int
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ddt_zap_walk(objset_t *os, uint64_t object, ddt_entry_t *dde, uint64_t *walk)
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{
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zap_cursor_t zc;
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zap_attribute_t za;
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int error;
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zap_cursor_init_serialized(&zc, os, object, *walk);
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if ((error = zap_cursor_retrieve(&zc, &za)) == 0) {
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uchar_t cbuf[sizeof (dde->dde_phys) + 1];
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uint64_t csize = za.za_num_integers;
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ASSERT(za.za_integer_length == 1);
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error = zap_lookup_uint64(os, object, (uint64_t *)za.za_name,
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DDT_KEY_WORDS, 1, csize, cbuf);
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ASSERT(error == 0);
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if (error == 0) {
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ddt_decompress(cbuf, dde->dde_phys, csize,
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sizeof (dde->dde_phys));
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dde->dde_key = *(ddt_key_t *)za.za_name;
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}
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zap_cursor_advance(&zc);
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*walk = zap_cursor_serialize(&zc);
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}
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zap_cursor_fini(&zc);
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return (error);
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}
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static uint64_t
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ddt_zap_count(objset_t *os, uint64_t object)
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{
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uint64_t count = 0;
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VERIFY(zap_count(os, object, &count) == 0);
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return (count);
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}
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const ddt_ops_t ddt_zap_ops = {
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"zap",
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ddt_zap_create,
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ddt_zap_destroy,
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ddt_zap_lookup,
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ddt_zap_prefetch,
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ddt_zap_update,
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ddt_zap_remove,
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ddt_zap_walk,
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ddt_zap_count,
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};
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