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