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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 https://opensource.org/licenses/CDDL-1.0.
* 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.
* Copyright (c) 2018 by Delphix. All rights reserved.
*/
#include <sys/zfs_context.h>
#include <sys/spa.h>
#include <sys/zio.h>
#include <sys/ddt.h>
#include <sys/ddt_impl.h>
#include <sys/zap.h>
#include <sys/dmu_tx.h>
#include <sys/zio_compress.h>
static unsigned int ddt_zap_default_bs = 15;
static unsigned int ddt_zap_default_ibs = 15;
#define DDT_ZAP_COMPRESS_BYTEORDER_MASK 0x80
#define DDT_ZAP_COMPRESS_FUNCTION_MASK 0x7f
#define DDT_KEY_WORDS (sizeof (ddt_key_t) / sizeof (uint64_t))
static size_t
ddt_zap_compress(void *src, uchar_t *dst, size_t s_len, size_t d_len)
{
uchar_t *version = dst++;
int cpfunc = ZIO_COMPRESS_ZLE;
zio_compress_info_t *ci = &zio_compress_table[cpfunc];
size_t c_len;
ASSERT3U(d_len, >=, s_len + 1); /* no compression plus version byte */
c_len = ci->ci_compress(src, dst, s_len, d_len - 1, ci->ci_level);
if (c_len == s_len) {
cpfunc = ZIO_COMPRESS_OFF;
memcpy(dst, src, s_len);
}
*version = cpfunc;
if (ZFS_HOST_BYTEORDER)
*version |= DDT_ZAP_COMPRESS_BYTEORDER_MASK;
return (c_len + 1);
}
static void
ddt_zap_decompress(uchar_t *src, void *dst, size_t s_len, size_t d_len)
{
uchar_t version = *src++;
int cpfunc = version & DDT_ZAP_COMPRESS_FUNCTION_MASK;
zio_compress_info_t *ci = &zio_compress_table[cpfunc];
if (ci->ci_decompress != NULL)
(void) ci->ci_decompress(src, dst, s_len, d_len, ci->ci_level);
else
memcpy(dst, src, d_len);
if (((version & DDT_ZAP_COMPRESS_BYTEORDER_MASK) != 0) !=
(ZFS_HOST_BYTEORDER != 0))
byteswap_uint64_array(dst, d_len);
}
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_default_bs, ddt_zap_default_ibs,
DMU_OT_NONE, 0, tx);
return (*objectp == 0 ? SET_ERROR(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;
error = zap_length_uint64(os, object, (uint64_t *)&dde->dde_key,
DDT_KEY_WORDS, &one, &csize);
if (error)
return (error);
ASSERT3U(one, ==, 1);
ASSERT3U(csize, <=, (sizeof (dde->dde_phys) + 1));
cbuf = kmem_alloc(csize, KM_SLEEP);
error = zap_lookup_uint64(os, object, (uint64_t *)&dde->dde_key,
DDT_KEY_WORDS, 1, csize, cbuf);
if (error == 0)
ddt_zap_decompress(cbuf, dde->dde_phys, csize,
sizeof (dde->dde_phys));
kmem_free(cbuf, csize);
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)
{
const size_t cbuf_size = sizeof (dde->dde_phys) + 1;
uchar_t *cbuf = kmem_alloc(cbuf_size, KM_SLEEP);
uint64_t csize = ddt_zap_compress(dde->dde_phys, cbuf,
sizeof (dde->dde_phys), cbuf_size);
int error = zap_update_uint64(os, object, (uint64_t *)&dde->dde_key,
DDT_KEY_WORDS, 1, csize, cbuf, tx);
kmem_free(cbuf, cbuf_size);
return (error);
}
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;
if (*walk == 0) {
/*
* We don't want to prefetch the entire ZAP object, because
* it can be enormous. Also the primary use of DDT iteration
* is for scrubbing, in which case we will be issuing many
* scrub I/Os for each ZAP block that we read in, so
* reading the ZAP is unlikely to be the bottleneck.
*/
zap_cursor_init_noprefetch(&zc, os, object);
} else {
zap_cursor_init_serialized(&zc, os, object, *walk);
}
if ((error = zap_cursor_retrieve(&zc, &za)) == 0) {
uint64_t csize = za.za_num_integers;
ASSERT3U(za.za_integer_length, ==, 1);
ASSERT3U(csize, <=, sizeof (dde->dde_phys) + 1);
uchar_t *cbuf = kmem_alloc(csize, KM_SLEEP);
error = zap_lookup_uint64(os, object, (uint64_t *)za.za_name,
DDT_KEY_WORDS, 1, csize, cbuf);
ASSERT0(error);
if (error == 0) {
ddt_zap_decompress(cbuf, dde->dde_phys, csize,
sizeof (dde->dde_phys));
dde->dde_key = *(ddt_key_t *)za.za_name;
}
kmem_free(cbuf, csize);
zap_cursor_advance(&zc);
*walk = zap_cursor_serialize(&zc);
}
zap_cursor_fini(&zc);
return (error);
}
static int
ddt_zap_count(objset_t *os, uint64_t object, uint64_t *count)
{
return (zap_count(os, object, 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,
};
/* BEGIN CSTYLED */
ZFS_MODULE_PARAM(zfs_dedup, , ddt_zap_default_bs, UINT, ZMOD_RW,
"DDT ZAP leaf blockshift");
ZFS_MODULE_PARAM(zfs_dedup, , ddt_zap_default_ibs, UINT, ZMOD_RW,
"DDT ZAP indirect blockshift");
/* END CSTYLED */
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