mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-29 04:19:35 +03:00
149 lines
4.0 KiB
C
149 lines
4.0 KiB
C
/*
|
|
* 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 2007 Sun Microsystems, Inc. All rights reserved.
|
|
* Use is subject to license terms.
|
|
*/
|
|
|
|
#pragma ident "%Z%%M% %I% %E% SMI"
|
|
|
|
#include <sys/zfs_context.h>
|
|
#include <sys/compress.h>
|
|
#include <sys/spa.h>
|
|
#include <sys/zio.h>
|
|
#include <sys/zio_compress.h>
|
|
|
|
/*
|
|
* Compression vectors.
|
|
*/
|
|
|
|
zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS] = {
|
|
{NULL, NULL, 0, "inherit"},
|
|
{NULL, NULL, 0, "on"},
|
|
{NULL, NULL, 0, "uncompressed"},
|
|
{lzjb_compress, lzjb_decompress, 0, "lzjb"},
|
|
{NULL, NULL, 0, "empty"},
|
|
{gzip_compress, gzip_decompress, 1, "gzip-1"},
|
|
{gzip_compress, gzip_decompress, 2, "gzip-2"},
|
|
{gzip_compress, gzip_decompress, 3, "gzip-3"},
|
|
{gzip_compress, gzip_decompress, 4, "gzip-4"},
|
|
{gzip_compress, gzip_decompress, 5, "gzip-5"},
|
|
{gzip_compress, gzip_decompress, 6, "gzip-6"},
|
|
{gzip_compress, gzip_decompress, 7, "gzip-7"},
|
|
{gzip_compress, gzip_decompress, 8, "gzip-8"},
|
|
{gzip_compress, gzip_decompress, 9, "gzip-9"},
|
|
};
|
|
|
|
uint8_t
|
|
zio_compress_select(uint8_t child, uint8_t parent)
|
|
{
|
|
ASSERT(child < ZIO_COMPRESS_FUNCTIONS);
|
|
ASSERT(parent < ZIO_COMPRESS_FUNCTIONS);
|
|
ASSERT(parent != ZIO_COMPRESS_INHERIT && parent != ZIO_COMPRESS_ON);
|
|
|
|
if (child == ZIO_COMPRESS_INHERIT)
|
|
return (parent);
|
|
|
|
if (child == ZIO_COMPRESS_ON)
|
|
return (ZIO_COMPRESS_ON_VALUE);
|
|
|
|
return (child);
|
|
}
|
|
|
|
int
|
|
zio_compress_data(int cpfunc, void *src, uint64_t srcsize, void **destp,
|
|
uint64_t *destsizep, uint64_t *destbufsizep)
|
|
{
|
|
uint64_t *word, *word_end;
|
|
uint64_t ciosize, gapsize, destbufsize;
|
|
zio_compress_info_t *ci = &zio_compress_table[cpfunc];
|
|
char *dest;
|
|
uint_t allzero;
|
|
|
|
ASSERT((uint_t)cpfunc < ZIO_COMPRESS_FUNCTIONS);
|
|
ASSERT((uint_t)cpfunc == ZIO_COMPRESS_EMPTY || ci->ci_compress != NULL);
|
|
|
|
/*
|
|
* If the data is all zeroes, we don't even need to allocate
|
|
* a block for it. We indicate this by setting *destsizep = 0.
|
|
*/
|
|
allzero = 1;
|
|
word = src;
|
|
word_end = (uint64_t *)(uintptr_t)((uintptr_t)word + srcsize);
|
|
while (word < word_end) {
|
|
if (*word++ != 0) {
|
|
allzero = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (allzero) {
|
|
*destp = NULL;
|
|
*destsizep = 0;
|
|
*destbufsizep = 0;
|
|
return (1);
|
|
}
|
|
|
|
if (cpfunc == ZIO_COMPRESS_EMPTY)
|
|
return (0);
|
|
|
|
/* Compress at least 12.5% */
|
|
destbufsize = P2ALIGN(srcsize - (srcsize >> 3), SPA_MINBLOCKSIZE);
|
|
if (destbufsize == 0)
|
|
return (0);
|
|
dest = zio_buf_alloc(destbufsize);
|
|
|
|
ciosize = ci->ci_compress(src, dest, (size_t)srcsize,
|
|
(size_t)destbufsize, ci->ci_level);
|
|
if (ciosize > destbufsize) {
|
|
zio_buf_free(dest, destbufsize);
|
|
return (0);
|
|
}
|
|
|
|
/* Cool. We compressed at least as much as we were hoping to. */
|
|
|
|
/* For security, make sure we don't write random heap crap to disk */
|
|
gapsize = P2ROUNDUP(ciosize, SPA_MINBLOCKSIZE) - ciosize;
|
|
if (gapsize != 0) {
|
|
bzero(dest + ciosize, gapsize);
|
|
ciosize += gapsize;
|
|
}
|
|
|
|
ASSERT3U(ciosize, <=, destbufsize);
|
|
ASSERT(P2PHASE(ciosize, SPA_MINBLOCKSIZE) == 0);
|
|
*destp = dest;
|
|
*destsizep = ciosize;
|
|
*destbufsizep = destbufsize;
|
|
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
zio_decompress_data(int cpfunc, void *src, uint64_t srcsize,
|
|
void *dest, uint64_t destsize)
|
|
{
|
|
zio_compress_info_t *ci = &zio_compress_table[cpfunc];
|
|
|
|
ASSERT((uint_t)cpfunc < ZIO_COMPRESS_FUNCTIONS);
|
|
|
|
return (ci->ci_decompress(src, dest, srcsize, destsize, ci->ci_level));
|
|
}
|