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