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9759c60f1a
3035 LZ4 compression support in ZFS and GRUB Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Christopher Siden <christopher.siden@delphix.com> Reviewed by: George Wilson <george.wilson@delphix.com> Approved by: Christopher Siden <csiden@delphix.com> References: illumos/illumos-gate@a6f561b4ae https://www.illumos.org/issues/3035 http://wiki.illumos.org/display/illumos/LZ4+Compression+In+ZFS This patch has been slightly modified from the upstream Illumos version to be compatible with Linux. Due to the very limited stack space in the kernel a lz4 workspace kmem cache is used. Since we are using gcc we are also able to take advantage of the gcc optimized __builtin_ctz functions. Support for GRUB has been dropped from this patch. That code is available but those changes will need to made to the upstream GRUB package. Lastly, several hunks of dead code were dropped for clarity. They include the functions real_LZ4_uncompress(), LZ4_compressBound() and the Visual Studio specific hunks wrapped in _MSC_VER. Ported-by: Eric Dillmann <eric@jave.fr> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1217
95 lines
2.8 KiB
C
95 lines
2.8 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 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _SYS_ZIO_COMPRESS_H
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#define _SYS_ZIO_COMPRESS_H
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#include <sys/zio.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Common signature for all zio compress/decompress functions.
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*/
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typedef size_t zio_compress_func_t(void *src, void *dst,
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size_t s_len, size_t d_len, int);
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typedef int zio_decompress_func_t(void *src, void *dst,
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size_t s_len, size_t d_len, int);
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/*
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* Information about each compression function.
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*/
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typedef struct zio_compress_info {
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zio_compress_func_t *ci_compress; /* compression function */
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zio_decompress_func_t *ci_decompress; /* decompression function */
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int ci_level; /* level parameter */
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char *ci_name; /* algorithm name */
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} zio_compress_info_t;
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extern zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS];
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/*
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* lz4 compression init & free
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*/
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extern void lz4_init(void);
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extern void lz4_fini(void);
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/*
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* Compression routines.
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*/
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extern size_t lzjb_compress(void *src, void *dst, size_t s_len, size_t d_len,
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int level);
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extern int lzjb_decompress(void *src, void *dst, size_t s_len, size_t d_len,
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int level);
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extern size_t gzip_compress(void *src, void *dst, size_t s_len, size_t d_len,
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int level);
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extern int gzip_decompress(void *src, void *dst, size_t s_len, size_t d_len,
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int level);
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extern size_t zle_compress(void *src, void *dst, size_t s_len, size_t d_len,
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int level);
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extern int zle_decompress(void *src, void *dst, size_t s_len, size_t d_len,
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int level);
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extern size_t lz4_compress(void *src, void *dst, size_t s_len, size_t d_len,
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int level);
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extern int lz4_decompress(void *src, void *dst, size_t s_len, size_t d_len,
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int level);
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/*
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* Compress and decompress data if necessary.
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*/
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extern size_t zio_compress_data(enum zio_compress c, void *src, void *dst,
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size_t s_len);
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extern int zio_decompress_data(enum zio_compress c, void *src, void *dst,
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size_t s_len, size_t d_len);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_ZIO_COMPRESS_H */
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