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Illumos #3035 LZ4 compression support in ZFS and GRUB

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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
This commit is contained in:
Eric Dillmann
2013-01-23 10:54:30 +01:00
committed by Brian Behlendorf
parent ff5b1c8065
commit 9759c60f1a
13 changed files with 1188 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/zio.h
+3
View File
@@ -25,6 +25,7 @@
/*
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2012 by Delphix. All rights reserved.
* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
*/
#ifndef _ZIO_H
@@ -108,6 +109,7 @@ enum zio_compress {
ZIO_COMPRESS_GZIP_8,
ZIO_COMPRESS_GZIP_9,
ZIO_COMPRESS_ZLE,
ZIO_COMPRESS_LZ4,
ZIO_COMPRESS_FUNCTIONS
};
@@ -116,6 +118,7 @@ enum zio_compress {
#define BOOTFS_COMPRESS_VALID(compress) \
((compress) == ZIO_COMPRESS_LZJB || \
(compress) == ZIO_COMPRESS_LZ4 || \
((compress) == ZIO_COMPRESS_ON && \
ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \
(compress) == ZIO_COMPRESS_OFF)
include/sys/zio_compress.h
+10
View File
@@ -53,6 +53,12 @@ typedef struct zio_compress_info {
extern zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS];
/*
* lz4 compression init & free
*/
extern void lz4_init(void);
extern void lz4_fini(void);
/*
* Compression routines.
*/
@@ -68,6 +74,10 @@ extern size_t zle_compress(void *src, void *dst, size_t s_len, size_t d_len,
int level);
extern int zle_decompress(void *src, void *dst, size_t s_len, size_t d_len,
int level);
extern size_t lz4_compress(void *src, void *dst, size_t s_len, size_t d_len,
int level);
extern int lz4_decompress(void *src, void *dst, size_t s_len, size_t d_len,
int level);
/*
* Compress and decompress data if necessary.
include/zfeature_common.h
+2
View File
@@ -21,6 +21,7 @@
/*
* Copyright (c) 2012 by Delphix. All rights reserved.
* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
*/
#ifndef _ZFEATURE_COMMON_H
@@ -52,6 +53,7 @@ typedef int (zfeature_func_t)(zfeature_info_t *fi, void *arg);
typedef enum spa_feature {
SPA_FEATURE_ASYNC_DESTROY,
SPA_FEATURE_EMPTY_BPOBJ,
SPA_FEATURE_LZ4_COMPRESS,
SPA_FEATURES
} spa_feature_t;