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pstore: Add lz4hc and 842 compression support

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Currently, pstore has supported three compression algorithms: zlib,
lzo and lz4. This patch added two more compression algorithms: lz4hc
and 842.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
[kees: tweaked Kconfig help text slightly]
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Geliang Tang 2018-02-13 14:40:39 +08:00 committed by Kees Cook
parent 91ab883eb2
commit 239b716199
2 changed files with 153 additions and 22 deletions
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20
fs/pstore/Kconfig
View File

@ -19,6 +19,11 @@ choice
help
This option chooses compression algorithm.
Currently, pstore has support for 5 compression algorithms:
zlib, lzo, lz4, lz4hc and 842.
The default compression algorithm is zlib.
config PSTORE_ZLIB_COMPRESS
bool "ZLIB"
select ZLIB_DEFLATE
@ -39,6 +44,21 @@ config PSTORE_LZ4_COMPRESS
select LZ4_DECOMPRESS
help
This option enables LZ4 compression algorithm support.
config PSTORE_LZ4HC_COMPRESS
bool "LZ4HC"
select LZ4HC_COMPRESS
select LZ4_DECOMPRESS
help
This option enables LZ4HC (high compression) mode algorithm.
config PSTORE_842_COMPRESS
bool "842"
select 842_COMPRESS
select 842_DECOMPRESS
help
This option enables 842 compression algorithm support.
endchoice
config PSTORE_CONSOLE

155
fs/pstore/platform.c
View File

@ -34,9 +34,12 @@
#ifdef CONFIG_PSTORE_LZO_COMPRESS
#include <linux/lzo.h>
#endif
#ifdef CONFIG_PSTORE_LZ4_COMPRESS
#if defined(CONFIG_PSTORE_LZ4_COMPRESS) || defined(CONFIG_PSTORE_LZ4HC_COMPRESS)
#include <linux/lz4.h>
#endif
#ifdef CONFIG_PSTORE_842_COMPRESS
#include <linux/sw842.h>
#endif
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/slab.h>
@ -336,20 +339,7 @@ static const struct pstore_zbackend backend_lzo = {
};
#endif
#ifdef CONFIG_PSTORE_LZ4_COMPRESS
static int compress_lz4(const void *in, void *out, size_t inlen, size_t outlen)
{
int ret;
ret = LZ4_compress_default(in, out, inlen, outlen, workspace);
if (!ret) {
pr_err("LZ4_compress_default error; compression failed!\n");
return -EIO;
}
return ret;
}
#if defined(CONFIG_PSTORE_LZ4_COMPRESS) || defined(CONFIG_PSTORE_LZ4HC_COMPRESS)
static int decompress_lz4(void *in, void *out, size_t inlen, size_t outlen)
{
int ret;
@ -367,6 +357,29 @@ static int decompress_lz4(void *in, void *out, size_t inlen, size_t outlen)
return ret;
}
static void free_lz4(void)
{
kfree(workspace);
kfree(big_oops_buf);
big_oops_buf = NULL;
big_oops_buf_sz = 0;
}
#endif
#ifdef CONFIG_PSTORE_LZ4_COMPRESS
static int compress_lz4(const void *in, void *out, size_t inlen, size_t outlen)
{
int ret;
ret = LZ4_compress_default(in, out, inlen, outlen, workspace);
if (!ret) {
pr_err("LZ4_compress_default error; compression failed!\n");
return -EIO;
}
return ret;
}
static void allocate_lz4(void)
{
big_oops_buf_sz = LZ4_compressBound(psinfo->bufsize);
@ -384,7 +397,101 @@ static void allocate_lz4(void)
}
}
static void free_lz4(void)
static const struct pstore_zbackend backend_lz4 = {
.compress = compress_lz4,
.decompress = decompress_lz4,
.allocate = allocate_lz4,
.free = free_lz4,
.name = "lz4",
};
#endif
#ifdef CONFIG_PSTORE_LZ4HC_COMPRESS
static int compress_lz4hc(const void *in, void *out,
size_t inlen, size_t outlen)
{
int ret;
ret = LZ4_compress_HC(in, out, inlen, outlen,
LZ4HC_DEFAULT_CLEVEL, workspace);
if (!ret) {
pr_err("LZ4_compress_HC error; compression failed!\n");
return -EIO;
}
return ret;
}
static void allocate_lz4hc(void)
{
big_oops_buf_sz = LZ4_compressBound(psinfo->bufsize);
big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
if (big_oops_buf) {
workspace = kmalloc(LZ4HC_MEM_COMPRESS, GFP_KERNEL);
if (!workspace) {
pr_err("No memory for compression workspace; skipping compression\n");
kfree(big_oops_buf);
big_oops_buf = NULL;
}
} else {
pr_err("No memory for uncompressed data; skipping compression\n");
workspace = NULL;
}
}
static const struct pstore_zbackend backend_lz4hc = {
.compress = compress_lz4hc,
.decompress = decompress_lz4,
.allocate = allocate_lz4hc,
.free = free_lz4,
.name = "lz4hc",
};
#endif
#ifdef CONFIG_PSTORE_842_COMPRESS
static int compress_842(const void *in, void *out, size_t inlen, size_t outlen)
{
int ret;
ret = sw842_compress(in, inlen, out, (unsigned int *)&outlen, workspace);
if (ret) {
pr_err("sw842_compress error; compression failed!\n");
return ret;
}
return outlen;
}
static int decompress_842(void *in, void *out, size_t inlen, size_t outlen)
{
int ret;
ret = sw842_decompress(in, inlen, out, (unsigned int *)&outlen);
if (ret) {
pr_err("sw842_decompress error, ret = %d!\n", ret);
return ret;
}
return outlen;
}
static void allocate_842(void)
{
big_oops_buf_sz = psinfo->bufsize;
big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
if (big_oops_buf) {
workspace = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
if (!workspace) {
kfree(big_oops_buf);
big_oops_buf = NULL;
}
} else {
pr_err("No memory for uncompressed data; skipping compression\n");
workspace = NULL;
}
}
static void free_842(void)
{
kfree(workspace);
kfree(big_oops_buf);
@ -392,12 +499,12 @@ static void free_lz4(void)
big_oops_buf_sz = 0;
}
static const struct pstore_zbackend backend_lz4 = {
.compress = compress_lz4,
.decompress = decompress_lz4,
.allocate = allocate_lz4,
.free = free_lz4,
.name = "lz4",
static const struct pstore_zbackend backend_842 = {
.compress = compress_842,
.decompress = decompress_842,
.allocate = allocate_842,
.free = free_842,
.name = "842",
};
#endif
@ -408,6 +515,10 @@ static const struct pstore_zbackend *zbackend =
&backend_lzo;
#elif defined(CONFIG_PSTORE_LZ4_COMPRESS)
&backend_lz4;
#elif defined(CONFIG_PSTORE_LZ4HC_COMPRESS)
&backend_lz4hc;
#elif defined(CONFIG_PSTORE_842_COMPRESS)
&backend_842;
#else
NULL;
#endif