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infra: exploit new lz4 interface

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This commit is contained in:
Thomas Schoebel-Theuer 2019-08-05 14:28:05 +02:00 committed by Thomas Schoebel-Theuer
parent 8daeadb061
commit 6e55a6da95
2 changed files with 36 additions and 1 deletions
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5
kernel/compat.h
View File

@ -241,6 +241,11 @@ extern int _compat_unlink(
(defined(CONFIG_LZ4_DECOMPRESS) || defined(CONFIG_LZ4_DECOMPRESS_MODULE))
#include <linux/lz4.h>
#define HAS_LZ4
/* adapt to 4e1a33b105ddf201f66dcc44490c6086a25eca0b
*/
#ifdef LZ4_ACCELERATION_DEFAULT
#define HAS_FAST_LZ4
#endif
#endif
#endif /* _MARS_COMPAT */

32
kernel/mars_generic.c
View File

@ -713,7 +713,11 @@ int mars_compress(void *src_data,
#endif
#ifdef HAS_LZ4
if (check_flags & MREF_COMPRESS_LZ4) {
#ifdef HAS_FAST_LZ4
size_t max_len = LZ4_COMPRESSBOUND(src_len);
#else
size_t max_len = lz4_compressbound(src_len);
#endif
size_t res_len = 0;
void *wrkmem;
int status;
@ -728,9 +732,19 @@ int mars_compress(void *src_data,
wrkmem = brick_block_alloc(0, LZ4_MEM_COMPRESS);
#ifdef HAS_FAST_LZ4
res_len = LZ4_compress_fast(src_data,
tmp_buf,
src_len,
max_len,
LZ4_ACCELERATION_DEFAULT,
wrkmem);
status = 0;
#else
status = lz4_compress(src_data, src_len,
tmp_buf, &res_len,
wrkmem);
#endif
if (likely(!status && res_len > 0 && res_len < src_len)) {
used_compression = MREF_COMPRESS_LZ4;
*result_flags |= MREF_COMPRESS_LZ4;
@ -783,8 +797,19 @@ void *mars_decompress(void *src_data,
#ifdef HAS_LZ4
if (check_flags & MREF_COMPRESS_LZ4) {
size_t new_len = src_len;
int status;
int status = 0;
#ifdef HAS_FAST_LZ4
new_len = LZ4_decompress_safe(src_data,
res_buf,
src_len,
dst_len);
if (!status && new_len == dst_len)
goto done;
MARS_ERR("bad LZ4 decompression %d to %lu != %d bytes\n",
src_len, new_len, dst_len);
#else
status = lz4_decompress(src_data, &new_len,
res_buf, dst_len);
if (!status && new_len == src_len)
@ -792,6 +817,7 @@ void *mars_decompress(void *src_data,
MARS_ERR("bad LZ4 decompression %d != %lu to %d bytes\n",
src_len, new_len, dst_len);
#endif
goto err;
}
#endif
@ -867,7 +893,11 @@ int init_mars_compress(void)
compress_overhead = max_len;
#endif
#ifdef HAS_LZ4
#ifdef HAS_FAST_LZ4
max_len = LZ4_COMPRESSBOUND(MARS_MAX_COMPR_SIZE) - MARS_MAX_COMPR_SIZE;
#else
max_len = lz4_compressbound(MARS_MAX_COMPR_SIZE) - MARS_MAX_COMPR_SIZE;
#endif
if (max_len > compress_overhead)
compress_overhead = max_len;
#endif