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-   -   Add compression processing (http://www.linux-archive.org/crash-utility/679546-add-compression-processing.html)

HATAYAMA Daisuke 07-03-2012 03:07 AM

Add compression processing
 
Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
---

makedumpfile.c | 30 +++++++++++++++++++++++++-----
makedumpfile.h | 3 +++
2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/makedumpfile.c b/makedumpfile.c
index a47a3ec..1525b30 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -4718,6 +4718,7 @@ write_kdump_pages(struct cache_data *cd_header, struct cache_data *cd_page)
struct dump_bitmap bitmap2;
struct timeval tv_start;
const off_t failed = (off_t)-1;
+ unsigned long len_buf_out_zlib, len_buf_out_lzo, len_buf_out_snappy;

int ret = FALSE;

@@ -4726,8 +4727,9 @@ write_kdump_pages(struct cache_data *cd_header, struct cache_data *cd_page)

initialize_2nd_bitmap(&bitmap2);

+ len_buf_out_zlib = len_buf_out_lzo = len_buf_out_snappy = 0;
+
#ifdef USELZO
- unsigned long len_buf_out_zlib, len_buf_out_lzo;
lzo_bytep wrkmem;

if ((wrkmem = malloc(LZO1X_1_MEM_COMPRESS)) == NULL) {
@@ -4736,13 +4738,19 @@ write_kdump_pages(struct cache_data *cd_header, struct cache_data *cd_page)
goto out;
}

- len_buf_out_zlib = compressBound(info->page_size);
len_buf_out_lzo = info->page_size + info->page_size / 16 + 64 + 3;
- len_buf_out = MAX(len_buf_out_zlib, len_buf_out_lzo);
-#else
- len_buf_out = compressBound(info->page_size);
#endif

+#ifdef USESNAPPY
+ len_buf_out_snappy = snappy_max_compressed_length(info->page_size);
+#endif
+
+ len_buf_out_zlib = compressBound(info->page_size);
+
+ len_buf_out = MAX(len_buf_out_zlib,
+ MAX(len_buf_out_lzo,
+ len_buf_out_snappy));
+
if ((buf_out = malloc(len_buf_out)) == NULL) {
ERRMSG("Can't allocate memory for the compression buffer. %s
",
strerror(errno));
@@ -4843,6 +4851,18 @@ write_kdump_pages(struct cache_data *cd_header, struct cache_data *cd_page)
pd.size = size_out;
memcpy(buf, buf_out, pd.size);
#endif
+#ifdef USESNAPPY
+ } else if ((info->flag_compress & DUMP_DH_COMPRESSED_SNAPPY)
+ && ((size_out = len_buf_out_snappy),
+ snappy_compress((char *)buf, info->page_size,
+ (char *)buf_out,
+ (size_t *)&size_out)
+ == SNAPPY_OK)
+ && (size_out < info->page_size)) {
+ pd.flags = DUMP_DH_COMPRESSED_SNAPPY;
+ pd.size = size_out;
+ memcpy(buf, buf_out, pd.size);
+#endif
} else {
pd.flags = 0;
pd.size = info->page_size;
diff --git a/makedumpfile.h b/makedumpfile.h
index 6f5489d..72d8327 100644
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -34,6 +34,9 @@
#ifdef USELZO
#include <lzo/lzo1x.h>
#endif
+#ifdef USESNAPPY
+#include <snappy-c.h>
+#endif
#include "common.h"
#include "dwarf_info.h"
#include "diskdump_mod.h"

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