Release 4.7 fs/logfs/compr.c
/*
* fs/logfs/compr.c - compression routines
*
* As should be obvious for Linux kernel code, license is GPLv2
*
* Copyright (c) 2005-2008 Joern Engel <joern@logfs.org>
*/
#include "logfs.h"
#include <linux/vmalloc.h>
#include <linux/zlib.h>
#define COMPR_LEVEL 3
static DEFINE_MUTEX(compr_mutex);
static struct z_stream_s stream;
int logfs_compress(void *in, void *out, size_t inlen, size_t outlen)
{
int err, ret;
ret = -EIO;
mutex_lock(&compr_mutex);
err = zlib_deflateInit(&stream, COMPR_LEVEL);
if (err != Z_OK)
goto error;
stream.next_in = in;
stream.avail_in = inlen;
stream.total_in = 0;
stream.next_out = out;
stream.avail_out = outlen;
stream.total_out = 0;
err = zlib_deflate(&stream, Z_FINISH);
if (err != Z_STREAM_END)
goto error;
err = zlib_deflateEnd(&stream);
if (err != Z_OK)
goto error;
if (stream.total_out >= stream.total_in)
goto error;
ret = stream.total_out;
error:
mutex_unlock(&compr_mutex);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| joern engel | joern engel | 156 | 100.00% | 1 | 100.00% |
| Total | 156 | 100.00% | 1 | 100.00% |
int logfs_uncompress(void *in, void *out, size_t inlen, size_t outlen)
{
int err, ret;
ret = -EIO;
mutex_lock(&compr_mutex);
err = zlib_inflateInit(&stream);
if (err != Z_OK)
goto error;
stream.next_in = in;
stream.avail_in = inlen;
stream.total_in = 0;
stream.next_out = out;
stream.avail_out = outlen;
stream.total_out = 0;
err = zlib_inflate(&stream, Z_FINISH);
if (err != Z_STREAM_END)
goto error;
err = zlib_inflateEnd(&stream);
if (err != Z_OK)
goto error;
ret = 0;
error:
mutex_unlock(&compr_mutex);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| joern engel | joern engel | 139 | 100.00% | 1 | 100.00% |
| Total | 139 | 100.00% | 1 | 100.00% |
int __init logfs_compr_init(void)
{
size_t size = max(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
zlib_inflate_workspacesize());
stream.workspace = vmalloc(size);
if (!stream.workspace)
return -ENOMEM;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| joern engel | joern engel | 42 | 89.36% | 1 | 50.00% |
| james keniston | james keniston | 5 | 10.64% | 1 | 50.00% |
| Total | 47 | 100.00% | 2 | 100.00% |
void logfs_compr_exit(void)
{
vfree(stream.workspace);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| joern engel | joern engel | 14 | 100.00% | 1 | 100.00% |
| Total | 14 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| joern engel | joern engel | 376 | 98.69% | 1 | 50.00% |
| james keniston | james keniston | 5 | 1.31% | 1 | 50.00% |
| Total | 381 | 100.00% | 2 | 100.00% |
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