cregit-Linux how code gets into the kernel

Release 4.7 fs/logfs/compr.c

Directory: fs/logfs
/*
 * 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

PersonTokensPropCommitsCommitProp
joern engeljoern engel156100.00%1100.00%
Total156100.00%1100.00%


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

PersonTokensPropCommitsCommitProp
joern engeljoern engel139100.00%1100.00%
Total139100.00%1100.00%


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

PersonTokensPropCommitsCommitProp
joern engeljoern engel4289.36%150.00%
james kenistonjames keniston510.64%150.00%
Total47100.00%2100.00%


void logfs_compr_exit(void) { vfree(stream.workspace); }

Contributors

PersonTokensPropCommitsCommitProp
joern engeljoern engel14100.00%1100.00%
Total14100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
joern engeljoern engel37698.69%150.00%
james kenistonjames keniston51.31%150.00%
Total381100.00%2100.00%
Directory: fs/logfs
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