Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934342AbXHHQTt (ORCPT ); Wed, 8 Aug 2007 12:19:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759298AbXHHQTc (ORCPT ); Wed, 8 Aug 2007 12:19:32 -0400 Received: from lazybastard.de ([212.112.238.170]:55404 "EHLO longford.lazybastard.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1764277AbXHHQTa (ORCPT ); Wed, 8 Aug 2007 12:19:30 -0400 Date: Wed, 8 Aug 2007 18:15:34 +0200 From: =?utf-8?B?SsO2cm4=?= Engel To: =?utf-8?B?SsO2cm4=?= Engel Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, akpm@osdl.org, David Woodhouse , Arnd Bergmann , Thomas Gleixner Subject: [Patch 04/18] fs/logfs/compr.c Message-ID: <20070808161534.GF15319@lazybastard.org> References: <20070808161234.GB15319@lazybastard.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20070808161234.GB15319@lazybastard.org> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2273 Lines: 103 --- /dev/null 2007-08-05 21:14:35.622844160 +0200 +++ linux-2.6.21logfs/fs/logfs/compr.c 2007-08-08 02:57:37.000000000 +0200 @@ -0,0 +1,95 @@ +/* + * fs/logfs/compr.c - compression routines + * + * As should be obvious for Linux kernel code, license is GPLv2 + * + * Copyright (c) 2005-2007 Joern Engel + */ +#include "logfs.h" +#include +#include + +#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; +} + +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; +} + +int __init logfs_compr_init(void) +{ + size_t size = max(zlib_deflate_workspacesize(), + zlib_inflate_workspacesize()); + stream.workspace = vmalloc(size); + if (!stream.workspace) + return -ENOMEM; + return 0; +} + +void logfs_compr_exit(void) +{ + vfree(stream.workspace); +} - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/