linux-kernel - Re: [PATCH 7/8] Add yaffs2 file system: verification code and other headers

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Date:	Mon, 06 Dec 2010 10:45:44 +1300
From:	Ryan Mallon <ryan@...ewatersys.com>
To:	Charles Manning <manningc2@...rix.gen.nz>
CC:	Charles Manning <cdhmanning@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/8] Add yaffs2 file system: verification code and other
 headers

On 12/06/2010 10:20 AM, Charles Manning wrote:
> On Friday 03 December 2010 09:00:18 Ryan Mallon wrote:
>> On 12/01/2010 10:57 AM, Charles Manning wrote:
>>> Signed-off-by: Charles Manning <cdhmanning@...il.com>
>>> ---
>>
>> <snip>
>>
>>> diff --git a/fs/yaffs2/yportenv.h b/fs/yaffs2/yportenv.h
>>> new file mode 100644
>>> index 0000000..8fd0da5
>>> --- /dev/null
>>> +++ b/fs/yaffs2/yportenv.h
>>> @@ -0,0 +1,91 @@
>>> +/*
>>> + * YAFFS: Yet another Flash File System . A NAND-flash specific file
>>> system. + *
>>> + * Copyright (C) 2002-2010 Aleph One Ltd.
>>> + *   for Toby Churchill Ltd and Brightstar Engineering
>>> + *
>>> + * Created by Charles Manning <charles@...ph1.co.uk>
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU Lesser General Public License version
>>> 2.1 as + * published by the Free Software Foundation.
>>> + *
>>> + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
>>> + */
>>> +
>>> +#ifndef __YPORTENV_LINUX_H__
>>> +#define __YPORTENV_LINUX_H__
>>> +
>>> +#include <linux/version.h>
>>> +#include <linux/kernel.h>
>>> +#include <linux/mm.h>
>>> +#include <linux/sched.h>
>>> +#include <linux/string.h>
>>> +#include <linux/slab.h>
>>> +#include <linux/vmalloc.h>
>>> +#include <linux/xattr.h>
>>> +#include <linux/list.h>
>>> +#include <linux/types.h>
>>> +#include <linux/fs.h>
>>> +#include <linux/stat.h>
>>> +#include <linux/sort.h>
>>> +#include <linux/bitops.h>
>>> +
>>> +#define YCHAR char
>>> +#define YUCHAR unsigned char
>>> +#define _Y(x)     x
>>> +#define yaffs_strcat(a, b)     strcat(a, b)
>>> +#define yaffs_strcpy(a, b)     strcpy(a, b)
>>> +#define yaffs_strncpy(a, b, c) strncpy(a, b, c)
>>> +#define yaffs_strncmp(a, b, c) strncmp(a, b, c)
>>> +#define yaffs_strnlen(s,m)	strnlen(s,m)
>>> +#define yaffs_sprintf	       sprintf
>>> +#define yaffs_toupper(a)       toupper(a)
>>> +#define yaffs_sort(base, n, sz, cmp_fn)	sort(base, n, sz, cmp_fn, NULL)
>>> +
>>> +#define Y_INLINE __inline__
>>> +
>>> +#define YAFFS_LOSTNFOUND_NAME		"lost+found"
>>> +#define YAFFS_LOSTNFOUND_PREFIX		"obj"
>>> +
>>> +#define YMALLOC(x) kmalloc(x, GFP_NOFS)
>>> +#define YFREE(x)   kfree(x)
>>> +#define YMALLOC_ALT(x) vmalloc(x)
>>> +#define YFREE_ALT(x)   vfree(x)
>>> +#define YMALLOC_DMA(x) YMALLOC(x)
>>> +
>>> +#define YYIELD() schedule()
>>> +#define Y_DUMP_STACK() dump_stack()
>>> +
>>> +#define YAFFS_ROOT_MODE			0755
>>> +#define YAFFS_LOSTNFOUND_MODE		0700
>>> +
>>> +#define Y_CURRENT_TIME CURRENT_TIME.tv_sec
>>> +#define Y_TIME_CONVERT(x) (x).tv_sec
>>> +
>>> +#define yaffs_sum_cmp(x, y) ((x) == (y))
>>> +#define yaffs_strcmp(a, b) strcmp(a, b)
>>
>> You should try and remove the wrappers for as many of these as possible.
>> I know the wrappers are there for portability to other operating
>> systems, but for mainlining in Linux it makes the code more complex.
> 
> Thus far I have tried to keep all the code directly compilable for WinCE and 
> Linux.
> 
> I did some investigation over the weekend and I am pretty sure that if I 
> preserve just a few of these macros, YCHAR in particular, I can eliminate 
> almost everything else and just run the code through a sed script to generate 
> the WiNCE version.

Could YCHAR and YUCHAR be replaced by s8 and u8?

~Ryan

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