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

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Date:	Mon, 6 Dec 2010 10:20:36 +1300
From:	Charles Manning <manningc2@...rix.gen.nz>
To:	Ryan Mallon <ryan@...ewatersys.com>
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 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.

I'll do that for the next release.

Charles
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