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

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Message-ID: <4CF7FAD2.9050006@bluewatersys.com>
Date:	Fri, 03 Dec 2010 09:00:18 +1300
From:	Ryan Mallon <ryan@...ewatersys.com>
To:	Charles Manning <cdhmanning@...il.com>
CC:	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 12/01/2010 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.

> +#define TENDSTR "\n"
> +#define TSTR(x) KERN_DEBUG x
> +#define TCONT(x) x
> +#define TOUT(p) printk p
> +
> +#define compile_time_assertion(assertion) \
> +	({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; })

Can you use BUILD_BUG_ON?

> +#ifndef Y_DUMP_STACK
> +#define Y_DUMP_STACK() do { } while (0)
> +#endif

Y_DUMP_STACK is defined above so this ifdef is useless?

> +#ifndef YBUG
> +#define YBUG() do {\
> +	T(YAFFS_TRACE_BUG,\
> +		(TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR),\
> +		__LINE__));\
> +	Y_DUMP_STACK();\
> +} while (0)

This macro name should possibly be changed since its name implies that
it does the same thing as BUG().

~Ryan

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