linux-kernel - Re: [2.6.26 patch] fat_valid

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Message-ID: <20080609080512.GF4048@cs181133002.pp.htv.fi>
Date:	Mon, 9 Jun 2008 11:05:12 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	"H. Peter Anvin" <hpa@...nel.org>, Adrian Bunk <bunk@...nel.org>,
	S.Çağlar Onur <caglar@...dus.org.tr>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frank Seidel <fseidel@...e.de>,
	Onur Küçük <onur@...dus.org.tr>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [2.6.26 patch] fat_valid_media() isn't for userspace

On Mon, Jun 09, 2008 at 01:12:37PM +0900, OGAWA Hirofumi wrote:
> "H. Peter Anvin" <hpa@...nel.org> writes:
> 
> > The other thing about this header that needs to be fixed is the 
> > definition of the following ioctls:
> >
> > #define VFAT_IOCTL_READDIR_BOTH         _IOR('r', 1, struct dirent [2])
> > #define VFAT_IOCTL_READDIR_SHORT        _IOR('r', 2, struct dirent [2])
> >
> > "struct dirent" is a kernel type here, but is a **different type** in 
> > userspace!  This means both the structure and the IOCTL number is wrong!
> >
> > We need to make this either __kernel_dirent_t[*] or something like 
> > struct __msdos_fs_dirent.
> 
> I see. "struct dirent" in linux/dirent.h has very few users in kernel,
> and probably userland doesn't use it, so it seems it should be renamed.
> 
> Well, the patch is like this (sorry, other cleanup is in this patch)?
>...

I wanted to ask whether it could have had any users at all, but at least 
Wine contains a workaround for our bug...

> Thanks.
> 
> > 	-hpa
>...
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
>...

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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