linux-kernel - Re: [PATCH] d_ino considered harmful

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Message-Id: <201006162110.43322.arnd@arndb.de>
Date:	Wed, 16 Jun 2010 21:10:42 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Valerie Aurora <vaurora@...hat.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	Jan Blunck <jblunck@...e.de>,
	Jamie Lokier <jamie@...reable.org>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] d_ino considered harmful

On Wednesday 16 June 2010 20:59:13 Valerie Aurora wrote:
> @@ -91,7 +91,9 @@ static int fillonedir(void * __buf, const char * name, int namlen, loff_t offset
>  
>         if (buf->result)
>                 return -EINVAL;
> -       d_ino = ino;
> +       /* Use of d_ino without st_dev is always buggy. */
> +       d_ino = 0;
> +
>         if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
>                 buf->result = -EOVERFLOW;
>                 return -EOVERFLOW;

Isn't this just the path taken by sys_oldreaddir?

Glibc (at least on my box) translates all user calls to readdir into
sys_getdents or sys_getdents64, so I think you'd also need to change
filldir() and filldir64() for your testing.

	Arnd
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