linux-kernel - Re: [PATCH 0/2] vfs: ensure that dentries are revalidated on open (try #2)

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Message-ID: <20091118041906.GB1395@ucw.cz>
Date:	Wed, 18 Nov 2009 05:19:06 +0100
From:	Pavel Machek <pavel@....cz>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org, ebiederm@...ssion.com,
	adobriyan@...il.com, viro@...IV.linux.org.uk, jamie@...reable.org
Subject: Re: [PATCH 0/2] vfs: ensure that dentries are revalidated on open
	(try #2)

Hi!

> This is the second attempt to fix this problem. The first one attempted
> to fix this in procfs, but Eric Biederman pointed out that file bind
> mounts have a similar problem. This set attempts to fix the issue at a
> higher level, in the generic VFS layer.
> 
> In certain situations, when it knows that they are valid, the path
> walking code will skip revalidating dentries that it finds in the cache.
> This causes problems with filesystems such as NFSv4 and CIFS that depend
> on the d_revalidate routine to do opens during lookup.

...and it allows bypassing directory permissions. Could we fix both
here?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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