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

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Message-Id: <E1N88eK-0006Im-1F@pomaz-ex.szeredi.hu>
Date:	Wed, 11 Nov 2009 09:33:56 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Trond Myklebust <trond.myklebust@....uio.no>
CC:	miklos@...redi.hu, jlayton@...hat.com,
	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)

On Wed, 11 Nov 2009, Trond Myklebust wrote:
> > Having said that, doing revalidation for proc symlinks and bind mounts
> > (and not just for opens) might make sense.  This is something similar
> > to FS_REVAL_DOT, so perhaps make it conditional on this flag (or a
> > new, appropriately named one).
> 
> Aren't both proc symlinks and bind mounts pretty much guaranteed to
> point to a valid dentry?

It could for example happen that client bind mounts a regular file,
then the file is unlinked on the server.  Then the bind mounted dentry
is no longer valid.

Thanks,
Miklos
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