linux-kernel - Re: [PATCH] xattr: Fix error results for non-existent / invisible attributes

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Message-ID: <20110620080921.GA23159@infradead.org>
Date:	Mon, 20 Jun 2011 04:09:21 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Andreas Gruenbacher <agruen@...nel.org>
Cc:	Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] xattr: Fix error results for non-existent / invisible
 attributes

On Fri, May 27, 2011 at 02:50:36PM +0200, Andreas Gruenbacher wrote:
> Return -ENODATA when trying to read a user.* attribute which cannot
> exist: user space otherwise does not have a reasonable way to
> distinguish between non-existent and inaccessible attributes.
> 
> Likewise, return -ENODATA when an unprivileged process tries to read a
> trusted.* attribute: to unprivileged processes, those attributes are
> invisible (listxattr() won't include them).

This breaks xfstests 062.  It would also be very useful to send VFS
patches to linux-fsdevel, btw.

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