linux-kernel - Re: [PATCH] reiserfs: Expand i_mutex to enclose lookup_one

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Date:	Fri, 1 May 2009 12:56:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jeff Mahoney <jeffm@...e.com>
Cc:	linux-kernel@...r.kernel.org, reiserfs-devel@...r.kernel.org,
	viro@....linux.org.uk, a.beregalov@...il.com,
	david@...olicited.net, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [PATCH] reiserfs: Expand i_mutex to enclose lookup_one_len

On Fri, 01 May 2009 12:11:12 -0400
Jeff Mahoney <jeffm@...e.com> wrote:

>  2.6.30-rc3 introduced some sanity checks in the VFS code to avoid NFS
>  bugs by ensuring that lookup_one_len is always called under i_mutex.
> 
>  This patch expands the i_mutex locking to enclose lookup_one_len. This was
>  always required, but not not enforced in the reiserfs code since it
>  does locking around the xattr interactions with the xattr_sem.

cool, so this will fix all those backtraces people have been reporting
coming out of the reiserfs xattr code lately?

>  This is obvious enough, but it survived an overnight 50 thread ACL test.

That sounds a bit pessimistic.  I think I'll s/but/and/ ;)
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