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

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Message-ID: <49FB5D4F.5090600@suse.com>
Date:	Fri, 01 May 2009 16:36:31 -0400
From:	Jeff Mahoney <jeffm@...e.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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

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Andrew Morton wrote:
> 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?

Yes.

>>  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/ ;)

Yeah, that's more accurate. :)

- -Jeff

- --
Jeff Mahoney
SUSE Labs
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