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

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Message-ID: <49FF1A7F.4010307@suse.com>
Date:	Mon, 04 May 2009 12:40:31 -0400
From:	Jeff Mahoney <jeffm@...e.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ReiserFS Mailing List <reiserfs-devel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@....linux.org.uk>,
	Alexander Beregalov <a.beregalov@...il.com>,
	David <david@...olicited.net>
Subject: Re: [PATCH] reiserfs: Expand i_mutex to enclose lookup_one_len

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Al Viro wrote:
> On Mon, May 04, 2009 at 12:51:20AM -0400, Jeff Mahoney wrote:
> 
>> Huh. I didn't see that still in there. That's an artifact of an earlier
>> version of the code where I kept a reference to /.reiserfs_priv/xattrs.
>> Then I decided that .reiserfs_priv was all I needed to cache (to avoid
>> recursive i_mutex locking on the fs root) and dropped the caching of
>> xattrs. Looks like it didn't get totally cleared out.
> 
> It's not that simple ;-/  You check it in journalling code, AFAICS in order
> to decide how much will that sucker take (due to extra mkdir?) and something
> will need to be done with that check.

Yes, it's for an extra mkdir. Now that I've gotten some sleep and looked
at the code again, I see what you're saying. At least it's broken in a
performance way instead of causing a system crash or data corruption.

> Anyway, I'm going to push all that stuff to #for-next, so that -next would
> pick it.  I have *not* touched the xattr_root logics, so if you could do
> that on top of your patch + my incremental...

Ok, I'll fix that up and get some testing in.

- -Jeff


- --
Jeff Mahoney
SUSE Labs
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