linux-kernel - Re: [PATCH] xfs: revert to double-buffering readdir

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Message-ID: <20071127194314.GA4939@puku.stupidest.org>
Date:	Tue, 27 Nov 2007 11:43:14 -0800
From:	Chris Wedgwood <cw@...f.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-xfs@....sgi.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xfs: revert to double-buffering readdir

On Sun, Nov 25, 2007 at 04:30:14PM +0000, Christoph Hellwig wrote:

> The current readdir implementation deadlocks on a btree buffers
> locks because nfsd calls back into ->lookup from the filldir
> callback.  The only short-term fix for this is to revert to the old
> inefficient double-buffering scheme.

This seems to work really well here.

> This patch does exactly that and reverts xfs_file_readdir to what's
> basically the 2.6.23 version minus the uio and vnops junk.

This should probably be submitted for inclusion stable-2.6.24.
Perhaps a version with the #if 0 [...]  stuff dropped?  (I'm happy to
send a patch for that if you prefer).
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