From c626d174cfe38e7f0545d074c299527892cd8c45 Mon Sep 17 00:00:00 2001
From: Dave Chinner <david@fromorbit.com>
Date: Mon, 6 Apr 2009 18:42:11 +0200
Subject: [PATCH] xfs: prevent unwritten extent conversion from blocking I/O
 completion

Unwritten extent conversion can recurse back into the filesystem due
to memory allocation. Memory reclaim requires I/O completions to be
processed to allow the callers to make progress. If the I/O
completion workqueue thread is doing the recursion, then we have a
deadlock situation.

Move unwritten extent completion into it's own workqueue so it
doesn't block I/O completions for normal delayed allocation or
overwrite data.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
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