From: Dave Chinner <david@fromorbit.com>
Date: Mon, 6 Apr 2009 16:42:11 +0000 (+0200)
Subject: xfs: prevent unwritten extent conversion from blocking I/O completion
X-Git-Tag: v2.6.30-rc2~68^2^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c626d174cfe38e7f0545d074c299527892cd8c45;p=pandora-kernel.git

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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