From: Dave Chinner <dchinner@redhat.com>
Date: Thu, 27 Jan 2011 01:17:58 +0000 (+1100)
Subject: xfs: prevent extsize alignment from exceeding maximum extent size
X-Git-Tag: v2.6.38-rc3~5^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4ce159890c00e2cc705e955a939bf1dca7b07ab8;p=pandora-kernel.git

xfs: prevent extsize alignment from exceeding maximum extent size

When doing delayed allocation, if the allocation size is for a
maximally sized extent, extent size alignment can push it over this
limit. This results in an assert failure in xfs_bmbt_set_allf() as
the extent length is too large to find in the extent record.

Fix this by ensuring that we allow for space that extent size
alignment requires (up to 2 * (extsize -1) blocks as we have to
handle both head and tail alignment) when limiting the maximum size
of the extent.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
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