From: David Chinner <dgc@sgi.com>
Date: Fri, 23 Nov 2007 05:29:11 +0000 (+1100)
Subject: [XFS] Fix transaction overrun during writeback.
X-Git-Tag: v2.6.25-rc1~282^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e4143a1cf5973e3443c0650fc4c35292d3b7baa8;p=pandora-kernel.git

[XFS] Fix transaction overrun during writeback.

Prevent transaction overrun in xfs_iomap_write_allocate() if we race with
a truncate that overlaps the delalloc range we were planning to allocate.

If we race, we may allocate into a hole and that requires block
allocation. At this point in time we don't have a reservation for block
allocation (apart from metadata blocks) and so allocating into a hole
rather than a delalloc region results in overflowing the transaction block
reservation.

Fix it by only allowing a single extent to be allocated at a time.

SGI-PV: 972757
SGI-Modid: xfs-linux-melb:xfs-kern:30005a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
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