From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Date: Thu, 16 Oct 2008 14:10:36 +0000 (-0400)
Subject: ext4: Fix file fragmentation during large file write.
X-Git-Tag: v2.6.28-rc1~257^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=22208dedbd7626e5fc4339c417f8d24cc21f79d7;p=pandora-kernel.git

ext4: Fix file fragmentation during large file write.

The range_cyclic writeback mode uses the address_space writeback_index
as the start index for writeback.  With delayed allocation we were
updating writeback_index wrongly resulting in highly fragmented file.
This patch reduces the number of extents reduced from 4000 to 27 for a
3GB file.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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