From db69e0ebae944690de89851315404f483e6464e0 Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Fri, 15 Aug 2008 15:34:14 -0400
Subject: [PATCH] Btrfs: Init address_space->writeback_index properly

The writeback_index field is used by write_cache_pages to pick up where
writeback on a given inode left off.  But, it is never set to a sane
value, so writeback can often start at a random offset in the file.

Kernels 2.6.28 and higher will have this fixed, but for everyone else,
we also fill in the value in btrfs.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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