tree 2c95462bfc86b0ab34d3ee1ab5675b060d896430
parent 2db04966ae9a3eeb57f28df9aac4e77d5b287cb1
author Chris Mason <chris.mason@oracle.com> 1218828854 -0400
committer Chris Mason <chris.mason@oracle.com> 1222355046 -0400

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>