tree 1c1806afb3aa5a7f82b272b8b38dc1e13e45d16b
parent 6418c96107a2b399848bb8cfc6e29f11ca74fb94
author Chris Mason <chris.mason@oracle.com> 1290396049 -0500
committer Chris Mason <chris.mason@oracle.com> 1290396362 -0500

Btrfs: add migrate page for metadata inode

Migrate page will directly call the btrfs btree writepage function,
which isn't actually allowed.

Our writepage assumes that you have locked the extent_buffer and
flagged the block as written.  Without doing these steps, we can
corrupt metadata blocks.

A later commit will remove the btree writepage function since
it is really only safely used internally by btrfs.  We
use writepages for everything else.

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