From: Chris Mason <chris.mason@oracle.com>
Date: Mon, 22 Nov 2010 03:20:49 +0000 (-0500)
Subject: Btrfs: add migrate page for metadata inode
X-Git-Tag: v2.6.37-rc4~6^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=784b4e29a26617589edd290dd2919735e190c06e;p=pandora-kernel.git

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>
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