tree baeaabbe0a10d903ba3e0d6ff90ae9934912fc21
parent d313d7a31a752c88f7288692bd98e66d0789779b
author Chris Mason <chris.mason@oracle.com> 1240257009 -0400
committer Chris Mason <chris.mason@oracle.com> 1240257189 -0400

Btrfs: fix oops on page->mapping->host during writepage

The extent_io writepage call updates the writepage index in the inode
as it makes progress.  But, it was doing the update after unlocking the page,
which isn't legal because page->mapping can't be trusted once the page
is unlocked.

This lead to an oops, especially common with compression turned on.  The
fix here is to update the writeback index before unlocking the page.

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