From 689f9346612d96ab93890160cf2fe0df5217ab73 Mon Sep 17 00:00:00 2001
From: Yan <yanzheng@21cn.com>
Date: Mon, 29 Oct 2007 11:41:07 -0400
Subject: [PATCH] Fix inline extent handling in btrfs_get_extent

1.  Reorder kmap and the test for  'page != NULL'
2.  Zero-fill rest area of a block when inline extent isn't big enough.
3.  Do not insert extent_map into the map tree when page == NULL.
(If insert the extent_map into the map tree,  subsequent read requests
will find it in the map tree directly and the corresponding inline
extent data aren't copied into page by the the get_extent function.
extent_read_full_page can't handle that case)

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