From: Yan <yanzheng@21cn.com>
Date: Mon, 29 Oct 2007 15:41:07 +0000 (-0400)
Subject: Fix inline extent handling in btrfs_get_extent
X-Git-Tag: v2.6.29-rc1~27^2~9^2~55^2~56^2~30^2~431
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=689f9346612d96ab93890160cf2fe0df5217ab73;p=pandora-kernel.git

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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