From: Li Zefan <lizf@cn.fujitsu.com>
Date: Wed, 26 Jan 2011 06:10:43 +0000 (+0800)
Subject: Btrfs: Fix file clone when source offset is not 0
X-Git-Tag: v2.6.38-rc4~2^2~21^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4d728ec7aefdca5419d2ebfb28c147e81a4b59f4;p=pandora-kernel.git

Btrfs: Fix file clone when source offset is not 0

Suppose:
- the source extent is: [0, 100]
- the src offset is 10
- the clone length is 90
- the dest offset is 0

This statement:

	new_key.offset = key.offset + destoff - off

will produce such an extent for the dest file:

	[ino, BTRFS_EXTENT_DATA_KEY, -10]

, which is obviously wrong.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
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