commit 47059d930f0e002ff851beea87d738146804726d
author Wang Shilong <wangsl.fnst@cn.fujitsu.com> Thu Jul 03 18:22:07 2014 +0800
committer Chris Mason <clm@fb.com> Wed Sep 17 13:37:26 2014 -0700
tree 5f32e2b5a7630cfd53c24fa9cad873c86368cff8
parent 48fcc3ff7dce0138c053833adf81670494f177f3

Btrfs: make defragment work with nodatacow option

Btrfs defragment will utilize COW feature, which means this
did not work for nodatacow option, this problem was detected
by xfstests generic/018 with nodatacow mount option.

Fix this problem by forcing cow for a extent with state
@EXTETN_DEFRAG setting.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>