btrfs: fix wrong allocating flag when reading page
the space cache use extent_readpages() to read free space information, so we can not use GFP_KERNEL flag to allocate memory, or it may lead to deadlock. Signed-off-by: Itaru Kitayama <kitayama@cl.bb4u.ne.jp> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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