Btrfs: pass gfp_t to __add_prelim_ref() to avoid always using GFP_ATOMIC
Currently, only add_delayed_refs have to allocate with GFP_ATOMIC, So just pass arg 'gfp_t' to decide which allocation mode. Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Reviewed-by: Miao Xie <miaox@cn.fujitsu.com> Reviewed-by: Jan Schmidt <list.btrfs@jan-o-sch.net> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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