ext4: split ext4_file_write into buffered IO and direct IO
ext4_file_dio_write is defined in order to split buffered IO and direct IO in ext4. This patch just refactor some stuff in write path. CC: Tao Ma <tm@tao.ma> CC: Eric Sandeen <sandeen@redhat.com> CC: Robin Dong <hao.bigrat@gmail.com> Signed-off-by: NZheng Liu <wenqing.lz@taobao.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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