ext4: start to support iopoll method
Since commit "b1b4705d54ab ext4: introduce direct I/O read using iomap infrastructure", we can easily make ext4 support iopoll method, just use iomap_dio_iopoll(). Reviewed-by: NJan Kara <jack@suse.cz> Signed-off-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com> Acked-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
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