arcmsr: simplify ioctl data read/write
Signed-off-by:Ching Huang <ching <2048@areca.com.tw> Reviewed-by:
Tomas Henzl <thenzl@redhat.com> Signed-off-by:
Christoph Hellwig <hch@lst.de>
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Signed-off-by:Ching Huang <ching <2048@areca.com.tw> Reviewed-by:
Tomas Henzl <thenzl@redhat.com> Signed-off-by:
Christoph Hellwig <hch@lst.de>