The message format of Fig. 3-17 is used for sending request messages to drivers for block devices. Could any fields be omitted for character devices? Which ones?

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Field Type m.m_type int m.DEVICE int m.PROC NR int m.COUNT int m.POSITION long m.ADDRESS char* Requests Meaning Operation requested Minor device to use Process requesting the I/O Byte count or ioctl code Position on device Address within requesting process