How to use ioctl write data to ide device?

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Hi all:

   I have a ide device which need use special command to configure it.
I want to write a user space program to control it.

so I try to use ioctl send my command, but after I send IDE command
I must send 512byte to device.

does anyone know how to write data from user space?

and I have another question,
    what is "hwif->drives[0].unmask = 1;", how to use it correctly?

--
Richard Liu
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• Next message: Roy Sigurd Karlsbakk: "Separate 2.4 and 2.5 lkml?"
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