Calling other drivers

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I need to write a driver that satisfies its reads and writes by calling
other block drivers.  What is the proper way to do this?  Should I use
generic_file_read or do_generic_file_read?  Should I make a request
directly to the device using the blk_dev[] array?  If so, how do I do
that?

If I should use generic_file_read, is do_generic_file_read an asynchronous
version and is the "actor" function passed to it a call-back?

Thanks,

Jonathan


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