open, read and write a block device in kernel

[Teh Kok How <khteh_(_at_)_willowglen_(_dot_)_com_(_dot_)_my>]

Hi;
	I am writing a device driver that in the <foo>attach routine it should be 
able to open a binary file in a flash or a scsi disk based on its pathname 
and load it into the secondary PCI memory. Basically what I am trying to 
achieve is to read the binary file from a block device and load it into the 
DSP internal memory in a PMC. Since open, read and write are userland 
syscalls, I would like to know how I could achive the same thing in the 
kernel, particularly in the attach routine....
	Any suggestion and comment is appreciated.

Regards,
TEH