Re: How can I create or read/write a file in linux device driver?

[Jan Engelhardt]

On Jan 12 2007 09:27, linux-os (Dick Johnson) wrote:
>
>First, since file-operations require process context, and the kernel
>is not a process, you need to create a kernel thread to handle your file
>I/O.

Not always. If you do file I/O as part of a device driver, you are fine.
quad_dsp is such an example, where writing to /dev/Qdsp_* will trigger writes
to /dev/dsp and /dev/adsp.

>Once you set up this "internal environment," you use the appropriate
>kernel function(s) such as sys_open()

What against filp_open? That avoids the unnecessary getname() stuff in most
syscalls.


	-`J'
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