file I/O in kernel module

From: Joohyun Cha (zoo11@hst.co.kr)
Date: Tue Oct 22 2002 - 20:09:25 EDT

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Hi Gurus.

I'm trying to write a some tiny kernel module which fake a hostid.
I want module to read a hostid from file called /etc/hostid. so I
wrote a code that use a normal system call (ie. open(), read() etc.)
in a my kernel module. and when I tested it I found that it doesn't
work proper way that I thought. Maybe I should not use a normal
system call in a kernel module to handle file I/Os.
How can I do to handle a file (read from regular file) in a loadable
kernel module? Please give me some advise or reference.

Thanks in advance. I'll sum.
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