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List:       freebsd-fs
Subject:    Writing a plain text file to disk from kernel space [FYI]
From:       Lawrence Stewart <lstewart () room52 ! net>
Date:       2007-06-26 3:02:46
Message-ID: 468081D6.6010603 () room52 ! net
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Hi all,

As part of a project I've been involved with, we've released some code 
and a report that might be of interest to people on this list. One of 
our problems was figuring out how to write to a file directly from 
kernel space (details archived here: 
http://lists.freebsd.org/pipermail/freebsd-hackers/2007-May/020544.html). 
It seems to be a problem a few people have come up against, but we 
didn't manage to find any obvious answers at the time.

We've made a prototype module (named filewriter) available that 
specifically demonstrates file writing from within the kernel. It should 
hopefully provide a useful reference implementation for anyone wanting 
to do this in the future.

We've also made a technical report available that documents what we 
learnt whilst transitioning from noob kernel hackers to guys that have a 
(partial) clue. The report is certainly a useful reference for us and 
people working at our research centre. We hope it will also be a useful 
reference for the community to point people at who are new to kernel 
hacking. The report's title is "An Introduction to FreeBSD 6 Kernel 
Hacking" and has been released as Centre for Advanced Internet 
Architectures Technical Report 070622A.

The code distributions and technical report can be grabbed from 
http://caia.swin.edu.au/urp/newtcp/ under the "Tools" and "Papers" 
sections respectively.

If you find a use for the code or any bugs in the code/documentation, 
we'd be very happy to hear from you.

Cheers,
Lawrence

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