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[dm-devel] NetBSD libdevmapper port



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Hi,

*** Please keep me on CC when you replying from dm-devel list I'm not currently subscribed there. ***

My name is Adam Hamsik and this summer I'm working on GSOC project Write and improve LVM driver. As my task I have rewritten (We can't include GPL software into NetBSD kernel therefore I have rewritten it from scratch)dm like driver for NetBSD and ported libdevmapper + lvm2tools to NetBSD. There are some small differences between
Linux and NetBSD such as:

a) NetBSD doesn't use proc filesystem like linux does.

b) NetBSD has 2 types of devices(when we talk about disk devices) raw and block. raw device is char device which allow users directly from device(without buffer cache).

After the first implementation of dm-driver my mentor suggested to rewrite/clean dm-ioctl interface to be more NetBSD-like. I have implemented new interface based on proplib library [1] it is based on work
made by apple [2]. I have added 3 files to libdevmapper

include/netbsd/netbsd-dm.h -> file shared between kernel driver and libdevmapper. lib/ioctl/libdm_netbsd.c -> file with external functions for parsing native NetBSD proplist dictionaries to
			      libdevmapper dm_ioctl structure.

lib/ioctl/libdm-nbsd-iface.c -> this is copied/changed libdm-iface.c I found that number of NetBSD specific changes is bigger than I can easily #ifdef them, therefore I have added new
				NetBSD interface file.

I have created patch against latest release of libdevmapper, it would be great if we will be able to manage commiting of this patch to libdevmapper main repo. My patch is currently not ready to commit, it needs major cleanup, but I thought that it would be good to let dm developers know about my effort and show my work to them.

My patch is located here [3], I have uploaded patch against lvm2tools, too. But it is patch against 2.02.28. Because there were quite massive changes to lvm2tools in latest releases I will report lvm2tools again and
merge my changes with latest lvm release.

There is also my BSD licensed device-mapper driver which is located here [5].

Any suggestions, comments are welcome.


[1] http://netbsd.gw.com/cgi-bin/man-cgi/man?proplib+3+NetBSD-current
[2] http://developer.apple.com/documentation/Darwin/Reference/ManPages/man5/plist.5.html
[3] http://www.netbsd.org/~haad/libdevmapper_netbsd.diff
[4] http://www.netbsd.org/~haad/lvm2_netbsd.diff
[5] http://www.netbsd.org/~haad/dm20080610.tar.bz2

Regards

Adam.

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