From owner-freebsd-fs  Sat Jan 22 23:53:19 2000
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To: Greg Lehey <grog@lemis.com>
Cc: Robert Watson <robert+freebsd@cyrus.watson.org>,
	Brian Beattie <beattie@aracnet.com>, fs@FreeBSD.ORG
Subject: Re: UDF, userfs
References: <Pine.LNX.4.10.10001211012020.28236-100000@shell1.aracnet.com> <Pine.BSF.3.96.1000121184917.66083B-100000@fledge.watson.org> <20000122131656.C391@mojave.worldwide.lemis.com>
From: Assar Westerlund <assar@sics.se>
Date: 23 Jan 2000 08:52:52 +0100
In-Reply-To: Greg Lehey's message of "Sat, 22 Jan 2000 13:16:57 +0800"
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Greg Lehey <grog@lemis.com> writes:
> Hmm.  A kld runs in kernel context, not user context.  Sure, it's
> easier to load than rebuilding a kernel, and I believe klds are the
> correct approach to added kernel functionality, but it doesn't offer
> one of the prime advantages of userland development: if your program
> crashes, your program crashes, not the system.  If you're developing a
> kld, a bug can crash the system.

Yes, but both the Coda and the Arla kld are very simple and all the
real work (and thus, the devlopment) takes part in the user space
daemon.  The kld is mostly there as a way of communicating with the
kernel.

/assar


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