Date: Sat, 09 Nov 2002 22:37:13 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Takanori Watanabe <takawata@axe-inc.co.jp> Cc: current@freebsd.org Subject: Re: getting rid of devfs... Message-ID: <96040.1036877833@critter.freebsd.dk> In-Reply-To: Your message of "Sun, 10 Nov 2002 06:26:40 %2B0900." <200211092126.GAA10577@axe-inc.co.jp>
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In message <200211092126.GAA10577@axe-inc.co.jp>, Takanori Watanabe writes:
>In message <64608.1036834305@critter.freebsd.dk>, Poul-Henning Kamp wrote:
>
>>DEVFS:
>
>> 3. major/minors will be dynamically assigned.
>
>So we will need file to list node id list in printf(9) format,
>instead of /sys/conf/majors.
I am not sure about this... [1]
>And more better if we generate device name #define or array of
>string from the file. This will help us implementing loading
>module when an user process attempt to open some nodes that
>owned by unloaded modules.
and even less about this... [2]
That said, just because I don't like it doesn't mean that people
should try to prototype it and see if I'm wrong...
Poul-Henning
[1] A major part of the drive behind DEVFS is to avoiding the need
to register device drivers in a magic, global file. I will agree
that it is an predictable outcome that one day two drivers will
both try to be /dev/foo but he, they get to haggle that one out for
themselves.
[2] I simply cannot see us kldload'ing stuff in response to
ls -l /dev/watchthis
(This is a trick answer: The point is that at VOP_LOOKUP time
where the device cloning runs, you don't know for what operation
the VOP_LOOKUP is called: stat, open, remove, rename... (Well,
some of them you do, but not the interesting ones).
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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