Date: Mon, 29 Jan 2001 15:15:57 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Peter Wemm <peter@netplex.com.au> Cc: Brian Somers <brian@Awfulhak.org>, freebsd-arch@FreeBSD.ORG Subject: Re: Cloned open support Message-ID: <21316.980777757@critter> In-Reply-To: Your message of "Mon, 29 Jan 2001 06:02:10 PST." <200101291402.f0TE2A451479@mobile.wemm.org>
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In message <200101291402.f0TE2A451479@mobile.wemm.org>, Peter Wemm writes: >Brian Somers wrote: >> Hi, >> >> I'm considering having a crack at adding support for cloned opens. >> Before I start, I guess I've got two questions: >> >> 1. Is anybody else doing this. >> >> 2. Given that I'll need to change the d_open prototype (and >> thus cdevsw), I'm going to affect every device driver in the >> tree - although only changing the first arg to a (dev_t) >> pointer, making things pretty easy to change and not too >> unexpected for anyone that's written sysv drivers. > >Not necessary. dev_t *is* a pointer. Add a flag to the device flags to >indicate that it allows clone opens, and maybe teach specfs a little about >it (ie: that the unit will be reassigned on a clone open) and you're done. But but but... we already *have* cloning Peter. It doesn't need a dedicated minordevice and it works for everything but vinum(4), and that is not because it cannot do what vinum(4) needs, but because vinum(4) needs somebody to do it. -- 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. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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