From owner-freebsd-current  Tue Nov  3 08:56:04 1998
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To: Brian Feldman <green@zone.syracuse.net>
cc: John Hay <jhay@mikom.csir.co.za>, freebsd-current@FreeBSD.ORG
Subject: Re: Booting Elf Kernel : replying to myself 
In-reply-to: Your message of "Tue, 03 Nov 1998 09:40:40 EST."
             <Pine.BSF.4.05.9811030937540.27548-100000@zone.syracuse.net> 
Date: Wed, 04 Nov 1998 00:53:51 +0800
From: Peter Wemm <peter@netplex.com.au>
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Brian Feldman wrote:
> I am referring also that it would check to see if this file exists, and
> return a malloced answer, else return NULL. This way it would be asy to
> say something like
> char *name;
> if ((name = getkldbyname("mfs")) != NULL {
> 	kldload(name);
> 	free(name);
> } else {
> 	fprintf(stderr, "Could not load mfs.\n");
> 	exit(1);
> }

Well, it would have to parse the module path:
$ sysctl kern.module_path
kern.module_path: /;/boot/;/modules/

The kernel searches the path already, the best way to do the code above is:

if (kldload("mfs") == -1) {
	fprintf(stderr, "Could not load mfs.\n");
	exit(1);
}

.. but the kernel will already try this in mount(2) now.  I have already 
got one "What???" response about having just made mount do this, so I 
guess we'll have to wait and see if this is going to stay.

> Brian Feldman
> 
> On Tue, 3 Nov 1998, Brian Feldman wrote:
> 
> > So should we take the VFS loading out of libc and add it to mount? Or
> > should there be a wrapper function in libc, getkldbyname (char *name) and
> > return "/modules/name.ko"?
> > 
> > Brian Feldman
> > 
> > On Tue, 3 Nov 1998, Peter Wemm wrote:
> > 
> > > Brian Feldman wrote:
> > > > Ahhhh, that's where it is! I have no good idea on how to allow, with th
    is
> > > > code, lkm's and kld's to coexist.... so is it time to completely phase 
    out
> > > > lkm's yet?
> > > 
> > > I think the best way is to have mount(2) initiate a kldload if needed.  W
    e 
> > > will need this functionality sooner or later.  If mount(2) does it, we ca
    n 
> > > garbage collect unused, unmounted filesystems after a while and unload 
> > > them.
> > > 
> > > > Brian Feldman
> > > > 
> > > > On Mon, 2 Nov 1998, John Hay wrote:
> > > > 
> > > > > > Be sure to let me know when ELF kernels can autoload kld modules li
    ke the
> > > > > > current a.out kernel does with lkm's.
> > > > > 
> > > > > It's not the kernel that loads them. Go and look in lib/libc/gen/getv
    fsent.
> > >     c
> > > > > 
> > > > > John
> > > > > -- 
> > > > > John Hay -- John.Hay@mikom.csir.co.za

Cheers,
-Peter



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