Re: On demand modules loading with {tmp,ram}fs and udev

[Greg KH <greg@kroah.com>]

On Sat, Oct 25, 2003 at 03:09:32AM +0200, Tomasz Torcz wrote:
> On Fri, Oct 24, 2003 at 05:42:34PM -0700, Greg KH wrote:
> > On Sat, Oct 25, 2003 at 02:00:18AM +0200, Tomasz Torcz wrote:
> > > Hi,
> > > 
> > > I was thinking about small addition to tmpfs. When mounted with 'dev'
> > > option, any lookup of non existing file should result in calling
> > > modprobe with filename as argument.
> > > When coupled with mount tmpfs over /dev (or /udev) this functionality
> > > would allow on-demand module loading (as with devfs and plain old 
> > > device nodes).
> > 
> > How will you do the mapping of /dev names to modules in kernel space?
> > How are you going to know which of the 50 or so sound drivers to load
> > when opening /dev/dsp?
> 
> Just call modprobe. Modprobe will check /etc/modprobe.conf for dsp
> aliases and load module. Then udev will make devnode.

Ok, that sounds reasonable.  Looking forward to your ramfs
implementation that does this :)

> I'm also surprised that"load the driver when we open the /dev node" 
> is a hack. I get used to this standard Linux functionality as
> something obvious. Other OSed (*BSD, Solaris etc.) don't work like
> that?

I do not know what other oses do in this regard, sorry.

greg k-h


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