Re: devd limitations / automounting removable storage

From: Jeff Roberson (jroberson_at_chesapeake.net)
Date: 09/18/03

  • Next message: Bruce M Simpson: "Re: devd limitations / automounting removable storage" 
    Date: Wed, 17 Sep 2003 20:18:49 -0400 (EDT)
To: John-Mark Gurney <gurney_j@efn.org>

    On Wed, 17 Sep 2003, John-Mark Gurney wrote:

    > Robert Watson wrote this message on Wed, Sep 17, 2003 at 16:19 -0400:
    > > > Apart from that, it's just a matter of telling me how to send the
    > > > event...
    > >
    > > This is a very similar concern to the question I raised at BSDCon about
    > > distinguishing network interfaces at the newbus and network service
    > > levels. My temptation would be to assign a "layer" as well as a device
    > > name to devices when they are announced. I.e.,
    > >
    > > Layer Device Meaning
    > > newbus xl0 A device named xl0 is now available
    > > devfs net/xl0 A device node named net/xl0 is now available
    > > ifnet xl0 A network interface named xl0 is now available
    > > newbus ad0 A device named ad0 is now available
    > > devfs ad0 A device node named ad0 is now available
    > > geom ad0 A storage device named ad0 is now available
    > >
    > > We might skip the devfs layer since it's probably implicit in the
    > > completion of ifnet_attach() and disk_create(), but it's worth thinking
    > > about. This would allow ifconfig commands to be issued once the network
    > > device is available, rather than once newbus has attached an xl0. Or for
    > > geom to announce ad0s1e even though newbus doesn't know about it. Or for
    > > devd to handle the introduction of synthetic interfaces such as vlan, tun,
    > > etc, which aren't visible to newbus. Or for the device driver names and
    > > interface names to differ (or for a non-one-one mapping, interface
    > > renames, etc).
    >
    > I was thinking about a more generic event posting mechanism, where
    > modules can register to receive notifications when events came in.
    >

    Please use kqueue. We should have 1 eventing mechanism in the kernel.

    > We should have each event contain:
    > system (enum/int)
    > subsystem? (enum/int)
    > event (enum/int)
    > device (char[64?])
    > additionaldata (void *, size_t combo)
    >
    > This means we can make it more extensible, and have a set of well
    > defined system/subsystem/event triplets, while at the same time, letting
    > future interfaces expand.
    >
    > The subsystem would be used for something like the network stack, which
    > has multiple subsystems, like interface, routing, connections.
    >
    > The advantage is then we can reduce the number of /dev entries that
    > convey the same information, but have different calling conventions.
    >
    > --
    > John-Mark Gurney Voice: +1 415 225 5579
    >
    > "All that I will do, has been done, All that I have, has not."
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  • Next message: Bruce M Simpson: "Re: devd limitations / automounting removable storage"

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