Re: SCSI Patches - mostly on/off-line stuff

[David Brownell <david-b@pacbell.net>]

I see what you're thinking.  No, I mostly see these
distinctions as relating to code paths the kernel 
has to deal with; ideally, users don't see "pending".

We need that stuff to behave well (it took a while
for USB to do so, and the networking code is still
rolling in such changes) before we should expose it
to users.  IMO.


----- Original Message ----- 
From: Miles Lane <miles@megapathdsl.net>
To: David Brownell <david-b@pacbell.net>
Cc: <linux-scsi@vger.kernel.org>; <linux-hotplug-devel@lists.sourceforge.net>
Sent: Thursday, January 18, 2001 3:25 PM
Subject: Re: SCSI Patches - mostly on/off-line stuff


> David Brownell wrote:
> > 
> > Well, now that I think of it ... this may be a good way to capture
> > the two different kinds of "remove".  Think of "remove" as breaking
> > a binding between device and driver, and these scenarios:
> > 
> >     - One "remove" is done by removing the hardware.  That
> >       can't really be reversed ... gotta clean up any messy
> >       device and "higher level" state, errors all around.
> > 
> >     - Another is done by sysadmin request.  Hardware still
> >       there, driver still there ... but they're not bound.
> >       (Maybe it's install-new-driver time, say, or to make
> >       sure hardware removal won't cause trouble.)
> > 
> > In that latter case there's a lot of flexibility.  Why are you
> > thinking a "remove" might want to get undone?
> 
> Would you clarify how you envision a user working with a
> pending remove?  Is it an implementation where a long
> period of time might pass before the the device is actually
> removed?
> 
> Could something like this happen?
> 
> - I start compiling XFree86 on a removable device and tell
>   the system to unmount the media and remove the device
>   when the compile is complete, a "pending remove" is set.
> 
> - During the compile, I realize that I want to make some
>   additional source modifications, so I want to cancel the
>   device removal and continue accessing the device.
> 
> I may be misunderstanding the sequence of events and how 
> that might impact a user.
> 
> Miles


_______________________________________________
Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
http://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel