From: "D. Hazelton" <dhazelton@enter.net>
To: Joerg Schilling <schilling@fokus.fraunhofer.de>
Subject: Re: CD writing in future Linux (stirring up a hornets' nest)
Date: Tue, 14 Feb 2006 17:32:12 -0500
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       davidsen@tmr.com, axboe@suse.de
References: <Pine.LNX.4.61.0601251606530.14438@yvahk01.tjqt.qr> <20060213154921.GA22597@kroah.com> <43F22887.nailCA4XYHC4@burner>
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On Tuesday 14 February 2006 13:59, Joerg Schilling wrote:
> Greg KH <greg@kroah.com> wrote:
> > On Mon, Feb 13, 2006 at 02:26:54PM +0100, Joerg Schilling wrote:
> > > Greg KH <greg@kroah.com> wrote:
> > > > On Fri, Feb 10, 2006 at 04:06:39PM -0500, Bill Davidsen wrote:
> > > > > The kernel could provide a list of devices by category. It doesn't
> > > > > have to name them, run scripts, give descriptions, or paint them
> > > > > blue. Just a list of all block devices, tapes, by major/minor and
> > > > > category (ie. block, optical, floppy) would give the application
> > > > > layer a chance to do it's own interpretation.
> > > >
> > > > It does so today in sysfs, that is what it is there for.
> > >
> > > Do you really whant libscg to open _every_ non-directory file under
> > > /sys?
> >
> > Of course not.  Here's one line of bash that gets you the major:minor
> > file of every block device in the system:
> > 	block_devices="$(echo /sys/block/*/dev /sys/block/*/*/dev)"
> >
> > The block devices are all in a specific location.
>
> Are you sure you understand the problem?
>
> It isd most unlikely that all SCSI devices are there.
>
> J?rg

Which is why there is also /sys/class/scsi_host and /sys/class/scsi_device
those two, together with the block device data available via /sys/block should 
be enough to enumerate every ATAPI and SCSI device on the system.

DRH
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