Re: FWD: [BK PATCH] SCSI host num allocation improvement

[Ben Collins <bcollins@debian.org>]

On Fri, Feb 27, 2004 at 08:56:22AM +0100, Arjan van de Ven wrote:
> On Fri, 2004-02-27 at 02:04, Ben Collins wrote:
> > On Thu, Feb 26, 2004 at 04:56:01PM -0800, Matthew Dharm wrote:
> > > My only concern with something like this is the userspace race problem.
> > > i.e the following sequence of events:
> > > 
> > > (1) User uses cdrecord -scanbus to locate their device (host:bus:dev:lun)
> > > (2) HBA is disconnected 
> > > (3) New HBA is added
> > > (4) User issues command to host:bus:dev:lun, and addresses the wrong device
> > > 
> > > While the current system doesn't prevent this, it makes it a much more
> > > difficult situation to happen.
> > 
> > Surely the user would have to have known that one device was
> > disconnected and another connected. Same thing could already be said for
> > the scsi device allocation (sda, sdb, and sg0, sg1, sg2, etc...).
> 
> surely everyone is using cdrecord -dev=/dev/scd5  by now and not the 
> host:bus:dev crap...

scsidev: '/dev/sg1'
devname: '/dev/sg1'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.


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