[2158] in linux-scsi channel archive
Re: More than one SCSI controler & SCSI_IOCTL_GET_IDLUN
daemon@ATHENA.MIT.EDU (Eric Youngdale)
Sun Jul 13 22:37:36 1997
Date: Sun, 13 Jul 1997 22:41:45 -0400 (EDT)
From: Eric Youngdale <eric@andante.jic.com>
To: Joerg Schilling <schilling@fokus.gmd.de>
cc: linux-scsi@vger.rutgers.edu, tn@bv.rz.fh-muenchen.de
In-Reply-To: <199707121448.QAA14376@sherwood.fokus.gmd.de>
On Sat, 12 Jul 1997, Joerg Schilling wrote:
> Hi,
>
> I want to enhance cdrecord to be able to deal with more than
> one SCSI controler.
>
> For that reason I need to know the SCSI Bus #, the Target ID and the LUN
> of each device. For this reason I found only one ioctl(2):
> SCSI_IOCTL_GET_IDLUN. It gives TargetID & LUN but unfortunately
> there is no Bus #.
>
> Instead there is totally rubbish information low_ino & 0xff
>
> I will for that reason give the advice for all cdrecord users
> to change /usr/src/linux/drivers/scsi/scsi_ioctl.c line 338
>
> from:
>
> + ((dev->host->hostt->proc_dir->low_ino & 0xff) << 24),
>
> to:
> + (dev->host->host_no << 24),
>
>
> As the file scsi_ioctl.c seemes not to be maintained, I ask you
> to modify this on the next Linux release too.
Actually there is a reason why things are the way they are.
With the current code, this is the only way to determine exactly what
type of host a given device corresponds to. The host_no is not a terribly
meaningful parameter and is mainly used for display purposes. Returning
this to the user could be useful just for informational purposes, but at
the moment I don't see a reason why the host_no *must* be determined.
-Eric
