RE: read only scsi disk

Ming Zhang
2006-02-09T19:39:17Z

thx.

but if i am correct, cdrom is handled in sr while disk is handled in sd.
so they are independent issues. of course, might be same reason. :P

the key here is why sd.c need to judge write protect only for removable
disk. is there no case that a disk is read only but not removable? for
example, if later a secure disk has internal security protection and
after authentication, the allowed option is only to read? this can be
common for networked disks.

ming

On Thu, 2006-02-09 at 14:32 -0500, berthiaume_wayne@emc.com wrote:
> I seem to recall this behavior had something to do with the handling of
> CD/ROM disks at one time.
>
> Regards,
> Wayne.
>
> -----Original Message-----
> From: linux-scsi-owner@vger.kernel.org
> [mailto:linux-scsi-owner@vger.kernel.org] On Behalf Of Ming Zhang
> Sent: Thursday, February 09, 2006 2:19 PM
> To: Matthew Wilcox
> Cc: linux-scsi; Damian Pietras
> Subject: Re: read only scsi disk
>
> so fc disk is also removable, since anyone could unplug the fc cable at
> any time...
>
> so even parallel scsi disk, sata disk...
>
> i donot think this is a good reason. ;)
>
> ming
>
> On Thu, 2006-02-09 at 12:02 -0700, Matthew Wilcox wrote:
> > On Thu, Feb 09, 2006 at 12:04:07PM -0500, Ming Zhang wrote:
> > > We are adding the support for an OSS iscsi target to support export an
> > > iscsi disk as readonly. We set correct read only bit in sense dbd. But
> > > we found that only when we set the removable bit, the linux will
> > > actually check the ro bit. more detail information can be found from
> >
> > Surely all iSCSI discs are removable, since anyone could unplug the
> > network cable at any time ...
>
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