[dm-devel] Re: no INQUIRY from userspace please (was Re: [PATCH 7/9] scsi_dh: Add support for SDEV_PASSIVE)

[Luben Tuikov <ltuikov yahoo com>]

--- On Thu, 2/7/08, James Bottomley <James Bottomley HansenPartnership com> wrote:
> This is all a tradeoff.  If you want userspace *never* to
> issue raw SCSI
> commands like INQUIRY, we're going to have to provide
> the needed
> information from the kernel via sysfs ... including VPD
> strings.  This
> is something we've always shovelled off into userspace
> before.

What if a user-space application client _does_ send an INQUIRY to
a device anyway?

It would probably be better to preserve application client behaviour
and simulate/emulate n-th INQUIRY, after the 1st for such broken
device firmwares that break on any subsequent INQUIRY.  Possibly
in the LLDD or via blacklisting in the mid-layer.

   Luben