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    SubjectRe: CD writing in future Linux (stirring up a hornets' nest)
    Matthias Andree <matthias.andree@gmx.de> wrote:

    > Joerg Schilling wrote:
    >
    > >> So I'll repeat my question: is there anything that SG_IO to /dev/hd* (via
    > >> ide-cd) cannot do that it can do via /dev/sg*? Device enumeration doesn't count.
    > >
    > > But device enumeration is the central point when implementing -scanbus.
    >
    > Again: Is there anything *besides* (<German>: außer) device enumeration that
    > does not work with the current /dev/hd* SG_IO interface?

    This is the main point.

    People like to run cdrecord -scanbus in order to find a list of usable devices.
    People like to see all SCSI devices in a single name space as they are all
    using the same protocol for communication.

    A sane way to send SCSI commands to _any_ type of devices would be to have a
    SCSI generic transport layer that is independent from the high-level features
    of the OS and that is independent from whether there is a high-level driver for
    this device at all.

    This is what I designed the scg driver interface for in 1986 and this is what
    Adaptec did in 1988 with ASPI. This is of course also why the SCSI standard
    commitee made a proposal for the CAM SCSI interface.

    http://www.t10.org/ftp/t10/drafts/cam/cam-r12b.pdf
    http://www.t10.org/ftp/t10/drafts/cam3/cam3r03.pdf

    Jörg

    --
    EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
    js@cs.tu-berlin.de (uni)
    schilling@fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
    URL: http://cdrecord.berlios.de/old/private/ ftp://ftp.berlios.de/pub/schily
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