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    SubjectRe: [PATCH 2.6.13 5/14] sas-class: sas_discover.c Discover process (end devices)
    On Wed, Sep 14, 2005 at 08:28:29AM -0400, Luben Tuikov wrote:
    > On 09/13/05 18:42, Patrick Mansfield wrote:

    > > What I mean is that the target has to intercept the command whether it is
    > > a REPORT LUN or for the well known (W_LUN).
    > >
    > > The target (firmware) code has to have code today like:
    > >
    > > if (cmd == REPORT_LUN) {
    > > do_report_lun();
    > > }
    > >
    > > For only W_LUN support, the code might be something like:
    > >
    > > if (lun == W_LUN) {
    > > if (cmd == REPORT_LUN) {
    > > do_report_lun();
    > > }
    > > }
    > >
    > > But the first case above already covers even the W_LUN case.
    >
    > _Except_, that what the firmware actually does is, it routes
    > the tasks by LUN first, _before_ looking up with what the command
    > is.* This is crucial.

    That is what the second code snippet above is meant to show.

    > > So adding a W_LUN at this point does not add any value ... maybe it looks
    > > nice in the spec and in someones firmware, but it does not add anything
    > > that I can see.
    >
    > I wonder if the maintainer of the SCSI Core would listen or ignore your
    > opinion here.

    > I wonder _who_ decides here where speculation ends and industry
    > opinion starts?

    I am talking about the scsi spec, not the code. IMO linux scsi code should
    support W_LUN and 64 bit LUN.

    -- Patrick Mansfield
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