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    SubjectRe: [PATCH scsi-misc-2.6 08/13] scsi: move request preps in other places into prep_fn()
    > +/*
    > + * Macro to determine the size of SCSI command. This macro takes vendor
    > + * unique commands into account. SCSI commands in groups 6 and 7 are
    > + * vendor unique and we will depend upon the command length being
    > + * supplied correctly in cmd_len.
    > + */
    > +#define CDB_SIZE(cmd) (((((cmd)->cmnd[0] >> 5) & 7) < 6) ? \
    > + COMMAND_SIZE((cmd)->cmnd[0]) : (cmd)->cmd_len)

    should probably go to scsi.h as it's generally usefull.

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