Re: What does scsi_level mean?

["jidong xiao" <jidong.xiao@xxxxxxxxx>]

Any one can kindly explain this?

Thanks
Jason Xiao

On 7/21/07, jidong xiao <jidong.xiao@xxxxxxxxx> wrote:
> I noticed that there is a char scsi_level in the struct scsi_device,
> what does scsi_level mean?
>
> struct scsi_device {
> ...
>        char scsi_level;
> ...
> }
>
> Is it SCSI revision?
> If the answer is true, then I am quite curious, from the code I have
> read, SCSI_2 is something special, see following function:
> picked up from drivers/scsi/scsi_sysfs.c:
> int scsi_sysfs_target_initialize(struct scsi_device *sdev){
>                /*
>                 * If there wasn't another lun already configured at
>                 * this target, then default this device to SCSI_2
>                 * until we know better
>                 */
>                sdev->scsi_level = SCSI_2;
> }
>
> Why SCSI_2 could be the default value, why not SCSI_1, why not SCSI_3,
> and etc.Seems SCSI_2 is distinguished from other levels,any reason for
> this?
>
> Thanks
> Jason Xiao
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