Re: [Scst-devel] First version of the loopback driver attached

[Vladislav B. <vs...@vl...>]

Hi,

Richard Sharpe wrote:
> Hi,
> 
> Attached is the first version of the driver I mentioned a while ago. It 
> is a SCSI LLD that creates a SCSI target and then ferries all commands 
> to the SCST driver.
> 
> This works in that I can set up a vdisk and then copy from my real disk 
> to the vdisk and check the results. It is slow because of all the printks.
> 
> I started this in Santa Clara, worked on it in Bangalore and got it to 
> the stage of working here in Hyderabad. I will work on it some more to 
> clean it up and will probably do more work in Hong Kong airport on the 
> way home. This feels just like the good old days when I worked on 
> Ethereal in airport lounges.
> 
> The commands I used to test are:
> 
> modprobe scst
> modprobe scst_vdisk
> echo "open vm_disk /some/path/to/a/file" > /proc/scsi_tgt/vdisk/vdisk
> echo "add vm_disk 0" > /proc/scsi_tgt/groups/Default/devices
> 
> insmod scst_debug
> 
> then do some dd's etc.

It seems to me as a black magic. How can it submit requests to SCST core 
with:

static int scst_debug_queuecommand(struct scsi_cmnd *SCpnt,
                                    done_funct_t done)
{

         return SUCCESS;
}

? I guess you sent an older version?

Also, you can't remove other peoples copyrights from the scsi_debug 
code. They can be hurt by it.

> This should work for tape devices as well, since there is nothing disk 
> specific in my driver.
> 
> Any feedback appreciated.
> 
> Regards,
> Richard Sharpe, Wireshark, Samba ...
> 
> 
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