[PATCH] scsi_debug version 1.61

[PATCH] scsi_debug version 1.61

[Douglas Gilbert]

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I have reworked the scsi_debug driver mainly to add
kernel timers to simulate delayed responses. This is
more realistic that returning immediately and allows
commands to become queued. The length of the delay is
controlled by a new boot line/module option: "scsi_debug_delay".

Other changes:
  - support REPORT LUNS
  - support more MODE SENSE pages
  - [following Doug Ledford's suggestion] do autsense
    (i.e. set Scsi_Cmnd::sense_buffer array appropriately
     when a status of CHECK CONDITION is set)
  - minor driverfs support
  - start adding error injection logic, see
    "scsi_debug_every_nth"

At the moment the only driverfs support is creating the
directory: /driverfs/bus/scsi/drivers/scsi_debug
Patrick Mochel sent a patch to lkml that would have allowed
driver parameters to be placed in that directory. That patch
didn't make it into lk 2.5.26 .

I'm interested in "clean" ways to inject errors. This would
allow, for example, people to observe (and fix) what happens
when QUEUE_FULL is returned for the first queued command.

The attachment is a patch against lk 2.5.26 . The full driver
and some documentation can be found at 
http://www.torque.net/sg/sdebug.html

I hope to backport this version to lk 2.4 (where it will become
scsi_debug version 0.61) shortly.

Doug Gilbert

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Re: [PATCH] scsi_debug version 1.61

[Douglas Gilbert]

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There have been some fixes to this driver and a crude
INQUIRY evpd page 0x83 has been added. A new diff
against lk 2.5.26 is attached.
There are tarballs on http://www.torque.net/sg/sdebug.html
for lk 2.5.26 and the lk 2.4 series (scsi_debug 
version 0.61).

Doug Gilbert


Douglas Gilbert wrote:
> 
> I have reworked the scsi_debug driver mainly to add
> kernel timers to simulate delayed responses. This is
> more realistic that returning immediately and allows
> commands to become queued. The length of the delay is
> controlled by a new boot line/module option: "scsi_debug_delay".
> 
> Other changes:
>   - support REPORT LUNS
>   - support more MODE SENSE pages
>   - [following Doug Ledford's suggestion] do autsense
>     (i.e. set Scsi_Cmnd::sense_buffer array appropriately
>      when a status of CHECK CONDITION is set)
>   - minor driverfs support
>   - start adding error injection logic, see
>     "scsi_debug_every_nth"
> 
> At the moment the only driverfs support is creating the
> directory: /driverfs/bus/scsi/drivers/scsi_debug
> Patrick Mochel sent a patch to lkml that would have allowed
> driver parameters to be placed in that directory. That patch
> didn't make it into lk 2.5.26 .
> 
> I'm interested in "clean" ways to inject errors. This would
> allow, for example, people to observe (and fix) what happens
> when QUEUE_FULL is returned for the first queued command.
> 
> The attachment is a patch against lk 2.5.26 . The full driver
> and some documentation can be found at
> http://www.torque.net/sg/sdebug.html
> 
> I hope to backport this version to lk 2.4 (where it will become
> scsi_debug version 0.61) shortly.

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