linux-kernel - Re: [RFC PATCH 0/5] scsi:scsi_debug:Add error injection for single lun

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Date:   Sun, 13 Nov 2022 16:48:35 -0500
From:   Douglas Gilbert <dgilbert@...erlog.com>
To:     Wenchao Hao <haowenchao@...wei.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/5] scsi:scsi_debug:Add error injection for single
 lun

On 2022-11-09 10:59, Wenchao Hao wrote:
> The original error injection mechanism was based on scsi_host which
> could not inject fault for a single SCSI device.
> 
> This patchset provides the ability to inject errors for a single
> SCSI device. Now we supports inject timeout errors, queuecommand
> errors, and hostbyte, driverbyte, statusbyte, and sense data for
> specific SCSI Command
> 
> The first patch add an sysfs interface to add and inquiry single
> device's error injection info; the second patch defined how to remove
> an injection which has been added. The following 3 patches use the
> injection info and generate the related error type.
> 
> Wenchao Hao (5):
>    scsi:scsi_debug: Add sysfs interface to manager single devices' error inject
>    scsi:scsi_debug: Add interface to remove injection which has been added
>    scsi:scsi_debug: make command timeout if timeout error is injected
>    scsi:scsi_debug: Return failed value for specific command's queuecommand
>    scsi:scsi_debug: fail specific scsi command with result and sense data
> 
>   drivers/scsi/scsi_debug.c | 295 ++++++++++++++++++++++++++++++++++++++
>   1 file changed, 295 insertions(+)

Hi,
This patchset seems to assume all scsi_debug devices will be disk (-like) SCSI
devices. That leaves out other device types: tapes, enclosures, WLUNs, etc.

Have you considered putting these device specific additions under:
    /sys/class/scsi_device/<hctl>/device/error_inject/
instead of
    /sys/block/sdb/device/error_inject/

?

Doug Gilbert