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

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Date:   Mon, 14 Nov 2022 09:30:58 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     dgilbert@...erlog.com, 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 11/14/22 06:48, Douglas Gilbert wrote:
> 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/

But these are the same, no ?
At least on my Fedora box, I see:

/sys/block/sdp/device/ being
/sys/devices/pseudo_0/adapter0/host19/target19:0:0/19:0:0:0

and /sys/class/scsi_device/19:0:0:0/device being
/sys/devices/pseudo_0/adapter0/host19/target19:0:0/19:0:0:0

> 
> ?
> 
> Doug Gilbert
> 
> 
> 

-- 
Damien Le Moal
Western Digital Research