linux-kernel - Re: [PATCH v4 0/9] scsi:scsi_debug: Add error injection for single device

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Message-ID: <b03162f7-7bdf-1e52-a7ba-718389fbeafc@huawei.com>
Date:   Thu, 31 Aug 2023 10:11:40 +0800
From:   "haowenchao (C)" <haowenchao2@...wei.com>
To:     "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Douglas Gilbert <dgilbert@...erlog.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <louhongxiang@...wei.com>, <wubo40@...wei.com>
Subject: Re: [PATCH v4 0/9] scsi:scsi_debug: Add error injection for single
 device

On 2023/8/15 20:23, 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. Two new error injection is defined to make
> abort command or reset LUN failed.
> 
> Besides error injection for single device, this patchset add a
> new interface to make reset target failed for each scsi_target.
> 
> The first two patch add an debugfs interface to add and inquiry single
> device's error injection info; the third patch defined how to remove
> an injection which has been added. The following 5 patches use the
> injection info and generate the related error type. The last one just
> Add a new interface to make reset target failed.
> 

Ping...

> V4:
>    - Fix BUG_ON triggered by schedule in atomic context when rmmod scsi_debug
>      Closes: https://lore.kernel.org/oe-lkp/202308031027.5941ce5f-oliver.sang@intel.com
> 
> V3:
>    - Add two more error types to fail abort command and lun reset
>    - Fix memleak when rmmod scsi_debug without clearing errors injected
>    - Fix memkeak because did not implement release in sdebug_error_fops
>    - Fix possible NULL point access in scsi_debug_slave_destroy
>    - Move specific error type's description to each single patch which
>      implement this error type
>    - Add interface to make target reset fail
> 
> V2:
>    - Using debugfs rather than sysfs attribute interface to manage error
> 
> Wenchao Hao (9):
>    scsi:scsi_debug: create scsi_debug directory in the debugfs filesystem
>    scsi:scsi_debug: Add interface to manage single device's error inject
>    scsi:scsi_debug: Define grammar to remove added error injection
>    scsi:scsi_debug: timeout command if the error is injected
>    scsi:scsi_debug: Return failed value if the error is injected
>    scsi:scsi_debug: set command's result and sense data if the error is injected
>    scsi:scsi_debug: Add new error injection abort failed
>    scsi:scsi_debug: Add new error injection reset lun failed
>    scsi:scsi_debug: Add debugfs interface to fail target reset
> 
>   drivers/scsi/scsi_debug.c | 512 +++++++++++++++++++++++++++++++++++++-
>   1 file changed, 507 insertions(+), 5 deletions(-)
>