linux-kernel - Re: [PATCH v6 00/10] scsi:scsi_debug: Add error injection for single device

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Message-ID: <b1a236de-3ee5-b854-5e94-05bd09e00b9b@huawei.com>
Date:   Mon, 16 Oct 2023 10:09:43 +0800
From:   Wenchao Hao <haowenchao2@...wei.com>
To:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        Douglas Gilbert <dgilbert@...erlog.com>
CC:     "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <louhongxiang@...wei.com>
Subject: Re: [PATCH v6 00/10] scsi:scsi_debug: Add error injection for single
 device

On 2023/10/10 17:20, 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 support 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 a 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 two just
> add a new interface to make reset target failed and control
> scsi_device's allow_restart flag.
> 

Friendly ping...

> V6:
>    - Check return value of debugfs_create_xxx() and print error log
>      if debugfs_create_xxx() return error
>    - Fix typo in description of patch7 and patch8
>    - Update the description of patch10
> 
> V5:
>    - Using rcu list to sync between error inject add, remove and check
>    - Add module parameter "allow_restart" to control scsi_device's
>      allow_restart flag
> 
> 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 (10):
>    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
>    scsi: scsi_debug: Add param to control sdev's allow_restart
> 
>   drivers/scsi/scsi_debug.c | 575 +++++++++++++++++++++++++++++++++++++-
>   1 file changed, 570 insertions(+), 5 deletions(-)
>