linux-kernel - Re: [PATCH v5 10/10] scsi: scsi_debug: Add param to control sdev's allow

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Message-ID: <d61e88d3-e1b7-44e0-ba9b-f633be0b5b30@interlog.com>
Date:   Sun, 8 Oct 2023 19:17:08 -0400
From:   Douglas Gilbert <dgilbert@...erlog.com>
To:     Wenchao Hao <haowenchao2@...wei.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        open-iscsi@...glegroups.com, linux-scsi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, louhongxiang@...wei.com
Subject: Re: [PATCH v5 10/10] scsi: scsi_debug: Add param to control sdev's
 allow_restart

On 2023-09-22 05:29, Wenchao Hao wrote:
> Add new module param "allow_restart" to control if setup
> scsi_device's allow_restart flag. This is used to test scsi
> command finished with sense_key 0x6, asc 0x4 and ascq 0x2
> 
> Signed-off-by: Wenchao Hao <haowenchao2@...wei.com>

Hi,
Looked at this and verified that the allow_restart flag of scsi_debug
devices (disks ?) is usually 0 and when the scsi_debug module is
started with allow_restart=1 then the allow_restart flag does indeed
change to 1. For example:
    # cat /sys/class/scsi_disk/1\:0\:0\:0/allow_restart
    1

That ASC/ASCQ code means: "Logical unit not ready, initializing command
required" according to my library. Played around with sg_start but didn't
see any change in how it reacts. According to scsi_device.h that flag's
description is: "issue START_UNIT in error handler" which implies it
changes how the EH handler reacts.

Perhaps the 3 line patch description could say a little more about how
to use this new parameter...

Tested-by: Douglas Gilbert <dgilbert@...erlog.com>

<snip>