linux-kernel - Re: [RESEND PATCH v3] scsi: Bypass certain SCSI commands on disks with "use_192_bytes_for

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Message-ID: <3b6cca0d-7aa5-43b6-8f4a-429f17558121@acm.org>
Date: Tue, 25 Feb 2025 12:54:01 -0800
From: Bart Van Assche <bvanassche@....org>
To: WangYuli <wangyuli@...ontech.com>, James.Bottomley@...senPartnership.com,
 martin.petersen@...cle.com
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
 stern@...land.harvard.edu, zhanjun@...ontech.com, niecheng1@...ontech.com,
 guanwentao@...ontech.com, chenlinxuan@...ontech.com,
 Xinwei Zhou <zhouxinwei@...ontech.com>, Xu Rao <raoxu@...ontech.com>,
 Yujing Ming <mingyujing@...ontech.com>
Subject: Re: [RESEND PATCH v3] scsi: Bypass certain SCSI commands on disks
 with "use_192_bytes_for_3f" attribute


On 2/25/25 5:11 AM, WangYuli wrote:
> Disks have the attribute use_192_bytes_for_3f, which means that disks
 > only accept MODE SENSE transfer lengths of 192 bytes>
> However, when lshw sends MODE SENSE command to disks,
> use_192_bytes_for_3f will not be considered, which will cause some
> disks with use_192_bytes_for_3f to be unusable
> 
> To solve this problem, it is necessary to determine whether the
> device has the use_192_bytes_for_3f attribute at the scsi level. If
> the device has use_192_bytes_for_3f, when lshw or other applications
 > send MODE SENSE command through ioctl, the command with the data
 > length field of 0xff needs to be filtered out to avoid device
 > abnormality.
Has it been considered to truncate the MODE SENSE buffer to 192 bytes
instead of rejecting the MODE SENSE command?

Thanks,

Bart.