Re: [RESEND PATCH v3] scsi: Bypass certain SCSI commands on disks with "use_192_bytes_for_3f" attribute

[Bart Van Assche]

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.