linux-kernel - Re: [PATCH v5] scsi: support packing multi-segment in UNMAP command

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Date:   Fri, 10 Mar 2023 06:02:47 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Chao Yu <chao@...nel.org>
Cc:     martin.petersen@...cle.com, jejb@...ux.ibm.com, bvanassche@....org,
        hch@...radead.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] scsi: support packing multi-segment in UNMAP command

> -	/* If command type is WRITE or DISCARD, set bitmap as dirty */
> -	if (ufshpb_is_write_or_discard(cmd)) {
> +	/* If command type is WRITE, set bitmap as dirty */
> +	if (op_is_write(req_op(scsi_cmd_to_rq(cmd)))) {

Umm, a driver has absolutely no business poking into the UNMAP
payload.   Someone needs to fix the UFS driver first to not do this.