linux-kernel - Re: [PATCH 1/3] target/sbc: Make WRITE_SAME check differentiate between UNMAP=[1,0]

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Date:	Thu, 15 Nov 2012 05:52:20 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH 1/3] target/sbc: Make WRITE_SAME check differentiate
 between UNMAP=[1,0]

> +	if (flags[0] & 0x08)
> +		cmd->se_cmd_flags |= SCF_WRITE_SAME_DISCARD;

I don't like this flag at all.  We can still simply check the CDB
during ->execute_cmd and avoid this redundant flag.

Except for that bit the changes look fine, but should not be a patch
on their own.  Without an actual implementation this relaxation is
actively harmful.
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