linux-kernel - Re: [PATCH 0/9] target: Add support for COMPARE_AND

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Message-ID: <20130820212912.GA9483@lst.de>
Date:	Tue, 20 Aug 2013 23:29:12 +0200
From:	Christoph Hellwig <hch@....de>
To:	"Nicholas A. Bellinger" <nab@...erainc.com>
Cc:	target-devel <target-devel@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	Martin Petersen <martin.petersen@...cle.com>,
	Chris Mason <chris.mason@...ionio.com>,
	James Bottomley <JBottomley@...allels.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: Re: [PATCH 0/9] target: Add support for COMPARE_AND_WRITE (VAAI)
	emulation

On Tue, Aug 20, 2013 at 08:07:51PM +0000, Nicholas A. Bellinger wrote:
> 
> It's also currently lacking the necessary sychronization between I/O
> submission of COMPARE_AND_WRITE verify instance and write instance
> user data, which is still being worked on in order to avoid additional
> overhead in the main I/O fast path.

I don't think merging such a non-conforming implementation makes any sense.

Also for a complex command like this with all it's race potential I would
really like to see some test cases to go along with it.

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