To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: axboe@kernel.dk, hch@infradead.org, martin.petersen@oracle.com,
        linux-api@vger.kernel.org, linux-kernel@vger.kernel.org,
        shane.seymour@hpe.com, bfields@fieldses.org,
        linux-fsdevel@vger.kernel.org, jlayton@poochiereds.net
Subject: Re: [PATCH v5 2/2] block: create ioctl to discard-or-zeroout a range of blocks
From: "Martin K. Petersen" <martin.petersen@oracle.com>
Organization: Oracle Corporation
References: <20151208062104.21427.91134.stgit@birch.djwong.org>
	<20151208062111.21427.30921.stgit@birch.djwong.org>
Date: Thu, 10 Dec 2015 12:38:18 -0500
In-Reply-To: <20151208062111.21427.30921.stgit@birch.djwong.org> (Darrick
	J. Wong's message of "Mon, 07 Dec 2015 22:21:11 -0800")
Message-ID: <yq1y4d22ohh.fsf@sermon.lab.mkp.net>
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>>>>> "Darrick" == Darrick J Wong <darrick.wong@oracle.com> writes:

Darrick> Create a new ioctl to expose the block layer's newfound ability
Darrick> to issue either a zeroing discard, a WRITE SAME with a zero
Darrick> page, or a regular write with the zero page.  This BLKZEROOUT2
Darrick> ioctl takes {start, length, flags} as parameters.  So far, the
Darrick> only flag available is to enable the zeroing discard part --
Darrick> without it, the call invokes the old BLKZEROOUT behavior.
Darrick> start and length have the same meaning as in BLKZEROOUT.

Darrick> This new ioctl also invalidates the page cache correctly on
Darrick> account of the previous patch in the series.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering
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