Path: csiph.com!goblin1!goblin.stu.neva.ru!takemy.news.telefonica.de!storethat.news.telefonica.de!telefonica.de!news.panservice.it!bofh.it!news.nic.it!robomod From: "Martin K. Petersen" Newsgroups: linux.kernel Subject: Re: [PATCH v5 2/2] block: create ioctl to discard-or-zeroout a range of blocks Date: Thu, 10 Dec 2015 18:40:04 +0100 Message-ID: References: X-Original-To: "Darrick J. Wong" Organization: Oracle Corporation User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Source-IP: userv0022.oracle.com [156.151.31.74] Sender: robomod@news.nic.it List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Approved: robomod@news.nic.it Lines: 22 X-Original-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 X-Original-Date: Thu, 10 Dec 2015 12:38:18 -0500 X-Original-Message-ID: X-Original-References: <20151208062104.21427.91134.stgit@birch.djwong.org> <20151208062111.21427.30921.stgit@birch.djwong.org> X-Original-Sender: linux-kernel-owner@vger.kernel.org Xref: csiph.com linux.kernel:1288736 >>>>> "Darrick" == Darrick J Wong 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 K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/