From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52618) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bnpnF-0006pQ-Vg for qemu-devel@nongnu.org; Sat, 24 Sep 2016 12:27:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bnpnE-0003Bn-2U for qemu-devel@nongnu.org; Sat, 24 Sep 2016 12:27:12 -0400 References: <57E5752C.3080407@virtuozzo.com> <20160923212126.vo3hvb4hxojjh7s4@grep.be> From: "Denis V. Lunev" Message-ID: Date: Sat, 24 Sep 2016 10:54:37 +0300 MIME-Version: 1.0 In-Reply-To: <20160923212126.vo3hvb4hxojjh7s4@grep.be> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] write_zeroes/trim on the whole disk List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Wouter Verhelst , Eric Blake Cc: Vladimir Sementsov-Ogievskiy , qemu-devel , qemu-block@nongnu.org, nbd-general@lists.sourceforge.net, kwolf@redhat.com, Paolo Bonzini , Stefan Hajnoczi On 09/24/2016 12:21 AM, Wouter Verhelst wrote: > On Fri, Sep 23, 2016 at 02:00:06PM -0500, Eric Blake wrote: >> My preference would be a new flag to the existing commands, with >> explicit documentation that 0 offset and 0 length must be used with that >> flag, when requesting a full-device wipe. > Alternatively, what about a flag that says "if you use this flag, the > size should be left-shifted by X bits before processing"? That allows > you to do TRIM or WRITE_ZEROES on much larger chunks, without being > limited to "whole disk" commands. We should probably make it an illegal > flag for any command that actually sends data over the wire, though. > interesting. Actually I like this ;)