From patchwork Fri Dec 8 01:44:56 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fam Zheng X-Patchwork-Id: 845946 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3ytFYH04PKz9s7v for ; Fri, 8 Dec 2017 12:45:39 +1100 (AEDT) Received: from localhost ([::1]:35188 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eN7jN-0005ZR-60 for incoming@patchwork.ozlabs.org; Thu, 07 Dec 2017 20:45:37 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57622) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eN7is-0005Xv-5t for qemu-devel@nongnu.org; Thu, 07 Dec 2017 20:45:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eN7ir-0007eb-Dd for qemu-devel@nongnu.org; Thu, 07 Dec 2017 20:45:06 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45060) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eN7in-0007bI-43; Thu, 07 Dec 2017 20:45:01 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3C96821BA1; Fri, 8 Dec 2017 01:45:00 +0000 (UTC) Received: from lemon.redhat.com (ovpn-12-123.pek2.redhat.com [10.72.12.123]) by smtp.corp.redhat.com (Postfix) with ESMTP id 00609183C6; Fri, 8 Dec 2017 01:44:57 +0000 (UTC) From: Fam Zheng To: qemu-devel@nongnu.org Date: Fri, 8 Dec 2017 09:44:56 +0800 Message-Id: <20171208014456.16635-1-famz@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Fri, 08 Dec 2017 01:45:00 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2] qemu-img: Document --force-share / -U X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , kchamart@redhat.com, qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Fam Zheng Reviewed-by: Kashyap Chamarthy --- v2: - "code{qemu-img}". [Kashyap, Eric] - "etc.." -> "etc.". --- qemu-img.texi | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/qemu-img.texi b/qemu-img.texi index fdcf120f36..6b9f9adfc8 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -57,6 +57,15 @@ exclusive with the @var{-O} parameters. It is currently required to also use the @var{-n} parameter to skip image creation. This restriction may be relaxed in a future release. +@item --force-share (-U) + +If specified, @code{qemu-img} will open the image with shared permissions, +which makes it less likely to conflict with a running guest's permissions due +to image locking. For example, this can be used to get the image information +(with 'info' subcommand) when the image is used by a running guest. Note that +this could produce inconsistent result because of concurrent metadata changes, +etc. + @item fmt is the disk image format. It is guessed automatically in most cases. See below for a description of the supported disk formats.