From nobody Mon Feb 9 01:18:07 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1518541846437201.4976174130186; Tue, 13 Feb 2018 09:10:46 -0800 (PST) Received: from localhost ([::1]:55527 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ele6P-000714-IX for importer@patchew.org; Tue, 13 Feb 2018 12:10:45 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51959) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ele1Z-0002l5-HI for qemu-devel@nongnu.org; Tue, 13 Feb 2018 12:05:48 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ele1X-0005Aw-T9 for qemu-devel@nongnu.org; Tue, 13 Feb 2018 12:05:45 -0500 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:37804 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ele1T-00057V-N5; Tue, 13 Feb 2018 12:05:39 -0500 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 53A44402291E; Tue, 13 Feb 2018 17:05:39 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-117-94.ams2.redhat.com [10.36.117.94]) by smtp.corp.redhat.com (Postfix) with ESMTP id A3C5010073CD; Tue, 13 Feb 2018 17:05:38 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Date: Tue, 13 Feb 2018 18:04:37 +0100 Message-Id: <20180213170529.10858-4-kwolf@redhat.com> In-Reply-To: <20180213170529.10858-1-kwolf@redhat.com> References: <20180213170529.10858-1-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Tue, 13 Feb 2018 17:05:39 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Tue, 13 Feb 2018 17:05:39 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'kwolf@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PULL 03/55] 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: kwolf@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Fam Zheng Signed-off-by: Fam Zheng Reviewed-by: Stefan Hajnoczi Reviewed-by: Kashyap Chamarthy Signed-off-by: Kevin Wolf --- qemu-img.texi | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/qemu-img.texi b/qemu-img.texi index 60a0e080c6..8a26400adb 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -86,6 +86,14 @@ 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 rel= axed in a future release. =20 +@item --force-share (-U) +If specified, @code{qemu-img} will open the image in shared mode, allowing +other QEMU processes to open it in write mode. For example, this can be us= ed to +get the image information (with 'info' subcommand) when the image is used = by a +running guest. Note that this could produce inconsistent results because = of +concurrent metadata changes, etc. This option is only allowed when opening +images in read-only mode. + @item --backing-chain will enumerate information about backing files in a disk image chain. Refer below for further description. --=20 2.13.6