From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57509) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ek1Fi-00050M-OL for qemu-devel@nongnu.org; Fri, 09 Feb 2018 00:29:39 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ek1Fh-0003xw-Qv for qemu-devel@nongnu.org; Fri, 09 Feb 2018 00:29:38 -0500 From: Fam Zheng Date: Fri, 9 Feb 2018 13:29:14 +0800 Message-Id: <20180209052915.12855-3-famz@redhat.com> In-Reply-To: <20180209052915.12855-1-famz@redhat.com> References: <20180209052915.12855-1-famz@redhat.com> Subject: [Qemu-devel] [PATCH v7 2/3] qemu-img: Document --force-share / -U List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: stefanha@redhat.com, qemu-block@nongnu.org, kchamart@redhat.com, eblake@redhat.com, Kevin Wolf , Max Reitz Signed-off-by: Fam Zheng 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 relaxed in a future release. +@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 used 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. -- 2.14.3