From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50747) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eOKSr-0006tl-Fk for qemu-devel@nongnu.org; Mon, 11 Dec 2017 04:33:37 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eOKSq-0002HP-Is for qemu-devel@nongnu.org; Mon, 11 Dec 2017 04:33:33 -0500 From: Fam Zheng Date: Mon, 11 Dec 2017 17:33:14 +0800 Message-Id: <20171211093314.16974-1-famz@redhat.com> Subject: [Qemu-devel] [PATCH v3] qemu-img: Document --force-share / -U List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, kchamart@redhat.com, Kevin Wolf , Max Reitz , stefanha@redhat.com, eblake@redhat.com Signed-off-by: Fam Zheng --- v3: Document that the option is not allowed for read-write. [Stefan] 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..d85ace73f0 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. This option is only allowed when opening image in read-only mode. + @item fmt is the disk image format. It is guessed automatically in most cases. See below for a description of the supported disk formats. -- 2.14.3