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[Qemu-block] [PULL 03/55] qemu-img: Document --force-share / -U

From: Kevin Wolf
Subject: [Qemu-block] [PULL 03/55] qemu-img: Document --force-share / -U
Date: Tue, 13 Feb 2018 18:04:37 +0100

From: Fam Zheng <address@hidden>

Signed-off-by: Fam Zheng <address@hidden>
Reviewed-by: Stefan Hajnoczi <address@hidden>
Reviewed-by: Kashyap Chamarthy <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
 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.
address@hidden --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.

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