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[Qemu-block] [PATCH v4] qemu-img: Document --force-share / -U

From: Fam Zheng
Subject: [Qemu-block] [PATCH v4] qemu-img: Document --force-share / -U
Date: Tue, 12 Dec 2017 08:51:13 +0800

Signed-off-by: Fam Zheng <address@hidden>


v4: "images". [Kevin]

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..d93501f94f 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.
address@hidden --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 images 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.

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