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From 20103e6ef28af483bb8aa54b1272fbd480b61aa4 Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Mon, 15 Jan 2018 06:15:18 +0100
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Subject: [PATCH 08/12] block: Open backing image in force share mode for size
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probe
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <20180115061518.16303-1-famz@redhat.com>
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Patchwork-id: 78570
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O-Subject: [RHV7.5 qemu-kvm-rhev PATCH] block: Open backing image in force share mode for size probe
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Bugzilla: 1526212
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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Management tools create overlays of running guests with qemu-img:
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$ qemu-img create -b /image/in/use.qcow2 -f qcow2 /overlay/image.qcow2
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but this doesn't work anymore due to image locking:
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qemu-img: /overlay/image.qcow2: Failed to get shared "write" lock
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Is another process using the image?
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Could not open backing image to determine size.
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Use the force share option to allow this use case again.
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit cc954f01e3c004aad081aa36736a17e842b80211)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/block.c b/block.c
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index b5736dd..17629ab 100644
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--- a/block.c
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+++ b/block.c
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@@ -4515,10 +4515,11 @@ void bdrv_img_create(const char *filename, const char *fmt,
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back_flags = flags;
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back_flags &= ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
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+ backing_options = qdict_new();
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if (backing_fmt) {
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- backing_options = qdict_new();
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qdict_put_str(backing_options, "driver", backing_fmt);
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}
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+ qdict_put_bool(backing_options, BDRV_OPT_FORCE_SHARE, true);
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bs = bdrv_open(full_backing, NULL, backing_options, back_flags,
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&local_err);
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--
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1.8.3.1
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