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From 428eb7260718b69b1f3f421d03bce10b8785fc49 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Fri, 13 Mar 2020 12:34:39 +0000
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Subject: [PATCH 19/20] qapi: Add '@allow-write-only-overlay' feature for
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'blockdev-snapshot'
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20200313123439.10548-14-kwolf@redhat.com>
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Patchwork-id: 94290
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH v2 13/13] qapi: Add '@allow-write-only-overlay' feature for 'blockdev-snapshot'
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Bugzilla: 1790482 1805143
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Daniel P. Berrange <berrange@redhat.com>
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RH-Acked-by: Peter Krempa <pkrempa@redhat.com>
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From: Peter Krempa <pkrempa@redhat.com>
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Anounce that 'blockdev-snapshot' command's permissions allow changing
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of the backing file if the 'consistent_read' permission is not required.
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This is useful for libvirt to allow late opening of the backing chain
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during a blockdev-mirror.
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Signed-off-by: Peter Krempa <pkrempa@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Message-Id: <20200310113831.27293-8-kwolf@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit c6bdc312f30d5c7326aa2fdca3e0f98c15eb541a)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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qapi/block-core.json | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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diff --git a/qapi/block-core.json b/qapi/block-core.json
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index a1e85b0..a64ad81 100644
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--- a/qapi/block-core.json
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+++ b/qapi/block-core.json
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@@ -1541,6 +1541,12 @@
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#
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# For the arguments, see the documentation of BlockdevSnapshot.
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#
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+# Features:
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+# @allow-write-only-overlay: If present, the check whether this operation is safe
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+# was relaxed so that it can be used to change
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+# backing file of a destination of a blockdev-mirror.
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+# (since 5.0)
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+#
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# Since: 2.5
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#
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# Example:
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@@ -1561,7 +1567,8 @@
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#
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##
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{ 'command': 'blockdev-snapshot',
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- 'data': 'BlockdevSnapshot' }
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+ 'data': 'BlockdevSnapshot',
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+ 'features': [ 'allow-write-only-overlay' ] }
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##
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# @change-backing-file:
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--
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1.8.3.1
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