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qapi: Add '@allow-write-only-overlay' feature for 'blockdev-snapshot'
Anounce that 'blockdev-snapshot' command's permissions allow changing of the backing file if the 'consistent_read' permission is not required. This is useful for libvirt to allow late opening of the backing chain during a blockdev-mirror. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20200310113831.27293-8-kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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@ -1472,6 +1472,12 @@
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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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#
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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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