From: Peter Krempa <[email protected]> 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 <[email protected]> Signed-off-by: Kevin Wolf <[email protected]> Message-Id: <[email protected]> Signed-off-by: Kevin Wolf <[email protected]> --- qapi/block-core.json | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/qapi/block-core.json b/qapi/block-core.json index 9758fc48d2..91586fb1fb 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -1472,6 +1472,12 @@ # # For the arguments, see the documentation of BlockdevSnapshot. # +# Features: +# @allow-write-only-overlay: If present, the check whether this operation is safe +# was relaxed so that it can be used to change +# backing file of a destination of a blockdev-mirror. +# (since 5.0) +# # Since: 2.5 # # Example: @@ -1492,7 +1498,8 @@ # ## { 'command': 'blockdev-snapshot', - 'data': 'BlockdevSnapshot' } + 'data': 'BlockdevSnapshot', + 'features': [ 'allow-write-only-overlay' ] } ## # @change-backing-file: -- 2.20.1
