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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>
This commit is contained in:
Peter Krempa 2020-03-10 12:38:31 +01:00 committed by Kevin Wolf
parent 6a5f6403a1
commit c6bdc312f3
1 changed files with 8 additions and 1 deletions
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qapi/block-core.json
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@ -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: