Commit c6bdc312 authored by Peter Krempa's avatar Peter Krempa Committed by Kevin Wolf
Browse files

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: default avatarPeter Krempa <pkrempa@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
Message-Id: <20200310113831.27293-8-kwolf@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 6a5f6403

qapi/block-core.json

+8 −1
Original line number Diff line number Diff line
@@ -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: