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block: Accept node-name for change-backing-file

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In order to remove the necessity to use BlockBackend names in the
external API, we want to allow node-names everywhere. This converts
change-backing-file to accept a node-name without lifting the
restriction that we're operating at a root node.

In case of an invalid device name, the command returns the GenericError
error class now instead of DeviceNotFound, because this is what
qmp_get_root_bs() returns.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2016-06-23 14:20:24 +02:00
parent 75dfd402a7
commit 7b5dca3f02
3 changed files with 7 additions and 14 deletions
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3
qapi/block-core.json
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@ -998,7 +998,8 @@
# @image-node-name: The name of the block driver state node of the
# image to modify.
#
# @device: The name of the device that owns image-node-name.
# @device: The device name or node-name of the root node that owns
# image-node-name.
#
# @backing-file: The string to write as the backing file. This
# string is not validated, so care should be taken