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commit: Add filter-node-name to block-commit

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Management tools need to be able to know about every node in the graph
and need a way to address them. Changing the graph structure was okay
because libvirt doesn't really manage the node level yet, but future
libvirt versions need to deal with both new and old version of qemu.

This new option to blockdev-commit allows the client to set a node-name
for the automatically inserted filter driver, and at the same time
serves as a witness for a future libvirt that this version of qemu does
automatically insert a filter driver.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2017-02-20 18:10:05 +01:00
parent 6cdbceb12c
commit 0db832f42e
7 changed files with 32 additions and 13 deletions
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8
qapi/block-core.json
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@ -1304,6 +1304,11 @@
#
# @speed: #optional the maximum speed, in bytes per second
#
# @filter-node-name: #optional the node name that should be assigned to the
# filter driver that the commit job inserts into the graph
# above @top. If this option is not given, a node name is
# autogenerated. (Since: 2.9)
#
# Returns: Nothing on success
# If commit or stream is already active on this device, DeviceInUse
# If @device does not exist, DeviceNotFound
@ -1323,7 +1328,8 @@
##
{ 'command': 'block-commit',
'data': { '*job-id': 'str', 'device': 'str', '*base': 'str', '*top': 'str',
'*backing-file': 'str', '*speed': 'int' } }
'*backing-file': 'str', '*speed': 'int',
'*filter-node-name': 'str' } }
##
# @drive-backup: