block: make 'top' argument to block-commit optional
Now that active layer block-commit is supported, the 'top' argument
no longer needs to be mandatory.
Change it to optional, with the default being the active layer in the
device chain.
[kwolf: Rebased and resolved conflict in tests/qemu-iotests/040]
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 1ea18b2..8c5fdb5 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -985,7 +985,7 @@
{
.name = "block-commit",
- .args_type = "device:B,base:s?,top:s,speed:o?",
+ .args_type = "device:B,base:s?,top:s?,speed:o?",
.mhandler.cmd_new = qmp_marshal_input_block_commit,
},
@@ -1003,7 +1003,8 @@
If not specified, this is the deepest backing image
(json-string, optional)
- "top": The file name of the backing image within the image chain,
- which contains the topmost data to be committed down.
+ which contains the topmost data to be committed down. If
+ not specified, this is the active layer. (json-string, optional)
If top == base, that is an error.
If top == active, the job will not be completed by itself,
