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block: make 'top' argument to block-commit optional

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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>
This commit is contained in:
Jeff Cody 2014-06-30 15:14:15 +02:00 • committed by Stefan Hajnoczi
parent c891e3bbc5
commit 7676e2c597
4 changed files with 39 additions and 17 deletions
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5
qmp-commands.hx
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@ -985,7 +985,7 @@ EQMP
{
.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 @@ Arguments:
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,