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block: add drive-backup QMP command

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@drive-backup

Start a point-in-time copy of a block device to a new destination.  The
status of ongoing drive-backup operations can be checked with
query-block-jobs where the BlockJobInfo.type field has the value 'backup'.
The operation can be stopped before it has completed using the
block-job-cancel command.

@device: the name of the device which should be copied.

@target: the target of the new image. If the file exists, or if it
         is a device, the existing file/device will be used as the new
         destination.  If it does not exist, a new file will be created.

@format: #optional the format of the new destination, default is to
         probe if @mode is 'existing', else the format of the source

@mode: #optional whether and how QEMU should create a new image, default is
       'absolute-paths'.

@speed: #optional the maximum speed, in bytes per second

@on-source-error: #optional the action to take on an error on the source,
                  default 'report'.  'stop' and 'enospc' can only be used
                  if the block device supports io-status (see BlockInfo).

@on-target-error: #optional the action to take on an error on the target,
                  default 'report' (no limitations, since this applies to
                  a different block device than @device).

Note that @on-source-error and @on-target-error only affect background I/O.
If an error occurs during a guest write request, the device's rerror/werror
actions will be used.

Returns: nothing on success
         If @device is not a valid block device, DeviceNotFound

Since 1.6

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi
2013-06-24 17:13:14 +02:00
committed by Kevin Wolf
parent ac3c5d831a
commit 99a9addf56
3 changed files with 189 additions and 0 deletions
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46
qmp-commands.hx
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@@ -911,6 +911,52 @@ EQMP
.mhandler.cmd_new = qmp_marshal_input_block_commit,
},
{
.name = "drive-backup",
.args_type = "device:B,target:s,speed:i?,mode:s?,format:s?,"
"on-source-error:s?,on-target-error:s?",
.mhandler.cmd_new = qmp_marshal_input_drive_backup,
},
SQMP
drive-backup
------------
Start a point-in-time copy of a block device to a new destination. The
status of ongoing drive-backup operations can be checked with
query-block-jobs where the BlockJobInfo.type field has the value 'backup'.
The operation can be stopped before it has completed using the
block-job-cancel command.
Arguments:
- "device": the name of the device which should be copied.
(json-string)
- "target": the target of the new image. If the file exists, or if it is a
device, the existing file/device will be used as the new
destination. If it does not exist, a new file will be created.
(json-string)
- "format": the format of the new destination, default is to probe if 'mode' is
'existing', else the format of the source
(json-string, optional)
- "mode": whether and how QEMU should create a new image
(NewImageMode, optional, default 'absolute-paths')
- "speed": the maximum speed, in bytes per second (json-int, optional)
- "on-source-error": the action to take on an error on the source, default
'report'. 'stop' and 'enospc' can only be used
if the block device supports io-status.
(BlockdevOnError, optional)
- "on-target-error": the action to take on an error on the target, default
'report' (no limitations, since this applies to
a different block device than device).
(BlockdevOnError, optional)
Example:
-> { "execute": "drive-backup", "arguments": { "device": "drive0",
"target": "backup.img" } }
<- { "return": {} }
EQMP
{
.name = "block-job-set-speed",
.args_type = "device:B,speed:o",