« Previous | Next » 

Revision 3037f364

ID3037f36446eb3556c14757ac468463c3902f331b

Added by Stefan Hajnoczi almost 11 years ago

blockdev: add DriveBackup transaction

This patch adds a transactional version of the drive-backup QMP command.
It allows atomic snapshots of multiple drives along with automatic
cleanup if there is a failure to start one of the backup jobs.

Note that QMP events are emitted for block job completion/cancellation
and the block job will be listed by query-block-jobs.

@device: the name of the device whose writes should be mirrored.

@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).

Reviewed-by: Eric Blake <>
Reviewed-by: Kevin Wolf <>
Signed-off-by: Stefan Hajnoczi <>
Signed-off-by: Kevin Wolf <>

Files

  • added
  • modified
  • copied
  • renamed
  • deleted

View differences