• S
    block: add drive-backup QMP command · 99a9addf
    Stefan Hajnoczi 提交于
    @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: NEric Blake <eblake@redhat.com>
    Reviewed-by: NKevin Wolf <kwolf@redhat.com>
    Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
    Signed-off-by: NKevin Wolf <kwolf@redhat.com>
    99a9addf
blockdev.c 50.9 KB