Re: [Qemu-devel] [RFC PATCH 23/36] qmp: add drive-mirror command

[Eric Blake]

On 06/15/2012 09:05 AM, Paolo Bonzini wrote:
> This adds the monitor commands that start the mirroring job.
> 
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
>  blockdev.c       |  120 
> ++++++++++++++++++++++++++++++++++++++++++++++++++++--
>  hmp-commands.hx  |   21 ++++++++++
>  hmp.c            |   28 +++++++++++++
>  hmp.h            |    1 +
>  qapi-schema.json |   33 +++++++++++++++
>  qmp-commands.hx  |   41 +++++++++++++++++++
>  trace-events     |    2 +-
>  7 files changed, 242 insertions(+), 4 deletions(-)
> 

>  ##
> +# @drive-mirror
> +#
> +# Start mirroring a block device's writes to a new destination.
> +#
> +# @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 the
> +#          format of the source
> +#
> +# @mode: #optional whether and how QEMU should create a new image, default is
> +# 'absolute-paths'.

Indentation.

> +#
> +# @sync: what parts of the disk image should be copied to the destination
> +#        (all the disk, only the sectors allocated in the topmost image, or
> +#        only new I/O).

Document @peed:.

> +#
> +# Returns: nothing on success
> +#          If @device is not a valid block device, DeviceNotFound
> +#          If @target can't be opened, OpenFileFailed
> +#          If @format is invalid, InvalidBlockFormat
> +#
> +# Since 1.1

1.2

> +##
> +{ 'command': 'drive-mirror',
> +  'data': { 'device': 'str', 'target': 'str', '*format': 'str',
> +            'sync': 'MirrorSyncMode', '*mode': 'NewImageMode',
> +            '*speed': 'int' } }
> +
> +##
>  # @migrate_cancel
>  #
>  # Cancel the current executing migration process.
> diff --git a/qmp-commands.hx b/qmp-commands.hx
> index e2d77b6..cccea2f 100644
> --- a/qmp-commands.hx
> +++ b/qmp-commands.hx
> @@ -832,6 +832,47 @@ Example:
>  EQMP
>  
>      {
> +        .name       = "drive-mirror",
> +        .args_type  = "sync:s,device:B,target:s,sync:s?,format:s?",

sync: twice? and no speed: or mode:?


> +SQMP
> +drive-mirror
> +------------
> +
> +Start mirroring a block device's writes to a new destination. target
> +specifies the target of the new image. If the file exists, or if it is
> +a device, it will be used as the new destination for writes. If does not
> +exist, a new file will be created. format specifies the format of the
> +mirror image, default is to probe if mode='existing', else qcow2.

default is qcow2?  Earlier in this patch you said the same format as the
source.

-- 
Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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