blockdev: add DriveBackup transaction

Enterprise / Virtualization / QEMU - Stefan Hajnoczi [redhat.com] - 28 June 2013 02:20 UTC

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).

3037f36 blockdev: add DriveBackup transaction
blockdev.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
qapi-schema.json | 40 +++++++++++++++++++++++++++++++++++++++-
2 files changed, 88 insertions(+), 1 deletion(-)

Upstream: git.qemu.org

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