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-LIVE BLOCK OPERATIONS
-=====================
-
-High level description of live block operations. Note these are not
-supported for use with the raw format at the moment.
-
-Note also that this document is incomplete and it currently only
-covers the 'stream' operation. Other operations supported by QEMU such
-as 'commit', 'mirror' and 'backup' are not described here yet. Please
-refer to the qapi/block-core.json file for an overview of those.
-
-Snapshot live merge
-===================
-
-Given a snapshot chain, described in this document in the following
-format:
-
-[A] <- [B] <- [C] <- [D] <- [E]
-
-Where the rightmost object ([E] in the example) described is the current
-image which the guest OS has write access to. To the left of it is its base
-image, and so on accordingly until the leftmost image, which has no
-base.
-
-The snapshot live merge operation transforms such a chain into a
-smaller one with fewer elements, such as this transformation relative
-to the first example:
-
-[A] <- [E]
-
-Data is copied in the right direction with destination being the
-rightmost image, but any other intermediate image can be specified
-instead. In this example data is copied from [C] into [D], so [D] can
-be backed by [B]:
-
-[A] <- [B] <- [D] <- [E]
-
-The operation is implemented in QEMU through image streaming facilities.
-
-The basic idea is to execute 'block_stream virtio0' while the guest is
-running. Progress can be monitored using 'info block-jobs'. When the
-streaming operation completes it raises a QMP event. 'block_stream'
-copies data from the backing file(s) into the active image. When finished,
-it adjusts the backing file pointer.
-
-The 'base' parameter specifies an image which data need not be
-streamed from. This image will be used as the backing file for the
-destination image when the operation is finished.
-
-In the first example above, the command would be:
-
-(qemu) block_stream virtio0 file-A.img
-
-In order to specify a destination image different from the active
-(rightmost) one we can use its node name instead.
-
-In the second example above, the command would be:
-
-(qemu) block_stream node-D file-B.img
-
-Live block copy
-===============
-
-To copy an in use image to another destination in the filesystem, one
-should create a live snapshot in the desired destination, then stream
-into that image. Example:
-
-(qemu) snapshot_blkdev ide0-hd0 /new-path/disk.img qcow2
-
-(qemu) block_stream ide0-hd0
-
-