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Diffstat (limited to 'qapi')
| -rw-r--r-- | qapi/transaction.json | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/qapi/transaction.json b/qapi/transaction.json new file mode 100644 index 0000000000..bd312792da --- /dev/null +++ b/qapi/transaction.json @@ -0,0 +1,158 @@ +# -*- Mode: Python -*- +# + +## +# = Transactions +## + +{ 'include': 'block.json' } + +## +# @Abort: +# +# This action can be used to test transaction failure. +# +# Since: 1.6 +## +{ 'struct': 'Abort', + 'data': { } } + +## +# @ActionCompletionMode: +# +# An enumeration of Transactional completion modes. +# +# @individual: Do not attempt to cancel any other Actions if any Actions fail +# after the Transaction request succeeds. All Actions that +# can complete successfully will do so without waiting on others. +# This is the default. +# +# @grouped: If any Action fails after the Transaction succeeds, cancel all +# Actions. Actions do not complete until all Actions are ready to +# complete. May be rejected by Actions that do not support this +# completion mode. +# +# Since: 2.5 +## +{ 'enum': 'ActionCompletionMode', + 'data': [ 'individual', 'grouped' ] } + +## +# @TransactionAction: +# +# A discriminated record of operations that can be performed with +# @transaction. Action @type can be: +# +# - @abort: since 1.6 +# - @block-dirty-bitmap-add: since 2.5 +# - @block-dirty-bitmap-clear: since 2.5 +# - @blockdev-backup: since 2.3 +# - @blockdev-snapshot: since 2.5 +# - @blockdev-snapshot-internal-sync: since 1.7 +# - @blockdev-snapshot-sync: since 1.1 +# - @drive-backup: since 1.6 +# +# Since: 1.1 +## +{ 'union': 'TransactionAction', + 'data': { + 'abort': 'Abort', + 'block-dirty-bitmap-add': 'BlockDirtyBitmapAdd', + 'block-dirty-bitmap-clear': 'BlockDirtyBitmap', + 'blockdev-backup': 'BlockdevBackup', + 'blockdev-snapshot': 'BlockdevSnapshot', + 'blockdev-snapshot-internal-sync': 'BlockdevSnapshotInternal', + 'blockdev-snapshot-sync': 'BlockdevSnapshotSync', + 'drive-backup': 'DriveBackup' + } } + +## +# @TransactionProperties: +# +# Optional arguments to modify the behavior of a Transaction. +# +# @completion-mode: Controls how jobs launched asynchronously by +# Actions will complete or fail as a group. +# See @ActionCompletionMode for details. +# +# Since: 2.5 +## +{ 'struct': 'TransactionProperties', + 'data': { + '*completion-mode': 'ActionCompletionMode' + } +} + +## +# @transaction: +# +# Executes a number of transactionable QMP commands atomically. If any +# operation fails, then the entire set of actions will be abandoned and the +# appropriate error returned. +# +# For external snapshots, the dictionary contains the device, the file to use for +# the new snapshot, and the format. The default format, if not specified, is +# qcow2. +# +# Each new snapshot defaults to being created by QEMU (wiping any +# contents if the file already exists), but it is also possible to reuse +# an externally-created file. In the latter case, you should ensure that +# the new image file has the same contents as the current one; QEMU cannot +# perform any meaningful check. Typically this is achieved by using the +# current image file as the backing file for the new image. +# +# On failure, the original disks pre-snapshot attempt will be used. +# +# For internal snapshots, the dictionary contains the device and the snapshot's +# name. If an internal snapshot matching name already exists, the request will +# be rejected. Only some image formats support it, for example, qcow2, rbd, +# and sheepdog. +# +# On failure, qemu will try delete the newly created internal snapshot in the +# transaction. When an I/O error occurs during deletion, the user needs to fix +# it later with qemu-img or other command. +# +# @actions: List of @TransactionAction; +# information needed for the respective operations. +# +# @properties: structure of additional options to control the +# execution of the transaction. See @TransactionProperties +# for additional detail. +# +# Returns: nothing on success +# +# Errors depend on the operations of the transaction +# +# Note: The transaction aborts on the first failure. Therefore, there will be +# information on only one failed operation returned in an error condition, and +# subsequent actions will not have been attempted. +# +# Since: 1.1 +# +# Example: +# +# -> { "execute": "transaction", +# "arguments": { "actions": [ +# { "type": "blockdev-snapshot-sync", "data" : { "device": "ide-hd0", +# "snapshot-file": "/some/place/my-image", +# "format": "qcow2" } }, +# { "type": "blockdev-snapshot-sync", "data" : { "node-name": "myfile", +# "snapshot-file": "/some/place/my-image2", +# "snapshot-node-name": "node3432", +# "mode": "existing", +# "format": "qcow2" } }, +# { "type": "blockdev-snapshot-sync", "data" : { "device": "ide-hd1", +# "snapshot-file": "/some/place/my-image2", +# "mode": "existing", +# "format": "qcow2" } }, +# { "type": "blockdev-snapshot-internal-sync", "data" : { +# "device": "ide-hd2", +# "name": "snapshot0" } } ] } } +# <- { "return": {} } +# +## +{ 'command': 'transaction', + 'data': { 'actions': [ 'TransactionAction' ], + '*properties': 'TransactionProperties' + } +} |