qapi/transaction.json

   1 # -*- Mode: Python -*-
   2 # vim: filetype=python
   3 #
   4
   5 ##
   6 # = Transactions
   7 ##
   8
   9 { 'include': 'block-core.json' }
  10
  11 ##
  12 # @Abort:
  13 #
  14 # This action can be used to test transaction failure.
  15 #
  16 # Since: 1.6
  17 ##
  18 { 'struct': 'Abort',
  19   'data': { } }
  20
  21 ##
  22 # @ActionCompletionMode:
  23 #
  24 # An enumeration of Transactional completion modes.
  25 #
  26 # @individual: Do not attempt to cancel any other Actions if any Actions fail
  27 #              after the Transaction request succeeds. All Actions that
  28 #              can complete successfully will do so without waiting on others.
  29 #              This is the default.
  30 #
  31 # @grouped: If any Action fails after the Transaction succeeds, cancel all
  32 #           Actions. Actions do not complete until all Actions are ready to
  33 #           complete. May be rejected by Actions that do not support this
  34 #           completion mode.
  35 #
  36 # Since: 2.5
  37 ##
  38 { 'enum': 'ActionCompletionMode',
  39   'data': [ 'individual', 'grouped' ] }
  40
  41 ##
  42 # @TransactionAction:
  43 #
  44 # A discriminated record of operations that can be performed with
  45 # @transaction. Action @type can be:
  46 #
  47 # - @abort: since 1.6
  48 # - @block-dirty-bitmap-add: since 2.5
  49 # - @block-dirty-bitmap-remove: since 4.2
  50 # - @block-dirty-bitmap-clear: since 2.5
  51 # - @block-dirty-bitmap-enable: since 4.0
  52 # - @block-dirty-bitmap-disable: since 4.0
  53 # - @block-dirty-bitmap-merge: since 4.0
  54 # - @blockdev-backup: since 2.3
  55 # - @blockdev-snapshot: since 2.5
  56 # - @blockdev-snapshot-internal-sync: since 1.7
  57 # - @blockdev-snapshot-sync: since 1.1
  58 # - @drive-backup: since 1.6
  59 #
  60 # Since: 1.1
  61 ##
  62 { 'union': 'TransactionAction',
  63   'data': {
  64        'abort': 'Abort',
  65        'block-dirty-bitmap-add': 'BlockDirtyBitmapAdd',
  66        'block-dirty-bitmap-remove': 'BlockDirtyBitmap',
  67        'block-dirty-bitmap-clear': 'BlockDirtyBitmap',
  68        'block-dirty-bitmap-enable': 'BlockDirtyBitmap',
  69        'block-dirty-bitmap-disable': 'BlockDirtyBitmap',
  70        'block-dirty-bitmap-merge': 'BlockDirtyBitmapMerge',
  71        'blockdev-backup': 'BlockdevBackup',
  72        'blockdev-snapshot': 'BlockdevSnapshot',
  73        'blockdev-snapshot-internal-sync': 'BlockdevSnapshotInternal',
  74        'blockdev-snapshot-sync': 'BlockdevSnapshotSync',
  75        'drive-backup': 'DriveBackup'
  76    } }
  77
  78 ##
  79 # @TransactionProperties:
  80 #
  81 # Optional arguments to modify the behavior of a Transaction.
  82 #
  83 # @completion-mode: Controls how jobs launched asynchronously by
  84 #                   Actions will complete or fail as a group.
  85 #                   See @ActionCompletionMode for details.
  86 #
  87 # Since: 2.5
  88 ##
  89 { 'struct': 'TransactionProperties',
  90   'data': {
  91        '*completion-mode': 'ActionCompletionMode'
  92   }
  93 }
  94
  95 ##
  96 # @transaction:
  97 #
  98 # Executes a number of transactionable QMP commands atomically. If any
  99 # operation fails, then the entire set of actions will be abandoned and the
 100 # appropriate error returned.
 101 #
 102 # For external snapshots, the dictionary contains the device, the file to use for
 103 # the new snapshot, and the format.  The default format, if not specified, is
 104 # qcow2.
 105 #
 106 # Each new snapshot defaults to being created by QEMU (wiping any
 107 # contents if the file already exists), but it is also possible to reuse
 108 # an externally-created file.  In the latter case, you should ensure that
 109 # the new image file has the same contents as the current one; QEMU cannot
 110 # perform any meaningful check.  Typically this is achieved by using the
 111 # current image file as the backing file for the new image.
 112 #
 113 # On failure, the original disks pre-snapshot attempt will be used.
 114 #
 115 # For internal snapshots, the dictionary contains the device and the snapshot's
 116 # name.  If an internal snapshot matching name already exists, the request will
 117 # be rejected.  Only some image formats support it, for example, qcow2, rbd,
 118 # and sheepdog.
 119 #
 120 # On failure, qemu will try delete the newly created internal snapshot in the
 121 # transaction.  When an I/O error occurs during deletion, the user needs to fix
 122 # it later with qemu-img or other command.
 123 #
 124 # @actions: List of @TransactionAction;
 125 #           information needed for the respective operations.
 126 #
 127 # @properties: structure of additional options to control the
 128 #              execution of the transaction. See @TransactionProperties
 129 #              for additional detail.
 130 #
 131 # Returns: nothing on success
 132 #
 133 #          Errors depend on the operations of the transaction
 134 #
 135 # Note: The transaction aborts on the first failure.  Therefore, there will be
 136 #       information on only one failed operation returned in an error condition, and
 137 #       subsequent actions will not have been attempted.
 138 #
 139 # Since: 1.1
 140 #
 141 # Example:
 142 #
 143 # -> { "execute": "transaction",
 144 #      "arguments": { "actions": [
 145 #          { "type": "blockdev-snapshot-sync", "data" : { "device": "ide-hd0",
 146 #                                      "snapshot-file": "/some/place/my-image",
 147 #                                      "format": "qcow2" } },
 148 #          { "type": "blockdev-snapshot-sync", "data" : { "node-name": "myfile",
 149 #                                      "snapshot-file": "/some/place/my-image2",
 150 #                                      "snapshot-node-name": "node3432",
 151 #                                      "mode": "existing",
 152 #                                      "format": "qcow2" } },
 153 #          { "type": "blockdev-snapshot-sync", "data" : { "device": "ide-hd1",
 154 #                                      "snapshot-file": "/some/place/my-image2",
 155 #                                      "mode": "existing",
 156 #                                      "format": "qcow2" } },
 157 #          { "type": "blockdev-snapshot-internal-sync", "data" : {
 158 #                                      "device": "ide-hd2",
 159 #                                      "name": "snapshot0" } } ] } }
 160 # <- { "return": {} }
 161 #
 162 ##
 163 { 'command': 'transaction',
 164   'data': { 'actions': [ 'TransactionAction' ],
 165             '*properties': 'TransactionProperties'
 166           }
 167 }