qapi/transaction.json

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