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 # - @block-dirty-bitmap-enable: since 4.0
  50 # - @block-dirty-bitmap-disable: since 4.0
  51 # - @block-dirty-bitmap-merge: since 4.0
  52 # - @blockdev-backup: since 2.3
  53 # - @blockdev-snapshot: since 2.5
  54 # - @blockdev-snapshot-internal-sync: since 1.7
  55 # - @blockdev-snapshot-sync: since 1.1
  56 # - @drive-backup: since 1.6
  57 #
  58 # Since: 1.1
  59 ##
  60 { 'union': 'TransactionAction',
  61   'data': {
  62        'abort': 'Abort',
  63        'block-dirty-bitmap-add': 'BlockDirtyBitmapAdd',
  64        'block-dirty-bitmap-clear': 'BlockDirtyBitmap',
  65        'block-dirty-bitmap-enable': 'BlockDirtyBitmap',
  66        'block-dirty-bitmap-disable': 'BlockDirtyBitmap',
  67        'block-dirty-bitmap-merge': 'BlockDirtyBitmapMerge',
  68        'blockdev-backup': 'BlockdevBackup',
  69        'blockdev-snapshot': 'BlockdevSnapshot',
  70        'blockdev-snapshot-internal-sync': 'BlockdevSnapshotInternal',
  71        'blockdev-snapshot-sync': 'BlockdevSnapshotSync',
  72        'drive-backup': 'DriveBackup'
  73    } }
  74
  75 ##
  76 # @TransactionProperties:
  77 #
  78 # Optional arguments to modify the behavior of a Transaction.
  79 #
  80 # @completion-mode: Controls how jobs launched asynchronously by
  81 #                   Actions will complete or fail as a group.
  82 #                   See @ActionCompletionMode for details.
  83 #
  84 # Since: 2.5
  85 ##
  86 { 'struct': 'TransactionProperties',
  87   'data': {
  88        '*completion-mode': 'ActionCompletionMode'
  89   }
  90 }
  91
  92 ##
  93 # @transaction:
  94 #
  95 # Executes a number of transactionable QMP commands atomically. If any
  96 # operation fails, then the entire set of actions will be abandoned and the
  97 # appropriate error returned.
  98 #
  99 # For external snapshots, the dictionary contains the device, the file to use for
 100 # the new snapshot, and the format.  The default format, if not specified, is
 101 # qcow2.
 102 #
 103 # Each new snapshot defaults to being created by QEMU (wiping any
 104 # contents if the file already exists), but it is also possible to reuse
 105 # an externally-created file.  In the latter case, you should ensure that
 106 # the new image file has the same contents as the current one; QEMU cannot
 107 # perform any meaningful check.  Typically this is achieved by using the
 108 # current image file as the backing file for the new image.
 109 #
 110 # On failure, the original disks pre-snapshot attempt will be used.
 111 #
 112 # For internal snapshots, the dictionary contains the device and the snapshot's
 113 # name.  If an internal snapshot matching name already exists, the request will
 114 # be rejected.  Only some image formats support it, for example, qcow2, rbd,
 115 # and sheepdog.
 116 #
 117 # On failure, qemu will try delete the newly created internal snapshot in the
 118 # transaction.  When an I/O error occurs during deletion, the user needs to fix
 119 # it later with qemu-img or other command.
 120 #
 121 # @actions: List of @TransactionAction;
 122 #           information needed for the respective operations.
 123 #
 124 # @properties: structure of additional options to control the
 125 #              execution of the transaction. See @TransactionProperties
 126 #              for additional detail.
 127 #
 128 # Returns: nothing on success
 129 #
 130 #          Errors depend on the operations of the transaction
 131 #
 132 # Note: The transaction aborts on the first failure.  Therefore, there will be
 133 # information on only one failed operation returned in an error condition, and
 134 # subsequent actions will not have been attempted.
 135 #
 136 # Since: 1.1
 137 #
 138 # Example:
 139 #
 140 # -> { "execute": "transaction",
 141 #      "arguments": { "actions": [
 142 #          { "type": "blockdev-snapshot-sync", "data" : { "device": "ide-hd0",
 143 #                                      "snapshot-file": "/some/place/my-image",
 144 #                                      "format": "qcow2" } },
 145 #          { "type": "blockdev-snapshot-sync", "data" : { "node-name": "myfile",
 146 #                                      "snapshot-file": "/some/place/my-image2",
 147 #                                      "snapshot-node-name": "node3432",
 148 #                                      "mode": "existing",
 149 #                                      "format": "qcow2" } },
 150 #          { "type": "blockdev-snapshot-sync", "data" : { "device": "ide-hd1",
 151 #                                      "snapshot-file": "/some/place/my-image2",
 152 #                                      "mode": "existing",
 153 #                                      "format": "qcow2" } },
 154 #          { "type": "blockdev-snapshot-internal-sync", "data" : {
 155 #                                      "device": "ide-hd2",
 156 #                                      "name": "snapshot0" } } ] } }
 157 # <- { "return": {} }
 158 #
 159 ##
 160 { 'command': 'transaction',
 161   'data': { 'actions': [ 'TransactionAction' ],
 162             '*properties': 'TransactionProperties'
 163           }
 164 }