aboutsummaryrefslogtreecommitdiff
path: root/qapi/transaction.json
blob: 381a2df78283bb658bf3d181a917f7315808c440 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
# -*- Mode: Python -*-
# vim: filetype=python
#

##
# = Transactions
##

{ 'include': 'block-core.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' ] }

##
# @TransactionActionKind:
#
# @abort: Since 1.6
# @block-dirty-bitmap-add: Since 2.5
# @block-dirty-bitmap-remove: Since 4.2
# @block-dirty-bitmap-clear: Since 2.5
# @block-dirty-bitmap-enable: Since 4.0
# @block-dirty-bitmap-disable: Since 4.0
# @block-dirty-bitmap-merge: Since 4.0
# @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
#
# Features:
# @deprecated: Member @drive-backup is deprecated.  Use member
#              @blockdev-backup instead.
#
# Since: 1.1
##
{ 'enum': 'TransactionActionKind',
  'data': [ 'abort', 'block-dirty-bitmap-add', 'block-dirty-bitmap-remove',
            'block-dirty-bitmap-clear', 'block-dirty-bitmap-enable',
            'block-dirty-bitmap-disable', 'block-dirty-bitmap-merge',
            'blockdev-backup', 'blockdev-snapshot',
            'blockdev-snapshot-internal-sync', 'blockdev-snapshot-sync',
            { 'name': 'drive-backup', 'features': [ 'deprecated' ] } ] }

##
# @AbortWrapper:
#
# Since: 1.6
##
{ 'struct': 'AbortWrapper',
  'data': { 'data': 'Abort' } }

##
# @BlockDirtyBitmapAddWrapper:
#
# Since: 2.5
##
{ 'struct': 'BlockDirtyBitmapAddWrapper',
  'data': { 'data': 'BlockDirtyBitmapAdd' } }

##
# @BlockDirtyBitmapWrapper:
#
# Since: 2.5
##
{ 'struct': 'BlockDirtyBitmapWrapper',
  'data': { 'data': 'BlockDirtyBitmap' } }

##
# @BlockDirtyBitmapMergeWrapper:
#
# Since: 4.0
##
{ 'struct': 'BlockDirtyBitmapMergeWrapper',
  'data': { 'data': 'BlockDirtyBitmapMerge' } }

##
# @BlockdevBackupWrapper:
#
# Since: 2.3
##
{ 'struct': 'BlockdevBackupWrapper',
  'data': { 'data': 'BlockdevBackup' } }

##
# @BlockdevSnapshotWrapper:
#
# Since: 2.5
##
{ 'struct': 'BlockdevSnapshotWrapper',
  'data': { 'data': 'BlockdevSnapshot' } }

##
# @BlockdevSnapshotInternalWrapper:
#
# Since: 1.7
##
{ 'struct': 'BlockdevSnapshotInternalWrapper',
  'data': { 'data': 'BlockdevSnapshotInternal' } }

##
# @BlockdevSnapshotSyncWrapper:
#
# Since: 1.1
##
{ 'struct': 'BlockdevSnapshotSyncWrapper',
  'data': { 'data': 'BlockdevSnapshotSync' } }

##
# @DriveBackupWrapper:
#
# Since: 1.6
##
{ 'struct': 'DriveBackupWrapper',
  'data': { 'data': 'DriveBackup' } }

##
# @TransactionAction:
#
# A discriminated record of operations that can be performed with
# @transaction.
#
# Since: 1.1
##
{ 'union': 'TransactionAction',
  'base': { 'type': 'TransactionActionKind' },
  'discriminator': 'type',
  'data': {
       'abort': 'AbortWrapper',
       'block-dirty-bitmap-add': 'BlockDirtyBitmapAddWrapper',
       'block-dirty-bitmap-remove': 'BlockDirtyBitmapWrapper',
       'block-dirty-bitmap-clear': 'BlockDirtyBitmapWrapper',
       'block-dirty-bitmap-enable': 'BlockDirtyBitmapWrapper',
       'block-dirty-bitmap-disable': 'BlockDirtyBitmapWrapper',
       'block-dirty-bitmap-merge': 'BlockDirtyBitmapMergeWrapper',
       'blockdev-backup': 'BlockdevBackupWrapper',
       'blockdev-snapshot': 'BlockdevSnapshotWrapper',
       'blockdev-snapshot-internal-sync': 'BlockdevSnapshotInternalWrapper',
       'blockdev-snapshot-sync': 'BlockdevSnapshotSyncWrapper',
       'drive-backup': 'DriveBackupWrapper'
   } }

##
# @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, and rbd,
#
# 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'
          }
}