5 # == Block device exports
8 { 'include': 'sockets.json' }
13 # Keep this type consistent with the nbd-server-start arguments. The only
14 # intended difference is using SocketAddress instead of SocketAddressLegacy.
16 # @addr: Address on which to listen.
17 # @tls-creds: ID of the TLS credentials object (since 2.6).
18 # @tls-authz: ID of the QAuthZ authorization object used to validate
19 # the client's x509 distinguished name. This object is
20 # is only resolved at time of use, so can be deleted and
21 # recreated on the fly while the NBD server is active.
22 # If missing, it will default to denying access (since 4.0).
23 # @max-connections: The maximum number of connections to allow at the same
24 # time, 0 for unlimited. (since 5.2; default: 0)
28 { 'struct': 'NbdServerOptions',
29 'data': { 'addr': 'SocketAddress',
32 '*max-connections': 'uint32' } }
37 # Start an NBD server listening on the given host and port. Block
38 # devices can then be exported using @nbd-server-add. The NBD
39 # server will present them as named exports; for example, another
40 # QEMU instance could refer to them as "nbd:HOST:PORT:exportname=NAME".
42 # Keep this type consistent with the NbdServerOptions type. The only intended
43 # difference is using SocketAddressLegacy instead of SocketAddress.
45 # @addr: Address on which to listen.
46 # @tls-creds: ID of the TLS credentials object (since 2.6).
47 # @tls-authz: ID of the QAuthZ authorization object used to validate
48 # the client's x509 distinguished name. This object is
49 # is only resolved at time of use, so can be deleted and
50 # recreated on the fly while the NBD server is active.
51 # If missing, it will default to denying access (since 4.0).
52 # @max-connections: The maximum number of connections to allow at the same
53 # time, 0 for unlimited. (since 5.2; default: 0)
55 # Returns: error if the server is already running.
59 { 'command': 'nbd-server-start',
60 'data': { 'addr': 'SocketAddressLegacy',
63 '*max-connections': 'uint32' } }
66 # @BlockExportOptionsNbd:
68 # An NBD block export (options shared between nbd-server-add and the NBD branch
69 # of block-export-add).
71 # @name: Export name. If unspecified, the @device parameter is used as the
72 # export name. (Since 2.12)
74 # @description: Free-form description of the export, up to 4096 bytes.
77 # @bitmap: Also export the dirty bitmap reachable from @device, so the
78 # NBD client can use NBD_OPT_SET_META_CONTEXT with
79 # "qemu:dirty-bitmap:NAME" to inspect the bitmap. (since 4.0)
83 { 'struct': 'BlockExportOptionsNbd',
84 'data': { '*name': 'str', '*description': 'str',
88 # @NbdServerAddOptions:
90 # An NBD block export.
92 # @device: The device name or node name of the node to be exported
94 # @writable: Whether clients should be able to write to the device via the
95 # NBD connection (default false).
99 { 'struct': 'NbdServerAddOptions',
100 'base': 'BlockExportOptionsNbd',
101 'data': { 'device': 'str',
102 '*writable': 'bool' } }
107 # Export a block node to QEMU's embedded NBD server.
109 # The export name will be used as the id for the resulting block export.
112 # @deprecated: This command is deprecated. Use @block-export-add instead.
114 # Returns: error if the server is not running, or export with the same name
119 { 'command': 'nbd-server-add',
120 'data': 'NbdServerAddOptions', 'boxed': true, 'features': ['deprecated'] }
123 # @BlockExportRemoveMode:
125 # Mode for removing a block export.
127 # @safe: Remove export if there are no existing connections, fail otherwise.
129 # @hard: Drop all connections immediately and remove export.
131 # Potential additional modes to be added in the future:
133 # hide: Just hide export from new clients, leave existing connections as is.
134 # Remove export after all clients are disconnected.
136 # soft: Hide export from new clients, answer with ESHUTDOWN for all further
137 # requests from existing clients.
141 {'enum': 'BlockExportRemoveMode', 'data': ['safe', 'hard']}
144 # @nbd-server-remove:
146 # Remove NBD export by name.
148 # @name: Block export id.
150 # @mode: Mode of command operation. See @BlockExportRemoveMode description.
154 # @deprecated: This command is deprecated. Use @block-export-del instead.
157 # - the server is not running
158 # - export is not found
159 # - mode is 'safe' and there are existing connections
163 { 'command': 'nbd-server-remove',
164 'data': {'name': 'str', '*mode': 'BlockExportRemoveMode'},
165 'features': ['deprecated'] }
170 # Stop QEMU's embedded NBD server, and unregister all devices previously
171 # added via @nbd-server-add.
175 { 'command': 'nbd-server-stop' }
180 # An enumeration of block export types
186 { 'enum': 'BlockExportType',
190 # @BlockExportOptions:
192 # Describes a block export, i.e. how single node should be exported on an
193 # external interface.
195 # @id: A unique identifier for the block export (across all export types)
197 # @node-name: The node name of the block node to be exported (since: 5.2)
199 # @writable: True if clients should be able to write to the export
202 # @writethrough: If true, caches are flushed after every write request to the
203 # export before completion is signalled. (since: 5.2;
208 { 'union': 'BlockExportOptions',
209 'base': { 'type': 'BlockExportType',
213 '*writethrough': 'bool' },
214 'discriminator': 'type',
216 'nbd': 'BlockExportOptionsNbd'
222 # Creates a new block export.
226 { 'command': 'block-export-add',
227 'data': 'BlockExportOptions', 'boxed': true }
232 # Request to remove a block export. This drops the user's reference to the
233 # export, but the export may still stay around after this command returns until
234 # the shutdown of the export has completed.
236 # @id: Block export id.
238 # @mode: Mode of command operation. See @BlockExportRemoveMode description.
241 # Returns: Error if the export is not found or @mode is 'safe' and the export
242 # is still in use (e.g. by existing client connections)
246 { 'command': 'block-export-del',
247 'data': { 'id': 'str', '*mode': 'BlockExportRemoveMode' } }
250 # @BLOCK_EXPORT_DELETED:
252 # Emitted when a block export is removed and its id can be reused.
254 # @id: Block export id.
258 { 'event': 'BLOCK_EXPORT_DELETED',
259 'data': { 'id': 'str' } }
264 # Information about a single block export.
266 # @id: The unique identifier for the block export
268 # @type: The block export type
270 # @node-name: The node name of the block node that is exported
272 # @shutting-down: True if the export is shutting down (e.g. after a
273 # block-export-del command, but before the shutdown has
278 { 'struct': 'BlockExportInfo',
279 'data': { 'id': 'str',
280 'type': 'BlockExportType',
282 'shutting-down': 'bool' } }
285 # @query-block-exports:
287 # Returns: A list of BlockExportInfo describing all block exports
291 { 'command': 'query-block-exports', 'returns': ['BlockExportInfo'] }