qapi/block-export.json - qemu - Git at Google

 # -*- Mode: Python -*-
 # vim: filetype=python

 ##
 # == Block device exports
 ##

 { 'include': 'sockets.json' }
 { 'include': 'block-core.json' }

 ##
 # @NbdServerOptions:
 #
 # Keep this type consistent with the nbd-server-start arguments.  The
 # only intended difference is using SocketAddress instead of
 # SocketAddressLegacy.
 #
 # @addr: Address on which to listen.
 #
 # @tls-creds: ID of the TLS credentials object (since 2.6).
 #
 # @tls-authz: ID of the QAuthZ authorization object used to validate
 #     the client's x509 distinguished name.  This object is is only
 #     resolved at time of use, so can be deleted and recreated on the
 #     fly while the NBD server is active.  If missing, it will default
 #     to denying access (since 4.0).
 #
 # @max-connections: The maximum number of connections to allow at the
 #     same time, 0 for unlimited.  Setting this to 1 also stops the
 #     server from advertising multiple client support (since 5.2;
 #     default: 0)
 #
 # Since: 4.2
 ##
 { 'struct': 'NbdServerOptions',
   'data': { 'addr': 'SocketAddress',
             '*tls-creds': 'str',
             '*tls-authz': 'str',
             '*max-connections': 'uint32' } }

 ##
 # @nbd-server-start:
 #
 # Start an NBD server listening on the given host and port.  Block
 # devices can then be exported using @nbd-server-add.  The NBD server
 # will present them as named exports; for example, another QEMU
 # instance could refer to them as "nbd:HOST:PORT:exportname=NAME".
 #
 # Keep this type consistent with the NbdServerOptions type.  The only
 # intended difference is using SocketAddressLegacy instead of
 # SocketAddress.
 #
 # @addr: Address on which to listen.
 #
 # @tls-creds: ID of the TLS credentials object (since 2.6).
 #
 # @tls-authz: ID of the QAuthZ authorization object used to validate
 #     the client's x509 distinguished name.  This object is is only
 #     resolved at time of use, so can be deleted and recreated on the
 #     fly while the NBD server is active.  If missing, it will default
 #     to denying access (since 4.0).
 #
 # @max-connections: The maximum number of connections to allow at the
 #     same time, 0 for unlimited.  Setting this to 1 also stops the
 #     server from advertising multiple client support (since 5.2;
 #     default: 0).
 #
 # Errors:
 #     - if the server is already running
 #
 # Since: 1.3
 ##
 { 'command': 'nbd-server-start',
   'data': { 'addr': 'SocketAddressLegacy',
             '*tls-creds': 'str',
             '*tls-authz': 'str',
             '*max-connections': 'uint32' },
   'allow-preconfig': true }

 ##
 # @BlockExportOptionsNbdBase:
 #
 # An NBD block export (common options shared between nbd-server-add
 # and the NBD branch of block-export-add).
 #
 # @name: Export name.  If unspecified, the @device parameter is used
 #     as the export name.  (Since 2.12)
 #
 # @description: Free-form description of the export, up to 4096 bytes.
 #     (Since 5.0)
 #
 # Since: 5.0
 ##
 { 'struct': 'BlockExportOptionsNbdBase',
   'data': { '*name': 'str', '*description': 'str' } }

 ##
 # @BlockExportOptionsNbd:
 #
 # An NBD block export (distinct options used in the NBD branch of
 # block-export-add).
 #
 # @bitmaps: Also export each of the named dirty bitmaps reachable from
 #     @device, so the NBD client can use NBD_OPT_SET_META_CONTEXT with
 #     the metadata context name "qemu:dirty-bitmap:BITMAP" to inspect
 #     each bitmap.  Since 7.1 bitmap may be specified by node/name
 #     pair.
 #
 # @allocation-depth: Also export the allocation depth map for @device,
 #     so the NBD client can use NBD_OPT_SET_META_CONTEXT with the
 #     metadata context name "qemu:allocation-depth" to inspect
 #     allocation details.  (since 5.2)
 #
 # Since: 5.2
 ##
 { 'struct': 'BlockExportOptionsNbd',
   'base': 'BlockExportOptionsNbdBase',
   'data': { '*bitmaps': ['BlockDirtyBitmapOrStr'],
             '*allocation-depth': 'bool' } }

 ##
 # @BlockExportOptionsVhostUserBlk:
 #
 # A vhost-user-blk block export.
 #
 # @addr: The vhost-user socket on which to listen.  Both 'unix' and
 #     'fd' SocketAddress types are supported.  Passed fds must be UNIX
 #     domain sockets.
 #
 # @logical-block-size: Logical block size in bytes.  Defaults to 512
 #     bytes.
 #
 # @num-queues: Number of request virtqueues.  Must be greater than 0.
 #     Defaults to 1.
 #
 # Since: 5.2
 ##
 { 'struct': 'BlockExportOptionsVhostUserBlk',
   'data': { 'addr': 'SocketAddress',
 	    '*logical-block-size': 'size',
             '*num-queues': 'uint16'} }

 ##
 # @FuseExportAllowOther:
 #
 # Possible allow_other modes for FUSE exports.
 #
 # @off: Do not pass allow_other as a mount option.
 #
 # @on: Pass allow_other as a mount option.
 #
 # @auto: Try mounting with allow_other first, and if that fails, retry
 #     without allow_other.
 #
 # Since: 6.1
 ##
 { 'enum': 'FuseExportAllowOther',
   'data': ['off', 'on', 'auto'] }

 ##
 # @BlockExportOptionsFuse:
 #
 # Options for exporting a block graph node on some (file) mountpoint
 # as a raw image.
 #
 # @mountpoint: Path on which to export the block device via FUSE.
 #     This must point to an existing regular file.
 #
 # @growable: Whether writes beyond the EOF should grow the block node
 #     accordingly.  (default: false)
 #
 # @allow-other: If this is off, only qemu's user is allowed access to
 #     this export.  That cannot be changed even with chmod or chown.
 #     Enabling this option will allow other users access to the export
 #     with the FUSE mount option "allow_other".  Note that using
 #     allow_other as a non-root user requires user_allow_other to be
 #     enabled in the global fuse.conf configuration file.  In auto
 #     mode (the default), the FUSE export driver will first attempt to
 #     mount the export with allow_other, and if that fails, try again
 #     without.  (since 6.1; default: auto)
 #
 # Since: 6.0
 ##
 { 'struct': 'BlockExportOptionsFuse',
   'data': { 'mountpoint': 'str',
             '*growable': 'bool',
             '*allow-other': 'FuseExportAllowOther' },
   'if': 'CONFIG_FUSE' }

 ##
 # @BlockExportOptionsVduseBlk:
 #
 # A vduse-blk block export.
 #
 # @name: the name of VDUSE device (must be unique across the host).
 #
 # @num-queues: the number of virtqueues.  Defaults to 1.
 #
 # @queue-size: the size of virtqueue.  Defaults to 256.
 #
 # @logical-block-size: Logical block size in bytes.  Range [512,
 #     PAGE_SIZE] and must be power of 2.  Defaults to 512 bytes.
 #
 # @serial: the serial number of virtio block device.  Defaults to
 #     empty string.
 #
 # Since: 7.1
 ##
 { 'struct': 'BlockExportOptionsVduseBlk',
   'data': { 'name': 'str',
             '*num-queues': 'uint16',
             '*queue-size': 'uint16',
             '*logical-block-size': 'size',
             '*serial': 'str' } }

 ##
 # @NbdServerAddOptions:
 #
 # An NBD block export, per legacy nbd-server-add command.
 #
 # @device: The device name or node name of the node to be exported
 #
 # @writable: Whether clients should be able to write to the device via
 #     the NBD connection (default false).
 #
 # @bitmap: Also export a single dirty bitmap reachable from @device,
 #     so the NBD client can use NBD_OPT_SET_META_CONTEXT with the
 #     metadata context name "qemu:dirty-bitmap:BITMAP" to inspect the
 #     bitmap (since 4.0).
 #
 # Since: 5.0
 ##
 { 'struct': 'NbdServerAddOptions',
   'base': 'BlockExportOptionsNbdBase',
   'data': { 'device': 'str',
             '*writable': 'bool', '*bitmap': 'str' } }

 ##
 # @nbd-server-add:
 #
 # Export a block node to QEMU's embedded NBD server.
 #
 # The export name will be used as the id for the resulting block
 # export.
 #
 # Features:
 #
 # @deprecated: This command is deprecated.  Use @block-export-add
 #     instead.
 #
 # Errors:
 #     - if the server is not running
 #     - if an export with the same name already exists
 #
 # Since: 1.3
 ##
 { 'command': 'nbd-server-add',
   'data': 'NbdServerAddOptions', 'boxed': true, 'features': ['deprecated'],
   'allow-preconfig': true }

 ##
 # @BlockExportRemoveMode:
 #
 # Mode for removing a block export.
 #
 # @safe: Remove export if there are no existing connections, fail
 #     otherwise.
 #
 # @hard: Drop all connections immediately and remove export.
 #
 # TODO: Potential additional modes to be added in the future:
 #
 #     - hide: Just hide export from new clients, leave existing
 #       connections as is.  Remove export after all clients are
 #       disconnected.
 #
 #     - soft: Hide export from new clients, answer with ESHUTDOWN for
 #       all further requests from existing clients.
 #
 # Since: 2.12
 ##
 {'enum': 'BlockExportRemoveMode', 'data': ['safe', 'hard']}

 ##
 # @nbd-server-remove:
 #
 # Remove NBD export by name.
 #
 # @name: Block export id.
 #
 # @mode: Mode of command operation.  See @BlockExportRemoveMode
 #     description.  Default is 'safe'.
 #
 # Features:
 #
 # @deprecated: This command is deprecated.  Use @block-export-del
 #     instead.
 #
 # Errors:
 #     - if the server is not running
 #     - if export is not found
 #     - if mode is 'safe' and there are existing connections
 #
 # Since: 2.12
 ##
 { 'command': 'nbd-server-remove',
   'data': {'name': 'str', '*mode': 'BlockExportRemoveMode'},
   'features': ['deprecated'],
   'allow-preconfig': true }

 ##
 # @nbd-server-stop:
 #
 # Stop QEMU's embedded NBD server, and unregister all devices
 # previously added via @nbd-server-add.
 #
 # Since: 1.3
 ##
 { 'command': 'nbd-server-stop',
   'allow-preconfig': true }

 ##
 # @BlockExportType:
 #
 # An enumeration of block export types
 #
 # @nbd: NBD export
 #
 # @vhost-user-blk: vhost-user-blk export (since 5.2)
 #
 # @fuse: FUSE export (since: 6.0)
 #
 # @vduse-blk: vduse-blk export (since 7.1)
 #
 # Since: 4.2
 ##
 { 'enum': 'BlockExportType',
   'data': [ 'nbd',
             { 'name': 'vhost-user-blk',
               'if': 'CONFIG_VHOST_USER_BLK_SERVER' },
             { 'name': 'fuse', 'if': 'CONFIG_FUSE' },
             { 'name': 'vduse-blk', 'if': 'CONFIG_VDUSE_BLK_EXPORT' } ] }

 ##
 # @BlockExportOptions:
 #
 # Describes a block export, i.e. how single node should be exported on
 # an external interface.
 #
 # @type: Block export type
 #
 # @id: A unique identifier for the block export (across all export
 #     types)
 #
 # @node-name: The node name of the block node to be exported
 #     (since: 5.2)
 #
 # @writable: True if clients should be able to write to the export
 #     (default false)
 #
 # @writethrough: If true, caches are flushed after every write request
 #     to the export before completion is signalled.  (since: 5.2;
 #     default: false)
 #
 # @iothread: The name of the iothread object where the export will
 #     run.  The default is to use the thread currently associated with
 #     the block node.  (since: 5.2)
 #
 # @fixed-iothread: True prevents the block node from being moved to
 #     another thread while the export is active.  If true and
 #     @iothread is given, export creation fails if the block node
 #     cannot be moved to the iothread.  The default is false.
 #     (since: 5.2)
 #
 # Since: 4.2
 ##
 { 'union': 'BlockExportOptions',
   'base': { 'type': 'BlockExportType',
             'id': 'str',
             '*fixed-iothread': 'bool',
             '*iothread': 'str',
             'node-name': 'str',
             '*writable': 'bool',
             '*writethrough': 'bool' },
   'discriminator': 'type',
   'data': {
       'nbd': 'BlockExportOptionsNbd',
       'vhost-user-blk': { 'type': 'BlockExportOptionsVhostUserBlk',
                           'if': 'CONFIG_VHOST_USER_BLK_SERVER' },
       'fuse': { 'type': 'BlockExportOptionsFuse',
                 'if': 'CONFIG_FUSE' },
       'vduse-blk': { 'type': 'BlockExportOptionsVduseBlk',
                      'if': 'CONFIG_VDUSE_BLK_EXPORT' }
    } }

 ##
 # @block-export-add:
 #
 # Creates a new block export.
 #
 # Since: 5.2
 ##
 { 'command': 'block-export-add',
   'data': 'BlockExportOptions', 'boxed': true,
   'allow-preconfig': true }

 ##
 # @block-export-del:
 #
 # Request to remove a block export.  This drops the user's reference
 # to the export, but the export may still stay around after this
 # command returns until the shutdown of the export has completed.
 #
 # @id: Block export id.
 #
 # @mode: Mode of command operation.  See @BlockExportRemoveMode
 #     description.  Default is 'safe'.
 #
 # Errors:
 #     - if the export is not found
 #     - if @mode is 'safe' and the export is still in use (e.g. by
 #       existing client connections)
 #
 # Since: 5.2
 ##
 { 'command': 'block-export-del',
   'data': { 'id': 'str', '*mode': 'BlockExportRemoveMode' },
   'allow-preconfig': true }

 ##
 # @BLOCK_EXPORT_DELETED:
 #
 # Emitted when a block export is removed and its id can be reused.
 #
 # @id: Block export id.
 #
 # Since: 5.2
 ##
 { 'event': 'BLOCK_EXPORT_DELETED',
   'data': { 'id': 'str' } }

 ##
 # @BlockExportInfo:
 #
 # Information about a single block export.
 #
 # @id: The unique identifier for the block export
 #
 # @type: The block export type
 #
 # @node-name: The node name of the block node that is exported
 #
 # @shutting-down: True if the export is shutting down (e.g. after a
 #     block-export-del command, but before the shutdown has completed)
 #
 # Since: 5.2
 ##
 { 'struct': 'BlockExportInfo',
   'data': { 'id': 'str',
             'type': 'BlockExportType',
             'node-name': 'str',
             'shutting-down': 'bool' } }

 ##
 # @query-block-exports:
 #
 # Returns: A list of BlockExportInfo describing all block exports
 #
 # Since: 5.2
 ##
 { 'command': 'query-block-exports', 'returns': ['BlockExportInfo'],
   'allow-preconfig': true }
	# -- Mode: Python --
	# vim: filetype=python

	##
	# == Block device exports
	##

	{ 'include': 'sockets.json' }
	{ 'include': 'block-core.json' }

	##
	# @NbdServerOptions:
	#
	# Keep this type consistent with the nbd-server-start arguments. The
	# only intended difference is using SocketAddress instead of
	# SocketAddressLegacy.
	#
	# @addr: Address on which to listen.
	#
	# @tls-creds: ID of the TLS credentials object (since 2.6).
	#
	# @tls-authz: ID of the QAuthZ authorization object used to validate
	# the client's x509 distinguished name. This object is is only
	# resolved at time of use, so can be deleted and recreated on the
	# fly while the NBD server is active. If missing, it will default
	# to denying access (since 4.0).
	#
	# @max-connections: The maximum number of connections to allow at the
	# same time, 0 for unlimited. Setting this to 1 also stops the
	# server from advertising multiple client support (since 5.2;
	# default: 0)
	#
	# Since: 4.2
	##
	{ 'struct': 'NbdServerOptions',
	'data': { 'addr': 'SocketAddress',
	'*tls-creds': 'str',
	'*tls-authz': 'str',
	'*max-connections': 'uint32' } }

	##
	# @nbd-server-start:
	#
	# Start an NBD server listening on the given host and port. Block
	# devices can then be exported using @nbd-server-add. The NBD server
	# will present them as named exports; for example, another QEMU
	# instance could refer to them as "nbd:HOST:PORT:exportname=NAME".
	#
	# Keep this type consistent with the NbdServerOptions type. The only
	# intended difference is using SocketAddressLegacy instead of
	# SocketAddress.
	#
	# @addr: Address on which to listen.
	#
	# @tls-creds: ID of the TLS credentials object (since 2.6).
	#
	# @tls-authz: ID of the QAuthZ authorization object used to validate
	# the client's x509 distinguished name. This object is is only
	# resolved at time of use, so can be deleted and recreated on the
	# fly while the NBD server is active. If missing, it will default
	# to denying access (since 4.0).
	#
	# @max-connections: The maximum number of connections to allow at the
	# same time, 0 for unlimited. Setting this to 1 also stops the
	# server from advertising multiple client support (since 5.2;
	# default: 0).
	#
	# Errors:
	# - if the server is already running
	#
	# Since: 1.3
	##
	{ 'command': 'nbd-server-start',
	'data': { 'addr': 'SocketAddressLegacy',
	'*tls-creds': 'str',
	'*tls-authz': 'str',
	'*max-connections': 'uint32' },
	'allow-preconfig': true }

	##
	# @BlockExportOptionsNbdBase:
	#
	# An NBD block export (common options shared between nbd-server-add
	# and the NBD branch of block-export-add).
	#
	# @name: Export name. If unspecified, the @device parameter is used
	# as the export name. (Since 2.12)
	#
	# @description: Free-form description of the export, up to 4096 bytes.
	# (Since 5.0)
	#
	# Since: 5.0
	##
	{ 'struct': 'BlockExportOptionsNbdBase',
	'data': { 'name': 'str', 'description': 'str' } }

	##
	# @BlockExportOptionsNbd:
	#
	# An NBD block export (distinct options used in the NBD branch of
	# block-export-add).
	#
	# @bitmaps: Also export each of the named dirty bitmaps reachable from
	# @device, so the NBD client can use NBD_OPT_SET_META_CONTEXT with
	# the metadata context name "qemu:dirty-bitmap:BITMAP" to inspect
	# each bitmap. Since 7.1 bitmap may be specified by node/name
	# pair.
	#
	# @allocation-depth: Also export the allocation depth map for @device,
	# so the NBD client can use NBD_OPT_SET_META_CONTEXT with the
	# metadata context name "qemu:allocation-depth" to inspect
	# allocation details. (since 5.2)
	#
	# Since: 5.2
	##
	{ 'struct': 'BlockExportOptionsNbd',
	'base': 'BlockExportOptionsNbdBase',
	'data': { '*bitmaps': ['BlockDirtyBitmapOrStr'],
	'*allocation-depth': 'bool' } }

	##
	# @BlockExportOptionsVhostUserBlk:
	#
	# A vhost-user-blk block export.
	#
	# @addr: The vhost-user socket on which to listen. Both 'unix' and
	# 'fd' SocketAddress types are supported. Passed fds must be UNIX
	# domain sockets.
	#
	# @logical-block-size: Logical block size in bytes. Defaults to 512
	# bytes.
	#
	# @num-queues: Number of request virtqueues. Must be greater than 0.
	# Defaults to 1.
	#
	# Since: 5.2
	##
	{ 'struct': 'BlockExportOptionsVhostUserBlk',
	'data': { 'addr': 'SocketAddress',
	'*logical-block-size': 'size',
	'*num-queues': 'uint16'} }

	##
	# @FuseExportAllowOther:
	#
	# Possible allow_other modes for FUSE exports.
	#
	# @off: Do not pass allow_other as a mount option.
	#
	# @on: Pass allow_other as a mount option.
	#
	# @auto: Try mounting with allow_other first, and if that fails, retry
	# without allow_other.
	#
	# Since: 6.1
	##
	{ 'enum': 'FuseExportAllowOther',
	'data': ['off', 'on', 'auto'] }

	##
	# @BlockExportOptionsFuse:
	#
	# Options for exporting a block graph node on some (file) mountpoint
	# as a raw image.
	#
	# @mountpoint: Path on which to export the block device via FUSE.
	# This must point to an existing regular file.
	#
	# @growable: Whether writes beyond the EOF should grow the block node
	# accordingly. (default: false)
	#
	# @allow-other: If this is off, only qemu's user is allowed access to
	# this export. That cannot be changed even with chmod or chown.
	# Enabling this option will allow other users access to the export
	# with the FUSE mount option "allow_other". Note that using
	# allow_other as a non-root user requires user_allow_other to be
	# enabled in the global fuse.conf configuration file. In auto
	# mode (the default), the FUSE export driver will first attempt to
	# mount the export with allow_other, and if that fails, try again
	# without. (since 6.1; default: auto)
	#
	# Since: 6.0
	##
	{ 'struct': 'BlockExportOptionsFuse',
	'data': { 'mountpoint': 'str',
	'*growable': 'bool',
	'*allow-other': 'FuseExportAllowOther' },
	'if': 'CONFIG_FUSE' }

	##
	# @BlockExportOptionsVduseBlk:
	#
	# A vduse-blk block export.
	#
	# @name: the name of VDUSE device (must be unique across the host).
	#
	# @num-queues: the number of virtqueues. Defaults to 1.
	#
	# @queue-size: the size of virtqueue. Defaults to 256.
	#
	# @logical-block-size: Logical block size in bytes. Range [512,
	# PAGE_SIZE] and must be power of 2. Defaults to 512 bytes.
	#
	# @serial: the serial number of virtio block device. Defaults to
	# empty string.
	#
	# Since: 7.1
	##
	{ 'struct': 'BlockExportOptionsVduseBlk',
	'data': { 'name': 'str',
	'*num-queues': 'uint16',
	'*queue-size': 'uint16',
	'*logical-block-size': 'size',
	'*serial': 'str' } }

	##
	# @NbdServerAddOptions:
	#
	# An NBD block export, per legacy nbd-server-add command.
	#
	# @device: The device name or node name of the node to be exported
	#
	# @writable: Whether clients should be able to write to the device via
	# the NBD connection (default false).
	#
	# @bitmap: Also export a single dirty bitmap reachable from @device,
	# so the NBD client can use NBD_OPT_SET_META_CONTEXT with the
	# metadata context name "qemu:dirty-bitmap:BITMAP" to inspect the
	# bitmap (since 4.0).
	#
	# Since: 5.0
	##
	{ 'struct': 'NbdServerAddOptions',
	'base': 'BlockExportOptionsNbdBase',
	'data': { 'device': 'str',
	'writable': 'bool', 'bitmap': 'str' } }

	##
	# @nbd-server-add:
	#
	# Export a block node to QEMU's embedded NBD server.
	#
	# The export name will be used as the id for the resulting block
	# export.
	#
	# Features:
	#
	# @deprecated: This command is deprecated. Use @block-export-add
	# instead.
	#
	# Errors:
	# - if the server is not running
	# - if an export with the same name already exists
	#
	# Since: 1.3
	##
	{ 'command': 'nbd-server-add',
	'data': 'NbdServerAddOptions', 'boxed': true, 'features': ['deprecated'],
	'allow-preconfig': true }

	##
	# @BlockExportRemoveMode:
	#
	# Mode for removing a block export.
	#
	# @safe: Remove export if there are no existing connections, fail
	# otherwise.
	#
	# @hard: Drop all connections immediately and remove export.
	#
	# TODO: Potential additional modes to be added in the future:
	#
	# - hide: Just hide export from new clients, leave existing
	# connections as is. Remove export after all clients are
	# disconnected.
	#
	# - soft: Hide export from new clients, answer with ESHUTDOWN for
	# all further requests from existing clients.
	#
	# Since: 2.12
	##
	{'enum': 'BlockExportRemoveMode', 'data': ['safe', 'hard']}

	##
	# @nbd-server-remove:
	#
	# Remove NBD export by name.
	#
	# @name: Block export id.
	#
	# @mode: Mode of command operation. See @BlockExportRemoveMode
	# description. Default is 'safe'.
	#
	# Features:
	#
	# @deprecated: This command is deprecated. Use @block-export-del
	# instead.
	#
	# Errors:
	# - if the server is not running
	# - if export is not found
	# - if mode is 'safe' and there are existing connections
	#
	# Since: 2.12
	##
	{ 'command': 'nbd-server-remove',
	'data': {'name': 'str', '*mode': 'BlockExportRemoveMode'},
	'features': ['deprecated'],
	'allow-preconfig': true }

	##
	# @nbd-server-stop:
	#
	# Stop QEMU's embedded NBD server, and unregister all devices
	# previously added via @nbd-server-add.
	#
	# Since: 1.3
	##
	{ 'command': 'nbd-server-stop',
	'allow-preconfig': true }

	##
	# @BlockExportType:
	#
	# An enumeration of block export types
	#
	# @nbd: NBD export
	#
	# @vhost-user-blk: vhost-user-blk export (since 5.2)
	#
	# @fuse: FUSE export (since: 6.0)
	#
	# @vduse-blk: vduse-blk export (since 7.1)
	#
	# Since: 4.2
	##
	{ 'enum': 'BlockExportType',
	'data': [ 'nbd',
	{ 'name': 'vhost-user-blk',
	'if': 'CONFIG_VHOST_USER_BLK_SERVER' },
	{ 'name': 'fuse', 'if': 'CONFIG_FUSE' },
	{ 'name': 'vduse-blk', 'if': 'CONFIG_VDUSE_BLK_EXPORT' } ] }

	##
	# @BlockExportOptions:
	#
	# Describes a block export, i.e. how single node should be exported on
	# an external interface.
	#
	# @type: Block export type
	#
	# @id: A unique identifier for the block export (across all export
	# types)
	#
	# @node-name: The node name of the block node to be exported
	# (since: 5.2)
	#
	# @writable: True if clients should be able to write to the export
	# (default false)
	#
	# @writethrough: If true, caches are flushed after every write request
	# to the export before completion is signalled. (since: 5.2;
	# default: false)
	#
	# @iothread: The name of the iothread object where the export will
	# run. The default is to use the thread currently associated with
	# the block node. (since: 5.2)
	#
	# @fixed-iothread: True prevents the block node from being moved to
	# another thread while the export is active. If true and
	# @iothread is given, export creation fails if the block node
	# cannot be moved to the iothread. The default is false.
	# (since: 5.2)
	#
	# Since: 4.2
	##
	{ 'union': 'BlockExportOptions',
	'base': { 'type': 'BlockExportType',
	'id': 'str',
	'*fixed-iothread': 'bool',
	'*iothread': 'str',
	'node-name': 'str',
	'*writable': 'bool',
	'*writethrough': 'bool' },
	'discriminator': 'type',
	'data': {
	'nbd': 'BlockExportOptionsNbd',
	'vhost-user-blk': { 'type': 'BlockExportOptionsVhostUserBlk',
	'if': 'CONFIG_VHOST_USER_BLK_SERVER' },
	'fuse': { 'type': 'BlockExportOptionsFuse',
	'if': 'CONFIG_FUSE' },
	'vduse-blk': { 'type': 'BlockExportOptionsVduseBlk',
	'if': 'CONFIG_VDUSE_BLK_EXPORT' }
	} }

	##
	# @block-export-add:
	#
	# Creates a new block export.
	#
	# Since: 5.2
	##
	{ 'command': 'block-export-add',
	'data': 'BlockExportOptions', 'boxed': true,
	'allow-preconfig': true }

	##
	# @block-export-del:
	#
	# Request to remove a block export. This drops the user's reference
	# to the export, but the export may still stay around after this
	# command returns until the shutdown of the export has completed.
	#
	# @id: Block export id.
	#
	# @mode: Mode of command operation. See @BlockExportRemoveMode
	# description. Default is 'safe'.
	#
	# Errors:
	# - if the export is not found
	# - if @mode is 'safe' and the export is still in use (e.g. by
	# existing client connections)
	#
	# Since: 5.2
	##
	{ 'command': 'block-export-del',
	'data': { 'id': 'str', '*mode': 'BlockExportRemoveMode' },
	'allow-preconfig': true }

	##
	# @BLOCK_EXPORT_DELETED:
	#
	# Emitted when a block export is removed and its id can be reused.
	#
	# @id: Block export id.
	#
	# Since: 5.2
	##
	{ 'event': 'BLOCK_EXPORT_DELETED',
	'data': { 'id': 'str' } }

	##
	# @BlockExportInfo:
	#
	# Information about a single block export.
	#
	# @id: The unique identifier for the block export
	#
	# @type: The block export type
	#
	# @node-name: The node name of the block node that is exported
	#
	# @shutting-down: True if the export is shutting down (e.g. after a
	# block-export-del command, but before the shutdown has completed)
	#
	# Since: 5.2
	##
	{ 'struct': 'BlockExportInfo',
	'data': { 'id': 'str',
	'type': 'BlockExportType',
	'node-name': 'str',
	'shutting-down': 'bool' } }

	##
	# @query-block-exports:
	#
	# Returns: A list of BlockExportInfo describing all block exports
	#
	# Since: 5.2
	##
	{ 'command': 'query-block-exports', 'returns': ['BlockExportInfo'],
	'allow-preconfig': true }