qemu-nbd allows use of writethrough cache modes, which mean that write requests made through NBD will cause a flush before they complete. Expose the same functionality in block-export-add. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200924152717.287415-10-kwolf@redhat.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
196 lines
5.4 KiB
Python
196 lines
5.4 KiB
Python
# -*- Mode: Python -*-
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# vim: filetype=python
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##
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# == Block device exports
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##
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{ 'include': 'sockets.json' }
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##
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# @NbdServerOptions:
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#
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# Keep this type consistent with the nbd-server-start arguments. The only
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# intended difference is using SocketAddress instead of SocketAddressLegacy.
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#
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# @addr: Address on which to listen.
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# @tls-creds: ID of the TLS credentials object (since 2.6).
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# @tls-authz: ID of the QAuthZ authorization object used to validate
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# the client's x509 distinguished name. This object is
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# is only resolved at time of use, so can be deleted and
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# recreated on the fly while the NBD server is active.
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# If missing, it will default to denying access (since 4.0).
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# @max-connections: The maximum number of connections to allow at the same
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# time, 0 for unlimited. (since 5.2; default: 0)
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#
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# Since: 4.2
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##
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{ 'struct': 'NbdServerOptions',
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'data': { 'addr': 'SocketAddress',
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'*tls-creds': 'str',
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'*tls-authz': 'str',
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'*max-connections': 'uint32' } }
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##
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# @nbd-server-start:
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#
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# Start an NBD server listening on the given host and port. Block
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# devices can then be exported using @nbd-server-add. The NBD
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# server will present them as named exports; for example, another
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# QEMU instance could refer to them as "nbd:HOST:PORT:exportname=NAME".
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#
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# Keep this type consistent with the NbdServerOptions type. The only intended
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# difference is using SocketAddressLegacy instead of SocketAddress.
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#
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# @addr: Address on which to listen.
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# @tls-creds: ID of the TLS credentials object (since 2.6).
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# @tls-authz: ID of the QAuthZ authorization object used to validate
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# the client's x509 distinguished name. This object is
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# is only resolved at time of use, so can be deleted and
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# recreated on the fly while the NBD server is active.
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# If missing, it will default to denying access (since 4.0).
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# @max-connections: The maximum number of connections to allow at the same
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# time, 0 for unlimited. (since 5.2; default: 0)
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#
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# Returns: error if the server is already running.
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#
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# Since: 1.3.0
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##
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{ 'command': 'nbd-server-start',
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'data': { 'addr': 'SocketAddressLegacy',
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'*tls-creds': 'str',
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'*tls-authz': 'str',
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'*max-connections': 'uint32' } }
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##
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# @BlockExportOptionsNbd:
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#
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# An NBD block export.
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#
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# @device: The device name or node name of the node to be exported
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#
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# @name: Export name. If unspecified, the @device parameter is used as the
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# export name. (Since 2.12)
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#
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# @description: Free-form description of the export, up to 4096 bytes.
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# (Since 5.0)
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#
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# @writable: Whether clients should be able to write to the device via the
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# NBD connection (default false).
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#
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# @bitmap: Also export the dirty bitmap reachable from @device, so the
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# NBD client can use NBD_OPT_SET_META_CONTEXT with
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# "qemu:dirty-bitmap:NAME" to inspect the bitmap. (since 4.0)
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#
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# Since: 5.0
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##
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{ 'struct': 'BlockExportOptionsNbd',
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'data': {'device': 'str', '*name': 'str', '*description': 'str',
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'*writable': 'bool', '*bitmap': 'str' } }
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##
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# @nbd-server-add:
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#
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# Export a block node to QEMU's embedded NBD server.
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#
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# Returns: error if the server is not running, or export with the same name
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# already exists.
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#
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# Since: 1.3.0
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##
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{ 'command': 'nbd-server-add',
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'data': 'BlockExportOptionsNbd', 'boxed': true }
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##
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# @NbdServerRemoveMode:
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#
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# Mode for removing an NBD export.
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#
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# @safe: Remove export if there are no existing connections, fail otherwise.
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#
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# @hard: Drop all connections immediately and remove export.
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#
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# Potential additional modes to be added in the future:
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#
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# hide: Just hide export from new clients, leave existing connections as is.
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# Remove export after all clients are disconnected.
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#
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# soft: Hide export from new clients, answer with ESHUTDOWN for all further
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# requests from existing clients.
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#
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# Since: 2.12
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##
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{'enum': 'NbdServerRemoveMode', 'data': ['safe', 'hard']}
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##
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# @nbd-server-remove:
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#
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# Remove NBD export by name.
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#
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# @name: Export name.
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#
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# @mode: Mode of command operation. See @NbdServerRemoveMode description.
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# Default is 'safe'.
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#
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# Returns: error if
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# - the server is not running
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# - export is not found
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# - mode is 'safe' and there are existing connections
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#
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# Since: 2.12
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##
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{ 'command': 'nbd-server-remove',
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'data': {'name': 'str', '*mode': 'NbdServerRemoveMode'} }
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##
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# @nbd-server-stop:
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#
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# Stop QEMU's embedded NBD server, and unregister all devices previously
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# added via @nbd-server-add.
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#
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# Since: 1.3.0
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##
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{ 'command': 'nbd-server-stop' }
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##
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# @BlockExportType:
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#
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# An enumeration of block export types
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#
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# @nbd: NBD export
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#
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# Since: 4.2
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##
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{ 'enum': 'BlockExportType',
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'data': [ 'nbd' ] }
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##
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# @BlockExportOptions:
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#
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# Describes a block export, i.e. how single node should be exported on an
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# external interface.
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#
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# @writethrough: If true, caches are flushed after every write request to the
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# export before completion is signalled. (since: 5.2;
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# default: false)
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#
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# Since: 4.2
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##
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{ 'union': 'BlockExportOptions',
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'base': { 'type': 'BlockExportType',
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'*writethrough': 'bool' },
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'discriminator': 'type',
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'data': {
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'nbd': 'BlockExportOptionsNbd'
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} }
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##
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# @block-export-add:
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#
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# Creates a new block export.
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#
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# Since: 5.2
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##
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{ 'command': 'block-export-add',
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'data': 'BlockExportOptions', 'boxed': true }
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