qlist: Make conversion from QObject * accept null

[qemu.git] / qapi / block.json

# -*- Mode: Python -*-
#
# QAPI block definitions (vm related)

# QAPI block core definitions
{ 'include': 'block-core.json' }

##
# @BiosAtaTranslation:
#
# Policy that BIOS should use to interpret cylinder/head/sector
# addresses.  Note that Bochs BIOS and SeaBIOS will not actually
# translate logical CHS to physical; instead, they will use logical
# block addressing.
#
# @auto: If cylinder/heads/sizes are passed, choose between none and LBA
#        depending on the size of the disk.  If they are not passed,
#        choose none if QEMU can guess that the disk had 16 or fewer
#        heads, large if QEMU can guess that the disk had 131072 or
#        fewer tracks across all heads (i.e. cylinders*heads<131072),
#        otherwise LBA.
#
# @none: The physical disk geometry is equal to the logical geometry.
#
# @lba: Assume 63 sectors per track and one of 16, 32, 64, 128 or 255
#       heads (if fewer than 255 are enough to cover the whole disk
#       with 1024 cylinders/head).  The number of cylinders/head is
#       then computed based on the number of sectors and heads.
#
# @large: The number of cylinders per head is scaled down to 1024
#         by correspondingly scaling up the number of heads.
#
# @rechs: Same as @large, but first convert a 16-head geometry to
#         15-head, by proportionally scaling up the number of
#         cylinders/head.
#
# Since: 2.0
##
{ 'enum': 'BiosAtaTranslation',
  'data': ['auto', 'none', 'lba', 'large', 'rechs']}

##
# @BlockdevSnapshotInternal
#
# @device: the name of the device to generate the snapshot from
#
# @name: the name of the internal snapshot to be created
#
# Notes: In transaction, if @name is empty, or any snapshot matching @name
#        exists, the operation will fail. Only some image formats support it,
#        for example, qcow2, rbd, and sheepdog.
#
# Since: 1.7
##
{ 'struct': 'BlockdevSnapshotInternal',
  'data': { 'device': 'str', 'name': 'str' } }

##
# @blockdev-snapshot-internal-sync
#
# Synchronously take an internal snapshot of a block device, when the format
# of the image used supports it.
#
# For the arguments, see the documentation of BlockdevSnapshotInternal.
#
# Returns: nothing on success
#          If @device is not a valid block device, DeviceNotFound
#          If any snapshot matching @name exists, or @name is empty,
#          GenericError
#          If the format of the image used does not support it,
#          BlockFormatFeatureNotSupported
#
# Since 1.7
##
{ 'command': 'blockdev-snapshot-internal-sync',
  'data': 'BlockdevSnapshotInternal' }

##
# @blockdev-snapshot-delete-internal-sync
#
# Synchronously delete an internal snapshot of a block device, when the format
# of the image used support it. The snapshot is identified by name or id or
# both. One of the name or id is required. Return SnapshotInfo for the
# successfully deleted snapshot.
#
# @device: the name of the device to delete the snapshot from
#
# @id: optional the snapshot's ID to be deleted
#
# @name: optional the snapshot's name to be deleted
#
# Returns: SnapshotInfo on success
#          If @device is not a valid block device, DeviceNotFound
#          If snapshot not found, GenericError
#          If the format of the image used does not support it,
#          BlockFormatFeatureNotSupported
#          If @id and @name are both not specified, GenericError
#
# Since 1.7
##
{ 'command': 'blockdev-snapshot-delete-internal-sync',
  'data': { 'device': 'str', '*id': 'str', '*name': 'str'},
  'returns': 'SnapshotInfo' }

##
# @eject:
#
# Ejects a device from a removable drive.
#
# @device:  The name of the device
#
# @force:   @optional If true, eject regardless of whether the drive is locked.
#           If not specified, the default value is false.
#
# Returns:  Nothing on success
#           If @device is not a valid block device, DeviceNotFound
#
# Notes:    Ejecting a device will no media results in success
#
# Since: 0.14.0
##
{ 'command': 'eject', 'data': {'device': 'str', '*force': 'bool'} }

##
# @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".
#
# @addr: Address on which to listen.
#
# Returns: error if the server is already running.
#
# Since: 1.3.0
##
{ 'command': 'nbd-server-start',
  'data': { 'addr': 'SocketAddress' } }

##
# @nbd-server-add:
#
# Export a device to QEMU's embedded NBD server.
#
# @device: Block device to be exported
#
# @writable: Whether clients should be able to write to the device via the
#     NBD connection (default false). #optional
#
# Returns: error if the device is already marked for export.
#
# Since: 1.3.0
##
{ 'command': 'nbd-server-add', 'data': {'device': 'str', '*writable': 'bool'} }

##
# @nbd-server-stop:
#
# Stop QEMU's embedded NBD server, and unregister all devices previously
# added via @nbd-server-add.
#
# Since: 1.3.0
##
{ 'command': 'nbd-server-stop' }

##
# @DEVICE_TRAY_MOVED
#
# Emitted whenever the tray of a removable device is moved by the guest or by
# HMP/QMP commands
#
# @device: device name
#
# @tray-open: true if the tray has been opened or false if it has been closed
#
# Since: 1.1
##
{ 'event': 'DEVICE_TRAY_MOVED',
  'data': { 'device': 'str', 'tray-open': 'bool' } }