xref: /qemu/qapi/block-core.json (revision ac90871c)

# -*- Mode: Python -*-

##
# == Block core (VM unrelated)
##

{ 'include': 'common.json' }
{ 'include': 'crypto.json' }
{ 'include': 'job.json' }
{ 'include': 'sockets.json' }

##
# @SnapshotInfo:
#
# @id: unique snapshot id
#
# @name: user chosen name
#
# @vm-state-size: size of the VM state
#
# @date-sec: UTC date of the snapshot in seconds
#
# @date-nsec: fractional part in nano seconds to be used with date-sec
#
# @vm-clock-sec: VM clock relative to boot in seconds
#
# @vm-clock-nsec: fractional part in nano seconds to be used with vm-clock-sec
#
# Since: 1.3
#
##
{ 'struct': 'SnapshotInfo',
  'data': { 'id': 'str', 'name': 'str', 'vm-state-size': 'int',
            'date-sec': 'int', 'date-nsec': 'int',
            'vm-clock-sec': 'int', 'vm-clock-nsec': 'int' } }

##
# @ImageInfoSpecificQCow2EncryptionBase:
#
# @format: The encryption format
#
# Since: 2.10
##
{ 'struct': 'ImageInfoSpecificQCow2EncryptionBase',
  'data': { 'format': 'BlockdevQcow2EncryptionFormat'}}

##
# @ImageInfoSpecificQCow2Encryption:
#
# Since: 2.10
##
{ 'union': 'ImageInfoSpecificQCow2Encryption',
  'base': 'ImageInfoSpecificQCow2EncryptionBase',
  'discriminator': 'format',
  'data': { 'luks': 'QCryptoBlockInfoLUKS' } }

##
# @ImageInfoSpecificQCow2:
#
# @compat: compatibility level
#
# @data-file: the filename of the external data file that is stored in the
#             image and used as a default for opening the image (since: 4.0)
#
# @data-file-raw: True if the external data file must stay valid as a
#                 standalone (read-only) raw image without looking at qcow2
#                 metadata (since: 4.0)
#
# @lazy-refcounts: on or off; only valid for compat >= 1.1
#
# @corrupt: true if the image has been marked corrupt; only valid for
#           compat >= 1.1 (since 2.2)
#
# @refcount-bits: width of a refcount entry in bits (since 2.3)
#
# @encrypt: details about encryption parameters; only set if image
#           is encrypted (since 2.10)
#
# @bitmaps: A list of qcow2 bitmap details (since 4.0)
#
# Since: 1.7
##
{ 'struct': 'ImageInfoSpecificQCow2',
  'data': {
      'compat': 'str',
      '*data-file': 'str',
      '*data-file-raw': 'bool',
      '*lazy-refcounts': 'bool',
      '*corrupt': 'bool',
      'refcount-bits': 'int',
      '*encrypt': 'ImageInfoSpecificQCow2Encryption',
      '*bitmaps': ['Qcow2BitmapInfo']
  } }

##
# @ImageInfoSpecificVmdk:
#
# @create-type: The create type of VMDK image
#
# @cid: Content id of image
#
# @parent-cid: Parent VMDK image's cid
#
# @extents: List of extent files
#
# Since: 1.7
##
{ 'struct': 'ImageInfoSpecificVmdk',
  'data': {
      'create-type': 'str',
      'cid': 'int',
      'parent-cid': 'int',
      'extents': ['ImageInfo']
  } }

##
# @ImageInfoSpecific:
#
# A discriminated record of image format specific information structures.
#
# Since: 1.7
##
{ 'union': 'ImageInfoSpecific',
  'data': {
      'qcow2': 'ImageInfoSpecificQCow2',
      'vmdk': 'ImageInfoSpecificVmdk',
      # If we need to add block driver specific parameters for
      # LUKS in future, then we'll subclass QCryptoBlockInfoLUKS
      # to define a ImageInfoSpecificLUKS
      'luks': 'QCryptoBlockInfoLUKS'
  } }

##
# @ImageInfo:
#
# Information about a QEMU image file
#
# @filename: name of the image file
#
# @format: format of the image file
#
# @virtual-size: maximum capacity in bytes of the image
#
# @actual-size: actual size on disk in bytes of the image
#
# @dirty-flag: true if image is not cleanly closed
#
# @cluster-size: size of a cluster in bytes
#
# @encrypted: true if the image is encrypted
#
# @compressed: true if the image is compressed (Since 1.7)
#
# @backing-filename: name of the backing file
#
# @full-backing-filename: full path of the backing file
#
# @backing-filename-format: the format of the backing file
#
# @snapshots: list of VM snapshots
#
# @backing-image: info of the backing image (since 1.6)
#
# @format-specific: structure supplying additional format-specific
#                   information (since 1.7)
#
# Since: 1.3
#
##
{ 'struct': 'ImageInfo',
  'data': {'filename': 'str', 'format': 'str', '*dirty-flag': 'bool',
           '*actual-size': 'int', 'virtual-size': 'int',
           '*cluster-size': 'int', '*encrypted': 'bool', '*compressed': 'bool',
           '*backing-filename': 'str', '*full-backing-filename': 'str',
           '*backing-filename-format': 'str', '*snapshots': ['SnapshotInfo'],
           '*backing-image': 'ImageInfo',
           '*format-specific': 'ImageInfoSpecific' } }

##
# @ImageCheck:
#
# Information about a QEMU image file check
#
# @filename: name of the image file checked
#
# @format: format of the image file checked
#
# @check-errors: number of unexpected errors occurred during check
#
# @image-end-offset: offset (in bytes) where the image ends, this
#                    field is present if the driver for the image format
#                    supports it
#
# @corruptions: number of corruptions found during the check if any
#
# @leaks: number of leaks found during the check if any
#
# @corruptions-fixed: number of corruptions fixed during the check
#                     if any
#
# @leaks-fixed: number of leaks fixed during the check if any
#
# @total-clusters: total number of clusters, this field is present
#                  if the driver for the image format supports it
#
# @allocated-clusters: total number of allocated clusters, this
#                      field is present if the driver for the image format
#                      supports it
#
# @fragmented-clusters: total number of fragmented clusters, this
#                       field is present if the driver for the image format
#                       supports it
#
# @compressed-clusters: total number of compressed clusters, this
#                       field is present if the driver for the image format
#                       supports it
#
# Since: 1.4
#
##
{ 'struct': 'ImageCheck',
  'data': {'filename': 'str', 'format': 'str', 'check-errors': 'int',
           '*image-end-offset': 'int', '*corruptions': 'int', '*leaks': 'int',
           '*corruptions-fixed': 'int', '*leaks-fixed': 'int',
           '*total-clusters': 'int', '*allocated-clusters': 'int',
           '*fragmented-clusters': 'int', '*compressed-clusters': 'int' } }

##
# @MapEntry:
#
# Mapping information from a virtual block range to a host file range
#
# @start: the start byte of the mapped virtual range
#
# @length: the number of bytes of the mapped virtual range
#
# @data: whether the mapped range has data
#
# @zero: whether the virtual blocks are zeroed
#
# @depth: the depth of the mapping
#
# @offset: the offset in file that the virtual sectors are mapped to
#
# @filename: filename that is referred to by @offset
#
# Since: 2.6
#
##
{ 'struct': 'MapEntry',
  'data': {'start': 'int', 'length': 'int', 'data': 'bool',
           'zero': 'bool', 'depth': 'int', '*offset': 'int',
           '*filename': 'str' } }

##
# @BlockdevCacheInfo:
#
# Cache mode information for a block device
#
# @writeback:   true if writeback mode is enabled
# @direct:      true if the host page cache is bypassed (O_DIRECT)
# @no-flush:    true if flush requests are ignored for the device
#
# Since: 2.3
##
{ 'struct': 'BlockdevCacheInfo',
  'data': { 'writeback': 'bool',
            'direct': 'bool',
            'no-flush': 'bool' } }

##
# @BlockDeviceInfo:
#
# Information about the backing device for a block device.
#
# @file: the filename of the backing device
#
# @node-name: the name of the block driver node (Since 2.0)
#
# @ro: true if the backing device was open read-only
#
# @drv: the name of the block format used to open the backing device. As of
#       0.14.0 this can be: 'blkdebug', 'bochs', 'cloop', 'cow', 'dmg',
#       'file', 'file', 'ftp', 'ftps', 'host_cdrom', 'host_device',
#       'http', 'https', 'luks', 'nbd', 'parallels', 'qcow',
#       'qcow2', 'raw', 'vdi', 'vmdk', 'vpc', 'vvfat'
#       2.2: 'archipelago' added, 'cow' dropped
#       2.3: 'host_floppy' deprecated
#       2.5: 'host_floppy' dropped
#       2.6: 'luks' added
#       2.8: 'replication' added, 'tftp' dropped
#       2.9: 'archipelago' dropped
#
# @backing_file: the name of the backing file (for copy-on-write)
#
# @backing_file_depth: number of files in the backing file chain (since: 1.2)
#
# @encrypted: true if the backing device is encrypted
#
# @encryption_key_missing: Deprecated; always false
#
# @detect_zeroes: detect and optimize zero writes (Since 2.1)
#
# @bps: total throughput limit in bytes per second is specified
#
# @bps_rd: read throughput limit in bytes per second is specified
#
# @bps_wr: write throughput limit in bytes per second is specified
#
# @iops: total I/O operations per second is specified
#
# @iops_rd: read I/O operations per second is specified
#
# @iops_wr: write I/O operations per second is specified
#
# @image: the info of image used (since: 1.6)
#
# @bps_max: total throughput limit during bursts,
#                     in bytes (Since 1.7)
#
# @bps_rd_max: read throughput limit during bursts,
#                        in bytes (Since 1.7)
#
# @bps_wr_max: write throughput limit during bursts,
#                        in bytes (Since 1.7)
#
# @iops_max: total I/O operations per second during bursts,
#                      in bytes (Since 1.7)
#
# @iops_rd_max: read I/O operations per second during bursts,
#                         in bytes (Since 1.7)
#
# @iops_wr_max: write I/O operations per second during bursts,
#                         in bytes (Since 1.7)
#
# @bps_max_length: maximum length of the @bps_max burst
#                            period, in seconds. (Since 2.6)
#
# @bps_rd_max_length: maximum length of the @bps_rd_max
#                               burst period, in seconds. (Since 2.6)
#
# @bps_wr_max_length: maximum length of the @bps_wr_max
#                               burst period, in seconds. (Since 2.6)
#
# @iops_max_length: maximum length of the @iops burst
#                             period, in seconds. (Since 2.6)
#
# @iops_rd_max_length: maximum length of the @iops_rd_max
#                                burst period, in seconds. (Since 2.6)
#
# @iops_wr_max_length: maximum length of the @iops_wr_max
#                                burst period, in seconds. (Since 2.6)
#
# @iops_size: an I/O size in bytes (Since 1.7)
#
# @group: throttle group name (Since 2.4)
#
# @cache: the cache mode used for the block device (since: 2.3)
#
# @write_threshold: configured write threshold for the device.
#                   0 if disabled. (Since 2.3)
#
# @dirty-bitmaps: dirty bitmaps information (only present if node
#                 has one or more dirty bitmaps) (Since 4.2)
#
# Since: 0.14.0
#
##
{ 'struct': 'BlockDeviceInfo',
  'data': { 'file': 'str', '*node-name': 'str', 'ro': 'bool', 'drv': 'str',
            '*backing_file': 'str', 'backing_file_depth': 'int',
            'encrypted': 'bool', 'encryption_key_missing': 'bool',
            'detect_zeroes': 'BlockdevDetectZeroesOptions',
            'bps': 'int', 'bps_rd': 'int', 'bps_wr': 'int',
            'iops': 'int', 'iops_rd': 'int', 'iops_wr': 'int',
            'image': 'ImageInfo',
            '*bps_max': 'int', '*bps_rd_max': 'int',
            '*bps_wr_max': 'int', '*iops_max': 'int',
            '*iops_rd_max': 'int', '*iops_wr_max': 'int',
            '*bps_max_length': 'int', '*bps_rd_max_length': 'int',
            '*bps_wr_max_length': 'int', '*iops_max_length': 'int',
            '*iops_rd_max_length': 'int', '*iops_wr_max_length': 'int',
            '*iops_size': 'int', '*group': 'str', 'cache': 'BlockdevCacheInfo',
            'write_threshold': 'int', '*dirty-bitmaps': ['BlockDirtyInfo'] } }

##
# @BlockDeviceIoStatus:
#
# An enumeration of block device I/O status.
#
# @ok: The last I/O operation has succeeded
#
# @failed: The last I/O operation has failed
#
# @nospace: The last I/O operation has failed due to a no-space condition
#
# Since: 1.0
##
{ 'enum': 'BlockDeviceIoStatus', 'data': [ 'ok', 'failed', 'nospace' ] }

##
# @BlockDeviceMapEntry:
#
# Entry in the metadata map of the device (returned by "qemu-img map")
#
# @start: Offset in the image of the first byte described by this entry
#         (in bytes)
#
# @length: Length of the range described by this entry (in bytes)
#
# @depth: Number of layers (0 = top image, 1 = top image's backing file, etc.)
#         before reaching one for which the range is allocated.  The value is
#         in the range 0 to the depth of the image chain - 1.
#
# @zero: the sectors in this range read as zeros
#
# @data: reading the image will actually read data from a file (in particular,
#        if @offset is present this means that the sectors are not simply
#        preallocated, but contain actual data in raw format)
#
# @offset: if present, the image file stores the data for this range in
#          raw format at the given offset.
#
# Since: 1.7
##
{ 'struct': 'BlockDeviceMapEntry',
  'data': { 'start': 'int', 'length': 'int', 'depth': 'int', 'zero': 'bool',
            'data': 'bool', '*offset': 'int' } }

##
# @DirtyBitmapStatus:
#
# An enumeration of possible states that a dirty bitmap can report to the user.
#
# @frozen: The bitmap is currently in-use by some operation and is immutable.
#          If the bitmap was @active prior to the operation, new writes by the
#          guest are being recorded in a temporary buffer, and will not be lost.
#          Generally, bitmaps are cleared on successful use in an operation and
#          the temporary buffer is committed into the bitmap. On failure, the
#          temporary buffer is merged back into the bitmap without first
#          clearing it.
#          Please refer to the documentation for each bitmap-using operation,
#          See also @blockdev-backup, @drive-backup.
#
# @disabled: The bitmap is not currently recording new writes by the guest.
#            This is requested explicitly via @block-dirty-bitmap-disable.
#            It can still be cleared, deleted, or used for backup operations.
#
# @active: The bitmap is actively monitoring for new writes, and can be cleared,
#          deleted, or used for backup operations.
#
# @locked: The bitmap is currently in-use by some operation and is immutable.
#          If the bitmap was @active prior to the operation, it is still
#          recording new writes. If the bitmap was @disabled, it is not
#          recording new writes. (Since 2.12)
#
# @inconsistent: This is a persistent dirty bitmap that was marked in-use on
#                disk, and is unusable by QEMU. It can only be deleted.
#                Please rely on the inconsistent field in @BlockDirtyInfo
#                instead, as the status field is deprecated. (Since 4.0)
#
# Since: 2.4
##
{ 'enum': 'DirtyBitmapStatus',
  'data': ['active', 'disabled', 'frozen', 'locked', 'inconsistent'] }

##
# @BlockDirtyInfo:
#
# Block dirty bitmap information.
#
# @name: the name of the dirty bitmap (Since 2.4)
#
# @count: number of dirty bytes according to the dirty bitmap
#
# @granularity: granularity of the dirty bitmap in bytes (since 1.4)
#
# @status: Deprecated in favor of @recording and @locked. (since 2.4)
#
# @recording: true if the bitmap is recording new writes from the guest.
#             Replaces `active` and `disabled` statuses. (since 4.0)
#
# @busy: true if the bitmap is in-use by some operation (NBD or jobs)
#        and cannot be modified via QMP or used by another operation.
#        Replaces `locked` and `frozen` statuses. (since 4.0)
#
# @persistent: true if the bitmap was stored on disk, is scheduled to be stored
#              on disk, or both. (since 4.0)
#
# @inconsistent: true if this is a persistent bitmap that was improperly
#                stored. Implies @persistent to be true; @recording and
#                @busy to be false. This bitmap cannot be used. To remove
#                it, use @block-dirty-bitmap-remove. (Since 4.0)
#
# Since: 1.3
##
{ 'struct': 'BlockDirtyInfo',
  'data': {'*name': 'str', 'count': 'int', 'granularity': 'uint32',
           'recording': 'bool', 'busy': 'bool', 'status': 'DirtyBitmapStatus',
           'persistent': 'bool', '*inconsistent': 'bool' } }

##
# @Qcow2BitmapInfoFlags:
#
# An enumeration of flags that a bitmap can report to the user.
#
# @in-use: This flag is set by any process actively modifying the qcow2 file,
#          and cleared when the updated bitmap is flushed to the qcow2 image.
#          The presence of this flag in an offline image means that the bitmap
#          was not saved correctly after its last usage, and may contain
#          inconsistent data.
#
# @auto: The bitmap must reflect all changes of the virtual disk by any
#        application that would write to this qcow2 file.
#
# Since: 4.0
##
{ 'enum': 'Qcow2BitmapInfoFlags',
  'data': ['in-use', 'auto'] }

##
# @Qcow2BitmapInfo:
#
# Qcow2 bitmap information.
#
# @name: the name of the bitmap
#
# @granularity: granularity of the bitmap in bytes
#
# @flags: flags of the bitmap
#
# Since: 4.0
##
{ 'struct': 'Qcow2BitmapInfo',
  'data': {'name': 'str', 'granularity': 'uint32',
           'flags': ['Qcow2BitmapInfoFlags'] } }

##
# @BlockLatencyHistogramInfo:
#
# Block latency histogram.
#
# @boundaries: list of interval boundary values in nanoseconds, all greater
#              than zero and in ascending order.
#              For example, the list [10, 50, 100] produces the following
#              histogram intervals: [0, 10), [10, 50), [50, 100), [100, +inf).
#
# @bins: list of io request counts corresponding to histogram intervals.
#        len(@bins) = len(@boundaries) + 1
#        For the example above, @bins may be something like [3, 1, 5, 2],
#        and corresponding histogram looks like:
#
# |      5|           *
# |      4|           *
# |      3| *         *
# |      2| *         *    *
# |      1| *    *    *    *
# |       +------------------
# |           10   50   100
#
# Since: 4.0
##
{ 'struct': 'BlockLatencyHistogramInfo',
  'data': {'boundaries': ['uint64'], 'bins': ['uint64'] } }

##
# @BlockInfo:
#
# Block device information.  This structure describes a virtual device and
# the backing device associated with it.
#
# @device: The device name associated with the virtual device.
#
# @qdev: The qdev ID, or if no ID is assigned, the QOM path of the block
#        device. (since 2.10)
#
# @type: This field is returned only for compatibility reasons, it should
#        not be used (always returns 'unknown')
#
# @removable: True if the device supports removable media.
#
# @locked: True if the guest has locked this device from having its media
#          removed
#
# @tray_open: True if the device's tray is open
#             (only present if it has a tray)
#
# @dirty-bitmaps: dirty bitmaps information (only present if the
#                 driver has one or more dirty bitmaps) (Since 2.0)
#                 Deprecated in 4.2; see BlockDeviceInfo instead.
#
# @io-status: @BlockDeviceIoStatus. Only present if the device
#             supports it and the VM is configured to stop on errors
#             (supported device models: virtio-blk, IDE, SCSI except
#             scsi-generic)
#
# @inserted: @BlockDeviceInfo describing the device if media is
#            present
#
# Since:  0.14.0
##
{ 'struct': 'BlockInfo',
  'data': {'device': 'str', '*qdev': 'str', 'type': 'str', 'removable': 'bool',
           'locked': 'bool', '*inserted': 'BlockDeviceInfo',
           '*tray_open': 'bool', '*io-status': 'BlockDeviceIoStatus',
           '*dirty-bitmaps': ['BlockDirtyInfo'] } }

##
# @BlockMeasureInfo:
#
# Image file size calculation information.  This structure describes the size
# requirements for creating a new image file.
#
# The size requirements depend on the new image file format.  File size always
# equals virtual disk size for the 'raw' format, even for sparse POSIX files.
# Compact formats such as 'qcow2' represent unallocated and zero regions
# efficiently so file size may be smaller than virtual disk size.
#
# The values are upper bounds that are guaranteed to fit the new image file.
# Subsequent modification, such as internal snapshot or bitmap creation, may
# require additional space and is not covered here.
#
# @required: Size required for a new image file, in bytes.
#
# @fully-allocated: Image file size, in bytes, once data has been written
#                   to all sectors.
#
# Since: 2.10
##
{ 'struct': 'BlockMeasureInfo',
  'data': {'required': 'int', 'fully-allocated': 'int'} }

##
# @query-block:
#
# Get a list of BlockInfo for all virtual block devices.
#
# Returns: a list of @BlockInfo describing each virtual block device. Filter
#          nodes that were created implicitly are skipped over.
#
# Since: 0.14.0
#
# Example:
#
# -> { "execute": "query-block" }
# <- {
#       "return":[
#          {
#             "io-status": "ok",
#             "device":"ide0-hd0",
#             "locked":false,
#             "removable":false,
#             "inserted":{
#                "ro":false,
#                "drv":"qcow2",
#                "encrypted":false,
#                "file":"disks/test.qcow2",
#                "backing_file_depth":1,
#                "bps":1000000,
#                "bps_rd":0,
#                "bps_wr":0,
#                "iops":1000000,
#                "iops_rd":0,
#                "iops_wr":0,
#                "bps_max": 8000000,
#                "bps_rd_max": 0,
#                "bps_wr_max": 0,
#                "iops_max": 0,
#                "iops_rd_max": 0,
#                "iops_wr_max": 0,
#                "iops_size": 0,
#                "detect_zeroes": "on",
#                "write_threshold": 0,
#                "image":{
#                   "filename":"disks/test.qcow2",
#                   "format":"qcow2",
#                   "virtual-size":2048000,
#                   "backing_file":"base.qcow2",
#                   "full-backing-filename":"disks/base.qcow2",
#                   "backing-filename-format":"qcow2",
#                   "snapshots":[
#                      {
#                         "id": "1",
#                         "name": "snapshot1",
#                         "vm-state-size": 0,
#                         "date-sec": 10000200,
#                         "date-nsec": 12,
#                         "vm-clock-sec": 206,
#                         "vm-clock-nsec": 30
#                      }
#                   ],
#                   "backing-image":{
#                       "filename":"disks/base.qcow2",
#                       "format":"qcow2",
#                       "virtual-size":2048000
#                   }
#                }
#             },
#             "qdev": "ide_disk",
#             "type":"unknown"
#          },
#          {
#             "io-status": "ok",
#             "device":"ide1-cd0",
#             "locked":false,
#             "removable":true,
#             "qdev": "/machine/unattached/device[23]",
#             "tray_open": false,
#             "type":"unknown"
#          },
#          {
#             "device":"floppy0",
#             "locked":false,
#             "removable":true,
#             "qdev": "/machine/unattached/device[20]",
#             "type":"unknown"
#          },
#          {
#             "device":"sd0",
#             "locked":false,
#             "removable":true,
#             "type":"unknown"
#          }
#       ]
#    }
#
##
{ 'command': 'query-block', 'returns': ['BlockInfo'] }


##
# @BlockDeviceTimedStats:
#
# Statistics of a block device during a given interval of time.
#
# @interval_length: Interval used for calculating the statistics,
#                   in seconds.
#
# @min_rd_latency_ns: Minimum latency of read operations in the
#                     defined interval, in nanoseconds.
#
# @min_wr_latency_ns: Minimum latency of write operations in the
#                     defined interval, in nanoseconds.
#
# @min_flush_latency_ns: Minimum latency of flush operations in the
#                        defined interval, in nanoseconds.
#
# @max_rd_latency_ns: Maximum latency of read operations in the
#                     defined interval, in nanoseconds.
#
# @max_wr_latency_ns: Maximum latency of write operations in the
#                     defined interval, in nanoseconds.
#
# @max_flush_latency_ns: Maximum latency of flush operations in the
#                        defined interval, in nanoseconds.
#
# @avg_rd_latency_ns: Average latency of read operations in the
#                     defined interval, in nanoseconds.
#
# @avg_wr_latency_ns: Average latency of write operations in the
#                     defined interval, in nanoseconds.
#
# @avg_flush_latency_ns: Average latency of flush operations in the
#                        defined interval, in nanoseconds.
#
# @avg_rd_queue_depth: Average number of pending read operations
#                      in the defined interval.
#
# @avg_wr_queue_depth: Average number of pending write operations
#                      in the defined interval.
#
# Since: 2.5
##
{ 'struct': 'BlockDeviceTimedStats',
  'data': { 'interval_length': 'int', 'min_rd_latency_ns': 'int',
            'max_rd_latency_ns': 'int', 'avg_rd_latency_ns': 'int',
            'min_wr_latency_ns': 'int', 'max_wr_latency_ns': 'int',
            'avg_wr_latency_ns': 'int', 'min_flush_latency_ns': 'int',
            'max_flush_latency_ns': 'int', 'avg_flush_latency_ns': 'int',
            'avg_rd_queue_depth': 'number', 'avg_wr_queue_depth': 'number' } }

##
# @BlockDeviceStats:
#
# Statistics of a virtual block device or a block backing device.
#
# @rd_bytes:      The number of bytes read by the device.
#
# @wr_bytes:      The number of bytes written by the device.
#
# @unmap_bytes: The number of bytes unmapped by the device (Since 4.2)
#
# @rd_operations: The number of read operations performed by the device.
#
# @wr_operations: The number of write operations performed by the device.
#
# @flush_operations: The number of cache flush operations performed by the
#                    device (since 0.15.0)
#
# @unmap_operations: The number of unmap operations performed by the device
#                    (Since 4.2)
#
# @rd_total_time_ns: Total time spent on reads in nanoseconds (since 0.15.0).
#
# @wr_total_time_ns: Total time spent on writes in nanoseconds (since 0.15.0).
#
# @flush_total_time_ns: Total time spent on cache flushes in nanoseconds
#                       (since 0.15.0).
#
# @unmap_total_time_ns: Total time spent on unmap operations in nanoseconds
#                       (Since 4.2)
#
# @wr_highest_offset: The offset after the greatest byte written to the
#                     device.  The intended use of this information is for
#                     growable sparse files (like qcow2) that are used on top
#                     of a physical device.
#
# @rd_merged: Number of read requests that have been merged into another
#             request (Since 2.3).
#
# @wr_merged: Number of write requests that have been merged into another
#             request (Since 2.3).
#
# @unmap_merged: Number of unmap requests that have been merged into another
#                request (Since 4.2)
#
# @idle_time_ns: Time since the last I/O operation, in
#                nanoseconds. If the field is absent it means that
#                there haven't been any operations yet (Since 2.5).
#
# @failed_rd_operations: The number of failed read operations
#                        performed by the device (Since 2.5)
#
# @failed_wr_operations: The number of failed write operations
#                        performed by the device (Since 2.5)
#
# @failed_flush_operations: The number of failed flush operations
#                           performed by the device (Since 2.5)
#
# @failed_unmap_operations: The number of failed unmap operations performed
#                           by the device (Since 4.2)
#
# @invalid_rd_operations: The number of invalid read operations
#                          performed by the device (Since 2.5)
#
# @invalid_wr_operations: The number of invalid write operations
#                         performed by the device (Since 2.5)
#
# @invalid_flush_operations: The number of invalid flush operations
#                            performed by the device (Since 2.5)
#
# @invalid_unmap_operations: The number of invalid unmap operations performed
#                            by the device (Since 4.2)
#
# @account_invalid: Whether invalid operations are included in the
#                   last access statistics (Since 2.5)
#
# @account_failed: Whether failed operations are included in the
#                  latency and last access statistics (Since 2.5)
#
# @timed_stats: Statistics specific to the set of previously defined
#               intervals of time (Since 2.5)
#
# @rd_latency_histogram: @BlockLatencyHistogramInfo. (Since 4.0)
#
# @wr_latency_histogram: @BlockLatencyHistogramInfo. (Since 4.0)
#
# @flush_latency_histogram: @BlockLatencyHistogramInfo. (Since 4.0)
#
# Since: 0.14.0
##
{ 'struct': 'BlockDeviceStats',
  'data': {'rd_bytes': 'int', 'wr_bytes': 'int', 'unmap_bytes' : 'int',
           'rd_operations': 'int', 'wr_operations': 'int',
           'flush_operations': 'int', 'unmap_operations': 'int',
           'rd_total_time_ns': 'int', 'wr_total_time_ns': 'int',
           'flush_total_time_ns': 'int', 'unmap_total_time_ns': 'int',
           'wr_highest_offset': 'int',
           'rd_merged': 'int', 'wr_merged': 'int', 'unmap_merged': 'int',
           '*idle_time_ns': 'int',
           'failed_rd_operations': 'int', 'failed_wr_operations': 'int',
           'failed_flush_operations': 'int', 'failed_unmap_operations': 'int',
           'invalid_rd_operations': 'int', 'invalid_wr_operations': 'int',
           'invalid_flush_operations': 'int', 'invalid_unmap_operations': 'int',
           'account_invalid': 'bool', 'account_failed': 'bool',
           'timed_stats': ['BlockDeviceTimedStats'],
           '*rd_latency_histogram': 'BlockLatencyHistogramInfo',
           '*wr_latency_histogram': 'BlockLatencyHistogramInfo',
           '*flush_latency_histogram': 'BlockLatencyHistogramInfo' } }

##
# @BlockStatsSpecificFile:
#
# File driver statistics
#
# @discard-nb-ok: The number of successful discard operations performed by
#                 the driver.
#
# @discard-nb-failed: The number of failed discard operations performed by
#                     the driver.
#
# @discard-bytes-ok: The number of bytes discarded by the driver.
#
# Since: 4.2
##
{ 'struct': 'BlockStatsSpecificFile',
  'data': {
      'discard-nb-ok': 'uint64',
      'discard-nb-failed': 'uint64',
      'discard-bytes-ok': 'uint64' } }

##
# @BlockStatsSpecific:
#
# Block driver specific statistics
#
# Since: 4.2
##
{ 'union': 'BlockStatsSpecific',
  'base': { 'driver': 'BlockdevDriver' },
  'discriminator': 'driver',
  'data': {
      'file': 'BlockStatsSpecificFile',
      'host_device': 'BlockStatsSpecificFile' } }

##
# @BlockStats:
#
# Statistics of a virtual block device or a block backing device.
#
# @device: If the stats are for a virtual block device, the name
#          corresponding to the virtual block device.
#
# @node-name: The node name of the device. (Since 2.3)
#
# @qdev: The qdev ID, or if no ID is assigned, the QOM path of the block
#        device. (since 3.0)
#
# @stats:  A @BlockDeviceStats for the device.
#
# @driver-specific: Optional driver-specific stats. (Since 4.2)
#
# @parent: This describes the file block device if it has one.
#          Contains recursively the statistics of the underlying
#          protocol (e.g. the host file for a qcow2 image). If there is
#          no underlying protocol, this field is omitted
#
# @backing: This describes the backing block device if it has one.
#           (Since 2.0)
#
# Since: 0.14.0
##
{ 'struct': 'BlockStats',
  'data': {'*device': 'str', '*qdev': 'str', '*node-name': 'str',
           'stats': 'BlockDeviceStats',
           '*driver-specific': 'BlockStatsSpecific',
           '*parent': 'BlockStats',
           '*backing': 'BlockStats'} }

##
# @query-blockstats:
#
# Query the @BlockStats for all virtual block devices.
#
# @query-nodes: If true, the command will query all the block nodes
#               that have a node name, in a list which will include "parent"
#               information, but not "backing".
#               If false or omitted, the behavior is as before - query all the
#               device backends, recursively including their "parent" and
#               "backing". Filter nodes that were created implicitly are
#               skipped over in this mode. (Since 2.3)
#
# Returns: A list of @BlockStats for each virtual block devices.
#
# Since: 0.14.0
#
# Example:
#
# -> { "execute": "query-blockstats" }
# <- {
#       "return":[
#          {
#             "device":"ide0-hd0",
#             "parent":{
#                "stats":{
#                   "wr_highest_offset":3686448128,
#                   "wr_bytes":9786368,
#                   "wr_operations":751,
#                   "rd_bytes":122567168,
#                   "rd_operations":36772
#                   "wr_total_times_ns":313253456
#                   "rd_total_times_ns":3465673657
#                   "flush_total_times_ns":49653
#                   "flush_operations":61,
#                   "rd_merged":0,
#                   "wr_merged":0,
#                   "idle_time_ns":2953431879,
#                   "account_invalid":true,
#                   "account_failed":false
#                }
#             },
#             "stats":{
#                "wr_highest_offset":2821110784,
#                "wr_bytes":9786368,
#                "wr_operations":692,
#                "rd_bytes":122739200,
#                "rd_operations":36604
#                "flush_operations":51,
#                "wr_total_times_ns":313253456
#                "rd_total_times_ns":3465673657
#                "flush_total_times_ns":49653,
#                "rd_merged":0,
#                "wr_merged":0,
#                "idle_time_ns":2953431879,
#                "account_invalid":true,
#                "account_failed":false
#             },
#             "qdev": "/machine/unattached/device[23]"
#          },
#          {
#             "device":"ide1-cd0",
#             "stats":{
#                "wr_highest_offset":0,
#                "wr_bytes":0,
#                "wr_operations":0,
#                "rd_bytes":0,
#                "rd_operations":0
#                "flush_operations":0,
#                "wr_total_times_ns":0
#                "rd_total_times_ns":0
#                "flush_total_times_ns":0,
#                "rd_merged":0,
#                "wr_merged":0,
#                "account_invalid":false,
#                "account_failed":false
#             },
#             "qdev": "/machine/unattached/device[24]"
#          },
#          {
#             "device":"floppy0",
#             "stats":{
#                "wr_highest_offset":0,
#                "wr_bytes":0,
#                "wr_operations":0,
#                "rd_bytes":0,
#                "rd_operations":0
#                "flush_operations":0,
#                "wr_total_times_ns":0
#                "rd_total_times_ns":0
#                "flush_total_times_ns":0,
#                "rd_merged":0,
#                "wr_merged":0,
#                "account_invalid":false,
#                "account_failed":false
#             },
#             "qdev": "/machine/unattached/device[16]"
#          },
#          {
#             "device":"sd0",
#             "stats":{
#                "wr_highest_offset":0,
#                "wr_bytes":0,
#                "wr_operations":0,
#                "rd_bytes":0,
#                "rd_operations":0
#                "flush_operations":0,
#                "wr_total_times_ns":0
#                "rd_total_times_ns":0
#                "flush_total_times_ns":0,
#                "rd_merged":0,
#                "wr_merged":0,
#                "account_invalid":false,
#                "account_failed":false
#             }
#          }
#       ]
#    }
#
##
{ 'command': 'query-blockstats',
  'data': { '*query-nodes': 'bool' },
  'returns': ['BlockStats'] }

##
# @BlockdevOnError:
#
# An enumeration of possible behaviors for errors on I/O operations.
# The exact meaning depends on whether the I/O was initiated by a guest
# or by a block job
#
# @report: for guest operations, report the error to the guest;
#          for jobs, cancel the job
#
# @ignore: ignore the error, only report a QMP event (BLOCK_IO_ERROR
#          or BLOCK_JOB_ERROR). The backup, mirror and commit block jobs retry
#          the failing request later and may still complete successfully. The
#          stream block job continues to stream and will complete with an
#          error.
#
# @enospc: same as @stop on ENOSPC, same as @report otherwise.
#
# @stop: for guest operations, stop the virtual machine;
#        for jobs, pause the job
#
# @auto: inherit the error handling policy of the backend (since: 2.7)
#
# Since: 1.3
##
{ 'enum': 'BlockdevOnError',
  'data': ['report', 'ignore', 'enospc', 'stop', 'auto'] }

##
# @MirrorSyncMode:
#
# An enumeration of possible behaviors for the initial synchronization
# phase of storage mirroring.
#
# @top: copies data in the topmost image to the destination
#
# @full: copies data from all images to the destination
#
# @none: only copy data written from now on
#
# @incremental: only copy data described by the dirty bitmap. (since: 2.4)
#
# @bitmap: only copy data described by the dirty bitmap. (since: 4.2)
#          Behavior on completion is determined by the BitmapSyncMode.
#
# Since: 1.3
##
{ 'enum': 'MirrorSyncMode',
  'data': ['top', 'full', 'none', 'incremental', 'bitmap'] }

##
# @BitmapSyncMode:
#
# An enumeration of possible behaviors for the synchronization of a bitmap
# when used for data copy operations.
#
# @on-success: The bitmap is only synced when the operation is successful.
#              This is the behavior always used for 'INCREMENTAL' backups.
#
# @never: The bitmap is never synchronized with the operation, and is
#         treated solely as a read-only manifest of blocks to copy.
#
# @always: The bitmap is always synchronized with the operation,
#          regardless of whether or not the operation was successful.
#
# Since: 4.2
##
{ 'enum': 'BitmapSyncMode',
  'data': ['on-success', 'never', 'always'] }

##
# @MirrorCopyMode:
#
# An enumeration whose values tell the mirror block job when to
# trigger writes to the target.
#
# @background: copy data in background only.
#
# @write-blocking: when data is written to the source, write it
#                  (synchronously) to the target as well.  In
#                  addition, data is copied in background just like in
#                  @background mode.
#
# Since: 3.0
##
{ 'enum': 'MirrorCopyMode',
  'data': ['background', 'write-blocking'] }

##
# @BlockJobInfo:
#
# Information about a long-running block device operation.
#
# @type: the job type ('stream' for image streaming)
#
# @device: The job identifier. Originally the device name but other
#          values are allowed since QEMU 2.7
#
# @len: Estimated @offset value at the completion of the job. This value can
#       arbitrarily change while the job is running, in both directions.
#
# @offset: Progress made until now. The unit is arbitrary and the value can
#          only meaningfully be used for the ratio of @offset to @len. The
#          value is monotonically increasing.
#
# @busy: false if the job is known to be in a quiescent state, with
#        no pending I/O.  Since 1.3.
#
# @paused: whether the job is paused or, if @busy is true, will
#          pause itself as soon as possible.  Since 1.3.
#
# @speed: the rate limit, bytes per second
#
# @io-status: the status of the job (since 1.3)
#
# @ready: true if the job may be completed (since 2.2)
#
# @status: Current job state/status (since 2.12)
#
# @auto-finalize: Job will finalize itself when PENDING, moving to
#                 the CONCLUDED state. (since 2.12)
#
# @auto-dismiss: Job will dismiss itself when CONCLUDED, moving to the NULL
#                state and disappearing from the query list. (since 2.12)
#
# @error: Error information if the job did not complete successfully.
#         Not set if the job completed successfully. (since 2.12.1)
#
# Since: 1.1
##
{ 'struct': 'BlockJobInfo',
  'data': {'type': 'str', 'device': 'str', 'len': 'int',
           'offset': 'int', 'busy': 'bool', 'paused': 'bool', 'speed': 'int',
           'io-status': 'BlockDeviceIoStatus', 'ready': 'bool',
           'status': 'JobStatus',
           'auto-finalize': 'bool', 'auto-dismiss': 'bool',
           '*error': 'str' } }

##
# @query-block-jobs:
#
# Return information about long-running block device operations.
#
# Returns: a list of @BlockJobInfo for each active block job
#
# Since: 1.1
##
{ 'command': 'query-block-jobs', 'returns': ['BlockJobInfo'] }

##
# @block_passwd:
#
# This command sets the password of a block device that has not been open
# with a password and requires one.
#
# This command is now obsolete and will always return an error since 2.10
#
##
{ 'command': 'block_passwd',
  'data': { '*device': 'str',
            '*node-name': 'str',
            'password': 'str' } }

##
# @block_resize:
#
# Resize a block image while a guest is running.
#
# Either @device or @node-name must be set but not both.
#
# @device: the name of the device to get the image resized
#
# @node-name: graph node name to get the image resized (Since 2.0)
#
# @size:  new image size in bytes
#
# Returns: - nothing on success
#          - If @device is not a valid block device, DeviceNotFound
#
# Since: 0.14.0
#
# Example:
#
# -> { "execute": "block_resize",
#      "arguments": { "device": "scratch", "size": 1073741824 } }
# <- { "return": {} }
#
##
{ 'command': 'block_resize',
  'data': { '*device': 'str',
            '*node-name': 'str',
            'size': 'int' } }

##
# @NewImageMode:
#
# An enumeration that tells QEMU how to set the backing file path in
# a new image file.
#
# @existing: QEMU should look for an existing image file.
#
# @absolute-paths: QEMU should create a new image with absolute paths
#                  for the backing file. If there is no backing file available, the new
#                  image will not be backed either.
#
# Since: 1.1
##
{ 'enum': 'NewImageMode',
  'data': [ 'existing', 'absolute-paths' ] }

##
# @BlockdevSnapshotSync:
#
# Either @device or @node-name must be set but not both.
#
# @device: the name of the device to take a snapshot of.
#
# @node-name: graph node name to generate the snapshot from (Since 2.0)
#
# @snapshot-file: the target of the new overlay image. If the file
#                 exists, or if it is a device, the overlay will be created in the
#                 existing file/device. Otherwise, a new file will be created.
#
# @snapshot-node-name: the graph node name of the new image (Since 2.0)
#
# @format: the format of the overlay image, default is 'qcow2'.
#
# @mode: whether and how QEMU should create a new image, default is
#        'absolute-paths'.
##
{ 'struct': 'BlockdevSnapshotSync',
  'data': { '*device': 'str', '*node-name': 'str',
            'snapshot-file': 'str', '*snapshot-node-name': 'str',
            '*format': 'str', '*mode': 'NewImageMode' } }

##
# @BlockdevSnapshot:
#
# @node: device or node name that will have a snapshot taken.
#
# @overlay: reference to the existing block device that will become
#           the overlay of @node, as part of taking the snapshot.
#           It must not have a current backing file (this can be
#           achieved by passing "backing": null to blockdev-add).
#
# Since: 2.5
##
{ 'struct': 'BlockdevSnapshot',
  'data': { 'node': 'str', 'overlay': 'str' } }

##
# @BackupCommon:
#
# @job-id: identifier for the newly-created block job. If
#          omitted, the device name will be used. (Since 2.7)
#
# @device: the device name or node-name of a root node which should be copied.
#
# @sync: what parts of the disk image should be copied to the destination
#        (all the disk, only the sectors allocated in the topmost image, from a
#        dirty bitmap, or only new I/O).
#
# @speed: the maximum speed, in bytes per second. The default is 0,
#         for unlimited.
#
# @bitmap: The name of a dirty bitmap to use.
#          Must be present if sync is "bitmap" or "incremental".
#          Can be present if sync is "full" or "top".
#          Must not be present otherwise.
#          (Since 2.4 (drive-backup), 3.1 (blockdev-backup))
#
# @bitmap-mode: Specifies the type of data the bitmap should contain after
#               the operation concludes.
#               Must be present if a bitmap was provided,
#               Must NOT be present otherwise. (Since 4.2)
#
# @compress: true to compress data, if the target format supports it.
#            (default: false) (since 2.8)
#
# @on-source-error: the action to take on an error on the source,
#                   default 'report'.  'stop' and 'enospc' can only be used
#                   if the block device supports io-status (see BlockInfo).
#
# @on-target-error: the action to take on an error on the target,
#                   default 'report' (no limitations, since this applies to
#                   a different block device than @device).
#
# @auto-finalize: When false, this job will wait in a PENDING state after it has
#                 finished its work, waiting for @block-job-finalize before
#                 making any block graph changes.
#                 When true, this job will automatically
#                 perform its abort or commit actions.
#                 Defaults to true. (Since 2.12)
#
# @auto-dismiss: When false, this job will wait in a CONCLUDED state after it
#                has completely ceased all work, and awaits @block-job-dismiss.
#                When true, this job will automatically disappear from the query
#                list without user intervention.
#                Defaults to true. (Since 2.12)
#
# @filter-node-name: the node name that should be assigned to the
#                    filter driver that the backup job inserts into the graph
#                    above node specified by @drive. If this option is not given,
#                    a node name is autogenerated. (Since: 4.2)
#
# Note: @on-source-error and @on-target-error only affect background
#       I/O.  If an error occurs during a guest write request, the device's
#       rerror/werror actions will be used.
#
# Since: 4.2
##
{ 'struct': 'BackupCommon',
  'data': { '*job-id': 'str', 'device': 'str',
            'sync': 'MirrorSyncMode', '*speed': 'int',
            '*bitmap': 'str', '*bitmap-mode': 'BitmapSyncMode',
            '*compress': 'bool',
            '*on-source-error': 'BlockdevOnError',
            '*on-target-error': 'BlockdevOnError',
            '*auto-finalize': 'bool', '*auto-dismiss': 'bool',
            '*filter-node-name': 'str' } }

##
# @DriveBackup:
#
# @target: the target of the new image. If the file exists, or if it
#          is a device, the existing file/device will be used as the new
#          destination.  If it does not exist, a new file will be created.
#
# @format: the format of the new destination, default is to
#          probe if @mode is 'existing', else the format of the source
#
# @mode: whether and how QEMU should create a new image, default is
#        'absolute-paths'.
#
# Since: 1.6
##
{ 'struct': 'DriveBackup',
  'base': 'BackupCommon',
  'data': { 'target': 'str',
            '*format': 'str',
            '*mode': 'NewImageMode' } }

##
# @BlockdevBackup:
#
# @target: the device name or node-name of the backup target node.
#
# Since: 2.3
##
{ 'struct': 'BlockdevBackup',
  'base': 'BackupCommon',
  'data': { 'target': 'str' } }

##
# @blockdev-snapshot-sync:
#
# Takes a synchronous snapshot of a block device.
#
# For the arguments, see the documentation of BlockdevSnapshotSync.
#
# Returns: - nothing on success
#          - If @device is not a valid block device, DeviceNotFound
#
# Since: 0.14.0
#
# Example:
#
# -> { "execute": "blockdev-snapshot-sync",
#      "arguments": { "device": "ide-hd0",
#                     "snapshot-file":
#                     "/some/place/my-image",
#                     "format": "qcow2" } }
# <- { "return": {} }
#
##
{ 'command': 'blockdev-snapshot-sync',
  'data': 'BlockdevSnapshotSync' }


##
# @blockdev-snapshot:
#
# Takes a snapshot of a block device.
#
# Take a snapshot, by installing 'node' as the backing image of
# 'overlay'. Additionally, if 'node' is associated with a block
# device, the block device changes to using 'overlay' as its new active
# image.
#
# For the arguments, see the documentation of BlockdevSnapshot.
#
# Features:
# @allow-write-only-overlay: If present, the check whether this operation is safe
#                            was relaxed so that it can be used to change
#                            backing file of a destination of a blockdev-mirror.
#                            (since 5.0)
#
# Since: 2.5
#
# Example:
#
# -> { "execute": "blockdev-add",
#      "arguments": { "driver": "qcow2",
#                     "node-name": "node1534",
#                     "file": { "driver": "file",
#                               "filename": "hd1.qcow2" },
#                     "backing": null } }
#
# <- { "return": {} }
#
# -> { "execute": "blockdev-snapshot",
#      "arguments": { "node": "ide-hd0",
#                     "overlay": "node1534" } }
# <- { "return": {} }
#
##
{ 'command': 'blockdev-snapshot',
  'data': 'BlockdevSnapshot',
  'features': [ 'allow-write-only-overlay' ] }

##
# @change-backing-file:
#
# Change the backing file in the image file metadata.  This does not
# cause QEMU to reopen the image file to reparse the backing filename
# (it may, however, perform a reopen to change permissions from
# r/o -> r/w -> r/o, if needed). The new backing file string is written
# into the image file metadata, and the QEMU internal strings are
# updated.
#
# @image-node-name: The name of the block driver state node of the
#                   image to modify. The "device" argument is used
#                   to verify "image-node-name" is in the chain
#                   described by "device".
#
# @device: The device name or node-name of the root node that owns
#          image-node-name.
#
# @backing-file: The string to write as the backing file.  This
#                string is not validated, so care should be taken
#                when specifying the string or the image chain may
#                not be able to be reopened again.
#
# Returns: - Nothing on success
#          - If "device" does not exist or cannot be determined, DeviceNotFound
#
# Since: 2.1
##
{ 'command': 'change-backing-file',
  'data': { 'device': 'str', 'image-node-name': 'str',
            'backing-file': 'str' } }

##
# @block-commit:
#
# Live commit of data from overlay image nodes into backing nodes - i.e.,
# writes data between 'top' and 'base' into 'base'.
#
# @job-id: identifier for the newly-created block job. If
#          omitted, the device name will be used. (Since 2.7)
#
# @device: the device name or node-name of a root node
#
# @base-node: The node name of the backing image to write data into.
#             If not specified, this is the deepest backing image.
#             (since: 3.1)
#
# @base: Same as @base-node, except that it is a file name rather than a node
#        name. This must be the exact filename string that was used to open the
#        node; other strings, even if addressing the same file, are not
#        accepted (deprecated, use @base-node instead)
#
# @top-node: The node name of the backing image within the image chain
#            which contains the topmost data to be committed down. If
#            not specified, this is the active layer. (since: 3.1)
#
# @top: Same as @top-node, except that it is a file name rather than a node
#       name. This must be the exact filename string that was used to open the
#       node; other strings, even if addressing the same file, are not
#       accepted (deprecated, use @base-node instead)
#
# @backing-file: The backing file string to write into the overlay
#                image of 'top'.  If 'top' is the active layer,
#                specifying a backing file string is an error. This
#                filename is not validated.
#
#                If a pathname string is such that it cannot be
#                resolved by QEMU, that means that subsequent QMP or
#                HMP commands must use node-names for the image in
#                question, as filename lookup methods will fail.
#
#                If not specified, QEMU will automatically determine
#                the backing file string to use, or error out if
#                there is no obvious choice. Care should be taken
#                when specifying the string, to specify a valid
#                filename or protocol.
#                (Since 2.1)
#
#                If top == base, that is an error.
#                If top == active, the job will not be completed by itself,
#                user needs to complete the job with the block-job-complete
#                command after getting the ready event. (Since 2.0)
#
#                If the base image is smaller than top, then the base image
#                will be resized to be the same size as top.  If top is
#                smaller than the base image, the base will not be
#                truncated.  If you want the base image size to match the
#                size of the smaller top, you can safely truncate it
#                yourself once the commit operation successfully completes.
#
# @speed: the maximum speed, in bytes per second
#
# @on-error: the action to take on an error. 'ignore' means that the request
#            should be retried. (default: report; Since: 5.0)
#
# @filter-node-name: the node name that should be assigned to the
#                    filter driver that the commit job inserts into the graph
#                    above @top. If this option is not given, a node name is
#                    autogenerated. (Since: 2.9)
#
# @auto-finalize: When false, this job will wait in a PENDING state after it has
#                 finished its work, waiting for @block-job-finalize before
#                 making any block graph changes.
#                 When true, this job will automatically
#                 perform its abort or commit actions.
#                 Defaults to true. (Since 3.1)
#
# @auto-dismiss: When false, this job will wait in a CONCLUDED state after it
#                has completely ceased all work, and awaits @block-job-dismiss.
#                When true, this job will automatically disappear from the query
#                list without user intervention.
#                Defaults to true. (Since 3.1)
#
# Returns: - Nothing on success
#          - If @device does not exist, DeviceNotFound
#          - Any other error returns a GenericError.
#
# Since: 1.3
#
# Example:
#
# -> { "execute": "block-commit",
#      "arguments": { "device": "virtio0",
#                     "top": "/tmp/snap1.qcow2" } }
# <- { "return": {} }
#
##
{ 'command': 'block-commit',
  'data': { '*job-id': 'str', 'device': 'str', '*base-node': 'str',
            '*base': 'str', '*top-node': 'str', '*top': 'str',
            '*backing-file': 'str', '*speed': 'int',
            '*on-error': 'BlockdevOnError',
            '*filter-node-name': 'str',
            '*auto-finalize': 'bool', '*auto-dismiss': 'bool' } }

##
# @drive-backup:
#
# Start a point-in-time copy of a block device to a new destination.  The
# status of ongoing drive-backup operations can be checked with
# query-block-jobs where the BlockJobInfo.type field has the value 'backup'.
# The operation can be stopped before it has completed using the
# block-job-cancel command.
#
# Returns: - nothing on success
#          - If @device is not a valid block device, GenericError
#
# Since: 1.6
#
# Example:
#
# -> { "execute": "drive-backup",
#      "arguments": { "device": "drive0",
#                     "sync": "full",
#                     "target": "backup.img" } }
# <- { "return": {} }
#
##
{ 'command': 'drive-backup', 'boxed': true,
  'data': 'DriveBackup' }

##
# @blockdev-backup:
#
# Start a point-in-time copy of a block device to a new destination.  The
# status of ongoing blockdev-backup operations can be checked with
# query-block-jobs where the BlockJobInfo.type field has the value 'backup'.
# The operation can be stopped before it has completed using the
# block-job-cancel command.
#
# Returns: - nothing on success
#          - If @device is not a valid block device, DeviceNotFound
#
# Since: 2.3
#
# Example:
# -> { "execute": "blockdev-backup",
#      "arguments": { "device": "src-id",
#                     "sync": "full",
#                     "target": "tgt-id" } }
# <- { "return": {} }
#
##
{ 'command': 'blockdev-backup', 'boxed': true,
  'data': 'BlockdevBackup' }


##
# @query-named-block-nodes:
#
# Get the named block driver list
#
# @flat: Omit the nested data about backing image ("backing-image" key) if true.
#        Default is false (Since 5.0)
#
# Returns: the list of BlockDeviceInfo
#
# Since: 2.0
#
# Example:
#
# -> { "execute": "query-named-block-nodes" }
# <- { "return": [ { "ro":false,
#                    "drv":"qcow2",
#                    "encrypted":false,
#                    "file":"disks/test.qcow2",
#                    "node-name": "my-node",
#                    "backing_file_depth":1,
#                    "bps":1000000,
#                    "bps_rd":0,
#                    "bps_wr":0,
#                    "iops":1000000,
#                    "iops_rd":0,
#                    "iops_wr":0,
#                    "bps_max": 8000000,
#                    "bps_rd_max": 0,
#                    "bps_wr_max": 0,
#                    "iops_max": 0,
#                    "iops_rd_max": 0,
#                    "iops_wr_max": 0,
#                    "iops_size": 0,
#                    "write_threshold": 0,
#                    "image":{
#                       "filename":"disks/test.qcow2",
#                       "format":"qcow2",
#                       "virtual-size":2048000,
#                       "backing_file":"base.qcow2",
#                       "full-backing-filename":"disks/base.qcow2",
#                       "backing-filename-format":"qcow2",
#                       "snapshots":[
#                          {
#                             "id": "1",
#                             "name": "snapshot1",
#                             "vm-state-size": 0,
#                             "date-sec": 10000200,
#                             "date-nsec": 12,
#                             "vm-clock-sec": 206,
#                             "vm-clock-nsec": 30
#                          }
#                       ],
#                       "backing-image":{
#                           "filename":"disks/base.qcow2",
#                           "format":"qcow2",
#                           "virtual-size":2048000
#                       }
#                    } } ] }
#
##
{ 'command': 'query-named-block-nodes',
  'returns': [ 'BlockDeviceInfo' ],
  'data': { '*flat': 'bool' } }

##
# @XDbgBlockGraphNodeType:
#
# @block-backend: corresponds to BlockBackend
#
# @block-job: corresonds to BlockJob
#
# @block-driver: corresponds to BlockDriverState
#
# Since: 4.0
##
{ 'enum': 'XDbgBlockGraphNodeType',
  'data': [ 'block-backend', 'block-job', 'block-driver' ] }

##
# @XDbgBlockGraphNode:
#
# @id: Block graph node identifier. This @id is generated only for
#      x-debug-query-block-graph and does not relate to any other identifiers in
#      Qemu.
#
# @type: Type of graph node. Can be one of block-backend, block-job or
#        block-driver-state.
#
# @name: Human readable name of the node. Corresponds to node-name for
#        block-driver-state nodes; is not guaranteed to be unique in the whole
#        graph (with block-jobs and block-backends).
#
# Since: 4.0
##
{ 'struct': 'XDbgBlockGraphNode',
  'data': { 'id': 'uint64', 'type': 'XDbgBlockGraphNodeType', 'name': 'str' } }

##
# @BlockPermission:
#
# Enum of base block permissions.
#
# @consistent-read: A user that has the "permission" of consistent reads is
#                   guaranteed that their view of the contents of the block
#                   device is complete and self-consistent, representing the
#                   contents of a disk at a specific point.
#                   For most block devices (including their backing files) this
#                   is true, but the property cannot be maintained in a few
#                   situations like for intermediate nodes of a commit block
#                   job.
#
# @write: This permission is required to change the visible disk contents.
#
# @write-unchanged: This permission (which is weaker than BLK_PERM_WRITE) is
#                   both enough and required for writes to the block node when
#                   the caller promises that the visible disk content doesn't
#                   change.
#                   As the BLK_PERM_WRITE permission is strictly stronger,
#                   either is sufficient to perform an unchanging write.
#
# @resize: This permission is required to change the size of a block node.
#
# @graph-mod: This permission is required to change the node that this
#             BdrvChild points to.
#
# Since: 4.0
##
  { 'enum': 'BlockPermission',
    'data': [ 'consistent-read', 'write', 'write-unchanged', 'resize',
              'graph-mod' ] }
##
# @XDbgBlockGraphEdge:
#
# Block Graph edge description for x-debug-query-block-graph.
#
# @parent: parent id
#
# @child: child id
#
# @name: name of the relation (examples are 'file' and 'backing')
#
# @perm: granted permissions for the parent operating on the child
#
# @shared-perm: permissions that can still be granted to other users of the
#               child while it is still attached to this parent
#
# Since: 4.0
##
{ 'struct': 'XDbgBlockGraphEdge',
  'data': { 'parent': 'uint64', 'child': 'uint64',
            'name': 'str', 'perm': [ 'BlockPermission' ],
            'shared-perm': [ 'BlockPermission' ] } }

##
# @XDbgBlockGraph:
#
# Block Graph - list of nodes and list of edges.
#
# Since: 4.0
##
{ 'struct': 'XDbgBlockGraph',
  'data': { 'nodes': ['XDbgBlockGraphNode'], 'edges': ['XDbgBlockGraphEdge'] } }

##
# @x-debug-query-block-graph:
#
# Get the block graph.
#
# Since: 4.0
##
{ 'command': 'x-debug-query-block-graph', 'returns': 'XDbgBlockGraph' }

##
# @drive-mirror:
#
# Start mirroring a block device's writes to a new destination. target
# specifies the target of the new image. If the file exists, or if it
# is a device, it will be used as the new destination for writes. If
# it does not exist, a new file will be created. format specifies the
# format of the mirror image, default is to probe if mode='existing',
# else the format of the source.
#
# Returns: - nothing on success
#          - If @device is not a valid block device, GenericError
#
# Since: 1.3
#
# Example:
#
# -> { "execute": "drive-mirror",
#      "arguments": { "device": "ide-hd0",
#                     "target": "/some/place/my-image",
#                     "sync": "full",
#                     "format": "qcow2" } }
# <- { "return": {} }
#
##
{ 'command': 'drive-mirror', 'boxed': true,
  'data': 'DriveMirror' }

##
# @DriveMirror:
#
# A set of parameters describing drive mirror setup.
#
# @job-id: identifier for the newly-created block job. If
#          omitted, the device name will be used. (Since 2.7)
#
# @device:  the device name or node-name of a root node whose writes should be
#           mirrored.
#
# @target: the target of the new image. If the file exists, or if it
#          is a device, the existing file/device will be used as the new
#          destination.  If it does not exist, a new file will be created.
#
# @format: the format of the new destination, default is to
#          probe if @mode is 'existing', else the format of the source
#
# @node-name: the new block driver state node name in the graph
#             (Since 2.1)
#
# @replaces: with sync=full graph node name to be replaced by the new
#            image when a whole image copy is done. This can be used to repair
#            broken Quorum files. (Since 2.1)
#
# @mode: whether and how QEMU should create a new image, default is
#        'absolute-paths'.
#
# @speed:  the maximum speed, in bytes per second
#
# @sync: what parts of the disk image should be copied to the destination
#        (all the disk, only the sectors allocated in the topmost image, or
#        only new I/O).
#
# @granularity: granularity of the dirty bitmap, default is 64K
#               if the image format doesn't have clusters, 4K if the clusters
#               are smaller than that, else the cluster size.  Must be a
#               power of 2 between 512 and 64M (since 1.4).
#
# @buf-size: maximum amount of data in flight from source to
#            target (since 1.4).
#
# @on-source-error: the action to take on an error on the source,
#                   default 'report'.  'stop' and 'enospc' can only be used
#                   if the block device supports io-status (see BlockInfo).
#
# @on-target-error: the action to take on an error on the target,
#                   default 'report' (no limitations, since this applies to
#                   a different block device than @device).
# @unmap: Whether to try to unmap target sectors where source has
#         only zero. If true, and target unallocated sectors will read as zero,
#         target image sectors will be unmapped; otherwise, zeroes will be
#         written. Both will result in identical contents.
#         Default is true. (Since 2.4)
#
# @copy-mode: when to copy data to the destination; defaults to 'background'
#             (Since: 3.0)
#
# @auto-finalize: When false, this job will wait in a PENDING state after it has
#                 finished its work, waiting for @block-job-finalize before
#                 making any block graph changes.
#                 When true, this job will automatically
#                 perform its abort or commit actions.
#                 Defaults to true. (Since 3.1)
#
# @auto-dismiss: When false, this job will wait in a CONCLUDED state after it
#                has completely ceased all work, and awaits @block-job-dismiss.
#                When true, this job will automatically disappear from the query
#                list without user intervention.
#                Defaults to true. (Since 3.1)
# Since: 1.3
##
{ 'struct': 'DriveMirror',
  'data': { '*job-id': 'str', 'device': 'str', 'target': 'str',
            '*format': 'str', '*node-name': 'str', '*replaces': 'str',
            'sync': 'MirrorSyncMode', '*mode': 'NewImageMode',
            '*speed': 'int', '*granularity': 'uint32',
            '*buf-size': 'int', '*on-source-error': 'BlockdevOnError',
            '*on-target-error': 'BlockdevOnError',
            '*unmap': 'bool', '*copy-mode': 'MirrorCopyMode',
            '*auto-finalize': 'bool', '*auto-dismiss': 'bool' } }

##
# @BlockDirtyBitmap:
#
# @node: name of device/node which the bitmap is tracking
#
# @name: name of the dirty bitmap
#
# Since: 2.4
##
{ 'struct': 'BlockDirtyBitmap',
  'data': { 'node': 'str', 'name': 'str' } }

##
# @BlockDirtyBitmapAdd:
#
# @node: name of device/node which the bitmap is tracking
#
# @name: name of the dirty bitmap (must be less than 1024 bytes)
#
# @granularity: the bitmap granularity, default is 64k for
#               block-dirty-bitmap-add
#
# @persistent: the bitmap is persistent, i.e. it will be saved to the
#              corresponding block device image file on its close. For now only
#              Qcow2 disks support persistent bitmaps. Default is false for
#              block-dirty-bitmap-add. (Since: 2.10)
#
# @disabled: the bitmap is created in the disabled state, which means that
#            it will not track drive changes. The bitmap may be enabled with
#            block-dirty-bitmap-enable. Default is false. (Since: 4.0)
#
# Since: 2.4
##
{ 'struct': 'BlockDirtyBitmapAdd',
  'data': { 'node': 'str', 'name': 'str', '*granularity': 'uint32',
            '*persistent': 'bool', '*disabled': 'bool' } }

##
# @BlockDirtyBitmapMergeSource:
#
# @local: name of the bitmap, attached to the same node as target bitmap.
#
# @external: bitmap with specified node
#
# Since: 4.1
##
{ 'alternate': 'BlockDirtyBitmapMergeSource',
  'data': { 'local': 'str',
            'external': 'BlockDirtyBitmap' } }

##
# @BlockDirtyBitmapMerge:
#
# @node: name of device/node which the @target bitmap is tracking
#
# @target: name of the destination dirty bitmap
#
# @bitmaps: name(s) of the source dirty bitmap(s) at @node and/or fully
#           specifed BlockDirtyBitmap elements. The latter are supported
#           since 4.1.
#
# Since: 4.0
##
{ 'struct': 'BlockDirtyBitmapMerge',
  'data': { 'node': 'str', 'target': 'str',
            'bitmaps': ['BlockDirtyBitmapMergeSource'] } }

##
# @block-dirty-bitmap-add:
#
# Create a dirty bitmap with a name on the node, and start tracking the writes.
#
# Returns: - nothing on success
#          - If @node is not a valid block device or node, DeviceNotFound
#          - If @name is already taken, GenericError with an explanation
#
# Since: 2.4
#
# Example:
#
# -> { "execute": "block-dirty-bitmap-add",
#      "arguments": { "node": "drive0", "name": "bitmap0" } }
# <- { "return": {} }
#
##
{ 'command': 'block-dirty-bitmap-add',
  'data': 'BlockDirtyBitmapAdd' }

##
# @block-dirty-bitmap-remove:
#
# Stop write tracking and remove the dirty bitmap that was created
# with block-dirty-bitmap-add. If the bitmap is persistent, remove it from its
# storage too.
#
# Returns: - nothing on success
#          - If @node is not a valid block device or node, DeviceNotFound
#          - If @name is not found, GenericError with an explanation
#          - if @name is frozen by an operation, GenericError
#
# Since: 2.4
#
# Example:
#
# -> { "execute": "block-dirty-bitmap-remove",
#      "arguments": { "node": "drive0", "name": "bitmap0" } }
# <- { "return": {} }
#
##
{ 'command': 'block-dirty-bitmap-remove',
  'data': 'BlockDirtyBitmap' }

##
# @block-dirty-bitmap-clear:
#
# Clear (reset) a dirty bitmap on the device, so that an incremental
# backup from this point in time forward will only backup clusters
# modified after this clear operation.
#
# Returns: - nothing on success
#          - If @node is not a valid block device, DeviceNotFound
#          - If @name is not found, GenericError with an explanation
#
# Since: 2.4
#
# Example:
#
# -> { "execute": "block-dirty-bitmap-clear",
#      "arguments": { "node": "drive0", "name": "bitmap0" } }
# <- { "return": {} }
#
##
{ 'command': 'block-dirty-bitmap-clear',
  'data': 'BlockDirtyBitmap' }

##
# @block-dirty-bitmap-enable:
#
# Enables a dirty bitmap so that it will begin tracking disk changes.
#
# Returns: - nothing on success
#          - If @node is not a valid block device, DeviceNotFound
#          - If @name is not found, GenericError with an explanation
#
# Since: 4.0
#
# Example:
#
# -> { "execute": "block-dirty-bitmap-enable",
#      "arguments": { "node": "drive0", "name": "bitmap0" } }
# <- { "return": {} }
#
##
  { 'command': 'block-dirty-bitmap-enable',
    'data': 'BlockDirtyBitmap' }

##
# @block-dirty-bitmap-disable:
#
# Disables a dirty bitmap so that it will stop tracking disk changes.
#
# Returns: - nothing on success
#          - If @node is not a valid block device, DeviceNotFound
#          - If @name is not found, GenericError with an explanation
#
# Since: 4.0
#
# Example:
#
# -> { "execute": "block-dirty-bitmap-disable",
#      "arguments": { "node": "drive0", "name": "bitmap0" } }
# <- { "return": {} }
#
##
    { 'command': 'block-dirty-bitmap-disable',
      'data': 'BlockDirtyBitmap' }

##
# @block-dirty-bitmap-merge:
#
# Merge dirty bitmaps listed in @bitmaps to the @target dirty bitmap.
# Dirty bitmaps in @bitmaps will be unchanged, except if it also appears
# as the @target bitmap. Any bits already set in @target will still be
# set after the merge, i.e., this operation does not clear the target.
# On error, @target is unchanged.
#
# The resulting bitmap will count as dirty any clusters that were dirty in any
# of the source bitmaps. This can be used to achieve backup checkpoints, or in
# simpler usages, to copy bitmaps.
#
# Returns: - nothing on success
#          - If @node is not a valid block device, DeviceNotFound
#          - If any bitmap in @bitmaps or @target is not found, GenericError
#          - If any of the bitmaps have different sizes or granularities,
#            GenericError
#
# Since: 4.0
#
# Example:
#
# -> { "execute": "block-dirty-bitmap-merge",
#      "arguments": { "node": "drive0", "target": "bitmap0",
#                     "bitmaps": ["bitmap1"] } }
# <- { "return": {} }
#
##
      { 'command': 'block-dirty-bitmap-merge',
        'data': 'BlockDirtyBitmapMerge' }

##
# @BlockDirtyBitmapSha256:
#
# SHA256 hash of dirty bitmap data
#
# @sha256: ASCII representation of SHA256 bitmap hash
#
# Since: 2.10
##
  { 'struct': 'BlockDirtyBitmapSha256',
    'data': {'sha256': 'str'} }

##
# @x-debug-block-dirty-bitmap-sha256:
#
# Get bitmap SHA256.
#
# Returns: - BlockDirtyBitmapSha256 on success
#          - If @node is not a valid block device, DeviceNotFound
#          - If @name is not found or if hashing has failed, GenericError with an
#            explanation
#
# Since: 2.10
##
  { 'command': 'x-debug-block-dirty-bitmap-sha256',
    'data': 'BlockDirtyBitmap', 'returns': 'BlockDirtyBitmapSha256' }

##
# @blockdev-mirror:
#
# Start mirroring a block device's writes to a new destination.
#
# @job-id: identifier for the newly-created block job. If
#          omitted, the device name will be used. (Since 2.7)
#
# @device: The device name or node-name of a root node whose writes should be
#          mirrored.
#
# @target: the id or node-name of the block device to mirror to. This mustn't be
#          attached to guest.
#
# @replaces: with sync=full graph node name to be replaced by the new
#            image when a whole image copy is done. This can be used to repair
#            broken Quorum files.
#
# @speed:  the maximum speed, in bytes per second
#
# @sync: what parts of the disk image should be copied to the destination
#        (all the disk, only the sectors allocated in the topmost image, or
#        only new I/O).
#
# @granularity: granularity of the dirty bitmap, default is 64K
#               if the image format doesn't have clusters, 4K if the clusters
#               are smaller than that, else the cluster size.  Must be a
#               power of 2 between 512 and 64M
#
# @buf-size: maximum amount of data in flight from source to
#            target
#
# @on-source-error: the action to take on an error on the source,
#                   default 'report'.  'stop' and 'enospc' can only be used
#                   if the block device supports io-status (see BlockInfo).
#
# @on-target-error: the action to take on an error on the target,
#                   default 'report' (no limitations, since this applies to
#                   a different block device than @device).
#
# @filter-node-name: the node name that should be assigned to the
#                    filter driver that the mirror job inserts into the graph
#                    above @device. If this option is not given, a node name is
#                    autogenerated. (Since: 2.9)
#
# @copy-mode: when to copy data to the destination; defaults to 'background'
#             (Since: 3.0)
#
# @auto-finalize: When false, this job will wait in a PENDING state after it has
#                 finished its work, waiting for @block-job-finalize before
#                 making any block graph changes.
#                 When true, this job will automatically
#                 perform its abort or commit actions.
#                 Defaults to true. (Since 3.1)
#
# @auto-dismiss: When false, this job will wait in a CONCLUDED state after it
#                has completely ceased all work, and awaits @block-job-dismiss.
#                When true, this job will automatically disappear from the query
#                list without user intervention.
#                Defaults to true. (Since 3.1)
# Returns: nothing on success.
#
# Since: 2.6
#
# Example:
#
# -> { "execute": "blockdev-mirror",
#      "arguments": { "device": "ide-hd0",
#                     "target": "target0",
#                     "sync": "full" } }
# <- { "return": {} }
#
##
{ 'command': 'blockdev-mirror',
  'data': { '*job-id': 'str', 'device': 'str', 'target': 'str',
            '*replaces': 'str',
            'sync': 'MirrorSyncMode',
            '*speed': 'int', '*granularity': 'uint32',
            '*buf-size': 'int', '*on-source-error': 'BlockdevOnError',
            '*on-target-error': 'BlockdevOnError',
            '*filter-node-name': 'str',
            '*copy-mode': 'MirrorCopyMode',
            '*auto-finalize': 'bool', '*auto-dismiss': 'bool' } }

##
# @BlockIOThrottle:
#
# A set of parameters describing block throttling.
#
# @device: Block device name (deprecated, use @id instead)
#
# @id: The name or QOM path of the guest device (since: 2.8)
#
# @bps: total throughput limit in bytes per second
#
# @bps_rd: read throughput limit in bytes per second
#
# @bps_wr: write throughput limit in bytes per second
#
# @iops: total I/O operations per second
#
# @iops_rd: read I/O operations per second
#
# @iops_wr: write I/O operations per second
#
# @bps_max: total throughput limit during bursts,
#           in bytes (Since 1.7)
#
# @bps_rd_max: read throughput limit during bursts,
#              in bytes (Since 1.7)
#
# @bps_wr_max: write throughput limit during bursts,
#              in bytes (Since 1.7)
#
# @iops_max: total I/O operations per second during bursts,
#            in bytes (Since 1.7)
#
# @iops_rd_max: read I/O operations per second during bursts,
#               in bytes (Since 1.7)
#
# @iops_wr_max: write I/O operations per second during bursts,
#               in bytes (Since 1.7)
#
# @bps_max_length: maximum length of the @bps_max burst
#                  period, in seconds. It must only
#                  be set if @bps_max is set as well.
#                  Defaults to 1. (Since 2.6)
#
# @bps_rd_max_length: maximum length of the @bps_rd_max
#                     burst period, in seconds. It must only
#                     be set if @bps_rd_max is set as well.
#                     Defaults to 1. (Since 2.6)
#
# @bps_wr_max_length: maximum length of the @bps_wr_max
#                     burst period, in seconds. It must only
#                     be set if @bps_wr_max is set as well.
#                     Defaults to 1. (Since 2.6)
#
# @iops_max_length: maximum length of the @iops burst
#                   period, in seconds. It must only
#                   be set if @iops_max is set as well.
#                   Defaults to 1. (Since 2.6)
#
# @iops_rd_max_length: maximum length of the @iops_rd_max
#                      burst period, in seconds. It must only
#                      be set if @iops_rd_max is set as well.
#                      Defaults to 1. (Since 2.6)
#
# @iops_wr_max_length: maximum length of the @iops_wr_max
#                      burst period, in seconds. It must only
#                      be set if @iops_wr_max is set as well.
#                      Defaults to 1. (Since 2.6)
#
# @iops_size: an I/O size in bytes (Since 1.7)
#
# @group: throttle group name (Since 2.4)
#
# Since: 1.1
##
{ 'struct': 'BlockIOThrottle',
  'data': { '*device': 'str', '*id': 'str', 'bps': 'int', 'bps_rd': 'int',
            'bps_wr': 'int', 'iops': 'int', 'iops_rd': 'int', 'iops_wr': 'int',
            '*bps_max': 'int', '*bps_rd_max': 'int',
            '*bps_wr_max': 'int', '*iops_max': 'int',
            '*iops_rd_max': 'int', '*iops_wr_max': 'int',
            '*bps_max_length': 'int', '*bps_rd_max_length': 'int',
            '*bps_wr_max_length': 'int', '*iops_max_length': 'int',
            '*iops_rd_max_length': 'int', '*iops_wr_max_length': 'int',
            '*iops_size': 'int', '*group': 'str' } }

##
# @ThrottleLimits:
#
# Limit parameters for throttling.
# Since some limit combinations are illegal, limits should always be set in one
# transaction. All fields are optional. When setting limits, if a field is
# missing the current value is not changed.
#
# @iops-total: limit total I/O operations per second
# @iops-total-max: I/O operations burst
# @iops-total-max-length: length of the iops-total-max burst period, in seconds
#                         It must only be set if @iops-total-max is set as well.
# @iops-read: limit read operations per second
# @iops-read-max: I/O operations read burst
# @iops-read-max-length: length of the iops-read-max burst period, in seconds
#                        It must only be set if @iops-read-max is set as well.
# @iops-write: limit write operations per second
# @iops-write-max: I/O operations write burst
# @iops-write-max-length: length of the iops-write-max burst period, in seconds
#                         It must only be set if @iops-write-max is set as well.
# @bps-total: limit total bytes per second
# @bps-total-max: total bytes burst
# @bps-total-max-length: length of the bps-total-max burst period, in seconds.
#                        It must only be set if @bps-total-max is set as well.
# @bps-read: limit read bytes per second
# @bps-read-max: total bytes read burst
# @bps-read-max-length: length of the bps-read-max burst period, in seconds
#                       It must only be set if @bps-read-max is set as well.
# @bps-write: limit write bytes per second
# @bps-write-max: total bytes write burst
# @bps-write-max-length: length of the bps-write-max burst period, in seconds
#                        It must only be set if @bps-write-max is set as well.
# @iops-size: when limiting by iops max size of an I/O in bytes
#
# Since: 2.11
##
{ 'struct': 'ThrottleLimits',
  'data': { '*iops-total' : 'int', '*iops-total-max' : 'int',
            '*iops-total-max-length' : 'int', '*iops-read' : 'int',
            '*iops-read-max' : 'int', '*iops-read-max-length' : 'int',
            '*iops-write' : 'int', '*iops-write-max' : 'int',
            '*iops-write-max-length' : 'int', '*bps-total' : 'int',
            '*bps-total-max' : 'int', '*bps-total-max-length' : 'int',
            '*bps-read' : 'int', '*bps-read-max' : 'int',
            '*bps-read-max-length' : 'int', '*bps-write' : 'int',
            '*bps-write-max' : 'int', '*bps-write-max-length' : 'int',
            '*iops-size' : 'int' } }

##
# @block-stream:
#
# Copy data from a backing file into a block device.
#
# The block streaming operation is performed in the background until the entire
# backing file has been copied.  This command returns immediately once streaming
# has started.  The status of ongoing block streaming operations can be checked
# with query-block-jobs.  The operation can be stopped before it has completed
# using the block-job-cancel command.
#
# The node that receives the data is called the top image, can be located in
# any part of the chain (but always above the base image; see below) and can be
# specified using its device or node name. Earlier qemu versions only allowed
# 'device' to name the top level node; presence of the 'base-node' parameter
# during introspection can be used as a witness of the enhanced semantics
# of 'device'.
#
# If a base file is specified then sectors are not copied from that base file and
# its backing chain.  When streaming completes the image file will have the base
# file as its backing file.  This can be used to stream a subset of the backing
# file chain instead of flattening the entire image.
#
# On successful completion the image file is updated to drop the backing file
# and the BLOCK_JOB_COMPLETED event is emitted.
#
# @job-id: identifier for the newly-created block job. If
#          omitted, the device name will be used. (Since 2.7)
#
# @device: the device or node name of the top image
#
# @base: the common backing file name.
#        It cannot be set if @base-node is also set.
#
# @base-node: the node name of the backing file.
#             It cannot be set if @base is also set. (Since 2.8)
#
# @backing-file: The backing file string to write into the top
#                image. This filename is not validated.
#
#                If a pathname string is such that it cannot be
#                resolved by QEMU, that means that subsequent QMP or
#                HMP commands must use node-names for the image in
#                question, as filename lookup methods will fail.
#
#                If not specified, QEMU will automatically determine
#                the backing file string to use, or error out if there
#                is no obvious choice.  Care should be taken when
#                specifying the string, to specify a valid filename or
#                protocol.
#                (Since 2.1)
#
# @speed: the maximum speed, in bytes per second
#
# @on-error: the action to take on an error (default report).
#            'stop' and 'enospc' can only be used if the block device
#            supports io-status (see BlockInfo).  Since 1.3.
#
# @auto-finalize: When false, this job will wait in a PENDING state after it has
#                 finished its work, waiting for @block-job-finalize before
#                 making any block graph changes.
#                 When true, this job will automatically
#                 perform its abort or commit actions.
#                 Defaults to true. (Since 3.1)
#
# @auto-dismiss: When false, this job will wait in a CONCLUDED state after it
#                has completely ceased all work, and awaits @block-job-dismiss.
#                When true, this job will automatically disappear from the query
#                list without user intervention.
#                Defaults to true. (Since 3.1)
#
# Returns: - Nothing on success.
#          - If @device does not exist, DeviceNotFound.
#
# Since: 1.1
#
# Example:
#
# -> { "execute": "block-stream",
#      "arguments": { "device": "virtio0",
#                     "base": "/tmp/master.qcow2" } }
# <- { "return": {} }
#
##
{ 'command': 'block-stream',
  'data': { '*job-id': 'str', 'device': 'str', '*base': 'str',
            '*base-node': 'str', '*backing-file': 'str', '*speed': 'int',
            '*on-error': 'BlockdevOnError',
            '*auto-finalize': 'bool', '*auto-dismiss': 'bool' } }

##
# @block-job-set-speed:
#
# Set maximum speed for a background block operation.
#
# This command can only be issued when there is an active block job.
#
# Throttling can be disabled by setting the speed to 0.
#
# @device: The job identifier. This used to be a device name (hence
#          the name of the parameter), but since QEMU 2.7 it can have
#          other values.
#
# @speed: the maximum speed, in bytes per second, or 0 for unlimited.
#         Defaults to 0.
#
# Returns: - Nothing on success
#          - If no background operation is active on this device, DeviceNotActive
#
# Since: 1.1
##
{ 'command': 'block-job-set-speed',
  'data': { 'device': 'str', 'speed': 'int' } }

##
# @block-job-cancel:
#
# Stop an active background block operation.
#
# This command returns immediately after marking the active background block
# operation for cancellation.  It is an error to call this command if no
# operation is in progress.
#
# The operation will cancel as soon as possible and then emit the
# BLOCK_JOB_CANCELLED event.  Before that happens the job is still visible when
# enumerated using query-block-jobs.
#
# Note that if you issue 'block-job-cancel' after 'drive-mirror' has indicated
# (via the event BLOCK_JOB_READY) that the source and destination are
# synchronized, then the event triggered by this command changes to
# BLOCK_JOB_COMPLETED, to indicate that the mirroring has ended and the
# destination now has a point-in-time copy tied to the time of the cancellation.
#
# For streaming, the image file retains its backing file unless the streaming
# operation happens to complete just as it is being cancelled.  A new streaming
# operation can be started at a later time to finish copying all data from the
# backing file.
#
# @device: The job identifier. This used to be a device name (hence
#          the name of the parameter), but since QEMU 2.7 it can have
#          other values.
#
# @force: If true, and the job has already emitted the event BLOCK_JOB_READY,
#         abandon the job immediately (even if it is paused) instead of waiting
#         for the destination to complete its final synchronization (since 1.3)
#
# Returns: - Nothing on success
#          - If no background operation is active on this device, DeviceNotActive
#
# Since: 1.1
##
{ 'command': 'block-job-cancel', 'data': { 'device': 'str', '*force': 'bool' } }

##
# @block-job-pause:
#
# Pause an active background block operation.
#
# This command returns immediately after marking the active background block
# operation for pausing.  It is an error to call this command if no
# operation is in progress or if the job is already paused.
#
# The operation will pause as soon as possible.  No event is emitted when
# the operation is actually paused.  Cancelling a paused job automatically
# resumes it.
#
# @device: The job identifier. This used to be a device name (hence
#          the name of the parameter), but since QEMU 2.7 it can have
#          other values.
#
# Returns: - Nothing on success
#          - If no background operation is active on this device, DeviceNotActive
#
# Since: 1.3
##
{ 'command': 'block-job-pause', 'data': { 'device': 'str' } }

##
# @block-job-resume:
#
# Resume an active background block operation.
#
# This command returns immediately after resuming a paused background block
# operation.  It is an error to call this command if no operation is in
# progress or if the job is not paused.
#
# This command also clears the error status of the job.
#
# @device: The job identifier. This used to be a device name (hence
#          the name of the parameter), but since QEMU 2.7 it can have
#          other values.
#
# Returns: - Nothing on success
#          - If no background operation is active on this device, DeviceNotActive
#
# Since: 1.3
##
{ 'command': 'block-job-resume', 'data': { 'device': 'str' } }

##
# @block-job-complete:
#
# Manually trigger completion of an active background block operation.  This
# is supported for drive mirroring, where it also switches the device to
# write to the target path only.  The ability to complete is signaled with
# a BLOCK_JOB_READY event.
#
# This command completes an active background block operation synchronously.
# The ordering of this command's return with the BLOCK_JOB_COMPLETED event
# is not defined.  Note that if an I/O error occurs during the processing of
# this command: 1) the command itself will fail; 2) the error will be processed
# according to the rerror/werror arguments that were specified when starting
# the operation.
#
# A cancelled or paused job cannot be completed.
#
# @device: The job identifier. This used to be a device name (hence
#          the name of the parameter), but since QEMU 2.7 it can have
#          other values.
#
# Returns: - Nothing on success
#          - If no background operation is active on this device, DeviceNotActive
#
# Since: 1.3
##
{ 'command': 'block-job-complete', 'data': { 'device': 'str' } }

##
# @block-job-dismiss:
#
# For jobs that have already concluded, remove them from the block-job-query
# list. This command only needs to be run for jobs which were started with
# QEMU 2.12+ job lifetime management semantics.
#
# This command will refuse to operate on any job that has not yet reached
# its terminal state, JOB_STATUS_CONCLUDED. For jobs that make use of the
# BLOCK_JOB_READY event, block-job-cancel or block-job-complete will still need
# to be used as appropriate.
#
# @id: The job identifier.
#
# Returns: Nothing on success
#
# Since: 2.12
##
{ 'command': 'block-job-dismiss', 'data': { 'id': 'str' } }

##
# @block-job-finalize:
#
# Once a job that has manual=true reaches the pending state, it can be
# instructed to finalize any graph changes and do any necessary cleanup
# via this command.
# For jobs in a transaction, instructing one job to finalize will force
# ALL jobs in the transaction to finalize, so it is only necessary to instruct
# a single member job to finalize.
#
# @id: The job identifier.
#
# Returns: Nothing on success
#
# Since: 2.12
##
{ 'command': 'block-job-finalize', 'data': { 'id': 'str' } }

##
# @BlockdevDiscardOptions:
#
# Determines how to handle discard requests.
#
# @ignore: Ignore the request
# @unmap: Forward as an unmap request
#
# Since: 2.9
##
{ 'enum': 'BlockdevDiscardOptions',
  'data': [ 'ignore', 'unmap' ] }

##
# @BlockdevDetectZeroesOptions:
#
# Describes the operation mode for the automatic conversion of plain
# zero writes by the OS to driver specific optimized zero write commands.
#
# @off: Disabled (default)
# @on: Enabled
# @unmap: Enabled and even try to unmap blocks if possible. This requires
#         also that @BlockdevDiscardOptions is set to unmap for this device.
#
# Since: 2.1
##
{ 'enum': 'BlockdevDetectZeroesOptions',
  'data': [ 'off', 'on', 'unmap' ] }

##
# @BlockdevAioOptions:
#
# Selects the AIO backend to handle I/O requests
#
# @threads: Use qemu's thread pool
# @native: Use native AIO backend (only Linux and Windows)
# @io_uring: Use linux io_uring (since 5.0)
#
# Since: 2.9
##
{ 'enum': 'BlockdevAioOptions',
  'data': [ 'threads', 'native',
            { 'name': 'io_uring', 'if': 'defined(CONFIG_LINUX_IO_URING)' } ] }

##
# @BlockdevCacheOptions:
#
# Includes cache-related options for block devices
#
# @direct: enables use of O_DIRECT (bypass the host page cache;
#          default: false)
# @no-flush: ignore any flush requests for the device (default:
#            false)
#
# Since: 2.9
##
{ 'struct': 'BlockdevCacheOptions',
  'data': { '*direct': 'bool',
            '*no-flush': 'bool' } }

##
# @BlockdevDriver:
#
# Drivers that are supported in block device operations.
#
# @vxhs: Since 2.10
# @throttle: Since 2.11
# @nvme: Since 2.12
# @copy-on-read: Since 3.0
# @blklogwrites: Since 3.0
# @blkreplay: Since 4.2
# @compress: Since 5.0
#
# Since: 2.9
##
{ 'enum': 'BlockdevDriver',
  'data': [ 'blkdebug', 'blklogwrites', 'blkreplay', 'blkverify', 'bochs',
            'cloop', 'compress', 'copy-on-read', 'dmg', 'file', 'ftp', 'ftps',
            'gluster', 'host_cdrom', 'host_device', 'http', 'https', 'iscsi',
            'luks', 'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels',
            'qcow', 'qcow2', 'qed', 'quorum', 'raw', 'rbd',
            { 'name': 'replication', 'if': 'defined(CONFIG_REPLICATION)' },
            'sheepdog',
            'ssh', 'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat', 'vxhs' ] }

##
# @BlockdevOptionsFile:
#
# Driver specific block device options for the file backend.
#
# @filename: path to the image file
# @pr-manager: the id for the object that will handle persistent reservations
#              for this device (default: none, forward the commands via SG_IO;
#              since 2.11)
# @aio: AIO backend (default: threads) (since: 2.8)
# @locking: whether to enable file locking. If set to 'auto', only enable
#           when Open File Descriptor (OFD) locking API is available
#           (default: auto, since 2.10)
# @drop-cache: invalidate page cache during live migration.  This prevents
#              stale data on the migration destination with cache.direct=off.
#              Currently only supported on Linux hosts.
#              (default: on, since: 4.0)
# @x-check-cache-dropped: whether to check that page cache was dropped on live
#                         migration.  May cause noticeable delays if the image
#                         file is large, do not use in production.
#                         (default: off) (since: 3.0)
#
# Features:
# @dynamic-auto-read-only: If present, enabled auto-read-only means that the
#                          driver will open the image read-only at first,
#                          dynamically reopen the image file read-write when
#                          the first writer is attached to the node and reopen
#                          read-only when the last writer is detached. This
#                          allows giving QEMU write permissions only on demand
#                          when an operation actually needs write access.
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsFile',
  'data': { 'filename': 'str',
            '*pr-manager': 'str',
            '*locking': 'OnOffAuto',
            '*aio': 'BlockdevAioOptions',
            '*drop-cache': {'type': 'bool',
                            'if': 'defined(CONFIG_LINUX)'},
            '*x-check-cache-dropped': 'bool' },
  'features': [ { 'name': 'dynamic-auto-read-only',
                  'if': 'defined(CONFIG_POSIX)' } ] }

##
# @BlockdevOptionsNull:
#
# Driver specific block device options for the null backend.
#
# @size: size of the device in bytes.
# @latency-ns: emulated latency (in nanoseconds) in processing
#              requests. Default to zero which completes requests immediately.
#              (Since 2.4)
# @read-zeroes: if true, reads from the device produce zeroes; if false, the
#               buffer is left unchanged. (default: false; since: 4.1)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsNull',
  'data': { '*size': 'int', '*latency-ns': 'uint64', '*read-zeroes': 'bool' } }

##
# @BlockdevOptionsNVMe:
#
# Driver specific block device options for the NVMe backend.
#
# @device: PCI controller address of the NVMe device in
#          format hhhh:bb:ss.f (host:bus:slot.function)
# @namespace: namespace number of the device, starting from 1.
#
# Note that the PCI @device must have been unbound from any host
# kernel driver before instructing QEMU to add the blockdev.
#
# Since: 2.12
##
{ 'struct': 'BlockdevOptionsNVMe',
  'data': { 'device': 'str', 'namespace': 'int' } }

##
# @BlockdevOptionsVVFAT:
#
# Driver specific block device options for the vvfat protocol.
#
# @dir: directory to be exported as FAT image
# @fat-type: FAT type: 12, 16 or 32
# @floppy: whether to export a floppy image (true) or
#          partitioned hard disk (false; default)
# @label: set the volume label, limited to 11 bytes. FAT16 and
#         FAT32 traditionally have some restrictions on labels, which are
#         ignored by most operating systems. Defaults to "QEMU VVFAT".
#         (since 2.4)
# @rw: whether to allow write operations (default: false)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsVVFAT',
  'data': { 'dir': 'str', '*fat-type': 'int', '*floppy': 'bool',
            '*label': 'str', '*rw': 'bool' } }

##
# @BlockdevOptionsGenericFormat:
#
# Driver specific block device options for image format that have no option
# besides their data source.
#
# @file: reference to or definition of the data source block device
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsGenericFormat',
  'data': { 'file': 'BlockdevRef' } }

##
# @BlockdevOptionsLUKS:
#
# Driver specific block device options for LUKS.
#
# @key-secret: the ID of a QCryptoSecret object providing
#              the decryption key (since 2.6). Mandatory except when
#              doing a metadata-only probe of the image.
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsLUKS',
  'base': 'BlockdevOptionsGenericFormat',
  'data': { '*key-secret': 'str' } }


##
# @BlockdevOptionsGenericCOWFormat:
#
# Driver specific block device options for image format that have no option
# besides their data source and an optional backing file.
#
# @backing: reference to or definition of the backing file block
#           device, null disables the backing file entirely.
#           Defaults to the backing file stored the image file.
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsGenericCOWFormat',
  'base': 'BlockdevOptionsGenericFormat',
  'data': { '*backing': 'BlockdevRefOrNull' } }

##
# @Qcow2OverlapCheckMode:
#
# General overlap check modes.
#
# @none: Do not perform any checks
#
# @constant: Perform only checks which can be done in constant time and
#            without reading anything from disk
#
# @cached: Perform only checks which can be done without reading anything
#          from disk
#
# @all: Perform all available overlap checks
#
# Since: 2.9
##
{ 'enum': 'Qcow2OverlapCheckMode',
  'data': [ 'none', 'constant', 'cached', 'all' ] }

##
# @Qcow2OverlapCheckFlags:
#
# Structure of flags for each metadata structure. Setting a field to 'true'
# makes qemu guard that structure against unintended overwriting. The default
# value is chosen according to the template given.
#
# @template: Specifies a template mode which can be adjusted using the other
#            flags, defaults to 'cached'
#
# @bitmap-directory: since 3.0
#
# Since: 2.9
##
{ 'struct': 'Qcow2OverlapCheckFlags',
  'data': { '*template':         'Qcow2OverlapCheckMode',
            '*main-header':      'bool',
            '*active-l1':        'bool',
            '*active-l2':        'bool',
            '*refcount-table':   'bool',
            '*refcount-block':   'bool',
            '*snapshot-table':   'bool',
            '*inactive-l1':      'bool',
            '*inactive-l2':      'bool',
            '*bitmap-directory': 'bool' } }

##
# @Qcow2OverlapChecks:
#
# Specifies which metadata structures should be guarded against unintended
# overwriting.
#
# @flags: set of flags for separate specification of each metadata structure
#         type
#
# @mode: named mode which chooses a specific set of flags
#
# Since: 2.9
##
{ 'alternate': 'Qcow2OverlapChecks',
  'data': { 'flags': 'Qcow2OverlapCheckFlags',
            'mode':  'Qcow2OverlapCheckMode' } }

##
# @BlockdevQcowEncryptionFormat:
#
# @aes: AES-CBC with plain64 initialization vectors
#
# Since: 2.10
##
{ 'enum': 'BlockdevQcowEncryptionFormat',
  'data': [ 'aes' ] }

##
# @BlockdevQcowEncryption:
#
# Since: 2.10
##
{ 'union': 'BlockdevQcowEncryption',
  'base': { 'format': 'BlockdevQcowEncryptionFormat' },
  'discriminator': 'format',
  'data': { 'aes': 'QCryptoBlockOptionsQCow' } }

##
# @BlockdevOptionsQcow:
#
# Driver specific block device options for qcow.
#
# @encrypt: Image decryption options. Mandatory for
#           encrypted images, except when doing a metadata-only
#           probe of the image.
#
# Since: 2.10
##
{ 'struct': 'BlockdevOptionsQcow',
  'base': 'BlockdevOptionsGenericCOWFormat',
  'data': { '*encrypt': 'BlockdevQcowEncryption' } }



##
# @BlockdevQcow2EncryptionFormat:
# @aes: AES-CBC with plain64 initialization vectors
#
# Since: 2.10
##
{ 'enum': 'BlockdevQcow2EncryptionFormat',
  'data': [ 'aes', 'luks' ] }

##
# @BlockdevQcow2Encryption:
#
# Since: 2.10
##
{ 'union': 'BlockdevQcow2Encryption',
  'base': { 'format': 'BlockdevQcow2EncryptionFormat' },
  'discriminator': 'format',
  'data': { 'aes': 'QCryptoBlockOptionsQCow',
            'luks': 'QCryptoBlockOptionsLUKS'} }

##
# @BlockdevOptionsQcow2:
#
# Driver specific block device options for qcow2.
#
# @lazy-refcounts: whether to enable the lazy refcounts
#                  feature (default is taken from the image file)
#
# @pass-discard-request: whether discard requests to the qcow2
#                        device should be forwarded to the data source
#
# @pass-discard-snapshot: whether discard requests for the data source
#                         should be issued when a snapshot operation (e.g.
#                         deleting a snapshot) frees clusters in the qcow2 file
#
# @pass-discard-other: whether discard requests for the data source
#                      should be issued on other occasions where a cluster
#                      gets freed
#
# @overlap-check: which overlap checks to perform for writes
#                 to the image, defaults to 'cached' (since 2.2)
#
# @cache-size: the maximum total size of the L2 table and
#              refcount block caches in bytes (since 2.2)
#
# @l2-cache-size: the maximum size of the L2 table cache in
#                 bytes (since 2.2)
#
# @l2-cache-entry-size: the size of each entry in the L2 cache in
#                       bytes. It must be a power of two between 512
#                       and the cluster size. The default value is
#                       the cluster size (since 2.12)
#
# @refcount-cache-size: the maximum size of the refcount block cache
#                       in bytes (since 2.2)
#
# @cache-clean-interval: clean unused entries in the L2 and refcount
#                        caches. The interval is in seconds. The default value
#                        is 600 on supporting platforms, and 0 on other
#                        platforms. 0 disables this feature. (since 2.5)
#
# @encrypt: Image decryption options. Mandatory for
#           encrypted images, except when doing a metadata-only
#           probe of the image. (since 2.10)
#
# @data-file: reference to or definition of the external data file.
#             This may only be specified for images that require an
#             external data file. If it is not specified for such
#             an image, the data file name is loaded from the image
#             file. (since 4.0)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsQcow2',
  'base': 'BlockdevOptionsGenericCOWFormat',
  'data': { '*lazy-refcounts': 'bool',
            '*pass-discard-request': 'bool',
            '*pass-discard-snapshot': 'bool',
            '*pass-discard-other': 'bool',
            '*overlap-check': 'Qcow2OverlapChecks',
            '*cache-size': 'int',
            '*l2-cache-size': 'int',
            '*l2-cache-entry-size': 'int',
            '*refcount-cache-size': 'int',
            '*cache-clean-interval': 'int',
            '*encrypt': 'BlockdevQcow2Encryption',
            '*data-file': 'BlockdevRef' } }

##
# @SshHostKeyCheckMode:
#
# @none: Don't check the host key at all
# @hash: Compare the host key with a given hash
# @known_hosts: Check the host key against the known_hosts file
#
# Since: 2.12
##
{ 'enum': 'SshHostKeyCheckMode',
  'data': [ 'none', 'hash', 'known_hosts' ] }

##
# @SshHostKeyCheckHashType:
#
# @md5: The given hash is an md5 hash
# @sha1: The given hash is an sha1 hash
#
# Since: 2.12
##
{ 'enum': 'SshHostKeyCheckHashType',
  'data': [ 'md5', 'sha1' ] }

##
# @SshHostKeyHash:
#
# @type: The hash algorithm used for the hash
# @hash: The expected hash value
#
# Since: 2.12
##
{ 'struct': 'SshHostKeyHash',
  'data': { 'type': 'SshHostKeyCheckHashType',
            'hash': 'str' }}

##
# @SshHostKeyCheck:
#
# Since: 2.12
##
{ 'union': 'SshHostKeyCheck',
  'base': { 'mode': 'SshHostKeyCheckMode' },
  'discriminator': 'mode',
  'data': { 'hash': 'SshHostKeyHash' } }

##
# @BlockdevOptionsSsh:
#
# @server:              host address
#
# @path:                path to the image on the host
#
# @user:                user as which to connect, defaults to current
#                       local user name
#
# @host-key-check:      Defines how and what to check the host key against
#                       (default: known_hosts)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsSsh',
  'data': { 'server': 'InetSocketAddress',
            'path': 'str',
            '*user': 'str',
            '*host-key-check': 'SshHostKeyCheck' } }


##
# @BlkdebugEvent:
#
# Trigger events supported by blkdebug.
#
# @l1_shrink_write_table: write zeros to the l1 table to shrink image.
#                         (since 2.11)
#
# @l1_shrink_free_l2_clusters: discard the l2 tables. (since 2.11)
#
# @cor_write: a write due to copy-on-read (since 2.11)
#
# @cluster_alloc_space: an allocation of file space for a cluster (since 4.1)
#
# @none: triggers once at creation of the blkdebug node (since 4.1)
#
# Since: 2.9
##
{ 'enum': 'BlkdebugEvent', 'prefix': 'BLKDBG',
  'data': [ 'l1_update', 'l1_grow_alloc_table', 'l1_grow_write_table',
            'l1_grow_activate_table', 'l2_load', 'l2_update',
            'l2_update_compressed', 'l2_alloc_cow_read', 'l2_alloc_write',
            'read_aio', 'read_backing_aio', 'read_compressed', 'write_aio',
            'write_compressed', 'vmstate_load', 'vmstate_save', 'cow_read',
            'cow_write', 'reftable_load', 'reftable_grow', 'reftable_update',
            'refblock_load', 'refblock_update', 'refblock_update_part',
            'refblock_alloc', 'refblock_alloc_hookup', 'refblock_alloc_write',
            'refblock_alloc_write_blocks', 'refblock_alloc_write_table',
            'refblock_alloc_switch_table', 'cluster_alloc',
            'cluster_alloc_bytes', 'cluster_free', 'flush_to_os',
            'flush_to_disk', 'pwritev_rmw_head', 'pwritev_rmw_after_head',
            'pwritev_rmw_tail', 'pwritev_rmw_after_tail', 'pwritev',
            'pwritev_zero', 'pwritev_done', 'empty_image_prepare',
            'l1_shrink_write_table', 'l1_shrink_free_l2_clusters',
            'cor_write', 'cluster_alloc_space', 'none'] }

##
# @BlkdebugIOType:
#
# Kinds of I/O that blkdebug can inject errors in.
#
# @read: .bdrv_co_preadv()
#
# @write: .bdrv_co_pwritev()
#
# @write-zeroes: .bdrv_co_pwrite_zeroes()
#
# @discard: .bdrv_co_pdiscard()
#
# @flush: .bdrv_co_flush_to_disk()
#
# @block-status: .bdrv_co_block_status()
#
# Since: 4.1
##
{ 'enum': 'BlkdebugIOType', 'prefix': 'BLKDEBUG_IO_TYPE',
  'data': [ 'read', 'write', 'write-zeroes', 'discard', 'flush',
            'block-status' ] }

##
# @BlkdebugInjectErrorOptions:
#
# Describes a single error injection for blkdebug.
#
# @event: trigger event
#
# @state: the state identifier blkdebug needs to be in to
#         actually trigger the event; defaults to "any"
#
# @iotype: the type of I/O operations on which this error should
#          be injected; defaults to "all read, write,
#          write-zeroes, discard, and flush operations"
#          (since: 4.1)
#
# @errno: error identifier (errno) to be returned; defaults to
#         EIO
#
# @sector: specifies the sector index which has to be affected
#          in order to actually trigger the event; defaults to "any
#          sector"
#
# @once: disables further events after this one has been
#        triggered; defaults to false
#
# @immediately: fail immediately; defaults to false
#
# Since: 2.9
##
{ 'struct': 'BlkdebugInjectErrorOptions',
  'data': { 'event': 'BlkdebugEvent',
            '*state': 'int',
            '*iotype': 'BlkdebugIOType',
            '*errno': 'int',
            '*sector': 'int',
            '*once': 'bool',
            '*immediately': 'bool' } }

##
# @BlkdebugSetStateOptions:
#
# Describes a single state-change event for blkdebug.
#
# @event: trigger event
#
# @state: the current state identifier blkdebug needs to be in;
#         defaults to "any"
#
# @new_state: the state identifier blkdebug is supposed to assume if
#             this event is triggered
#
# Since: 2.9
##
{ 'struct': 'BlkdebugSetStateOptions',
  'data': { 'event': 'BlkdebugEvent',
            '*state': 'int',
            'new_state': 'int' } }

##
# @BlockdevOptionsBlkdebug:
#
# Driver specific block device options for blkdebug.
#
# @image: underlying raw block device (or image file)
#
# @config: filename of the configuration file
#
# @align: required alignment for requests in bytes, must be
#         positive power of 2, or 0 for default
#
# @max-transfer: maximum size for I/O transfers in bytes, must be
#                positive multiple of @align and of the underlying
#                file's request alignment (but need not be a power of
#                2), or 0 for default (since 2.10)
#
# @opt-write-zero: preferred alignment for write zero requests in bytes,
#                  must be positive multiple of @align and of the
#                  underlying file's request alignment (but need not be a
#                  power of 2), or 0 for default (since 2.10)
#
# @max-write-zero: maximum size for write zero requests in bytes, must be
#                  positive multiple of @align, of @opt-write-zero, and of
#                  the underlying file's request alignment (but need not
#                  be a power of 2), or 0 for default (since 2.10)
#
# @opt-discard: preferred alignment for discard requests in bytes, must
#               be positive multiple of @align and of the underlying
#               file's request alignment (but need not be a power of
#               2), or 0 for default (since 2.10)
#
# @max-discard: maximum size for discard requests in bytes, must be
#               positive multiple of @align, of @opt-discard, and of
#               the underlying file's request alignment (but need not
#               be a power of 2), or 0 for default (since 2.10)
#
# @inject-error: array of error injection descriptions
#
# @set-state: array of state-change descriptions
#
# @take-child-perms: Permissions to take on @image in addition to what
#                    is necessary anyway (which depends on how the
#                    blkdebug node is used).  Defaults to none.
#                    (since 5.0)
#
# @unshare-child-perms: Permissions not to share on @image in addition
#                       to what cannot be shared anyway (which depends
#                       on how the blkdebug node is used).  Defaults
#                       to none.  (since 5.0)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsBlkdebug',
  'data': { 'image': 'BlockdevRef',
            '*config': 'str',
            '*align': 'int', '*max-transfer': 'int32',
            '*opt-write-zero': 'int32', '*max-write-zero': 'int32',
            '*opt-discard': 'int32', '*max-discard': 'int32',
            '*inject-error': ['BlkdebugInjectErrorOptions'],
            '*set-state': ['BlkdebugSetStateOptions'],
            '*take-child-perms': ['BlockPermission'],
            '*unshare-child-perms': ['BlockPermission'] } }

##
# @BlockdevOptionsBlklogwrites:
#
# Driver specific block device options for blklogwrites.
#
# @file: block device
#
# @log: block device used to log writes to @file
#
# @log-sector-size: sector size used in logging writes to @file, determines
#                   granularity of offsets and sizes of writes (default: 512)
#
# @log-append: append to an existing log (default: false)
#
# @log-super-update-interval: interval of write requests after which the log
#                             super block is updated to disk (default: 4096)
#
# Since: 3.0
##
{ 'struct': 'BlockdevOptionsBlklogwrites',
  'data': { 'file': 'BlockdevRef',
            'log': 'BlockdevRef',
            '*log-sector-size': 'uint32',
            '*log-append': 'bool',
            '*log-super-update-interval': 'uint64' } }

##
# @BlockdevOptionsBlkverify:
#
# Driver specific block device options for blkverify.
#
# @test: block device to be tested
#
# @raw: raw image used for verification
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsBlkverify',
  'data': { 'test': 'BlockdevRef',
            'raw': 'BlockdevRef' } }

##
# @BlockdevOptionsBlkreplay:
#
# Driver specific block device options for blkreplay.
#
# @image: disk image which should be controlled with blkreplay
#
# Since: 4.2
##
{ 'struct': 'BlockdevOptionsBlkreplay',
  'data': { 'image': 'BlockdevRef' } }

##
# @QuorumReadPattern:
#
# An enumeration of quorum read patterns.
#
# @quorum: read all the children and do a quorum vote on reads
#
# @fifo: read only from the first child that has not failed
#
# Since: 2.9
##
{ 'enum': 'QuorumReadPattern', 'data': [ 'quorum', 'fifo' ] }

##
# @BlockdevOptionsQuorum:
#
# Driver specific block device options for Quorum
#
# @blkverify: true if the driver must print content mismatch
#                  set to false by default
#
# @children: the children block devices to use
#
# @vote-threshold: the vote limit under which a read will fail
#
# @rewrite-corrupted: rewrite corrupted data when quorum is reached
#                     (Since 2.1)
#
# @read-pattern: choose read pattern and set to quorum by default
#                (Since 2.2)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsQuorum',
  'data': { '*blkverify': 'bool',
            'children': [ 'BlockdevRef' ],
            'vote-threshold': 'int',
            '*rewrite-corrupted': 'bool',
            '*read-pattern': 'QuorumReadPattern' } }

##
# @BlockdevOptionsGluster:
#
# Driver specific block device options for Gluster
#
# @volume: name of gluster volume where VM image resides
#
# @path: absolute path to image file in gluster volume
#
# @server: gluster servers description
#
# @debug: libgfapi log level (default '4' which is Error)
#         (Since 2.8)
#
# @logfile: libgfapi log file (default /dev/stderr) (Since 2.8)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsGluster',
  'data': { 'volume': 'str',
            'path': 'str',
            'server': ['SocketAddress'],
            '*debug': 'int',
            '*logfile': 'str' } }

##
# @IscsiTransport:
#
# An enumeration of libiscsi transport types
#
# Since: 2.9
##
{ 'enum': 'IscsiTransport',
  'data': [ 'tcp', 'iser' ] }

##
# @IscsiHeaderDigest:
#
# An enumeration of header digests supported by libiscsi
#
# Since: 2.9
##
{ 'enum': 'IscsiHeaderDigest',
  'prefix': 'QAPI_ISCSI_HEADER_DIGEST',
  'data': [ 'crc32c', 'none', 'crc32c-none', 'none-crc32c' ] }

##
# @BlockdevOptionsIscsi:
#
# @transport: The iscsi transport type
#
# @portal: The address of the iscsi portal
#
# @target: The target iqn name
#
# @lun: LUN to connect to. Defaults to 0.
#
# @user: User name to log in with. If omitted, no CHAP
#        authentication is performed.
#
# @password-secret: The ID of a QCryptoSecret object providing
#                   the password for the login. This option is required if
#                   @user is specified.
#
# @initiator-name: The iqn name we want to identify to the target
#                  as. If this option is not specified, an initiator name is
#                  generated automatically.
#
# @header-digest: The desired header digest. Defaults to
#                 none-crc32c.
#
# @timeout: Timeout in seconds after which a request will
#           timeout. 0 means no timeout and is the default.
#
# Driver specific block device options for iscsi
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsIscsi',
  'data': { 'transport': 'IscsiTransport',
            'portal': 'str',
            'target': 'str',
            '*lun': 'int',
            '*user': 'str',
            '*password-secret': 'str',
            '*initiator-name': 'str',
            '*header-digest': 'IscsiHeaderDigest',
            '*timeout': 'int' } }


##
# @RbdAuthMode:
#
# Since: 3.0
##
{ 'enum': 'RbdAuthMode',
  'data': [ 'cephx', 'none' ] }

##
# @BlockdevOptionsRbd:
#
# @pool: Ceph pool name.
#
# @namespace: Rados namespace name in the Ceph pool. (Since 5.0)
#
# @image: Image name in the Ceph pool.
#
# @conf: path to Ceph configuration file.  Values
#        in the configuration file will be overridden by
#        options specified via QAPI.
#
# @snapshot: Ceph snapshot name.
#
# @user: Ceph id name.
#
# @auth-client-required: Acceptable authentication modes.
#                        This maps to Ceph configuration option
#                        "auth_client_required".  (Since 3.0)
#
# @key-secret: ID of a QCryptoSecret object providing a key
#              for cephx authentication.
#              This maps to Ceph configuration option
#              "key".  (Since 3.0)
#
# @server: Monitor host address and port.  This maps
#          to the "mon_host" Ceph option.
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsRbd',
  'data': { 'pool': 'str',
            '*namespace': 'str',
            'image': 'str',
            '*conf': 'str',
            '*snapshot': 'str',
            '*user': 'str',
            '*auth-client-required': ['RbdAuthMode'],
            '*key-secret': 'str',
            '*server': ['InetSocketAddressBase'] } }

##
# @BlockdevOptionsSheepdog:
#
# Driver specific block device options for sheepdog
#
# @vdi: Virtual disk image name
# @server: The Sheepdog server to connect to
# @snap-id: Snapshot ID
# @tag: Snapshot tag name
#
# Only one of @snap-id and @tag may be present.
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsSheepdog',
  'data': { 'server': 'SocketAddress',
            'vdi': 'str',
            '*snap-id': 'uint32',
            '*tag': 'str' } }

##
# @ReplicationMode:
#
# An enumeration of replication modes.
#
# @primary: Primary mode, the vm's state will be sent to secondary QEMU.
#
# @secondary: Secondary mode, receive the vm's state from primary QEMU.
#
# Since: 2.9
##
{ 'enum' : 'ReplicationMode', 'data' : [ 'primary', 'secondary' ],
  'if': 'defined(CONFIG_REPLICATION)' }

##
# @BlockdevOptionsReplication:
#
# Driver specific block device options for replication
#
# @mode: the replication mode
#
# @top-id: In secondary mode, node name or device ID of the root
#          node who owns the replication node chain. Must not be given in
#          primary mode.
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsReplication',
  'base': 'BlockdevOptionsGenericFormat',
  'data': { 'mode': 'ReplicationMode',
            '*top-id': 'str' },
  'if': 'defined(CONFIG_REPLICATION)' }

##
# @NFSTransport:
#
# An enumeration of NFS transport types
#
# @inet: TCP transport
#
# Since: 2.9
##
{ 'enum': 'NFSTransport',
  'data': [ 'inet' ] }

##
# @NFSServer:
#
# Captures the address of the socket
#
# @type: transport type used for NFS (only TCP supported)
#
# @host: host address for NFS server
#
# Since: 2.9
##
{ 'struct': 'NFSServer',
  'data': { 'type': 'NFSTransport',
            'host': 'str' } }

##
# @BlockdevOptionsNfs:
#
# Driver specific block device option for NFS
#
# @server: host address
#
# @path: path of the image on the host
#
# @user: UID value to use when talking to the
#        server (defaults to 65534 on Windows and getuid()
#        on unix)
#
# @group: GID value to use when talking to the
#         server (defaults to 65534 on Windows and getgid()
#         in unix)
#
# @tcp-syn-count: number of SYNs during the session
#                 establishment (defaults to libnfs default)
#
# @readahead-size: set the readahead size in bytes (defaults
#                  to libnfs default)
#
# @page-cache-size: set the pagecache size in bytes (defaults
#                   to libnfs default)
#
# @debug: set the NFS debug level (max 2) (defaults
#         to libnfs default)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsNfs',
  'data': { 'server': 'NFSServer',
            'path': 'str',
            '*user': 'int',
            '*group': 'int',
            '*tcp-syn-count': 'int',
            '*readahead-size': 'int',
            '*page-cache-size': 'int',
            '*debug': 'int' } }

##
# @BlockdevOptionsCurlBase:
#
# Driver specific block device options shared by all protocols supported by the
# curl backend.
#
# @url: URL of the image file
#
# @readahead: Size of the read-ahead cache; must be a multiple of
#             512 (defaults to 256 kB)
#
# @timeout: Timeout for connections, in seconds (defaults to 5)
#
# @username: Username for authentication (defaults to none)
#
# @password-secret: ID of a QCryptoSecret object providing a password
#                   for authentication (defaults to no password)
#
# @proxy-username: Username for proxy authentication (defaults to none)
#
# @proxy-password-secret: ID of a QCryptoSecret object providing a password
#                         for proxy authentication (defaults to no password)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsCurlBase',
  'data': { 'url': 'str',
            '*readahead': 'int',
            '*timeout': 'int',
            '*username': 'str',
            '*password-secret': 'str',
            '*proxy-username': 'str',
            '*proxy-password-secret': 'str' } }

##
# @BlockdevOptionsCurlHttp:
#
# Driver specific block device options for HTTP connections over the curl
# backend.  URLs must start with "http://".
#
# @cookie: List of cookies to set; format is
#          "name1=content1; name2=content2;" as explained by
#          CURLOPT_COOKIE(3). Defaults to no cookies.
#
# @cookie-secret: ID of a QCryptoSecret object providing the cookie data in a
#                 secure way. See @cookie for the format. (since 2.10)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsCurlHttp',
  'base': 'BlockdevOptionsCurlBase',
  'data': { '*cookie': 'str',
            '*cookie-secret': 'str'} }

##
# @BlockdevOptionsCurlHttps:
#
# Driver specific block device options for HTTPS connections over the curl
# backend.  URLs must start with "https://".
#
# @cookie: List of cookies to set; format is
#          "name1=content1; name2=content2;" as explained by
#          CURLOPT_COOKIE(3). Defaults to no cookies.
#
# @sslverify: Whether to verify the SSL certificate's validity (defaults to
#             true)
#
# @cookie-secret: ID of a QCryptoSecret object providing the cookie data in a
#                 secure way. See @cookie for the format. (since 2.10)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsCurlHttps',
  'base': 'BlockdevOptionsCurlBase',
  'data': { '*cookie': 'str',
            '*sslverify': 'bool',
            '*cookie-secret': 'str'} }

##
# @BlockdevOptionsCurlFtp:
#
# Driver specific block device options for FTP connections over the curl
# backend.  URLs must start with "ftp://".
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsCurlFtp',
  'base': 'BlockdevOptionsCurlBase',
  'data': { } }

##
# @BlockdevOptionsCurlFtps:
#
# Driver specific block device options for FTPS connections over the curl
# backend.  URLs must start with "ftps://".
#
# @sslverify: Whether to verify the SSL certificate's validity (defaults to
#             true)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsCurlFtps',
  'base': 'BlockdevOptionsCurlBase',
  'data': { '*sslverify': 'bool' } }

##
# @BlockdevOptionsNbd:
#
# Driver specific block device options for NBD.
#
# @server: NBD server address
#
# @export: export name
#
# @tls-creds: TLS credentials ID
#
# @x-dirty-bitmap: A "qemu:dirty-bitmap:NAME" string to query in place of
#                  traditional "base:allocation" block status (see
#                  NBD_OPT_LIST_META_CONTEXT in the NBD protocol) (since 3.0)
#
# @reconnect-delay: On an unexpected disconnect, the nbd client tries to
#                   connect again until succeeding or encountering a serious
#                   error.  During the first @reconnect-delay seconds, all
#                   requests are paused and will be rerun on a successful
#                   reconnect. After that time, any delayed requests and all
#                   future requests before a successful reconnect will
#                   immediately fail. Default 0 (Since 4.2)
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsNbd',
  'data': { 'server': 'SocketAddress',
            '*export': 'str',
            '*tls-creds': 'str',
            '*x-dirty-bitmap': 'str',
            '*reconnect-delay': 'uint32' } }

##
# @BlockdevOptionsRaw:
#
# Driver specific block device options for the raw driver.
#
# @offset: position where the block device starts
# @size: the assumed size of the device
#
# Since: 2.9
##
{ 'struct': 'BlockdevOptionsRaw',
  'base': 'BlockdevOptionsGenericFormat',
  'data': { '*offset': 'int', '*size': 'int' } }

##
# @BlockdevOptionsVxHS:
#
# Driver specific block device options for VxHS
#
# @vdisk-id: UUID of VxHS volume
# @server: vxhs server IP, port
# @tls-creds: TLS credentials ID
#
# Since: 2.10
##
{ 'struct': 'BlockdevOptionsVxHS',
  'data': { 'vdisk-id': 'str',
            'server': 'InetSocketAddressBase',
            '*tls-creds': 'str' } }

##
# @BlockdevOptionsThrottle:
#
# Driver specific block device options for the throttle driver
#
# @throttle-group: the name of the throttle-group object to use. It
#                  must already exist.
# @file: reference to or definition of the data source block device
# Since: 2.11
##
{ 'struct': 'BlockdevOptionsThrottle',
  'data': { 'throttle-group': 'str',
            'file' : 'BlockdevRef'
             } }
##
# @BlockdevOptions:
#
# Options for creating a block device.  Many options are available for all
# block devices, independent of the block driver:
#
# @driver: block driver name
# @node-name: the node name of the new node (Since 2.0).
#             This option is required on the top level of blockdev-add.
#             Valid node names start with an alphabetic character and may
#             contain only alphanumeric characters, '-', '.' and '_'. Their
#             maximum length is 31 characters.
# @discard: discard-related options (default: ignore)
# @cache: cache-related options
# @read-only: whether the block device should be read-only (default: false).
#             Note that some block drivers support only read-only access,
#             either generally or in certain configurations. In this case,
#             the default value does not work and the option must be
#             specified explicitly.
# @auto-read-only: if true and @read-only is false, QEMU may automatically
#                  decide not to open the image read-write as requested, but
#                  fall back to read-only instead (and switch between the modes
#                  later), e.g. depending on whether the image file is writable
#                  or whether a writing user is attached to the node
#                  (default: false, since 3.1)
# @detect-zeroes: detect and optimize zero writes (Since 2.1)
#                 (default: off)
# @force-share: force share all permission on added nodes.
#               Requires read-only=true. (Since 2.10)
#
# Remaining options are determined by the block driver.
#
# Since: 2.9
##
{ 'union': 'BlockdevOptions',
  'base': { 'driver': 'BlockdevDriver',
            '*node-name': 'str',
            '*discard': 'BlockdevDiscardOptions',
            '*cache': 'BlockdevCacheOptions',
            '*read-only': 'bool',
            '*auto-read-only': 'bool',
            '*force-share': 'bool',
            '*detect-zeroes': 'BlockdevDetectZeroesOptions' },
  'discriminator': 'driver',
  'data': {
      'blkdebug':   'BlockdevOptionsBlkdebug',
      'blklogwrites':'BlockdevOptionsBlklogwrites',
      'blkverify':  'BlockdevOptionsBlkverify',
      'blkreplay':  'BlockdevOptionsBlkreplay',
      'bochs':      'BlockdevOptionsGenericFormat',
      'cloop':      'BlockdevOptionsGenericFormat',
      'compress':   'BlockdevOptionsGenericFormat',
      'copy-on-read':'BlockdevOptionsGenericFormat',
      'dmg':        'BlockdevOptionsGenericFormat',
      'file':       'BlockdevOptionsFile',
      'ftp':        'BlockdevOptionsCurlFtp',
      'ftps':       'BlockdevOptionsCurlFtps',
      'gluster':    'BlockdevOptionsGluster',
      'host_cdrom': 'BlockdevOptionsFile',
      'host_device':'BlockdevOptionsFile',
      'http':       'BlockdevOptionsCurlHttp',
      'https':      'BlockdevOptionsCurlHttps',
      'iscsi':      'BlockdevOptionsIscsi',
      'luks':       'BlockdevOptionsLUKS',
      'nbd':        'BlockdevOptionsNbd',
      'nfs':        'BlockdevOptionsNfs',
      'null-aio':   'BlockdevOptionsNull',
      'null-co':    'BlockdevOptionsNull',
      'nvme':       'BlockdevOptionsNVMe',
      'parallels':  'BlockdevOptionsGenericFormat',
      'qcow2':      'BlockdevOptionsQcow2',
      'qcow':       'BlockdevOptionsQcow',
      'qed':        'BlockdevOptionsGenericCOWFormat',
      'quorum':     'BlockdevOptionsQuorum',
      'raw':        'BlockdevOptionsRaw',
      'rbd':        'BlockdevOptionsRbd',
      'replication': { 'type': 'BlockdevOptionsReplication',
                       'if': 'defined(CONFIG_REPLICATION)' },
      'sheepdog':   'BlockdevOptionsSheepdog',
      'ssh':        'BlockdevOptionsSsh',
      'throttle':   'BlockdevOptionsThrottle',
      'vdi':        'BlockdevOptionsGenericFormat',
      'vhdx':       'BlockdevOptionsGenericFormat',
      'vmdk':       'BlockdevOptionsGenericCOWFormat',
      'vpc':        'BlockdevOptionsGenericFormat',
      'vvfat':      'BlockdevOptionsVVFAT',
      'vxhs':       'BlockdevOptionsVxHS'
  } }

##
# @BlockdevRef:
#
# Reference to a block device.
#
# @definition: defines a new block device inline
# @reference: references the ID of an existing block device
#
# Since: 2.9
##
{ 'alternate': 'BlockdevRef',
  'data': { 'definition': 'BlockdevOptions',
            'reference': 'str' } }

##
# @BlockdevRefOrNull:
#
# Reference to a block device.
#
# @definition: defines a new block device inline
# @reference: references the ID of an existing block device.
#             An empty string means that no block device should
#             be referenced.  Deprecated; use null instead.
# @null: No block device should be referenced (since 2.10)
#
# Since: 2.9
##
{ 'alternate': 'BlockdevRefOrNull',
  'data': { 'definition': 'BlockdevOptions',
            'reference': 'str',
            'null': 'null' } }

##
# @blockdev-add:
#
# Creates a new block device. If the @id option is given at the top level, a
# BlockBackend will be created; otherwise, @node-name is mandatory at the top
# level and no BlockBackend will be created.
#
# Since: 2.9
#
# Example:
#
# 1.
# -> { "execute": "blockdev-add",
#      "arguments": {
#           "driver": "qcow2",
#           "node-name": "test1",
#           "file": {
#               "driver": "file",
#               "filename": "test.qcow2"
#            }
#       }
#     }
# <- { "return": {} }
#
# 2.
# -> { "execute": "blockdev-add",
#      "arguments": {
#           "driver": "qcow2",
#           "node-name": "node0",
#           "discard": "unmap",
#           "cache": {
#              "direct": true
#            },
#            "file": {
#              "driver": "file",
#              "filename": "/tmp/test.qcow2"
#            },
#            "backing": {
#               "driver": "raw",
#               "file": {
#                  "driver": "file",
#                  "filename": "/dev/fdset/4"
#                }
#            }
#        }
#      }
#
# <- { "return": {} }
#
##
{ 'command': 'blockdev-add', 'data': 'BlockdevOptions', 'boxed': true }

##
# @x-blockdev-reopen:
#
# Reopens a block device using the given set of options. Any option
# not specified will be reset to its default value regardless of its
# previous status. If an option cannot be changed or a particular
# driver does not support reopening then the command will return an
# error.
#
# The top-level @node-name option (from BlockdevOptions) must be
# specified and is used to select the block device to be reopened.
# Other @node-name options must be either omitted or set to the
# current name of the appropriate node. This command won't change any
# node name and any attempt to do it will result in an error.
#
# In the case of options that refer to child nodes, the behavior of
# this command depends on the value:
#
#  1) A set of options (BlockdevOptions): the child is reopened with
#     the specified set of options.
#
#  2) A reference to the current child: the child is reopened using
#     its existing set of options.
#
#  3) A reference to a different node: the current child is replaced
#     with the specified one.
#
#  4) NULL: the current child (if any) is detached.
#
# Options (1) and (2) are supported in all cases, but at the moment
# only @backing allows replacing or detaching an existing child.
#
# Unlike with blockdev-add, the @backing option must always be present
# unless the node being reopened does not have a backing file and its
# image does not have a default backing file name as part of its
# metadata.
#
# Since: 4.0
##
{ 'command': 'x-blockdev-reopen',
  'data': 'BlockdevOptions', 'boxed': true }

##
# @blockdev-del:
#
# Deletes a block device that has been added using blockdev-add.
# The command will fail if the node is attached to a device or is
# otherwise being used.
#
# @node-name: Name of the graph node to delete.
#
# Since: 2.9
#
# Example:
#
# -> { "execute": "blockdev-add",
#      "arguments": {
#           "driver": "qcow2",
#           "node-name": "node0",
#           "file": {
#               "driver": "file",
#               "filename": "test.qcow2"
#           }
#      }
#    }
# <- { "return": {} }
#
# -> { "execute": "blockdev-del",
#      "arguments": { "node-name": "node0" }
#    }
# <- { "return": {} }
#
##
{ 'command': 'blockdev-del', 'data': { 'node-name': 'str' } }

##
# @BlockdevCreateOptionsFile:
#
# Driver specific image creation options for file.
#
# @filename: Filename for the new image file
# @size: Size of the virtual disk in bytes
# @preallocation: Preallocation mode for the new image (default: off;
#                 allowed values: off,
#                 falloc (if defined CONFIG_POSIX_FALLOCATE),
#                 full (if defined CONFIG_POSIX))
# @nocow: Turn off copy-on-write (valid only on btrfs; default: off)
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsFile',
  'data': { 'filename':         'str',
            'size':             'size',
            '*preallocation':   'PreallocMode',
            '*nocow':           'bool' } }

##
# @BlockdevCreateOptionsGluster:
#
# Driver specific image creation options for gluster.
#
# @location: Where to store the new image file
# @size: Size of the virtual disk in bytes
# @preallocation: Preallocation mode for the new image (default: off;
#                 allowed values: off,
#                 falloc (if defined CONFIG_GLUSTERFS_FALLOCATE),
#                 full (if defined CONFIG_GLUSTERFS_ZEROFILL))
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsGluster',
  'data': { 'location':         'BlockdevOptionsGluster',
            'size':             'size',
            '*preallocation':   'PreallocMode' } }

##
# @BlockdevCreateOptionsLUKS:
#
# Driver specific image creation options for LUKS.
#
# @file: Node to create the image format on
# @size: Size of the virtual disk in bytes
# @preallocation: Preallocation mode for the new image
#                 (since: 4.2)
#                 (default: off; allowed values: off, metadata, falloc, full)
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsLUKS',
  'base': 'QCryptoBlockCreateOptionsLUKS',
  'data': { 'file':             'BlockdevRef',
            'size':             'size',
            '*preallocation':   'PreallocMode' } }

##
# @BlockdevCreateOptionsNfs:
#
# Driver specific image creation options for NFS.
#
# @location: Where to store the new image file
# @size: Size of the virtual disk in bytes
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsNfs',
  'data': { 'location':         'BlockdevOptionsNfs',
            'size':             'size' } }

##
# @BlockdevCreateOptionsParallels:
#
# Driver specific image creation options for parallels.
#
# @file: Node to create the image format on
# @size: Size of the virtual disk in bytes
# @cluster-size: Cluster size in bytes (default: 1 MB)
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsParallels',
  'data': { 'file':             'BlockdevRef',
            'size':             'size',
            '*cluster-size':    'size' } }

##
# @BlockdevCreateOptionsQcow:
#
# Driver specific image creation options for qcow.
#
# @file: Node to create the image format on
# @size: Size of the virtual disk in bytes
# @backing-file: File name of the backing file if a backing file
#                should be used
# @encrypt: Encryption options if the image should be encrypted
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsQcow',
  'data': { 'file':             'BlockdevRef',
            'size':             'size',
            '*backing-file':    'str',
            '*encrypt':         'QCryptoBlockCreateOptions' } }

##
# @BlockdevQcow2Version:
#
# @v2:  The original QCOW2 format as introduced in qemu 0.10 (version 2)
# @v3:  The extended QCOW2 format as introduced in qemu 1.1 (version 3)
#
# Since: 2.12
##
{ 'enum': 'BlockdevQcow2Version',
  'data': [ 'v2', 'v3' ] }


##
# @BlockdevCreateOptionsQcow2:
#
# Driver specific image creation options for qcow2.
#
# @file: Node to create the image format on
# @data-file: Node to use as an external data file in which all guest
#             data is stored so that only metadata remains in the qcow2
#             file (since: 4.0)
# @data-file-raw: True if the external data file must stay valid as a
#                 standalone (read-only) raw image without looking at qcow2
#                 metadata (default: false; since: 4.0)
# @size: Size of the virtual disk in bytes
# @version: Compatibility level (default: v3)
# @backing-file: File name of the backing file if a backing file
#                should be used
# @backing-fmt: Name of the block driver to use for the backing file
# @encrypt: Encryption options if the image should be encrypted
# @cluster-size: qcow2 cluster size in bytes (default: 65536)
# @preallocation: Preallocation mode for the new image (default: off;
#                 allowed values: off, falloc, full, metadata)
# @lazy-refcounts: True if refcounts may be updated lazily (default: off)
# @refcount-bits: Width of reference counts in bits (default: 16)
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsQcow2',
  'data': { 'file':             'BlockdevRef',
            '*data-file':       'BlockdevRef',
            '*data-file-raw':   'bool',
            'size':             'size',
            '*version':         'BlockdevQcow2Version',
            '*backing-file':    'str',
            '*backing-fmt':     'BlockdevDriver',
            '*encrypt':         'QCryptoBlockCreateOptions',
            '*cluster-size':    'size',
            '*preallocation':   'PreallocMode',
            '*lazy-refcounts':  'bool',
            '*refcount-bits':   'int' } }

##
# @BlockdevCreateOptionsQed:
#
# Driver specific image creation options for qed.
#
# @file: Node to create the image format on
# @size: Size of the virtual disk in bytes
# @backing-file: File name of the backing file if a backing file
#                should be used
# @backing-fmt: Name of the block driver to use for the backing file
# @cluster-size: Cluster size in bytes (default: 65536)
# @table-size: L1/L2 table size (in clusters)
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsQed',
  'data': { 'file':             'BlockdevRef',
            'size':             'size',
            '*backing-file':    'str',
            '*backing-fmt':     'BlockdevDriver',
            '*cluster-size':    'size',
            '*table-size':      'int' } }

##
# @BlockdevCreateOptionsRbd:
#
# Driver specific image creation options for rbd/Ceph.
#
# @location: Where to store the new image file. This location cannot
#            point to a snapshot.
# @size: Size of the virtual disk in bytes
# @cluster-size: RBD object size
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsRbd',
  'data': { 'location':         'BlockdevOptionsRbd',
            'size':             'size',
            '*cluster-size' :   'size' } }

##
# @BlockdevVmdkSubformat:
#
# Subformat options for VMDK images
#
# @monolithicSparse:     Single file image with sparse cluster allocation
#
# @monolithicFlat:       Single flat data image and a descriptor file
#
# @twoGbMaxExtentSparse: Data is split into 2GB (per virtual LBA) sparse extent
#                        files, in addition to a descriptor file
#
# @twoGbMaxExtentFlat:   Data is split into 2GB (per virtual LBA) flat extent
#                        files, in addition to a descriptor file
#
# @streamOptimized:      Single file image sparse cluster allocation, optimized
#                        for streaming over network.
#
# Since: 4.0
##
{ 'enum': 'BlockdevVmdkSubformat',
  'data': [ 'monolithicSparse', 'monolithicFlat', 'twoGbMaxExtentSparse',
            'twoGbMaxExtentFlat', 'streamOptimized'] }

##
# @BlockdevVmdkAdapterType:
#
# Adapter type info for VMDK images
#
# Since: 4.0
##
{ 'enum': 'BlockdevVmdkAdapterType',
  'data': [ 'ide', 'buslogic', 'lsilogic', 'legacyESX'] }

##
# @BlockdevCreateOptionsVmdk:
#
# Driver specific image creation options for VMDK.
#
# @file: Where to store the new image file. This refers to the image
#        file for monolithcSparse and streamOptimized format, or the
#        descriptor file for other formats.
# @size: Size of the virtual disk in bytes
# @extents: Where to store the data extents. Required for monolithcFlat,
#           twoGbMaxExtentSparse and twoGbMaxExtentFlat formats. For
#           monolithicFlat, only one entry is required; for
#           twoGbMaxExtent* formats, the number of entries required is
#           calculated as extent_number = virtual_size / 2GB. Providing
#           more extents than will be used is an error.
# @subformat: The subformat of the VMDK image. Default: "monolithicSparse".
# @backing-file: The path of backing file. Default: no backing file is used.
# @adapter-type: The adapter type used to fill in the descriptor. Default: ide.
# @hwversion: Hardware version. The meaningful options are "4" or "6".
#             Default: "4".
# @zeroed-grain: Whether to enable zeroed-grain feature for sparse subformats.
#                Default: false.
#
# Since: 4.0
##
{ 'struct': 'BlockdevCreateOptionsVmdk',
  'data': { 'file':             'BlockdevRef',
            'size':             'size',
            '*extents':          ['BlockdevRef'],
            '*subformat':       'BlockdevVmdkSubformat',
            '*backing-file':    'str',
            '*adapter-type':    'BlockdevVmdkAdapterType',
            '*hwversion':       'str',
            '*zeroed-grain':    'bool' } }


##
# @SheepdogRedundancyType:
#
# @full: Create a fully replicated vdi with x copies
# @erasure-coded: Create an erasure coded vdi with x data strips and
#                 y parity strips
#
# Since: 2.12
##
{ 'enum': 'SheepdogRedundancyType',
  'data': [ 'full', 'erasure-coded' ] }

##
# @SheepdogRedundancyFull:
#
# @copies: Number of copies to use (between 1 and 31)
#
# Since: 2.12
##
{ 'struct': 'SheepdogRedundancyFull',
  'data': { 'copies': 'int' }}

##
# @SheepdogRedundancyErasureCoded:
#
# @data-strips: Number of data strips to use (one of {2,4,8,16})
# @parity-strips: Number of parity strips to use (between 1 and 15)
#
# Since: 2.12
##
{ 'struct': 'SheepdogRedundancyErasureCoded',
  'data': { 'data-strips': 'int',
            'parity-strips': 'int' }}

##
# @SheepdogRedundancy:
#
# Since: 2.12
##
{ 'union': 'SheepdogRedundancy',
  'base': { 'type': 'SheepdogRedundancyType' },
  'discriminator': 'type',
  'data': { 'full': 'SheepdogRedundancyFull',
            'erasure-coded': 'SheepdogRedundancyErasureCoded' } }

##
# @BlockdevCreateOptionsSheepdog:
#
# Driver specific image creation options for Sheepdog.
#
# @location: Where to store the new image file
# @size: Size of the virtual disk in bytes
# @backing-file: File name of a base image
# @preallocation: Preallocation mode for the new image (default: off;
#                 allowed values: off, full)
# @redundancy: Redundancy of the image
# @object-size: Object size of the image
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsSheepdog',
  'data': { 'location':         'BlockdevOptionsSheepdog',
            'size':             'size',
            '*backing-file':    'str',
            '*preallocation':   'PreallocMode',
            '*redundancy':      'SheepdogRedundancy',
            '*object-size':     'size' } }

##
# @BlockdevCreateOptionsSsh:
#
# Driver specific image creation options for SSH.
#
# @location: Where to store the new image file
# @size: Size of the virtual disk in bytes
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsSsh',
  'data': { 'location':         'BlockdevOptionsSsh',
            'size':             'size' } }

##
# @BlockdevCreateOptionsVdi:
#
# Driver specific image creation options for VDI.
#
# @file: Node to create the image format on
# @size: Size of the virtual disk in bytes
# @preallocation: Preallocation mode for the new image (default: off;
#                 allowed values: off, metadata)
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsVdi',
  'data': { 'file':             'BlockdevRef',
            'size':             'size',
            '*preallocation':   'PreallocMode' } }

##
# @BlockdevVhdxSubformat:
#
# @dynamic: Growing image file
# @fixed:   Preallocated fixed-size image file
#
# Since: 2.12
##
{ 'enum': 'BlockdevVhdxSubformat',
  'data': [ 'dynamic', 'fixed' ] }

##
# @BlockdevCreateOptionsVhdx:
#
# Driver specific image creation options for vhdx.
#
# @file: Node to create the image format on
# @size: Size of the virtual disk in bytes
# @log-size: Log size in bytes, must be a multiple of 1 MB
#            (default: 1 MB)
# @block-size: Block size in bytes, must be a multiple of 1 MB and not
#              larger than 256 MB (default: automatically choose a block
#              size depending on the image size)
# @subformat: vhdx subformat (default: dynamic)
# @block-state-zero: Force use of payload blocks of type 'ZERO'. Non-standard,
#                    but default.  Do not set to 'off' when using 'qemu-img
#                    convert' with subformat=dynamic.
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsVhdx',
  'data': { 'file':                 'BlockdevRef',
            'size':                 'size',
            '*log-size':            'size',
            '*block-size':          'size',
            '*subformat':           'BlockdevVhdxSubformat',
            '*block-state-zero':    'bool' } }

##
# @BlockdevVpcSubformat:
#
# @dynamic: Growing image file
# @fixed:   Preallocated fixed-size image file
#
# Since: 2.12
##
{ 'enum': 'BlockdevVpcSubformat',
  'data': [ 'dynamic', 'fixed' ] }

##
# @BlockdevCreateOptionsVpc:
#
# Driver specific image creation options for vpc (VHD).
#
# @file: Node to create the image format on
# @size: Size of the virtual disk in bytes
# @subformat: vhdx subformat (default: dynamic)
# @force-size: Force use of the exact byte size instead of rounding to the
#              next size that can be represented in CHS geometry
#              (default: false)
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsVpc',
  'data': { 'file':                 'BlockdevRef',
            'size':                 'size',
            '*subformat':           'BlockdevVpcSubformat',
            '*force-size':          'bool' } }

##
# @BlockdevCreateOptions:
#
# Options for creating an image format on a given node.
#
# @driver: block driver to create the image format
#
# Since: 2.12
##
{ 'union': 'BlockdevCreateOptions',
  'base': {
      'driver':         'BlockdevDriver' },
  'discriminator': 'driver',
  'data': {
      'file':           'BlockdevCreateOptionsFile',
      'gluster':        'BlockdevCreateOptionsGluster',
      'luks':           'BlockdevCreateOptionsLUKS',
      'nfs':            'BlockdevCreateOptionsNfs',
      'parallels':      'BlockdevCreateOptionsParallels',
      'qcow':           'BlockdevCreateOptionsQcow',
      'qcow2':          'BlockdevCreateOptionsQcow2',
      'qed':            'BlockdevCreateOptionsQed',
      'rbd':            'BlockdevCreateOptionsRbd',
      'sheepdog':       'BlockdevCreateOptionsSheepdog',
      'ssh':            'BlockdevCreateOptionsSsh',
      'vdi':            'BlockdevCreateOptionsVdi',
      'vhdx':           'BlockdevCreateOptionsVhdx',
      'vmdk':           'BlockdevCreateOptionsVmdk',
      'vpc':            'BlockdevCreateOptionsVpc'
  } }

##
# @blockdev-create:
#
# Starts a job to create an image format on a given node. The job is
# automatically finalized, but a manual job-dismiss is required.
#
# @job-id:          Identifier for the newly created job.
#
# @options:         Options for the image creation.
#
# Since: 3.0
##
{ 'command': 'blockdev-create',
  'data': { 'job-id': 'str',
            'options': 'BlockdevCreateOptions' } }

##
# @BlockErrorAction:
#
# An enumeration of action that has been taken when a DISK I/O occurs
#
# @ignore: error has been ignored
#
# @report: error has been reported to the device
#
# @stop: error caused VM to be stopped
#
# Since: 2.1
##
{ 'enum': 'BlockErrorAction',
  'data': [ 'ignore', 'report', 'stop' ] }


##
# @BLOCK_IMAGE_CORRUPTED:
#
# Emitted when a disk image is being marked corrupt. The image can be
# identified by its device or node name. The 'device' field is always
# present for compatibility reasons, but it can be empty ("") if the
# image does not have a device name associated.
#
# @device: device name. This is always present for compatibility
#          reasons, but it can be empty ("") if the image does not
#          have a device name associated.
#
# @node-name: node name (Since: 2.4)
#
# @msg: informative message for human consumption, such as the kind of
#       corruption being detected. It should not be parsed by machine as it is
#       not guaranteed to be stable
#
# @offset: if the corruption resulted from an image access, this is
#          the host's access offset into the image
#
# @size: if the corruption resulted from an image access, this is
#        the access size
#
# @fatal: if set, the image is marked corrupt and therefore unusable after this
#         event and must be repaired (Since 2.2; before, every
#         BLOCK_IMAGE_CORRUPTED event was fatal)
#
# Note: If action is "stop", a STOP event will eventually follow the
#       BLOCK_IO_ERROR event.
#
# Example:
#
# <- { "event": "BLOCK_IMAGE_CORRUPTED",
#      "data": { "device": "ide0-hd0", "node-name": "node0",
#                "msg": "Prevented active L1 table overwrite", "offset": 196608,
#                "size": 65536 },
#      "timestamp": { "seconds": 1378126126, "microseconds": 966463 } }
#
# Since: 1.7
##
{ 'event': 'BLOCK_IMAGE_CORRUPTED',
  'data': { 'device'     : 'str',
            '*node-name' : 'str',
            'msg'        : 'str',
            '*offset'    : 'int',
            '*size'      : 'int',
            'fatal'      : 'bool' } }

##
# @BLOCK_IO_ERROR:
#
# Emitted when a disk I/O error occurs
#
# @device: device name. This is always present for compatibility
#          reasons, but it can be empty ("") if the image does not
#          have a device name associated.
#
# @node-name: node name. Note that errors may be reported for the root node
#             that is directly attached to a guest device rather than for the
#             node where the error occurred. The node name is not present if
#             the drive is empty. (Since: 2.8)
#
# @operation: I/O operation
#
# @action: action that has been taken
#
# @nospace: true if I/O error was caused due to a no-space
#           condition. This key is only present if query-block's
#           io-status is present, please see query-block documentation
#           for more information (since: 2.2)
#
# @reason: human readable string describing the error cause.
#          (This field is a debugging aid for humans, it should not
#          be parsed by applications) (since: 2.2)
#
# Note: If action is "stop", a STOP event will eventually follow the
#       BLOCK_IO_ERROR event
#
# Since: 0.13.0
#
# Example:
#
# <- { "event": "BLOCK_IO_ERROR",
#      "data": { "device": "ide0-hd1",
#                "node-name": "#block212",
#                "operation": "write",
#                "action": "stop" },
#      "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
#
##
{ 'event': 'BLOCK_IO_ERROR',
  'data': { 'device': 'str', '*node-name': 'str',
            'operation': 'IoOperationType',
            'action': 'BlockErrorAction', '*nospace': 'bool',
            'reason': 'str' } }

##
# @BLOCK_JOB_COMPLETED:
#
# Emitted when a block job has completed
#
# @type: job type
#
# @device: The job identifier. Originally the device name but other
#          values are allowed since QEMU 2.7
#
# @len: maximum progress value
#
# @offset: current progress value. On success this is equal to len.
#          On failure this is less than len
#
# @speed: rate limit, bytes per second
#
# @error: error message. Only present on failure. This field
#         contains a human-readable error message. There are no semantics
#         other than that streaming has failed and clients should not try to
#         interpret the error string
#
# Since: 1.1
#
# Example:
#
# <- { "event": "BLOCK_JOB_COMPLETED",
#      "data": { "type": "stream", "device": "virtio-disk0",
#                "len": 10737418240, "offset": 10737418240,
#                "speed": 0 },
#      "timestamp": { "seconds": 1267061043, "microseconds": 959568 } }
#
##
{ 'event': 'BLOCK_JOB_COMPLETED',
  'data': { 'type'  : 'JobType',
            'device': 'str',
            'len'   : 'int',
            'offset': 'int',
            'speed' : 'int',
            '*error': 'str' } }

##
# @BLOCK_JOB_CANCELLED:
#
# Emitted when a block job has been cancelled
#
# @type: job type
#
# @device: The job identifier. Originally the device name but other
#          values are allowed since QEMU 2.7
#
# @len: maximum progress value
#
# @offset: current progress value. On success this is equal to len.
#          On failure this is less than len
#
# @speed: rate limit, bytes per second
#
# Since: 1.1
#
# Example:
#
# <- { "event": "BLOCK_JOB_CANCELLED",
#      "data": { "type": "stream", "device": "virtio-disk0",
#                "len": 10737418240, "offset": 134217728,
#                "speed": 0 },
#      "timestamp": { "seconds": 1267061043, "microseconds": 959568 } }
#
##
{ 'event': 'BLOCK_JOB_CANCELLED',
  'data': { 'type'  : 'JobType',
            'device': 'str',
            'len'   : 'int',
            'offset': 'int',
            'speed' : 'int' } }

##
# @BLOCK_JOB_ERROR:
#
# Emitted when a block job encounters an error
#
# @device: The job identifier. Originally the device name but other
#          values are allowed since QEMU 2.7
#
# @operation: I/O operation
#
# @action: action that has been taken
#
# Since: 1.3
#
# Example:
#
# <- { "event": "BLOCK_JOB_ERROR",
#      "data": { "device": "ide0-hd1",
#                "operation": "write",
#                "action": "stop" },
#      "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
#
##
{ 'event': 'BLOCK_JOB_ERROR',
  'data': { 'device'   : 'str',
            'operation': 'IoOperationType',
            'action'   : 'BlockErrorAction' } }

##
# @BLOCK_JOB_READY:
#
# Emitted when a block job is ready to complete
#
# @type: job type
#
# @device: The job identifier. Originally the device name but other
#          values are allowed since QEMU 2.7
#
# @len: maximum progress value
#
# @offset: current progress value. On success this is equal to len.
#          On failure this is less than len
#
# @speed: rate limit, bytes per second
#
# Note: The "ready to complete" status is always reset by a @BLOCK_JOB_ERROR
#       event
#
# Since: 1.3
#
# Example:
#
# <- { "event": "BLOCK_JOB_READY",
#      "data": { "device": "drive0", "type": "mirror", "speed": 0,
#                "len": 2097152, "offset": 2097152 }
#      "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
#
##
{ 'event': 'BLOCK_JOB_READY',
  'data': { 'type'  : 'JobType',
            'device': 'str',
            'len'   : 'int',
            'offset': 'int',
            'speed' : 'int' } }

##
# @BLOCK_JOB_PENDING:
#
# Emitted when a block job is awaiting explicit authorization to finalize graph
# changes via @block-job-finalize. If this job is part of a transaction, it will
# not emit this event until the transaction has converged first.
#
# @type: job type
#
# @id: The job identifier.
#
# Since: 2.12
#
# Example:
#
# <- { "event": "BLOCK_JOB_WAITING",
#      "data": { "device": "drive0", "type": "mirror" },
#      "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
#
##
{ 'event': 'BLOCK_JOB_PENDING',
  'data': { 'type'  : 'JobType',
            'id'    : 'str' } }

##
# @PreallocMode:
#
# Preallocation mode of QEMU image file
#
# @off: no preallocation
# @metadata: preallocate only for metadata
# @falloc: like @full preallocation but allocate disk space by
#          posix_fallocate() rather than writing data.
# @full: preallocate all data by writing it to the device to ensure
#        disk space is really available. This data may or may not be
#        zero, depending on the image format and storage.
#        @full preallocation also sets up metadata correctly.
#
# Since: 2.2
##
{ 'enum': 'PreallocMode',
  'data': [ 'off', 'metadata', 'falloc', 'full' ] }

##
# @BLOCK_WRITE_THRESHOLD:
#
# Emitted when writes on block device reaches or exceeds the
# configured write threshold. For thin-provisioned devices, this
# means the device should be extended to avoid pausing for
# disk exhaustion.
# The event is one shot. Once triggered, it needs to be
# re-registered with another block-set-write-threshold command.
#
# @node-name: graph node name on which the threshold was exceeded.
#
# @amount-exceeded: amount of data which exceeded the threshold, in bytes.
#
# @write-threshold: last configured threshold, in bytes.
#
# Since: 2.3
##
{ 'event': 'BLOCK_WRITE_THRESHOLD',
  'data': { 'node-name': 'str',
            'amount-exceeded': 'uint64',
            'write-threshold': 'uint64' } }

##
# @block-set-write-threshold:
#
# Change the write threshold for a block drive. An event will be
# delivered if a write to this block drive crosses the configured
# threshold.  The threshold is an offset, thus must be
# non-negative. Default is no write threshold. Setting the threshold
# to zero disables it.
#
# This is useful to transparently resize thin-provisioned drives without
# the guest OS noticing.
#
# @node-name: graph node name on which the threshold must be set.
#
# @write-threshold: configured threshold for the block device, bytes.
#                   Use 0 to disable the threshold.
#
# Since: 2.3
#
# Example:
#
# -> { "execute": "block-set-write-threshold",
#      "arguments": { "node-name": "mydev",
#                     "write-threshold": 17179869184 } }
# <- { "return": {} }
#
##
{ 'command': 'block-set-write-threshold',
  'data': { 'node-name': 'str', 'write-threshold': 'uint64' } }

##
# @x-blockdev-change:
#
# Dynamically reconfigure the block driver state graph. It can be used
# to add, remove, insert or replace a graph node. Currently only the
# Quorum driver implements this feature to add or remove its child. This
# is useful to fix a broken quorum child.
#
# If @node is specified, it will be inserted under @parent. @child
# may not be specified in this case. If both @parent and @child are
# specified but @node is not, @child will be detached from @parent.
#
# @parent: the id or name of the parent node.
#
# @child: the name of a child under the given parent node.
#
# @node: the name of the node that will be added.
#
# Note: this command is experimental, and its API is not stable. It
#       does not support all kinds of operations, all kinds of children, nor
#       all block drivers.
#
#       FIXME Removing children from a quorum node means introducing gaps in the
#       child indices. This cannot be represented in the 'children' list of
#       BlockdevOptionsQuorum, as returned by .bdrv_refresh_filename().
#
#       Warning: The data in a new quorum child MUST be consistent with that of
#       the rest of the array.
#
# Since: 2.7
#
# Example:
#
# 1. Add a new node to a quorum
# -> { "execute": "blockdev-add",
#      "arguments": {
#          "driver": "raw",
#          "node-name": "new_node",
#          "file": { "driver": "file",
#                    "filename": "test.raw" } } }
# <- { "return": {} }
# -> { "execute": "x-blockdev-change",
#      "arguments": { "parent": "disk1",
#                     "node": "new_node" } }
# <- { "return": {} }
#
# 2. Delete a quorum's node
# -> { "execute": "x-blockdev-change",
#      "arguments": { "parent": "disk1",
#                     "child": "children.1" } }
# <- { "return": {} }
#
##
{ 'command': 'x-blockdev-change',
  'data' : { 'parent': 'str',
             '*child': 'str',
             '*node': 'str' } }

##
# @x-blockdev-set-iothread:
#
# Move @node and its children into the @iothread.  If @iothread is null then
# move @node and its children into the main loop.
#
# The node must not be attached to a BlockBackend.
#
# @node-name: the name of the block driver node
#
# @iothread: the name of the IOThread object or null for the main loop
#
# @force: true if the node and its children should be moved when a BlockBackend
#         is already attached
#
# Note: this command is experimental and intended for test cases that need
#       control over IOThreads only.
#
# Since: 2.12
#
# Example:
#
# 1. Move a node into an IOThread
# -> { "execute": "x-blockdev-set-iothread",
#      "arguments": { "node-name": "disk1",
#                     "iothread": "iothread0" } }
# <- { "return": {} }
#
# 2. Move a node into the main loop
# -> { "execute": "x-blockdev-set-iothread",
#      "arguments": { "node-name": "disk1",
#                     "iothread": null } }
# <- { "return": {} }
#
##
{ 'command': 'x-blockdev-set-iothread',
  'data' : { 'node-name': 'str',
             'iothread': 'StrOrNull',
             '*force': 'bool' } }

##
# @NbdServerOptions:
#
# @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).
#
# Keep this type consistent with the nbd-server-start arguments. The only
# intended difference is using SocketAddress instead of SocketAddressLegacy.
#
# Since: 4.2
##
{ 'struct': 'NbdServerOptions',
  'data': { 'addr': 'SocketAddress',
            '*tls-creds': 'str',
            '*tls-authz': 'str'} }

##
# @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.
# @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).
#
# Returns: error if the server is already running.
#
# Keep this type consistent with the NbdServerOptions type. The only intended
# difference is using SocketAddressLegacy instead of SocketAddress.
#
# Since: 1.3.0
##
{ 'command': 'nbd-server-start',
  'data': { 'addr': 'SocketAddressLegacy',
            '*tls-creds': 'str',
            '*tls-authz': 'str'} }

##
# @BlockExportNbd:
#
# An NBD block export.
#
# @device: The device name or node name of the node to be exported
#
# @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)
#
# @writable: Whether clients should be able to write to the device via the
#            NBD connection (default false).
#
# @bitmap: Also export the dirty bitmap reachable from @device, so the
#          NBD client can use NBD_OPT_SET_META_CONTEXT with
#          "qemu:dirty-bitmap:NAME" to inspect the bitmap. (since 4.0)
#
# Since: 5.0
##
{ 'struct': 'BlockExportNbd',
  'data': {'device': 'str', '*name': 'str', '*description': 'str',
           '*writable': 'bool', '*bitmap': 'str' } }

##
# @nbd-server-add:
#
# Export a block node to QEMU's embedded NBD server.
#
# Returns: error if the server is not running, or export with the same name
#          already exists.
#
# Since: 1.3.0
##
{ 'command': 'nbd-server-add',
  'data': 'BlockExportNbd', 'boxed': true }

##
# @NbdServerRemoveMode:
#
# Mode for removing an NBD export.
#
# @safe: Remove export if there are no existing connections, fail otherwise.
#
# @hard: Drop all connections immediately and remove export.
#
# 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': 'NbdServerRemoveMode', 'data': ['safe', 'hard']}

##
# @nbd-server-remove:
#
# Remove NBD export by name.
#
# @name: Export name.
#
# @mode: Mode of command operation. See @NbdServerRemoveMode description.
#        Default is 'safe'.
#
# Returns: error if
#            - the server is not running
#            - export is not found
#            - mode is 'safe' and there are existing connections
#
# Since: 2.12
##
{ 'command': 'nbd-server-remove',
  'data': {'name': 'str', '*mode': 'NbdServerRemoveMode'} }

##
# @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' }

##
# @BlockExportType:
#
# An enumeration of block export types
#
# @nbd: NBD export
#
# Since: 4.2
##
{ 'enum': 'BlockExportType',
  'data': [ 'nbd' ] }

##
# @BlockExport:
#
# Describes a block export, i.e. how single node should be exported on an
# external interface.
#
# Since: 4.2
##
{ 'union': 'BlockExport',
  'base': { 'type': 'BlockExportType' },
  'discriminator': 'type',
  'data': {
      'nbd': 'BlockExportNbd'
   } }

##
# @QuorumOpType:
#
# An enumeration of the quorum operation types
#
# @read: read operation
#
# @write: write operation
#
# @flush: flush operation
#
# Since: 2.6
##
{ 'enum': 'QuorumOpType',
  'data': [ 'read', 'write', 'flush' ] }

##
# @QUORUM_FAILURE:
#
# Emitted by the Quorum block driver if it fails to establish a quorum
#
# @reference: device name if defined else node name
#
# @sector-num: number of the first sector of the failed read operation
#
# @sectors-count: failed read operation sector count
#
# Note: This event is rate-limited.
#
# Since: 2.0
#
# Example:
#
# <- { "event": "QUORUM_FAILURE",
#      "data": { "reference": "usr1", "sector-num": 345435, "sectors-count": 5 },
#      "timestamp": { "seconds": 1344522075, "microseconds": 745528 } }
#
##
{ 'event': 'QUORUM_FAILURE',
  'data': { 'reference': 'str', 'sector-num': 'int', 'sectors-count': 'int' } }

##
# @QUORUM_REPORT_BAD:
#
# Emitted to report a corruption of a Quorum file
#
# @type: quorum operation type (Since 2.6)
#
# @error: error message. Only present on failure. This field
#         contains a human-readable error message. There are no semantics other
#         than that the block layer reported an error and clients should not
#         try to interpret the error string.
#
# @node-name: the graph node name of the block driver state
#
# @sector-num: number of the first sector of the failed read operation
#
# @sectors-count: failed read operation sector count
#
# Note: This event is rate-limited.
#
# Since: 2.0
#
# Example:
#
# 1. Read operation
#
# { "event": "QUORUM_REPORT_BAD",
#      "data": { "node-name": "node0", "sector-num": 345435, "sectors-count": 5,
#                "type": "read" },
#      "timestamp": { "seconds": 1344522075, "microseconds": 745528 } }
#
# 2. Flush operation
#
# { "event": "QUORUM_REPORT_BAD",
#      "data": { "node-name": "node0", "sector-num": 0, "sectors-count": 2097120,
#                "type": "flush", "error": "Broken pipe" },
#      "timestamp": { "seconds": 1456406829, "microseconds": 291763 } }
#
##
{ 'event': 'QUORUM_REPORT_BAD',
  'data': { 'type': 'QuorumOpType', '*error': 'str', 'node-name': 'str',
            'sector-num': 'int', 'sectors-count': 'int' } }

##
# @BlockdevSnapshotInternal:
#
# @device: the device name or node-name of a root node 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. If the name is an empty
# string, or a snapshot with name already exists, the operation will
# fail.
#
# For the arguments, see the documentation of BlockdevSnapshotInternal.
#
# Returns: - nothing on success
#          - If @device is not a valid block device, GenericError
#          - 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
#
# Example:
#
# -> { "execute": "blockdev-snapshot-internal-sync",
#      "arguments": { "device": "ide-hd0",
#                     "name": "snapshot0" }
#    }
# <- { "return": {} }
#
##
{ '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 device name or node-name of a root node 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, GenericError
#          - 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
#
# Example:
#
# -> { "execute": "blockdev-snapshot-delete-internal-sync",
#      "arguments": { "device": "ide-hd0",
#                     "name": "snapshot0" }
#    }
# <- { "return": {
#                    "id": "1",
#                    "name": "snapshot0",
#                    "vm-state-size": 0,
#                    "date-sec": 1000012,
#                    "date-nsec": 10,
#                    "vm-clock-sec": 100,
#                    "vm-clock-nsec": 20
#      }
#    }
#
##
{ 'command': 'blockdev-snapshot-delete-internal-sync',
  'data': { 'device': 'str', '*id': 'str', '*name': 'str'},
  'returns': 'SnapshotInfo' }