Block layer patches

- virtio-blk: use blk_io_plug_call() instead of notification BH
 - mirror: allow switching from background to active mode
 - qemu-img rebase: add compression support
 - Fix locking in media change monitor commands
 - Fix a few blockjob-related deadlocks when using iothread
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Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- virtio-blk: use blk_io_plug_call() instead of notification BH
- mirror: allow switching from background to active mode
- qemu-img rebase: add compression support
- Fix locking in media change monitor commands
- Fix a few blockjob-related deadlocks when using iothread

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* tag 'for-upstream' of https://repo.or.cz/qemu/kevin: (27 commits)
  iotests: add test for changing mirror's copy_mode
  mirror: return mirror-specific information upon query
  blockjob: query driver-specific info via a new 'query' driver method
  qapi/block-core: turn BlockJobInfo into a union
  qapi/block-core: use JobType for BlockJobInfo's type
  mirror: implement mirror_change method
  block/mirror: determine copy_to_target only once
  block/mirror: move dirty bitmap to filter
  block/mirror: set actively_synced even after the job is ready
  blockjob: introduce block-job-change QMP command
  virtio-blk: remove batch notification BH
  virtio: use defer_call() in virtio_irqfd_notify()
  util/defer-call: move defer_call() to util/
  block: rename blk_io_plug_call() API to defer_call()
  blockdev: mirror: avoid potential deadlock when using iothread
  block: avoid potential deadlock during bdrv_graph_wrlock() in bdrv_close()
  blockjob: drop AioContext lock before calling bdrv_graph_wrlock()
  iotests: Test media change with iothreads
  block: Fix locking in media change monitor commands
  iotests: add tests for "qemu-img rebase" with compression
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

qapi/block-core.json

@@ -1352,6 +1352,20 @@
 { 'enum': 'MirrorCopyMode',
   'data': ['background', 'write-blocking'] }
 
+##
+# @BlockJobInfoMirror:
+#
+# Information specific to mirror block jobs.
+#
+# @actively-synced: Whether the source is actively synced to the
+#     target, i.e. same data and new writes are done synchronously to
+#     both.
+#
+# Since 8.2
+##
+{ 'struct': 'BlockJobInfoMirror',
+  'data': { 'actively-synced': 'bool' } }
+
 ##
 # @BlockJobInfo:
 #
@@ -1395,13 +1409,15 @@
 #
 # Since: 1.1
 ##
-{ 'struct': 'BlockJobInfo',
-  'data': {'type': 'str', 'device': 'str', 'len': 'int',
+{ 'union': 'BlockJobInfo',
+  'base': {'type': 'JobType', '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' } }
+           '*error': 'str' },
+  'discriminator': 'type',
+  'data': { 'mirror': 'BlockJobInfoMirror' } }
 
 ##
 # @query-block-jobs:
@@ -3044,6 +3060,43 @@
 { 'command': 'block-job-finalize', 'data': { 'id': 'str' },
   'allow-preconfig': true }
 
+##
+# @BlockJobChangeOptionsMirror:
+#
+# @copy-mode: Switch to this copy mode.  Currently, only the switch
+#     from 'background' to 'write-blocking' is implemented.
+#
+# Since: 8.2
+##
+{ 'struct': 'BlockJobChangeOptionsMirror',
+  'data': { 'copy-mode' : 'MirrorCopyMode' } }
+
+##
+# @BlockJobChangeOptions:
+#
+# Block job options that can be changed after job creation.
+#
+# @id: The job identifier
+#
+# @type: The job type
+#
+# Since 8.2
+##
+{ 'union': 'BlockJobChangeOptions',
+  'base': { 'id': 'str', 'type': 'JobType' },
+  'discriminator': 'type',
+  'data': { 'mirror': 'BlockJobChangeOptionsMirror' } }
+
+##
+# @block-job-change:
+#
+# Change the block job's options.
+#
+# Since: 8.2
+##
+{ 'command': 'block-job-change',
+  'data': 'BlockJobChangeOptions', 'boxed': true }
+
 ##
 # @BlockdevDiscardOptions:
 #

qapi/job.json

@@ -105,11 +105,13 @@
 #
 # @finalize: see @job-finalize
 #
+# @change: see @block-job-change (since 8.2)
+#
 # Since: 2.12
 ##
 { 'enum': 'JobVerb',
   'data': ['cancel', 'pause', 'resume', 'set-speed', 'complete', 'dismiss',
-           'finalize' ] }
+           'finalize', 'change' ] }
 
 ##
 # @JOB_STATUS_CHANGE: