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>

include/block/blockjob.h

@@ -172,6 +172,17 @@ bool block_job_has_bdrv(BlockJob *job, BlockDriverState *bs);
  */
 bool block_job_set_speed_locked(BlockJob *job, int64_t speed, Error **errp);
 
+/**
+ * block_job_change_locked:
+ * @job: The job to change.
+ * @opts: The new options.
+ * @errp: Error object.
+ *
+ * Change the job according to opts.
+ */
+void block_job_change_locked(BlockJob *job, BlockJobChangeOptions *opts,
+                             Error **errp);
+
 /**
  * block_job_query_locked:
  * @job: The job to get information about.

include/block/blockjob_int.h

@@ -67,6 +67,18 @@ struct BlockJobDriver {
     void (*attached_aio_context)(BlockJob *job, AioContext *new_context);
 
     void (*set_speed)(BlockJob *job, int64_t speed);
+
+    /*
+     * Change the @job's options according to @opts.
+     *
+     * Note that this can already be called before the job coroutine is running.
+     */
+    void (*change)(BlockJob *job, BlockJobChangeOptions *opts, Error **errp);
+
+    /*
+     * Query information specific to this kind of block job.
+     */
+    void (*query)(BlockJob *job, BlockJobInfo *info);
 };
 
 /*

include/qemu/defer-call.h

@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Deferred calls
+ *
+ * Copyright Red Hat.
+ */
+
+#ifndef QEMU_DEFER_CALL_H
+#define QEMU_DEFER_CALL_H
+
+/* See documentation in util/defer-call.c */
+void defer_call_begin(void);
+void defer_call_end(void);
+void defer_call(void (*fn)(void *), void *opaque);
+
+#endif /* QEMU_DEFER_CALL_H */

include/sysemu/block-backend-io.h

@@ -100,10 +100,6 @@ void blk_iostatus_set_err(BlockBackend *blk, int error);
 int blk_get_max_iov(BlockBackend *blk);
 int blk_get_max_hw_iov(BlockBackend *blk);
 
-void blk_io_plug(void);
-void blk_io_unplug(void);
-void blk_io_plug_call(void (*fn)(void *), void *opaque);
-
 AioContext *blk_get_aio_context(BlockBackend *blk);
 BlockAcctStats *blk_get_stats(BlockBackend *blk);
 void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk,