[Qemu-devel] [PATCH v6 05/14] blockjob: Add "ready" field

[Max Reitz]

When a block job signals readiness, this is currently reported only
through QMP. If qemu wants to use block jobs for internal tasks, there
needs to be another way to correctly detect when a block job may be
completed.

For this reason, introduce a bool "ready" which is set when the block
job may be completed.

Signed-off-by: Max Reitz <mre...@redhat.com>
Reviewed-by: Eric Blake <ebl...@redhat.com>
Reviewed-by: Kevin Wolf <kw...@redhat.com>
---
 blockjob.c               | 7 ++++++-
 include/block/blockjob.h | 5 +++++
 qapi-schema.json         | 4 +++-
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/blockjob.c b/blockjob.c
index 9c7b198..a4271c1 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -242,6 +242,7 @@ BlockJobInfo *block_job_query(BlockJob *job)
     info->offset    = job->offset;
     info->speed     = job->speed;
     info->io_status = job->iostatus;
+    info->ready     = job->ready;
     return info;
 }
 
@@ -270,7 +271,11 @@ QObject *qobject_from_block_job(BlockJob *job)
 
 void block_job_ready(BlockJob *job)
 {
-    QObject *data = qobject_from_block_job(job);
+    QObject *data;
+
+    job->ready = true;
+
+    data = qobject_from_block_job(job);
     monitor_protocol_event(QEVENT_BLOCK_JOB_READY, data);
     qobject_decref(data);
 }
diff --git a/include/block/blockjob.h b/include/block/blockjob.h
index 626ea42..4a920e7 100644
--- a/include/block/blockjob.h
+++ b/include/block/blockjob.h
@@ -91,6 +91,11 @@ struct BlockJob {
      */
     bool busy;
 
+    /**
+     * Set to true when the job is ready to be completed.
+     */
+    bool ready;
+
     /** Status that is published by the query-block-jobs QMP API */
     BlockDeviceIoStatus iostatus;
 
diff --git a/qapi-schema.json b/qapi-schema.json
index 0b00427..cf1f7aa 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1573,12 +1573,14 @@
 #
 # @io-status: the status of the job (since 1.3)
 #
+# @ready: true if the job may be completed (since 2.1)
+#
 # Since: 1.1
 ##
 { 'type': 'BlockJobInfo',
   'data': {'type': 'str', 'device': 'str', 'len': 'int',
            'offset': 'int', 'busy': 'bool', 'paused': 'bool', 'speed': 'int',
-           'io-status': 'BlockDeviceIoStatus'} }
+           'io-status': 'BlockDeviceIoStatus', 'ready': 'bool'} }
 
 ##
 # @query-block-jobs:
-- 
1.9.2