[Qemu-devel] [PATCH v8 05/14] blockjob: Add "ready" field

[Max Reitz <mreitz@redhat.com>]

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 <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
---
 blockjob.c               | 7 ++++++-
 include/block/blockjob.h | 5 +++++
 qapi/block-core.json     | 4 +++-
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/blockjob.c b/blockjob.c
index 2423c8a..108cadd 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -246,6 +246,7 @@ 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;
 }
 
@@ -274,7 +275,11 @@ 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 df289dc..5db4c14 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/block-core.json b/qapi/block-core.json
index 7215e48..864285c 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -505,12 +505,14 @@
 #
 # @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:
-- 
2.0.0