[RFC 05/15] qapi: JobChangeOptions: make type member optional and deprecated

[Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>]

Now QEMU can understand type directly from the job itself, type is
redundant.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
---
 blockjob.c                           |  2 +-
 docs/about/deprecated.rst            |  6 ++++++
 job-qmp.c                            | 17 +++++++++++++++++
 qapi/block-core.json                 | 10 ++++++++--
 stubs/meson.build                    |  1 +
 stubs/qapi-jobchangeoptions-mapper.c |  8 ++++++++
 6 files changed, 41 insertions(+), 3 deletions(-)
 create mode 100644 stubs/qapi-jobchangeoptions-mapper.c

diff --git a/blockjob.c b/blockjob.c
index 788cb1e07d..33c40e7d25 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -319,7 +319,7 @@ void block_job_change_locked(BlockJob *job, JobChangeOptions *opts,
 
     GLOBAL_STATE_CODE();
 
-    if (job_type(&job->job) != opts->type) {
+    if (opts->has_type && job_type(&job->job) != opts->type) {
         error_setg(errp, "Job '%s' is '%s' job, not '%s'", job->job.id,
                    job_type_str(&job->job), JobType_str(opts->type));
         return;
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index dfd681cd02..64981e5e4a 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -142,6 +142,12 @@ accepted incorrect commands will return an error. Users should make sure that
 all arguments passed to ``device_add`` are consistent with the documented
 property types.
 
+
+``block-job-change`` argument ``type`` (since 9.1)
+''''''''''''''''''''''''''''''''''''''''''''''''''
+
+QEMU can get job type from the job itself (by @id), @type field is redundant.
+
 QEMU Machine Protocol (QMP) events
 ----------------------------------
 
diff --git a/job-qmp.c b/job-qmp.c
index 9e26fa899f..c486df9579 100644
--- a/job-qmp.c
+++ b/job-qmp.c
@@ -26,6 +26,8 @@
 #include "qemu/osdep.h"
 #include "qemu/job.h"
 #include "qapi/qapi-commands-job.h"
+#include "qapi/qapi-types-block-core.h"
+#include "qapi/qapi-visit-block-core.h"
 #include "qapi/error.h"
 #include "trace/trace-root.h"
 
@@ -186,3 +188,18 @@ JobInfoList *qmp_query_jobs(Error **errp)
 
     return head;
 }
+
+bool JobChangeOptions_mapper(JobChangeOptions *opts, JobType *out, Error **errp)
+{
+    Job *job;
+
+    JOB_LOCK_GUARD();
+
+    job = find_job_locked(opts->id, errp);
+    if (!job) {
+        return false;
+    }
+
+    *out = job_type(job);
+    return true;
+}
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 6041e7bd8f..3d890dfcd0 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -3082,11 +3082,17 @@
 #
 # @type: The job type
 #
+# Features:
+#
+# @deprecated: Members @type is deprecated. Qemu can get type from
+#     the job itself, @type is redundant.
+#
 # Since: 8.2
 ##
 { 'union': 'JobChangeOptions',
-  'base': { 'id': 'str', 'type': 'JobType' },
-  'discriminator': 'type',
+  'base': { 'id': 'str',
+            '*type': { 'type': 'JobType', 'features': ['deprecated'] } },
+  'discriminator': 'JobType',
   'data': { 'mirror': 'JobChangeOptionsMirror' } }
 
 ##
diff --git a/stubs/meson.build b/stubs/meson.build
index 0bf25e6ca5..e480400a6c 100644
--- a/stubs/meson.build
+++ b/stubs/meson.build
@@ -31,6 +31,7 @@ stub_ss.add(files('module-opts.c'))
 stub_ss.add(files('monitor.c'))
 stub_ss.add(files('monitor-core.c'))
 stub_ss.add(files('physmem.c'))
+stub_ss.add(files('qapi-jobchangeoptions-mapper.c'))
 stub_ss.add(files('qemu-timer-notify-cb.c'))
 stub_ss.add(files('memory_device.c'))
 stub_ss.add(files('qmp-command-available.c'))
diff --git a/stubs/qapi-jobchangeoptions-mapper.c b/stubs/qapi-jobchangeoptions-mapper.c
new file mode 100644
index 0000000000..e4acfd91b3
--- /dev/null
+++ b/stubs/qapi-jobchangeoptions-mapper.c
@@ -0,0 +1,8 @@
+#include "qemu/osdep.h"
+#include "qapi/qapi-visit-block-core.h"
+#include "qapi/qapi-types-job.h"
+
+bool JobChangeOptions_mapper(JobChangeOptions *opts, JobType *out, Error **errp)
+{
+    g_assert_not_reached();
+}
-- 
2.34.1