qemu: monitor: Add support for 'job-cancel' command

This belongs to the new job management API which can manage also
non-block based jobs. Since we'll need to be able to attempt to cancel
jobs which potentially were not started (during reconnect) the 'quiet'
flag allows to suppress errors reported.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/qemu/qemu_monitor.c

@@ -3475,6 +3475,19 @@ qemuMonitorJobDismiss(qemuMonitorPtr mon,
 }
 
 
+int
+qemuMonitorJobCancel(qemuMonitorPtr mon,
+                     const char *jobname,
+                     bool quiet)
+{
+    VIR_DEBUG("jobname='%s' quiet=%d", jobname, quiet);
+
+    QEMU_CHECK_MONITOR(mon);
+
+    return qemuMonitorJSONJobCancel(mon, jobname, quiet);
+}
+
+
 int
 qemuMonitorSetBlockIoThrottle(qemuMonitorPtr mon,
                               const char *drivealias,

src/qemu/qemu_monitor.h

@@ -991,6 +991,11 @@ int qemuMonitorJobDismiss(qemuMonitorPtr mon,
                           const char *jobname)
     ATTRIBUTE_NONNULL(2);
 
+int qemuMonitorJobCancel(qemuMonitorPtr mon,
+                         const char *jobname,
+                         bool quiet)
+    ATTRIBUTE_NONNULL(2);
+
 int qemuMonitorOpenGraphics(qemuMonitorPtr mon,
                             const char *protocol,
                             int fd,

src/qemu/qemu_monitor_json.c

@@ -5088,6 +5088,34 @@ qemuMonitorJSONJobDismiss(qemuMonitorPtr mon,
 }
 
 
+int
+qemuMonitorJSONJobCancel(qemuMonitorPtr mon,
+                         const char *jobname,
+                         bool quiet)
+{
+    VIR_AUTOPTR(virJSONValue) cmd = NULL;
+    VIR_AUTOPTR(virJSONValue) reply = NULL;
+
+    if (!(cmd = qemuMonitorJSONMakeCommand("job-cancel",
+                                           "s:id", jobname,
+                                           NULL)))
+        return -1;
+
+    if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
+        return -1;
+
+    if (quiet) {
+        if (virJSONValueObjectHasKey(reply, "error") != 0)
+            return -1;
+    } else {
+        if (qemuMonitorJSONBlockJobError(cmd, reply, jobname) < 0)
+            return -1;
+    }
+
+    return 0;
+}
+
+
 int qemuMonitorJSONOpenGraphics(qemuMonitorPtr mon,
                                 const char *protocol,
                                 const char *fdname,

src/qemu/qemu_monitor_json.h

@@ -332,6 +332,11 @@ int qemuMonitorJSONJobDismiss(qemuMonitorPtr mon,
                               const char *jobname)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
 
+int qemuMonitorJSONJobCancel(qemuMonitorPtr mon,
+                             const char *jobname,
+                             bool quiet)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
+
 int qemuMonitorJSONSetLink(qemuMonitorPtr mon,
                            const char *name,
                            virDomainNetInterfaceLinkState state);

tests/qemumonitorjsontest.c

@@ -1341,6 +1341,7 @@ GEN_TEST_FUNC(qemuMonitorJSONAddBitmap, "node", "bitmap", true)
 GEN_TEST_FUNC(qemuMonitorJSONEnableBitmap, "node", "bitmap")
 GEN_TEST_FUNC(qemuMonitorJSONDeleteBitmap, "node", "bitmap")
 GEN_TEST_FUNC(qemuMonitorJSONJobDismiss, "jobname")
+GEN_TEST_FUNC(qemuMonitorJSONJobCancel, "jobname", false)
 
 static int
 testQemuMonitorJSONqemuMonitorJSONNBDServerStart(const void *opaque)
@@ -3059,6 +3060,7 @@ mymain(void)
     DO_TEST_GEN(qemuMonitorJSONEnableBitmap);
     DO_TEST_GEN(qemuMonitorJSONDeleteBitmap);
     DO_TEST_GEN(qemuMonitorJSONJobDismiss);
+    DO_TEST_GEN(qemuMonitorJSONJobCancel);
     DO_TEST(qemuMonitorJSONGetBalloonInfo);
     DO_TEST(qemuMonitorJSONGetBlockInfo);
     DO_TEST(qemuMonitorJSONGetAllBlockStatsInfo);