blockjob: add new monitor json conversions

The previous patch hoisted some bounds checks to the callers;
but someone that is not aware of the hoisted check could now
try passing an integer between LLONG_MAX and ULLONG_MAX.  As a
safety measure, add new json conversion modes that let libvirt
error out early instead of pass bad numbers to qemu, if the
caller ever makes a mistake due to later refactoring.

Convert the various blockjob QMP calls to use the new modes,
and switch some of them to be optional (QMP has always supported
an omitted "speed" the same as "speed":0, for everything except
block-job-set-speed).

* src/qemu/qemu_monitor_json.c (qemuMonitorJSONMakeCommandRaw):
Add 'j'/'y' and 'J'/'Y' to error out on negative input.
(qemuMonitorJSONDriveMirror, qemuMonitorJSONBlockCommit)
(qemuMonitorJSONBlockJob): Use it.
Signed-off-by: NEric Blake <eblake@redhat.com>

src/qemu/qemu_monitor_json.c

@@ -457,10 +457,14 @@ qemuMonitorJSONMakeCommandRaw(bool wrap, const char *cmdname, ...)
          * S: string value, omitted if null
          *
          * i: signed integer value
+         * j: signed integer value, error if negative
          * z: signed integer value, omitted if zero
+         * y: signed integer value, omitted if zero, error if negative
          *
          * I: signed long integer value
+         * J: signed long integer value, error if negative
          * Z: signed long integer value, omitted if zero
+         * Y: signed long integer value, omitted if zero, error if negative
          *
          * u: unsigned integer value
          * p: unsigned integer value, omitted if zero
@@ -500,10 +504,19 @@ qemuMonitorJSONMakeCommandRaw(bool wrap, const char *cmdname, ...)
         }   break;
 
         case 'z':
+        case 'y':
+        case 'j':
         case 'i': {
             int val = va_arg(args, int);
 
-            if (!val && type == 'z')
+            if (val < 0 && (type == 'j' || type == 'y')) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("argument key '%s' must not be negative"),
+                               key);
+                goto error;
+            }
+
+            if (!val && (type == 'z' || type == 'y'))
                 continue;
 
             ret = virJSONValueObjectAppendNumberInt(jargs, key, val);
@@ -520,10 +533,19 @@ qemuMonitorJSONMakeCommandRaw(bool wrap, const char *cmdname, ...)
         }   break;
 
         case 'Z':
+        case 'Y':
+        case 'J':
         case 'I': {
             long long val = va_arg(args, long long);
 
-            if (!val && type == 'Z')
+            if (val < 0 && (type == 'J' || type == 'Y')) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("argument key '%s' must not be negative"),
+                               key);
+                goto error;
+            }
+
+            if (!val && (type == 'Z' || type == 'Y'))
                 continue;
 
             ret = virJSONValueObjectAppendNumberLong(jargs, key, val);
@@ -3408,7 +3430,7 @@ qemuMonitorJSONDriveMirror(qemuMonitorPtr mon,
     cmd = qemuMonitorJSONMakeCommand("drive-mirror",
                                      "s:device", device,
                                      "s:target", file,
-                                     "U:speed", speed,
+                                     "Y:speed", speed,
                                      "s:sync", shallow ? "top" : "full",
                                      "s:mode", reuse ? "existing" : "absolute-paths",
                                      "S:format", format,
@@ -3474,7 +3496,7 @@ qemuMonitorJSONBlockCommit(qemuMonitorPtr mon, const char *device,
 
     cmd = qemuMonitorJSONMakeCommand("block-commit",
                                      "s:device", device,
-                                     "U:speed", speed,
+                                     "Y:speed", speed,
                                      "S:top", top,
                                      "S:base", base,
                                      "S:backing-file", backingName,
@@ -3849,7 +3871,7 @@ qemuMonitorJSONBlockJob(qemuMonitorPtr mon,
         cmd_name = modern ? "block-job-set-speed" : "block_job_set_speed";
         cmd = qemuMonitorJSONMakeCommand(cmd_name,
                                          "s:device", device,
-                                         modern ? "U:speed" : "U:value", speed,
+                                         modern ? "J:speed" : "J:value", speed,
                                          NULL);
         break;
 
@@ -3857,7 +3879,7 @@ qemuMonitorJSONBlockJob(qemuMonitorPtr mon,
         cmd_name = modern ? "block-stream" : "block_stream";
         cmd = qemuMonitorJSONMakeCommand(cmd_name,
                                          "s:device", device,
-                                         "P:speed", speed,
+                                         "Y:speed", speed,
                                          "S:base", base,
                                          "S:backing-file", backingName,
                                          NULL);