[libvirt] [PATCH 4/4] backup: Add new parameters to qemu monitor nbd-server-add

[Eric Blake]

The upcoming virDomainBackup() API needs to take advantage of the
ability to expose a bitmap as part of nbd-server-add for a pull-mode
backup (this is the recently-added QEMU_CAPS_NBD_BITMAP capability).

Signed-off-by: Eric Blake <eblake at redhat.com>
---
 src/qemu/qemu_monitor.h      |  4 +++-
 src/qemu/qemu_monitor_json.h |  4 +++-
 src/qemu/qemu_migration.c    |  2 +-
 src/qemu/qemu_monitor.c      | 10 +++++++---
 src/qemu/qemu_monitor_json.c |  7 ++++++-
 tests/qemumonitorjsontest.c  |  2 +-
 6 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index 30474c325d..482d51c41d 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -1118,7 +1118,9 @@ int qemuMonitorNBDServerStart(qemuMonitorPtr mon,
     ATTRIBUTE_NONNULL(2);
 int qemuMonitorNBDServerAdd(qemuMonitorPtr mon,
                             const char *deviceID,
-                            bool writable);
+                            const char *export,
+                            bool writable,
+                            const char *bitmap);
 int qemuMonitorNBDServerStop(qemuMonitorPtr);
 int qemuMonitorGetTPMModels(qemuMonitorPtr mon,
                             char ***tpmmodels);
diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
index 8f92e6de35..85d8f00fc0 100644
--- a/src/qemu/qemu_monitor_json.h
+++ b/src/qemu/qemu_monitor_json.h
@@ -463,7 +463,9 @@ int qemuMonitorJSONNBDServerStart(qemuMonitorPtr mon,
                                   const char *tls_alias);
 int qemuMonitorJSONNBDServerAdd(qemuMonitorPtr mon,
                                 const char *deviceID,
-                                bool writable);
+                                const char *export,
+                                bool writable,
+                                const char *bitmap);
 int qemuMonitorJSONNBDServerStop(qemuMonitorPtr mon);
 int qemuMonitorJSONGetTPMModels(qemuMonitorPtr mon,
                                 char ***tpmmodels)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 267a729c6f..a62cb668fe 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -424,7 +424,7 @@ qemuMigrationDstStartNBDServer(virQEMUDriverPtr driver,
                 goto exit_monitor;
         }

-        if (qemuMonitorNBDServerAdd(priv->mon, diskAlias, true) < 0)
+        if (qemuMonitorNBDServerAdd(priv->mon, diskAlias, NULL, true, NULL) < 0)
             goto exit_monitor;
         if (qemuDomainObjExitMonitor(driver, vm) < 0)
             goto cleanup;
diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index a371f7d425..39df201eca 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -3945,13 +3945,17 @@ qemuMonitorNBDServerStart(qemuMonitorPtr mon,
 int
 qemuMonitorNBDServerAdd(qemuMonitorPtr mon,
                         const char *deviceID,
-                        bool writable)
+                        const char *export,
+                        bool writable,
+                        const char *bitmap)
 {
-    VIR_DEBUG("deviceID=%s", deviceID);
+    VIR_DEBUG("deviceID=%s, export=%s, bitmap=%s", deviceID, NULLSTR(export),
+              NULLSTR(bitmap));

     QEMU_CHECK_MONITOR(mon);

-    return qemuMonitorJSONNBDServerAdd(mon, deviceID, writable);
+    return qemuMonitorJSONNBDServerAdd(mon, deviceID, export, writable,
+                                       bitmap);
 }


diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 41eef0c38c..6b66f6ef55 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -6736,15 +6736,20 @@ qemuMonitorJSONNBDServerStart(qemuMonitorPtr mon,
 int
 qemuMonitorJSONNBDServerAdd(qemuMonitorPtr mon,
                             const char *deviceID,
-                            bool writable)
+                            const char *export,
+                            bool writable,
+                            const char *bitmap)
 {
     int ret = -1;
     virJSONValuePtr cmd;
     virJSONValuePtr reply = NULL;

+    /* Note: bitmap must be NULL if QEMU_CAPS_NBD_BITMAP is lacking */
     if (!(cmd = qemuMonitorJSONMakeCommand("nbd-server-add",
                                            "s:device", deviceID,
+                                           "S:name", export,
                                            "b:writable", writable,
+                                           "S:bitmap", bitmap,
                                            NULL)))
         return ret;

diff --git a/tests/qemumonitorjsontest.c b/tests/qemumonitorjsontest.c
index 9d707fcc7c..2a9e6cc75f 100644
--- a/tests/qemumonitorjsontest.c
+++ b/tests/qemumonitorjsontest.c
@@ -1348,7 +1348,7 @@ GEN_TEST_FUNC(qemuMonitorJSONBlockCommit, "vdb", "/foo/bar1", "/foo/bar2", "back
 GEN_TEST_FUNC(qemuMonitorJSONDrivePivot, "vdb")
 GEN_TEST_FUNC(qemuMonitorJSONScreendump, "devicename", 1, "/foo/bar")
 GEN_TEST_FUNC(qemuMonitorJSONOpenGraphics, "spice", "spicefd", false)
-GEN_TEST_FUNC(qemuMonitorJSONNBDServerAdd, "vda", true)
+GEN_TEST_FUNC(qemuMonitorJSONNBDServerAdd, "vda", NULL, true, NULL)
 GEN_TEST_FUNC(qemuMonitorJSONDetachCharDev, "serial1")
 GEN_TEST_FUNC(qemuMonitorJSONBlockdevTrayOpen, "foodev", true)
 GEN_TEST_FUNC(qemuMonitorJSONBlockdevTrayClose, "foodev")
-- 
2.20.1