[PATCHv4 17/21] qemu: monitor: Add support for backing name specification for block-stream

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To allow changing the name that is recorded in the top of the current
image chain used in a block pull/rebase operation, we need to specify
the backing name to qemu. This is done via the "backing-file" attribute
to the block-stream commad.
---
 src/qemu/qemu_driver.c       |  8 ++++----
 src/qemu/qemu_migration.c    |  6 +++---
 src/qemu/qemu_monitor.c      | 12 +++++++-----
 src/qemu/qemu_monitor.h      |  3 ++-
 src/qemu/qemu_monitor_json.c | 15 +++++++++++++++
 src/qemu/qemu_monitor_json.h |  1 +
 6 files changed, 32 insertions(+), 13 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 61f2beb..88d44d3 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -14883,7 +14883,7 @@ qemuDomainBlockPivot(virConnectPtr conn,
     /* Probe the status, if needed.  */
     if (!disk->mirroring) {
         qemuDomainObjEnterMonitor(driver, vm);
-        rc = qemuMonitorBlockJob(priv->mon, device, NULL, 0, &info,
+        rc = qemuMonitorBlockJob(priv->mon, device, NULL, NULL, 0, &info,
                                   BLOCK_JOB_INFO, true);
         qemuDomainObjExitMonitor(driver, vm);
         if (rc < 0)
@@ -15100,7 +15100,7 @@ qemuDomainBlockJobImpl(virDomainObjPtr vm,
     qemuDomainObjEnterMonitor(driver, vm);
     ret = qemuMonitorBlockJob(priv->mon, device,
                               baseIndex ? baseSource->path : base,
-                              bandwidth, info, mode, async);
+                              NULL, bandwidth, info, mode, async);
     qemuDomainObjExitMonitor(driver, vm);
     if (ret < 0)
         goto endjob;
@@ -15142,8 +15142,8 @@ qemuDomainBlockJobImpl(virDomainObjPtr vm,
                 virDomainBlockJobInfo dummy;

                 qemuDomainObjEnterMonitor(driver, vm);
-                ret = qemuMonitorBlockJob(priv->mon, device, NULL, 0, &dummy,
-                                          BLOCK_JOB_INFO, async);
+                ret = qemuMonitorBlockJob(priv->mon, device, NULL, NULL, 0,
+                                          &dummy, BLOCK_JOB_INFO, async);
                 qemuDomainObjExitMonitor(driver, vm);

                 if (ret <= 0)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 842f782..30175f2 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -1308,7 +1308,7 @@ qemuMigrationDriveMirror(virQEMUDriverPtr driver,
                                _("canceled by client"));
                 goto error;
             }
-            mon_ret = qemuMonitorBlockJob(priv->mon, diskAlias, NULL, 0,
+            mon_ret = qemuMonitorBlockJob(priv->mon, diskAlias, NULL, NULL, 0,
                                           &info, BLOCK_JOB_INFO, true);
             qemuDomainObjExitMonitor(driver, vm);

@@ -1360,7 +1360,7 @@ qemuMigrationDriveMirror(virQEMUDriverPtr driver,
             continue;
         if (qemuDomainObjEnterMonitorAsync(driver, vm,
                                            QEMU_ASYNC_JOB_MIGRATION_OUT) == 0) {
-            if (qemuMonitorBlockJob(priv->mon, diskAlias, NULL, 0,
+            if (qemuMonitorBlockJob(priv->mon, diskAlias, NULL, NULL, 0,
                                     NULL, BLOCK_JOB_ABORT, true) < 0) {
                 VIR_WARN("Unable to cancel block-job on '%s'", diskAlias);
             }
@@ -1426,7 +1426,7 @@ qemuMigrationCancelDriveMirror(qemuMigrationCookiePtr mig,
                                            QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
             goto cleanup;

-        if (qemuMonitorBlockJob(priv->mon, diskAlias, NULL, 0,
+        if (qemuMonitorBlockJob(priv->mon, diskAlias, NULL, NULL, 0,
                                 NULL, BLOCK_JOB_ABORT, true) < 0)
             VIR_WARN("Unable to stop block job on %s", diskAlias);
         qemuDomainObjExitMonitor(driver, vm);
diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index 2c9e738..ed6368e 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -3354,6 +3354,7 @@ int qemuMonitorScreendump(qemuMonitorPtr mon,
 int qemuMonitorBlockJob(qemuMonitorPtr mon,
                         const char *device,
                         const char *base,
+                        const char *backingName,
                         unsigned long bandwidth,
                         virDomainBlockJobInfoPtr info,
                         qemuMonitorBlockJobCmd mode,
@@ -3362,9 +3363,10 @@ int qemuMonitorBlockJob(qemuMonitorPtr mon,
     int ret = -1;
     unsigned long long speed;

-    VIR_DEBUG("mon=%p, device=%s, base=%s, bandwidth=%luM, info=%p, mode=%o, "
-              "modern=%d", mon, device, NULLSTR(base), bandwidth, info, mode,
-              modern);
+    VIR_DEBUG("mon=%p, device=%s, base=%s, backingName=%s, bandwidth=%luM, "
+              "info=%p, mode=%o, modern=%d",
+              mon, device, NULLSTR(base), NULLSTR(backingName),
+              bandwidth, info, mode, modern);

     /* Convert bandwidth MiB to bytes - unfortunately the JSON QMP protocol is
      * limited to LLONG_MAX also for unsigned values */
@@ -3378,8 +3380,8 @@ int qemuMonitorBlockJob(qemuMonitorPtr mon,
     speed <<= 20;

     if (mon->json)
-        ret = qemuMonitorJSONBlockJob(mon, device, base, speed, info, mode,
-                                      modern);
+        ret = qemuMonitorJSONBlockJob(mon, device, base, backingName,
+                                      speed, info, mode, modern);
     else
         virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
                        _("block jobs require JSON monitor"));
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index 71b7d3c..460239c 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -691,7 +691,8 @@ typedef enum {

 int qemuMonitorBlockJob(qemuMonitorPtr mon,
                         const char *device,
-                        const char *back,
+                        const char *base,
+                        const char *backingName,
                         unsigned long bandwidth,
                         virDomainBlockJobInfoPtr info,
                         qemuMonitorBlockJobCmd mode,
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index b4cdd6d..dfe57f1 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -3766,6 +3766,7 @@ int
 qemuMonitorJSONBlockJob(qemuMonitorPtr mon,
                         const char *device,
                         const char *base,
+                        const char *backingName,
                         unsigned long long speed,
                         virDomainBlockJobInfoPtr info,
                         qemuMonitorBlockJobCmd mode,
@@ -3781,6 +3782,19 @@ qemuMonitorJSONBlockJob(qemuMonitorPtr mon,
                        _("only modern block pull supports base: %s"), base);
         return -1;
     }
+
+    if (backingName && mode != BLOCK_JOB_PULL) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("backing name is supported only for block pull"));
+        return -1;
+    }
+
+    if (backingName && !base) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("backing name requires a base image"));
+        return -1;
+    }
+
     if (speed && mode == BLOCK_JOB_PULL && !modern) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("only modern block pull supports speed: %llu"),
@@ -3815,6 +3829,7 @@ qemuMonitorJSONBlockJob(qemuMonitorPtr mon,
                                          "s:device", device,
                                          "P:speed", speed,
                                          "S:base", base,
+                                         "S:backing-file", backingName,
                                          NULL);
         break;
     }
diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
index 37ab325..7c9297c 100644
--- a/src/qemu/qemu_monitor_json.h
+++ b/src/qemu/qemu_monitor_json.h
@@ -284,6 +284,7 @@ int qemuMonitorJSONScreendump(qemuMonitorPtr mon,
 int qemuMonitorJSONBlockJob(qemuMonitorPtr mon,
                             const char *device,
                             const char *base,
+                            const char *backingName,
                             unsigned long long speed,
                             virDomainBlockJobInfoPtr info,
                             qemuMonitorBlockJobCmd mode,
-- 
1.9.3

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