[PATCH v2 15/25] qemu: domain: Track backup job data in the status XML

[Peter Krempa <pkrempa@xxxxxxxxxx>]

Store the data of a backup job along with the index counter for new
backup jobs in the status XML. Currently we will support only one
backup job and thus there's no necessity to add arrays of jobs.

Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
 src/qemu/qemu_domain.c | 58 ++++++++++++++++++++++++++++++++++++++++++
 src/qemu/qemu_domain.h |  3 +++
 2 files changed, 61 insertions(+)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 980287d2a0..98d0dad861 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -62,6 +62,7 @@
 #include "locking/domain_lock.h"
 #include "virdomainsnapshotobjlist.h"
 #include "virdomaincheckpointobjlist.h"
+#include "backup_conf.h"

 #ifdef MAJOR_IN_MKDEV
 # include <sys/mkdev.h>
@@ -2236,6 +2237,9 @@ qemuDomainObjPrivateDataClear(qemuDomainObjPrivatePtr priv)
     priv->pflash0 = NULL;
     virObjectUnref(priv->pflash1);
     priv->pflash1 = NULL;
+
+    virDomainBackupDefFree(priv->backup);
+    priv->backup = NULL;
 }


@@ -2643,6 +2647,26 @@ qemuDomainObjPrivateXMLFormatBlockjobs(virBufferPtr buf,
 }


+static int
+qemuDomainObjPrivateXMLFormatBackups(virBufferPtr buf,
+                                     virDomainObjPtr vm)
+{
+    qemuDomainObjPrivatePtr priv = vm->privateData;
+    g_auto(virBuffer) attrBuf = VIR_BUFFER_INITIALIZER;
+    g_auto(virBuffer) childBuf = VIR_BUFFER_INIT_CHILD(buf);
+
+    if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_INCREMENTAL_BACKUP))
+        return 0;
+
+    if (priv->backup &&
+        virDomainBackupDefFormat(&childBuf, priv->backup, true) < 0)
+        return -1;
+
+    virXMLFormatElement(buf, "backups", &attrBuf, &childBuf);
+    return 0;
+}
+
+
 void
 qemuDomainObjPrivateXMLFormatAllowReboot(virBufferPtr buf,
                                          virTristateBool allowReboot)
@@ -2938,6 +2962,9 @@ qemuDomainObjPrivateXMLFormat(virBufferPtr buf,

     virBufferAsprintf(buf, "<agentTimeout>%i</agentTimeout>\n", priv->agentTimeout);

+    if (qemuDomainObjPrivateXMLFormatBackups(buf, vm) < 0)
+        return -1;
+
     return 0;
 }

@@ -3311,6 +3338,34 @@ qemuDomainObjPrivateXMLParseBlockjobs(virDomainObjPtr vm,
 }


+static int
+qemuDomainObjPrivateXMLParseBackups(qemuDomainObjPrivatePtr priv,
+                                    xmlXPathContextPtr ctxt)
+{
+    g_autofree xmlNodePtr *nodes = NULL;
+    ssize_t nnodes = 0;
+
+    if ((nnodes = virXPathNodeSet("./backups/domainbackup", ctxt, &nodes)) < 0)
+        return -1;
+
+    if (nnodes > 1) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("only one backup job is supported"));
+        return -1;
+    }
+
+    if (nnodes == 0)
+        return 0;
+
+    if (!(priv->backup = virDomainBackupDefParseNode(ctxt->doc, nodes[0],
+                                                     priv->driver->xmlopt,
+                                                     VIR_DOMAIN_BACKUP_PARSE_INTERNAL)))
+        return -1;
+
+    return 0;
+}
+
+
 int
 qemuDomainObjPrivateXMLParseAllowReboot(xmlXPathContextPtr ctxt,
                                         virTristateBool *allowReboot)
@@ -3740,6 +3795,9 @@ qemuDomainObjPrivateXMLParse(xmlXPathContextPtr ctxt,
     if (qemuDomainObjPrivateXMLParseBlockjobs(vm, priv, ctxt) < 0)
         goto error;

+    if (qemuDomainObjPrivateXMLParseBackups(priv, ctxt) < 0)
+        goto error;
+
     qemuDomainStorageIdReset(priv);
     if (virXPathULongLong("string(./nodename/@index)", ctxt,
                           &priv->nodenameindex) == -2) {
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index 4cd7eec4ce..e07c8aa58f 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -414,6 +414,9 @@ struct _qemuDomainObjPrivate {
      * commandline for pflash drives. */
     virStorageSourcePtr pflash0;
     virStorageSourcePtr pflash1;
+
+    /* running backup job */
+    virDomainBackupDefPtr backup;
 };

 #define QEMU_DOMAIN_PRIVATE(vm) \
-- 
2.23.0

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