[libvirt] [PATCH 13/21] qemu: domain: Track backup job data in the status XML

[Peter Krempa]

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 at redhat.com>
---
 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 344601c8d6..a4c9ac11be 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 eb3faeb761..54397643d9 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 jobs. */
+    virDomainBackupDefPtr backup;
 };

 #define QEMU_DOMAIN_PRIVATE(vm) \
-- 
2.23.0