[libvirt] [PATCH 11/15] qemu: domain: Add private data for NBD migration storage source definition
Peter Krempa
pkrempa at redhat.com
Fri May 18 11:29:01 UTC 2018
Allow saving various aspects necessary to do NBD migration via blockdev
by storing a 'virStorageSource' in the disk private data meant to store
the NBD target of migration. Along with this add code to parse and
format it into the status XML.
Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
src/qemu/qemu_domain.c | 162 ++++++++++++++++++++++++++++++++++++++++++++++---
src/qemu/qemu_domain.h | 1 +
2 files changed, 156 insertions(+), 7 deletions(-)
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 94a9c5d1bc..632c025bef 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -1015,6 +1015,7 @@ qemuDomainDiskPrivateDispose(void *obj)
qemuDomainDiskPrivatePtr priv = obj;
VIR_FREE(priv->blockJobError);
+ virStorageSourceFree(priv->migrSource);
}
static virClassPtr qemuDomainStorageSourcePrivateClass;
@@ -2067,20 +2068,82 @@ qemuDomainObjPrivateXMLFormatPR(virBufferPtr buf,
}
-static void
+static int
+qemuDomainObjPrivateXMLFormatNBDMigrationSource(virBufferPtr buf,
+ virStorageSourcePtr src)
+{
+ virBuffer attrBuf = VIR_BUFFER_INITIALIZER;
+ virBuffer childBuf = VIR_BUFFER_INITIALIZER;
+ virBuffer privateDataBuf = VIR_BUFFER_INITIALIZER;
+ int ret = -1;
+
+ virBufferSetChildIndent(&childBuf, buf);
+ virBufferSetChildIndent(&privateDataBuf, &childBuf);
+
+ virBufferAsprintf(&attrBuf, " type='%s' format='%s'",
+ virStorageTypeToString(src->type),
+ virStorageFileFormatTypeToString(src->format));
+
+ if (virDomainStorageSourceFormat(&attrBuf, &childBuf, src,
+ VIR_DOMAIN_DEF_FORMAT_STATUS, false) < 0)
+ goto cleanup;
+
+ if (qemuStorageSourcePrivateDataFormat(src, &privateDataBuf) < 0)
+ goto cleanup;
+
+ if (virXMLFormatElement(&childBuf, "privateData", NULL, &privateDataBuf) < 0)
+ goto cleanup;
+
+ if (virXMLFormatElement(buf, "migrationSource", &attrBuf, &childBuf) < 0)
+ goto cleanup;
+
+ ret = 0;
+
+ cleanup:
+ virBufferFreeAndReset(&attrBuf);
+ virBufferFreeAndReset(&childBuf);
+ virBufferFreeAndReset(&privateDataBuf);
+
+ return ret;
+}
+
+
+static int
qemuDomainObjPrivateXMLFormatNBDMigration(virBufferPtr buf,
virDomainObjPtr vm)
{
+ virBuffer attrBuf = VIR_BUFFER_INITIALIZER;
+ virBuffer childBuf = VIR_BUFFER_INITIALIZER;
size_t i;
virDomainDiskDefPtr disk;
qemuDomainDiskPrivatePtr diskPriv;
+ int ret = -1;
for (i = 0; i < vm->def->ndisks; i++) {
disk = vm->def->disks[i];
diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
- virBufferAsprintf(buf, "<disk dev='%s' migrating='%s'/>\n",
+
+ virBufferSetChildIndent(&childBuf, buf);
+
+ virBufferAsprintf(&attrBuf, " dev='%s' migrating='%s'",
disk->dst, diskPriv->migrating ? "yes" : "no");
+
+ if (diskPriv->migrSource &&
+ qemuDomainObjPrivateXMLFormatNBDMigrationSource(&childBuf,
+ diskPriv->migrSource) < 0)
+ goto cleanup;
+
+ if (virXMLFormatElement(buf, "disk", &attrBuf, &childBuf) < 0)
+ goto cleanup;
}
+
+ ret = 0;
+
+ cleanup:
+ virBufferFreeAndReset(&attrBuf);
+ virBufferFreeAndReset(&childBuf);
+
+ return ret;
}
@@ -2092,6 +2155,7 @@ qemuDomainObjPrivateXMLFormatJob(virBufferPtr buf,
virBuffer attrBuf = VIR_BUFFER_INITIALIZER;
virBuffer childBuf = VIR_BUFFER_INITIALIZER;
qemuDomainJob job = priv->job.active;
+ int ret = -1;
if (!qemuDomainTrackJob(job))
job = QEMU_JOB_NONE;
@@ -2115,13 +2179,23 @@ qemuDomainObjPrivateXMLFormatJob(virBufferPtr buf,
if (priv->job.asyncJob != QEMU_ASYNC_JOB_NONE)
virBufferAsprintf(&attrBuf, " flags='0x%lx'", priv->job.apiFlags);
- if (priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_OUT)
- qemuDomainObjPrivateXMLFormatNBDMigration(&childBuf, vm);
+ if (priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_OUT &&
+ qemuDomainObjPrivateXMLFormatNBDMigration(&childBuf, vm) < 0)
+ goto cleanup;
if (priv->job.migParams)
qemuMigrationParamsFormat(&childBuf, priv->job.migParams);
- return virXMLFormatElement(buf, "job", &attrBuf, &childBuf);
+ if (virXMLFormatElement(buf, "job", &attrBuf, &childBuf) < 0)
+ goto cleanup;
+
+ ret = 0;
+
+ cleanup:
+ virBufferFreeAndReset(&attrBuf);
+ virBufferFreeAndReset(&childBuf);
+
+ return ret;
}
@@ -2367,12 +2441,79 @@ qemuDomainObjPrivateXMLParsePR(xmlXPathContextPtr ctxt,
}
+static int
+qemuDomainObjPrivateXMLParseJobNBDSource(xmlNodePtr node,
+ xmlXPathContextPtr ctxt,
+ virDomainDiskDefPtr disk)
+{
+ xmlNodePtr savedNode = ctxt->node;
+ qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
+ virStorageSourcePtr migrSource = NULL;
+ char *format = NULL;
+ char *type = NULL;
+ int ret = -1;
+
+ ctxt->node = node;
+
+ if (!(ctxt->node = virXPathNode("./migrationSource", ctxt))) {
+ ret = 0;
+ goto cleanup;
+ }
+
+ if (VIR_ALLOC(migrSource) < 0)
+ goto cleanup;
+
+ if (!(type = virXMLPropString(ctxt->node, "type"))) {
+ virReportError(VIR_ERR_XML_ERROR, "%s",
+ _("missing storage source type"));
+ goto cleanup;
+ }
+
+ if (!(format = virXMLPropString(ctxt->node, "format"))) {
+ virReportError(VIR_ERR_XML_ERROR, "%s",
+ ("missing storage source format"));
+ goto cleanup;
+ }
+
+ if ((migrSource->type = virStorageTypeFromString(type)) <= 0) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("unknown storage source type '%s'"), type);
+ goto cleanup;
+ }
+
+ if ((migrSource->format = virStorageFileFormatTypeFromString(format)) <= 0) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("unknown storage source format '%s'"), format);
+ goto cleanup;
+ }
+
+ if (virDomainStorageSourceParse(ctxt->node, ctxt, migrSource,
+ VIR_DOMAIN_DEF_PARSE_STATUS) < 0)
+ goto cleanup;
+
+ if ((ctxt->node = virXPathNode("./privateData", ctxt)) &&
+ qemuStorageSourcePrivateDataParse(ctxt, migrSource) < 0)
+ goto cleanup;
+
+ VIR_STEAL_PTR(diskPriv->migrSource, migrSource);
+ ret = 0;
+
+ cleanup:
+ virStorageSourceFree(migrSource);
+ VIR_FREE(format);
+ VIR_FREE(type);
+ ctxt->node = savedNode;
+ return ret;
+}
+
+
static int
qemuDomainObjPrivateXMLParseJobNBD(virDomainObjPtr vm,
qemuDomainObjPrivatePtr priv,
xmlXPathContextPtr ctxt)
{
xmlNodePtr *nodes = NULL;
+ char *dst = NULL;
size_t i;
int n;
int ret = -1;
@@ -2387,11 +2528,17 @@ qemuDomainObjPrivateXMLParseJobNBD(virDomainObjPtr vm,
n = 0;
}
for (i = 0; i < n; i++) {
- char *dst = virXMLPropString(nodes[i], "dev");
virDomainDiskDefPtr disk;
- if (dst && (disk = virDomainDiskByName(vm->def, dst, false)))
+ if ((dst = virXMLPropString(nodes[i], "dev")) &&
+ (disk = virDomainDiskByName(vm->def, dst, false))) {
QEMU_DOMAIN_DISK_PRIVATE(disk)->migrating = true;
+
+ if (qemuDomainObjPrivateXMLParseJobNBDSource(nodes[i], ctxt,
+ disk) < 0)
+ goto cleanup;
+ }
+
VIR_FREE(dst);
}
}
@@ -2401,6 +2548,7 @@ qemuDomainObjPrivateXMLParseJobNBD(virDomainObjPtr vm,
cleanup:
VIR_FREE(nodes);
+ VIR_FREE(dst);
return ret;
}
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index 40d1d095a3..000d8fb8d7 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -370,6 +370,7 @@ struct _qemuDomainDiskPrivate {
bool blockJobSync; /* the block job needs synchronized termination */
bool migrating; /* the disk is being migrated */
+ virStorageSourcePtr migrSource; /* disk source object used for NBD migration */
/* information about the device */
bool tray; /* device has tray */
--
2.16.2
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