Simplify the Xen domain get OS type driver method

Make xenUnifiedDomainGetOSType directly call either the
xenHypervisorDomainGetOSType or xenDaemonDomainGetOSType
method depending on whether the domain is active or not.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

src/xen/xen_driver.c

@@ -793,18 +793,21 @@ static char *
 xenUnifiedDomainGetOSType(virDomainPtr dom)
 {
     xenUnifiedPrivatePtr priv = dom->conn->privateData;
-    int i;
-    char *ret;
 
-    for (i = 0; i < XEN_UNIFIED_NR_DRIVERS; ++i)
-        if (priv->opened[i] && drivers[i]->xenDomainGetOSType) {
-            ret = drivers[i]->xenDomainGetOSType(dom);
-            if (ret) return ret;
+    if (dom->id < 0) {
+        if (priv->xendConfigVersion < XEND_CONFIG_VERSION_3_0_4) {
+            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                           _("Unable to query OS type for inactive domain"));
+            return NULL;
+        } else {
+            return xenDaemonDomainGetOSType(dom);
         }
-
-    return NULL;
+    } else {
+        return xenHypervisorDomainGetOSType(dom);
+    }
 }
 
+
 static unsigned long long
 xenUnifiedDomainGetMaxMemory(virDomainPtr dom)
 {

src/xen/xen_driver.h

@@ -94,7 +94,6 @@ extern int xenRegister (void);
  */
 struct xenUnifiedDriver {
     virDrvConnectGetHostname xenGetHostname;
-    virDrvDomainGetOSType xenDomainGetOSType;
     virDrvDomainGetMaxMemory xenDomainGetMaxMemory;
     virDrvDomainSetMaxMemory xenDomainSetMaxMemory;
     virDrvDomainSetMemory xenDomainSetMemory;

src/xen/xen_hypervisor.c

@@ -873,7 +873,6 @@ typedef struct xen_op_v2_dom xen_op_v2_dom;
 static unsigned long long xenHypervisorGetMaxMemory(virDomainPtr domain);
 
 struct xenUnifiedDriver xenHypervisorDriver = {
-    .xenDomainGetOSType = xenHypervisorDomainGetOSType,
     .xenDomainGetMaxMemory = xenHypervisorGetMaxMemory,
     .xenDomainSetMaxMemory = xenHypervisorSetMaxMemory,
     .xenDomainGetInfo = xenHypervisorGetDomainInfo,
@@ -2613,9 +2612,7 @@ xenHypervisorDomainGetOSType(virDomainPtr dom)
     /* HV's earlier than 3.1.0 don't include the HVM flags in guests status*/
     if (hv_versions.hypervisor < 2 ||
         hv_versions.dom_interface < 4) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                       _("unsupported in dom interface < 4"));
-        return NULL;
+        return xenDaemonDomainGetOSType(dom);
     }
 
     XEN_GETDOMAININFO_CLEAR(dominfo);

src/xen/xend_internal.c

@@ -1373,15 +1373,11 @@ xenDaemonDomainDestroy(virDomainPtr domain)
  * Returns the new string or NULL in case of error, the string must be
  *         freed by the caller.
  */
-static char *
+char *
 xenDaemonDomainGetOSType(virDomainPtr domain)
 {
     char *type;
     struct sexpr *root;
-    xenUnifiedPrivatePtr priv = domain->conn->privateData;
-
-    if (domain->id < 0 && priv->xendConfigVersion < XEND_CONFIG_VERSION_3_0_4)
-        return NULL;
 
     /* can we ask for a subset ? worth it ? */
     root = sexpr_get(domain->conn, "/xend/domain/%s?detail=1", domain->name);
@@ -3441,7 +3437,6 @@ xenDaemonDomainBlockPeek(virDomainPtr domain,
 }
 
 struct xenUnifiedDriver xenDaemonDriver = {
-    .xenDomainGetOSType = xenDaemonDomainGetOSType,
     .xenDomainGetMaxMemory = xenDaemonDomainGetMaxMemory,
     .xenDomainSetMaxMemory = xenDaemonDomainSetMaxMemory,
     .xenDomainSetMemory = xenDaemonDomainSetMemory,

src/xen/xend_internal.h

@@ -108,6 +108,8 @@ char *xenDaemonDomainGetXMLDesc(virDomainPtr domain, unsigned int flags,
 unsigned long long xenDaemonDomainGetMaxMemory(virDomainPtr domain);
 char **xenDaemonListDomainsOld(virConnectPtr xend);
 
+char *xenDaemonDomainGetOSType(virDomainPtr domain);
+
 virDomainPtr xenDaemonDomainDefineXML(virConnectPtr xend, const char *sexpr);
 int xenDaemonDomainCreate(virDomainPtr domain);
 int xenDaemonDomainUndefine(virDomainPtr domain);

src/xen/xs_internal.c

@@ -53,12 +53,10 @@
 
 #define VIR_FROM_THIS VIR_FROM_XEN
 
-static char *xenStoreDomainGetOSType(virDomainPtr domain);
 static void xenStoreWatchEvent(int watch, int fd, int events, void *data);
 static void xenStoreWatchListFree(xenStoreWatchListPtr list);
 
 struct xenUnifiedDriver xenStoreDriver = {
-    .xenDomainGetOSType = xenStoreDomainGetOSType,
     .xenDomainGetMaxMemory = xenStoreDomainGetMaxMemory,
     .xenDomainSetMemory = xenStoreDomainSetMemory,
     .xenDomainGetInfo = xenStoreGetDomainInfo,
@@ -142,63 +140,6 @@ virDomainDoStoreWrite(virDomainPtr domain, const char *path, const char *value)
     return ret;
 }
 
-/**
- * virDomainGetVM:
- * @domain: a domain object
- *
- * Internal API extracting a xenstore vm path.
- *
- * Returns the new string or NULL in case of error
- */
-static char *
-virDomainGetVM(virDomainPtr domain)
-{
-    char *vm;
-    char query[200];
-    unsigned int len;
-    xenUnifiedPrivatePtr priv = domain->conn->privateData;
-
-    if (priv->xshandle == NULL)
-        return NULL;
-
-    snprintf(query, 199, "/local/domain/%d/vm", virDomainGetID(domain));
-    query[199] = 0;
-
-    vm = xs_read(priv->xshandle, 0, &query[0], &len);
-
-    return vm;
-}
-
-/**
- * virDomainGetVMInfo:
- * @domain: a domain object
- * @vm: the xenstore vm path
- * @name: the value's path
- *
- * Internal API extracting one information the device used
- * by the domain from xensttore
- *
- * Returns the new string or NULL in case of error
- */
-static char *
-virDomainGetVMInfo(virDomainPtr domain, const char *vm, const char *name)
-{
-    char s[256];
-    char *ret = NULL;
-    unsigned int len = 0;
-    xenUnifiedPrivatePtr priv = domain->conn->privateData;
-
-    if (priv->xshandle == NULL)
-        return NULL;
-
-    snprintf(s, 255, "%s/%s", vm, name);
-    s[255] = 0;
-
-    ret = xs_read(priv->xshandle, 0, &s[0], &len);
-
-    return ret;
-}
-
 
 /************************************************************************
  *									*
@@ -579,32 +520,6 @@ xenStoreListDomains(virConnectPtr conn, int *ids, int maxids)
 }
 
 
-/*
- * xenStoreDomainGetOSType:
- * @domain: a domain object
- *
- * Get the type of domain operation system.
- *
- * Returns the new string or NULL in case of error, the string must be
- *         freed by the caller.
- */
-static char *
-xenStoreDomainGetOSType(virDomainPtr domain)
-{
-    char *vm, *str = NULL;
-
-    vm = virDomainGetVM(domain);
-    if (vm) {
-        xenUnifiedPrivatePtr priv = domain->conn->privateData;
-        xenUnifiedLock(priv);
-        str = virDomainGetVMInfo(domain, vm, "image/ostype");
-        xenUnifiedUnlock(priv);
-        VIR_FREE(vm);
-    }
-
-    return str;
-}
-
 /**
  * xenStoreDomainGetVNCPort:
  * @conn: the hypervisor connection