conf: Add helper to return a bitmap of active iothread ids

src/conf/domain_conf.c

@@ -18411,6 +18411,35 @@ virDomainIOThreadIDAdd(virDomainDefPtr def,
     return NULL;
 }
 
+
+/*
+ * virDomainIOThreadIDMap:
+ * @def: domain definition
+ *
+ * Returns a map of active iothreads for @def.
+ */
+virBitmapPtr
+virDomainIOThreadIDMap(virDomainDefPtr def)
+{
+    unsigned int max = 0;
+    size_t i;
+    virBitmapPtr ret = NULL;
+
+    for (i = 0; i < def->niothreadids; i++) {
+        if (def->iothreadids[i]->iothread_id > max)
+            max = def->iothreadids[i]->iothread_id;
+    }
+
+    if (!(ret = virBitmapNew(max)))
+        return NULL;
+
+    for (i = 0; i < def->niothreadids; i++)
+        ignore_value(virBitmapSetBit(ret, def->iothreadids[i]->iothread_id));
+
+    return ret;
+}
+
+
 void
 virDomainIOThreadIDDel(virDomainDefPtr def,
                        unsigned int iothread_id)

src/conf/domain_conf.h

@@ -2728,6 +2728,9 @@ virDomainIOThreadIDDefPtr virDomainIOThreadIDFind(virDomainDefPtr def,
                                                   unsigned int iothread_id);
 virDomainIOThreadIDDefPtr virDomainIOThreadIDAdd(virDomainDefPtr def,
                                                  unsigned int iothread_id);
+
+virBitmapPtr virDomainIOThreadIDMap(virDomainDefPtr def)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
 void virDomainIOThreadIDDel(virDomainDefPtr def, unsigned int iothread_id);
 void virDomainIOThreadSchedDelId(virDomainDefPtr def, unsigned int iothread_id);
 

src/libvirt_private.syms

@@ -345,6 +345,7 @@ virDomainIOThreadIDAdd;
 virDomainIOThreadIDDefFree;
 virDomainIOThreadIDDel;
 virDomainIOThreadIDFind;
+virDomainIOThreadIDMap;
 virDomainIOThreadSchedDelId;
 virDomainKeyWrapCipherNameTypeFromString;
 virDomainKeyWrapCipherNameTypeToString;