domain: Introduce virDomainIOThreadSchedDelId

We're about to allow IOThreads to be deleted, but an iothreadid may be
included in some domain thread sched, so add a new API to allow removing
an iothread from some entry.

Then during the writing of the threadsched data and an additional check
to determine whether the bitmap is all clear before writing it out.

src/conf/domain_conf.c

@@ -17468,6 +17468,29 @@ virDomainIOThreadIDDel(virDomainDefPtr def,
     }
 }
 
+void
+virDomainIOThreadSchedDelId(virDomainDefPtr def,
+                            unsigned int iothreadid)
+{
+    size_t i;
+
+    if (!def->cputune.iothreadsched || !def->cputune.niothreadsched)
+        return;
+
+    for (i = 0; i < def->cputune.niothreadsched; i++) {
+        if (virBitmapIsBitSet(def->cputune.iothreadsched[i].ids, iothreadid)) {
+            ignore_value(virBitmapClearBit(def->cputune.iothreadsched[i].ids,
+                                           iothreadid));
+            if (virBitmapIsAllClear(def->cputune.iothreadsched[i].ids)) {
+                virBitmapFree(def->cputune.iothreadsched[i].ids);
+                VIR_DELETE_ELEMENT(def->cputune.iothreadsched, i,
+                                   def->cputune.niothreadsched);
+            }
+            return;
+        }
+    }
+}
+
 virDomainPinDefPtr
 virDomainPinFind(virDomainPinDefPtr *def,
                  int npin,

src/conf/domain_conf.h

@@ -2617,6 +2617,7 @@ virDomainIOThreadIDDefPtr virDomainIOThreadIDFind(virDomainDefPtr def,
 virDomainIOThreadIDDefPtr virDomainIOThreadIDAdd(virDomainDefPtr def,
                                                  unsigned int iothread_id);
 void virDomainIOThreadIDDel(virDomainDefPtr def, unsigned int iothread_id);
+void virDomainIOThreadSchedDelId(virDomainDefPtr def, unsigned int iothread_id);
 
 unsigned int virDomainDefFormatConvertXMLFlags(unsigned int flags);
 

src/libvirt_private.syms

@@ -328,6 +328,7 @@ virDomainIOThreadIDAdd;
 virDomainIOThreadIDDefFree;
 virDomainIOThreadIDDel;
 virDomainIOThreadIDFind;
+virDomainIOThreadSchedDelId;
 virDomainLeaseDefFree;
 virDomainLeaseIndex;
 virDomainLeaseInsert;