[libvirt] [PATCH v5 08/10] domain: Introduce virDomainIOThreadSchedDelId

[John Ferlan]

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.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/conf/domain_conf.c   | 20 ++++++++++++++++++++
 src/conf/domain_conf.h   |  1 +
 src/libvirt_private.syms |  1 +
 3 files changed, 22 insertions(+)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 9d4c916..5f99fbd 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -17455,6 +17455,24 @@ 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));
+            return;
+        }
+    }
+}
+
 virDomainPinDefPtr
 virDomainPinFind(virDomainPinDefPtr *def,
                  int npin,
@@ -20897,6 +20915,8 @@ virDomainDefFormatInternal(virDomainDefPtr def,
         virDomainThreadSchedParamPtr sp = &def->cputune.iothreadsched[i];
         char *ids = NULL;
 
+        if (virBitmapIsAllClear(sp->ids))
+            continue;
         if (!(ids = virBitmapFormat(sp->ids)))
             goto error;
         virBufferAsprintf(buf, "<iothreadsched iothreads='%s' scheduler='%s'",
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index f60f7a0..0761eee 100644
--- a/src/conf/domain_conf.h
+++ b/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);
 
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index f3d2c38..2042c8a 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -328,6 +328,7 @@ virDomainIOThreadIDAdd;
 virDomainIOThreadIDDefFree;
 virDomainIOThreadIDDel;
 virDomainIOThreadIDFind;
+virDomainIOThreadSchedDelId;
 virDomainLeaseDefFree;
 virDomainLeaseIndex;
 virDomainLeaseInsert;
-- 
2.1.0