[libvirt] [PATCH 3/5] domain_conf: Introducde virDomainObjListRenameAddNew() & virDomainObjListRenameRemove()

[Tomas Meszaros]

We just need to update the entry in the second hash table. Since commit 8728a56
we have two hash tables for the domain list so that we can do O(1) lookup
regardless of looking up by UUID or name. Since with renaming a domain UUID does
not change, we only need to update the second hash table, where domains are
referenced by their name.

We will call both functions from the qemuDomainRename().

Signed-off-by: Tomas Meszaros <exo at tty.sk>
---
 src/conf/domain_conf.c   | 35 +++++++++++++++++++++++++++++++++++
 src/conf/domain_conf.h   |  5 +++++
 src/libvirt_private.syms |  2 ++
 3 files changed, 42 insertions(+)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 6b557d1..c47ccf9 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -2848,6 +2848,41 @@ virDomainObjPtr virDomainObjListAdd(virDomainObjListPtr doms,
     return ret;
 }
 
+
+int
+virDomainObjListRenameAddNew(virDomainObjListPtr doms,
+                             virDomainObjPtr vm,
+                             const char *name)
+{
+    int ret = -1;
+    virObjectLock(doms);
+
+    /* Add new name into the hash table of domain names. */
+    if (virHashAddEntry(doms->objsName, name, vm) < 0)
+        goto cleanup;
+
+    /* Okay, this is crazy. virHashAddEntry() does not increment
+     * the refcounter of @vm, but virHashRemoveEntry() does
+     * decrement it. We need to work around it. */
+    virObjectRef(vm);
+
+    ret = 0;
+ cleanup:
+    virObjectUnlock(doms);
+    return ret;
+}
+
+
+int
+virDomainObjListRenameRemove(virDomainObjListPtr doms, const char *name)
+{
+    virObjectLock(doms);
+    virHashRemoveEntry(doms->objsName, name);
+    virObjectUnlock(doms);
+    return 0;
+}
+
+
 /*
  * Mark the running VM config as transient. Ensures transient hotplug
  * operations do not persist past shutdown.
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 0fe6b1a..719018f 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2545,6 +2545,11 @@ virDomainObjPtr virDomainObjListAdd(virDomainObjListPtr doms,
                                     virDomainXMLOptionPtr xmlopt,
                                     unsigned int flags,
                                     virDomainDefPtr *oldDef);
+int virDomainObjListRenameAddNew(virDomainObjListPtr doms,
+                                 virDomainObjPtr vm,
+                                 const char *name);
+int virDomainObjListRenameRemove(virDomainObjListPtr doms,
+                                 const char *name);
 void virDomainObjAssignDef(virDomainObjPtr domain,
                            virDomainDefPtr def,
                            bool live,
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index ff322d6..70ef880 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -408,6 +408,8 @@ virDomainObjListNew;
 virDomainObjListNumOfDomains;
 virDomainObjListRemove;
 virDomainObjListRemoveLocked;
+virDomainObjListRenameAddNew;
+virDomainObjListRenameRemove;
 virDomainObjNew;
 virDomainObjParseNode;
 virDomainObjSetDefTransient;
-- 
2.1.0