[libvirt] [PATCH] domain_conf: drop unused ref-count in snapshot object

[Eric Blake]

The ref count was assigned to 1 at creation, then never modified again
until it was decremented just before freeing the object.

* src/conf/domain_conf.h (_virDomainSnapshotObj): Delete unused
field.
(virDomainSnapshotObjUnref): Delete unused prototype.
* src/libvirt_private.syms: Likewise.
* src/conf/domain_conf.c (virDomainSnapshotObjNew)
(virDomainSnapshotObjListDataFree): Update users.
(virDomainSnapshotObjUnref): Delete.
---

I was about to add ATTRIBUTE_RETURN_CHECK to all Unref methods,
when I discovered that this method is (currently) worthless.

If we ever change things in the future to have multiple threads
referring to snapshot objects and need a reference counter, we
can use Wen's proposed new base-class object to do that in a
saner manner.  In the meantime, let's just delete the bloat.

 src/conf/domain_conf.c   |   15 +--------------
 src/conf/domain_conf.h   |    3 ---
 src/libvirt_private.syms |    1 -
 3 files changed, 1 insertions(+), 18 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index c637300..1b02c25 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -8722,8 +8722,6 @@ static virDomainSnapshotObjPtr virDomainSnapshotObjNew(void)
         return NULL;
     }

-    snapshot->refs = 1;
-
     VIR_DEBUG("obj=%p", snapshot);

     return snapshot;
@@ -8740,17 +8738,6 @@ static void virDomainSnapshotObjFree(virDomainSnapshotObjPtr snapshot)
     VIR_FREE(snapshot);
 }

-int virDomainSnapshotObjUnref(virDomainSnapshotObjPtr snapshot)
-{
-    snapshot->refs--;
-    VIR_DEBUG("obj=%p refs=%d", snapshot, snapshot->refs);
-    if (snapshot->refs == 0) {
-        virDomainSnapshotObjFree(snapshot);
-        return 0;
-    }
-    return snapshot->refs;
-}
-
 virDomainSnapshotObjPtr virDomainSnapshotAssignDef(virDomainSnapshotObjListPtr snapshots,
                                                    const virDomainSnapshotDefPtr def)
 {
@@ -8782,7 +8769,7 @@ virDomainSnapshotObjListDataFree(void *payload,
 {
     virDomainSnapshotObjPtr obj = payload;

-    virDomainSnapshotObjUnref(obj);
+    virDomainSnapshotObjFree(obj);
 }

 int virDomainSnapshotObjListInit(virDomainSnapshotObjListPtr snapshots)
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index cbd0f98..9f595d6 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -998,8 +998,6 @@ struct _virDomainSnapshotDef {
 typedef struct _virDomainSnapshotObj virDomainSnapshotObj;
 typedef virDomainSnapshotObj *virDomainSnapshotObjPtr;
 struct _virDomainSnapshotObj {
-    int refs;
-
     virDomainSnapshotDefPtr def;
 };

@@ -1028,7 +1026,6 @@ virDomainSnapshotObjPtr virDomainSnapshotFindByName(const virDomainSnapshotObjLi
                                                     const char *name);
 void virDomainSnapshotObjListRemove(virDomainSnapshotObjListPtr snapshots,
                                     virDomainSnapshotObjPtr snapshot);
-int virDomainSnapshotObjUnref(virDomainSnapshotObjPtr snapshot);
 int virDomainSnapshotHasChildren(virDomainSnapshotObjPtr snap,
                                 virDomainSnapshotObjListPtr snapshots);

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 55be36e..b4b6c63 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -305,7 +305,6 @@ virDomainSnapshotHasChildren;
 virDomainSnapshotObjListGetNames;
 virDomainSnapshotObjListNum;
 virDomainSnapshotObjListRemove;
-virDomainSnapshotObjUnref;
 virDomainSoundDefFree;
 virDomainSoundModelTypeFromString;
 virDomainSoundModelTypeToString;
-- 
1.7.4