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util: Only have virObjectLock handle virObjectLockable

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Now that virObjectRWLockWrite exists to handle the virObjectRWLockable
objects, let's restore virObjectLock to only handle virObjectLockable
class locks. There still exists the possibility that the input @anyobj
isn't a valid object and the resource isn't truly locked, but that
also exists before commit id '77f4593b'.

This also restores some logic that commit id '77f4593b' removed
with respect to a common code path that commit id '10c2bb2b' had
introduced as virObjectGetLockableObj. This code path merely does
the same checks as the original virObjectLock commit 'b545f65d',
but in callable/reusable helper to ensure the @obj at least has
some validity before using.

Signed-off-by: John Ferlan <jferlan@redhat.com>
This commit is contained in:
John Ferlan 2017-07-28 10:14:40 -04:00
parent 908b33644e
commit 8b03a609dd
1 changed files with 23 additions and 14 deletions
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37
src/util/virobject.c
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@ -367,13 +367,28 @@ virObjectRef(void *anyobj)
}
static virObjectLockablePtr
virObjectGetLockableObj(void *anyobj)
{
virObjectPtr obj;
if (virObjectIsClass(anyobj, virObjectLockableClass))
return anyobj;
obj = anyobj;
VIR_WARN("Object %p (%s) is not a virObjectLockable instance",
anyobj, obj ? obj->klass->name : "(unknown)");
return NULL;
}
/**
* virObjectLock:
* @anyobj: any instance of virObjectLockable or virObjectRWLockable
*
* Acquire a lock on @anyobj. The lock must be released by
* virObjectUnlock. In case the passed object is instance of
* virObjectRWLockable a write lock is acquired.
* virObjectUnlock.
*
* The caller is expected to have acquired a reference
* on the object before locking it (eg virObjectRef).
@ -383,18 +398,12 @@ virObjectRef(void *anyobj)
void
virObjectLock(void *anyobj)
{
if (virObjectIsClass(anyobj, virObjectLockableClass)) {
virObjectLockablePtr obj = anyobj;
virMutexLock(&obj->lock);
} else if (virObjectIsClass(anyobj, virObjectRWLockableClass)) {
virObjectRWLockablePtr obj = anyobj;
virRWLockWrite(&obj->lock);
} else {
virObjectPtr obj = anyobj;
VIR_WARN("Object %p (%s) is not a virObjectLockable "
"nor virObjectRWLockable instance",
anyobj, obj ? obj->klass->name : "(unknown)");
}
virObjectLockablePtr obj = virObjectGetLockableObj(anyobj);
if (!obj)
return;
virMutexLock(&obj->lock);
}