This fixes various bugs linked to VACB counting:
- VACB not released when it should be
- Reference count expectations not being accurate
For the record, VACB should always have at least a reference
count of 1, unless you are to free it and removed it from
any linked list.
This commit also adds a bunch of asserts that should
help triggering invalid reference counting.
It should also fix numerous ASSERT currently triggered and
may help fixing random behaviours in Cc.
CORE-14285
CORE-14401
CORE-14293
- /* Still in use, it cannot be purged, fail */
- if (Vacb->ReferenceCount != 0 && !Vacb->Dirty)
+ /* Still in use, it cannot be purged, fail
+ * Allow one ref: VACB is supposed to be always 1-referenced
+ */
+ if ((Vacb->ReferenceCount > 1 && !Vacb->Dirty) ||
+ (Vacb->ReferenceCount > 2 && Vacb->Dirty))
{
Success = FALSE;
break;
}
/* This VACB is in range, so unlink it and mark for free */
{
Success = FALSE;
break;
}
/* This VACB is in range, so unlink it and mark for free */
+ ASSERT(Vacb->ReferenceCount == 1 || Vacb->Dirty);
RemoveEntryList(&Vacb->VacbLruListEntry);
if (Vacb->Dirty)
{
RemoveEntryList(&Vacb->VacbLruListEntry);
if (Vacb->Dirty)
{
Vacb = CONTAINING_RECORD(RemoveHeadList(&FreeList),
ROS_VACB,
CacheMapVacbListEntry);
Vacb = CONTAINING_RECORD(RemoveHeadList(&FreeList),
ROS_VACB,
CacheMapVacbListEntry);
+ CcRosVacbDecRefCount(Vacb);
CcRosInternalFreeVacb(Vacb);
}
CcRosInternalFreeVacb(Vacb);
}
iBcb->Pinned = FALSE;
CcRosAcquireVacbLock(iBcb->Vacb, NULL);
iBcb->Vacb->PinCount--;
iBcb->Pinned = FALSE;
CcRosAcquireVacbLock(iBcb->Vacb, NULL);
iBcb->Vacb->PinCount--;
+ ASSERT(iBcb->Vacb->PinCount == 0);
+
+ CcRosReleaseVacb(iBcb->Vacb->SharedCacheMap,
+ iBcb->Vacb,
+ TRUE,
+ iBcb->Dirty,
+ FALSE);
+
ExDeleteResourceLite(&iBcb->Lock);
ExFreeToNPagedLookasideList(&iBcbLookasideList, iBcb);
}
ExDeleteResourceLite(&iBcb->Lock);
ExFreeToNPagedLookasideList(&iBcbLookasideList, iBcb);
}
LIST_ENTRY CcCleanSharedCacheMapList;
#if DBG
LIST_ENTRY CcCleanSharedCacheMapList;
#if DBG
-static void CcRosVacbIncRefCount_(PROS_VACB vacb, const char* file, int line)
+VOID CcRosVacbIncRefCount_(PROS_VACB vacb, PCSTR file, INT line)
{
++vacb->ReferenceCount;
if (vacb->SharedCacheMap->Trace)
{
++vacb->ReferenceCount;
if (vacb->SharedCacheMap->Trace)
file, line, vacb, vacb->ReferenceCount, vacb->Dirty, vacb->PageOut);
}
}
file, line, vacb, vacb->ReferenceCount, vacb->Dirty, vacb->PageOut);
}
}
-static void CcRosVacbDecRefCount_(PROS_VACB vacb, const char* file, int line)
+VOID CcRosVacbDecRefCount_(PROS_VACB vacb, PCSTR file, INT line)
{
ASSERT(vacb->ReferenceCount != 0);
--vacb->ReferenceCount;
{
ASSERT(vacb->ReferenceCount != 0);
--vacb->ReferenceCount;
file, line, vacb, vacb->ReferenceCount, vacb->Dirty, vacb->PageOut);
}
}
file, line, vacb, vacb->ReferenceCount, vacb->Dirty, vacb->PageOut);
}
}
-#define CcRosVacbIncRefCount(vacb) CcRosVacbIncRefCount_(vacb,__FILE__,__LINE__)
-#define CcRosVacbDecRefCount(vacb) CcRosVacbDecRefCount_(vacb,__FILE__,__LINE__)
-#else
-#define CcRosVacbIncRefCount(vacb) (++((vacb)->ReferenceCount))
-#define CcRosVacbDecRefCount(vacb) (--((vacb)->ReferenceCount))
CcRosVacbDecRefCount(current);
/* Check if we can free this entry now */
CcRosVacbDecRefCount(current);
/* Check if we can free this entry now */
- if (current->ReferenceCount == 0)
+ if (current->ReferenceCount < 2)
{
ASSERT(!current->Dirty);
ASSERT(!current->MappedCount);
{
ASSERT(!current->Dirty);
ASSERT(!current->MappedCount);
+ ASSERT(current->ReferenceCount == 1);
RemoveEntryList(¤t->CacheMapVacbListEntry);
RemoveEntryList(¤t->VacbLruListEntry);
RemoveEntryList(¤t->CacheMapVacbListEntry);
RemoveEntryList(¤t->VacbLruListEntry);
current = CONTAINING_RECORD(current_entry,
ROS_VACB,
CacheMapVacbListEntry);
current = CONTAINING_RECORD(current_entry,
ROS_VACB,
CacheMapVacbListEntry);
+ CcRosVacbDecRefCount(current);
CcRosInternalFreeVacb(current);
}
CcRosInternalFreeVacb(current);
}
CcRosVacbIncRefCount(Vacb);
}
CcRosVacbIncRefCount(Vacb);
}
+ ASSERT(Vacb->ReferenceCount != 0);
+
CcRosReleaseVacbLock(Vacb);
return STATUS_SUCCESS;
CcRosReleaseVacbLock(Vacb);
return STATUS_SUCCESS;
KeBugCheck(CACHE_MANAGER);
}
KeBugCheck(CACHE_MANAGER);
}
- if (!Vacb->Dirty)
- {
- CcRosMarkDirtyVacb(Vacb);
- }
-
- CcRosReleaseVacbLock(Vacb);
+ CcRosReleaseVacb(SharedCacheMap, Vacb, Vacb->Valid, TRUE, FALSE);
+/*
+ * Note: this is not the contrary function of
+ * CcRosMapVacbInKernelSpace()
+ */
NTSTATUS
NTAPI
CcRosUnmapVacb (
NTSTATUS
NTAPI
CcRosUnmapVacb (
return STATUS_UNSUCCESSFUL;
}
return STATUS_UNSUCCESSFUL;
}
- if (NowDirty && !Vacb->Dirty)
- {
- CcRosMarkDirtyVacb(Vacb);
- }
-
ASSERT(Vacb->MappedCount != 0);
Vacb->MappedCount--;
ASSERT(Vacb->MappedCount != 0);
Vacb->MappedCount--;
- CcRosVacbDecRefCount(Vacb);
if (Vacb->MappedCount == 0)
{
CcRosVacbDecRefCount(Vacb);
}
if (Vacb->MappedCount == 0)
{
CcRosVacbDecRefCount(Vacb);
}
- CcRosReleaseVacbLock(Vacb);
+ CcRosReleaseVacb(SharedCacheMap, Vacb, Vacb->Valid, NowDirty, FALSE);
return STATUS_SUCCESS;
}
static
NTSTATUS
return STATUS_SUCCESS;
}
static
NTSTATUS
+CcRosMapVacbInKernelSpace(
PROS_VACB Vacb)
{
ULONG i;
PROS_VACB Vacb)
{
ULONG i;
current->MappedCount = 0;
current->DirtyVacbListEntry.Flink = NULL;
current->DirtyVacbListEntry.Blink = NULL;
current->MappedCount = 0;
current->DirtyVacbListEntry.Flink = NULL;
current->DirtyVacbListEntry.Blink = NULL;
- current->ReferenceCount = 1;
+ current->ReferenceCount = 0;
current->PinCount = 0;
KeInitializeMutex(¤t->Mutex, 0);
CcRosAcquireVacbLock(current, NULL);
current->PinCount = 0;
KeInitializeMutex(¤t->Mutex, 0);
CcRosAcquireVacbLock(current, NULL);
}
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
InsertTailList(&VacbLruListHead, ¤t->VacbLruListEntry);
}
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
InsertTailList(&VacbLruListHead, ¤t->VacbLruListEntry);
+ CcRosVacbIncRefCount(current);
KeReleaseGuardedMutex(&ViewLock);
MI_SET_USAGE(MI_USAGE_CACHE);
KeReleaseGuardedMutex(&ViewLock);
MI_SET_USAGE(MI_USAGE_CACHE);
- Status = CcRosMapVacb(current);
+ Status = CcRosMapVacbInKernelSpace(current);
if (!NT_SUCCESS(Status))
{
RemoveEntryList(¤t->CacheMapVacbListEntry);
if (!NT_SUCCESS(Status))
{
RemoveEntryList(¤t->CacheMapVacbListEntry);
+
+ CcRosVacbIncRefCount(current);
}
KeAcquireGuardedMutex(&ViewLock);
}
KeAcquireGuardedMutex(&ViewLock);
NULL);
MmUnlockAddressSpace(MmGetKernelAddressSpace());
NULL);
MmUnlockAddressSpace(MmGetKernelAddressSpace());
+ if (Vacb->PinCount != 0 || Vacb->ReferenceCount != 0)
+ {
+ DPRINT1("Invalid free: %ld, %ld\n", Vacb->ReferenceCount, Vacb->PinCount);
+ }
+
+ ASSERT(Vacb->PinCount == 0);
+ ASSERT(Vacb->ReferenceCount == 0);
ExFreeToNPagedLookasideList(&VacbLookasideList, Vacb);
return STATUS_SUCCESS;
}
ExFreeToNPagedLookasideList(&VacbLookasideList, Vacb);
return STATUS_SUCCESS;
}
{
current_entry = RemoveTailList(&FreeList);
current = CONTAINING_RECORD(current_entry, ROS_VACB, CacheMapVacbListEntry);
{
current_entry = RemoveTailList(&FreeList);
current = CONTAINING_RECORD(current_entry, ROS_VACB, CacheMapVacbListEntry);
+ CcRosVacbDecRefCount(current);
CcRosInternalFreeVacb(current);
}
CcRosInternalFreeVacb(current);
}
}
#define CcBugCheck(A, B, C) KeBugCheckEx(CACHE_MANAGER, BugCheckFileId | ((ULONG)(__LINE__)), A, B, C)
}
#define CcBugCheck(A, B, C) KeBugCheckEx(CACHE_MANAGER, BugCheckFileId | ((ULONG)(__LINE__)), A, B, C)
+
+#if DBG
+#define CcRosVacbIncRefCount(vacb) CcRosVacbIncRefCount_(vacb,__FILE__,__LINE__)
+#define CcRosVacbDecRefCount(vacb) CcRosVacbDecRefCount_(vacb,__FILE__,__LINE__)
+
+VOID
+CcRosVacbIncRefCount_(
+ PROS_VACB vacb,
+ PCSTR file,
+ INT line);
+
+VOID
+CcRosVacbDecRefCount_(
+ PROS_VACB vacb,
+ PCSTR file,
+ INT line);
+
+#else
+#define CcRosVacbIncRefCount(vacb) (++((vacb)->ReferenceCount))
+#define CcRosVacbDecRefCount(vacb) (--((vacb)->ReferenceCount))
+#endif