/* FUNCTIONS *****************************************************************/
+static
+PINTERNAL_BCB
+NTAPI
+CcpFindBcb(
+ IN PROS_SHARED_CACHE_MAP SharedCacheMap,
+ IN PLARGE_INTEGER FileOffset,
+ IN ULONG Length,
+ IN BOOLEAN Pinned)
+{
+ PINTERNAL_BCB Bcb;
+ BOOLEAN Found = FALSE;
+ PLIST_ENTRY NextEntry;
+
+ for (NextEntry = SharedCacheMap->BcbList.Flink;
+ NextEntry != &SharedCacheMap->BcbList;
+ NextEntry = NextEntry->Flink)
+ {
+ Bcb = CONTAINING_RECORD(NextEntry, INTERNAL_BCB, BcbEntry);
+
+ if (Bcb->PFCB.MappedFileOffset.QuadPart <= FileOffset->QuadPart &&
+ (Bcb->PFCB.MappedFileOffset.QuadPart + Bcb->PFCB.MappedLength) >=
+ (FileOffset->QuadPart + Length))
+ {
+ if ((Pinned && Bcb->PinCount > 0) || (!Pinned && Bcb->PinCount == 0))
+ {
+ Found = TRUE;
+ break;
+ }
+ }
+ }
+
+ return (Found ? Bcb : NULL);
+}
+
static
BOOLEAN
NTAPI
CcpMapData(
- IN PFILE_OBJECT FileObject,
+ IN PROS_SHARED_CACHE_MAP SharedCacheMap,
IN PLARGE_INTEGER FileOffset,
IN ULONG Length,
IN ULONG Flags,
+ IN BOOLEAN ToPin,
OUT PVOID *pBcb,
OUT PVOID *pBuffer)
{
LONGLONG ReadOffset;
BOOLEAN Valid;
- PROS_SHARED_CACHE_MAP SharedCacheMap;
PROS_VACB Vacb;
NTSTATUS Status;
- PINTERNAL_BCB iBcb;
+ PINTERNAL_BCB iBcb, DupBcb;
LONGLONG ROffset;
KIRQL OldIrql;
ReadOffset = FileOffset->QuadPart;
- ASSERT(FileObject);
- ASSERT(FileObject->SectionObjectPointer);
- ASSERT(FileObject->SectionObjectPointer->SharedCacheMap);
-
- SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
- ASSERT(SharedCacheMap);
-
DPRINT("SectionSize %I64x, FileSize %I64x\n",
SharedCacheMap->SectionSize.QuadPart,
SharedCacheMap->FileSize.QuadPart);
if (ReadOffset % VACB_MAPPING_GRANULARITY + Length > VACB_MAPPING_GRANULARITY)
{
CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> FALSE\n",
- FileObject, FileOffset, Length, Flags);
+ SharedCacheMap->FileObject, FileOffset, Length, Flags);
return FALSE;
}
if (!NT_SUCCESS(Status))
{
CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> FALSE\n",
- FileObject, FileOffset, Length, Flags);
+ SharedCacheMap->FileObject, FileOffset, Length, Flags);
ExRaiseStatus(Status);
return FALSE;
}
{
CcRosReleaseVacb(SharedCacheMap, Vacb, FALSE, FALSE, FALSE);
CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> FALSE\n",
- FileObject, FileOffset, Length, Flags);
+ SharedCacheMap->FileObject, FileOffset, Length, Flags);
return FALSE;
}
{
CcRosReleaseVacb(SharedCacheMap, Vacb, FALSE, FALSE, FALSE);
CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> FALSE\n",
- FileObject, FileOffset, Length, Flags);
+ SharedCacheMap->FileObject, FileOffset, Length, Flags);
ExRaiseStatus(Status);
return FALSE;
}
{
CcRosReleaseVacb(SharedCacheMap, Vacb, TRUE, FALSE, FALSE);
CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> FALSE\n",
- FileObject, FileOffset, Length, Flags);
+ SharedCacheMap->FileObject, FileOffset, Length, Flags);
ExRaiseStatus(STATUS_INSUFFICIENT_RESOURCES);
return FALSE;
}
ExInitializeResourceLite(&iBcb->Lock);
*pBcb = (PVOID)iBcb;
- KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
- InsertTailList(&SharedCacheMap->BcbList, &iBcb->BcbEntry);
- KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
+ /* Only insert if we're not to pin data */
+ if (!ToPin)
+ {
+ KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
+
+ /* Check if we raced with another BCB creation */
+ DupBcb = CcpFindBcb(SharedCacheMap, FileOffset, Length, FALSE);
+ /* Yes, and we've lost */
+ if (DupBcb != NULL)
+ {
+ /* We'll return that BCB */
+ ++DupBcb->RefCount;
+
+ /* Delete the loser */
+ CcRosReleaseVacb(SharedCacheMap, Vacb, TRUE, FALSE, FALSE);
+ ExDeleteResourceLite(&iBcb->Lock);
+ ExFreeToNPagedLookasideList(&iBcbLookasideList, iBcb);
+
+ /* Return the winner - no need to update buffer address, it's
+ * relative to the VACB, which is unchanged.
+ */
+ *pBcb = DupBcb;
+ }
+ /* Nope, insert ourselves */
+ else
+ {
+ InsertTailList(&SharedCacheMap->BcbList, &iBcb->BcbEntry);
+ }
+ KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
+ }
+ else
+ {
+ InitializeListHead(&iBcb->BcbEntry);
+ }
return TRUE;
}
OUT PVOID *pBuffer)
{
BOOLEAN Ret;
+ KIRQL OldIrql;
+ PINTERNAL_BCB iBcb;
+ PROS_SHARED_CACHE_MAP SharedCacheMap;
DPRINT("CcMapData(FileObject 0x%p, FileOffset %I64x, Length %lu, Flags 0x%lx,"
" pBcb 0x%p, pBuffer 0x%p)\n", FileObject, FileOffset->QuadPart,
Length, Flags, pBcb, pBuffer);
+ ASSERT(FileObject);
+ ASSERT(FileObject->SectionObjectPointer);
+ ASSERT(FileObject->SectionObjectPointer->SharedCacheMap);
+
+ SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
+ ASSERT(SharedCacheMap);
+
if (Flags & MAP_WAIT)
{
++CcMapDataWait;
++CcMapDataNoWait;
}
- Ret = CcpMapData(FileObject, FileOffset, Length, Flags, pBcb, pBuffer);
+ KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
+ iBcb = CcpFindBcb(SharedCacheMap, FileOffset, Length, FALSE);
+ KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
+
+ if (iBcb == NULL)
+ {
+ Ret = CcpMapData(SharedCacheMap, FileOffset, Length, Flags, FALSE, pBcb, pBuffer);
+ }
+ else
+ {
+ ++iBcb->RefCount;
+ *pBcb = iBcb;
+ *pBuffer = (PUCHAR)iBcb->Vacb->BaseAddress + FileOffset->QuadPart % VACB_MAPPING_GRANULARITY;
+ Ret = TRUE;
+ }
CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> %d Bcb=%p\n",
FileObject, FileOffset, Length, Flags, Ret, *pBcb);
OUT PVOID * Bcb,
OUT PVOID * Buffer)
{
+ KIRQL OldIrql;
+ BOOLEAN Result;
+ PINTERNAL_BCB iBcb;
+ PROS_SHARED_CACHE_MAP SharedCacheMap;
+
CCTRACE(CC_API_DEBUG, "FileOffset=%p FileOffset=%p Length=%lu Flags=0x%lx\n",
FileObject, FileOffset, Length, Flags);
+ ASSERT(FileObject);
+ ASSERT(FileObject->SectionObjectPointer);
+ ASSERT(FileObject->SectionObjectPointer->SharedCacheMap);
+
+ SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
+ ASSERT(SharedCacheMap);
+
if (Flags & PIN_WAIT)
{
++CcPinReadWait;
++CcPinReadNoWait;
}
- /* Map first */
- if (!CcpMapData(FileObject, FileOffset, Length, Flags, Bcb, Buffer))
+ KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
+ iBcb = CcpFindBcb(SharedCacheMap, FileOffset, Length, TRUE);
+ KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
+
+ if (iBcb == NULL)
{
- return FALSE;
- }
+ /* We failed to find an already existing BCB */
+ if (BooleanFlagOn(Flags, PIN_IF_BCB))
+ {
+ return FALSE;
+ }
+
+ /* Map first */
+ if (!CcpMapData(SharedCacheMap, FileOffset, Length, Flags, TRUE, Bcb, Buffer))
+ {
+ return FALSE;
+ }
+
+ /* Pin then */
+ if (!CcPinMappedData(FileObject, FileOffset, Length, Flags, Bcb))
+ {
+ CcUnpinData(*Bcb);
+ return FALSE;
+ }
+
+ /* Did we race for the BCB creation? */
+ KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
+ iBcb = CcpFindBcb(SharedCacheMap, FileOffset, Length, TRUE);
+ if (iBcb != NULL)
+ {
+ KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
+
+ /* Free our now unused BCB */
+ CcUnpinData(*Bcb);
- /* Pin then */
- if (!CcPinMappedData(FileObject, FileOffset, Length, Flags, Bcb))
+ /* Lock the found BCB and return it */
+ if (BooleanFlagOn(Flags, PIN_EXCLUSIVE))
+ {
+ Result = ExAcquireResourceExclusiveLite(&iBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));
+ }
+ else
+ {
+ Result = ExAcquireSharedStarveExclusive(&iBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));
+ }
+
+ if (!Result)
+ {
+ return FALSE;
+ }
+
+ ++iBcb->PinCount;
+ ++iBcb->RefCount;
+
+ *Bcb = iBcb;
+ }
+ else
+ {
+ iBcb = *Bcb;
+
+ /* Insert ourselves in the linked list */
+ InsertTailList(&SharedCacheMap->BcbList, &iBcb->BcbEntry);
+ KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
+ }
+ }
+ /* We found a BCB, lock it and return it */
+ else
{
- CcUnpinData(*Bcb);
- return FALSE;
+ if (BooleanFlagOn(Flags, PIN_EXCLUSIVE))
+ {
+ Result = ExAcquireResourceExclusiveLite(&iBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));
+ }
+ else
+ {
+ Result = ExAcquireSharedStarveExclusive(&iBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));
+ }
+
+ if (!Result)
+ {
+ return FALSE;
+ }
+
+ ++iBcb->PinCount;
+ ++iBcb->RefCount;
+
+ *Bcb = iBcb;
+ *Buffer = (PUCHAR)iBcb->Vacb->BaseAddress + FileOffset->QuadPart % VACB_MAPPING_GRANULARITY;
}
return TRUE;
FALSE);
KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
- RemoveEntryList(&iBcb->BcbEntry);
+ if (!IsListEmpty(&iBcb->BcbEntry))
+ {
+ RemoveEntryList(&iBcb->BcbEntry);
+ }
KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
ExDeleteResourceLite(&iBcb->Lock);
FALSE);
KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
- RemoveEntryList(&iBcb->BcbEntry);
+ if (!IsListEmpty(&iBcb->BcbEntry))
+ {
+ RemoveEntryList(&iBcb->BcbEntry);
+ }
KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
ExDeleteResourceLite(&iBcb->Lock);
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