/* Counters:
* - Number of calls to CcMapData that could wait
* - Number of calls to CcMapData that couldn't wait
+ * - Number of calls to CcPinRead that could wait
+ * - Number of calls to CcPinRead that couldn't wait
*/
ULONG CcMapDataWait = 0;
ULONG CcMapDataNoWait = 0;
+ULONG CcPinReadWait = 0;
+ULONG CcPinReadNoWait = 0;
/* FUNCTIONS *****************************************************************/
-/*
- * @implemented
- */
+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
-CcMapData (
- IN PFILE_OBJECT FileObject,
+CcpMapData(
+ 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;
-
- 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);
-
- if (Flags & MAP_WAIT)
- {
- ++CcMapDataWait;
- }
- else
- {
- ++CcMapDataNoWait;
- }
+ 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);
- ExRaiseStatus(STATUS_INVALID_PARAMETER);
+ SharedCacheMap->FileObject, FileOffset, Length, Flags);
return FALSE;
}
+ if (!BooleanFlagOn(Flags, MAP_NO_READ))
+ {
+ static int Warned = 0;
+
+ SetFlag(Flags, MAP_NO_READ);
+ if (!Warned)
+ {
+ DPRINT1("Mapping/pinning with no read not implemented. Forcing read, might fail if wait not allowed\n");
+ Warned++;
+ }
+ }
+
ROffset = ROUND_DOWN(ReadOffset, VACB_MAPPING_GRANULARITY);
Status = CcRosRequestVacb(SharedCacheMap,
ROffset,
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;
}
- if (!Valid)
+ if (!Valid && BooleanFlagOn(Flags, MAP_NO_READ))
{
- if (!(Flags & MAP_WAIT))
+ if (!BooleanFlagOn(Flags, MAP_WAIT))
{
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;
}
iBcb->PFCB.MappedFileOffset = *FileOffset;
iBcb->Vacb = Vacb;
iBcb->Dirty = FALSE;
- iBcb->Pinned = FALSE;
+ iBcb->PinCount = 0;
iBcb->RefCount = 1;
ExInitializeResourceLite(&iBcb->Lock);
*pBcb = (PVOID)iBcb;
- CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> TRUE Bcb=%p\n",
- FileObject, FileOffset, Length, Flags, iBcb);
+ /* 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;
}
+/*
+ * @implemented
+ */
+BOOLEAN
+NTAPI
+CcMapData (
+ IN PFILE_OBJECT FileObject,
+ IN PLARGE_INTEGER FileOffset,
+ IN ULONG Length,
+ IN ULONG Flags,
+ OUT PVOID *pBcb,
+ 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;
+ }
+ else
+ {
+ ++CcMapDataNoWait;
+ }
+
+ 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);
+ return Ret;
+}
+
/*
* @unimplemented
*/
IN ULONG Flags,
OUT PVOID * Bcb)
{
+ BOOLEAN Result;
+ PINTERNAL_BCB iBcb;
PROS_SHARED_CACHE_MAP SharedCacheMap;
- CCTRACE(CC_API_DEBUG, "FileOffset=%p FileOffset=%p Length=%lu Flags=0x%lx\n",
+ CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx\n",
FileObject, FileOffset, Length, Flags);
ASSERT(FileObject);
SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
ASSERT(SharedCacheMap);
- ASSERT(SharedCacheMap->PinAccess);
+ if (!SharedCacheMap->PinAccess)
+ {
+ DPRINT1("FIXME: Pinning a file with no pin access!\n");
+ return FALSE;
+ }
- /* no-op for current implementation. */
- return TRUE;
+ iBcb = *Bcb;
+ ASSERT(iBcb->PinCount == 0);
+
+ iBcb->PinCount++;
+
+ if (BooleanFlagOn(Flags, PIN_EXCLUSIVE))
+ {
+ Result = ExAcquireResourceExclusiveLite(&iBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));
+ }
+ else
+ {
+ Result = ExAcquireSharedStarveExclusive(&iBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));
+ }
+
+ if (!Result)
+ {
+ iBcb->PinCount--;
+ }
+
+ return Result;
}
/*
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);
- if (CcMapData(FileObject, FileOffset, Length, Flags, Bcb, Buffer))
+ ASSERT(FileObject);
+ ASSERT(FileObject->SectionObjectPointer);
+ ASSERT(FileObject->SectionObjectPointer->SharedCacheMap);
+
+ SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
+ ASSERT(SharedCacheMap);
+
+ if (Flags & PIN_WAIT)
+ {
+ ++CcPinReadWait;
+ }
+ else
+ {
+ ++CcPinReadNoWait;
+ }
+
+ KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
+ iBcb = CcpFindBcb(SharedCacheMap, FileOffset, Length, TRUE);
+ KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
+
+ if (iBcb == NULL)
{
- if (CcPinMappedData(FileObject, FileOffset, Length, Flags, Bcb))
+ /* We failed to find an already existing BCB */
+ if (BooleanFlagOn(Flags, PIN_IF_BCB))
{
- iBcb = *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;
+ }
- ASSERT(iBcb->Pinned == 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);
- iBcb->Pinned = TRUE;
- iBcb->Vacb->PinCount++;
- CcRosReleaseVacbLock(iBcb->Vacb);
+ /* Free our now unused BCB */
+ CcUnpinData(*Bcb);
- if (Flags & PIN_EXCLUSIVE)
+ /* Lock the found BCB and return it */
+ if (BooleanFlagOn(Flags, PIN_EXCLUSIVE))
{
- ExAcquireResourceExclusiveLite(&iBcb->Lock, TRUE);
+ Result = ExAcquireResourceExclusiveLite(&iBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));
}
else
{
- ExAcquireResourceSharedLite(&iBcb->Lock, TRUE);
+ Result = ExAcquireSharedStarveExclusive(&iBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));
}
- return TRUE;
+ if (!Result)
+ {
+ return FALSE;
+ }
+
+ ++iBcb->PinCount;
+ ++iBcb->RefCount;
+
+ *Bcb = iBcb;
}
else
- CcUnpinData(*Bcb);
+ {
+ iBcb = *Bcb;
+
+ /* Insert ourselves in the linked list */
+ InsertTailList(&SharedCacheMap->BcbList, &iBcb->BcbEntry);
+ KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
+ }
}
- return FALSE;
+ /* We found a BCB, lock it and return it */
+ else
+ {
+ 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;
}
/*
Bcb, Lsn);
iBcb->Dirty = TRUE;
+ if (!iBcb->Vacb->Dirty)
+ {
+ CcRosMarkDirtyVacb(iBcb->Vacb);
+ }
}
CCTRACE(CC_API_DEBUG, "Bcb=%p ResourceThreadId=%lu\n", Bcb, ResourceThreadId);
- if (iBcb->Pinned)
+ if (iBcb->PinCount != 0)
{
ExReleaseResourceForThreadLite(&iBcb->Lock, ResourceThreadId);
- iBcb->Pinned = FALSE;
- CcRosAcquireVacbLock(iBcb->Vacb, NULL);
- iBcb->Vacb->PinCount--;
+ iBcb->PinCount--;
}
if (--iBcb->RefCount == 0)
{
- CcRosReleaseVacb(iBcb->Vacb->SharedCacheMap,
+ KIRQL OldIrql;
+ PROS_SHARED_CACHE_MAP SharedCacheMap;
+
+ ASSERT(iBcb->PinCount == 0);
+ SharedCacheMap = iBcb->Vacb->SharedCacheMap;
+ CcRosReleaseVacb(SharedCacheMap,
iBcb->Vacb,
TRUE,
iBcb->Dirty,
FALSE);
+ KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
+ if (!IsListEmpty(&iBcb->BcbEntry))
+ {
+ RemoveEntryList(&iBcb->BcbEntry);
+ }
+ KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
+
ExDeleteResourceLite(&iBcb->Lock);
ExFreeToNPagedLookasideList(&iBcbLookasideList, iBcb);
}
IN PIO_STATUS_BLOCK IoStatus)
{
PINTERNAL_BCB iBcb = Bcb;
+ KIRQL OldIrql;
+ PROS_SHARED_CACHE_MAP SharedCacheMap;
CCTRACE(CC_API_DEBUG, "Bcb=%p WriteThrough=%d\n", Bcb, WriteThrough);
IoStatus->Information = 0;
if (WriteThrough)
{
- CcRosAcquireVacbLock(iBcb->Vacb, NULL);
if (iBcb->Vacb->Dirty)
{
IoStatus->Status = CcRosFlushVacb(iBcb->Vacb);
{
IoStatus->Status = STATUS_SUCCESS;
}
- CcRosReleaseVacbLock(iBcb->Vacb);
}
else
{
IoStatus->Status = STATUS_SUCCESS;
}
- if (iBcb->Pinned)
+ if (iBcb->PinCount != 0)
{
ExReleaseResourceLite(&iBcb->Lock);
- iBcb->Pinned = FALSE;
- CcRosAcquireVacbLock(iBcb->Vacb, NULL);
- iBcb->Vacb->PinCount--;
+ iBcb->PinCount--;
+ ASSERT(iBcb->PinCount == 0);
+ }
+
+ SharedCacheMap = iBcb->Vacb->SharedCacheMap;
+ CcRosReleaseVacb(iBcb->Vacb->SharedCacheMap,
+ iBcb->Vacb,
+ TRUE,
+ iBcb->Dirty,
+ FALSE);
+
+ KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
+ if (!IsListEmpty(&iBcb->BcbEntry))
+ {
+ RemoveEntryList(&iBcb->BcbEntry);
}
+ KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
+
ExDeleteResourceLite(&iBcb->Lock);
ExFreeToNPagedLookasideList(&iBcbLookasideList, iBcb);
}
projects / reactos.git / blobdiff