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[NTOSKRNL] When mapping data, try to find if there's already a BCB

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If so, return such BCB instead of creating a new one. This will
allow (at some point) to be more consistent in case of concurrent
mapping.

This fixes a few CcMapData tests.
This commit is contained in:
Pierre Schweitzer 2018-10-05 21:01:02 +02:00
parent f284947622
commit 9fc75c1132
No known key found for this signature in database
GPG key ID: 7545556C3D585B0B
1 changed files with 75 additions and 16 deletions
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91
ntoskrnl/cc/pin.c
View file

@ -35,7 +35,7 @@ static
BOOLEAN
NTAPI
CcpMapData(
IN PFILE_OBJECT FileObject,
IN PROS_SHARED_CACHE_MAP SharedCacheMap,
IN PLARGE_INTEGER FileOffset,
IN ULONG Length,
IN ULONG Flags,
@ -44,7 +44,6 @@ CcpMapData(
{
LONGLONG ReadOffset;
BOOLEAN Valid;
PROS_SHARED_CACHE_MAP SharedCacheMap;
PROS_VACB Vacb;
NTSTATUS Status;
PINTERNAL_BCB iBcb;
@ -53,13 +52,6 @@ CcpMapData(
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);
@ -67,7 +59,7 @@ CcpMapData(
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;
}
@ -92,7 +84,7 @@ CcpMapData(
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;
}
@ -103,7 +95,7 @@ CcpMapData(
{
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;
}
@ -112,7 +104,7 @@ CcpMapData(
{
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;
}
@ -124,7 +116,7 @@ CcpMapData(
{
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;
}
@ -148,6 +140,40 @@ CcpMapData(
return TRUE;
}
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);
}
/*
* @implemented
*/
@ -162,11 +188,21 @@ CcMapData (
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;
@ -176,7 +212,21 @@ CcMapData (
++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, 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);
@ -249,9 +299,18 @@ CcPinRead (
OUT PVOID * Bcb,
OUT PVOID * Buffer)
{
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;
@ -262,7 +321,7 @@ CcPinRead (
}
/* Map first */
if (!CcpMapData(FileObject, FileOffset, Length, Flags, Bcb, Buffer))
if (!CcpMapData(SharedCacheMap, FileOffset, Length, Flags, Bcb, Buffer))
{
return FALSE;
}