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[NTOSKRNL] When allocating a new BCB, save it in a list

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This list is stored in the shared map. Later, this will allow
reusing BCB when appropriate
This commit is contained in:
Pierre Schweitzer 2018-09-02 14:37:47 +02:00
parent ea5912e4d1
commit e17f61138c
No known key found for this signature in database
GPG key ID: 7545556C3D585B0B
3 changed files with 25 additions and 1 deletions
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22
ntoskrnl/cc/pin.c
View file

@ -51,6 +51,7 @@ CcMapData (
NTSTATUS Status;
PINTERNAL_BCB iBcb;
LONGLONG ROffset;
KIRQL OldIrql;
DPRINT("CcMapData(FileObject 0x%p, FileOffset %I64x, Length %lu, Flags 0x%lx,"
" pBcb 0x%p, pBuffer 0x%p)\n", FileObject, FileOffset->QuadPart,
@ -156,6 +157,10 @@ CcMapData (
ExInitializeResourceLite(&iBcb->Lock);
*pBcb = (PVOID)iBcb;
KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
InsertTailList(&SharedCacheMap->BcbList, &iBcb->BcbEntry);
KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%p Length=%lu Flags=0x%lx -> TRUE Bcb=%p\n",
FileObject, FileOffset, Length, Flags, iBcb);
return TRUE;
@ -340,12 +345,20 @@ CcUnpinDataForThread (
if (--iBcb->RefCount == 0)
{
CcRosReleaseVacb(iBcb->Vacb->SharedCacheMap,
KIRQL OldIrql;
PROS_SHARED_CACHE_MAP SharedCacheMap;
SharedCacheMap = iBcb->Vacb->SharedCacheMap;
CcRosReleaseVacb(SharedCacheMap,
iBcb->Vacb,
TRUE,
iBcb->Dirty,
FALSE);
KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
RemoveEntryList(&iBcb->BcbEntry);
KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
ExDeleteResourceLite(&iBcb->Lock);
ExFreeToNPagedLookasideList(&iBcbLookasideList, iBcb);
}
@ -377,6 +390,8 @@ CcUnpinRepinnedBcb (
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);
@ -408,12 +423,17 @@ CcUnpinRepinnedBcb (
ASSERT(iBcb->Vacb->PinCount == 0);
}
SharedCacheMap = iBcb->Vacb->SharedCacheMap;
CcRosReleaseVacb(iBcb->Vacb->SharedCacheMap,
iBcb->Vacb,
TRUE,
iBcb->Dirty,
FALSE);
KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
RemoveEntryList(&iBcb->BcbEntry);
KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
ExDeleteResourceLite(&iBcb->Lock);
ExFreeToNPagedLookasideList(&iBcbLookasideList, iBcb);
}

1
ntoskrnl/cc/view.c
View file

@ -1417,6 +1417,7 @@ CcRosInitializeFileCache (
InitializeListHead(&SharedCacheMap->PrivateList);
KeInitializeSpinLock(&SharedCacheMap->CacheMapLock);
InitializeListHead(&SharedCacheMap->CacheMapVacbListHead);
InitializeListHead(&SharedCacheMap->BcbList);
}
KeAcquireGuardedMutex(&ViewLock);

3
ntoskrnl/include/internal/cc.h
View file

@ -172,6 +172,7 @@ typedef struct _ROS_SHARED_CACHE_MAP
CSHORT NodeByteSize;
ULONG OpenCount;
LARGE_INTEGER FileSize;
LIST_ENTRY BcbList;
LARGE_INTEGER SectionSize;
PFILE_OBJECT FileObject;
ULONG DirtyPages;
@ -181,6 +182,7 @@ typedef struct _ROS_SHARED_CACHE_MAP
PVOID LazyWriteContext;
LIST_ENTRY PrivateList;
ULONG DirtyPageThreshold;
KSPIN_LOCK BcbSpinLock;
PRIVATE_CACHE_MAP PrivateCacheMap;
/* ROS specific */
@ -235,6 +237,7 @@ typedef struct _INTERNAL_BCB
BOOLEAN Dirty;
BOOLEAN Pinned;
CSHORT RefCount; /* (At offset 0x34 on WinNT4) */
LIST_ENTRY BcbEntry;
} INTERNAL_BCB, *PINTERNAL_BCB;
typedef struct _LAZY_WRITER