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reactos/ntoskrnl/cc/view.c
Thomas Faber 1d398057a3
[NTOS:CC] Access SectionObjectPointers without lock in CcRosInitializeFileCache. CORE-14691 
kmtest:NtCreateSection calls CcInitializeCacheMap with a
NULL value for SectionObjectPointers. This will cause an exception when
trying to access it, which in Windows can be handled gracefully.
However accessing it while holding ViewLock means the lock will not be
released, leading to an APC_INDEX_MISMATCH bugcheck.

This solves the problem by allocating SharedCacheMap outside the lock,
then freeing it again under lock if another thread has updated SharedCacheMap
in the mean time. This is also What Windows Does(TM).
2018-06-05 16:24:13 +02:00

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/cc/view.c
* PURPOSE: Cache manager
*
* PROGRAMMERS: David Welch (welch@mcmail.com)
* Pierre Schweitzer (pierre@reactos.org)
*/
/* NOTES **********************************************************************
*
* This is not the NT implementation of a file cache nor anything much like
* it.
*
* The general procedure for a filesystem to implement a read or write
* dispatch routine is as follows
*
* (1) If caching for the FCB hasn't been initiated then so do by calling
* CcInitializeFileCache.
*
* (2) For each 4k region which is being read or written obtain a cache page
* by calling CcRequestCachePage.
*
* (3) If either the page is being read or not completely written, and it is
* not up to date then read its data from the underlying medium. If the read
* fails then call CcReleaseCachePage with VALID as FALSE and return a error.
*
* (4) Copy the data into or out of the page as necessary.
*
* (5) Release the cache page
*/
/* INCLUDES ******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
#if defined (ALLOC_PRAGMA)
#pragma alloc_text(INIT, CcInitView)
#endif
/* GLOBALS *******************************************************************/
LIST_ENTRY DirtyVacbListHead;
static LIST_ENTRY VacbLruListHead;
KGUARDED_MUTEX ViewLock;
NPAGED_LOOKASIDE_LIST iBcbLookasideList;
static NPAGED_LOOKASIDE_LIST SharedCacheMapLookasideList;
static NPAGED_LOOKASIDE_LIST VacbLookasideList;
/* Internal vars (MS):
* - Threshold above which lazy writer will start action
* - Amount of dirty pages
* - List for deferred writes
* - Spinlock when dealing with the deferred list
* - List for "clean" shared cache maps
*/
ULONG CcDirtyPageThreshold = 0;
ULONG CcTotalDirtyPages = 0;
LIST_ENTRY CcDeferredWrites;
KSPIN_LOCK CcDeferredWriteSpinLock;
LIST_ENTRY CcCleanSharedCacheMapList;
#if DBG
ULONG CcRosVacbIncRefCount_(PROS_VACB vacb, PCSTR file, INT line)
{
ULONG Refs;
Refs = InterlockedIncrement((PLONG)&vacb->ReferenceCount);
if (vacb->SharedCacheMap->Trace)
{
DbgPrint("(%s:%i) VACB %p ++RefCount=%lu, Dirty %u, PageOut %lu\n",
file, line, vacb, Refs, vacb->Dirty, vacb->PageOut);
}
return Refs;
}
ULONG CcRosVacbDecRefCount_(PROS_VACB vacb, PCSTR file, INT line)
{
ULONG Refs;
Refs = InterlockedDecrement((PLONG)&vacb->ReferenceCount);
ASSERT(!(Refs == 0 && vacb->Dirty));
if (vacb->SharedCacheMap->Trace)
{
DbgPrint("(%s:%i) VACB %p --RefCount=%lu, Dirty %u, PageOut %lu\n",
file, line, vacb, Refs, vacb->Dirty, vacb->PageOut);
}
if (Refs == 0)
{
CcRosInternalFreeVacb(vacb);
}
return Refs;
}
ULONG CcRosVacbGetRefCount_(PROS_VACB vacb, PCSTR file, INT line)
{
ULONG Refs;
Refs = InterlockedCompareExchange((PLONG)&vacb->ReferenceCount, 0, 0);
if (vacb->SharedCacheMap->Trace)
{
DbgPrint("(%s:%i) VACB %p ==RefCount=%lu, Dirty %u, PageOut %lu\n",
file, line, vacb, Refs, vacb->Dirty, vacb->PageOut);
}
return Refs;
}
#endif
/* FUNCTIONS *****************************************************************/
VOID
NTAPI
CcRosTraceCacheMap (
PROS_SHARED_CACHE_MAP SharedCacheMap,
BOOLEAN Trace )
{
#if DBG
KIRQL oldirql;
PLIST_ENTRY current_entry;
PROS_VACB current;
if (!SharedCacheMap)
return;
SharedCacheMap->Trace = Trace;
if (Trace)
{
DPRINT1("Enabling Tracing for CacheMap 0x%p:\n", SharedCacheMap);
KeAcquireGuardedMutex(&ViewLock);
KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldirql);
current_entry = SharedCacheMap->CacheMapVacbListHead.Flink;
while (current_entry != &SharedCacheMap->CacheMapVacbListHead)
{
current = CONTAINING_RECORD(current_entry, ROS_VACB, CacheMapVacbListEntry);
current_entry = current_entry->Flink;
DPRINT1(" VACB 0x%p enabled, RefCount %lu, Dirty %u, PageOut %lu\n",
current, current->ReferenceCount, current->Dirty, current->PageOut );
}
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldirql);
KeReleaseGuardedMutex(&ViewLock);
}
else
{
DPRINT1("Disabling Tracing for CacheMap 0x%p:\n", SharedCacheMap);
}
#else
UNREFERENCED_PARAMETER(SharedCacheMap);
UNREFERENCED_PARAMETER(Trace);
#endif
}
NTSTATUS
NTAPI
CcRosFlushVacb (
PROS_VACB Vacb)
{
NTSTATUS Status;
CcRosUnmarkDirtyVacb(Vacb, TRUE);
Status = CcWriteVirtualAddress(Vacb);
if (!NT_SUCCESS(Status))
{
CcRosMarkDirtyVacb(Vacb);
}
return Status;
}
NTSTATUS
NTAPI
CcRosFlushDirtyPages (
ULONG Target,
PULONG Count,
BOOLEAN Wait,
BOOLEAN CalledFromLazy)
{
PLIST_ENTRY current_entry;
PROS_VACB current;
BOOLEAN Locked;
NTSTATUS Status;
DPRINT("CcRosFlushDirtyPages(Target %lu)\n", Target);
(*Count) = 0;
KeEnterCriticalRegion();
KeAcquireGuardedMutex(&ViewLock);
current_entry = DirtyVacbListHead.Flink;
if (current_entry == &DirtyVacbListHead)
{
DPRINT("No Dirty pages\n");
}
while ((current_entry != &DirtyVacbListHead) && (Target > 0))
{
current = CONTAINING_RECORD(current_entry,
ROS_VACB,
DirtyVacbListEntry);
current_entry = current_entry->Flink;
CcRosVacbIncRefCount(current);
/* When performing lazy write, don't handle temporary files */
if (CalledFromLazy &&
BooleanFlagOn(current->SharedCacheMap->FileObject->Flags, FO_TEMPORARY_FILE))
{
CcRosVacbDecRefCount(current);
continue;
}
Locked = current->SharedCacheMap->Callbacks->AcquireForLazyWrite(
current->SharedCacheMap->LazyWriteContext, Wait);
if (!Locked)
{
CcRosVacbDecRefCount(current);
continue;
}
ASSERT(current->Dirty);
KeReleaseGuardedMutex(&ViewLock);
Status = CcRosFlushVacb(current);
current->SharedCacheMap->Callbacks->ReleaseFromLazyWrite(
current->SharedCacheMap->LazyWriteContext);
KeAcquireGuardedMutex(&ViewLock);
CcRosVacbDecRefCount(current);
if (!NT_SUCCESS(Status) && (Status != STATUS_END_OF_FILE) &&
(Status != STATUS_MEDIA_WRITE_PROTECTED))
{
DPRINT1("CC: Failed to flush VACB.\n");
}
else
{
ULONG PagesFreed;
/* How many pages did we free? */
PagesFreed = VACB_MAPPING_GRANULARITY / PAGE_SIZE;
(*Count) += PagesFreed;
/* Make sure we don't overflow target! */
if (Target < PagesFreed)
{
/* If we would have, jump to zero directly */
Target = 0;
}
else
{
Target -= PagesFreed;
}
}
current_entry = DirtyVacbListHead.Flink;
}
KeReleaseGuardedMutex(&ViewLock);
KeLeaveCriticalRegion();
DPRINT("CcRosFlushDirtyPages() finished\n");
return STATUS_SUCCESS;
}
NTSTATUS
CcRosTrimCache (
ULONG Target,
ULONG Priority,
PULONG NrFreed)
/*
* FUNCTION: Try to free some memory from the file cache.
* ARGUMENTS:
* Target - The number of pages to be freed.
* Priority - The priority of free (currently unused).
* NrFreed - Points to a variable where the number of pages
* actually freed is returned.
*/
{
PLIST_ENTRY current_entry;
PROS_VACB current;
ULONG PagesFreed;
KIRQL oldIrql;
LIST_ENTRY FreeList;
PFN_NUMBER Page;
ULONG i;
BOOLEAN FlushedPages = FALSE;
DPRINT("CcRosTrimCache(Target %lu)\n", Target);
InitializeListHead(&FreeList);
*NrFreed = 0;
retry:
KeAcquireGuardedMutex(&ViewLock);
current_entry = VacbLruListHead.Flink;
while (current_entry != &VacbLruListHead)
{
ULONG Refs;
current = CONTAINING_RECORD(current_entry,
ROS_VACB,
VacbLruListEntry);
current_entry = current_entry->Flink;
KeAcquireSpinLock(&current->SharedCacheMap->CacheMapLock, &oldIrql);
/* Reference the VACB */
CcRosVacbIncRefCount(current);
/* Check if it's mapped and not dirty */
if (InterlockedCompareExchange((PLONG)&current->MappedCount, 0, 0) > 0 && !current->Dirty)
{
/* We have to break these locks because Cc sucks */
KeReleaseSpinLock(&current->SharedCacheMap->CacheMapLock, oldIrql);
KeReleaseGuardedMutex(&ViewLock);
/* Page out the VACB */
for (i = 0; i < VACB_MAPPING_GRANULARITY / PAGE_SIZE; i++)
{
Page = (PFN_NUMBER)(MmGetPhysicalAddress((PUCHAR)current->BaseAddress + (i * PAGE_SIZE)).QuadPart >> PAGE_SHIFT);
MmPageOutPhysicalAddress(Page);
}
/* Reacquire the locks */
KeAcquireGuardedMutex(&ViewLock);
KeAcquireSpinLock(&current->SharedCacheMap->CacheMapLock, &oldIrql);
}
/* Dereference the VACB */
Refs = CcRosVacbDecRefCount(current);
/* Check if we can free this entry now */
if (Refs < 2)
{
ASSERT(!current->Dirty);
ASSERT(!current->MappedCount);
ASSERT(Refs == 1);
RemoveEntryList(&current->CacheMapVacbListEntry);
RemoveEntryList(&current->VacbLruListEntry);
InitializeListHead(&current->VacbLruListEntry);
InsertHeadList(&FreeList, &current->CacheMapVacbListEntry);
/* Calculate how many pages we freed for Mm */
PagesFreed = min(VACB_MAPPING_GRANULARITY / PAGE_SIZE, Target);
Target -= PagesFreed;
(*NrFreed) += PagesFreed;
}
KeReleaseSpinLock(&current->SharedCacheMap->CacheMapLock, oldIrql);
}
KeReleaseGuardedMutex(&ViewLock);
/* Try flushing pages if we haven't met our target */
if ((Target > 0) && !FlushedPages)
{
/* Flush dirty pages to disk */
CcRosFlushDirtyPages(Target, &PagesFreed, FALSE, FALSE);
FlushedPages = TRUE;
/* We can only swap as many pages as we flushed */
if (PagesFreed < Target) Target = PagesFreed;
/* Check if we flushed anything */
if (PagesFreed != 0)
{
/* Try again after flushing dirty pages */
DPRINT("Flushed %lu dirty cache pages to disk\n", PagesFreed);
goto retry;
}
}
while (!IsListEmpty(&FreeList))
{
ULONG Refs;
current_entry = RemoveHeadList(&FreeList);
current = CONTAINING_RECORD(current_entry,
ROS_VACB,
CacheMapVacbListEntry);
InitializeListHead(&current->CacheMapVacbListEntry);
Refs = CcRosVacbDecRefCount(current);
ASSERT(Refs == 0);
}
DPRINT("Evicted %lu cache pages\n", (*NrFreed));
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
CcRosReleaseVacb (
PROS_SHARED_CACHE_MAP SharedCacheMap,
PROS_VACB Vacb,
BOOLEAN Valid,
BOOLEAN Dirty,
BOOLEAN Mapped)
{
ULONG Refs;
ASSERT(SharedCacheMap);
DPRINT("CcRosReleaseVacb(SharedCacheMap 0x%p, Vacb 0x%p, Valid %u)\n",
SharedCacheMap, Vacb, Valid);
Vacb->Valid = Valid;
if (Dirty && !Vacb->Dirty)
{
CcRosMarkDirtyVacb(Vacb);
}
if (Mapped)
{
if (InterlockedIncrement((PLONG)&Vacb->MappedCount) == 1)
{
CcRosVacbIncRefCount(Vacb);
}
}
Refs = CcRosVacbDecRefCount(Vacb);
ASSERT(Refs > 0);
return STATUS_SUCCESS;
}
/* Returns with VACB Lock Held! */
PROS_VACB
NTAPI
CcRosLookupVacb (
PROS_SHARED_CACHE_MAP SharedCacheMap,
LONGLONG FileOffset)
{
PLIST_ENTRY current_entry;
PROS_VACB current;
KIRQL oldIrql;
ASSERT(SharedCacheMap);
DPRINT("CcRosLookupVacb(SharedCacheMap 0x%p, FileOffset %I64u)\n",
SharedCacheMap, FileOffset);
KeAcquireGuardedMutex(&ViewLock);
KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
current_entry = SharedCacheMap->CacheMapVacbListHead.Flink;
while (current_entry != &SharedCacheMap->CacheMapVacbListHead)
{
current = CONTAINING_RECORD(current_entry,
ROS_VACB,
CacheMapVacbListEntry);
if (IsPointInRange(current->FileOffset.QuadPart,
VACB_MAPPING_GRANULARITY,
FileOffset))
{
CcRosVacbIncRefCount(current);
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
KeReleaseGuardedMutex(&ViewLock);
return current;
}
if (current->FileOffset.QuadPart > FileOffset)
break;
current_entry = current_entry->Flink;
}
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
KeReleaseGuardedMutex(&ViewLock);
return NULL;
}
VOID
NTAPI
CcRosMarkDirtyVacb (
PROS_VACB Vacb)
{
KIRQL oldIrql;
PROS_SHARED_CACHE_MAP SharedCacheMap;
SharedCacheMap = Vacb->SharedCacheMap;
KeAcquireGuardedMutex(&ViewLock);
KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
ASSERT(!Vacb->Dirty);
InsertTailList(&DirtyVacbListHead, &Vacb->DirtyVacbListEntry);
CcTotalDirtyPages += VACB_MAPPING_GRANULARITY / PAGE_SIZE;
Vacb->SharedCacheMap->DirtyPages += VACB_MAPPING_GRANULARITY / PAGE_SIZE;
CcRosVacbIncRefCount(Vacb);
/* Move to the tail of the LRU list */
RemoveEntryList(&Vacb->VacbLruListEntry);
InsertTailList(&VacbLruListHead, &Vacb->VacbLruListEntry);
Vacb->Dirty = TRUE;
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
KeReleaseGuardedMutex(&ViewLock);
/* Schedule a lazy writer run to now that we have dirty VACB */
oldIrql = KeAcquireQueuedSpinLock(LockQueueMasterLock);
if (!LazyWriter.ScanActive)
{
CcScheduleLazyWriteScan(FALSE);
}
KeReleaseQueuedSpinLock(LockQueueMasterLock, oldIrql);
}
VOID
NTAPI
CcRosUnmarkDirtyVacb (
PROS_VACB Vacb,
BOOLEAN LockViews)
{
KIRQL oldIrql;
PROS_SHARED_CACHE_MAP SharedCacheMap;
SharedCacheMap = Vacb->SharedCacheMap;
if (LockViews)
{
KeAcquireGuardedMutex(&ViewLock);
KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
}
ASSERT(Vacb->Dirty);
Vacb->Dirty = FALSE;
RemoveEntryList(&Vacb->DirtyVacbListEntry);
InitializeListHead(&Vacb->DirtyVacbListEntry);
CcTotalDirtyPages -= VACB_MAPPING_GRANULARITY / PAGE_SIZE;
Vacb->SharedCacheMap->DirtyPages -= VACB_MAPPING_GRANULARITY / PAGE_SIZE;
CcRosVacbDecRefCount(Vacb);
if (LockViews)
{
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
KeReleaseGuardedMutex(&ViewLock);
}
}
NTSTATUS
NTAPI
CcRosMarkDirtyFile (
PROS_SHARED_CACHE_MAP SharedCacheMap,
LONGLONG FileOffset)
{
PROS_VACB Vacb;
ASSERT(SharedCacheMap);
DPRINT("CcRosMarkDirtyVacb(SharedCacheMap 0x%p, FileOffset %I64u)\n",
SharedCacheMap, FileOffset);
Vacb = CcRosLookupVacb(SharedCacheMap, FileOffset);
if (Vacb == NULL)
{
KeBugCheck(CACHE_MANAGER);
}
CcRosReleaseVacb(SharedCacheMap, Vacb, Vacb->Valid, TRUE, FALSE);
return STATUS_SUCCESS;
}
/*
* Note: this is not the contrary function of
* CcRosMapVacbInKernelSpace()
*/
NTSTATUS
NTAPI
CcRosUnmapVacb (
PROS_SHARED_CACHE_MAP SharedCacheMap,
LONGLONG FileOffset,
BOOLEAN NowDirty)
{
PROS_VACB Vacb;
ASSERT(SharedCacheMap);
DPRINT("CcRosUnmapVacb(SharedCacheMap 0x%p, FileOffset %I64u, NowDirty %u)\n",
SharedCacheMap, FileOffset, NowDirty);
Vacb = CcRosLookupVacb(SharedCacheMap, FileOffset);
if (Vacb == NULL)
{
return STATUS_UNSUCCESSFUL;
}
ASSERT(Vacb->MappedCount != 0);
if (InterlockedDecrement((PLONG)&Vacb->MappedCount) == 0)
{
CcRosVacbDecRefCount(Vacb);
}
CcRosReleaseVacb(SharedCacheMap, Vacb, Vacb->Valid, NowDirty, FALSE);
return STATUS_SUCCESS;
}
static
NTSTATUS
CcRosMapVacbInKernelSpace(
PROS_VACB Vacb)
{
ULONG i;
NTSTATUS Status;
ULONG_PTR NumberOfPages;
PVOID BaseAddress = NULL;
/* Create a memory area. */
MmLockAddressSpace(MmGetKernelAddressSpace());
Status = MmCreateMemoryArea(MmGetKernelAddressSpace(),
0, // nothing checks for VACB mareas, so set to 0
&BaseAddress,
VACB_MAPPING_GRANULARITY,
PAGE_READWRITE,
(PMEMORY_AREA*)&Vacb->MemoryArea,
0,
PAGE_SIZE);
ASSERT(Vacb->BaseAddress == NULL);
Vacb->BaseAddress = BaseAddress;
MmUnlockAddressSpace(MmGetKernelAddressSpace());
if (!NT_SUCCESS(Status))
{
DPRINT1("MmCreateMemoryArea failed with %lx for VACB %p\n", Status, Vacb);
return Status;
}
ASSERT(((ULONG_PTR)Vacb->BaseAddress % PAGE_SIZE) == 0);
ASSERT((ULONG_PTR)Vacb->BaseAddress > (ULONG_PTR)MmSystemRangeStart);
ASSERT((ULONG_PTR)Vacb->BaseAddress + VACB_MAPPING_GRANULARITY - 1 > (ULONG_PTR)MmSystemRangeStart);
/* Create a virtual mapping for this memory area */
NumberOfPages = BYTES_TO_PAGES(VACB_MAPPING_GRANULARITY);
for (i = 0; i < NumberOfPages; i++)
{
PFN_NUMBER PageFrameNumber;
MI_SET_USAGE(MI_USAGE_CACHE);
Status = MmRequestPageMemoryConsumer(MC_CACHE, TRUE, &PageFrameNumber);
if (PageFrameNumber == 0)
{
DPRINT1("Unable to allocate page\n");
KeBugCheck(MEMORY_MANAGEMENT);
}
ASSERT(BaseAddress == Vacb->BaseAddress);
ASSERT(i * PAGE_SIZE < VACB_MAPPING_GRANULARITY);
ASSERT((ULONG_PTR)Vacb->BaseAddress + (i * PAGE_SIZE) >= (ULONG_PTR)BaseAddress);
ASSERT((ULONG_PTR)Vacb->BaseAddress + (i * PAGE_SIZE) > (ULONG_PTR)MmSystemRangeStart);
Status = MmCreateVirtualMapping(NULL,
(PVOID)((ULONG_PTR)Vacb->BaseAddress + (i * PAGE_SIZE)),
PAGE_READWRITE,
&PageFrameNumber,
1);
if (!NT_SUCCESS(Status))
{
DPRINT1("Unable to create virtual mapping\n");
KeBugCheck(MEMORY_MANAGEMENT);
}
}
return STATUS_SUCCESS;
}
static
BOOLEAN
CcRosFreeUnusedVacb (
PULONG Count)
{
ULONG cFreed;
BOOLEAN Freed;
KIRQL oldIrql;
PROS_VACB current;
LIST_ENTRY FreeList;
PLIST_ENTRY current_entry;
cFreed = 0;
Freed = FALSE;
InitializeListHead(&FreeList);
KeAcquireGuardedMutex(&ViewLock);
/* Browse all the available VACB */
current_entry = VacbLruListHead.Flink;
while (current_entry != &VacbLruListHead)
{
ULONG Refs;
current = CONTAINING_RECORD(current_entry,
ROS_VACB,
VacbLruListEntry);
current_entry = current_entry->Flink;
KeAcquireSpinLock(&current->SharedCacheMap->CacheMapLock, &oldIrql);
/* Only deal with unused VACB, we will free them */
Refs = CcRosVacbGetRefCount(current);
if (Refs < 2)
{
ASSERT(!current->Dirty);
ASSERT(!current->MappedCount);
ASSERT(Refs == 1);
/* Reset and move to free list */
RemoveEntryList(&current->CacheMapVacbListEntry);
RemoveEntryList(&current->VacbLruListEntry);
InitializeListHead(&current->VacbLruListEntry);
InsertHeadList(&FreeList, &current->CacheMapVacbListEntry);
}
KeReleaseSpinLock(&current->SharedCacheMap->CacheMapLock, oldIrql);
}
KeReleaseGuardedMutex(&ViewLock);
/* And now, free any of the found VACB, that'll free memory! */
while (!IsListEmpty(&FreeList))
{
ULONG Refs;
current_entry = RemoveHeadList(&FreeList);
current = CONTAINING_RECORD(current_entry,
ROS_VACB,
CacheMapVacbListEntry);
InitializeListHead(&current->CacheMapVacbListEntry);
Refs = CcRosVacbDecRefCount(current);
ASSERT(Refs == 0);
++cFreed;
}
/* If we freed at least one VACB, return success */
if (cFreed != 0)
{
Freed = TRUE;
}
/* If caller asked for free count, return it */
if (Count != NULL)
{
*Count = cFreed;
}
return Freed;
}
static
NTSTATUS
CcRosCreateVacb (
PROS_SHARED_CACHE_MAP SharedCacheMap,
LONGLONG FileOffset,
PROS_VACB *Vacb)
{
PROS_VACB current;
PROS_VACB previous;
PLIST_ENTRY current_entry;
NTSTATUS Status;
KIRQL oldIrql;
ULONG Refs;
BOOLEAN Retried;
ASSERT(SharedCacheMap);
DPRINT("CcRosCreateVacb()\n");
if (FileOffset >= SharedCacheMap->SectionSize.QuadPart)
{
*Vacb = NULL;
return STATUS_INVALID_PARAMETER;
}
current = ExAllocateFromNPagedLookasideList(&VacbLookasideList);
current->BaseAddress = NULL;
current->Valid = FALSE;
current->Dirty = FALSE;
current->PageOut = FALSE;
current->FileOffset.QuadPart = ROUND_DOWN(FileOffset, VACB_MAPPING_GRANULARITY);
current->SharedCacheMap = SharedCacheMap;
#if DBG
if (SharedCacheMap->Trace)
{
DPRINT1("CacheMap 0x%p: new VACB: 0x%p\n", SharedCacheMap, current);
}
#endif
current->MappedCount = 0;
current->ReferenceCount = 0;
current->PinCount = 0;
InitializeListHead(&current->CacheMapVacbListEntry);
InitializeListHead(&current->DirtyVacbListEntry);
InitializeListHead(&current->VacbLruListEntry);
CcRosVacbIncRefCount(current);
Retried = FALSE;
Retry:
/* Map VACB in kernel space */
Status = CcRosMapVacbInKernelSpace(current);
if (!NT_SUCCESS(Status))
{
ULONG Freed;
/* If no space left, try to prune unused VACB
* to recover space to map our VACB
* If it succeed, retry to map, otherwise
* just fail.
*/
if (!Retried && CcRosFreeUnusedVacb(&Freed))
{
DPRINT("Prunned %d VACB, trying again\n", Freed);
Retried = TRUE;
goto Retry;
}
CcRosVacbDecRefCount(current);
ExFreeToNPagedLookasideList(&VacbLookasideList, current);
return Status;
}
KeAcquireGuardedMutex(&ViewLock);
*Vacb = current;
/* There is window between the call to CcRosLookupVacb
* and CcRosCreateVacb. We must check if a VACB for the
* file offset exist. If there is a VACB, we release
* our newly created VACB and return the existing one.
*/
KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
current_entry = SharedCacheMap->CacheMapVacbListHead.Flink;
previous = NULL;
while (current_entry != &SharedCacheMap->CacheMapVacbListHead)
{
current = CONTAINING_RECORD(current_entry,
ROS_VACB,
CacheMapVacbListEntry);
if (IsPointInRange(current->FileOffset.QuadPart,
VACB_MAPPING_GRANULARITY,
FileOffset))
{
CcRosVacbIncRefCount(current);
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
#if DBG
if (SharedCacheMap->Trace)
{
DPRINT1("CacheMap 0x%p: deleting newly created VACB 0x%p ( found existing one 0x%p )\n",
SharedCacheMap,
(*Vacb),
current);
}
#endif
KeReleaseGuardedMutex(&ViewLock);
Refs = CcRosVacbDecRefCount(*Vacb);
ASSERT(Refs == 0);
*Vacb = current;
return STATUS_SUCCESS;
}
if (current->FileOffset.QuadPart < FileOffset)
{
ASSERT(previous == NULL ||
previous->FileOffset.QuadPart < current->FileOffset.QuadPart);
previous = current;
}
if (current->FileOffset.QuadPart > FileOffset)
break;
current_entry = current_entry->Flink;
}
/* There was no existing VACB. */
current = *Vacb;
if (previous)
{
InsertHeadList(&previous->CacheMapVacbListEntry, &current->CacheMapVacbListEntry);
}
else
{
InsertHeadList(&SharedCacheMap->CacheMapVacbListHead, &current->CacheMapVacbListEntry);
}
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
InsertTailList(&VacbLruListHead, &current->VacbLruListEntry);
KeReleaseGuardedMutex(&ViewLock);
MI_SET_USAGE(MI_USAGE_CACHE);
#if MI_TRACE_PFNS
if ((SharedCacheMap->FileObject) && (SharedCacheMap->FileObject->FileName.Buffer))
{
PWCHAR pos;
ULONG len = 0;
pos = wcsrchr(SharedCacheMap->FileObject->FileName.Buffer, '\\');
if (pos)
{
len = wcslen(pos) * sizeof(WCHAR);
snprintf(MI_PFN_CURRENT_PROCESS_NAME, min(16, len), "%S", pos);
}
else
{
snprintf(MI_PFN_CURRENT_PROCESS_NAME, min(16, len), "%wZ", &SharedCacheMap->FileObject->FileName);
}
}
#endif
/* Reference it to allow release */
CcRosVacbIncRefCount(current);
return Status;
}
NTSTATUS
NTAPI
CcRosGetVacb (
PROS_SHARED_CACHE_MAP SharedCacheMap,
LONGLONG FileOffset,
PLONGLONG BaseOffset,
PVOID* BaseAddress,
PBOOLEAN UptoDate,
PROS_VACB *Vacb)
{
PROS_VACB current;
NTSTATUS Status;
ULONG Refs;
ASSERT(SharedCacheMap);
DPRINT("CcRosGetVacb()\n");
/*
* Look for a VACB already mapping the same data.
*/
current = CcRosLookupVacb(SharedCacheMap, FileOffset);
if (current == NULL)
{
/*
* Otherwise create a new VACB.
*/
Status = CcRosCreateVacb(SharedCacheMap, FileOffset, &current);
if (!NT_SUCCESS(Status))
{
return Status;
}
}
Refs = CcRosVacbGetRefCount(current);
KeAcquireGuardedMutex(&ViewLock);
/* Move to the tail of the LRU list */
RemoveEntryList(&current->VacbLruListEntry);
InsertTailList(&VacbLruListHead, &current->VacbLruListEntry);
KeReleaseGuardedMutex(&ViewLock);
/*
* Return information about the VACB to the caller.
*/
*UptoDate = current->Valid;
*BaseAddress = current->BaseAddress;
DPRINT("*BaseAddress %p\n", *BaseAddress);
*Vacb = current;
*BaseOffset = current->FileOffset.QuadPart;
ASSERT(Refs > 1);
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
CcRosRequestVacb (
PROS_SHARED_CACHE_MAP SharedCacheMap,
LONGLONG FileOffset,
PVOID* BaseAddress,
PBOOLEAN UptoDate,
PROS_VACB *Vacb)
/*
* FUNCTION: Request a page mapping for a shared cache map
*/
{
LONGLONG BaseOffset;
ASSERT(SharedCacheMap);
if (FileOffset % VACB_MAPPING_GRANULARITY != 0)
{
DPRINT1("Bad fileoffset %I64x should be multiple of %x",
FileOffset, VACB_MAPPING_GRANULARITY);
KeBugCheck(CACHE_MANAGER);
}
return CcRosGetVacb(SharedCacheMap,
FileOffset,
&BaseOffset,
BaseAddress,
UptoDate,
Vacb);
}
static
VOID
CcFreeCachePage (
PVOID Context,
MEMORY_AREA* MemoryArea,
PVOID Address,
PFN_NUMBER Page,
SWAPENTRY SwapEntry,
BOOLEAN Dirty)
{
ASSERT(SwapEntry == 0);
if (Page != 0)
{
ASSERT(MmGetReferenceCountPage(Page) == 1);
MmReleasePageMemoryConsumer(MC_CACHE, Page);
}
}
NTSTATUS
CcRosInternalFreeVacb (
PROS_VACB Vacb)
/*
* FUNCTION: Releases a VACB associated with a shared cache map
*/
{
DPRINT("Freeing VACB 0x%p\n", Vacb);
#if DBG
if (Vacb->SharedCacheMap->Trace)
{
DPRINT1("CacheMap 0x%p: deleting VACB: 0x%p\n", Vacb->SharedCacheMap, Vacb);
}
#endif
MmLockAddressSpace(MmGetKernelAddressSpace());
MmFreeMemoryArea(MmGetKernelAddressSpace(),
Vacb->MemoryArea,
CcFreeCachePage,
NULL);
MmUnlockAddressSpace(MmGetKernelAddressSpace());
if (Vacb->PinCount != 0 || Vacb->ReferenceCount != 0)
{
DPRINT1("Invalid free: %ld, %ld\n", Vacb->ReferenceCount, Vacb->PinCount);
if (Vacb->SharedCacheMap->FileObject && Vacb->SharedCacheMap->FileObject->FileName.Length)
{
DPRINT1("For file: %wZ\n", &Vacb->SharedCacheMap->FileObject->FileName);
}
}
ASSERT(Vacb->PinCount == 0);
ASSERT(Vacb->ReferenceCount == 0);
ASSERT(IsListEmpty(&Vacb->CacheMapVacbListEntry));
ASSERT(IsListEmpty(&Vacb->DirtyVacbListEntry));
ASSERT(IsListEmpty(&Vacb->VacbLruListEntry));
RtlFillMemory(Vacb, sizeof(*Vacb), 0xfd);
ExFreeToNPagedLookasideList(&VacbLookasideList, Vacb);
return STATUS_SUCCESS;
}
/*
* @implemented
*/
VOID
NTAPI
CcFlushCache (
IN PSECTION_OBJECT_POINTERS SectionObjectPointers,
IN PLARGE_INTEGER FileOffset OPTIONAL,
IN ULONG Length,
OUT PIO_STATUS_BLOCK IoStatus)
{
PROS_SHARED_CACHE_MAP SharedCacheMap;
LARGE_INTEGER Offset;
LONGLONG RemainingLength;
PROS_VACB current;
NTSTATUS Status;
CCTRACE(CC_API_DEBUG, "SectionObjectPointers=%p FileOffset=%p Length=%lu\n",
SectionObjectPointers, FileOffset, Length);
DPRINT("CcFlushCache(SectionObjectPointers 0x%p, FileOffset 0x%p, Length %lu, IoStatus 0x%p)\n",
SectionObjectPointers, FileOffset, Length, IoStatus);
if (SectionObjectPointers && SectionObjectPointers->SharedCacheMap)
{
SharedCacheMap = SectionObjectPointers->SharedCacheMap;
ASSERT(SharedCacheMap);
if (FileOffset)
{
Offset = *FileOffset;
RemainingLength = Length;
}
else
{
Offset.QuadPart = 0;
RemainingLength = SharedCacheMap->FileSize.QuadPart;
}
if (IoStatus)
{
IoStatus->Status = STATUS_SUCCESS;
IoStatus->Information = 0;
}
while (RemainingLength > 0)
{
current = CcRosLookupVacb(SharedCacheMap, Offset.QuadPart);
if (current != NULL)
{
if (current->Dirty)
{
Status = CcRosFlushVacb(current);
if (!NT_SUCCESS(Status) && IoStatus != NULL)
{
IoStatus->Status = Status;
}
}
CcRosReleaseVacb(SharedCacheMap, current, current->Valid, current->Dirty, FALSE);
}
Offset.QuadPart += VACB_MAPPING_GRANULARITY;
RemainingLength -= min(RemainingLength, VACB_MAPPING_GRANULARITY);
}
}
else
{
if (IoStatus)
{
IoStatus->Status = STATUS_INVALID_PARAMETER;
}
}
}
NTSTATUS
NTAPI
CcRosDeleteFileCache (
PFILE_OBJECT FileObject,
PROS_SHARED_CACHE_MAP SharedCacheMap)
/*
* FUNCTION: Releases the shared cache map associated with a file object
*/
{
PLIST_ENTRY current_entry;
PROS_VACB current;
LIST_ENTRY FreeList;
KIRQL oldIrql;
ASSERT(SharedCacheMap);
SharedCacheMap->OpenCount++;
KeReleaseGuardedMutex(&ViewLock);
CcFlushCache(FileObject->SectionObjectPointer, NULL, 0, NULL);
KeAcquireGuardedMutex(&ViewLock);
SharedCacheMap->OpenCount--;
if (SharedCacheMap->OpenCount == 0)
{
KIRQL OldIrql;
FileObject->SectionObjectPointer->SharedCacheMap = NULL;
/*
* Release all VACBs
*/
InitializeListHead(&FreeList);
KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
while (!IsListEmpty(&SharedCacheMap->CacheMapVacbListHead))
{
current_entry = RemoveTailList(&SharedCacheMap->CacheMapVacbListHead);
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
current = CONTAINING_RECORD(current_entry, ROS_VACB, CacheMapVacbListEntry);
RemoveEntryList(&current->VacbLruListEntry);
InitializeListHead(&current->VacbLruListEntry);
if (current->Dirty)
{
KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
CcRosUnmarkDirtyVacb(current, FALSE);
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
DPRINT1("Freeing dirty VACB\n");
}
if (current->MappedCount != 0)
{
current->MappedCount = 0;
NT_VERIFY(CcRosVacbDecRefCount(current) > 0);
DPRINT1("Freeing mapped VACB\n");
}
InsertHeadList(&FreeList, &current->CacheMapVacbListEntry);
KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldIrql);
}
#if DBG
SharedCacheMap->Trace = FALSE;
#endif
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
KeReleaseGuardedMutex(&ViewLock);
ObDereferenceObject(SharedCacheMap->FileObject);
while (!IsListEmpty(&FreeList))
{
ULONG Refs;
current_entry = RemoveTailList(&FreeList);
current = CONTAINING_RECORD(current_entry, ROS_VACB, CacheMapVacbListEntry);
InitializeListHead(&current->CacheMapVacbListEntry);
Refs = CcRosVacbDecRefCount(current);
#if DBG // CORE-14578
if (Refs != 0)
{
DPRINT1("Leaking VACB %p attached to %p (%I64d)\n", current, FileObject, current->FileOffset.QuadPart);
DPRINT1("There are: %d references left\n", Refs);
DPRINT1("Pin: %d, Map: %d\n", current->PinCount, current->MappedCount);
DPRINT1("Dirty: %d\n", current->Dirty);
if (FileObject->FileName.Length != 0)
{
DPRINT1("File was: %wZ\n", &FileObject->FileName);
}
else if (FileObject->FsContext != NULL &&
((PFSRTL_COMMON_FCB_HEADER)(FileObject->FsContext))->NodeTypeCode == 0x0502 &&
((PFSRTL_COMMON_FCB_HEADER)(FileObject->FsContext))->NodeByteSize == 0x1F8 &&
((PUNICODE_STRING)(((PUCHAR)FileObject->FsContext) + 0x100))->Length != 0)
{
DPRINT1("File was: %wZ (FastFAT)\n", (PUNICODE_STRING)(((PUCHAR)FileObject->FsContext) + 0x100));
}
else
{
DPRINT1("No name for the file\n");
}
}
#else
ASSERT(Refs == 0);
#endif
}
OldIrql = KeAcquireQueuedSpinLock(LockQueueMasterLock);
RemoveEntryList(&SharedCacheMap->SharedCacheMapLinks);
KeReleaseQueuedSpinLock(LockQueueMasterLock, OldIrql);
ExFreeToNPagedLookasideList(&SharedCacheMapLookasideList, SharedCacheMap);
KeAcquireGuardedMutex(&ViewLock);
}
return STATUS_SUCCESS;
}
VOID
NTAPI
CcRosReferenceCache (
PFILE_OBJECT FileObject)
{
PROS_SHARED_CACHE_MAP SharedCacheMap;
KeAcquireGuardedMutex(&ViewLock);
SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
ASSERT(SharedCacheMap);
ASSERT(SharedCacheMap->OpenCount != 0);
SharedCacheMap->OpenCount++;
KeReleaseGuardedMutex(&ViewLock);
}
VOID
NTAPI
CcRosRemoveIfClosed (
PSECTION_OBJECT_POINTERS SectionObjectPointer)
{
PROS_SHARED_CACHE_MAP SharedCacheMap;
DPRINT("CcRosRemoveIfClosed()\n");
KeAcquireGuardedMutex(&ViewLock);
SharedCacheMap = SectionObjectPointer->SharedCacheMap;
if (SharedCacheMap && SharedCacheMap->OpenCount == 0)
{
CcRosDeleteFileCache(SharedCacheMap->FileObject, SharedCacheMap);
}
KeReleaseGuardedMutex(&ViewLock);
}
VOID
NTAPI
CcRosDereferenceCache (
PFILE_OBJECT FileObject)
{
PROS_SHARED_CACHE_MAP SharedCacheMap;
KeAcquireGuardedMutex(&ViewLock);
SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
ASSERT(SharedCacheMap);
if (SharedCacheMap->OpenCount > 0)
{
SharedCacheMap->OpenCount--;
if (SharedCacheMap->OpenCount == 0)
{
MmFreeSectionSegments(SharedCacheMap->FileObject);
CcRosDeleteFileCache(FileObject, SharedCacheMap);
}
}
KeReleaseGuardedMutex(&ViewLock);
}
NTSTATUS
NTAPI
CcRosReleaseFileCache (
PFILE_OBJECT FileObject)
/*
* FUNCTION: Called by the file system when a handle to a file object
* has been closed.
*/
{
KIRQL OldIrql;
PPRIVATE_CACHE_MAP PrivateMap;
PROS_SHARED_CACHE_MAP SharedCacheMap;
KeAcquireGuardedMutex(&ViewLock);
if (FileObject->SectionObjectPointer->SharedCacheMap != NULL)
{
SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
/* Closing the handle, so kill the private cache map
* Before you event try to remove it from FO, always
* lock the master lock, to be sure not to race
* with a potential read ahead ongoing!
*/
OldIrql = KeAcquireQueuedSpinLock(LockQueueMasterLock);
PrivateMap = FileObject->PrivateCacheMap;
FileObject->PrivateCacheMap = NULL;
KeReleaseQueuedSpinLock(LockQueueMasterLock, OldIrql);
if (PrivateMap != NULL)
{
/* Remove it from the file */
KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &OldIrql);
RemoveEntryList(&PrivateMap->PrivateLinks);
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, OldIrql);
/* And free it. */
if (PrivateMap != &SharedCacheMap->PrivateCacheMap)
{
ExFreePoolWithTag(PrivateMap, TAG_PRIVATE_CACHE_MAP);
}
else
{
PrivateMap->NodeTypeCode = 0;
}
if (SharedCacheMap->OpenCount > 0)
{
SharedCacheMap->OpenCount--;
if (SharedCacheMap->OpenCount == 0)
{
MmFreeSectionSegments(SharedCacheMap->FileObject);
CcRosDeleteFileCache(FileObject, SharedCacheMap);
}
}
}
}
KeReleaseGuardedMutex(&ViewLock);
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
CcRosInitializeFileCache (
PFILE_OBJECT FileObject,
PCC_FILE_SIZES FileSizes,
BOOLEAN PinAccess,
PCACHE_MANAGER_CALLBACKS CallBacks,
PVOID LazyWriterContext)
/*
* FUNCTION: Initializes a shared cache map for a file object
*/
{
KIRQL OldIrql;
BOOLEAN Allocated;
PROS_SHARED_CACHE_MAP SharedCacheMap;
DPRINT("CcRosInitializeFileCache(FileObject 0x%p)\n", FileObject);
Allocated = FALSE;
SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
if (SharedCacheMap == NULL)
{
Allocated = TRUE;
SharedCacheMap = ExAllocateFromNPagedLookasideList(&SharedCacheMapLookasideList);
if (SharedCacheMap == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlZeroMemory(SharedCacheMap, sizeof(*SharedCacheMap));
SharedCacheMap->NodeTypeCode = NODE_TYPE_SHARED_MAP;
SharedCacheMap->NodeByteSize = sizeof(*SharedCacheMap);
SharedCacheMap->FileObject = FileObject;
SharedCacheMap->Callbacks = CallBacks;
SharedCacheMap->LazyWriteContext = LazyWriterContext;
SharedCacheMap->SectionSize = FileSizes->AllocationSize;
SharedCacheMap->FileSize = FileSizes->FileSize;
SharedCacheMap->PinAccess = PinAccess;
SharedCacheMap->DirtyPageThreshold = 0;
SharedCacheMap->DirtyPages = 0;
InitializeListHead(&SharedCacheMap->PrivateList);
KeInitializeSpinLock(&SharedCacheMap->CacheMapLock);
InitializeListHead(&SharedCacheMap->CacheMapVacbListHead);
}
KeAcquireGuardedMutex(&ViewLock);
if (Allocated)
{
if (FileObject->SectionObjectPointer->SharedCacheMap == NULL)
{
ObReferenceObjectByPointer(FileObject,
FILE_ALL_ACCESS,
NULL,
KernelMode);
FileObject->SectionObjectPointer->SharedCacheMap = SharedCacheMap;
OldIrql = KeAcquireQueuedSpinLock(LockQueueMasterLock);
InsertTailList(&CcCleanSharedCacheMapList, &SharedCacheMap->SharedCacheMapLinks);
KeReleaseQueuedSpinLock(LockQueueMasterLock, OldIrql);
}
else
{
ExFreeToNPagedLookasideList(&SharedCacheMapLookasideList, SharedCacheMap);
SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
}
}
if (FileObject->PrivateCacheMap == NULL)
{
PPRIVATE_CACHE_MAP PrivateMap;
/* Allocate the private cache map for this handle */
if (SharedCacheMap->PrivateCacheMap.NodeTypeCode != 0)
{
PrivateMap = ExAllocatePoolWithTag(NonPagedPool, sizeof(PRIVATE_CACHE_MAP), TAG_PRIVATE_CACHE_MAP);
}
else
{
PrivateMap = &SharedCacheMap->PrivateCacheMap;
}
if (PrivateMap == NULL)
{
/* If we also allocated the shared cache map for this file, kill it */
if (Allocated)
{
OldIrql = KeAcquireQueuedSpinLock(LockQueueMasterLock);
RemoveEntryList(&SharedCacheMap->SharedCacheMapLinks);
KeReleaseQueuedSpinLock(LockQueueMasterLock, OldIrql);
FileObject->SectionObjectPointer->SharedCacheMap = NULL;
ObDereferenceObject(FileObject);
ExFreeToNPagedLookasideList(&SharedCacheMapLookasideList, SharedCacheMap);
}
KeReleaseGuardedMutex(&ViewLock);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Initialize it */
RtlZeroMemory(PrivateMap, sizeof(PRIVATE_CACHE_MAP));
PrivateMap->NodeTypeCode = NODE_TYPE_PRIVATE_MAP;
PrivateMap->ReadAheadMask = PAGE_SIZE - 1;
PrivateMap->FileObject = FileObject;
KeInitializeSpinLock(&PrivateMap->ReadAheadSpinLock);
/* Link it to the file */
KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &OldIrql);
InsertTailList(&SharedCacheMap->PrivateList, &PrivateMap->PrivateLinks);
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, OldIrql);
FileObject->PrivateCacheMap = PrivateMap;
SharedCacheMap->OpenCount++;
}
KeReleaseGuardedMutex(&ViewLock);
return STATUS_SUCCESS;
}
/*
* @implemented
*/
PFILE_OBJECT
NTAPI
CcGetFileObjectFromSectionPtrs (
IN PSECTION_OBJECT_POINTERS SectionObjectPointers)
{
PROS_SHARED_CACHE_MAP SharedCacheMap;
CCTRACE(CC_API_DEBUG, "SectionObjectPointers=%p\n", SectionObjectPointers);
if (SectionObjectPointers && SectionObjectPointers->SharedCacheMap)
{
SharedCacheMap = SectionObjectPointers->SharedCacheMap;
ASSERT(SharedCacheMap);
return SharedCacheMap->FileObject;
}
return NULL;
}
VOID
INIT_FUNCTION
NTAPI
CcInitView (
VOID)
{
DPRINT("CcInitView()\n");
InitializeListHead(&DirtyVacbListHead);
InitializeListHead(&VacbLruListHead);
InitializeListHead(&CcDeferredWrites);
InitializeListHead(&CcCleanSharedCacheMapList);
KeInitializeSpinLock(&CcDeferredWriteSpinLock);
KeInitializeGuardedMutex(&ViewLock);
ExInitializeNPagedLookasideList(&iBcbLookasideList,
NULL,
NULL,
0,
sizeof(INTERNAL_BCB),
TAG_BCB,
20);
ExInitializeNPagedLookasideList(&SharedCacheMapLookasideList,
NULL,
NULL,
0,
sizeof(ROS_SHARED_CACHE_MAP),
TAG_SHARED_CACHE_MAP,
20);
ExInitializeNPagedLookasideList(&VacbLookasideList,
NULL,
NULL,
0,
sizeof(ROS_VACB),
TAG_VACB,
20);
MmInitializeMemoryConsumer(MC_CACHE, CcRosTrimCache);
CcInitCacheZeroPage();
}
#if DBG && defined(KDBG)
BOOLEAN
ExpKdbgExtFileCache(ULONG Argc, PCHAR Argv[])
{
PLIST_ENTRY ListEntry;
UNICODE_STRING NoName = RTL_CONSTANT_STRING(L"No name for File");
KdbpPrint(" Usage Summary (in kb)\n");
KdbpPrint("Shared\t\tValid\tDirty\tName\n");
/* No need to lock the spin lock here, we're in DBG */
for (ListEntry = CcCleanSharedCacheMapList.Flink;
ListEntry != &CcCleanSharedCacheMapList;
ListEntry = ListEntry->Flink)
{
PLIST_ENTRY Vacbs;
ULONG Valid = 0, Dirty = 0;
PROS_SHARED_CACHE_MAP SharedCacheMap;
PUNICODE_STRING FileName;
PWSTR Extra = L"";
SharedCacheMap = CONTAINING_RECORD(ListEntry, ROS_SHARED_CACHE_MAP, SharedCacheMapLinks);
/* Dirty size */
Dirty = (SharedCacheMap->DirtyPages * PAGE_SIZE) / 1024;
/* First, count for all the associated VACB */
for (Vacbs = SharedCacheMap->CacheMapVacbListHead.Flink;
Vacbs != &SharedCacheMap->CacheMapVacbListHead;
Vacbs = Vacbs->Flink)
{
PROS_VACB Vacb;
Vacb = CONTAINING_RECORD(Vacbs, ROS_VACB, CacheMapVacbListEntry);
if (Vacb->Valid)
{
Valid += VACB_MAPPING_GRANULARITY / 1024;
}
}
/* Setup name */
if (SharedCacheMap->FileObject != NULL &&
SharedCacheMap->FileObject->FileName.Length != 0)
{
FileName = &SharedCacheMap->FileObject->FileName;
}
else if (SharedCacheMap->FileObject != NULL &&
SharedCacheMap->FileObject->FsContext != NULL &&
((PFSRTL_COMMON_FCB_HEADER)(SharedCacheMap->FileObject->FsContext))->NodeTypeCode == 0x0502 &&
((PFSRTL_COMMON_FCB_HEADER)(SharedCacheMap->FileObject->FsContext))->NodeByteSize == 0x1F8 &&
((PUNICODE_STRING)(((PUCHAR)SharedCacheMap->FileObject->FsContext) + 0x100))->Length != 0)
{
FileName = (PUNICODE_STRING)(((PUCHAR)SharedCacheMap->FileObject->FsContext) + 0x100);
Extra = L" (FastFAT)";
}
else
{
FileName = &NoName;
}
/* And print */
KdbpPrint("%p\t%d\t%d\t%wZ%S\n", SharedCacheMap, Valid, Dirty, FileName, Extra);
}
return TRUE;
}
BOOLEAN
ExpKdbgExtDefWrites(ULONG Argc, PCHAR Argv[])
{
KdbpPrint("CcTotalDirtyPages:\t%lu (%lu Kb)\n", CcTotalDirtyPages,
(CcTotalDirtyPages * PAGE_SIZE) / 1024);
KdbpPrint("CcDirtyPageThreshold:\t%lu (%lu Kb)\n", CcDirtyPageThreshold,
(CcDirtyPageThreshold * PAGE_SIZE) / 1024);
KdbpPrint("MmAvailablePages:\t%lu (%lu Kb)\n", MmAvailablePages,
(MmAvailablePages * PAGE_SIZE) / 1024);
KdbpPrint("MmThrottleTop:\t\t%lu (%lu Kb)\n", MmThrottleTop,
(MmThrottleTop * PAGE_SIZE) / 1024);
KdbpPrint("MmThrottleBottom:\t%lu (%lu Kb)\n", MmThrottleBottom,
(MmThrottleBottom * PAGE_SIZE) / 1024);
KdbpPrint("MmModifiedPageListHead.Total:\t%lu (%lu Kb)\n", MmModifiedPageListHead.Total,
(MmModifiedPageListHead.Total * PAGE_SIZE) / 1024);
if (CcTotalDirtyPages >= CcDirtyPageThreshold)
{
KdbpPrint("CcTotalDirtyPages above the threshold, writes should be throttled\n");
}
else if (CcTotalDirtyPages + 64 >= CcDirtyPageThreshold)
{
KdbpPrint("CcTotalDirtyPages within 64 (max charge) pages of the threshold, writes may be throttled\n");
}
else
{
KdbpPrint("CcTotalDirtyPages below the threshold, writes should not be throttled\n");
}
return TRUE;
}
#endif
/* EOF */
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