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[NTOSKRNL] When initializing file cache, also allocate a private cache map if needed.

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This commit is contained in:
Pierre Schweitzer 2018-02-07 23:18:54 +01:00
parent 0e932c7bef
commit 074e7e97fe
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GPG key ID: 7545556C3D585B0B
3 changed files with 60 additions and 3 deletions
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19
ntoskrnl/cc/fs.c
View file

@ -346,6 +346,25 @@ CcUninitializeCacheMap (
FALSE);
}
/* Closing the handle, so kill the private cache map */
if (FileObject->SectionObjectPointer->SharedCacheMap != NULL &&
FileObject->PrivateCacheMap != NULL)
{
PPRIVATE_CACHE_MAP PrivateMap;
PrivateMap = FileObject->PrivateCacheMap;
SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
/* Remove it from the file */
KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &OldIrql);
RemoveEntryList(&PrivateMap->PrivateLinks);
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, OldIrql);
/* And free it */
FileObject->PrivateCacheMap = NULL;
ExFreePoolWithTag(PrivateMap, 'cPcC');
}
Status = CcRosReleaseFileCache(FileObject);
if (UninitializeCompleteEvent)
{

42
ntoskrnl/cc/view.c
View file

@ -1209,17 +1209,19 @@ CcRosInitializeFileCache (
* FUNCTION: Initializes a shared cache map for a file object
*/
{
KIRQL OldIrql;
BOOLEAN Allocated;
PROS_SHARED_CACHE_MAP SharedCacheMap;
SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
DPRINT("CcRosInitializeFileCache(FileObject 0x%p, SharedCacheMap 0x%p)\n",
FileObject, SharedCacheMap);
Allocated = FALSE;
KeAcquireGuardedMutex(&ViewLock);
if (SharedCacheMap == NULL)
{
KIRQL OldIrql;
Allocated = TRUE;
SharedCacheMap = ExAllocateFromNPagedLookasideList(&SharedCacheMapLookasideList);
if (SharedCacheMap == NULL)
{
@ -1239,6 +1241,7 @@ CcRosInitializeFileCache (
SharedCacheMap->PinAccess = PinAccess;
SharedCacheMap->DirtyPageThreshold = 0;
SharedCacheMap->DirtyPages = 0;
InitializeListHead(&SharedCacheMap->PrivateList);
KeInitializeSpinLock(&SharedCacheMap->CacheMapLock);
InitializeListHead(&SharedCacheMap->CacheMapVacbListHead);
FileObject->SectionObjectPointer->SharedCacheMap = SharedCacheMap;
@ -1249,7 +1252,40 @@ CcRosInitializeFileCache (
}
if (FileObject->PrivateCacheMap == NULL)
{
FileObject->PrivateCacheMap = SharedCacheMap;
PPRIVATE_CACHE_MAP PrivateMap;
/* Allocate the private cache map for this handle */
PrivateMap = ExAllocatePoolWithTag(NonPagedPool, sizeof(PRIVATE_CACHE_MAP), 'cPcC');
if (PrivateMap == NULL)
{
/* If we also allocated the shared cache map for this file, kill it */
if (Allocated)
{
KeAcquireSpinLock(&iSharedCacheMapLock, &OldIrql);
RemoveEntryList(&SharedCacheMap->SharedCacheMapLinks);
KeReleaseSpinLock(&iSharedCacheMapLock, 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 = 0xFFF;
PrivateMap->FileObject = FileObject;
/* 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);

2
ntoskrnl/include/internal/cc.h
View file

@ -163,6 +163,7 @@ typedef struct _ROS_SHARED_CACHE_MAP
BOOLEAN PinAccess;
PCACHE_MANAGER_CALLBACKS Callbacks;
PVOID LazyWriteContext;
LIST_ENTRY PrivateList;
KSPIN_LOCK CacheMapLock;
ULONG OpenCount;
ULONG DirtyPages;
@ -255,6 +256,7 @@ typedef struct _WORK_QUEUE_ENTRY
extern LAZY_WRITER LazyWriter;
#define NODE_TYPE_DEFERRED_WRITE 0x02FC
#define NODE_TYPE_PRIVATE_MAP 0x02FE
VOID
NTAPI