[dcote] 25548: * Adding FsRtlCopyRead(), FsRtlCopyWrite() * Added #ifdef _NTIFS_INCLUDED_ typedef struct _SHARED_CACHE_MAP { definition to cctypes.h header file.
20 Jan
2007
20 Jan
'07
5:43 p.m.
Author: dcote
Date: Sat Jan 20 20:43:46 2007
New Revision: 25548
URL: http://svn.reactos.org/svn/reactos?rev=25548&view=rev
Log:
* Adding FsRtlCopyRead(), FsRtlCopyWrite()
* Added #ifdef _NTIFS_INCLUDED_
typedef struct _SHARED_CACHE_MAP {
definition to cctypes.h header file.
Modified:
trunk/reactos/include/ndk/cctypes.h
trunk/reactos/ntoskrnl/fsrtl/fastio.c
Modified: trunk/reactos/include/ndk/cctypes.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/include/ndk/cctypes.h?rev=…
==============================================================================
--- trunk/reactos/include/ndk/cctypes.h (original)
+++ trunk/reactos/include/ndk/cctypes.h Sat Jan 20 20:43:46 2007
@@ -34,6 +34,56 @@
extern ULONG NTSYSAPI CcFastReadResourceMiss;
extern ULONG NTSYSAPI CcFastReadNoWait;
-#endif
-#endif // _CCTYPES_H
+#ifdef _NTIFS_INCLUDED_
+
+typedef struct _SHARED_CACHE_MAP {
+ SHORT NodeTypeCode;
+ SHORT NodeByteSize;
+ ULONG OpenCount;
+ LARGE_INTEGER FileSize;
+ LIST_ENTRY BcbList;
+ LARGE_INTEGER SectionSize;
+ LARGE_INTEGER ValidDataLength;
+ LARGE_INTEGER ValidDataGoal;
+ PVACB InitialVacbs[4];
+ PVACB Vacbs;
+ PFILE_OBJECT FileObject;
+ PVACB ActiveVacb;
+ PVOID NeedToZero;
+ ULONG ActivePage;
+ ULONG NeedToZeroPage;
+ ULONG ActiveVacbSpinLock;
+ ULONG VacbActiveCount;
+ ULONG DirtyPages;
+ LIST_ENTRY SharedCacheMapLinks;
+ ULONG Flags;
+ ULONG Status;
+ PMCB Mbcb;
+ PVOID Section;
+ PKEVENT CreateEvent;
+ PKEVENT WaitOnActiveCount;
+ ULONG PagesToWrite;
+ LONGLONG BeyondLastFlush;
+ PCACHE_MANAGER_CALLBACKS Callbacks;
+ PVOID LazyWriteContext;
+ PLIST_ENTRY PrivateList;
+ PVOID LogHandle;
+ PVOID FlushToLsnRoutine;
+ ULONG DirtyPageThreshold;
+ ULONG LazyWritePassCount;
+ PCACHE_UNINITIALIZE_EVENT UninitializeEvent;
+ PVACB NeedToZeroVacb;
+ ULONG BcbSpinLock;
+ PVOID Reserved;
+ KEVENT Event;
+ /* FIX ME: This should be PEX_PUSH_LOCK */
+ PVOID VacbPushLock;
+ PPRIVATE_CACHE_MAP PrivateCacheMap;
+ } SHARED_CACHE_MAP;
+
+
+#endif /* _NTIFS_INCLUDED_ */
+#endif /* NTOS_MODE_USER */
+#endif /* _CCTYPES_H */
+
Modified: trunk/reactos/ntoskrnl/fsrtl/fastio.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/fsrtl/fastio.c?re…
==============================================================================
--- trunk/reactos/ntoskrnl/fsrtl/fastio.c (original)
+++ trunk/reactos/ntoskrnl/fsrtl/fastio.c Sat Jan 20 20:43:46 2007
@@ -11,6 +11,8 @@
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
+#include <ntifs.h>
+#include <cctypes.h>
/* PUBLIC FUNCTIONS **********************************************************/
@@ -27,11 +29,21 @@
/*
* @implemented
*/
+VOID
+NTAPI
+FsRtlIncrementCcFastReadNotPossible(VOID)
+{
+ CcFastReadNotPossible++;
+}
+
+/*
+ * @implemented
+ */
VOID
NTAPI
-FsRtlIncrementCcFastReadNotPossible(VOID)
-{
- CcFastReadNotPossible++;
+FsRtlIncrementCcFastReadWait(VOID)
+{
+ CcFastReadWait++;
}
/*
@@ -39,24 +51,25 @@
*/
VOID
NTAPI
-FsRtlIncrementCcFastReadWait(VOID)
-{
- CcFastReadWait++;
-}
-
-/*
- * @implemented
- */
-VOID
-NTAPI
FsRtlIncrementCcFastReadNoWait(VOID)
{
CcFastReadNoWait++;
}
-/*
- * @unimplemented
- */
+_SEH_FILTER(FsRtlCcCopyFilter)
+{
+ LONG ExceptionDisposition;
+
+ /* Check if this was an expected exception */
+ ExceptionDisposition = FsRtlIsNtstatusExpected(_SEH_GetExceptionCode() ?
+ EXCEPTION_EXECUTE_HANDLER :
+ EXCEPTION_CONTINUE_SEARCH);
+
+ /* Continue execution if we expected it, otherwise fail the call */
+ return ExceptionDisposition;
+}
+
+
BOOLEAN
NTAPI
FsRtlCopyRead(IN PFILE_OBJECT FileObject,
@@ -68,13 +81,162 @@
OUT PIO_STATUS_BLOCK IoStatus,
IN PDEVICE_OBJECT DeviceObject)
{
- KEBUGCHECK(0);
- return FALSE;
-}
-
-/*
- * @unimplemented
- */
+
+ PFSRTL_COMMON_FCB_HEADER FcbHeader;
+ LARGE_INTEGER Offset;
+ PFAST_IO_DISPATCH FastIoDispatch;
+ PDEVICE_OBJECT Device;
+ BOOLEAN Result = TRUE;
+ ULONG PageCount = COMPUTE_PAGES_SPANNED(FileOffset,Length);
+
+ PAGED_CODE();
+ ASSERT(FileObject);
+ ASSERT(FileObject->FsContext);
+
+ /* No actual read */
+ if (!Length)
+ {
+ /* Return success */
+ IoStatus->Status = STATUS_SUCCESS;
+ IoStatus->Information = 0;
+ return TRUE;
+ }
+
+ if (MAXLONGLONG < (LONGLONG) FileOffset->QuadPart + Length) {
+ IoStatus->Status = STATUS_INVALID_PARAMETER;
+ IoStatus->Information = 0;
+ return FALSE;
+ }
+
+ /* Get the offset and FCB header */
+ Offset.QuadPart = FileOffset->QuadPart + Length;
+ FcbHeader = (PFSRTL_COMMON_FCB_HEADER)FileObject->FsContext;
+
+
+ if (Wait) {
+ /* Use a Resource Acquire */
+ FsRtlEnterFileSystem();
+ CcFastReadWait++;
+ ExAcquireResourceSharedLite(FcbHeader->Resource, TRUE);
+ } else {
+ /* Acquire the resource without blocking */
+ /* Return false and the I/O manager will retry using the standard IRP method. */
+ /* Use a Resource Acquire */
+ FsRtlEnterFileSystem();
+ if (!ExAcquireResourceSharedLite(FcbHeader->Resource, FALSE)) {
+ FsRtlExitFileSystem();
+ FsRtlIncrementCcFastReadResourceMiss();
+ return FALSE;
+ }
+ }
+
+
+ /* Check if this is a fast I/O cached file */
+ if (!(FileObject->PrivateCacheMap) ||
+ (FcbHeader->IsFastIoPossible == FastIoIsNotPossible)) {
+ /* It's not, so fail */
+ Result = FALSE;
+ goto Cleanup;
+ }
+
+ /* Check if we need to find out if fast I/O is available */
+ if (FcbHeader->IsFastIoPossible == FastIoIsQuestionable)
+ {
+ /* Sanity check */
+ ASSERT(!KeIsExecutingDpc());
+
+ /* Get the Fast I/O table */
+ Device = IoGetRelatedDeviceObject(FileObject);
+ FastIoDispatch = Device->DriverObject->FastIoDispatch;
+
+ /* Sanity check */
+ ASSERT(FastIoDispatch != NULL);
+ ASSERT(FastIoDispatch->FastIoCheckIfPossible != NULL);
+
+ /* Ask the driver if we can do it */
+ if (!FastIoDispatch->FastIoCheckIfPossible(FileObject,
+ FileOffset,
+ Length,
+ TRUE,
+ LockKey,
+ TRUE,
+ IoStatus,
+ Device))
+ {
+ /* It's not, fail */
+ Result = FALSE;
+ goto Cleanup;
+ }
+ }
+
+ /* Check if we read too much */
+ if (Offset.QuadPart > FcbHeader->FileSize.QuadPart){
+ /* We did, check if the file offset is past the end */
+ if (FileOffset->QuadPart >= FcbHeader->FileSize.QuadPart){
+ /* Set end of file */
+ IoStatus->Status = STATUS_END_OF_FILE;
+ IoStatus->Information = 0;
+ goto Cleanup;
+ }
+
+ /* Otherwise, just normalize the length */
+ Length = (ULONG)(FcbHeader->FileSize.QuadPart - FileOffset->QuadPart);
+ }
+
+ /* Set this as top-level IRP */
+ PsGetCurrentThread()->TopLevelIrp = FSRTL_FAST_IO_TOP_LEVEL_IRP;
+
+ _SEH_TRY {
+ /* Make sure the IO and file size is below 4GB */
+ if (Wait && !(Offset.HighPart | FcbHeader->FileSize.HighPart )) {
+
+ /* Call the cache controller */
+ CcFastCopyRead (FileObject,FileOffset->LowPart,Length,PageCount,Buffer,IoStatus);
+ /* File was accessed */
+ FileObject->Flags |= FO_FILE_FAST_IO_READ;
+ if (IoStatus->Status != STATUS_END_OF_FILE) {
+ ASSERT(( FcbHeader->FileSize.QuadPart) >= (FileOffset->QuadPart +
IoStatus->Information));
+ }
+
+ } else {
+
+ /* Call the cache controller */
+ Result = CcCopyRead(FileObject, FileOffset, Length, Wait,Buffer, IoStatus);
+ /* File was accessed */
+ FileObject->Flags |= FO_FILE_FAST_IO_READ;
+ if (Result == TRUE) {
+ ASSERT( (IoStatus->Status == STATUS_END_OF_FILE) ||
+ ((LONGLONG)(FileOffset->QuadPart + IoStatus->Information) <=
FcbHeader->FileSize.QuadPart)
+ );
+ }
+ }
+
+ /* Update the current file offset */
+ if (Result == TRUE) {
+ FileObject->CurrentByteOffset.QuadPart += IoStatus->Information;
+ }
+ }
+ _SEH_EXCEPT(FsRtlCcCopyFilter) {
+ Result = FALSE;
+ } _SEH_END;
+
+ PsGetCurrentThread()->TopLevelIrp = 0;
+
+ /* Return to caller */
+Cleanup:
+
+ ExReleaseResourceLite(FcbHeader->Resource);
+ FsRtlExitFileSystem();
+
+ if (Result == FALSE) {
+ CcFastReadNotPossible += 1;
+ }
+
+ return Result;
+
+}
+
+
BOOLEAN
NTAPI
FsRtlCopyWrite(IN PFILE_OBJECT FileObject,
@@ -86,9 +248,437 @@
OUT PIO_STATUS_BLOCK IoStatus,
IN PDEVICE_OBJECT DeviceObject)
{
- KEBUGCHECK(0);
- return FALSE;
-}
+
+ BOOLEAN Result = TRUE;
+ PFAST_IO_DISPATCH FastIoDispatch;
+ PDEVICE_OBJECT Device;
+ PFSRTL_COMMON_FCB_HEADER FcbHeader;
+
+ /* WDK doc. Offset=0xffffffffffffffff indicates append to the end of file */
+ BOOLEAN FileOffsetAppend = ((FileOffset->HighPart == 0xffffffff) &&
(FileOffset->LowPart == 0xffffffff));
+ BOOLEAN ResourceAquiredShared = FALSE;
+
+ BOOLEAN b_4GB = FALSE;
+
+ BOOLEAN FileSizeModified = FALSE;
+ LARGE_INTEGER OldFileSize;
+ LARGE_INTEGER OldValidDataLength;
+
+ LARGE_INTEGER NewSize;
+ LARGE_INTEGER Offset;
+
+ PAGED_CODE();
+
+ ASSERT(FileObject);
+ ASSERT(FileObject->FsContext);
+
+ /* Initialize some of the vars and pointers */
+ NewSize.QuadPart = 0;
+ Offset.QuadPart = FileOffset->QuadPart + Length;
+ FcbHeader = (PFSRTL_COMMON_FCB_HEADER)FileObject->FsContext;
+
+ /* Nagar p.544 -- Check with Cc if we can write and check if the IO > 64kB (WDK
macro) */
+ if ( (CcCanIWrite(FileObject, Length,Wait, FALSE) == FALSE) ||
+ (CcCopyWriteWontFlush(FileObject,FileOffset,Length) == FALSE) ||
+ ((FileObject->Flags & FO_WRITE_THROUGH )== TRUE)
+ )
+ {
+ return FALSE;
+ }
+
+ /* No actual read */
+ if (!Length)
+ {
+ IoStatus->Status = STATUS_SUCCESS;
+ IoStatus->Information = Length;
+ return TRUE;
+ }
+
+ FsRtlEnterFileSystem();
+
+ /* Nagar p.544/545 -- The CcFastCopyWrite doesn't deal with filesize beyond
4GB*/
+ if (Wait && (FcbHeader->AllocationSize.HighPart == 0))
+ {
+ /* If the file offset is not past the file size, then we can acquire the lock
shared */
+ if ((FileOffsetAppend == FALSE) && (Offset.LowPart <=
FcbHeader->ValidDataLength.LowPart)){
+ ExAcquireResourceSharedLite(FcbHeader->Resource,TRUE);
+ ResourceAquiredShared = TRUE;
+ } else {
+ ExAcquireResourceExclusiveLite(FcbHeader->Resource,TRUE);
+ }
+
+ /* Nagar p.544/545 -- If we append, use the file size as offset. Also, check that
we aren't crossing the 4GB boundary */
+ if ((FileOffsetAppend == TRUE)) {
+ Offset.LowPart = FcbHeader->FileSize.LowPart;
+ NewSize.LowPart = FcbHeader->FileSize.LowPart + Length;
+ b_4GB = (NewSize.LowPart < FcbHeader->FileSize.LowPart);
+
+ } else {
+ Offset.LowPart = FileOffset->LowPart;
+ NewSize.LowPart = FileOffset->LowPart + Length;
+ b_4GB = ((NewSize.LowPart < FileOffset->LowPart) ||
(FileOffset->HighPart != 0));
+ }
+
+ /* Nagar p.544/545
+ Make sure that caching is initated.
+ That fast are allowed for this file stream.
+ That we are not extending past the allocated size
+ That we are not creating a hole bigger than 8k
+ That we are not crossing the 4GB boundary
+ */
+ if ( (FileObject->PrivateCacheMap != NULL) &&
+ (FcbHeader->IsFastIoPossible != FastIoIsNotPossible) &&
+ (FcbHeader->AllocationSize.LowPart >= NewSize.LowPart) &&
+ (Offset.LowPart < (FcbHeader->ValidDataLength.LowPart + 0x2000) )
&&
+ !b_4GB
+ )
+ {
+ /* If we are extending past the file size, we need to release the lock and
acquire it
+ exclusively, because we are going to need to update the FcbHeader */
+ if (ResourceAquiredShared && (NewSize.LowPart >
(FcbHeader->ValidDataLength.LowPart + 0x2000))) {
+ /* Then we need to acquire the resource exclusive */
+ ExReleaseResourceLite(FcbHeader->Resource);
+ ExAcquireResourceExclusiveLite(FcbHeader->Resource,TRUE);
+ if (FileOffsetAppend == TRUE) {
+ Offset.LowPart = FcbHeader->FileSize.LowPart; // ??
+ NewSize.LowPart = FcbHeader->FileSize.LowPart + Length;
+ /* Make sure we don't cross the 4GB boundary */
+ b_4GB = (NewSize.LowPart < Offset.LowPart);
+ }
+
+ /* Recheck some of the conditions since we let the lock go */
+ if ( (FileObject->PrivateCacheMap != NULL) &&
+ (FcbHeader->IsFastIoPossible != FastIoIsNotPossible) &&
+ (FcbHeader->AllocationSize.LowPart >= NewSize.LowPart) &&
+ (FcbHeader->AllocationSize.HighPart == 0) &&
+ !b_4GB
+ ) {
+ } else {
+ goto FailAndCleanup;
+ }
+ }
+
+ }else {
+ goto FailAndCleanup;
+ }
+
+ /* Check if we need to find out if fast I/O is available */
+ if (FcbHeader->IsFastIoPossible == FastIoIsQuestionable)
+ {
+ IO_STATUS_BLOCK FastIoCheckIfPossibleStatus;
+
+ /* Sanity check */
+ ASSERT(!KeIsExecutingDpc());
+
+ /* Get the Fast I/O table */
+ Device = IoGetRelatedDeviceObject(FileObject);
+ FastIoDispatch = Device->DriverObject->FastIoDispatch;
+
+ /* Sanity check */
+ ASSERT(FastIoDispatch != NULL);
+ ASSERT(FastIoDispatch->FastIoCheckIfPossible != NULL);
+
+ /* Ask the driver if we can do it */
+ if (!FastIoDispatch->FastIoCheckIfPossible(FileObject,
+ FileOffsetAppend?
&FcbHeader->FileSize:FileOffset,
+ Length,
+ TRUE,
+ LockKey,
+ FALSE,
+ &FastIoCheckIfPossibleStatus,
+ Device))
+ {
+ /* It's not, fail */
+ goto FailAndCleanup;
+ }
+ }
+
+ /* If we are going to extend the file then save the old file size
+ in case the operation fails
+ */
+ if (NewSize.LowPart > FcbHeader->FileSize.LowPart) {
+ FileSizeModified = TRUE;
+ OldFileSize.LowPart = FcbHeader->FileSize.LowPart;
+ OldValidDataLength.LowPart = FcbHeader->ValidDataLength.LowPart;
+ FcbHeader->FileSize.LowPart = NewSize.LowPart;
+ }
+
+ /* Set this as top-level IRP */
+ PsGetCurrentThread()->TopLevelIrp = FSRTL_FAST_IO_TOP_LEVEL_IRP;
+
+ _SEH_TRY {
+ if (Offset.LowPart > FcbHeader->ValidDataLength.LowPart) {
+ LARGE_INTEGER OffsetVar;
+ OffsetVar.LowPart = Offset.LowPart;
+ OffsetVar.HighPart = 0;
+ CcZeroData(FileObject,&FcbHeader->ValidDataLength,&OffsetVar,TRUE);
+ }
+
+ /* Call the cache manager */
+ CcFastCopyWrite(FileObject,Offset.LowPart,Length,Buffer);
+ }
+ _SEH_EXCEPT(FsRtlCcCopyFilter) {
+ Result = FALSE;
+ } _SEH_END;
+
+ /* Remove ourselves at the top level component after the IO is done */
+ PsGetCurrentThread()->TopLevelIrp = 0;
+
+ /* Did the operation succeed ? */
+ if (Result == TRUE) {
+ /* Update the valid file size if necessary */
+ if (NewSize.LowPart > FcbHeader->ValidDataLength.LowPart){
+ FcbHeader->ValidDataLength.LowPart = NewSize.LowPart ;
+ }
+
+ /* Flag the file as modified */
+ FileObject->Flags |= FO_FILE_MODIFIED;
+
+ /* Update the strucutres if the file size changed */
+ if (FileSizeModified) {
+ ((SHARED_CACHE_MAP*)
FileObject->SectionObjectPointer->SharedCacheMap)->FileSize.LowPart =
NewSize.LowPart;
+ FileObject->Flags |= FO_FILE_SIZE_CHANGED;
+ }
+
+ /* Update the file object current file offset */
+ FileObject->CurrentByteOffset.QuadPart = NewSize.LowPart;
+
+ } else {
+
+ /* Result == FALSE if we get here. */
+ if (FileSizeModified) {
+ /* If the file size was modified then restore the old file size */
+ if(FcbHeader->PagingIoResource != NULL) {
+ // Nagar P.544 Restore the old file size if operation didn't succeed.
+ ExAcquireResourceExclusiveLite(FcbHeader->PagingIoResource,TRUE);
+ FcbHeader->FileSize.LowPart = OldFileSize.LowPart;
+ FcbHeader->ValidDataLength.LowPart = OldValidDataLength.LowPart;
+ ExReleaseResourceLite(FcbHeader->PagingIoResource);
+ } else {
+ /* If there is no lock and do it without */
+ FcbHeader->FileSize.LowPart = OldFileSize.LowPart;
+ FcbHeader->ValidDataLength.LowPart = OldValidDataLength.LowPart;
+ }
+ } else {
+ }
+ }
+
+ goto Cleanup;
+
+ } else {
+
+ LARGE_INTEGER OldFileSize;
+
+ /* Sanity check */
+ ASSERT(!KeIsExecutingDpc());
+
+ // Nagar P.544
+ /* Check if we need to acquire the resource exclusive */
+ if ( (FileOffsetAppend == FALSE) &&
+ ( (FileOffset->QuadPart + Length) <= FcbHeader->ValidDataLength.QuadPart )
+ )
+ {
+ /* Acquire the resource shared */
+ if (!ExAcquireResourceSharedLite(FcbHeader->Resource,Wait)) {
+ goto FailAndCleanup;
+ }
+ ResourceAquiredShared =TRUE;
+ } else {
+ /* Acquire the resource exclusive */
+ if (!ExAcquireResourceExclusiveLite(FcbHeader->Resource,Wait)) {
+ goto FailAndCleanup;
+ }
+ }
+
+ /* Check if we are appending */
+ if (FileOffsetAppend == TRUE) {
+ Offset.QuadPart = FcbHeader->FileSize.QuadPart;
+ NewSize.QuadPart = FcbHeader->FileSize.QuadPart + Length;
+ } else {
+ Offset.QuadPart = FileOffset->QuadPart;
+ NewSize.QuadPart += FileOffset->QuadPart + Length;
+ }
+
+ /* Nagar p.544/545
+ Make sure that caching is initated.
+ That fast are allowed for this file stream.
+ That we are not extending past the allocated size
+ That we are not creating a hole bigger than 8k
+ */
+ if ( (FileObject->PrivateCacheMap != NULL) &&
+ (FcbHeader->IsFastIoPossible != FastIoIsNotPossible) &&
+ ((FcbHeader->ValidDataLength.QuadPart + 0x2000) > Offset.QuadPart) &&
+ (MAXLONGLONG > (Offset.QuadPart + Length)) &&
+ (FcbHeader->AllocationSize.QuadPart >= NewSize.QuadPart)
+ )
+ {
+ /* Check if we can keep the lock shared */
+ if (ResourceAquiredShared && (NewSize.QuadPart >
FcbHeader->ValidDataLength.QuadPart) ) {
+ ExReleaseResourceLite(FcbHeader->Resource);
+ if(!ExAcquireResourceExclusiveLite(FcbHeader->Resource,Wait)) {
+ goto LeaveCriticalAndFail;
+ }
+
+ /* Compute the offset and the new filesize */
+ if (FileOffsetAppend) {
+ Offset.QuadPart = FcbHeader->FileSize.QuadPart;
+ NewSize.QuadPart = FcbHeader->FileSize.QuadPart + Length;
+ }
+
+ /* Recheck the above points since we released and reacquire the lock
*/
+ if ( (FileObject->PrivateCacheMap != NULL) &&
+ (FcbHeader->IsFastIoPossible != FastIoIsNotPossible) &&
+ (FcbHeader->AllocationSize.QuadPart > NewSize.QuadPart)
+ ) {
+ /* Do nothing */
+ } else {
+ goto FailAndCleanup;
+ }
+ }
+
+ /* Check if we need to find out if fast I/O is available */
+ if (FcbHeader->IsFastIoPossible == FastIoIsQuestionable)
+ {
+ IO_STATUS_BLOCK FastIoCheckIfPossibleStatus;
+
+ /* Sanity check */
+ ASSERT(!KeIsExecutingDpc());
+
+ /* Get the Fast I/O table */
+ Device = IoGetRelatedDeviceObject(FileObject);
+ FastIoDispatch = Device->DriverObject->FastIoDispatch;
+
+ /* Sanity check */
+ ASSERT(FastIoDispatch != NULL);
+ ASSERT(FastIoDispatch->FastIoCheckIfPossible != NULL);
+
+ /* Ask the driver if we can do it */
+ if (!FastIoDispatch->FastIoCheckIfPossible(FileObject,
+ FileOffsetAppend?
&FcbHeader->FileSize:FileOffset,
+ Length,
+ TRUE,
+ LockKey,
+ FALSE,
+ &FastIoCheckIfPossibleStatus,
+ Device))
+ {
+ /* It's not, fail */
+ goto FailAndCleanup;
+ }
+ }
+
+
+ /* If we are going to modify the filesize, save the old fs in case the
operation fails */
+ if (NewSize.QuadPart > FcbHeader->FileSize.QuadPart) {
+ FileSizeModified = TRUE;
+ OldFileSize.QuadPart = FcbHeader->FileSize.QuadPart;
+ OldValidDataLength.QuadPart = FcbHeader->ValidDataLength.QuadPart;
+
+ /* If the high part of the filesize is going to change, grab the Paging IoResouce */
+ if (NewSize.HighPart != FcbHeader->FileSize.HighPart &&
FcbHeader->PagingIoResource) {
+ ExAcquireResourceExclusiveLite(FcbHeader->PagingIoResource, TRUE);
+ FcbHeader->FileSize.QuadPart = NewSize.QuadPart;
+ ExReleaseResourceLite(FcbHeader->PagingIoResource);
+ } else {
+ FcbHeader->FileSize.QuadPart = NewSize.QuadPart;
+ }
+ }
+
+ /* Nagar p.544 */
+ /* Set ourselves as top component */
+ PsGetCurrentThread()->TopLevelIrp = FSRTL_FAST_IO_TOP_LEVEL_IRP;
+ _SEH_TRY {
+ BOOLEAN CallCc = TRUE;
+ /* Check if there is a gap between the end of the file and the offset
+ If yes, then we have to zero the data
+ */
+ if (Offset.QuadPart > FcbHeader->ValidDataLength.QuadPart) {
+ if (!(Result =
CcZeroData(FileObject,&FcbHeader->ValidDataLength,&Offset,Wait))) {
+ /* If this operation fails, then we have to exit
+ We can jump outside the SEH, so I a using a variable to exit
+ normally
+ */
+ CallCc = FALSE;
+ }
+ }
+
+ /* Unless the CcZeroData failed, call the cache manager */
+ if (CallCc) {
+ Result = CcCopyWrite(FileObject,&Offset,Length, Wait, Buffer);
+ }
+ }_SEH_EXCEPT(FsRtlCcCopyFilter) {
+ Result = FALSE;
+ } _SEH_END;
+
+ /* Reset the top component */
+ PsGetCurrentThread()->TopLevelIrp = FSRTL_FAST_IO_TOP_LEVEL_IRP;
+
+ /* Did the operation suceeded */
+ if (Result) {
+ /* Check if we need to update the filesize */
+ if (NewSize.QuadPart > FcbHeader->ValidDataLength.QuadPart) {
+ if (NewSize.HighPart != FcbHeader->ValidDataLength.HighPart &&
FcbHeader->PagingIoResource) {
+ ExAcquireResourceExclusiveLite(FcbHeader->PagingIoResource, TRUE);
+ FcbHeader->ValidDataLength.QuadPart = NewSize.QuadPart;
+ ExReleaseResourceLite(FcbHeader->PagingIoResource);
+ } else {
+ FcbHeader->ValidDataLength.QuadPart = NewSize.QuadPart;
+ }
+
+ /* Flag the file as modified */
+ FileObject->Flags |= FO_FILE_MODIFIED;
+ /* Check if the filesize has changed */
+ if (FileSizeModified) {
+ /* Update the file sizes */
+ ((SHARED_CACHE_MAP*)
FileObject->SectionObjectPointer->SharedCacheMap)->FileSize.QuadPart =
NewSize.QuadPart;
+ FileObject->Flags |= FO_FILE_SIZE_CHANGED;
+ }
+ /* Update the current FO byte offset */
+ FileObject->CurrentByteOffset.QuadPart = NewSize.QuadPart;
+ }
+ }
+ else
+ {
+ /* The operation did not succeed
+ Reset the file size to what it should be
+ */
+ if (FileSizeModified) {
+ if (FcbHeader->PagingIoResource) {
+ ExAcquireResourceExclusiveLite(FcbHeader->PagingIoResource, TRUE);
+ FcbHeader->FileSize.QuadPart = OldFileSize.QuadPart;
+ FcbHeader->ValidDataLength.QuadPart = OldValidDataLength.QuadPart;
+ ExReleaseResourceLite(FcbHeader->PagingIoResource);
+ }else{
+ FcbHeader->FileSize.QuadPart = OldFileSize.QuadPart;
+ FcbHeader->ValidDataLength.QuadPart = OldValidDataLength.QuadPart;
+ }
+ }
+ }
+ goto Cleanup;
+ } else {
+ goto FailAndCleanup;
+ }
+
+ ASSERT(0);
+ }
+
+LeaveCriticalAndFail:
+ FsRtlExitFileSystem();
+ return FALSE;
+
+
+FailAndCleanup:
+
+ ExReleaseResourceLite(FcbHeader->Resource);
+ FsRtlExitFileSystem();
+ return FALSE;
+
+Cleanup:
+
+ ExReleaseResourceLite(FcbHeader->Resource);
+ FsRtlExitFileSystem();
+ return Result;
+}
/*
* @implemented
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