16 Nov
2009
16 Nov
'09
1:56 a.m.
Author: dgorbachev
Date: Mon Nov 16 02:56:48 2009
New Revision: 44196
URL: http://svn.reactos.org/svn/reactos?rev=44196&view=rev
Log:
Break long expressions, fix formatting.
Modified:
trunk/reactos/ntoskrnl/fsrtl/fastio.c
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 [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/fsrtl/fastio.c [iso-8859-1] Mon Nov 16 02:56:48 2009
@@ -74,9 +74,9 @@
PFAST_IO_DISPATCH FastIoDispatch;
PDEVICE_OBJECT Device;
BOOLEAN Result = TRUE;
- ULONG PageCount = ADDRESS_AND_SIZE_TO_SPAN_PAGES(FileOffset,Length);
-
- PAGED_CODE();
+ ULONG PageCount = ADDRESS_AND_SIZE_TO_SPAN_PAGES(FileOffset, Length);
+
+ PAGED_CODE();
ASSERT(FileObject);
ASSERT(FileObject->FsContext);
@@ -89,41 +89,45 @@
return TRUE;
}
- if (MAXLONGLONG < (LONGLONG) FileOffset->QuadPart + Length) {
- IoStatus->Status = STATUS_INVALID_PARAMETER;
- IoStatus->Information = 0;
- return FALSE;
+ 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) {
+ if (Wait)
+ {
/* Use a Resource Acquire */
FsRtlEnterFileSystem();
- CcFastReadWait++;
+ 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 */
+ }
+ 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;
- }
- }
-
+ 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)) {
+ (FcbHeader->IsFastIoPossible == FastIoIsNotPossible))
+ {
/* It's not, so fail */
- Result = FALSE;
- goto Cleanup;
+ Result = FALSE;
+ goto Cleanup;
}
/* Check if we need to find out if fast I/O is available */
@@ -134,7 +138,7 @@
/* Get the Fast I/O table */
Device = IoGetRelatedDeviceObject(FileObject);
- FastIoDispatch = Device->DriverObject->FastIoDispatch;
+ FastIoDispatch = Device->DriverObject->FastIoDispatch;
/* Sanity check */
ASSERT(FastIoDispatch != NULL);
@@ -154,12 +158,14 @@
Result = FALSE;
goto Cleanup;
}
- }
+ }
/* Check if we read too much */
- if (Offset.QuadPart > FcbHeader->FileSize.QuadPart){
+ if (Offset.QuadPart > FcbHeader->FileSize.QuadPart)
+ {
/* We did, check if the file offset is past the end */
- if (FileOffset->QuadPart >= FcbHeader->FileSize.QuadPart){
+ if (FileOffset->QuadPart >= FcbHeader->FileSize.QuadPart)
+ {
/* Set end of file */
IoStatus->Status = STATUS_END_OF_FILE;
IoStatus->Information = 0;
@@ -171,45 +177,67 @@
}
/* Set this as top-level IRP */
- PsGetCurrentThread()->TopLevelIrp = FSRTL_FAST_IO_TOP_LEVEL_IRP;
-
- _SEH2_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 {
+ PsGetCurrentThread()->TopLevelIrp = FSRTL_FAST_IO_TOP_LEVEL_IRP;
+
+ _SEH2_TRY
+ {
+ /* Make sure the IO and file size is below 4GB */
+ if (Wait && !(Offset.HighPart | FcbHeader->FileSize.HighPart))
+ {
/* Call the cache controller */
- Result = CcCopyRead(FileObject, FileOffset, Length, Wait,Buffer, IoStatus);
+ CcFastCopyRead(FileObject,
+ FileOffset->LowPart,
+ Length,
+ PageCount,
+ 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)
- );
- }
- }
+ 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;
- }
- }
- _SEH2_EXCEPT(FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
- {
- Result = FALSE;
- } _SEH2_END;
-
- PsGetCurrentThread()->TopLevelIrp = 0;
+ if (Result == TRUE)
+ {
+ FileObject->CurrentByteOffset.QuadPart += IoStatus->Information;
+ }
+ }
+ _SEH2_EXCEPT(FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
+ EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
+ {
+ Result = FALSE;
+ }
+ _SEH2_END;
+
+ PsGetCurrentThread()->TopLevelIrp = 0;
/* Return to caller */
Cleanup:
@@ -217,12 +245,12 @@
ExReleaseResourceLite(FcbHeader->Resource);
FsRtlExitFileSystem();
- if (Result == FALSE) {
+ if (Result == FALSE)
+ {
CcFastReadNotPossible += 1;
- }
+ }
return Result;
-
}
@@ -240,22 +268,23 @@
OUT PIO_STATUS_BLOCK IoStatus,
IN PDEVICE_OBJECT DeviceObject)
{
-
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 == (LONG)0xffffffff) &&
(FileOffset->LowPart == 0xffffffff));
+ PSHARED_CACHE_MAP SharedCacheMap;
+
+ /* WDK doc.
+ * Offset == 0xffffffffffffffff indicates append to the end of file.
+ */
+ BOOLEAN FileOffsetAppend = (FileOffset->HighPart == (LONG)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;
@@ -269,13 +298,14 @@
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;
+ /* 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 */
@@ -288,385 +318,477 @@
FsRtlEnterFileSystem();
- /* Nagar p.544/545 -- The CcFastCopyWrite doesn't deal with filesize beyond
4GB*/
+ /* 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);
- }
+ /* 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;
-
- _SEH2_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);
- }
- _SEH2_EXCEPT(FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
- {
- Result = FALSE;
- } _SEH2_END;
+ if ((FileObject->PrivateCacheMap != NULL) &&
+ (FcbHeader->IsFastIoPossible != FastIoIsNotPossible) &&
+ (FcbHeader->AllocationSize.LowPart >= NewSize.LowPart)
&&
+ (FcbHeader->AllocationSize.HighPart == 0) &&
+ !b_4GB)
+ {
+ /* Do nothing? */
+ }
+ 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;
+
+ _SEH2_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);
+ }
+ _SEH2_EXCEPT(FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
+ EXCEPTION_EXECUTE_HANDLER :
+ EXCEPTION_CONTINUE_SEARCH)
+ {
+ Result = FALSE;
+ }
+ _SEH2_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 ;
- }
+ 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;
- }
+ FileObject->Flags |= FO_FILE_MODIFIED;
+
+ /* Update the strucutres if the file size changed */
+ if (FileSizeModified)
+ {
+ SharedCacheMap =
+
(PSHARED_CACHE_MAP)FileObject->SectionObjectPointer->SharedCacheMap;
+ 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 LeaveCriticalAndFail;
- }
- ResourceAquiredShared =TRUE;
- } else {
- /* Acquire the resource exclusive */
- if (!ExAcquireResourceExclusiveLite(FcbHeader->Resource,Wait)) {
- goto LeaveCriticalAndFail;
- }
- }
-
- /* 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;
- }
+ 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
+ {
+ /* Do nothing? */
+ }
+ }
+
+ 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 LeaveCriticalAndFail;
+ }
+ ResourceAquiredShared = TRUE;
+ }
+ else
+ {
+ /* Acquire the resource exclusive */
+ if (!ExAcquireResourceExclusiveLite(FcbHeader->Resource, Wait))
+ {
+ goto LeaveCriticalAndFail;
+ }
+ }
+
+ /* 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;
- _SEH2_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;
- }
- }
+ 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;
+
+ _SEH2_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);
- }
- }_SEH2_EXCEPT(FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
- {
- Result = FALSE;
- } _SEH2_END;
+ if (CallCc)
+ {
+ Result = CcCopyWrite(FileObject, &Offset, Length, Wait, Buffer);
+ }
+ }
+ _SEH2_EXCEPT(FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
+ EXCEPTION_EXECUTE_HANDLER :
+ EXCEPTION_CONTINUE_SEARCH)
+ {
+ Result = FALSE;
+ }
+ _SEH2_END;
/* Reset the top component */
- PsGetCurrentThread()->TopLevelIrp = FSRTL_FAST_IO_TOP_LEVEL_IRP;
+ 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;
- }
- }
+ 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);
- }
+ FileObject->Flags |= FO_FILE_MODIFIED;
+
+ /* Check if the filesize has changed */
+ if (FileSizeModified)
+ {
+ /* Update the file sizes */
+ SharedCacheMap =
+
(PSHARED_CACHE_MAP)FileObject->SectionObjectPointer->SharedCacheMap;
+ 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;
+ }
+ }
LeaveCriticalAndFail:
+
FsRtlExitFileSystem();
return FALSE;
-
FailAndCleanup:
@@ -686,7 +808,7 @@
*/
NTSTATUS
NTAPI
-FsRtlGetFileSize(IN PFILE_OBJECT FileObject,
+FsRtlGetFileSize(IN PFILE_OBJECT FileObject,
IN OUT PLARGE_INTEGER FileSize)
{
FILE_STANDARD_INFORMATION Info;
@@ -699,30 +821,35 @@
PIRP Irp;
BOOLEAN OldHardError;
-
PAGED_CODE();
/* Get Device Object and Fast Calls */
DeviceObject = IoGetRelatedDeviceObject(FileObject);
FastDispatch = DeviceObject->DriverObject->FastIoDispatch;
- /* Check if we support Fast Calls, and check FastIoQueryStandardInfo */
- /* Call the function and see if it succeeds */
- if ( !FastDispatch ||
- !FastDispatch->FastIoQueryStandardInfo ||
- !FastDispatch->FastIoQueryStandardInfo(FileObject,TRUE,
- &Info,&IoStatus,DeviceObject))
- {
- /* If any of the above failed, then we are going to send an IRP to the device
object */
- /* Initialize the even for the IO */
- KeInitializeEvent(&Event,NotificationEvent,FALSE);
+ /* Check if we support Fast Calls, and check FastIoQueryStandardInfo.
+ * Call the function and see if it succeeds.
+ */
+ if (!FastDispatch ||
+ !FastDispatch->FastIoQueryStandardInfo ||
+ !FastDispatch->FastIoQueryStandardInfo(FileObject,
+ TRUE,
+ &Info,
+ &IoStatus,
+ DeviceObject))
+ {
+ /* If any of the above failed, then we are going to send an
+ * IRP to the device object. Initialize the event for the IO.
+ */
+ KeInitializeEvent(&Event, NotificationEvent, FALSE);
+
/* Allocate the IRP */
- Irp = IoAllocateIrp(DeviceObject->StackSize,FALSE);
+ Irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
+
if (Irp == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
-
/* Don't process hard error */
OldHardError = IoSetThreadHardErrorMode(FALSE);
@@ -742,16 +869,18 @@
IoStackLocation->MajorFunction = IRP_MJ_QUERY_INFORMATION;
IoStackLocation->FileObject = FileObject;
IoStackLocation->DeviceObject = DeviceObject;
- IoStackLocation->Parameters.QueryFile.Length =
ALIGN_UP(sizeof(FILE_INFORMATION_CLASS),ULONG);
- IoStackLocation->Parameters.QueryFile.FileInformationClass =
FileStandardInformation;
+ IoStackLocation->Parameters.QueryFile.Length =
+ ALIGN_UP(sizeof(FILE_INFORMATION_CLASS), ULONG);
+ IoStackLocation->Parameters.QueryFile.FileInformationClass =
+ FileStandardInformation;
/* Send the IRP to the related device object */
- Status = IoCallDriver(DeviceObject,Irp);
+ Status = IoCallDriver(DeviceObject, Irp);
/* Standard DDK IRP result processing */
if (Status == STATUS_PENDING)
{
- KeWaitForSingleObject(&Event,Executive,KernelMode,FALSE,NULL);
+ KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
}
/* If there was a synchronous error, signal it */
@@ -766,7 +895,7 @@
/* Check the sync/async IO result */
if (NT_SUCCESS(IoStatus.Status))
{
- /* Was the request for a directory ? */
+ /* Was the request for a directory? */
if (Info.Directory)
{
IoStatus.Status = STATUS_FILE_IS_A_DIRECTORY;
@@ -779,7 +908,6 @@
return IoStatus.Status;
}
-
/*
* @implemented
@@ -818,8 +946,7 @@
FastDispatch = BaseDeviceObject->DriverObject->FastIoDispatch;
/* If the Base Device Object has its own FastDispatch Routine, fail */
- if (FastDispatch && FastDispatch->MdlRead &&
- BaseDeviceObject != DeviceObject)
+ if (FastDispatch && FastDispatch->MdlRead && BaseDeviceObject !=
DeviceObject)
{
return FALSE;
}
@@ -853,9 +980,7 @@
if (FastDispatch && FastDispatch->MdlReadComplete)
{
/* Use the fast path */
- return FastDispatch->MdlReadComplete(FileObject,
- MdlChain,
- DeviceObject);
+ return FastDispatch->MdlReadComplete(FileObject, MdlChain, DeviceObject);
}
/* Get the Base File System (Volume) and Fast Calls */
@@ -863,8 +988,9 @@
FastDispatch = BaseDeviceObject->DriverObject->FastIoDispatch;
/* If the Base Device Object has its own FastDispatch Routine, fail */
- if ((BaseDeviceObject != DeviceObject) && FastDispatch
- && FastDispatch->MdlReadComplete)
+ if ((BaseDeviceObject != DeviceObject) &&
+ FastDispatch &&
+ FastDispatch->MdlReadComplete)
{
return FALSE;
}
@@ -876,8 +1002,8 @@
/*
* @implemented
*/
- BOOLEAN
- NTAPI
+BOOLEAN
+NTAPI
FsRtlMdlReadCompleteDev(IN PFILE_OBJECT FileObject,
IN PMDL MemoryDescriptorList,
IN PDEVICE_OBJECT DeviceObject)
@@ -886,7 +1012,6 @@
CcMdlReadComplete2(MemoryDescriptorList, FileObject);
return TRUE;
}
-
/*
* @implemented
@@ -995,10 +1120,13 @@
CcMdlRead(FileObject, FileOffset, Length, MdlChain, IoStatus);
FileObject->Flags |= FO_FILE_FAST_IO_READ;
}
- _SEH2_EXCEPT(FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
- {
- Result = FALSE;
- } _SEH2_END;
+ _SEH2_EXCEPT(FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
+ EXCEPTION_EXECUTE_HANDLER :
+ EXCEPTION_CONTINUE_SEARCH)
+ {
+ Result = FALSE;
+ }
+ _SEH2_END;
/* Remove the top-level IRP flag */
@@ -1006,8 +1134,10 @@
/* Return to caller */
Cleanup:
+
ExReleaseResourceLite(FcbHeader->Resource);
FsRtlExitFileSystem();
+
return Result;
}
@@ -1042,7 +1172,8 @@
FastDispatch = BaseDeviceObject->DriverObject->FastIoDispatch;
/* If the Base Device Object has its own FastDispatch Routine, fail */
- if (FastDispatch && FastDispatch->MdlWriteComplete &&
+ if (FastDispatch &&
+ FastDispatch->MdlWriteComplete &&
BaseDeviceObject != DeviceObject)
{
return FALSE;
@@ -1067,12 +1198,11 @@
{
if (FileObject->Flags & FO_WRITE_THROUGH)
{
- return FALSE;
- }
-
+ return FALSE;
+ }
/* Call the Cache Manager */
- CcMdlWriteComplete2(FileObject,FileOffset,MdlChain);
+ CcMdlWriteComplete2(FileObject, FileOffset, MdlChain);
return TRUE;
}
@@ -1113,7 +1243,8 @@
FastDispatch = BaseDeviceObject->DriverObject->FastIoDispatch;
/* If the Base Device Object has its own FastDispatch Routine, fail */
- if (FastDispatch && FastDispatch->PrepareMdlWrite &&
+ if (FastDispatch &&
+ FastDispatch->PrepareMdlWrite &&
BaseDeviceObject != DeviceObject)
{
return FALSE;
@@ -1146,14 +1277,19 @@
PFAST_IO_DISPATCH FastIoDispatch;
PDEVICE_OBJECT Device;
PFSRTL_COMMON_FCB_HEADER FcbHeader;
+ PSHARED_CACHE_MAP SharedCacheMap;
LARGE_INTEGER OldFileSize;
LARGE_INTEGER OldValidDataLength;
LARGE_INTEGER NewSize;
LARGE_INTEGER Offset;
- /* WDK doc. Offset=0xffffffffffffffff indicates append to the end of file */
- BOOLEAN FileOffsetAppend = ((FileOffset->HighPart == (LONG)0xffffffff) &&
(FileOffset->LowPart == 0xffffffff));
+ /* WDK doc.
+ * Offset == 0xffffffffffffffff indicates append to the end of file.
+ */
+ BOOLEAN FileOffsetAppend = (FileOffset->HighPart == (LONG)0xffffffff) &&
+ (FileOffset->LowPart == 0xffffffff);
+
BOOLEAN FileSizeModified = FALSE;
BOOLEAN ResourceAquiredShared = FALSE;
@@ -1165,11 +1301,13 @@
Offset.QuadPart = FileOffset->QuadPart + Length;
- /* Nagar p.544 -- Check with Cc if we can write */
- if ( (!CcCanIWrite(FileObject, Length,TRUE,FALSE))||
- (FileObject->Flags & FO_WRITE_THROUGH))
- {
- return FALSE;
+ /* Nagar p.544.
+ * Check with Cc if we can write.
+ */
+ if (!CcCanIWrite(FileObject, Length, TRUE, FALSE) ||
+ (FileObject->Flags & FO_WRITE_THROUGH))
+ {
+ return FALSE;
}
IoStatus->Status = STATUS_SUCCESS;
@@ -1184,180 +1322,218 @@
FsRtlEnterFileSystem();
/* Check we are going to extend the file */
- if ( (FileOffsetAppend == FALSE) &&
- ( (FileOffset->QuadPart + Length) <= FcbHeader->ValidDataLength.QuadPart )
- )
- {
- /* Acquire the resource shared */
- ExAcquireResourceSharedLite(FcbHeader->Resource,TRUE);
- ResourceAquiredShared =TRUE;
- } else
- {
- /* Acquire the resource exclusive */
- ExAcquireResourceExclusiveLite(FcbHeader->Resource,TRUE);
- }
-
- /* 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;
- }
-
- if ( (FileObject->PrivateCacheMap) &&
- (FcbHeader->IsFastIoPossible) &&
- (MAXLONGLONG >= (LONGLONG) FileOffset->QuadPart + Length) &&
- (NewSize.QuadPart <= FcbHeader->AllocationSize.QuadPart) )
+ if ((FileOffsetAppend == FALSE) &&
+ (FileOffset->QuadPart + Length <= FcbHeader->ValidDataLength.QuadPart))
+ {
+ /* Acquire the resource shared */
+ ExAcquireResourceSharedLite(FcbHeader->Resource, TRUE);
+ ResourceAquiredShared = TRUE;
+ }
+ else
+ {
+ /* Acquire the resource exclusive */
+ ExAcquireResourceExclusiveLite(FcbHeader->Resource, TRUE);
+ }
+
+ /* 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;
+ }
+
+ if ((FileObject->PrivateCacheMap) &&
+ (FcbHeader->IsFastIoPossible) &&
+ (MAXLONGLONG >= (LONGLONG) FileOffset->QuadPart + Length) &&
+ (NewSize.QuadPart <= FcbHeader->AllocationSize.QuadPart))
{
/* Check if we can keep the lock shared */
- if (ResourceAquiredShared && (NewSize.QuadPart >
FcbHeader->ValidDataLength.QuadPart) ) {
- ExReleaseResourceLite(FcbHeader->Resource);
- ExAcquireResourceExclusiveLite(FcbHeader->Resource,TRUE);
+ if (ResourceAquiredShared &&
+ (NewSize.QuadPart > FcbHeader->ValidDataLength.QuadPart))
+ {
+ ExReleaseResourceLite(FcbHeader->Resource);
+ ExAcquireResourceExclusiveLite(FcbHeader->Resource, TRUE);
/* 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)
- {
- /* 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,
- FALSE,
- IoStatus,
- 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;
- _SEH2_TRY
- {
- /* 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) {
- Result = CcZeroData(FileObject,&FcbHeader->ValidDataLength,&Offset,TRUE);
- if (Result)
- {
- CcPrepareMdlWrite(FileObject,&Offset,Length,MdlChain,IoStatus);
- }
- } else {
- CcPrepareMdlWrite(FileObject,&Offset,Length,MdlChain,IoStatus);
- }
-
- }_SEH2_EXCEPT(FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
- {
- Result = FALSE;
- } _SEH2_END;
+ 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)
+ {
+ /* 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,
+ FALSE,
+ IoStatus,
+ 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;
+ _SEH2_TRY
+ {
+ /* 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)
+ {
+ Result = CcZeroData(FileObject,
+ &FcbHeader->ValidDataLength,
+ &Offset,
+ TRUE);
+ if (Result)
+ {
+ CcPrepareMdlWrite(FileObject,
+ &Offset,
+ Length,
+ MdlChain,
+ IoStatus);
+ }
+ }
+ else
+ {
+ CcPrepareMdlWrite(FileObject, &Offset, Length, MdlChain, IoStatus);
+ }
+
+ }
+ _SEH2_EXCEPT(FsRtlIsNtstatusExpected(_SEH2_GetExceptionCode()) ?
+ EXCEPTION_EXECUTE_HANDLER :
+ EXCEPTION_CONTINUE_SEARCH)
+ {
+ Result = FALSE;
+ }
+ _SEH2_END;
/* Reset the top component */
- PsGetCurrentThread()->TopLevelIrp = 0;
+ PsGetCurrentThread()->TopLevelIrp = 0;
/* 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;
- }
- }
+ 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;
- }
-
- }
- 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;
-
+ FileObject->Flags |= FO_FILE_MODIFIED;
+
+ /* Check if the filesize has changed */
+ if (FileSizeModified)
+ {
+ SharedCacheMap =
+
(PSHARED_CACHE_MAP)FileObject->SectionObjectPointer->SharedCacheMap;
+ SharedCacheMap->FileSize.QuadPart = NewSize.QuadPart;
+ FileObject->Flags |= FO_FILE_SIZE_CHANGED;
+ }
+ }
+ 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;
}
-
FailAndCleanup:
@@ -1370,7 +1546,6 @@
ExReleaseResourceLite(FcbHeader->Resource);
FsRtlExitFileSystem();
return Result;
-
}
/*
@@ -1380,10 +1555,8 @@
NTAPI
FsRtlAcquireFileExclusive(IN PFILE_OBJECT FileObject)
{
- /*
- PAGED_CODE();
- FsRtlAcquireFileExclusiveCommon(FileObject,0,0);
- */
+ /* PAGED_CODE(); */
+ /* FsRtlAcquireFileExclusiveCommon(FileObject, 0, 0); */
KeBugCheck(FILE_SYSTEM);
}
@@ -1394,7 +1567,6 @@
NTAPI
FsRtlReleaseFile(IN PFILE_OBJECT FileObject)
{
-
KeBugCheck(FILE_SYSTEM);
}
@@ -1423,4 +1595,3 @@
UNIMPLEMENTED;
return STATUS_NOT_IMPLEMENTED;
}
-