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NT4/private/ntos/fastfat/create.c
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/*++
Copyright (c) 1989 Microsoft Corporation
Module Name:
Create.c
Abstract:
This module implements the File Create routine for Fat called by the
dispatch driver.
Author:
Gary Kimura [GaryKi] 28-Dec-1989
Revision History:
--*/
#include "FatProcs.h"
//
// The Bug check file id for this module
//
#define BugCheckFileId (FAT_BUG_CHECK_CREATE)
//
// The debug trace level
//
#define Dbg (DEBUG_TRACE_CREATE)
//
// Macros for incrementing performance counters.
//
#define CollectCreateHitStatistics(VCB) { \
PFILESYSTEM_STATISTICS Stats = &(VCB)->Statistics[KeGetCurrentProcessorNumber()]; \
Stats->Fat.CreateHits += 1; \
}
#define CollectCreateStatistics(VCB,STATUS) { \
PFILESYSTEM_STATISTICS Stats = &(VCB)->Statistics[KeGetCurrentProcessorNumber()]; \
if ((STATUS) == STATUS_SUCCESS) { \
Stats->Fat.SuccessfulCreates += 1; \
} else { \
Stats->Fat.FailedCreates += 1; \
} \
}
LUID FatSecurityPrivilege = { SE_SECURITY_PRIVILEGE, 0 };
//
// local procedure prototypes
//
IO_STATUS_BLOCK
FatOpenVolume (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG CreateDisposition
);
IO_STATUS_BLOCK
FatOpenRootDcb (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG CreateDisposition
);
IO_STATUS_BLOCK
FatOpenExistingDcb (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PDCB Dcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG CreateDisposition,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN DeleteOnClose
);
IO_STATUS_BLOCK
FatOpenExistingFcb (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PFCB Fcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG AllocationSize,
IN PFILE_FULL_EA_INFORMATION EaBuffer,
IN ULONG EaLength,
IN UCHAR FileAttributes,
IN ULONG CreateDisposition,
IN BOOLEAN DeleteOnClose,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN FileNameOpenedDos,
OUT PBOOLEAN OplockPostIrp
);
IO_STATUS_BLOCK
FatOpenTargetDirectory (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PDCB Dcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN BOOLEAN DoesNameExist
);
IO_STATUS_BLOCK
FatOpenExistingDirectory (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PDCB ParentDcb,
IN PDIRENT Dirent,
IN ULONG LfnByteOffset,
IN ULONG DirentByteOffset,
IN PUNICODE_STRING Lfn,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG CreateDisposition,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN DeleteOnClose
);
IO_STATUS_BLOCK
FatOpenExistingFile (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PDCB ParentDcb,
IN PDIRENT Dirent,
IN ULONG LfnByteOffset,
IN ULONG DirentByteOffset,
IN PUNICODE_STRING Lfn,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG AllocationSize,
IN PFILE_FULL_EA_INFORMATION EaBuffer,
IN ULONG EaLength,
IN UCHAR FileAttributes,
IN ULONG CreateDisposition,
IN BOOLEAN IsPagingFile,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN DeleteOnClose,
IN BOOLEAN FileNameOpenedDos
);
IO_STATUS_BLOCK
FatCreateNewDirectory (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PDCB ParentDcb,
IN POEM_STRING OemName,
IN PUNICODE_STRING UnicodeName,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN PFILE_FULL_EA_INFORMATION EaBuffer,
IN ULONG EaLength,
IN UCHAR FileAttributes,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN DeleteOnClose
);
IO_STATUS_BLOCK
FatCreateNewFile (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PDCB ParentDcb,
IN POEM_STRING OemName,
IN PUNICODE_STRING UnicodeName,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG AllocationSize,
IN PFILE_FULL_EA_INFORMATION EaBuffer,
IN ULONG EaLength,
IN UCHAR FileAttributes,
IN PUNICODE_STRING LfnBuffer,
IN BOOLEAN IsPagingFile,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN DeleteOnClose,
IN BOOLEAN TemporaryFile
);
IO_STATUS_BLOCK
FatSupersedeOrOverwriteFile (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PFCB Fcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG AllocationSize,
IN PFILE_FULL_EA_INFORMATION EaBuffer,
IN ULONG EaLength,
IN UCHAR FileAttributes,
IN ULONG CreateDisposition,
IN BOOLEAN NoEaKnowledge
);
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, FatCommonCreate)
#pragma alloc_text(PAGE, FatCreateNewDirectory)
#pragma alloc_text(PAGE, FatCreateNewFile)
#pragma alloc_text(PAGE, FatFsdCreate)
#pragma alloc_text(PAGE, FatOpenExistingDcb)
#pragma alloc_text(PAGE, FatOpenExistingDirectory)
#pragma alloc_text(PAGE, FatOpenExistingFcb)
#pragma alloc_text(PAGE, FatOpenExistingFile)
#pragma alloc_text(PAGE, FatOpenRootDcb)
#pragma alloc_text(PAGE, FatOpenTargetDirectory)
#pragma alloc_text(PAGE, FatOpenVolume)
#pragma alloc_text(PAGE, FatSupersedeOrOverwriteFile)
#pragma alloc_text(PAGE, FatSelectNames)
#pragma alloc_text(PAGE, FatSetFullNameInFcb)
#endif
NTSTATUS
FatFsdCreate (
IN PVOLUME_DEVICE_OBJECT VolumeDeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
This routine implements the FSD part of the NtCreateFile and NtOpenFile
API calls.
Arguments:
VolumeDeviceObject - Supplies the volume device object where the
file/directory exists that we are trying to open/create
Irp - Supplies the Irp being processed
Return Value:
NTSTATUS - The Fsd status for the Irp
--*/
{
NTSTATUS Status;
PIRP_CONTEXT IrpContext = NULL;
BOOLEAN TopLevel;
//
// If we were called with our file system device object instead of a
// volume device object, just complete this request with STATUS_SUCCESS
//
if (VolumeDeviceObject->DeviceObject.Size == (USHORT)sizeof(DEVICE_OBJECT)) {
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = FILE_OPENED;
IoCompleteRequest( Irp, IO_DISK_INCREMENT );
return STATUS_SUCCESS;
}
TimerStart(Dbg);
DebugTrace(+1, Dbg, "FatFsdCreate\n", 0);
//
// Call the common create routine, with block allowed if the operation
// is synchronous.
//
FsRtlEnterFileSystem();
TopLevel = FatIsIrpTopLevel( Irp );
try {
IrpContext = FatCreateIrpContext( Irp, TRUE );
Status = FatCommonCreate( IrpContext, Irp );
} except(FatExceptionFilter( IrpContext, GetExceptionInformation() )) {
//
// We had some trouble trying to perform the requested
// operation, so we'll abort the I/O request with
// the error status that we get back from the
// execption code
//
Status = FatProcessException( IrpContext, Irp, GetExceptionCode() );
}
if (TopLevel) { IoSetTopLevelIrp( NULL ); }
FsRtlExitFileSystem();
//
// And return to our caller
//
DebugTrace(-1, Dbg, "FatFsdCreate -> %08lx\n", Status );
TimerStop(Dbg,"FatFsdCreate");
UNREFERENCED_PARAMETER( VolumeDeviceObject );
return Status;
}
NTSTATUS
FatCommonCreate (
IN PIRP_CONTEXT IrpContext,
IN PIRP Irp
)
/*++
Routine Description:
This is the common routine for creating/opening a file called by
both the fsd and fsp threads.
Arguments:
Irp - Supplies the Irp to process
Return Value:
NTSTATUS - the return status for the operation
--*/
{
NTSTATUS Status;
IO_STATUS_BLOCK Iosb;
PIO_STACK_LOCATION IrpSp;
PFILE_OBJECT FileObject;
PFILE_OBJECT RelatedFileObject;
UNICODE_STRING FileName;
ULONG AllocationSize;
PFILE_FULL_EA_INFORMATION EaBuffer;
ACCESS_MASK DesiredAccess;
ULONG Options;
UCHAR FileAttributes;
USHORT ShareAccess;
ULONG EaLength;
BOOLEAN CreateDirectory;
BOOLEAN SequentialOnly;
BOOLEAN NoIntermediateBuffering;
BOOLEAN OpenDirectory;
BOOLEAN IsPagingFile;
BOOLEAN OpenTargetDirectory;
BOOLEAN DirectoryFile;
BOOLEAN NonDirectoryFile;
BOOLEAN NoEaKnowledge;
BOOLEAN DeleteOnClose;
BOOLEAN TemporaryFile;
BOOLEAN FileNameOpenedDos;
ULONG CreateDisposition;
PVCB Vcb;
PFCB Fcb;
PCCB Ccb;
PDCB ParentDcb;
PDCB FinalDcb = NULL;
UNICODE_STRING FinalName;
UNICODE_STRING RemainingPart;
UNICODE_STRING NextRemainingPart;
UNICODE_STRING UpcasedFinalName;
WCHAR UpcasedBuffer[MAX_LFN_CHARACTERS];
OEM_STRING OemFinalName;
UCHAR OemBuffer[MAX_LFN_CHARACTERS*2];
PDIRENT Dirent;
PBCB DirentBcb;
ULONG LfnByteOffset;
ULONG DirentByteOffset;
BOOLEAN PostIrp = FALSE;
BOOLEAN OplockPostIrp = FALSE;
BOOLEAN TrailingBackslash;
BOOLEAN FirstLoop = TRUE;
CCB LocalCcb;
UNICODE_STRING Lfn;
WCHAR LfnBuffer[MAX_LFN_CHARACTERS];
//
// Get the current IRP stack location
//
IrpSp = IoGetCurrentIrpStackLocation( Irp );
DebugTrace(+1, Dbg, "FatCommonCreate\n", 0 );
DebugTrace( 0, Dbg, "Irp = %08lx\n", Irp );
DebugTrace( 0, Dbg, "->Flags = %08lx\n", Irp->Flags );
DebugTrace( 0, Dbg, "->FileObject = %08lx\n", IrpSp->FileObject );
DebugTrace( 0, Dbg, " ->RelatedFileObject = %08lx\n", IrpSp->FileObject->RelatedFileObject );
DebugTrace( 0, Dbg, " ->FileName = %Z\n", &IrpSp->FileObject->FileName );
DebugTrace( 0, Dbg, "->AllocationSize.LowPart = %08lx\n", Irp->Overlay.AllocationSize.LowPart );
DebugTrace( 0, Dbg, "->AllocationSize.HighPart = %08lx\n", Irp->Overlay.AllocationSize.HighPart );
DebugTrace( 0, Dbg, "->SystemBuffer = %08lx\n", Irp->AssociatedIrp.SystemBuffer );
DebugTrace( 0, Dbg, "->DesiredAccess = %08lx\n", IrpSp->Parameters.Create.SecurityContext->DesiredAccess );
DebugTrace( 0, Dbg, "->Options = %08lx\n", IrpSp->Parameters.Create.Options );
DebugTrace( 0, Dbg, "->FileAttributes = %04x\n", IrpSp->Parameters.Create.FileAttributes );
DebugTrace( 0, Dbg, "->ShareAccess = %04x\n", IrpSp->Parameters.Create.ShareAccess );
DebugTrace( 0, Dbg, "->EaLength = %08lx\n", IrpSp->Parameters.Create.EaLength );
//
// Here is the "M A R K L U C O V S K Y" hack from hell.
//
// It's here because Mark says he can't avoid sending me double beginning
// backslashes via the Win32 layer.
//
if ((IrpSp->FileObject->FileName.Length > sizeof(WCHAR)) &&
(IrpSp->FileObject->FileName.Buffer[1] == L'\\') &&
(IrpSp->FileObject->FileName.Buffer[0] == L'\\')) {
IrpSp->FileObject->FileName.Length -= sizeof(WCHAR);
RtlMoveMemory( &IrpSp->FileObject->FileName.Buffer[0],
&IrpSp->FileObject->FileName.Buffer[1],
IrpSp->FileObject->FileName.Length );
//
// If there are still two beginning backslashes, the name is bogus.
//
if ((IrpSp->FileObject->FileName.Length > sizeof(WCHAR)) &&
(IrpSp->FileObject->FileName.Buffer[1] == L'\\') &&
(IrpSp->FileObject->FileName.Buffer[0] == L'\\')) {
FatCompleteRequest( IrpContext, Irp, STATUS_OBJECT_NAME_INVALID );
DebugTrace(-1, Dbg, "FatCommonCreate -> STATUS_OBJECT_NAME_INVALID\n", 0);
return STATUS_OBJECT_NAME_INVALID;
}
}
//
// Make sure the input large integer is valid
//
if (Irp->Overlay.AllocationSize.HighPart != 0) {
FatCompleteRequest( IrpContext, Irp, STATUS_INVALID_PARAMETER );
DebugTrace(-1, Dbg, "FatCommonCreate -> STATUS_INVALID_PARAMETER\n", 0);
return STATUS_INVALID_PARAMETER;
}
//
// Reference our input parameters to make things easier
//
FileObject = IrpSp->FileObject;
FileName = FileObject->FileName;
RelatedFileObject = FileObject->RelatedFileObject;
AllocationSize = Irp->Overlay.AllocationSize.LowPart;
EaBuffer = Irp->AssociatedIrp.SystemBuffer;
DesiredAccess = IrpSp->Parameters.Create.SecurityContext->DesiredAccess;
Options = IrpSp->Parameters.Create.Options;
FileAttributes = (UCHAR)(IrpSp->Parameters.Create.FileAttributes & ~FILE_ATTRIBUTE_NORMAL);
ShareAccess = IrpSp->Parameters.Create.ShareAccess;
EaLength = IrpSp->Parameters.Create.EaLength;
//
// Set up the file object's Vpb pointer in case anything happens.
// This will allow us to get a reasonable pop-up.
//
if ( RelatedFileObject != NULL ) {
FileObject->Vpb = RelatedFileObject->Vpb;
}
//
// If we have Write Through set in the FileObject, then set the FileObject
// flag as well, so that the fast write path call to FsRtlCopyWrite
// knows it is Write Through.
//
if (FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH)) {
FileObject->Flags |= FO_WRITE_THROUGH;
}
//
// Force setting the archive bit in the attributes byte to follow OS/2,
// & DOS semantics. Also mask out any extraneous bits, note that
// we can't use the ATTRIBUTE_VALID_FLAGS constant because that has
// the control and normal flags set.
//
// Delay setting ARCHIVE in case this is a directory: DavidGoe 2/16/95
//
FileAttributes &= (FILE_ATTRIBUTE_READONLY |
FILE_ATTRIBUTE_HIDDEN |
FILE_ATTRIBUTE_SYSTEM |
FILE_ATTRIBUTE_ARCHIVE );
//
// Locate the volume device object and Vcb that we are trying to access
//
Vcb = &((PVOLUME_DEVICE_OBJECT)IrpSp->DeviceObject)->Vcb;
//
// If this is a double space volume, turn off the FILE_WRITE_DATA bit
// if set.
//
#if defined(WE_WON_ON_APPEAL) && !defined(DOUBLE_SPACE_WRITE)
if ((Vcb->Dscb != NULL) &&
FlagOn(DesiredAccess, FILE_ADD_FILE |
FILE_ADD_SUBDIRECTORY |
FILE_DELETE_CHILD |
FILE_WRITE_DATA |
FILE_APPEND_DATA |
FILE_WRITE_EA |
FILE_WRITE_ATTRIBUTES |
DELETE )) {
FatCompleteRequest( IrpContext, Irp, STATUS_ACCESS_DENIED );
DebugTrace(-1, Dbg, "FatCommonCreate -> STATUS_ACCESS_DENIED\n", 0);
return STATUS_ACCESS_DENIED;
}
#endif
//
// Verify that this isn't an open for a structured storage type.
//
if ((Options & FILE_STORAGE_TYPE_SPECIFIED) == FILE_STORAGE_TYPE_SPECIFIED) {
ClearFlag(Options, FILE_STORAGE_TYPE_SPECIFIED);
if ((Options & FILE_STORAGE_TYPE_FILE) == FILE_STORAGE_TYPE_FILE) {
//
// Treated as FILE_NON_DIRECTORY_FILE.
//
ClearFlag(Options, FILE_STORAGE_TYPE_FILE);
SetFlag(Options, FILE_NON_DIRECTORY_FILE);
} else if ((Options & FILE_STORAGE_TYPE_DIRECTORY) == FILE_STORAGE_TYPE_DIRECTORY) {
//
// Treated as FILE_DIRECTORY_FILE.
//
ClearFlag(Options, FILE_STORAGE_TYPE_DIRECTORY);
SetFlag(Options, FILE_DIRECTORY_FILE);
} else if ((Options & FILE_STORAGE_TYPE_DEFAULT) == FILE_STORAGE_TYPE_DEFAULT) {
//
// Treated as neither FILE nor NON_DIRECTORY_FILE.
//
ClearFlag(Options, FILE_STORAGE_TYPE_DEFAULT);
}
if ((Options & FILE_STORAGE_TYPE_MASK) != 0) {
FatCompleteRequest( IrpContext, Irp, STATUS_INVALID_PARAMETER );
DebugTrace(-1, Dbg, "FatCommonCreate -> STATUS_INVALID_PARAMETER\n", 0);
return STATUS_INVALID_PARAMETER;
}
}
//
// Decipher Option flags and values
//
DirectoryFile = BooleanFlagOn( Options, FILE_DIRECTORY_FILE );
NonDirectoryFile = BooleanFlagOn( Options, FILE_NON_DIRECTORY_FILE );
SequentialOnly = BooleanFlagOn( Options, FILE_SEQUENTIAL_ONLY );
NoIntermediateBuffering = BooleanFlagOn( Options, FILE_NO_INTERMEDIATE_BUFFERING );
NoEaKnowledge = BooleanFlagOn( Options, FILE_NO_EA_KNOWLEDGE );
DeleteOnClose = BooleanFlagOn( Options, FILE_DELETE_ON_CLOSE );
TemporaryFile = BooleanFlagOn( IrpSp->Parameters.Create.FileAttributes,
FILE_ATTRIBUTE_TEMPORARY );
CreateDisposition = (Options >> 24) & 0x000000ff;
IsPagingFile = BooleanFlagOn( IrpSp->Flags, SL_OPEN_PAGING_FILE );
OpenTargetDirectory = BooleanFlagOn( IrpSp->Flags, SL_OPEN_TARGET_DIRECTORY );
CreateDirectory = (BOOLEAN)(DirectoryFile &&
((CreateDisposition == FILE_CREATE) ||
(CreateDisposition == FILE_OPEN_IF)));
OpenDirectory = (BOOLEAN)(DirectoryFile &&
((CreateDisposition == FILE_OPEN) ||
(CreateDisposition == FILE_OPEN_IF)));
//
// Acquire exclusive access to the vcb, and enqueue the Irp if
// we didn't get it.
//
if (!FatAcquireExclusiveVcb( IrpContext, Vcb )) {
DebugTrace(0, Dbg, "Cannot acquire Vcb\n", 0);
Iosb.Status = FatFsdPostRequest( IrpContext, Irp );
DebugTrace(-1, Dbg, "FatCommonCreate -> %08lx\n", Iosb.Status );
return Iosb.Status;
}
//
// Initialize the DirentBcb to null
//
DirentBcb = NULL;
try {
//
// Make sure the vcb is in a usable condition. This will raise
// and error condition if the volume is unusable
//
FatVerifyVcb( IrpContext, Vcb );
//
// If the Vcb is locked then we cannot open another file
//
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_LOCKED)) {
DebugTrace(0, Dbg, "Volume is locked\n", 0);
try_return( Iosb.Status = STATUS_ACCESS_DENIED );
}
//
// Check if we are opening the volume and not a file/directory.
// We are opening the volume if the name is empty and there
// isn't a related file object. If there is a related file object
// then it is the Vcb itself.
//
if ((FileName.Length == 0) &&
((RelatedFileObject == NULL) ||
(FatDecodeFileObject(RelatedFileObject,&Vcb,&Fcb,&Ccb)) == UserVolumeOpen)) {
//
// Check if we were to open a directory
//
if (DirectoryFile) {
DebugTrace(0, Dbg, "Cannot open volume as a directory\n", 0);
try_return( Iosb.Status = STATUS_NOT_A_DIRECTORY );
}
//
// Can't open the TargetDirectory of the DASD volume.
//
if (OpenTargetDirectory) {
try_return( Iosb.Status = STATUS_INVALID_PARAMETER );
}
DebugTrace(0, Dbg, "Opening the volume, Vcb = %08lx\n", Vcb);
CollectCreateHitStatistics(Vcb);
Iosb = FatOpenVolume( IrpContext,
FileObject,
Vcb,
DesiredAccess,
ShareAccess,
CreateDisposition );
Irp->IoStatus.Information = Iosb.Information;
try_return( Iosb.Status );
}
//
// Check if we're opening the root dcb
//
if ((FileName.Length == sizeof(WCHAR)) &&
(FileName.Buffer[0] == L'\\')) {
//
// Check if we were not suppose to open a directory
//
if (NonDirectoryFile) {
DebugTrace(0, Dbg, "Cannot open root directory as a file\n", 0);
try_return( Iosb.Status = STATUS_FILE_IS_A_DIRECTORY );
}
//
// Can't open the TargetDirectory of the root directory.
//
if (OpenTargetDirectory) {
try_return( Iosb.Status = STATUS_INVALID_PARAMETER );
}
//
// Not allowed to delete root directory.
//
if (DeleteOnClose) {
try_return( Iosb.Status = STATUS_CANNOT_DELETE );
}
DebugTrace(0, Dbg, "Opening root dcb\n", 0);
CollectCreateHitStatistics(Vcb);
Iosb = FatOpenRootDcb( IrpContext,
FileObject,
Vcb,
DesiredAccess,
ShareAccess,
CreateDisposition );
Irp->IoStatus.Information = Iosb.Information;
try_return( Iosb.Status );
}
//
// FatCommonCreate(): trailing backslash check
//
if ((FileName.Length != 0) &&
(FileName.Buffer[FileName.Length/sizeof(WCHAR)-1] == L'\\')) {
FileName.Length -= sizeof(WCHAR);
TrailingBackslash = TRUE;
} else {
TrailingBackslash = FALSE;
}
//
// If there is a related file object then this is a relative open.
// The related file object is the directory to start our search at.
// Return an error if it is not a directory.
//
if (RelatedFileObject != NULL) {
PVCB RelatedVcb;
PDCB RelatedDcb;
PCCB RelatedCcb;
TYPE_OF_OPEN TypeOfOpen;
TypeOfOpen = FatDecodeFileObject( RelatedFileObject,
&RelatedVcb,
&RelatedDcb,
&RelatedCcb );
if (TypeOfOpen != UserFileOpen &&
TypeOfOpen != UserDirectoryOpen) {
DebugTrace(0, Dbg, "Invalid related file object\n", 0);
try_return( Iosb.Status = STATUS_OBJECT_PATH_NOT_FOUND );
}
//
// Check a special error case.
//
if ((FileName.Length == sizeof(WCHAR)) &&
(FileName.Buffer[0] == L'\\')) {
try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
}
//
// Set up the file object's Vpb pointer in case anything happens.
//
FileObject->Vpb = RelatedFileObject->Vpb;
ParentDcb = RelatedDcb;
} else {
ParentDcb = Vcb->RootDcb;
}
//
// Initialize our two temp strings with their stack buffers.
//
OemFinalName.Length = 0;
OemFinalName.MaximumLength = MAX_LFN_CHARACTERS * 2;
OemFinalName.Buffer = OemBuffer;
UpcasedFinalName.Length = 0;
UpcasedFinalName.MaximumLength = MAX_LFN_CHARACTERS * sizeof(WCHAR);
UpcasedFinalName.Buffer = UpcasedBuffer;
//
// We loop here until we land on an Fcb that is in a good
// condition. This way we can reopen files that have stale handles
// to files of the same name but are now different.
//
while ( TRUE ) {
Fcb = ParentDcb;
RemainingPart = FileName;
//
// Now walk down the Dcb tree looking for the longest prefix.
// This one exit condition in the while() is to handle a
// special case condition (relative NULL name open), the main
// exit conditions are at the bottom of the loop.
//
while (RemainingPart.Length != 0) {
PFCB NextFcb;
FsRtlDissectName( RemainingPart,
&FinalName,
&NextRemainingPart );
//
// If RemainingPart starts with a backslash the name is
// invalid.
// Check for no more than 255 characters in FinalName
//
if (((NextRemainingPart.Length != 0) && (NextRemainingPart.Buffer[0] == L'\\')) ||
(FinalName.Length > 255*sizeof(WCHAR))) {
try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
}
//
// Now, try to convert this one component into Oem and search
// the splay tree. If it works then that's great, otherwise
// we have to try with the UNICODE name instead.
//
Status = FatUpcaseUnicodeStringToCountedOemString( &OemFinalName, &FinalName, FALSE );
if (NT_SUCCESS(Status)) {
NextFcb = FatFindFcb( IrpContext,
&Fcb->Specific.Dcb.RootOemNode,
(PSTRING)&OemFinalName,
&FileNameOpenedDos );
} else {
NextFcb = NULL;
OemFinalName.Length = 0;
if (Status != STATUS_UNMAPPABLE_CHARACTER) {
try_return( Iosb.Status = Status );
}
}
//
// If we didn't find anything searching the Oem space, we
// have to try the Unicode space. To save cycles in the
// common case that this tree is empty, we do a quick check
// here.
//
if ((NextFcb == NULL) && Fcb->Specific.Dcb.RootUnicodeNode) {
//
// First downcase, then upcase the string, because this
// is what happens when putting names into the tree (see
// strucsup.c, FatConstructNamesInFcb()).
//
Status = FatDowncaseUnicodeString(&UpcasedFinalName, &FinalName, FALSE );
if (!NT_SUCCESS(Status)) {
try_return( Iosb.Status = Status );
}
Status = FatUpcaseUnicodeString( &UpcasedFinalName, &UpcasedFinalName, FALSE );
if (!NT_SUCCESS(Status)) {
try_return( Iosb.Status = Status );
}
NextFcb = FatFindFcb( IrpContext,
&Fcb->Specific.Dcb.RootUnicodeNode,
(PSTRING)&UpcasedFinalName,
&FileNameOpenedDos );
}
//
// If we got back an Fcb then we consumed the FinalName
// legitimately, so the remaining name is now RemainingPart.
//
if (NextFcb != NULL) {
Fcb = NextFcb;
RemainingPart = NextRemainingPart;
}
if ((NextFcb == NULL) ||
(NodeType(NextFcb) == FAT_NTC_FCB) ||
(NextRemainingPart.Length == 0)) {
break;
}
}
//
// Remaining name cannot start with a backslash
//
if (RemainingPart.Length && (RemainingPart.Buffer[0] == L'\\')) {
RemainingPart.Length -= sizeof(WCHAR);
RemainingPart.Buffer += 1;
}
//
// Now verify that everybody up to the longest found prefix is valid.
//
try {
FatVerifyFcb( IrpContext, Fcb );
} except( (GetExceptionCode() == STATUS_FILE_INVALID) ?
EXCEPTION_EXECUTE_HANDLER :
EXCEPTION_CONTINUE_SEARCH ) {
NOTHING;
}
if ( Fcb->FcbCondition == FcbGood ) {
//
// If we are trying to open a paging file and have happened
// upon the DelayedCloseFcb, make it go away, and try again.
//
if (IsPagingFile && FirstLoop &&
(NodeType(Fcb) == FAT_NTC_FCB) &&
(!IsListEmpty( &FatData.AsyncCloseList ) ||
!IsListEmpty( &FatData.DelayedCloseList ))) {
FatFspClose(Vcb);
FirstLoop = FALSE;
continue;
} else {
break;
}
} else {
FatRemoveNames( IrpContext, Fcb );
}
}
//
// If there is already an Fcb for a paging file open, we cannot
// continue as it is too difficult to move a live Fcb to
// non-paged pool.
//
if (IsPagingFile && (NodeType(Fcb) == FAT_NTC_FCB)) {
try_return( Iosb.Status = STATUS_SHARING_VIOLATION );
}
//
// If the longest prefix is pending delete (either the file or
// some higher level directory), we cannot continue.
//
if (FlagOn( Fcb->FcbState, FCB_STATE_DELETE_ON_CLOSE )) {
try_return( Iosb.Status = STATUS_DELETE_PENDING );
}
//
// Check for a system file.
//
if (FlagOn( Fcb->FcbState, FCB_STATE_SYSTEM_FILE )) {
try_return( Iosb.Status = STATUS_ACCESS_DENIED );
}
//
// Now that we've found the longest matching prefix we'll
// check if there isn't any remaining part because that means
// we've located an existing fcb/dcb to open and we can do the open
// without going to the disk
//
if (RemainingPart.Length == 0) {
//
// First check if the user wanted to open the target directory
// and if so then call the subroutine to finish the open.
//
if (OpenTargetDirectory) {
CollectCreateHitStatistics(Vcb);
Iosb = FatOpenTargetDirectory( IrpContext,
FileObject,
Fcb->ParentDcb,
DesiredAccess,
ShareAccess,
TRUE );
Irp->IoStatus.Information = Iosb.Information;
try_return( Iosb.Status );
}
//
// We can open an existing fcb/dcb, now we only need to case
// on which type to open.
//
if (NodeType(Fcb) == FAT_NTC_DCB || NodeType(Fcb) == FAT_NTC_ROOT_DCB) {
//
// This is a directory we're opening up so check if
// we were not to open a directory
//
if (NonDirectoryFile) {
DebugTrace(0, Dbg, "Cannot open directory as a file\n", 0);
try_return( Iosb.Status = STATUS_FILE_IS_A_DIRECTORY );
}
DebugTrace(0, Dbg, "Open existing dcb, Dcb = %08lx\n", Fcb);
CollectCreateHitStatistics(Vcb);
Iosb = FatOpenExistingDcb( IrpContext,
FileObject,
Vcb,
(PDCB)Fcb,
DesiredAccess,
ShareAccess,
CreateDisposition,
NoEaKnowledge,
DeleteOnClose );
Irp->IoStatus.Information = Iosb.Information;
try_return( Iosb.Status );
}
//
// Check if we're trying to open an existing Fcb and that
// the user didn't want to open a directory. Note that this
// call might actually come back with status_pending because
// the user wanted to supersede or overwrite the file and we
// cannot block. If it is pending then we do not complete the
// request, and we fall through the bottom to the code that
// dispatches the request to the fsp.
//
if (NodeType(Fcb) == FAT_NTC_FCB) {
//
// Check if we were only to open a directory
//
if (OpenDirectory) {
DebugTrace(0, Dbg, "Cannot open file as directory\n", 0);
try_return( Iosb.Status = STATUS_NOT_A_DIRECTORY );
}
DebugTrace(0, Dbg, "Open existing fcb, Fcb = %08lx\n", Fcb);
if ( TrailingBackslash ) {
try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
}
CollectCreateHitStatistics(Vcb);
Iosb = FatOpenExistingFcb( IrpContext,
FileObject,
Vcb,
Fcb,
DesiredAccess,
ShareAccess,
AllocationSize,
EaBuffer,
EaLength,
FileAttributes,
CreateDisposition,
NoEaKnowledge,
DeleteOnClose,
FileNameOpenedDos,
&OplockPostIrp );
if (Iosb.Status != STATUS_PENDING) {
//
// Check if we need to set the cache support flag in
// the file object
//
if (NT_SUCCESS( Iosb.Status) && !NoIntermediateBuffering) {
FileObject->Flags |= FO_CACHE_SUPPORTED;
}
Irp->IoStatus.Information = Iosb.Information;
} else {
DebugTrace(0, Dbg, "Enqueue Irp to FSP\n", 0);
PostIrp = TRUE;
}
try_return( Iosb.Status );
}
//
// Not and Fcb or a Dcb so we bug check
//
FatBugCheck( NodeType(Fcb), 0, 0 );
}
//
// There is more in the name to parse than we have in existing
// fcbs/dcbs. So now make sure that fcb we got for the largest
// matching prefix is really a dcb otherwise we can't go any
// further
//
if ((NodeType(Fcb) != FAT_NTC_DCB) && (NodeType(Fcb) != FAT_NTC_ROOT_DCB)) {
DebugTrace(0, Dbg, "Cannot open file as subdirectory, Fcb = %08lx\n", Fcb);
try_return( Iosb.Status = STATUS_OBJECT_PATH_NOT_FOUND );
}
//
// Otherwise we continue on processing the Irp and allowing ourselves
// to block for I/O as necessary. Find/create additional dcb's for
// the one we're trying to open. We loop until either remaining part
// is empty or we get a bad filename. When we exit FinalName is
// the last name in the string we're after, and ParentDcb is the
// parent directory that will contain the opened/created
// file/directory.
//
// Make sure the rest of the name is valid in at least the LFN
// character set (which just happens to be that of HPFS).
//
// If we are not in ChicagoMode, use FAT symantics.
//
ParentDcb = Fcb;
FirstLoop = TRUE;
while (TRUE) {
//
// We do one little optimization here on the first itterration of
// the loop since we know that we have already tried to convert
// FinalOemName from the original UNICODE.
//
if (FirstLoop) {
FirstLoop = FALSE;
RemainingPart = NextRemainingPart;
Status = OemFinalName.Length ? STATUS_SUCCESS : STATUS_UNMAPPABLE_CHARACTER;
} else {
//
// Dissect the remaining part.
//
DebugTrace(0, Dbg, "Dissecting the name %Z\n", &RemainingPart);
FsRtlDissectName( RemainingPart,
&FinalName,
&RemainingPart );
//
// If RemainingPart starts with a backslash the name is
// invalid.
// Check for no more than 255 characters in FinalName
//
if (((RemainingPart.Length != 0) && (RemainingPart.Buffer[0] == L'\\')) ||
(FinalName.Length > 255*sizeof(WCHAR))) {
try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
}
//
// Now, try to convert this one component into Oem. If it works
// then that's great, otherwise we have to try with the UNICODE
// name instead.
//
Status = FatUpcaseUnicodeStringToCountedOemString( &OemFinalName, &FinalName, FALSE );
}
if (NT_SUCCESS(Status)) {
//
// We'll start by trying to locate the dirent for the name. Note
// that we already know that there isn't an Fcb/Dcb for the file
// otherwise we would have found it when we did our prefix lookup.
//
if (FatIsNameValid( IrpContext, OemFinalName, FALSE, FALSE, FALSE )) {
FatStringTo8dot3( IrpContext,
OemFinalName,
&LocalCcb.OemQueryTemplate.Constant );
LocalCcb.Flags = 0;
} else {
LocalCcb.Flags = CCB_FLAG_SKIP_SHORT_NAME_COMPARE;
}
} else {
LocalCcb.Flags = CCB_FLAG_SKIP_SHORT_NAME_COMPARE;
if (Status != STATUS_UNMAPPABLE_CHARACTER) {
try_return( Iosb.Status = Status );
}
}
//
// Now we know a lot about the final name, so do legal name
// checking here.
//
if (FatData.ChicagoMode) {
ULONG i;
for (i=0; i < FinalName.Length/sizeof(WCHAR); i++) {
if ((FinalName.Buffer[i] < 0x80) &&
!(FsRtlIsAnsiCharacterLegalHpfs(FinalName.Buffer[i], FALSE))) {
try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
}
}
} else {
if (FlagOn(LocalCcb.Flags, CCB_FLAG_SKIP_SHORT_NAME_COMPARE)) {
try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
}
}
DebugTrace(0, Dbg, "FinalName is %Z\n", &FinalName);
DebugTrace(0, Dbg, "RemainingPart is %Z\n", &RemainingPart);
if (!NT_SUCCESS(Status = FatUpcaseUnicodeString( &UpcasedFinalName, &FinalName, FALSE))) {
try_return( Iosb.Status = Status );
}
LocalCcb.UnicodeQueryTemplate = UpcasedFinalName;
LocalCcb.ContainsWildCards = FALSE;
Lfn.Length = 0;
Lfn.MaximumLength = MAX_LFN_CHARACTERS * sizeof(WCHAR);
Lfn.Buffer = LfnBuffer;
FatLocateDirent( IrpContext,
ParentDcb,
&LocalCcb,
0,
&Dirent,
&DirentBcb,
&DirentByteOffset,
&FileNameOpenedDos,
&Lfn );
//
// Remember we read this Dcb for error recovery.
//
FinalDcb = ParentDcb;
//
// If the remaining part is now empty then this is the last name
// in the string and the one we want to open
//
if (RemainingPart.Length == 0) { break; }
//
// We didn't find a dirent, bail.
//
if (Dirent == NULL) {
Iosb.Status = STATUS_OBJECT_PATH_NOT_FOUND;
try_return( Iosb.Status );
}
//
// We now have a dirent, make sure it is a directory
//
if (!FlagOn( Dirent->Attributes, FAT_DIRENT_ATTR_DIRECTORY )) {
Iosb.Status = STATUS_OBJECT_PATH_NOT_FOUND;
try_return( Iosb.Status );
}
//
// Compute the LfnByteOffset.
//
LfnByteOffset = DirentByteOffset -
FAT_LFN_DIRENTS_NEEDED(&Lfn) * sizeof(LFN_DIRENT);
//
// Create a dcb for the new directory
//
ParentDcb = FatCreateDcb( IrpContext,
Vcb,
ParentDcb,
LfnByteOffset,
DirentByteOffset,
Dirent,
&Lfn );
//
// Remember we created this Dcb for error recovery.
//
FinalDcb = ParentDcb;
FatSetFullNameInFcb( IrpContext, ParentDcb, &FinalName );
FatUnpinBcb( IrpContext, DirentBcb );
}
if (Dirent != NULL) {
//
// Compute the LfnByteOffset.
//
LfnByteOffset = DirentByteOffset -
FAT_LFN_DIRENTS_NEEDED(&Lfn) * sizeof(LFN_DIRENT);
//
// First check if the user wanted to open the target directory
// and if so then call the subroutine to finish the open.
//
if (OpenTargetDirectory) {
Iosb = FatOpenTargetDirectory( IrpContext,
FileObject,
ParentDcb,
DesiredAccess,
ShareAccess,
TRUE );
Irp->IoStatus.Information = Iosb.Information;
try_return( Iosb.Status );
}
//
// We were able to locate an existing dirent entry, so now
// see if it is a directory that we're trying to open.
//
if (FlagOn( Dirent->Attributes, FAT_DIRENT_ATTR_DIRECTORY )) {
//
// Make sure its okay to open a directory
//
if (NonDirectoryFile) {
DebugTrace(0, Dbg, "Cannot open directory as a file\n", 0);
try_return( Iosb.Status = STATUS_FILE_IS_A_DIRECTORY );
}
DebugTrace(0, Dbg, "Open existing directory\n", 0);
Iosb = FatOpenExistingDirectory( IrpContext,
FileObject,
Vcb,
ParentDcb,
Dirent,
LfnByteOffset,
DirentByteOffset,
&Lfn,
DesiredAccess,
ShareAccess,
CreateDisposition,
NoEaKnowledge,
DeleteOnClose );
Irp->IoStatus.Information = Iosb.Information;
try_return( Iosb.Status );
}
//
// Otherwise we're trying to open and existing file, and we
// need to check if the user only wanted to open a directory.
//
if (OpenDirectory) {
DebugTrace(0, Dbg, "Cannot open file as directory\n", 0);
try_return( Iosb.Status = STATUS_NOT_A_DIRECTORY );
}
DebugTrace(0, Dbg, "Open existing file\n", 0);
if ( TrailingBackslash ) {
try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
}
Iosb = FatOpenExistingFile( IrpContext,
FileObject,
Vcb,
ParentDcb,
Dirent,
LfnByteOffset,
DirentByteOffset,
&Lfn,
DesiredAccess,
ShareAccess,
AllocationSize,
EaBuffer,
EaLength,
FileAttributes,
CreateDisposition,
IsPagingFile,
NoEaKnowledge,
DeleteOnClose,
FileNameOpenedDos );
//
// Check if we need to set the cache support flag in
// the file object
//
if (NT_SUCCESS(Iosb.Status) && !NoIntermediateBuffering) {
FileObject->Flags |= FO_CACHE_SUPPORTED;
}
Irp->IoStatus.Information = Iosb.Information;
try_return( Iosb.Status );
}
//
// We can't locate a dirent so this is a new file.
// Check if the user wanted to open the target directory
// and if so then call the subroutine to finish the open.
//
if (OpenTargetDirectory) {
Iosb = FatOpenTargetDirectory( IrpContext,
FileObject,
ParentDcb,
DesiredAccess,
ShareAccess,
FALSE );
Irp->IoStatus.Information = Iosb.Information;
try_return( Iosb.Status );
}
//
// Now check to see if we wanted to only open an existing file.
// And then case on whether we wanted to create a file or a directory.
//
if ((CreateDisposition == FILE_OPEN) ||
(CreateDisposition == FILE_OVERWRITE)) {
DebugTrace( 0, Dbg, "Cannot open nonexisting file\n", 0);
try_return( Iosb.Status = STATUS_OBJECT_NAME_NOT_FOUND );
}
//
// Skip a few cycles later if we know now that the Oem name is not
// valid 8.3.
//
if (FlagOn(LocalCcb.Flags, CCB_FLAG_SKIP_SHORT_NAME_COMPARE)) {
OemFinalName.Length = 0;
}
if (CreateDirectory) {
PACCESS_STATE AccessState;
DebugTrace(0, Dbg, "Create new directory\n", 0);
//
// We check if the caller wants ACCESS_SYSTEM_SECURITY access on this
// directory and fail the request if he does.
//
AccessState = IrpSp->Parameters.Create.SecurityContext->AccessState;
//
// Check if the remaining privilege includes ACCESS_SYSTEM_SECURITY.
//
if (FlagOn( AccessState->RemainingDesiredAccess, ACCESS_SYSTEM_SECURITY )) {
if (!SeSinglePrivilegeCheck( FatSecurityPrivilege,
UserMode )) {
try_return( Iosb.Status = STATUS_ACCESS_DENIED );
}
//
// Move this privilege from the Remaining access to Granted access.
//
ClearFlag( AccessState->RemainingDesiredAccess, ACCESS_SYSTEM_SECURITY );
SetFlag( AccessState->PreviouslyGrantedAccess, ACCESS_SYSTEM_SECURITY );
}
#if defined(WE_WON_ON_APPEAL) && !defined(DOUBLE_SPACE_WRITE)
//
// Check for a double space volume
//
if (Vcb->Dscb != NULL) {
try_return( Iosb.Status = STATUS_ACCESS_DENIED );
}
#endif
//
// If this media is write protected, don't even try the create.
//
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED)) {
//
// Set the real device for the pop-up info, and set the verify
// bit in the device object, so that we will force a verify
// in case the user put the correct media back in.
//
IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
Vcb->Vpb->RealDevice );
SetFlag(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
FatRaiseStatus( IrpContext, STATUS_MEDIA_WRITE_PROTECTED );
}
//
// Don't allow people to create directories with the
// temporary bit set.
//
if (TemporaryFile) {
try_return( Iosb.Status = STATUS_INVALID_PARAMETER );
}
Iosb = FatCreateNewDirectory( IrpContext,
FileObject,
Vcb,
ParentDcb,
&OemFinalName,
&FinalName,
DesiredAccess,
ShareAccess,
EaBuffer,
EaLength,
FileAttributes,
NoEaKnowledge,
DeleteOnClose );
Irp->IoStatus.Information = Iosb.Information;
try_return( Iosb.Status );
}
DebugTrace(0, Dbg, "Create new file\n", 0);
if ( TrailingBackslash ) {
try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
}
{
PACCESS_STATE AccessState;
//
// We check if the caller wants ACCESS_SYSTEM_SECURITY access on this
// directory and fail the request if he does.
//
AccessState = IrpSp->Parameters.Create.SecurityContext->AccessState;
//
// Check if the remaining privilege includes ACCESS_SYSTEM_SECURITY.
//
if (FlagOn( AccessState->RemainingDesiredAccess, ACCESS_SYSTEM_SECURITY )) {
if (!SeSinglePrivilegeCheck( FatSecurityPrivilege,
UserMode )) {
try_return( Iosb.Status = STATUS_ACCESS_DENIED );
}
//
// Move this privilege from the Remaining access to Granted access.
//
ClearFlag( AccessState->RemainingDesiredAccess, ACCESS_SYSTEM_SECURITY );
SetFlag( AccessState->PreviouslyGrantedAccess, ACCESS_SYSTEM_SECURITY );
}
}
#if defined(WE_WON_ON_APPEAL) && !defined(DOUBLE_SPACE_WRITE)
//
// Check for a double space volume
//
if (Vcb->Dscb != NULL) {
try_return( Iosb.Status = STATUS_ACCESS_DENIED );
}
#endif
//
// If this media is write protected, don't even try the create.
//
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED)) {
//
// Set the real device for the pop-up info, and set the verify
// bit in the device object, so that we will force a verify
// in case the user put the correct media back in.
//
IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
Vcb->Vpb->RealDevice );
SetFlag(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
FatRaiseStatus( IrpContext, STATUS_MEDIA_WRITE_PROTECTED );
}
Iosb = FatCreateNewFile( IrpContext,
FileObject,
Vcb,
ParentDcb,
&OemFinalName,
&FinalName,
DesiredAccess,
ShareAccess,
AllocationSize,
EaBuffer,
EaLength,
FileAttributes,
&Lfn,
IsPagingFile,
NoEaKnowledge,
DeleteOnClose,
TemporaryFile );
//
// Check if we need to set the cache support flag in
// the file object
//
if (NT_SUCCESS(Iosb.Status) && !NoIntermediateBuffering) {
FileObject->Flags |= FO_CACHE_SUPPORTED;
}
Irp->IoStatus.Information = Iosb.Information;
try_exit: NOTHING;
//
// This is a Beta Fix. Do this at a better place later.
//
if (NT_SUCCESS(Iosb.Status) && !OpenTargetDirectory) {
PFCB Fcb;
//
// If there is an Fcb/Dcb, set the long file name.
//
Fcb = FileObject->FsContext;
if (Fcb &&
((NodeType(Fcb) == FAT_NTC_FCB) ||
(NodeType(Fcb) == FAT_NTC_DCB)) &&
(Fcb->FullFileName.Buffer == NULL)) {
FatSetFullNameInFcb( IrpContext, Fcb, &FinalName );
}
}
} finally {
DebugUnwind( FatCommonCreate );
//
// We only unpin the Bcb's when we haven't already posted the
// IrpContext.
//
if (!OplockPostIrp) {
FatUnpinBcb( IrpContext, DirentBcb );
}
//
// If we are in an error path, check for any created subdir Dcbs that
// have to be unwound.
//
if ((AbnormalTermination() || !NT_SUCCESS(Iosb.Status)) &&
(FinalDcb != NULL) &&
IsListEmpty(&FinalDcb->Specific.Dcb.ParentDcbQueue) &&
(FinalDcb->OpenCount == 0) &&
(FinalDcb->Specific.Dcb.DirectoryFile != NULL)) {
PFILE_OBJECT DirectoryFileObject;
ULONG SavedFlags;
//
// Before doing the uninitialize, we have to unpin anything
// that has been repinned, but clear writethrough first.
//
SavedFlags = IrpContext->Flags;
ClearFlag( IrpContext->Flags,
IRP_CONTEXT_FLAG_WRITE_THROUGH | IRP_CONTEXT_FLAG_FLOPPY );
FatUnpinRepinnedBcbs( IrpContext );
DirectoryFileObject = FinalDcb->Specific.Dcb.DirectoryFile;
FinalDcb->Specific.Dcb.DirectoryFile = NULL;
CcUninitializeCacheMap( DirectoryFileObject, NULL, NULL );
ObDereferenceObject( DirectoryFileObject );
IrpContext->Flags = SavedFlags;
}
if (AbnormalTermination()) {
FatReleaseVcb( IrpContext, Vcb );
}
}
//
// The following code is only executed if we are exiting the
// procedure through a normal termination. We complete the request
// and if for any reason that bombs out then we need to unreference
// and possibly delete the fcb and ccb.
//
try {
if (PostIrp) {
//
// If the Irp hasn't already been posted, do it now.
//
if (!OplockPostIrp) {
Iosb.Status = FatFsdPostRequest( IrpContext, Irp );
}
} else {
FatUnpinRepinnedBcbs( IrpContext );
}
} finally {
DebugUnwind( FatCommonCreate-in-FatCompleteRequest );
if (AbnormalTermination()) {
PVCB Vcb;
PFCB Fcb;
PCCB Ccb;
//
// Unwind all of our counts. Note that if a write failed, then
// the volume has been marked for verify, and all volume
// structures will be cleaned up automatically.
//
(VOID) FatDecodeFileObject( FileObject, &Vcb, &Fcb, &Ccb );
Fcb->UncleanCount -= 1;
Fcb->OpenCount -= 1;
Vcb->OpenFileCount -= 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
//
// If we created a new Fcb we must get rid of it at this point.
//
if (Fcb->OpenCount == 0) {
if ( (NodeType( Fcb ) == FAT_NTC_DCB) &&
(Fcb->Specific.Dcb.DirectoryFile != NULL) ) {
FatSetFileObject( Fcb->Specific.Dcb.DirectoryFile,
UnopenedFileObject,
NULL,
NULL );
FatSyncUninitializeCacheMap( IrpContext,
Fcb->Specific.Dcb.DirectoryFile );
ObDereferenceObject( Fcb->Specific.Dcb.DirectoryFile );
Fcb->Specific.Dcb.DirectoryFileOpenCount -= 1;
Fcb->Specific.Dcb.DirectoryFile = NULL;
}
FatDeleteFcb( IrpContext, Fcb );
}
FatDeleteCcb( IrpContext, Ccb );
FatReleaseVcb( IrpContext, Vcb );
} else {
FatReleaseVcb( IrpContext, Vcb );
if ( !PostIrp ) {
//
// If this request is successful and the file was opened
// for FILE_EXECUTE access, then set the FileObject bit.
//
if (FlagOn( IrpSp->Parameters.Create.SecurityContext->DesiredAccess,
FILE_EXECUTE )) {
SetFlag( FileObject->Flags, FO_FILE_FAST_IO_READ );
}
//
// Complete the request.
//
FatCompleteRequest( IrpContext, Irp, Iosb.Status );
//
// Lock volume in drive if we opened a paging file.
//
if (IsPagingFile && NT_SUCCESS(Iosb.Status) &&
FlagOn(Vcb->VcbState, VCB_STATE_FLAG_REMOVABLE_MEDIA)) {
SetFlag(Vcb->VcbState, VCB_STATE_FLAG_BOOT_OR_PAGING_FILE);
FatToggleMediaEjectDisable( IrpContext, Vcb, TRUE );
}
}
}
DebugTrace(-1, Dbg, "FatCommonCreate -> %08lx\n", Iosb.Status);
}
CollectCreateStatistics(Vcb, Iosb.Status);
return Iosb.Status;
}
//
// Internal support routine
//
IO_STATUS_BLOCK
FatOpenVolume (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG CreateDisposition
)
/*++
Routine Description:
This routine opens the specified volume for DASD access
Arguments:
FileObject - Supplies the File object
Vcb - Supplies the Vcb denoting the volume being opened
DesiredAccess - Supplies the desired access of the caller
ShareAccess - Supplies the share access of the caller
CreateDisposition - Supplies the create disposition for this operation
Return Value:
IO_STATUS_BLOCK - Returns the completion status for the operation
--*/
{
IO_STATUS_BLOCK Iosb = {0,0};
//
// The following variables are for abnormal termination
//
BOOLEAN UnwindShareAccess = FALSE;
PCCB UnwindCcb = NULL;
BOOLEAN UnwindCounts = FALSE;
BOOLEAN UnwindVolumeLock = FALSE;
DebugTrace(+1, Dbg, "FatOpenVolume...\n", 0);
try {
//
// Check for proper desired access and rights
//
if ((CreateDisposition != FILE_OPEN) &&
(CreateDisposition != FILE_OPEN_IF)) {
try_return( Iosb.Status = STATUS_ACCESS_DENIED );
}
//
// If the user does not want to share write or delete then we will try
// and take out a lock on the volume.
//
if (!FlagOn(ShareAccess, FILE_SHARE_WRITE) &&
!FlagOn(ShareAccess, FILE_SHARE_DELETE)) {
//
// Do a quick check here for handles on exclusive open.
//
if (!FlagOn(ShareAccess, FILE_SHARE_READ) &&
!FatIsHandleCountZero( IrpContext, Vcb )) {
try_return( Iosb.Status = STATUS_SHARING_VIOLATION );
}
//
// Force Mm to get rid of its referenced file objects.
//
FatFlushFat( IrpContext, Vcb );
FatPurgeReferencedFileObjects( IrpContext, Vcb->RootDcb, TRUE );
//
// If the user also does not want to share read then we check
// if anyone is already using the volume, and if so then we
// deny the access. If the user wants to share read then
// we allow the current opens to stay provided they are only
// readonly opens and deny further opens.
//
if (!FlagOn(ShareAccess, FILE_SHARE_READ)) {
if (Vcb->OpenFileCount != 0) {
try_return( Iosb.Status = STATUS_SHARING_VIOLATION );
}
} else {
if (Vcb->ReadOnlyCount != Vcb->OpenFileCount) {
try_return( Iosb.Status = STATUS_SHARING_VIOLATION );
}
}
//
// Lock the volume
//
Vcb->VcbState |= VCB_STATE_FLAG_LOCKED;
Vcb->FileObjectWithVcbLocked = FileObject;
UnwindVolumeLock = TRUE;
}
//
// If the volume is already opened by someone then we need to check
// the share access
//
if (Vcb->DirectAccessOpenCount > 0) {
if (!NT_SUCCESS(Iosb.Status = IoCheckShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Vcb->ShareAccess,
TRUE ))) {
try_return( Iosb.Status );
}
} else {
IoSetShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Vcb->ShareAccess );
}
UnwindShareAccess = TRUE;
//
// Set up the context and section object pointers, and update
// our reference counts
//
FatSetFileObject( FileObject,
UserVolumeOpen,
Vcb,
UnwindCcb = FatCreateCcb( IrpContext ));
FileObject->SectionObjectPointer = &Vcb->SectionObjectPointers;
Vcb->DirectAccessOpenCount += 1;
Vcb->OpenFileCount += 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
UnwindCounts = TRUE;
FileObject->Flags |= FO_NO_INTERMEDIATE_BUFFERING;
//
// And set our status to success
//
Iosb.Status = STATUS_SUCCESS;
Iosb.Information = FILE_OPENED;
try_exit: NOTHING;
} finally {
DebugUnwind( FatOpenVolume );
//
// If this is an abnormal termination then undo our work
//
if (AbnormalTermination() || !NT_SUCCESS(Iosb.Status)) {
if (UnwindCounts) {
Vcb->DirectAccessOpenCount -= 1;
Vcb->OpenFileCount -= 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
}
if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, UnwindCcb ); }
if (UnwindShareAccess) { IoRemoveShareAccess( FileObject, &Vcb->ShareAccess ); }
if (UnwindVolumeLock) { Vcb->VcbState &= ~VCB_STATE_FLAG_LOCKED; }
}
DebugTrace(-1, Dbg, "FatOpenVolume -> Iosb.Status = %08lx\n", Iosb.Status);
}
return Iosb;
}
//
// Internal support routine
//
IO_STATUS_BLOCK
FatOpenRootDcb (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG CreateDisposition
)
/*++
Routine Description:
This routine opens the root dcb for the volume
Arguments:
FileObject - Supplies the File object
Vcb - Supplies the Vcb denoting the volume whose dcb is being opened.
DesiredAccess - Supplies the desired access of the caller
ShareAccess - Supplies the share access of the caller
CreateDisposition - Supplies the create disposition for this operation
Return Value:
IO_STATUS_BLOCK - Returns the completion status for the operation
Arguments:
--*/
{
PDCB RootDcb;
IO_STATUS_BLOCK Iosb;
//
// The following variables are for abnormal termination
//
BOOLEAN UnwindShareAccess = FALSE;
PCCB UnwindCcb = NULL;
BOOLEAN UnwindCounts = FALSE;
BOOLEAN RootDcbAcquired = FALSE;
DebugTrace(+1, Dbg, "FatOpenRootDcb...\n", 0);
//
// Locate the root dcb
//
RootDcb = Vcb->RootDcb;
//
// Get the Dcb exlcusive. This is important as cleanup does not
// acquire the Vcb.
//
(VOID)FatAcquireExclusiveFcb( IrpContext, RootDcb );
RootDcbAcquired = TRUE;
try {
//
// Check the create disposition and desired access
//
if ((CreateDisposition != FILE_OPEN) &&
(CreateDisposition != FILE_OPEN_IF)) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
//
// If the Root dcb is already opened by someone then we need
// to check the share access
//
if (RootDcb->OpenCount > 0) {
if (!NT_SUCCESS(Iosb.Status = IoCheckShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&RootDcb->ShareAccess,
TRUE ))) {
try_return( Iosb );
}
} else {
IoSetShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&RootDcb->ShareAccess );
}
UnwindShareAccess = TRUE;
//
// Setup the context and section object pointers, and update
// our reference counts
//
FatSetFileObject( FileObject,
UserDirectoryOpen,
RootDcb,
UnwindCcb = FatCreateCcb( IrpContext ));
RootDcb->UncleanCount += 1;
RootDcb->OpenCount += 1;
Vcb->OpenFileCount += 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
UnwindCounts = TRUE;
//
// And set our status to success
//
Iosb.Status = STATUS_SUCCESS;
Iosb.Information = FILE_OPENED;
try_exit: NOTHING;
} finally {
DebugUnwind( FatOpenRootDcb );
//
// If this is an abnormal termination then undo our work
//
if (AbnormalTermination()) {
if (UnwindCounts) {
RootDcb->UncleanCount -= 1;
RootDcb->OpenCount -= 1;
Vcb->OpenFileCount -= 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
}
if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, UnwindCcb ); }
if (UnwindShareAccess) { IoRemoveShareAccess( FileObject, &RootDcb->ShareAccess ); }
}
if (RootDcbAcquired) {
FatReleaseFcb( IrpContext, RootDcb );
}
DebugTrace(-1, Dbg, "FatOpenRootDcb -> Iosb.Status = %08lx\n", Iosb.Status);
}
return Iosb;
}
//
// Internal support routine
//
IO_STATUS_BLOCK
FatOpenExistingDcb (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PDCB Dcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG CreateDisposition,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN DeleteOnClose
)
/*++
Routine Description:
This routine opens the specified existing dcb
Arguments:
FileObject - Supplies the File object
Vcb - Supplies the Vcb denoting the volume containing the dcb
Dcb - Supplies the already existing dcb
DesiredAccess - Supplies the desired access of the caller
ShareAccess - Supplies the share access of the caller
CreateDisposition - Supplies the create disposition for this operation
NoEaKnowledge - This opener doesn't understand Ea's and we fail this
open if the file has NeedEa's.
DeleteOnClose - The caller wants the file gone when the handle is closed
Return Value:
IO_STATUS_BLOCK - Returns the completion status for the operation
--*/
{
IO_STATUS_BLOCK Iosb;
PBCB DirentBcb = NULL;
PDIRENT Dirent;
//
// The following variables are for abnormal termination
//
BOOLEAN UnwindShareAccess = FALSE;
PCCB UnwindCcb = NULL;
BOOLEAN UnwindCounts = FALSE;
BOOLEAN DcbAcquired = FALSE;
DebugTrace(+1, Dbg, "FatOpenExistingDcb...\n", 0);
//
// Get the Dcb exlcusive. This is important as cleanup does not
// acquire the Vcb.
//
(VOID)FatAcquireExclusiveFcb( IrpContext, Dcb );
DcbAcquired = TRUE;
try {
//
// If the caller has no Ea knowledge, we immediately check for
// Need Ea's on the file. We don't need to check for ea's on the
// root directory, because it never has any.
//
if (NoEaKnowledge && NodeType(Dcb) != FAT_NTC_ROOT_DCB) {
ULONG NeedEaCount;
//
// Get the dirent for the file and then check that the need
// ea count is 0.
//
FatGetDirentFromFcbOrDcb( IrpContext,
Dcb,
&Dirent,
&DirentBcb );
FatGetNeedEaCount( IrpContext,
Vcb,
Dirent,
&NeedEaCount );
FatUnpinBcb( IrpContext, DirentBcb );
if (NeedEaCount != 0) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
}
//
// Check the create disposition and desired access
//
if ((CreateDisposition != FILE_OPEN) &&
(CreateDisposition != FILE_OPEN_IF)) {
Iosb.Status = STATUS_OBJECT_NAME_COLLISION;
try_return( Iosb );
}
if (!FatCheckFileAccess( IrpContext,
Dcb->DirentFatFlags,
DesiredAccess)) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
//
// If the dcb is already opened by someone then we need
// to check the share access
//
if (Dcb->OpenCount > 0) {
if (!NT_SUCCESS(Iosb.Status = IoCheckShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Dcb->ShareAccess,
TRUE ))) {
try_return( Iosb );
}
} else {
IoSetShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Dcb->ShareAccess );
}
UnwindShareAccess = TRUE;
//
// Setup the context and section object pointers, and update
// our reference counts
//
FatSetFileObject( FileObject,
UserDirectoryOpen,
Dcb,
UnwindCcb = FatCreateCcb( IrpContext ));
Dcb->UncleanCount += 1;
Dcb->OpenCount += 1;
Vcb->OpenFileCount += 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
UnwindCounts = TRUE;
//
// Mark the delete on close bit if the caller asked for that.
//
{
PCCB Ccb = (PCCB)FileObject->FsContext2;
if (DeleteOnClose) {
SetFlag( Ccb->Flags, CCB_FLAG_DELETE_ON_CLOSE );
}
}
//
// In case this was set, clear it now.
//
ClearFlag(Dcb->FcbState, FCB_STATE_DELAY_CLOSE);
//
// And set our status to success
//
Iosb.Status = STATUS_SUCCESS;
Iosb.Information = FILE_OPENED;
try_exit: NOTHING;
} finally {
DebugUnwind( FatOpenExistingDcb );
//
// Unpin the Dirent Bcb if pinned.
//
FatUnpinBcb( IrpContext, DirentBcb );
//
// If this is an abnormal termination then undo our work
//
if (AbnormalTermination()) {
if (UnwindCounts) {
Dcb->UncleanCount -= 1;
Dcb->OpenCount -= 1;
Vcb->OpenFileCount -= 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
}
if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, UnwindCcb ); }
if (UnwindShareAccess) { IoRemoveShareAccess( FileObject, &Dcb->ShareAccess ); }
}
if (DcbAcquired) {
FatReleaseFcb( IrpContext, Dcb );
}
DebugTrace(-1, Dbg, "FatOpenExistingDcb -> Iosb.Status = %08lx\n", Iosb.Status);
}
return Iosb;
}
//
// Internal support routine
//
IO_STATUS_BLOCK
FatOpenExistingFcb (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PFCB Fcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG AllocationSize,
IN PFILE_FULL_EA_INFORMATION EaBuffer,
IN ULONG EaLength,
IN UCHAR FileAttributes,
IN ULONG CreateDisposition,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN DeleteOnClose,
IN BOOLEAN FileNameOpenedDos,
OUT PBOOLEAN OplockPostIrp
)
/*++
Routine Description:
This routine opens the specified existing fcb
Arguments:
FileObject - Supplies the File object
Vcb - Supplies the Vcb denoting the volume containing the Fcb
Fcb - Supplies the already existing fcb
DesiredAccess - Supplies the desired access of the caller
ShareAccess - Supplies the share access of the caller
AllocationSize - Supplies the initial allocation if the file is being
superseded or overwritten
EaBuffer - Supplies the Ea set if the file is being superseded or
overwritten
EaLength - Supplies the size, in byte, of the EaBuffer
FileAttributes - Supplies file attributes to use if the file is being
superseded or overwritten
CreateDisposition - Supplies the create disposition for this operation
NoEaKnowledge - This opener doesn't understand Ea's and we fail this
open if the file has NeedEa's.
DeleteOnClose - The caller wants the file gone when the handle is closed
FileNameOpenedDos - The caller hit the short side of the name pair finding
this file
OplockPostIrp - Address to store boolean indicating if the Irp needs to
be posted to the Fsp.
Return Value:
IO_STATUS_BLOCK - Returns the completion status for the operation
--*/
{
IO_STATUS_BLOCK Iosb;
PBCB DirentBcb = NULL;
PDIRENT Dirent;
//
// The following variables are for abnormal termination
//
BOOLEAN UnwindShareAccess = FALSE;
PCCB UnwindCcb = NULL;
BOOLEAN UnwindCounts = FALSE;
BOOLEAN DecrementFcbOpenCount = FALSE;
BOOLEAN FcbAcquired = FALSE;
DebugTrace(+1, Dbg, "FatOpenExistingFcb...\n", 0);
//
// Get the Fcb exlcusive. This is important as cleanup does not
// acquire the Vcb.
//
(VOID)FatAcquireExclusiveFcb( IrpContext, Fcb );
FcbAcquired = TRUE;
try {
*OplockPostIrp = FALSE;
//
// Take special action if there is a current batch oplock or
// batch oplock break in process on the Fcb.
//
if (FsRtlCurrentBatchOplock( &Fcb->Specific.Fcb.Oplock )) {
//
// We remember if a batch oplock break is underway for the
// case where the sharing check fails.
//
Iosb.Information = FILE_OPBATCH_BREAK_UNDERWAY;
Iosb.Status = FsRtlCheckOplock( &Fcb->Specific.Fcb.Oplock,
IrpContext->OriginatingIrp,
IrpContext,
FatOplockComplete,
FatPrePostIrp );
if (Iosb.Status != STATUS_SUCCESS
&& Iosb.Status != STATUS_OPLOCK_BREAK_IN_PROGRESS) {
*OplockPostIrp = TRUE;
try_return( NOTHING );
}
}
//
// Check if the user wanted to create the file, also special case
// the supersede and overwrite options. Those add additional
// desired accesses to the caller
//
if (CreateDisposition == FILE_CREATE) {
Iosb.Status = STATUS_OBJECT_NAME_COLLISION;
try_return( Iosb );
} else if (CreateDisposition == FILE_SUPERSEDE) {
DesiredAccess |= DELETE;
} else if ((CreateDisposition == FILE_OVERWRITE) ||
(CreateDisposition == FILE_OVERWRITE_IF)) {
DesiredAccess |= FILE_WRITE_DATA | FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES;
}
//
// Check the desired access
//
if (!FatCheckFileAccess( IrpContext,
Fcb->DirentFatFlags,
DesiredAccess )) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
//
// Check for trying to delete a read only file.
//
if (DeleteOnClose &&
FlagOn( Fcb->DirentFatFlags, FAT_DIRENT_ATTR_READ_ONLY )) {
Iosb.Status = STATUS_CANNOT_DELETE;
try_return( Iosb );
}
//
// If we are asked to do an overwrite or supersede operation then
// deny access for files where the file attributes for system and
// hidden do not match
//
if ((CreateDisposition == FILE_SUPERSEDE) ||
(CreateDisposition == FILE_OVERWRITE) ||
(CreateDisposition == FILE_OVERWRITE_IF)) {
BOOLEAN Hidden;
BOOLEAN System;
Hidden = BooleanFlagOn(Fcb->DirentFatFlags, FAT_DIRENT_ATTR_HIDDEN );
System = BooleanFlagOn(Fcb->DirentFatFlags, FAT_DIRENT_ATTR_SYSTEM );
if ((Hidden && !FlagOn(FileAttributes, FILE_ATTRIBUTE_HIDDEN)) ||
(System && !FlagOn(FileAttributes, FILE_ATTRIBUTE_SYSTEM))) {
DebugTrace(0, Dbg, "The hidden and/or system bits do not match\n", 0);
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
#if defined(WE_WON_ON_APPEAL) && !defined(DOUBLE_SPACE_WRITE)
if (Vcb->Dscb != NULL) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
#endif
//
// If this media is write protected, don't even try the create.
//
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED)) {
//
// Set the real device for the pop-up info, and set the verify
// bit in the device object, so that we will force a verify
// in case the user put the correct media back in.
//
IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
Vcb->Vpb->RealDevice );
SetFlag(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
FatRaiseStatus( IrpContext, STATUS_MEDIA_WRITE_PROTECTED );
}
}
//
// Check if the Fcb has the proper share access
//
if (!NT_SUCCESS(Iosb.Status = IoCheckShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Fcb->ShareAccess,
FALSE ))) {
try_return( Iosb );
}
//
// Now check that we can continue based on the oplock state of the
// file.
//
Iosb.Status = FsRtlCheckOplock( &Fcb->Specific.Fcb.Oplock,
IrpContext->OriginatingIrp,
IrpContext,
FatOplockComplete,
FatPrePostIrp );
if (Iosb.Status != STATUS_SUCCESS
&& Iosb.Status != STATUS_OPLOCK_BREAK_IN_PROGRESS) {
*OplockPostIrp = TRUE;
try_return( NOTHING );
}
//
// Set the flag indicating if Fast I/O is possible
//
Fcb->Header.IsFastIoPossible = FatIsFastIoPossible( Fcb );
//
// If the user wants write access access to the file make sure there
// is not a process mapping this file as an image. Any attempt to
// delete the file will be stopped in fileinfo.c
//
// If the user wants to delete on close, we must check at this
// point though.
//
if ( FlagOn(DesiredAccess, FILE_WRITE_DATA) || DeleteOnClose ) {
Fcb->OpenCount += 1;
DecrementFcbOpenCount = TRUE;
if (!MmFlushImageSection( &Fcb->NonPaged->SectionObjectPointers,
MmFlushForWrite )) {
Iosb.Status = DeleteOnClose ? STATUS_CANNOT_DELETE :
STATUS_SHARING_VIOLATION;
try_return( Iosb );
}
}
//
// If this is a non-cached open, and there are no open cached
// handles, but there is a still a data section, attempt a flush
// and purge operation to avoid cache coherency overhead later.
// We ignore any I/O errors from the flush.
//
// We set the CREATE_IN_PROGRESS flag to prevent the Fcb from
// going away out from underneath us.
//
if (FlagOn(FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING) &&
(Fcb->UncleanCount == Fcb->NonCachedUncleanCount) &&
(Fcb->NonPaged->SectionObjectPointers.DataSectionObject != NULL)) {
SetFlag(Fcb->Vcb->VcbState, VCB_STATE_FLAG_CREATE_IN_PROGRESS);
CcFlushCache( &Fcb->NonPaged->SectionObjectPointers, NULL, 0, NULL );
CcPurgeCacheSection( &Fcb->NonPaged->SectionObjectPointers,
NULL,
0,
FALSE );
ClearFlag(Fcb->Vcb->VcbState, VCB_STATE_FLAG_CREATE_IN_PROGRESS);
}
//
// Check if the user only wanted to open the file
//
if ((CreateDisposition == FILE_OPEN) ||
(CreateDisposition == FILE_OPEN_IF)) {
DebugTrace(0, Dbg, "Doing open operation\n", 0);
//
// If the caller has no Ea knowledge, we immediately check for
// Need Ea's on the file.
//
if (NoEaKnowledge) {
ULONG NeedEaCount;
//
// Get the dirent for the file and then check that the need
// ea count is 0.
//
FatGetDirentFromFcbOrDcb( IrpContext,
Fcb,
&Dirent,
&DirentBcb );
FatGetNeedEaCount( IrpContext,
Vcb,
Dirent,
&NeedEaCount );
FatUnpinBcb( IrpContext, DirentBcb );
if (NeedEaCount != 0) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
}
//
// Everything checks out okay, so setup the context and
// section object pointers.
//
FatSetFileObject( FileObject,
UserFileOpen,
Fcb,
UnwindCcb = FatCreateCcb( IrpContext ));
FileObject->SectionObjectPointer = &Fcb->NonPaged->SectionObjectPointers;
//
// Fill in the information field, the status field is already
// set.
//
Iosb.Information = FILE_OPENED;
try_return( Iosb );
}
//
// Check if we are to supersede/overwrite the file, we can wait for
// any I/O at this point
//
if ((CreateDisposition == FILE_SUPERSEDE) ||
(CreateDisposition == FILE_OVERWRITE) ||
(CreateDisposition == FILE_OVERWRITE_IF)) {
NTSTATUS OldStatus;
PACCESS_STATE AccessState;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( IrpContext->OriginatingIrp );
DebugTrace(0, Dbg, "Doing supersede/overwrite operation\n", 0);
//
// We check if the caller wants ACCESS_SYSTEM_SECURITY access on this
// directory and fail the request if he does.
//
AccessState = IrpSp->Parameters.Create.SecurityContext->AccessState;
//
// Check if the remaining privilege includes ACCESS_SYSTEM_SECURITY.
//
if (FlagOn( AccessState->RemainingDesiredAccess, ACCESS_SYSTEM_SECURITY )) {
if (!SeSinglePrivilegeCheck( FatSecurityPrivilege,
UserMode )) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
//
// Move this privilege from the Remaining access to Granted access.
//
ClearFlag( AccessState->RemainingDesiredAccess, ACCESS_SYSTEM_SECURITY );
SetFlag( AccessState->PreviouslyGrantedAccess, ACCESS_SYSTEM_SECURITY );
}
//
// And overwrite the file. We remember the previous status
// code because it may contain information about
// the oplock status.
//
OldStatus = Iosb.Status;
Iosb = FatSupersedeOrOverwriteFile( IrpContext,
FileObject,
Fcb,
DesiredAccess,
ShareAccess,
AllocationSize,
EaBuffer,
EaLength,
FileAttributes,
CreateDisposition,
NoEaKnowledge );
if (Iosb.Status == STATUS_SUCCESS) {
Iosb.Status = OldStatus;
}
try_return( Iosb );
}
//
// If we ever get here then the I/O system gave us some bad input
//
FatBugCheck( CreateDisposition, 0, 0 );
try_exit: NOTHING;
//
// Update the share access and counts if successful
//
if ((Iosb.Status != STATUS_PENDING) && NT_SUCCESS(Iosb.Status)) {
IoUpdateShareAccess( FileObject, &Fcb->ShareAccess );
UnwindShareAccess = TRUE;
//
// In case this was set, clear it now.
//
ClearFlag(Fcb->FcbState, FCB_STATE_DELAY_CLOSE);
Fcb->UncleanCount += 1;
Fcb->OpenCount += 1;
if (FlagOn(FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING)) {
Fcb->NonCachedUncleanCount += 1;
}
Vcb->OpenFileCount += 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
UnwindCounts = TRUE;
{
PCCB Ccb;
Ccb = (PCCB)FileObject->FsContext2;
//
// Mark the DeleteOnClose bit if the operation was successful.
//
if ( DeleteOnClose ) {
SetFlag( Ccb->Flags, CCB_FLAG_DELETE_ON_CLOSE );
}
//
// Mark the OpenedByShortName bit if the operation was successful.
//
if ( FileNameOpenedDos ) {
SetFlag( Ccb->Flags, CCB_FLAG_OPENED_BY_SHORTNAME );
}
}
}
} finally {
DebugUnwind( FatOpenExistingFcb );
//
// Unpin the Dirent Bcb if pinned.
//
FatUnpinBcb( IrpContext, DirentBcb );
//
// If this is an abnormal termination then undo our work
//
if (AbnormalTermination()) {
if (UnwindCounts) {
Fcb->UncleanCount -= 1;
Fcb->OpenCount -= 1;
if (FlagOn(FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING)) {
Fcb->NonCachedUncleanCount -= 1;
}
Vcb->OpenFileCount -= 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
}
if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, UnwindCcb ); }
if (UnwindShareAccess) { IoRemoveShareAccess( FileObject, &Fcb->ShareAccess ); }
}
if (DecrementFcbOpenCount) {
Fcb->OpenCount -= 1;
if (Fcb->OpenCount == 0) { FatDeleteFcb( IrpContext, Fcb ); }
}
if (FcbAcquired) {
FatReleaseFcb( IrpContext, Fcb );
}
DebugTrace(-1, Dbg, "FatOpenExistingFcb -> Iosb.Status = %08lx\n", Iosb.Status);
}
return Iosb;
}
//
// Internal support routine
//
IO_STATUS_BLOCK
FatOpenTargetDirectory (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PDCB Dcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN BOOLEAN DoesNameExist
)
/*++
Routine Description:
This routine opens the target directory and replaces the name in the
file object with the remaining name.
Arguments:
FileObject - Supplies the File object
Dcb - Supplies an already existing dcb that we are going to open
DesiredAccess - Supplies the desired access of the caller
ShareAccess - Supplies the share access of the caller
DoesNameExist - Indicates if the file name already exists in the
target directory.
Return Value:
IO_STATUS_BLOCK - Returns the completion status for the operation
--*/
{
IO_STATUS_BLOCK Iosb;
//
// The following variables are for abnormal termination
//
BOOLEAN UnwindShareAccess = FALSE;
PCCB UnwindCcb = NULL;
BOOLEAN UnwindCounts = FALSE;
BOOLEAN DcbAcquired = FALSE;
DebugTrace(+1, Dbg, "FatOpenTargetDirectory...\n", 0);
//
// Get the Dcb exlcusive. This is important as cleanup does not
// acquire the Vcb.
//
(VOID)FatAcquireExclusiveFcb( IrpContext, Dcb );
DcbAcquired = TRUE;
try {
ULONG i;
//
// If the Dcb is already opened by someone then we need
// to check the share access
//
if (Dcb->OpenCount > 0) {
if (!NT_SUCCESS(Iosb.Status = IoCheckShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Dcb->ShareAccess,
TRUE ))) {
try_return( Iosb );
}
} else {
IoSetShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Dcb->ShareAccess );
}
UnwindShareAccess = TRUE;
//
// Setup the context and section object pointers, and update
// our reference counts
//
FatSetFileObject( FileObject,
UserDirectoryOpen,
Dcb,
UnwindCcb = FatCreateCcb( IrpContext ));
Dcb->UncleanCount += 1;
Dcb->OpenCount += 1;
Dcb->Vcb->OpenFileCount += 1;
if (IsFileObjectReadOnly(FileObject)) { Dcb->Vcb->ReadOnlyCount += 1; }
UnwindCounts = TRUE;
//
// Update the name in the file object, by definition the remaining
// part must be shorter than the original file name so we'll just
// overwrite the file name.
//
i = FileObject->FileName.Length/sizeof(WCHAR) - 1;
//
// Get rid of a trailing backslash
//
if (FileObject->FileName.Buffer[i] == L'\\') {
ASSERT(i != 0);
FileObject->FileName.Length -= sizeof(WCHAR);
i -= 1;
}
//
// Find the first non-backslash character. i will be its index.
//
while (TRUE) {
if (FileObject->FileName.Buffer[i] == L'\\') {
i += 1;
break;
}
if (i == 0) {
break;
}
i--;
}
if (i) {
FileObject->FileName.Length -= (USHORT)(i * sizeof(WCHAR));
RtlCopyMemory( &FileObject->FileName.Buffer[0],
&FileObject->FileName.Buffer[i],
FileObject->FileName.Length );
}
//
// And set our status to success
//
Iosb.Status = STATUS_SUCCESS;
Iosb.Information = (DoesNameExist ? FILE_EXISTS : FILE_DOES_NOT_EXIST);
try_exit: NOTHING;
} finally {
DebugUnwind( FatOpenTargetDirectory );
//
// If this is an abnormal termination then undo our work
//
if (AbnormalTermination()) {
if (UnwindCounts) {
Dcb->UncleanCount -= 1;
Dcb->OpenCount -= 1;
Dcb->Vcb->OpenFileCount -= 1;
if (IsFileObjectReadOnly(FileObject)) { Dcb->Vcb->ReadOnlyCount -= 1; }
}
if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, UnwindCcb ); }
if (UnwindShareAccess) { IoRemoveShareAccess( FileObject, &Dcb->ShareAccess ); }
}
if (DcbAcquired) {
FatReleaseFcb( IrpContext, Dcb );
}
DebugTrace(-1, Dbg, "FatOpenTargetDirectory -> Iosb.Status = %08lx\n", Iosb.Status);
}
return Iosb;
}
//
// Internal support routine
//
IO_STATUS_BLOCK
FatOpenExistingDirectory (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PDCB ParentDcb,
IN PDIRENT Dirent,
IN ULONG LfnByteOffset,
IN ULONG DirentByteOffset,
IN PUNICODE_STRING Lfn,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG CreateDisposition,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN DeleteOnClose
)
/*++
Routine Description:
This routine opens the specified directory. The directory has not
previously been opened.
Arguments:
FileObject - Supplies the File object
Vcb - Supplies the Vcb denoting the volume containing the dcb
ParentDcb - Supplies the parent directory containing the subdirectory
to be opened
DirectoryName - Supplies the file name of the directory being opened.
Dirent - Supplies the dirent for the directory being opened
LfnByteOffset - Tells where the Lfn begins. If there is no Lfn
this field is the same as DirentByteOffset.
DirentByteOffset - Supplies the Vbo of the dirent within its parent
directory
Lfn - May supply a long name for the file.
DesiredAccess - Supplies the desired access of the caller
ShareAccess - Supplies the share access of the caller
CreateDisposition - Supplies the create disposition for this operation
NoEaKnowledge - This opener doesn't understand Ea's and we fail this
open if the file has NeedEa's.
DeleteOnClose - The caller wants the file gone when the handle is closed
Return Value:
IO_STATUS_BLOCK - Returns the completion status for the operation
--*/
{
IO_STATUS_BLOCK Iosb;
PDCB Dcb;
//
// The following variables are for abnormal termination
//
PDCB UnwindDcb = NULL;
PCCB UnwindCcb = NULL;
BOOLEAN UnwindCounts = FALSE;
DebugTrace(+1, Dbg, "FatOpenExistingDirectory...\n", 0);
try {
//
// If the caller has no Ea knowledge, we immediately check for
// Need Ea's on the file.
//
if (NoEaKnowledge) {
ULONG NeedEaCount;
FatGetNeedEaCount( IrpContext,
Vcb,
Dirent,
&NeedEaCount );
if (NeedEaCount != 0) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
}
//
// Check the create disposition and desired access
//
if ((CreateDisposition != FILE_OPEN) &&
(CreateDisposition != FILE_OPEN_IF)) {
Iosb.Status = STATUS_OBJECT_NAME_COLLISION;
try_return( Iosb );
}
if (!FatCheckFileAccess( IrpContext,
Dirent->Attributes,
DesiredAccess)) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
//
// Create a new dcb for the directory
//
Dcb = UnwindDcb = FatCreateDcb( IrpContext,
Vcb,
ParentDcb,
LfnByteOffset,
DirentByteOffset,
Dirent,
Lfn );
//
// Setup our share access
//
IoSetShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Dcb->ShareAccess );
//
// Setup the context and section object pointers, and update
// our reference counts
//
FatSetFileObject( FileObject,
UserDirectoryOpen,
Dcb,
UnwindCcb = FatCreateCcb( IrpContext ));
Dcb->UncleanCount += 1;
Dcb->OpenCount += 1;
Vcb->OpenFileCount += 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
UnwindCounts = TRUE;
//
// And set our status to success
//
Iosb.Status = STATUS_SUCCESS;
Iosb.Information = FILE_OPENED;
try_exit: NOTHING;
} finally {
DebugUnwind( FatOpenExistingDirectory );
//
// If this is an abnormal termination then undo our work
//
if (AbnormalTermination()) {
if (UnwindCounts) {
Dcb->UncleanCount -= 1;
Dcb->OpenCount -= 1;
Vcb->OpenFileCount -= 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
}
if (UnwindDcb != NULL) { FatDeleteFcb( IrpContext, UnwindDcb ); }
if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, UnwindCcb ); }
}
DebugTrace(-1, Dbg, "FatOpenExistingDirectory -> Iosb.Status = %08lx\n", Iosb.Status);
}
return Iosb;
}
//
// Internal support routine
//
IO_STATUS_BLOCK
FatOpenExistingFile (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PDCB ParentDcb,
IN PDIRENT Dirent,
IN ULONG LfnByteOffset,
IN ULONG DirentByteOffset,
IN PUNICODE_STRING Lfn,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG AllocationSize,
IN PFILE_FULL_EA_INFORMATION EaBuffer,
IN ULONG EaLength,
IN UCHAR FileAttributes,
IN ULONG CreateDisposition,
IN BOOLEAN IsPagingFile,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN DeleteOnClose,
IN BOOLEAN FileNameOpenedDos
)
/*++
Routine Description:
This routine opens the specified file. The file has not previously
been opened.
Arguments:
FileObject - Supplies the File object
Vcb - Supplies the Vcb denoting the volume containing the file
ParentFcb - Supplies the parent directory containing the file to be
opened
Dirent - Supplies the dirent for the file being opened
LfnByteOffset - Tells where the Lfn begins. If there is no Lfn
this field is the same as DirentByteOffset.
DirentByteOffset - Supplies the Vbo of the dirent within its parent
directory
Lfn - May supply a long name for the file.
DesiredAccess - Supplies the desired access of the caller
ShareAccess - Supplies the share access of the caller
AllocationSize - Supplies the initial allocation if the file is being
superseded, overwritten, or created.
EaBuffer - Supplies the Ea set if the file is being superseded,
overwritten, or created.
EaLength - Supplies the size, in byte, of the EaBuffer
FileAttributes - Supplies file attributes to use if the file is being
superseded, overwritten, or created
CreateDisposition - Supplies the create disposition for this operation
IsPagingFile - Indicates if this is the paging file being opened.
NoEaKnowledge - This opener doesn't understand Ea's and we fail this
open if the file has NeedEa's.
DeleteOnClose - The caller wants the file gone when the handle is closed
FileNameOpenedDos - The caller opened this file by hitting the 8.3 side
of the Lfn/8.3 pair
Return Value:
IO_STATUS_BLOCK - Returns the completion status for the operation
--*/
{
IO_STATUS_BLOCK Iosb;
PFCB Fcb;
//
// The following variables are for abnormal termination
//
PFCB UnwindFcb = NULL;
PCCB UnwindCcb = NULL;
BOOLEAN UnwindCounts = FALSE;
DebugTrace(+1, Dbg, "FatOpenExistingFile...\n", 0);
try {
//
// Check if the user wanted to create the file or if access is
// denied
//
if (CreateDisposition == FILE_CREATE) {
Iosb.Status = STATUS_OBJECT_NAME_COLLISION;
try_return( Iosb );
} else if ((CreateDisposition == FILE_SUPERSEDE) && !IsPagingFile) {
DesiredAccess |= DELETE;
} else if (((CreateDisposition == FILE_OVERWRITE) ||
(CreateDisposition == FILE_OVERWRITE_IF)) && !IsPagingFile) {
DesiredAccess |= FILE_WRITE_DATA | FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES;
}
if (!FatCheckFileAccess( IrpContext,
Dirent->Attributes,
DesiredAccess)) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
//
// Check for trying to delete a read only file.
//
if (DeleteOnClose &&
FlagOn( Dirent->Attributes, FAT_DIRENT_ATTR_READ_ONLY )) {
Iosb.Status = STATUS_CANNOT_DELETE;
try_return( Iosb );
}
//
// IF we are asked to do an overwrite or supersede operation then
// deny access for files where the file attributes for system and
// hidden do not match
//
if ((CreateDisposition == FILE_SUPERSEDE) ||
(CreateDisposition == FILE_OVERWRITE) ||
(CreateDisposition == FILE_OVERWRITE_IF)) {
BOOLEAN Hidden;
BOOLEAN System;
Hidden = BooleanFlagOn(Dirent->Attributes, FAT_DIRENT_ATTR_HIDDEN );
System = BooleanFlagOn(Dirent->Attributes, FAT_DIRENT_ATTR_SYSTEM );
if ((Hidden && !FlagOn(FileAttributes, FILE_ATTRIBUTE_HIDDEN)) ||
(System && !FlagOn(FileAttributes, FILE_ATTRIBUTE_SYSTEM))) {
DebugTrace(0, Dbg, "The hidden and/or system bits do not match\n", 0);
if ( !IsPagingFile ) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
}
#if defined(WE_WON_ON_APPEAL) && !defined(DOUBLE_SPACE_WRITE)
if (Vcb->Dscb != NULL) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
#endif
//
// If this media is write protected, don't even try the create.
//
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_WRITE_PROTECTED)) {
//
// Set the real device for the pop-up info, and set the verify
// bit in the device object, so that we will force a verify
// in case the user put the correct media back in.
//
IoSetHardErrorOrVerifyDevice( IrpContext->OriginatingIrp,
Vcb->Vpb->RealDevice );
SetFlag(Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME);
FatRaiseStatus( IrpContext, STATUS_MEDIA_WRITE_PROTECTED );
}
}
//
// Create a new Fcb for the file, and set the file size in
// the fcb.
//
Fcb = UnwindFcb = FatCreateFcb( IrpContext,
Vcb,
ParentDcb,
LfnByteOffset,
DirentByteOffset,
Dirent,
Lfn,
IsPagingFile );
//
// Get the starting cluster of the aqllocation, and if it is zero,
// there is no allocation, so note it in the Fcb.
//
Fcb->FirstClusterOfFile = (ULONG)Dirent->FirstClusterOfFile;
if ( Fcb->FirstClusterOfFile == 0 ) {
Fcb->Header.AllocationSize.QuadPart = 0;
}
//
// If this is a paging file, lookup the allocation size so that
// the Mcb is always valid, and mark this a system file to prevent
// it from being opened.
//
if (IsPagingFile) {
FatLookupFileAllocationSize( IrpContext, Fcb );
SetFlag( Fcb->FcbState, FCB_STATE_SYSTEM_FILE );
}
//
// Now case on whether we are to simply open, supersede, or
// overwrite the file.
//
switch (CreateDisposition) {
case FILE_OPEN:
case FILE_OPEN_IF:
DebugTrace(0, Dbg, "Doing only an open operation\n", 0);
//
// If the caller has no Ea knowledge, we immediately check for
// Need Ea's on the file.
//
if (NoEaKnowledge) {
ULONG NeedEaCount;
FatGetNeedEaCount( IrpContext,
Vcb,
Dirent,
&NeedEaCount );
if (NeedEaCount != 0) {
FatRaiseStatus( IrpContext, STATUS_ACCESS_DENIED );
}
}
//
// Setup the context and section object pointers.
//
FatSetFileObject( FileObject,
UserFileOpen,
Fcb,
UnwindCcb = FatCreateCcb( IrpContext ));
FileObject->SectionObjectPointer = &Fcb->NonPaged->SectionObjectPointers;
Iosb.Status = STATUS_SUCCESS;
Iosb.Information = FILE_OPENED;
break;
case FILE_SUPERSEDE:
case FILE_OVERWRITE:
case FILE_OVERWRITE_IF:
{
PACCESS_STATE AccessState;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( IrpContext->OriginatingIrp );
DebugTrace(0, Dbg, "Doing supersede/overwrite operation\n", 0);
//
// We check if the caller wants ACCESS_SYSTEM_SECURITY access on this
// directory and fail the request if he does.
//
AccessState = IrpSp->Parameters.Create.SecurityContext->AccessState;
//
// Check if the remaining privilege includes ACCESS_SYSTEM_SECURITY.
//
if (FlagOn( AccessState->RemainingDesiredAccess, ACCESS_SYSTEM_SECURITY )) {
if (!SeSinglePrivilegeCheck( FatSecurityPrivilege,
UserMode )) {
Iosb.Status = STATUS_ACCESS_DENIED;
try_return( Iosb );
}
//
// Move this privilege from the Remaining access to Granted access.
//
ClearFlag( AccessState->RemainingDesiredAccess, ACCESS_SYSTEM_SECURITY );
SetFlag( AccessState->PreviouslyGrantedAccess, ACCESS_SYSTEM_SECURITY );
}
}
Iosb = FatSupersedeOrOverwriteFile( IrpContext,
FileObject,
Fcb,
DesiredAccess,
ShareAccess,
AllocationSize,
EaBuffer,
EaLength,
FileAttributes,
CreateDisposition,
NoEaKnowledge );
break;
default:
DebugTrace(0, Dbg, "Illegal Create Disposition\n", 0);
FatBugCheck( CreateDisposition, 0, 0 );
break;
}
try_exit: NOTHING;
//
// Setup our share access and counts if things were successful.
//
if ((Iosb.Status != STATUS_PENDING) && NT_SUCCESS(Iosb.Status)) {
IoSetShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Fcb->ShareAccess );
Fcb->UncleanCount += 1;
Fcb->OpenCount += 1;
if (FlagOn(FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING)) {
Fcb->NonCachedUncleanCount += 1;
}
Vcb->OpenFileCount += 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
UnwindCounts = TRUE;
}
{
PCCB Ccb;
Ccb = (PCCB)FileObject->FsContext2;
if ( NT_SUCCESS(Iosb.Status) ) {
//
// Mark the DeleteOnClose bit if the operation was successful.
//
if ( DeleteOnClose ) {
SetFlag( Ccb->Flags, CCB_FLAG_DELETE_ON_CLOSE );
}
//
// Mark the OpenedByShortName bit if the operation was successful.
//
if ( FileNameOpenedDos ) {
SetFlag( Ccb->Flags, CCB_FLAG_OPENED_BY_SHORTNAME );
}
}
}
} finally {
DebugUnwind( FatOpenExistingFile );
//
// If this is an abnormal termination then undo our work
//
if (AbnormalTermination()) {
if (UnwindCounts) {
Fcb->UncleanCount -= 1;
Fcb->OpenCount -= 1;
if (FlagOn(FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING)) {
Fcb->NonCachedUncleanCount -= 1;
}
Vcb->OpenFileCount -= 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
}
if (UnwindFcb != NULL) { FatDeleteFcb( IrpContext, UnwindFcb ); }
if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, UnwindCcb ); }
}
DebugTrace(-1, Dbg, "FatOpenExistingFile -> Iosb.Status = %08lx\n", Iosb.Status);
}
return Iosb;
}
//
// Internal support routine
//
IO_STATUS_BLOCK
FatCreateNewDirectory (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PDCB ParentDcb,
IN POEM_STRING OemName,
IN PUNICODE_STRING UnicodeName,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN PFILE_FULL_EA_INFORMATION EaBuffer,
IN ULONG EaLength,
IN UCHAR FileAttributes,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN DeleteOnClose
)
/*++
Routine Description:
This routine creates a new directory. The directory has already been
verified not to exist yet.
Arguments:
FileObject - Supplies the file object for the newly created directory
Vcb - Supplies the Vcb denote the volume to contain the new directory
ParentDcb - Supplies the parent directory containg the newly created
directory
OemName - Supplies the Oem name for the newly created directory. It may
or maynot be 8.3 complient, but will be upcased.
UnicodeName - Supplies the Unicode name for the newly created directory.
It may or maynot be 8.3 complient. This name contains the original
case information.
DesiredAccess - Supplies the desired access of the caller
ShareAccess - Supplies the shared access of the caller
EaBuffer - Supplies the Ea set for the newly created directory
EaLength - Supplies the length, in bytes, of EaBuffer
FileAttributes - Supplies the file attributes for the newly created
directory.
NoEaKnowledge - This opener doesn't understand Ea's and we fail this
open if the file has NeedEa's.
DeleteOnClose - The caller wants the file gone when the handle is closed
Return Value:
IO_STATUS_BLOCK - Returns the completion status for the operation
--*/
{
IO_STATUS_BLOCK Iosb;
PDCB Dcb = NULL;
PCCB Ccb = NULL;
PDIRENT Dirent = NULL;
PBCB DirentBcb = NULL;
ULONG DirentsNeeded;
ULONG DirentByteOffset;
PDIRENT ShortDirent;
ULONG ShortDirentByteOffset;
USHORT EaHandle;
BOOLEAN AllLowerComponent;
BOOLEAN AllLowerExtension;
BOOLEAN CreateLfn;
ULONG BytesInFirstPage;
ULONG DirentsInFirstPage;
PDIRENT FirstPageDirent;
PBCB SecondPageBcb = NULL;
ULONG SecondPageOffset;
PDIRENT SecondPageDirent;
BOOLEAN DirentFromPool = FALSE;
OEM_STRING ShortName;
UCHAR ShortNameBuffer[12];
DebugTrace(+1, Dbg, "FatCreateNewDirectory...\n", 0);
ShortName.Length = 0;
ShortName.MaximumLength = 12;
ShortName.Buffer = &ShortNameBuffer[0];
EaHandle = 0;
//
// We fail this operation if the caller doesn't understand Ea's.
//
if (NoEaKnowledge
&& EaLength > 0) {
Iosb.Status = STATUS_ACCESS_DENIED;
DebugTrace(-1, Dbg, "FatCreateNewDirectory -> Iosb.Status = %08lx\n", Iosb.Status);
return Iosb;
}
//
// DeleteOnClose and ReadOnly are not compatible.
//
if (DeleteOnClose && FlagOn(FileAttributes, FAT_DIRENT_ATTR_READ_ONLY)) {
Iosb.Status = STATUS_CANNOT_DELETE;
return Iosb;
}
// Now get the names that we will be using.
//
FatSelectNames( IrpContext,
ParentDcb,
OemName,
UnicodeName,
&ShortName,
NULL,
&AllLowerComponent,
&AllLowerExtension,
&CreateLfn );
//
// If we are not in Chicago mode, ignore the magic bits.
//
if (!FatData.ChicagoMode) {
AllLowerComponent = FALSE;
AllLowerExtension = FALSE;
CreateLfn = FALSE;
}
//
// Create/allocate a new dirent
//
DirentsNeeded = CreateLfn ? FAT_LFN_DIRENTS_NEEDED(UnicodeName) + 1 : 1;
DirentByteOffset = FatCreateNewDirent( IrpContext,
ParentDcb,
DirentsNeeded );
try {
FatPrepareWriteDirectoryFile( IrpContext,
ParentDcb,
DirentByteOffset,
sizeof(DIRENT),
&DirentBcb,
&Dirent,
FALSE,
&Iosb.Status );
ASSERT( NT_SUCCESS( Iosb.Status ) );
//
// Deal with the special case of an LFN + Dirent structure crossing
// a page boundry.
//
if ((DirentByteOffset / PAGE_SIZE) !=
((DirentByteOffset + (DirentsNeeded - 1) * sizeof(DIRENT)) / PAGE_SIZE)) {
SecondPageBcb;
SecondPageOffset;
SecondPageDirent;
SecondPageOffset = (DirentByteOffset & ~(PAGE_SIZE - 1)) + PAGE_SIZE;
BytesInFirstPage = SecondPageOffset - DirentByteOffset;
DirentsInFirstPage = BytesInFirstPage / sizeof(DIRENT);
FatPrepareWriteDirectoryFile( IrpContext,
ParentDcb,
SecondPageOffset,
sizeof(DIRENT),
&SecondPageBcb,
&SecondPageDirent,
FALSE,
&Iosb.Status );
ASSERT( NT_SUCCESS( Iosb.Status ) );
FirstPageDirent = Dirent;
Dirent = FsRtlAllocatePool( PagedPool,
DirentsNeeded * sizeof(DIRENT) );
DirentFromPool = TRUE;
}
//
// Bump up Dirent and DirentByteOffset
//
ShortDirent = Dirent + DirentsNeeded - 1;
ShortDirentByteOffset = DirentByteOffset +
(DirentsNeeded - 1) * sizeof(DIRENT);
ASSERT( NT_SUCCESS( Iosb.Status ));
//
// Fill in the fields of the dirent, and mark the bcb dirty
//
FatConstructDirent( IrpContext,
ShortDirent,
&ShortName,
AllLowerComponent,
AllLowerExtension,
CreateLfn ? UnicodeName : NULL,
(UCHAR)(FileAttributes | FAT_DIRENT_ATTR_DIRECTORY),
TRUE,
NULL );
//
// If the dirent crossed pages, we have to do some real gross stuff.
//
if (DirentFromPool) {
RtlCopyMemory( FirstPageDirent, Dirent, BytesInFirstPage );
RtlCopyMemory( SecondPageDirent,
Dirent + DirentsInFirstPage,
DirentsNeeded*sizeof(DIRENT) - BytesInFirstPage );
FatSetDirtyBcb( IrpContext, SecondPageBcb, Vcb );
ShortDirent = SecondPageDirent + (DirentsNeeded - DirentsInFirstPage) - 1;
}
FatSetDirtyBcb( IrpContext, DirentBcb, Vcb );
//
// Create a new dcb for the directory.
//
Dcb = FatCreateDcb( IrpContext,
Vcb,
ParentDcb,
DirentByteOffset,
ShortDirentByteOffset,
ShortDirent,
CreateLfn ? UnicodeName : NULL );
//
// Tentatively add the new Ea's,
//
if (EaLength > 0) {
//
// This returns false if we are trying to create a file
// with Need Ea's and don't understand EA's.
//
FatCreateEa( IrpContext,
Dcb->Vcb,
(PUCHAR) EaBuffer,
EaLength,
&Dcb->ShortName.Name.Oem,
&EaHandle );
}
ShortDirent->ExtendedAttributes = EaHandle;
//
// After this point we cannot just simply mark the dirent deleted,
// we have to deal with the directory file object.
//
//
// Make the dirent into a directory. Note that even if this call
// raises because of disk space, the diectory file object has been
// created.
//
FatInitializeDirectoryDirent( IrpContext, Dcb, ShortDirent );
//
// Setup the context and section object pointers, and update
// our reference counts. Note that this call cannot fail.
//
FatSetFileObject( FileObject,
UserDirectoryOpen,
Dcb,
Ccb = FatCreateCcb( IrpContext ) );
//
// Initialize the LongFileName right now so that FatNotify
// below won't have to.
//
FatSetFullNameInFcb( IrpContext, Dcb, UnicodeName );
//
// We call the notify package to report that the
// we added a file.
//
FatNotifyReportChange( IrpContext,
Vcb,
Dcb,
FILE_NOTIFY_CHANGE_DIR_NAME,
FILE_ACTION_ADDED );
//
// Setup our share access
//
IoSetShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Dcb->ShareAccess );
//
// From this point on, nothing can raise.
//
Dcb->UncleanCount += 1;
Dcb->OpenCount += 1;
Vcb->OpenFileCount += 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
if (DeleteOnClose) {
SetFlag( Ccb->Flags, CCB_FLAG_DELETE_ON_CLOSE );
}
//
// And set our return status
//
Iosb.Status = STATUS_SUCCESS;
Iosb.Information = FILE_CREATED;
} finally {
DebugUnwind( FatCreateNewDirectory );
//
// If this is an abnormal termination then undo our work
//
if (AbnormalTermination()) {
if ( Dcb == NULL) {
ASSERT( (ParentDcb->Specific.Dcb.UnusedDirentVbo == 0xffffffff) ||
RtlAreBitsSet( &ParentDcb->Specific.Dcb.FreeDirentBitmap,
DirentByteOffset / sizeof(DIRENT),
DirentsNeeded ) );
RtlClearBits( &ParentDcb->Specific.Dcb.FreeDirentBitmap,
DirentByteOffset / sizeof(DIRENT),
DirentsNeeded );
//
// Mark the dirents deleted. The codes is complex because of
// dealing with an LFN than crosses a page boundry.
//
if (Dirent != NULL) {
ULONG i;
//
// We failed before creating a directory file object.
// We can just mark the dirent deleted and exit.
//
for (i = 0; i < DirentsNeeded; i++) {
if (DirentFromPool == FALSE) {
//
// Simple case.
//
Dirent[i].FileName[0] = FAT_DIRENT_DELETED;
} else {
//
// If the second CcPreparePinWrite failed, we have
// to stop early.
//
if ((SecondPageBcb == NULL) &&
(i == DirentsInFirstPage)) {
break;
}
//
// Now conditionally update either page.
//
if (i < DirentsInFirstPage) {
FirstPageDirent[i].FileName[0] = FAT_DIRENT_DELETED;
} else {
SecondPageDirent[i - DirentsInFirstPage].FileName[0] = FAT_DIRENT_DELETED;
}
}
}
}
} else {
//
// We have created the Dcb. If an error occurred while
// creating the Ea's, there will be no directory file
// object.
//
PFILE_OBJECT DirectoryFileObject;
DirectoryFileObject = Dcb->Specific.Dcb.DirectoryFile;
FatTruncateFileAllocation( IrpContext, Dcb, 0);
if (DirectoryFileObject != NULL) {
FatSyncUninitializeCacheMap( IrpContext,
DirectoryFileObject );
}
//
// Remove the directory entry we made in the parent Dcb.
//
FatDeleteDirent( IrpContext, Dcb, NULL, TRUE );
//
// Finnaly, dereference the directory file object. This will
// cause a close Irp to be processed, blowing away the Fcb.
//
if (DirectoryFileObject != NULL) {
//
// BUGBUG The following is a fix for the PDK
// only. By making this an unopened stream file
// we won't try to clean up our parent.
//
Dcb->Specific.Dcb.DirectoryFileOpenCount -= 1;
Dcb->Specific.Dcb.DirectoryFile = NULL;
FatSetFileObject( DirectoryFileObject,
UnopenedFileObject,
NULL,
NULL );
ObDereferenceObject( DirectoryFileObject );
}
//
// BUGBUG This is also a PDK fix. If the stream file
// exists, this is would be done during the dereference
// file object operation. Otherwise we have to remove
// the Dcb and check if we should remove the parent.
// For now we will just leave the parent lying around.
//
FatDeleteFcb( IrpContext, Dcb );
}
//
// Finally (no pun intended), we always have to delete the Ccb
// if we created one.
//
if ( Ccb != NULL ) {
FatDeleteCcb( IrpContext, Ccb );
}
}
FatUnpinBcb( IrpContext, DirentBcb );
if (DirentFromPool) {
ExFreePool( Dirent );
FatUnpinBcb( IrpContext, SecondPageBcb );
}
DebugTrace(-1, Dbg, "FatCreateNewDirectory -> Iosb.Status = %08lx\n", Iosb.Status);
}
UNREFERENCED_PARAMETER( EaBuffer );
UNREFERENCED_PARAMETER( EaLength );
return Iosb;
}
//
// Internal support routine
//
IO_STATUS_BLOCK
FatCreateNewFile (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PVCB Vcb,
IN PDCB ParentDcb,
IN POEM_STRING OemName,
IN PUNICODE_STRING UnicodeName,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG AllocationSize,
IN PFILE_FULL_EA_INFORMATION EaBuffer,
IN ULONG EaLength,
IN UCHAR FileAttributes,
IN PUNICODE_STRING LfnBuffer,
IN BOOLEAN IsPagingFile,
IN BOOLEAN NoEaKnowledge,
IN BOOLEAN DeleteOnClose,
IN BOOLEAN TemporaryFile
)
/*++
Routine Description:
This routine creates a new file. The file has already been verified
not to exist yet.
Arguments:
FileObject - Supplies the file object for the newly created file
Vcb - Supplies the Vcb denote the volume to contain the new file
ParentDcb - Supplies the parent directory containg the newly created
File
OemName - Supplies the Oem name for the newly created file. It may
or maynot be 8.3 complient, but will be upcased.
UnicodeName - Supplies the Unicode name for the newly created file.
It may or maynot be 8.3 complient. This name contains the original
case information.
DesiredAccess - Supplies the desired access of the caller
ShareAccess - Supplies the shared access of the caller
AllocationSize - Supplies the initial allocation size for the file
EaBuffer - Supplies the Ea set for the newly created file
EaLength - Supplies the length, in bytes, of EaBuffer
FileAttributes - Supplies the file attributes for the newly created
file
LfnBuffer - A MAX_LFN sized buffer for directory searching
IsPagingFile - Indicates if this is the paging file being created
NoEaKnowledge - This opener doesn't understand Ea's and we fail this
open if the file has NeedEa's.
DeleteOnClose - The caller wants the file gone when the handle is closed
TemporaryFile - Signals the lazywriter to not write dirty data unless
absolutely has to.
Return Value:
IO_STATUS_BLOCK - Returns the completion status for the operation
--*/
{
IO_STATUS_BLOCK Iosb;
PFCB Fcb;
PDIRENT Dirent = NULL;
PBCB DirentBcb = NULL;
ULONG DirentsNeeded;
ULONG DirentByteOffset;
PDIRENT ShortDirent;
ULONG ShortDirentByteOffset;
USHORT EaHandle;
BOOLEAN AllLowerComponent;
BOOLEAN AllLowerExtension;
BOOLEAN CreateLfn;
ULONG BytesInFirstPage;
ULONG DirentsInFirstPage;
PDIRENT FirstPageDirent;
PBCB SecondPageBcb = NULL;
ULONG SecondPageOffset;
PDIRENT SecondPageDirent;
BOOLEAN DirentFromPool = FALSE;
OEM_STRING ShortName;
UCHAR ShortNameBuffer[12];
UNICODE_STRING UniTunneledShortName;
WCHAR UniTunneledShortNameBuffer[12];
UNICODE_STRING UniTunneledLongName;
WCHAR UniTunneledLongNameBuffer[26];
LARGE_INTEGER TunneledCreationTime;
ULONG TunneledDataSize;
BOOLEAN HaveTunneledInformation;
BOOLEAN UsingTunneledLfn = FALSE;
PUNICODE_STRING RealUnicodeName;
//
// The following variables are for abnormal termination
//
PDIRENT UnwindDirent = NULL;
PFCB UnwindFcb = NULL;
BOOLEAN UnwindAllocation = FALSE;
PCCB UnwindCcb = NULL;
BOOLEAN UnwindCounts = 0;
DebugTrace(+1, Dbg, "FatCreateNewFile...\n", 0);
ShortName.Length = 0;
ShortName.MaximumLength = sizeof(ShortNameBuffer);
ShortName.Buffer = &ShortNameBuffer[0];
UniTunneledShortName.Length = 0;
UniTunneledShortName.MaximumLength = sizeof(UniTunneledShortNameBuffer);
UniTunneledShortName.Buffer = &UniTunneledShortNameBuffer[0];
UniTunneledLongName.Length = 0;
UniTunneledLongName.MaximumLength = sizeof(UniTunneledLongNameBuffer);
UniTunneledLongName.Buffer = &UniTunneledLongNameBuffer[0];
DirentBcb = NULL;
EaHandle = 0;
//
// We fail this operation if the caller doesn't understand Ea's.
//
if (NoEaKnowledge
&& EaLength > 0) {
Iosb.Status = STATUS_ACCESS_DENIED;
DebugTrace(-1, Dbg, "FatCreateNewFile -> Iosb.Status = %08lx\n", Iosb.Status);
return Iosb;
}
//
// DeleteOnClose and ReadOnly are not compatible.
//
if (DeleteOnClose && FlagOn(FileAttributes, FAT_DIRENT_ATTR_READ_ONLY)) {
Iosb.Status = STATUS_CANNOT_DELETE;
return Iosb;
}
//
// Look in the tunnel cache for names and timestamps to restore
//
TunneledDataSize = sizeof(LARGE_INTEGER);
HaveTunneledInformation = FsRtlFindInTunnelCache( &Vcb->Tunnel,
FatDirectoryKey(ParentDcb),
UnicodeName,
&UniTunneledShortName,
&UniTunneledLongName,
&TunneledDataSize,
&TunneledCreationTime );
ASSERT(TunneledDataSize == sizeof(LARGE_INTEGER));
//
// Now get the names that we will be using.
//
FatSelectNames( IrpContext,
ParentDcb,
OemName,
UnicodeName,
&ShortName,
(HaveTunneledInformation? &UniTunneledShortName : NULL),
&AllLowerComponent,
&AllLowerExtension,
&CreateLfn );
//
// If we are not in Chicago mode, ignore the magic bits.
//
RealUnicodeName = UnicodeName;
if (!FatData.ChicagoMode) {
AllLowerComponent = FALSE;
AllLowerExtension = FALSE;
CreateLfn = FALSE;
} else {
//
// If the Unicode name was legal for a short name and we got
// a tunneling hit which had a long name associated which is
// avaliable for use, use it.
//
if (!CreateLfn &&
UniTunneledLongName.Length &&
!FatLfnDirentExists(IrpContext, ParentDcb, &UniTunneledLongName, LfnBuffer)) {
UsingTunneledLfn = TRUE;
CreateLfn = TRUE;
RealUnicodeName = &UniTunneledLongName;
//
// Short names are always upcase if an LFN exists
//
AllLowerComponent = FALSE;
AllLowerExtension = FALSE;
}
}
//
// Create/allocate a new dirent
//
DirentsNeeded = CreateLfn ? FAT_LFN_DIRENTS_NEEDED(RealUnicodeName) + 1 : 1;
DirentByteOffset = FatCreateNewDirent( IrpContext,
ParentDcb,
DirentsNeeded );
try {
FatPrepareWriteDirectoryFile( IrpContext,
ParentDcb,
DirentByteOffset,
sizeof(DIRENT),
&DirentBcb,
&Dirent,
FALSE,
&Iosb.Status );
ASSERT( NT_SUCCESS( Iosb.Status ) );
UnwindDirent = Dirent;
//
// Deal with the special case of an LFN + Dirent structure crossing
// a page boundry.
//
if ((DirentByteOffset / PAGE_SIZE) !=
((DirentByteOffset + (DirentsNeeded - 1) * sizeof(DIRENT)) / PAGE_SIZE)) {
SecondPageBcb;
SecondPageOffset;
SecondPageDirent;
SecondPageOffset = (DirentByteOffset & ~(PAGE_SIZE - 1)) + PAGE_SIZE;
BytesInFirstPage = SecondPageOffset - DirentByteOffset;
DirentsInFirstPage = BytesInFirstPage / sizeof(DIRENT);
FatPrepareWriteDirectoryFile( IrpContext,
ParentDcb,
SecondPageOffset,
sizeof(DIRENT),
&SecondPageBcb,
&SecondPageDirent,
FALSE,
&Iosb.Status );
ASSERT( NT_SUCCESS( Iosb.Status ) );
FirstPageDirent = Dirent;
Dirent = FsRtlAllocatePool( PagedPool,
DirentsNeeded * sizeof(DIRENT) );
DirentFromPool = TRUE;
}
//
// Bump up Dirent and DirentByteOffset
//
ShortDirent = Dirent + DirentsNeeded - 1;
ShortDirentByteOffset = DirentByteOffset +
(DirentsNeeded - 1) * sizeof(DIRENT);
ASSERT( NT_SUCCESS( Iosb.Status ));
//
// Fill in the fields of the dirent, and mark the bcb dirty
//
FatConstructDirent( IrpContext,
ShortDirent,
&ShortName,
AllLowerComponent,
AllLowerExtension,
CreateLfn ? RealUnicodeName : NULL,
(UCHAR)(FileAttributes | FILE_ATTRIBUTE_ARCHIVE),
TRUE,
(HaveTunneledInformation ? &TunneledCreationTime : NULL) );
//
// If the dirent crossed pages, we have to do some real gross stuff.
//
if (DirentFromPool) {
RtlCopyMemory( FirstPageDirent, Dirent, BytesInFirstPage );
RtlCopyMemory( SecondPageDirent,
Dirent + DirentsInFirstPage,
DirentsNeeded*sizeof(DIRENT) - BytesInFirstPage );
FatSetDirtyBcb( IrpContext, SecondPageBcb, Vcb );
ShortDirent = SecondPageDirent + (DirentsNeeded - DirentsInFirstPage) - 1;
}
FatSetDirtyBcb( IrpContext, DirentBcb, Vcb );
//
// Create a new Fcb for the file. Once the Fcb is created we
// will not need to unwind dirent because delete dirent will
// now do the work.
//
Fcb = UnwindFcb = FatCreateFcb( IrpContext,
Vcb,
ParentDcb,
DirentByteOffset,
ShortDirentByteOffset,
ShortDirent,
CreateLfn ? RealUnicodeName : NULL,
IsPagingFile );
UnwindDirent = NULL;
//
// If this is a temporary file, note it in the FcbState
//
if (TemporaryFile) {
SetFlag( Fcb->FcbState, FCB_STATE_TEMPORARY );
}
//
// Add some initial file allocation
//
FatAddFileAllocation( IrpContext, Fcb, FileObject, AllocationSize );
UnwindAllocation = TRUE;
Fcb->FcbState |= FCB_STATE_TRUNCATE_ON_CLOSE;
//
// Tentatively add the new Ea's
//
if ( EaLength > 0 ) {
FatCreateEa( IrpContext,
Fcb->Vcb,
(PUCHAR) EaBuffer,
EaLength,
&Fcb->ShortName.Name.Oem,
&EaHandle );
}
ShortDirent->ExtendedAttributes = EaHandle;
//
// Initialize the LongFileName right now so that FatNotify
// below won't have to.
//
FatSetFullNameInFcb( IrpContext, Fcb, RealUnicodeName );
//
// Setup the context and section object pointers, and update
// our reference counts
//
FatSetFileObject( FileObject,
UserFileOpen,
Fcb,
UnwindCcb = FatCreateCcb( IrpContext ));
FileObject->SectionObjectPointer = &Fcb->NonPaged->SectionObjectPointers;
//
// We call the notify package to report that the
// we added a file.
//
FatNotifyReportChange( IrpContext,
Vcb,
Fcb,
FILE_NOTIFY_CHANGE_FILE_NAME,
FILE_ACTION_ADDED );
//
// Setup our share access
//
IoSetShareAccess( DesiredAccess,
ShareAccess,
FileObject,
&Fcb->ShareAccess );
Fcb->UncleanCount += 1;
Fcb->OpenCount += 1;
if (FlagOn(FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING)) {
Fcb->NonCachedUncleanCount += 1;
}
Vcb->OpenFileCount += 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount += 1; }
UnwindCounts = TRUE;
//
// And set our return status
//
Iosb.Status = STATUS_SUCCESS;
Iosb.Information = FILE_CREATED;
//try_exit: NOTHING;
if ( NT_SUCCESS(Iosb.Status) ) {
//
// Mark the DeleteOnClose bit if the operation was successful.
//
if ( DeleteOnClose ) {
SetFlag( UnwindCcb->Flags, CCB_FLAG_DELETE_ON_CLOSE );
}
//
// Mark the OpenedByShortName bit if the operation was successful.
// If we created an Lfn, we have some sort of generated short name
// and thus don't consider ourselves to have opened it - though we
// may have had a case mix Lfn "Foo.bar" and generated "FOO.BAR"
//
// Unless, of course, we wanted to create a short name and hit an
// associated Lfn in the tunnel cache
//
if ( !CreateLfn && !UsingTunneledLfn ) {
SetFlag( UnwindCcb->Flags, CCB_FLAG_OPENED_BY_SHORTNAME );
}
}
} finally {
DebugUnwind( FatCreateNewFile );
//
// If this is an abnormal termination then undo our work
//
if (AbnormalTermination()) {
if (UnwindFcb == NULL) {
ASSERT( (ParentDcb->Specific.Dcb.UnusedDirentVbo == 0xffffffff) ||
RtlAreBitsSet( &ParentDcb->Specific.Dcb.FreeDirentBitmap,
DirentByteOffset / sizeof(DIRENT),
DirentsNeeded ) );
RtlClearBits( &ParentDcb->Specific.Dcb.FreeDirentBitmap,
DirentByteOffset / sizeof(DIRENT),
DirentsNeeded );
}
//
// Mark the dirents deleted. The codes is complex because of
// dealing with an LFN than crosses a page boundry.
//
if (UnwindDirent != NULL) {
ULONG i;
for (i = 0; i < DirentsNeeded; i++) {
if (DirentFromPool == FALSE) {
//
// Simple case.
//
Dirent[i].FileName[0] = FAT_DIRENT_DELETED;
} else {
//
// If the second CcPreparePinWrite failed, we have
// to stop early.
//
if ((SecondPageBcb == NULL) &&
(i == DirentsInFirstPage)) {
break;
}
//
// Now conditionally update either page.
//
if (i < DirentsInFirstPage) {
FirstPageDirent[i].FileName[0] = FAT_DIRENT_DELETED;
} else {
SecondPageDirent[i - DirentsInFirstPage].FileName[0] = FAT_DIRENT_DELETED;
}
}
}
}
if (UnwindAllocation) { FatTruncateFileAllocation( IrpContext, Fcb, 0 ); }
if (UnwindCounts) {
Fcb->UncleanCount -= 1;
Fcb->OpenCount -= 1;
if (FlagOn(FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING)) {
Fcb->NonCachedUncleanCount -= 1;
}
Vcb->OpenFileCount -= 1;
if (IsFileObjectReadOnly(FileObject)) { Vcb->ReadOnlyCount -= 1; }
}
if (UnwindFcb != NULL) { FatDeleteDirent( IrpContext, UnwindFcb, NULL, TRUE );
FatDeleteFcb( IrpContext, UnwindFcb ); }
if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, UnwindCcb ); }
}
FatUnpinBcb( IrpContext, DirentBcb );
if (DirentFromPool) {
ExFreePool( Dirent );
FatUnpinBcb( IrpContext, SecondPageBcb );
}
if (UniTunneledLongName.Buffer != UniTunneledLongNameBuffer) {
//
// Tunneling package grew the buffer from pool
//
ExFreePool( UniTunneledLongName.Buffer );
}
DebugTrace(-1, Dbg, "FatCreateNewFile -> Iosb.Status = %08lx\n", Iosb.Status);
}
return Iosb;
}
//
// Internal support routine
//
IO_STATUS_BLOCK
FatSupersedeOrOverwriteFile (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN PFCB Fcb,
IN ACCESS_MASK DesiredAccess,
IN USHORT ShareAccess,
IN ULONG AllocationSize,
IN PFILE_FULL_EA_INFORMATION EaBuffer,
IN ULONG EaLength,
IN UCHAR FileAttributes,
IN ULONG CreateDisposition,
IN BOOLEAN NoEaKnowledge
)
/*++
Routine Description:
This routine performs a file supersede or overwrite operation.
Arguments:
FileObject - Supplies a pointer to the file object
Fcb - Supplies a pointer to the Fcb
DesiredAccess - Supplies the desired access
ShareAccess - Supplies the desired share access
AllocationSize - Supplies an initial allocation size
EaBuffer - Supplies the Ea set for the superseded/overwritten file
EaLength - Supplies the length, in bytes, of EaBuffer
FileAttributes - Supplies the supersede/overwrite file attributes
CreateDisposition - Supplies the create disposition for the file
It must be either supersede, overwrite, or overwrite if.
NoEaKnowledge - This opener doesn't understand Ea's and we fail this
open if the file has NeedEa's.
Return Value:
IO_STATUS_BLOCK - Returns the completion status for the operation
--*/
{
IO_STATUS_BLOCK Iosb;
PDIRENT Dirent;
PBCB DirentBcb;
USHORT EaHandle = 0;
BOOLEAN EaChange = FALSE;
PCCB Ccb;
ULONG NotifyFilter;
//
// The following variables are for abnormal termination
//
PCCB UnwindCcb = NULL;
USHORT UnwindEa = 0;
DebugTrace(+1, Dbg, "FatSupersedeOrOverwriteFile...\n", 0);
DirentBcb = NULL;
//
// We fail this operation if the caller doesn't understand Ea's.
//
if (NoEaKnowledge
&& EaLength > 0) {
Iosb.Status = STATUS_ACCESS_DENIED;
DebugTrace(-1, Dbg, "FatSupersedeOrOverwriteFile -> Iosb.Status = %08lx\n", Iosb.Status);
return Iosb;
}
try {
//
// Before we actually truncate, check to see if the purge
// is going to fail.
//
if (!MmCanFileBeTruncated( &Fcb->NonPaged->SectionObjectPointers,
&FatLargeZero )) {
try_return( Iosb.Status = STATUS_USER_MAPPED_FILE );
}
//
// Setup the context and section object pointers, and update
// our reference counts
//
FatSetFileObject( FileObject,
UserFileOpen,
Fcb,
Ccb = UnwindCcb = FatCreateCcb( IrpContext ));
FileObject->SectionObjectPointer = &Fcb->NonPaged->SectionObjectPointers;
//
// Since this is an supersede/overwrite, purge the section so
// that mappers will see zeros. We set the CREATE_IN_PROGRESS flag
// to prevent the Fcb from going away out from underneath us.
//
SetFlag(Fcb->Vcb->VcbState, VCB_STATE_FLAG_CREATE_IN_PROGRESS);
CcPurgeCacheSection( &Fcb->NonPaged->SectionObjectPointers, NULL, 0, FALSE );
//
// Tentatively add the new Ea's
//
if (EaLength > 0) {
FatCreateEa( IrpContext,
Fcb->Vcb,
(PUCHAR) EaBuffer,
EaLength,
&Fcb->ShortName.Name.Oem,
&EaHandle );
UnwindEa = EaHandle;
EaChange = TRUE;
}
//
// Now set the new allocation size, we do that by first
// zeroing out the current file size. Then we truncate and
// allocate up to the new allocation size
//
(VOID)ExAcquireResourceExclusive( Fcb->Header.PagingIoResource,
TRUE );
Fcb->Header.FileSize.LowPart = 0;
Fcb->Header.ValidDataLength.LowPart = 0;
Fcb->ValidDataToDisk = 0;
ExReleaseResource( Fcb->Header.PagingIoResource );
//
// Tell the cache manager the size went to zero
// This call is unconditional, because MM always wants to know.
//
CcSetFileSizes( FileObject,
(PCC_FILE_SIZES)&Fcb->Header.AllocationSize );
FatTruncateFileAllocation( IrpContext, Fcb, AllocationSize );
FatAddFileAllocation( IrpContext, Fcb, FileObject, AllocationSize );
Fcb->FcbState |= FCB_STATE_TRUNCATE_ON_CLOSE;
//
// Modify the attributes and time of the file, by first reading
// in the dirent for the file and then updating its attributes
// and time fields. Note that for supersede we replace the file
// attributes as opposed to adding to them.
//
FatGetDirentFromFcbOrDcb( IrpContext,
Fcb,
&Dirent,
&DirentBcb );
//
// Update the appropriate dirent fields, and the fcb fields
//
Dirent->FileSize = 0;
FileAttributes |= FILE_ATTRIBUTE_ARCHIVE;
if (CreateDisposition == FILE_SUPERSEDE) {
Dirent->Attributes = FileAttributes;
} else {
Dirent->Attributes |= FileAttributes;
}
Fcb->DirentFatFlags = Dirent->Attributes;
KeQuerySystemTime( &Fcb->LastWriteTime );
(VOID)FatNtTimeToFatTime( IrpContext,
&Fcb->LastWriteTime,
TRUE,
&Dirent->LastWriteTime,
NULL );
if (FatData.ChicagoMode) {
Dirent->LastAccessDate = Dirent->LastWriteTime.Date;
}
NotifyFilter = FILE_NOTIFY_CHANGE_LAST_WRITE
| FILE_NOTIFY_CHANGE_ATTRIBUTES
| FILE_NOTIFY_CHANGE_SIZE;
//
// And now delete the previous Ea set if there was one.
//
if (Dirent->ExtendedAttributes != 0) {
//
// **** SDK fix, we won't fail this if there is
// an error in the Ea's, we'll just leave
// the orphaned Ea's in the file.
//
EaChange = TRUE;
try {
FatDeleteEa( IrpContext,
Fcb->Vcb,
Dirent->ExtendedAttributes,
&Fcb->ShortName.Name.Oem );
} except( EXCEPTION_EXECUTE_HANDLER ) {
NOTHING;
}
}
//
// Update the extended attributes handle in the dirent.
//
if (EaChange) {
Dirent->ExtendedAttributes = EaHandle;
NotifyFilter |= FILE_NOTIFY_CHANGE_EA;
}
//
// Now update the dirent to the new ea handle and set the bcb dirty
// Once we do this we can no longer back out the Ea
//
FatSetDirtyBcb( IrpContext, DirentBcb, Fcb->Vcb );
UnwindEa = 0;
//
// Indicate that the Eas for this file have changed.
//
Ccb->EaModificationCount += Fcb->EaModificationCount;
//
// Check to see if we need to notify outstanding Irps for full
// changes only (i.e., we haven't added, deleted, or renamed the file).
//
FatNotifyReportChange( IrpContext,
Fcb->Vcb,
Fcb,
NotifyFilter,
FILE_ACTION_MODIFIED );
//
// And set our status to success
//
Iosb.Status = STATUS_SUCCESS;
if (CreateDisposition == FILE_SUPERSEDE) {
Iosb.Information = FILE_SUPERSEDED;
} else {
Iosb.Information = FILE_OVERWRITTEN;
}
try_exit: NOTHING;
} finally {
DebugUnwind( FatSupersedeOfOverwriteFile );
//
// If this is an abnormal termination then undo our work.
//
if (AbnormalTermination()) {
if (UnwindEa != 0) { FatDeleteEa( IrpContext, Fcb->Vcb, UnwindEa, &Fcb->ShortName.Name.Oem ); }
if (UnwindCcb != NULL) { FatDeleteCcb( IrpContext, UnwindCcb ); }
}
FatUnpinBcb( IrpContext, DirentBcb );
ClearFlag(Fcb->Vcb->VcbState, VCB_STATE_FLAG_CREATE_IN_PROGRESS);
DebugTrace(-1, Dbg, "FatSupersedeOrOverwriteFile -> Iosb.Status = %08lx\n", Iosb.Status);
}
UNREFERENCED_PARAMETER( ShareAccess );
UNREFERENCED_PARAMETER( DesiredAccess );
return Iosb;
}
//
// Internal support routine
//
VOID
FatSetFullNameInFcb(
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN PUNICODE_STRING FinalName
)
{
if (NodeType(Fcb->ParentDcb) == FAT_NTC_ROOT_DCB) {
Fcb->FullFileName.Length =
Fcb->FullFileName.MaximumLength = sizeof(WCHAR) + FinalName->Length;
Fcb->FullFileName.Buffer = FsRtlAllocatePool( PagedPool,
Fcb->FullFileName.Length );
Fcb->FullFileName.Buffer[0] = L'\\';
RtlCopyMemory( &Fcb->FullFileName.Buffer[1],
&FinalName->Buffer[0],
FinalName->Length );
} else {
PUNICODE_STRING Prefix;
Prefix = &Fcb->ParentDcb->FullFileName;
Fcb->FullFileName.Length =
Fcb->FullFileName.MaximumLength =
Prefix->Length + sizeof(WCHAR) + FinalName->Length;
Fcb->FullFileName.Buffer = FsRtlAllocatePool( PagedPool,
Fcb->FullFileName.Length );
RtlCopyMemory( &Fcb->FullFileName.Buffer[0],
&Prefix->Buffer[0],
Prefix->Length );
Fcb->FullFileName.Buffer[Prefix->Length / sizeof(WCHAR)] = L'\\';
RtlCopyMemory( &Fcb->FullFileName.Buffer[(Prefix->Length / sizeof(WCHAR)) + 1],
&FinalName->Buffer[0],
FinalName->Length );
}
}
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