/
create.c
6913 lines (4988 loc) · 205 KB
/
create.c
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/*++
Copyright (c) 1989-2000 Microsoft Corporation
Module Name:
Create.c
Abstract:
This module implements the File Create routine for Fat called by the
dispatch driver.
--*/
#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) { \
PFILE_SYSTEM_STATISTICS Stats = &(VCB)->Statistics[KeGetCurrentProcessorNumber() % FatData.NumberProcessors]; \
Stats->Fat.CreateHits += 1; \
}
#define CollectCreateStatistics(VCB,STATUS) { \
PFILE_SYSTEM_STATISTICS Stats = &(VCB)->Statistics[KeGetCurrentProcessorNumber() % FatData.NumberProcessors]; \
if ((STATUS) == STATUS_SUCCESS) { \
Stats->Fat.SuccessfulCreates += 1; \
} else { \
Stats->Fat.FailedCreates += 1; \
} \
}
LUID FatSecurityPrivilege = { SE_SECURITY_PRIVILEGE, 0 };
//
// local procedure prototypes
//
_Requires_lock_held_(_Global_critical_region_)
IO_STATUS_BLOCK
FatOpenVolume (
_In_ PIRP_CONTEXT IrpContext,
_Inout_ PFILE_OBJECT FileObject,
_Inout_ PVCB Vcb,
_In_ PACCESS_MASK DesiredAccess,
_In_ USHORT ShareAccess,
_In_ ULONG CreateDisposition
);
_Requires_lock_held_(_Global_critical_region_)
IO_STATUS_BLOCK
FatOpenRootDcb (
_In_ PIRP_CONTEXT IrpContext,
_Inout_ PFILE_OBJECT FileObject,
_Inout_ PVCB Vcb,
_In_ PACCESS_MASK DesiredAccess,
_In_ USHORT ShareAccess,
_In_ ULONG CreateDisposition
);
_Requires_lock_held_(_Global_critical_region_)
IO_STATUS_BLOCK
FatOpenExistingDcb (
_In_ PIRP_CONTEXT IrpContext,
_In_ PIO_STACK_LOCATION IrpSp,
_Inout_ PFILE_OBJECT FileObject,
_Inout_ PVCB Vcb,
_Inout_ PDCB Dcb,
_In_ PACCESS_MASK DesiredAccess,
_In_ USHORT ShareAccess,
_In_ ULONG CreateDisposition,
_In_ BOOLEAN NoEaKnowledge,
_In_ BOOLEAN DeleteOnClose,
_In_ BOOLEAN OpenRequiringOplock,
_In_ BOOLEAN FileNameOpenedDos,
_Out_ PBOOLEAN OplockPostIrp
);
_Requires_lock_held_(_Global_critical_region_)
IO_STATUS_BLOCK
FatOpenExistingFcb (
_In_ PIRP_CONTEXT IrpContext,
_In_ PIO_STACK_LOCATION IrpSp,
_Inout_ PFILE_OBJECT FileObject,
_Inout_ PVCB Vcb,
_Inout_ PFCB Fcb,
_In_ PACCESS_MASK DesiredAccess,
_In_ USHORT ShareAccess,
_In_ ULONG AllocationSize,
_In_ PFILE_FULL_EA_INFORMATION EaBuffer,
_In_ ULONG EaLength,
_In_ USHORT FileAttributes,
_In_ ULONG CreateDisposition,
_In_ BOOLEAN NoEaKnowledge,
_In_ BOOLEAN DeleteOnClose,
_In_ BOOLEAN OpenRequiringOplock,
_In_ BOOLEAN FileNameOpenedDos,
_Out_ PBOOLEAN OplockPostIrp
);
_Requires_lock_held_(_Global_critical_region_)
IO_STATUS_BLOCK
FatOpenTargetDirectory (
_In_ PIRP_CONTEXT IrpContext,
_Inout_ PFILE_OBJECT FileObject,
_Inout_ PDCB Dcb,
_In_ PACCESS_MASK DesiredAccess,
_In_ USHORT ShareAccess,
_In_ BOOLEAN DoesNameExist,
_In_ BOOLEAN FileNameOpenedDos
);
_Success_(return.Status == STATUS_SUCCESS)
_Requires_lock_held_(_Global_critical_region_)
IO_STATUS_BLOCK
FatOpenExistingDirectory (
_In_ PIRP_CONTEXT IrpContext,
_In_ PIO_STACK_LOCATION IrpSp,
_Inout_ PFILE_OBJECT FileObject,
_Inout_ PVCB Vcb,
_Outptr_result_maybenull_ PDCB *Dcb,
_In_ PDCB ParentDcb,
_In_ PDIRENT Dirent,
_In_ ULONG LfnByteOffset,
_In_ ULONG DirentByteOffset,
_In_ PUNICODE_STRING Lfn,
_In_ PACCESS_MASK DesiredAccess,
_In_ USHORT ShareAccess,
_In_ ULONG CreateDisposition,
_In_ BOOLEAN NoEaKnowledge,
_In_ BOOLEAN DeleteOnClose,
_In_ BOOLEAN FileNameOpenedDos,
_In_ BOOLEAN OpenRequiringOplock
);
_Requires_lock_held_(_Global_critical_region_)
IO_STATUS_BLOCK
FatOpenExistingFile (
_In_ PIRP_CONTEXT IrpContext,
_Inout_ PFILE_OBJECT FileObject,
_Inout_ PVCB Vcb,
_Outptr_result_maybenull_ PFCB *Fcb,
_In_ PDCB ParentDcb,
_In_ PDIRENT Dirent,
_In_ ULONG LfnByteOffset,
_In_ ULONG DirentByteOffset,
_In_ PUNICODE_STRING Lfn,
_In_ PUNICODE_STRING OrigLfn,
_In_ PACCESS_MASK DesiredAccess,
_In_ USHORT ShareAccess,
_In_ ULONG AllocationSize,
_In_ PFILE_FULL_EA_INFORMATION EaBuffer,
_In_ ULONG EaLength,
_In_ USHORT FileAttributes,
_In_ ULONG CreateDisposition,
_In_ BOOLEAN IsPagingFile,
_In_ BOOLEAN NoEaKnowledge,
_In_ BOOLEAN DeleteOnClose,
_In_ BOOLEAN OpenRequiringOplock,
_In_ BOOLEAN FileNameOpenedDos
);
_Requires_lock_held_(_Global_critical_region_)
IO_STATUS_BLOCK
FatCreateNewDirectory (
_In_ PIRP_CONTEXT IrpContext,
_In_ PIO_STACK_LOCATION IrpSp,
_Inout_ PFILE_OBJECT FileObject,
_Inout_ PVCB Vcb,
_Inout_ PDCB ParentDcb,
_In_ POEM_STRING OemName,
_In_ PUNICODE_STRING UnicodeName,
_In_ PACCESS_MASK DesiredAccess,
_In_ USHORT ShareAccess,
_In_ PFILE_FULL_EA_INFORMATION EaBuffer,
_In_ ULONG EaLength,
_In_ USHORT FileAttributes,
_In_ BOOLEAN NoEaKnowledge,
_In_ BOOLEAN DeleteOnClose,
_In_ BOOLEAN OpenRequiringOplock
);
_Requires_lock_held_(_Global_critical_region_)
IO_STATUS_BLOCK
FatCreateNewFile (
_In_ PIRP_CONTEXT IrpContext,
_In_ PIO_STACK_LOCATION IrpSp,
_Inout_ PFILE_OBJECT FileObject,
_Inout_ PVCB Vcb,
_Inout_ PDCB ParentDcb,
_In_ POEM_STRING OemName,
_In_ PUNICODE_STRING UnicodeName,
_In_ PACCESS_MASK DesiredAccess,
_In_ USHORT ShareAccess,
_In_ ULONG AllocationSize,
_In_ PFILE_FULL_EA_INFORMATION EaBuffer,
_In_ ULONG EaLength,
_In_ USHORT FileAttributes,
_In_ PUNICODE_STRING LfnBuffer,
_In_ BOOLEAN IsPagingFile,
_In_ BOOLEAN NoEaKnowledge,
_In_ BOOLEAN DeleteOnClose,
_In_ BOOLEAN OpenRequiringOplock,
_In_ BOOLEAN TemporaryFile
);
_Requires_lock_held_(_Global_critical_region_)
IO_STATUS_BLOCK
FatSupersedeOrOverwriteFile (
_In_ PIRP_CONTEXT IrpContext,
_Inout_ PFILE_OBJECT FileObject,
_Inout_ PFCB Fcb,
_In_ ULONG AllocationSize,
_In_ PFILE_FULL_EA_INFORMATION EaBuffer,
_In_ ULONG EaLength,
_In_ USHORT FileAttributes,
_In_ ULONG CreateDisposition,
_In_ BOOLEAN NoEaKnowledge
);
NTSTATUS
FatCheckSystemSecurityAccess (
_In_ PIRP_CONTEXT IrpContext
);
NTSTATUS
FatCheckShareAccess (
_In_ PIRP_CONTEXT IrpContext,
_In_ PFILE_OBJECT FileObject,
_In_ PFCB Fcb,
_In_ PACCESS_MASK DesiredAccess,
_In_ ULONG ShareAccess
);
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, FatCheckShareAccess)
#pragma alloc_text(PAGE, FatCheckSystemSecurityAccess)
#pragma alloc_text(PAGE, FatCommonCreate)
#if (NTDDI_VERSION >= NTDDI_WINTHRESHOLD)
#pragma alloc_text(PAGE, FatCommonCreateOnNewStack)
#pragma alloc_text(PAGE, FatCommonCreateCallout)
#endif
#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, FatSetFullNameInFcb)
#endif
_Function_class_(IRP_MJ_CREATE)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS
FatFsdCreate (
_In_ PVOLUME_DEVICE_OBJECT VolumeDeviceObject,
_Inout_ 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;
BOOLEAN ExceptionCompletedIrp = FALSE;
PAGED_CODE();
//
// If we were called with our file system device object instead of a
// volume device object, just complete this request with STATUS_SUCCESS
//
if ( FatDeviceIsFatFsdo( VolumeDeviceObject)) {
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 );
#if (NTDDI_VERSION >= NTDDI_WINTHRESHOLD)
Status = FatCommonCreateOnNewStack( IrpContext, Irp );
#else
Status = FatCommonCreate( IrpContext, Irp );
#endif
} 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() );
ExceptionCompletedIrp = TRUE;
}
if (TopLevel) { IoSetTopLevelIrp( NULL ); }
FsRtlExitFileSystem();
//
// Complete the request, unless we had an exception, in which case it
// was completed in FatProcessException (and the IrpContext freed).
//
// IrpContext is freed inside FatCompleteRequest.
//
if (!ExceptionCompletedIrp && Status != STATUS_PENDING) {
FatCompleteRequest( IrpContext, Irp, Status );
}
//
// And return to our caller
//
DebugTrace(-1, Dbg, "FatFsdCreate -> %08lx\n", Status );
TimerStop(Dbg,"FatFsdCreate");
UNREFERENCED_PARAMETER( VolumeDeviceObject );
return Status;
}
#if (NTDDI_VERSION >= NTDDI_WINTHRESHOLD)
_Requires_lock_held_(_Global_critical_region_)
VOID
FatCommonCreateCallout (
_In_ PFAT_CALLOUT_PARAMETERS CalloutParameters
)
/*++
Routine Description:
This function is the callout routine that will execute on a new stack when
processing a create. It simply calls FatCommonCreate() with the parameters
in the context and stores the return value in the context.
Arguments:
Context - Supplies an opaque pointer to this function's context. It is actually
an FAT_CALLOUT_PARAMETERS structure.
Return Value:
None.
--*/
{
PAGED_CODE();
//
// Call FatCommonCreate() with the passed parameters and store the result.
// Exceptions cannot be raised across stack boundaries, so we need to catch
// exceptions here and deal with them.
//
try {
CalloutParameters->IrpStatus = FatCommonCreate( CalloutParameters->Create.IrpContext,
CalloutParameters->Create.Irp );
} except (FatExceptionFilter( CalloutParameters->Create.IrpContext, GetExceptionInformation() )) {
//
// Return the resulting status.
//
CalloutParameters->ExceptionStatus = GetExceptionCode();
}
}
_Requires_lock_held_(_Global_critical_region_)
NTSTATUS
FatCommonCreateOnNewStack (
_In_ PIRP_CONTEXT IrpContext,
_In_ PIRP Irp
)
/*++
Routine Description:
This routine sets up a switch to a new stack and call to FatCommonCreate().
Arguments:
IrpContext - Supplies the context structure for the overall request.
Irp - Supplies the IRP being processed.
CreateContext - Supplies a pointer on the old stack that is used to
store context information for the create itself.
Return Value:
NTSTATUS - The status from FatCommonCreate().
--*/
{
FAT_CALLOUT_PARAMETERS CalloutParameters;
NTSTATUS status;
PAGED_CODE();
//
// Create requests consume a lot of stack space. As such, we always switch to a
// new stack when processing a create. Setup the callout parameters and make the
// call. Note that this cannot fail, since we pass a stack context for a reserve stack.
//
CalloutParameters.Create.IrpContext = IrpContext;
CalloutParameters.Create.Irp = Irp;
CalloutParameters.ExceptionStatus = CalloutParameters.IrpStatus = STATUS_SUCCESS;
//
// Mark that we are swapping the stack
//
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_SWAPPED_STACK );
status = KeExpandKernelStackAndCalloutEx( FatCommonCreateCallout,
&CalloutParameters,
KERNEL_STACK_SIZE,
FALSE,
NULL );
//
// Mark that the stack is no longer swapped. Note that there are paths
// that may clear this flag before returning.
//
if (status != STATUS_PENDING) {
ClearFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_SWAPPED_STACK );
}
//
// If we had an exception occur, re-raise the exception.
//
if (!NT_SUCCESS( CalloutParameters.ExceptionStatus )) {
FatRaiseStatus( IrpContext, CalloutParameters.ExceptionStatus );
}
//
// If the call to KeExpandKernelStackAndCalloutEx returns an error this
// means that the callout routine (FatCommonCreateCallout) was never
// called. Translate that error, and return it.
//
if (!NT_SUCCESS( status )) {
//
// Translate to an expected error value
//
if (status == STATUS_NO_MEMORY) {
status = STATUS_INSUFFICIENT_RESOURCES;
}
return status;
}
//
// Return the status given to us by the callout.
//
return CalloutParameters.IrpStatus;
}
#endif
_Requires_lock_held_(_Global_critical_region_)
NTSTATUS
FatCommonCreate (
_Inout_ PIRP_CONTEXT IrpContext,
_Inout_ 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 = {0};
PIO_STACK_LOCATION IrpSp;
PFILE_OBJECT FileObject;
PFILE_OBJECT RelatedFileObject;
UNICODE_STRING FileName;
ULONG AllocationSize;
PFILE_FULL_EA_INFORMATION EaBuffer;
PACCESS_MASK DesiredAccess;
ULONG Options;
USHORT FileAttributes;
USHORT ShareAccess;
ULONG EaLength;
BOOLEAN CreateDirectory;
BOOLEAN NoIntermediateBuffering;
BOOLEAN OpenDirectory;
BOOLEAN IsPagingFile;
BOOLEAN OpenTargetDirectory;
BOOLEAN DirectoryFile;
BOOLEAN NonDirectoryFile;
BOOLEAN NoEaKnowledge;
BOOLEAN DeleteOnClose;
BOOLEAN OpenRequiringOplock;
BOOLEAN TemporaryFile;
BOOLEAN FileNameOpenedDos = FALSE;
ULONG CreateDisposition;
PVCB Vcb;
PFCB Fcb = NULL;
PCCB Ccb;
PDCB ParentDcb;
PDCB FinalDcb = NULL;
UNICODE_STRING FinalName = {0};
UNICODE_STRING RemainingPart;
UNICODE_STRING NextRemainingPart = {0};
UNICODE_STRING UpcasedFinalName;
WCHAR UpcasedBuffer[ FAT_CREATE_INITIAL_NAME_BUF_SIZE];
OEM_STRING OemFinalName;
UCHAR OemBuffer[ FAT_CREATE_INITIAL_NAME_BUF_SIZE*2];
PDIRENT Dirent;
PBCB DirentBcb = NULL;
ULONG LfnByteOffset;
ULONG DirentByteOffset;
BOOLEAN PostIrp = FALSE;
BOOLEAN OplockPostIrp = FALSE;
BOOLEAN TrailingBackslash;
BOOLEAN FirstLoop = TRUE;
ULONG MatchFlags = 0;
CCB LocalCcb;
UNICODE_STRING Lfn;
UNICODE_STRING OrigLfn = {0};
WCHAR LfnBuffer[ FAT_CREATE_INITIAL_NAME_BUF_SIZE];
PAGED_CODE();
//
// Get the current IRP stack location
//
IrpSp = IoGetCurrentIrpStackLocation( Irp );
DebugTrace(+1, Dbg, "FatCommonCreate\n", 0 );
DebugTrace( 0, Dbg, "Irp = %p\n", Irp );
DebugTrace( 0, Dbg, "->Flags = %08lx\n", Irp->Flags );
DebugTrace( 0, Dbg, "->FileObject = %p\n", IrpSp->FileObject );
DebugTrace( 0, Dbg, " ->RelatedFileObject = %p\n", IrpSp->FileObject->RelatedFileObject );
DebugTrace( 0, Dbg, " ->FileName = %wZ\n", &IrpSp->FileObject->FileName );
DebugTrace( 0, Dbg, " ->FileName.Length = 0n%d\n", IrpSp->FileObject->FileName.Length );
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 = %p\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 );
//
// This is here because the Win32 layer can't avoid sending me double
// beginning backslashes.
//
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'\\')) {
DebugTrace(-1, Dbg, "FatCommonCreate -> STATUS_OBJECT_NAME_INVALID\n", 0);
return STATUS_OBJECT_NAME_INVALID;
}
}
//
// Reference our input parameters to make things easier
//
NT_ASSERT( IrpSp->Parameters.Create.SecurityContext != NULL );
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 = 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;
}
//
// 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: 2/16/95
//
FileAttributes &= (FILE_ATTRIBUTE_READONLY |
FILE_ATTRIBUTE_HIDDEN |
FILE_ATTRIBUTE_SYSTEM |
FILE_ATTRIBUTE_ARCHIVE |
FILE_ATTRIBUTE_ENCRYPTED);
//
// Locate the volume device object and Vcb that we are trying to access
//
Vcb = &((PVOLUME_DEVICE_OBJECT)IrpSp->DeviceObject)->Vcb;
//
// Decipher Option flags and values
//
//
// If this is an open by fileid operation, just fail it explicitly. FAT's
// source of fileids is not reversible for open operations.
//
if (BooleanFlagOn( Options, FILE_OPEN_BY_FILE_ID )) {
return STATUS_NOT_IMPLEMENTED;
}
DirectoryFile = BooleanFlagOn( Options, FILE_DIRECTORY_FILE );
NonDirectoryFile = BooleanFlagOn( Options, FILE_NON_DIRECTORY_FILE );
NoIntermediateBuffering = BooleanFlagOn( Options, FILE_NO_INTERMEDIATE_BUFFERING );
NoEaKnowledge = BooleanFlagOn( Options, FILE_NO_EA_KNOWLEDGE );
DeleteOnClose = BooleanFlagOn( Options, FILE_DELETE_ON_CLOSE );
#if (NTDDI_VERSION >= NTDDI_WIN7)
OpenRequiringOplock = BooleanFlagOn( Options, FILE_OPEN_REQUIRING_OPLOCK );
#else
OpenRequiringOplock = FALSE;
#endif
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)));
//
// Make sure the input large integer is valid and that the dir/nondir
// indicates a storage type we understand.
//
if (Irp->Overlay.AllocationSize.HighPart != 0 ||
(DirectoryFile && NonDirectoryFile)) {
DebugTrace(-1, Dbg, "FatCommonCreate -> STATUS_INVALID_PARAMETER\n", 0);
return STATUS_INVALID_PARAMETER;
}
//
// 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;
}
//
// Make sure we haven't been called recursively by a filter inside an existing
// create request.
//
if (FlagOn( Vcb->VcbState, VCB_STATE_FLAG_CREATE_IN_PROGRESS)) {
#pragma prefast( suppress:28159, "this is a serious programming error if it happens" )
FatBugCheck( 0, 0, 0);
}
//
// Initialize the DirentBcb to null
//
DirentBcb = NULL;
//
// Initialize our temp strings with their stack buffers.
//
OemFinalName.Length = 0;
OemFinalName.MaximumLength = sizeof( OemBuffer);
OemFinalName.Buffer = (PCHAR)OemBuffer;
UpcasedFinalName.Length = 0;
UpcasedFinalName.MaximumLength = sizeof( UpcasedBuffer);
UpcasedFinalName.Buffer = UpcasedBuffer;
Lfn.Length = 0;
Lfn.MaximumLength = sizeof( LfnBuffer);
Lfn.Buffer = LfnBuffer;
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);
Status = STATUS_ACCESS_DENIED;
if (Vcb->VcbCondition != VcbGood) {
Status = STATUS_VOLUME_DISMOUNTED;
}
try_return( Iosb.Status = Status );
}
//
// Don't allow the DELETE_ON_CLOSE option if the volume is
// write-protected.
//
if (DeleteOnClose && 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 );
}
//
// If this is a fat32 volume, EA's are not supported.
//
if (EaBuffer != NULL) {
try_return( Iosb.Status = STATUS_EAS_NOT_SUPPORTED );
}
//
// 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) {
PVCB DecodeVcb = NULL;
if (RelatedFileObject == NULL ||
FatDecodeFileObject( RelatedFileObject,
&DecodeVcb,
&Fcb,
&Ccb ) == UserVolumeOpen) {
NT_ASSERT( RelatedFileObject == NULL || Vcb == DecodeVcb );
//
// 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 = %p\n", Vcb);
CollectCreateHitStatistics(Vcb);
Iosb = FatOpenVolume( IrpContext,
FileObject,
Vcb,
DesiredAccess,
ShareAccess,
CreateDisposition );
Irp->IoStatus.Information = Iosb.Information;
try_return( Iosb.Status );
}
}
//
// 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 );
}
//
// A relative open must be via a relative path.
//
if (FileName.Length != 0 &&
FileName.Buffer[0] == L'\\') {
try_return( Iosb.Status = STATUS_OBJECT_NAME_INVALID );
}
//
// Set up the file object's Vpb pointer in case anything happens.
//
NT_ASSERT( Vcb == RelatedVcb );
FileObject->Vpb = RelatedFileObject->Vpb;
//
// Now verify the related Fcb so we don't get in trouble later
// by assuming its in good shape.
//
FatVerifyFcb( IrpContext, RelatedDcb );
ParentDcb = RelatedDcb;