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windows-nt/Source/XPSP1/NT/base/fs/udfs/fileinfo.c

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/*++
Copyright (c) 1989-2000 Microsoft Corporation
Module Name:
FileInfo.c
Abstract:
This module implements the File Information routines for Udfs called by
the Fsd/Fsp dispatch drivers.
// @@BEGIN_DDKSPLIT
Author:
Dan Lovinger [DanLo] 16-Jan-1997
Revision History:
// @@END_DDKSPLIT
--*/
#include "UdfProcs.h"
//
// The Bug check file id for this module
//
#define BugCheckFileId (UDFS_BUG_CHECK_FILEINFO)
//
// The local debug trace level
//
#define Dbg (UDFS_DEBUG_LEVEL_FILEINFO)
//
// Local macros
//
INLINE
ULONG
UdfGetExtraFileAttributes (
IN PCCB Ccb
)
/*++
Routine Description:
Safely figure out extra name-based file attributes given a context block.
Arguments:
Ccb - a context block to examine.
Return Value:
ULONG - file attributes for a file based on how it was opened (seperate from
those based on the object that was opened).
--*/
{
return ( Ccb->Lcb != NULL? Ccb->Lcb->FileAttributes : 0 );
}
//
// Local support routines
//
VOID
UdfQueryBasicInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN PCCB Ccb,
IN OUT PFILE_BASIC_INFORMATION Buffer,
IN OUT PULONG Length
);
VOID
UdfQueryStandardInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN OUT PFILE_STANDARD_INFORMATION Buffer,
IN OUT PULONG Length
);
VOID
UdfQueryInternalInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN OUT PFILE_INTERNAL_INFORMATION Buffer,
IN OUT PULONG Length
);
VOID
UdfQueryEaInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN OUT PFILE_EA_INFORMATION Buffer,
IN OUT PULONG Length
);
VOID
UdfQueryPositionInfo (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN OUT PFILE_POSITION_INFORMATION Buffer,
IN OUT PULONG Length
);
NTSTATUS
UdfQueryNameInfo (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN OUT PFILE_NAME_INFORMATION Buffer,
IN OUT PULONG Length
);
NTSTATUS
UdfQueryAlternateNameInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN PCCB Ccb,
IN OUT PFILE_NAME_INFORMATION Buffer,
IN OUT PULONG Length
);
VOID
UdfQueryNetworkInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN PCCB Ccb,
IN OUT PFILE_NETWORK_OPEN_INFORMATION Buffer,
IN OUT PULONG Length
);
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, UdfCommonQueryInfo)
#pragma alloc_text(PAGE, UdfCommonSetInfo)
#pragma alloc_text(PAGE, UdfFastQueryBasicInfo)
#pragma alloc_text(PAGE, UdfFastQueryStdInfo)
#pragma alloc_text(PAGE, UdfFastQueryNetworkInfo)
#pragma alloc_text(PAGE, UdfQueryAlternateNameInfo)
#pragma alloc_text(PAGE, UdfQueryBasicInfo)
#pragma alloc_text(PAGE, UdfQueryEaInfo)
#pragma alloc_text(PAGE, UdfQueryInternalInfo)
#pragma alloc_text(PAGE, UdfQueryNameInfo)
#pragma alloc_text(PAGE, UdfQueryNetworkInfo)
#pragma alloc_text(PAGE, UdfQueryPositionInfo)
#pragma alloc_text(PAGE, UdfQueryStandardInfo)
#endif
NTSTATUS
UdfCommonQueryInfo (
IN PIRP_CONTEXT IrpContext,
IN PIRP Irp
)
/*++
Routine Description:
This is the common routine for query file information called by both the
fsd and fsp threads.
Arguments:
Irp - Supplies the Irp to process.
Return Value:
NTSTATUS - The return status for this operation.
--*/
{
NTSTATUS Status = STATUS_SUCCESS;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
ULONG Length;
FILE_INFORMATION_CLASS FileInformationClass;
PFILE_ALL_INFORMATION Buffer;
TYPE_OF_OPEN TypeOfOpen;
PFCB Fcb;
PCCB Ccb;
BOOLEAN ReleaseFcb = FALSE;
PAGED_CODE();
//
// Reference our input parameters to make things easier
//
Length = IrpSp->Parameters.QueryFile.Length;
FileInformationClass = IrpSp->Parameters.QueryFile.FileInformationClass;
Buffer = Irp->AssociatedIrp.SystemBuffer;
//
// Decode the file object
//
TypeOfOpen = UdfDecodeFileObject( IrpSp->FileObject, &Fcb, &Ccb );
//
// Use a try-finally to facilitate cleanup.
//
try {
//
// We only support query on file and directory handles.
//
switch (TypeOfOpen) {
case UserDirectoryOpen :
case UserFileOpen :
//
// Acquire shared access to this file. NOTE that this could be
// a recursive acquire, if we already preacquired in
// UdfAcquireForCreateSection().
//
UdfAcquireFileShared( IrpContext, Fcb );
ReleaseFcb = TRUE;
ASSERT( FlagOn( Fcb->FcbState, FCB_STATE_INITIALIZED ));
//
// Make sure the Fcb is in a usable condition. This will raise
// an error condition if the volume is unusable
//
UdfVerifyFcbOperation( IrpContext, Fcb );
//
// Based on the information class we'll do different
// actions. Each of hte procedures that we're calling fills
// up the output buffer, if possible. They will raise the
// status STATUS_BUFFER_OVERFLOW for an insufficient buffer.
// This is considered a somewhat unusual case and is handled
// more cleanly with the exception mechanism rather than
// testing a return status value for each call.
//
switch (FileInformationClass) {
case FileAllInformation:
//
// We don't allow this operation on a file opened by file Id.
//
if (FlagOn( Ccb->Flags, CCB_FLAG_OPEN_BY_ID )) {
Status = STATUS_INVALID_PARAMETER;
break;
}
//
// In this case go ahead and call the individual routines to
// fill in the buffer. Only the name routine will
// pointer to the output buffer and then call the
// individual routines to fill in the buffer.
//
Length -= (sizeof( FILE_ACCESS_INFORMATION ) +
sizeof( FILE_MODE_INFORMATION ) +
sizeof( FILE_ALIGNMENT_INFORMATION ));
UdfQueryBasicInfo( IrpContext, Fcb, Ccb, &Buffer->BasicInformation, &Length );
UdfQueryStandardInfo( IrpContext, Fcb, &Buffer->StandardInformation, &Length );
UdfQueryInternalInfo( IrpContext, Fcb, &Buffer->InternalInformation, &Length );
UdfQueryEaInfo( IrpContext, Fcb, &Buffer->EaInformation, &Length );
UdfQueryPositionInfo( IrpContext, IrpSp->FileObject, &Buffer->PositionInformation, &Length );
Status = UdfQueryNameInfo( IrpContext, IrpSp->FileObject, &Buffer->NameInformation, &Length );
break;
case FileBasicInformation:
UdfQueryBasicInfo( IrpContext, Fcb, Ccb, (PFILE_BASIC_INFORMATION) Buffer, &Length );
break;
case FileStandardInformation:
UdfQueryStandardInfo( IrpContext, Fcb, (PFILE_STANDARD_INFORMATION) Buffer, &Length );
break;
case FileInternalInformation:
UdfQueryInternalInfo( IrpContext, Fcb, (PFILE_INTERNAL_INFORMATION) Buffer, &Length );
break;
case FileEaInformation:
UdfQueryEaInfo( IrpContext, Fcb, (PFILE_EA_INFORMATION) Buffer, &Length );
break;
case FilePositionInformation:
UdfQueryPositionInfo( IrpContext, IrpSp->FileObject, (PFILE_POSITION_INFORMATION) Buffer, &Length );
break;
case FileNameInformation:
//
// We don't allow this operation on a file opened by file Id.
//
if (!FlagOn( Ccb->Flags, CCB_FLAG_OPEN_BY_ID )) {
Status = UdfQueryNameInfo( IrpContext, IrpSp->FileObject, (PFILE_NAME_INFORMATION) Buffer, &Length );
} else {
Status = STATUS_INVALID_PARAMETER;
}
break;
case FileAlternateNameInformation:
if (!FlagOn( Ccb->Flags, CCB_FLAG_OPEN_BY_ID )) {
Status = UdfQueryAlternateNameInfo( IrpContext, Fcb, Ccb, (PFILE_NAME_INFORMATION) Buffer, &Length );
} else {
Status = STATUS_INVALID_PARAMETER;
}
break;
case FileNetworkOpenInformation:
UdfQueryNetworkInfo( IrpContext, Fcb, Ccb, (PFILE_NETWORK_OPEN_INFORMATION) Buffer, &Length );
break;
default :
Status = STATUS_INVALID_PARAMETER;
}
break;
default :
Status = STATUS_INVALID_PARAMETER;
}
//
// Set the information field to the number of bytes actually filled in
// and then complete the request
//
Irp->IoStatus.Information = IrpSp->Parameters.QueryFile.Length - Length;
} finally {
//
// Release the file.
//
if (ReleaseFcb) {
UdfReleaseFile( IrpContext, Fcb );
}
}
//
// Complete the request if we didn't raise.
//
UdfCompleteRequest( IrpContext, Irp, Status );
return Status;
}
NTSTATUS
UdfCommonSetInfo (
IN PIRP_CONTEXT IrpContext,
IN PIRP Irp
)
/*++
Routine Description:
This is the common routine for set file information called by both the
fsd and fsp threads. We only support operations which set the file position.
Arguments:
Irp - Supplies the Irp to process.
Return Value:
NTSTATUS - The return status for this operation.
--*/
{
NTSTATUS Status = STATUS_INVALID_PARAMETER;
TYPE_OF_OPEN TypeOfOpen;
PFCB Fcb;
PCCB Ccb;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
PFILE_POSITION_INFORMATION Buffer;
PAGED_CODE();
//
// Decode the file object
//
TypeOfOpen = UdfDecodeFileObject( IrpSp->FileObject, &Fcb, &Ccb );
//
// We only support a SetPositionInformation on a user file.
//
if ((TypeOfOpen != UserFileOpen) ||
(IrpSp->Parameters.QueryFile.FileInformationClass != FilePositionInformation)) {
UdfCompleteRequest( IrpContext, Irp, Status );
return Status;
}
//
// Acquire shared access to this file.
//
UdfAcquireFileShared( IrpContext, Fcb );
try {
//
// Make sure the Fcb is in a usable condition. This
// will raise an error condition if the fcb is unusable
//
UdfVerifyFcbOperation( IrpContext, Fcb );
Buffer = Irp->AssociatedIrp.SystemBuffer;
//
// Check if the file does not use intermediate buffering. If it
// does not use intermediate buffering then the new position we're
// supplied must be aligned properly for the device
//
if (FlagOn( IrpSp->FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING ) &&
((Buffer->CurrentByteOffset.LowPart & IrpSp->DeviceObject->AlignmentRequirement) != 0)) {
try_leave( NOTHING );
}
//
// The input parameter is fine so set the current byte offset and
// complete the request
//
//
// Lock the Fcb to provide synchronization.
//
UdfLockFcb( IrpContext, Fcb );
IrpSp->FileObject->CurrentByteOffset = Buffer->CurrentByteOffset;
UdfUnlockFcb( IrpContext, Fcb );
Status = STATUS_SUCCESS;
} finally {
UdfReleaseFile( IrpContext, Fcb );
}
//
// Complete the request if there was no raise.
//
UdfCompleteRequest( IrpContext, Irp, Status );
return Status;
}
BOOLEAN
UdfFastQueryBasicInfo (
IN PFILE_OBJECT FileObject,
IN BOOLEAN Wait,
IN OUT PFILE_BASIC_INFORMATION Buffer,
OUT PIO_STATUS_BLOCK IoStatus,
IN PDEVICE_OBJECT DeviceObject
)
/*++
Routine Description:
This routine is for the fast query call for basic file information.
Arguments:
FileObject - Supplies the file object used in this operation
Wait - Indicates if we are allowed to wait for the information
Buffer - Supplies the output buffer to receive the basic information
IoStatus - Receives the final status of the operation
Return Value:
BOOLEAN - TRUE if the operation succeeded and FALSE if the caller
needs to take the long route.
--*/
{
BOOLEAN Result = FALSE;
TYPE_OF_OPEN TypeOfOpen;
PFCB Fcb;
PCCB Ccb;
PAGED_CODE();
ASSERT_FILE_OBJECT( FileObject );
FsRtlEnterFileSystem();
//
// Decode the file object to find the type of open and the data
// structures.
//
TypeOfOpen = UdfDecodeFileObject( FileObject, &Fcb, &Ccb );
//
// We only support this request on user file or directory objects.
//
ASSERT( FlagOn( Fcb->FcbState, FCB_STATE_INITIALIZED ));
if (TypeOfOpen != UserFileOpen && TypeOfOpen != UserDirectoryOpen) {
FsRtlExitFileSystem();
return FALSE;
}
//
// Acquire the file shared to access the Fcb.
//
if (!ExAcquireResourceSharedLite( Fcb->Resource, Wait )) {
FsRtlExitFileSystem();
return FALSE;
}
//
// Use a try-finally to facilitate cleanup.
//
try {
//
// Only deal with 'good' Fcb's.
//
if (UdfVerifyFcbOperation( NULL, Fcb )) {
//
// Fill in the input buffer from the Fcb fields.
//
Buffer->CreationTime = Fcb->Timestamps.CreationTime;
Buffer->LastWriteTime =
Buffer->ChangeTime = Fcb->Timestamps.ModificationTime;
Buffer->LastAccessTime = Fcb->Timestamps.AccessTime;
Buffer->FileAttributes = Fcb->FileAttributes | UdfGetExtraFileAttributes( Ccb );
//
// Update the IoStatus block with the size of this data.
//
IoStatus->Status = STATUS_SUCCESS;
IoStatus->Information = sizeof( FILE_BASIC_INFORMATION );
Result = TRUE;
}
} finally {
ExReleaseResourceLite( Fcb->Resource );
FsRtlExitFileSystem();
}
return Result;
}
BOOLEAN
UdfFastQueryStdInfo (
IN PFILE_OBJECT FileObject,
IN BOOLEAN Wait,
IN OUT PFILE_STANDARD_INFORMATION Buffer,
OUT PIO_STATUS_BLOCK IoStatus,
IN PDEVICE_OBJECT DeviceObject
)
/*++
Routine Description:
This routine is for the fast query call for standard file information.
Arguments:
FileObject - Supplies the file object used in this operation
Wait - Indicates if we are allowed to wait for the information
Buffer - Supplies the output buffer to receive the basic information
IoStatus - Receives the final status of the operation
Return Value:
BOOLEAN - TRUE if the operation succeeded and FALSE if the caller
needs to take the long route.
--*/
{
BOOLEAN Result = FALSE;
TYPE_OF_OPEN TypeOfOpen;
PFCB Fcb;
PAGED_CODE();
ASSERT_FILE_OBJECT( FileObject );
FsRtlEnterFileSystem();
//
// Decode the file object to find the type of open and the data
// structures.
//
TypeOfOpen = UdfFastDecodeFileObject( FileObject, &Fcb );
//
// We only support this request on initialized user file or directory objects.
//
if (TypeOfOpen != UserFileOpen && TypeOfOpen != UserDirectoryOpen) {
FsRtlExitFileSystem();
return FALSE;
}
//
// Acquire the file shared to access the Fcb.
//
if (!ExAcquireResourceSharedLite( Fcb->Resource, Wait )) {
FsRtlExitFileSystem();
return FALSE;
}
//
// Use a try-finally to facilitate cleanup.
//
try {
//
// Only deal with 'good' Fcb's.
//
if (UdfVerifyFcbOperation( NULL, Fcb )) {
//
// Check whether this is a directory.
//
if (FlagOn( Fcb->FileAttributes, FILE_ATTRIBUTE_DIRECTORY )) {
Buffer->AllocationSize.QuadPart =
Buffer->EndOfFile.QuadPart = 0;
Buffer->Directory = TRUE;
} else {
Buffer->AllocationSize.QuadPart = Fcb->AllocationSize.QuadPart;
Buffer->EndOfFile.QuadPart = Fcb->FileSize.QuadPart;
Buffer->Directory = FALSE;
}
Buffer->NumberOfLinks = Fcb->LinkCount;
Buffer->DeletePending = FALSE;
//
// Update the IoStatus block with the size of this data.
//
IoStatus->Status = STATUS_SUCCESS;
IoStatus->Information = sizeof( FILE_STANDARD_INFORMATION );
Result = TRUE;
}
} finally {
ExReleaseResourceLite( Fcb->Resource );
FsRtlExitFileSystem();
}
return Result;
}
BOOLEAN
UdfFastQueryNetworkInfo (
IN PFILE_OBJECT FileObject,
IN BOOLEAN Wait,
OUT PFILE_NETWORK_OPEN_INFORMATION Buffer,
OUT PIO_STATUS_BLOCK IoStatus,
IN PDEVICE_OBJECT DeviceObject
)
/*++
Routine Description:
This routine is for the fast query call for network file information.
Arguments:
FileObject - Supplies the file object used in this operation
Wait - Indicates if we are allowed to wait for the information
Buffer - Supplies the output buffer to receive the basic information
IoStatus - Receives the final status of the operation
Return Value:
BOOLEAN - TRUE if the operation succeeded and FALSE if the caller
needs to take the long route.
--*/
{
BOOLEAN Result = FALSE;
TYPE_OF_OPEN TypeOfOpen;
PFCB Fcb;
PCCB Ccb;
PAGED_CODE();
ASSERT_FILE_OBJECT( FileObject );
FsRtlEnterFileSystem();
//
// Decode the file object to find the type of open and the data
// structures.
//
TypeOfOpen = UdfDecodeFileObject( FileObject, &Fcb, &Ccb );
//
// We only support this request on user file or directory objects.
//
if (TypeOfOpen != UserFileOpen && TypeOfOpen != UserDirectoryOpen) {
FsRtlExitFileSystem();
return FALSE;
}
//
// Acquire the file shared to access the Fcb.
//
if (!ExAcquireResourceSharedLite( Fcb->Resource, Wait )) {
FsRtlExitFileSystem();
return FALSE;
}
//
// Use a try-finally to facilitate cleanup.
//
try {
//
// Only deal with 'good' Fcb's.
//
if (UdfVerifyFcbOperation( NULL, Fcb )) {
//
// Fill in the input buffer from the Fcb fields.
//
Buffer->CreationTime = Fcb->Timestamps.CreationTime;
Buffer->LastWriteTime =
Buffer->ChangeTime = Fcb->Timestamps.ModificationTime;
Buffer->LastAccessTime = Fcb->Timestamps.AccessTime;
Buffer->FileAttributes = Fcb->FileAttributes | UdfGetExtraFileAttributes( Ccb );
//
// Check whether this is a directory.
//
if (FlagOn( Fcb->FileAttributes, FILE_ATTRIBUTE_DIRECTORY )) {
Buffer->AllocationSize.QuadPart =
Buffer->EndOfFile.QuadPart = 0;
} else {
Buffer->AllocationSize.QuadPart = Fcb->AllocationSize.QuadPart;
Buffer->EndOfFile.QuadPart = Fcb->FileSize.QuadPart;
}
//
// Update the IoStatus block with the size of this data.
//
IoStatus->Status = STATUS_SUCCESS;
IoStatus->Information = sizeof( FILE_NETWORK_OPEN_INFORMATION );
Result = TRUE;
}
} finally {
ExReleaseResourceLite( Fcb->Resource );
FsRtlExitFileSystem();
}
return Result;
}
//
// Local support routine
//
VOID
UdfQueryBasicInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN PCCB Ccb,
IN OUT PFILE_BASIC_INFORMATION Buffer,
IN OUT PULONG Length
)
/*++
Description:
This routine performs the query basic information function for Udfs
Arguments:
Fcb - Supplies the Fcb being queried, it has been verified
Ccb - Supplies the Ccb associated with the fileobject being queried
Buffer - Supplies a pointer to the buffer where the information is to
be returned
Length - Supplies the length of the buffer in bytes, and receives the
remaining bytes free in the buffer upon return.
Return Value:
None
--*/
{
PAGED_CODE();
//
// We support all times on Udfs.
//
Buffer->CreationTime = Fcb->Timestamps.CreationTime;
Buffer->LastWriteTime =
Buffer->ChangeTime = Fcb->Timestamps.ModificationTime;
Buffer->LastAccessTime = Fcb->Timestamps.AccessTime;
Buffer->FileAttributes = Fcb->FileAttributes | UdfGetExtraFileAttributes( Ccb );
//
// Update the length and status output variables
//
*Length -= sizeof( FILE_BASIC_INFORMATION );
return;
}
//
// Local support routine
//
VOID
UdfQueryStandardInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN OUT PFILE_STANDARD_INFORMATION Buffer,
IN OUT PULONG Length
)
/*++
Routine Description:
This routine performs the query standard information function for Udfs.
Arguments:
Fcb - Supplies the Fcb being queried, it has been verified
Buffer - Supplies a pointer to the buffer where the information is to
be returned
Length - Supplies the length of the buffer in bytes, and receives the
remaining bytes free in the buffer upon return.
Return Value:
None
--*/
{
PAGED_CODE();
//
// Delete is never pending on a readonly file.
//
Buffer->NumberOfLinks = Fcb->LinkCount;
Buffer->DeletePending = FALSE;
//
// We get the sizes from the header. Return a size of zero
// for all directories.
//
if (FlagOn( Fcb->FileAttributes, FILE_ATTRIBUTE_DIRECTORY )) {
Buffer->AllocationSize.QuadPart =
Buffer->EndOfFile.QuadPart = 0;
Buffer->Directory = TRUE;
} else {
Buffer->AllocationSize.QuadPart = Fcb->AllocationSize.QuadPart;
Buffer->EndOfFile.QuadPart = Fcb->FileSize.QuadPart;
Buffer->Directory = FALSE;
}
//
// Update the length and status output variables
//
*Length -= sizeof( FILE_STANDARD_INFORMATION );
return;
}
//
// Local support routine
//
VOID
UdfQueryInternalInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN OUT PFILE_INTERNAL_INFORMATION Buffer,
IN OUT PULONG Length
)
/*++
Routine Description:
This routine performs the query internal information function for Udfs.
Arguments:
Fcb - Supplies the Fcb being queried, it has been verified
Buffer - Supplies a pointer to the buffer where the information is to
be returned
Length - Supplies the length of the buffer in bytes, and receives the
remaining bytes free in the buffer upon return.
Return Value:
None
--*/
{
PAGED_CODE();
//
// Index number is the file Id number in the Fcb.
//
Buffer->IndexNumber = Fcb->FileId;
*Length -= sizeof( FILE_INTERNAL_INFORMATION );
return;
}
//
// Local support routine
//
VOID
UdfQueryEaInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN OUT PFILE_EA_INFORMATION Buffer,
IN OUT PULONG Length
)
/*++
Routine Description:
This routine performs the query Ea information function for Udfs.
Arguments:
Fcb - Supplies the Fcb being queried, it has been verified
Buffer - Supplies a pointer to the buffer where the information is to
be returned
Length - Supplies the length of the buffer in bytes, and receives the
remaining bytes free in the buffer upon return.
Return Value:
None
--*/
{
PAGED_CODE();
//
// No Ea's on Udfs volumes. At least not that our EA support would understand.
//
Buffer->EaSize = 0;
*Length -= sizeof( FILE_EA_INFORMATION );
return;
}
//
// Local support routine
//
VOID
UdfQueryPositionInfo (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN OUT PFILE_POSITION_INFORMATION Buffer,
IN OUT PULONG Length
)
/*++
Routine Description:
This routine performs the query position information function for Udfs.
Arguments:
FileObject - Supplies the File object being queried
Buffer - Supplies a pointer to the buffer where the information is to
be returned
Length - Supplies the length of the buffer in bytes, and receives the
remaining bytes free in the buffer upon return.
Return Value:
None
--*/
{
PAGED_CODE();
//
// Get the current position found in the file object.
//
Buffer->CurrentByteOffset = FileObject->CurrentByteOffset;
//
// Update the length and status output variables
//
*Length -= sizeof( FILE_POSITION_INFORMATION );
return;
}
//
// Local support routine
//
NTSTATUS
UdfQueryNameInfo (
IN PIRP_CONTEXT IrpContext,
IN PFILE_OBJECT FileObject,
IN OUT PFILE_NAME_INFORMATION Buffer,
IN OUT PULONG Length
)
/*++
Routine Description:
This routine performs the query name information function for Udfs.
Arguments:
FileObject - Supplies the file object containing the name.
Buffer - Supplies a pointer to the buffer where the information is to
be returned
Length - Supplies the length of the buffer in bytes, and receives the
remaining bytes free in the buffer upon return.
Return Value:
NTSTATUS - STATUS_BUFFER_OVERFLOW if the entire name can't be copied.
--*/
{
NTSTATUS Status = STATUS_SUCCESS;
ULONG LengthToCopy;
PAGED_CODE();
ASSERT(*Length >= sizeof(ULONG));
//
// Simply copy the name in the file object to the user's buffer.
//
//
// Place the size of the filename in the user's buffer and reduce the remaining
// size to match.
//
Buffer->FileNameLength = LengthToCopy = FileObject->FileName.Length;
*Length -= sizeof(ULONG);
if (LengthToCopy > *Length) {
LengthToCopy = *Length;
Status = STATUS_BUFFER_OVERFLOW;
}
RtlCopyMemory( Buffer->FileName, FileObject->FileName.Buffer, LengthToCopy );
//
// Reduce the available bytes by the amount stored into this buffer. In the overflow
// case, this simply drops to zero. The returned filenamelength will indicate to the
// caller how much space is required.
//
*Length -= LengthToCopy;
return Status;
}
//
// Local support routine
//
NTSTATUS
UdfQueryAlternateNameInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN PCCB Ccb,
IN OUT PFILE_NAME_INFORMATION Buffer,
IN OUT PULONG Length
)
/*++
Routine Description:
This routine performs the query alternate name information function.
We lookup the dirent for this file and then check if there is a
short name.
Arguments:
Fcb - Supplies the Fcb being queried, it has been verified.
Ccb - Ccb for this open handle.
Buffer - Supplies a pointer to the buffer where the information is to
be returned.
Length - Supplies the length of the buffer in bytes, and receives the
remaining bytes free in the buffer upon return.
Return Value:
NTSTATUS - STATUS_SUCCESS if the whole name would fit into the user buffer,
STATUS_OBJECT_NAME_NOT_FOUND if we can't return the name,
STATUS_BUFFER_OVERFLOW otherwise.
--*/
{
NTSTATUS Status = STATUS_SUCCESS;
DIR_ENUM_CONTEXT DirContext;
PLCB Lcb;
PFCB ParentFcb;
BOOLEAN ReleaseParentFcb = FALSE;
BOOLEAN CleanupDirContext = FALSE;
BOOLEAN Result;
PUNICODE_STRING ShortName;
UNICODE_STRING LocalShortName;
WCHAR LocalShortNameBuffer[ BYTE_COUNT_8_DOT_3 / sizeof(WCHAR) ];
PAGED_CODE();
//
// Initialize the buffer length to zero.
//
Buffer->FileNameLength = 0;
//
// If there was no associated Lcb then there is no short name.
//
Lcb = Ccb->Lcb;
if (Lcb == NULL) {
return STATUS_OBJECT_NAME_NOT_FOUND;
}
//
// Use a try-finally to cleanup the structures.
//
try {
if (FlagOn( Lcb->Flags, LCB_FLAG_SHORT_NAME )) {
//
// This caller opened the file by a generated short name, so simply hand it back.
//
ShortName = &Lcb->FileName;
} else {
//
// The open occured by a regular name. Now, if this name is already 8.3 legal then
// there is no short name.
//
if (UdfIs8dot3Name( IrpContext, Lcb->FileName )) {
try_leave( Status = STATUS_OBJECT_NAME_NOT_FOUND );
}
//
// This name has a generated short name. In order to calculate this name we have to
// retrieve the FID for this file, since UDF specifies that a short name is uniquified
// with a CRC of the original in-FID byte representation of the filename.
//
// N.B.: if this is a common operation, we may wish to cache the CRC in the Lcb.
//
ParentFcb = Lcb->ParentFcb;
UdfAcquireFileShared( IrpContext, ParentFcb );
ReleaseParentFcb = TRUE;
//
// Now go find the FID for this filename in the parent.
//
UdfInitializeDirContext( IrpContext, &DirContext );
CleanupDirContext = TRUE;
Result = UdfFindDirEntry( IrpContext,
ParentFcb,
&Lcb->FileName,
BooleanFlagOn( Lcb->Flags, LCB_FLAG_IGNORE_CASE ),
FALSE,
&DirContext );
//
// We should always be able to find this entry, but don't bugcheck because
// we messed this up.
//
ASSERT( Result );
if (!Result) {
try_leave( Status = STATUS_OBJECT_NAME_NOT_FOUND );
}
//
// Build the local unicode string to use and fill it in.
//
ShortName = &LocalShortName;
LocalShortName.Buffer = LocalShortNameBuffer;
LocalShortName.Length = 0;
LocalShortName.MaximumLength = sizeof( LocalShortNameBuffer );
UdfGenerate8dot3Name( IrpContext,
&DirContext.CaseObjectName,
ShortName );
}
//
// We now have the short name. We have left it in Unicode form so copy it directly.
//
Buffer->FileNameLength = ShortName->Length;
if (Buffer->FileNameLength + sizeof( ULONG ) > *Length) {
Buffer->FileNameLength = *Length - sizeof( ULONG );
Status = STATUS_BUFFER_OVERFLOW;
}
RtlCopyMemory( Buffer->FileName, ShortName->Buffer, Buffer->FileNameLength );
} finally {
if (CleanupDirContext) {
UdfCleanupDirContext( IrpContext, &DirContext );
}
if (ReleaseParentFcb) {
UdfReleaseFile( IrpContext, ParentFcb );
}
}
//
// Reduce the available bytes by the amount stored into this buffer.
//
if (Status != STATUS_OBJECT_NAME_NOT_FOUND) {
*Length -= sizeof( ULONG ) + Buffer->FileNameLength;
}
return Status;
}
//
// Local support routine
//
VOID
UdfQueryNetworkInfo (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN PCCB Ccb,
IN OUT PFILE_NETWORK_OPEN_INFORMATION Buffer,
IN OUT PULONG Length
)
/*++
Description:
This routine performs the query network open information function for Udfs.
Arguments:
Fcb - Supplies the Fcb being queried, it has been verified
Buffer - Supplies a pointer to the buffer where the information is to
be returned
Length - Supplies the length of the buffer in bytes, and receives the
remaining bytes free in the buffer upon return.
Return Value:
None
--*/
{
PAGED_CODE();
//
// We support all times on Udfs.
//
Buffer->CreationTime = Fcb->Timestamps.CreationTime;
Buffer->LastWriteTime =
Buffer->ChangeTime = Fcb->Timestamps.ModificationTime;
Buffer->LastAccessTime = Fcb->Timestamps.AccessTime;
Buffer->FileAttributes = Fcb->FileAttributes | UdfGetExtraFileAttributes( Ccb );
//
// We get the sizes from the header. Return a size of zero
// for all directories.
//
if (FlagOn( Fcb->FileAttributes, FILE_ATTRIBUTE_DIRECTORY )) {
Buffer->AllocationSize.QuadPart =
Buffer->EndOfFile.QuadPart = 0;
} else {
Buffer->AllocationSize.QuadPart = Fcb->AllocationSize.QuadPart;
Buffer->EndOfFile.QuadPart = Fcb->FileSize.QuadPart;
}
//
// Update the length and status output variables
//
*Length -= sizeof( FILE_NETWORK_OPEN_INFORMATION );
return;
}
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