NTSTATUS
NdFatCommonFlushBuffers (
IN PIRP_CONTEXT IrpContext,
IN PIRP Irp
)
/*++
Routine Description:
This is the common routine for flushing a buffer.
Arguments:
Irp - Supplies the Irp to process
Return Value:
NTSTATUS - The return status for the operation
--*/
{
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp;
PFILE_OBJECT FileObject;
TYPE_OF_OPEN TypeOfOpen;
PVCB Vcb;
PFCB Fcb;
PCCB Ccb;
BOOLEAN VcbAcquired = FALSE;
BOOLEAN FcbAcquired = FALSE;
PDIRENT Dirent;
PBCB DirentBcb = NULL;
PVOLUME_DEVICE_OBJECT volDo = CONTAINING_RECORD( IrpContext->Vcb, VOLUME_DEVICE_OBJECT, Vcb );
BOOLEAN secondarySessionResourceAcquired = FALSE;
PSECONDARY_REQUEST secondaryRequest = NULL;
PNDFS_REQUEST_HEADER ndfsRequestHeader;
PNDFS_WINXP_REQUEST_HEADER ndfsWinxpRequestHeader;
PNDFS_WINXP_REPLY_HEADER ndfsWinxpReplytHeader;
LARGE_INTEGER timeOut;
PAGED_CODE();
IrpSp = IoGetCurrentIrpStackLocation( Irp );
DebugTrace(+1, Dbg, "FatCommonFlushBuffers\n", 0);
DebugTrace( 0, Dbg, "Irp = %08lx\n", Irp);
DebugTrace( 0, Dbg, "->FileObject = %08lx\n", IrpSp->FileObject);
//
// Extract and decode the file object
//
FileObject = IrpSp->FileObject;
TypeOfOpen = FatDecodeFileObject( FileObject, &Vcb, &Fcb, &Ccb );
//
// CcFlushCache is always synchronous, so if we can't wait enqueue
// the irp to the Fsp.
//
if ( !FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) ) {
Status = FatFsdPostRequest( IrpContext, Irp );
DebugTrace(-1, Dbg, "FatCommonFlushBuffers -> %08lx\n", Status );
return Status;
}
Status = STATUS_SUCCESS;
try {
if (!FlagOn(Ccb->NdFatFlags, ND_FAT_CCB_FLAG_UNOPENED)) {
do {
secondarySessionResourceAcquired
= SecondaryAcquireResourceExclusiveLite( IrpContext,
&volDo->Secondary->SessionResource,
BooleanFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) );
if (FlagOn(volDo->Secondary->Thread.Flags, SECONDARY_THREAD_FLAG_REMOTE_DISCONNECTED) ) {
PrintIrp( Dbg2, "SECONDARY_THREAD_FLAG_REMOTE_DISCONNECTED", NULL, IrpContext->OriginatingIrp );
FatRaiseStatus( IrpContext, STATUS_CANT_WAIT );
}
secondaryRequest = ALLOC_WINXP_SECONDARY_REQUEST( volDo->Secondary, IRP_MJ_FLUSH_BUFFERS, 0 );
if (secondaryRequest == NULL) {
Status = STATUS_INSUFFICIENT_RESOURCES;
break;
}
ndfsRequestHeader = &secondaryRequest->NdfsRequestHeader;
INITIALIZE_NDFS_REQUEST_HEADER( ndfsRequestHeader, NDFS_COMMAND_EXECUTE, volDo->Secondary, IRP_MJ_FLUSH_BUFFERS, 0 );
ndfsWinxpRequestHeader = (PNDFS_WINXP_REQUEST_HEADER)(ndfsRequestHeader+1);
ASSERT( ndfsWinxpRequestHeader == (PNDFS_WINXP_REQUEST_HEADER)secondaryRequest->NdfsRequestData );
INITIALIZE_NDFS_WINXP_REQUEST_HEADER( ndfsWinxpRequestHeader,
IrpContext->OriginatingIrp,
IoGetCurrentIrpStackLocation(IrpContext->OriginatingIrp),
Ccb->PrimaryFileHandle );
ASSERT( !ExIsResourceAcquiredSharedLite(&IrpContext->Vcb->Resource) );
secondaryRequest->RequestType = SECONDARY_REQ_SEND_MESSAGE;
QueueingSecondaryRequest( volDo->Secondary, secondaryRequest );
timeOut.QuadPart = -NDFAT_TIME_OUT;
Status = KeWaitForSingleObject( &secondaryRequest->CompleteEvent, Executive, KernelMode, FALSE, &timeOut );
if (Status != STATUS_SUCCESS) {
ASSERT( NDFAT_BUG );
break;
}
KeClearEvent (&secondaryRequest->CompleteEvent);
if (BooleanFlagOn(volDo->Secondary->Thread.Flags, SECONDARY_THREAD_FLAG_REMOTE_DISCONNECTED)) {
FatRaiseStatus( IrpContext, STATUS_CANT_WAIT );
}
if (secondaryRequest->ExecuteStatus == STATUS_SUCCESS) {
ndfsWinxpReplytHeader = (PNDFS_WINXP_REPLY_HEADER)secondaryRequest->NdfsReplyData;
ASSERT(ndfsWinxpReplytHeader->Status == STATUS_SUCCESS);
}
if (secondaryRequest) {
DereferenceSecondaryRequest( secondaryRequest );
secondaryRequest = NULL;
}
if ( secondarySessionResourceAcquired == TRUE ) {
SecondaryReleaseResourceLite( IrpContext, &volDo->Secondary->SessionResource );
secondarySessionResourceAcquired = FALSE;
}
break;
} while(0);
}
Status = STATUS_SUCCESS;
//
// Case on the type of open that we are trying to flush
//
switch (TypeOfOpen) {
case VirtualVolumeFile:
case EaFile:
case DirectoryFile:
DebugTrace(0, Dbg, "Flush that does nothing\n", 0);
break;
case UserFileOpen:
DebugTrace(0, Dbg, "Flush User File Open\n", 0);
(VOID)FatAcquireExclusiveFcb( IrpContext, Fcb );
FcbAcquired = TRUE;
FatVerifyFcb( IrpContext, Fcb );
//
// If the file is cached then flush its cache
//
Status = FatFlushFile( IrpContext, Fcb, Flush );
//
// Also update and flush the file's dirent in the parent directory if the
// file flush worked.
//
if (NT_SUCCESS( Status )) {
//
// Insure that we get the filesize to disk correctly. This is
// benign if it was already good.
//
// (why do we need to do this?)
//
SetFlag(FileObject->Flags, FO_FILE_SIZE_CHANGED);
#if 0
FatUpdateDirentFromFcb( IrpContext, FileObject, Fcb, Ccb );
#endif
//
// Flush the volume file to get any allocation information
// updates to disk.
//
if (FlagOn(Fcb->FcbState, FCB_STATE_FLUSH_FAT)) {
Status = FatFlushFat( IrpContext, Vcb );
ClearFlag(Fcb->FcbState, FCB_STATE_FLUSH_FAT);
}
//
// Set the write through bit so that these modifications
// will be completed with the request.
//
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH);
}
break;
case UserDirectoryOpen:
//
// If the user had opened the root directory then we'll
// oblige by flushing the volume.
//
if (NodeType(Fcb) != FAT_NTC_ROOT_DCB) {
DebugTrace(0, Dbg, "Flush a directory does nothing\n", 0);
break;
}
case UserVolumeOpen:
DebugTrace(0, Dbg, "Flush User Volume Open, or root dcb\n", 0);
//
// Acquire exclusive access to the Vcb.
//
{
BOOLEAN Finished;
Finished = FatAcquireExclusiveSecondaryVcb( IrpContext, Vcb );
ASSERT( Finished );
}
VcbAcquired = TRUE;
//
// Mark the volume clean and then flush the volume file,
// and then all directories
//
Status = FatFlushVolume( IrpContext, Vcb, Flush );
//
// If the volume was dirty, do the processing that the delayed
// callback would have done.
//
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_VOLUME_DIRTY)) {
//
// Cancel any pending clean volumes.
//
(VOID)KeCancelTimer( &Vcb->CleanVolumeTimer );
(VOID)KeRemoveQueueDpc( &Vcb->CleanVolumeDpc );
//
// The volume is now clean, note it.
//
if (!FlagOn(Vcb->VcbState, VCB_STATE_FLAG_MOUNTED_DIRTY)) {
FatMarkVolume( IrpContext, Vcb, VolumeClean );
ClearFlag( Vcb->VcbState, VCB_STATE_FLAG_VOLUME_DIRTY );
}
//
// Unlock the volume if it is removable.
//
if (FlagOn(Vcb->VcbState, VCB_STATE_FLAG_REMOVABLE_MEDIA) &&
!FlagOn(Vcb->VcbState, VCB_STATE_FLAG_BOOT_OR_PAGING_FILE)) {
FatToggleMediaEjectDisable( IrpContext, Vcb, FALSE );
}
}
break;
default:
FatBugCheck( TypeOfOpen, 0, 0 );
}
FatUnpinBcb( IrpContext, DirentBcb );
FatUnpinRepinnedBcbs( IrpContext );
} finally {
DebugUnwind( FatCommonFlushBuffers );
if (secondaryRequest)
DereferenceSecondaryRequest( secondaryRequest );
if (secondarySessionResourceAcquired) {
SecondaryReleaseResourceLite( IrpContext, &volDo->Secondary->SessionResource );
}
FatUnpinBcb( IrpContext, DirentBcb );
if (VcbAcquired) { FatReleaseSecondaryVcb( IrpContext, Vcb ); }
if (FcbAcquired) { FatReleaseFcb( IrpContext, Fcb ); }
//
// If this is a normal termination then pass the request on
// to the target device object.
//
if (!AbnormalTermination()) {
NTSTATUS DriverStatus;
PIO_STACK_LOCATION NextIrpSp;
//
// Get the next stack location, and copy over the stack location
//
NextIrpSp = IoGetNextIrpStackLocation( Irp );
*NextIrpSp = *IrpSp;
//
// Set up the completion routine
//
IoSetCompletionRoutine( Irp,
FatFlushCompletionRoutine,
ULongToPtr( Status ),
TRUE,
TRUE,
TRUE );
//
// Send the request.
//
DriverStatus = IoCallDriver(Vcb->TargetDeviceObject, Irp);
Status = (DriverStatus == STATUS_INVALID_DEVICE_REQUEST) ?
Status : DriverStatus;
//
// Free the IrpContext and return to the caller.
//
FatCompleteRequest( IrpContext, FatNull, STATUS_SUCCESS );
}
DebugTrace(-1, Dbg, "FatCommonFlushBuffers -> %08lx\n", Status);
}
return Status;
}
VOID
FatPrepareWriteDirectoryFile (
IN PIRP_CONTEXT IrpContext,
IN PDCB Dcb,
IN VBO StartingVbo,
IN ULONG ByteCount,
OUT PBCB *Bcb,
OUT PVOID *Buffer,
IN BOOLEAN Zero,
IN BOOLEAN Reversible,
OUT PNTSTATUS Status
)
/*++
Routine Description:
This routine first looks to see if the specified range of sectors
is already in the cache. If so, it increments the BCB PinCount,
sets the BCB dirty, and returns TRUE with the location of the sectors.
The IrpContext->Flags .. Wait == TRUE/FALSE actions of this routine are identical to
FatPrepareWriteVolumeFile() above.
Arguments:
Dcb - Pointer to the DCB for the directory
StartingVbo - The virtual offset of the first byte to be written
ByteCount - Number of bytes to be written
Bcb - Returns a pointer to the BCB which is valid until unpinned
Buffer - Returns a pointer to the sectors, which is valid until unpinned
Zero - Supplies TRUE if the specified range of bytes should be zeroed
Reversible - Supplies TRUE if the specified range of modification should
be repinned so that the operation can be reversed in a controlled
fashion if errors are encountered.
Status - Returns the status of the operation.
--*/
{
LARGE_INTEGER Vbo;
ULONG InitialAllocation;
BOOLEAN UnwindWeAllocatedDiskSpace = FALSE;
ULONG ClusterSize;
PVOID LocalBuffer;
PAGED_CODE();
DebugTrace(+1, Dbg, "FatPrepareWriteDirectoryFile\n", 0);
DebugTrace( 0, Dbg, "Dcb = %08lx\n", Dcb);
DebugTrace( 0, Dbg, "StartingVbo = %08lx\n", (ULONG)StartingVbo);
DebugTrace( 0, Dbg, "ByteCount = %08lx\n", ByteCount);
DebugTrace( 0, Dbg, "Zero = %08lx\n", Zero);
*Bcb = NULL;
*Buffer = NULL;
//
// If we need to create a directory file and initialize the
// cachemap, do so.
//
FatOpenDirectoryFile( IrpContext, Dcb );
//
// If the transfer is beyond the allocation size we need to
// extend the directory's allocation. The call to
// AddFileAllocation will raise a condition if
// it runs out of disk space. Note that the root directory
// cannot be extended.
//
Vbo.QuadPart = StartingVbo;
try {
if (StartingVbo + ByteCount > Dcb->Header.AllocationSize.LowPart) {
if (NodeType(Dcb) == FAT_NTC_ROOT_DCB &&
!FatIsFat32(Dcb->Vcb)) {
FatRaiseStatus( IrpContext, STATUS_DISK_FULL );
}
DebugTrace(0, Dbg, "Try extending normal directory\n", 0);
InitialAllocation = Dcb->Header.AllocationSize.LowPart;
FatAddFileAllocation( IrpContext,
Dcb,
Dcb->Specific.Dcb.DirectoryFile,
StartingVbo + ByteCount );
UnwindWeAllocatedDiskSpace = TRUE;
//
// Inform the cache manager of the new allocation
//
Dcb->Header.FileSize.LowPart =
Dcb->Header.AllocationSize.LowPart;
CcSetFileSizes( Dcb->Specific.Dcb.DirectoryFile,
(PCC_FILE_SIZES)&Dcb->Header.AllocationSize );
//
// Set up the Bitmap buffer if it is not big enough already
//
FatCheckFreeDirentBitmap( IrpContext, Dcb );
//
// The newly allocated clusters should be zeroed starting at
// the previous allocation size
//
Zero = TRUE;
Vbo.QuadPart = InitialAllocation;
ByteCount = Dcb->Header.AllocationSize.LowPart - InitialAllocation;
}
//
// Call the Cache Manager to attempt the transfer, going one cluster
// at a time to avoid pinning across a page boundary.
//
ClusterSize =
1 << Dcb->Vcb->AllocationSupport.LogOfBytesPerCluster;
while (ByteCount > 0) {
ULONG BytesToPin;
*Bcb = NULL;
if (ByteCount > ClusterSize) {
BytesToPin = ClusterSize;
} else {
BytesToPin = ByteCount;
}
ASSERT( (Vbo.QuadPart / ClusterSize) ==
(Vbo.QuadPart + BytesToPin - 1)/ClusterSize );
if (!CcPinRead( Dcb->Specific.Dcb.DirectoryFile,
&Vbo,
BytesToPin,
BooleanFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT),
Bcb,
&LocalBuffer )) {
//
// Could not read the data without waiting (cache miss).
//
FatRaiseStatus( IrpContext, STATUS_CANT_WAIT );
}
//
// Update our caller with the beginning of their request.
//
if (*Buffer == NULL) {
*Buffer = LocalBuffer;
}
DbgDoit( IrpContext->PinCount += 1 )
if (Zero) {
//
// We set this guy dirty right now so that we can raise CANT_WAIT when
// it needs to be done. It'd be beautiful if we could noop the read IO
// since we know we don't care about it.
//
RtlZeroMemory( LocalBuffer, BytesToPin );
CcSetDirtyPinnedData( *Bcb, NULL );
}
ByteCount -= BytesToPin;
Vbo.QuadPart += BytesToPin;
if (ByteCount > 0) {
FatUnpinBcb( IrpContext, *Bcb );
}
}
//
// This lets us get the data pinned until we complete the request
// and writes the dirty bit through to the disk.
//
FatSetDirtyBcb( IrpContext, *Bcb, Dcb->Vcb, Reversible );
*Status = STATUS_SUCCESS;
} finally {
DebugUnwind( FatPrepareWriteDirectoryFile );
if (AbnormalTermination()) {
//
// These steps are carefully arranged - FatTruncateFileAllocation can raise.
// Make sure we unpin the buffer. If FTFA raises, the effect should be benign.
//
FatUnpinBcb(IrpContext, *Bcb);
if (UnwindWeAllocatedDiskSpace == TRUE) {
//
// Inform the cache manager of the change.
//
FatTruncateFileAllocation( IrpContext, Dcb, InitialAllocation );
Dcb->Header.FileSize.LowPart =
Dcb->Header.AllocationSize.LowPart;
CcSetFileSizes( Dcb->Specific.Dcb.DirectoryFile,
(PCC_FILE_SIZES)&Dcb->Header.AllocationSize );
}
}
DebugTrace(-1, Dbg, "FatPrepareWriteDirectoryFile -> (VOID), *Bcb = %08lx\n", *Bcb);
}
return;
}
VOID
FatGetUnicodeNameFromFcb (
IN PIRP_CONTEXT IrpContext,
IN PFCB Fcb,
IN OUT PUNICODE_STRING Lfn
)
/*++
Routine Description:
This routine will return the unicode name for a given Fcb. If the
file has an LFN, it will return this. Otherwise it will return
the UNICODE conversion of the Oem name, properly cased.
Arguments:
Fcb - Supplies the Fcb to query.
Lfn - Supplies a string that already has enough storage for the
full unicode name.
Return Value:
None
--*/
{
PDIRENT Dirent;
PBCB DirentBcb = NULL;
ULONG DirentByteOffset;
CCB LocalCcb;
ASSERT((MAX_LFN_CHARACTERS * sizeof( WCHAR)) == Lfn->MaximumLength);
//
// We'll start by locating the dirent for the name.
//
FatStringTo8dot3( IrpContext,
Fcb->ShortName.Name.Oem,
&LocalCcb.OemQueryTemplate.Constant );
LocalCcb.Flags = 0;
LocalCcb.UnicodeQueryTemplate.Length = 0;
LocalCcb.ContainsWildCards = FALSE;
FatLocateDirent( IrpContext,
Fcb->ParentDcb,
&LocalCcb,
Fcb->LfnOffsetWithinDirectory,
&Dirent,
&DirentBcb,
&DirentByteOffset,
NULL,
Lfn);
try {
//
// If we didn't find the Dirent, something is terribly wrong.
//
if ((DirentBcb == NULL) ||
(DirentByteOffset != Fcb->DirentOffsetWithinDirectory)) {
FatRaiseStatus( IrpContext, STATUS_FILE_INVALID );
}
//
// Check for the easy case.
//
if (Lfn->Length == 0) {
NTSTATUS Status;
OEM_STRING ShortName;
UCHAR ShortNameBuffer[12];
//
// If we thought that there was an LFN here and didn't find one,
// we're as dead. This shouldn't happen in normal operation, but
// if someone scrambles a directory by hand ...
//
ASSERT( Fcb->LfnOffsetWithinDirectory == Fcb->DirentOffsetWithinDirectory );
if (Fcb->LfnOffsetWithinDirectory != Fcb->DirentOffsetWithinDirectory) {
FatRaiseStatus( IrpContext, STATUS_FILE_INVALID );
}
//
// There is no LFN, so manufacture a UNICODE name.
//
ShortName.Length = 0;
ShortName.MaximumLength = 12;
ShortName.Buffer = ShortNameBuffer;
Fat8dot3ToString( IrpContext, Dirent, TRUE, &ShortName );
//
// OK, now convert this string to UNICODE
//
Status = RtlOemStringToCountedUnicodeString( Lfn,
&ShortName,
FALSE );
ASSERT( Status == STATUS_SUCCESS );
}
} finally {
FatUnpinBcb( IrpContext, DirentBcb );
}
}
VOID
FatPrepareWriteVolumeFile (
IN PIRP_CONTEXT IrpContext,
IN PVCB Vcb,
IN VBO StartingVbo,
IN ULONG ByteCount,
OUT PBCB *Bcb,
OUT PVOID *Buffer,
IN BOOLEAN Reversible,
IN BOOLEAN Zero
)
/*++
Routine Description:
This routine first looks to see if the specified range of sectors,
is already in the cache. If so, it increments the BCB PinCount,
sets the BCB dirty, and returns with the location of the sectors.
If the sectors are not in the cache and Wait is TRUE, it finds a
free BCB (potentially causing a flush), and clears out the entire
buffer. Once this is done, it increments the BCB PinCount, sets the
BCB dirty, and returns with the location of the sectors.
If the sectors are not in the cache and Wait is FALSE, this routine
raises STATUS_CANT_WAIT.
Arguments:
Vcb - Pointer to the VCB for the volume
StartingVbo - The virtual offset of the first byte to be written
ByteCount - Number of bytes to be written
Bcb - Returns a pointer to the BCB which is valid until unpinned
Buffer - Returns a pointer to the sectors, which is valid until unpinned
Reversible - Supplies TRUE if the specified range of modification should
be repinned so that the operation can be reversed in a controlled
fashion if errors are encountered.
Zero - Supplies TRUE if the specified range of bytes should be zeroed
--*/
{
LARGE_INTEGER Vbo;
PAGED_CODE();
//
// Check to see that all references are within the Bios Parameter Block
// or the fat(s).
//
ASSERT( ((StartingVbo + ByteCount) <= (ULONG)
(FatRootDirectoryLbo( &Vcb->Bpb ))));
DebugTrace(+1, Dbg, "FatPrepareWriteVolumeFile\n", 0);
DebugTrace( 0, Dbg, "Vcb = %08lx\n", Vcb);
DebugTrace( 0, Dbg, "StartingVbo = %08lx\n", (ULONG)StartingVbo);
DebugTrace( 0, Dbg, "ByteCount = %08lx\n", ByteCount);
DebugTrace( 0, Dbg, "Zero = %08lx\n", Zero);
//
// Call the Cache manager to attempt the transfer.
//
Vbo.QuadPart = StartingVbo;
if (!CcPinRead( Vcb->VirtualVolumeFile,
&Vbo,
ByteCount,
BooleanFlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT),
Bcb,
Buffer )) {
ASSERT( !FlagOn(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT) );
//
// Could not read the data without waiting (cache miss).
//
FatRaiseStatus( IrpContext, STATUS_CANT_WAIT );
}
//
// This keeps the data pinned until we complete the request
// and writes the dirty bit through to the disk.
//
DbgDoit( IrpContext->PinCount += 1 )
try {
if (Zero) {
RtlZeroMemory( *Buffer, ByteCount );
}
FatSetDirtyBcb( IrpContext, *Bcb, Vcb, Reversible );
} finally {
if (AbnormalTermination()) {
FatUnpinBcb(IrpContext, *Bcb);
}
}
DebugTrace(-1, Dbg, "FatPrepareWriteVolumeFile -> VOID, *Bcb = %08lx\n", *Bcb);
return;
}
NTSTATUS
FatSetFsLabelInfo (
IN PIRP_CONTEXT IrpContext,
IN PVCB Vcb,
IN PFILE_FS_LABEL_INFORMATION Buffer
)
/*++
Routine Description:
This routine implements the set volume label call
Arguments:
Vcb - Supplies the Vcb being queried
Buffer - Supplies the input where the information is stored.
Return Value:
NTSTATUS - Returns the status for the operation
--*/
{
NTSTATUS Status;
PDIRENT Dirent;
PBCB DirentBcb = NULL;
ULONG ByteOffset;
WCHAR TmpBuffer[11];
UCHAR OemBuffer[11];
OEM_STRING OemLabel;
UNICODE_STRING UnicodeString;
UNICODE_STRING UpcasedLabel;
DebugTrace(+1, Dbg, "FatSetFsLabelInfo...\n", 0);
//
// Setup our local variable
//
UnicodeString.Length = (USHORT)Buffer->VolumeLabelLength;
UnicodeString.MaximumLength = UnicodeString.Length;
UnicodeString.Buffer = (PWSTR) &Buffer->VolumeLabel[0];
//
// Make sure the name can fit into the stack buffer
//
if ( UnicodeString.Length > 11*sizeof(WCHAR) ) {
return STATUS_INVALID_VOLUME_LABEL;
}
//
// Upcase the name and convert it to the Oem code page.
//
OemLabel.Buffer = &OemBuffer[0];
OemLabel.Length = 0;
OemLabel.MaximumLength = 11;
Status = RtlUpcaseUnicodeStringToCountedOemString( &OemLabel,
&UnicodeString,
FALSE );
//
// Volume label that fits in 11 unicode character length limit
// is not necessary within 11 characters in OEM character set.
//
if (!NT_SUCCESS( Status )) {
DebugTrace(-1, Dbg, "FatSetFsLabelInfo: Label must be too long. %08lx\n", Status );
return STATUS_INVALID_VOLUME_LABEL;
}
//
// Strip spaces off of the label.
//
if (OemLabel.Length > 0) {
USHORT i;
USHORT LastSpaceIndex = MAXUSHORT;
//
// Check the label for illegal characters
//
for ( i = 0; i < (ULONG)OemLabel.Length; i += 1 ) {
if ( FsRtlIsLeadDbcsCharacter( OemLabel.Buffer[i] ) ) {
LastSpaceIndex = MAXUSHORT;
i += 1;
continue;
}
if (!FsRtlIsAnsiCharacterLegalFat(OemLabel.Buffer[i], FALSE) ||
(OemLabel.Buffer[i] == '.')) {
return STATUS_INVALID_VOLUME_LABEL;
}
//
// Watch for the last run of spaces, so we can strip them.
//
if (OemLabel.Buffer[i] == ' ' &&
LastSpaceIndex == MAXUSHORT) {
LastSpaceIndex = i;
} else {
LastSpaceIndex = MAXUSHORT;
}
}
if (LastSpaceIndex != MAXUSHORT) {
OemLabel.Length = LastSpaceIndex;
}
}
//
// Get the Unicode upcased string to store in the VPB.
//
UpcasedLabel.Length = UnicodeString.Length;
UpcasedLabel.MaximumLength = 11*sizeof(WCHAR);
UpcasedLabel.Buffer = &TmpBuffer[0];
Status = RtlOemStringToCountedUnicodeString( &UpcasedLabel,
&OemLabel,
FALSE );
if (!NT_SUCCESS( Status )) {
DebugTrace(-1, Dbg, "FatSetFsLabelInfo: Label must be too long. %08lx\n", Status );
return STATUS_INVALID_VOLUME_LABEL;
}
DirentBcb = NULL;
//
// Make this look like a write through to disk. This is important to
// avoid a unpleasant window where it looks like we have the wrong volume.
//
SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH );
try {
//
// Are we setting or removing the label? Note that shaving spaces could
// make this different than wondering if the input buffer is non-zero length.
//
if (OemLabel.Length > 0) {
//
// Locate the volume label if there already is one
//
FatLocateVolumeLabel( IrpContext,
Vcb,
&Dirent,
&DirentBcb,
&ByteOffset );
//
// Check that we really got one, if not then we need to create
// a new one. The procedure we call will raise an appropriate
// status if we are not able to allocate a new dirent
//
if (Dirent == NULL) {
ByteOffset = FatCreateNewDirent( IrpContext,
Vcb->RootDcb,
1 );
FatPrepareWriteDirectoryFile( IrpContext,
Vcb->RootDcb,
ByteOffset,
sizeof(DIRENT),
&DirentBcb,
&Dirent,
FALSE,
TRUE,
&Status );
ASSERT( NT_SUCCESS( Status ));
} else {
//
// Just mark this guy dirty now.
//
FatSetDirtyBcb( IrpContext, DirentBcb, Vcb, TRUE );
}
//
// Now reconstruct the volume label dirent.
//
FatConstructLabelDirent( IrpContext,
Dirent,
&OemLabel );
//
// Unpin the Bcb here so that we will get any IO errors
// here before changing the VPB label.
//
FatUnpinBcb( IrpContext, DirentBcb );
FatUnpinRepinnedBcbs( IrpContext );
//
// Now set the upcased label in the VPB
//
RtlCopyMemory( &Vcb->Vpb->VolumeLabel[0],
&UpcasedLabel.Buffer[0],
UpcasedLabel.Length );
Vcb->Vpb->VolumeLabelLength = UpcasedLabel.Length;
} else {
//
// Otherwise we're trying to delete the label
// Locate the current volume label if there already is one
//
FatLocateVolumeLabel( IrpContext,
Vcb,
&Dirent,
&DirentBcb,
&ByteOffset );
//
// Check that we really got one
//
if (Dirent == NULL) {
try_return( Status = STATUS_SUCCESS );
}
//
// Now delete the current label.
//
Dirent->FileName[0] = FAT_DIRENT_DELETED;
ASSERT( (Vcb->RootDcb->Specific.Dcb.UnusedDirentVbo == 0xffffffff) ||
RtlAreBitsSet( &Vcb->RootDcb->Specific.Dcb.FreeDirentBitmap,
ByteOffset / sizeof(DIRENT),
1 ) );
RtlClearBits( &Vcb->RootDcb->Specific.Dcb.FreeDirentBitmap,
ByteOffset / sizeof(DIRENT),
1 );
FatSetDirtyBcb( IrpContext, DirentBcb, Vcb, TRUE );
//
// Unpin the Bcb here so that we will get any IO errors
// here before changing the VPB label.
//
FatUnpinBcb( IrpContext, DirentBcb );
FatUnpinRepinnedBcbs( IrpContext );
//
// Now set the label in the VPB
//
Vcb->Vpb->VolumeLabelLength = 0;
}
Status = STATUS_SUCCESS;
FatSortDirectory(IrpContext, Vcb->RootDcb);
try_exit: NOTHING;
} finally {
DebugUnwind( FatSetFsALabelInfo );
FatUnpinBcb( IrpContext, DirentBcb );
DebugTrace(-1, Dbg, "FatSetFsALabelInfo -> STATUS_SUCCESS\n", 0);
}
return Status;
}