📄 volume.c
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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/fs/vfat/volume.c
* PURPOSE: VFAT Filesystem
* PROGRAMMER: Jason Filby (jasonfilby@yahoo.com)
* Herve Poussineau (reactos@poussine.freesurf.fr)
*/
/* INCLUDES *****************************************************************/
#define NDEBUG
#include "vfat.h"
/* FUNCTIONS ****************************************************************/
static NTSTATUS
FsdGetFsVolumeInformation(PDEVICE_OBJECT DeviceObject,
PFILE_FS_VOLUME_INFORMATION FsVolumeInfo,
PULONG BufferLength)
{
DPRINT("FsdGetFsVolumeInformation()\n");
DPRINT("FsVolumeInfo = %p\n", FsVolumeInfo);
DPRINT("BufferLength %lu\n", *BufferLength);
DPRINT("Required length %lu\n", (sizeof(FILE_FS_VOLUME_INFORMATION) + DeviceObject->Vpb->VolumeLabelLength));
DPRINT("LabelLength %hu\n", DeviceObject->Vpb->VolumeLabelLength);
DPRINT("Label %*.S\n", DeviceObject->Vpb->VolumeLabelLength / sizeof(WCHAR), DeviceObject->Vpb->VolumeLabel);
if (*BufferLength < sizeof(FILE_FS_VOLUME_INFORMATION))
return STATUS_INFO_LENGTH_MISMATCH;
if (*BufferLength < (sizeof(FILE_FS_VOLUME_INFORMATION) + DeviceObject->Vpb->VolumeLabelLength))
return STATUS_BUFFER_OVERFLOW;
/* valid entries */
FsVolumeInfo->VolumeSerialNumber = DeviceObject->Vpb->SerialNumber;
FsVolumeInfo->VolumeLabelLength = DeviceObject->Vpb->VolumeLabelLength;
RtlCopyMemory(FsVolumeInfo->VolumeLabel, DeviceObject->Vpb->VolumeLabel, FsVolumeInfo->VolumeLabelLength);
/* dummy entries */
FsVolumeInfo->VolumeCreationTime.QuadPart = 0;
FsVolumeInfo->SupportsObjects = FALSE;
DPRINT("Finished FsdGetFsVolumeInformation()\n");
*BufferLength -= (sizeof(FILE_FS_VOLUME_INFORMATION) + DeviceObject->Vpb->VolumeLabelLength);
DPRINT("BufferLength %lu\n", *BufferLength);
return(STATUS_SUCCESS);
}
static NTSTATUS
FsdGetFsAttributeInformation(PDEVICE_EXTENSION DeviceExt,
PFILE_FS_ATTRIBUTE_INFORMATION FsAttributeInfo,
PULONG BufferLength)
{
PCWSTR pName; ULONG Length;
DPRINT("FsdGetFsAttributeInformation()\n");
DPRINT("FsAttributeInfo = %p\n", FsAttributeInfo);
DPRINT("BufferLength %lu\n", *BufferLength);
if (*BufferLength < sizeof (FILE_FS_ATTRIBUTE_INFORMATION))
return STATUS_INFO_LENGTH_MISMATCH;
if (DeviceExt->FatInfo.FatType == FAT32)
{
Length = 10;
pName = L"FAT32";
}
else
{
Length = 6;
pName = L"FAT";
}
DPRINT("Required length %lu\n", (sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + Length));
if (*BufferLength < (sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + Length))
return STATUS_BUFFER_OVERFLOW;
FsAttributeInfo->FileSystemAttributes =
FILE_CASE_PRESERVED_NAMES | FILE_UNICODE_ON_DISK;
FsAttributeInfo->MaximumComponentNameLength = 255;
FsAttributeInfo->FileSystemNameLength = Length;
RtlCopyMemory(FsAttributeInfo->FileSystemName, pName, Length );
DPRINT("Finished FsdGetFsAttributeInformation()\n");
*BufferLength -= (sizeof(FILE_FS_ATTRIBUTE_INFORMATION) + Length);
DPRINT("BufferLength %lu\n", *BufferLength);
return(STATUS_SUCCESS);
}
static NTSTATUS
FsdGetFsSizeInformation(PDEVICE_OBJECT DeviceObject,
PFILE_FS_SIZE_INFORMATION FsSizeInfo,
PULONG BufferLength)
{
PDEVICE_EXTENSION DeviceExt;
NTSTATUS Status;
DPRINT("FsdGetFsSizeInformation()\n");
DPRINT("FsSizeInfo = %p\n", FsSizeInfo);
if (*BufferLength < sizeof(FILE_FS_SIZE_INFORMATION))
return(STATUS_BUFFER_OVERFLOW);
DeviceExt = DeviceObject->DeviceExtension;
Status = CountAvailableClusters(DeviceExt, &FsSizeInfo->AvailableAllocationUnits);
FsSizeInfo->TotalAllocationUnits.QuadPart = DeviceExt->FatInfo.NumberOfClusters;
FsSizeInfo->SectorsPerAllocationUnit = DeviceExt->FatInfo.SectorsPerCluster;
FsSizeInfo->BytesPerSector = DeviceExt->FatInfo.BytesPerSector;
DPRINT("Finished FsdGetFsSizeInformation()\n");
if (NT_SUCCESS(Status))
*BufferLength -= sizeof(FILE_FS_SIZE_INFORMATION);
return(Status);
}
static NTSTATUS
FsdGetFsDeviceInformation(PFILE_FS_DEVICE_INFORMATION FsDeviceInfo,
PULONG BufferLength)
{
DPRINT("FsdGetFsDeviceInformation()\n");
DPRINT("FsDeviceInfo = %p\n", FsDeviceInfo);
DPRINT("BufferLength %lu\n", *BufferLength);
DPRINT("Required length %lu\n", sizeof(FILE_FS_DEVICE_INFORMATION));
if (*BufferLength < sizeof(FILE_FS_DEVICE_INFORMATION))
return(STATUS_BUFFER_OVERFLOW);
FsDeviceInfo->DeviceType = FILE_DEVICE_DISK;
FsDeviceInfo->Characteristics = 0; /* FIXME: fix this !! */
DPRINT("FsdGetFsDeviceInformation() finished.\n");
*BufferLength -= sizeof(FILE_FS_DEVICE_INFORMATION);
DPRINT("BufferLength %lu\n", *BufferLength);
return(STATUS_SUCCESS);
}
static NTSTATUS
FsdSetFsLabelInformation(PDEVICE_OBJECT DeviceObject,
PFILE_FS_LABEL_INFORMATION FsLabelInfo)
{
PDEVICE_EXTENSION DeviceExt;
PVOID Context = NULL;
ULONG DirIndex = 0;
PDIR_ENTRY Entry;
PVFATFCB pRootFcb;
LARGE_INTEGER FileOffset;
BOOLEAN LabelFound = FALSE;
DIR_ENTRY VolumeLabelDirEntry;
ULONG VolumeLabelDirIndex;
ULONG LabelLen;
NTSTATUS Status = STATUS_UNSUCCESSFUL;
OEM_STRING StringO;
UNICODE_STRING StringW;
CHAR cString[43];
ULONG SizeDirEntry;
ULONG EntriesPerPage;
DPRINT("FsdSetFsLabelInformation()\n");
DeviceExt = (PDEVICE_EXTENSION)DeviceObject->DeviceExtension;
if (sizeof(DeviceObject->Vpb->VolumeLabel) < FsLabelInfo->VolumeLabelLength)
{
CHECKPOINT;
return STATUS_NAME_TOO_LONG;
}
if (DeviceExt->Flags & VCB_IS_FATX)
{
if (FsLabelInfo->VolumeLabelLength / sizeof(WCHAR) > 42)
return STATUS_NAME_TOO_LONG;
SizeDirEntry = sizeof(FATX_DIR_ENTRY);
EntriesPerPage = FATX_ENTRIES_PER_PAGE;
}
else
{
if (FsLabelInfo->VolumeLabelLength / sizeof(WCHAR) > 11)
return STATUS_NAME_TOO_LONG;
SizeDirEntry = sizeof(FAT_DIR_ENTRY);
EntriesPerPage = FAT_ENTRIES_PER_PAGE;
}
/* Create Volume label dir entry */
LabelLen = FsLabelInfo->VolumeLabelLength / sizeof(WCHAR);
RtlZeroMemory(&VolumeLabelDirEntry, SizeDirEntry);
StringW.Buffer = FsLabelInfo->VolumeLabel;
StringW.Length = StringW.MaximumLength = (USHORT)FsLabelInfo->VolumeLabelLength;
StringO.Buffer = cString;
StringO.Length = 0;
StringO.MaximumLength = 42;
Status = RtlUnicodeStringToOemString(&StringO, &StringW, FALSE);
if (!NT_SUCCESS(Status))
return Status;
if (DeviceExt->Flags & VCB_IS_FATX)
{
RtlCopyMemory(VolumeLabelDirEntry.FatX.Filename, cString, LabelLen);
memset(&VolumeLabelDirEntry.FatX.Filename[LabelLen], ' ', 42 - LabelLen);
VolumeLabelDirEntry.FatX.Attrib = 0x08;
}
else
{
RtlCopyMemory(VolumeLabelDirEntry.Fat.Filename, cString, LabelLen);
memset(&VolumeLabelDirEntry.Fat.Filename[LabelLen], ' ', 11 - LabelLen);
VolumeLabelDirEntry.Fat.Attrib = 0x08;
}
pRootFcb = vfatOpenRootFCB(DeviceExt);
/* Search existing volume entry on disk */
FileOffset.QuadPart = 0;
if (CcPinRead(pRootFcb->FileObject, &FileOffset, PAGE_SIZE, TRUE, &Context, (PVOID*)&Entry))
{
while (TRUE)
{
if (ENTRY_VOLUME(DeviceExt, Entry))
{
/* Update entry */
LabelFound = TRUE;
RtlCopyMemory(Entry, &VolumeLabelDirEntry, SizeDirEntry);
CcSetDirtyPinnedData(Context, NULL);
Status = STATUS_SUCCESS;
break;
}
if (ENTRY_END(DeviceExt, Entry))
{
break;
}
DirIndex++;
Entry = (PDIR_ENTRY)((ULONG_PTR)Entry + SizeDirEntry);
if ((DirIndex % EntriesPerPage) == 0)
{
CcUnpinData(Context);
FileOffset.u.LowPart += PAGE_SIZE;
if (!CcPinRead(pRootFcb->FileObject, &FileOffset, PAGE_SIZE, TRUE, &Context, (PVOID*)&Entry))
{
Context = NULL;
break;
}
}
}
if (Context)
{
CcUnpinData(Context);
}
}
if (!LabelFound)
{
/* Add new entry for label */
if (!vfatFindDirSpace(DeviceExt, pRootFcb, 1, &VolumeLabelDirIndex))
Status = STATUS_DISK_FULL;
else
{
FileOffset.u.HighPart = 0;
FileOffset.u.LowPart = VolumeLabelDirIndex * SizeDirEntry;
CcPinRead(pRootFcb->FileObject, &FileOffset, SizeDirEntry,
TRUE, &Context, (PVOID*)&Entry);
RtlCopyMemory(Entry, &VolumeLabelDirEntry, SizeDirEntry);
CcSetDirtyPinnedData(Context, NULL);
CcUnpinData(Context);
Status = STATUS_SUCCESS;
}
}
vfatReleaseFCB(DeviceExt, pRootFcb);
if (!NT_SUCCESS(Status))
{
return Status;
}
/* Update volume label in memory */
DeviceObject->Vpb->VolumeLabelLength = (USHORT)FsLabelInfo->VolumeLabelLength;
RtlCopyMemory(DeviceObject->Vpb->VolumeLabel, FsLabelInfo->VolumeLabel, DeviceObject->Vpb->VolumeLabelLength);
return Status;
}
NTSTATUS VfatQueryVolumeInformation(PVFAT_IRP_CONTEXT IrpContext)
/*
* FUNCTION: Retrieve the specified volume information
*/
{
FS_INFORMATION_CLASS FsInformationClass;
NTSTATUS RC = STATUS_SUCCESS;
PVOID SystemBuffer;
ULONG BufferLength;
/* PRECONDITION */
ASSERT(IrpContext);
DPRINT("VfatQueryVolumeInformation(IrpContext %x)\n", IrpContext);
if (!ExAcquireResourceSharedLite(&((PDEVICE_EXTENSION)IrpContext->DeviceObject->DeviceExtension)->DirResource,
(BOOLEAN)(IrpContext->Flags & IRPCONTEXT_CANWAIT)))
{
return VfatQueueRequest (IrpContext);
}
/* INITIALIZATION */
FsInformationClass = IrpContext->Stack->Parameters.QueryVolume.FsInformationClass;
BufferLength = IrpContext->Stack->Parameters.QueryVolume.Length;
SystemBuffer = IrpContext->Irp->AssociatedIrp.SystemBuffer;
DPRINT ("FsInformationClass %d\n", FsInformationClass);
DPRINT ("SystemBuffer %x\n", SystemBuffer);
switch (FsInformationClass)
{
case FileFsVolumeInformation:
RC = FsdGetFsVolumeInformation(IrpContext->DeviceObject,
SystemBuffer,
&BufferLength);
break;
case FileFsAttributeInformation:
RC = FsdGetFsAttributeInformation(IrpContext->DeviceObject->DeviceExtension,
SystemBuffer,
&BufferLength);
break;
case FileFsSizeInformation:
RC = FsdGetFsSizeInformation(IrpContext->DeviceObject,
SystemBuffer,
&BufferLength);
break;
case FileFsDeviceInformation:
RC = FsdGetFsDeviceInformation(SystemBuffer,
&BufferLength);
break;
default:
RC = STATUS_NOT_SUPPORTED;
}
ExReleaseResourceLite(&((PDEVICE_EXTENSION)IrpContext->DeviceObject->DeviceExtension)->DirResource);
IrpContext->Irp->IoStatus.Status = RC;
if (NT_SUCCESS(RC))
IrpContext->Irp->IoStatus.Information =
IrpContext->Stack->Parameters.QueryVolume.Length - BufferLength;
else
IrpContext->Irp->IoStatus.Information = 0;
IoCompleteRequest(IrpContext->Irp, IO_NO_INCREMENT);
VfatFreeIrpContext(IrpContext);
return RC;
}
NTSTATUS VfatSetVolumeInformation(PVFAT_IRP_CONTEXT IrpContext)
/*
* FUNCTION: Set the specified volume information
*/
{
FS_INFORMATION_CLASS FsInformationClass;
NTSTATUS Status = STATUS_SUCCESS;
PVOID SystemBuffer;
ULONG BufferLength;
PIO_STACK_LOCATION Stack = IrpContext->Stack;
/* PRECONDITION */
ASSERT(IrpContext);
DPRINT ("VfatSetVolumeInformation(IrpContext %x)\n", IrpContext);
if (!ExAcquireResourceExclusiveLite(&((PDEVICE_EXTENSION)IrpContext->DeviceObject->DeviceExtension)->DirResource,
(BOOLEAN)(IrpContext->Flags & IRPCONTEXT_CANWAIT)))
{
return VfatQueueRequest (IrpContext);
}
FsInformationClass = Stack->Parameters.SetVolume.FsInformationClass;
BufferLength = Stack->Parameters.SetVolume.Length;
SystemBuffer = IrpContext->Irp->AssociatedIrp.SystemBuffer;
DPRINT ("FsInformationClass %d\n", FsInformationClass);
DPRINT ("BufferLength %d\n", BufferLength);
DPRINT ("SystemBuffer %x\n", SystemBuffer);
switch(FsInformationClass)
{
case FileFsLabelInformation:
Status = FsdSetFsLabelInformation(IrpContext->DeviceObject,
SystemBuffer);
break;
default:
Status = STATUS_NOT_SUPPORTED;
}
ExReleaseResourceLite(&((PDEVICE_EXTENSION)IrpContext->DeviceObject->DeviceExtension)->DirResource);
IrpContext->Irp->IoStatus.Status = Status;
IrpContext->Irp->IoStatus.Information = 0;
IoCompleteRequest(IrpContext->Irp, IO_NO_INCREMENT);
VfatFreeIrpContext(IrpContext);
return(Status);
}
/* EOF */
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