mirror of
https://github.com/reactos/reactos.git
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252 lines
7.3 KiB
C
252 lines
7.3 KiB
C
/*
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* PROJECT: Filesystem Filter Manager
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: drivers/filters/fltmgr/Context.c
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* PURPOSE: Contains routines for the volume
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* PROGRAMMERS: Ged Murphy (gedmurphy@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include "fltmgr.h"
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#include "fltmgrint.h"
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#define NDEBUG
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#include <debug.h>
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/* DATA *********************************************************************/
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/* EXPORTED FUNCTIONS ******************************************************/
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NTSTATUS
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FLTAPI
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FltGetVolumeProperties(
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_In_ PFLT_VOLUME Volume,
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_Out_writes_bytes_to_opt_(VolumePropertiesLength, *LengthReturned) PFLT_VOLUME_PROPERTIES VolumeProperties,
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_In_ ULONG VolumePropertiesLength,
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_Out_ PULONG LengthReturned
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)
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{
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ULONG BufferRequired;
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ULONG BytesWritten;
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PCHAR Ptr;
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NTSTATUS Status;
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/* Calculate the required buffer size */
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BufferRequired = sizeof(FLT_VOLUME_PROPERTIES) +
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Volume->CDODriverName.Length +
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Volume->DeviceName.Length +
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Volume->CDODeviceName.Length;
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/* If we don't have enough buffer to fill in the fixed struct, return with the required size */
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if (VolumePropertiesLength < sizeof(FLT_VOLUME_PROPERTIES))
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{
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*LengthReturned = BufferRequired;
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return STATUS_BUFFER_TOO_SMALL;
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}
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/* Clear out the buffer */
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RtlZeroMemory(VolumeProperties, sizeof(FLT_VOLUME_PROPERTIES));
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/* Fill in the fixed data */
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VolumeProperties->DeviceType = Volume->DeviceObject->DeviceType;
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VolumeProperties->DeviceObjectFlags = Volume->DeviceObject->Flags;
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VolumeProperties->AlignmentRequirement = Volume->DeviceObject->AlignmentRequirement;
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VolumeProperties->SectorSize = Volume->DeviceObject->SectorSize;
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if (Volume->DiskDeviceObject)
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{
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VolumeProperties->DeviceCharacteristics = Volume->DiskDeviceObject->Characteristics;
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}
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else
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{
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VolumeProperties->DeviceCharacteristics = Volume->DeviceObject->Characteristics;
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}
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/* So far we've written the fixed struct data */
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BytesWritten = sizeof(FLT_VOLUME_PROPERTIES);
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Ptr = (PCHAR)(VolumeProperties + 1);
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/* Make sure we have enough room to add the dynamic data */
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if (VolumePropertiesLength >= BufferRequired)
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{
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/* Add the FS device name */
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VolumeProperties->FileSystemDeviceName.Length = 0;
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VolumeProperties->FileSystemDeviceName.MaximumLength = Volume->CDODeviceName.Length;
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VolumeProperties->FileSystemDeviceName.Buffer = (PWCH)Ptr;
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RtlCopyUnicodeString(&VolumeProperties->FileSystemDeviceName, &Volume->CDODeviceName);
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Ptr += VolumeProperties->FileSystemDeviceName.Length;
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/* Add the driver name */
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VolumeProperties->FileSystemDriverName.Length = 0;
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VolumeProperties->FileSystemDriverName.MaximumLength = Volume->CDODriverName.Length;
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VolumeProperties->FileSystemDriverName.Buffer = (PWCH)Ptr;
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RtlCopyUnicodeString(&VolumeProperties->FileSystemDriverName, &Volume->CDODriverName);
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Ptr += VolumeProperties->FileSystemDriverName.Length;
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/* Add the volume name */
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VolumeProperties->RealDeviceName.Length = 0;
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VolumeProperties->RealDeviceName.MaximumLength = Volume->DeviceName.Length;
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VolumeProperties->RealDeviceName.Buffer = (PWCH)Ptr;
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RtlCopyUnicodeString(&VolumeProperties->RealDeviceName, &Volume->DeviceName);
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BytesWritten = BufferRequired;
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Status = STATUS_SUCCESS;
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}
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else
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{
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Status = STATUS_BUFFER_OVERFLOW;
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}
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/* Set the number of bytes we wrote and return */
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*LengthReturned = BytesWritten;
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return Status;
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}
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NTSTATUS
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FLTAPI
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FltEnumerateVolumes(
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_In_ PFLT_FILTER Filter,
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_Out_writes_to_opt_(VolumeListSize,*NumberVolumesReturned) PFLT_VOLUME *VolumeList,
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_In_ ULONG VolumeListSize,
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_Out_ PULONG NumberVolumesReturned)
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{
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ULONG i;
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PFLTP_FRAME Frame;
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PFLT_VOLUME Volume;
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PLIST_ENTRY ListEntry;
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ULONG NumberOfVolumes = 0;
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NTSTATUS Status = STATUS_SUCCESS;
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PAGED_CODE();
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Frame = Filter->Frame;
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/* Lock the attached volumes list */
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KeEnterCriticalRegion();
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ExAcquireResourceSharedLite(&Frame->AttachedVolumes.rLock, TRUE);
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/* If it's not empty */
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if (!IsListEmpty(&Frame->AttachedVolumes.rList))
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{
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/* Browse every entry */
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for (ListEntry = Frame->AttachedVolumes.rList.Flink;
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ListEntry != &Frame->AttachedVolumes.rList;
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ListEntry = ListEntry->Flink)
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{
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/* Get the volume */
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Volume = CONTAINING_RECORD(ListEntry, FLT_VOLUME, Base.PrimaryLink);
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/* If there's still room in the output buffer */
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if (NumberOfVolumes < VolumeListSize)
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{
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/* Reference the volume and return it */
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FltObjectReference(Volume);
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VolumeList[NumberOfVolumes] = Volume;
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}
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/* We returned one more volume */
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++NumberOfVolumes;
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}
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}
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/* Release the list */
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ExReleaseResourceLite(&Frame->AttachedVolumes.rLock);
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KeLeaveCriticalRegion();
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/* If we want to return more volumes than we can */
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if (NumberOfVolumes > VolumeListSize)
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{
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/* We will clear output */
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for (i = 0; i < VolumeListSize; ++i)
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{
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FltObjectDereference(VolumeList[i]);
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VolumeList[i] = NULL;
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}
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/* And set failure status */
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Status = STATUS_BUFFER_TOO_SMALL;
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}
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/* Always return the max amount of volumes we want to return */
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*NumberVolumesReturned = NumberOfVolumes;
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/* Done */
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return Status;
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}
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NTSTATUS
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FLTAPI
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FltDetachVolume(
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_Inout_ PFLT_FILTER Filter,
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_Inout_ PFLT_VOLUME Volume,
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_In_opt_ PCUNICODE_STRING InstanceName)
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{
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UNIMPLEMENTED;
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return STATUS_NOT_IMPLEMENTED;
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}
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NTSTATUS
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FLTAPI
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FltAttachVolume(
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_Inout_ PFLT_FILTER Filter,
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_Inout_ PFLT_VOLUME Volume,
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_In_opt_ PCUNICODE_STRING InstanceName,
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_Outptr_opt_result_maybenull_ PFLT_INSTANCE *RetInstance)
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{
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UNIMPLEMENTED;
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return STATUS_NOT_IMPLEMENTED;
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}
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NTSTATUS
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FLTAPI
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FltGetVolumeName(
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_In_ PFLT_VOLUME Volume,
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_Inout_opt_ PUNICODE_STRING VolumeName,
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_Out_opt_ PULONG BufferSizeNeeded)
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{
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NTSTATUS Status;
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/* Check if caller just probes for size */
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if (VolumeName == NULL)
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{
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/* Totally broken call */
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if (BufferSizeNeeded == NULL)
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{
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return STATUS_INVALID_PARAMETER;
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}
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/* Return the appropriate size and quit */
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*BufferSizeNeeded = Volume->DeviceName.Length;
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return STATUS_BUFFER_TOO_SMALL;
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}
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/* We have an output buffer! Assume it's too small */
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Status = STATUS_BUFFER_TOO_SMALL;
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/* If we have output size, fill it */
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if (BufferSizeNeeded != NULL)
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{
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*BufferSizeNeeded = Volume->DeviceName.Length;
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}
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/* Init that we didn't return a thing */
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VolumeName->Length = 0;
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/* If we have enough room, copy and return success */
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if (VolumeName->MaximumLength >= Volume->DeviceName.Length)
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{
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RtlCopyUnicodeString(VolumeName, &Volume->DeviceName);
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Status = STATUS_SUCCESS;
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}
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return Status;
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}
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/* INTERNAL FUNCTIONS ******************************************************/
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