505 lines
9.4 KiB
C
505 lines
9.4 KiB
C
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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VolInfo.c
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Abstract:
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This module implements the volume information routines for Udfs called by
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the dispatch driver.
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Author:
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Dan Lovinger [DanLo] 20-Jan-1997
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Revision History:
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--*/
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#include "UdfProcs.h"
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// The Bug check file id for this module
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#define BugCheckFileId (UDFS_BUG_CHECK_VOLINFO)
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// The local debug trace level
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#define Dbg (UDFS_DEBUG_LEVEL_VOLINFO)
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// Local support routines
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NTSTATUS
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UdfQueryFsVolumeInfo (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb,
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IN PFILE_FS_VOLUME_INFORMATION Buffer,
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IN OUT PULONG Length
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);
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NTSTATUS
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UdfQueryFsSizeInfo (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb,
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IN PFILE_FS_SIZE_INFORMATION Buffer,
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IN OUT PULONG Length
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);
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NTSTATUS
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UdfQueryFsDeviceInfo (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb,
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IN PFILE_FS_DEVICE_INFORMATION Buffer,
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IN OUT PULONG Length
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);
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NTSTATUS
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UdfQueryFsAttributeInfo (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb,
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IN PFILE_FS_ATTRIBUTE_INFORMATION Buffer,
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IN OUT PULONG Length
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, UdfCommonQueryVolInfo)
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#pragma alloc_text(PAGE, UdfQueryFsAttributeInfo)
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#pragma alloc_text(PAGE, UdfQueryFsDeviceInfo)
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#pragma alloc_text(PAGE, UdfQueryFsSizeInfo)
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#pragma alloc_text(PAGE, UdfQueryFsVolumeInfo)
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#endif
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NTSTATUS
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UdfCommonQueryVolInfo (
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IN PIRP_CONTEXT IrpContext,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This is the common routine for querying volume information called by both
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the fsd and fsp threads.
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Arguments:
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Irp - Supplies the Irp being processed
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Return Value:
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NTSTATUS - The return status for the operation
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--*/
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{
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NTSTATUS Status = STATUS_INVALID_PARAMETER;
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PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
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ULONG Length;
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TYPE_OF_OPEN TypeOfOpen;
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PFCB Fcb;
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PCCB Ccb;
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PAGED_CODE();
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// Reference our input parameters to make things easier
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Length = IrpSp->Parameters.QueryVolume.Length;
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// Decode the file object and fail if this an unopened file object.
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TypeOfOpen = UdfDecodeFileObject( IrpSp->FileObject, &Fcb, &Ccb );
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if (TypeOfOpen == UnopenedFileObject) {
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UdfCompleteRequest( IrpContext, Irp, STATUS_INVALID_PARAMETER );
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return STATUS_INVALID_PARAMETER;
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}
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// Acquire the Vcb for this volume.
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UdfAcquireVcbShared( IrpContext, Fcb->Vcb, FALSE );
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// Use a try-finally to facilitate cleanup.
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try {
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// Verify the Vcb.
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UdfVerifyVcb( IrpContext, Fcb->Vcb );
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// Based on the information class we'll do different actions. Each
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// of the procedures that we're calling fills up the output buffer
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// if possible and returns true if it successfully filled the buffer
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// and false if it couldn't wait for any I/O to complete.
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switch (IrpSp->Parameters.QueryVolume.FsInformationClass) {
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case FileFsSizeInformation:
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Status = UdfQueryFsSizeInfo( IrpContext, Fcb->Vcb, Irp->AssociatedIrp.SystemBuffer, &Length );
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break;
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case FileFsVolumeInformation:
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Status = UdfQueryFsVolumeInfo( IrpContext, Fcb->Vcb, Irp->AssociatedIrp.SystemBuffer, &Length );
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break;
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case FileFsDeviceInformation:
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Status = UdfQueryFsDeviceInfo( IrpContext, Fcb->Vcb, Irp->AssociatedIrp.SystemBuffer, &Length );
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break;
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case FileFsAttributeInformation:
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Status = UdfQueryFsAttributeInfo( IrpContext, Fcb->Vcb, Irp->AssociatedIrp.SystemBuffer, &Length );
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break;
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}
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// Set the information field to the number of bytes actually filled in
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Irp->IoStatus.Information = IrpSp->Parameters.QueryVolume.Length - Length;
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} finally {
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// Release the Vcb.
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UdfReleaseVcb( IrpContext, Fcb->Vcb );
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}
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// Complete the request if we didn't raise.
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UdfCompleteRequest( IrpContext, Irp, Status );
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return Status;
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}
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// Local support routine
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NTSTATUS
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UdfQueryFsVolumeInfo (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb,
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IN PFILE_FS_VOLUME_INFORMATION Buffer,
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IN OUT PULONG Length
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)
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/*++
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Routine Description:
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This routine implements the query volume info call
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Arguments:
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Vcb - Vcb for this volume.
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Buffer - Supplies a pointer to the output buffer where the information
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is to be returned
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Length - Supplies the length of the buffer in byte. This variable
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upon return recieves the remaining bytes free in the buffer
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Return Value:
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NTSTATUS - Returns the status for the query
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--*/
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{
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ULONG BytesToCopy;
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NTSTATUS Status = STATUS_SUCCESS;
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PAGED_CODE();
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// Fill in the data from the Vcb.
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Buffer->VolumeCreationTime = Vcb->VolumeDasdFcb->Timestamps.CreationTime;
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Buffer->VolumeSerialNumber = Vcb->Vpb->SerialNumber;
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Buffer->SupportsObjects = FALSE;
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*Length -= FIELD_OFFSET( FILE_FS_VOLUME_INFORMATION, VolumeLabel[0] );
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// Check if the buffer we're given is long enough
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if (*Length >= (ULONG) Vcb->Vpb->VolumeLabelLength) {
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BytesToCopy = Vcb->Vpb->VolumeLabelLength;
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} else {
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BytesToCopy = *Length;
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Status = STATUS_BUFFER_OVERFLOW;
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}
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// Copy over what we can of the volume label, and adjust *Length
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Buffer->VolumeLabelLength = BytesToCopy;
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if (BytesToCopy) {
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RtlCopyMemory( &Buffer->VolumeLabel[0],
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&Vcb->Vpb->VolumeLabel[0],
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BytesToCopy );
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}
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*Length -= BytesToCopy;
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// Set our status and return to our caller
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return Status;
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}
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// Local support routine
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NTSTATUS
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UdfQueryFsSizeInfo (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb,
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IN PFILE_FS_SIZE_INFORMATION Buffer,
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IN OUT PULONG Length
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)
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/*++
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Routine Description:
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This routine implements the query volume size call.
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Arguments:
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Vcb - Vcb for this volume.
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Buffer - Supplies a pointer to the output buffer where the information
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is to be returned
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Length - Supplies the length of the buffer in byte. This variable
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upon return recieves the remaining bytes free in the buffer
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Return Value:
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NTSTATUS - Returns the status for the query
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--*/
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{
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PAGED_CODE();
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// Fill in the output buffer.
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Buffer->TotalAllocationUnits.QuadPart = LlBlocksFromBytes( Vcb, Vcb->VolumeDasdFcb->AllocationSize.QuadPart );
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Buffer->AvailableAllocationUnits.QuadPart = 0;
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Buffer->SectorsPerAllocationUnit = SectorsFromBytes( Vcb, BlockSize( Vcb ));
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Buffer->BytesPerSector = SectorSize( Vcb );
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// Adjust the length variable
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*Length -= sizeof( FILE_FS_SIZE_INFORMATION );
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// And return success to our caller
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return STATUS_SUCCESS;
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}
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// Local support routine
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NTSTATUS
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UdfQueryFsDeviceInfo (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb,
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IN PFILE_FS_DEVICE_INFORMATION Buffer,
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IN OUT PULONG Length
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)
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/*++
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Routine Description:
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This routine implements the query volume device call.
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Arguments:
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Vcb - Vcb for this volume.
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Buffer - Supplies a pointer to the output buffer where the information
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is to be returned
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Length - Supplies the length of the buffer in byte. This variable
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upon return recieves the remaining bytes free in the buffer
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Return Value:
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NTSTATUS - Returns the status for the query
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--*/
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{
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PAGED_CODE();
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// Update the output buffer.
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Buffer->Characteristics = Vcb->TargetDeviceObject->Characteristics;
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Buffer->DeviceType = FILE_DEVICE_CD_ROM;
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// Adjust the length variable
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*Length -= sizeof( FILE_FS_DEVICE_INFORMATION );
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// And return success to our caller
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return STATUS_SUCCESS;
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}
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// Local support routine
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NTSTATUS
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UdfQueryFsAttributeInfo (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb,
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IN PFILE_FS_ATTRIBUTE_INFORMATION Buffer,
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IN OUT PULONG Length
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)
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/*++
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Routine Description:
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This routine implements the query volume attribute call.
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Arguments:
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Vcb - Vcb for this volume.
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Buffer - Supplies a pointer to the output buffer where the information
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is to be returned
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Length - Supplies the length of the buffer in byte. This variable
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upon return recieves the remaining bytes free in the buffer
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Return Value:
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NTSTATUS - Returns the status for the query
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--*/
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{
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ULONG BytesToCopy;
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NTSTATUS Status = STATUS_SUCCESS;
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PAGED_CODE();
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// Fill out the fixed portion of the buffer.
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Buffer->FileSystemAttributes = FILE_CASE_SENSITIVE_SEARCH |
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FILE_UNICODE_ON_DISK;
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Buffer->MaximumComponentNameLength = 255;
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*Length -= FIELD_OFFSET( FILE_FS_ATTRIBUTE_INFORMATION, FileSystemName );
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// Make sure we can copy full unicode characters.
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ClearFlag( *Length, 1 );
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// Determine how much of the file system name will fit.
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if (*Length >= 6) {
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BytesToCopy = 6;
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} else {
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BytesToCopy = *Length;
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Status = STATUS_BUFFER_OVERFLOW;
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}
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*Length -= BytesToCopy;
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// Do the file system name. We explicitly share this designation with all
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// Microsoft implementations of the UDF filesystem - DO NOT CHANGE!
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Buffer->FileSystemNameLength = BytesToCopy;
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RtlCopyMemory( &Buffer->FileSystemName[0], L"UDF", BytesToCopy );
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// And return to our caller
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return Status;
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}
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