1 files changed, 360 insertions, 0 deletions

diff --git a/private/ntos/npfs/volinfo.c b/private/ntos/npfs/volinfo.c
new file mode 100644
index 000000000..b3010c1d2
--- /dev/null
+++ b/private/ntos/npfs/volinfo.c
@@ -0,0 +1,360 @@
+/*++
+
+Copyright (c) 1989  Microsoft Corporation
+
+Module Name:
+
+    VolInfo.c
+
+Abstract:
+
+    This module implements the volume information routines for NPFS called by
+    the dispatch driver.
+
+Author:
+
+    Gary Kimura     [GaryKi]    12-Apr-1990
+
+Revision History:
+
+--*/
+
+#include "NpProcs.h"
+
+//
+//  The local debug trace level
+//
+
+#define Dbg                              (DEBUG_TRACE_VOLINFO)
+
+//
+//  Local procedure prototypes
+//
+
+NTSTATUS
+NpCommonQueryVolumeInformation (
+    IN PIRP Irp
+    );
+
+NTSTATUS
+NpQueryFsDeviceInfo (
+    IN PFILE_FS_DEVICE_INFORMATION Buffer,
+    IN OUT PULONG Length
+    );
+
+NTSTATUS
+NpQueryFsAttributeInfo (
+    IN PFILE_FS_ATTRIBUTE_INFORMATION Buffer,
+    IN OUT PULONG Length
+    );
+
+#ifdef ALLOC_PRAGMA
+#pragma alloc_text(PAGE, NpCommonQueryVolumeInformation)
+#pragma alloc_text(PAGE, NpFsdQueryVolumeInformation)
+#pragma alloc_text(PAGE, NpQueryFsAttributeInfo)
+#pragma alloc_text(PAGE, NpQueryFsDeviceInfo)
+#endif
+
+
+NTSTATUS
+NpFsdQueryVolumeInformation (
+    IN PNPFS_DEVICE_OBJECT NpfsDeviceObject,
+    IN PIRP Irp
+    )
+
+/*++
+
+Routine Description:
+
+    This routine implements the Fsd part of the NtQueryVolumeInformation API
+    call.
+
+Arguments:
+
+    VolumeDeviceObject - Supplies the volume device object where the file
+        being queried exists.
+
+    Irp - Supplies the Irp being processed.
+
+Return Value:
+
+    NTSTATUS - The FSD status for the Irp.
+
+--*/
+
+{
+    NTSTATUS Status;
+
+    PAGED_CODE();
+
+    DebugTrace(+1, Dbg, "NpFsdQueryVolumeInformation\n", 0);
+
+    //
+    //  Call the common query routine, with blocking allowed if synchronous
+    //
+
+    FsRtlEnterFileSystem();
+
+    try {
+
+        Status = NpCommonQueryVolumeInformation( Irp );
+
+    } except(NpExceptionFilter(  GetExceptionCode() )) {
+
+        //
+        //  We had some trouble trying to perform the requested
+        //  operation, so we'll abort the I/O request with
+        //  the error status that we get back from the
+        //  execption code
+        //
+
+        Status = NpProcessException( NpfsDeviceObject, Irp, GetExceptionCode() );
+    }
+
+    FsRtlExitFileSystem();
+
+    //
+    //  And return to our caller
+    //
+
+    DebugTrace(-1, Dbg, "NpFsdQueryVolumeInformation -> %08lx\n", Status);
+
+    return Status;
+}
+
+//
+//  Internal support routine
+//
+
+NTSTATUS
+NpCommonQueryVolumeInformation (
+    IN PIRP Irp
+    )
+
+/*++
+
+Routine Description:
+
+    This is the common routine for querying volume information.
+
+Arguments:
+
+    Irp - Supplies the Irp being processed
+
+Return Value:
+
+    NTSTATUS - The return status for the operation
+
+--*/
+
+{
+    NTSTATUS Status;
+    PIO_STACK_LOCATION IrpSp;
+
+    ULONG Length;
+    FS_INFORMATION_CLASS FsInformationClass;
+    PVOID Buffer;
+
+    PAGED_CODE();
+
+    //
+    //  Get the current stack location
+    //
+
+    IrpSp = IoGetCurrentIrpStackLocation( Irp );
+
+    DebugTrace(+1, Dbg, "NptCommonQueryVolumeInfo...\n", 0);
+    DebugTrace( 0, Dbg, "Irp                = %08lx\n", Irp );
+    DebugTrace( 0, Dbg, "Length             = %08lx\n", IrpSp->Parameters.QueryVolume.Length);
+    DebugTrace( 0, Dbg, "FsInformationClass = %08lx\n", IrpSp->Parameters.QueryVolume.FsInformationClass);
+    DebugTrace( 0, Dbg, "Buffer             = %08lx\n", Irp->AssociatedIrp.SystemBuffer);
+
+    //
+    //  Reference our input parameters to make things easier
+    //
+
+    Length = IrpSp->Parameters.QueryVolume.Length;
+    FsInformationClass = IrpSp->Parameters.QueryVolume.FsInformationClass;
+    Buffer = Irp->AssociatedIrp.SystemBuffer;
+
+    switch (FsInformationClass) {
+
+    case FileFsDeviceInformation:
+
+        Status = NpQueryFsDeviceInfo( Buffer, &Length );
+        break;
+
+    case FileFsAttributeInformation:
+
+        Status = NpQueryFsAttributeInfo( Buffer, &Length );
+        break;
+
+    default:
+
+        Status = STATUS_NOT_SUPPORTED;
+        break;
+    }
+
+    //
+    //  Set the information field to the number of bytes actually filled in
+    //
+
+    Irp->IoStatus.Information = IrpSp->Parameters.QueryVolume.Length - Length;
+
+    //
+    //  Complete the request
+
+    NpCompleteRequest( Irp, Status );
+
+    //
+    //  And return to our caller
+    //
+
+    DebugTrace(-1, Dbg, "NpCommonQueryVolumeInformation -> %08lx\n", Status);
+
+    return Status;
+}
+
+
+//
+//  Internal support routine
+//
+
+NTSTATUS
+NpQueryFsDeviceInfo (
+    IN PFILE_FS_DEVICE_INFORMATION Buffer,
+    IN OUT PULONG Length
+    )
+
+/*++
+
+Routine Description:
+
+    This routine implements the query volume device call
+
+Arguments:
+
+    Buffer - Supplies a pointer to the output buffer where the information
+        is to be returned
+
+    Length - Supplies the length of the buffer in byte.  This variable
+        upon return recieves the remaining bytes free in the buffer
+
+Return Value:
+
+    Status - Returns the status for the query
+
+--*/
+
+{
+    PAGED_CODE();
+
+    DebugTrace(0, Dbg, "NpQueryFsDeviceInfo...\n", 0);
+
+    //
+    //  Make sure the buffer is large enough
+    //
+
+    if (*Length < sizeof(FILE_FS_DEVICE_INFORMATION)) {
+
+        return STATUS_BUFFER_OVERFLOW;
+    }
+
+    RtlZeroMemory( Buffer, sizeof(FILE_FS_DEVICE_INFORMATION) );
+
+    //
+    //  Set the output buffer
+    //
+
+    Buffer->DeviceType = FILE_DEVICE_NAMED_PIPE;
+
+    //
+    //  Adjust the length variable
+    //
+
+    *Length -= sizeof(FILE_FS_DEVICE_INFORMATION);
+
+    //
+    //  And return success to our caller
+    //
+
+    return STATUS_SUCCESS;
+}
+
+
+//
+//  Internal support routine
+//
+
+NTSTATUS
+NpQueryFsAttributeInfo (
+    IN PFILE_FS_ATTRIBUTE_INFORMATION Buffer,
+    IN OUT PULONG Length
+    )
+
+/*++
+
+Routine Description:
+
+    This routine implements the query volume attribute call
+
+Arguments:
+
+    Buffer - Supplies a pointer to the output buffer where the information
+        is to be returned
+
+    Length - Supplies the length of the buffer in byte.  This variable
+        upon return recieves the remaining bytes free in the buffer
+
+Return Value:
+
+    Status - Returns the status for the query
+
+--*/
+
+{
+    ULONG BytesToCopy;
+
+    NTSTATUS Status;
+
+    PAGED_CODE();
+
+    DebugTrace(0, Dbg, "NpQueryFsAttributeInfo...\n", 0);
+
+    //
+    //  Determine how much of the file system name will fit.
+    //
+
+    if ( (*Length - FIELD_OFFSET( FILE_FS_ATTRIBUTE_INFORMATION,
+                                  FileSystemName[0] )) >= 8 ) {
+
+        BytesToCopy = 8;
+        *Length -= FIELD_OFFSET( FILE_FS_ATTRIBUTE_INFORMATION,
+                                 FileSystemName[0] ) + 8;
+        Status = STATUS_SUCCESS;
+
+    } else {
+
+        BytesToCopy = *Length - FIELD_OFFSET( FILE_FS_ATTRIBUTE_INFORMATION,
+                                              FileSystemName[0]);
+        *Length = 0;
+
+        Status = STATUS_BUFFER_OVERFLOW;
+    }
+
+    //
+    //  Set the output buffer
+    //
+
+    Buffer->FileSystemAttributes       = FILE_CASE_PRESERVED_NAMES;
+    Buffer->MaximumComponentNameLength = MAXULONG;
+    Buffer->FileSystemNameLength       = BytesToCopy;
+
+    RtlCopyMemory( &Buffer->FileSystemName[0], L"NPFS", BytesToCopy );
+
+    //
+    //  And return success to our caller
+    //
+
+    return Status;
+}