windows-xp/Source/XPSP1/NT/base/subsys/sm/server/smpartit.c

#if defined(REMOTE_BOOT)
/*++

Copyright (c) 1989  Microsoft Corporation

Module Name:

    sminit.c

Abstract:

    Session Manager Initialization

Author:

    Mark Lucovsky (markl) 04-Oct-1989

Revision History:

--*/

#include "smsrvp.h"
#include <stdio.h>
#include <string.h>
#include <safeboot.h>
#include <ntdddisk.h>


VOID
SmpGetHarddiskBootPartition(
    OUT PULONG DiskNumber,
    OUT PULONG PartitionNumber
    )
/*++

Routine Description:

    This routine searches the each partition on each hard disk for
    one which has the active bit set, returning the first one encountered.

Arguments:

    DiskNumber - The harddisk number.

    PartitionNumber - The partition number.

Return Value:

    None

--*/

{
    PARTITION_INFORMATION PartitionInfo;
    WCHAR NameBuffer[80];
    HANDLE Handle;
    NTSTATUS Status;
    IO_STATUS_BLOCK IoStatus;
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING UnicodeString;

    *DiskNumber = 0;
    while (TRUE) {

        //
        // First check if there is any disk there at all by opening partition 0
        //
        *PartitionNumber = 0;

        swprintf(NameBuffer, L"\\Device\\Harddisk%d\\Partition%d", *DiskNumber, *PartitionNumber);

        RtlInitUnicodeString(&UnicodeString, NameBuffer);

        InitializeObjectAttributes(
            &ObjectAttributes,
            &UnicodeString,
            OBJ_CASE_INSENSITIVE,
            NULL,
            NULL
            );


        Status = NtCreateFile( &Handle,
                               (ACCESS_MASK)FILE_GENERIC_READ,
                               &ObjectAttributes,
                               &IoStatus,
                               NULL,
                               FILE_ATTRIBUTE_NORMAL,
                               FILE_SHARE_READ,
                               FILE_OPEN,
                               FILE_SYNCHRONOUS_IO_NONALERT,
                               NULL,
                               0
                             );

        if (!NT_SUCCESS(Status)) {
            KdPrint(("SMSS: GetBootPartition: Harddisk%d\\Partition0 for read failed (Status 0x%x).\n", *DiskNumber, Status));
            *PartitionNumber = 1;
            *DiskNumber = 0;
            return;
        }

        NtClose(Handle);

        //
        // Now, for each partition, check if it is marked 'active'
        //
        while (TRUE) {

            *PartitionNumber = *PartitionNumber + 1;

            swprintf(NameBuffer, L"\\Device\\Harddisk%d\\Partition%d", *DiskNumber, *PartitionNumber);

            RtlInitUnicodeString(&UnicodeString, NameBuffer);

            InitializeObjectAttributes(
                &ObjectAttributes,
                &UnicodeString,
                OBJ_CASE_INSENSITIVE,
                NULL,
                NULL
                );


            Status = NtCreateFile( &Handle,
                                   (ACCESS_MASK)FILE_GENERIC_READ,
                                   &ObjectAttributes,
                                   &IoStatus,
                                   NULL,
                                   FILE_ATTRIBUTE_NORMAL,
                                   FILE_SHARE_READ,
                                   FILE_OPEN,
                                   FILE_SYNCHRONOUS_IO_NONALERT,
                                   NULL,
                                   0
                                 );

            if (!NT_SUCCESS(Status)) {
                break;
            }

            Status = NtDeviceIoControlFile(Handle,
                                           NULL,
                                           NULL,
                                           NULL,
                                           &IoStatus,
                                           IOCTL_DISK_GET_PARTITION_INFO,
                                           NULL,
                                           0,
                                           &PartitionInfo,
                                           sizeof(PARTITION_INFORMATION)
                                          );

            NtClose(Handle);

            if (!NT_SUCCESS(Status)) {
                break;
            }

            if (PartitionInfo.BootIndicator) {
                return;
            }

        }
        *DiskNumber = *DiskNumber + 1;
    }

}

VOID
SmpPartitionDisk(
    IN ULONG DiskNumber,
    OUT PULONG PartitionNumber
    )
/*++

Routine Description:

    This routine

Arguments:

    DiskNumber - The harddisk number.

    PartitionNumber - The partition number.

Return Value:

    None

--*/

{
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING UnicodeString;
    HANDLE Handle;
    IO_STATUS_BLOCK IoStatusBlock;
    PUCHAR AlignedBuffer;
    ULONG Length;
    PDRIVE_LAYOUT_INFORMATION DriveLayout;
    PDRIVE_LAYOUT_INFORMATION OrigDriveLayout;
    PPARTITION_INFORMATION Pte;
    PPARTITION_INFORMATION StartPte;
    ULONG LargestPart;
    ULONG StartPart;
    ULONG Part;
    LARGE_INTEGER LargestBlock;
    LARGE_INTEGER OffsetEnd;
    UCHAR TmpBuffer[80];
    NTSTATUS Status;
    BOOLEAN MadeChanges;
    BOOLEAN WasEnabled;

    //
    // Get the layout of the drive.
    //
    swprintf((PWSTR)TmpBuffer, L"\\Device\\Harddisk%d\\Partition0", DiskNumber);

    RtlInitUnicodeString(&UnicodeString, (PWSTR)TmpBuffer);

    InitializeObjectAttributes(
       &ObjectAttributes,
       &UnicodeString,
       OBJ_CASE_INSENSITIVE,
       NULL,
       NULL
       );


    Status = NtCreateFile( &Handle,
                           (ACCESS_MASK)FILE_GENERIC_READ,
                           &ObjectAttributes,
                           &IoStatusBlock,
                           NULL,
                           FILE_ATTRIBUTE_NORMAL,
                           FILE_SHARE_READ,
                           FILE_OPEN,
                           FILE_SYNCHRONOUS_IO_NONALERT,
                           NULL,
                           0
                         );

    if (!NT_SUCCESS(Status)) {
        KdPrint(("SMSS: Could not open Harddisk%d\\Partition0 for read (Status 0x%x).\n", DiskNumber, Status));
        return;
    }


    //
    // We really only need 4 partition numbers worth, but for debugging
    // purposes I want to see more than just the first 4, so get the first 20.
    //

    Length = sizeof(DRIVE_LAYOUT_INFORMATION) + 20 * sizeof(PARTITION_INFORMATION);

    DriveLayout = (PDRIVE_LAYOUT_INFORMATION)RtlAllocateHeap(RtlProcessHeap(),
                                                             MAKE_TAG( INIT_TAG ),
                                                             Length
                                                            );

    if (DriveLayout == NULL) {
        KdPrint(("SMSS: Could not allocate memory for drive layout (Status 0x%x).\n", Status));
        NtClose(Handle);
        return;
    }

    OrigDriveLayout = (PDRIVE_LAYOUT_INFORMATION)RtlAllocateHeap(RtlProcessHeap(),
                                                                 MAKE_TAG( INIT_TAG ),
                                                                 Length
                                                                );

    if (OrigDriveLayout == NULL) {
        KdPrint(("SMSS: Could not allocate memory for drive layout 2 (Status 0x%x).\n", Status));
        RtlFreeHeap( RtlProcessHeap(), 0, DriveLayout );
        NtClose(Handle);
        return;
    }

    Status = NtDeviceIoControlFile(
               Handle,
               NULL,
               NULL,
               NULL,
               &IoStatusBlock,
               IOCTL_DISK_GET_DRIVE_LAYOUT,
               NULL,
               0,
               (PUCHAR)DriveLayout,
               Length
               );

    if (!NT_SUCCESS(Status)) {
        KdPrint(("SMSS: Could not get drive layout (Status 0x%x).\n", Status));
        RtlFreeHeap( RtlProcessHeap(), 0, OrigDriveLayout );
        RtlFreeHeap( RtlProcessHeap(), 0, DriveLayout );
        NtClose(Handle);
        return;
    }

    memcpy(OrigDriveLayout, DriveLayout, Length);

#if DBG

    KdPrint(("SMSS:Starting drive layout\n"));
    for (Part = 0; Part < DriveLayout->PartitionCount; Part++) {

        Pte = &(DriveLayout->PartitionEntry[Part]);

        KdPrint(("SMSS: Partition: %d\n", Part + 1));
        KdPrint(("SMSS: Pte->PartitionType = 0x%x\n", Pte->PartitionType));
        KdPrint(("SMSS: Pte->StartingOffset = 0x%x\n", Pte->StartingOffset));
        KdPrint(("SMSS: Pte->PartitionLength = 0x%x\n", Pte->PartitionLength));
        KdPrint(("SMSS: Pte->HiddenSectors = 0x%x\n", Pte->HiddenSectors));
        KdPrint(("SMSS: Pte->PartitionNumber = 0x%x\n", Pte->PartitionNumber));
        KdPrint(("SMSS: Pte->BootIndicator = 0x%x\n", Pte->BootIndicator));
        KdPrint(("SMSS: Pte->RecognizedPartition = 0x%x\n\n", Pte->RecognizedPartition));

    }

#endif


    //
    // Just ignore extended partitions
    //
    DriveLayout->PartitionCount = 4;

    //
    // Go thru the partitions, and for any recognized type, label it as unused.
    //
    for (Part = 0; Part < DriveLayout->PartitionCount; Part++) {

        Pte = &(DriveLayout->PartitionEntry[Part]);

        if (!IsRecognizedPartition(Pte->PartitionType) &&
            !IsContainerPartition(Pte->PartitionType)) {
            continue;
        }

        Pte->PartitionType = PARTITION_ENTRY_UNUSED;
        Pte->BootIndicator = FALSE;
    }


#if DBG

    KdPrint(("SMSS: Layout after clearing known partitions.\n"));
    for (Part = 0; Part < DriveLayout->PartitionCount; Part++) {

        Pte = &(DriveLayout->PartitionEntry[Part]);

        KdPrint(("SMSS: Partition: %d\n", Part + 1));
        KdPrint(("SMSS: Pte->PartitionType = 0x%x\n", Pte->PartitionType));
        KdPrint(("SMSS: Pte->StartingOffset = 0x%x\n", Pte->StartingOffset));
        KdPrint(("SMSS: Pte->PartitionLength = 0x%x\n", Pte->PartitionLength));
        KdPrint(("SMSS: Pte->HiddenSectors = 0x%x\n", Pte->HiddenSectors));
        KdPrint(("SMSS: Pte->PartitionNumber = 0x%x\n", Pte->PartitionNumber));
        KdPrint(("SMSS: Pte->BootIndicator = 0x%x\n", Pte->BootIndicator));
        KdPrint(("SMSS: Pte->RecognizedPartition = 0x%x\n\n", Pte->RecognizedPartition));

    }

#endif

    //
    // Merge unused partitions that are adjacent.
    //
    for (StartPart = 0; StartPart < DriveLayout->PartitionCount; StartPart++) {

        StartPte = &(DriveLayout->PartitionEntry[StartPart]);

        if ((StartPte->PartitionType != PARTITION_ENTRY_UNUSED) ||
            RtlLargeIntegerEqualTo(StartPte->PartitionLength, RtlConvertUlongToLargeInteger(0))) {
            continue;
        }

        OffsetEnd = RtlLargeIntegerAdd(StartPte->StartingOffset, StartPte->PartitionLength);

        for (Part = 0; Part < DriveLayout->PartitionCount; Part++) {

            if (Part == StartPart) {
                continue;
            }

            Pte = &(DriveLayout->PartitionEntry[Part]);

            if (RtlLargeIntegerEqualTo(OffsetEnd, Pte->StartingOffset)) {

                //
                // Merge the blocks
                //
                StartPte->PartitionLength = RtlLargeIntegerAdd(StartPte->PartitionLength,
                                                               Pte->PartitionLength
                                                              );
                OffsetEnd = RtlLargeIntegerAdd(OffsetEnd, Pte->PartitionLength);

                Pte->PartitionType = PARTITION_ENTRY_UNUSED;
                Pte->StartingOffset = RtlConvertUlongToLargeInteger(0);
                Pte->PartitionLength = RtlConvertUlongToLargeInteger(0);
                Pte->HiddenSectors = 0;
                Pte->PartitionNumber = 0;
                Pte->BootIndicator = FALSE;
                Pte->RecognizedPartition = FALSE;
                Part = (ULONG)-1; // will get ++'d to 0 at the bottom of the loop.

            }
        }

    }

    //
    // Find the largest block that is unused.
    //

    LargestPart = 0;
    LargestBlock = RtlConvertUlongToLargeInteger(0);
    for (Part = 0; Part < DriveLayout->PartitionCount; Part++) {

        Pte = &(DriveLayout->PartitionEntry[Part]);

        if ((Pte->PartitionType == PARTITION_ENTRY_UNUSED) &&
            RtlLargeIntegerGreaterThan(Pte->PartitionLength, LargestBlock)) {
            LargestPart = Part;
            LargestBlock = Pte->PartitionLength;
        }

    }

#if DBG

    KdPrint(("SMSS: Layout after merging largest block.\n"));
    for (Part = 0; Part < DriveLayout->PartitionCount; Part++) {

        Pte = &(DriveLayout->PartitionEntry[Part]);

        KdPrint(("SMSS: Partition: %d\n", Part + 1));
        KdPrint(("SMSS: Pte->PartitionType = 0x%x\n", Pte->PartitionType));
        KdPrint(("SMSS: Pte->StartingOffset = 0x%x\n", Pte->StartingOffset));
        KdPrint(("SMSS: Pte->PartitionLength = 0x%x\n", Pte->PartitionLength));
        KdPrint(("SMSS: Pte->HiddenSectors = 0x%x\n", Pte->HiddenSectors));
        KdPrint(("SMSS: Pte->PartitionNumber = 0x%x\n", Pte->PartitionNumber));
        KdPrint(("SMSS: Pte->BootIndicator = 0x%x\n", Pte->BootIndicator));
        KdPrint(("SMSS: Pte->RecognizedPartition = 0x%x\n\n", Pte->RecognizedPartition));

    }

#endif


    //
    // Set the partition type for the new partition
    //
    DriveLayout->PartitionEntry[LargestPart].PartitionType = PARTITION_IFS;
    DriveLayout->PartitionEntry[LargestPart].BootIndicator = TRUE;

#if DBG

    KdPrint(("SMSS: Final Layout\n"));
    for (Part = 0; Part < DriveLayout->PartitionCount; Part++) {

        Pte = &(DriveLayout->PartitionEntry[Part]);

        KdPrint(("SMSS: Partition: %d\n", Part + 1));
        KdPrint(("SMSS: Pte->PartitionType = 0x%x\n", Pte->PartitionType));
        KdPrint(("SMSS: Pte->StartingOffset = 0x%x\n", Pte->StartingOffset));
        KdPrint(("SMSS: Pte->PartitionLength = 0x%x\n", Pte->PartitionLength));
        KdPrint(("SMSS: Pte->HiddenSectors = 0x%x\n", Pte->HiddenSectors));
        KdPrint(("SMSS: Pte->PartitionNumber = 0x%x\n", Pte->PartitionNumber));
        KdPrint(("SMSS: Pte->BootIndicator = 0x%x\n", Pte->BootIndicator));
        KdPrint(("SMSS: Pte->RecognizedPartition = 0x%x\n\n", Pte->RecognizedPartition));

    }

#endif


    MadeChanges = FALSE;
    for (Part = 0; Part < DriveLayout->PartitionCount; Part++) {

        if (memcmp(&(DriveLayout->PartitionEntry[Part]),
            &(OrigDriveLayout->PartitionEntry[Part]),
            sizeof(PARTITION_INFORMATION))) {
            MadeChanges = TRUE;
            break;
        }

    }

    if (MadeChanges) {

        KdPrint(("SMSS: Repartitioning disk.\n"));

        //
        // Mark partitions for rewrite.
        //

        for (Part = 0; Part < DriveLayout->PartitionCount; Part++) {
            DriveLayout->PartitionEntry[Part].RewritePartition = TRUE;
        }

        //
        // Submit IOCTL to set new partition information
        //
        Status = NtDeviceIoControlFile(
                   Handle,
                   NULL,
                   NULL,
                   NULL,
                   &IoStatusBlock,
                   IOCTL_DISK_SET_DRIVE_LAYOUT,
                   DriveLayout,
                   Length,
                   NULL,
                   0
                   );

        if (!NT_SUCCESS(Status)) {
            RtlFreeHeap( RtlProcessHeap(), 0, OrigDriveLayout );
            RtlFreeHeap( RtlProcessHeap(), 0, DriveLayout );
            NtClose(Handle);
            KdPrint(("SMSS: Could not set drive layout (Status 0x%x).\n", Status));
            return;
        }
    }

    *PartitionNumber = DriveLayout->PartitionEntry[LargestPart].PartitionNumber;

    RtlFreeHeap( RtlProcessHeap(), 0, OrigDriveLayout );
    RtlFreeHeap( RtlProcessHeap(), 0, DriveLayout );
    NtClose(Handle);
    return;
}


VOID
SmpFindCSCPartition(
    IN ULONG DiskNumber,
    OUT PULONG PartitionNumber
    )
/*++

Routine Description:

    This routine searches the each partition on each hard disk for
    one which has the CSC directory.

Arguments:

    DiskNumber - The harddisk number.

    PartitionNumber - The partition number.  Will be 0 if no CSC directory is found on the disk.

Return Value:

    None

--*/

{
    WCHAR NameBuffer[80];
    HANDLE Handle;
    NTSTATUS Status;
    IO_STATUS_BLOCK IoStatus;
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING UnicodeString;
    ULONG Part;

    Part = 0;
    *PartitionNumber = 0;
    while (TRUE) {

        Part++;

        //
        // First see if the partition exists by opening it.
        //
        swprintf(NameBuffer,
                 L"\\Device\\Harddisk%d\\Partition%d",
                 DiskNumber,
                 Part
                );

        RtlInitUnicodeString(&UnicodeString, NameBuffer);

        InitializeObjectAttributes(
            &ObjectAttributes,
            &UnicodeString,
            OBJ_CASE_INSENSITIVE,
            NULL,
            NULL
            );

        Status = NtCreateFile( &Handle,
                               (ACCESS_MASK)FILE_GENERIC_READ,
                               &ObjectAttributes,
                               &IoStatus,
                               NULL,
                               FILE_ATTRIBUTE_NORMAL,
                               FILE_SHARE_READ,
                               FILE_OPEN,
                               FILE_SYNCHRONOUS_IO_NONALERT,
                               NULL,
                               0
                             );

        if (!NT_SUCCESS(Status)) {
            return;
        }

        NtClose(Handle);

        wcscat(NameBuffer, REMOTE_BOOT_IMIRROR_PATH_W REMOTE_BOOT_CSC_SUBDIR_W);

        RtlInitUnicodeString(&UnicodeString, NameBuffer);

        InitializeObjectAttributes(
            &ObjectAttributes,
            &UnicodeString,
            OBJ_CASE_INSENSITIVE,
            NULL,
            NULL
            );

        Status = NtOpenFile(&Handle,
                            FILE_READ_DATA | SYNCHRONIZE,
                            &ObjectAttributes,
                            &IoStatus,
                            FILE_SHARE_READ,
                            FILE_DIRECTORY_FILE
                           );

        if (NT_SUCCESS(Status)) {
            NtClose(Handle);
            *PartitionNumber = Part;
            return;
        }

    }

}
#endif // defined(REMOTE_BOOT)