Function Ext2QueryDirectory

Ext4Fsd/dirctl.c:522–1024

NTSTATUS
Ext2QueryDirectory (IN PEXT2_IRP_CONTEXT IrpContext)
{
    PDEVICE_OBJECT          DeviceObject;
    NTSTATUS                Status = STATUS_UNSUCCESSFUL;
    PEXT2_VCB               Vcb = NULL;
    PFILE_OBJECT            FileObject = NULL;
    PEXT2_FCB               Fcb = NULL;
    PEXT2_MCB               Mcb = NULL;
    PEXT2_CCB               Ccb = NULL;
    PIRP                    Irp = NULL;
    PIO_STACK_LOCATION      IoStackLocation = NULL;

    ULONG                   Length;
    ULONG                   FileIndex;
    PUNICODE_STRING         FileName;
    PUCHAR                  Buffer;

    BOOLEAN                 RestartScan;
    BOOLEAN                 ReturnSingleEntry;
    BOOLEAN                 IndexSpecified;
    BOOLEAN                 FirstQuery;
    BOOLEAN                 FcbResourceAcquired = FALSE;

    USHORT                  NameLen;
    FILE_INFORMATION_CLASS  fi;

    OEM_STRING              Oem = { 0 };
    UNICODE_STRING          Unicode = { 0 };
    PEXT2_DIR_ENTRY2        pDir = NULL;

    ULONG                   ByteOffset;
    ULONG                   RecLen = 0;
    ULONG                   EntrySize = 0;

    EXT2_FILLDIR_CONTEXT    fc = { 0 };

    __try {

        ASSERT(IrpContext);
        ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
               (IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));

        DeviceObject = IrpContext->DeviceObject;

        //
        // This request is not allowed on the main device object
        //
        if (IsExt2FsDevice(DeviceObject)) {
            Status = STATUS_INVALID_DEVICE_REQUEST;
            __leave;
        }

        Vcb = (PEXT2_VCB) DeviceObject->DeviceExtension;
        ASSERT(Vcb != NULL);
        ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
               (Vcb->Identifier.Size == sizeof(EXT2_VCB)));