RASCSI/cpp/devices/storage_device.h

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//---------------------------------------------------------------------------
//
// SCSI Target Emulator PiSCSI
// for Raspberry Pi
//
// Copyright (C) 2022-2023 Uwe Seimet
//
// The base class for all mass storage devices with image file support
//
//---------------------------------------------------------------------------
#pragma once
#include "shared/piscsi_util.h"
#include "mode_page_device.h"
#include <unordered_map>
#include <string>
#include <filesystem>
using namespace std;
class StorageDevice : public ModePageDevice
{
public:
StorageDevice(PbDeviceType, int);
~StorageDevice() override = default;
void CleanUp() override;
virtual void Open() = 0;
string GetFilename() const { return filename.string(); }
void SetFilename(string_view);
uint64_t GetBlockCount() const { return blocks; }
void ReserveFile() const;
void UnreserveFile();
// TODO Remove this method, it is only used by the unit tests
static void UnreserveAll();
static bool FileExists(string_view);
void SetMediumChanged(bool b) { medium_changed = b; }
static auto GetReservedFiles() { return reserved_files; }
static void SetReservedFiles(const unordered_map<string, id_set, piscsi_util::StringHash, equal_to<>>& r)
{ reserved_files = r; }
static id_set GetIdsForReservedFile(const string&);
protected:
void ValidateFile();
bool IsMediumChanged() const { return medium_changed; }
void SetBlockCount(uint64_t b) { blocks = b; }
off_t GetFileSize() const;
private:
bool IsReadOnlyFile() const;
uint64_t blocks = 0;
filesystem::path filename;
bool medium_changed = false;
// The list of image files in use and the IDs and LUNs using these files
static inline unordered_map<string, id_set, piscsi_util::StringHash, equal_to<>> reserved_files;
};