RASCSI/cpp/devices/storage_device.h

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//---------------------------------------------------------------------------
//
// SCSI Target Emulator PiSCSI
// for Raspberry Pi
//
// Copyright (C) 2022 Uwe Seimet
//
// The base class for all mass storage devices with image file support
//
//---------------------------------------------------------------------------
#pragma once
#include "mode_page_device.h"
#include <unordered_map>
#include <string>
using namespace std;
using id_set = pair<int, int>;
class StorageDevice : public ModePageDevice
{
public:
StorageDevice(PbDeviceType, int);
~StorageDevice() override = default;
virtual void Open() = 0;
string GetFilename() const { return filename; }
void SetFilename(string_view f) { filename = f; }
uint64_t GetBlockCount() const { return blocks; }
void ReserveFile(const string&, int, int) const;
void UnreserveFile();
static void UnreserveAll();
static bool FileExists(const string&);
bool IsReadOnlyFile() const;
void SetMediumChanged(bool b) { medium_changed = b; }
static unordered_map<string, id_set> GetReservedFiles() { return reserved_files; }
static void SetReservedFiles(const unordered_map<string, id_set>& 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:
// Total number of blocks
uint64_t blocks = 0;
string 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> reserved_files;
};