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https://github.com/akuker/RASCSI.git
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a985fc83e4
Implements the mandatory and a few optional commands for tandberd see https://bitsavers.org/pdf/tandbergData/TDC4100/6047-1_TDC-4100_SCSI-2_Interface_Functional_Specification_Aug1991.pdf for more info. Fixed #480
105 lines
2.8 KiB
C++
105 lines
2.8 KiB
C++
//---------------------------------------------------------------------------
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//
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// SCSI Target Emulator PiSCSI
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// for Raspberry Pi
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//
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// Copyright (C) 2022-2023 Uwe Seimet
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//
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// The base class for all mass storage devices with image file support
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//
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//---------------------------------------------------------------------------
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#pragma once
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#include "shared/piscsi_util.h"
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#include "mode_page_device.h"
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#include <unordered_map>
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#include <string>
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#include <filesystem>
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using namespace std;
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class StorageDevice : public ModePageDevice
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{
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public:
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StorageDevice(PbDeviceType, int, const unordered_set<uint32_t>&);
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~StorageDevice() override = default;
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bool Init(const param_map&) override;
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void CleanUp() override;
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virtual void Open() = 0;
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string GetFilename() const { return filename.string(); }
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void SetFilename(string_view);
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uint64_t GetBlockCount() const { return blocks; }
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void ReserveFile() const;
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void UnreserveFile();
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// TODO Remove this method, it is only used by the unit tests
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static void UnreserveAll();
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static bool FileExists(string_view);
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void SetMediumChanged(bool b) { medium_changed = b; }
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static auto GetReservedFiles() { return reserved_files; }
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static void SetReservedFiles(const unordered_map<string, id_set, piscsi_util::StringHash, equal_to<>>& r)
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{ reserved_files = r; }
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static id_set GetIdsForReservedFile(const string&);
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static uint32_t CalculateShiftCount(uint32_t);
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uint32_t GetSectorSizeInBytes() const;
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void SetSectorSizeInBytes(uint32_t);
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const auto& GetSupportedSectorSizes() const { return supported_sector_sizes; }
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uint32_t GetMinSupportedSectorSize() const;
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uint32_t GetMaxSupportedSectorSize() const;
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unordered_set<uint32_t> GetSectorSizes() const;
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uint32_t GetSectorSizeShiftCount() const { return size_shift_count; }
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void SetSectorSizeShiftCount(uint32_t count) { size_shift_count = count; }
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uint32_t GetConfiguredSectorSize() const;
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virtual void Write(span<const uint8_t>, uint64_t) = 0;
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virtual int Read(span<uint8_t> , uint64_t) = 0;
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protected:
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void ValidateFile();
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bool IsMediumChanged() const { return medium_changed; }
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void SetBlockCount(uint64_t b) { blocks = b; }
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off_t GetFileSize() const;
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protected:
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// Sector size shift count (9=512, 10=1024, 11=2048, 12=4096)
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uint32_t size_shift_count = 0;
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unordered_set<uint32_t> supported_sector_sizes;
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static inline const unordered_map<uint32_t, uint32_t> shift_counts =
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{ { 512, 9 }, { 1024, 10 }, { 2048, 11 }, { 4096, 12 } };
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uint32_t configured_sector_size = 0;
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private:
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void PreventAllowMediumRemoval();
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private:
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bool IsReadOnlyFile() const;
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uint64_t blocks = 0;
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filesystem::path filename;
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bool medium_changed = false;
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// The list of image files in use and the IDs and LUNs using these files
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static inline unordered_map<string, id_set, piscsi_util::StringHash, equal_to<>> reserved_files;
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};
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