mirror of https://github.com/akuker/RASCSI.git
101 lines
2.3 KiB
C++
101 lines
2.3 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 Uwe Seimet
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//
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//---------------------------------------------------------------------------
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#include "shared/piscsi_exceptions.h"
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#include "storage_device.h"
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#include <sys/stat.h>
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#include <unistd.h>
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#include <filesystem>
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using namespace std;
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using namespace filesystem;
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StorageDevice::StorageDevice(PbDeviceType type, int lun) : ModePageDevice(type, lun)
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{
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SupportsFile(true);
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SetStoppable(true);
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}
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void StorageDevice::ValidateFile()
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{
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if (blocks == 0) {
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throw io_exception(string(GetTypeString()) + " device has 0 blocks");
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}
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if (!exists(path(filename))) {
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throw file_not_found_exception("Image file '" + filename + "' for " + GetTypeString() + " device does not exist");
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}
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if (GetFileSize() > 2LL * 1024 * 1024 * 1024 * 1024) {
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throw io_exception("Drive capacity cannot exceed 2 TiB");
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}
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// TODO Check for duplicate handling of these properties (-> piscsi_executor.cpp)
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if (access(filename.c_str(), W_OK)) {
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// Permanently write-protected
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SetReadOnly(true);
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SetProtectable(false);
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SetProtected(false);
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}
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SetStopped(false);
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SetRemoved(false);
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SetLocked(false);
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SetReady(true);
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}
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void StorageDevice::ReserveFile(const string& file, int id, int lun) const
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{
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assert(!file.empty());
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assert(reserved_files.find(file) == reserved_files.end());
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reserved_files[file] = make_pair(id, lun);
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}
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void StorageDevice::UnreserveFile()
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{
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reserved_files.erase(filename);
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filename = "";
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}
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id_set StorageDevice::GetIdsForReservedFile(const string& file)
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{
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if (const auto& it = reserved_files.find(file); it != reserved_files.end()) {
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return make_pair(it->second.first, it->second.second);
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}
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return make_pair(-1, -1);
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}
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void StorageDevice::UnreserveAll()
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{
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reserved_files.clear();
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}
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bool StorageDevice::FileExists(const string& file)
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{
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return exists(file);
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}
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bool StorageDevice::IsReadOnlyFile() const
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{
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return access(filename.c_str(), W_OK);
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}
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off_t StorageDevice::GetFileSize() const
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{
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// filesystem::file_size cannot be used here because gcc < 10.3.0 cannot handle more than 2 GiB
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if (struct stat st; !stat(filename.c_str(), &st)) {
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return st.st_size;
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}
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throw io_exception("Can't get size of '" + filename + "'");
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}
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