RASCSI/cpp/devices/storage_device.cpp

101 lines
2.3 KiB
C++

//---------------------------------------------------------------------------
//
// SCSI Target Emulator RaSCSI Reloaded
// for Raspberry Pi
//
// Copyright (C) 2022 Uwe Seimet
//
//---------------------------------------------------------------------------
#include "shared/rascsi_exceptions.h"
#include "storage_device.h"
#include <sys/stat.h>
#include <unistd.h>
#include <filesystem>
using namespace std;
using namespace filesystem;
StorageDevice::StorageDevice(PbDeviceType type, int lun) : ModePageDevice(type, lun)
{
SupportsFile(true);
SetStoppable(true);
}
void StorageDevice::ValidateFile()
{
if (blocks == 0) {
throw io_exception(string(GetTypeString()) + " device has 0 blocks");
}
if (!exists(path(filename))) {
throw file_not_found_exception("Image file '" + filename + "' for " + GetTypeString() + " device does not exist");
}
if (GetFileSize() > 2LL * 1024 * 1024 * 1024 * 1024) {
throw io_exception("Drive capacity cannot exceed 2 TiB");
}
// TODO Check for duplicate handling of these properties (-> rascsi_executor.cpp)
if (access(filename.c_str(), W_OK)) {
// Permanently write-protected
SetReadOnly(true);
SetProtectable(false);
SetProtected(false);
}
SetStopped(false);
SetRemoved(false);
SetLocked(false);
SetReady(true);
}
void StorageDevice::ReserveFile(const string& file, int id, int lun) const
{
assert(!file.empty());
assert(reserved_files.find(file) == reserved_files.end());
reserved_files[file] = make_pair(id, lun);
}
void StorageDevice::UnreserveFile()
{
reserved_files.erase(filename);
filename = "";
}
id_set StorageDevice::GetIdsForReservedFile(const string& file)
{
if (const auto& it = reserved_files.find(file); it != reserved_files.end()) {
return make_pair(it->second.first, it->second.second);
}
return make_pair(-1, -1);
}
void StorageDevice::UnreserveAll()
{
reserved_files.clear();
}
bool StorageDevice::FileExists(const string& file)
{
return exists(file);
}
bool StorageDevice::IsReadOnlyFile() const
{
return access(filename.c_str(), W_OK);
}
off_t StorageDevice::GetFileSize() const
{
// filesystem::file_size cannot be used here because gcc < 10.3.0 cannot handle more than 2 GiB
if (struct stat st; !stat(filename.c_str(), &st)) {
return st.st_size;
}
throw io_exception("Can't get size of '" + filename + "'");
}