#include "stdafx.h"
#include "sys_sync.h"
#include "sys_fs.h"

#include "Emu/Cell/PPUModule.h"
#include "Emu/Cell/PPUThread.h"
#include "Crypto/unedat.h"
#include "Emu/System.h"
#include "Emu/VFS.h"
#include "Emu/IdManager.h"
#include "Utilities/StrUtil.h"

LOG_CHANNEL(sys_fs);

lv2_fs_mount_point g_mp_sys_dev_root;
lv2_fs_mount_point g_mp_sys_no_device;
lv2_fs_mount_point g_mp_sys_dev_hdd0{"/dev_hdd0"};
lv2_fs_mount_point g_mp_sys_dev_hdd1{"/dev_hdd1", 512, 32768, lv2_mp_flag::no_uid_gid + lv2_mp_flag::cache};
lv2_fs_mount_point g_mp_sys_dev_usb{"", 512, 4096, lv2_mp_flag::no_uid_gid};
lv2_fs_mount_point g_mp_sys_dev_bdvd{"", 2048, 65536, lv2_mp_flag::read_only + lv2_mp_flag::no_uid_gid};
lv2_fs_mount_point g_mp_sys_host_root{"", 512, 512, lv2_mp_flag::strict_get_block_size + lv2_mp_flag::no_uid_gid};
lv2_fs_mount_point g_mp_sys_dev_flash{"", 512, 8192, lv2_mp_flag::read_only + lv2_mp_flag::no_uid_gid};
lv2_fs_mount_point g_mp_sys_dev_flash2{ "", 512, 8192, lv2_mp_flag::no_uid_gid }; // TODO confirm
lv2_fs_mount_point g_mp_sys_dev_flash3{ "", 512, 8192, lv2_mp_flag::read_only + lv2_mp_flag::no_uid_gid }; // TODO confirm

template<>
void fmt_class_string<lv2_file>::format(std::string& out, u64 arg)
{
	const auto& file = get_object(arg);

	std::string_view type_s;
	switch (file.type)
	{
	case lv2_file_type::regular: type_s = "Regular file"; break;
	case lv2_file_type::sdata: type_s = "SDATA"; break;
	case lv2_file_type::edata: type_s = "EDATA"; break;
	}

	auto get_size = [](u64 size) -> std::string
	{
		if (size == umax)
		{
			return "N/A";
		}

		std::string size_str = fmt::format("0x%05x ", size);
		switch (std::bit_width(size) / 10 * 10)
		{
		case 64: size_str = "0"s; break;
		case 0: fmt::append(size_str, "(%u)", size); break;
		case 10: fmt::append(size_str, "(%gKB)", size / 1024.); break;
		case 20: fmt::append(size_str, "(%gMB)", size / (1024. * 1024)); break;

		default:
		case 30: fmt::append(size_str, "(%gGB)", size / (1024. * 1024 * 1024)); break;
		}
	
		return size_str;
	};

	const usz pos = file.file ? file.file.pos() : umax;
	const usz size = file.file ? file.file.size() : umax;

	fmt::append(out, u8"%s, “%s”, Mode: 0x%x, Flags: 0x%x, Pos: %s, Size: %s", type_s, file.name.data(), file.mode, file.flags, get_size(pos), get_size(size));
}

template<>
void fmt_class_string<lv2_dir>::format(std::string& out, u64 arg)
{
	const auto& dir = get_object(arg);

	fmt::append(out, u8"Directory, “%s”, Entries: %u/%u", dir.name.data(), std::min<u64>(dir.pos, dir.entries.size()), dir.entries.size());
}

bool verify_mself(const fs::file& mself_file)
{
	FsMselfHeader mself_header;
	if (!mself_file.read<FsMselfHeader>(mself_header))
	{
		sys_fs.error("verify_mself: Didn't read expected bytes for header.");
		return false;
	}

	if (mself_header.m_magic != 0x4D534600u)
	{
		sys_fs.error("verify_mself: Header magic is incorrect.");
		return false;
	}

	if (mself_header.m_format_version != 1u)
	{
		sys_fs.error("verify_mself: Unexpected header format version.");
		return false;
	}

	// sanity check
	if (mself_header.m_entry_size != sizeof(FsMselfEntry))
	{
		sys_fs.error("verify_mself: Unexpected header entry size.");
		return false;
	}

	mself_file.seek(0);

	return true;
}

lv2_fs_mount_point* lv2_fs_object::get_mp(std::string_view filename)
{
	std::string_view mp_name, vpath = filename;

	for (usz depth = 0;;)
	{
		// Skip one or more '/'
		const auto pos = vpath.find_first_not_of('/');

		if (pos == 0)
		{
			// Relative path (TODO)
			return &g_mp_sys_no_device;
		}

		if (pos == umax)
		{
			break;
		}

		// Get fragment name
		const auto name = vpath.substr(pos, vpath.find_first_of('/', pos) - pos);
		vpath.remove_prefix(name.size() + pos);

		// Process special directories
		if (name == "."sv)
		{
			// Keep current
			continue;
		}

		if (name == ".."sv)
		{
			// Root parent is root
			if (depth == 0)
			{
				continue;
			}

			depth--;
			continue;
		}

		if (depth++ == 0)
		{
			// Save mountpoint name
			mp_name = name;
		}
	}

	if (!mp_name.empty())
	{
		if (mp_name == "dev_hdd0"sv)
			return &g_mp_sys_dev_hdd0;
		if (mp_name == "dev_hdd1"sv)
			return &g_mp_sys_dev_hdd1;
		if (mp_name.starts_with("dev_usb"sv))
			return &g_mp_sys_dev_usb;
		if (mp_name == "dev_bdvd"sv)
			return &g_mp_sys_dev_bdvd;
		if (mp_name == "app_home"sv && filename.data() != Emu.argv[0].data())
			return lv2_fs_object::get_mp(Emu.argv[0]);
		if (mp_name == "host_root"sv)
			return &g_mp_sys_host_root;
		if (mp_name == "dev_flash"sv)
			return &g_mp_sys_dev_flash;
		if (mp_name == "dev_flash2"sv)
			return &g_mp_sys_dev_flash2;
		if (mp_name == "dev_flash3"sv)
			return &g_mp_sys_dev_flash3;

		// Default
		return &g_mp_sys_dev_hdd0;
	}

	// Default fallback
	return &g_mp_sys_dev_root;
}

u64 lv2_file::op_read(const fs::file& file, vm::ptr<void> buf, u64 size)
{
	// Copy data from intermediate buffer (avoid passing vm pointer to a native API)
	uchar local_buf[65536];

	u64 result = 0;

	while (result < size)
	{
		const u64 block = std::min<u64>(size - result, sizeof(local_buf));
		const u64 nread = file.read(+local_buf, block);

		std::memcpy(static_cast<uchar*>(buf.get_ptr()) + result, local_buf, nread);
		result += nread;

		if (nread < block)
		{
			break;
		}
	}

	return result;
}

u64 lv2_file::op_write(const fs::file& file, vm::cptr<void> buf, u64 size)
{
	// Copy data to intermediate buffer (avoid passing vm pointer to a native API)
	uchar local_buf[65536];

	u64 result = 0;

	while (result < size)
	{
		const u64 block = std::min<u64>(size - result, sizeof(local_buf));
		std::memcpy(local_buf, static_cast<const uchar*>(buf.get_ptr()) + result, block);
		const u64 nwrite = file.write(+local_buf, block);
		result += nwrite;

		if (nwrite < block)
		{
			break;
		}
	}

	return result;
}

struct lv2_file::file_view : fs::file_base
{
	const std::shared_ptr<lv2_file> m_file;
	const u64 m_off;
	u64 m_pos;

	explicit file_view(const std::shared_ptr<lv2_file>& _file, u64 offset)
		: m_file(_file)
		, m_off(offset)
		, m_pos(0)
	{
	}

	~file_view() override
	{
	}

	fs::stat_t stat() override
	{
		return m_file->file.stat();
	}

	bool trunc(u64) override
	{
		return false;
	}

	u64 read(void* buffer, u64 size) override
	{
		const u64 old_pos = m_file->file.pos();
		m_file->file.seek(m_off + m_pos);
		const u64 result = m_file->file.read(buffer, size);
		ensure(old_pos == m_file->file.seek(old_pos));

		m_pos += result;
		return result;
	}

	u64 write(const void*, u64) override
	{
		return 0;
	}

	u64 seek(s64 offset, fs::seek_mode whence) override
	{
		const s64 new_pos =
			whence == fs::seek_set ? offset :
			whence == fs::seek_cur ? offset + m_pos :
			whence == fs::seek_end ? offset + size() : -1;

		if (new_pos < 0)
		{
			fs::g_tls_error = fs::error::inval;
			return -1;
		}

		m_pos = new_pos;
		return m_pos;
	}

	u64 size() override
	{
		return m_file->file.size();
	}
};

fs::file lv2_file::make_view(const std::shared_ptr<lv2_file>& _file, u64 offset)
{
	fs::file result;
	result.reset(std::make_unique<lv2_file::file_view>(_file, offset));
	return result;
}

error_code sys_fs_test(ppu_thread&, u32 arg1, u32 arg2, vm::ptr<u32> arg3, u32 arg4, vm::ptr<char> buf, u32 buf_size)
{
	sys_fs.trace("sys_fs_test(arg1=0x%x, arg2=0x%x, arg3=*0x%x, arg4=0x%x, buf=*0x%x, buf_size=0x%x)", arg1, arg2, arg3, arg4, buf, buf_size);

	if (arg1 != 6 || arg2 != 0 || arg4 != sizeof(u32))
	{
		sys_fs.todo("sys_fs_test: unknown arguments (arg1=0x%x, arg2=0x%x, arg3=*0x%x, arg4=0x%x)", arg1, arg2, arg3, arg4);
	}

	if (!arg3)
	{
		return CELL_EFAULT;
	}

	const auto file = idm::get<lv2_fs_object>(*arg3);

	if (!file)
	{
		return CELL_EBADF;
	}

	for (u32 i = 0; i < buf_size; i++)
	{
		if (!(buf[i] = file->name[i]))
		{
			return CELL_OK;
		}
	}

	buf[buf_size - 1] = 0;
	return CELL_OK;
}

lv2_file::open_raw_result_t lv2_file::open_raw(const std::string& local_path, s32 flags, s32 /*mode*/, lv2_file_type type, const lv2_fs_mount_point* mp)
{
	// TODO: other checks for path

	if (fs::is_dir(local_path))
	{
		return {CELL_EISDIR};
	}

	bs_t<fs::open_mode> open_mode{};

	switch (flags & CELL_FS_O_ACCMODE)
	{
	case CELL_FS_O_RDONLY: open_mode += fs::read; break;
	case CELL_FS_O_WRONLY: open_mode += fs::write; break;
	case CELL_FS_O_RDWR: open_mode += fs::read + fs::write; break;
	default: break;
	}

	if (mp->flags & lv2_mp_flag::read_only)
	{
		if ((flags & CELL_FS_O_ACCMODE) != CELL_FS_O_RDONLY && fs::is_file(local_path))
		{
			return {CELL_EPERM};
		}
	}

	if (flags & CELL_FS_O_CREAT)
	{
		open_mode += fs::create;

		if (flags & CELL_FS_O_EXCL)
		{
			open_mode += fs::excl;
		}
	}

	if (flags & CELL_FS_O_TRUNC)
	{
		open_mode += fs::trunc;
	}

	if (flags & CELL_FS_O_MSELF)
	{
		open_mode = fs::read;
		// mself can be mself or mself | rdonly
		if (flags & ~(CELL_FS_O_MSELF | CELL_FS_O_RDONLY))
		{
			open_mode = {};
		}
	}

	if (flags & CELL_FS_O_UNK)
	{
		sys_fs.warning("lv2_file::open() called with CELL_FS_O_UNK flag enabled. FLAGS: %#o", flags);
	}

	if (mp->flags & lv2_mp_flag::read_only)
	{
		// Deactivate mutating flags on read-only FS
		open_mode = fs::read;
	}

	// Tests have shown that invalid combinations get resolved internally (without exceptions), but that would complicate code with minimal accuracy gains.
	// For example, no games are known to try and call TRUNCATE | APPEND | RW, or APPEND | READ, which currently would cause an exception.
	if (flags & ~(CELL_FS_O_UNK | CELL_FS_O_ACCMODE | CELL_FS_O_CREAT | CELL_FS_O_TRUNC | CELL_FS_O_APPEND | CELL_FS_O_EXCL | CELL_FS_O_MSELF))
	{
		open_mode = {}; // error
	}

	if ((flags & CELL_FS_O_ACCMODE) == CELL_FS_O_ACCMODE)
	{
		open_mode = {}; // error
	}

	if (!open_mode)
	{
		fmt::throw_exception("lv2_file::open_raw(): Invalid or unimplemented flags: %#o", flags);
	}

	std::lock_guard lock(mp->mutex);

	fs::file file(local_path, open_mode);

	if (!file && open_mode == fs::read && fs::g_tls_error == fs::error::noent)
	{
		// Try to gather split file (TODO)
		std::vector<fs::file> fragments;

		for (u32 i = 66600; i <= 66699; i++)
		{
			if (fs::file fragment{fmt::format("%s.%u", local_path, i)})
			{
				fragments.emplace_back(std::move(fragment));
			}
			else
			{
				break;
			}
		}

		if (!fragments.empty())
		{
			file = fs::make_gather(std::move(fragments));
		}
	}

	if (!file)
	{
		if (mp->flags & lv2_mp_flag::read_only)
		{
			// Failed to create file on read-only FS (file doesn't exist)
			if (flags & CELL_FS_O_ACCMODE && flags & CELL_FS_O_CREAT)
			{
				return {CELL_EPERM};
			}
		}

		if (open_mode & fs::excl && fs::g_tls_error == fs::error::exist)
		{
			return {CELL_EEXIST};
		}

		switch (auto error = fs::g_tls_error)
		{
		case fs::error::noent: return {CELL_ENOENT};
		default: sys_fs.error("lv2_file::open(): unknown error %s", error);
		}

		return {CELL_EIO};
	}

	if (flags & CELL_FS_O_MSELF && !verify_mself(file))
	{
		return {CELL_ENOTMSELF};
	}

	if (type >= lv2_file_type::sdata)
	{
		// check for sdata
		switch (type)
		{
		case lv2_file_type::sdata:
		{
			// check if the file has the NPD header, or else assume its not encrypted
			u32 magic;
			file.read<u32>(magic);
			file.seek(0);
			if (magic == "NPD\0"_u32)
			{
				auto sdata_file = std::make_unique<EDATADecrypter>(std::move(file));
				if (!sdata_file->ReadHeader())
				{
					return {CELL_EFSSPECIFIC};
				}

				file.reset(std::move(sdata_file));
			}

			break;
		}
		// edata
		case lv2_file_type::edata:
		{
			// check if the file has the NPD header, or else assume its not encrypted
			u32 magic;
			file.read<u32>(magic);
			file.seek(0);
			if (magic == "NPD\0"_u32)
			{
				auto& edatkeys = g_fxo->get<loaded_npdrm_keys>();
				auto sdata_file = std::make_unique<EDATADecrypter>(std::move(file), edatkeys.devKlic.load(), edatkeys.rifKey.load());
				if (!sdata_file->ReadHeader())
				{
					return {CELL_EFSSPECIFIC};
				}

				file.reset(std::move(sdata_file));
			}

			break;
		}
		default: break;
		}
	}

	return {.error = {}, .file = std::move(file)};
}

lv2_file::open_result_t lv2_file::open(std::string_view vpath, s32 flags, s32 mode, const void* arg, u64 size)
{
	if (vpath.empty())
	{
		return {CELL_ENOENT};
	}

	std::string path;
	const std::string local_path = vfs::get(vpath, nullptr, &path);

	const auto mp = lv2_fs_object::get_mp(vpath);

	if (mp == &g_mp_sys_dev_root)
	{
		return {CELL_EISDIR, path};
	}

	if (local_path.empty())
	{
		return {CELL_ENOTMOUNTED, path};
	}

	lv2_file_type type = lv2_file_type::regular;

	if (size == 8)
	{
		// see lv2_file::open_raw
		switch (*static_cast<const be_t<u64>*>(arg))
		{
		case 0x18000000010: type = lv2_file_type::sdata; break;
		case 0x2: type = lv2_file_type::edata; break;
		default:
			break;
		}
	}

	auto [error, file] = open_raw(local_path, flags, mode, type, mp);

	return {.error = error, .ppath = std::move(path), .real_path = std::move(local_path), .file = std::move(file), .type = type};
}

error_code sys_fs_open(ppu_thread& ppu, vm::cptr<char> path, s32 flags, vm::ptr<u32> fd, s32 mode, vm::cptr<void> arg, u64 size)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_open(path=%s, flags=%#o, fd=*0x%x, mode=%#o, arg=*0x%x, size=0x%llx)", path, flags, fd, mode, arg, size);

	if (!path)
		return CELL_EFAULT;

	auto [error, ppath, real, file, type] = lv2_file::open(path.get_ptr(), flags, mode, arg.get_ptr(), size);

	if (error)
	{
		if (error == CELL_EEXIST)
		{
			return not_an_error(CELL_EEXIST);
		}

		return {error, path};
	}

	if (type >= lv2_file_type::sdata)
	{
		sys_fs.warning("sys_fs_open(): NPDRM detected");

		if (const u32 id = idm::import<lv2_fs_object, lv2_file>([&ppath = ppath, &file = file, mode, flags, &real = real, &type = type]() -> std::shared_ptr<lv2_file>
		{
			if (!g_fxo->get<loaded_npdrm_keys>().npdrm_fds.try_inc(16))
			{
				return nullptr;
			}

			return std::make_shared<lv2_file>(ppath, std::move(file), mode, flags, real, type);
		}))
		{
			*fd = id;
			return CELL_OK;
		}
	}
	else if (const u32 id = idm::make<lv2_fs_object, lv2_file>(ppath, std::move(file), mode, flags, real))
	{
		*fd = id;
		return CELL_OK;
	}

	// Out of file descriptors
	return {CELL_EMFILE, path};
}

error_code sys_fs_read(ppu_thread& ppu, u32 fd, vm::ptr<void> buf, u64 nbytes, vm::ptr<u64> nread)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.trace("sys_fs_read(fd=%d, buf=*0x%x, nbytes=0x%llx, nread=*0x%x)", fd, buf, nbytes, nread);

	if (!nread)
	{
		return CELL_EFAULT;
	}

	if (!buf)
	{
		nread.try_write(0);
		return CELL_EFAULT;
	}

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file || (nbytes && file->flags & CELL_FS_O_WRONLY))
	{
		nread.try_write(0); // nread writing is allowed to fail, error code is unchanged
		return CELL_EBADF;
	}

	if (!nbytes)
	{
		// Whole function is skipped, only EBADF and EBUSY are checked
		if (file->lock == 1)
		{
			nread.try_write(0);
			return CELL_EBUSY;
		}

		*nread = 0;
		return CELL_OK;
	}

	std::lock_guard lock(file->mp->mutex);

	if (!file->file)
	{
		return CELL_EBADF;
	}

	if (file->lock == 2)
	{
		nread.try_write(0);
		return CELL_EIO;
	}

	*nread = file->op_read(buf, nbytes);

	return CELL_OK;
}

error_code sys_fs_write(ppu_thread& ppu, u32 fd, vm::cptr<void> buf, u64 nbytes, vm::ptr<u64> nwrite)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.trace("sys_fs_write(fd=%d, buf=*0x%x, nbytes=0x%llx, nwrite=*0x%x)", fd, buf, nbytes, nwrite);

	if (!nwrite)
	{
		return CELL_EFAULT;
	}

	if (!buf)
	{
		nwrite.try_write(0);
		return CELL_EFAULT;
	}

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file || (nbytes && !(file->flags & CELL_FS_O_ACCMODE)))
	{
		nwrite.try_write(0); // nwrite writing is allowed to fail, error code is unchanged
		return CELL_EBADF;
	}

	if (!nbytes)
	{
		// Whole function is skipped, only EBADF and EBUSY are checked
		if (file->lock == 1)
		{
			nwrite.try_write(0);
			return CELL_EBUSY;
		}

		*nwrite = 0;
		return CELL_OK;
	}

	if (file->mp->flags & lv2_mp_flag::read_only)
	{
		nwrite.try_write(0);
		return CELL_EROFS;
	}

	std::lock_guard lock(file->mp->mutex);

	if (!file->file)
	{
		return CELL_EBADF;
	}

	if (file->lock)
	{
		if (file->lock == 2)
		{
			nwrite.try_write(0);
			return CELL_EIO;
		}

		nwrite.try_write(0);
		return CELL_EBUSY;
	}

	if (file->flags & CELL_FS_O_APPEND)
	{
		file->file.seek(0, fs::seek_end);
	}

	*nwrite = file->op_write(buf, nbytes);

	return CELL_OK;
}

error_code sys_fs_close(ppu_thread& ppu, u32 fd)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file)
	{
		return {CELL_EBADF, fd};
	}

	{
		std::lock_guard lock(file->mp->mutex);

		if (!file->file)
		{
			return {CELL_EBADF, fd};
		}

		if (!(file->mp->flags & (lv2_mp_flag::read_only + lv2_mp_flag::cache)) && file->flags & CELL_FS_O_ACCMODE)
		{
			// Special: Ensure temporary directory for gamedata writes will remain on disk before final gamedata commitment
			file->file.sync(); // For cellGameContentPermit atomicity
		}

		// Ensure Host file handle won't be kept open after this syscall
		file->file.close();
	}

	const auto ret = idm::withdraw<lv2_fs_object, lv2_file>(fd, [&](lv2_file& _file) -> CellError
	{
		if (file.get() != std::addressof(_file))
		{
			// Other thread destroyed the object inbetween
			return CELL_EBADF;
		}

		if (_file.type >= lv2_file_type::sdata)
		{
			g_fxo->get<loaded_npdrm_keys>().npdrm_fds--;
		}

		return {};
	});

	if (!ret || ret.ret == CELL_EBADF)
	{
		return {CELL_EBADF, fd};
	}

	sys_fs.warning("sys_fs_close(fd=%u): path='%s'", fd, file->name.data());

	if (file->lock == 1)
	{
		return {CELL_EBUSY, fd};
	}

	return CELL_OK;
}

error_code sys_fs_opendir(ppu_thread& ppu, vm::cptr<char> path, vm::ptr<u32> fd)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_opendir(path=%s, fd=*0x%x)", path, fd);

	if (!path)
		return CELL_EFAULT;

	if (!path[0])
		return CELL_ENOENT;

	std::string processed_path;
	std::vector<std::string> ext;
	const std::string_view vpath = path.get_ptr();
	const std::string local_path = vfs::get(vpath, &ext, &processed_path);

	processed_path += "/";

	const auto mp = lv2_fs_object::get_mp(vpath);

	if (local_path.empty() && ext.empty())
	{
		return {CELL_ENOTMOUNTED, path};
	}

	// TODO: other checks for path

	if (fs::is_file(local_path))
	{
		return {CELL_ENOTDIR, path};
	}

	std::lock_guard lock(mp->mutex);

	const fs::dir dir(local_path);

	if (!dir)
	{
		switch (const auto error = fs::g_tls_error)
		{
		case fs::error::noent:
		{
			if (ext.empty())
			{
				return {CELL_ENOENT, path};
			}

			break;
		}
		default:
		{
			sys_fs.error("sys_fs_opendir(): unknown error %s", error);
			return {CELL_EIO, path};
		}
		}
	}

	// Build directory as a vector of entries
	std::vector<fs::dir_entry> data;

	if (dir)
	{
		// Add real directories
		while (dir.read(data.emplace_back()))
		{
			// Preprocess entries
			data.back().name = vfs::unescape(data.back().name);

			if (!data.back().is_directory && data.back().name == "."sv)
			{
				// Files hidden from emulation
				data.resize(data.size() - 1);
				continue;
			}

			// Add additional entries for split file candidates (while ends with .66600)
			while (data.back().name.ends_with(".66600"))
			{
				data.emplace_back(data.back()).name.resize(data.back().name.size() - 6);
			}
		}

		data.resize(data.size() - 1);
	}
	else
	{
		data.emplace_back().name = ".";
		data.back().is_directory = true;
		data.emplace_back().name = "..";
		data.back().is_directory = true;
	}

	// Add mount points (TODO)
	for (auto&& ex : ext)
	{
		data.emplace_back().name = std::move(ex);
		data.back().is_directory = true;
	}

	// Sort files, keeping . and ..
	std::stable_sort(data.begin() + 2, data.end(), [](const fs::dir_entry& a, const fs::dir_entry& b)
	{
		return a.name < b.name;
	});

	// Remove duplicates
	const auto last = std::unique(data.begin(), data.end(), [](const fs::dir_entry& a, const fs::dir_entry& b)
	{
		return a.name == b.name;
	});

	data.erase(last, data.end());

	if (const u32 id = idm::make<lv2_fs_object, lv2_dir>(processed_path, std::move(data)))
	{
		*fd = id;
		return CELL_OK;
	}

	// Out of file descriptors
	return CELL_EMFILE;
}

error_code sys_fs_readdir(ppu_thread& ppu, u32 fd, vm::ptr<CellFsDirent> dir, vm::ptr<u64> nread)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_readdir(fd=%d, dir=*0x%x, nread=*0x%x)", fd, dir, nread);

	const auto directory = idm::get<lv2_fs_object, lv2_dir>(fd);

	if (!directory)
	{
		return CELL_EBADF;
	}

	if (auto* info = directory->dir_read())
	{
		dir->d_type = info->is_directory ? CELL_FS_TYPE_DIRECTORY : CELL_FS_TYPE_REGULAR;
		dir->d_namlen = u8(std::min<usz>(info->name.size(), CELL_FS_MAX_FS_FILE_NAME_LENGTH));
		strcpy_trunc(dir->d_name, info->name);
		*nread = sizeof(CellFsDirent);
	}
	else
	{
		*nread = 0;
	}

	return CELL_OK;
}

error_code sys_fs_closedir(ppu_thread& ppu, u32 fd)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_closedir(fd=%d)", fd);

	if (!idm::remove<lv2_fs_object, lv2_dir>(fd))
	{
		return CELL_EBADF;
	}

	return CELL_OK;
}

error_code sys_fs_stat(ppu_thread& ppu, vm::cptr<char> path, vm::ptr<CellFsStat> sb)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_stat(path=%s, sb=*0x%x)", path, sb);

	if (!path)
		return CELL_EFAULT;

	if (!path[0])
		return CELL_ENOENT;

	const std::string_view vpath = path.get_ptr();
	const std::string local_path = vfs::get(vpath);

	const auto mp = lv2_fs_object::get_mp(vpath);

	if (mp == &g_mp_sys_dev_root)
	{
		sb->mode = CELL_FS_S_IFDIR | 0711;
		sb->uid = -1;
		sb->gid = -1;
		sb->atime = -1;
		sb->mtime = -1;
		sb->ctime = -1;
		sb->size = 258;
		sb->blksize = 512;
		return CELL_OK;
	}

	if (local_path.empty())
	{
		return {CELL_ENOTMOUNTED, path};
	}

	std::lock_guard lock(mp->mutex);

	fs::stat_t info{};

	if (!fs::stat(local_path, info))
	{
		switch (auto error = fs::g_tls_error)
		{
		case fs::error::noent:
		{
			// Try to analyse split file (TODO)
			u64 total_size = 0;

			for (u32 i = 66601; i <= 66699; i++)
			{
				if (fs::stat(fmt::format("%s.%u", local_path, i), info) && !info.is_directory)
				{
					total_size += info.size;
				}
				else
				{
					break;
				}
			}

			// Use attributes from the first fragment (consistently with sys_fs_open+fstat)
			if (fs::stat(local_path + ".66600", info) && !info.is_directory)
			{
				// Success
				info.size += total_size;
				break;
			}

			return {CELL_ENOENT, path};
		}
		default:
		{
			sys_fs.error("sys_fs_stat(): unknown error %s", error);
			return {CELL_EIO, path};
		}
		}
	}

	sb->mode = info.is_directory ? CELL_FS_S_IFDIR | 0777 : CELL_FS_S_IFREG | 0666;
	sb->uid = mp->flags & lv2_mp_flag::no_uid_gid ? -1 : 0;
	sb->gid = mp->flags & lv2_mp_flag::no_uid_gid ? -1 : 0;
	sb->atime = info.atime;
	sb->mtime = info.mtime;
	sb->ctime = info.ctime;
	sb->size = info.is_directory ? mp->block_size : info.size;
	sb->blksize = mp->block_size;

	if (mp->flags & lv2_mp_flag::read_only)
	{
		// Remove write permissions
		sb->mode &= ~0222;
	}

	return CELL_OK;
}

error_code sys_fs_fstat(ppu_thread& ppu, u32 fd, vm::ptr<CellFsStat> sb)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_fstat(fd=%d, sb=*0x%x)", fd, sb);

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file)
	{
		return CELL_EBADF;
	}

	std::lock_guard lock(file->mp->mutex);

	if (!file->file)
	{
		return CELL_EBADF;
	}

	if (file->lock == 2)
	{
		return CELL_EIO;
	}

	const fs::stat_t& info = file->file.stat();

	sb->mode = info.is_directory ? CELL_FS_S_IFDIR | 0777 : CELL_FS_S_IFREG | 0666;
	sb->uid = file->mp->flags & lv2_mp_flag::no_uid_gid ? -1 : 0;
	sb->gid = file->mp->flags & lv2_mp_flag::no_uid_gid ? -1 : 0;
	sb->atime = info.atime;
	sb->mtime = info.mtime;
	sb->ctime = info.ctime; // ctime may be incorrect
	sb->size = info.size;
	sb->blksize = file->mp->block_size;

	if (file->mp->flags & lv2_mp_flag::read_only)
	{
		// Remove write permissions
		sb->mode &= ~0222;
	}

	return CELL_OK;
}

error_code sys_fs_link(ppu_thread&, vm::cptr<char> from, vm::cptr<char> to)
{
	sys_fs.todo("sys_fs_link(from=%s, to=%s)", from, to);

	return CELL_OK;
}

error_code sys_fs_mkdir(ppu_thread& ppu, vm::cptr<char> path, s32 mode)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_mkdir(path=%s, mode=%#o)", path, mode);

	if (!path)
		return CELL_EFAULT;

	if (!path[0])
		return CELL_ENOENT;

	const std::string_view vpath = path.get_ptr();
	const std::string local_path = vfs::get(vpath);

	const auto mp = lv2_fs_object::get_mp(vpath);

	if (mp == &g_mp_sys_dev_root)
	{
		return {CELL_EEXIST, path};
	}

	if (local_path.empty())
	{
		return {CELL_ENOTMOUNTED, path};
	}

	if (mp->flags & lv2_mp_flag::read_only)
	{
		return {CELL_EROFS, path};
	}

	std::lock_guard lock(mp->mutex);

	if (!fs::create_dir(local_path))
	{
		switch (auto error = fs::g_tls_error)
		{
		case fs::error::noent: return {CELL_ENOENT, path};
		case fs::error::exist: return {CELL_EEXIST, path};
		default: sys_fs.error("sys_fs_mkdir(): unknown error %s", error);
		}

		return {CELL_EIO, path}; // ???
	}

	sys_fs.notice("sys_fs_mkdir(): directory %s created", path);
	return CELL_OK;
}

error_code sys_fs_rename(ppu_thread& ppu, vm::cptr<char> from, vm::cptr<char> to)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_rename(from=%s, to=%s)", from, to);

	const std::string_view vfrom = from.get_ptr();
	const std::string local_from = vfs::get(vfrom);

	const std::string_view vto = to.get_ptr();
	const std::string local_to = vfs::get(vto);

	const auto mp = lv2_fs_object::get_mp(vfrom);
	const auto mp_to = lv2_fs_object::get_mp(vto);

	if (mp == &g_mp_sys_dev_root || mp_to == &g_mp_sys_dev_root)
	{
		return CELL_EPERM;
	}

	if (local_from.empty() || local_to.empty())
	{
		return CELL_ENOTMOUNTED;
	}

	if (mp != mp_to)
	{
		return CELL_EXDEV;
	}

	if (mp->flags & lv2_mp_flag::read_only)
	{
		return CELL_EROFS;
	}

	// Done in vfs::host::rename
	//std::lock_guard lock(mp->mutex);

	if (!vfs::host::rename(local_from, local_to, mp, false))
	{
		switch (auto error = fs::g_tls_error)
		{
		case fs::error::noent: return {CELL_ENOENT, from};
		case fs::error::exist: return {CELL_EEXIST, to};
		default: sys_fs.error("sys_fs_rename(): unknown error %s", error);
		}

		return {CELL_EIO, from}; // ???
	}

	sys_fs.notice("sys_fs_rename(): %s renamed to %s", from, to);
	return CELL_OK;
}

error_code sys_fs_rmdir(ppu_thread& ppu, vm::cptr<char> path)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_rmdir(path=%s)", path);

	if (!path)
		return CELL_EFAULT;

	if (!path[0])
		return CELL_ENOENT;

	const std::string_view vpath = path.get_ptr();
	const std::string local_path = vfs::get(vpath);

	const auto mp = lv2_fs_object::get_mp(vpath);

	if (mp == &g_mp_sys_dev_root)
	{
		return {CELL_EPERM, path};
	}

	if (local_path.empty())
	{
		return {CELL_ENOTMOUNTED, path};
	}

	if (mp->flags & lv2_mp_flag::read_only)
	{
		return {CELL_EROFS, path};
	}

	std::lock_guard lock(mp->mutex);

	if (!fs::remove_dir(local_path))
	{
		switch (auto error = fs::g_tls_error)
		{
		case fs::error::noent: return {CELL_ENOENT, path};
		case fs::error::notempty: return {CELL_ENOTEMPTY, path};
		default: sys_fs.error("sys_fs_rmdir(): unknown error %s", error);
		}

		return {CELL_EIO, path}; // ???
	}

	sys_fs.notice("sys_fs_rmdir(): directory %s removed", path);
	return CELL_OK;
}

error_code sys_fs_unlink(ppu_thread& ppu, vm::cptr<char> path)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_unlink(path=%s)", path);

	if (!path)
		return CELL_EFAULT;

	if (!path[0])
		return CELL_ENOENT;

	const std::string_view vpath = path.get_ptr();
	const std::string local_path = vfs::get(vpath);

	const auto mp = lv2_fs_object::get_mp(vpath);

	if (mp == &g_mp_sys_dev_root)
	{
		return {CELL_EISDIR, path};
	}

	if (local_path.empty())
	{
		return {CELL_ENOTMOUNTED, path};
	}

	if (fs::is_dir(local_path))
	{
		return {CELL_EISDIR, path};
	}

	if (mp->flags & lv2_mp_flag::read_only)
	{
		return {CELL_EROFS, path};
	}

	std::lock_guard lock(mp->mutex);

	// Provide default mp root or use parent directory if not available (such as host_root)
	if (!vfs::host::unlink(local_path, vfs::get(mp->root.empty() ? vpath.substr(0, vpath.find_last_of('/')) : mp->root)))
	{
		switch (auto error = fs::g_tls_error)
		{
		case fs::error::noent: return {CELL_ENOENT, path};
		default: sys_fs.error("sys_fs_unlink(): unknown error %s", error);
		}

		return {CELL_EIO, path}; // ???
	}

	sys_fs.notice("sys_fs_unlink(): file %s deleted", path);
	return CELL_OK;
}

error_code sys_fs_access(ppu_thread&, vm::cptr<char> path, s32 mode)
{
	sys_fs.todo("sys_fs_access(path=%s, mode=%#o)", path, mode);

	return CELL_OK;
}

error_code sys_fs_fcntl(ppu_thread& ppu, u32 fd, u32 op, vm::ptr<void> _arg, u32 _size)
{
	ppu.state += cpu_flag::wait;

	sys_fs.trace("sys_fs_fcntl(fd=%d, op=0x%x, arg=*0x%x, size=0x%x)", fd, op, _arg, _size);

	switch (op)
	{
	case 0x80000004: // Unknown
	{
		if (_size > 4)
		{
			return CELL_EINVAL;
		}

		const auto arg = vm::static_ptr_cast<u32>(_arg);
		*arg = 0;
		break;
	}

	case 0x80000006: // cellFsAllocateFileAreaByFdWithInitialData
	{
		break;
	}

	case 0x80000007: // cellFsAllocateFileAreaByFdWithoutZeroFill
	{
		break;
	}

	case 0x80000008: // cellFsChangeFileSizeByFdWithoutAllocation
	{
		break;
	}

	case 0x8000000a: // cellFsReadWithOffset
	case 0x8000000b: // cellFsWriteWithOffset
	{
		lv2_obj::sleep(ppu);

		const auto arg = vm::static_ptr_cast<lv2_file_op_rw>(_arg);

		if (_size < arg.size())
		{
			return CELL_EINVAL;
		}

		const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

		if (!file)
		{
			return CELL_EBADF;
		}

		if (op == 0x8000000a && file->flags & CELL_FS_O_WRONLY)
		{
			return CELL_EBADF;
		}

		if (op == 0x8000000b && !(file->flags & CELL_FS_O_ACCMODE))
		{
			return CELL_EBADF;
		}

		if (op == 0x8000000b && file->flags & CELL_FS_O_APPEND)
		{
			return CELL_EBADF;
		}

		if (op == 0x8000000b && file->mp->flags & lv2_mp_flag::read_only)
		{
			return CELL_EROFS;
		}

		std::lock_guard lock(file->mp->mutex);

		if (!file->file)
		{
			return CELL_EBADF;
		}

		if (file->lock == 2)
		{
			return CELL_EIO;
		}

		if (op == 0x8000000b && file->lock)
		{
			return CELL_EBUSY;
		}

		const u64 old_pos = file->file.pos();
		file->file.seek(arg->offset);

		arg->out_size = op == 0x8000000a
			? file->op_read(arg->buf, arg->size)
			: file->op_write(arg->buf, arg->size);

		ensure(old_pos == file->file.seek(old_pos));

		arg->out_code = CELL_OK;
		return CELL_OK;
	}

	case 0x80000009: // cellFsSdataOpenByFd
	{
		lv2_obj::sleep(ppu);

		const auto arg = vm::static_ptr_cast<lv2_file_op_09>(_arg);

		if (_size < arg.size())
		{
			return CELL_EINVAL;
		}

		const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

		if (!file)
		{
			return CELL_EBADF;
		}

		std::lock_guard lock(file->mp->mutex);

		if (!file->file)
		{
			return CELL_EBADF;
		}

		auto sdata_file = std::make_unique<EDATADecrypter>(lv2_file::make_view(file, arg->offset));

		if (!sdata_file->ReadHeader())
		{
			return CELL_EFSSPECIFIC;
		}

		fs::file stream;
		stream.reset(std::move(sdata_file));
		if (const u32 id = idm::import<lv2_fs_object, lv2_file>([&file = *file, &stream = stream]() -> std::shared_ptr<lv2_file>
		{
			if (!g_fxo->get<loaded_npdrm_keys>().npdrm_fds.try_inc(16))
			{
				return nullptr;
			}

			return std::make_shared<lv2_file>(file, std::move(stream), file.mode, CELL_FS_O_RDONLY, file.real_path, lv2_file_type::sdata);
		}))
		{
			arg->out_code = CELL_OK;
			arg->out_fd = id;
			return CELL_OK;
		}

		// Out of file descriptors
		return CELL_EMFILE;
	}

	case 0xc0000002: // cellFsGetFreeSize (TODO)
	{
		lv2_obj::sleep(ppu);

		const auto arg = vm::static_ptr_cast<lv2_file_c0000002>(_arg);

		const auto mp = lv2_fs_object::get_mp("/dev_hdd0");

		arg->out_block_size = mp->block_size;
		arg->out_block_count = (40ull * 1024 * 1024 * 1024 - 1) / mp->block_size; // Read explanation in cellHddGameCheck
		return CELL_OK;
	}

	case 0xc0000006: // Unknown
	{
		const auto arg = vm::static_ptr_cast<lv2_file_c0000006>(_arg);

		if (arg->size != 0x20u)
		{
			sys_fs.error("sys_fs_fcntl(0xc0000006): invalid size (0x%x)", arg->size);
			break;
		}

		if (arg->_x4 != 0x10u || arg->_x8 != 0x18u)
		{
			sys_fs.error("sys_fs_fcntl(0xc0000006): invalid args (0x%x, 0x%x)", arg->_x4, arg->_x8);
			break;
		}

		// Load mountpoint (doesn't support multiple // at the start)
		std::string_view vpath{arg->name.get_ptr(), arg->name_size};

		sys_fs.notice("sys_fs_fcntl(0xc0000006): %s", vpath);

		// Check only mountpoint
		vpath = vpath.substr(0, vpath.find_first_of("/", 1));

		// Some mountpoints seem to be handled specially
		if (false)
		{
			// TODO: /dev_hdd1, /dev_usb000, /dev_flash
			//arg->out_code = CELL_OK;
			//arg->out_id = 0x1b5;
		}

		arg->out_code = CELL_ENOTSUP;
		arg->out_id = 0;
		return CELL_OK;
	}

	case 0xc0000007: // cellFsArcadeHddSerialNumber
	{
		break;
	}

	case 0xc0000008: // cellFsSetDefaultContainer, cellFsSetIoBuffer, cellFsSetIoBufferFromDefaultContainer
	{
		break;
	}

	case 0xc0000015: // Unknown
	{
		break;
	}

	case 0xc0000016: // ps2disc_8160A811
	{
		break;
	}

	case 0xc000001a: // cellFsSetDiscReadRetrySetting, 5731DF45
	{
		break;
	}

	case 0xc0000021: // 9FDBBA89
	{
		break;
	}

	case 0xe0000000: // Unknown (cellFsGetBlockSize)
	{
		break;
	}

	case 0xe0000001: // Unknown (cellFsStat)
	{
		break;
	}

	case 0xe0000003: // Unknown
	{
		break;
	}

	case 0xe0000004: // Unknown
	{
		break;
	}

	case 0xe0000005: // Unknown (cellFsMkdir)
	{
		break;
	}

	case 0xe0000006: // Unknown
	{
		break;
	}

	case 0xe0000007: // Unknown
	{
		break;
	}

	case 0xe0000008: // Unknown (cellFsAclRead)
	{
		break;
	}

	case 0xe0000009: // Unknown (cellFsAccess)
	{
		break;
	}

	case 0xe000000a: // Unknown (E3D28395)
	{
		break;
	}

	case 0xe000000b: // Unknown (cellFsRename, FF29F478)
	{
		break;
	}

	case 0xe000000c: // Unknown (cellFsTruncate)
	{
		break;
	}

	case 0xe000000d: // Unknown (cellFsUtime)
	{
		break;
	}

	case 0xe000000e: // Unknown (cellFsAclWrite)
	{
		break;
	}

	case 0xe000000f: // Unknown (cellFsChmod)
	{
		break;
	}

	case 0xe0000010: // Unknown (cellFsChown)
	{
		break;
	}

	case 0xe0000011: // Unknown
	{
		break;
	}

	case 0xe0000012: // cellFsGetDirectoryEntries
	{
		lv2_obj::sleep(ppu);

		const auto arg = vm::static_ptr_cast<lv2_file_op_dir::dir_info>(_arg);

		if (_size < arg.size())
		{
			return CELL_EINVAL;
		}

		const auto directory = idm::get<lv2_fs_object, lv2_dir>(fd);

		if (!directory)
		{
			return CELL_EBADF;
		}

		arg->_size = 0; // This write is not really useful for cellFs but do it anyways

		// NOTE: This function is actually capable of reading only one entry at a time
		if (arg->max)
		{
			std::memset(arg->ptr.get_ptr(), 0, arg->max * arg->ptr.size());

			if (auto* info = directory->dir_read())
			{
				auto& entry = arg->ptr[arg->_size++];

				entry.attribute.mode = info->is_directory ? CELL_FS_S_IFDIR | 0777 : CELL_FS_S_IFREG | 0666;
				entry.attribute.uid = directory->mp->flags & lv2_mp_flag::no_uid_gid ? -1 : 0;
				entry.attribute.gid = directory->mp->flags & lv2_mp_flag::no_uid_gid ? -1 : 0;
				entry.attribute.atime = info->atime;
				entry.attribute.mtime = info->mtime;
				entry.attribute.ctime = info->ctime;
				entry.attribute.size = info->size;
				entry.attribute.blksize = directory->mp->block_size;

				if (directory->mp->flags & lv2_mp_flag::read_only)
				{
					// Remove write permissions
					entry.attribute.mode &= ~0222;
				}

				entry.entry_name.d_type = info->is_directory ? CELL_FS_TYPE_DIRECTORY : CELL_FS_TYPE_REGULAR;
				entry.entry_name.d_namlen = u8(std::min<usz>(info->name.size(), CELL_FS_MAX_FS_FILE_NAME_LENGTH));
				strcpy_trunc(entry.entry_name.d_name, info->name);
			}
		}

		arg->_code = CELL_OK;
		return CELL_OK;
	}

	case 0xe0000015: // Unknown
	{
		break;
	}

	case 0xe0000016: // cellFsAllocateFileAreaWithInitialData
	{
		break;
	}

	case 0xe0000017: // cellFsAllocateFileAreaWithoutZeroFill
	{
		const auto arg = vm::static_ptr_cast<lv2_file_e0000017>(_arg);

		if (_size < arg->size || arg->_x4 != 0x10u || arg->_x8 != 0x20u)
		{
			return CELL_EINVAL;
		}

		arg->out_code = sys_fs_truncate(ppu, arg->file_path, arg->file_size);
		return CELL_OK;
	}

	case 0xe0000018: // cellFsChangeFileSizeWithoutAllocation
	{
		break;
	}

	case 0xe0000019: // Unknown
	{
		break;
	}

	case 0xe000001b: // Unknown
	{
		break;
	}

	case 0xe000001d: // Unknown
	{
		break;
	}

	case 0xe000001e: // Unknown
	{
		break;
	}

	case 0xe000001f: // Unknown
	{
		break;
	}

	case 0xe0000020: // Unknown
	{
		break;
	}

	case 0xe0000025: // cellFsSdataOpenWithVersion
	{
		const auto arg = vm::static_ptr_cast<lv2_file_e0000025>(_arg);

		if (arg->size != 0x30u)
		{
			sys_fs.error("sys_fs_fcntl(0xe0000025): invalid size (0x%x)", arg->size);
			break;
		}

		if (arg->_x4 != 0x10u || arg->_x8 != 0x28u)
		{
			sys_fs.error("sys_fs_fcntl(0xe0000025): invalid args (0x%x, 0x%x)", arg->_x4, arg->_x8);
			break;
		}

		std::string_view vpath{ arg->name.get_ptr(), arg->name_size };
		vpath = vpath.substr(0, vpath.find_first_of('\0'));

		sys_fs.notice("sys_fs_fcntl(0xe0000025): %s", vpath);

		be_t<u64> sdata_identifier = 0x18000000010;

		lv2_file::open_result_t result = lv2_file::open(vpath, 0, 0, &sdata_identifier, 8);

		if (result.error)
		{
			return result.error;
		}

		if (const u32 id = idm::import<lv2_fs_object, lv2_file>([&]() -> std::shared_ptr<lv2_file>
		{
			if (!g_fxo->get<loaded_npdrm_keys>().npdrm_fds.try_inc(16))
			{
				return nullptr;
			}

			return std::make_shared<lv2_file>(result.ppath, std::move(result.file), 0,  0, std::move(result.real_path), lv2_file_type::sdata);
		}))
		{
			arg->out_code = CELL_OK;
			arg->fd = id;
			return CELL_OK;
		}

		// Out of file descriptors
		return CELL_EMFILE;
	}
	}

	sys_fs.error("sys_fs_fcntl(): Unknown operation 0x%08x (fd=%d, arg=*0x%x, size=0x%x)", op, fd, _arg, _size);
	return CELL_OK;
}

error_code sys_fs_lseek(ppu_thread& ppu, u32 fd, s64 offset, s32 whence, vm::ptr<u64> pos)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.trace("sys_fs_lseek(fd=%d, offset=0x%llx, whence=0x%x, pos=*0x%x)", fd, offset, whence, pos);

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file)
	{
		return CELL_EBADF;
	}

	std::lock_guard lock(file->mp->mutex);

	if (!file->file)
	{
		return CELL_EBADF;
	}

	if (whence + 0u >= 3)
	{
		return {CELL_EINVAL, whence};
	}

	const u64 result = file->file.seek(offset, static_cast<fs::seek_mode>(whence));

	if (result == umax)
	{
		switch (auto error = fs::g_tls_error)
		{
		case fs::error::inval: return CELL_EINVAL;
		default: sys_fs.error("sys_fs_lseek(): unknown error %s", error);
		}

		return CELL_EIO; // ???
	}

	*pos = result;
	return CELL_OK;
}

error_code sys_fs_fdatasync(ppu_thread& ppu, u32 fd)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.trace("sys_fs_fdadasync(fd=%d)", fd);

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file || !(file->flags & CELL_FS_O_ACCMODE))
	{
		return CELL_EBADF;
	}

	std::lock_guard lock(file->mp->mutex);

	if (!file->file)
	{
		return CELL_EBADF;
	}

	file->file.sync();
	return CELL_OK;
}

error_code sys_fs_fsync(ppu_thread& ppu, u32 fd)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.trace("sys_fs_fsync(fd=%d)", fd);

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file || !(file->flags & CELL_FS_O_ACCMODE))
	{
		return CELL_EBADF;
	}

	std::lock_guard lock(file->mp->mutex);

	if (!file->file)
	{
		return CELL_EBADF;
	}

	file->file.sync();
	return CELL_OK;
}

error_code sys_fs_fget_block_size(ppu_thread& ppu, u32 fd, vm::ptr<u64> sector_size, vm::ptr<u64> block_size, vm::ptr<u64> arg4, vm::ptr<s32> out_flags)
{
	ppu.state += cpu_flag::wait;

	sys_fs.warning("sys_fs_fget_block_size(fd=%d, sector_size=*0x%x, block_size=*0x%x, arg4=*0x%x, out_flags=*0x%x)", fd, sector_size, block_size, arg4, out_flags);

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file)
	{
		return CELL_EBADF;
	}

	if (ppu.is_stopped())
	{
		return {};
	}

	// TODO
	*sector_size = file->mp->sector_size;
	*block_size = file->mp->block_size;
	*arg4 = file->mp->sector_size;
	*out_flags = file->flags;

	return CELL_OK;
}

error_code sys_fs_get_block_size(ppu_thread& ppu, vm::cptr<char> path, vm::ptr<u64> sector_size, vm::ptr<u64> block_size, vm::ptr<u64> arg4)
{
	ppu.state += cpu_flag::wait;

	sys_fs.warning("sys_fs_get_block_size(path=%s, sector_size=*0x%x, block_size=*0x%x, arg4=*0x%x)", path, sector_size, block_size, arg4);

	if (!path)
		return CELL_EFAULT;

	if (!path[0])
		return CELL_ENOENT;

	const std::string_view vpath = path.get_ptr();
	const std::string local_path = vfs::get(vpath);

	if (vpath.find_first_not_of('/') == umax)
	{
		return {CELL_EISDIR, path};
	}

	if (local_path.empty())
	{
		return {CELL_ENOTMOUNTED, path};
	}

	const auto mp = lv2_fs_object::get_mp(vpath);

	// It appears that /dev_hdd0 mount point is special in this function
	if (mp != &g_mp_sys_dev_hdd0 && (mp->flags & lv2_mp_flag::strict_get_block_size ? !fs::is_file(local_path) : !fs::exists(local_path)))
	{
		switch (auto error = fs::g_tls_error)
		{
		case fs::error::exist: return {CELL_EISDIR, path};
		case fs::error::noent: return {CELL_ENOENT, path};
		default: sys_fs.error("sys_fs_get_block_size(): unknown error %s", error);
		}

		return {CELL_EIO, path}; // ???
	}

	if (ppu.is_stopped())
	{
		return {};
	}

	// TODO
	*sector_size = mp->sector_size;
	*block_size = mp->block_size;
	*arg4 = mp->sector_size;

	return CELL_OK;
}

error_code sys_fs_truncate(ppu_thread& ppu, vm::cptr<char> path, u64 size)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_truncate(path=%s, size=0x%llx)", path, size);

	if (!path)
		return CELL_EFAULT;

	if (!path[0])
		return CELL_ENOENT;

	const std::string_view vpath = path.get_ptr();
	const std::string local_path = vfs::get(vpath);

	const auto mp = lv2_fs_object::get_mp(vpath);

	if (mp == &g_mp_sys_dev_root)
	{
		return {CELL_EISDIR, path};
	}

	if (local_path.empty())
	{
		return {CELL_ENOTMOUNTED, path};
	}

	if (mp->flags & lv2_mp_flag::read_only)
	{
		return {CELL_EROFS, path};
	}

	std::lock_guard lock(mp->mutex);

	if (!fs::truncate_file(local_path, size))
	{
		switch (auto error = fs::g_tls_error)
		{
		case fs::error::noent: return {CELL_ENOENT, path};
		default: sys_fs.error("sys_fs_truncate(): unknown error %s", error);
		}

		return {CELL_EIO, path}; // ???
	}

	return CELL_OK;
}

error_code sys_fs_ftruncate(ppu_thread& ppu, u32 fd, u64 size)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_ftruncate(fd=%d, size=0x%llx)", fd, size);

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file || !(file->flags & CELL_FS_O_ACCMODE))
	{
		return CELL_EBADF;
	}

	if (file->mp->flags & lv2_mp_flag::read_only)
	{
		return CELL_EROFS;
	}

	std::lock_guard lock(file->mp->mutex);

	if (!file->file)
	{
		return CELL_EBADF;
	}

	if (file->lock == 2)
	{
		return CELL_EIO;
	}

	if (file->lock)
	{
		return CELL_EBUSY;
	}

	if (!file->file.trunc(size))
	{
		switch (auto error = fs::g_tls_error)
		{
		case fs::error::ok:
		default: sys_fs.error("sys_fs_ftruncate(): unknown error %s", error);
		}

		return CELL_EIO; // ???
	}

	return CELL_OK;
}

error_code sys_fs_symbolic_link(ppu_thread&, vm::cptr<char> target, vm::cptr<char> linkpath)
{
	sys_fs.todo("sys_fs_symbolic_link(target=%s, linkpath=%s)", target, linkpath);

	return CELL_OK;
}

error_code sys_fs_chmod(ppu_thread&, vm::cptr<char> path, s32 mode)
{
	sys_fs.todo("sys_fs_chmod(path=%s, mode=%#o)", path, mode);

	return CELL_OK;
}

error_code sys_fs_chown(ppu_thread&, vm::cptr<char> path, s32 uid, s32 gid)
{
	sys_fs.todo("sys_fs_chown(path=%s, uid=%d, gid=%d)", path, uid, gid);

	return CELL_OK;
}

error_code sys_fs_disk_free(ppu_thread& ppu, vm::cptr<char> path, vm::ptr<u64> total_free, vm::ptr<u64> avail_free)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_disk_free(path=%s total_free=*0x%x avail_free=*0x%x)", path, total_free, avail_free);

	if (!path)
		return CELL_EFAULT;

	if (!path[0])
		return CELL_EINVAL;

	const std::string_view vpath = path.get_ptr();

	if (vpath == "/"sv)
	{
		return CELL_ENOTSUP;
	}

	// It seems max length is 31, and multiple / at the start aren't supported
	if (vpath.size() > CELL_FS_MAX_MP_LENGTH)
	{
		return {CELL_ENAMETOOLONG, path};
	}

	if (vpath.find_first_not_of('/') != 1)
	{
		return {CELL_EINVAL, path};
	}

	// Get only device path
	const std::string local_path = vfs::get(vpath.substr(0, vpath.find_first_of('/', 1)));

	if (local_path.empty())
	{
		return {CELL_EINVAL, path};
	}

	const auto mp = lv2_fs_object::get_mp(vpath);

	if (mp->flags & lv2_mp_flag::strict_get_block_size)
	{
		// TODO:
		return {CELL_ENOTSUP, path};
	}

	if (mp->flags & lv2_mp_flag::read_only)
	{
		// TODO: check /dev_bdvd
		*total_free = 0;
		*avail_free = 0;
		return CELL_OK;
	}

	// avail_free is the only value used by cellFsGetFreeSize
	if (mp == &g_mp_sys_dev_hdd1)
	{
		*avail_free = (1u << 31) - mp->sector_size; // 2GB (TODO: Should be the total size)
	}
	else //if (mp == &g_mp_sys_dev_hdd0)
	{
		*avail_free = (40ull * 1024 * 1024 * 1024 - mp->sector_size); // Read explanation in cellHddGameCheck
	}

	// HACK: Hopefully nothing uses this value or once at max because its hacked here:
	// The total size can change based on the size of the directory
	*total_free = *avail_free + fs::get_dir_size(local_path, mp->sector_size);

	return CELL_OK;
}

error_code sys_fs_utime(ppu_thread& ppu, vm::cptr<char> path, vm::cptr<CellFsUtimbuf> timep)
{
	ppu.state += cpu_flag::wait;
	lv2_obj::sleep(ppu);

	sys_fs.warning("sys_fs_utime(path=%s, timep=*0x%x)", path, timep);
	sys_fs.warning("** actime=%u, modtime=%u", timep->actime, timep->modtime);

	if (!path)
		return CELL_EFAULT;

	if (!path[0])
		return CELL_ENOENT;

	const std::string_view vpath = path.get_ptr();
	const std::string local_path = vfs::get(vpath);

	const auto mp = lv2_fs_object::get_mp(vpath);

	if (mp == &g_mp_sys_dev_root)
	{
		return {CELL_EISDIR, path};
	}

	if (local_path.empty())
	{
		return {CELL_ENOTMOUNTED, path};
	}

	if (mp->flags & lv2_mp_flag::read_only)
	{
		return {CELL_EROFS, path};
	}

	std::lock_guard lock(mp->mutex);

	if (!fs::utime(local_path, timep->actime, timep->modtime))
	{
		switch (auto error = fs::g_tls_error)
		{
		case fs::error::noent: return {CELL_ENOENT, path};
		default: sys_fs.error("sys_fs_utime(): unknown error %s", error);
		}

		return {CELL_EIO, path}; // ???
	}

	return CELL_OK;
}

error_code sys_fs_acl_read(ppu_thread&, vm::cptr<char> path, vm::ptr<void> ptr)
{
	sys_fs.todo("sys_fs_acl_read(path=%s, ptr=*0x%x)", path, ptr);

	return CELL_OK;
}

error_code sys_fs_acl_write(ppu_thread&, vm::cptr<char> path, vm::ptr<void> ptr)
{
	sys_fs.todo("sys_fs_acl_write(path=%s, ptr=*0x%x)", path, ptr);

	return CELL_OK;
}

error_code sys_fs_lsn_get_cda_size(ppu_thread&, u32 fd, vm::ptr<u64> ptr)
{
	sys_fs.warning("sys_fs_lsn_get_cda_size(fd=%d, ptr=*0x%x)", fd, ptr);

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file)
	{
		return CELL_EBADF;
	}

	// TODO
	*ptr = 0;
	return CELL_OK;
}

error_code sys_fs_lsn_get_cda(ppu_thread&, u32 fd, vm::ptr<void> arg2, u64 arg3, vm::ptr<u64> arg4)
{
	sys_fs.todo("sys_fs_lsn_get_cda(fd=%d, arg2=*0x%x, arg3=0x%x, arg4=*0x%x)", fd, arg2, arg3, arg4);

	return CELL_OK;
}

error_code sys_fs_lsn_lock(ppu_thread&, u32 fd)
{
	sys_fs.trace("sys_fs_lsn_lock(fd=%d)", fd);

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file)
	{
		return CELL_EBADF;
	}

	// TODO: seems to do nothing on /dev_hdd0 or /host_root
	if (file->mp == &g_mp_sys_dev_hdd0 || file->mp->flags & lv2_mp_flag::strict_get_block_size)
	{
		return CELL_OK;
	}

	file->lock.compare_and_swap(0, 1);
	return CELL_OK;
}

error_code sys_fs_lsn_unlock(ppu_thread&, u32 fd)
{
	sys_fs.trace("sys_fs_lsn_unlock(fd=%d)", fd);

	const auto file = idm::get<lv2_fs_object, lv2_file>(fd);

	if (!file)
	{
		return CELL_EBADF;
	}

	// Unlock unconditionally
	file->lock.compare_and_swap(1, 0);
	return CELL_OK;
}

error_code sys_fs_lsn_read(ppu_thread&, u32 fd, vm::cptr<void> ptr, u64 size)
{
	sys_fs.todo("sys_fs_lsn_read(fd=%d, ptr=*0x%x, size=0x%x)", fd, ptr, size);

	return CELL_OK;
}

error_code sys_fs_lsn_write(ppu_thread&, u32 fd, vm::cptr<void> ptr, u64 size)
{
	sys_fs.todo("sys_fs_lsn_write(fd=%d, ptr=*0x%x, size=0x%x)", fd, ptr, size);

	return CELL_OK;
}

error_code sys_fs_mapped_allocate(ppu_thread&, u32 fd, u64 size, vm::pptr<void> out_ptr)
{
	sys_fs.todo("sys_fs_mapped_allocate(fd=%d, arg2=0x%x, out_ptr=**0x%x)", fd, size, out_ptr);

	return CELL_OK;
}

error_code sys_fs_mapped_free(ppu_thread&, u32 fd, vm::ptr<void> ptr)
{
	sys_fs.todo("sys_fs_mapped_free(fd=%d, ptr=0x%#x)", fd, ptr);

	return CELL_OK;
}

error_code sys_fs_truncate2(ppu_thread&, u32 fd, u64 size)
{
	sys_fs.todo("sys_fs_truncate2(fd=%d, size=0x%x)", fd, size);

	return CELL_OK;
}

error_code sys_fs_get_mount_info_size(ppu_thread&, vm::ptr<u64> len)
{
	sys_fs.todo("sys_fs_get_mount_info_size(len=*0x%x)", len);

	if (!len)
	{
		return CELL_EFAULT;
	}

	*len = 0x8;

	return CELL_OK;
}

error_code sys_fs_get_mount_info(ppu_thread&, vm::ptr<CellFsMountInfo> info, u32 len, vm::ptr<u64> out_len)
{
	sys_fs.todo("sys_fs_get_mount_info(info=*0x%x, len=0x%x, out_len=*0x%x)", info, len, out_len);

	if (!out_len)
	{
		return CELL_EFAULT;
	}

	// TODO there is a case where 'something' happens if !info or len == 0
	if (!info || len == 0)
	{
		sys_fs.todo("sys_fs_get_mount_info special case TODO");
	}

	const u32 max_len = std::min<u32>(len, 8);
	*out_len = max_len;

	struct mount_info
	{
		std::string_view path, filesystem, dev_name;
		be_t<u32> unk1 = 0, unk2 = 0, unk3 = 0, unk4 = 0, unk5 = 0;
	};

	static constexpr std::array<mount_info, 8> data
	{
		mount_info{.path = "/", .filesystem = "CELL_FS_ADMINFS", .dev_name = "CELL_FS_ADMINFS:", .unk5 = 0x10000000},
		mount_info{.path = "/app_home", .filesystem = "CELL_FS_DUMMY", .dev_name = "CELL_FS_DUMMY:"},
		mount_info{.path = "/host_root", .filesystem = "CELL_FS_DUMMY", .dev_name = "CELL_FS_DUMMY:"},
		mount_info{.path = "/dev_flash", .filesystem = "CELL_FS_FAT", .dev_name = "CELL_FS_IOS:BUILTIN_FLSH1:", .unk5 = 0x10000000},
		mount_info{.path = "/dev_flash2", .filesystem = "CELL_FS_FAT", .dev_name = "CELL_FS_IOS:BUILTIN_FLSH2:"},
		mount_info{.path = "/dev_flash3", .filesystem = "CELL_FS_FAT", .dev_name = "CELL_FS_IOS:BUILTIN_FLSH3:"},
		mount_info{.path = "/dev_hdd0", .filesystem = "CELL_FS_UFS", .dev_name = "CELL_FS_UTILITY:HDD0:"},
		mount_info{.path = "/dev_bdvd", .filesystem = "CELL_FS_ISO9660", .dev_name = "CELL_FS_IOS:PATA0_BDVD_DRIVE"},
	};

	for (u32 i = 0; i < max_len; info++, i++)
	{
		strcpy_trunc(info->mount_path, data[i].path);
		strcpy_trunc(info->filesystem, data[i].filesystem);
		strcpy_trunc(info->dev_name, data[i].dev_name);
		std::memcpy(&info->unk1, &data[i].unk1, sizeof(be_t<u32>) * 5);
	}

	return CELL_OK;
}

error_code sys_fs_mount(ppu_thread&, vm::cptr<char> dev_name, vm::cptr<char> file_system, vm::cptr<char> path, s32 unk1, s32 prot, s32 unk3, vm::cptr<char> str1, u32 str_len)
{
	sys_fs.todo("sys_fs_mount(dev_name=%s, file_system=%s, path=%s, unk1=0x%x, prot=0x%x, unk3=0x%x, str1=%s, str_len=%d)", dev_name, file_system, path, unk1, prot, unk3, str1, str_len);

	return CELL_OK;
}