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Filesystem/Win32: Recreate hardlinks on fs::pending_file

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elad335 2024-10-27 14:48:44 +02:00 committed by Elad
parent 97f2b6b701
commit 8b8396b945
1 changed files with 72 additions and 2 deletions
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74
Utilities/File.cpp
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@ -2475,7 +2475,6 @@ bool fs::pending_file::commit(bool overwrite)
{
file.sync();
}
#endif
#ifdef _WIN32
@ -2486,16 +2485,87 @@ bool fs::pending_file::commit(bool overwrite)
disp.DeleteFileW = false;
ensure(SetFileInformationByHandle(file.get_handle(), FileDispositionInfo, &disp, sizeof(disp)));
}
std::vector<std::wstring> hardlink_paths;
const auto ws1 = to_wchar(m_path);
const HANDLE file_handle = CreateFileW(ws1.get(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
while (file_handle != INVALID_HANDLE_VALUE)
{
// Get file ID (used to check for hardlinks)
BY_HANDLE_FILE_INFORMATION file_info;
if (!GetFileInformationByHandle(file_handle, &file_info) || file_info.nNumberOfLinks == 1)
{
CloseHandle(file_handle);
break;
}
// Buffer for holding link name
std::wstring link_name_buffer(MAX_PATH, wchar_t{});
DWORD buffer_size{};
HANDLE find_handle = INVALID_HANDLE_VALUE;
while (true)
{
buffer_size = static_cast<DWORD>(link_name_buffer.size() - 1);
find_handle = FindFirstFileNameW(ws1.get(), 0, &buffer_size, link_name_buffer.data());
if (find_handle != INVALID_HANDLE_VALUE || GetLastError() != ERROR_MORE_DATA)
{
break;
}
link_name_buffer.resize(buffer_size + 1);
}
if (find_handle != INVALID_HANDLE_VALUE)
{
const std::wstring_view ws1_sv = ws1.get();
while (true)
{
if (link_name_buffer.c_str() != ws1_sv)
{
// Note: link_name_buffer is a buffer which may contain zeroes so truncate it
hardlink_paths.push_back(link_name_buffer.c_str());
}
buffer_size = static_cast<DWORD>(link_name_buffer.size() - 1);
if (!FindNextFileNameW(find_handle, &buffer_size, link_name_buffer.data()))
{
if (GetLastError() != ERROR_MORE_DATA)
{
break;
}
link_name_buffer.resize(buffer_size + 1);
}
}
}
// Clean up
FindClose(find_handle);
CloseHandle(file_handle);
break;
}
#endif
file.close();
#ifdef _WIN32
const auto ws1 = to_wchar(m_path);
const auto ws2 = to_wchar(m_dest);
if (MoveFileExW(ws1.get(), ws2.get(), overwrite ? MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH : MOVEFILE_WRITE_THROUGH))
{
for (auto&& path : hardlink_paths)
{
// Recreate hard links
CreateHardLinkW(path.c_str(), ws2.get(), NULL);
}
// Disable the destructor
m_path.clear();
return true;