On Tue, Mar 18, 2025 at 8:51 PM Corinna Vinschen <corinna-cyg...@cygwin.com> wrote: > > Fodder for future Cygwin development: > > For a start I'd like to add some additions to POSIX-1.2025 which catched > my eye. Whoever wants to take a stab at some of the functionality, feel > free. > > I have noticed especially:
Copying file support via cp --reflink would be good. This is now the default for all applications which use CopyFile(), CopyFileEx(), CopyFile2() in Windows Server 2025 and Windows 11, says https://devblogs.microsoft.com/engineering-at-microsoft/copy-on-write-in-win32-api-early-access/ I did some research: Windows supports this for network drives (SMB) and local ReFS drives by default with the FSCTL_DUPLICATE_EXTENTS_TO_FILE ioctl. Cygwin therefore needs to implement fclonefileat() via FSCTL_DUPLICATE_EXTENTS_TO_FILE, make cp --reflink=always the default, and that's it. -- Internationalization&localization dev / 大阪大学 Takeshi Nishimura <takeshi.nishimura.li...@gmail.com>
