On Sun, Jan 5, 2025 at 1:06 PM Václav Haisman via Cygwin <cygwin@cygwin.com> wrote: > > On 05. 01. 25 7:31, Cedric Blancher via Cygwin wrote: > > Good morning! > > > > Could Cygwin implement copy_file_range() support, including sparse > > file support so holes are preserved, and > > FSCTL_DUPLICATE_EXTENTS_TO_FILE support? > > In theory, this could be used to implement that function. In practice, > the block cloning is only supported by ReFS. See > <https://learn.microsoft.com/en-us/windows/win32/api/winioctl/ni-winioctl-fsctl_duplicate_extents_to_file>
All Windows Server (2019, 2022) installations we have. and those which I know about, use ReFS (except in cases where Alternate Streams are required). AFAIK SMB3 also support FSCTL_DUPLICATE_EXTENTS_TO_FILE, so this would be a HUGE win for Cygwin -- Internationalization&localization dev / 大阪大学 Takeshi Nishimura <takeshi.nishimura.li...@gmail.com> -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
