Re: Is there a "make hole" (truncate in middle) syscall?

viro
2003-12-05T11:44:04Z

On Fri, Dec 05, 2003 at 11:22:01AM +0000, Anton Altaparmakov wrote:
> On Thu, 4 Dec 2003, Andy Isaacson wrote:
> > On Thu, Dec 04, 2003 at 02:32:23PM -0600, Rob Landley wrote:
> > I'm curious -- does NTFS implement sparse files? Does the Win32 API
> > provide any way to manipulate them? Does the NT kernel have any sparse
> > file handling?
>
> Yes it does. The new NTFS Linux driver has full support for sparse files
> as does Windows of course.
>
> Windows does provide a function which is just "make hole". It takes
> starting offset and length (or was it ending offset instead of length,
> can't remember) and makes this sparse (obviously aligning to cluster
> boundaries, etc).

Have fun getting it to play nice with mmap()...