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

Anton Altaparmakov
2003-12-05T14:27:31Z

On Fri, 2003-12-05 at 11:44, viro@parcelfarce.linux.theplanet.co.uk
wrote:
> 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()...

I have no intention to provide such "make hole" functionality in the
Linux kernel NTFS driver so I don't need to... (-;

Cheers,

Anton
--
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
Linux NTFS maintainer / IRC: #ntfs on irc.freenode.net
WWW: http://linux-ntfs.sf.net/ &