Re: [RFC] add FIEMAP ioctl to efficiently map file allocation

[Anton Altaparmakov <aia21@xxxxxxxxx>]

On 2 May 2007, at 09:23, Anton Altaparmakov wrote:
> On 1 May 2007, at 23:30, Andreas Dilger wrote:
>
> > On May 01, 2007  14:22 +1000, David Chinner wrote:
> > > On Mon, Apr 30, 2007 at 04:44:01PM -0600, Andreas Dilger wrote:
> > > > Hmm, I'd thought "offline" would migrate to EXTENT_UNKNOWN, but  
> > > > I didn't
> > > I disagree - why would you want to indicate the state is unknown  
> > > when we know
> > > very well that it is offline?
> > If you don't like "UNKNOWN", what about "UNMAPPED"?  I just want a
> > catch-all flag that indicates "this extent contains data but there is
> > nothing sensible to be returned for the extent mapping."
> I like UNMAPPED.  I even use it in NTFS internally for extents maps  
> that have not been read into memory yet.  (-:
Oops, I use NOT_MAPPED in NTFS rather than UNMAPPED but I still like  
UNMAPPED, too.  (-:
Best regards,

        Anton
--
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
Linux NTFS maintainer, http://www.linux-ntfs.org/