On Fri, Jan 24, 2014 at 02:16:02AM +0000, Rodrigo Campos wrote:
> On Fri, Jan 24, 2014 at 01:00:55AM +0000, Pádraig Brady wrote:
> > On 01/23/2014 09:28 PM, Rodrigo Campos wrote:
> > > I've written a small simple tool to make a file sparse without using extra disk
> > > space, it just digs holes on the file when possible.
Nice idea.
> > > To dig the hole uses the
> > > Linux-specific fallocate(2) syscall with FALLOC_FL_PUNCH_HOLE. So, also, it only
> > > works on some file-systems.
> > >
> > > Do you think that util-linux would be a good place for such a simple, linux-only
> > > program ? The case I see it can be useful is to use on VM images file backed (or
> > > I wrote it with this in mind, at least :)).
> > >
> > This functionality is useful.
> > Would it be possible to just add to fallocate with --punch-hole=sparse or something?
>
> Totally, that's an option too :)
It would be the best way for util-linux, I really don't want to add
another util for fallocate.
Maybe we can use a new option --dig-holes [ --length <size> ] or so.
> > Also dd has the conv=sparse option, so maybe this functionality can be added there.
IMHO would be possible to add this functionality to both places ;-)
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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