Re: [PATCH]: reiser4 [5/8] export remove_from_page_cache()
Ragnar Kjørstad (kernel@ragnark.vestdata.no)
Thu, 31 Oct 2002 21:17:47 +0100
On Thu, Oct 31, 2002 at 10:33:11AM -0700, Andreas Dilger wrote:
> On Oct 31, 2002 16:31 +0000, Christoph Hellwig wrote:
> > What about chaing truncate_inode_pages to take an additional len
> > argument so you don't have to remove all pages past an offset?
>
> That would be what we have been calling "punch", and is quite useful
> for putting holes in files (i.e. making them sparse again). This
> can be used for InterMezzo (among other things) so that the KML log
> file can be growing at the end, but being punched out at the start
> so it doesn't use up a lot of disk space.
It's also very useful for HSM-software (Hirarcial Storage Management).
--
Ragnar Kjørstad
Big Storage
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