Date: Fri, 18 Nov 2005 17:42:27 +0100
From: Ragnar =?iso-8859-15?Q?Kj=F8rstad?= <kernel@ragnark.vestdata.no>
To: Pavel Machek <pavel@suse.cz>
Cc: Andrew Morton <akpm@osdl.org>, Badari Pulavarty <pbadari@us.ibm.com>,
       andrea@suse.de, hugh@veritas.com, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org
Subject: Re: [RFC] sys_punchhole()
Message-ID: <20051118164227.GA14697@vestdata.no>
References: <1131664994.25354.36.camel@localhost.localdomain> <20051110153254.5dde61c5.akpm@osdl.org> <20051113150906.GA2193@spitz.ucw.cz>
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On Sun, Nov 13, 2005 at 03:09:06PM +0000, Pavel Machek wrote:
> > > We discussed this in madvise(REMOVE) thread - to add support 
> > > for sys_punchhole(fd, offset, len) to complete the functionality
> > > (in the future).
> > > 
> > > http://marc.theaimsgroup.com/?l=linux-mm&m=113036713810002&w=2
> > > 
> > > What I am wondering is, should I invest time now to do it ?
> > 
> > I haven't even heard anyone mention a need for this in the past 1-2 years.
> 
> Some database people wanted it maybe month ago. It was replaced by some 
> madvise hack...


sys_punchhole is also potentially very useful for Hirarchial Storage
Management. (Holes are typically used for data that have been migrated
to tape).


-- 
Ragnar Kj?rstad
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