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From: Anton Altaparmakov <aia21@cam.ac.uk>
To: Andy Isaacson <adi@hexapodia.org>
Cc: Rob Landley <rob@landley.net>, linux-kernel@vger.kernel.org
Subject: Re: Is there a "make hole" (truncate in middle) syscall?
Date: Fri, 5 Dec 2003 11:22:01 +0000 (GMT)	[thread overview]
Message-ID: <Pine.SOL.4.58.0312051119240.9902@green.csi.cam.ac.uk> (raw)
In-Reply-To: <20031204172348.A14054@hexapodia.org>

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).

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 / IRC: #ntfs on irc.freenode.net
WWW: http://linux-ntfs.sf.net/ & http://www-stu.christs.cam.ac.uk/~aia21/

  parent reply	other threads:[~2003-12-05 11:22 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-12-04 20:32 Is there a "make hole" (truncate in middle) syscall? Rob Landley
2003-12-04 20:55 ` Måns Rullgård
2003-12-04 21:10 ` Szakacsits Szabolcs
2003-12-05  0:02   ` Rob Landley
2003-12-04 22:33     ` Szakacsits Szabolcs
2003-12-05 11:22     ` Helge Hafting
2003-12-05 12:11   ` Måns Rullgård
2003-12-05 22:41     ` Mike Fedyk
2003-12-05 23:25       ` Måns Rullgård
2003-12-05 23:33       ` Szakacsits Szabolcs
2003-12-05 23:25     ` Szakacsits Szabolcs
2003-12-04 21:48 ` Mike Fedyk
2003-12-04 23:59   ` Rob Landley
2003-12-05 22:42     ` Olaf Titz
2003-12-04 22:53 ` Peter Chubb
2003-12-05  1:04   ` Philippe Troin
2003-12-05  2:39     ` Peter Chubb
2003-12-08  4:03     ` bill davidsen
2003-12-04 23:23 ` Andy Isaacson
2003-12-04 23:42   ` Szakacsits Szabolcs
2003-12-05  2:03     ` Mike Fedyk
2003-12-05  7:09       ` Ville Herva
2003-12-05 11:22   ` Anton Altaparmakov [this message]
2003-12-05 11:44     ` viro
2003-12-05 14:27       ` Anton Altaparmakov
2003-12-05 21:00   ` sparse file performance (was Re: Is there a "make hole" (truncate in middle) syscall?) Andy Isaacson
2003-12-05 21:12     ` Linus Torvalds
2003-12-08 20:43       ` Andy Isaacson
2003-12-11  5:13 ` Is there a "make hole" (truncate in middle) syscall? Hua Zhong
2003-12-11  6:19   ` Rob Landley
2003-12-11 18:58   ` Andy Isaacson
2003-12-11 19:15     ` Hua Zhong
2003-12-11 19:43       ` Andreas Dilger
2003-12-12 21:37         ` Daniel Phillips
2003-12-11 19:48       ` Jörn Engel
2003-12-11 19:55         ` Hua Zhong
2003-12-11 19:58         ` Andy Isaacson
2003-12-12 12:18           ` Jörn Engel
2003-12-12 15:40             ` Andy Isaacson
2003-12-12 16:03               ` Jörn Engel
2003-12-11 20:32         ` Rob Landley
2003-12-12 12:55           ` Jörn Engel
2003-12-12 13:28             ` Vladimir Saveliev
2003-12-12 13:43               ` Jörn Engel
2003-12-12 13:52                 ` Vladimir Saveliev
2003-12-12 14:04                   ` Jörn Engel
2003-12-12 13:53               ` Rob Landley
2003-12-12 14:01                 ` Vladimir Saveliev
2003-12-12 21:35                   ` Rob Landley
2003-12-15 10:00                     ` Vladimir Saveliev
2003-12-15 11:52                       ` Rob Landley
2003-12-15 13:26                         ` Jörn Engel
2003-12-12 13:39             ` Rob Landley
2003-12-12 13:56               ` Jörn Engel
2003-12-12 14:24                 ` Jörn Engel
2003-12-12 21:37                   ` Rob Landley
2003-12-15 12:47                     ` Jörn Engel
2003-12-16  5:43                       ` Rob Landley
2003-12-16 11:05                         ` Jörn Engel

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