From: "Hua Zhong" <hzhong@cisco.com>
To: "'J鰎n Engel'" <joern@wohnheim.fh-wedel.de>
Cc: "'Andy Isaacson'" <adi@hexapodia.org>, <linux-kernel@vger.kernel.org>
Subject: RE: Is there a "make hole" (truncate in middle) syscall?
Date: Thu, 11 Dec 2003 11:55:13 -0800 [thread overview]
Message-ID: <018201c3c020$b0bf7650$d43147ab@amer.cisco.com> (raw)
In-Reply-To: <20031211194815.GA10029@wohnheim.fh-wedel.de>
> > Understood. Two filesystems we are using: tmpfs and ext3. For the
> > former, fragmentation doesn't matter.
> >
> > Hey, I think when I get some cycles I can try to implement this for
> > tmpfs (since it's simpler) myself, and post a patch. :-) But before
> > that, I want to make sure it's doable.
>
> If you really do it, please don't add a syscall for it. Simply check
> each written page if it is completely filled with zero. (This will be
> a very quick check for most pages, as they will contain something
> nonzero in the first couple of words)
You mean automatically punch it?
I don't think this is desirable. As someone else pointed out, "punch" might be an expensive operation and cause fragmentation (since you return the block in the middle to the fs).
I think this operation should be performed only when the application requires it.
> Jörn
next prev parent reply other threads:[~2003-12-11 19:55 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
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 [this message]
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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