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From: Peter Chubb <peter@chubb.wattle.id.au>
To: Philippe Troin <phil@fifi.org>
Cc: Peter Chubb <peter@chubb.wattle.id.au>,
	rob@landley.net, linux-kernel@vger.kernel.org
Subject: Re: Is there a "make hole" (truncate in middle) syscall?
Date: Fri, 5 Dec 2003 13:39:14 +1100	[thread overview]
Message-ID: <16335.61394.767472.292269@wombat.chubb.wattle.id.au> (raw)
In-Reply-To: <873cc0nkgf.fsf@ceramic.fifi.org>

>>>>> "Philippe" == Philippe Troin <phil@fifi.org> writes:

Philippe> Peter Chubb <peter@chubb.wattle.id.au> writes:
>> >>>>> "Rob" == Rob Landley <rob@landley.net> writes:
>> 
Rob> You can make a file with a hole by seeking past it and never
Rob> writing to that bit, but is there any way to punch a hole in a
Rob> file after the fact?  (I mean other with lseek and write.  Having
Rob> a sparse file as the result....)
>> SVr4 has fcntl(fd, F_FREESP, flock) that frees the space covered by
>> the struct flock in the file.  Linux doesn't have this, at least in
>> the baseline kernels.

Philippe> However most SVr4 (at least Solaris and HP-UX) only
Philippe> implement FREESP when the freed space is at the file's
Philippe> tail. In other words, FREESP can only be used to implement
Philippe> ftruncate().

The original SVr4 worked in the middle of files too.


  reply	other threads:[~2003-12-05  2:39 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 [this message]
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
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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