From: Jamie Lokier <jamie@shareable.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Jörn Engel" <joern@wohnheim.fh-wedel.de>,
"Davide Libenzi" <davidel@xmailserver.org>,
"Patrick J. LoPresti" <patl@users.sourceforge.net>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] cowlinks v2
Date: Thu, 25 Mar 2004 17:49:42 +0000 [thread overview]
Message-ID: <20040325174942.GC11236@mail.shareable.org> (raw)
In-Reply-To: <m1y8ptu42m.fsf@ebiederm.dsl.xmission.com>
Eric W. Biederman wrote:
> Actually there is... You don't do the copy until an actual write occurs.
> Some files are opened read/write when there is simply the chance they might
> be written to so delaying the copy is generally a win.
Programs depend on the inode number returned by fstat() not changing,
and maybe in some other circumstances, even if they subsequently write
to the file.
(It's ok for open() to change the inode number, because that's
equivalent to another program changing the filesystem in parallel).
How do you handle that if COW occurs later than open()?
You could also force COW when fstat() is called, I suppose.
-- Jamie
next prev parent reply other threads:[~2004-03-25 17:49 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-20 8:34 [PATCH] cowlinks v2 Jörn Engel
2004-03-20 8:49 ` Andrew Morton
2004-03-20 11:27 ` Jörn Engel
2004-03-20 19:28 ` Andrew Morton
2004-03-21 12:43 ` Jörn Engel
2004-03-21 18:53 ` Jörn Engel
[not found] ` <mit.lcs.mail.linux-kernel/20040320083411.GA25934@wohnheim.fh-wedel.de>
2004-03-20 15:03 ` Patrick J. LoPresti
2004-03-20 15:23 ` Jörn Engel
2004-03-29 17:12 ` Pavel Machek
2004-03-29 21:05 ` Patrick J. LoPresti
2004-03-29 23:16 ` Pavel Machek
2004-03-31 14:34 ` Jamie Lokier
2004-03-31 14:45 ` Pavel Machek
2004-03-31 15:20 ` Jamie Lokier
2004-04-02 11:44 ` Tim Connors
2004-04-02 16:54 ` Jörn Engel
2004-04-02 18:01 ` Pavel Machek
2004-04-02 18:17 ` Jörn Engel
2004-04-02 18:23 ` Pavel Machek
2004-04-02 19:28 ` Ross Biro
2004-04-02 21:35 ` Pavel Machek
2004-04-05 8:12 ` Jörn Engel
2004-04-05 8:19 ` Pavel Machek
2004-04-05 8:45 ` Jörn Engel
2004-04-02 20:09 ` Jamie Lokier
2004-04-02 21:39 ` Pavel Machek
2004-04-02 22:00 ` Chris Friesen
2004-04-03 0:49 ` Jamie Lokier
2004-04-03 8:23 ` Pavel Machek
2004-04-03 13:15 ` Jamie Lokier
2004-04-05 8:19 ` Jörn Engel
2004-04-05 8:22 ` Pavel Machek
2004-04-03 0:46 ` Jamie Lokier
2004-04-03 1:04 ` Jamie Lokier
2004-04-03 1:21 ` Erik Andersen
2004-04-03 1:59 ` Jamie Lokier
2004-04-03 3:55 ` Ross Biro
2004-04-03 9:09 ` Pavel Machek
2004-04-03 13:27 ` Jamie Lokier
2004-04-03 18:39 ` Eric W. Biederman
2004-04-03 19:43 ` Jamie Lokier
2004-04-03 20:30 ` Eric W. Biederman
2004-04-03 21:59 ` Jamie Lokier
2004-04-04 8:15 ` Eric W. Biederman
2004-04-05 8:35 ` Jörn Engel
2004-04-05 9:15 ` Eric W. Biederman
2004-04-05 9:18 ` Jörn Engel
2004-04-05 11:43 ` Pavel Machek
2004-04-05 12:17 ` Jamie Lokier
2004-04-05 12:39 ` Jamie Lokier
2004-04-05 12:41 ` Jamie Lokier
2004-04-05 18:03 ` Jörn Engel
2004-04-05 11:10 ` jlnance
2004-04-05 11:46 ` Pavel Machek
2004-04-05 12:35 ` Jamie Lokier
2004-04-05 8:43 ` Jörn Engel
2004-04-03 19:47 ` Eric W. Biederman
2004-04-05 8:54 ` Jörn Engel
2004-04-05 9:07 ` Eric W. Biederman
2004-03-20 16:48 ` Davide Libenzi
2004-03-21 12:57 ` Jörn Engel
2004-03-21 17:59 ` Davide Libenzi
2004-03-21 18:14 ` Jörn Engel
2004-03-21 20:26 ` Davide Libenzi
2004-03-21 20:35 ` Jörn Engel
2004-03-22 0:18 ` Eric W. Biederman
2004-03-22 0:25 ` Davide Libenzi
2004-03-22 5:07 ` Eric W. Biederman
2004-03-22 5:11 ` Davide Libenzi
2004-03-22 11:20 ` Eric W. Biederman
2004-03-22 16:02 ` Davide Libenzi
2004-03-25 17:49 ` Jamie Lokier [this message]
2004-03-25 18:06 ` Eric W. Biederman
2004-03-25 19:43 ` Jamie Lokier
2004-03-25 20:38 ` Linus Torvalds
2004-03-25 22:16 ` Eric W. Biederman
2004-04-01 14:53 ` Jörn Engel
2004-04-02 11:54 ` Tim Connors
2004-03-25 21:46 ` Eric W. Biederman
2004-03-27 10:28 ` Jamie Lokier
2004-03-27 21:00 ` Eric W. Biederman
2004-03-27 21:42 ` Jamie Lokier
2004-03-27 23:45 ` Eric W. Biederman
2004-03-28 0:43 ` Eric W. Biederman
2004-03-28 12:22 ` Jamie Lokier
2004-03-28 20:07 ` Eric W. Biederman
2004-03-28 23:55 ` Jamie Lokier
2004-03-29 1:31 ` Eric W. Biederman
2004-03-29 12:36 ` Jamie Lokier
2004-03-29 19:36 ` Eric W. Biederman
2004-03-29 23:05 ` Jamie Lokier
2004-03-29 23:58 ` Eric W. Biederman
2004-03-29 7:45 ` Denis Vlasenko
2004-03-29 9:28 ` Pavel Machek
2004-03-29 12:40 ` Jamie Lokier
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