From: Rob Landley <rob@landley.net>
To: Pavel Machek <pavel@ucw.cz>,
Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
Cc: "Jörn Engel" <joern@wohnheim.fh-wedel.de>,
linux-kernel@vger.kernel.org,
"Jamie Lokier" <jamie@shareable.org>,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [ANNOUNCEMENT PATCH COW] proof of concept impementation of cowlinks
Date: Wed, 12 May 2004 15:29:24 -0500 [thread overview]
Message-ID: <200405121529.26883.rob@landley.net> (raw)
In-Reply-To: <20040509215351.GA15307@atrey.karlin.mff.cuni.cz>
On Sunday 09 May 2004 16:53, Pavel Machek wrote:
> > I don't know how to handle this now. Introducing cow-inode number
> > with semantic "cowino1==cowino2 => files are cowlinked" is
> > ugly and won't deal with per-block cow. Sooner or later someone
> > will want to have per block cow. Think about cow'ing multi-gigabyte
> > database files for checkpointing/backup purposes...
>
> Well, if only block 17 is cowlink-shared between two files, I guess
> userspace does not want to know... And I think that cow-inode number
> *can* handle all other cases.
I remember somebody had a toy to find out the file block ranges (on ext2/ext3
anyway), which could detect fragmentation and holes and such. Presumably,
whatever they did would already detect per-block cowlinks, if anybody
actually cared...
Rob
next prev parent reply other threads:[~2004-05-17 19:53 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-06 13:17 [ANNOUNCEMENT PATCH COW] proof of concept impementation of cowlinks Jörn Engel
2004-05-06 13:18 ` [PATCH COW] generic_sendpage Jörn Engel
2004-05-06 13:19 ` [PATCH COW] sendfile Jörn Engel
2004-05-06 13:19 ` [PATCH COW] copyfile Jörn Engel
2004-05-06 13:20 ` [PATCH COW] lock_flags Jörn Engel
2004-05-06 13:21 ` [PATCH COW] MAD COW Jörn Engel
2004-05-08 13:45 ` [ANNOUNCEMENT PATCH COW] proof of concept impementation of cowlinks Denis Vlasenko
2004-05-08 22:10 ` Pavel Machek
2004-05-09 14:09 ` Denis Vlasenko
2004-05-09 21:53 ` Pavel Machek
2004-05-10 15:44 ` Jörn Engel
2004-05-10 15:51 ` Pavel Machek
2004-05-10 15:56 ` Jörn Engel
2004-05-12 0:26 ` Jamie Lokier
2004-05-13 10:56 ` Jörn Engel
2004-05-12 20:29 ` Rob Landley [this message]
2004-05-08 22:48 ` Pavel Machek
2004-05-10 15:53 ` Jörn Engel
2004-05-10 19:26 ` Jan Harkes
2004-05-11 10:02 ` Jörn Engel
2004-05-11 14:08 ` Jan Harkes
2004-05-11 14:18 ` Jan Harkes
2004-05-11 14:33 ` Jörn Engel
2004-05-21 23:23 ` Rob Landley
2004-05-25 22:46 ` Jan Harkes
2004-05-11 15:40 ` Steve French
2004-05-11 15:58 ` Jörn Engel
2004-05-10 5:15 ` Eric W. Biederman
2004-05-10 15:59 ` Jörn Engel
2004-05-12 16:39 ` Rob Landley
2004-05-20 13:49 ` Pavel Machek
2004-05-25 21:55 ` Rob Landley
2004-05-25 22:08 ` Pavel Machek
2004-05-25 23:16 ` Rob Landley
2004-05-26 0:16 ` Ian Stirling
2004-05-26 9:52 ` Jörn Engel
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