From: Libor Vanek <lists@conet.cz>
To: Alexander Viro <viro@math.psu.edu>
Cc: Alvaro Figueroa <fede2@fuerzag.ulatina.ac.cr>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: Adding snapshot capability to Linux
Date: Tue, 23 Apr 2002 20:48:00 +0200 [thread overview]
Message-ID: <3CC5AC60.40201@conet.cz> (raw)
In-Reply-To: <Pine.GSO.4.21.0204231041010.8087-100000@weyl.math.psu.edu>
Alexander Viro wrote:
>You _can't_ get consistent snapshots without cooperation from fs. LVM,
>EVMS, whatever. Only filesystem knows what IO needs to be pushed to
>make what we have on device consistent and what IO needs to be held
>back. Neither VFS nor device driver do not and can not have such
>knowledge - it depends both on fs layout and on implementation details.
>
My idea was to "catch" functions for writing to fs (file/metadata) and
hold them till I copy file/metadata to snapshot. I thought that when
done in the correct place this could work with virtualy any "normal" fs...
Libor
next prev parent reply other threads:[~2002-04-23 18:49 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-22 10:58 Adding snapshot capability to Linux Libor Vaněk
2002-04-22 12:06 ` Peter Wächtler
2002-04-22 12:19 ` Libor Vanek
2002-04-22 12:42 ` Jasper Spaans
2002-04-22 15:02 ` Alvaro Figueroa
2002-04-23 5:36 ` rpm
2002-04-23 14:30 ` Alvaro Figueroa
2002-04-23 14:45 ` Alexander Viro
2002-04-23 14:58 ` Xavier Bestel
2002-04-23 18:48 ` Libor Vanek [this message]
2002-04-23 19:04 ` Jeremy Jackson
2002-04-23 20:22 ` Andreas Dilger
2002-04-22 17:07 ` Andreas Dilger
2002-04-22 17:41 ` Kent Borg
2002-04-22 18:39 ` Andreas Dilger
2002-04-22 18:19 ` Sandy Harris
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