From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Diego Calleja <diegocg@gmail.com>
Cc: "Jeff V. Merkey" <jmerkey@wolfmountaingroup.com>,
arjan@infradead.org, zdzichu@irc.pl, helgehaf@aitel.hist.no,
sithglan@stud.uni-erlangen.de, tytso@mit.edu,
linux-kernel@vger.kernel.org
Subject: Re: ext4 features
Date: Mon, 03 Jul 2006 23:17:13 +0100 [thread overview]
Message-ID: <1151965033.16528.28.camel@localhost.localdomain> (raw)
In-Reply-To: <20060703232547.2d54ab9b.diegocg@gmail.com>
Ar Llu, 2006-07-03 am 23:25 +0200, ysgrifennodd Diego Calleja:
> > Add a salvagable file system to ext4, i.e. when a file is deleted, you
> > just rename it and move it to a directory called DELETED.SAV and recycle
> > the files as people allocate new ones. Easy to do (internal "mv" of
>
>
> Easily doable in userspace, why bother with kernel programming
To get the semantics you need and avoid rewriting all of user space. At
the moment some GNU apps support this type of stuff but its not in the
core libraries so it isn't generalised.
There are some big problems with "deleted" however and doing it in
kernel space. A lot of programs just overwrite data. You would have to
look for things like O_TRUNC on a file open and ftruncate.
The ftruncate case is particularly ugly because there are programs that
do lots of ftruncate calls as they run and don't neccessarily
"overwrite" data but are merely trimming logs or database files.
To add to the fun the 'old' file needs to be the one which ends up with
a new inode number and the like.
Alan
next prev parent reply other threads:[~2006-07-03 22:00 UTC|newest]
Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-01 16:33 ext4 features Thomas Glanzmann
2006-07-01 17:07 ` Tomasz Torcz
2006-07-01 17:47 ` Thomas Glanzmann
2006-07-01 18:09 ` Claudio Martins
2006-07-01 18:59 ` Thomas Glanzmann
2006-07-01 18:17 ` Tomasz Torcz
2006-07-03 9:44 ` Gabor Gombas
2006-07-03 20:22 ` Helge Hafting
2006-07-03 20:55 ` Tomasz Torcz
2006-07-03 21:01 ` Arjan van de Ven
2006-07-03 21:46 ` Jeff V. Merkey
2006-07-03 21:25 ` Diego Calleja
2006-07-03 22:17 ` Alan Cox [this message]
2006-07-04 14:45 ` Jan Engelhardt
2006-07-04 16:35 ` Jeffrey V. Merkey
2006-07-04 18:52 ` Jeff Garzik
2006-07-04 19:40 ` Jeffrey V. Merkey
2006-07-05 13:35 ` Lew Palm
2006-07-03 23:01 ` Jeff V. Merkey
2006-07-04 9:14 ` Benny Amorsen
2006-07-05 4:21 ` Bill Davidsen
2006-07-05 5:13 ` H. Peter Anvin
2006-07-05 5:45 ` Jeffrey V. Merkey
2006-07-07 14:12 ` Pavel Machek
2006-07-05 10:38 ` Krzysztof Halasa
2006-07-07 14:10 ` Pavel Machek
2006-07-07 17:45 ` Krzysztof Halasa
2006-07-07 21:30 ` Pavel Machek
2006-07-08 10:52 ` Krzysztof Halasa
2006-07-08 10:55 ` Pavel Machek
2006-07-08 11:19 ` Krzysztof Halasa
2006-07-08 11:23 ` Pavel Machek
2006-07-08 18:45 ` Avi Kivity
2006-07-08 20:24 ` Krzysztof Halasa
2006-07-04 9:22 ` Petr Tesarik
2006-07-04 11:35 ` Peter Zijlstra
2006-07-04 11:55 ` ext4 features (salvage) Petr Tesarik
[not found] ` <80294dc60607040508l1022d164ybe0ba10858e54f0c@mail.gmail.com>
2006-07-04 12:31 ` Petr Tesarik
2006-07-04 12:42 ` Helge Hafting
2006-07-04 16:20 ` Matthew Frost
2006-07-04 15:25 ` ext4 features Pavel Machek
2006-07-05 4:10 ` Bill Davidsen
2006-07-03 21:46 ` Valdis.Kletnieks
[not found] ` <Pine.LNX.4.61.0607032354170.31747@yvahk01.tjqt.qr>
2006-07-04 14:37 ` Kernel recycler [was: ext4 features] Jan Engelhardt
2006-07-04 11:14 ` ext4 features Krzysztof Halasa
2006-07-04 22:35 ` Frank van Maarseveen
2006-07-04 23:47 ` Claudio Martins
2006-07-03 22:12 ` Alan Cox
2006-07-03 21:59 ` Arjan van de Ven
2006-07-03 23:31 ` ext4 features (checksums) Neil Brown
2006-07-04 1:03 ` Jeff Garzik
2006-07-04 6:09 ` Avi Kivity
2006-07-04 7:02 ` Neil Brown
2006-07-04 8:26 ` Avi Kivity
2006-07-05 11:56 ` Bill Davidsen
2006-07-05 12:06 ` Bill Davidsen
2006-07-05 12:19 ` Avi Kivity
2006-07-08 17:54 ` Bill Davidsen
2006-07-04 8:17 ` Alan Cox
2006-07-04 11:08 ` Thomas Glanzmann
2006-07-04 11:19 ` Krzysztof Halasa
2006-07-04 12:49 ` Helge Hafting
2006-07-05 12:01 ` Bill Davidsen
2006-07-05 12:10 ` Avi Kivity
2006-07-08 18:02 ` Bill Davidsen
2006-07-06 0:36 ` Blatant layering violations (was Re: ext4 features) Valerie Henson
2006-07-06 12:15 ` Xavier Bestel
2006-07-06 17:06 ` Valdis.Kletnieks
2006-07-06 20:02 ` Tom Vier
2006-07-03 21:34 ` ext4 features Bill Davidsen
2006-07-03 21:50 ` Valdis.Kletnieks
2006-07-03 22:04 ` Bruce Ferrell
2006-07-04 14:48 ` Valdis.Kletnieks
2006-07-03 23:00 ` Bill Davidsen
2006-07-04 15:01 ` Valdis.Kletnieks
2006-07-05 2:40 ` Bill Davidsen
2006-07-05 2:47 ` Valdis.Kletnieks
2006-07-04 12:52 ` Helge Hafting
2006-07-06 15:12 ` Ric Wheeler
2006-07-06 17:05 ` Krzysztof Halasa
2006-07-06 17:27 ` Ric Wheeler
2006-07-06 20:52 ` Valdis.Kletnieks
2006-07-07 17:41 ` Krzysztof Halasa
2006-07-07 17:34 ` Krzysztof Halasa
2006-07-04 1:02 ` Theodore Tso
2006-07-04 19:16 ` Thomas Glanzmann
2006-07-04 19:30 ` Valdis.Kletnieks
2006-07-05 12:24 ` Bill Davidsen
2006-07-05 12:59 ` J. Bruce Fields
2006-07-05 13:17 ` Pádraig Brady
2006-07-05 19:33 ` Trond Myklebust
2006-07-05 21:22 ` Bill Davidsen
2006-07-05 21:42 ` Trond Myklebust
2006-07-08 21:04 ` Bill Davidsen
2006-07-10 20:08 ` Trond Myklebust
2006-07-10 22:37 ` Bill Davidsen
2006-07-11 2:36 ` Trond Myklebust
2006-07-21 3:10 ` Bill Davidsen
2006-07-21 12:06 ` Trond Myklebust
2006-07-21 14:36 ` Theodore Tso
2006-07-21 19:02 ` Trond Myklebust
2006-07-22 12:25 ` Theodore Tso
2006-07-05 21:12 ` Bill Davidsen
2006-07-05 21:27 ` linux-os (Dick Johnson)
2006-07-05 21:41 ` J. Bruce Fields
2006-07-06 2:32 ` Bill Davidsen
2006-07-06 2:42 ` Nigel Cunningham
2006-07-06 12:43 ` Trond Myklebust
2006-07-07 2:15 ` Bill Davidsen
2006-07-07 2:30 ` Trond Myklebust
2006-07-07 2:42 ` Ric Wheeler
2006-07-07 2:46 ` Trond Myklebust
2006-07-07 3:16 ` Bill Davidsen
2006-07-07 8:09 ` Bernd Petrovitsch
2006-07-07 14:56 ` Trond Myklebust
2006-07-07 19:52 ` Theodore Tso
2006-07-05 14:04 ` Avi Kivity
2006-07-04 14:36 ` Andi Kleen
2006-07-04 14:43 ` Thomas Glanzmann
[not found] <6tVcC-1e1-79@gated-at.bofh.it>
[not found] ` <6tVcC-1e1-81@gated-at.bofh.it>
[not found] ` <6tVcC-1e1-83@gated-at.bofh.it>
[not found] ` <6tWib-2Ly-7@gated-at.bofh.it>
[not found] ` <6uDdv-7bs-3@gated-at.bofh.it>
[not found] ` <6uDGF-7Nj-47@gated-at.bofh.it>
[not found] ` <6uDQb-8e8-9@gated-at.bofh.it>
[not found] ` <6uDQb-8e8-13@gated-at.bofh.it>
[not found] ` <6uE9y-d1-1@gated-at.bofh.it>
[not found] ` <6uPom-87W-23@gated-at.bofh.it>
2006-07-04 12:28 ` Bodo Eggert
2006-07-04 15:32 ` Valdis.Kletnieks
[not found] ` <6uEMp-1gr-41@gated-at.bofh.it>
[not found] ` <6uUo2-6SN-5@gated-at.bofh.it>
[not found] ` <6uW6v-15i-19@gated-at.bofh.it>
[not found] ` <6vfLY-4K5-33@gated-at.bofh.it>
2006-07-05 22:40 ` Bodo Eggert
[not found] ` <6uXYv-3RG-1@gated-at.bofh.it>
[not found] ` <6veG8-350-7@gated-at.bofh.it>
[not found] ` <6vfiU-465-13@gated-at.bofh.it>
[not found] ` <6vmNk-77r-23@gated-at.bofh.it>
[not found] ` <6vnq7-7Tw-55@gated-at.bofh.it>
[not found] ` <6vrN0-5Se-9@gated-at.bofh.it>
[not found] ` <6vBsY-38p-9@gated-at.bofh.it>
2006-07-07 9:38 ` Bodo Eggert
2006-07-07 14:37 ` Trond Myklebust
2006-07-09 9:50 ` Bodo Eggert
-- strict thread matches above, loose matches on Subject: below --
2006-07-08 2:22 Chuck Ebbert
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