linux-kernel - Mis-Design of Btrfs?

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Message-ID: <20110623105337.GD3753@ethz.ch>
Date:	Thu, 23 Jun 2011 12:53:37 +0200
From:	Nico Schottelius <nico-lkml-20110623@...ottelius.org>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: Mis-Design of Btrfs?

Good morning devs,

I'm wondering whether the raid- and volume-management-builtin of btrfs is
actually a sane idea or not.
Currently we do have md/device-mapper support for raid
already, btrfs lacks raid5 support and re-implements stuff that
has already been done.

I'm aware of the fact that it is very useful to know on which devices
we are in a filesystem. But I'm wondering, whether it wouldn't be
smarter to generalise the information exposure through the VFS layer
instead of replicating functionality:

Physical:   USB-HD   SSD   USB-Flash          | Exposes information to
Raid:       Raid1, Raid5, Raid10, etc.        | higher levels
Crypto:     Luks                              |
LVM:        Groups/Volumes                    |
FS:         xfs/jfs/reiser/ext3               v

Thus a filesystem like ext3 could be aware that it is running
on a USB HD, enable -o sync be default or have the filesystem
to rewrite blocks when running on crypto or optimise for an SSD, ...

Cheers,

Nico

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