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From: Claudio Martins <ctpm@rnl.ist.utl.pt>
To: linux-kernel@vger.kernel.org
Cc: "Jörn Engel" <joern@wohnheim.fh-wedel.de>,
	"Ian Kent" <raven@themaw.net>, "Carsten Otte" <cotte@freenet.de>,
	mszeredi@inf.bme.hu, herbert@13thfloor.at
Subject: Re: unionfs
Date: Mon, 15 Mar 2004 17:09:11 +0000	[thread overview]
Message-ID: <200403151709.11373.ctpm@rnl.ist.utl.pt> (raw)
In-Reply-To: <20040315161323.GD16615@wohnheim.fh-wedel.de>


On Monday 15 March 2004 16:13, Jörn Engel wrote:
> On Mon, 15 March 2004 22:35:20 +0800, Ian Kent wrote:
> > I don't understand the requirement properly. Sorry.
>
> Depends on who you ask, but imo it boils down to this:
> - Use one filesystem as backing store, usually ro.
> - Have another filesystem on top for extra functionality, usually rw
>   access.
>
> Famous example is a rw-CDROM, where writes go to hard drive and
> unchanged data is read from CDROM.  But it makes sense for other
> things as well.


  If I understand correctly this unionfs feature would also be the cleanest 
way of changing the root filesystem after using an initrd ramdisk on boot. 
Currently the pivot_root call is used to change root but that still implies a 
bit of a hack. You can read about it on this fine paper:

http://www.cis.udel.edu/~zhi/www.docshow.net/linux/ols.zip


  It's also a good read if you want to understand the linux bootloaders and 
the boot process in general.

Regards

Claudio 


  reply	other threads:[~2004-03-15 17:09 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-03-15 11:35 unionfs Carsten Otte
2004-03-15 12:19 ` unionfs Jörn Engel
2004-03-15 12:47   ` unionfs Ian Kent
2004-03-15 13:16     ` unionfs Jörn Engel
2004-03-15 14:35       ` unionfs Ian Kent
2004-03-15 16:13         ` unionfs Jörn Engel
2004-03-15 17:09           ` Claudio Martins [this message]
2004-03-15 19:22           ` unionfs Horst von Brand
2004-03-15 23:20             ` unionfs Chris Friesen
2004-03-16 16:04               ` unionfs Horst von Brand
2004-03-16 17:31                 ` unionfs Jörn Engel
2004-03-16 18:04                   ` unionfs Jörn Engel
2004-03-16 19:40                     ` unionfs Horst von Brand
2004-03-16 20:45                       ` unionfs Jörn Engel
2004-03-16 19:19                   ` unionfs Horst von Brand
2004-03-16 20:00                     ` unionfs Chris Friesen
2004-03-23  2:38                   ` unionfs Robert White
2004-03-15 23:52             ` unionfs Jörn Engel
2004-03-16 16:18               ` unionfs Horst von Brand
2004-03-16 17:10                 ` unionfs Jörn Engel
2004-03-19  9:11                   ` unionfs Jamie Lokier
2004-03-19  9:42                     ` unionfs Jörn Engel
2004-03-19  9:04                 ` unionfs Jamie Lokier
2004-03-16 19:03             ` unionfs Andy Isaacson
2004-03-15 14:37       ` unionfs Ian Kent
2004-03-15 16:15       ` unionfs Jörn Engel
  -- strict thread matches above, loose matches on Subject: below --
2004-03-08  9:52 unionfs Miklos Szeredi
2004-03-08 16:10 ` unionfs Bernd Schubert
2004-03-09  9:38   ` unionfs Miklos Szeredi
     [not found] ` <20040311151343.GA943@escher.cs.wm.edu>
2004-03-11 15:44   ` unionfs Miklos Szeredi
2004-03-14  2:33     ` unionfs Ian Kent
2004-03-14  4:20       ` unionfs Horst von Brand
2004-03-16 12:42       ` unionfs Miklos Szeredi
     [not found]     ` <20040315214207.GA26615@escher.cs.wm.edu>
2004-03-16 13:43       ` unionfs Miklos Szeredi
2004-03-12 23:37 ` unionfs Herbert Poetzl

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