As for UnionFS, will it be used in Moblin with btrfs+squashFS later? 

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Arjan 
van de Ven
Sent: 2009年9月25日 14:34
To: Olsen, Alan R
Cc: [email protected]
Subject: Re: [Moblin Dev] will moblin ever be able to use ext4?

Olsen, Alan R wrote:
> Ext4 would not be difficult to add. Ext4 is a rather young filesystem, so 
> there has not been a big rush to adopt it.

that has not been Moblin's motivation.
We did not see enough value in it to change to it.
BTRFS has this extra value that makes it interesting to us.


> UnionFS used to be a part of the builds as well.  It was very useful in 
> adding "reset to factory default" to the filesystem.  (The way you make it 
> work is you have a base partition that is marked read only and another added 
> on top of that one with read/write. Any additions get written to the second 
> partition. If things get messed up you just nuke the second partition and 
> things are reset back to start.)

it hasn't been part of Moblin 2.0


> Hopefully btrfs will stabilize soon. It looks very promising. Not certain how 
> much overhead there is to make it work. Might be a wee bit of overkill on a 
> handheld device.  

If Moblin switches to it, we'll switch to it for all types of devices.
Right now things look very good in that area, we haven't found a showstopper 
yet...
The switch isn't for the upcoming 2.1 release, but for the Q1/2010 releasse.


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