Re: Adding snapshot capability to Linux

[rpm]

On Monday 22 April 2002 05:36 pm, Peter Wächtler wrote:
> Libor Vaněk wrote:
> > Hi,
> > I'm going to start my dissertation work which is "Adding snapshop
> > capability to Linux kernel with copy-on-write support". My idea is add
> > it as another VFS - I know that there is some snapshot support in LVM
> > but it's working on "device-level" and I'd like/have to do it on fs
> > level.
> 

Instead of changing VFS you can probably make a generic stackable FS module 
.....that can stack on top of the physical filesystems  and happily take 
snapshots at "FS" level :) ! and you can use the FIST to create a basic 
stackable FS and then modify it to take care of snapshoting ! ( the good part 
is it can work on scores of other OSs like solaris , freeBSD etc ) 
i created one for ext2 but then it was not genric enough to work for other FS 
! 

cheers,
rpm