[RFC] Log-structured File System for Linux that Supports Snapshots

[RFC] Log-structured File System for Linux that Supports Snapshots

[Pradeep Padala]

Hello,
    For past two months, I have been working on developing a 
log-structured file system (LFS) that supports snapshots as a part of 
the Google Summer of Code (SoC) [1] program. The motivation and goals 
for the project are described in my SoC proposal [2].
    In the current state, LFS is quite usable (all the basic fs 
operations are working), and a working cleaner is also available. 
However, it's not yet ready for the heavy iron and I need to sort out a 
few issues. I hope to include it in the mainline, and I will release a 
set of patches later for reviewing.
    Instructions on compiling and using the stable and development 
versions from CVS are available at [3]. The bleeding edge version 
includes basic snapshotting framework.
    The project website is http://logfs.sourceforge.net, and a mailing 
list [4] is available for discussion.
    Comments are welcome.

Thanks,
-- 
Pradeep Padala
http://ppadala.blogspot.com

[1] http://code.google.com/summerofcode.html
[2] http://logfs.sourceforge.net/lfs.pdf
[3] http://logfs.sourceforge.net/compiling.html
[4] http://lists.sourceforge.net/lists/listinfo/logfs-devel

Re: [RFC] Log-structured File System for Linux that Supports Snapshots

[amagai]

Hello Pradeep,

> For past two months, I have been working on developing a
> log-structured file system (LFS) that supports snapshots as a part o

We are also developing an LFS for Linux 2.6, named Nilfs (a new
implementation of a log-structured file system).  We implemented Nilfs
using modern technology, for example, file and inode blocks are
managed by B-trees, internal data is processed in 64 bit wide word
size.  The Nilfs also supports snapshots.  The snapshots are
automatically hold without any explicit requests, the can be mounted
as a read-only file system. 

However, cleaner functions are under development.

The Nilfs will be available soon as open source software under GPL.
Could you cooperate with us on Linux LFSes!

Thank you!

AMAGAI Yoshiji
Nippon Telegraph and Telephone Corporation
NTT Cyber Space Laboratories
Open Source Software Computing Project
Kernel Team

nilfs@osrg.net

Re: [RFC] Log-structured File System for Linux that Supports Snapshots

[Pradeep Padala]

>>For past two months, I have been working on developing a
>>log-structured file system (LFS) that supports snapshots as a part o
> 
> 
> We are also developing an LFS for Linux 2.6, named Nilfs (a new
> implementation of a log-structured file system).  We implemented Nilfs
> using modern technology, for example, file and inode blocks are
> managed by B-trees, internal data is processed in 64 bit wide word
> size.  The Nilfs also supports snapshots.  The snapshots are
> automatically hold without any explicit requests, the can be mounted
> as a read-only file system. 
> However, cleaner functions are under development.
>
> The Nilfs will be available soon as open source software under GPL.
> Could you cooperate with us on Linux LFSes!

Sure, do you have any web site for the project? A simple google search 
didn't yield anything.

-- 
Pradeep Padala
http://ppadala.blogspot.com

Re: [RFC] Log-structured File System for Linux that Supports Snapshots

[amagai]

Hello,

> Sure, do you have any web site for the project? A simple google search 
> didn't yield anything.

Web site (www.osrg.net) will be opened soon, following the procedure
of our company...

AMAGAI Yoshiji
Nippon Telegraph and Telephone Corporation
NTT Cyber Space Laboratories
Open Source Software Computing Project
Kernel Team

nilfs@osrg.net