linux-kernel - Re: [RFC] Rollback FS

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Date:	Sun, 20 Oct 2013 14:43:15 +0400
From:	Vyacheslav Dubeyko <slava@...eyko.com>
To:	jiaweiwei <jiaweiwei.xiyou@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Harry Wei <harryxiyou@...il.com>
Subject: Re: [RFC] Rollback FS


On Oct 20, 2013, at 11:06 AM, jiaweiwei wrote:

> Hi all,
> 
> Recently, I just do some stupid stuffs as follows.
> 
> # mv /lib/x86_64-linux-gnu/libc.so.6  /tmp
> 
> After move "/lib/x86_64-linux-gnu/libc.so.6" away, you could not run lots
> of commands, which show you some errors like this.
> 
> # ls
> ls: error while loading shared libraries: libc.so.6: cannot open
> shared object file: No such file or directory
> # mv
> mv: error while loading shared libraries: libc.so.6: cannot open
> shared object file: No such file or directory
> ...
> 
> Because they all depend on libc.so.
> 
> You could also happen to above boring stuffs when you remove some key
> files in Linux OS. Now, I have a good idea to solve above problems.
> 
> We could implement a File System to record all the operations which
> send to VFS. Then when you think you have done a mistake command, you
> could rollback from this File System.
> 
> This is just a RFC, I would give detail implementations. Would anyone
> please give me some suggestions? Thanks very much.

Anyway, you need to use Copy-On-Write (COW) approach for such file system.
But there are file systems that implements snapshot approach yet: NILFS2, ext3cow,
Next3, and so on.

Do you really want to implement something likewise snapshot feature in a file system
from the scratch?

With the best regards,
Vyacheslav Dubeyko.

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