linux-kernel - Re: [RFC] Rollback FS

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Message-ID: <CAFLxGvwgf3dD=4Xf_JtFwPFtudRYg8RuL8Jcu5dJr3CfkdnvVg@mail.gmail.com>
Date:	Sun, 20 Oct 2013 13:46:38 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	jiaweiwei <jiaweiwei.xiyou@...il.com>
Cc:	Vyacheslav Dubeyko <slava@...eyko.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Harry Wei <harryxiyou@...il.com>
Subject: Re: [RFC] Rollback FS

On Sun, Oct 20, 2013 at 1:37 PM, jiaweiwei <jiaweiwei.xiyou@...il.com> wrote:
> On Sun, Oct 20, 2013 at 6:43 PM, Vyacheslav Dubeyko <slava@...eyko.com> wrote:
>> 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.
>>
>
> Any file system should rollback but not specific ones. Therefore, a
> VFS like mechanism should be designed and implemented.

-ENOPATCH

>> Do you really want to implement something likewise snapshot feature in a file system
>> from the scratch?
>>
>
> Maybe, I would give detail design, thanks.

Linux's next generation filesystem, btrfs, has already support for
file and volume level snapshots.

-- 
Thanks,
//richard
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