linux-kernel - Re: [RFC] Rollback FS

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Message-ID: <CABjrhvomv62ww9z3_LXosWVMPCrAe7jME2NhBa4AkaZP5TQN3Q@mail.gmail.com>
Date:	Sun, 20 Oct 2013 23:22:00 +0800
From:	jiaweiwei <jiaweiwei.xiyou@...il.com>
To:	Levente Kurusa <levex@...ux.com>
Cc:	"Theodore Ts'o" <tytso@....edu>,
	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 9:26 PM, Levente Kurusa <levex@...ux.com> wrote:
> 2013-10-20 15:19 keltezéssel, jiaweiwei írta:
>> On Sun, Oct 20, 2013 at 9:07 PM, Levente Kurusa <levex@...ux.com> wrote:
>> [...]
>>>> A good catch. Following ideas would be suitable.
>>>>
>>>> 1, Keep the blocks or inodes by a parameter we give.
>>>> 2, Keep the blocks or inodes for several seconds.
>>> Keep them where? On the HDD? We just deleted/moved that.
>>
>> Delete/move a file with a parameter, which would keep the blocks or inodes
>> in-place. Or we would keep the blocks or inodes for several seconds.
>
> The problem with keeping the inodes/blocks for several seconds is
> that you would need to find a magic number that is not small enough,
> because if it is, then what if the user doesn't notice the problem
> during a long operation? If the magic number is big, then we waste a
> lot of space.
>
> The problem with the parameter thing is that again, all the different
> filesystems need to support that feature. We can't just tell Ext3 or JFFS2 on the VFS level,
> that 'Hey, keep those inodes in place incase someone just made himself some headache.'
>

Above you said are what we should do. Don't waste time, let me design and
implement it. I would send design document for review, thanks.


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