linux-kernel - Re: [RFC] Rollback FS

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Message-ID: <CABjrhvpzcETE=CZrOkRgxpKhFm9-piYJLJ=8zdwnNkmJtkWRtQ@mail.gmail.com>
Date:	Sun, 20 Oct 2013 20:59:14 +0800
From:	jiaweiwei <jiaweiwei.xiyou@...il.com>
To:	"Theodore Ts'o" <tytso@....edu>,
	jiaweiwei <jiaweiwei.xiyou@...il.com>,
	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 8:35 PM, Theodore Ts'o <tytso@....edu> wrote:
> On Sun, Oct 20, 2013 at 07:37:01PM +0800, jiaweiwei wrote:
>>
>> Any file system should rollback but not specific ones. Therefore, a
>> VFS like mechanism should be designed and implemented.
>
> And what if the blocks or inodes used for the files that were deleted
> have already been used and overwritten?

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.

>
>> Maybe, I would give detail design, thanks.
>
> I encourage you to try to do that; you might find it to be an
> educational exercise.
>

Yeah, I would, thanks.


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