Re: File system query

[Dibyayan Chakraborty <dib.coolguy@xxxxxxxxx>]

Hi,

I have been following the prescribed articles and it has been a great help.

I am obviously one step closer to implementing the journaling in file system. But i didn't et the following things.

What would be the correct sequence of steps in implementing it ? is it something like this ?

1. At the time of filling super block the journal blocks are initialised.

2. If that is successfull all subsequent operations will be done using transactions. Which starts using journal_start() and journal_stop().

But thats all i could figure out.  Please help me with this.

On Tue, Jun 18, 2013 at 11:24 AM, Rohan Puri <rohan.puri15@xxxxxxxxx> wrote:

On Tue, Jun 18, 2013 at 12:19 AM, Dibyayan Chakraborty
<dib.coolguy@xxxxxxxxx> wrote:
> Hi,
> I am working on a project which requires to implement a file system with
> journaling capability.
>
> While i found a number of simple implementations of file systems , they all
> were lacking the journaling capability.
> like https://github.com/raczzoli/testfs or
> http://hi.baidu.com/yanyulou/item/e31a15f3b559ae49932af287
>
> Now that i have implemented the formating procedures for the file system i
> think the next step would be to implement super_block operations , file
> operations for the VFS.
>
> I came to know that ext3/ext4 uses a jbd interface which implements the
> journaling capability in a file system independent way. But i could not
> find any documentation or details for using the jbd interface.
>
> So, any help which points out to the specific details of jbd interface or
> any comments which might be helpful in implementing the journaling
> capability is welcome.
>
>
> --
> With Regards
> Dibyayan Chakraborty
>

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Hi Dibyayan,

Manish has written a nice article explaining jbd iinterfaces
implementation of ext3, explains in detail,

Link  http://www.linuxforums.org/articles/journalling-block-device-jbd-_1544.html

- Rohan

--
With Regards
Dibyayan Chakraborty

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