Re: ext3 structure mapping to block device

[SandeepKsinha <sandeepksinha@xxxxxxxxx>]

Hi Ajit,

On Mon, Aug 17, 2009 at 11:06 AM, ajit mote <mail2blackmen@xxxxxxxxx> wrote:

Hello,

I would like to know how file system structures are mapped to hard disk sector. My goal is to understand how file system is created on block device and how superblocks are mapped to hard disk sectors.

http://lxr.linux.no/#linux+v2.6.30.4/include/linux/bio.h#L62

As for super blocks,
you might want to have a look at:

Generic Super block:
http://lxr.linux.no/#linux+v2.6.30.4/include/linux/fs.h#L1306

Ext3 Super block:

http://lxr.linux.no/#linux+v2.6.30.4/include/linux/ext3_fs.h#L455

These superblocks gets written to the disk sectors.

Also, if you are interested in super block operation. Then you might want took at these functions:
http://lxr.linux.no/#linux+v2.6.30.4/fs/ext3/super.c#L2986


 

I am not sure whether I stated the problem precisely or not but if I did not described it properly then let me know.

This is just an understanding sort of issue which I am looking for teaching purpose.

Note:
  Please free to change the subject line if not proper.

HTH,

 

--
Thanks & Regards,
Ajit Subhash Mote

Regards,
Sandeep.