Re: How to print Superblock(ext2) data

[Vineet Agarwal <checkout.vineet@xxxxxxxxx>]

Hello Mahesh,

On Wed, Oct 21, 2009 at 1:24 PM, mahesh sobale <msobale007@xxxxxxxxx> wrote:

HI,
 
     I am new to kernelnewbies. I am trying to print meta data in kernel space for superblock.
for that i have to fire ioctl and write char device driver(This part i know),
    
     But i don't know how create loop device and mount ext2 file system on that and then print
superblock info. 

You can create loop devices

first create a file either using dd which would act like a loop device

second find the available loop device by
losetup -f

then following this command you can create a loop device 
    losetup <loop_device> <file_name>

create a file system on the loop device
mke2fs <loop_device>

mount -t ext2 <loop_device> <mountpoint>

using tune2fs or even debugfs u can get superblock info

tune2fs -l <loop_device>

or

debugfs <loop_device>

followed by stats
 

     Can anybody help on this.

Thanx.....
Mahesh.

-- 
Regards:
Vineet Agarwal