store a block device information in sb_infostruct of ext4 file system

Hi,
I have created an img file and mounted it with ext4 file system.
I want to store its information in sb_info str of ext4 file system ext4.h header
file.
actually i am trying to separately store metadata and the data.For doing
that i have created an img file and formatted this partition with ext4.
I need to store this partitions information in the ext4_sb_info struct.I am not
sure about
how to modify the code as i am new to this file system.



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