How can I read superblock(ext2, ext3)'s information?

["이지은" <eazee@lge.com>]

Hello,
I'd like to read superblock's information on Redhat 7.3,
but I don't know how to do it.

For example, 
  Input : "/dev/sdj2"
  Output : ext2_super_block struct's s_wtime
           (I saw it at "/usr/include/ext2fs/ext2_fs.h")

  Input : "/dev/sdj1"
  Output : ext3_super_block struct's s_wtime
           (I saw it at "/usr/include/linux/ext3_fs.h")

Please give me an answer...





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