linux-ext4 - Type of filesystem block

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Date:	Sun, 24 Mar 2013 22:05:12 +0530
From:	Subranshu Patel <spatel.ml@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: Type of filesystem block

Query related to finding the block usage information of metadata
blocks in ext4 filesystem.

Using debugfs testb command I can check whether a particular
filesystem block is used or not.
# debugfs -R "testb 171428" /dev/sdd4
debugfs 1.41.12 (17-May-2010)
Block 171428 marked in use

Also its icheck command prints the inode associated, if any, with a
filesystem block.
# debugfs -R "icheck 171428" /dev/sdd4
debugfs 1.41.12 (17-May-2010)
Block     Inode number
171428    65152
But I don’t find any  debugfs command which can show similar block
usage information about metadata blocks, whether it is a superblock,
or inode bitmap block or block group descriptor, etc.
Is there any way to extract the usage information of metadata blocks
in ext4 filesystem ?
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