[Lakshmipathi.G]

How to copy metadata of all files in a ext4 filesystem.

You can also write a user-space program with ext2lib to achieve such task.
Have a look at giis-ext4 from here http://www.giis.co.in/giis/ - user-space
program
which stores inode details on a sqlite db using ext2lib.

HTH
-- 
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Cheers,
Lakshmipathi.G
FOSS Programmer.
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