Public bug reported:

Binary package hint: e2fsprogs

gave up on a inode resize after some hours

from http://marc.info/?l=linux-ext4&m=122672822822037&w=2

    tune2fs: Fix inefficient O(n**2) algorithms when expanding the inode size
    
    When running "tune2fs -I 256" on moderate to large filesystems, the
    time required to run tune2fs can take many hours (20+ before some
    users gave up in disgust).  This was due to some O(n**2) and O(n*m)
    algorithms in move_block() and inode_scan_and_fix(), respectively.

** Affects: e2fsprogs (Ubuntu)
     Importance: Undecided
         Status: New

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"tune2fs -I 256" extremly slow
https://bugs.launchpad.net/bugs/298343
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