linux-ext4 - Maximum number of directories

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Date:	Mon, 04 Feb 2013 10:55:54 +0000
From:	Tvrtko Ursulin <tvrtko.ursulin@...lan.co.uk>
To:	linux-ext4@...r.kernel.org
Subject: Maximum number of directories

Hi all,

What is the maximum number of directories ext4 can hold in a tree layout with 
a depth of ~160 and each directory node having then a couple to couple dozen 
subdirectories?

I was creating such a (crazy?) tree and hit -ENOSPC at ~31 million directories 
created in total with df showing only 40% use:

Filesystem                 1K-blocks       Used  Available Use% Mounted on
/dev/mapper/data           477277612K 177766152K 275621952K  40% /data

Some lines from tune2fs made me think it should hold more, but obviously I was 
mistaken? Or it is a bug?

Inode count:              29868032
Free inodes:              29848131

Regards,

Tvrtko

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