linux-ext4 - Use fsck to free the space used by dir?

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Message-ID: <501BDDE5.8060005@gmail.com>
Date:	Fri, 03 Aug 2012 22:19:17 +0800
From:	Wang Sheng-Hui <shhuiw@...il.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Use fsck to free the space used by dir?

Dear all,

I read through the namei.c code recently, but didn't notice any code to
reduce the size of a dir file (append can increase its size though).

I wonder if I create large amount of files under dir A, then remove all
the sub items, do I need to run fsck to free the disk space used by the
dir file? 

Please help confirm or if I missed some points.

Regards,
Sheng-Hui
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