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

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Message-ID: <501BEBE1.5080508@redhat.com>
Date:	Fri, 03 Aug 2012 10:18:57 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Wang Sheng-Hui <shhuiw@...il.com>
CC:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Use fsck to free the space used by dir?

On 8/3/12 9:19 AM, Wang Sheng-Hui wrote:
> 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).

Right, AFAIK nothing in kernelspace will reduce the size.

> 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? 

Yes, e2fsck -fD should compress them again.

-Eric

> Please help confirm or if I missed some points.
> 
> 
> Regards,
> Sheng-Hui
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