linux-ext4 - Re: ext3: deleting files doesn't free up space

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Message-ID: <20110110074810.GB21505@bitwizard.nl>
Date:	Mon, 10 Jan 2011 08:48:10 +0100
From:	Rogier Wolff <R.E.Wolff@...Wizard.nl>
To:	Dan Carpenter <error27@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-ext4@...r.kernel.org
Subject: Re: ext3: deleting files doesn't free up space

On Mon, Jan 10, 2011 at 08:22:25AM +0300, Dan Carpenter wrote:
> I filled up my partition last night.
> I deleted 5 gigs of movies.
> The "Used" number went down to 125G.
> The "Free" number stayed at 0.
> I rebooted the system but it's still the same.

Hi Dan, 

The system keeps at least 5 or 10% of the total space free so that it
will always be able to find a reasonably unfragmented spot for a new
big file. That same 5 or 10% CAN be written by the root-user in
emergencies. But "root" should know it can affect the peformance of
his filesystem. Anyway, because you're still using part of the 5 - 10%
reserved-for-performance reasons, "df" will report the user-available
space as zero. 

	Roger. 

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