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Date: Mon, 27 Nov 2006 21:35:32 +0300
From: "Andrew Pantyukhin" <infofarmer@FreeBSD.org>
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To: "Dan Nelson" <dnelson@allantgroup.com>
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Cc: Peter Schuller <peter.schuller@infidyne.com>, freebsd-questions@freebsd.org
Subject: Re: Empty directory 60M in size; used to contain 1.7 million files
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On 11/27/06, Dan Nelson <dnelson@allantgroup.com> wrote:
> In the last episode (Nov 27), Peter Schuller said:
> > Observe:
> >
> > hyperion# ls -la
> > total 61634
> > drwxr-xr-x  2 xxx yyy  63047168 Nov 18 21:33 .
> > drwxr-xr-x  6 xxx yyy         512 Oct  8 16:39 ..
> > hyperion# find .
> > .
> > hyperion#
> >
> > The one special circumstance is that the directory previously
> > contained 1.7 million small files, that are now deleted. This is on
> > FreeBSD 6.1 with UFS2 + softupdates. No snapshots exist of the
> > filesystem.
> >
> > 1.7 million files may be extreme, but I don't see why an empty
> > directory would ever consume more than one inode?
>
> Directories are only shrunk when a file is created and the slack
> directory space can be trivially truncated.  This is to avoid useless
> compaction during "rm -rf"-style activities of a directory that will
> just be deleted anyway.

Shouldn't it be done after a timeout? I can imagine scenarios
when millions of small files are created and deleted in different
dirs. Should it result in no disk space (and a clueless user)?