Per-User QUOTA's vs blocksize

[Stacey Roberts]

Hello,

----- Original Message -----
From: "Scott Mitchell <scott+freebsd at fishballoon.org>"
To: To Matthew Seaman
Date: Wed, 10 Mar, 2004 09:56 GMT
Subject: Re: Per-User QUOTA's vs blocksize

> On Tue, Mar 09, 2004 at 02:05:54PM +0000, Matthew Seaman wrote:
> > On Mon, Mar 08, 2004 at 06:48:51PM +0000, Stacey Roberts wrote:
> > 
> > > "You may limit allocations based on disk space (block quotas)"
> > > 
> > > What exactly is the size of a block?
> > 
> > As the quota system uses the term, a block is 512b -- this unit is
> > also called a sector in some situations, but it's basically the same
> > thing.  It reflects the size of the underlying sector structures
> > within the filesystem.
> 
> True, but the term is used inappropriately by the quota tools and their
> documentation - these appear to work exclusively in KB units for their
> (ahem) 'block' quotas, at least on recent versions on FreeBSD.
> 
> See, for example, rev. 1.18 of edquota.c and the associated PR:
> http://www.freebsd.org/cgi/cvsweb.cgi/src/usr.sbin/edquota/edquota.c?rev=1.18&content-type=text/x-cvsweb-markup
> http://www.freebsd.org/cgi/query-pr.cgi?pr=41936

This is crazy.., there's not one iota on attempting to clarify this in the online HandBook.
> 
> There's a lot of explicit [some number of bytes]/1024 calculations in the
> various quota tools.
> 
> I have empirical evidence of this too - I set up 'block' quotas for my
> users many moons ago, assuming 512 byte blocks.  I was then quite surprised
> to run out of disk space last weekend, with du(1) showing several users
> massively over quota, but repquota(8) saying all was well.  Halving all the
> quota settings keeps everything in agreement.
> 
> The documentation is certainly misleading on this point.  I'll file a PR,
> unless anyone cares to beat me to it...

I'll submit a PR now..,

Thanks for this.

Regards,

Stacey

> 
> 	Scott
> 
> -- 
> ===========================================================================
> Scott Mitchell           | PGP Key ID | "Eagles may soar, but weasels
> Cambridge, England       | 0x54B171B9 |  don't get sucked into jet engines"
> scott at fishballoon.org | 0xAA775B8B |      -- Anon
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-- 
Stacey Roberts
B. Sc (HONS) Computer Science

Web: www.vickiandstacey.com
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