From owner-freebsd-jail@FreeBSD.ORG  Fri Sep 18 08:37:39 2009
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Date: Fri, 18 Sep 2009 10:18:33 +0200
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Andrey Groshev <greenx@yartv.ru>
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Cc: freebsd-jail@freebsd.org
Subject: Re: df output into jail
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Andrey Groshev wrote:
> Hi, All!
> 
> I create garbage files.
> Mounted in the main system partition for data.
> 
> #mount|grep /usr/jails/samba/
> /dev/amrd0s4d.journal on /usr/jails/samba/data (ufs, asynchronous, 
> local, noatime, nosuid, gjournal)
> /usr/jails/basejail on /usr/jails/samba/basejail (nullfs, local, read-only)
> devfs on /usr/jails/samba/dev (devfs, local)
> fdescfs on /usr/jails/samba/dev/fd (fdescfs)
> procfs on /usr/jails/samba/proc (procfs, local)
> 
> 
> And now...
> I see the output in the Jail "df-h" - it returns only the root mount.
> 
> # df -h
> Filesystem       Size    Used   Avail Capacity  Mounted on
> /dev/amrd0s4a     18G    3.6G     13G    21%    /
> 
> If you ask specifically "df-h / data", then displays the desired data.
> 
> # df -h /data
> Filesystem               Size    Used   Avail Capacity  Mounted on
> /dev/amrd0s4d.journal    178G    768M    163G     0%    [restricted]
> 
> Looking sources, decided that this is due to answer "mount".
> IMHO, should be able to see the file systems mounted below the directory 
> of jail.

I think you are looking for security.jail.enforce_statfs=1
Default is security.jail.enforce_statfs=2!

See man jail(8) for more details.

Miroslav Lachman