trimming of chroot jail path in df(1)

[Alexandr Kovalenko]

Hello, Pawel Jakub Dawidek!

On Mon, Jun 02, 2003 at 05:16:54PM +0200, you wrote:

> On Mon, Jun 02, 2003 at 04:02:48PM +0300, Alexandr Kovalenko wrote:
> +> I've found module jailfsstat:
> +> 
> +> http://garage.freebsd.pl/jailfsstat.tgz
> +> 
> +> which task is that process in jail can see only file systems mounted
> +> inside of jail.
> +> 
> +> It works somehow incorrect and I would like to ask you for an URL of
> +> FreeBSD's vfs implementation documentation.
> 
> Somebody has raported that there is off-by-one error somewhere, but it
> wasn't critical AFAIK. Have you found some other incorrect behaviour?
> If yes, I could always fix it in my free time.

Incorrect behaviour is: in host system:

bash-2.05b# df
Filesystem  1K-blocks    Used     Avail Capacity  Mounted on
/dev/da0s1a    128990   35988     82684    30%    /
/dev/da0s1f   2064302    8344   1890814     0%    /tmp
/dev/da0s1g  10322414 1703924   7792698    18%    /usr
/dev/da0s1h  97825400 3834024  86165344     4%    /usr/local
/dev/da0s1e   2064302   12758   1886400     1%    /var
/dev/da1s1e 233513688 1889152 212943448     1%    /jails
procfs              4       4         0   100%    /proc
/dev/vn1a      503966  149870    313780    32%    /jails/mounts/217.20.163.128
procfs              4       4         0   100%    /jails/mounts/217.20.163.128/proc
/dev/vn2a      503966  203640    260010    44%    /jails/mounts/217.20.163.129
procfs              4       4         0   100%    /jails/mounts/217.20.163.129/proc

with your, unpatched version:

Filesystem 1K-blocks   Used  Avail Capacity  Mounted on
/dev/vn1a     503966 149870 313780    32%    /
procfs             4      4      0   100%    /proc
/dev/vn2a     503966 203640 260010    44%    
procfs             4      4      0   100%    /proc

with patch I've just sent to you:

Filesystem 1K-blocks   Used  Avail Capacity  Mounted on
/dev/vn1a     503966 149870 313780    32%    /
procfs             4      4      0   100%    /proc

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