[systemd-devel] when will mount / df get fixed?

[Reindl Harald]

Am 01.10.2012 13:29, schrieb Karel Zak:
> On Sat, Sep 29, 2012 at 07:36:54PM +0200, Reindl Harald wrote:
>  There is no difference. The "bind" is an operation, not a special
>  state of any mountpoint. Nowhere in the system is information that
>  the mountpoint has been created by "bind" -- the kernel does not
>  see any difference between the original and bind mount. It's just
>  another reference to the same object (device).
>     mount /dev/sda1 /mnt1
>     mount /dev/sda1 /mnt2
> 
>  is exactly the same as:
> 
>     mount /dev/sda1 /mnt1
>     mount --bind /mnt1 /mnt2

but there was a difference until F15 came out with systemd

>  We should not care about "bind" flag in mtab (or another place) at
>  all. The solution is to de-duplicate df(1) output.

and how should "df" do this?
how should "df" smell that "/mnt/data" is the one to display?

/dev/md2       3814414416 2335948104 1478466312   62% /mnt/data
/dev/md2       3814414416 2335948104 1478466312   62% /home
/dev/md2       3814414416 2335948104 1478466312   62% /tmp
/dev/md2       3814414416 2335948104 1478466312   62% /var/tmp
/dev/md2       3814414416 2335948104 1478466312   62% /Volumes/dune/www-servers
/dev/md2       3814414416 2335948104 1478466312   62% /Volumes/dune/www-servers/phpincludes

>  It's fine to blame systemd guys for all the bad things in the World,
>  but kill the original mtab concept was planned independently on
>  systemd.

however, before killing things which worked fine for decades
there should be a thought how to change things internally
without change the behavior from the users view

only the fact that the named-chroot mounts caused a error
message for a normal user proves that there was not much
testing/thinking about impacts - this one meant to get
error-mails from EVERY cronjob-script using "df"

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