[9fans] bind and namespace

[9fans] bind and namespace

[Antonin Vecera]

Hi all,

can somebody help me to understand to bind and namespace ?
I made dir for manual pages in my $home and I wanted to bind it to /sys/man .
I typed:

1.     term% bind -a $home/man/4 /sys/man/4
2.     term% ns
3.          bind /sys/man/4 /sys/man/4
4.          bind -a /usr/antonin/man/4 /sys/man/4
5.     term% unmount /sys/man/4 /sys/man/4
6.     term% ns
7.         bind /sys/man/4 /sys/man/4


a) I don't understand why is in my namespace added 3-th line?
b) if I unmounted /sys/man/4 on 5-th line, why is unmounted my
$home/man/4 instead and /sys/man/4 resides?


Antonin

Re: [9fans] bind and namespace

[Gorka Guardiola]

When you do a bind -a or a bind -b you have a union mount. That means
means "add something to what there already is there", be it before or
after. You need an entry
for what there is already there so it gets resolved. That are the
extra lines you are looking at.

--
- curiosity sKilled the cat

Re: [9fans] bind and namespace

[Antonin Vecera]

On 9/26/07, Gorka Guardiola <paurea@gmail.com> wrote:
> When you do a bind -a or a bind -b you have a union mount. That means
> means "add something to what there already is there", be it before or
> after. You need an entry

Till now it's clear.

> for what there is already there so it gets resolved. That are the
> extra lines you are looking at.
...sorry, i don't understand. :-(

Why 1 bind command adds 2! lines with bind command to my namespace?
Why is added "bind /sys/man/4 /sys/man/4" to namespace?
Why is one dir mounted to itself?


Antonin

Re: [9fans] bind and namespace

[Gorka Guardiola]

On 9/26/07, Antonin Vecera <antonin.vecera@gmail.com> wrote:
> Why 1 bind command adds 2! lines with bind command to my namespace?
> Why is added "bind /sys/man/4 /sys/man/4" to namespace?
> Why is one dir mounted to itself?
>

say you run:

bind -a /bla /tiki

This means "add an entry in the table under /tiki after what already exists".
If this is the first entry you have for /tiki, after doesn´t make
sense, you need
something already there. Hence, another entry binding /tiki in /tiki is added
before yours.


-- 
- curiosity sKilled the cat

Re: [9fans] bind and namespace

[Antonin Vecera]

On 9/26/07, Gorka Guardiola <paurea@gmail.com> wrote:
> On 9/26/07, Antonin Vecera <antonin.vecera@gmail.com> wrote:
> > Why 1 bind command adds 2! lines with bind command to my namespace?
> > Why is added "bind /sys/man/4 /sys/man/4" to namespace?
> > Why is one dir mounted to itself?
> >
>
> say you run:
>
> bind -a /bla /tiki
>
> This means "add an entry in the table under /tiki after what already exists".
> If this is the first entry you have for /tiki, after doesn´t make
> sense, you need
> something already there. Hence, another entry binding /tiki in /tiki is added
> before yours.

In my home profile is "bind -a $home/bin/rc /bin" .
Why is not in my namespace line "bind -a /bin /bin" ?
What is different between
     bind -a $home/bin/rc /bin
and
     bind -a $home/man/4 /sys/man/4  ?

Antonin

Antonin

Re: [9fans] bind and namespace

[Martin Neubauer]

* Antonin Vecera (antonin.vecera@gmail.com) wrote:
> In my home profile is "bind -a $home/bin/rc /bin" .
> Why is not in my namespace line "bind -a /bin /bin" ?
> What is different between
>      bind -a $home/bin/rc /bin
> and
>      bind -a $home/man/4 /sys/man/4  ?
>
> Antonin

Essentially because before there is something like
	bind $cputype/bin /bin

That assures that that there already is something $home/bin/rc can be
unioned to.

	Martin

Re: [9fans] bind and namespace

[Antonin Vecera]

Yes. Now it does sense to me.
Thank you! :-)

Antonin

On 9/26/07, Martin Neubauer <m.ne@gmx.net> wrote:
> * Antonin Vecera (antonin.vecera@gmail.com) wrote:
> > In my home profile is "bind -a $home/bin/rc /bin" .
> > Why is not in my namespace line "bind -a /bin /bin" ?
> > What is different between
> >      bind -a $home/bin/rc /bin
> > and
> >      bind -a $home/man/4 /sys/man/4  ?
> >
> > Antonin
>
> Essentially because before there is something like
>         bind $cputype/bin /bin
>
> That assures that that there already is something $home/bin/rc can be
> unioned to.
>
>         Martin
>
>