freebsd stable - Feb 2013 - problem stoping jails with jail(8), jail.conf and mount.fstab

Hello,

on 9.1-R, I highly appreciate the new jail(8) and jail.conf
capabilities. Thanks for that extension!

But I have one problem: If I want to stop a jail with 'jaill -r
jailname', I get "umount: unmount of /.jail.jailname failed: Device
busy"

It seems to me that the order of fstab.jailname entries are not reverted
by jail(8) when shutting down/umounting.
My C skills don't allow me to verify/fix that in usr.sbin/jail/command.c

Can anybody help please?

Thanks,

-Harry

(not subscribed to jail@)

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schrieb Harald Schmalzbauer am 12.02.2013 15:47
(localtime):
>  Hello,
>
> on 9.1-R, I highly appreciate the new jail(8) and jail.conf
> capabilities. Thanks for that extension!
>
> But I have one problem: If I want to stop a jail with 'jaill -r
> jailname', I get "umount: unmount of /.jail.jailname failed:
Device busy"
>
> It seems to me that the order of fstab.jailname entries are not reverted
> by jail(8) when shutting down/umounting.
> My C skills don't allow me to verify/fix that in
usr.sbin/jail/command.c
Btw, experimental falsifying isn't the problem:
fstab.jail1:
/dev/gpt/jail1ROOT    /.jail.jail1    ufs    ro    0 0
/dev/gpt/jail1VAR    /.jail.jail1/var    ufs    rw,noatime 0 0

Starting jail with 'jail -c jail1': everything fine.

Stoping jail with 'jail -r jail1': error when fstab.jail1 is like above,
but error vanishes if I revert the two lines above before stoping!
So the root cause seems to be obvious.
But like mentioned, I can't fix that myself :-(

Thanks,

-Harry

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On 02/12/13 07:47, Harald Schmalzbauer wrote:
>   Hello,
>
> on 9.1-R, I highly appreciate the new jail(8) and jail.conf
> capabilities. Thanks for that extension!
>
> But I have one problem: If I want to stop a jail with 'jaill -r
> jailname', I get "umount: unmount of /.jail.jailname failed:
Device busy"
>
> It seems to me that the order of fstab.jailname entries are not reverted
> by jail(8) when shutting down/umounting.
> My C skills don't allow me to verify/fix that in
usr.sbin/jail/command.c
>
> Can anybody help please?
>
> Thanks,
>
> -Harry

Yes, that's a serious drawback.  I'll work something up for that.

- Jamie