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List:       freebsd-hackers
Subject:    Re: FreeBSD fusefs-kmod shutdown problem workaround
From:       Dominic Fandrey <kamikaze () bsdforen ! de>
Date:       2008-06-24 7:23:07
Message-ID: 4860A0DB.8000100 () bsdforen ! de
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Kostik Belousov wrote:
> On Mon, Jun 23, 2008 at 02:41:29PM -0400, Zaphod Beeblebrox wrote:
>> On Mon, Jun 23, 2008 at 2:41 AM, Dominic Fandrey <kamikaze@bsdforen.de>
>> wrote:
>>
>>
>>> Thanks for the pointer. Unfortunately it seems that Csaba's patch only
>>> allows you to stall shutdown for 10 seconds. After heavy writing
>>> more than a minute can be necessary to prevent data loss.
>>>
>>> I have created a problem report: ports/124901
>>> http://www.freebsd.org/cgi/query-pr.cgi?pr=124901
>>>
>>> I hope this will make it. To me data loss and file system corruption
>>> are the worst case scenario and to me it's worth stalling shutdown
>>> for as long as it takes to write the data.
>>>
>> The shutdown watchdog timer is something I've had to adjust many times for
>> many different ports. Given this;
>>
>> I propose we have (at least) a new rcorder script variable.  Something like
>> "SHUTTIME" encoding the expected number of seconds required for the daemon
>> to shutdown in the worst case.
>>
>> Ideally, you'd want an overall watchdog and a per-script watchdog (so that
>> you're not waiting the sum of all these times in most cases).
> 
> We already have rcshutdown_timeout, see the rc.conf(5) and description
> of the sysctl kern.init_shutdown_timeout.

He knows that. He just wants something more fine-grained. And
rcshutdown_timeout has to be set by the user.

Following Zaphod's suggestion I'd like to have a more generous watchdog default
(maybe 3 minutes) and a per script watchdog that defaults to something around
30 seconds, but can be changed in the rc script.

I'll give that a try tonight.
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