Re: 'umount -f /mnt/foo' fails if server IP is gone.

[Ben Greear <greearb@candelatech.com>]

On 10/17/2013 11:05 AM, Myklebust, Trond wrote:
> On Thu, 2013-10-17 at 10:35 -0700, Ben Greear wrote:
>> On 10/15/2013 11:29 AM, Ben Greear wrote:
>>> Is 'umount -f' supposed to always work, even if the file server
>>> goes away?
>>>
>>> I have a user's system that just hangs forever in this case.
>>>
>>> Could be local changes we have made, but I'm curious about
>>> the expected behaviour before I go digging too deep...
>>
>> Any input on this?  I don't mind trying to fix it, but I
>> would like to know how it is supposed to work.
> 
> 'umount -f' has always been iffy. It just kills any pending RPC calls
> _before_ trying to unmount. Since the unmount itself can trigger
> writeback flushes (and hence more RPC calls), the trace you are seeing
> is indeed possible.

I tried 'umount -f -l', and that also does not work.

Any ideas on how to fix this properly?

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com