UFS snapshot weirdness

[Eirik Øverby]

On Feb 23, 2008, at 4:46 PM, Guido Falsi wrote:

> Eirik Øverby wrote:
>
>> I read somewhere else about NFS issues on 7-RC* where snapshots  
>> have been used. In particular - and this is something I'm seeing  
>> too - changing the exports file or reloading mountd gives the  
>> following in messages log:
>> Feb 19 18:58:09 anduin mountd[38867]: can't delete exports for / 
>> tmp: Invalid argument
>> Feb 19 18:58:09 anduin mountd[38867]: can't delete exports for / 
>> usr: Cross-device link
>> Feb 19 18:58:09 anduin mountd[38867]: can't delete exports for / 
>> var: Cross-device link
>> Feb 19 18:58:09 anduin mountd[38867]: can't delete exports for / 
>> export/home: Cross-device link
>> Feb 19 18:58:09 anduin mountd[38867]: can't delete exports for / 
>> opt: Cross-device link
>> Can this be related? I'm starting to worry here - what will be the  
>> long-term consequences if snapshots are stuck around in this  
>> "invisible" state?

Ok there is definitely something VERY fishy going on here.
I have just removed a lot of data from one of the partitions where I  
HAD snapshots (they are all gone now, since days). So freespace  
initially goes up a lot, as expected, then drops to around what it was  
before the deletion took place. There IS a snapshot being maintained  
somewhere, even though I have deleted it (using rm -f). What can I do,  
short of rebooting or remounting the filesystem??

This behavior is also seen on 6.2-RELEASE by the way; entirely  
different hardware (32bit vs 64bit, scsi vs ide, etc.)

/Eirik


>>
>
> I have been experiencing these too. But it looks more like a bug in  
> mountd, since it shows up only is snapshots are created with mount.  
> If snapshots are created with mksnap_ffs this does not seem to show  
> up.
>
> I still have to make more in depth experiments, but before  
> experimenting by myself I'd like to have some more informed  
> directions on what to experiment.
>
> -- 
> Guido Falsi <mad at madpilot.net>
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