Re: umount fails with device busy

[Chuck Lever <chuck.lever@oracle.com>]

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Peter Staubach wrote:
> Chuck Lever wrote:
>>>>> When I run umount during these ops I get an device busy. Any help 
>>>>> would be very appreciated!
>>>>
>>>> This is normal and expected behavior.  One problem may be that your 
>>>> server is slow, and thus there are RPCs left outstanding for a bit 
>>>> on your client after your application exits.  The COMMIT calls from 
>>>> that trace suggest that there is dirty data the client is writing 
>>>> back to the server. 
>>>
>>> It seems to me that this should not be the expected behavior unless
>>> the file system is mounted "nocto".  Is it?
>>
>> I'm a little puzzled myself about what dirty data there might be left 
>> after the application quits.  However, I'll be there is an mmap() 
>> lurking somewhere in the background...
>>
>> Data that was dirtied via a mapped file is not subject to the 
>> writeback part of close-to-open.
> 
> I don't think that I agree with this last statement.  Although
> it can not be implemented using the normal close system call,
> something should trigger the flush of any dirty pages and wait
> for them to complete.

This is the way Linux implements dirty mmaps on NFS because that's the 
way Linus wants it.  I didn't mean to imply that's the way it *should* 
work, merely the way it *does* work in Linux.

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