Re: topics for the file system mini-summit

[Arjan van de Ven <arjan@linux.intel.com>]

Ric Wheeler wrote:
>>
> Any thoughts about what the right semantics are for properly doing a 
> forced unmount and how whether it is doable near term (as opposed to the 
> more strategic/long term issues laid out in this thread) ?

I would like to ask you take one step back; in the past when I have seen
people want "forced unmount" they wanted instead somethings else that they
thought (at that point incorrectly) forced unmount would solve.

there's a few things an unmount does
1) detach from the namespace (tree)
2) shut down the filesystem to
2a) allow someone else to mount/fsck/etc it
2b) finish stuff up and put it in a known state (clean)
3) shut down IO to a fs for another node to take over
    (which is what the "incorrectly" is about technically)