What we need is "if we are doing last iput() on fs that is getting
shut, sync it and don't leave it in cache". And yes, we have a similar
path in iput(). Similar, but not quite the same.
Fix is
* new fs flag: "MS_ACTIVE".
* set after normal ->read_super().
* reset after we are done with fsync_super() in kill_super().
* iput() checking that and if it's set - doing write_inode_now() and kicking
it out of hash.
I'll send patch in ~10 minutes.
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