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mds: Client syncfs is slow (waits for next MDS tick) #15544
This has passed tests + is ready to merge, @taodd please could you clean up the commit messages, they should be something like this:
Have a look at other recent commits in the repository for examples.
@ukernel @taodd anyone have any thoughts about how to handle upgrades? I should have asked this before merging really :-), but we definitely need an answer before we release luminous -- MDSs currently abort if they see an unexpected CEPH_SESSION_* in a MClientSession, so the client probably needs a way to avoid sending it to older MDSs.