The first patch hopefully fixes a bug with locking as reported by Li Lingfeng: some write_foo functions aren't locked properly. The other two improve the locking code, particulary so that we don't need a global mutex to change per-netns data. I've revised the locking to use guard(mutex) for (almost) all places that the per-netfs mutex is used. I think this is an improvement but would like to know what others think. I haven't changed _get/_put to _pin/_unpin as Chuck wondered about. I'm not against that (though get/put are widely understood) but nor am I particularly for it yet. Again, opinions are welcome. NeilBrown [PATCH 1/3] nfsd: provide proper locking for all write_ function [PATCH 2/3] nfsd: use kref and new mutex for global config management [PATCH 3/3] nfsd: split nfsd_mutex into one mutex per net-namespace.
