So, this time there aren't any changes to the underlying gss_auth/rpc_pipe locking, and the gss code doesn't attempt to cancel rpc calls on its own. Instead we: - keep a single global variable which determines which version (new or old) of the upcall we use; - keep a counter which tells us count of gss pipes open + count of gss upcalls outstanding; - permit switching versions only when that counter goes to zero; - use pipe_open and pipe_release callbacks to maintain that counter; and - allow the gss code to wait on gssd to open a pipe before deciding which version of upcall to make. And the new locking change is one spinlock to protect the global pipe version. I've tested with an unmodified gssd, and checked that things still work correctly when gssd is killed and restarted. I haven't tested with a gssd that uses the new upcall yet. Most of these patches are just trivial preparatory cleanup, and the first two (maybe three) patches might be worth applying independently. --b. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
