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To dynamically adjust the thread count, nfsd requires some information about how busy things are. Change svc_recv() to take a timeout value, and then allow the wait for work to time out if it's set. If a timeout is not defined, then the schedule will be set to MAX_SCHEDULE_TIMEOUT. If the task waits for the full timeout, then have it return -ETIMEDOUT to the caller. If it wakes up, finds that there is more work and that no threads are available, then attempt to set SP_TASK_STARTING. If wasn't already set, have the task return -EBUSY to cue to the caller that the service could use more threads. Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>