Hi Bruce, This series of patches implement the NFSv4 Courteous Server. A server which does not immediately expunge the state on lease expiration is known as a Courteous Server. A Courteous Server continues to recognize previously generated state tokens as valid until conflict arises between the expired state and the requests from another client, or the server reboots. The v2 patch includes the following: . add new callback, lm_expire_lock, to lock_manager_operations to allow the lock manager to take appropriate action with conflict lock. . handle conflicts of NFSv4 locks with NFSv3/NLM and local locks. . expire courtesy client after 24hr if client has not reconnected. . do not allow expired client to become courtesy client if there are waiters for client's locks. . modify client_info_show to show courtesy client and seconds from last renew. . fix a problem with NFSv4.1 server where the it keeps returning SEQ4_STATUS_CB_PATH_DOWN in the successful SEQUENCE reply, after the courtesy client re-connects, causing the client to keep sending BCTS requests to server. The v3 patch includes the following: . modified posix_test_lock to check and resolve conflict locks to handle NLM TEST and NFSv4 LOCKT requests. . separate out fix for back channel stuck in SEQ4_STATUS_CB_PATH_DOWN. The v4 patch includes: . rework nfsd_check_courtesy to avoid dead lock of fl_lock and client_lock by asking the laudromat thread to destroy the courtesy client. . handle NFSv4 share reservation conflicts with courtesy client. This includes conflicts between access mode and deny mode and vice versa. . drop the patch for back channel stuck in SEQ4_STATUS_CB_PATH_DOWN. NOTE: I will submit pynfs tests for courteous server including tests for share reservation conflicts in a separate patch.
