[Cluster-devel] [RFC PATCH 2/3] NLM lock failover - per ip grace period

[Wendy Cheng]

This patch enables per ip NLM lock grace period. The implementation is 
based on a global single linked list nlm_servs that contains entries of 
per server ip info. It is expected this would not be a frequent event. 
The nlm_servs list should be short and the entries would expire within a 
maximum of 50 seconds.  The grace period setting follows the existing 
NLM grace period handling without changes. Logic is triggered via 
echoing the ipv4 dot address into /proc/fs/nfsd/nlm_set_ip_grace file.



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