By writing exported filesytem id into /proc/fs/nfsd/nlm_unlock, this 
patch walks thru lockd's global nlm_files list to release all the locks 
associated with the particular id. It is used to enable NFS lock 
failover with active-active clustered servers.

Relevant steps:
1) Exports filesystem with "fsid" option as:
  /etc/exports entry> /mnt/shared/exports *(fsid=1234,sync,rw)
2) Drops locks based on fsid by:
  shell> echo 1234 > /proc/fs/nfsd/nlm_unlock

-- Wendy
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