NFSv4: Add lease_time and lease_expired to 'nfs4:' line of mountstats
On the NFS client there is no low-impact way to determine the nfs4 lease time or whether the lease is expired, so add these to mountstats with times displayed in seconds. If the lease is not expired, display lease_expired=0. Otherwise, display lease_expired=seconds_since_expired, similar to 'age:' line in mountstats. Signed-off-by: Dave Wysochanski <dwysocha@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
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