[Cluster-devel] [PATCH 2/4 Revised] NLM failover - nlm_set_igrace

[Wendy Cheng <wcheng@redhat.com>]

This change enables per NFS-export entry lockd grace period. The 
implementation is based on a double linked list fo_fsid_list that 
contains entries of fsid info. It is expected this would not be a 
frequent event. The fo_fsid_list is short and the entries expire within 
a maximum of 50 seconds.  The grace period setting follows the existing 
NLM grace period handling logic and is triggered via echoing the NFS 
export filesystem id into nfsd procfs entry as:

shell> echo 1234 > /proc/fs/nfsd/nlm_set_igrace

Signed-off-by: S. Wendy Cheng <wcheng@redhat.com>
Signed-off-by: Lon Hohberger  <lhh@redhat.com>

 fs/lockd/svc.c              |    8 +
 fs/lockd/svc4proc.c         |   28 +++++-
 fs/lockd/svcproc.c          |   29 +++++--
 fs/lockd/svcsubs.c          |  180 
++++++++++++++++++++++++++++++++++++++++++++
 fs/nfsd/nfsctl.c            |   32 +++++++
 include/linux/lockd/bind.h  |    3
 include/linux/lockd/lockd.h |   14 +++
 7 files changed, 279 insertions(+), 15 deletions(-)

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