[Cluster-devel] [PATCH 2/5] NLM failover - per fs grace period

[Wendy Cheng <wcheng@redhat.com>]

This change enables per NFS-export entry lockd grace period. The
implementation is based on a global single linked list nlm_servs that
contains entries of fsid info. It is expected this would not be a
frequent event. The nlm_servs list should be 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 /proc/fs/nfsd/nlm_set_igrace
file 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         |   31 +++++++---
 fs/lockd/svcproc.c          |   29 +++++++--
 fs/lockd/svcsubs.c          |  133 ++++++++++++++++++++++++++++++++++++
++++++++ 
 fs/nfsd/nfsctl.c            |   32 ++++++++++
 include/linux/lockd/bind.h  |    3
 include/linux/lockd/lockd.h |   10 +++
 7 files changed, 230 insertions(+), 16 deletions(-)


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