[Cluster-devel] [PATCH 1/4 Revised] NLM failover - nlm_unlock

[Wendy Cheng <wcheng@redhat.com>]

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/ext3/exports *(fsid=1234,sync,rw)
2) Drops locks based on fsid by:
   shell> echo 1234 > /proc/fs/nfsd/nlm_unlock

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

 fs/lockd/svcsubs.c          |   79 
+++++++++++++++++++++++++++++++++++++++++---
 fs/nfsd/nfsctl.c            |   42 +++++++++++++++++++++++
 include/linux/lockd/bind.h  |    5 ++
 include/linux/lockd/lockd.h |    2 +
 include/linux/nfsd/debug.h  |    1
 5 files changed, 124 insertions(+), 5 deletions(-)

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