[PATCH] knfsd: lockd: optionally use hostnames for identifying peers

This patch adds the nsm_use_hostnames sysctl and module param.  If set, lockd
will use the client's name (as given in the NLM arguments) to find the NSM
handle.  This makes recovery work when the NFS peer is multi-homed, and the
reboot notification arrives from a different IP than the original lock calls.

Signed-off-by: Olaf Kirch <okir@suse.de>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 1fcf936d75b9..7be7aeaeee58 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -142,6 +142,7 @@ extern struct svc_procedure	nlmsvc_procedures4[];
 #endif
 extern int                      nlmsvc_grace_period;
 extern unsigned long            nlmsvc_timeout;
+extern int                      nsm_use_hostnames;
 
 /*
  * Lockd client functions
diff --git a/include/linux/lockd/sm_inter.h b/include/linux/lockd/sm_inter.h
index d93b074668ce..daef509bb9b3 100644
--- a/include/linux/lockd/sm_inter.h
+++ b/include/linux/lockd/sm_inter.h
@@ -28,6 +28,8 @@ struct nsm_args {
         u32             prog;           /* RPC callback info */
         u32             vers;
         u32             proc;
+
+        char *          mon_name;
 };
 
 /*