[PATCH] knfsd: lockd: introduce nsm_handle

This patch introduces the nsm_handle, which is shared by all nlm_host objects
referring to the same client.

With this patch applied, all nlm_hosts from the same address will share the
same nsm_handle.  A future patch will add sharing by name.

Note: this patch changes h_name so that it is no longer guaranteed to be an IP
address of the host.  When the host represents an NFS server, h_name will be
the name passed in the mount call.  When the host represents a client, h_name
will be the name presented in the lock request received from the client.  A
h_name is only used for printing informational messages, this change should
not be significant.

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>

1 files changed, 14 insertions, 3 deletions

diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 0f9b236bca7f..ab2ffc8a0b44 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -40,14 +40,13 @@ struct nlm_host {
         struct nlm_host *       h_next;         /* linked list (hash table) */
         struct sockaddr_in      h_addr;         /* peer address */
         struct rpc_clnt *       h_rpcclnt;      /* RPC client to talk to peer */
-        char                    h_name[20];     /* remote hostname */
+        char *                  h_name;         /* remote hostname */
         u32                     h_version;      /* interface version */
         unsigned short          h_proto;        /* transport proto */
         unsigned short          h_reclaiming : 1,
                                 h_server     : 1, /* server side, not client side */
                                 h_inuse      : 1,
-                                h_killed     : 1,
-                                h_monitored  : 1;
+                                h_killed     : 1;
         wait_queue_head_t       h_gracewait;    /* wait while reclaiming */
         struct rw_semaphore     h_rwsem;        /* Reboot recovery lock */
         u32                     h_state;        /* pseudo-state counter */
@@ -61,6 +60,16 @@ struct nlm_host {
         spinlock_t              h_lock;
         struct list_head        h_granted;      /* Locks in GRANTED state */
         struct list_head        h_reclaim;      /* Locks in RECLAIM state */
+        struct nsm_handle *     h_nsmhandle;    /* NSM status handle */
+};
+
+struct nsm_handle {
+        struct list_head        sm_link;
+        atomic_t                sm_count;
+        char *                  sm_name;
+        struct sockaddr_in      sm_addr;
+        unsigned int            sm_monitored : 1,
+                                sm_sticky : 1;  /* don't unmonitor */
 };
 
 /*
@@ -171,6 +180,8 @@ void		  nlm_release_host(struct nlm_host *);
 void              nlm_shutdown_hosts(void);
 extern struct nlm_host *nlm_find_client(void);
 extern void       nlm_host_rebooted(const struct sockaddr_in *, const struct nlm_reboot *);
+struct nsm_handle *nsm_find(const struct sockaddr_in *, const char *, int);
+void              nsm_release(struct nsm_handle *);
 
 
 /*