[PATCH] knfsd: simplify nlmsvc_invalidate_all

As a result of previous patches, the loop in nlmsvc_invalidate_all just sets
h_expires for all client/hosts to 0 (though does it in a very complicated
way).

This was possibly meant to trigger early garbage collection but half the time
'0' is in the future and so it infact delays garbage collection.

Pre-aging the 'hosts' is not really needed at this point anyway so we throw
out the loop and nlm_find_client which is no longer needed.

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

fs/lockd/host.c

@@ -192,33 +192,6 @@ nlm_destroy_host(struct nlm_host *host)
 	kfree(host);
 }
 
-struct nlm_host *
-nlm_find_client(void)
-{
-	struct hlist_head *chain;
-	struct hlist_node *pos;
-
-	/* find a nlm_host for a client for which h_killed == 0.
-	 * and return it
-	 */
-	mutex_lock(&nlm_host_mutex);
-	for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
-		struct nlm_host *host;
-
-		hlist_for_each_entry(host, pos, chain, h_hash) {
-			if (host->h_server &&
-			    host->h_killed == 0) {
-				nlm_get_host(host);
-				mutex_unlock(&nlm_host_mutex);
-				return host;
-			}
-		}
-	}
-	mutex_unlock(&nlm_host_mutex);
-	return NULL;
-}
-
-
 /*
  * Create the NLM RPC client for an NLM peer
  */

fs/lockd/svcsubs.c

@@ -354,24 +354,16 @@ nlmsvc_free_host_resources(struct nlm_host *host)
 }
 
 /*
- * delete all hosts structs for clients
+ * Remove all locks held for clients
  */
 void
 nlmsvc_invalidate_all(void)
 {
-	struct nlm_host *host;
-
 	/* Release all locks held by NFS clients.
 	 * Previously, the code would call
 	 * nlmsvc_free_host_resources for each client in
 	 * turn, which is about as inefficient as it gets.
 	 * Now we just do it once in nlm_traverse_files.
 	 */
 	nlm_traverse_files(NULL, nlmsvc_is_client);
-
-	while ((host = nlm_find_client()) != NULL) {
-		host->h_expires = 0;
-		host->h_killed = 1;
-		nlm_release_host(host);
-	}
 }

include/linux/lockd/lockd.h

@@ -45,8 +45,7 @@ struct nlm_host {
 	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_inuse      : 1;
 	wait_queue_head_t	h_gracewait;	/* wait while reclaiming */
 	struct rw_semaphore	h_rwsem;	/* Reboot recovery lock */
 	u32			h_state;	/* pseudo-state counter */
@@ -169,7 +168,6 @@ void		  nlm_rebind_host(struct nlm_host *);
 struct nlm_host * nlm_get_host(struct nlm_host *);
 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 char *, int, u32);
 struct nsm_handle *nsm_find(const struct sockaddr_in *, const char *, int);
 void		  nsm_release(struct nsm_handle *);