lockd: shift grabbing a reference to nlm_host into nlm_alloc_call()

It's used both for client and server hosts; we can't do nlmclnt_release_host()
on failure exits, since the host might need nlmsvc_release_host(), with BUG_ON()
for calling the wrong one.  Makes life simpler for callers, actually...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/lockd/clntproc.c

@@ -156,7 +156,6 @@ int nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl)
 	struct nlm_rqst		*call;
 	int			status;
 
-	nlm_get_host(host);
 	call = nlm_alloc_call(host);
 	if (call == NULL)
 		return -ENOMEM;
@@ -185,9 +184,6 @@ EXPORT_SYMBOL_GPL(nlmclnt_proc);
 
 /*
  * Allocate an NLM RPC call struct
- *
- * Note: the caller must hold a reference to host. In case of failure,
- * this reference will be released.
  */
 struct nlm_rqst *nlm_alloc_call(struct nlm_host *host)
 {
@@ -199,15 +195,14 @@ struct nlm_rqst *nlm_alloc_call(struct nlm_host *host)
 			atomic_set(&call->a_count, 1);
 			locks_init_lock(&call->a_args.lock.fl);
 			locks_init_lock(&call->a_res.lock.fl);
-			call->a_host = host;
+			call->a_host = nlm_get_host(host);
 			return call;
 		}
 		if (signalled())
 			break;
 		printk("nlm_alloc_call: failed, waiting for memory\n");
 		schedule_timeout_interruptible(5*HZ);
 	}
-	nlmclnt_release_host(host);
 	return NULL;
 }
 
@@ -750,7 +745,7 @@ static int nlmclnt_cancel(struct nlm_host *host, int block, struct file_lock *fl
 	dprintk("lockd: blocking lock attempt was interrupted by a signal.\n"
 		"       Attempting to cancel lock.\n");
 
-	req = nlm_alloc_call(nlm_get_host(host));
+	req = nlm_alloc_call(host);
 	if (!req)
 		return -ENOMEM;
 	req->a_flags = RPC_TASK_ASYNC;

fs/lockd/svc4proc.c

@@ -256,6 +256,7 @@ static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args
 		return rpc_system_err;
 
 	call = nlm_alloc_call(host);
+	nlmsvc_release_host(host);
 	if (call == NULL)
 		return rpc_system_err;
 

fs/lockd/svclock.c

@@ -219,7 +219,6 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_host *host,
 	struct nlm_block	*block;
 	struct nlm_rqst		*call = NULL;
 
-	nlm_get_host(host);
 	call = nlm_alloc_call(host);
 	if (call == NULL)
 		return NULL;

fs/lockd/svcproc.c

@@ -294,6 +294,7 @@ static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args
 		return rpc_system_err;
 
 	call = nlm_alloc_call(host);
+	nlmsvc_release_host(host);
 	if (call == NULL)
 		return rpc_system_err;