Merge branch 'work.sock_recvmsg' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull kern_recvmsg reduction from Al Viro:
 "kernel_recvmsg() is a set_fs()-using wrapper for sock_recvmsg(). In
  all but one case that is not needed - use of ITER_KVEC for ->msg_iter
  takes care of the data and does not care about set_fs(). The only
  exception is svc_udp_recvfrom() where we want cmsg to be store into
  kernel object; everything else can just use sock_recvmsg() and be done
  with that.

  A followup converting svc_udp_recvfrom() away from set_fs() (and
  killing kernel_recvmsg() off) is *NOT* in here - I'd like to hear what
  netdev folks think of the approach proposed in that followup)"

* 'work.sock_recvmsg' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  tipc: switch to sock_recvmsg()
  smc: switch to sock_recvmsg()
  ipvs: switch to sock_recvmsg()
  mISDN: switch to sock_recvmsg()
  drbd: switch to sock_recvmsg()
  lustre lnet_sock_read(): switch to sock_recvmsg()
  cfs2: switch to sock_recvmsg()
  ncpfs: switch to sock_recvmsg()
  dlm: switch to sock_recvmsg()
  svc_recvfrom(): switch to sock_recvmsg()

4 files changed, 23 insertions, 34 deletions

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 4b4697a1f963..0a0394aa1b9c 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1847,7 +1847,7 @@ int drbd_send(struct drbd_connection *connection, struct socket *sock,
 	      void *buf, size_t size, unsigned msg_flags)
 {
 	struct kvec iov = {.iov_base = buf, .iov_len = size};
-	struct msghdr msg;
+	struct msghdr msg = {.msg_flags = msg_flags | MSG_NOSIGNAL};
 	int rv, sent = 0;
 
 	if (!sock)
@@ -1855,12 +1855,6 @@ int drbd_send(struct drbd_connection *connection, struct socket *sock,
 
 	/* THINK  if (signal_pending) return ... ? */
 
-	msg.msg_name       = NULL;
-	msg.msg_namelen    = 0;
-	msg.msg_control    = NULL;
-	msg.msg_controllen = 0;
-	msg.msg_flags      = msg_flags | MSG_NOSIGNAL;
-
 	iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iov, 1, size);
 
 	if (sock == connection->data.socket) {
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index cb2fa63f6bc0..c72dee0ef083 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -516,7 +516,8 @@ static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flag
 	struct msghdr msg = {
 		.msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL)
 	};
-	return kernel_recvmsg(sock, &msg, &iov, 1, size, msg.msg_flags);
+	iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &iov, 1, size);
+	return sock_recvmsg(sock, &msg, msg.msg_flags);
 }
 
 static int drbd_recv(struct drbd_connection *connection, void *buf, size_t size)
diff --git a/drivers/isdn/mISDN/l1oip_core.c b/drivers/isdn/mISDN/l1oip_core.c
index e3654782a3e2..21d50e4cc5e1 100644
--- a/drivers/isdn/mISDN/l1oip_core.c
+++ b/drivers/isdn/mISDN/l1oip_core.c
@@ -645,8 +645,10 @@ l1oip_socket_thread(void *data)
 {
 	struct l1oip *hc = (struct l1oip *)data;
 	int ret = 0;
-	struct msghdr msg;
 	struct sockaddr_in sin_rx;
+	struct kvec iov;
+	struct msghdr msg = {.msg_name = &sin_rx,
+			     .msg_namelen = sizeof(sin_rx)};
 	unsigned char *recvbuf;
 	size_t recvbuf_size = 1500;
 	int recvlen;
@@ -661,6 +663,9 @@ l1oip_socket_thread(void *data)
 		goto fail;
 	}
 
+	iov.iov_base = recvbuf;
+	iov.iov_len = recvbuf_size;
+
 	/* make daemon */
 	allow_signal(SIGTERM);
 
@@ -697,12 +702,6 @@ l1oip_socket_thread(void *data)
 		goto fail;
 	}
 
-	/* build receive message */
-	msg.msg_name = &sin_rx;
-	msg.msg_namelen = sizeof(sin_rx);
-	msg.msg_control = NULL;
-	msg.msg_controllen = 0;
-
 	/* build send message */
 	hc->sendmsg.msg_name = &hc->sin_remote;
 	hc->sendmsg.msg_namelen = sizeof(hc->sin_remote);
@@ -719,12 +718,9 @@ l1oip_socket_thread(void *data)
 		printk(KERN_DEBUG "%s: socket created and open\n",
 		       __func__);
 	while (!signal_pending(current)) {
-		struct kvec iov = {
-			.iov_base = recvbuf,
-			.iov_len = recvbuf_size,
-		};
-		recvlen = kernel_recvmsg(socket, &msg, &iov, 1,
-					 recvbuf_size, 0);
+		iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &iov, 1,
+				recvbuf_size);
+		recvlen = sock_recvmsg(socket, &msg, 0);
 		if (recvlen > 0) {
 			l1oip_socket_parse(hc, &sin_rx, recvbuf, recvlen);
 		} else {
diff --git a/drivers/staging/lustre/lnet/lnet/lib-socket.c b/drivers/staging/lustre/lnet/lnet/lib-socket.c
index 7d49d4865298..ed46aaca0ba3 100644
--- a/drivers/staging/lustre/lnet/lnet/lib-socket.c
+++ b/drivers/staging/lustre/lnet/lnet/lib-socket.c
@@ -314,19 +314,20 @@ lnet_sock_read(struct socket *sock, void *buffer, int nob, int timeout)
 	long jiffies_left = timeout * msecs_to_jiffies(MSEC_PER_SEC);
 	unsigned long then;
 	struct timeval tv;
+	struct kvec  iov = {
+		.iov_base = buffer,
+		.iov_len  = nob
+	};
+	struct msghdr msg = {
+		.msg_flags = 0
+	};
 
 	LASSERT(nob > 0);
 	LASSERT(jiffies_left > 0);
 
-	for (;;) {
-		struct kvec  iov = {
-			.iov_base = buffer,
-			.iov_len  = nob
-		};
-		struct msghdr msg = {
-			.msg_flags = 0
-		};
+	iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &iov, 1, nob);
 
+	for (;;) {
 		/* Set receive timeout to remaining time */
 		jiffies_to_timeval(jiffies_left, &tv);
 		rc = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
@@ -338,7 +339,7 @@ lnet_sock_read(struct socket *sock, void *buffer, int nob, int timeout)
 		}
 
 		then = jiffies;
-		rc = kernel_recvmsg(sock, &msg, &iov, 1, nob, 0);
+		rc = sock_recvmsg(sock, &msg, 0);
 		jiffies_left -= jiffies - then;
 
 		if (rc < 0)
@@ -347,10 +348,7 @@ lnet_sock_read(struct socket *sock, void *buffer, int nob, int timeout)
 		if (!rc)
 			return -ECONNRESET;
 
-		buffer = ((char *)buffer) + rc;
-		nob -= rc;
-
-		if (!nob)
+		if (!msg_data_left(&msg))
 			return 0;
 
 		if (jiffies_left <= 0)