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Message-ID: <1425281868-25684-2-git-send-email-ying.xue@windriver.com>
Date: Mon, 2 Mar 2015 15:37:47 +0800
From: Ying Xue <ying.xue@...driver.com>
To: <viro@...IV.linux.org.uk>, <hch@....de>, <davem@...emloft.net>
CC: <netdev@...r.kernel.org>, <erik.hugne@...csson.com>,
<jon.maloy@...csson.com>
Subject: [PATCH net-next v2 1/2] tipc: Don't use iocb argument in socket layer
Currently the iocb argument is used to idenfiy whether or not socket
lock is hold before tipc_sendmsg()/tipc_send_stream() is called. But
this usage prevents iocb argument from being dropped through sendmsg()
at socket common layer. Therefore, in the commit we introduce two new
functions called __tipc_sendmsg() and __tipc_send_stream(). When they
are invoked, it assumes that their callers have taken socket lock,
thereby avoiding the weird usage of iocb argument.
Cc: Al Viro <viro@...IV.linux.org.uk>
Cc: Christoph Hellwig <hch@....de>
Reviewed-by: Erik Hugne <erik.hugne@...csson.com>
Reviewed-by: Jon Maloy <jon.maloy@...csson.com>
Signed-off-by: Ying Xue <ying.xue@...driver.com>
---
net/tipc/socket.c | 82 ++++++++++++++++++++++++++++-------------------------
1 file changed, 44 insertions(+), 38 deletions(-)
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index f73e975..c245ec3 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -114,6 +114,9 @@ static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
static int tipc_sk_insert(struct tipc_sock *tsk);
static void tipc_sk_remove(struct tipc_sock *tsk);
+static int __tipc_send_stream(struct socket *sock, struct msghdr *m,
+ size_t dsz);
+static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
static const struct proto_ops packet_ops;
static const struct proto_ops stream_ops;
@@ -907,6 +910,18 @@ static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t dsz)
{
+ struct sock *sk = sock->sk;
+ int ret;
+
+ lock_sock(sk);
+ ret = __tipc_sendmsg(sock, m, dsz);
+ release_sock(sk);
+
+ return ret;
+}
+
+static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz)
+{
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
struct sock *sk = sock->sk;
struct tipc_sock *tsk = tipc_sk(sk);
@@ -931,22 +946,13 @@ static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
if (dsz > TIPC_MAX_USER_MSG_SIZE)
return -EMSGSIZE;
- if (iocb)
- lock_sock(sk);
-
if (unlikely(sock->state != SS_READY)) {
- if (sock->state == SS_LISTENING) {
- rc = -EPIPE;
- goto exit;
- }
- if (sock->state != SS_UNCONNECTED) {
- rc = -EISCONN;
- goto exit;
- }
- if (tsk->published) {
- rc = -EOPNOTSUPP;
- goto exit;
- }
+ if (sock->state == SS_LISTENING)
+ return -EPIPE;
+ if (sock->state != SS_UNCONNECTED)
+ return -EISCONN;
+ if (tsk->published)
+ return -EOPNOTSUPP;
if (dest->addrtype == TIPC_ADDR_NAME) {
tsk->conn_type = dest->addr.name.name.type;
tsk->conn_instance = dest->addr.name.name.instance;
@@ -956,8 +962,7 @@ static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
if (dest->addrtype == TIPC_ADDR_MCAST) {
- rc = tipc_sendmcast(sock, seq, m, dsz, timeo);
- goto exit;
+ return tipc_sendmcast(sock, seq, m, dsz, timeo);
} else if (dest->addrtype == TIPC_ADDR_NAME) {
u32 type = dest->addr.name.name.type;
u32 inst = dest->addr.name.name.instance;
@@ -972,10 +977,8 @@ static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
dport = tipc_nametbl_translate(net, type, inst, &dnode);
msg_set_destnode(mhdr, dnode);
msg_set_destport(mhdr, dport);
- if (unlikely(!dport && !dnode)) {
- rc = -EHOSTUNREACH;
- goto exit;
- }
+ if (unlikely(!dport && !dnode))
+ return -EHOSTUNREACH;
} else if (dest->addrtype == TIPC_ADDR_ID) {
dnode = dest->addr.id.node;
msg_set_type(mhdr, TIPC_DIRECT_MSG);
@@ -990,7 +993,7 @@ new_mtu:
mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
rc = tipc_msg_build(mhdr, m, 0, dsz, mtu, pktchain);
if (rc < 0)
- goto exit;
+ return rc;
do {
skb = skb_peek(pktchain);
@@ -1013,9 +1016,6 @@ new_mtu:
if (rc)
__skb_queue_purge(pktchain);
} while (!rc);
-exit:
- if (iocb)
- release_sock(sk);
return rc;
}
@@ -1066,6 +1066,18 @@ static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t dsz)
{
struct sock *sk = sock->sk;
+ int ret;
+
+ lock_sock(sk);
+ ret = __tipc_send_stream(sock, m, dsz);
+ release_sock(sk);
+
+ return ret;
+}
+
+static int __tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
+{
+ struct sock *sk = sock->sk;
struct net *net = sock_net(sk);
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_msg *mhdr = &tsk->phdr;
@@ -1080,7 +1092,7 @@ static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
/* Handle implied connection establishment */
if (unlikely(dest)) {
- rc = tipc_sendmsg(iocb, sock, m, dsz);
+ rc = __tipc_sendmsg(sock, m, dsz);
if (dsz && (dsz == rc))
tsk->sent_unacked = 1;
return rc;
@@ -1088,15 +1100,11 @@ static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
if (dsz > (uint)INT_MAX)
return -EMSGSIZE;
- if (iocb)
- lock_sock(sk);
-
if (unlikely(sock->state != SS_CONNECTED)) {
if (sock->state == SS_DISCONNECTING)
- rc = -EPIPE;
+ return -EPIPE;
else
- rc = -ENOTCONN;
- goto exit;
+ return -ENOTCONN;
}
timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
@@ -1108,7 +1116,7 @@ next:
send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
rc = tipc_msg_build(mhdr, m, sent, send, mtu, pktchain);
if (unlikely(rc < 0))
- goto exit;
+ return rc;
do {
if (likely(!tsk_conn_cong(tsk))) {
rc = tipc_link_xmit(net, pktchain, dnode, portid);
@@ -1133,9 +1141,7 @@ next:
if (rc)
__skb_queue_purge(pktchain);
} while (!rc);
-exit:
- if (iocb)
- release_sock(sk);
+
return sent ? sent : rc;
}
@@ -1947,7 +1953,7 @@ static int tipc_connect(struct socket *sock, struct sockaddr *dest,
if (!timeout)
m.msg_flags = MSG_DONTWAIT;
- res = tipc_sendmsg(NULL, sock, &m, 0);
+ res = __tipc_sendmsg(sock, &m, 0);
if ((res < 0) && (res != -EWOULDBLOCK))
goto exit;
@@ -2103,7 +2109,7 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
struct msghdr m = {NULL,};
tsk_advance_rx_queue(sk);
- tipc_send_packet(NULL, new_sock, &m, 0);
+ __tipc_send_stream(new_sock, &m, 0);
} else {
__skb_dequeue(&sk->sk_receive_queue);
__skb_queue_head(&new_sk->sk_receive_queue, buf);
--
1.7.9.5
--
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