net: rename sk_clone to sk_clone_lock

Make clear that sk_clone() and inet_csk_clone() return a locked socket.

Add _lock() prefix and kerneldoc.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index e6db62e..dbf9aab 100644 (file)
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -143,9 +143,9 @@ static inline void *inet_csk_ca(const struct sock *sk)
        return (void *)inet_csk(sk)->icsk_ca_priv;
 }
 
-extern struct sock *inet_csk_clone(struct sock *sk,
-                                  const struct request_sock *req,
-                                  const gfp_t priority);
+extern struct sock *inet_csk_clone_lock(const struct sock *sk,
+                                       const struct request_sock *req,
+                                       const gfp_t priority);
 
 enum inet_csk_ack_state_t {
        ICSK_ACK_SCHED  = 1,

diff --git a/include/net/sock.h b/include/net/sock.h
index abb6e0f..67cd458 100644 (file)
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1089,8 +1089,8 @@ extern struct sock                *sk_alloc(struct net *net, int family,
                                          struct proto *prot);
 extern void                    sk_free(struct sock *sk);
 extern void                    sk_release_kernel(struct sock *sk);
-extern struct sock             *sk_clone(const struct sock *sk,
-                                         const gfp_t priority);
+extern struct sock             *sk_clone_lock(const struct sock *sk,
+                                              const gfp_t priority);
 
 extern struct sk_buff          *sock_wmalloc(struct sock *sk,
                                              unsigned long size, int force,

diff --git a/net/core/sock.c b/net/core/sock.c
index 4ed7b1d..2de9dc2 100644 (file)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1204,7 +1204,14 @@ void sk_release_kernel(struct sock *sk)
 }
 EXPORT_SYMBOL(sk_release_kernel);
 
-struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
+/**
+ *     sk_clone_lock - clone a socket, and lock its clone
+ *     @sk: the socket to clone
+ *     @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
+ *
+ *     Caller must unlock socket even in error path (bh_unlock_sock(newsk))
+ */
+struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
 {
        struct sock *newsk;
 
@@ -1297,7 +1304,7 @@ struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
 out:
        return newsk;
 }
-EXPORT_SYMBOL_GPL(sk_clone);
+EXPORT_SYMBOL_GPL(sk_clone_lock);
 
 void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
 {

diff --git a/net/dccp/minisocks.c b/net/dccp/minisocks.c
index d7041a0..563b7c7 100644 (file)
--- a/net/dccp/minisocks.c
+++ b/net/dccp/minisocks.c
@@ -100,7 +100,7 @@ struct sock *dccp_create_openreq_child(struct sock *sk,
         *   (* Generate a new socket and switch to that socket *)
         *   Set S := new socket for this port pair
         */
-       struct sock *newsk = inet_csk_clone(sk, req, GFP_ATOMIC);
+       struct sock *newsk = inet_csk_clone_lock(sk, req, GFP_ATOMIC);
 
        if (newsk != NULL) {
                struct dccp_request_sock *dreq = dccp_rsk(req);

diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index c14d88a..a598768 100644 (file)
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -588,10 +588,19 @@ void inet_csk_reqsk_queue_prune(struct sock *parent,
 }
 EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune);
 
-struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req,
-                           const gfp_t priority)
+/**
+ *     inet_csk_clone_lock - clone an inet socket, and lock its clone
+ *     @sk: the socket to clone
+ *     @req: request_sock
+ *     @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
+ *
+ *     Caller must unlock socket even in error path (bh_unlock_sock(newsk))
+ */
+struct sock *inet_csk_clone_lock(const struct sock *sk,
+                                const struct request_sock *req,
+                                const gfp_t priority)
 {
-       struct sock *newsk = sk_clone(sk, priority);
+       struct sock *newsk = sk_clone_lock(sk, priority);
 
        if (newsk != NULL) {
                struct inet_connection_sock *newicsk = inet_csk(newsk);
@@ -615,7 +624,7 @@ struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req,
        }
        return newsk;
 }
-EXPORT_SYMBOL_GPL(inet_csk_clone);
+EXPORT_SYMBOL_GPL(inet_csk_clone_lock);
 
 /*
  * At this point, there should be no process reference to this

diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 66363b6..0a7e339 100644 (file)
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -425,7 +425,7 @@ static inline void TCP_ECN_openreq_child(struct tcp_sock *tp,
  */
 struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req, struct sk_buff *skb)
 {
-       struct sock *newsk = inet_csk_clone(sk, req, GFP_ATOMIC);
+       struct sock *newsk = inet_csk_clone_lock(sk, req, GFP_ATOMIC);
 
        if (newsk != NULL) {
                const struct inet_request_sock *ireq = inet_rsk(req);