inet: Remove explicit write references to sk/inet in ip_append_data

In order to allow simultaneous calls to ip_append_data on the same
socket, it must not modify any shared state in sk or inet (other
than those that are designed to allow that such as atomic counters).

This patch abstracts out write references to sk and inet_sk in
ip_append_data and its friends so that we may use the underlying
code in parallel.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 9 deletions

diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index 6e6dfd75768..7a37369f8ea 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -86,6 +86,19 @@ static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
         return (struct inet_request_sock *)sk;
 }
 
+struct inet_cork {
+        unsigned int            flags;
+        unsigned int            fragsize;
+        struct ip_options       *opt;
+        struct dst_entry        *dst;
+        int                     length; /* Total length of all frames */
+        __be32                  addr;
+        struct flowi            fl;
+        struct page             *page;
+        u32                     off;
+        u8                      tx_flags;
+};
+
 struct ip_mc_socklist;
 struct ipv6_pinfo;
 struct rtable;
@@ -143,15 +156,7 @@ struct inet_sock {
         int                     mc_index;
         __be32                  mc_addr;
         struct ip_mc_socklist __rcu     *mc_list;
-        struct {
-                unsigned int            flags;
-                unsigned int            fragsize;
-                struct ip_options       *opt;
-                struct dst_entry        *dst;
-                int                     length; /* Total length of all frames */
-                __be32                  addr;
-                struct flowi            fl;
-        } cork;
+        struct inet_cork        cork;
 };
 
 #define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */