[INET]: Just rename the TCP hashtable functions/structs to inet_

This is to break down the complexity of the series of patches,
making it very clear that this one just does:

1. renames tcp_ prefixed hashtable functions and data structures that
   were already mostly generic to inet_ to share it with DCCP and
   other INET transport protocols.

2. Removes not used functions (__tb_head & tb_head)

3. Removes some leftover prototypes in the headers (tcp_bucket_unlock &
   tcp_v4_build_header)

Next changesets will move tcp_sk(sk)->bind_hash to inet_sock so that we can
make functions such as tcp_inherit_port, __tcp_inherit_port, tcp_v4_get_port,
__tcp_put_port,  generic and get others like tcp_destroy_sock closer to generic
(tcp_orphan_count will go to sk->sk_prot to allow this).

Eventually most of these functions will be used passing the transport protocol
inet_hashinfo structure.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 20159a3..1ec03db 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -272,6 +272,9 @@
 DEFINE_SNMP_STAT(struct tcp_mib, tcp_statistics);
 
 kmem_cache_t *tcp_bucket_cachep;
+
+EXPORT_SYMBOL_GPL(tcp_bucket_cachep);
+
 kmem_cache_t *tcp_timewait_cachep;
 
 atomic_t tcp_orphan_count = ATOMIC_INIT(0);
@@ -2259,7 +2262,7 @@
 					   sizeof(skb->cb));
 
 	tcp_bucket_cachep = kmem_cache_create("tcp_bind_bucket",
-					      sizeof(struct tcp_bind_bucket),
+					      sizeof(struct inet_bind_bucket),
 					      0, SLAB_HWCACHE_ALIGN,
 					      NULL, NULL);
 	if (!tcp_bucket_cachep)
@@ -2277,9 +2280,9 @@
 	 *
 	 * The methodology is similar to that of the buffer cache.
 	 */
-	tcp_ehash = (struct tcp_ehash_bucket *)
+	tcp_ehash =
 		alloc_large_system_hash("TCP established",
-					sizeof(struct tcp_ehash_bucket),
+					sizeof(struct inet_ehash_bucket),
 					thash_entries,
 					(num_physpages >= 128 * 1024) ?
 						(25 - PAGE_SHIFT) :
@@ -2294,9 +2297,9 @@
 		INIT_HLIST_HEAD(&tcp_ehash[i].chain);
 	}
 
-	tcp_bhash = (struct tcp_bind_hashbucket *)
+	tcp_bhash =
 		alloc_large_system_hash("TCP bind",
-					sizeof(struct tcp_bind_hashbucket),
+					sizeof(struct inet_bind_hashbucket),
 					tcp_ehash_size,
 					(num_physpages >= 128 * 1024) ?
 						(25 - PAGE_SHIFT) :
@@ -2315,7 +2318,7 @@
 	 * on available memory.
 	 */
 	for (order = 0; ((1 << order) << PAGE_SHIFT) <
-			(tcp_bhash_size * sizeof(struct tcp_bind_hashbucket));
+			(tcp_bhash_size * sizeof(struct inet_bind_hashbucket));
 			order++)
 		;
 	if (order >= 4) {