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authorEric Dumazet <eric.dumazet@gmail.com>2009-06-16 10:12:03 +0000
committerDavid S. Miller <davem@davemloft.net>2009-06-17 04:31:25 -0700
commitc564039fd83ea16a86a96d52632794b24849e507 (patch)
tree42c9f525d08ea2e7d36c0231cc628587a175a39b /include/net
parent1d4ac5d5ef9dd965ae211ebe8acbf83dc4d9571b (diff)
downloadblackbird-op-linux-c564039fd83ea16a86a96d52632794b24849e507.tar.gz
blackbird-op-linux-c564039fd83ea16a86a96d52632794b24849e507.zip
net: sk_wmem_alloc has initial value of one, not zero
commit 2b85a34e911bf483c27cfdd124aeb1605145dc80 (net: No more expensive sock_hold()/sock_put() on each tx) changed initial sk_wmem_alloc value. Some protocols check sk_wmem_alloc value to determine if a timer must delay socket deallocation. We must take care of the sk_wmem_alloc value being one instead of zero when no write allocations are pending. Reported by Ingo Molnar, and full diagnostic from David Miller. This patch introduces three helpers to get read/write allocations and a followup patch will use these helpers to report correct write allocations to user. Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/sock.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/include/net/sock.h b/include/net/sock.h
index 010e14a93c92..570c7a12b54e 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1206,6 +1206,39 @@ static inline int skb_copy_to_page(struct sock *sk, char __user *from,
return 0;
}
+/**
+ * sk_wmem_alloc_get - returns write allocations
+ * @sk: socket
+ *
+ * Returns sk_wmem_alloc minus initial offset of one
+ */
+static inline int sk_wmem_alloc_get(const struct sock *sk)
+{
+ return atomic_read(&sk->sk_wmem_alloc) - 1;
+}
+
+/**
+ * sk_rmem_alloc_get - returns read allocations
+ * @sk: socket
+ *
+ * Returns sk_rmem_alloc
+ */
+static inline int sk_rmem_alloc_get(const struct sock *sk)
+{
+ return atomic_read(&sk->sk_rmem_alloc);
+}
+
+/**
+ * sk_has_allocations - check if allocations are outstanding
+ * @sk: socket
+ *
+ * Returns true if socket has write or read allocations
+ */
+static inline int sk_has_allocations(const struct sock *sk)
+{
+ return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk);
+}
+
/*
* Queue a received datagram if it will fit. Stream and sequenced
* protocols can't normally use this as they need to fit buffers in
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