proto_ops: Add locked held versions of sendmsg and sendpage
Add new proto_ops sendmsg_locked and sendpage_locked that can be
called when the socket lock is already held. Correspondingly, add
kernel_sendmsg_locked and kernel_sendpage_locked as front end
functions.
These functions will be used in zero proxy so that we can take
the socket lock in a ULP sendmsg/sendpage and then directly call the
backend transport proto_ops functions.
Signed-off-by: Tom Herbert <tom@quantonium.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/sock.c b/net/core/sock.c
index ac2a404..742f68c 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2500,6 +2500,12 @@ int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
}
EXPORT_SYMBOL(sock_no_sendmsg);
+int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
+{
+ return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_sendmsg_locked);
+
int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
int flags)
{
@@ -2528,6 +2534,22 @@ ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, siz
}
EXPORT_SYMBOL(sock_no_sendpage);
+ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
+ int offset, size_t size, int flags)
+{
+ ssize_t res;
+ struct msghdr msg = {.msg_flags = flags};
+ struct kvec iov;
+ char *kaddr = kmap(page);
+
+ iov.iov_base = kaddr + offset;
+ iov.iov_len = size;
+ res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
+ kunmap(page);
+ return res;
+}
+EXPORT_SYMBOL(sock_no_sendpage_locked);
+
/*
* Default Socket Callbacks
*/