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proto_ops: Add locked held versions of sendmsg and sendpage

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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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Tom Herbert 2017-07-28 16:22:41 -07:00 • committed by David S. Miller
commit 306b13eb3c
7 changed files with 95 additions and 13 deletions
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27
net/socket.c
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@ -652,6 +652,20 @@ int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
}
EXPORT_SYMBOL(kernel_sendmsg);
int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
struct kvec *vec, size_t num, size_t size)
{
struct socket *sock = sk->sk_socket;
if (!sock->ops->sendmsg_locked)
sock_no_sendmsg_locked(sk, msg, size);
iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
}
EXPORT_SYMBOL(kernel_sendmsg_locked);
static bool skb_is_err_queue(const struct sk_buff *skb)
{
/* pkt_type of skbs enqueued on the error queue are set to
@ -3376,6 +3390,19 @@ int kernel_sendpage(struct socket *sock, struct page *page, int offset,
}
EXPORT_SYMBOL(kernel_sendpage);
int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
size_t size, int flags)
{
struct socket *sock = sk->sk_socket;
if (sock->ops->sendpage_locked)
return sock->ops->sendpage_locked(sk, page, offset, size,
flags);
return sock_no_sendpage_locked(sk, page, offset, size, flags);
}
EXPORT_SYMBOL(kernel_sendpage_locked);
int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
{
mm_segment_t oldfs = get_fs();