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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 <tom@quantonium.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2017-07-28 16:22:41 -07:00 • committed by David S. Miller
parent 29fda25a2d
commit 306b13eb3c
7 changed files with 95 additions and 13 deletions
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22
net/core/sock.c
View file

@ -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
*/