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io_uring: add support for recvmsg()

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This is done through IORING_OP_RECVMSG. This opcode uses the same
sqe->msg_flags that IORING_OP_SENDMSG added, and we pass in the
msghdr struct in the sqe->addr field as well.

We use MSG_DONTWAIT to force an inline fast path if recvmsg() doesn't
block, and punt to async execution if it would have.

Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-04-19 13:38:09 -06:00
parent 0fa03c624d
commit aa1fa28fc7
4 changed files with 39 additions and 4 deletions
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3
include/linux/socket.h
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@ -378,6 +378,9 @@ extern int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg,
extern long __sys_sendmsg_sock(struct socket *sock,
struct user_msghdr __user *msg,
unsigned int flags);
extern long __sys_recvmsg_sock(struct socket *sock,
struct user_msghdr __user *msg,
unsigned int flags);
/* helpers which do the actual work for syscalls */
extern int __sys_recvfrom(int fd, void __user *ubuf, size_t size,