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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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8
net/socket.c
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@ -2494,6 +2494,14 @@ out_freeiov:
* BSD recvmsg interface
*/
long __sys_recvmsg_sock(struct socket *sock, struct user_msghdr __user *msg,
unsigned int flags)
{
struct msghdr msg_sys;
return ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
}
long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
bool forbid_cmsg_compat)
{