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io_uring: add support for recvmsg() 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
fs/io_uring.c
View File

@ -1390,10 +1390,12 @@ static int io_sync_file_range(struct io_kiocb *req,
return 0;
}
static int io_sendmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
bool force_nonblock)
{
#if defined(CONFIG_NET)
static int io_send_recvmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
bool force_nonblock,
long (*fn)(struct socket *, struct user_msghdr __user *,
unsigned int))
{
struct socket *sock;
int ret;
@ -1414,7 +1416,7 @@ static int io_sendmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
msg = (struct user_msghdr __user *) (unsigned long)
READ_ONCE(sqe->addr);
ret = __sys_sendmsg_sock(sock, msg, flags);
ret = fn(sock, msg, flags);
if (force_nonblock && ret == -EAGAIN)
return ret;
}
@ -1422,6 +1424,24 @@ static int io_sendmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
io_cqring_add_event(req->ctx, sqe->user_data, ret);
io_put_req(req);
return 0;
}
#endif
static int io_sendmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
bool force_nonblock)
{
#if defined(CONFIG_NET)
return io_send_recvmsg(req, sqe, force_nonblock, __sys_sendmsg_sock);
#else
return -EOPNOTSUPP;
#endif
}
static int io_recvmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
bool force_nonblock)
{
#if defined(CONFIG_NET)
return io_send_recvmsg(req, sqe, force_nonblock, __sys_recvmsg_sock);
#else
return -EOPNOTSUPP;
#endif
@ -1715,6 +1735,9 @@ static int __io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
case IORING_OP_SENDMSG:
ret = io_sendmsg(req, s->sqe, force_nonblock);
break;
case IORING_OP_RECVMSG:
ret = io_recvmsg(req, s->sqe, force_nonblock);
break;
default:
ret = -EINVAL;
break;

3
include/linux/socket.h
View File

@ -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,

1
include/uapi/linux/io_uring.h
View File

@ -60,6 +60,7 @@ struct io_uring_sqe {
#define IORING_OP_POLL_REMOVE 7
#define IORING_OP_SYNC_FILE_RANGE 8
#define IORING_OP_SENDMSG 9
#define IORING_OP_RECVMSG 10
/*
* sqe->fsync_flags

8
net/socket.c
View File

@ -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)
{