xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

io_uring: add support for sendmsg()

Browse Source 
This is done through IORING_OP_SENDMSG. There's a new sqe->msg_flags
for the flags argument, and the msghdr struct is passed in the
sqe->addr field.

We use MSG_DONTWAIT to force an inline fast path if sendmsg() 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 13:34:07 -06:00
parent 9e645e1105
commit 0fa03c624d
4 changed files with 53 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
fs/io_uring.c
View File

@@ -1390,6 +1390,43 @@ 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)
struct socket *sock;
int ret;
if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
sock = sock_from_file(req->file, &ret);
if (sock) {
struct user_msghdr __user *msg;
unsigned flags;
flags = READ_ONCE(sqe->msg_flags);
if (flags & MSG_DONTWAIT)
req->flags |= REQ_F_NOWAIT;
else if (force_nonblock)
flags |= MSG_DONTWAIT;
msg = (struct user_msghdr __user *) (unsigned long)
READ_ONCE(sqe->addr);
ret = __sys_sendmsg_sock(sock, msg, flags);
if (force_nonblock && ret == -EAGAIN)
return ret;
}
io_cqring_add_event(req->ctx, sqe->user_data, ret);
io_put_req(req);
return 0;
#else
return -EOPNOTSUPP;
#endif
}
static void io_poll_remove_one(struct io_kiocb *req)
{
struct io_poll_iocb *poll = &req->poll;
@@ -1675,6 +1712,9 @@ static int __io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
case IORING_OP_SYNC_FILE_RANGE:
ret = io_sync_file_range(req, s->sqe, force_nonblock);
break;
case IORING_OP_SENDMSG:
ret = io_sendmsg(req, s->sqe, force_nonblock);
break;
default:
ret = -EINVAL;
break;