net: make socket read/write_iter() honor IOCB_NOWAIT

The socket read/write helpers only look at the file O_NONBLOCK. not
the iocb IOCB_NOWAIT flag. This breaks users like preadv2/pwritev2
and io_uring that rely on not having the file itself marked nonblocking,
but rather the iocb itself.

Cc: netdev@vger.kernel.org
Acked-by: David Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/net/socket.c b/net/socket.c
index b343db1..b116e58 100644 (file)
--- a/net/socket.c
+++ b/net/socket.c
@@ -957,7 +957,7 @@ static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
                             .msg_iocb = iocb};
        ssize_t res;
 
-       if (file->f_flags & O_NONBLOCK)
+       if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
                msg.msg_flags = MSG_DONTWAIT;
 
        if (iocb->ki_pos != 0)
@@ -982,7 +982,7 @@ static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
        if (iocb->ki_pos != 0)
                return -ESPIPE;
 
-       if (file->f_flags & O_NONBLOCK)
+       if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
                msg.msg_flags = MSG_DONTWAIT;
 
        if (sock->type == SOCK_SEQPACKET)