| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 040/191] net: make socket read/write_iter() honor IOCB_NOWAIT | Date | Tue, 7 Jan 2020 21:52:40 +0100 |
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From: Jens Axboe <axboe@kernel.dk>
[ Upstream commit ebfcd8955c0b52eb793bcbc9e71140e3d0cdb228 ]
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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- net/socket.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/socket.c b/net/socket.c index d7a106028f0e..ca8de9e1582d 100644 --- a/net/socket.c +++ b/net/socket.c @@ -955,7 +955,7 @@ 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) @@ -980,7 +980,7 @@ 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) -- 2.20.1
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