* [PATCH 4.14 12/74] net: make socket read/write_iter() honor IOCB_NOWAIT
[not found] <20200107205135.369001641@linuxfoundation.org>
@ 2020-01-07 20:54 ` Greg Kroah-Hartman
0 siblings, 0 replies; only message in thread
From: Greg Kroah-Hartman @ 2020-01-07 20:54 UTC (permalink / raw)
To: linux-kernel
Cc: Greg Kroah-Hartman, stable, netdev, David Miller, Jens Axboe,
Sasha Levin
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 aab65277314d..5b134a6b6216 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -891,7 +891,7 @@ 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)
@@ -916,7 +916,7 @@ 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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