在 2021/10/23 下午7:13, Pavel Begunkov 写道:
If an opcode doesn't support polling, just let it be executed
synchronously in iowq, otherwise it will do a nonblock attempt just to
fail in io_arm_poll_handler() and return back to blocking execution.
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
Reviewed-by: Hao Xu <haoxu@xxxxxxxxxxxxxxxxx>
fs/io_uring.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index bff911f951ed..c6f32fcf387b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6741,9 +6741,13 @@ static void io_wq_submit_work(struct io_wq_work *work)
}
if (req->flags & REQ_F_FORCE_ASYNC) {
- needs_poll = req->file && file_can_poll(req->file);
- if (needs_poll)
+ const struct io_op_def *def = &io_op_defs[req->opcode];
+ bool opcode_poll = def->pollin || def->pollout;
+
+ if (opcode_poll && file_can_poll(req->file)) {
+ needs_poll = true;
issue_flags |= IO_URING_F_NONBLOCK;
+ }
}
do {
