io_uring: add remote task_work execution helper

All our task_work handling is targeted at the state in the io_kiocb
itself, which is what it is being used for. However, MSG_RING rolls its
own task_work handling, ignoring how that is usually done.

In preparation for switching MSG_RING to be able to use the normal
task_work handling, add io_req_task_work_add_remote() which allows the
caller to pass in the target io_ring_ctx.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 2 insertions, 0 deletions

diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h
index cd43924eed04..7a8641214509 100644
--- a/io_uring/io_uring.h
+++ b/io_uring/io_uring.h
@@ -73,6 +73,8 @@ struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
 			       unsigned issue_flags);
 
 void __io_req_task_work_add(struct io_kiocb *req, unsigned flags);
+void io_req_task_work_add_remote(struct io_kiocb *req, struct io_ring_ctx *ctx,
+				 unsigned flags);
 bool io_alloc_async_data(struct io_kiocb *req);
 void io_req_task_queue(struct io_kiocb *req);
 void io_req_task_complete(struct io_kiocb *req, struct io_tw_state *ts);