io_uring: assign non-fixed early for async work

We defer file assignment to ensure that fixed files work with links
between a direct accept/open and the links that follow it. But this has
the side effect that normal file assignment is then not complete by the
time that request submission has been done.

For deferred execution, if the file is a regular file, assign it when
we do the async prep anyway.

Signed-off-by: Jens Axboe <[email protected]>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index e01f595f5b7d7bd2b3b84dfe498f13ea1037b02b..91de361ea9aba2d0d83718f150437382235945c1 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6947,7 +6947,12 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 
 static int io_req_prep_async(struct io_kiocb *req)
 {
-       if (!io_op_defs[req->opcode].needs_async_setup)
+       const struct io_op_def *def = &io_op_defs[req->opcode];
+
+       /* assign early for deferred execution for non-fixed file */
+       if (def->needs_file && !(req->flags & REQ_F_FIXED_FILE))
+               req->file = io_file_get_normal(req, req->fd);
+       if (!def->needs_async_setup)
                return 0;
        if (WARN_ON_ONCE(req_has_async_data(req)))
                return -EFAULT;