io_uring: allow AT_FDCWD for non-file openat/openat2/statx

to #26323588

commit 0b5faf6ba7fb78bb1fe7336d23ea1978386a6c3a upstream.

Don't just check for dirfd == -1, we should allow AT_FDCWD as well for
relative lookups.
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>

fs/io_uring.c

@@ -4540,7 +4540,7 @@ static int io_req_needs_file(struct io_kiocb *req, int fd)
 {
 	if (!io_op_defs[req->opcode].needs_file)
 		return 0;
-	if (fd == -1 && io_op_defs[req->opcode].fd_non_neg)
+	if ((fd == -1 || fd == AT_FDCWD) && io_op_defs[req->opcode].fd_non_neg)
 		return 0;
 	return 1;
 }