io_uring: ensure that fsnotify is always called

Ensure that we call fsnotify_modify() if we write a file, and that we
do fsnotify_access() if we read it. This enables anyone using inotify
on the file to get notified.

Ditto for fallocate, ensure that fsnotify_modify() is called.

Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: axboe

fs/io_uring.c

@@ -2973,8 +2973,12 @@ static bool io_rw_should_reissue(struct io_kiocb *req)
 
 static bool __io_complete_rw_common(struct io_kiocb *req, long res)
 {
-	if (req->rw.kiocb.ki_flags & IOCB_WRITE)
+	if (req->rw.kiocb.ki_flags & IOCB_WRITE) {
 		kiocb_end_write(req);
+		fsnotify_modify(req->file);
+	} else {
+		fsnotify_access(req->file);
+	}
 	if (unlikely(res != req->result)) {
 		if ((res == -EAGAIN || res == -EOPNOTSUPP) &&
 		    io_rw_should_reissue(req)) {
@@ -4537,6 +4541,8 @@ static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags)
 				req->sync.len);
 	if (ret < 0)
 		req_set_fail(req);
+	else
+		fsnotify_modify(req->file);
 	io_req_complete(req, ret);
 	return 0;
 }