io_uring: remove files pointer in cancellation functions

When doing cancellation, we use a parameter to indicate where it's from
do_exit or exec. So a boolean value is good enough for this, remove the
struct files* as it is not necessary.
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
[axboe: fixup io_uring_files_cancel for !CONFIG_IO_URING]
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -9213,9 +9213,9 @@ static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd)
 	}
 }
 
-void __io_uring_cancel(struct files_struct *files)
+void __io_uring_cancel(bool cancel_all)
 {
-	io_uring_cancel_generic(!files, NULL);
+	io_uring_cancel_generic(cancel_all, NULL);
 }
 
 static void *io_uring_validate_mmap_request(struct file *file,

include/linux/io_uring.h

@@ -7,18 +7,18 @@
 
 #if defined(CONFIG_IO_URING)
 struct sock *io_uring_get_socket(struct file *file);
-void __io_uring_cancel(struct files_struct *files);
+void __io_uring_cancel(bool cancel_all);
 void __io_uring_free(struct task_struct *tsk);
 
-static inline void io_uring_files_cancel(struct files_struct *files)
+static inline void io_uring_files_cancel(void)
 {
 	if (current->io_uring)
-		__io_uring_cancel(files);
+		__io_uring_cancel(false);
 }
 static inline void io_uring_task_cancel(void)
 {
 	if (current->io_uring)
-		__io_uring_cancel(NULL);
+		__io_uring_cancel(true);
 }
 static inline void io_uring_free(struct task_struct *tsk)
 {
@@ -33,7 +33,7 @@ static inline struct sock *io_uring_get_socket(struct file *file)
 static inline void io_uring_task_cancel(void)
 {
 }
-static inline void io_uring_files_cancel(struct files_struct *files)
+static inline void io_uring_files_cancel(void)
 {
 }
 static inline void io_uring_free(struct task_struct *tsk)

kernel/exit.c

@@ -777,7 +777,7 @@ void __noreturn do_exit(long code)
 		schedule();
 	}
 
-	io_uring_files_cancel(tsk->files);
+	io_uring_files_cancel();
 	exit_signals(tsk);  /* sets PF_EXITING */
 
 	/* sync mm's RSS info before statistics gathering */