fsnotify: Determine lock in fsnotify_destroy_marks()

Instead of passing spinlock into fsnotify_destroy_marks() determine it
directly in that function from the connector type. This will reduce code
churn when changing lock protecting list of marks.

Reviewed-by: Miklos Szeredi <mszeredi@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/notify/fsnotify.h

@@ -26,19 +26,17 @@ extern struct inode *fsnotify_destroy_inode_mark(struct fsnotify_mark *mark);
 extern struct fsnotify_mark *fsnotify_find_mark(
 					struct fsnotify_mark_connector *conn,
 					struct fsnotify_group *group);
-/* Destroy all marks connected via given connector protected by 'lock' */
-extern void fsnotify_destroy_marks(struct fsnotify_mark_connector *conn,
-				   spinlock_t *lock);
+/* Destroy all marks connected via given connector */
+extern void fsnotify_destroy_marks(struct fsnotify_mark_connector *conn);
 /* run the list of all marks associated with inode and destroy them */
 static inline void fsnotify_clear_marks_by_inode(struct inode *inode)
 {
-	fsnotify_destroy_marks(inode->i_fsnotify_marks, &inode->i_lock);
+	fsnotify_destroy_marks(inode->i_fsnotify_marks);
 }
 /* run the list of all marks associated with vfsmount and destroy them */
 static inline void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
 {
-	fsnotify_destroy_marks(real_mount(mnt)->mnt_fsnotify_marks,
-			       &mnt->mnt_root->d_lock);
+	fsnotify_destroy_marks(real_mount(mnt)->mnt_fsnotify_marks);
 }
 /* prepare for freeing all marks associated with given group */
 extern void fsnotify_detach_group_marks(struct fsnotify_group *group);

fs/notify/mark.c

@@ -572,14 +572,19 @@ void fsnotify_detach_group_marks(struct fsnotify_group *group)
 	}
 }
 
-void fsnotify_destroy_marks(struct fsnotify_mark_connector *conn,
-			    spinlock_t *lock)
+void fsnotify_destroy_marks(struct fsnotify_mark_connector *conn)
 {
 	struct fsnotify_mark *mark;
+	spinlock_t *lock;
 
 	if (!conn)
 		return;
 
+	if (conn->flags & FSNOTIFY_OBJ_TYPE_INODE)
+		lock = &conn->inode->i_lock;
+	else
+		lock = &conn->mnt->mnt_root->d_lock;
+
 	while (1) {
 		/*
 		 * We have to be careful since we can race with e.g.