binder: frozen notification binder_features flag

Add a flag to binder_features to indicate that the freeze notification
feature is available.

Signed-off-by: Yu-Ting Tseng <[email protected]>
Acked-by: Carlos Llamas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Yu-Ting Tseng

drivers/android/binderfs.c

@@ -58,6 +58,7 @@ enum binderfs_stats_mode {
 struct binder_features {
 	bool oneway_spam_detection;
 	bool extended_error;
+	bool freeze_notification;
 };
 
 static const struct constant_table binderfs_param_stats[] = {
@@ -74,6 +75,7 @@ static const struct fs_parameter_spec binderfs_fs_parameters[] = {
 static struct binder_features binder_features = {
 	.oneway_spam_detection = true,
 	.extended_error = true,
+	.freeze_notification = true,
 };
 
 static inline struct binderfs_info *BINDERFS_SB(const struct super_block *sb)
@@ -608,6 +610,12 @@ static int init_binder_features(struct super_block *sb)
 	if (IS_ERR(dentry))
 		return PTR_ERR(dentry);
 
+	dentry = binderfs_create_file(dir, "freeze_notification",
+				      &binder_features_fops,
+				      &binder_features.freeze_notification);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
+
 	return 0;
 }
 

tools/testing/selftests/filesystems/binderfs/binderfs_test.c

@@ -65,6 +65,7 @@ static int __do_binderfs_test(struct __test_metadata *_metadata)
 	static const char * const binder_features[] = {
 		"oneway_spam_detection",
 		"extended_error",
+		"freeze_notification",
 	};
 
 	change_mountns(_metadata);