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 <yutingtseng@google.com>
Acked-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20240709070047.4055369-6-yutingtseng@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
index 3001d754ac369ebdff6d994c9dabe03eb60cccf5..ad1fa7abc3232d94091f219ca5ce84d1bc592b08 100644 (file)
--- a/drivers/android/binderfs.c
+++ b/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;
 }
 

diff --git a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
index 5f362c0fd890566e0236554c115c5c7b418114f6..319567f0fae140132f73a794624d42db45228bd9 100644 (file)
--- a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
+++ b/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);