linux-kernel - [PATCH v19 4/5] binder: add transaction

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Message-ID: <20250725183811.409580-5-cmllamas@google.com>
Date: Fri, 25 Jul 2025 18:37:47 +0000
From: Carlos Llamas <cmllamas@...gle.com>
To: Alice Ryhl <aliceryhl@...gle.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Arve Hjønnevåg" <arve@...roid.com>, Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>, 
	Joel Fernandes <joelagnelf@...dia.com>, Christian Brauner <brauner@...nel.org>, 
	Carlos Llamas <cmllamas@...gle.com>, Suren Baghdasaryan <surenb@...gle.com>, Shuah Khan <shuah@...nel.org>, 
	Yu-Ting Tseng <yutingtseng@...gle.com>, Li Li <dualli@...gle.com>, 
	Ba Jing <bajing@...s.chinamobile.com>
Cc: Tiffany Yang <ynaffit@...gle.com>, John Stultz <jstultz@...gle.com>, 
	Shai Barack <shayba@...gle.com>, "Thiébaud Weksteen" <tweek@...gle.com>, kernel-team@...roid.com, 
	linux-kernel@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>
Subject: [PATCH v19 4/5] binder: add transaction_report feature entry

From: Li Li <dualli@...gle.com>

Add "transaction_report" to the binderfs feature list, to help userspace
determine if the "BINDER_CMD_REPORT" generic netlink api is supported by
the binder driver.

Signed-off-by: Li Li <dualli@...gle.com>
Signed-off-by: Carlos Llamas <cmllamas@...gle.com>
---
 drivers/android/binderfs.c                                | 8 ++++++++
 .../selftests/filesystems/binderfs/binderfs_test.c        | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
index 4f827152d18e..f74a7e380261 100644
--- a/drivers/android/binderfs.c
+++ b/drivers/android/binderfs.c
@@ -59,6 +59,7 @@ struct binder_features {
 	bool oneway_spam_detection;
 	bool extended_error;
 	bool freeze_notification;
+	bool transaction_report;
 };
 
 static const struct constant_table binderfs_param_stats[] = {
@@ -76,6 +77,7 @@ static struct binder_features binder_features = {
 	.oneway_spam_detection = true,
 	.extended_error = true,
 	.freeze_notification = true,
+	.transaction_report = true,
 };
 
 static inline struct binderfs_info *BINDERFS_SB(const struct super_block *sb)
@@ -616,6 +618,12 @@ static int init_binder_features(struct super_block *sb)
 	if (IS_ERR(dentry))
 		return PTR_ERR(dentry);
 
+	dentry = binderfs_create_file(dir, "transaction_report",
+				      &binder_features_fops,
+				      &binder_features.transaction_report);
+	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 81db85a5cc16..39a68078a79b 100644
--- 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)
 		"oneway_spam_detection",
 		"extended_error",
 		"freeze_notification",
+		"transaction_report",
 	};
 
 	change_mountns(_metadata);
-- 
2.50.1.470.g6ba607880d-goog