From nobody Tue Oct 7 21:46:30 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5C63E2356C4; Tue, 3 Jun 2025 11:27:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748950060; cv=none; b=YFgRe4G6DewwbIyzjSokz/A4YMifYpd/f/H6l/LKZl41p1InSf5AQE2CK1dOZQIGeVWF1yA6f+vlw4Usf9HGG+rPwJ6lqQ0tBPXmAn5acQQSDIwQ5s8zkQ3FqqsvnAZbsPSYd3/vQatEN03p1SzaE2yWke/+Zc5urdZ68Qq04O4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748950060; c=relaxed/simple; bh=qsINcmyRJS/rIXB02gJnsJeatb4Kiva7Sr9N4CSqWBI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=TA3Wr56CBI7mc9WnandMnYiagP+xWSqOhLAZOQy0jvExdFq7hraLcSH5z9wS6LXLFnfjMuOqoyxRD6ZnmFvI2VqmyVFgTE6Fwivyrysso3wgiqYs5xx5IiAhen9yr0nN3SzuorpBMcB4LIp4/HLXko4qHNcHvBt+OT0QuzDMaik= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HOOLH/os; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HOOLH/os" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5F181C4CEF0; Tue, 3 Jun 2025 11:27:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1748950060; bh=qsINcmyRJS/rIXB02gJnsJeatb4Kiva7Sr9N4CSqWBI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=HOOLH/os8P9KPgDWMwecLGrib1Od0uhBpJvczPDdyRXQNUVrnKl/xsuH/tW4KAVFV jMA4n4d7AHTMS423g0UIIaHw7nMIKkp/D2Vj5Wgw2Nc/RlnOB7AQAVyBSnRlSvuFm6 TS8ySp54pwlJ73dd7UShI4IQ7U0sZYMRIa5yNHxXmcuAvNsCmWK4j3FWmnmBnHgWFl Zq6B4N+phqOIw5gh0vzwqCsD0cMQ5SMM2TIO+vvJWJ4/cvpqzXU4L/pjHV3I0jDCHb av+mFciz8Xu1PKjkqSumS1ZCTwtTYHUtAVr6cTHcakn74whgh/hbK5W8faQZKn5NUq oayoP2XMVL6Sw== From: Jeff Layton Date: Tue, 03 Jun 2025 07:27:18 -0400 Subject: [PATCH v13 7/9] ref_tracker: add a way to create a symlink to the ref_tracker_dir debugfs file Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250603-reftrack-dbgfs-v13-7-7b2a425019d8@kernel.org> References: <20250603-reftrack-dbgfs-v13-0-7b2a425019d8@kernel.org> In-Reply-To: <20250603-reftrack-dbgfs-v13-0-7b2a425019d8@kernel.org> To: Andrew Morton , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin Cc: Krzysztof Karas , Kuniyuki Iwashima , Qasim Ijaz , Nathan Chancellor , Andrew Lunn , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, Jeff Layton X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3044; i=jlayton@kernel.org; h=from:subject:message-id; bh=qsINcmyRJS/rIXB02gJnsJeatb4Kiva7Sr9N4CSqWBI=; b=owEBbQKS/ZANAwAKAQAOaEEZVoIVAcsmYgBoPtwaZNFk7Lyny66oAt+EwLN9ptUuT9lnz0z8B S1BqrIUsPKJAjMEAAEKAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCaD7cGgAKCRAADmhBGVaC FeiZEACLNbkqaUhiBGStZAF/Qz5Mgq6iIxUH9BbApYNRQosggDg7Oq5+RKSXYrlUBuN7PgajYqb TFFEdExexPq7Nj+0lmgPE0hsLOLL3fStubl+Vvl4jQjQAE/nBi65JfEvjGBHzhzrEB0se09P550 KJdvT/0e9k7jc5+MyKTkzrRmzi3cfCFwsguLajldYXF4RqA/sG61wA2KiNRrNwso/6KBeEN5q5y FiqkIv7CKUnibgdYben0SjEjYX2sOicvZ3H0wUd2xN+cbl9Gqw0w0FcRvcvVuhOWVPmCzigsb+l RyITNWamfFU6LO+UwDu4QM/Wr7oFCFVV461o/xSfPT4kLmtbRvveUaW3a4QFkFd8hqhT8OKlbiI 5ttvCczzlgtVYFEH88nvImVQUOthPp9tqjicNL9Q18+0Mm5bp43mLArXrWXz+b2yYV+P4tDr8vl c5MOU1giB4oZ5fPmxAOMVBAOm/kPvRJAbRga+4OU7uIMkAF47BF3YHUvxQheVRM9pc4JcPWoveZ 50PfYM31XMS/U/n5d4ym+cO+aePnHY/N3ePObldPwnxzSKAslwnHE/hO9jiEKpLd/TUq2+Myznw 2YwI+5r1DZ8GPhzwAmJgGqYOi3I5mWIrDA4sWYowj1GZTFq/KF9li7sMVwTDTLsY9Xg1lpEtPBe C1HbJJKnmOvjduQ== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 Add the ability for a subsystem to add a user-friendly symlink that points to a ref_tracker_dir's debugfs file. Signed-off-by: Jeff Layton --- include/linux/ref_tracker.h | 13 +++++++++++++ lib/ref_tracker.c | 22 ++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/include/linux/ref_tracker.h b/include/linux/ref_tracker.h index dd289fdda12b1a10197912f5796f97002e785aaf..ddc5a7b2bd84692bbc1e1ae6767= 4ec2c6857e1ec 100644 --- a/include/linux/ref_tracker.h +++ b/include/linux/ref_tracker.h @@ -22,6 +22,7 @@ struct ref_tracker_dir { const char *class; /* object classname */ #ifdef CONFIG_DEBUG_FS struct dentry *dentry; + struct dentry *symlink; #endif char name[32]; #endif @@ -32,6 +33,7 @@ struct ref_tracker_dir { #ifdef CONFIG_DEBUG_FS =20 void ref_tracker_dir_debugfs(struct ref_tracker_dir *dir); +void ref_tracker_dir_symlink(struct ref_tracker_dir *dir, const char *fmt,= ...); =20 #else /* CONFIG_DEBUG_FS */ =20 @@ -39,6 +41,11 @@ static inline void ref_tracker_dir_debugfs(struct ref_tr= acker_dir *dir) { } =20 +static inline __ostream_printf +void ref_tracker_dir_symlink(struct ref_tracker_dir *dir, const char *fmt,= ...) +{ +} + #endif /* CONFIG_DEBUG_FS */ =20 static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir, @@ -56,6 +63,7 @@ static inline void ref_tracker_dir_init(struct ref_tracke= r_dir *dir, dir->class =3D class; #ifdef CONFIG_DEBUG_FS dir->dentry =3D NULL; + dir->symlink =3D NULL; #endif strscpy(dir->name, name, sizeof(dir->name)); ref_tracker_dir_debugfs(dir); @@ -91,6 +99,11 @@ static inline void ref_tracker_dir_debugfs(struct ref_tr= acker_dir *dir) { } =20 +static inline __ostream_printf +void ref_tracker_dir_symlink(struct ref_tracker_dir *dir, const char *fmt,= ...) +{ +} + static inline void ref_tracker_dir_exit(struct ref_tracker_dir *dir) { } diff --git a/lib/ref_tracker.c b/lib/ref_tracker.c index d4c1b1bae444debcb15ca20be39e35d25a7604d5..920538f1d3e9ee94acf141d1813= badea59e3cfc6 100644 --- a/lib/ref_tracker.c +++ b/lib/ref_tracker.c @@ -385,8 +385,30 @@ void ref_tracker_dir_debugfs(struct ref_tracker_dir *d= ir) } EXPORT_SYMBOL(ref_tracker_dir_debugfs); =20 +void __ostream_printf ref_tracker_dir_symlink(struct ref_tracker_dir *dir,= const char *fmt, ...) +{ + char name[NAME_MAX + 1]; + va_list args; + int ret; + + /* Already created, or dentry doesn't exist? Do nothing */ + if (!IS_ERR_OR_NULL(dir->symlink) || IS_ERR_OR_NULL(dir->dentry)) + return; + + va_start(args, fmt); + ret =3D vsnprintf(name, sizeof(name), fmt, args); + va_end(args); + name[sizeof(name) - 1] =3D '\0'; + + if (ret < sizeof(name)) + dir->symlink =3D debugfs_create_symlink(name, ref_tracker_debug_dir, + dir->dentry->d_name.name); +} +EXPORT_SYMBOL(ref_tracker_dir_symlink); + static void ref_tracker_debugfs_remove(struct ref_tracker_dir *dir) { + debugfs_remove(dir->symlink); debugfs_remove(dir->dentry); } =20 --=20 2.49.0