From nobody Sun Feb 8 22:06:31 2026 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 6EBD7298CDB; Mon, 28 Apr 2025 18:27:12 +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=1745864832; cv=none; b=ibLO9V2XZzEqTmO5IVqvKSos86wi9ItY7Qwi3P+2Q3Q1tKmGl760AcOmYmb6BbCdJgKbFIkROg3ZuzYJES5DI8vTaloOEOCKrWK/d2gpugGyTCnf96gPwyDJaUCeZJ92EOymx3Z0TpFUtywvT27uxPKTZ3oeuNROQxKjAkPsPs0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745864832; c=relaxed/simple; bh=i0sKkNPaB0sY+YCWICK9OSFrGSBCfe0apiknij8kW04=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=JVYZnHZox/d+Kw8iHSG1zz1AcY4rRaAzqlllz1rl5w7ssS90zhPmnEqA4PSEW+P3IuBXzOwpm5+XjM+ziwVtrPhfe7Jh96q8VX3f/nxPSMaGdxZPq5fh7AaIg0bkVqr12ocTuvhRl0UCo/9ghSCT8veH+TwLBc1YeAJim6CsaYU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hoKEP/4K; 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="hoKEP/4K" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36174C4CEF2; Mon, 28 Apr 2025 18:27:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745864831; bh=i0sKkNPaB0sY+YCWICK9OSFrGSBCfe0apiknij8kW04=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=hoKEP/4Kkao1Nmd7KgvmqFCRwZquS4LU+DlwxXpqciMNa6rXs5rdQ3aNHVwqeAES0 yEiDgUKSqucnDwbJekI6GPBLdB1l063zpo9segVy8zHTt0KdB5mI60Z8G9c/CSMfYE tC1++zpjlUbfjc6zrVAQ7HSBxS8lXJESYTzHQiTcM3ntOQnhJy66HS4xSOh407JM97 wEWO6FSRwGZv9Ax+9nSABPXZkXis1RrqaYfYZ7RCIqwo7AeGNOeNmDSTzc6FKYgqzs /vW+vSLRhYaQsi0OCavsyBuyy6TXscBwF8s4btbLfq+ekeEtq6KUIBO8Y4R31pfiV7 VqtX+LVxMtIVg== From: Jeff Layton Date: Mon, 28 Apr 2025 11:26:30 -0700 Subject: [PATCH v5 07/10] 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: <20250428-reftrack-dbgfs-v5-7-1cbbdf2038bd@kernel.org> References: <20250428-reftrack-dbgfs-v5-0-1cbbdf2038bd@kernel.org> In-Reply-To: <20250428-reftrack-dbgfs-v5-0-1cbbdf2038bd@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: 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=2954; i=jlayton@kernel.org; h=from:subject:message-id; bh=i0sKkNPaB0sY+YCWICK9OSFrGSBCfe0apiknij8kW04=; b=owEBbQKS/ZANAwAIAQAOaEEZVoIVAcsmYgBoD8h2mnfftV3/eT0IIGckwJAUE6JefHdUn76tY BT0pXPJ6fCJAjMEAAEIAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCaA/IdgAKCRAADmhBGVaC FWu/D/9Y0/TN64vxBj4sSN5GZ36a9aqZ/hBAB+vKh/1b0QTT1tUlKbxfdUosPfz+8H63LEKipjg dRmTegRPq+Fq9pRLgJCLni8Wx21MhwmTrPFHNz81zcsGuLS1jcNUODSwPJTvT8gaK/LiZurmn/5 hh7Wl+k3Fye4G78UI0eBMB+g8Hgu5ATr8WHhz2n4yu4R1kyI+KVGc+FcS2khgEvwqDhLwFTb6ky 1CyNWa9ikWs8f87Ytejv+m0TJ8pSh38AYMtKYxXHQUzCnsdOvz/oKJRfQOum/To6m7AqaLQnVuG RuMIxFnBEQwU/Ua1nS0AGbOrE0gHhI/nPPEsxiYwySvbPDRujt7G9Cf4Mwjm1QT1kg/jqarqqBg hEZzu/Jh4Ga9Fo9x0wohELe7WEObYqZA5ANyn+/OIHLNd2thlA9x5xk7xtzxCRQnhfoCOjEJHTl QsHsAdAoQUVlI5aOfcSmbwfQGfmGWomclny0DNPdRyP7BYElF1545tNO2emrKke7U6mMydtj85e pf0TYtZBe61ZvCz/8BfwCGUPvVTV4KfXgHeA1ykU4lIdfDGVljXUXbknkJWHJDQPdf75KQpAkfi m3xeOWb9ikiX+NDU1tsUX1tLrWpDw2ul99o3gTJExNbWnX03x0G53KY9hf7IHk7GnQKb/Vs0oKb YDMJM2whpsvjKMg== 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 | 7 +++++++ lib/ref_tracker.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/include/linux/ref_tracker.h b/include/linux/ref_tracker.h index c6e65d7ef4d4fc74c60fcabd19166c131d4173e2..a011297c501011c697de44469f9= 720597aa33116 100644 --- a/include/linux/ref_tracker.h +++ b/include/linux/ref_tracker.h @@ -21,6 +21,7 @@ struct ref_tracker_dir { const char *class; /* object classname */ #ifdef CONFIG_DEBUG_FS struct dentry *dentry; + struct dentry *symlink; #endif char name[32]; #endif @@ -29,6 +30,7 @@ struct ref_tracker_dir { #ifdef CONFIG_REF_TRACKER =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 static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir, unsigned int quarantine_count, @@ -45,6 +47,7 @@ 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); @@ -80,6 +83,10 @@ static inline void ref_tracker_dir_debugfs(struct ref_tr= acker_dir *dir) { } =20 +static inline void ref_tracker_dir_symlink(struct ref_tracker_dir *dir, co= nst 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 f5424857b0fde2339cce31c6744fd4dafbaf0d2a..25fb22c0a367573851d83a8a00b= 99b109871f47d 100644 --- a/lib/ref_tracker.c +++ b/lib/ref_tracker.c @@ -394,8 +394,36 @@ 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); + else + dir->symlink =3D ERR_PTR(-ENAMETOOLONG); + + if (IS_ERR(dir->symlink)) + pr_warn("ref_tracker: unable to create debugfs symlink for %s: %pe\n", + name, dir->symlink); +} +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