From nobody Tue Feb 10 20:06:01 2026 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E7E4C24503B for ; Tue, 10 Feb 2026 00:38:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770683911; cv=none; b=FwkcCNaYAVdVU/+TyTlfBT25KPMQsfAx+kN6B7ond0epkDHHEVNNRB03VD8Pkkdc6mVK+oH7hlPfe+uS1jZhlvGqwwxVZJU4iRfULabv8zFAZmMLZE+LVS8d3KnhEhZtB46rYZ0wlD1BqpBPSom2luvOai0overCvTEIZe9qOG8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770683911; c=relaxed/simple; bh=xUZ6aO6Vonw0GmRwLJmSzeGDgxD5B5jYUwBGyhliZYQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=m2mXDh4rOPEy2l4CNFB4pJJTsD2GVwn1Q7dKxvXMWcqOkET6NNX24C3KzK6d629OaQXapJTL+A2qswiaXQ1RJLLfY+7MEySJjtGZX7v4AfdpvGCD3FuG0zXswCZP95NXf0uzqzhNdoMs+AbwuPwfZg0e2X3+CLRnxDV/Hq2miFQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--tjmercier.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=RWcy9Fsr; arc=none smtp.client-ip=209.85.210.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--tjmercier.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="RWcy9Fsr" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-82438027416so151800b3a.1 for ; Mon, 09 Feb 2026 16:38:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1770683909; x=1771288709; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=tip76l+g47OdHjbnqUq9WcMpsS2PZvPoe5KfSjLBVzA=; b=RWcy9FsrN2bax19CnztshhDysUsqmrhqmi0k6shl208zzWKSDywAMQERfNmyU7nleo XpZ3ldY0rK4GxtXzmZQis9Qn5wWQFTdoc4r04IPIqGXEmJzDwJQFSVlQAa3wet3DKJ5N jO+iwQNPIB0+SaSmOqfck9sk5dsk8wlGAUO5Bpif2synIclkS/ytxycKK+L9/bsKDbgT OjisM9QdKqa4Rp81cEDmX3c4Auhsq0yFCZw6V24lzngK3ZJXT9Dwjy4NDvRupvDB3mrP gvxhhf7ntwn+8OCdRbOJFntwPTTN20AEL69bAGhpgGPrN4NJyZFeBxyguiQszaQjU2T/ C7Uw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770683909; x=1771288709; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=tip76l+g47OdHjbnqUq9WcMpsS2PZvPoe5KfSjLBVzA=; b=VP+55b42yely65X+AMzAtS76/g3jM8YvLsB/w0rhwcS4S1Hux5D3UyIG1pOZmwzzx/ XCYu3T5HyNg5SRGGwjd/YSb3Y8pPby/LTd3z8dL45/hU7GuN3QhzRJmB+QIK0eRgYojS k6Oubl72igFuRJJY8Ni3iraDb8ISs/Z+RHp7GgUVhFro5O6COpde3M3X0iCZ+7zcGicq /+he3e3C1w43liuo7qjFYnVAZKRR6aKuZj5E7Me/eZ+7WgEzi9NrItd0HDzxwpeBWoqQ BbEilft93csvXy7/hKlk5PfxmqAmE6p5LQgRWvFucaHwgz519nFqPOgheEOapuOiEDkR rayw== X-Forwarded-Encrypted: i=1; AJvYcCUneNjGlMam4W8EYRlKiDKgtB8UNVcLPIXwEaDCfoEl8fkhjogFL7hPSMNZ4DBAr4K1j5jlB74kStmh9+M=@vger.kernel.org X-Gm-Message-State: AOJu0YzG0BUQfedcc1Kywm9hpVASPm0nn1afZy4FonBRiDfz9qy5X/KP isBLJbC1DpoWONL7nHQnGs3DGBWdKQ2hj41ckhQC1Cq2C4FX78I9p2wbKx5ex3C6epaWIFDJpNy kSVHh+RrTDSgFJbXQsw== X-Received: from pfbls21.prod.google.com ([2002:a05:6a00:7415:b0:822:4e8c:2c9e]) (user=tjmercier job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:3914:b0:823:9e5:855e with SMTP id d2e1a72fcca58-824413c8e09mr12457964b3a.0.1770683909153; Mon, 09 Feb 2026 16:38:29 -0800 (PST) Date: Mon, 9 Feb 2026 16:37:59 -0800 In-Reply-To: <20260210003801.2834976-1-tjmercier@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260210003801.2834976-1-tjmercier@google.com> X-Mailer: git-send-email 2.53.0.rc2.204.g2597b5adb4-goog Message-ID: <20260210003801.2834976-2-tjmercier@google.com> Subject: [PATCH 1/3] kernfs: allow passing fsnotify event types From: "T.J. Mercier" To: gregkh@linuxfoundation.org, tj@kernel.org, driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, shuah@kernel.org, linux-kselftest@vger.kernel.org Cc: "T.J. Mercier" Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The kernfs_notify function is hardcoded to only issue FS_MODIFY events since that is the only current use case. Allow for supporting other events by adding a notify_event field to kernfs_elem_attr. The limitation of only one queued event per kernfs_node continues to exist as a consequence of the design of the kernfs_notify_list. The new notify_event field is protected by the same kernfs_notify_lock as the existing notify_next field. Signed-off-by: T.J. Mercier --- fs/kernfs/file.c | 8 ++++++-- include/linux/kernfs.h | 1 + 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c index 9adf36e6364b..e978284ff983 100644 --- a/fs/kernfs/file.c +++ b/fs/kernfs/file.c @@ -914,6 +914,7 @@ static void kernfs_notify_workfn(struct work_struct *wo= rk) struct kernfs_node *kn; struct kernfs_super_info *info; struct kernfs_root *root; + u32 notify_event; repeat: /* pop one off the notify_list */ spin_lock_irq(&kernfs_notify_lock); @@ -924,6 +925,8 @@ static void kernfs_notify_workfn(struct work_struct *wo= rk) } kernfs_notify_list =3D kn->attr.notify_next; kn->attr.notify_next =3D NULL; + notify_event =3D kn->attr.notify_event; + kn->attr.notify_event =3D 0; spin_unlock_irq(&kernfs_notify_lock); =20 root =3D kernfs_root(kn); @@ -954,7 +957,7 @@ static void kernfs_notify_workfn(struct work_struct *wo= rk) if (parent) { p_inode =3D ilookup(info->sb, kernfs_ino(parent)); if (p_inode) { - fsnotify(FS_MODIFY | FS_EVENT_ON_CHILD, + fsnotify(notify_event | FS_EVENT_ON_CHILD, inode, FSNOTIFY_EVENT_INODE, p_inode, &name, inode, 0); iput(p_inode); @@ -964,7 +967,7 @@ static void kernfs_notify_workfn(struct work_struct *wo= rk) } =20 if (!p_inode) - fsnotify_inode(inode, FS_MODIFY); + fsnotify_inode(inode, notify_event); =20 iput(inode); } @@ -1005,6 +1008,7 @@ void kernfs_notify(struct kernfs_node *kn) if (!kn->attr.notify_next) { kernfs_get(kn); kn->attr.notify_next =3D kernfs_notify_list; + kn->attr.notify_event =3D FS_MODIFY; kernfs_notify_list =3D kn; schedule_work(&kernfs_notify_work); } diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h index b5a5f32fdfd1..1762b32c1a8e 100644 --- a/include/linux/kernfs.h +++ b/include/linux/kernfs.h @@ -181,6 +181,7 @@ struct kernfs_elem_attr { struct kernfs_open_node __rcu *open; loff_t size; struct kernfs_node *notify_next; /* for kernfs_notify() */ + u32 notify_event; /* for kernfs_notify() */ }; =20 /* --=20 2.53.0.rc2.204.g2597b5adb4-goog