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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=SkwsCH5N; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D6306093289; Mon, 2 Nov 2026 15:12:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=SkwsCH5N Received: by smtp.kernel.org (Postfix) with ESMTPSA id EA7A31F00A1A; Mon, 2 Nov 2026 15:11:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793632325; bh=ymYBzOXC+1qnPq3+H1dG+MOV1EJ0vnAFrYigKbllIFM=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=SkwsCH5NX6Vwuc8YrkplsbXUYGZlDfQ9CBIwHzcNKyVojyOkIh1miTD756wE+V94K qbWnPBCFoEsk5Vnl3IISVP4GtRJh7t/+O5UXryDxT4dLTsrhtBDQtWOzMD+XlPQhS1 5THCVq9/EcREtyMc1/N5VSwvG3Q1CrUodeGrQPLGHFNfVpmv58FNgX24+XU26JY7OW sUsvQbz2VbjL7MwP3kVNJQ4yIC+/SktiBLhGC+6TRx0O6yviVfRR7mxZOD/Hx4nWfU 5GaDkAcE0fW19SSj+Gk/9Y8llQ2bd+zIEgssZ8CrEgkZbej1DhvNKvROVGhxK2nbP0 DIw+cl37jf3tQ== From: Christian Brauner Date: Mon, 02 Nov 2026 16:07:13 +0100 Subject: [PATCH RFC 06/23] md: let procfs own the seq_file of /proc/mdstat X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261102-work-procfs-drivers-v1-6-a994bd4d3b1a@kernel.org> References: <20261102-work-procfs-drivers-v1-0-a994bd4d3b1a@kernel.org> In-Reply-To: <20261102-work-procfs-drivers-v1-0-a994bd4d3b1a@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Jann Horn , Josef Bacik , Chris Mason , Jeff Layton , NeilBrown , Eric Dumazet , Thomas Gleixner , Al Viro , Jonathan Corbet , Christoph Hellwig , Greg Kroah-Hartman , Joel Granados , Kees Cook , Jan Kara , Jan Kara , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-um@lists.infradead.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, platform-driver-x86@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, netfilter-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, ibm-acpi-devel@lists.sourceforge.net, jfs-discussion@lists.sourceforge.net, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-doc@vger.kernel.org, linux-serial@vger.kernel.org, linux-atm-general@lists.sourceforge.net, Takashi Iwai , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, linux-debuggers@vger.kernel.org, "Christian Brauner (Amutable)" , Chuck Lever X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1303; i=brauner@kernel.org; h=from:subject:message-id; bh=98AwGD4IED7vI5/KgxxfmkGNQYsM7jyTpJ1BeJQdwqI=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9WG5wa9eb9mvKGcqFdjwLmF1n7FyoUu4/zTbeKoP9V 5jBq1ePOkpZGMS4GGTFFFkc2k3C5ZbzVGw2ytSAmcPKBDKEgYtTACbyaQLD//zX1pfyeqN/TEhI Ob3+1Rm/J2p79l/hyunq2m7Kda/Ix4uRoXfzjTPHbDmCeqqTG/in+s5mk9vmK2YguPrLjge1T+z 2swMA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Declare the seq_operations and let procfs open and free the seq_file. ->proc_open() only records the event count for ->proc_poll() now. Signed-off-by: Christian Brauner (Amutable) --- drivers/md/md.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 680b34a63cb3..e642b763ebc2 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -9141,18 +9141,13 @@ static const struct seq_operations md_seq_ops = { .show = md_seq_show, }; +/* procfs opens the seq_file */ static int md_seq_open(struct inode *inode, struct file *file) { - struct seq_file *seq; - int error; - - error = seq_open(file, &md_seq_ops); - if (error) - return error; + struct seq_file *seq = file->private_data; - seq = file->private_data; seq->poll_event = atomic_read(&md_event_count); - return error; + return 0; } static int md_unloading; @@ -9174,10 +9169,8 @@ static __poll_t mdstat_poll(struct file *filp, poll_table *wait) } static const struct proc_ops mdstat_proc_ops = { + .proc_seq_ops = &md_seq_ops, .proc_open = md_seq_open, - .proc_read = seq_read, - .proc_lseek = seq_lseek, - .proc_release = seq_release, .proc_poll = mdstat_poll, }; -- 2.53.0