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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=RsXLh3XH; 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 E86D3606AC3D; Wed, 4 Nov 2026 19:51:20 +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=RsXLh3XH Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6873B1F000C1; Wed, 4 Nov 2026 19:51:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793821880; bh=LP8R0bNSKS2QH/Zql1k1p4KE760gSx77oAIYdTk5FHQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=RsXLh3XHwh9i9KYLzGYCXUR/3jz6hvJBiKTUXoJMpIyHBIQckhaIML2AcsaatHJA1 0eBgijXzBWphawzWAAAliBSKwy94Zq0H8fcdbx7zd77a8zoJ0Ue7FRHLvIZ7LfaCRL NWsF0xR2vHzqH47EGJ+b1zhQAPz56CBGLrP9V51eK/aUOfQX+ePGLsZp0VZGcq3umB NDozx0Pud3lqomDaEsA6NBp0dWh/oMo1BEzvyC9LXCvrcoisYiWT1saIA5w7Ryz3SA YyQib6eqTR5sEMMLmZee9CeR7k9yWAYrkLQ/ZLwHgmz6BrgXZZ6ltNiDOnrSr0ulvD XM4slagBXfM8w== From: Christian Brauner 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 Subject: [PATCH RESEND v2 06/30] nfsd: let procfs own the seq_file of /proc/fs/nfs/exports Date: Wed, 4 Nov 2026 20:51:06 +0100 Message-ID: <20261104-work-procfs-fs-v2-6-319e0f9a8aae@kernel.org> In-Reply-To: <20261104-work-procfs-fs-v2-0-319e0f9a8aae@kernel.org> References: <20261104-work-procfs-fs-v2-0-319e0f9a8aae@kernel.org> 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" X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1388; i=brauner@kernel.org; h=from:subject:message-id; bh=zWLMsIr05BMF/tXliLgjdHfvlEWh2osbn3SGLQ8SJYE=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS97jGs4JaPtH3mH5ykZTabedr3t9eLXxuUWtVOVPA6f zVLaV15RykLgxgXg6yYIotDu0m43HKeis1GmRowc1iZQIYwcHEKwEQOxTEy7LkV8VeozHTu0b5W PgXDRpfpiWc3tHXbzdur9fTJDgPvGob/HiLTPjd/X3HGOa2I9VGcSnVnmAirzPkpT6wvTMpmfzi TEwA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Content-Transfer-Encoding: 8bit Declare the seq_operations and let procfs open and free the seq_file. ->proc_open() and ->proc_release() only set up ->private and take and drop the reference to the network namespace now. Reading the file then no longer holds up its removal. Acked-by: Chuck Lever Signed-off-by: Christian Brauner (Amutable) --- fs/nfsd/nfsctl.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index f8ce3c0fb077..5b2782f9dbbd 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -1407,16 +1407,23 @@ MODULE_ALIAS_FS("nfsd"); #ifdef CONFIG_PROC_FS +/* procfs opens the seq_file */ static int exports_proc_open(struct inode *inode, struct file *file) { - return exports_net_open(current->nsproxy->net_ns, file); + exports_net_init(current->nsproxy->net_ns, file->private_data); + return 0; +} + +static int exports_proc_release(struct inode *inode, struct file *file) +{ + exports_net_put(file->private_data); + return 0; } static const struct proc_ops exports_proc_ops = { + .proc_seq_ops = &nfs_exports_op, .proc_open = exports_proc_open, - .proc_read = seq_read, - .proc_lseek = seq_lseek, - .proc_release = exports_release, + .proc_release = exports_proc_release, }; static int create_proc_exports_entry(void) -- 2.53.0