From mboxrd@z Thu Jan 1 00:00:00 1970 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 E626F270545; Wed, 22 Oct 2025 16:06:26 +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=1761149187; cv=none; b=dKGPaym7vfyqGh32HwpJ8PfTLxaG6p891Zd3ALWf5aPgFsfHm0NtJYKCJvw701q4W5Xo+XYmCWvlV/656WeBnLXyIj4LJHtbn7/UuccXAGdezJ6yJ5/krFsi2GgkspfHgeT14S3ZPuPDI6AMIIM6Eh+VqvIkSXzXvJIFpjPSUpc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761149187; c=relaxed/simple; bh=LCe8V3QgmxQPWsHxmkO/HYNSTPj5l9bqGO1onywb9Xk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=HtiDXdGp7vYmoXyMYjByt89l4e+hSs1OsN731TZWco93EMnwDJ+HUBkOkr5dcOCB20itKNLAK+SOUlj473Fskry5mFQva6CACLVnVjKhPfDTOzDvDJY2eGjzxa6GxyMMc3+XmXBKi3f5oWiiAOrzeLCfeBLoq3S5t2ipCxQ0Ljk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=s8PIA0Vf; 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="s8PIA0Vf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A4AB2C4CEE7; Wed, 22 Oct 2025 16:06:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761149186; bh=LCe8V3QgmxQPWsHxmkO/HYNSTPj5l9bqGO1onywb9Xk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=s8PIA0VfE2ocot2tubS9anEfXvamyEbPyN402RWBQItpu7LgmxTAvhiyFhTu5UUlV j4eZKpkf5GFRPZbzuR7ckT0ayuqwhge31dZRmzTIoHJneikhFhKUDKpoKKjfvF5tcq at5Gqq5YhALw5/YswpMQ+bNStLftu7wsuS8HP/LaUaStyKaHaGBJ0HWvQ0vI8yme48 YFgqDRG+Wjqn3sdoPPghsyOMgs5eNPeWfdtK2ePq6JMLCsq2IrPvGbCwj3f/avURaT KX/HwY6P3xolMpxIeRMd8nokUNvHczoa3TRu//JFrzLmzf99Ody3+TVIhI8+ZQCkyv 1qe41AbBRRnrg== From: Christian Brauner Date: Wed, 22 Oct 2025 18:05:42 +0200 Subject: [PATCH v2 04/63] pidfs: raise DCACHE_DONTCACHE explicitly Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251022-work-namespace-nstree-listns-v2-4-71a588572371@kernel.org> References: <20251022-work-namespace-nstree-listns-v2-0-71a588572371@kernel.org> In-Reply-To: <20251022-work-namespace-nstree-listns-v2-0-71a588572371@kernel.org> To: linux-fsdevel@vger.kernel.org, Josef Bacik , Jeff Layton Cc: Jann Horn , Mike Yuan , =?utf-8?q?Zbigniew_J=C4=99drzejewski-Szmek?= , Lennart Poettering , Daan De Meyer , Aleksa Sarai , Amir Goldstein , Tejun Heo , Johannes Weiner , Thomas Gleixner , Alexander Viro , Jan Kara , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, Eric Dumazet , Jakub Kicinski , netdev@vger.kernel.org, Arnd Bergmann , Christian Brauner X-Mailer: b4 0.15-dev-96507 X-Developer-Signature: v=1; a=openpgp-sha256; l=824; i=brauner@kernel.org; h=from:subject:message-id; bh=LCe8V3QgmxQPWsHxmkO/HYNSTPj5l9bqGO1onywb9Xk=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWT8ZHhifVJGWW9Lvo3Ewoiz13xPS9uLTihRbTIz1cwNt vwb9GxSRykLgxgXg6yYIotDu0m43HKeis1GmRowc1iZQIYwcHEKwERM/zEy3Fq0f6bJnP3Tnky8 VbZKwcZ35qpTnvLOUS2vEnebrQh73MHwT2FCUucTqWVr3zJrGft0Cu8o9t+9ytTurE+X4HetA3t l+AA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 While pidfs dentries are never hashed and thus retain_dentry() will never consider them for placing them on the LRU it isn't great to always have to go and remember that. Raise DCACHE_DONTCACHE explicitly as a visual marker that dentries aren't kept but freed immediately instead. Signed-off-by: Christian Brauner --- fs/pidfs.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/pidfs.c b/fs/pidfs.c index 0ef5b47d796a..db236427fc2c 100644 --- a/fs/pidfs.c +++ b/fs/pidfs.c @@ -1022,6 +1022,7 @@ static int pidfs_init_fs_context(struct fs_context *fc) fc->s_iflags |= SB_I_NOEXEC; fc->s_iflags |= SB_I_NODEV; + ctx->s_d_flags |= DCACHE_DONTCACHE; ctx->ops = &pidfs_sops; ctx->eops = &pidfs_export_operations; ctx->dops = &pidfs_dentry_operations; -- 2.47.3