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 4F79F33B95C; Wed, 29 Oct 2025 12:20:58 +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=1761740458; cv=none; b=bd5BE8WdA1eHlV3fGFJxWELnMlWkoUZ4ZzAReoYH0Eiaw89Y6GpU4Hr98G7qL6wij4xkbzRS0TPKcl+eYUbrpmVlajoMTEY4Qa9viJeEi4S/SJu1/9a+jqQ7YDVCIFnnLtzgIg/Ul4IKunMbBjirbA0A1qgMem9fmYuZ7UykhA0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761740458; c=relaxed/simple; bh=LCe8V3QgmxQPWsHxmkO/HYNSTPj5l9bqGO1onywb9Xk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=euRChcNZDrZBxKeZG+v1guKA+zxyhPxIdmiY2rufA2g+q9wZb/JDIWcYMtaAoX8qgfcDOcmifZJxF7L5RM9GfdeZfj1y/kCQxKTpBYKB9afYHbwCX1qfZNByfsx8Z3UhXSmwkmUgBG9WImjliBoUQVrpWgWS0ZCr0ksZG349k9A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mMTPu2bN; 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="mMTPu2bN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 34849C4CEFD; Wed, 29 Oct 2025 12:20:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761740458; bh=LCe8V3QgmxQPWsHxmkO/HYNSTPj5l9bqGO1onywb9Xk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=mMTPu2bNqJYk3z9tG/iuJ4nYdSDV85gEZL1C6DNu8xzqRyyTznoiiELCZLXzpikh/ USruXCAOkEL9wkNrMlQm9nP5WhqDVH1IJQm7GKFLgVUM3mpH5vJxqAotW16jesKMR6 xQSFSj+Bilu+P3v2LD5bFf52qrDvbeK4U1bCvVdQV+mcH8GjECbCHqJ9b+LC2Xzc5a hsjYPOlu17x+jJXzkZeT1ojFk1Hgk0SOT4e9dOQ15or4/XVxvEhLl0V5IMtg820l8O UJCGgyvVr2gJp8DXecTQVageti/FrYwjh39sgXWamM25k/DxQTj/KzOTEt+cWH4k4q g4vQR5DNvMmGw== From: Christian Brauner Date: Wed, 29 Oct 2025 13:20:17 +0100 Subject: [PATCH v4 04/72] pidfs: raise DCACHE_DONTCACHE explicitly Precedence: bulk X-Mailing-List: linux-fsdevel@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: <20251029-work-namespace-nstree-listns-v4-4-2e6f823ebdc0@kernel.org> References: <20251029-work-namespace-nstree-listns-v4-0-2e6f823ebdc0@kernel.org> In-Reply-To: <20251029-work-namespace-nstree-listns-v4-0-2e6f823ebdc0@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=owGbwMvMwCU28Zj0gdSKO4sYT6slMWQysfU8WDTDV2jGlxfhfadWtV47U1Eb1s4VEu9kUfBAu vOo3cZdHaUsDGJcDLJiiiwO7Sbhcst5KjYbZWrAzGFlAhnCwMUpABM5qMfw3/lKJUvgyUfdkvM1 1sw4FyB1dEFh2ATte54V4cVGn/kdFBgZ5jxfN/+hyJovLozqNt86I0XPbp2gffbv8lTlBUzaE/6 aMAIA 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