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 DC83932E692; Tue, 21 Oct 2025 11:44:04 +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=1761047045; cv=none; b=r8Xd/DkTHtOVa8nLRePv08L4Z/5dDdXo2/W0RopPcD23D7XVtMr9B8UUX4TgBIXvDoGDw4QfOuYeePNysys1z6Qlf03V6ia1uhRiwxzYf4TXlMrF2dBVqnI8VwAPRaEFZM5GvRpx65aWIEsITGgmCz855PBvFI2Uo1JDBTSFoc0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761047045; c=relaxed/simple; bh=VMCLQ5Neu+JsCPfFhnjTC4pvJzkr6RMBoSrPUgoYfJM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=W6r2sTwJJxceonevxeoG53Uc8Ih2oUrvwpMNrYbYxPGS+l6DuJJHl0TAnF6EtYUytp0sJct6Iumy0mVLWkZE54fRPQDND6usdHcgAzTZ6wQub9l24iP0KSCQIBdc5w+QOA5dD5giuF+pXPrB8I58bEslHB7C/hYXYLpHlqEnkJ4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UQ1WDaKs; 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="UQ1WDaKs" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C55BC4CEF5; Tue, 21 Oct 2025 11:43:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761047044; bh=VMCLQ5Neu+JsCPfFhnjTC4pvJzkr6RMBoSrPUgoYfJM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=UQ1WDaKsPDEQbhZFxksWG3cs6XalP+MFAPtfhb1e27i+O56klnEYjmWmz8v+LNfEK lb1u3ORIzea+YbyE2BjPo3Ri8gQc3PlDFVMRfOnrT3UJp1pB846Ww0xbmKuAygaKTh hAQ+4TF0TCuO7HwF3aTUQJyq1J9YMxQK1kCUJpPzj4WOb9IugcS7bjNvekaqoqNpWa tR89Rvp8R1P5HAP9EHqXKmZNnFA/LZNG2fdzqCy8uGIp0+8jYdkK6wgYY0x4Xm9Vfg adVUATW/qL0yqG1lSFuIOUYkXp0ZFxqCY7iG2FBpqyIyO2EkHvnGKJumFPywN0AtDD Yj43n/EdOgnug== From: Christian Brauner Date: Tue, 21 Oct 2025 13:43:09 +0200 Subject: [PATCH RFC DRAFT 03/50] nsfs: 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: <20251021-work-namespace-nstree-listns-v1-3-ad44261a8a5b@kernel.org> References: <20251021-work-namespace-nstree-listns-v1-0-ad44261a8a5b@kernel.org> In-Reply-To: <20251021-work-namespace-nstree-listns-v1-0-ad44261a8a5b@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=840; i=brauner@kernel.org; h=from:subject:message-id; bh=VMCLQ5Neu+JsCPfFhnjTC4pvJzkr6RMBoSrPUgoYfJM=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWR8L3yz8UNP+eY1LUL1iY67rCNVCw7o3c9QiCl3cGhsv Ju9c2t4RykLgxgXg6yYIotDu0m43HKeis1GmRowc1iZQIYwcHEKwET2lDAyrBLTWhs5/fCpWX7M a/nysnr+fSv/6vltg33EEtWkvx0icxj+aexvenF7bsxSP5MrDrGdrcEPeoTe1UgbSOpfXu966X8 lEwA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 While nsfs 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/nsfs.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/nsfs.c b/fs/nsfs.c index 4e77eba0c8fc..0e3fe8fda5bf 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -589,6 +589,7 @@ static int nsfs_init_fs_context(struct fs_context *fc) struct pseudo_fs_context *ctx = init_pseudo(fc, NSFS_MAGIC); if (!ctx) return -ENOMEM; + ctx->s_d_flags |= DCACHE_DONTCACHE; ctx->ops = &nsfs_ops; ctx->eops = &nsfs_export_operations; ctx->dops = &ns_dentry_operations; -- 2.47.3