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[1.160.233.238]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-361410bafa9sm7114296a91.15.2026.04.19.03.01.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 19 Apr 2026 03:01:35 -0700 (PDT) From: Sean Chang To: Benjamin Coddington Cc: Jeff Layton , trondmy@kernel.org, anna@kernel.org, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, Sean Chang Subject: [PATCH v2 1/2] NFS: remove redundant __private attribute from nfs_page_class Date: Sun, 19 Apr 2026 18:01:27 +0800 Message-ID: <20260419100128.20546-2-seanwascoding@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260419100128.20546-1-seanwascoding@gmail.com> References: <20260419100128.20546-1-seanwascoding@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The nfs_page_class tracepoint uses a pointer for the 'req' field marked with the __private attribute. This causes Sparse to complain about dereferencing a private pointer within the trace ring buffer context, specifically during the TP_fast_assign() operation. This fixes a Sparse warning introduced in commit b6ef079fd984 ("nfs: more in-depth tracing of writepage events") by removing the redundant __private attribute from the 'req' field. Signed-off-by: Sean Chang Reviewed-by: Benjamin Coddington --- fs/nfs/nfstrace.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h index 9f9ce4a565ea..ff467959f733 100644 --- a/fs/nfs/nfstrace.h +++ b/fs/nfs/nfstrace.h @@ -1496,7 +1496,7 @@ DECLARE_EVENT_CLASS(nfs_page_class, __field(dev_t, dev) __field(u32, fhandle) __field(u64, fileid) - __field(const struct nfs_page *__private, req) + __field(const struct nfs_page *, req) __field(loff_t, offset) __field(unsigned int, count) __field(unsigned long, flags) --=20 2.43.0 From nobody Tue Jun 16 11:17:50 2026 Received: from mail-pj1-f43.google.com (mail-pj1-f43.google.com [209.85.216.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0103F33A9D6 for ; Sun, 19 Apr 2026 10:01:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.43 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776592899; cv=none; b=nDWqwCqtCsUqDMMDPlL0bZfvmGxu9JZTa63e8mhuNB/yOHjx1opN2ZVefPTPFMw5Xx8SPkkhFs6Su2KzKGeMDjKdb25KLWRLGAwmw9+T4yngdsfR3lKDzYTclg6XEKrmtT7KZkYuNNpvQ/HoSiaMLHFCcDzlavsRXsfmeUvNNts= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776592899; c=relaxed/simple; bh=z7JTUZp4LcU47Ad0vEqEDrnBx2l3Hyr1Uu4aEgLGfWI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HwOiKEopJhOvDaf1XsjQtk1aYOwXqzCtp4jBBatr4VVIYIdBHENlm43zRvyPJEIzzQnSs3vjMGn565vYeoGmLENxb5XGUcPAd/0ATYstjI3AtW26hMlebx+EEbVn9fJ64vL4YoSTm0tXwvg/8jtsEVPt7PvrKOkW9SFRi1h+u/k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=BCcE7EhC; arc=none smtp.client-ip=209.85.216.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="BCcE7EhC" Received: by mail-pj1-f43.google.com with SMTP id 98e67ed59e1d1-35fb0bb27e7so1343833a91.1 for ; Sun, 19 Apr 2026 03:01:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1776592897; x=1777197697; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=HnrtODt+brqKChju/hWvOZFsJWLerfJ2s7y5kIXWfqk=; b=BCcE7EhCoD5f43Wxx0YTPhfy5vTfJBmitUA1eo8z4f+stdbEaHryMUTzqSlOkGm9O2 /sfPFmlLGW8DO/buJhnIODRzkhFyS/iyAWrRfGfk2IDxfoxKznpESrlv1mUpfa+U1Hv1 tdL7BfXDcD2rhXRKpluBIRdLeo6AkerohsB8N7Sv4stqXVIvRZVrkqbPSTeOc8jMX2Bg omBma5Wv39KyRVfFeOxnvpR3Rw/kZKSUNeMfkNh5dCcbEqvZpTmwn6ue/vo7CNmurEs/ 0XIgEuZA2MmCOgiOYw294Occ+CmSMRSd6651VtaIZs3C/UWSVS/iQ10JOmXJP09UvP/7 kp7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776592897; x=1777197697; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=HnrtODt+brqKChju/hWvOZFsJWLerfJ2s7y5kIXWfqk=; b=i4Lg0aDG1RaV8ZQrnaRhazTkMWZYoYJqBxQ0LfGr7I/jjz9CioeDlFyZTZF86NS7fz czrRfcyD6twVoRYRm6lWUmAWGL6JBDipZCGu1lHZJh8w+UeTq0TRx7FhguRD8SvqAg/+ spIbH5XQI1qttamWLj62Vg66ulOn5JYz6sFfxcg86jExiYOhSPSZAE7i1ialeO71fEaw UjJa5GAZ1dM2OGTCauhEISqf97i9thyIltkJOjkWDCZhoCmLLx5qQIxjcu0G/jKrmaT8 r/YqyKMbtTRttrJLV1iugw+D2Dgdln9j0x9HLC4JWSQmY5BSlQgoUE0AYBU0b7Xx1oug Pziw== X-Forwarded-Encrypted: i=1; AFNElJ9Nrf6gHLGPh9xPMN3Pxtnl8/bZKCkQ4hu2DQ/MZQwDiGS57BzaUYdaf7X0T8pfQa0dxM1x5CHRbAUtKwQ=@vger.kernel.org X-Gm-Message-State: AOJu0YwE52Yy1DpSYhYkikc3Rdbtiee3wwhu7c+h2whgFNSmtRLJfWS+ dy1L2KO2YXlI2PjlgNrof3LuizHUnarzlGNLWHsFsp/UkoL7Wh76rBvn X-Gm-Gg: AeBDiev0OzoL2e05E7kuHm54+P9YhGPI3VNS67NXOL2DBy+lF3zPWu5LyA2w6f5F3oB wvxBJYl1JmU5a53u14ZRLe60O+OLAsv6FugyZ5ySs3uJnjxWQ+3sQ5B7o4E57uRVnvvE1ZttmHj I170dROBm33lWs6CTRNJRg3CQIchnIcz8yjqexIvr7HXyfKV0fPff0KuyzX0fopiEIXy0pXiAkZ /AUVs7lhavszosRd6/aNNpdVjo2+o+bk7DX49WTxw6AFUPuSLpuhkhiK7m6eDhKH1UynNFSy4Np idcQIlc+iLTXH3YjfbF8Wdg44ueH+dBKOlif6FGdaatlG+Pif8tBQqhe4Qx+Z4SDgBzsUw21+UH 52hB+C8ddqqAdc7EWpgEae8nDgV+Bkdo43eNU7iu8pHGXkPT9ZXY0641cesCqqxvEh3d/UVHF10 Tu6wobFpvT+G4thVmfLPPq8jT0PF1hgYZqvh1eOjNefMMsIVhX8RxeBGhGDUKtdypqwOJsOnofb cz2adW6k4+G8wuy/ANqmg6xbgVZI1Jq7hLM+fhB X-Received: by 2002:a17:90b:53c3:b0:35d:a38a:a117 with SMTP id 98e67ed59e1d1-361404745f7mr10149942a91.15.1776592897328; Sun, 19 Apr 2026 03:01:37 -0700 (PDT) Received: from localhost.localdomain (1-160-233-238.dynamic-ip.hinet.net. [1.160.233.238]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-361410bafa9sm7114296a91.15.2026.04.19.03.01.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 19 Apr 2026 03:01:37 -0700 (PDT) From: Sean Chang To: Benjamin Coddington Cc: Jeff Layton , trondmy@kernel.org, anna@kernel.org, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, Sean Chang Subject: [PATCH v2 2/2] NFS: Fix RCU dereference of cl_xprt in nfs_compare_super_address Date: Sun, 19 Apr 2026 18:01:28 +0800 Message-ID: <20260419100128.20546-3-seanwascoding@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260419100128.20546-1-seanwascoding@gmail.com> References: <20260419100128.20546-1-seanwascoding@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The cl_xprt pointer in struct rpc_clnt is marked as __rcu. Accessing it directly in nfs_compare_super_address() is unsafe and triggers Sparse warnings. Fix this by wrapping the access with rcu_read_lock() and using rcu_dereference() to safely retrieve the transport pointer. This ensures the xprt structure remains memory-safe during the comparison of network namespaces and addresses. Additionally, add a check for the XPRT_CONNECTED state bit. While RCU guarantees the memory remains valid, checking XPRT_CONNECTED ensures the transport is still logically active, preventing operations on a transport that is already undergoing teardown. Fixes: 7e3fcf61abde ("nfs: don't share mounts between network namespaces") Signed-off-by: Sean Chang --- fs/nfs/super.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 7a318581f85b..c9044d9d64cc 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -1166,12 +1166,23 @@ static int nfs_set_super(struct super_block *s, str= uct fs_context *fc) static int nfs_compare_super_address(struct nfs_server *server1, struct nfs_server *server2) { + struct rpc_xprt *xprt1, *xprt2; struct sockaddr *sap1, *sap2; - struct rpc_xprt *xprt1 =3D server1->client->cl_xprt; - struct rpc_xprt *xprt2 =3D server2->client->cl_xprt; + + rcu_read_lock(); + + xprt1 =3D rcu_dereference(server1->client->cl_xprt); + xprt2 =3D rcu_dereference(server2->client->cl_xprt); + + if (!xprt1 || !xprt2 || + !test_bit(XPRT_CONNECTED, &xprt1->state) || + !test_bit(XPRT_CONNECTED, &xprt2->state)) + goto out_unlock; =20 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) - return 0; + goto out_unlock; + + rcu_read_unlock(); =20 sap1 =3D (struct sockaddr *)&server1->nfs_client->cl_addr; sap2 =3D (struct sockaddr *)&server2->nfs_client->cl_addr; @@ -1203,6 +1214,10 @@ static int nfs_compare_super_address(struct nfs_serv= er *server1, } =20 return 1; + +out_unlock: + rcu_read_unlock(); + return 0; } =20 static int nfs_compare_userns(const struct nfs_server *old, --=20 2.43.0