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([2607:fea8:d681:2400:e8ee:54ba:50d9:dea6]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8d4b24ea458sm299111085a.9.2026.04.04.07.28.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 04 Apr 2026 07:28:37 -0700 (PDT) From: Tushar Sariya To: Trond Myklebust , Anna Schumaker Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, carnil@debian.org, maik.nergert@uni-hamburg.de, valentin.samir@magellium.fr, regressions@lists.linux.dev, Tushar Sariya Subject: [PATCH v2 0/1] NFSv4.1: Apply session size limits on clone path Date: Sat, 4 Apr 2026 11:58:02 -0230 Message-ID: <20260404142831.3341498-1-tushar.sariya77@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <177349021750.3039212.10211295677877269201@eldamar.lan> References: <177349021750.3039212.10211295677877269201@eldamar.lan> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Tushar Sariya The NFS automount clone path (nfs4_clone_server) is missing the session-size clamping that top-level mounts get in nfs4_server_common_setup(). This was exposed by 2b092175f5e3 which changed submounts to no longer unconditionally inherit the parent's already-clamped rsize/wsize. On servers that enforce tight max_request_size budgets (reported on Dell EMC Isilon/OneFS), the child mount ends up with raw unclamped values that exceed the session channel limits, resulting in NFS4ERR_REQ_TOO_BIG and user-visible EIO. Note: I was unable to reproduce the exact failure locally as it appears to require a server that enforces tight max_request_size budgets. The fix is based on code analysis — the clone path is missing the same session-limit clamping that top-level mounts apply in nfs4_server_common_setup(). Tested that the kernel builds and boots successfully. Tushar Sariya (1): NFSv4.1: Apply session size limits on clone path fs/nfs/internal.h | 2 ++ fs/nfs/nfs4client.c | 4 ++-- fs/nfs/nfs4proc.c | 3 +++ 3 files changed, 7 insertions(+), 2 deletions(-) -- 2.43.0