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Fri, 18 Sep 2026 05:21:04 -0700 (PDT) Received: from bcodding.csb.hammerspace.com ([66.97.168.37]) by smtp.gmail.com with ESMTPSA id 5614622812f47-4cd6ab7d9d3sm883331b6e.18.2026.09.18.05.21.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Sep 2026 05:21:04 -0700 (PDT) From: Benjamin Coddington X-Google-Original-From: Benjamin Coddington To: Trond Myklebust , Anna Schumaker Cc: linux-nfs@vger.kernel.org, Mike Snitzer Subject: [PATCH 0/2] NFSv4/pnfs: Keep data server connections across deviceid eviction Date: Fri, 18 Sep 2026 08:21:00 -0400 Message-ID: X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This applies on top of the flexfiles striping series: [PATCH v4 00/24] NFS: flexfiles device notifications and caching for wide striped layouts https://lore.kernel.org/linux-nfs/cover.1789474702.git.bcodding@hammerspace.com and uses the hashed, address-keyed data server cache that series adds. A metadata server that does not support deviceid notifications makes the client set NFS_DEVICEID_NOCACHE, and a NOCACHE deviceid node is freed as soon as the last layout referring to it is returned. That takes the data server's nfs_client and every transport underneath it along with it: nfs4_put_deviceid_node() ff_layout_free_deviceid_node() nfs4_pnfs_ds_put() destroy_ds() nfs_put_client() rpc_shutdown_client() The next I/O rebuilds all of it: a synchronous connect and NULL ping inline in pg_init(), plus the remaining nconnect-1 transports reconnecting lazily as RPCs land on them. I have a report of a wide stripe at nconnect=16 spending upwards of ten seconds on this before I/O can proceed, and paying it again on every layout cycle. Keep the nfs4_pnfs_ds hashed once its last user goes away, and reap it later if nothing claims it. Benjamin Coddington (2): NFSv4/pnfs: Give the data server cache its own reference NFSv4/pnfs: Let unused data server connections linger fs/nfs/pnfs.c | 4 +- fs/nfs/pnfs.h | 4 ++ fs/nfs/pnfs_nfs.c | 110 +++++++++++++++++++++++++++++++++++++++++++--- 3 files changed, 112 insertions(+), 6 deletions(-) -- 2.53.0