The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x 6165a16a5ad9b237bb3131cff4d3c601ccb8f9a3 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023040340-bouncing-sampling-7639@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

6165a16a5ad9 ("NFSv4: Fix hangs when recovering open state after a server reboot") e3c8dc761ead ("NFSv4: Check the return value of update_open_stateid()") ace9fad43aa6 ("NFSv4: Convert struct nfs4_state to use refcount_t")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 6165a16a5ad9b237bb3131cff4d3c601ccb8f9a3 Mon Sep 17 00:00:00 2001 From: Trond Myklebust trond.myklebust@hammerspace.com Date: Tue, 21 Mar 2023 00:17:36 -0400 Subject: [PATCH] NFSv4: Fix hangs when recovering open state after a server reboot

When we're using a cached open stateid or a delegation in order to avoid sending a CLAIM_PREVIOUS open RPC call to the server, we don't have a new open stateid to present to update_open_stateid(). Instead rely on nfs4_try_open_cached(), just as if we were doing a normal open.

Fixes: d2bfda2e7aa0 ("NFSv4: don't reprocess cached open CLAIM_PREVIOUS") Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust trond.myklebust@hammerspace.com Signed-off-by: Anna Schumaker Anna.Schumaker@Netapp.com

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 22a93ae46cd7..5607b1e2b821 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -1980,8 +1980,7 @@ _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) if (!data->rpc_done) { if (data->rpc_status) return ERR_PTR(data->rpc_status); - /* cached opens have already been processed */ - goto update; + return nfs4_try_open_cached(data); }

ret = nfs_refresh_inode(inode, &data->f_attr); @@ -1990,7 +1989,7 @@ _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)

if (data->o_res.delegation_type != 0) nfs4_opendata_check_deleg(data, state); -update: + if (!update_open_stateid(state, &data->o_res.stateid, NULL, data->o_arg.fmode)) return ERR_PTR(-EAGAIN);