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| author | Chuck Lever <chuck.lever@oracle.com> | 2025-01-14 17:09:24 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-10 14:39:40 +0200 |
| commit | c6f2a8146da1c30d947bbdddd5cd84566ed8ae5d (patch) | |
| tree | ba0e41bf4ce660fa37541a437313a875ac3ee581 | |
| parent | afec5b5010de3f8494e10fc904a9453003d9a0aa (diff) | |
| download | linux-c6f2a8146da1c30d947bbdddd5cd84566ed8ae5d.tar.gz linux-c6f2a8146da1c30d947bbdddd5cd84566ed8ae5d.tar.bz2 linux-c6f2a8146da1c30d947bbdddd5cd84566ed8ae5d.zip | |
NFSD: Skip sending CB_RECALL_ANY when the backchannel isn't up
commit 8a388c1fabeb6606e16467b23242416c0dbeffad upstream.
NFSD sends CB_RECALL_ANY to clients when the server is low on
memory or that client has a large number of delegations outstanding.
We've seen cases where NFSD attempts to send CB_RECALL_ANY requests
to disconnected clients, and gets confused. These calls never go
anywhere if a backchannel transport to the target client isn't
available. Before the server can send any backchannel operation, the
client has to connect first and then do a BIND_CONN_TO_SESSION.
This patch doesn't address the root cause of the confusion, but
there's no need to queue up these optional operations if they can't
go anywhere.
Fixes: 44df6f439a17 ("NFSD: add delegation reaper to react to low memory condition")
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/nfsd/nfs4state.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index d53ad2249e4b..5e81c819c384 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -6699,14 +6699,19 @@ deleg_reaper(struct nfsd_net *nn) spin_lock(&nn->client_lock); list_for_each_safe(pos, next, &nn->client_lru) { clp = list_entry(pos, struct nfs4_client, cl_lru); - if (clp->cl_state != NFSD4_ACTIVE || - list_empty(&clp->cl_delegations) || - atomic_read(&clp->cl_delegs_in_recall) || - test_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags) || - (ktime_get_boottime_seconds() - - clp->cl_ra_time < 5)) { + + if (clp->cl_state != NFSD4_ACTIVE) + continue; + if (list_empty(&clp->cl_delegations)) + continue; + if (atomic_read(&clp->cl_delegs_in_recall)) + continue; + if (test_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags)) + continue; + if (ktime_get_boottime_seconds() - clp->cl_ra_time < 5) + continue; + if (clp->cl_cb_state != NFSD4_CB_UP) continue; - } list_add(&clp->cl_ra_cblist, &cblist); /* release in nfsd4_cb_recall_any_release */ |