When testing pnfs layout, nfsd got error NFS4ERR_SEQ_MISORDERED.
It is caused by nfs return NFS4ERR_DELAY before validate_seqid(),
don't update the sequnce id, but nfsd updates the sequnce id !!!
According to RFC5661 20.9.3,
" If CB_SEQUENCE returns an error, then the state of the slot
(sequence ID, cached reply) MUST NOT change. "
Signed-off-by: Kinglong Mee <kinglongmee@xxxxxxxxx>
---
fs/nfsd/nfs4callback.c | 14 ++++++++++++--
fs/nfsd/state.h | 1 +
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 8b1ac8d..a492018 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -455,6 +455,7 @@ static int decode_cb_sequence4res(struct xdr_stream *xdr,
if (unlikely(status || cb->cb_status))
return status;
+ cb->cb_update_seq_nr = true;
return decode_cb_sequence4resok(xdr, cb);
}
@@ -875,6 +876,7 @@ static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
u32 minorversion = clp->cl_minorversion;
cb->cb_minorversion = minorversion;
+ cb->cb_update_seq_nr = false;
cb->cb_status = 0;
if (minorversion) {
if (!nfsd41_cb_get_slot(clp, task))
@@ -892,9 +894,16 @@ static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
clp->cl_minorversion);
if (clp->cl_minorversion) {
- /* No need for lock, access serialized in nfsd4_cb_prepare */
- if (!task->tk_status)
+ /*
+ * No need for lock, access serialized in nfsd4_cb_prepare
+ *
+ * RFC5661 20.9.3
+ * If CB_SEQUENCE returns an error, then the state of the slot
+ * (sequence ID, cached reply) MUST NOT change.
+ */
+ if (cb->cb_update_seq_nr)
++clp->cl_cb_session->se_cb_seq_nr;
+
clear_bit(0, &clp->cl_cb_slot_busy);
rpc_wake_up_next(&clp->cl_cb_waitq);
dprintk("%s: freed slot, new seqid=%d\n", __func__,
@@ -1091,6 +1100,7 @@ void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
cb->cb_ops = ops;
INIT_WORK(&cb->cb_work, nfsd4_run_cb_work);
cb->cb_status = 0;
+ cb->cb_update_seq_nr = false;
cb->cb_need_restart = false;
}
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index dbc4f85..4ed7c2a 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -68,6 +68,7 @@ struct nfsd4_callback {
struct nfsd4_callback_ops *cb_ops;
struct work_struct cb_work;
int cb_status;
+ bool cb_update_seq_nr;
bool cb_need_restart;
};
--
2.4.2
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