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/nfs/callback_proc.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index 197806f..7e9653a 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -327,10 +327,8 @@ validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
dprintk("%s slot table seqid: %u\n", __func__, slot->seq_nr);
/* Normal */
- if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
- slot->seq_nr++;
+ if (likely(args->csa_sequenceid == slot->seq_nr + 1))
goto out_ok;
- }
/* Replay */
if (args->csa_sequenceid == slot->seq_nr) {
@@ -418,6 +416,7 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
struct cb_process_state *cps)
{
struct nfs4_slot_table *tbl;
+ struct nfs4_slot *slot;
struct nfs_client *clp;
int i;
__be32 status = htonl(NFS4ERR_BADSESSION);
@@ -429,7 +428,9 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
goto out;
+
tbl = &clp->cl_session->bc_slot_table;
+ slot = tbl->slots + args->csa_slotid;
spin_lock(&tbl->slot_tbl_lock);
/* state manager is resetting the session */
@@ -444,7 +445,7 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
goto out;
}
- status = validate_seqid(&clp->cl_session->bc_slot_table, args);
+ status = validate_seqid(tbl, args);
spin_unlock(&tbl->slot_tbl_lock);
if (status)
goto out;
@@ -468,6 +469,13 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
+ /*
+ * RFC5661 20.9.3
+ * If CB_SEQUENCE returns an error, then the state of the slot
+ * (sequence ID, cached reply) MUST NOT change.
+ */
+ slot->seq_nr++;
+
out:
cps->clp = clp; /* put in nfs4_callback_compound */
for (i = 0; i < args->csa_nrclists; i++)
--
2.4.2
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
