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NFS4: Add a trace event to record invalid CB sequence IDs 

Help debug NFSv4 callback failures.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2019-06-19 10:33:47 -04:00 committed by Anna Schumaker
parent 675dd90ad0
commit c5833f0dc4
2 changed files with 58 additions and 8 deletions
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28
fs/nfs/callback_proc.c
View File

@ -414,27 +414,39 @@ static __be32
validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
const struct cb_sequenceargs * args)
{
__be32 ret;
ret = cpu_to_be32(NFS4ERR_BADSLOT);
if (args->csa_slotid > tbl->server_highest_slotid)
return htonl(NFS4ERR_BADSLOT);
goto out_err;
/* Replay */
if (args->csa_sequenceid == slot->seq_nr) {
ret = cpu_to_be32(NFS4ERR_DELAY);
if (nfs4_test_locked_slot(tbl, slot->slot_nr))
return htonl(NFS4ERR_DELAY);
goto out_err;
/* Signal process_op to set this error on next op */
ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
if (args->csa_cachethis == 0)
return htonl(NFS4ERR_RETRY_UNCACHED_REP);
goto out_err;
/* Liar! We never allowed you to set csa_cachethis != 0 */
return htonl(NFS4ERR_SEQ_FALSE_RETRY);
ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
goto out_err;
}
/* Note: wraparound relies on seq_nr being of type u32 */
if (likely(args->csa_sequenceid == slot->seq_nr + 1))
return htonl(NFS4_OK);
/* Misordered request */
return htonl(NFS4ERR_SEQ_MISORDERED);
ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
if (args->csa_sequenceid != slot->seq_nr + 1)
goto out_err;
return cpu_to_be32(NFS4_OK);
out_err:
trace_nfs4_cb_seqid_err(args, ret);
return ret;
}
/*

38
fs/nfs/nfs4trace.h
View File

@ -490,6 +490,44 @@ TRACE_EVENT(nfs4_cb_sequence,
__entry->highest_slotid
)
);
TRACE_EVENT(nfs4_cb_seqid_err,
TP_PROTO(
const struct cb_sequenceargs *args,
__be32 status
),
TP_ARGS(args, status),
TP_STRUCT__entry(
__field(unsigned int, session)
__field(unsigned int, slot_nr)
__field(unsigned int, seq_nr)
__field(unsigned int, highest_slotid)
__field(unsigned int, cachethis)
__field(int, error)
),
TP_fast_assign(
__entry->session = nfs_session_id_hash(&args->csa_sessionid);
__entry->slot_nr = args->csa_slotid;
__entry->seq_nr = args->csa_sequenceid;
__entry->highest_slotid = args->csa_highestslotid;
__entry->cachethis = args->csa_cachethis;
__entry->error = -be32_to_cpu(status);
),
TP_printk(
"error=%d (%s) session=0x%08x slot_nr=%u seq_nr=%u "
"highest_slotid=%u",
__entry->error,
show_nfsv4_errors(__entry->error),
__entry->session,
__entry->slot_nr,
__entry->seq_nr,
__entry->highest_slotid
)
);
#endif /* CONFIG_NFS_V4_1 */
TRACE_EVENT(nfs4_setup_sequence,