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NFSD: Add tracepoints for SETCLIENTID edge cases

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Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2021-05-14 15:56:13 -04:00 committed by J. Bruce Fields
parent 2958d2ee71
commit 237f91c85a
2 changed files with 45 additions and 11 deletions
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19
fs/nfsd/nfs4state.c
View File

@ -3976,11 +3976,9 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
new = create_client(clname, rqstp, &clverifier);
if (new == NULL)
return nfserr_jukebox;
/* Cases below refer to rfc 3530 section 14.2.33: */
spin_lock(&nn->client_lock);
conf = find_confirmed_client_by_name(&clname, nn);
if (conf && client_has_state(conf)) {
/* case 0: */
status = nfserr_clid_inuse;
if (clp_used_exchangeid(conf))
goto out;
@ -3992,7 +3990,6 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
unconf = find_unconfirmed_client_by_name(&clname, nn);
if (unconf)
unhash_client_locked(unconf);
/* We need to handle only case 1: probable callback update */
if (conf) {
if (same_verf(&conf->cl_verifier, &clverifier)) {
copy_clid(new, conf);
@ -4000,7 +3997,8 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
} else
trace_nfsd_clid_verf_mismatch(conf, rqstp,
&clverifier);
}
} else
trace_nfsd_clid_fresh(new);
new->cl_minorversion = 0;
gen_callback(new, setclid, rqstp);
add_to_unconfirmed(new);
@ -4013,12 +4011,13 @@ out:
spin_unlock(&nn->client_lock);
if (new)
free_client(new);
if (unconf)
if (unconf) {
trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
expire_client(unconf);
}
return status;
}
__be32
nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
@ -4055,21 +4054,19 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
trace_nfsd_clid_cred_mismatch(conf, rqstp);
goto out;
}
/* cases below refer to rfc 3530 section 14.2.34: */
if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
if (conf && same_verf(&confirm, &conf->cl_confirm)) {
/* case 2: probable retransmit */
status = nfs_ok;
} else /* case 4: client hasn't noticed we rebooted yet? */
} else
status = nfserr_stale_clientid;
goto out;
}
status = nfs_ok;
if (conf) { /* case 1: callback update */
if (conf) {
old = unconf;
unhash_client_locked(old);
nfsd4_change_callback(conf, &unconf->cl_cb_conn);
} else { /* case 3: normal case; new or rebooted client */
} else {
old = find_confirmed_client_by_name(&unconf->cl_name, nn);
if (old) {
status = nfserr_clid_inuse;

37
fs/nfsd/trace.h
View File

@ -511,6 +511,7 @@ DEFINE_EVENT(nfsd_clientid_class, nfsd_clid_##name, \
TP_PROTO(const clientid_t *clid), \
TP_ARGS(clid))
DEFINE_CLIENTID_EVENT(expire_unconf);
DEFINE_CLIENTID_EVENT(reclaim_complete);
DEFINE_CLIENTID_EVENT(confirmed);
DEFINE_CLIENTID_EVENT(destroyed);
@ -600,6 +601,42 @@ TRACE_EVENT(nfsd_clid_verf_mismatch,
)
);
DECLARE_EVENT_CLASS(nfsd_clid_class,
TP_PROTO(const struct nfs4_client *clp),
TP_ARGS(clp),
TP_STRUCT__entry(
__field(u32, cl_boot)
__field(u32, cl_id)
__array(unsigned char, addr, sizeof(struct sockaddr_in6))
__field(unsigned long, flavor)
__array(unsigned char, verifier, NFS4_VERIFIER_SIZE)
__dynamic_array(char, name, clp->cl_name.len + 1)
),
TP_fast_assign(
__entry->cl_boot = clp->cl_clientid.cl_boot;
__entry->cl_id = clp->cl_clientid.cl_id;
memcpy(__entry->addr, &clp->cl_addr,
sizeof(struct sockaddr_in6));
__entry->flavor = clp->cl_cred.cr_flavor;
memcpy(__entry->verifier, (void *)&clp->cl_verifier,
NFS4_VERIFIER_SIZE);
memcpy(__get_str(name), clp->cl_name.data, clp->cl_name.len);
__get_str(name)[clp->cl_name.len] = '\0';
),
TP_printk("addr=%pISpc name='%s' verifier=0x%s flavor=%s client=%08x:%08x",
__entry->addr, __get_str(name),
__print_hex_str(__entry->verifier, NFS4_VERIFIER_SIZE),
show_nfsd_authflavor(__entry->flavor),
__entry->cl_boot, __entry->cl_id)
);
#define DEFINE_CLID_EVENT(name) \
DEFINE_EVENT(nfsd_clid_class, nfsd_clid_##name, \
TP_PROTO(const struct nfs4_client *clp), \
TP_ARGS(clp))
DEFINE_CLID_EVENT(fresh);
/*
* from fs/nfsd/filecache.h
*/