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NFSD: Add tracepoints to the NFSD state management code

Browse source 
Capture obvious events and replace dprintk() call sites. Introduce
infrastructure so that adding more tracepoints in this code later
is simplified.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-04-05 11:42:29 -04:00
parent 0b175b1864
commit dd5e3fbc1f
3 changed files with 152 additions and 40 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

52
fs/nfsd/nfs4state.c
View file

@ -51,6 +51,7 @@
#include "netns.h"
#include "pnfs.h"
#include "filecache.h"
#include "trace.h"
#define NFSDDBG_FACILITY NFSDDBG_PROC
@ -167,9 +168,6 @@ renew_client_locked(struct nfs4_client *clp)
return;
}
dprintk("renewing client (clientid %08x/%08x)\n",
clp->cl_clientid.cl_boot,
clp->cl_clientid.cl_id);
list_move_tail(&clp->cl_lru, &nn->client_lru);
clp->cl_time = ktime_get_boottime_seconds();
}
@ -1922,8 +1920,7 @@ STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
*/
if (clid->cl_boot == (u32)nn->boot_time)
return 0;
dprintk("NFSD stale clientid (%08x/%08x) boot_time %08llx\n",
clid->cl_boot, clid->cl_id, nn->boot_time);
trace_nfsd_clid_stale(clid);
return 1;
}
@ -3879,11 +3876,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
if (clp_used_exchangeid(conf))
goto out;
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
char addr_str[INET6_ADDRSTRLEN];
rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
sizeof(addr_str));
dprintk("NFSD: setclientid: string in use by client "
"at %s\n", addr_str);
trace_nfsd_clid_inuse_err(conf);
goto out;
}
}
@ -4076,7 +4069,6 @@ nfsd4_init_slabs(void)
out_free_client_slab:
kmem_cache_destroy(client_slab);
out:
dprintk("nfsd4: out of memory while initializing nfsv4\n");
return -ENOMEM;
}
@ -4508,6 +4500,8 @@ nfsd_break_deleg_cb(struct file_lock *fl)
struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
struct nfs4_file *fp = dp->dl_stid.sc_file;
trace_nfsd_deleg_break(&dp->dl_stid.sc_stateid);
/*
* We don't want the locks code to timeout the lease for us;
* we'll remove it ourself if a delegation isn't returned
@ -5018,8 +5012,7 @@ nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
STATEID_VAL(&dp->dl_stid.sc_stateid));
trace_nfsd_deleg_open(&dp->dl_stid.sc_stateid);
open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
nfs4_put_stid(&dp->dl_stid);
return;
@ -5136,9 +5129,7 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
nfs4_open_delegation(current_fh, open, stp);
nodeleg:
status = nfs_ok;
dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
STATEID_VAL(&stp->st_stid.sc_stateid));
trace_nfsd_deleg_none(&stp->st_stid.sc_stateid);
out:
/* 4.1 client trying to upgrade/downgrade delegation? */
if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
@ -5192,8 +5183,7 @@ nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
__be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
dprintk("process_renew(%08x/%08x): starting\n",
clid->cl_boot, clid->cl_id);
trace_nfsd_clid_renew(clid);
status = lookup_clientid(clid, cstate, nn, false);
if (status)
goto out;
@ -5214,6 +5204,7 @@ nfsd4_end_grace(struct nfsd_net *nn)
if (nn->grace_ended)
return;
trace_nfsd_grace_complete(nn);
nn->grace_ended = true;
/*
* If the server goes down again right now, an NFSv4
@ -5279,13 +5270,10 @@ nfs4_laundromat(struct nfsd_net *nn)
copy_stateid_t *cps_t;
int i;
dprintk("NFSD: laundromat service - starting\n");
if (clients_still_reclaiming(nn)) {
new_timeo = 0;
goto out;
}
dprintk("NFSD: end of grace period\n");
nfsd4_end_grace(nn);
INIT_LIST_HEAD(&reaplist);
@ -5307,8 +5295,7 @@ nfs4_laundromat(struct nfsd_net *nn)
break;
}
if (mark_client_expired_locked(clp)) {
dprintk("NFSD: client in use (clientid %08x)\n",
clp->cl_clientid.cl_id);
trace_nfsd_clid_expired(&clp->cl_clientid);
continue;
}
list_add(&clp->cl_lru, &reaplist);
@ -5316,8 +5303,7 @@ nfs4_laundromat(struct nfsd_net *nn)
spin_unlock(&nn->client_lock);
list_for_each_safe(pos, next, &reaplist) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
dprintk("NFSD: purging unused client (clientid %08x)\n",
clp->cl_clientid.cl_id);
trace_nfsd_clid_purged(&clp->cl_clientid);
list_del_init(&clp->cl_lru);
expire_client(clp);
}
@ -5407,7 +5393,6 @@ laundromat_main(struct work_struct *laundry)
laundromat_work);
t = nfs4_laundromat(nn);
dprintk("NFSD: laundromat_main - sleeping for %lld seconds\n", t);
queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
}
@ -5948,8 +5933,7 @@ nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
struct nfs4_stid *s;
struct nfs4_ol_stateid *stp = NULL;
dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
seqid, STATEID_VAL(stateid));
trace_nfsd_preprocess(seqid, stateid);
*stpp = NULL;
status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
@ -6018,9 +6002,7 @@ nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
oo->oo_flags |= NFS4_OO_CONFIRMED;
nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
mutex_unlock(&stp->st_mutex);
dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
__func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
trace_nfsd_open_confirm(oc->oc_seqid, &stp->st_stid.sc_stateid);
nfsd4_client_record_create(oo->oo_owner.so_client);
status = nfs_ok;
put_stateid:
@ -7072,7 +7054,7 @@ nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
unsigned int strhashval;
struct nfs4_client_reclaim *crp;
dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", name.len, name.data);
trace_nfsd_clid_reclaim(nn, name.len, name.data);
crp = alloc_reclaim();
if (crp) {
strhashval = clientstr_hashval(name);
@ -7122,7 +7104,7 @@ nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
unsigned int strhashval;
struct nfs4_client_reclaim *crp = NULL;
dprintk("NFSD: nfs4_find_reclaim_client for name %.*s\n", name.len, name.data);
trace_nfsd_clid_find(nn, name.len, name.data);
strhashval = clientstr_hashval(name);
list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
@ -7686,6 +7668,9 @@ nfsd_recall_delegations(struct list_head *reaplist)
list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
list_del_init(&dp->dl_recall_lru);
clp = dp->dl_stid.sc_client;
trace_nfsd_deleg_recall(&dp->dl_stid.sc_stateid);
/*
* We skipped all entries that had a zero dl_time before,
* so we can now reset the dl_time back to 0. If a delegation
@ -7868,6 +7853,7 @@ nfs4_state_start_net(struct net *net)
goto skip_grace;
printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n",
nn->nfsd4_grace, net->ns.inum);
trace_nfsd_grace_start(nn);
queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
return 0;

7
fs/nfsd/state.h
View file

@ -64,13 +64,6 @@ typedef struct {
refcount_t sc_count;
} copy_stateid_t;
#define STATEID_FMT "(%08x/%08x/%08x/%08x)"
#define STATEID_VAL(s) \
(s)->si_opaque.so_clid.cl_boot, \
(s)->si_opaque.so_clid.cl_id, \
(s)->si_opaque.so_id, \
(s)->si_generation
struct nfsd4_callback {
struct nfs4_client *cb_clp;
struct rpc_message cb_msg;

133
fs/nfsd/trace.h
View file

@ -277,6 +277,7 @@ DECLARE_EVENT_CLASS(nfsd_stateid_class,
DEFINE_EVENT(nfsd_stateid_class, nfsd_##name, \
TP_PROTO(stateid_t *stp), \
TP_ARGS(stp))
DEFINE_STATEID_EVENT(layoutstate_alloc);
DEFINE_STATEID_EVENT(layoutstate_unhash);
DEFINE_STATEID_EVENT(layoutstate_free);
@ -288,6 +289,138 @@ DEFINE_STATEID_EVENT(layout_recall_done);
DEFINE_STATEID_EVENT(layout_recall_fail);
DEFINE_STATEID_EVENT(layout_recall_release);
DEFINE_STATEID_EVENT(deleg_open);
DEFINE_STATEID_EVENT(deleg_none);
DEFINE_STATEID_EVENT(deleg_break);
DEFINE_STATEID_EVENT(deleg_recall);
DECLARE_EVENT_CLASS(nfsd_stateseqid_class,
TP_PROTO(u32 seqid, const stateid_t *stp),
TP_ARGS(seqid, stp),
TP_STRUCT__entry(
__field(u32, seqid)
__field(u32, cl_boot)
__field(u32, cl_id)
__field(u32, si_id)
__field(u32, si_generation)
),
TP_fast_assign(
__entry->seqid = seqid;
__entry->cl_boot = stp->si_opaque.so_clid.cl_boot;
__entry->cl_id = stp->si_opaque.so_clid.cl_id;
__entry->si_id = stp->si_opaque.so_id;
__entry->si_generation = stp->si_generation;
),
TP_printk("seqid=%u client %08x:%08x stateid %08x:%08x",
__entry->seqid, __entry->cl_boot, __entry->cl_id,
__entry->si_id, __entry->si_generation)
)
#define DEFINE_STATESEQID_EVENT(name) \
DEFINE_EVENT(nfsd_stateseqid_class, nfsd_##name, \
TP_PROTO(u32 seqid, const stateid_t *stp), \
TP_ARGS(seqid, stp))
DEFINE_STATESEQID_EVENT(preprocess);
DEFINE_STATESEQID_EVENT(open_confirm);
DECLARE_EVENT_CLASS(nfsd_clientid_class,
TP_PROTO(const clientid_t *clid),
TP_ARGS(clid),
TP_STRUCT__entry(
__field(u32, cl_boot)
__field(u32, cl_id)
),
TP_fast_assign(
__entry->cl_boot = clid->cl_boot;
__entry->cl_id = clid->cl_id;
),
TP_printk("client %08x:%08x", __entry->cl_boot, __entry->cl_id)
)
#define DEFINE_CLIENTID_EVENT(name) \
DEFINE_EVENT(nfsd_clientid_class, nfsd_clid_##name, \
TP_PROTO(const clientid_t *clid), \
TP_ARGS(clid))
DEFINE_CLIENTID_EVENT(expired);
DEFINE_CLIENTID_EVENT(purged);
DEFINE_CLIENTID_EVENT(renew);
DEFINE_CLIENTID_EVENT(stale);
DECLARE_EVENT_CLASS(nfsd_net_class,
TP_PROTO(const struct nfsd_net *nn),
TP_ARGS(nn),
TP_STRUCT__entry(
__field(unsigned long long, boot_time)
),
TP_fast_assign(
__entry->boot_time = nn->boot_time;
),
TP_printk("boot_time=%16llx", __entry->boot_time)
)
#define DEFINE_NET_EVENT(name) \
DEFINE_EVENT(nfsd_net_class, nfsd_##name, \
TP_PROTO(const struct nfsd_net *nn), \
TP_ARGS(nn))
DEFINE_NET_EVENT(grace_start);
DEFINE_NET_EVENT(grace_complete);
DECLARE_EVENT_CLASS(nfsd_clid_class,
TP_PROTO(const struct nfsd_net *nn,
unsigned int namelen,
const unsigned char *namedata),
TP_ARGS(nn, namelen, namedata),
TP_STRUCT__entry(
__field(unsigned long long, boot_time)
__field(unsigned int, namelen)
__dynamic_array(unsigned char, name, namelen)
),
TP_fast_assign(
__entry->boot_time = nn->boot_time;
__entry->namelen = namelen;
memcpy(__get_dynamic_array(name), namedata, namelen);
),
TP_printk("boot_time=%16llx nfs4_clientid=%.*s",
__entry->boot_time, __entry->namelen, __get_str(name))
)
#define DEFINE_CLID_EVENT(name) \
DEFINE_EVENT(nfsd_clid_class, nfsd_clid_##name, \
TP_PROTO(const struct nfsd_net *nn, \
unsigned int namelen, \
const unsigned char *namedata), \
TP_ARGS(nn, namelen, namedata))
DEFINE_CLID_EVENT(find);
DEFINE_CLID_EVENT(reclaim);
TRACE_EVENT(nfsd_clid_inuse_err,
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 int, namelen)
__dynamic_array(unsigned char, name, clp->cl_name.len)
),
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->namelen = clp->cl_name.len;
memcpy(__get_dynamic_array(name), clp->cl_name.data,
clp->cl_name.len);
),
TP_printk("nfs4_clientid %.*s already in use by %pISpc, client %08x:%08x",
__entry->namelen, __get_str(name), __entry->addr,
__entry->cl_boot, __entry->cl_id)
)
TRACE_DEFINE_ENUM(NFSD_FILE_HASHED);
TRACE_DEFINE_ENUM(NFSD_FILE_PENDING);
TRACE_DEFINE_ENUM(NFSD_FILE_BREAK_READ);