staging/lustre: use 64-bit times for request times

All request timestamps and deadlines in lustre are recorded in time_t
and timeval units, which overflow in 2038 on 32-bit systems.

In this patch, I'm converting them to time64_t and timespec64,
respectively. Unfortunately, this makes a relatively large patch,
but I could not find an obvious way to split it up some more without
breaking atomicity of the change.

Also unfortunately, this introduces two instances of div_u64_rem()
in the request path, which can be slow on 32-bit architectures. This
can probably be avoided by a larger restructuring of the code, but
it is unlikely that lustre is used in performance critical setups
on 32-bit architectures, so it seems better to optimize for correctness
rather than speed here.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/lustre_import.h

@@ -74,7 +74,7 @@ struct ptlrpc_at_array {
 	struct list_head       *paa_reqs_array; /** array to hold requests */
 	__u32	     paa_size;       /** the size of array */
 	__u32	     paa_count;      /** the total count of reqs */
-	time_t	    paa_deadline;   /** the earliest deadline of reqs */
+	time64_t     paa_deadline;   /** the earliest deadline of reqs */
 	__u32	    *paa_reqs_count; /** the count of reqs in each entry */
 };
 

drivers/staging/lustre/lustre/include/lustre_net.h

@@ -1440,7 +1440,7 @@ struct ptlrpc_request {
 
 	/* server-side... */
 	/** request arrival time */
-	struct timeval       rq_arrival_time;
+	struct timespec64	rq_arrival_time;
 	/** separated reply state */
 	struct ptlrpc_reply_state *rq_reply_state;
 	/** incoming request buffer */
@@ -1477,18 +1477,18 @@ struct ptlrpc_request {
 	/**
 	 * when request/reply sent (secs), or time when request should be sent
 	 */
-	time_t rq_sent;
+	time64_t rq_sent;
 	/** time for request really sent out */
-	time_t rq_real_sent;
+	time64_t rq_real_sent;
 
 	/** when request must finish. volatile
 	 * so that servers' early reply updates to the deadline aren't
 	 * kept in per-cpu cache */
-	volatile time_t rq_deadline;
+	volatile time64_t rq_deadline;
 	/** when req reply unlink must finish. */
-	time_t rq_reply_deadline;
+	time64_t rq_reply_deadline;
 	/** when req bulk unlink must finish. */
-	time_t rq_bulk_deadline;
+	time64_t rq_bulk_deadline;
 	/**
 	 * service time estimate (secs)
 	 * If the requestsis not served by this time, it is marked as timed out.
@@ -2323,7 +2323,7 @@ static inline int ptlrpc_client_bulk_active(struct ptlrpc_request *req)
 	desc = req->rq_bulk;
 
 	if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
-	    req->rq_bulk_deadline > get_seconds())
+	    req->rq_bulk_deadline > ktime_get_real_seconds())
 		return 1;
 
 	if (!desc)
@@ -2727,7 +2727,7 @@ static inline int
 ptlrpc_client_early(struct ptlrpc_request *req)
 {
 	if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
-	    req->rq_reply_deadline > get_seconds())
+	    req->rq_reply_deadline > ktime_get_real_seconds())
 		return 0;
 	return req->rq_early;
 }
@@ -2739,7 +2739,7 @@ static inline int
 ptlrpc_client_replied(struct ptlrpc_request *req)
 {
 	if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
-	    req->rq_reply_deadline > get_seconds())
+	    req->rq_reply_deadline > ktime_get_real_seconds())
 		return 0;
 	return req->rq_replied;
 }
@@ -2749,7 +2749,7 @@ static inline int
 ptlrpc_client_recv(struct ptlrpc_request *req)
 {
 	if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
-	    req->rq_reply_deadline > get_seconds())
+	    req->rq_reply_deadline > ktime_get_real_seconds())
 		return 1;
 	return req->rq_receiving_reply;
 }
@@ -2761,7 +2761,7 @@ ptlrpc_client_recv_or_unlink(struct ptlrpc_request *req)
 
 	spin_lock(&req->rq_lock);
 	if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
-	    req->rq_reply_deadline > get_seconds()) {
+	    req->rq_reply_deadline > ktime_get_real_seconds()) {
 		spin_unlock(&req->rq_lock);
 		return 1;
 	}

drivers/staging/lustre/lustre/mdc/mdc_locks.c

@@ -864,7 +864,7 @@ int mdc_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
 	if (resends) {
 		req->rq_generation_set = 1;
 		req->rq_import_generation = generation;
-		req->rq_sent = get_seconds() + resends;
+		req->rq_sent = ktime_get_real_seconds() + resends;
 	}
 
 	/* It is important to obtain rpc_lock first (if applicable), so that

drivers/staging/lustre/lustre/mdc/mdc_reint.c

@@ -271,7 +271,7 @@ int mdc_create(struct obd_export *exp, struct md_op_data *op_data,
 	if (resends) {
 		req->rq_generation_set = 1;
 		req->rq_import_generation = generation;
-		req->rq_sent = get_seconds() + resends;
+		req->rq_sent = ktime_get_real_seconds() + resends;
 	}
 	level = LUSTRE_IMP_FULL;
  resend:

drivers/staging/lustre/lustre/osc/osc_request.c

@@ -1690,9 +1690,9 @@ static int osc_brw_redo_request(struct ptlrpc_request *request,
 	/* cap resend delay to the current request timeout, this is similar to
 	 * what ptlrpc does (see after_reply()) */
 	if (aa->aa_resends > new_req->rq_timeout)
-		new_req->rq_sent = get_seconds() + new_req->rq_timeout;
+		new_req->rq_sent = ktime_get_real_seconds() + new_req->rq_timeout;
 	else
-		new_req->rq_sent = get_seconds() + aa->aa_resends;
+		new_req->rq_sent = ktime_get_real_seconds() + aa->aa_resends;
 	new_req->rq_generation_set = 1;
 	new_req->rq_import_generation = request->rq_import_generation;
 

drivers/staging/lustre/lustre/ptlrpc/client.c

@@ -282,7 +282,7 @@ static void ptlrpc_at_adj_net_latency(struct ptlrpc_request *req,
 {
 	unsigned int nl, oldnl;
 	struct imp_at *at;
-	time_t now = get_seconds();
+	time64_t now = ktime_get_real_seconds();
 
 	LASSERT(req->rq_import);
 
@@ -298,7 +298,7 @@ static void ptlrpc_at_adj_net_latency(struct ptlrpc_request *req,
 		       D_ADAPTTO : D_WARNING,
 		       "Reported service time %u > total measured time "
 		       CFS_DURATION_T"\n", service_time,
-		       cfs_time_sub(now, req->rq_sent));
+		       (long)(now - req->rq_sent));
 		return;
 	}
 
@@ -343,7 +343,7 @@ static int unpack_reply(struct ptlrpc_request *req)
 static int ptlrpc_at_recv_early_reply(struct ptlrpc_request *req)
 {
 	struct ptlrpc_request *early_req;
-	time_t olddl;
+	time64_t olddl;
 	int rc;
 
 	req->rq_early = 0;
@@ -378,14 +378,14 @@ static int ptlrpc_at_recv_early_reply(struct ptlrpc_request *req)
 	olddl = req->rq_deadline;
 	/* server assumes it now has rq_timeout from when it sent the
 	 * early reply, so client should give it at least that long. */
-	req->rq_deadline = get_seconds() + req->rq_timeout +
+	req->rq_deadline = ktime_get_real_seconds() + req->rq_timeout +
 			   ptlrpc_at_get_net_latency(req);
 
 	DEBUG_REQ(D_ADAPTTO, req,
-		  "Early reply #%d, new deadline in " CFS_DURATION_T "s (" CFS_DURATION_T "s)",
+		  "Early reply #%d, new deadline in %lds (%lds)",
 		  req->rq_early_count,
-		  cfs_time_sub(req->rq_deadline, get_seconds()),
-		  cfs_time_sub(req->rq_deadline, olddl));
+		  (long)(req->rq_deadline - ktime_get_real_seconds()),
+		  (long)(req->rq_deadline - olddl));
 
 	return rc;
 }
@@ -1203,7 +1203,7 @@ static int after_reply(struct ptlrpc_request *req)
 	struct obd_import *imp = req->rq_import;
 	struct obd_device *obd = req->rq_import->imp_obd;
 	int rc;
-	struct timeval work_start;
+	struct timespec64 work_start;
 	long timediff;
 
 	LASSERT(obd != NULL);
@@ -1253,7 +1253,7 @@ static int after_reply(struct ptlrpc_request *req)
 	/* retry indefinitely on EINPROGRESS */
 	if (lustre_msg_get_status(req->rq_repmsg) == -EINPROGRESS &&
 	    ptlrpc_no_resend(req) == 0 && !req->rq_no_retry_einprogress) {
-		time_t	now = get_seconds();
+		time64_t now = ktime_get_real_seconds();
 
 		DEBUG_REQ(D_RPCTRACE, req, "Resending request on EINPROGRESS");
 		spin_lock(&req->rq_lock);
@@ -1283,8 +1283,9 @@ static int after_reply(struct ptlrpc_request *req)
 		return 0;
 	}
 
-	do_gettimeofday(&work_start);
-	timediff = cfs_timeval_sub(&work_start, &req->rq_arrival_time, NULL);
+	ktime_get_real_ts64(&work_start);
+	timediff = (work_start.tv_sec - req->rq_arrival_time.tv_sec) * USEC_PER_SEC +
+		   (work_start.tv_nsec - req->rq_arrival_time.tv_nsec) / NSEC_PER_USEC;
 	if (obd->obd_svc_stats != NULL) {
 		lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR,
 				    timediff);
@@ -1401,7 +1402,7 @@ static int ptlrpc_send_new_req(struct ptlrpc_request *req)
 	int rc;
 
 	LASSERT(req->rq_phase == RQ_PHASE_NEW);
-	if (req->rq_sent && (req->rq_sent > get_seconds()) &&
+	if (req->rq_sent && (req->rq_sent > ktime_get_real_seconds()) &&
 	    (!req->rq_generation_set ||
 	     req->rq_import_generation == imp->imp_generation))
 		return 0;
@@ -1541,7 +1542,7 @@ int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
 
 		/* delayed resend - skip */
 		if (req->rq_phase == RQ_PHASE_RPC && req->rq_resend &&
-		    req->rq_sent > get_seconds())
+		    req->rq_sent > ktime_get_real_seconds())
 			continue;
 
 		if (!(req->rq_phase == RQ_PHASE_RPC ||
@@ -1902,14 +1903,13 @@ int ptlrpc_expire_one_request(struct ptlrpc_request *req, int async_unlink)
 	req->rq_timedout = 1;
 	spin_unlock(&req->rq_lock);
 
-	DEBUG_REQ(D_WARNING, req, "Request sent has %s: [sent "CFS_DURATION_T
-		  "/real "CFS_DURATION_T"]",
+	DEBUG_REQ(D_WARNING, req, "Request sent has %s: [sent %lld/real %lld]",
 		  req->rq_net_err ? "failed due to network error" :
 		     ((req->rq_real_sent == 0 ||
-		       time_before((unsigned long)req->rq_real_sent, (unsigned long)req->rq_sent) ||
-		       cfs_time_aftereq(req->rq_real_sent, req->rq_deadline)) ?
+		       req->rq_real_sent < req->rq_sent ||
+		       req->rq_real_sent >= req->rq_deadline) ?
 		      "timed out for sent delay" : "timed out for slow reply"),
-		  req->rq_sent, req->rq_real_sent);
+		  (s64)req->rq_sent, (s64)req->rq_real_sent);
 
 	if (imp != NULL && obd_debug_peer_on_timeout)
 		LNetCtl(IOC_LIBCFS_DEBUG_PEER, &imp->imp_connection->c_peer);
@@ -1967,7 +1967,7 @@ int ptlrpc_expired_set(void *data)
 {
 	struct ptlrpc_request_set *set = data;
 	struct list_head *tmp;
-	time_t now = get_seconds();
+	time64_t now = ktime_get_real_seconds();
 
 	LASSERT(set != NULL);
 
@@ -2050,10 +2050,10 @@ EXPORT_SYMBOL(ptlrpc_interrupted_set);
 int ptlrpc_set_next_timeout(struct ptlrpc_request_set *set)
 {
 	struct list_head *tmp;
-	time_t now = get_seconds();
+	time64_t now = ktime_get_real_seconds();
 	int timeout = 0;
 	struct ptlrpc_request *req;
-	int deadline;
+	time64_t deadline;
 
 	list_for_each(tmp, &set->set_requests) {
 		req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
@@ -2364,7 +2364,7 @@ int ptlrpc_unregister_reply(struct ptlrpc_request *request, int async)
 	 */
 	if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
 	    async && request->rq_reply_deadline == 0)
-		request->rq_reply_deadline = get_seconds()+LONG_UNLINK;
+		request->rq_reply_deadline = ktime_get_real_seconds()+LONG_UNLINK;
 
 	/*
 	 * Nothing left to do.
@@ -2939,7 +2939,7 @@ static spinlock_t ptlrpc_last_xid_lock;
 #define YEAR_2004 (1ULL << 30)
 void ptlrpc_init_xid(void)
 {
-	time_t now = get_seconds();
+	time64_t now = ktime_get_real_seconds();
 
 	spin_lock_init(&ptlrpc_last_xid_lock);
 	if (now < YEAR_2004) {
@@ -3028,7 +3028,7 @@ static void ptlrpcd_add_work_req(struct ptlrpc_request *req)
 {
 	/* re-initialize the req */
 	req->rq_timeout		= obd_timeout;
-	req->rq_sent		= get_seconds();
+	req->rq_sent		= ktime_get_real_seconds();
 	req->rq_deadline	= req->rq_sent + req->rq_timeout;
 	req->rq_reply_deadline	= req->rq_deadline;
 	req->rq_phase		= RQ_PHASE_INTERPRET;

drivers/staging/lustre/lustre/ptlrpc/events.c

@@ -64,7 +64,7 @@ void request_out_callback(lnet_event_t *ev)
 
 	sptlrpc_request_out_callback(req);
 	spin_lock(&req->rq_lock);
-	req->rq_real_sent = get_seconds();
+	req->rq_real_sent = ktime_get_real_seconds();
 	if (ev->unlinked)
 		req->rq_req_unlink = 0;
 
@@ -246,7 +246,7 @@ static void ptlrpc_req_add_history(struct ptlrpc_service_part *svcpt,
 				   struct ptlrpc_request *req)
 {
 	__u64 sec = req->rq_arrival_time.tv_sec;
-	__u32 usec = req->rq_arrival_time.tv_usec >> 4; /* usec / 16 */
+	__u32 usec = req->rq_arrival_time.tv_nsec / NSEC_PER_USEC / 16; /* usec / 16 */
 	__u64 new_seq;
 
 	/* set sequence ID for request and add it to history list,
@@ -327,7 +327,7 @@ void request_in_callback(lnet_event_t *ev)
 	req->rq_reqbuf = ev->md.start + ev->offset;
 	if (ev->type == LNET_EVENT_PUT && ev->status == 0)
 		req->rq_reqdata_len = ev->mlength;
-	do_gettimeofday(&req->rq_arrival_time);
+	ktime_get_real_ts64(&req->rq_arrival_time);
 	req->rq_peer = ev->initiator;
 	req->rq_self = ev->target.nid;
 	req->rq_rqbd = rqbd;

drivers/staging/lustre/lustre/ptlrpc/import.c

@@ -219,7 +219,7 @@ void ptlrpc_deactivate_import(struct obd_import *imp)
 EXPORT_SYMBOL(ptlrpc_deactivate_import);
 
 static unsigned int
-ptlrpc_inflight_deadline(struct ptlrpc_request *req, time_t now)
+ptlrpc_inflight_deadline(struct ptlrpc_request *req, time64_t now)
 {
 	long dl;
 
@@ -244,7 +244,7 @@ ptlrpc_inflight_deadline(struct ptlrpc_request *req, time_t now)
 
 static unsigned int ptlrpc_inflight_timeout(struct obd_import *imp)
 {
-	time_t now = get_seconds();
+	time64_t now = ktime_get_real_seconds();
 	struct list_head *tmp, *n;
 	struct ptlrpc_request *req;
 	unsigned int timeout = 0;

drivers/staging/lustre/lustre/ptlrpc/lproc_ptlrpc.c

@@ -945,13 +945,13 @@ static int ptlrpc_lprocfs_svc_req_history_show(struct seq_file *s, void *iter)
 		 * must be just as careful as the service's request
 		 * parser. Currently I only print stuff here I know is OK
 		 * to look at coz it was set up in request_in_callback()!!! */
-		seq_printf(s, "%lld:%s:%s:x%llu:%d:%s:%ld:%lds(%+lds) ",
+		seq_printf(s, "%lld:%s:%s:x%llu:%d:%s:%lld:%lds(%+lds) ",
 			   req->rq_history_seq, libcfs_nid2str(req->rq_self),
 			   libcfs_id2str(req->rq_peer), req->rq_xid,
 			   req->rq_reqlen, ptlrpc_rqphase2str(req),
-			   req->rq_arrival_time.tv_sec,
-			   req->rq_sent - req->rq_arrival_time.tv_sec,
-			   req->rq_sent - req->rq_deadline);
+			   (s64)req->rq_arrival_time.tv_sec,
+			   (long)(req->rq_sent - req->rq_arrival_time.tv_sec),
+			   (long)(req->rq_sent - req->rq_deadline));
 		if (svc->srv_ops.so_req_printer == NULL)
 			seq_printf(s, "\n");
 		else

drivers/staging/lustre/lustre/ptlrpc/niobuf.c

@@ -252,7 +252,7 @@ int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async)
 	/* Let's setup deadline for reply unlink. */
 	if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
 	    async && req->rq_bulk_deadline == 0)
-		req->rq_bulk_deadline = get_seconds() + LONG_UNLINK;
+		req->rq_bulk_deadline = ktime_get_real_seconds() + LONG_UNLINK;
 
 	if (ptlrpc_client_bulk_active(req) == 0)	/* completed or */
 		return 1;				/* never registered */
@@ -303,7 +303,7 @@ static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags)
 {
 	struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
 	struct ptlrpc_service *svc = svcpt->scp_service;
-	int service_time = max_t(int, get_seconds() -
+	int service_time = max_t(int, ktime_get_real_seconds() -
 				 req->rq_arrival_time.tv_sec, 1);
 
 	if (!(flags & PTLRPC_REPLY_EARLY) &&
@@ -421,7 +421,7 @@ int ptlrpc_send_reply(struct ptlrpc_request *req, int flags)
 	if (unlikely(rc))
 		goto out;
 
-	req->rq_sent = get_seconds();
+	req->rq_sent = ktime_get_real_seconds();
 
 	rc = ptl_send_buf(&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len,
 			  (rs->rs_difficult && !rs->rs_no_ack) ?
@@ -632,8 +632,8 @@ int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
 
 	OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);
 
-	do_gettimeofday(&request->rq_arrival_time);
-	request->rq_sent = get_seconds();
+	ktime_get_real_ts64(&request->rq_arrival_time);
+	request->rq_sent = ktime_get_real_seconds();
 	/* We give the server rq_timeout secs to process the req, and
 	   add the network latency for our local timeout. */
 	request->rq_deadline = request->rq_sent + request->rq_timeout +

drivers/staging/lustre/lustre/ptlrpc/pack_generic.c

@@ -2344,7 +2344,7 @@ void _debug_req(struct ptlrpc_request *req,
 
 	va_start(args, fmt);
 	libcfs_debug_vmsg2(msgdata, fmt, args,
-			   " req@%p x%llu/t%lld(%lld) o%d->%s@%s:%d/%d lens %d/%d e %d to %d dl " CFS_TIME_T " ref %d fl " REQ_FLAGS_FMT "/%x/%x rc %d/%d\n",
+			   " req@%p x%llu/t%lld(%lld) o%d->%s@%s:%d/%d lens %d/%d e %d to %lld dl %lld ref %d fl " REQ_FLAGS_FMT "/%x/%x rc %d/%d\n",
 			   req, req->rq_xid, req->rq_transno,
 			   req_ok ? lustre_msg_get_transno(req->rq_reqmsg) : 0,
 			   req_ok ? lustre_msg_get_opc(req->rq_reqmsg) : -1,
@@ -2356,8 +2356,8 @@ void _debug_req(struct ptlrpc_request *req,
 			   libcfs_nid2str(nid),
 			   req->rq_request_portal, req->rq_reply_portal,
 			   req->rq_reqlen, req->rq_replen,
-			   req->rq_early_count, req->rq_timedout,
-			   req->rq_deadline,
+			   req->rq_early_count, (s64)req->rq_timedout,
+			   (s64)req->rq_deadline,
 			   atomic_read(&req->rq_refcount),
 			   DEBUG_REQ_FLAGS(req),
 			   req_ok ? lustre_msg_get_flags(req->rq_reqmsg) : -1,

drivers/staging/lustre/lustre/ptlrpc/service.c

@@ -1160,7 +1160,7 @@ static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt)
 	}
 
 	/* Set timer for closest deadline */
-	next = (__s32)(array->paa_deadline - get_seconds() -
+	next = (__s32)(array->paa_deadline - ktime_get_real_seconds() -
 		       at_early_margin);
 	if (next <= 0) {
 		ptlrpc_at_timer((unsigned long)svcpt);
@@ -1191,7 +1191,7 @@ static int ptlrpc_at_add_timed(struct ptlrpc_request *req)
 	spin_lock(&svcpt->scp_at_lock);
 	LASSERT(list_empty(&req->rq_timed_list));
 
-	index = (unsigned long)req->rq_deadline % array->paa_size;
+	div_u64_rem(req->rq_deadline, array->paa_size, &index);
 	if (array->paa_reqs_count[index] > 0) {
 		/* latest rpcs will have the latest deadlines in the list,
 		 * so search backward. */
@@ -1250,8 +1250,8 @@ static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
 	struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
 	struct ptlrpc_request *reqcopy;
 	struct lustre_msg *reqmsg;
-	long olddl = req->rq_deadline - get_seconds();
-	time_t newdl;
+	long olddl = req->rq_deadline - ktime_get_real_seconds();
+	time64_t newdl;
 	int rc;
 
 	/* deadline is when the client expects us to reply, margin is the
@@ -1293,21 +1293,21 @@ static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req)
 		/* Fake our processing time into the future to ask the clients
 		 * for some extra amount of time */
 		at_measured(&svcpt->scp_at_estimate, at_extra +
-			    get_seconds() -
+			    ktime_get_real_seconds() -
 			    req->rq_arrival_time.tv_sec);
 
 		/* Check to see if we've actually increased the deadline -
 		 * we may be past adaptive_max */
 		if (req->rq_deadline >= req->rq_arrival_time.tv_sec +
 		    at_get(&svcpt->scp_at_estimate)) {
-			DEBUG_REQ(D_WARNING, req, "Couldn't add any time (%ld/%ld), not sending early reply\n",
+			DEBUG_REQ(D_WARNING, req, "Couldn't add any time (%ld/%lld), not sending early reply\n",
 				  olddl, req->rq_arrival_time.tv_sec +
 				  at_get(&svcpt->scp_at_estimate) -
-				  get_seconds());
+				  ktime_get_real_seconds());
 			return -ETIMEDOUT;
 		}
 	}
-	newdl = get_seconds() + at_get(&svcpt->scp_at_estimate);
+	newdl = ktime_get_real_seconds() + at_get(&svcpt->scp_at_estimate);
 
 	reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
 	if (reqcopy == NULL)
@@ -1390,8 +1390,8 @@ static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
 	struct ptlrpc_request *rq, *n;
 	struct list_head work_list;
 	__u32 index, count;
-	time_t deadline;
-	time_t now = get_seconds();
+	time64_t deadline;
+	time64_t now = ktime_get_real_seconds();
 	long delay;
 	int first, counter = 0;
 
@@ -1421,7 +1421,7 @@ static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
 	   server will take. Send early replies to everyone expiring soon. */
 	INIT_LIST_HEAD(&work_list);
 	deadline = -1;
-	index = (unsigned long)array->paa_deadline % array->paa_size;
+	div_u64_rem(array->paa_deadline, array->paa_size, &index);
 	count = array->paa_count;
 	while (count > 0) {
 		count -= array->paa_reqs_count[index];
@@ -1463,7 +1463,7 @@ static int ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
 		   chance to send early replies */
 		LCONSOLE_WARN("%s: This server is not able to keep up with request traffic (cpu-bound).\n",
 			      svcpt->scp_service->srv_name);
-		CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=" CFS_DURATION_T "(jiff)\n",
+		CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%ld(jiff)\n",
 		      counter, svcpt->scp_nreqs_incoming,
 		      svcpt->scp_nreqs_active,
 		      at_get(&svcpt->scp_at_estimate), delay);
@@ -1834,9 +1834,9 @@ ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt,
 	}
 
 	/* req_in handling should/must be fast */
-	if (get_seconds() - req->rq_arrival_time.tv_sec > 5)
+	if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5)
 		DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
-			  cfs_time_sub(get_seconds(),
+			  (long)(ktime_get_real_seconds() -
 				 req->rq_arrival_time.tv_sec));
 
 	/* Set rpc server deadline and add it to the timed list */
@@ -1878,9 +1878,12 @@ ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
 {
 	struct ptlrpc_service *svc = svcpt->scp_service;
 	struct ptlrpc_request *request;
-	struct timeval work_start;
-	struct timeval work_end;
-	long timediff;
+	struct timespec64 work_start;
+	struct timespec64 work_end;
+	struct timespec64 timediff;
+	struct timespec64 arrived;
+	unsigned long timediff_usecs;
+	unsigned long arrived_usecs;
 	int rc;
 	int fail_opc = 0;
 
@@ -1903,12 +1906,13 @@ ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
 	if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG))
 		libcfs_debug_dumplog();
 
-	do_gettimeofday(&work_start);
-	timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,
-				   NULL);
+	ktime_get_real_ts64(&work_start);
+	timediff = timespec64_sub(work_start, request->rq_arrival_time);
+	timediff_usecs = timediff.tv_sec * USEC_PER_SEC +
+			 timediff.tv_nsec / NSEC_PER_USEC;
 	if (likely(svc->srv_stats != NULL)) {
 		lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
-				    timediff);
+				    timediff_usecs);
 		lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR,
 				    svcpt->scp_nreqs_incoming);
 		lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR,
@@ -1935,17 +1939,18 @@ ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
 	if (likely(request->rq_export)) {
 		if (unlikely(ptlrpc_check_req(request)))
 			goto put_conn;
-		ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
+		ptlrpc_update_export_timer(request->rq_export,
+					   timediff_usecs >> 19);
 	}
 
 	/* Discard requests queued for longer than the deadline.
 	   The deadline is increased if we send an early reply. */
-	if (get_seconds() > request->rq_deadline) {
+	if (ktime_get_real_seconds() > request->rq_deadline) {
 		DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s: deadline " CFS_DURATION_T ":" CFS_DURATION_T "s ago\n",
 			  libcfs_id2str(request->rq_peer),
-			  cfs_time_sub(request->rq_deadline,
+			  (long)(request->rq_deadline -
 				 request->rq_arrival_time.tv_sec),
-			  cfs_time_sub(get_seconds(),
+			  (long)(ktime_get_real_seconds() -
 				 request->rq_deadline));
 		goto put_conn;
 	}
@@ -1971,19 +1976,22 @@ ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
 	lu_context_exit(&request->rq_session);
 	lu_context_fini(&request->rq_session);
 
-	if (unlikely(get_seconds() > request->rq_deadline)) {
+	if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) {
 		DEBUG_REQ(D_WARNING, request,
-			  "Request took longer than estimated ("
-				CFS_DURATION_T":"CFS_DURATION_T
-				"s); client may timeout.",
-			  cfs_time_sub(request->rq_deadline,
-				       request->rq_arrival_time.tv_sec),
-			  cfs_time_sub(get_seconds(),
-				       request->rq_deadline));
-	}
-
-	do_gettimeofday(&work_end);
-	timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
+			  "Request took longer than estimated (%lld:%llds); "
+			  "client may timeout.",
+			  (s64)request->rq_deadline -
+			       request->rq_arrival_time.tv_sec,
+			  (s64)ktime_get_real_seconds() - request->rq_deadline);
+	}
+
+	ktime_get_real_ts64(&work_end);
+	timediff = timespec64_sub(work_end, work_start);
+	timediff_usecs = timediff.tv_sec * USEC_PER_SEC +
+			 timediff.tv_nsec / NSEC_PER_USEC;
+	arrived = timespec64_sub(work_end, request->rq_arrival_time);
+	arrived_usecs = arrived.tv_sec * USEC_PER_SEC +
+			 arrived.tv_nsec / NSEC_PER_USEC;
 	CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d Request processed in %ldus (%ldus total) trans %llu rc %d/%d\n",
 	       current_comm(),
 	       (request->rq_export ?
@@ -1994,8 +2002,8 @@ ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
 	       request->rq_xid,
 	       libcfs_id2str(request->rq_peer),
 	       lustre_msg_get_opc(request->rq_reqmsg),
-	       timediff,
-	       cfs_timeval_sub(&work_end, &request->rq_arrival_time, NULL),
+	       timediff_usecs,
+	       arrived_usecs,
 	       (request->rq_repmsg ?
 		lustre_msg_get_transno(request->rq_repmsg) :
 		request->rq_transno),
@@ -2009,16 +2017,15 @@ ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt,
 			LASSERT(opc < LUSTRE_MAX_OPCODES);
 			lprocfs_counter_add(svc->srv_stats,
 					    opc + EXTRA_MAX_OPCODES,
-					    timediff);
+					    timediff_usecs);
 		}
 	}
 	if (unlikely(request->rq_early_count)) {
 		DEBUG_REQ(D_ADAPTTO, request,
-			  "sent %d early replies before finishing in "
-			  CFS_DURATION_T"s",
+			  "sent %d early replies before finishing in %llds",
 			  request->rq_early_count,
-			  cfs_time_sub(work_end.tv_sec,
-			  request->rq_arrival_time.tv_sec));
+			  (s64)work_end.tv_sec -
+			  request->rq_arrival_time.tv_sec);
 	}
 
 out_req:
@@ -3057,10 +3064,10 @@ EXPORT_SYMBOL(ptlrpc_unregister_service);
 static int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
 {
 	struct ptlrpc_request *request = NULL;
-	struct timeval right_now;
-	long timediff;
+	struct timespec64 right_now;
+	struct timespec64 timediff;
 
-	do_gettimeofday(&right_now);
+	ktime_get_real_ts64(&right_now);
 
 	spin_lock(&svcpt->scp_req_lock);
 	/* How long has the next entry been waiting? */
@@ -3074,13 +3081,13 @@ static int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
 		return 0;
 	}
 
-	timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
+	timediff = timespec64_sub(right_now, request->rq_arrival_time);
 	spin_unlock(&svcpt->scp_req_lock);
 
-	if ((timediff / ONE_MILLION) >
+	if ((timediff.tv_sec) >
 	    (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
-		CERROR("%s: unhealthy - request has been waiting %lds\n",
-		       svcpt->scp_service->srv_name, timediff / ONE_MILLION);
+		CERROR("%s: unhealthy - request has been waiting %llds\n",
+		       svcpt->scp_service->srv_name, (s64)timediff.tv_sec);
 		return -1;
 	}