ceph: use ktime_to_timespec64() rather than jiffies_to_timespec64()

Latencies are of type ktime_t, coverting from jiffies is incorrect.
Also, switch to "struct ceph_timespec" for r/w/m latencies.
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

fs/ceph/metric.c

@@ -8,6 +8,12 @@
 #include "metric.h"
 #include "mds_client.h"
 
+static void ktime_to_ceph_timespec(struct ceph_timespec *ts, ktime_t val)
+{
+	struct timespec64 t = ktime_to_timespec64(val);
+	ceph_encode_timespec64(ts, &t);
+}
+
 static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
 				   struct ceph_mds_session *s)
 {
@@ -26,7 +32,6 @@ static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
 	u64 nr_caps = atomic64_read(&m->total_caps);
 	u32 header_len = sizeof(struct ceph_metric_header);
 	struct ceph_msg *msg;
-	struct timespec64 ts;
 	s64 sum;
 	s32 items = 0;
 	s32 len;
@@ -63,9 +68,7 @@ static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
 	read->header.compat = 1;
 	read->header.data_len = cpu_to_le32(sizeof(*read) - header_len);
 	sum = m->metric[METRIC_READ].latency_sum;
-	jiffies_to_timespec64(sum, &ts);
-	read->sec = cpu_to_le32(ts.tv_sec);
-	read->nsec = cpu_to_le32(ts.tv_nsec);
+	ktime_to_ceph_timespec(&read->lat, sum);
 	items++;
 
 	/* encode the write latency metric */
@@ -75,9 +78,7 @@ static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
 	write->header.compat = 1;
 	write->header.data_len = cpu_to_le32(sizeof(*write) - header_len);
 	sum = m->metric[METRIC_WRITE].latency_sum;
-	jiffies_to_timespec64(sum, &ts);
-	write->sec = cpu_to_le32(ts.tv_sec);
-	write->nsec = cpu_to_le32(ts.tv_nsec);
+	ktime_to_ceph_timespec(&write->lat, sum);
 	items++;
 
 	/* encode the metadata latency metric */
@@ -87,9 +88,7 @@ static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
 	meta->header.compat = 1;
 	meta->header.data_len = cpu_to_le32(sizeof(*meta) - header_len);
 	sum = m->metric[METRIC_METADATA].latency_sum;
-	jiffies_to_timespec64(sum, &ts);
-	meta->sec = cpu_to_le32(ts.tv_sec);
-	meta->nsec = cpu_to_le32(ts.tv_nsec);
+	ktime_to_ceph_timespec(&meta->lat, sum);
 	items++;
 
 	/* encode the dentry lease metric */

fs/ceph/metric.h

@@ -2,7 +2,7 @@
 #ifndef _FS_CEPH_MDS_METRIC_H
 #define _FS_CEPH_MDS_METRIC_H
 
-#include <linux/types.h>
+#include <linux/ceph/types.h>
 #include <linux/percpu_counter.h>
 #include <linux/ktime.h>
 
@@ -60,22 +60,19 @@ struct ceph_metric_cap {
 /* metric read latency header */
 struct ceph_metric_read_latency {
 	struct ceph_metric_header header;
-	__le32 sec;
-	__le32 nsec;
+	struct ceph_timespec lat;
 } __packed;
 
 /* metric write latency header */
 struct ceph_metric_write_latency {
 	struct ceph_metric_header header;
-	__le32 sec;
-	__le32 nsec;
+	struct ceph_timespec lat;
 } __packed;
 
 /* metric metadata latency header */
 struct ceph_metric_metadata_latency {
 	struct ceph_metric_header header;
-	__le32 sec;
-	__le32 nsec;
+	struct ceph_timespec lat;
 } __packed;
 
 /* metric dentry lease header */