[PATCH 2/4] ceph: update the __update_latency helper

[xiubli@redhat.com]

From: Xiubo Li <xiubli@redhat.com>

Let the __update_latency() helper choose the correcsponding members
according to the metric_type.

URL: https://tracker.ceph.com/issues/49913
Signed-off-by: Xiubo Li <xiubli@redhat.com>
---
 fs/ceph/metric.c | 58 +++++++++++++++++++++++++++++++++++-------------
 1 file changed, 42 insertions(+), 16 deletions(-)

diff --git a/fs/ceph/metric.c b/fs/ceph/metric.c
index 75d309f2fb0c..d5560ff99a9d 100644
--- a/fs/ceph/metric.c
+++ b/fs/ceph/metric.c
@@ -249,19 +249,51 @@ void ceph_metric_destroy(struct ceph_client_metric *m)
 		ceph_put_mds_session(m->session);
 }
 
-static inline void __update_latency(ktime_t *totalp, ktime_t *lsump,
-				    ktime_t *min, ktime_t *max,
-				    ktime_t *sq_sump, ktime_t lat)
+typedef enum {
+	CEPH_METRIC_READ,
+	CEPH_METRIC_WRITE,
+	CEPH_METRIC_METADATA,
+} metric_type;
+
+static inline void __update_latency(struct ceph_client_metric *m,
+				    metric_type type, ktime_t lat)
 {
+	ktime_t *totalp, *minp, *maxp, *lsump, *sq_sump;
 	ktime_t total, avg, sq, lsum;
 
+	switch (type) {
+	case CEPH_METRIC_READ:
+		totalp = &m->total_reads;
+		lsump = &m->read_latency_sum;
+		minp = &m->read_latency_min;
+		maxp = &m->read_latency_max;
+		sq_sump = &m->read_latency_sq_sum;
+		break;
+	case CEPH_METRIC_WRITE:
+		totalp = &m->total_writes;
+		lsump = &m->write_latency_sum;
+		minp = &m->write_latency_min;
+		maxp = &m->write_latency_max;
+		sq_sump = &m->write_latency_sq_sum;
+		break;
+	case CEPH_METRIC_METADATA:
+		totalp = &m->total_metadatas;
+		lsump = &m->metadata_latency_sum;
+		minp = &m->metadata_latency_min;
+		maxp = &m->metadata_latency_max;
+		sq_sump = &m->metadata_latency_sq_sum;
+		break;
+	default:
+		return;
+	}
+
 	total = ++(*totalp);
 	lsum = (*lsump += lat);
 
-	if (unlikely(lat < *min))
-		*min = lat;
-	if (unlikely(lat > *max))
-		*max = lat;
+	if (unlikely(lat < *minp))
+		*minp = lat;
+	if (unlikely(lat > *maxp))
+		*maxp = lat;
 
 	if (unlikely(total == 1))
 		return;
@@ -284,9 +316,7 @@ void ceph_update_read_metrics(struct ceph_client_metric *m,
 		return;
 
 	spin_lock(&m->read_metric_lock);
-	__update_latency(&m->total_reads, &m->read_latency_sum,
-			 &m->read_latency_min, &m->read_latency_max,
-			 &m->read_latency_sq_sum, lat);
+	__update_latency(m, CEPH_METRIC_READ, lat);
 	spin_unlock(&m->read_metric_lock);
 }
 
@@ -300,9 +330,7 @@ void ceph_update_write_metrics(struct ceph_client_metric *m,
 		return;
 
 	spin_lock(&m->write_metric_lock);
-	__update_latency(&m->total_writes, &m->write_latency_sum,
-			 &m->write_latency_min, &m->write_latency_max,
-			 &m->write_latency_sq_sum, lat);
+	__update_latency(m, CEPH_METRIC_WRITE, lat);
 	spin_unlock(&m->write_metric_lock);
 }
 
@@ -316,8 +344,6 @@ void ceph_update_metadata_metrics(struct ceph_client_metric *m,
 		return;
 
 	spin_lock(&m->metadata_metric_lock);
-	__update_latency(&m->total_metadatas, &m->metadata_latency_sum,
-			 &m->metadata_latency_min, &m->metadata_latency_max,
-			 &m->metadata_latency_sq_sum, lat);
+	__update_latency(m, CEPH_METRIC_METADATA, lat);
 	spin_unlock(&m->metadata_metric_lock);
 }
-- 
2.27.0