[v2] ceph: send opened files/pinned caps/opened inodes metrics to MDS daemon

diff --git a/fs/ceph/metric.c b/fs/ceph/metric.c
index 5ec94bd4c1de..895eab25d314 100644
--- a/fs/ceph/metric.c
+++ b/fs/ceph/metric.c
@@ -17,6 +17,9 @@  static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
 	struct ceph_metric_write_latency *write;
 	struct ceph_metric_metadata_latency *meta;
 	struct ceph_metric_dlease *dlease;
+	struct ceph_opened_files *files;
+	struct ceph_pinned_icaps *icaps;
+	struct ceph_opened_inodes *inodes;
 	struct ceph_client_metric *m = &mdsc->metric;
 	u64 nr_caps = atomic64_read(&m->total_caps);
 	struct ceph_msg *msg;
@@ -26,7 +29,8 @@  static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
 	s32 len;
 
 	len = sizeof(*head) + sizeof(*cap) + sizeof(*read) + sizeof(*write)
-	      + sizeof(*meta) + sizeof(*dlease);
+	      + sizeof(*meta) + sizeof(*dlease) + sizeof(*files)
+	      + sizeof(*icaps) + sizeof(*inodes);
 
 	msg = ceph_msg_new(CEPH_MSG_CLIENT_METRICS, len, GFP_NOFS, true);
 	if (!msg) {
@@ -95,6 +99,38 @@  static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
 	dlease->total = cpu_to_le64(atomic64_read(&m->total_dentries));
 	items++;
 
+	sum = percpu_counter_sum(&m->total_inodes);
+
+	/* encode the opened files metric */
+	files = (struct ceph_opened_files *)(dlease + 1);
+	files->type = cpu_to_le32(CLIENT_METRIC_TYPE_OPENED_FILES);
+	files->ver = 1;
+	files->compat = 1;
+	files->data_len = cpu_to_le32(sizeof(*files) - 10);
+	files->opened_files = cpu_to_le64(atomic64_read(&m->opened_files));
+	files->total = cpu_to_le64(sum);
+	items++;
+
+	/* encode the pinned icaps metric */
+	icaps = (struct ceph_pinned_icaps *)(files + 1);
+	icaps->type = cpu_to_le32(CLIENT_METRIC_TYPE_PINNED_ICAPS);
+	icaps->ver = 1;
+	icaps->compat = 1;
+	icaps->data_len = cpu_to_le32(sizeof(*icaps) - 10);
+	icaps->pinned_icaps = cpu_to_le64(nr_caps);
+	icaps->total = cpu_to_le64(sum);
+	items++;
+
+	/* encode the opened inodes metric */
+	inodes = (struct ceph_opened_inodes *)(icaps + 1);
+	inodes->type = cpu_to_le32(CLIENT_METRIC_TYPE_OPENED_INODES);
+	inodes->ver = 1;
+	inodes->compat = 1;
+	inodes->data_len = cpu_to_le32(sizeof(*inodes) - 10);
+	inodes->opened_inodes = cpu_to_le64(percpu_counter_sum(&m->opened_inodes));
+	inodes->total = cpu_to_le64(sum);
+	items++;
+
 	put_unaligned_le32(items, &head->num);
 	msg->front.iov_len = len;
 	msg->hdr.version = cpu_to_le16(1);
diff --git a/fs/ceph/metric.h b/fs/ceph/metric.h
index af6038ff39d4..4ceb462135d7 100644
--- a/fs/ceph/metric.h
+++ b/fs/ceph/metric.h
@@ -14,8 +14,11 @@  enum ceph_metric_type {
 	CLIENT_METRIC_TYPE_WRITE_LATENCY,
 	CLIENT_METRIC_TYPE_METADATA_LATENCY,
 	CLIENT_METRIC_TYPE_DENTRY_LEASE,
+	CLIENT_METRIC_TYPE_OPENED_FILES,
+	CLIENT_METRIC_TYPE_PINNED_ICAPS,
+	CLIENT_METRIC_TYPE_OPENED_INODES,
 
-	CLIENT_METRIC_TYPE_MAX = CLIENT_METRIC_TYPE_DENTRY_LEASE,
+	CLIENT_METRIC_TYPE_MAX = CLIENT_METRIC_TYPE_OPENED_INODES,
 };
 
 /*
@@ -28,6 +31,9 @@  enum ceph_metric_type {
 	CLIENT_METRIC_TYPE_WRITE_LATENCY,	\
 	CLIENT_METRIC_TYPE_METADATA_LATENCY,	\
 	CLIENT_METRIC_TYPE_DENTRY_LEASE,	\
+	CLIENT_METRIC_TYPE_OPENED_FILES,	\
+	CLIENT_METRIC_TYPE_PINNED_ICAPS,	\
+	CLIENT_METRIC_TYPE_OPENED_INODES,	\
 						\
 	CLIENT_METRIC_TYPE_MAX,			\
 }
@@ -94,6 +100,42 @@  struct ceph_metric_dlease {
 	__le64 total;
 } __packed;
 
+/* metric opened files header */
+struct ceph_opened_files {
+	__le32 type;     /* ceph metric type */
+
+	__u8  ver;
+	__u8  compat;
+
+	__le32 data_len; /* length of sizeof(opened_files + total) */
+	__le64 opened_files;
+	__le64 total;
+} __packed;
+
+/* metric pinned i_caps header */
+struct ceph_pinned_icaps {
+	__le32 type;     /* ceph metric type */
+
+	__u8  ver;
+	__u8  compat;
+
+	__le32 data_len; /* length of sizeof(pinned_icaps + total) */
+	__le64 pinned_icaps;
+	__le64 total;
+} __packed;
+
+/* metric opened inodes header */
+struct ceph_opened_inodes {
+	__le32 type;     /* ceph metric type */
+
+	__u8  ver;
+	__u8  compat;
+
+	__le32 data_len; /* length of sizeof(opened_inodes + total) */
+	__le64 opened_inodes;
+	__le64 total;
+} __packed;
+
 struct ceph_metric_head {
 	__le32 num;	/* the number of metrics that will be sent */
 } __packed;