[PATCH v2] ceph: only send metrics when the MDS rank is ready

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From: Xiubo Li <xiubli@xxxxxxxxxx>

When the MDS rank is in clientreplay state, the metrics requests
will be discarded directly. Also, when there are a lot of known
client requests to recover from, the metrics requests will slow
down the MDS rank from getting to the active state sooner.

With this patch, we will send the metrics requests only when the
MDS rank is in active state.

URL: https://tracker.ceph.com/issues/61524
Reviewed-by: Milind Changire <mchangir@xxxxxxxxxx>
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
---

V2:
- rephrase the commit comment from Milind's comments.


 fs/ceph/metric.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/ceph/metric.c b/fs/ceph/metric.c
index c47347d2e84e..cce78d769f55 100644
--- a/fs/ceph/metric.c
+++ b/fs/ceph/metric.c
@@ -36,6 +36,14 @@ static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
 	s32 items = 0;
 	s32 len;
 
+	/* Do not send the metrics until the MDS rank is ready */
+	mutex_lock(&mdsc->mutex);
+	if (ceph_mdsmap_get_state(mdsc->mdsmap, s->s_mds) != CEPH_MDS_STATE_ACTIVE) {
+		mutex_unlock(&mdsc->mutex);
+		return false;
+	}
+	mutex_unlock(&mdsc->mutex);
+
 	len = sizeof(*head) + sizeof(*cap) + sizeof(*read) + sizeof(*write)
 	      + sizeof(*meta) + sizeof(*dlease) + sizeof(*files)
 	      + sizeof(*icaps) + sizeof(*inodes) + sizeof(*rsize)
-- 
2.40.1




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