linux-kernel - [PATCH] net: ceph: Use CLOCK_MONOTONIC ktime_get

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Date:   Fri, 18 Jun 2021 22:27:40 +0800
From:   Yejune Deng <yejune.deng@...il.com>
To:     idryomov@...il.com, jlayton@...nel.org, davem@...emloft.net,
        kuba@...nel.org
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yejune Deng <yejune.deng@...il.com>
Subject: [PATCH] net: ceph: Use CLOCK_MONOTONIC ktime_get_ts64()

The Documentation/core-api/timekeeping.rst recommend that we should use
monotonic time ktime_get_ts64(), to avoid glitches with a concurrent
settimeofday().

Signed-off-by: Yejune Deng <yejune.deng@...il.com>
---
 net/ceph/messenger.c    | 2 +-
 net/ceph/messenger_v1.c | 2 +-
 net/ceph/messenger_v2.c | 2 +-
 net/ceph/osd_client.c   | 4 ++--
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 57d043b..2d07ab5 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -1809,7 +1809,7 @@ bool ceph_con_keepalive_expired(struct ceph_connection *con,
 	    (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2)) {
 		struct timespec64 now;
 		struct timespec64 ts;
-		ktime_get_real_ts64(&now);
+		ktime_get_ts64(&now);
 		jiffies_to_timespec64(interval, &ts);
 		ts = timespec64_add(con->last_keepalive_ack, ts);
 		return timespec64_compare(&now, &ts) >= 0;
diff --git a/net/ceph/messenger_v1.c b/net/ceph/messenger_v1.c
index 2cb5ffd..2ec7b1d 100644
--- a/net/ceph/messenger_v1.c
+++ b/net/ceph/messenger_v1.c
@@ -310,7 +310,7 @@ static void prepare_write_keepalive(struct ceph_connection *con)
 	if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) {
 		struct timespec64 now;
 
-		ktime_get_real_ts64(&now);
+		ktime_get_ts64(&now);
 		con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2);
 		ceph_encode_timespec64(&con->v1.out_temp_keepalive2, &now);
 		con_out_kvec_add(con, sizeof(con->v1.out_temp_keepalive2),
diff --git a/net/ceph/messenger_v2.c b/net/ceph/messenger_v2.c
index cc40ce4..2125e77 100644
--- a/net/ceph/messenger_v2.c
+++ b/net/ceph/messenger_v2.c
@@ -1439,7 +1439,7 @@ static int prepare_keepalive2(struct ceph_connection *con)
 	struct ceph_timespec *ts = CTRL_BODY(con->v2.out_buf);
 	struct timespec64 now;
 
-	ktime_get_real_ts64(&now);
+	ktime_get_ts64(&now);
 	dout("%s con %p timestamp %lld.%09ld\n", __func__, con, now.tv_sec,
 	     now.tv_nsec);
 
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index ff8624a..5192a8a 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -4717,7 +4717,7 @@ ceph_osdc_watch(struct ceph_osd_client *osdc,
 	ceph_oid_copy(&lreq->t.base_oid, oid);
 	ceph_oloc_copy(&lreq->t.base_oloc, oloc);
 	lreq->t.flags = CEPH_OSD_FLAG_WRITE;
-	ktime_get_real_ts64(&lreq->mtime);
+	ktime_get_ts64(&lreq->mtime);
 
 	lreq->reg_req = alloc_watch_request(lreq, CEPH_OSD_WATCH_OP_WATCH);
 	if (!lreq->reg_req) {
@@ -4767,7 +4767,7 @@ int ceph_osdc_unwatch(struct ceph_osd_client *osdc,
 	ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
 	ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
 	req->r_flags = CEPH_OSD_FLAG_WRITE;
-	ktime_get_real_ts64(&req->r_mtime);
+	ktime_get_ts64(&req->r_mtime);
 	osd_req_op_watch_init(req, 0, lreq->linger_id,
 			      CEPH_OSD_WATCH_OP_UNWATCH);
 
-- 
2.7.4