linux-kernel - [PATCH 3.19.y-ckt 020/170] ceph: fix request time stamp encoding

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Message-Id: <1459558456-24452-21-git-send-email-kamal@canonical.com>
Date:	Fri,  1 Apr 2016 17:51:46 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Yan@...nce.com, Zheng <zyan@...hat.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 020/170] ceph: fix request time stamp encoding

3.19.8-ckt18 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: "Yan, Zheng" <zyan@...hat.com>

commit 1f041a89b4f22cf2e701514f4b8f73a8b1e06a3e upstream.

struct timespec uses 'long' to present second and nanosecond. 'long'
is 64 bits on 64bits machine. ceph MDS expects time stamp to be
encoded as struct ceph_timespec, which uses 'u32' to present second
and nanosecond.

Signed-off-by: Yan, Zheng <zyan@...hat.com>
BugLink: http://tracker.ceph.com/issues/15302
BugLink: http://bugs.launchpad.net/bugs/1564950
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 fs/ceph/mds_client.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 611aa90..15e4b4f 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1923,7 +1923,11 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
 	head->num_releases = cpu_to_le16(releases);
 
 	/* time stamp */
-	ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp));
+	{
+		struct ceph_timespec ts;
+		ceph_encode_timespec(&ts, &req->r_stamp);
+		ceph_encode_copy(&p, &ts, sizeof(ts));
+	}
 
 	BUG_ON(p > end);
 	msg->front.iov_len = p - msg->front.iov_base;
@@ -2012,7 +2016,11 @@ static int __prepare_send_request(struct ceph_mds_client *mdsc,
 
 		/* time stamp */
 		p = msg->front.iov_base + req->r_request_release_offset;
-		ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp));
+		{
+			struct ceph_timespec ts;
+			ceph_encode_timespec(&ts, &req->r_stamp);
+			ceph_encode_copy(&p, &ts, sizeof(ts));
+		}
 
 		msg->front.iov_len = p - msg->front.iov_base;
 		msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
-- 
2.7.4