ceph: message versioning fixes

There were two places we were assigning version in host byte order
instead of network byte order.

Also in MSG_CLIENT_SESSION we weren't setting compat_version in the
header to reflect continued compatability with older MDSs.

Fixes: http://tracker.ceph.com/issues/9945

Signed-off-by: John Spray <john.spray@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 9f00853f6d42..387a48993d34 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -860,8 +860,11 @@ static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u6
         /*
          * Serialize client metadata into waiting buffer space, using
          * the format that userspace expects for map<string, string>
+         *
+         * ClientSession messages with metadata are v2
          */
-        msg->hdr.version = 2;  /* ClientSession messages with metadata are v2 */
+        msg->hdr.version = cpu_to_le16(2);
+        msg->hdr.compat_version = cpu_to_le16(1);
 
         /* The write pointer, following the session_head structure */
         p = msg->front.iov_base + sizeof(*h);
@@ -1872,7 +1875,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
                 goto out_free2;
         }
 
-        msg->hdr.version = 2;
+        msg->hdr.version = cpu_to_le16(2);
         msg->hdr.tid = cpu_to_le64(req->r_tid);
 
         head = msg->front.iov_base;