ceph: add version field to message header

This makes it easier for individual message types to indicate
their particular encoding, and make future changes backward
compatible.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/ceph/msgr.h b/fs/ceph/msgr.h
index 73921ae43faa..9abc879e25b1 100644
--- a/fs/ceph/msgr.h
+++ b/fs/ceph/msgr.h
@@ -21,7 +21,7 @@
  * whenever the wire protocol changes.  try to keep this string length
  * constant.
  */
-#define CEPH_BANNER "ceph v021"
+#define CEPH_BANNER "ceph v022"
 #define CEPH_BANNER_MAX_LEN 30
 
 
@@ -125,6 +125,7 @@ struct ceph_msg_header {
         __le64 seq;       /* message seq# for this session */
         __le16 type;      /* message type */
         __le16 priority;  /* priority.  higher value == higher priority */
+        __le16 version;   /* version of message encoding */
 
         __le32 front_len; /* bytes in main payload */
         __le32 middle_len;/* bytes in middle payload */