ceph: include type in ceph_entity_addr, filepath

Include a type/version in ceph_entity_addr and filepath.  Include extra
byte in filepath encoding as necessary.

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

fs/ceph/decode.h

@@ -138,6 +138,7 @@ static inline void ceph_encode_filepath(void **p, void *end,
 {
 	u32 len = path ? strlen(path) : 0;
 	BUG_ON(*p + sizeof(ino) + sizeof(len) + len > end);
+	ceph_encode_8(p, 1);
 	ceph_encode_64(p, ino);
 	ceph_encode_32(p, len);
 	if (len)

fs/ceph/mds_client.c

@@ -1325,7 +1325,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
 	}
 
 	len = sizeof(*head) +
-		pathlen1 + pathlen2 + 2*(sizeof(u32) + sizeof(u64));
+		pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
 
 	/* calculate (max) length for cap releases */
 	len += sizeof(struct ceph_mds_request_release) *

fs/ceph/messenger.c

@@ -1909,6 +1909,7 @@ struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr)
 		msgr->inst.addr = *myaddr;
 
 	/* select a random nonce */
+	msgr->inst.addr.type = 0;
 	get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
 	encode_my_addr(msgr);
 

fs/ceph/msgr.h

@@ -21,7 +21,7 @@
  * whenever the wire protocol changes.  try to keep this string length
  * constant.
  */
-#define CEPH_BANNER "ceph v026"
+#define CEPH_BANNER "ceph v027"
 #define CEPH_BANNER_MAX_LEN 30
 
 
@@ -61,7 +61,8 @@ extern const char *ceph_entity_type_name(int type);
  * entity_addr -- network address
  */
 struct ceph_entity_addr {
-	__le64 nonce;  /* unique id for process (e.g. pid) */
+	__le32 type;
+	__le32 nonce;  /* unique id for process (e.g. pid) */
 	struct sockaddr_storage in_addr;
 } __attribute__ ((packed));