lockd: Fix up incorrect RPC buffer size calculations.

Switch to using the new mon_id encoder function.

Now that we've refactored the encoding of SM_MON requests, we've
discovered that the pre-computed buffer length maximums are
incorrect!

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 8 insertions, 31 deletions

diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 3935d7b604f5..f2507fec7c6f 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -149,6 +149,9 @@ nsm_create(void)
 
 /*
  * XDR functions for NSM.
+ *
+ * See http://www.opengroup.org/ for details on the Network
+ * Status Monitor wire protocol.
  */
 
 static __be32 *xdr_encode_nsm_string(__be32 *p, char *string)
@@ -215,37 +218,10 @@ static __be32 *xdr_encode_mon_id(__be32 *p, struct nsm_args *argp)
         return xdr_encode_my_id(p, argp);
 }
 
-static __be32 *
-xdr_encode_common(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
-{
-        char    buffer[20], *name;
-
-        /*
-         * Use the dotted-quad IP address of the remote host as
-         * identifier. Linux statd always looks up the canonical
-         * hostname first for whatever remote hostname it receives,
-         * so this works alright.
-         */
-        if (nsm_use_hostnames) {
-                name = argp->mon_name;
-        } else {
-                sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr));
-                name = buffer;
-        }
-        if (!(p = xdr_encode_string(p, name))
-         || !(p = xdr_encode_string(p, utsname()->nodename)))
-                return ERR_PTR(-EIO);
-        *p++ = htonl(argp->prog);
-        *p++ = htonl(argp->vers);
-        *p++ = htonl(argp->proc);
-
-        return p;
-}
-
 static int
 xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
 {
-        p = xdr_encode_common(rqstp, p, argp);
+        p = xdr_encode_mon_id(p, argp);
         if (IS_ERR(p))
                 return PTR_ERR(p);
 
@@ -261,7 +237,7 @@ xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
 static int
 xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
 {
-        p = xdr_encode_common(rqstp, p, argp);
+        p = xdr_encode_mon_id(p, argp);
         if (IS_ERR(p))
                 return PTR_ERR(p);
         rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
@@ -286,8 +262,9 @@ xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
 }
 
 #define SM_my_name_sz   (1+XDR_QUADLEN(SM_MAXSTRLEN))
-#define SM_my_id_sz     (3+1+SM_my_name_sz)
-#define SM_mon_id_sz    (1+XDR_QUADLEN(20)+SM_my_id_sz)
+#define SM_my_id_sz     (SM_my_name_sz+3)
+#define SM_mon_name_sz  (1+XDR_QUADLEN(SM_MAXSTRLEN))
+#define SM_mon_id_sz    (SM_mon_name_sz+SM_my_id_sz)
 #define SM_mon_sz       (SM_mon_id_sz+4)
 #define SM_monres_sz    2
 #define SM_unmonres_sz  1