UBIFS: create the name of the background thread in every case

[pandora-kernel.git] / fs / lockd / mon.c

diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 908b23f..e4d5635 100644 (file)
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -18,6 +18,8 @@
 
 #define NLMDBG_FACILITY                NLMDBG_MONITOR
 
+#define XDR_ADDRBUF_LEN                (20)
+
 static struct rpc_clnt *       nsm_create(void);
 
 static struct rpc_program      nsm_program;
@@ -147,28 +149,55 @@ 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_common(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
+static __be32 *xdr_encode_nsm_string(__be32 *p, char *string)
 {
-       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));
+       size_t len = strlen(string);
+
+       if (len > SM_MAXSTRLEN)
+               len = SM_MAXSTRLEN;
+       return xdr_encode_opaque(p, string, len);
+}
+
+/*
+ * "mon_name" specifies the host to be monitored.
+ *
+ * Linux uses a text version of the IP address of the remote
+ * host as the host identifier (the "mon_name" argument).
+ *
+ * Linux statd always looks up the canonical hostname first for
+ * whatever remote hostname it receives, so this works alright.
+ */
+static __be32 *xdr_encode_mon_name(__be32 *p, struct nsm_args *argp)
+{
+       char    buffer[XDR_ADDRBUF_LEN + 1];
+       char    *name = argp->mon_name;
+
+       if (!nsm_use_hostnames) {
+               snprintf(buffer, XDR_ADDRBUF_LEN,
+                        NIPQUAD_FMT, NIPQUAD(argp->addr));
                name = buffer;
        }
-       if (!(p = xdr_encode_string(p, name))
-        || !(p = xdr_encode_string(p, utsname()->nodename)))
+
+       return xdr_encode_nsm_string(p, name);
+}
+
+/*
+ * The "my_id" argument specifies the hostname and RPC procedure
+ * to be called when the status manager receives notification
+ * (via the SM_NOTIFY call) that the state of host "mon_name"
+ * has changed.
+ */
+static __be32 *xdr_encode_my_id(__be32 *p, struct nsm_args *argp)
+{
+       p = xdr_encode_nsm_string(p, utsname()->nodename);
+       if (!p)
                return ERR_PTR(-EIO);
+
        *p++ = htonl(argp->prog);
        *p++ = htonl(argp->vers);
        *p++ = htonl(argp->proc);
@@ -176,18 +205,48 @@ xdr_encode_common(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
        return p;
 }
 
-static int
-xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
+/*
+ * The "mon_id" argument specifies the non-private arguments
+ * of an SM_MON or SM_UNMON call.
+ */
+static __be32 *xdr_encode_mon_id(__be32 *p, struct nsm_args *argp)
 {
-       p = xdr_encode_common(rqstp, p, argp);
-       if (IS_ERR(p))
-               return PTR_ERR(p);
+       p = xdr_encode_mon_name(p, argp);
+       if (!p)
+               return ERR_PTR(-EIO);
 
-       /* Surprise - there may even be room for an IPv6 address now */
+       return xdr_encode_my_id(p, argp);
+}
+
+/*
+ * The "priv" argument may contain private information required
+ * by the SM_MON call. This information will be supplied in the
+ * SM_NOTIFY call.
+ *
+ * Linux provides the raw IP address of the monitored host,
+ * left in network byte order.
+ */
+static __be32 *xdr_encode_priv(__be32 *p, struct nsm_args *argp)
+{
        *p++ = argp->addr;
        *p++ = 0;
        *p++ = 0;
        *p++ = 0;
+
+       return p;
+}
+
+static int
+xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
+{
+       p = xdr_encode_mon_id(p, argp);
+       if (IS_ERR(p))
+               return PTR_ERR(p);
+
+       p = xdr_encode_priv(p, argp);
+       if (IS_ERR(p))
+               return PTR_ERR(p);
+
        rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
        return 0;
 }
@@ -195,7 +254,7 @@ 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);
@@ -220,9 +279,11 @@ 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_mon_sz      (SM_mon_id_sz+4)
+#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_priv_sz     (XDR_QUADLEN(SM_PRIV_SIZE))
+#define SM_mon_sz      (SM_mon_id_sz+SM_priv_sz)
 #define SM_monres_sz   2
 #define SM_unmonres_sz 1