cleanup: save 60 lines/100 bytes by combining two mostly duplicate functions.

Eliminate two mostly duplicate functions (nfs_parse_simple_hostname()
and nfs_parse_protected_hostname()) and instead just make the calling
function (nfs_parse_devname()) do everything.
Signed-off-by: Rob Landley <rlandley@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/super.c

@@ -1665,99 +1665,59 @@ static int nfs_try_mount(struct nfs_parsed_mount_data *args,
 	return nfs_walk_authlist(args, &request);
 }
 
-static int nfs_parse_simple_hostname(const char *dev_name,
+/*
+ * Split "dev_name" into "hostname:export_path".
+ *
+ * The leftmost colon demarks the split between the server's hostname
+ * and the export path.  If the hostname starts with a left square
+ * bracket, then it may contain colons.
+ *
+ * Note: caller frees hostname and export path, even on error.
+ */
+static int nfs_parse_devname(const char *dev_name,
 			     char **hostname, size_t maxnamlen,
 			     char **export_path, size_t maxpathlen)
 {
 	size_t len;
-	char *colon, *comma;
+	char *end;
 
-	colon = strchr(dev_name, ':');
-	if (colon == NULL)
+	/* Is the host name protected with square brakcets? */
+	if (*dev_name == '[') {
+		end = strchr(++dev_name, ']');
+		if (end == NULL || end[1] != ':')
 			goto out_bad_devname;
 
-	len = colon - dev_name;
-	if (len > maxnamlen)
-		goto out_hostname;
+		len = end - dev_name;
+		end++;
+	} else {
+		char *comma;
 
-	/* N.B. caller will free nfs_server.hostname in all cases */
-	*hostname = kstrndup(dev_name, len, GFP_KERNEL);
-	if (!*hostname)
-		goto out_nomem;
+		end = strchr(dev_name, ':');
+		if (end == NULL)
+			goto out_bad_devname;
+		len = end - dev_name;
 
 		/* kill possible hostname list: not supported */
-	comma = strchr(*hostname, ',');
-	if (comma != NULL) {
-		if (comma == *hostname)
-			goto out_bad_devname;
-		*comma = '\0';
+		comma = strchr(dev_name, ',');
+		if (comma != NULL && comma < end)
+			*comma = 0;
 	}
 
-	colon++;
-	len = strlen(colon);
-	if (len > maxpathlen)
-		goto out_path;
-	*export_path = kstrndup(colon, len, GFP_KERNEL);
-	if (!*export_path)
-		goto out_nomem;
-
-	dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
-	return 0;
-
-out_bad_devname:
-	dfprintk(MOUNT, "NFS: device name not in host:path format\n");
-	return -EINVAL;
-
-out_nomem:
-	dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
-	return -ENOMEM;
-
-out_hostname:
-	dfprintk(MOUNT, "NFS: server hostname too long\n");
-	return -ENAMETOOLONG;
-
-out_path:
-	dfprintk(MOUNT, "NFS: export pathname too long\n");
-	return -ENAMETOOLONG;
-}
-
-/*
- * Hostname has square brackets around it because it contains one or
- * more colons.  We look for the first closing square bracket, and a
- * colon must follow it.
- */
-static int nfs_parse_protected_hostname(const char *dev_name,
-					char **hostname, size_t maxnamlen,
-					char **export_path, size_t maxpathlen)
-{
-	size_t len;
-	char *start, *end;
-
-	start = (char *)(dev_name + 1);
-
-	end = strchr(start, ']');
-	if (end == NULL)
-		goto out_bad_devname;
-	if (*(end + 1) != ':')
-		goto out_bad_devname;
-
-	len = end - start;
 	if (len > maxnamlen)
 		goto out_hostname;
 
 	/* N.B. caller will free nfs_server.hostname in all cases */
-	*hostname = kstrndup(start, len, GFP_KERNEL);
+	*hostname = kstrndup(dev_name, len, GFP_KERNEL);
 	if (*hostname == NULL)
 		goto out_nomem;
-
-	end += 2;
-	len = strlen(end);
+	len = strlen(++end);
 	if (len > maxpathlen)
 		goto out_path;
 	*export_path = kstrndup(end, len, GFP_KERNEL);
 	if (!*export_path)
 		goto out_nomem;
 
+	dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
 	return 0;
 
 out_bad_devname:
@@ -1777,29 +1737,6 @@ static int nfs_parse_protected_hostname(const char *dev_name,
 	return -ENAMETOOLONG;
 }
 
-/*
- * Split "dev_name" into "hostname:export_path".
- *
- * The leftmost colon demarks the split between the server's hostname
- * and the export path.  If the hostname starts with a left square
- * bracket, then it may contain colons.
- *
- * Note: caller frees hostname and export path, even on error.
- */
-static int nfs_parse_devname(const char *dev_name,
-			     char **hostname, size_t maxnamlen,
-			     char **export_path, size_t maxpathlen)
-{
-	if (*dev_name == '[')
-		return nfs_parse_protected_hostname(dev_name,
-						    hostname, maxnamlen,
-						    export_path, maxpathlen);
-
-	return nfs_parse_simple_hostname(dev_name,
-					 hostname, maxnamlen,
-					 export_path, maxpathlen);
-}
-
 /*
  * Validate the NFS2/NFS3 mount data
  * - fills in the mount root filehandle