init: split get_fs_names

Split get_fs_names into one function that splits up the command line
argument, and one that gets the list of all registered file systems.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

init/do_mounts.c

@@ -338,30 +338,31 @@ __setup("rootflags=", root_data_setup);
 __setup("rootfstype=", fs_names_setup);
 __setup("rootdelay=", root_delay_setup);
 
-static void __init get_fs_names(char *page)
+static void __init split_fs_names(char *page, char *names)
 {
-	char *s = page;
+	strcpy(page, root_fs_names);
-
+	while (*page++) {
-	if (root_fs_names) {
+		if (page[-1] == ',')
-		strcpy(page, root_fs_names);
+			page[-1] = '\0';
-		while (*s++) {
-			if (s[-1] == ',')
-				s[-1] = '\0';
-		}
-	} else {
-		int len = get_filesystem_list(page);
-		char *p, *next;
-
-		page[len] = '\0';
-		for (p = page-1; p; p = next) {
-			next = strchr(++p, '\n');
-			if (*p++ != '\t')
-				continue;
-			while ((*s++ = *p++) != '\n')
-				;
-			s[-1] = '\0';
-		}
 	}
+	*page = '\0';
+}
+
+static void __init get_all_fs_names(char *page)
+{
+	int len = get_filesystem_list(page);
+	char *s = page, *p, *next;
+
+	page[len] = '\0';
+	for (p = page - 1; p; p = next) {
+		next = strchr(++p, '\n');
+		if (*p++ != '\t')
+			continue;
+		while ((*s++ = *p++) != '\n')
+			;
+		s[-1] = '\0';
+	}
+
 	*s = '\0';
 }
 
@@ -411,7 +412,10 @@ void __init mount_block_root(char *name, int flags)
 
 	scnprintf(b, BDEVNAME_SIZE, "unknown-block(%u,%u)",
 		  MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
-	get_fs_names(fs_names);
+	if (root_fs_names)
+		split_fs_names(fs_names, root_fs_names);
+	else
+		get_all_fs_names(fs_names);
 retry:
 	for (p = fs_names; *p; p += strlen(p)+1) {
 		int err = do_mount_root(name, p, flags, root_mount_data);