mnt: Renames around roots yard

Same thing as in previous patch -- we have too many generic
clean_ and fini_ prefixes over the code. And we need more (see
next patch), so let's specify what exactly we clean or fini.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-restore.c

@@ -1537,7 +1537,7 @@ static int restore_task_with_children(void *_arg)
 	if (restore_finish_stage(CR_STATE_FORKING) < 0)
 		goto err_fini_mnt;
 
-	if (current->parent == NULL && fini_mnt_ns())
+	if (current->parent == NULL && depopulate_roots_yard())
 		goto err;
 
 	if (restore_one_task(current->pid.virt, ca->core))
@@ -1547,7 +1547,7 @@ static int restore_task_with_children(void *_arg)
 
 err_fini_mnt:
 	if (current->parent == NULL)
-		fini_mnt_ns();
+		depopulate_roots_yard();
 
 err:
 	if (current->parent == NULL)

include/mount.h

@@ -113,7 +113,7 @@ extern bool phys_stat_dev_match(dev_t st_dev, dev_t phys_dev,
 				struct ns_id *, const char *path);
 
 extern int restore_task_mnt_ns(struct pstree_item *current);
-extern int fini_mnt_ns(void);
+extern int depopulate_roots_yard(void);
 
 extern char *rst_get_mnt_root(int mnt_id);
 extern int ext_mount_add(char *key, char *val);

mount.c

@@ -2644,7 +2644,7 @@ int restore_task_mnt_ns(struct pstree_item *current)
 /*
  * All nested mount namespaces are restore as sub-trees of the root namespace.
  */
-static int prepare_roots_yard(void)
+static int populate_roots_yard(void)
 {
 	char path[PATH_MAX];
 	struct ns_id *nsid;
@@ -2707,13 +2707,13 @@ static int populate_mnt_ns(void)
 	if (do_mount_root(pms))
 		return -1;
 
-	if (prepare_roots_yard())
+	if (populate_roots_yard())
 		return -1;
 
 	return mnt_tree_for_each(pms, do_mount_one);
 }
 
-int fini_mnt_ns(void)
+int depopulate_roots_yard(void)
 {
 	int ret = 0;