increment the refcount to the parent dir when creating a child work item

Author: bertschinger

include/bf.h

@@ -336,6 +336,7 @@ struct dir_rc {
 struct dir_rc *open_dir_rc(int optional_fd, char *path);
 int get_dir_fd(struct dir_rc *dir);
 void dir_inc(struct dir_rc *dir);
+struct dir_rc *dir_clone(struct dir_rc *dir);
 void dir_dec(struct dir_rc *dir);
 
 /*

src/bf.c

@@ -626,6 +626,15 @@ void dir_inc(struct dir_rc *dir) {
     __atomic_fetch_add(&dir->rc, 1, __ATOMIC_ACQ_REL);
 }
 
+/*
+ * Clone a `dir_rc`.
+ * This increments the refcount and returns a pointer to the dir_rc to the caller.
+ */
+struct dir_rc *dir_clone(struct dir_rc *dir) {
+    dir_inc(dir);
+    return dir;
+}
+
 /*
  * Decrement the reference count for a dir_rc, and free it if that was the last reference.
  */

src/descend.c

@@ -127,6 +127,7 @@ int descend(QPTPool_t *ctx, const size_t id, void *args,
             }
 
             struct work *child = new_work_with_name(work->name, work->name_len, dir_child->d_name, len);
+            child->parent_dir = dir_clone(d_rc);
 
             struct entry_data child_ed;
             memset(&child_ed, 0, sizeof(child_ed));