+ /**
+ * Page allocation array.
+ * This array must be allocated somewhere and
+ * must have enough space for page_count elements.
+ * Is used by the filesystem to represent
+ * the entire disk in memory.
+ */
+ pgcnt_t *page_array;
+
+ mark_t min_free; ///< Lowest sequence number of free page
+ mark_t max_free; ///< Highest sequence number of free page
+
+ disk_size_t disk_size; ///< Size of the disk, in bytes (page_count * page_size).