- mark_t mark; ///< Marker used to keep trace of free/used pages.
- pgoff_t pgoff; ///< Page offset inside file.
- fill_t fill:FILLSIZE; ///< Filled bytes in page.
- seq_t seq:2; ///< bit[1:0]: Page sequence number; bit[7:2] unused for now, must be set to 1.
- inode_t inode; ///< File inode (file identifier).
- fsc_t fsc; ///< FSC of the page header.
+ inode_t inode; ///< File inode (file identifier).
+ seq_t seq; ///< Page sequence number.
+ mark_t mark; ///< Marker used to keep trace of free/used pages.
+ pgoff_t pgoff; ///< Page offset inside file.
+ fill_t fill; ///< Filled bytes in page.
+ uint16_t rfu; ///< Reserved for future use, 0xFFFF for now.
+
+ /**
+ * FCS (Frame Check Sequence) of the page header.
+ * \note This field must be the last one!
+ * This is needed because if the page is only partially
+ * written, we can use this to detect it.
+ */
+ fcs_t fcs;