Pastos.

[bertos.git] / fs / battfs.h

diff --git a/fs/battfs.h b/fs/battfs.h
index 455b21ce0c20c1a6e4bd521a5281936e6a714048..14728a8d2b199f82c36054fa9237bbdb1bc5904a 100644 (file)
--- a/fs/battfs.h
+++ b/fs/battfs.h
@@ -75,15 +75,21 @@ typedef struct BattFsPageHeader
         */
        fcs_t fcs;
 } BattFsPageHeader;
+/* Ensure structure has no padding added */
+STATIC_ASSERT(sizeof(BattFsPageHeader) == 12);
+
+
+/**
+ * Mark for valid pages.
+ * Simply set to 1 all field bits.
+ */
+#define MARK_PAGE_VALID ((1 << (CPU_BITS_PER_CHAR * sizeof(mark_t))) - 1)
 
 /**
  * Max number of files.
  */
 #define BATTFS_MAX_FILES (1 << (CPU_BITS_PER_CHAR * sizeof(inode_t)))
 
-/* Ensure structure has no padding added */
-STATIC_ASSERT(sizeof(BattFsPageHeader) == 12);
-
 /* Fwd decl */
 struct BattFsSuper;
 
@@ -92,6 +98,11 @@ struct BattFsSuper;
  */
 typedef uint16_t pgcnt_t;
 
+/**
+ * Sentinel used to keep trace of unset pages in disk->pag_array.
+ */
+#define PAGE_UNSET_SENTINEL ((1 << (CPU_BITS_PER_CHAR * sizeof(pgcnt_t))) - 1)
+
 /**
  * Type interface for disk init function.
  * \return true if all is ok, false otherwise.
@@ -153,7 +164,10 @@ typedef struct BattFsSuper
         * Is used by the filesystem to represent
         * the entire disk in memory.
         */
-       pgcnt_t *page_array;     
+       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).
        disk_size_t free_bytes;  ///< Free space on the disk.