Kernel - VFS mmap spec (Node level)

diff --git a/Kernel/include/vfs.h b/Kernel/include/vfs.h
index f13f1b6..248a1ac 100644 (file)
--- a/Kernel/include/vfs.h
+++ b/Kernel/include/vfs.h
@@ -67,6 +67,15 @@ typedef struct sVFS_SelectList       tVFS_SelectList;
  * inherit the GID of the parent.
  */
 #define VFS_FFLAG_SETGID       0x10
+
+/**
+ * \brief "Don't do Write-Back" Flag
+ *
+ * Stops the VFS from calling tVFS_Node.Write on dirty pages when a region
+ * is unmapped. Nice for read-only files and memory-only files (or 
+ * pseudo-readonly filesystems)
+ */
+#define VFS_FFLAG_NOWRITEBACK
 /**
  * \}
  */
@@ -215,6 +224,17 @@ typedef struct sVFS_Node
         * \return Number of bytes read
         */
        Uint64  (*Write)(struct sVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
+
+       /**
+        * \brief Map a region of a file into memory
+        * \param Node  Pointer to this node
+        * \param Offset        Start of the region (page aligned)
+        * \param Length        Length of the region (page aligned)
+        * \param Dest  Location to which to map
+        * \return Boolean Failure
+        * \note If NULL, the VFS implements it using .Read
+        */
+        int    (*MMap)(struct sVFS_Node *Node, Uint64 Offset, int Length, void *Dest);
        
        /**
         * \}