X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Kernel%2Finclude%2Fvfs.h;h=40c611bcc801eb3ffc4953ded913f081dbb1061d;hb=0b24cbc2f18942b3d1d74efa025ecfa318ab35ec;hp=f13f1b693888b865ae522249227b40e78f672f94;hpb=4d498b090274b87befa5652589e0aa54b2b6fe0a;p=tpg%2Facess2.git

diff --git a/Kernel/include/vfs.h b/Kernel/include/vfs.h
index f13f1b69..40c611bc 100644
--- 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
 /**
  * \}
  */
@@ -85,7 +94,7 @@ typedef struct sVFS_Node
 	 *        corresponds to.
 	 * \{
 	 */
-	Uint64	Inode;	//!< Inode ID (Essentially another ImplInt)
+	Uint64	Inode;	//!< Inode ID - Must identify the node uniquely if tVFS_Driver.GetNodeFromINode is non-NULL
 	Uint	ImplInt;	//!< Implementation Usable Integer
 	void	*ImplPtr;	//!< Implementation Usable Pointer
 	/**
@@ -146,6 +155,7 @@ typedef struct sVFS_Node
 	
 	/**
 	 * \name VFS_Select() fields
+	 * \note Used by the VFS internals, drivers should use VFS_Mark*
 	 * \{
 	 */
 	 int	DataAvaliable;
@@ -157,6 +167,15 @@ typedef struct sVFS_Node
 	/**
 	 * \}
 	 */
+
+	/**
+	 * \name VFS_MMap() fields
+	 * \{
+	 */
+	void	*MMapInfo;
+	/**
+	 * \}
+	 */
 	
 	/**
 	 * \name Common Functions
@@ -215,6 +234,17 @@ 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);
 	
 	/**
 	 * \}
@@ -283,16 +313,30 @@ typedef struct sVFS_Node
  */
 typedef struct sVFS_Driver
 {
-	//! \brief Unique Identifier for this filesystem type
+	/**
+	 * \brief Unique Identifier for this filesystem type
+	 */
 	const char	*Name;
-	//! \brief Flags applying to this driver
+	/**
+	 * \brief Flags applying to this driver
+	 */
 	Uint	Flags;
 	
-	//! \brief Callback to mount a device
+	/**
+	 * \brief Callback to mount a device
+	 */
 	tVFS_Node	*(*InitDevice)(const char *Device, const char **Options);
-	//! \brief Callback to unmount a device
+	/**
+	 * \brief Callback to unmount a device
+	 */
 	void	(*Unmount)(tVFS_Node *Node);
-	//! \brief Used internally (next driver in the chain)
+	/**
+	 * \brief Retrieve a VFS node from an inode
+	 */
+	tVFS_Node	*(*GetNodeFromINode)(tVFS_Node *RootNode, Uint64 InodeValue);
+	/**
+	 * \brief Used internally (next driver in the chain)
+	 */
 	struct sVFS_Driver	*Next;
 } tVFS_Driver;