X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=KernelLand%2FModules%2FFilesystems%2FFAT%2Fcommon.h;fp=KernelLand%2FModules%2FFilesystems%2FFAT%2Fcommon.h;h=340fff081f1eed00144c08b1852981f79ac40224;hb=17be74ac4510cfe4962b1423e70c3b3a0333102f;hp=0000000000000000000000000000000000000000;hpb=a3228edcd7ab931cd433537f51b0359b67a8fe2a;p=tpg%2Facess2.git

diff --git a/KernelLand/Modules/Filesystems/FAT/common.h b/KernelLand/Modules/Filesystems/FAT/common.h
new file mode 100644
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+++ b/KernelLand/Modules/Filesystems/FAT/common.h
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+/*
+ * Acess2 FAT Filesystem Driver
+ * - By John Hodge (thePowersGang)
+ * 
+ * common.h
+ * - FAT internal common header
+ */
+#ifndef _FS__FAT__COMMON_H_
+#define _FS__FAT__COMMON_H_
+
+#include "fs_fat.h"
+#include <vfs.h>
+
+#define CACHE_FAT	0	//!< Caches the FAT in memory
+#define USE_LFN		1	//!< Enables the use of Long File Names
+#define	SUPPORT_WRITE	1	//!< Enables write support
+
+#define FAT_FLAG_DIRTY	0x10000
+#define FAT_FLAG_DELETE	0x20000
+
+typedef struct sFAT_VolInfo tFAT_VolInfo;
+#if USE_LFN
+typedef struct sFAT_LFNCacheEnt	tFAT_LFNCacheEnt;
+typedef struct sFAT_LFNCache	tFAT_LFNCache;
+#endif
+typedef struct sFAT_CachedNode	tFAT_CachedNode;
+
+/**
+ * \brief Internal IDs for FAT types
+ */
+enum eFatType
+{
+	FAT12,	//!< FAT12 Volume
+	FAT16,	//!< FAT16 Volume
+	FAT32,	//!< FAT32 Volume
+};
+
+// === TYPES ===
+struct sFAT_VolInfo
+{
+	 int	fileHandle;	//!< File Handle
+	enum eFatType	type;	//!< FAT Variant
+	char	name[12];	//!< Volume Name (With NULL Terminator)
+	Uint32	firstDataSect;	//!< First data sector
+	Uint32	rootOffset;	//!< Root Offset (clusters)
+	Uint32	ClusterCount;	//!< Total Cluster Count
+	fat_bootsect	bootsect;	//!< Boot Sector
+	tVFS_Node	rootNode;	//!< Root Node
+	 int	BytesPerCluster;
+	
+	tMutex	lNodeCache;
+	tFAT_CachedNode	*NodeCache;
+	
+	tMutex	lFAT;   	//!< Lock to prevent double-writing to the FAT
+	#if CACHE_FAT
+	Uint32	*FATCache;	//!< FAT Cache
+	#endif
+};
+
+#if USE_LFN
+/**
+ * \brief Long-Filename cache entry
+ */
+struct sFAT_LFNCacheEnt
+{
+	 int	ID;
+	Uint16	Data[256];
+};
+/**
+ * \brief Long-Filename cache
+ */
+struct sFAT_LFNCache
+{
+	 int	NumEntries;
+	tFAT_LFNCacheEnt	Entries[];
+};
+#endif
+
+struct sFAT_CachedNode
+{
+	struct sFAT_CachedNode	*Next;
+	tVFS_Node	Node;
+};
+
+// --- General Helpers ---
+extern int	FAT_int_GetAddress(tVFS_Node *Node, Uint64 Offset, Uint64 *Addr, Uint32 *Cluster);
+
+// --- Node Caching ---
+// NOTE: FAT uses its own node cache that references by cluster (not the inode value that the Inode_* cache uses)
+//       because tVFS_Node.Inode contains the parent directory inode
+extern tVFS_Node	*FAT_int_CreateNode(tVFS_Node *Parent, fat_filetable *Entry);
+extern tVFS_Node	*FAT_int_CreateIncompleteDirNode(tFAT_VolInfo *Disk, Uint32 Cluster);
+extern tVFS_Node	*FAT_int_GetNode(tFAT_VolInfo *Disk, Uint32 Cluster);
+extern void	FAT_int_DerefNode(tVFS_Node *Node);
+extern void	FAT_int_ClearNodeCache(tFAT_VolInfo *Disk);
+
+// --- FAT Access ---
+extern Uint32	FAT_int_GetFatValue(tFAT_VolInfo *Disk, Uint32 Cluster);
+#if SUPPORT_WRITE
+extern Uint32	FAT_int_AllocateCluster(tFAT_VolInfo *Disk, Uint32 Previous);
+extern Uint32	FAT_int_FreeCluster(tFAT_VolInfo *Disk, Uint32 Cluster);
+#endif
+extern void	FAT_int_ReadCluster(tFAT_VolInfo *Disk, Uint32 Cluster, int Length, void *Buffer);
+extern void	FAT_int_WriteCluster(tFAT_VolInfo *Disk, Uint32 Cluster, const void *Buffer);
+
+// --- Directory Access ---
+extern char	*FAT_ReadDir(tVFS_Node *Node, int ID);
+extern tVFS_Node	*FAT_FindDir(tVFS_Node *Node, const char *Name);
+extern tVFS_Node	*FAT_GetNodeFromINode(tVFS_Node *Root, Uint64 Inode);
+extern int	FAT_int_GetEntryByCluster(tVFS_Node *DirNode, Uint32 Cluster, fat_filetable *Entry);
+#if SUPPORT_WRITE
+extern int	FAT_int_WriteDirEntry(tVFS_Node *Node, int ID, fat_filetable *Entry);
+extern int	FAT_Mknod(tVFS_Node *Node, const char *Name, Uint Flags);
+extern int	FAT_Link(tVFS_Node *DirNode, const char *NewName, tVFS_Node *Node);
+extern int	FAT_Unlink(tVFS_Node *DirNode, const char *OldName);
+#endif
+extern void	FAT_CloseFile(tVFS_Node *node);
+
+// === GLOBALS ===
+extern tVFS_NodeType	gFAT_DirType;
+extern tVFS_NodeType	gFAT_FileType;
+
+#endif
+