vfat.h

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/* $Id: vfat.h 16656 2005-07-20 02:52:52Z ion $ */

#include <ddk/ntifs.h>
#include <ddk/ntdddisk.h>
#include <ndk/ntndk.h>
#include <reactos/helper.h>
#include <ccros.h>
#include <limits.h>
#include <debug.h>

#define USE_ROS_CC_AND_FS

#include <pshpack1.h>
struct _BootSector
{
  unsigned char  magic0, res0, magic1;
  unsigned char  OEMName[8];
  unsigned short BytesPerSector;
  unsigned char  SectorsPerCluster;
  unsigned short ReservedSectors;
  unsigned char  FATCount;
  unsigned short RootEntries, Sectors;
  unsigned char  Media;
  unsigned short FATSectors, SectorsPerTrack, Heads;
  unsigned long  HiddenSectors, SectorsHuge;
  unsigned char  Drive, Res1, Sig;
  unsigned long  VolumeID;
  unsigned char  VolumeLabel[11], SysType[8];
  unsigned char  Res2[448];
  unsigned short Signatur1;
};

struct _BootSector32
{
  unsigned char  magic0, res0, magic1;			// 0
  unsigned char  OEMName[8];				// 3
  unsigned short BytesPerSector;			// 11
  unsigned char  SectorsPerCluster;			// 13
  unsigned short ReservedSectors;			// 14
  unsigned char  FATCount;				// 16
  unsigned short RootEntries, Sectors;			// 17
  unsigned char  Media;					// 21
  unsigned short FATSectors, SectorsPerTrack, Heads;	// 22
  unsigned long  HiddenSectors, SectorsHuge;		// 28
  unsigned long  FATSectors32;				// 36
  unsigned short ExtFlag;				// 40
  unsigned short FSVersion;				// 42
  unsigned long  RootCluster;				// 44
  unsigned short FSInfoSector;				// 48
  unsigned short BootBackup;				// 50
  unsigned char  Res3[12];				// 52
  unsigned char  Drive;					// 64
  unsigned char  Res4;					// 65
  unsigned char  ExtBootSignature;			// 66
  unsigned long  VolumeID;				// 67
  unsigned char  VolumeLabel[11], SysType[8];		// 71
  unsigned char  Res2[420];				// 90
  unsigned short Signature1;				// 510
};

struct _BootSectorFatX
{
   unsigned char SysType[4];        // 0
   unsigned long VolumeID;          // 4
   unsigned long SectorsPerCluster; // 8
   unsigned short FATCount;         // 12
   unsigned long Unknown;           // 14
   unsigned char Unused[4078];      // 18
};

struct _FsInfoSector
{
  unsigned long  ExtBootSignature2;			// 0
  unsigned char  Res6[480];				// 4
  unsigned long  FSINFOSignature;			// 484
  unsigned long  FreeCluster;				// 488
  unsigned long  NextCluster;				// 492
  unsigned char  Res7[12];				// 496
  unsigned long  Signatur2;				// 508
};

typedef struct _BootSector BootSector;

struct _FATDirEntry
{
  union
  {
     struct { unsigned char Filename[8], Ext[3]; };
     unsigned char ShortName[11];
  };
  unsigned char  Attrib;
  unsigned char  lCase;
  unsigned char  CreationTimeMs;
  unsigned short CreationTime,CreationDate,AccessDate;
  unsigned short FirstClusterHigh;                      // higher
  unsigned short UpdateTime;                            //time create/update
  unsigned short UpdateDate;                            //date create/update
  unsigned short FirstCluster;
  unsigned long  FileSize;
};

typedef struct _FATDirEntry FAT_DIR_ENTRY, *PFAT_DIR_ENTRY;

struct _FATXDirEntry
{
   unsigned char FilenameLength; // 0
   unsigned char Attrib;         // 1
   unsigned char Filename[42];   // 2
   unsigned long FirstCluster;   // 44
   unsigned long FileSize;       // 48
   unsigned short UpdateTime;    // 52
   unsigned short UpdateDate;    // 54
   unsigned short CreationTime;  // 56
   unsigned short CreationDate;  // 58
   unsigned short AccessTime;    // 60
   unsigned short AccessDate;    // 62
};

struct _slot
{
  unsigned char id;               // sequence number for slot
  WCHAR  name0_4[5];              // first 5 characters in name
  unsigned char attr;             // attribute byte
  unsigned char reserved;         // always 0
  unsigned char alias_checksum;   // checksum for 8.3 alias
  WCHAR  name5_10[6];             // 6 more characters in name
  unsigned char start[2];         // starting cluster number
  WCHAR  name11_12[2];            // last 2 characters in name
};

typedef struct _slot slot;

#include <poppack.h>

#define VFAT_CASE_LOWER_BASE	8  		// base is lower case
#define VFAT_CASE_LOWER_EXT 	16 		// extension is lower case

#define LONGNAME_MAX_LENGTH 	256		// max length for a long filename

#define ENTRY_DELETED(DeviceExt, DirEntry) ((DeviceExt)->Flags & VCB_IS_FATX ? FATX_ENTRY_DELETED(&((DirEntry)->FatX)) : FAT_ENTRY_DELETED(&((DirEntry)->Fat)))
#define ENTRY_VOLUME(DeviceExt, DirEntry)  ((DeviceExt)->Flags & VCB_IS_FATX ? FATX_ENTRY_VOLUME(&((DirEntry)->FatX)) : FAT_ENTRY_VOLUME(&((DirEntry)->Fat)))
#define ENTRY_END(DeviceExt, DirEntry)     ((DeviceExt)->Flags & VCB_IS_FATX ? FATX_ENTRY_END(&((DirEntry)->FatX)) : FAT_ENTRY_END(&((DirEntry)->Fat)))

#define FAT_ENTRY_DELETED(DirEntry)  ((DirEntry)->Filename[0] == 0xe5)
#define FAT_ENTRY_END(DirEntry)      ((DirEntry)->Filename[0] == 0)
#define FAT_ENTRY_LONG(DirEntry)     (((DirEntry)->Attrib & 0x3f) == 0x0f)
#define FAT_ENTRY_VOLUME(DirEntry)   (((DirEntry)->Attrib & 0x1f) == 0x08)

#define FATX_ENTRY_DELETED(DirEntry) ((DirEntry)->FilenameLength == 0xe5)
#define FATX_ENTRY_END(DirEntry)     ((DirEntry)->FilenameLength == 0xff)
#define FATX_ENTRY_LONG(DirEntry)    (FALSE)
#define FATX_ENTRY_VOLUME(DirEntry)  (((DirEntry)->Attrib & 0x1f) == 0x08)

#define FAT_ENTRIES_PER_PAGE   (PAGE_SIZE / sizeof (FAT_DIR_ENTRY))
#define FATX_ENTRIES_PER_PAGE  (PAGE_SIZE / sizeof (FATX_DIR_ENTRY))

typedef struct _FATXDirEntry FATX_DIR_ENTRY, *PFATX_DIR_ENTRY;

union _DIR_ENTRY
{
   FAT_DIR_ENTRY Fat;
   FATX_DIR_ENTRY FatX;
};

typedef union _DIR_ENTRY DIR_ENTRY, *PDIR_ENTRY;

#define BLOCKSIZE 512

#define FAT16  (1)
#define FAT12  (2)
#define FAT32  (3)
#define FATX16 (4)
#define FATX32 (5)

#define VCB_VOLUME_LOCKED       0x0001
#define VCB_DISMOUNT_PENDING    0x0002
#define VCB_IS_FATX             0x0004
#define VCB_IS_DIRTY            0x4000 /* Volume is dirty */
#define VCB_CLEAR_DIRTY         0x8000 /* Clean dirty flag at shutdown */

typedef struct
{
  ULONG VolumeID;
  ULONG FATStart;
  ULONG FATCount;
  ULONG FATSectors;
  ULONG rootDirectorySectors;
  ULONG rootStart;
  ULONG dataStart;
  ULONG RootCluster;
  ULONG SectorsPerCluster;
  ULONG BytesPerSector;
  ULONG BytesPerCluster;
  ULONG NumberOfClusters;
  ULONG FatType;
  ULONG Sectors;
  BOOLEAN FixedMedia;
} FATINFO, *PFATINFO;

struct _VFATFCB;
struct _VFAT_DIRENTRY_CONTEXT;

typedef struct _HASHENTRY
{
  ULONG Hash;
  struct _VFATFCB* self;
  struct _HASHENTRY* next;
}
HASHENTRY;

#define FCB_HASH_TABLE_SIZE 65536

typedef struct DEVICE_EXTENSION *PDEVICE_EXTENSION;

typedef NTSTATUS (*PGET_NEXT_CLUSTER)(PDEVICE_EXTENSION,ULONG,PULONG);
typedef NTSTATUS (*PFIND_AND_MARK_AVAILABLE_CLUSTER)(PDEVICE_EXTENSION,PULONG);
typedef NTSTATUS (*PWRITE_CLUSTER)(PDEVICE_EXTENSION,ULONG,ULONG,PULONG);

typedef NTSTATUS (*PGET_NEXT_DIR_ENTRY)(PVOID*,PVOID*,struct _VFATFCB*,struct _VFAT_DIRENTRY_CONTEXT*,BOOLEAN);

typedef struct DEVICE_EXTENSION
{
  ERESOURCE DirResource;
  ERESOURCE FatResource;

  KSPIN_LOCK FcbListLock;
  LIST_ENTRY FcbListHead;
  ULONG HashTableSize;
  struct _HASHENTRY** FcbHashTable;

  PDEVICE_OBJECT StorageDevice;
  PFILE_OBJECT FATFileObject;
  FATINFO FatInfo;
  ULONG LastAvailableCluster;
  ULONG AvailableClusters;
  BOOLEAN AvailableClustersValid;
  ULONG Flags;
  struct _VFATFCB * VolumeFcb;

  /* Pointers to functions for manipulating FAT. */
  PGET_NEXT_CLUSTER GetNextCluster;
  PFIND_AND_MARK_AVAILABLE_CLUSTER FindAndMarkAvailableCluster;
  PWRITE_CLUSTER WriteCluster;
  ULONG CleanShutBitMask;

  /* Pointers to functions for manipulating directory entries. */
  PGET_NEXT_DIR_ENTRY GetNextDirEntry;

  ULONG BaseDateYear;

  LIST_ENTRY VolumeListEntry;
} DEVICE_EXTENSION, VCB, *PVCB;

typedef struct
{
  PDRIVER_OBJECT DriverObject;
  PDEVICE_OBJECT DeviceObject;
  ULONG Flags;
  ERESOURCE VolumeListLock;
  LIST_ENTRY VolumeListHead;
  NPAGED_LOOKASIDE_LIST FcbLookasideList;
  NPAGED_LOOKASIDE_LIST CcbLookasideList;
  NPAGED_LOOKASIDE_LIST IrpContextLookasideList;
  FAST_IO_DISPATCH FastIoDispatch;
  CACHE_MANAGER_CALLBACKS CacheMgrCallbacks;
} VFAT_GLOBAL_DATA, *PVFAT_GLOBAL_DATA;

extern PVFAT_GLOBAL_DATA VfatGlobalData;

#define FCB_CACHE_INITIALIZED   0x0001
#define FCB_DELETE_PENDING      0x0002
#define FCB_IS_FAT              0x0004
#define FCB_IS_PAGE_FILE        0x0008
#define FCB_IS_VOLUME           0x0010
#define FCB_IS_DIRTY            0x0020
#define FCB_IS_FATX_ENTRY       0x0040

typedef struct _VFATFCB
{
  /* FCB header required by ROS/NT */
  FSRTL_COMMON_FCB_HEADER RFCB;
  SECTION_OBJECT_POINTERS SectionObjectPointers;
  ERESOURCE MainResource;
  ERESOURCE PagingIoResource;
  /* end FCB header required by ROS/NT */

  /* directory entry for this file or directory */
  DIR_ENTRY entry;

  /* Pointer to attributes in entry */
  PUCHAR Attributes;

  /* long file name, points into PathNameBuffer */
  UNICODE_STRING LongNameU;

  /* short file name */
  UNICODE_STRING ShortNameU;

  /* directory name, points into PathNameBuffer */
  UNICODE_STRING DirNameU;

  /* path + long file name 260 max*/
  UNICODE_STRING PathNameU;

  /* buffer for PathNameU */
  PWCHAR PathNameBuffer;

  /* buffer for ShortNameU */
  WCHAR ShortNameBuffer[13];

  /* */
  LONG RefCount;

  /* List of FCB's for this volume */
  LIST_ENTRY FcbListEntry;

  /* pointer to the parent fcb */
  struct _VFATFCB* parentFcb;

  /* Flags for the fcb */
  ULONG Flags;

  /* pointer to the file object which has initialized the fcb */
  PFILE_OBJECT FileObject;

  /* Directory index for the short name entry */
  ULONG dirIndex;

  /* Directory index where the long name starts */
  ULONG startIndex;

  /* Share access for the file object */
  SHARE_ACCESS FCBShareAccess;

  /* Incremented on IRP_MJ_CREATE, decremented on IRP_MJ_CLEANUP */
  ULONG OpenHandleCount;

  /* Entry into the hash table for the path + long name */
  HASHENTRY Hash;

  /* Entry into the hash table for the path + short name */
  HASHENTRY ShortHash;

  /* List of byte-range locks for this file */
  FILE_LOCK FileLock;

  /*
   * Optimalization: caching of last read/write cluster+offset pair. Can't
   * be in VFATCCB because it must be reset everytime the allocated clusters
   * change.
   */
  FAST_MUTEX LastMutex;
  ULONG LastCluster;
  ULONG LastOffset;
} VFATFCB, *PVFATFCB;

typedef struct _VFATCCB
{
  LARGE_INTEGER  CurrentByteOffset;
  /* for DirectoryControl */
  ULONG Entry;
  /* for DirectoryControl */
  UNICODE_STRING SearchPattern;
} VFATCCB, *PVFATCCB;

#ifndef TAG
#define TAG(A, B, C, D) (ULONG)(((A)<<0) + ((B)<<8) + ((C)<<16) + ((D)<<24))
#endif

#define TAG_CCB TAG('V', 'C', 'C', 'B')
#define TAG_FCB TAG('V', 'F', 'C', 'B')
#define TAG_IRP TAG('V', 'I', 'R', 'P')