fatvar.h

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/*
** fatvar.h for  in /root/research/lseosr2a/programs/fat
** 
** Copyright (c)2004 Julien Quintard
** Login   <quinta_j@epita.fr>
** 
** Started on  Tue Mar 30 13:19:22 2004 Julien Quintard
** Last update Mon Dec  6 12:24:19 2004 Vianney Rancurel
*/
#ifndef __FATVAR_H__
#define __FATVAR_H__       1
#include <libc.h>
#include <libide.h>
#include <libpart.h>
#include <libtimer.h>

#define DEBUG_FAT

#define FAT_SIGNATURE           0x29
#define FAT_NAMESZ_BASE         0x8
#define FAT_NAMESZ_EXT          0x3
#define FAT_NAMESZ              (FAT_NAMESZ_BASE + FAT_NAMESZ_EXT)
#define FAT_PARENT_DIR          ".."
#define FAT_PATH_SEPARATOR      "/"
#define FAT_FREE_CLUSTER        0x00000000

#define FAT_CACHESZ             64

/*
 * fat structures
 */

typedef struct          s_fat_direntry
{
  u_int8_t              de_name[FAT_NAMESZ];

#define FAT_ATTR_READ_ONLY      0x01
#define FAT_ATTR_HIDDEN         0x02
#define FAT_ATTR_SYSTEM         0x04
#define FAT_ATTR_VOLUME_ID      0x08
#define FAT_ATTR_DIRECTORY      0x10
#define FAT_ATTR_ARCHIVE        0x20
#define FAT_ATTR_LONG_NAME      (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | \
                                 FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID)

  u_int8_t              de_attr;

#define FAT_EATTR_UW            0x01
#define FAT_EATTR_UX            0x02
#define FAT_EATTR_GW            0x04
#define FAT_EATTR_GX            0x08
#define FAT_EATTR_OW            0x10
#define FAT_EATTR_OX            0x20

  u_int8_t              de_ntres;
  u_int8_t              de_crttimetenth;
  u_int16_t             de_crttime;
  u_int16_t             de_crtdate;
  u_int16_t             de_lstaccdate;
  u_int16_t             de_fstclu_hi;
  u_int16_t             de_wrttime;
  u_int16_t             de_wrtdate;
  u_int16_t             de_fstclu_lo;
  u_int32_t             de_filesize;
}                       t_fat_direntry;

typedef struct          s_fat16
{
  /*
   * for fat12 and fat16
   */

  u_int8_t              f_drvnum;
  u_int8_t              f_reserved;
  u_int8_t              f_bootsig;
  u_int32_t             f_volid;
  u_int8_t              f_vollabel[11];
  u_int8_t              f_fstype[8];
}                       t_fat16;

typedef struct          s_fat32
{
  u_int32_t             f_fatsz_32b;
  u_int16_t             f_extflags;
  u_int16_t             f_fsver;
  u_int32_t             f_root;
  u_int16_t             f_fsinfo;
  u_int16_t             f_backup;
  u_int8_t              f_reserved1[12];
  u_int8_t              f_drvnum;
  u_int8_t              f_bootsig;
  u_int32_t             f_volid;
  u_int8_t              f_vollabel[11];
  u_int8_t              f_fstype[8];
}                       t_fat32;

typedef struct          s_fat_common
{
  u_int8_t              fc_jmp[3];
  u_int8_t              fc_oemname[8];
  u_int16_t             fc_bps;                 /* bytes per sector */
  u_int8_t              fc_spc;                 /* sectors per cluster */
  u_int16_t             fc_reserved;
  u_int8_t              fc_fats_num;
  u_int16_t             fc_root;
  u_int16_t             fc_sectors_16b;
  u_int8_t              fc_media;
  u_int16_t             fc_fatsz_16b;
  u_int16_t             fc_spt;                 /* sectors per track */
  u_int16_t             fc_heads;
  u_int32_t             fc_hidden;
  u_int32_t             fc_sectors_32b;

  union
  {
    t_fat16             fc_fat16;
    t_fat32             fc_fat32;
  } u_fat_spe;
}                       __attribute__((packed)) t_fat_common;

typedef struct          s_fat_lookup
{
  u_int32_t             l_addr;
  u_int32_t             l_addroff;
  u_int32_t             l_data;
  t_fat_direntry        l_dir;
}                       t_fat_lookup;

typedef struct          s_fat_sb
{

#define FAT_TYPE_UNKNOWN        0x0
#define FAT_TYPE_FAT12          0x1
#define FAT_TYPE_FAT16          0x2
#define FAT_TYPE_FAT32          0x3

  u_int8_t              sb_type;

#define FAT_MEDIA_UNKNOWN       0x0
#define FAT_MEDIA_FIXED         0x1
#define FAT_MEDIA_REMOVABLE     0x2

  u_int8_t              sb_media;

  u_int32_t             sb_bpc;                 /* bytes per cluster */
  u_int16_t             sb_bps;
  u_int8_t              sb_spc;
  u_int16_t             sb_spt;
  u_int16_t             sb_heads;

  u_int32_t             sb_sectors;
  u_int32_t             sb_fatsz;               /* sectors by fat */

  u_int32_t             sb_fat_start;
  u_int32_t             sb_fat_size;

  u_int16_t             sb_root;
  u_int32_t             sb_rootsz;              /* root directory sectors */

  u_int32_t             sb_fds;                 /* first data sector */
  u_int32_t             sb_data_sectors;
  u_int32_t             sb_data_clusters;

  u_int32_t             sb_root_num;
}                       t_fat_sb;

typedef struct          s_fat_cache
{
  u_int32_t             offset;
  void                  *buffer;
}                       t_fat_cache;

typedef struct          s_fat_fs
{
  /*
   * owner of the mounted filesystem
   */

  u_int32_t             fs_uid;
  u_int32_t             fs_gid;

  /*
   * device
   */

  u_int32_t             fs_dev;

  /*
   * part
   */

  u_int32_t             fs_pdev;
  u_int32_t             fs_id;
  u_int32_t             fs_unit;

  u_int32_t             fs_start;
  u_int32_t             fs_size;

  /*
   * fat superblock
   */

  t_fat_sb              fs_sb;

  /*
   * fat cache
   */

  t_fat_cache           fs_cache[FAT_CACHESZ];
}                       t_fat_fs;

typedef struct          s_fat
{
  __cpu_simple_lock_t   f_lock;
}                       t_fat;

/* ---------------------------------------------------------*/

typedef struct          s_fat_fd
{
  u_int8_t              fd_state;
  u_int32_t             fd_type;

  u_int32_t             fd_addr;
  u_int32_t             fd_addroff;

  u_int32_t             fd_data;
  u_int32_t             fd_size;

  u_int32_t             fd_offset;
}                       t_fat_fd;

void                    sys_fat(void);

/* PROTO main.c */
#ifdef KERNEL
/* main.c */
#endif /* KERNEL */
#endif

---