tfs.h

   1 #ifndef TFS_H
   2 #define TFS_H
   3
   4 #include <stdint.h>
   5
   6 /* It's really enought for a test file system */
   7 #define TFS_N_BLOCKS 8
   8
   9 struct tfs_inode {
  10         uint16_t i_mode;                /* File mode */
  11         uint16_t i_uid;                 /* Owner UID */
  12         uint32_t i_size;                /* File size */
  13         uint32_t i_atime;               /* Access time */
  14         uint32_t i_ctime;               /* Create time */
  15         uint32_t i_mtime;               /* modify time */
  16         uint32_t i_dtime;               /* delete time */
  17         uint32_t i_block[TFS_N_BLOCKS]; /* block address of file's count */
  18         uint32_t i_flags;               /* flags */
  19         uint32_t i_reserved[1];
  20 };
  21
  22 /*
  23  * The inode structure in memory, including the detail file information
  24  */
  25 struct inode {
  26         int          i_mode;   /* FILE or DIR */
  27         uint32_t     i_size;
  28         uint32_t     i_ino;    /* Inode number */
  29         uint32_t     i_atime;  /* Access time */
  30         uint32_t     i_mtime;  /* Modify time */
  31         uint32_t     i_ctime;  /* Create time */
  32         uint32_t     i_dtime;  /* Delete time */
  33         uint32_t *   i_data;   /* The block address array where the file stores */
  34         uint32_t     i_flags;
  35 };
  36
  37 /* The max lenght of each file name */
  38 #define TFS_NAME_LEN 28
  39 struct tfs_dir_entry {
  40         uint32_t d_inode;               /* inode number */
  41         char     d_name[TFS_NAME_LEN];  /* entry name */
  42 };
  43
  44 #define TFS_MAGIC  0x4c534654           /* TFSL */
  45
  46 /* TFS super block */
  47 struct tfs_super_block {
  48         uint32_t s_inodes_count;        /* Max file count */
  49         uint32_t s_blocks_count;
  50         uint32_t s_free_blocks_count;
  51         uint32_t s_free_inodes_count;
  52         uint32_t s_magic;               /* TFS's magic signature */
  53         uint32_t s_block_shift;         /* Block size */
  54
  55         uint32_t s_inode_bitmap;
  56         uint32_t s_block_bitmap;
  57         uint32_t s_inode_table;
  58         uint32_t s_data_area;           /* where the data starts */
  59
  60
  61         uint32_t s_offset;              /* In which sector the fs stored */
  62         uint32_t s_reserved[117];
  63 };
  64
  65 /* TFS super block  info */
  66 struct tfs_sb_info {
  67         uint32_t s_inodes_count;        /* Max file count */
  68         uint32_t s_blocks_count;
  69         uint32_t s_free_blocks_count;
  70         uint32_t s_free_inodes_count;
  71         uint32_t s_block_shift;         /* Block size in bits */
  72         uint32_t s_block_size;          /* Block size in bytes */
  73
  74         uint32_t s_inode_bitmap;
  75         uint32_t s_inode_bitmap_count;
  76         uint32_t s_block_bitmap;
  77         uint32_t s_block_bitmap_count;
  78         uint32_t s_inode_table;
  79         uint32_t s_inode_table_count;
  80         uint32_t s_data_area;           /* where the data starts */
  81
  82
  83         uint32_t s_offset;              /* In which sector the fs stored */
  84 };
  85
  86 /* utils.c */
  87 extern int set_bit(void *, unsigned int);
  88 extern int clear_bit(void *, unsigned int);
  89 extern int test_bit(const void *, unsigned int);
  90 extern uint32_t find_first_zero(void *, void *);
  91
  92 extern int write_sector(uint32_t, void *, int);
  93 extern int read_sector(uint32_t, void *, int);
  94 extern int tfs_bread(struct tfs_sb_info *, uint32_t , void *);
  95 extern int tfs_bwrite(struct tfs_sb_info *, uint32_t, void *);
  96
  97 /* super.c */
  98 struct tfs_sb_info * tfs_mount(void);
  99 struct tfs_sb_info * tfs_mount_by_fsname(const char *);
 100 #endif /* tfs.h */