include/tfs.h

   1 #ifndef TFS_H
   2 #define TFS_H
   3
   4 #include <stdint.h>
   5
   6 /* in whice sector the tfs stored in the boot image */
   7 #define TFS_FS_SECTOR   (832)
   8 #define TFS_SB_SECTOR   (TFS_FS_SECTOR + 1)
   9
  10 #define TFS_ROOT_INODE  1
  11 #define TFS_FILE        0x1
  12 #define TFS_DIR         0x2
  13
  14 /* namei: path lookup flags */
  15 #define LOOKUP_PARENT   0x1
  16 #define LOOKUP_CREATE   0x2
  17
  18 /* just support I_FILE and I_DIR only currently */
  19 enum tfs_inode_mode { I_FILE, I_DIR, I_UNKNOWN };
  20
  21 static inline int get_mode(int mode)
  22 {
  23         if (mode & TFS_FILE)
  24                 return I_FILE;
  25         else if (mode & TFS_DIR)
  26                 return I_DIR;
  27         else
  28                 return I_UNKNOWN;
  29 }
  30
  31 /* It's really enought for a test file system */
  32 #define TFS_N_BLOCKS 8
  33
  34 struct tfs_inode {
  35         uint16_t i_mode;                /* File mode */
  36         uint16_t i_uid;                 /* Owner UID */
  37         uint32_t i_size;                /* File size */
  38         uint32_t i_atime;               /* Access time */
  39         uint32_t i_ctime;               /* Create time */
  40         uint32_t i_mtime;               /* modify time */
  41         uint32_t i_dtime;               /* delete time */
  42         uint32_t i_block[TFS_N_BLOCKS]; /* block address of file's count */
  43         uint32_t i_flags;               /* flags */
  44         uint32_t i_reserved[1];
  45 };
  46
  47 /*
  48  * The inode structure in memory, including the detail file information
  49  */
  50 struct inode {
  51         int          i_mode;   /* FILE or DIR */
  52         uint32_t     i_size;
  53         uint32_t     i_ino;    /* Inode number */
  54         uint32_t     i_atime;  /* Access time */
  55         uint32_t     i_mtime;  /* Modify time */
  56         uint32_t     i_ctime;  /* Create time */
  57         uint32_t     i_dtime;  /* Delete time */
  58         uint32_t *   i_data;   /* The block address array where the file stores */
  59         uint32_t     i_flags;
  60 };
  61
  62 /* The max lenght of each file name */
  63 #define TFS_NAME_LEN 28
  64 struct tfs_dir_entry {
  65         uint32_t d_inode;               /* inode number */
  66         char     d_name[TFS_NAME_LEN];  /* entry name */
  67 };
  68
  69 #define TFS_MAGIC  0x4c534654           /* TFSL */
  70
  71 /* TFS super block */
  72 struct tfs_super_block {
  73         uint32_t s_inodes_count;        /* Max file count */
  74         uint32_t s_blocks_count;
  75         uint32_t s_free_blocks_count;
  76         uint32_t s_free_inodes_count;
  77         uint32_t s_magic;               /* TFS's magic signature */
  78         uint32_t s_block_shift;         /* Block size */
  79
  80         uint32_t s_inode_bitmap;
  81         uint32_t s_block_bitmap;
  82         uint32_t s_inode_table;
  83         uint32_t s_data_area;           /* where the data starts */
  84
  85
  86         uint32_t s_offset;              /* In which sector the fs stored */
  87         uint32_t s_reserved[117];
  88 };
  89
  90 /* TFS super block  info */
  91 struct tfs_sb_info {
  92         uint32_t s_inodes_count;        /* Max file count */
  93         uint32_t s_blocks_count;
  94         uint32_t s_free_blocks_count;
  95         uint32_t s_free_inodes_count;
  96         uint32_t s_block_shift;         /* Block size in bits */
  97         uint32_t s_block_size;          /* Block size in bytes */
  98
  99         uint32_t s_inode_bitmap;
 100         uint32_t s_inode_bitmap_count;
 101         uint32_t s_block_bitmap;
 102         uint32_t s_block_bitmap_count;
 103         uint32_t s_inode_table;
 104         uint32_t s_inode_table_count;
 105         uint32_t s_data_area;           /* where the data starts */
 106
 107
 108         uint32_t s_offset;              /* In which sector the fs stored */
 109
 110         int      s_inodes_per_block;
 111 };
 112
 113 extern struct tfs_sb_info *tfs_sbi;
 114
 115
 116 #define TFS_INODES_PER_BLOCK(sbi) (sbi->s_inodes_per_block)
 117
 118 #define TFS_DEBUG printk
 119
 120 #define roundup(x, y) ((x) / (y) + (((x) % (y)) ? 1 : 0))
 121
 122 /* tfs_diskio.c */
 123 extern void tfs_bread(struct tfs_sb_info *, uint32_t , void *);
 124 extern void tfs_bwrite(struct tfs_sb_info *, uint32_t, void *);
 125
 126 /* super.c */
 127 struct tfs_sb_info * tfs_mount(void);
 128
 129 /* ialloc.c */
 130 int tfs_free_inode(struct tfs_sb_info *, int);
 131 int tfs_alloc_inode(struct tfs_sb_info *, int);
 132
 133 /* balloc.c */
 134 int tfs_alloc_block(struct tfs_sb_info *, uint32_t);
 135 int tfs_free_block(struct tfs_sb_info *, uint32_t);
 136
 137
 138 /* dir.c */
 139 struct cache_struct *tfs_find_entry(struct tfs_sb_info *, const char *, struct inode *, struct tfs_dir_entry **);
 140 int tfs_add_entry(struct tfs_sb_info *, struct inode *, const char *, int , int *);
 141 int tfs_mkdir(struct tfs_sb_info *, const char *);
 142 int tfs_rmdir(struct tfs_sb_info *, const char *);
 143
 144 /* inode.c */
 145 struct inode *new_inode(int);
 146 void free_inode(struct inode *);
 147 struct inode *tfs_root_init(struct tfs_sb_info *);
 148 struct inode *tfs_iget_root(struct tfs_sb_info *);
 149 struct inode *tfs_iget(struct tfs_sb_info *, char *, struct inode *);
 150 struct inode *tfs_namei(struct tfs_sb_info *, const char *, uint32_t);
 151 uint32_t tfs_bmap(struct inode *, int);
 152 int tfs_iwrite(struct tfs_sb_info *, struct inode *);
 153 struct inode *__mknod(struct tfs_sb_info *, struct inode *, const char *, int);
 154 struct inode *tfs_mknod(struct tfs_sb_info *, const char *, int, struct inode **);
 155 const char *get_base_name(const char *);
 156
 157 #endif /* tfs.h */