tfs.h

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