include/fs.h

   1 #ifndef FS_H
   2 #define FS_H
   3
   4 #include <stdint.h>
   5
   6 #define FS_DEBUG //printk
   7
   8 #define MAX_NAME_LEN    255
   9
  10 #define BLOCK_SIZE(fs)  (1 << (fs)->block_shift)
  11 #define SECTOR_SIZE(fs) (1 << (fs)->sector_shift)
  12
  13 /* namei: path lookup flags */
  14 #define LOOKUP_PARENT   0x1
  15 #define LOOKUP_CREATE   0x2
  16
  17 #define TFS_FILE        0x1
  18 #define TFS_DIR         0x2
  19 #define IS_DIR(dir)     ((dir)->i_mode == TFS_DIR)
  20
  21 #define MAX_CWD_LEN     255
  22
  23 struct fs {
  24         char *name;
  25         void *sb;       /* The fs-specific information */
  26         int sector_shift;
  27         int block_shift;
  28
  29         uint32_t offset; /* Disk offset as sectors */
  30
  31         char cwd[MAX_CWD_LEN];
  32         struct inode *pwd;
  33         struct inode *root;
  34 };
  35
  36 struct fs_type {
  37         void * (*mount)(void);
  38         int    (*get_blk_shift)(void *);
  39 };
  40
  41 #define SEEK_SET 0
  42 #define SEEK_CUR 1
  43 #define SEEK_END 2
  44
  45
  46 struct file {
  47         struct inode * inode;
  48         struct fs    * fs;
  49         uint32_t       offset;
  50
  51         struct file_operations *f_op;
  52 };
  53
  54 /*
  55  * The inode structure of VFS layer
  56  */
  57 struct inode {
  58         int          i_mode;   /* FILE or DIR */
  59         uint32_t     i_size;
  60         uint32_t     i_ino;    /* Inode number */
  61         uint32_t     i_atime;  /* Access time */
  62         uint32_t     i_mtime;  /* Modify time */
  63         uint32_t     i_ctime;  /* Create time */
  64         uint32_t     i_dtime;  /* Delete time */
  65         uint32_t *   i_data;   /* The block address array where the file stores */
  66         uint32_t     i_flags;
  67
  68         int          i_blksize;
  69
  70         struct fs *  i_fs;
  71
  72         /* Operations */
  73         struct inode_operations * i_op;
  74         struct file_operations  * i_fop;
  75 };
  76
  77 struct inode_operations {
  78         struct inode * (*iget) (const char *, struct inode *);
  79         struct inode * (*iget_root)(struct fs *fs);
  80         struct inode * (*iget_by_inr)(int);
  81         int (*iwrite) (struct inode *);
  82
  83         int (*mkdir)(struct inode *, const char *);
  84         int (*rmdir)(struct inode *, const char *);
  85         int (*unlink)(struct inode *, const char *);
  86         struct inode *(*mknod)(struct inode *, const char *, int);
  87 };
  88
  89 struct dirent;
  90
  91 struct file_operations {
  92         int (*read) (struct file *, void *, int);
  93         int (*write) (struct file *, void *, int);
  94         void (*close) (struct file *);
  95         struct dirent * (*readdir)(struct file *);
  96 };
  97
  98 extern struct fs * current_root_fs;
  99
 100 static inline struct fs * root_fs(void)
 101 {
 102         return current_root_fs;
 103 }
 104
 105 extern uint8_t fds[];
 106 extern struct file *files[];
 107
 108 /*
 109  * Functions
 110  */
 111
 112 /* inode.c */
 113 struct inode *new_inode(int, int);
 114 void free_inode(struct inode *);
 115 struct inode * iget(const char *, struct inode *);
 116
 117 /* file.c */
 118 int sys_open(const char *, uint32_t);
 119 int sys_read(int, void *, int);
 120 int sys_write(int, void *, int);
 121 int sys_close(int);
 122 int sys_lseek(int, int, int);
 123
 124 /* namei.c */
 125 struct inode *namei(const char *, uint32_t);
 126 struct inode *namei_parent(const char *);
 127 int sys_mkdir(const char *);
 128 int sys_rmdir(const char *);
 129 int sys_chdir(const char *);
 130 int sys_getcwd(char *, int);
 131 int sys_unlink(const char *);
 132
 133 /* exec.c */
 134 int sys_execve(const char *, char **);
 135
 136 /* fslib.c */
 137 const char *get_base_name(const char *);
 138
 139 /* super.c */
 140 struct fs *fs_init(void);
 141
 142
 143 #endif /* fs.h */