include/linux/fs.h

/* */
   1 /*
   2  * This file has definitions for some important file table
   3  * structures etc.
   4  */
   5 
   6 #ifndef _FS_H
   7 #define _FS_H
   8 
   9 #include <sys/types.h>
  10 #include <sys/dirent.h>
  11 
  12 /* devices are as follows: (same as minix, so we can use the minix
  13  * file system. These are major numbers.)
  14  *
  15  * 0 - unused (nodev)
  16  * 1 - /dev/mem
  17  * 2 - /dev/fd
  18  * 3 - /dev/hd
  19  * 4 - /dev/ttyx
  20  * 5 - /dev/tty
  21  * 6 - /dev/lp
  22  * 7 - unnamed pipes
  23  * 8 - /dev/sd
  24  * 9 - /dev/st
  25  */
  26 
  27 #define IS_SEEKABLE(x) ((x)>=1 && (x)<=3 || (x)==8)
  28 
  29 #define MAY_EXEC 1
  30 #define MAY_WRITE 2
  31 #define MAY_READ 4
  32 
  33 #define READ 0
  34 #define WRITE 1
  35 #define READA 2         /* read-ahead - don't pause */
  36 #define WRITEA 3        /* "write-ahead" - silly, but somewhat useful */
  37 
  38 void buffer_init(long buffer_end);
  39 
  40 #define MAJOR(a) (((unsigned)(a))>>8)
  41 #define MINOR(a) ((a)&0xff)
  42 
  43 #define NR_OPEN 20
  44 #define NR_INODE 128
  45 #define NR_FILE 64
  46 #define NR_SUPER 8
  47 #define NR_HASH 307
  48 #define NR_BUFFERS nr_buffers
  49 #define BLOCK_SIZE 1024
  50 #define BLOCK_SIZE_BITS 10
  51 #define MAX_CHRDEV 16
  52 #define MAX_BLKDEV 16
  53 
  54 #ifndef NULL
  55 #define NULL ((void *) 0)
  56 #endif
  57 
  58 #define PIPE_READ_WAIT(inode) ((inode).i_wait)
  59 #define PIPE_WRITE_WAIT(inode) ((inode).i_wait2)
  60 #define PIPE_HEAD(inode) ((inode).i_data[0])
  61 #define PIPE_TAIL(inode) ((inode).i_data[1])
  62 #define PIPE_SIZE(inode) ((PIPE_HEAD(inode)-PIPE_TAIL(inode))&(PAGE_SIZE-1))
  63 #define PIPE_EMPTY(inode) (PIPE_HEAD(inode)==PIPE_TAIL(inode))
  64 #define PIPE_FULL(inode) (PIPE_SIZE(inode)==(PAGE_SIZE-1))
  65 
  66 #define NIL_FILP        ((struct file *)0)
  67 #define SEL_IN          1
  68 #define SEL_OUT         2
  69 #define SEL_EX          4
  70 
  71 typedef char buffer_block[BLOCK_SIZE];
  72 
  73 struct buffer_head {
  74         char * b_data;                  /* pointer to data block (1024 bytes) */
  75         unsigned long b_blocknr;        /* block number */
  76         unsigned short b_dev;           /* device (0 = free) */
  77         unsigned char b_uptodate;
  78         unsigned char b_dirt;           /* 0-clean,1-dirty */
  79         unsigned char b_count;          /* users using this block */
  80         unsigned char b_lock;           /* 0 - ok, 1 -locked */
  81         struct task_struct * b_wait;
  82         struct buffer_head * b_prev;
  83         struct buffer_head * b_next;
  84         struct buffer_head * b_prev_free;
  85         struct buffer_head * b_next_free;
  86         struct buffer_head * b_reqnext;
  87 };
  88 
  89 struct inode {
  90         dev_t   i_dev;
  91         ino_t   i_ino;
  92         umode_t i_mode;
  93         nlink_t i_nlink;
  94         uid_t   i_uid;
  95         gid_t   i_gid;
  96         dev_t   i_rdev;
  97         off_t   i_size;
  98         time_t  i_atime;
  99         time_t  i_mtime;
 100         time_t  i_ctime;
 101         unsigned long i_data[16];
 102         struct inode_operations * i_op;
 103         struct super_block * i_sb;
 104         struct task_struct * i_wait;
 105         struct task_struct * i_wait2;   /* for pipes */
 106         unsigned short i_count;
 107         unsigned char i_lock;
 108         unsigned char i_dirt;
 109         unsigned char i_pipe;
 110         unsigned char i_mount;
 111         unsigned char i_seek;
 112         unsigned char i_update;
 113 };
 114 
 115 struct file {
 116         unsigned short f_mode;
 117         unsigned short f_flags;
 118         unsigned short f_count;
 119         unsigned short f_reada;
 120         struct inode * f_inode;
 121         struct file_operations * f_op;
 122         off_t f_pos;
 123 };
 124 
 125 typedef struct {
 126         struct task_struct * old_task;
 127         struct task_struct ** wait_address;
 128 } wait_entry;
 129 
 130 typedef struct select_table_struct {
 131         int nr, woken;
 132         struct task_struct * current;
 133         struct select_table_struct * next_table;
 134         wait_entry entry[NR_OPEN*3];
 135 } select_table;
 136 
 137 struct super_block {
 138         unsigned short s_ninodes;
 139         unsigned short s_nzones;
 140         unsigned short s_imap_blocks;
 141         unsigned short s_zmap_blocks;
 142         unsigned short s_firstdatazone;
 143         unsigned short s_log_zone_size;
 144         unsigned long s_max_size;
 145         unsigned short s_magic;
 146 /* These are only in memory */
 147         struct buffer_head * s_imap[8];
 148         struct buffer_head * s_zmap[8];
 149         unsigned short s_dev;
 150         struct inode * s_covered;
 151         struct inode * s_mounted;
 152         unsigned long s_time;
 153         struct task_struct * s_wait;
 154         unsigned char s_lock;
 155         unsigned char s_rd_only;
 156         unsigned char s_dirt;
 157         /* TUBE */
 158         struct super_operations *s_op;
 159 };
 160 
 161 struct file_operations {
 162         int (*lseek) (struct inode *, struct file *, off_t, int);
 163         int (*read) (struct inode *, struct file *, char *, int);
 164         int (*write) (struct inode *, struct file *, char *, int);
 165         int (*readdir) (struct inode *, struct file *, struct dirent *, int count);
 166         int (*select) (struct inode *, struct file *, int, select_table *);
 167         int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned int);
 168         int (*open) (struct inode *, struct file *);
 169         void (*release) (struct inode *, struct file *);
 170 };
 171 
 172 struct inode_operations {
 173         struct file_operations * default_file_ops;
 174         int (*create) (struct inode *,const char *,int,int,struct inode **);
 175         int (*lookup) (struct inode *,const char *,int,struct inode **);
 176         int (*link) (struct inode *,struct inode *,const char *,int);
 177         int (*unlink) (struct inode *,const char *,int);
 178         int (*symlink) (struct inode *,const char *,int,const char *);
 179         int (*mkdir) (struct inode *,const char *,int,int);
 180         int (*rmdir) (struct inode *,const char *,int);
 181         int (*mknod) (struct inode *,const char *,int,int,int);
 182         int (*rename) (struct inode *,const char *,int,struct inode *,const char *,int);
 183         int (*readlink) (struct inode *,char *,int);
 184         struct inode * (*follow_link) (struct inode *, struct inode *);
 185         int (*bmap) (struct inode *,int);
 186         void (*truncate) (struct inode *);
 187 };
 188 
 189 struct super_operations {
 190         void (*read_inode)(struct inode *inode);
 191         void (*write_inode) (struct inode *inode);
 192         void (*put_inode) (struct inode *inode);
 193         void (*put_super)(struct super_block *sb);
 194 };
 195 
 196 struct file_system_type {
 197         struct super_block *(*read_super)(struct super_block *sb,void *mode);
 198         char *name;
 199 };
 200 
 201 extern struct file_operations * chrdev_fops[MAX_CHRDEV];
 202 extern struct file_operations * blkdev_fops[MAX_BLKDEV];
 203 
 204 extern struct file_system_type *get_fs_type(char *name);
 205 
 206 extern struct inode inode_table[NR_INODE];
 207 extern struct file file_table[NR_FILE];
 208 extern struct super_block super_block[NR_SUPER];
 209 extern struct buffer_head * start_buffer;
 210 extern int nr_buffers;
 211 
 212 extern void check_disk_change(int dev);
 213 extern int floppy_change(struct buffer_head * first_block);
 214 extern int ticks_to_floppy_on(unsigned int dev);
 215 extern void floppy_on(unsigned int dev);
 216 extern void floppy_off(unsigned int dev);
 217 extern void sync_inodes(void);
 218 extern void wait_on(struct inode * inode);
 219 extern int bmap(struct inode * inode,int block);
 220 extern struct inode * namei(const char * pathname);
 221 extern struct inode * lnamei(const char * pathname);
 222 extern int permission(struct inode * inode,int mask);
 223 extern struct inode * _namei(const char * filename, struct inode * base,
 224         int follow_links);
 225 extern int open_namei(const char * pathname, int flag, int mode,
 226         struct inode ** res_inode);
 227 extern void iput(struct inode * inode);
 228 extern struct inode * iget(int dev,int nr);
 229 extern struct inode * get_empty_inode(void);
 230 extern struct inode * get_pipe_inode(void);
 231 extern struct buffer_head * get_hash_table(int dev, int block);
 232 extern struct buffer_head * getblk(int dev, int block);
 233 extern void ll_rw_block(int rw, struct buffer_head * bh);
 234 extern void ll_rw_page(int rw, int dev, int nr, char * buffer);
 235 extern void ll_rw_swap_file(int rw, int dev, unsigned int *b, int nb, char *buffer);
 236 extern void brelse(struct buffer_head * buf);
 237 extern struct buffer_head * bread(int dev,int block);
 238 extern void bread_page(unsigned long addr,int dev,int b[4]);
 239 extern struct buffer_head * breada(int dev,int block,...);
 240 extern int sync_dev(int dev);
 241 extern struct super_block * get_super(int dev);
 242 extern int ROOT_DEV;
 243 
 244 extern void mount_root(void);
 245 extern void lock_super(struct super_block * sb);
 246 extern void free_super(struct super_block * sb);
 247 
 248 extern int char_read(struct inode *, struct file *, char *, int);
 249 extern int block_read(struct inode *, struct file *, char *, int);
 250 
 251 extern int char_write(struct inode *, struct file *, char *, int);
 252 extern int block_write(struct inode *, struct file *, char *, int);
 253 
 254 #endif
/* */
root/include/linux/fs.h

INCLUDED FROM
