include/linux/fs.h

/* */
   1 #ifndef _LINUX_FS_H
   2 #define _LINUX_FS_H
   3 
   4 /*
   5  * This file has definitions for some important file table
   6  * structures etc.
   7  */
   8 
   9 #include <linux/limits.h>
  10 #include <linux/wait.h>
  11 #include <linux/types.h>
  12 #include <linux/dirent.h>
  13 #include <linux/vfs.h>
  14 
  15 /*
  16  * It's silly to have NR_OPEN bigger than NR_FILE, but I'll fix
  17  * that later. Anyway, now the file code is no longer dependent
  18  * on bitmaps in unsigned longs, but uses the new fd_set structure..
  19  *
  20  * Some programs (notably those using select()) may have to be 
  21  * recompiled to take full advantage of the new limits..
  22  */
  23 #undef NR_OPEN
  24 #define NR_OPEN 256
  25 
  26 #define NR_INODE 128
  27 #define NR_FILE 128
  28 #define NR_SUPER 16
  29 #define NR_HASH 997
  30 #define NR_FILE_LOCKS 32
  31 #define BLOCK_SIZE 1024
  32 #define BLOCK_SIZE_BITS 10
  33 #define MAX_CHRDEV 32
  34 #define MAX_BLKDEV 32
  35 
  36 /* devices are as follows: (same as minix, so we can use the minix
  37  * file system. These are major numbers.)
  38  *
  39  *  0 - unnamed (minor 0 = true nodev)
  40  *  1 - /dev/mem
  41  *  2 - /dev/fd
  42  *  3 - /dev/hd
  43  *  4 - /dev/ttyx
  44  *  5 - /dev/tty
  45  *  6 - /dev/lp
  46  *  7 -
  47  *  8 - /dev/sd
  48  *  9 - /dev/st
  49  * 10 - mice
  50  * 11 - scsi cdrom
  51  * 12 -
  52  * 13 -
  53  * 14 - sound card (?)
  54  * 15 -
  55  */
  56 
  57 #define UNNAMED_MAJOR 0
  58 
  59 #define MAY_EXEC 1
  60 #define MAY_WRITE 2
  61 #define MAY_READ 4
  62 
  63 #define READ 0
  64 #define WRITE 1
  65 #define READA 2         /* read-ahead - don't pause */
  66 #define WRITEA 3        /* "write-ahead" - silly, but somewhat useful */
  67 
  68 extern void buffer_init(void);
  69 extern void inode_init(void);
  70 
  71 #define MAJOR(a) (((unsigned)(a))>>8)
  72 #define MINOR(a) ((a)&0xff)
  73 
  74 #ifndef NULL
  75 #define NULL ((void *) 0)
  76 #endif
  77 
  78 #define NIL_FILP        ((struct file *)0)
  79 #define SEL_IN          1
  80 #define SEL_OUT         2
  81 #define SEL_EX          4
  82 
  83 /*
  84  * These are the fs-independent mount-flags: up to 16 flags are supported
  85  */
  86 #define MS_RDONLY    1 /* mount read-only */
  87 #define MS_NOSUID    2 /* ignore suid and sgid bits */
  88 #define MS_NODEV     4 /* disallow access to device special files */
  89 #define MS_NOEXEC    8 /* disallow program execution */
  90 #define MS_SYNC     16 /* writes are synced at once */
  91 
  92 /*
  93  * Note that read-only etc flags are inode-specific: setting some file-system
  94  * flags just means all the inodes inherit those flags by default. It might be
  95  * possible to overrride it sevelctively if you really wanted to with some
  96  * ioctl() that is not currently implemented.
  97  */
  98 #define IS_RDONLY(inode) ((inode)->i_flags & MS_RDONLY)
  99 #define IS_NOSUID(inode) ((inode)->i_flags & MS_NOSUID)
 100 #define IS_NODEV(inode) ((inode)->i_flags & MS_NODEV)
 101 #define IS_NOEXEC(inode) ((inode)->i_flags & MS_NOEXEC)
 102 #define IS_SYNC(inode) ((inode)->i_flags & MS_SYNC)
 103 
 104 /* the read-only stuff doesn't really belong here, but any other place is
 105    probably as bad and I don't want to create yet another include file. */
 106 
 107 #define BLKROSET 4701 /* set device read-only (0 = read-write) */
 108 #define BLKROGET 4702 /* get read-only status (0 = read_write) */
 109 #define BLKRRPART 4703 /* re-read partition table */
 110 #define BLKGETSIZE 4704 /* return device size */
 111 
 112 #define BMAP_IOCTL 1    /* obsolete - kept for compatibility */
 113 #define FIBMAP     1    /* bmap access */
 114 #define FIGETBSZ   2    /* get the block size used for bmap */
 115 
 116 typedef char buffer_block[BLOCK_SIZE];
 117 
 118 struct buffer_head {
 119         char * b_data;                  /* pointer to data block (1024 bytes) */
 120         unsigned long b_size;           /* block size */
 121         unsigned long b_blocknr;        /* block number */
 122         dev_t b_dev;                    /* device (0 = free) */
 123         unsigned short b_count;         /* users using this block */
 124         unsigned char b_uptodate;
 125         unsigned char b_dirt;           /* 0-clean,1-dirty */
 126         unsigned char b_lock;           /* 0 - ok, 1 -locked */
 127         struct wait_queue * b_wait;
 128         struct buffer_head * b_prev;            /* doubly linked list of hash-queue */
 129         struct buffer_head * b_next;
 130         struct buffer_head * b_prev_free;       /* doubly linked list of buffers */
 131         struct buffer_head * b_next_free;
 132         struct buffer_head * b_this_page;       /* circular list of buffers in one page */
 133         struct buffer_head * b_reqnext;         /* request queue */
 134 };
 135 
 136 #include <linux/pipe_fs_i.h>
 137 #include <linux/minix_fs_i.h>
 138 #include <linux/ext_fs_i.h>
 139 #include <linux/msdos_fs_i.h>
 140 #include <linux/iso_fs_i.h>
 141 
 142 struct inode {
 143         dev_t           i_dev;
 144         unsigned long   i_ino;
 145         umode_t         i_mode;
 146         nlink_t         i_nlink;
 147         uid_t           i_uid;
 148         gid_t           i_gid;
 149         dev_t           i_rdev;
 150         off_t           i_size;
 151         time_t          i_atime;
 152         time_t          i_mtime;
 153         time_t          i_ctime;
 154         unsigned long   i_blksize;
 155         unsigned long   i_blocks;
 156         struct inode_operations * i_op;
 157         struct super_block * i_sb;
 158         struct wait_queue * i_wait;
 159         struct file_lock * i_flock;
 160         struct vm_area_struct * i_mmap;
 161         struct inode * i_next, * i_prev;
 162         struct inode * i_hash_next, * i_hash_prev;
 163         struct inode * i_bound_to, * i_bound_by;
 164         unsigned short i_count;
 165         unsigned short i_flags;
 166         unsigned char i_lock;
 167         unsigned char i_dirt;
 168         unsigned char i_pipe;
 169         unsigned char i_mount;
 170         unsigned char i_seek;
 171         unsigned char i_update;
 172         union {
 173                 struct pipe_inode_info pipe_i;
 174                 struct minix_inode_info minix_i;
 175                 struct ext_inode_info ext_i;
 176                 struct msdos_inode_info msdos_i;
 177                 struct iso_inode_info isofs_i;
 178         } u;
 179 };
 180 
 181 struct file {
 182         mode_t f_mode;
 183         dev_t f_rdev;                   /* needed for /dev/tty */
 184         off_t f_pos;
 185         unsigned short f_flags;
 186         unsigned short f_count;
 187         unsigned short f_reada;
 188         struct inode * f_inode;
 189         struct file_operations * f_op;
 190 };
 191 
 192 struct file_lock {
 193         struct file_lock *fl_next;      /* singly linked list */
 194         struct task_struct *fl_owner;   /* NULL if on free list, for sanity checks */
 195         struct wait_queue *fl_wait;
 196         char fl_type;
 197         char fl_whence;
 198         off_t fl_start;
 199         off_t fl_end;
 200 };
 201 
 202 #include <linux/minix_fs_sb.h>
 203 #include <linux/ext_fs_sb.h>
 204 #include <linux/msdos_fs_sb.h>
 205 #include <linux/iso_fs_sb.h>
 206 
 207 struct super_block {
 208         dev_t s_dev;
 209         unsigned long s_blocksize;
 210         unsigned char s_lock;
 211         unsigned char s_rd_only;
 212         unsigned char s_dirt;
 213         struct super_operations *s_op;
 214         unsigned long s_flags;
 215         unsigned long s_magic;
 216         unsigned long s_time;
 217         struct inode * s_covered;
 218         struct inode * s_mounted;
 219         struct wait_queue * s_wait;
 220         union {
 221                 struct minix_sb_info minix_sb;
 222                 struct ext_sb_info ext_sb;
 223                 struct msdos_sb_info msdos_sb;
 224                 struct isofs_sb_info isofs_sb;
 225         } u;
 226 };
 227 
 228 struct file_operations {
 229         int (*lseek) (struct inode *, struct file *, off_t, int);
 230         int (*read) (struct inode *, struct file *, char *, int);
 231         int (*write) (struct inode *, struct file *, char *, int);
 232         int (*readdir) (struct inode *, struct file *, struct dirent *, int);
 233         int (*select) (struct inode *, struct file *, int, select_table *);
 234         int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned int);
 235         int (*mmap) (void);
 236         int (*open) (struct inode *, struct file *);
 237         void (*release) (struct inode *, struct file *);
 238 };
 239 
 240 struct inode_operations {
 241         struct file_operations * default_file_ops;
 242         int (*create) (struct inode *,const char *,int,int,struct inode **);
 243         int (*lookup) (struct inode *,const char *,int,struct inode **);
 244         int (*link) (struct inode *,struct inode *,const char *,int);
 245         int (*unlink) (struct inode *,const char *,int);
 246         int (*symlink) (struct inode *,const char *,int,const char *);
 247         int (*mkdir) (struct inode *,const char *,int,int);
 248         int (*rmdir) (struct inode *,const char *,int);
 249         int (*mknod) (struct inode *,const char *,int,int,int);
 250         int (*rename) (struct inode *,const char *,int,struct inode *,const char *,int);
 251         int (*readlink) (struct inode *,char *,int);
 252         int (*follow_link) (struct inode *,struct inode *,int,int,struct inode **);
 253         int (*bmap) (struct inode *,int);
 254         void (*truncate) (struct inode *);
 255 };
 256 
 257 struct super_operations {
 258         void (*read_inode) (struct inode *);
 259         int (*notify_change) (struct inode *);
 260         void (*write_inode) (struct inode *);
 261         void (*put_inode) (struct inode *);
 262         void (*put_super) (struct super_block *);
 263         void (*write_super) (struct super_block *);
 264         void (*statfs) (struct super_block *, struct statfs *);
 265 };
 266 
 267 struct file_system_type {
 268         struct super_block *(*read_super) (struct super_block *, void *);
 269         char *name;
 270         int requires_dev;
 271 };
 272 
 273 extern struct file_operations * chrdev_fops[MAX_CHRDEV];
 274 extern struct file_operations * blkdev_fops[MAX_BLKDEV];
 275 
 276 extern struct file_system_type *get_fs_type(char *name);
 277 
 278 extern int fs_may_mount(dev_t dev);
 279 extern int fs_may_umount(dev_t dev, struct inode * mount_root);
 280 
 281 extern struct file file_table[NR_FILE];
 282 extern struct super_block super_block[NR_SUPER];
 283 
 284 extern void grow_buffers(int size);
 285 extern int shrink_buffers(unsigned int priority);
 286 
 287 extern int nr_buffers;
 288 extern int buffermem;
 289 extern int nr_buffer_heads;
 290 
 291 extern void check_disk_change(dev_t dev);
 292 extern void invalidate_inodes(dev_t dev);
 293 extern void invalidate_buffers(dev_t dev);
 294 extern int floppy_change(struct buffer_head * first_block);
 295 extern int ticks_to_floppy_on(unsigned int dev);
 296 extern void floppy_on(unsigned int dev);
 297 extern void floppy_off(unsigned int dev);
 298 extern void sync_inodes(dev_t dev);
 299 extern void sync_dev(dev_t dev);
 300 extern void sync_supers(dev_t dev);
 301 extern int bmap(struct inode * inode,int block);
 302 extern int notify_change(struct inode * inode);
 303 extern int namei(const char * pathname, struct inode ** res_inode);
 304 extern int lnamei(const char * pathname, struct inode ** res_inode);
 305 extern int permission(struct inode * inode,int mask);
 306 extern int open_namei(const char * pathname, int flag, int mode,
 307         struct inode ** res_inode, struct inode * base);
 308 extern int do_mknod(const char * filename, int mode, dev_t dev);
 309 extern void iput(struct inode * inode);
 310 extern struct inode * iget(struct super_block * sb,int nr);
 311 extern struct inode * get_empty_inode(void);
 312 extern void clear_inode(struct inode *);
 313 extern struct inode * get_pipe_inode(void);
 314 extern struct file * get_empty_filp(void);
 315 extern struct buffer_head * get_hash_table(dev_t dev, int block, int size);
 316 extern struct buffer_head * getblk(dev_t dev, int block, int size);
 317 extern void ll_rw_block(int rw, int nr, struct buffer_head * bh[]);
 318 extern void ll_rw_page(int rw, int dev, int nr, char * buffer);
 319 extern void ll_rw_swap_file(int rw, int dev, unsigned int *b, int nb, char *buffer);
 320 extern void brelse(struct buffer_head * buf);
 321 extern struct buffer_head * bread(dev_t dev, int block, int size);
 322 extern void bread_page(unsigned long addr,dev_t dev,int b[4]);
 323 extern struct buffer_head * breada(dev_t dev,int block,...);
 324 extern void put_super(dev_t dev);
 325 extern dev_t ROOT_DEV;
 326 
 327 extern void mount_root(void);
 328 
 329 extern int char_read(struct inode *, struct file *, char *, int);
 330 extern int block_read(struct inode *, struct file *, char *, int);
 331 extern int read_ahead[];
 332 
 333 extern int char_write(struct inode *, struct file *, char *, int);
 334 extern int block_write(struct inode *, struct file *, char *, int);
 335 
 336 #endif
/* */
root/include/linux/fs.h

INCLUDED FROM
