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/linkage.h>
  10 #include <linux/limits.h>
  11 #include <linux/wait.h>
  12 #include <linux/types.h>
  13 #include <linux/dirent.h>
  14 #include <linux/vfs.h>
  15 #include <linux/net.h>
  16 
  17 /*
  18  * It's silly to have NR_OPEN bigger than NR_FILE, but I'll fix
  19  * that later. Anyway, now the file code is no longer dependent
  20  * on bitmaps in unsigned longs, but uses the new fd_set structure..
  21  *
  22  * Some programs (notably those using select()) may have to be 
  23  * recompiled to take full advantage of the new limits..
  24  */
  25 #undef NR_OPEN
  26 #define NR_OPEN 256
  27 
  28 #define NR_INODE 2048   /* this should be bigger than NR_FILE */
  29 #define NR_FILE 1024    /* this can well be larger on a larger system */
  30 #define NR_SUPER 32
  31 #define NR_HASH 997
  32 #define NR_IHASH 131
  33 #define NR_FILE_LOCKS 64
  34 #define BLOCK_SIZE 1024
  35 #define BLOCK_SIZE_BITS 10
  36 
  37 #define MAY_EXEC 1
  38 #define MAY_WRITE 2
  39 #define MAY_READ 4
  40 
  41 #define READ 0
  42 #define WRITE 1
  43 #define READA 2         /* read-ahead - don't pause */
  44 #define WRITEA 3        /* "write-ahead" - silly, but somewhat useful */
  45 
  46 extern void buffer_init(void);
  47 extern unsigned long inode_init(unsigned long start, unsigned long end);
  48 extern unsigned long file_table_init(unsigned long start, unsigned long end);
  49 
  50 #define MAJOR(a) (int)((unsigned short)(a) >> 8)
  51 #define MINOR(a) (int)((unsigned short)(a) & 0xFF)
  52 #define MKDEV(a,b) ((int)((((a) & 0xff) << 8) | ((b) & 0xff)))
  53 
  54 #ifndef NULL
  55 #define NULL ((void *) 0)
  56 #endif
  57 
  58 #define NIL_FILP        ((struct file *)0)
  59 #define SEL_IN          1
  60 #define SEL_OUT         2
  61 #define SEL_EX          4
  62 
  63 /*
  64  * These are the fs-independent mount-flags: up to 16 flags are supported
  65  */
  66 #define MS_RDONLY    1 /* mount read-only */
  67 #define MS_NOSUID    2 /* ignore suid and sgid bits */
  68 #define MS_NODEV     4 /* disallow access to device special files */
  69 #define MS_NOEXEC    8 /* disallow program execution */
  70 #define MS_SYNC     16 /* writes are synced at once */
  71 #define MS_REMOUNT  32 /* alter flags of a mounted FS */
  72 
  73 /*
  74  * Flags that can be altered by MS_REMOUNT
  75  */
  76 #define MS_RMT_MASK (MS_RDONLY)
  77 
  78 /*
  79  * Magic mount flag number. Has to be or-ed to the flag values.
  80  */
  81 #define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */
  82 #define MS_MGC_MSK 0xffff0000 /* magic flag number mask */
  83 
  84 /*
  85  * Note that read-only etc flags are inode-specific: setting some file-system
  86  * flags just means all the inodes inherit those flags by default. It might be
  87  * possible to overrride it sevelctively if you really wanted to with some
  88  * ioctl() that is not currently implemented.
  89  *
  90  * Exception: MS_RDONLY is always applied to the entire file system.
  91  */
  92 #define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY))
  93 #define IS_NOSUID(inode) ((inode)->i_flags & MS_NOSUID)
  94 #define IS_NODEV(inode) ((inode)->i_flags & MS_NODEV)
  95 #define IS_NOEXEC(inode) ((inode)->i_flags & MS_NOEXEC)
  96 #define IS_SYNC(inode) ((inode)->i_flags & MS_SYNC)
  97 
  98 /* the read-only stuff doesn't really belong here, but any other place is
  99    probably as bad and I don't want to create yet another include file. */
 100 
 101 #define BLKROSET 4701 /* set device read-only (0 = read-write) */
 102 #define BLKROGET 4702 /* get read-only status (0 = read_write) */
 103 #define BLKRRPART 4703 /* re-read partition table */
 104 #define BLKGETSIZE 4704 /* return device size */
 105 #define BLKFLSBUF 4705 /* flush buffer cache */
 106 
 107 /* These are a few other constants  only used by scsi  devices */
 108 
 109 #define SCSI_IOCTL_GET_IDLUN 0x5382
 110 
 111 /* Used to turn on and off tagged queueing for scsi devices */
 112 
 113 #define SCSI_IOCTL_TAGGED_ENABLE 0x5383
 114 #define SCSI_IOCTL_TAGGED_DISABLE 0x5384
 115 
 116 
 117 #define BMAP_IOCTL 1    /* obsolete - kept for compatibility */
 118 #define FIBMAP     1    /* bmap access */
 119 #define FIGETBSZ   2    /* get the block size used for bmap */
 120 
 121 /* these flags tell notify_change what is being changed */
 122 
 123 #define NOTIFY_SIZE     1
 124 #define NOTIFY_MODE     2
 125 #define NOTIFY_TIME     4
 126 #define NOTIFY_UIDGID   8
 127 
 128 typedef char buffer_block[BLOCK_SIZE];
 129 
 130 struct buffer_head {
 131         char * b_data;                  /* pointer to data block (1024 bytes) */
 132         unsigned long b_size;           /* block size */
 133         unsigned long b_blocknr;        /* block number */
 134         dev_t b_dev;                    /* device (0 = free) */
 135         unsigned short b_count;         /* users using this block */
 136         unsigned char b_uptodate;
 137         unsigned char b_dirt;           /* 0-clean,1-dirty */
 138         unsigned char b_lock;           /* 0 - ok, 1 -locked */
 139         unsigned char b_req;            /* 0 if the buffer has been invalidated */
 140         struct wait_queue * b_wait;
 141         struct buffer_head * b_prev;            /* doubly linked list of hash-queue */
 142         struct buffer_head * b_next;
 143         struct buffer_head * b_prev_free;       /* doubly linked list of buffers */
 144         struct buffer_head * b_next_free;
 145         struct buffer_head * b_this_page;       /* circular list of buffers in one page */
 146         struct buffer_head * b_reqnext;         /* request queue */
 147 };
 148 
 149 #include <linux/pipe_fs_i.h>
 150 #include <linux/minix_fs_i.h>
 151 #include <linux/ext_fs_i.h>
 152 #include <linux/ext2_fs_i.h>
 153 #include <linux/hpfs_fs_i.h>
 154 #include <linux/msdos_fs_i.h>
 155 #include <linux/iso_fs_i.h>
 156 #include <linux/nfs_fs_i.h>
 157 #include <linux/xia_fs_i.h>
 158 #include <linux/sysv_fs_i.h>
 159 
 160 struct inode {
 161         dev_t           i_dev;
 162         unsigned long   i_ino;
 163         umode_t         i_mode;
 164         nlink_t         i_nlink;
 165         uid_t           i_uid;
 166         gid_t           i_gid;
 167         dev_t           i_rdev;
 168         off_t           i_size;
 169         time_t          i_atime;
 170         time_t          i_mtime;
 171         time_t          i_ctime;
 172         unsigned long   i_blksize;
 173         unsigned long   i_blocks;
 174         struct inode_operations * i_op;
 175         struct super_block * i_sb;
 176         struct wait_queue * i_wait;
 177         struct file_lock * i_flock;
 178         struct vm_area_struct * i_mmap;
 179         struct inode * i_next, * i_prev;
 180         struct inode * i_hash_next, * i_hash_prev;
 181         struct inode * i_bound_to, * i_bound_by;
 182         struct inode * i_mount;
 183         struct socket * i_socket;
 184         unsigned short i_count;
 185         unsigned short i_flags;
 186         unsigned char i_lock;
 187         unsigned char i_dirt;
 188         unsigned char i_pipe;
 189         unsigned char i_seek;
 190         unsigned char i_update;
 191         union {
 192                 struct pipe_inode_info pipe_i;
 193                 struct minix_inode_info minix_i;
 194                 struct ext_inode_info ext_i;
 195                 struct ext2_inode_info ext2_i;
 196                 struct hpfs_inode_info hpfs_i;
 197                 struct msdos_inode_info msdos_i;
 198                 struct iso_inode_info isofs_i;
 199                 struct nfs_inode_info nfs_i;
 200                 struct xiafs_inode_info xiafs_i;
 201                 struct sysv_inode_info sysv_i;
 202         } u;
 203 };
 204 
 205 struct file {
 206         mode_t f_mode;
 207         dev_t f_rdev;                   /* needed for /dev/tty */
 208         off_t f_pos;
 209         unsigned short f_flags;
 210         unsigned short f_count;
 211         unsigned short f_reada;
 212         struct file *f_next, *f_prev;
 213         struct inode * f_inode;
 214         struct file_operations * f_op;
 215 };
 216 
 217 struct file_lock {
 218         struct file_lock *fl_next;      /* singly linked list */
 219         struct task_struct *fl_owner;   /* NULL if on free list, for sanity checks */
 220         unsigned int fl_fd;             /* File descriptor for this lock */
 221         struct wait_queue *fl_wait;
 222         char fl_type;
 223         char fl_whence;
 224         off_t fl_start;
 225         off_t fl_end;
 226 };
 227 
 228 #include <linux/minix_fs_sb.h>
 229 #include <linux/ext_fs_sb.h>
 230 #include <linux/ext2_fs_sb.h>
 231 #include <linux/hpfs_fs_sb.h>
 232 #include <linux/msdos_fs_sb.h>
 233 #include <linux/iso_fs_sb.h>
 234 #include <linux/nfs_fs_sb.h>
 235 #include <linux/xia_fs_sb.h>
 236 #include <linux/sysv_fs_sb.h>
 237 
 238 struct super_block {
 239         dev_t s_dev;
 240         unsigned long s_blocksize;
 241         unsigned char s_blocksize_bits;
 242         unsigned char s_lock;
 243         unsigned char s_rd_only;
 244         unsigned char s_dirt;
 245         struct super_operations *s_op;
 246         unsigned long s_flags;
 247         unsigned long s_magic;
 248         unsigned long s_time;
 249         struct inode * s_covered;
 250         struct inode * s_mounted;
 251         struct wait_queue * s_wait;
 252         union {
 253                 struct minix_sb_info minix_sb;
 254                 struct ext_sb_info ext_sb;
 255                 struct ext2_sb_info ext2_sb;
 256                 struct hpfs_sb_info hpfs_sb;
 257                 struct msdos_sb_info msdos_sb;
 258                 struct isofs_sb_info isofs_sb;
 259                 struct nfs_sb_info nfs_sb;
 260                 struct xiafs_sb_info xiafs_sb;
 261                 struct sysv_sb_info sysv_sb;
 262         } u;
 263 };
 264 
 265 struct file_operations {
 266         int (*lseek) (struct inode *, struct file *, off_t, int);
 267         int (*read) (struct inode *, struct file *, char *, int);
 268         int (*write) (struct inode *, struct file *, char *, int);
 269         int (*readdir) (struct inode *, struct file *, struct dirent *, int);
 270         int (*select) (struct inode *, struct file *, int, select_table *);
 271         int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
 272         int (*mmap) (struct inode *, struct file *, unsigned long, size_t, int, unsigned long);
 273         int (*open) (struct inode *, struct file *);
 274         void (*release) (struct inode *, struct file *);
 275         int (*fsync) (struct inode *, struct file *);
 276 };
 277 
 278 struct inode_operations {
 279         struct file_operations * default_file_ops;
 280         int (*create) (struct inode *,const char *,int,int,struct inode **);
 281         int (*lookup) (struct inode *,const char *,int,struct inode **);
 282         int (*link) (struct inode *,struct inode *,const char *,int);
 283         int (*unlink) (struct inode *,const char *,int);
 284         int (*symlink) (struct inode *,const char *,int,const char *);
 285         int (*mkdir) (struct inode *,const char *,int,int);
 286         int (*rmdir) (struct inode *,const char *,int);
 287         int (*mknod) (struct inode *,const char *,int,int,int);
 288         int (*rename) (struct inode *,const char *,int,struct inode *,const char *,int);
 289         int (*readlink) (struct inode *,char *,int);
 290         int (*follow_link) (struct inode *,struct inode *,int,int,struct inode **);
 291         int (*bmap) (struct inode *,int);
 292         void (*truncate) (struct inode *);
 293         int (*permission) (struct inode *, int);
 294 };
 295 
 296 struct super_operations {
 297         void (*read_inode) (struct inode *);
 298         int (*notify_change) (int flags, struct inode *);
 299         void (*write_inode) (struct inode *);
 300         void (*put_inode) (struct inode *);
 301         void (*put_super) (struct super_block *);
 302         void (*write_super) (struct super_block *);
 303         void (*statfs) (struct super_block *, struct statfs *);
 304         int (*remount_fs) (struct super_block *, int *, char *);
 305 };
 306 
 307 struct file_system_type {
 308         struct super_block *(*read_super) (struct super_block *, void *, int);
 309         char *name;
 310         int requires_dev;
 311 };
 312 
 313 #ifdef __KERNEL__
 314 
 315 asmlinkage int sys_open(const char *, int, int);
 316 asmlinkage int sys_close(unsigned int);         /* yes, it's really unsigned */
 317 
 318 extern int getname(const char * filename, char **result);
 319 extern void putname(char * name);
 320 
 321 extern int register_blkdev(unsigned int, const char *, struct file_operations *);
 322 extern int blkdev_open(struct inode * inode, struct file * filp);
 323 extern struct file_operations def_blk_fops;
 324 extern struct inode_operations blkdev_inode_operations;
 325 
 326 extern int register_chrdev(unsigned int, const char *, struct file_operations *);
 327 extern int unregister_chrdev( unsigned int major, const char * name);
 328 extern int chrdev_open(struct inode * inode, struct file * filp);
 329 extern struct file_operations def_chr_fops;
 330 extern struct inode_operations chrdev_inode_operations;
 331 
 332 extern void init_fifo(struct inode * inode);
 333 
 334 extern struct file_operations connecting_fifo_fops;
 335 extern struct file_operations read_fifo_fops;
 336 extern struct file_operations write_fifo_fops;
 337 extern struct file_operations rdwr_fifo_fops;
 338 extern struct file_operations read_pipe_fops;
 339 extern struct file_operations write_pipe_fops;
 340 extern struct file_operations rdwr_pipe_fops;
 341 
 342 extern struct file_system_type *get_fs_type(char *name);
 343 
 344 extern int fs_may_mount(dev_t dev);
 345 extern int fs_may_umount(dev_t dev, struct inode * mount_root);
 346 extern int fs_may_remount_ro(dev_t dev);
 347 
 348 extern struct file *first_file;
 349 extern int nr_files;
 350 extern struct super_block super_blocks[NR_SUPER];
 351 
 352 extern int shrink_buffers(unsigned int priority);
 353 
 354 extern int nr_buffers;
 355 extern int buffermem;
 356 extern int nr_buffer_heads;
 357 
 358 extern void check_disk_change(dev_t dev);
 359 extern void invalidate_inodes(dev_t dev);
 360 extern void invalidate_buffers(dev_t dev);
 361 extern int floppy_change(struct buffer_head * first_block);
 362 extern void sync_inodes(dev_t dev);
 363 extern void sync_dev(dev_t dev);
 364 extern int fsync_dev(dev_t dev);
 365 extern void sync_supers(dev_t dev);
 366 extern int bmap(struct inode * inode,int block);
 367 extern int notify_change(int flags, struct inode * inode);
 368 extern int namei(const char * pathname, struct inode ** res_inode);
 369 extern int lnamei(const char * pathname, struct inode ** res_inode);
 370 extern int permission(struct inode * inode,int mask);
 371 extern int open_namei(const char * pathname, int flag, int mode,
 372         struct inode ** res_inode, struct inode * base);
 373 extern int do_mknod(const char * filename, int mode, dev_t dev);
 374 extern void iput(struct inode * inode);
 375 extern struct inode * __iget(struct super_block * sb,int nr,int crsmnt);
 376 extern struct inode * iget(struct super_block * sb,int nr);
 377 extern struct inode * get_empty_inode(void);
 378 extern void insert_inode_hash(struct inode *);
 379 extern void clear_inode(struct inode *);
 380 extern struct inode * get_pipe_inode(void);
 381 extern struct file * get_empty_filp(void);
 382 extern struct buffer_head * get_hash_table(dev_t dev, int block, int size);
 383 extern struct buffer_head * getblk(dev_t dev, int block, int size);
 384 extern void ll_rw_block(int rw, int nr, struct buffer_head * bh[]);
 385 extern void ll_rw_page(int rw, int dev, int nr, char * buffer);
 386 extern void ll_rw_swap_file(int rw, int dev, unsigned int *b, int nb, char *buffer);
 387 extern void brelse(struct buffer_head * buf);
 388 extern void set_blocksize(dev_t dev, int size);
 389 extern struct buffer_head * bread(dev_t dev, int block, int size);
 390 extern unsigned long bread_page(unsigned long addr,dev_t dev,int b[],int size,int prot);
 391 extern struct buffer_head * breada(dev_t dev,int block,...);
 392 extern void put_super(dev_t dev);
 393 extern dev_t ROOT_DEV;
 394 
 395 extern void mount_root(void);
 396 
 397 extern int char_read(struct inode *, struct file *, char *, int);
 398 extern int block_read(struct inode *, struct file *, char *, int);
 399 extern int read_ahead[];
 400 
 401 extern int char_write(struct inode *, struct file *, char *, int);
 402 extern int block_write(struct inode *, struct file *, char *, int);
 403 
 404 extern int generic_mmap(struct inode *, struct file *, unsigned long, size_t, int, unsigned long);
 405 
 406 extern int block_fsync(struct inode *, struct file *);
 407 extern int file_fsync(struct inode *, struct file *);
 408 
 409 #endif /* __KERNEL__ */
 410 
 411 #endif
/* */
root/include/linux/fs.h

INCLUDED FROM
