root/include/linux/fs.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. buffer_uptodate
  2. buffer_dirty
  3. buffer_locked
  4. buffer_req
  5. buffer_touched
  6. buffer_has_aged
  7. mark_buffer_uptodate
  8. mark_buffer_clean
  9. mark_buffer_dirty
  10. brelse
  11. bforget
  12. iget

   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/vfs.h>
  14 #include <linux/net.h>
  15 #include <linux/kdev_t.h>
  16 #include <linux/ioctl.h>
  17 
  18 #include <asm/bitops.h>
  19 
  20 /*
  21  * It's silly to have NR_OPEN bigger than NR_FILE, but I'll fix
  22  * that later. Anyway, now the file code is no longer dependent
  23  * on bitmaps in unsigned longs, but uses the new fd_set structure..
  24  *
  25  * Some programs (notably those using select()) may have to be 
  26  * recompiled to take full advantage of the new limits..
  27  */
  28 #undef NR_OPEN
  29 #define NR_OPEN 256
  30 
  31 #define NR_INODE 2048   /* this should be bigger than NR_FILE */
  32 #define NR_FILE 1024    /* this can well be larger on a larger system */
  33 #define NR_SUPER 32
  34 #define NR_IHASH 131
  35 #define BLOCK_SIZE 1024
  36 #define BLOCK_SIZE_BITS 10
  37 
  38 #define MAY_EXEC 1
  39 #define MAY_WRITE 2
  40 #define MAY_READ 4
  41 
  42 #define READ 0
  43 #define WRITE 1
  44 #define READA 2         /* read-ahead - don't pause */
  45 #define WRITEA 3        /* "write-ahead" - silly, but somewhat useful */
  46 
  47 #ifndef NULL
  48 #define NULL ((void *) 0)
  49 #endif
  50 
  51 #define NIL_FILP        ((struct file *)0)
  52 #define SEL_IN          1
  53 #define SEL_OUT         2
  54 #define SEL_EX          4
  55 
  56 /*
  57  * These are the fs-independent mount-flags: up to 16 flags are supported
  58  */
  59 #define MS_RDONLY        1 /* mount read-only */
  60 #define MS_NOSUID        2 /* ignore suid and sgid bits */
  61 #define MS_NODEV         4 /* disallow access to device special files */
  62 #define MS_NOEXEC        8 /* disallow program execution */
  63 #define MS_SYNCHRONOUS  16 /* writes are synced at once */
  64 #define MS_REMOUNT      32 /* alter flags of a mounted FS */
  65 
  66 #define S_APPEND    256 /* append-only file */
  67 #define S_IMMUTABLE 512 /* immutable file */
  68 
  69 /*
  70  * Flags that can be altered by MS_REMOUNT
  71  */
  72 #define MS_RMT_MASK (MS_RDONLY)
  73 
  74 /*
  75  * Magic mount flag number. Has to be or-ed to the flag values.
  76  */
  77 #define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */
  78 #define MS_MGC_MSK 0xffff0000 /* magic flag number mask */
  79 
  80 /*
  81  * Note that read-only etc flags are inode-specific: setting some file-system
  82  * flags just means all the inodes inherit those flags by default. It might be
  83  * possible to override it selectively if you really wanted to with some
  84  * ioctl() that is not currently implemented.
  85  *
  86  * Exception: MS_RDONLY is always applied to the entire file system.
  87  */
  88 #define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY))
  89 #define IS_NOSUID(inode) ((inode)->i_flags & MS_NOSUID)
  90 #define IS_NODEV(inode) ((inode)->i_flags & MS_NODEV)
  91 #define IS_NOEXEC(inode) ((inode)->i_flags & MS_NOEXEC)
  92 #define IS_SYNC(inode) ((inode)->i_flags & MS_SYNCHRONOUS)
  93 
  94 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
  95 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
  96 
  97 /* the read-only stuff doesn't really belong here, but any other place is
  98    probably as bad and I don't want to create yet another include file. */
  99 
 100 #define BLKROSET   _IO(0x12,93) /* set device read-only (0 = read-write) */
 101 #define BLKROGET   _IO(0x12,94) /* get read-only status (0 = read_write) */
 102 #define BLKRRPART  _IO(0x12,95) /* re-read partition table */
 103 #define BLKGETSIZE _IO(0x12,96) /* return device size */
 104 #define BLKFLSBUF  _IO(0x12,97) /* flush buffer cache */
 105 #define BLKRASET   _IO(0x12,98) /* Set read ahead for block device */
 106 #define BLKRAGET   _IO(0x12,99) /* get current read ahead setting */
 107 
 108 #define BMAP_IOCTL 1            /* obsolete - kept for compatibility */
 109 #define FIBMAP     _IO(0x00,1)  /* bmap access */
 110 #define FIGETBSZ   _IO(0x00,2)  /* get the block size used for bmap */
 111 
 112 #ifdef __KERNEL__
 113 extern void buffer_init(void);
 114 extern unsigned long inode_init(unsigned long start, unsigned long end);
 115 extern unsigned long file_table_init(unsigned long start, unsigned long end);
 116 extern unsigned long name_cache_init(unsigned long start, unsigned long end);
 117 
 118 typedef char buffer_block[BLOCK_SIZE];
 119 
 120 /* bh state bits */
 121 #define BH_Uptodate     0       /* 1 if the buffer contains valid data */
 122 #define BH_Dirty        1       /* 1 if the buffer is dirty */
 123 #define BH_Lock         2       /* 1 if the buffer is locked */
 124 #define BH_Req          3       /* 0 if the buffer has been invalidated */
 125 #define BH_Touched      4       /* 1 if the buffer has been touched (aging) */
 126 #define BH_Has_aged     5       /* 1 if the buffer has been aged (aging) */
 127 
 128 struct buffer_head {
 129         char * b_data;                  /* pointer to data block (1024 bytes) */
 130         unsigned long b_size;           /* block size */
 131         unsigned long b_blocknr;        /* block number */
 132         kdev_t b_dev;                   /* device (B_FREE = free) */
 133         unsigned long b_state;          /* buffer state bitmap (see above) */
 134         unsigned int b_count;           /* users using this block */
 135         unsigned int b_list;            /* List that this buffer appears */
 136         unsigned long b_flushtime;      /* Time when this (dirty) buffer
 137                                          * should be written */
 138         unsigned long b_lru_time;       /* Time when this buffer was 
 139                                          * last used. */
 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 static inline int buffer_uptodate(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 150 {
 151         return test_bit(BH_Uptodate, &bh->b_state);
 152 }       
 153 
 154 static inline int buffer_dirty(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 155 {
 156         return test_bit(BH_Dirty, &bh->b_state);
 157 }
 158 
 159 static inline int buffer_locked(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 160 {
 161         return test_bit(BH_Lock, &bh->b_state);
 162 }
 163 
 164 static inline int buffer_req(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 165 {
 166         return test_bit(BH_Req, &bh->b_state);
 167 }
 168 
 169 static inline int buffer_touched(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 170 {
 171         return test_bit(BH_Touched, &bh->b_state);
 172 }
 173 
 174 static inline int buffer_has_aged(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 175 {
 176         return test_bit(BH_Has_aged, &bh->b_state);
 177 }
 178 
 179 #include <linux/pipe_fs_i.h>
 180 #include <linux/minix_fs_i.h>
 181 #include <linux/ext_fs_i.h>
 182 #include <linux/ext2_fs_i.h>
 183 #include <linux/hpfs_fs_i.h>
 184 #include <linux/msdos_fs_i.h>
 185 #include <linux/umsdos_fs_i.h>
 186 #include <linux/iso_fs_i.h>
 187 #include <linux/nfs_fs_i.h>
 188 #include <linux/xia_fs_i.h>
 189 #include <linux/sysv_fs_i.h>
 190 
 191 /*
 192  * Attribute flags.  These should be or-ed together to figure out what
 193  * has been changed!
 194  */
 195 #define ATTR_MODE       1
 196 #define ATTR_UID        2
 197 #define ATTR_GID        4
 198 #define ATTR_SIZE       8
 199 #define ATTR_ATIME      16
 200 #define ATTR_MTIME      32
 201 #define ATTR_CTIME      64
 202 #define ATTR_ATIME_SET  128
 203 #define ATTR_MTIME_SET  256
 204 
 205 /*
 206  * This is the Inode Attributes structure, used for notify_change().  It
 207  * uses the above definitions as flags, to know which values have changed.
 208  * Also, in this manner, a Filesystem can look at only the values it cares
 209  * about.  Basically, these are the attributes that the VFS layer can
 210  * request to change from the FS layer.
 211  *
 212  * Derek Atkins <warlord@MIT.EDU> 94-10-20
 213  */
 214 struct iattr {
 215         unsigned int    ia_valid;
 216         umode_t         ia_mode;
 217         uid_t           ia_uid;
 218         gid_t           ia_gid;
 219         off_t           ia_size;
 220         time_t          ia_atime;
 221         time_t          ia_mtime;
 222         time_t          ia_ctime;
 223 };
 224 
 225 struct inode {
 226         kdev_t          i_dev;
 227         unsigned long   i_ino;
 228         umode_t         i_mode;
 229         nlink_t         i_nlink;
 230         uid_t           i_uid;
 231         gid_t           i_gid;
 232         kdev_t          i_rdev;
 233         off_t           i_size;
 234         time_t          i_atime;
 235         time_t          i_mtime;
 236         time_t          i_ctime;
 237         unsigned long   i_blksize;
 238         unsigned long   i_blocks;
 239         unsigned long   i_version;
 240         struct semaphore i_sem;
 241         struct inode_operations * i_op;
 242         struct super_block * i_sb;
 243         struct wait_queue * i_wait;
 244         struct file_lock * i_flock;
 245         struct vm_area_struct * i_mmap;
 246         struct inode * i_next, * i_prev;
 247         struct inode * i_hash_next, * i_hash_prev;
 248         struct inode * i_bound_to, * i_bound_by;
 249         struct inode * i_mount;
 250         unsigned short i_count;
 251         unsigned short i_wcount;
 252         unsigned short i_flags;
 253         unsigned char i_lock;
 254         unsigned char i_dirt;
 255         unsigned char i_pipe;
 256         unsigned char i_sock;
 257         unsigned char i_seek;
 258         unsigned char i_update;
 259         union {
 260                 struct pipe_inode_info pipe_i;
 261                 struct minix_inode_info minix_i;
 262                 struct ext_inode_info ext_i;
 263                 struct ext2_inode_info ext2_i;
 264                 struct hpfs_inode_info hpfs_i;
 265                 struct msdos_inode_info msdos_i;
 266                 struct umsdos_inode_info umsdos_i;
 267                 struct iso_inode_info isofs_i;
 268                 struct nfs_inode_info nfs_i;
 269                 struct xiafs_inode_info xiafs_i;
 270                 struct sysv_inode_info sysv_i;
 271                 struct socket socket_i;
 272                 void * generic_ip;
 273         } u;
 274 };
 275 
 276 struct file {
 277         mode_t f_mode;
 278         loff_t f_pos;
 279         unsigned short f_flags;
 280         unsigned short f_count;
 281         off_t f_reada;
 282         struct file *f_next, *f_prev;
 283         int f_owner;            /* pid or -pgrp where SIGIO should be sent */
 284         struct inode * f_inode;
 285         struct file_operations * f_op;
 286         unsigned long f_version;
 287         void *private_data;     /* needed for tty driver, and maybe others */
 288 };
 289 
 290 struct file_lock {
 291         struct file_lock *fl_next;      /* singly linked list for this inode  */
 292         struct file_lock *fl_nextlink;  /* doubly linked list of all locks */
 293         struct file_lock *fl_prevlink;  /* used to simplify lock removal */
 294         struct file_lock *fl_block;
 295         struct task_struct *fl_owner;
 296         struct wait_queue *fl_wait;
 297         struct file *fl_file;
 298         char fl_flags;
 299         char fl_type;
 300         off_t fl_start;
 301         off_t fl_end;
 302 };
 303 
 304 struct fasync_struct {
 305         int    magic;
 306         struct fasync_struct    *fa_next; /* singly linked list */
 307         struct file             *fa_file;
 308 };
 309 
 310 #define FASYNC_MAGIC 0x4601
 311 
 312 extern int fasync_helper(struct inode *, struct file *, int, struct fasync_struct **);
 313 
 314 #include <linux/minix_fs_sb.h>
 315 #include <linux/ext_fs_sb.h>
 316 #include <linux/ext2_fs_sb.h>
 317 #include <linux/hpfs_fs_sb.h>
 318 #include <linux/msdos_fs_sb.h>
 319 #include <linux/iso_fs_sb.h>
 320 #include <linux/nfs_fs_sb.h>
 321 #include <linux/xia_fs_sb.h>
 322 #include <linux/sysv_fs_sb.h>
 323 
 324 struct super_block {
 325         kdev_t s_dev;
 326         unsigned long s_blocksize;
 327         unsigned char s_blocksize_bits;
 328         unsigned char s_lock;
 329         unsigned char s_rd_only;
 330         unsigned char s_dirt;
 331         struct file_system_type *s_type;
 332         struct super_operations *s_op;
 333         unsigned long s_flags;
 334         unsigned long s_magic;
 335         unsigned long s_time;
 336         struct inode * s_covered;
 337         struct inode * s_mounted;
 338         struct wait_queue * s_wait;
 339         union {
 340                 struct minix_sb_info minix_sb;
 341                 struct ext_sb_info ext_sb;
 342                 struct ext2_sb_info ext2_sb;
 343                 struct hpfs_sb_info hpfs_sb;
 344                 struct msdos_sb_info msdos_sb;
 345                 struct isofs_sb_info isofs_sb;
 346                 struct nfs_sb_info nfs_sb;
 347                 struct xiafs_sb_info xiafs_sb;
 348                 struct sysv_sb_info sysv_sb;
 349                 void *generic_sbp;
 350         } u;
 351 };
 352 
 353 /*
 354  * This is the "filldir" function type, used by readdir() to let
 355  * the kernel specify what kind of dirent layout it wants to have.
 356  * This allows the kernel to read directories into kernel space or
 357  * to have different dirent layouts depending on the binary type.
 358  */
 359 typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t);
 360         
 361 struct file_operations {
 362         int (*lseek) (struct inode *, struct file *, off_t, int);
 363         int (*read) (struct inode *, struct file *, char *, int);
 364         int (*write) (struct inode *, struct file *, const char *, int);
 365         int (*readdir) (struct inode *, struct file *, void *, filldir_t);
 366         int (*select) (struct inode *, struct file *, int, select_table *);
 367         int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
 368         int (*mmap) (struct inode *, struct file *, struct vm_area_struct *);
 369         int (*open) (struct inode *, struct file *);
 370         void (*release) (struct inode *, struct file *);
 371         int (*fsync) (struct inode *, struct file *);
 372         int (*fasync) (struct inode *, struct file *, int);
 373         int (*check_media_change) (kdev_t dev);
 374         int (*revalidate) (kdev_t dev);
 375 };
 376 
 377 struct inode_operations {
 378         struct file_operations * default_file_ops;
 379         int (*create) (struct inode *,const char *,int,int,struct inode **);
 380         int (*lookup) (struct inode *,const char *,int,struct inode **);
 381         int (*link) (struct inode *,struct inode *,const char *,int);
 382         int (*unlink) (struct inode *,const char *,int);
 383         int (*symlink) (struct inode *,const char *,int,const char *);
 384         int (*mkdir) (struct inode *,const char *,int,int);
 385         int (*rmdir) (struct inode *,const char *,int);
 386         int (*mknod) (struct inode *,const char *,int,int,int);
 387         int (*rename) (struct inode *,const char *,int,struct inode *,const char *,int);
 388         int (*readlink) (struct inode *,char *,int);
 389         int (*follow_link) (struct inode *,struct inode *,int,int,struct inode **);
 390         int (*bmap) (struct inode *,int);
 391         void (*truncate) (struct inode *);
 392         int (*permission) (struct inode *, int);
 393         int (*smap) (struct inode *,int);
 394 };
 395 
 396 struct super_operations {
 397         void (*read_inode) (struct inode *);
 398         int (*notify_change) (struct inode *, struct iattr *);
 399         void (*write_inode) (struct inode *);
 400         void (*put_inode) (struct inode *);
 401         void (*put_super) (struct super_block *);
 402         void (*write_super) (struct super_block *);
 403         void (*statfs) (struct super_block *, struct statfs *, int);
 404         int (*remount_fs) (struct super_block *, int *, char *);
 405 };
 406 
 407 struct file_system_type {
 408         struct super_block *(*read_super) (struct super_block *, void *, int);
 409         const char *name;
 410         int requires_dev;
 411         struct file_system_type * next;
 412 };
 413 
 414 extern int register_filesystem(struct file_system_type *);
 415 extern int unregister_filesystem(struct file_system_type *);
 416 
 417 asmlinkage int sys_open(const char *, int, int);
 418 asmlinkage int sys_close(unsigned int);         /* yes, it's really unsigned */
 419 
 420 extern void kill_fasync(struct fasync_struct *fa, int sig);
 421 
 422 extern int getname(const char * filename, char **result);
 423 extern void putname(char * name);
 424 
 425 extern int register_blkdev(unsigned int, const char *, struct file_operations *);
 426 extern int unregister_blkdev(unsigned int major, const char * name);
 427 extern int blkdev_open(struct inode * inode, struct file * filp);
 428 extern struct file_operations def_blk_fops;
 429 extern struct inode_operations blkdev_inode_operations;
 430 
 431 extern int register_chrdev(unsigned int, const char *, struct file_operations *);
 432 extern int unregister_chrdev(unsigned int major, const char * name);
 433 extern int chrdev_open(struct inode * inode, struct file * filp);
 434 extern struct file_operations def_chr_fops;
 435 extern struct inode_operations chrdev_inode_operations;
 436 
 437 extern void init_fifo(struct inode * inode);
 438 
 439 extern struct file_operations connecting_fifo_fops;
 440 extern struct file_operations read_fifo_fops;
 441 extern struct file_operations write_fifo_fops;
 442 extern struct file_operations rdwr_fifo_fops;
 443 extern struct file_operations read_pipe_fops;
 444 extern struct file_operations write_pipe_fops;
 445 extern struct file_operations rdwr_pipe_fops;
 446 
 447 extern struct file_system_type *get_fs_type(const char *name);
 448 
 449 extern int fs_may_mount(kdev_t dev);
 450 extern int fs_may_umount(kdev_t dev, struct inode * mount_root);
 451 extern int fs_may_remount_ro(kdev_t dev);
 452 
 453 extern struct file *first_file;
 454 extern int nr_files;
 455 extern struct super_block super_blocks[NR_SUPER];
 456 
 457 extern int shrink_buffers(unsigned int priority, unsigned long limit);
 458 extern void refile_buffer(struct buffer_head * buf);
 459 extern void set_writetime(struct buffer_head * buf, int flag);
 460 extern void refill_freelist(int size);
 461 
 462 extern struct buffer_head ** buffer_pages;
 463 extern int nr_buffers;
 464 extern int buffermem;
 465 extern int nr_buffer_heads;
 466 
 467 #define BUF_CLEAN 0
 468 #define BUF_UNSHARED 1 /* Buffers that were shared but are not any more */
 469 #define BUF_LOCKED 2   /* Buffers scheduled for write */
 470 #define BUF_LOCKED1 3  /* Supers, inodes */
 471 #define BUF_DIRTY 4    /* Dirty buffers, not yet scheduled for write */
 472 #define BUF_SHARED 5   /* Buffers shared */
 473 #define NR_LIST 6
 474 
 475 extern inline void mark_buffer_uptodate(struct buffer_head * bh, int on)
     /* [previous][next][first][last][top][bottom][index][help] */
 476 {
 477         if (on)
 478                 set_bit(BH_Uptodate, &bh->b_state);
 479         else
 480                 clear_bit(BH_Uptodate, &bh->b_state);
 481 }
 482 
 483 extern inline void mark_buffer_clean(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 484 {
 485         if (clear_bit(BH_Dirty, &bh->b_state)) {
 486                 if (bh->b_list == BUF_DIRTY)
 487                         refile_buffer(bh);
 488         }
 489 }
 490 
 491 extern inline void mark_buffer_dirty(struct buffer_head * bh, int flag)
     /* [previous][next][first][last][top][bottom][index][help] */
 492 {
 493         if (!set_bit(BH_Dirty, &bh->b_state)) {
 494                 set_writetime(bh, flag);
 495                 if (bh->b_list != BUF_DIRTY)
 496                         refile_buffer(bh);
 497         }
 498 }
 499 
 500 extern int check_disk_change(kdev_t dev);
 501 extern void invalidate_inodes(kdev_t dev);
 502 extern void invalidate_buffers(kdev_t dev);
 503 extern int floppy_is_wp(int minor);
 504 extern void sync_inodes(kdev_t dev);
 505 extern void sync_dev(kdev_t dev);
 506 extern int fsync_dev(kdev_t dev);
 507 extern void sync_supers(kdev_t dev);
 508 extern int bmap(struct inode * inode,int block);
 509 extern int notify_change(struct inode *, struct iattr *);
 510 extern int namei(const char * pathname, struct inode ** res_inode);
 511 extern int lnamei(const char * pathname, struct inode ** res_inode);
 512 extern int permission(struct inode * inode,int mask);
 513 extern int get_write_access(struct inode * inode);
 514 extern void put_write_access(struct inode * inode);
 515 extern int open_namei(const char * pathname, int flag, int mode,
 516         struct inode ** res_inode, struct inode * base);
 517 extern int do_mknod(const char * filename, int mode, dev_t dev);
 518 extern int do_pipe(int *);
 519 extern void iput(struct inode * inode);
 520 extern struct inode * __iget(struct super_block * sb,int nr,int crsmnt);
 521 extern struct inode * get_empty_inode(void);
 522 extern void insert_inode_hash(struct inode *);
 523 extern void clear_inode(struct inode *);
 524 extern struct inode * get_pipe_inode(void);
 525 extern struct file * get_empty_filp(void);
 526 extern int close_fp(struct file *filp);
 527 extern struct buffer_head * get_hash_table(kdev_t dev, int block, int size);
 528 extern struct buffer_head * getblk(kdev_t dev, int block, int size);
 529 extern void ll_rw_block(int rw, int nr, struct buffer_head * bh[]);
 530 extern void ll_rw_page(int rw, kdev_t dev, unsigned long nr, char * buffer);
 531 extern void ll_rw_swap_file(int rw, kdev_t dev, unsigned int *b, int nb, char *buffer);
 532 extern int is_read_only(kdev_t dev);
 533 extern void __brelse(struct buffer_head *buf);
 534 extern inline void brelse(struct buffer_head *buf)
     /* [previous][next][first][last][top][bottom][index][help] */
 535 {
 536         if (buf)
 537                 __brelse(buf);
 538 }
 539 extern void __bforget(struct buffer_head *buf);
 540 extern inline void bforget(struct buffer_head *buf)
     /* [previous][next][first][last][top][bottom][index][help] */
 541 {
 542         if (buf)
 543                 __bforget(buf);
 544 }
 545 extern void set_blocksize(kdev_t dev, int size);
 546 extern struct buffer_head * bread(kdev_t dev, int block, int size);
 547 extern unsigned long bread_page(unsigned long addr,kdev_t dev,int b[],int size,int no_share);
 548 extern void bwrite_page(unsigned long addr,kdev_t dev,int b[],int size);
 549 extern struct buffer_head * breada(kdev_t dev,int block, int size, 
 550                                    unsigned int pos, unsigned int filesize);
 551 extern void put_super(kdev_t dev);
 552 unsigned long generate_cluster(kdev_t dev, int b[], int size);
 553 extern kdev_t ROOT_DEV;
 554 
 555 extern void show_buffers(void);
 556 extern void mount_root(void);
 557 
 558 extern int char_read(struct inode *, struct file *, char *, int);
 559 extern int block_read(struct inode *, struct file *, char *, int);
 560 extern int read_ahead[];
 561 
 562 extern int char_write(struct inode *, struct file *, const char *, int);
 563 extern int block_write(struct inode *, struct file *, const char *, int);
 564 
 565 extern int generic_mmap(struct inode *, struct file *, struct vm_area_struct *);
 566 
 567 extern int block_fsync(struct inode *, struct file *);
 568 extern int file_fsync(struct inode *, struct file *);
 569 
 570 extern void dcache_add(struct inode *, const char *, int, unsigned long);
 571 extern int dcache_lookup(struct inode *, const char *, int, unsigned long *);
 572 
 573 extern int inode_change_ok(struct inode *, struct iattr *);
 574 extern void inode_setattr(struct inode *, struct iattr *);
 575 
 576 extern inline struct inode * iget(struct super_block * sb,int nr)
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 577 {
 578         return __iget(sb,nr,1);
 579 }
 580 
 581 #endif /* __KERNEL__ */
 582 
 583 #endif

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