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. buffer_protected
  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/config.h>
  10 #include <linux/linkage.h>
  11 #include <linux/limits.h>
  12 #include <linux/wait.h>
  13 #include <linux/types.h>
  14 #include <linux/vfs.h>
  15 #include <linux/net.h>
  16 #include <linux/kdev_t.h>
  17 #include <linux/ioctl.h>
  18 
  19 /*
  20  * It's silly to have NR_OPEN bigger than NR_FILE, but I'll fix
  21  * that later. Anyway, now the file code is no longer dependent
  22  * on bitmaps in unsigned longs, but uses the new fd_set structure..
  23  *
  24  * Some programs (notably those using select()) may have to be 
  25  * recompiled to take full advantage of the new limits..
  26  */
  27 
  28 /* Fixed constants first: */
  29 #undef NR_OPEN
  30 #define NR_OPEN 256
  31 
  32 #define NR_SUPER 64
  33 #define BLOCK_SIZE 1024
  34 #define BLOCK_SIZE_BITS 10
  35 
  36 /* And dynamically-tunable limits and defaults: */
  37 extern int max_inodes, nr_inodes;
  38 extern int max_files, nr_files;
  39 #define NR_INODE 2048   /* this should be bigger than NR_FILE */
  40 #define NR_FILE 1024    /* this can well be larger on a larger system */
  41 
  42 #define MAY_EXEC 1
  43 #define MAY_WRITE 2
  44 #define MAY_READ 4
  45 
  46 #define FMODE_READ 1
  47 #define FMODE_WRITE 2
  48 
  49 #define READ 0
  50 #define WRITE 1
  51 #define READA 2         /* read-ahead - don't pause */
  52 #define WRITEA 3        /* "write-ahead" - silly, but somewhat useful */
  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_SYNCHRONOUS  16      /* Writes are synced at once */
  71 #define MS_REMOUNT      32      /* Alter flags of a mounted FS */
  72 #define S_WRITE         128     /* Write on file/directory/symlink */
  73 #define S_APPEND        256     /* Append-only file */
  74 #define S_IMMUTABLE     512     /* Immutable file */
  75 
  76 /*
  77  * Flags that can be altered by MS_REMOUNT
  78  */
  79 #define MS_RMT_MASK (MS_RDONLY)
  80 
  81 /*
  82  * Magic mount flag number. Has to be or-ed to the flag values.
  83  */
  84 #define MS_MGC_VAL 0xC0ED0000   /* magic flag number to indicate "new" flags */
  85 #define MS_MGC_MSK 0xffff0000   /* magic flag number mask */
  86 
  87 /*
  88  * Note that read-only etc flags are inode-specific: setting some file-system
  89  * flags just means all the inodes inherit those flags by default. It might be
  90  * possible to override it selectively if you really wanted to with some
  91  * ioctl() that is not currently implemented.
  92  *
  93  * Exception: MS_RDONLY is always applied to the entire file system.
  94  */
  95 #define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY))
  96 #define IS_NOSUID(inode) ((inode)->i_flags & MS_NOSUID)
  97 #define IS_NODEV(inode) ((inode)->i_flags & MS_NODEV)
  98 #define IS_NOEXEC(inode) ((inode)->i_flags & MS_NOEXEC)
  99 #define IS_SYNC(inode) ((inode)->i_flags & MS_SYNCHRONOUS)
 100 
 101 #define IS_WRITABLE(inode) ((inode)->i_flags & S_WRITE)
 102 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
 103 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
 104 
 105 /* the read-only stuff doesn't really belong here, but any other place is
 106    probably as bad and I don't want to create yet another include file. */
 107 
 108 #define BLKROSET   _IO(0x12,93) /* set device read-only (0 = read-write) */
 109 #define BLKROGET   _IO(0x12,94) /* get read-only status (0 = read_write) */
 110 #define BLKRRPART  _IO(0x12,95) /* re-read partition table */
 111 #define BLKGETSIZE _IO(0x12,96) /* return device size */
 112 #define BLKFLSBUF  _IO(0x12,97) /* flush buffer cache */
 113 #define BLKRASET   _IO(0x12,98) /* Set read ahead for block device */
 114 #define BLKRAGET   _IO(0x12,99) /* get current read ahead setting */
 115 
 116 #define BMAP_IOCTL 1            /* obsolete - kept for compatibility */
 117 #define FIBMAP     _IO(0x00,1)  /* bmap access */
 118 #define FIGETBSZ   _IO(0x00,2)  /* get the block size used for bmap */
 119 
 120 #ifdef __KERNEL__
 121 
 122 #include <asm/bitops.h>
 123 
 124 extern void buffer_init(void);
 125 extern unsigned long inode_init(unsigned long start, unsigned long end);
 126 extern unsigned long file_table_init(unsigned long start, unsigned long end);
 127 extern unsigned long name_cache_init(unsigned long start, unsigned long end);
 128 
 129 typedef char buffer_block[BLOCK_SIZE];
 130 
 131 /* bh state bits */
 132 #define BH_Uptodate     0       /* 1 if the buffer contains valid data */
 133 #define BH_Dirty        1       /* 1 if the buffer is dirty */
 134 #define BH_Lock         2       /* 1 if the buffer is locked */
 135 #define BH_Req          3       /* 0 if the buffer has been invalidated */
 136 #define BH_Touched      4       /* 1 if the buffer has been touched (aging) */
 137 #define BH_Has_aged     5       /* 1 if the buffer has been aged (aging) */
 138 #define BH_Protected    6       /* 1 if the buffer is protected */
 139 #define BH_FreeOnIO     7       /* 1 to discard the buffer_head after IO */
 140 
 141 /*
 142  * Try to keep the most commonly used fields in single cache lines (16
 143  * bytes) to improve performance.  This ordering should be
 144  * particularly beneficial on 32-bit processors.
 145  * 
 146  * We use the first 16 bytes for the data which is used in searches
 147  * over the block hash lists (ie. getblk(), find_buffer() and
 148  * friends).
 149  * 
 150  * The second 16 bytes we use for lru buffer scans, as used by
 151  * sync_buffers() and refill_freelist().  -- sct
 152  */
 153 struct buffer_head {
 154         /* First cache line: */
 155         unsigned long b_blocknr;        /* block number */
 156         kdev_t b_dev;                   /* device (B_FREE = free) */
 157         kdev_t b_rdev;                  /* Real device */
 158         struct buffer_head * b_next;    /* Hash queue list */
 159         struct buffer_head * b_this_page;       /* circular list of buffers in one page */
 160 
 161         /* Second cache line: */
 162         unsigned long b_state;          /* buffer state bitmap (see above) */
 163         struct buffer_head * b_next_free;
 164         unsigned int b_count;           /* users using this block */
 165         unsigned long b_size;           /* block size */
 166 
 167         /* Non-performance-critical data follows. */
 168         char * b_data;                  /* pointer to data block (1024 bytes) */
 169         unsigned int b_list;            /* List that this buffer appears */
 170         unsigned long b_flushtime;      /* Time when this (dirty) buffer
 171                                          * should be written */
 172         unsigned long b_lru_time;       /* Time when this buffer was 
 173                                          * last used. */
 174         struct wait_queue * b_wait;
 175         struct buffer_head * b_prev;            /* doubly linked list of hash-queue */
 176         struct buffer_head * b_prev_free;       /* doubly linked list of buffers */
 177         struct buffer_head * b_reqnext;         /* request queue */
 178 };
 179 
 180 static inline int buffer_uptodate(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 181 {
 182         return test_bit(BH_Uptodate, &bh->b_state);
 183 }       
 184 
 185 static inline int buffer_dirty(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 186 {
 187         return test_bit(BH_Dirty, &bh->b_state);
 188 }
 189 
 190 static inline int buffer_locked(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 191 {
 192         return test_bit(BH_Lock, &bh->b_state);
 193 }
 194 
 195 static inline int buffer_req(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 196 {
 197         return test_bit(BH_Req, &bh->b_state);
 198 }
 199 
 200 static inline int buffer_touched(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 201 {
 202         return test_bit(BH_Touched, &bh->b_state);
 203 }
 204 
 205 static inline int buffer_has_aged(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 206 {
 207         return test_bit(BH_Has_aged, &bh->b_state);
 208 }
 209 
 210 static inline int buffer_protected(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 211 {
 212         return test_bit(BH_Protected, &bh->b_state);
 213 }
 214 
 215 #include <linux/pipe_fs_i.h>
 216 #include <linux/minix_fs_i.h>
 217 #include <linux/ext_fs_i.h>
 218 #include <linux/ext2_fs_i.h>
 219 #include <linux/hpfs_fs_i.h>
 220 #include <linux/msdos_fs_i.h>
 221 #include <linux/umsdos_fs_i.h>
 222 #include <linux/iso_fs_i.h>
 223 #include <linux/nfs_fs_i.h>
 224 #include <linux/xia_fs_i.h>
 225 #include <linux/sysv_fs_i.h>
 226 
 227 /*
 228  * Attribute flags.  These should be or-ed together to figure out what
 229  * has been changed!
 230  */
 231 #define ATTR_MODE       1
 232 #define ATTR_UID        2
 233 #define ATTR_GID        4
 234 #define ATTR_SIZE       8
 235 #define ATTR_ATIME      16
 236 #define ATTR_MTIME      32
 237 #define ATTR_CTIME      64
 238 #define ATTR_ATIME_SET  128
 239 #define ATTR_MTIME_SET  256
 240 #define ATTR_FORCE      512     /* Not a change, but a change it */
 241 
 242 /*
 243  * This is the Inode Attributes structure, used for notify_change().  It
 244  * uses the above definitions as flags, to know which values have changed.
 245  * Also, in this manner, a Filesystem can look at only the values it cares
 246  * about.  Basically, these are the attributes that the VFS layer can
 247  * request to change from the FS layer.
 248  *
 249  * Derek Atkins <warlord@MIT.EDU> 94-10-20
 250  */
 251 struct iattr {
 252         unsigned int    ia_valid;
 253         umode_t         ia_mode;
 254         uid_t           ia_uid;
 255         gid_t           ia_gid;
 256         off_t           ia_size;
 257         time_t          ia_atime;
 258         time_t          ia_mtime;
 259         time_t          ia_ctime;
 260 };
 261 
 262 #include <linux/quota.h>
 263 
 264 struct inode {
 265         kdev_t          i_dev;
 266         unsigned long   i_ino;
 267         umode_t         i_mode;
 268         nlink_t         i_nlink;
 269         uid_t           i_uid;
 270         gid_t           i_gid;
 271         kdev_t          i_rdev;
 272         off_t           i_size;
 273         time_t          i_atime;
 274         time_t          i_mtime;
 275         time_t          i_ctime;
 276         unsigned long   i_blksize;
 277         unsigned long   i_blocks;
 278         unsigned long   i_version;
 279         unsigned long   i_nrpages;
 280         struct semaphore i_sem;
 281         struct inode_operations *i_op;
 282         struct super_block *i_sb;
 283         struct wait_queue *i_wait;
 284         struct file_lock *i_flock;
 285         struct vm_area_struct *i_mmap;
 286         struct page *i_pages;
 287         struct dquot *i_dquot[MAXQUOTAS];
 288         struct inode *i_next, *i_prev;
 289         struct inode *i_hash_next, *i_hash_prev;
 290         struct inode *i_bound_to, *i_bound_by;
 291         struct inode *i_mount;
 292         unsigned short i_count;
 293         unsigned short i_flags;
 294         unsigned char i_lock;
 295         unsigned char i_dirt;
 296         unsigned char i_pipe;
 297         unsigned char i_sock;
 298         unsigned char i_seek;
 299         unsigned char i_update;
 300         unsigned short i_writecount;
 301         union {
 302                 struct pipe_inode_info pipe_i;
 303                 struct minix_inode_info minix_i;
 304                 struct ext_inode_info ext_i;
 305                 struct ext2_inode_info ext2_i;
 306                 struct hpfs_inode_info hpfs_i;
 307                 struct msdos_inode_info msdos_i;
 308                 struct umsdos_inode_info umsdos_i;
 309                 struct iso_inode_info isofs_i;
 310                 struct nfs_inode_info nfs_i;
 311                 struct xiafs_inode_info xiafs_i;
 312                 struct sysv_inode_info sysv_i;
 313                 struct socket socket_i;
 314                 void * generic_ip;
 315         } u;
 316 };
 317 
 318 struct file {
 319         mode_t f_mode;
 320         loff_t f_pos;
 321         unsigned short f_flags;
 322         unsigned short f_count;
 323         off_t f_reada;
 324         struct file *f_next, *f_prev;
 325         int f_owner;            /* pid or -pgrp where SIGIO should be sent */
 326         struct inode * f_inode;
 327         struct file_operations * f_op;
 328         unsigned long f_version;
 329         void *private_data;     /* needed for tty driver, and maybe others */
 330 };
 331 
 332 struct file_lock {
 333         struct file_lock *fl_next;      /* singly linked list for this inode  */
 334         struct file_lock *fl_nextlink;  /* doubly linked list of all locks */
 335         struct file_lock *fl_prevlink;  /* used to simplify lock removal */
 336         struct file_lock *fl_block;
 337         struct task_struct *fl_owner;
 338         struct wait_queue *fl_wait;
 339         struct file *fl_file;
 340         char fl_flags;
 341         char fl_type;
 342         off_t fl_start;
 343         off_t fl_end;
 344 };
 345 
 346 struct fasync_struct {
 347         int    magic;
 348         struct fasync_struct    *fa_next; /* singly linked list */
 349         struct file             *fa_file;
 350 };
 351 
 352 #define FASYNC_MAGIC 0x4601
 353 
 354 extern int fasync_helper(struct inode *, struct file *, int, struct fasync_struct **);
 355 
 356 #include <linux/minix_fs_sb.h>
 357 #include <linux/ext_fs_sb.h>
 358 #include <linux/ext2_fs_sb.h>
 359 #include <linux/hpfs_fs_sb.h>
 360 #include <linux/msdos_fs_sb.h>
 361 #include <linux/iso_fs_sb.h>
 362 #include <linux/nfs_fs_sb.h>
 363 #include <linux/xia_fs_sb.h>
 364 #include <linux/sysv_fs_sb.h>
 365 
 366 struct super_block {
 367         kdev_t s_dev;
 368         unsigned long s_blocksize;
 369         unsigned char s_blocksize_bits;
 370         unsigned char s_lock;
 371         unsigned char s_rd_only;
 372         unsigned char s_dirt;
 373         struct file_system_type *s_type;
 374         struct super_operations *s_op;
 375         struct dquot_operations *dq_op;
 376         unsigned long s_flags;
 377         unsigned long s_magic;
 378         unsigned long s_time;
 379         struct inode * s_covered;
 380         struct inode * s_mounted;
 381         struct wait_queue * s_wait;
 382         union {
 383                 struct minix_sb_info minix_sb;
 384                 struct ext_sb_info ext_sb;
 385                 struct ext2_sb_info ext2_sb;
 386                 struct hpfs_sb_info hpfs_sb;
 387                 struct msdos_sb_info msdos_sb;
 388                 struct isofs_sb_info isofs_sb;
 389                 struct nfs_sb_info nfs_sb;
 390                 struct xiafs_sb_info xiafs_sb;
 391                 struct sysv_sb_info sysv_sb;
 392                 void *generic_sbp;
 393         } u;
 394 };
 395 
 396 /*
 397  * This is the "filldir" function type, used by readdir() to let
 398  * the kernel specify what kind of dirent layout it wants to have.
 399  * This allows the kernel to read directories into kernel space or
 400  * to have different dirent layouts depending on the binary type.
 401  */
 402 typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t);
 403         
 404 struct file_operations {
 405         int (*lseek) (struct inode *, struct file *, off_t, int);
 406         int (*read) (struct inode *, struct file *, char *, int);
 407         int (*write) (struct inode *, struct file *, const char *, int);
 408         int (*readdir) (struct inode *, struct file *, void *, filldir_t);
 409         int (*select) (struct inode *, struct file *, int, select_table *);
 410         int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
 411         int (*mmap) (struct inode *, struct file *, struct vm_area_struct *);
 412         int (*open) (struct inode *, struct file *);
 413         void (*release) (struct inode *, struct file *);
 414         int (*fsync) (struct inode *, struct file *);
 415         int (*fasync) (struct inode *, struct file *, int);
 416         int (*check_media_change) (kdev_t dev);
 417         int (*revalidate) (kdev_t dev);
 418 };
 419 
 420 struct inode_operations {
 421         struct file_operations * default_file_ops;
 422         int (*create) (struct inode *,const char *,int,int,struct inode **);
 423         int (*lookup) (struct inode *,const char *,int,struct inode **);
 424         int (*link) (struct inode *,struct inode *,const char *,int);
 425         int (*unlink) (struct inode *,const char *,int);
 426         int (*symlink) (struct inode *,const char *,int,const char *);
 427         int (*mkdir) (struct inode *,const char *,int,int);
 428         int (*rmdir) (struct inode *,const char *,int);
 429         int (*mknod) (struct inode *,const char *,int,int,int);
 430         int (*rename) (struct inode *,const char *,int,struct inode *,const char *,int);
 431         int (*readlink) (struct inode *,char *,int);
 432         int (*follow_link) (struct inode *,struct inode *,int,int,struct inode **);
 433         int (*readpage) (struct inode *, struct page *);
 434         int (*writepage) (struct inode *, struct page *);
 435         int (*bmap) (struct inode *,int);
 436         void (*truncate) (struct inode *);
 437         int (*permission) (struct inode *, int);
 438         int (*smap) (struct inode *,int);
 439 };
 440 
 441 struct super_operations {
 442         void (*read_inode) (struct inode *);
 443         int (*notify_change) (struct inode *, struct iattr *);
 444         void (*write_inode) (struct inode *);
 445         void (*put_inode) (struct inode *);
 446         void (*put_super) (struct super_block *);
 447         void (*write_super) (struct super_block *);
 448         void (*statfs) (struct super_block *, struct statfs *, int);
 449         int (*remount_fs) (struct super_block *, int *, char *);
 450 };
 451 
 452 struct dquot_operations {
 453         void (*initialize) (struct inode *, short);
 454         void (*drop) (struct inode *);
 455         int (*alloc_block) (const struct inode *, unsigned long);
 456         int (*alloc_inode) (const struct inode *, unsigned long);
 457         void (*free_block) (const struct inode *, unsigned long);
 458         void (*free_inode) (const struct inode *, unsigned long);
 459         int (*transfer) (struct inode *, struct iattr *, char);
 460 };
 461 
 462 struct file_system_type {
 463         struct super_block *(*read_super) (struct super_block *, void *, int);
 464         const char *name;
 465         int requires_dev;
 466         struct file_system_type * next;
 467 };
 468 
 469 extern int register_filesystem(struct file_system_type *);
 470 extern int unregister_filesystem(struct file_system_type *);
 471 
 472 asmlinkage int sys_open(const char *, int, int);
 473 asmlinkage int sys_close(unsigned int);         /* yes, it's really unsigned */
 474 
 475 extern void kill_fasync(struct fasync_struct *fa, int sig);
 476 
 477 extern int getname(const char * filename, char **result);
 478 extern void putname(char * name);
 479 extern int do_truncate(struct inode *, unsigned long);
 480 extern int register_blkdev(unsigned int, const char *, struct file_operations *);
 481 extern int unregister_blkdev(unsigned int major, const char * name);
 482 extern int blkdev_open(struct inode * inode, struct file * filp);
 483 extern void blkdev_release (struct inode * inode);
 484 extern struct file_operations def_blk_fops;
 485 extern struct inode_operations blkdev_inode_operations;
 486 
 487 extern int register_chrdev(unsigned int, const char *, struct file_operations *);
 488 extern int unregister_chrdev(unsigned int major, const char * name);
 489 extern int chrdev_open(struct inode * inode, struct file * filp);
 490 extern struct file_operations def_chr_fops;
 491 extern struct inode_operations chrdev_inode_operations;
 492 
 493 extern void init_fifo(struct inode * inode);
 494 extern struct inode_operations fifo_inode_operations;
 495 
 496 extern struct file_operations connecting_fifo_fops;
 497 extern struct file_operations read_fifo_fops;
 498 extern struct file_operations write_fifo_fops;
 499 extern struct file_operations rdwr_fifo_fops;
 500 extern struct file_operations read_pipe_fops;
 501 extern struct file_operations write_pipe_fops;
 502 extern struct file_operations rdwr_pipe_fops;
 503 
 504 extern struct file_system_type *get_fs_type(const char *name);
 505 
 506 extern int fs_may_mount(kdev_t dev);
 507 extern int fs_may_umount(kdev_t dev, struct inode * mount_root);
 508 extern int fs_may_remount_ro(kdev_t dev);
 509 
 510 extern struct file *first_file;
 511 extern struct super_block super_blocks[NR_SUPER];
 512 
 513 extern void refile_buffer(struct buffer_head * buf);
 514 extern void set_writetime(struct buffer_head * buf, int flag);
 515 extern void refill_freelist(int size);
 516 extern int try_to_free_buffer(struct buffer_head*, struct buffer_head**, int);
 517 
 518 extern int nr_buffers;
 519 extern int buffermem;
 520 extern int nr_buffer_heads;
 521 
 522 #define BUF_CLEAN 0
 523 #define BUF_UNSHARED 1 /* Buffers that were shared but are not any more */
 524 #define BUF_LOCKED 2   /* Buffers scheduled for write */
 525 #define BUF_LOCKED1 3  /* Supers, inodes */
 526 #define BUF_DIRTY 4    /* Dirty buffers, not yet scheduled for write */
 527 #define BUF_SHARED 5   /* Buffers shared */
 528 #define NR_LIST 6
 529 
 530 void mark_buffer_uptodate(struct buffer_head * bh, int on);
 531 
 532 extern inline void mark_buffer_clean(struct buffer_head * bh)
     /* [previous][next][first][last][top][bottom][index][help] */
 533 {
 534         if (clear_bit(BH_Dirty, &bh->b_state)) {
 535                 if (bh->b_list == BUF_DIRTY)
 536                         refile_buffer(bh);
 537         }
 538 }
 539 
 540 extern inline void mark_buffer_dirty(struct buffer_head * bh, int flag)
     /* [previous][next][first][last][top][bottom][index][help] */
 541 {
 542         if (!set_bit(BH_Dirty, &bh->b_state)) {
 543                 set_writetime(bh, flag);
 544                 if (bh->b_list != BUF_DIRTY)
 545                         refile_buffer(bh);
 546         }
 547 }
 548 
 549 extern int check_disk_change(kdev_t dev);
 550 extern void invalidate_inodes(kdev_t dev);
 551 extern void invalidate_inode_pages(struct inode *);
 552 extern void invalidate_buffers(kdev_t dev);
 553 extern int floppy_is_wp(int minor);
 554 extern void sync_inodes(kdev_t dev);
 555 extern void sync_dev(kdev_t dev);
 556 extern int fsync_dev(kdev_t dev);
 557 extern void sync_supers(kdev_t dev);
 558 extern int bmap(struct inode * inode,int block);
 559 extern int notify_change(struct inode *, struct iattr *);
 560 extern int namei(const char * pathname, struct inode ** res_inode);
 561 extern int lnamei(const char * pathname, struct inode ** res_inode);
 562 extern int permission(struct inode * inode,int mask);
 563 extern int get_write_access(struct inode *inode);
 564 extern void put_write_access(struct inode *inode);
 565 extern int open_namei(const char * pathname, int flag, int mode,
 566         struct inode ** res_inode, struct inode * base);
 567 extern int do_mknod(const char * filename, int mode, dev_t dev);
 568 extern int do_pipe(int *);
 569 extern void iput(struct inode * inode);
 570 extern struct inode * __iget(struct super_block * sb,int nr,int crsmnt);
 571 extern struct inode * get_empty_inode(void);
 572 extern void insert_inode_hash(struct inode *);
 573 extern void clear_inode(struct inode *);
 574 extern struct inode * get_pipe_inode(void);
 575 extern struct file * get_empty_filp(void);
 576 extern int close_fp(struct file *filp);
 577 extern struct buffer_head * get_hash_table(kdev_t dev, int block, int size);
 578 extern struct buffer_head * getblk(kdev_t dev, int block, int size);
 579 extern void ll_rw_block(int rw, int nr, struct buffer_head * bh[]);
 580 extern void ll_rw_page(int rw, kdev_t dev, unsigned long nr, char * buffer);
 581 extern void ll_rw_swap_file(int rw, kdev_t dev, unsigned int *b, int nb, char *buffer);
 582 extern int is_read_only(kdev_t dev);
 583 extern void __brelse(struct buffer_head *buf);
 584 extern inline void brelse(struct buffer_head *buf)
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 585 {
 586         if (buf)
 587                 __brelse(buf);
 588 }
 589 extern void __bforget(struct buffer_head *buf);
 590 extern inline void bforget(struct buffer_head *buf)
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 591 {
 592         if (buf)
 593                 __bforget(buf);
 594 }
 595 extern void set_blocksize(kdev_t dev, int size);
 596 extern struct buffer_head * bread(kdev_t dev, int block, int size);
 597 extern struct buffer_head * breada(kdev_t dev,int block, int size, 
 598                                    unsigned int pos, unsigned int filesize);
 599 
 600 extern int generic_readpage(struct inode *, struct page *);
 601 extern int generic_file_read(struct inode *, struct file *, char *, int);
 602 extern int generic_file_mmap(struct inode *, struct file *, struct vm_area_struct *);
 603 extern int brw_page(int, unsigned long, kdev_t, int [], int, int);
 604 
 605 extern void put_super(kdev_t dev);
 606 unsigned long generate_cluster(kdev_t dev, int b[], int size);
 607 extern kdev_t ROOT_DEV;
 608 
 609 extern void show_buffers(void);
 610 extern void mount_root(void);
 611 
 612 #ifdef CONFIG_BLK_DEV_INITRD
 613 extern kdev_t real_root_dev;
 614 extern int change_root(kdev_t new_root_dev,const char *put_old);
 615 #endif
 616 
 617 extern int char_read(struct inode *, struct file *, char *, int);
 618 extern int block_read(struct inode *, struct file *, char *, int);
 619 extern int read_ahead[];
 620 
 621 extern int char_write(struct inode *, struct file *, const char *, int);
 622 extern int block_write(struct inode *, struct file *, const char *, int);
 623 
 624 extern int block_fsync(struct inode *, struct file *);
 625 extern int file_fsync(struct inode *, struct file *);
 626 
 627 extern void dcache_add(struct inode *, const char *, int, unsigned long);
 628 extern int dcache_lookup(struct inode *, const char *, int, unsigned long *);
 629 
 630 extern int inode_change_ok(struct inode *, struct iattr *);
 631 extern void inode_setattr(struct inode *, struct iattr *);
 632 
 633 extern inline struct inode * iget(struct super_block * sb,int nr)
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 634 {
 635         return __iget(sb, nr, 1);
 636 }
 637 
 638 /* kludge to get SCSI modules working */
 639 #include <linux/minix_fs.h>
 640 #include <linux/minix_fs_sb.h>
 641 
 642 #endif /* __KERNEL__ */
 643 
 644 #endif

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