root/include/linux/fs.h

/* */

INCLUDED FROM

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/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 /*
  19  * It's silly to have NR_OPEN bigger than NR_FILE, but I'll fix
  20  * that later. Anyway, now the file code is no longer dependent
  21  * on bitmaps in unsigned longs, but uses the new fd_set structure..
  22  *
  23  * Some programs (notably those using select()) may have to be 
  24  * recompiled to take full advantage of the new limits..
  25  */
  26 
  27 /* Fixed constants first: */
  28 #undef NR_OPEN
  29 #define NR_OPEN 256
  30 
  31 #define NR_SUPER 64
  32 #define NR_IHASH 131
  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         struct buffer_head * b_next;    /* Hash queue list */
 158         struct buffer_head * b_this_page;       /* circular list of buffers in one page */
 159 
 160         /* Second cache line: */
 161         unsigned long b_state;          /* buffer state bitmap (see above) */
 162         struct buffer_head * b_next_free;
 163         unsigned int b_count;           /* users using this block */
 164         unsigned long b_size;           /* block size */
 165 
 166         /* Non-performance-critical data follows. */
 167         char * b_data;                  /* pointer to data block (1024 bytes) */
 168         unsigned int b_list;            /* List that this buffer appears */
 169         unsigned long b_flushtime;      /* Time when this (dirty) buffer
 170                                          * should be written */
 171         unsigned long b_lru_time;       /* Time when this buffer was 
 172                                          * last used. */
 173         struct wait_queue * b_wait;
 174         struct buffer_head * b_prev;            /* doubly linked list of hash-queue */
 175         struct buffer_head * b_prev_free;       /* doubly linked list of buffers */
 176         struct buffer_head * b_reqnext;         /* request queue */
 177 };
 178 
 179 static inline int buffer_uptodate(struct buffer_head * bh)
     /*  */
 180 {
 181         return test_bit(BH_Uptodate, &bh->b_state);
 182 }       
 183 
 184 static inline int buffer_dirty(struct buffer_head * bh)
     /*  */
 185 {
 186         return test_bit(BH_Dirty, &bh->b_state);
 187 }
 188 
 189 static inline int buffer_locked(struct buffer_head * bh)
     /*  */
 190 {
 191         return test_bit(BH_Lock, &bh->b_state);
 192 }
 193 
 194 static inline int buffer_req(struct buffer_head * bh)
     /*  */
 195 {
 196         return test_bit(BH_Req, &bh->b_state);
 197 }
 198 
 199 static inline int buffer_touched(struct buffer_head * bh)
     /*  */
 200 {
 201         return test_bit(BH_Touched, &bh->b_state);
 202 }
 203 
 204 static inline int buffer_has_aged(struct buffer_head * bh)
     /*  */
 205 {
 206         return test_bit(BH_Has_aged, &bh->b_state);
 207 }
 208 
 209 static inline int buffer_protected(struct buffer_head * bh)
     /*  */
 210 {
 211         return test_bit(BH_Protected, &bh->b_state);
 212 }
 213 
 214 #include <linux/pipe_fs_i.h>
 215 #include <linux/minix_fs_i.h>
 216 #include <linux/ext_fs_i.h>
 217 #include <linux/ext2_fs_i.h>
 218 #include <linux/hpfs_fs_i.h>
 219 #include <linux/msdos_fs_i.h>
 220 #include <linux/umsdos_fs_i.h>
 221 #include <linux/iso_fs_i.h>
 222 #include <linux/nfs_fs_i.h>
 223 #include <linux/xia_fs_i.h>
 224 #include <linux/sysv_fs_i.h>
 225 
 226 /*
 227  * Attribute flags.  These should be or-ed together to figure out what
 228  * has been changed!
 229  */
 230 #define ATTR_MODE       1
 231 #define ATTR_UID        2
 232 #define ATTR_GID        4
 233 #define ATTR_SIZE       8
 234 #define ATTR_ATIME      16
 235 #define ATTR_MTIME      32
 236 #define ATTR_CTIME      64
 237 #define ATTR_ATIME_SET  128
 238 #define ATTR_MTIME_SET  256
 239 
 240 /*
 241  * This is the Inode Attributes structure, used for notify_change().  It
 242  * uses the above definitions as flags, to know which values have changed.
 243  * Also, in this manner, a Filesystem can look at only the values it cares
 244  * about.  Basically, these are the attributes that the VFS layer can
 245  * request to change from the FS layer.
 246  *
 247  * Derek Atkins <warlord@MIT.EDU> 94-10-20
 248  */
 249 struct iattr {
 250         unsigned int    ia_valid;
 251         umode_t         ia_mode;
 252         uid_t           ia_uid;
 253         gid_t           ia_gid;
 254         off_t           ia_size;
 255         time_t          ia_atime;
 256         time_t          ia_mtime;
 257         time_t          ia_ctime;
 258 };
 259 
 260 #include <linux/quota.h>
 261 
 262 struct inode {
 263         kdev_t          i_dev;
 264         unsigned long   i_ino;
 265         umode_t         i_mode;
 266         nlink_t         i_nlink;
 267         uid_t           i_uid;
 268         gid_t           i_gid;
 269         kdev_t          i_rdev;
 270         off_t           i_size;
 271         time_t          i_atime;
 272         time_t          i_mtime;
 273         time_t          i_ctime;
 274         unsigned long   i_blksize;
 275         unsigned long   i_blocks;
 276         unsigned long   i_version;
 277         unsigned long   i_nrpages;
 278         struct semaphore i_sem;
 279         struct inode_operations *i_op;
 280         struct super_block *i_sb;
 281         struct wait_queue *i_wait;
 282         struct file_lock *i_flock;
 283         struct vm_area_struct *i_mmap;
 284         struct page *i_pages;
 285         struct dquot *i_dquot[MAXQUOTAS];
 286         struct inode *i_next, *i_prev;
 287         struct inode *i_hash_next, *i_hash_prev;
 288         struct inode *i_bound_to, *i_bound_by;
 289         struct inode *i_mount;
 290         unsigned short i_count;
 291         unsigned short i_flags;
 292         unsigned char i_lock;
 293         unsigned char i_dirt;
 294         unsigned char i_pipe;
 295         unsigned char i_sock;
 296         unsigned char i_seek;
 297         unsigned char i_update;
 298         unsigned short i_writecount;
 299         union {
 300                 struct pipe_inode_info pipe_i;
 301                 struct minix_inode_info minix_i;
 302                 struct ext_inode_info ext_i;
 303                 struct ext2_inode_info ext2_i;
 304                 struct hpfs_inode_info hpfs_i;
 305                 struct msdos_inode_info msdos_i;
 306                 struct umsdos_inode_info umsdos_i;
 307                 struct iso_inode_info isofs_i;
 308                 struct nfs_inode_info nfs_i;
 309                 struct xiafs_inode_info xiafs_i;
 310                 struct sysv_inode_info sysv_i;
 311                 struct socket socket_i;
 312                 void * generic_ip;
 313         } u;
 314 };
 315 
 316 struct file {
 317         mode_t f_mode;
 318         loff_t f_pos;
 319         unsigned short f_flags;
 320         unsigned short f_count;
 321         off_t f_reada;
 322         struct file *f_next, *f_prev;
 323         int f_owner;            /* pid or -pgrp where SIGIO should be sent */
 324         struct inode * f_inode;
 325         struct file_operations * f_op;
 326         unsigned long f_version;
 327         void *private_data;     /* needed for tty driver, and maybe others */
 328 };
 329 
 330 struct file_lock {
 331         struct file_lock *fl_next;      /* singly linked list for this inode  */
 332         struct file_lock *fl_nextlink;  /* doubly linked list of all locks */
 333         struct file_lock *fl_prevlink;  /* used to simplify lock removal */
 334         struct file_lock *fl_block;
 335         struct task_struct *fl_owner;
 336         struct wait_queue *fl_wait;
 337         struct file *fl_file;
 338         char fl_flags;
 339         char fl_type;
 340         off_t fl_start;
 341         off_t fl_end;
 342 };
 343 
 344 struct fasync_struct {
 345         int    magic;
 346         struct fasync_struct    *fa_next; /* singly linked list */
 347         struct file             *fa_file;
 348 };
 349 
 350 #define FASYNC_MAGIC 0x4601
 351 
 352 extern int fasync_helper(struct inode *, struct file *, int, struct fasync_struct **);
 353 
 354 #include <linux/minix_fs_sb.h>
 355 #include <linux/ext_fs_sb.h>
 356 #include <linux/ext2_fs_sb.h>
 357 #include <linux/hpfs_fs_sb.h>
 358 #include <linux/msdos_fs_sb.h>
 359 #include <linux/iso_fs_sb.h>
 360 #include <linux/nfs_fs_sb.h>
 361 #include <linux/xia_fs_sb.h>
 362 #include <linux/sysv_fs_sb.h>
 363 
 364 struct super_block {
 365         kdev_t s_dev;
 366         unsigned long s_blocksize;
 367         unsigned char s_blocksize_bits;
 368         unsigned char s_lock;
 369         unsigned char s_rd_only;
 370         unsigned char s_dirt;
 371         struct file_system_type *s_type;
 372         struct super_operations *s_op;
 373         struct dquot_operations *dq_op;
 374         unsigned long s_flags;
 375         unsigned long s_magic;
 376         unsigned long s_time;
 377         struct inode * s_covered;
 378         struct inode * s_mounted;
 379         struct wait_queue * s_wait;
 380         union {
 381                 struct minix_sb_info minix_sb;
 382                 struct ext_sb_info ext_sb;
 383                 struct ext2_sb_info ext2_sb;
 384                 struct hpfs_sb_info hpfs_sb;
 385                 struct msdos_sb_info msdos_sb;
 386                 struct isofs_sb_info isofs_sb;
 387                 struct nfs_sb_info nfs_sb;
 388                 struct xiafs_sb_info xiafs_sb;
 389                 struct sysv_sb_info sysv_sb;
 390                 void *generic_sbp;
 391         } u;
 392 };
 393 
 394 /*
 395  * This is the "filldir" function type, used by readdir() to let
 396  * the kernel specify what kind of dirent layout it wants to have.
 397  * This allows the kernel to read directories into kernel space or
 398  * to have different dirent layouts depending on the binary type.
 399  */
 400 typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t);
 401         
 402 struct file_operations {
 403         int (*lseek) (struct inode *, struct file *, off_t, int);
 404         int (*read) (struct inode *, struct file *, char *, int);
 405         int (*write) (struct inode *, struct file *, const char *, int);
 406         int (*readdir) (struct inode *, struct file *, void *, filldir_t);
 407         int (*select) (struct inode *, struct file *, int, select_table *);
 408         int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
 409         int (*mmap) (struct inode *, struct file *, struct vm_area_struct *);
 410         int (*open) (struct inode *, struct file *);
 411         void (*release) (struct inode *, struct file *);
 412         int (*fsync) (struct inode *, struct file *);
 413         int (*fasync) (struct inode *, struct file *, int);
 414         int (*check_media_change) (kdev_t dev);
 415         int (*revalidate) (kdev_t dev);
 416 };
 417 
 418 struct inode_operations {
 419         struct file_operations * default_file_ops;
 420         int (*create) (struct inode *,const char *,int,int,struct inode **);
 421         int (*lookup) (struct inode *,const char *,int,struct inode **);
 422         int (*link) (struct inode *,struct inode *,const char *,int);
 423         int (*unlink) (struct inode *,const char *,int);
 424         int (*symlink) (struct inode *,const char *,int,const char *);
 425         int (*mkdir) (struct inode *,const char *,int,int);
 426         int (*rmdir) (struct inode *,const char *,int);
 427         int (*mknod) (struct inode *,const char *,int,int,int);
 428         int (*rename) (struct inode *,const char *,int,struct inode *,const char *,int);
 429         int (*readlink) (struct inode *,char *,int);
 430         int (*follow_link) (struct inode *,struct inode *,int,int,struct inode **);
 431         int (*readpage) (struct inode *, struct page *);
 432         int (*writepage) (struct inode *, struct page *);
 433         int (*bmap) (struct inode *,int);
 434         void (*truncate) (struct inode *);
 435         int (*permission) (struct inode *, int);
 436         int (*smap) (struct inode *,int);
 437 };
 438 
 439 struct super_operations {
 440         void (*read_inode) (struct inode *);
 441         int (*notify_change) (struct inode *, struct iattr *);
 442         void (*write_inode) (struct inode *);
 443         void (*put_inode) (struct inode *);
 444         void (*put_super) (struct super_block *);
 445         void (*write_super) (struct super_block *);
 446         void (*statfs) (struct super_block *, struct statfs *, int);
 447         int (*remount_fs) (struct super_block *, int *, char *);
 448 };
 449 
 450 struct dquot_operations {
 451         void (*initialize) (struct inode *, short);
 452         void (*drop) (struct inode *);
 453         int (*alloc_block) (const struct inode *, unsigned long);
 454         int (*alloc_inode) (const struct inode *, unsigned long);
 455         void (*free_block) (const struct inode *, unsigned long);
 456         void (*free_inode) (const struct inode *, unsigned long);
 457         int (*transfer) (struct inode *, struct iattr *, char);
 458 };
 459 
 460 struct file_system_type {
 461         struct super_block *(*read_super) (struct super_block *, void *, int);
 462         const char *name;
 463         int requires_dev;
 464         struct file_system_type * next;
 465 };
 466 
 467 extern int register_filesystem(struct file_system_type *);
 468 extern int unregister_filesystem(struct file_system_type *);
 469 
 470 asmlinkage int sys_open(const char *, int, int);
 471 asmlinkage int sys_close(unsigned int);         /* yes, it's really unsigned */
 472 
 473 extern void kill_fasync(struct fasync_struct *fa, int sig);
 474 
 475 extern int getname(const char * filename, char **result);
 476 extern void putname(char * name);
 477 extern int do_truncate(struct inode *, unsigned long);
 478 extern int register_blkdev(unsigned int, const char *, struct file_operations *);
 479 extern int unregister_blkdev(unsigned int major, const char * name);
 480 extern int blkdev_open(struct inode * inode, struct file * filp);
 481 extern struct file_operations def_blk_fops;
 482 extern struct inode_operations blkdev_inode_operations;
 483 
 484 extern int register_chrdev(unsigned int, const char *, struct file_operations *);
 485 extern int unregister_chrdev(unsigned int major, const char * name);
 486 extern int chrdev_open(struct inode * inode, struct file * filp);
 487 extern struct file_operations def_chr_fops;
 488 extern struct inode_operations chrdev_inode_operations;
 489 
 490 extern void init_fifo(struct inode * inode);
 491 
 492 extern struct file_operations connecting_fifo_fops;
 493 extern struct file_operations read_fifo_fops;
 494 extern struct file_operations write_fifo_fops;
 495 extern struct file_operations rdwr_fifo_fops;
 496 extern struct file_operations read_pipe_fops;
 497 extern struct file_operations write_pipe_fops;
 498 extern struct file_operations rdwr_pipe_fops;
 499 
 500 extern struct file_system_type *get_fs_type(const char *name);
 501 
 502 extern int fs_may_mount(kdev_t dev);
 503 extern int fs_may_umount(kdev_t dev, struct inode * mount_root);
 504 extern int fs_may_remount_ro(kdev_t dev);
 505 
 506 extern struct file *first_file;
 507 extern int nr_files;
 508 extern struct super_block super_blocks[NR_SUPER];
 509 
 510 extern void refile_buffer(struct buffer_head * buf);
 511 extern void set_writetime(struct buffer_head * buf, int flag);
 512 extern void refill_freelist(int size);
 513 extern int try_to_free_buffer(struct buffer_head*, struct buffer_head**, int);
 514 
 515 extern struct buffer_head ** buffer_pages;
 516 extern int nr_buffers;
 517 extern int buffermem;
 518 extern int nr_buffer_heads;
 519 
 520 #define BUF_CLEAN 0
 521 #define BUF_UNSHARED 1 /* Buffers that were shared but are not any more */
 522 #define BUF_LOCKED 2   /* Buffers scheduled for write */
 523 #define BUF_LOCKED1 3  /* Supers, inodes */
 524 #define BUF_DIRTY 4    /* Dirty buffers, not yet scheduled for write */
 525 #define BUF_SHARED 5   /* Buffers shared */
 526 #define NR_LIST 6
 527 
 528 void mark_buffer_uptodate(struct buffer_head * bh, int on);
 529 
 530 extern inline void mark_buffer_clean(struct buffer_head * bh)
     /*  */
 531 {
 532         if (clear_bit(BH_Dirty, &bh->b_state)) {
 533                 if (bh->b_list == BUF_DIRTY)
 534                         refile_buffer(bh);
 535         }
 536 }
 537 
 538 extern inline void mark_buffer_dirty(struct buffer_head * bh, int flag)
     /*  */
 539 {
 540         if (!set_bit(BH_Dirty, &bh->b_state)) {
 541                 set_writetime(bh, flag);
 542                 if (bh->b_list != BUF_DIRTY)
 543                         refile_buffer(bh);
 544         }
 545 }
 546 
 547 extern int check_disk_change(kdev_t dev);
 548 extern void invalidate_inodes(kdev_t dev);
 549 extern void invalidate_inode_pages(struct inode *, unsigned long);
 550 extern void invalidate_buffers(kdev_t dev);
 551 extern int floppy_is_wp(int minor);
 552 extern void sync_inodes(kdev_t dev);
 553 extern void sync_dev(kdev_t dev);
 554 extern int fsync_dev(kdev_t dev);
 555 extern void sync_supers(kdev_t dev);
 556 extern int bmap(struct inode * inode,int block);
 557 extern int notify_change(struct inode *, struct iattr *);
 558 extern int namei(const char * pathname, struct inode ** res_inode);
 559 extern int lnamei(const char * pathname, struct inode ** res_inode);
 560 extern int permission(struct inode * inode,int mask);
 561 extern int get_write_access(struct inode *inode);
 562 extern void put_write_access(struct inode *inode);
 563 extern int open_namei(const char * pathname, int flag, int mode,
 564         struct inode ** res_inode, struct inode * base);
 565 extern int do_mknod(const char * filename, int mode, dev_t dev);
 566 extern int do_pipe(int *);
 567 extern void iput(struct inode * inode);
 568 extern struct inode * __iget(struct super_block * sb,int nr,int crsmnt);
 569 extern struct inode * get_empty_inode(void);
 570 extern void insert_inode_hash(struct inode *);
 571 extern void clear_inode(struct inode *);
 572 extern struct inode * get_pipe_inode(void);
 573 extern struct file * get_empty_filp(void);
 574 extern int close_fp(struct file *filp);
 575 extern struct buffer_head * get_hash_table(kdev_t dev, int block, int size);
 576 extern struct buffer_head * getblk(kdev_t dev, int block, int size);
 577 extern void ll_rw_block(int rw, int nr, struct buffer_head * bh[]);
 578 extern void ll_rw_page(int rw, kdev_t dev, unsigned long nr, char * buffer);
 579 extern void ll_rw_swap_file(int rw, kdev_t dev, unsigned int *b, int nb, char *buffer);
 580 extern int is_read_only(kdev_t dev);
 581 extern void __brelse(struct buffer_head *buf);
 582 extern inline void brelse(struct buffer_head *buf)
     /*  */
 583 {
 584         if (buf)
 585                 __brelse(buf);
 586 }
 587 extern void __bforget(struct buffer_head *buf);
 588 extern inline void bforget(struct buffer_head *buf)
     /*  */
 589 {
 590         if (buf)
 591                 __bforget(buf);
 592 }
 593 extern void set_blocksize(kdev_t dev, int size);
 594 extern struct buffer_head * bread(kdev_t dev, int block, int size);
 595 extern struct buffer_head * breada(kdev_t dev,int block, int size, 
 596                                    unsigned int pos, unsigned int filesize);
 597 
 598 extern int generic_readpage(struct inode *, struct page *);
 599 extern int generic_file_read(struct inode *, struct file *, char *, int);
 600 extern int generic_mmap(struct inode *, struct file *, struct vm_area_struct *);
 601 
 602 extern void bwrite_page(unsigned long addr,kdev_t dev,int b[],int size);
 603 extern void put_super(kdev_t dev);
 604 unsigned long generate_cluster(kdev_t dev, int b[], int size);
 605 extern kdev_t ROOT_DEV;
 606 
 607 extern void show_buffers(void);
 608 extern void mount_root(void);
 609 
 610 extern int char_read(struct inode *, struct file *, char *, int);
 611 extern int block_read(struct inode *, struct file *, char *, int);
 612 extern int read_ahead[];
 613 
 614 extern int char_write(struct inode *, struct file *, const char *, int);
 615 extern int block_write(struct inode *, struct file *, const char *, int);
 616 
 617 extern int block_fsync(struct inode *, struct file *);
 618 extern int file_fsync(struct inode *, struct file *);
 619 
 620 extern void dcache_add(struct inode *, const char *, int, unsigned long);
 621 extern int dcache_lookup(struct inode *, const char *, int, unsigned long *);
 622 
 623 extern int inode_change_ok(struct inode *, struct iattr *);
 624 extern void inode_setattr(struct inode *, struct iattr *);
 625 
 626 extern inline struct inode * iget(struct super_block * sb,int nr)
     /*  */
 627 {
 628         return __iget(sb, nr, 1);
 629 }
 630 
 631 #endif /* __KERNEL__ */
 632 
 633 #endif

/* */