include/linux/fs.h

/* */
This source file includes following definitions.
buffer_uptodate
buffer_dirty
buffer_locked
buffer_req
buffer_touched
buffer_has_aged
buffer_protected
mark_buffer_clean
mark_buffer_dirty
brelse
bforget
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 NR_IHASH 131
  34 #define BLOCK_SIZE 1024
  35 #define BLOCK_SIZE_BITS 10
  36 
  37 /* And dynamically-tunable limits and defaults: */
  38 extern int max_inodes, nr_inodes;
  39 extern int max_files, nr_files;
  40 #define NR_INODE 2048   /* this should be bigger than NR_FILE */
  41 #define NR_FILE 1024    /* this can well be larger on a larger system */
  42 
  43 #define MAY_EXEC 1
  44 #define MAY_WRITE 2
  45 #define MAY_READ 4
  46 
  47 #define FMODE_READ 1
  48 #define FMODE_WRITE 2
  49 
  50 #define READ 0
  51 #define WRITE 1
  52 #define READA 2         /* read-ahead - don't pause */
  53 #define WRITEA 3        /* "write-ahead" - silly, but somewhat useful */
  54 
  55 #ifndef NULL
  56 #define NULL ((void *) 0)
  57 #endif
  58 
  59 #define NIL_FILP        ((struct file *)0)
  60 #define SEL_IN          1
  61 #define SEL_OUT         2
  62 #define SEL_EX          4
  63 
  64 /*
  65  * These are the fs-independent mount-flags: up to 16 flags are supported
  66  */
  67 #define MS_RDONLY        1      /* Mount read-only */
  68 #define MS_NOSUID        2      /* Ignore suid and sgid bits */
  69 #define MS_NODEV         4      /* Disallow access to device special files */
  70 #define MS_NOEXEC        8      /* Disallow program execution */
  71 #define MS_SYNCHRONOUS  16      /* Writes are synced at once */
  72 #define MS_REMOUNT      32      /* Alter flags of a mounted FS */
  73 #define S_WRITE         128     /* Write on file/directory/symlink */
  74 #define S_APPEND        256     /* Append-only file */
  75 #define S_IMMUTABLE     512     /* Immutable file */
  76 
  77 /*
  78  * Flags that can be altered by MS_REMOUNT
  79  */
  80 #define MS_RMT_MASK (MS_RDONLY)
  81 
  82 /*
  83  * Magic mount flag number. Has to be or-ed to the flag values.
  84  */
  85 #define MS_MGC_VAL 0xC0ED0000   /* magic flag number to indicate "new" flags */
  86 #define MS_MGC_MSK 0xffff0000   /* magic flag number mask */
  87 
  88 /*
  89  * Note that read-only etc flags are inode-specific: setting some file-system
  90  * flags just means all the inodes inherit those flags by default. It might be
  91  * possible to override it selectively if you really wanted to with some
  92  * ioctl() that is not currently implemented.
  93  *
  94  * Exception: MS_RDONLY is always applied to the entire file system.
  95  */
  96 #define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY))
  97 #define IS_NOSUID(inode) ((inode)->i_flags & MS_NOSUID)
  98 #define IS_NODEV(inode) ((inode)->i_flags & MS_NODEV)
  99 #define IS_NOEXEC(inode) ((inode)->i_flags & MS_NOEXEC)
 100 #define IS_SYNC(inode) ((inode)->i_flags & MS_SYNCHRONOUS)
 101 
 102 #define IS_WRITABLE(inode) ((inode)->i_flags & S_WRITE)
 103 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
 104 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
 105 
 106 /* the read-only stuff doesn't really belong here, but any other place is
 107    probably as bad and I don't want to create yet another include file. */
 108 
 109 #define BLKROSET   _IO(0x12,93) /* set device read-only (0 = read-write) */
 110 #define BLKROGET   _IO(0x12,94) /* get read-only status (0 = read_write) */
 111 #define BLKRRPART  _IO(0x12,95) /* re-read partition table */
 112 #define BLKGETSIZE _IO(0x12,96) /* return device size */
 113 #define BLKFLSBUF  _IO(0x12,97) /* flush buffer cache */
 114 #define BLKRASET   _IO(0x12,98) /* Set read ahead for block device */
 115 #define BLKRAGET   _IO(0x12,99) /* get current read ahead setting */
 116 
 117 #define BMAP_IOCTL 1            /* obsolete - kept for compatibility */
 118 #define FIBMAP     _IO(0x00,1)  /* bmap access */
 119 #define FIGETBSZ   _IO(0x00,2)  /* get the block size used for bmap */
 120 
 121 #ifdef __KERNEL__
 122 
 123 #include <asm/bitops.h>
 124 
 125 extern void buffer_init(void);
 126 extern unsigned long inode_init(unsigned long start, unsigned long end);
 127 extern unsigned long file_table_init(unsigned long start, unsigned long end);
 128 extern unsigned long name_cache_init(unsigned long start, unsigned long end);
 129 
 130 typedef char buffer_block[BLOCK_SIZE];
 131 
 132 /* bh state bits */
 133 #define BH_Uptodate     0       /* 1 if the buffer contains valid data */
 134 #define BH_Dirty        1       /* 1 if the buffer is dirty */
 135 #define BH_Lock         2       /* 1 if the buffer is locked */
 136 #define BH_Req          3       /* 0 if the buffer has been invalidated */
 137 #define BH_Touched      4       /* 1 if the buffer has been touched (aging) */
 138 #define BH_Has_aged     5       /* 1 if the buffer has been aged (aging) */
 139 #define BH_Protected    6       /* 1 if the buffer is protected */
 140 #define BH_FreeOnIO     7       /* 1 to discard the buffer_head after IO */
 141 
 142 /*
 143  * Try to keep the most commonly used fields in single cache lines (16
 144  * bytes) to improve performance.  This ordering should be
 145  * particularly beneficial on 32-bit processors.
 146  * 
 147  * We use the first 16 bytes for the data which is used in searches
 148  * over the block hash lists (ie. getblk(), find_buffer() and
 149  * friends).
 150  * 
 151  * The second 16 bytes we use for lru buffer scans, as used by
 152  * sync_buffers() and refill_freelist().  -- sct
 153  */
 154 struct buffer_head {
 155         /* First cache line: */
 156         unsigned long b_blocknr;        /* block number */
 157         kdev_t b_dev;                   /* device (B_FREE = free) */
 158         kdev_t b_rdev;                  /* Real device */
 159         struct buffer_head * b_next;    /* Hash queue list */
 160         struct buffer_head * b_this_page;       /* circular list of buffers in one page */
 161 
 162         /* Second cache line: */
 163         unsigned long b_state;          /* buffer state bitmap (see above) */
 164         struct buffer_head * b_next_free;
 165         unsigned int b_count;           /* users using this block */
 166         unsigned long b_size;           /* block size */
 167 
 168         /* Non-performance-critical data follows. */
 169         char * b_data;                  /* pointer to data block (1024 bytes) */
 170         unsigned int b_list;            /* List that this buffer appears */
 171         unsigned long b_flushtime;      /* Time when this (dirty) buffer
 172                                          * should be written */
 173         unsigned long b_lru_time;       /* Time when this buffer was 
 174                                          * last used. */
 175         struct wait_queue * b_wait;
 176         struct buffer_head * b_prev;            /* doubly linked list of hash-queue */
 177         struct buffer_head * b_prev_free;       /* doubly linked list of buffers */
 178         struct buffer_head * b_reqnext;         /* request queue */
 179 };
 180 
 181 static inline int buffer_uptodate(struct buffer_head * bh)
     /*  */
 182 {
 183         return test_bit(BH_Uptodate, &bh->b_state);
 184 }       
 185 
 186 static inline int buffer_dirty(struct buffer_head * bh)
     /*  */
 187 {
 188         return test_bit(BH_Dirty, &bh->b_state);
 189 }
 190 
 191 static inline int buffer_locked(struct buffer_head * bh)
     /*  */
 192 {
 193         return test_bit(BH_Lock, &bh->b_state);
 194 }
 195 
 196 static inline int buffer_req(struct buffer_head * bh)
     /*  */
 197 {
 198         return test_bit(BH_Req, &bh->b_state);
 199 }
 200 
 201 static inline int buffer_touched(struct buffer_head * bh)
     /*  */
 202 {
 203         return test_bit(BH_Touched, &bh->b_state);
 204 }
 205 
 206 static inline int buffer_has_aged(struct buffer_head * bh)
     /*  */
 207 {
 208         return test_bit(BH_Has_aged, &bh->b_state);
 209 }
 210 
 211 static inline int buffer_protected(struct buffer_head * bh)
     /*  */
 212 {
 213         return test_bit(BH_Protected, &bh->b_state);
 214 }
 215 
 216 #include <linux/pipe_fs_i.h>
 217 #include <linux/minix_fs_i.h>
 218 #include <linux/ext_fs_i.h>
 219 #include <linux/ext2_fs_i.h>
 220 #include <linux/hpfs_fs_i.h>
 221 #include <linux/msdos_fs_i.h>
 222 #include <linux/umsdos_fs_i.h>
 223 #include <linux/iso_fs_i.h>
 224 #include <linux/nfs_fs_i.h>
 225 #include <linux/xia_fs_i.h>
 226 #include <linux/sysv_fs_i.h>
 227 
 228 /*
 229  * Attribute flags.  These should be or-ed together to figure out what
 230  * has been changed!
 231  */
 232 #define ATTR_MODE       1
 233 #define ATTR_UID        2
 234 #define ATTR_GID        4
 235 #define ATTR_SIZE       8
 236 #define ATTR_ATIME      16
 237 #define ATTR_MTIME      32
 238 #define ATTR_CTIME      64
 239 #define ATTR_ATIME_SET  128
 240 #define ATTR_MTIME_SET  256
 241 #define ATTR_FORCE      512     /* Not a change, but a change it */
 242 
 243 /*
 244  * This is the Inode Attributes structure, used for notify_change().  It
 245  * uses the above definitions as flags, to know which values have changed.
 246  * Also, in this manner, a Filesystem can look at only the values it cares
 247  * about.  Basically, these are the attributes that the VFS layer can
 248  * request to change from the FS layer.
 249  *
 250  * Derek Atkins <warlord@MIT.EDU> 94-10-20
 251  */
 252 struct iattr {
 253         unsigned int    ia_valid;
 254         umode_t         ia_mode;
 255         uid_t           ia_uid;
 256         gid_t           ia_gid;
 257         off_t           ia_size;
 258         time_t          ia_atime;
 259         time_t          ia_mtime;
 260         time_t          ia_ctime;
 261 };
 262 
 263 #include <linux/quota.h>
 264 
 265 struct inode {
 266         kdev_t          i_dev;
 267         unsigned long   i_ino;
 268         umode_t         i_mode;
 269         nlink_t         i_nlink;
 270         uid_t           i_uid;
 271         gid_t           i_gid;
 272         kdev_t          i_rdev;
 273         off_t           i_size;
 274         time_t          i_atime;
 275         time_t          i_mtime;
 276         time_t          i_ctime;
 277         unsigned long   i_blksize;
 278         unsigned long   i_blocks;
 279         unsigned long   i_version;
 280         unsigned long   i_nrpages;
 281         struct semaphore i_sem;
 282         struct inode_operations *i_op;
 283         struct super_block *i_sb;
 284         struct wait_queue *i_wait;
 285         struct file_lock *i_flock;
 286         struct vm_area_struct *i_mmap;
 287         struct page *i_pages;
 288         struct dquot *i_dquot[MAXQUOTAS];
 289         struct inode *i_next, *i_prev;
 290         struct inode *i_hash_next, *i_hash_prev;
 291         struct inode *i_bound_to, *i_bound_by;
 292         struct inode *i_mount;
 293         unsigned short i_count;
 294         unsigned short i_flags;
 295         unsigned char i_lock;
 296         unsigned char i_dirt;
 297         unsigned char i_pipe;
 298         unsigned char i_sock;
 299         unsigned char i_seek;
 300         unsigned char i_update;
 301         unsigned short i_writecount;
 302         union {
 303                 struct pipe_inode_info pipe_i;
 304                 struct minix_inode_info minix_i;
 305                 struct ext_inode_info ext_i;
 306                 struct ext2_inode_info ext2_i;
 307                 struct hpfs_inode_info hpfs_i;
 308                 struct msdos_inode_info msdos_i;
 309                 struct umsdos_inode_info umsdos_i;
 310                 struct iso_inode_info isofs_i;
 311                 struct nfs_inode_info nfs_i;
 312                 struct xiafs_inode_info xiafs_i;
 313                 struct sysv_inode_info sysv_i;
 314                 struct socket socket_i;
 315                 void * generic_ip;
 316         } u;
 317 };
 318 
 319 struct file {
 320         mode_t f_mode;
 321         loff_t f_pos;
 322         unsigned short f_flags;
 323         unsigned short f_count;
 324         off_t f_reada;
 325         struct file *f_next, *f_prev;
 326         int f_owner;            /* pid or -pgrp where SIGIO should be sent */
 327         struct inode * f_inode;
 328         struct file_operations * f_op;
 329         unsigned long f_version;
 330         void *private_data;     /* needed for tty driver, and maybe others */
 331 };
 332 
 333 struct file_lock {
 334         struct file_lock *fl_next;      /* singly linked list for this inode  */
 335         struct file_lock *fl_nextlink;  /* doubly linked list of all locks */
 336         struct file_lock *fl_prevlink;  /* used to simplify lock removal */
 337         struct file_lock *fl_block;
 338         struct task_struct *fl_owner;
 339         struct wait_queue *fl_wait;
 340         struct file *fl_file;
 341         char fl_flags;
 342         char fl_type;
 343         off_t fl_start;
 344         off_t fl_end;
 345 };
 346 
 347 struct fasync_struct {
 348         int    magic;
 349         struct fasync_struct    *fa_next; /* singly linked list */
 350         struct file             *fa_file;
 351 };
 352 
 353 #define FASYNC_MAGIC 0x4601
 354 
 355 extern int fasync_helper(struct inode *, struct file *, int, struct fasync_struct **);
 356 
 357 #include <linux/minix_fs_sb.h>
 358 #include <linux/ext_fs_sb.h>
 359 #include <linux/ext2_fs_sb.h>
 360 #include <linux/hpfs_fs_sb.h>
 361 #include <linux/msdos_fs_sb.h>
 362 #include <linux/iso_fs_sb.h>
 363 #include <linux/nfs_fs_sb.h>
 364 #include <linux/xia_fs_sb.h>
 365 #include <linux/sysv_fs_sb.h>
 366 
 367 struct super_block {
 368         kdev_t s_dev;
 369         unsigned long s_blocksize;
 370         unsigned char s_blocksize_bits;
 371         unsigned char s_lock;
 372         unsigned char s_rd_only;
 373         unsigned char s_dirt;
 374         struct file_system_type *s_type;
 375         struct super_operations *s_op;
 376         struct dquot_operations *dq_op;
 377         unsigned long s_flags;
 378         unsigned long s_magic;
 379         unsigned long s_time;
 380         struct inode * s_covered;
 381         struct inode * s_mounted;
 382         struct wait_queue * s_wait;
 383         union {
 384                 struct minix_sb_info minix_sb;
 385                 struct ext_sb_info ext_sb;
 386                 struct ext2_sb_info ext2_sb;
 387                 struct hpfs_sb_info hpfs_sb;
 388                 struct msdos_sb_info msdos_sb;
 389                 struct isofs_sb_info isofs_sb;
 390                 struct nfs_sb_info nfs_sb;
 391                 struct xiafs_sb_info xiafs_sb;
 392                 struct sysv_sb_info sysv_sb;
 393                 void *generic_sbp;
 394         } u;
 395 };
 396 
 397 /*
 398  * This is the "filldir" function type, used by readdir() to let
 399  * the kernel specify what kind of dirent layout it wants to have.
 400  * This allows the kernel to read directories into kernel space or
 401  * to have different dirent layouts depending on the binary type.
 402  */
 403 typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t);
 404         
 405 struct file_operations {
 406         int (*lseek) (struct inode *, struct file *, off_t, int);
 407         int (*read) (struct inode *, struct file *, char *, int);
 408         int (*write) (struct inode *, struct file *, const char *, int);
 409         int (*readdir) (struct inode *, struct file *, void *, filldir_t);
 410         int (*select) (struct inode *, struct file *, int, select_table *);
 411         int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
 412         int (*mmap) (struct inode *, struct file *, struct vm_area_struct *);
 413         int (*open) (struct inode *, struct file *);
 414         void (*release) (struct inode *, struct file *);
 415         int (*fsync) (struct inode *, struct file *);
 416         int (*fasync) (struct inode *, struct file *, int);
 417         int (*check_media_change) (kdev_t dev);
 418         int (*revalidate) (kdev_t dev);
 419 };
 420 
 421 struct inode_operations {
 422         struct file_operations * default_file_ops;
 423         int (*create) (struct inode *,const char *,int,int,struct inode **);
 424         int (*lookup) (struct inode *,const char *,int,struct inode **);
 425         int (*link) (struct inode *,struct inode *,const char *,int);
 426         int (*unlink) (struct inode *,const char *,int);
 427         int (*symlink) (struct inode *,const char *,int,const char *);
 428         int (*mkdir) (struct inode *,const char *,int,int);
 429         int (*rmdir) (struct inode *,const char *,int);
 430         int (*mknod) (struct inode *,const char *,int,int,int);
 431         int (*rename) (struct inode *,const char *,int,struct inode *,const char *,int);
 432         int (*readlink) (struct inode *,char *,int);
 433         int (*follow_link) (struct inode *,struct inode *,int,int,struct inode **);
 434         int (*readpage) (struct inode *, struct page *);
 435         int (*writepage) (struct inode *, struct page *);
 436         int (*bmap) (struct inode *,int);
 437         void (*truncate) (struct inode *);
 438         int (*permission) (struct inode *, int);
 439         int (*smap) (struct inode *,int);
 440 };
 441 
 442 struct super_operations {
 443         void (*read_inode) (struct inode *);
 444         int (*notify_change) (struct inode *, struct iattr *);
 445         void (*write_inode) (struct inode *);
 446         void (*put_inode) (struct inode *);
 447         void (*put_super) (struct super_block *);
 448         void (*write_super) (struct super_block *);
 449         void (*statfs) (struct super_block *, struct statfs *, int);
 450         int (*remount_fs) (struct super_block *, int *, char *);
 451 };
 452 
 453 struct dquot_operations {
 454         void (*initialize) (struct inode *, short);
 455         void (*drop) (struct inode *);
 456         int (*alloc_block) (const struct inode *, unsigned long);
 457         int (*alloc_inode) (const struct inode *, unsigned long);
 458         void (*free_block) (const struct inode *, unsigned long);
 459         void (*free_inode) (const struct inode *, unsigned long);
 460         int (*transfer) (struct inode *, struct iattr *, char);
 461 };
 462 
 463 struct file_system_type {
 464         struct super_block *(*read_super) (struct super_block *, void *, int);
 465         const char *name;
 466         int requires_dev;
 467         struct file_system_type * next;
 468 };
 469 
 470 extern int register_filesystem(struct file_system_type *);
 471 extern int unregister_filesystem(struct file_system_type *);
 472 
 473 asmlinkage int sys_open(const char *, int, int);
 474 asmlinkage int sys_close(unsigned int);         /* yes, it's really unsigned */
 475 
 476 extern void kill_fasync(struct fasync_struct *fa, int sig);
 477 
 478 extern int getname(const char * filename, char **result);
 479 extern void putname(char * name);
 480 extern int do_truncate(struct inode *, unsigned long);
 481 extern int register_blkdev(unsigned int, const char *, struct file_operations *);
 482 extern int unregister_blkdev(unsigned int major, const char * name);
 483 extern int blkdev_open(struct inode * inode, struct file * filp);
 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)
     /*  */
 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)
     /*  */
 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)
     /*  */
 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)
     /*  */
 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)
     /*  */
 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
/* */
root/include/linux/fs.h

INCLUDED FROM

DEFINITIONS
