include/linux/fs.h

   1 #ifndef _LINUX_FS_H
   2 #define _LINUX_FS_H
   3
   4 /*
   5  * This file has definitions for some important file table
   6  * structures etc.
   7  */
   8
   9 #include <linux/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 #include <linux/list.h>
  19 #include <linux/dcache.h>
  20 #include <linux/stat.h>
  21
  22 #include <asm/atomic.h>
  23 #include <asm/bitops.h>
  24 #include <asm/cache.h>
  25
  26 struct poll_table_struct;
  27
  28
  29 /*
  30  * It's silly to have NR_OPEN bigger than NR_FILE, but I'll fix
  31  * that later. Anyway, now the file code is no longer dependent
  32  * on bitmaps in unsigned longs, but uses the new fd_set structure..
  33  *
  34  * Some programs (notably those using select()) may have to be
  35  * recompiled to take full advantage of the new limits..
  36  */
  37
  38 /* Fixed constants first: */
  39 #undef NR_OPEN
  40 #define NR_OPEN 1024
  41
  42 #define BLOCK_SIZE_BITS 10
  43 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
  44
  45 /* And dynamically-tunable limits and defaults: */
  46 extern int max_inodes;
  47 extern int max_files, nr_files, nr_free_files;
  48 extern int max_super_blocks, nr_super_blocks;
  49
  50 #define NR_FILE  4096   /* this can well be larger on a larger system */
  51 #define NR_RESERVED_FILES 10 /* reserved for root */
  52 #define NR_SUPER 256
  53
  54 #define MAY_EXEC 1
  55 #define MAY_WRITE 2
  56 #define MAY_READ 4
  57
  58 #define FMODE_READ 1
  59 #define FMODE_WRITE 2
  60
  61 #define READ 0
  62 #define WRITE 1
  63 #define READA 2         /* read-ahead  - don't block if no resources */
  64 #define WRITEA 3        /* write-ahead - don't block if no resources */
  65
  66 #ifndef NULL
  67 #define NULL ((void *) 0)
  68 #endif
  69
  70 #define NIL_FILP        ((struct file *)0)
  71 #define SEL_IN          1
  72 #define SEL_OUT         2
  73 #define SEL_EX          4
  74
  75 /* public flags for file_system_type */
  76 #define FS_REQUIRES_DEV 1
  77 #define FS_NO_DCACHE    2 /* Only dcache the necessary things. */
  78 #define FS_NO_PRELIM    4 /* prevent preloading of dentries, even if
  79                            * FS_NO_DCACHE is not set.
  80                            */
  81 #define FS_IBASKET      8 /* FS does callback to free_ibasket() if space gets low. */
  82
  83 /*
  84  * These are the fs-independent mount-flags: up to 16 flags are supported
  85  */
  86 #define MS_RDONLY        1      /* Mount read-only */
  87 #define MS_NOSUID        2      /* Ignore suid and sgid bits */
  88 #define MS_NODEV         4      /* Disallow access to device special files */
  89 #define MS_NOEXEC        8      /* Disallow program execution */
  90 #define MS_SYNCHRONOUS  16      /* Writes are synced at once */
  91 #define MS_REMOUNT      32      /* Alter flags of a mounted FS */
  92 #define MS_MANDLOCK     64      /* Allow mandatory locks on an FS */
  93 #define S_QUOTA         128     /* Quota initialized for file/directory/symlink */
  94 #define S_APPEND        256     /* Append-only file */
  95 #define S_IMMUTABLE     512     /* Immutable file */
  96 #define MS_NOATIME      1024    /* Do not update access times. */
  97 #define MS_NODIRATIME   2048    /* Do not update directory access times */
  98
  99 /*
 100  * Flags that can be altered by MS_REMOUNT
 101  */
 102 #define MS_RMT_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME)
 103
 104 /*
 105  * Magic mount flag number. Has to be or-ed to the flag values.
 106  */
 107 #define MS_MGC_VAL 0xC0ED0000   /* magic flag number to indicate "new" flags */
 108 #define MS_MGC_MSK 0xffff0000   /* magic flag number mask */
 109
 110 /*
 111  * Note that read-only etc flags are inode-specific: setting some file-system
 112  * flags just means all the inodes inherit those flags by default. It might be
 113  * possible to override it selectively if you really wanted to with some
 114  * ioctl() that is not currently implemented.
 115  *
 116  * Exception: MS_RDONLY is always applied to the entire file system.
 117  */
 118 #define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY))
 119 #define IS_NOSUID(inode) ((inode)->i_flags & MS_NOSUID)
 120 #define IS_NODEV(inode) ((inode)->i_flags & MS_NODEV)
 121 #define IS_NOEXEC(inode) ((inode)->i_flags & MS_NOEXEC)
 122 #define IS_SYNC(inode) ((inode)->i_flags & MS_SYNCHRONOUS)
 123 #define IS_MANDLOCK(inode) ((inode)->i_flags & MS_MANDLOCK)
 124
 125 #define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA)
 126 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
 127 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
 128 #define IS_NOATIME(inode) ((inode)->i_flags & MS_NOATIME)
 129 #define IS_NODIRATIME(inode) ((inode)->i_flags & MS_NODIRATIME)
 130
 131 /* the read-only stuff doesn't really belong here, but any other place is
 132    probably as bad and I don't want to create yet another include file. */
 133
 134 #define BLKROSET   _IO(0x12,93) /* set device read-only (0 = read-write) */
 135 #define BLKROGET   _IO(0x12,94) /* get read-only status (0 = read_write) */
 136 #define BLKRRPART  _IO(0x12,95) /* re-read partition table */
 137 #define BLKGETSIZE _IO(0x12,96) /* return device size */
 138 #define BLKFLSBUF  _IO(0x12,97) /* flush buffer cache */
 139 #define BLKRASET   _IO(0x12,98) /* Set read ahead for block device */
 140 #define BLKRAGET   _IO(0x12,99) /* get current read ahead setting */
 141 #define BLKFRASET  _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
 142 #define BLKFRAGET  _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
 143 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
 144 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
 145
 146 #define BMAP_IOCTL 1            /* obsolete - kept for compatibility */
 147 #define FIBMAP     _IO(0x00,1)  /* bmap access */
 148 #define FIGETBSZ   _IO(0x00,2)  /* get the block size used for bmap */
 149
 150 #ifdef __KERNEL__
 151
 152 #include <asm/semaphore.h>
 153 #include <asm/byteorder.h>
 154 #include <asm/bitops.h>
 155
 156 extern void update_atime (struct inode *inode);
 157 #define UPDATE_ATIME(inode) update_atime (inode)
 158
 159 extern void buffer_init(void);
 160 extern void inode_init(void);
 161 extern void file_table_init(void);
 162 extern void dcache_init(void);
 163
 164 typedef char buffer_block[BLOCK_SIZE];
 165
 166 /* bh state bits */
 167 #define BH_Uptodate     0       /* 1 if the buffer contains valid data */
 168 #define BH_Dirty        1       /* 1 if the buffer is dirty */
 169 #define BH_Lock         2       /* 1 if the buffer is locked */
 170 #define BH_Req          3       /* 0 if the buffer has been invalidated */
 171 #define BH_Touched      4       /* 1 if the buffer has been touched (aging) */
 172 #define BH_Has_aged     5       /* 1 if the buffer has been aged (aging) */
 173 #define BH_Protected    6       /* 1 if the buffer is protected */
 174
 175 /*
 176  * Try to keep the most commonly used fields in single cache lines (16
 177  * bytes) to improve performance.  This ordering should be
 178  * particularly beneficial on 32-bit processors.
 179  *
 180  * We use the first 16 bytes for the data which is used in searches
 181  * over the block hash lists (ie. getblk(), find_buffer() and
 182  * friends).
 183  *
 184  * The second 16 bytes we use for lru buffer scans, as used by
 185  * sync_buffers() and refill_freelist().  -- sct
 186  */
 187 struct buffer_head {
 188         /* First cache line: */
 189         struct buffer_head * b_next;    /* Hash queue list */
 190         unsigned long b_blocknr;        /* block number */
 191         unsigned long b_size;           /* block size */
 192         kdev_t b_dev;                   /* device (B_FREE = free) */
 193         kdev_t b_rdev;                  /* Real device */
 194         unsigned long b_rsector;        /* Real buffer location on disk */
 195         struct buffer_head * b_this_page;       /* circular list of buffers in one page */
 196         unsigned long b_state;          /* buffer state bitmap (see above) */
 197         struct buffer_head * b_next_free;
 198         unsigned int b_count;           /* users using this block */
 199
 200         /* Non-performance-critical data follows. */
 201         char * b_data;                  /* pointer to data block (1024 bytes) */
 202         unsigned int b_list;            /* List that this buffer appears */
 203         unsigned long b_flushtime;      /* Time when this (dirty) buffer
 204                                          * should be written */
 205         unsigned long b_lru_time;       /* Time when this buffer was
 206                                          * last used. */
 207         struct wait_queue * b_wait;
 208         struct buffer_head ** b_pprev;          /* doubly linked list of hash-queue */
 209         struct buffer_head * b_prev_free;       /* doubly linked list of buffers */
 210         struct buffer_head * b_reqnext;         /* request queue */
 211
 212         /*
 213          * I/O completion
 214          */
 215         void (*b_end_io)(struct buffer_head *bh, int uptodate);
 216         void *b_dev_id;
 217 };
 218
 219 typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate);
 220 void init_buffer(struct buffer_head *bh, kdev_t dev, int block,
 221                  bh_end_io_t *handler, void *dev_id);
 222
 223 static inline int buffer_uptodate(struct buffer_head * bh)
 224 {
 225         return test_bit(BH_Uptodate, &bh->b_state);
 226 }
 227
 228 static inline int buffer_dirty(struct buffer_head * bh)
 229 {
 230         return test_bit(BH_Dirty, &bh->b_state);
 231 }
 232
 233 static inline int buffer_locked(struct buffer_head * bh)
 234 {
 235         return test_bit(BH_Lock, &bh->b_state);
 236 }
 237
 238 static inline int buffer_req(struct buffer_head * bh)
 239 {
 240         return test_bit(BH_Req, &bh->b_state);
 241 }
 242
 243 static inline int buffer_touched(struct buffer_head * bh)
 244 {
 245         return test_bit(BH_Touched, &bh->b_state);
 246 }
 247
 248 static inline int buffer_has_aged(struct buffer_head * bh)
 249 {
 250         return test_bit(BH_Has_aged, &bh->b_state);
 251 }
 252
 253 static inline int buffer_protected(struct buffer_head * bh)
 254 {
 255         return test_bit(BH_Protected, &bh->b_state);
 256 }
 257
 258 #include <linux/pipe_fs_i.h>
 259 #include <linux/minix_fs_i.h>
 260 #include <linux/ext2_fs_i.h>
 261 #include <linux/hpfs_fs_i.h>
 262 #include <linux/ntfs_fs_i.h>
 263 #include <linux/msdos_fs_i.h>
 264 #include <linux/umsdos_fs_i.h>
 265 #include <linux/iso_fs_i.h>
 266 #include <linux/nfs_fs_i.h>
 267 #include <linux/sysv_fs_i.h>
 268 #include <linux/affs_fs_i.h>
 269 #include <linux/ufs_fs_i.h>
 270 #include <linux/coda_fs_i.h>
 271 #include <linux/romfs_fs_i.h>
 272 #include <linux/smb_fs_i.h>
 273 #include <linux/hfs_fs_i.h>
 274 #include <linux/adfs_fs_i.h>
 275
 276 /*
 277  * Attribute flags.  These should be or-ed together to figure out what
 278  * has been changed!
 279  */
 280 #define ATTR_MODE       1
 281 #define ATTR_UID        2
 282 #define ATTR_GID        4
 283 #define ATTR_SIZE       8
 284 #define ATTR_ATIME      16
 285 #define ATTR_MTIME      32
 286 #define ATTR_CTIME      64
 287 #define ATTR_ATIME_SET  128
 288 #define ATTR_MTIME_SET  256
 289 #define ATTR_FORCE      512     /* Not a change, but a change it */
 290 #define ATTR_ATTR_FLAG  1024
 291
 292 /*
 293  * This is the Inode Attributes structure, used for notify_change().  It
 294  * uses the above definitions as flags, to know which values have changed.
 295  * Also, in this manner, a Filesystem can look at only the values it cares
 296  * about.  Basically, these are the attributes that the VFS layer can
 297  * request to change from the FS layer.
 298  *
 299  * Derek Atkins <warlord@MIT.EDU> 94-10-20
 300  */
 301 struct iattr {
 302         unsigned int    ia_valid;
 303         umode_t         ia_mode;
 304         uid_t           ia_uid;
 305         gid_t           ia_gid;
 306         off_t           ia_size;
 307         time_t          ia_atime;
 308         time_t          ia_mtime;
 309         time_t          ia_ctime;
 310         unsigned int    ia_attr_flags;
 311 };
 312
 313 /*
 314  * This is the inode attributes flag definitions
 315  */
 316 #define ATTR_FLAG_SYNCRONOUS    1       /* Syncronous write */
 317 #define ATTR_FLAG_NOATIME       2       /* Don't update atime */
 318 #define ATTR_FLAG_APPEND        4       /* Append-only file */
 319 #define ATTR_FLAG_IMMUTABLE     8       /* Immutable file */
 320 #define ATTR_FLAG_NODIRATIME    16      /* Don't update atime for directory */
 321
 322 /*
 323  * Includes for diskquotas and mount structures.
 324  */
 325 #include <linux/quota.h>
 326 #include <linux/mount.h>
 327
 328 struct inode {
 329         struct list_head        i_hash;
 330         struct list_head        i_list;
 331         struct list_head        i_dentry;
 332
 333         unsigned long           i_ino;
 334         unsigned int            i_count;
 335         kdev_t                  i_dev;
 336         umode_t                 i_mode;
 337         nlink_t                 i_nlink;
 338         uid_t                   i_uid;
 339         gid_t                   i_gid;
 340         kdev_t                  i_rdev;
 341         off_t                   i_size;
 342         time_t                  i_atime;
 343         time_t                  i_mtime;
 344         time_t                  i_ctime;
 345         unsigned long           i_blksize;
 346         unsigned long           i_blocks;
 347         unsigned long           i_version;
 348         unsigned long           i_nrpages;
 349         struct semaphore        i_sem;
 350         struct inode_operations *i_op;
 351         struct super_block      *i_sb;
 352         struct wait_queue       *i_wait;
 353         struct file_lock        *i_flock;
 354         struct vm_area_struct   *i_mmap;
 355         struct page             *i_pages;
 356         struct dquot            *i_dquot[MAXQUOTAS];
 357
 358         unsigned long           i_state;
 359
 360         unsigned int            i_flags;
 361         unsigned char           i_pipe;
 362         unsigned char           i_sock;
 363
 364         int                     i_writecount;
 365         unsigned int            i_attr_flags;
 366         union {
 367                 struct pipe_inode_info          pipe_i;
 368                 struct minix_inode_info         minix_i;
 369                 struct ext2_inode_info          ext2_i;
 370                 struct hpfs_inode_info          hpfs_i;
 371                 struct ntfs_inode_info          ntfs_i;
 372                 struct msdos_inode_info         msdos_i;
 373                 struct umsdos_inode_info        umsdos_i;
 374                 struct iso_inode_info           isofs_i;
 375                 struct nfs_inode_info           nfs_i;
 376                 struct sysv_inode_info          sysv_i;
 377                 struct affs_inode_info          affs_i;
 378                 struct ufs_inode_info           ufs_i;
 379                 struct romfs_inode_info         romfs_i;
 380                 struct coda_inode_info          coda_i;
 381                 struct smb_inode_info           smbfs_i;
 382                 struct hfs_inode_info           hfs_i;
 383                 struct adfs_inode_info          adfs_i;
 384                 struct socket                   socket_i;
 385                 void                            *generic_ip;
 386         } u;
 387 };
 388
 389 /* Inode state bits.. */
 390 #define I_DIRTY         1
 391 #define I_LOCK          2
 392 #define I_FREEING       4
 393
 394 extern void __mark_inode_dirty(struct inode *);
 395 static inline void mark_inode_dirty(struct inode *inode)
 396 {
 397         if (!(inode->i_state & I_DIRTY))
 398                 __mark_inode_dirty(inode);
 399 }
 400
 401 struct fown_struct {
 402         int pid;                /* pid or -pgrp where SIGIO should be sent */
 403         uid_t uid, euid;        /* uid/euid of process setting the owner */
 404         int signum;             /* posix.1b rt signal to be delivered on IO */
 405 };
 406
 407 struct file {
 408         struct file             *f_next, **f_pprev;
 409         struct dentry           *f_dentry;
 410         struct file_operations  *f_op;
 411         mode_t                  f_mode;
 412         loff_t                  f_pos;
 413         unsigned short          f_count, f_flags;
 414         unsigned long           f_reada, f_ramax, f_raend, f_ralen, f_rawin;
 415         struct fown_struct      f_owner;
 416
 417         unsigned long           f_version;
 418
 419         /* needed for tty driver, and maybe others */
 420         void                    *private_data;
 421 };
 422
 423 extern int init_private_file(struct file *, struct dentry *, int);
 424
 425 #define FL_POSIX        1
 426 #define FL_FLOCK        2
 427 #define FL_BROKEN       4       /* broken flock() emulation */
 428 #define FL_ACCESS       8       /* for processes suspended by mandatory locking */
 429 #define FL_LOCKD        16      /* lock held by rpc.lockd */
 430
 431 /*
 432  * The POSIX file lock owner is determined by
 433  * the "struct files_struct" in the thread group
 434  * (or NULL for no owner - BSD locks).
 435  *
 436  * Lockd stuffs a "host" pointer into this.
 437  */
 438 typedef struct files_struct *fl_owner_t;
 439
 440 struct file_lock {
 441         struct file_lock *fl_next;      /* singly linked list for this inode  */
 442         struct file_lock *fl_nextlink;  /* doubly linked list of all locks */
 443         struct file_lock *fl_prevlink;  /* used to simplify lock removal */
 444         struct file_lock *fl_nextblock; /* circular list of blocked processes */
 445         struct file_lock *fl_prevblock;
 446         fl_owner_t fl_owner;
 447         unsigned int fl_pid;
 448         struct wait_queue *fl_wait;
 449         struct file *fl_file;
 450         unsigned char fl_flags;
 451         unsigned char fl_type;
 452         off_t fl_start;
 453         off_t fl_end;
 454
 455         void (*fl_notify)(struct file_lock *);  /* unblock callback */
 456
 457         union {
 458                 struct nfs_lock_info    nfs_fl;
 459         } fl_u;
 460 };
 461
 462 extern struct file_lock         *file_lock_table;
 463
 464 #include <linux/fcntl.h>
 465
 466 extern int fcntl_getlk(unsigned int fd, struct flock *l);
 467 extern int fcntl_setlk(unsigned int fd, unsigned int cmd, struct flock *l);
 468
 469 /* fs/locks.c */
 470 extern void locks_remove_posix(struct file *, fl_owner_t id);
 471 extern void locks_remove_flock(struct file *);
 472 extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
 473 extern int posix_lock_file(struct file *, struct file_lock *, unsigned int);
 474 extern void posix_block_lock(struct file_lock *, struct file_lock *);
 475 extern void posix_unblock_lock(struct file_lock *);
 476
 477 #include <linux/stat.h>
 478
 479 #define FLOCK_VERIFY_READ  1
 480 #define FLOCK_VERIFY_WRITE 2
 481
 482 extern int locks_mandatory_locked(struct inode *inode);
 483 extern int locks_mandatory_area(int read_write, struct inode *inode,
 484                                 struct file *filp, loff_t offset,
 485                                 size_t count);
 486
 487 extern inline int locks_verify_locked(struct inode *inode)
 488 {
 489         /* Candidates for mandatory locking have the setgid bit set
 490          * but no group execute bit -  an otherwise meaningless combination.
 491          */
 492         if (IS_MANDLOCK(inode) &&
 493             (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
 494                 return (locks_mandatory_locked(inode));
 495         return (0);
 496 }
 497
 498 extern inline int locks_verify_area(int read_write, struct inode *inode,
 499                                     struct file *filp, loff_t offset,
 500                                     size_t count)
 501 {
 502         /* Candidates for mandatory locking have the setgid bit set
 503          * but no group execute bit -  an otherwise meaningless combination.
 504          */
 505         if (IS_MANDLOCK(inode) &&
 506             (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
 507                 return (locks_mandatory_area(read_write, inode, filp, offset,
 508                                              count));
 509         return (0);
 510 }
 511
 512 struct fasync_struct {
 513         int    magic;
 514         int    fa_fd;
 515         struct fasync_struct    *fa_next; /* singly linked list */
 516         struct file             *fa_file;
 517 };
 518
 519 #define FASYNC_MAGIC 0x4601
 520
 521 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
 522
 523 #include <linux/minix_fs_sb.h>
 524 #include <linux/ext2_fs_sb.h>
 525 #include <linux/hpfs_fs_sb.h>
 526 #include <linux/ntfs_fs_sb.h>
 527 #include <linux/msdos_fs_sb.h>
 528 #include <linux/iso_fs_sb.h>
 529 #include <linux/nfs_fs_sb.h>
 530 #include <linux/sysv_fs_sb.h>
 531 #include <linux/affs_fs_sb.h>
 532 #include <linux/ufs_fs_sb.h>
 533 #include <linux/romfs_fs_sb.h>
 534 #include <linux/smb_fs_sb.h>
 535 #include <linux/hfs_fs_sb.h>
 536 #include <linux/adfs_fs_sb.h>
 537
 538 extern struct list_head super_blocks;
 539
 540 #define sb_entry(list)  list_entry((list), struct super_block, s_list)
 541 struct super_block {
 542         struct list_head        s_list;         /* Keep this first */
 543         kdev_t                  s_dev;
 544         unsigned long           s_blocksize;
 545         unsigned char           s_blocksize_bits;
 546         unsigned char           s_lock;
 547         unsigned char           s_rd_only;
 548         unsigned char           s_dirt;
 549         struct file_system_type *s_type;
 550         struct super_operations *s_op;
 551         struct dquot_operations *dq_op;
 552         unsigned long           s_flags;
 553         unsigned long           s_magic;
 554         unsigned long           s_time;
 555         struct dentry           *s_root;
 556         struct wait_queue       *s_wait;
 557
 558         struct inode            *s_ibasket;
 559         short int               s_ibasket_count;
 560         short int               s_ibasket_max;
 561         struct list_head        s_dirty;        /* dirty inodes */
 562
 563         union {
 564                 struct minix_sb_info    minix_sb;
 565                 struct ext2_sb_info     ext2_sb;
 566                 struct hpfs_sb_info     hpfs_sb;
 567                 struct ntfs_sb_info     ntfs_sb;
 568                 struct msdos_sb_info    msdos_sb;
 569                 struct isofs_sb_info    isofs_sb;
 570                 struct nfs_sb_info      nfs_sb;
 571                 struct sysv_sb_info     sysv_sb;
 572                 struct affs_sb_info     affs_sb;
 573                 struct ufs_sb_info      ufs_sb;
 574                 struct romfs_sb_info    romfs_sb;
 575                 struct smb_sb_info      smbfs_sb;
 576                 struct hfs_sb_info      hfs_sb;
 577                 struct adfs_sb_info     adfs_sb;
 578                 void                    *generic_sbp;
 579         } u;
 580 };
 581
 582 /*
 583  * This is the "filldir" function type, used by readdir() to let
 584  * the kernel specify what kind of dirent layout it wants to have.
 585  * This allows the kernel to read directories into kernel space or
 586  * to have different dirent layouts depending on the binary type.
 587  */
 588 typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t);
 589
 590 struct file_operations {
 591         loff_t (*llseek) (struct file *, loff_t, int);
 592         ssize_t (*read) (struct file *, char *, size_t, loff_t *);
 593         ssize_t (*write) (struct file *, const char *, size_t, loff_t *);
 594         int (*readdir) (struct file *, void *, filldir_t);
 595         unsigned int (*poll) (struct file *, struct poll_table_struct *);
 596         int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
 597         int (*mmap) (struct file *, struct vm_area_struct *);
 598         int (*open) (struct inode *, struct file *);
 599         int (*flush) (struct file *);
 600         int (*release) (struct inode *, struct file *);
 601         int (*fsync) (struct file *, struct dentry *);
 602         int (*fasync) (int, struct file *, int);
 603         int (*check_media_change) (kdev_t dev);
 604         int (*revalidate) (kdev_t dev);
 605         int (*lock) (struct file *, int, struct file_lock *);
 606 };
 607
 608 struct inode_operations {
 609         struct file_operations * default_file_ops;
 610         int (*create) (struct inode *,struct dentry *,int);
 611         int (*lookup) (struct inode *,struct dentry *);
 612         int (*link) (struct dentry *,struct inode *,struct dentry *);
 613         int (*unlink) (struct inode *,struct dentry *);
 614         int (*symlink) (struct inode *,struct dentry *,const char *);
 615         int (*mkdir) (struct inode *,struct dentry *,int);
 616         int (*rmdir) (struct inode *,struct dentry *);
 617         int (*mknod) (struct inode *,struct dentry *,int,int);
 618         int (*rename) (struct inode *, struct dentry *,
 619                         struct inode *, struct dentry *);
 620         int (*readlink) (struct dentry *, char *,int);
 621         struct dentry * (*follow_link) (struct dentry *, struct dentry *);
 622         int (*readpage) (struct file *, struct page *);
 623         int (*writepage) (struct file *, struct page *);
 624         int (*bmap) (struct inode *,int);
 625         void (*truncate) (struct inode *);
 626         int (*permission) (struct inode *, int);
 627         int (*smap) (struct inode *,int);
 628         int (*updatepage) (struct file *, struct page *, const char *,
 629                                 unsigned long, unsigned int, int);
 630         int (*revalidate) (struct dentry *);
 631 };
 632
 633 struct super_operations {
 634         void (*read_inode) (struct inode *);
 635         void (*write_inode) (struct inode *);
 636         void (*put_inode) (struct inode *);
 637         void (*delete_inode) (struct inode *);
 638         int (*notify_change) (struct dentry *, struct iattr *);
 639         void (*put_super) (struct super_block *);
 640         void (*write_super) (struct super_block *);
 641         int (*statfs) (struct super_block *, struct statfs *, int);
 642         int (*remount_fs) (struct super_block *, int *, char *);
 643         void (*clear_inode) (struct inode *);
 644         void (*umount_begin) (struct super_block *);
 645 };
 646
 647 struct dquot_operations {
 648         void (*initialize) (struct inode *, short);
 649         void (*drop) (struct inode *);
 650         int (*alloc_block) (const struct inode *, unsigned long, uid_t, char);
 651         int (*alloc_inode) (const struct inode *, unsigned long, uid_t);
 652         void (*free_block) (const struct inode *, unsigned long);
 653         void (*free_inode) (const struct inode *, unsigned long);
 654         int (*transfer) (struct inode *, struct iattr *, char, uid_t);
 655 };
 656
 657 struct file_system_type {
 658         const char *name;
 659         int fs_flags;
 660         struct super_block *(*read_super) (struct super_block *, void *, int);
 661         struct file_system_type * next;
 662 };
 663
 664 extern int register_filesystem(struct file_system_type *);
 665 extern int unregister_filesystem(struct file_system_type *);
 666
 667 /* fs/open.c */
 668
 669 asmlinkage int sys_open(const char *, int, int);
 670 asmlinkage int sys_close(unsigned int);         /* yes, it's really unsigned */
 671 extern int do_truncate(struct dentry *, unsigned long);
 672 extern int get_unused_fd(void);
 673 extern void put_unused_fd(unsigned int);
 674 extern int close_fp(struct file *, fl_owner_t id);
 675
 676 extern char * getname(const char * filename);
 677 extern void putname(char * name);
 678
 679 extern void kill_fasync(struct fasync_struct *fa, int sig);
 680 extern int register_blkdev(unsigned int, const char *, struct file_operations *);
 681 extern int unregister_blkdev(unsigned int major, const char * name);
 682 extern int blkdev_open(struct inode * inode, struct file * filp);
 683 extern int blkdev_release (struct inode * inode);
 684 extern struct file_operations def_blk_fops;
 685 extern struct inode_operations blkdev_inode_operations;
 686
 687 extern int register_chrdev(unsigned int, const char *, struct file_operations *);
 688 extern int unregister_chrdev(unsigned int major, const char * name);
 689 extern int chrdev_open(struct inode * inode, struct file * filp);
 690 extern struct file_operations def_chr_fops;
 691 extern struct inode_operations chrdev_inode_operations;
 692
 693 extern void init_fifo(struct inode * inode);
 694 extern struct inode_operations fifo_inode_operations;
 695
 696 /* Invalid inode operations -- fs/bad_inode.c */
 697 extern void make_bad_inode(struct inode * inode);
 698 extern int is_bad_inode(struct inode * inode);
 699
 700 extern struct file_operations connecting_fifo_fops;
 701 extern struct file_operations read_fifo_fops;
 702 extern struct file_operations write_fifo_fops;
 703 extern struct file_operations rdwr_fifo_fops;
 704 extern struct file_operations read_pipe_fops;
 705 extern struct file_operations write_pipe_fops;
 706 extern struct file_operations rdwr_pipe_fops;
 707
 708 extern struct file_system_type *get_fs_type(const char *name);
 709
 710 extern int fs_may_remount_ro(struct super_block *);
 711 extern int fs_may_mount(kdev_t dev);
 712
 713 extern struct file *inuse_filps;
 714
 715 extern void refile_buffer(struct buffer_head * buf);
 716 extern void set_writetime(struct buffer_head * buf, int flag);
 717 extern int try_to_free_buffer(struct buffer_head*, struct buffer_head**, int);
 718
 719 extern int nr_buffers;
 720 extern int buffermem;
 721 extern int nr_buffer_heads;
 722
 723 #define BUF_CLEAN       0
 724 #define BUF_LOCKED      1       /* Buffers scheduled for write */
 725 #define BUF_DIRTY       2       /* Dirty buffers, not yet scheduled for write */
 726 #define NR_LIST         3
 727
 728 void mark_buffer_uptodate(struct buffer_head * bh, int on);
 729
 730 extern inline void mark_buffer_clean(struct buffer_head * bh)
 731 {
 732         if (test_and_clear_bit(BH_Dirty, &bh->b_state)) {
 733                 if (bh->b_list == BUF_DIRTY)
 734                         refile_buffer(bh);
 735         }
 736 }
 737
 738 extern inline void mark_buffer_dirty(struct buffer_head * bh, int flag)
 739 {
 740         if (!test_and_set_bit(BH_Dirty, &bh->b_state)) {
 741                 set_writetime(bh, flag);
 742                 if (bh->b_list != BUF_DIRTY)
 743                         refile_buffer(bh);
 744         }
 745 }
 746
 747 extern int check_disk_change(kdev_t dev);
 748 extern int invalidate_inodes(struct super_block * sb);
 749 extern void invalidate_inode_pages(struct inode *);
 750 extern void invalidate_buffers(kdev_t dev);
 751 extern int floppy_is_wp(int minor);
 752 extern void sync_inodes(kdev_t dev);
 753 extern void write_inode_now(struct inode *inode);
 754 extern void sync_dev(kdev_t dev);
 755 extern int fsync_dev(kdev_t dev);
 756 extern void sync_supers(kdev_t dev);
 757 extern int bmap(struct inode * inode,int block);
 758 extern int notify_change(struct dentry *, struct iattr *);
 759 extern int permission(struct inode * inode,int mask);
 760 extern int get_write_access(struct inode *inode);
 761 extern void put_write_access(struct inode *inode);
 762 extern struct dentry * open_namei(const char * pathname, int flag, int mode);
 763 extern struct dentry * do_mknod(const char * filename, int mode, dev_t dev);
 764 extern int do_pipe(int *);
 765
 766 /* fs/dcache.c -- generic fs support functions */
 767 extern int is_subdir(struct dentry *, struct dentry *);
 768 extern ino_t find_inode_number(struct dentry *, struct qstr *);
 769
 770 /*
 771  * Kernel pointers have redundant information, so we can use a
 772  * scheme where we can return either an error code or a dentry
 773  * pointer with the same return value.
 774  *
 775  * This should be a per-architecture thing, to allow different
 776  * error and pointer decisions.
 777  */
 778 #define ERR_PTR(err)    ((void *)((long)(err)))
 779 #define PTR_ERR(ptr)    ((long)(ptr))
 780 #define IS_ERR(ptr)     ((unsigned long)(ptr) > (unsigned long)(-1000))
 781
 782 extern struct dentry * lookup_dentry(const char *, struct dentry *, int);
 783 extern struct dentry * __namei(const char *, int);
 784
 785 #define namei(pathname)         __namei(pathname, 1)
 786 #define lnamei(pathname)        __namei(pathname, 0)
 787
 788 extern void iput(struct inode *);
 789 extern struct inode * iget(struct super_block *, unsigned long);
 790 extern void clear_inode(struct inode *);
 791 extern struct inode * get_empty_inode(void);
 792
 793 extern void insert_inode_hash(struct inode *);
 794 extern void remove_inode_hash(struct inode *);
 795 extern struct file * get_empty_filp(void);
 796 extern struct buffer_head * get_hash_table(kdev_t, int, int);
 797 extern struct buffer_head * getblk(kdev_t, int, int);
 798 extern struct buffer_head * find_buffer(kdev_t dev, int block, int size);
 799 extern void ll_rw_block(int, int, struct buffer_head * bh[]);
 800 extern void ll_rw_page(int, kdev_t, unsigned long, char *);
 801 extern void ll_rw_swap_file(int, kdev_t, unsigned int *, int, char *);
 802 extern int is_read_only(kdev_t);
 803 extern void __brelse(struct buffer_head *);
 804 extern inline void brelse(struct buffer_head *buf)
 805 {
 806         if (buf)
 807                 __brelse(buf);
 808 }
 809 extern void __bforget(struct buffer_head *buf);
 810 extern inline void bforget(struct buffer_head *buf)
 811 {
 812         if (buf)
 813                 __bforget(buf);
 814 }
 815 extern void set_blocksize(kdev_t dev, int size);
 816 extern unsigned int get_hardblocksize(kdev_t dev);
 817 extern struct buffer_head * bread(kdev_t dev, int block, int size);
 818 extern struct buffer_head * breada(kdev_t dev,int block, int size,
 819                                    unsigned int pos, unsigned int filesize);
 820
 821 extern int brw_page(int, struct page *, kdev_t, int [], int, int);
 822
 823 extern int generic_readpage(struct file *, struct page *);
 824 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
 825 extern ssize_t generic_file_read(struct file *, char *, size_t, loff_t *);
 826 extern ssize_t generic_file_write(struct file *, const char*, size_t, loff_t*);
 827
 828 extern struct super_block *get_super(kdev_t dev);
 829 extern void put_super(kdev_t dev);
 830 unsigned long generate_cluster(kdev_t dev, int b[], int size);
 831 unsigned long generate_cluster_swab32(kdev_t dev, int b[], int size);
 832 extern kdev_t ROOT_DEV;
 833
 834 extern void show_buffers(void);
 835 extern void mount_root(void);
 836
 837 #ifdef CONFIG_BLK_DEV_INITRD
 838 extern kdev_t real_root_dev;
 839 extern int change_root(kdev_t new_root_dev,const char *put_old);
 840 #endif
 841
 842 extern ssize_t char_read(struct file *, char *, size_t, loff_t *);
 843 extern ssize_t block_read(struct file *, char *, size_t, loff_t *);
 844 extern int read_ahead[];
 845
 846 extern ssize_t char_write(struct file *, const char *, size_t, loff_t *);
 847 extern ssize_t block_write(struct file *, const char *, size_t, loff_t *);
 848
 849 extern int block_fsync(struct file *, struct dentry *dir);
 850 extern int file_fsync(struct file *, struct dentry *dir);
 851
 852 extern int inode_change_ok(struct inode *, struct iattr *);
 853 extern void inode_setattr(struct inode *, struct iattr *);
 854
 855 /* kludge to get SCSI modules working */
 856 #include <linux/minix_fs.h>
 857 #include <linux/minix_fs_sb.h>
 858
 859 #endif /* __KERNEL__ */
 860
 861 #endif