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 #define MS_ODD_RENAME   32768   /* Temporary stuff; will go away as soon
 100                                   * as nfs_rename() will be cleaned up
 101                                   */
 102
 103 /*
 104  * Flags that can be altered by MS_REMOUNT
 105  */
 106 #define MS_RMT_MASK     (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|\
 107                         MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME)
 108
 109 /*
 110  * Magic mount flag number. Has to be or-ed to the flag values.
 111  */
 112 #define MS_MGC_VAL 0xC0ED0000   /* magic flag number to indicate "new" flags */
 113 #define MS_MGC_MSK 0xffff0000   /* magic flag number mask */
 114
 115 /*
 116  * Note that nosuid etc flags are inode-specific: setting some file-system
 117  * flags just means all the inodes inherit those flags by default. It might be
 118  * possible to override it selectively if you really wanted to with some
 119  * ioctl() that is not currently implemented.
 120  *
 121  * Exception: MS_RDONLY is always applied to the entire file system.
 122  *
 123  * Unfortunately, it is possible to change a filesystems flags with it mounted
 124  * with files in use.  This means that all of the inodes will not have their
 125  * i_flags updated.  Hence, i_flags no longer inherit the superblock mount
 126  * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
 127  */
 128 #define __IS_FLG(inode,flg) (((inode)->i_sb && (inode)->i_sb->s_flags & (flg)) \
 129                                 || (inode)->i_flags & (flg))
 130
 131 #define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY))
 132 #define IS_NOSUID(inode)        __IS_FLG(inode, MS_NOSUID)
 133 #define IS_NODEV(inode)         __IS_FLG(inode, MS_NODEV)
 134 #define IS_NOEXEC(inode)        __IS_FLG(inode, MS_NOEXEC)
 135 #define IS_SYNC(inode)          __IS_FLG(inode, MS_SYNCHRONOUS)
 136 #define IS_MANDLOCK(inode)      __IS_FLG(inode, MS_MANDLOCK)
 137
 138 #define IS_QUOTAINIT(inode)     ((inode)->i_flags & S_QUOTA)
 139 #define IS_APPEND(inode)        ((inode)->i_flags & S_APPEND)
 140 #define IS_IMMUTABLE(inode)     ((inode)->i_flags & S_IMMUTABLE)
 141 #define IS_NOATIME(inode)       __IS_FLG(inode, MS_NOATIME)
 142 #define IS_NODIRATIME(inode)    __IS_FLG(inode, MS_NODIRATIME)
 143
 144
 145 /* the read-only stuff doesn't really belong here, but any other place is
 146    probably as bad and I don't want to create yet another include file. */
 147
 148 #define BLKROSET   _IO(0x12,93) /* set device read-only (0 = read-write) */
 149 #define BLKROGET   _IO(0x12,94) /* get read-only status (0 = read_write) */
 150 #define BLKRRPART  _IO(0x12,95) /* re-read partition table */
 151 #define BLKGETSIZE _IO(0x12,96) /* return device size */
 152 #define BLKFLSBUF  _IO(0x12,97) /* flush buffer cache */
 153 #define BLKRASET   _IO(0x12,98) /* Set read ahead for block device */
 154 #define BLKRAGET   _IO(0x12,99) /* get current read ahead setting */
 155 #define BLKFRASET  _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
 156 #define BLKFRAGET  _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
 157 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
 158 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
 159 #define BLKSSZGET  _IO(0x12,104)/* get block device sector size */
 160 #if 0
 161 #define BLKPG      _IO(0x12,105)/* See blkpg.h */
 162 /* This was here just to show that the number is taken -
 163    probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
 164 #endif
 165
 166
 167 #define BMAP_IOCTL 1            /* obsolete - kept for compatibility */
 168 #define FIBMAP     _IO(0x00,1)  /* bmap access */
 169 #define FIGETBSZ   _IO(0x00,2)  /* get the block size used for bmap */
 170
 171 #ifdef __KERNEL__
 172
 173 #include <asm/semaphore.h>
 174 #include <asm/byteorder.h>
 175
 176 extern void update_atime (struct inode *);
 177 #define UPDATE_ATIME(inode) update_atime (inode)
 178
 179 extern void buffer_init(unsigned long);
 180 extern void inode_init(void);
 181 extern void file_table_init(void);
 182 extern void dcache_init(void);
 183
 184 typedef char buffer_block[BLOCK_SIZE];
 185
 186 /* bh state bits */
 187 #define BH_Uptodate     0       /* 1 if the buffer contains valid data */
 188 #define BH_Dirty        1       /* 1 if the buffer is dirty */
 189 #define BH_Lock         2       /* 1 if the buffer is locked */
 190 #define BH_Req          3       /* 0 if the buffer has been invalidated */
 191 #define BH_Protected    6       /* 1 if the buffer is protected */
 192 /*
 193  * Try to keep the most commonly used fields in single cache lines (16
 194  * bytes) to improve performance.  This ordering should be
 195  * particularly beneficial on 32-bit processors.
 196  *
 197  * We use the first 16 bytes for the data which is used in searches
 198  * over the block hash lists (ie. getblk(), find_buffer() and
 199  * friends).
 200  *
 201  * The second 16 bytes we use for lru buffer scans, as used by
 202  * sync_buffers() and refill_freelist().  -- sct
 203  */
 204 struct buffer_head {
 205         /* First cache line: */
 206         struct buffer_head * b_next;    /* Hash queue list */
 207         unsigned long b_blocknr;        /* block number */
 208         unsigned long b_size;           /* block size */
 209         kdev_t b_dev;                   /* device (B_FREE = free) */
 210         kdev_t b_rdev;                  /* Real device */
 211         unsigned long b_rsector;        /* Real buffer location on disk */
 212         struct buffer_head * b_this_page;       /* circular list of buffers in one page */
 213         unsigned long b_state;          /* buffer state bitmap (see above) */
 214         struct buffer_head * b_next_free;
 215         unsigned int b_count;           /* users using this block */
 216
 217         /* Non-performance-critical data follows. */
 218         char * b_data;                  /* pointer to data block (1024 bytes) */
 219         unsigned int b_list;            /* List that this buffer appears */
 220         unsigned long b_flushtime;      /* Time when this (dirty) buffer
 221                                          * should be written */
 222         wait_queue_head_t b_wait;
 223         struct buffer_head ** b_pprev;          /* doubly linked list of hash-queue */
 224         struct buffer_head * b_prev_free;       /* doubly linked list of buffers */
 225         struct buffer_head * b_reqnext;         /* request queue */
 226
 227         /*
 228          * I/O completion
 229          */
 230         void (*b_end_io)(struct buffer_head *bh, int uptodate);
 231         void *b_dev_id;
 232 };
 233
 234 typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate);
 235 void init_buffer(struct buffer_head *, kdev_t, int, bh_end_io_t *, void *);
 236
 237 static inline int buffer_uptodate(struct buffer_head * bh)
 238 {
 239         return test_bit(BH_Uptodate, &bh->b_state);
 240 }
 241
 242 static inline int buffer_dirty(struct buffer_head * bh)
 243 {
 244         return test_bit(BH_Dirty, &bh->b_state);
 245 }
 246
 247 static inline int buffer_locked(struct buffer_head * bh)
 248 {
 249         return test_bit(BH_Lock, &bh->b_state);
 250 }
 251
 252 static inline int buffer_req(struct buffer_head * bh)
 253 {
 254         return test_bit(BH_Req, &bh->b_state);
 255 }
 256
 257 static inline int buffer_protected(struct buffer_head * bh)
 258 {
 259         return test_bit(BH_Protected, &bh->b_state);
 260 }
 261
 262 #define buffer_page(bh)         (mem_map + MAP_NR((bh)->b_data))
 263 #define touch_buffer(bh)        set_bit(PG_referenced, &buffer_page(bh)->flags)
 264
 265 #include <linux/pipe_fs_i.h>
 266 #include <linux/minix_fs_i.h>
 267 #include <linux/ext2_fs_i.h>
 268 #include <linux/hpfs_fs_i.h>
 269 #include <linux/ntfs_fs_i.h>
 270 #include <linux/msdos_fs_i.h>
 271 #include <linux/umsdos_fs_i.h>
 272 #include <linux/iso_fs_i.h>
 273 #include <linux/nfs_fs_i.h>
 274 #include <linux/sysv_fs_i.h>
 275 #include <linux/affs_fs_i.h>
 276 #include <linux/ufs_fs_i.h>
 277 #include <linux/efs_fs_i.h>
 278 #include <linux/coda_fs_i.h>
 279 #include <linux/romfs_fs_i.h>
 280 #include <linux/smb_fs_i.h>
 281 #include <linux/hfs_fs_i.h>
 282 #include <linux/adfs_fs_i.h>
 283 #include <linux/qnx4_fs_i.h>
 284
 285 /*
 286  * Attribute flags.  These should be or-ed together to figure out what
 287  * has been changed!
 288  */
 289 #define ATTR_MODE       1
 290 #define ATTR_UID        2
 291 #define ATTR_GID        4
 292 #define ATTR_SIZE       8
 293 #define ATTR_ATIME      16
 294 #define ATTR_MTIME      32
 295 #define ATTR_CTIME      64
 296 #define ATTR_ATIME_SET  128
 297 #define ATTR_MTIME_SET  256
 298 #define ATTR_FORCE      512     /* Not a change, but a change it */
 299 #define ATTR_ATTR_FLAG  1024
 300
 301 /*
 302  * This is the Inode Attributes structure, used for notify_change().  It
 303  * uses the above definitions as flags, to know which values have changed.
 304  * Also, in this manner, a Filesystem can look at only the values it cares
 305  * about.  Basically, these are the attributes that the VFS layer can
 306  * request to change from the FS layer.
 307  *
 308  * Derek Atkins <warlord@MIT.EDU> 94-10-20
 309  */
 310 struct iattr {
 311         unsigned int    ia_valid;
 312         umode_t         ia_mode;
 313         uid_t           ia_uid;
 314         gid_t           ia_gid;
 315         off_t           ia_size;
 316         time_t          ia_atime;
 317         time_t          ia_mtime;
 318         time_t          ia_ctime;
 319         unsigned int    ia_attr_flags;
 320 };
 321
 322 /*
 323  * This is the inode attributes flag definitions
 324  */
 325 #define ATTR_FLAG_SYNCRONOUS    1       /* Syncronous write */
 326 #define ATTR_FLAG_NOATIME       2       /* Don't update atime */
 327 #define ATTR_FLAG_APPEND        4       /* Append-only file */
 328 #define ATTR_FLAG_IMMUTABLE     8       /* Immutable file */
 329 #define ATTR_FLAG_NODIRATIME    16      /* Don't update atime for directory */
 330
 331 /*
 332  * Includes for diskquotas and mount structures.
 333  */
 334 #include <linux/quota.h>
 335 #include <linux/mount.h>
 336
 337 struct inode {
 338         struct list_head        i_hash;
 339         struct list_head        i_list;
 340         struct list_head        i_dentry;
 341
 342         unsigned long           i_ino;
 343         unsigned int            i_count;
 344         kdev_t                  i_dev;
 345         umode_t                 i_mode;
 346         nlink_t                 i_nlink;
 347         uid_t                   i_uid;
 348         gid_t                   i_gid;
 349         kdev_t                  i_rdev;
 350         off_t                   i_size;
 351         time_t                  i_atime;
 352         time_t                  i_mtime;
 353         time_t                  i_ctime;
 354         unsigned long           i_blksize;
 355         unsigned long           i_blocks;
 356         unsigned long           i_version;
 357         unsigned long           i_nrpages;
 358         struct semaphore        i_sem;
 359         struct inode_operations *i_op;
 360         struct super_block      *i_sb;
 361         wait_queue_head_t       i_wait;
 362         struct file_lock        *i_flock;
 363         struct vm_area_struct   *i_mmap;
 364         struct page             *i_pages;
 365         struct dquot            *i_dquot[MAXQUOTAS];
 366         struct pipe_inode_info  *i_pipe;
 367
 368         unsigned long           i_state;
 369
 370         unsigned int            i_flags;
 371         unsigned char           i_sock;
 372
 373         int                     i_writecount;
 374         unsigned int            i_attr_flags;
 375         __u32                   i_generation;
 376         union {
 377                 struct minix_inode_info         minix_i;
 378                 struct ext2_inode_info          ext2_i;
 379                 struct hpfs_inode_info          hpfs_i;
 380                 struct ntfs_inode_info          ntfs_i;
 381                 struct msdos_inode_info         msdos_i;
 382                 struct umsdos_inode_info        umsdos_i;
 383                 struct iso_inode_info           isofs_i;
 384                 struct nfs_inode_info           nfs_i;
 385                 struct sysv_inode_info          sysv_i;
 386                 struct affs_inode_info          affs_i;
 387                 struct ufs_inode_info           ufs_i;
 388                 struct efs_inode_info           efs_i;
 389                 struct romfs_inode_info         romfs_i;
 390                 struct coda_inode_info          coda_i;
 391                 struct smb_inode_info           smbfs_i;
 392                 struct hfs_inode_info           hfs_i;
 393                 struct adfs_inode_info          adfs_i;
 394                 struct qnx4_inode_info          qnx4_i;
 395                 struct socket                   socket_i;
 396                 void                            *generic_ip;
 397         } u;
 398 };
 399
 400 /* Inode state bits.. */
 401 #define I_DIRTY         1
 402 #define I_LOCK          2
 403 #define I_FREEING       4
 404
 405 extern void __mark_inode_dirty(struct inode *);
 406 static inline void mark_inode_dirty(struct inode *inode)
 407 {
 408         if (!(inode->i_state & I_DIRTY))
 409                 __mark_inode_dirty(inode);
 410 }
 411
 412 struct fown_struct {
 413         int pid;                /* pid or -pgrp where SIGIO should be sent */
 414         uid_t uid, euid;        /* uid/euid of process setting the owner */
 415         int signum;             /* posix.1b rt signal to be delivered on IO */
 416 };
 417
 418 struct file {
 419         struct file             *f_next, **f_pprev;
 420         struct dentry           *f_dentry;
 421         struct file_operations  *f_op;
 422         mode_t                  f_mode;
 423         loff_t                  f_pos;
 424         unsigned int            f_count, f_flags;
 425         unsigned long           f_reada, f_ramax, f_raend, f_ralen, f_rawin;
 426         struct fown_struct      f_owner;
 427         unsigned int            f_uid, f_gid;
 428         int                     f_error;
 429
 430         unsigned long           f_version;
 431
 432         /* needed for tty driver, and maybe others */
 433         void                    *private_data;
 434 };
 435
 436 extern int init_private_file(struct file *, struct dentry *, int);
 437
 438 #define FL_POSIX        1
 439 #define FL_FLOCK        2
 440 #define FL_BROKEN       4       /* broken flock() emulation */
 441 #define FL_ACCESS       8       /* for processes suspended by mandatory locking */
 442 #define FL_LOCKD        16      /* lock held by rpc.lockd */
 443
 444 /*
 445  * The POSIX file lock owner is determined by
 446  * the "struct files_struct" in the thread group
 447  * (or NULL for no owner - BSD locks).
 448  *
 449  * Lockd stuffs a "host" pointer into this.
 450  */
 451 typedef struct files_struct *fl_owner_t;
 452
 453 struct file_lock {
 454         struct file_lock *fl_next;      /* singly linked list for this inode  */
 455         struct file_lock *fl_nextlink;  /* doubly linked list of all locks */
 456         struct file_lock *fl_prevlink;  /* used to simplify lock removal */
 457         struct file_lock *fl_nextblock; /* circular list of blocked processes */
 458         struct file_lock *fl_prevblock;
 459         fl_owner_t fl_owner;
 460         unsigned int fl_pid;
 461         wait_queue_head_t fl_wait;
 462         struct file *fl_file;
 463         unsigned char fl_flags;
 464         unsigned char fl_type;
 465         off_t fl_start;
 466         off_t fl_end;
 467
 468         void (*fl_notify)(struct file_lock *);  /* unblock callback */
 469
 470         union {
 471                 struct nfs_lock_info    nfs_fl;
 472         } fl_u;
 473 };
 474
 475 extern struct file_lock                 *file_lock_table;
 476
 477 #include <linux/fcntl.h>
 478
 479 extern int fcntl_getlk(unsigned int, struct flock *);
 480 extern int fcntl_setlk(unsigned int, unsigned int, struct flock *);
 481
 482 /* fs/locks.c */
 483 extern void locks_remove_posix(struct file *, fl_owner_t);
 484 extern void locks_remove_flock(struct file *);
 485 extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
 486 extern int posix_lock_file(struct file *, struct file_lock *, unsigned int);
 487 extern void posix_block_lock(struct file_lock *, struct file_lock *);
 488 extern void posix_unblock_lock(struct file_lock *);
 489
 490 struct fasync_struct {
 491         int     magic;
 492         int     fa_fd;
 493         struct  fasync_struct   *fa_next; /* singly linked list */
 494         struct  file            *fa_file;
 495 };
 496
 497 #define FASYNC_MAGIC 0x4601
 498
 499 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
 500
 501 #include <linux/minix_fs_sb.h>
 502 #include <linux/ext2_fs_sb.h>
 503 #include <linux/hpfs_fs_sb.h>
 504 #include <linux/ntfs_fs_sb.h>
 505 #include <linux/msdos_fs_sb.h>
 506 #include <linux/iso_fs_sb.h>
 507 #include <linux/nfs_fs_sb.h>
 508 #include <linux/sysv_fs_sb.h>
 509 #include <linux/affs_fs_sb.h>
 510 #include <linux/ufs_fs_sb.h>
 511 #include <linux/efs_fs_sb.h>
 512 #include <linux/romfs_fs_sb.h>
 513 #include <linux/smb_fs_sb.h>
 514 #include <linux/hfs_fs_sb.h>
 515 #include <linux/adfs_fs_sb.h>
 516 #include <linux/qnx4_fs_sb.h>
 517
 518 extern struct list_head super_blocks;
 519
 520 #define sb_entry(list)  list_entry((list), struct super_block, s_list)
 521 struct super_block {
 522         struct list_head        s_list;         /* Keep this first */
 523         kdev_t                  s_dev;
 524         unsigned long           s_blocksize;
 525         unsigned char           s_blocksize_bits;
 526         unsigned char           s_lock;
 527         unsigned char           s_rd_only;
 528         unsigned char           s_dirt;
 529         struct file_system_type *s_type;
 530         struct super_operations *s_op;
 531         struct dquot_operations *dq_op;
 532         unsigned long           s_flags;
 533         unsigned long           s_magic;
 534         unsigned long           s_time;
 535         struct dentry           *s_root;
 536         wait_queue_head_t       s_wait;
 537
 538         struct inode            *s_ibasket;
 539         short int               s_ibasket_count;
 540         short int               s_ibasket_max;
 541         struct list_head        s_dirty;        /* dirty inodes */
 542
 543         union {
 544                 struct minix_sb_info    minix_sb;
 545                 struct ext2_sb_info     ext2_sb;
 546                 struct hpfs_sb_info     hpfs_sb;
 547                 struct ntfs_sb_info     ntfs_sb;
 548                 struct msdos_sb_info    msdos_sb;
 549                 struct isofs_sb_info    isofs_sb;
 550                 struct nfs_sb_info      nfs_sb;
 551                 struct sysv_sb_info     sysv_sb;
 552                 struct affs_sb_info     affs_sb;
 553                 struct ufs_sb_info      ufs_sb;
 554                 struct efs_sb_info      efs_sb;
 555                 struct romfs_sb_info    romfs_sb;
 556                 struct smb_sb_info      smbfs_sb;
 557                 struct hfs_sb_info      hfs_sb;
 558                 struct adfs_sb_info     adfs_sb;
 559                 struct qnx4_sb_info     qnx4_sb;
 560                 void                    *generic_sbp;
 561         } u;
 562         /*
 563          * The next field is for VFS *only*. No filesystems have any business
 564          * even looking at it. You had been warned.
 565          */
 566         struct semaphore s_vfs_rename_sem;      /* Kludge */
 567 };
 568
 569 /*
 570  * VFS helper functions..
 571  */
 572 extern int vfs_rmdir(struct inode *, struct dentry *);
 573 extern int vfs_unlink(struct inode *, struct dentry *);
 574 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
 575
 576 /*
 577  * This is the "filldir" function type, used by readdir() to let
 578  * the kernel specify what kind of dirent layout it wants to have.
 579  * This allows the kernel to read directories into kernel space or
 580  * to have different dirent layouts depending on the binary type.
 581  */
 582 typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t);
 583
 584 struct file_operations {
 585         loff_t (*llseek) (struct file *, loff_t, int);
 586         ssize_t (*read) (struct file *, char *, size_t, loff_t *);
 587         ssize_t (*write) (struct file *, const char *, size_t, loff_t *);
 588         int (*readdir) (struct file *, void *, filldir_t);
 589         unsigned int (*poll) (struct file *, struct poll_table_struct *);
 590         int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
 591         int (*mmap) (struct file *, struct vm_area_struct *);
 592         int (*open) (struct inode *, struct file *);
 593         int (*flush) (struct file *);
 594         int (*release) (struct inode *, struct file *);
 595         int (*fsync) (struct file *, struct dentry *);
 596         int (*fasync) (int, struct file *, int);
 597         int (*check_media_change) (kdev_t dev);
 598         int (*revalidate) (kdev_t dev);
 599         int (*lock) (struct file *, int, struct file_lock *);
 600 };
 601
 602 struct inode_operations {
 603         struct file_operations * default_file_ops;
 604         int (*create) (struct inode *,struct dentry *,int);
 605         struct dentry * (*lookup) (struct inode *,struct dentry *);
 606         int (*link) (struct dentry *,struct inode *,struct dentry *);
 607         int (*unlink) (struct inode *,struct dentry *);
 608         int (*symlink) (struct inode *,struct dentry *,const char *);
 609         int (*mkdir) (struct inode *,struct dentry *,int);
 610         int (*rmdir) (struct inode *,struct dentry *);
 611         int (*mknod) (struct inode *,struct dentry *,int,int);
 612         int (*rename) (struct inode *, struct dentry *,
 613                         struct inode *, struct dentry *);
 614         int (*readlink) (struct dentry *, char *,int);
 615         struct dentry * (*follow_link) (struct dentry *, struct dentry *, unsigned int);
 616         int (*readpage) (struct file *, struct page *);
 617         int (*writepage) (struct file *, struct page *);
 618         int (*bmap) (struct inode *,int);
 619         void (*truncate) (struct inode *);
 620         int (*permission) (struct inode *, int);
 621         int (*smap) (struct inode *,int);
 622         int (*updatepage) (struct file *, struct page *, unsigned long, unsigned int);
 623         int (*revalidate) (struct dentry *);
 624         int (*flushpage) (struct inode *, struct page *, unsigned long);
 625 };
 626
 627 struct super_operations {
 628         void (*read_inode) (struct inode *);
 629         void (*write_inode) (struct inode *);
 630         void (*put_inode) (struct inode *);
 631         void (*delete_inode) (struct inode *);
 632         int (*notify_change) (struct dentry *, struct iattr *);
 633         void (*put_super) (struct super_block *);
 634         void (*write_super) (struct super_block *);
 635         int (*statfs) (struct super_block *, struct statfs *, int);
 636         int (*remount_fs) (struct super_block *, int *, char *);
 637         void (*clear_inode) (struct inode *);
 638         void (*umount_begin) (struct super_block *);
 639 };
 640
 641 struct dquot_operations {
 642         void (*initialize) (struct inode *, short);
 643         void (*drop) (struct inode *);
 644         int (*alloc_block) (const struct inode *, unsigned long, uid_t, char);
 645         int (*alloc_inode) (const struct inode *, unsigned long, uid_t);
 646         void (*free_block) (const struct inode *, unsigned long);
 647         void (*free_inode) (const struct inode *, unsigned long);
 648         int (*transfer) (struct inode *, struct iattr *, char, uid_t);
 649 };
 650
 651 struct file_system_type {
 652         const char *name;
 653         int fs_flags;
 654         struct super_block *(*read_super) (struct super_block *, void *, int);
 655         struct file_system_type * next;
 656 };
 657
 658 extern int register_filesystem(struct file_system_type *);
 659 extern int unregister_filesystem(struct file_system_type *);
 660
 661
 662 #define FLOCK_VERIFY_READ  1
 663 #define FLOCK_VERIFY_WRITE 2
 664
 665 extern int locks_mandatory_locked(struct inode *);
 666 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
 667
 668 extern inline int locks_verify_locked(struct inode *inode)
 669 {
 670         /* Candidates for mandatory locking have the setgid bit set
 671          * but no group execute bit -  an otherwise meaningless combination.
 672          */
 673         if (IS_MANDLOCK(inode) &&
 674             (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
 675                 return (locks_mandatory_locked(inode));
 676         return (0);
 677 }
 678
 679 extern inline int locks_verify_area(int read_write, struct inode *inode,
 680                                     struct file *filp, loff_t offset,
 681                                     size_t count)
 682 {
 683         /* Candidates for mandatory locking have the setgid bit set
 684          * but no group execute bit -  an otherwise meaningless combination.
 685          */
 686         if (IS_MANDLOCK(inode) &&
 687             (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
 688                 return (locks_mandatory_area(read_write, inode, filp, offset,
 689                                              count));
 690         return (0);
 691 }
 692
 693
 694 /* fs/open.c */
 695
 696 asmlinkage int sys_open(const char *, int, int);
 697 asmlinkage int sys_close(unsigned int);         /* yes, it's really unsigned */
 698 extern int do_truncate(struct dentry *, unsigned long);
 699 extern int get_unused_fd(void);
 700 extern void put_unused_fd(unsigned int);
 701
 702 extern struct file *filp_open(const char *, int, int);
 703 extern int filp_close(struct file *, fl_owner_t id);
 704
 705 extern char * getname(const char *);
 706 #define __getname()     ((char *) __get_free_page(GFP_KERNEL))
 707 #define putname(name)   free_page((unsigned long)(name))
 708
 709 extern void kill_fasync(struct fasync_struct *, int);
 710 extern int register_blkdev(unsigned int, const char *, struct file_operations *);
 711 extern int unregister_blkdev(unsigned int, const char *);
 712 extern int blkdev_open(struct inode *, struct file *);
 713 extern int blkdev_release (struct inode *);
 714 extern struct file_operations def_blk_fops;
 715 extern struct inode_operations blkdev_inode_operations;
 716
 717 /* fs/devices.c */
 718 extern int register_chrdev(unsigned int, const char *, struct file_operations *);
 719 extern int unregister_chrdev(unsigned int, const char *);
 720 extern int chrdev_open(struct inode *, struct file *);
 721 extern struct file_operations def_chr_fops;
 722 extern struct inode_operations chrdev_inode_operations;
 723 extern char * bdevname(kdev_t);
 724 extern char * cdevname(kdev_t);
 725 extern char * kdevname(kdev_t);
 726 extern void init_special_inode(struct inode *, umode_t, int);
 727
 728 extern void init_fifo(struct inode *);
 729 extern struct inode_operations fifo_inode_operations;
 730
 731 /* Invalid inode operations -- fs/bad_inode.c */
 732 extern void make_bad_inode(struct inode *);
 733 extern int is_bad_inode(struct inode *);
 734
 735 extern struct file_operations connecting_fifo_fops;
 736 extern struct file_operations read_fifo_fops;
 737 extern struct file_operations write_fifo_fops;
 738 extern struct file_operations rdwr_fifo_fops;
 739 extern struct file_operations read_pipe_fops;
 740 extern struct file_operations write_pipe_fops;
 741 extern struct file_operations rdwr_pipe_fops;
 742
 743 extern struct file_system_type *get_fs_type(const char *);
 744
 745 extern int fs_may_remount_ro(struct super_block *);
 746 extern int fs_may_mount(kdev_t);
 747
 748 extern struct file *inuse_filps;
 749
 750 extern void set_writetime(struct buffer_head *, int);
 751 extern int try_to_free_buffers(struct page *);
 752 extern void refile_buffer(struct buffer_head * buf);
 753
 754 extern int buffermem;
 755
 756 #define BUF_CLEAN       0
 757 #define BUF_LOCKED      1       /* Buffers scheduled for write */
 758 #define BUF_DIRTY       2       /* Dirty buffers, not yet scheduled for write */
 759 #define NR_LIST         3
 760
 761 void mark_buffer_uptodate(struct buffer_head *, int);
 762
 763 extern inline void mark_buffer_clean(struct buffer_head * bh)
 764 {
 765         if (test_and_clear_bit(BH_Dirty, &bh->b_state)) {
 766                 if (bh->b_list == BUF_DIRTY)
 767                         refile_buffer(bh);
 768         }
 769 }
 770
 771 extern inline void mark_buffer_dirty(struct buffer_head * bh, int flag)
 772 {
 773         if (!test_and_set_bit(BH_Dirty, &bh->b_state)) {
 774                 set_writetime(bh, flag);
 775                 if (bh->b_list != BUF_DIRTY)
 776                         refile_buffer(bh);
 777         }
 778 }
 779
 780 extern int check_disk_change(kdev_t);
 781 extern int invalidate_inodes(struct super_block *);
 782 extern void invalidate_inode_pages(struct inode *);
 783 extern void invalidate_buffers(kdev_t);
 784 extern int floppy_is_wp(int);
 785 extern void sync_inodes(kdev_t);
 786 extern void write_inode_now(struct inode *);
 787 extern void sync_dev(kdev_t);
 788 extern int fsync_dev(kdev_t);
 789 extern void sync_supers(kdev_t);
 790 extern int bmap(struct inode *, int);
 791 extern int notify_change(struct dentry *, struct iattr *);
 792 extern int permission(struct inode *, int);
 793 extern int get_write_access(struct inode *);
 794 extern void put_write_access(struct inode *);
 795 extern struct dentry * open_namei(const char *, int, int);
 796 extern struct dentry * do_mknod(const char *, int, dev_t);
 797 extern int do_pipe(int *);
 798
 799 /* fs/dcache.c -- generic fs support functions */
 800 extern int is_subdir(struct dentry *, struct dentry *);
 801 extern ino_t find_inode_number(struct dentry *, struct qstr *);
 802
 803 /*
 804  * Kernel pointers have redundant information, so we can use a
 805  * scheme where we can return either an error code or a dentry
 806  * pointer with the same return value.
 807  *
 808  * This should be a per-architecture thing, to allow different
 809  * error and pointer decisions.
 810  */
 811 #define ERR_PTR(err)    ((void *)((long)(err)))
 812 #define PTR_ERR(ptr)    ((long)(ptr))
 813 #define IS_ERR(ptr)     ((unsigned long)(ptr) > (unsigned long)(-1000))
 814
 815 /*
 816  * The bitmask for a lookup event:
 817  *  - follow links at the end
 818  *  - require a directory
 819  *  - ending slashes ok even for nonexistent files
 820  *  - internal "there are more path compnents" flag
 821  */
 822 #define LOOKUP_FOLLOW           (1)
 823 #define LOOKUP_DIRECTORY        (2)
 824 #define LOOKUP_SLASHOK          (4)
 825 #define LOOKUP_CONTINUE         (8)
 826
 827 extern struct dentry * lookup_dentry(const char *, struct dentry *, unsigned int);
 828 extern struct dentry * __namei(const char *, unsigned int);
 829
 830 #define namei(pathname)         __namei(pathname, 1)
 831 #define lnamei(pathname)        __namei(pathname, 0)
 832
 833 extern void iput(struct inode *);
 834 extern struct inode * igrab(struct inode *);
 835 extern ino_t iunique(struct super_block *, ino_t);
 836 extern struct inode * iget(struct super_block *, unsigned long);
 837 extern void clear_inode(struct inode *);
 838 extern struct inode * get_empty_inode(void);
 839
 840 extern void insert_inode_hash(struct inode *);
 841 extern void remove_inode_hash(struct inode *);
 842 extern struct file * get_empty_filp(void);
 843 extern struct buffer_head * get_hash_table(kdev_t, int, int);
 844 extern struct buffer_head * getblk(kdev_t, int, int);
 845 extern struct buffer_head * find_buffer(kdev_t, int, int);
 846 extern void ll_rw_block(int, int, struct buffer_head * bh[]);
 847 extern int is_read_only(kdev_t);
 848 extern void __brelse(struct buffer_head *);
 849 extern inline void brelse(struct buffer_head *buf)
 850 {
 851         if (buf)
 852                 __brelse(buf);
 853 }
 854 extern void __bforget(struct buffer_head *);
 855 extern inline void bforget(struct buffer_head *buf)
 856 {
 857         if (buf)
 858                 __bforget(buf);
 859 }
 860 extern void set_blocksize(kdev_t, int);
 861 extern unsigned int get_hardblocksize(kdev_t);
 862 extern struct buffer_head * bread(kdev_t, int, int);
 863 extern struct buffer_head * breada(kdev_t, int, int, unsigned int, unsigned int);
 864
 865 extern int brw_page(int, struct page *, kdev_t, int [], int, int);
 866
 867 typedef long (*writepage_t)(struct file *, struct page *, unsigned long, unsigned long, const char *);
 868 typedef int (*fs_getblock_t)(struct inode *, long, int, int *, int *);
 869
 870
 871 extern int generic_readpage(struct file *, struct page *);
 872 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
 873 extern ssize_t generic_file_read(struct file *, char *, size_t, loff_t *);
 874 extern ssize_t generic_file_write(struct file *, const char *, size_t, loff_t *, writepage_t);
 875 extern int generic_block_flushpage(struct inode *, struct page *, unsigned long);
 876 extern int block_write_one_page (struct file *file, struct page *page, unsigned long offset, unsigned long bytes, const char * buf, fs_getblock_t fs_get_block);
 877 extern int block_write_full_page (struct file *file, struct page *page, fs_getblock_t fs_get_block);
 878
 879
 880 extern struct super_block *get_super(kdev_t);
 881 extern void put_super(kdev_t);
 882 unsigned long generate_cluster(kdev_t, int b[], int);
 883 unsigned long generate_cluster_swab32(kdev_t, int b[], int);
 884 extern kdev_t ROOT_DEV;
 885
 886 extern void show_buffers(void);
 887 extern void mount_root(void);
 888
 889 #ifdef CONFIG_BLK_DEV_INITRD
 890 extern kdev_t real_root_dev;
 891 extern int change_root(kdev_t, const char *);
 892 #endif
 893
 894 extern ssize_t char_read(struct file *, char *, size_t, loff_t *);
 895 extern ssize_t block_read(struct file *, char *, size_t, loff_t *);
 896 extern int read_ahead[];
 897
 898 extern ssize_t char_write(struct file *, const char *, size_t, loff_t *);
 899 extern ssize_t block_write(struct file *, const char *, size_t, loff_t *);
 900
 901 extern int block_fsync(struct file *, struct dentry *);
 902 extern int file_fsync(struct file *, struct dentry *);
 903 extern int generic_buffer_fdatasync(struct inode *inode, unsigned long start, unsigned long end);
 904
 905 extern int inode_change_ok(struct inode *, struct iattr *);
 906 extern void inode_setattr(struct inode *, struct iattr *);
 907
 908 /* kludge to get SCSI modules working */
 909 #include <linux/minix_fs.h>
 910 #include <linux/minix_fs_sb.h>
 911
 912 #endif /* __KERNEL__ */
 913
 914 #endif /* _LINUX_FS_H */