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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 | #ifndef _LINUX_FS_H #define _LINUX_FS_H /* * This file has definitions for some important file table * structures etc. */ #include <linux/linkage.h> #include <linux/limits.h> #include <linux/wait.h> #include <linux/types.h> #include <linux/vfs.h> #include <linux/net.h> #include <linux/kdev_t.h> #include <linux/ioctl.h> #include <asm/bitops.h> /* * It's silly to have NR_OPEN bigger than NR_FILE, but I'll fix * that later. Anyway, now the file code is no longer dependent * on bitmaps in unsigned longs, but uses the new fd_set structure.. * * Some programs (notably those using select()) may have to be * recompiled to take full advantage of the new limits.. */ #undef NR_OPEN #define NR_OPEN 256 #define NR_INODE 2048 /* this should be bigger than NR_FILE */ #define NR_FILE 1024 /* this can well be larger on a larger system */ #define NR_SUPER 32 #define NR_IHASH 131 #define BLOCK_SIZE 1024 #define BLOCK_SIZE_BITS 10 #define MAY_EXEC 1 #define MAY_WRITE 2 #define MAY_READ 4 #define READ 0 #define WRITE 1 #define READA 2 /* read-ahead - don't pause */ #define WRITEA 3 /* "write-ahead" - silly, but somewhat useful */ #ifndef NULL #define NULL ((void *) 0) #endif #define NIL_FILP ((struct file *)0) #define SEL_IN 1 #define SEL_OUT 2 #define SEL_EX 4 /* * These are the fs-independent mount-flags: up to 16 flags are supported */ #define MS_RDONLY 1 /* mount read-only */ #define MS_NOSUID 2 /* ignore suid and sgid bits */ #define MS_NODEV 4 /* disallow access to device special files */ #define MS_NOEXEC 8 /* disallow program execution */ #define MS_SYNCHRONOUS 16 /* writes are synced at once */ #define MS_REMOUNT 32 /* alter flags of a mounted FS */ #define S_APPEND 256 /* append-only file */ #define S_IMMUTABLE 512 /* immutable file */ /* * Flags that can be altered by MS_REMOUNT */ #define MS_RMT_MASK (MS_RDONLY) /* * Magic mount flag number. Has to be or-ed to the flag values. */ #define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */ #define MS_MGC_MSK 0xffff0000 /* magic flag number mask */ /* * Note that read-only etc flags are inode-specific: setting some file-system * flags just means all the inodes inherit those flags by default. It might be * possible to override it selectively if you really wanted to with some * ioctl() that is not currently implemented. * * Exception: MS_RDONLY is always applied to the entire file system. */ #define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY)) #define IS_NOSUID(inode) ((inode)->i_flags & MS_NOSUID) #define IS_NODEV(inode) ((inode)->i_flags & MS_NODEV) #define IS_NOEXEC(inode) ((inode)->i_flags & MS_NOEXEC) #define IS_SYNC(inode) ((inode)->i_flags & MS_SYNCHRONOUS) #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) /* the read-only stuff doesn't really belong here, but any other place is probably as bad and I don't want to create yet another include file. */ #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ #define BLKRRPART _IO(0x12,95) /* re-read partition table */ #define BLKGETSIZE _IO(0x12,96) /* return device size */ #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ #define BLKRASET _IO(0x12,98) /* Set read ahead for block device */ #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ #define FIBMAP _IO(0x00,1) /* bmap access */ #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ #ifdef __KERNEL__ extern void buffer_init(void); extern unsigned long inode_init(unsigned long start, unsigned long end); extern unsigned long file_table_init(unsigned long start, unsigned long end); extern unsigned long name_cache_init(unsigned long start, unsigned long end); typedef char buffer_block[BLOCK_SIZE]; /* bh state bits */ #define BH_Uptodate 0 /* 1 if the buffer contains valid data */ #define BH_Dirty 1 /* 1 if the buffer is dirty */ #define BH_Lock 2 /* 1 if the buffer is locked */ #define BH_Req 3 /* 0 if the buffer has been invalidated */ #define BH_Touched 4 /* 1 if the buffer has been touched (aging) */ #define BH_Has_aged 5 /* 1 if the buffer has been aged (aging) */ struct buffer_head { char * b_data; /* pointer to data block (1024 bytes) */ unsigned long b_size; /* block size */ unsigned long b_blocknr; /* block number */ kdev_t b_dev; /* device (B_FREE = free) */ unsigned long b_state; /* buffer state bitmap (see above) */ unsigned int b_count; /* users using this block */ unsigned int b_list; /* List that this buffer appears */ unsigned long b_flushtime; /* Time when this (dirty) buffer * should be written */ unsigned long b_lru_time; /* Time when this buffer was * last used. */ struct wait_queue * b_wait; struct buffer_head * b_prev; /* doubly linked list of hash-queue */ struct buffer_head * b_next; struct buffer_head * b_prev_free; /* doubly linked list of buffers */ struct buffer_head * b_next_free; struct buffer_head * b_this_page; /* circular list of buffers in one page */ struct buffer_head * b_reqnext; /* request queue */ }; static inline int buffer_uptodate(struct buffer_head * bh) { return test_bit(BH_Uptodate, &bh->b_state); } static inline int buffer_dirty(struct buffer_head * bh) { return test_bit(BH_Dirty, &bh->b_state); } static inline int buffer_locked(struct buffer_head * bh) { return test_bit(BH_Lock, &bh->b_state); } static inline int buffer_req(struct buffer_head * bh) { return test_bit(BH_Req, &bh->b_state); } static inline int buffer_touched(struct buffer_head * bh) { return test_bit(BH_Touched, &bh->b_state); } static inline int buffer_has_aged(struct buffer_head * bh) { return test_bit(BH_Has_aged, &bh->b_state); } #include <linux/pipe_fs_i.h> #include <linux/minix_fs_i.h> #include <linux/ext_fs_i.h> #include <linux/ext2_fs_i.h> #include <linux/hpfs_fs_i.h> #include <linux/msdos_fs_i.h> #include <linux/umsdos_fs_i.h> #include <linux/iso_fs_i.h> #include <linux/nfs_fs_i.h> #include <linux/xia_fs_i.h> #include <linux/sysv_fs_i.h> /* * Attribute flags. These should be or-ed together to figure out what * has been changed! */ #define ATTR_MODE 1 #define ATTR_UID 2 #define ATTR_GID 4 #define ATTR_SIZE 8 #define ATTR_ATIME 16 #define ATTR_MTIME 32 #define ATTR_CTIME 64 #define ATTR_ATIME_SET 128 #define ATTR_MTIME_SET 256 /* * This is the Inode Attributes structure, used for notify_change(). It * uses the above definitions as flags, to know which values have changed. * Also, in this manner, a Filesystem can look at only the values it cares * about. Basically, these are the attributes that the VFS layer can * request to change from the FS layer. * * Derek Atkins <warlord@MIT.EDU> 94-10-20 */ struct iattr { unsigned int ia_valid; umode_t ia_mode; uid_t ia_uid; gid_t ia_gid; off_t ia_size; time_t ia_atime; time_t ia_mtime; time_t ia_ctime; }; struct inode { kdev_t i_dev; unsigned long i_ino; umode_t i_mode; nlink_t i_nlink; uid_t i_uid; gid_t i_gid; kdev_t i_rdev; off_t i_size; time_t i_atime; time_t i_mtime; time_t i_ctime; unsigned long i_blksize; unsigned long i_blocks; unsigned long i_version; struct semaphore i_sem; struct inode_operations * i_op; struct super_block * i_sb; struct wait_queue * i_wait; struct file_lock * i_flock; struct vm_area_struct * i_mmap; struct inode * i_next, * i_prev; struct inode * i_hash_next, * i_hash_prev; struct inode * i_bound_to, * i_bound_by; struct inode * i_mount; unsigned short i_count; unsigned short i_wcount; unsigned short i_flags; unsigned char i_lock; unsigned char i_dirt; unsigned char i_pipe; unsigned char i_sock; unsigned char i_seek; unsigned char i_update; union { struct pipe_inode_info pipe_i; struct minix_inode_info minix_i; struct ext_inode_info ext_i; struct ext2_inode_info ext2_i; struct hpfs_inode_info hpfs_i; struct msdos_inode_info msdos_i; struct umsdos_inode_info umsdos_i; struct iso_inode_info isofs_i; struct nfs_inode_info nfs_i; struct xiafs_inode_info xiafs_i; struct sysv_inode_info sysv_i; struct socket socket_i; void * generic_ip; } u; }; struct file { mode_t f_mode; loff_t f_pos; unsigned short f_flags; unsigned short f_count; off_t f_reada; struct file *f_next, *f_prev; int f_owner; /* pid or -pgrp where SIGIO should be sent */ struct inode * f_inode; struct file_operations * f_op; unsigned long f_version; void *private_data; /* needed for tty driver, and maybe others */ }; struct file_lock { struct file_lock *fl_next; /* singly linked list for this inode */ struct file_lock *fl_nextlink; /* doubly linked list of all locks */ struct file_lock *fl_prevlink; /* used to simplify lock removal */ struct file_lock *fl_block; struct task_struct *fl_owner; struct wait_queue *fl_wait; struct file *fl_file; char fl_flags; char fl_type; off_t fl_start; off_t fl_end; }; struct fasync_struct { int magic; struct fasync_struct *fa_next; /* singly linked list */ struct file *fa_file; }; #define FASYNC_MAGIC 0x4601 extern int fasync_helper(struct inode *, struct file *, int, struct fasync_struct **); #include <linux/minix_fs_sb.h> #include <linux/ext_fs_sb.h> #include <linux/ext2_fs_sb.h> #include <linux/hpfs_fs_sb.h> #include <linux/msdos_fs_sb.h> #include <linux/iso_fs_sb.h> #include <linux/nfs_fs_sb.h> #include <linux/xia_fs_sb.h> #include <linux/sysv_fs_sb.h> struct super_block { kdev_t s_dev; unsigned long s_blocksize; unsigned char s_blocksize_bits; unsigned char s_lock; unsigned char s_rd_only; unsigned char s_dirt; struct file_system_type *s_type; struct super_operations *s_op; unsigned long s_flags; unsigned long s_magic; unsigned long s_time; struct inode * s_covered; struct inode * s_mounted; struct wait_queue * s_wait; union { struct minix_sb_info minix_sb; struct ext_sb_info ext_sb; struct ext2_sb_info ext2_sb; struct hpfs_sb_info hpfs_sb; struct msdos_sb_info msdos_sb; struct isofs_sb_info isofs_sb; struct nfs_sb_info nfs_sb; struct xiafs_sb_info xiafs_sb; struct sysv_sb_info sysv_sb; void *generic_sbp; } u; }; /* * This is the "filldir" function type, used by readdir() to let * the kernel specify what kind of dirent layout it wants to have. * This allows the kernel to read directories into kernel space or * to have different dirent layouts depending on the binary type. */ typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t); struct file_operations { int (*lseek) (struct inode *, struct file *, off_t, int); int (*read) (struct inode *, struct file *, char *, int); int (*write) (struct inode *, struct file *, const char *, int); int (*readdir) (struct inode *, struct file *, void *, filldir_t); int (*select) (struct inode *, struct file *, int, select_table *); int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); int (*mmap) (struct inode *, struct file *, struct vm_area_struct *); int (*open) (struct inode *, struct file *); void (*release) (struct inode *, struct file *); int (*fsync) (struct inode *, struct file *); int (*fasync) (struct inode *, struct file *, int); int (*check_media_change) (kdev_t dev); int (*revalidate) (kdev_t dev); }; struct inode_operations { struct file_operations * default_file_ops; int (*create) (struct inode *,const char *,int,int,struct inode **); int (*lookup) (struct inode *,const char *,int,struct inode **); int (*link) (struct inode *,struct inode *,const char *,int); int (*unlink) (struct inode *,const char *,int); int (*symlink) (struct inode *,const char *,int,const char *); int (*mkdir) (struct inode *,const char *,int,int); int (*rmdir) (struct inode *,const char *,int); int (*mknod) (struct inode *,const char *,int,int,int); int (*rename) (struct inode *,const char *,int,struct inode *,const char *,int); int (*readlink) (struct inode *,char *,int); int (*follow_link) (struct inode *,struct inode *,int,int,struct inode **); int (*bmap) (struct inode *,int); void (*truncate) (struct inode *); int (*permission) (struct inode *, int); int (*smap) (struct inode *,int); }; struct super_operations { void (*read_inode) (struct inode *); int (*notify_change) (struct inode *, struct iattr *); void (*write_inode) (struct inode *); void (*put_inode) (struct inode *); void (*put_super) (struct super_block *); void (*write_super) (struct super_block *); void (*statfs) (struct super_block *, struct statfs *, int); int (*remount_fs) (struct super_block *, int *, char *); }; struct file_system_type { struct super_block *(*read_super) (struct super_block *, void *, int); const char *name; int requires_dev; struct file_system_type * next; }; extern int register_filesystem(struct file_system_type *); extern int unregister_filesystem(struct file_system_type *); asmlinkage int sys_open(const char *, int, int); asmlinkage int sys_close(unsigned int); /* yes, it's really unsigned */ extern void kill_fasync(struct fasync_struct *fa, int sig); extern int getname(const char * filename, char **result); extern void putname(char * name); extern int register_blkdev(unsigned int, const char *, struct file_operations *); extern int unregister_blkdev(unsigned int major, const char * name); extern int blkdev_open(struct inode * inode, struct file * filp); extern struct file_operations def_blk_fops; extern struct inode_operations blkdev_inode_operations; extern int register_chrdev(unsigned int, const char *, struct file_operations *); extern int unregister_chrdev(unsigned int major, const char * name); extern int chrdev_open(struct inode * inode, struct file * filp); extern struct file_operations def_chr_fops; extern struct inode_operations chrdev_inode_operations; extern void init_fifo(struct inode * inode); extern struct file_operations connecting_fifo_fops; extern struct file_operations read_fifo_fops; extern struct file_operations write_fifo_fops; extern struct file_operations rdwr_fifo_fops; extern struct file_operations read_pipe_fops; extern struct file_operations write_pipe_fops; extern struct file_operations rdwr_pipe_fops; extern struct file_system_type *get_fs_type(const char *name); extern int fs_may_mount(kdev_t dev); extern int fs_may_umount(kdev_t dev, struct inode * mount_root); extern int fs_may_remount_ro(kdev_t dev); extern struct file *first_file; extern int nr_files; extern struct super_block super_blocks[NR_SUPER]; extern int shrink_buffers(unsigned int priority, unsigned long limit); extern void refile_buffer(struct buffer_head * buf); extern void set_writetime(struct buffer_head * buf, int flag); extern void refill_freelist(int size); extern struct buffer_head ** buffer_pages; extern int nr_buffers; extern int buffermem; extern int nr_buffer_heads; #define BUF_CLEAN 0 #define BUF_UNSHARED 1 /* Buffers that were shared but are not any more */ #define BUF_LOCKED 2 /* Buffers scheduled for write */ #define BUF_LOCKED1 3 /* Supers, inodes */ #define BUF_DIRTY 4 /* Dirty buffers, not yet scheduled for write */ #define BUF_SHARED 5 /* Buffers shared */ #define NR_LIST 6 extern inline void mark_buffer_uptodate(struct buffer_head * bh, int on) { if (on) set_bit(BH_Uptodate, &bh->b_state); else clear_bit(BH_Uptodate, &bh->b_state); } extern inline void mark_buffer_clean(struct buffer_head * bh) { if (clear_bit(BH_Dirty, &bh->b_state)) { if (bh->b_list == BUF_DIRTY) refile_buffer(bh); } } extern inline void mark_buffer_dirty(struct buffer_head * bh, int flag) { if (!set_bit(BH_Dirty, &bh->b_state)) { set_writetime(bh, flag); if (bh->b_list != BUF_DIRTY) refile_buffer(bh); } } extern int check_disk_change(kdev_t dev); extern void invalidate_inodes(kdev_t dev); extern void invalidate_buffers(kdev_t dev); extern int floppy_is_wp(int minor); extern void sync_inodes(kdev_t dev); extern void sync_dev(kdev_t dev); extern int fsync_dev(kdev_t dev); extern void sync_supers(kdev_t dev); extern int bmap(struct inode * inode,int block); extern int notify_change(struct inode *, struct iattr *); extern int namei(const char * pathname, struct inode ** res_inode); extern int lnamei(const char * pathname, struct inode ** res_inode); extern int permission(struct inode * inode,int mask); extern int get_write_access(struct inode * inode); extern void put_write_access(struct inode * inode); extern int open_namei(const char * pathname, int flag, int mode, struct inode ** res_inode, struct inode * base); extern int do_mknod(const char * filename, int mode, dev_t dev); extern int do_pipe(int *); extern void iput(struct inode * inode); extern struct inode * __iget(struct super_block * sb,int nr,int crsmnt); extern struct inode * get_empty_inode(void); extern void insert_inode_hash(struct inode *); extern void clear_inode(struct inode *); extern struct inode * get_pipe_inode(void); extern struct file * get_empty_filp(void); extern int close_fp(struct file *filp); extern struct buffer_head * get_hash_table(kdev_t dev, int block, int size); extern struct buffer_head * getblk(kdev_t dev, int block, int size); extern void ll_rw_block(int rw, int nr, struct buffer_head * bh[]); extern void ll_rw_page(int rw, kdev_t dev, unsigned long nr, char * buffer); extern void ll_rw_swap_file(int rw, kdev_t dev, unsigned int *b, int nb, char *buffer); extern int is_read_only(kdev_t dev); extern void __brelse(struct buffer_head *buf); extern inline void brelse(struct buffer_head *buf) { if (buf) __brelse(buf); } extern void __bforget(struct buffer_head *buf); extern inline void bforget(struct buffer_head *buf) { if (buf) __bforget(buf); } extern void set_blocksize(kdev_t dev, int size); extern struct buffer_head * bread(kdev_t dev, int block, int size); extern unsigned long bread_page(unsigned long addr,kdev_t dev,int b[],int size,int no_share); extern void bwrite_page(unsigned long addr,kdev_t dev,int b[],int size); extern struct buffer_head * breada(kdev_t dev,int block, int size, unsigned int pos, unsigned int filesize); extern void put_super(kdev_t dev); unsigned long generate_cluster(kdev_t dev, int b[], int size); extern kdev_t ROOT_DEV; extern void show_buffers(void); extern void mount_root(void); extern int char_read(struct inode *, struct file *, char *, int); extern int block_read(struct inode *, struct file *, char *, int); extern int read_ahead[]; extern int char_write(struct inode *, struct file *, const char *, int); extern int block_write(struct inode *, struct file *, const char *, int); extern int generic_mmap(struct inode *, struct file *, struct vm_area_struct *); extern int block_fsync(struct inode *, struct file *); extern int file_fsync(struct inode *, struct file *); extern void dcache_add(struct inode *, const char *, int, unsigned long); extern int dcache_lookup(struct inode *, const char *, int, unsigned long *); extern int inode_change_ok(struct inode *, struct iattr *); extern void inode_setattr(struct inode *, struct iattr *); extern inline struct inode * iget(struct super_block * sb,int nr) { return __iget(sb,nr,1); } #endif /* __KERNEL__ */ #endif |