Import 2.3.6
[davej-history.git] / include / linux / fs.h
blob55b07ba486ec96f13ed39fcbce29b0a11f210ac2
1 #ifndef _LINUX_FS_H
2 #define _LINUX_FS_H
4 /*
5 * This file has definitions for some important file table
6 * structures etc.
7 */
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>
22 #include <asm/atomic.h>
23 #include <asm/bitops.h>
24 #include <asm/cache.h>
26 struct poll_table_struct;
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..
34 * Some programs (notably those using select()) may have to be
35 * recompiled to take full advantage of the new limits..
38 /* Fixed constants first: */
39 #undef NR_OPEN
40 #define NR_OPEN 1024
42 #define BLOCK_SIZE_BITS 10
43 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
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;
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
54 #define MAY_EXEC 1
55 #define MAY_WRITE 2
56 #define MAY_READ 4
58 #define FMODE_READ 1
59 #define FMODE_WRITE 2
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 */
66 #ifndef NULL
67 #define NULL ((void *) 0)
68 #endif
70 #define NIL_FILP ((struct file *)0)
71 #define SEL_IN 1
72 #define SEL_OUT 2
73 #define SEL_EX 4
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.
81 #define FS_IBASKET 8 /* FS does callback to free_ibasket() if space gets low. */
84 * These are the fs-independent mount-flags: up to 16 flags are supported
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 */
99 #define MS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
100 * as nfs_rename() will be cleaned up
104 * Flags that can be altered by MS_REMOUNT
106 #define MS_RMT_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|\
107 MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME)
110 * Magic mount flag number. Has to be or-ed to the flag values.
112 #define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */
113 #define MS_MGC_MSK 0xffff0000 /* magic flag number mask */
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.
121 * Exception: MS_RDONLY is always applied to the entire file system.
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
128 #define __IS_FLG(inode,flg) (((inode)->i_sb && (inode)->i_sb->s_flags & (flg)) \
129 || (inode)->i_flags & (flg))
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)
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)
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. */
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
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 */
171 #ifdef __KERNEL__
173 #include <asm/semaphore.h>
174 #include <asm/byteorder.h>
176 extern void update_atime (struct inode *);
177 #define UPDATE_ATIME(inode) update_atime (inode)
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);
184 typedef char buffer_block[BLOCK_SIZE];
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 */
194 * Try to keep the most commonly used fields in single cache lines (16
195 * bytes) to improve performance. This ordering should be
196 * particularly beneficial on 32-bit processors.
198 * We use the first 16 bytes for the data which is used in searches
199 * over the block hash lists (ie. getblk(), find_buffer() and
200 * friends).
202 * The second 16 bytes we use for lru buffer scans, as used by
203 * sync_buffers() and refill_freelist(). -- sct
205 struct buffer_head {
206 /* First cache line: */
207 struct buffer_head * b_next; /* Hash queue list */
208 unsigned long b_blocknr; /* block number */
209 unsigned long b_size; /* block size */
210 kdev_t b_dev; /* device (B_FREE = free) */
211 kdev_t b_rdev; /* Real device */
212 unsigned long b_rsector; /* Real buffer location on disk */
213 struct buffer_head * b_this_page; /* circular list of buffers in one page */
214 unsigned long b_state; /* buffer state bitmap (see above) */
215 struct buffer_head * b_next_free;
216 unsigned int b_count; /* users using this block */
218 /* Non-performance-critical data follows. */
219 char * b_data; /* pointer to data block (1024 bytes) */
220 unsigned int b_list; /* List that this buffer appears */
221 unsigned long b_flushtime; /* Time when this (dirty) buffer
222 * should be written */
223 wait_queue_head_t b_wait;
224 struct buffer_head ** b_pprev; /* doubly linked list of hash-queue */
225 struct buffer_head * b_prev_free; /* doubly linked list of buffers */
226 struct buffer_head * b_reqnext; /* request queue */
229 * I/O completion
231 void (*b_end_io)(struct buffer_head *bh, int uptodate);
232 void *b_dev_id;
235 typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate);
236 void init_buffer(struct buffer_head *, kdev_t, int, bh_end_io_t *, void *);
238 static inline int buffer_uptodate(struct buffer_head * bh)
240 return test_bit(BH_Uptodate, &bh->b_state);
243 static inline int buffer_dirty(struct buffer_head * bh)
245 return test_bit(BH_Dirty, &bh->b_state);
248 static inline int buffer_locked(struct buffer_head * bh)
250 return test_bit(BH_Lock, &bh->b_state);
253 static inline int buffer_req(struct buffer_head * bh)
255 return test_bit(BH_Req, &bh->b_state);
258 static inline int buffer_protected(struct buffer_head * bh)
260 return test_bit(BH_Protected, &bh->b_state);
263 #define buffer_page(bh) (mem_map + MAP_NR((bh)->b_data))
264 #define touch_buffer(bh) set_bit(PG_referenced, &buffer_page(bh)->flags)
266 #include <linux/pipe_fs_i.h>
267 #include <linux/minix_fs_i.h>
268 #include <linux/ext2_fs_i.h>
269 #include <linux/hpfs_fs_i.h>
270 #include <linux/ntfs_fs_i.h>
271 #include <linux/msdos_fs_i.h>
272 #include <linux/umsdos_fs_i.h>
273 #include <linux/iso_fs_i.h>
274 #include <linux/nfs_fs_i.h>
275 #include <linux/sysv_fs_i.h>
276 #include <linux/affs_fs_i.h>
277 #include <linux/ufs_fs_i.h>
278 #include <linux/efs_fs_i.h>
279 #include <linux/coda_fs_i.h>
280 #include <linux/romfs_fs_i.h>
281 #include <linux/smb_fs_i.h>
282 #include <linux/hfs_fs_i.h>
283 #include <linux/adfs_fs_i.h>
284 #include <linux/qnx4_fs_i.h>
287 * Attribute flags. These should be or-ed together to figure out what
288 * has been changed!
290 #define ATTR_MODE 1
291 #define ATTR_UID 2
292 #define ATTR_GID 4
293 #define ATTR_SIZE 8
294 #define ATTR_ATIME 16
295 #define ATTR_MTIME 32
296 #define ATTR_CTIME 64
297 #define ATTR_ATIME_SET 128
298 #define ATTR_MTIME_SET 256
299 #define ATTR_FORCE 512 /* Not a change, but a change it */
300 #define ATTR_ATTR_FLAG 1024
303 * This is the Inode Attributes structure, used for notify_change(). It
304 * uses the above definitions as flags, to know which values have changed.
305 * Also, in this manner, a Filesystem can look at only the values it cares
306 * about. Basically, these are the attributes that the VFS layer can
307 * request to change from the FS layer.
309 * Derek Atkins <warlord@MIT.EDU> 94-10-20
311 struct iattr {
312 unsigned int ia_valid;
313 umode_t ia_mode;
314 uid_t ia_uid;
315 gid_t ia_gid;
316 off_t ia_size;
317 time_t ia_atime;
318 time_t ia_mtime;
319 time_t ia_ctime;
320 unsigned int ia_attr_flags;
324 * This is the inode attributes flag definitions
326 #define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */
327 #define ATTR_FLAG_NOATIME 2 /* Don't update atime */
328 #define ATTR_FLAG_APPEND 4 /* Append-only file */
329 #define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */
330 #define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */
333 * Includes for diskquotas and mount structures.
335 #include <linux/quota.h>
336 #include <linux/mount.h>
338 struct inode {
339 struct list_head i_hash;
340 struct list_head i_list;
341 struct list_head i_dentry;
343 unsigned long i_ino;
344 unsigned int i_count;
345 kdev_t i_dev;
346 umode_t i_mode;
347 nlink_t i_nlink;
348 uid_t i_uid;
349 gid_t i_gid;
350 kdev_t i_rdev;
351 off_t i_size;
352 time_t i_atime;
353 time_t i_mtime;
354 time_t i_ctime;
355 unsigned long i_blksize;
356 unsigned long i_blocks;
357 unsigned long i_version;
358 unsigned long i_nrpages;
359 struct semaphore i_sem;
360 struct semaphore i_atomic_write;
361 struct inode_operations *i_op;
362 struct super_block *i_sb;
363 wait_queue_head_t i_wait;
364 struct file_lock *i_flock;
365 struct vm_area_struct *i_mmap;
366 struct page *i_pages;
367 struct dquot *i_dquot[MAXQUOTAS];
369 unsigned long i_state;
371 unsigned int i_flags;
372 unsigned char i_pipe;
373 unsigned char i_sock;
375 int i_writecount;
376 unsigned int i_attr_flags;
377 __u32 i_generation;
378 union {
379 struct pipe_inode_info pipe_i;
380 struct minix_inode_info minix_i;
381 struct ext2_inode_info ext2_i;
382 struct hpfs_inode_info hpfs_i;
383 struct ntfs_inode_info ntfs_i;
384 struct msdos_inode_info msdos_i;
385 struct umsdos_inode_info umsdos_i;
386 struct iso_inode_info isofs_i;
387 struct nfs_inode_info nfs_i;
388 struct sysv_inode_info sysv_i;
389 struct affs_inode_info affs_i;
390 struct ufs_inode_info ufs_i;
391 struct efs_inode_info efs_i;
392 struct romfs_inode_info romfs_i;
393 struct coda_inode_info coda_i;
394 struct smb_inode_info smbfs_i;
395 struct hfs_inode_info hfs_i;
396 struct adfs_inode_info adfs_i;
397 struct qnx4_inode_info qnx4_i;
398 struct socket socket_i;
399 void *generic_ip;
400 } u;
403 /* Inode state bits.. */
404 #define I_DIRTY 1
405 #define I_LOCK 2
406 #define I_FREEING 4
408 extern void __mark_inode_dirty(struct inode *);
409 static inline void mark_inode_dirty(struct inode *inode)
411 if (!(inode->i_state & I_DIRTY))
412 __mark_inode_dirty(inode);
415 struct fown_struct {
416 int pid; /* pid or -pgrp where SIGIO should be sent */
417 uid_t uid, euid; /* uid/euid of process setting the owner */
418 int signum; /* posix.1b rt signal to be delivered on IO */
421 struct file {
422 struct file *f_next, **f_pprev;
423 struct dentry *f_dentry;
424 struct file_operations *f_op;
425 mode_t f_mode;
426 loff_t f_pos;
427 unsigned int f_count, f_flags;
428 unsigned long f_reada, f_ramax, f_raend, f_ralen, f_rawin;
429 struct fown_struct f_owner;
430 unsigned int f_uid, f_gid;
431 int f_error;
433 unsigned long f_version;
435 /* needed for tty driver, and maybe others */
436 void *private_data;
439 extern int init_private_file(struct file *, struct dentry *, int);
441 #define FL_POSIX 1
442 #define FL_FLOCK 2
443 #define FL_BROKEN 4 /* broken flock() emulation */
444 #define FL_ACCESS 8 /* for processes suspended by mandatory locking */
445 #define FL_LOCKD 16 /* lock held by rpc.lockd */
448 * The POSIX file lock owner is determined by
449 * the "struct files_struct" in the thread group
450 * (or NULL for no owner - BSD locks).
452 * Lockd stuffs a "host" pointer into this.
454 typedef struct files_struct *fl_owner_t;
456 struct file_lock {
457 struct file_lock *fl_next; /* singly linked list for this inode */
458 struct file_lock *fl_nextlink; /* doubly linked list of all locks */
459 struct file_lock *fl_prevlink; /* used to simplify lock removal */
460 struct file_lock *fl_nextblock; /* circular list of blocked processes */
461 struct file_lock *fl_prevblock;
462 fl_owner_t fl_owner;
463 unsigned int fl_pid;
464 wait_queue_head_t fl_wait;
465 struct file *fl_file;
466 unsigned char fl_flags;
467 unsigned char fl_type;
468 off_t fl_start;
469 off_t fl_end;
471 void (*fl_notify)(struct file_lock *); /* unblock callback */
473 union {
474 struct nfs_lock_info nfs_fl;
475 } fl_u;
478 extern struct file_lock *file_lock_table;
480 #include <linux/fcntl.h>
482 extern int fcntl_getlk(unsigned int, struct flock *);
483 extern int fcntl_setlk(unsigned int, unsigned int, struct flock *);
485 /* fs/locks.c */
486 extern void locks_remove_posix(struct file *, fl_owner_t);
487 extern void locks_remove_flock(struct file *);
488 extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
489 extern int posix_lock_file(struct file *, struct file_lock *, unsigned int);
490 extern void posix_block_lock(struct file_lock *, struct file_lock *);
491 extern void posix_unblock_lock(struct file_lock *);
493 struct fasync_struct {
494 int magic;
495 int fa_fd;
496 struct fasync_struct *fa_next; /* singly linked list */
497 struct file *fa_file;
500 #define FASYNC_MAGIC 0x4601
502 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
504 #include <linux/minix_fs_sb.h>
505 #include <linux/ext2_fs_sb.h>
506 #include <linux/hpfs_fs_sb.h>
507 #include <linux/ntfs_fs_sb.h>
508 #include <linux/msdos_fs_sb.h>
509 #include <linux/iso_fs_sb.h>
510 #include <linux/nfs_fs_sb.h>
511 #include <linux/sysv_fs_sb.h>
512 #include <linux/affs_fs_sb.h>
513 #include <linux/ufs_fs_sb.h>
514 #include <linux/efs_fs_sb.h>
515 #include <linux/romfs_fs_sb.h>
516 #include <linux/smb_fs_sb.h>
517 #include <linux/hfs_fs_sb.h>
518 #include <linux/adfs_fs_sb.h>
519 #include <linux/qnx4_fs_sb.h>
521 extern struct list_head super_blocks;
523 #define sb_entry(list) list_entry((list), struct super_block, s_list)
524 struct super_block {
525 struct list_head s_list; /* Keep this first */
526 kdev_t s_dev;
527 unsigned long s_blocksize;
528 unsigned char s_blocksize_bits;
529 unsigned char s_lock;
530 unsigned char s_rd_only;
531 unsigned char s_dirt;
532 struct file_system_type *s_type;
533 struct super_operations *s_op;
534 struct dquot_operations *dq_op;
535 unsigned long s_flags;
536 unsigned long s_magic;
537 unsigned long s_time;
538 struct dentry *s_root;
539 wait_queue_head_t s_wait;
541 struct inode *s_ibasket;
542 short int s_ibasket_count;
543 short int s_ibasket_max;
544 struct list_head s_dirty; /* dirty inodes */
546 union {
547 struct minix_sb_info minix_sb;
548 struct ext2_sb_info ext2_sb;
549 struct hpfs_sb_info hpfs_sb;
550 struct ntfs_sb_info ntfs_sb;
551 struct msdos_sb_info msdos_sb;
552 struct isofs_sb_info isofs_sb;
553 struct nfs_sb_info nfs_sb;
554 struct sysv_sb_info sysv_sb;
555 struct affs_sb_info affs_sb;
556 struct ufs_sb_info ufs_sb;
557 struct efs_sb_info efs_sb;
558 struct romfs_sb_info romfs_sb;
559 struct smb_sb_info smbfs_sb;
560 struct hfs_sb_info hfs_sb;
561 struct adfs_sb_info adfs_sb;
562 struct qnx4_sb_info qnx4_sb;
563 void *generic_sbp;
564 } u;
566 * The next field is for VFS *only*. No filesystems have any business
567 * even looking at it. You had been warned.
569 struct semaphore s_vfs_rename_sem; /* Kludge */
573 * VFS helper functions..
575 extern int vfs_rmdir(struct inode *, struct dentry *);
576 extern int vfs_unlink(struct inode *, struct dentry *);
577 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
580 * This is the "filldir" function type, used by readdir() to let
581 * the kernel specify what kind of dirent layout it wants to have.
582 * This allows the kernel to read directories into kernel space or
583 * to have different dirent layouts depending on the binary type.
585 typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t);
587 struct file_operations {
588 loff_t (*llseek) (struct file *, loff_t, int);
589 ssize_t (*read) (struct file *, char *, size_t, loff_t *);
590 ssize_t (*write) (struct file *, const char *, size_t, loff_t *);
591 int (*readdir) (struct file *, void *, filldir_t);
592 unsigned int (*poll) (struct file *, struct poll_table_struct *);
593 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
594 int (*mmap) (struct file *, struct vm_area_struct *);
595 int (*open) (struct inode *, struct file *);
596 int (*flush) (struct file *);
597 int (*release) (struct inode *, struct file *);
598 int (*fsync) (struct file *, struct dentry *);
599 int (*fasync) (int, struct file *, int);
600 int (*check_media_change) (kdev_t dev);
601 int (*revalidate) (kdev_t dev);
602 int (*lock) (struct file *, int, struct file_lock *);
605 struct inode_operations {
606 struct file_operations * default_file_ops;
607 int (*create) (struct inode *,struct dentry *,int);
608 struct dentry * (*lookup) (struct inode *,struct dentry *);
609 int (*link) (struct dentry *,struct inode *,struct dentry *);
610 int (*unlink) (struct inode *,struct dentry *);
611 int (*symlink) (struct inode *,struct dentry *,const char *);
612 int (*mkdir) (struct inode *,struct dentry *,int);
613 int (*rmdir) (struct inode *,struct dentry *);
614 int (*mknod) (struct inode *,struct dentry *,int,int);
615 int (*rename) (struct inode *, struct dentry *,
616 struct inode *, struct dentry *);
617 int (*readlink) (struct dentry *, char *,int);
618 struct dentry * (*follow_link) (struct dentry *, struct dentry *, unsigned int);
619 int (*readpage) (struct file *, struct page *);
620 int (*writepage) (struct file *, struct page *);
621 int (*bmap) (struct inode *,int);
622 void (*truncate) (struct inode *);
623 int (*permission) (struct inode *, int);
624 int (*smap) (struct inode *,int);
625 int (*updatepage) (struct file *, struct page *, unsigned long, unsigned int);
626 int (*revalidate) (struct dentry *);
629 struct super_operations {
630 void (*read_inode) (struct inode *);
631 void (*write_inode) (struct inode *);
632 void (*put_inode) (struct inode *);
633 void (*delete_inode) (struct inode *);
634 int (*notify_change) (struct dentry *, struct iattr *);
635 void (*put_super) (struct super_block *);
636 void (*write_super) (struct super_block *);
637 int (*statfs) (struct super_block *, struct statfs *, int);
638 int (*remount_fs) (struct super_block *, int *, char *);
639 void (*clear_inode) (struct inode *);
640 void (*umount_begin) (struct super_block *);
643 struct dquot_operations {
644 void (*initialize) (struct inode *, short);
645 void (*drop) (struct inode *);
646 int (*alloc_block) (const struct inode *, unsigned long, uid_t, char);
647 int (*alloc_inode) (const struct inode *, unsigned long, uid_t);
648 void (*free_block) (const struct inode *, unsigned long);
649 void (*free_inode) (const struct inode *, unsigned long);
650 int (*transfer) (struct inode *, struct iattr *, char, uid_t);
653 struct file_system_type {
654 const char *name;
655 int fs_flags;
656 struct super_block *(*read_super) (struct super_block *, void *, int);
657 struct file_system_type * next;
660 extern int register_filesystem(struct file_system_type *);
661 extern int unregister_filesystem(struct file_system_type *);
664 #define FLOCK_VERIFY_READ 1
665 #define FLOCK_VERIFY_WRITE 2
667 extern int locks_mandatory_locked(struct inode *);
668 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
670 extern inline int locks_verify_locked(struct inode *inode)
672 /* Candidates for mandatory locking have the setgid bit set
673 * but no group execute bit - an otherwise meaningless combination.
675 if (IS_MANDLOCK(inode) &&
676 (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
677 return (locks_mandatory_locked(inode));
678 return (0);
681 extern inline int locks_verify_area(int read_write, struct inode *inode,
682 struct file *filp, loff_t offset,
683 size_t count)
685 /* Candidates for mandatory locking have the setgid bit set
686 * but no group execute bit - an otherwise meaningless combination.
688 if (IS_MANDLOCK(inode) &&
689 (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
690 return (locks_mandatory_area(read_write, inode, filp, offset,
691 count));
692 return (0);
696 /* fs/open.c */
698 asmlinkage int sys_open(const char *, int, int);
699 asmlinkage int sys_close(unsigned int); /* yes, it's really unsigned */
700 extern int do_truncate(struct dentry *, unsigned long);
701 extern int get_unused_fd(void);
702 extern void put_unused_fd(unsigned int);
704 extern struct file *filp_open(const char *, int, int);
705 extern int filp_close(struct file *, fl_owner_t id);
707 extern char * getname(const char *);
708 #define __getname() ((char *) __get_free_page(GFP_KERNEL))
709 #define putname(name) free_page((unsigned long)(name))
711 extern void kill_fasync(struct fasync_struct *, int);
712 extern int register_blkdev(unsigned int, const char *, struct file_operations *);
713 extern int unregister_blkdev(unsigned int, const char *);
714 extern int blkdev_open(struct inode *, struct file *);
715 extern int blkdev_release (struct inode *);
716 extern struct file_operations def_blk_fops;
717 extern struct inode_operations blkdev_inode_operations;
719 /* fs/devices.c */
720 extern int register_chrdev(unsigned int, const char *, struct file_operations *);
721 extern int unregister_chrdev(unsigned int, const char *);
722 extern int chrdev_open(struct inode *, struct file *);
723 extern struct file_operations def_chr_fops;
724 extern struct inode_operations chrdev_inode_operations;
725 extern char * bdevname(kdev_t);
726 extern char * cdevname(kdev_t);
727 extern char * kdevname(kdev_t);
728 extern void init_special_inode(struct inode *, umode_t, int);
730 extern void init_fifo(struct inode *);
731 extern struct inode_operations fifo_inode_operations;
733 /* Invalid inode operations -- fs/bad_inode.c */
734 extern void make_bad_inode(struct inode *);
735 extern int is_bad_inode(struct inode *);
737 extern struct file_operations connecting_fifo_fops;
738 extern struct file_operations read_fifo_fops;
739 extern struct file_operations write_fifo_fops;
740 extern struct file_operations rdwr_fifo_fops;
741 extern struct file_operations read_pipe_fops;
742 extern struct file_operations write_pipe_fops;
743 extern struct file_operations rdwr_pipe_fops;
745 extern struct file_system_type *get_fs_type(const char *);
747 extern int fs_may_remount_ro(struct super_block *);
748 extern int fs_may_mount(kdev_t);
750 extern struct file *inuse_filps;
752 extern void refile_buffer(struct buffer_head *);
753 extern void set_writetime(struct buffer_head *, int);
754 extern int try_to_free_buffers(struct page *);
756 extern int nr_buffers;
757 extern int buffermem;
758 extern int nr_buffer_heads;
760 #define BUF_CLEAN 0
761 #define BUF_LOCKED 1 /* Buffers scheduled for write */
762 #define BUF_DIRTY 2 /* Dirty buffers, not yet scheduled for write */
763 #define NR_LIST 3
765 void mark_buffer_uptodate(struct buffer_head *, int);
767 extern inline void mark_buffer_clean(struct buffer_head * bh)
769 if (test_and_clear_bit(BH_Dirty, &bh->b_state)) {
770 if (bh->b_list == BUF_DIRTY)
771 refile_buffer(bh);
775 extern inline void mark_buffer_dirty(struct buffer_head * bh, int flag)
777 if (!test_and_set_bit(BH_Dirty, &bh->b_state)) {
778 set_writetime(bh, flag);
779 if (bh->b_list != BUF_DIRTY)
780 refile_buffer(bh);
784 extern int check_disk_change(kdev_t);
785 extern int invalidate_inodes(struct super_block *);
786 extern void invalidate_inode_pages(struct inode *);
787 extern void invalidate_buffers(kdev_t);
788 extern int floppy_is_wp(int);
789 extern void sync_inodes(kdev_t);
790 extern void write_inode_now(struct inode *);
791 extern void sync_dev(kdev_t);
792 extern int fsync_dev(kdev_t);
793 extern void sync_supers(kdev_t);
794 extern int bmap(struct inode *, int);
795 extern int notify_change(struct dentry *, struct iattr *);
796 extern int permission(struct inode *, int);
797 extern int get_write_access(struct inode *);
798 extern void put_write_access(struct inode *);
799 extern struct dentry * open_namei(const char *, int, int);
800 extern struct dentry * do_mknod(const char *, int, dev_t);
801 extern int do_pipe(int *);
803 /* fs/dcache.c -- generic fs support functions */
804 extern int is_subdir(struct dentry *, struct dentry *);
805 extern ino_t find_inode_number(struct dentry *, struct qstr *);
808 * Kernel pointers have redundant information, so we can use a
809 * scheme where we can return either an error code or a dentry
810 * pointer with the same return value.
812 * This should be a per-architecture thing, to allow different
813 * error and pointer decisions.
815 #define ERR_PTR(err) ((void *)((long)(err)))
816 #define PTR_ERR(ptr) ((long)(ptr))
817 #define IS_ERR(ptr) ((unsigned long)(ptr) > (unsigned long)(-1000))
820 * The bitmask for a lookup event:
821 * - follow links at the end
822 * - require a directory
823 * - ending slashes ok even for nonexistent files
824 * - internal "there are more path compnents" flag
826 #define LOOKUP_FOLLOW (1)
827 #define LOOKUP_DIRECTORY (2)
828 #define LOOKUP_SLASHOK (4)
829 #define LOOKUP_CONTINUE (8)
831 extern struct dentry * lookup_dentry(const char *, struct dentry *, unsigned int);
832 extern struct dentry * __namei(const char *, unsigned int);
834 #define namei(pathname) __namei(pathname, 1)
835 #define lnamei(pathname) __namei(pathname, 0)
837 extern void iput(struct inode *);
838 extern struct inode * igrab(struct inode *);
839 extern ino_t iunique(struct super_block *, ino_t);
840 extern struct inode * iget(struct super_block *, unsigned long);
841 extern void clear_inode(struct inode *);
842 extern struct inode * get_empty_inode(void);
844 extern void insert_inode_hash(struct inode *);
845 extern void remove_inode_hash(struct inode *);
846 extern struct file * get_empty_filp(void);
847 extern struct buffer_head * get_hash_table(kdev_t, int, int);
848 extern struct buffer_head * getblk(kdev_t, int, int);
849 extern struct buffer_head * find_buffer(kdev_t, int, int);
850 extern void ll_rw_block(int, int, struct buffer_head * bh[]);
851 extern int is_read_only(kdev_t);
852 extern void __brelse(struct buffer_head *);
853 extern inline void brelse(struct buffer_head *buf)
855 if (buf)
856 __brelse(buf);
858 extern void __bforget(struct buffer_head *);
859 extern inline void bforget(struct buffer_head *buf)
861 if (buf)
862 __bforget(buf);
864 extern void set_blocksize(kdev_t, int);
865 extern unsigned int get_hardblocksize(kdev_t);
866 extern struct buffer_head * bread(kdev_t, int, int);
867 extern struct buffer_head * breada(kdev_t, int, int, unsigned int, unsigned int);
869 extern int brw_page(int, struct page *, kdev_t, int [], int, int);
871 typedef long (*writepage_t)(struct file *, struct page *, unsigned long, unsigned long, const char *);
873 extern int generic_readpage(struct file *, struct page *);
874 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
875 extern ssize_t generic_file_read(struct file *, char *, size_t, loff_t *);
876 extern ssize_t generic_file_write(struct file *, const char *, size_t, loff_t *, writepage_t);
878 extern struct super_block *get_super(kdev_t);
879 extern void put_super(kdev_t);
880 unsigned long generate_cluster(kdev_t, int b[], int);
881 unsigned long generate_cluster_swab32(kdev_t, int b[], int);
882 extern kdev_t ROOT_DEV;
884 extern void show_buffers(void);
885 extern void mount_root(void);
887 #ifdef CONFIG_BLK_DEV_INITRD
888 extern kdev_t real_root_dev;
889 extern int change_root(kdev_t, const char *);
890 #endif
892 extern ssize_t char_read(struct file *, char *, size_t, loff_t *);
893 extern ssize_t block_read(struct file *, char *, size_t, loff_t *);
894 extern int read_ahead[];
896 extern ssize_t char_write(struct file *, const char *, size_t, loff_t *);
897 extern ssize_t block_write(struct file *, const char *, size_t, loff_t *);
899 extern int block_fsync(struct file *, struct dentry *);
900 extern int file_fsync(struct file *, struct dentry *);
902 extern int inode_change_ok(struct inode *, struct iattr *);
903 extern void inode_setattr(struct inode *, struct iattr *);
905 /* kludge to get SCSI modules working */
906 #include <linux/minix_fs.h>
907 #include <linux/minix_fs_sb.h>
909 #endif /* __KERNEL__ */
911 #endif /* _LINUX_FS_H */