5 * This file has definitions for some important file table
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: */
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 */
63 #define READA 2 /* read-ahead - don't block if no resources */
64 #define WRITEA 3 /* write-ahead - don't block if no resources */
67 #define NULL ((void *) 0)
70 #define NIL_FILP ((struct file *)0)
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 */
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. */
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 */
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
];
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
202 * The second 16 bytes we use for lru buffer scans, as used by
203 * sync_buffers() and refill_freelist(). -- sct
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 */
231 void (*b_end_io
)(struct buffer_head
*bh
, int uptodate
);
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
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
312 unsigned int ia_valid
;
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>
339 struct list_head i_hash
;
340 struct list_head i_list
;
341 struct list_head i_dentry
;
344 unsigned int i_count
;
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
;
376 unsigned int i_attr_flags
;
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
;
403 /* Inode state bits.. */
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
);
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 */
422 struct file
*f_next
, **f_pprev
;
423 struct dentry
*f_dentry
;
424 struct file_operations
*f_op
;
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
;
433 unsigned long f_version
;
435 /* needed for tty driver, and maybe others */
439 extern int init_private_file(struct file
*, struct dentry
*, int);
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
;
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
;
464 wait_queue_head_t fl_wait
;
465 struct file
*fl_file
;
466 unsigned char fl_flags
;
467 unsigned char fl_type
;
471 void (*fl_notify
)(struct file_lock
*); /* unblock callback */
474 struct nfs_lock_info nfs_fl
;
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
*);
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
{
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)
525 struct list_head s_list
; /* Keep this first */
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 */
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
;
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
{
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
));
681 extern inline int locks_verify_area(int read_write
, struct inode
*inode
,
682 struct file
*filp
, loff_t offset
,
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
,
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
;
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
;
761 #define BUF_LOCKED 1 /* Buffers scheduled for write */
762 #define BUF_DIRTY 2 /* Dirty buffers, not yet scheduled for write */
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
)
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
)
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
)
858 extern void __bforget(struct buffer_head
*);
859 extern inline void bforget(struct buffer_head
*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 *);
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 */