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|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME)
109 * Magic mount flag number. Has to be or-ed to the flag values.
111 #define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */
112 #define MS_MGC_MSK 0xffff0000 /* magic flag number mask */
115 * Note that read-only etc flags are inode-specific: setting some file-system
116 * flags just means all the inodes inherit those flags by default. It might be
117 * possible to override it selectively if you really wanted to with some
118 * ioctl() that is not currently implemented.
120 * Exception: MS_RDONLY is always applied to the entire file system.
122 * Unfortunately, it is possible to change a filesystems flags with it mounted
123 * with files in use. This means that all of the inodes will not have their
124 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
125 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
127 #define __IS_FLG(inode,flg) (((inode)->i_sb && (inode)->i_sb->s_flags & (flg)) \
128 || (inode)->i_flags & (flg))
130 #define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY))
131 #define IS_NOSUID(inode) __IS_FLG(inode, MS_NOSUID)
132 #define IS_NODEV(inode) __IS_FLG(inode, MS_NODEV)
133 #define IS_NOEXEC(inode) __IS_FLG(inode, MS_NOEXEC)
134 #define IS_SYNC(inode) __IS_FLG(inode, MS_SYNCHRONOUS)
135 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
137 #define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA)
138 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
139 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
140 #define IS_NOATIME(inode) __IS_FLG(inode, MS_NOATIME)
141 #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
143 /* the read-only stuff doesn't really belong here, but any other place is
144 probably as bad and I don't want to create yet another include file. */
146 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
147 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
148 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
149 #define BLKGETSIZE _IO(0x12,96) /* return device size */
150 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
151 #define BLKRASET _IO(0x12,98) /* Set read ahead for block device */
152 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
153 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
154 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
155 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
156 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
157 #define BLKSSZGET _IO(0x12,104)/* get block device sector size (reserved for) */
159 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
160 #define FIBMAP _IO(0x00,1) /* bmap access */
161 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
165 #include <asm/semaphore.h>
166 #include <asm/byteorder.h>
167 #include <asm/bitops.h>
169 extern void update_atime (struct inode
*inode
);
170 #define UPDATE_ATIME(inode) update_atime (inode)
172 extern void buffer_init(unsigned long);
173 extern void inode_init(void);
174 extern void file_table_init(void);
175 extern void dcache_init(void);
177 typedef char buffer_block
[BLOCK_SIZE
];
180 #define BH_Uptodate 0 /* 1 if the buffer contains valid data */
181 #define BH_Dirty 1 /* 1 if the buffer is dirty */
182 #define BH_Lock 2 /* 1 if the buffer is locked */
183 #define BH_Req 3 /* 0 if the buffer has been invalidated */
184 #define BH_Protected 6 /* 1 if the buffer is protected */
187 * Try to keep the most commonly used fields in single cache lines (16
188 * bytes) to improve performance. This ordering should be
189 * particularly beneficial on 32-bit processors.
191 * We use the first 16 bytes for the data which is used in searches
192 * over the block hash lists (ie. getblk(), find_buffer() and
195 * The second 16 bytes we use for lru buffer scans, as used by
196 * sync_buffers() and refill_freelist(). -- sct
199 /* First cache line: */
200 struct buffer_head
* b_next
; /* Hash queue list */
201 unsigned long b_blocknr
; /* block number */
202 unsigned long b_size
; /* block size */
203 kdev_t b_dev
; /* device (B_FREE = free) */
204 kdev_t b_rdev
; /* Real device */
205 unsigned long b_rsector
; /* Real buffer location on disk */
206 struct buffer_head
* b_this_page
; /* circular list of buffers in one page */
207 unsigned long b_state
; /* buffer state bitmap (see above) */
208 struct buffer_head
* b_next_free
;
209 unsigned int b_count
; /* users using this block */
211 /* Non-performance-critical data follows. */
212 char * b_data
; /* pointer to data block (1024 bytes) */
213 unsigned int b_list
; /* List that this buffer appears */
214 unsigned long b_flushtime
; /* Time when this (dirty) buffer
215 * should be written */
216 wait_queue_head_t b_wait
;
217 struct buffer_head
** b_pprev
; /* doubly linked list of hash-queue */
218 struct buffer_head
* b_prev_free
; /* doubly linked list of buffers */
219 struct buffer_head
* b_reqnext
; /* request queue */
224 void (*b_end_io
)(struct buffer_head
*bh
, int uptodate
);
228 typedef void (bh_end_io_t
)(struct buffer_head
*bh
, int uptodate
);
229 void init_buffer(struct buffer_head
*bh
, kdev_t dev
, int block
,
230 bh_end_io_t
*handler
, void *dev_id
);
232 static inline int buffer_uptodate(struct buffer_head
* bh
)
234 return test_bit(BH_Uptodate
, &bh
->b_state
);
237 static inline int buffer_dirty(struct buffer_head
* bh
)
239 return test_bit(BH_Dirty
, &bh
->b_state
);
242 static inline int buffer_locked(struct buffer_head
* bh
)
244 return test_bit(BH_Lock
, &bh
->b_state
);
247 static inline int buffer_req(struct buffer_head
* bh
)
249 return test_bit(BH_Req
, &bh
->b_state
);
252 static inline int buffer_protected(struct buffer_head
* bh
)
254 return test_bit(BH_Protected
, &bh
->b_state
);
257 #define buffer_page(bh) (mem_map + MAP_NR((bh)->b_data))
258 #define touch_buffer(bh) set_bit(PG_referenced, &buffer_page(bh)->flags)
260 #include <linux/pipe_fs_i.h>
261 #include <linux/minix_fs_i.h>
262 #include <linux/ext2_fs_i.h>
263 #include <linux/hpfs_fs_i.h>
264 #include <linux/ntfs_fs_i.h>
265 #include <linux/msdos_fs_i.h>
266 #include <linux/umsdos_fs_i.h>
267 #include <linux/iso_fs_i.h>
268 #include <linux/nfs_fs_i.h>
269 #include <linux/sysv_fs_i.h>
270 #include <linux/affs_fs_i.h>
271 #include <linux/ufs_fs_i.h>
272 #include <linux/coda_fs_i.h>
273 #include <linux/romfs_fs_i.h>
274 #include <linux/smb_fs_i.h>
275 #include <linux/hfs_fs_i.h>
276 #include <linux/adfs_fs_i.h>
277 #include <linux/qnx4_fs_i.h>
280 * Attribute flags. These should be or-ed together to figure out what
287 #define ATTR_ATIME 16
288 #define ATTR_MTIME 32
289 #define ATTR_CTIME 64
290 #define ATTR_ATIME_SET 128
291 #define ATTR_MTIME_SET 256
292 #define ATTR_FORCE 512 /* Not a change, but a change it */
293 #define ATTR_ATTR_FLAG 1024
296 * This is the Inode Attributes structure, used for notify_change(). It
297 * uses the above definitions as flags, to know which values have changed.
298 * Also, in this manner, a Filesystem can look at only the values it cares
299 * about. Basically, these are the attributes that the VFS layer can
300 * request to change from the FS layer.
302 * Derek Atkins <warlord@MIT.EDU> 94-10-20
305 unsigned int ia_valid
;
313 unsigned int ia_attr_flags
;
317 * This is the inode attributes flag definitions
319 #define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */
320 #define ATTR_FLAG_NOATIME 2 /* Don't update atime */
321 #define ATTR_FLAG_APPEND 4 /* Append-only file */
322 #define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */
323 #define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */
326 * Includes for diskquotas and mount structures.
328 #include <linux/quota.h>
329 #include <linux/mount.h>
332 struct list_head i_hash
;
333 struct list_head i_list
;
334 struct list_head i_dentry
;
337 unsigned int i_count
;
348 unsigned long i_blksize
;
349 unsigned long i_blocks
;
350 unsigned long i_version
;
351 unsigned long i_nrpages
;
352 struct semaphore i_sem
;
353 struct semaphore i_atomic_write
;
354 struct inode_operations
*i_op
;
355 struct super_block
*i_sb
;
356 wait_queue_head_t i_wait
;
357 struct file_lock
*i_flock
;
358 struct vm_area_struct
*i_mmap
;
359 struct page
*i_pages
;
360 struct dquot
*i_dquot
[MAXQUOTAS
];
362 unsigned long i_state
;
364 unsigned int i_flags
;
365 unsigned char i_pipe
;
366 unsigned char i_sock
;
369 unsigned int i_attr_flags
;
372 struct pipe_inode_info pipe_i
;
373 struct minix_inode_info minix_i
;
374 struct ext2_inode_info ext2_i
;
375 struct hpfs_inode_info hpfs_i
;
376 struct ntfs_inode_info ntfs_i
;
377 struct msdos_inode_info msdos_i
;
378 struct umsdos_inode_info umsdos_i
;
379 struct iso_inode_info isofs_i
;
380 struct nfs_inode_info nfs_i
;
381 struct sysv_inode_info sysv_i
;
382 struct affs_inode_info affs_i
;
383 struct ufs_inode_info ufs_i
;
384 struct romfs_inode_info romfs_i
;
385 struct coda_inode_info coda_i
;
386 struct smb_inode_info smbfs_i
;
387 struct hfs_inode_info hfs_i
;
388 struct adfs_inode_info adfs_i
;
389 struct qnx4_inode_info qnx4_i
;
390 struct socket socket_i
;
395 /* Inode state bits.. */
400 extern void __mark_inode_dirty(struct inode
*);
401 static inline void mark_inode_dirty(struct inode
*inode
)
403 if (!(inode
->i_state
& I_DIRTY
))
404 __mark_inode_dirty(inode
);
408 int pid
; /* pid or -pgrp where SIGIO should be sent */
409 uid_t uid
, euid
; /* uid/euid of process setting the owner */
410 int signum
; /* posix.1b rt signal to be delivered on IO */
414 struct file
*f_next
, **f_pprev
;
415 struct dentry
*f_dentry
;
416 struct file_operations
*f_op
;
419 unsigned int f_count
, f_flags
;
420 unsigned long f_reada
, f_ramax
, f_raend
, f_ralen
, f_rawin
;
421 struct fown_struct f_owner
;
422 unsigned int f_uid
, f_gid
;
425 unsigned long f_version
;
427 /* needed for tty driver, and maybe others */
431 extern int init_private_file(struct file
*, struct dentry
*, int);
435 #define FL_BROKEN 4 /* broken flock() emulation */
436 #define FL_ACCESS 8 /* for processes suspended by mandatory locking */
437 #define FL_LOCKD 16 /* lock held by rpc.lockd */
440 * The POSIX file lock owner is determined by
441 * the "struct files_struct" in the thread group
442 * (or NULL for no owner - BSD locks).
444 * Lockd stuffs a "host" pointer into this.
446 typedef struct files_struct
*fl_owner_t
;
449 struct file_lock
*fl_next
; /* singly linked list for this inode */
450 struct file_lock
*fl_nextlink
; /* doubly linked list of all locks */
451 struct file_lock
*fl_prevlink
; /* used to simplify lock removal */
452 struct file_lock
*fl_nextblock
; /* circular list of blocked processes */
453 struct file_lock
*fl_prevblock
;
456 wait_queue_head_t fl_wait
;
457 struct file
*fl_file
;
458 unsigned char fl_flags
;
459 unsigned char fl_type
;
463 void (*fl_notify
)(struct file_lock
*); /* unblock callback */
466 struct nfs_lock_info nfs_fl
;
470 extern struct file_lock
*file_lock_table
;
472 #include <linux/fcntl.h>
474 extern int fcntl_getlk(unsigned int fd
, struct flock
*l
);
475 extern int fcntl_setlk(unsigned int fd
, unsigned int cmd
, struct flock
*l
);
478 extern void locks_remove_posix(struct file
*, fl_owner_t id
);
479 extern void locks_remove_flock(struct file
*);
480 extern struct file_lock
*posix_test_lock(struct file
*, struct file_lock
*);
481 extern int posix_lock_file(struct file
*, struct file_lock
*, unsigned int);
482 extern void posix_block_lock(struct file_lock
*, struct file_lock
*);
483 extern void posix_unblock_lock(struct file_lock
*);
485 #include <linux/stat.h>
487 struct fasync_struct
{
490 struct fasync_struct
*fa_next
; /* singly linked list */
491 struct file
*fa_file
;
494 #define FASYNC_MAGIC 0x4601
496 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
498 #include <linux/minix_fs_sb.h>
499 #include <linux/ext2_fs_sb.h>
500 #include <linux/hpfs_fs_sb.h>
501 #include <linux/ntfs_fs_sb.h>
502 #include <linux/msdos_fs_sb.h>
503 #include <linux/iso_fs_sb.h>
504 #include <linux/nfs_fs_sb.h>
505 #include <linux/sysv_fs_sb.h>
506 #include <linux/affs_fs_sb.h>
507 #include <linux/ufs_fs_sb.h>
508 #include <linux/romfs_fs_sb.h>
509 #include <linux/smb_fs_sb.h>
510 #include <linux/hfs_fs_sb.h>
511 #include <linux/adfs_fs_sb.h>
512 #include <linux/qnx4_fs_sb.h>
514 extern struct list_head super_blocks
;
516 #define sb_entry(list) list_entry((list), struct super_block, s_list)
518 struct list_head s_list
; /* Keep this first */
520 unsigned long s_blocksize
;
521 unsigned char s_blocksize_bits
;
522 unsigned char s_lock
;
523 unsigned char s_rd_only
;
524 unsigned char s_dirt
;
525 struct file_system_type
*s_type
;
526 struct super_operations
*s_op
;
527 struct dquot_operations
*dq_op
;
528 unsigned long s_flags
;
529 unsigned long s_magic
;
530 unsigned long s_time
;
531 struct dentry
*s_root
;
532 wait_queue_head_t s_wait
;
534 struct inode
*s_ibasket
;
535 short int s_ibasket_count
;
536 short int s_ibasket_max
;
537 struct list_head s_dirty
; /* dirty inodes */
540 struct minix_sb_info minix_sb
;
541 struct ext2_sb_info ext2_sb
;
542 struct hpfs_sb_info hpfs_sb
;
543 struct ntfs_sb_info ntfs_sb
;
544 struct msdos_sb_info msdos_sb
;
545 struct isofs_sb_info isofs_sb
;
546 struct nfs_sb_info nfs_sb
;
547 struct sysv_sb_info sysv_sb
;
548 struct affs_sb_info affs_sb
;
549 struct ufs_sb_info ufs_sb
;
550 struct romfs_sb_info romfs_sb
;
551 struct smb_sb_info smbfs_sb
;
552 struct hfs_sb_info hfs_sb
;
553 struct adfs_sb_info adfs_sb
;
554 struct qnx4_sb_info qnx4_sb
;
558 * The next field is for VFS *only*. No filesystems have any business
559 * even looking at it. You had been warned.
561 struct semaphore s_vfs_rename_sem
; /* Kludge */
565 * VFS helper functions..
567 extern int vfs_rmdir(struct inode
*, struct dentry
*);
568 extern int vfs_unlink(struct inode
*, struct dentry
*);
569 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
572 * This is the "filldir" function type, used by readdir() to let
573 * the kernel specify what kind of dirent layout it wants to have.
574 * This allows the kernel to read directories into kernel space or
575 * to have different dirent layouts depending on the binary type.
577 typedef int (*filldir_t
)(void *, const char *, int, off_t
, ino_t
);
579 struct file_operations
{
580 loff_t (*llseek
) (struct file
*, loff_t
, int);
581 ssize_t (*read
) (struct file
*, char *, size_t, loff_t
*);
582 ssize_t (*write
) (struct file
*, const char *, size_t, loff_t
*);
583 int (*readdir
) (struct file
*, void *, filldir_t
);
584 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
585 int (*ioctl
) (struct inode
*, struct file
*, unsigned int, unsigned long);
586 int (*mmap
) (struct file
*, struct vm_area_struct
*);
587 int (*open
) (struct inode
*, struct file
*);
588 int (*flush
) (struct file
*);
589 int (*release
) (struct inode
*, struct file
*);
590 int (*fsync
) (struct file
*, struct dentry
*);
591 int (*fasync
) (int, struct file
*, int);
592 int (*check_media_change
) (kdev_t dev
);
593 int (*revalidate
) (kdev_t dev
);
594 int (*lock
) (struct file
*, int, struct file_lock
*);
597 struct inode_operations
{
598 struct file_operations
* default_file_ops
;
599 int (*create
) (struct inode
*,struct dentry
*,int);
600 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*);
601 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
602 int (*unlink
) (struct inode
*,struct dentry
*);
603 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
604 int (*mkdir
) (struct inode
*,struct dentry
*,int);
605 int (*rmdir
) (struct inode
*,struct dentry
*);
606 int (*mknod
) (struct inode
*,struct dentry
*,int,int);
607 int (*rename
) (struct inode
*, struct dentry
*,
608 struct inode
*, struct dentry
*);
609 int (*readlink
) (struct dentry
*, char *,int);
610 struct dentry
* (*follow_link
) (struct dentry
*, struct dentry
*, unsigned int);
611 int (*readpage
) (struct file
*, struct page
*);
612 int (*writepage
) (struct file
*, struct page
*);
613 int (*bmap
) (struct inode
*,int);
614 void (*truncate
) (struct inode
*);
615 int (*permission
) (struct inode
*, int);
616 int (*smap
) (struct inode
*,int);
617 int (*updatepage
) (struct file
*, struct page
*, unsigned long, unsigned int, int);
618 int (*revalidate
) (struct dentry
*);
621 struct super_operations
{
622 void (*read_inode
) (struct inode
*);
623 void (*write_inode
) (struct inode
*);
624 void (*put_inode
) (struct inode
*);
625 void (*delete_inode
) (struct inode
*);
626 int (*notify_change
) (struct dentry
*, struct iattr
*);
627 void (*put_super
) (struct super_block
*);
628 void (*write_super
) (struct super_block
*);
629 int (*statfs
) (struct super_block
*, struct statfs
*, int);
630 int (*remount_fs
) (struct super_block
*, int *, char *);
631 void (*clear_inode
) (struct inode
*);
632 void (*umount_begin
) (struct super_block
*);
635 struct dquot_operations
{
636 void (*initialize
) (struct inode
*, short);
637 void (*drop
) (struct inode
*);
638 int (*alloc_block
) (const struct inode
*, unsigned long, uid_t
, char);
639 int (*alloc_inode
) (const struct inode
*, unsigned long, uid_t
);
640 void (*free_block
) (const struct inode
*, unsigned long);
641 void (*free_inode
) (const struct inode
*, unsigned long);
642 int (*transfer
) (struct inode
*, struct iattr
*, char, uid_t
);
645 struct file_system_type
{
648 struct super_block
*(*read_super
) (struct super_block
*, void *, int);
649 struct file_system_type
* next
;
652 extern int register_filesystem(struct file_system_type
*);
653 extern int unregister_filesystem(struct file_system_type
*);
656 #define FLOCK_VERIFY_READ 1
657 #define FLOCK_VERIFY_WRITE 2
659 extern int locks_mandatory_locked(struct inode
*inode
);
660 extern int locks_mandatory_area(int read_write
, struct inode
*inode
,
661 struct file
*filp
, loff_t offset
,
664 extern inline int locks_verify_locked(struct inode
*inode
)
666 /* Candidates for mandatory locking have the setgid bit set
667 * but no group execute bit - an otherwise meaningless combination.
669 if (IS_MANDLOCK(inode
) &&
670 (inode
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
)
671 return (locks_mandatory_locked(inode
));
675 extern inline int locks_verify_area(int read_write
, struct inode
*inode
,
676 struct file
*filp
, loff_t offset
,
679 /* Candidates for mandatory locking have the setgid bit set
680 * but no group execute bit - an otherwise meaningless combination.
682 if (IS_MANDLOCK(inode
) &&
683 (inode
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
)
684 return (locks_mandatory_area(read_write
, inode
, filp
, offset
,
692 asmlinkage
int sys_open(const char *, int, int);
693 asmlinkage
int sys_close(unsigned int); /* yes, it's really unsigned */
694 extern int do_truncate(struct dentry
*, unsigned long);
695 extern int get_unused_fd(void);
696 extern void put_unused_fd(unsigned int);
698 extern struct file
*filp_open(const char *, int, int);
699 extern int filp_close(struct file
*, fl_owner_t id
);
701 extern char * getname(const char * filename
);
702 #define __getname() ((char *) __get_free_page(GFP_KERNEL))
703 #define putname(name) free_page((unsigned long)(name))
705 extern void kill_fasync(struct fasync_struct
*fa
, int sig
);
706 extern int register_blkdev(unsigned int, const char *, struct file_operations
*);
707 extern int unregister_blkdev(unsigned int major
, const char * name
);
708 extern int blkdev_open(struct inode
* inode
, struct file
* filp
);
709 extern int blkdev_release (struct inode
* inode
);
710 extern struct file_operations def_blk_fops
;
711 extern struct inode_operations blkdev_inode_operations
;
714 extern int register_chrdev(unsigned int, const char *, struct file_operations
*);
715 extern int unregister_chrdev(unsigned int major
, const char * name
);
716 extern int chrdev_open(struct inode
* inode
, struct file
* filp
);
717 extern struct file_operations def_chr_fops
;
718 extern struct inode_operations chrdev_inode_operations
;
719 extern char * bdevname(kdev_t dev
);
720 extern char * cdevname(kdev_t dev
);
721 extern char * kdevname(kdev_t dev
);
722 extern void init_special_inode(struct inode
*, umode_t
, int);
725 extern void init_fifo(struct inode
* inode
);
726 extern struct inode_operations fifo_inode_operations
;
728 /* Invalid inode operations -- fs/bad_inode.c */
729 extern void make_bad_inode(struct inode
* inode
);
730 extern int is_bad_inode(struct inode
* inode
);
732 extern struct file_operations connecting_fifo_fops
;
733 extern struct file_operations read_fifo_fops
;
734 extern struct file_operations write_fifo_fops
;
735 extern struct file_operations rdwr_fifo_fops
;
736 extern struct file_operations read_pipe_fops
;
737 extern struct file_operations write_pipe_fops
;
738 extern struct file_operations rdwr_pipe_fops
;
740 extern struct file_system_type
*get_fs_type(const char *name
);
742 extern int fs_may_remount_ro(struct super_block
*);
743 extern int fs_may_mount(kdev_t dev
);
745 extern struct file
*inuse_filps
;
747 extern void refile_buffer(struct buffer_head
* buf
);
748 extern void set_writetime(struct buffer_head
* buf
, int flag
);
749 extern int try_to_free_buffers(struct page
*);
751 extern int nr_buffers
;
752 extern int buffermem
;
753 extern int nr_buffer_heads
;
756 #define BUF_LOCKED 1 /* Buffers scheduled for write */
757 #define BUF_DIRTY 2 /* Dirty buffers, not yet scheduled for write */
760 void mark_buffer_uptodate(struct buffer_head
* bh
, int on
);
762 extern inline void mark_buffer_clean(struct buffer_head
* bh
)
764 if (test_and_clear_bit(BH_Dirty
, &bh
->b_state
)) {
765 if (bh
->b_list
== BUF_DIRTY
)
770 extern inline void mark_buffer_dirty(struct buffer_head
* bh
, int flag
)
772 if (!test_and_set_bit(BH_Dirty
, &bh
->b_state
)) {
773 set_writetime(bh
, flag
);
774 if (bh
->b_list
!= BUF_DIRTY
)
779 extern int check_disk_change(kdev_t dev
);
780 extern int invalidate_inodes(struct super_block
* sb
);
781 extern void invalidate_inode_pages(struct inode
*);
782 extern void invalidate_buffers(kdev_t dev
);
783 extern int floppy_is_wp(int minor
);
784 extern void sync_inodes(kdev_t dev
);
785 extern void write_inode_now(struct inode
*inode
);
786 extern void sync_dev(kdev_t dev
);
787 extern int fsync_dev(kdev_t dev
);
788 extern void sync_supers(kdev_t dev
);
789 extern int bmap(struct inode
* inode
,int block
);
790 extern int notify_change(struct dentry
*, struct iattr
*);
791 extern int permission(struct inode
* inode
,int mask
);
792 extern int get_write_access(struct inode
*inode
);
793 extern void put_write_access(struct inode
*inode
);
794 extern struct dentry
* open_namei(const char * pathname
, int flag
, int mode
);
795 extern struct dentry
* do_mknod(const char * filename
, int mode
, dev_t dev
);
796 extern int do_pipe(int *);
798 /* fs/dcache.c -- generic fs support functions */
799 extern int is_subdir(struct dentry
*, struct dentry
*);
800 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
803 * Kernel pointers have redundant information, so we can use a
804 * scheme where we can return either an error code or a dentry
805 * pointer with the same return value.
807 * This should be a per-architecture thing, to allow different
808 * error and pointer decisions.
810 #define ERR_PTR(err) ((void *)((long)(err)))
811 #define PTR_ERR(ptr) ((long)(ptr))
812 #define IS_ERR(ptr) ((unsigned long)(ptr) > (unsigned long)(-1000))
815 * The bitmask for a lookup event:
816 * - follow links at the end
817 * - require a directory
818 * - ending slashes ok even for nonexistent files
819 * - internal "there are more path compnents" flag
821 #define LOOKUP_FOLLOW (1)
822 #define LOOKUP_DIRECTORY (2)
823 #define LOOKUP_SLASHOK (4)
824 #define LOOKUP_CONTINUE (8)
826 extern struct dentry
* lookup_dentry(const char *, struct dentry
*, unsigned int);
827 extern struct dentry
* __namei(const char *, unsigned int);
829 #define namei(pathname) __namei(pathname, 1)
830 #define lnamei(pathname) __namei(pathname, 0)
832 extern void iput(struct inode
*);
833 extern struct inode
* iget(struct super_block
*, unsigned long);
834 extern void clear_inode(struct inode
*);
835 extern struct inode
* get_empty_inode(void);
837 extern void insert_inode_hash(struct inode
*);
838 extern void remove_inode_hash(struct inode
*);
839 extern struct file
* get_empty_filp(void);
840 extern struct buffer_head
* get_hash_table(kdev_t
, int, int);
841 extern struct buffer_head
* getblk(kdev_t
, int, int);
842 extern struct buffer_head
* find_buffer(kdev_t dev
, int block
, int size
);
843 extern void ll_rw_block(int, int, struct buffer_head
* bh
[]);
844 extern int is_read_only(kdev_t
);
845 extern void __brelse(struct buffer_head
*);
846 extern inline void brelse(struct buffer_head
*buf
)
851 extern void __bforget(struct buffer_head
*buf
);
852 extern inline void bforget(struct buffer_head
*buf
)
857 extern void set_blocksize(kdev_t dev
, int size
);
858 extern unsigned int get_hardblocksize(kdev_t dev
);
859 extern struct buffer_head
* bread(kdev_t dev
, int block
, int size
);
860 extern struct buffer_head
* breada(kdev_t dev
,int block
, int size
,
861 unsigned int pos
, unsigned int filesize
);
863 extern int brw_page(int, struct page
*, kdev_t
, int [], int, int);
865 extern int generic_readpage(struct file
*, struct page
*);
866 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
867 extern ssize_t
generic_file_read(struct file
*, char *, size_t, loff_t
*);
868 extern ssize_t
generic_file_write(struct file
*, const char*, size_t, loff_t
*);
870 extern struct super_block
*get_super(kdev_t dev
);
871 extern void put_super(kdev_t dev
);
872 unsigned long generate_cluster(kdev_t dev
, int b
[], int size
);
873 unsigned long generate_cluster_swab32(kdev_t dev
, int b
[], int size
);
874 extern kdev_t ROOT_DEV
;
876 extern void show_buffers(void);
877 extern void mount_root(void);
879 #ifdef CONFIG_BLK_DEV_INITRD
880 extern kdev_t real_root_dev
;
881 extern int change_root(kdev_t new_root_dev
,const char *put_old
);
884 extern ssize_t
char_read(struct file
*, char *, size_t, loff_t
*);
885 extern ssize_t
block_read(struct file
*, char *, size_t, loff_t
*);
886 extern int read_ahead
[];
888 extern ssize_t
char_write(struct file
*, const char *, size_t, loff_t
*);
889 extern ssize_t
block_write(struct file
*, const char *, size_t, loff_t
*);
891 extern int block_fsync(struct file
*, struct dentry
*dir
);
892 extern int file_fsync(struct file
*, struct dentry
*dir
);
894 extern int inode_change_ok(struct inode
*, struct iattr
*);
895 extern void inode_setattr(struct inode
*, struct iattr
*);
897 /* kludge to get SCSI modules working */
898 #include <linux/minix_fs.h>
899 #include <linux/minix_fs_sb.h>
901 #endif /* __KERNEL__ */