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>
21 #include <linux/cache.h>
22 #include <linux/stddef.h>
23 #include <linux/string.h>
25 #include <asm/atomic.h>
26 #include <asm/bitops.h>
28 struct poll_table_struct
;
32 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
33 * the file limit at runtime and only root can increase the per-process
34 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
35 * upper limit on files-per-process.
37 * Some programs (notably those using select()) may have to be
38 * recompiled to take full advantage of the new limits..
41 /* Fixed constants first: */
43 #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
44 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
46 #define BLOCK_SIZE_BITS 10
47 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
49 /* And dynamically-tunable limits and defaults: */
50 struct files_stat_struct
{
51 int nr_files
; /* read only */
52 int nr_free_files
; /* read only */
53 int max_files
; /* tunable */
55 extern struct files_stat_struct files_stat
;
56 extern int max_super_blocks
, nr_super_blocks
;
58 #define NR_FILE 8192 /* this can well be larger on a larger system */
59 #define NR_RESERVED_FILES 10 /* reserved for root */
71 #define READA 2 /* read-ahead - don't block if no resources */
72 #define SPECIAL 4 /* For non-blockdevice requests in request queue */
78 /* public flags for file_system_type */
79 #define FS_REQUIRES_DEV 1
80 #define FS_NO_DCACHE 2 /* Only dcache the necessary things. */
81 #define FS_NO_PRELIM 4 /* prevent preloading of dentries, even if
82 * FS_NO_DCACHE is not set.
84 #define FS_SINGLE 8 /*
85 * Filesystem that can have only one superblock;
86 * kernel-wide vfsmnt is placed in ->kern_mnt by
87 * kern_mount() which must be called _after_
88 * register_filesystem().
90 #define FS_NOMOUNT 16 /* Never mount from userland */
91 #define FS_LITTER 32 /* Keeps the tree in dcache */
92 #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
93 * as nfs_rename() will be cleaned up
96 * These are the fs-independent mount-flags: up to 16 flags are supported
98 #define MS_RDONLY 1 /* Mount read-only */
99 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
100 #define MS_NODEV 4 /* Disallow access to device special files */
101 #define MS_NOEXEC 8 /* Disallow program execution */
102 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
103 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
104 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
105 #define MS_NOATIME 1024 /* Do not update access times. */
106 #define MS_NODIRATIME 2048 /* Do not update directory access times */
109 * Flags that can be altered by MS_REMOUNT
111 #define MS_RMT_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|\
112 MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME)
115 * Magic mount flag number. Has to be or-ed to the flag values.
117 #define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */
118 #define MS_MGC_MSK 0xffff0000 /* magic flag number mask */
120 /* Inode flags - they have nothing to superblock flags now */
122 #define S_SYNC 1 /* Writes are synced at once */
123 #define S_NOATIME 2 /* Do not update access times */
124 #define S_QUOTA 4 /* Quota initialized for file */
125 #define S_APPEND 8 /* Append-only file */
126 #define S_IMMUTABLE 16 /* Immutable file */
127 #define S_DEAD 32 /* removed, but still open directory */
130 * Note that nosuid etc flags are inode-specific: setting some file-system
131 * flags just means all the inodes inherit those flags by default. It might be
132 * possible to override it selectively if you really wanted to with some
133 * ioctl() that is not currently implemented.
135 * Exception: MS_RDONLY is always applied to the entire file system.
137 * Unfortunately, it is possible to change a filesystems flags with it mounted
138 * with files in use. This means that all of the inodes will not have their
139 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
140 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
142 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
144 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
145 #define IS_NOSUID(inode) __IS_FLG(inode, MS_NOSUID)
146 #define IS_NODEV(inode) __IS_FLG(inode, MS_NODEV)
147 #define IS_NOEXEC(inode) __IS_FLG(inode, MS_NOEXEC)
148 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || ((inode)->i_flags & S_SYNC))
149 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
151 #define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA)
152 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
153 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
154 #define IS_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
155 #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
157 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
159 /* the read-only stuff doesn't really belong here, but any other place is
160 probably as bad and I don't want to create yet another include file. */
162 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
163 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
164 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
165 #define BLKGETSIZE _IO(0x12,96) /* return device size */
166 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
167 #define BLKRASET _IO(0x12,98) /* Set read ahead for block device */
168 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
169 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
170 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
171 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
172 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
173 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
175 #define BLKPG _IO(0x12,105)/* See blkpg.h */
176 #define BLKELVGET _IOR(0x12,106,sizeof(blkelv_ioctl_arg_t))/* elevator get */
177 #define BLKELVSET _IOW(0x12,107,sizeof(blkelv_ioctl_arg_t))/* elevator set */
178 /* This was here just to show that the number is taken -
179 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
183 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
184 #define FIBMAP _IO(0x00,1) /* bmap access */
185 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
189 #include <asm/semaphore.h>
190 #include <asm/byteorder.h>
192 extern void update_atime (struct inode
*);
193 #define UPDATE_ATIME(inode) update_atime (inode)
195 extern void buffer_init(unsigned long);
196 extern void inode_init(unsigned long);
199 #define BH_Uptodate 0 /* 1 if the buffer contains valid data */
200 #define BH_Dirty 1 /* 1 if the buffer is dirty */
201 #define BH_Lock 2 /* 1 if the buffer is locked */
202 #define BH_Req 3 /* 0 if the buffer has been invalidated */
203 #define BH_Mapped 4 /* 1 if the buffer has a disk mapping */
204 #define BH_New 5 /* 1 if the buffer is new and not yet written out */
205 #define BH_Protected 6 /* 1 if the buffer is protected */
208 * Try to keep the most commonly used fields in single cache lines (16
209 * bytes) to improve performance. This ordering should be
210 * particularly beneficial on 32-bit processors.
212 * We use the first 16 bytes for the data which is used in searches
213 * over the block hash lists (ie. getblk() and friends).
215 * The second 16 bytes we use for lru buffer scans, as used by
216 * sync_buffers() and refill_freelist(). -- sct
219 /* First cache line: */
220 struct buffer_head
*b_next
; /* Hash queue list */
221 unsigned long b_blocknr
; /* block number */
222 unsigned short b_size
; /* block size */
223 unsigned short b_list
; /* List that this buffer appears */
224 kdev_t b_dev
; /* device (B_FREE = free) */
226 atomic_t b_count
; /* users using this block */
227 kdev_t b_rdev
; /* Real device */
228 unsigned long b_state
; /* buffer state bitmap (see above) */
229 unsigned long b_flushtime
; /* Time when (dirty) buffer should be written */
231 struct buffer_head
*b_next_free
;/* lru/free list linkage */
232 struct buffer_head
*b_prev_free
;/* doubly linked list of buffers */
233 struct buffer_head
*b_this_page
;/* circular list of buffers in one page */
234 struct buffer_head
*b_reqnext
; /* request queue */
236 struct buffer_head
**b_pprev
; /* doubly linked list of hash-queue */
237 char * b_data
; /* pointer to data block (512 byte) */
238 struct page
*b_page
; /* the page this bh is mapped to */
239 void (*b_end_io
)(struct buffer_head
*bh
, int uptodate
); /* I/O completion */
240 void *b_private
; /* reserved for b_end_io */
242 unsigned long b_rsector
; /* Real buffer location on disk */
243 wait_queue_head_t b_wait
;
246 typedef void (bh_end_io_t
)(struct buffer_head
*bh
, int uptodate
);
247 void init_buffer(struct buffer_head
*, bh_end_io_t
*, void *);
249 #define __buffer_state(bh, state) (((bh)->b_state & (1UL << BH_##state)) != 0)
251 #define buffer_uptodate(bh) __buffer_state(bh,Uptodate)
252 #define buffer_dirty(bh) __buffer_state(bh,Dirty)
253 #define buffer_locked(bh) __buffer_state(bh,Lock)
254 #define buffer_req(bh) __buffer_state(bh,Req)
255 #define buffer_mapped(bh) __buffer_state(bh,Mapped)
256 #define buffer_new(bh) __buffer_state(bh,New)
257 #define buffer_protected(bh) __buffer_state(bh,Protected)
259 #define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK)
261 extern void set_bh_page(struct buffer_head
*bh
, struct page
*page
, unsigned long offset
);
263 #define touch_buffer(bh) SetPageReferenced(bh->b_page)
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>
285 #include <linux/bfs_fs_i.h>
286 #include <linux/udf_fs_i.h>
287 #include <linux/ncp_fs_i.h>
288 #include <linux/proc_fs_i.h>
289 #include <linux/usbdev_fs_i.h>
292 * Attribute flags. These should be or-ed together to figure out what
299 #define ATTR_ATIME 16
300 #define ATTR_MTIME 32
301 #define ATTR_CTIME 64
302 #define ATTR_ATIME_SET 128
303 #define ATTR_MTIME_SET 256
304 #define ATTR_FORCE 512 /* Not a change, but a change it */
305 #define ATTR_ATTR_FLAG 1024
308 * This is the Inode Attributes structure, used for notify_change(). It
309 * uses the above definitions as flags, to know which values have changed.
310 * Also, in this manner, a Filesystem can look at only the values it cares
311 * about. Basically, these are the attributes that the VFS layer can
312 * request to change from the FS layer.
314 * Derek Atkins <warlord@MIT.EDU> 94-10-20
317 unsigned int ia_valid
;
325 unsigned int ia_attr_flags
;
329 * This is the inode attributes flag definitions
331 #define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */
332 #define ATTR_FLAG_NOATIME 2 /* Don't update atime */
333 #define ATTR_FLAG_APPEND 4 /* Append-only file */
334 #define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */
335 #define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */
338 * Includes for diskquotas and mount structures.
340 #include <linux/quota.h>
341 #include <linux/mount.h>
344 * oh the beauties of C type declarations.
347 struct address_space
;
349 struct address_space_operations
{
350 int (*writepage
)(struct file
*, struct page
*);
351 int (*readpage
)(struct file
*, struct page
*);
352 int (*sync_page
)(struct page
*);
353 int (*prepare_write
)(struct file
*, struct page
*, unsigned, unsigned);
354 int (*commit_write
)(struct file
*, struct page
*, unsigned, unsigned);
355 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
356 int (*bmap
)(struct address_space
*, long);
359 struct address_space
{
360 struct list_head pages
; /* list of pages */
361 unsigned long nrpages
; /* number of pages */
362 struct address_space_operations
*a_ops
; /* methods */
363 void *host
; /* owner: inode, block_device */
364 struct vm_area_struct
*i_mmap
; /* list of private mappings */
365 struct vm_area_struct
*i_mmap_shared
; /* list of shared mappings */
366 spinlock_t i_shared_lock
; /* and spinlock protecting it */
369 struct block_device
{
370 struct list_head bd_hash
;
372 /* struct address_space bd_data; */
373 dev_t bd_dev
; /* not a kdev_t - it's a search key */
375 const struct block_device_operations
*bd_op
;
376 struct semaphore bd_sem
; /* open/close mutex */
380 struct list_head i_hash
;
381 struct list_head i_list
;
382 struct list_head i_dentry
;
396 unsigned long i_blksize
;
397 unsigned long i_blocks
;
398 unsigned long i_version
;
399 struct semaphore i_sem
;
400 struct semaphore i_zombie
;
401 struct inode_operations
*i_op
;
402 struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
403 struct super_block
*i_sb
;
404 wait_queue_head_t i_wait
;
405 struct file_lock
*i_flock
;
406 struct address_space
*i_mapping
;
407 struct address_space i_data
;
408 struct dquot
*i_dquot
[MAXQUOTAS
];
409 struct pipe_inode_info
*i_pipe
;
410 struct block_device
*i_bdev
;
412 unsigned long i_state
;
414 unsigned int i_flags
;
415 unsigned char i_sock
;
417 atomic_t i_writecount
;
418 unsigned int i_attr_flags
;
421 struct minix_inode_info minix_i
;
422 struct ext2_inode_info ext2_i
;
423 struct hpfs_inode_info hpfs_i
;
424 struct ntfs_inode_info ntfs_i
;
425 struct msdos_inode_info msdos_i
;
426 struct umsdos_inode_info umsdos_i
;
427 struct iso_inode_info isofs_i
;
428 struct nfs_inode_info nfs_i
;
429 struct sysv_inode_info sysv_i
;
430 struct affs_inode_info affs_i
;
431 struct ufs_inode_info ufs_i
;
432 struct efs_inode_info efs_i
;
433 struct romfs_inode_info romfs_i
;
434 struct coda_inode_info coda_i
;
435 struct smb_inode_info smbfs_i
;
436 struct hfs_inode_info hfs_i
;
437 struct adfs_inode_info adfs_i
;
438 struct qnx4_inode_info qnx4_i
;
439 struct bfs_inode_info bfs_i
;
440 struct udf_inode_info udf_i
;
441 struct ncp_inode_info ncpfs_i
;
442 struct proc_inode_info proc_i
;
443 struct socket socket_i
;
444 struct usbdev_inode_info usbdev_i
;
449 /* Inode state bits.. */
455 extern void __mark_inode_dirty(struct inode
*);
456 static inline void mark_inode_dirty(struct inode
*inode
)
458 if (!(inode
->i_state
& I_DIRTY
))
459 __mark_inode_dirty(inode
);
463 int pid
; /* pid or -pgrp where SIGIO should be sent */
464 uid_t uid
, euid
; /* uid/euid of process setting the owner */
465 int signum
; /* posix.1b rt signal to be delivered on IO */
469 struct list_head f_list
;
470 struct dentry
*f_dentry
;
471 struct vfsmount
*f_vfsmnt
;
472 struct file_operations
*f_op
;
474 unsigned int f_flags
;
477 unsigned long f_reada
, f_ramax
, f_raend
, f_ralen
, f_rawin
;
478 struct fown_struct f_owner
;
479 unsigned int f_uid
, f_gid
;
482 unsigned long f_version
;
484 /* needed for tty driver, and maybe others */
487 extern spinlock_t files_lock
;
488 #define file_list_lock() spin_lock(&files_lock);
489 #define file_list_unlock() spin_unlock(&files_lock);
491 #define get_file(x) atomic_inc(&(x)->f_count)
492 #define file_count(x) atomic_read(&(x)->f_count)
494 extern int init_private_file(struct file
*, struct dentry
*, int);
498 #define FL_BROKEN 4 /* broken flock() emulation */
499 #define FL_ACCESS 8 /* for processes suspended by mandatory locking */
500 #define FL_LOCKD 16 /* lock held by rpc.lockd */
503 * The POSIX file lock owner is determined by
504 * the "struct files_struct" in the thread group
505 * (or NULL for no owner - BSD locks).
507 * Lockd stuffs a "host" pointer into this.
509 typedef struct files_struct
*fl_owner_t
;
512 struct file_lock
*fl_next
; /* singly linked list for this inode */
513 struct list_head fl_link
; /* doubly linked list of all locks */
514 struct list_head fl_block
; /* circular list of blocked processes */
517 wait_queue_head_t fl_wait
;
518 struct file
*fl_file
;
519 unsigned char fl_flags
;
520 unsigned char fl_type
;
524 void (*fl_notify
)(struct file_lock
*); /* unblock callback */
525 void (*fl_insert
)(struct file_lock
*); /* lock insertion callback */
526 void (*fl_remove
)(struct file_lock
*); /* lock removal callback */
529 struct nfs_lock_info nfs_fl
;
533 /* The following constant reflects the upper bound of the file/locking space */
535 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
536 #define OFFSET_MAX INT_LIMIT(loff_t)
537 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
540 extern struct list_head file_lock_list
;
542 #include <linux/fcntl.h>
544 extern int fcntl_getlk(unsigned int, struct flock
*);
545 extern int fcntl_setlk(unsigned int, unsigned int, struct flock
*);
547 extern int fcntl_getlk64(unsigned int, struct flock64
*);
548 extern int fcntl_setlk64(unsigned int, unsigned int, struct flock64
*);
551 extern void locks_remove_posix(struct file
*, fl_owner_t
);
552 extern void locks_remove_flock(struct file
*);
553 extern struct file_lock
*posix_test_lock(struct file
*, struct file_lock
*);
554 extern int posix_lock_file(struct file
*, struct file_lock
*, unsigned int);
555 extern void posix_block_lock(struct file_lock
*, struct file_lock
*);
556 extern void posix_unblock_lock(struct file_lock
*);
558 struct fasync_struct
{
561 struct fasync_struct
*fa_next
; /* singly linked list */
562 struct file
*fa_file
;
565 #define FASYNC_MAGIC 0x4601
567 /* SMP safe fasync helpers: */
568 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
569 /* can be called from interrupts */
570 extern void kill_fasync(struct fasync_struct
**, int, int);
571 /* only for net: no internal synchronization */
572 extern void __kill_fasync(struct fasync_struct
*, int, int);
575 struct dentry
*dentry
;
576 struct vfsmount
*mnt
;
582 #define DQUOT_USR_ENABLED 0x01 /* User diskquotas enabled */
583 #define DQUOT_GRP_ENABLED 0x02 /* Group diskquotas enabled */
585 struct quota_mount_options
587 unsigned int flags
; /* Flags for diskquotas on this device */
588 struct semaphore dqio_sem
; /* lock device while I/O in progress */
589 struct semaphore dqoff_sem
; /* serialize quota_off() and quota_on() on device */
590 struct file
*files
[MAXQUOTAS
]; /* fp's to quotafiles */
591 time_t inode_expire
[MAXQUOTAS
]; /* expiretime for inode-quota */
592 time_t block_expire
[MAXQUOTAS
]; /* expiretime for block-quota */
593 char rsquash
[MAXQUOTAS
]; /* for quotas threat root as any other user */
600 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
602 #include <linux/minix_fs_sb.h>
603 #include <linux/ext2_fs_sb.h>
604 #include <linux/hpfs_fs_sb.h>
605 #include <linux/ntfs_fs_sb.h>
606 #include <linux/msdos_fs_sb.h>
607 #include <linux/iso_fs_sb.h>
608 #include <linux/nfs_fs_sb.h>
609 #include <linux/sysv_fs_sb.h>
610 #include <linux/affs_fs_sb.h>
611 #include <linux/ufs_fs_sb.h>
612 #include <linux/efs_fs_sb.h>
613 #include <linux/romfs_fs_sb.h>
614 #include <linux/smb_fs_sb.h>
615 #include <linux/hfs_fs_sb.h>
616 #include <linux/adfs_fs_sb.h>
617 #include <linux/qnx4_fs_sb.h>
618 #include <linux/bfs_fs_sb.h>
619 #include <linux/udf_fs_sb.h>
620 #include <linux/ncp_fs_sb.h>
621 #include <linux/usbdev_fs_sb.h>
623 extern struct list_head super_blocks
;
625 #define sb_entry(list) list_entry((list), struct super_block, s_list)
627 struct list_head s_list
; /* Keep this first */
629 unsigned long s_blocksize
;
630 unsigned char s_blocksize_bits
;
631 unsigned char s_lock
;
632 unsigned char s_dirt
;
633 struct file_system_type
*s_type
;
634 struct super_operations
*s_op
;
635 struct dquot_operations
*dq_op
;
636 unsigned long s_flags
;
637 unsigned long s_magic
;
638 struct dentry
*s_root
;
639 wait_queue_head_t s_wait
;
641 struct list_head s_dirty
; /* dirty inodes */
642 struct list_head s_files
;
644 struct block_device
*s_bdev
;
645 struct list_head s_mounts
; /* vfsmount(s) of this one */
646 struct quota_mount_options s_dquot
; /* Diskquota specific options */
649 struct minix_sb_info minix_sb
;
650 struct ext2_sb_info ext2_sb
;
651 struct hpfs_sb_info hpfs_sb
;
652 struct ntfs_sb_info ntfs_sb
;
653 struct msdos_sb_info msdos_sb
;
654 struct isofs_sb_info isofs_sb
;
655 struct nfs_sb_info nfs_sb
;
656 struct sysv_sb_info sysv_sb
;
657 struct affs_sb_info affs_sb
;
658 struct ufs_sb_info ufs_sb
;
659 struct efs_sb_info efs_sb
;
660 struct romfs_sb_info romfs_sb
;
661 struct smb_sb_info smbfs_sb
;
662 struct hfs_sb_info hfs_sb
;
663 struct adfs_sb_info adfs_sb
;
664 struct qnx4_sb_info qnx4_sb
;
665 struct bfs_sb_info bfs_sb
;
666 struct udf_sb_info udf_sb
;
667 struct ncp_sb_info ncpfs_sb
;
668 struct usbdev_sb_info usbdevfs_sb
;
672 * The next field is for VFS *only*. No filesystems have any business
673 * even looking at it. You had been warned.
675 struct semaphore s_vfs_rename_sem
; /* Kludge */
677 /* The next field is used by knfsd when converting a (inode number based)
678 * file handle into a dentry. As it builds a path in the dcache tree from
679 * the bottom up, there may for a time be a subpath of dentrys which is not
680 * connected to the main tree. This semaphore ensure that there is only ever
681 * one such free path per filesystem. Note that unconnected files (or other
682 * non-directories) are allowed, but not unconnected diretories.
684 struct semaphore s_nfsd_free_path_sem
;
688 * VFS helper functions..
690 extern int vfs_create(struct inode
*, struct dentry
*, int);
691 extern int vfs_mkdir(struct inode
*, struct dentry
*, int);
692 extern int vfs_mknod(struct inode
*, struct dentry
*, int, dev_t
);
693 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
694 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
695 extern int vfs_rmdir(struct inode
*, struct dentry
*);
696 extern int vfs_unlink(struct inode
*, struct dentry
*);
697 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
713 * This is the "filldir" function type, used by readdir() to let
714 * the kernel specify what kind of dirent layout it wants to have.
715 * This allows the kernel to read directories into kernel space or
716 * to have different dirent layouts depending on the binary type.
718 typedef int (*filldir_t
)(void *, const char *, int, off_t
, ino_t
, unsigned);
720 struct block_device_operations
{
721 int (*open
) (struct inode
*, struct file
*);
722 int (*release
) (struct inode
*, struct file
*);
723 int (*ioctl
) (struct inode
*, struct file
*, unsigned, unsigned long);
724 int (*check_media_change
) (kdev_t
);
725 int (*revalidate
) (kdev_t
);
730 * read, write, poll, fsync, readv, writev can be called
731 * without the big kernel lock held in all filesystems.
733 struct file_operations
{
734 struct module
*owner
;
735 loff_t (*llseek
) (struct file
*, loff_t
, int);
736 ssize_t (*read
) (struct file
*, char *, size_t, loff_t
*);
737 ssize_t (*write
) (struct file
*, const char *, size_t, loff_t
*);
738 int (*readdir
) (struct file
*, void *, filldir_t
);
739 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
740 int (*ioctl
) (struct inode
*, struct file
*, unsigned int, unsigned long);
741 int (*mmap
) (struct file
*, struct vm_area_struct
*);
742 int (*open
) (struct inode
*, struct file
*);
743 int (*flush
) (struct file
*);
744 int (*release
) (struct inode
*, struct file
*);
745 int (*fsync
) (struct file
*, struct dentry
*, int datasync
);
746 int (*fasync
) (int, struct file
*, int);
747 int (*lock
) (struct file
*, int, struct file_lock
*);
748 ssize_t (*readv
) (struct file
*, const struct iovec
*, unsigned long, loff_t
*);
749 ssize_t (*writev
) (struct file
*, const struct iovec
*, unsigned long, loff_t
*);
752 struct inode_operations
{
753 int (*create
) (struct inode
*,struct dentry
*,int);
754 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*);
755 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
756 int (*unlink
) (struct inode
*,struct dentry
*);
757 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
758 int (*mkdir
) (struct inode
*,struct dentry
*,int);
759 int (*rmdir
) (struct inode
*,struct dentry
*);
760 int (*mknod
) (struct inode
*,struct dentry
*,int,int);
761 int (*rename
) (struct inode
*, struct dentry
*,
762 struct inode
*, struct dentry
*);
763 int (*readlink
) (struct dentry
*, char *,int);
764 int (*follow_link
) (struct dentry
*, struct nameidata
*);
765 void (*truncate
) (struct inode
*);
766 int (*permission
) (struct inode
*, int);
767 int (*revalidate
) (struct dentry
*);
768 int (*setattr
) (struct dentry
*, struct iattr
*);
769 int (*getattr
) (struct dentry
*, struct iattr
*);
773 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
774 * without the big kernel lock held in all filesystems.
776 struct super_operations
{
777 void (*read_inode
) (struct inode
*);
778 void (*write_inode
) (struct inode
*, int);
779 void (*put_inode
) (struct inode
*);
780 void (*delete_inode
) (struct inode
*);
781 void (*put_super
) (struct super_block
*);
782 void (*write_super
) (struct super_block
*);
783 int (*statfs
) (struct super_block
*, struct statfs
*);
784 int (*remount_fs
) (struct super_block
*, int *, char *);
785 void (*clear_inode
) (struct inode
*);
786 void (*umount_begin
) (struct super_block
*);
789 struct dquot_operations
{
790 void (*initialize
) (struct inode
*, short);
791 void (*drop
) (struct inode
*);
792 int (*alloc_block
) (const struct inode
*, unsigned long, char);
793 int (*alloc_inode
) (const struct inode
*, unsigned long);
794 void (*free_block
) (const struct inode
*, unsigned long);
795 void (*free_inode
) (const struct inode
*, unsigned long);
796 int (*transfer
) (struct dentry
*, struct iattr
*);
799 struct file_system_type
{
802 struct super_block
*(*read_super
) (struct super_block
*, void *, int);
803 struct module
*owner
;
804 struct vfsmount
*kern_mnt
; /* For kernel mount, if it's FS_SINGLE fs */
805 struct file_system_type
* next
;
808 #define DECLARE_FSTYPE(var,type,read,flags) \
809 struct file_system_type var = { \
813 owner: THIS_MODULE, \
816 #define DECLARE_FSTYPE_DEV(var,type,read) \
817 DECLARE_FSTYPE(var,type,read,FS_REQUIRES_DEV)
819 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
820 #define fops_get(fops) \
821 (((fops) && (fops)->owner) \
822 ? ( try_inc_mod_count((fops)->owner) ? (fops) : NULL ) \
825 #define fops_put(fops) \
827 if ((fops) && (fops)->owner) \
828 __MOD_DEC_USE_COUNT((fops)->owner); \
831 extern int register_filesystem(struct file_system_type
*);
832 extern int unregister_filesystem(struct file_system_type
*);
833 extern struct vfsmount
*kern_mount(struct file_system_type
*);
834 extern void kern_umount(struct vfsmount
*);
835 extern int may_umount(struct vfsmount
*);
836 extern long do_mount(char *, char *, char *, unsigned long, void *);
839 extern int vfs_statfs(struct super_block
*, struct statfs
*);
841 /* Return value for VFS lock functions - tells locks.c to lock conventionally
842 * REALLY kosha for root NFS and nfs_lock
844 #define LOCK_USE_CLNT 1
846 #define FLOCK_VERIFY_READ 1
847 #define FLOCK_VERIFY_WRITE 2
849 extern int locks_mandatory_locked(struct inode
*);
850 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
853 * Candidates for mandatory locking have the setgid bit set
854 * but no group execute bit - an otherwise meaningless combination.
856 #define MANDATORY_LOCK(inode) \
857 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
859 static inline int locks_verify_locked(struct inode
*inode
)
861 if (MANDATORY_LOCK(inode
))
862 return locks_mandatory_locked(inode
);
866 static inline int locks_verify_area(int read_write
, struct inode
*inode
,
867 struct file
*filp
, loff_t offset
,
870 if (inode
->i_flock
&& MANDATORY_LOCK(inode
))
871 return locks_mandatory_area(read_write
, inode
, filp
, offset
, count
);
875 static inline int locks_verify_truncate(struct inode
*inode
,
879 if (inode
->i_flock
&& MANDATORY_LOCK(inode
))
880 return locks_mandatory_area(
881 FLOCK_VERIFY_WRITE
, inode
, filp
,
882 size
< inode
->i_size
? size
: inode
->i_size
,
883 (size
< inode
->i_size
? inode
->i_size
- size
884 : size
- inode
->i_size
)
892 asmlinkage
long sys_open(const char *, int, int);
893 asmlinkage
long sys_close(unsigned int); /* yes, it's really unsigned */
894 extern int do_truncate(struct dentry
*, loff_t start
);
896 extern struct file
*filp_open(const char *, int, int);
897 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int);
898 extern int filp_close(struct file
*, fl_owner_t id
);
899 extern char * getname(const char *);
902 extern void vfs_caches_init(unsigned long);
904 #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
905 #define putname(name) kmem_cache_free(names_cachep, (void *)(name))
907 enum {BDEV_FILE
, BDEV_SWAP
, BDEV_FS
, BDEV_RAW
};
908 extern int register_blkdev(unsigned int, const char *, struct block_device_operations
*);
909 extern int unregister_blkdev(unsigned int, const char *);
910 extern struct block_device
*bdget(dev_t
);
911 extern void bdput(struct block_device
*);
912 extern int blkdev_open(struct inode
*, struct file
*);
913 extern struct file_operations def_blk_fops
;
914 extern struct file_operations def_fifo_fops
;
915 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
916 extern int blkdev_get(struct block_device
*, mode_t
, unsigned, int);
917 extern int blkdev_put(struct block_device
*, int);
920 extern const struct block_device_operations
*get_blkfops(unsigned int);
921 extern int register_chrdev(unsigned int, const char *, struct file_operations
*);
922 extern int unregister_chrdev(unsigned int, const char *);
923 extern int chrdev_open(struct inode
*, struct file
*);
924 extern const char * bdevname(kdev_t
);
925 extern const char * cdevname(kdev_t
);
926 extern const char * kdevname(kdev_t
);
927 extern void init_special_inode(struct inode
*, umode_t
, int);
929 /* Invalid inode operations -- fs/bad_inode.c */
930 extern void make_bad_inode(struct inode
*);
931 extern int is_bad_inode(struct inode
*);
933 extern struct file_operations read_fifo_fops
;
934 extern struct file_operations write_fifo_fops
;
935 extern struct file_operations rdwr_fifo_fops
;
936 extern struct file_operations read_pipe_fops
;
937 extern struct file_operations write_pipe_fops
;
938 extern struct file_operations rdwr_pipe_fops
;
940 extern int fs_may_remount_ro(struct super_block
*);
942 extern int try_to_free_buffers(struct page
*, int);
943 extern void refile_buffer(struct buffer_head
* buf
);
946 #define BUF_LOCKED 1 /* Buffers scheduled for write */
947 #define BUF_DIRTY 2 /* Dirty buffers, not yet scheduled for write */
948 #define BUF_PROTECTED 3 /* Ramdisk persistent storage */
952 * This is called by bh->b_end_io() handlers when I/O has completed.
954 static inline void mark_buffer_uptodate(struct buffer_head
* bh
, int on
)
957 set_bit(BH_Uptodate
, &bh
->b_state
);
959 clear_bit(BH_Uptodate
, &bh
->b_state
);
962 #define atomic_set_buffer_clean(bh) test_and_clear_bit(BH_Dirty, &(bh)->b_state)
964 static inline void __mark_buffer_clean(struct buffer_head
*bh
)
969 static inline void mark_buffer_clean(struct buffer_head
* bh
)
971 if (atomic_set_buffer_clean(bh
))
972 __mark_buffer_clean(bh
);
975 #define atomic_set_buffer_protected(bh) test_and_set_bit(BH_Protected, &(bh)->b_state)
977 static inline void __mark_buffer_protected(struct buffer_head
*bh
)
982 static inline void mark_buffer_protected(struct buffer_head
* bh
)
984 if (!atomic_set_buffer_protected(bh
))
985 __mark_buffer_protected(bh
);
988 extern void FASTCALL(__mark_buffer_dirty(struct buffer_head
*bh
, int flag
));
989 extern void FASTCALL(mark_buffer_dirty(struct buffer_head
*bh
, int flag
));
991 #define atomic_set_buffer_dirty(bh) test_and_set_bit(BH_Dirty, &(bh)->b_state)
994 * If an error happens during the make_request, this function
995 * has to be recalled. It marks the buffer as clean and not
996 * uptodate, and it notifys the upper layer about the end
999 static inline void buffer_IO_error(struct buffer_head
* bh
)
1001 mark_buffer_clean(bh
);
1003 * b_end_io has to clear the BH_Uptodate bitflag in the error case!
1005 bh
->b_end_io(bh
, 0);
1008 extern void balance_dirty(kdev_t
);
1009 extern int check_disk_change(kdev_t
);
1010 extern int invalidate_inodes(struct super_block
*);
1011 extern void invalidate_inode_pages(struct inode
*);
1012 #define invalidate_buffers(dev) __invalidate_buffers((dev), 0)
1013 #define destroy_buffers(dev) __invalidate_buffers((dev), 1)
1014 extern void __invalidate_buffers(kdev_t dev
, int);
1015 extern void sync_inodes(kdev_t
);
1016 extern void write_inode_now(struct inode
*, int);
1017 extern void sync_dev(kdev_t
);
1018 extern int fsync_dev(kdev_t
);
1019 extern void sync_supers(kdev_t
);
1020 extern int bmap(struct inode
*, int);
1021 extern int notify_change(struct dentry
*, struct iattr
*);
1022 extern int permission(struct inode
*, int);
1023 extern int get_write_access(struct inode
*);
1024 extern int deny_write_access(struct file
*);
1025 static inline void put_write_access(struct inode
* inode
)
1027 atomic_dec(&inode
->i_writecount
);
1029 static inline void allow_write_access(struct file
*file
)
1032 atomic_inc(&file
->f_dentry
->d_inode
->i_writecount
);
1034 extern int do_pipe(int *);
1036 extern int open_namei(const char *, int, int, struct nameidata
*);
1038 extern int kernel_read(struct file
*, unsigned long, char *, unsigned long);
1039 extern struct file
* open_exec(const char *);
1041 /* fs/dcache.c -- generic fs support functions */
1042 extern int is_subdir(struct dentry
*, struct dentry
*);
1043 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
1046 * Kernel pointers have redundant information, so we can use a
1047 * scheme where we can return either an error code or a dentry
1048 * pointer with the same return value.
1050 * This should be a per-architecture thing, to allow different
1051 * error and pointer decisions.
1053 #define ERR_PTR(err) ((void *)((long)(err)))
1054 #define PTR_ERR(ptr) ((long)(ptr))
1055 #define IS_ERR(ptr) ((unsigned long)(ptr) > (unsigned long)(-1000))
1058 * The bitmask for a lookup event:
1059 * - follow links at the end
1060 * - require a directory
1061 * - ending slashes ok even for nonexistent files
1062 * - internal "there are more path compnents" flag
1064 #define LOOKUP_FOLLOW (1)
1065 #define LOOKUP_DIRECTORY (2)
1066 #define LOOKUP_CONTINUE (4)
1067 #define LOOKUP_POSITIVE (8)
1068 #define LOOKUP_PARENT (16)
1069 #define LOOKUP_NOALT (32)
1071 * Type of the last component on LOOKUP_PARENT
1073 enum {LAST_NORM
, LAST_ROOT
, LAST_DOT
, LAST_DOTDOT
, LAST_BIND
};
1076 * "descriptor" for what we're up to with a read for sendfile().
1077 * This allows us to use the same read code yet
1078 * have multiple different users of the data that
1079 * we read from a file.
1081 * The simplest case just copies the data to user
1089 } read_descriptor_t
;
1091 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*, unsigned long, unsigned long);
1093 /* needed for stackable file system support */
1094 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
1096 extern int __user_walk(const char *, unsigned, struct nameidata
*);
1097 extern int path_init(const char *, unsigned, struct nameidata
*);
1098 extern int path_walk(const char *, struct nameidata
*);
1099 extern void path_release(struct nameidata
*);
1100 extern int follow_down(struct vfsmount
**, struct dentry
**);
1101 extern int follow_up(struct vfsmount
**, struct dentry
**);
1102 extern struct dentry
* lookup_one(const char *, struct dentry
*);
1103 extern struct dentry
* lookup_hash(struct qstr
*, struct dentry
*);
1104 #define user_path_walk(name,nd) __user_walk(name, LOOKUP_FOLLOW|LOOKUP_POSITIVE, nd)
1105 #define user_path_walk_link(name,nd) __user_walk(name, LOOKUP_POSITIVE, nd)
1107 extern void iput(struct inode
*);
1108 extern void force_delete(struct inode
*);
1109 extern struct inode
* igrab(struct inode
*);
1110 extern ino_t
iunique(struct super_block
*, ino_t
);
1112 typedef int (*find_inode_t
)(struct inode
*, unsigned long, void *);
1113 extern struct inode
* iget4(struct super_block
*, unsigned long, find_inode_t
, void *);
1114 static inline struct inode
*iget(struct super_block
*sb
, unsigned long ino
)
1116 return iget4(sb
, ino
, NULL
, NULL
);
1119 extern void clear_inode(struct inode
*);
1120 extern struct inode
* get_empty_inode(void);
1122 extern void insert_inode_hash(struct inode
*);
1123 extern void remove_inode_hash(struct inode
*);
1124 extern struct file
* get_empty_filp(void);
1125 extern void file_move(struct file
*f
, struct list_head
*list
);
1126 extern void file_moveto(struct file
*new, struct file
*old
);
1127 extern struct buffer_head
* get_hash_table(kdev_t
, int, int);
1128 extern struct buffer_head
* getblk(kdev_t
, int, int);
1129 extern void ll_rw_block(int, int, struct buffer_head
* bh
[]);
1130 extern int is_read_only(kdev_t
);
1131 extern void __brelse(struct buffer_head
*);
1132 static inline void brelse(struct buffer_head
*buf
)
1137 extern void __bforget(struct buffer_head
*);
1138 static inline void bforget(struct buffer_head
*buf
)
1143 extern void set_blocksize(kdev_t
, int);
1144 extern unsigned int get_hardblocksize(kdev_t
);
1145 extern struct buffer_head
* bread(kdev_t
, int, int);
1146 extern struct buffer_head
* breada(kdev_t
, int, int, unsigned int, unsigned int);
1147 extern void wakeup_bdflush(int wait
);
1149 extern int brw_page(int, struct page
*, kdev_t
, int [], int);
1151 typedef int (get_block_t
)(struct inode
*,long,struct buffer_head
*,int);
1153 /* Generic buffer handling for block filesystems.. */
1154 extern int block_flushpage(struct page
*, unsigned long);
1155 extern int block_symlink(struct inode
*, const char *, int);
1156 extern int block_write_full_page(struct page
*, get_block_t
*);
1157 extern int block_read_full_page(struct page
*, get_block_t
*);
1158 extern int block_prepare_write(struct page
*, unsigned, unsigned, get_block_t
*);
1159 extern int cont_prepare_write(struct page
*, unsigned, unsigned, get_block_t
*,
1161 extern int block_sync_page(struct page
*);
1163 int generic_block_bmap(struct address_space
*, long, get_block_t
*);
1164 int generic_commit_write(struct file
*, struct page
*, unsigned, unsigned);
1165 int block_zero_page(struct address_space
*mapping
, loff_t
, unsigned);
1167 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
1168 extern ssize_t
generic_file_read(struct file
*, char *, size_t, loff_t
*);
1169 extern ssize_t
generic_file_write(struct file
*, const char *, size_t, loff_t
*);
1170 extern void do_generic_file_read(struct file
*, loff_t
*, read_descriptor_t
*, read_actor_t
);
1172 extern ssize_t
generic_read_dir(struct file
*, char *, size_t, loff_t
*);
1174 extern struct file_operations generic_ro_fops
;
1176 extern int vfs_readlink(struct dentry
*, char *, int, const char *);
1177 extern int vfs_follow_link(struct nameidata
*, const char *);
1178 extern int page_readlink(struct dentry
*, char *, int);
1179 extern int page_follow_link(struct dentry
*, struct nameidata
*);
1180 extern struct inode_operations page_symlink_inode_operations
;
1182 extern int vfs_readdir(struct file
*, filldir_t
, void *);
1183 extern int dcache_readdir(struct file
*, void *, filldir_t
);
1185 extern struct file_system_type
*get_fs_type(const char *name
);
1186 extern struct super_block
*get_super(kdev_t
);
1187 struct super_block
*get_empty_super(void);
1188 extern void put_super(kdev_t
);
1189 unsigned long generate_cluster(kdev_t
, int b
[], int);
1190 unsigned long generate_cluster_swab32(kdev_t
, int b
[], int);
1191 extern kdev_t ROOT_DEV
;
1192 extern char root_device_name
[];
1195 extern void show_buffers(void);
1196 extern void mount_root(void);
1198 #ifdef CONFIG_BLK_DEV_INITRD
1199 extern kdev_t real_root_dev
;
1200 extern int change_root(kdev_t
, const char *);
1203 extern ssize_t
char_read(struct file
*, char *, size_t, loff_t
*);
1204 extern ssize_t
block_read(struct file
*, char *, size_t, loff_t
*);
1205 extern int read_ahead
[];
1207 extern ssize_t
char_write(struct file
*, const char *, size_t, loff_t
*);
1208 extern ssize_t
block_write(struct file
*, const char *, size_t, loff_t
*);
1210 extern int file_fsync(struct file
*, struct dentry
*, int);
1211 extern int generic_buffer_fdatasync(struct inode
*inode
, unsigned long start_idx
, unsigned long end_idx
);
1213 extern int inode_change_ok(struct inode
*, struct iattr
*);
1214 extern void inode_setattr(struct inode
*, struct iattr
*);
1217 * Common dentry functions for inclusion in the VFS
1218 * or in other stackable file systems. Some of these
1219 * functions were in linux/fs/ C (VFS) files.
1224 * Locking the parent is needed to:
1225 * - serialize directory operations
1226 * - make sure the parent doesn't change from
1227 * under us in the middle of an operation.
1229 * NOTE! Right now we'd rather use a "struct inode"
1230 * for this, but as I expect things to move toward
1231 * using dentries instead for most things it is
1232 * probably better to start with the conceptually
1233 * better interface of relying on a path of dentries.
1235 static inline struct dentry
*lock_parent(struct dentry
*dentry
)
1237 struct dentry
*dir
= dget(dentry
->d_parent
);
1239 down(&dir
->d_inode
->i_sem
);
1243 static inline struct dentry
*get_parent(struct dentry
*dentry
)
1245 return dget(dentry
->d_parent
);
1248 static inline void unlock_dir(struct dentry
*dir
)
1250 up(&dir
->d_inode
->i_sem
);
1255 * Whee.. Deadlock country. Happily there are only two VFS
1256 * operations that does this..
1258 static inline void double_down(struct semaphore
*s1
, struct semaphore
*s2
)
1261 if ((unsigned long) s1
< (unsigned long) s2
) {
1262 struct semaphore
*tmp
= s2
;
1271 * Ewwwwwwww... _triple_ lock. We are guaranteed that the 3rd argument is
1272 * not equal to 1st and not equal to 2nd - the first case (target is parent of
1273 * source) would be already caught, the second is plain impossible (target is
1274 * its own parent and that case would be caught even earlier). Very messy.
1275 * I _think_ that it works, but no warranties - please, look it through.
1276 * Pox on bloody lusers who mandated overwriting rename() for directories...
1279 static inline void triple_down(struct semaphore
*s1
,
1280 struct semaphore
*s2
,
1281 struct semaphore
*s3
)
1284 if ((unsigned long) s1
< (unsigned long) s2
) {
1285 if ((unsigned long) s1
< (unsigned long) s3
) {
1286 struct semaphore
*tmp
= s3
;
1289 if ((unsigned long) s1
< (unsigned long) s2
) {
1290 struct semaphore
*tmp
= s2
;
1294 if ((unsigned long) s1
< (unsigned long) s3
) {
1295 struct semaphore
*tmp
= s3
;
1298 if ((unsigned long) s2
< (unsigned long) s3
) {
1299 struct semaphore
*tmp
= s3
;
1304 } else if ((unsigned long) s2
< (unsigned long) s3
) {
1305 struct semaphore
*tmp
= s3
;
1312 static inline void double_up(struct semaphore
*s1
, struct semaphore
*s2
)
1319 static inline void triple_up(struct semaphore
*s1
,
1320 struct semaphore
*s2
,
1321 struct semaphore
*s3
)
1329 static inline void double_lock(struct dentry
*d1
, struct dentry
*d2
)
1331 double_down(&d1
->d_inode
->i_sem
, &d2
->d_inode
->i_sem
);
1334 static inline void double_unlock(struct dentry
*d1
, struct dentry
*d2
)
1336 double_up(&d1
->d_inode
->i_sem
,&d2
->d_inode
->i_sem
);
1341 #endif /* __KERNEL__ */
1343 #endif /* _LINUX_FS_H */