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 */
74 #define WRITERAW 5 /* raw write - don't play with buffer lists */
80 /* public flags for file_system_type */
81 #define FS_REQUIRES_DEV 1
82 #define FS_NO_DCACHE 2 /* Only dcache the necessary things. */
83 #define FS_NO_PRELIM 4 /* prevent preloading of dentries, even if
84 * FS_NO_DCACHE is not set.
86 #define FS_SINGLE 8 /*
87 * Filesystem that can have only one superblock;
88 * kernel-wide vfsmnt is placed in ->kern_mnt by
89 * kern_mount() which must be called _after_
90 * register_filesystem().
92 #define FS_NOMOUNT 16 /* Never mount from userland */
93 #define FS_LITTER 32 /* Keeps the tree in dcache */
94 #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
95 * as nfs_rename() will be cleaned up
98 * These are the fs-independent mount-flags: up to 16 flags are supported
100 #define MS_RDONLY 1 /* Mount read-only */
101 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
102 #define MS_NODEV 4 /* Disallow access to device special files */
103 #define MS_NOEXEC 8 /* Disallow program execution */
104 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
105 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
106 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
107 #define MS_NOATIME 1024 /* Do not update access times. */
108 #define MS_NODIRATIME 2048 /* Do not update directory access times */
111 * Flags that can be altered by MS_REMOUNT
113 #define MS_RMT_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|\
114 MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME)
117 * Magic mount flag number. Has to be or-ed to the flag values.
119 #define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */
120 #define MS_MGC_MSK 0xffff0000 /* magic flag number mask */
122 /* Inode flags - they have nothing to superblock flags now */
124 #define S_SYNC 1 /* Writes are synced at once */
125 #define S_NOATIME 2 /* Do not update access times */
126 #define S_QUOTA 4 /* Quota initialized for file */
127 #define S_APPEND 8 /* Append-only file */
128 #define S_IMMUTABLE 16 /* Immutable file */
129 #define S_DEAD 32 /* removed, but still open directory */
132 * Note that nosuid etc flags are inode-specific: setting some file-system
133 * flags just means all the inodes inherit those flags by default. It might be
134 * possible to override it selectively if you really wanted to with some
135 * ioctl() that is not currently implemented.
137 * Exception: MS_RDONLY is always applied to the entire file system.
139 * Unfortunately, it is possible to change a filesystems flags with it mounted
140 * with files in use. This means that all of the inodes will not have their
141 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
142 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
144 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
146 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
147 #define IS_NOSUID(inode) __IS_FLG(inode, MS_NOSUID)
148 #define IS_NODEV(inode) __IS_FLG(inode, MS_NODEV)
149 #define IS_NOEXEC(inode) __IS_FLG(inode, MS_NOEXEC)
150 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || ((inode)->i_flags & S_SYNC))
151 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
153 #define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA)
154 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
155 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
156 #define IS_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
157 #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
159 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
161 /* the read-only stuff doesn't really belong here, but any other place is
162 probably as bad and I don't want to create yet another include file. */
164 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
165 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
166 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
167 #define BLKGETSIZE _IO(0x12,96) /* return device size */
168 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
169 #define BLKRASET _IO(0x12,98) /* Set read ahead for block device */
170 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
171 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
172 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
173 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
174 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
175 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
177 #define BLKPG _IO(0x12,105)/* See blkpg.h */
178 #define BLKELVGET _IOR(0x12,106,sizeof(blkelv_ioctl_arg_t))/* elevator get */
179 #define BLKELVSET _IOW(0x12,107,sizeof(blkelv_ioctl_arg_t))/* elevator set */
180 /* This was here just to show that the number is taken -
181 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
185 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
186 #define FIBMAP _IO(0x00,1) /* bmap access */
187 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
191 #include <asm/semaphore.h>
192 #include <asm/byteorder.h>
194 extern void update_atime (struct inode
*);
195 #define UPDATE_ATIME(inode) update_atime (inode)
197 extern void buffer_init(unsigned long);
198 extern void inode_init(unsigned long);
201 #define BH_Uptodate 0 /* 1 if the buffer contains valid data */
202 #define BH_Dirty 1 /* 1 if the buffer is dirty */
203 #define BH_Lock 2 /* 1 if the buffer is locked */
204 #define BH_Req 3 /* 0 if the buffer has been invalidated */
205 #define BH_Mapped 4 /* 1 if the buffer has a disk mapping */
206 #define BH_New 5 /* 1 if the buffer is new and not yet written out */
207 #define BH_Protected 6 /* 1 if the buffer is protected */
210 * Try to keep the most commonly used fields in single cache lines (16
211 * bytes) to improve performance. This ordering should be
212 * particularly beneficial on 32-bit processors.
214 * We use the first 16 bytes for the data which is used in searches
215 * over the block hash lists (ie. getblk() and friends).
217 * The second 16 bytes we use for lru buffer scans, as used by
218 * sync_buffers() and refill_freelist(). -- sct
221 /* First cache line: */
222 struct buffer_head
*b_next
; /* Hash queue list */
223 unsigned long b_blocknr
; /* block number */
224 unsigned short b_size
; /* block size */
225 unsigned short b_list
; /* List that this buffer appears */
226 kdev_t b_dev
; /* device (B_FREE = free) */
228 atomic_t b_count
; /* users using this block */
229 kdev_t b_rdev
; /* Real device */
230 unsigned long b_state
; /* buffer state bitmap (see above) */
231 unsigned long b_flushtime
; /* Time when (dirty) buffer should be written */
233 struct buffer_head
*b_next_free
;/* lru/free list linkage */
234 struct buffer_head
*b_prev_free
;/* doubly linked list of buffers */
235 struct buffer_head
*b_this_page
;/* circular list of buffers in one page */
236 struct buffer_head
*b_reqnext
; /* request queue */
238 struct buffer_head
**b_pprev
; /* doubly linked list of hash-queue */
239 char * b_data
; /* pointer to data block (512 byte) */
240 struct page
*b_page
; /* the page this bh is mapped to */
241 void (*b_end_io
)(struct buffer_head
*bh
, int uptodate
); /* I/O completion */
242 void *b_private
; /* reserved for b_end_io */
244 unsigned long b_rsector
; /* Real buffer location on disk */
245 wait_queue_head_t b_wait
;
248 typedef void (bh_end_io_t
)(struct buffer_head
*bh
, int uptodate
);
249 void init_buffer(struct buffer_head
*, bh_end_io_t
*, void *);
251 #define __buffer_state(bh, state) (((bh)->b_state & (1UL << BH_##state)) != 0)
253 #define buffer_uptodate(bh) __buffer_state(bh,Uptodate)
254 #define buffer_dirty(bh) __buffer_state(bh,Dirty)
255 #define buffer_locked(bh) __buffer_state(bh,Lock)
256 #define buffer_req(bh) __buffer_state(bh,Req)
257 #define buffer_mapped(bh) __buffer_state(bh,Mapped)
258 #define buffer_new(bh) __buffer_state(bh,New)
259 #define buffer_protected(bh) __buffer_state(bh,Protected)
261 #define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK)
263 extern void set_bh_page(struct buffer_head
*bh
, struct page
*page
, unsigned long offset
);
265 #define touch_buffer(bh) SetPageReferenced(bh->b_page)
268 #include <linux/pipe_fs_i.h>
269 #include <linux/minix_fs_i.h>
270 #include <linux/ext2_fs_i.h>
271 #include <linux/hpfs_fs_i.h>
272 #include <linux/ntfs_fs_i.h>
273 #include <linux/msdos_fs_i.h>
274 #include <linux/umsdos_fs_i.h>
275 #include <linux/iso_fs_i.h>
276 #include <linux/nfs_fs_i.h>
277 #include <linux/sysv_fs_i.h>
278 #include <linux/affs_fs_i.h>
279 #include <linux/ufs_fs_i.h>
280 #include <linux/efs_fs_i.h>
281 #include <linux/coda_fs_i.h>
282 #include <linux/romfs_fs_i.h>
283 #include <linux/smb_fs_i.h>
284 #include <linux/hfs_fs_i.h>
285 #include <linux/adfs_fs_i.h>
286 #include <linux/qnx4_fs_i.h>
287 #include <linux/bfs_fs_i.h>
288 #include <linux/udf_fs_i.h>
289 #include <linux/ncp_fs_i.h>
290 #include <linux/proc_fs_i.h>
291 #include <linux/usbdev_fs_i.h>
294 * Attribute flags. These should be or-ed together to figure out what
301 #define ATTR_ATIME 16
302 #define ATTR_MTIME 32
303 #define ATTR_CTIME 64
304 #define ATTR_ATIME_SET 128
305 #define ATTR_MTIME_SET 256
306 #define ATTR_FORCE 512 /* Not a change, but a change it */
307 #define ATTR_ATTR_FLAG 1024
310 * This is the Inode Attributes structure, used for notify_change(). It
311 * uses the above definitions as flags, to know which values have changed.
312 * Also, in this manner, a Filesystem can look at only the values it cares
313 * about. Basically, these are the attributes that the VFS layer can
314 * request to change from the FS layer.
316 * Derek Atkins <warlord@MIT.EDU> 94-10-20
319 unsigned int ia_valid
;
327 unsigned int ia_attr_flags
;
331 * This is the inode attributes flag definitions
333 #define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */
334 #define ATTR_FLAG_NOATIME 2 /* Don't update atime */
335 #define ATTR_FLAG_APPEND 4 /* Append-only file */
336 #define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */
337 #define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */
340 * Includes for diskquotas and mount structures.
342 #include <linux/quota.h>
343 #include <linux/mount.h>
346 * oh the beauties of C type declarations.
349 struct address_space
;
351 struct address_space_operations
{
352 int (*writepage
)(struct file
*, struct page
*);
353 int (*readpage
)(struct file
*, struct page
*);
354 int (*sync_page
)(struct page
*);
355 int (*prepare_write
)(struct file
*, struct page
*, unsigned, unsigned);
356 int (*commit_write
)(struct file
*, struct page
*, unsigned, unsigned);
357 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
358 int (*bmap
)(struct address_space
*, long);
361 struct address_space
{
362 struct list_head pages
; /* list of pages */
363 unsigned long nrpages
; /* number of pages */
364 struct address_space_operations
*a_ops
; /* methods */
365 void *host
; /* owner: inode, block_device */
366 struct vm_area_struct
*i_mmap
; /* list of mappings */
367 spinlock_t i_shared_lock
; /* and spinlock protecting it */
370 struct block_device
{
371 struct list_head bd_hash
;
373 /* struct address_space bd_data; */
374 dev_t bd_dev
; /* not a kdev_t - it's a search key */
376 const struct block_device_operations
*bd_op
;
377 struct semaphore bd_sem
; /* open/close mutex */
381 struct list_head i_hash
;
382 struct list_head i_list
;
383 struct list_head i_dentry
;
397 unsigned long i_blksize
;
398 unsigned long i_blocks
;
399 unsigned long i_version
;
400 struct semaphore i_sem
;
401 struct semaphore i_zombie
;
402 struct inode_operations
*i_op
;
403 struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
404 struct super_block
*i_sb
;
405 wait_queue_head_t i_wait
;
406 struct file_lock
*i_flock
;
407 struct address_space
*i_mapping
;
408 struct address_space i_data
;
409 struct dquot
*i_dquot
[MAXQUOTAS
];
410 struct pipe_inode_info
*i_pipe
;
411 struct block_device
*i_bdev
;
413 unsigned long i_state
;
415 unsigned int i_flags
;
416 unsigned char i_sock
;
418 atomic_t i_writecount
;
419 unsigned int i_attr_flags
;
422 struct minix_inode_info minix_i
;
423 struct ext2_inode_info ext2_i
;
424 struct hpfs_inode_info hpfs_i
;
425 struct ntfs_inode_info ntfs_i
;
426 struct msdos_inode_info msdos_i
;
427 struct umsdos_inode_info umsdos_i
;
428 struct iso_inode_info isofs_i
;
429 struct nfs_inode_info nfs_i
;
430 struct sysv_inode_info sysv_i
;
431 struct affs_inode_info affs_i
;
432 struct ufs_inode_info ufs_i
;
433 struct efs_inode_info efs_i
;
434 struct romfs_inode_info romfs_i
;
435 struct coda_inode_info coda_i
;
436 struct smb_inode_info smbfs_i
;
437 struct hfs_inode_info hfs_i
;
438 struct adfs_inode_info adfs_i
;
439 struct qnx4_inode_info qnx4_i
;
440 struct bfs_inode_info bfs_i
;
441 struct udf_inode_info udf_i
;
442 struct ncp_inode_info ncpfs_i
;
443 struct proc_inode_info proc_i
;
444 struct socket socket_i
;
445 struct usbdev_inode_info usbdev_i
;
450 /* Inode state bits.. */
456 extern void __mark_inode_dirty(struct inode
*);
457 static inline void mark_inode_dirty(struct inode
*inode
)
459 if (!(inode
->i_state
& I_DIRTY
))
460 __mark_inode_dirty(inode
);
464 int pid
; /* pid or -pgrp where SIGIO should be sent */
465 uid_t uid
, euid
; /* uid/euid of process setting the owner */
466 int signum
; /* posix.1b rt signal to be delivered on IO */
470 struct list_head f_list
;
471 struct dentry
*f_dentry
;
472 struct vfsmount
*f_vfsmnt
;
473 struct file_operations
*f_op
;
475 unsigned int f_flags
;
478 unsigned long f_reada
, f_ramax
, f_raend
, f_ralen
, f_rawin
;
479 struct fown_struct f_owner
;
480 unsigned int f_uid
, f_gid
;
483 unsigned long f_version
;
485 /* needed for tty driver, and maybe others */
488 extern spinlock_t files_lock
;
489 #define file_list_lock() spin_lock(&files_lock);
490 #define file_list_unlock() spin_unlock(&files_lock);
492 #define get_file(x) atomic_inc(&(x)->f_count)
493 #define file_count(x) atomic_read(&(x)->f_count)
495 extern int init_private_file(struct file
*, struct dentry
*, int);
499 #define FL_BROKEN 4 /* broken flock() emulation */
500 #define FL_ACCESS 8 /* for processes suspended by mandatory locking */
501 #define FL_LOCKD 16 /* lock held by rpc.lockd */
504 * The POSIX file lock owner is determined by
505 * the "struct files_struct" in the thread group
506 * (or NULL for no owner - BSD locks).
508 * Lockd stuffs a "host" pointer into this.
510 typedef struct files_struct
*fl_owner_t
;
513 struct file_lock
*fl_next
; /* singly linked list for this inode */
514 struct list_head fl_link
; /* doubly linked list of all locks */
515 struct list_head fl_block
; /* circular list of blocked processes */
518 wait_queue_head_t fl_wait
;
519 struct file
*fl_file
;
520 unsigned char fl_flags
;
521 unsigned char fl_type
;
525 void (*fl_notify
)(struct file_lock
*); /* unblock callback */
526 void (*fl_insert
)(struct file_lock
*); /* lock insertion callback */
527 void (*fl_remove
)(struct file_lock
*); /* lock removal callback */
530 struct nfs_lock_info nfs_fl
;
534 /* The following constant reflects the upper bound of the file/locking space */
536 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
537 #define OFFSET_MAX INT_LIMIT(loff_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
*);
548 extern void locks_remove_posix(struct file
*, fl_owner_t
);
549 extern void locks_remove_flock(struct file
*);
550 extern struct file_lock
*posix_test_lock(struct file
*, struct file_lock
*);
551 extern int posix_lock_file(struct file
*, struct file_lock
*, unsigned int);
552 extern void posix_block_lock(struct file_lock
*, struct file_lock
*);
553 extern void posix_unblock_lock(struct file_lock
*);
555 struct fasync_struct
{
558 struct fasync_struct
*fa_next
; /* singly linked list */
559 struct file
*fa_file
;
562 #define FASYNC_MAGIC 0x4601
564 /* SMP safe fasync helpers: */
565 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
566 /* can be called from interrupts */
567 extern void kill_fasync(struct fasync_struct
**, int, int);
568 /* only for net: no internal synchronization */
569 extern void __kill_fasync(struct fasync_struct
*, int, int);
572 struct dentry
*dentry
;
573 struct vfsmount
*mnt
;
579 #define DQUOT_USR_ENABLED 0x01 /* User diskquotas enabled */
580 #define DQUOT_GRP_ENABLED 0x02 /* Group diskquotas enabled */
582 struct quota_mount_options
584 unsigned int flags
; /* Flags for diskquotas on this device */
585 struct semaphore dqio_sem
; /* lock device while I/O in progress */
586 struct semaphore dqoff_sem
; /* serialize quota_off() and quota_on() on device */
587 struct file
*files
[MAXQUOTAS
]; /* fp's to quotafiles */
588 time_t inode_expire
[MAXQUOTAS
]; /* expiretime for inode-quota */
589 time_t block_expire
[MAXQUOTAS
]; /* expiretime for block-quota */
590 char rsquash
[MAXQUOTAS
]; /* for quotas threat root as any other user */
597 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
599 #include <linux/minix_fs_sb.h>
600 #include <linux/ext2_fs_sb.h>
601 #include <linux/hpfs_fs_sb.h>
602 #include <linux/ntfs_fs_sb.h>
603 #include <linux/msdos_fs_sb.h>
604 #include <linux/iso_fs_sb.h>
605 #include <linux/nfs_fs_sb.h>
606 #include <linux/sysv_fs_sb.h>
607 #include <linux/affs_fs_sb.h>
608 #include <linux/ufs_fs_sb.h>
609 #include <linux/efs_fs_sb.h>
610 #include <linux/romfs_fs_sb.h>
611 #include <linux/smb_fs_sb.h>
612 #include <linux/hfs_fs_sb.h>
613 #include <linux/adfs_fs_sb.h>
614 #include <linux/qnx4_fs_sb.h>
615 #include <linux/bfs_fs_sb.h>
616 #include <linux/udf_fs_sb.h>
617 #include <linux/ncp_fs_sb.h>
618 #include <linux/usbdev_fs_sb.h>
620 extern struct list_head super_blocks
;
622 #define sb_entry(list) list_entry((list), struct super_block, s_list)
624 struct list_head s_list
; /* Keep this first */
626 unsigned long s_blocksize
;
627 unsigned char s_blocksize_bits
;
628 unsigned char s_lock
;
629 unsigned char s_dirt
;
630 struct file_system_type
*s_type
;
631 struct super_operations
*s_op
;
632 struct dquot_operations
*dq_op
;
633 unsigned long s_flags
;
634 unsigned long s_magic
;
635 struct dentry
*s_root
;
636 wait_queue_head_t s_wait
;
638 struct list_head s_dirty
; /* dirty inodes */
639 struct list_head s_files
;
641 struct block_device
*s_bdev
;
642 struct list_head s_mounts
; /* vfsmount(s) of this one */
643 struct quota_mount_options s_dquot
; /* Diskquota specific options */
646 struct minix_sb_info minix_sb
;
647 struct ext2_sb_info ext2_sb
;
648 struct hpfs_sb_info hpfs_sb
;
649 struct ntfs_sb_info ntfs_sb
;
650 struct msdos_sb_info msdos_sb
;
651 struct isofs_sb_info isofs_sb
;
652 struct nfs_sb_info nfs_sb
;
653 struct sysv_sb_info sysv_sb
;
654 struct affs_sb_info affs_sb
;
655 struct ufs_sb_info ufs_sb
;
656 struct efs_sb_info efs_sb
;
657 struct romfs_sb_info romfs_sb
;
658 struct smb_sb_info smbfs_sb
;
659 struct hfs_sb_info hfs_sb
;
660 struct adfs_sb_info adfs_sb
;
661 struct qnx4_sb_info qnx4_sb
;
662 struct bfs_sb_info bfs_sb
;
663 struct udf_sb_info udf_sb
;
664 struct ncp_sb_info ncpfs_sb
;
665 struct usbdev_sb_info usbdevfs_sb
;
669 * The next field is for VFS *only*. No filesystems have any business
670 * even looking at it. You had been warned.
672 struct semaphore s_vfs_rename_sem
; /* Kludge */
674 /* The next field is used by knfsd when converting a (inode number based)
675 * file handle into a dentry. As it builds a path in the dcache tree from
676 * the bottom up, there may for a time be a subpath of dentrys which is not
677 * connected to the main tree. This semaphore ensure that there is only ever
678 * one such free path per filesystem. Note that unconnected files (or other
679 * non-directories) are allowed, but not unconnected diretories.
681 struct semaphore s_nfsd_free_path_sem
;
685 * VFS helper functions..
687 extern int vfs_create(struct inode
*, struct dentry
*, int);
688 extern int vfs_mkdir(struct inode
*, struct dentry
*, int);
689 extern int vfs_mknod(struct inode
*, struct dentry
*, int, dev_t
);
690 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
691 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
692 extern int vfs_rmdir(struct inode
*, struct dentry
*);
693 extern int vfs_unlink(struct inode
*, struct dentry
*);
694 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
697 * This is the "filldir" function type, used by readdir() to let
698 * the kernel specify what kind of dirent layout it wants to have.
699 * This allows the kernel to read directories into kernel space or
700 * to have different dirent layouts depending on the binary type.
702 typedef int (*filldir_t
)(void *, const char *, int, off_t
, ino_t
);
704 struct block_device_operations
{
705 int (*open
) (struct inode
*, struct file
*);
706 int (*release
) (struct inode
*, struct file
*);
707 int (*ioctl
) (struct inode
*, struct file
*, unsigned, unsigned long);
708 int (*check_media_change
) (kdev_t
);
709 int (*revalidate
) (kdev_t
);
714 * read, write, poll, fsync, readv, writev can be called
715 * without the big kernel lock held in all filesystems.
717 struct file_operations
{
718 struct module
*owner
;
719 loff_t (*llseek
) (struct file
*, loff_t
, int);
720 ssize_t (*read
) (struct file
*, char *, size_t, loff_t
*);
721 ssize_t (*write
) (struct file
*, const char *, size_t, loff_t
*);
722 int (*readdir
) (struct file
*, void *, filldir_t
);
723 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
724 int (*ioctl
) (struct inode
*, struct file
*, unsigned int, unsigned long);
725 int (*mmap
) (struct file
*, struct vm_area_struct
*);
726 int (*open
) (struct inode
*, struct file
*);
727 int (*flush
) (struct file
*);
728 int (*release
) (struct inode
*, struct file
*);
729 int (*fsync
) (struct file
*, struct dentry
*, int datasync
);
730 int (*fasync
) (int, struct file
*, int);
731 int (*lock
) (struct file
*, int, struct file_lock
*);
732 ssize_t (*readv
) (struct file
*, const struct iovec
*, unsigned long, loff_t
*);
733 ssize_t (*writev
) (struct file
*, const struct iovec
*, unsigned long, loff_t
*);
736 struct inode_operations
{
737 int (*create
) (struct inode
*,struct dentry
*,int);
738 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*);
739 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
740 int (*unlink
) (struct inode
*,struct dentry
*);
741 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
742 int (*mkdir
) (struct inode
*,struct dentry
*,int);
743 int (*rmdir
) (struct inode
*,struct dentry
*);
744 int (*mknod
) (struct inode
*,struct dentry
*,int,int);
745 int (*rename
) (struct inode
*, struct dentry
*,
746 struct inode
*, struct dentry
*);
747 int (*readlink
) (struct dentry
*, char *,int);
748 int (*follow_link
) (struct dentry
*, struct nameidata
*);
749 void (*truncate
) (struct inode
*);
750 int (*permission
) (struct inode
*, int);
751 int (*revalidate
) (struct dentry
*);
752 int (*setattr
) (struct dentry
*, struct iattr
*);
753 int (*getattr
) (struct dentry
*, struct iattr
*);
757 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
758 * without the big kernel lock held in all filesystems.
760 struct super_operations
{
761 void (*read_inode
) (struct inode
*);
762 void (*write_inode
) (struct inode
*, int);
763 void (*put_inode
) (struct inode
*);
764 void (*delete_inode
) (struct inode
*);
765 void (*put_super
) (struct super_block
*);
766 void (*write_super
) (struct super_block
*);
767 int (*statfs
) (struct super_block
*, struct statfs
*);
768 int (*remount_fs
) (struct super_block
*, int *, char *);
769 void (*clear_inode
) (struct inode
*);
770 void (*umount_begin
) (struct super_block
*);
773 struct dquot_operations
{
774 void (*initialize
) (struct inode
*, short);
775 void (*drop
) (struct inode
*);
776 int (*alloc_block
) (const struct inode
*, unsigned long, char);
777 int (*alloc_inode
) (const struct inode
*, unsigned long);
778 void (*free_block
) (const struct inode
*, unsigned long);
779 void (*free_inode
) (const struct inode
*, unsigned long);
780 int (*transfer
) (struct dentry
*, struct iattr
*);
783 struct file_system_type
{
786 struct super_block
*(*read_super
) (struct super_block
*, void *, int);
787 struct module
*owner
;
788 struct vfsmount
*kern_mnt
; /* For kernel mount, if it's FS_SINGLE fs */
789 struct file_system_type
* next
;
792 #define DECLARE_FSTYPE(var,type,read,flags) \
793 struct file_system_type var = { \
797 owner: THIS_MODULE, \
800 #define DECLARE_FSTYPE_DEV(var,type,read) \
801 DECLARE_FSTYPE(var,type,read,FS_REQUIRES_DEV)
803 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
804 #define fops_get(fops) \
805 (((fops) && (fops)->owner) \
806 ? ( try_inc_mod_count((fops)->owner) ? (fops) : NULL ) \
809 #define fops_put(fops) \
811 if ((fops) && (fops)->owner) \
812 __MOD_DEC_USE_COUNT((fops)->owner); \
815 extern int register_filesystem(struct file_system_type
*);
816 extern int unregister_filesystem(struct file_system_type
*);
817 extern struct vfsmount
*kern_mount(struct file_system_type
*);
818 extern void kern_umount(struct vfsmount
*);
819 extern int may_umount(struct vfsmount
*);
820 extern long do_mount(char *, char *, char *, unsigned long, void *);
823 extern int vfs_statfs(struct super_block
*, struct statfs
*);
825 /* Return value for VFS lock functions - tells locks.c to lock conventionally
826 * REALLY kosha for root NFS and nfs_lock
828 #define LOCK_USE_CLNT 1
830 #define FLOCK_VERIFY_READ 1
831 #define FLOCK_VERIFY_WRITE 2
833 extern int locks_mandatory_locked(struct inode
*);
834 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
837 * Candidates for mandatory locking have the setgid bit set
838 * but no group execute bit - an otherwise meaningless combination.
840 #define MANDATORY_LOCK(inode) \
841 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
843 static inline int locks_verify_locked(struct inode
*inode
)
845 if (MANDATORY_LOCK(inode
))
846 return locks_mandatory_locked(inode
);
850 static inline int locks_verify_area(int read_write
, struct inode
*inode
,
851 struct file
*filp
, loff_t offset
,
854 if (inode
->i_flock
&& MANDATORY_LOCK(inode
))
855 return locks_mandatory_area(read_write
, inode
, filp
, offset
, count
);
859 static inline int locks_verify_truncate(struct inode
*inode
,
863 if (inode
->i_flock
&& MANDATORY_LOCK(inode
))
864 return locks_mandatory_area(
865 FLOCK_VERIFY_WRITE
, inode
, filp
,
866 size
< inode
->i_size
? size
: inode
->i_size
,
867 (size
< inode
->i_size
? inode
->i_size
- size
868 : size
- inode
->i_size
)
876 asmlinkage
long sys_open(const char *, int, int);
877 asmlinkage
long sys_close(unsigned int); /* yes, it's really unsigned */
878 extern int do_close(unsigned int, int); /* yes, it's really unsigned */
879 extern int do_truncate(struct dentry
*, loff_t start
);
881 extern struct file
*filp_open(const char *, int, int);
882 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int);
883 extern int filp_close(struct file
*, fl_owner_t id
);
884 extern char * getname(const char *);
887 extern void vfs_caches_init(unsigned long);
889 #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
890 #define putname(name) kmem_cache_free(names_cachep, (void *)(name))
892 enum {BDEV_FILE
, BDEV_SWAP
, BDEV_FS
, BDEV_RAW
};
893 extern int register_blkdev(unsigned int, const char *, struct block_device_operations
*);
894 extern int unregister_blkdev(unsigned int, const char *);
895 extern struct block_device
*bdget(dev_t
);
896 extern void bdput(struct block_device
*);
897 extern int blkdev_open(struct inode
*, struct file
*);
898 extern struct file_operations def_blk_fops
;
899 extern struct file_operations def_fifo_fops
;
900 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
901 extern int blkdev_get(struct block_device
*, mode_t
, unsigned, int);
902 extern int blkdev_put(struct block_device
*, int);
905 extern const struct block_device_operations
*get_blkfops(unsigned int);
906 extern int register_chrdev(unsigned int, const char *, struct file_operations
*);
907 extern int unregister_chrdev(unsigned int, const char *);
908 extern int chrdev_open(struct inode
*, struct file
*);
909 extern const char * bdevname(kdev_t
);
910 extern const char * cdevname(kdev_t
);
911 extern const char * kdevname(kdev_t
);
912 extern void init_special_inode(struct inode
*, umode_t
, int);
914 /* Invalid inode operations -- fs/bad_inode.c */
915 extern void make_bad_inode(struct inode
*);
916 extern int is_bad_inode(struct inode
*);
918 extern struct file_operations read_fifo_fops
;
919 extern struct file_operations write_fifo_fops
;
920 extern struct file_operations rdwr_fifo_fops
;
921 extern struct file_operations read_pipe_fops
;
922 extern struct file_operations write_pipe_fops
;
923 extern struct file_operations rdwr_pipe_fops
;
925 extern int fs_may_remount_ro(struct super_block
*);
927 extern int try_to_free_buffers(struct page
*, int);
928 extern void refile_buffer(struct buffer_head
* buf
);
931 #define BUF_LOCKED 1 /* Buffers scheduled for write */
932 #define BUF_DIRTY 2 /* Dirty buffers, not yet scheduled for write */
933 #define BUF_PROTECTED 3 /* Ramdisk persistent storage */
937 * This is called by bh->b_end_io() handlers when I/O has completed.
939 static inline void mark_buffer_uptodate(struct buffer_head
* bh
, int on
)
942 set_bit(BH_Uptodate
, &bh
->b_state
);
944 clear_bit(BH_Uptodate
, &bh
->b_state
);
947 #define atomic_set_buffer_clean(bh) test_and_clear_bit(BH_Dirty, &(bh)->b_state)
949 static inline void __mark_buffer_clean(struct buffer_head
*bh
)
954 static inline void mark_buffer_clean(struct buffer_head
* bh
)
956 if (atomic_set_buffer_clean(bh
))
957 __mark_buffer_clean(bh
);
960 #define atomic_set_buffer_protected(bh) test_and_set_bit(BH_Protected, &(bh)->b_state)
962 static inline void __mark_buffer_protected(struct buffer_head
*bh
)
967 static inline void mark_buffer_protected(struct buffer_head
* bh
)
969 if (!atomic_set_buffer_protected(bh
))
970 __mark_buffer_protected(bh
);
973 extern void FASTCALL(__mark_buffer_dirty(struct buffer_head
*bh
, int flag
));
974 extern void FASTCALL(mark_buffer_dirty(struct buffer_head
*bh
, int flag
));
976 #define atomic_set_buffer_dirty(bh) test_and_set_bit(BH_Dirty, &(bh)->b_state)
979 * If an error happens during the make_request, this function
980 * has to be recalled. It marks the buffer as clean and not
981 * uptodate, and it notifys the upper layer about the end
984 static inline void buffer_IO_error(struct buffer_head
* bh
)
986 mark_buffer_clean(bh
);
988 * b_end_io has to clear the BH_Uptodate bitflag in the error case!
993 extern void balance_dirty(kdev_t
);
994 extern int check_disk_change(kdev_t
);
995 extern int invalidate_inodes(struct super_block
*);
996 extern void invalidate_inode_pages(struct inode
*);
997 #define invalidate_buffers(dev) __invalidate_buffers((dev), 0)
998 #define destroy_buffers(dev) __invalidate_buffers((dev), 1)
999 extern void __invalidate_buffers(kdev_t dev
, int);
1000 extern void sync_inodes(kdev_t
);
1001 extern void write_inode_now(struct inode
*, int);
1002 extern void sync_dev(kdev_t
);
1003 extern int fsync_dev(kdev_t
);
1004 extern void sync_supers(kdev_t
);
1005 extern int bmap(struct inode
*, int);
1006 extern int notify_change(struct dentry
*, struct iattr
*);
1007 extern int permission(struct inode
*, int);
1008 extern int get_write_access(struct inode
*);
1009 extern int deny_write_access(struct file
*);
1010 static inline void put_write_access(struct inode
* inode
)
1012 atomic_dec(&inode
->i_writecount
);
1014 static inline void allow_write_access(struct file
*file
)
1017 atomic_inc(&file
->f_dentry
->d_inode
->i_writecount
);
1019 extern int do_pipe(int *);
1021 extern int open_namei(const char *, int, int, struct nameidata
*);
1023 extern int kernel_read(struct file
*, unsigned long, char *, unsigned long);
1024 extern struct file
* open_exec(const char *);
1026 /* fs/dcache.c -- generic fs support functions */
1027 extern int is_subdir(struct dentry
*, struct dentry
*);
1028 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
1031 * Kernel pointers have redundant information, so we can use a
1032 * scheme where we can return either an error code or a dentry
1033 * pointer with the same return value.
1035 * This should be a per-architecture thing, to allow different
1036 * error and pointer decisions.
1038 #define ERR_PTR(err) ((void *)((long)(err)))
1039 #define PTR_ERR(ptr) ((long)(ptr))
1040 #define IS_ERR(ptr) ((unsigned long)(ptr) > (unsigned long)(-1000))
1043 * The bitmask for a lookup event:
1044 * - follow links at the end
1045 * - require a directory
1046 * - ending slashes ok even for nonexistent files
1047 * - internal "there are more path compnents" flag
1049 #define LOOKUP_FOLLOW (1)
1050 #define LOOKUP_DIRECTORY (2)
1051 #define LOOKUP_CONTINUE (4)
1052 #define LOOKUP_POSITIVE (8)
1053 #define LOOKUP_PARENT (16)
1054 #define LOOKUP_NOALT (32)
1056 * Type of the last component on LOOKUP_PARENT
1058 enum {LAST_NORM
, LAST_ROOT
, LAST_DOT
, LAST_DOTDOT
, LAST_BIND
};
1061 * "descriptor" for what we're up to with a read for sendfile().
1062 * This allows us to use the same read code yet
1063 * have multiple different users of the data that
1064 * we read from a file.
1066 * The simplest case just copies the data to user
1074 } read_descriptor_t
;
1076 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*, unsigned long, unsigned long);
1078 /* needed for stackable file system support */
1079 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
1081 extern int __user_walk(const char *, unsigned, struct nameidata
*);
1082 extern int path_init(const char *, unsigned, struct nameidata
*);
1083 extern int path_walk(const char *, struct nameidata
*);
1084 extern void path_release(struct nameidata
*);
1085 extern int follow_down(struct vfsmount
**, struct dentry
**);
1086 extern int follow_up(struct vfsmount
**, struct dentry
**);
1087 extern struct dentry
* lookup_one(const char *, struct dentry
*);
1088 extern struct dentry
* lookup_hash(struct qstr
*, struct dentry
*);
1089 #define user_path_walk(name,nd) __user_walk(name, LOOKUP_FOLLOW|LOOKUP_POSITIVE, nd)
1090 #define user_path_walk_link(name,nd) __user_walk(name, LOOKUP_POSITIVE, nd)
1092 extern void iput(struct inode
*);
1093 extern void force_delete(struct inode
*);
1094 extern struct inode
* igrab(struct inode
*);
1095 extern ino_t
iunique(struct super_block
*, ino_t
);
1097 typedef int (*find_inode_t
)(struct inode
*, unsigned long, void *);
1098 extern struct inode
* iget4(struct super_block
*, unsigned long, find_inode_t
, void *);
1099 static inline struct inode
*iget(struct super_block
*sb
, unsigned long ino
)
1101 return iget4(sb
, ino
, NULL
, NULL
);
1104 extern void clear_inode(struct inode
*);
1105 extern struct inode
* get_empty_inode(void);
1107 extern void insert_inode_hash(struct inode
*);
1108 extern void remove_inode_hash(struct inode
*);
1109 extern struct file
* get_empty_filp(void);
1110 extern void file_move(struct file
*f
, struct list_head
*list
);
1111 extern void file_moveto(struct file
*new, struct file
*old
);
1112 extern struct buffer_head
* get_hash_table(kdev_t
, int, int);
1113 extern struct buffer_head
* getblk(kdev_t
, int, int);
1114 extern void ll_rw_block(int, int, struct buffer_head
* bh
[]);
1115 extern int is_read_only(kdev_t
);
1116 extern void __brelse(struct buffer_head
*);
1117 static inline void brelse(struct buffer_head
*buf
)
1122 extern void __bforget(struct buffer_head
*);
1123 static inline void bforget(struct buffer_head
*buf
)
1128 extern void set_blocksize(kdev_t
, int);
1129 extern unsigned int get_hardblocksize(kdev_t
);
1130 extern struct buffer_head
* bread(kdev_t
, int, int);
1131 extern struct buffer_head
* breada(kdev_t
, int, int, unsigned int, unsigned int);
1132 extern void wakeup_bdflush(int wait
);
1134 extern int brw_page(int, struct page
*, kdev_t
, int [], int);
1136 typedef int (get_block_t
)(struct inode
*,long,struct buffer_head
*,int);
1138 /* Generic buffer handling for block filesystems.. */
1139 extern int block_flushpage(struct page
*, unsigned long);
1140 extern int block_symlink(struct inode
*, const char *, int);
1141 extern int block_write_full_page(struct page
*, get_block_t
*);
1142 extern int block_read_full_page(struct page
*, get_block_t
*);
1143 extern int block_prepare_write(struct page
*, unsigned, unsigned, get_block_t
*);
1144 extern int cont_prepare_write(struct page
*, unsigned, unsigned, get_block_t
*,
1146 extern int block_sync_page(struct page
*);
1148 int generic_block_bmap(struct address_space
*, long, get_block_t
*);
1149 int generic_commit_write(struct file
*, struct page
*, unsigned, unsigned);
1151 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
1152 extern ssize_t
generic_file_read(struct file
*, char *, size_t, loff_t
*);
1153 extern ssize_t
generic_file_write(struct file
*, const char *, size_t, loff_t
*);
1154 extern void do_generic_file_read(struct file
*, loff_t
*, read_descriptor_t
*, read_actor_t
);
1156 extern ssize_t
generic_read_dir(struct file
*, char *, size_t, loff_t
*);
1158 extern struct file_operations generic_ro_fops
;
1160 extern int vfs_readlink(struct dentry
*, char *, int, const char *);
1161 extern int vfs_follow_link(struct nameidata
*, const char *);
1162 extern int page_readlink(struct dentry
*, char *, int);
1163 extern int page_follow_link(struct dentry
*, struct nameidata
*);
1164 extern struct inode_operations page_symlink_inode_operations
;
1166 extern int vfs_readdir(struct file
*, filldir_t
, void *);
1167 extern int dcache_readdir(struct file
*, void *, filldir_t
);
1169 extern struct file_system_type
*get_fs_type(const char *name
);
1170 extern struct super_block
*get_super(kdev_t
);
1171 struct super_block
*get_empty_super(void);
1172 extern void put_super(kdev_t
);
1173 unsigned long generate_cluster(kdev_t
, int b
[], int);
1174 unsigned long generate_cluster_swab32(kdev_t
, int b
[], int);
1175 extern kdev_t ROOT_DEV
;
1176 extern char root_device_name
[];
1179 extern void show_buffers(void);
1180 extern void mount_root(void);
1182 #ifdef CONFIG_BLK_DEV_INITRD
1183 extern kdev_t real_root_dev
;
1184 extern int change_root(kdev_t
, const char *);
1187 extern ssize_t
char_read(struct file
*, char *, size_t, loff_t
*);
1188 extern ssize_t
block_read(struct file
*, char *, size_t, loff_t
*);
1189 extern int read_ahead
[];
1191 extern ssize_t
char_write(struct file
*, const char *, size_t, loff_t
*);
1192 extern ssize_t
block_write(struct file
*, const char *, size_t, loff_t
*);
1194 extern int file_fsync(struct file
*, struct dentry
*, int);
1195 extern int generic_buffer_fdatasync(struct inode
*inode
, unsigned long start_idx
, unsigned long end_idx
);
1197 extern int inode_change_ok(struct inode
*, struct iattr
*);
1198 extern void inode_setattr(struct inode
*, struct iattr
*);
1201 * Common dentry functions for inclusion in the VFS
1202 * or in other stackable file systems. Some of these
1203 * functions were in linux/fs/ C (VFS) files.
1208 * Locking the parent is needed to:
1209 * - serialize directory operations
1210 * - make sure the parent doesn't change from
1211 * under us in the middle of an operation.
1213 * NOTE! Right now we'd rather use a "struct inode"
1214 * for this, but as I expect things to move toward
1215 * using dentries instead for most things it is
1216 * probably better to start with the conceptually
1217 * better interface of relying on a path of dentries.
1219 static inline struct dentry
*lock_parent(struct dentry
*dentry
)
1221 struct dentry
*dir
= dget(dentry
->d_parent
);
1223 down(&dir
->d_inode
->i_sem
);
1227 static inline struct dentry
*get_parent(struct dentry
*dentry
)
1229 return dget(dentry
->d_parent
);
1232 static inline void unlock_dir(struct dentry
*dir
)
1234 up(&dir
->d_inode
->i_sem
);
1239 * Whee.. Deadlock country. Happily there are only two VFS
1240 * operations that does this..
1242 static inline void double_down(struct semaphore
*s1
, struct semaphore
*s2
)
1245 if ((unsigned long) s1
< (unsigned long) s2
) {
1246 struct semaphore
*tmp
= s2
;
1255 * Ewwwwwwww... _triple_ lock. We are guaranteed that the 3rd argument is
1256 * not equal to 1st and not equal to 2nd - the first case (target is parent of
1257 * source) would be already caught, the second is plain impossible (target is
1258 * its own parent and that case would be caught even earlier). Very messy.
1259 * I _think_ that it works, but no warranties - please, look it through.
1260 * Pox on bloody lusers who mandated overwriting rename() for directories...
1263 static inline void triple_down(struct semaphore
*s1
,
1264 struct semaphore
*s2
,
1265 struct semaphore
*s3
)
1268 if ((unsigned long) s1
< (unsigned long) s2
) {
1269 if ((unsigned long) s1
< (unsigned long) s3
) {
1270 struct semaphore
*tmp
= s3
;
1273 if ((unsigned long) s1
< (unsigned long) s2
) {
1274 struct semaphore
*tmp
= s2
;
1278 if ((unsigned long) s1
< (unsigned long) s3
) {
1279 struct semaphore
*tmp
= s3
;
1282 if ((unsigned long) s2
< (unsigned long) s3
) {
1283 struct semaphore
*tmp
= s3
;
1288 } else if ((unsigned long) s2
< (unsigned long) s3
) {
1289 struct semaphore
*tmp
= s3
;
1296 static inline void double_up(struct semaphore
*s1
, struct semaphore
*s2
)
1303 static inline void triple_up(struct semaphore
*s1
,
1304 struct semaphore
*s2
,
1305 struct semaphore
*s3
)
1313 static inline void double_lock(struct dentry
*d1
, struct dentry
*d2
)
1315 double_down(&d1
->d_inode
->i_sem
, &d2
->d_inode
->i_sem
);
1318 static inline void double_unlock(struct dentry
*d1
, struct dentry
*d2
)
1320 double_up(&d1
->d_inode
->i_sem
,&d2
->d_inode
->i_sem
);
1325 #endif /* __KERNEL__ */
1327 #endif /* _LINUX_FS_H */