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TOMOYO Linux Cross Reference
Linux/include/linux/fs.h

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  1 #ifndef _LINUX_FS_H
  2 #define _LINUX_FS_H
  3 
  4 /*
  5  * This file has definitions for some important file table
  6  * structures etc.
  7  */
  8 
  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/kdev_t.h>
 15 #include <linux/ioctl.h>
 16 #include <linux/list.h>
 17 #include <linux/dcache.h>
 18 #include <linux/stat.h>
 19 #include <linux/cache.h>
 20 #include <linux/radix-tree.h>
 21 #include <linux/kobject.h>
 22 #include <asm/atomic.h>
 23 
 24 struct iovec;
 25 struct nameidata;
 26 struct pipe_inode_info;
 27 struct poll_table_struct;
 28 struct kstatfs;
 29 struct vm_area_struct;
 30 struct vfsmount;
 31 
 32 /*
 33  * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
 34  * the file limit at runtime and only root can increase the per-process
 35  * nr_file rlimit, so it's safe to set up a ridiculously high absolute
 36  * upper limit on files-per-process.
 37  *
 38  * Some programs (notably those using select()) may have to be 
 39  * recompiled to take full advantage of the new limits..  
 40  */
 41 
 42 /* Fixed constants first: */
 43 #undef NR_OPEN
 44 #define NR_OPEN (1024*1024)     /* Absolute upper limit on fd num */
 45 #define INR_OPEN 1024           /* Initial setting for nfile rlimits */
 46 
 47 #define BLOCK_SIZE_BITS 10
 48 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
 49 
 50 /* And dynamically-tunable limits and defaults: */
 51 struct files_stat_struct {
 52         int nr_files;           /* read only */
 53         int nr_free_files;      /* read only */
 54         int max_files;          /* tunable */
 55 };
 56 extern struct files_stat_struct files_stat;
 57 
 58 struct inodes_stat_t {
 59         int nr_inodes;
 60         int nr_unused;
 61         int dummy[5];
 62 };
 63 extern struct inodes_stat_t inodes_stat;
 64 
 65 extern int leases_enable, dir_notify_enable, lease_break_time;
 66 
 67 #define NR_FILE  8192   /* this can well be larger on a larger system */
 68 #define NR_RESERVED_FILES 10 /* reserved for root */
 69 #define NR_SUPER 256
 70 
 71 #define MAY_EXEC 1
 72 #define MAY_WRITE 2
 73 #define MAY_READ 4
 74 #define MAY_APPEND 8
 75 
 76 #define FMODE_READ 1
 77 #define FMODE_WRITE 2
 78 
 79 #define RW_MASK         1
 80 #define RWA_MASK        2
 81 #define READ 0
 82 #define WRITE 1
 83 #define READA 2         /* read-ahead  - don't block if no resources */
 84 #define SPECIAL 4       /* For non-blockdevice requests in request queue */
 85 
 86 #define SEL_IN          1
 87 #define SEL_OUT         2
 88 #define SEL_EX          4
 89 
 90 /* public flags for file_system_type */
 91 #define FS_REQUIRES_DEV 1 
 92 #define FS_REVAL_DOT    16384   /* Check the paths ".", ".." for staleness */
 93 #define FS_ODD_RENAME   32768   /* Temporary stuff; will go away as soon
 94                                   * as nfs_rename() will be cleaned up
 95                                   */
 96 /*
 97  * These are the fs-independent mount-flags: up to 32 flags are supported
 98  */
 99 #define MS_RDONLY        1      /* Mount read-only */
100 #define MS_NOSUID        2      /* Ignore suid and sgid bits */
101 #define MS_NODEV         4      /* Disallow access to device special files */
102 #define MS_NOEXEC        8      /* Disallow program execution */
103 #define MS_SYNCHRONOUS  16      /* Writes are synced at once */
104 #define MS_REMOUNT      32      /* Alter flags of a mounted FS */
105 #define MS_MANDLOCK     64      /* Allow mandatory locks on an FS */
106 #define MS_DIRSYNC      128     /* Directory modifications are synchronous */
107 #define MS_NOATIME      1024    /* Do not update access times. */
108 #define MS_NODIRATIME   2048    /* Do not update directory access times */
109 #define MS_BIND         4096
110 #define MS_MOVE         8192
111 #define MS_REC          16384
112 #define MS_VERBOSE      32768
113 #define MS_POSIXACL     (1<<16) /* VFS does not apply the umask */
114 #define MS_ONE_SECOND   (1<<17) /* fs has 1 sec a/m/ctime resolution */
115 #define MS_ACTIVE       (1<<30)
116 #define MS_NOUSER       (1<<31)
117 
118 /*
119  * Superblock flags that can be altered by MS_REMOUNT
120  */
121 #define MS_RMT_MASK     (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\
122                          MS_NODIRATIME)
123 
124 /*
125  * Old magic mount flag and mask
126  */
127 #define MS_MGC_VAL 0xC0ED0000
128 #define MS_MGC_MSK 0xffff0000
129 
130 /* Inode flags - they have nothing to superblock flags now */
131 
132 #define S_SYNC          1       /* Writes are synced at once */
133 #define S_NOATIME       2       /* Do not update access times */
134 #define S_QUOTA         4       /* Quota initialized for file */
135 #define S_APPEND        8       /* Append-only file */
136 #define S_IMMUTABLE     16      /* Immutable file */
137 #define S_DEAD          32      /* removed, but still open directory */
138 #define S_NOQUOTA       64      /* Inode is not counted to quota */
139 #define S_DIRSYNC       128     /* Directory modifications are synchronous */
140 
141 /*
142  * Note that nosuid etc flags are inode-specific: setting some file-system
143  * flags just means all the inodes inherit those flags by default. It might be
144  * possible to override it selectively if you really wanted to with some
145  * ioctl() that is not currently implemented.
146  *
147  * Exception: MS_RDONLY is always applied to the entire file system.
148  *
149  * Unfortunately, it is possible to change a filesystems flags with it mounted
150  * with files in use.  This means that all of the inodes will not have their
151  * i_flags updated.  Hence, i_flags no longer inherit the superblock mount
152  * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
153  */
154 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
155 
156 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
157 #define IS_SYNC(inode)          (__IS_FLG(inode, MS_SYNCHRONOUS) || \
158                                         ((inode)->i_flags & S_SYNC))
159 #define IS_DIRSYNC(inode)       (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
160                                         ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
161 #define IS_MANDLOCK(inode)      __IS_FLG(inode, MS_MANDLOCK)
162 
163 #define IS_QUOTAINIT(inode)     ((inode)->i_flags & S_QUOTA)
164 #define IS_NOQUOTA(inode)       ((inode)->i_flags & S_NOQUOTA)
165 #define IS_APPEND(inode)        ((inode)->i_flags & S_APPEND)
166 #define IS_IMMUTABLE(inode)     ((inode)->i_flags & S_IMMUTABLE)
167 #define IS_NOATIME(inode)       (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
168 #define IS_NODIRATIME(inode)    __IS_FLG(inode, MS_NODIRATIME)
169 #define IS_POSIXACL(inode)      __IS_FLG(inode, MS_POSIXACL)
170 #define IS_ONE_SECOND(inode)    __IS_FLG(inode, MS_ONE_SECOND)
171 
172 #define IS_DEADDIR(inode)       ((inode)->i_flags & S_DEAD)
173 
174 /* the read-only stuff doesn't really belong here, but any other place is
175    probably as bad and I don't want to create yet another include file. */
176 
177 #define BLKROSET   _IO(0x12,93) /* set device read-only (0 = read-write) */
178 #define BLKROGET   _IO(0x12,94) /* get read-only status (0 = read_write) */
179 #define BLKRRPART  _IO(0x12,95) /* re-read partition table */
180 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
181 #define BLKFLSBUF  _IO(0x12,97) /* flush buffer cache */
182 #define BLKRASET   _IO(0x12,98) /* set read ahead for block device */
183 #define BLKRAGET   _IO(0x12,99) /* get current read ahead setting */
184 #define BLKFRASET  _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
185 #define BLKFRAGET  _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
186 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
187 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
188 #define BLKSSZGET  _IO(0x12,104)/* get block device sector size */
189 #if 0
190 #define BLKPG      _IO(0x12,105)/* See blkpg.h */
191 
192 /* Some people are morons.  Do not use sizeof! */
193 
194 #define BLKELVGET  _IOR(0x12,106,size_t)/* elevator get */
195 #define BLKELVSET  _IOW(0x12,107,size_t)/* elevator set */
196 /* This was here just to show that the number is taken -
197    probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
198 #endif
199 /* A jump here: 108-111 have been used for various private purposes. */
200 #define BLKBSZGET  _IOR(0x12,112,size_t)
201 #define BLKBSZSET  _IOW(0x12,113,size_t)
202 #define BLKGETSIZE64 _IOR(0x12,114,size_t)      /* return device size in bytes (u64 *arg) */
203 
204 #define BMAP_IOCTL 1            /* obsolete - kept for compatibility */
205 #define FIBMAP     _IO(0x00,1)  /* bmap access */
206 #define FIGETBSZ   _IO(0x00,2)  /* get the block size used for bmap */
207 
208 #ifdef __KERNEL__
209 
210 #include <asm/semaphore.h>
211 #include <asm/byteorder.h>
212 
213 /* Used to be a macro which just called the function, now just a function */
214 extern void update_atime (struct inode *);
215 
216 extern void inode_init(unsigned long);
217 extern void mnt_init(unsigned long);
218 extern void files_init(unsigned long);
219 
220 struct buffer_head;
221 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
222                         struct buffer_head *bh_result, int create);
223 typedef int (get_blocks_t)(struct inode *inode, sector_t iblock,
224                         unsigned long max_blocks,
225                         struct buffer_head *bh_result, int create);
226 typedef void (dio_iodone_t)(struct inode *inode, loff_t offset,
227                         ssize_t bytes, void *private);
228 
229 /*
230  * Attribute flags.  These should be or-ed together to figure out what
231  * has been changed!
232  */
233 #define ATTR_MODE       1
234 #define ATTR_UID        2
235 #define ATTR_GID        4
236 #define ATTR_SIZE       8
237 #define ATTR_ATIME      16
238 #define ATTR_MTIME      32
239 #define ATTR_CTIME      64
240 #define ATTR_ATIME_SET  128
241 #define ATTR_MTIME_SET  256
242 #define ATTR_FORCE      512     /* Not a change, but a change it */
243 #define ATTR_ATTR_FLAG  1024
244 #define ATTR_KILL_SUID  2048
245 #define ATTR_KILL_SGID  4096
246 
247 /*
248  * This is the Inode Attributes structure, used for notify_change().  It
249  * uses the above definitions as flags, to know which values have changed.
250  * Also, in this manner, a Filesystem can look at only the values it cares
251  * about.  Basically, these are the attributes that the VFS layer can
252  * request to change from the FS layer.
253  *
254  * Derek Atkins <warlord@MIT.EDU> 94-10-20
255  */
256 struct iattr {
257         unsigned int    ia_valid;
258         umode_t         ia_mode;
259         uid_t           ia_uid;
260         gid_t           ia_gid;
261         loff_t          ia_size;
262         struct timespec ia_atime;
263         struct timespec ia_mtime;
264         struct timespec ia_ctime;
265         unsigned int    ia_attr_flags;
266 };
267 
268 /*
269  * This is the inode attributes flag definitions
270  */
271 #define ATTR_FLAG_SYNCRONOUS    1       /* Syncronous write */
272 #define ATTR_FLAG_NOATIME       2       /* Don't update atime */
273 #define ATTR_FLAG_APPEND        4       /* Append-only file */
274 #define ATTR_FLAG_IMMUTABLE     8       /* Immutable file */
275 #define ATTR_FLAG_NODIRATIME    16      /* Don't update atime for directory */
276 
277 /*
278  * Includes for diskquotas.
279  */
280 #include <linux/quota.h>
281 
282 /*
283  * oh the beauties of C type declarations.
284  */
285 struct page;
286 struct address_space;
287 struct writeback_control;
288 struct kiocb;
289 
290 struct address_space_operations {
291         int (*writepage)(struct page *page, struct writeback_control *wbc);
292         int (*readpage)(struct file *, struct page *);
293         int (*sync_page)(struct page *);
294 
295         /* Write back some dirty pages from this mapping. */
296         int (*writepages)(struct address_space *, struct writeback_control *);
297 
298         /* Set a page dirty */
299         int (*set_page_dirty)(struct page *page);
300 
301         int (*readpages)(struct file *filp, struct address_space *mapping,
302                         struct list_head *pages, unsigned nr_pages);
303 
304         /*
305          * ext3 requires that a successful prepare_write() call be followed
306          * by a commit_write() call - they must be balanced
307          */
308         int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
309         int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
310         /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
311         sector_t (*bmap)(struct address_space *, sector_t);
312         int (*invalidatepage) (struct page *, unsigned long);
313         int (*releasepage) (struct page *, int);
314         int (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
315                         loff_t offset, unsigned long nr_segs);
316 };
317 
318 struct backing_dev_info;
319 struct address_space {
320         struct inode            *host;          /* owner: inode, block_device */
321         struct radix_tree_root  page_tree;      /* radix tree of all pages */
322         spinlock_t              page_lock;      /* and spinlock protecting it */
323         struct list_head        clean_pages;    /* list of clean pages */
324         struct list_head        dirty_pages;    /* list of dirty pages */
325         struct list_head        locked_pages;   /* list of locked pages */
326         struct list_head        io_pages;       /* being prepared for I/O */
327         unsigned long           nrpages;        /* number of total pages */
328         struct address_space_operations *a_ops; /* methods */
329         struct list_head        i_mmap;         /* list of private mappings */
330         struct list_head        i_mmap_shared;  /* list of shared mappings */
331         struct semaphore        i_shared_sem;   /* protect both above lists */
332         atomic_t                truncate_count; /* Cover race condition with truncate */
333         unsigned long           dirtied_when;   /* jiffies of first page dirtying */
334         unsigned long           flags;          /* error bits/gfp mask */
335         struct backing_dev_info *backing_dev_info; /* device readahead, etc */
336         spinlock_t              private_lock;   /* for use by the address_space */
337         struct list_head        private_list;   /* ditto */
338         struct address_space    *assoc_mapping; /* ditto */
339 };
340 
341 struct block_device {
342         dev_t                   bd_dev;  /* not a kdev_t - it's a search key */
343         struct inode *          bd_inode;       /* will die */
344         int                     bd_openers;
345         struct semaphore        bd_sem; /* open/close mutex */
346         struct list_head        bd_inodes;
347         void *                  bd_holder;
348         int                     bd_holders;
349         struct block_device *   bd_contains;
350         unsigned                bd_block_size;
351         struct hd_struct *      bd_part;
352         unsigned                bd_part_count;
353         int                     bd_invalidated;
354         struct gendisk *        bd_disk;
355         struct list_head        bd_list;
356 };
357 
358 /*
359  * Use sequence counter to get consistent i_size on 32-bit processors.
360  */
361 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
362 #include <linux/seqlock.h>
363 #define __NEED_I_SIZE_ORDERED
364 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
365 #else
366 #define i_size_ordered_init(inode) do { } while (0)
367 #endif
368 
369 struct inode {
370         struct hlist_node       i_hash;
371         struct list_head        i_list;
372         struct list_head        i_dentry;
373         unsigned long           i_ino;
374         atomic_t                i_count;
375         umode_t                 i_mode;
376         unsigned int            i_nlink;
377         uid_t                   i_uid;
378         gid_t                   i_gid;
379         dev_t                   i_rdev;
380         loff_t                  i_size;
381         struct timespec         i_atime;
382         struct timespec         i_mtime;
383         struct timespec         i_ctime;
384         unsigned int            i_blkbits;
385         unsigned long           i_blksize;
386         unsigned long           i_version;
387         unsigned long           i_blocks;
388         unsigned short          i_bytes;
389         spinlock_t              i_lock; /* i_blocks, i_bytes, maybe i_size */
390         struct semaphore        i_sem;
391         struct inode_operations *i_op;
392         struct file_operations  *i_fop; /* former ->i_op->default_file_ops */
393         struct super_block      *i_sb;
394         struct file_lock        *i_flock;
395         struct address_space    *i_mapping;
396         struct address_space    i_data;
397         struct dquot            *i_dquot[MAXQUOTAS];
398         /* These three should probably be a union */
399         struct list_head        i_devices;
400         struct pipe_inode_info  *i_pipe;
401         struct block_device     *i_bdev;
402         struct cdev             *i_cdev;
403         int                     i_cindex;
404 
405         unsigned long           i_dnotify_mask; /* Directory notify events */
406         struct dnotify_struct   *i_dnotify; /* for directory notifications */
407 
408         unsigned long           i_state;
409 
410         unsigned int            i_flags;
411         unsigned char           i_sock;
412 
413         atomic_t                i_writecount;
414         void                    *i_security;
415         __u32                   i_generation;
416         union {
417                 void            *generic_ip;
418         } u;
419 #ifdef __NEED_I_SIZE_ORDERED
420         seqcount_t              i_size_seqcount;
421 #endif
422 };
423 
424 /*
425  * NOTE: in a 32bit arch with a preemptable kernel and
426  * an UP compile the i_size_read/write must be atomic
427  * with respect to the local cpu (unlike with preempt disabled),
428  * but they don't need to be atomic with respect to other cpus like in
429  * true SMP (so they need either to either locally disable irq around
430  * the read or for example on x86 they can be still implemented as a
431  * cmpxchg8b without the need of the lock prefix). For SMP compiles
432  * and 64bit archs it makes no difference if preempt is enabled or not.
433  */
434 static inline loff_t i_size_read(struct inode *inode)
435 {
436 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
437         loff_t i_size;
438         unsigned int seq;
439 
440         do {
441                 seq = read_seqcount_begin(&inode->i_size_seqcount);
442                 i_size = inode->i_size;
443         } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
444         return i_size;
445 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
446         loff_t i_size;
447 
448         preempt_disable();
449         i_size = inode->i_size;
450         preempt_enable();
451         return i_size;
452 #else
453         return inode->i_size;
454 #endif
455 }
456 
457 
458 static inline void i_size_write(struct inode *inode, loff_t i_size)
459 {
460 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
461         write_seqcount_begin(&inode->i_size_seqcount);
462         inode->i_size = i_size;
463         write_seqcount_end(&inode->i_size_seqcount);
464 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
465         preempt_disable();
466         inode->i_size = i_size;
467         preempt_enable();
468 #else
469         inode->i_size = i_size;
470 #endif
471 }
472 
473 static inline unsigned iminor(struct inode *inode)
474 {
475         return MINOR(inode->i_rdev);
476 }
477 
478 static inline unsigned imajor(struct inode *inode)
479 {
480         return MAJOR(inode->i_rdev);
481 }
482 
483 struct fown_struct {
484         rwlock_t lock;          /* protects pid, uid, euid fields */
485         int pid;                /* pid or -pgrp where SIGIO should be sent */
486         uid_t uid, euid;        /* uid/euid of process setting the owner */
487         int signum;             /* posix.1b rt signal to be delivered on IO */
488         void *security;
489 };
490 
491 /*
492  * Track a single file's readahead state
493  */
494 struct file_ra_state {
495         unsigned long start;            /* Current window */
496         unsigned long size;
497         unsigned long next_size;        /* Next window size */
498         unsigned long prev_page;        /* Cache last read() position */
499         unsigned long ahead_start;      /* Ahead window */
500         unsigned long ahead_size;
501         unsigned long ra_pages;         /* Maximum readahead window */
502         unsigned long mmap_hit;         /* Cache hit stat for mmap accesses */
503         unsigned long mmap_miss;        /* Cache miss stat for mmap accesses */
504 };
505 
506 struct file {
507         struct list_head        f_list;
508         struct dentry           *f_dentry;
509         struct vfsmount         *f_vfsmnt;
510         struct file_operations  *f_op;
511         atomic_t                f_count;
512         unsigned int            f_flags;
513         mode_t                  f_mode;
514         loff_t                  f_pos;
515         struct fown_struct      f_owner;
516         unsigned int            f_uid, f_gid;
517         int                     f_error;
518         struct file_ra_state    f_ra;
519 
520         unsigned long           f_version;
521         void                    *f_security;
522 
523         /* needed for tty driver, and maybe others */
524         void                    *private_data;
525 
526         /* Used by fs/eventpoll.c to link all the hooks to this file */
527         struct list_head        f_ep_links;
528         spinlock_t              f_ep_lock;
529 };
530 extern spinlock_t files_lock;
531 #define file_list_lock() spin_lock(&files_lock);
532 #define file_list_unlock() spin_unlock(&files_lock);
533 
534 #define get_file(x)     atomic_inc(&(x)->f_count)
535 #define file_count(x)   atomic_read(&(x)->f_count)
536 
537 /* Initialize and open a private file and allocate its security structure. */
538 extern int open_private_file(struct file *, struct dentry *, int);
539 /* Release a private file and free its security structure. */
540 extern void close_private_file(struct file *file);
541 
542 #define MAX_NON_LFS     ((1UL<<31) - 1)
543 
544 /* Page cache limit. The filesystems should put that into their s_maxbytes 
545    limits, otherwise bad things can happen in VM. */ 
546 #if BITS_PER_LONG==32
547 #define MAX_LFS_FILESIZE        (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 
548 #elif BITS_PER_LONG==64
549 #define MAX_LFS_FILESIZE        0x7fffffffffffffff
550 #endif
551 
552 #define FL_POSIX        1
553 #define FL_FLOCK        2
554 #define FL_ACCESS       8       /* not trying to lock, just looking */
555 #define FL_LOCKD        16      /* lock held by rpc.lockd */
556 #define FL_LEASE        32      /* lease held on this file */
557 #define FL_SLEEP        128     /* A blocking lock */
558 
559 /*
560  * The POSIX file lock owner is determined by
561  * the "struct files_struct" in the thread group
562  * (or NULL for no owner - BSD locks).
563  *
564  * Lockd stuffs a "host" pointer into this.
565  */
566 typedef struct files_struct *fl_owner_t;
567 
568 /* that will die - we need it for nfs_lock_info */
569 #include <linux/nfs_fs_i.h>
570 
571 struct file_lock {
572         struct file_lock *fl_next;      /* singly linked list for this inode  */
573         struct list_head fl_link;       /* doubly linked list of all locks */
574         struct list_head fl_block;      /* circular list of blocked processes */
575         fl_owner_t fl_owner;
576         unsigned int fl_pid;
577         wait_queue_head_t fl_wait;
578         struct file *fl_file;
579         unsigned char fl_flags;
580         unsigned char fl_type;
581         loff_t fl_start;
582         loff_t fl_end;
583 
584         void (*fl_notify)(struct file_lock *);  /* unblock callback */
585         void (*fl_insert)(struct file_lock *);  /* lock insertion callback */
586         void (*fl_remove)(struct file_lock *);  /* lock removal callback */
587 
588         struct fasync_struct *  fl_fasync; /* for lease break notifications */
589         unsigned long fl_break_time;    /* for nonblocking lease breaks */
590 
591         union {
592                 struct nfs_lock_info    nfs_fl;
593         } fl_u;
594 };
595 
596 /* The following constant reflects the upper bound of the file/locking space */
597 #ifndef OFFSET_MAX
598 #define INT_LIMIT(x)    (~((x)1 << (sizeof(x)*8 - 1)))
599 #define OFFSET_MAX      INT_LIMIT(loff_t)
600 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
601 #endif
602 
603 extern struct list_head file_lock_list;
604 
605 #include <linux/fcntl.h>
606 
607 extern int fcntl_getlk(struct file *, struct flock __user *);
608 extern int fcntl_setlk(struct file *, unsigned int, struct flock __user *);
609 
610 #if BITS_PER_LONG == 32
611 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
612 extern int fcntl_setlk64(struct file *, unsigned int, struct flock64 __user *);
613 #endif
614 
615 extern void send_sigio(struct fown_struct *fown, int fd, int band);
616 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
617 extern int fcntl_getlease(struct file *filp);
618 
619 /* fs/locks.c */
620 extern void locks_init_lock(struct file_lock *);
621 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
622 extern void locks_remove_posix(struct file *, fl_owner_t);
623 extern void locks_remove_flock(struct file *);
624 extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
625 extern int posix_lock_file(struct file *, struct file_lock *);
626 extern void posix_block_lock(struct file_lock *, struct file_lock *);
627 extern void posix_unblock_lock(struct file *, struct file_lock *);
628 extern int posix_locks_deadlock(struct file_lock *, struct file_lock *);
629 extern int __break_lease(struct inode *inode, unsigned int flags);
630 extern void lease_get_mtime(struct inode *, struct timespec *time);
631 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
632 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
633 
634 struct fasync_struct {
635         int     magic;
636         int     fa_fd;
637         struct  fasync_struct   *fa_next; /* singly linked list */
638         struct  file            *fa_file;
639 };
640 
641 #define FASYNC_MAGIC 0x4601
642 
643 /* SMP safe fasync helpers: */
644 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
645 /* can be called from interrupts */
646 extern void kill_fasync(struct fasync_struct **, int, int);
647 /* only for net: no internal synchronization */
648 extern void __kill_fasync(struct fasync_struct *, int, int);
649 
650 extern int f_setown(struct file *filp, unsigned long arg, int force);
651 extern void f_delown(struct file *filp);
652 extern int send_sigurg(struct fown_struct *fown);
653 
654 /*
655  *      Umount options
656  */
657 
658 #define MNT_FORCE       0x00000001      /* Attempt to forcibily umount */
659 #define MNT_DETACH      0x00000002      /* Just detach from the tree */
660 
661 extern struct list_head super_blocks;
662 extern spinlock_t sb_lock;
663 
664 #define sb_entry(list)  list_entry((list), struct super_block, s_list)
665 #define S_BIAS (1<<30)
666 struct super_block {
667         struct list_head        s_list;         /* Keep this first */
668         dev_t                   s_dev;          /* search index; _not_ kdev_t */
669         unsigned long           s_blocksize;
670         unsigned long           s_old_blocksize;
671         unsigned char           s_blocksize_bits;
672         unsigned char           s_dirt;
673         unsigned long long      s_maxbytes;     /* Max file size */
674         struct file_system_type *s_type;
675         struct super_operations *s_op;
676         struct dquot_operations *dq_op;
677         struct quotactl_ops     *s_qcop;
678         struct export_operations *s_export_op;
679         unsigned long           s_flags;
680         unsigned long           s_magic;
681         struct dentry           *s_root;
682         struct rw_semaphore     s_umount;
683         struct semaphore        s_lock;
684         int                     s_count;
685         int                     s_syncing;
686         int                     s_need_sync_fs;
687         atomic_t                s_active;
688         void                    *s_security;
689 
690         struct list_head        s_dirty;        /* dirty inodes */
691         struct list_head        s_io;           /* parked for writeback */
692         struct hlist_head       s_anon;         /* anonymous dentries for (nfs) exporting */
693         struct list_head        s_files;
694 
695         struct block_device     *s_bdev;
696         struct list_head        s_instances;
697         struct quota_info       s_dquot;        /* Diskquota specific options */
698 
699         char s_id[32];                          /* Informational name */
700 
701         struct kobject           kobj;          /* anchor for sysfs */
702         void                    *s_fs_info;     /* Filesystem private info */
703 
704         /*
705          * The next field is for VFS *only*. No filesystems have any business
706          * even looking at it. You had been warned.
707          */
708         struct semaphore s_vfs_rename_sem;      /* Kludge */
709 };
710 
711 /*
712  * Superblock locking.
713  */
714 static inline void lock_super(struct super_block * sb)
715 {
716         down(&sb->s_lock);
717 }
718 
719 static inline void unlock_super(struct super_block * sb)
720 {
721         up(&sb->s_lock);
722 }
723 
724 /*
725  * VFS helper functions..
726  */
727 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
728 extern int vfs_mkdir(struct inode *, struct dentry *, int);
729 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
730 extern int vfs_symlink(struct inode *, struct dentry *, const char *);
731 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
732 extern int vfs_rmdir(struct inode *, struct dentry *);
733 extern int vfs_unlink(struct inode *, struct dentry *);
734 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
735 
736 /*
737  * File types
738  *
739  * NOTE! These match bits 12..15 of stat.st_mode
740  * (ie "(i_mode >> 12) & 15").
741  */
742 #define DT_UNKNOWN      0
743 #define DT_FIFO         1
744 #define DT_CHR          2
745 #define DT_DIR          4
746 #define DT_BLK          6
747 #define DT_REG          8
748 #define DT_LNK          10
749 #define DT_SOCK         12
750 #define DT_WHT          14
751 
752 /*
753  * This is the "filldir" function type, used by readdir() to let
754  * the kernel specify what kind of dirent layout it wants to have.
755  * This allows the kernel to read directories into kernel space or
756  * to have different dirent layouts depending on the binary type.
757  */
758 typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned);
759 
760 struct block_device_operations {
761         int (*open) (struct inode *, struct file *);
762         int (*release) (struct inode *, struct file *);
763         int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
764         int (*media_changed) (struct gendisk *);
765         int (*revalidate_disk) (struct gendisk *);
766         struct module *owner;
767 };
768 
769 /*
770  * "descriptor" for what we're up to with a read for sendfile().
771  * This allows us to use the same read code yet
772  * have multiple different users of the data that
773  * we read from a file.
774  *
775  * The simplest case just copies the data to user
776  * mode.
777  */
778 typedef struct {
779         size_t written;
780         size_t count;
781         char __user * buf;
782         int error;
783 } read_descriptor_t;
784 
785 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
786 
787 /*
788  * NOTE:
789  * read, write, poll, fsync, readv, writev can be called
790  *   without the big kernel lock held in all filesystems.
791  */
792 struct file_operations {
793         struct module *owner;
794         loff_t (*llseek) (struct file *, loff_t, int);
795         ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
796         ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
797         ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
798         ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);
799         int (*readdir) (struct file *, void *, filldir_t);
800         unsigned int (*poll) (struct file *, struct poll_table_struct *);
801         int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
802         int (*mmap) (struct file *, struct vm_area_struct *);
803         int (*open) (struct inode *, struct file *);
804         int (*flush) (struct file *);
805         int (*release) (struct inode *, struct file *);
806         int (*fsync) (struct file *, struct dentry *, int datasync);
807         int (*aio_fsync) (struct kiocb *, int datasync);
808         int (*fasync) (int, struct file *, int);
809         int (*lock) (struct file *, int, struct file_lock *);
810         ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
811         ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
812         ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void __user *);
813         ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
814         unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
815 };
816 
817 struct inode_operations {
818         int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
819         struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
820         int (*link) (struct dentry *,struct inode *,struct dentry *);
821         int (*unlink) (struct inode *,struct dentry *);
822         int (*symlink) (struct inode *,struct dentry *,const char *);
823         int (*mkdir) (struct inode *,struct dentry *,int);
824         int (*rmdir) (struct inode *,struct dentry *);
825         int (*mknod) (struct inode *,struct dentry *,int,dev_t);
826         int (*rename) (struct inode *, struct dentry *,
827                         struct inode *, struct dentry *);
828         int (*readlink) (struct dentry *, char __user *,int);
829         int (*follow_link) (struct dentry *, struct nameidata *);
830         void (*truncate) (struct inode *);
831         int (*permission) (struct inode *, int, struct nameidata *);
832         int (*setattr) (struct dentry *, struct iattr *);
833         int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
834         int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
835         ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
836         ssize_t (*listxattr) (struct dentry *, char *, size_t);
837         int (*removexattr) (struct dentry *, const char *);
838 };
839 
840 struct seq_file;
841 
842 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
843 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
844 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
845                 unsigned long, loff_t *);
846 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
847                 unsigned long, loff_t *);
848 
849 /*
850  * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
851  * without the big kernel lock held in all filesystems.
852  */
853 struct super_operations {
854         struct inode *(*alloc_inode)(struct super_block *sb);
855         void (*destroy_inode)(struct inode *);
856 
857         void (*read_inode) (struct inode *);
858   
859         void (*dirty_inode) (struct inode *);
860         void (*write_inode) (struct inode *, int);
861         void (*put_inode) (struct inode *);
862         void (*drop_inode) (struct inode *);
863         void (*delete_inode) (struct inode *);
864         void (*put_super) (struct super_block *);
865         void (*write_super) (struct super_block *);
866         int (*sync_fs)(struct super_block *sb, int wait);
867         void (*write_super_lockfs) (struct super_block *);
868         void (*unlockfs) (struct super_block *);
869         int (*statfs) (struct super_block *, struct kstatfs *);
870         int (*remount_fs) (struct super_block *, int *, char *);
871         void (*clear_inode) (struct inode *);
872         void (*umount_begin) (struct super_block *);
873 
874         int (*show_options)(struct seq_file *, struct vfsmount *);
875 };
876 
877 /* Inode state bits.  Protected by inode_lock. */
878 #define I_DIRTY_SYNC            1 /* Not dirty enough for O_DATASYNC */
879 #define I_DIRTY_DATASYNC        2 /* Data-related inode changes pending */
880 #define I_DIRTY_PAGES           4 /* Data-related inode changes pending */
881 #define I_LOCK                  8
882 #define I_FREEING               16
883 #define I_CLEAR                 32
884 #define I_NEW                   64
885 
886 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
887 
888 extern void __mark_inode_dirty(struct inode *, int);
889 static inline void mark_inode_dirty(struct inode *inode)
890 {
891         __mark_inode_dirty(inode, I_DIRTY);
892 }
893 
894 static inline void mark_inode_dirty_sync(struct inode *inode)
895 {
896         __mark_inode_dirty(inode, I_DIRTY_SYNC);
897 }
898 
899 
900 /**
901  * &export_operations - for nfsd to communicate with file systems
902  * decode_fh:      decode a file handle fragment and return a &struct dentry
903  * encode_fh:      encode a file handle fragment from a dentry
904  * get_name:       find the name for a given inode in a given directory
905  * get_parent:     find the parent of a given directory
906  * get_dentry:     find a dentry for the inode given a file handle sub-fragment
907  *
908  * Description:
909  *    The export_operations structure provides a means for nfsd to communicate
910  *    with a particular exported file system  - particularly enabling nfsd and
911  *    the filesystem to co-operate when dealing with file handles.
912  *
913  *    export_operations contains two basic operation for dealing with file handles,
914  *    decode_fh() and encode_fh(), and allows for some other operations to be defined
915  *    which standard helper routines use to get specific information from the
916  *    filesystem.
917  *
918  *    nfsd encodes information use to determine which filesystem a filehandle
919  *    applies to in the initial part of the file handle.  The remainder, termed a
920  *    file handle fragment, is controlled completely by the filesystem.
921  *    The standard helper routines assume that this fragment will contain one or two
922  *    sub-fragments, one which identifies the file, and one which may be used to
923  *    identify the (a) directory containing the file.
924  *
925  *    In some situations, nfsd needs to get a dentry which is connected into a
926  *    specific part of the file tree.  To allow for this, it passes the function
927  *    acceptable() together with a @context which can be used to see if the dentry
928  *    is acceptable.  As there can be multiple dentrys for a given file, the filesystem
929  *    should check each one for acceptability before looking for the next.  As soon
930  *    as an acceptable one is found, it should be returned.
931  *
932  * decode_fh:
933  *    @decode_fh is given a &struct super_block (@sb), a file handle fragment (@fh, @fh_len)
934  *    and an acceptability testing function (@acceptable, @context).  It should return
935  *    a &struct dentry which refers to the same file that the file handle fragment refers
936  *    to,  and which passes the acceptability test.  If it cannot, it should return
937  *    a %NULL pointer if the file was found but no acceptable &dentries were available, or
938  *    a %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or %ENOMEM).
939  *
940  * encode_fh:
941  *    @encode_fh should store in the file handle fragment @fh (using at most @max_len bytes)
942  *    information that can be used by @decode_fh to recover the file refered to by the
943  *    &struct dentry @de.  If the @connectable flag is set, the encode_fh() should store
944  *    sufficient information so that a good attempt can be made to find not only
945  *    the file but also it's place in the filesystem.   This typically means storing
946  *    a reference to de->d_parent in the filehandle fragment.
947  *    encode_fh() should return the number of bytes stored or a negative error code
948  *    such as %-ENOSPC
949  *
950  * get_name:
951  *    @get_name should find a name for the given @child in the given @parent directory.
952  *    The name should be stored in the @name (with the understanding that it is already
953  *    pointing to a a %NAME_MAX+1 sized buffer.   get_name() should return %0 on success,
954  *    a negative error code or error.
955  *    @get_name will be called without @parent->i_sem held.
956  *
957  * get_parent:
958  *    @get_parent should find the parent directory for the given @child which is also
959  *    a directory.  In the event that it cannot be found, or storage space cannot be
960  *    allocated, a %ERR_PTR should be returned.
961  *
962  * get_dentry:
963  *    Given a &super_block (@sb) and a pointer to a file-system specific inode identifier,
964  *    possibly an inode number, (@inump) get_dentry() should find the identified inode and
965  *    return a dentry for that inode.
966  *    Any suitable dentry can be returned including, if necessary, a new dentry created
967  *    with d_alloc_root.  The caller can then find any other extant dentrys by following the
968  *    d_alias links.  If a new dentry was created using d_alloc_root, DCACHE_NFSD_DISCONNECTED
969  *    should be set, and the dentry should be d_rehash()ed.
970  *
971  *    If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code can be returned.
972  *    The @inump will be whatever was passed to nfsd_find_fh_dentry() in either the
973  *    @obj or @parent parameters.
974  *
975  * Locking rules:
976  *  get_parent is called with child->d_inode->i_sem down
977  *  get_name is not (which is possibly inconsistent)
978  */
979 
980 struct export_operations {
981         struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
982                          int (*acceptable)(void *context, struct dentry *de),
983                          void *context);
984         int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
985                          int connectable);
986 
987         /* the following are only called from the filesystem itself */
988         int (*get_name)(struct dentry *parent, char *name,
989                         struct dentry *child);
990         struct dentry * (*get_parent)(struct dentry *child);
991         struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
992 
993         /* This is set by the exporting module to a standard helper */
994         struct dentry * (*find_exported_dentry)(
995                 struct super_block *sb, void *obj, void *parent,
996                 int (*acceptable)(void *context, struct dentry *de),
997                 void *context);
998 
999 
1000 };
1001 
1002 
1003 struct file_system_type {
1004         const char *name;
1005         int fs_flags;
1006         struct super_block *(*get_sb) (struct file_system_type *, int,
1007                                        const char *, void *);
1008         void (*kill_sb) (struct super_block *);
1009         struct module *owner;
1010         struct file_system_type * next;
1011         struct list_head fs_supers;
1012 };
1013 
1014 struct super_block *get_sb_bdev(struct file_system_type *fs_type,
1015         int flags, const char *dev_name, void *data,
1016         int (*fill_super)(struct super_block *, void *, int));
1017 struct super_block *get_sb_single(struct file_system_type *fs_type,
1018         int flags, void *data,
1019         int (*fill_super)(struct super_block *, void *, int));
1020 struct super_block *get_sb_nodev(struct file_system_type *fs_type,
1021         int flags, void *data,
1022         int (*fill_super)(struct super_block *, void *, int));
1023 void generic_shutdown_super(struct super_block *sb);
1024 void kill_block_super(struct super_block *sb);
1025 void kill_anon_super(struct super_block *sb);
1026 void kill_litter_super(struct super_block *sb);
1027 void deactivate_super(struct super_block *sb);
1028 int set_anon_super(struct super_block *s, void *data);
1029 struct super_block *sget(struct file_system_type *type,
1030                         int (*test)(struct super_block *,void *),
1031                         int (*set)(struct super_block *,void *),
1032                         void *data);
1033 struct super_block *get_sb_pseudo(struct file_system_type *, char *,
1034                         struct super_operations *ops, unsigned long);
1035 
1036 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1037 #define fops_get(fops) \
1038         (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1039 #define fops_put(fops) \
1040         do { if (fops) module_put((fops)->owner); } while(0)
1041 
1042 extern int register_filesystem(struct file_system_type *);
1043 extern int unregister_filesystem(struct file_system_type *);
1044 extern struct vfsmount *kern_mount(struct file_system_type *);
1045 extern int may_umount(struct vfsmount *);
1046 extern long do_mount(char *, char *, char *, unsigned long, void *);
1047 
1048 extern int vfs_statfs(struct super_block *, struct kstatfs *);
1049 
1050 /* Return value for VFS lock functions - tells locks.c to lock conventionally
1051  * REALLY kosha for root NFS and nfs_lock
1052  */ 
1053 #define LOCK_USE_CLNT 1
1054 
1055 #define FLOCK_VERIFY_READ  1
1056 #define FLOCK_VERIFY_WRITE 2
1057 
1058 extern int locks_mandatory_locked(struct inode *);
1059 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1060 
1061 /*
1062  * Candidates for mandatory locking have the setgid bit set
1063  * but no group execute bit -  an otherwise meaningless combination.
1064  */
1065 #define MANDATORY_LOCK(inode) \
1066         (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1067 
1068 static inline int locks_verify_locked(struct inode *inode)
1069 {
1070         if (MANDATORY_LOCK(inode))
1071                 return locks_mandatory_locked(inode);
1072         return 0;
1073 }
1074 
1075 static inline int locks_verify_area(int read_write, struct inode *inode,
1076                                     struct file *filp, loff_t offset,
1077                                     size_t count)
1078 {
1079         if (inode->i_flock && MANDATORY_LOCK(inode))
1080                 return locks_mandatory_area(read_write, inode, filp, offset, count);
1081         return 0;
1082 }
1083 
1084 static inline int locks_verify_truncate(struct inode *inode,
1085                                     struct file *filp,
1086                                     loff_t size)
1087 {
1088         if (inode->i_flock && MANDATORY_LOCK(inode))
1089                 return locks_mandatory_area(
1090                         FLOCK_VERIFY_WRITE, inode, filp,
1091                         size < inode->i_size ? size : inode->i_size,
1092                         (size < inode->i_size ? inode->i_size - size
1093                          : size - inode->i_size)
1094                 );
1095         return 0;
1096 }
1097 
1098 static inline int break_lease(struct inode *inode, unsigned int mode)
1099 {
1100         if (inode->i_flock)
1101                 return __break_lease(inode, mode);
1102         return 0;
1103 }
1104 
1105 /* fs/open.c */
1106 
1107 asmlinkage long sys_open(const char __user *, int, int);
1108 asmlinkage long sys_close(unsigned int);        /* yes, it's really unsigned */
1109 extern int do_truncate(struct dentry *, loff_t start);
1110 
1111 extern struct file *filp_open(const char *, int, int);
1112 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1113 extern int filp_close(struct file *, fl_owner_t id);
1114 extern char * getname(const char __user *);
1115 
1116 /* fs/dcache.c */
1117 extern void vfs_caches_init(unsigned long);
1118 
1119 #define __getname()     kmem_cache_alloc(names_cachep, SLAB_KERNEL)
1120 #define putname(name)   kmem_cache_free(names_cachep, (void *)(name))
1121 
1122 enum {BDEV_FILE, BDEV_SWAP, BDEV_FS, BDEV_RAW};
1123 extern int register_blkdev(unsigned int, const char *);
1124 extern int unregister_blkdev(unsigned int, const char *);
1125 extern struct block_device *bdget(dev_t);
1126 extern int bd_acquire(struct inode *inode);
1127 extern void bd_forget(struct inode *inode);
1128 extern void bdput(struct block_device *);
1129 extern int blkdev_open(struct inode *, struct file *);
1130 extern int blkdev_close(struct inode *, struct file *);
1131 extern struct block_device *open_by_devnum(dev_t, unsigned, int);
1132 extern struct file_operations def_blk_fops;
1133 extern struct address_space_operations def_blk_aops;
1134 extern struct file_operations def_chr_fops;
1135 extern struct file_operations bad_sock_fops;
1136 extern struct file_operations def_fifo_fops;
1137 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1138 extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
1139 extern int blkdev_get(struct block_device *, mode_t, unsigned, int);
1140 extern int blkdev_put(struct block_device *, int);
1141 extern int bd_claim(struct block_device *, void *);
1142 extern void bd_release(struct block_device *);
1143 extern void blk_run_queues(void);
1144 
1145 /* fs/char_dev.c */
1146 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, char *);
1147 extern int register_chrdev_region(dev_t, unsigned, char *);
1148 extern int register_chrdev(unsigned int, const char *,
1149                            struct file_operations *);
1150 extern int unregister_chrdev(unsigned int, const char *);
1151 extern void unregister_chrdev_region(dev_t, unsigned);
1152 extern int chrdev_open(struct inode *, struct file *);
1153 
1154 /* fs/block_dev.c */
1155 #define BDEVNAME_SIZE   32      /* Largest string for a blockdev identifier */
1156 extern const char *__bdevname(dev_t, char *buffer);
1157 extern const char *bdevname(struct block_device *bdev, char *buffer);
1158 extern struct block_device *lookup_bdev(const char *);
1159 extern struct block_device *open_bdev_excl(const char *, int, int, void *);
1160 extern void close_bdev_excl(struct block_device *, int);
1161 
1162 extern void init_special_inode(struct inode *, umode_t, dev_t);
1163 
1164 /* Invalid inode operations -- fs/bad_inode.c */
1165 extern void make_bad_inode(struct inode *);
1166 extern int is_bad_inode(struct inode *);
1167 
1168 extern struct file_operations read_fifo_fops;
1169 extern struct file_operations write_fifo_fops;
1170 extern struct file_operations rdwr_fifo_fops;
1171 extern struct file_operations read_pipe_fops;
1172 extern struct file_operations write_pipe_fops;
1173 extern struct file_operations rdwr_pipe_fops;
1174 
1175 extern int fs_may_remount_ro(struct super_block *);
1176 
1177 /*
1178  * return READ, READA, or WRITE
1179  */
1180 #define bio_rw(bio)             ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1181 
1182 /*
1183  * return data direction, READ or WRITE
1184  */
1185 #define bio_data_dir(bio)       ((bio)->bi_rw & 1)
1186 
1187 extern int check_disk_change(struct block_device *);
1188 extern int invalidate_inodes(struct super_block *);
1189 extern int __invalidate_device(struct block_device *, int);
1190 extern int invalidate_partition(struct gendisk *, int);
1191 unsigned long invalidate_mapping_pages(struct address_space *mapping,
1192                                         pgoff_t start, pgoff_t end);
1193 unsigned long invalidate_inode_pages(struct address_space *mapping);
1194 static inline void invalidate_remote_inode(struct inode *inode)
1195 {
1196         if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1197             S_ISLNK(inode->i_mode))
1198                 invalidate_inode_pages(inode->i_mapping);
1199 }
1200 extern void invalidate_inode_pages2(struct address_space *mapping);
1201 extern void write_inode_now(struct inode *, int);
1202 extern int filemap_fdatawrite(struct address_space *);
1203 extern int filemap_flush(struct address_space *);
1204 extern int filemap_fdatawait(struct address_space *);
1205 extern void sync_supers(void);
1206 extern void sync_filesystems(int wait);
1207 extern void emergency_sync(void);
1208 extern void emergency_remount(void);
1209 extern int do_remount_sb(struct super_block *sb, int flags,
1210                          void *data, int force);
1211 extern sector_t bmap(struct inode *, sector_t);
1212 extern int setattr_mask(unsigned int);
1213 extern int notify_change(struct dentry *, struct iattr *);
1214 extern int permission(struct inode *, int, struct nameidata *);
1215 extern int vfs_permission(struct inode *, int);
1216 extern int get_write_access(struct inode *);
1217 extern int deny_write_access(struct file *);
1218 static inline void put_write_access(struct inode * inode)
1219 {
1220         atomic_dec(&inode->i_writecount);
1221 }
1222 static inline void allow_write_access(struct file *file)
1223 {
1224         if (file)
1225                 atomic_inc(&file->f_dentry->d_inode->i_writecount);
1226 }
1227 extern int do_pipe(int *);
1228 
1229 extern int open_namei(const char *, int, int, struct nameidata *);
1230 extern int may_open(struct nameidata *, int, int);
1231 
1232 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1233 extern struct file * open_exec(const char *);
1234  
1235 /* fs/dcache.c -- generic fs support functions */
1236 extern int is_subdir(struct dentry *, struct dentry *);
1237 extern ino_t find_inode_number(struct dentry *, struct qstr *);
1238 
1239 #include <linux/err.h>
1240 
1241 /* needed for stackable file system support */
1242 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1243 
1244 extern void inode_init_once(struct inode *);
1245 extern void iput(struct inode *);
1246 extern struct inode * igrab(struct inode *);
1247 extern ino_t iunique(struct super_block *, ino_t);
1248 extern int inode_needs_sync(struct inode *inode);
1249 extern void generic_delete_inode(struct inode *inode);
1250 
1251 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1252                 int (*test)(struct inode *, void *), void *data);
1253 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1254 
1255 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1256 extern struct inode * iget_locked(struct super_block *, unsigned long);
1257 extern void unlock_new_inode(struct inode *);
1258 
1259 static inline struct inode *iget(struct super_block *sb, unsigned long ino)
1260 {
1261         struct inode *inode = iget_locked(sb, ino);
1262         
1263         if (inode && (inode->i_state & I_NEW)) {
1264                 sb->s_op->read_inode(inode);
1265                 unlock_new_inode(inode);
1266         }
1267 
1268         return inode;
1269 }
1270 
1271 extern void __iget(struct inode * inode);
1272 extern void clear_inode(struct inode *);
1273 extern void destroy_inode(struct inode *);
1274 extern struct inode *new_inode(struct super_block *);
1275 extern void remove_suid(struct dentry *);
1276 
1277 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1278 extern void remove_inode_hash(struct inode *);
1279 static inline void insert_inode_hash(struct inode *inode) {
1280         __insert_inode_hash(inode, inode->i_ino);
1281 }
1282 
1283 extern struct file * get_empty_filp(void);
1284 extern void file_move(struct file *f, struct list_head *list);
1285 extern void file_kill(struct file *f);
1286 struct bio;
1287 extern int submit_bio(int, struct bio *);
1288 extern int bdev_read_only(struct block_device *);
1289 extern int set_blocksize(struct block_device *, int);
1290 extern int sb_set_blocksize(struct super_block *, int);
1291 extern int sb_min_blocksize(struct super_block *, int);
1292 
1293 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1294 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1295 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1296 extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1297 extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *);
1298 int generic_write_checks(struct inode *inode, struct file *file,
1299                         loff_t *pos, size_t *count, int isblk);
1300 extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *);
1301 extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t);
1302 extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *);
1303 extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t);
1304 extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1305                                 unsigned long, loff_t *);
1306 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1307 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1308 ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
1309                                 unsigned long nr_segs, loff_t *ppos);
1310 extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void __user *);
1311 extern void do_generic_mapping_read(struct address_space *, struct file_ra_state *, struct file *,
1312                                     loff_t *, read_descriptor_t *, read_actor_t);
1313 extern void
1314 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1315 extern ssize_t generic_file_direct_IO(int rw, struct kiocb *iocb,
1316         const struct iovec *iov, loff_t offset, unsigned long nr_segs);
1317 extern int blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, 
1318         struct block_device *bdev, const struct iovec *iov, loff_t offset, 
1319         unsigned long nr_segs, get_blocks_t *get_blocks, dio_iodone_t *end_io);
1320 extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov, 
1321         unsigned long nr_segs, loff_t *ppos);
1322 ssize_t generic_file_writev(struct file *filp, const struct iovec *iov, 
1323                         unsigned long nr_segs, loff_t *ppos);
1324 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1325 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1326 extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1327 extern int generic_file_open(struct inode * inode, struct file * filp);
1328 
1329 static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
1330                                         read_descriptor_t * desc,
1331                                         read_actor_t actor)
1332 {
1333         do_generic_mapping_read(filp->f_dentry->d_inode->i_mapping,
1334                                 &filp->f_ra,
1335                                 filp,
1336                                 ppos,
1337                                 desc,
1338                                 actor);
1339 }
1340 
1341 extern struct file_operations generic_ro_fops;
1342 
1343 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1344 
1345 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1346 extern int vfs_follow_link(struct nameidata *, const char *);
1347 extern int page_readlink(struct dentry *, char __user *, int);
1348 extern int page_follow_link(struct dentry *, struct nameidata *);
1349 extern int page_symlink(struct inode *inode, const char *symname, int len);
1350 extern struct inode_operations page_symlink_inode_operations;
1351 extern void generic_fillattr(struct inode *, struct kstat *);
1352 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1353 void inode_add_bytes(struct inode *inode, loff_t bytes);
1354 void inode_sub_bytes(struct inode *inode, loff_t bytes);
1355 loff_t inode_get_bytes(struct inode *inode);
1356 void inode_set_bytes(struct inode *inode, loff_t bytes);
1357 
1358 extern int vfs_readdir(struct file *, filldir_t, void *);
1359 
1360 extern int vfs_stat(char __user *, struct kstat *);
1361 extern int vfs_lstat(char __user *, struct kstat *);
1362 extern int vfs_fstat(unsigned int, struct kstat *);
1363 
1364 extern struct file_system_type *get_fs_type(const char *name);
1365 extern struct super_block *get_super(struct block_device *);
1366 extern struct super_block *user_get_super(dev_t);
1367 extern void drop_super(struct super_block *sb);
1368 
1369 extern int dcache_dir_open(struct inode *, struct file *);
1370 extern int dcache_dir_close(struct inode *, struct file *);
1371 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1372 extern int dcache_readdir(struct file *, void *, filldir_t);
1373 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1374 extern int simple_statfs(struct super_block *, struct kstatfs *);
1375 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1376 extern int simple_unlink(struct inode *, struct dentry *);
1377 extern int simple_rmdir(struct inode *, struct dentry *);
1378 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1379 extern int simple_sync_file(struct file *, struct dentry *, int);
1380 extern int simple_empty(struct dentry *);
1381 extern int simple_readpage(struct file *file, struct page *page);
1382 extern int simple_prepare_write(struct file *file, struct page *page,
1383                         unsigned offset, unsigned to);
1384 extern int simple_commit_write(struct file *file, struct page *page,
1385                                 unsigned offset, unsigned to);
1386 
1387 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1388 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
1389 extern struct file_operations simple_dir_operations;
1390 extern struct inode_operations simple_dir_inode_operations;
1391 struct tree_descr { char *name; struct file_operations *ops; int mode; };
1392 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
1393 extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count);
1394 extern void simple_release_fs(struct vfsmount **mount, int *count);
1395 
1396 extern int inode_change_ok(struct inode *, struct iattr *);
1397 extern int inode_setattr(struct inode *, struct iattr *);
1398 
1399 extern void inode_update_time(struct inode *inode, int ctime_too);
1400 
1401 static inline ino_t parent_ino(struct dentry *dentry)
1402 {
1403         ino_t res;
1404 
1405         spin_lock(&dentry->d_lock);
1406         res = dentry->d_parent->d_inode->i_ino;
1407         spin_unlock(&dentry->d_lock);
1408         return res;
1409 }
1410 
1411 #endif /* __KERNEL__ */
1412 #endif /* _LINUX_FS_H */
1413 

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