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/kdev_t.h>
15 #include <linux/ioctl.h>
16 #include <linux/dcache.h>
17 #include <linux/stat.h>
18 #include <linux/cache.h>
19 #include <linux/prio_tree.h>
20 #include <linux/kobject.h>
21 #include <asm/atomic.h>
25 struct pipe_inode_info;
26 struct poll_table_struct;
28 struct vm_area_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;
57 struct inodes_stat_t {
62 extern struct inodes_stat_t inodes_stat;
64 extern int leases_enable, dir_notify_enable, lease_break_time;
66 #define NR_FILE 8192 /* this can well be larger on a larger system */
67 #define NR_RESERVED_FILES 10 /* reserved for root */
82 #define READA 2 /* read-ahead - don't block if no resources */
83 #define SPECIAL 4 /* For non-blockdevice requests in request queue */
84 #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
85 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
91 /* public flags for file_system_type */
92 #define FS_REQUIRES_DEV 1
93 #define FS_BINARY_MOUNTDATA 2
94 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
95 #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
96 * as nfs_rename() will be cleaned up
99 * These are the fs-independent mount-flags: up to 32 flags are supported
101 #define MS_RDONLY 1 /* Mount read-only */
102 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
103 #define MS_NODEV 4 /* Disallow access to device special files */
104 #define MS_NOEXEC 8 /* Disallow program execution */
105 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
106 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
107 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
108 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
109 #define MS_NOATIME 1024 /* Do not update access times. */
110 #define MS_NODIRATIME 2048 /* Do not update directory access times */
114 #define MS_VERBOSE 32768
115 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
116 #define MS_ONE_SECOND (1<<17) /* fs has 1 sec a/m/ctime resolution */
117 #define MS_TAGXID (1<<24) /* tag inodes with context information */
118 #define MS_ACTIVE (1<<30)
119 #define MS_NOUSER (1<<31)
122 * Superblock flags that can be altered by MS_REMOUNT
124 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\
128 * Old magic mount flag and mask
130 #define MS_MGC_VAL 0xC0ED0000
131 #define MS_MGC_MSK 0xffff0000
133 /* Inode flags - they have nothing to superblock flags now */
135 #define S_SYNC 1 /* Writes are synced at once */
136 #define S_NOATIME 2 /* Do not update access times */
137 #define S_QUOTA 4 /* Quota initialized for file */
138 #define S_APPEND 8 /* Append-only file */
139 #define S_IMMUTABLE 16 /* Immutable file */
140 #define S_DEAD 32 /* removed, but still open directory */
141 #define S_NOQUOTA 64 /* Inode is not counted to quota */
142 #define S_DIRSYNC 128 /* Directory modifications are synchronous */
143 #define S_NOCMTIME 256 /* Do not update file c/mtime */
144 #define S_BARRIER 512 /* Barrier for chroot() */
145 #define S_IUNLINK 1024 /* Immutable unlink */
148 * Note that nosuid etc flags are inode-specific: setting some file-system
149 * flags just means all the inodes inherit those flags by default. It might be
150 * possible to override it selectively if you really wanted to with some
151 * ioctl() that is not currently implemented.
153 * Exception: MS_RDONLY is always applied to the entire file system.
155 * Unfortunately, it is possible to change a filesystems flags with it mounted
156 * with files in use. This means that all of the inodes will not have their
157 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
158 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
160 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
162 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
163 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
164 ((inode)->i_flags & S_SYNC))
165 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
166 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
167 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
169 #define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA)
170 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
171 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
172 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
173 #define IS_IUNLINK(inode) ((inode)->i_flags & S_IUNLINK)
174 #define IS_IXORUNLINK(inode) ((IS_IUNLINK(inode) ? S_IMMUTABLE : 0) ^ IS_IMMUTABLE(inode))
175 #define IS_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
176 #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
177 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
178 #define IS_ONE_SECOND(inode) __IS_FLG(inode, MS_ONE_SECOND)
180 #define IS_BARRIER(inode) (S_ISDIR((inode)->i_mode) && ((inode)->i_flags & S_BARRIER))
181 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
182 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
184 /* the read-only stuff doesn't really belong here, but any other place is
185 probably as bad and I don't want to create yet another include file. */
187 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
188 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
189 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
190 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
191 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
192 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
193 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
194 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
195 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
196 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
197 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
198 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
200 #define BLKPG _IO(0x12,105)/* See blkpg.h */
202 /* Some people are morons. Do not use sizeof! */
204 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
205 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
206 /* This was here just to show that the number is taken -
207 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
209 /* A jump here: 108-111 have been used for various private purposes. */
210 #define BLKBSZGET _IOR(0x12,112,size_t)
211 #define BLKBSZSET _IOW(0x12,113,size_t)
212 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
214 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
215 #define FIBMAP _IO(0x00,1) /* bmap access */
216 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
220 #include <linux/list.h>
221 #include <linux/radix-tree.h>
222 #include <linux/audit.h>
223 #include <asm/semaphore.h>
224 #include <asm/byteorder.h>
226 /* Used to be a macro which just called the function, now just a function */
227 extern void update_atime (struct inode *);
229 extern void inode_init(unsigned long);
230 extern void mnt_init(unsigned long);
231 extern void files_init(unsigned long);
234 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
235 struct buffer_head *bh_result, int create);
236 typedef int (get_blocks_t)(struct inode *inode, sector_t iblock,
237 unsigned long max_blocks,
238 struct buffer_head *bh_result, int create);
239 typedef void (dio_iodone_t)(struct inode *inode, loff_t offset,
240 ssize_t bytes, void *private);
243 * Attribute flags. These should be or-ed together to figure out what
250 #define ATTR_ATIME 16
251 #define ATTR_MTIME 32
252 #define ATTR_CTIME 64
253 #define ATTR_ATIME_SET 128
254 #define ATTR_MTIME_SET 256
255 #define ATTR_FORCE 512 /* Not a change, but a change it */
256 #define ATTR_ATTR_FLAG 1024
257 #define ATTR_KILL_SUID 2048
258 #define ATTR_KILL_SGID 4096
261 * This is the Inode Attributes structure, used for notify_change(). It
262 * uses the above definitions as flags, to know which values have changed.
263 * Also, in this manner, a Filesystem can look at only the values it cares
264 * about. Basically, these are the attributes that the VFS layer can
265 * request to change from the FS layer.
267 * Derek Atkins <warlord@MIT.EDU> 94-10-20
270 unsigned int ia_valid;
275 struct timespec ia_atime;
276 struct timespec ia_mtime;
277 struct timespec ia_ctime;
278 unsigned int ia_attr_flags;
282 * This is the inode attributes flag definitions
284 #define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */
285 #define ATTR_FLAG_NOATIME 2 /* Don't update atime */
286 #define ATTR_FLAG_APPEND 4 /* Append-only file */
287 #define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */
288 #define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */
290 #define ATTR_FLAG_BARRIER 512 /* Barrier for chroot() */
291 #define ATTR_FLAG_IUNLINK 1024 /* Immutable unlink */
294 * Includes for diskquotas.
296 #include <linux/quota.h>
299 * oh the beauties of C type declarations.
302 struct address_space;
303 struct writeback_control;
306 struct address_space_operations {
307 int (*writepage)(struct page *page, struct writeback_control *wbc);
308 int (*readpage)(struct file *, struct page *);
309 int (*sync_page)(struct page *);
311 /* Write back some dirty pages from this mapping. */
312 int (*writepages)(struct address_space *, struct writeback_control *);
314 /* Set a page dirty */
315 int (*set_page_dirty)(struct page *page);
317 int (*readpages)(struct file *filp, struct address_space *mapping,
318 struct list_head *pages, unsigned nr_pages);
321 * ext3 requires that a successful prepare_write() call be followed
322 * by a commit_write() call - they must be balanced
324 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
325 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
326 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
327 sector_t (*bmap)(struct address_space *, sector_t);
328 int (*invalidatepage) (struct page *, unsigned long);
329 int (*releasepage) (struct page *, int);
330 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
331 loff_t offset, unsigned long nr_segs);
334 struct backing_dev_info;
335 struct address_space {
336 struct inode *host; /* owner: inode, block_device */
337 struct radix_tree_root page_tree; /* radix tree of all pages */
338 spinlock_t tree_lock; /* and spinlock protecting it */
339 unsigned long nrpages; /* number of total pages */
340 pgoff_t writeback_index;/* writeback starts here */
341 struct address_space_operations *a_ops; /* methods */
342 struct prio_tree_root i_mmap; /* tree of private mappings */
343 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
344 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
345 spinlock_t i_mmap_lock; /* protect tree, count, list */
346 atomic_t truncate_count; /* Cover race condition with truncate */
347 unsigned long flags; /* error bits/gfp mask */
348 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
349 spinlock_t private_lock; /* for use by the address_space */
350 struct list_head private_list; /* ditto */
351 struct address_space *assoc_mapping; /* ditto */
354 struct block_device {
355 dev_t bd_dev; /* not a kdev_t - it's a search key */
356 struct inode * bd_inode; /* will die */
358 struct semaphore bd_sem; /* open/close mutex */
359 struct semaphore bd_mount_sem; /* mount mutex */
360 struct list_head bd_inodes;
363 struct block_device * bd_contains;
364 unsigned bd_block_size;
365 struct hd_struct * bd_part;
366 unsigned bd_part_count;
368 struct gendisk * bd_disk;
369 struct list_head bd_list;
370 struct backing_dev_info *bd_inode_backing_dev_info;
372 * Private data. You must have bd_claim'ed the block_device
373 * to use this. NOTE: bd_claim allows an owner to claim
374 * the same device multiple times, the owner must take special
375 * care to not mess up bd_private for that case.
377 unsigned long bd_private;
381 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
384 #define PAGECACHE_TAG_DIRTY 0
385 #define PAGECACHE_TAG_WRITEBACK 1
387 int mapping_tagged(struct address_space *mapping, int tag);
390 * Might pages of this file be mapped into userspace?
392 static inline int mapping_mapped(struct address_space *mapping)
394 return !prio_tree_empty(&mapping->i_mmap) ||
395 !list_empty(&mapping->i_mmap_nonlinear);
399 * Might pages of this file have been modified in userspace?
400 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
401 * marks vma as VM_SHARED if it is shared, and the file was opened for
402 * writing i.e. vma may be mprotected writable even if now readonly.
404 static inline int mapping_writably_mapped(struct address_space *mapping)
406 return mapping->i_mmap_writable != 0;
410 * Use sequence counter to get consistent i_size on 32-bit processors.
412 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
413 #include <linux/seqlock.h>
414 #define __NEED_I_SIZE_ORDERED
415 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
417 #define i_size_ordered_init(inode) do { } while (0)
421 struct hlist_node i_hash;
422 struct list_head i_list;
423 struct list_head i_dentry;
427 unsigned int i_nlink;
433 struct timespec i_atime;
434 struct timespec i_mtime;
435 struct timespec i_ctime;
436 unsigned int i_blkbits;
437 unsigned long i_blksize;
438 unsigned long i_version;
439 unsigned long i_blocks;
440 unsigned short i_bytes;
441 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
442 struct semaphore i_sem;
443 struct rw_semaphore i_alloc_sem;
444 struct inode_operations *i_op;
445 struct file_operations *i_fop; /* former ->i_op->default_file_ops */
446 struct super_block *i_sb;
447 struct file_lock *i_flock;
448 struct address_space *i_mapping;
449 struct address_space i_data;
451 struct dquot *i_dquot[MAXQUOTAS];
453 /* These three should probably be a union */
454 struct list_head i_devices;
455 struct pipe_inode_info *i_pipe;
456 struct block_device *i_bdev;
460 unsigned long i_dnotify_mask; /* Directory notify events */
461 struct dnotify_struct *i_dnotify; /* for directory notifications */
463 unsigned long i_state;
464 unsigned long dirtied_when; /* jiffies of first dirtying */
466 unsigned int i_flags;
467 unsigned char i_sock;
469 atomic_t i_writecount;
475 #ifdef __NEED_I_SIZE_ORDERED
476 seqcount_t i_size_seqcount;
481 * NOTE: in a 32bit arch with a preemptable kernel and
482 * an UP compile the i_size_read/write must be atomic
483 * with respect to the local cpu (unlike with preempt disabled),
484 * but they don't need to be atomic with respect to other cpus like in
485 * true SMP (so they need either to either locally disable irq around
486 * the read or for example on x86 they can be still implemented as a
487 * cmpxchg8b without the need of the lock prefix). For SMP compiles
488 * and 64bit archs it makes no difference if preempt is enabled or not.
490 static inline loff_t i_size_read(struct inode *inode)
492 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
497 seq = read_seqcount_begin(&inode->i_size_seqcount);
498 i_size = inode->i_size;
499 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
501 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
505 i_size = inode->i_size;
509 return inode->i_size;
514 static inline void i_size_write(struct inode *inode, loff_t i_size)
516 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
517 write_seqcount_begin(&inode->i_size_seqcount);
518 inode->i_size = i_size;
519 write_seqcount_end(&inode->i_size_seqcount);
520 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
522 inode->i_size = i_size;
525 inode->i_size = i_size;
529 static inline unsigned iminor(struct inode *inode)
531 return MINOR(inode->i_rdev);
534 static inline unsigned imajor(struct inode *inode)
536 return MAJOR(inode->i_rdev);
539 extern struct block_device *I_BDEV(struct inode *inode);
542 rwlock_t lock; /* protects pid, uid, euid fields */
543 int pid; /* pid or -pgrp where SIGIO should be sent */
544 uid_t uid, euid; /* uid/euid of process setting the owner */
546 int signum; /* posix.1b rt signal to be delivered on IO */
550 * Track a single file's readahead state
552 struct file_ra_state {
553 unsigned long start; /* Current window */
555 unsigned long next_size; /* Next window size */
556 unsigned long prev_page; /* Cache last read() position */
557 unsigned long ahead_start; /* Ahead window */
558 unsigned long ahead_size;
559 unsigned long serial_cnt; /* measure of sequentiality */
560 unsigned long average; /* another measure of sequentiality */
561 unsigned long ra_pages; /* Maximum readahead window */
562 unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
563 unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
567 struct list_head f_list;
568 struct dentry *f_dentry;
569 struct vfsmount *f_vfsmnt;
570 struct file_operations *f_op;
572 unsigned int f_flags;
576 struct fown_struct f_owner;
577 unsigned int f_uid, f_gid;
578 struct file_ra_state f_ra;
580 unsigned long f_version;
583 /* needed for tty driver, and maybe others */
587 /* Used by fs/eventpoll.c to link all the hooks to this file */
588 struct list_head f_ep_links;
589 spinlock_t f_ep_lock;
590 #endif /* #ifdef CONFIG_EPOLL */
591 struct address_space *f_mapping;
593 extern spinlock_t files_lock;
594 #define file_list_lock() spin_lock(&files_lock);
595 #define file_list_unlock() spin_unlock(&files_lock);
597 #define get_file(x) atomic_inc(&(x)->f_count)
598 #define file_count(x) atomic_read(&(x)->f_count)
600 /* Initialize and open a private file and allocate its security structure. */
601 extern int open_private_file(struct file *, struct dentry *, int);
602 /* Release a private file and free its security structure. */
603 extern void close_private_file(struct file *file);
605 #define MAX_NON_LFS ((1UL<<31) - 1)
607 /* Page cache limit. The filesystems should put that into their s_maxbytes
608 limits, otherwise bad things can happen in VM. */
609 #if BITS_PER_LONG==32
610 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
611 #elif BITS_PER_LONG==64
612 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
617 #define FL_ACCESS 8 /* not trying to lock, just looking */
618 #define FL_LOCKD 16 /* lock held by rpc.lockd */
619 #define FL_LEASE 32 /* lease held on this file */
620 #define FL_SLEEP 128 /* A blocking lock */
623 * The POSIX file lock owner is determined by
624 * the "struct files_struct" in the thread group
625 * (or NULL for no owner - BSD locks).
627 * Lockd stuffs a "host" pointer into this.
629 typedef struct files_struct *fl_owner_t;
631 /* that will die - we need it for nfs_lock_info */
632 #include <linux/nfs_fs_i.h>
635 struct file_lock *fl_next; /* singly linked list for this inode */
636 struct list_head fl_link; /* doubly linked list of all locks */
637 struct list_head fl_block; /* circular list of blocked processes */
640 wait_queue_head_t fl_wait;
641 struct file *fl_file;
642 unsigned char fl_flags;
643 unsigned char fl_type;
647 void (*fl_notify)(struct file_lock *); /* unblock callback */
648 void (*fl_insert)(struct file_lock *); /* lock insertion callback */
649 void (*fl_remove)(struct file_lock *); /* lock removal callback */
651 struct fasync_struct * fl_fasync; /* for lease break notifications */
652 unsigned long fl_break_time; /* for nonblocking lease breaks */
655 struct nfs_lock_info nfs_fl;
659 /* The following constant reflects the upper bound of the file/locking space */
661 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
662 #define OFFSET_MAX INT_LIMIT(loff_t)
663 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
666 extern struct list_head file_lock_list;
668 #include <linux/fcntl.h>
670 extern long generic_file_fcntl(int fd, unsigned int cmd,
671 unsigned long arg, struct file *filp);
673 extern int fcntl_getlk(struct file *, struct flock __user *);
674 extern int fcntl_setlk(struct file *, unsigned int, struct flock __user *);
676 #if BITS_PER_LONG == 32
677 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
678 extern int fcntl_setlk64(struct file *, unsigned int, struct flock64 __user *);
681 extern void send_sigio(struct fown_struct *fown, int fd, int band);
682 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
683 extern int fcntl_getlease(struct file *filp);
686 extern void locks_init_lock(struct file_lock *);
687 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
688 extern void locks_remove_posix(struct file *, fl_owner_t);
689 extern void locks_remove_flock(struct file *);
690 extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
691 extern int posix_lock_file(struct file *, struct file_lock *);
692 extern void posix_block_lock(struct file_lock *, struct file_lock *);
693 extern void posix_unblock_lock(struct file *, struct file_lock *);
694 extern int posix_locks_deadlock(struct file_lock *, struct file_lock *);
695 extern int __break_lease(struct inode *inode, unsigned int flags);
696 extern void lease_get_mtime(struct inode *, struct timespec *time);
697 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
698 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
699 extern void steal_locks(fl_owner_t from);
701 struct fasync_struct {
704 struct fasync_struct *fa_next; /* singly linked list */
705 struct file *fa_file;
708 #define FASYNC_MAGIC 0x4601
710 /* SMP safe fasync helpers: */
711 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
712 /* can be called from interrupts */
713 extern void kill_fasync(struct fasync_struct **, int, int);
714 /* only for net: no internal synchronization */
715 extern void __kill_fasync(struct fasync_struct *, int, int);
717 extern int f_setown(struct file *filp, unsigned long arg, int force);
718 extern void f_delown(struct file *filp);
719 extern int send_sigurg(struct fown_struct *fown);
725 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
726 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
728 extern struct list_head super_blocks;
729 extern spinlock_t sb_lock;
731 #define sb_entry(list) list_entry((list), struct super_block, s_list)
732 #define S_BIAS (1<<30)
734 struct list_head s_list; /* Keep this first */
735 dev_t s_dev; /* search index; _not_ kdev_t */
736 unsigned long s_blocksize;
737 unsigned long s_old_blocksize;
738 unsigned char s_blocksize_bits;
739 unsigned char s_dirt;
740 unsigned long long s_maxbytes; /* Max file size */
741 struct file_system_type *s_type;
742 struct super_operations *s_op;
743 struct dquot_operations *dq_op;
744 struct quotactl_ops *s_qcop;
745 struct export_operations *s_export_op;
746 unsigned long s_flags;
747 unsigned long s_magic;
748 struct dentry *s_root;
749 struct rw_semaphore s_umount;
750 struct semaphore s_lock;
757 struct list_head s_dirty; /* dirty inodes */
758 struct list_head s_io; /* parked for writeback */
759 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
760 struct list_head s_files;
762 struct block_device *s_bdev;
763 struct list_head s_instances;
764 struct quota_info s_dquot; /* Diskquota specific options */
767 wait_queue_head_t s_wait_unfrozen;
769 char s_id[32]; /* Informational name */
771 void *s_fs_info; /* Filesystem private info */
774 * The next field is for VFS *only*. No filesystems have any business
775 * even looking at it. You had been warned.
777 struct semaphore s_vfs_rename_sem; /* Kludge */
781 * Snapshotting support.
789 #define vfs_check_frozen(sb, level) \
790 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
793 * Superblock locking.
795 static inline void lock_super(struct super_block * sb)
800 static inline void unlock_super(struct super_block * sb)
806 * VFS helper functions..
808 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
809 extern int vfs_mkdir(struct inode *, struct dentry *, int);
810 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
811 extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
812 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
813 extern int vfs_rmdir(struct inode *, struct dentry *);
814 extern int vfs_unlink(struct inode *, struct dentry *);
815 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
820 * NOTE! These match bits 12..15 of stat.st_mode
821 * (ie "(i_mode >> 12) & 15").
834 * This is the "filldir" function type, used by readdir() to let
835 * the kernel specify what kind of dirent layout it wants to have.
836 * This allows the kernel to read directories into kernel space or
837 * to have different dirent layouts depending on the binary type.
839 typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned);
841 struct block_device_operations {
842 int (*open) (struct inode *, struct file *);
843 int (*release) (struct inode *, struct file *);
844 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
845 int (*media_changed) (struct gendisk *);
846 int (*revalidate_disk) (struct gendisk *);
847 struct module *owner;
851 * "descriptor" for what we're up to with a read for sendfile().
852 * This allows us to use the same read code yet
853 * have multiple different users of the data that
854 * we read from a file.
856 * The simplest case just copies the data to user
866 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
870 * read, write, poll, fsync, readv, writev can be called
871 * without the big kernel lock held in all filesystems.
873 struct file_operations {
874 struct module *owner;
875 loff_t (*llseek) (struct file *, loff_t, int);
876 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
877 ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
878 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
879 ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);
880 int (*readdir) (struct file *, void *, filldir_t);
881 unsigned int (*poll) (struct file *, struct poll_table_struct *);
882 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
883 int (*mmap) (struct file *, struct vm_area_struct *);
884 int (*open) (struct inode *, struct file *);
885 int (*flush) (struct file *);
886 int (*release) (struct inode *, struct file *);
887 int (*fsync) (struct file *, struct dentry *, int datasync);
888 int (*aio_fsync) (struct kiocb *, int datasync);
889 int (*fasync) (int, struct file *, int);
890 int (*lock) (struct file *, int, struct file_lock *);
891 ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
892 ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
893 ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void __user *);
894 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
895 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
896 long (*fcntl)(int fd, unsigned int cmd,
897 unsigned long arg, struct file *filp);
900 struct inode_operations {
901 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
902 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
903 int (*link) (struct dentry *,struct inode *,struct dentry *);
904 int (*unlink) (struct inode *,struct dentry *);
905 int (*symlink) (struct inode *,struct dentry *,const char *);
906 int (*mkdir) (struct inode *,struct dentry *,int);
907 int (*rmdir) (struct inode *,struct dentry *);
908 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
909 int (*rename) (struct inode *, struct dentry *,
910 struct inode *, struct dentry *);
911 int (*readlink) (struct dentry *, char __user *,int);
912 int (*follow_link) (struct dentry *, struct nameidata *);
913 void (*put_link) (struct dentry *, struct nameidata *);
914 void (*truncate) (struct inode *);
915 int (*permission) (struct inode *, int, struct nameidata *);
916 int (*setattr) (struct dentry *, struct iattr *);
917 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
918 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
919 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
920 ssize_t (*listxattr) (struct dentry *, char *, size_t);
921 int (*removexattr) (struct dentry *, const char *);
926 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
927 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
928 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
929 unsigned long, loff_t *);
930 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
931 unsigned long, loff_t *);
934 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
935 * without the big kernel lock held in all filesystems.
937 struct super_operations {
938 struct inode *(*alloc_inode)(struct super_block *sb);
939 void (*destroy_inode)(struct inode *);
941 void (*read_inode) (struct inode *);
943 void (*dirty_inode) (struct inode *);
944 void (*write_inode) (struct inode *, int);
945 void (*put_inode) (struct inode *);
946 void (*drop_inode) (struct inode *);
947 void (*delete_inode) (struct inode *);
948 void (*put_super) (struct super_block *);
949 void (*write_super) (struct super_block *);
950 int (*sync_fs)(struct super_block *sb, int wait);
951 void (*write_super_lockfs) (struct super_block *);
952 void (*unlockfs) (struct super_block *);
953 int (*statfs) (struct super_block *, struct kstatfs *);
954 int (*remount_fs) (struct super_block *, int *, char *);
955 void (*clear_inode) (struct inode *);
956 void (*umount_begin) (struct super_block *);
958 int (*show_options)(struct seq_file *, struct vfsmount *);
961 /* Inode state bits. Protected by inode_lock. */
962 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
963 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
964 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
970 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
972 extern void __mark_inode_dirty(struct inode *, int);
973 static inline void mark_inode_dirty(struct inode *inode)
975 __mark_inode_dirty(inode, I_DIRTY);
978 static inline void mark_inode_dirty_sync(struct inode *inode)
980 __mark_inode_dirty(inode, I_DIRTY_SYNC);
983 static inline void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
985 /* per-mountpoint checks will go here */
986 update_atime(dentry->d_inode);
989 static inline void file_accessed(struct file *file)
991 touch_atime(file->f_vfsmnt, file->f_dentry);
994 int sync_inode(struct inode *inode, struct writeback_control *wbc);
997 * &export_operations - for nfsd to communicate with file systems
998 * decode_fh: decode a file handle fragment and return a &struct dentry
999 * encode_fh: encode a file handle fragment from a dentry
1000 * get_name: find the name for a given inode in a given directory
1001 * get_parent: find the parent of a given directory
1002 * get_dentry: find a dentry for the inode given a file handle sub-fragment
1005 * The export_operations structure provides a means for nfsd to communicate
1006 * with a particular exported file system - particularly enabling nfsd and
1007 * the filesystem to co-operate when dealing with file handles.
1009 * export_operations contains two basic operation for dealing with file handles,
1010 * decode_fh() and encode_fh(), and allows for some other operations to be defined
1011 * which standard helper routines use to get specific information from the
1014 * nfsd encodes information use to determine which filesystem a filehandle
1015 * applies to in the initial part of the file handle. The remainder, termed a
1016 * file handle fragment, is controlled completely by the filesystem.
1017 * The standard helper routines assume that this fragment will contain one or two
1018 * sub-fragments, one which identifies the file, and one which may be used to
1019 * identify the (a) directory containing the file.
1021 * In some situations, nfsd needs to get a dentry which is connected into a
1022 * specific part of the file tree. To allow for this, it passes the function
1023 * acceptable() together with a @context which can be used to see if the dentry
1024 * is acceptable. As there can be multiple dentrys for a given file, the filesystem
1025 * should check each one for acceptability before looking for the next. As soon
1026 * as an acceptable one is found, it should be returned.
1029 * @decode_fh is given a &struct super_block (@sb), a file handle fragment (@fh, @fh_len)
1030 * and an acceptability testing function (@acceptable, @context). It should return
1031 * a &struct dentry which refers to the same file that the file handle fragment refers
1032 * to, and which passes the acceptability test. If it cannot, it should return
1033 * a %NULL pointer if the file was found but no acceptable &dentries were available, or
1034 * a %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or %ENOMEM).
1037 * @encode_fh should store in the file handle fragment @fh (using at most @max_len bytes)
1038 * information that can be used by @decode_fh to recover the file refered to by the
1039 * &struct dentry @de. If the @connectable flag is set, the encode_fh() should store
1040 * sufficient information so that a good attempt can be made to find not only
1041 * the file but also it's place in the filesystem. This typically means storing
1042 * a reference to de->d_parent in the filehandle fragment.
1043 * encode_fh() should return the number of bytes stored or a negative error code
1047 * @get_name should find a name for the given @child in the given @parent directory.
1048 * The name should be stored in the @name (with the understanding that it is already
1049 * pointing to a a %NAME_MAX+1 sized buffer. get_name() should return %0 on success,
1050 * a negative error code or error.
1051 * @get_name will be called without @parent->i_sem held.
1054 * @get_parent should find the parent directory for the given @child which is also
1055 * a directory. In the event that it cannot be found, or storage space cannot be
1056 * allocated, a %ERR_PTR should be returned.
1059 * Given a &super_block (@sb) and a pointer to a file-system specific inode identifier,
1060 * possibly an inode number, (@inump) get_dentry() should find the identified inode and
1061 * return a dentry for that inode.
1062 * Any suitable dentry can be returned including, if necessary, a new dentry created
1063 * with d_alloc_root. The caller can then find any other extant dentrys by following the
1064 * d_alias links. If a new dentry was created using d_alloc_root, DCACHE_NFSD_DISCONNECTED
1065 * should be set, and the dentry should be d_rehash()ed.
1067 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code can be returned.
1068 * The @inump will be whatever was passed to nfsd_find_fh_dentry() in either the
1069 * @obj or @parent parameters.
1072 * get_parent is called with child->d_inode->i_sem down
1073 * get_name is not (which is possibly inconsistent)
1076 struct export_operations {
1077 struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
1078 int (*acceptable)(void *context, struct dentry *de),
1080 int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
1083 /* the following are only called from the filesystem itself */
1084 int (*get_name)(struct dentry *parent, char *name,
1085 struct dentry *child);
1086 struct dentry * (*get_parent)(struct dentry *child);
1087 struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
1089 /* This is set by the exporting module to a standard helper */
1090 struct dentry * (*find_exported_dentry)(
1091 struct super_block *sb, void *obj, void *parent,
1092 int (*acceptable)(void *context, struct dentry *de),
1099 struct file_system_type {
1102 struct super_block *(*get_sb) (struct file_system_type *, int,
1103 const char *, void *);
1104 void (*kill_sb) (struct super_block *);
1105 struct module *owner;
1106 struct file_system_type * next;
1107 struct list_head fs_supers;
1110 struct super_block *get_sb_bdev(struct file_system_type *fs_type,
1111 int flags, const char *dev_name, void *data,
1112 int (*fill_super)(struct super_block *, void *, int));
1113 struct super_block *get_sb_single(struct file_system_type *fs_type,
1114 int flags, void *data,
1115 int (*fill_super)(struct super_block *, void *, int));
1116 struct super_block *get_sb_nodev(struct file_system_type *fs_type,
1117 int flags, void *data,
1118 int (*fill_super)(struct super_block *, void *, int));
1119 void generic_shutdown_super(struct super_block *sb);
1120 void kill_block_super(struct super_block *sb);
1121 void kill_anon_super(struct super_block *sb);
1122 void kill_litter_super(struct super_block *sb);
1123 void deactivate_super(struct super_block *sb);
1124 int set_anon_super(struct super_block *s, void *data);
1125 struct super_block *sget(struct file_system_type *type,
1126 int (*test)(struct super_block *,void *),
1127 int (*set)(struct super_block *,void *),
1129 struct super_block *get_sb_pseudo(struct file_system_type *, char *,
1130 struct super_operations *ops, unsigned long);
1131 int __put_super(struct super_block *sb);
1132 void unnamed_dev_init(void);
1134 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1135 #define fops_get(fops) \
1136 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1137 #define fops_put(fops) \
1138 do { if (fops) module_put((fops)->owner); } while(0)
1140 extern int register_filesystem(struct file_system_type *);
1141 extern int unregister_filesystem(struct file_system_type *);
1142 extern struct vfsmount *kern_mount(struct file_system_type *);
1143 extern int may_umount_tree(struct vfsmount *);
1144 extern int may_umount(struct vfsmount *);
1145 extern long do_mount(char *, char *, char *, unsigned long, void *);
1147 extern int vfs_statfs(struct super_block *, struct kstatfs *);
1149 /* Return value for VFS lock functions - tells locks.c to lock conventionally
1150 * REALLY kosha for root NFS and nfs_lock
1152 #define LOCK_USE_CLNT 1
1154 #define FLOCK_VERIFY_READ 1
1155 #define FLOCK_VERIFY_WRITE 2
1157 extern int locks_mandatory_locked(struct inode *);
1158 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1161 * Candidates for mandatory locking have the setgid bit set
1162 * but no group execute bit - an otherwise meaningless combination.
1164 #define MANDATORY_LOCK(inode) \
1165 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1167 static inline int locks_verify_locked(struct inode *inode)
1169 if (MANDATORY_LOCK(inode))
1170 return locks_mandatory_locked(inode);
1174 static inline int locks_verify_area(int read_write, struct inode *inode,
1175 struct file *filp, loff_t offset,
1178 if (inode->i_flock && MANDATORY_LOCK(inode))
1179 return locks_mandatory_area(read_write, inode, filp, offset, count);
1183 static inline int locks_verify_truncate(struct inode *inode,
1187 if (inode->i_flock && MANDATORY_LOCK(inode))
1188 return locks_mandatory_area(
1189 FLOCK_VERIFY_WRITE, inode, filp,
1190 size < inode->i_size ? size : inode->i_size,
1191 (size < inode->i_size ? inode->i_size - size
1192 : size - inode->i_size)
1197 static inline int break_lease(struct inode *inode, unsigned int mode)
1200 return __break_lease(inode, mode);
1206 extern int do_truncate(struct dentry *, loff_t start);
1207 extern struct file *filp_open(const char *, int, int);
1208 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1209 extern int filp_close(struct file *, fl_owner_t id);
1210 extern char * getname(const char __user *);
1213 extern void vfs_caches_init(unsigned long);
1215 #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
1216 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1217 #ifndef CONFIG_AUDITSYSCALL
1218 #define putname(name) __putname(name)
1220 #define putname(name) \
1222 if (unlikely(current->audit_context)) \
1223 audit_putname(name); \
1229 extern int register_blkdev(unsigned int, const char *);
1230 extern int unregister_blkdev(unsigned int, const char *);
1231 extern struct block_device *bdget(dev_t);
1232 extern void bd_set_size(struct block_device *, loff_t size);
1233 extern void bd_forget(struct inode *inode);
1234 extern void bdput(struct block_device *);
1235 extern int blkdev_open(struct inode *, struct file *);
1236 extern struct block_device *open_by_devnum(dev_t, unsigned);
1237 extern struct file_operations def_blk_fops;
1238 extern struct address_space_operations def_blk_aops;
1239 extern struct file_operations def_chr_fops;
1240 extern struct file_operations bad_sock_fops;
1241 extern struct file_operations def_fifo_fops;
1242 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1243 extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
1244 extern int blkdev_get(struct block_device *, mode_t, unsigned);
1245 extern int blkdev_put(struct block_device *);
1246 extern int bd_claim(struct block_device *, void *);
1247 extern void bd_release(struct block_device *);
1250 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, char *);
1251 extern int register_chrdev_region(dev_t, unsigned, char *);
1252 extern int register_chrdev(unsigned int, const char *,
1253 struct file_operations *);
1254 extern int unregister_chrdev(unsigned int, const char *);
1255 extern void unregister_chrdev_region(dev_t, unsigned);
1256 extern int chrdev_open(struct inode *, struct file *);
1258 /* fs/block_dev.c */
1259 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1260 extern const char *__bdevname(dev_t, char *buffer);
1261 extern const char *bdevname(struct block_device *bdev, char *buffer);
1262 extern struct block_device *lookup_bdev(const char *);
1263 extern struct block_device *open_bdev_excl(const char *, int, void *);
1264 extern void close_bdev_excl(struct block_device *);
1266 extern void init_special_inode(struct inode *, umode_t, dev_t);
1268 /* Invalid inode operations -- fs/bad_inode.c */
1269 extern void make_bad_inode(struct inode *);
1270 extern int is_bad_inode(struct inode *);
1272 extern struct file_operations read_fifo_fops;
1273 extern struct file_operations write_fifo_fops;
1274 extern struct file_operations rdwr_fifo_fops;
1275 extern struct file_operations read_pipe_fops;
1276 extern struct file_operations write_pipe_fops;
1277 extern struct file_operations rdwr_pipe_fops;
1279 extern int fs_may_remount_ro(struct super_block *);
1282 * return READ, READA, or WRITE
1284 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1287 * return data direction, READ or WRITE
1289 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1291 extern int check_disk_change(struct block_device *);
1292 extern int invalidate_inodes(struct super_block *);
1293 extern int __invalidate_device(struct block_device *, int);
1294 extern int invalidate_partition(struct gendisk *, int);
1295 unsigned long invalidate_mapping_pages(struct address_space *mapping,
1296 pgoff_t start, pgoff_t end);
1297 unsigned long invalidate_inode_pages(struct address_space *mapping);
1298 static inline void invalidate_remote_inode(struct inode *inode)
1300 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1301 S_ISLNK(inode->i_mode))
1302 invalidate_inode_pages(inode->i_mapping);
1304 extern void invalidate_inode_pages2(struct address_space *mapping);
1305 extern void write_inode_now(struct inode *, int);
1306 extern int filemap_fdatawrite(struct address_space *);
1307 extern int filemap_flush(struct address_space *);
1308 extern int filemap_fdatawait(struct address_space *);
1309 extern int filemap_write_and_wait(struct address_space *mapping);
1310 extern void sync_supers(void);
1311 extern void sync_filesystems(int wait);
1312 extern void emergency_sync(void);
1313 extern void emergency_remount(void);
1314 extern int do_remount_sb(struct super_block *sb, int flags,
1315 void *data, int force);
1316 extern sector_t bmap(struct inode *, sector_t);
1317 extern int setattr_mask(unsigned int);
1318 extern int notify_change(struct dentry *, struct iattr *);
1319 extern int permission(struct inode *, int, struct nameidata *);
1320 extern int vfs_permission(struct inode *, int);
1321 extern int get_write_access(struct inode *);
1322 extern int deny_write_access(struct file *);
1323 static inline void put_write_access(struct inode * inode)
1325 atomic_dec(&inode->i_writecount);
1327 static inline void allow_write_access(struct file *file)
1330 atomic_inc(&file->f_dentry->d_inode->i_writecount);
1332 extern int do_pipe(int *);
1334 extern int open_namei(const char *, int, int, struct nameidata *);
1335 extern int may_open(struct nameidata *, int, int);
1337 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1338 extern struct file * open_exec(const char *);
1340 /* fs/dcache.c -- generic fs support functions */
1341 extern int is_subdir(struct dentry *, struct dentry *);
1342 extern ino_t find_inode_number(struct dentry *, struct qstr *);
1344 #include <linux/err.h>
1346 /* needed for stackable file system support */
1347 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1349 extern void inode_init_once(struct inode *);
1350 extern void iput(struct inode *);
1351 extern struct inode * igrab(struct inode *);
1352 extern ino_t iunique(struct super_block *, ino_t);
1353 extern int inode_needs_sync(struct inode *inode);
1354 extern void generic_delete_inode(struct inode *inode);
1356 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1357 int (*test)(struct inode *, void *), void *data);
1358 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1360 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1361 extern struct inode * iget_locked(struct super_block *, unsigned long);
1362 extern void unlock_new_inode(struct inode *);
1364 static inline struct inode *iget(struct super_block *sb, unsigned long ino)
1366 struct inode *inode = iget_locked(sb, ino);
1368 if (inode && (inode->i_state & I_NEW)) {
1369 sb->s_op->read_inode(inode);
1370 unlock_new_inode(inode);
1376 extern void __iget(struct inode * inode);
1377 extern void clear_inode(struct inode *);
1378 extern void destroy_inode(struct inode *);
1379 extern struct inode *new_inode(struct super_block *);
1380 extern int remove_suid(struct dentry *);
1382 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1383 extern void remove_inode_hash(struct inode *);
1384 static inline void insert_inode_hash(struct inode *inode) {
1385 __insert_inode_hash(inode, inode->i_ino);
1388 extern struct file * get_empty_filp(void);
1389 extern void file_move(struct file *f, struct list_head *list);
1390 extern void file_kill(struct file *f);
1392 extern void submit_bio(int, struct bio *);
1393 extern int bdev_read_only(struct block_device *);
1394 extern int set_blocksize(struct block_device *, int);
1395 extern int sb_set_blocksize(struct super_block *, int);
1396 extern int sb_min_blocksize(struct super_block *, int);
1398 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1399 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1400 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1401 extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1402 extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *);
1403 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
1404 extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *);
1405 extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t);
1406 extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *);
1407 extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t);
1408 extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1409 unsigned long, loff_t *);
1410 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1411 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1412 ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
1413 unsigned long nr_segs, loff_t *ppos);
1414 extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void __user *);
1415 extern void do_generic_mapping_read(struct address_space *mapping,
1416 struct file_ra_state *, struct file *,
1417 loff_t *, read_descriptor_t *, read_actor_t, int);
1419 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1420 extern ssize_t generic_file_direct_IO(int rw, struct kiocb *iocb,
1421 const struct iovec *iov, loff_t offset, unsigned long nr_segs);
1422 extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov,
1423 unsigned long nr_segs, loff_t *ppos);
1424 ssize_t generic_file_writev(struct file *filp, const struct iovec *iov,
1425 unsigned long nr_segs, loff_t *ppos);
1426 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1427 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1428 extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1429 extern int generic_file_open(struct inode * inode, struct file * filp);
1431 static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
1432 read_descriptor_t * desc,
1433 read_actor_t actor, int nonblock)
1435 do_generic_mapping_read(filp->f_mapping,
1444 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1445 struct block_device *bdev, const struct iovec *iov, loff_t offset,
1446 unsigned long nr_segs, get_blocks_t get_blocks, dio_iodone_t end_io,
1447 int needs_special_locking);
1450 * For filesystems which need locking between buffered and direct access
1452 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1453 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1454 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1455 dio_iodone_t end_io)
1457 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1458 nr_segs, get_blocks, end_io, 1);
1461 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1462 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1463 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1464 dio_iodone_t end_io)
1466 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1467 nr_segs, get_blocks, end_io, 0);
1470 extern struct file_operations generic_ro_fops;
1472 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1474 extern void nd_set_link(struct nameidata *, char *);
1475 extern char *nd_get_link(struct nameidata *);
1476 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1477 extern int vfs_follow_link(struct nameidata *, const char *);
1478 extern int page_readlink(struct dentry *, char __user *, int);
1479 extern int page_follow_link(struct dentry *, struct nameidata *);
1480 extern int page_follow_link_light(struct dentry *, struct nameidata *);
1481 extern void page_put_link(struct dentry *, struct nameidata *);
1482 extern int page_symlink(struct inode *inode, const char *symname, int len);
1483 extern struct inode_operations page_symlink_inode_operations;
1484 extern int generic_readlink(struct dentry *, char __user *, int);
1485 extern void generic_fillattr(struct inode *, struct kstat *);
1486 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1487 void inode_add_bytes(struct inode *inode, loff_t bytes);
1488 void inode_sub_bytes(struct inode *inode, loff_t bytes);
1489 loff_t inode_get_bytes(struct inode *inode);
1490 void inode_set_bytes(struct inode *inode, loff_t bytes);
1492 extern int vfs_readdir(struct file *, filldir_t, void *);
1494 extern int vfs_stat(char __user *, struct kstat *);
1495 extern int vfs_lstat(char __user *, struct kstat *);
1496 extern int vfs_fstat(unsigned int, struct kstat *);
1498 extern struct file_system_type *get_fs_type(const char *name);
1499 extern struct super_block *get_super(struct block_device *);
1500 extern struct super_block *user_get_super(dev_t);
1501 extern void drop_super(struct super_block *sb);
1503 extern int dcache_dir_open(struct inode *, struct file *);
1504 extern int dcache_dir_close(struct inode *, struct file *);
1505 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1506 extern int dcache_readdir(struct file *, void *, filldir_t);
1507 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1508 extern int simple_statfs(struct super_block *, struct kstatfs *);
1509 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1510 extern int simple_unlink(struct inode *, struct dentry *);
1511 extern int simple_rmdir(struct inode *, struct dentry *);
1512 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1513 extern int simple_sync_file(struct file *, struct dentry *, int);
1514 extern int simple_empty(struct dentry *);
1515 extern int simple_readpage(struct file *file, struct page *page);
1516 extern int simple_prepare_write(struct file *file, struct page *page,
1517 unsigned offset, unsigned to);
1518 extern int simple_commit_write(struct file *file, struct page *page,
1519 unsigned offset, unsigned to);
1521 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1522 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
1523 extern struct file_operations simple_dir_operations;
1524 extern struct inode_operations simple_dir_inode_operations;
1525 struct tree_descr { char *name; struct file_operations *ops; int mode; };
1526 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
1527 extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count);
1528 extern void simple_release_fs(struct vfsmount **mount, int *count);
1530 extern int inode_change_ok(struct inode *, struct iattr *);
1531 extern int inode_setattr(struct inode *, struct iattr *);
1533 extern void inode_update_time(struct inode *inode, int ctime_too);
1535 static inline ino_t parent_ino(struct dentry *dentry)
1539 spin_lock(&dentry->d_lock);
1540 res = dentry->d_parent->d_inode->i_ino;
1541 spin_unlock(&dentry->d_lock);
1546 extern int unshare_files(void);
1548 #ifdef CONFIG_SECURITY
1549 static inline char *alloc_secdata(void)
1551 return (char *)get_zeroed_page(GFP_KERNEL);
1554 static inline void free_secdata(void *secdata)
1556 free_page((unsigned long)secdata);
1559 static inline char *alloc_secdata(void)
1564 static inline void free_secdata(void *secdata)
1566 #endif /* CONFIG_SECURITY */
1568 #endif /* __KERNEL__ */
1569 #endif /* _LINUX_FS_H */