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/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 #include <linux/audit.h>
27 struct pipe_inode_info;
28 struct poll_table_struct;
30 struct vm_area_struct;
34 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
35 * the file limit at runtime and only root can increase the per-process
36 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
37 * upper limit on files-per-process.
39 * Some programs (notably those using select()) may have to be
40 * recompiled to take full advantage of the new limits..
43 /* Fixed constants first: */
45 #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
46 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
48 #define BLOCK_SIZE_BITS 10
49 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
51 /* And dynamically-tunable limits and defaults: */
52 struct files_stat_struct {
53 int nr_files; /* read only */
54 int nr_free_files; /* read only */
55 int max_files; /* tunable */
57 extern struct files_stat_struct files_stat;
59 struct inodes_stat_t {
64 extern struct inodes_stat_t inodes_stat;
66 extern int leases_enable, dir_notify_enable, lease_break_time;
68 #define NR_FILE 8192 /* this can well be larger on a larger system */
69 #define NR_RESERVED_FILES 10 /* reserved for root */
84 #define READA 2 /* read-ahead - don't block if no resources */
85 #define SPECIAL 4 /* For non-blockdevice requests in request queue */
86 #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
87 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
93 /* public flags for file_system_type */
94 #define FS_REQUIRES_DEV 1
95 #define FS_BINARY_MOUNTDATA 2
96 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
97 #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
98 * as nfs_rename() will be cleaned up
101 * These are the fs-independent mount-flags: up to 32 flags are supported
103 #define MS_RDONLY 1 /* Mount read-only */
104 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
105 #define MS_NODEV 4 /* Disallow access to device special files */
106 #define MS_NOEXEC 8 /* Disallow program execution */
107 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
108 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
109 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
110 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
111 #define MS_NOATIME 1024 /* Do not update access times. */
112 #define MS_NODIRATIME 2048 /* Do not update directory access times */
116 #define MS_VERBOSE 32768
117 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
118 #define MS_ONE_SECOND (1<<17) /* fs has 1 sec a/m/ctime resolution */
119 #define MS_TAGXID (1<<24) /* tag inodes with context information */
120 #define MS_ACTIVE (1<<30)
121 #define MS_NOUSER (1<<31)
124 * Superblock flags that can be altered by MS_REMOUNT
126 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\
130 * Old magic mount flag and mask
132 #define MS_MGC_VAL 0xC0ED0000
133 #define MS_MGC_MSK 0xffff0000
135 /* Inode flags - they have nothing to superblock flags now */
137 #define S_SYNC 1 /* Writes are synced at once */
138 #define S_NOATIME 2 /* Do not update access times */
139 #define S_QUOTA 4 /* Quota initialized for file */
140 #define S_APPEND 8 /* Append-only file */
141 #define S_IMMUTABLE 16 /* Immutable file */
142 #define S_DEAD 32 /* removed, but still open directory */
143 #define S_NOQUOTA 64 /* Inode is not counted to quota */
144 #define S_DIRSYNC 128 /* Directory modifications are synchronous */
145 #define S_NOCMTIME 256 /* Do not update file c/mtime */
146 #define S_BARRIER 512 /* Barrier for chroot() */
147 #define S_IUNLINK 1024 /* Immutable unlink */
150 * Note that nosuid etc flags are inode-specific: setting some file-system
151 * flags just means all the inodes inherit those flags by default. It might be
152 * possible to override it selectively if you really wanted to with some
153 * ioctl() that is not currently implemented.
155 * Exception: MS_RDONLY is always applied to the entire file system.
157 * Unfortunately, it is possible to change a filesystems flags with it mounted
158 * with files in use. This means that all of the inodes will not have their
159 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
160 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
162 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
164 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
165 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
166 ((inode)->i_flags & S_SYNC))
167 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
168 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
169 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
171 #define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA)
172 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
173 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
174 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
175 #define IS_IUNLINK(inode) ((inode)->i_flags & S_IUNLINK)
176 #define IS_IXORUNLINK(inode) ((IS_IUNLINK(inode) ? S_IMMUTABLE : 0) ^ IS_IMMUTABLE(inode))
177 #define IS_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
178 #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
179 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
180 #define IS_ONE_SECOND(inode) __IS_FLG(inode, MS_ONE_SECOND)
182 #define IS_BARRIER(inode) (S_ISDIR((inode)->i_mode) && ((inode)->i_flags & S_BARRIER))
183 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
184 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
186 /* the read-only stuff doesn't really belong here, but any other place is
187 probably as bad and I don't want to create yet another include file. */
189 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
190 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
191 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
192 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
193 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
194 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
195 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
196 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
197 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
198 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
199 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
200 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
202 #define BLKPG _IO(0x12,105)/* See blkpg.h */
204 /* Some people are morons. Do not use sizeof! */
206 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
207 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
208 /* This was here just to show that the number is taken -
209 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
211 /* A jump here: 108-111 have been used for various private purposes. */
212 #define BLKBSZGET _IOR(0x12,112,size_t)
213 #define BLKBSZSET _IOW(0x12,113,size_t)
214 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
216 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
217 #define FIBMAP _IO(0x00,1) /* bmap access */
218 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
222 #include <asm/semaphore.h>
223 #include <asm/byteorder.h>
225 /* Used to be a macro which just called the function, now just a function */
226 extern void update_atime (struct inode *);
228 extern void inode_init(unsigned long);
229 extern void mnt_init(unsigned long);
230 extern void files_init(unsigned long);
233 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
234 struct buffer_head *bh_result, int create);
235 typedef int (get_blocks_t)(struct inode *inode, sector_t iblock,
236 unsigned long max_blocks,
237 struct buffer_head *bh_result, int create);
238 typedef void (dio_iodone_t)(struct inode *inode, loff_t offset,
239 ssize_t bytes, void *private);
242 * Attribute flags. These should be or-ed together to figure out what
249 #define ATTR_ATIME 16
250 #define ATTR_MTIME 32
251 #define ATTR_CTIME 64
252 #define ATTR_ATIME_SET 128
253 #define ATTR_MTIME_SET 256
254 #define ATTR_FORCE 512 /* Not a change, but a change it */
255 #define ATTR_ATTR_FLAG 1024
256 #define ATTR_KILL_SUID 2048
257 #define ATTR_KILL_SGID 4096
260 * This is the Inode Attributes structure, used for notify_change(). It
261 * uses the above definitions as flags, to know which values have changed.
262 * Also, in this manner, a Filesystem can look at only the values it cares
263 * about. Basically, these are the attributes that the VFS layer can
264 * request to change from the FS layer.
266 * Derek Atkins <warlord@MIT.EDU> 94-10-20
269 unsigned int ia_valid;
274 struct timespec ia_atime;
275 struct timespec ia_mtime;
276 struct timespec ia_ctime;
277 unsigned int ia_attr_flags;
281 * This is the inode attributes flag definitions
283 #define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */
284 #define ATTR_FLAG_NOATIME 2 /* Don't update atime */
285 #define ATTR_FLAG_APPEND 4 /* Append-only file */
286 #define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */
287 #define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */
289 #define ATTR_FLAG_BARRIER 512 /* Barrier for chroot() */
290 #define ATTR_FLAG_IUNLINK 1024 /* Immutable unlink */
293 * Includes for diskquotas.
295 #include <linux/quota.h>
298 * oh the beauties of C type declarations.
301 struct address_space;
302 struct writeback_control;
305 struct address_space_operations {
306 int (*writepage)(struct page *page, struct writeback_control *wbc);
307 int (*readpage)(struct file *, struct page *);
308 int (*sync_page)(struct page *);
310 /* Write back some dirty pages from this mapping. */
311 int (*writepages)(struct address_space *, struct writeback_control *);
313 /* Set a page dirty */
314 int (*set_page_dirty)(struct page *page);
316 int (*readpages)(struct file *filp, struct address_space *mapping,
317 struct list_head *pages, unsigned nr_pages);
320 * ext3 requires that a successful prepare_write() call be followed
321 * by a commit_write() call - they must be balanced
323 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
324 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
325 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
326 sector_t (*bmap)(struct address_space *, sector_t);
327 int (*invalidatepage) (struct page *, unsigned long);
328 int (*releasepage) (struct page *, int);
329 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
330 loff_t offset, unsigned long nr_segs);
333 struct backing_dev_info;
334 struct address_space {
335 struct inode *host; /* owner: inode, block_device */
336 struct radix_tree_root page_tree; /* radix tree of all pages */
337 spinlock_t tree_lock; /* and spinlock protecting it */
338 unsigned long nrpages; /* number of total pages */
339 pgoff_t writeback_index;/* writeback starts here */
340 struct address_space_operations *a_ops; /* methods */
341 struct list_head i_mmap; /* list of private mappings */
342 struct list_head i_mmap_shared; /* list of shared mappings */
343 struct semaphore i_shared_sem; /* protect both above lists */
344 atomic_t truncate_count; /* Cover race condition with truncate */
345 unsigned long flags; /* error bits/gfp mask */
346 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
347 spinlock_t private_lock; /* for use by the address_space */
348 struct list_head private_list; /* ditto */
349 struct address_space *assoc_mapping; /* ditto */
352 struct block_device {
353 dev_t bd_dev; /* not a kdev_t - it's a search key */
354 struct inode * bd_inode; /* will die */
356 struct semaphore bd_sem; /* open/close mutex */
357 struct semaphore bd_mount_sem; /* mount mutex */
358 struct list_head bd_inodes;
361 struct block_device * bd_contains;
362 unsigned bd_block_size;
363 struct hd_struct * bd_part;
364 unsigned bd_part_count;
366 struct gendisk * bd_disk;
367 struct list_head bd_list;
369 * Private data. You must have bd_claim'ed the block_device
370 * to use this. NOTE: bd_claim allows an owner to claim
371 * the same device multiple times, the owner must take special
372 * care to not mess up bd_private for that case.
374 unsigned long bd_private;
378 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
381 #define PAGECACHE_TAG_DIRTY 0
382 #define PAGECACHE_TAG_WRITEBACK 1
384 int mapping_tagged(struct address_space *mapping, int tag);
387 * Might pages of this file be mapped into userspace?
389 static inline int mapping_mapped(struct address_space *mapping)
391 return !list_empty(&mapping->i_mmap) ||
392 !list_empty(&mapping->i_mmap_shared);
396 * Might pages of this file have been modified in userspace?
397 * Note that i_mmap_shared holds all the VM_SHARED vmas: do_mmap_pgoff
398 * marks vma as VM_SHARED if it is shared, and the file was opened for
399 * writing i.e. vma may be mprotected writable even if now readonly.
401 static inline int mapping_writably_mapped(struct address_space *mapping)
403 return !list_empty(&mapping->i_mmap_shared);
407 * Use sequence counter to get consistent i_size on 32-bit processors.
409 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
410 #include <linux/seqlock.h>
411 #define __NEED_I_SIZE_ORDERED
412 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
414 #define i_size_ordered_init(inode) do { } while (0)
418 struct hlist_node i_hash;
419 struct list_head i_list;
420 struct list_head i_dentry;
424 unsigned int i_nlink;
430 struct timespec i_atime;
431 struct timespec i_mtime;
432 struct timespec i_ctime;
433 unsigned int i_blkbits;
434 unsigned long i_blksize;
435 unsigned long i_version;
436 unsigned long i_blocks;
437 unsigned short i_bytes;
438 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
439 struct semaphore i_sem;
440 struct rw_semaphore i_alloc_sem;
441 struct inode_operations *i_op;
442 struct file_operations *i_fop; /* former ->i_op->default_file_ops */
443 struct super_block *i_sb;
444 struct file_lock *i_flock;
445 struct address_space *i_mapping;
446 struct address_space i_data;
448 struct dquot *i_dquot[MAXQUOTAS];
450 /* These three should probably be a union */
451 struct list_head i_devices;
452 struct pipe_inode_info *i_pipe;
453 struct block_device *i_bdev;
457 unsigned long i_dnotify_mask; /* Directory notify events */
458 struct dnotify_struct *i_dnotify; /* for directory notifications */
460 unsigned long i_state;
461 unsigned long dirtied_when; /* jiffies of first dirtying */
463 unsigned int i_flags;
464 unsigned char i_sock;
466 atomic_t i_writecount;
472 #ifdef __NEED_I_SIZE_ORDERED
473 seqcount_t i_size_seqcount;
478 * NOTE: in a 32bit arch with a preemptable kernel and
479 * an UP compile the i_size_read/write must be atomic
480 * with respect to the local cpu (unlike with preempt disabled),
481 * but they don't need to be atomic with respect to other cpus like in
482 * true SMP (so they need either to either locally disable irq around
483 * the read or for example on x86 they can be still implemented as a
484 * cmpxchg8b without the need of the lock prefix). For SMP compiles
485 * and 64bit archs it makes no difference if preempt is enabled or not.
487 static inline loff_t i_size_read(struct inode *inode)
489 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
494 seq = read_seqcount_begin(&inode->i_size_seqcount);
495 i_size = inode->i_size;
496 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
498 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
502 i_size = inode->i_size;
506 return inode->i_size;
511 static inline void i_size_write(struct inode *inode, loff_t i_size)
513 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
514 write_seqcount_begin(&inode->i_size_seqcount);
515 inode->i_size = i_size;
516 write_seqcount_end(&inode->i_size_seqcount);
517 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
519 inode->i_size = i_size;
522 inode->i_size = i_size;
526 static inline unsigned iminor(struct inode *inode)
528 return MINOR(inode->i_rdev);
531 static inline unsigned imajor(struct inode *inode)
533 return MAJOR(inode->i_rdev);
536 extern struct block_device *I_BDEV(struct inode *inode);
539 rwlock_t lock; /* protects pid, uid, euid fields */
540 int pid; /* pid or -pgrp where SIGIO should be sent */
541 uid_t uid, euid; /* uid/euid of process setting the owner */
542 int signum; /* posix.1b rt signal to be delivered on IO */
547 * Track a single file's readahead state
549 struct file_ra_state {
550 unsigned long start; /* Current window */
552 unsigned long next_size; /* Next window size */
553 unsigned long prev_page; /* Cache last read() position */
554 unsigned long ahead_start; /* Ahead window */
555 unsigned long ahead_size;
556 unsigned long serial_cnt; /* measure of sequentiality */
557 unsigned long average; /* another measure of sequentiality */
558 unsigned long ra_pages; /* Maximum readahead window */
559 unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
560 unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
564 struct list_head f_list;
565 struct dentry *f_dentry;
566 struct vfsmount *f_vfsmnt;
567 struct file_operations *f_op;
569 unsigned int f_flags;
572 struct fown_struct f_owner;
573 unsigned int f_uid, f_gid;
575 struct file_ra_state f_ra;
577 unsigned long f_version;
580 /* needed for tty driver, and maybe others */
584 /* Used by fs/eventpoll.c to link all the hooks to this file */
585 struct list_head f_ep_links;
586 spinlock_t f_ep_lock;
587 #endif /* #ifdef CONFIG_EPOLL */
588 struct address_space *f_mapping;
590 extern spinlock_t files_lock;
591 #define file_list_lock() spin_lock(&files_lock);
592 #define file_list_unlock() spin_unlock(&files_lock);
594 #define get_file(x) atomic_inc(&(x)->f_count)
595 #define file_count(x) atomic_read(&(x)->f_count)
597 /* Initialize and open a private file and allocate its security structure. */
598 extern int open_private_file(struct file *, struct dentry *, int);
599 /* Release a private file and free its security structure. */
600 extern void close_private_file(struct file *file);
602 #define MAX_NON_LFS ((1UL<<31) - 1)
604 /* Page cache limit. The filesystems should put that into their s_maxbytes
605 limits, otherwise bad things can happen in VM. */
606 #if BITS_PER_LONG==32
607 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
608 #elif BITS_PER_LONG==64
609 #define MAX_LFS_FILESIZE 0x7fffffffffffffff
614 #define FL_ACCESS 8 /* not trying to lock, just looking */
615 #define FL_LOCKD 16 /* lock held by rpc.lockd */
616 #define FL_LEASE 32 /* lease held on this file */
617 #define FL_SLEEP 128 /* A blocking lock */
620 * The POSIX file lock owner is determined by
621 * the "struct files_struct" in the thread group
622 * (or NULL for no owner - BSD locks).
624 * Lockd stuffs a "host" pointer into this.
626 typedef struct files_struct *fl_owner_t;
628 /* that will die - we need it for nfs_lock_info */
629 #include <linux/nfs_fs_i.h>
632 struct file_lock *fl_next; /* singly linked list for this inode */
633 struct list_head fl_link; /* doubly linked list of all locks */
634 struct list_head fl_block; /* circular list of blocked processes */
637 wait_queue_head_t fl_wait;
638 struct file *fl_file;
639 unsigned char fl_flags;
640 unsigned char fl_type;
644 void (*fl_notify)(struct file_lock *); /* unblock callback */
645 void (*fl_insert)(struct file_lock *); /* lock insertion callback */
646 void (*fl_remove)(struct file_lock *); /* lock removal callback */
648 struct fasync_struct * fl_fasync; /* for lease break notifications */
649 unsigned long fl_break_time; /* for nonblocking lease breaks */
652 struct nfs_lock_info nfs_fl;
656 /* The following constant reflects the upper bound of the file/locking space */
658 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
659 #define OFFSET_MAX INT_LIMIT(loff_t)
660 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
663 extern struct list_head file_lock_list;
665 #include <linux/fcntl.h>
667 extern long generic_file_fcntl(int fd, unsigned int cmd,
668 unsigned long arg, struct file *filp);
670 extern int fcntl_getlk(struct file *, struct flock __user *);
671 extern int fcntl_setlk(struct file *, unsigned int, struct flock __user *);
673 #if BITS_PER_LONG == 32
674 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
675 extern int fcntl_setlk64(struct file *, unsigned int, struct flock64 __user *);
678 extern void send_sigio(struct fown_struct *fown, int fd, int band);
679 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
680 extern int fcntl_getlease(struct file *filp);
683 extern void locks_init_lock(struct file_lock *);
684 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
685 extern void locks_remove_posix(struct file *, fl_owner_t);
686 extern void locks_remove_flock(struct file *);
687 extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
688 extern int posix_lock_file(struct file *, struct file_lock *);
689 extern void posix_block_lock(struct file_lock *, struct file_lock *);
690 extern void posix_unblock_lock(struct file *, struct file_lock *);
691 extern int posix_locks_deadlock(struct file_lock *, struct file_lock *);
692 extern int __break_lease(struct inode *inode, unsigned int flags);
693 extern void lease_get_mtime(struct inode *, struct timespec *time);
694 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
695 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
696 extern void steal_locks(fl_owner_t from);
698 struct fasync_struct {
701 struct fasync_struct *fa_next; /* singly linked list */
702 struct file *fa_file;
705 #define FASYNC_MAGIC 0x4601
707 /* SMP safe fasync helpers: */
708 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
709 /* can be called from interrupts */
710 extern void kill_fasync(struct fasync_struct **, int, int);
711 /* only for net: no internal synchronization */
712 extern void __kill_fasync(struct fasync_struct *, int, int);
714 extern int f_setown(struct file *filp, unsigned long arg, int force);
715 extern void f_delown(struct file *filp);
716 extern int send_sigurg(struct fown_struct *fown);
722 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
723 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
725 extern struct list_head super_blocks;
726 extern spinlock_t sb_lock;
728 #define sb_entry(list) list_entry((list), struct super_block, s_list)
729 #define S_BIAS (1<<30)
731 struct list_head s_list; /* Keep this first */
732 dev_t s_dev; /* search index; _not_ kdev_t */
733 unsigned long s_blocksize;
734 unsigned long s_old_blocksize;
735 unsigned char s_blocksize_bits;
736 unsigned char s_dirt;
737 unsigned long long s_maxbytes; /* Max file size */
738 struct file_system_type *s_type;
739 struct super_operations *s_op;
740 struct dquot_operations *dq_op;
741 struct quotactl_ops *s_qcop;
742 struct export_operations *s_export_op;
743 unsigned long s_flags;
744 unsigned long s_magic;
745 struct dentry *s_root;
746 struct rw_semaphore s_umount;
747 struct semaphore s_lock;
754 struct list_head s_dirty; /* dirty inodes */
755 struct list_head s_io; /* parked for writeback */
756 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
757 struct list_head s_files;
759 struct block_device *s_bdev;
760 struct list_head s_instances;
761 struct quota_info s_dquot; /* Diskquota specific options */
764 wait_queue_head_t s_wait_unfrozen;
766 char s_id[32]; /* Informational name */
768 void *s_fs_info; /* Filesystem private info */
771 * The next field is for VFS *only*. No filesystems have any business
772 * even looking at it. You had been warned.
774 struct semaphore s_vfs_rename_sem; /* Kludge */
778 * Snapshotting support.
786 #define vfs_check_frozen(sb, level) \
787 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
790 * Superblock locking.
792 static inline void lock_super(struct super_block * sb)
797 static inline void unlock_super(struct super_block * sb)
803 * VFS helper functions..
805 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
806 extern int vfs_mkdir(struct inode *, struct dentry *, int);
807 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
808 extern int vfs_symlink(struct inode *, struct dentry *, const char *);
809 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
810 extern int vfs_rmdir(struct inode *, struct dentry *);
811 extern int vfs_unlink(struct inode *, struct dentry *);
812 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
817 * NOTE! These match bits 12..15 of stat.st_mode
818 * (ie "(i_mode >> 12) & 15").
831 * This is the "filldir" function type, used by readdir() to let
832 * the kernel specify what kind of dirent layout it wants to have.
833 * This allows the kernel to read directories into kernel space or
834 * to have different dirent layouts depending on the binary type.
836 typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned);
838 struct block_device_operations {
839 int (*open) (struct inode *, struct file *);
840 int (*release) (struct inode *, struct file *);
841 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
842 int (*media_changed) (struct gendisk *);
843 int (*revalidate_disk) (struct gendisk *);
844 struct module *owner;
848 * "descriptor" for what we're up to with a read for sendfile().
849 * This allows us to use the same read code yet
850 * have multiple different users of the data that
851 * we read from a file.
853 * The simplest case just copies the data to user
863 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
867 * read, write, poll, fsync, readv, writev can be called
868 * without the big kernel lock held in all filesystems.
870 struct file_operations {
871 struct module *owner;
872 loff_t (*llseek) (struct file *, loff_t, int);
873 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
874 ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
875 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
876 ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);
877 int (*readdir) (struct file *, void *, filldir_t);
878 unsigned int (*poll) (struct file *, struct poll_table_struct *);
879 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
880 int (*mmap) (struct file *, struct vm_area_struct *);
881 int (*open) (struct inode *, struct file *);
882 int (*flush) (struct file *);
883 int (*release) (struct inode *, struct file *);
884 int (*fsync) (struct file *, struct dentry *, int datasync);
885 int (*aio_fsync) (struct kiocb *, int datasync);
886 int (*fasync) (int, struct file *, int);
887 int (*lock) (struct file *, int, struct file_lock *);
888 ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
889 ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
890 ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void __user *);
891 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
892 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
893 long (*fcntl)(int fd, unsigned int cmd,
894 unsigned long arg, struct file *filp);
897 struct inode_operations {
898 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
899 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
900 int (*link) (struct dentry *,struct inode *,struct dentry *);
901 int (*unlink) (struct inode *,struct dentry *);
902 int (*symlink) (struct inode *,struct dentry *,const char *);
903 int (*mkdir) (struct inode *,struct dentry *,int);
904 int (*rmdir) (struct inode *,struct dentry *);
905 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
906 int (*rename) (struct inode *, struct dentry *,
907 struct inode *, struct dentry *);
908 int (*readlink) (struct dentry *, char __user *,int);
909 int (*follow_link) (struct dentry *, struct nameidata *);
910 void (*truncate) (struct inode *);
911 int (*permission) (struct inode *, int, struct nameidata *);
912 int (*setattr) (struct dentry *, struct iattr *);
913 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
914 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
915 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
916 ssize_t (*listxattr) (struct dentry *, char *, size_t);
917 int (*removexattr) (struct dentry *, const char *);
922 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
923 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
924 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
925 unsigned long, loff_t *);
926 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
927 unsigned long, loff_t *);
930 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
931 * without the big kernel lock held in all filesystems.
933 struct super_operations {
934 struct inode *(*alloc_inode)(struct super_block *sb);
935 void (*destroy_inode)(struct inode *);
937 void (*read_inode) (struct inode *);
939 void (*dirty_inode) (struct inode *);
940 void (*write_inode) (struct inode *, int);
941 void (*put_inode) (struct inode *);
942 void (*drop_inode) (struct inode *);
943 void (*delete_inode) (struct inode *);
944 void (*put_super) (struct super_block *);
945 void (*write_super) (struct super_block *);
946 int (*sync_fs)(struct super_block *sb, int wait);
947 void (*write_super_lockfs) (struct super_block *);
948 void (*unlockfs) (struct super_block *);
949 int (*statfs) (struct super_block *, struct kstatfs *);
950 int (*remount_fs) (struct super_block *, int *, char *);
951 void (*clear_inode) (struct inode *);
952 void (*umount_begin) (struct super_block *);
954 int (*show_options)(struct seq_file *, struct vfsmount *);
957 /* Inode state bits. Protected by inode_lock. */
958 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
959 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
960 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
966 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
968 extern void __mark_inode_dirty(struct inode *, int);
969 static inline void mark_inode_dirty(struct inode *inode)
971 __mark_inode_dirty(inode, I_DIRTY);
974 static inline void mark_inode_dirty_sync(struct inode *inode)
976 __mark_inode_dirty(inode, I_DIRTY_SYNC);
979 static inline void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
981 /* per-mountpoint checks will go here */
982 update_atime(dentry->d_inode);
985 static inline void file_accessed(struct file *file)
987 touch_atime(file->f_vfsmnt, file->f_dentry);
990 int sync_inode(struct inode *inode, struct writeback_control *wbc);
993 * &export_operations - for nfsd to communicate with file systems
994 * decode_fh: decode a file handle fragment and return a &struct dentry
995 * encode_fh: encode a file handle fragment from a dentry
996 * get_name: find the name for a given inode in a given directory
997 * get_parent: find the parent of a given directory
998 * get_dentry: find a dentry for the inode given a file handle sub-fragment
1001 * The export_operations structure provides a means for nfsd to communicate
1002 * with a particular exported file system - particularly enabling nfsd and
1003 * the filesystem to co-operate when dealing with file handles.
1005 * export_operations contains two basic operation for dealing with file handles,
1006 * decode_fh() and encode_fh(), and allows for some other operations to be defined
1007 * which standard helper routines use to get specific information from the
1010 * nfsd encodes information use to determine which filesystem a filehandle
1011 * applies to in the initial part of the file handle. The remainder, termed a
1012 * file handle fragment, is controlled completely by the filesystem.
1013 * The standard helper routines assume that this fragment will contain one or two
1014 * sub-fragments, one which identifies the file, and one which may be used to
1015 * identify the (a) directory containing the file.
1017 * In some situations, nfsd needs to get a dentry which is connected into a
1018 * specific part of the file tree. To allow for this, it passes the function
1019 * acceptable() together with a @context which can be used to see if the dentry
1020 * is acceptable. As there can be multiple dentrys for a given file, the filesystem
1021 * should check each one for acceptability before looking for the next. As soon
1022 * as an acceptable one is found, it should be returned.
1025 * @decode_fh is given a &struct super_block (@sb), a file handle fragment (@fh, @fh_len)
1026 * and an acceptability testing function (@acceptable, @context). It should return
1027 * a &struct dentry which refers to the same file that the file handle fragment refers
1028 * to, and which passes the acceptability test. If it cannot, it should return
1029 * a %NULL pointer if the file was found but no acceptable &dentries were available, or
1030 * a %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or %ENOMEM).
1033 * @encode_fh should store in the file handle fragment @fh (using at most @max_len bytes)
1034 * information that can be used by @decode_fh to recover the file refered to by the
1035 * &struct dentry @de. If the @connectable flag is set, the encode_fh() should store
1036 * sufficient information so that a good attempt can be made to find not only
1037 * the file but also it's place in the filesystem. This typically means storing
1038 * a reference to de->d_parent in the filehandle fragment.
1039 * encode_fh() should return the number of bytes stored or a negative error code
1043 * @get_name should find a name for the given @child in the given @parent directory.
1044 * The name should be stored in the @name (with the understanding that it is already
1045 * pointing to a a %NAME_MAX+1 sized buffer. get_name() should return %0 on success,
1046 * a negative error code or error.
1047 * @get_name will be called without @parent->i_sem held.
1050 * @get_parent should find the parent directory for the given @child which is also
1051 * a directory. In the event that it cannot be found, or storage space cannot be
1052 * allocated, a %ERR_PTR should be returned.
1055 * Given a &super_block (@sb) and a pointer to a file-system specific inode identifier,
1056 * possibly an inode number, (@inump) get_dentry() should find the identified inode and
1057 * return a dentry for that inode.
1058 * Any suitable dentry can be returned including, if necessary, a new dentry created
1059 * with d_alloc_root. The caller can then find any other extant dentrys by following the
1060 * d_alias links. If a new dentry was created using d_alloc_root, DCACHE_NFSD_DISCONNECTED
1061 * should be set, and the dentry should be d_rehash()ed.
1063 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code can be returned.
1064 * The @inump will be whatever was passed to nfsd_find_fh_dentry() in either the
1065 * @obj or @parent parameters.
1068 * get_parent is called with child->d_inode->i_sem down
1069 * get_name is not (which is possibly inconsistent)
1072 struct export_operations {
1073 struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
1074 int (*acceptable)(void *context, struct dentry *de),
1076 int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
1079 /* the following are only called from the filesystem itself */
1080 int (*get_name)(struct dentry *parent, char *name,
1081 struct dentry *child);
1082 struct dentry * (*get_parent)(struct dentry *child);
1083 struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
1085 /* This is set by the exporting module to a standard helper */
1086 struct dentry * (*find_exported_dentry)(
1087 struct super_block *sb, void *obj, void *parent,
1088 int (*acceptable)(void *context, struct dentry *de),
1095 struct file_system_type {
1098 struct super_block *(*get_sb) (struct file_system_type *, int,
1099 const char *, void *);
1100 void (*kill_sb) (struct super_block *);
1101 struct module *owner;
1102 struct file_system_type * next;
1103 struct list_head fs_supers;
1106 struct super_block *get_sb_bdev(struct file_system_type *fs_type,
1107 int flags, const char *dev_name, void *data,
1108 int (*fill_super)(struct super_block *, void *, int));
1109 struct super_block *get_sb_single(struct file_system_type *fs_type,
1110 int flags, void *data,
1111 int (*fill_super)(struct super_block *, void *, int));
1112 struct super_block *get_sb_nodev(struct file_system_type *fs_type,
1113 int flags, void *data,
1114 int (*fill_super)(struct super_block *, void *, int));
1115 void generic_shutdown_super(struct super_block *sb);
1116 void kill_block_super(struct super_block *sb);
1117 void kill_anon_super(struct super_block *sb);
1118 void kill_litter_super(struct super_block *sb);
1119 void deactivate_super(struct super_block *sb);
1120 int set_anon_super(struct super_block *s, void *data);
1121 struct super_block *sget(struct file_system_type *type,
1122 int (*test)(struct super_block *,void *),
1123 int (*set)(struct super_block *,void *),
1125 struct super_block *get_sb_pseudo(struct file_system_type *, char *,
1126 struct super_operations *ops, unsigned long);
1127 void unnamed_dev_init(void);
1129 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1130 #define fops_get(fops) \
1131 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1132 #define fops_put(fops) \
1133 do { if (fops) module_put((fops)->owner); } while(0)
1135 extern int register_filesystem(struct file_system_type *);
1136 extern int unregister_filesystem(struct file_system_type *);
1137 extern struct vfsmount *kern_mount(struct file_system_type *);
1138 extern int may_umount(struct vfsmount *);
1139 extern long do_mount(char *, char *, char *, unsigned long, void *);
1141 extern int vfs_statfs(struct super_block *, struct kstatfs *);
1143 /* Return value for VFS lock functions - tells locks.c to lock conventionally
1144 * REALLY kosha for root NFS and nfs_lock
1146 #define LOCK_USE_CLNT 1
1148 #define FLOCK_VERIFY_READ 1
1149 #define FLOCK_VERIFY_WRITE 2
1151 extern int locks_mandatory_locked(struct inode *);
1152 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1155 * Candidates for mandatory locking have the setgid bit set
1156 * but no group execute bit - an otherwise meaningless combination.
1158 #define MANDATORY_LOCK(inode) \
1159 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1161 static inline int locks_verify_locked(struct inode *inode)
1163 if (MANDATORY_LOCK(inode))
1164 return locks_mandatory_locked(inode);
1168 static inline int locks_verify_area(int read_write, struct inode *inode,
1169 struct file *filp, loff_t offset,
1172 if (inode->i_flock && MANDATORY_LOCK(inode))
1173 return locks_mandatory_area(read_write, inode, filp, offset, count);
1177 static inline int locks_verify_truncate(struct inode *inode,
1181 if (inode->i_flock && MANDATORY_LOCK(inode))
1182 return locks_mandatory_area(
1183 FLOCK_VERIFY_WRITE, inode, filp,
1184 size < inode->i_size ? size : inode->i_size,
1185 (size < inode->i_size ? inode->i_size - size
1186 : size - inode->i_size)
1191 static inline int break_lease(struct inode *inode, unsigned int mode)
1194 return __break_lease(inode, mode);
1200 extern int do_truncate(struct dentry *, loff_t start);
1201 extern struct file *filp_open(const char *, int, int);
1202 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1203 extern int filp_close(struct file *, fl_owner_t id);
1204 extern char * getname(const char __user *);
1207 extern void vfs_caches_init(unsigned long);
1209 #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
1210 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1211 #ifndef CONFIG_AUDITSYSCALL
1212 #define putname(name) __putname(name)
1214 #define putname(name) \
1216 if (unlikely(current->audit_context)) \
1217 audit_putname(name); \
1223 extern int register_blkdev(unsigned int, const char *);
1224 extern int unregister_blkdev(unsigned int, const char *);
1225 extern struct block_device *bdget(dev_t);
1226 extern void bd_set_size(struct block_device *, loff_t size);
1227 extern void bd_forget(struct inode *inode);
1228 extern void bdput(struct block_device *);
1229 extern int blkdev_open(struct inode *, struct file *);
1230 extern struct block_device *open_by_devnum(dev_t, unsigned);
1231 extern struct file_operations def_blk_fops;
1232 extern struct address_space_operations def_blk_aops;
1233 extern struct file_operations def_chr_fops;
1234 extern struct file_operations bad_sock_fops;
1235 extern struct file_operations def_fifo_fops;
1236 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1237 extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
1238 extern int blkdev_get(struct block_device *, mode_t, unsigned);
1239 extern int blkdev_put(struct block_device *);
1240 extern int bd_claim(struct block_device *, void *);
1241 extern void bd_release(struct block_device *);
1242 extern void blk_run_queues(void);
1245 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, char *);
1246 extern int register_chrdev_region(dev_t, unsigned, char *);
1247 extern int register_chrdev(unsigned int, const char *,
1248 struct file_operations *);
1249 extern int unregister_chrdev(unsigned int, const char *);
1250 extern void unregister_chrdev_region(dev_t, unsigned);
1251 extern int chrdev_open(struct inode *, struct file *);
1253 /* fs/block_dev.c */
1254 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1255 extern const char *__bdevname(dev_t, char *buffer);
1256 extern const char *bdevname(struct block_device *bdev, char *buffer);
1257 extern struct block_device *lookup_bdev(const char *);
1258 extern struct block_device *open_bdev_excl(const char *, int, void *);
1259 extern void close_bdev_excl(struct block_device *);
1261 extern void init_special_inode(struct inode *, umode_t, dev_t);
1263 /* Invalid inode operations -- fs/bad_inode.c */
1264 extern void make_bad_inode(struct inode *);
1265 extern int is_bad_inode(struct inode *);
1267 extern struct file_operations read_fifo_fops;
1268 extern struct file_operations write_fifo_fops;
1269 extern struct file_operations rdwr_fifo_fops;
1270 extern struct file_operations read_pipe_fops;
1271 extern struct file_operations write_pipe_fops;
1272 extern struct file_operations rdwr_pipe_fops;
1274 extern int fs_may_remount_ro(struct super_block *);
1277 * return READ, READA, or WRITE
1279 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1282 * return data direction, READ or WRITE
1284 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1286 extern int check_disk_change(struct block_device *);
1287 extern int invalidate_inodes(struct super_block *);
1288 extern int __invalidate_device(struct block_device *, int);
1289 extern int invalidate_partition(struct gendisk *, int);
1290 unsigned long invalidate_mapping_pages(struct address_space *mapping,
1291 pgoff_t start, pgoff_t end);
1292 unsigned long invalidate_inode_pages(struct address_space *mapping);
1293 static inline void invalidate_remote_inode(struct inode *inode)
1295 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1296 S_ISLNK(inode->i_mode))
1297 invalidate_inode_pages(inode->i_mapping);
1299 extern void invalidate_inode_pages2(struct address_space *mapping);
1300 extern void write_inode_now(struct inode *, int);
1301 extern int filemap_fdatawrite(struct address_space *);
1302 extern int filemap_flush(struct address_space *);
1303 extern int filemap_fdatawait(struct address_space *);
1304 extern int filemap_write_and_wait(struct address_space *mapping);
1305 extern void sync_supers(void);
1306 extern void sync_filesystems(int wait);
1307 extern void emergency_sync(void);
1308 extern void emergency_remount(void);
1309 extern int do_remount_sb(struct super_block *sb, int flags,
1310 void *data, int force);
1311 extern sector_t bmap(struct inode *, sector_t);
1312 extern int setattr_mask(unsigned int);
1313 extern int notify_change(struct dentry *, struct iattr *);
1314 extern int permission(struct inode *, int, struct nameidata *);
1315 extern int vfs_permission(struct inode *, int);
1316 extern int get_write_access(struct inode *);
1317 extern int deny_write_access(struct file *);
1318 static inline void put_write_access(struct inode * inode)
1320 atomic_dec(&inode->i_writecount);
1322 static inline void allow_write_access(struct file *file)
1325 atomic_inc(&file->f_dentry->d_inode->i_writecount);
1327 extern int do_pipe(int *);
1329 extern int open_namei(const char *, int, int, struct nameidata *);
1330 extern int may_open(struct nameidata *, int, int);
1332 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1333 extern struct file * open_exec(const char *);
1335 /* fs/dcache.c -- generic fs support functions */
1336 extern int is_subdir(struct dentry *, struct dentry *);
1337 extern ino_t find_inode_number(struct dentry *, struct qstr *);
1339 #include <linux/err.h>
1341 /* needed for stackable file system support */
1342 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1344 extern void inode_init_once(struct inode *);
1345 extern void iput(struct inode *);
1346 extern struct inode * igrab(struct inode *);
1347 extern ino_t iunique(struct super_block *, ino_t);
1348 extern int inode_needs_sync(struct inode *inode);
1349 extern void generic_delete_inode(struct inode *inode);
1351 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1352 int (*test)(struct inode *, void *), void *data);
1353 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1355 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1356 extern struct inode * iget_locked(struct super_block *, unsigned long);
1357 extern void unlock_new_inode(struct inode *);
1359 static inline struct inode *iget(struct super_block *sb, unsigned long ino)
1361 struct inode *inode = iget_locked(sb, ino);
1363 if (inode && (inode->i_state & I_NEW)) {
1364 sb->s_op->read_inode(inode);
1365 unlock_new_inode(inode);
1371 extern void __iget(struct inode * inode);
1372 extern void clear_inode(struct inode *);
1373 extern void destroy_inode(struct inode *);
1374 extern struct inode *new_inode(struct super_block *);
1375 extern int remove_suid(struct dentry *);
1377 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1378 extern void remove_inode_hash(struct inode *);
1379 static inline void insert_inode_hash(struct inode *inode) {
1380 __insert_inode_hash(inode, inode->i_ino);
1383 extern struct file * get_empty_filp(void);
1384 extern void file_move(struct file *f, struct list_head *list);
1385 extern void file_kill(struct file *f);
1387 extern void submit_bio(int, struct bio *);
1388 extern int bdev_read_only(struct block_device *);
1389 extern int set_blocksize(struct block_device *, int);
1390 extern int sb_set_blocksize(struct super_block *, int);
1391 extern int sb_min_blocksize(struct super_block *, int);
1393 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1394 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1395 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1396 extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1397 extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *);
1398 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
1399 extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *);
1400 extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t);
1401 extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *);
1402 extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t);
1403 extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1404 unsigned long, loff_t *);
1405 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1406 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1407 ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
1408 unsigned long nr_segs, loff_t *ppos);
1409 extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void __user *);
1410 extern void do_generic_mapping_read(struct address_space *mapping,
1411 struct file_ra_state *, struct file *,
1412 loff_t *, read_descriptor_t *, read_actor_t);
1414 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1415 extern ssize_t generic_file_direct_IO(int rw, struct kiocb *iocb,
1416 const struct iovec *iov, loff_t offset, unsigned long nr_segs);
1417 extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov,
1418 unsigned long nr_segs, loff_t *ppos);
1419 ssize_t generic_file_writev(struct file *filp, const struct iovec *iov,
1420 unsigned long nr_segs, loff_t *ppos);
1421 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1422 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1423 extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1424 extern int generic_file_open(struct inode * inode, struct file * filp);
1426 static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
1427 read_descriptor_t * desc,
1430 do_generic_mapping_read(filp->f_mapping,
1438 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1439 struct block_device *bdev, const struct iovec *iov, loff_t offset,
1440 unsigned long nr_segs, get_blocks_t get_blocks, dio_iodone_t end_io,
1441 int needs_special_locking);
1444 * For filesystems which need locking between buffered and direct access
1446 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1447 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1448 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1449 dio_iodone_t end_io)
1451 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1452 nr_segs, get_blocks, end_io, 1);
1455 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1456 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1457 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1458 dio_iodone_t end_io)
1460 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1461 nr_segs, get_blocks, end_io, 0);
1464 extern struct file_operations generic_ro_fops;
1466 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1468 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1469 extern int vfs_follow_link(struct nameidata *, const char *);
1470 extern int page_readlink(struct dentry *, char __user *, int);
1471 extern int page_follow_link(struct dentry *, struct nameidata *);
1472 extern int page_symlink(struct inode *inode, const char *symname, int len);
1473 extern struct inode_operations page_symlink_inode_operations;
1474 extern void generic_fillattr(struct inode *, struct kstat *);
1475 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1476 void inode_add_bytes(struct inode *inode, loff_t bytes);
1477 void inode_sub_bytes(struct inode *inode, loff_t bytes);
1478 loff_t inode_get_bytes(struct inode *inode);
1479 void inode_set_bytes(struct inode *inode, loff_t bytes);
1481 extern int vfs_readdir(struct file *, filldir_t, void *);
1483 extern int vfs_stat(char __user *, struct kstat *);
1484 extern int vfs_lstat(char __user *, struct kstat *);
1485 extern int vfs_fstat(unsigned int, struct kstat *);
1487 extern struct file_system_type *get_fs_type(const char *name);
1488 extern struct super_block *get_super(struct block_device *);
1489 extern struct super_block *user_get_super(dev_t);
1490 extern void drop_super(struct super_block *sb);
1492 extern int dcache_dir_open(struct inode *, struct file *);
1493 extern int dcache_dir_close(struct inode *, struct file *);
1494 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1495 extern int dcache_readdir(struct file *, void *, filldir_t);
1496 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1497 extern int simple_statfs(struct super_block *, struct kstatfs *);
1498 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1499 extern int simple_unlink(struct inode *, struct dentry *);
1500 extern int simple_rmdir(struct inode *, struct dentry *);
1501 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1502 extern int simple_sync_file(struct file *, struct dentry *, int);
1503 extern int simple_empty(struct dentry *);
1504 extern int simple_readpage(struct file *file, struct page *page);
1505 extern int simple_prepare_write(struct file *file, struct page *page,
1506 unsigned offset, unsigned to);
1507 extern int simple_commit_write(struct file *file, struct page *page,
1508 unsigned offset, unsigned to);
1510 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1511 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
1512 extern struct file_operations simple_dir_operations;
1513 extern struct inode_operations simple_dir_inode_operations;
1514 struct tree_descr { char *name; struct file_operations *ops; int mode; };
1515 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
1516 extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count);
1517 extern void simple_release_fs(struct vfsmount **mount, int *count);
1519 extern int inode_change_ok(struct inode *, struct iattr *);
1520 extern int inode_setattr(struct inode *, struct iattr *);
1522 extern void inode_update_time(struct inode *inode, int ctime_too);
1524 static inline ino_t parent_ino(struct dentry *dentry)
1528 spin_lock(&dentry->d_lock);
1529 res = dentry->d_parent->d_inode->i_ino;
1530 spin_unlock(&dentry->d_lock);
1535 extern int unshare_files(void);
1537 #ifdef CONFIG_SECURITY
1538 static inline char *alloc_secdata(void)
1540 return (char *)get_zeroed_page(GFP_KERNEL);
1543 static inline void free_secdata(void *secdata)
1545 free_page((unsigned long)secdata);
1548 static inline char *alloc_secdata(void)
1553 static inline void free_secdata(void *secdata)
1555 #endif /* CONFIG_SECURITY */
1557 #endif /* __KERNEL__ */
1558 #endif /* _LINUX_FS_H */