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 <linux/mount.h>
22 #include <asm/atomic.h>
26 struct pipe_inode_info;
27 struct poll_table_struct;
29 struct vm_area_struct;
33 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
34 * the file limit at runtime and only root can increase the per-process
35 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
36 * upper limit on files-per-process.
38 * Some programs (notably those using select()) may have to be
39 * recompiled to take full advantage of the new limits..
42 /* Fixed constants first: */
44 #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
45 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
47 #define BLOCK_SIZE_BITS 10
48 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
50 /* And dynamically-tunable limits and defaults: */
51 struct files_stat_struct {
52 int nr_files; /* read only */
53 int nr_free_files; /* read only */
54 int max_files; /* tunable */
56 extern struct files_stat_struct files_stat;
58 struct inodes_stat_t {
63 extern struct inodes_stat_t inodes_stat;
65 extern int leases_enable, dir_notify_enable, lease_break_time;
67 #define NR_FILE 8192 /* this can well be larger on a larger system */
68 #define NR_RESERVED_FILES 10 /* reserved for root */
79 /* Internal kernel extensions */
82 #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
88 #define READA 2 /* read-ahead - don't block if no resources */
89 #define SPECIAL 4 /* For non-blockdevice requests in request queue */
90 #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
91 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
97 /* public flags for file_system_type */
98 #define FS_REQUIRES_DEV 1
99 #define FS_BINARY_MOUNTDATA 2
100 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
101 #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
102 * as nfs_rename() will be cleaned up
105 * These are the fs-independent mount-flags: up to 32 flags are supported
107 #define MS_RDONLY 1 /* Mount read-only */
108 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
109 #define MS_NODEV 4 /* Disallow access to device special files */
110 #define MS_NOEXEC 8 /* Disallow program execution */
111 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
112 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
113 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
114 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
115 #define MS_NOATIME 1024 /* Do not update access times. */
116 #define MS_NODIRATIME 2048 /* Do not update directory access times */
120 #define MS_VERBOSE 32768
121 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
122 #define MS_ONE_SECOND (1<<17) /* fs has 1 sec a/m/ctime resolution */
123 #define MS_TAGXID (1<<24) /* tag inodes with context information */
124 #define MS_ACTIVE (1<<30)
125 #define MS_NOUSER (1<<31)
128 * Superblock flags that can be altered by MS_REMOUNT
130 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\
134 * Old magic mount flag and mask
136 #define MS_MGC_VAL 0xC0ED0000
137 #define MS_MGC_MSK 0xffff0000
139 /* Inode flags - they have nothing to superblock flags now */
141 #define S_SYNC 1 /* Writes are synced at once */
142 #define S_NOATIME 2 /* Do not update access times */
143 #define S_APPEND 4 /* Append-only file */
144 #define S_IMMUTABLE 8 /* Immutable file */
145 #define S_DEAD 16 /* removed, but still open directory */
146 #define S_NOQUOTA 32 /* Inode is not counted to quota */
147 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
148 #define S_NOCMTIME 128 /* Do not update file c/mtime */
149 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
150 #define S_BARRIER 512 /* Barrier for chroot() */
151 #define S_IUNLINK 1024 /* Immutable unlink */
154 * Note that nosuid etc flags are inode-specific: setting some file-system
155 * flags just means all the inodes inherit those flags by default. It might be
156 * possible to override it selectively if you really wanted to with some
157 * ioctl() that is not currently implemented.
159 * Exception: MS_RDONLY is always applied to the entire file system.
161 * Unfortunately, it is possible to change a filesystems flags with it mounted
162 * with files in use. This means that all of the inodes will not have their
163 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
164 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
166 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
168 #define IS_RDONLY(inode) __IS_FLG(inode, MS_RDONLY)
169 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
170 ((inode)->i_flags & S_SYNC))
171 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
172 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
173 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
175 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
176 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
177 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
178 #define IS_IUNLINK(inode) ((inode)->i_flags & S_IUNLINK)
179 #define IS_IXORUNLINK(inode) ((IS_IUNLINK(inode) ? S_IMMUTABLE : 0) ^ IS_IMMUTABLE(inode))
180 #define IS_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
181 #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
182 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
183 #define IS_ONE_SECOND(inode) __IS_FLG(inode, MS_ONE_SECOND)
185 #define IS_BARRIER(inode) (S_ISDIR((inode)->i_mode) && ((inode)->i_flags & S_BARRIER))
186 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
187 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
188 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
190 /* the read-only stuff doesn't really belong here, but any other place is
191 probably as bad and I don't want to create yet another include file. */
193 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
194 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
195 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
196 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
197 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
198 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
199 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
200 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
201 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
202 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
203 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
204 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
206 #define BLKPG _IO(0x12,105)/* See blkpg.h */
208 /* Some people are morons. Do not use sizeof! */
210 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
211 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
212 /* This was here just to show that the number is taken -
213 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
215 /* A jump here: 108-111 have been used for various private purposes. */
216 #define BLKBSZGET _IOR(0x12,112,size_t)
217 #define BLKBSZSET _IOW(0x12,113,size_t)
218 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
220 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
221 #define FIBMAP _IO(0x00,1) /* bmap access */
222 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
226 #include <linux/list.h>
227 #include <linux/radix-tree.h>
228 #include <linux/audit.h>
229 #include <linux/init.h>
230 #include <asm/semaphore.h>
231 #include <asm/byteorder.h>
233 /* Used to be a macro which just called the function, now just a function */
234 extern void update_atime (struct inode *);
236 extern void __init inode_init(unsigned long);
237 extern void __init inode_init_early(void);
238 extern void __init mnt_init(unsigned long);
239 extern void __init files_init(unsigned long);
242 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
243 struct buffer_head *bh_result, int create);
244 typedef int (get_blocks_t)(struct inode *inode, sector_t iblock,
245 unsigned long max_blocks,
246 struct buffer_head *bh_result, int create);
247 typedef void (dio_iodone_t)(struct inode *inode, loff_t offset,
248 ssize_t bytes, void *private);
251 * Attribute flags. These should be or-ed together to figure out what
258 #define ATTR_ATIME 16
259 #define ATTR_MTIME 32
260 #define ATTR_CTIME 64
261 #define ATTR_ATIME_SET 128
262 #define ATTR_MTIME_SET 256
263 #define ATTR_FORCE 512 /* Not a change, but a change it */
264 #define ATTR_ATTR_FLAG 1024
265 #define ATTR_KILL_SUID 2048
266 #define ATTR_KILL_SGID 4096
267 #define ATTR_XID 8192
270 * This is the Inode Attributes structure, used for notify_change(). It
271 * uses the above definitions as flags, to know which values have changed.
272 * Also, in this manner, a Filesystem can look at only the values it cares
273 * about. Basically, these are the attributes that the VFS layer can
274 * request to change from the FS layer.
276 * Derek Atkins <warlord@MIT.EDU> 94-10-20
279 unsigned int ia_valid;
285 struct timespec ia_atime;
286 struct timespec ia_mtime;
287 struct timespec ia_ctime;
288 unsigned int ia_attr_flags;
292 * This is the inode attributes flag definitions
294 #define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */
295 #define ATTR_FLAG_NOATIME 2 /* Don't update atime */
296 #define ATTR_FLAG_APPEND 4 /* Append-only file */
297 #define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */
298 #define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */
300 #define ATTR_FLAG_BARRIER 512 /* Barrier for chroot() */
301 #define ATTR_FLAG_IUNLINK 1024 /* Immutable unlink */
304 * Includes for diskquotas.
306 #include <linux/quota.h>
309 * oh the beauties of C type declarations.
312 struct address_space;
313 struct writeback_control;
316 struct address_space_operations {
317 int (*writepage)(struct page *page, struct writeback_control *wbc);
318 int (*readpage)(struct file *, struct page *);
319 int (*sync_page)(struct page *);
321 /* Write back some dirty pages from this mapping. */
322 int (*writepages)(struct address_space *, struct writeback_control *);
324 /* Set a page dirty */
325 int (*set_page_dirty)(struct page *page);
327 int (*readpages)(struct file *filp, struct address_space *mapping,
328 struct list_head *pages, unsigned nr_pages);
331 * ext3 requires that a successful prepare_write() call be followed
332 * by a commit_write() call - they must be balanced
334 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
335 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
336 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
337 sector_t (*bmap)(struct address_space *, sector_t);
338 int (*invalidatepage) (struct page *, unsigned long);
339 int (*releasepage) (struct page *, int);
340 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
341 loff_t offset, unsigned long nr_segs);
344 struct backing_dev_info;
345 struct address_space {
346 struct inode *host; /* owner: inode, block_device */
347 struct radix_tree_root page_tree; /* radix tree of all pages */
348 spinlock_t tree_lock; /* and spinlock protecting it */
349 unsigned long nrpages; /* number of total pages */
350 pgoff_t writeback_index;/* writeback starts here */
351 struct address_space_operations *a_ops; /* methods */
352 struct prio_tree_root i_mmap; /* tree of private mappings */
353 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
354 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
355 spinlock_t i_mmap_lock; /* protect tree, count, list */
356 atomic_t truncate_count; /* Cover race condition with truncate */
357 unsigned long flags; /* error bits/gfp mask */
358 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
359 spinlock_t private_lock; /* for use by the address_space */
360 struct list_head private_list; /* ditto */
361 struct address_space *assoc_mapping; /* ditto */
364 struct block_device {
365 dev_t bd_dev; /* not a kdev_t - it's a search key */
366 struct inode * bd_inode; /* will die */
368 struct semaphore bd_sem; /* open/close mutex */
369 struct semaphore bd_mount_sem; /* mount mutex */
370 struct list_head bd_inodes;
373 struct block_device * bd_contains;
374 unsigned bd_block_size;
375 struct hd_struct * bd_part;
376 /* number of times partitions within this device have been opened. */
377 unsigned bd_part_count;
379 struct gendisk * bd_disk;
380 struct list_head bd_list;
381 struct backing_dev_info *bd_inode_backing_dev_info;
383 * Private data. You must have bd_claim'ed the block_device
384 * to use this. NOTE: bd_claim allows an owner to claim
385 * the same device multiple times, the owner must take special
386 * care to not mess up bd_private for that case.
388 unsigned long bd_private;
392 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
395 #define PAGECACHE_TAG_DIRTY 0
396 #define PAGECACHE_TAG_WRITEBACK 1
398 int mapping_tagged(struct address_space *mapping, int tag);
401 * Might pages of this file be mapped into userspace?
403 static inline int mapping_mapped(struct address_space *mapping)
405 return !prio_tree_empty(&mapping->i_mmap) ||
406 !list_empty(&mapping->i_mmap_nonlinear);
410 * Might pages of this file have been modified in userspace?
411 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
412 * marks vma as VM_SHARED if it is shared, and the file was opened for
413 * writing i.e. vma may be mprotected writable even if now readonly.
415 static inline int mapping_writably_mapped(struct address_space *mapping)
417 return mapping->i_mmap_writable != 0;
421 * Use sequence counter to get consistent i_size on 32-bit processors.
423 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
424 #include <linux/seqlock.h>
425 #define __NEED_I_SIZE_ORDERED
426 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
428 #define i_size_ordered_init(inode) do { } while (0)
432 struct hlist_node i_hash;
433 struct list_head i_list;
434 struct list_head i_dentry;
438 unsigned int i_nlink;
444 struct timespec i_atime;
445 struct timespec i_mtime;
446 struct timespec i_ctime;
447 unsigned int i_blkbits;
448 unsigned long i_blksize;
449 unsigned long i_version;
450 unsigned long i_blocks;
451 unsigned short i_bytes;
452 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
453 struct semaphore i_sem;
454 struct rw_semaphore i_alloc_sem;
455 struct inode_operations *i_op;
456 struct file_operations *i_fop; /* former ->i_op->default_file_ops */
457 struct super_block *i_sb;
458 struct file_lock *i_flock;
459 struct address_space *i_mapping;
460 struct address_space i_data;
462 struct dquot *i_dquot[MAXQUOTAS];
464 /* These three should probably be a union */
465 struct list_head i_devices;
466 struct pipe_inode_info *i_pipe;
467 struct block_device *i_bdev;
471 unsigned long i_dnotify_mask; /* Directory notify events */
472 struct dnotify_struct *i_dnotify; /* for directory notifications */
474 unsigned long i_state;
475 unsigned long dirtied_when; /* jiffies of first dirtying */
477 unsigned int i_flags;
478 unsigned char i_sock;
480 atomic_t i_writecount;
486 #ifdef __NEED_I_SIZE_ORDERED
487 seqcount_t i_size_seqcount;
492 * NOTE: in a 32bit arch with a preemptable kernel and
493 * an UP compile the i_size_read/write must be atomic
494 * with respect to the local cpu (unlike with preempt disabled),
495 * but they don't need to be atomic with respect to other cpus like in
496 * true SMP (so they need either to either locally disable irq around
497 * the read or for example on x86 they can be still implemented as a
498 * cmpxchg8b without the need of the lock prefix). For SMP compiles
499 * and 64bit archs it makes no difference if preempt is enabled or not.
501 static inline loff_t i_size_read(struct inode *inode)
503 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
508 seq = read_seqcount_begin(&inode->i_size_seqcount);
509 i_size = inode->i_size;
510 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
512 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
516 i_size = inode->i_size;
520 return inode->i_size;
525 static inline void i_size_write(struct inode *inode, loff_t i_size)
527 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
528 write_seqcount_begin(&inode->i_size_seqcount);
529 inode->i_size = i_size;
530 write_seqcount_end(&inode->i_size_seqcount);
531 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
533 inode->i_size = i_size;
536 inode->i_size = i_size;
540 static inline unsigned iminor(struct inode *inode)
542 return MINOR(inode->i_rdev);
545 static inline unsigned imajor(struct inode *inode)
547 return MAJOR(inode->i_rdev);
550 extern struct block_device *I_BDEV(struct inode *inode);
553 rwlock_t lock; /* protects pid, uid, euid fields */
554 int pid; /* pid or -pgrp where SIGIO should be sent */
555 uid_t uid, euid; /* uid/euid of process setting the owner */
557 int signum; /* posix.1b rt signal to be delivered on IO */
561 * Track a single file's readahead state
563 struct file_ra_state {
564 unsigned long start; /* Current window */
566 unsigned long next_size; /* Next window size */
567 unsigned long prev_page; /* Cache last read() position */
568 unsigned long ahead_start; /* Ahead window */
569 unsigned long ahead_size;
570 unsigned long serial_cnt; /* measure of sequentiality */
571 unsigned long average; /* another measure of sequentiality */
572 unsigned long ra_pages; /* Maximum readahead window */
573 unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
574 unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
578 struct list_head f_list;
579 struct dentry *f_dentry;
580 struct vfsmount *f_vfsmnt;
581 struct file_operations *f_op;
583 unsigned int f_flags;
587 struct fown_struct f_owner;
588 unsigned int f_uid, f_gid;
589 struct file_ra_state f_ra;
591 unsigned long f_version;
594 /* needed for tty driver, and maybe others */
598 /* Used by fs/eventpoll.c to link all the hooks to this file */
599 struct list_head f_ep_links;
600 spinlock_t f_ep_lock;
601 #endif /* #ifdef CONFIG_EPOLL */
602 struct address_space *f_mapping;
604 extern spinlock_t files_lock;
605 #define file_list_lock() spin_lock(&files_lock);
606 #define file_list_unlock() spin_unlock(&files_lock);
608 #define get_file(x) atomic_inc(&(x)->f_count)
609 #define file_count(x) atomic_read(&(x)->f_count)
611 /* Initialize and open a private file and allocate its security structure. */
612 extern int open_private_file(struct file *, struct dentry *, int);
613 /* Release a private file and free its security structure. */
614 extern void close_private_file(struct file *file);
616 #define MAX_NON_LFS ((1UL<<31) - 1)
618 /* Page cache limit. The filesystems should put that into their s_maxbytes
619 limits, otherwise bad things can happen in VM. */
620 #if BITS_PER_LONG==32
621 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
622 #elif BITS_PER_LONG==64
623 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
628 #define FL_ACCESS 8 /* not trying to lock, just looking */
629 #define FL_LOCKD 16 /* lock held by rpc.lockd */
630 #define FL_LEASE 32 /* lease held on this file */
631 #define FL_SLEEP 128 /* A blocking lock */
634 * The POSIX file lock owner is determined by
635 * the "struct files_struct" in the thread group
636 * (or NULL for no owner - BSD locks).
638 * Lockd stuffs a "host" pointer into this.
640 typedef struct files_struct *fl_owner_t;
642 /* that will die - we need it for nfs_lock_info */
643 #include <linux/nfs_fs_i.h>
646 struct file_lock *fl_next; /* singly linked list for this inode */
647 struct list_head fl_link; /* doubly linked list of all locks */
648 struct list_head fl_block; /* circular list of blocked processes */
651 wait_queue_head_t fl_wait;
652 struct file *fl_file;
653 unsigned char fl_flags;
654 unsigned char fl_type;
658 void (*fl_notify)(struct file_lock *); /* unblock callback */
659 void (*fl_insert)(struct file_lock *); /* lock insertion callback */
660 void (*fl_remove)(struct file_lock *); /* lock removal callback */
662 struct fasync_struct * fl_fasync; /* for lease break notifications */
663 unsigned long fl_break_time; /* for nonblocking lease breaks */
666 struct nfs_lock_info nfs_fl;
670 /* The following constant reflects the upper bound of the file/locking space */
672 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
673 #define OFFSET_MAX INT_LIMIT(loff_t)
674 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
677 extern struct list_head file_lock_list;
679 #include <linux/fcntl.h>
681 extern int fcntl_getlk(struct file *, struct flock __user *);
682 extern int fcntl_setlk(struct file *, unsigned int, struct flock __user *);
684 #if BITS_PER_LONG == 32
685 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
686 extern int fcntl_setlk64(struct file *, unsigned int, struct flock64 __user *);
689 extern void send_sigio(struct fown_struct *fown, int fd, int band);
690 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
691 extern int fcntl_getlease(struct file *filp);
694 extern void locks_init_lock(struct file_lock *);
695 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
696 extern void locks_remove_posix(struct file *, fl_owner_t);
697 extern void locks_remove_flock(struct file *);
698 extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
699 extern int posix_lock_file(struct file *, struct file_lock *);
700 extern void posix_block_lock(struct file_lock *, struct file_lock *);
701 extern void posix_unblock_lock(struct file *, struct file_lock *);
702 extern int posix_locks_deadlock(struct file_lock *, struct file_lock *);
703 extern int __break_lease(struct inode *inode, unsigned int flags);
704 extern void lease_get_mtime(struct inode *, struct timespec *time);
705 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
706 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
707 extern void steal_locks(fl_owner_t from);
709 struct fasync_struct {
712 struct fasync_struct *fa_next; /* singly linked list */
713 struct file *fa_file;
716 #define FASYNC_MAGIC 0x4601
718 /* SMP safe fasync helpers: */
719 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
720 /* can be called from interrupts */
721 extern void kill_fasync(struct fasync_struct **, int, int);
722 /* only for net: no internal synchronization */
723 extern void __kill_fasync(struct fasync_struct *, int, int);
725 extern int f_setown(struct file *filp, unsigned long arg, int force);
726 extern void f_delown(struct file *filp);
727 extern int send_sigurg(struct fown_struct *fown);
733 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
734 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
735 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
737 extern struct list_head super_blocks;
738 extern spinlock_t sb_lock;
740 #define sb_entry(list) list_entry((list), struct super_block, s_list)
741 #define S_BIAS (1<<30)
743 struct list_head s_list; /* Keep this first */
744 dev_t s_dev; /* search index; _not_ kdev_t */
745 unsigned long s_blocksize;
746 unsigned long s_old_blocksize;
747 unsigned char s_blocksize_bits;
748 unsigned char s_dirt;
749 unsigned long long s_maxbytes; /* Max file size */
750 struct file_system_type *s_type;
751 struct super_operations *s_op;
752 struct dquot_operations *dq_op;
753 struct quotactl_ops *s_qcop;
754 struct export_operations *s_export_op;
755 unsigned long s_flags;
756 unsigned long s_magic;
757 struct dentry *s_root;
758 struct rw_semaphore s_umount;
759 struct semaphore s_lock;
766 struct list_head s_dirty; /* dirty inodes */
767 struct list_head s_io; /* parked for writeback */
768 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
769 struct list_head s_files;
771 struct block_device *s_bdev;
772 struct list_head s_instances;
773 struct quota_info s_dquot; /* Diskquota specific options */
776 wait_queue_head_t s_wait_unfrozen;
778 char s_id[32]; /* Informational name */
780 void *s_fs_info; /* Filesystem private info */
783 * The next field is for VFS *only*. No filesystems have any business
784 * even looking at it. You had been warned.
786 struct semaphore s_vfs_rename_sem; /* Kludge */
790 * Snapshotting support.
798 #define vfs_check_frozen(sb, level) \
799 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
802 * Superblock locking.
804 static inline void lock_super(struct super_block * sb)
809 static inline void unlock_super(struct super_block * sb)
815 * VFS helper functions..
817 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
818 extern int vfs_mkdir(struct inode *, struct dentry *, int);
819 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
820 extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
821 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
822 extern int vfs_rmdir(struct inode *, struct dentry *);
823 extern int vfs_unlink(struct inode *, struct dentry *);
824 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
829 * NOTE! These match bits 12..15 of stat.st_mode
830 * (ie "(i_mode >> 12) & 15").
843 * This is the "filldir" function type, used by readdir() to let
844 * the kernel specify what kind of dirent layout it wants to have.
845 * This allows the kernel to read directories into kernel space or
846 * to have different dirent layouts depending on the binary type.
848 typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned);
850 struct block_device_operations {
851 int (*open) (struct inode *, struct file *);
852 int (*release) (struct inode *, struct file *);
853 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
854 int (*media_changed) (struct gendisk *);
855 int (*revalidate_disk) (struct gendisk *);
856 struct module *owner;
860 * "descriptor" for what we're up to with a read for sendfile().
861 * This allows us to use the same read code yet
862 * have multiple different users of the data that
863 * we read from a file.
865 * The simplest case just copies the data to user
878 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
882 * read, write, poll, fsync, readv, writev can be called
883 * without the big kernel lock held in all filesystems.
885 struct file_operations {
886 struct module *owner;
887 loff_t (*llseek) (struct file *, loff_t, int);
888 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
889 ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
890 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
891 ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);
892 int (*readdir) (struct file *, void *, filldir_t);
893 unsigned int (*poll) (struct file *, struct poll_table_struct *);
894 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
895 int (*mmap) (struct file *, struct vm_area_struct *);
896 int (*open) (struct inode *, struct file *);
897 int (*flush) (struct file *);
898 int (*release) (struct inode *, struct file *);
899 int (*fsync) (struct file *, struct dentry *, int datasync);
900 int (*aio_fsync) (struct kiocb *, int datasync);
901 int (*fasync) (int, struct file *, int);
902 int (*lock) (struct file *, int, struct file_lock *);
903 ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
904 ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
905 ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
906 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
907 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
908 int (*check_flags)(int);
909 int (*dir_notify)(struct file *filp, unsigned long arg);
912 struct inode_operations {
913 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
914 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
915 int (*link) (struct dentry *,struct inode *,struct dentry *);
916 int (*unlink) (struct inode *,struct dentry *);
917 int (*symlink) (struct inode *,struct dentry *,const char *);
918 int (*mkdir) (struct inode *,struct dentry *,int);
919 int (*rmdir) (struct inode *,struct dentry *);
920 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
921 int (*rename) (struct inode *, struct dentry *,
922 struct inode *, struct dentry *);
923 int (*readlink) (struct dentry *, char __user *,int);
924 int (*follow_link) (struct dentry *, struct nameidata *);
925 void (*put_link) (struct dentry *, struct nameidata *);
926 void (*truncate) (struct inode *);
927 int (*permission) (struct inode *, int, struct nameidata *);
928 int (*setattr) (struct dentry *, struct iattr *);
929 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
930 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
931 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
932 ssize_t (*listxattr) (struct dentry *, char *, size_t);
933 int (*removexattr) (struct dentry *, const char *);
938 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
939 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
940 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
941 unsigned long, loff_t *);
942 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
943 unsigned long, loff_t *);
946 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
947 * without the big kernel lock held in all filesystems.
949 struct super_operations {
950 struct inode *(*alloc_inode)(struct super_block *sb);
951 void (*destroy_inode)(struct inode *);
953 void (*read_inode) (struct inode *);
955 void (*dirty_inode) (struct inode *);
956 void (*write_inode) (struct inode *, int);
957 void (*put_inode) (struct inode *);
958 void (*drop_inode) (struct inode *);
959 void (*delete_inode) (struct inode *);
960 void (*put_super) (struct super_block *);
961 void (*write_super) (struct super_block *);
962 int (*sync_fs)(struct super_block *sb, int wait);
963 void (*write_super_lockfs) (struct super_block *);
964 void (*unlockfs) (struct super_block *);
965 int (*statfs) (struct super_block *, struct kstatfs *);
966 int (*remount_fs) (struct super_block *, int *, char *);
967 void (*clear_inode) (struct inode *);
968 void (*umount_begin) (struct super_block *);
970 int (*show_options)(struct seq_file *, struct vfsmount *);
973 /* Inode state bits. Protected by inode_lock. */
974 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
975 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
976 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
982 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
984 extern void __mark_inode_dirty(struct inode *, int);
985 static inline void mark_inode_dirty(struct inode *inode)
987 __mark_inode_dirty(inode, I_DIRTY);
990 static inline void mark_inode_dirty_sync(struct inode *inode)
992 __mark_inode_dirty(inode, I_DIRTY_SYNC);
995 static inline void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
997 struct inode *inode = dentry->d_inode;
999 if (MNT_IS_NOATIME(mnt))
1001 if (S_ISDIR(inode->i_mode) && MNT_IS_NODIRATIME(mnt))
1003 if (IS_RDONLY(inode) || MNT_IS_RDONLY(mnt))
1006 update_atime(inode);
1009 static inline void file_accessed(struct file *file)
1011 if (!(file->f_flags & O_NOATIME))
1012 touch_atime(file->f_vfsmnt, file->f_dentry);
1015 int sync_inode(struct inode *inode, struct writeback_control *wbc);
1018 * &export_operations - for nfsd to communicate with file systems
1019 * decode_fh: decode a file handle fragment and return a &struct dentry
1020 * encode_fh: encode a file handle fragment from a dentry
1021 * get_name: find the name for a given inode in a given directory
1022 * get_parent: find the parent of a given directory
1023 * get_dentry: find a dentry for the inode given a file handle sub-fragment
1026 * The export_operations structure provides a means for nfsd to communicate
1027 * with a particular exported file system - particularly enabling nfsd and
1028 * the filesystem to co-operate when dealing with file handles.
1030 * export_operations contains two basic operation for dealing with file handles,
1031 * decode_fh() and encode_fh(), and allows for some other operations to be defined
1032 * which standard helper routines use to get specific information from the
1035 * nfsd encodes information use to determine which filesystem a filehandle
1036 * applies to in the initial part of the file handle. The remainder, termed a
1037 * file handle fragment, is controlled completely by the filesystem.
1038 * The standard helper routines assume that this fragment will contain one or two
1039 * sub-fragments, one which identifies the file, and one which may be used to
1040 * identify the (a) directory containing the file.
1042 * In some situations, nfsd needs to get a dentry which is connected into a
1043 * specific part of the file tree. To allow for this, it passes the function
1044 * acceptable() together with a @context which can be used to see if the dentry
1045 * is acceptable. As there can be multiple dentrys for a given file, the filesystem
1046 * should check each one for acceptability before looking for the next. As soon
1047 * as an acceptable one is found, it should be returned.
1050 * @decode_fh is given a &struct super_block (@sb), a file handle fragment (@fh, @fh_len)
1051 * and an acceptability testing function (@acceptable, @context). It should return
1052 * a &struct dentry which refers to the same file that the file handle fragment refers
1053 * to, and which passes the acceptability test. If it cannot, it should return
1054 * a %NULL pointer if the file was found but no acceptable &dentries were available, or
1055 * a %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or %ENOMEM).
1058 * @encode_fh should store in the file handle fragment @fh (using at most @max_len bytes)
1059 * information that can be used by @decode_fh to recover the file refered to by the
1060 * &struct dentry @de. If the @connectable flag is set, the encode_fh() should store
1061 * sufficient information so that a good attempt can be made to find not only
1062 * the file but also it's place in the filesystem. This typically means storing
1063 * a reference to de->d_parent in the filehandle fragment.
1064 * encode_fh() should return the number of bytes stored or a negative error code
1068 * @get_name should find a name for the given @child in the given @parent directory.
1069 * The name should be stored in the @name (with the understanding that it is already
1070 * pointing to a a %NAME_MAX+1 sized buffer. get_name() should return %0 on success,
1071 * a negative error code or error.
1072 * @get_name will be called without @parent->i_sem held.
1075 * @get_parent should find the parent directory for the given @child which is also
1076 * a directory. In the event that it cannot be found, or storage space cannot be
1077 * allocated, a %ERR_PTR should be returned.
1080 * Given a &super_block (@sb) and a pointer to a file-system specific inode identifier,
1081 * possibly an inode number, (@inump) get_dentry() should find the identified inode and
1082 * return a dentry for that inode.
1083 * Any suitable dentry can be returned including, if necessary, a new dentry created
1084 * with d_alloc_root. The caller can then find any other extant dentrys by following the
1085 * d_alias links. If a new dentry was created using d_alloc_root, DCACHE_NFSD_DISCONNECTED
1086 * should be set, and the dentry should be d_rehash()ed.
1088 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code can be returned.
1089 * The @inump will be whatever was passed to nfsd_find_fh_dentry() in either the
1090 * @obj or @parent parameters.
1093 * get_parent is called with child->d_inode->i_sem down
1094 * get_name is not (which is possibly inconsistent)
1097 struct export_operations {
1098 struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
1099 int (*acceptable)(void *context, struct dentry *de),
1101 int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
1104 /* the following are only called from the filesystem itself */
1105 int (*get_name)(struct dentry *parent, char *name,
1106 struct dentry *child);
1107 struct dentry * (*get_parent)(struct dentry *child);
1108 struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
1110 /* This is set by the exporting module to a standard helper */
1111 struct dentry * (*find_exported_dentry)(
1112 struct super_block *sb, void *obj, void *parent,
1113 int (*acceptable)(void *context, struct dentry *de),
1120 struct file_system_type {
1123 struct super_block *(*get_sb) (struct file_system_type *, int,
1124 const char *, void *);
1125 void (*kill_sb) (struct super_block *);
1126 struct module *owner;
1127 struct file_system_type * next;
1128 struct list_head fs_supers;
1131 struct super_block *get_sb_bdev(struct file_system_type *fs_type,
1132 int flags, const char *dev_name, void *data,
1133 int (*fill_super)(struct super_block *, void *, int));
1134 struct super_block *get_sb_single(struct file_system_type *fs_type,
1135 int flags, void *data,
1136 int (*fill_super)(struct super_block *, void *, int));
1137 struct super_block *get_sb_nodev(struct file_system_type *fs_type,
1138 int flags, void *data,
1139 int (*fill_super)(struct super_block *, void *, int));
1140 void generic_shutdown_super(struct super_block *sb);
1141 void kill_block_super(struct super_block *sb);
1142 void kill_anon_super(struct super_block *sb);
1143 void kill_litter_super(struct super_block *sb);
1144 void deactivate_super(struct super_block *sb);
1145 int set_anon_super(struct super_block *s, void *data);
1146 struct super_block *sget(struct file_system_type *type,
1147 int (*test)(struct super_block *,void *),
1148 int (*set)(struct super_block *,void *),
1150 struct super_block *get_sb_pseudo(struct file_system_type *, char *,
1151 struct super_operations *ops, unsigned long);
1152 int __put_super(struct super_block *sb);
1153 void unnamed_dev_init(void);
1155 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1156 #define fops_get(fops) \
1157 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1158 #define fops_put(fops) \
1159 do { if (fops) module_put((fops)->owner); } while(0)
1161 extern int register_filesystem(struct file_system_type *);
1162 extern int unregister_filesystem(struct file_system_type *);
1163 extern struct vfsmount *kern_mount(struct file_system_type *);
1164 extern int may_umount_tree(struct vfsmount *);
1165 extern int may_umount(struct vfsmount *);
1166 extern long do_mount(char *, char *, char *, unsigned long, void *);
1168 extern int vfs_statfs(struct super_block *, struct kstatfs *);
1170 /* Return value for VFS lock functions - tells locks.c to lock conventionally
1171 * REALLY kosha for root NFS and nfs_lock
1173 #define LOCK_USE_CLNT 1
1175 #define FLOCK_VERIFY_READ 1
1176 #define FLOCK_VERIFY_WRITE 2
1178 extern int locks_mandatory_locked(struct inode *);
1179 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1182 * Candidates for mandatory locking have the setgid bit set
1183 * but no group execute bit - an otherwise meaningless combination.
1185 #define MANDATORY_LOCK(inode) \
1186 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1188 static inline int locks_verify_locked(struct inode *inode)
1190 if (MANDATORY_LOCK(inode))
1191 return locks_mandatory_locked(inode);
1195 static inline int locks_verify_area(int read_write, struct inode *inode,
1196 struct file *filp, loff_t offset,
1199 if (inode->i_flock && MANDATORY_LOCK(inode))
1200 return locks_mandatory_area(read_write, inode, filp, offset, count);
1204 static inline int locks_verify_truncate(struct inode *inode,
1208 if (inode->i_flock && MANDATORY_LOCK(inode))
1209 return locks_mandatory_area(
1210 FLOCK_VERIFY_WRITE, inode, filp,
1211 size < inode->i_size ? size : inode->i_size,
1212 (size < inode->i_size ? inode->i_size - size
1213 : size - inode->i_size)
1218 static inline int break_lease(struct inode *inode, unsigned int mode)
1221 return __break_lease(inode, mode);
1227 extern int do_truncate(struct dentry *, loff_t start);
1228 extern struct file *filp_open(const char *, int, int);
1229 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1230 extern int filp_close(struct file *, fl_owner_t id);
1231 extern char * getname(const char __user *);
1234 extern void __init vfs_caches_init_early(void);
1235 extern void __init vfs_caches_init(unsigned long);
1237 #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
1238 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1239 #ifndef CONFIG_AUDITSYSCALL
1240 #define putname(name) __putname(name)
1242 #define putname(name) \
1244 if (unlikely(current->audit_context)) \
1245 audit_putname(name); \
1251 extern int register_blkdev(unsigned int, const char *);
1252 extern int unregister_blkdev(unsigned int, const char *);
1253 extern struct block_device *bdget(dev_t);
1254 extern void bd_set_size(struct block_device *, loff_t size);
1255 extern void bd_forget(struct inode *inode);
1256 extern void bdput(struct block_device *);
1257 extern int blkdev_open(struct inode *, struct file *);
1258 extern struct block_device *open_by_devnum(dev_t, unsigned);
1259 extern struct file_operations def_blk_fops;
1260 extern struct address_space_operations def_blk_aops;
1261 extern struct file_operations def_chr_fops;
1262 extern struct file_operations bad_sock_fops;
1263 extern struct file_operations def_fifo_fops;
1264 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1265 extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
1266 extern int blkdev_get(struct block_device *, mode_t, unsigned);
1267 extern int blkdev_put(struct block_device *);
1268 extern int bd_claim(struct block_device *, void *);
1269 extern void bd_release(struct block_device *);
1272 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, char *);
1273 extern int register_chrdev_region(dev_t, unsigned, char *);
1274 extern int register_chrdev(unsigned int, const char *,
1275 struct file_operations *);
1276 extern int unregister_chrdev(unsigned int, const char *);
1277 extern void unregister_chrdev_region(dev_t, unsigned);
1278 extern int chrdev_open(struct inode *, struct file *);
1280 /* fs/block_dev.c */
1281 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1282 extern const char *__bdevname(dev_t, char *buffer);
1283 extern const char *bdevname(struct block_device *bdev, char *buffer);
1284 extern struct block_device *lookup_bdev(const char *);
1285 extern struct block_device *open_bdev_excl(const char *, int, void *);
1286 extern void close_bdev_excl(struct block_device *);
1288 extern void init_special_inode(struct inode *, umode_t, dev_t);
1290 /* Invalid inode operations -- fs/bad_inode.c */
1291 extern void make_bad_inode(struct inode *);
1292 extern int is_bad_inode(struct inode *);
1294 extern struct file_operations read_fifo_fops;
1295 extern struct file_operations write_fifo_fops;
1296 extern struct file_operations rdwr_fifo_fops;
1297 extern struct file_operations read_pipe_fops;
1298 extern struct file_operations write_pipe_fops;
1299 extern struct file_operations rdwr_pipe_fops;
1301 extern int fs_may_remount_ro(struct super_block *);
1304 * return READ, READA, or WRITE
1306 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1309 * return data direction, READ or WRITE
1311 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1313 extern int check_disk_change(struct block_device *);
1314 extern int invalidate_inodes(struct super_block *);
1315 extern int __invalidate_device(struct block_device *, int);
1316 extern int invalidate_partition(struct gendisk *, int);
1317 unsigned long invalidate_mapping_pages(struct address_space *mapping,
1318 pgoff_t start, pgoff_t end);
1319 unsigned long invalidate_inode_pages(struct address_space *mapping);
1320 static inline void invalidate_remote_inode(struct inode *inode)
1322 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1323 S_ISLNK(inode->i_mode))
1324 invalidate_inode_pages(inode->i_mapping);
1326 extern void invalidate_inode_pages2(struct address_space *mapping);
1327 extern void write_inode_now(struct inode *, int);
1328 extern int filemap_fdatawrite(struct address_space *);
1329 extern int filemap_flush(struct address_space *);
1330 extern int filemap_fdatawait(struct address_space *);
1331 extern int filemap_write_and_wait(struct address_space *mapping);
1332 extern void sync_supers(void);
1333 extern void sync_filesystems(int wait);
1334 extern void emergency_sync(void);
1335 extern void emergency_remount(void);
1336 extern int do_remount_sb(struct super_block *sb, int flags,
1337 void *data, int force);
1338 extern sector_t bmap(struct inode *, sector_t);
1339 extern int setattr_mask(unsigned int);
1340 extern int notify_change(struct dentry *, struct iattr *);
1341 extern int permission(struct inode *, int, struct nameidata *);
1342 extern int vfs_permission(struct inode *, int);
1343 extern int get_write_access(struct inode *);
1344 extern int deny_write_access(struct file *);
1345 static inline void put_write_access(struct inode * inode)
1347 atomic_dec(&inode->i_writecount);
1349 static inline void allow_write_access(struct file *file)
1352 atomic_inc(&file->f_dentry->d_inode->i_writecount);
1354 extern int do_pipe(int *);
1356 extern int open_namei(const char *, int, int, struct nameidata *);
1357 extern int may_open(struct nameidata *, int, int);
1359 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1360 extern struct file * open_exec(const char *);
1362 /* fs/dcache.c -- generic fs support functions */
1363 extern int is_subdir(struct dentry *, struct dentry *);
1364 extern ino_t find_inode_number(struct dentry *, struct qstr *);
1366 #include <linux/err.h>
1368 /* needed for stackable file system support */
1369 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1371 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1373 extern void inode_init_once(struct inode *);
1374 extern void iput(struct inode *);
1375 extern struct inode * igrab(struct inode *);
1376 extern ino_t iunique(struct super_block *, ino_t);
1377 extern int inode_needs_sync(struct inode *inode);
1378 extern void generic_delete_inode(struct inode *inode);
1380 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1381 int (*test)(struct inode *, void *), void *data);
1382 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1384 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1385 extern struct inode * iget_locked(struct super_block *, unsigned long);
1386 extern void unlock_new_inode(struct inode *);
1388 static inline struct inode *iget(struct super_block *sb, unsigned long ino)
1390 struct inode *inode = iget_locked(sb, ino);
1392 if (inode && (inode->i_state & I_NEW)) {
1393 sb->s_op->read_inode(inode);
1394 unlock_new_inode(inode);
1400 extern void __iget(struct inode * inode);
1401 extern void clear_inode(struct inode *);
1402 extern void destroy_inode(struct inode *);
1403 extern struct inode *new_inode(struct super_block *);
1404 extern int remove_suid(struct dentry *);
1405 extern void remove_dquot_ref(struct super_block *, int, struct list_head *);
1406 extern struct semaphore iprune_sem;
1408 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1409 extern void remove_inode_hash(struct inode *);
1410 static inline void insert_inode_hash(struct inode *inode) {
1411 __insert_inode_hash(inode, inode->i_ino);
1414 extern struct file * get_empty_filp(void);
1415 extern void file_move(struct file *f, struct list_head *list);
1416 extern void file_kill(struct file *f);
1418 extern void submit_bio(int, struct bio *);
1419 extern int bdev_read_only(struct block_device *);
1420 extern int set_blocksize(struct block_device *, int);
1421 extern int sb_set_blocksize(struct super_block *, int);
1422 extern int sb_min_blocksize(struct super_block *, int);
1424 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1425 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1426 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1427 extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1428 extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *);
1429 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
1430 extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *);
1431 extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t);
1432 extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *);
1433 extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t);
1434 extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1435 unsigned long, loff_t *);
1436 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1437 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1438 ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
1439 unsigned long nr_segs, loff_t *ppos);
1440 extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
1441 extern void do_generic_mapping_read(struct address_space *mapping,
1442 struct file_ra_state *, struct file *,
1443 loff_t *, read_descriptor_t *, read_actor_t, int);
1445 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1446 extern ssize_t generic_file_direct_IO(int rw, struct kiocb *iocb,
1447 const struct iovec *iov, loff_t offset, unsigned long nr_segs);
1448 extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov,
1449 unsigned long nr_segs, loff_t *ppos);
1450 ssize_t generic_file_writev(struct file *filp, const struct iovec *iov,
1451 unsigned long nr_segs, loff_t *ppos);
1452 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1453 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1454 extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1455 extern int generic_file_open(struct inode * inode, struct file * filp);
1456 extern int nonseekable_open(struct inode * inode, struct file * filp);
1458 static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
1459 read_descriptor_t * desc,
1460 read_actor_t actor, int nonblock)
1462 do_generic_mapping_read(filp->f_mapping,
1471 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1472 struct block_device *bdev, const struct iovec *iov, loff_t offset,
1473 unsigned long nr_segs, get_blocks_t get_blocks, dio_iodone_t end_io,
1474 int needs_special_locking);
1477 * For filesystems which need locking between buffered and direct access
1479 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1480 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1481 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1482 dio_iodone_t end_io)
1484 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1485 nr_segs, get_blocks, end_io, 1);
1488 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1489 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1490 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1491 dio_iodone_t end_io)
1493 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1494 nr_segs, get_blocks, end_io, 0);
1497 extern struct file_operations generic_ro_fops;
1499 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1501 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1502 extern int vfs_follow_link(struct nameidata *, const char *);
1503 extern int page_readlink(struct dentry *, char __user *, int);
1504 extern int page_follow_link(struct dentry *, struct nameidata *);
1505 extern int page_follow_link_light(struct dentry *, struct nameidata *);
1506 extern void page_put_link(struct dentry *, struct nameidata *);
1507 extern int page_symlink(struct inode *inode, const char *symname, int len);
1508 extern struct inode_operations page_symlink_inode_operations;
1509 extern int generic_readlink(struct dentry *, char __user *, int);
1510 extern void generic_fillattr(struct inode *, struct kstat *);
1511 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1512 void inode_add_bytes(struct inode *inode, loff_t bytes);
1513 void inode_sub_bytes(struct inode *inode, loff_t bytes);
1514 loff_t inode_get_bytes(struct inode *inode);
1515 void inode_set_bytes(struct inode *inode, loff_t bytes);
1517 extern int vfs_readdir(struct file *, filldir_t, void *);
1519 extern int vfs_stat(char __user *, struct kstat *);
1520 extern int vfs_lstat(char __user *, struct kstat *);
1521 extern int vfs_fstat(unsigned int, struct kstat *);
1523 extern struct file_system_type *get_fs_type(const char *name);
1524 extern struct super_block *get_super(struct block_device *);
1525 extern struct super_block *user_get_super(dev_t);
1526 extern void drop_super(struct super_block *sb);
1528 extern int dcache_dir_open(struct inode *, struct file *);
1529 extern int dcache_dir_close(struct inode *, struct file *);
1530 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1531 extern int dcache_readdir(struct file *, void *, filldir_t);
1532 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1533 extern int simple_statfs(struct super_block *, struct kstatfs *);
1534 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1535 extern int simple_unlink(struct inode *, struct dentry *);
1536 extern int simple_rmdir(struct inode *, struct dentry *);
1537 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1538 extern int simple_sync_file(struct file *, struct dentry *, int);
1539 extern int simple_empty(struct dentry *);
1540 extern int simple_readpage(struct file *file, struct page *page);
1541 extern int simple_prepare_write(struct file *file, struct page *page,
1542 unsigned offset, unsigned to);
1543 extern int simple_commit_write(struct file *file, struct page *page,
1544 unsigned offset, unsigned to);
1546 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1547 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
1548 extern struct file_operations simple_dir_operations;
1549 extern struct inode_operations simple_dir_inode_operations;
1550 struct tree_descr { char *name; struct file_operations *ops; int mode; };
1551 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
1552 extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count);
1553 extern void simple_release_fs(struct vfsmount **mount, int *count);
1555 extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
1557 extern int inode_change_ok(struct inode *, struct iattr *);
1558 extern int __must_check inode_setattr(struct inode *, struct iattr *);
1560 extern void inode_update_time(struct inode *inode, struct vfsmount *mnt, int ctime_too);
1562 static inline ino_t parent_ino(struct dentry *dentry)
1566 spin_lock(&dentry->d_lock);
1567 res = dentry->d_parent->d_inode->i_ino;
1568 spin_unlock(&dentry->d_lock);
1573 extern int unshare_files(void);
1575 #ifdef CONFIG_SECURITY
1576 static inline char *alloc_secdata(void)
1578 return (char *)get_zeroed_page(GFP_KERNEL);
1581 static inline void free_secdata(void *secdata)
1583 free_page((unsigned long)secdata);
1586 static inline char *alloc_secdata(void)
1591 static inline void free_secdata(void *secdata)
1593 #endif /* CONFIG_SECURITY */
1595 #endif /* __KERNEL__ */
1596 #endif /* _LINUX_FS_H */