5 * This file has definitions for some important file table
9 #include <linux/config.h>
10 #include <linux/limits.h>
11 #include <linux/ioctl.h>
12 #include <linux/rcuref.h>
15 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
16 * the file limit at runtime and only root can increase the per-process
17 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
18 * upper limit on files-per-process.
20 * Some programs (notably those using select()) may have to be
21 * recompiled to take full advantage of the new limits..
24 /* Fixed constants first: */
26 #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
27 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
29 #define BLOCK_SIZE_BITS 10
30 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
32 /* And dynamically-tunable limits and defaults: */
33 struct files_stat_struct {
34 int nr_files; /* read only */
35 int nr_free_files; /* read only */
36 int max_files; /* tunable */
38 extern struct files_stat_struct files_stat;
40 struct inodes_stat_t {
45 extern struct inodes_stat_t inodes_stat;
47 extern int leases_enable, lease_break_time;
50 extern int dir_notify_enable;
53 #define NR_FILE 8192 /* this can well be larger on a larger system */
63 /* Internal kernel extensions */
66 #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
72 #define READA 2 /* read-ahead - don't block if no resources */
73 #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
74 #define SPECIAL 4 /* For non-blockdevice requests in request queue */
75 #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
76 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
77 #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
83 /* public flags for file_system_type */
84 #define FS_REQUIRES_DEV 1
85 #define FS_BINARY_MOUNTDATA 2
86 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
87 #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
88 * as nfs_rename() will be cleaned up
91 * These are the fs-independent mount-flags: up to 32 flags are supported
93 #define MS_RDONLY 1 /* Mount read-only */
94 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
95 #define MS_NODEV 4 /* Disallow access to device special files */
96 #define MS_NOEXEC 8 /* Disallow program execution */
97 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
98 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
99 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
100 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
101 #define MS_NOATIME 1024 /* Do not update access times. */
102 #define MS_NODIRATIME 2048 /* Do not update directory access times */
106 #define MS_VERBOSE 32768
107 #define MS_PRIVATE (1<<18) /* change to private */
108 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
109 #define MS_ACTIVE (1<<30)
110 #define MS_NOUSER (1<<31)
113 * Superblock flags that can be altered by MS_REMOUNT
115 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\
119 * Old magic mount flag and mask
121 #define MS_MGC_VAL 0xC0ED0000
122 #define MS_MGC_MSK 0xffff0000
124 /* Inode flags - they have nothing to superblock flags now */
126 #define S_SYNC 1 /* Writes are synced at once */
127 #define S_NOATIME 2 /* Do not update access times */
128 #define S_APPEND 4 /* Append-only file */
129 #define S_IMMUTABLE 8 /* Immutable file */
130 #define S_DEAD 16 /* removed, but still open directory */
131 #define S_NOQUOTA 32 /* Inode is not counted to quota */
132 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
133 #define S_NOCMTIME 128 /* Do not update file c/mtime */
134 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
135 #define S_PRIVATE 512 /* Inode is fs-internal */
138 * Note that nosuid etc flags are inode-specific: setting some file-system
139 * flags just means all the inodes inherit those flags by default. It might be
140 * possible to override it selectively if you really wanted to with some
141 * ioctl() that is not currently implemented.
143 * Exception: MS_RDONLY is always applied to the entire file system.
145 * Unfortunately, it is possible to change a filesystems flags with it mounted
146 * with files in use. This means that all of the inodes will not have their
147 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
148 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
150 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
152 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
153 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
154 ((inode)->i_flags & S_SYNC))
155 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
156 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
157 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
159 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
160 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
161 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
162 #define IS_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
163 #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
164 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
166 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
167 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
168 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
169 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
171 /* the read-only stuff doesn't really belong here, but any other place is
172 probably as bad and I don't want to create yet another include file. */
174 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
175 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
176 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
177 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
178 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
179 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
180 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
181 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
182 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
183 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
184 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
185 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
187 #define BLKPG _IO(0x12,105)/* See blkpg.h */
189 /* Some people are morons. Do not use sizeof! */
191 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
192 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
193 /* This was here just to show that the number is taken -
194 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
196 /* A jump here: 108-111 have been used for various private purposes. */
197 #define BLKBSZGET _IOR(0x12,112,size_t)
198 #define BLKBSZSET _IOW(0x12,113,size_t)
199 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
201 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
202 #define FIBMAP _IO(0x00,1) /* bmap access */
203 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
207 #include <linux/linkage.h>
208 #include <linux/wait.h>
209 #include <linux/types.h>
210 #include <linux/kdev_t.h>
211 #include <linux/dcache.h>
212 #include <linux/stat.h>
213 #include <linux/cache.h>
214 #include <linux/kobject.h>
215 #include <linux/list.h>
216 #include <linux/radix-tree.h>
217 #include <linux/prio_tree.h>
218 #include <linux/init.h>
219 #include <linux/sched.h>
221 #include <asm/atomic.h>
222 #include <asm/semaphore.h>
223 #include <asm/byteorder.h>
228 struct pipe_inode_info;
229 struct poll_table_struct;
231 struct vm_area_struct;
234 /* Used to be a macro which just called the function, now just a function */
235 extern void update_atime (struct inode *);
237 extern void __init inode_init(unsigned long);
238 extern void __init inode_init_early(void);
239 extern void __init mnt_init(unsigned long);
240 extern void __init files_init(unsigned long);
243 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
244 struct buffer_head *bh_result, int create);
245 typedef int (get_blocks_t)(struct inode *inode, sector_t iblock,
246 unsigned long max_blocks,
247 struct buffer_head *bh_result, int create);
248 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
249 ssize_t bytes, void *private);
252 * Attribute flags. These should be or-ed together to figure out what
259 #define ATTR_ATIME 16
260 #define ATTR_MTIME 32
261 #define ATTR_CTIME 64
262 #define ATTR_ATIME_SET 128
263 #define ATTR_MTIME_SET 256
264 #define ATTR_FORCE 512 /* Not a change, but a change it */
265 #define ATTR_ATTR_FLAG 1024
266 #define ATTR_KILL_SUID 2048
267 #define ATTR_KILL_SGID 4096
268 #define ATTR_FILE 8192
271 * This is the Inode Attributes structure, used for notify_change(). It
272 * uses the above definitions as flags, to know which values have changed.
273 * Also, in this manner, a Filesystem can look at only the values it cares
274 * about. Basically, these are the attributes that the VFS layer can
275 * request to change from the FS layer.
277 * Derek Atkins <warlord@MIT.EDU> 94-10-20
280 unsigned int ia_valid;
285 struct timespec ia_atime;
286 struct timespec ia_mtime;
287 struct timespec ia_ctime;
290 * Not an attribute, but an auxilary info for filesystems wanting to
291 * implement an ftruncate() like method. NOTE: filesystem should
292 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
294 struct file *ia_file;
298 * Includes for diskquotas.
300 #include <linux/quota.h>
303 * oh the beauties of C type declarations.
306 struct address_space;
307 struct writeback_control;
309 struct address_space_operations {
310 int (*writepage)(struct page *page, struct writeback_control *wbc);
311 int (*readpage)(struct file *, struct page *);
312 int (*sync_page)(struct page *);
314 /* Write back some dirty pages from this mapping. */
315 int (*writepages)(struct address_space *, struct writeback_control *);
317 /* Set a page dirty */
318 int (*set_page_dirty)(struct page *page);
320 int (*readpages)(struct file *filp, struct address_space *mapping,
321 struct list_head *pages, unsigned nr_pages);
324 * ext3 requires that a successful prepare_write() call be followed
325 * by a commit_write() call - they must be balanced
327 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
328 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
329 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
330 sector_t (*bmap)(struct address_space *, sector_t);
331 int (*invalidatepage) (struct page *, unsigned long);
332 int (*releasepage) (struct page *, gfp_t);
333 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
334 loff_t offset, unsigned long nr_segs);
335 struct page* (*get_xip_page)(struct address_space *, sector_t,
339 struct backing_dev_info;
340 struct address_space {
341 struct inode *host; /* owner: inode, block_device */
342 struct radix_tree_root page_tree; /* radix tree of all pages */
343 rwlock_t tree_lock; /* and rwlock protecting it */
344 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
345 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
346 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
347 spinlock_t i_mmap_lock; /* protect tree, count, list */
348 unsigned int truncate_count; /* Cover race condition with truncate */
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 unsigned long flags; /* error bits/gfp mask */
353 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
354 spinlock_t private_lock; /* for use by the address_space */
355 struct list_head private_list; /* ditto */
356 struct address_space *assoc_mapping; /* ditto */
357 } __attribute__((aligned(sizeof(long))));
359 * On most architectures that alignment is already the case; but
360 * must be enforced here for CRIS, to let the least signficant bit
361 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
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_sb_list;
435 struct list_head i_dentry;
439 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;
473 #ifdef CONFIG_DNOTIFY
474 unsigned long i_dnotify_mask; /* Directory notify events */
475 struct dnotify_struct *i_dnotify; /* for directory notifications */
478 #ifdef CONFIG_INOTIFY
479 struct list_head inotify_watches; /* watches on this inode */
480 struct semaphore inotify_sem; /* protects the watches list */
483 unsigned long i_state;
484 unsigned long dirtied_when; /* jiffies of first dirtying */
486 unsigned int i_flags;
488 atomic_t i_writecount;
493 #ifdef __NEED_I_SIZE_ORDERED
494 seqcount_t i_size_seqcount;
499 * NOTE: in a 32bit arch with a preemptable kernel and
500 * an UP compile the i_size_read/write must be atomic
501 * with respect to the local cpu (unlike with preempt disabled),
502 * but they don't need to be atomic with respect to other cpus like in
503 * true SMP (so they need either to either locally disable irq around
504 * the read or for example on x86 they can be still implemented as a
505 * cmpxchg8b without the need of the lock prefix). For SMP compiles
506 * and 64bit archs it makes no difference if preempt is enabled or not.
508 static inline loff_t i_size_read(struct inode *inode)
510 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
515 seq = read_seqcount_begin(&inode->i_size_seqcount);
516 i_size = inode->i_size;
517 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
519 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
523 i_size = inode->i_size;
527 return inode->i_size;
532 static inline void i_size_write(struct inode *inode, loff_t i_size)
534 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
535 write_seqcount_begin(&inode->i_size_seqcount);
536 inode->i_size = i_size;
537 write_seqcount_end(&inode->i_size_seqcount);
538 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
540 inode->i_size = i_size;
543 inode->i_size = i_size;
547 static inline unsigned iminor(struct inode *inode)
549 return MINOR(inode->i_rdev);
552 static inline unsigned imajor(struct inode *inode)
554 return MAJOR(inode->i_rdev);
557 extern struct block_device *I_BDEV(struct inode *inode);
560 rwlock_t lock; /* protects pid, uid, euid fields */
561 int pid; /* pid or -pgrp where SIGIO should be sent */
562 uid_t uid, euid; /* uid/euid of process setting the owner */
564 int signum; /* posix.1b rt signal to be delivered on IO */
568 * Track a single file's readahead state
570 struct file_ra_state {
571 unsigned long start; /* Current window */
573 unsigned long flags; /* ra flags RA_FLAG_xxx*/
574 unsigned long cache_hit; /* cache hit count*/
575 unsigned long prev_page; /* Cache last read() position */
576 unsigned long ahead_start; /* Ahead window */
577 unsigned long ahead_size;
578 unsigned long ra_pages; /* Maximum readahead window */
579 unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
580 unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
582 #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
583 #define RA_FLAG_INCACHE 0x02 /* file is already in cache */
587 * fu_list becomes invalid after file_free is called and queued via
588 * fu_rcuhead for RCU freeing
591 struct list_head fu_list;
592 struct rcu_head fu_rcuhead;
594 struct dentry *f_dentry;
595 struct vfsmount *f_vfsmnt;
596 struct file_operations *f_op;
598 unsigned int f_flags;
601 struct fown_struct f_owner;
602 unsigned int f_uid, f_gid;
603 struct file_ra_state f_ra;
605 unsigned long f_version;
608 /* needed for tty driver, and maybe others */
612 /* Used by fs/eventpoll.c to link all the hooks to this file */
613 struct list_head f_ep_links;
614 spinlock_t f_ep_lock;
615 #endif /* #ifdef CONFIG_EPOLL */
616 struct address_space *f_mapping;
618 extern spinlock_t files_lock;
619 #define file_list_lock() spin_lock(&files_lock);
620 #define file_list_unlock() spin_unlock(&files_lock);
622 #define get_file(x) rcuref_inc(&(x)->f_count)
623 #define file_count(x) atomic_read(&(x)->f_count)
625 #define MAX_NON_LFS ((1UL<<31) - 1)
627 /* Page cache limit. The filesystems should put that into their s_maxbytes
628 limits, otherwise bad things can happen in VM. */
629 #if BITS_PER_LONG==32
630 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
631 #elif BITS_PER_LONG==64
632 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
637 #define FL_ACCESS 8 /* not trying to lock, just looking */
638 #define FL_LOCKD 16 /* lock held by rpc.lockd */
639 #define FL_LEASE 32 /* lease held on this file */
640 #define FL_SLEEP 128 /* A blocking lock */
643 * The POSIX file lock owner is determined by
644 * the "struct files_struct" in the thread group
645 * (or NULL for no owner - BSD locks).
647 * Lockd stuffs a "host" pointer into this.
649 typedef struct files_struct *fl_owner_t;
651 struct file_lock_operations {
652 void (*fl_insert)(struct file_lock *); /* lock insertion callback */
653 void (*fl_remove)(struct file_lock *); /* lock removal callback */
654 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
655 void (*fl_release_private)(struct file_lock *);
658 struct lock_manager_operations {
659 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
660 void (*fl_notify)(struct file_lock *); /* unblock callback */
661 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
662 void (*fl_release_private)(struct file_lock *);
663 void (*fl_break)(struct file_lock *);
664 int (*fl_mylease)(struct file_lock *, struct file_lock *);
665 int (*fl_change)(struct file_lock **, int);
668 /* that will die - we need it for nfs_lock_info */
669 #include <linux/nfs_fs_i.h>
672 struct file_lock *fl_next; /* singly linked list for this inode */
673 struct list_head fl_link; /* doubly linked list of all locks */
674 struct list_head fl_block; /* circular list of blocked processes */
677 wait_queue_head_t fl_wait;
678 struct file *fl_file;
679 unsigned char fl_flags;
680 unsigned char fl_type;
684 struct fasync_struct * fl_fasync; /* for lease break notifications */
685 unsigned long fl_break_time; /* for nonblocking lease breaks */
687 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
688 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
690 struct nfs_lock_info nfs_fl;
691 struct nfs4_lock_info nfs4_fl;
695 /* The following constant reflects the upper bound of the file/locking space */
697 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
698 #define OFFSET_MAX INT_LIMIT(loff_t)
699 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
702 extern struct list_head file_lock_list;
704 #include <linux/fcntl.h>
706 extern int fcntl_getlk(struct file *, struct flock __user *);
707 extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
708 struct flock __user *);
710 #if BITS_PER_LONG == 32
711 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
712 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
713 struct flock64 __user *);
716 extern void send_sigio(struct fown_struct *fown, int fd, int band);
717 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
718 extern int fcntl_getlease(struct file *filp);
721 extern void locks_init_lock(struct file_lock *);
722 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
723 extern void locks_remove_posix(struct file *, fl_owner_t);
724 extern void locks_remove_flock(struct file *);
725 extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
726 extern int posix_lock_file(struct file *, struct file_lock *);
727 extern int posix_lock_file_wait(struct file *, struct file_lock *);
728 extern void posix_block_lock(struct file_lock *, struct file_lock *);
729 extern void posix_unblock_lock(struct file *, struct file_lock *);
730 extern int posix_locks_deadlock(struct file_lock *, struct file_lock *);
731 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
732 extern int __break_lease(struct inode *inode, unsigned int flags);
733 extern void lease_get_mtime(struct inode *, struct timespec *time);
734 extern int setlease(struct file *, long, struct file_lock **);
735 extern int lease_modify(struct file_lock **, int);
736 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
737 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
738 extern void steal_locks(fl_owner_t from);
740 struct fasync_struct {
743 struct fasync_struct *fa_next; /* singly linked list */
744 struct file *fa_file;
747 #define FASYNC_MAGIC 0x4601
749 /* SMP safe fasync helpers: */
750 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
751 /* can be called from interrupts */
752 extern void kill_fasync(struct fasync_struct **, int, int);
753 /* only for net: no internal synchronization */
754 extern void __kill_fasync(struct fasync_struct *, int, int);
756 extern int f_setown(struct file *filp, unsigned long arg, int force);
757 extern void f_delown(struct file *filp);
758 extern int send_sigurg(struct fown_struct *fown);
764 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
765 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
766 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
768 extern struct list_head super_blocks;
769 extern spinlock_t sb_lock;
771 #define sb_entry(list) list_entry((list), struct super_block, s_list)
772 #define S_BIAS (1<<30)
774 struct list_head s_list; /* Keep this first */
775 dev_t s_dev; /* search index; _not_ kdev_t */
776 unsigned long s_blocksize;
777 unsigned long s_old_blocksize;
778 unsigned char s_blocksize_bits;
779 unsigned char s_dirt;
780 unsigned long long s_maxbytes; /* Max file size */
781 struct file_system_type *s_type;
782 struct super_operations *s_op;
783 struct dquot_operations *dq_op;
784 struct quotactl_ops *s_qcop;
785 struct export_operations *s_export_op;
786 unsigned long s_flags;
787 unsigned long s_magic;
788 struct dentry *s_root;
789 struct rw_semaphore s_umount;
790 struct semaphore s_lock;
796 struct xattr_handler **s_xattr;
798 struct list_head s_inodes; /* all inodes */
799 struct list_head s_dirty; /* dirty inodes */
800 struct list_head s_io; /* parked for writeback */
801 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
802 struct list_head s_files;
804 struct block_device *s_bdev;
805 struct list_head s_instances;
806 struct quota_info s_dquot; /* Diskquota specific options */
809 wait_queue_head_t s_wait_unfrozen;
811 char s_id[32]; /* Informational name */
813 void *s_fs_info; /* Filesystem private info */
816 * The next field is for VFS *only*. No filesystems have any business
817 * even looking at it. You had been warned.
819 struct semaphore s_vfs_rename_sem; /* Kludge */
821 /* Granuality of c/m/atime in ns.
822 Cannot be worse than a second */
826 extern struct timespec current_fs_time(struct super_block *sb);
829 * Snapshotting support.
837 #define vfs_check_frozen(sb, level) \
838 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
840 static inline void get_fs_excl(void)
842 atomic_inc(¤t->fs_excl);
845 static inline void put_fs_excl(void)
847 atomic_dec(¤t->fs_excl);
850 static inline int has_fs_excl(void)
852 return atomic_read(¤t->fs_excl);
857 * Superblock locking.
859 static inline void lock_super(struct super_block * sb)
865 static inline void unlock_super(struct super_block * sb)
872 * VFS helper functions..
874 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
875 extern int vfs_mkdir(struct inode *, struct dentry *, int);
876 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
877 extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
878 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
879 extern int vfs_rmdir(struct inode *, struct dentry *);
880 extern int vfs_unlink(struct inode *, struct dentry *);
881 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
884 * VFS dentry helper functions.
886 extern void dentry_unhash(struct dentry *dentry);
891 * NOTE! These match bits 12..15 of stat.st_mode
892 * (ie "(i_mode >> 12) & 15").
904 #define OSYNC_METADATA (1<<0)
905 #define OSYNC_DATA (1<<1)
906 #define OSYNC_INODE (1<<2)
907 int generic_osync_inode(struct inode *, struct address_space *, int);
910 * This is the "filldir" function type, used by readdir() to let
911 * the kernel specify what kind of dirent layout it wants to have.
912 * This allows the kernel to read directories into kernel space or
913 * to have different dirent layouts depending on the binary type.
915 typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned);
917 struct block_device_operations {
918 int (*open) (struct inode *, struct file *);
919 int (*release) (struct inode *, struct file *);
920 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
921 long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
922 long (*compat_ioctl) (struct file *, unsigned, unsigned long);
923 int (*direct_access) (struct block_device *, sector_t, unsigned long *);
924 int (*media_changed) (struct gendisk *);
925 int (*revalidate_disk) (struct gendisk *);
926 struct module *owner;
930 * "descriptor" for what we're up to with a read for sendfile().
931 * This allows us to use the same read code yet
932 * have multiple different users of the data that
933 * we read from a file.
935 * The simplest case just copies the data to user
948 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
950 /* These macros are for out of kernel modules to test that
951 * the kernel supports the unlocked_ioctl and compat_ioctl
952 * fields in struct file_operations. */
953 #define HAVE_COMPAT_IOCTL 1
954 #define HAVE_UNLOCKED_IOCTL 1
958 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
959 * can be called without the big kernel lock held in all filesystems.
961 struct file_operations {
962 struct module *owner;
963 loff_t (*llseek) (struct file *, loff_t, int);
964 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
965 ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
966 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
967 ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);
968 int (*readdir) (struct file *, void *, filldir_t);
969 unsigned int (*poll) (struct file *, struct poll_table_struct *);
970 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
971 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
972 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
973 int (*mmap) (struct file *, struct vm_area_struct *);
974 int (*open) (struct inode *, struct file *);
975 int (*flush) (struct file *);
976 int (*release) (struct inode *, struct file *);
977 int (*fsync) (struct file *, struct dentry *, int datasync);
978 int (*aio_fsync) (struct kiocb *, int datasync);
979 int (*fasync) (int, struct file *, int);
980 int (*lock) (struct file *, int, struct file_lock *);
981 ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
982 ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
983 ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
984 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
985 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
986 int (*check_flags)(int);
987 int (*dir_notify)(struct file *filp, unsigned long arg);
988 int (*flock) (struct file *, int, struct file_lock *);
991 struct inode_operations {
992 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
993 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
994 int (*link) (struct dentry *,struct inode *,struct dentry *);
995 int (*unlink) (struct inode *,struct dentry *);
996 int (*symlink) (struct inode *,struct dentry *,const char *);
997 int (*mkdir) (struct inode *,struct dentry *,int);
998 int (*rmdir) (struct inode *,struct dentry *);
999 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1000 int (*rename) (struct inode *, struct dentry *,
1001 struct inode *, struct dentry *);
1002 int (*readlink) (struct dentry *, char __user *,int);
1003 void * (*follow_link) (struct dentry *, struct nameidata *);
1004 void (*put_link) (struct dentry *, struct nameidata *, void *);
1005 void (*truncate) (struct inode *);
1006 int (*permission) (struct inode *, int, struct nameidata *);
1007 int (*setattr) (struct dentry *, struct iattr *);
1008 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1009 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1010 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1011 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1012 int (*removexattr) (struct dentry *, const char *);
1017 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1018 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1019 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1020 unsigned long, loff_t *);
1021 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1022 unsigned long, loff_t *);
1025 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
1026 * without the big kernel lock held in all filesystems.
1028 struct super_operations {
1029 struct inode *(*alloc_inode)(struct super_block *sb);
1030 void (*destroy_inode)(struct inode *);
1032 void (*read_inode) (struct inode *);
1034 void (*dirty_inode) (struct inode *);
1035 int (*write_inode) (struct inode *, int);
1036 void (*put_inode) (struct inode *);
1037 void (*drop_inode) (struct inode *);
1038 void (*delete_inode) (struct inode *);
1039 void (*put_super) (struct super_block *);
1040 void (*write_super) (struct super_block *);
1041 int (*sync_fs)(struct super_block *sb, int wait);
1042 void (*write_super_lockfs) (struct super_block *);
1043 void (*unlockfs) (struct super_block *);
1044 int (*statfs) (struct super_block *, struct kstatfs *);
1045 int (*remount_fs) (struct super_block *, int *, char *);
1046 void (*clear_inode) (struct inode *);
1047 void (*umount_begin) (struct super_block *);
1049 int (*show_options)(struct seq_file *, struct vfsmount *);
1051 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1052 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1055 /* Inode state bits. Protected by inode_lock. */
1056 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
1057 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
1058 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
1060 #define I_LOCK (1 << __I_LOCK)
1061 #define I_FREEING 16
1064 #define I_WILL_FREE 128
1066 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1068 extern void __mark_inode_dirty(struct inode *, int);
1069 static inline void mark_inode_dirty(struct inode *inode)
1071 __mark_inode_dirty(inode, I_DIRTY);
1074 static inline void mark_inode_dirty_sync(struct inode *inode)
1076 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1079 static inline void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
1081 /* per-mountpoint checks will go here */
1082 update_atime(dentry->d_inode);
1085 static inline void file_accessed(struct file *file)
1087 if (!(file->f_flags & O_NOATIME))
1088 touch_atime(file->f_vfsmnt, file->f_dentry);
1091 int sync_inode(struct inode *inode, struct writeback_control *wbc);
1094 * struct export_operations - for nfsd to communicate with file systems
1095 * @decode_fh: decode a file handle fragment and return a &struct dentry
1096 * @encode_fh: encode a file handle fragment from a dentry
1097 * @get_name: find the name for a given inode in a given directory
1098 * @get_parent: find the parent of a given directory
1099 * @get_dentry: find a dentry for the inode given a file handle sub-fragment
1100 * @find_exported_dentry:
1101 * set by the exporting module to a standard helper function.
1104 * The export_operations structure provides a means for nfsd to communicate
1105 * with a particular exported file system - particularly enabling nfsd and
1106 * the filesystem to co-operate when dealing with file handles.
1108 * export_operations contains two basic operation for dealing with file
1109 * handles, decode_fh() and encode_fh(), and allows for some other
1110 * operations to be defined which standard helper routines use to get
1111 * specific information from the filesystem.
1113 * nfsd encodes information use to determine which filesystem a filehandle
1114 * applies to in the initial part of the file handle. The remainder, termed
1115 * a file handle fragment, is controlled completely by the filesystem. The
1116 * standard helper routines assume that this fragment will contain one or
1117 * two sub-fragments, one which identifies the file, and one which may be
1118 * used to identify the (a) directory containing the file.
1120 * In some situations, nfsd needs to get a dentry which is connected into a
1121 * specific part of the file tree. To allow for this, it passes the
1122 * function acceptable() together with a @context which can be used to see
1123 * if the dentry is acceptable. As there can be multiple dentrys for a
1124 * given file, the filesystem should check each one for acceptability before
1125 * looking for the next. As soon as an acceptable one is found, it should
1129 * @decode_fh is given a &struct super_block (@sb), a file handle fragment
1130 * (@fh, @fh_len) and an acceptability testing function (@acceptable,
1131 * @context). It should return a &struct dentry which refers to the same
1132 * file that the file handle fragment refers to, and which passes the
1133 * acceptability test. If it cannot, it should return a %NULL pointer if
1134 * the file was found but no acceptable &dentries were available, or a
1135 * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
1139 * @encode_fh should store in the file handle fragment @fh (using at most
1140 * @max_len bytes) information that can be used by @decode_fh to recover the
1141 * file refered to by the &struct dentry @de. If the @connectable flag is
1142 * set, the encode_fh() should store sufficient information so that a good
1143 * attempt can be made to find not only the file but also it's place in the
1144 * filesystem. This typically means storing a reference to de->d_parent in
1145 * the filehandle fragment. encode_fh() should return the number of bytes
1146 * stored or a negative error code such as %-ENOSPC
1149 * @get_name should find a name for the given @child in the given @parent
1150 * directory. The name should be stored in the @name (with the
1151 * understanding that it is already pointing to a a %NAME_MAX+1 sized
1152 * buffer. get_name() should return %0 on success, a negative error code
1153 * or error. @get_name will be called without @parent->i_sem held.
1156 * @get_parent should find the parent directory for the given @child which
1157 * is also a directory. In the event that it cannot be found, or storage
1158 * space cannot be allocated, a %ERR_PTR should be returned.
1161 * Given a &super_block (@sb) and a pointer to a file-system specific inode
1162 * identifier, possibly an inode number, (@inump) get_dentry() should find
1163 * the identified inode and return a dentry for that inode. Any suitable
1164 * dentry can be returned including, if necessary, a new dentry created with
1165 * d_alloc_root. The caller can then find any other extant dentrys by
1166 * following the d_alias links. If a new dentry was created using
1167 * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
1168 * should be d_rehash()ed.
1170 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
1171 * can be returned. The @inump will be whatever was passed to
1172 * nfsd_find_fh_dentry() in either the @obj or @parent parameters.
1175 * get_parent is called with child->d_inode->i_sem down
1176 * get_name is not (which is possibly inconsistent)
1179 struct export_operations {
1180 struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
1181 int (*acceptable)(void *context, struct dentry *de),
1183 int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
1186 /* the following are only called from the filesystem itself */
1187 int (*get_name)(struct dentry *parent, char *name,
1188 struct dentry *child);
1189 struct dentry * (*get_parent)(struct dentry *child);
1190 struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
1192 /* This is set by the exporting module to a standard helper */
1193 struct dentry * (*find_exported_dentry)(
1194 struct super_block *sb, void *obj, void *parent,
1195 int (*acceptable)(void *context, struct dentry *de),
1201 extern struct dentry *
1202 find_exported_dentry(struct super_block *sb, void *obj, void *parent,
1203 int (*acceptable)(void *context, struct dentry *de),
1206 struct file_system_type {
1209 struct super_block *(*get_sb) (struct file_system_type *, int,
1210 const char *, void *);
1211 void (*kill_sb) (struct super_block *);
1212 struct module *owner;
1213 struct file_system_type * next;
1214 struct list_head fs_supers;
1217 struct super_block *get_sb_bdev(struct file_system_type *fs_type,
1218 int flags, const char *dev_name, void *data,
1219 int (*fill_super)(struct super_block *, void *, int));
1220 struct super_block *get_sb_single(struct file_system_type *fs_type,
1221 int flags, void *data,
1222 int (*fill_super)(struct super_block *, void *, int));
1223 struct super_block *get_sb_nodev(struct file_system_type *fs_type,
1224 int flags, void *data,
1225 int (*fill_super)(struct super_block *, void *, int));
1226 void generic_shutdown_super(struct super_block *sb);
1227 void kill_block_super(struct super_block *sb);
1228 void kill_anon_super(struct super_block *sb);
1229 void kill_litter_super(struct super_block *sb);
1230 void deactivate_super(struct super_block *sb);
1231 int set_anon_super(struct super_block *s, void *data);
1232 struct super_block *sget(struct file_system_type *type,
1233 int (*test)(struct super_block *,void *),
1234 int (*set)(struct super_block *,void *),
1236 struct super_block *get_sb_pseudo(struct file_system_type *, char *,
1237 struct super_operations *ops, unsigned long);
1238 int __put_super(struct super_block *sb);
1239 int __put_super_and_need_restart(struct super_block *sb);
1240 void unnamed_dev_init(void);
1242 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1243 #define fops_get(fops) \
1244 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1245 #define fops_put(fops) \
1246 do { if (fops) module_put((fops)->owner); } while(0)
1248 extern int register_filesystem(struct file_system_type *);
1249 extern int unregister_filesystem(struct file_system_type *);
1250 extern struct vfsmount *kern_mount(struct file_system_type *);
1251 extern int may_umount_tree(struct vfsmount *);
1252 extern int may_umount(struct vfsmount *);
1253 extern long do_mount(char *, char *, char *, unsigned long, void *);
1255 extern int vfs_statfs(struct super_block *, struct kstatfs *);
1257 #define FLOCK_VERIFY_READ 1
1258 #define FLOCK_VERIFY_WRITE 2
1260 extern int locks_mandatory_locked(struct inode *);
1261 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1264 * Candidates for mandatory locking have the setgid bit set
1265 * but no group execute bit - an otherwise meaningless combination.
1267 #define MANDATORY_LOCK(inode) \
1268 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1270 static inline int locks_verify_locked(struct inode *inode)
1272 if (MANDATORY_LOCK(inode))
1273 return locks_mandatory_locked(inode);
1277 extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1279 static inline int locks_verify_truncate(struct inode *inode,
1283 if (inode->i_flock && MANDATORY_LOCK(inode))
1284 return locks_mandatory_area(
1285 FLOCK_VERIFY_WRITE, inode, filp,
1286 size < inode->i_size ? size : inode->i_size,
1287 (size < inode->i_size ? inode->i_size - size
1288 : size - inode->i_size)
1293 static inline int break_lease(struct inode *inode, unsigned int mode)
1296 return __break_lease(inode, mode);
1302 extern int do_truncate(struct dentry *, loff_t start, struct file *filp);
1303 extern long do_sys_open(const char __user *filename, int flags, int mode);
1304 extern struct file *filp_open(const char *, int, int);
1305 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1306 extern int filp_close(struct file *, fl_owner_t id);
1307 extern char * getname(const char __user *);
1310 extern void __init vfs_caches_init_early(void);
1311 extern void __init vfs_caches_init(unsigned long);
1313 #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
1314 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1315 #ifndef CONFIG_AUDITSYSCALL
1316 #define putname(name) __putname(name)
1318 extern void putname(const char *name);
1321 extern int register_blkdev(unsigned int, const char *);
1322 extern int unregister_blkdev(unsigned int, const char *);
1323 extern struct block_device *bdget(dev_t);
1324 extern void bd_set_size(struct block_device *, loff_t size);
1325 extern void bd_forget(struct inode *inode);
1326 extern void bdput(struct block_device *);
1327 extern struct block_device *open_by_devnum(dev_t, unsigned);
1328 extern struct file_operations def_blk_fops;
1329 extern struct address_space_operations def_blk_aops;
1330 extern struct file_operations def_chr_fops;
1331 extern struct file_operations bad_sock_fops;
1332 extern struct file_operations def_fifo_fops;
1333 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1334 extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
1335 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1336 extern int blkdev_get(struct block_device *, mode_t, unsigned);
1337 extern int blkdev_put(struct block_device *);
1338 extern int bd_claim(struct block_device *, void *);
1339 extern void bd_release(struct block_device *);
1342 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1343 extern int register_chrdev_region(dev_t, unsigned, const char *);
1344 extern int register_chrdev(unsigned int, const char *,
1345 struct file_operations *);
1346 extern int unregister_chrdev(unsigned int, const char *);
1347 extern void unregister_chrdev_region(dev_t, unsigned);
1348 extern int chrdev_open(struct inode *, struct file *);
1350 /* fs/block_dev.c */
1351 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1352 extern const char *__bdevname(dev_t, char *buffer);
1353 extern const char *bdevname(struct block_device *bdev, char *buffer);
1354 extern struct block_device *lookup_bdev(const char *);
1355 extern struct block_device *open_bdev_excl(const char *, int, void *);
1356 extern void close_bdev_excl(struct block_device *);
1358 extern void init_special_inode(struct inode *, umode_t, dev_t);
1360 /* Invalid inode operations -- fs/bad_inode.c */
1361 extern void make_bad_inode(struct inode *);
1362 extern int is_bad_inode(struct inode *);
1364 extern struct file_operations read_fifo_fops;
1365 extern struct file_operations write_fifo_fops;
1366 extern struct file_operations rdwr_fifo_fops;
1367 extern struct file_operations read_pipe_fops;
1368 extern struct file_operations write_pipe_fops;
1369 extern struct file_operations rdwr_pipe_fops;
1371 extern int fs_may_remount_ro(struct super_block *);
1374 * return READ, READA, or WRITE
1376 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1379 * return data direction, READ or WRITE
1381 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1383 extern int check_disk_change(struct block_device *);
1384 extern int invalidate_inodes(struct super_block *);
1385 extern int __invalidate_device(struct block_device *);
1386 extern int invalidate_partition(struct gendisk *, int);
1387 unsigned long invalidate_mapping_pages(struct address_space *mapping,
1388 pgoff_t start, pgoff_t end);
1389 unsigned long invalidate_inode_pages(struct address_space *mapping);
1390 static inline void invalidate_remote_inode(struct inode *inode)
1392 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1393 S_ISLNK(inode->i_mode))
1394 invalidate_inode_pages(inode->i_mapping);
1396 extern int invalidate_inode_pages2(struct address_space *mapping);
1397 extern int invalidate_inode_pages2_range(struct address_space *mapping,
1398 pgoff_t start, pgoff_t end);
1399 extern int write_inode_now(struct inode *, int);
1400 extern int filemap_fdatawrite(struct address_space *);
1401 extern int filemap_flush(struct address_space *);
1402 extern int filemap_fdatawait(struct address_space *);
1403 extern int filemap_write_and_wait(struct address_space *mapping);
1404 extern int filemap_write_and_wait_range(struct address_space *mapping,
1405 loff_t lstart, loff_t lend);
1406 extern void sync_supers(void);
1407 extern void sync_filesystems(int wait);
1408 extern void emergency_sync(void);
1409 extern void emergency_remount(void);
1410 extern int do_remount_sb(struct super_block *sb, int flags,
1411 void *data, int force);
1412 extern sector_t bmap(struct inode *, sector_t);
1413 extern int notify_change(struct dentry *, struct iattr *);
1414 extern int permission(struct inode *, int, struct nameidata *);
1415 extern int generic_permission(struct inode *, int,
1416 int (*check_acl)(struct inode *, int));
1418 extern int get_write_access(struct inode *);
1419 extern int deny_write_access(struct file *);
1420 static inline void put_write_access(struct inode * inode)
1422 atomic_dec(&inode->i_writecount);
1424 static inline void allow_write_access(struct file *file)
1427 atomic_inc(&file->f_dentry->d_inode->i_writecount);
1429 extern int do_pipe(int *);
1431 extern int open_namei(const char *, int, int, struct nameidata *);
1432 extern int may_open(struct nameidata *, int, int);
1434 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1435 extern struct file * open_exec(const char *);
1437 /* fs/dcache.c -- generic fs support functions */
1438 extern int is_subdir(struct dentry *, struct dentry *);
1439 extern ino_t find_inode_number(struct dentry *, struct qstr *);
1441 #include <linux/err.h>
1443 /* needed for stackable file system support */
1444 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1446 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1448 extern void inode_init_once(struct inode *);
1449 extern void iput(struct inode *);
1450 extern struct inode * igrab(struct inode *);
1451 extern ino_t iunique(struct super_block *, ino_t);
1452 extern int inode_needs_sync(struct inode *inode);
1453 extern void generic_delete_inode(struct inode *inode);
1454 extern void generic_drop_inode(struct inode *inode);
1456 extern struct inode *ilookup5_nowait(struct super_block *sb,
1457 unsigned long hashval, int (*test)(struct inode *, void *),
1459 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1460 int (*test)(struct inode *, void *), void *data);
1461 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1463 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1464 extern struct inode * iget_locked(struct super_block *, unsigned long);
1465 extern void unlock_new_inode(struct inode *);
1467 static inline struct inode *iget(struct super_block *sb, unsigned long ino)
1469 struct inode *inode = iget_locked(sb, ino);
1471 if (inode && (inode->i_state & I_NEW)) {
1472 sb->s_op->read_inode(inode);
1473 unlock_new_inode(inode);
1479 extern void __iget(struct inode * inode);
1480 extern void clear_inode(struct inode *);
1481 extern void destroy_inode(struct inode *);
1482 extern struct inode *new_inode(struct super_block *);
1483 extern int remove_suid(struct dentry *);
1484 extern void remove_dquot_ref(struct super_block *, int, struct list_head *);
1485 extern struct semaphore iprune_sem;
1487 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1488 extern void remove_inode_hash(struct inode *);
1489 static inline void insert_inode_hash(struct inode *inode) {
1490 __insert_inode_hash(inode, inode->i_ino);
1493 extern struct file * get_empty_filp(void);
1494 extern void file_move(struct file *f, struct list_head *list);
1495 extern void file_kill(struct file *f);
1497 extern void submit_bio(int, struct bio *);
1498 extern int bdev_read_only(struct block_device *);
1499 extern int set_blocksize(struct block_device *, int);
1500 extern int sb_set_blocksize(struct super_block *, int);
1501 extern int sb_min_blocksize(struct super_block *, int);
1503 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1504 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1505 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1506 extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1507 extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *);
1508 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
1509 extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *);
1510 extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t);
1511 extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *);
1512 extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t);
1513 extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1514 unsigned long, loff_t *);
1515 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
1516 unsigned long *, loff_t, loff_t *, size_t, size_t);
1517 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
1518 unsigned long, loff_t, loff_t *, size_t, ssize_t);
1519 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1520 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1521 ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
1522 unsigned long nr_segs, loff_t *ppos);
1523 extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
1524 extern void do_generic_mapping_read(struct address_space *mapping,
1525 struct file_ra_state *, struct file *,
1526 loff_t *, read_descriptor_t *, read_actor_t);
1528 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1529 extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov,
1530 unsigned long nr_segs, loff_t *ppos);
1531 ssize_t generic_file_writev(struct file *filp, const struct iovec *iov,
1532 unsigned long nr_segs, loff_t *ppos);
1533 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1534 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1535 extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1536 extern int generic_file_open(struct inode * inode, struct file * filp);
1537 extern int nonseekable_open(struct inode * inode, struct file * filp);
1539 #ifdef CONFIG_FS_XIP
1540 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
1542 extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos,
1543 size_t count, read_actor_t actor,
1545 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
1546 extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
1547 size_t len, loff_t *ppos);
1548 extern int xip_truncate_page(struct address_space *mapping, loff_t from);
1550 static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
1556 static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
1557 read_descriptor_t * desc,
1560 do_generic_mapping_read(filp->f_mapping,
1568 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1569 struct block_device *bdev, const struct iovec *iov, loff_t offset,
1570 unsigned long nr_segs, get_blocks_t get_blocks, dio_iodone_t end_io,
1574 DIO_LOCKING = 1, /* need locking between buffered and direct access */
1575 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
1576 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
1579 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1580 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1581 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1582 dio_iodone_t end_io)
1584 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1585 nr_segs, get_blocks, end_io, DIO_LOCKING);
1588 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1589 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1590 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1591 dio_iodone_t end_io)
1593 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1594 nr_segs, get_blocks, end_io, DIO_NO_LOCKING);
1597 static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
1598 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1599 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1600 dio_iodone_t end_io)
1602 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1603 nr_segs, get_blocks, end_io, DIO_OWN_LOCKING);
1606 extern struct file_operations generic_ro_fops;
1608 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1610 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1611 extern int vfs_follow_link(struct nameidata *, const char *);
1612 extern int page_readlink(struct dentry *, char __user *, int);
1613 extern void *page_follow_link_light(struct dentry *, struct nameidata *);
1614 extern void page_put_link(struct dentry *, struct nameidata *, void *);
1615 extern int page_symlink(struct inode *inode, const char *symname, int len);
1616 extern struct inode_operations page_symlink_inode_operations;
1617 extern int generic_readlink(struct dentry *, char __user *, int);
1618 extern void generic_fillattr(struct inode *, struct kstat *);
1619 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1620 void inode_add_bytes(struct inode *inode, loff_t bytes);
1621 void inode_sub_bytes(struct inode *inode, loff_t bytes);
1622 loff_t inode_get_bytes(struct inode *inode);
1623 void inode_set_bytes(struct inode *inode, loff_t bytes);
1625 extern int vfs_readdir(struct file *, filldir_t, void *);
1627 extern int vfs_stat(char __user *, struct kstat *);
1628 extern int vfs_lstat(char __user *, struct kstat *);
1629 extern int vfs_fstat(unsigned int, struct kstat *);
1631 extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long);
1633 extern struct file_system_type *get_fs_type(const char *name);
1634 extern struct super_block *get_super(struct block_device *);
1635 extern struct super_block *user_get_super(dev_t);
1636 extern void drop_super(struct super_block *sb);
1638 extern int dcache_dir_open(struct inode *, struct file *);
1639 extern int dcache_dir_close(struct inode *, struct file *);
1640 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1641 extern int dcache_readdir(struct file *, void *, filldir_t);
1642 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1643 extern int simple_statfs(struct super_block *, struct kstatfs *);
1644 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1645 extern int simple_unlink(struct inode *, struct dentry *);
1646 extern int simple_rmdir(struct inode *, struct dentry *);
1647 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1648 extern int simple_sync_file(struct file *, struct dentry *, int);
1649 extern int simple_empty(struct dentry *);
1650 extern int simple_readpage(struct file *file, struct page *page);
1651 extern int simple_prepare_write(struct file *file, struct page *page,
1652 unsigned offset, unsigned to);
1653 extern int simple_commit_write(struct file *file, struct page *page,
1654 unsigned offset, unsigned to);
1656 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1657 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
1658 extern struct file_operations simple_dir_operations;
1659 extern struct inode_operations simple_dir_inode_operations;
1660 struct tree_descr { char *name; struct file_operations *ops; int mode; };
1661 struct dentry *d_alloc_name(struct dentry *, const char *);
1662 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
1663 extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count);
1664 extern void simple_release_fs(struct vfsmount **mount, int *count);
1666 extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
1668 extern int inode_change_ok(struct inode *, struct iattr *);
1669 extern int __must_check inode_setattr(struct inode *, struct iattr *);
1671 extern void inode_update_time(struct inode *inode, int ctime_too);
1673 static inline ino_t parent_ino(struct dentry *dentry)
1677 spin_lock(&dentry->d_lock);
1678 res = dentry->d_parent->d_inode->i_ino;
1679 spin_unlock(&dentry->d_lock);
1684 extern int unshare_files(void);
1686 /* Transaction based IO helpers */
1689 * An argresp is stored in an allocated page and holds the
1690 * size of the argument or response, along with its content
1692 struct simple_transaction_argresp {
1697 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
1699 char *simple_transaction_get(struct file *file, const char __user *buf,
1701 ssize_t simple_transaction_read(struct file *file, char __user *buf,
1702 size_t size, loff_t *pos);
1703 int simple_transaction_release(struct inode *inode, struct file *file);
1705 static inline void simple_transaction_set(struct file *file, size_t n)
1707 struct simple_transaction_argresp *ar = file->private_data;
1709 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
1712 * The barrier ensures that ar->size will really remain zero until
1713 * ar->data is ready for reading.
1720 * simple attribute files
1722 * These attributes behave similar to those in sysfs:
1724 * Writing to an attribute immediately sets a value, an open file can be
1725 * written to multiple times.
1727 * Reading from an attribute creates a buffer from the value that might get
1728 * read with multiple read calls. When the attribute has been read
1729 * completely, no further read calls are possible until the file is opened
1732 * All attributes contain a text representation of a numeric value
1733 * that are accessed with the get() and set() functions.
1735 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
1736 static int __fops ## _open(struct inode *inode, struct file *file) \
1738 __simple_attr_check_format(__fmt, 0ull); \
1739 return simple_attr_open(inode, file, __get, __set, __fmt); \
1741 static struct file_operations __fops = { \
1742 .owner = THIS_MODULE, \
1743 .open = __fops ## _open, \
1744 .release = simple_attr_close, \
1745 .read = simple_attr_read, \
1746 .write = simple_attr_write, \
1749 static inline void __attribute__((format(printf, 1, 2)))
1750 __simple_attr_check_format(const char *fmt, ...)
1752 /* don't do anything, just let the compiler check the arguments; */
1755 int simple_attr_open(struct inode *inode, struct file *file,
1756 u64 (*get)(void *), void (*set)(void *, u64),
1758 int simple_attr_close(struct inode *inode, struct file *file);
1759 ssize_t simple_attr_read(struct file *file, char __user *buf,
1760 size_t len, loff_t *ppos);
1761 ssize_t simple_attr_write(struct file *file, const char __user *buf,
1762 size_t len, loff_t *ppos);
1765 #ifdef CONFIG_SECURITY
1766 static inline char *alloc_secdata(void)
1768 return (char *)get_zeroed_page(GFP_KERNEL);
1771 static inline void free_secdata(void *secdata)
1773 free_page((unsigned long)secdata);
1776 static inline char *alloc_secdata(void)
1781 static inline void free_secdata(void *secdata)
1783 #endif /* CONFIG_SECURITY */
1785 #endif /* __KERNEL__ */
1786 #endif /* _LINUX_FS_H */