5 * This file has definitions for some important file table
9 #include <linux/limits.h>
10 #include <linux/ioctl.h>
13 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
14 * the file limit at runtime and only root can increase the per-process
15 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
16 * upper limit on files-per-process.
18 * Some programs (notably those using select()) may have to be
19 * recompiled to take full advantage of the new limits..
22 /* Fixed constants first: */
24 #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
25 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
27 #define BLOCK_SIZE_BITS 10
28 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
30 #define SEEK_SET 0 /* seek relative to beginning of file */
31 #define SEEK_CUR 1 /* seek relative to current file position */
32 #define SEEK_END 2 /* seek relative to end of file */
34 /* And dynamically-tunable limits and defaults: */
35 struct files_stat_struct {
36 int nr_files; /* read only */
37 int nr_free_files; /* read only */
38 int max_files; /* tunable */
40 extern struct files_stat_struct files_stat;
41 extern int get_max_files(void);
43 struct inodes_stat_t {
48 extern struct inodes_stat_t inodes_stat;
50 extern int leases_enable, lease_break_time;
53 extern int dir_notify_enable;
56 #define NR_FILE 8192 /* this can well be larger on a larger system */
66 /* Internal kernel extensions */
69 #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
71 /* File is being opened for execution. Primary users of this flag are
72 distributed filesystems that can use it to achieve correct ETXTBUSY
73 behavior for cross-node execution/opening_for_writing of files */
80 #define READA 2 /* read-ahead - don't block if no resources */
81 #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
82 #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
83 #define READ_META (READ | (1 << BIO_RW_META))
84 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
85 #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
91 /* public flags for file_system_type */
92 #define FS_REQUIRES_DEV 1
93 #define FS_BINARY_MOUNTDATA 2
94 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
95 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
96 * during rename() internally.
100 * These are the fs-independent mount-flags: up to 32 flags are supported
102 #define MS_RDONLY 1 /* Mount read-only */
103 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
104 #define MS_NODEV 4 /* Disallow access to device special files */
105 #define MS_NOEXEC 8 /* Disallow program execution */
106 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
107 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
108 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
109 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
110 #define MS_NOATIME 1024 /* Do not update access times. */
111 #define MS_NODIRATIME 2048 /* Do not update directory access times */
115 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
116 MS_VERBOSE is deprecated. */
117 #define MS_SILENT 32768
118 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
119 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
120 #define MS_PRIVATE (1<<18) /* change to private */
121 #define MS_SLAVE (1<<19) /* change to slave */
122 #define MS_SHARED (1<<20) /* change to shared */
123 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
124 #define MS_TAGGED (1<<24) /* use generic inode tagging */
125 #define MS_TAGID (1<<25) /* use specific tag for this mount */
126 #define MS_ACTIVE (1<<30)
127 #define MS_NOUSER (1<<31)
130 * Superblock flags that can be altered by MS_REMOUNT
132 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
135 * Old magic mount flag and mask
137 #define MS_MGC_VAL 0xC0ED0000
138 #define MS_MGC_MSK 0xffff0000
140 /* Inode flags - they have nothing to superblock flags now */
142 #define S_SYNC 1 /* Writes are synced at once */
143 #define S_NOATIME 2 /* Do not update access times */
144 #define S_APPEND 4 /* Append-only file */
145 #define S_IMMUTABLE 8 /* Immutable file */
146 #define S_DEAD 16 /* removed, but still open directory */
147 #define S_NOQUOTA 32 /* Inode is not counted to quota */
148 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
149 #define S_NOCMTIME 128 /* Do not update file c/mtime */
150 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
151 #define S_PRIVATE 512 /* Inode is fs-internal */
152 #define S_BARRIER 1024 /* Barrier for chroot() */
153 #define S_IUNLINK 2048 /* Immutable unlink */
156 * Note that nosuid etc flags are inode-specific: setting some file-system
157 * flags just means all the inodes inherit those flags by default. It might be
158 * possible to override it selectively if you really wanted to with some
159 * ioctl() that is not currently implemented.
161 * Exception: MS_RDONLY is always applied to the entire file system.
163 * Unfortunately, it is possible to change a filesystems flags with it mounted
164 * with files in use. This means that all of the inodes will not have their
165 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
166 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
168 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
170 #define IS_RDONLY(inode) __IS_FLG(inode, MS_RDONLY)
171 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
172 ((inode)->i_flags & S_SYNC))
173 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
174 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
175 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
176 #define IS_TAGGED(inode) __IS_FLG(inode, MS_TAGGED)
178 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
179 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
180 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
181 #define IS_IUNLINK(inode) ((inode)->i_flags & S_IUNLINK)
182 #define IS_IXORUNLINK(inode) ((IS_IUNLINK(inode) ? S_IMMUTABLE : 0) ^ IS_IMMUTABLE(inode))
183 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
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)
189 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
191 #ifdef CONFIG_VSERVER_COWBL
192 # define IS_COW(inode) (IS_IUNLINK(inode) && IS_IMMUTABLE(inode))
193 # define IS_COW_LINK(inode) (S_ISREG((inode)->i_mode) && ((inode)->i_nlink > 1))
195 # define IS_COW(inode) (0)
196 # define IS_COW_LINK(inode) (0)
199 /* the read-only stuff doesn't really belong here, but any other place is
200 probably as bad and I don't want to create yet another include file. */
202 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
203 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
204 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
205 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
206 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
207 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
208 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
209 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
210 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
211 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
212 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
213 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
215 #define BLKPG _IO(0x12,105)/* See blkpg.h */
217 /* Some people are morons. Do not use sizeof! */
219 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
220 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
221 /* This was here just to show that the number is taken -
222 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
224 /* A jump here: 108-111 have been used for various private purposes. */
225 #define BLKBSZGET _IOR(0x12,112,size_t)
226 #define BLKBSZSET _IOW(0x12,113,size_t)
227 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
228 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
229 #define BLKTRACESTART _IO(0x12,116)
230 #define BLKTRACESTOP _IO(0x12,117)
231 #define BLKTRACETEARDOWN _IO(0x12,118)
233 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
234 #define FIBMAP _IO(0x00,1) /* bmap access */
235 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
237 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
238 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
239 #define FS_IOC_GETVERSION _IOR('v', 1, long)
240 #define FS_IOC_SETVERSION _IOW('v', 2, long)
241 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
242 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
243 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
244 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
247 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
249 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
250 #define FS_UNRM_FL 0x00000002 /* Undelete */
251 #define FS_COMPR_FL 0x00000004 /* Compress file */
252 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
253 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
254 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
255 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
256 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
257 /* Reserved for compression usage... */
258 #define FS_DIRTY_FL 0x00000100
259 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
260 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
261 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
262 /* End compression flags --- maybe not all used */
263 #define FS_BTREE_FL 0x00001000 /* btree format dir */
264 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
265 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
266 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
267 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
268 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
269 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
270 #define FS_EXTENT_FL 0x00080000 /* Extents */
271 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
272 #define FS_BARRIER_FL 0x04000000 /* Barrier for chroot() */
273 #define FS_IUNLINK_FL 0x08000000 /* Immutable unlink */
274 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
276 #ifdef CONFIG_VSERVER_LEGACY
277 #define FS_FL_USER_VISIBLE 0x0803DFFF /* User visible flags */
278 #define FS_FL_USER_MODIFIABLE 0x080380FF /* User modifiable flags */
280 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
281 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
284 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
285 #define SYNC_FILE_RANGE_WRITE 2
286 #define SYNC_FILE_RANGE_WAIT_AFTER 4
290 #include <linux/linkage.h>
291 #include <linux/wait.h>
292 #include <linux/types.h>
293 #include <linux/kdev_t.h>
294 #include <linux/dcache.h>
295 #include <linux/namei.h>
296 #include <linux/stat.h>
297 #include <linux/cache.h>
298 #include <linux/kobject.h>
299 #include <linux/list.h>
300 #include <linux/radix-tree.h>
301 #include <linux/prio_tree.h>
302 #include <linux/init.h>
303 #include <linux/pid.h>
304 #include <linux/mutex.h>
306 #include <asm/atomic.h>
307 #include <asm/semaphore.h>
308 #include <asm/byteorder.h>
314 struct pipe_inode_info;
315 struct poll_table_struct;
317 struct vm_area_struct;
320 extern void __init inode_init(unsigned long);
321 extern void __init inode_init_early(void);
322 extern void __init mnt_init(unsigned long);
323 extern void __init files_init(unsigned long);
326 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
327 struct buffer_head *bh_result, int create);
328 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
329 ssize_t bytes, void *private);
332 * Attribute flags. These should be or-ed together to figure out what
339 #define ATTR_ATIME 16
340 #define ATTR_MTIME 32
341 #define ATTR_CTIME 64
342 #define ATTR_ATIME_SET 128
343 #define ATTR_MTIME_SET 256
344 #define ATTR_FORCE 512 /* Not a change, but a change it */
345 #define ATTR_ATTR_FLAG 1024
346 #define ATTR_KILL_SUID 2048
347 #define ATTR_KILL_SGID 4096
348 #define ATTR_FILE 8192
349 #define ATTR_TAG 16384
352 * This is the Inode Attributes structure, used for notify_change(). It
353 * uses the above definitions as flags, to know which values have changed.
354 * Also, in this manner, a Filesystem can look at only the values it cares
355 * about. Basically, these are the attributes that the VFS layer can
356 * request to change from the FS layer.
358 * Derek Atkins <warlord@MIT.EDU> 94-10-20
361 unsigned int ia_valid;
367 struct timespec ia_atime;
368 struct timespec ia_mtime;
369 struct timespec ia_ctime;
372 * Not an attribute, but an auxilary info for filesystems wanting to
373 * implement an ftruncate() like method. NOTE: filesystem should
374 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
376 struct file *ia_file;
379 #define ATTR_FLAG_BARRIER 512 /* Barrier for chroot() */
380 #define ATTR_FLAG_IUNLINK 1024 /* Immutable unlink */
383 * Includes for diskquotas.
385 #include <linux/quota.h>
388 * enum positive_aop_returns - aop return codes with specific semantics
390 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
391 * completed, that the page is still locked, and
392 * should be considered active. The VM uses this hint
393 * to return the page to the active list -- it won't
394 * be a candidate for writeback again in the near
395 * future. Other callers must be careful to unlock
396 * the page if they get this return. Returned by
399 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
400 * unlocked it and the page might have been truncated.
401 * The caller should back up to acquiring a new page and
402 * trying again. The aop will be taking reasonable
403 * precautions not to livelock. If the caller held a page
404 * reference, it should drop it before retrying. Returned
405 * by readpage(), prepare_write(), and commit_write().
407 * address_space_operation functions return these large constants to indicate
408 * special semantics to the caller. These are much larger than the bytes in a
409 * page to allow for functions that return the number of bytes operated on in a
413 enum positive_aop_returns {
414 AOP_WRITEPAGE_ACTIVATE = 0x80000,
415 AOP_TRUNCATED_PAGE = 0x80001,
419 * oh the beauties of C type declarations.
422 struct address_space;
423 struct writeback_control;
425 struct address_space_operations {
426 int (*writepage)(struct page *page, struct writeback_control *wbc);
427 int (*readpage)(struct file *, struct page *);
428 void (*sync_page)(struct page *);
430 /* Write back some dirty pages from this mapping. */
431 int (*writepages)(struct address_space *, struct writeback_control *);
433 /* Set a page dirty. Return true if this dirtied it */
434 int (*set_page_dirty)(struct page *page);
436 int (*readpages)(struct file *filp, struct address_space *mapping,
437 struct list_head *pages, unsigned nr_pages);
440 * ext3 requires that a successful prepare_write() call be followed
441 * by a commit_write() call - they must be balanced
443 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
444 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
445 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
446 sector_t (*bmap)(struct address_space *, sector_t);
447 void (*invalidatepage) (struct page *, unsigned long);
448 int (*releasepage) (struct page *, gfp_t);
449 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
450 loff_t offset, unsigned long nr_segs);
451 struct page* (*get_xip_page)(struct address_space *, sector_t,
453 /* migrate the contents of a page to the specified target */
454 int (*migratepage) (struct address_space *,
455 struct page *, struct page *);
456 int (*launder_page) (struct page *);
459 struct backing_dev_info;
460 struct address_space {
461 struct inode *host; /* owner: inode, block_device */
462 struct radix_tree_root page_tree; /* radix tree of all pages */
463 rwlock_t tree_lock; /* and rwlock protecting it */
464 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
465 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
466 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
467 spinlock_t i_mmap_lock; /* protect tree, count, list */
468 unsigned int truncate_count; /* Cover race condition with truncate */
469 unsigned long nrpages; /* number of total pages */
470 pgoff_t writeback_index;/* writeback starts here */
471 const struct address_space_operations *a_ops; /* methods */
472 unsigned long flags; /* error bits/gfp mask */
473 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
474 spinlock_t private_lock; /* for use by the address_space */
475 struct list_head private_list; /* ditto */
476 struct address_space *assoc_mapping; /* ditto */
477 } __attribute__((aligned(sizeof(long))));
479 * On most architectures that alignment is already the case; but
480 * must be enforced here for CRIS, to let the least signficant bit
481 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
484 struct block_device {
485 dev_t bd_dev; /* not a kdev_t - it's a search key */
486 struct inode * bd_inode; /* will die */
488 struct mutex bd_mutex; /* open/close mutex */
489 struct semaphore bd_mount_sem;
490 struct list_head bd_inodes;
494 struct list_head bd_holder_list;
496 struct block_device * bd_contains;
497 unsigned bd_block_size;
498 struct hd_struct * bd_part;
499 /* number of times partitions within this device have been opened. */
500 unsigned bd_part_count;
502 struct gendisk * bd_disk;
503 struct list_head bd_list;
504 struct backing_dev_info *bd_inode_backing_dev_info;
506 * Private data. You must have bd_claim'ed the block_device
507 * to use this. NOTE: bd_claim allows an owner to claim
508 * the same device multiple times, the owner must take special
509 * care to not mess up bd_private for that case.
511 unsigned long bd_private;
515 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
518 #define PAGECACHE_TAG_DIRTY 0
519 #define PAGECACHE_TAG_WRITEBACK 1
521 int mapping_tagged(struct address_space *mapping, int tag);
524 * Might pages of this file be mapped into userspace?
526 static inline int mapping_mapped(struct address_space *mapping)
528 return !prio_tree_empty(&mapping->i_mmap) ||
529 !list_empty(&mapping->i_mmap_nonlinear);
533 * Might pages of this file have been modified in userspace?
534 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
535 * marks vma as VM_SHARED if it is shared, and the file was opened for
536 * writing i.e. vma may be mprotected writable even if now readonly.
538 static inline int mapping_writably_mapped(struct address_space *mapping)
540 return mapping->i_mmap_writable != 0;
544 * Use sequence counter to get consistent i_size on 32-bit processors.
546 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
547 #include <linux/seqlock.h>
548 #define __NEED_I_SIZE_ORDERED
549 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
551 #define i_size_ordered_init(inode) do { } while (0)
555 struct hlist_node i_hash;
556 struct list_head i_list;
557 struct list_head i_sb_list;
558 struct list_head i_dentry;
561 unsigned int i_nlink;
566 unsigned long i_version;
568 #ifdef __NEED_I_SIZE_ORDERED
569 seqcount_t i_size_seqcount;
571 struct timespec i_atime;
572 struct timespec i_mtime;
573 struct timespec i_ctime;
574 unsigned int i_blkbits;
576 unsigned short i_bytes;
578 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
579 struct mutex i_mutex;
580 struct rw_semaphore i_alloc_sem;
581 struct inode_operations *i_op;
582 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
583 struct super_block *i_sb;
584 struct file_lock *i_flock;
585 struct address_space *i_mapping;
586 struct address_space i_data;
588 struct dquot *i_dquot[MAXQUOTAS];
590 struct list_head i_devices;
592 struct pipe_inode_info *i_pipe;
593 struct block_device *i_bdev;
600 #ifdef CONFIG_DNOTIFY
601 unsigned long i_dnotify_mask; /* Directory notify events */
602 struct dnotify_struct *i_dnotify; /* for directory notifications */
605 #ifdef CONFIG_INOTIFY
606 struct list_head inotify_watches; /* watches on this inode */
607 struct mutex inotify_mutex; /* protects the watches list */
610 unsigned long i_state;
611 unsigned long dirtied_when; /* jiffies of first dirtying */
613 unsigned int i_flags;
615 atomic_t i_writecount;
616 #ifdef CONFIG_SECURITY
619 void *i_private; /* fs or device private pointer */
623 * inode->i_mutex nesting subclasses for the lock validator:
625 * 0: the object of the current VFS operation
630 * The locking order between these classes is
631 * parent -> child -> normal -> xattr -> quota
633 enum inode_i_mutex_lock_class
642 extern void inode_double_lock(struct inode *inode1, struct inode *inode2);
643 extern void inode_double_unlock(struct inode *inode1, struct inode *inode2);
646 * NOTE: in a 32bit arch with a preemptable kernel and
647 * an UP compile the i_size_read/write must be atomic
648 * with respect to the local cpu (unlike with preempt disabled),
649 * but they don't need to be atomic with respect to other cpus like in
650 * true SMP (so they need either to either locally disable irq around
651 * the read or for example on x86 they can be still implemented as a
652 * cmpxchg8b without the need of the lock prefix). For SMP compiles
653 * and 64bit archs it makes no difference if preempt is enabled or not.
655 static inline loff_t i_size_read(const struct inode *inode)
657 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
662 seq = read_seqcount_begin(&inode->i_size_seqcount);
663 i_size = inode->i_size;
664 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
666 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
670 i_size = inode->i_size;
674 return inode->i_size;
679 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
680 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
681 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
683 static inline void i_size_write(struct inode *inode, loff_t i_size)
685 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
686 write_seqcount_begin(&inode->i_size_seqcount);
687 inode->i_size = i_size;
688 write_seqcount_end(&inode->i_size_seqcount);
689 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
691 inode->i_size = i_size;
694 inode->i_size = i_size;
698 static inline unsigned iminor(const struct inode *inode)
700 return MINOR(inode->i_rdev);
703 static inline unsigned imajor(const struct inode *inode)
705 return MAJOR(inode->i_rdev);
708 extern struct block_device *I_BDEV(struct inode *inode);
711 rwlock_t lock; /* protects pid, uid, euid fields */
712 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
713 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
714 uid_t uid, euid; /* uid/euid of process setting the owner */
715 int signum; /* posix.1b rt signal to be delivered on IO */
719 * Track a single file's readahead state
721 struct file_ra_state {
722 unsigned long start; /* Current window */
724 unsigned long flags; /* ra flags RA_FLAG_xxx*/
725 unsigned long cache_hit; /* cache hit count*/
726 unsigned long prev_page; /* Cache last read() position */
727 unsigned long ahead_start; /* Ahead window */
728 unsigned long ahead_size;
729 unsigned long ra_pages; /* Maximum readahead window */
730 unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
731 unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
732 unsigned int offset; /* Offset where last read() ended in a page */
734 #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
735 #define RA_FLAG_INCACHE 0x02 /* file is already in cache */
739 * fu_list becomes invalid after file_free is called and queued via
740 * fu_rcuhead for RCU freeing
743 struct list_head fu_list;
744 struct rcu_head fu_rcuhead;
747 #define f_dentry f_path.dentry
748 #define f_vfsmnt f_path.mnt
749 const struct file_operations *f_op;
751 unsigned int f_flags;
754 struct fown_struct f_owner;
755 unsigned int f_uid, f_gid;
757 struct file_ra_state f_ra;
759 unsigned long f_version;
760 #ifdef CONFIG_SECURITY
763 /* needed for tty driver, and maybe others */
767 /* Used by fs/eventpoll.c to link all the hooks to this file */
768 struct list_head f_ep_links;
769 spinlock_t f_ep_lock;
770 #endif /* #ifdef CONFIG_EPOLL */
771 struct address_space *f_mapping;
773 extern spinlock_t files_lock;
774 #define file_list_lock() spin_lock(&files_lock);
775 #define file_list_unlock() spin_unlock(&files_lock);
777 #define get_file(x) atomic_inc(&(x)->f_count)
778 #define file_count(x) atomic_read(&(x)->f_count)
780 #define MAX_NON_LFS ((1UL<<31) - 1)
782 /* Page cache limit. The filesystems should put that into their s_maxbytes
783 limits, otherwise bad things can happen in VM. */
784 #if BITS_PER_LONG==32
785 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
786 #elif BITS_PER_LONG==64
787 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
792 #define FL_ACCESS 8 /* not trying to lock, just looking */
793 #define FL_EXISTS 16 /* when unlocking, test for existence */
794 #define FL_LEASE 32 /* lease held on this file */
795 #define FL_CLOSE 64 /* unlock on close */
796 #define FL_SLEEP 128 /* A blocking lock */
799 * The POSIX file lock owner is determined by
800 * the "struct files_struct" in the thread group
801 * (or NULL for no owner - BSD locks).
803 * Lockd stuffs a "host" pointer into this.
805 typedef struct files_struct *fl_owner_t;
807 struct file_lock_operations {
808 void (*fl_insert)(struct file_lock *); /* lock insertion callback */
809 void (*fl_remove)(struct file_lock *); /* lock removal callback */
810 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
811 void (*fl_release_private)(struct file_lock *);
814 struct lock_manager_operations {
815 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
816 void (*fl_notify)(struct file_lock *); /* unblock callback */
817 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
818 void (*fl_release_private)(struct file_lock *);
819 void (*fl_break)(struct file_lock *);
820 int (*fl_mylease)(struct file_lock *, struct file_lock *);
821 int (*fl_change)(struct file_lock **, int);
824 /* that will die - we need it for nfs_lock_info */
825 #include <linux/nfs_fs_i.h>
828 struct file_lock *fl_next; /* singly linked list for this inode */
829 struct list_head fl_link; /* doubly linked list of all locks */
830 struct list_head fl_block; /* circular list of blocked processes */
833 wait_queue_head_t fl_wait;
834 struct file *fl_file;
835 unsigned char fl_flags;
836 unsigned char fl_type;
841 struct fasync_struct * fl_fasync; /* for lease break notifications */
842 unsigned long fl_break_time; /* for nonblocking lease breaks */
844 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
845 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
847 struct nfs_lock_info nfs_fl;
848 struct nfs4_lock_info nfs4_fl;
852 /* The following constant reflects the upper bound of the file/locking space */
854 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
855 #define OFFSET_MAX INT_LIMIT(loff_t)
856 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
859 #include <linux/fcntl.h>
861 extern int fcntl_getlk(struct file *, struct flock __user *);
862 extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
863 struct flock __user *);
865 #if BITS_PER_LONG == 32
866 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
867 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
868 struct flock64 __user *);
871 extern void send_sigio(struct fown_struct *fown, int fd, int band);
872 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
873 extern int fcntl_getlease(struct file *filp);
876 extern int do_sync_file_range(struct file *file, loff_t offset, loff_t endbyte,
880 extern void locks_init_lock(struct file_lock *);
881 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
882 extern void locks_remove_posix(struct file *, fl_owner_t);
883 extern void locks_remove_flock(struct file *);
884 extern int posix_test_lock(struct file *, struct file_lock *, struct file_lock *);
885 extern int posix_lock_file_conf(struct file *, struct file_lock *, struct file_lock *);
886 extern int posix_lock_file(struct file *, struct file_lock *);
887 extern int posix_lock_file_wait(struct file *, struct file_lock *);
888 extern int posix_unblock_lock(struct file *, struct file_lock *);
889 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
890 extern int __break_lease(struct inode *inode, unsigned int flags);
891 extern void lease_get_mtime(struct inode *, struct timespec *time);
892 extern int setlease(struct file *, long, struct file_lock **);
893 extern int lease_modify(struct file_lock **, int);
894 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
895 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
897 struct fasync_struct {
900 struct fasync_struct *fa_next; /* singly linked list */
901 struct file *fa_file;
904 #define FASYNC_MAGIC 0x4601
906 /* SMP safe fasync helpers: */
907 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
908 /* can be called from interrupts */
909 extern void kill_fasync(struct fasync_struct **, int, int);
910 /* only for net: no internal synchronization */
911 extern void __kill_fasync(struct fasync_struct *, int, int);
913 extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
914 extern int f_setown(struct file *filp, unsigned long arg, int force);
915 extern void f_delown(struct file *filp);
916 extern pid_t f_getown(struct file *filp);
917 extern int send_sigurg(struct fown_struct *fown);
923 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
924 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
925 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
927 extern struct list_head super_blocks;
928 extern spinlock_t sb_lock;
930 #define sb_entry(list) list_entry((list), struct super_block, s_list)
931 #define S_BIAS (1<<30)
933 struct list_head s_list; /* Keep this first */
934 dev_t s_dev; /* search index; _not_ kdev_t */
935 unsigned long s_blocksize;
936 unsigned char s_blocksize_bits;
937 unsigned char s_dirt;
938 unsigned long long s_maxbytes; /* Max file size */
939 struct file_system_type *s_type;
940 struct super_operations *s_op;
941 struct dquot_operations *dq_op;
942 struct quotactl_ops *s_qcop;
943 struct export_operations *s_export_op;
944 unsigned long s_flags;
945 unsigned long s_magic;
946 struct dentry *s_root;
947 struct rw_semaphore s_umount;
953 #ifdef CONFIG_SECURITY
956 struct xattr_handler **s_xattr;
958 struct list_head s_inodes; /* all inodes */
959 struct list_head s_dirty; /* dirty inodes */
960 struct list_head s_io; /* parked for writeback */
961 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
962 struct list_head s_files;
964 struct block_device *s_bdev;
965 struct list_head s_instances;
966 struct quota_info s_dquot; /* Diskquota specific options */
969 wait_queue_head_t s_wait_unfrozen;
971 char s_id[32]; /* Informational name */
973 void *s_fs_info; /* Filesystem private info */
976 * The next field is for VFS *only*. No filesystems have any business
977 * even looking at it. You had been warned.
979 struct mutex s_vfs_rename_mutex; /* Kludge */
981 /* Granularity of c/m/atime in ns.
982 Cannot be worse than a second */
986 extern struct timespec current_fs_time(struct super_block *sb);
989 * Snapshotting support.
997 #define vfs_check_frozen(sb, level) \
998 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1000 #define get_fs_excl() atomic_inc(¤t->fs_excl)
1001 #define put_fs_excl() atomic_dec(¤t->fs_excl)
1002 #define has_fs_excl() atomic_read(¤t->fs_excl)
1004 /* not quite ready to be deprecated, but... */
1005 extern void lock_super(struct super_block *);
1006 extern void unlock_super(struct super_block *);
1009 * VFS helper functions..
1011 extern int vfs_permission(struct nameidata *, int);
1012 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
1013 extern int vfs_mkdir(struct inode *, struct dentry *, int, struct nameidata *);
1014 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t, struct nameidata *);
1015 extern int vfs_symlink(struct inode *, struct dentry *, const char *, int, struct nameidata *);
1016 extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct nameidata *);
1017 extern int vfs_rmdir(struct inode *, struct dentry *, struct nameidata *);
1018 extern int vfs_unlink(struct inode *, struct dentry *, struct nameidata *);
1019 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1022 * VFS dentry helper functions.
1024 extern void dentry_unhash(struct dentry *dentry);
1027 * VFS file helper functions.
1029 extern int file_permission(struct file *, int);
1034 * NOTE! These match bits 12..15 of stat.st_mode
1035 * (ie "(i_mode >> 12) & 15").
1037 #define DT_UNKNOWN 0
1047 #define OSYNC_METADATA (1<<0)
1048 #define OSYNC_DATA (1<<1)
1049 #define OSYNC_INODE (1<<2)
1050 int generic_osync_inode(struct inode *, struct address_space *, int);
1053 * This is the "filldir" function type, used by readdir() to let
1054 * the kernel specify what kind of dirent layout it wants to have.
1055 * This allows the kernel to read directories into kernel space or
1056 * to have different dirent layouts depending on the binary type.
1058 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1060 struct block_device_operations {
1061 int (*open) (struct inode *, struct file *);
1062 int (*release) (struct inode *, struct file *);
1063 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
1064 long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
1065 long (*compat_ioctl) (struct file *, unsigned, unsigned long);
1066 int (*direct_access) (struct block_device *, sector_t, unsigned long *);
1067 int (*media_changed) (struct gendisk *);
1068 int (*revalidate_disk) (struct gendisk *);
1069 int (*getgeo)(struct block_device *, struct hd_geometry *);
1070 struct module *owner;
1074 * "descriptor" for what we're up to with a read for sendfile().
1075 * This allows us to use the same read code yet
1076 * have multiple different users of the data that
1077 * we read from a file.
1079 * The simplest case just copies the data to user
1090 } read_descriptor_t;
1092 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
1094 /* These macros are for out of kernel modules to test that
1095 * the kernel supports the unlocked_ioctl and compat_ioctl
1096 * fields in struct file_operations. */
1097 #define HAVE_COMPAT_IOCTL 1
1098 #define HAVE_UNLOCKED_IOCTL 1
1102 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1103 * can be called without the big kernel lock held in all filesystems.
1105 struct file_operations {
1106 struct module *owner;
1107 loff_t (*llseek) (struct file *, loff_t, int);
1108 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
1109 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1110 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1111 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1112 int (*readdir) (struct file *, void *, filldir_t);
1113 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1114 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1115 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1116 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1117 int (*mmap) (struct file *, struct vm_area_struct *);
1118 int (*open) (struct inode *, struct file *);
1119 int (*flush) (struct file *, fl_owner_t id);
1120 int (*release) (struct inode *, struct file *);
1121 int (*fsync) (struct file *, struct dentry *, int datasync);
1122 int (*aio_fsync) (struct kiocb *, int datasync);
1123 int (*fasync) (int, struct file *, int);
1124 int (*lock) (struct file *, int, struct file_lock *);
1125 ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
1126 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1127 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1128 int (*check_flags)(int);
1129 int (*dir_notify)(struct file *filp, unsigned long arg);
1130 int (*flock) (struct file *, int, struct file_lock *);
1131 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1132 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1135 struct inode_operations {
1136 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1137 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1138 int (*link) (struct dentry *,struct inode *,struct dentry *);
1139 int (*unlink) (struct inode *,struct dentry *);
1140 int (*symlink) (struct inode *,struct dentry *,const char *);
1141 int (*mkdir) (struct inode *,struct dentry *,int);
1142 int (*rmdir) (struct inode *,struct dentry *);
1143 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1144 int (*rename) (struct inode *, struct dentry *,
1145 struct inode *, struct dentry *);
1146 int (*readlink) (struct dentry *, char __user *,int);
1147 void * (*follow_link) (struct dentry *, struct nameidata *);
1148 void (*put_link) (struct dentry *, struct nameidata *, void *);
1149 void (*truncate) (struct inode *);
1150 int (*permission) (struct inode *, int, struct nameidata *);
1151 int (*setattr) (struct dentry *, struct iattr *);
1152 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1153 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1154 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1155 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1156 int (*removexattr) (struct dentry *, const char *);
1157 void (*truncate_range)(struct inode *, loff_t, loff_t);
1158 int (*sync_flags) (struct inode *);
1163 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1164 unsigned long nr_segs, unsigned long fast_segs,
1165 struct iovec *fast_pointer,
1166 struct iovec **ret_pointer);
1168 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1169 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1170 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1171 unsigned long, loff_t *);
1172 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1173 unsigned long, loff_t *);
1174 ssize_t vfs_sendfile(struct file *, struct file *, loff_t *, size_t, loff_t);
1177 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
1178 * without the big kernel lock held in all filesystems.
1180 struct super_operations {
1181 struct inode *(*alloc_inode)(struct super_block *sb);
1182 void (*destroy_inode)(struct inode *);
1184 void (*read_inode) (struct inode *);
1186 void (*dirty_inode) (struct inode *);
1187 int (*write_inode) (struct inode *, int);
1188 void (*put_inode) (struct inode *);
1189 void (*drop_inode) (struct inode *);
1190 void (*delete_inode) (struct inode *);
1191 void (*put_super) (struct super_block *);
1192 void (*write_super) (struct super_block *);
1193 int (*sync_fs)(struct super_block *sb, int wait);
1194 void (*write_super_lockfs) (struct super_block *);
1195 void (*unlockfs) (struct super_block *);
1196 int (*statfs) (struct dentry *, struct kstatfs *);
1197 int (*remount_fs) (struct super_block *, int *, char *);
1198 void (*clear_inode) (struct inode *);
1199 void (*umount_begin) (struct vfsmount *, int);
1201 int (*show_options)(struct seq_file *, struct vfsmount *);
1202 int (*show_stats)(struct seq_file *, struct vfsmount *);
1204 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1205 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1209 /* Inode state bits. Protected by inode_lock. */
1210 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
1211 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
1212 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
1214 #define I_LOCK (1 << __I_LOCK)
1215 #define I_FREEING 16
1218 #define I_WILL_FREE 128
1220 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1222 extern void __mark_inode_dirty(struct inode *, int);
1223 static inline void mark_inode_dirty(struct inode *inode)
1225 __mark_inode_dirty(inode, I_DIRTY);
1228 static inline void mark_inode_dirty_sync(struct inode *inode)
1230 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1233 static inline void inc_nlink(struct inode *inode)
1238 static inline void inode_inc_link_count(struct inode *inode)
1241 mark_inode_dirty(inode);
1244 static inline void drop_nlink(struct inode *inode)
1249 static inline void clear_nlink(struct inode *inode)
1254 static inline void inode_dec_link_count(struct inode *inode)
1257 mark_inode_dirty(inode);
1260 extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
1261 static inline void file_accessed(struct file *file)
1263 if (!(file->f_flags & O_NOATIME))
1264 touch_atime(file->f_path.mnt, file->f_path.dentry);
1267 int sync_inode(struct inode *inode, struct writeback_control *wbc);
1270 * struct export_operations - for nfsd to communicate with file systems
1271 * @decode_fh: decode a file handle fragment and return a &struct dentry
1272 * @encode_fh: encode a file handle fragment from a dentry
1273 * @get_name: find the name for a given inode in a given directory
1274 * @get_parent: find the parent of a given directory
1275 * @get_dentry: find a dentry for the inode given a file handle sub-fragment
1276 * @find_exported_dentry:
1277 * set by the exporting module to a standard helper function.
1280 * The export_operations structure provides a means for nfsd to communicate
1281 * with a particular exported file system - particularly enabling nfsd and
1282 * the filesystem to co-operate when dealing with file handles.
1284 * export_operations contains two basic operation for dealing with file
1285 * handles, decode_fh() and encode_fh(), and allows for some other
1286 * operations to be defined which standard helper routines use to get
1287 * specific information from the filesystem.
1289 * nfsd encodes information use to determine which filesystem a filehandle
1290 * applies to in the initial part of the file handle. The remainder, termed
1291 * a file handle fragment, is controlled completely by the filesystem. The
1292 * standard helper routines assume that this fragment will contain one or
1293 * two sub-fragments, one which identifies the file, and one which may be
1294 * used to identify the (a) directory containing the file.
1296 * In some situations, nfsd needs to get a dentry which is connected into a
1297 * specific part of the file tree. To allow for this, it passes the
1298 * function acceptable() together with a @context which can be used to see
1299 * if the dentry is acceptable. As there can be multiple dentrys for a
1300 * given file, the filesystem should check each one for acceptability before
1301 * looking for the next. As soon as an acceptable one is found, it should
1305 * @decode_fh is given a &struct super_block (@sb), a file handle fragment
1306 * (@fh, @fh_len) and an acceptability testing function (@acceptable,
1307 * @context). It should return a &struct dentry which refers to the same
1308 * file that the file handle fragment refers to, and which passes the
1309 * acceptability test. If it cannot, it should return a %NULL pointer if
1310 * the file was found but no acceptable &dentries were available, or a
1311 * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
1315 * @encode_fh should store in the file handle fragment @fh (using at most
1316 * @max_len bytes) information that can be used by @decode_fh to recover the
1317 * file refered to by the &struct dentry @de. If the @connectable flag is
1318 * set, the encode_fh() should store sufficient information so that a good
1319 * attempt can be made to find not only the file but also it's place in the
1320 * filesystem. This typically means storing a reference to de->d_parent in
1321 * the filehandle fragment. encode_fh() should return the number of bytes
1322 * stored or a negative error code such as %-ENOSPC
1325 * @get_name should find a name for the given @child in the given @parent
1326 * directory. The name should be stored in the @name (with the
1327 * understanding that it is already pointing to a a %NAME_MAX+1 sized
1328 * buffer. get_name() should return %0 on success, a negative error code
1329 * or error. @get_name will be called without @parent->i_mutex held.
1332 * @get_parent should find the parent directory for the given @child which
1333 * is also a directory. In the event that it cannot be found, or storage
1334 * space cannot be allocated, a %ERR_PTR should be returned.
1337 * Given a &super_block (@sb) and a pointer to a file-system specific inode
1338 * identifier, possibly an inode number, (@inump) get_dentry() should find
1339 * the identified inode and return a dentry for that inode. Any suitable
1340 * dentry can be returned including, if necessary, a new dentry created with
1341 * d_alloc_root. The caller can then find any other extant dentrys by
1342 * following the d_alias links. If a new dentry was created using
1343 * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
1344 * should be d_rehash()ed.
1346 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
1347 * can be returned. The @inump will be whatever was passed to
1348 * nfsd_find_fh_dentry() in either the @obj or @parent parameters.
1351 * get_parent is called with child->d_inode->i_mutex down
1352 * get_name is not (which is possibly inconsistent)
1355 struct export_operations {
1356 struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
1357 int (*acceptable)(void *context, struct dentry *de),
1359 int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
1362 /* the following are only called from the filesystem itself */
1363 int (*get_name)(struct dentry *parent, char *name,
1364 struct dentry *child);
1365 struct dentry * (*get_parent)(struct dentry *child);
1366 struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
1368 /* This is set by the exporting module to a standard helper */
1369 struct dentry * (*find_exported_dentry)(
1370 struct super_block *sb, void *obj, void *parent,
1371 int (*acceptable)(void *context, struct dentry *de),
1377 extern struct dentry *
1378 find_exported_dentry(struct super_block *sb, void *obj, void *parent,
1379 int (*acceptable)(void *context, struct dentry *de),
1382 struct file_system_type {
1385 int (*get_sb) (struct file_system_type *, int,
1386 const char *, void *, struct vfsmount *);
1387 void (*kill_sb) (struct super_block *);
1388 struct module *owner;
1389 struct file_system_type * next;
1390 struct list_head fs_supers;
1391 struct lock_class_key s_lock_key;
1392 struct lock_class_key s_umount_key;
1395 extern int get_sb_bdev(struct file_system_type *fs_type,
1396 int flags, const char *dev_name, void *data,
1397 int (*fill_super)(struct super_block *, void *, int),
1398 struct vfsmount *mnt);
1399 extern int get_sb_single(struct file_system_type *fs_type,
1400 int flags, void *data,
1401 int (*fill_super)(struct super_block *, void *, int),
1402 struct vfsmount *mnt);
1403 extern int get_sb_nodev(struct file_system_type *fs_type,
1404 int flags, void *data,
1405 int (*fill_super)(struct super_block *, void *, int),
1406 struct vfsmount *mnt);
1407 void generic_shutdown_super(struct super_block *sb);
1408 void kill_block_super(struct super_block *sb);
1409 void kill_anon_super(struct super_block *sb);
1410 void kill_litter_super(struct super_block *sb);
1411 void deactivate_super(struct super_block *sb);
1412 int set_anon_super(struct super_block *s, void *data);
1413 struct super_block *sget(struct file_system_type *type,
1414 int (*test)(struct super_block *,void *),
1415 int (*set)(struct super_block *,void *),
1417 extern int get_sb_pseudo(struct file_system_type *, char *,
1418 struct super_operations *ops, unsigned long,
1419 struct vfsmount *mnt);
1420 extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
1421 int __put_super(struct super_block *sb);
1422 int __put_super_and_need_restart(struct super_block *sb);
1423 void unnamed_dev_init(void);
1425 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1426 #define fops_get(fops) \
1427 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1428 #define fops_put(fops) \
1429 do { if (fops) module_put((fops)->owner); } while(0)
1431 extern int register_filesystem(struct file_system_type *);
1432 extern int unregister_filesystem(struct file_system_type *);
1433 extern struct vfsmount *kern_mount(struct file_system_type *);
1434 extern int may_umount_tree(struct vfsmount *);
1435 extern int may_umount(struct vfsmount *);
1436 extern void umount_tree(struct vfsmount *, int, struct list_head *);
1437 extern void release_mounts(struct list_head *);
1438 extern long do_mount(char *, char *, char *, unsigned long, void *);
1439 extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
1440 extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
1443 extern int vfs_statfs(struct dentry *, struct kstatfs *);
1446 extern struct subsystem fs_subsys;
1448 #define FLOCK_VERIFY_READ 1
1449 #define FLOCK_VERIFY_WRITE 2
1451 extern int locks_mandatory_locked(struct inode *);
1452 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1455 * Candidates for mandatory locking have the setgid bit set
1456 * but no group execute bit - an otherwise meaningless combination.
1458 #define MANDATORY_LOCK(inode) \
1459 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1461 static inline int locks_verify_locked(struct inode *inode)
1463 if (MANDATORY_LOCK(inode))
1464 return locks_mandatory_locked(inode);
1468 extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1470 static inline int locks_verify_truncate(struct inode *inode,
1474 if (inode->i_flock && MANDATORY_LOCK(inode))
1475 return locks_mandatory_area(
1476 FLOCK_VERIFY_WRITE, inode, filp,
1477 size < inode->i_size ? size : inode->i_size,
1478 (size < inode->i_size ? inode->i_size - size
1479 : size - inode->i_size)
1484 static inline int break_lease(struct inode *inode, unsigned int mode)
1487 return __break_lease(inode, mode);
1493 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1495 extern long do_sys_open(int fdf, const char __user *filename, int flags,
1497 extern struct file *filp_open(const char *, int, int);
1498 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1499 extern int filp_close(struct file *, fl_owner_t id);
1500 extern char * getname(const char __user *);
1503 extern void __init vfs_caches_init_early(void);
1504 extern void __init vfs_caches_init(unsigned long);
1506 extern struct kmem_cache *names_cachep;
1508 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
1509 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1510 #ifndef CONFIG_AUDITSYSCALL
1511 #define putname(name) __putname(name)
1513 extern void putname(const char *name);
1517 extern int register_blkdev(unsigned int, const char *);
1518 extern int unregister_blkdev(unsigned int, const char *);
1519 extern struct block_device *bdget(dev_t);
1520 extern void bd_set_size(struct block_device *, loff_t size);
1521 extern void bd_forget(struct inode *inode);
1522 extern void bdput(struct block_device *);
1523 extern struct block_device *open_by_devnum(dev_t, unsigned);
1524 extern const struct address_space_operations def_blk_aops;
1526 static inline void bd_forget(struct inode *inode) {}
1528 extern const struct file_operations def_blk_fops;
1529 extern const struct file_operations def_chr_fops;
1530 extern const struct file_operations bad_sock_fops;
1531 extern const struct file_operations def_fifo_fops;
1533 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1534 extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
1535 extern int blkdev_driver_ioctl(struct inode *inode, struct file *file,
1536 struct gendisk *disk, unsigned cmd,
1538 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1539 extern int blkdev_get(struct block_device *, mode_t, unsigned);
1540 extern int blkdev_put(struct block_device *);
1541 extern int bd_claim(struct block_device *, void *);
1542 extern void bd_release(struct block_device *);
1544 extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1545 extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1547 #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1548 #define bd_release_from_disk(bdev, disk) bd_release(bdev)
1553 #define CHRDEV_MAJOR_HASH_SIZE 255
1554 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1555 extern int register_chrdev_region(dev_t, unsigned, const char *);
1556 extern int register_chrdev(unsigned int, const char *,
1557 const struct file_operations *);
1558 extern int unregister_chrdev(unsigned int, const char *);
1559 extern void unregister_chrdev_region(dev_t, unsigned);
1560 extern int chrdev_open(struct inode *, struct file *);
1561 extern void chrdev_show(struct seq_file *,off_t);
1563 /* fs/block_dev.c */
1564 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1567 #define BLKDEV_MAJOR_HASH_SIZE 255
1568 extern const char *__bdevname(dev_t, char *buffer);
1569 extern const char *bdevname(struct block_device *bdev, char *buffer);
1570 extern struct block_device *lookup_bdev(const char *);
1571 extern struct block_device *open_bdev_excl(const char *, int, void *);
1572 extern void close_bdev_excl(struct block_device *);
1573 extern void blkdev_show(struct seq_file *,off_t);
1575 #define BLKDEV_MAJOR_HASH_SIZE 0
1578 extern void init_special_inode(struct inode *, umode_t, dev_t);
1580 /* Invalid inode operations -- fs/bad_inode.c */
1581 extern void make_bad_inode(struct inode *);
1582 extern int is_bad_inode(struct inode *);
1584 extern const struct file_operations read_fifo_fops;
1585 extern const struct file_operations write_fifo_fops;
1586 extern const struct file_operations rdwr_fifo_fops;
1588 extern int fs_may_remount_ro(struct super_block *);
1592 * return READ, READA, or WRITE
1594 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1597 * return data direction, READ or WRITE
1599 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1601 extern int check_disk_change(struct block_device *);
1602 extern int __invalidate_device(struct block_device *);
1603 extern int invalidate_partition(struct gendisk *, int);
1605 extern int invalidate_inodes(struct super_block *);
1606 unsigned long invalidate_mapping_pages(struct address_space *mapping,
1607 pgoff_t start, pgoff_t end);
1608 unsigned long invalidate_inode_pages(struct address_space *mapping);
1609 static inline void invalidate_remote_inode(struct inode *inode)
1611 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1612 S_ISLNK(inode->i_mode))
1613 invalidate_inode_pages(inode->i_mapping);
1615 extern int invalidate_inode_pages2(struct address_space *mapping);
1616 extern int invalidate_inode_pages2_range(struct address_space *mapping,
1617 pgoff_t start, pgoff_t end);
1618 extern int write_inode_now(struct inode *, int);
1619 extern int filemap_fdatawrite(struct address_space *);
1620 extern int filemap_flush(struct address_space *);
1621 extern int filemap_fdatawait(struct address_space *);
1622 extern int filemap_write_and_wait(struct address_space *mapping);
1623 extern int filemap_write_and_wait_range(struct address_space *mapping,
1624 loff_t lstart, loff_t lend);
1625 extern int wait_on_page_writeback_range(struct address_space *mapping,
1626 pgoff_t start, pgoff_t end);
1627 extern int __filemap_fdatawrite_range(struct address_space *mapping,
1628 loff_t start, loff_t end, int sync_mode);
1630 extern long do_fsync(struct file *file, int datasync);
1631 extern void sync_supers(void);
1632 extern void sync_filesystems(int wait);
1633 extern void __fsync_super(struct super_block *sb);
1634 extern void emergency_sync(void);
1635 extern void emergency_remount(void);
1636 extern int do_remount_sb(struct super_block *sb, int flags,
1637 void *data, int force);
1639 extern sector_t bmap(struct inode *, sector_t);
1641 extern int notify_change(struct dentry *, struct iattr *);
1642 extern int permission(struct inode *, int, struct nameidata *);
1643 extern int generic_permission(struct inode *, int,
1644 int (*check_acl)(struct inode *, int));
1646 extern int get_write_access(struct inode *);
1647 extern int deny_write_access(struct file *);
1648 static inline void put_write_access(struct inode * inode)
1650 atomic_dec(&inode->i_writecount);
1652 static inline void allow_write_access(struct file *file)
1655 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
1657 extern int do_pipe(int *);
1658 extern struct file *create_read_pipe(struct file *f);
1659 extern struct file *create_write_pipe(void);
1660 extern void free_write_pipe(struct file *);
1662 extern int open_namei(int dfd, const char *, int, int, struct nameidata *);
1663 extern int may_open(struct nameidata *, int, int);
1665 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1666 extern struct file * open_exec(const char *);
1668 /* fs/dcache.c -- generic fs support functions */
1669 extern int is_subdir(struct dentry *, struct dentry *);
1670 extern ino_t find_inode_number(struct dentry *, struct qstr *);
1672 #include <linux/err.h>
1674 /* needed for stackable file system support */
1675 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1677 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1679 extern void inode_init_once(struct inode *);
1680 extern void iput(struct inode *);
1681 extern struct inode * igrab(struct inode *);
1682 extern ino_t iunique(struct super_block *, ino_t);
1683 extern int inode_needs_sync(struct inode *inode);
1684 extern void generic_delete_inode(struct inode *inode);
1685 extern void generic_drop_inode(struct inode *inode);
1687 extern struct inode *ilookup5_nowait(struct super_block *sb,
1688 unsigned long hashval, int (*test)(struct inode *, void *),
1690 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1691 int (*test)(struct inode *, void *), void *data);
1692 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1694 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1695 extern struct inode * iget_locked(struct super_block *, unsigned long);
1696 extern void unlock_new_inode(struct inode *);
1698 static inline struct inode *iget(struct super_block *sb, unsigned long ino)
1700 struct inode *inode = iget_locked(sb, ino);
1702 if (inode && (inode->i_state & I_NEW)) {
1703 sb->s_op->read_inode(inode);
1704 unlock_new_inode(inode);
1710 extern void __iget(struct inode * inode);
1711 extern void clear_inode(struct inode *);
1712 extern void destroy_inode(struct inode *);
1713 extern struct inode *new_inode(struct super_block *);
1714 extern int __remove_suid(struct dentry *, int);
1715 extern int should_remove_suid(struct dentry *);
1716 extern int remove_suid(struct dentry *);
1717 extern void remove_dquot_ref(struct super_block *, int, struct list_head *);
1719 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1720 extern void remove_inode_hash(struct inode *);
1721 static inline void insert_inode_hash(struct inode *inode) {
1722 __insert_inode_hash(inode, inode->i_ino);
1725 extern struct file * get_empty_filp(void);
1726 extern void file_move(struct file *f, struct list_head *list);
1727 extern void file_kill(struct file *f);
1730 extern void submit_bio(int, struct bio *);
1731 extern int bdev_read_only(struct block_device *);
1733 extern int set_blocksize(struct block_device *, int);
1734 extern int sb_set_blocksize(struct super_block *, int);
1735 extern int sb_min_blocksize(struct super_block *, int);
1737 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1738 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1739 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1740 extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1741 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
1742 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
1743 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
1744 extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1745 unsigned long, loff_t);
1746 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
1747 unsigned long *, loff_t, loff_t *, size_t, size_t);
1748 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
1749 unsigned long, loff_t, loff_t *, size_t, ssize_t);
1750 extern int generic_file_buffered_write_one_kernel_page(struct address_space *,
1751 pgoff_t, struct page *);
1752 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1753 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1754 extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
1755 extern ssize_t generic_file_sendpage(struct file *, struct page *, int, size_t, loff_t *, int);
1756 extern void do_generic_mapping_read(struct address_space *mapping,
1757 struct file_ra_state *, struct file *,
1758 loff_t *, read_descriptor_t *, read_actor_t);
1761 extern ssize_t generic_file_splice_read(struct file *, loff_t *,
1762 struct pipe_inode_info *, size_t, unsigned int);
1763 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
1764 struct file *, loff_t *, size_t, unsigned int);
1765 extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *,
1766 struct file *, loff_t *, size_t, unsigned int);
1767 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
1768 struct file *out, loff_t *, size_t len, unsigned int flags);
1769 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
1770 size_t len, unsigned int flags);
1773 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1774 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1775 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1776 extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1777 extern int generic_file_open(struct inode * inode, struct file * filp);
1778 extern int nonseekable_open(struct inode * inode, struct file * filp);
1780 #ifdef CONFIG_FS_XIP
1781 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
1783 extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos,
1784 size_t count, read_actor_t actor,
1786 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
1787 extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
1788 size_t len, loff_t *ppos);
1789 extern int xip_truncate_page(struct address_space *mapping, loff_t from);
1791 static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
1797 static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
1798 read_descriptor_t * desc,
1801 do_generic_mapping_read(filp->f_mapping,
1810 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1811 struct block_device *bdev, const struct iovec *iov, loff_t offset,
1812 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
1816 DIO_LOCKING = 1, /* need locking between buffered and direct access */
1817 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
1818 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
1821 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1822 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1823 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1824 dio_iodone_t end_io)
1826 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1827 nr_segs, get_block, end_io, DIO_LOCKING);
1830 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1831 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1832 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1833 dio_iodone_t end_io)
1835 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1836 nr_segs, get_block, end_io, DIO_NO_LOCKING);
1839 static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
1840 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1841 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1842 dio_iodone_t end_io)
1844 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1845 nr_segs, get_block, end_io, DIO_OWN_LOCKING);
1849 extern const struct file_operations generic_ro_fops;
1851 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1853 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1854 extern int vfs_follow_link(struct nameidata *, const char *);
1855 extern int page_readlink(struct dentry *, char __user *, int);
1856 extern void *page_follow_link_light(struct dentry *, struct nameidata *);
1857 extern void page_put_link(struct dentry *, struct nameidata *, void *);
1858 extern int __page_symlink(struct inode *inode, const char *symname, int len,
1860 extern int page_symlink(struct inode *inode, const char *symname, int len);
1861 extern struct inode_operations page_symlink_inode_operations;
1862 extern int generic_readlink(struct dentry *, char __user *, int);
1863 extern void generic_fillattr(struct inode *, struct kstat *);
1864 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1865 void inode_add_bytes(struct inode *inode, loff_t bytes);
1866 void inode_sub_bytes(struct inode *inode, loff_t bytes);
1867 loff_t inode_get_bytes(struct inode *inode);
1868 void inode_set_bytes(struct inode *inode, loff_t bytes);
1870 extern int vfs_readdir(struct file *, filldir_t, void *);
1872 extern int vfs_stat(char __user *, struct kstat *);
1873 extern int vfs_lstat(char __user *, struct kstat *);
1874 extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
1875 extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
1876 extern int vfs_fstat(unsigned int, struct kstat *);
1878 extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long);
1880 extern struct file_system_type *get_fs_type(const char *name);
1881 extern struct super_block *get_super(struct block_device *);
1882 extern struct super_block *user_get_super(dev_t);
1883 extern void drop_super(struct super_block *sb);
1885 extern int dcache_dir_open(struct inode *, struct file *);
1886 extern int dcache_dir_close(struct inode *, struct file *);
1887 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1888 extern int dcache_readdir(struct file *, void *, filldir_t);
1889 extern int dcache_readdir_filter(struct file *, void *, filldir_t, int (*)(struct dentry *));
1890 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1891 extern int simple_statfs(struct dentry *, struct kstatfs *);
1892 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1893 extern int simple_unlink(struct inode *, struct dentry *);
1894 extern int simple_rmdir(struct inode *, struct dentry *);
1895 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1896 extern int simple_sync_file(struct file *, struct dentry *, int);
1897 extern int simple_empty(struct dentry *);
1898 extern int simple_readpage(struct file *file, struct page *page);
1899 extern int simple_prepare_write(struct file *file, struct page *page,
1900 unsigned offset, unsigned to);
1901 extern int simple_commit_write(struct file *file, struct page *page,
1902 unsigned offset, unsigned to);
1904 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1905 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
1906 extern const struct file_operations simple_dir_operations;
1907 extern struct inode_operations simple_dir_inode_operations;
1908 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
1909 struct dentry *d_alloc_name(struct dentry *, const char *);
1910 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
1911 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
1912 extern void simple_release_fs(struct vfsmount **mount, int *count);
1914 extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
1916 #ifdef CONFIG_MIGRATION
1917 extern int buffer_migrate_page(struct address_space *,
1918 struct page *, struct page *);
1920 #define buffer_migrate_page NULL
1923 extern int inode_change_ok(struct inode *, struct iattr *);
1924 extern int __must_check inode_setattr(struct inode *, struct iattr *);
1926 extern void file_update_time(struct file *file);
1928 static inline ino_t parent_ino(struct dentry *dentry)
1932 spin_lock(&dentry->d_lock);
1933 res = dentry->d_parent->d_inode->i_ino;
1934 spin_unlock(&dentry->d_lock);
1939 extern int unshare_files(void);
1941 /* Transaction based IO helpers */
1944 * An argresp is stored in an allocated page and holds the
1945 * size of the argument or response, along with its content
1947 struct simple_transaction_argresp {
1952 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
1954 char *simple_transaction_get(struct file *file, const char __user *buf,
1956 ssize_t simple_transaction_read(struct file *file, char __user *buf,
1957 size_t size, loff_t *pos);
1958 int simple_transaction_release(struct inode *inode, struct file *file);
1960 static inline void simple_transaction_set(struct file *file, size_t n)
1962 struct simple_transaction_argresp *ar = file->private_data;
1964 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
1967 * The barrier ensures that ar->size will really remain zero until
1968 * ar->data is ready for reading.
1975 * simple attribute files
1977 * These attributes behave similar to those in sysfs:
1979 * Writing to an attribute immediately sets a value, an open file can be
1980 * written to multiple times.
1982 * Reading from an attribute creates a buffer from the value that might get
1983 * read with multiple read calls. When the attribute has been read
1984 * completely, no further read calls are possible until the file is opened
1987 * All attributes contain a text representation of a numeric value
1988 * that are accessed with the get() and set() functions.
1990 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
1991 static int __fops ## _open(struct inode *inode, struct file *file) \
1993 __simple_attr_check_format(__fmt, 0ull); \
1994 return simple_attr_open(inode, file, __get, __set, __fmt); \
1996 static struct file_operations __fops = { \
1997 .owner = THIS_MODULE, \
1998 .open = __fops ## _open, \
1999 .release = simple_attr_close, \
2000 .read = simple_attr_read, \
2001 .write = simple_attr_write, \
2004 static inline void __attribute__((format(printf, 1, 2)))
2005 __simple_attr_check_format(const char *fmt, ...)
2007 /* don't do anything, just let the compiler check the arguments; */
2010 int simple_attr_open(struct inode *inode, struct file *file,
2011 u64 (*get)(void *), void (*set)(void *, u64),
2013 int simple_attr_close(struct inode *inode, struct file *file);
2014 ssize_t simple_attr_read(struct file *file, char __user *buf,
2015 size_t len, loff_t *ppos);
2016 ssize_t simple_attr_write(struct file *file, const char __user *buf,
2017 size_t len, loff_t *ppos);
2020 #ifdef CONFIG_SECURITY
2021 static inline char *alloc_secdata(void)
2023 return (char *)get_zeroed_page(GFP_KERNEL);
2026 static inline void free_secdata(void *secdata)
2028 free_page((unsigned long)secdata);
2031 static inline char *alloc_secdata(void)
2036 static inline void free_secdata(void *secdata)
2038 #endif /* CONFIG_SECURITY */
2040 #endif /* __KERNEL__ */
2041 #endif /* _LINUX_FS_H */