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_ACTIVE (1<<30)
124 #define MS_NOUSER (1<<31)
127 * Superblock flags that can be altered by MS_REMOUNT
129 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
132 * Old magic mount flag and mask
134 #define MS_MGC_VAL 0xC0ED0000
135 #define MS_MGC_MSK 0xffff0000
137 /* Inode flags - they have nothing to superblock flags now */
139 #define S_SYNC 1 /* Writes are synced at once */
140 #define S_NOATIME 2 /* Do not update access times */
141 #define S_APPEND 4 /* Append-only file */
142 #define S_IMMUTABLE 8 /* Immutable file */
143 #define S_DEAD 16 /* removed, but still open directory */
144 #define S_NOQUOTA 32 /* Inode is not counted to quota */
145 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
146 #define S_NOCMTIME 128 /* Do not update file c/mtime */
147 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
148 #define S_PRIVATE 512 /* Inode is fs-internal */
151 * Note that nosuid etc flags are inode-specific: setting some file-system
152 * flags just means all the inodes inherit those flags by default. It might be
153 * possible to override it selectively if you really wanted to with some
154 * ioctl() that is not currently implemented.
156 * Exception: MS_RDONLY is always applied to the entire file system.
158 * Unfortunately, it is possible to change a filesystems flags with it mounted
159 * with files in use. This means that all of the inodes will not have their
160 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
161 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
163 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
165 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
166 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
167 ((inode)->i_flags & S_SYNC))
168 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
169 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
170 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
172 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
173 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
174 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
175 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
177 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
178 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
179 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
180 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
182 /* the read-only stuff doesn't really belong here, but any other place is
183 probably as bad and I don't want to create yet another include file. */
185 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
186 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
187 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
188 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
189 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
190 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
191 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
192 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
193 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
194 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
195 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
196 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
198 #define BLKPG _IO(0x12,105)/* See blkpg.h */
200 /* Some people are morons. Do not use sizeof! */
202 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
203 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
204 /* This was here just to show that the number is taken -
205 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
207 /* A jump here: 108-111 have been used for various private purposes. */
208 #define BLKBSZGET _IOR(0x12,112,size_t)
209 #define BLKBSZSET _IOW(0x12,113,size_t)
210 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
211 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
212 #define BLKTRACESTART _IO(0x12,116)
213 #define BLKTRACESTOP _IO(0x12,117)
214 #define BLKTRACETEARDOWN _IO(0x12,118)
216 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
217 #define FIBMAP _IO(0x00,1) /* bmap access */
218 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
220 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
221 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
222 #define FS_IOC_GETVERSION _IOR('v', 1, long)
223 #define FS_IOC_SETVERSION _IOW('v', 2, long)
224 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
225 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
226 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
227 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
230 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
232 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
233 #define FS_UNRM_FL 0x00000002 /* Undelete */
234 #define FS_COMPR_FL 0x00000004 /* Compress file */
235 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
236 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
237 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
238 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
239 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
240 /* Reserved for compression usage... */
241 #define FS_DIRTY_FL 0x00000100
242 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
243 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
244 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
245 /* End compression flags --- maybe not all used */
246 #define FS_BTREE_FL 0x00001000 /* btree format dir */
247 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
248 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
249 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
250 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
251 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
252 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
253 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
255 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
256 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
259 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
260 #define SYNC_FILE_RANGE_WRITE 2
261 #define SYNC_FILE_RANGE_WAIT_AFTER 4
265 #include <linux/linkage.h>
266 #include <linux/wait.h>
267 #include <linux/types.h>
268 #include <linux/kdev_t.h>
269 #include <linux/dcache.h>
270 #include <linux/stat.h>
271 #include <linux/cache.h>
272 #include <linux/kobject.h>
273 #include <linux/list.h>
274 #include <linux/radix-tree.h>
275 #include <linux/prio_tree.h>
276 #include <linux/init.h>
277 #include <linux/sched.h>
278 #include <linux/mutex.h>
280 #include <asm/atomic.h>
281 #include <asm/semaphore.h>
282 #include <asm/byteorder.h>
288 struct pipe_inode_info
;
289 struct poll_table_struct
;
291 struct vm_area_struct
;
294 extern void __init
inode_init(unsigned long);
295 extern void __init
inode_init_early(void);
296 extern void __init
mnt_init(unsigned long);
297 extern void __init
files_init(unsigned long);
300 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
301 struct buffer_head
*bh_result
, int create
);
302 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
303 ssize_t bytes
, void *private);
306 * Attribute flags. These should be or-ed together to figure out what
313 #define ATTR_ATIME 16
314 #define ATTR_MTIME 32
315 #define ATTR_CTIME 64
316 #define ATTR_ATIME_SET 128
317 #define ATTR_MTIME_SET 256
318 #define ATTR_FORCE 512 /* Not a change, but a change it */
319 #define ATTR_ATTR_FLAG 1024
320 #define ATTR_KILL_SUID 2048
321 #define ATTR_KILL_SGID 4096
322 #define ATTR_FILE 8192
325 * This is the Inode Attributes structure, used for notify_change(). It
326 * uses the above definitions as flags, to know which values have changed.
327 * Also, in this manner, a Filesystem can look at only the values it cares
328 * about. Basically, these are the attributes that the VFS layer can
329 * request to change from the FS layer.
331 * Derek Atkins <warlord@MIT.EDU> 94-10-20
334 unsigned int ia_valid
;
339 struct timespec ia_atime
;
340 struct timespec ia_mtime
;
341 struct timespec ia_ctime
;
344 * Not an attribute, but an auxilary info for filesystems wanting to
345 * implement an ftruncate() like method. NOTE: filesystem should
346 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
348 struct file
*ia_file
;
352 * Includes for diskquotas.
354 #include <linux/quota.h>
357 * enum positive_aop_returns - aop return codes with specific semantics
359 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
360 * completed, that the page is still locked, and
361 * should be considered active. The VM uses this hint
362 * to return the page to the active list -- it won't
363 * be a candidate for writeback again in the near
364 * future. Other callers must be careful to unlock
365 * the page if they get this return. Returned by
368 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
369 * unlocked it and the page might have been truncated.
370 * The caller should back up to acquiring a new page and
371 * trying again. The aop will be taking reasonable
372 * precautions not to livelock. If the caller held a page
373 * reference, it should drop it before retrying. Returned
374 * by readpage(), prepare_write(), and commit_write().
376 * address_space_operation functions return these large constants to indicate
377 * special semantics to the caller. These are much larger than the bytes in a
378 * page to allow for functions that return the number of bytes operated on in a
382 enum positive_aop_returns
{
383 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
384 AOP_TRUNCATED_PAGE
= 0x80001,
388 * oh the beauties of C type declarations.
391 struct address_space
;
392 struct writeback_control
;
394 struct address_space_operations
{
395 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
396 int (*readpage
)(struct file
*, struct page
*);
397 void (*sync_page
)(struct page
*);
399 /* Write back some dirty pages from this mapping. */
400 int (*writepages
)(struct address_space
*, struct writeback_control
*);
402 /* Set a page dirty. Return true if this dirtied it */
403 int (*set_page_dirty
)(struct page
*page
);
405 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
406 struct list_head
*pages
, unsigned nr_pages
);
409 * ext3 requires that a successful prepare_write() call be followed
410 * by a commit_write() call - they must be balanced
412 int (*prepare_write
)(struct file
*, struct page
*, unsigned, unsigned);
413 int (*commit_write
)(struct file
*, struct page
*, unsigned, unsigned);
414 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
415 sector_t (*bmap
)(struct address_space
*, sector_t
);
416 void (*invalidatepage
) (struct page
*, unsigned long);
417 int (*releasepage
) (struct page
*, gfp_t
);
418 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
419 loff_t offset
, unsigned long nr_segs
);
420 struct page
* (*get_xip_page
)(struct address_space
*, sector_t
,
422 /* migrate the contents of a page to the specified target */
423 int (*migratepage
) (struct address_space
*,
424 struct page
*, struct page
*);
427 struct backing_dev_info
;
428 struct address_space
{
429 struct inode
*host
; /* owner: inode, block_device */
430 struct radix_tree_root page_tree
; /* radix tree of all pages */
431 rwlock_t tree_lock
; /* and rwlock protecting it */
432 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
433 struct prio_tree_root i_mmap
; /* tree of private and shared mappings */
434 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
435 spinlock_t i_mmap_lock
; /* protect tree, count, list */
436 unsigned int truncate_count
; /* Cover race condition with truncate */
437 unsigned long nrpages
; /* number of total pages */
438 pgoff_t writeback_index
;/* writeback starts here */
439 const struct address_space_operations
*a_ops
; /* methods */
440 unsigned long flags
; /* error bits/gfp mask */
441 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
442 spinlock_t private_lock
; /* for use by the address_space */
443 struct list_head private_list
; /* ditto */
444 struct address_space
*assoc_mapping
; /* ditto */
445 } __attribute__((aligned(sizeof(long))));
447 * On most architectures that alignment is already the case; but
448 * must be enforced here for CRIS, to let the least signficant bit
449 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
452 struct block_device
{
453 dev_t bd_dev
; /* not a kdev_t - it's a search key */
454 struct inode
* bd_inode
; /* will die */
456 struct mutex bd_mutex
; /* open/close mutex */
457 struct mutex bd_mount_mutex
; /* mount mutex */
458 struct list_head bd_inodes
;
462 struct list_head bd_holder_list
;
464 struct block_device
* bd_contains
;
465 unsigned bd_block_size
;
466 struct hd_struct
* bd_part
;
467 /* number of times partitions within this device have been opened. */
468 unsigned bd_part_count
;
470 struct gendisk
* bd_disk
;
471 struct list_head bd_list
;
472 struct backing_dev_info
*bd_inode_backing_dev_info
;
474 * Private data. You must have bd_claim'ed the block_device
475 * to use this. NOTE: bd_claim allows an owner to claim
476 * the same device multiple times, the owner must take special
477 * care to not mess up bd_private for that case.
479 unsigned long bd_private
;
483 * bdev->bd_mutex nesting subclasses for the lock validator:
489 enum bdev_bd_mutex_lock_class
498 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
501 #define PAGECACHE_TAG_DIRTY 0
502 #define PAGECACHE_TAG_WRITEBACK 1
504 int mapping_tagged(struct address_space
*mapping
, int tag
);
507 * Might pages of this file be mapped into userspace?
509 static inline int mapping_mapped(struct address_space
*mapping
)
511 return !prio_tree_empty(&mapping
->i_mmap
) ||
512 !list_empty(&mapping
->i_mmap_nonlinear
);
516 * Might pages of this file have been modified in userspace?
517 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
518 * marks vma as VM_SHARED if it is shared, and the file was opened for
519 * writing i.e. vma may be mprotected writable even if now readonly.
521 static inline int mapping_writably_mapped(struct address_space
*mapping
)
523 return mapping
->i_mmap_writable
!= 0;
527 * Use sequence counter to get consistent i_size on 32-bit processors.
529 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
530 #include <linux/seqlock.h>
531 #define __NEED_I_SIZE_ORDERED
532 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
534 #define i_size_ordered_init(inode) do { } while (0)
538 struct hlist_node i_hash
;
539 struct list_head i_list
;
540 struct list_head i_sb_list
;
541 struct list_head i_dentry
;
545 unsigned int i_nlink
;
550 struct timespec i_atime
;
551 struct timespec i_mtime
;
552 struct timespec i_ctime
;
553 unsigned int i_blkbits
;
554 unsigned long i_version
;
556 unsigned short i_bytes
;
557 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
558 struct mutex i_mutex
;
559 struct rw_semaphore i_alloc_sem
;
560 struct inode_operations
*i_op
;
561 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
562 struct super_block
*i_sb
;
563 struct file_lock
*i_flock
;
564 struct address_space
*i_mapping
;
565 struct address_space i_data
;
567 struct dquot
*i_dquot
[MAXQUOTAS
];
569 struct list_head i_devices
;
571 struct pipe_inode_info
*i_pipe
;
572 struct block_device
*i_bdev
;
579 #ifdef CONFIG_DNOTIFY
580 unsigned long i_dnotify_mask
; /* Directory notify events */
581 struct dnotify_struct
*i_dnotify
; /* for directory notifications */
584 #ifdef CONFIG_INOTIFY
585 struct list_head inotify_watches
; /* watches on this inode */
586 struct mutex inotify_mutex
; /* protects the watches list */
589 unsigned long i_state
;
590 unsigned long dirtied_when
; /* jiffies of first dirtying */
592 unsigned int i_flags
;
594 atomic_t i_writecount
;
595 #ifdef CONFIG_SECURITY
598 void *i_private
; /* fs or device private pointer */
599 #ifdef __NEED_I_SIZE_ORDERED
600 seqcount_t i_size_seqcount
;
605 * inode->i_mutex nesting subclasses for the lock validator:
607 * 0: the object of the current VFS operation
612 * The locking order between these classes is
613 * parent -> child -> normal -> xattr -> quota
615 enum inode_i_mutex_lock_class
625 * NOTE: in a 32bit arch with a preemptable kernel and
626 * an UP compile the i_size_read/write must be atomic
627 * with respect to the local cpu (unlike with preempt disabled),
628 * but they don't need to be atomic with respect to other cpus like in
629 * true SMP (so they need either to either locally disable irq around
630 * the read or for example on x86 they can be still implemented as a
631 * cmpxchg8b without the need of the lock prefix). For SMP compiles
632 * and 64bit archs it makes no difference if preempt is enabled or not.
634 static inline loff_t
i_size_read(struct inode
*inode
)
636 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
641 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
642 i_size
= inode
->i_size
;
643 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
645 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
649 i_size
= inode
->i_size
;
653 return inode
->i_size
;
658 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
660 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
661 write_seqcount_begin(&inode
->i_size_seqcount
);
662 inode
->i_size
= i_size
;
663 write_seqcount_end(&inode
->i_size_seqcount
);
664 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
666 inode
->i_size
= i_size
;
669 inode
->i_size
= i_size
;
673 static inline unsigned iminor(struct inode
*inode
)
675 return MINOR(inode
->i_rdev
);
678 static inline unsigned imajor(struct inode
*inode
)
680 return MAJOR(inode
->i_rdev
);
683 extern struct block_device
*I_BDEV(struct inode
*inode
);
686 rwlock_t lock
; /* protects pid, uid, euid fields */
687 int pid
; /* pid or -pgrp where SIGIO should be sent */
688 uid_t uid
, euid
; /* uid/euid of process setting the owner */
689 int signum
; /* posix.1b rt signal to be delivered on IO */
693 * Track a single file's readahead state
695 struct file_ra_state
{
696 unsigned long start
; /* Current window */
698 unsigned long flags
; /* ra flags RA_FLAG_xxx*/
699 unsigned long cache_hit
; /* cache hit count*/
700 unsigned long prev_page
; /* Cache last read() position */
701 unsigned long ahead_start
; /* Ahead window */
702 unsigned long ahead_size
;
703 unsigned long ra_pages
; /* Maximum readahead window */
704 unsigned long mmap_hit
; /* Cache hit stat for mmap accesses */
705 unsigned long mmap_miss
; /* Cache miss stat for mmap accesses */
707 #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
708 #define RA_FLAG_INCACHE 0x02 /* file is already in cache */
712 * fu_list becomes invalid after file_free is called and queued via
713 * fu_rcuhead for RCU freeing
716 struct list_head fu_list
;
717 struct rcu_head fu_rcuhead
;
719 struct dentry
*f_dentry
;
720 struct vfsmount
*f_vfsmnt
;
721 const struct file_operations
*f_op
;
723 unsigned int f_flags
;
726 struct fown_struct f_owner
;
727 unsigned int f_uid
, f_gid
;
728 struct file_ra_state f_ra
;
730 unsigned long f_version
;
731 #ifdef CONFIG_SECURITY
734 /* needed for tty driver, and maybe others */
738 /* Used by fs/eventpoll.c to link all the hooks to this file */
739 struct list_head f_ep_links
;
740 spinlock_t f_ep_lock
;
741 #endif /* #ifdef CONFIG_EPOLL */
742 struct address_space
*f_mapping
;
744 extern spinlock_t files_lock
;
745 #define file_list_lock() spin_lock(&files_lock);
746 #define file_list_unlock() spin_unlock(&files_lock);
748 #define get_file(x) atomic_inc(&(x)->f_count)
749 #define file_count(x) atomic_read(&(x)->f_count)
751 #define MAX_NON_LFS ((1UL<<31) - 1)
753 /* Page cache limit. The filesystems should put that into their s_maxbytes
754 limits, otherwise bad things can happen in VM. */
755 #if BITS_PER_LONG==32
756 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
757 #elif BITS_PER_LONG==64
758 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
763 #define FL_ACCESS 8 /* not trying to lock, just looking */
764 #define FL_EXISTS 16 /* when unlocking, test for existence */
765 #define FL_LEASE 32 /* lease held on this file */
766 #define FL_CLOSE 64 /* unlock on close */
767 #define FL_SLEEP 128 /* A blocking lock */
770 * The POSIX file lock owner is determined by
771 * the "struct files_struct" in the thread group
772 * (or NULL for no owner - BSD locks).
774 * Lockd stuffs a "host" pointer into this.
776 typedef struct files_struct
*fl_owner_t
;
778 struct file_lock_operations
{
779 void (*fl_insert
)(struct file_lock
*); /* lock insertion callback */
780 void (*fl_remove
)(struct file_lock
*); /* lock removal callback */
781 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
782 void (*fl_release_private
)(struct file_lock
*);
785 struct lock_manager_operations
{
786 int (*fl_compare_owner
)(struct file_lock
*, struct file_lock
*);
787 void (*fl_notify
)(struct file_lock
*); /* unblock callback */
788 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
789 void (*fl_release_private
)(struct file_lock
*);
790 void (*fl_break
)(struct file_lock
*);
791 int (*fl_mylease
)(struct file_lock
*, struct file_lock
*);
792 int (*fl_change
)(struct file_lock
**, int);
795 /* that will die - we need it for nfs_lock_info */
796 #include <linux/nfs_fs_i.h>
799 struct file_lock
*fl_next
; /* singly linked list for this inode */
800 struct list_head fl_link
; /* doubly linked list of all locks */
801 struct list_head fl_block
; /* circular list of blocked processes */
804 wait_queue_head_t fl_wait
;
805 struct file
*fl_file
;
806 unsigned char fl_flags
;
807 unsigned char fl_type
;
811 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
812 unsigned long fl_break_time
; /* for nonblocking lease breaks */
814 struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
815 struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
817 struct nfs_lock_info nfs_fl
;
818 struct nfs4_lock_info nfs4_fl
;
822 /* The following constant reflects the upper bound of the file/locking space */
824 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
825 #define OFFSET_MAX INT_LIMIT(loff_t)
826 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
829 #include <linux/fcntl.h>
831 extern int fcntl_getlk(struct file
*, struct flock __user
*);
832 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
833 struct flock __user
*);
835 #if BITS_PER_LONG == 32
836 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
837 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
838 struct flock64 __user
*);
841 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
842 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
843 extern int fcntl_getlease(struct file
*filp
);
846 extern int do_sync_file_range(struct file
*file
, loff_t offset
, loff_t endbyte
,
850 extern void locks_init_lock(struct file_lock
*);
851 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
852 extern void locks_remove_posix(struct file
*, fl_owner_t
);
853 extern void locks_remove_flock(struct file
*);
854 extern int posix_test_lock(struct file
*, struct file_lock
*, struct file_lock
*);
855 extern int posix_lock_file_conf(struct file
*, struct file_lock
*, struct file_lock
*);
856 extern int posix_lock_file(struct file
*, struct file_lock
*);
857 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
858 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
859 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
860 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
861 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
862 extern int setlease(struct file
*, long, struct file_lock
**);
863 extern int lease_modify(struct file_lock
**, int);
864 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
865 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
867 struct fasync_struct
{
870 struct fasync_struct
*fa_next
; /* singly linked list */
871 struct file
*fa_file
;
874 #define FASYNC_MAGIC 0x4601
876 /* SMP safe fasync helpers: */
877 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
878 /* can be called from interrupts */
879 extern void kill_fasync(struct fasync_struct
**, int, int);
880 /* only for net: no internal synchronization */
881 extern void __kill_fasync(struct fasync_struct
*, int, int);
883 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
884 extern void f_delown(struct file
*filp
);
885 extern int send_sigurg(struct fown_struct
*fown
);
891 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
892 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
893 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
895 extern struct list_head super_blocks
;
896 extern spinlock_t sb_lock
;
898 #define sb_entry(list) list_entry((list), struct super_block, s_list)
899 #define S_BIAS (1<<30)
901 struct list_head s_list
; /* Keep this first */
902 dev_t s_dev
; /* search index; _not_ kdev_t */
903 unsigned long s_blocksize
;
904 unsigned char s_blocksize_bits
;
905 unsigned char s_dirt
;
906 unsigned long long s_maxbytes
; /* Max file size */
907 struct file_system_type
*s_type
;
908 struct super_operations
*s_op
;
909 struct dquot_operations
*dq_op
;
910 struct quotactl_ops
*s_qcop
;
911 struct export_operations
*s_export_op
;
912 unsigned long s_flags
;
913 unsigned long s_magic
;
914 struct dentry
*s_root
;
915 struct rw_semaphore s_umount
;
921 #ifdef CONFIG_SECURITY
924 struct xattr_handler
**s_xattr
;
926 struct list_head s_inodes
; /* all inodes */
927 struct list_head s_dirty
; /* dirty inodes */
928 struct list_head s_io
; /* parked for writeback */
929 struct hlist_head s_anon
; /* anonymous dentries for (nfs) exporting */
930 struct list_head s_files
;
932 struct block_device
*s_bdev
;
933 struct list_head s_instances
;
934 struct quota_info s_dquot
; /* Diskquota specific options */
937 wait_queue_head_t s_wait_unfrozen
;
939 char s_id
[32]; /* Informational name */
941 void *s_fs_info
; /* Filesystem private info */
944 * The next field is for VFS *only*. No filesystems have any business
945 * even looking at it. You had been warned.
947 struct mutex s_vfs_rename_mutex
; /* Kludge */
949 /* Granularity of c/m/atime in ns.
950 Cannot be worse than a second */
954 extern struct timespec
current_fs_time(struct super_block
*sb
);
957 * Snapshotting support.
965 #define vfs_check_frozen(sb, level) \
966 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
968 static inline void get_fs_excl(void)
970 atomic_inc(¤t
->fs_excl
);
973 static inline void put_fs_excl(void)
975 atomic_dec(¤t
->fs_excl
);
978 static inline int has_fs_excl(void)
980 return atomic_read(¤t
->fs_excl
);
985 * Superblock locking.
987 static inline void lock_super(struct super_block
* sb
)
990 mutex_lock(&sb
->s_lock
);
993 static inline void unlock_super(struct super_block
* sb
)
996 mutex_unlock(&sb
->s_lock
);
1000 * VFS helper functions..
1002 extern int vfs_permission(struct nameidata
*, int);
1003 extern int vfs_create(struct inode
*, struct dentry
*, int, struct nameidata
*);
1004 extern int vfs_mkdir(struct inode
*, struct dentry
*, int);
1005 extern int vfs_mknod(struct inode
*, struct dentry
*, int, dev_t
);
1006 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *, int);
1007 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
1008 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1009 extern int vfs_unlink(struct inode
*, struct dentry
*);
1010 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1013 * VFS dentry helper functions.
1015 extern void dentry_unhash(struct dentry
*dentry
);
1018 * VFS file helper functions.
1020 extern int file_permission(struct file
*, int);
1025 * NOTE! These match bits 12..15 of stat.st_mode
1026 * (ie "(i_mode >> 12) & 15").
1028 #define DT_UNKNOWN 0
1038 #define OSYNC_METADATA (1<<0)
1039 #define OSYNC_DATA (1<<1)
1040 #define OSYNC_INODE (1<<2)
1041 int generic_osync_inode(struct inode
*, struct address_space
*, int);
1044 * This is the "filldir" function type, used by readdir() to let
1045 * the kernel specify what kind of dirent layout it wants to have.
1046 * This allows the kernel to read directories into kernel space or
1047 * to have different dirent layouts depending on the binary type.
1049 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, ino_t
, unsigned);
1051 struct block_device_operations
{
1052 int (*open
) (struct inode
*, struct file
*);
1053 int (*release
) (struct inode
*, struct file
*);
1054 int (*ioctl
) (struct inode
*, struct file
*, unsigned, unsigned long);
1055 long (*unlocked_ioctl
) (struct file
*, unsigned, unsigned long);
1056 long (*compat_ioctl
) (struct file
*, unsigned, unsigned long);
1057 int (*direct_access
) (struct block_device
*, sector_t
, unsigned long *);
1058 int (*media_changed
) (struct gendisk
*);
1059 int (*revalidate_disk
) (struct gendisk
*);
1060 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1061 struct module
*owner
;
1065 * "descriptor" for what we're up to with a read for sendfile().
1066 * This allows us to use the same read code yet
1067 * have multiple different users of the data that
1068 * we read from a file.
1070 * The simplest case just copies the data to user
1081 } read_descriptor_t
;
1083 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*, unsigned long, unsigned long);
1085 /* These macros are for out of kernel modules to test that
1086 * the kernel supports the unlocked_ioctl and compat_ioctl
1087 * fields in struct file_operations. */
1088 #define HAVE_COMPAT_IOCTL 1
1089 #define HAVE_UNLOCKED_IOCTL 1
1093 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1094 * can be called without the big kernel lock held in all filesystems.
1096 struct file_operations
{
1097 struct module
*owner
;
1098 loff_t (*llseek
) (struct file
*, loff_t
, int);
1099 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1100 ssize_t (*aio_read
) (struct kiocb
*, char __user
*, size_t, loff_t
);
1101 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1102 ssize_t (*aio_write
) (struct kiocb
*, const char __user
*, size_t, loff_t
);
1103 int (*readdir
) (struct file
*, void *, filldir_t
);
1104 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1105 int (*ioctl
) (struct inode
*, struct file
*, unsigned int, unsigned long);
1106 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1107 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1108 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1109 int (*open
) (struct inode
*, struct file
*);
1110 int (*flush
) (struct file
*, fl_owner_t id
);
1111 int (*release
) (struct inode
*, struct file
*);
1112 int (*fsync
) (struct file
*, struct dentry
*, int datasync
);
1113 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1114 int (*fasync
) (int, struct file
*, int);
1115 int (*lock
) (struct file
*, int, struct file_lock
*);
1116 ssize_t (*readv
) (struct file
*, const struct iovec
*, unsigned long, loff_t
*);
1117 ssize_t (*writev
) (struct file
*, const struct iovec
*, unsigned long, loff_t
*);
1118 ssize_t (*sendfile
) (struct file
*, loff_t
*, size_t, read_actor_t
, void *);
1119 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1120 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1121 int (*check_flags
)(int);
1122 int (*dir_notify
)(struct file
*filp
, unsigned long arg
);
1123 int (*flock
) (struct file
*, int, struct file_lock
*);
1124 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1125 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1128 struct inode_operations
{
1129 int (*create
) (struct inode
*,struct dentry
*,int, struct nameidata
*);
1130 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, struct nameidata
*);
1131 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1132 int (*unlink
) (struct inode
*,struct dentry
*);
1133 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1134 int (*mkdir
) (struct inode
*,struct dentry
*,int);
1135 int (*rmdir
) (struct inode
*,struct dentry
*);
1136 int (*mknod
) (struct inode
*,struct dentry
*,int,dev_t
);
1137 int (*rename
) (struct inode
*, struct dentry
*,
1138 struct inode
*, struct dentry
*);
1139 int (*readlink
) (struct dentry
*, char __user
*,int);
1140 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1141 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1142 void (*truncate
) (struct inode
*);
1143 int (*permission
) (struct inode
*, int, struct nameidata
*);
1144 int (*setattr
) (struct dentry
*, struct iattr
*);
1145 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1146 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1147 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1148 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1149 int (*removexattr
) (struct dentry
*, const char *);
1150 void (*truncate_range
)(struct inode
*, loff_t
, loff_t
);
1155 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1156 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1157 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1158 unsigned long, loff_t
*);
1159 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1160 unsigned long, loff_t
*);
1163 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
1164 * without the big kernel lock held in all filesystems.
1166 struct super_operations
{
1167 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1168 void (*destroy_inode
)(struct inode
*);
1170 void (*read_inode
) (struct inode
*);
1172 void (*dirty_inode
) (struct inode
*);
1173 int (*write_inode
) (struct inode
*, int);
1174 void (*put_inode
) (struct inode
*);
1175 void (*drop_inode
) (struct inode
*);
1176 void (*delete_inode
) (struct inode
*);
1177 void (*put_super
) (struct super_block
*);
1178 void (*write_super
) (struct super_block
*);
1179 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1180 void (*write_super_lockfs
) (struct super_block
*);
1181 void (*unlockfs
) (struct super_block
*);
1182 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1183 int (*remount_fs
) (struct super_block
*, int *, char *);
1184 void (*clear_inode
) (struct inode
*);
1185 void (*umount_begin
) (struct vfsmount
*, int);
1187 int (*show_options
)(struct seq_file
*, struct vfsmount
*);
1188 int (*show_stats
)(struct seq_file
*, struct vfsmount
*);
1190 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1191 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1195 /* Inode state bits. Protected by inode_lock. */
1196 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
1197 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
1198 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
1200 #define I_LOCK (1 << __I_LOCK)
1201 #define I_FREEING 16
1204 #define I_WILL_FREE 128
1206 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1208 extern void __mark_inode_dirty(struct inode
*, int);
1209 static inline void mark_inode_dirty(struct inode
*inode
)
1211 __mark_inode_dirty(inode
, I_DIRTY
);
1214 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1216 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1219 static inline void inode_inc_link_count(struct inode
*inode
)
1222 mark_inode_dirty(inode
);
1225 static inline void inode_dec_link_count(struct inode
*inode
)
1228 mark_inode_dirty(inode
);
1231 extern void touch_atime(struct vfsmount
*mnt
, struct dentry
*dentry
);
1232 static inline void file_accessed(struct file
*file
)
1234 if (!(file
->f_flags
& O_NOATIME
))
1235 touch_atime(file
->f_vfsmnt
, file
->f_dentry
);
1238 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1241 * struct export_operations - for nfsd to communicate with file systems
1242 * @decode_fh: decode a file handle fragment and return a &struct dentry
1243 * @encode_fh: encode a file handle fragment from a dentry
1244 * @get_name: find the name for a given inode in a given directory
1245 * @get_parent: find the parent of a given directory
1246 * @get_dentry: find a dentry for the inode given a file handle sub-fragment
1247 * @find_exported_dentry:
1248 * set by the exporting module to a standard helper function.
1251 * The export_operations structure provides a means for nfsd to communicate
1252 * with a particular exported file system - particularly enabling nfsd and
1253 * the filesystem to co-operate when dealing with file handles.
1255 * export_operations contains two basic operation for dealing with file
1256 * handles, decode_fh() and encode_fh(), and allows for some other
1257 * operations to be defined which standard helper routines use to get
1258 * specific information from the filesystem.
1260 * nfsd encodes information use to determine which filesystem a filehandle
1261 * applies to in the initial part of the file handle. The remainder, termed
1262 * a file handle fragment, is controlled completely by the filesystem. The
1263 * standard helper routines assume that this fragment will contain one or
1264 * two sub-fragments, one which identifies the file, and one which may be
1265 * used to identify the (a) directory containing the file.
1267 * In some situations, nfsd needs to get a dentry which is connected into a
1268 * specific part of the file tree. To allow for this, it passes the
1269 * function acceptable() together with a @context which can be used to see
1270 * if the dentry is acceptable. As there can be multiple dentrys for a
1271 * given file, the filesystem should check each one for acceptability before
1272 * looking for the next. As soon as an acceptable one is found, it should
1276 * @decode_fh is given a &struct super_block (@sb), a file handle fragment
1277 * (@fh, @fh_len) and an acceptability testing function (@acceptable,
1278 * @context). It should return a &struct dentry which refers to the same
1279 * file that the file handle fragment refers to, and which passes the
1280 * acceptability test. If it cannot, it should return a %NULL pointer if
1281 * the file was found but no acceptable &dentries were available, or a
1282 * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
1286 * @encode_fh should store in the file handle fragment @fh (using at most
1287 * @max_len bytes) information that can be used by @decode_fh to recover the
1288 * file refered to by the &struct dentry @de. If the @connectable flag is
1289 * set, the encode_fh() should store sufficient information so that a good
1290 * attempt can be made to find not only the file but also it's place in the
1291 * filesystem. This typically means storing a reference to de->d_parent in
1292 * the filehandle fragment. encode_fh() should return the number of bytes
1293 * stored or a negative error code such as %-ENOSPC
1296 * @get_name should find a name for the given @child in the given @parent
1297 * directory. The name should be stored in the @name (with the
1298 * understanding that it is already pointing to a a %NAME_MAX+1 sized
1299 * buffer. get_name() should return %0 on success, a negative error code
1300 * or error. @get_name will be called without @parent->i_mutex held.
1303 * @get_parent should find the parent directory for the given @child which
1304 * is also a directory. In the event that it cannot be found, or storage
1305 * space cannot be allocated, a %ERR_PTR should be returned.
1308 * Given a &super_block (@sb) and a pointer to a file-system specific inode
1309 * identifier, possibly an inode number, (@inump) get_dentry() should find
1310 * the identified inode and return a dentry for that inode. Any suitable
1311 * dentry can be returned including, if necessary, a new dentry created with
1312 * d_alloc_root. The caller can then find any other extant dentrys by
1313 * following the d_alias links. If a new dentry was created using
1314 * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
1315 * should be d_rehash()ed.
1317 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
1318 * can be returned. The @inump will be whatever was passed to
1319 * nfsd_find_fh_dentry() in either the @obj or @parent parameters.
1322 * get_parent is called with child->d_inode->i_mutex down
1323 * get_name is not (which is possibly inconsistent)
1326 struct export_operations
{
1327 struct dentry
*(*decode_fh
)(struct super_block
*sb
, __u32
*fh
, int fh_len
, int fh_type
,
1328 int (*acceptable
)(void *context
, struct dentry
*de
),
1330 int (*encode_fh
)(struct dentry
*de
, __u32
*fh
, int *max_len
,
1333 /* the following are only called from the filesystem itself */
1334 int (*get_name
)(struct dentry
*parent
, char *name
,
1335 struct dentry
*child
);
1336 struct dentry
* (*get_parent
)(struct dentry
*child
);
1337 struct dentry
* (*get_dentry
)(struct super_block
*sb
, void *inump
);
1339 /* This is set by the exporting module to a standard helper */
1340 struct dentry
* (*find_exported_dentry
)(
1341 struct super_block
*sb
, void *obj
, void *parent
,
1342 int (*acceptable
)(void *context
, struct dentry
*de
),
1348 extern struct dentry
*
1349 find_exported_dentry(struct super_block
*sb
, void *obj
, void *parent
,
1350 int (*acceptable
)(void *context
, struct dentry
*de
),
1353 struct file_system_type
{
1356 int (*get_sb
) (struct file_system_type
*, int,
1357 const char *, void *, struct vfsmount
*);
1358 void (*kill_sb
) (struct super_block
*);
1359 struct module
*owner
;
1360 struct file_system_type
* next
;
1361 struct list_head fs_supers
;
1362 struct lock_class_key s_lock_key
;
1363 struct lock_class_key s_umount_key
;
1366 extern int get_sb_bdev(struct file_system_type
*fs_type
,
1367 int flags
, const char *dev_name
, void *data
,
1368 int (*fill_super
)(struct super_block
*, void *, int),
1369 struct vfsmount
*mnt
);
1370 extern int get_sb_single(struct file_system_type
*fs_type
,
1371 int flags
, void *data
,
1372 int (*fill_super
)(struct super_block
*, void *, int),
1373 struct vfsmount
*mnt
);
1374 extern int get_sb_nodev(struct file_system_type
*fs_type
,
1375 int flags
, void *data
,
1376 int (*fill_super
)(struct super_block
*, void *, int),
1377 struct vfsmount
*mnt
);
1378 void generic_shutdown_super(struct super_block
*sb
);
1379 void kill_block_super(struct super_block
*sb
);
1380 void kill_anon_super(struct super_block
*sb
);
1381 void kill_litter_super(struct super_block
*sb
);
1382 void deactivate_super(struct super_block
*sb
);
1383 int set_anon_super(struct super_block
*s
, void *data
);
1384 struct super_block
*sget(struct file_system_type
*type
,
1385 int (*test
)(struct super_block
*,void *),
1386 int (*set
)(struct super_block
*,void *),
1388 extern int get_sb_pseudo(struct file_system_type
*, char *,
1389 struct super_operations
*ops
, unsigned long,
1390 struct vfsmount
*mnt
);
1391 extern int simple_set_mnt(struct vfsmount
*mnt
, struct super_block
*sb
);
1392 int __put_super(struct super_block
*sb
);
1393 int __put_super_and_need_restart(struct super_block
*sb
);
1394 void unnamed_dev_init(void);
1396 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1397 #define fops_get(fops) \
1398 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1399 #define fops_put(fops) \
1400 do { if (fops) module_put((fops)->owner); } while(0)
1402 extern int register_filesystem(struct file_system_type
*);
1403 extern int unregister_filesystem(struct file_system_type
*);
1404 extern struct vfsmount
*kern_mount(struct file_system_type
*);
1405 extern int may_umount_tree(struct vfsmount
*);
1406 extern int may_umount(struct vfsmount
*);
1407 extern void umount_tree(struct vfsmount
*, int, struct list_head
*);
1408 extern void release_mounts(struct list_head
*);
1409 extern long do_mount(char *, char *, char *, unsigned long, void *);
1410 extern struct vfsmount
*copy_tree(struct vfsmount
*, struct dentry
*, int);
1411 extern void mnt_set_mountpoint(struct vfsmount
*, struct dentry
*,
1414 extern int vfs_statfs(struct dentry
*, struct kstatfs
*);
1417 extern struct subsystem fs_subsys
;
1419 #define FLOCK_VERIFY_READ 1
1420 #define FLOCK_VERIFY_WRITE 2
1422 extern int locks_mandatory_locked(struct inode
*);
1423 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1426 * Candidates for mandatory locking have the setgid bit set
1427 * but no group execute bit - an otherwise meaningless combination.
1429 #define MANDATORY_LOCK(inode) \
1430 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1432 static inline int locks_verify_locked(struct inode
*inode
)
1434 if (MANDATORY_LOCK(inode
))
1435 return locks_mandatory_locked(inode
);
1439 extern int rw_verify_area(int, struct file
*, loff_t
*, size_t);
1441 static inline int locks_verify_truncate(struct inode
*inode
,
1445 if (inode
->i_flock
&& MANDATORY_LOCK(inode
))
1446 return locks_mandatory_area(
1447 FLOCK_VERIFY_WRITE
, inode
, filp
,
1448 size
< inode
->i_size
? size
: inode
->i_size
,
1449 (size
< inode
->i_size
? inode
->i_size
- size
1450 : size
- inode
->i_size
)
1455 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1458 return __break_lease(inode
, mode
);
1464 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
1466 extern long do_sys_open(int fdf
, const char __user
*filename
, int flags
,
1468 extern struct file
*filp_open(const char *, int, int);
1469 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int);
1470 extern int filp_close(struct file
*, fl_owner_t id
);
1471 extern char * getname(const char __user
*);
1474 extern void __init
vfs_caches_init_early(void);
1475 extern void __init
vfs_caches_init(unsigned long);
1477 #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
1478 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1479 #ifndef CONFIG_AUDITSYSCALL
1480 #define putname(name) __putname(name)
1482 extern void putname(const char *name
);
1486 extern int register_blkdev(unsigned int, const char *);
1487 extern int unregister_blkdev(unsigned int, const char *);
1488 extern struct block_device
*bdget(dev_t
);
1489 extern void bd_set_size(struct block_device
*, loff_t size
);
1490 extern void bd_forget(struct inode
*inode
);
1491 extern void bdput(struct block_device
*);
1492 extern struct block_device
*open_by_devnum(dev_t
, unsigned);
1493 extern struct block_device
*open_partition_by_devnum(dev_t
, unsigned);
1494 extern const struct address_space_operations def_blk_aops
;
1496 static inline void bd_forget(struct inode
*inode
) {}
1498 extern const struct file_operations def_blk_fops
;
1499 extern const struct file_operations def_chr_fops
;
1500 extern const struct file_operations bad_sock_fops
;
1501 extern const struct file_operations def_fifo_fops
;
1503 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
1504 extern int blkdev_ioctl(struct inode
*, struct file
*, unsigned, unsigned long);
1505 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
1506 extern int blkdev_get(struct block_device
*, mode_t
, unsigned);
1507 extern int blkdev_put(struct block_device
*);
1508 extern int blkdev_put_partition(struct block_device
*);
1509 extern int bd_claim(struct block_device
*, void *);
1510 extern void bd_release(struct block_device
*);
1512 extern int bd_claim_by_disk(struct block_device
*, void *, struct gendisk
*);
1513 extern void bd_release_from_disk(struct block_device
*, struct gendisk
*);
1515 #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1516 #define bd_release_from_disk(bdev, disk) bd_release(bdev)
1521 #define CHRDEV_MAJOR_HASH_SIZE 255
1522 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
1523 extern int register_chrdev_region(dev_t
, unsigned, const char *);
1524 extern int register_chrdev(unsigned int, const char *,
1525 const struct file_operations
*);
1526 extern int unregister_chrdev(unsigned int, const char *);
1527 extern void unregister_chrdev_region(dev_t
, unsigned);
1528 extern int chrdev_open(struct inode
*, struct file
*);
1529 extern void chrdev_show(struct seq_file
*,off_t
);
1531 /* fs/block_dev.c */
1532 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1535 #define BLKDEV_MAJOR_HASH_SIZE 255
1536 extern const char *__bdevname(dev_t
, char *buffer
);
1537 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
1538 extern struct block_device
*lookup_bdev(const char *);
1539 extern struct block_device
*open_bdev_excl(const char *, int, void *);
1540 extern void close_bdev_excl(struct block_device
*);
1541 extern void blkdev_show(struct seq_file
*,off_t
);
1543 #define BLKDEV_MAJOR_HASH_SIZE 0
1546 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
1548 /* Invalid inode operations -- fs/bad_inode.c */
1549 extern void make_bad_inode(struct inode
*);
1550 extern int is_bad_inode(struct inode
*);
1552 extern const struct file_operations read_fifo_fops
;
1553 extern const struct file_operations write_fifo_fops
;
1554 extern const struct file_operations rdwr_fifo_fops
;
1556 extern int fs_may_remount_ro(struct super_block
*);
1560 * return READ, READA, or WRITE
1562 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1565 * return data direction, READ or WRITE
1567 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1569 extern int check_disk_change(struct block_device
*);
1570 extern int __invalidate_device(struct block_device
*);
1571 extern int invalidate_partition(struct gendisk
*, int);
1573 extern int invalidate_inodes(struct super_block
*);
1574 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
1575 pgoff_t start
, pgoff_t end
);
1576 unsigned long invalidate_inode_pages(struct address_space
*mapping
);
1577 static inline void invalidate_remote_inode(struct inode
*inode
)
1579 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
1580 S_ISLNK(inode
->i_mode
))
1581 invalidate_inode_pages(inode
->i_mapping
);
1583 extern int invalidate_inode_pages2(struct address_space
*mapping
);
1584 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
1585 pgoff_t start
, pgoff_t end
);
1586 extern int write_inode_now(struct inode
*, int);
1587 extern int filemap_fdatawrite(struct address_space
*);
1588 extern int filemap_flush(struct address_space
*);
1589 extern int filemap_fdatawait(struct address_space
*);
1590 extern int filemap_write_and_wait(struct address_space
*mapping
);
1591 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
1592 loff_t lstart
, loff_t lend
);
1593 extern int wait_on_page_writeback_range(struct address_space
*mapping
,
1594 pgoff_t start
, pgoff_t end
);
1595 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
1596 loff_t start
, loff_t end
, int sync_mode
);
1598 extern long do_fsync(struct file
*file
, int datasync
);
1599 extern void sync_supers(void);
1600 extern void sync_filesystems(int wait
);
1601 extern void __fsync_super(struct super_block
*sb
);
1602 extern void emergency_sync(void);
1603 extern void emergency_remount(void);
1604 extern int do_remount_sb(struct super_block
*sb
, int flags
,
1605 void *data
, int force
);
1607 extern sector_t
bmap(struct inode
*, sector_t
);
1609 extern int notify_change(struct dentry
*, struct iattr
*);
1610 extern int permission(struct inode
*, int, struct nameidata
*);
1611 extern int generic_permission(struct inode
*, int,
1612 int (*check_acl
)(struct inode
*, int));
1614 extern int get_write_access(struct inode
*);
1615 extern int deny_write_access(struct file
*);
1616 static inline void put_write_access(struct inode
* inode
)
1618 atomic_dec(&inode
->i_writecount
);
1620 static inline void allow_write_access(struct file
*file
)
1623 atomic_inc(&file
->f_dentry
->d_inode
->i_writecount
);
1625 extern int do_pipe(int *);
1627 extern int open_namei(int dfd
, const char *, int, int, struct nameidata
*);
1628 extern int may_open(struct nameidata
*, int, int);
1630 extern int kernel_read(struct file
*, unsigned long, char *, unsigned long);
1631 extern struct file
* open_exec(const char *);
1633 /* fs/dcache.c -- generic fs support functions */
1634 extern int is_subdir(struct dentry
*, struct dentry
*);
1635 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
1637 #include <linux/err.h>
1639 /* needed for stackable file system support */
1640 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
1642 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
1644 extern void inode_init_once(struct inode
*);
1645 extern void iput(struct inode
*);
1646 extern struct inode
* igrab(struct inode
*);
1647 extern ino_t
iunique(struct super_block
*, ino_t
);
1648 extern int inode_needs_sync(struct inode
*inode
);
1649 extern void generic_delete_inode(struct inode
*inode
);
1650 extern void generic_drop_inode(struct inode
*inode
);
1652 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
1653 unsigned long hashval
, int (*test
)(struct inode
*, void *),
1655 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
1656 int (*test
)(struct inode
*, void *), void *data
);
1657 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
1659 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
1660 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
1661 extern void unlock_new_inode(struct inode
*);
1663 static inline struct inode
*iget(struct super_block
*sb
, unsigned long ino
)
1665 struct inode
*inode
= iget_locked(sb
, ino
);
1667 if (inode
&& (inode
->i_state
& I_NEW
)) {
1668 sb
->s_op
->read_inode(inode
);
1669 unlock_new_inode(inode
);
1675 extern void __iget(struct inode
* inode
);
1676 extern void clear_inode(struct inode
*);
1677 extern void destroy_inode(struct inode
*);
1678 extern struct inode
*new_inode(struct super_block
*);
1679 extern int remove_suid(struct dentry
*);
1680 extern void remove_dquot_ref(struct super_block
*, int, struct list_head
*);
1682 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
1683 extern void remove_inode_hash(struct inode
*);
1684 static inline void insert_inode_hash(struct inode
*inode
) {
1685 __insert_inode_hash(inode
, inode
->i_ino
);
1688 extern struct file
* get_empty_filp(void);
1689 extern void file_move(struct file
*f
, struct list_head
*list
);
1690 extern void file_kill(struct file
*f
);
1693 extern void submit_bio(int, struct bio
*);
1694 extern int bdev_read_only(struct block_device
*);
1696 extern int set_blocksize(struct block_device
*, int);
1697 extern int sb_set_blocksize(struct super_block
*, int);
1698 extern int sb_min_blocksize(struct super_block
*, int);
1700 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
1701 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
1702 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
1703 extern int file_send_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
1704 extern ssize_t
generic_file_read(struct file
*, char __user
*, size_t, loff_t
*);
1705 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
1706 extern ssize_t
generic_file_write(struct file
*, const char __user
*, size_t, loff_t
*);
1707 extern ssize_t
generic_file_aio_read(struct kiocb
*, char __user
*, size_t, loff_t
);
1708 extern ssize_t
__generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
*);
1709 extern ssize_t
generic_file_aio_write(struct kiocb
*, const char __user
*, size_t, loff_t
);
1710 extern ssize_t
generic_file_aio_write_nolock(struct kiocb
*, const struct iovec
*,
1711 unsigned long, loff_t
*);
1712 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
1713 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
1714 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
1715 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
1716 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
1717 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
1718 ssize_t
generic_file_write_nolock(struct file
*file
, const struct iovec
*iov
,
1719 unsigned long nr_segs
, loff_t
*ppos
);
1720 extern ssize_t
generic_file_sendfile(struct file
*, loff_t
*, size_t, read_actor_t
, void *);
1721 extern void do_generic_mapping_read(struct address_space
*mapping
,
1722 struct file_ra_state
*, struct file
*,
1723 loff_t
*, read_descriptor_t
*, read_actor_t
);
1726 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
1727 struct pipe_inode_info
*, size_t, unsigned int);
1728 extern ssize_t
generic_file_splice_write(struct pipe_inode_info
*,
1729 struct file
*, loff_t
*, size_t, unsigned int);
1730 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
1731 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
1732 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
1733 size_t len
, unsigned int flags
);
1736 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
1737 extern ssize_t
generic_file_readv(struct file
*filp
, const struct iovec
*iov
,
1738 unsigned long nr_segs
, loff_t
*ppos
);
1739 ssize_t
generic_file_writev(struct file
*filp
, const struct iovec
*iov
,
1740 unsigned long nr_segs
, loff_t
*ppos
);
1741 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
1742 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
1743 extern loff_t
remote_llseek(struct file
*file
, loff_t offset
, int origin
);
1744 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
1745 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
1747 #ifdef CONFIG_FS_XIP
1748 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
1750 extern ssize_t
xip_file_sendfile(struct file
*in_file
, loff_t
*ppos
,
1751 size_t count
, read_actor_t actor
,
1753 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
1754 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
1755 size_t len
, loff_t
*ppos
);
1756 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
1758 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
1764 static inline void do_generic_file_read(struct file
* filp
, loff_t
*ppos
,
1765 read_descriptor_t
* desc
,
1768 do_generic_mapping_read(filp
->f_mapping
,
1777 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
1778 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
1779 unsigned long nr_segs
, get_block_t get_block
, dio_iodone_t end_io
,
1783 DIO_LOCKING
= 1, /* need locking between buffered and direct access */
1784 DIO_NO_LOCKING
, /* bdev; no locking at all between buffered/direct */
1785 DIO_OWN_LOCKING
, /* filesystem locks buffered and direct internally */
1788 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
1789 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
1790 loff_t offset
, unsigned long nr_segs
, get_block_t get_block
,
1791 dio_iodone_t end_io
)
1793 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
1794 nr_segs
, get_block
, end_io
, DIO_LOCKING
);
1797 static inline ssize_t
blockdev_direct_IO_no_locking(int rw
, struct kiocb
*iocb
,
1798 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
1799 loff_t offset
, unsigned long nr_segs
, get_block_t get_block
,
1800 dio_iodone_t end_io
)
1802 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
1803 nr_segs
, get_block
, end_io
, DIO_NO_LOCKING
);
1806 static inline ssize_t
blockdev_direct_IO_own_locking(int rw
, struct kiocb
*iocb
,
1807 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
1808 loff_t offset
, unsigned long nr_segs
, get_block_t get_block
,
1809 dio_iodone_t end_io
)
1811 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
1812 nr_segs
, get_block
, end_io
, DIO_OWN_LOCKING
);
1816 extern const struct file_operations generic_ro_fops
;
1818 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1820 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
1821 extern int vfs_follow_link(struct nameidata
*, const char *);
1822 extern int page_readlink(struct dentry
*, char __user
*, int);
1823 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
1824 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
1825 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
1827 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
1828 extern struct inode_operations page_symlink_inode_operations
;
1829 extern int generic_readlink(struct dentry
*, char __user
*, int);
1830 extern void generic_fillattr(struct inode
*, struct kstat
*);
1831 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
1832 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
1833 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
1834 loff_t
inode_get_bytes(struct inode
*inode
);
1835 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
1837 extern int vfs_readdir(struct file
*, filldir_t
, void *);
1839 extern int vfs_stat(char __user
*, struct kstat
*);
1840 extern int vfs_lstat(char __user
*, struct kstat
*);
1841 extern int vfs_stat_fd(int dfd
, char __user
*, struct kstat
*);
1842 extern int vfs_lstat_fd(int dfd
, char __user
*, struct kstat
*);
1843 extern int vfs_fstat(unsigned int, struct kstat
*);
1845 extern int vfs_ioctl(struct file
*, unsigned int, unsigned int, unsigned long);
1847 extern struct file_system_type
*get_fs_type(const char *name
);
1848 extern struct super_block
*get_super(struct block_device
*);
1849 extern struct super_block
*user_get_super(dev_t
);
1850 extern void drop_super(struct super_block
*sb
);
1852 extern int dcache_dir_open(struct inode
*, struct file
*);
1853 extern int dcache_dir_close(struct inode
*, struct file
*);
1854 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
1855 extern int dcache_readdir(struct file
*, void *, filldir_t
);
1856 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
1857 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
1858 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
1859 extern int simple_unlink(struct inode
*, struct dentry
*);
1860 extern int simple_rmdir(struct inode
*, struct dentry
*);
1861 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1862 extern int simple_sync_file(struct file
*, struct dentry
*, int);
1863 extern int simple_empty(struct dentry
*);
1864 extern int simple_readpage(struct file
*file
, struct page
*page
);
1865 extern int simple_prepare_write(struct file
*file
, struct page
*page
,
1866 unsigned offset
, unsigned to
);
1867 extern int simple_commit_write(struct file
*file
, struct page
*page
,
1868 unsigned offset
, unsigned to
);
1870 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
1871 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
1872 extern const struct file_operations simple_dir_operations
;
1873 extern struct inode_operations simple_dir_inode_operations
;
1874 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
1875 struct dentry
*d_alloc_name(struct dentry
*, const char *);
1876 extern int simple_fill_super(struct super_block
*, int, struct tree_descr
*);
1877 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
1878 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
1880 extern ssize_t
simple_read_from_buffer(void __user
*, size_t, loff_t
*, const void *, size_t);
1882 #ifdef CONFIG_MIGRATION
1883 extern int buffer_migrate_page(struct address_space
*,
1884 struct page
*, struct page
*);
1886 #define buffer_migrate_page NULL
1889 extern int inode_change_ok(struct inode
*, struct iattr
*);
1890 extern int __must_check
inode_setattr(struct inode
*, struct iattr
*);
1892 extern void file_update_time(struct file
*file
);
1894 static inline ino_t
parent_ino(struct dentry
*dentry
)
1898 spin_lock(&dentry
->d_lock
);
1899 res
= dentry
->d_parent
->d_inode
->i_ino
;
1900 spin_unlock(&dentry
->d_lock
);
1905 extern int unshare_files(void);
1907 /* Transaction based IO helpers */
1910 * An argresp is stored in an allocated page and holds the
1911 * size of the argument or response, along with its content
1913 struct simple_transaction_argresp
{
1918 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
1920 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
1922 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
1923 size_t size
, loff_t
*pos
);
1924 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
1926 static inline void simple_transaction_set(struct file
*file
, size_t n
)
1928 struct simple_transaction_argresp
*ar
= file
->private_data
;
1930 BUG_ON(n
> SIMPLE_TRANSACTION_LIMIT
);
1933 * The barrier ensures that ar->size will really remain zero until
1934 * ar->data is ready for reading.
1941 * simple attribute files
1943 * These attributes behave similar to those in sysfs:
1945 * Writing to an attribute immediately sets a value, an open file can be
1946 * written to multiple times.
1948 * Reading from an attribute creates a buffer from the value that might get
1949 * read with multiple read calls. When the attribute has been read
1950 * completely, no further read calls are possible until the file is opened
1953 * All attributes contain a text representation of a numeric value
1954 * that are accessed with the get() and set() functions.
1956 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
1957 static int __fops ## _open(struct inode *inode, struct file *file) \
1959 __simple_attr_check_format(__fmt, 0ull); \
1960 return simple_attr_open(inode, file, __get, __set, __fmt); \
1962 static struct file_operations __fops = { \
1963 .owner = THIS_MODULE, \
1964 .open = __fops ## _open, \
1965 .release = simple_attr_close, \
1966 .read = simple_attr_read, \
1967 .write = simple_attr_write, \
1970 static inline void __attribute__((format(printf
, 1, 2)))
1971 __simple_attr_check_format(const char *fmt
, ...)
1973 /* don't do anything, just let the compiler check the arguments; */
1976 int simple_attr_open(struct inode
*inode
, struct file
*file
,
1977 u64 (*get
)(void *), void (*set
)(void *, u64
),
1979 int simple_attr_close(struct inode
*inode
, struct file
*file
);
1980 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
1981 size_t len
, loff_t
*ppos
);
1982 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
1983 size_t len
, loff_t
*ppos
);
1986 #ifdef CONFIG_SECURITY
1987 static inline char *alloc_secdata(void)
1989 return (char *)get_zeroed_page(GFP_KERNEL
);
1992 static inline void free_secdata(void *secdata
)
1994 free_page((unsigned long)secdata
);
1997 static inline char *alloc_secdata(void)
2002 static inline void free_secdata(void *secdata
)
2004 #endif /* CONFIG_SECURITY */
2006 #endif /* __KERNEL__ */
2007 #endif /* _LINUX_FS_H */