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 extern int sysctl_nr_open
;
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 */
33 #define SEEK_MAX SEEK_END
35 /* And dynamically-tunable limits and defaults: */
36 struct files_stat_struct
{
37 int nr_files
; /* read only */
38 int nr_free_files
; /* read only */
39 int max_files
; /* tunable */
41 extern struct files_stat_struct files_stat
;
42 extern int get_max_files(void);
44 struct inodes_stat_t
{
47 int dummy
[5]; /* padding for sysctl ABI compatibility */
49 extern struct inodes_stat_t inodes_stat
;
51 extern int leases_enable
, lease_break_time
;
54 extern int dir_notify_enable
;
57 #define NR_FILE 8192 /* this can well be larger on a larger system */
69 /* Internal kernel extensions */
72 #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
74 /* File is being opened for execution. Primary users of this flag are
75 distributed filesystems that can use it to achieve correct ETXTBUSY
76 behavior for cross-node execution/opening_for_writing of files */
83 #define READA 2 /* read-ahead - don't block if no resources */
84 #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
85 #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
86 #define READ_META (READ | (1 << BIO_RW_META))
87 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
88 #define SWRITE_SYNC (SWRITE | (1 << BIO_RW_SYNC))
89 #define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER))
90 #define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD)
91 #define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER))
97 /* public flags for file_system_type */
98 #define FS_REQUIRES_DEV 1
99 #define FS_BINARY_MOUNTDATA 2
100 #define FS_HAS_SUBTYPE 4
101 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
102 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
103 * during rename() internally.
107 * These are the fs-independent mount-flags: up to 32 flags are supported
109 #define MS_RDONLY 1 /* Mount read-only */
110 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
111 #define MS_NODEV 4 /* Disallow access to device special files */
112 #define MS_NOEXEC 8 /* Disallow program execution */
113 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
114 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
115 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
116 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
117 #define MS_NOATIME 1024 /* Do not update access times. */
118 #define MS_NODIRATIME 2048 /* Do not update directory access times */
122 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
123 MS_VERBOSE is deprecated. */
124 #define MS_SILENT 32768
125 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
126 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
127 #define MS_PRIVATE (1<<18) /* change to private */
128 #define MS_SLAVE (1<<19) /* change to slave */
129 #define MS_SHARED (1<<20) /* change to shared */
130 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
131 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
132 #define MS_I_VERSION (1<<23) /* Update inode I_version field */
133 #define MS_ACTIVE (1<<30)
134 #define MS_NOUSER (1<<31)
137 * Superblock flags that can be altered by MS_REMOUNT
139 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
142 * Old magic mount flag and mask
144 #define MS_MGC_VAL 0xC0ED0000
145 #define MS_MGC_MSK 0xffff0000
147 /* Inode flags - they have nothing to superblock flags now */
149 #define S_SYNC 1 /* Writes are synced at once */
150 #define S_NOATIME 2 /* Do not update access times */
151 #define S_APPEND 4 /* Append-only file */
152 #define S_IMMUTABLE 8 /* Immutable file */
153 #define S_DEAD 16 /* removed, but still open directory */
154 #define S_NOQUOTA 32 /* Inode is not counted to quota */
155 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
156 #define S_NOCMTIME 128 /* Do not update file c/mtime */
157 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
158 #define S_PRIVATE 512 /* Inode is fs-internal */
161 * Note that nosuid etc flags are inode-specific: setting some file-system
162 * flags just means all the inodes inherit those flags by default. It might be
163 * possible to override it selectively if you really wanted to with some
164 * ioctl() that is not currently implemented.
166 * Exception: MS_RDONLY is always applied to the entire file system.
168 * Unfortunately, it is possible to change a filesystems flags with it mounted
169 * with files in use. This means that all of the inodes will not have their
170 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
171 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
173 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
175 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
176 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
177 ((inode)->i_flags & S_SYNC))
178 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
179 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
180 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
181 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
182 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
184 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
185 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
186 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
187 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
189 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
190 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
191 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
192 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
194 /* the read-only stuff doesn't really belong here, but any other place is
195 probably as bad and I don't want to create yet another include file. */
197 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
198 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
199 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
200 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
201 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
202 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
203 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
204 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
205 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
206 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
207 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
208 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
210 #define BLKPG _IO(0x12,105)/* See blkpg.h */
212 /* Some people are morons. Do not use sizeof! */
214 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
215 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
216 /* This was here just to show that the number is taken -
217 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
219 /* A jump here: 108-111 have been used for various private purposes. */
220 #define BLKBSZGET _IOR(0x12,112,size_t)
221 #define BLKBSZSET _IOW(0x12,113,size_t)
222 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
223 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
224 #define BLKTRACESTART _IO(0x12,116)
225 #define BLKTRACESTOP _IO(0x12,117)
226 #define BLKTRACETEARDOWN _IO(0x12,118)
227 #define BLKDISCARD _IO(0x12,119)
229 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
230 #define FIBMAP _IO(0x00,1) /* bmap access */
231 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
233 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
234 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
235 #define FS_IOC_GETVERSION _IOR('v', 1, long)
236 #define FS_IOC_SETVERSION _IOW('v', 2, long)
237 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
238 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
239 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
240 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
241 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
244 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
246 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
247 #define FS_UNRM_FL 0x00000002 /* Undelete */
248 #define FS_COMPR_FL 0x00000004 /* Compress file */
249 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
250 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
251 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
252 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
253 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
254 /* Reserved for compression usage... */
255 #define FS_DIRTY_FL 0x00000100
256 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
257 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
258 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
259 /* End compression flags --- maybe not all used */
260 #define FS_BTREE_FL 0x00001000 /* btree format dir */
261 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
262 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
263 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
264 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
265 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
266 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
267 #define FS_EXTENT_FL 0x00080000 /* Extents */
268 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
269 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
271 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
272 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
275 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
276 #define SYNC_FILE_RANGE_WRITE 2
277 #define SYNC_FILE_RANGE_WAIT_AFTER 4
281 #include <linux/linkage.h>
282 #include <linux/wait.h>
283 #include <linux/types.h>
284 #include <linux/kdev_t.h>
285 #include <linux/dcache.h>
286 #include <linux/path.h>
287 #include <linux/stat.h>
288 #include <linux/cache.h>
289 #include <linux/kobject.h>
290 #include <linux/list.h>
291 #include <linux/radix-tree.h>
292 #include <linux/prio_tree.h>
293 #include <linux/init.h>
294 #include <linux/pid.h>
295 #include <linux/mutex.h>
296 #include <linux/capability.h>
297 #include <linux/semaphore.h>
298 #include <linux/fiemap.h>
300 #include <asm/atomic.h>
301 #include <asm/byteorder.h>
303 struct export_operations
;
308 struct pipe_inode_info
;
309 struct poll_table_struct
;
311 struct vm_area_struct
;
314 extern void __init
inode_init(void);
315 extern void __init
inode_init_early(void);
316 extern void __init
files_init(unsigned long);
319 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
320 struct buffer_head
*bh_result
, int create
);
321 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
322 ssize_t bytes
, void *private);
325 * Attribute flags. These should be or-ed together to figure out what
328 #define ATTR_MODE (1 << 0)
329 #define ATTR_UID (1 << 1)
330 #define ATTR_GID (1 << 2)
331 #define ATTR_SIZE (1 << 3)
332 #define ATTR_ATIME (1 << 4)
333 #define ATTR_MTIME (1 << 5)
334 #define ATTR_CTIME (1 << 6)
335 #define ATTR_ATIME_SET (1 << 7)
336 #define ATTR_MTIME_SET (1 << 8)
337 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
338 #define ATTR_ATTR_FLAG (1 << 10)
339 #define ATTR_KILL_SUID (1 << 11)
340 #define ATTR_KILL_SGID (1 << 12)
341 #define ATTR_FILE (1 << 13)
342 #define ATTR_KILL_PRIV (1 << 14)
343 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
344 #define ATTR_TIMES_SET (1 << 16)
347 * This is the Inode Attributes structure, used for notify_change(). It
348 * uses the above definitions as flags, to know which values have changed.
349 * Also, in this manner, a Filesystem can look at only the values it cares
350 * about. Basically, these are the attributes that the VFS layer can
351 * request to change from the FS layer.
353 * Derek Atkins <warlord@MIT.EDU> 94-10-20
356 unsigned int ia_valid
;
361 struct timespec ia_atime
;
362 struct timespec ia_mtime
;
363 struct timespec ia_ctime
;
366 * Not an attribute, but an auxilary info for filesystems wanting to
367 * implement an ftruncate() like method. NOTE: filesystem should
368 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
370 struct file
*ia_file
;
374 * Includes for diskquotas.
376 #include <linux/quota.h>
379 * enum positive_aop_returns - aop return codes with specific semantics
381 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
382 * completed, that the page is still locked, and
383 * should be considered active. The VM uses this hint
384 * to return the page to the active list -- it won't
385 * be a candidate for writeback again in the near
386 * future. Other callers must be careful to unlock
387 * the page if they get this return. Returned by
390 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
391 * unlocked it and the page might have been truncated.
392 * The caller should back up to acquiring a new page and
393 * trying again. The aop will be taking reasonable
394 * precautions not to livelock. If the caller held a page
395 * reference, it should drop it before retrying. Returned
398 * address_space_operation functions return these large constants to indicate
399 * special semantics to the caller. These are much larger than the bytes in a
400 * page to allow for functions that return the number of bytes operated on in a
404 enum positive_aop_returns
{
405 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
406 AOP_TRUNCATED_PAGE
= 0x80001,
409 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
410 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
413 * oh the beauties of C type declarations.
416 struct address_space
;
417 struct writeback_control
;
420 const struct iovec
*iov
;
421 unsigned long nr_segs
;
426 size_t iov_iter_copy_from_user_atomic(struct page
*page
,
427 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
428 size_t iov_iter_copy_from_user(struct page
*page
,
429 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
430 void iov_iter_advance(struct iov_iter
*i
, size_t bytes
);
431 int iov_iter_fault_in_readable(struct iov_iter
*i
, size_t bytes
);
432 size_t iov_iter_single_seg_count(struct iov_iter
*i
);
434 static inline void iov_iter_init(struct iov_iter
*i
,
435 const struct iovec
*iov
, unsigned long nr_segs
,
436 size_t count
, size_t written
)
439 i
->nr_segs
= nr_segs
;
441 i
->count
= count
+ written
;
443 iov_iter_advance(i
, written
);
446 static inline size_t iov_iter_count(struct iov_iter
*i
)
452 * "descriptor" for what we're up to with a read.
453 * This allows us to use the same read code yet
454 * have multiple different users of the data that
455 * we read from a file.
457 * The simplest case just copies the data to user
470 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
471 unsigned long, unsigned long);
473 struct address_space_operations
{
474 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
475 int (*readpage
)(struct file
*, struct page
*);
476 void (*sync_page
)(struct page
*);
478 /* Write back some dirty pages from this mapping. */
479 int (*writepages
)(struct address_space
*, struct writeback_control
*);
481 /* Set a page dirty. Return true if this dirtied it */
482 int (*set_page_dirty
)(struct page
*page
);
484 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
485 struct list_head
*pages
, unsigned nr_pages
);
488 * ext3 requires that a successful prepare_write() call be followed
489 * by a commit_write() call - they must be balanced
491 int (*prepare_write
)(struct file
*, struct page
*, unsigned, unsigned);
492 int (*commit_write
)(struct file
*, struct page
*, unsigned, unsigned);
494 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
495 loff_t pos
, unsigned len
, unsigned flags
,
496 struct page
**pagep
, void **fsdata
);
497 int (*write_end
)(struct file
*, struct address_space
*mapping
,
498 loff_t pos
, unsigned len
, unsigned copied
,
499 struct page
*page
, void *fsdata
);
501 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
502 sector_t (*bmap
)(struct address_space
*, sector_t
);
503 void (*invalidatepage
) (struct page
*, unsigned long);
504 int (*releasepage
) (struct page
*, gfp_t
);
505 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
506 loff_t offset
, unsigned long nr_segs
);
507 int (*get_xip_mem
)(struct address_space
*, pgoff_t
, int,
508 void **, unsigned long *);
509 /* migrate the contents of a page to the specified target */
510 int (*migratepage
) (struct address_space
*,
511 struct page
*, struct page
*);
512 int (*launder_page
) (struct page
*);
513 int (*is_partially_uptodate
) (struct page
*, read_descriptor_t
*,
518 * pagecache_write_begin/pagecache_write_end must be used by general code
519 * to write into the pagecache.
521 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
522 loff_t pos
, unsigned len
, unsigned flags
,
523 struct page
**pagep
, void **fsdata
);
525 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
526 loff_t pos
, unsigned len
, unsigned copied
,
527 struct page
*page
, void *fsdata
);
529 struct backing_dev_info
;
530 struct address_space
{
531 struct inode
*host
; /* owner: inode, block_device */
532 struct radix_tree_root page_tree
; /* radix tree of all pages */
533 spinlock_t tree_lock
; /* and lock protecting it */
534 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
535 struct prio_tree_root i_mmap
; /* tree of private and shared mappings */
536 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
537 spinlock_t i_mmap_lock
; /* protect tree, count, list */
538 unsigned int truncate_count
; /* Cover race condition with truncate */
539 unsigned long nrpages
; /* number of total pages */
540 pgoff_t writeback_index
;/* writeback starts here */
541 const struct address_space_operations
*a_ops
; /* methods */
542 unsigned long flags
; /* error bits/gfp mask */
543 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
544 spinlock_t private_lock
; /* for use by the address_space */
545 struct list_head private_list
; /* ditto */
546 struct address_space
*assoc_mapping
; /* ditto */
547 } __attribute__((aligned(sizeof(long))));
549 * On most architectures that alignment is already the case; but
550 * must be enforced here for CRIS, to let the least signficant bit
551 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
554 struct block_device
{
555 dev_t bd_dev
; /* not a kdev_t - it's a search key */
556 struct inode
* bd_inode
; /* will die */
558 struct mutex bd_mutex
; /* open/close mutex */
559 struct semaphore bd_mount_sem
;
560 struct list_head bd_inodes
;
564 struct list_head bd_holder_list
;
566 struct block_device
* bd_contains
;
567 unsigned bd_block_size
;
568 struct hd_struct
* bd_part
;
569 /* number of times partitions within this device have been opened. */
570 unsigned bd_part_count
;
572 struct gendisk
* bd_disk
;
573 struct list_head bd_list
;
574 struct backing_dev_info
*bd_inode_backing_dev_info
;
576 * Private data. You must have bd_claim'ed the block_device
577 * to use this. NOTE: bd_claim allows an owner to claim
578 * the same device multiple times, the owner must take special
579 * care to not mess up bd_private for that case.
581 unsigned long bd_private
;
585 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
588 #define PAGECACHE_TAG_DIRTY 0
589 #define PAGECACHE_TAG_WRITEBACK 1
591 int mapping_tagged(struct address_space
*mapping
, int tag
);
594 * Might pages of this file be mapped into userspace?
596 static inline int mapping_mapped(struct address_space
*mapping
)
598 return !prio_tree_empty(&mapping
->i_mmap
) ||
599 !list_empty(&mapping
->i_mmap_nonlinear
);
603 * Might pages of this file have been modified in userspace?
604 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
605 * marks vma as VM_SHARED if it is shared, and the file was opened for
606 * writing i.e. vma may be mprotected writable even if now readonly.
608 static inline int mapping_writably_mapped(struct address_space
*mapping
)
610 return mapping
->i_mmap_writable
!= 0;
614 * Use sequence counter to get consistent i_size on 32-bit processors.
616 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
617 #include <linux/seqlock.h>
618 #define __NEED_I_SIZE_ORDERED
619 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
621 #define i_size_ordered_init(inode) do { } while (0)
625 struct hlist_node i_hash
;
626 struct list_head i_list
;
627 struct list_head i_sb_list
;
628 struct list_head i_dentry
;
631 unsigned int i_nlink
;
637 #ifdef __NEED_I_SIZE_ORDERED
638 seqcount_t i_size_seqcount
;
640 struct timespec i_atime
;
641 struct timespec i_mtime
;
642 struct timespec i_ctime
;
643 unsigned int i_blkbits
;
645 unsigned short i_bytes
;
647 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
648 struct mutex i_mutex
;
649 struct rw_semaphore i_alloc_sem
;
650 const struct inode_operations
*i_op
;
651 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
652 struct super_block
*i_sb
;
653 struct file_lock
*i_flock
;
654 struct address_space
*i_mapping
;
655 struct address_space i_data
;
657 struct dquot
*i_dquot
[MAXQUOTAS
];
659 struct list_head i_devices
;
661 struct pipe_inode_info
*i_pipe
;
662 struct block_device
*i_bdev
;
669 #ifdef CONFIG_DNOTIFY
670 unsigned long i_dnotify_mask
; /* Directory notify events */
671 struct dnotify_struct
*i_dnotify
; /* for directory notifications */
674 #ifdef CONFIG_INOTIFY
675 struct list_head inotify_watches
; /* watches on this inode */
676 struct mutex inotify_mutex
; /* protects the watches list */
679 unsigned long i_state
;
680 unsigned long dirtied_when
; /* jiffies of first dirtying */
682 unsigned int i_flags
;
684 atomic_t i_writecount
;
685 #ifdef CONFIG_SECURITY
688 void *i_private
; /* fs or device private pointer */
692 * inode->i_mutex nesting subclasses for the lock validator:
694 * 0: the object of the current VFS operation
699 * The locking order between these classes is
700 * parent -> child -> normal -> xattr -> quota
702 enum inode_i_mutex_lock_class
711 extern void inode_double_lock(struct inode
*inode1
, struct inode
*inode2
);
712 extern void inode_double_unlock(struct inode
*inode1
, struct inode
*inode2
);
715 * NOTE: in a 32bit arch with a preemptable kernel and
716 * an UP compile the i_size_read/write must be atomic
717 * with respect to the local cpu (unlike with preempt disabled),
718 * but they don't need to be atomic with respect to other cpus like in
719 * true SMP (so they need either to either locally disable irq around
720 * the read or for example on x86 they can be still implemented as a
721 * cmpxchg8b without the need of the lock prefix). For SMP compiles
722 * and 64bit archs it makes no difference if preempt is enabled or not.
724 static inline loff_t
i_size_read(const struct inode
*inode
)
726 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
731 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
732 i_size
= inode
->i_size
;
733 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
735 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
739 i_size
= inode
->i_size
;
743 return inode
->i_size
;
748 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
749 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
750 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
752 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
754 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
755 write_seqcount_begin(&inode
->i_size_seqcount
);
756 inode
->i_size
= i_size
;
757 write_seqcount_end(&inode
->i_size_seqcount
);
758 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
760 inode
->i_size
= i_size
;
763 inode
->i_size
= i_size
;
767 static inline unsigned iminor(const struct inode
*inode
)
769 return MINOR(inode
->i_rdev
);
772 static inline unsigned imajor(const struct inode
*inode
)
774 return MAJOR(inode
->i_rdev
);
777 extern struct block_device
*I_BDEV(struct inode
*inode
);
780 rwlock_t lock
; /* protects pid, uid, euid fields */
781 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
782 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
783 uid_t uid
, euid
; /* uid/euid of process setting the owner */
784 int signum
; /* posix.1b rt signal to be delivered on IO */
788 * Track a single file's readahead state
790 struct file_ra_state
{
791 pgoff_t start
; /* where readahead started */
792 unsigned int size
; /* # of readahead pages */
793 unsigned int async_size
; /* do asynchronous readahead when
794 there are only # of pages ahead */
796 unsigned int ra_pages
; /* Maximum readahead window */
797 int mmap_miss
; /* Cache miss stat for mmap accesses */
798 loff_t prev_pos
; /* Cache last read() position */
802 * Check if @index falls in the readahead windows.
804 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
806 return (index
>= ra
->start
&&
807 index
< ra
->start
+ ra
->size
);
810 #define FILE_MNT_WRITE_TAKEN 1
811 #define FILE_MNT_WRITE_RELEASED 2
815 * fu_list becomes invalid after file_free is called and queued via
816 * fu_rcuhead for RCU freeing
819 struct list_head fu_list
;
820 struct rcu_head fu_rcuhead
;
823 #define f_dentry f_path.dentry
824 #define f_vfsmnt f_path.mnt
825 const struct file_operations
*f_op
;
826 atomic_long_t f_count
;
827 unsigned int f_flags
;
830 struct fown_struct f_owner
;
831 unsigned int f_uid
, f_gid
;
832 struct file_ra_state f_ra
;
835 #ifdef CONFIG_SECURITY
838 /* needed for tty driver, and maybe others */
842 /* Used by fs/eventpoll.c to link all the hooks to this file */
843 struct list_head f_ep_links
;
844 spinlock_t f_ep_lock
;
845 #endif /* #ifdef CONFIG_EPOLL */
846 struct address_space
*f_mapping
;
847 #ifdef CONFIG_DEBUG_WRITECOUNT
848 unsigned long f_mnt_write_state
;
851 extern spinlock_t files_lock
;
852 #define file_list_lock() spin_lock(&files_lock);
853 #define file_list_unlock() spin_unlock(&files_lock);
855 #define get_file(x) atomic_long_inc(&(x)->f_count)
856 #define file_count(x) atomic_long_read(&(x)->f_count)
858 #ifdef CONFIG_DEBUG_WRITECOUNT
859 static inline void file_take_write(struct file
*f
)
861 WARN_ON(f
->f_mnt_write_state
!= 0);
862 f
->f_mnt_write_state
= FILE_MNT_WRITE_TAKEN
;
864 static inline void file_release_write(struct file
*f
)
866 f
->f_mnt_write_state
|= FILE_MNT_WRITE_RELEASED
;
868 static inline void file_reset_write(struct file
*f
)
870 f
->f_mnt_write_state
= 0;
872 static inline void file_check_state(struct file
*f
)
875 * At this point, either both or neither of these bits
878 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
);
879 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_RELEASED
);
881 static inline int file_check_writeable(struct file
*f
)
883 if (f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
)
885 printk(KERN_WARNING
"writeable file with no "
886 "mnt_want_write()\n");
890 #else /* !CONFIG_DEBUG_WRITECOUNT */
891 static inline void file_take_write(struct file
*filp
) {}
892 static inline void file_release_write(struct file
*filp
) {}
893 static inline void file_reset_write(struct file
*filp
) {}
894 static inline void file_check_state(struct file
*filp
) {}
895 static inline int file_check_writeable(struct file
*filp
)
899 #endif /* CONFIG_DEBUG_WRITECOUNT */
901 #define MAX_NON_LFS ((1UL<<31) - 1)
903 /* Page cache limit. The filesystems should put that into their s_maxbytes
904 limits, otherwise bad things can happen in VM. */
905 #if BITS_PER_LONG==32
906 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
907 #elif BITS_PER_LONG==64
908 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
913 #define FL_ACCESS 8 /* not trying to lock, just looking */
914 #define FL_EXISTS 16 /* when unlocking, test for existence */
915 #define FL_LEASE 32 /* lease held on this file */
916 #define FL_CLOSE 64 /* unlock on close */
917 #define FL_SLEEP 128 /* A blocking lock */
920 * Special return value from posix_lock_file() and vfs_lock_file() for
921 * asynchronous locking.
923 #define FILE_LOCK_DEFERRED 1
926 * The POSIX file lock owner is determined by
927 * the "struct files_struct" in the thread group
928 * (or NULL for no owner - BSD locks).
930 * Lockd stuffs a "host" pointer into this.
932 typedef struct files_struct
*fl_owner_t
;
934 struct file_lock_operations
{
935 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
936 void (*fl_release_private
)(struct file_lock
*);
939 struct lock_manager_operations
{
940 int (*fl_compare_owner
)(struct file_lock
*, struct file_lock
*);
941 void (*fl_notify
)(struct file_lock
*); /* unblock callback */
942 int (*fl_grant
)(struct file_lock
*, struct file_lock
*, int);
943 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
944 void (*fl_release_private
)(struct file_lock
*);
945 void (*fl_break
)(struct file_lock
*);
946 int (*fl_mylease
)(struct file_lock
*, struct file_lock
*);
947 int (*fl_change
)(struct file_lock
**, int);
950 struct lock_manager
{
951 struct list_head list
;
954 void locks_start_grace(struct lock_manager
*);
955 void locks_end_grace(struct lock_manager
*);
956 int locks_in_grace(void);
958 /* that will die - we need it for nfs_lock_info */
959 #include <linux/nfs_fs_i.h>
962 struct file_lock
*fl_next
; /* singly linked list for this inode */
963 struct list_head fl_link
; /* doubly linked list of all locks */
964 struct list_head fl_block
; /* circular list of blocked processes */
966 unsigned char fl_flags
;
967 unsigned char fl_type
;
969 struct pid
*fl_nspid
;
970 wait_queue_head_t fl_wait
;
971 struct file
*fl_file
;
975 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
976 unsigned long fl_break_time
; /* for nonblocking lease breaks */
978 struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
979 struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
981 struct nfs_lock_info nfs_fl
;
982 struct nfs4_lock_info nfs4_fl
;
984 struct list_head link
; /* link in AFS vnode's pending_locks list */
985 int state
; /* state of grant or error if -ve */
990 /* The following constant reflects the upper bound of the file/locking space */
992 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
993 #define OFFSET_MAX INT_LIMIT(loff_t)
994 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
997 #include <linux/fcntl.h>
999 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
1002 extern int do_sync_mapping_range(struct address_space
*mapping
, loff_t offset
,
1003 loff_t endbyte
, unsigned int flags
);
1005 #ifdef CONFIG_FILE_LOCKING
1006 extern int fcntl_getlk(struct file
*, struct flock __user
*);
1007 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
1008 struct flock __user
*);
1010 #if BITS_PER_LONG == 32
1011 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
1012 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
1013 struct flock64 __user
*);
1016 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
1017 extern int fcntl_getlease(struct file
*filp
);
1020 extern void locks_init_lock(struct file_lock
*);
1021 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
1022 extern void __locks_copy_lock(struct file_lock
*, const struct file_lock
*);
1023 extern void locks_remove_posix(struct file
*, fl_owner_t
);
1024 extern void locks_remove_flock(struct file
*);
1025 extern void posix_test_lock(struct file
*, struct file_lock
*);
1026 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
1027 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
1028 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
1029 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1030 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1031 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1032 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
1033 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
1034 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
1035 extern int generic_setlease(struct file
*, long, struct file_lock
**);
1036 extern int vfs_setlease(struct file
*, long, struct file_lock
**);
1037 extern int lease_modify(struct file_lock
**, int);
1038 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
1039 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
1040 extern struct seq_operations locks_seq_operations
;
1041 #else /* !CONFIG_FILE_LOCKING */
1042 #define fcntl_getlk(a, b) ({ -EINVAL; })
1043 #define fcntl_setlk(a, b, c, d) ({ -EACCES; })
1044 #if BITS_PER_LONG == 32
1045 #define fcntl_getlk64(a, b) ({ -EINVAL; })
1046 #define fcntl_setlk64(a, b, c, d) ({ -EACCES; })
1048 #define fcntl_setlease(a, b, c) ({ 0; })
1049 #define fcntl_getlease(a) ({ 0; })
1050 #define locks_init_lock(a) ({ })
1051 #define __locks_copy_lock(a, b) ({ })
1052 #define locks_copy_lock(a, b) ({ })
1053 #define locks_remove_posix(a, b) ({ })
1054 #define locks_remove_flock(a) ({ })
1055 #define posix_test_lock(a, b) ({ 0; })
1056 #define posix_lock_file(a, b, c) ({ -ENOLCK; })
1057 #define posix_lock_file_wait(a, b) ({ -ENOLCK; })
1058 #define posix_unblock_lock(a, b) (-ENOENT)
1059 #define vfs_test_lock(a, b) ({ 0; })
1060 #define vfs_lock_file(a, b, c, d) (-ENOLCK)
1061 #define vfs_cancel_lock(a, b) ({ 0; })
1062 #define flock_lock_file_wait(a, b) ({ -ENOLCK; })
1063 #define __break_lease(a, b) ({ 0; })
1064 #define lease_get_mtime(a, b) ({ })
1065 #define generic_setlease(a, b, c) ({ -EINVAL; })
1066 #define vfs_setlease(a, b, c) ({ -EINVAL; })
1067 #define lease_modify(a, b) ({ -EINVAL; })
1068 #define lock_may_read(a, b, c) ({ 1; })
1069 #define lock_may_write(a, b, c) ({ 1; })
1070 #endif /* !CONFIG_FILE_LOCKING */
1073 struct fasync_struct
{
1076 struct fasync_struct
*fa_next
; /* singly linked list */
1077 struct file
*fa_file
;
1080 #define FASYNC_MAGIC 0x4601
1082 /* SMP safe fasync helpers: */
1083 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1084 /* can be called from interrupts */
1085 extern void kill_fasync(struct fasync_struct
**, int, int);
1086 /* only for net: no internal synchronization */
1087 extern void __kill_fasync(struct fasync_struct
*, int, int);
1089 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1090 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1091 extern void f_delown(struct file
*filp
);
1092 extern pid_t
f_getown(struct file
*filp
);
1093 extern int send_sigurg(struct fown_struct
*fown
);
1099 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1100 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1101 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1103 extern struct list_head super_blocks
;
1104 extern spinlock_t sb_lock
;
1106 #define sb_entry(list) list_entry((list), struct super_block, s_list)
1107 #define S_BIAS (1<<30)
1108 struct super_block
{
1109 struct list_head s_list
; /* Keep this first */
1110 dev_t s_dev
; /* search index; _not_ kdev_t */
1111 unsigned long s_blocksize
;
1112 unsigned char s_blocksize_bits
;
1113 unsigned char s_dirt
;
1114 unsigned long long s_maxbytes
; /* Max file size */
1115 struct file_system_type
*s_type
;
1116 const struct super_operations
*s_op
;
1117 struct dquot_operations
*dq_op
;
1118 struct quotactl_ops
*s_qcop
;
1119 const struct export_operations
*s_export_op
;
1120 unsigned long s_flags
;
1121 unsigned long s_magic
;
1122 struct dentry
*s_root
;
1123 struct rw_semaphore s_umount
;
1124 struct mutex s_lock
;
1129 #ifdef CONFIG_SECURITY
1132 struct xattr_handler
**s_xattr
;
1134 struct list_head s_inodes
; /* all inodes */
1135 struct list_head s_dirty
; /* dirty inodes */
1136 struct list_head s_io
; /* parked for writeback */
1137 struct list_head s_more_io
; /* parked for more writeback */
1138 struct hlist_head s_anon
; /* anonymous dentries for (nfs) exporting */
1139 struct list_head s_files
;
1140 /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
1141 struct list_head s_dentry_lru
; /* unused dentry lru */
1142 int s_nr_dentry_unused
; /* # of dentry on lru */
1144 struct block_device
*s_bdev
;
1145 struct mtd_info
*s_mtd
;
1146 struct list_head s_instances
;
1147 struct quota_info s_dquot
; /* Diskquota specific options */
1150 wait_queue_head_t s_wait_unfrozen
;
1152 char s_id
[32]; /* Informational name */
1154 void *s_fs_info
; /* Filesystem private info */
1157 * The next field is for VFS *only*. No filesystems have any business
1158 * even looking at it. You had been warned.
1160 struct mutex s_vfs_rename_mutex
; /* Kludge */
1162 /* Granularity of c/m/atime in ns.
1163 Cannot be worse than a second */
1167 * Filesystem subtype. If non-empty the filesystem type field
1168 * in /proc/mounts will be "type.subtype"
1173 * Saved mount options for lazy filesystems using
1174 * generic_show_options()
1179 extern struct timespec
current_fs_time(struct super_block
*sb
);
1182 * Snapshotting support.
1186 SB_FREEZE_WRITE
= 1,
1187 SB_FREEZE_TRANS
= 2,
1190 #define vfs_check_frozen(sb, level) \
1191 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1193 #define get_fs_excl() atomic_inc(¤t->fs_excl)
1194 #define put_fs_excl() atomic_dec(¤t->fs_excl)
1195 #define has_fs_excl() atomic_read(¤t->fs_excl)
1197 #define is_owner_or_cap(inode) \
1198 ((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER))
1200 /* not quite ready to be deprecated, but... */
1201 extern void lock_super(struct super_block
*);
1202 extern void unlock_super(struct super_block
*);
1205 * VFS helper functions..
1207 extern int vfs_permission(struct nameidata
*, int);
1208 extern int vfs_create(struct inode
*, struct dentry
*, int, struct nameidata
*);
1209 extern int vfs_mkdir(struct inode
*, struct dentry
*, int);
1210 extern int vfs_mknod(struct inode
*, struct dentry
*, int, dev_t
);
1211 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1212 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
1213 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1214 extern int vfs_unlink(struct inode
*, struct dentry
*);
1215 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1218 * VFS dentry helper functions.
1220 extern void dentry_unhash(struct dentry
*dentry
);
1223 * VFS file helper functions.
1225 extern int file_permission(struct file
*, int);
1228 * VFS FS_IOC_FIEMAP helper definitions.
1230 struct fiemap_extent_info
{
1231 unsigned int fi_flags
; /* Flags as passed from user */
1232 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1233 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1234 struct fiemap_extent
*fi_extents_start
; /* Start of fiemap_extent
1237 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1238 u64 phys
, u64 len
, u32 flags
);
1239 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1244 * NOTE! These match bits 12..15 of stat.st_mode
1245 * (ie "(i_mode >> 12) & 15").
1247 #define DT_UNKNOWN 0
1257 #define OSYNC_METADATA (1<<0)
1258 #define OSYNC_DATA (1<<1)
1259 #define OSYNC_INODE (1<<2)
1260 int generic_osync_inode(struct inode
*, struct address_space
*, int);
1263 * This is the "filldir" function type, used by readdir() to let
1264 * the kernel specify what kind of dirent layout it wants to have.
1265 * This allows the kernel to read directories into kernel space or
1266 * to have different dirent layouts depending on the binary type.
1268 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1270 struct block_device_operations
{
1271 int (*open
) (struct inode
*, struct file
*);
1272 int (*release
) (struct inode
*, struct file
*);
1273 int (*ioctl
) (struct inode
*, struct file
*, unsigned, unsigned long);
1274 long (*unlocked_ioctl
) (struct file
*, unsigned, unsigned long);
1275 long (*compat_ioctl
) (struct file
*, unsigned, unsigned long);
1276 int (*direct_access
) (struct block_device
*, sector_t
,
1277 void **, unsigned long *);
1278 int (*media_changed
) (struct gendisk
*);
1279 int (*revalidate_disk
) (struct gendisk
*);
1280 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1281 struct module
*owner
;
1284 /* These macros are for out of kernel modules to test that
1285 * the kernel supports the unlocked_ioctl and compat_ioctl
1286 * fields in struct file_operations. */
1287 #define HAVE_COMPAT_IOCTL 1
1288 #define HAVE_UNLOCKED_IOCTL 1
1292 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1293 * can be called without the big kernel lock held in all filesystems.
1295 struct file_operations
{
1296 struct module
*owner
;
1297 loff_t (*llseek
) (struct file
*, loff_t
, int);
1298 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1299 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1300 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1301 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1302 int (*readdir
) (struct file
*, void *, filldir_t
);
1303 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1304 int (*ioctl
) (struct inode
*, struct file
*, unsigned int, unsigned long);
1305 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1306 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1307 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1308 int (*open
) (struct inode
*, struct file
*);
1309 int (*flush
) (struct file
*, fl_owner_t id
);
1310 int (*release
) (struct inode
*, struct file
*);
1311 int (*fsync
) (struct file
*, struct dentry
*, int datasync
);
1312 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1313 int (*fasync
) (int, struct file
*, int);
1314 int (*lock
) (struct file
*, int, struct file_lock
*);
1315 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1316 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1317 int (*check_flags
)(int);
1318 int (*dir_notify
)(struct file
*filp
, unsigned long arg
);
1319 int (*flock
) (struct file
*, int, struct file_lock
*);
1320 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1321 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1322 int (*setlease
)(struct file
*, long, struct file_lock
**);
1325 struct inode_operations
{
1326 int (*create
) (struct inode
*,struct dentry
*,int, struct nameidata
*);
1327 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, struct nameidata
*);
1328 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1329 int (*unlink
) (struct inode
*,struct dentry
*);
1330 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1331 int (*mkdir
) (struct inode
*,struct dentry
*,int);
1332 int (*rmdir
) (struct inode
*,struct dentry
*);
1333 int (*mknod
) (struct inode
*,struct dentry
*,int,dev_t
);
1334 int (*rename
) (struct inode
*, struct dentry
*,
1335 struct inode
*, struct dentry
*);
1336 int (*readlink
) (struct dentry
*, char __user
*,int);
1337 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1338 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1339 void (*truncate
) (struct inode
*);
1340 int (*permission
) (struct inode
*, int);
1341 int (*setattr
) (struct dentry
*, struct iattr
*);
1342 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1343 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1344 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1345 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1346 int (*removexattr
) (struct dentry
*, const char *);
1347 void (*truncate_range
)(struct inode
*, loff_t
, loff_t
);
1348 long (*fallocate
)(struct inode
*inode
, int mode
, loff_t offset
,
1350 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1356 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1357 unsigned long nr_segs
, unsigned long fast_segs
,
1358 struct iovec
*fast_pointer
,
1359 struct iovec
**ret_pointer
);
1361 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1362 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1363 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1364 unsigned long, loff_t
*);
1365 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1366 unsigned long, loff_t
*);
1368 struct super_operations
{
1369 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1370 void (*destroy_inode
)(struct inode
*);
1372 void (*dirty_inode
) (struct inode
*);
1373 int (*write_inode
) (struct inode
*, int);
1374 void (*drop_inode
) (struct inode
*);
1375 void (*delete_inode
) (struct inode
*);
1376 void (*put_super
) (struct super_block
*);
1377 void (*write_super
) (struct super_block
*);
1378 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1379 void (*write_super_lockfs
) (struct super_block
*);
1380 void (*unlockfs
) (struct super_block
*);
1381 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1382 int (*remount_fs
) (struct super_block
*, int *, char *);
1383 void (*clear_inode
) (struct inode
*);
1384 void (*umount_begin
) (struct super_block
*);
1386 int (*show_options
)(struct seq_file
*, struct vfsmount
*);
1387 int (*show_stats
)(struct seq_file
*, struct vfsmount
*);
1389 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1390 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1395 * Inode state bits. Protected by inode_lock.
1397 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1398 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1400 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1401 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1402 * various stages of removing an inode.
1404 * Two bits are used for locking and completion notification, I_LOCK and I_SYNC.
1406 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1407 * fdatasync(). i_atime is the usual cause.
1408 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1409 * these changes separately from I_DIRTY_SYNC so that we
1410 * don't have to write inode on fdatasync() when only
1411 * mtime has changed in it.
1412 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1413 * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both
1414 * are cleared by unlock_new_inode(), called from iget().
1415 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1416 * is zero. I_FREEING must be set when I_WILL_FREE is
1418 * I_FREEING Set when inode is about to be freed but still has dirty
1419 * pages or buffers attached or the inode itself is still
1421 * I_CLEAR Set by clear_inode(). In this state the inode is clean
1422 * and can be destroyed.
1424 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1425 * prohibited for many purposes. iget() must wait for
1426 * the inode to be completely released, then create it
1427 * anew. Other functions will just ignore such inodes,
1428 * if appropriate. I_LOCK is used for waiting.
1430 * I_LOCK Serves as both a mutex and completion notification.
1431 * New inodes set I_LOCK. If two processes both create
1432 * the same inode, one of them will release its inode and
1433 * wait for I_LOCK to be released before returning.
1434 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1435 * also cause waiting on I_LOCK, without I_LOCK actually
1436 * being set. find_inode() uses this to prevent returning
1437 * nearly-dead inodes.
1438 * I_SYNC Similar to I_LOCK, but limited in scope to writeback
1439 * of inode dirty data. Having a separate lock for this
1440 * purpose reduces latency and prevents some filesystem-
1441 * specific deadlocks.
1443 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1444 * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on
1445 * I_CLEAR? If not, why?
1447 #define I_DIRTY_SYNC 1
1448 #define I_DIRTY_DATASYNC 2
1449 #define I_DIRTY_PAGES 4
1451 #define I_WILL_FREE 16
1452 #define I_FREEING 32
1455 #define I_LOCK (1 << __I_LOCK)
1457 #define I_SYNC (1 << __I_SYNC)
1459 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1461 extern void __mark_inode_dirty(struct inode
*, int);
1462 static inline void mark_inode_dirty(struct inode
*inode
)
1464 __mark_inode_dirty(inode
, I_DIRTY
);
1467 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1469 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1473 * inc_nlink - directly increment an inode's link count
1476 * This is a low-level filesystem helper to replace any
1477 * direct filesystem manipulation of i_nlink. Currently,
1478 * it is only here for parity with dec_nlink().
1480 static inline void inc_nlink(struct inode
*inode
)
1485 static inline void inode_inc_link_count(struct inode
*inode
)
1488 mark_inode_dirty(inode
);
1492 * drop_nlink - directly drop an inode's link count
1495 * This is a low-level filesystem helper to replace any
1496 * direct filesystem manipulation of i_nlink. In cases
1497 * where we are attempting to track writes to the
1498 * filesystem, a decrement to zero means an imminent
1499 * write when the file is truncated and actually unlinked
1500 * on the filesystem.
1502 static inline void drop_nlink(struct inode
*inode
)
1508 * clear_nlink - directly zero an inode's link count
1511 * This is a low-level filesystem helper to replace any
1512 * direct filesystem manipulation of i_nlink. See
1513 * drop_nlink() for why we care about i_nlink hitting zero.
1515 static inline void clear_nlink(struct inode
*inode
)
1520 static inline void inode_dec_link_count(struct inode
*inode
)
1523 mark_inode_dirty(inode
);
1527 * inode_inc_iversion - increments i_version
1528 * @inode: inode that need to be updated
1530 * Every time the inode is modified, the i_version field will be incremented.
1531 * The filesystem has to be mounted with i_version flag
1534 static inline void inode_inc_iversion(struct inode
*inode
)
1536 spin_lock(&inode
->i_lock
);
1538 spin_unlock(&inode
->i_lock
);
1541 extern void touch_atime(struct vfsmount
*mnt
, struct dentry
*dentry
);
1542 static inline void file_accessed(struct file
*file
)
1544 if (!(file
->f_flags
& O_NOATIME
))
1545 touch_atime(file
->f_path
.mnt
, file
->f_path
.dentry
);
1548 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1550 struct file_system_type
{
1553 int (*get_sb
) (struct file_system_type
*, int,
1554 const char *, void *, struct vfsmount
*);
1555 void (*kill_sb
) (struct super_block
*);
1556 struct module
*owner
;
1557 struct file_system_type
* next
;
1558 struct list_head fs_supers
;
1560 struct lock_class_key s_lock_key
;
1561 struct lock_class_key s_umount_key
;
1563 struct lock_class_key i_lock_key
;
1564 struct lock_class_key i_mutex_key
;
1565 struct lock_class_key i_mutex_dir_key
;
1566 struct lock_class_key i_alloc_sem_key
;
1569 extern int get_sb_bdev(struct file_system_type
*fs_type
,
1570 int flags
, const char *dev_name
, void *data
,
1571 int (*fill_super
)(struct super_block
*, void *, int),
1572 struct vfsmount
*mnt
);
1573 extern int get_sb_single(struct file_system_type
*fs_type
,
1574 int flags
, void *data
,
1575 int (*fill_super
)(struct super_block
*, void *, int),
1576 struct vfsmount
*mnt
);
1577 extern int get_sb_nodev(struct file_system_type
*fs_type
,
1578 int flags
, void *data
,
1579 int (*fill_super
)(struct super_block
*, void *, int),
1580 struct vfsmount
*mnt
);
1581 void generic_shutdown_super(struct super_block
*sb
);
1582 void kill_block_super(struct super_block
*sb
);
1583 void kill_anon_super(struct super_block
*sb
);
1584 void kill_litter_super(struct super_block
*sb
);
1585 void deactivate_super(struct super_block
*sb
);
1586 int set_anon_super(struct super_block
*s
, void *data
);
1587 struct super_block
*sget(struct file_system_type
*type
,
1588 int (*test
)(struct super_block
*,void *),
1589 int (*set
)(struct super_block
*,void *),
1591 extern int get_sb_pseudo(struct file_system_type
*, char *,
1592 const struct super_operations
*ops
, unsigned long,
1593 struct vfsmount
*mnt
);
1594 extern int simple_set_mnt(struct vfsmount
*mnt
, struct super_block
*sb
);
1595 int __put_super_and_need_restart(struct super_block
*sb
);
1596 void unnamed_dev_init(void);
1598 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1599 #define fops_get(fops) \
1600 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1601 #define fops_put(fops) \
1602 do { if (fops) module_put((fops)->owner); } while(0)
1604 extern int register_filesystem(struct file_system_type
*);
1605 extern int unregister_filesystem(struct file_system_type
*);
1606 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
1607 #define kern_mount(type) kern_mount_data(type, NULL)
1608 extern int may_umount_tree(struct vfsmount
*);
1609 extern int may_umount(struct vfsmount
*);
1610 extern long do_mount(char *, char *, char *, unsigned long, void *);
1611 extern struct vfsmount
*collect_mounts(struct vfsmount
*, struct dentry
*);
1612 extern void drop_collected_mounts(struct vfsmount
*);
1614 extern int vfs_statfs(struct dentry
*, struct kstatfs
*);
1617 extern struct kobject
*fs_kobj
;
1619 extern int rw_verify_area(int, struct file
*, loff_t
*, size_t);
1621 #define FLOCK_VERIFY_READ 1
1622 #define FLOCK_VERIFY_WRITE 2
1624 #ifdef CONFIG_FILE_LOCKING
1625 extern int locks_mandatory_locked(struct inode
*);
1626 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1629 * Candidates for mandatory locking have the setgid bit set
1630 * but no group execute bit - an otherwise meaningless combination.
1633 static inline int __mandatory_lock(struct inode
*ino
)
1635 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
1639 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1640 * otherwise these will be advisory locks
1643 static inline int mandatory_lock(struct inode
*ino
)
1645 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
1648 static inline int locks_verify_locked(struct inode
*inode
)
1650 if (mandatory_lock(inode
))
1651 return locks_mandatory_locked(inode
);
1655 static inline int locks_verify_truncate(struct inode
*inode
,
1659 if (inode
->i_flock
&& mandatory_lock(inode
))
1660 return locks_mandatory_area(
1661 FLOCK_VERIFY_WRITE
, inode
, filp
,
1662 size
< inode
->i_size
? size
: inode
->i_size
,
1663 (size
< inode
->i_size
? inode
->i_size
- size
1664 : size
- inode
->i_size
)
1669 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1672 return __break_lease(inode
, mode
);
1675 #else /* !CONFIG_FILE_LOCKING */
1676 #define locks_mandatory_locked(a) ({ 0; })
1677 #define locks_mandatory_area(a, b, c, d, e) ({ 0; })
1678 #define __mandatory_lock(a) ({ 0; })
1679 #define mandatory_lock(a) ({ 0; })
1680 #define locks_verify_locked(a) ({ 0; })
1681 #define locks_verify_truncate(a, b, c) ({ 0; })
1682 #define break_lease(a, b) ({ 0; })
1683 #endif /* CONFIG_FILE_LOCKING */
1687 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
1689 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
1691 extern struct file
*filp_open(const char *, int, int);
1692 extern struct file
* dentry_open(struct dentry
*, struct vfsmount
*, int);
1693 extern int filp_close(struct file
*, fl_owner_t id
);
1694 extern char * getname(const char __user
*);
1697 extern void __init
vfs_caches_init_early(void);
1698 extern void __init
vfs_caches_init(unsigned long);
1700 extern struct kmem_cache
*names_cachep
;
1702 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
1703 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1704 #ifndef CONFIG_AUDITSYSCALL
1705 #define putname(name) __putname(name)
1707 extern void putname(const char *name
);
1711 extern int register_blkdev(unsigned int, const char *);
1712 extern void unregister_blkdev(unsigned int, const char *);
1713 extern struct block_device
*bdget(dev_t
);
1714 extern void bd_set_size(struct block_device
*, loff_t size
);
1715 extern void bd_forget(struct inode
*inode
);
1716 extern void bdput(struct block_device
*);
1717 extern struct block_device
*open_by_devnum(dev_t
, unsigned);
1719 static inline void bd_forget(struct inode
*inode
) {}
1721 extern const struct file_operations def_blk_fops
;
1722 extern const struct file_operations def_chr_fops
;
1723 extern const struct file_operations bad_sock_fops
;
1724 extern const struct file_operations def_fifo_fops
;
1726 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
1727 extern int blkdev_ioctl(struct inode
*, struct file
*, unsigned, unsigned long);
1728 extern int blkdev_driver_ioctl(struct inode
*inode
, struct file
*file
,
1729 struct gendisk
*disk
, unsigned cmd
,
1731 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
1732 extern int blkdev_get(struct block_device
*, mode_t
, unsigned);
1733 extern int blkdev_put(struct block_device
*);
1734 extern int bd_claim(struct block_device
*, void *);
1735 extern void bd_release(struct block_device
*);
1737 extern int bd_claim_by_disk(struct block_device
*, void *, struct gendisk
*);
1738 extern void bd_release_from_disk(struct block_device
*, struct gendisk
*);
1740 #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1741 #define bd_release_from_disk(bdev, disk) bd_release(bdev)
1746 #define CHRDEV_MAJOR_HASH_SIZE 255
1747 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
1748 extern int register_chrdev_region(dev_t
, unsigned, const char *);
1749 extern int register_chrdev(unsigned int, const char *,
1750 const struct file_operations
*);
1751 extern void unregister_chrdev(unsigned int, const char *);
1752 extern void unregister_chrdev_region(dev_t
, unsigned);
1753 extern void chrdev_show(struct seq_file
*,off_t
);
1755 /* fs/block_dev.c */
1756 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1757 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1760 #define BLKDEV_MAJOR_HASH_SIZE 255
1761 extern const char *__bdevname(dev_t
, char *buffer
);
1762 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
1763 extern struct block_device
*lookup_bdev(const char *);
1764 extern struct block_device
*open_bdev_excl(const char *, int, void *);
1765 extern void close_bdev_excl(struct block_device
*);
1766 extern void blkdev_show(struct seq_file
*,off_t
);
1768 #define BLKDEV_MAJOR_HASH_SIZE 0
1771 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
1773 /* Invalid inode operations -- fs/bad_inode.c */
1774 extern void make_bad_inode(struct inode
*);
1775 extern int is_bad_inode(struct inode
*);
1777 extern const struct file_operations read_pipefifo_fops
;
1778 extern const struct file_operations write_pipefifo_fops
;
1779 extern const struct file_operations rdwr_pipefifo_fops
;
1781 extern int fs_may_remount_ro(struct super_block
*);
1785 * return READ, READA, or WRITE
1787 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1790 * return data direction, READ or WRITE
1792 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1794 extern void check_disk_size_change(struct gendisk
*disk
,
1795 struct block_device
*bdev
);
1796 extern int revalidate_disk(struct gendisk
*);
1797 extern int check_disk_change(struct block_device
*);
1798 extern int __invalidate_device(struct block_device
*);
1799 extern int invalidate_partition(struct gendisk
*, int);
1801 extern int invalidate_inodes(struct super_block
*);
1802 unsigned long __invalidate_mapping_pages(struct address_space
*mapping
,
1803 pgoff_t start
, pgoff_t end
,
1805 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
1806 pgoff_t start
, pgoff_t end
);
1808 static inline unsigned long __deprecated
1809 invalidate_inode_pages(struct address_space
*mapping
)
1811 return invalidate_mapping_pages(mapping
, 0, ~0UL);
1814 static inline void invalidate_remote_inode(struct inode
*inode
)
1816 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
1817 S_ISLNK(inode
->i_mode
))
1818 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
1820 extern int invalidate_inode_pages2(struct address_space
*mapping
);
1821 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
1822 pgoff_t start
, pgoff_t end
);
1823 extern void generic_sync_sb_inodes(struct super_block
*sb
,
1824 struct writeback_control
*wbc
);
1825 extern int write_inode_now(struct inode
*, int);
1826 extern int filemap_fdatawrite(struct address_space
*);
1827 extern int filemap_flush(struct address_space
*);
1828 extern int filemap_fdatawait(struct address_space
*);
1829 extern int filemap_write_and_wait(struct address_space
*mapping
);
1830 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
1831 loff_t lstart
, loff_t lend
);
1832 extern int wait_on_page_writeback_range(struct address_space
*mapping
,
1833 pgoff_t start
, pgoff_t end
);
1834 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
1835 loff_t start
, loff_t end
, int sync_mode
);
1836 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
1837 loff_t start
, loff_t end
);
1839 extern long do_fsync(struct file
*file
, int datasync
);
1840 extern void sync_supers(void);
1841 extern void sync_filesystems(int wait
);
1842 extern void __fsync_super(struct super_block
*sb
);
1843 extern void emergency_sync(void);
1844 extern void emergency_remount(void);
1845 extern int do_remount_sb(struct super_block
*sb
, int flags
,
1846 void *data
, int force
);
1848 extern sector_t
bmap(struct inode
*, sector_t
);
1850 extern int notify_change(struct dentry
*, struct iattr
*);
1851 extern int inode_permission(struct inode
*, int);
1852 extern int generic_permission(struct inode
*, int,
1853 int (*check_acl
)(struct inode
*, int));
1855 extern int get_write_access(struct inode
*);
1856 extern int deny_write_access(struct file
*);
1857 static inline void put_write_access(struct inode
* inode
)
1859 atomic_dec(&inode
->i_writecount
);
1861 static inline void allow_write_access(struct file
*file
)
1864 atomic_inc(&file
->f_path
.dentry
->d_inode
->i_writecount
);
1866 extern int do_pipe(int *);
1867 extern int do_pipe_flags(int *, int);
1868 extern struct file
*create_read_pipe(struct file
*f
, int flags
);
1869 extern struct file
*create_write_pipe(int flags
);
1870 extern void free_write_pipe(struct file
*);
1872 extern struct file
*do_filp_open(int dfd
, const char *pathname
,
1873 int open_flag
, int mode
);
1874 extern int may_open(struct nameidata
*, int, int);
1876 extern int kernel_read(struct file
*, unsigned long, char *, unsigned long);
1877 extern struct file
* open_exec(const char *);
1879 /* fs/dcache.c -- generic fs support functions */
1880 extern int is_subdir(struct dentry
*, struct dentry
*);
1881 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
1883 #include <linux/err.h>
1885 /* needed for stackable file system support */
1886 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
1888 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
1890 extern void inode_init_once(struct inode
*);
1891 extern void iput(struct inode
*);
1892 extern struct inode
* igrab(struct inode
*);
1893 extern ino_t
iunique(struct super_block
*, ino_t
);
1894 extern int inode_needs_sync(struct inode
*inode
);
1895 extern void generic_delete_inode(struct inode
*inode
);
1896 extern void generic_drop_inode(struct inode
*inode
);
1898 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
1899 unsigned long hashval
, int (*test
)(struct inode
*, void *),
1901 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
1902 int (*test
)(struct inode
*, void *), void *data
);
1903 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
1905 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
1906 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
1907 extern void unlock_new_inode(struct inode
*);
1909 extern void __iget(struct inode
* inode
);
1910 extern void iget_failed(struct inode
*);
1911 extern void clear_inode(struct inode
*);
1912 extern void destroy_inode(struct inode
*);
1913 extern struct inode
*new_inode(struct super_block
*);
1914 extern int should_remove_suid(struct dentry
*);
1915 extern int file_remove_suid(struct file
*);
1917 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
1918 extern void remove_inode_hash(struct inode
*);
1919 static inline void insert_inode_hash(struct inode
*inode
) {
1920 __insert_inode_hash(inode
, inode
->i_ino
);
1923 extern struct file
* get_empty_filp(void);
1924 extern void file_move(struct file
*f
, struct list_head
*list
);
1925 extern void file_kill(struct file
*f
);
1928 extern void submit_bio(int, struct bio
*);
1929 extern int bdev_read_only(struct block_device
*);
1931 extern int set_blocksize(struct block_device
*, int);
1932 extern int sb_set_blocksize(struct super_block
*, int);
1933 extern int sb_min_blocksize(struct super_block
*, int);
1934 extern int sb_has_dirty_inodes(struct super_block
*);
1936 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
1937 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
1938 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
1939 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
1940 extern ssize_t
generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1941 extern ssize_t
generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1942 extern ssize_t
generic_file_aio_write_nolock(struct kiocb
*, const struct iovec
*,
1943 unsigned long, loff_t
);
1944 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
1945 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
1946 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
1947 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
1948 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
1949 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
1950 extern int generic_segment_checks(const struct iovec
*iov
,
1951 unsigned long *nr_segs
, size_t *count
, int access_flags
);
1954 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
1955 struct pipe_inode_info
*, size_t, unsigned int);
1956 extern ssize_t
generic_file_splice_write(struct pipe_inode_info
*,
1957 struct file
*, loff_t
*, size_t, unsigned int);
1958 extern ssize_t
generic_file_splice_write_nolock(struct pipe_inode_info
*,
1959 struct file
*, loff_t
*, size_t, unsigned int);
1960 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
1961 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
1962 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
1963 size_t len
, unsigned int flags
);
1966 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
1967 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
1968 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
1969 extern loff_t
generic_file_llseek_unlocked(struct file
*file
, loff_t offset
,
1971 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
1972 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
1974 #ifdef CONFIG_FS_XIP
1975 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
1977 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
1978 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
1979 size_t len
, loff_t
*ppos
);
1980 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
1982 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
1989 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
1990 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
1991 unsigned long nr_segs
, get_block_t get_block
, dio_iodone_t end_io
,
1995 DIO_LOCKING
= 1, /* need locking between buffered and direct access */
1996 DIO_NO_LOCKING
, /* bdev; no locking at all between buffered/direct */
1997 DIO_OWN_LOCKING
, /* filesystem locks buffered and direct internally */
2000 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2001 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
2002 loff_t offset
, unsigned long nr_segs
, get_block_t get_block
,
2003 dio_iodone_t end_io
)
2005 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
2006 nr_segs
, get_block
, end_io
, DIO_LOCKING
);
2009 static inline ssize_t
blockdev_direct_IO_no_locking(int rw
, struct kiocb
*iocb
,
2010 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
2011 loff_t offset
, unsigned long nr_segs
, get_block_t get_block
,
2012 dio_iodone_t end_io
)
2014 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
2015 nr_segs
, get_block
, end_io
, DIO_NO_LOCKING
);
2018 static inline ssize_t
blockdev_direct_IO_own_locking(int rw
, struct kiocb
*iocb
,
2019 struct inode
*inode
, struct block_device
*bdev
, const struct iovec
*iov
,
2020 loff_t offset
, unsigned long nr_segs
, get_block_t get_block
,
2021 dio_iodone_t end_io
)
2023 return __blockdev_direct_IO(rw
, iocb
, inode
, bdev
, iov
, offset
,
2024 nr_segs
, get_block
, end_io
, DIO_OWN_LOCKING
);
2028 extern const struct file_operations generic_ro_fops
;
2030 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2032 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
2033 extern int vfs_follow_link(struct nameidata
*, const char *);
2034 extern int page_readlink(struct dentry
*, char __user
*, int);
2035 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2036 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2037 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2039 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2040 extern const struct inode_operations page_symlink_inode_operations
;
2041 extern int generic_readlink(struct dentry
*, char __user
*, int);
2042 extern void generic_fillattr(struct inode
*, struct kstat
*);
2043 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2044 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2045 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2046 loff_t
inode_get_bytes(struct inode
*inode
);
2047 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2049 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2051 extern int vfs_stat(char __user
*, struct kstat
*);
2052 extern int vfs_lstat(char __user
*, struct kstat
*);
2053 extern int vfs_stat_fd(int dfd
, char __user
*, struct kstat
*);
2054 extern int vfs_lstat_fd(int dfd
, char __user
*, struct kstat
*);
2055 extern int vfs_fstat(unsigned int, struct kstat
*);
2057 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2059 extern int generic_block_fiemap(struct inode
*inode
,
2060 struct fiemap_extent_info
*fieinfo
, u64 start
,
2061 u64 len
, get_block_t
*get_block
);
2063 extern void get_filesystem(struct file_system_type
*fs
);
2064 extern void put_filesystem(struct file_system_type
*fs
);
2065 extern struct file_system_type
*get_fs_type(const char *name
);
2066 extern struct super_block
*get_super(struct block_device
*);
2067 extern struct super_block
*user_get_super(dev_t
);
2068 extern void drop_super(struct super_block
*sb
);
2070 extern int dcache_dir_open(struct inode
*, struct file
*);
2071 extern int dcache_dir_close(struct inode
*, struct file
*);
2072 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2073 extern int dcache_readdir(struct file
*, void *, filldir_t
);
2074 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2075 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2076 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2077 extern int simple_unlink(struct inode
*, struct dentry
*);
2078 extern int simple_rmdir(struct inode
*, struct dentry
*);
2079 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2080 extern int simple_sync_file(struct file
*, struct dentry
*, int);
2081 extern int simple_empty(struct dentry
*);
2082 extern int simple_readpage(struct file
*file
, struct page
*page
);
2083 extern int simple_prepare_write(struct file
*file
, struct page
*page
,
2084 unsigned offset
, unsigned to
);
2085 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2086 loff_t pos
, unsigned len
, unsigned flags
,
2087 struct page
**pagep
, void **fsdata
);
2088 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2089 loff_t pos
, unsigned len
, unsigned copied
,
2090 struct page
*page
, void *fsdata
);
2092 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
2093 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2094 extern const struct file_operations simple_dir_operations
;
2095 extern const struct inode_operations simple_dir_inode_operations
;
2096 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2097 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2098 extern int simple_fill_super(struct super_block
*, int, struct tree_descr
*);
2099 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2100 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2102 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2103 loff_t
*ppos
, const void *from
, size_t available
);
2105 #ifdef CONFIG_MIGRATION
2106 extern int buffer_migrate_page(struct address_space
*,
2107 struct page
*, struct page
*);
2109 #define buffer_migrate_page NULL
2112 extern int inode_change_ok(struct inode
*, struct iattr
*);
2113 extern int __must_check
inode_setattr(struct inode
*, struct iattr
*);
2115 extern void file_update_time(struct file
*file
);
2117 extern int generic_show_options(struct seq_file
*m
, struct vfsmount
*mnt
);
2118 extern void save_mount_options(struct super_block
*sb
, char *options
);
2120 static inline ino_t
parent_ino(struct dentry
*dentry
)
2124 spin_lock(&dentry
->d_lock
);
2125 res
= dentry
->d_parent
->d_inode
->i_ino
;
2126 spin_unlock(&dentry
->d_lock
);
2130 /* Transaction based IO helpers */
2133 * An argresp is stored in an allocated page and holds the
2134 * size of the argument or response, along with its content
2136 struct simple_transaction_argresp
{
2141 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2143 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2145 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2146 size_t size
, loff_t
*pos
);
2147 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2149 static inline void simple_transaction_set(struct file
*file
, size_t n
)
2151 struct simple_transaction_argresp
*ar
= file
->private_data
;
2153 BUG_ON(n
> SIMPLE_TRANSACTION_LIMIT
);
2156 * The barrier ensures that ar->size will really remain zero until
2157 * ar->data is ready for reading.
2164 * simple attribute files
2166 * These attributes behave similar to those in sysfs:
2168 * Writing to an attribute immediately sets a value, an open file can be
2169 * written to multiple times.
2171 * Reading from an attribute creates a buffer from the value that might get
2172 * read with multiple read calls. When the attribute has been read
2173 * completely, no further read calls are possible until the file is opened
2176 * All attributes contain a text representation of a numeric value
2177 * that are accessed with the get() and set() functions.
2179 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2180 static int __fops ## _open(struct inode *inode, struct file *file) \
2182 __simple_attr_check_format(__fmt, 0ull); \
2183 return simple_attr_open(inode, file, __get, __set, __fmt); \
2185 static struct file_operations __fops = { \
2186 .owner = THIS_MODULE, \
2187 .open = __fops ## _open, \
2188 .release = simple_attr_release, \
2189 .read = simple_attr_read, \
2190 .write = simple_attr_write, \
2193 static inline void __attribute__((format(printf
, 1, 2)))
2194 __simple_attr_check_format(const char *fmt
, ...)
2196 /* don't do anything, just let the compiler check the arguments; */
2199 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2200 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2202 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2203 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2204 size_t len
, loff_t
*ppos
);
2205 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2206 size_t len
, loff_t
*ppos
);
2209 #ifdef CONFIG_SECURITY
2210 static inline char *alloc_secdata(void)
2212 return (char *)get_zeroed_page(GFP_KERNEL
);
2215 static inline void free_secdata(void *secdata
)
2217 free_page((unsigned long)secdata
);
2220 static inline char *alloc_secdata(void)
2225 static inline void free_secdata(void *secdata
)
2227 #endif /* CONFIG_SECURITY */
2230 int proc_nr_files(struct ctl_table
*table
, int write
, struct file
*filp
,
2231 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2233 int get_filesystem_list(char * buf
);
2235 #endif /* __KERNEL__ */
2236 #endif /* _LINUX_FS_H */