5 #include <linux/linkage.h>
6 #include <linux/wait.h>
7 #include <linux/kdev_t.h>
8 #include <linux/dcache.h>
9 #include <linux/path.h>
10 #include <linux/stat.h>
11 #include <linux/cache.h>
12 #include <linux/list.h>
13 #include <linux/radix-tree.h>
14 #include <linux/rbtree.h>
15 #include <linux/init.h>
16 #include <linux/pid.h>
17 #include <linux/bug.h>
18 #include <linux/mutex.h>
19 #include <linux/capability.h>
20 #include <linux/semaphore.h>
21 #include <linux/fiemap.h>
22 #include <linux/rculist_bl.h>
23 #include <linux/atomic.h>
24 #include <linux/shrinker.h>
25 #include <linux/migrate_mode.h>
26 #include <linux/uidgid.h>
27 #include <linux/lockdep.h>
28 #include <linux/percpu-rwsem.h>
29 #include <linux/blk_types.h>
31 #include <asm/byteorder.h>
32 #include <uapi/linux/fs.h>
34 struct export_operations
;
40 struct pipe_inode_info
;
41 struct poll_table_struct
;
43 struct vm_area_struct
;
46 struct swap_info_struct
;
48 extern void __init
inode_init(void);
49 extern void __init
inode_init_early(void);
50 extern void __init
files_init(unsigned long);
52 extern struct files_stat_struct files_stat
;
53 extern unsigned long get_max_files(void);
54 extern int sysctl_nr_open
;
55 extern struct inodes_stat_t inodes_stat
;
56 extern int leases_enable
, lease_break_time
;
57 extern int sysctl_protected_symlinks
;
58 extern int sysctl_protected_hardlinks
;
61 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
62 struct buffer_head
*bh_result
, int create
);
63 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
64 ssize_t bytes
, void *private, int ret
,
67 #define MAY_EXEC 0x00000001
68 #define MAY_WRITE 0x00000002
69 #define MAY_READ 0x00000004
70 #define MAY_APPEND 0x00000008
71 #define MAY_ACCESS 0x00000010
72 #define MAY_OPEN 0x00000020
73 #define MAY_CHDIR 0x00000040
74 /* called from RCU mode, don't block */
75 #define MAY_NOT_BLOCK 0x00000080
78 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
79 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
82 /* file is open for reading */
83 #define FMODE_READ ((__force fmode_t)0x1)
84 /* file is open for writing */
85 #define FMODE_WRITE ((__force fmode_t)0x2)
86 /* file is seekable */
87 #define FMODE_LSEEK ((__force fmode_t)0x4)
88 /* file can be accessed using pread */
89 #define FMODE_PREAD ((__force fmode_t)0x8)
90 /* file can be accessed using pwrite */
91 #define FMODE_PWRITE ((__force fmode_t)0x10)
92 /* File is opened for execution with sys_execve / sys_uselib */
93 #define FMODE_EXEC ((__force fmode_t)0x20)
94 /* File is opened with O_NDELAY (only set for block devices) */
95 #define FMODE_NDELAY ((__force fmode_t)0x40)
96 /* File is opened with O_EXCL (only set for block devices) */
97 #define FMODE_EXCL ((__force fmode_t)0x80)
98 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
99 (specialy hack for floppy.c) */
100 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
101 /* 32bit hashes as llseek() offset (for directories) */
102 #define FMODE_32BITHASH ((__force fmode_t)0x200)
103 /* 64bit hashes as llseek() offset (for directories) */
104 #define FMODE_64BITHASH ((__force fmode_t)0x400)
107 * Don't update ctime and mtime.
109 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
110 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
112 #define FMODE_NOCMTIME ((__force fmode_t)0x800)
114 /* Expect random access pattern */
115 #define FMODE_RANDOM ((__force fmode_t)0x1000)
117 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
118 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
120 /* File is opened with O_PATH; almost nothing can be done with it */
121 #define FMODE_PATH ((__force fmode_t)0x4000)
123 /* File was opened by fanotify and shouldn't generate fanotify events */
124 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
127 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
128 * that indicates that they should check the contents of the iovec are
129 * valid, but not check the memory that the iovec elements
132 #define CHECK_IOVEC_ONLY -1
139 * The below are the various read and write types that we support. Some of
140 * them include behavioral modifiers that send information down to the
141 * block layer and IO scheduler. Terminology:
143 * The block layer uses device plugging to defer IO a little bit, in
144 * the hope that we will see more IO very shortly. This increases
145 * coalescing of adjacent IO and thus reduces the number of IOs we
146 * have to send to the device. It also allows for better queuing,
147 * if the IO isn't mergeable. If the caller is going to be waiting
148 * for the IO, then he must ensure that the device is unplugged so
149 * that the IO is dispatched to the driver.
151 * All IO is handled async in Linux. This is fine for background
152 * writes, but for reads or writes that someone waits for completion
153 * on, we want to notify the block layer and IO scheduler so that they
154 * know about it. That allows them to make better scheduling
155 * decisions. So when the below references 'sync' and 'async', it
156 * is referencing this priority hint.
158 * With that in mind, the available types are:
160 * READ A normal read operation. Device will be plugged.
161 * READ_SYNC A synchronous read. Device is not plugged, caller can
162 * immediately wait on this read without caring about
164 * READA Used for read-ahead operations. Lower priority, and the
165 * block layer could (in theory) choose to ignore this
166 * request if it runs into resource problems.
167 * WRITE A normal async write. Device will be plugged.
168 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down
169 * the hint that someone will be waiting on this IO
170 * shortly. The write equivalent of READ_SYNC.
171 * WRITE_ODIRECT Special case write for O_DIRECT only.
172 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
173 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
174 * non-volatile media on completion.
175 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
176 * by a cache flush and data is guaranteed to be on
177 * non-volatile media on completion.
180 #define RW_MASK REQ_WRITE
181 #define RWA_MASK REQ_RAHEAD
184 #define WRITE RW_MASK
185 #define READA RWA_MASK
186 #define KERNEL_READ (READ|REQ_KERNEL)
187 #define KERNEL_WRITE (WRITE|REQ_KERNEL)
189 #define READ_SYNC (READ | REQ_SYNC)
190 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
191 #define WRITE_ODIRECT (WRITE | REQ_SYNC)
192 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
193 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
194 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
197 * Attribute flags. These should be or-ed together to figure out what
200 #define ATTR_MODE (1 << 0)
201 #define ATTR_UID (1 << 1)
202 #define ATTR_GID (1 << 2)
203 #define ATTR_SIZE (1 << 3)
204 #define ATTR_ATIME (1 << 4)
205 #define ATTR_MTIME (1 << 5)
206 #define ATTR_CTIME (1 << 6)
207 #define ATTR_ATIME_SET (1 << 7)
208 #define ATTR_MTIME_SET (1 << 8)
209 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
210 #define ATTR_ATTR_FLAG (1 << 10)
211 #define ATTR_KILL_SUID (1 << 11)
212 #define ATTR_KILL_SGID (1 << 12)
213 #define ATTR_FILE (1 << 13)
214 #define ATTR_KILL_PRIV (1 << 14)
215 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
216 #define ATTR_TIMES_SET (1 << 16)
219 * This is the Inode Attributes structure, used for notify_change(). It
220 * uses the above definitions as flags, to know which values have changed.
221 * Also, in this manner, a Filesystem can look at only the values it cares
222 * about. Basically, these are the attributes that the VFS layer can
223 * request to change from the FS layer.
225 * Derek Atkins <warlord@MIT.EDU> 94-10-20
228 unsigned int ia_valid
;
233 struct timespec ia_atime
;
234 struct timespec ia_mtime
;
235 struct timespec ia_ctime
;
238 * Not an attribute, but an auxiliary info for filesystems wanting to
239 * implement an ftruncate() like method. NOTE: filesystem should
240 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
242 struct file
*ia_file
;
246 * Includes for diskquotas.
248 #include <linux/quota.h>
251 * enum positive_aop_returns - aop return codes with specific semantics
253 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
254 * completed, that the page is still locked, and
255 * should be considered active. The VM uses this hint
256 * to return the page to the active list -- it won't
257 * be a candidate for writeback again in the near
258 * future. Other callers must be careful to unlock
259 * the page if they get this return. Returned by
262 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
263 * unlocked it and the page might have been truncated.
264 * The caller should back up to acquiring a new page and
265 * trying again. The aop will be taking reasonable
266 * precautions not to livelock. If the caller held a page
267 * reference, it should drop it before retrying. Returned
270 * address_space_operation functions return these large constants to indicate
271 * special semantics to the caller. These are much larger than the bytes in a
272 * page to allow for functions that return the number of bytes operated on in a
276 enum positive_aop_returns
{
277 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
278 AOP_TRUNCATED_PAGE
= 0x80001,
281 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
282 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
283 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
284 * helper code (eg buffer layer)
285 * to clear GFP_FS from alloc */
288 * oh the beauties of C type declarations.
291 struct address_space
;
292 struct writeback_control
;
295 const struct iovec
*iov
;
296 unsigned long nr_segs
;
301 size_t iov_iter_copy_from_user_atomic(struct page
*page
,
302 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
303 size_t iov_iter_copy_from_user(struct page
*page
,
304 struct iov_iter
*i
, unsigned long offset
, size_t bytes
);
305 void iov_iter_advance(struct iov_iter
*i
, size_t bytes
);
306 int iov_iter_fault_in_readable(struct iov_iter
*i
, size_t bytes
);
307 size_t iov_iter_single_seg_count(struct iov_iter
*i
);
309 static inline void iov_iter_init(struct iov_iter
*i
,
310 const struct iovec
*iov
, unsigned long nr_segs
,
311 size_t count
, size_t written
)
314 i
->nr_segs
= nr_segs
;
316 i
->count
= count
+ written
;
318 iov_iter_advance(i
, written
);
321 static inline size_t iov_iter_count(struct iov_iter
*i
)
327 * "descriptor" for what we're up to with a read.
328 * This allows us to use the same read code yet
329 * have multiple different users of the data that
330 * we read from a file.
332 * The simplest case just copies the data to user
345 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
346 unsigned long, unsigned long);
348 struct address_space_operations
{
349 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
350 int (*readpage
)(struct file
*, struct page
*);
352 /* Write back some dirty pages from this mapping. */
353 int (*writepages
)(struct address_space
*, struct writeback_control
*);
355 /* Set a page dirty. Return true if this dirtied it */
356 int (*set_page_dirty
)(struct page
*page
);
358 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
359 struct list_head
*pages
, unsigned nr_pages
);
361 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
362 loff_t pos
, unsigned len
, unsigned flags
,
363 struct page
**pagep
, void **fsdata
);
364 int (*write_end
)(struct file
*, struct address_space
*mapping
,
365 loff_t pos
, unsigned len
, unsigned copied
,
366 struct page
*page
, void *fsdata
);
368 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
369 sector_t (*bmap
)(struct address_space
*, sector_t
);
370 void (*invalidatepage
) (struct page
*, unsigned long);
371 int (*releasepage
) (struct page
*, gfp_t
);
372 void (*freepage
)(struct page
*);
373 ssize_t (*direct_IO
)(int, struct kiocb
*, const struct iovec
*iov
,
374 loff_t offset
, unsigned long nr_segs
);
375 int (*get_xip_mem
)(struct address_space
*, pgoff_t
, int,
376 void **, unsigned long *);
378 * migrate the contents of a page to the specified target. If sync
379 * is false, it must not block.
381 int (*migratepage
) (struct address_space
*,
382 struct page
*, struct page
*, enum migrate_mode
);
383 int (*launder_page
) (struct page
*);
384 int (*is_partially_uptodate
) (struct page
*, read_descriptor_t
*,
386 int (*error_remove_page
)(struct address_space
*, struct page
*);
388 /* swapfile support */
389 int (*swap_activate
)(struct swap_info_struct
*sis
, struct file
*file
,
391 void (*swap_deactivate
)(struct file
*file
);
394 extern const struct address_space_operations empty_aops
;
397 * pagecache_write_begin/pagecache_write_end must be used by general code
398 * to write into the pagecache.
400 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
401 loff_t pos
, unsigned len
, unsigned flags
,
402 struct page
**pagep
, void **fsdata
);
404 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
405 loff_t pos
, unsigned len
, unsigned copied
,
406 struct page
*page
, void *fsdata
);
408 struct backing_dev_info
;
409 struct address_space
{
410 struct inode
*host
; /* owner: inode, block_device */
411 struct radix_tree_root page_tree
; /* radix tree of all pages */
412 spinlock_t tree_lock
; /* and lock protecting it */
413 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
414 struct rb_root i_mmap
; /* tree of private and shared mappings */
415 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
416 struct mutex i_mmap_mutex
; /* protect tree, count, list */
417 /* Protected by tree_lock together with the radix tree */
418 unsigned long nrpages
; /* number of total pages */
419 pgoff_t writeback_index
;/* writeback starts here */
420 const struct address_space_operations
*a_ops
; /* methods */
421 unsigned long flags
; /* error bits/gfp mask */
422 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
423 spinlock_t private_lock
; /* for use by the address_space */
424 struct list_head private_list
; /* ditto */
425 struct address_space
*assoc_mapping
; /* ditto */
426 } __attribute__((aligned(sizeof(long))));
428 * On most architectures that alignment is already the case; but
429 * must be enforced here for CRIS, to let the least significant bit
430 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
432 struct request_queue
;
434 struct block_device
{
435 dev_t bd_dev
; /* not a kdev_t - it's a search key */
437 struct inode
* bd_inode
; /* will die */
438 struct super_block
* bd_super
;
439 struct mutex bd_mutex
; /* open/close mutex */
440 struct list_head bd_inodes
;
444 bool bd_write_holder
;
446 struct list_head bd_holder_disks
;
448 struct block_device
* bd_contains
;
449 unsigned bd_block_size
;
450 struct hd_struct
* bd_part
;
451 /* number of times partitions within this device have been opened. */
452 unsigned bd_part_count
;
454 struct gendisk
* bd_disk
;
455 struct request_queue
* bd_queue
;
456 struct list_head bd_list
;
458 * Private data. You must have bd_claim'ed the block_device
459 * to use this. NOTE: bd_claim allows an owner to claim
460 * the same device multiple times, the owner must take special
461 * care to not mess up bd_private for that case.
463 unsigned long bd_private
;
465 /* The counter of freeze processes */
466 int bd_fsfreeze_count
;
467 /* Mutex for freeze */
468 struct mutex bd_fsfreeze_mutex
;
469 /* A semaphore that prevents I/O while block size is being changed */
470 struct percpu_rw_semaphore bd_block_size_semaphore
;
474 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
477 #define PAGECACHE_TAG_DIRTY 0
478 #define PAGECACHE_TAG_WRITEBACK 1
479 #define PAGECACHE_TAG_TOWRITE 2
481 int mapping_tagged(struct address_space
*mapping
, int tag
);
484 * Might pages of this file be mapped into userspace?
486 static inline int mapping_mapped(struct address_space
*mapping
)
488 return !RB_EMPTY_ROOT(&mapping
->i_mmap
) ||
489 !list_empty(&mapping
->i_mmap_nonlinear
);
493 * Might pages of this file have been modified in userspace?
494 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
495 * marks vma as VM_SHARED if it is shared, and the file was opened for
496 * writing i.e. vma may be mprotected writable even if now readonly.
498 static inline int mapping_writably_mapped(struct address_space
*mapping
)
500 return mapping
->i_mmap_writable
!= 0;
504 * Use sequence counter to get consistent i_size on 32-bit processors.
506 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
507 #include <linux/seqlock.h>
508 #define __NEED_I_SIZE_ORDERED
509 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
511 #define i_size_ordered_init(inode) do { } while (0)
515 #define ACL_NOT_CACHED ((void *)(-1))
517 #define IOP_FASTPERM 0x0001
518 #define IOP_LOOKUP 0x0002
519 #define IOP_NOFOLLOW 0x0004
522 * Keep mostly read-only and often accessed (especially for
523 * the RCU path lookup and 'stat' data) fields at the beginning
524 * of the 'struct inode'
528 unsigned short i_opflags
;
531 unsigned int i_flags
;
533 #ifdef CONFIG_FS_POSIX_ACL
534 struct posix_acl
*i_acl
;
535 struct posix_acl
*i_default_acl
;
538 const struct inode_operations
*i_op
;
539 struct super_block
*i_sb
;
540 struct address_space
*i_mapping
;
542 #ifdef CONFIG_SECURITY
546 /* Stat data, not accessed from path walking */
549 * Filesystems may only read i_nlink directly. They shall use the
550 * following functions for modification:
552 * (set|clear|inc|drop)_nlink
553 * inode_(inc|dec)_link_count
556 const unsigned int i_nlink
;
557 unsigned int __i_nlink
;
561 struct timespec i_atime
;
562 struct timespec i_mtime
;
563 struct timespec i_ctime
;
564 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
565 unsigned short i_bytes
;
566 unsigned int i_blkbits
;
569 #ifdef __NEED_I_SIZE_ORDERED
570 seqcount_t i_size_seqcount
;
574 unsigned long i_state
;
575 struct mutex i_mutex
;
577 unsigned long dirtied_when
; /* jiffies of first dirtying */
579 struct hlist_node i_hash
;
580 struct list_head i_wb_list
; /* backing dev IO list */
581 struct list_head i_lru
; /* inode LRU list */
582 struct list_head i_sb_list
;
584 struct hlist_head i_dentry
;
585 struct rcu_head i_rcu
;
589 atomic_t i_dio_count
;
590 atomic_t i_writecount
;
591 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
592 struct file_lock
*i_flock
;
593 struct address_space i_data
;
595 struct dquot
*i_dquot
[MAXQUOTAS
];
597 struct list_head i_devices
;
599 struct pipe_inode_info
*i_pipe
;
600 struct block_device
*i_bdev
;
606 #ifdef CONFIG_FSNOTIFY
607 __u32 i_fsnotify_mask
; /* all events this inode cares about */
608 struct hlist_head i_fsnotify_marks
;
612 atomic_t i_readcount
; /* struct files open RO */
614 void *i_private
; /* fs or device private pointer */
617 static inline int inode_unhashed(struct inode
*inode
)
619 return hlist_unhashed(&inode
->i_hash
);
623 * inode->i_mutex nesting subclasses for the lock validator:
625 * 0: the object of the current VFS operation
630 * The locking order between these classes is
631 * parent -> child -> normal -> xattr -> quota
633 enum inode_i_mutex_lock_class
643 * NOTE: in a 32bit arch with a preemptable kernel and
644 * an UP compile the i_size_read/write must be atomic
645 * with respect to the local cpu (unlike with preempt disabled),
646 * but they don't need to be atomic with respect to other cpus like in
647 * true SMP (so they need either to either locally disable irq around
648 * the read or for example on x86 they can be still implemented as a
649 * cmpxchg8b without the need of the lock prefix). For SMP compiles
650 * and 64bit archs it makes no difference if preempt is enabled or not.
652 static inline loff_t
i_size_read(const struct inode
*inode
)
654 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
659 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
660 i_size
= inode
->i_size
;
661 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
663 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
667 i_size
= inode
->i_size
;
671 return inode
->i_size
;
676 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
677 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
678 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
680 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
682 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
683 write_seqcount_begin(&inode
->i_size_seqcount
);
684 inode
->i_size
= i_size
;
685 write_seqcount_end(&inode
->i_size_seqcount
);
686 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
688 inode
->i_size
= i_size
;
691 inode
->i_size
= i_size
;
695 /* Helper functions so that in most cases filesystems will
696 * not need to deal directly with kuid_t and kgid_t and can
697 * instead deal with the raw numeric values that are stored
700 static inline uid_t
i_uid_read(const struct inode
*inode
)
702 return from_kuid(&init_user_ns
, inode
->i_uid
);
705 static inline gid_t
i_gid_read(const struct inode
*inode
)
707 return from_kgid(&init_user_ns
, inode
->i_gid
);
710 static inline void i_uid_write(struct inode
*inode
, uid_t uid
)
712 inode
->i_uid
= make_kuid(&init_user_ns
, uid
);
715 static inline void i_gid_write(struct inode
*inode
, gid_t gid
)
717 inode
->i_gid
= make_kgid(&init_user_ns
, gid
);
720 static inline unsigned iminor(const struct inode
*inode
)
722 return MINOR(inode
->i_rdev
);
725 static inline unsigned imajor(const struct inode
*inode
)
727 return MAJOR(inode
->i_rdev
);
730 extern struct block_device
*I_BDEV(struct inode
*inode
);
733 rwlock_t lock
; /* protects pid, uid, euid fields */
734 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
735 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
736 kuid_t uid
, euid
; /* uid/euid of process setting the owner */
737 int signum
; /* posix.1b rt signal to be delivered on IO */
741 * Track a single file's readahead state
743 struct file_ra_state
{
744 pgoff_t start
; /* where readahead started */
745 unsigned int size
; /* # of readahead pages */
746 unsigned int async_size
; /* do asynchronous readahead when
747 there are only # of pages ahead */
749 unsigned int ra_pages
; /* Maximum readahead window */
750 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
751 loff_t prev_pos
; /* Cache last read() position */
755 * Check if @index falls in the readahead windows.
757 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
759 return (index
>= ra
->start
&&
760 index
< ra
->start
+ ra
->size
);
763 #define FILE_MNT_WRITE_TAKEN 1
764 #define FILE_MNT_WRITE_RELEASED 2
768 * fu_list becomes invalid after file_free is called and queued via
769 * fu_rcuhead for RCU freeing
772 struct list_head fu_list
;
773 struct rcu_head fu_rcuhead
;
776 #define f_dentry f_path.dentry
777 #define f_vfsmnt f_path.mnt
778 const struct file_operations
*f_op
;
781 * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.
782 * Must not be taken from IRQ context.
788 atomic_long_t f_count
;
789 unsigned int f_flags
;
792 struct fown_struct f_owner
;
793 const struct cred
*f_cred
;
794 struct file_ra_state f_ra
;
797 #ifdef CONFIG_SECURITY
800 /* needed for tty driver, and maybe others */
804 /* Used by fs/eventpoll.c to link all the hooks to this file */
805 struct list_head f_ep_links
;
806 struct list_head f_tfile_llink
;
807 #endif /* #ifdef CONFIG_EPOLL */
808 struct address_space
*f_mapping
;
809 #ifdef CONFIG_DEBUG_WRITECOUNT
810 unsigned long f_mnt_write_state
;
817 /* file identifier */
818 unsigned char f_handle
[0];
821 static inline struct file
*get_file(struct file
*f
)
823 atomic_long_inc(&f
->f_count
);
826 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
827 #define file_count(x) atomic_long_read(&(x)->f_count)
829 #ifdef CONFIG_DEBUG_WRITECOUNT
830 static inline void file_take_write(struct file
*f
)
832 WARN_ON(f
->f_mnt_write_state
!= 0);
833 f
->f_mnt_write_state
= FILE_MNT_WRITE_TAKEN
;
835 static inline void file_release_write(struct file
*f
)
837 f
->f_mnt_write_state
|= FILE_MNT_WRITE_RELEASED
;
839 static inline void file_reset_write(struct file
*f
)
841 f
->f_mnt_write_state
= 0;
843 static inline void file_check_state(struct file
*f
)
846 * At this point, either both or neither of these bits
849 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
);
850 WARN_ON(f
->f_mnt_write_state
== FILE_MNT_WRITE_RELEASED
);
852 static inline int file_check_writeable(struct file
*f
)
854 if (f
->f_mnt_write_state
== FILE_MNT_WRITE_TAKEN
)
856 printk(KERN_WARNING
"writeable file with no "
857 "mnt_want_write()\n");
861 #else /* !CONFIG_DEBUG_WRITECOUNT */
862 static inline void file_take_write(struct file
*filp
) {}
863 static inline void file_release_write(struct file
*filp
) {}
864 static inline void file_reset_write(struct file
*filp
) {}
865 static inline void file_check_state(struct file
*filp
) {}
866 static inline int file_check_writeable(struct file
*filp
)
870 #endif /* CONFIG_DEBUG_WRITECOUNT */
872 #define MAX_NON_LFS ((1UL<<31) - 1)
874 /* Page cache limit. The filesystems should put that into their s_maxbytes
875 limits, otherwise bad things can happen in VM. */
876 #if BITS_PER_LONG==32
877 #define MAX_LFS_FILESIZE (((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
878 #elif BITS_PER_LONG==64
879 #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL)
884 #define FL_ACCESS 8 /* not trying to lock, just looking */
885 #define FL_EXISTS 16 /* when unlocking, test for existence */
886 #define FL_LEASE 32 /* lease held on this file */
887 #define FL_CLOSE 64 /* unlock on close */
888 #define FL_SLEEP 128 /* A blocking lock */
889 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
890 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
893 * Special return value from posix_lock_file() and vfs_lock_file() for
894 * asynchronous locking.
896 #define FILE_LOCK_DEFERRED 1
899 * The POSIX file lock owner is determined by
900 * the "struct files_struct" in the thread group
901 * (or NULL for no owner - BSD locks).
903 * Lockd stuffs a "host" pointer into this.
905 typedef struct files_struct
*fl_owner_t
;
907 struct file_lock_operations
{
908 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
909 void (*fl_release_private
)(struct file_lock
*);
912 struct lock_manager_operations
{
913 int (*lm_compare_owner
)(struct file_lock
*, struct file_lock
*);
914 void (*lm_notify
)(struct file_lock
*); /* unblock callback */
915 int (*lm_grant
)(struct file_lock
*, struct file_lock
*, int);
916 void (*lm_break
)(struct file_lock
*);
917 int (*lm_change
)(struct file_lock
**, int);
920 struct lock_manager
{
921 struct list_head list
;
925 void locks_start_grace(struct net
*, struct lock_manager
*);
926 void locks_end_grace(struct lock_manager
*);
927 int locks_in_grace(struct net
*);
929 /* that will die - we need it for nfs_lock_info */
930 #include <linux/nfs_fs_i.h>
933 struct file_lock
*fl_next
; /* singly linked list for this inode */
934 struct list_head fl_link
; /* doubly linked list of all locks */
935 struct list_head fl_block
; /* circular list of blocked processes */
937 unsigned int fl_flags
;
938 unsigned char fl_type
;
940 struct pid
*fl_nspid
;
941 wait_queue_head_t fl_wait
;
942 struct file
*fl_file
;
946 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
947 /* for lease breaks: */
948 unsigned long fl_break_time
;
949 unsigned long fl_downgrade_time
;
951 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
952 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
954 struct nfs_lock_info nfs_fl
;
955 struct nfs4_lock_info nfs4_fl
;
957 struct list_head link
; /* link in AFS vnode's pending_locks list */
958 int state
; /* state of grant or error if -ve */
963 /* The following constant reflects the upper bound of the file/locking space */
965 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
966 #define OFFSET_MAX INT_LIMIT(loff_t)
967 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
970 #include <linux/fcntl.h>
972 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
974 #ifdef CONFIG_FILE_LOCKING
975 extern int fcntl_getlk(struct file
*, struct flock __user
*);
976 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
977 struct flock __user
*);
979 #if BITS_PER_LONG == 32
980 extern int fcntl_getlk64(struct file
*, struct flock64 __user
*);
981 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
982 struct flock64 __user
*);
985 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
986 extern int fcntl_getlease(struct file
*filp
);
989 void locks_free_lock(struct file_lock
*fl
);
990 extern void locks_init_lock(struct file_lock
*);
991 extern struct file_lock
* locks_alloc_lock(void);
992 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
993 extern void __locks_copy_lock(struct file_lock
*, const struct file_lock
*);
994 extern void locks_remove_posix(struct file
*, fl_owner_t
);
995 extern void locks_remove_flock(struct file
*);
996 extern void locks_release_private(struct file_lock
*);
997 extern void posix_test_lock(struct file
*, struct file_lock
*);
998 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
999 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
1000 extern int posix_unblock_lock(struct file
*, struct file_lock
*);
1001 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1002 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1003 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1004 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
1005 extern int __break_lease(struct inode
*inode
, unsigned int flags
);
1006 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
1007 extern int generic_setlease(struct file
*, long, struct file_lock
**);
1008 extern int vfs_setlease(struct file
*, long, struct file_lock
**);
1009 extern int lease_modify(struct file_lock
**, int);
1010 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
1011 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
1012 extern void locks_delete_block(struct file_lock
*waiter
);
1013 extern void lock_flocks(void);
1014 extern void unlock_flocks(void);
1015 #else /* !CONFIG_FILE_LOCKING */
1016 static inline int fcntl_getlk(struct file
*file
, struct flock __user
*user
)
1021 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
1022 unsigned int cmd
, struct flock __user
*user
)
1027 #if BITS_PER_LONG == 32
1028 static inline int fcntl_getlk64(struct file
*file
, struct flock64 __user
*user
)
1033 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1034 unsigned int cmd
, struct flock64 __user
*user
)
1039 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1044 static inline int fcntl_getlease(struct file
*filp
)
1049 static inline void locks_init_lock(struct file_lock
*fl
)
1054 static inline void __locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1059 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1064 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1069 static inline void locks_remove_flock(struct file
*filp
)
1074 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1079 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1080 struct file_lock
*conflock
)
1085 static inline int posix_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1090 static inline int posix_unblock_lock(struct file
*filp
,
1091 struct file_lock
*waiter
)
1096 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1101 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1102 struct file_lock
*fl
, struct file_lock
*conf
)
1107 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1112 static inline int flock_lock_file_wait(struct file
*filp
,
1113 struct file_lock
*request
)
1118 static inline int __break_lease(struct inode
*inode
, unsigned int mode
)
1123 static inline void lease_get_mtime(struct inode
*inode
, struct timespec
*time
)
1128 static inline int generic_setlease(struct file
*filp
, long arg
,
1129 struct file_lock
**flp
)
1134 static inline int vfs_setlease(struct file
*filp
, long arg
,
1135 struct file_lock
**lease
)
1140 static inline int lease_modify(struct file_lock
**before
, int arg
)
1145 static inline int lock_may_read(struct inode
*inode
, loff_t start
,
1151 static inline int lock_may_write(struct inode
*inode
, loff_t start
,
1157 static inline void locks_delete_block(struct file_lock
*waiter
)
1161 static inline void lock_flocks(void)
1165 static inline void unlock_flocks(void)
1169 #endif /* !CONFIG_FILE_LOCKING */
1172 struct fasync_struct
{
1176 struct fasync_struct
*fa_next
; /* singly linked list */
1177 struct file
*fa_file
;
1178 struct rcu_head fa_rcu
;
1181 #define FASYNC_MAGIC 0x4601
1183 /* SMP safe fasync helpers: */
1184 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1185 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1186 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1187 extern struct fasync_struct
*fasync_alloc(void);
1188 extern void fasync_free(struct fasync_struct
*);
1190 /* can be called from interrupts */
1191 extern void kill_fasync(struct fasync_struct
**, int, int);
1193 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1194 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1195 extern void f_delown(struct file
*filp
);
1196 extern pid_t
f_getown(struct file
*filp
);
1197 extern int send_sigurg(struct fown_struct
*fown
);
1205 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1206 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1207 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1208 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1209 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1211 extern struct list_head super_blocks
;
1212 extern spinlock_t sb_lock
;
1214 /* Possible states of 'frozen' field */
1216 SB_UNFROZEN
= 0, /* FS is unfrozen */
1217 SB_FREEZE_WRITE
= 1, /* Writes, dir ops, ioctls frozen */
1218 SB_FREEZE_PAGEFAULT
= 2, /* Page faults stopped as well */
1219 SB_FREEZE_FS
= 3, /* For internal FS use (e.g. to stop
1220 * internal threads if needed) */
1221 SB_FREEZE_COMPLETE
= 4, /* ->freeze_fs finished successfully */
1224 #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
1227 /* Counters for counting writers at each level */
1228 struct percpu_counter counter
[SB_FREEZE_LEVELS
];
1229 wait_queue_head_t wait
; /* queue for waiting for
1230 writers / faults to finish */
1231 int frozen
; /* Is sb frozen? */
1232 wait_queue_head_t wait_unfrozen
; /* queue for waiting for
1234 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1235 struct lockdep_map lock_map
[SB_FREEZE_LEVELS
];
1239 struct super_block
{
1240 struct list_head s_list
; /* Keep this first */
1241 dev_t s_dev
; /* search index; _not_ kdev_t */
1242 unsigned char s_blocksize_bits
;
1243 unsigned long s_blocksize
;
1244 loff_t s_maxbytes
; /* Max file size */
1245 struct file_system_type
*s_type
;
1246 const struct super_operations
*s_op
;
1247 const struct dquot_operations
*dq_op
;
1248 const struct quotactl_ops
*s_qcop
;
1249 const struct export_operations
*s_export_op
;
1250 unsigned long s_flags
;
1251 unsigned long s_magic
;
1252 struct dentry
*s_root
;
1253 struct rw_semaphore s_umount
;
1256 #ifdef CONFIG_SECURITY
1259 const struct xattr_handler
**s_xattr
;
1261 struct list_head s_inodes
; /* all inodes */
1262 struct hlist_bl_head s_anon
; /* anonymous dentries for (nfs) exporting */
1264 struct list_head __percpu
*s_files
;
1266 struct list_head s_files
;
1268 struct list_head s_mounts
; /* list of mounts; _not_ for fs use */
1269 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1270 struct list_head s_dentry_lru
; /* unused dentry lru */
1271 int s_nr_dentry_unused
; /* # of dentry on lru */
1273 /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
1274 spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp
;
1275 struct list_head s_inode_lru
; /* unused inode lru */
1276 int s_nr_inodes_unused
; /* # of inodes on lru */
1278 struct block_device
*s_bdev
;
1279 struct backing_dev_info
*s_bdi
;
1280 struct mtd_info
*s_mtd
;
1281 struct hlist_node s_instances
;
1282 struct quota_info s_dquot
; /* Diskquota specific options */
1284 struct sb_writers s_writers
;
1286 char s_id
[32]; /* Informational name */
1287 u8 s_uuid
[16]; /* UUID */
1289 void *s_fs_info
; /* Filesystem private info */
1290 unsigned int s_max_links
;
1293 /* Granularity of c/m/atime in ns.
1294 Cannot be worse than a second */
1298 * The next field is for VFS *only*. No filesystems have any business
1299 * even looking at it. You had been warned.
1301 struct mutex s_vfs_rename_mutex
; /* Kludge */
1304 * Filesystem subtype. If non-empty the filesystem type field
1305 * in /proc/mounts will be "type.subtype"
1310 * Saved mount options for lazy filesystems using
1311 * generic_show_options()
1313 char __rcu
*s_options
;
1314 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1317 * Saved pool identifier for cleancache (-1 means none)
1319 int cleancache_poolid
;
1321 struct shrinker s_shrink
; /* per-sb shrinker handle */
1323 /* Number of inodes with nlink == 0 but still referenced */
1324 atomic_long_t s_remove_count
;
1326 /* Being remounted read-only */
1327 int s_readonly_remount
;
1330 /* superblock cache pruning functions */
1331 extern void prune_icache_sb(struct super_block
*sb
, int nr_to_scan
);
1332 extern void prune_dcache_sb(struct super_block
*sb
, int nr_to_scan
);
1334 extern struct timespec
current_fs_time(struct super_block
*sb
);
1337 * Snapshotting support.
1340 void __sb_end_write(struct super_block
*sb
, int level
);
1341 int __sb_start_write(struct super_block
*sb
, int level
, bool wait
);
1344 * sb_end_write - drop write access to a superblock
1345 * @sb: the super we wrote to
1347 * Decrement number of writers to the filesystem. Wake up possible waiters
1348 * wanting to freeze the filesystem.
1350 static inline void sb_end_write(struct super_block
*sb
)
1352 __sb_end_write(sb
, SB_FREEZE_WRITE
);
1356 * sb_end_pagefault - drop write access to a superblock from a page fault
1357 * @sb: the super we wrote to
1359 * Decrement number of processes handling write page fault to the filesystem.
1360 * Wake up possible waiters wanting to freeze the filesystem.
1362 static inline void sb_end_pagefault(struct super_block
*sb
)
1364 __sb_end_write(sb
, SB_FREEZE_PAGEFAULT
);
1368 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
1369 * @sb: the super we wrote to
1371 * Decrement fs-internal number of writers to the filesystem. Wake up possible
1372 * waiters wanting to freeze the filesystem.
1374 static inline void sb_end_intwrite(struct super_block
*sb
)
1376 __sb_end_write(sb
, SB_FREEZE_FS
);
1380 * sb_start_write - get write access to a superblock
1381 * @sb: the super we write to
1383 * When a process wants to write data or metadata to a file system (i.e. dirty
1384 * a page or an inode), it should embed the operation in a sb_start_write() -
1385 * sb_end_write() pair to get exclusion against file system freezing. This
1386 * function increments number of writers preventing freezing. If the file
1387 * system is already frozen, the function waits until the file system is
1390 * Since freeze protection behaves as a lock, users have to preserve
1391 * ordering of freeze protection and other filesystem locks. Generally,
1392 * freeze protection should be the outermost lock. In particular, we have:
1395 * -> i_mutex (write path, truncate, directory ops, ...)
1396 * -> s_umount (freeze_super, thaw_super)
1398 static inline void sb_start_write(struct super_block
*sb
)
1400 __sb_start_write(sb
, SB_FREEZE_WRITE
, true);
1403 static inline int sb_start_write_trylock(struct super_block
*sb
)
1405 return __sb_start_write(sb
, SB_FREEZE_WRITE
, false);
1409 * sb_start_pagefault - get write access to a superblock from a page fault
1410 * @sb: the super we write to
1412 * When a process starts handling write page fault, it should embed the
1413 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
1414 * exclusion against file system freezing. This is needed since the page fault
1415 * is going to dirty a page. This function increments number of running page
1416 * faults preventing freezing. If the file system is already frozen, the
1417 * function waits until the file system is thawed.
1419 * Since page fault freeze protection behaves as a lock, users have to preserve
1420 * ordering of freeze protection and other filesystem locks. It is advised to
1421 * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
1422 * handling code implies lock dependency:
1425 * -> sb_start_pagefault
1427 static inline void sb_start_pagefault(struct super_block
*sb
)
1429 __sb_start_write(sb
, SB_FREEZE_PAGEFAULT
, true);
1433 * sb_start_intwrite - get write access to a superblock for internal fs purposes
1434 * @sb: the super we write to
1436 * This is the third level of protection against filesystem freezing. It is
1437 * free for use by a filesystem. The only requirement is that it must rank
1438 * below sb_start_pagefault.
1440 * For example filesystem can call sb_start_intwrite() when starting a
1441 * transaction which somewhat eases handling of freezing for internal sources
1442 * of filesystem changes (internal fs threads, discarding preallocation on file
1445 static inline void sb_start_intwrite(struct super_block
*sb
)
1447 __sb_start_write(sb
, SB_FREEZE_FS
, true);
1451 extern bool inode_owner_or_capable(const struct inode
*inode
);
1453 /* not quite ready to be deprecated, but... */
1454 extern void lock_super(struct super_block
*);
1455 extern void unlock_super(struct super_block
*);
1458 * VFS helper functions..
1460 extern int vfs_create(struct inode
*, struct dentry
*, umode_t
, bool);
1461 extern int vfs_mkdir(struct inode
*, struct dentry
*, umode_t
);
1462 extern int vfs_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
1463 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1464 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*);
1465 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1466 extern int vfs_unlink(struct inode
*, struct dentry
*);
1467 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
1470 * VFS dentry helper functions.
1472 extern void dentry_unhash(struct dentry
*dentry
);
1475 * VFS file helper functions.
1477 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1480 * VFS FS_IOC_FIEMAP helper definitions.
1482 struct fiemap_extent_info
{
1483 unsigned int fi_flags
; /* Flags as passed from user */
1484 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1485 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1486 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1487 fiemap_extent array */
1489 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1490 u64 phys
, u64 len
, u32 flags
);
1491 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1496 * NOTE! These match bits 12..15 of stat.st_mode
1497 * (ie "(i_mode >> 12) & 15").
1499 #define DT_UNKNOWN 0
1510 * This is the "filldir" function type, used by readdir() to let
1511 * the kernel specify what kind of dirent layout it wants to have.
1512 * This allows the kernel to read directories into kernel space or
1513 * to have different dirent layouts depending on the binary type.
1515 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1516 struct block_device_operations
;
1518 /* These macros are for out of kernel modules to test that
1519 * the kernel supports the unlocked_ioctl and compat_ioctl
1520 * fields in struct file_operations. */
1521 #define HAVE_COMPAT_IOCTL 1
1522 #define HAVE_UNLOCKED_IOCTL 1
1524 struct file_operations
{
1525 struct module
*owner
;
1526 loff_t (*llseek
) (struct file
*, loff_t
, int);
1527 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1528 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1529 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1530 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1531 int (*readdir
) (struct file
*, void *, filldir_t
);
1532 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1533 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1534 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1535 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1536 int (*open
) (struct inode
*, struct file
*);
1537 int (*flush
) (struct file
*, fl_owner_t id
);
1538 int (*release
) (struct inode
*, struct file
*);
1539 int (*fsync
) (struct file
*, loff_t
, loff_t
, int datasync
);
1540 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1541 int (*fasync
) (int, struct file
*, int);
1542 int (*lock
) (struct file
*, int, struct file_lock
*);
1543 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1544 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1545 int (*check_flags
)(int);
1546 int (*flock
) (struct file
*, int, struct file_lock
*);
1547 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1548 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1549 int (*setlease
)(struct file
*, long, struct file_lock
**);
1550 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1554 struct inode_operations
{
1555 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, unsigned int);
1556 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1557 int (*permission
) (struct inode
*, int);
1558 struct posix_acl
* (*get_acl
)(struct inode
*, int);
1560 int (*readlink
) (struct dentry
*, char __user
*,int);
1561 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1563 int (*create
) (struct inode
*,struct dentry
*, umode_t
, bool);
1564 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1565 int (*unlink
) (struct inode
*,struct dentry
*);
1566 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1567 int (*mkdir
) (struct inode
*,struct dentry
*,umode_t
);
1568 int (*rmdir
) (struct inode
*,struct dentry
*);
1569 int (*mknod
) (struct inode
*,struct dentry
*,umode_t
,dev_t
);
1570 int (*rename
) (struct inode
*, struct dentry
*,
1571 struct inode
*, struct dentry
*);
1572 void (*truncate
) (struct inode
*);
1573 int (*setattr
) (struct dentry
*, struct iattr
*);
1574 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1575 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1576 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1577 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1578 int (*removexattr
) (struct dentry
*, const char *);
1579 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1581 int (*update_time
)(struct inode
*, struct timespec
*, int);
1582 int (*atomic_open
)(struct inode
*, struct dentry
*,
1583 struct file
*, unsigned open_flag
,
1584 umode_t create_mode
, int *opened
);
1585 } ____cacheline_aligned
;
1589 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1590 unsigned long nr_segs
, unsigned long fast_segs
,
1591 struct iovec
*fast_pointer
,
1592 struct iovec
**ret_pointer
);
1594 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1595 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1596 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1597 unsigned long, loff_t
*);
1598 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1599 unsigned long, loff_t
*);
1601 struct super_operations
{
1602 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1603 void (*destroy_inode
)(struct inode
*);
1605 void (*dirty_inode
) (struct inode
*, int flags
);
1606 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1607 int (*drop_inode
) (struct inode
*);
1608 void (*evict_inode
) (struct inode
*);
1609 void (*put_super
) (struct super_block
*);
1610 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1611 int (*freeze_fs
) (struct super_block
*);
1612 int (*unfreeze_fs
) (struct super_block
*);
1613 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1614 int (*remount_fs
) (struct super_block
*, int *, char *);
1615 void (*umount_begin
) (struct super_block
*);
1617 int (*show_options
)(struct seq_file
*, struct dentry
*);
1618 int (*show_devname
)(struct seq_file
*, struct dentry
*);
1619 int (*show_path
)(struct seq_file
*, struct dentry
*);
1620 int (*show_stats
)(struct seq_file
*, struct dentry
*);
1622 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1623 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1625 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1626 int (*nr_cached_objects
)(struct super_block
*);
1627 void (*free_cached_objects
)(struct super_block
*, int);
1631 * Inode flags - they have no relation to superblock flags now
1633 #define S_SYNC 1 /* Writes are synced at once */
1634 #define S_NOATIME 2 /* Do not update access times */
1635 #define S_APPEND 4 /* Append-only file */
1636 #define S_IMMUTABLE 8 /* Immutable file */
1637 #define S_DEAD 16 /* removed, but still open directory */
1638 #define S_NOQUOTA 32 /* Inode is not counted to quota */
1639 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
1640 #define S_NOCMTIME 128 /* Do not update file c/mtime */
1641 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
1642 #define S_PRIVATE 512 /* Inode is fs-internal */
1643 #define S_IMA 1024 /* Inode has an associated IMA struct */
1644 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
1645 #define S_NOSEC 4096 /* no suid or xattr security attributes */
1648 * Note that nosuid etc flags are inode-specific: setting some file-system
1649 * flags just means all the inodes inherit those flags by default. It might be
1650 * possible to override it selectively if you really wanted to with some
1651 * ioctl() that is not currently implemented.
1653 * Exception: MS_RDONLY is always applied to the entire file system.
1655 * Unfortunately, it is possible to change a filesystems flags with it mounted
1656 * with files in use. This means that all of the inodes will not have their
1657 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
1658 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
1660 #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg))
1662 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
1663 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
1664 ((inode)->i_flags & S_SYNC))
1665 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
1666 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
1667 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
1668 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
1669 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
1671 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
1672 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
1673 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
1674 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
1676 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
1677 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
1678 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
1679 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
1680 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
1681 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
1682 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
1685 * Inode state bits. Protected by inode->i_lock
1687 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1688 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1690 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1691 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1692 * various stages of removing an inode.
1694 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1696 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1697 * fdatasync(). i_atime is the usual cause.
1698 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1699 * these changes separately from I_DIRTY_SYNC so that we
1700 * don't have to write inode on fdatasync() when only
1701 * mtime has changed in it.
1702 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1703 * I_NEW Serves as both a mutex and completion notification.
1704 * New inodes set I_NEW. If two processes both create
1705 * the same inode, one of them will release its inode and
1706 * wait for I_NEW to be released before returning.
1707 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1708 * also cause waiting on I_NEW, without I_NEW actually
1709 * being set. find_inode() uses this to prevent returning
1710 * nearly-dead inodes.
1711 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1712 * is zero. I_FREEING must be set when I_WILL_FREE is
1714 * I_FREEING Set when inode is about to be freed but still has dirty
1715 * pages or buffers attached or the inode itself is still
1717 * I_CLEAR Added by clear_inode(). In this state the inode is
1718 * clean and can be destroyed. Inode keeps I_FREEING.
1720 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1721 * prohibited for many purposes. iget() must wait for
1722 * the inode to be completely released, then create it
1723 * anew. Other functions will just ignore such inodes,
1724 * if appropriate. I_NEW is used for waiting.
1726 * I_SYNC Writeback of inode is running. The bit is set during
1727 * data writeback, and cleared with a wakeup on the bit
1728 * address once it is done. The bit is also used to pin
1729 * the inode in memory for flusher thread.
1731 * I_REFERENCED Marks the inode as recently references on the LRU list.
1733 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1735 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1737 #define I_DIRTY_SYNC (1 << 0)
1738 #define I_DIRTY_DATASYNC (1 << 1)
1739 #define I_DIRTY_PAGES (1 << 2)
1741 #define I_NEW (1 << __I_NEW)
1742 #define I_WILL_FREE (1 << 4)
1743 #define I_FREEING (1 << 5)
1744 #define I_CLEAR (1 << 6)
1746 #define I_SYNC (1 << __I_SYNC)
1747 #define I_REFERENCED (1 << 8)
1748 #define __I_DIO_WAKEUP 9
1749 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1751 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1753 extern void __mark_inode_dirty(struct inode
*, int);
1754 static inline void mark_inode_dirty(struct inode
*inode
)
1756 __mark_inode_dirty(inode
, I_DIRTY
);
1759 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1761 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1764 extern void inc_nlink(struct inode
*inode
);
1765 extern void drop_nlink(struct inode
*inode
);
1766 extern void clear_nlink(struct inode
*inode
);
1767 extern void set_nlink(struct inode
*inode
, unsigned int nlink
);
1769 static inline void inode_inc_link_count(struct inode
*inode
)
1772 mark_inode_dirty(inode
);
1775 static inline void inode_dec_link_count(struct inode
*inode
)
1778 mark_inode_dirty(inode
);
1782 * inode_inc_iversion - increments i_version
1783 * @inode: inode that need to be updated
1785 * Every time the inode is modified, the i_version field will be incremented.
1786 * The filesystem has to be mounted with i_version flag
1789 static inline void inode_inc_iversion(struct inode
*inode
)
1791 spin_lock(&inode
->i_lock
);
1793 spin_unlock(&inode
->i_lock
);
1796 enum file_time_flags
{
1803 extern void touch_atime(struct path
*);
1804 static inline void file_accessed(struct file
*file
)
1806 if (!(file
->f_flags
& O_NOATIME
))
1807 touch_atime(&file
->f_path
);
1810 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1811 int sync_inode_metadata(struct inode
*inode
, int wait
);
1813 struct file_system_type
{
1816 #define FS_REQUIRES_DEV 1
1817 #define FS_BINARY_MOUNTDATA 2
1818 #define FS_HAS_SUBTYPE 4
1819 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
1820 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */
1821 struct dentry
*(*mount
) (struct file_system_type
*, int,
1822 const char *, void *);
1823 void (*kill_sb
) (struct super_block
*);
1824 struct module
*owner
;
1825 struct file_system_type
* next
;
1826 struct hlist_head fs_supers
;
1828 struct lock_class_key s_lock_key
;
1829 struct lock_class_key s_umount_key
;
1830 struct lock_class_key s_vfs_rename_key
;
1831 struct lock_class_key s_writers_key
[SB_FREEZE_LEVELS
];
1833 struct lock_class_key i_lock_key
;
1834 struct lock_class_key i_mutex_key
;
1835 struct lock_class_key i_mutex_dir_key
;
1838 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
, int flags
,
1839 void *data
, int (*fill_super
)(struct super_block
*, void *, int));
1840 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
1841 int flags
, const char *dev_name
, void *data
,
1842 int (*fill_super
)(struct super_block
*, void *, int));
1843 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
1844 int flags
, void *data
,
1845 int (*fill_super
)(struct super_block
*, void *, int));
1846 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
1847 int flags
, void *data
,
1848 int (*fill_super
)(struct super_block
*, void *, int));
1849 extern struct dentry
*mount_subtree(struct vfsmount
*mnt
, const char *path
);
1850 void generic_shutdown_super(struct super_block
*sb
);
1851 void kill_block_super(struct super_block
*sb
);
1852 void kill_anon_super(struct super_block
*sb
);
1853 void kill_litter_super(struct super_block
*sb
);
1854 void deactivate_super(struct super_block
*sb
);
1855 void deactivate_locked_super(struct super_block
*sb
);
1856 int set_anon_super(struct super_block
*s
, void *data
);
1857 int get_anon_bdev(dev_t
*);
1858 void free_anon_bdev(dev_t
);
1859 struct super_block
*sget(struct file_system_type
*type
,
1860 int (*test
)(struct super_block
*,void *),
1861 int (*set
)(struct super_block
*,void *),
1862 int flags
, void *data
);
1863 extern struct dentry
*mount_pseudo(struct file_system_type
*, char *,
1864 const struct super_operations
*ops
,
1865 const struct dentry_operations
*dops
,
1868 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1869 #define fops_get(fops) \
1870 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1871 #define fops_put(fops) \
1872 do { if (fops) module_put((fops)->owner); } while(0)
1874 extern int register_filesystem(struct file_system_type
*);
1875 extern int unregister_filesystem(struct file_system_type
*);
1876 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
1877 #define kern_mount(type) kern_mount_data(type, NULL)
1878 extern void kern_unmount(struct vfsmount
*mnt
);
1879 extern int may_umount_tree(struct vfsmount
*);
1880 extern int may_umount(struct vfsmount
*);
1881 extern long do_mount(const char *, const char *, const char *, unsigned long, void *);
1882 extern struct vfsmount
*collect_mounts(struct path
*);
1883 extern void drop_collected_mounts(struct vfsmount
*);
1884 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
1886 extern int vfs_statfs(struct path
*, struct kstatfs
*);
1887 extern int user_statfs(const char __user
*, struct kstatfs
*);
1888 extern int fd_statfs(int, struct kstatfs
*);
1889 extern int vfs_ustat(dev_t
, struct kstatfs
*);
1890 extern int freeze_super(struct super_block
*super
);
1891 extern int thaw_super(struct super_block
*super
);
1892 extern bool our_mnt(struct vfsmount
*mnt
);
1894 extern int current_umask(void);
1897 extern struct kobject
*fs_kobj
;
1899 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1900 extern int rw_verify_area(int, struct file
*, loff_t
*, size_t);
1902 #define FLOCK_VERIFY_READ 1
1903 #define FLOCK_VERIFY_WRITE 2
1905 #ifdef CONFIG_FILE_LOCKING
1906 extern int locks_mandatory_locked(struct inode
*);
1907 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1910 * Candidates for mandatory locking have the setgid bit set
1911 * but no group execute bit - an otherwise meaningless combination.
1914 static inline int __mandatory_lock(struct inode
*ino
)
1916 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
1920 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1921 * otherwise these will be advisory locks
1924 static inline int mandatory_lock(struct inode
*ino
)
1926 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
1929 static inline int locks_verify_locked(struct inode
*inode
)
1931 if (mandatory_lock(inode
))
1932 return locks_mandatory_locked(inode
);
1936 static inline int locks_verify_truncate(struct inode
*inode
,
1940 if (inode
->i_flock
&& mandatory_lock(inode
))
1941 return locks_mandatory_area(
1942 FLOCK_VERIFY_WRITE
, inode
, filp
,
1943 size
< inode
->i_size
? size
: inode
->i_size
,
1944 (size
< inode
->i_size
? inode
->i_size
- size
1945 : size
- inode
->i_size
)
1950 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1953 return __break_lease(inode
, mode
);
1956 #else /* !CONFIG_FILE_LOCKING */
1957 static inline int locks_mandatory_locked(struct inode
*inode
)
1962 static inline int locks_mandatory_area(int rw
, struct inode
*inode
,
1963 struct file
*filp
, loff_t offset
,
1969 static inline int __mandatory_lock(struct inode
*inode
)
1974 static inline int mandatory_lock(struct inode
*inode
)
1979 static inline int locks_verify_locked(struct inode
*inode
)
1984 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
1990 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1995 #endif /* CONFIG_FILE_LOCKING */
2000 const char *name
; /* pointer to actual string */
2001 const __user
char *uptr
; /* original userland pointer */
2002 struct audit_names
*aname
;
2003 bool separate
; /* should "name" be freed? */
2006 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
2008 extern int do_fallocate(struct file
*file
, int mode
, loff_t offset
,
2010 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
2012 extern struct file
*file_open_name(struct filename
*, int, umode_t
);
2013 extern struct file
*filp_open(const char *, int, umode_t
);
2014 extern struct file
*file_open_root(struct dentry
*, struct vfsmount
*,
2016 extern struct file
* dentry_open(const struct path
*, int, const struct cred
*);
2017 extern int filp_close(struct file
*, fl_owner_t id
);
2019 extern struct filename
*getname(const char __user
*);
2025 extern int finish_open(struct file
*file
, struct dentry
*dentry
,
2026 int (*open
)(struct inode
*, struct file
*),
2028 extern int finish_no_open(struct file
*file
, struct dentry
*dentry
);
2032 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
2035 extern void __init
vfs_caches_init_early(void);
2036 extern void __init
vfs_caches_init(unsigned long);
2038 extern struct kmem_cache
*names_cachep
;
2040 extern void final_putname(struct filename
*name
);
2042 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
2043 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2044 #ifndef CONFIG_AUDITSYSCALL
2045 #define putname(name) final_putname(name)
2047 extern void putname(struct filename
*name
);
2051 extern int register_blkdev(unsigned int, const char *);
2052 extern void unregister_blkdev(unsigned int, const char *);
2053 extern struct block_device
*bdget(dev_t
);
2054 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2055 extern void bd_set_size(struct block_device
*, loff_t size
);
2056 extern sector_t
blkdev_max_block(struct block_device
*bdev
);
2057 extern void bd_forget(struct inode
*inode
);
2058 extern void bdput(struct block_device
*);
2059 extern void invalidate_bdev(struct block_device
*);
2060 extern void iterate_bdevs(void (*)(struct block_device
*, void *), void *);
2061 extern int sync_blockdev(struct block_device
*bdev
);
2062 extern void kill_bdev(struct block_device
*);
2063 extern struct super_block
*freeze_bdev(struct block_device
*);
2064 extern void emergency_thaw_all(void);
2065 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2066 extern int fsync_bdev(struct block_device
*);
2068 static inline void bd_forget(struct inode
*inode
) {}
2069 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2070 static inline void kill_bdev(struct block_device
*bdev
) {}
2071 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2073 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2078 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2083 static inline void iterate_bdevs(void (*f
)(struct block_device
*, void *), void *arg
)
2087 extern int sync_filesystem(struct super_block
*);
2088 extern const struct file_operations def_blk_fops
;
2089 extern const struct file_operations def_chr_fops
;
2090 extern const struct file_operations bad_sock_fops
;
2091 extern const struct file_operations def_fifo_fops
;
2093 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2094 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2095 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2096 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2097 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2099 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2101 extern int blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2103 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2104 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2105 struct gendisk
*disk
);
2107 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2108 struct gendisk
*disk
)
2112 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2113 struct gendisk
*disk
)
2120 #define CHRDEV_MAJOR_HASH_SIZE 255
2121 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2122 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2123 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2124 unsigned int count
, const char *name
,
2125 const struct file_operations
*fops
);
2126 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2127 unsigned int count
, const char *name
);
2128 extern void unregister_chrdev_region(dev_t
, unsigned);
2129 extern void chrdev_show(struct seq_file
*,off_t
);
2131 static inline int register_chrdev(unsigned int major
, const char *name
,
2132 const struct file_operations
*fops
)
2134 return __register_chrdev(major
, 0, 256, name
, fops
);
2137 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2139 __unregister_chrdev(major
, 0, 256, name
);
2142 /* fs/block_dev.c */
2143 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2144 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2147 #define BLKDEV_MAJOR_HASH_SIZE 255
2148 extern const char *__bdevname(dev_t
, char *buffer
);
2149 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2150 extern struct block_device
*lookup_bdev(const char *);
2151 extern void blkdev_show(struct seq_file
*,off_t
);
2154 #define BLKDEV_MAJOR_HASH_SIZE 0
2157 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2159 /* Invalid inode operations -- fs/bad_inode.c */
2160 extern void make_bad_inode(struct inode
*);
2161 extern int is_bad_inode(struct inode
*);
2163 extern const struct file_operations read_pipefifo_fops
;
2164 extern const struct file_operations write_pipefifo_fops
;
2165 extern const struct file_operations rdwr_pipefifo_fops
;
2169 * return READ, READA, or WRITE
2171 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2174 * return data direction, READ or WRITE
2176 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2178 extern void check_disk_size_change(struct gendisk
*disk
,
2179 struct block_device
*bdev
);
2180 extern int revalidate_disk(struct gendisk
*);
2181 extern int check_disk_change(struct block_device
*);
2182 extern int __invalidate_device(struct block_device
*, bool);
2183 extern int invalidate_partition(struct gendisk
*, int);
2185 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2186 pgoff_t start
, pgoff_t end
);
2188 static inline void invalidate_remote_inode(struct inode
*inode
)
2190 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2191 S_ISLNK(inode
->i_mode
))
2192 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2194 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2195 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2196 pgoff_t start
, pgoff_t end
);
2197 extern int write_inode_now(struct inode
*, int);
2198 extern int filemap_fdatawrite(struct address_space
*);
2199 extern int filemap_flush(struct address_space
*);
2200 extern int filemap_fdatawait(struct address_space
*);
2201 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2203 extern int filemap_write_and_wait(struct address_space
*mapping
);
2204 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2205 loff_t lstart
, loff_t lend
);
2206 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2207 loff_t start
, loff_t end
, int sync_mode
);
2208 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2209 loff_t start
, loff_t end
);
2211 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2213 extern int vfs_fsync(struct file
*file
, int datasync
);
2214 extern int generic_write_sync(struct file
*file
, loff_t pos
, loff_t count
);
2215 extern void emergency_sync(void);
2216 extern void emergency_remount(void);
2218 extern sector_t
bmap(struct inode
*, sector_t
);
2220 extern int notify_change(struct dentry
*, struct iattr
*);
2221 extern int inode_permission(struct inode
*, int);
2222 extern int generic_permission(struct inode
*, int);
2224 static inline bool execute_ok(struct inode
*inode
)
2226 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2230 * get_write_access() gets write permission for a file.
2231 * put_write_access() releases this write permission.
2232 * This is used for regular files.
2233 * We cannot support write (and maybe mmap read-write shared) accesses and
2234 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2235 * can have the following values:
2236 * 0: no writers, no VM_DENYWRITE mappings
2237 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2238 * > 0: (i_writecount) users are writing to the file.
2240 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2241 * except for the cases where we don't hold i_writecount yet. Then we need to
2242 * use {get,deny}_write_access() - these functions check the sign and refuse
2243 * to do the change if sign is wrong.
2245 static inline int get_write_access(struct inode
*inode
)
2247 return atomic_inc_unless_negative(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2249 static inline int deny_write_access(struct file
*file
)
2251 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2252 return atomic_dec_unless_positive(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2254 static inline void put_write_access(struct inode
* inode
)
2256 atomic_dec(&inode
->i_writecount
);
2258 static inline void allow_write_access(struct file
*file
)
2261 atomic_inc(&file
->f_path
.dentry
->d_inode
->i_writecount
);
2264 static inline void i_readcount_dec(struct inode
*inode
)
2266 BUG_ON(!atomic_read(&inode
->i_readcount
));
2267 atomic_dec(&inode
->i_readcount
);
2269 static inline void i_readcount_inc(struct inode
*inode
)
2271 atomic_inc(&inode
->i_readcount
);
2274 static inline void i_readcount_dec(struct inode
*inode
)
2278 static inline void i_readcount_inc(struct inode
*inode
)
2283 extern int do_pipe_flags(int *, int);
2285 extern int kernel_read(struct file
*, loff_t
, char *, unsigned long);
2286 extern struct file
* open_exec(const char *);
2288 /* fs/dcache.c -- generic fs support functions */
2289 extern int is_subdir(struct dentry
*, struct dentry
*);
2290 extern int path_is_under(struct path
*, struct path
*);
2291 extern ino_t
find_inode_number(struct dentry
*, struct qstr
*);
2293 #include <linux/err.h>
2295 /* needed for stackable file system support */
2296 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int origin
);
2298 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int origin
);
2300 extern int inode_init_always(struct super_block
*, struct inode
*);
2301 extern void inode_init_once(struct inode
*);
2302 extern void address_space_init_once(struct address_space
*mapping
);
2303 extern void ihold(struct inode
* inode
);
2304 extern void iput(struct inode
*);
2305 extern struct inode
* igrab(struct inode
*);
2306 extern ino_t
iunique(struct super_block
*, ino_t
);
2307 extern int inode_needs_sync(struct inode
*inode
);
2308 extern int generic_delete_inode(struct inode
*inode
);
2309 static inline int generic_drop_inode(struct inode
*inode
)
2311 return !inode
->i_nlink
|| inode_unhashed(inode
);
2314 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2315 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2317 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2318 int (*test
)(struct inode
*, void *), void *data
);
2319 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2321 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2322 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2323 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2324 extern int insert_inode_locked(struct inode
*);
2325 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2326 extern void lockdep_annotate_inode_mutex_key(struct inode
*inode
);
2328 static inline void lockdep_annotate_inode_mutex_key(struct inode
*inode
) { };
2330 extern void unlock_new_inode(struct inode
*);
2331 extern unsigned int get_next_ino(void);
2333 extern void __iget(struct inode
* inode
);
2334 extern void iget_failed(struct inode
*);
2335 extern void clear_inode(struct inode
*);
2336 extern void __destroy_inode(struct inode
*);
2337 extern struct inode
*new_inode_pseudo(struct super_block
*sb
);
2338 extern struct inode
*new_inode(struct super_block
*sb
);
2339 extern void free_inode_nonrcu(struct inode
*inode
);
2340 extern int should_remove_suid(struct dentry
*);
2341 extern int file_remove_suid(struct file
*);
2343 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2344 static inline void insert_inode_hash(struct inode
*inode
)
2346 __insert_inode_hash(inode
, inode
->i_ino
);
2349 extern void __remove_inode_hash(struct inode
*);
2350 static inline void remove_inode_hash(struct inode
*inode
)
2352 if (!inode_unhashed(inode
))
2353 __remove_inode_hash(inode
);
2356 extern void inode_sb_list_add(struct inode
*inode
);
2359 extern void submit_bio(int, struct bio
*);
2360 extern int bdev_read_only(struct block_device
*);
2362 extern int set_blocksize(struct block_device
*, int);
2363 extern int sb_set_blocksize(struct super_block
*, int);
2364 extern int sb_min_blocksize(struct super_block
*, int);
2366 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2367 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2368 extern int generic_file_remap_pages(struct vm_area_struct
*, unsigned long addr
,
2369 unsigned long size
, pgoff_t pgoff
);
2370 extern int file_read_actor(read_descriptor_t
* desc
, struct page
*page
, unsigned long offset
, unsigned long size
);
2371 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
2372 extern ssize_t
generic_file_aio_read(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2373 extern ssize_t
__generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long,
2375 extern ssize_t
generic_file_aio_write(struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
2376 extern ssize_t
generic_file_direct_write(struct kiocb
*, const struct iovec
*,
2377 unsigned long *, loff_t
, loff_t
*, size_t, size_t);
2378 extern ssize_t
generic_file_buffered_write(struct kiocb
*, const struct iovec
*,
2379 unsigned long, loff_t
, loff_t
*, size_t, ssize_t
);
2380 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2381 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2382 extern int generic_segment_checks(const struct iovec
*iov
,
2383 unsigned long *nr_segs
, size_t *count
, int access_flags
);
2385 /* fs/block_dev.c */
2386 extern ssize_t
blkdev_aio_read(struct kiocb
*iocb
, const struct iovec
*iov
,
2387 unsigned long nr_segs
, loff_t pos
);
2388 extern ssize_t
blkdev_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
2389 unsigned long nr_segs
, loff_t pos
);
2390 extern int blkdev_fsync(struct file
*filp
, loff_t start
, loff_t end
,
2392 extern void block_sync_page(struct page
*page
);
2395 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
2396 struct pipe_inode_info
*, size_t, unsigned int);
2397 extern ssize_t
default_file_splice_read(struct file
*, loff_t
*,
2398 struct pipe_inode_info
*, size_t, unsigned int);
2399 extern ssize_t
generic_file_splice_write(struct pipe_inode_info
*,
2400 struct file
*, loff_t
*, size_t, unsigned int);
2401 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
2402 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
2403 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
2404 size_t len
, unsigned int flags
);
2407 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
2408 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int origin
);
2409 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int origin
);
2410 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int origin
);
2411 extern loff_t
generic_file_llseek_size(struct file
*file
, loff_t offset
,
2412 int origin
, loff_t maxsize
, loff_t eof
);
2413 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
2414 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
2416 #ifdef CONFIG_FS_XIP
2417 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
2419 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
2420 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
2421 size_t len
, loff_t
*ppos
);
2422 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
2424 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
2431 typedef void (dio_submit_t
)(int rw
, struct bio
*bio
, struct inode
*inode
,
2432 loff_t file_offset
);
2435 /* need locking between buffered and direct access */
2438 /* filesystem does not support filling holes */
2439 DIO_SKIP_HOLES
= 0x02,
2442 void dio_end_io(struct bio
*bio
, int error
);
2444 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
2445 struct block_device
*bdev
, const struct iovec
*iov
, loff_t offset
,
2446 unsigned long nr_segs
, get_block_t get_block
, dio_iodone_t end_io
,
2447 dio_submit_t submit_io
, int flags
);
2449 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2450 struct inode
*inode
, const struct iovec
*iov
, loff_t offset
,
2451 unsigned long nr_segs
, get_block_t get_block
)
2453 return __blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
2454 offset
, nr_segs
, get_block
, NULL
, NULL
,
2455 DIO_LOCKING
| DIO_SKIP_HOLES
);
2459 void inode_dio_wait(struct inode
*inode
);
2460 void inode_dio_done(struct inode
*inode
);
2462 extern const struct file_operations generic_ro_fops
;
2464 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2466 extern int vfs_readlink(struct dentry
*, char __user
*, int, const char *);
2467 extern int vfs_follow_link(struct nameidata
*, const char *);
2468 extern int page_readlink(struct dentry
*, char __user
*, int);
2469 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2470 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2471 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2473 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2474 extern const struct inode_operations page_symlink_inode_operations
;
2475 extern int generic_readlink(struct dentry
*, char __user
*, int);
2476 extern void generic_fillattr(struct inode
*, struct kstat
*);
2477 extern int vfs_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2478 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2479 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2480 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2481 loff_t
inode_get_bytes(struct inode
*inode
);
2482 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2484 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2486 extern int vfs_stat(const char __user
*, struct kstat
*);
2487 extern int vfs_lstat(const char __user
*, struct kstat
*);
2488 extern int vfs_fstat(unsigned int, struct kstat
*);
2489 extern int vfs_fstatat(int , const char __user
*, struct kstat
*, int);
2491 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2493 extern int __generic_block_fiemap(struct inode
*inode
,
2494 struct fiemap_extent_info
*fieinfo
,
2495 loff_t start
, loff_t len
,
2496 get_block_t
*get_block
);
2497 extern int generic_block_fiemap(struct inode
*inode
,
2498 struct fiemap_extent_info
*fieinfo
, u64 start
,
2499 u64 len
, get_block_t
*get_block
);
2501 extern void get_filesystem(struct file_system_type
*fs
);
2502 extern void put_filesystem(struct file_system_type
*fs
);
2503 extern struct file_system_type
*get_fs_type(const char *name
);
2504 extern struct super_block
*get_super(struct block_device
*);
2505 extern struct super_block
*get_super_thawed(struct block_device
*);
2506 extern struct super_block
*get_active_super(struct block_device
*bdev
);
2507 extern void drop_super(struct super_block
*sb
);
2508 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
2509 extern void iterate_supers_type(struct file_system_type
*,
2510 void (*)(struct super_block
*, void *), void *);
2512 extern int dcache_dir_open(struct inode
*, struct file
*);
2513 extern int dcache_dir_close(struct inode
*, struct file
*);
2514 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2515 extern int dcache_readdir(struct file
*, void *, filldir_t
);
2516 extern int simple_setattr(struct dentry
*, struct iattr
*);
2517 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2518 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2519 extern int simple_open(struct inode
*inode
, struct file
*file
);
2520 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2521 extern int simple_unlink(struct inode
*, struct dentry
*);
2522 extern int simple_rmdir(struct inode
*, struct dentry
*);
2523 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2524 extern int noop_fsync(struct file
*, loff_t
, loff_t
, int);
2525 extern int simple_empty(struct dentry
*);
2526 extern int simple_readpage(struct file
*file
, struct page
*page
);
2527 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2528 loff_t pos
, unsigned len
, unsigned flags
,
2529 struct page
**pagep
, void **fsdata
);
2530 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2531 loff_t pos
, unsigned len
, unsigned copied
,
2532 struct page
*page
, void *fsdata
);
2534 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, unsigned int flags
);
2535 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2536 extern const struct file_operations simple_dir_operations
;
2537 extern const struct inode_operations simple_dir_inode_operations
;
2538 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2539 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2540 extern int simple_fill_super(struct super_block
*, unsigned long, struct tree_descr
*);
2541 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2542 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2544 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2545 loff_t
*ppos
, const void *from
, size_t available
);
2546 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
2547 const void __user
*from
, size_t count
);
2549 extern int generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2551 extern int generic_check_addressable(unsigned, u64
);
2553 #ifdef CONFIG_MIGRATION
2554 extern int buffer_migrate_page(struct address_space
*,
2555 struct page
*, struct page
*,
2558 #define buffer_migrate_page NULL
2561 extern int inode_change_ok(const struct inode
*, struct iattr
*);
2562 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
2563 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
2565 extern int file_update_time(struct file
*file
);
2567 extern int generic_show_options(struct seq_file
*m
, struct dentry
*root
);
2568 extern void save_mount_options(struct super_block
*sb
, char *options
);
2569 extern void replace_mount_options(struct super_block
*sb
, char *options
);
2571 static inline ino_t
parent_ino(struct dentry
*dentry
)
2576 * Don't strictly need d_lock here? If the parent ino could change
2577 * then surely we'd have a deeper race in the caller?
2579 spin_lock(&dentry
->d_lock
);
2580 res
= dentry
->d_parent
->d_inode
->i_ino
;
2581 spin_unlock(&dentry
->d_lock
);
2585 /* Transaction based IO helpers */
2588 * An argresp is stored in an allocated page and holds the
2589 * size of the argument or response, along with its content
2591 struct simple_transaction_argresp
{
2596 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2598 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2600 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2601 size_t size
, loff_t
*pos
);
2602 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2604 void simple_transaction_set(struct file
*file
, size_t n
);
2607 * simple attribute files
2609 * These attributes behave similar to those in sysfs:
2611 * Writing to an attribute immediately sets a value, an open file can be
2612 * written to multiple times.
2614 * Reading from an attribute creates a buffer from the value that might get
2615 * read with multiple read calls. When the attribute has been read
2616 * completely, no further read calls are possible until the file is opened
2619 * All attributes contain a text representation of a numeric value
2620 * that are accessed with the get() and set() functions.
2622 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2623 static int __fops ## _open(struct inode *inode, struct file *file) \
2625 __simple_attr_check_format(__fmt, 0ull); \
2626 return simple_attr_open(inode, file, __get, __set, __fmt); \
2628 static const struct file_operations __fops = { \
2629 .owner = THIS_MODULE, \
2630 .open = __fops ## _open, \
2631 .release = simple_attr_release, \
2632 .read = simple_attr_read, \
2633 .write = simple_attr_write, \
2634 .llseek = generic_file_llseek, \
2637 static inline __printf(1, 2)
2638 void __simple_attr_check_format(const char *fmt
, ...)
2640 /* don't do anything, just let the compiler check the arguments; */
2643 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2644 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2646 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2647 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2648 size_t len
, loff_t
*ppos
);
2649 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2650 size_t len
, loff_t
*ppos
);
2653 int proc_nr_files(struct ctl_table
*table
, int write
,
2654 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2655 int proc_nr_dentry(struct ctl_table
*table
, int write
,
2656 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2657 int proc_nr_inodes(struct ctl_table
*table
, int write
,
2658 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2659 int __init
get_filesystem_list(char *buf
);
2661 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2662 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2664 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2665 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2666 (flag & __FMODE_NONOTIFY)))
2668 static inline int is_sxid(umode_t mode
)
2670 return (mode
& S_ISUID
) || ((mode
& S_ISGID
) && (mode
& S_IXGRP
));
2673 static inline void inode_has_no_xattr(struct inode
*inode
)
2675 if (!is_sxid(inode
->i_mode
) && (inode
->i_sb
->s_flags
& MS_NOSEC
))
2676 inode
->i_flags
|= S_NOSEC
;
2679 #endif /* _LINUX_FS_H */