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/list_lru.h>
14 #include <linux/llist.h>
15 #include <linux/radix-tree.h>
16 #include <linux/rbtree.h>
17 #include <linux/init.h>
18 #include <linux/pid.h>
19 #include <linux/bug.h>
20 #include <linux/mutex.h>
21 #include <linux/capability.h>
22 #include <linux/semaphore.h>
23 #include <linux/fiemap.h>
24 #include <linux/rculist_bl.h>
25 #include <linux/atomic.h>
26 #include <linux/shrinker.h>
27 #include <linux/migrate_mode.h>
28 #include <linux/uidgid.h>
29 #include <linux/lockdep.h>
30 #include <linux/percpu-rwsem.h>
31 #include <linux/blk_types.h>
33 #include <asm/byteorder.h>
34 #include <uapi/linux/fs.h>
36 struct export_operations
;
42 struct pipe_inode_info
;
43 struct poll_table_struct
;
45 struct vm_area_struct
;
48 struct swap_info_struct
;
50 struct workqueue_struct
;
53 extern void __init
inode_init(void);
54 extern void __init
inode_init_early(void);
55 extern void __init
files_init(unsigned long);
57 extern struct files_stat_struct files_stat
;
58 extern unsigned long get_max_files(void);
59 extern int sysctl_nr_open
;
60 extern struct inodes_stat_t inodes_stat
;
61 extern int leases_enable
, lease_break_time
;
62 extern int sysctl_protected_symlinks
;
63 extern int sysctl_protected_hardlinks
;
66 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
67 struct buffer_head
*bh_result
, int create
);
68 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
69 ssize_t bytes
, void *private);
71 #define MAY_EXEC 0x00000001
72 #define MAY_WRITE 0x00000002
73 #define MAY_READ 0x00000004
74 #define MAY_APPEND 0x00000008
75 #define MAY_ACCESS 0x00000010
76 #define MAY_OPEN 0x00000020
77 #define MAY_CHDIR 0x00000040
78 /* called from RCU mode, don't block */
79 #define MAY_NOT_BLOCK 0x00000080
82 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
83 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
86 /* file is open for reading */
87 #define FMODE_READ ((__force fmode_t)0x1)
88 /* file is open for writing */
89 #define FMODE_WRITE ((__force fmode_t)0x2)
90 /* file is seekable */
91 #define FMODE_LSEEK ((__force fmode_t)0x4)
92 /* file can be accessed using pread */
93 #define FMODE_PREAD ((__force fmode_t)0x8)
94 /* file can be accessed using pwrite */
95 #define FMODE_PWRITE ((__force fmode_t)0x10)
96 /* File is opened for execution with sys_execve / sys_uselib */
97 #define FMODE_EXEC ((__force fmode_t)0x20)
98 /* File is opened with O_NDELAY (only set for block devices) */
99 #define FMODE_NDELAY ((__force fmode_t)0x40)
100 /* File is opened with O_EXCL (only set for block devices) */
101 #define FMODE_EXCL ((__force fmode_t)0x80)
102 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
103 (specialy hack for floppy.c) */
104 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
105 /* 32bit hashes as llseek() offset (for directories) */
106 #define FMODE_32BITHASH ((__force fmode_t)0x200)
107 /* 64bit hashes as llseek() offset (for directories) */
108 #define FMODE_64BITHASH ((__force fmode_t)0x400)
111 * Don't update ctime and mtime.
113 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
114 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
116 #define FMODE_NOCMTIME ((__force fmode_t)0x800)
118 /* Expect random access pattern */
119 #define FMODE_RANDOM ((__force fmode_t)0x1000)
121 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
122 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
124 /* File is opened with O_PATH; almost nothing can be done with it */
125 #define FMODE_PATH ((__force fmode_t)0x4000)
127 /* File needs atomic accesses to f_pos */
128 #define FMODE_ATOMIC_POS ((__force fmode_t)0x8000)
129 /* Write access to underlying fs */
130 #define FMODE_WRITER ((__force fmode_t)0x10000)
131 /* Has read method(s) */
132 #define FMODE_CAN_READ ((__force fmode_t)0x20000)
133 /* Has write method(s) */
134 #define FMODE_CAN_WRITE ((__force fmode_t)0x40000)
136 /* File was opened by fanotify and shouldn't generate fanotify events */
137 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
140 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
141 * that indicates that they should check the contents of the iovec are
142 * valid, but not check the memory that the iovec elements
145 #define CHECK_IOVEC_ONLY -1
148 * The below are the various read and write types that we support. Some of
149 * them include behavioral modifiers that send information down to the
150 * block layer and IO scheduler. Terminology:
152 * The block layer uses device plugging to defer IO a little bit, in
153 * the hope that we will see more IO very shortly. This increases
154 * coalescing of adjacent IO and thus reduces the number of IOs we
155 * have to send to the device. It also allows for better queuing,
156 * if the IO isn't mergeable. If the caller is going to be waiting
157 * for the IO, then he must ensure that the device is unplugged so
158 * that the IO is dispatched to the driver.
160 * All IO is handled async in Linux. This is fine for background
161 * writes, but for reads or writes that someone waits for completion
162 * on, we want to notify the block layer and IO scheduler so that they
163 * know about it. That allows them to make better scheduling
164 * decisions. So when the below references 'sync' and 'async', it
165 * is referencing this priority hint.
167 * With that in mind, the available types are:
169 * READ A normal read operation. Device will be plugged.
170 * READ_SYNC A synchronous read. Device is not plugged, caller can
171 * immediately wait on this read without caring about
173 * READA Used for read-ahead operations. Lower priority, and the
174 * block layer could (in theory) choose to ignore this
175 * request if it runs into resource problems.
176 * WRITE A normal async write. Device will be plugged.
177 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down
178 * the hint that someone will be waiting on this IO
179 * shortly. The write equivalent of READ_SYNC.
180 * WRITE_ODIRECT Special case write for O_DIRECT only.
181 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
182 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
183 * non-volatile media on completion.
184 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
185 * by a cache flush and data is guaranteed to be on
186 * non-volatile media on completion.
189 #define RW_MASK REQ_WRITE
190 #define RWA_MASK REQ_RAHEAD
193 #define WRITE RW_MASK
194 #define READA RWA_MASK
195 #define KERNEL_READ (READ|REQ_KERNEL)
196 #define KERNEL_WRITE (WRITE|REQ_KERNEL)
198 #define READ_SYNC (READ | REQ_SYNC)
199 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
200 #define WRITE_ODIRECT (WRITE | REQ_SYNC)
201 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
202 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
203 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
206 * Attribute flags. These should be or-ed together to figure out what
209 #define ATTR_MODE (1 << 0)
210 #define ATTR_UID (1 << 1)
211 #define ATTR_GID (1 << 2)
212 #define ATTR_SIZE (1 << 3)
213 #define ATTR_ATIME (1 << 4)
214 #define ATTR_MTIME (1 << 5)
215 #define ATTR_CTIME (1 << 6)
216 #define ATTR_ATIME_SET (1 << 7)
217 #define ATTR_MTIME_SET (1 << 8)
218 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
219 #define ATTR_ATTR_FLAG (1 << 10)
220 #define ATTR_KILL_SUID (1 << 11)
221 #define ATTR_KILL_SGID (1 << 12)
222 #define ATTR_FILE (1 << 13)
223 #define ATTR_KILL_PRIV (1 << 14)
224 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
225 #define ATTR_TIMES_SET (1 << 16)
228 * This is the Inode Attributes structure, used for notify_change(). It
229 * uses the above definitions as flags, to know which values have changed.
230 * Also, in this manner, a Filesystem can look at only the values it cares
231 * about. Basically, these are the attributes that the VFS layer can
232 * request to change from the FS layer.
234 * Derek Atkins <warlord@MIT.EDU> 94-10-20
237 unsigned int ia_valid
;
242 struct timespec ia_atime
;
243 struct timespec ia_mtime
;
244 struct timespec ia_ctime
;
247 * Not an attribute, but an auxiliary info for filesystems wanting to
248 * implement an ftruncate() like method. NOTE: filesystem should
249 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
251 struct file
*ia_file
;
255 * Includes for diskquotas.
257 #include <linux/quota.h>
260 * enum positive_aop_returns - aop return codes with specific semantics
262 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
263 * completed, that the page is still locked, and
264 * should be considered active. The VM uses this hint
265 * to return the page to the active list -- it won't
266 * be a candidate for writeback again in the near
267 * future. Other callers must be careful to unlock
268 * the page if they get this return. Returned by
271 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
272 * unlocked it and the page might have been truncated.
273 * The caller should back up to acquiring a new page and
274 * trying again. The aop will be taking reasonable
275 * precautions not to livelock. If the caller held a page
276 * reference, it should drop it before retrying. Returned
279 * address_space_operation functions return these large constants to indicate
280 * special semantics to the caller. These are much larger than the bytes in a
281 * page to allow for functions that return the number of bytes operated on in a
285 enum positive_aop_returns
{
286 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
287 AOP_TRUNCATED_PAGE
= 0x80001,
290 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
291 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
292 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
293 * helper code (eg buffer layer)
294 * to clear GFP_FS from alloc */
297 * oh the beauties of C type declarations.
300 struct address_space
;
301 struct writeback_control
;
304 * "descriptor" for what we're up to with a read.
305 * This allows us to use the same read code yet
306 * have multiple different users of the data that
307 * we read from a file.
309 * The simplest case just copies the data to user
322 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
323 unsigned long, unsigned long);
325 struct address_space_operations
{
326 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
327 int (*readpage
)(struct file
*, struct page
*);
329 /* Write back some dirty pages from this mapping. */
330 int (*writepages
)(struct address_space
*, struct writeback_control
*);
332 /* Set a page dirty. Return true if this dirtied it */
333 int (*set_page_dirty
)(struct page
*page
);
335 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
336 struct list_head
*pages
, unsigned nr_pages
);
338 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
339 loff_t pos
, unsigned len
, unsigned flags
,
340 struct page
**pagep
, void **fsdata
);
341 int (*write_end
)(struct file
*, struct address_space
*mapping
,
342 loff_t pos
, unsigned len
, unsigned copied
,
343 struct page
*page
, void *fsdata
);
345 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
346 sector_t (*bmap
)(struct address_space
*, sector_t
);
347 void (*invalidatepage
) (struct page
*, unsigned int, unsigned int);
348 int (*releasepage
) (struct page
*, gfp_t
);
349 void (*freepage
)(struct page
*);
350 ssize_t (*direct_IO
)(int, struct kiocb
*, struct iov_iter
*iter
, loff_t offset
);
351 int (*get_xip_mem
)(struct address_space
*, pgoff_t
, int,
352 void **, unsigned long *);
354 * migrate the contents of a page to the specified target. If
355 * migrate_mode is MIGRATE_ASYNC, it must not block.
357 int (*migratepage
) (struct address_space
*,
358 struct page
*, struct page
*, enum migrate_mode
);
359 int (*launder_page
) (struct page
*);
360 int (*is_partially_uptodate
) (struct page
*, unsigned long,
362 void (*is_dirty_writeback
) (struct page
*, bool *, bool *);
363 int (*error_remove_page
)(struct address_space
*, struct page
*);
365 /* swapfile support */
366 int (*swap_activate
)(struct swap_info_struct
*sis
, struct file
*file
,
368 void (*swap_deactivate
)(struct file
*file
);
371 extern const struct address_space_operations empty_aops
;
374 * pagecache_write_begin/pagecache_write_end must be used by general code
375 * to write into the pagecache.
377 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
378 loff_t pos
, unsigned len
, unsigned flags
,
379 struct page
**pagep
, void **fsdata
);
381 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
382 loff_t pos
, unsigned len
, unsigned copied
,
383 struct page
*page
, void *fsdata
);
385 struct backing_dev_info
;
386 struct address_space
{
387 struct inode
*host
; /* owner: inode, block_device */
388 struct radix_tree_root page_tree
; /* radix tree of all pages */
389 spinlock_t tree_lock
; /* and lock protecting it */
390 unsigned int i_mmap_writable
;/* count VM_SHARED mappings */
391 struct rb_root i_mmap
; /* tree of private and shared mappings */
392 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
393 struct mutex i_mmap_mutex
; /* protect tree, count, list */
394 /* Protected by tree_lock together with the radix tree */
395 unsigned long nrpages
; /* number of total pages */
396 unsigned long nrshadows
; /* number of shadow entries */
397 pgoff_t writeback_index
;/* writeback starts here */
398 const struct address_space_operations
*a_ops
; /* methods */
399 unsigned long flags
; /* error bits/gfp mask */
400 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
401 spinlock_t private_lock
; /* for use by the address_space */
402 struct list_head private_list
; /* ditto */
403 void *private_data
; /* ditto */
404 } __attribute__((aligned(sizeof(long))));
406 * On most architectures that alignment is already the case; but
407 * must be enforced here for CRIS, to let the least significant bit
408 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
410 struct request_queue
;
412 struct block_device
{
413 dev_t bd_dev
; /* not a kdev_t - it's a search key */
415 struct inode
* bd_inode
; /* will die */
416 struct super_block
* bd_super
;
417 struct mutex bd_mutex
; /* open/close mutex */
418 struct list_head bd_inodes
;
422 bool bd_write_holder
;
424 struct list_head bd_holder_disks
;
426 struct block_device
* bd_contains
;
427 unsigned bd_block_size
;
428 struct hd_struct
* bd_part
;
429 /* number of times partitions within this device have been opened. */
430 unsigned bd_part_count
;
432 struct gendisk
* bd_disk
;
433 struct request_queue
* bd_queue
;
434 struct list_head bd_list
;
436 * Private data. You must have bd_claim'ed the block_device
437 * to use this. NOTE: bd_claim allows an owner to claim
438 * the same device multiple times, the owner must take special
439 * care to not mess up bd_private for that case.
441 unsigned long bd_private
;
443 /* The counter of freeze processes */
444 int bd_fsfreeze_count
;
445 /* Mutex for freeze */
446 struct mutex bd_fsfreeze_mutex
;
450 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
453 #define PAGECACHE_TAG_DIRTY 0
454 #define PAGECACHE_TAG_WRITEBACK 1
455 #define PAGECACHE_TAG_TOWRITE 2
457 int mapping_tagged(struct address_space
*mapping
, int tag
);
460 * Might pages of this file be mapped into userspace?
462 static inline int mapping_mapped(struct address_space
*mapping
)
464 return !RB_EMPTY_ROOT(&mapping
->i_mmap
) ||
465 !list_empty(&mapping
->i_mmap_nonlinear
);
469 * Might pages of this file have been modified in userspace?
470 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
471 * marks vma as VM_SHARED if it is shared, and the file was opened for
472 * writing i.e. vma may be mprotected writable even if now readonly.
474 static inline int mapping_writably_mapped(struct address_space
*mapping
)
476 return mapping
->i_mmap_writable
!= 0;
480 * Use sequence counter to get consistent i_size on 32-bit processors.
482 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
483 #include <linux/seqlock.h>
484 #define __NEED_I_SIZE_ORDERED
485 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
487 #define i_size_ordered_init(inode) do { } while (0)
491 #define ACL_NOT_CACHED ((void *)(-1))
493 #define IOP_FASTPERM 0x0001
494 #define IOP_LOOKUP 0x0002
495 #define IOP_NOFOLLOW 0x0004
498 * Keep mostly read-only and often accessed (especially for
499 * the RCU path lookup and 'stat' data) fields at the beginning
500 * of the 'struct inode'
504 unsigned short i_opflags
;
507 unsigned int i_flags
;
509 #ifdef CONFIG_FS_POSIX_ACL
510 struct posix_acl
*i_acl
;
511 struct posix_acl
*i_default_acl
;
514 const struct inode_operations
*i_op
;
515 struct super_block
*i_sb
;
516 struct address_space
*i_mapping
;
518 #ifdef CONFIG_SECURITY
522 /* Stat data, not accessed from path walking */
525 * Filesystems may only read i_nlink directly. They shall use the
526 * following functions for modification:
528 * (set|clear|inc|drop)_nlink
529 * inode_(inc|dec)_link_count
532 const unsigned int i_nlink
;
533 unsigned int __i_nlink
;
537 struct timespec i_atime
;
538 struct timespec i_mtime
;
539 struct timespec i_ctime
;
540 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
541 unsigned short i_bytes
;
542 unsigned int i_blkbits
;
545 #ifdef __NEED_I_SIZE_ORDERED
546 seqcount_t i_size_seqcount
;
550 unsigned long i_state
;
551 struct mutex i_mutex
;
553 unsigned long dirtied_when
; /* jiffies of first dirtying */
555 struct hlist_node i_hash
;
556 struct list_head i_wb_list
; /* backing dev IO list */
557 struct list_head i_lru
; /* inode LRU list */
558 struct list_head i_sb_list
;
560 struct hlist_head i_dentry
;
561 struct rcu_head i_rcu
;
565 atomic_t i_dio_count
;
566 atomic_t i_writecount
;
568 atomic_t i_readcount
; /* struct files open RO */
570 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
571 struct file_lock
*i_flock
;
572 struct address_space i_data
;
574 struct dquot
*i_dquot
[MAXQUOTAS
];
576 struct list_head i_devices
;
578 struct pipe_inode_info
*i_pipe
;
579 struct block_device
*i_bdev
;
585 #ifdef CONFIG_FSNOTIFY
586 __u32 i_fsnotify_mask
; /* all events this inode cares about */
587 struct hlist_head i_fsnotify_marks
;
590 void *i_private
; /* fs or device private pointer */
593 static inline int inode_unhashed(struct inode
*inode
)
595 return hlist_unhashed(&inode
->i_hash
);
599 * inode->i_mutex nesting subclasses for the lock validator:
601 * 0: the object of the current VFS operation
605 * 4: second non-directory
606 * The last is for certain operations (such as rename) which lock two
607 * non-directories at once.
609 * The locking order between these classes is
610 * parent -> child -> normal -> xattr -> second non-directory
612 enum inode_i_mutex_lock_class
621 void lock_two_nondirectories(struct inode
*, struct inode
*);
622 void unlock_two_nondirectories(struct inode
*, struct inode
*);
625 * NOTE: in a 32bit arch with a preemptable kernel and
626 * an UP compile the i_size_read/write must be atomic
627 * with respect to the local cpu (unlike with preempt disabled),
628 * but they don't need to be atomic with respect to other cpus like in
629 * true SMP (so they need either to either locally disable irq around
630 * the read or for example on x86 they can be still implemented as a
631 * cmpxchg8b without the need of the lock prefix). For SMP compiles
632 * and 64bit archs it makes no difference if preempt is enabled or not.
634 static inline loff_t
i_size_read(const struct inode
*inode
)
636 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
641 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
642 i_size
= inode
->i_size
;
643 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
645 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
649 i_size
= inode
->i_size
;
653 return inode
->i_size
;
658 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
659 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
660 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
662 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
664 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
666 write_seqcount_begin(&inode
->i_size_seqcount
);
667 inode
->i_size
= i_size
;
668 write_seqcount_end(&inode
->i_size_seqcount
);
670 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
672 inode
->i_size
= i_size
;
675 inode
->i_size
= i_size
;
679 /* Helper functions so that in most cases filesystems will
680 * not need to deal directly with kuid_t and kgid_t and can
681 * instead deal with the raw numeric values that are stored
684 static inline uid_t
i_uid_read(const struct inode
*inode
)
686 return from_kuid(&init_user_ns
, inode
->i_uid
);
689 static inline gid_t
i_gid_read(const struct inode
*inode
)
691 return from_kgid(&init_user_ns
, inode
->i_gid
);
694 static inline void i_uid_write(struct inode
*inode
, uid_t uid
)
696 inode
->i_uid
= make_kuid(&init_user_ns
, uid
);
699 static inline void i_gid_write(struct inode
*inode
, gid_t gid
)
701 inode
->i_gid
= make_kgid(&init_user_ns
, gid
);
704 static inline unsigned iminor(const struct inode
*inode
)
706 return MINOR(inode
->i_rdev
);
709 static inline unsigned imajor(const struct inode
*inode
)
711 return MAJOR(inode
->i_rdev
);
714 extern struct block_device
*I_BDEV(struct inode
*inode
);
717 rwlock_t lock
; /* protects pid, uid, euid fields */
718 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
719 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
720 kuid_t uid
, euid
; /* uid/euid of process setting the owner */
721 int signum
; /* posix.1b rt signal to be delivered on IO */
725 * Track a single file's readahead state
727 struct file_ra_state
{
728 pgoff_t start
; /* where readahead started */
729 unsigned int size
; /* # of readahead pages */
730 unsigned int async_size
; /* do asynchronous readahead when
731 there are only # of pages ahead */
733 unsigned int ra_pages
; /* Maximum readahead window */
734 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
735 loff_t prev_pos
; /* Cache last read() position */
739 * Check if @index falls in the readahead windows.
741 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
743 return (index
>= ra
->start
&&
744 index
< ra
->start
+ ra
->size
);
749 struct llist_node fu_llist
;
750 struct rcu_head fu_rcuhead
;
753 #define f_dentry f_path.dentry
754 struct inode
*f_inode
; /* cached value */
755 const struct file_operations
*f_op
;
758 * Protects f_ep_links, f_flags.
759 * Must not be taken from IRQ context.
762 atomic_long_t f_count
;
763 unsigned int f_flags
;
765 struct mutex f_pos_lock
;
767 struct fown_struct f_owner
;
768 const struct cred
*f_cred
;
769 struct file_ra_state f_ra
;
772 #ifdef CONFIG_SECURITY
775 /* needed for tty driver, and maybe others */
779 /* Used by fs/eventpoll.c to link all the hooks to this file */
780 struct list_head f_ep_links
;
781 struct list_head f_tfile_llink
;
782 #endif /* #ifdef CONFIG_EPOLL */
783 struct address_space
*f_mapping
;
784 } __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */
789 /* file identifier */
790 unsigned char f_handle
[0];
793 static inline struct file
*get_file(struct file
*f
)
795 atomic_long_inc(&f
->f_count
);
798 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
799 #define file_count(x) atomic_long_read(&(x)->f_count)
801 #define MAX_NON_LFS ((1UL<<31) - 1)
803 /* Page cache limit. The filesystems should put that into their s_maxbytes
804 limits, otherwise bad things can happen in VM. */
805 #if BITS_PER_LONG==32
806 #define MAX_LFS_FILESIZE (((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
807 #elif BITS_PER_LONG==64
808 #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL)
813 #define FL_DELEG 4 /* NFSv4 delegation */
814 #define FL_ACCESS 8 /* not trying to lock, just looking */
815 #define FL_EXISTS 16 /* when unlocking, test for existence */
816 #define FL_LEASE 32 /* lease held on this file */
817 #define FL_CLOSE 64 /* unlock on close */
818 #define FL_SLEEP 128 /* A blocking lock */
819 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
820 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
821 #define FL_OFDLCK 1024 /* lock is "owned" by struct file */
824 * Special return value from posix_lock_file() and vfs_lock_file() for
825 * asynchronous locking.
827 #define FILE_LOCK_DEFERRED 1
830 * The POSIX file lock owner is determined by
831 * the "struct files_struct" in the thread group
832 * (or NULL for no owner - BSD locks).
834 * Lockd stuffs a "host" pointer into this.
836 typedef struct files_struct
*fl_owner_t
;
838 struct file_lock_operations
{
839 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
840 void (*fl_release_private
)(struct file_lock
*);
843 struct lock_manager_operations
{
844 int (*lm_compare_owner
)(struct file_lock
*, struct file_lock
*);
845 unsigned long (*lm_owner_key
)(struct file_lock
*);
846 void (*lm_notify
)(struct file_lock
*); /* unblock callback */
847 int (*lm_grant
)(struct file_lock
*, struct file_lock
*, int);
848 void (*lm_break
)(struct file_lock
*);
849 int (*lm_change
)(struct file_lock
**, int);
852 struct lock_manager
{
853 struct list_head list
;
857 void locks_start_grace(struct net
*, struct lock_manager
*);
858 void locks_end_grace(struct lock_manager
*);
859 int locks_in_grace(struct net
*);
861 /* that will die - we need it for nfs_lock_info */
862 #include <linux/nfs_fs_i.h>
865 * struct file_lock represents a generic "file lock". It's used to represent
866 * POSIX byte range locks, BSD (flock) locks, and leases. It's important to
867 * note that the same struct is used to represent both a request for a lock and
868 * the lock itself, but the same object is never used for both.
870 * FIXME: should we create a separate "struct lock_request" to help distinguish
873 * The i_flock list is ordered by:
875 * 1) lock type -- FL_LEASEs first, then FL_FLOCK, and finally FL_POSIX
877 * 3) lock range start
880 * Obviously, the last two criteria only matter for POSIX locks.
883 struct file_lock
*fl_next
; /* singly linked list for this inode */
884 struct hlist_node fl_link
; /* node in global lists */
885 struct list_head fl_block
; /* circular list of blocked processes */
887 unsigned int fl_flags
;
888 unsigned char fl_type
;
890 int fl_link_cpu
; /* what cpu's list is this on? */
891 struct pid
*fl_nspid
;
892 wait_queue_head_t fl_wait
;
893 struct file
*fl_file
;
897 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
898 /* for lease breaks: */
899 unsigned long fl_break_time
;
900 unsigned long fl_downgrade_time
;
902 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
903 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
905 struct nfs_lock_info nfs_fl
;
906 struct nfs4_lock_info nfs4_fl
;
908 struct list_head link
; /* link in AFS vnode's pending_locks list */
909 int state
; /* state of grant or error if -ve */
914 /* The following constant reflects the upper bound of the file/locking space */
916 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
917 #define OFFSET_MAX INT_LIMIT(loff_t)
918 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
921 #include <linux/fcntl.h>
923 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
925 #ifdef CONFIG_FILE_LOCKING
926 extern int fcntl_getlk(struct file
*, unsigned int, struct flock __user
*);
927 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
928 struct flock __user
*);
930 #if BITS_PER_LONG == 32
931 extern int fcntl_getlk64(struct file
*, unsigned int, struct flock64 __user
*);
932 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
933 struct flock64 __user
*);
936 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
937 extern int fcntl_getlease(struct file
*filp
);
940 void locks_free_lock(struct file_lock
*fl
);
941 extern void locks_init_lock(struct file_lock
*);
942 extern struct file_lock
* locks_alloc_lock(void);
943 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
944 extern void __locks_copy_lock(struct file_lock
*, const struct file_lock
*);
945 extern void locks_remove_posix(struct file
*, fl_owner_t
);
946 extern void locks_remove_file(struct file
*);
947 extern void locks_release_private(struct file_lock
*);
948 extern void posix_test_lock(struct file
*, struct file_lock
*);
949 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
950 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
951 extern int posix_unblock_lock(struct file_lock
*);
952 extern int vfs_test_lock(struct file
*, struct file_lock
*);
953 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
954 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
955 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
956 extern int __break_lease(struct inode
*inode
, unsigned int flags
, unsigned int type
);
957 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
958 extern int generic_setlease(struct file
*, long, struct file_lock
**);
959 extern int vfs_setlease(struct file
*, long, struct file_lock
**);
960 extern int lease_modify(struct file_lock
**, int);
961 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
962 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
963 #else /* !CONFIG_FILE_LOCKING */
964 static inline int fcntl_getlk(struct file
*file
, unsigned int cmd
,
965 struct flock __user
*user
)
970 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
971 unsigned int cmd
, struct flock __user
*user
)
976 #if BITS_PER_LONG == 32
977 static inline int fcntl_getlk64(struct file
*file
, unsigned int cmd
,
978 struct flock64 __user
*user
)
983 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
984 unsigned int cmd
, struct flock64 __user
*user
)
989 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
994 static inline int fcntl_getlease(struct file
*filp
)
999 static inline void locks_init_lock(struct file_lock
*fl
)
1004 static inline void __locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1009 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1014 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1019 static inline void locks_remove_file(struct file
*filp
)
1024 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1029 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1030 struct file_lock
*conflock
)
1035 static inline int posix_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1040 static inline int posix_unblock_lock(struct file_lock
*waiter
)
1045 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1050 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1051 struct file_lock
*fl
, struct file_lock
*conf
)
1056 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1061 static inline int flock_lock_file_wait(struct file
*filp
,
1062 struct file_lock
*request
)
1067 static inline int __break_lease(struct inode
*inode
, unsigned int mode
, unsigned int type
)
1072 static inline void lease_get_mtime(struct inode
*inode
, struct timespec
*time
)
1077 static inline int generic_setlease(struct file
*filp
, long arg
,
1078 struct file_lock
**flp
)
1083 static inline int vfs_setlease(struct file
*filp
, long arg
,
1084 struct file_lock
**lease
)
1089 static inline int lease_modify(struct file_lock
**before
, int arg
)
1094 static inline int lock_may_read(struct inode
*inode
, loff_t start
,
1100 static inline int lock_may_write(struct inode
*inode
, loff_t start
,
1105 #endif /* !CONFIG_FILE_LOCKING */
1108 struct fasync_struct
{
1112 struct fasync_struct
*fa_next
; /* singly linked list */
1113 struct file
*fa_file
;
1114 struct rcu_head fa_rcu
;
1117 #define FASYNC_MAGIC 0x4601
1119 /* SMP safe fasync helpers: */
1120 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1121 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1122 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1123 extern struct fasync_struct
*fasync_alloc(void);
1124 extern void fasync_free(struct fasync_struct
*);
1126 /* can be called from interrupts */
1127 extern void kill_fasync(struct fasync_struct
**, int, int);
1129 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1130 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1131 extern void f_delown(struct file
*filp
);
1132 extern pid_t
f_getown(struct file
*filp
);
1133 extern int send_sigurg(struct fown_struct
*fown
);
1141 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1142 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1143 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1144 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1145 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1147 extern struct list_head super_blocks
;
1148 extern spinlock_t sb_lock
;
1150 /* Possible states of 'frozen' field */
1152 SB_UNFROZEN
= 0, /* FS is unfrozen */
1153 SB_FREEZE_WRITE
= 1, /* Writes, dir ops, ioctls frozen */
1154 SB_FREEZE_PAGEFAULT
= 2, /* Page faults stopped as well */
1155 SB_FREEZE_FS
= 3, /* For internal FS use (e.g. to stop
1156 * internal threads if needed) */
1157 SB_FREEZE_COMPLETE
= 4, /* ->freeze_fs finished successfully */
1160 #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
1163 /* Counters for counting writers at each level */
1164 struct percpu_counter counter
[SB_FREEZE_LEVELS
];
1165 wait_queue_head_t wait
; /* queue for waiting for
1166 writers / faults to finish */
1167 int frozen
; /* Is sb frozen? */
1168 wait_queue_head_t wait_unfrozen
; /* queue for waiting for
1170 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1171 struct lockdep_map lock_map
[SB_FREEZE_LEVELS
];
1175 struct super_block
{
1176 struct list_head s_list
; /* Keep this first */
1177 dev_t s_dev
; /* search index; _not_ kdev_t */
1178 unsigned char s_blocksize_bits
;
1179 unsigned long s_blocksize
;
1180 loff_t s_maxbytes
; /* Max file size */
1181 struct file_system_type
*s_type
;
1182 const struct super_operations
*s_op
;
1183 const struct dquot_operations
*dq_op
;
1184 const struct quotactl_ops
*s_qcop
;
1185 const struct export_operations
*s_export_op
;
1186 unsigned long s_flags
;
1187 unsigned long s_magic
;
1188 struct dentry
*s_root
;
1189 struct rw_semaphore s_umount
;
1192 #ifdef CONFIG_SECURITY
1195 const struct xattr_handler
**s_xattr
;
1197 struct list_head s_inodes
; /* all inodes */
1198 struct hlist_bl_head s_anon
; /* anonymous dentries for (nfs) exporting */
1199 struct list_head s_mounts
; /* list of mounts; _not_ for fs use */
1200 struct block_device
*s_bdev
;
1201 struct backing_dev_info
*s_bdi
;
1202 struct mtd_info
*s_mtd
;
1203 struct hlist_node s_instances
;
1204 struct quota_info s_dquot
; /* Diskquota specific options */
1206 struct sb_writers s_writers
;
1208 char s_id
[32]; /* Informational name */
1209 u8 s_uuid
[16]; /* UUID */
1211 void *s_fs_info
; /* Filesystem private info */
1212 unsigned int s_max_links
;
1215 /* Granularity of c/m/atime in ns.
1216 Cannot be worse than a second */
1220 * The next field is for VFS *only*. No filesystems have any business
1221 * even looking at it. You had been warned.
1223 struct mutex s_vfs_rename_mutex
; /* Kludge */
1226 * Filesystem subtype. If non-empty the filesystem type field
1227 * in /proc/mounts will be "type.subtype"
1232 * Saved mount options for lazy filesystems using
1233 * generic_show_options()
1235 char __rcu
*s_options
;
1236 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1239 * Saved pool identifier for cleancache (-1 means none)
1241 int cleancache_poolid
;
1243 struct shrinker s_shrink
; /* per-sb shrinker handle */
1245 /* Number of inodes with nlink == 0 but still referenced */
1246 atomic_long_t s_remove_count
;
1248 /* Being remounted read-only */
1249 int s_readonly_remount
;
1251 /* AIO completions deferred from interrupt context */
1252 struct workqueue_struct
*s_dio_done_wq
;
1255 * Keep the lru lists last in the structure so they always sit on their
1256 * own individual cachelines.
1258 struct list_lru s_dentry_lru ____cacheline_aligned_in_smp
;
1259 struct list_lru s_inode_lru ____cacheline_aligned_in_smp
;
1260 struct rcu_head rcu
;
1263 extern struct timespec
current_fs_time(struct super_block
*sb
);
1266 * Snapshotting support.
1269 void __sb_end_write(struct super_block
*sb
, int level
);
1270 int __sb_start_write(struct super_block
*sb
, int level
, bool wait
);
1273 * sb_end_write - drop write access to a superblock
1274 * @sb: the super we wrote to
1276 * Decrement number of writers to the filesystem. Wake up possible waiters
1277 * wanting to freeze the filesystem.
1279 static inline void sb_end_write(struct super_block
*sb
)
1281 __sb_end_write(sb
, SB_FREEZE_WRITE
);
1285 * sb_end_pagefault - drop write access to a superblock from a page fault
1286 * @sb: the super we wrote to
1288 * Decrement number of processes handling write page fault to the filesystem.
1289 * Wake up possible waiters wanting to freeze the filesystem.
1291 static inline void sb_end_pagefault(struct super_block
*sb
)
1293 __sb_end_write(sb
, SB_FREEZE_PAGEFAULT
);
1297 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
1298 * @sb: the super we wrote to
1300 * Decrement fs-internal number of writers to the filesystem. Wake up possible
1301 * waiters wanting to freeze the filesystem.
1303 static inline void sb_end_intwrite(struct super_block
*sb
)
1305 __sb_end_write(sb
, SB_FREEZE_FS
);
1309 * sb_start_write - get write access to a superblock
1310 * @sb: the super we write to
1312 * When a process wants to write data or metadata to a file system (i.e. dirty
1313 * a page or an inode), it should embed the operation in a sb_start_write() -
1314 * sb_end_write() pair to get exclusion against file system freezing. This
1315 * function increments number of writers preventing freezing. If the file
1316 * system is already frozen, the function waits until the file system is
1319 * Since freeze protection behaves as a lock, users have to preserve
1320 * ordering of freeze protection and other filesystem locks. Generally,
1321 * freeze protection should be the outermost lock. In particular, we have:
1324 * -> i_mutex (write path, truncate, directory ops, ...)
1325 * -> s_umount (freeze_super, thaw_super)
1327 static inline void sb_start_write(struct super_block
*sb
)
1329 __sb_start_write(sb
, SB_FREEZE_WRITE
, true);
1332 static inline int sb_start_write_trylock(struct super_block
*sb
)
1334 return __sb_start_write(sb
, SB_FREEZE_WRITE
, false);
1338 * sb_start_pagefault - get write access to a superblock from a page fault
1339 * @sb: the super we write to
1341 * When a process starts handling write page fault, it should embed the
1342 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
1343 * exclusion against file system freezing. This is needed since the page fault
1344 * is going to dirty a page. This function increments number of running page
1345 * faults preventing freezing. If the file system is already frozen, the
1346 * function waits until the file system is thawed.
1348 * Since page fault freeze protection behaves as a lock, users have to preserve
1349 * ordering of freeze protection and other filesystem locks. It is advised to
1350 * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
1351 * handling code implies lock dependency:
1354 * -> sb_start_pagefault
1356 static inline void sb_start_pagefault(struct super_block
*sb
)
1358 __sb_start_write(sb
, SB_FREEZE_PAGEFAULT
, true);
1362 * sb_start_intwrite - get write access to a superblock for internal fs purposes
1363 * @sb: the super we write to
1365 * This is the third level of protection against filesystem freezing. It is
1366 * free for use by a filesystem. The only requirement is that it must rank
1367 * below sb_start_pagefault.
1369 * For example filesystem can call sb_start_intwrite() when starting a
1370 * transaction which somewhat eases handling of freezing for internal sources
1371 * of filesystem changes (internal fs threads, discarding preallocation on file
1374 static inline void sb_start_intwrite(struct super_block
*sb
)
1376 __sb_start_write(sb
, SB_FREEZE_FS
, true);
1380 extern bool inode_owner_or_capable(const struct inode
*inode
);
1383 * VFS helper functions..
1385 extern int vfs_create(struct inode
*, struct dentry
*, umode_t
, bool);
1386 extern int vfs_mkdir(struct inode
*, struct dentry
*, umode_t
);
1387 extern int vfs_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
1388 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1389 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*, struct inode
**);
1390 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1391 extern int vfs_unlink(struct inode
*, struct dentry
*, struct inode
**);
1392 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*, struct inode
**, unsigned int);
1395 * VFS dentry helper functions.
1397 extern void dentry_unhash(struct dentry
*dentry
);
1400 * VFS file helper functions.
1402 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1405 * VFS FS_IOC_FIEMAP helper definitions.
1407 struct fiemap_extent_info
{
1408 unsigned int fi_flags
; /* Flags as passed from user */
1409 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1410 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1411 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1412 fiemap_extent array */
1414 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1415 u64 phys
, u64 len
, u32 flags
);
1416 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1421 * NOTE! These match bits 12..15 of stat.st_mode
1422 * (ie "(i_mode >> 12) & 15").
1424 #define DT_UNKNOWN 0
1435 * This is the "filldir" function type, used by readdir() to let
1436 * the kernel specify what kind of dirent layout it wants to have.
1437 * This allows the kernel to read directories into kernel space or
1438 * to have different dirent layouts depending on the binary type.
1440 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1441 struct dir_context
{
1442 const filldir_t actor
;
1446 struct block_device_operations
;
1448 /* These macros are for out of kernel modules to test that
1449 * the kernel supports the unlocked_ioctl and compat_ioctl
1450 * fields in struct file_operations. */
1451 #define HAVE_COMPAT_IOCTL 1
1452 #define HAVE_UNLOCKED_IOCTL 1
1456 struct file_operations
{
1457 struct module
*owner
;
1458 loff_t (*llseek
) (struct file
*, loff_t
, int);
1459 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1460 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1461 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1462 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1463 ssize_t (*read_iter
) (struct kiocb
*, struct iov_iter
*);
1464 ssize_t (*write_iter
) (struct kiocb
*, struct iov_iter
*);
1465 int (*iterate
) (struct file
*, struct dir_context
*);
1466 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1467 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1468 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1469 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1470 int (*open
) (struct inode
*, struct file
*);
1471 int (*flush
) (struct file
*, fl_owner_t id
);
1472 int (*release
) (struct inode
*, struct file
*);
1473 int (*fsync
) (struct file
*, loff_t
, loff_t
, int datasync
);
1474 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1475 int (*fasync
) (int, struct file
*, int);
1476 int (*lock
) (struct file
*, int, struct file_lock
*);
1477 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1478 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1479 int (*check_flags
)(int);
1480 int (*flock
) (struct file
*, int, struct file_lock
*);
1481 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1482 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1483 int (*setlease
)(struct file
*, long, struct file_lock
**);
1484 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1486 int (*show_fdinfo
)(struct seq_file
*m
, struct file
*f
);
1489 struct inode_operations
{
1490 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, unsigned int);
1491 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1492 int (*permission
) (struct inode
*, int);
1493 struct posix_acl
* (*get_acl
)(struct inode
*, int);
1495 int (*readlink
) (struct dentry
*, char __user
*,int);
1496 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1498 int (*create
) (struct inode
*,struct dentry
*, umode_t
, bool);
1499 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1500 int (*unlink
) (struct inode
*,struct dentry
*);
1501 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1502 int (*mkdir
) (struct inode
*,struct dentry
*,umode_t
);
1503 int (*rmdir
) (struct inode
*,struct dentry
*);
1504 int (*mknod
) (struct inode
*,struct dentry
*,umode_t
,dev_t
);
1505 int (*rename
) (struct inode
*, struct dentry
*,
1506 struct inode
*, struct dentry
*);
1507 int (*rename2
) (struct inode
*, struct dentry
*,
1508 struct inode
*, struct dentry
*, unsigned int);
1509 int (*setattr
) (struct dentry
*, struct iattr
*);
1510 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1511 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1512 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1513 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1514 int (*removexattr
) (struct dentry
*, const char *);
1515 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1517 int (*update_time
)(struct inode
*, struct timespec
*, int);
1518 int (*atomic_open
)(struct inode
*, struct dentry
*,
1519 struct file
*, unsigned open_flag
,
1520 umode_t create_mode
, int *opened
);
1521 int (*tmpfile
) (struct inode
*, struct dentry
*, umode_t
);
1522 int (*set_acl
)(struct inode
*, struct posix_acl
*, int);
1523 } ____cacheline_aligned
;
1525 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1526 unsigned long nr_segs
, unsigned long fast_segs
,
1527 struct iovec
*fast_pointer
,
1528 struct iovec
**ret_pointer
);
1530 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1531 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1532 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1533 unsigned long, loff_t
*);
1534 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1535 unsigned long, loff_t
*);
1537 struct super_operations
{
1538 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1539 void (*destroy_inode
)(struct inode
*);
1541 void (*dirty_inode
) (struct inode
*, int flags
);
1542 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1543 int (*drop_inode
) (struct inode
*);
1544 void (*evict_inode
) (struct inode
*);
1545 void (*put_super
) (struct super_block
*);
1546 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1547 int (*freeze_fs
) (struct super_block
*);
1548 int (*unfreeze_fs
) (struct super_block
*);
1549 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1550 int (*remount_fs
) (struct super_block
*, int *, char *);
1551 void (*umount_begin
) (struct super_block
*);
1553 int (*show_options
)(struct seq_file
*, struct dentry
*);
1554 int (*show_devname
)(struct seq_file
*, struct dentry
*);
1555 int (*show_path
)(struct seq_file
*, struct dentry
*);
1556 int (*show_stats
)(struct seq_file
*, struct dentry
*);
1558 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1559 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1561 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1562 long (*nr_cached_objects
)(struct super_block
*, int);
1563 long (*free_cached_objects
)(struct super_block
*, long, int);
1567 * Inode flags - they have no relation to superblock flags now
1569 #define S_SYNC 1 /* Writes are synced at once */
1570 #define S_NOATIME 2 /* Do not update access times */
1571 #define S_APPEND 4 /* Append-only file */
1572 #define S_IMMUTABLE 8 /* Immutable file */
1573 #define S_DEAD 16 /* removed, but still open directory */
1574 #define S_NOQUOTA 32 /* Inode is not counted to quota */
1575 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
1576 #define S_NOCMTIME 128 /* Do not update file c/mtime */
1577 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
1578 #define S_PRIVATE 512 /* Inode is fs-internal */
1579 #define S_IMA 1024 /* Inode has an associated IMA struct */
1580 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
1581 #define S_NOSEC 4096 /* no suid or xattr security attributes */
1584 * Note that nosuid etc flags are inode-specific: setting some file-system
1585 * flags just means all the inodes inherit those flags by default. It might be
1586 * possible to override it selectively if you really wanted to with some
1587 * ioctl() that is not currently implemented.
1589 * Exception: MS_RDONLY is always applied to the entire file system.
1591 * Unfortunately, it is possible to change a filesystems flags with it mounted
1592 * with files in use. This means that all of the inodes will not have their
1593 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
1594 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
1596 #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg))
1598 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
1599 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
1600 ((inode)->i_flags & S_SYNC))
1601 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
1602 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
1603 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
1604 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
1605 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
1607 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
1608 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
1609 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
1610 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
1612 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
1613 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
1614 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
1615 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
1616 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
1617 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
1618 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
1621 * Inode state bits. Protected by inode->i_lock
1623 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1624 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1626 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1627 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1628 * various stages of removing an inode.
1630 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1632 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1633 * fdatasync(). i_atime is the usual cause.
1634 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1635 * these changes separately from I_DIRTY_SYNC so that we
1636 * don't have to write inode on fdatasync() when only
1637 * mtime has changed in it.
1638 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1639 * I_NEW Serves as both a mutex and completion notification.
1640 * New inodes set I_NEW. If two processes both create
1641 * the same inode, one of them will release its inode and
1642 * wait for I_NEW to be released before returning.
1643 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1644 * also cause waiting on I_NEW, without I_NEW actually
1645 * being set. find_inode() uses this to prevent returning
1646 * nearly-dead inodes.
1647 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1648 * is zero. I_FREEING must be set when I_WILL_FREE is
1650 * I_FREEING Set when inode is about to be freed but still has dirty
1651 * pages or buffers attached or the inode itself is still
1653 * I_CLEAR Added by clear_inode(). In this state the inode is
1654 * clean and can be destroyed. Inode keeps I_FREEING.
1656 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1657 * prohibited for many purposes. iget() must wait for
1658 * the inode to be completely released, then create it
1659 * anew. Other functions will just ignore such inodes,
1660 * if appropriate. I_NEW is used for waiting.
1662 * I_SYNC Writeback of inode is running. The bit is set during
1663 * data writeback, and cleared with a wakeup on the bit
1664 * address once it is done. The bit is also used to pin
1665 * the inode in memory for flusher thread.
1667 * I_REFERENCED Marks the inode as recently references on the LRU list.
1669 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1671 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1673 #define I_DIRTY_SYNC (1 << 0)
1674 #define I_DIRTY_DATASYNC (1 << 1)
1675 #define I_DIRTY_PAGES (1 << 2)
1677 #define I_NEW (1 << __I_NEW)
1678 #define I_WILL_FREE (1 << 4)
1679 #define I_FREEING (1 << 5)
1680 #define I_CLEAR (1 << 6)
1682 #define I_SYNC (1 << __I_SYNC)
1683 #define I_REFERENCED (1 << 8)
1684 #define __I_DIO_WAKEUP 9
1685 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1686 #define I_LINKABLE (1 << 10)
1688 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1690 extern void __mark_inode_dirty(struct inode
*, int);
1691 static inline void mark_inode_dirty(struct inode
*inode
)
1693 __mark_inode_dirty(inode
, I_DIRTY
);
1696 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1698 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1701 extern void inc_nlink(struct inode
*inode
);
1702 extern void drop_nlink(struct inode
*inode
);
1703 extern void clear_nlink(struct inode
*inode
);
1704 extern void set_nlink(struct inode
*inode
, unsigned int nlink
);
1706 static inline void inode_inc_link_count(struct inode
*inode
)
1709 mark_inode_dirty(inode
);
1712 static inline void inode_dec_link_count(struct inode
*inode
)
1715 mark_inode_dirty(inode
);
1719 * inode_inc_iversion - increments i_version
1720 * @inode: inode that need to be updated
1722 * Every time the inode is modified, the i_version field will be incremented.
1723 * The filesystem has to be mounted with i_version flag
1726 static inline void inode_inc_iversion(struct inode
*inode
)
1728 spin_lock(&inode
->i_lock
);
1730 spin_unlock(&inode
->i_lock
);
1733 enum file_time_flags
{
1740 extern void touch_atime(const struct path
*);
1741 static inline void file_accessed(struct file
*file
)
1743 if (!(file
->f_flags
& O_NOATIME
))
1744 touch_atime(&file
->f_path
);
1747 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1748 int sync_inode_metadata(struct inode
*inode
, int wait
);
1750 struct file_system_type
{
1753 #define FS_REQUIRES_DEV 1
1754 #define FS_BINARY_MOUNTDATA 2
1755 #define FS_HAS_SUBTYPE 4
1756 #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */
1757 #define FS_USERNS_DEV_MOUNT 16 /* A userns mount does not imply MNT_NODEV */
1758 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */
1759 struct dentry
*(*mount
) (struct file_system_type
*, int,
1760 const char *, void *);
1761 void (*kill_sb
) (struct super_block
*);
1762 struct module
*owner
;
1763 struct file_system_type
* next
;
1764 struct hlist_head fs_supers
;
1766 struct lock_class_key s_lock_key
;
1767 struct lock_class_key s_umount_key
;
1768 struct lock_class_key s_vfs_rename_key
;
1769 struct lock_class_key s_writers_key
[SB_FREEZE_LEVELS
];
1771 struct lock_class_key i_lock_key
;
1772 struct lock_class_key i_mutex_key
;
1773 struct lock_class_key i_mutex_dir_key
;
1776 #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)
1778 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
, int flags
,
1779 void *data
, int (*fill_super
)(struct super_block
*, void *, int));
1780 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
1781 int flags
, const char *dev_name
, void *data
,
1782 int (*fill_super
)(struct super_block
*, void *, int));
1783 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
1784 int flags
, void *data
,
1785 int (*fill_super
)(struct super_block
*, void *, int));
1786 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
1787 int flags
, void *data
,
1788 int (*fill_super
)(struct super_block
*, void *, int));
1789 extern struct dentry
*mount_subtree(struct vfsmount
*mnt
, const char *path
);
1790 void generic_shutdown_super(struct super_block
*sb
);
1791 void kill_block_super(struct super_block
*sb
);
1792 void kill_anon_super(struct super_block
*sb
);
1793 void kill_litter_super(struct super_block
*sb
);
1794 void deactivate_super(struct super_block
*sb
);
1795 void deactivate_locked_super(struct super_block
*sb
);
1796 int set_anon_super(struct super_block
*s
, void *data
);
1797 int get_anon_bdev(dev_t
*);
1798 void free_anon_bdev(dev_t
);
1799 struct super_block
*sget(struct file_system_type
*type
,
1800 int (*test
)(struct super_block
*,void *),
1801 int (*set
)(struct super_block
*,void *),
1802 int flags
, void *data
);
1803 extern struct dentry
*mount_pseudo(struct file_system_type
*, char *,
1804 const struct super_operations
*ops
,
1805 const struct dentry_operations
*dops
,
1808 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1809 #define fops_get(fops) \
1810 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1811 #define fops_put(fops) \
1812 do { if (fops) module_put((fops)->owner); } while(0)
1814 * This one is to be used *ONLY* from ->open() instances.
1815 * fops must be non-NULL, pinned down *and* module dependencies
1816 * should be sufficient to pin the caller down as well.
1818 #define replace_fops(f, fops) \
1820 struct file *__file = (f); \
1821 fops_put(__file->f_op); \
1822 BUG_ON(!(__file->f_op = (fops))); \
1825 extern int register_filesystem(struct file_system_type
*);
1826 extern int unregister_filesystem(struct file_system_type
*);
1827 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
1828 #define kern_mount(type) kern_mount_data(type, NULL)
1829 extern void kern_unmount(struct vfsmount
*mnt
);
1830 extern int may_umount_tree(struct vfsmount
*);
1831 extern int may_umount(struct vfsmount
*);
1832 extern long do_mount(const char *, const char *, const char *, unsigned long, void *);
1833 extern struct vfsmount
*collect_mounts(struct path
*);
1834 extern void drop_collected_mounts(struct vfsmount
*);
1835 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
1837 extern int vfs_statfs(struct path
*, struct kstatfs
*);
1838 extern int user_statfs(const char __user
*, struct kstatfs
*);
1839 extern int fd_statfs(int, struct kstatfs
*);
1840 extern int vfs_ustat(dev_t
, struct kstatfs
*);
1841 extern int freeze_super(struct super_block
*super
);
1842 extern int thaw_super(struct super_block
*super
);
1843 extern bool our_mnt(struct vfsmount
*mnt
);
1844 extern bool fs_fully_visible(struct file_system_type
*);
1846 extern int current_umask(void);
1848 extern void ihold(struct inode
* inode
);
1849 extern void iput(struct inode
*);
1851 static inline struct inode
*file_inode(struct file
*f
)
1857 extern struct kobject
*fs_kobj
;
1859 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1861 #define FLOCK_VERIFY_READ 1
1862 #define FLOCK_VERIFY_WRITE 2
1864 #ifdef CONFIG_FILE_LOCKING
1865 extern int locks_mandatory_locked(struct file
*);
1866 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1869 * Candidates for mandatory locking have the setgid bit set
1870 * but no group execute bit - an otherwise meaningless combination.
1873 static inline int __mandatory_lock(struct inode
*ino
)
1875 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
1879 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1880 * otherwise these will be advisory locks
1883 static inline int mandatory_lock(struct inode
*ino
)
1885 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
1888 static inline int locks_verify_locked(struct file
*file
)
1890 if (mandatory_lock(file_inode(file
)))
1891 return locks_mandatory_locked(file
);
1895 static inline int locks_verify_truncate(struct inode
*inode
,
1899 if (inode
->i_flock
&& mandatory_lock(inode
))
1900 return locks_mandatory_area(
1901 FLOCK_VERIFY_WRITE
, inode
, filp
,
1902 size
< inode
->i_size
? size
: inode
->i_size
,
1903 (size
< inode
->i_size
? inode
->i_size
- size
1904 : size
- inode
->i_size
)
1909 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1912 * Since this check is lockless, we must ensure that any refcounts
1913 * taken are done before checking inode->i_flock. Otherwise, we could
1914 * end up racing with tasks trying to set a new lease on this file.
1918 return __break_lease(inode
, mode
, FL_LEASE
);
1922 static inline int break_deleg(struct inode
*inode
, unsigned int mode
)
1925 * Since this check is lockless, we must ensure that any refcounts
1926 * taken are done before checking inode->i_flock. Otherwise, we could
1927 * end up racing with tasks trying to set a new lease on this file.
1931 return __break_lease(inode
, mode
, FL_DELEG
);
1935 static inline int try_break_deleg(struct inode
*inode
, struct inode
**delegated_inode
)
1939 ret
= break_deleg(inode
, O_WRONLY
|O_NONBLOCK
);
1940 if (ret
== -EWOULDBLOCK
&& delegated_inode
) {
1941 *delegated_inode
= inode
;
1947 static inline int break_deleg_wait(struct inode
**delegated_inode
)
1951 ret
= break_deleg(*delegated_inode
, O_WRONLY
);
1952 iput(*delegated_inode
);
1953 *delegated_inode
= NULL
;
1957 #else /* !CONFIG_FILE_LOCKING */
1958 static inline int locks_mandatory_locked(struct file
*file
)
1963 static inline int locks_mandatory_area(int rw
, struct inode
*inode
,
1964 struct file
*filp
, loff_t offset
,
1970 static inline int __mandatory_lock(struct inode
*inode
)
1975 static inline int mandatory_lock(struct inode
*inode
)
1980 static inline int locks_verify_locked(struct file
*file
)
1985 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
1991 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1996 static inline int break_deleg(struct inode
*inode
, unsigned int mode
)
2001 static inline int try_break_deleg(struct inode
*inode
, struct inode
**delegated_inode
)
2006 static inline int break_deleg_wait(struct inode
**delegated_inode
)
2012 #endif /* CONFIG_FILE_LOCKING */
2017 const char *name
; /* pointer to actual string */
2018 const __user
char *uptr
; /* original userland pointer */
2019 struct audit_names
*aname
;
2020 bool separate
; /* should "name" be freed? */
2023 extern long vfs_truncate(struct path
*, loff_t
);
2024 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
2026 extern int do_fallocate(struct file
*file
, int mode
, loff_t offset
,
2028 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
2030 extern struct file
*file_open_name(struct filename
*, int, umode_t
);
2031 extern struct file
*filp_open(const char *, int, umode_t
);
2032 extern struct file
*file_open_root(struct dentry
*, struct vfsmount
*,
2034 extern struct file
* dentry_open(const struct path
*, int, const struct cred
*);
2035 extern int filp_close(struct file
*, fl_owner_t id
);
2037 extern struct filename
*getname(const char __user
*);
2038 extern struct filename
*getname_kernel(const char *);
2044 extern int finish_open(struct file
*file
, struct dentry
*dentry
,
2045 int (*open
)(struct inode
*, struct file
*),
2047 extern int finish_no_open(struct file
*file
, struct dentry
*dentry
);
2051 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
2054 extern void __init
vfs_caches_init_early(void);
2055 extern void __init
vfs_caches_init(unsigned long);
2057 extern struct kmem_cache
*names_cachep
;
2059 extern void final_putname(struct filename
*name
);
2061 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
2062 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2063 #ifndef CONFIG_AUDITSYSCALL
2064 #define putname(name) final_putname(name)
2066 extern void putname(struct filename
*name
);
2070 extern int register_blkdev(unsigned int, const char *);
2071 extern void unregister_blkdev(unsigned int, const char *);
2072 extern struct block_device
*bdget(dev_t
);
2073 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2074 extern void bd_set_size(struct block_device
*, loff_t size
);
2075 extern void bd_forget(struct inode
*inode
);
2076 extern void bdput(struct block_device
*);
2077 extern void invalidate_bdev(struct block_device
*);
2078 extern void iterate_bdevs(void (*)(struct block_device
*, void *), void *);
2079 extern int sync_blockdev(struct block_device
*bdev
);
2080 extern void kill_bdev(struct block_device
*);
2081 extern struct super_block
*freeze_bdev(struct block_device
*);
2082 extern void emergency_thaw_all(void);
2083 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2084 extern int fsync_bdev(struct block_device
*);
2085 extern int sb_is_blkdev_sb(struct super_block
*sb
);
2087 static inline void bd_forget(struct inode
*inode
) {}
2088 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2089 static inline void kill_bdev(struct block_device
*bdev
) {}
2090 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2092 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2097 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2102 static inline void iterate_bdevs(void (*f
)(struct block_device
*, void *), void *arg
)
2106 static inline int sb_is_blkdev_sb(struct super_block
*sb
)
2111 extern int sync_filesystem(struct super_block
*);
2112 extern const struct file_operations def_blk_fops
;
2113 extern const struct file_operations def_chr_fops
;
2114 extern const struct file_operations bad_sock_fops
;
2116 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2117 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2118 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2119 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2120 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2122 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2124 extern void blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2126 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2127 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2128 struct gendisk
*disk
);
2130 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2131 struct gendisk
*disk
)
2135 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2136 struct gendisk
*disk
)
2143 #define CHRDEV_MAJOR_HASH_SIZE 255
2144 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2145 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2146 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2147 unsigned int count
, const char *name
,
2148 const struct file_operations
*fops
);
2149 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2150 unsigned int count
, const char *name
);
2151 extern void unregister_chrdev_region(dev_t
, unsigned);
2152 extern void chrdev_show(struct seq_file
*,off_t
);
2154 static inline int register_chrdev(unsigned int major
, const char *name
,
2155 const struct file_operations
*fops
)
2157 return __register_chrdev(major
, 0, 256, name
, fops
);
2160 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2162 __unregister_chrdev(major
, 0, 256, name
);
2165 /* fs/block_dev.c */
2166 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2167 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2170 #define BLKDEV_MAJOR_HASH_SIZE 255
2171 extern const char *__bdevname(dev_t
, char *buffer
);
2172 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2173 extern struct block_device
*lookup_bdev(const char *);
2174 extern void blkdev_show(struct seq_file
*,off_t
);
2177 #define BLKDEV_MAJOR_HASH_SIZE 0
2180 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2182 /* Invalid inode operations -- fs/bad_inode.c */
2183 extern void make_bad_inode(struct inode
*);
2184 extern int is_bad_inode(struct inode
*);
2188 * return READ, READA, or WRITE
2190 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2193 * return data direction, READ or WRITE
2195 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2197 extern void check_disk_size_change(struct gendisk
*disk
,
2198 struct block_device
*bdev
);
2199 extern int revalidate_disk(struct gendisk
*);
2200 extern int check_disk_change(struct block_device
*);
2201 extern int __invalidate_device(struct block_device
*, bool);
2202 extern int invalidate_partition(struct gendisk
*, int);
2204 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2205 pgoff_t start
, pgoff_t end
);
2207 static inline void invalidate_remote_inode(struct inode
*inode
)
2209 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2210 S_ISLNK(inode
->i_mode
))
2211 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2213 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2214 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2215 pgoff_t start
, pgoff_t end
);
2216 extern int write_inode_now(struct inode
*, int);
2217 extern int filemap_fdatawrite(struct address_space
*);
2218 extern int filemap_flush(struct address_space
*);
2219 extern int filemap_fdatawait(struct address_space
*);
2220 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2222 extern int filemap_write_and_wait(struct address_space
*mapping
);
2223 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2224 loff_t lstart
, loff_t lend
);
2225 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2226 loff_t start
, loff_t end
, int sync_mode
);
2227 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2228 loff_t start
, loff_t end
);
2230 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2232 extern int vfs_fsync(struct file
*file
, int datasync
);
2233 static inline int generic_write_sync(struct file
*file
, loff_t pos
, loff_t count
)
2235 if (!(file
->f_flags
& O_DSYNC
) && !IS_SYNC(file
->f_mapping
->host
))
2237 return vfs_fsync_range(file
, pos
, pos
+ count
- 1,
2238 (file
->f_flags
& __O_SYNC
) ? 0 : 1);
2240 extern void emergency_sync(void);
2241 extern void emergency_remount(void);
2243 extern sector_t
bmap(struct inode
*, sector_t
);
2245 extern int notify_change(struct dentry
*, struct iattr
*, struct inode
**);
2246 extern int inode_permission(struct inode
*, int);
2247 extern int generic_permission(struct inode
*, int);
2249 static inline bool execute_ok(struct inode
*inode
)
2251 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2254 static inline void file_start_write(struct file
*file
)
2256 if (!S_ISREG(file_inode(file
)->i_mode
))
2258 __sb_start_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
, true);
2261 static inline bool file_start_write_trylock(struct file
*file
)
2263 if (!S_ISREG(file_inode(file
)->i_mode
))
2265 return __sb_start_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
, false);
2268 static inline void file_end_write(struct file
*file
)
2270 if (!S_ISREG(file_inode(file
)->i_mode
))
2272 __sb_end_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
);
2276 * get_write_access() gets write permission for a file.
2277 * put_write_access() releases this write permission.
2278 * This is used for regular files.
2279 * We cannot support write (and maybe mmap read-write shared) accesses and
2280 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2281 * can have the following values:
2282 * 0: no writers, no VM_DENYWRITE mappings
2283 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2284 * > 0: (i_writecount) users are writing to the file.
2286 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2287 * except for the cases where we don't hold i_writecount yet. Then we need to
2288 * use {get,deny}_write_access() - these functions check the sign and refuse
2289 * to do the change if sign is wrong.
2291 static inline int get_write_access(struct inode
*inode
)
2293 return atomic_inc_unless_negative(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2295 static inline int deny_write_access(struct file
*file
)
2297 struct inode
*inode
= file_inode(file
);
2298 return atomic_dec_unless_positive(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2300 static inline void put_write_access(struct inode
* inode
)
2302 atomic_dec(&inode
->i_writecount
);
2304 static inline void allow_write_access(struct file
*file
)
2307 atomic_inc(&file_inode(file
)->i_writecount
);
2309 static inline bool inode_is_open_for_write(const struct inode
*inode
)
2311 return atomic_read(&inode
->i_writecount
) > 0;
2315 static inline void i_readcount_dec(struct inode
*inode
)
2317 BUG_ON(!atomic_read(&inode
->i_readcount
));
2318 atomic_dec(&inode
->i_readcount
);
2320 static inline void i_readcount_inc(struct inode
*inode
)
2322 atomic_inc(&inode
->i_readcount
);
2325 static inline void i_readcount_dec(struct inode
*inode
)
2329 static inline void i_readcount_inc(struct inode
*inode
)
2334 extern int do_pipe_flags(int *, int);
2336 extern int kernel_read(struct file
*, loff_t
, char *, unsigned long);
2337 extern ssize_t
kernel_write(struct file
*, const char *, size_t, loff_t
);
2338 extern struct file
* open_exec(const char *);
2340 /* fs/dcache.c -- generic fs support functions */
2341 extern int is_subdir(struct dentry
*, struct dentry
*);
2342 extern int path_is_under(struct path
*, struct path
*);
2344 #include <linux/err.h>
2346 /* needed for stackable file system support */
2347 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int whence
);
2349 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int whence
);
2351 extern int inode_init_always(struct super_block
*, struct inode
*);
2352 extern void inode_init_once(struct inode
*);
2353 extern void address_space_init_once(struct address_space
*mapping
);
2354 extern struct inode
* igrab(struct inode
*);
2355 extern ino_t
iunique(struct super_block
*, ino_t
);
2356 extern int inode_needs_sync(struct inode
*inode
);
2357 extern int generic_delete_inode(struct inode
*inode
);
2358 static inline int generic_drop_inode(struct inode
*inode
)
2360 return !inode
->i_nlink
|| inode_unhashed(inode
);
2363 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2364 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2366 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2367 int (*test
)(struct inode
*, void *), void *data
);
2368 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2370 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2371 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2372 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2373 extern int insert_inode_locked(struct inode
*);
2374 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2375 extern void lockdep_annotate_inode_mutex_key(struct inode
*inode
);
2377 static inline void lockdep_annotate_inode_mutex_key(struct inode
*inode
) { };
2379 extern void unlock_new_inode(struct inode
*);
2380 extern unsigned int get_next_ino(void);
2382 extern void __iget(struct inode
* inode
);
2383 extern void iget_failed(struct inode
*);
2384 extern void clear_inode(struct inode
*);
2385 extern void __destroy_inode(struct inode
*);
2386 extern struct inode
*new_inode_pseudo(struct super_block
*sb
);
2387 extern struct inode
*new_inode(struct super_block
*sb
);
2388 extern void free_inode_nonrcu(struct inode
*inode
);
2389 extern int should_remove_suid(struct dentry
*);
2390 extern int file_remove_suid(struct file
*);
2392 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2393 static inline void insert_inode_hash(struct inode
*inode
)
2395 __insert_inode_hash(inode
, inode
->i_ino
);
2398 extern void __remove_inode_hash(struct inode
*);
2399 static inline void remove_inode_hash(struct inode
*inode
)
2401 if (!inode_unhashed(inode
))
2402 __remove_inode_hash(inode
);
2405 extern void inode_sb_list_add(struct inode
*inode
);
2408 extern void submit_bio(int, struct bio
*);
2409 extern int bdev_read_only(struct block_device
*);
2411 extern int set_blocksize(struct block_device
*, int);
2412 extern int sb_set_blocksize(struct super_block
*, int);
2413 extern int sb_min_blocksize(struct super_block
*, int);
2415 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2416 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2417 extern int generic_file_remap_pages(struct vm_area_struct
*, unsigned long addr
,
2418 unsigned long size
, pgoff_t pgoff
);
2419 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
2420 extern ssize_t
generic_file_read_iter(struct kiocb
*, struct iov_iter
*);
2421 extern ssize_t
__generic_file_write_iter(struct kiocb
*, struct iov_iter
*);
2422 extern ssize_t
generic_file_write_iter(struct kiocb
*, struct iov_iter
*);
2423 extern ssize_t
generic_file_direct_write(struct kiocb
*, struct iov_iter
*, loff_t
);
2424 extern ssize_t
generic_perform_write(struct file
*, struct iov_iter
*, loff_t
);
2425 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2426 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2427 extern ssize_t
new_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2428 extern ssize_t
new_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2430 /* fs/block_dev.c */
2431 extern ssize_t
blkdev_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
);
2432 extern int blkdev_fsync(struct file
*filp
, loff_t start
, loff_t end
,
2434 extern void block_sync_page(struct page
*page
);
2437 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
2438 struct pipe_inode_info
*, size_t, unsigned int);
2439 extern ssize_t
default_file_splice_read(struct file
*, loff_t
*,
2440 struct pipe_inode_info
*, size_t, unsigned int);
2441 extern ssize_t
iter_file_splice_write(struct pipe_inode_info
*,
2442 struct file
*, loff_t
*, size_t, unsigned int);
2443 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
2444 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
2447 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
2448 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int whence
);
2449 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int whence
);
2450 extern loff_t
vfs_setpos(struct file
*file
, loff_t offset
, loff_t maxsize
);
2451 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int whence
);
2452 extern loff_t
generic_file_llseek_size(struct file
*file
, loff_t offset
,
2453 int whence
, loff_t maxsize
, loff_t eof
);
2454 extern loff_t
fixed_size_llseek(struct file
*file
, loff_t offset
,
2455 int whence
, loff_t size
);
2456 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
2457 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
2459 #ifdef CONFIG_FS_XIP
2460 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
2462 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
2463 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
2464 size_t len
, loff_t
*ppos
);
2465 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
2467 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
2474 typedef void (dio_submit_t
)(int rw
, struct bio
*bio
, struct inode
*inode
,
2475 loff_t file_offset
);
2478 /* need locking between buffered and direct access */
2481 /* filesystem does not support filling holes */
2482 DIO_SKIP_HOLES
= 0x02,
2484 /* filesystem can handle aio writes beyond i_size */
2485 DIO_ASYNC_EXTEND
= 0x04,
2488 void dio_end_io(struct bio
*bio
, int error
);
2490 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
2491 struct block_device
*bdev
, struct iov_iter
*iter
, loff_t offset
,
2492 get_block_t get_block
, dio_iodone_t end_io
,
2493 dio_submit_t submit_io
, int flags
);
2495 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2496 struct inode
*inode
, struct iov_iter
*iter
, loff_t offset
,
2497 get_block_t get_block
)
2499 return __blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iter
,
2500 offset
, get_block
, NULL
, NULL
,
2501 DIO_LOCKING
| DIO_SKIP_HOLES
);
2505 void inode_dio_wait(struct inode
*inode
);
2506 void inode_dio_done(struct inode
*inode
);
2508 extern void inode_set_flags(struct inode
*inode
, unsigned int flags
,
2511 extern const struct file_operations generic_ro_fops
;
2513 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2515 extern int readlink_copy(char __user
*, int, const char *);
2516 extern int page_readlink(struct dentry
*, char __user
*, int);
2517 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2518 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2519 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2521 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2522 extern const struct inode_operations page_symlink_inode_operations
;
2523 extern void kfree_put_link(struct dentry
*, struct nameidata
*, void *);
2524 extern int generic_readlink(struct dentry
*, char __user
*, int);
2525 extern void generic_fillattr(struct inode
*, struct kstat
*);
2526 int vfs_getattr_nosec(struct path
*path
, struct kstat
*stat
);
2527 extern int vfs_getattr(struct path
*, struct kstat
*);
2528 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2529 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2530 void __inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2531 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2532 loff_t
inode_get_bytes(struct inode
*inode
);
2533 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2535 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2536 extern int iterate_dir(struct file
*, struct dir_context
*);
2538 extern int vfs_stat(const char __user
*, struct kstat
*);
2539 extern int vfs_lstat(const char __user
*, struct kstat
*);
2540 extern int vfs_fstat(unsigned int, struct kstat
*);
2541 extern int vfs_fstatat(int , const char __user
*, struct kstat
*, int);
2543 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2545 extern int __generic_block_fiemap(struct inode
*inode
,
2546 struct fiemap_extent_info
*fieinfo
,
2547 loff_t start
, loff_t len
,
2548 get_block_t
*get_block
);
2549 extern int generic_block_fiemap(struct inode
*inode
,
2550 struct fiemap_extent_info
*fieinfo
, u64 start
,
2551 u64 len
, get_block_t
*get_block
);
2553 extern void get_filesystem(struct file_system_type
*fs
);
2554 extern void put_filesystem(struct file_system_type
*fs
);
2555 extern struct file_system_type
*get_fs_type(const char *name
);
2556 extern struct super_block
*get_super(struct block_device
*);
2557 extern struct super_block
*get_super_thawed(struct block_device
*);
2558 extern struct super_block
*get_active_super(struct block_device
*bdev
);
2559 extern void drop_super(struct super_block
*sb
);
2560 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
2561 extern void iterate_supers_type(struct file_system_type
*,
2562 void (*)(struct super_block
*, void *), void *);
2564 extern int dcache_dir_open(struct inode
*, struct file
*);
2565 extern int dcache_dir_close(struct inode
*, struct file
*);
2566 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2567 extern int dcache_readdir(struct file
*, struct dir_context
*);
2568 extern int simple_setattr(struct dentry
*, struct iattr
*);
2569 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2570 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2571 extern int simple_open(struct inode
*inode
, struct file
*file
);
2572 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2573 extern int simple_unlink(struct inode
*, struct dentry
*);
2574 extern int simple_rmdir(struct inode
*, struct dentry
*);
2575 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2576 extern int noop_fsync(struct file
*, loff_t
, loff_t
, int);
2577 extern int simple_empty(struct dentry
*);
2578 extern int simple_readpage(struct file
*file
, struct page
*page
);
2579 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2580 loff_t pos
, unsigned len
, unsigned flags
,
2581 struct page
**pagep
, void **fsdata
);
2582 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2583 loff_t pos
, unsigned len
, unsigned copied
,
2584 struct page
*page
, void *fsdata
);
2585 extern int always_delete_dentry(const struct dentry
*);
2586 extern struct inode
*alloc_anon_inode(struct super_block
*);
2587 extern const struct dentry_operations simple_dentry_operations
;
2589 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, unsigned int flags
);
2590 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2591 extern const struct file_operations simple_dir_operations
;
2592 extern const struct inode_operations simple_dir_inode_operations
;
2593 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2594 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2595 extern int simple_fill_super(struct super_block
*, unsigned long, struct tree_descr
*);
2596 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2597 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2599 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2600 loff_t
*ppos
, const void *from
, size_t available
);
2601 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
2602 const void __user
*from
, size_t count
);
2604 extern int __generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2605 extern int generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2607 extern int generic_check_addressable(unsigned, u64
);
2609 #ifdef CONFIG_MIGRATION
2610 extern int buffer_migrate_page(struct address_space
*,
2611 struct page
*, struct page
*,
2614 #define buffer_migrate_page NULL
2617 extern int inode_change_ok(const struct inode
*, struct iattr
*);
2618 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
2619 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
2621 extern int file_update_time(struct file
*file
);
2623 extern int generic_show_options(struct seq_file
*m
, struct dentry
*root
);
2624 extern void save_mount_options(struct super_block
*sb
, char *options
);
2625 extern void replace_mount_options(struct super_block
*sb
, char *options
);
2627 static inline ino_t
parent_ino(struct dentry
*dentry
)
2632 * Don't strictly need d_lock here? If the parent ino could change
2633 * then surely we'd have a deeper race in the caller?
2635 spin_lock(&dentry
->d_lock
);
2636 res
= dentry
->d_parent
->d_inode
->i_ino
;
2637 spin_unlock(&dentry
->d_lock
);
2641 /* Transaction based IO helpers */
2644 * An argresp is stored in an allocated page and holds the
2645 * size of the argument or response, along with its content
2647 struct simple_transaction_argresp
{
2652 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2654 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2656 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2657 size_t size
, loff_t
*pos
);
2658 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2660 void simple_transaction_set(struct file
*file
, size_t n
);
2663 * simple attribute files
2665 * These attributes behave similar to those in sysfs:
2667 * Writing to an attribute immediately sets a value, an open file can be
2668 * written to multiple times.
2670 * Reading from an attribute creates a buffer from the value that might get
2671 * read with multiple read calls. When the attribute has been read
2672 * completely, no further read calls are possible until the file is opened
2675 * All attributes contain a text representation of a numeric value
2676 * that are accessed with the get() and set() functions.
2678 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2679 static int __fops ## _open(struct inode *inode, struct file *file) \
2681 __simple_attr_check_format(__fmt, 0ull); \
2682 return simple_attr_open(inode, file, __get, __set, __fmt); \
2684 static const struct file_operations __fops = { \
2685 .owner = THIS_MODULE, \
2686 .open = __fops ## _open, \
2687 .release = simple_attr_release, \
2688 .read = simple_attr_read, \
2689 .write = simple_attr_write, \
2690 .llseek = generic_file_llseek, \
2693 static inline __printf(1, 2)
2694 void __simple_attr_check_format(const char *fmt
, ...)
2696 /* don't do anything, just let the compiler check the arguments; */
2699 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2700 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2702 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2703 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2704 size_t len
, loff_t
*ppos
);
2705 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2706 size_t len
, loff_t
*ppos
);
2709 int proc_nr_files(struct ctl_table
*table
, int write
,
2710 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2711 int proc_nr_dentry(struct ctl_table
*table
, int write
,
2712 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2713 int proc_nr_inodes(struct ctl_table
*table
, int write
,
2714 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2715 int __init
get_filesystem_list(char *buf
);
2717 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2718 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2720 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2721 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2722 (flag & __FMODE_NONOTIFY)))
2724 static inline int is_sxid(umode_t mode
)
2726 return (mode
& S_ISUID
) || ((mode
& S_ISGID
) && (mode
& S_IXGRP
));
2729 static inline void inode_has_no_xattr(struct inode
*inode
)
2731 if (!is_sxid(inode
->i_mode
) && (inode
->i_sb
->s_flags
& MS_NOSEC
))
2732 inode
->i_flags
|= S_NOSEC
;
2735 static inline bool dir_emit(struct dir_context
*ctx
,
2736 const char *name
, int namelen
,
2737 u64 ino
, unsigned type
)
2739 return ctx
->actor(ctx
, name
, namelen
, ctx
->pos
, ino
, type
) == 0;
2741 static inline bool dir_emit_dot(struct file
*file
, struct dir_context
*ctx
)
2743 return ctx
->actor(ctx
, ".", 1, ctx
->pos
,
2744 file
->f_path
.dentry
->d_inode
->i_ino
, DT_DIR
) == 0;
2746 static inline bool dir_emit_dotdot(struct file
*file
, struct dir_context
*ctx
)
2748 return ctx
->actor(ctx
, "..", 2, ctx
->pos
,
2749 parent_ino(file
->f_path
.dentry
), DT_DIR
) == 0;
2751 static inline bool dir_emit_dots(struct file
*file
, struct dir_context
*ctx
)
2753 if (ctx
->pos
== 0) {
2754 if (!dir_emit_dot(file
, ctx
))
2758 if (ctx
->pos
== 1) {
2759 if (!dir_emit_dotdot(file
, ctx
))
2765 static inline bool dir_relax(struct inode
*inode
)
2767 mutex_unlock(&inode
->i_mutex
);
2768 mutex_lock(&inode
->i_mutex
);
2769 return !IS_DEADDIR(inode
);
2772 #endif /* _LINUX_FS_H */