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 atomic_t 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 * If i_mmap_writable is negative, no new writable mappings are allowed. You
475 * can only deny writable mappings, if none exists right now.
477 static inline int mapping_writably_mapped(struct address_space
*mapping
)
479 return atomic_read(&mapping
->i_mmap_writable
) > 0;
482 static inline int mapping_map_writable(struct address_space
*mapping
)
484 return atomic_inc_unless_negative(&mapping
->i_mmap_writable
) ?
488 static inline void mapping_unmap_writable(struct address_space
*mapping
)
490 atomic_dec(&mapping
->i_mmap_writable
);
493 static inline int mapping_deny_writable(struct address_space
*mapping
)
495 return atomic_dec_unless_positive(&mapping
->i_mmap_writable
) ?
499 static inline void mapping_allow_writable(struct address_space
*mapping
)
501 atomic_inc(&mapping
->i_mmap_writable
);
505 * Use sequence counter to get consistent i_size on 32-bit processors.
507 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
508 #include <linux/seqlock.h>
509 #define __NEED_I_SIZE_ORDERED
510 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
512 #define i_size_ordered_init(inode) do { } while (0)
516 #define ACL_NOT_CACHED ((void *)(-1))
518 #define IOP_FASTPERM 0x0001
519 #define IOP_LOOKUP 0x0002
520 #define IOP_NOFOLLOW 0x0004
523 * Keep mostly read-only and often accessed (especially for
524 * the RCU path lookup and 'stat' data) fields at the beginning
525 * of the 'struct inode'
529 unsigned short i_opflags
;
532 unsigned int i_flags
;
534 #ifdef CONFIG_FS_POSIX_ACL
535 struct posix_acl
*i_acl
;
536 struct posix_acl
*i_default_acl
;
539 const struct inode_operations
*i_op
;
540 struct super_block
*i_sb
;
541 struct address_space
*i_mapping
;
543 #ifdef CONFIG_SECURITY
547 /* Stat data, not accessed from path walking */
550 * Filesystems may only read i_nlink directly. They shall use the
551 * following functions for modification:
553 * (set|clear|inc|drop)_nlink
554 * inode_(inc|dec)_link_count
557 const unsigned int i_nlink
;
558 unsigned int __i_nlink
;
562 struct timespec i_atime
;
563 struct timespec i_mtime
;
564 struct timespec i_ctime
;
565 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
566 unsigned short i_bytes
;
567 unsigned int i_blkbits
;
570 #ifdef __NEED_I_SIZE_ORDERED
571 seqcount_t i_size_seqcount
;
575 unsigned long i_state
;
576 struct mutex i_mutex
;
578 unsigned long dirtied_when
; /* jiffies of first dirtying */
580 struct hlist_node i_hash
;
581 struct list_head i_wb_list
; /* backing dev IO list */
582 struct list_head i_lru
; /* inode LRU list */
583 struct list_head i_sb_list
;
585 struct hlist_head i_dentry
;
586 struct rcu_head i_rcu
;
590 atomic_t i_dio_count
;
591 atomic_t i_writecount
;
593 atomic_t i_readcount
; /* struct files open RO */
595 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
596 struct file_lock
*i_flock
;
597 struct address_space i_data
;
599 struct dquot
*i_dquot
[MAXQUOTAS
];
601 struct list_head i_devices
;
603 struct pipe_inode_info
*i_pipe
;
604 struct block_device
*i_bdev
;
610 #ifdef CONFIG_FSNOTIFY
611 __u32 i_fsnotify_mask
; /* all events this inode cares about */
612 struct hlist_head i_fsnotify_marks
;
615 void *i_private
; /* fs or device private pointer */
618 static inline int inode_unhashed(struct inode
*inode
)
620 return hlist_unhashed(&inode
->i_hash
);
624 * inode->i_mutex nesting subclasses for the lock validator:
626 * 0: the object of the current VFS operation
630 * 4: second non-directory
631 * The last is for certain operations (such as rename) which lock two
632 * non-directories at once.
634 * The locking order between these classes is
635 * parent -> child -> normal -> xattr -> second non-directory
637 enum inode_i_mutex_lock_class
646 void lock_two_nondirectories(struct inode
*, struct inode
*);
647 void unlock_two_nondirectories(struct inode
*, struct inode
*);
650 * NOTE: in a 32bit arch with a preemptable kernel and
651 * an UP compile the i_size_read/write must be atomic
652 * with respect to the local cpu (unlike with preempt disabled),
653 * but they don't need to be atomic with respect to other cpus like in
654 * true SMP (so they need either to either locally disable irq around
655 * the read or for example on x86 they can be still implemented as a
656 * cmpxchg8b without the need of the lock prefix). For SMP compiles
657 * and 64bit archs it makes no difference if preempt is enabled or not.
659 static inline loff_t
i_size_read(const struct inode
*inode
)
661 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
666 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
667 i_size
= inode
->i_size
;
668 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
670 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
674 i_size
= inode
->i_size
;
678 return inode
->i_size
;
683 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
684 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
685 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
687 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
689 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
691 write_seqcount_begin(&inode
->i_size_seqcount
);
692 inode
->i_size
= i_size
;
693 write_seqcount_end(&inode
->i_size_seqcount
);
695 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
697 inode
->i_size
= i_size
;
700 inode
->i_size
= i_size
;
704 /* Helper functions so that in most cases filesystems will
705 * not need to deal directly with kuid_t and kgid_t and can
706 * instead deal with the raw numeric values that are stored
709 static inline uid_t
i_uid_read(const struct inode
*inode
)
711 return from_kuid(&init_user_ns
, inode
->i_uid
);
714 static inline gid_t
i_gid_read(const struct inode
*inode
)
716 return from_kgid(&init_user_ns
, inode
->i_gid
);
719 static inline void i_uid_write(struct inode
*inode
, uid_t uid
)
721 inode
->i_uid
= make_kuid(&init_user_ns
, uid
);
724 static inline void i_gid_write(struct inode
*inode
, gid_t gid
)
726 inode
->i_gid
= make_kgid(&init_user_ns
, gid
);
729 static inline unsigned iminor(const struct inode
*inode
)
731 return MINOR(inode
->i_rdev
);
734 static inline unsigned imajor(const struct inode
*inode
)
736 return MAJOR(inode
->i_rdev
);
739 extern struct block_device
*I_BDEV(struct inode
*inode
);
742 rwlock_t lock
; /* protects pid, uid, euid fields */
743 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
744 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
745 kuid_t uid
, euid
; /* uid/euid of process setting the owner */
746 int signum
; /* posix.1b rt signal to be delivered on IO */
750 * Track a single file's readahead state
752 struct file_ra_state
{
753 pgoff_t start
; /* where readahead started */
754 unsigned int size
; /* # of readahead pages */
755 unsigned int async_size
; /* do asynchronous readahead when
756 there are only # of pages ahead */
758 unsigned int ra_pages
; /* Maximum readahead window */
759 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
760 loff_t prev_pos
; /* Cache last read() position */
764 * Check if @index falls in the readahead windows.
766 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
768 return (index
>= ra
->start
&&
769 index
< ra
->start
+ ra
->size
);
774 struct llist_node fu_llist
;
775 struct rcu_head fu_rcuhead
;
778 #define f_dentry f_path.dentry
779 struct inode
*f_inode
; /* cached value */
780 const struct file_operations
*f_op
;
783 * Protects f_ep_links, f_flags.
784 * Must not be taken from IRQ context.
787 atomic_long_t f_count
;
788 unsigned int f_flags
;
790 struct mutex f_pos_lock
;
792 struct fown_struct f_owner
;
793 const struct cred
*f_cred
;
794 struct file_ra_state f_ra
;
797 #ifdef CONFIG_SECURITY
800 /* needed for tty driver, and maybe others */
804 /* Used by fs/eventpoll.c to link all the hooks to this file */
805 struct list_head f_ep_links
;
806 struct list_head f_tfile_llink
;
807 #endif /* #ifdef CONFIG_EPOLL */
808 struct address_space
*f_mapping
;
809 } __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */
814 /* file identifier */
815 unsigned char f_handle
[0];
818 static inline struct file
*get_file(struct file
*f
)
820 atomic_long_inc(&f
->f_count
);
823 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
824 #define file_count(x) atomic_long_read(&(x)->f_count)
826 #define MAX_NON_LFS ((1UL<<31) - 1)
828 /* Page cache limit. The filesystems should put that into their s_maxbytes
829 limits, otherwise bad things can happen in VM. */
830 #if BITS_PER_LONG==32
831 #define MAX_LFS_FILESIZE (((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
832 #elif BITS_PER_LONG==64
833 #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL)
838 #define FL_DELEG 4 /* NFSv4 delegation */
839 #define FL_ACCESS 8 /* not trying to lock, just looking */
840 #define FL_EXISTS 16 /* when unlocking, test for existence */
841 #define FL_LEASE 32 /* lease held on this file */
842 #define FL_CLOSE 64 /* unlock on close */
843 #define FL_SLEEP 128 /* A blocking lock */
844 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
845 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
846 #define FL_OFDLCK 1024 /* lock is "owned" by struct file */
849 * Special return value from posix_lock_file() and vfs_lock_file() for
850 * asynchronous locking.
852 #define FILE_LOCK_DEFERRED 1
855 * The POSIX file lock owner is determined by
856 * the "struct files_struct" in the thread group
857 * (or NULL for no owner - BSD locks).
859 * Lockd stuffs a "host" pointer into this.
861 typedef void *fl_owner_t
;
863 struct file_lock_operations
{
864 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
865 void (*fl_release_private
)(struct file_lock
*);
868 struct lock_manager_operations
{
869 int (*lm_compare_owner
)(struct file_lock
*, struct file_lock
*);
870 unsigned long (*lm_owner_key
)(struct file_lock
*);
871 void (*lm_notify
)(struct file_lock
*); /* unblock callback */
872 int (*lm_grant
)(struct file_lock
*, struct file_lock
*, int);
873 void (*lm_break
)(struct file_lock
*);
874 int (*lm_change
)(struct file_lock
**, int);
877 struct lock_manager
{
878 struct list_head list
;
882 void locks_start_grace(struct net
*, struct lock_manager
*);
883 void locks_end_grace(struct lock_manager
*);
884 int locks_in_grace(struct net
*);
886 /* that will die - we need it for nfs_lock_info */
887 #include <linux/nfs_fs_i.h>
890 * struct file_lock represents a generic "file lock". It's used to represent
891 * POSIX byte range locks, BSD (flock) locks, and leases. It's important to
892 * note that the same struct is used to represent both a request for a lock and
893 * the lock itself, but the same object is never used for both.
895 * FIXME: should we create a separate "struct lock_request" to help distinguish
898 * The i_flock list is ordered by:
900 * 1) lock type -- FL_LEASEs first, then FL_FLOCK, and finally FL_POSIX
902 * 3) lock range start
905 * Obviously, the last two criteria only matter for POSIX locks.
908 struct file_lock
*fl_next
; /* singly linked list for this inode */
909 struct hlist_node fl_link
; /* node in global lists */
910 struct list_head fl_block
; /* circular list of blocked processes */
912 unsigned int fl_flags
;
913 unsigned char fl_type
;
915 int fl_link_cpu
; /* what cpu's list is this on? */
916 struct pid
*fl_nspid
;
917 wait_queue_head_t fl_wait
;
918 struct file
*fl_file
;
922 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
923 /* for lease breaks: */
924 unsigned long fl_break_time
;
925 unsigned long fl_downgrade_time
;
927 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
928 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
930 struct nfs_lock_info nfs_fl
;
931 struct nfs4_lock_info nfs4_fl
;
933 struct list_head link
; /* link in AFS vnode's pending_locks list */
934 int state
; /* state of grant or error if -ve */
939 /* The following constant reflects the upper bound of the file/locking space */
941 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
942 #define OFFSET_MAX INT_LIMIT(loff_t)
943 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
946 #include <linux/fcntl.h>
948 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
950 #ifdef CONFIG_FILE_LOCKING
951 extern int fcntl_getlk(struct file
*, unsigned int, struct flock __user
*);
952 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
953 struct flock __user
*);
955 #if BITS_PER_LONG == 32
956 extern int fcntl_getlk64(struct file
*, unsigned int, struct flock64 __user
*);
957 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
958 struct flock64 __user
*);
961 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
962 extern int fcntl_getlease(struct file
*filp
);
965 void locks_free_lock(struct file_lock
*fl
);
966 extern void locks_init_lock(struct file_lock
*);
967 extern struct file_lock
* locks_alloc_lock(void);
968 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
969 extern void __locks_copy_lock(struct file_lock
*, const struct file_lock
*);
970 extern void locks_remove_posix(struct file
*, fl_owner_t
);
971 extern void locks_remove_file(struct file
*);
972 extern void locks_release_private(struct file_lock
*);
973 extern void posix_test_lock(struct file
*, struct file_lock
*);
974 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
975 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
976 extern int posix_unblock_lock(struct file_lock
*);
977 extern int vfs_test_lock(struct file
*, struct file_lock
*);
978 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
979 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
980 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
981 extern int __break_lease(struct inode
*inode
, unsigned int flags
, unsigned int type
);
982 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
983 extern int generic_setlease(struct file
*, long, struct file_lock
**);
984 extern int vfs_setlease(struct file
*, long, struct file_lock
**);
985 extern int lease_modify(struct file_lock
**, int);
986 extern int lock_may_read(struct inode
*, loff_t start
, unsigned long count
);
987 extern int lock_may_write(struct inode
*, loff_t start
, unsigned long count
);
988 #else /* !CONFIG_FILE_LOCKING */
989 static inline int fcntl_getlk(struct file
*file
, unsigned int cmd
,
990 struct flock __user
*user
)
995 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
996 unsigned int cmd
, struct flock __user
*user
)
1001 #if BITS_PER_LONG == 32
1002 static inline int fcntl_getlk64(struct file
*file
, unsigned int cmd
,
1003 struct flock64 __user
*user
)
1008 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1009 unsigned int cmd
, struct flock64 __user
*user
)
1014 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1019 static inline int fcntl_getlease(struct file
*filp
)
1024 static inline void locks_init_lock(struct file_lock
*fl
)
1029 static inline void __locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1034 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1039 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1044 static inline void locks_remove_file(struct file
*filp
)
1049 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1054 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1055 struct file_lock
*conflock
)
1060 static inline int posix_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1065 static inline int posix_unblock_lock(struct file_lock
*waiter
)
1070 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1075 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1076 struct file_lock
*fl
, struct file_lock
*conf
)
1081 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1086 static inline int flock_lock_file_wait(struct file
*filp
,
1087 struct file_lock
*request
)
1092 static inline int __break_lease(struct inode
*inode
, unsigned int mode
, unsigned int type
)
1097 static inline void lease_get_mtime(struct inode
*inode
, struct timespec
*time
)
1102 static inline int generic_setlease(struct file
*filp
, long arg
,
1103 struct file_lock
**flp
)
1108 static inline int vfs_setlease(struct file
*filp
, long arg
,
1109 struct file_lock
**lease
)
1114 static inline int lease_modify(struct file_lock
**before
, int arg
)
1119 static inline int lock_may_read(struct inode
*inode
, loff_t start
,
1125 static inline int lock_may_write(struct inode
*inode
, loff_t start
,
1130 #endif /* !CONFIG_FILE_LOCKING */
1133 struct fasync_struct
{
1137 struct fasync_struct
*fa_next
; /* singly linked list */
1138 struct file
*fa_file
;
1139 struct rcu_head fa_rcu
;
1142 #define FASYNC_MAGIC 0x4601
1144 /* SMP safe fasync helpers: */
1145 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1146 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1147 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1148 extern struct fasync_struct
*fasync_alloc(void);
1149 extern void fasync_free(struct fasync_struct
*);
1151 /* can be called from interrupts */
1152 extern void kill_fasync(struct fasync_struct
**, int, int);
1154 extern int __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1155 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1156 extern void f_delown(struct file
*filp
);
1157 extern pid_t
f_getown(struct file
*filp
);
1158 extern int send_sigurg(struct fown_struct
*fown
);
1166 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1167 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1168 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1169 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1170 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1172 extern struct list_head super_blocks
;
1173 extern spinlock_t sb_lock
;
1175 /* Possible states of 'frozen' field */
1177 SB_UNFROZEN
= 0, /* FS is unfrozen */
1178 SB_FREEZE_WRITE
= 1, /* Writes, dir ops, ioctls frozen */
1179 SB_FREEZE_PAGEFAULT
= 2, /* Page faults stopped as well */
1180 SB_FREEZE_FS
= 3, /* For internal FS use (e.g. to stop
1181 * internal threads if needed) */
1182 SB_FREEZE_COMPLETE
= 4, /* ->freeze_fs finished successfully */
1185 #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
1188 /* Counters for counting writers at each level */
1189 struct percpu_counter counter
[SB_FREEZE_LEVELS
];
1190 wait_queue_head_t wait
; /* queue for waiting for
1191 writers / faults to finish */
1192 int frozen
; /* Is sb frozen? */
1193 wait_queue_head_t wait_unfrozen
; /* queue for waiting for
1195 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1196 struct lockdep_map lock_map
[SB_FREEZE_LEVELS
];
1200 struct super_block
{
1201 struct list_head s_list
; /* Keep this first */
1202 dev_t s_dev
; /* search index; _not_ kdev_t */
1203 unsigned char s_blocksize_bits
;
1204 unsigned long s_blocksize
;
1205 loff_t s_maxbytes
; /* Max file size */
1206 struct file_system_type
*s_type
;
1207 const struct super_operations
*s_op
;
1208 const struct dquot_operations
*dq_op
;
1209 const struct quotactl_ops
*s_qcop
;
1210 const struct export_operations
*s_export_op
;
1211 unsigned long s_flags
;
1212 unsigned long s_magic
;
1213 struct dentry
*s_root
;
1214 struct rw_semaphore s_umount
;
1217 #ifdef CONFIG_SECURITY
1220 const struct xattr_handler
**s_xattr
;
1222 struct list_head s_inodes
; /* all inodes */
1223 struct hlist_bl_head s_anon
; /* anonymous dentries for (nfs) exporting */
1224 struct list_head s_mounts
; /* list of mounts; _not_ for fs use */
1225 struct block_device
*s_bdev
;
1226 struct backing_dev_info
*s_bdi
;
1227 struct mtd_info
*s_mtd
;
1228 struct hlist_node s_instances
;
1229 struct quota_info s_dquot
; /* Diskquota specific options */
1231 struct sb_writers s_writers
;
1233 char s_id
[32]; /* Informational name */
1234 u8 s_uuid
[16]; /* UUID */
1236 void *s_fs_info
; /* Filesystem private info */
1237 unsigned int s_max_links
;
1240 /* Granularity of c/m/atime in ns.
1241 Cannot be worse than a second */
1245 * The next field is for VFS *only*. No filesystems have any business
1246 * even looking at it. You had been warned.
1248 struct mutex s_vfs_rename_mutex
; /* Kludge */
1251 * Filesystem subtype. If non-empty the filesystem type field
1252 * in /proc/mounts will be "type.subtype"
1257 * Saved mount options for lazy filesystems using
1258 * generic_show_options()
1260 char __rcu
*s_options
;
1261 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1264 * Saved pool identifier for cleancache (-1 means none)
1266 int cleancache_poolid
;
1268 struct shrinker s_shrink
; /* per-sb shrinker handle */
1270 /* Number of inodes with nlink == 0 but still referenced */
1271 atomic_long_t s_remove_count
;
1273 /* Being remounted read-only */
1274 int s_readonly_remount
;
1276 /* AIO completions deferred from interrupt context */
1277 struct workqueue_struct
*s_dio_done_wq
;
1278 struct hlist_head s_pins
;
1281 * Keep the lru lists last in the structure so they always sit on their
1282 * own individual cachelines.
1284 struct list_lru s_dentry_lru ____cacheline_aligned_in_smp
;
1285 struct list_lru s_inode_lru ____cacheline_aligned_in_smp
;
1286 struct rcu_head rcu
;
1289 extern struct timespec
current_fs_time(struct super_block
*sb
);
1292 * Snapshotting support.
1295 void __sb_end_write(struct super_block
*sb
, int level
);
1296 int __sb_start_write(struct super_block
*sb
, int level
, bool wait
);
1299 * sb_end_write - drop write access to a superblock
1300 * @sb: the super we wrote to
1302 * Decrement number of writers to the filesystem. Wake up possible waiters
1303 * wanting to freeze the filesystem.
1305 static inline void sb_end_write(struct super_block
*sb
)
1307 __sb_end_write(sb
, SB_FREEZE_WRITE
);
1311 * sb_end_pagefault - drop write access to a superblock from a page fault
1312 * @sb: the super we wrote to
1314 * Decrement number of processes handling write page fault to the filesystem.
1315 * Wake up possible waiters wanting to freeze the filesystem.
1317 static inline void sb_end_pagefault(struct super_block
*sb
)
1319 __sb_end_write(sb
, SB_FREEZE_PAGEFAULT
);
1323 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
1324 * @sb: the super we wrote to
1326 * Decrement fs-internal number of writers to the filesystem. Wake up possible
1327 * waiters wanting to freeze the filesystem.
1329 static inline void sb_end_intwrite(struct super_block
*sb
)
1331 __sb_end_write(sb
, SB_FREEZE_FS
);
1335 * sb_start_write - get write access to a superblock
1336 * @sb: the super we write to
1338 * When a process wants to write data or metadata to a file system (i.e. dirty
1339 * a page or an inode), it should embed the operation in a sb_start_write() -
1340 * sb_end_write() pair to get exclusion against file system freezing. This
1341 * function increments number of writers preventing freezing. If the file
1342 * system is already frozen, the function waits until the file system is
1345 * Since freeze protection behaves as a lock, users have to preserve
1346 * ordering of freeze protection and other filesystem locks. Generally,
1347 * freeze protection should be the outermost lock. In particular, we have:
1350 * -> i_mutex (write path, truncate, directory ops, ...)
1351 * -> s_umount (freeze_super, thaw_super)
1353 static inline void sb_start_write(struct super_block
*sb
)
1355 __sb_start_write(sb
, SB_FREEZE_WRITE
, true);
1358 static inline int sb_start_write_trylock(struct super_block
*sb
)
1360 return __sb_start_write(sb
, SB_FREEZE_WRITE
, false);
1364 * sb_start_pagefault - get write access to a superblock from a page fault
1365 * @sb: the super we write to
1367 * When a process starts handling write page fault, it should embed the
1368 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
1369 * exclusion against file system freezing. This is needed since the page fault
1370 * is going to dirty a page. This function increments number of running page
1371 * faults preventing freezing. If the file system is already frozen, the
1372 * function waits until the file system is thawed.
1374 * Since page fault freeze protection behaves as a lock, users have to preserve
1375 * ordering of freeze protection and other filesystem locks. It is advised to
1376 * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
1377 * handling code implies lock dependency:
1380 * -> sb_start_pagefault
1382 static inline void sb_start_pagefault(struct super_block
*sb
)
1384 __sb_start_write(sb
, SB_FREEZE_PAGEFAULT
, true);
1388 * sb_start_intwrite - get write access to a superblock for internal fs purposes
1389 * @sb: the super we write to
1391 * This is the third level of protection against filesystem freezing. It is
1392 * free for use by a filesystem. The only requirement is that it must rank
1393 * below sb_start_pagefault.
1395 * For example filesystem can call sb_start_intwrite() when starting a
1396 * transaction which somewhat eases handling of freezing for internal sources
1397 * of filesystem changes (internal fs threads, discarding preallocation on file
1400 static inline void sb_start_intwrite(struct super_block
*sb
)
1402 __sb_start_write(sb
, SB_FREEZE_FS
, true);
1406 extern bool inode_owner_or_capable(const struct inode
*inode
);
1409 * VFS helper functions..
1411 extern int vfs_create(struct inode
*, struct dentry
*, umode_t
, bool);
1412 extern int vfs_mkdir(struct inode
*, struct dentry
*, umode_t
);
1413 extern int vfs_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
1414 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1415 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*, struct inode
**);
1416 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1417 extern int vfs_unlink(struct inode
*, struct dentry
*, struct inode
**);
1418 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*, struct inode
**, unsigned int);
1421 * VFS dentry helper functions.
1423 extern void dentry_unhash(struct dentry
*dentry
);
1426 * VFS file helper functions.
1428 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1431 * VFS FS_IOC_FIEMAP helper definitions.
1433 struct fiemap_extent_info
{
1434 unsigned int fi_flags
; /* Flags as passed from user */
1435 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1436 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1437 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1438 fiemap_extent array */
1440 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1441 u64 phys
, u64 len
, u32 flags
);
1442 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1447 * NOTE! These match bits 12..15 of stat.st_mode
1448 * (ie "(i_mode >> 12) & 15").
1450 #define DT_UNKNOWN 0
1461 * This is the "filldir" function type, used by readdir() to let
1462 * the kernel specify what kind of dirent layout it wants to have.
1463 * This allows the kernel to read directories into kernel space or
1464 * to have different dirent layouts depending on the binary type.
1466 typedef int (*filldir_t
)(void *, const char *, int, loff_t
, u64
, unsigned);
1467 struct dir_context
{
1468 const filldir_t actor
;
1472 struct block_device_operations
;
1474 /* These macros are for out of kernel modules to test that
1475 * the kernel supports the unlocked_ioctl and compat_ioctl
1476 * fields in struct file_operations. */
1477 #define HAVE_COMPAT_IOCTL 1
1478 #define HAVE_UNLOCKED_IOCTL 1
1482 struct file_operations
{
1483 struct module
*owner
;
1484 loff_t (*llseek
) (struct file
*, loff_t
, int);
1485 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1486 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1487 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1488 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1489 ssize_t (*read_iter
) (struct kiocb
*, struct iov_iter
*);
1490 ssize_t (*write_iter
) (struct kiocb
*, struct iov_iter
*);
1491 int (*iterate
) (struct file
*, struct dir_context
*);
1492 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1493 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1494 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1495 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1496 int (*open
) (struct inode
*, struct file
*);
1497 int (*flush
) (struct file
*, fl_owner_t id
);
1498 int (*release
) (struct inode
*, struct file
*);
1499 int (*fsync
) (struct file
*, loff_t
, loff_t
, int datasync
);
1500 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1501 int (*fasync
) (int, struct file
*, int);
1502 int (*lock
) (struct file
*, int, struct file_lock
*);
1503 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1504 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1505 int (*check_flags
)(int);
1506 int (*flock
) (struct file
*, int, struct file_lock
*);
1507 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1508 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1509 int (*setlease
)(struct file
*, long, struct file_lock
**);
1510 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1512 int (*show_fdinfo
)(struct seq_file
*m
, struct file
*f
);
1515 struct inode_operations
{
1516 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, unsigned int);
1517 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1518 int (*permission
) (struct inode
*, int);
1519 struct posix_acl
* (*get_acl
)(struct inode
*, int);
1521 int (*readlink
) (struct dentry
*, char __user
*,int);
1522 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1524 int (*create
) (struct inode
*,struct dentry
*, umode_t
, bool);
1525 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1526 int (*unlink
) (struct inode
*,struct dentry
*);
1527 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1528 int (*mkdir
) (struct inode
*,struct dentry
*,umode_t
);
1529 int (*rmdir
) (struct inode
*,struct dentry
*);
1530 int (*mknod
) (struct inode
*,struct dentry
*,umode_t
,dev_t
);
1531 int (*rename
) (struct inode
*, struct dentry
*,
1532 struct inode
*, struct dentry
*);
1533 int (*rename2
) (struct inode
*, struct dentry
*,
1534 struct inode
*, struct dentry
*, unsigned int);
1535 int (*setattr
) (struct dentry
*, struct iattr
*);
1536 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1537 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1538 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1539 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1540 int (*removexattr
) (struct dentry
*, const char *);
1541 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1543 int (*update_time
)(struct inode
*, struct timespec
*, int);
1544 int (*atomic_open
)(struct inode
*, struct dentry
*,
1545 struct file
*, unsigned open_flag
,
1546 umode_t create_mode
, int *opened
);
1547 int (*tmpfile
) (struct inode
*, struct dentry
*, umode_t
);
1548 int (*set_acl
)(struct inode
*, struct posix_acl
*, int);
1549 } ____cacheline_aligned
;
1551 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1552 unsigned long nr_segs
, unsigned long fast_segs
,
1553 struct iovec
*fast_pointer
,
1554 struct iovec
**ret_pointer
);
1556 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1557 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1558 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1559 unsigned long, loff_t
*);
1560 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1561 unsigned long, loff_t
*);
1563 struct super_operations
{
1564 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1565 void (*destroy_inode
)(struct inode
*);
1567 void (*dirty_inode
) (struct inode
*, int flags
);
1568 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1569 int (*drop_inode
) (struct inode
*);
1570 void (*evict_inode
) (struct inode
*);
1571 void (*put_super
) (struct super_block
*);
1572 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1573 int (*freeze_fs
) (struct super_block
*);
1574 int (*unfreeze_fs
) (struct super_block
*);
1575 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1576 int (*remount_fs
) (struct super_block
*, int *, char *);
1577 void (*umount_begin
) (struct super_block
*);
1579 int (*show_options
)(struct seq_file
*, struct dentry
*);
1580 int (*show_devname
)(struct seq_file
*, struct dentry
*);
1581 int (*show_path
)(struct seq_file
*, struct dentry
*);
1582 int (*show_stats
)(struct seq_file
*, struct dentry
*);
1584 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1585 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1587 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1588 long (*nr_cached_objects
)(struct super_block
*, int);
1589 long (*free_cached_objects
)(struct super_block
*, long, int);
1593 * Inode flags - they have no relation to superblock flags now
1595 #define S_SYNC 1 /* Writes are synced at once */
1596 #define S_NOATIME 2 /* Do not update access times */
1597 #define S_APPEND 4 /* Append-only file */
1598 #define S_IMMUTABLE 8 /* Immutable file */
1599 #define S_DEAD 16 /* removed, but still open directory */
1600 #define S_NOQUOTA 32 /* Inode is not counted to quota */
1601 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
1602 #define S_NOCMTIME 128 /* Do not update file c/mtime */
1603 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
1604 #define S_PRIVATE 512 /* Inode is fs-internal */
1605 #define S_IMA 1024 /* Inode has an associated IMA struct */
1606 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
1607 #define S_NOSEC 4096 /* no suid or xattr security attributes */
1610 * Note that nosuid etc flags are inode-specific: setting some file-system
1611 * flags just means all the inodes inherit those flags by default. It might be
1612 * possible to override it selectively if you really wanted to with some
1613 * ioctl() that is not currently implemented.
1615 * Exception: MS_RDONLY is always applied to the entire file system.
1617 * Unfortunately, it is possible to change a filesystems flags with it mounted
1618 * with files in use. This means that all of the inodes will not have their
1619 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
1620 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
1622 #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg))
1624 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
1625 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
1626 ((inode)->i_flags & S_SYNC))
1627 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
1628 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
1629 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
1630 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
1631 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
1633 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
1634 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
1635 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
1636 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
1638 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
1639 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
1640 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
1641 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
1642 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
1643 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
1644 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
1647 * Inode state bits. Protected by inode->i_lock
1649 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1650 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1652 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1653 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1654 * various stages of removing an inode.
1656 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1658 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1659 * fdatasync(). i_atime is the usual cause.
1660 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1661 * these changes separately from I_DIRTY_SYNC so that we
1662 * don't have to write inode on fdatasync() when only
1663 * mtime has changed in it.
1664 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1665 * I_NEW Serves as both a mutex and completion notification.
1666 * New inodes set I_NEW. If two processes both create
1667 * the same inode, one of them will release its inode and
1668 * wait for I_NEW to be released before returning.
1669 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1670 * also cause waiting on I_NEW, without I_NEW actually
1671 * being set. find_inode() uses this to prevent returning
1672 * nearly-dead inodes.
1673 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1674 * is zero. I_FREEING must be set when I_WILL_FREE is
1676 * I_FREEING Set when inode is about to be freed but still has dirty
1677 * pages or buffers attached or the inode itself is still
1679 * I_CLEAR Added by clear_inode(). In this state the inode is
1680 * clean and can be destroyed. Inode keeps I_FREEING.
1682 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1683 * prohibited for many purposes. iget() must wait for
1684 * the inode to be completely released, then create it
1685 * anew. Other functions will just ignore such inodes,
1686 * if appropriate. I_NEW is used for waiting.
1688 * I_SYNC Writeback of inode is running. The bit is set during
1689 * data writeback, and cleared with a wakeup on the bit
1690 * address once it is done. The bit is also used to pin
1691 * the inode in memory for flusher thread.
1693 * I_REFERENCED Marks the inode as recently references on the LRU list.
1695 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1697 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1699 #define I_DIRTY_SYNC (1 << 0)
1700 #define I_DIRTY_DATASYNC (1 << 1)
1701 #define I_DIRTY_PAGES (1 << 2)
1703 #define I_NEW (1 << __I_NEW)
1704 #define I_WILL_FREE (1 << 4)
1705 #define I_FREEING (1 << 5)
1706 #define I_CLEAR (1 << 6)
1708 #define I_SYNC (1 << __I_SYNC)
1709 #define I_REFERENCED (1 << 8)
1710 #define __I_DIO_WAKEUP 9
1711 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1712 #define I_LINKABLE (1 << 10)
1714 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1716 extern void __mark_inode_dirty(struct inode
*, int);
1717 static inline void mark_inode_dirty(struct inode
*inode
)
1719 __mark_inode_dirty(inode
, I_DIRTY
);
1722 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1724 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1727 extern void inc_nlink(struct inode
*inode
);
1728 extern void drop_nlink(struct inode
*inode
);
1729 extern void clear_nlink(struct inode
*inode
);
1730 extern void set_nlink(struct inode
*inode
, unsigned int nlink
);
1732 static inline void inode_inc_link_count(struct inode
*inode
)
1735 mark_inode_dirty(inode
);
1738 static inline void inode_dec_link_count(struct inode
*inode
)
1741 mark_inode_dirty(inode
);
1745 * inode_inc_iversion - increments i_version
1746 * @inode: inode that need to be updated
1748 * Every time the inode is modified, the i_version field will be incremented.
1749 * The filesystem has to be mounted with i_version flag
1752 static inline void inode_inc_iversion(struct inode
*inode
)
1754 spin_lock(&inode
->i_lock
);
1756 spin_unlock(&inode
->i_lock
);
1759 enum file_time_flags
{
1766 extern void touch_atime(const struct path
*);
1767 static inline void file_accessed(struct file
*file
)
1769 if (!(file
->f_flags
& O_NOATIME
))
1770 touch_atime(&file
->f_path
);
1773 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1774 int sync_inode_metadata(struct inode
*inode
, int wait
);
1776 struct file_system_type
{
1779 #define FS_REQUIRES_DEV 1
1780 #define FS_BINARY_MOUNTDATA 2
1781 #define FS_HAS_SUBTYPE 4
1782 #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */
1783 #define FS_USERNS_DEV_MOUNT 16 /* A userns mount does not imply MNT_NODEV */
1784 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */
1785 struct dentry
*(*mount
) (struct file_system_type
*, int,
1786 const char *, void *);
1787 void (*kill_sb
) (struct super_block
*);
1788 struct module
*owner
;
1789 struct file_system_type
* next
;
1790 struct hlist_head fs_supers
;
1792 struct lock_class_key s_lock_key
;
1793 struct lock_class_key s_umount_key
;
1794 struct lock_class_key s_vfs_rename_key
;
1795 struct lock_class_key s_writers_key
[SB_FREEZE_LEVELS
];
1797 struct lock_class_key i_lock_key
;
1798 struct lock_class_key i_mutex_key
;
1799 struct lock_class_key i_mutex_dir_key
;
1802 #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)
1804 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
, int flags
,
1805 void *data
, int (*fill_super
)(struct super_block
*, void *, int));
1806 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
1807 int flags
, const char *dev_name
, void *data
,
1808 int (*fill_super
)(struct super_block
*, void *, int));
1809 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
1810 int flags
, void *data
,
1811 int (*fill_super
)(struct super_block
*, void *, int));
1812 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
1813 int flags
, void *data
,
1814 int (*fill_super
)(struct super_block
*, void *, int));
1815 extern struct dentry
*mount_subtree(struct vfsmount
*mnt
, const char *path
);
1816 void generic_shutdown_super(struct super_block
*sb
);
1817 void kill_block_super(struct super_block
*sb
);
1818 void kill_anon_super(struct super_block
*sb
);
1819 void kill_litter_super(struct super_block
*sb
);
1820 void deactivate_super(struct super_block
*sb
);
1821 void deactivate_locked_super(struct super_block
*sb
);
1822 int set_anon_super(struct super_block
*s
, void *data
);
1823 int get_anon_bdev(dev_t
*);
1824 void free_anon_bdev(dev_t
);
1825 struct super_block
*sget(struct file_system_type
*type
,
1826 int (*test
)(struct super_block
*,void *),
1827 int (*set
)(struct super_block
*,void *),
1828 int flags
, void *data
);
1829 extern struct dentry
*mount_pseudo(struct file_system_type
*, char *,
1830 const struct super_operations
*ops
,
1831 const struct dentry_operations
*dops
,
1834 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1835 #define fops_get(fops) \
1836 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1837 #define fops_put(fops) \
1838 do { if (fops) module_put((fops)->owner); } while(0)
1840 * This one is to be used *ONLY* from ->open() instances.
1841 * fops must be non-NULL, pinned down *and* module dependencies
1842 * should be sufficient to pin the caller down as well.
1844 #define replace_fops(f, fops) \
1846 struct file *__file = (f); \
1847 fops_put(__file->f_op); \
1848 BUG_ON(!(__file->f_op = (fops))); \
1851 extern int register_filesystem(struct file_system_type
*);
1852 extern int unregister_filesystem(struct file_system_type
*);
1853 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
1854 #define kern_mount(type) kern_mount_data(type, NULL)
1855 extern void kern_unmount(struct vfsmount
*mnt
);
1856 extern int may_umount_tree(struct vfsmount
*);
1857 extern int may_umount(struct vfsmount
*);
1858 extern long do_mount(const char *, const char *, const char *, unsigned long, void *);
1859 extern struct vfsmount
*collect_mounts(struct path
*);
1860 extern void drop_collected_mounts(struct vfsmount
*);
1861 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
1863 extern int vfs_statfs(struct path
*, struct kstatfs
*);
1864 extern int user_statfs(const char __user
*, struct kstatfs
*);
1865 extern int fd_statfs(int, struct kstatfs
*);
1866 extern int vfs_ustat(dev_t
, struct kstatfs
*);
1867 extern int freeze_super(struct super_block
*super
);
1868 extern int thaw_super(struct super_block
*super
);
1869 extern bool our_mnt(struct vfsmount
*mnt
);
1870 extern bool fs_fully_visible(struct file_system_type
*);
1872 extern int current_umask(void);
1874 extern void ihold(struct inode
* inode
);
1875 extern void iput(struct inode
*);
1877 static inline struct inode
*file_inode(struct file
*f
)
1883 extern struct kobject
*fs_kobj
;
1885 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1887 #define FLOCK_VERIFY_READ 1
1888 #define FLOCK_VERIFY_WRITE 2
1890 #ifdef CONFIG_FILE_LOCKING
1891 extern int locks_mandatory_locked(struct file
*);
1892 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1895 * Candidates for mandatory locking have the setgid bit set
1896 * but no group execute bit - an otherwise meaningless combination.
1899 static inline int __mandatory_lock(struct inode
*ino
)
1901 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
1905 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1906 * otherwise these will be advisory locks
1909 static inline int mandatory_lock(struct inode
*ino
)
1911 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
1914 static inline int locks_verify_locked(struct file
*file
)
1916 if (mandatory_lock(file_inode(file
)))
1917 return locks_mandatory_locked(file
);
1921 static inline int locks_verify_truncate(struct inode
*inode
,
1925 if (inode
->i_flock
&& mandatory_lock(inode
))
1926 return locks_mandatory_area(
1927 FLOCK_VERIFY_WRITE
, inode
, filp
,
1928 size
< inode
->i_size
? size
: inode
->i_size
,
1929 (size
< inode
->i_size
? inode
->i_size
- size
1930 : size
- inode
->i_size
)
1935 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1938 * Since this check is lockless, we must ensure that any refcounts
1939 * taken are done before checking inode->i_flock. Otherwise, we could
1940 * end up racing with tasks trying to set a new lease on this file.
1944 return __break_lease(inode
, mode
, FL_LEASE
);
1948 static inline int break_deleg(struct inode
*inode
, unsigned int mode
)
1951 * Since this check is lockless, we must ensure that any refcounts
1952 * taken are done before checking inode->i_flock. Otherwise, we could
1953 * end up racing with tasks trying to set a new lease on this file.
1957 return __break_lease(inode
, mode
, FL_DELEG
);
1961 static inline int try_break_deleg(struct inode
*inode
, struct inode
**delegated_inode
)
1965 ret
= break_deleg(inode
, O_WRONLY
|O_NONBLOCK
);
1966 if (ret
== -EWOULDBLOCK
&& delegated_inode
) {
1967 *delegated_inode
= inode
;
1973 static inline int break_deleg_wait(struct inode
**delegated_inode
)
1977 ret
= break_deleg(*delegated_inode
, O_WRONLY
);
1978 iput(*delegated_inode
);
1979 *delegated_inode
= NULL
;
1983 #else /* !CONFIG_FILE_LOCKING */
1984 static inline int locks_mandatory_locked(struct file
*file
)
1989 static inline int locks_mandatory_area(int rw
, struct inode
*inode
,
1990 struct file
*filp
, loff_t offset
,
1996 static inline int __mandatory_lock(struct inode
*inode
)
2001 static inline int mandatory_lock(struct inode
*inode
)
2006 static inline int locks_verify_locked(struct file
*file
)
2011 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
2017 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2022 static inline int break_deleg(struct inode
*inode
, unsigned int mode
)
2027 static inline int try_break_deleg(struct inode
*inode
, struct inode
**delegated_inode
)
2032 static inline int break_deleg_wait(struct inode
**delegated_inode
)
2038 #endif /* CONFIG_FILE_LOCKING */
2043 const char *name
; /* pointer to actual string */
2044 const __user
char *uptr
; /* original userland pointer */
2045 struct audit_names
*aname
;
2046 bool separate
; /* should "name" be freed? */
2049 extern long vfs_truncate(struct path
*, loff_t
);
2050 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
2052 extern int do_fallocate(struct file
*file
, int mode
, loff_t offset
,
2054 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
2056 extern struct file
*file_open_name(struct filename
*, int, umode_t
);
2057 extern struct file
*filp_open(const char *, int, umode_t
);
2058 extern struct file
*file_open_root(struct dentry
*, struct vfsmount
*,
2060 extern struct file
* dentry_open(const struct path
*, int, const struct cred
*);
2061 extern int filp_close(struct file
*, fl_owner_t id
);
2063 extern struct filename
*getname(const char __user
*);
2064 extern struct filename
*getname_kernel(const char *);
2070 extern int finish_open(struct file
*file
, struct dentry
*dentry
,
2071 int (*open
)(struct inode
*, struct file
*),
2073 extern int finish_no_open(struct file
*file
, struct dentry
*dentry
);
2077 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
2080 extern void __init
vfs_caches_init_early(void);
2081 extern void __init
vfs_caches_init(unsigned long);
2083 extern struct kmem_cache
*names_cachep
;
2085 extern void final_putname(struct filename
*name
);
2087 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
2088 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2089 #ifndef CONFIG_AUDITSYSCALL
2090 #define putname(name) final_putname(name)
2092 extern void putname(struct filename
*name
);
2096 extern int register_blkdev(unsigned int, const char *);
2097 extern void unregister_blkdev(unsigned int, const char *);
2098 extern struct block_device
*bdget(dev_t
);
2099 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2100 extern void bd_set_size(struct block_device
*, loff_t size
);
2101 extern void bd_forget(struct inode
*inode
);
2102 extern void bdput(struct block_device
*);
2103 extern void invalidate_bdev(struct block_device
*);
2104 extern void iterate_bdevs(void (*)(struct block_device
*, void *), void *);
2105 extern int sync_blockdev(struct block_device
*bdev
);
2106 extern void kill_bdev(struct block_device
*);
2107 extern struct super_block
*freeze_bdev(struct block_device
*);
2108 extern void emergency_thaw_all(void);
2109 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2110 extern int fsync_bdev(struct block_device
*);
2111 extern int sb_is_blkdev_sb(struct super_block
*sb
);
2113 static inline void bd_forget(struct inode
*inode
) {}
2114 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2115 static inline void kill_bdev(struct block_device
*bdev
) {}
2116 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2118 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2123 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2128 static inline void iterate_bdevs(void (*f
)(struct block_device
*, void *), void *arg
)
2132 static inline int sb_is_blkdev_sb(struct super_block
*sb
)
2137 extern int sync_filesystem(struct super_block
*);
2138 extern const struct file_operations def_blk_fops
;
2139 extern const struct file_operations def_chr_fops
;
2140 extern const struct file_operations bad_sock_fops
;
2142 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2143 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2144 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2145 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2146 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2148 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2150 extern void blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2152 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2153 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2154 struct gendisk
*disk
);
2156 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2157 struct gendisk
*disk
)
2161 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2162 struct gendisk
*disk
)
2169 #define CHRDEV_MAJOR_HASH_SIZE 255
2170 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2171 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2172 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2173 unsigned int count
, const char *name
,
2174 const struct file_operations
*fops
);
2175 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2176 unsigned int count
, const char *name
);
2177 extern void unregister_chrdev_region(dev_t
, unsigned);
2178 extern void chrdev_show(struct seq_file
*,off_t
);
2180 static inline int register_chrdev(unsigned int major
, const char *name
,
2181 const struct file_operations
*fops
)
2183 return __register_chrdev(major
, 0, 256, name
, fops
);
2186 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2188 __unregister_chrdev(major
, 0, 256, name
);
2191 /* fs/block_dev.c */
2192 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2193 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2196 #define BLKDEV_MAJOR_HASH_SIZE 255
2197 extern const char *__bdevname(dev_t
, char *buffer
);
2198 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2199 extern struct block_device
*lookup_bdev(const char *);
2200 extern void blkdev_show(struct seq_file
*,off_t
);
2203 #define BLKDEV_MAJOR_HASH_SIZE 0
2206 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2208 /* Invalid inode operations -- fs/bad_inode.c */
2209 extern void make_bad_inode(struct inode
*);
2210 extern int is_bad_inode(struct inode
*);
2214 * return READ, READA, or WRITE
2216 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2219 * return data direction, READ or WRITE
2221 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2223 extern void check_disk_size_change(struct gendisk
*disk
,
2224 struct block_device
*bdev
);
2225 extern int revalidate_disk(struct gendisk
*);
2226 extern int check_disk_change(struct block_device
*);
2227 extern int __invalidate_device(struct block_device
*, bool);
2228 extern int invalidate_partition(struct gendisk
*, int);
2230 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2231 pgoff_t start
, pgoff_t end
);
2233 static inline void invalidate_remote_inode(struct inode
*inode
)
2235 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2236 S_ISLNK(inode
->i_mode
))
2237 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2239 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2240 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2241 pgoff_t start
, pgoff_t end
);
2242 extern int write_inode_now(struct inode
*, int);
2243 extern int filemap_fdatawrite(struct address_space
*);
2244 extern int filemap_flush(struct address_space
*);
2245 extern int filemap_fdatawait(struct address_space
*);
2246 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2248 extern int filemap_write_and_wait(struct address_space
*mapping
);
2249 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2250 loff_t lstart
, loff_t lend
);
2251 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2252 loff_t start
, loff_t end
, int sync_mode
);
2253 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2254 loff_t start
, loff_t end
);
2256 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2258 extern int vfs_fsync(struct file
*file
, int datasync
);
2259 static inline int generic_write_sync(struct file
*file
, loff_t pos
, loff_t count
)
2261 if (!(file
->f_flags
& O_DSYNC
) && !IS_SYNC(file
->f_mapping
->host
))
2263 return vfs_fsync_range(file
, pos
, pos
+ count
- 1,
2264 (file
->f_flags
& __O_SYNC
) ? 0 : 1);
2266 extern void emergency_sync(void);
2267 extern void emergency_remount(void);
2269 extern sector_t
bmap(struct inode
*, sector_t
);
2271 extern int notify_change(struct dentry
*, struct iattr
*, struct inode
**);
2272 extern int inode_permission(struct inode
*, int);
2273 extern int generic_permission(struct inode
*, int);
2275 static inline bool execute_ok(struct inode
*inode
)
2277 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2280 static inline void file_start_write(struct file
*file
)
2282 if (!S_ISREG(file_inode(file
)->i_mode
))
2284 __sb_start_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
, true);
2287 static inline bool file_start_write_trylock(struct file
*file
)
2289 if (!S_ISREG(file_inode(file
)->i_mode
))
2291 return __sb_start_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
, false);
2294 static inline void file_end_write(struct file
*file
)
2296 if (!S_ISREG(file_inode(file
)->i_mode
))
2298 __sb_end_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
);
2302 * get_write_access() gets write permission for a file.
2303 * put_write_access() releases this write permission.
2304 * This is used for regular files.
2305 * We cannot support write (and maybe mmap read-write shared) accesses and
2306 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2307 * can have the following values:
2308 * 0: no writers, no VM_DENYWRITE mappings
2309 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2310 * > 0: (i_writecount) users are writing to the file.
2312 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2313 * except for the cases where we don't hold i_writecount yet. Then we need to
2314 * use {get,deny}_write_access() - these functions check the sign and refuse
2315 * to do the change if sign is wrong.
2317 static inline int get_write_access(struct inode
*inode
)
2319 return atomic_inc_unless_negative(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2321 static inline int deny_write_access(struct file
*file
)
2323 struct inode
*inode
= file_inode(file
);
2324 return atomic_dec_unless_positive(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2326 static inline void put_write_access(struct inode
* inode
)
2328 atomic_dec(&inode
->i_writecount
);
2330 static inline void allow_write_access(struct file
*file
)
2333 atomic_inc(&file_inode(file
)->i_writecount
);
2335 static inline bool inode_is_open_for_write(const struct inode
*inode
)
2337 return atomic_read(&inode
->i_writecount
) > 0;
2341 static inline void i_readcount_dec(struct inode
*inode
)
2343 BUG_ON(!atomic_read(&inode
->i_readcount
));
2344 atomic_dec(&inode
->i_readcount
);
2346 static inline void i_readcount_inc(struct inode
*inode
)
2348 atomic_inc(&inode
->i_readcount
);
2351 static inline void i_readcount_dec(struct inode
*inode
)
2355 static inline void i_readcount_inc(struct inode
*inode
)
2360 extern int do_pipe_flags(int *, int);
2362 extern int kernel_read(struct file
*, loff_t
, char *, unsigned long);
2363 extern ssize_t
kernel_write(struct file
*, const char *, size_t, loff_t
);
2364 extern ssize_t
__kernel_write(struct file
*, const char *, size_t, loff_t
*);
2365 extern struct file
* open_exec(const char *);
2367 /* fs/dcache.c -- generic fs support functions */
2368 extern int is_subdir(struct dentry
*, struct dentry
*);
2369 extern int path_is_under(struct path
*, struct path
*);
2371 #include <linux/err.h>
2373 /* needed for stackable file system support */
2374 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int whence
);
2376 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int whence
);
2378 extern int inode_init_always(struct super_block
*, struct inode
*);
2379 extern void inode_init_once(struct inode
*);
2380 extern void address_space_init_once(struct address_space
*mapping
);
2381 extern struct inode
* igrab(struct inode
*);
2382 extern ino_t
iunique(struct super_block
*, ino_t
);
2383 extern int inode_needs_sync(struct inode
*inode
);
2384 extern int generic_delete_inode(struct inode
*inode
);
2385 static inline int generic_drop_inode(struct inode
*inode
)
2387 return !inode
->i_nlink
|| inode_unhashed(inode
);
2390 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2391 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2393 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2394 int (*test
)(struct inode
*, void *), void *data
);
2395 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2397 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2398 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2399 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2400 extern int insert_inode_locked(struct inode
*);
2401 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2402 extern void lockdep_annotate_inode_mutex_key(struct inode
*inode
);
2404 static inline void lockdep_annotate_inode_mutex_key(struct inode
*inode
) { };
2406 extern void unlock_new_inode(struct inode
*);
2407 extern unsigned int get_next_ino(void);
2409 extern void __iget(struct inode
* inode
);
2410 extern void iget_failed(struct inode
*);
2411 extern void clear_inode(struct inode
*);
2412 extern void __destroy_inode(struct inode
*);
2413 extern struct inode
*new_inode_pseudo(struct super_block
*sb
);
2414 extern struct inode
*new_inode(struct super_block
*sb
);
2415 extern void free_inode_nonrcu(struct inode
*inode
);
2416 extern int should_remove_suid(struct dentry
*);
2417 extern int file_remove_suid(struct file
*);
2419 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2420 static inline void insert_inode_hash(struct inode
*inode
)
2422 __insert_inode_hash(inode
, inode
->i_ino
);
2425 extern void __remove_inode_hash(struct inode
*);
2426 static inline void remove_inode_hash(struct inode
*inode
)
2428 if (!inode_unhashed(inode
))
2429 __remove_inode_hash(inode
);
2432 extern void inode_sb_list_add(struct inode
*inode
);
2435 extern void submit_bio(int, struct bio
*);
2436 extern int bdev_read_only(struct block_device
*);
2438 extern int set_blocksize(struct block_device
*, int);
2439 extern int sb_set_blocksize(struct super_block
*, int);
2440 extern int sb_min_blocksize(struct super_block
*, int);
2442 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2443 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2444 extern int generic_file_remap_pages(struct vm_area_struct
*, unsigned long addr
,
2445 unsigned long size
, pgoff_t pgoff
);
2446 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
2447 extern ssize_t
generic_file_read_iter(struct kiocb
*, struct iov_iter
*);
2448 extern ssize_t
__generic_file_write_iter(struct kiocb
*, struct iov_iter
*);
2449 extern ssize_t
generic_file_write_iter(struct kiocb
*, struct iov_iter
*);
2450 extern ssize_t
generic_file_direct_write(struct kiocb
*, struct iov_iter
*, loff_t
);
2451 extern ssize_t
generic_perform_write(struct file
*, struct iov_iter
*, loff_t
);
2452 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2453 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2454 extern ssize_t
new_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2455 extern ssize_t
new_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2457 /* fs/block_dev.c */
2458 extern ssize_t
blkdev_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
);
2459 extern int blkdev_fsync(struct file
*filp
, loff_t start
, loff_t end
,
2461 extern void block_sync_page(struct page
*page
);
2464 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
2465 struct pipe_inode_info
*, size_t, unsigned int);
2466 extern ssize_t
default_file_splice_read(struct file
*, loff_t
*,
2467 struct pipe_inode_info
*, size_t, unsigned int);
2468 extern ssize_t
iter_file_splice_write(struct pipe_inode_info
*,
2469 struct file
*, loff_t
*, size_t, unsigned int);
2470 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
2471 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
2474 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
2475 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int whence
);
2476 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int whence
);
2477 extern loff_t
vfs_setpos(struct file
*file
, loff_t offset
, loff_t maxsize
);
2478 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int whence
);
2479 extern loff_t
generic_file_llseek_size(struct file
*file
, loff_t offset
,
2480 int whence
, loff_t maxsize
, loff_t eof
);
2481 extern loff_t
fixed_size_llseek(struct file
*file
, loff_t offset
,
2482 int whence
, loff_t size
);
2483 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
2484 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
2486 #ifdef CONFIG_FS_XIP
2487 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
2489 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
2490 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
2491 size_t len
, loff_t
*ppos
);
2492 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
2494 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
2501 typedef void (dio_submit_t
)(int rw
, struct bio
*bio
, struct inode
*inode
,
2502 loff_t file_offset
);
2505 /* need locking between buffered and direct access */
2508 /* filesystem does not support filling holes */
2509 DIO_SKIP_HOLES
= 0x02,
2511 /* filesystem can handle aio writes beyond i_size */
2512 DIO_ASYNC_EXTEND
= 0x04,
2515 void dio_end_io(struct bio
*bio
, int error
);
2517 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
2518 struct block_device
*bdev
, struct iov_iter
*iter
, loff_t offset
,
2519 get_block_t get_block
, dio_iodone_t end_io
,
2520 dio_submit_t submit_io
, int flags
);
2522 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2523 struct inode
*inode
, struct iov_iter
*iter
, loff_t offset
,
2524 get_block_t get_block
)
2526 return __blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iter
,
2527 offset
, get_block
, NULL
, NULL
,
2528 DIO_LOCKING
| DIO_SKIP_HOLES
);
2532 void inode_dio_wait(struct inode
*inode
);
2533 void inode_dio_done(struct inode
*inode
);
2535 extern void inode_set_flags(struct inode
*inode
, unsigned int flags
,
2538 extern const struct file_operations generic_ro_fops
;
2540 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2542 extern int readlink_copy(char __user
*, int, const char *);
2543 extern int page_readlink(struct dentry
*, char __user
*, int);
2544 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2545 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2546 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2548 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2549 extern const struct inode_operations page_symlink_inode_operations
;
2550 extern void kfree_put_link(struct dentry
*, struct nameidata
*, void *);
2551 extern int generic_readlink(struct dentry
*, char __user
*, int);
2552 extern void generic_fillattr(struct inode
*, struct kstat
*);
2553 int vfs_getattr_nosec(struct path
*path
, struct kstat
*stat
);
2554 extern int vfs_getattr(struct path
*, struct kstat
*);
2555 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2556 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2557 void __inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2558 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2559 loff_t
inode_get_bytes(struct inode
*inode
);
2560 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2562 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2563 extern int iterate_dir(struct file
*, struct dir_context
*);
2565 extern int vfs_stat(const char __user
*, struct kstat
*);
2566 extern int vfs_lstat(const char __user
*, struct kstat
*);
2567 extern int vfs_fstat(unsigned int, struct kstat
*);
2568 extern int vfs_fstatat(int , const char __user
*, struct kstat
*, int);
2570 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2572 extern int __generic_block_fiemap(struct inode
*inode
,
2573 struct fiemap_extent_info
*fieinfo
,
2574 loff_t start
, loff_t len
,
2575 get_block_t
*get_block
);
2576 extern int generic_block_fiemap(struct inode
*inode
,
2577 struct fiemap_extent_info
*fieinfo
, u64 start
,
2578 u64 len
, get_block_t
*get_block
);
2580 extern void get_filesystem(struct file_system_type
*fs
);
2581 extern void put_filesystem(struct file_system_type
*fs
);
2582 extern struct file_system_type
*get_fs_type(const char *name
);
2583 extern struct super_block
*get_super(struct block_device
*);
2584 extern struct super_block
*get_super_thawed(struct block_device
*);
2585 extern struct super_block
*get_active_super(struct block_device
*bdev
);
2586 extern void drop_super(struct super_block
*sb
);
2587 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
2588 extern void iterate_supers_type(struct file_system_type
*,
2589 void (*)(struct super_block
*, void *), void *);
2591 extern int dcache_dir_open(struct inode
*, struct file
*);
2592 extern int dcache_dir_close(struct inode
*, struct file
*);
2593 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2594 extern int dcache_readdir(struct file
*, struct dir_context
*);
2595 extern int simple_setattr(struct dentry
*, struct iattr
*);
2596 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2597 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2598 extern int simple_open(struct inode
*inode
, struct file
*file
);
2599 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2600 extern int simple_unlink(struct inode
*, struct dentry
*);
2601 extern int simple_rmdir(struct inode
*, struct dentry
*);
2602 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2603 extern int noop_fsync(struct file
*, loff_t
, loff_t
, int);
2604 extern int simple_empty(struct dentry
*);
2605 extern int simple_readpage(struct file
*file
, struct page
*page
);
2606 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2607 loff_t pos
, unsigned len
, unsigned flags
,
2608 struct page
**pagep
, void **fsdata
);
2609 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2610 loff_t pos
, unsigned len
, unsigned copied
,
2611 struct page
*page
, void *fsdata
);
2612 extern int always_delete_dentry(const struct dentry
*);
2613 extern struct inode
*alloc_anon_inode(struct super_block
*);
2614 extern const struct dentry_operations simple_dentry_operations
;
2616 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, unsigned int flags
);
2617 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2618 extern const struct file_operations simple_dir_operations
;
2619 extern const struct inode_operations simple_dir_inode_operations
;
2620 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2621 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2622 extern int simple_fill_super(struct super_block
*, unsigned long, struct tree_descr
*);
2623 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2624 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2626 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2627 loff_t
*ppos
, const void *from
, size_t available
);
2628 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
2629 const void __user
*from
, size_t count
);
2631 extern int __generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2632 extern int generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2634 extern int generic_check_addressable(unsigned, u64
);
2636 #ifdef CONFIG_MIGRATION
2637 extern int buffer_migrate_page(struct address_space
*,
2638 struct page
*, struct page
*,
2641 #define buffer_migrate_page NULL
2644 extern int inode_change_ok(const struct inode
*, struct iattr
*);
2645 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
2646 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
2648 extern int file_update_time(struct file
*file
);
2650 extern int generic_show_options(struct seq_file
*m
, struct dentry
*root
);
2651 extern void save_mount_options(struct super_block
*sb
, char *options
);
2652 extern void replace_mount_options(struct super_block
*sb
, char *options
);
2654 static inline ino_t
parent_ino(struct dentry
*dentry
)
2659 * Don't strictly need d_lock here? If the parent ino could change
2660 * then surely we'd have a deeper race in the caller?
2662 spin_lock(&dentry
->d_lock
);
2663 res
= dentry
->d_parent
->d_inode
->i_ino
;
2664 spin_unlock(&dentry
->d_lock
);
2668 /* Transaction based IO helpers */
2671 * An argresp is stored in an allocated page and holds the
2672 * size of the argument or response, along with its content
2674 struct simple_transaction_argresp
{
2679 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2681 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2683 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2684 size_t size
, loff_t
*pos
);
2685 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2687 void simple_transaction_set(struct file
*file
, size_t n
);
2690 * simple attribute files
2692 * These attributes behave similar to those in sysfs:
2694 * Writing to an attribute immediately sets a value, an open file can be
2695 * written to multiple times.
2697 * Reading from an attribute creates a buffer from the value that might get
2698 * read with multiple read calls. When the attribute has been read
2699 * completely, no further read calls are possible until the file is opened
2702 * All attributes contain a text representation of a numeric value
2703 * that are accessed with the get() and set() functions.
2705 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2706 static int __fops ## _open(struct inode *inode, struct file *file) \
2708 __simple_attr_check_format(__fmt, 0ull); \
2709 return simple_attr_open(inode, file, __get, __set, __fmt); \
2711 static const struct file_operations __fops = { \
2712 .owner = THIS_MODULE, \
2713 .open = __fops ## _open, \
2714 .release = simple_attr_release, \
2715 .read = simple_attr_read, \
2716 .write = simple_attr_write, \
2717 .llseek = generic_file_llseek, \
2720 static inline __printf(1, 2)
2721 void __simple_attr_check_format(const char *fmt
, ...)
2723 /* don't do anything, just let the compiler check the arguments; */
2726 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2727 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2729 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2730 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2731 size_t len
, loff_t
*ppos
);
2732 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2733 size_t len
, loff_t
*ppos
);
2736 int proc_nr_files(struct ctl_table
*table
, int write
,
2737 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2738 int proc_nr_dentry(struct ctl_table
*table
, int write
,
2739 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2740 int proc_nr_inodes(struct ctl_table
*table
, int write
,
2741 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2742 int __init
get_filesystem_list(char *buf
);
2744 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2745 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2747 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2748 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2749 (flag & __FMODE_NONOTIFY)))
2751 static inline int is_sxid(umode_t mode
)
2753 return (mode
& S_ISUID
) || ((mode
& S_ISGID
) && (mode
& S_IXGRP
));
2756 static inline void inode_has_no_xattr(struct inode
*inode
)
2758 if (!is_sxid(inode
->i_mode
) && (inode
->i_sb
->s_flags
& MS_NOSEC
))
2759 inode
->i_flags
|= S_NOSEC
;
2762 static inline bool dir_emit(struct dir_context
*ctx
,
2763 const char *name
, int namelen
,
2764 u64 ino
, unsigned type
)
2766 return ctx
->actor(ctx
, name
, namelen
, ctx
->pos
, ino
, type
) == 0;
2768 static inline bool dir_emit_dot(struct file
*file
, struct dir_context
*ctx
)
2770 return ctx
->actor(ctx
, ".", 1, ctx
->pos
,
2771 file
->f_path
.dentry
->d_inode
->i_ino
, DT_DIR
) == 0;
2773 static inline bool dir_emit_dotdot(struct file
*file
, struct dir_context
*ctx
)
2775 return ctx
->actor(ctx
, "..", 2, ctx
->pos
,
2776 parent_ino(file
->f_path
.dentry
), DT_DIR
) == 0;
2778 static inline bool dir_emit_dots(struct file
*file
, struct dir_context
*ctx
)
2780 if (ctx
->pos
== 0) {
2781 if (!dir_emit_dot(file
, ctx
))
2785 if (ctx
->pos
== 1) {
2786 if (!dir_emit_dotdot(file
, ctx
))
2792 static inline bool dir_relax(struct inode
*inode
)
2794 mutex_unlock(&inode
->i_mutex
);
2795 mutex_lock(&inode
->i_mutex
);
2796 return !IS_DEADDIR(inode
);
2799 #endif /* _LINUX_FS_H */