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/rwsem.h>
22 #include <linux/capability.h>
23 #include <linux/semaphore.h>
24 #include <linux/fiemap.h>
25 #include <linux/rculist_bl.h>
26 #include <linux/atomic.h>
27 #include <linux/shrinker.h>
28 #include <linux/migrate_mode.h>
29 #include <linux/uidgid.h>
30 #include <linux/lockdep.h>
31 #include <linux/percpu-rwsem.h>
32 #include <linux/blk_types.h>
34 #include <asm/byteorder.h>
35 #include <uapi/linux/fs.h>
37 struct export_operations
;
43 struct pipe_inode_info
;
44 struct poll_table_struct
;
46 struct vm_area_struct
;
49 struct swap_info_struct
;
51 struct workqueue_struct
;
54 extern void __init
inode_init(void);
55 extern void __init
inode_init_early(void);
56 extern void __init
files_init(unsigned long);
58 extern struct files_stat_struct files_stat
;
59 extern unsigned long get_max_files(void);
60 extern int sysctl_nr_open
;
61 extern struct inodes_stat_t inodes_stat
;
62 extern int leases_enable
, lease_break_time
;
63 extern int sysctl_protected_symlinks
;
64 extern int sysctl_protected_hardlinks
;
67 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
68 struct buffer_head
*bh_result
, int create
);
69 typedef void (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
70 ssize_t bytes
, void *private);
72 #define MAY_EXEC 0x00000001
73 #define MAY_WRITE 0x00000002
74 #define MAY_READ 0x00000004
75 #define MAY_APPEND 0x00000008
76 #define MAY_ACCESS 0x00000010
77 #define MAY_OPEN 0x00000020
78 #define MAY_CHDIR 0x00000040
79 /* called from RCU mode, don't block */
80 #define MAY_NOT_BLOCK 0x00000080
83 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
84 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
87 /* file is open for reading */
88 #define FMODE_READ ((__force fmode_t)0x1)
89 /* file is open for writing */
90 #define FMODE_WRITE ((__force fmode_t)0x2)
91 /* file is seekable */
92 #define FMODE_LSEEK ((__force fmode_t)0x4)
93 /* file can be accessed using pread */
94 #define FMODE_PREAD ((__force fmode_t)0x8)
95 /* file can be accessed using pwrite */
96 #define FMODE_PWRITE ((__force fmode_t)0x10)
97 /* File is opened for execution with sys_execve / sys_uselib */
98 #define FMODE_EXEC ((__force fmode_t)0x20)
99 /* File is opened with O_NDELAY (only set for block devices) */
100 #define FMODE_NDELAY ((__force fmode_t)0x40)
101 /* File is opened with O_EXCL (only set for block devices) */
102 #define FMODE_EXCL ((__force fmode_t)0x80)
103 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
104 (specialy hack for floppy.c) */
105 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
106 /* 32bit hashes as llseek() offset (for directories) */
107 #define FMODE_32BITHASH ((__force fmode_t)0x200)
108 /* 64bit hashes as llseek() offset (for directories) */
109 #define FMODE_64BITHASH ((__force fmode_t)0x400)
112 * Don't update ctime and mtime.
114 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
115 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
117 #define FMODE_NOCMTIME ((__force fmode_t)0x800)
119 /* Expect random access pattern */
120 #define FMODE_RANDOM ((__force fmode_t)0x1000)
122 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
123 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
125 /* File is opened with O_PATH; almost nothing can be done with it */
126 #define FMODE_PATH ((__force fmode_t)0x4000)
128 /* File needs atomic accesses to f_pos */
129 #define FMODE_ATOMIC_POS ((__force fmode_t)0x8000)
130 /* Write access to underlying fs */
131 #define FMODE_WRITER ((__force fmode_t)0x10000)
132 /* Has read method(s) */
133 #define FMODE_CAN_READ ((__force fmode_t)0x20000)
134 /* Has write method(s) */
135 #define FMODE_CAN_WRITE ((__force fmode_t)0x40000)
137 /* File was opened by fanotify and shouldn't generate fanotify events */
138 #define FMODE_NONOTIFY ((__force fmode_t)0x4000000)
141 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
142 * that indicates that they should check the contents of the iovec are
143 * valid, but not check the memory that the iovec elements
146 #define CHECK_IOVEC_ONLY -1
149 * The below are the various read and write types that we support. Some of
150 * them include behavioral modifiers that send information down to the
151 * block layer and IO scheduler. Terminology:
153 * The block layer uses device plugging to defer IO a little bit, in
154 * the hope that we will see more IO very shortly. This increases
155 * coalescing of adjacent IO and thus reduces the number of IOs we
156 * have to send to the device. It also allows for better queuing,
157 * if the IO isn't mergeable. If the caller is going to be waiting
158 * for the IO, then he must ensure that the device is unplugged so
159 * that the IO is dispatched to the driver.
161 * All IO is handled async in Linux. This is fine for background
162 * writes, but for reads or writes that someone waits for completion
163 * on, we want to notify the block layer and IO scheduler so that they
164 * know about it. That allows them to make better scheduling
165 * decisions. So when the below references 'sync' and 'async', it
166 * is referencing this priority hint.
168 * With that in mind, the available types are:
170 * READ A normal read operation. Device will be plugged.
171 * READ_SYNC A synchronous read. Device is not plugged, caller can
172 * immediately wait on this read without caring about
174 * READA Used for read-ahead operations. Lower priority, and the
175 * block layer could (in theory) choose to ignore this
176 * request if it runs into resource problems.
177 * WRITE A normal async write. Device will be plugged.
178 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down
179 * the hint that someone will be waiting on this IO
180 * shortly. The write equivalent of READ_SYNC.
181 * WRITE_ODIRECT Special case write for O_DIRECT only.
182 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
183 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
184 * non-volatile media on completion.
185 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
186 * by a cache flush and data is guaranteed to be on
187 * non-volatile media on completion.
190 #define RW_MASK REQ_WRITE
191 #define RWA_MASK REQ_RAHEAD
194 #define WRITE RW_MASK
195 #define READA RWA_MASK
197 #define READ_SYNC (READ | REQ_SYNC)
198 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
199 #define WRITE_ODIRECT (WRITE | REQ_SYNC)
200 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
201 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
202 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
205 * Attribute flags. These should be or-ed together to figure out what
208 #define ATTR_MODE (1 << 0)
209 #define ATTR_UID (1 << 1)
210 #define ATTR_GID (1 << 2)
211 #define ATTR_SIZE (1 << 3)
212 #define ATTR_ATIME (1 << 4)
213 #define ATTR_MTIME (1 << 5)
214 #define ATTR_CTIME (1 << 6)
215 #define ATTR_ATIME_SET (1 << 7)
216 #define ATTR_MTIME_SET (1 << 8)
217 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
218 #define ATTR_ATTR_FLAG (1 << 10)
219 #define ATTR_KILL_SUID (1 << 11)
220 #define ATTR_KILL_SGID (1 << 12)
221 #define ATTR_FILE (1 << 13)
222 #define ATTR_KILL_PRIV (1 << 14)
223 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
224 #define ATTR_TIMES_SET (1 << 16)
227 * Whiteout is represented by a char device. The following constants define the
228 * mode and device number to use.
230 #define WHITEOUT_MODE 0
231 #define WHITEOUT_DEV 0
234 * This is the Inode Attributes structure, used for notify_change(). It
235 * uses the above definitions as flags, to know which values have changed.
236 * Also, in this manner, a Filesystem can look at only the values it cares
237 * about. Basically, these are the attributes that the VFS layer can
238 * request to change from the FS layer.
240 * Derek Atkins <warlord@MIT.EDU> 94-10-20
243 unsigned int ia_valid
;
248 struct timespec ia_atime
;
249 struct timespec ia_mtime
;
250 struct timespec ia_ctime
;
253 * Not an attribute, but an auxiliary info for filesystems wanting to
254 * implement an ftruncate() like method. NOTE: filesystem should
255 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
257 struct file
*ia_file
;
261 * Includes for diskquotas.
263 #include <linux/quota.h>
266 * Maximum number of layers of fs stack. Needs to be limited to
267 * prevent kernel stack overflow
269 #define FILESYSTEM_MAX_STACK_DEPTH 2
272 * enum positive_aop_returns - aop return codes with specific semantics
274 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
275 * completed, that the page is still locked, and
276 * should be considered active. The VM uses this hint
277 * to return the page to the active list -- it won't
278 * be a candidate for writeback again in the near
279 * future. Other callers must be careful to unlock
280 * the page if they get this return. Returned by
283 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
284 * unlocked it and the page might have been truncated.
285 * The caller should back up to acquiring a new page and
286 * trying again. The aop will be taking reasonable
287 * precautions not to livelock. If the caller held a page
288 * reference, it should drop it before retrying. Returned
291 * address_space_operation functions return these large constants to indicate
292 * special semantics to the caller. These are much larger than the bytes in a
293 * page to allow for functions that return the number of bytes operated on in a
297 enum positive_aop_returns
{
298 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
299 AOP_TRUNCATED_PAGE
= 0x80001,
302 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
303 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
304 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
305 * helper code (eg buffer layer)
306 * to clear GFP_FS from alloc */
309 * oh the beauties of C type declarations.
312 struct address_space
;
313 struct writeback_control
;
316 * "descriptor" for what we're up to with a read.
317 * This allows us to use the same read code yet
318 * have multiple different users of the data that
319 * we read from a file.
321 * The simplest case just copies the data to user
334 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
335 unsigned long, unsigned long);
337 struct address_space_operations
{
338 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
339 int (*readpage
)(struct file
*, struct page
*);
341 /* Write back some dirty pages from this mapping. */
342 int (*writepages
)(struct address_space
*, struct writeback_control
*);
344 /* Set a page dirty. Return true if this dirtied it */
345 int (*set_page_dirty
)(struct page
*page
);
347 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
348 struct list_head
*pages
, unsigned nr_pages
);
350 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
351 loff_t pos
, unsigned len
, unsigned flags
,
352 struct page
**pagep
, void **fsdata
);
353 int (*write_end
)(struct file
*, struct address_space
*mapping
,
354 loff_t pos
, unsigned len
, unsigned copied
,
355 struct page
*page
, void *fsdata
);
357 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
358 sector_t (*bmap
)(struct address_space
*, sector_t
);
359 void (*invalidatepage
) (struct page
*, unsigned int, unsigned int);
360 int (*releasepage
) (struct page
*, gfp_t
);
361 void (*freepage
)(struct page
*);
362 ssize_t (*direct_IO
)(int, struct kiocb
*, struct iov_iter
*iter
, loff_t offset
);
363 int (*get_xip_mem
)(struct address_space
*, pgoff_t
, int,
364 void **, unsigned long *);
366 * migrate the contents of a page to the specified target. If
367 * migrate_mode is MIGRATE_ASYNC, it must not block.
369 int (*migratepage
) (struct address_space
*,
370 struct page
*, struct page
*, enum migrate_mode
);
371 int (*launder_page
) (struct page
*);
372 int (*is_partially_uptodate
) (struct page
*, unsigned long,
374 void (*is_dirty_writeback
) (struct page
*, bool *, bool *);
375 int (*error_remove_page
)(struct address_space
*, struct page
*);
377 /* swapfile support */
378 int (*swap_activate
)(struct swap_info_struct
*sis
, struct file
*file
,
380 void (*swap_deactivate
)(struct file
*file
);
383 extern const struct address_space_operations empty_aops
;
386 * pagecache_write_begin/pagecache_write_end must be used by general code
387 * to write into the pagecache.
389 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
390 loff_t pos
, unsigned len
, unsigned flags
,
391 struct page
**pagep
, void **fsdata
);
393 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
394 loff_t pos
, unsigned len
, unsigned copied
,
395 struct page
*page
, void *fsdata
);
397 struct backing_dev_info
;
398 struct address_space
{
399 struct inode
*host
; /* owner: inode, block_device */
400 struct radix_tree_root page_tree
; /* radix tree of all pages */
401 spinlock_t tree_lock
; /* and lock protecting it */
402 atomic_t i_mmap_writable
;/* count VM_SHARED mappings */
403 struct rb_root i_mmap
; /* tree of private and shared mappings */
404 struct list_head i_mmap_nonlinear
;/*list VM_NONLINEAR mappings */
405 struct rw_semaphore i_mmap_rwsem
; /* protect tree, count, list */
406 /* Protected by tree_lock together with the radix tree */
407 unsigned long nrpages
; /* number of total pages */
408 unsigned long nrshadows
; /* number of shadow entries */
409 pgoff_t writeback_index
;/* writeback starts here */
410 const struct address_space_operations
*a_ops
; /* methods */
411 unsigned long flags
; /* error bits/gfp mask */
412 struct backing_dev_info
*backing_dev_info
; /* device readahead, etc */
413 spinlock_t private_lock
; /* for use by the address_space */
414 struct list_head private_list
; /* ditto */
415 void *private_data
; /* ditto */
416 } __attribute__((aligned(sizeof(long))));
418 * On most architectures that alignment is already the case; but
419 * must be enforced here for CRIS, to let the least significant bit
420 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
422 struct request_queue
;
424 struct block_device
{
425 dev_t bd_dev
; /* not a kdev_t - it's a search key */
427 struct inode
* bd_inode
; /* will die */
428 struct super_block
* bd_super
;
429 struct mutex bd_mutex
; /* open/close mutex */
430 struct list_head bd_inodes
;
434 bool bd_write_holder
;
436 struct list_head bd_holder_disks
;
438 struct block_device
* bd_contains
;
439 unsigned bd_block_size
;
440 struct hd_struct
* bd_part
;
441 /* number of times partitions within this device have been opened. */
442 unsigned bd_part_count
;
444 struct gendisk
* bd_disk
;
445 struct request_queue
* bd_queue
;
446 struct list_head bd_list
;
448 * Private data. You must have bd_claim'ed the block_device
449 * to use this. NOTE: bd_claim allows an owner to claim
450 * the same device multiple times, the owner must take special
451 * care to not mess up bd_private for that case.
453 unsigned long bd_private
;
455 /* The counter of freeze processes */
456 int bd_fsfreeze_count
;
457 /* Mutex for freeze */
458 struct mutex bd_fsfreeze_mutex
;
462 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
465 #define PAGECACHE_TAG_DIRTY 0
466 #define PAGECACHE_TAG_WRITEBACK 1
467 #define PAGECACHE_TAG_TOWRITE 2
469 int mapping_tagged(struct address_space
*mapping
, int tag
);
471 static inline void i_mmap_lock_write(struct address_space
*mapping
)
473 down_write(&mapping
->i_mmap_rwsem
);
476 static inline void i_mmap_unlock_write(struct address_space
*mapping
)
478 up_write(&mapping
->i_mmap_rwsem
);
481 static inline void i_mmap_lock_read(struct address_space
*mapping
)
483 down_read(&mapping
->i_mmap_rwsem
);
486 static inline void i_mmap_unlock_read(struct address_space
*mapping
)
488 up_read(&mapping
->i_mmap_rwsem
);
492 * Might pages of this file be mapped into userspace?
494 static inline int mapping_mapped(struct address_space
*mapping
)
496 return !RB_EMPTY_ROOT(&mapping
->i_mmap
) ||
497 !list_empty(&mapping
->i_mmap_nonlinear
);
501 * Might pages of this file have been modified in userspace?
502 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
503 * marks vma as VM_SHARED if it is shared, and the file was opened for
504 * writing i.e. vma may be mprotected writable even if now readonly.
506 * If i_mmap_writable is negative, no new writable mappings are allowed. You
507 * can only deny writable mappings, if none exists right now.
509 static inline int mapping_writably_mapped(struct address_space
*mapping
)
511 return atomic_read(&mapping
->i_mmap_writable
) > 0;
514 static inline int mapping_map_writable(struct address_space
*mapping
)
516 return atomic_inc_unless_negative(&mapping
->i_mmap_writable
) ?
520 static inline void mapping_unmap_writable(struct address_space
*mapping
)
522 atomic_dec(&mapping
->i_mmap_writable
);
525 static inline int mapping_deny_writable(struct address_space
*mapping
)
527 return atomic_dec_unless_positive(&mapping
->i_mmap_writable
) ?
531 static inline void mapping_allow_writable(struct address_space
*mapping
)
533 atomic_inc(&mapping
->i_mmap_writable
);
537 * Use sequence counter to get consistent i_size on 32-bit processors.
539 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
540 #include <linux/seqlock.h>
541 #define __NEED_I_SIZE_ORDERED
542 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
544 #define i_size_ordered_init(inode) do { } while (0)
548 #define ACL_NOT_CACHED ((void *)(-1))
550 #define IOP_FASTPERM 0x0001
551 #define IOP_LOOKUP 0x0002
552 #define IOP_NOFOLLOW 0x0004
555 * Keep mostly read-only and often accessed (especially for
556 * the RCU path lookup and 'stat' data) fields at the beginning
557 * of the 'struct inode'
561 unsigned short i_opflags
;
564 unsigned int i_flags
;
566 #ifdef CONFIG_FS_POSIX_ACL
567 struct posix_acl
*i_acl
;
568 struct posix_acl
*i_default_acl
;
571 const struct inode_operations
*i_op
;
572 struct super_block
*i_sb
;
573 struct address_space
*i_mapping
;
575 #ifdef CONFIG_SECURITY
579 /* Stat data, not accessed from path walking */
582 * Filesystems may only read i_nlink directly. They shall use the
583 * following functions for modification:
585 * (set|clear|inc|drop)_nlink
586 * inode_(inc|dec)_link_count
589 const unsigned int i_nlink
;
590 unsigned int __i_nlink
;
594 struct timespec i_atime
;
595 struct timespec i_mtime
;
596 struct timespec i_ctime
;
597 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
598 unsigned short i_bytes
;
599 unsigned int i_blkbits
;
602 #ifdef __NEED_I_SIZE_ORDERED
603 seqcount_t i_size_seqcount
;
607 unsigned long i_state
;
608 struct mutex i_mutex
;
610 unsigned long dirtied_when
; /* jiffies of first dirtying */
612 struct hlist_node i_hash
;
613 struct list_head i_wb_list
; /* backing dev IO list */
614 struct list_head i_lru
; /* inode LRU list */
615 struct list_head i_sb_list
;
617 struct hlist_head i_dentry
;
618 struct rcu_head i_rcu
;
622 atomic_t i_dio_count
;
623 atomic_t i_writecount
;
625 atomic_t i_readcount
; /* struct files open RO */
627 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
628 struct file_lock_context
*i_flctx
;
629 struct address_space i_data
;
630 struct list_head i_devices
;
632 struct pipe_inode_info
*i_pipe
;
633 struct block_device
*i_bdev
;
639 #ifdef CONFIG_FSNOTIFY
640 __u32 i_fsnotify_mask
; /* all events this inode cares about */
641 struct hlist_head i_fsnotify_marks
;
644 void *i_private
; /* fs or device private pointer */
647 static inline int inode_unhashed(struct inode
*inode
)
649 return hlist_unhashed(&inode
->i_hash
);
653 * inode->i_mutex nesting subclasses for the lock validator:
655 * 0: the object of the current VFS operation
659 * 4: second non-directory
660 * 5: second parent (when locking independent directories in rename)
662 * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two
663 * non-directories at once.
665 * The locking order between these classes is
666 * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory
668 enum inode_i_mutex_lock_class
678 void lock_two_nondirectories(struct inode
*, struct inode
*);
679 void unlock_two_nondirectories(struct inode
*, struct inode
*);
682 * NOTE: in a 32bit arch with a preemptable kernel and
683 * an UP compile the i_size_read/write must be atomic
684 * with respect to the local cpu (unlike with preempt disabled),
685 * but they don't need to be atomic with respect to other cpus like in
686 * true SMP (so they need either to either locally disable irq around
687 * the read or for example on x86 they can be still implemented as a
688 * cmpxchg8b without the need of the lock prefix). For SMP compiles
689 * and 64bit archs it makes no difference if preempt is enabled or not.
691 static inline loff_t
i_size_read(const struct inode
*inode
)
693 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
698 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
699 i_size
= inode
->i_size
;
700 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
702 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
706 i_size
= inode
->i_size
;
710 return inode
->i_size
;
715 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
716 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
717 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
719 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
721 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
723 write_seqcount_begin(&inode
->i_size_seqcount
);
724 inode
->i_size
= i_size
;
725 write_seqcount_end(&inode
->i_size_seqcount
);
727 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
729 inode
->i_size
= i_size
;
732 inode
->i_size
= i_size
;
736 /* Helper functions so that in most cases filesystems will
737 * not need to deal directly with kuid_t and kgid_t and can
738 * instead deal with the raw numeric values that are stored
741 static inline uid_t
i_uid_read(const struct inode
*inode
)
743 return from_kuid(&init_user_ns
, inode
->i_uid
);
746 static inline gid_t
i_gid_read(const struct inode
*inode
)
748 return from_kgid(&init_user_ns
, inode
->i_gid
);
751 static inline void i_uid_write(struct inode
*inode
, uid_t uid
)
753 inode
->i_uid
= make_kuid(&init_user_ns
, uid
);
756 static inline void i_gid_write(struct inode
*inode
, gid_t gid
)
758 inode
->i_gid
= make_kgid(&init_user_ns
, gid
);
761 static inline unsigned iminor(const struct inode
*inode
)
763 return MINOR(inode
->i_rdev
);
766 static inline unsigned imajor(const struct inode
*inode
)
768 return MAJOR(inode
->i_rdev
);
771 extern struct block_device
*I_BDEV(struct inode
*inode
);
774 rwlock_t lock
; /* protects pid, uid, euid fields */
775 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
776 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
777 kuid_t uid
, euid
; /* uid/euid of process setting the owner */
778 int signum
; /* posix.1b rt signal to be delivered on IO */
782 * Track a single file's readahead state
784 struct file_ra_state
{
785 pgoff_t start
; /* where readahead started */
786 unsigned int size
; /* # of readahead pages */
787 unsigned int async_size
; /* do asynchronous readahead when
788 there are only # of pages ahead */
790 unsigned int ra_pages
; /* Maximum readahead window */
791 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
792 loff_t prev_pos
; /* Cache last read() position */
796 * Check if @index falls in the readahead windows.
798 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
800 return (index
>= ra
->start
&&
801 index
< ra
->start
+ ra
->size
);
806 struct llist_node fu_llist
;
807 struct rcu_head fu_rcuhead
;
810 struct inode
*f_inode
; /* cached value */
811 const struct file_operations
*f_op
;
814 * Protects f_ep_links, f_flags.
815 * Must not be taken from IRQ context.
818 atomic_long_t f_count
;
819 unsigned int f_flags
;
821 struct mutex f_pos_lock
;
823 struct fown_struct f_owner
;
824 const struct cred
*f_cred
;
825 struct file_ra_state f_ra
;
828 #ifdef CONFIG_SECURITY
831 /* needed for tty driver, and maybe others */
835 /* Used by fs/eventpoll.c to link all the hooks to this file */
836 struct list_head f_ep_links
;
837 struct list_head f_tfile_llink
;
838 #endif /* #ifdef CONFIG_EPOLL */
839 struct address_space
*f_mapping
;
840 } __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */
845 /* file identifier */
846 unsigned char f_handle
[0];
849 static inline struct file
*get_file(struct file
*f
)
851 atomic_long_inc(&f
->f_count
);
854 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
855 #define file_count(x) atomic_long_read(&(x)->f_count)
857 #define MAX_NON_LFS ((1UL<<31) - 1)
859 /* Page cache limit. The filesystems should put that into their s_maxbytes
860 limits, otherwise bad things can happen in VM. */
861 #if BITS_PER_LONG==32
862 #define MAX_LFS_FILESIZE (((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
863 #elif BITS_PER_LONG==64
864 #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL)
869 #define FL_DELEG 4 /* NFSv4 delegation */
870 #define FL_ACCESS 8 /* not trying to lock, just looking */
871 #define FL_EXISTS 16 /* when unlocking, test for existence */
872 #define FL_LEASE 32 /* lease held on this file */
873 #define FL_CLOSE 64 /* unlock on close */
874 #define FL_SLEEP 128 /* A blocking lock */
875 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
876 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
877 #define FL_OFDLCK 1024 /* lock is "owned" by struct file */
880 * Special return value from posix_lock_file() and vfs_lock_file() for
881 * asynchronous locking.
883 #define FILE_LOCK_DEFERRED 1
885 /* legacy typedef, should eventually be removed */
886 typedef void *fl_owner_t
;
890 struct file_lock_operations
{
891 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
892 void (*fl_release_private
)(struct file_lock
*);
895 struct lock_manager_operations
{
896 int (*lm_compare_owner
)(struct file_lock
*, struct file_lock
*);
897 unsigned long (*lm_owner_key
)(struct file_lock
*);
898 void (*lm_get_owner
)(struct file_lock
*, struct file_lock
*);
899 void (*lm_put_owner
)(struct file_lock
*);
900 void (*lm_notify
)(struct file_lock
*); /* unblock callback */
901 int (*lm_grant
)(struct file_lock
*, int);
902 bool (*lm_break
)(struct file_lock
*);
903 int (*lm_change
)(struct file_lock
**, int, struct list_head
*);
904 void (*lm_setup
)(struct file_lock
*, void **);
907 struct lock_manager
{
908 struct list_head list
;
912 void locks_start_grace(struct net
*, struct lock_manager
*);
913 void locks_end_grace(struct lock_manager
*);
914 int locks_in_grace(struct net
*);
916 /* that will die - we need it for nfs_lock_info */
917 #include <linux/nfs_fs_i.h>
920 * struct file_lock represents a generic "file lock". It's used to represent
921 * POSIX byte range locks, BSD (flock) locks, and leases. It's important to
922 * note that the same struct is used to represent both a request for a lock and
923 * the lock itself, but the same object is never used for both.
925 * FIXME: should we create a separate "struct lock_request" to help distinguish
928 * The i_flock list is ordered by:
930 * 1) lock type -- FL_LEASEs first, then FL_FLOCK, and finally FL_POSIX
932 * 3) lock range start
935 * Obviously, the last two criteria only matter for POSIX locks.
938 struct file_lock
*fl_next
; /* singly linked list for this inode */
939 struct list_head fl_list
; /* link into file_lock_context */
940 struct hlist_node fl_link
; /* node in global lists */
941 struct list_head fl_block
; /* circular list of blocked processes */
943 unsigned int fl_flags
;
944 unsigned char fl_type
;
946 int fl_link_cpu
; /* what cpu's list is this on? */
947 struct pid
*fl_nspid
;
948 wait_queue_head_t fl_wait
;
949 struct file
*fl_file
;
953 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
954 /* for lease breaks: */
955 unsigned long fl_break_time
;
956 unsigned long fl_downgrade_time
;
958 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
959 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
961 struct nfs_lock_info nfs_fl
;
962 struct nfs4_lock_info nfs4_fl
;
964 struct list_head link
; /* link in AFS vnode's pending_locks list */
965 int state
; /* state of grant or error if -ve */
970 struct file_lock_context
{
971 struct list_head flc_flock
;
972 struct list_head flc_posix
;
973 struct list_head flc_lease
;
976 /* The following constant reflects the upper bound of the file/locking space */
978 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
979 #define OFFSET_MAX INT_LIMIT(loff_t)
980 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
983 #include <linux/fcntl.h>
985 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
987 #ifdef CONFIG_FILE_LOCKING
988 extern int fcntl_getlk(struct file
*, unsigned int, struct flock __user
*);
989 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
990 struct flock __user
*);
992 #if BITS_PER_LONG == 32
993 extern int fcntl_getlk64(struct file
*, unsigned int, struct flock64 __user
*);
994 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
995 struct flock64 __user
*);
998 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
999 extern int fcntl_getlease(struct file
*filp
);
1002 void locks_free_lock_context(struct file_lock_context
*ctx
);
1003 void locks_free_lock(struct file_lock
*fl
);
1004 extern void locks_init_lock(struct file_lock
*);
1005 extern struct file_lock
* locks_alloc_lock(void);
1006 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
1007 extern void locks_copy_conflock(struct file_lock
*, struct file_lock
*);
1008 extern void locks_remove_posix(struct file
*, fl_owner_t
);
1009 extern void locks_remove_file(struct file
*);
1010 extern void locks_release_private(struct file_lock
*);
1011 extern void posix_test_lock(struct file
*, struct file_lock
*);
1012 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
1013 extern int posix_lock_file_wait(struct file
*, struct file_lock
*);
1014 extern int posix_unblock_lock(struct file_lock
*);
1015 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1016 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1017 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1018 extern int flock_lock_file_wait(struct file
*filp
, struct file_lock
*fl
);
1019 extern int __break_lease(struct inode
*inode
, unsigned int flags
, unsigned int type
);
1020 extern void lease_get_mtime(struct inode
*, struct timespec
*time
);
1021 extern int generic_setlease(struct file
*, long, struct file_lock
**, void **priv
);
1022 extern int vfs_setlease(struct file
*, long, struct file_lock
**, void **);
1023 extern int lease_modify(struct file_lock
**, int, struct list_head
*);
1024 #else /* !CONFIG_FILE_LOCKING */
1025 static inline int fcntl_getlk(struct file
*file
, unsigned int cmd
,
1026 struct flock __user
*user
)
1031 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
1032 unsigned int cmd
, struct flock __user
*user
)
1037 #if BITS_PER_LONG == 32
1038 static inline int fcntl_getlk64(struct file
*file
, unsigned int cmd
,
1039 struct flock64 __user
*user
)
1044 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1045 unsigned int cmd
, struct flock64 __user
*user
)
1050 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1055 static inline int fcntl_getlease(struct file
*filp
)
1061 locks_free_lock_context(struct file_lock_context
*ctx
)
1065 static inline void locks_init_lock(struct file_lock
*fl
)
1070 static inline void locks_copy_conflock(struct file_lock
*new, struct file_lock
*fl
)
1075 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1080 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1085 static inline void locks_remove_file(struct file
*filp
)
1090 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1095 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1096 struct file_lock
*conflock
)
1101 static inline int posix_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1106 static inline int posix_unblock_lock(struct file_lock
*waiter
)
1111 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1116 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1117 struct file_lock
*fl
, struct file_lock
*conf
)
1122 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1127 static inline int flock_lock_file_wait(struct file
*filp
,
1128 struct file_lock
*request
)
1133 static inline int __break_lease(struct inode
*inode
, unsigned int mode
, unsigned int type
)
1138 static inline void lease_get_mtime(struct inode
*inode
, struct timespec
*time
)
1143 static inline int generic_setlease(struct file
*filp
, long arg
,
1144 struct file_lock
**flp
, void **priv
)
1149 static inline int vfs_setlease(struct file
*filp
, long arg
,
1150 struct file_lock
**lease
, void **priv
)
1155 static inline int lease_modify(struct file_lock
**before
, int arg
,
1156 struct list_head
*dispose
)
1160 #endif /* !CONFIG_FILE_LOCKING */
1163 struct fasync_struct
{
1167 struct fasync_struct
*fa_next
; /* singly linked list */
1168 struct file
*fa_file
;
1169 struct rcu_head fa_rcu
;
1172 #define FASYNC_MAGIC 0x4601
1174 /* SMP safe fasync helpers: */
1175 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1176 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1177 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1178 extern struct fasync_struct
*fasync_alloc(void);
1179 extern void fasync_free(struct fasync_struct
*);
1181 /* can be called from interrupts */
1182 extern void kill_fasync(struct fasync_struct
**, int, int);
1184 extern void __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1185 extern void f_setown(struct file
*filp
, unsigned long arg
, int force
);
1186 extern void f_delown(struct file
*filp
);
1187 extern pid_t
f_getown(struct file
*filp
);
1188 extern int send_sigurg(struct fown_struct
*fown
);
1196 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1197 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1198 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1199 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1200 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1202 extern struct list_head super_blocks
;
1203 extern spinlock_t sb_lock
;
1205 /* Possible states of 'frozen' field */
1207 SB_UNFROZEN
= 0, /* FS is unfrozen */
1208 SB_FREEZE_WRITE
= 1, /* Writes, dir ops, ioctls frozen */
1209 SB_FREEZE_PAGEFAULT
= 2, /* Page faults stopped as well */
1210 SB_FREEZE_FS
= 3, /* For internal FS use (e.g. to stop
1211 * internal threads if needed) */
1212 SB_FREEZE_COMPLETE
= 4, /* ->freeze_fs finished successfully */
1215 #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
1218 /* Counters for counting writers at each level */
1219 struct percpu_counter counter
[SB_FREEZE_LEVELS
];
1220 wait_queue_head_t wait
; /* queue for waiting for
1221 writers / faults to finish */
1222 int frozen
; /* Is sb frozen? */
1223 wait_queue_head_t wait_unfrozen
; /* queue for waiting for
1225 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1226 struct lockdep_map lock_map
[SB_FREEZE_LEVELS
];
1230 struct super_block
{
1231 struct list_head s_list
; /* Keep this first */
1232 dev_t s_dev
; /* search index; _not_ kdev_t */
1233 unsigned char s_blocksize_bits
;
1234 unsigned long s_blocksize
;
1235 loff_t s_maxbytes
; /* Max file size */
1236 struct file_system_type
*s_type
;
1237 const struct super_operations
*s_op
;
1238 const struct dquot_operations
*dq_op
;
1239 const struct quotactl_ops
*s_qcop
;
1240 const struct export_operations
*s_export_op
;
1241 unsigned long s_flags
;
1242 unsigned long s_magic
;
1243 struct dentry
*s_root
;
1244 struct rw_semaphore s_umount
;
1247 #ifdef CONFIG_SECURITY
1250 const struct xattr_handler
**s_xattr
;
1252 struct list_head s_inodes
; /* all inodes */
1253 struct hlist_bl_head s_anon
; /* anonymous dentries for (nfs) exporting */
1254 struct list_head s_mounts
; /* list of mounts; _not_ for fs use */
1255 struct block_device
*s_bdev
;
1256 struct backing_dev_info
*s_bdi
;
1257 struct mtd_info
*s_mtd
;
1258 struct hlist_node s_instances
;
1259 unsigned int s_quota_types
; /* Bitmask of supported quota types */
1260 struct quota_info s_dquot
; /* Diskquota specific options */
1262 struct sb_writers s_writers
;
1264 char s_id
[32]; /* Informational name */
1265 u8 s_uuid
[16]; /* UUID */
1267 void *s_fs_info
; /* Filesystem private info */
1268 unsigned int s_max_links
;
1271 /* Granularity of c/m/atime in ns.
1272 Cannot be worse than a second */
1276 * The next field is for VFS *only*. No filesystems have any business
1277 * even looking at it. You had been warned.
1279 struct mutex s_vfs_rename_mutex
; /* Kludge */
1282 * Filesystem subtype. If non-empty the filesystem type field
1283 * in /proc/mounts will be "type.subtype"
1288 * Saved mount options for lazy filesystems using
1289 * generic_show_options()
1291 char __rcu
*s_options
;
1292 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1295 * Saved pool identifier for cleancache (-1 means none)
1297 int cleancache_poolid
;
1299 struct shrinker s_shrink
; /* per-sb shrinker handle */
1301 /* Number of inodes with nlink == 0 but still referenced */
1302 atomic_long_t s_remove_count
;
1304 /* Being remounted read-only */
1305 int s_readonly_remount
;
1307 /* AIO completions deferred from interrupt context */
1308 struct workqueue_struct
*s_dio_done_wq
;
1309 struct hlist_head s_pins
;
1312 * Keep the lru lists last in the structure so they always sit on their
1313 * own individual cachelines.
1315 struct list_lru s_dentry_lru ____cacheline_aligned_in_smp
;
1316 struct list_lru s_inode_lru ____cacheline_aligned_in_smp
;
1317 struct rcu_head rcu
;
1320 * Indicates how deep in a filesystem stack this SB is
1325 extern struct timespec
current_fs_time(struct super_block
*sb
);
1328 * Snapshotting support.
1331 void __sb_end_write(struct super_block
*sb
, int level
);
1332 int __sb_start_write(struct super_block
*sb
, int level
, bool wait
);
1335 * sb_end_write - drop write access to a superblock
1336 * @sb: the super we wrote to
1338 * Decrement number of writers to the filesystem. Wake up possible waiters
1339 * wanting to freeze the filesystem.
1341 static inline void sb_end_write(struct super_block
*sb
)
1343 __sb_end_write(sb
, SB_FREEZE_WRITE
);
1347 * sb_end_pagefault - drop write access to a superblock from a page fault
1348 * @sb: the super we wrote to
1350 * Decrement number of processes handling write page fault to the filesystem.
1351 * Wake up possible waiters wanting to freeze the filesystem.
1353 static inline void sb_end_pagefault(struct super_block
*sb
)
1355 __sb_end_write(sb
, SB_FREEZE_PAGEFAULT
);
1359 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
1360 * @sb: the super we wrote to
1362 * Decrement fs-internal number of writers to the filesystem. Wake up possible
1363 * waiters wanting to freeze the filesystem.
1365 static inline void sb_end_intwrite(struct super_block
*sb
)
1367 __sb_end_write(sb
, SB_FREEZE_FS
);
1371 * sb_start_write - get write access to a superblock
1372 * @sb: the super we write to
1374 * When a process wants to write data or metadata to a file system (i.e. dirty
1375 * a page or an inode), it should embed the operation in a sb_start_write() -
1376 * sb_end_write() pair to get exclusion against file system freezing. This
1377 * function increments number of writers preventing freezing. If the file
1378 * system is already frozen, the function waits until the file system is
1381 * Since freeze protection behaves as a lock, users have to preserve
1382 * ordering of freeze protection and other filesystem locks. Generally,
1383 * freeze protection should be the outermost lock. In particular, we have:
1386 * -> i_mutex (write path, truncate, directory ops, ...)
1387 * -> s_umount (freeze_super, thaw_super)
1389 static inline void sb_start_write(struct super_block
*sb
)
1391 __sb_start_write(sb
, SB_FREEZE_WRITE
, true);
1394 static inline int sb_start_write_trylock(struct super_block
*sb
)
1396 return __sb_start_write(sb
, SB_FREEZE_WRITE
, false);
1400 * sb_start_pagefault - get write access to a superblock from a page fault
1401 * @sb: the super we write to
1403 * When a process starts handling write page fault, it should embed the
1404 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
1405 * exclusion against file system freezing. This is needed since the page fault
1406 * is going to dirty a page. This function increments number of running page
1407 * faults preventing freezing. If the file system is already frozen, the
1408 * function waits until the file system is thawed.
1410 * Since page fault freeze protection behaves as a lock, users have to preserve
1411 * ordering of freeze protection and other filesystem locks. It is advised to
1412 * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
1413 * handling code implies lock dependency:
1416 * -> sb_start_pagefault
1418 static inline void sb_start_pagefault(struct super_block
*sb
)
1420 __sb_start_write(sb
, SB_FREEZE_PAGEFAULT
, true);
1424 * sb_start_intwrite - get write access to a superblock for internal fs purposes
1425 * @sb: the super we write to
1427 * This is the third level of protection against filesystem freezing. It is
1428 * free for use by a filesystem. The only requirement is that it must rank
1429 * below sb_start_pagefault.
1431 * For example filesystem can call sb_start_intwrite() when starting a
1432 * transaction which somewhat eases handling of freezing for internal sources
1433 * of filesystem changes (internal fs threads, discarding preallocation on file
1436 static inline void sb_start_intwrite(struct super_block
*sb
)
1438 __sb_start_write(sb
, SB_FREEZE_FS
, true);
1442 extern bool inode_owner_or_capable(const struct inode
*inode
);
1445 * VFS helper functions..
1447 extern int vfs_create(struct inode
*, struct dentry
*, umode_t
, bool);
1448 extern int vfs_mkdir(struct inode
*, struct dentry
*, umode_t
);
1449 extern int vfs_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
1450 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1451 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*, struct inode
**);
1452 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1453 extern int vfs_unlink(struct inode
*, struct dentry
*, struct inode
**);
1454 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*, struct inode
**, unsigned int);
1455 extern int vfs_whiteout(struct inode
*, struct dentry
*);
1458 * VFS dentry helper functions.
1460 extern void dentry_unhash(struct dentry
*dentry
);
1463 * VFS file helper functions.
1465 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1468 * VFS FS_IOC_FIEMAP helper definitions.
1470 struct fiemap_extent_info
{
1471 unsigned int fi_flags
; /* Flags as passed from user */
1472 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1473 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1474 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1475 fiemap_extent array */
1477 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1478 u64 phys
, u64 len
, u32 flags
);
1479 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1484 * NOTE! These match bits 12..15 of stat.st_mode
1485 * (ie "(i_mode >> 12) & 15").
1487 #define DT_UNKNOWN 0
1498 * This is the "filldir" function type, used by readdir() to let
1499 * the kernel specify what kind of dirent layout it wants to have.
1500 * This allows the kernel to read directories into kernel space or
1501 * to have different dirent layouts depending on the binary type.
1504 typedef int (*filldir_t
)(struct dir_context
*, const char *, int, loff_t
, u64
,
1507 struct dir_context
{
1508 const filldir_t actor
;
1512 struct block_device_operations
;
1514 /* These macros are for out of kernel modules to test that
1515 * the kernel supports the unlocked_ioctl and compat_ioctl
1516 * fields in struct file_operations. */
1517 #define HAVE_COMPAT_IOCTL 1
1518 #define HAVE_UNLOCKED_IOCTL 1
1522 struct file_operations
{
1523 struct module
*owner
;
1524 loff_t (*llseek
) (struct file
*, loff_t
, int);
1525 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1526 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1527 ssize_t (*aio_read
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1528 ssize_t (*aio_write
) (struct kiocb
*, const struct iovec
*, unsigned long, loff_t
);
1529 ssize_t (*read_iter
) (struct kiocb
*, struct iov_iter
*);
1530 ssize_t (*write_iter
) (struct kiocb
*, struct iov_iter
*);
1531 int (*iterate
) (struct file
*, struct dir_context
*);
1532 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
1533 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1534 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1535 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1536 void (*mremap
)(struct file
*, struct vm_area_struct
*);
1537 int (*open
) (struct inode
*, struct file
*);
1538 int (*flush
) (struct file
*, fl_owner_t id
);
1539 int (*release
) (struct inode
*, struct file
*);
1540 int (*fsync
) (struct file
*, loff_t
, loff_t
, int datasync
);
1541 int (*aio_fsync
) (struct kiocb
*, int datasync
);
1542 int (*fasync
) (int, struct file
*, int);
1543 int (*lock
) (struct file
*, int, struct file_lock
*);
1544 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1545 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1546 int (*check_flags
)(int);
1547 int (*flock
) (struct file
*, int, struct file_lock
*);
1548 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1549 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1550 int (*setlease
)(struct file
*, long, struct file_lock
**, void **);
1551 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1553 void (*show_fdinfo
)(struct seq_file
*m
, struct file
*f
);
1556 struct inode_operations
{
1557 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, unsigned int);
1558 void * (*follow_link
) (struct dentry
*, struct nameidata
*);
1559 int (*permission
) (struct inode
*, int);
1560 struct posix_acl
* (*get_acl
)(struct inode
*, int);
1562 int (*readlink
) (struct dentry
*, char __user
*,int);
1563 void (*put_link
) (struct dentry
*, struct nameidata
*, void *);
1565 int (*create
) (struct inode
*,struct dentry
*, umode_t
, bool);
1566 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1567 int (*unlink
) (struct inode
*,struct dentry
*);
1568 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1569 int (*mkdir
) (struct inode
*,struct dentry
*,umode_t
);
1570 int (*rmdir
) (struct inode
*,struct dentry
*);
1571 int (*mknod
) (struct inode
*,struct dentry
*,umode_t
,dev_t
);
1572 int (*rename
) (struct inode
*, struct dentry
*,
1573 struct inode
*, struct dentry
*);
1574 int (*rename2
) (struct inode
*, struct dentry
*,
1575 struct inode
*, struct dentry
*, unsigned int);
1576 int (*setattr
) (struct dentry
*, struct iattr
*);
1577 int (*getattr
) (struct vfsmount
*mnt
, struct dentry
*, struct kstat
*);
1578 int (*setxattr
) (struct dentry
*, const char *,const void *,size_t,int);
1579 ssize_t (*getxattr
) (struct dentry
*, const char *, void *, size_t);
1580 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1581 int (*removexattr
) (struct dentry
*, const char *);
1582 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1584 int (*update_time
)(struct inode
*, struct timespec
*, int);
1585 int (*atomic_open
)(struct inode
*, struct dentry
*,
1586 struct file
*, unsigned open_flag
,
1587 umode_t create_mode
, int *opened
);
1588 int (*tmpfile
) (struct inode
*, struct dentry
*, umode_t
);
1589 int (*set_acl
)(struct inode
*, struct posix_acl
*, int);
1591 /* WARNING: probably going away soon, do not use! */
1592 int (*dentry_open
)(struct dentry
*, struct file
*, const struct cred
*);
1593 } ____cacheline_aligned
;
1595 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1596 unsigned long nr_segs
, unsigned long fast_segs
,
1597 struct iovec
*fast_pointer
,
1598 struct iovec
**ret_pointer
);
1600 extern ssize_t
__vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1601 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1602 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1603 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1604 unsigned long, loff_t
*);
1605 extern ssize_t
vfs_writev(struct file
*, const struct iovec __user
*,
1606 unsigned long, loff_t
*);
1608 struct super_operations
{
1609 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1610 void (*destroy_inode
)(struct inode
*);
1612 void (*dirty_inode
) (struct inode
*, int flags
);
1613 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1614 int (*drop_inode
) (struct inode
*);
1615 void (*evict_inode
) (struct inode
*);
1616 void (*put_super
) (struct super_block
*);
1617 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1618 int (*freeze_super
) (struct super_block
*);
1619 int (*freeze_fs
) (struct super_block
*);
1620 int (*thaw_super
) (struct super_block
*);
1621 int (*unfreeze_fs
) (struct super_block
*);
1622 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1623 int (*remount_fs
) (struct super_block
*, int *, char *);
1624 void (*umount_begin
) (struct super_block
*);
1626 int (*show_options
)(struct seq_file
*, struct dentry
*);
1627 int (*show_devname
)(struct seq_file
*, struct dentry
*);
1628 int (*show_path
)(struct seq_file
*, struct dentry
*);
1629 int (*show_stats
)(struct seq_file
*, struct dentry
*);
1631 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1632 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1633 struct dquot
**(*get_dquots
)(struct inode
*);
1635 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1636 long (*nr_cached_objects
)(struct super_block
*, int);
1637 long (*free_cached_objects
)(struct super_block
*, long, int);
1641 * Inode flags - they have no relation to superblock flags now
1643 #define S_SYNC 1 /* Writes are synced at once */
1644 #define S_NOATIME 2 /* Do not update access times */
1645 #define S_APPEND 4 /* Append-only file */
1646 #define S_IMMUTABLE 8 /* Immutable file */
1647 #define S_DEAD 16 /* removed, but still open directory */
1648 #define S_NOQUOTA 32 /* Inode is not counted to quota */
1649 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
1650 #define S_NOCMTIME 128 /* Do not update file c/mtime */
1651 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
1652 #define S_PRIVATE 512 /* Inode is fs-internal */
1653 #define S_IMA 1024 /* Inode has an associated IMA struct */
1654 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
1655 #define S_NOSEC 4096 /* no suid or xattr security attributes */
1658 * Note that nosuid etc flags are inode-specific: setting some file-system
1659 * flags just means all the inodes inherit those flags by default. It might be
1660 * possible to override it selectively if you really wanted to with some
1661 * ioctl() that is not currently implemented.
1663 * Exception: MS_RDONLY is always applied to the entire file system.
1665 * Unfortunately, it is possible to change a filesystems flags with it mounted
1666 * with files in use. This means that all of the inodes will not have their
1667 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
1668 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
1670 #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg))
1672 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
1673 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
1674 ((inode)->i_flags & S_SYNC))
1675 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
1676 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
1677 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
1678 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
1679 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
1681 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
1682 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
1683 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
1684 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
1686 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
1687 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
1688 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
1689 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
1690 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
1691 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
1692 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
1694 #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \
1695 (inode)->i_rdev == WHITEOUT_DEV)
1698 * Inode state bits. Protected by inode->i_lock
1700 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1701 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1703 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1704 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1705 * various stages of removing an inode.
1707 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1709 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1710 * fdatasync(). i_atime is the usual cause.
1711 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1712 * these changes separately from I_DIRTY_SYNC so that we
1713 * don't have to write inode on fdatasync() when only
1714 * mtime has changed in it.
1715 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1716 * I_NEW Serves as both a mutex and completion notification.
1717 * New inodes set I_NEW. If two processes both create
1718 * the same inode, one of them will release its inode and
1719 * wait for I_NEW to be released before returning.
1720 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1721 * also cause waiting on I_NEW, without I_NEW actually
1722 * being set. find_inode() uses this to prevent returning
1723 * nearly-dead inodes.
1724 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1725 * is zero. I_FREEING must be set when I_WILL_FREE is
1727 * I_FREEING Set when inode is about to be freed but still has dirty
1728 * pages or buffers attached or the inode itself is still
1730 * I_CLEAR Added by clear_inode(). In this state the inode is
1731 * clean and can be destroyed. Inode keeps I_FREEING.
1733 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1734 * prohibited for many purposes. iget() must wait for
1735 * the inode to be completely released, then create it
1736 * anew. Other functions will just ignore such inodes,
1737 * if appropriate. I_NEW is used for waiting.
1739 * I_SYNC Writeback of inode is running. The bit is set during
1740 * data writeback, and cleared with a wakeup on the bit
1741 * address once it is done. The bit is also used to pin
1742 * the inode in memory for flusher thread.
1744 * I_REFERENCED Marks the inode as recently references on the LRU list.
1746 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1748 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1750 #define I_DIRTY_SYNC (1 << 0)
1751 #define I_DIRTY_DATASYNC (1 << 1)
1752 #define I_DIRTY_PAGES (1 << 2)
1754 #define I_NEW (1 << __I_NEW)
1755 #define I_WILL_FREE (1 << 4)
1756 #define I_FREEING (1 << 5)
1757 #define I_CLEAR (1 << 6)
1759 #define I_SYNC (1 << __I_SYNC)
1760 #define I_REFERENCED (1 << 8)
1761 #define __I_DIO_WAKEUP 9
1762 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1763 #define I_LINKABLE (1 << 10)
1765 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1767 extern void __mark_inode_dirty(struct inode
*, int);
1768 static inline void mark_inode_dirty(struct inode
*inode
)
1770 __mark_inode_dirty(inode
, I_DIRTY
);
1773 static inline void mark_inode_dirty_sync(struct inode
*inode
)
1775 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
1778 extern void inc_nlink(struct inode
*inode
);
1779 extern void drop_nlink(struct inode
*inode
);
1780 extern void clear_nlink(struct inode
*inode
);
1781 extern void set_nlink(struct inode
*inode
, unsigned int nlink
);
1783 static inline void inode_inc_link_count(struct inode
*inode
)
1786 mark_inode_dirty(inode
);
1789 static inline void inode_dec_link_count(struct inode
*inode
)
1792 mark_inode_dirty(inode
);
1796 * inode_inc_iversion - increments i_version
1797 * @inode: inode that need to be updated
1799 * Every time the inode is modified, the i_version field will be incremented.
1800 * The filesystem has to be mounted with i_version flag
1803 static inline void inode_inc_iversion(struct inode
*inode
)
1805 spin_lock(&inode
->i_lock
);
1807 spin_unlock(&inode
->i_lock
);
1810 enum file_time_flags
{
1817 extern void touch_atime(const struct path
*);
1818 static inline void file_accessed(struct file
*file
)
1820 if (!(file
->f_flags
& O_NOATIME
))
1821 touch_atime(&file
->f_path
);
1824 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
1825 int sync_inode_metadata(struct inode
*inode
, int wait
);
1827 struct file_system_type
{
1830 #define FS_REQUIRES_DEV 1
1831 #define FS_BINARY_MOUNTDATA 2
1832 #define FS_HAS_SUBTYPE 4
1833 #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */
1834 #define FS_USERNS_DEV_MOUNT 16 /* A userns mount does not imply MNT_NODEV */
1835 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */
1836 struct dentry
*(*mount
) (struct file_system_type
*, int,
1837 const char *, void *);
1838 void (*kill_sb
) (struct super_block
*);
1839 struct module
*owner
;
1840 struct file_system_type
* next
;
1841 struct hlist_head fs_supers
;
1843 struct lock_class_key s_lock_key
;
1844 struct lock_class_key s_umount_key
;
1845 struct lock_class_key s_vfs_rename_key
;
1846 struct lock_class_key s_writers_key
[SB_FREEZE_LEVELS
];
1848 struct lock_class_key i_lock_key
;
1849 struct lock_class_key i_mutex_key
;
1850 struct lock_class_key i_mutex_dir_key
;
1853 #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)
1855 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
, int flags
,
1856 void *data
, int (*fill_super
)(struct super_block
*, void *, int));
1857 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
1858 int flags
, const char *dev_name
, void *data
,
1859 int (*fill_super
)(struct super_block
*, void *, int));
1860 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
1861 int flags
, void *data
,
1862 int (*fill_super
)(struct super_block
*, void *, int));
1863 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
1864 int flags
, void *data
,
1865 int (*fill_super
)(struct super_block
*, void *, int));
1866 extern struct dentry
*mount_subtree(struct vfsmount
*mnt
, const char *path
);
1867 void generic_shutdown_super(struct super_block
*sb
);
1868 void kill_block_super(struct super_block
*sb
);
1869 void kill_anon_super(struct super_block
*sb
);
1870 void kill_litter_super(struct super_block
*sb
);
1871 void deactivate_super(struct super_block
*sb
);
1872 void deactivate_locked_super(struct super_block
*sb
);
1873 int set_anon_super(struct super_block
*s
, void *data
);
1874 int get_anon_bdev(dev_t
*);
1875 void free_anon_bdev(dev_t
);
1876 struct super_block
*sget(struct file_system_type
*type
,
1877 int (*test
)(struct super_block
*,void *),
1878 int (*set
)(struct super_block
*,void *),
1879 int flags
, void *data
);
1880 extern struct dentry
*mount_pseudo(struct file_system_type
*, char *,
1881 const struct super_operations
*ops
,
1882 const struct dentry_operations
*dops
,
1885 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1886 #define fops_get(fops) \
1887 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1888 #define fops_put(fops) \
1889 do { if (fops) module_put((fops)->owner); } while(0)
1891 * This one is to be used *ONLY* from ->open() instances.
1892 * fops must be non-NULL, pinned down *and* module dependencies
1893 * should be sufficient to pin the caller down as well.
1895 #define replace_fops(f, fops) \
1897 struct file *__file = (f); \
1898 fops_put(__file->f_op); \
1899 BUG_ON(!(__file->f_op = (fops))); \
1902 extern int register_filesystem(struct file_system_type
*);
1903 extern int unregister_filesystem(struct file_system_type
*);
1904 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
1905 #define kern_mount(type) kern_mount_data(type, NULL)
1906 extern void kern_unmount(struct vfsmount
*mnt
);
1907 extern int may_umount_tree(struct vfsmount
*);
1908 extern int may_umount(struct vfsmount
*);
1909 extern long do_mount(const char *, const char __user
*,
1910 const char *, unsigned long, void *);
1911 extern struct vfsmount
*collect_mounts(struct path
*);
1912 extern void drop_collected_mounts(struct vfsmount
*);
1913 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
1915 extern int vfs_statfs(struct path
*, struct kstatfs
*);
1916 extern int user_statfs(const char __user
*, struct kstatfs
*);
1917 extern int fd_statfs(int, struct kstatfs
*);
1918 extern int vfs_ustat(dev_t
, struct kstatfs
*);
1919 extern int freeze_super(struct super_block
*super
);
1920 extern int thaw_super(struct super_block
*super
);
1921 extern bool our_mnt(struct vfsmount
*mnt
);
1922 extern bool fs_fully_visible(struct file_system_type
*);
1924 extern int current_umask(void);
1926 extern void ihold(struct inode
* inode
);
1927 extern void iput(struct inode
*);
1929 static inline struct inode
*file_inode(const struct file
*f
)
1935 extern struct kobject
*fs_kobj
;
1937 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1939 #define FLOCK_VERIFY_READ 1
1940 #define FLOCK_VERIFY_WRITE 2
1942 #ifdef CONFIG_FILE_LOCKING
1943 extern int locks_mandatory_locked(struct file
*);
1944 extern int locks_mandatory_area(int, struct inode
*, struct file
*, loff_t
, size_t);
1947 * Candidates for mandatory locking have the setgid bit set
1948 * but no group execute bit - an otherwise meaningless combination.
1951 static inline int __mandatory_lock(struct inode
*ino
)
1953 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
1957 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1958 * otherwise these will be advisory locks
1961 static inline int mandatory_lock(struct inode
*ino
)
1963 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
1966 static inline int locks_verify_locked(struct file
*file
)
1968 if (mandatory_lock(file_inode(file
)))
1969 return locks_mandatory_locked(file
);
1973 static inline int locks_verify_truncate(struct inode
*inode
,
1977 if (inode
->i_flctx
&& mandatory_lock(inode
))
1978 return locks_mandatory_area(
1979 FLOCK_VERIFY_WRITE
, inode
, filp
,
1980 size
< inode
->i_size
? size
: inode
->i_size
,
1981 (size
< inode
->i_size
? inode
->i_size
- size
1982 : size
- inode
->i_size
)
1987 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
1990 * Since this check is lockless, we must ensure that any refcounts
1991 * taken are done before checking inode->i_flock. Otherwise, we could
1992 * end up racing with tasks trying to set a new lease on this file.
1995 if (inode
->i_flctx
&& !list_empty_careful(&inode
->i_flctx
->flc_lease
))
1996 return __break_lease(inode
, mode
, FL_LEASE
);
2000 static inline int break_deleg(struct inode
*inode
, unsigned int mode
)
2003 * Since this check is lockless, we must ensure that any refcounts
2004 * taken are done before checking inode->i_flock. Otherwise, we could
2005 * end up racing with tasks trying to set a new lease on this file.
2008 if (inode
->i_flctx
&& !list_empty_careful(&inode
->i_flctx
->flc_lease
))
2009 return __break_lease(inode
, mode
, FL_DELEG
);
2013 static inline int try_break_deleg(struct inode
*inode
, struct inode
**delegated_inode
)
2017 ret
= break_deleg(inode
, O_WRONLY
|O_NONBLOCK
);
2018 if (ret
== -EWOULDBLOCK
&& delegated_inode
) {
2019 *delegated_inode
= inode
;
2025 static inline int break_deleg_wait(struct inode
**delegated_inode
)
2029 ret
= break_deleg(*delegated_inode
, O_WRONLY
);
2030 iput(*delegated_inode
);
2031 *delegated_inode
= NULL
;
2035 #else /* !CONFIG_FILE_LOCKING */
2036 static inline int locks_mandatory_locked(struct file
*file
)
2041 static inline int locks_mandatory_area(int rw
, struct inode
*inode
,
2042 struct file
*filp
, loff_t offset
,
2048 static inline int __mandatory_lock(struct inode
*inode
)
2053 static inline int mandatory_lock(struct inode
*inode
)
2058 static inline int locks_verify_locked(struct file
*file
)
2063 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
2069 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2074 static inline int break_deleg(struct inode
*inode
, unsigned int mode
)
2079 static inline int try_break_deleg(struct inode
*inode
, struct inode
**delegated_inode
)
2084 static inline int break_deleg_wait(struct inode
**delegated_inode
)
2090 #endif /* CONFIG_FILE_LOCKING */
2095 const char *name
; /* pointer to actual string */
2096 const __user
char *uptr
; /* original userland pointer */
2097 struct audit_names
*aname
;
2098 bool separate
; /* should "name" be freed? */
2101 extern long vfs_truncate(struct path
*, loff_t
);
2102 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
2104 extern int vfs_fallocate(struct file
*file
, int mode
, loff_t offset
,
2106 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
2108 extern struct file
*file_open_name(struct filename
*, int, umode_t
);
2109 extern struct file
*filp_open(const char *, int, umode_t
);
2110 extern struct file
*file_open_root(struct dentry
*, struct vfsmount
*,
2112 extern int vfs_open(const struct path
*, struct file
*, const struct cred
*);
2113 extern struct file
* dentry_open(const struct path
*, int, const struct cred
*);
2114 extern int filp_close(struct file
*, fl_owner_t id
);
2116 extern struct filename
*getname_flags(const char __user
*, int, int *);
2117 extern struct filename
*getname(const char __user
*);
2118 extern struct filename
*getname_kernel(const char *);
2124 extern int finish_open(struct file
*file
, struct dentry
*dentry
,
2125 int (*open
)(struct inode
*, struct file
*),
2127 extern int finish_no_open(struct file
*file
, struct dentry
*dentry
);
2131 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
2134 extern void __init
vfs_caches_init_early(void);
2135 extern void __init
vfs_caches_init(unsigned long);
2137 extern struct kmem_cache
*names_cachep
;
2139 extern void final_putname(struct filename
*name
);
2141 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
2142 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2143 #ifndef CONFIG_AUDITSYSCALL
2144 #define putname(name) final_putname(name)
2146 extern void putname(struct filename
*name
);
2150 extern int register_blkdev(unsigned int, const char *);
2151 extern void unregister_blkdev(unsigned int, const char *);
2152 extern struct block_device
*bdget(dev_t
);
2153 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2154 extern void bd_set_size(struct block_device
*, loff_t size
);
2155 extern void bd_forget(struct inode
*inode
);
2156 extern void bdput(struct block_device
*);
2157 extern void invalidate_bdev(struct block_device
*);
2158 extern void iterate_bdevs(void (*)(struct block_device
*, void *), void *);
2159 extern int sync_blockdev(struct block_device
*bdev
);
2160 extern void kill_bdev(struct block_device
*);
2161 extern struct super_block
*freeze_bdev(struct block_device
*);
2162 extern void emergency_thaw_all(void);
2163 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2164 extern int fsync_bdev(struct block_device
*);
2165 extern int sb_is_blkdev_sb(struct super_block
*sb
);
2167 static inline void bd_forget(struct inode
*inode
) {}
2168 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2169 static inline void kill_bdev(struct block_device
*bdev
) {}
2170 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2172 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2177 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2182 static inline void iterate_bdevs(void (*f
)(struct block_device
*, void *), void *arg
)
2186 static inline int sb_is_blkdev_sb(struct super_block
*sb
)
2191 extern int sync_filesystem(struct super_block
*);
2192 extern const struct file_operations def_blk_fops
;
2193 extern const struct file_operations def_chr_fops
;
2195 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2196 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2197 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2198 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2199 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2201 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2203 extern void blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2205 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2206 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2207 struct gendisk
*disk
);
2209 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2210 struct gendisk
*disk
)
2214 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2215 struct gendisk
*disk
)
2222 #define CHRDEV_MAJOR_HASH_SIZE 255
2223 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2224 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2225 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2226 unsigned int count
, const char *name
,
2227 const struct file_operations
*fops
);
2228 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2229 unsigned int count
, const char *name
);
2230 extern void unregister_chrdev_region(dev_t
, unsigned);
2231 extern void chrdev_show(struct seq_file
*,off_t
);
2233 static inline int register_chrdev(unsigned int major
, const char *name
,
2234 const struct file_operations
*fops
)
2236 return __register_chrdev(major
, 0, 256, name
, fops
);
2239 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2241 __unregister_chrdev(major
, 0, 256, name
);
2244 /* fs/block_dev.c */
2245 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2246 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2249 #define BLKDEV_MAJOR_HASH_SIZE 255
2250 extern const char *__bdevname(dev_t
, char *buffer
);
2251 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2252 extern struct block_device
*lookup_bdev(const char *);
2253 extern void blkdev_show(struct seq_file
*,off_t
);
2256 #define BLKDEV_MAJOR_HASH_SIZE 0
2259 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2261 /* Invalid inode operations -- fs/bad_inode.c */
2262 extern void make_bad_inode(struct inode
*);
2263 extern int is_bad_inode(struct inode
*);
2267 * return READ, READA, or WRITE
2269 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2272 * return data direction, READ or WRITE
2274 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2276 extern void check_disk_size_change(struct gendisk
*disk
,
2277 struct block_device
*bdev
);
2278 extern int revalidate_disk(struct gendisk
*);
2279 extern int check_disk_change(struct block_device
*);
2280 extern int __invalidate_device(struct block_device
*, bool);
2281 extern int invalidate_partition(struct gendisk
*, int);
2283 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2284 pgoff_t start
, pgoff_t end
);
2286 static inline void invalidate_remote_inode(struct inode
*inode
)
2288 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2289 S_ISLNK(inode
->i_mode
))
2290 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2292 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2293 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2294 pgoff_t start
, pgoff_t end
);
2295 extern int write_inode_now(struct inode
*, int);
2296 extern int filemap_fdatawrite(struct address_space
*);
2297 extern int filemap_flush(struct address_space
*);
2298 extern int filemap_fdatawait(struct address_space
*);
2299 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2301 extern int filemap_write_and_wait(struct address_space
*mapping
);
2302 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2303 loff_t lstart
, loff_t lend
);
2304 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2305 loff_t start
, loff_t end
, int sync_mode
);
2306 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2307 loff_t start
, loff_t end
);
2309 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2311 extern int vfs_fsync(struct file
*file
, int datasync
);
2312 static inline int generic_write_sync(struct file
*file
, loff_t pos
, loff_t count
)
2314 if (!(file
->f_flags
& O_DSYNC
) && !IS_SYNC(file
->f_mapping
->host
))
2316 return vfs_fsync_range(file
, pos
, pos
+ count
- 1,
2317 (file
->f_flags
& __O_SYNC
) ? 0 : 1);
2319 extern void emergency_sync(void);
2320 extern void emergency_remount(void);
2322 extern sector_t
bmap(struct inode
*, sector_t
);
2324 extern int notify_change(struct dentry
*, struct iattr
*, struct inode
**);
2325 extern int inode_permission(struct inode
*, int);
2326 extern int __inode_permission(struct inode
*, int);
2327 extern int generic_permission(struct inode
*, int);
2328 extern int __check_sticky(struct inode
*dir
, struct inode
*inode
);
2330 static inline bool execute_ok(struct inode
*inode
)
2332 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2335 static inline void file_start_write(struct file
*file
)
2337 if (!S_ISREG(file_inode(file
)->i_mode
))
2339 __sb_start_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
, true);
2342 static inline bool file_start_write_trylock(struct file
*file
)
2344 if (!S_ISREG(file_inode(file
)->i_mode
))
2346 return __sb_start_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
, false);
2349 static inline void file_end_write(struct file
*file
)
2351 if (!S_ISREG(file_inode(file
)->i_mode
))
2353 __sb_end_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
);
2357 * get_write_access() gets write permission for a file.
2358 * put_write_access() releases this write permission.
2359 * This is used for regular files.
2360 * We cannot support write (and maybe mmap read-write shared) accesses and
2361 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2362 * can have the following values:
2363 * 0: no writers, no VM_DENYWRITE mappings
2364 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2365 * > 0: (i_writecount) users are writing to the file.
2367 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2368 * except for the cases where we don't hold i_writecount yet. Then we need to
2369 * use {get,deny}_write_access() - these functions check the sign and refuse
2370 * to do the change if sign is wrong.
2372 static inline int get_write_access(struct inode
*inode
)
2374 return atomic_inc_unless_negative(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2376 static inline int deny_write_access(struct file
*file
)
2378 struct inode
*inode
= file_inode(file
);
2379 return atomic_dec_unless_positive(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2381 static inline void put_write_access(struct inode
* inode
)
2383 atomic_dec(&inode
->i_writecount
);
2385 static inline void allow_write_access(struct file
*file
)
2388 atomic_inc(&file_inode(file
)->i_writecount
);
2390 static inline bool inode_is_open_for_write(const struct inode
*inode
)
2392 return atomic_read(&inode
->i_writecount
) > 0;
2396 static inline void i_readcount_dec(struct inode
*inode
)
2398 BUG_ON(!atomic_read(&inode
->i_readcount
));
2399 atomic_dec(&inode
->i_readcount
);
2401 static inline void i_readcount_inc(struct inode
*inode
)
2403 atomic_inc(&inode
->i_readcount
);
2406 static inline void i_readcount_dec(struct inode
*inode
)
2410 static inline void i_readcount_inc(struct inode
*inode
)
2415 extern int do_pipe_flags(int *, int);
2417 extern int kernel_read(struct file
*, loff_t
, char *, unsigned long);
2418 extern ssize_t
kernel_write(struct file
*, const char *, size_t, loff_t
);
2419 extern ssize_t
__kernel_write(struct file
*, const char *, size_t, loff_t
*);
2420 extern struct file
* open_exec(const char *);
2422 /* fs/dcache.c -- generic fs support functions */
2423 extern int is_subdir(struct dentry
*, struct dentry
*);
2424 extern int path_is_under(struct path
*, struct path
*);
2426 #include <linux/err.h>
2428 /* needed for stackable file system support */
2429 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int whence
);
2431 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int whence
);
2433 extern int inode_init_always(struct super_block
*, struct inode
*);
2434 extern void inode_init_once(struct inode
*);
2435 extern void address_space_init_once(struct address_space
*mapping
);
2436 extern struct inode
* igrab(struct inode
*);
2437 extern ino_t
iunique(struct super_block
*, ino_t
);
2438 extern int inode_needs_sync(struct inode
*inode
);
2439 extern int generic_delete_inode(struct inode
*inode
);
2440 static inline int generic_drop_inode(struct inode
*inode
)
2442 return !inode
->i_nlink
|| inode_unhashed(inode
);
2445 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2446 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2448 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2449 int (*test
)(struct inode
*, void *), void *data
);
2450 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2452 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2453 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2454 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2455 extern int insert_inode_locked(struct inode
*);
2456 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2457 extern void lockdep_annotate_inode_mutex_key(struct inode
*inode
);
2459 static inline void lockdep_annotate_inode_mutex_key(struct inode
*inode
) { };
2461 extern void unlock_new_inode(struct inode
*);
2462 extern unsigned int get_next_ino(void);
2464 extern void __iget(struct inode
* inode
);
2465 extern void iget_failed(struct inode
*);
2466 extern void clear_inode(struct inode
*);
2467 extern void __destroy_inode(struct inode
*);
2468 extern struct inode
*new_inode_pseudo(struct super_block
*sb
);
2469 extern struct inode
*new_inode(struct super_block
*sb
);
2470 extern void free_inode_nonrcu(struct inode
*inode
);
2471 extern int should_remove_suid(struct dentry
*);
2472 extern int file_remove_suid(struct file
*);
2474 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2475 static inline void insert_inode_hash(struct inode
*inode
)
2477 __insert_inode_hash(inode
, inode
->i_ino
);
2480 extern void __remove_inode_hash(struct inode
*);
2481 static inline void remove_inode_hash(struct inode
*inode
)
2483 if (!inode_unhashed(inode
))
2484 __remove_inode_hash(inode
);
2487 extern void inode_sb_list_add(struct inode
*inode
);
2490 extern void submit_bio(int, struct bio
*);
2491 extern int bdev_read_only(struct block_device
*);
2493 extern int set_blocksize(struct block_device
*, int);
2494 extern int sb_set_blocksize(struct super_block
*, int);
2495 extern int sb_min_blocksize(struct super_block
*, int);
2497 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2498 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2499 extern int generic_file_remap_pages(struct vm_area_struct
*, unsigned long addr
,
2500 unsigned long size
, pgoff_t pgoff
);
2501 int generic_write_checks(struct file
*file
, loff_t
*pos
, size_t *count
, int isblk
);
2502 extern ssize_t
generic_file_read_iter(struct kiocb
*, struct iov_iter
*);
2503 extern ssize_t
__generic_file_write_iter(struct kiocb
*, struct iov_iter
*);
2504 extern ssize_t
generic_file_write_iter(struct kiocb
*, struct iov_iter
*);
2505 extern ssize_t
generic_file_direct_write(struct kiocb
*, struct iov_iter
*, loff_t
);
2506 extern ssize_t
generic_perform_write(struct file
*, struct iov_iter
*, loff_t
);
2507 extern ssize_t
do_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2508 extern ssize_t
do_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2509 extern ssize_t
new_sync_read(struct file
*filp
, char __user
*buf
, size_t len
, loff_t
*ppos
);
2510 extern ssize_t
new_sync_write(struct file
*filp
, const char __user
*buf
, size_t len
, loff_t
*ppos
);
2512 /* fs/block_dev.c */
2513 extern ssize_t
blkdev_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
);
2514 extern ssize_t
blkdev_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
);
2515 extern int blkdev_fsync(struct file
*filp
, loff_t start
, loff_t end
,
2517 extern void block_sync_page(struct page
*page
);
2520 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
2521 struct pipe_inode_info
*, size_t, unsigned int);
2522 extern ssize_t
default_file_splice_read(struct file
*, loff_t
*,
2523 struct pipe_inode_info
*, size_t, unsigned int);
2524 extern ssize_t
iter_file_splice_write(struct pipe_inode_info
*,
2525 struct file
*, loff_t
*, size_t, unsigned int);
2526 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
2527 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
2528 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
2529 loff_t
*opos
, size_t len
, unsigned int flags
);
2533 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
2534 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int whence
);
2535 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int whence
);
2536 extern loff_t
vfs_setpos(struct file
*file
, loff_t offset
, loff_t maxsize
);
2537 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int whence
);
2538 extern loff_t
generic_file_llseek_size(struct file
*file
, loff_t offset
,
2539 int whence
, loff_t maxsize
, loff_t eof
);
2540 extern loff_t
fixed_size_llseek(struct file
*file
, loff_t offset
,
2541 int whence
, loff_t size
);
2542 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
2543 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
2545 #ifdef CONFIG_FS_XIP
2546 extern ssize_t
xip_file_read(struct file
*filp
, char __user
*buf
, size_t len
,
2548 extern int xip_file_mmap(struct file
* file
, struct vm_area_struct
* vma
);
2549 extern ssize_t
xip_file_write(struct file
*filp
, const char __user
*buf
,
2550 size_t len
, loff_t
*ppos
);
2551 extern int xip_truncate_page(struct address_space
*mapping
, loff_t from
);
2553 static inline int xip_truncate_page(struct address_space
*mapping
, loff_t from
)
2560 typedef void (dio_submit_t
)(int rw
, struct bio
*bio
, struct inode
*inode
,
2561 loff_t file_offset
);
2564 /* need locking between buffered and direct access */
2567 /* filesystem does not support filling holes */
2568 DIO_SKIP_HOLES
= 0x02,
2570 /* filesystem can handle aio writes beyond i_size */
2571 DIO_ASYNC_EXTEND
= 0x04,
2574 void dio_end_io(struct bio
*bio
, int error
);
2576 ssize_t
__blockdev_direct_IO(int rw
, struct kiocb
*iocb
, struct inode
*inode
,
2577 struct block_device
*bdev
, struct iov_iter
*iter
, loff_t offset
,
2578 get_block_t get_block
, dio_iodone_t end_io
,
2579 dio_submit_t submit_io
, int flags
);
2581 static inline ssize_t
blockdev_direct_IO(int rw
, struct kiocb
*iocb
,
2582 struct inode
*inode
, struct iov_iter
*iter
, loff_t offset
,
2583 get_block_t get_block
)
2585 return __blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iter
,
2586 offset
, get_block
, NULL
, NULL
,
2587 DIO_LOCKING
| DIO_SKIP_HOLES
);
2591 void inode_dio_wait(struct inode
*inode
);
2592 void inode_dio_done(struct inode
*inode
);
2594 extern void inode_set_flags(struct inode
*inode
, unsigned int flags
,
2597 extern const struct file_operations generic_ro_fops
;
2599 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2601 extern int readlink_copy(char __user
*, int, const char *);
2602 extern int page_readlink(struct dentry
*, char __user
*, int);
2603 extern void *page_follow_link_light(struct dentry
*, struct nameidata
*);
2604 extern void page_put_link(struct dentry
*, struct nameidata
*, void *);
2605 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
2607 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
2608 extern const struct inode_operations page_symlink_inode_operations
;
2609 extern void kfree_put_link(struct dentry
*, struct nameidata
*, void *);
2610 extern int generic_readlink(struct dentry
*, char __user
*, int);
2611 extern void generic_fillattr(struct inode
*, struct kstat
*);
2612 int vfs_getattr_nosec(struct path
*path
, struct kstat
*stat
);
2613 extern int vfs_getattr(struct path
*, struct kstat
*);
2614 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2615 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
2616 void __inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2617 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
2618 loff_t
inode_get_bytes(struct inode
*inode
);
2619 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
2621 extern int vfs_readdir(struct file
*, filldir_t
, void *);
2622 extern int iterate_dir(struct file
*, struct dir_context
*);
2624 extern int vfs_stat(const char __user
*, struct kstat
*);
2625 extern int vfs_lstat(const char __user
*, struct kstat
*);
2626 extern int vfs_fstat(unsigned int, struct kstat
*);
2627 extern int vfs_fstatat(int , const char __user
*, struct kstat
*, int);
2629 extern int do_vfs_ioctl(struct file
*filp
, unsigned int fd
, unsigned int cmd
,
2631 extern int __generic_block_fiemap(struct inode
*inode
,
2632 struct fiemap_extent_info
*fieinfo
,
2633 loff_t start
, loff_t len
,
2634 get_block_t
*get_block
);
2635 extern int generic_block_fiemap(struct inode
*inode
,
2636 struct fiemap_extent_info
*fieinfo
, u64 start
,
2637 u64 len
, get_block_t
*get_block
);
2639 extern void get_filesystem(struct file_system_type
*fs
);
2640 extern void put_filesystem(struct file_system_type
*fs
);
2641 extern struct file_system_type
*get_fs_type(const char *name
);
2642 extern struct super_block
*get_super(struct block_device
*);
2643 extern struct super_block
*get_super_thawed(struct block_device
*);
2644 extern struct super_block
*get_active_super(struct block_device
*bdev
);
2645 extern void drop_super(struct super_block
*sb
);
2646 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
2647 extern void iterate_supers_type(struct file_system_type
*,
2648 void (*)(struct super_block
*, void *), void *);
2650 extern int dcache_dir_open(struct inode
*, struct file
*);
2651 extern int dcache_dir_close(struct inode
*, struct file
*);
2652 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
2653 extern int dcache_readdir(struct file
*, struct dir_context
*);
2654 extern int simple_setattr(struct dentry
*, struct iattr
*);
2655 extern int simple_getattr(struct vfsmount
*, struct dentry
*, struct kstat
*);
2656 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
2657 extern int simple_open(struct inode
*inode
, struct file
*file
);
2658 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
2659 extern int simple_unlink(struct inode
*, struct dentry
*);
2660 extern int simple_rmdir(struct inode
*, struct dentry
*);
2661 extern int simple_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
2662 extern int noop_fsync(struct file
*, loff_t
, loff_t
, int);
2663 extern int simple_empty(struct dentry
*);
2664 extern int simple_readpage(struct file
*file
, struct page
*page
);
2665 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
2666 loff_t pos
, unsigned len
, unsigned flags
,
2667 struct page
**pagep
, void **fsdata
);
2668 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
2669 loff_t pos
, unsigned len
, unsigned copied
,
2670 struct page
*page
, void *fsdata
);
2671 extern int always_delete_dentry(const struct dentry
*);
2672 extern struct inode
*alloc_anon_inode(struct super_block
*);
2673 extern int simple_nosetlease(struct file
*, long, struct file_lock
**, void **);
2674 extern const struct dentry_operations simple_dentry_operations
;
2676 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, unsigned int flags
);
2677 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
2678 extern const struct file_operations simple_dir_operations
;
2679 extern const struct inode_operations simple_dir_inode_operations
;
2680 struct tree_descr
{ char *name
; const struct file_operations
*ops
; int mode
; };
2681 struct dentry
*d_alloc_name(struct dentry
*, const char *);
2682 extern int simple_fill_super(struct super_block
*, unsigned long, struct tree_descr
*);
2683 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
2684 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
2686 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
2687 loff_t
*ppos
, const void *from
, size_t available
);
2688 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
2689 const void __user
*from
, size_t count
);
2691 extern int __generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2692 extern int generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
2694 extern int generic_check_addressable(unsigned, u64
);
2696 #ifdef CONFIG_MIGRATION
2697 extern int buffer_migrate_page(struct address_space
*,
2698 struct page
*, struct page
*,
2701 #define buffer_migrate_page NULL
2704 extern int inode_change_ok(const struct inode
*, struct iattr
*);
2705 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
2706 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
2708 extern int file_update_time(struct file
*file
);
2710 extern int generic_show_options(struct seq_file
*m
, struct dentry
*root
);
2711 extern void save_mount_options(struct super_block
*sb
, char *options
);
2712 extern void replace_mount_options(struct super_block
*sb
, char *options
);
2714 static inline ino_t
parent_ino(struct dentry
*dentry
)
2719 * Don't strictly need d_lock here? If the parent ino could change
2720 * then surely we'd have a deeper race in the caller?
2722 spin_lock(&dentry
->d_lock
);
2723 res
= dentry
->d_parent
->d_inode
->i_ino
;
2724 spin_unlock(&dentry
->d_lock
);
2728 /* Transaction based IO helpers */
2731 * An argresp is stored in an allocated page and holds the
2732 * size of the argument or response, along with its content
2734 struct simple_transaction_argresp
{
2739 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2741 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
2743 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
2744 size_t size
, loff_t
*pos
);
2745 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
2747 void simple_transaction_set(struct file
*file
, size_t n
);
2750 * simple attribute files
2752 * These attributes behave similar to those in sysfs:
2754 * Writing to an attribute immediately sets a value, an open file can be
2755 * written to multiple times.
2757 * Reading from an attribute creates a buffer from the value that might get
2758 * read with multiple read calls. When the attribute has been read
2759 * completely, no further read calls are possible until the file is opened
2762 * All attributes contain a text representation of a numeric value
2763 * that are accessed with the get() and set() functions.
2765 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2766 static int __fops ## _open(struct inode *inode, struct file *file) \
2768 __simple_attr_check_format(__fmt, 0ull); \
2769 return simple_attr_open(inode, file, __get, __set, __fmt); \
2771 static const struct file_operations __fops = { \
2772 .owner = THIS_MODULE, \
2773 .open = __fops ## _open, \
2774 .release = simple_attr_release, \
2775 .read = simple_attr_read, \
2776 .write = simple_attr_write, \
2777 .llseek = generic_file_llseek, \
2780 static inline __printf(1, 2)
2781 void __simple_attr_check_format(const char *fmt
, ...)
2783 /* don't do anything, just let the compiler check the arguments; */
2786 int simple_attr_open(struct inode
*inode
, struct file
*file
,
2787 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
2789 int simple_attr_release(struct inode
*inode
, struct file
*file
);
2790 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
2791 size_t len
, loff_t
*ppos
);
2792 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
2793 size_t len
, loff_t
*ppos
);
2796 int proc_nr_files(struct ctl_table
*table
, int write
,
2797 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2798 int proc_nr_dentry(struct ctl_table
*table
, int write
,
2799 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2800 int proc_nr_inodes(struct ctl_table
*table
, int write
,
2801 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
2802 int __init
get_filesystem_list(char *buf
);
2804 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2805 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2807 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2808 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2809 (flag & __FMODE_NONOTIFY)))
2811 static inline int is_sxid(umode_t mode
)
2813 return (mode
& S_ISUID
) || ((mode
& S_ISGID
) && (mode
& S_IXGRP
));
2816 static inline int check_sticky(struct inode
*dir
, struct inode
*inode
)
2818 if (!(dir
->i_mode
& S_ISVTX
))
2821 return __check_sticky(dir
, inode
);
2824 static inline void inode_has_no_xattr(struct inode
*inode
)
2826 if (!is_sxid(inode
->i_mode
) && (inode
->i_sb
->s_flags
& MS_NOSEC
))
2827 inode
->i_flags
|= S_NOSEC
;
2830 static inline bool is_root_inode(struct inode
*inode
)
2832 return inode
== inode
->i_sb
->s_root
->d_inode
;
2835 static inline bool dir_emit(struct dir_context
*ctx
,
2836 const char *name
, int namelen
,
2837 u64 ino
, unsigned type
)
2839 return ctx
->actor(ctx
, name
, namelen
, ctx
->pos
, ino
, type
) == 0;
2841 static inline bool dir_emit_dot(struct file
*file
, struct dir_context
*ctx
)
2843 return ctx
->actor(ctx
, ".", 1, ctx
->pos
,
2844 file
->f_path
.dentry
->d_inode
->i_ino
, DT_DIR
) == 0;
2846 static inline bool dir_emit_dotdot(struct file
*file
, struct dir_context
*ctx
)
2848 return ctx
->actor(ctx
, "..", 2, ctx
->pos
,
2849 parent_ino(file
->f_path
.dentry
), DT_DIR
) == 0;
2851 static inline bool dir_emit_dots(struct file
*file
, struct dir_context
*ctx
)
2853 if (ctx
->pos
== 0) {
2854 if (!dir_emit_dot(file
, ctx
))
2858 if (ctx
->pos
== 1) {
2859 if (!dir_emit_dotdot(file
, ctx
))
2865 static inline bool dir_relax(struct inode
*inode
)
2867 mutex_unlock(&inode
->i_mutex
);
2868 mutex_lock(&inode
->i_mutex
);
2869 return !IS_DEADDIR(inode
);
2872 #endif /* _LINUX_FS_H */