1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/linkage.h>
6 #include <linux/wait_bit.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/xarray.h>
17 #include <linux/rbtree.h>
18 #include <linux/init.h>
19 #include <linux/pid.h>
20 #include <linux/bug.h>
21 #include <linux/mutex.h>
22 #include <linux/rwsem.h>
23 #include <linux/mm_types.h>
24 #include <linux/capability.h>
25 #include <linux/semaphore.h>
26 #include <linux/fcntl.h>
27 #include <linux/fiemap.h>
28 #include <linux/rculist_bl.h>
29 #include <linux/atomic.h>
30 #include <linux/shrinker.h>
31 #include <linux/migrate_mode.h>
32 #include <linux/uidgid.h>
33 #include <linux/lockdep.h>
34 #include <linux/percpu-rwsem.h>
35 #include <linux/workqueue.h>
36 #include <linux/delayed_call.h>
37 #include <linux/uuid.h>
38 #include <linux/errseq.h>
39 #include <linux/ioprio.h>
41 #include <asm/byteorder.h>
42 #include <uapi/linux/fs.h>
44 struct backing_dev_info
;
47 struct export_operations
;
52 struct pipe_inode_info
;
53 struct poll_table_struct
;
55 struct vm_area_struct
;
58 struct swap_info_struct
;
60 struct workqueue_struct
;
63 struct fscrypt_operations
;
65 extern void __init
inode_init(void);
66 extern void __init
inode_init_early(void);
67 extern void __init
files_init(void);
68 extern void __init
files_maxfiles_init(void);
70 extern struct files_stat_struct files_stat
;
71 extern unsigned long get_max_files(void);
72 extern unsigned int sysctl_nr_open
;
73 extern struct inodes_stat_t inodes_stat
;
74 extern int leases_enable
, lease_break_time
;
75 extern int sysctl_protected_symlinks
;
76 extern int sysctl_protected_hardlinks
;
77 extern int sysctl_protected_fifos
;
78 extern int sysctl_protected_regular
;
80 typedef __kernel_rwf_t rwf_t
;
83 typedef int (get_block_t
)(struct inode
*inode
, sector_t iblock
,
84 struct buffer_head
*bh_result
, int create
);
85 typedef int (dio_iodone_t
)(struct kiocb
*iocb
, loff_t offset
,
86 ssize_t bytes
, void *private);
88 #define MAY_EXEC 0x00000001
89 #define MAY_WRITE 0x00000002
90 #define MAY_READ 0x00000004
91 #define MAY_APPEND 0x00000008
92 #define MAY_ACCESS 0x00000010
93 #define MAY_OPEN 0x00000020
94 #define MAY_CHDIR 0x00000040
95 /* called from RCU mode, don't block */
96 #define MAY_NOT_BLOCK 0x00000080
99 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
100 * to O_WRONLY and O_RDWR via the strange trick in do_dentry_open()
103 /* file is open for reading */
104 #define FMODE_READ ((__force fmode_t)0x1)
105 /* file is open for writing */
106 #define FMODE_WRITE ((__force fmode_t)0x2)
107 /* file is seekable */
108 #define FMODE_LSEEK ((__force fmode_t)0x4)
109 /* file can be accessed using pread */
110 #define FMODE_PREAD ((__force fmode_t)0x8)
111 /* file can be accessed using pwrite */
112 #define FMODE_PWRITE ((__force fmode_t)0x10)
113 /* File is opened for execution with sys_execve / sys_uselib */
114 #define FMODE_EXEC ((__force fmode_t)0x20)
115 /* File is opened with O_NDELAY (only set for block devices) */
116 #define FMODE_NDELAY ((__force fmode_t)0x40)
117 /* File is opened with O_EXCL (only set for block devices) */
118 #define FMODE_EXCL ((__force fmode_t)0x80)
119 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
120 (specialy hack for floppy.c) */
121 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
122 /* 32bit hashes as llseek() offset (for directories) */
123 #define FMODE_32BITHASH ((__force fmode_t)0x200)
124 /* 64bit hashes as llseek() offset (for directories) */
125 #define FMODE_64BITHASH ((__force fmode_t)0x400)
128 * Don't update ctime and mtime.
130 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
131 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
133 #define FMODE_NOCMTIME ((__force fmode_t)0x800)
135 /* Expect random access pattern */
136 #define FMODE_RANDOM ((__force fmode_t)0x1000)
138 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
139 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
141 /* File is opened with O_PATH; almost nothing can be done with it */
142 #define FMODE_PATH ((__force fmode_t)0x4000)
144 /* File needs atomic accesses to f_pos */
145 #define FMODE_ATOMIC_POS ((__force fmode_t)0x8000)
146 /* Write access to underlying fs */
147 #define FMODE_WRITER ((__force fmode_t)0x10000)
148 /* Has read method(s) */
149 #define FMODE_CAN_READ ((__force fmode_t)0x20000)
150 /* Has write method(s) */
151 #define FMODE_CAN_WRITE ((__force fmode_t)0x40000)
153 #define FMODE_OPENED ((__force fmode_t)0x80000)
154 #define FMODE_CREATED ((__force fmode_t)0x100000)
156 /* File was opened by fanotify and shouldn't generate fanotify events */
157 #define FMODE_NONOTIFY ((__force fmode_t)0x4000000)
159 /* File is capable of returning -EAGAIN if I/O will block */
160 #define FMODE_NOWAIT ((__force fmode_t)0x8000000)
162 /* File does not contribute to nr_files count */
163 #define FMODE_NOACCOUNT ((__force fmode_t)0x20000000)
166 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
167 * that indicates that they should check the contents of the iovec are
168 * valid, but not check the memory that the iovec elements
171 #define CHECK_IOVEC_ONLY -1
174 * Attribute flags. These should be or-ed together to figure out what
177 #define ATTR_MODE (1 << 0)
178 #define ATTR_UID (1 << 1)
179 #define ATTR_GID (1 << 2)
180 #define ATTR_SIZE (1 << 3)
181 #define ATTR_ATIME (1 << 4)
182 #define ATTR_MTIME (1 << 5)
183 #define ATTR_CTIME (1 << 6)
184 #define ATTR_ATIME_SET (1 << 7)
185 #define ATTR_MTIME_SET (1 << 8)
186 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
187 #define ATTR_KILL_SUID (1 << 11)
188 #define ATTR_KILL_SGID (1 << 12)
189 #define ATTR_FILE (1 << 13)
190 #define ATTR_KILL_PRIV (1 << 14)
191 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
192 #define ATTR_TIMES_SET (1 << 16)
193 #define ATTR_TOUCH (1 << 17)
196 * Whiteout is represented by a char device. The following constants define the
197 * mode and device number to use.
199 #define WHITEOUT_MODE 0
200 #define WHITEOUT_DEV 0
203 * This is the Inode Attributes structure, used for notify_change(). It
204 * uses the above definitions as flags, to know which values have changed.
205 * Also, in this manner, a Filesystem can look at only the values it cares
206 * about. Basically, these are the attributes that the VFS layer can
207 * request to change from the FS layer.
209 * Derek Atkins <warlord@MIT.EDU> 94-10-20
212 unsigned int ia_valid
;
217 struct timespec64 ia_atime
;
218 struct timespec64 ia_mtime
;
219 struct timespec64 ia_ctime
;
222 * Not an attribute, but an auxiliary info for filesystems wanting to
223 * implement an ftruncate() like method. NOTE: filesystem should
224 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
226 struct file
*ia_file
;
230 * Includes for diskquotas.
232 #include <linux/quota.h>
235 * Maximum number of layers of fs stack. Needs to be limited to
236 * prevent kernel stack overflow
238 #define FILESYSTEM_MAX_STACK_DEPTH 2
241 * enum positive_aop_returns - aop return codes with specific semantics
243 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
244 * completed, that the page is still locked, and
245 * should be considered active. The VM uses this hint
246 * to return the page to the active list -- it won't
247 * be a candidate for writeback again in the near
248 * future. Other callers must be careful to unlock
249 * the page if they get this return. Returned by
252 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
253 * unlocked it and the page might have been truncated.
254 * The caller should back up to acquiring a new page and
255 * trying again. The aop will be taking reasonable
256 * precautions not to livelock. If the caller held a page
257 * reference, it should drop it before retrying. Returned
260 * address_space_operation functions return these large constants to indicate
261 * special semantics to the caller. These are much larger than the bytes in a
262 * page to allow for functions that return the number of bytes operated on in a
266 enum positive_aop_returns
{
267 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
268 AOP_TRUNCATED_PAGE
= 0x80001,
271 #define AOP_FLAG_CONT_EXPAND 0x0001 /* called from cont_expand */
272 #define AOP_FLAG_NOFS 0x0002 /* used by filesystem to direct
273 * helper code (eg buffer layer)
274 * to clear GFP_FS from alloc */
277 * oh the beauties of C type declarations.
280 struct address_space
;
281 struct writeback_control
;
284 * Write life time hint values.
285 * Stored in struct inode as u8.
288 WRITE_LIFE_NOT_SET
= 0,
289 WRITE_LIFE_NONE
= RWH_WRITE_LIFE_NONE
,
290 WRITE_LIFE_SHORT
= RWH_WRITE_LIFE_SHORT
,
291 WRITE_LIFE_MEDIUM
= RWH_WRITE_LIFE_MEDIUM
,
292 WRITE_LIFE_LONG
= RWH_WRITE_LIFE_LONG
,
293 WRITE_LIFE_EXTREME
= RWH_WRITE_LIFE_EXTREME
,
296 #define IOCB_EVENTFD (1 << 0)
297 #define IOCB_APPEND (1 << 1)
298 #define IOCB_DIRECT (1 << 2)
299 #define IOCB_HIPRI (1 << 3)
300 #define IOCB_DSYNC (1 << 4)
301 #define IOCB_SYNC (1 << 5)
302 #define IOCB_WRITE (1 << 6)
303 #define IOCB_NOWAIT (1 << 7)
306 struct file
*ki_filp
;
308 void (*ki_complete
)(struct kiocb
*iocb
, long ret
, long ret2
);
312 u16 ki_ioprio
; /* See linux/ioprio.h */
313 } __randomize_layout
;
315 static inline bool is_sync_kiocb(struct kiocb
*kiocb
)
317 return kiocb
->ki_complete
== NULL
;
321 * "descriptor" for what we're up to with a read.
322 * This allows us to use the same read code yet
323 * have multiple different users of the data that
324 * we read from a file.
326 * The simplest case just copies the data to user
339 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
340 unsigned long, unsigned long);
342 struct address_space_operations
{
343 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
344 int (*readpage
)(struct file
*, struct page
*);
346 /* Write back some dirty pages from this mapping. */
347 int (*writepages
)(struct address_space
*, struct writeback_control
*);
349 /* Set a page dirty. Return true if this dirtied it */
350 int (*set_page_dirty
)(struct page
*page
);
353 * Reads in the requested pages. Unlike ->readpage(), this is
354 * PURELY used for read-ahead!.
356 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
357 struct list_head
*pages
, unsigned nr_pages
);
359 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
360 loff_t pos
, unsigned len
, unsigned flags
,
361 struct page
**pagep
, void **fsdata
);
362 int (*write_end
)(struct file
*, struct address_space
*mapping
,
363 loff_t pos
, unsigned len
, unsigned copied
,
364 struct page
*page
, void *fsdata
);
366 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
367 sector_t (*bmap
)(struct address_space
*, sector_t
);
368 void (*invalidatepage
) (struct page
*, unsigned int, unsigned int);
369 int (*releasepage
) (struct page
*, gfp_t
);
370 void (*freepage
)(struct page
*);
371 ssize_t (*direct_IO
)(struct kiocb
*, struct iov_iter
*iter
);
373 * migrate the contents of a page to the specified target. If
374 * migrate_mode is MIGRATE_ASYNC, it must not block.
376 int (*migratepage
) (struct address_space
*,
377 struct page
*, struct page
*, enum migrate_mode
);
378 bool (*isolate_page
)(struct page
*, isolate_mode_t
);
379 void (*putback_page
)(struct page
*);
380 int (*launder_page
) (struct page
*);
381 int (*is_partially_uptodate
) (struct page
*, unsigned long,
383 void (*is_dirty_writeback
) (struct page
*, bool *, bool *);
384 int (*error_remove_page
)(struct address_space
*, struct page
*);
386 /* swapfile support */
387 int (*swap_activate
)(struct swap_info_struct
*sis
, struct file
*file
,
389 void (*swap_deactivate
)(struct file
*file
);
392 extern const struct address_space_operations empty_aops
;
395 * pagecache_write_begin/pagecache_write_end must be used by general code
396 * to write into the pagecache.
398 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
399 loff_t pos
, unsigned len
, unsigned flags
,
400 struct page
**pagep
, void **fsdata
);
402 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
403 loff_t pos
, unsigned len
, unsigned copied
,
404 struct page
*page
, void *fsdata
);
406 struct address_space
{
407 struct inode
*host
; /* owner: inode, block_device */
408 struct radix_tree_root i_pages
; /* cached pages */
409 atomic_t i_mmap_writable
;/* count VM_SHARED mappings */
410 struct rb_root_cached i_mmap
; /* tree of private and shared mappings */
411 struct rw_semaphore i_mmap_rwsem
; /* protect tree, count, list */
412 /* Protected by the i_pages lock */
413 unsigned long nrpages
; /* number of total pages */
414 /* number of shadow or DAX exceptional entries */
415 unsigned long nrexceptional
;
416 pgoff_t writeback_index
;/* writeback starts here */
417 const struct address_space_operations
*a_ops
; /* methods */
418 unsigned long flags
; /* error bits */
419 spinlock_t private_lock
; /* for use by the address_space */
420 gfp_t gfp_mask
; /* implicit gfp mask for allocations */
421 struct list_head private_list
; /* for use by the address_space */
422 void *private_data
; /* ditto */
424 } __attribute__((aligned(sizeof(long)))) __randomize_layout
;
426 * On most architectures that alignment is already the case; but
427 * must be enforced here for CRIS, to let the least significant bit
428 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
430 struct request_queue
;
432 struct block_device
{
433 dev_t bd_dev
; /* not a kdev_t - it's a search key */
435 struct inode
* bd_inode
; /* will die */
436 struct super_block
* bd_super
;
437 struct mutex bd_mutex
; /* open/close mutex */
441 bool bd_write_holder
;
443 struct list_head bd_holder_disks
;
445 struct block_device
* bd_contains
;
446 unsigned bd_block_size
;
448 struct hd_struct
* bd_part
;
449 /* number of times partitions within this device have been opened. */
450 unsigned bd_part_count
;
452 struct gendisk
* bd_disk
;
453 struct request_queue
* bd_queue
;
454 struct backing_dev_info
*bd_bdi
;
455 struct list_head bd_list
;
457 * Private data. You must have bd_claim'ed the block_device
458 * to use this. NOTE: bd_claim allows an owner to claim
459 * the same device multiple times, the owner must take special
460 * care to not mess up bd_private for that case.
462 unsigned long bd_private
;
464 /* The counter of freeze processes */
465 int bd_fsfreeze_count
;
466 /* Mutex for freeze */
467 struct mutex bd_fsfreeze_mutex
;
468 } __randomize_layout
;
471 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
474 #define PAGECACHE_TAG_DIRTY 0
475 #define PAGECACHE_TAG_WRITEBACK 1
476 #define PAGECACHE_TAG_TOWRITE 2
478 int mapping_tagged(struct address_space
*mapping
, int tag
);
480 static inline void i_mmap_lock_write(struct address_space
*mapping
)
482 down_write(&mapping
->i_mmap_rwsem
);
485 static inline void i_mmap_unlock_write(struct address_space
*mapping
)
487 up_write(&mapping
->i_mmap_rwsem
);
490 static inline void i_mmap_lock_read(struct address_space
*mapping
)
492 down_read(&mapping
->i_mmap_rwsem
);
495 static inline void i_mmap_unlock_read(struct address_space
*mapping
)
497 up_read(&mapping
->i_mmap_rwsem
);
501 * Might pages of this file be mapped into userspace?
503 static inline int mapping_mapped(struct address_space
*mapping
)
505 return !RB_EMPTY_ROOT(&mapping
->i_mmap
.rb_root
);
509 * Might pages of this file have been modified in userspace?
510 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
511 * marks vma as VM_SHARED if it is shared, and the file was opened for
512 * writing i.e. vma may be mprotected writable even if now readonly.
514 * If i_mmap_writable is negative, no new writable mappings are allowed. You
515 * can only deny writable mappings, if none exists right now.
517 static inline int mapping_writably_mapped(struct address_space
*mapping
)
519 return atomic_read(&mapping
->i_mmap_writable
) > 0;
522 static inline int mapping_map_writable(struct address_space
*mapping
)
524 return atomic_inc_unless_negative(&mapping
->i_mmap_writable
) ?
528 static inline void mapping_unmap_writable(struct address_space
*mapping
)
530 atomic_dec(&mapping
->i_mmap_writable
);
533 static inline int mapping_deny_writable(struct address_space
*mapping
)
535 return atomic_dec_unless_positive(&mapping
->i_mmap_writable
) ?
539 static inline void mapping_allow_writable(struct address_space
*mapping
)
541 atomic_inc(&mapping
->i_mmap_writable
);
545 * Use sequence counter to get consistent i_size on 32-bit processors.
547 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
548 #include <linux/seqlock.h>
549 #define __NEED_I_SIZE_ORDERED
550 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
552 #define i_size_ordered_init(inode) do { } while (0)
556 #define ACL_NOT_CACHED ((void *)(-1))
557 #define ACL_DONT_CACHE ((void *)(-3))
559 static inline struct posix_acl
*
560 uncached_acl_sentinel(struct task_struct
*task
)
562 return (void *)task
+ 1;
566 is_uncached_acl(struct posix_acl
*acl
)
568 return (long)acl
& 1;
571 #define IOP_FASTPERM 0x0001
572 #define IOP_LOOKUP 0x0002
573 #define IOP_NOFOLLOW 0x0004
574 #define IOP_XATTR 0x0008
575 #define IOP_DEFAULT_READLINK 0x0010
577 struct fsnotify_mark_connector
;
580 * Keep mostly read-only and often accessed (especially for
581 * the RCU path lookup and 'stat' data) fields at the beginning
582 * of the 'struct inode'
586 unsigned short i_opflags
;
589 unsigned int i_flags
;
591 #ifdef CONFIG_FS_POSIX_ACL
592 struct posix_acl
*i_acl
;
593 struct posix_acl
*i_default_acl
;
596 const struct inode_operations
*i_op
;
597 struct super_block
*i_sb
;
598 struct address_space
*i_mapping
;
600 #ifdef CONFIG_SECURITY
604 /* Stat data, not accessed from path walking */
607 * Filesystems may only read i_nlink directly. They shall use the
608 * following functions for modification:
610 * (set|clear|inc|drop)_nlink
611 * inode_(inc|dec)_link_count
614 const unsigned int i_nlink
;
615 unsigned int __i_nlink
;
619 struct timespec64 i_atime
;
620 struct timespec64 i_mtime
;
621 struct timespec64 i_ctime
;
622 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
623 unsigned short i_bytes
;
628 #ifdef __NEED_I_SIZE_ORDERED
629 seqcount_t i_size_seqcount
;
633 unsigned long i_state
;
634 struct rw_semaphore i_rwsem
;
636 unsigned long dirtied_when
; /* jiffies of first dirtying */
637 unsigned long dirtied_time_when
;
639 struct hlist_node i_hash
;
640 struct list_head i_io_list
; /* backing dev IO list */
641 #ifdef CONFIG_CGROUP_WRITEBACK
642 struct bdi_writeback
*i_wb
; /* the associated cgroup wb */
644 /* foreign inode detection, see wbc_detach_inode() */
646 u16 i_wb_frn_avg_time
;
647 u16 i_wb_frn_history
;
649 struct list_head i_lru
; /* inode LRU list */
650 struct list_head i_sb_list
;
651 struct list_head i_wb_list
; /* backing dev writeback list */
653 struct hlist_head i_dentry
;
654 struct rcu_head i_rcu
;
656 atomic64_t i_version
;
658 atomic_t i_dio_count
;
659 atomic_t i_writecount
;
661 atomic_t i_readcount
; /* struct files open RO */
663 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
664 struct file_lock_context
*i_flctx
;
665 struct address_space i_data
;
666 struct list_head i_devices
;
668 struct pipe_inode_info
*i_pipe
;
669 struct block_device
*i_bdev
;
677 #ifdef CONFIG_FSNOTIFY
678 __u32 i_fsnotify_mask
; /* all events this inode cares about */
679 struct fsnotify_mark_connector __rcu
*i_fsnotify_marks
;
682 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
683 struct fscrypt_info
*i_crypt_info
;
686 void *i_private
; /* fs or device private pointer */
687 } __randomize_layout
;
689 static inline unsigned int i_blocksize(const struct inode
*node
)
691 return (1 << node
->i_blkbits
);
694 static inline int inode_unhashed(struct inode
*inode
)
696 return hlist_unhashed(&inode
->i_hash
);
700 * __mark_inode_dirty expects inodes to be hashed. Since we don't
701 * want special inodes in the fileset inode space, we make them
702 * appear hashed, but do not put on any lists. hlist_del()
703 * will work fine and require no locking.
705 static inline void inode_fake_hash(struct inode
*inode
)
707 hlist_add_fake(&inode
->i_hash
);
711 * inode->i_mutex nesting subclasses for the lock validator:
713 * 0: the object of the current VFS operation
717 * 4: second non-directory
718 * 5: second parent (when locking independent directories in rename)
720 * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two
721 * non-directories at once.
723 * The locking order between these classes is
724 * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory
726 enum inode_i_mutex_lock_class
736 static inline void inode_lock(struct inode
*inode
)
738 down_write(&inode
->i_rwsem
);
741 static inline void inode_unlock(struct inode
*inode
)
743 up_write(&inode
->i_rwsem
);
746 static inline void inode_lock_shared(struct inode
*inode
)
748 down_read(&inode
->i_rwsem
);
751 static inline void inode_unlock_shared(struct inode
*inode
)
753 up_read(&inode
->i_rwsem
);
756 static inline int inode_trylock(struct inode
*inode
)
758 return down_write_trylock(&inode
->i_rwsem
);
761 static inline int inode_trylock_shared(struct inode
*inode
)
763 return down_read_trylock(&inode
->i_rwsem
);
766 static inline int inode_is_locked(struct inode
*inode
)
768 return rwsem_is_locked(&inode
->i_rwsem
);
771 static inline void inode_lock_nested(struct inode
*inode
, unsigned subclass
)
773 down_write_nested(&inode
->i_rwsem
, subclass
);
776 static inline void inode_lock_shared_nested(struct inode
*inode
, unsigned subclass
)
778 down_read_nested(&inode
->i_rwsem
, subclass
);
781 void lock_two_nondirectories(struct inode
*, struct inode
*);
782 void unlock_two_nondirectories(struct inode
*, struct inode
*);
785 * NOTE: in a 32bit arch with a preemptable kernel and
786 * an UP compile the i_size_read/write must be atomic
787 * with respect to the local cpu (unlike with preempt disabled),
788 * but they don't need to be atomic with respect to other cpus like in
789 * true SMP (so they need either to either locally disable irq around
790 * the read or for example on x86 they can be still implemented as a
791 * cmpxchg8b without the need of the lock prefix). For SMP compiles
792 * and 64bit archs it makes no difference if preempt is enabled or not.
794 static inline loff_t
i_size_read(const struct inode
*inode
)
796 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
801 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
802 i_size
= inode
->i_size
;
803 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
805 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
809 i_size
= inode
->i_size
;
813 return inode
->i_size
;
818 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
819 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
820 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
822 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
824 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
826 write_seqcount_begin(&inode
->i_size_seqcount
);
827 inode
->i_size
= i_size
;
828 write_seqcount_end(&inode
->i_size_seqcount
);
830 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
832 inode
->i_size
= i_size
;
835 inode
->i_size
= i_size
;
839 static inline unsigned iminor(const struct inode
*inode
)
841 return MINOR(inode
->i_rdev
);
844 static inline unsigned imajor(const struct inode
*inode
)
846 return MAJOR(inode
->i_rdev
);
849 extern struct block_device
*I_BDEV(struct inode
*inode
);
852 rwlock_t lock
; /* protects pid, uid, euid fields */
853 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
854 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
855 kuid_t uid
, euid
; /* uid/euid of process setting the owner */
856 int signum
; /* posix.1b rt signal to be delivered on IO */
860 * Track a single file's readahead state
862 struct file_ra_state
{
863 pgoff_t start
; /* where readahead started */
864 unsigned int size
; /* # of readahead pages */
865 unsigned int async_size
; /* do asynchronous readahead when
866 there are only # of pages ahead */
868 unsigned int ra_pages
; /* Maximum readahead window */
869 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
870 loff_t prev_pos
; /* Cache last read() position */
874 * Check if @index falls in the readahead windows.
876 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
878 return (index
>= ra
->start
&&
879 index
< ra
->start
+ ra
->size
);
884 struct llist_node fu_llist
;
885 struct rcu_head fu_rcuhead
;
888 struct inode
*f_inode
; /* cached value */
889 const struct file_operations
*f_op
;
892 * Protects f_ep_links, f_flags.
893 * Must not be taken from IRQ context.
896 enum rw_hint f_write_hint
;
897 atomic_long_t f_count
;
898 unsigned int f_flags
;
900 struct mutex f_pos_lock
;
902 struct fown_struct f_owner
;
903 const struct cred
*f_cred
;
904 struct file_ra_state f_ra
;
907 #ifdef CONFIG_SECURITY
910 /* needed for tty driver, and maybe others */
914 /* Used by fs/eventpoll.c to link all the hooks to this file */
915 struct list_head f_ep_links
;
916 struct list_head f_tfile_llink
;
917 #endif /* #ifdef CONFIG_EPOLL */
918 struct address_space
*f_mapping
;
921 __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */
926 /* file identifier */
927 unsigned char f_handle
[0];
930 static inline struct file
*get_file(struct file
*f
)
932 atomic_long_inc(&f
->f_count
);
935 #define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count)
936 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
937 #define file_count(x) atomic_long_read(&(x)->f_count)
939 #define MAX_NON_LFS ((1UL<<31) - 1)
941 /* Page cache limit. The filesystems should put that into their s_maxbytes
942 limits, otherwise bad things can happen in VM. */
943 #if BITS_PER_LONG==32
944 #define MAX_LFS_FILESIZE ((loff_t)ULONG_MAX << PAGE_SHIFT)
945 #elif BITS_PER_LONG==64
946 #define MAX_LFS_FILESIZE ((loff_t)LLONG_MAX)
951 #define FL_DELEG 4 /* NFSv4 delegation */
952 #define FL_ACCESS 8 /* not trying to lock, just looking */
953 #define FL_EXISTS 16 /* when unlocking, test for existence */
954 #define FL_LEASE 32 /* lease held on this file */
955 #define FL_CLOSE 64 /* unlock on close */
956 #define FL_SLEEP 128 /* A blocking lock */
957 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
958 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
959 #define FL_OFDLCK 1024 /* lock is "owned" by struct file */
960 #define FL_LAYOUT 2048 /* outstanding pNFS layout */
962 #define FL_CLOSE_POSIX (FL_POSIX | FL_CLOSE)
965 * Special return value from posix_lock_file() and vfs_lock_file() for
966 * asynchronous locking.
968 #define FILE_LOCK_DEFERRED 1
970 /* legacy typedef, should eventually be removed */
971 typedef void *fl_owner_t
;
975 struct file_lock_operations
{
976 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
977 void (*fl_release_private
)(struct file_lock
*);
980 struct lock_manager_operations
{
981 int (*lm_compare_owner
)(struct file_lock
*, struct file_lock
*);
982 unsigned long (*lm_owner_key
)(struct file_lock
*);
983 fl_owner_t (*lm_get_owner
)(fl_owner_t
);
984 void (*lm_put_owner
)(fl_owner_t
);
985 void (*lm_notify
)(struct file_lock
*); /* unblock callback */
986 int (*lm_grant
)(struct file_lock
*, int);
987 bool (*lm_break
)(struct file_lock
*);
988 int (*lm_change
)(struct file_lock
*, int, struct list_head
*);
989 void (*lm_setup
)(struct file_lock
*, void **);
992 struct lock_manager
{
993 struct list_head list
;
995 * NFSv4 and up also want opens blocked during the grace period;
1002 void locks_start_grace(struct net
*, struct lock_manager
*);
1003 void locks_end_grace(struct lock_manager
*);
1004 bool locks_in_grace(struct net
*);
1005 bool opens_in_grace(struct net
*);
1007 /* that will die - we need it for nfs_lock_info */
1008 #include <linux/nfs_fs_i.h>
1011 * struct file_lock represents a generic "file lock". It's used to represent
1012 * POSIX byte range locks, BSD (flock) locks, and leases. It's important to
1013 * note that the same struct is used to represent both a request for a lock and
1014 * the lock itself, but the same object is never used for both.
1016 * FIXME: should we create a separate "struct lock_request" to help distinguish
1019 * The varous i_flctx lists are ordered by:
1022 * 2) lock range start
1025 * Obviously, the last two criteria only matter for POSIX locks.
1028 struct file_lock
*fl_next
; /* singly linked list for this inode */
1029 struct list_head fl_list
; /* link into file_lock_context */
1030 struct hlist_node fl_link
; /* node in global lists */
1031 struct list_head fl_block
; /* circular list of blocked processes */
1032 fl_owner_t fl_owner
;
1033 unsigned int fl_flags
;
1034 unsigned char fl_type
;
1035 unsigned int fl_pid
;
1036 int fl_link_cpu
; /* what cpu's list is this on? */
1037 wait_queue_head_t fl_wait
;
1038 struct file
*fl_file
;
1042 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
1043 /* for lease breaks: */
1044 unsigned long fl_break_time
;
1045 unsigned long fl_downgrade_time
;
1047 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
1048 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
1050 struct nfs_lock_info nfs_fl
;
1051 struct nfs4_lock_info nfs4_fl
;
1053 struct list_head link
; /* link in AFS vnode's pending_locks list */
1054 int state
; /* state of grant or error if -ve */
1057 } __randomize_layout
;
1059 struct file_lock_context
{
1060 spinlock_t flc_lock
;
1061 struct list_head flc_flock
;
1062 struct list_head flc_posix
;
1063 struct list_head flc_lease
;
1066 /* The following constant reflects the upper bound of the file/locking space */
1068 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1069 #define OFFSET_MAX INT_LIMIT(loff_t)
1070 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1073 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
1075 #define locks_inode(f) file_inode(f)
1077 #ifdef CONFIG_FILE_LOCKING
1078 extern int fcntl_getlk(struct file
*, unsigned int, struct flock
*);
1079 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
1082 #if BITS_PER_LONG == 32
1083 extern int fcntl_getlk64(struct file
*, unsigned int, struct flock64
*);
1084 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
1088 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
1089 extern int fcntl_getlease(struct file
*filp
);
1092 void locks_free_lock_context(struct inode
*inode
);
1093 void locks_free_lock(struct file_lock
*fl
);
1094 extern void locks_init_lock(struct file_lock
*);
1095 extern struct file_lock
* locks_alloc_lock(void);
1096 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
1097 extern void locks_copy_conflock(struct file_lock
*, struct file_lock
*);
1098 extern void locks_remove_posix(struct file
*, fl_owner_t
);
1099 extern void locks_remove_file(struct file
*);
1100 extern void locks_release_private(struct file_lock
*);
1101 extern void posix_test_lock(struct file
*, struct file_lock
*);
1102 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
1103 extern int posix_unblock_lock(struct file_lock
*);
1104 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1105 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1106 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1107 extern int locks_lock_inode_wait(struct inode
*inode
, struct file_lock
*fl
);
1108 extern int __break_lease(struct inode
*inode
, unsigned int flags
, unsigned int type
);
1109 extern void lease_get_mtime(struct inode
*, struct timespec64
*time
);
1110 extern int generic_setlease(struct file
*, long, struct file_lock
**, void **priv
);
1111 extern int vfs_setlease(struct file
*, long, struct file_lock
**, void **);
1112 extern int lease_modify(struct file_lock
*, int, struct list_head
*);
1113 struct files_struct
;
1114 extern void show_fd_locks(struct seq_file
*f
,
1115 struct file
*filp
, struct files_struct
*files
);
1116 #else /* !CONFIG_FILE_LOCKING */
1117 static inline int fcntl_getlk(struct file
*file
, unsigned int cmd
,
1118 struct flock __user
*user
)
1123 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
1124 unsigned int cmd
, struct flock __user
*user
)
1129 #if BITS_PER_LONG == 32
1130 static inline int fcntl_getlk64(struct file
*file
, unsigned int cmd
,
1131 struct flock64 __user
*user
)
1136 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1137 unsigned int cmd
, struct flock64 __user
*user
)
1142 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1147 static inline int fcntl_getlease(struct file
*filp
)
1153 locks_free_lock_context(struct inode
*inode
)
1157 static inline void locks_init_lock(struct file_lock
*fl
)
1162 static inline void locks_copy_conflock(struct file_lock
*new, struct file_lock
*fl
)
1167 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1172 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1177 static inline void locks_remove_file(struct file
*filp
)
1182 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1187 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1188 struct file_lock
*conflock
)
1193 static inline int posix_unblock_lock(struct file_lock
*waiter
)
1198 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1203 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1204 struct file_lock
*fl
, struct file_lock
*conf
)
1209 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1214 static inline int locks_lock_inode_wait(struct inode
*inode
, struct file_lock
*fl
)
1219 static inline int __break_lease(struct inode
*inode
, unsigned int mode
, unsigned int type
)
1224 static inline void lease_get_mtime(struct inode
*inode
,
1225 struct timespec64
*time
)
1230 static inline int generic_setlease(struct file
*filp
, long arg
,
1231 struct file_lock
**flp
, void **priv
)
1236 static inline int vfs_setlease(struct file
*filp
, long arg
,
1237 struct file_lock
**lease
, void **priv
)
1242 static inline int lease_modify(struct file_lock
*fl
, int arg
,
1243 struct list_head
*dispose
)
1248 struct files_struct
;
1249 static inline void show_fd_locks(struct seq_file
*f
,
1250 struct file
*filp
, struct files_struct
*files
) {}
1251 #endif /* !CONFIG_FILE_LOCKING */
1253 static inline struct inode
*file_inode(const struct file
*f
)
1258 static inline struct dentry
*file_dentry(const struct file
*file
)
1260 return d_real(file
->f_path
.dentry
, file_inode(file
));
1263 static inline int locks_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1265 return locks_lock_inode_wait(locks_inode(filp
), fl
);
1268 struct fasync_struct
{
1272 struct fasync_struct
*fa_next
; /* singly linked list */
1273 struct file
*fa_file
;
1274 struct rcu_head fa_rcu
;
1277 #define FASYNC_MAGIC 0x4601
1279 /* SMP safe fasync helpers: */
1280 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1281 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1282 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1283 extern struct fasync_struct
*fasync_alloc(void);
1284 extern void fasync_free(struct fasync_struct
*);
1286 /* can be called from interrupts */
1287 extern void kill_fasync(struct fasync_struct
**, int, int);
1289 extern void __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1290 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1291 extern void f_delown(struct file
*filp
);
1292 extern pid_t
f_getown(struct file
*filp
);
1293 extern int send_sigurg(struct fown_struct
*fown
);
1296 * sb->s_flags. Note that these mirror the equivalent MS_* flags where
1297 * represented in both.
1299 #define SB_RDONLY 1 /* Mount read-only */
1300 #define SB_NOSUID 2 /* Ignore suid and sgid bits */
1301 #define SB_NODEV 4 /* Disallow access to device special files */
1302 #define SB_NOEXEC 8 /* Disallow program execution */
1303 #define SB_SYNCHRONOUS 16 /* Writes are synced at once */
1304 #define SB_MANDLOCK 64 /* Allow mandatory locks on an FS */
1305 #define SB_DIRSYNC 128 /* Directory modifications are synchronous */
1306 #define SB_NOATIME 1024 /* Do not update access times. */
1307 #define SB_NODIRATIME 2048 /* Do not update directory access times */
1308 #define SB_SILENT 32768
1309 #define SB_POSIXACL (1<<16) /* VFS does not apply the umask */
1310 #define SB_KERNMOUNT (1<<22) /* this is a kern_mount call */
1311 #define SB_I_VERSION (1<<23) /* Update inode I_version field */
1312 #define SB_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
1314 /* These sb flags are internal to the kernel */
1315 #define SB_SUBMOUNT (1<<26)
1316 #define SB_NOSEC (1<<28)
1317 #define SB_BORN (1<<29)
1318 #define SB_ACTIVE (1<<30)
1319 #define SB_NOUSER (1<<31)
1325 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1326 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1327 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1328 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1329 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1332 #define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */
1333 #define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */
1334 #define SB_I_NODEV 0x00000004 /* Ignore devices on this fs */
1335 #define SB_I_MULTIROOT 0x00000008 /* Multiple roots to the dentry tree */
1337 /* sb->s_iflags to limit user namespace mounts */
1338 #define SB_I_USERNS_VISIBLE 0x00000010 /* fstype already mounted */
1339 #define SB_I_IMA_UNVERIFIABLE_SIGNATURE 0x00000020
1340 #define SB_I_UNTRUSTED_MOUNTER 0x00000040
1342 /* Possible states of 'frozen' field */
1344 SB_UNFROZEN
= 0, /* FS is unfrozen */
1345 SB_FREEZE_WRITE
= 1, /* Writes, dir ops, ioctls frozen */
1346 SB_FREEZE_PAGEFAULT
= 2, /* Page faults stopped as well */
1347 SB_FREEZE_FS
= 3, /* For internal FS use (e.g. to stop
1348 * internal threads if needed) */
1349 SB_FREEZE_COMPLETE
= 4, /* ->freeze_fs finished successfully */
1352 #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
1355 int frozen
; /* Is sb frozen? */
1356 wait_queue_head_t wait_unfrozen
; /* for get_super_thawed() */
1357 struct percpu_rw_semaphore rw_sem
[SB_FREEZE_LEVELS
];
1360 struct super_block
{
1361 struct list_head s_list
; /* Keep this first */
1362 dev_t s_dev
; /* search index; _not_ kdev_t */
1363 unsigned char s_blocksize_bits
;
1364 unsigned long s_blocksize
;
1365 loff_t s_maxbytes
; /* Max file size */
1366 struct file_system_type
*s_type
;
1367 const struct super_operations
*s_op
;
1368 const struct dquot_operations
*dq_op
;
1369 const struct quotactl_ops
*s_qcop
;
1370 const struct export_operations
*s_export_op
;
1371 unsigned long s_flags
;
1372 unsigned long s_iflags
; /* internal SB_I_* flags */
1373 unsigned long s_magic
;
1374 struct dentry
*s_root
;
1375 struct rw_semaphore s_umount
;
1378 #ifdef CONFIG_SECURITY
1381 const struct xattr_handler
**s_xattr
;
1382 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
1383 const struct fscrypt_operations
*s_cop
;
1385 struct hlist_bl_head s_roots
; /* alternate root dentries for NFS */
1386 struct list_head s_mounts
; /* list of mounts; _not_ for fs use */
1387 struct block_device
*s_bdev
;
1388 struct backing_dev_info
*s_bdi
;
1389 struct mtd_info
*s_mtd
;
1390 struct hlist_node s_instances
;
1391 unsigned int s_quota_types
; /* Bitmask of supported quota types */
1392 struct quota_info s_dquot
; /* Diskquota specific options */
1394 struct sb_writers s_writers
;
1396 char s_id
[32]; /* Informational name */
1397 uuid_t s_uuid
; /* UUID */
1399 void *s_fs_info
; /* Filesystem private info */
1400 unsigned int s_max_links
;
1403 /* Granularity of c/m/atime in ns.
1404 Cannot be worse than a second */
1408 * The next field is for VFS *only*. No filesystems have any business
1409 * even looking at it. You had been warned.
1411 struct mutex s_vfs_rename_mutex
; /* Kludge */
1414 * Filesystem subtype. If non-empty the filesystem type field
1415 * in /proc/mounts will be "type.subtype"
1419 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1422 * Saved pool identifier for cleancache (-1 means none)
1424 int cleancache_poolid
;
1426 struct shrinker s_shrink
; /* per-sb shrinker handle */
1428 /* Number of inodes with nlink == 0 but still referenced */
1429 atomic_long_t s_remove_count
;
1431 /* Being remounted read-only */
1432 int s_readonly_remount
;
1434 /* AIO completions deferred from interrupt context */
1435 struct workqueue_struct
*s_dio_done_wq
;
1436 struct hlist_head s_pins
;
1439 * Owning user namespace and default context in which to
1440 * interpret filesystem uids, gids, quotas, device nodes,
1441 * xattrs and security labels.
1443 struct user_namespace
*s_user_ns
;
1446 * Keep the lru lists last in the structure so they always sit on their
1447 * own individual cachelines.
1449 struct list_lru s_dentry_lru ____cacheline_aligned_in_smp
;
1450 struct list_lru s_inode_lru ____cacheline_aligned_in_smp
;
1451 struct rcu_head rcu
;
1452 struct work_struct destroy_work
;
1454 struct mutex s_sync_lock
; /* sync serialisation lock */
1457 * Indicates how deep in a filesystem stack this SB is
1461 /* s_inode_list_lock protects s_inodes */
1462 spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp
;
1463 struct list_head s_inodes
; /* all inodes */
1465 spinlock_t s_inode_wblist_lock
;
1466 struct list_head s_inodes_wb
; /* writeback inodes */
1467 } __randomize_layout
;
1469 /* Helper functions so that in most cases filesystems will
1470 * not need to deal directly with kuid_t and kgid_t and can
1471 * instead deal with the raw numeric values that are stored
1472 * in the filesystem.
1474 static inline uid_t
i_uid_read(const struct inode
*inode
)
1476 return from_kuid(inode
->i_sb
->s_user_ns
, inode
->i_uid
);
1479 static inline gid_t
i_gid_read(const struct inode
*inode
)
1481 return from_kgid(inode
->i_sb
->s_user_ns
, inode
->i_gid
);
1484 static inline void i_uid_write(struct inode
*inode
, uid_t uid
)
1486 inode
->i_uid
= make_kuid(inode
->i_sb
->s_user_ns
, uid
);
1489 static inline void i_gid_write(struct inode
*inode
, gid_t gid
)
1491 inode
->i_gid
= make_kgid(inode
->i_sb
->s_user_ns
, gid
);
1494 extern struct timespec64
timespec64_trunc(struct timespec64 t
, unsigned gran
);
1495 extern struct timespec64
current_time(struct inode
*inode
);
1498 * Snapshotting support.
1501 void __sb_end_write(struct super_block
*sb
, int level
);
1502 int __sb_start_write(struct super_block
*sb
, int level
, bool wait
);
1504 #define __sb_writers_acquired(sb, lev) \
1505 percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
1506 #define __sb_writers_release(sb, lev) \
1507 percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
1510 * sb_end_write - drop write access to a superblock
1511 * @sb: the super we wrote to
1513 * Decrement number of writers to the filesystem. Wake up possible waiters
1514 * wanting to freeze the filesystem.
1516 static inline void sb_end_write(struct super_block
*sb
)
1518 __sb_end_write(sb
, SB_FREEZE_WRITE
);
1522 * sb_end_pagefault - drop write access to a superblock from a page fault
1523 * @sb: the super we wrote to
1525 * Decrement number of processes handling write page fault to the filesystem.
1526 * Wake up possible waiters wanting to freeze the filesystem.
1528 static inline void sb_end_pagefault(struct super_block
*sb
)
1530 __sb_end_write(sb
, SB_FREEZE_PAGEFAULT
);
1534 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
1535 * @sb: the super we wrote to
1537 * Decrement fs-internal number of writers to the filesystem. Wake up possible
1538 * waiters wanting to freeze the filesystem.
1540 static inline void sb_end_intwrite(struct super_block
*sb
)
1542 __sb_end_write(sb
, SB_FREEZE_FS
);
1546 * sb_start_write - get write access to a superblock
1547 * @sb: the super we write to
1549 * When a process wants to write data or metadata to a file system (i.e. dirty
1550 * a page or an inode), it should embed the operation in a sb_start_write() -
1551 * sb_end_write() pair to get exclusion against file system freezing. This
1552 * function increments number of writers preventing freezing. If the file
1553 * system is already frozen, the function waits until the file system is
1556 * Since freeze protection behaves as a lock, users have to preserve
1557 * ordering of freeze protection and other filesystem locks. Generally,
1558 * freeze protection should be the outermost lock. In particular, we have:
1561 * -> i_mutex (write path, truncate, directory ops, ...)
1562 * -> s_umount (freeze_super, thaw_super)
1564 static inline void sb_start_write(struct super_block
*sb
)
1566 __sb_start_write(sb
, SB_FREEZE_WRITE
, true);
1569 static inline int sb_start_write_trylock(struct super_block
*sb
)
1571 return __sb_start_write(sb
, SB_FREEZE_WRITE
, false);
1575 * sb_start_pagefault - get write access to a superblock from a page fault
1576 * @sb: the super we write to
1578 * When a process starts handling write page fault, it should embed the
1579 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
1580 * exclusion against file system freezing. This is needed since the page fault
1581 * is going to dirty a page. This function increments number of running page
1582 * faults preventing freezing. If the file system is already frozen, the
1583 * function waits until the file system is thawed.
1585 * Since page fault freeze protection behaves as a lock, users have to preserve
1586 * ordering of freeze protection and other filesystem locks. It is advised to
1587 * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
1588 * handling code implies lock dependency:
1591 * -> sb_start_pagefault
1593 static inline void sb_start_pagefault(struct super_block
*sb
)
1595 __sb_start_write(sb
, SB_FREEZE_PAGEFAULT
, true);
1599 * sb_start_intwrite - get write access to a superblock for internal fs purposes
1600 * @sb: the super we write to
1602 * This is the third level of protection against filesystem freezing. It is
1603 * free for use by a filesystem. The only requirement is that it must rank
1604 * below sb_start_pagefault.
1606 * For example filesystem can call sb_start_intwrite() when starting a
1607 * transaction which somewhat eases handling of freezing for internal sources
1608 * of filesystem changes (internal fs threads, discarding preallocation on file
1611 static inline void sb_start_intwrite(struct super_block
*sb
)
1613 __sb_start_write(sb
, SB_FREEZE_FS
, true);
1616 static inline int sb_start_intwrite_trylock(struct super_block
*sb
)
1618 return __sb_start_write(sb
, SB_FREEZE_FS
, false);
1622 extern bool inode_owner_or_capable(const struct inode
*inode
);
1625 * VFS helper functions..
1627 extern int vfs_create(struct inode
*, struct dentry
*, umode_t
, bool);
1628 extern int vfs_mkdir(struct inode
*, struct dentry
*, umode_t
);
1629 extern int vfs_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
1630 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1631 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*, struct inode
**);
1632 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1633 extern int vfs_unlink(struct inode
*, struct dentry
*, struct inode
**);
1634 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*, struct inode
**, unsigned int);
1635 extern int vfs_whiteout(struct inode
*, struct dentry
*);
1637 extern struct dentry
*vfs_tmpfile(struct dentry
*dentry
, umode_t mode
,
1640 int vfs_mkobj(struct dentry
*, umode_t
,
1641 int (*f
)(struct dentry
*, umode_t
, void *),
1644 extern long vfs_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
1647 * VFS file helper functions.
1649 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1651 extern bool may_open_dev(const struct path
*path
);
1653 * VFS FS_IOC_FIEMAP helper definitions.
1655 struct fiemap_extent_info
{
1656 unsigned int fi_flags
; /* Flags as passed from user */
1657 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1658 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1659 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1660 fiemap_extent array */
1662 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1663 u64 phys
, u64 len
, u32 flags
);
1664 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1669 * NOTE! These match bits 12..15 of stat.st_mode
1670 * (ie "(i_mode >> 12) & 15").
1672 #define DT_UNKNOWN 0
1683 * This is the "filldir" function type, used by readdir() to let
1684 * the kernel specify what kind of dirent layout it wants to have.
1685 * This allows the kernel to read directories into kernel space or
1686 * to have different dirent layouts depending on the binary type.
1689 typedef int (*filldir_t
)(struct dir_context
*, const char *, int, loff_t
, u64
,
1692 struct dir_context
{
1697 struct block_device_operations
;
1699 /* These macros are for out of kernel modules to test that
1700 * the kernel supports the unlocked_ioctl and compat_ioctl
1701 * fields in struct file_operations. */
1702 #define HAVE_COMPAT_IOCTL 1
1703 #define HAVE_UNLOCKED_IOCTL 1
1706 * These flags let !MMU mmap() govern direct device mapping vs immediate
1707 * copying more easily for MAP_PRIVATE, especially for ROM filesystems.
1709 * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE)
1710 * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED)
1711 * NOMMU_MAP_READ: Can be mapped for reading
1712 * NOMMU_MAP_WRITE: Can be mapped for writing
1713 * NOMMU_MAP_EXEC: Can be mapped for execution
1715 #define NOMMU_MAP_COPY 0x00000001
1716 #define NOMMU_MAP_DIRECT 0x00000008
1717 #define NOMMU_MAP_READ VM_MAYREAD
1718 #define NOMMU_MAP_WRITE VM_MAYWRITE
1719 #define NOMMU_MAP_EXEC VM_MAYEXEC
1721 #define NOMMU_VMFLAGS \
1722 (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC)
1725 * These flags control the behavior of the remap_file_range function pointer.
1726 * If it is called with len == 0 that means "remap to end of source file".
1727 * See Documentation/filesystems/vfs.txt for more details about this call.
1729 * REMAP_FILE_DEDUP: only remap if contents identical (i.e. deduplicate)
1731 #define REMAP_FILE_DEDUP (1 << 0)
1734 * These flags signal that the caller is ok with altering various aspects of
1735 * the behavior of the remap operation. The changes must be made by the
1736 * implementation; the vfs remap helper functions can take advantage of them.
1737 * Flags in this category exist to preserve the quirky behavior of the hoisted
1738 * btrfs clone/dedupe ioctls.
1739 * There are no flags yet, but subsequent commits will add some.
1741 #define REMAP_FILE_ADVISORY (0)
1745 struct file_operations
{
1746 struct module
*owner
;
1747 loff_t (*llseek
) (struct file
*, loff_t
, int);
1748 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1749 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1750 ssize_t (*read_iter
) (struct kiocb
*, struct iov_iter
*);
1751 ssize_t (*write_iter
) (struct kiocb
*, struct iov_iter
*);
1752 int (*iterate
) (struct file
*, struct dir_context
*);
1753 int (*iterate_shared
) (struct file
*, struct dir_context
*);
1754 __poll_t (*poll
) (struct file
*, struct poll_table_struct
*);
1755 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1756 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1757 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1758 unsigned long mmap_supported_flags
;
1759 int (*open
) (struct inode
*, struct file
*);
1760 int (*flush
) (struct file
*, fl_owner_t id
);
1761 int (*release
) (struct inode
*, struct file
*);
1762 int (*fsync
) (struct file
*, loff_t
, loff_t
, int datasync
);
1763 int (*fasync
) (int, struct file
*, int);
1764 int (*lock
) (struct file
*, int, struct file_lock
*);
1765 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1766 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1767 int (*check_flags
)(int);
1768 int (*flock
) (struct file
*, int, struct file_lock
*);
1769 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1770 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1771 int (*setlease
)(struct file
*, long, struct file_lock
**, void **);
1772 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1774 void (*show_fdinfo
)(struct seq_file
*m
, struct file
*f
);
1776 unsigned (*mmap_capabilities
)(struct file
*);
1778 ssize_t (*copy_file_range
)(struct file
*, loff_t
, struct file
*,
1779 loff_t
, size_t, unsigned int);
1780 int (*remap_file_range
)(struct file
*file_in
, loff_t pos_in
,
1781 struct file
*file_out
, loff_t pos_out
,
1782 u64 len
, unsigned int remap_flags
);
1783 int (*fadvise
)(struct file
*, loff_t
, loff_t
, int);
1784 } __randomize_layout
;
1786 struct inode_operations
{
1787 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, unsigned int);
1788 const char * (*get_link
) (struct dentry
*, struct inode
*, struct delayed_call
*);
1789 int (*permission
) (struct inode
*, int);
1790 struct posix_acl
* (*get_acl
)(struct inode
*, int);
1792 int (*readlink
) (struct dentry
*, char __user
*,int);
1794 int (*create
) (struct inode
*,struct dentry
*, umode_t
, bool);
1795 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1796 int (*unlink
) (struct inode
*,struct dentry
*);
1797 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1798 int (*mkdir
) (struct inode
*,struct dentry
*,umode_t
);
1799 int (*rmdir
) (struct inode
*,struct dentry
*);
1800 int (*mknod
) (struct inode
*,struct dentry
*,umode_t
,dev_t
);
1801 int (*rename
) (struct inode
*, struct dentry
*,
1802 struct inode
*, struct dentry
*, unsigned int);
1803 int (*setattr
) (struct dentry
*, struct iattr
*);
1804 int (*getattr
) (const struct path
*, struct kstat
*, u32
, unsigned int);
1805 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1806 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1808 int (*update_time
)(struct inode
*, struct timespec64
*, int);
1809 int (*atomic_open
)(struct inode
*, struct dentry
*,
1810 struct file
*, unsigned open_flag
,
1811 umode_t create_mode
);
1812 int (*tmpfile
) (struct inode
*, struct dentry
*, umode_t
);
1813 int (*set_acl
)(struct inode
*, struct posix_acl
*, int);
1814 } ____cacheline_aligned
;
1816 static inline ssize_t
call_read_iter(struct file
*file
, struct kiocb
*kio
,
1817 struct iov_iter
*iter
)
1819 return file
->f_op
->read_iter(kio
, iter
);
1822 static inline ssize_t
call_write_iter(struct file
*file
, struct kiocb
*kio
,
1823 struct iov_iter
*iter
)
1825 return file
->f_op
->write_iter(kio
, iter
);
1828 static inline int call_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1830 return file
->f_op
->mmap(file
, vma
);
1833 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1834 unsigned long nr_segs
, unsigned long fast_segs
,
1835 struct iovec
*fast_pointer
,
1836 struct iovec
**ret_pointer
);
1838 extern ssize_t
__vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1839 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1840 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1841 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1842 unsigned long, loff_t
*, rwf_t
);
1843 extern ssize_t
vfs_copy_file_range(struct file
*, loff_t
, struct file
*,
1844 loff_t
, size_t, unsigned int);
1845 extern int generic_remap_file_range_prep(struct file
*file_in
, loff_t pos_in
,
1846 struct file
*file_out
, loff_t pos_out
,
1847 u64
*count
, unsigned int remap_flags
);
1848 extern int do_clone_file_range(struct file
*file_in
, loff_t pos_in
,
1849 struct file
*file_out
, loff_t pos_out
, u64 len
);
1850 extern int vfs_clone_file_range(struct file
*file_in
, loff_t pos_in
,
1851 struct file
*file_out
, loff_t pos_out
, u64 len
);
1852 extern int vfs_dedupe_file_range_compare(struct inode
*src
, loff_t srcoff
,
1853 struct inode
*dest
, loff_t destoff
,
1854 loff_t len
, bool *is_same
);
1855 extern int vfs_dedupe_file_range(struct file
*file
,
1856 struct file_dedupe_range
*same
);
1857 extern int vfs_dedupe_file_range_one(struct file
*src_file
, loff_t src_pos
,
1858 struct file
*dst_file
, loff_t dst_pos
,
1862 struct super_operations
{
1863 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1864 void (*destroy_inode
)(struct inode
*);
1866 void (*dirty_inode
) (struct inode
*, int flags
);
1867 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1868 int (*drop_inode
) (struct inode
*);
1869 void (*evict_inode
) (struct inode
*);
1870 void (*put_super
) (struct super_block
*);
1871 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1872 int (*freeze_super
) (struct super_block
*);
1873 int (*freeze_fs
) (struct super_block
*);
1874 int (*thaw_super
) (struct super_block
*);
1875 int (*unfreeze_fs
) (struct super_block
*);
1876 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1877 int (*remount_fs
) (struct super_block
*, int *, char *);
1878 void (*umount_begin
) (struct super_block
*);
1880 int (*show_options
)(struct seq_file
*, struct dentry
*);
1881 int (*show_devname
)(struct seq_file
*, struct dentry
*);
1882 int (*show_path
)(struct seq_file
*, struct dentry
*);
1883 int (*show_stats
)(struct seq_file
*, struct dentry
*);
1885 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1886 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1887 struct dquot
**(*get_dquots
)(struct inode
*);
1889 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1890 long (*nr_cached_objects
)(struct super_block
*,
1891 struct shrink_control
*);
1892 long (*free_cached_objects
)(struct super_block
*,
1893 struct shrink_control
*);
1897 * Inode flags - they have no relation to superblock flags now
1899 #define S_SYNC 1 /* Writes are synced at once */
1900 #define S_NOATIME 2 /* Do not update access times */
1901 #define S_APPEND 4 /* Append-only file */
1902 #define S_IMMUTABLE 8 /* Immutable file */
1903 #define S_DEAD 16 /* removed, but still open directory */
1904 #define S_NOQUOTA 32 /* Inode is not counted to quota */
1905 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
1906 #define S_NOCMTIME 128 /* Do not update file c/mtime */
1907 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
1908 #define S_PRIVATE 512 /* Inode is fs-internal */
1909 #define S_IMA 1024 /* Inode has an associated IMA struct */
1910 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
1911 #define S_NOSEC 4096 /* no suid or xattr security attributes */
1912 #ifdef CONFIG_FS_DAX
1913 #define S_DAX 8192 /* Direct Access, avoiding the page cache */
1915 #define S_DAX 0 /* Make all the DAX code disappear */
1917 #define S_ENCRYPTED 16384 /* Encrypted file (using fs/crypto/) */
1920 * Note that nosuid etc flags are inode-specific: setting some file-system
1921 * flags just means all the inodes inherit those flags by default. It might be
1922 * possible to override it selectively if you really wanted to with some
1923 * ioctl() that is not currently implemented.
1925 * Exception: SB_RDONLY is always applied to the entire file system.
1927 * Unfortunately, it is possible to change a filesystems flags with it mounted
1928 * with files in use. This means that all of the inodes will not have their
1929 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
1930 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
1932 #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg))
1934 static inline bool sb_rdonly(const struct super_block
*sb
) { return sb
->s_flags
& SB_RDONLY
; }
1935 #define IS_RDONLY(inode) sb_rdonly((inode)->i_sb)
1936 #define IS_SYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS) || \
1937 ((inode)->i_flags & S_SYNC))
1938 #define IS_DIRSYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS|SB_DIRSYNC) || \
1939 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
1940 #define IS_MANDLOCK(inode) __IS_FLG(inode, SB_MANDLOCK)
1941 #define IS_NOATIME(inode) __IS_FLG(inode, SB_RDONLY|SB_NOATIME)
1942 #define IS_I_VERSION(inode) __IS_FLG(inode, SB_I_VERSION)
1944 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
1945 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
1946 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
1947 #define IS_POSIXACL(inode) __IS_FLG(inode, SB_POSIXACL)
1949 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
1950 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
1951 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
1952 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
1953 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
1954 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
1955 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
1956 #define IS_DAX(inode) ((inode)->i_flags & S_DAX)
1957 #define IS_ENCRYPTED(inode) ((inode)->i_flags & S_ENCRYPTED)
1959 #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \
1960 (inode)->i_rdev == WHITEOUT_DEV)
1962 static inline bool HAS_UNMAPPED_ID(struct inode
*inode
)
1964 return !uid_valid(inode
->i_uid
) || !gid_valid(inode
->i_gid
);
1967 static inline enum rw_hint
file_write_hint(struct file
*file
)
1969 if (file
->f_write_hint
!= WRITE_LIFE_NOT_SET
)
1970 return file
->f_write_hint
;
1972 return file_inode(file
)->i_write_hint
;
1975 static inline int iocb_flags(struct file
*file
);
1977 static inline u16
ki_hint_validate(enum rw_hint hint
)
1979 typeof(((struct kiocb
*)0)->ki_hint
) max_hint
= -1;
1981 if (hint
<= max_hint
)
1986 static inline void init_sync_kiocb(struct kiocb
*kiocb
, struct file
*filp
)
1988 *kiocb
= (struct kiocb
) {
1990 .ki_flags
= iocb_flags(filp
),
1991 .ki_hint
= ki_hint_validate(file_write_hint(filp
)),
1992 .ki_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE
, 0),
1997 * Inode state bits. Protected by inode->i_lock
1999 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
2000 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
2002 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
2003 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
2004 * various stages of removing an inode.
2006 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
2008 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
2009 * fdatasync(). i_atime is the usual cause.
2010 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
2011 * these changes separately from I_DIRTY_SYNC so that we
2012 * don't have to write inode on fdatasync() when only
2013 * mtime has changed in it.
2014 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
2015 * I_NEW Serves as both a mutex and completion notification.
2016 * New inodes set I_NEW. If two processes both create
2017 * the same inode, one of them will release its inode and
2018 * wait for I_NEW to be released before returning.
2019 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
2020 * also cause waiting on I_NEW, without I_NEW actually
2021 * being set. find_inode() uses this to prevent returning
2022 * nearly-dead inodes.
2023 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
2024 * is zero. I_FREEING must be set when I_WILL_FREE is
2026 * I_FREEING Set when inode is about to be freed but still has dirty
2027 * pages or buffers attached or the inode itself is still
2029 * I_CLEAR Added by clear_inode(). In this state the inode is
2030 * clean and can be destroyed. Inode keeps I_FREEING.
2032 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
2033 * prohibited for many purposes. iget() must wait for
2034 * the inode to be completely released, then create it
2035 * anew. Other functions will just ignore such inodes,
2036 * if appropriate. I_NEW is used for waiting.
2038 * I_SYNC Writeback of inode is running. The bit is set during
2039 * data writeback, and cleared with a wakeup on the bit
2040 * address once it is done. The bit is also used to pin
2041 * the inode in memory for flusher thread.
2043 * I_REFERENCED Marks the inode as recently references on the LRU list.
2045 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
2047 * I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to
2048 * synchronize competing switching instances and to tell
2049 * wb stat updates to grab the i_pages lock. See
2050 * inode_switch_wb_work_fn() for details.
2052 * I_OVL_INUSE Used by overlayfs to get exclusive ownership on upper
2053 * and work dirs among overlayfs mounts.
2055 * I_CREATING New object's inode in the middle of setting up.
2057 * Q: What is the difference between I_WILL_FREE and I_FREEING?
2059 #define I_DIRTY_SYNC (1 << 0)
2060 #define I_DIRTY_DATASYNC (1 << 1)
2061 #define I_DIRTY_PAGES (1 << 2)
2063 #define I_NEW (1 << __I_NEW)
2064 #define I_WILL_FREE (1 << 4)
2065 #define I_FREEING (1 << 5)
2066 #define I_CLEAR (1 << 6)
2068 #define I_SYNC (1 << __I_SYNC)
2069 #define I_REFERENCED (1 << 8)
2070 #define __I_DIO_WAKEUP 9
2071 #define I_DIO_WAKEUP (1 << __I_DIO_WAKEUP)
2072 #define I_LINKABLE (1 << 10)
2073 #define I_DIRTY_TIME (1 << 11)
2074 #define __I_DIRTY_TIME_EXPIRED 12
2075 #define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED)
2076 #define I_WB_SWITCH (1 << 13)
2077 #define I_OVL_INUSE (1 << 14)
2078 #define I_CREATING (1 << 15)
2080 #define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)
2081 #define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)
2082 #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME)
2084 extern void __mark_inode_dirty(struct inode
*, int);
2085 static inline void mark_inode_dirty(struct inode
*inode
)
2087 __mark_inode_dirty(inode
, I_DIRTY
);
2090 static inline void mark_inode_dirty_sync(struct inode
*inode
)
2092 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
2095 extern void inc_nlink(struct inode
*inode
);
2096 extern void drop_nlink(struct inode
*inode
);
2097 extern void clear_nlink(struct inode
*inode
);
2098 extern void set_nlink(struct inode
*inode
, unsigned int nlink
);
2100 static inline void inode_inc_link_count(struct inode
*inode
)
2103 mark_inode_dirty(inode
);
2106 static inline void inode_dec_link_count(struct inode
*inode
)
2109 mark_inode_dirty(inode
);
2112 enum file_time_flags
{
2119 extern bool atime_needs_update(const struct path
*, struct inode
*);
2120 extern void touch_atime(const struct path
*);
2121 static inline void file_accessed(struct file
*file
)
2123 if (!(file
->f_flags
& O_NOATIME
))
2124 touch_atime(&file
->f_path
);
2127 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
2128 int sync_inode_metadata(struct inode
*inode
, int wait
);
2130 struct file_system_type
{
2133 #define FS_REQUIRES_DEV 1
2134 #define FS_BINARY_MOUNTDATA 2
2135 #define FS_HAS_SUBTYPE 4
2136 #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */
2137 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */
2138 struct dentry
*(*mount
) (struct file_system_type
*, int,
2139 const char *, void *);
2140 void (*kill_sb
) (struct super_block
*);
2141 struct module
*owner
;
2142 struct file_system_type
* next
;
2143 struct hlist_head fs_supers
;
2145 struct lock_class_key s_lock_key
;
2146 struct lock_class_key s_umount_key
;
2147 struct lock_class_key s_vfs_rename_key
;
2148 struct lock_class_key s_writers_key
[SB_FREEZE_LEVELS
];
2150 struct lock_class_key i_lock_key
;
2151 struct lock_class_key i_mutex_key
;
2152 struct lock_class_key i_mutex_dir_key
;
2155 #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)
2157 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
,
2158 int flags
, void *data
, void *ns
, struct user_namespace
*user_ns
,
2159 int (*fill_super
)(struct super_block
*, void *, int));
2161 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
2162 int flags
, const char *dev_name
, void *data
,
2163 int (*fill_super
)(struct super_block
*, void *, int));
2165 static inline struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
2166 int flags
, const char *dev_name
, void *data
,
2167 int (*fill_super
)(struct super_block
*, void *, int))
2169 return ERR_PTR(-ENODEV
);
2172 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
2173 int flags
, void *data
,
2174 int (*fill_super
)(struct super_block
*, void *, int));
2175 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
2176 int flags
, void *data
,
2177 int (*fill_super
)(struct super_block
*, void *, int));
2178 extern struct dentry
*mount_subtree(struct vfsmount
*mnt
, const char *path
);
2179 void generic_shutdown_super(struct super_block
*sb
);
2181 void kill_block_super(struct super_block
*sb
);
2183 static inline void kill_block_super(struct super_block
*sb
)
2188 void kill_anon_super(struct super_block
*sb
);
2189 void kill_litter_super(struct super_block
*sb
);
2190 void deactivate_super(struct super_block
*sb
);
2191 void deactivate_locked_super(struct super_block
*sb
);
2192 int set_anon_super(struct super_block
*s
, void *data
);
2193 int get_anon_bdev(dev_t
*);
2194 void free_anon_bdev(dev_t
);
2195 struct super_block
*sget_userns(struct file_system_type
*type
,
2196 int (*test
)(struct super_block
*,void *),
2197 int (*set
)(struct super_block
*,void *),
2198 int flags
, struct user_namespace
*user_ns
,
2200 struct super_block
*sget(struct file_system_type
*type
,
2201 int (*test
)(struct super_block
*,void *),
2202 int (*set
)(struct super_block
*,void *),
2203 int flags
, void *data
);
2204 extern struct dentry
*mount_pseudo_xattr(struct file_system_type
*, char *,
2205 const struct super_operations
*ops
,
2206 const struct xattr_handler
**xattr
,
2207 const struct dentry_operations
*dops
,
2210 static inline struct dentry
*
2211 mount_pseudo(struct file_system_type
*fs_type
, char *name
,
2212 const struct super_operations
*ops
,
2213 const struct dentry_operations
*dops
, unsigned long magic
)
2215 return mount_pseudo_xattr(fs_type
, name
, ops
, NULL
, dops
, magic
);
2218 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
2219 #define fops_get(fops) \
2220 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
2221 #define fops_put(fops) \
2222 do { if (fops) module_put((fops)->owner); } while(0)
2224 * This one is to be used *ONLY* from ->open() instances.
2225 * fops must be non-NULL, pinned down *and* module dependencies
2226 * should be sufficient to pin the caller down as well.
2228 #define replace_fops(f, fops) \
2230 struct file *__file = (f); \
2231 fops_put(__file->f_op); \
2232 BUG_ON(!(__file->f_op = (fops))); \
2235 extern int register_filesystem(struct file_system_type
*);
2236 extern int unregister_filesystem(struct file_system_type
*);
2237 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
2238 #define kern_mount(type) kern_mount_data(type, NULL)
2239 extern void kern_unmount(struct vfsmount
*mnt
);
2240 extern int may_umount_tree(struct vfsmount
*);
2241 extern int may_umount(struct vfsmount
*);
2242 extern long do_mount(const char *, const char __user
*,
2243 const char *, unsigned long, void *);
2244 extern struct vfsmount
*collect_mounts(const struct path
*);
2245 extern void drop_collected_mounts(struct vfsmount
*);
2246 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
2248 extern int vfs_statfs(const struct path
*, struct kstatfs
*);
2249 extern int user_statfs(const char __user
*, struct kstatfs
*);
2250 extern int fd_statfs(int, struct kstatfs
*);
2251 extern int freeze_super(struct super_block
*super
);
2252 extern int thaw_super(struct super_block
*super
);
2253 extern bool our_mnt(struct vfsmount
*mnt
);
2254 extern __printf(2, 3)
2255 int super_setup_bdi_name(struct super_block
*sb
, char *fmt
, ...);
2256 extern int super_setup_bdi(struct super_block
*sb
);
2258 extern int current_umask(void);
2260 extern void ihold(struct inode
* inode
);
2261 extern void iput(struct inode
*);
2262 extern int generic_update_time(struct inode
*, struct timespec64
*, int);
2265 extern struct kobject
*fs_kobj
;
2267 #define MAX_RW_COUNT (INT_MAX & PAGE_MASK)
2269 #ifdef CONFIG_MANDATORY_FILE_LOCKING
2270 extern int locks_mandatory_locked(struct file
*);
2271 extern int locks_mandatory_area(struct inode
*, struct file
*, loff_t
, loff_t
, unsigned char);
2274 * Candidates for mandatory locking have the setgid bit set
2275 * but no group execute bit - an otherwise meaningless combination.
2278 static inline int __mandatory_lock(struct inode
*ino
)
2280 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
2284 * ... and these candidates should be on SB_MANDLOCK mounted fs,
2285 * otherwise these will be advisory locks
2288 static inline int mandatory_lock(struct inode
*ino
)
2290 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
2293 static inline int locks_verify_locked(struct file
*file
)
2295 if (mandatory_lock(locks_inode(file
)))
2296 return locks_mandatory_locked(file
);
2300 static inline int locks_verify_truncate(struct inode
*inode
,
2304 if (!inode
->i_flctx
|| !mandatory_lock(inode
))
2307 if (size
< inode
->i_size
) {
2308 return locks_mandatory_area(inode
, f
, size
, inode
->i_size
- 1,
2311 return locks_mandatory_area(inode
, f
, inode
->i_size
, size
- 1,
2316 #else /* !CONFIG_MANDATORY_FILE_LOCKING */
2318 static inline int locks_mandatory_locked(struct file
*file
)
2323 static inline int locks_mandatory_area(struct inode
*inode
, struct file
*filp
,
2324 loff_t start
, loff_t end
, unsigned char type
)
2329 static inline int __mandatory_lock(struct inode
*inode
)
2334 static inline int mandatory_lock(struct inode
*inode
)
2339 static inline int locks_verify_locked(struct file
*file
)
2344 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
2350 #endif /* CONFIG_MANDATORY_FILE_LOCKING */
2353 #ifdef CONFIG_FILE_LOCKING
2354 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2357 * Since this check is lockless, we must ensure that any refcounts
2358 * taken are done before checking i_flctx->flc_lease. Otherwise, we
2359 * could end up racing with tasks trying to set a new lease on this
2363 if (inode
->i_flctx
&& !list_empty_careful(&inode
->i_flctx
->flc_lease
))
2364 return __break_lease(inode
, mode
, FL_LEASE
);
2368 static inline int break_deleg(struct inode
*inode
, unsigned int mode
)
2371 * Since this check is lockless, we must ensure that any refcounts
2372 * taken are done before checking i_flctx->flc_lease. Otherwise, we
2373 * could end up racing with tasks trying to set a new lease on this
2377 if (inode
->i_flctx
&& !list_empty_careful(&inode
->i_flctx
->flc_lease
))
2378 return __break_lease(inode
, mode
, FL_DELEG
);
2382 static inline int try_break_deleg(struct inode
*inode
, struct inode
**delegated_inode
)
2386 ret
= break_deleg(inode
, O_WRONLY
|O_NONBLOCK
);
2387 if (ret
== -EWOULDBLOCK
&& delegated_inode
) {
2388 *delegated_inode
= inode
;
2394 static inline int break_deleg_wait(struct inode
**delegated_inode
)
2398 ret
= break_deleg(*delegated_inode
, O_WRONLY
);
2399 iput(*delegated_inode
);
2400 *delegated_inode
= NULL
;
2404 static inline int break_layout(struct inode
*inode
, bool wait
)
2407 if (inode
->i_flctx
&& !list_empty_careful(&inode
->i_flctx
->flc_lease
))
2408 return __break_lease(inode
,
2409 wait
? O_WRONLY
: O_WRONLY
| O_NONBLOCK
,
2414 #else /* !CONFIG_FILE_LOCKING */
2415 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2420 static inline int break_deleg(struct inode
*inode
, unsigned int mode
)
2425 static inline int try_break_deleg(struct inode
*inode
, struct inode
**delegated_inode
)
2430 static inline int break_deleg_wait(struct inode
**delegated_inode
)
2436 static inline int break_layout(struct inode
*inode
, bool wait
)
2441 #endif /* CONFIG_FILE_LOCKING */
2446 const char *name
; /* pointer to actual string */
2447 const __user
char *uptr
; /* original userland pointer */
2449 struct audit_names
*aname
;
2453 extern long vfs_truncate(const struct path
*, loff_t
);
2454 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
2456 extern int vfs_fallocate(struct file
*file
, int mode
, loff_t offset
,
2458 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
2460 extern struct file
*file_open_name(struct filename
*, int, umode_t
);
2461 extern struct file
*filp_open(const char *, int, umode_t
);
2462 extern struct file
*file_open_root(struct dentry
*, struct vfsmount
*,
2463 const char *, int, umode_t
);
2464 extern struct file
* dentry_open(const struct path
*, int, const struct cred
*);
2465 extern struct file
* open_with_fake_path(const struct path
*, int,
2466 struct inode
*, const struct cred
*);
2467 static inline struct file
*file_clone_open(struct file
*file
)
2469 return dentry_open(&file
->f_path
, file
->f_flags
, file
->f_cred
);
2471 extern int filp_close(struct file
*, fl_owner_t id
);
2473 extern struct filename
*getname_flags(const char __user
*, int, int *);
2474 extern struct filename
*getname(const char __user
*);
2475 extern struct filename
*getname_kernel(const char *);
2476 extern void putname(struct filename
*name
);
2478 extern int finish_open(struct file
*file
, struct dentry
*dentry
,
2479 int (*open
)(struct inode
*, struct file
*));
2480 extern int finish_no_open(struct file
*file
, struct dentry
*dentry
);
2484 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
2487 extern void __init
vfs_caches_init_early(void);
2488 extern void __init
vfs_caches_init(void);
2490 extern struct kmem_cache
*names_cachep
;
2492 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
2493 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2496 extern int register_blkdev(unsigned int, const char *);
2497 extern void unregister_blkdev(unsigned int, const char *);
2498 extern void bdev_unhash_inode(dev_t dev
);
2499 extern struct block_device
*bdget(dev_t
);
2500 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2501 extern void bd_set_size(struct block_device
*, loff_t size
);
2502 extern void bd_forget(struct inode
*inode
);
2503 extern void bdput(struct block_device
*);
2504 extern void invalidate_bdev(struct block_device
*);
2505 extern void iterate_bdevs(void (*)(struct block_device
*, void *), void *);
2506 extern int sync_blockdev(struct block_device
*bdev
);
2507 extern void kill_bdev(struct block_device
*);
2508 extern struct super_block
*freeze_bdev(struct block_device
*);
2509 extern void emergency_thaw_all(void);
2510 extern void emergency_thaw_bdev(struct super_block
*sb
);
2511 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2512 extern int fsync_bdev(struct block_device
*);
2514 extern struct super_block
*blockdev_superblock
;
2516 static inline bool sb_is_blkdev_sb(struct super_block
*sb
)
2518 return sb
== blockdev_superblock
;
2521 static inline void bd_forget(struct inode
*inode
) {}
2522 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2523 static inline void kill_bdev(struct block_device
*bdev
) {}
2524 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2526 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2531 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2536 static inline int emergency_thaw_bdev(struct super_block
*sb
)
2541 static inline void iterate_bdevs(void (*f
)(struct block_device
*, void *), void *arg
)
2545 static inline bool sb_is_blkdev_sb(struct super_block
*sb
)
2550 extern int sync_filesystem(struct super_block
*);
2551 extern const struct file_operations def_blk_fops
;
2552 extern const struct file_operations def_chr_fops
;
2554 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2555 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2556 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2557 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2558 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2560 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2562 extern void blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2563 extern int __blkdev_reread_part(struct block_device
*bdev
);
2564 extern int blkdev_reread_part(struct block_device
*bdev
);
2567 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2568 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2569 struct gendisk
*disk
);
2571 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2572 struct gendisk
*disk
)
2576 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2577 struct gendisk
*disk
)
2584 #define CHRDEV_MAJOR_MAX 512
2585 /* Marks the bottom of the first segment of free char majors */
2586 #define CHRDEV_MAJOR_DYN_END 234
2587 /* Marks the top and bottom of the second segment of free char majors */
2588 #define CHRDEV_MAJOR_DYN_EXT_START 511
2589 #define CHRDEV_MAJOR_DYN_EXT_END 384
2591 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2592 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2593 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2594 unsigned int count
, const char *name
,
2595 const struct file_operations
*fops
);
2596 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2597 unsigned int count
, const char *name
);
2598 extern void unregister_chrdev_region(dev_t
, unsigned);
2599 extern void chrdev_show(struct seq_file
*,off_t
);
2601 static inline int register_chrdev(unsigned int major
, const char *name
,
2602 const struct file_operations
*fops
)
2604 return __register_chrdev(major
, 0, 256, name
, fops
);
2607 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2609 __unregister_chrdev(major
, 0, 256, name
);
2612 /* fs/block_dev.c */
2613 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2614 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2617 #define BLKDEV_MAJOR_MAX 512
2618 extern const char *__bdevname(dev_t
, char *buffer
);
2619 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2620 extern struct block_device
*lookup_bdev(const char *);
2621 extern void blkdev_show(struct seq_file
*,off_t
);
2624 #define BLKDEV_MAJOR_MAX 0
2627 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2629 /* Invalid inode operations -- fs/bad_inode.c */
2630 extern void make_bad_inode(struct inode
*);
2631 extern bool is_bad_inode(struct inode
*);
2634 extern void check_disk_size_change(struct gendisk
*disk
,
2635 struct block_device
*bdev
, bool verbose
);
2636 extern int revalidate_disk(struct gendisk
*);
2637 extern int check_disk_change(struct block_device
*);
2638 extern int __invalidate_device(struct block_device
*, bool);
2639 extern int invalidate_partition(struct gendisk
*, int);
2641 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2642 pgoff_t start
, pgoff_t end
);
2644 static inline void invalidate_remote_inode(struct inode
*inode
)
2646 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2647 S_ISLNK(inode
->i_mode
))
2648 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2650 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2651 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2652 pgoff_t start
, pgoff_t end
);
2653 extern int write_inode_now(struct inode
*, int);
2654 extern int filemap_fdatawrite(struct address_space
*);
2655 extern int filemap_flush(struct address_space
*);
2656 extern int filemap_fdatawait_keep_errors(struct address_space
*mapping
);
2657 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2660 static inline int filemap_fdatawait(struct address_space
*mapping
)
2662 return filemap_fdatawait_range(mapping
, 0, LLONG_MAX
);
2665 extern bool filemap_range_has_page(struct address_space
*, loff_t lstart
,
2667 extern int filemap_write_and_wait(struct address_space
*mapping
);
2668 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2669 loff_t lstart
, loff_t lend
);
2670 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2671 loff_t start
, loff_t end
, int sync_mode
);
2672 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2673 loff_t start
, loff_t end
);
2674 extern int filemap_check_errors(struct address_space
*mapping
);
2675 extern void __filemap_set_wb_err(struct address_space
*mapping
, int err
);
2677 extern int __must_check
file_fdatawait_range(struct file
*file
, loff_t lstart
,
2679 extern int __must_check
file_check_and_advance_wb_err(struct file
*file
);
2680 extern int __must_check
file_write_and_wait_range(struct file
*file
,
2681 loff_t start
, loff_t end
);
2683 static inline int file_write_and_wait(struct file
*file
)
2685 return file_write_and_wait_range(file
, 0, LLONG_MAX
);
2689 * filemap_set_wb_err - set a writeback error on an address_space
2690 * @mapping: mapping in which to set writeback error
2691 * @err: error to be set in mapping
2693 * When writeback fails in some way, we must record that error so that
2694 * userspace can be informed when fsync and the like are called. We endeavor
2695 * to report errors on any file that was open at the time of the error. Some
2696 * internal callers also need to know when writeback errors have occurred.
2698 * When a writeback error occurs, most filesystems will want to call
2699 * filemap_set_wb_err to record the error in the mapping so that it will be
2700 * automatically reported whenever fsync is called on the file.
2702 static inline void filemap_set_wb_err(struct address_space
*mapping
, int err
)
2704 /* Fastpath for common case of no error */
2706 __filemap_set_wb_err(mapping
, err
);
2710 * filemap_check_wb_error - has an error occurred since the mark was sampled?
2711 * @mapping: mapping to check for writeback errors
2712 * @since: previously-sampled errseq_t
2714 * Grab the errseq_t value from the mapping, and see if it has changed "since"
2715 * the given value was sampled.
2717 * If it has then report the latest error set, otherwise return 0.
2719 static inline int filemap_check_wb_err(struct address_space
*mapping
,
2722 return errseq_check(&mapping
->wb_err
, since
);
2726 * filemap_sample_wb_err - sample the current errseq_t to test for later errors
2727 * @mapping: mapping to be sampled
2729 * Writeback errors are always reported relative to a particular sample point
2730 * in the past. This function provides those sample points.
2732 static inline errseq_t
filemap_sample_wb_err(struct address_space
*mapping
)
2734 return errseq_sample(&mapping
->wb_err
);
2737 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2739 extern int vfs_fsync(struct file
*file
, int datasync
);
2742 * Sync the bytes written if this was a synchronous write. Expect ki_pos
2743 * to already be updated for the write, and will return either the amount
2744 * of bytes passed in, or an error if syncing the file failed.
2746 static inline ssize_t
generic_write_sync(struct kiocb
*iocb
, ssize_t count
)
2748 if (iocb
->ki_flags
& IOCB_DSYNC
) {
2749 int ret
= vfs_fsync_range(iocb
->ki_filp
,
2750 iocb
->ki_pos
- count
, iocb
->ki_pos
- 1,
2751 (iocb
->ki_flags
& IOCB_SYNC
) ? 0 : 1);
2759 extern void emergency_sync(void);
2760 extern void emergency_remount(void);
2762 extern sector_t
bmap(struct inode
*, sector_t
);
2764 extern int notify_change(struct dentry
*, struct iattr
*, struct inode
**);
2765 extern int inode_permission(struct inode
*, int);
2766 extern int generic_permission(struct inode
*, int);
2767 extern int __check_sticky(struct inode
*dir
, struct inode
*inode
);
2769 static inline bool execute_ok(struct inode
*inode
)
2771 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2774 static inline void file_start_write(struct file
*file
)
2776 if (!S_ISREG(file_inode(file
)->i_mode
))
2778 __sb_start_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
, true);
2781 static inline bool file_start_write_trylock(struct file
*file
)
2783 if (!S_ISREG(file_inode(file
)->i_mode
))
2785 return __sb_start_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
, false);
2788 static inline void file_end_write(struct file
*file
)
2790 if (!S_ISREG(file_inode(file
)->i_mode
))
2792 __sb_end_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
);
2796 * get_write_access() gets write permission for a file.
2797 * put_write_access() releases this write permission.
2798 * This is used for regular files.
2799 * We cannot support write (and maybe mmap read-write shared) accesses and
2800 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2801 * can have the following values:
2802 * 0: no writers, no VM_DENYWRITE mappings
2803 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2804 * > 0: (i_writecount) users are writing to the file.
2806 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2807 * except for the cases where we don't hold i_writecount yet. Then we need to
2808 * use {get,deny}_write_access() - these functions check the sign and refuse
2809 * to do the change if sign is wrong.
2811 static inline int get_write_access(struct inode
*inode
)
2813 return atomic_inc_unless_negative(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2815 static inline int deny_write_access(struct file
*file
)
2817 struct inode
*inode
= file_inode(file
);
2818 return atomic_dec_unless_positive(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2820 static inline void put_write_access(struct inode
* inode
)
2822 atomic_dec(&inode
->i_writecount
);
2824 static inline void allow_write_access(struct file
*file
)
2827 atomic_inc(&file_inode(file
)->i_writecount
);
2829 static inline bool inode_is_open_for_write(const struct inode
*inode
)
2831 return atomic_read(&inode
->i_writecount
) > 0;
2835 static inline void i_readcount_dec(struct inode
*inode
)
2837 BUG_ON(!atomic_read(&inode
->i_readcount
));
2838 atomic_dec(&inode
->i_readcount
);
2840 static inline void i_readcount_inc(struct inode
*inode
)
2842 atomic_inc(&inode
->i_readcount
);
2845 static inline void i_readcount_dec(struct inode
*inode
)
2849 static inline void i_readcount_inc(struct inode
*inode
)
2854 extern int do_pipe_flags(int *, int);
2856 #define __kernel_read_file_id(id) \
2857 id(UNKNOWN, unknown) \
2858 id(FIRMWARE, firmware) \
2859 id(FIRMWARE_PREALLOC_BUFFER, firmware) \
2860 id(MODULE, kernel-module) \
2861 id(KEXEC_IMAGE, kexec-image) \
2862 id(KEXEC_INITRAMFS, kexec-initramfs) \
2863 id(POLICY, security-policy) \
2864 id(X509_CERTIFICATE, x509-certificate) \
2867 #define __fid_enumify(ENUM, dummy) READING_ ## ENUM,
2868 #define __fid_stringify(dummy, str) #str,
2870 enum kernel_read_file_id
{
2871 __kernel_read_file_id(__fid_enumify
)
2874 static const char * const kernel_read_file_str
[] = {
2875 __kernel_read_file_id(__fid_stringify
)
2878 static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id
)
2880 if ((unsigned)id
>= READING_MAX_ID
)
2881 return kernel_read_file_str
[READING_UNKNOWN
];
2883 return kernel_read_file_str
[id
];
2886 extern int kernel_read_file(struct file
*, void **, loff_t
*, loff_t
,
2887 enum kernel_read_file_id
);
2888 extern int kernel_read_file_from_path(const char *, void **, loff_t
*, loff_t
,
2889 enum kernel_read_file_id
);
2890 extern int kernel_read_file_from_fd(int, void **, loff_t
*, loff_t
,
2891 enum kernel_read_file_id
);
2892 extern ssize_t
kernel_read(struct file
*, void *, size_t, loff_t
*);
2893 extern ssize_t
kernel_write(struct file
*, const void *, size_t, loff_t
*);
2894 extern ssize_t
__kernel_write(struct file
*, const void *, size_t, loff_t
*);
2895 extern struct file
* open_exec(const char *);
2897 /* fs/dcache.c -- generic fs support functions */
2898 extern bool is_subdir(struct dentry
*, struct dentry
*);
2899 extern bool path_is_under(const struct path
*, const struct path
*);
2901 extern char *file_path(struct file
*, char *, int);
2903 #include <linux/err.h>
2905 /* needed for stackable file system support */
2906 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int whence
);
2908 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int whence
);
2910 extern int inode_init_always(struct super_block
*, struct inode
*);
2911 extern void inode_init_once(struct inode
*);
2912 extern void address_space_init_once(struct address_space
*mapping
);
2913 extern struct inode
* igrab(struct inode
*);
2914 extern ino_t
iunique(struct super_block
*, ino_t
);
2915 extern int inode_needs_sync(struct inode
*inode
);
2916 extern int generic_delete_inode(struct inode
*inode
);
2917 static inline int generic_drop_inode(struct inode
*inode
)
2919 return !inode
->i_nlink
|| inode_unhashed(inode
);
2922 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2923 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2925 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2926 int (*test
)(struct inode
*, void *), void *data
);
2927 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2929 extern struct inode
*inode_insert5(struct inode
*inode
, unsigned long hashval
,
2930 int (*test
)(struct inode
*, void *),
2931 int (*set
)(struct inode
*, void *),
2933 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2934 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2935 extern struct inode
*find_inode_nowait(struct super_block
*,
2937 int (*match
)(struct inode
*,
2938 unsigned long, void *),
2940 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
2941 extern int insert_inode_locked(struct inode
*);
2942 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2943 extern void lockdep_annotate_inode_mutex_key(struct inode
*inode
);
2945 static inline void lockdep_annotate_inode_mutex_key(struct inode
*inode
) { };
2947 extern void unlock_new_inode(struct inode
*);
2948 extern void discard_new_inode(struct inode
*);
2949 extern unsigned int get_next_ino(void);
2950 extern void evict_inodes(struct super_block
*sb
);
2952 extern void __iget(struct inode
* inode
);
2953 extern void iget_failed(struct inode
*);
2954 extern void clear_inode(struct inode
*);
2955 extern void __destroy_inode(struct inode
*);
2956 extern struct inode
*new_inode_pseudo(struct super_block
*sb
);
2957 extern struct inode
*new_inode(struct super_block
*sb
);
2958 extern void free_inode_nonrcu(struct inode
*inode
);
2959 extern int should_remove_suid(struct dentry
*);
2960 extern int file_remove_privs(struct file
*);
2962 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
2963 static inline void insert_inode_hash(struct inode
*inode
)
2965 __insert_inode_hash(inode
, inode
->i_ino
);
2968 extern void __remove_inode_hash(struct inode
*);
2969 static inline void remove_inode_hash(struct inode
*inode
)
2971 if (!inode_unhashed(inode
) && !hlist_fake(&inode
->i_hash
))
2972 __remove_inode_hash(inode
);
2975 extern void inode_sb_list_add(struct inode
*inode
);
2978 extern int bdev_read_only(struct block_device
*);
2980 extern int set_blocksize(struct block_device
*, int);
2981 extern int sb_set_blocksize(struct super_block
*, int);
2982 extern int sb_min_blocksize(struct super_block
*, int);
2984 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
2985 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
2986 extern ssize_t
generic_write_checks(struct kiocb
*, struct iov_iter
*);
2987 extern int generic_remap_checks(struct file
*file_in
, loff_t pos_in
,
2988 struct file
*file_out
, loff_t pos_out
,
2989 uint64_t *count
, unsigned int remap_flags
);
2990 extern ssize_t
generic_file_read_iter(struct kiocb
*, struct iov_iter
*);
2991 extern ssize_t
__generic_file_write_iter(struct kiocb
*, struct iov_iter
*);
2992 extern ssize_t
generic_file_write_iter(struct kiocb
*, struct iov_iter
*);
2993 extern ssize_t
generic_file_direct_write(struct kiocb
*, struct iov_iter
*);
2994 extern ssize_t
generic_perform_write(struct file
*, struct iov_iter
*, loff_t
);
2996 ssize_t
vfs_iter_read(struct file
*file
, struct iov_iter
*iter
, loff_t
*ppos
,
2998 ssize_t
vfs_iter_write(struct file
*file
, struct iov_iter
*iter
, loff_t
*ppos
,
3001 /* fs/block_dev.c */
3002 extern ssize_t
blkdev_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
);
3003 extern ssize_t
blkdev_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
);
3004 extern int blkdev_fsync(struct file
*filp
, loff_t start
, loff_t end
,
3006 extern void block_sync_page(struct page
*page
);
3009 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
3010 struct pipe_inode_info
*, size_t, unsigned int);
3011 extern ssize_t
iter_file_splice_write(struct pipe_inode_info
*,
3012 struct file
*, loff_t
*, size_t, unsigned int);
3013 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
3014 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
3015 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
3016 loff_t
*opos
, size_t len
, unsigned int flags
);
3020 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
3021 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int whence
);
3022 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int whence
);
3023 extern loff_t
vfs_setpos(struct file
*file
, loff_t offset
, loff_t maxsize
);
3024 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int whence
);
3025 extern loff_t
generic_file_llseek_size(struct file
*file
, loff_t offset
,
3026 int whence
, loff_t maxsize
, loff_t eof
);
3027 extern loff_t
fixed_size_llseek(struct file
*file
, loff_t offset
,
3028 int whence
, loff_t size
);
3029 extern loff_t
no_seek_end_llseek_size(struct file
*, loff_t
, int, loff_t
);
3030 extern loff_t
no_seek_end_llseek(struct file
*, loff_t
, int);
3031 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
3032 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
3035 typedef void (dio_submit_t
)(struct bio
*bio
, struct inode
*inode
,
3036 loff_t file_offset
);
3039 /* need locking between buffered and direct access */
3042 /* filesystem does not support filling holes */
3043 DIO_SKIP_HOLES
= 0x02,
3046 void dio_end_io(struct bio
*bio
);
3047 void dio_warn_stale_pagecache(struct file
*filp
);
3049 ssize_t
__blockdev_direct_IO(struct kiocb
*iocb
, struct inode
*inode
,
3050 struct block_device
*bdev
, struct iov_iter
*iter
,
3051 get_block_t get_block
,
3052 dio_iodone_t end_io
, dio_submit_t submit_io
,
3055 static inline ssize_t
blockdev_direct_IO(struct kiocb
*iocb
,
3056 struct inode
*inode
,
3057 struct iov_iter
*iter
,
3058 get_block_t get_block
)
3060 return __blockdev_direct_IO(iocb
, inode
, inode
->i_sb
->s_bdev
, iter
,
3061 get_block
, NULL
, NULL
, DIO_LOCKING
| DIO_SKIP_HOLES
);
3065 void inode_dio_wait(struct inode
*inode
);
3068 * inode_dio_begin - signal start of a direct I/O requests
3069 * @inode: inode the direct I/O happens on
3071 * This is called once we've finished processing a direct I/O request,
3072 * and is used to wake up callers waiting for direct I/O to be quiesced.
3074 static inline void inode_dio_begin(struct inode
*inode
)
3076 atomic_inc(&inode
->i_dio_count
);
3080 * inode_dio_end - signal finish of a direct I/O requests
3081 * @inode: inode the direct I/O happens on
3083 * This is called once we've finished processing a direct I/O request,
3084 * and is used to wake up callers waiting for direct I/O to be quiesced.
3086 static inline void inode_dio_end(struct inode
*inode
)
3088 if (atomic_dec_and_test(&inode
->i_dio_count
))
3089 wake_up_bit(&inode
->i_state
, __I_DIO_WAKEUP
);
3092 extern void inode_set_flags(struct inode
*inode
, unsigned int flags
,
3095 extern const struct file_operations generic_ro_fops
;
3097 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
3099 extern int readlink_copy(char __user
*, int, const char *);
3100 extern int page_readlink(struct dentry
*, char __user
*, int);
3101 extern const char *page_get_link(struct dentry
*, struct inode
*,
3102 struct delayed_call
*);
3103 extern void page_put_link(void *);
3104 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
3106 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
3107 extern const struct inode_operations page_symlink_inode_operations
;
3108 extern void kfree_link(void *);
3109 extern void generic_fillattr(struct inode
*, struct kstat
*);
3110 extern int vfs_getattr_nosec(const struct path
*, struct kstat
*, u32
, unsigned int);
3111 extern int vfs_getattr(const struct path
*, struct kstat
*, u32
, unsigned int);
3112 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
3113 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
3114 void __inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
3115 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
3116 static inline loff_t
__inode_get_bytes(struct inode
*inode
)
3118 return (((loff_t
)inode
->i_blocks
) << 9) + inode
->i_bytes
;
3120 loff_t
inode_get_bytes(struct inode
*inode
);
3121 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
3122 const char *simple_get_link(struct dentry
*, struct inode
*,
3123 struct delayed_call
*);
3124 extern const struct inode_operations simple_symlink_inode_operations
;
3126 extern int iterate_dir(struct file
*, struct dir_context
*);
3128 extern int vfs_statx(int, const char __user
*, int, struct kstat
*, u32
);
3129 extern int vfs_statx_fd(unsigned int, struct kstat
*, u32
, unsigned int);
3131 static inline int vfs_stat(const char __user
*filename
, struct kstat
*stat
)
3133 return vfs_statx(AT_FDCWD
, filename
, AT_NO_AUTOMOUNT
,
3134 stat
, STATX_BASIC_STATS
);
3136 static inline int vfs_lstat(const char __user
*name
, struct kstat
*stat
)
3138 return vfs_statx(AT_FDCWD
, name
, AT_SYMLINK_NOFOLLOW
| AT_NO_AUTOMOUNT
,
3139 stat
, STATX_BASIC_STATS
);
3141 static inline int vfs_fstatat(int dfd
, const char __user
*filename
,
3142 struct kstat
*stat
, int flags
)
3144 return vfs_statx(dfd
, filename
, flags
| AT_NO_AUTOMOUNT
,
3145 stat
, STATX_BASIC_STATS
);
3147 static inline int vfs_fstat(int fd
, struct kstat
*stat
)
3149 return vfs_statx_fd(fd
, stat
, STATX_BASIC_STATS
, 0);
3153 extern const char *vfs_get_link(struct dentry
*, struct delayed_call
*);
3154 extern int vfs_readlink(struct dentry
*, char __user
*, int);
3156 extern int __generic_block_fiemap(struct inode
*inode
,
3157 struct fiemap_extent_info
*fieinfo
,
3158 loff_t start
, loff_t len
,
3159 get_block_t
*get_block
);
3160 extern int generic_block_fiemap(struct inode
*inode
,
3161 struct fiemap_extent_info
*fieinfo
, u64 start
,
3162 u64 len
, get_block_t
*get_block
);
3164 extern struct file_system_type
*get_filesystem(struct file_system_type
*fs
);
3165 extern void put_filesystem(struct file_system_type
*fs
);
3166 extern struct file_system_type
*get_fs_type(const char *name
);
3167 extern struct super_block
*get_super(struct block_device
*);
3168 extern struct super_block
*get_super_thawed(struct block_device
*);
3169 extern struct super_block
*get_super_exclusive_thawed(struct block_device
*bdev
);
3170 extern struct super_block
*get_active_super(struct block_device
*bdev
);
3171 extern void drop_super(struct super_block
*sb
);
3172 extern void drop_super_exclusive(struct super_block
*sb
);
3173 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
3174 extern void iterate_supers_type(struct file_system_type
*,
3175 void (*)(struct super_block
*, void *), void *);
3177 extern int dcache_dir_open(struct inode
*, struct file
*);
3178 extern int dcache_dir_close(struct inode
*, struct file
*);
3179 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
3180 extern int dcache_readdir(struct file
*, struct dir_context
*);
3181 extern int simple_setattr(struct dentry
*, struct iattr
*);
3182 extern int simple_getattr(const struct path
*, struct kstat
*, u32
, unsigned int);
3183 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
3184 extern int simple_open(struct inode
*inode
, struct file
*file
);
3185 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
3186 extern int simple_unlink(struct inode
*, struct dentry
*);
3187 extern int simple_rmdir(struct inode
*, struct dentry
*);
3188 extern int simple_rename(struct inode
*, struct dentry
*,
3189 struct inode
*, struct dentry
*, unsigned int);
3190 extern int noop_fsync(struct file
*, loff_t
, loff_t
, int);
3191 extern int noop_set_page_dirty(struct page
*page
);
3192 extern void noop_invalidatepage(struct page
*page
, unsigned int offset
,
3193 unsigned int length
);
3194 extern ssize_t
noop_direct_IO(struct kiocb
*iocb
, struct iov_iter
*iter
);
3195 extern int simple_empty(struct dentry
*);
3196 extern int simple_readpage(struct file
*file
, struct page
*page
);
3197 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
3198 loff_t pos
, unsigned len
, unsigned flags
,
3199 struct page
**pagep
, void **fsdata
);
3200 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
3201 loff_t pos
, unsigned len
, unsigned copied
,
3202 struct page
*page
, void *fsdata
);
3203 extern int always_delete_dentry(const struct dentry
*);
3204 extern struct inode
*alloc_anon_inode(struct super_block
*);
3205 extern int simple_nosetlease(struct file
*, long, struct file_lock
**, void **);
3206 extern const struct dentry_operations simple_dentry_operations
;
3208 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, unsigned int flags
);
3209 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
3210 extern const struct file_operations simple_dir_operations
;
3211 extern const struct inode_operations simple_dir_inode_operations
;
3212 extern void make_empty_dir_inode(struct inode
*inode
);
3213 extern bool is_empty_dir_inode(struct inode
*inode
);
3214 struct tree_descr
{ const char *name
; const struct file_operations
*ops
; int mode
; };
3215 struct dentry
*d_alloc_name(struct dentry
*, const char *);
3216 extern int simple_fill_super(struct super_block
*, unsigned long,
3217 const struct tree_descr
*);
3218 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
3219 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
3221 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
3222 loff_t
*ppos
, const void *from
, size_t available
);
3223 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
3224 const void __user
*from
, size_t count
);
3226 extern int __generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
3227 extern int generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
3229 extern int generic_check_addressable(unsigned, u64
);
3231 #ifdef CONFIG_MIGRATION
3232 extern int buffer_migrate_page(struct address_space
*,
3233 struct page
*, struct page
*,
3236 #define buffer_migrate_page NULL
3239 extern int setattr_prepare(struct dentry
*, struct iattr
*);
3240 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
3241 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
3243 extern int file_update_time(struct file
*file
);
3245 static inline bool io_is_direct(struct file
*filp
)
3247 return (filp
->f_flags
& O_DIRECT
) || IS_DAX(filp
->f_mapping
->host
);
3250 static inline bool vma_is_dax(struct vm_area_struct
*vma
)
3252 return vma
->vm_file
&& IS_DAX(vma
->vm_file
->f_mapping
->host
);
3255 static inline bool vma_is_fsdax(struct vm_area_struct
*vma
)
3257 struct inode
*inode
;
3261 if (!vma_is_dax(vma
))
3263 inode
= file_inode(vma
->vm_file
);
3264 if (S_ISCHR(inode
->i_mode
))
3265 return false; /* device-dax */
3269 static inline int iocb_flags(struct file
*file
)
3272 if (file
->f_flags
& O_APPEND
)
3274 if (io_is_direct(file
))
3276 if ((file
->f_flags
& O_DSYNC
) || IS_SYNC(file
->f_mapping
->host
))
3278 if (file
->f_flags
& __O_SYNC
)
3283 static inline int kiocb_set_rw_flags(struct kiocb
*ki
, rwf_t flags
)
3285 if (unlikely(flags
& ~RWF_SUPPORTED
))
3288 if (flags
& RWF_NOWAIT
) {
3289 if (!(ki
->ki_filp
->f_mode
& FMODE_NOWAIT
))
3291 ki
->ki_flags
|= IOCB_NOWAIT
;
3293 if (flags
& RWF_HIPRI
)
3294 ki
->ki_flags
|= IOCB_HIPRI
;
3295 if (flags
& RWF_DSYNC
)
3296 ki
->ki_flags
|= IOCB_DSYNC
;
3297 if (flags
& RWF_SYNC
)
3298 ki
->ki_flags
|= (IOCB_DSYNC
| IOCB_SYNC
);
3299 if (flags
& RWF_APPEND
)
3300 ki
->ki_flags
|= IOCB_APPEND
;
3304 static inline ino_t
parent_ino(struct dentry
*dentry
)
3309 * Don't strictly need d_lock here? If the parent ino could change
3310 * then surely we'd have a deeper race in the caller?
3312 spin_lock(&dentry
->d_lock
);
3313 res
= dentry
->d_parent
->d_inode
->i_ino
;
3314 spin_unlock(&dentry
->d_lock
);
3318 /* Transaction based IO helpers */
3321 * An argresp is stored in an allocated page and holds the
3322 * size of the argument or response, along with its content
3324 struct simple_transaction_argresp
{
3329 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
3331 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
3333 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
3334 size_t size
, loff_t
*pos
);
3335 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
3337 void simple_transaction_set(struct file
*file
, size_t n
);
3340 * simple attribute files
3342 * These attributes behave similar to those in sysfs:
3344 * Writing to an attribute immediately sets a value, an open file can be
3345 * written to multiple times.
3347 * Reading from an attribute creates a buffer from the value that might get
3348 * read with multiple read calls. When the attribute has been read
3349 * completely, no further read calls are possible until the file is opened
3352 * All attributes contain a text representation of a numeric value
3353 * that are accessed with the get() and set() functions.
3355 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
3356 static int __fops ## _open(struct inode *inode, struct file *file) \
3358 __simple_attr_check_format(__fmt, 0ull); \
3359 return simple_attr_open(inode, file, __get, __set, __fmt); \
3361 static const struct file_operations __fops = { \
3362 .owner = THIS_MODULE, \
3363 .open = __fops ## _open, \
3364 .release = simple_attr_release, \
3365 .read = simple_attr_read, \
3366 .write = simple_attr_write, \
3367 .llseek = generic_file_llseek, \
3370 static inline __printf(1, 2)
3371 void __simple_attr_check_format(const char *fmt
, ...)
3373 /* don't do anything, just let the compiler check the arguments; */
3376 int simple_attr_open(struct inode
*inode
, struct file
*file
,
3377 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
3379 int simple_attr_release(struct inode
*inode
, struct file
*file
);
3380 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
3381 size_t len
, loff_t
*ppos
);
3382 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
3383 size_t len
, loff_t
*ppos
);
3386 int proc_nr_files(struct ctl_table
*table
, int write
,
3387 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
3388 int proc_nr_dentry(struct ctl_table
*table
, int write
,
3389 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
3390 int proc_nr_inodes(struct ctl_table
*table
, int write
,
3391 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
3392 int __init
get_filesystem_list(char *buf
);
3394 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
3395 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
3397 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
3398 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
3399 (flag & __FMODE_NONOTIFY)))
3401 static inline bool is_sxid(umode_t mode
)
3403 return (mode
& S_ISUID
) || ((mode
& S_ISGID
) && (mode
& S_IXGRP
));
3406 static inline int check_sticky(struct inode
*dir
, struct inode
*inode
)
3408 if (!(dir
->i_mode
& S_ISVTX
))
3411 return __check_sticky(dir
, inode
);
3414 static inline void inode_has_no_xattr(struct inode
*inode
)
3416 if (!is_sxid(inode
->i_mode
) && (inode
->i_sb
->s_flags
& SB_NOSEC
))
3417 inode
->i_flags
|= S_NOSEC
;
3420 static inline bool is_root_inode(struct inode
*inode
)
3422 return inode
== inode
->i_sb
->s_root
->d_inode
;
3425 static inline bool dir_emit(struct dir_context
*ctx
,
3426 const char *name
, int namelen
,
3427 u64 ino
, unsigned type
)
3429 return ctx
->actor(ctx
, name
, namelen
, ctx
->pos
, ino
, type
) == 0;
3431 static inline bool dir_emit_dot(struct file
*file
, struct dir_context
*ctx
)
3433 return ctx
->actor(ctx
, ".", 1, ctx
->pos
,
3434 file
->f_path
.dentry
->d_inode
->i_ino
, DT_DIR
) == 0;
3436 static inline bool dir_emit_dotdot(struct file
*file
, struct dir_context
*ctx
)
3438 return ctx
->actor(ctx
, "..", 2, ctx
->pos
,
3439 parent_ino(file
->f_path
.dentry
), DT_DIR
) == 0;
3441 static inline bool dir_emit_dots(struct file
*file
, struct dir_context
*ctx
)
3443 if (ctx
->pos
== 0) {
3444 if (!dir_emit_dot(file
, ctx
))
3448 if (ctx
->pos
== 1) {
3449 if (!dir_emit_dotdot(file
, ctx
))
3455 static inline bool dir_relax(struct inode
*inode
)
3457 inode_unlock(inode
);
3459 return !IS_DEADDIR(inode
);
3462 static inline bool dir_relax_shared(struct inode
*inode
)
3464 inode_unlock_shared(inode
);
3465 inode_lock_shared(inode
);
3466 return !IS_DEADDIR(inode
);
3469 extern bool path_noexec(const struct path
*path
);
3470 extern void inode_nohighmem(struct inode
*inode
);
3473 extern int vfs_fadvise(struct file
*file
, loff_t offset
, loff_t len
,
3476 #endif /* _LINUX_FS_H */