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 is stream-like */
157 #define FMODE_STREAM ((__force fmode_t)0x200000)
159 /* File was opened by fanotify and shouldn't generate fanotify events */
160 #define FMODE_NONOTIFY ((__force fmode_t)0x4000000)
162 /* File is capable of returning -EAGAIN if I/O will block */
163 #define FMODE_NOWAIT ((__force fmode_t)0x8000000)
165 /* File does not contribute to nr_files count */
166 #define FMODE_NOACCOUNT ((__force fmode_t)0x20000000)
169 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
170 * that indicates that they should check the contents of the iovec are
171 * valid, but not check the memory that the iovec elements
174 #define CHECK_IOVEC_ONLY -1
177 * Attribute flags. These should be or-ed together to figure out what
180 #define ATTR_MODE (1 << 0)
181 #define ATTR_UID (1 << 1)
182 #define ATTR_GID (1 << 2)
183 #define ATTR_SIZE (1 << 3)
184 #define ATTR_ATIME (1 << 4)
185 #define ATTR_MTIME (1 << 5)
186 #define ATTR_CTIME (1 << 6)
187 #define ATTR_ATIME_SET (1 << 7)
188 #define ATTR_MTIME_SET (1 << 8)
189 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
190 #define ATTR_KILL_SUID (1 << 11)
191 #define ATTR_KILL_SGID (1 << 12)
192 #define ATTR_FILE (1 << 13)
193 #define ATTR_KILL_PRIV (1 << 14)
194 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
195 #define ATTR_TIMES_SET (1 << 16)
196 #define ATTR_TOUCH (1 << 17)
199 * Whiteout is represented by a char device. The following constants define the
200 * mode and device number to use.
202 #define WHITEOUT_MODE 0
203 #define WHITEOUT_DEV 0
206 * This is the Inode Attributes structure, used for notify_change(). It
207 * uses the above definitions as flags, to know which values have changed.
208 * Also, in this manner, a Filesystem can look at only the values it cares
209 * about. Basically, these are the attributes that the VFS layer can
210 * request to change from the FS layer.
212 * Derek Atkins <warlord@MIT.EDU> 94-10-20
215 unsigned int ia_valid
;
220 struct timespec64 ia_atime
;
221 struct timespec64 ia_mtime
;
222 struct timespec64 ia_ctime
;
225 * Not an attribute, but an auxiliary info for filesystems wanting to
226 * implement an ftruncate() like method. NOTE: filesystem should
227 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
229 struct file
*ia_file
;
233 * Includes for diskquotas.
235 #include <linux/quota.h>
238 * Maximum number of layers of fs stack. Needs to be limited to
239 * prevent kernel stack overflow
241 #define FILESYSTEM_MAX_STACK_DEPTH 2
244 * enum positive_aop_returns - aop return codes with specific semantics
246 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
247 * completed, that the page is still locked, and
248 * should be considered active. The VM uses this hint
249 * to return the page to the active list -- it won't
250 * be a candidate for writeback again in the near
251 * future. Other callers must be careful to unlock
252 * the page if they get this return. Returned by
255 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
256 * unlocked it and the page might have been truncated.
257 * The caller should back up to acquiring a new page and
258 * trying again. The aop will be taking reasonable
259 * precautions not to livelock. If the caller held a page
260 * reference, it should drop it before retrying. Returned
263 * address_space_operation functions return these large constants to indicate
264 * special semantics to the caller. These are much larger than the bytes in a
265 * page to allow for functions that return the number of bytes operated on in a
269 enum positive_aop_returns
{
270 AOP_WRITEPAGE_ACTIVATE
= 0x80000,
271 AOP_TRUNCATED_PAGE
= 0x80001,
274 #define AOP_FLAG_CONT_EXPAND 0x0001 /* called from cont_expand */
275 #define AOP_FLAG_NOFS 0x0002 /* used by filesystem to direct
276 * helper code (eg buffer layer)
277 * to clear GFP_FS from alloc */
280 * oh the beauties of C type declarations.
283 struct address_space
;
284 struct writeback_control
;
287 * Write life time hint values.
288 * Stored in struct inode as u8.
291 WRITE_LIFE_NOT_SET
= 0,
292 WRITE_LIFE_NONE
= RWH_WRITE_LIFE_NONE
,
293 WRITE_LIFE_SHORT
= RWH_WRITE_LIFE_SHORT
,
294 WRITE_LIFE_MEDIUM
= RWH_WRITE_LIFE_MEDIUM
,
295 WRITE_LIFE_LONG
= RWH_WRITE_LIFE_LONG
,
296 WRITE_LIFE_EXTREME
= RWH_WRITE_LIFE_EXTREME
,
299 #define IOCB_EVENTFD (1 << 0)
300 #define IOCB_APPEND (1 << 1)
301 #define IOCB_DIRECT (1 << 2)
302 #define IOCB_HIPRI (1 << 3)
303 #define IOCB_DSYNC (1 << 4)
304 #define IOCB_SYNC (1 << 5)
305 #define IOCB_WRITE (1 << 6)
306 #define IOCB_NOWAIT (1 << 7)
309 struct file
*ki_filp
;
311 /* The 'ki_filp' pointer is shared in a union for aio */
312 randomized_struct_fields_start
315 void (*ki_complete
)(struct kiocb
*iocb
, long ret
, long ret2
);
319 u16 ki_ioprio
; /* See linux/ioprio.h */
321 randomized_struct_fields_end
324 static inline bool is_sync_kiocb(struct kiocb
*kiocb
)
326 return kiocb
->ki_complete
== NULL
;
330 * "descriptor" for what we're up to with a read.
331 * This allows us to use the same read code yet
332 * have multiple different users of the data that
333 * we read from a file.
335 * The simplest case just copies the data to user
348 typedef int (*read_actor_t
)(read_descriptor_t
*, struct page
*,
349 unsigned long, unsigned long);
351 struct address_space_operations
{
352 int (*writepage
)(struct page
*page
, struct writeback_control
*wbc
);
353 int (*readpage
)(struct file
*, struct page
*);
355 /* Write back some dirty pages from this mapping. */
356 int (*writepages
)(struct address_space
*, struct writeback_control
*);
358 /* Set a page dirty. Return true if this dirtied it */
359 int (*set_page_dirty
)(struct page
*page
);
362 * Reads in the requested pages. Unlike ->readpage(), this is
363 * PURELY used for read-ahead!.
365 int (*readpages
)(struct file
*filp
, struct address_space
*mapping
,
366 struct list_head
*pages
, unsigned nr_pages
);
368 int (*write_begin
)(struct file
*, struct address_space
*mapping
,
369 loff_t pos
, unsigned len
, unsigned flags
,
370 struct page
**pagep
, void **fsdata
);
371 int (*write_end
)(struct file
*, struct address_space
*mapping
,
372 loff_t pos
, unsigned len
, unsigned copied
,
373 struct page
*page
, void *fsdata
);
375 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
376 sector_t (*bmap
)(struct address_space
*, sector_t
);
377 void (*invalidatepage
) (struct page
*, unsigned int, unsigned int);
378 int (*releasepage
) (struct page
*, gfp_t
);
379 void (*freepage
)(struct page
*);
380 ssize_t (*direct_IO
)(struct kiocb
*, struct iov_iter
*iter
);
382 * migrate the contents of a page to the specified target. If
383 * migrate_mode is MIGRATE_ASYNC, it must not block.
385 int (*migratepage
) (struct address_space
*,
386 struct page
*, struct page
*, enum migrate_mode
);
387 bool (*isolate_page
)(struct page
*, isolate_mode_t
);
388 void (*putback_page
)(struct page
*);
389 int (*launder_page
) (struct page
*);
390 int (*is_partially_uptodate
) (struct page
*, unsigned long,
392 void (*is_dirty_writeback
) (struct page
*, bool *, bool *);
393 int (*error_remove_page
)(struct address_space
*, struct page
*);
395 /* swapfile support */
396 int (*swap_activate
)(struct swap_info_struct
*sis
, struct file
*file
,
398 void (*swap_deactivate
)(struct file
*file
);
401 extern const struct address_space_operations empty_aops
;
404 * pagecache_write_begin/pagecache_write_end must be used by general code
405 * to write into the pagecache.
407 int pagecache_write_begin(struct file
*, struct address_space
*mapping
,
408 loff_t pos
, unsigned len
, unsigned flags
,
409 struct page
**pagep
, void **fsdata
);
411 int pagecache_write_end(struct file
*, struct address_space
*mapping
,
412 loff_t pos
, unsigned len
, unsigned copied
,
413 struct page
*page
, void *fsdata
);
416 * struct address_space - Contents of a cacheable, mappable object.
417 * @host: Owner, either the inode or the block_device.
418 * @i_pages: Cached pages.
419 * @gfp_mask: Memory allocation flags to use for allocating pages.
420 * @i_mmap_writable: Number of VM_SHARED mappings.
421 * @i_mmap: Tree of private and shared mappings.
422 * @i_mmap_rwsem: Protects @i_mmap and @i_mmap_writable.
423 * @nrpages: Number of page entries, protected by the i_pages lock.
424 * @nrexceptional: Shadow or DAX entries, protected by the i_pages lock.
425 * @writeback_index: Writeback starts here.
427 * @flags: Error bits and flags (AS_*).
428 * @wb_err: The most recent error which has occurred.
429 * @private_lock: For use by the owner of the address_space.
430 * @private_list: For use by the owner of the address_space.
431 * @private_data: For use by the owner of the address_space.
433 struct address_space
{
435 struct xarray i_pages
;
437 atomic_t i_mmap_writable
;
438 struct rb_root_cached i_mmap
;
439 struct rw_semaphore i_mmap_rwsem
;
440 unsigned long nrpages
;
441 unsigned long nrexceptional
;
442 pgoff_t writeback_index
;
443 const struct address_space_operations
*a_ops
;
446 spinlock_t private_lock
;
447 struct list_head private_list
;
449 } __attribute__((aligned(sizeof(long)))) __randomize_layout
;
451 * On most architectures that alignment is already the case; but
452 * must be enforced here for CRIS, to let the least significant bit
453 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
455 struct request_queue
;
457 struct block_device
{
458 dev_t bd_dev
; /* not a kdev_t - it's a search key */
460 struct inode
* bd_inode
; /* will die */
461 struct super_block
* bd_super
;
462 struct mutex bd_mutex
; /* open/close mutex */
466 bool bd_write_holder
;
468 struct list_head bd_holder_disks
;
470 struct block_device
* bd_contains
;
471 unsigned bd_block_size
;
473 struct hd_struct
* bd_part
;
474 /* number of times partitions within this device have been opened. */
475 unsigned bd_part_count
;
477 struct gendisk
* bd_disk
;
478 struct request_queue
* bd_queue
;
479 struct backing_dev_info
*bd_bdi
;
480 struct list_head bd_list
;
482 * Private data. You must have bd_claim'ed the block_device
483 * to use this. NOTE: bd_claim allows an owner to claim
484 * the same device multiple times, the owner must take special
485 * care to not mess up bd_private for that case.
487 unsigned long bd_private
;
489 /* The counter of freeze processes */
490 int bd_fsfreeze_count
;
491 /* Mutex for freeze */
492 struct mutex bd_fsfreeze_mutex
;
493 } __randomize_layout
;
495 /* XArray tags, for tagging dirty and writeback pages in the pagecache. */
496 #define PAGECACHE_TAG_DIRTY XA_MARK_0
497 #define PAGECACHE_TAG_WRITEBACK XA_MARK_1
498 #define PAGECACHE_TAG_TOWRITE XA_MARK_2
501 * Returns true if any of the pages in the mapping are marked with the tag.
503 static inline bool mapping_tagged(struct address_space
*mapping
, xa_mark_t tag
)
505 return xa_marked(&mapping
->i_pages
, tag
);
508 static inline void i_mmap_lock_write(struct address_space
*mapping
)
510 down_write(&mapping
->i_mmap_rwsem
);
513 static inline void i_mmap_unlock_write(struct address_space
*mapping
)
515 up_write(&mapping
->i_mmap_rwsem
);
518 static inline void i_mmap_lock_read(struct address_space
*mapping
)
520 down_read(&mapping
->i_mmap_rwsem
);
523 static inline void i_mmap_unlock_read(struct address_space
*mapping
)
525 up_read(&mapping
->i_mmap_rwsem
);
529 * Might pages of this file be mapped into userspace?
531 static inline int mapping_mapped(struct address_space
*mapping
)
533 return !RB_EMPTY_ROOT(&mapping
->i_mmap
.rb_root
);
537 * Might pages of this file have been modified in userspace?
538 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
539 * marks vma as VM_SHARED if it is shared, and the file was opened for
540 * writing i.e. vma may be mprotected writable even if now readonly.
542 * If i_mmap_writable is negative, no new writable mappings are allowed. You
543 * can only deny writable mappings, if none exists right now.
545 static inline int mapping_writably_mapped(struct address_space
*mapping
)
547 return atomic_read(&mapping
->i_mmap_writable
) > 0;
550 static inline int mapping_map_writable(struct address_space
*mapping
)
552 return atomic_inc_unless_negative(&mapping
->i_mmap_writable
) ?
556 static inline void mapping_unmap_writable(struct address_space
*mapping
)
558 atomic_dec(&mapping
->i_mmap_writable
);
561 static inline int mapping_deny_writable(struct address_space
*mapping
)
563 return atomic_dec_unless_positive(&mapping
->i_mmap_writable
) ?
567 static inline void mapping_allow_writable(struct address_space
*mapping
)
569 atomic_inc(&mapping
->i_mmap_writable
);
573 * Use sequence counter to get consistent i_size on 32-bit processors.
575 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
576 #include <linux/seqlock.h>
577 #define __NEED_I_SIZE_ORDERED
578 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
580 #define i_size_ordered_init(inode) do { } while (0)
584 #define ACL_NOT_CACHED ((void *)(-1))
585 #define ACL_DONT_CACHE ((void *)(-3))
587 static inline struct posix_acl
*
588 uncached_acl_sentinel(struct task_struct
*task
)
590 return (void *)task
+ 1;
594 is_uncached_acl(struct posix_acl
*acl
)
596 return (long)acl
& 1;
599 #define IOP_FASTPERM 0x0001
600 #define IOP_LOOKUP 0x0002
601 #define IOP_NOFOLLOW 0x0004
602 #define IOP_XATTR 0x0008
603 #define IOP_DEFAULT_READLINK 0x0010
605 struct fsnotify_mark_connector
;
608 * Keep mostly read-only and often accessed (especially for
609 * the RCU path lookup and 'stat' data) fields at the beginning
610 * of the 'struct inode'
614 unsigned short i_opflags
;
617 unsigned int i_flags
;
619 #ifdef CONFIG_FS_POSIX_ACL
620 struct posix_acl
*i_acl
;
621 struct posix_acl
*i_default_acl
;
624 const struct inode_operations
*i_op
;
625 struct super_block
*i_sb
;
626 struct address_space
*i_mapping
;
628 #ifdef CONFIG_SECURITY
632 /* Stat data, not accessed from path walking */
635 * Filesystems may only read i_nlink directly. They shall use the
636 * following functions for modification:
638 * (set|clear|inc|drop)_nlink
639 * inode_(inc|dec)_link_count
642 const unsigned int i_nlink
;
643 unsigned int __i_nlink
;
647 struct timespec64 i_atime
;
648 struct timespec64 i_mtime
;
649 struct timespec64 i_ctime
;
650 spinlock_t i_lock
; /* i_blocks, i_bytes, maybe i_size */
651 unsigned short i_bytes
;
656 #ifdef __NEED_I_SIZE_ORDERED
657 seqcount_t i_size_seqcount
;
661 unsigned long i_state
;
662 struct rw_semaphore i_rwsem
;
664 unsigned long dirtied_when
; /* jiffies of first dirtying */
665 unsigned long dirtied_time_when
;
667 struct hlist_node i_hash
;
668 struct list_head i_io_list
; /* backing dev IO list */
669 #ifdef CONFIG_CGROUP_WRITEBACK
670 struct bdi_writeback
*i_wb
; /* the associated cgroup wb */
672 /* foreign inode detection, see wbc_detach_inode() */
674 u16 i_wb_frn_avg_time
;
675 u16 i_wb_frn_history
;
677 struct list_head i_lru
; /* inode LRU list */
678 struct list_head i_sb_list
;
679 struct list_head i_wb_list
; /* backing dev writeback list */
681 struct hlist_head i_dentry
;
682 struct rcu_head i_rcu
;
684 atomic64_t i_version
;
686 atomic_t i_dio_count
;
687 atomic_t i_writecount
;
689 atomic_t i_readcount
; /* struct files open RO */
691 const struct file_operations
*i_fop
; /* former ->i_op->default_file_ops */
692 struct file_lock_context
*i_flctx
;
693 struct address_space i_data
;
694 struct list_head i_devices
;
696 struct pipe_inode_info
*i_pipe
;
697 struct block_device
*i_bdev
;
705 #ifdef CONFIG_FSNOTIFY
706 __u32 i_fsnotify_mask
; /* all events this inode cares about */
707 struct fsnotify_mark_connector __rcu
*i_fsnotify_marks
;
710 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
711 struct fscrypt_info
*i_crypt_info
;
714 void *i_private
; /* fs or device private pointer */
715 } __randomize_layout
;
717 static inline unsigned int i_blocksize(const struct inode
*node
)
719 return (1 << node
->i_blkbits
);
722 static inline int inode_unhashed(struct inode
*inode
)
724 return hlist_unhashed(&inode
->i_hash
);
728 * __mark_inode_dirty expects inodes to be hashed. Since we don't
729 * want special inodes in the fileset inode space, we make them
730 * appear hashed, but do not put on any lists. hlist_del()
731 * will work fine and require no locking.
733 static inline void inode_fake_hash(struct inode
*inode
)
735 hlist_add_fake(&inode
->i_hash
);
739 * inode->i_mutex nesting subclasses for the lock validator:
741 * 0: the object of the current VFS operation
745 * 4: second non-directory
746 * 5: second parent (when locking independent directories in rename)
748 * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two
749 * non-directories at once.
751 * The locking order between these classes is
752 * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory
754 enum inode_i_mutex_lock_class
764 static inline void inode_lock(struct inode
*inode
)
766 down_write(&inode
->i_rwsem
);
769 static inline void inode_unlock(struct inode
*inode
)
771 up_write(&inode
->i_rwsem
);
774 static inline void inode_lock_shared(struct inode
*inode
)
776 down_read(&inode
->i_rwsem
);
779 static inline void inode_unlock_shared(struct inode
*inode
)
781 up_read(&inode
->i_rwsem
);
784 static inline int inode_trylock(struct inode
*inode
)
786 return down_write_trylock(&inode
->i_rwsem
);
789 static inline int inode_trylock_shared(struct inode
*inode
)
791 return down_read_trylock(&inode
->i_rwsem
);
794 static inline int inode_is_locked(struct inode
*inode
)
796 return rwsem_is_locked(&inode
->i_rwsem
);
799 static inline void inode_lock_nested(struct inode
*inode
, unsigned subclass
)
801 down_write_nested(&inode
->i_rwsem
, subclass
);
804 static inline void inode_lock_shared_nested(struct inode
*inode
, unsigned subclass
)
806 down_read_nested(&inode
->i_rwsem
, subclass
);
809 void lock_two_nondirectories(struct inode
*, struct inode
*);
810 void unlock_two_nondirectories(struct inode
*, struct inode
*);
813 * NOTE: in a 32bit arch with a preemptable kernel and
814 * an UP compile the i_size_read/write must be atomic
815 * with respect to the local cpu (unlike with preempt disabled),
816 * but they don't need to be atomic with respect to other cpus like in
817 * true SMP (so they need either to either locally disable irq around
818 * the read or for example on x86 they can be still implemented as a
819 * cmpxchg8b without the need of the lock prefix). For SMP compiles
820 * and 64bit archs it makes no difference if preempt is enabled or not.
822 static inline loff_t
i_size_read(const struct inode
*inode
)
824 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
829 seq
= read_seqcount_begin(&inode
->i_size_seqcount
);
830 i_size
= inode
->i_size
;
831 } while (read_seqcount_retry(&inode
->i_size_seqcount
, seq
));
833 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
837 i_size
= inode
->i_size
;
841 return inode
->i_size
;
846 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
847 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
848 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
850 static inline void i_size_write(struct inode
*inode
, loff_t i_size
)
852 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
854 write_seqcount_begin(&inode
->i_size_seqcount
);
855 inode
->i_size
= i_size
;
856 write_seqcount_end(&inode
->i_size_seqcount
);
858 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
860 inode
->i_size
= i_size
;
863 inode
->i_size
= i_size
;
867 static inline unsigned iminor(const struct inode
*inode
)
869 return MINOR(inode
->i_rdev
);
872 static inline unsigned imajor(const struct inode
*inode
)
874 return MAJOR(inode
->i_rdev
);
877 extern struct block_device
*I_BDEV(struct inode
*inode
);
880 rwlock_t lock
; /* protects pid, uid, euid fields */
881 struct pid
*pid
; /* pid or -pgrp where SIGIO should be sent */
882 enum pid_type pid_type
; /* Kind of process group SIGIO should be sent to */
883 kuid_t uid
, euid
; /* uid/euid of process setting the owner */
884 int signum
; /* posix.1b rt signal to be delivered on IO */
888 * Track a single file's readahead state
890 struct file_ra_state
{
891 pgoff_t start
; /* where readahead started */
892 unsigned int size
; /* # of readahead pages */
893 unsigned int async_size
; /* do asynchronous readahead when
894 there are only # of pages ahead */
896 unsigned int ra_pages
; /* Maximum readahead window */
897 unsigned int mmap_miss
; /* Cache miss stat for mmap accesses */
898 loff_t prev_pos
; /* Cache last read() position */
902 * Check if @index falls in the readahead windows.
904 static inline int ra_has_index(struct file_ra_state
*ra
, pgoff_t index
)
906 return (index
>= ra
->start
&&
907 index
< ra
->start
+ ra
->size
);
912 struct llist_node fu_llist
;
913 struct rcu_head fu_rcuhead
;
916 struct inode
*f_inode
; /* cached value */
917 const struct file_operations
*f_op
;
920 * Protects f_ep_links, f_flags.
921 * Must not be taken from IRQ context.
924 enum rw_hint f_write_hint
;
925 atomic_long_t f_count
;
926 unsigned int f_flags
;
928 struct mutex f_pos_lock
;
930 struct fown_struct f_owner
;
931 const struct cred
*f_cred
;
932 struct file_ra_state f_ra
;
935 #ifdef CONFIG_SECURITY
938 /* needed for tty driver, and maybe others */
942 /* Used by fs/eventpoll.c to link all the hooks to this file */
943 struct list_head f_ep_links
;
944 struct list_head f_tfile_llink
;
945 #endif /* #ifdef CONFIG_EPOLL */
946 struct address_space
*f_mapping
;
949 __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */
954 /* file identifier */
955 unsigned char f_handle
[0];
958 static inline struct file
*get_file(struct file
*f
)
960 atomic_long_inc(&f
->f_count
);
963 #define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count)
964 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
965 #define file_count(x) atomic_long_read(&(x)->f_count)
967 #define MAX_NON_LFS ((1UL<<31) - 1)
969 /* Page cache limit. The filesystems should put that into their s_maxbytes
970 limits, otherwise bad things can happen in VM. */
971 #if BITS_PER_LONG==32
972 #define MAX_LFS_FILESIZE ((loff_t)ULONG_MAX << PAGE_SHIFT)
973 #elif BITS_PER_LONG==64
974 #define MAX_LFS_FILESIZE ((loff_t)LLONG_MAX)
979 #define FL_DELEG 4 /* NFSv4 delegation */
980 #define FL_ACCESS 8 /* not trying to lock, just looking */
981 #define FL_EXISTS 16 /* when unlocking, test for existence */
982 #define FL_LEASE 32 /* lease held on this file */
983 #define FL_CLOSE 64 /* unlock on close */
984 #define FL_SLEEP 128 /* A blocking lock */
985 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
986 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
987 #define FL_OFDLCK 1024 /* lock is "owned" by struct file */
988 #define FL_LAYOUT 2048 /* outstanding pNFS layout */
990 #define FL_CLOSE_POSIX (FL_POSIX | FL_CLOSE)
993 * Special return value from posix_lock_file() and vfs_lock_file() for
994 * asynchronous locking.
996 #define FILE_LOCK_DEFERRED 1
998 /* legacy typedef, should eventually be removed */
999 typedef void *fl_owner_t
;
1003 struct file_lock_operations
{
1004 void (*fl_copy_lock
)(struct file_lock
*, struct file_lock
*);
1005 void (*fl_release_private
)(struct file_lock
*);
1008 struct lock_manager_operations
{
1009 int (*lm_compare_owner
)(struct file_lock
*, struct file_lock
*);
1010 unsigned long (*lm_owner_key
)(struct file_lock
*);
1011 fl_owner_t (*lm_get_owner
)(fl_owner_t
);
1012 void (*lm_put_owner
)(fl_owner_t
);
1013 void (*lm_notify
)(struct file_lock
*); /* unblock callback */
1014 int (*lm_grant
)(struct file_lock
*, int);
1015 bool (*lm_break
)(struct file_lock
*);
1016 int (*lm_change
)(struct file_lock
*, int, struct list_head
*);
1017 void (*lm_setup
)(struct file_lock
*, void **);
1020 struct lock_manager
{
1021 struct list_head list
;
1023 * NFSv4 and up also want opens blocked during the grace period;
1030 void locks_start_grace(struct net
*, struct lock_manager
*);
1031 void locks_end_grace(struct lock_manager
*);
1032 bool locks_in_grace(struct net
*);
1033 bool opens_in_grace(struct net
*);
1035 /* that will die - we need it for nfs_lock_info */
1036 #include <linux/nfs_fs_i.h>
1039 * struct file_lock represents a generic "file lock". It's used to represent
1040 * POSIX byte range locks, BSD (flock) locks, and leases. It's important to
1041 * note that the same struct is used to represent both a request for a lock and
1042 * the lock itself, but the same object is never used for both.
1044 * FIXME: should we create a separate "struct lock_request" to help distinguish
1047 * The varous i_flctx lists are ordered by:
1050 * 2) lock range start
1053 * Obviously, the last two criteria only matter for POSIX locks.
1056 struct file_lock
*fl_blocker
; /* The lock, that is blocking us */
1057 struct list_head fl_list
; /* link into file_lock_context */
1058 struct hlist_node fl_link
; /* node in global lists */
1059 struct list_head fl_blocked_requests
; /* list of requests with
1060 * ->fl_blocker pointing here
1062 struct list_head fl_blocked_member
; /* node in
1063 * ->fl_blocker->fl_blocked_requests
1065 fl_owner_t fl_owner
;
1066 unsigned int fl_flags
;
1067 unsigned char fl_type
;
1068 unsigned int fl_pid
;
1069 int fl_link_cpu
; /* what cpu's list is this on? */
1070 wait_queue_head_t fl_wait
;
1071 struct file
*fl_file
;
1075 struct fasync_struct
* fl_fasync
; /* for lease break notifications */
1076 /* for lease breaks: */
1077 unsigned long fl_break_time
;
1078 unsigned long fl_downgrade_time
;
1080 const struct file_lock_operations
*fl_ops
; /* Callbacks for filesystems */
1081 const struct lock_manager_operations
*fl_lmops
; /* Callbacks for lockmanagers */
1083 struct nfs_lock_info nfs_fl
;
1084 struct nfs4_lock_info nfs4_fl
;
1086 struct list_head link
; /* link in AFS vnode's pending_locks list */
1087 int state
; /* state of grant or error if -ve */
1090 } __randomize_layout
;
1092 struct file_lock_context
{
1093 spinlock_t flc_lock
;
1094 struct list_head flc_flock
;
1095 struct list_head flc_posix
;
1096 struct list_head flc_lease
;
1099 /* The following constant reflects the upper bound of the file/locking space */
1101 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
1102 #define OFFSET_MAX INT_LIMIT(loff_t)
1103 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
1106 extern void send_sigio(struct fown_struct
*fown
, int fd
, int band
);
1108 #define locks_inode(f) file_inode(f)
1110 #ifdef CONFIG_FILE_LOCKING
1111 extern int fcntl_getlk(struct file
*, unsigned int, struct flock
*);
1112 extern int fcntl_setlk(unsigned int, struct file
*, unsigned int,
1115 #if BITS_PER_LONG == 32
1116 extern int fcntl_getlk64(struct file
*, unsigned int, struct flock64
*);
1117 extern int fcntl_setlk64(unsigned int, struct file
*, unsigned int,
1121 extern int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
);
1122 extern int fcntl_getlease(struct file
*filp
);
1125 void locks_free_lock_context(struct inode
*inode
);
1126 void locks_free_lock(struct file_lock
*fl
);
1127 extern void locks_init_lock(struct file_lock
*);
1128 extern struct file_lock
* locks_alloc_lock(void);
1129 extern void locks_copy_lock(struct file_lock
*, struct file_lock
*);
1130 extern void locks_copy_conflock(struct file_lock
*, struct file_lock
*);
1131 extern void locks_remove_posix(struct file
*, fl_owner_t
);
1132 extern void locks_remove_file(struct file
*);
1133 extern void locks_release_private(struct file_lock
*);
1134 extern void posix_test_lock(struct file
*, struct file_lock
*);
1135 extern int posix_lock_file(struct file
*, struct file_lock
*, struct file_lock
*);
1136 extern int locks_delete_block(struct file_lock
*);
1137 extern int vfs_test_lock(struct file
*, struct file_lock
*);
1138 extern int vfs_lock_file(struct file
*, unsigned int, struct file_lock
*, struct file_lock
*);
1139 extern int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
);
1140 extern int locks_lock_inode_wait(struct inode
*inode
, struct file_lock
*fl
);
1141 extern int __break_lease(struct inode
*inode
, unsigned int flags
, unsigned int type
);
1142 extern void lease_get_mtime(struct inode
*, struct timespec64
*time
);
1143 extern int generic_setlease(struct file
*, long, struct file_lock
**, void **priv
);
1144 extern int vfs_setlease(struct file
*, long, struct file_lock
**, void **);
1145 extern int lease_modify(struct file_lock
*, int, struct list_head
*);
1146 struct files_struct
;
1147 extern void show_fd_locks(struct seq_file
*f
,
1148 struct file
*filp
, struct files_struct
*files
);
1149 #else /* !CONFIG_FILE_LOCKING */
1150 static inline int fcntl_getlk(struct file
*file
, unsigned int cmd
,
1151 struct flock __user
*user
)
1156 static inline int fcntl_setlk(unsigned int fd
, struct file
*file
,
1157 unsigned int cmd
, struct flock __user
*user
)
1162 #if BITS_PER_LONG == 32
1163 static inline int fcntl_getlk64(struct file
*file
, unsigned int cmd
,
1164 struct flock64 __user
*user
)
1169 static inline int fcntl_setlk64(unsigned int fd
, struct file
*file
,
1170 unsigned int cmd
, struct flock64 __user
*user
)
1175 static inline int fcntl_setlease(unsigned int fd
, struct file
*filp
, long arg
)
1180 static inline int fcntl_getlease(struct file
*filp
)
1186 locks_free_lock_context(struct inode
*inode
)
1190 static inline void locks_init_lock(struct file_lock
*fl
)
1195 static inline void locks_copy_conflock(struct file_lock
*new, struct file_lock
*fl
)
1200 static inline void locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
1205 static inline void locks_remove_posix(struct file
*filp
, fl_owner_t owner
)
1210 static inline void locks_remove_file(struct file
*filp
)
1215 static inline void posix_test_lock(struct file
*filp
, struct file_lock
*fl
)
1220 static inline int posix_lock_file(struct file
*filp
, struct file_lock
*fl
,
1221 struct file_lock
*conflock
)
1226 static inline int locks_delete_block(struct file_lock
*waiter
)
1231 static inline int vfs_test_lock(struct file
*filp
, struct file_lock
*fl
)
1236 static inline int vfs_lock_file(struct file
*filp
, unsigned int cmd
,
1237 struct file_lock
*fl
, struct file_lock
*conf
)
1242 static inline int vfs_cancel_lock(struct file
*filp
, struct file_lock
*fl
)
1247 static inline int locks_lock_inode_wait(struct inode
*inode
, struct file_lock
*fl
)
1252 static inline int __break_lease(struct inode
*inode
, unsigned int mode
, unsigned int type
)
1257 static inline void lease_get_mtime(struct inode
*inode
,
1258 struct timespec64
*time
)
1263 static inline int generic_setlease(struct file
*filp
, long arg
,
1264 struct file_lock
**flp
, void **priv
)
1269 static inline int vfs_setlease(struct file
*filp
, long arg
,
1270 struct file_lock
**lease
, void **priv
)
1275 static inline int lease_modify(struct file_lock
*fl
, int arg
,
1276 struct list_head
*dispose
)
1281 struct files_struct
;
1282 static inline void show_fd_locks(struct seq_file
*f
,
1283 struct file
*filp
, struct files_struct
*files
) {}
1284 #endif /* !CONFIG_FILE_LOCKING */
1286 static inline struct inode
*file_inode(const struct file
*f
)
1291 static inline struct dentry
*file_dentry(const struct file
*file
)
1293 return d_real(file
->f_path
.dentry
, file_inode(file
));
1296 static inline int locks_lock_file_wait(struct file
*filp
, struct file_lock
*fl
)
1298 return locks_lock_inode_wait(locks_inode(filp
), fl
);
1301 struct fasync_struct
{
1305 struct fasync_struct
*fa_next
; /* singly linked list */
1306 struct file
*fa_file
;
1307 struct rcu_head fa_rcu
;
1310 #define FASYNC_MAGIC 0x4601
1312 /* SMP safe fasync helpers: */
1313 extern int fasync_helper(int, struct file
*, int, struct fasync_struct
**);
1314 extern struct fasync_struct
*fasync_insert_entry(int, struct file
*, struct fasync_struct
**, struct fasync_struct
*);
1315 extern int fasync_remove_entry(struct file
*, struct fasync_struct
**);
1316 extern struct fasync_struct
*fasync_alloc(void);
1317 extern void fasync_free(struct fasync_struct
*);
1319 /* can be called from interrupts */
1320 extern void kill_fasync(struct fasync_struct
**, int, int);
1322 extern int setfl(int fd
, struct file
* filp
, unsigned long arg
);
1323 extern void __f_setown(struct file
*filp
, struct pid
*, enum pid_type
, int force
);
1324 extern int f_setown(struct file
*filp
, unsigned long arg
, int force
);
1325 extern void f_delown(struct file
*filp
);
1326 extern pid_t
f_getown(struct file
*filp
);
1327 extern int send_sigurg(struct fown_struct
*fown
);
1330 * sb->s_flags. Note that these mirror the equivalent MS_* flags where
1331 * represented in both.
1333 #define SB_RDONLY 1 /* Mount read-only */
1334 #define SB_NOSUID 2 /* Ignore suid and sgid bits */
1335 #define SB_NODEV 4 /* Disallow access to device special files */
1336 #define SB_NOEXEC 8 /* Disallow program execution */
1337 #define SB_SYNCHRONOUS 16 /* Writes are synced at once */
1338 #define SB_MANDLOCK 64 /* Allow mandatory locks on an FS */
1339 #define SB_DIRSYNC 128 /* Directory modifications are synchronous */
1340 #define SB_NOATIME 1024 /* Do not update access times. */
1341 #define SB_NODIRATIME 2048 /* Do not update directory access times */
1342 #define SB_SILENT 32768
1343 #define SB_POSIXACL (1<<16) /* VFS does not apply the umask */
1344 #define SB_KERNMOUNT (1<<22) /* this is a kern_mount call */
1345 #define SB_I_VERSION (1<<23) /* Update inode I_version field */
1346 #define SB_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
1348 /* These sb flags are internal to the kernel */
1349 #define SB_SUBMOUNT (1<<26)
1350 #define SB_NOSEC (1<<28)
1351 #define SB_BORN (1<<29)
1352 #define SB_ACTIVE (1<<30)
1353 #define SB_NOUSER (1<<31)
1359 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1360 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1361 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1362 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1363 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1366 #define SB_I_CGROUPWB 0x00000001 /* cgroup-aware writeback enabled */
1367 #define SB_I_NOEXEC 0x00000002 /* Ignore executables on this fs */
1368 #define SB_I_NODEV 0x00000004 /* Ignore devices on this fs */
1369 #define SB_I_MULTIROOT 0x00000008 /* Multiple roots to the dentry tree */
1370 #define SB_I_NOSUID 0x00000010 /* Ignore suid on this fs */
1372 /* sb->s_iflags to limit user namespace mounts */
1373 #define SB_I_USERNS_VISIBLE 0x00000010 /* fstype already mounted */
1374 #define SB_I_IMA_UNVERIFIABLE_SIGNATURE 0x00000020
1375 #define SB_I_UNTRUSTED_MOUNTER 0x00000040
1377 /* Possible states of 'frozen' field */
1379 SB_UNFROZEN
= 0, /* FS is unfrozen */
1380 SB_FREEZE_WRITE
= 1, /* Writes, dir ops, ioctls frozen */
1381 SB_FREEZE_PAGEFAULT
= 2, /* Page faults stopped as well */
1382 SB_FREEZE_FS
= 3, /* For internal FS use (e.g. to stop
1383 * internal threads if needed) */
1384 SB_FREEZE_COMPLETE
= 4, /* ->freeze_fs finished successfully */
1387 #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
1390 int frozen
; /* Is sb frozen? */
1391 wait_queue_head_t wait_unfrozen
; /* for get_super_thawed() */
1392 struct percpu_rw_semaphore rw_sem
[SB_FREEZE_LEVELS
];
1395 struct super_block
{
1396 struct list_head s_list
; /* Keep this first */
1397 dev_t s_dev
; /* search index; _not_ kdev_t */
1398 unsigned char s_blocksize_bits
;
1399 unsigned long s_blocksize
;
1400 loff_t s_maxbytes
; /* Max file size */
1401 struct file_system_type
*s_type
;
1402 const struct super_operations
*s_op
;
1403 const struct dquot_operations
*dq_op
;
1404 const struct quotactl_ops
*s_qcop
;
1405 const struct export_operations
*s_export_op
;
1406 unsigned long s_flags
;
1407 unsigned long s_iflags
; /* internal SB_I_* flags */
1408 unsigned long s_magic
;
1409 struct dentry
*s_root
;
1410 struct rw_semaphore s_umount
;
1413 #ifdef CONFIG_SECURITY
1416 const struct xattr_handler
**s_xattr
;
1417 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
1418 const struct fscrypt_operations
*s_cop
;
1420 struct hlist_bl_head s_roots
; /* alternate root dentries for NFS */
1421 struct list_head s_mounts
; /* list of mounts; _not_ for fs use */
1422 struct block_device
*s_bdev
;
1423 struct backing_dev_info
*s_bdi
;
1424 struct mtd_info
*s_mtd
;
1425 struct hlist_node s_instances
;
1426 unsigned int s_quota_types
; /* Bitmask of supported quota types */
1427 struct quota_info s_dquot
; /* Diskquota specific options */
1429 struct sb_writers s_writers
;
1432 * Keep s_fs_info, s_time_gran, s_fsnotify_mask, and
1433 * s_fsnotify_marks together for cache efficiency. They are frequently
1434 * accessed and rarely modified.
1436 void *s_fs_info
; /* Filesystem private info */
1438 /* Granularity of c/m/atime in ns (cannot be worse than a second) */
1440 #ifdef CONFIG_FSNOTIFY
1441 __u32 s_fsnotify_mask
;
1442 struct fsnotify_mark_connector __rcu
*s_fsnotify_marks
;
1445 char s_id
[32]; /* Informational name */
1446 uuid_t s_uuid
; /* UUID */
1448 unsigned int s_max_links
;
1452 * The next field is for VFS *only*. No filesystems have any business
1453 * even looking at it. You had been warned.
1455 struct mutex s_vfs_rename_mutex
; /* Kludge */
1458 * Filesystem subtype. If non-empty the filesystem type field
1459 * in /proc/mounts will be "type.subtype"
1463 const struct dentry_operations
*s_d_op
; /* default d_op for dentries */
1466 * Saved pool identifier for cleancache (-1 means none)
1468 int cleancache_poolid
;
1470 struct shrinker s_shrink
; /* per-sb shrinker handle */
1472 /* Number of inodes with nlink == 0 but still referenced */
1473 atomic_long_t s_remove_count
;
1475 /* Pending fsnotify inode refs */
1476 atomic_long_t s_fsnotify_inode_refs
;
1478 /* Being remounted read-only */
1479 int s_readonly_remount
;
1481 /* AIO completions deferred from interrupt context */
1482 struct workqueue_struct
*s_dio_done_wq
;
1483 struct hlist_head s_pins
;
1486 * Owning user namespace and default context in which to
1487 * interpret filesystem uids, gids, quotas, device nodes,
1488 * xattrs and security labels.
1490 struct user_namespace
*s_user_ns
;
1493 * The list_lru structure is essentially just a pointer to a table
1494 * of per-node lru lists, each of which has its own spinlock.
1495 * There is no need to put them into separate cachelines.
1497 struct list_lru s_dentry_lru
;
1498 struct list_lru s_inode_lru
;
1499 struct rcu_head rcu
;
1500 struct work_struct destroy_work
;
1502 struct mutex s_sync_lock
; /* sync serialisation lock */
1505 * Indicates how deep in a filesystem stack this SB is
1509 /* s_inode_list_lock protects s_inodes */
1510 spinlock_t s_inode_list_lock ____cacheline_aligned_in_smp
;
1511 struct list_head s_inodes
; /* all inodes */
1513 spinlock_t s_inode_wblist_lock
;
1514 struct list_head s_inodes_wb
; /* writeback inodes */
1515 } __randomize_layout
;
1517 /* Helper functions so that in most cases filesystems will
1518 * not need to deal directly with kuid_t and kgid_t and can
1519 * instead deal with the raw numeric values that are stored
1520 * in the filesystem.
1522 static inline uid_t
i_uid_read(const struct inode
*inode
)
1524 return from_kuid(inode
->i_sb
->s_user_ns
, inode
->i_uid
);
1527 static inline gid_t
i_gid_read(const struct inode
*inode
)
1529 return from_kgid(inode
->i_sb
->s_user_ns
, inode
->i_gid
);
1532 static inline void i_uid_write(struct inode
*inode
, uid_t uid
)
1534 inode
->i_uid
= make_kuid(inode
->i_sb
->s_user_ns
, uid
);
1537 static inline void i_gid_write(struct inode
*inode
, gid_t gid
)
1539 inode
->i_gid
= make_kgid(inode
->i_sb
->s_user_ns
, gid
);
1542 extern struct timespec64
timespec64_trunc(struct timespec64 t
, unsigned gran
);
1543 extern struct timespec64
current_time(struct inode
*inode
);
1546 * Snapshotting support.
1549 void __sb_end_write(struct super_block
*sb
, int level
);
1550 int __sb_start_write(struct super_block
*sb
, int level
, bool wait
);
1552 #define __sb_writers_acquired(sb, lev) \
1553 percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
1554 #define __sb_writers_release(sb, lev) \
1555 percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
1558 * sb_end_write - drop write access to a superblock
1559 * @sb: the super we wrote to
1561 * Decrement number of writers to the filesystem. Wake up possible waiters
1562 * wanting to freeze the filesystem.
1564 static inline void sb_end_write(struct super_block
*sb
)
1566 __sb_end_write(sb
, SB_FREEZE_WRITE
);
1570 * sb_end_pagefault - drop write access to a superblock from a page fault
1571 * @sb: the super we wrote to
1573 * Decrement number of processes handling write page fault to the filesystem.
1574 * Wake up possible waiters wanting to freeze the filesystem.
1576 static inline void sb_end_pagefault(struct super_block
*sb
)
1578 __sb_end_write(sb
, SB_FREEZE_PAGEFAULT
);
1582 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
1583 * @sb: the super we wrote to
1585 * Decrement fs-internal number of writers to the filesystem. Wake up possible
1586 * waiters wanting to freeze the filesystem.
1588 static inline void sb_end_intwrite(struct super_block
*sb
)
1590 __sb_end_write(sb
, SB_FREEZE_FS
);
1594 * sb_start_write - get write access to a superblock
1595 * @sb: the super we write to
1597 * When a process wants to write data or metadata to a file system (i.e. dirty
1598 * a page or an inode), it should embed the operation in a sb_start_write() -
1599 * sb_end_write() pair to get exclusion against file system freezing. This
1600 * function increments number of writers preventing freezing. If the file
1601 * system is already frozen, the function waits until the file system is
1604 * Since freeze protection behaves as a lock, users have to preserve
1605 * ordering of freeze protection and other filesystem locks. Generally,
1606 * freeze protection should be the outermost lock. In particular, we have:
1609 * -> i_mutex (write path, truncate, directory ops, ...)
1610 * -> s_umount (freeze_super, thaw_super)
1612 static inline void sb_start_write(struct super_block
*sb
)
1614 __sb_start_write(sb
, SB_FREEZE_WRITE
, true);
1617 static inline int sb_start_write_trylock(struct super_block
*sb
)
1619 return __sb_start_write(sb
, SB_FREEZE_WRITE
, false);
1623 * sb_start_pagefault - get write access to a superblock from a page fault
1624 * @sb: the super we write to
1626 * When a process starts handling write page fault, it should embed the
1627 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
1628 * exclusion against file system freezing. This is needed since the page fault
1629 * is going to dirty a page. This function increments number of running page
1630 * faults preventing freezing. If the file system is already frozen, the
1631 * function waits until the file system is thawed.
1633 * Since page fault freeze protection behaves as a lock, users have to preserve
1634 * ordering of freeze protection and other filesystem locks. It is advised to
1635 * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
1636 * handling code implies lock dependency:
1639 * -> sb_start_pagefault
1641 static inline void sb_start_pagefault(struct super_block
*sb
)
1643 __sb_start_write(sb
, SB_FREEZE_PAGEFAULT
, true);
1647 * sb_start_intwrite - get write access to a superblock for internal fs purposes
1648 * @sb: the super we write to
1650 * This is the third level of protection against filesystem freezing. It is
1651 * free for use by a filesystem. The only requirement is that it must rank
1652 * below sb_start_pagefault.
1654 * For example filesystem can call sb_start_intwrite() when starting a
1655 * transaction which somewhat eases handling of freezing for internal sources
1656 * of filesystem changes (internal fs threads, discarding preallocation on file
1659 static inline void sb_start_intwrite(struct super_block
*sb
)
1661 __sb_start_write(sb
, SB_FREEZE_FS
, true);
1664 static inline int sb_start_intwrite_trylock(struct super_block
*sb
)
1666 return __sb_start_write(sb
, SB_FREEZE_FS
, false);
1670 extern bool inode_owner_or_capable(const struct inode
*inode
);
1673 * VFS helper functions..
1675 extern int vfs_create(struct inode
*, struct dentry
*, umode_t
, bool);
1676 extern int vfs_mkdir(struct inode
*, struct dentry
*, umode_t
);
1677 extern int vfs_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
1678 extern int vfs_symlink(struct inode
*, struct dentry
*, const char *);
1679 extern int vfs_link(struct dentry
*, struct inode
*, struct dentry
*, struct inode
**);
1680 extern int vfs_rmdir(struct inode
*, struct dentry
*);
1681 extern int vfs_unlink(struct inode
*, struct dentry
*, struct inode
**);
1682 extern int vfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*, struct inode
**, unsigned int);
1683 extern int vfs_whiteout(struct inode
*, struct dentry
*);
1685 extern struct dentry
*vfs_tmpfile(struct dentry
*dentry
, umode_t mode
,
1688 int vfs_mkobj(struct dentry
*, umode_t
,
1689 int (*f
)(struct dentry
*, umode_t
, void *),
1692 extern long vfs_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
1695 * VFS file helper functions.
1697 extern void inode_init_owner(struct inode
*inode
, const struct inode
*dir
,
1699 extern bool may_open_dev(const struct path
*path
);
1701 * VFS FS_IOC_FIEMAP helper definitions.
1703 struct fiemap_extent_info
{
1704 unsigned int fi_flags
; /* Flags as passed from user */
1705 unsigned int fi_extents_mapped
; /* Number of mapped extents */
1706 unsigned int fi_extents_max
; /* Size of fiemap_extent array */
1707 struct fiemap_extent __user
*fi_extents_start
; /* Start of
1708 fiemap_extent array */
1710 int fiemap_fill_next_extent(struct fiemap_extent_info
*info
, u64 logical
,
1711 u64 phys
, u64 len
, u32 flags
);
1712 int fiemap_check_flags(struct fiemap_extent_info
*fieinfo
, u32 fs_flags
);
1717 * NOTE! These match bits 12..15 of stat.st_mode
1718 * (ie "(i_mode >> 12) & 15").
1720 #define DT_UNKNOWN 0
1731 * This is the "filldir" function type, used by readdir() to let
1732 * the kernel specify what kind of dirent layout it wants to have.
1733 * This allows the kernel to read directories into kernel space or
1734 * to have different dirent layouts depending on the binary type.
1737 typedef int (*filldir_t
)(struct dir_context
*, const char *, int, loff_t
, u64
,
1740 struct dir_context
{
1745 struct block_device_operations
;
1747 /* These macros are for out of kernel modules to test that
1748 * the kernel supports the unlocked_ioctl and compat_ioctl
1749 * fields in struct file_operations. */
1750 #define HAVE_COMPAT_IOCTL 1
1751 #define HAVE_UNLOCKED_IOCTL 1
1754 * These flags let !MMU mmap() govern direct device mapping vs immediate
1755 * copying more easily for MAP_PRIVATE, especially for ROM filesystems.
1757 * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE)
1758 * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED)
1759 * NOMMU_MAP_READ: Can be mapped for reading
1760 * NOMMU_MAP_WRITE: Can be mapped for writing
1761 * NOMMU_MAP_EXEC: Can be mapped for execution
1763 #define NOMMU_MAP_COPY 0x00000001
1764 #define NOMMU_MAP_DIRECT 0x00000008
1765 #define NOMMU_MAP_READ VM_MAYREAD
1766 #define NOMMU_MAP_WRITE VM_MAYWRITE
1767 #define NOMMU_MAP_EXEC VM_MAYEXEC
1769 #define NOMMU_VMFLAGS \
1770 (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC)
1773 * These flags control the behavior of the remap_file_range function pointer.
1774 * If it is called with len == 0 that means "remap to end of source file".
1775 * See Documentation/filesystems/vfs.txt for more details about this call.
1777 * REMAP_FILE_DEDUP: only remap if contents identical (i.e. deduplicate)
1778 * REMAP_FILE_CAN_SHORTEN: caller can handle a shortened request
1780 #define REMAP_FILE_DEDUP (1 << 0)
1781 #define REMAP_FILE_CAN_SHORTEN (1 << 1)
1784 * These flags signal that the caller is ok with altering various aspects of
1785 * the behavior of the remap operation. The changes must be made by the
1786 * implementation; the vfs remap helper functions can take advantage of them.
1787 * Flags in this category exist to preserve the quirky behavior of the hoisted
1788 * btrfs clone/dedupe ioctls.
1790 #define REMAP_FILE_ADVISORY (REMAP_FILE_CAN_SHORTEN)
1794 struct file_operations
{
1795 struct module
*owner
;
1796 loff_t (*llseek
) (struct file
*, loff_t
, int);
1797 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
1798 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
1799 ssize_t (*read_iter
) (struct kiocb
*, struct iov_iter
*);
1800 ssize_t (*write_iter
) (struct kiocb
*, struct iov_iter
*);
1801 int (*iterate
) (struct file
*, struct dir_context
*);
1802 int (*iterate_shared
) (struct file
*, struct dir_context
*);
1803 __poll_t (*poll
) (struct file
*, struct poll_table_struct
*);
1804 long (*unlocked_ioctl
) (struct file
*, unsigned int, unsigned long);
1805 long (*compat_ioctl
) (struct file
*, unsigned int, unsigned long);
1806 int (*mmap
) (struct file
*, struct vm_area_struct
*);
1807 unsigned long mmap_supported_flags
;
1808 int (*open
) (struct inode
*, struct file
*);
1809 int (*flush
) (struct file
*, fl_owner_t id
);
1810 int (*release
) (struct inode
*, struct file
*);
1811 int (*fsync
) (struct file
*, loff_t
, loff_t
, int datasync
);
1812 int (*fasync
) (int, struct file
*, int);
1813 int (*lock
) (struct file
*, int, struct file_lock
*);
1814 ssize_t (*sendpage
) (struct file
*, struct page
*, int, size_t, loff_t
*, int);
1815 unsigned long (*get_unmapped_area
)(struct file
*, unsigned long, unsigned long, unsigned long, unsigned long);
1816 int (*check_flags
)(int);
1817 int (*setfl
)(struct file
*, unsigned long);
1818 int (*flock
) (struct file
*, int, struct file_lock
*);
1819 ssize_t (*splice_write
)(struct pipe_inode_info
*, struct file
*, loff_t
*, size_t, unsigned int);
1820 ssize_t (*splice_read
)(struct file
*, loff_t
*, struct pipe_inode_info
*, size_t, unsigned int);
1821 int (*setlease
)(struct file
*, long, struct file_lock
**, void **);
1822 long (*fallocate
)(struct file
*file
, int mode
, loff_t offset
,
1824 void (*show_fdinfo
)(struct seq_file
*m
, struct file
*f
);
1826 unsigned (*mmap_capabilities
)(struct file
*);
1828 ssize_t (*copy_file_range
)(struct file
*, loff_t
, struct file
*,
1829 loff_t
, size_t, unsigned int);
1830 loff_t (*remap_file_range
)(struct file
*file_in
, loff_t pos_in
,
1831 struct file
*file_out
, loff_t pos_out
,
1832 loff_t len
, unsigned int remap_flags
);
1833 int (*fadvise
)(struct file
*, loff_t
, loff_t
, int);
1834 } __randomize_layout
;
1836 struct inode_operations
{
1837 struct dentry
* (*lookup
) (struct inode
*,struct dentry
*, unsigned int);
1838 const char * (*get_link
) (struct dentry
*, struct inode
*, struct delayed_call
*);
1839 int (*permission
) (struct inode
*, int);
1840 struct posix_acl
* (*get_acl
)(struct inode
*, int);
1842 int (*readlink
) (struct dentry
*, char __user
*,int);
1844 int (*create
) (struct inode
*,struct dentry
*, umode_t
, bool);
1845 int (*link
) (struct dentry
*,struct inode
*,struct dentry
*);
1846 int (*unlink
) (struct inode
*,struct dentry
*);
1847 int (*symlink
) (struct inode
*,struct dentry
*,const char *);
1848 int (*mkdir
) (struct inode
*,struct dentry
*,umode_t
);
1849 int (*rmdir
) (struct inode
*,struct dentry
*);
1850 int (*mknod
) (struct inode
*,struct dentry
*,umode_t
,dev_t
);
1851 int (*rename
) (struct inode
*, struct dentry
*,
1852 struct inode
*, struct dentry
*, unsigned int);
1853 int (*setattr
) (struct dentry
*, struct iattr
*);
1854 int (*getattr
) (const struct path
*, struct kstat
*, u32
, unsigned int);
1855 ssize_t (*listxattr
) (struct dentry
*, char *, size_t);
1856 int (*fiemap
)(struct inode
*, struct fiemap_extent_info
*, u64 start
,
1858 int (*update_time
)(struct inode
*, struct timespec64
*, int);
1859 int (*atomic_open
)(struct inode
*, struct dentry
*,
1860 struct file
*, unsigned open_flag
,
1861 umode_t create_mode
);
1862 int (*tmpfile
) (struct inode
*, struct dentry
*, umode_t
);
1863 int (*set_acl
)(struct inode
*, struct posix_acl
*, int);
1864 } ____cacheline_aligned
;
1866 static inline ssize_t
call_read_iter(struct file
*file
, struct kiocb
*kio
,
1867 struct iov_iter
*iter
)
1869 return file
->f_op
->read_iter(kio
, iter
);
1872 static inline ssize_t
call_write_iter(struct file
*file
, struct kiocb
*kio
,
1873 struct iov_iter
*iter
)
1875 return file
->f_op
->write_iter(kio
, iter
);
1878 static inline int call_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1880 return file
->f_op
->mmap(file
, vma
);
1883 ssize_t
rw_copy_check_uvector(int type
, const struct iovec __user
* uvector
,
1884 unsigned long nr_segs
, unsigned long fast_segs
,
1885 struct iovec
*fast_pointer
,
1886 struct iovec
**ret_pointer
);
1888 typedef ssize_t (*vfs_readf_t
)(struct file
*, char __user
*, size_t, loff_t
*);
1889 typedef ssize_t (*vfs_writef_t
)(struct file
*, const char __user
*, size_t,
1891 vfs_readf_t
vfs_readf(struct file
*file
);
1892 vfs_writef_t
vfs_writef(struct file
*file
);
1894 extern ssize_t
__vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1895 extern ssize_t
vfs_read(struct file
*, char __user
*, size_t, loff_t
*);
1896 extern ssize_t
vfs_write(struct file
*, const char __user
*, size_t, loff_t
*);
1897 extern ssize_t
vfs_readv(struct file
*, const struct iovec __user
*,
1898 unsigned long, loff_t
*, rwf_t
);
1899 extern ssize_t
vfs_copy_file_range(struct file
*, loff_t
, struct file
*,
1900 loff_t
, size_t, unsigned int);
1901 extern int generic_remap_file_range_prep(struct file
*file_in
, loff_t pos_in
,
1902 struct file
*file_out
, loff_t pos_out
,
1904 unsigned int remap_flags
);
1905 extern loff_t
do_clone_file_range(struct file
*file_in
, loff_t pos_in
,
1906 struct file
*file_out
, loff_t pos_out
,
1907 loff_t len
, unsigned int remap_flags
);
1908 extern loff_t
vfs_clone_file_range(struct file
*file_in
, loff_t pos_in
,
1909 struct file
*file_out
, loff_t pos_out
,
1910 loff_t len
, unsigned int remap_flags
);
1911 extern int vfs_dedupe_file_range(struct file
*file
,
1912 struct file_dedupe_range
*same
);
1913 extern loff_t
vfs_dedupe_file_range_one(struct file
*src_file
, loff_t src_pos
,
1914 struct file
*dst_file
, loff_t dst_pos
,
1915 loff_t len
, unsigned int remap_flags
);
1918 struct super_operations
{
1919 struct inode
*(*alloc_inode
)(struct super_block
*sb
);
1920 void (*destroy_inode
)(struct inode
*);
1922 void (*dirty_inode
) (struct inode
*, int flags
);
1923 int (*write_inode
) (struct inode
*, struct writeback_control
*wbc
);
1924 int (*drop_inode
) (struct inode
*);
1925 void (*evict_inode
) (struct inode
*);
1926 void (*put_super
) (struct super_block
*);
1927 int (*sync_fs
)(struct super_block
*sb
, int wait
);
1928 int (*freeze_super
) (struct super_block
*);
1929 int (*freeze_fs
) (struct super_block
*);
1930 int (*thaw_super
) (struct super_block
*);
1931 int (*unfreeze_fs
) (struct super_block
*);
1932 int (*statfs
) (struct dentry
*, struct kstatfs
*);
1933 int (*remount_fs
) (struct super_block
*, int *, char *);
1934 void (*umount_begin
) (struct super_block
*);
1936 int (*show_options
)(struct seq_file
*, struct dentry
*);
1937 int (*show_devname
)(struct seq_file
*, struct dentry
*);
1938 int (*show_path
)(struct seq_file
*, struct dentry
*);
1939 int (*show_stats
)(struct seq_file
*, struct dentry
*);
1941 ssize_t (*quota_read
)(struct super_block
*, int, char *, size_t, loff_t
);
1942 ssize_t (*quota_write
)(struct super_block
*, int, const char *, size_t, loff_t
);
1943 struct dquot
**(*get_dquots
)(struct inode
*);
1945 int (*bdev_try_to_free_page
)(struct super_block
*, struct page
*, gfp_t
);
1946 long (*nr_cached_objects
)(struct super_block
*,
1947 struct shrink_control
*);
1948 long (*free_cached_objects
)(struct super_block
*,
1949 struct shrink_control
*);
1950 #if defined(CONFIG_BLK_DEV_LOOP) || defined(CONFIG_BLK_DEV_LOOP_MODULE)
1952 struct file
*(*real_loop
)(struct file
*);
1957 * Inode flags - they have no relation to superblock flags now
1959 #define S_SYNC 1 /* Writes are synced at once */
1960 #define S_NOATIME 2 /* Do not update access times */
1961 #define S_APPEND 4 /* Append-only file */
1962 #define S_IMMUTABLE 8 /* Immutable file */
1963 #define S_DEAD 16 /* removed, but still open directory */
1964 #define S_NOQUOTA 32 /* Inode is not counted to quota */
1965 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
1966 #define S_NOCMTIME 128 /* Do not update file c/mtime */
1967 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
1968 #define S_PRIVATE 512 /* Inode is fs-internal */
1969 #define S_IMA 1024 /* Inode has an associated IMA struct */
1970 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
1971 #define S_NOSEC 4096 /* no suid or xattr security attributes */
1972 #ifdef CONFIG_FS_DAX
1973 #define S_DAX 8192 /* Direct Access, avoiding the page cache */
1975 #define S_DAX 0 /* Make all the DAX code disappear */
1977 #define S_ENCRYPTED 16384 /* Encrypted file (using fs/crypto/) */
1980 * Note that nosuid etc flags are inode-specific: setting some file-system
1981 * flags just means all the inodes inherit those flags by default. It might be
1982 * possible to override it selectively if you really wanted to with some
1983 * ioctl() that is not currently implemented.
1985 * Exception: SB_RDONLY is always applied to the entire file system.
1987 * Unfortunately, it is possible to change a filesystems flags with it mounted
1988 * with files in use. This means that all of the inodes will not have their
1989 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
1990 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
1992 #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg))
1994 static inline bool sb_rdonly(const struct super_block
*sb
) { return sb
->s_flags
& SB_RDONLY
; }
1995 #define IS_RDONLY(inode) sb_rdonly((inode)->i_sb)
1996 #define IS_SYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS) || \
1997 ((inode)->i_flags & S_SYNC))
1998 #define IS_DIRSYNC(inode) (__IS_FLG(inode, SB_SYNCHRONOUS|SB_DIRSYNC) || \
1999 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
2000 #define IS_MANDLOCK(inode) __IS_FLG(inode, SB_MANDLOCK)
2001 #define IS_NOATIME(inode) __IS_FLG(inode, SB_RDONLY|SB_NOATIME)
2002 #define IS_I_VERSION(inode) __IS_FLG(inode, SB_I_VERSION)
2004 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
2005 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
2006 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
2007 #define IS_POSIXACL(inode) __IS_FLG(inode, SB_POSIXACL)
2009 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
2010 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
2011 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
2012 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
2013 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
2014 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
2015 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
2016 #define IS_DAX(inode) ((inode)->i_flags & S_DAX)
2017 #define IS_ENCRYPTED(inode) ((inode)->i_flags & S_ENCRYPTED)
2019 #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \
2020 (inode)->i_rdev == WHITEOUT_DEV)
2022 static inline bool HAS_UNMAPPED_ID(struct inode
*inode
)
2024 return !uid_valid(inode
->i_uid
) || !gid_valid(inode
->i_gid
);
2027 static inline enum rw_hint
file_write_hint(struct file
*file
)
2029 if (file
->f_write_hint
!= WRITE_LIFE_NOT_SET
)
2030 return file
->f_write_hint
;
2032 return file_inode(file
)->i_write_hint
;
2035 static inline int iocb_flags(struct file
*file
);
2037 static inline u16
ki_hint_validate(enum rw_hint hint
)
2039 typeof(((struct kiocb
*)0)->ki_hint
) max_hint
= -1;
2041 if (hint
<= max_hint
)
2046 static inline void init_sync_kiocb(struct kiocb
*kiocb
, struct file
*filp
)
2048 *kiocb
= (struct kiocb
) {
2050 .ki_flags
= iocb_flags(filp
),
2051 .ki_hint
= ki_hint_validate(file_write_hint(filp
)),
2052 .ki_ioprio
= get_current_ioprio(),
2057 * Inode state bits. Protected by inode->i_lock
2059 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
2060 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
2062 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
2063 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
2064 * various stages of removing an inode.
2066 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
2068 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
2069 * fdatasync(). i_atime is the usual cause.
2070 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
2071 * these changes separately from I_DIRTY_SYNC so that we
2072 * don't have to write inode on fdatasync() when only
2073 * mtime has changed in it.
2074 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
2075 * I_NEW Serves as both a mutex and completion notification.
2076 * New inodes set I_NEW. If two processes both create
2077 * the same inode, one of them will release its inode and
2078 * wait for I_NEW to be released before returning.
2079 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
2080 * also cause waiting on I_NEW, without I_NEW actually
2081 * being set. find_inode() uses this to prevent returning
2082 * nearly-dead inodes.
2083 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
2084 * is zero. I_FREEING must be set when I_WILL_FREE is
2086 * I_FREEING Set when inode is about to be freed but still has dirty
2087 * pages or buffers attached or the inode itself is still
2089 * I_CLEAR Added by clear_inode(). In this state the inode is
2090 * clean and can be destroyed. Inode keeps I_FREEING.
2092 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
2093 * prohibited for many purposes. iget() must wait for
2094 * the inode to be completely released, then create it
2095 * anew. Other functions will just ignore such inodes,
2096 * if appropriate. I_NEW is used for waiting.
2098 * I_SYNC Writeback of inode is running. The bit is set during
2099 * data writeback, and cleared with a wakeup on the bit
2100 * address once it is done. The bit is also used to pin
2101 * the inode in memory for flusher thread.
2103 * I_REFERENCED Marks the inode as recently references on the LRU list.
2105 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
2107 * I_WB_SWITCH Cgroup bdi_writeback switching in progress. Used to
2108 * synchronize competing switching instances and to tell
2109 * wb stat updates to grab the i_pages lock. See
2110 * inode_switch_wb_work_fn() for details.
2112 * I_OVL_INUSE Used by overlayfs to get exclusive ownership on upper
2113 * and work dirs among overlayfs mounts.
2115 * I_CREATING New object's inode in the middle of setting up.
2117 * Q: What is the difference between I_WILL_FREE and I_FREEING?
2119 #define I_DIRTY_SYNC (1 << 0)
2120 #define I_DIRTY_DATASYNC (1 << 1)
2121 #define I_DIRTY_PAGES (1 << 2)
2123 #define I_NEW (1 << __I_NEW)
2124 #define I_WILL_FREE (1 << 4)
2125 #define I_FREEING (1 << 5)
2126 #define I_CLEAR (1 << 6)
2128 #define I_SYNC (1 << __I_SYNC)
2129 #define I_REFERENCED (1 << 8)
2130 #define __I_DIO_WAKEUP 9
2131 #define I_DIO_WAKEUP (1 << __I_DIO_WAKEUP)
2132 #define I_LINKABLE (1 << 10)
2133 #define I_DIRTY_TIME (1 << 11)
2134 #define __I_DIRTY_TIME_EXPIRED 12
2135 #define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED)
2136 #define I_WB_SWITCH (1 << 13)
2137 #define I_OVL_INUSE (1 << 14)
2138 #define I_CREATING (1 << 15)
2140 #define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)
2141 #define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)
2142 #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME)
2144 extern void __mark_inode_dirty(struct inode
*, int);
2145 static inline void mark_inode_dirty(struct inode
*inode
)
2147 __mark_inode_dirty(inode
, I_DIRTY
);
2150 static inline void mark_inode_dirty_sync(struct inode
*inode
)
2152 __mark_inode_dirty(inode
, I_DIRTY_SYNC
);
2155 extern void inc_nlink(struct inode
*inode
);
2156 extern void drop_nlink(struct inode
*inode
);
2157 extern void clear_nlink(struct inode
*inode
);
2158 extern void set_nlink(struct inode
*inode
, unsigned int nlink
);
2160 static inline void inode_inc_link_count(struct inode
*inode
)
2163 mark_inode_dirty(inode
);
2166 static inline void inode_dec_link_count(struct inode
*inode
)
2169 mark_inode_dirty(inode
);
2172 enum file_time_flags
{
2179 extern bool atime_needs_update(const struct path
*, struct inode
*);
2180 extern void touch_atime(const struct path
*);
2181 static inline void file_accessed(struct file
*file
)
2183 if (!(file
->f_flags
& O_NOATIME
))
2184 touch_atime(&file
->f_path
);
2187 int sync_inode(struct inode
*inode
, struct writeback_control
*wbc
);
2188 int sync_inode_metadata(struct inode
*inode
, int wait
);
2190 struct file_system_type
{
2193 #define FS_REQUIRES_DEV 1
2194 #define FS_BINARY_MOUNTDATA 2
2195 #define FS_HAS_SUBTYPE 4
2196 #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */
2197 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */
2198 struct dentry
*(*mount
) (struct file_system_type
*, int,
2199 const char *, void *);
2200 void (*kill_sb
) (struct super_block
*);
2201 struct module
*owner
;
2202 struct file_system_type
* next
;
2203 struct hlist_head fs_supers
;
2205 struct lock_class_key s_lock_key
;
2206 struct lock_class_key s_umount_key
;
2207 struct lock_class_key s_vfs_rename_key
;
2208 struct lock_class_key s_writers_key
[SB_FREEZE_LEVELS
];
2210 struct lock_class_key i_lock_key
;
2211 struct lock_class_key i_mutex_key
;
2212 struct lock_class_key i_mutex_dir_key
;
2215 #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)
2217 extern struct dentry
*mount_ns(struct file_system_type
*fs_type
,
2218 int flags
, void *data
, void *ns
, struct user_namespace
*user_ns
,
2219 int (*fill_super
)(struct super_block
*, void *, int));
2221 extern struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
2222 int flags
, const char *dev_name
, void *data
,
2223 int (*fill_super
)(struct super_block
*, void *, int));
2225 static inline struct dentry
*mount_bdev(struct file_system_type
*fs_type
,
2226 int flags
, const char *dev_name
, void *data
,
2227 int (*fill_super
)(struct super_block
*, void *, int))
2229 return ERR_PTR(-ENODEV
);
2232 extern struct dentry
*mount_single(struct file_system_type
*fs_type
,
2233 int flags
, void *data
,
2234 int (*fill_super
)(struct super_block
*, void *, int));
2235 extern struct dentry
*mount_nodev(struct file_system_type
*fs_type
,
2236 int flags
, void *data
,
2237 int (*fill_super
)(struct super_block
*, void *, int));
2238 extern struct dentry
*mount_subtree(struct vfsmount
*mnt
, const char *path
);
2239 void generic_shutdown_super(struct super_block
*sb
);
2241 void kill_block_super(struct super_block
*sb
);
2243 static inline void kill_block_super(struct super_block
*sb
)
2248 void kill_anon_super(struct super_block
*sb
);
2249 void kill_litter_super(struct super_block
*sb
);
2250 void deactivate_super(struct super_block
*sb
);
2251 void deactivate_locked_super(struct super_block
*sb
);
2252 int set_anon_super(struct super_block
*s
, void *data
);
2253 int get_anon_bdev(dev_t
*);
2254 void free_anon_bdev(dev_t
);
2255 struct super_block
*sget_userns(struct file_system_type
*type
,
2256 int (*test
)(struct super_block
*,void *),
2257 int (*set
)(struct super_block
*,void *),
2258 int flags
, struct user_namespace
*user_ns
,
2260 struct super_block
*sget(struct file_system_type
*type
,
2261 int (*test
)(struct super_block
*,void *),
2262 int (*set
)(struct super_block
*,void *),
2263 int flags
, void *data
);
2264 extern struct dentry
*mount_pseudo_xattr(struct file_system_type
*, char *,
2265 const struct super_operations
*ops
,
2266 const struct xattr_handler
**xattr
,
2267 const struct dentry_operations
*dops
,
2270 static inline struct dentry
*
2271 mount_pseudo(struct file_system_type
*fs_type
, char *name
,
2272 const struct super_operations
*ops
,
2273 const struct dentry_operations
*dops
, unsigned long magic
)
2275 return mount_pseudo_xattr(fs_type
, name
, ops
, NULL
, dops
, magic
);
2278 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
2279 #define fops_get(fops) \
2280 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
2281 #define fops_put(fops) \
2282 do { if (fops) module_put((fops)->owner); } while(0)
2284 * This one is to be used *ONLY* from ->open() instances.
2285 * fops must be non-NULL, pinned down *and* module dependencies
2286 * should be sufficient to pin the caller down as well.
2288 #define replace_fops(f, fops) \
2290 struct file *__file = (f); \
2291 fops_put(__file->f_op); \
2292 BUG_ON(!(__file->f_op = (fops))); \
2295 extern int register_filesystem(struct file_system_type
*);
2296 extern int unregister_filesystem(struct file_system_type
*);
2297 extern struct vfsmount
*kern_mount_data(struct file_system_type
*, void *data
);
2298 #define kern_mount(type) kern_mount_data(type, NULL)
2299 extern void kern_unmount(struct vfsmount
*mnt
);
2300 extern int may_umount_tree(struct vfsmount
*);
2301 extern int may_umount(struct vfsmount
*);
2302 extern long do_mount(const char *, const char __user
*,
2303 const char *, unsigned long, void *);
2304 extern struct vfsmount
*collect_mounts(const struct path
*);
2305 extern void drop_collected_mounts(struct vfsmount
*);
2306 extern int iterate_mounts(int (*)(struct vfsmount
*, void *), void *,
2308 extern int vfs_statfs(const struct path
*, struct kstatfs
*);
2309 extern int user_statfs(const char __user
*, struct kstatfs
*);
2310 extern int fd_statfs(int, struct kstatfs
*);
2311 extern int freeze_super(struct super_block
*super
);
2312 extern int thaw_super(struct super_block
*super
);
2313 extern bool our_mnt(struct vfsmount
*mnt
);
2314 extern __printf(2, 3)
2315 int super_setup_bdi_name(struct super_block
*sb
, char *fmt
, ...);
2316 extern int super_setup_bdi(struct super_block
*sb
);
2318 extern int current_umask(void);
2320 extern void ihold(struct inode
* inode
);
2321 extern void iput(struct inode
*);
2322 extern int generic_update_time(struct inode
*, struct timespec64
*, int);
2323 extern int update_time(struct inode
*, struct timespec64
*, int);
2326 extern struct kobject
*fs_kobj
;
2328 #define MAX_RW_COUNT (INT_MAX & PAGE_MASK)
2330 #ifdef CONFIG_MANDATORY_FILE_LOCKING
2331 extern int locks_mandatory_locked(struct file
*);
2332 extern int locks_mandatory_area(struct inode
*, struct file
*, loff_t
, loff_t
, unsigned char);
2335 * Candidates for mandatory locking have the setgid bit set
2336 * but no group execute bit - an otherwise meaningless combination.
2339 static inline int __mandatory_lock(struct inode
*ino
)
2341 return (ino
->i_mode
& (S_ISGID
| S_IXGRP
)) == S_ISGID
;
2345 * ... and these candidates should be on SB_MANDLOCK mounted fs,
2346 * otherwise these will be advisory locks
2349 static inline int mandatory_lock(struct inode
*ino
)
2351 return IS_MANDLOCK(ino
) && __mandatory_lock(ino
);
2354 static inline int locks_verify_locked(struct file
*file
)
2356 if (mandatory_lock(locks_inode(file
)))
2357 return locks_mandatory_locked(file
);
2361 static inline int locks_verify_truncate(struct inode
*inode
,
2365 if (!inode
->i_flctx
|| !mandatory_lock(inode
))
2368 if (size
< inode
->i_size
) {
2369 return locks_mandatory_area(inode
, f
, size
, inode
->i_size
- 1,
2372 return locks_mandatory_area(inode
, f
, inode
->i_size
, size
- 1,
2377 #else /* !CONFIG_MANDATORY_FILE_LOCKING */
2379 static inline int locks_mandatory_locked(struct file
*file
)
2384 static inline int locks_mandatory_area(struct inode
*inode
, struct file
*filp
,
2385 loff_t start
, loff_t end
, unsigned char type
)
2390 static inline int __mandatory_lock(struct inode
*inode
)
2395 static inline int mandatory_lock(struct inode
*inode
)
2400 static inline int locks_verify_locked(struct file
*file
)
2405 static inline int locks_verify_truncate(struct inode
*inode
, struct file
*filp
,
2411 #endif /* CONFIG_MANDATORY_FILE_LOCKING */
2414 #ifdef CONFIG_FILE_LOCKING
2415 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2418 * Since this check is lockless, we must ensure that any refcounts
2419 * taken are done before checking i_flctx->flc_lease. Otherwise, we
2420 * could end up racing with tasks trying to set a new lease on this
2424 if (inode
->i_flctx
&& !list_empty_careful(&inode
->i_flctx
->flc_lease
))
2425 return __break_lease(inode
, mode
, FL_LEASE
);
2429 static inline int break_deleg(struct inode
*inode
, unsigned int mode
)
2432 * Since this check is lockless, we must ensure that any refcounts
2433 * taken are done before checking i_flctx->flc_lease. Otherwise, we
2434 * could end up racing with tasks trying to set a new lease on this
2438 if (inode
->i_flctx
&& !list_empty_careful(&inode
->i_flctx
->flc_lease
))
2439 return __break_lease(inode
, mode
, FL_DELEG
);
2443 static inline int try_break_deleg(struct inode
*inode
, struct inode
**delegated_inode
)
2447 ret
= break_deleg(inode
, O_WRONLY
|O_NONBLOCK
);
2448 if (ret
== -EWOULDBLOCK
&& delegated_inode
) {
2449 *delegated_inode
= inode
;
2455 static inline int break_deleg_wait(struct inode
**delegated_inode
)
2459 ret
= break_deleg(*delegated_inode
, O_WRONLY
);
2460 iput(*delegated_inode
);
2461 *delegated_inode
= NULL
;
2465 static inline int break_layout(struct inode
*inode
, bool wait
)
2468 if (inode
->i_flctx
&& !list_empty_careful(&inode
->i_flctx
->flc_lease
))
2469 return __break_lease(inode
,
2470 wait
? O_WRONLY
: O_WRONLY
| O_NONBLOCK
,
2475 #else /* !CONFIG_FILE_LOCKING */
2476 static inline int break_lease(struct inode
*inode
, unsigned int mode
)
2481 static inline int break_deleg(struct inode
*inode
, unsigned int mode
)
2486 static inline int try_break_deleg(struct inode
*inode
, struct inode
**delegated_inode
)
2491 static inline int break_deleg_wait(struct inode
**delegated_inode
)
2497 static inline int break_layout(struct inode
*inode
, bool wait
)
2502 #endif /* CONFIG_FILE_LOCKING */
2507 const char *name
; /* pointer to actual string */
2508 const __user
char *uptr
; /* original userland pointer */
2510 struct audit_names
*aname
;
2514 extern long vfs_truncate(const struct path
*, loff_t
);
2515 extern int do_truncate(struct dentry
*, loff_t start
, unsigned int time_attrs
,
2517 extern int vfs_fallocate(struct file
*file
, int mode
, loff_t offset
,
2519 extern long do_sys_open(int dfd
, const char __user
*filename
, int flags
,
2521 extern struct file
*file_open_name(struct filename
*, int, umode_t
);
2522 extern struct file
*filp_open(const char *, int, umode_t
);
2523 extern struct file
*file_open_root(struct dentry
*, struct vfsmount
*,
2524 const char *, int, umode_t
);
2525 extern struct file
* dentry_open(const struct path
*, int, const struct cred
*);
2526 extern struct file
* open_with_fake_path(const struct path
*, int,
2527 struct inode
*, const struct cred
*);
2528 static inline struct file
*file_clone_open(struct file
*file
)
2530 return dentry_open(&file
->f_path
, file
->f_flags
, file
->f_cred
);
2532 extern int filp_close(struct file
*, fl_owner_t id
);
2534 extern struct filename
*getname_flags(const char __user
*, int, int *);
2535 extern struct filename
*getname(const char __user
*);
2536 extern struct filename
*getname_kernel(const char *);
2537 extern void putname(struct filename
*name
);
2539 extern int finish_open(struct file
*file
, struct dentry
*dentry
,
2540 int (*open
)(struct inode
*, struct file
*));
2541 extern int finish_no_open(struct file
*file
, struct dentry
*dentry
);
2545 extern int ioctl_preallocate(struct file
*filp
, void __user
*argp
);
2548 extern void __init
vfs_caches_init_early(void);
2549 extern void __init
vfs_caches_init(void);
2551 extern struct kmem_cache
*names_cachep
;
2553 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
2554 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2557 extern int register_blkdev(unsigned int, const char *);
2558 extern void unregister_blkdev(unsigned int, const char *);
2559 extern void bdev_unhash_inode(dev_t dev
);
2560 extern struct block_device
*bdget(dev_t
);
2561 extern struct block_device
*bdgrab(struct block_device
*bdev
);
2562 extern void bd_set_size(struct block_device
*, loff_t size
);
2563 extern void bd_forget(struct inode
*inode
);
2564 extern void bdput(struct block_device
*);
2565 extern void invalidate_bdev(struct block_device
*);
2566 extern void iterate_bdevs(void (*)(struct block_device
*, void *), void *);
2567 extern int sync_blockdev(struct block_device
*bdev
);
2568 extern void kill_bdev(struct block_device
*);
2569 extern struct super_block
*freeze_bdev(struct block_device
*);
2570 extern void emergency_thaw_all(void);
2571 extern void emergency_thaw_bdev(struct super_block
*sb
);
2572 extern int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
);
2573 extern int fsync_bdev(struct block_device
*);
2575 extern struct super_block
*blockdev_superblock
;
2577 static inline bool sb_is_blkdev_sb(struct super_block
*sb
)
2579 return sb
== blockdev_superblock
;
2582 static inline void bd_forget(struct inode
*inode
) {}
2583 static inline int sync_blockdev(struct block_device
*bdev
) { return 0; }
2584 static inline void kill_bdev(struct block_device
*bdev
) {}
2585 static inline void invalidate_bdev(struct block_device
*bdev
) {}
2587 static inline struct super_block
*freeze_bdev(struct block_device
*sb
)
2592 static inline int thaw_bdev(struct block_device
*bdev
, struct super_block
*sb
)
2597 static inline int emergency_thaw_bdev(struct super_block
*sb
)
2602 static inline void iterate_bdevs(void (*f
)(struct block_device
*, void *), void *arg
)
2606 static inline bool sb_is_blkdev_sb(struct super_block
*sb
)
2611 extern int __sync_filesystem(struct super_block
*, int);
2612 extern int sync_filesystem(struct super_block
*);
2613 extern const struct file_operations def_blk_fops
;
2614 extern const struct file_operations def_chr_fops
;
2616 extern int ioctl_by_bdev(struct block_device
*, unsigned, unsigned long);
2617 extern int blkdev_ioctl(struct block_device
*, fmode_t
, unsigned, unsigned long);
2618 extern long compat_blkdev_ioctl(struct file
*, unsigned, unsigned long);
2619 extern int blkdev_get(struct block_device
*bdev
, fmode_t mode
, void *holder
);
2620 extern struct block_device
*blkdev_get_by_path(const char *path
, fmode_t mode
,
2622 extern struct block_device
*blkdev_get_by_dev(dev_t dev
, fmode_t mode
,
2624 extern void blkdev_put(struct block_device
*bdev
, fmode_t mode
);
2625 extern int __blkdev_reread_part(struct block_device
*bdev
);
2626 extern int blkdev_reread_part(struct block_device
*bdev
);
2629 extern int bd_link_disk_holder(struct block_device
*bdev
, struct gendisk
*disk
);
2630 extern void bd_unlink_disk_holder(struct block_device
*bdev
,
2631 struct gendisk
*disk
);
2633 static inline int bd_link_disk_holder(struct block_device
*bdev
,
2634 struct gendisk
*disk
)
2638 static inline void bd_unlink_disk_holder(struct block_device
*bdev
,
2639 struct gendisk
*disk
)
2646 #define CHRDEV_MAJOR_MAX 512
2647 /* Marks the bottom of the first segment of free char majors */
2648 #define CHRDEV_MAJOR_DYN_END 234
2649 /* Marks the top and bottom of the second segment of free char majors */
2650 #define CHRDEV_MAJOR_DYN_EXT_START 511
2651 #define CHRDEV_MAJOR_DYN_EXT_END 384
2653 extern int alloc_chrdev_region(dev_t
*, unsigned, unsigned, const char *);
2654 extern int register_chrdev_region(dev_t
, unsigned, const char *);
2655 extern int __register_chrdev(unsigned int major
, unsigned int baseminor
,
2656 unsigned int count
, const char *name
,
2657 const struct file_operations
*fops
);
2658 extern void __unregister_chrdev(unsigned int major
, unsigned int baseminor
,
2659 unsigned int count
, const char *name
);
2660 extern void unregister_chrdev_region(dev_t
, unsigned);
2661 extern void chrdev_show(struct seq_file
*,off_t
);
2663 static inline int register_chrdev(unsigned int major
, const char *name
,
2664 const struct file_operations
*fops
)
2666 return __register_chrdev(major
, 0, 256, name
, fops
);
2669 static inline void unregister_chrdev(unsigned int major
, const char *name
)
2671 __unregister_chrdev(major
, 0, 256, name
);
2674 /* fs/block_dev.c */
2675 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2676 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2679 #define BLKDEV_MAJOR_MAX 512
2680 extern const char *__bdevname(dev_t
, char *buffer
);
2681 extern const char *bdevname(struct block_device
*bdev
, char *buffer
);
2682 extern struct block_device
*lookup_bdev(const char *, int mask
);
2683 extern void blkdev_show(struct seq_file
*,off_t
);
2686 #define BLKDEV_MAJOR_MAX 0
2689 extern void init_special_inode(struct inode
*, umode_t
, dev_t
);
2691 /* Invalid inode operations -- fs/bad_inode.c */
2692 extern void make_bad_inode(struct inode
*);
2693 extern bool is_bad_inode(struct inode
*);
2696 extern void check_disk_size_change(struct gendisk
*disk
,
2697 struct block_device
*bdev
, bool verbose
);
2698 extern int revalidate_disk(struct gendisk
*);
2699 extern int check_disk_change(struct block_device
*);
2700 extern int __invalidate_device(struct block_device
*, bool);
2701 extern int invalidate_partition(struct gendisk
*, int);
2703 unsigned long invalidate_mapping_pages(struct address_space
*mapping
,
2704 pgoff_t start
, pgoff_t end
);
2706 static inline void invalidate_remote_inode(struct inode
*inode
)
2708 if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
2709 S_ISLNK(inode
->i_mode
))
2710 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
2712 extern int invalidate_inode_pages2(struct address_space
*mapping
);
2713 extern int invalidate_inode_pages2_range(struct address_space
*mapping
,
2714 pgoff_t start
, pgoff_t end
);
2715 extern int write_inode_now(struct inode
*, int);
2716 extern int filemap_fdatawrite(struct address_space
*);
2717 extern int filemap_flush(struct address_space
*);
2718 extern int filemap_fdatawait_keep_errors(struct address_space
*mapping
);
2719 extern int filemap_fdatawait_range(struct address_space
*, loff_t lstart
,
2722 static inline int filemap_fdatawait(struct address_space
*mapping
)
2724 return filemap_fdatawait_range(mapping
, 0, LLONG_MAX
);
2727 extern bool filemap_range_has_page(struct address_space
*, loff_t lstart
,
2729 extern int filemap_write_and_wait(struct address_space
*mapping
);
2730 extern int filemap_write_and_wait_range(struct address_space
*mapping
,
2731 loff_t lstart
, loff_t lend
);
2732 extern int __filemap_fdatawrite_range(struct address_space
*mapping
,
2733 loff_t start
, loff_t end
, int sync_mode
);
2734 extern int filemap_fdatawrite_range(struct address_space
*mapping
,
2735 loff_t start
, loff_t end
);
2736 extern int filemap_check_errors(struct address_space
*mapping
);
2737 extern void __filemap_set_wb_err(struct address_space
*mapping
, int err
);
2739 extern int __must_check
file_fdatawait_range(struct file
*file
, loff_t lstart
,
2741 extern int __must_check
file_check_and_advance_wb_err(struct file
*file
);
2742 extern int __must_check
file_write_and_wait_range(struct file
*file
,
2743 loff_t start
, loff_t end
);
2745 static inline int file_write_and_wait(struct file
*file
)
2747 return file_write_and_wait_range(file
, 0, LLONG_MAX
);
2751 * filemap_set_wb_err - set a writeback error on an address_space
2752 * @mapping: mapping in which to set writeback error
2753 * @err: error to be set in mapping
2755 * When writeback fails in some way, we must record that error so that
2756 * userspace can be informed when fsync and the like are called. We endeavor
2757 * to report errors on any file that was open at the time of the error. Some
2758 * internal callers also need to know when writeback errors have occurred.
2760 * When a writeback error occurs, most filesystems will want to call
2761 * filemap_set_wb_err to record the error in the mapping so that it will be
2762 * automatically reported whenever fsync is called on the file.
2764 static inline void filemap_set_wb_err(struct address_space
*mapping
, int err
)
2766 /* Fastpath for common case of no error */
2768 __filemap_set_wb_err(mapping
, err
);
2772 * filemap_check_wb_error - has an error occurred since the mark was sampled?
2773 * @mapping: mapping to check for writeback errors
2774 * @since: previously-sampled errseq_t
2776 * Grab the errseq_t value from the mapping, and see if it has changed "since"
2777 * the given value was sampled.
2779 * If it has then report the latest error set, otherwise return 0.
2781 static inline int filemap_check_wb_err(struct address_space
*mapping
,
2784 return errseq_check(&mapping
->wb_err
, since
);
2788 * filemap_sample_wb_err - sample the current errseq_t to test for later errors
2789 * @mapping: mapping to be sampled
2791 * Writeback errors are always reported relative to a particular sample point
2792 * in the past. This function provides those sample points.
2794 static inline errseq_t
filemap_sample_wb_err(struct address_space
*mapping
)
2796 return errseq_sample(&mapping
->wb_err
);
2799 extern int vfs_fsync_range(struct file
*file
, loff_t start
, loff_t end
,
2801 extern int vfs_fsync(struct file
*file
, int datasync
);
2804 * Sync the bytes written if this was a synchronous write. Expect ki_pos
2805 * to already be updated for the write, and will return either the amount
2806 * of bytes passed in, or an error if syncing the file failed.
2808 static inline ssize_t
generic_write_sync(struct kiocb
*iocb
, ssize_t count
)
2810 if (iocb
->ki_flags
& IOCB_DSYNC
) {
2811 int ret
= vfs_fsync_range(iocb
->ki_filp
,
2812 iocb
->ki_pos
- count
, iocb
->ki_pos
- 1,
2813 (iocb
->ki_flags
& IOCB_SYNC
) ? 0 : 1);
2821 extern void emergency_sync(void);
2822 extern void emergency_remount(void);
2824 extern sector_t
bmap(struct inode
*, sector_t
);
2826 extern int notify_change(struct dentry
*, struct iattr
*, struct inode
**);
2827 extern int inode_permission(struct inode
*, int);
2828 extern int generic_permission(struct inode
*, int);
2829 extern int __check_sticky(struct inode
*dir
, struct inode
*inode
);
2831 static inline bool execute_ok(struct inode
*inode
)
2833 return (inode
->i_mode
& S_IXUGO
) || S_ISDIR(inode
->i_mode
);
2836 static inline void file_start_write(struct file
*file
)
2838 if (!S_ISREG(file_inode(file
)->i_mode
))
2840 __sb_start_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
, true);
2843 static inline bool file_start_write_trylock(struct file
*file
)
2845 if (!S_ISREG(file_inode(file
)->i_mode
))
2847 return __sb_start_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
, false);
2850 static inline void file_end_write(struct file
*file
)
2852 if (!S_ISREG(file_inode(file
)->i_mode
))
2854 __sb_end_write(file_inode(file
)->i_sb
, SB_FREEZE_WRITE
);
2858 * get_write_access() gets write permission for a file.
2859 * put_write_access() releases this write permission.
2860 * This is used for regular files.
2861 * We cannot support write (and maybe mmap read-write shared) accesses and
2862 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2863 * can have the following values:
2864 * 0: no writers, no VM_DENYWRITE mappings
2865 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2866 * > 0: (i_writecount) users are writing to the file.
2868 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2869 * except for the cases where we don't hold i_writecount yet. Then we need to
2870 * use {get,deny}_write_access() - these functions check the sign and refuse
2871 * to do the change if sign is wrong.
2873 static inline int get_write_access(struct inode
*inode
)
2875 return atomic_inc_unless_negative(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2877 static inline int deny_write_access(struct file
*file
)
2879 struct inode
*inode
= file_inode(file
);
2880 return atomic_dec_unless_positive(&inode
->i_writecount
) ? 0 : -ETXTBSY
;
2882 static inline void put_write_access(struct inode
* inode
)
2884 atomic_dec(&inode
->i_writecount
);
2886 static inline void allow_write_access(struct file
*file
)
2889 atomic_inc(&file_inode(file
)->i_writecount
);
2891 static inline bool inode_is_open_for_write(const struct inode
*inode
)
2893 return atomic_read(&inode
->i_writecount
) > 0;
2897 static inline void i_readcount_dec(struct inode
*inode
)
2899 BUG_ON(!atomic_read(&inode
->i_readcount
));
2900 atomic_dec(&inode
->i_readcount
);
2902 static inline void i_readcount_inc(struct inode
*inode
)
2904 atomic_inc(&inode
->i_readcount
);
2907 static inline void i_readcount_dec(struct inode
*inode
)
2911 static inline void i_readcount_inc(struct inode
*inode
)
2916 extern int do_pipe_flags(int *, int);
2918 #define __kernel_read_file_id(id) \
2919 id(UNKNOWN, unknown) \
2920 id(FIRMWARE, firmware) \
2921 id(FIRMWARE_PREALLOC_BUFFER, firmware) \
2922 id(MODULE, kernel-module) \
2923 id(KEXEC_IMAGE, kexec-image) \
2924 id(KEXEC_INITRAMFS, kexec-initramfs) \
2925 id(POLICY, security-policy) \
2926 id(X509_CERTIFICATE, x509-certificate) \
2929 #define __fid_enumify(ENUM, dummy) READING_ ## ENUM,
2930 #define __fid_stringify(dummy, str) #str,
2932 enum kernel_read_file_id
{
2933 __kernel_read_file_id(__fid_enumify
)
2936 static const char * const kernel_read_file_str
[] = {
2937 __kernel_read_file_id(__fid_stringify
)
2940 static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id
)
2942 if ((unsigned)id
>= READING_MAX_ID
)
2943 return kernel_read_file_str
[READING_UNKNOWN
];
2945 return kernel_read_file_str
[id
];
2948 extern int kernel_read_file(struct file
*, void **, loff_t
*, loff_t
,
2949 enum kernel_read_file_id
);
2950 extern int kernel_read_file_from_path(const char *, void **, loff_t
*, loff_t
,
2951 enum kernel_read_file_id
);
2952 extern int kernel_read_file_from_fd(int, void **, loff_t
*, loff_t
,
2953 enum kernel_read_file_id
);
2954 extern ssize_t
kernel_read(struct file
*, void *, size_t, loff_t
*);
2955 extern ssize_t
kernel_write(struct file
*, const void *, size_t, loff_t
*);
2956 extern ssize_t
__kernel_write(struct file
*, const void *, size_t, loff_t
*);
2957 extern struct file
* open_exec(const char *);
2959 /* fs/dcache.c -- generic fs support functions */
2960 extern bool is_subdir(struct dentry
*, struct dentry
*);
2961 extern bool path_is_under(const struct path
*, const struct path
*);
2963 extern char *file_path(struct file
*, char *, int);
2965 #include <linux/err.h>
2967 /* needed for stackable file system support */
2968 extern loff_t
default_llseek(struct file
*file
, loff_t offset
, int whence
);
2970 extern loff_t
vfs_llseek(struct file
*file
, loff_t offset
, int whence
);
2972 extern int inode_init_always(struct super_block
*, struct inode
*);
2973 extern void inode_init_once(struct inode
*);
2974 extern void address_space_init_once(struct address_space
*mapping
);
2975 extern struct inode
* igrab(struct inode
*);
2976 extern ino_t
iunique(struct super_block
*, ino_t
);
2977 extern int inode_needs_sync(struct inode
*inode
);
2978 extern int generic_delete_inode(struct inode
*inode
);
2979 static inline int generic_drop_inode(struct inode
*inode
)
2981 return !inode
->i_nlink
|| inode_unhashed(inode
);
2984 extern struct inode
*ilookup5_nowait(struct super_block
*sb
,
2985 unsigned long hashval
, int (*test
)(struct inode
*, void *),
2987 extern struct inode
*ilookup5(struct super_block
*sb
, unsigned long hashval
,
2988 int (*test
)(struct inode
*, void *), void *data
);
2989 extern struct inode
*ilookup(struct super_block
*sb
, unsigned long ino
);
2991 extern struct inode
*inode_insert5(struct inode
*inode
, unsigned long hashval
,
2992 int (*test
)(struct inode
*, void *),
2993 int (*set
)(struct inode
*, void *),
2995 extern struct inode
* iget5_locked(struct super_block
*, unsigned long, int (*test
)(struct inode
*, void *), int (*set
)(struct inode
*, void *), void *);
2996 extern struct inode
* iget_locked(struct super_block
*, unsigned long);
2997 extern struct inode
*find_inode_nowait(struct super_block
*,
2999 int (*match
)(struct inode
*,
3000 unsigned long, void *),
3002 extern int insert_inode_locked4(struct inode
*, unsigned long, int (*test
)(struct inode
*, void *), void *);
3003 extern int insert_inode_locked(struct inode
*);
3004 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3005 extern void lockdep_annotate_inode_mutex_key(struct inode
*inode
);
3007 static inline void lockdep_annotate_inode_mutex_key(struct inode
*inode
) { };
3009 extern void unlock_new_inode(struct inode
*);
3010 extern void discard_new_inode(struct inode
*);
3011 extern unsigned int get_next_ino(void);
3012 extern void evict_inodes(struct super_block
*sb
);
3014 extern void __iget(struct inode
* inode
);
3015 extern void iget_failed(struct inode
*);
3016 extern void clear_inode(struct inode
*);
3017 extern void __destroy_inode(struct inode
*);
3018 extern struct inode
*new_inode_pseudo(struct super_block
*sb
);
3019 extern struct inode
*new_inode(struct super_block
*sb
);
3020 extern void free_inode_nonrcu(struct inode
*inode
);
3021 extern int should_remove_suid(struct dentry
*);
3022 extern int file_remove_privs(struct file
*);
3024 extern void __insert_inode_hash(struct inode
*, unsigned long hashval
);
3025 static inline void insert_inode_hash(struct inode
*inode
)
3027 __insert_inode_hash(inode
, inode
->i_ino
);
3030 extern void __remove_inode_hash(struct inode
*);
3031 static inline void remove_inode_hash(struct inode
*inode
)
3033 if (!inode_unhashed(inode
) && !hlist_fake(&inode
->i_hash
))
3034 __remove_inode_hash(inode
);
3037 extern void inode_sb_list_add(struct inode
*inode
);
3040 extern int bdev_read_only(struct block_device
*);
3042 extern int set_blocksize(struct block_device
*, int);
3043 extern int sb_set_blocksize(struct super_block
*, int);
3044 extern int sb_min_blocksize(struct super_block
*, int);
3046 extern int generic_file_mmap(struct file
*, struct vm_area_struct
*);
3047 extern int generic_file_readonly_mmap(struct file
*, struct vm_area_struct
*);
3048 extern ssize_t
generic_write_checks(struct kiocb
*, struct iov_iter
*);
3049 extern int generic_remap_checks(struct file
*file_in
, loff_t pos_in
,
3050 struct file
*file_out
, loff_t pos_out
,
3051 loff_t
*count
, unsigned int remap_flags
);
3052 extern ssize_t
generic_file_read_iter(struct kiocb
*, struct iov_iter
*);
3053 extern ssize_t
__generic_file_write_iter(struct kiocb
*, struct iov_iter
*);
3054 extern ssize_t
generic_file_write_iter(struct kiocb
*, struct iov_iter
*);
3055 extern ssize_t
generic_file_direct_write(struct kiocb
*, struct iov_iter
*);
3056 extern ssize_t
generic_perform_write(struct file
*, struct iov_iter
*, loff_t
);
3058 ssize_t
vfs_iter_read(struct file
*file
, struct iov_iter
*iter
, loff_t
*ppos
,
3060 ssize_t
vfs_iter_write(struct file
*file
, struct iov_iter
*iter
, loff_t
*ppos
,
3063 /* fs/block_dev.c */
3064 extern ssize_t
blkdev_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
);
3065 extern ssize_t
blkdev_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
);
3066 extern int blkdev_fsync(struct file
*filp
, loff_t start
, loff_t end
,
3068 extern void block_sync_page(struct page
*page
);
3071 extern ssize_t
generic_file_splice_read(struct file
*, loff_t
*,
3072 struct pipe_inode_info
*, size_t, unsigned int);
3073 extern ssize_t
iter_file_splice_write(struct pipe_inode_info
*,
3074 struct file
*, loff_t
*, size_t, unsigned int);
3075 extern ssize_t
generic_splice_sendpage(struct pipe_inode_info
*pipe
,
3076 struct file
*out
, loff_t
*, size_t len
, unsigned int flags
);
3077 extern long do_splice_direct(struct file
*in
, loff_t
*ppos
, struct file
*out
,
3078 loff_t
*opos
, size_t len
, unsigned int flags
);
3082 file_ra_state_init(struct file_ra_state
*ra
, struct address_space
*mapping
);
3083 extern loff_t
noop_llseek(struct file
*file
, loff_t offset
, int whence
);
3084 extern loff_t
no_llseek(struct file
*file
, loff_t offset
, int whence
);
3085 extern loff_t
vfs_setpos(struct file
*file
, loff_t offset
, loff_t maxsize
);
3086 extern loff_t
generic_file_llseek(struct file
*file
, loff_t offset
, int whence
);
3087 extern loff_t
generic_file_llseek_size(struct file
*file
, loff_t offset
,
3088 int whence
, loff_t maxsize
, loff_t eof
);
3089 extern loff_t
fixed_size_llseek(struct file
*file
, loff_t offset
,
3090 int whence
, loff_t size
);
3091 extern loff_t
no_seek_end_llseek_size(struct file
*, loff_t
, int, loff_t
);
3092 extern loff_t
no_seek_end_llseek(struct file
*, loff_t
, int);
3093 extern int generic_file_open(struct inode
* inode
, struct file
* filp
);
3094 extern int nonseekable_open(struct inode
* inode
, struct file
* filp
);
3095 extern int stream_open(struct inode
* inode
, struct file
* filp
);
3098 typedef void (dio_submit_t
)(struct bio
*bio
, struct inode
*inode
,
3099 loff_t file_offset
);
3102 /* need locking between buffered and direct access */
3105 /* filesystem does not support filling holes */
3106 DIO_SKIP_HOLES
= 0x02,
3109 void dio_end_io(struct bio
*bio
);
3110 void dio_warn_stale_pagecache(struct file
*filp
);
3112 ssize_t
__blockdev_direct_IO(struct kiocb
*iocb
, struct inode
*inode
,
3113 struct block_device
*bdev
, struct iov_iter
*iter
,
3114 get_block_t get_block
,
3115 dio_iodone_t end_io
, dio_submit_t submit_io
,
3118 static inline ssize_t
blockdev_direct_IO(struct kiocb
*iocb
,
3119 struct inode
*inode
,
3120 struct iov_iter
*iter
,
3121 get_block_t get_block
)
3123 return __blockdev_direct_IO(iocb
, inode
, inode
->i_sb
->s_bdev
, iter
,
3124 get_block
, NULL
, NULL
, DIO_LOCKING
| DIO_SKIP_HOLES
);
3128 void inode_dio_wait(struct inode
*inode
);
3131 * inode_dio_begin - signal start of a direct I/O requests
3132 * @inode: inode the direct I/O happens on
3134 * This is called once we've finished processing a direct I/O request,
3135 * and is used to wake up callers waiting for direct I/O to be quiesced.
3137 static inline void inode_dio_begin(struct inode
*inode
)
3139 atomic_inc(&inode
->i_dio_count
);
3143 * inode_dio_end - signal finish of a direct I/O requests
3144 * @inode: inode the direct I/O happens on
3146 * This is called once we've finished processing a direct I/O request,
3147 * and is used to wake up callers waiting for direct I/O to be quiesced.
3149 static inline void inode_dio_end(struct inode
*inode
)
3151 if (atomic_dec_and_test(&inode
->i_dio_count
))
3152 wake_up_bit(&inode
->i_state
, __I_DIO_WAKEUP
);
3155 extern void inode_set_flags(struct inode
*inode
, unsigned int flags
,
3158 extern const struct file_operations generic_ro_fops
;
3160 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
3162 extern int readlink_copy(char __user
*, int, const char *);
3163 extern int page_readlink(struct dentry
*, char __user
*, int);
3164 extern const char *page_get_link(struct dentry
*, struct inode
*,
3165 struct delayed_call
*);
3166 extern void page_put_link(void *);
3167 extern int __page_symlink(struct inode
*inode
, const char *symname
, int len
,
3169 extern int page_symlink(struct inode
*inode
, const char *symname
, int len
);
3170 extern const struct inode_operations page_symlink_inode_operations
;
3171 extern void kfree_link(void *);
3172 extern void generic_fillattr(struct inode
*, struct kstat
*);
3173 extern int vfs_getattr_nosec(const struct path
*, struct kstat
*, u32
, unsigned int);
3174 extern int vfs_getattr(const struct path
*, struct kstat
*, u32
, unsigned int);
3175 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
);
3176 void inode_add_bytes(struct inode
*inode
, loff_t bytes
);
3177 void __inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
3178 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
);
3179 static inline loff_t
__inode_get_bytes(struct inode
*inode
)
3181 return (((loff_t
)inode
->i_blocks
) << 9) + inode
->i_bytes
;
3183 loff_t
inode_get_bytes(struct inode
*inode
);
3184 void inode_set_bytes(struct inode
*inode
, loff_t bytes
);
3185 const char *simple_get_link(struct dentry
*, struct inode
*,
3186 struct delayed_call
*);
3187 extern const struct inode_operations simple_symlink_inode_operations
;
3189 extern int iterate_dir(struct file
*, struct dir_context
*);
3191 extern int vfs_statx(int, const char __user
*, int, struct kstat
*, u32
);
3192 extern int vfs_statx_fd(unsigned int, struct kstat
*, u32
, unsigned int);
3194 static inline int vfs_stat(const char __user
*filename
, struct kstat
*stat
)
3196 return vfs_statx(AT_FDCWD
, filename
, AT_NO_AUTOMOUNT
,
3197 stat
, STATX_BASIC_STATS
);
3199 static inline int vfs_lstat(const char __user
*name
, struct kstat
*stat
)
3201 return vfs_statx(AT_FDCWD
, name
, AT_SYMLINK_NOFOLLOW
| AT_NO_AUTOMOUNT
,
3202 stat
, STATX_BASIC_STATS
);
3204 static inline int vfs_fstatat(int dfd
, const char __user
*filename
,
3205 struct kstat
*stat
, int flags
)
3207 return vfs_statx(dfd
, filename
, flags
| AT_NO_AUTOMOUNT
,
3208 stat
, STATX_BASIC_STATS
);
3210 static inline int vfs_fstat(int fd
, struct kstat
*stat
)
3212 return vfs_statx_fd(fd
, stat
, STATX_BASIC_STATS
, 0);
3216 extern const char *vfs_get_link(struct dentry
*, struct delayed_call
*);
3217 extern int vfs_readlink(struct dentry
*, char __user
*, int);
3219 extern int __generic_block_fiemap(struct inode
*inode
,
3220 struct fiemap_extent_info
*fieinfo
,
3221 loff_t start
, loff_t len
,
3222 get_block_t
*get_block
);
3223 extern int generic_block_fiemap(struct inode
*inode
,
3224 struct fiemap_extent_info
*fieinfo
, u64 start
,
3225 u64 len
, get_block_t
*get_block
);
3227 extern struct file_system_type
*get_filesystem(struct file_system_type
*fs
);
3228 extern void put_filesystem(struct file_system_type
*fs
);
3229 extern struct file_system_type
*get_fs_type(const char *name
);
3230 extern struct super_block
*get_super(struct block_device
*);
3231 extern struct super_block
*get_super_thawed(struct block_device
*);
3232 extern struct super_block
*get_super_exclusive_thawed(struct block_device
*bdev
);
3233 extern struct super_block
*get_active_super(struct block_device
*bdev
);
3234 extern void drop_super(struct super_block
*sb
);
3235 extern void drop_super_exclusive(struct super_block
*sb
);
3236 extern void iterate_supers(void (*)(struct super_block
*, void *), void *);
3237 extern void iterate_supers_type(struct file_system_type
*,
3238 void (*)(struct super_block
*, void *), void *);
3240 extern int dcache_dir_open(struct inode
*, struct file
*);
3241 extern int dcache_dir_close(struct inode
*, struct file
*);
3242 extern loff_t
dcache_dir_lseek(struct file
*, loff_t
, int);
3243 extern int dcache_readdir(struct file
*, struct dir_context
*);
3244 extern int simple_setattr(struct dentry
*, struct iattr
*);
3245 extern int simple_getattr(const struct path
*, struct kstat
*, u32
, unsigned int);
3246 extern int simple_statfs(struct dentry
*, struct kstatfs
*);
3247 extern int simple_open(struct inode
*inode
, struct file
*file
);
3248 extern int simple_link(struct dentry
*, struct inode
*, struct dentry
*);
3249 extern int simple_unlink(struct inode
*, struct dentry
*);
3250 extern int simple_rmdir(struct inode
*, struct dentry
*);
3251 extern int simple_rename(struct inode
*, struct dentry
*,
3252 struct inode
*, struct dentry
*, unsigned int);
3253 extern int noop_fsync(struct file
*, loff_t
, loff_t
, int);
3254 extern int noop_set_page_dirty(struct page
*page
);
3255 extern void noop_invalidatepage(struct page
*page
, unsigned int offset
,
3256 unsigned int length
);
3257 extern ssize_t
noop_direct_IO(struct kiocb
*iocb
, struct iov_iter
*iter
);
3258 extern int simple_empty(struct dentry
*);
3259 extern int simple_readpage(struct file
*file
, struct page
*page
);
3260 extern int simple_write_begin(struct file
*file
, struct address_space
*mapping
,
3261 loff_t pos
, unsigned len
, unsigned flags
,
3262 struct page
**pagep
, void **fsdata
);
3263 extern int simple_write_end(struct file
*file
, struct address_space
*mapping
,
3264 loff_t pos
, unsigned len
, unsigned copied
,
3265 struct page
*page
, void *fsdata
);
3266 extern int always_delete_dentry(const struct dentry
*);
3267 extern struct inode
*alloc_anon_inode(struct super_block
*);
3268 extern int simple_nosetlease(struct file
*, long, struct file_lock
**, void **);
3269 extern const struct dentry_operations simple_dentry_operations
;
3271 extern struct dentry
*simple_lookup(struct inode
*, struct dentry
*, unsigned int flags
);
3272 extern ssize_t
generic_read_dir(struct file
*, char __user
*, size_t, loff_t
*);
3273 extern const struct file_operations simple_dir_operations
;
3274 extern const struct inode_operations simple_dir_inode_operations
;
3275 extern void make_empty_dir_inode(struct inode
*inode
);
3276 extern bool is_empty_dir_inode(struct inode
*inode
);
3277 struct tree_descr
{ const char *name
; const struct file_operations
*ops
; int mode
; };
3278 struct dentry
*d_alloc_name(struct dentry
*, const char *);
3279 extern int simple_fill_super(struct super_block
*, unsigned long,
3280 const struct tree_descr
*);
3281 extern int simple_pin_fs(struct file_system_type
*, struct vfsmount
**mount
, int *count
);
3282 extern void simple_release_fs(struct vfsmount
**mount
, int *count
);
3284 extern ssize_t
simple_read_from_buffer(void __user
*to
, size_t count
,
3285 loff_t
*ppos
, const void *from
, size_t available
);
3286 extern ssize_t
simple_write_to_buffer(void *to
, size_t available
, loff_t
*ppos
,
3287 const void __user
*from
, size_t count
);
3289 extern int __generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
3290 extern int generic_file_fsync(struct file
*, loff_t
, loff_t
, int);
3292 extern int generic_check_addressable(unsigned, u64
);
3294 #ifdef CONFIG_MIGRATION
3295 extern int buffer_migrate_page(struct address_space
*,
3296 struct page
*, struct page
*,
3298 extern int buffer_migrate_page_norefs(struct address_space
*,
3299 struct page
*, struct page
*,
3302 #define buffer_migrate_page NULL
3303 #define buffer_migrate_page_norefs NULL
3306 extern int setattr_prepare(struct dentry
*, struct iattr
*);
3307 extern int inode_newsize_ok(const struct inode
*, loff_t offset
);
3308 extern void setattr_copy(struct inode
*inode
, const struct iattr
*attr
);
3310 extern int file_update_time(struct file
*file
);
3312 static inline bool io_is_direct(struct file
*filp
)
3314 return (filp
->f_flags
& O_DIRECT
) || IS_DAX(filp
->f_mapping
->host
);
3317 static inline bool vma_is_dax(struct vm_area_struct
*vma
)
3319 return vma
->vm_file
&& IS_DAX(vma
->vm_file
->f_mapping
->host
);
3322 static inline bool vma_is_fsdax(struct vm_area_struct
*vma
)
3324 struct inode
*inode
;
3328 if (!vma_is_dax(vma
))
3330 inode
= file_inode(vma
->vm_file
);
3331 if (S_ISCHR(inode
->i_mode
))
3332 return false; /* device-dax */
3336 static inline int iocb_flags(struct file
*file
)
3339 if (file
->f_flags
& O_APPEND
)
3341 if (io_is_direct(file
))
3343 if ((file
->f_flags
& O_DSYNC
) || IS_SYNC(file
->f_mapping
->host
))
3345 if (file
->f_flags
& __O_SYNC
)
3350 static inline int kiocb_set_rw_flags(struct kiocb
*ki
, rwf_t flags
)
3352 if (unlikely(flags
& ~RWF_SUPPORTED
))
3355 if (flags
& RWF_NOWAIT
) {
3356 if (!(ki
->ki_filp
->f_mode
& FMODE_NOWAIT
))
3358 ki
->ki_flags
|= IOCB_NOWAIT
;
3360 if (flags
& RWF_HIPRI
)
3361 ki
->ki_flags
|= IOCB_HIPRI
;
3362 if (flags
& RWF_DSYNC
)
3363 ki
->ki_flags
|= IOCB_DSYNC
;
3364 if (flags
& RWF_SYNC
)
3365 ki
->ki_flags
|= (IOCB_DSYNC
| IOCB_SYNC
);
3366 if (flags
& RWF_APPEND
)
3367 ki
->ki_flags
|= IOCB_APPEND
;
3371 static inline ino_t
parent_ino(struct dentry
*dentry
)
3376 * Don't strictly need d_lock here? If the parent ino could change
3377 * then surely we'd have a deeper race in the caller?
3379 spin_lock(&dentry
->d_lock
);
3380 res
= dentry
->d_parent
->d_inode
->i_ino
;
3381 spin_unlock(&dentry
->d_lock
);
3385 /* Transaction based IO helpers */
3388 * An argresp is stored in an allocated page and holds the
3389 * size of the argument or response, along with its content
3391 struct simple_transaction_argresp
{
3396 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
3398 char *simple_transaction_get(struct file
*file
, const char __user
*buf
,
3400 ssize_t
simple_transaction_read(struct file
*file
, char __user
*buf
,
3401 size_t size
, loff_t
*pos
);
3402 int simple_transaction_release(struct inode
*inode
, struct file
*file
);
3404 void simple_transaction_set(struct file
*file
, size_t n
);
3407 * simple attribute files
3409 * These attributes behave similar to those in sysfs:
3411 * Writing to an attribute immediately sets a value, an open file can be
3412 * written to multiple times.
3414 * Reading from an attribute creates a buffer from the value that might get
3415 * read with multiple read calls. When the attribute has been read
3416 * completely, no further read calls are possible until the file is opened
3419 * All attributes contain a text representation of a numeric value
3420 * that are accessed with the get() and set() functions.
3422 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
3423 static int __fops ## _open(struct inode *inode, struct file *file) \
3425 __simple_attr_check_format(__fmt, 0ull); \
3426 return simple_attr_open(inode, file, __get, __set, __fmt); \
3428 static const struct file_operations __fops = { \
3429 .owner = THIS_MODULE, \
3430 .open = __fops ## _open, \
3431 .release = simple_attr_release, \
3432 .read = simple_attr_read, \
3433 .write = simple_attr_write, \
3434 .llseek = generic_file_llseek, \
3437 static inline __printf(1, 2)
3438 void __simple_attr_check_format(const char *fmt
, ...)
3440 /* don't do anything, just let the compiler check the arguments; */
3443 int simple_attr_open(struct inode
*inode
, struct file
*file
,
3444 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
3446 int simple_attr_release(struct inode
*inode
, struct file
*file
);
3447 ssize_t
simple_attr_read(struct file
*file
, char __user
*buf
,
3448 size_t len
, loff_t
*ppos
);
3449 ssize_t
simple_attr_write(struct file
*file
, const char __user
*buf
,
3450 size_t len
, loff_t
*ppos
);
3453 int proc_nr_files(struct ctl_table
*table
, int write
,
3454 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
3455 int proc_nr_dentry(struct ctl_table
*table
, int write
,
3456 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
3457 int proc_nr_inodes(struct ctl_table
*table
, int write
,
3458 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
3459 int __init
get_filesystem_list(char *buf
);
3461 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
3462 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
3464 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
3465 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
3466 (flag & __FMODE_NONOTIFY)))
3468 static inline bool is_sxid(umode_t mode
)
3470 return (mode
& S_ISUID
) || ((mode
& S_ISGID
) && (mode
& S_IXGRP
));
3473 static inline int check_sticky(struct inode
*dir
, struct inode
*inode
)
3475 if (!(dir
->i_mode
& S_ISVTX
))
3478 return __check_sticky(dir
, inode
);
3481 static inline void inode_has_no_xattr(struct inode
*inode
)
3483 if (!is_sxid(inode
->i_mode
) && (inode
->i_sb
->s_flags
& SB_NOSEC
))
3484 inode
->i_flags
|= S_NOSEC
;
3487 static inline bool is_root_inode(struct inode
*inode
)
3489 return inode
== inode
->i_sb
->s_root
->d_inode
;
3492 static inline bool dir_emit(struct dir_context
*ctx
,
3493 const char *name
, int namelen
,
3494 u64 ino
, unsigned type
)
3496 return ctx
->actor(ctx
, name
, namelen
, ctx
->pos
, ino
, type
) == 0;
3498 static inline bool dir_emit_dot(struct file
*file
, struct dir_context
*ctx
)
3500 return ctx
->actor(ctx
, ".", 1, ctx
->pos
,
3501 file
->f_path
.dentry
->d_inode
->i_ino
, DT_DIR
) == 0;
3503 static inline bool dir_emit_dotdot(struct file
*file
, struct dir_context
*ctx
)
3505 return ctx
->actor(ctx
, "..", 2, ctx
->pos
,
3506 parent_ino(file
->f_path
.dentry
), DT_DIR
) == 0;
3508 static inline bool dir_emit_dots(struct file
*file
, struct dir_context
*ctx
)
3510 if (ctx
->pos
== 0) {
3511 if (!dir_emit_dot(file
, ctx
))
3515 if (ctx
->pos
== 1) {
3516 if (!dir_emit_dotdot(file
, ctx
))
3522 static inline bool dir_relax(struct inode
*inode
)
3524 inode_unlock(inode
);
3526 return !IS_DEADDIR(inode
);
3529 static inline bool dir_relax_shared(struct inode
*inode
)
3531 inode_unlock_shared(inode
);
3532 inode_lock_shared(inode
);
3533 return !IS_DEADDIR(inode
);
3536 extern bool path_noexec(const struct path
*path
);
3537 extern bool path_nosuid(const struct path
*path
);
3538 extern void inode_nohighmem(struct inode
*inode
);
3541 extern int vfs_fadvise(struct file
*file
, loff_t offset
, loff_t len
,
3544 #endif /* _LINUX_FS_H */