5 #include <linux/linkage.h>
6 #include <linux/wait.h>
7 #include <linux/kdev_t.h>
8 #include <linux/dcache.h>
9 #include <linux/path.h>
10 #include <linux/stat.h>
11 #include <linux/cache.h>
12 #include <linux/list.h>
13 #include <linux/llist.h>
14 #include <linux/radix-tree.h>
15 #include <linux/rbtree.h>
16 #include <linux/init.h>
17 #include <linux/pid.h>
18 #include <linux/bug.h>
19 #include <linux/mutex.h>
20 #include <linux/capability.h>
21 #include <linux/semaphore.h>
22 #include <linux/fiemap.h>
23 #include <linux/rculist_bl.h>
24 #include <linux/atomic.h>
25 #include <linux/shrinker.h>
26 #include <linux/migrate_mode.h>
27 #include <linux/uidgid.h>
28 #include <linux/lockdep.h>
29 #include <linux/percpu-rwsem.h>
30 #include <linux/blk_types.h>
32 #include <asm/byteorder.h>
33 #include <uapi/linux/fs.h>
35 struct export_operations;
41 struct pipe_inode_info;
42 struct poll_table_struct;
44 struct vm_area_struct;
47 struct swap_info_struct;
50 extern void __init inode_init(void);
51 extern void __init inode_init_early(void);
52 extern void __init files_init(unsigned long);
54 extern struct files_stat_struct files_stat;
55 extern unsigned long get_max_files(void);
56 extern int sysctl_nr_open;
57 extern struct inodes_stat_t inodes_stat;
58 extern int leases_enable, lease_break_time;
59 extern int sysctl_protected_symlinks;
60 extern int sysctl_protected_hardlinks;
63 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
64 struct buffer_head *bh_result, int create);
65 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
66 ssize_t bytes, void *private, int ret,
69 #define MAY_EXEC 0x00000001
70 #define MAY_WRITE 0x00000002
71 #define MAY_READ 0x00000004
72 #define MAY_APPEND 0x00000008
73 #define MAY_ACCESS 0x00000010
74 #define MAY_OPEN 0x00000020
75 #define MAY_CHDIR 0x00000040
76 /* called from RCU mode, don't block */
77 #define MAY_NOT_BLOCK 0x00000080
80 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
81 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
84 /* file is open for reading */
85 #define FMODE_READ ((__force fmode_t)0x1)
86 /* file is open for writing */
87 #define FMODE_WRITE ((__force fmode_t)0x2)
88 /* file is seekable */
89 #define FMODE_LSEEK ((__force fmode_t)0x4)
90 /* file can be accessed using pread */
91 #define FMODE_PREAD ((__force fmode_t)0x8)
92 /* file can be accessed using pwrite */
93 #define FMODE_PWRITE ((__force fmode_t)0x10)
94 /* File is opened for execution with sys_execve / sys_uselib */
95 #define FMODE_EXEC ((__force fmode_t)0x20)
96 /* File is opened with O_NDELAY (only set for block devices) */
97 #define FMODE_NDELAY ((__force fmode_t)0x40)
98 /* File is opened with O_EXCL (only set for block devices) */
99 #define FMODE_EXCL ((__force fmode_t)0x80)
100 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
101 (specialy hack for floppy.c) */
102 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100)
103 /* 32bit hashes as llseek() offset (for directories) */
104 #define FMODE_32BITHASH ((__force fmode_t)0x200)
105 /* 64bit hashes as llseek() offset (for directories) */
106 #define FMODE_64BITHASH ((__force fmode_t)0x400)
109 * Don't update ctime and mtime.
111 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
112 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
114 #define FMODE_NOCMTIME ((__force fmode_t)0x800)
116 /* Expect random access pattern */
117 #define FMODE_RANDOM ((__force fmode_t)0x1000)
119 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
120 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000)
122 /* File is opened with O_PATH; almost nothing can be done with it */
123 #define FMODE_PATH ((__force fmode_t)0x4000)
125 /* File was opened by fanotify and shouldn't generate fanotify events */
126 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
129 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
130 * that indicates that they should check the contents of the iovec are
131 * valid, but not check the memory that the iovec elements
134 #define CHECK_IOVEC_ONLY -1
137 * The below are the various read and write types that we support. Some of
138 * them include behavioral modifiers that send information down to the
139 * block layer and IO scheduler. Terminology:
141 * The block layer uses device plugging to defer IO a little bit, in
142 * the hope that we will see more IO very shortly. This increases
143 * coalescing of adjacent IO and thus reduces the number of IOs we
144 * have to send to the device. It also allows for better queuing,
145 * if the IO isn't mergeable. If the caller is going to be waiting
146 * for the IO, then he must ensure that the device is unplugged so
147 * that the IO is dispatched to the driver.
149 * All IO is handled async in Linux. This is fine for background
150 * writes, but for reads or writes that someone waits for completion
151 * on, we want to notify the block layer and IO scheduler so that they
152 * know about it. That allows them to make better scheduling
153 * decisions. So when the below references 'sync' and 'async', it
154 * is referencing this priority hint.
156 * With that in mind, the available types are:
158 * READ A normal read operation. Device will be plugged.
159 * READ_SYNC A synchronous read. Device is not plugged, caller can
160 * immediately wait on this read without caring about
162 * READA Used for read-ahead operations. Lower priority, and the
163 * block layer could (in theory) choose to ignore this
164 * request if it runs into resource problems.
165 * WRITE A normal async write. Device will be plugged.
166 * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down
167 * the hint that someone will be waiting on this IO
168 * shortly. The write equivalent of READ_SYNC.
169 * WRITE_ODIRECT Special case write for O_DIRECT only.
170 * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush.
171 * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on
172 * non-volatile media on completion.
173 * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded
174 * by a cache flush and data is guaranteed to be on
175 * non-volatile media on completion.
178 #define RW_MASK REQ_WRITE
179 #define RWA_MASK REQ_RAHEAD
182 #define WRITE RW_MASK
183 #define READA RWA_MASK
184 #define KERNEL_READ (READ|REQ_KERNEL)
185 #define KERNEL_WRITE (WRITE|REQ_KERNEL)
187 #define READ_SYNC (READ | REQ_SYNC)
188 #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE)
189 #define WRITE_ODIRECT (WRITE | REQ_SYNC)
190 #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
191 #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
192 #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
195 * Attribute flags. These should be or-ed together to figure out what
198 #define ATTR_MODE (1 << 0)
199 #define ATTR_UID (1 << 1)
200 #define ATTR_GID (1 << 2)
201 #define ATTR_SIZE (1 << 3)
202 #define ATTR_ATIME (1 << 4)
203 #define ATTR_MTIME (1 << 5)
204 #define ATTR_CTIME (1 << 6)
205 #define ATTR_ATIME_SET (1 << 7)
206 #define ATTR_MTIME_SET (1 << 8)
207 #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */
208 #define ATTR_ATTR_FLAG (1 << 10)
209 #define ATTR_KILL_SUID (1 << 11)
210 #define ATTR_KILL_SGID (1 << 12)
211 #define ATTR_FILE (1 << 13)
212 #define ATTR_KILL_PRIV (1 << 14)
213 #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
214 #define ATTR_TIMES_SET (1 << 16)
217 * This is the Inode Attributes structure, used for notify_change(). It
218 * uses the above definitions as flags, to know which values have changed.
219 * Also, in this manner, a Filesystem can look at only the values it cares
220 * about. Basically, these are the attributes that the VFS layer can
221 * request to change from the FS layer.
223 * Derek Atkins <warlord@MIT.EDU> 94-10-20
226 unsigned int ia_valid;
231 struct timespec ia_atime;
232 struct timespec ia_mtime;
233 struct timespec ia_ctime;
236 * Not an attribute, but an auxiliary info for filesystems wanting to
237 * implement an ftruncate() like method. NOTE: filesystem should
238 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
240 struct file *ia_file;
244 * Includes for diskquotas.
246 #include <linux/quota.h>
249 * enum positive_aop_returns - aop return codes with specific semantics
251 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
252 * completed, that the page is still locked, and
253 * should be considered active. The VM uses this hint
254 * to return the page to the active list -- it won't
255 * be a candidate for writeback again in the near
256 * future. Other callers must be careful to unlock
257 * the page if they get this return. Returned by
260 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
261 * unlocked it and the page might have been truncated.
262 * The caller should back up to acquiring a new page and
263 * trying again. The aop will be taking reasonable
264 * precautions not to livelock. If the caller held a page
265 * reference, it should drop it before retrying. Returned
268 * address_space_operation functions return these large constants to indicate
269 * special semantics to the caller. These are much larger than the bytes in a
270 * page to allow for functions that return the number of bytes operated on in a
274 enum positive_aop_returns {
275 AOP_WRITEPAGE_ACTIVATE = 0x80000,
276 AOP_TRUNCATED_PAGE = 0x80001,
279 #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
280 #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
281 #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct
282 * helper code (eg buffer layer)
283 * to clear GFP_FS from alloc */
286 * oh the beauties of C type declarations.
289 struct address_space;
290 struct writeback_control;
293 const struct iovec *iov;
294 unsigned long nr_segs;
299 size_t iov_iter_copy_from_user_atomic(struct page *page,
300 struct iov_iter *i, unsigned long offset, size_t bytes);
301 size_t iov_iter_copy_from_user(struct page *page,
302 struct iov_iter *i, unsigned long offset, size_t bytes);
303 void iov_iter_advance(struct iov_iter *i, size_t bytes);
304 int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
305 size_t iov_iter_single_seg_count(const struct iov_iter *i);
307 static inline void iov_iter_init(struct iov_iter *i,
308 const struct iovec *iov, unsigned long nr_segs,
309 size_t count, size_t written)
312 i->nr_segs = nr_segs;
314 i->count = count + written;
316 iov_iter_advance(i, written);
319 static inline size_t iov_iter_count(struct iov_iter *i)
325 * "descriptor" for what we're up to with a read.
326 * This allows us to use the same read code yet
327 * have multiple different users of the data that
328 * we read from a file.
330 * The simplest case just copies the data to user
343 typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
344 unsigned long, unsigned long);
346 struct address_space_operations {
347 int (*writepage)(struct page *page, struct writeback_control *wbc);
348 int (*readpage)(struct file *, struct page *);
350 /* Write back some dirty pages from this mapping. */
351 int (*writepages)(struct address_space *, struct writeback_control *);
353 /* Set a page dirty. Return true if this dirtied it */
354 int (*set_page_dirty)(struct page *page);
356 int (*readpages)(struct file *filp, struct address_space *mapping,
357 struct list_head *pages, unsigned nr_pages);
359 int (*write_begin)(struct file *, struct address_space *mapping,
360 loff_t pos, unsigned len, unsigned flags,
361 struct page **pagep, void **fsdata);
362 int (*write_end)(struct file *, struct address_space *mapping,
363 loff_t pos, unsigned len, unsigned copied,
364 struct page *page, void *fsdata);
366 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
367 sector_t (*bmap)(struct address_space *, sector_t);
368 void (*invalidatepage) (struct page *, unsigned int, unsigned int);
369 int (*releasepage) (struct page *, gfp_t);
370 void (*freepage)(struct page *);
371 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
372 loff_t offset, unsigned long nr_segs);
373 int (*get_xip_mem)(struct address_space *, pgoff_t, int,
374 void **, unsigned long *);
376 * migrate the contents of a page to the specified target. If
377 * migrate_mode is MIGRATE_ASYNC, it must not block.
379 int (*migratepage) (struct address_space *,
380 struct page *, struct page *, enum migrate_mode);
381 int (*launder_page) (struct page *);
382 int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
384 void (*is_dirty_writeback) (struct page *, bool *, bool *);
385 int (*error_remove_page)(struct address_space *, struct page *);
387 /* swapfile support */
388 int (*swap_activate)(struct swap_info_struct *sis, struct file *file,
390 void (*swap_deactivate)(struct file *file);
393 extern const struct address_space_operations empty_aops;
396 * pagecache_write_begin/pagecache_write_end must be used by general code
397 * to write into the pagecache.
399 int pagecache_write_begin(struct file *, struct address_space *mapping,
400 loff_t pos, unsigned len, unsigned flags,
401 struct page **pagep, void **fsdata);
403 int pagecache_write_end(struct file *, struct address_space *mapping,
404 loff_t pos, unsigned len, unsigned copied,
405 struct page *page, void *fsdata);
407 struct backing_dev_info;
408 struct address_space {
409 struct inode *host; /* owner: inode, block_device */
410 struct radix_tree_root page_tree; /* radix tree of all pages */
411 spinlock_t tree_lock; /* and lock protecting it */
412 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
413 struct rb_root i_mmap; /* tree of private and shared mappings */
414 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
415 struct mutex i_mmap_mutex; /* protect tree, count, list */
416 /* Protected by tree_lock together with the radix tree */
417 unsigned long nrpages; /* number of total pages */
418 pgoff_t writeback_index;/* writeback starts here */
419 const struct address_space_operations *a_ops; /* methods */
420 unsigned long flags; /* error bits/gfp mask */
421 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
422 spinlock_t private_lock; /* for use by the address_space */
423 struct list_head private_list; /* ditto */
424 void *private_data; /* ditto */
425 } __attribute__((aligned(sizeof(long))));
427 * On most architectures that alignment is already the case; but
428 * must be enforced here for CRIS, to let the least significant bit
429 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
431 struct request_queue;
433 struct block_device {
434 dev_t bd_dev; /* not a kdev_t - it's a search key */
436 struct inode * bd_inode; /* will die */
437 struct super_block * bd_super;
438 struct mutex bd_mutex; /* open/close mutex */
439 struct list_head bd_inodes;
443 bool bd_write_holder;
445 struct list_head bd_holder_disks;
447 struct block_device * bd_contains;
448 unsigned bd_block_size;
449 struct hd_struct * bd_part;
450 /* number of times partitions within this device have been opened. */
451 unsigned bd_part_count;
453 struct gendisk * bd_disk;
454 struct request_queue * bd_queue;
455 struct list_head bd_list;
457 * Private data. You must have bd_claim'ed the block_device
458 * to use this. NOTE: bd_claim allows an owner to claim
459 * the same device multiple times, the owner must take special
460 * care to not mess up bd_private for that case.
462 unsigned long bd_private;
464 /* The counter of freeze processes */
465 int bd_fsfreeze_count;
466 /* Mutex for freeze */
467 struct mutex bd_fsfreeze_mutex;
471 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
474 #define PAGECACHE_TAG_DIRTY 0
475 #define PAGECACHE_TAG_WRITEBACK 1
476 #define PAGECACHE_TAG_TOWRITE 2
478 int mapping_tagged(struct address_space *mapping, int tag);
481 * Might pages of this file be mapped into userspace?
483 static inline int mapping_mapped(struct address_space *mapping)
485 return !RB_EMPTY_ROOT(&mapping->i_mmap) ||
486 !list_empty(&mapping->i_mmap_nonlinear);
490 * Might pages of this file have been modified in userspace?
491 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
492 * marks vma as VM_SHARED if it is shared, and the file was opened for
493 * writing i.e. vma may be mprotected writable even if now readonly.
495 static inline int mapping_writably_mapped(struct address_space *mapping)
497 return mapping->i_mmap_writable != 0;
501 * Use sequence counter to get consistent i_size on 32-bit processors.
503 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
504 #include <linux/seqlock.h>
505 #define __NEED_I_SIZE_ORDERED
506 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
508 #define i_size_ordered_init(inode) do { } while (0)
512 #define ACL_NOT_CACHED ((void *)(-1))
514 #define IOP_FASTPERM 0x0001
515 #define IOP_LOOKUP 0x0002
516 #define IOP_NOFOLLOW 0x0004
519 * Keep mostly read-only and often accessed (especially for
520 * the RCU path lookup and 'stat' data) fields at the beginning
521 * of the 'struct inode'
525 unsigned short i_opflags;
528 unsigned int i_flags;
530 #ifdef CONFIG_FS_POSIX_ACL
531 struct posix_acl *i_acl;
532 struct posix_acl *i_default_acl;
535 const struct inode_operations *i_op;
536 struct super_block *i_sb;
537 struct address_space *i_mapping;
539 #ifdef CONFIG_SECURITY
543 /* Stat data, not accessed from path walking */
546 * Filesystems may only read i_nlink directly. They shall use the
547 * following functions for modification:
549 * (set|clear|inc|drop)_nlink
550 * inode_(inc|dec)_link_count
553 const unsigned int i_nlink;
554 unsigned int __i_nlink;
558 struct timespec i_atime;
559 struct timespec i_mtime;
560 struct timespec i_ctime;
561 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
562 unsigned short i_bytes;
563 unsigned int i_blkbits;
566 #ifdef __NEED_I_SIZE_ORDERED
567 seqcount_t i_size_seqcount;
571 unsigned long i_state;
572 struct mutex i_mutex;
574 unsigned long dirtied_when; /* jiffies of first dirtying */
576 struct hlist_node i_hash;
577 struct list_head i_wb_list; /* backing dev IO list */
578 struct list_head i_lru; /* inode LRU list */
579 struct list_head i_sb_list;
581 struct hlist_head i_dentry;
582 struct rcu_head i_rcu;
586 atomic_t i_dio_count;
587 atomic_t i_writecount;
588 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
589 struct file_lock *i_flock;
590 struct address_space i_data;
592 struct dquot *i_dquot[MAXQUOTAS];
594 struct list_head i_devices;
596 struct pipe_inode_info *i_pipe;
597 struct block_device *i_bdev;
603 #ifdef CONFIG_FSNOTIFY
604 __u32 i_fsnotify_mask; /* all events this inode cares about */
605 struct hlist_head i_fsnotify_marks;
609 atomic_t i_readcount; /* struct files open RO */
611 void *i_private; /* fs or device private pointer */
614 static inline int inode_unhashed(struct inode *inode)
616 return hlist_unhashed(&inode->i_hash);
620 * inode->i_mutex nesting subclasses for the lock validator:
622 * 0: the object of the current VFS operation
627 * The locking order between these classes is
628 * parent -> child -> normal -> xattr -> quota
630 enum inode_i_mutex_lock_class
640 * NOTE: in a 32bit arch with a preemptable kernel and
641 * an UP compile the i_size_read/write must be atomic
642 * with respect to the local cpu (unlike with preempt disabled),
643 * but they don't need to be atomic with respect to other cpus like in
644 * true SMP (so they need either to either locally disable irq around
645 * the read or for example on x86 they can be still implemented as a
646 * cmpxchg8b without the need of the lock prefix). For SMP compiles
647 * and 64bit archs it makes no difference if preempt is enabled or not.
649 static inline loff_t i_size_read(const struct inode *inode)
651 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
656 seq = read_seqcount_begin(&inode->i_size_seqcount);
657 i_size = inode->i_size;
658 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
660 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
664 i_size = inode->i_size;
668 return inode->i_size;
673 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
674 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
675 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
677 static inline void i_size_write(struct inode *inode, loff_t i_size)
679 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
681 write_seqcount_begin(&inode->i_size_seqcount);
682 inode->i_size = i_size;
683 write_seqcount_end(&inode->i_size_seqcount);
685 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
687 inode->i_size = i_size;
690 inode->i_size = i_size;
694 /* Helper functions so that in most cases filesystems will
695 * not need to deal directly with kuid_t and kgid_t and can
696 * instead deal with the raw numeric values that are stored
699 static inline uid_t i_uid_read(const struct inode *inode)
701 return from_kuid(&init_user_ns, inode->i_uid);
704 static inline gid_t i_gid_read(const struct inode *inode)
706 return from_kgid(&init_user_ns, inode->i_gid);
709 static inline void i_uid_write(struct inode *inode, uid_t uid)
711 inode->i_uid = make_kuid(&init_user_ns, uid);
714 static inline void i_gid_write(struct inode *inode, gid_t gid)
716 inode->i_gid = make_kgid(&init_user_ns, gid);
719 static inline unsigned iminor(const struct inode *inode)
721 return MINOR(inode->i_rdev);
724 static inline unsigned imajor(const struct inode *inode)
726 return MAJOR(inode->i_rdev);
729 extern struct block_device *I_BDEV(struct inode *inode);
732 rwlock_t lock; /* protects pid, uid, euid fields */
733 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
734 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
735 kuid_t uid, euid; /* uid/euid of process setting the owner */
736 int signum; /* posix.1b rt signal to be delivered on IO */
740 * Track a single file's readahead state
742 struct file_ra_state {
743 pgoff_t start; /* where readahead started */
744 unsigned int size; /* # of readahead pages */
745 unsigned int async_size; /* do asynchronous readahead when
746 there are only # of pages ahead */
748 unsigned int ra_pages; /* Maximum readahead window */
749 unsigned int mmap_miss; /* Cache miss stat for mmap accesses */
750 loff_t prev_pos; /* Cache last read() position */
754 * Check if @index falls in the readahead windows.
756 static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
758 return (index >= ra->start &&
759 index < ra->start + ra->size);
762 #define FILE_MNT_WRITE_TAKEN 1
763 #define FILE_MNT_WRITE_RELEASED 2
767 * fu_list becomes invalid after file_free is called and queued via
768 * fu_rcuhead for RCU freeing
771 struct list_head fu_list;
772 struct llist_node fu_llist;
773 struct rcu_head fu_rcuhead;
776 #define f_dentry f_path.dentry
777 struct inode *f_inode; /* cached value */
778 const struct file_operations *f_op;
781 * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.
782 * Must not be taken from IRQ context.
788 atomic_long_t f_count;
789 unsigned int f_flags;
792 struct fown_struct f_owner;
793 const struct cred *f_cred;
794 struct file_ra_state f_ra;
797 #ifdef CONFIG_SECURITY
800 /* needed for tty driver, and maybe others */
804 /* Used by fs/eventpoll.c to link all the hooks to this file */
805 struct list_head f_ep_links;
806 struct list_head f_tfile_llink;
807 #endif /* #ifdef CONFIG_EPOLL */
808 struct address_space *f_mapping;
809 #ifdef CONFIG_DEBUG_WRITECOUNT
810 unsigned long f_mnt_write_state;
817 /* file identifier */
818 unsigned char f_handle[0];
821 static inline struct file *get_file(struct file *f)
823 atomic_long_inc(&f->f_count);
826 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
827 #define file_count(x) atomic_long_read(&(x)->f_count)
829 #ifdef CONFIG_DEBUG_WRITECOUNT
830 static inline void file_take_write(struct file *f)
832 WARN_ON(f->f_mnt_write_state != 0);
833 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
835 static inline void file_release_write(struct file *f)
837 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
839 static inline void file_reset_write(struct file *f)
841 f->f_mnt_write_state = 0;
843 static inline void file_check_state(struct file *f)
846 * At this point, either both or neither of these bits
849 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
850 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
852 static inline int file_check_writeable(struct file *f)
854 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
856 printk(KERN_WARNING "writeable file with no "
857 "mnt_want_write()\n");
861 #else /* !CONFIG_DEBUG_WRITECOUNT */
862 static inline void file_take_write(struct file *filp) {}
863 static inline void file_release_write(struct file *filp) {}
864 static inline void file_reset_write(struct file *filp) {}
865 static inline void file_check_state(struct file *filp) {}
866 static inline int file_check_writeable(struct file *filp)
870 #endif /* CONFIG_DEBUG_WRITECOUNT */
872 #define MAX_NON_LFS ((1UL<<31) - 1)
874 /* Page cache limit. The filesystems should put that into their s_maxbytes
875 limits, otherwise bad things can happen in VM. */
876 #if BITS_PER_LONG==32
877 #define MAX_LFS_FILESIZE (((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
878 #elif BITS_PER_LONG==64
879 #define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL)
884 #define FL_ACCESS 8 /* not trying to lock, just looking */
885 #define FL_EXISTS 16 /* when unlocking, test for existence */
886 #define FL_LEASE 32 /* lease held on this file */
887 #define FL_CLOSE 64 /* unlock on close */
888 #define FL_SLEEP 128 /* A blocking lock */
889 #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
890 #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
893 * Special return value from posix_lock_file() and vfs_lock_file() for
894 * asynchronous locking.
896 #define FILE_LOCK_DEFERRED 1
899 * The POSIX file lock owner is determined by
900 * the "struct files_struct" in the thread group
901 * (or NULL for no owner - BSD locks).
903 * Lockd stuffs a "host" pointer into this.
905 typedef struct files_struct *fl_owner_t;
907 struct file_lock_operations {
908 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
909 void (*fl_release_private)(struct file_lock *);
912 struct lock_manager_operations {
913 int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
914 unsigned long (*lm_owner_key)(struct file_lock *);
915 void (*lm_notify)(struct file_lock *); /* unblock callback */
916 int (*lm_grant)(struct file_lock *, struct file_lock *, int);
917 void (*lm_break)(struct file_lock *);
918 int (*lm_change)(struct file_lock **, int);
921 struct lock_manager {
922 struct list_head list;
926 void locks_start_grace(struct net *, struct lock_manager *);
927 void locks_end_grace(struct lock_manager *);
928 int locks_in_grace(struct net *);
930 /* that will die - we need it for nfs_lock_info */
931 #include <linux/nfs_fs_i.h>
934 * struct file_lock represents a generic "file lock". It's used to represent
935 * POSIX byte range locks, BSD (flock) locks, and leases. It's important to
936 * note that the same struct is used to represent both a request for a lock and
937 * the lock itself, but the same object is never used for both.
939 * FIXME: should we create a separate "struct lock_request" to help distinguish
942 * The i_flock list is ordered by:
944 * 1) lock type -- FL_LEASEs first, then FL_FLOCK, and finally FL_POSIX
946 * 3) lock range start
949 * Obviously, the last two criteria only matter for POSIX locks.
952 struct file_lock *fl_next; /* singly linked list for this inode */
953 struct hlist_node fl_link; /* node in global lists */
954 struct list_head fl_block; /* circular list of blocked processes */
956 unsigned int fl_flags;
957 unsigned char fl_type;
959 int fl_link_cpu; /* what cpu's list is this on? */
960 struct pid *fl_nspid;
961 wait_queue_head_t fl_wait;
962 struct file *fl_file;
966 struct fasync_struct * fl_fasync; /* for lease break notifications */
967 /* for lease breaks: */
968 unsigned long fl_break_time;
969 unsigned long fl_downgrade_time;
971 const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
972 const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
974 struct nfs_lock_info nfs_fl;
975 struct nfs4_lock_info nfs4_fl;
977 struct list_head link; /* link in AFS vnode's pending_locks list */
978 int state; /* state of grant or error if -ve */
983 /* The following constant reflects the upper bound of the file/locking space */
985 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
986 #define OFFSET_MAX INT_LIMIT(loff_t)
987 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
990 #include <linux/fcntl.h>
992 extern void send_sigio(struct fown_struct *fown, int fd, int band);
994 #ifdef CONFIG_FILE_LOCKING
995 extern int fcntl_getlk(struct file *, struct flock __user *);
996 extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
997 struct flock __user *);
999 #if BITS_PER_LONG == 32
1000 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
1001 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
1002 struct flock64 __user *);
1005 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
1006 extern int fcntl_getlease(struct file *filp);
1009 void locks_free_lock(struct file_lock *fl);
1010 extern void locks_init_lock(struct file_lock *);
1011 extern struct file_lock * locks_alloc_lock(void);
1012 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
1013 extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
1014 extern void locks_remove_posix(struct file *, fl_owner_t);
1015 extern void locks_remove_flock(struct file *);
1016 extern void locks_release_private(struct file_lock *);
1017 extern void posix_test_lock(struct file *, struct file_lock *);
1018 extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
1019 extern int posix_lock_file_wait(struct file *, struct file_lock *);
1020 extern int posix_unblock_lock(struct file_lock *);
1021 extern int vfs_test_lock(struct file *, struct file_lock *);
1022 extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
1023 extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
1024 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
1025 extern int __break_lease(struct inode *inode, unsigned int flags);
1026 extern void lease_get_mtime(struct inode *, struct timespec *time);
1027 extern int generic_setlease(struct file *, long, struct file_lock **);
1028 extern int vfs_setlease(struct file *, long, struct file_lock **);
1029 extern int lease_modify(struct file_lock **, int);
1030 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
1031 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
1032 #else /* !CONFIG_FILE_LOCKING */
1033 static inline int fcntl_getlk(struct file *file, struct flock __user *user)
1038 static inline int fcntl_setlk(unsigned int fd, struct file *file,
1039 unsigned int cmd, struct flock __user *user)
1044 #if BITS_PER_LONG == 32
1045 static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user)
1050 static inline int fcntl_setlk64(unsigned int fd, struct file *file,
1051 unsigned int cmd, struct flock64 __user *user)
1056 static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
1061 static inline int fcntl_getlease(struct file *filp)
1066 static inline void locks_init_lock(struct file_lock *fl)
1071 static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1076 static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
1081 static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
1086 static inline void locks_remove_flock(struct file *filp)
1091 static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
1096 static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
1097 struct file_lock *conflock)
1102 static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl)
1107 static inline int posix_unblock_lock(struct file_lock *waiter)
1112 static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
1117 static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
1118 struct file_lock *fl, struct file_lock *conf)
1123 static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
1128 static inline int flock_lock_file_wait(struct file *filp,
1129 struct file_lock *request)
1134 static inline int __break_lease(struct inode *inode, unsigned int mode)
1139 static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
1144 static inline int generic_setlease(struct file *filp, long arg,
1145 struct file_lock **flp)
1150 static inline int vfs_setlease(struct file *filp, long arg,
1151 struct file_lock **lease)
1156 static inline int lease_modify(struct file_lock **before, int arg)
1161 static inline int lock_may_read(struct inode *inode, loff_t start,
1167 static inline int lock_may_write(struct inode *inode, loff_t start,
1172 #endif /* !CONFIG_FILE_LOCKING */
1175 struct fasync_struct {
1179 struct fasync_struct *fa_next; /* singly linked list */
1180 struct file *fa_file;
1181 struct rcu_head fa_rcu;
1184 #define FASYNC_MAGIC 0x4601
1186 /* SMP safe fasync helpers: */
1187 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1188 extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *);
1189 extern int fasync_remove_entry(struct file *, struct fasync_struct **);
1190 extern struct fasync_struct *fasync_alloc(void);
1191 extern void fasync_free(struct fasync_struct *);
1193 /* can be called from interrupts */
1194 extern void kill_fasync(struct fasync_struct **, int, int);
1196 extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
1197 extern int f_setown(struct file *filp, unsigned long arg, int force);
1198 extern void f_delown(struct file *filp);
1199 extern pid_t f_getown(struct file *filp);
1200 extern int send_sigurg(struct fown_struct *fown);
1208 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1209 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
1210 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1211 #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
1212 #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */
1214 extern struct list_head super_blocks;
1215 extern spinlock_t sb_lock;
1217 /* Possible states of 'frozen' field */
1219 SB_UNFROZEN = 0, /* FS is unfrozen */
1220 SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */
1221 SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */
1222 SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop
1223 * internal threads if needed) */
1224 SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */
1227 #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
1230 /* Counters for counting writers at each level */
1231 struct percpu_counter counter[SB_FREEZE_LEVELS];
1232 wait_queue_head_t wait; /* queue for waiting for
1233 writers / faults to finish */
1234 int frozen; /* Is sb frozen? */
1235 wait_queue_head_t wait_unfrozen; /* queue for waiting for
1237 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1238 struct lockdep_map lock_map[SB_FREEZE_LEVELS];
1242 struct super_block {
1243 struct list_head s_list; /* Keep this first */
1244 dev_t s_dev; /* search index; _not_ kdev_t */
1245 unsigned char s_blocksize_bits;
1246 unsigned long s_blocksize;
1247 loff_t s_maxbytes; /* Max file size */
1248 struct file_system_type *s_type;
1249 const struct super_operations *s_op;
1250 const struct dquot_operations *dq_op;
1251 const struct quotactl_ops *s_qcop;
1252 const struct export_operations *s_export_op;
1253 unsigned long s_flags;
1254 unsigned long s_magic;
1255 struct dentry *s_root;
1256 struct rw_semaphore s_umount;
1259 #ifdef CONFIG_SECURITY
1262 const struct xattr_handler **s_xattr;
1264 struct list_head s_inodes; /* all inodes */
1265 struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */
1267 struct list_head __percpu *s_files;
1269 struct list_head s_files;
1271 struct list_head s_mounts; /* list of mounts; _not_ for fs use */
1272 /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1273 struct list_head s_dentry_lru; /* unused dentry lru */
1274 int s_nr_dentry_unused; /* # of dentry on lru */
1276 /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
1277 spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp;
1278 struct list_head s_inode_lru; /* unused inode lru */
1279 int s_nr_inodes_unused; /* # of inodes on lru */
1281 struct block_device *s_bdev;
1282 struct backing_dev_info *s_bdi;
1283 struct mtd_info *s_mtd;
1284 struct hlist_node s_instances;
1285 struct quota_info s_dquot; /* Diskquota specific options */
1287 struct sb_writers s_writers;
1289 char s_id[32]; /* Informational name */
1290 u8 s_uuid[16]; /* UUID */
1292 void *s_fs_info; /* Filesystem private info */
1293 unsigned int s_max_links;
1296 /* Granularity of c/m/atime in ns.
1297 Cannot be worse than a second */
1301 * The next field is for VFS *only*. No filesystems have any business
1302 * even looking at it. You had been warned.
1304 struct mutex s_vfs_rename_mutex; /* Kludge */
1307 * Filesystem subtype. If non-empty the filesystem type field
1308 * in /proc/mounts will be "type.subtype"
1313 * Saved mount options for lazy filesystems using
1314 * generic_show_options()
1316 char __rcu *s_options;
1317 const struct dentry_operations *s_d_op; /* default d_op for dentries */
1320 * Saved pool identifier for cleancache (-1 means none)
1322 int cleancache_poolid;
1324 struct shrinker s_shrink; /* per-sb shrinker handle */
1326 /* Number of inodes with nlink == 0 but still referenced */
1327 atomic_long_t s_remove_count;
1329 /* Being remounted read-only */
1330 int s_readonly_remount;
1333 /* superblock cache pruning functions */
1334 extern void prune_icache_sb(struct super_block *sb, int nr_to_scan);
1335 extern void prune_dcache_sb(struct super_block *sb, int nr_to_scan);
1337 extern struct timespec current_fs_time(struct super_block *sb);
1340 * Snapshotting support.
1343 void __sb_end_write(struct super_block *sb, int level);
1344 int __sb_start_write(struct super_block *sb, int level, bool wait);
1347 * sb_end_write - drop write access to a superblock
1348 * @sb: the super we wrote to
1350 * Decrement number of writers to the filesystem. Wake up possible waiters
1351 * wanting to freeze the filesystem.
1353 static inline void sb_end_write(struct super_block *sb)
1355 __sb_end_write(sb, SB_FREEZE_WRITE);
1359 * sb_end_pagefault - drop write access to a superblock from a page fault
1360 * @sb: the super we wrote to
1362 * Decrement number of processes handling write page fault to the filesystem.
1363 * Wake up possible waiters wanting to freeze the filesystem.
1365 static inline void sb_end_pagefault(struct super_block *sb)
1367 __sb_end_write(sb, SB_FREEZE_PAGEFAULT);
1371 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
1372 * @sb: the super we wrote to
1374 * Decrement fs-internal number of writers to the filesystem. Wake up possible
1375 * waiters wanting to freeze the filesystem.
1377 static inline void sb_end_intwrite(struct super_block *sb)
1379 __sb_end_write(sb, SB_FREEZE_FS);
1383 * sb_start_write - get write access to a superblock
1384 * @sb: the super we write to
1386 * When a process wants to write data or metadata to a file system (i.e. dirty
1387 * a page or an inode), it should embed the operation in a sb_start_write() -
1388 * sb_end_write() pair to get exclusion against file system freezing. This
1389 * function increments number of writers preventing freezing. If the file
1390 * system is already frozen, the function waits until the file system is
1393 * Since freeze protection behaves as a lock, users have to preserve
1394 * ordering of freeze protection and other filesystem locks. Generally,
1395 * freeze protection should be the outermost lock. In particular, we have:
1398 * -> i_mutex (write path, truncate, directory ops, ...)
1399 * -> s_umount (freeze_super, thaw_super)
1401 static inline void sb_start_write(struct super_block *sb)
1403 __sb_start_write(sb, SB_FREEZE_WRITE, true);
1406 static inline int sb_start_write_trylock(struct super_block *sb)
1408 return __sb_start_write(sb, SB_FREEZE_WRITE, false);
1412 * sb_start_pagefault - get write access to a superblock from a page fault
1413 * @sb: the super we write to
1415 * When a process starts handling write page fault, it should embed the
1416 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
1417 * exclusion against file system freezing. This is needed since the page fault
1418 * is going to dirty a page. This function increments number of running page
1419 * faults preventing freezing. If the file system is already frozen, the
1420 * function waits until the file system is thawed.
1422 * Since page fault freeze protection behaves as a lock, users have to preserve
1423 * ordering of freeze protection and other filesystem locks. It is advised to
1424 * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
1425 * handling code implies lock dependency:
1428 * -> sb_start_pagefault
1430 static inline void sb_start_pagefault(struct super_block *sb)
1432 __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true);
1436 * sb_start_intwrite - get write access to a superblock for internal fs purposes
1437 * @sb: the super we write to
1439 * This is the third level of protection against filesystem freezing. It is
1440 * free for use by a filesystem. The only requirement is that it must rank
1441 * below sb_start_pagefault.
1443 * For example filesystem can call sb_start_intwrite() when starting a
1444 * transaction which somewhat eases handling of freezing for internal sources
1445 * of filesystem changes (internal fs threads, discarding preallocation on file
1448 static inline void sb_start_intwrite(struct super_block *sb)
1450 __sb_start_write(sb, SB_FREEZE_FS, true);
1454 extern bool inode_owner_or_capable(const struct inode *inode);
1457 * VFS helper functions..
1459 extern int vfs_create(struct inode *, struct dentry *, umode_t, bool);
1460 extern int vfs_mkdir(struct inode *, struct dentry *, umode_t);
1461 extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
1462 extern int vfs_symlink(struct inode *, struct dentry *, const char *);
1463 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1464 extern int vfs_rmdir(struct inode *, struct dentry *);
1465 extern int vfs_unlink(struct inode *, struct dentry *);
1466 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1469 * VFS dentry helper functions.
1471 extern void dentry_unhash(struct dentry *dentry);
1474 * VFS file helper functions.
1476 extern void inode_init_owner(struct inode *inode, const struct inode *dir,
1479 * VFS FS_IOC_FIEMAP helper definitions.
1481 struct fiemap_extent_info {
1482 unsigned int fi_flags; /* Flags as passed from user */
1483 unsigned int fi_extents_mapped; /* Number of mapped extents */
1484 unsigned int fi_extents_max; /* Size of fiemap_extent array */
1485 struct fiemap_extent __user *fi_extents_start; /* Start of
1486 fiemap_extent array */
1488 int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
1489 u64 phys, u64 len, u32 flags);
1490 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
1495 * NOTE! These match bits 12..15 of stat.st_mode
1496 * (ie "(i_mode >> 12) & 15").
1498 #define DT_UNKNOWN 0
1509 * This is the "filldir" function type, used by readdir() to let
1510 * the kernel specify what kind of dirent layout it wants to have.
1511 * This allows the kernel to read directories into kernel space or
1512 * to have different dirent layouts depending on the binary type.
1514 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1515 struct dir_context {
1516 const filldir_t actor;
1520 struct block_device_operations;
1522 /* These macros are for out of kernel modules to test that
1523 * the kernel supports the unlocked_ioctl and compat_ioctl
1524 * fields in struct file_operations. */
1525 #define HAVE_COMPAT_IOCTL 1
1526 #define HAVE_UNLOCKED_IOCTL 1
1528 struct file_operations {
1529 struct module *owner;
1530 loff_t (*llseek) (struct file *, loff_t, int);
1531 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
1532 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1533 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1534 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1535 int (*iterate) (struct file *, struct dir_context *);
1536 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1537 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1538 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1539 int (*mmap) (struct file *, struct vm_area_struct *);
1540 int (*open) (struct inode *, struct file *);
1541 int (*flush) (struct file *, fl_owner_t id);
1542 int (*release) (struct inode *, struct file *);
1543 int (*fsync) (struct file *, loff_t, loff_t, int datasync);
1544 int (*aio_fsync) (struct kiocb *, int datasync);
1545 int (*fasync) (int, struct file *, int);
1546 int (*lock) (struct file *, int, struct file_lock *);
1547 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1548 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1549 int (*check_flags)(int);
1550 int (*flock) (struct file *, int, struct file_lock *);
1551 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1552 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1553 int (*setlease)(struct file *, long, struct file_lock **);
1554 long (*fallocate)(struct file *file, int mode, loff_t offset,
1556 int (*show_fdinfo)(struct seq_file *m, struct file *f);
1559 struct inode_operations {
1560 struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
1561 void * (*follow_link) (struct dentry *, struct nameidata *);
1562 int (*permission) (struct inode *, int);
1563 struct posix_acl * (*get_acl)(struct inode *, int);
1565 int (*readlink) (struct dentry *, char __user *,int);
1566 void (*put_link) (struct dentry *, struct nameidata *, void *);
1568 int (*create) (struct inode *,struct dentry *, umode_t, bool);
1569 int (*link) (struct dentry *,struct inode *,struct dentry *);
1570 int (*unlink) (struct inode *,struct dentry *);
1571 int (*symlink) (struct inode *,struct dentry *,const char *);
1572 int (*mkdir) (struct inode *,struct dentry *,umode_t);
1573 int (*rmdir) (struct inode *,struct dentry *);
1574 int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
1575 int (*rename) (struct inode *, struct dentry *,
1576 struct inode *, struct dentry *);
1577 int (*setattr) (struct dentry *, struct iattr *);
1578 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1579 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1580 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1581 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1582 int (*removexattr) (struct dentry *, const char *);
1583 int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
1585 int (*update_time)(struct inode *, struct timespec *, int);
1586 int (*atomic_open)(struct inode *, struct dentry *,
1587 struct file *, unsigned open_flag,
1588 umode_t create_mode, int *opened);
1589 int (*tmpfile) (struct inode *, struct dentry *, umode_t);
1590 } ____cacheline_aligned;
1592 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1593 unsigned long nr_segs, unsigned long fast_segs,
1594 struct iovec *fast_pointer,
1595 struct iovec **ret_pointer);
1597 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1598 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1599 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1600 unsigned long, loff_t *);
1601 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1602 unsigned long, loff_t *);
1604 struct super_operations {
1605 struct inode *(*alloc_inode)(struct super_block *sb);
1606 void (*destroy_inode)(struct inode *);
1608 void (*dirty_inode) (struct inode *, int flags);
1609 int (*write_inode) (struct inode *, struct writeback_control *wbc);
1610 int (*drop_inode) (struct inode *);
1611 void (*evict_inode) (struct inode *);
1612 void (*put_super) (struct super_block *);
1613 int (*sync_fs)(struct super_block *sb, int wait);
1614 int (*freeze_fs) (struct super_block *);
1615 int (*unfreeze_fs) (struct super_block *);
1616 int (*statfs) (struct dentry *, struct kstatfs *);
1617 int (*remount_fs) (struct super_block *, int *, char *);
1618 void (*umount_begin) (struct super_block *);
1620 int (*show_options)(struct seq_file *, struct dentry *);
1621 int (*show_devname)(struct seq_file *, struct dentry *);
1622 int (*show_path)(struct seq_file *, struct dentry *);
1623 int (*show_stats)(struct seq_file *, struct dentry *);
1625 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1626 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1628 int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
1629 int (*nr_cached_objects)(struct super_block *);
1630 void (*free_cached_objects)(struct super_block *, int);
1634 * Inode flags - they have no relation to superblock flags now
1636 #define S_SYNC 1 /* Writes are synced at once */
1637 #define S_NOATIME 2 /* Do not update access times */
1638 #define S_APPEND 4 /* Append-only file */
1639 #define S_IMMUTABLE 8 /* Immutable file */
1640 #define S_DEAD 16 /* removed, but still open directory */
1641 #define S_NOQUOTA 32 /* Inode is not counted to quota */
1642 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
1643 #define S_NOCMTIME 128 /* Do not update file c/mtime */
1644 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
1645 #define S_PRIVATE 512 /* Inode is fs-internal */
1646 #define S_IMA 1024 /* Inode has an associated IMA struct */
1647 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
1648 #define S_NOSEC 4096 /* no suid or xattr security attributes */
1651 * Note that nosuid etc flags are inode-specific: setting some file-system
1652 * flags just means all the inodes inherit those flags by default. It might be
1653 * possible to override it selectively if you really wanted to with some
1654 * ioctl() that is not currently implemented.
1656 * Exception: MS_RDONLY is always applied to the entire file system.
1658 * Unfortunately, it is possible to change a filesystems flags with it mounted
1659 * with files in use. This means that all of the inodes will not have their
1660 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
1661 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
1663 #define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg))
1665 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
1666 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
1667 ((inode)->i_flags & S_SYNC))
1668 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
1669 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
1670 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
1671 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
1672 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
1674 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
1675 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
1676 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
1677 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
1679 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
1680 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
1681 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
1682 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
1683 #define IS_IMA(inode) ((inode)->i_flags & S_IMA)
1684 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT)
1685 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
1688 * Inode state bits. Protected by inode->i_lock
1690 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1691 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1693 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1694 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1695 * various stages of removing an inode.
1697 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
1699 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1700 * fdatasync(). i_atime is the usual cause.
1701 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1702 * these changes separately from I_DIRTY_SYNC so that we
1703 * don't have to write inode on fdatasync() when only
1704 * mtime has changed in it.
1705 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1706 * I_NEW Serves as both a mutex and completion notification.
1707 * New inodes set I_NEW. If two processes both create
1708 * the same inode, one of them will release its inode and
1709 * wait for I_NEW to be released before returning.
1710 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1711 * also cause waiting on I_NEW, without I_NEW actually
1712 * being set. find_inode() uses this to prevent returning
1713 * nearly-dead inodes.
1714 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1715 * is zero. I_FREEING must be set when I_WILL_FREE is
1717 * I_FREEING Set when inode is about to be freed but still has dirty
1718 * pages or buffers attached or the inode itself is still
1720 * I_CLEAR Added by clear_inode(). In this state the inode is
1721 * clean and can be destroyed. Inode keeps I_FREEING.
1723 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1724 * prohibited for many purposes. iget() must wait for
1725 * the inode to be completely released, then create it
1726 * anew. Other functions will just ignore such inodes,
1727 * if appropriate. I_NEW is used for waiting.
1729 * I_SYNC Writeback of inode is running. The bit is set during
1730 * data writeback, and cleared with a wakeup on the bit
1731 * address once it is done. The bit is also used to pin
1732 * the inode in memory for flusher thread.
1734 * I_REFERENCED Marks the inode as recently references on the LRU list.
1736 * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit().
1738 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1740 #define I_DIRTY_SYNC (1 << 0)
1741 #define I_DIRTY_DATASYNC (1 << 1)
1742 #define I_DIRTY_PAGES (1 << 2)
1744 #define I_NEW (1 << __I_NEW)
1745 #define I_WILL_FREE (1 << 4)
1746 #define I_FREEING (1 << 5)
1747 #define I_CLEAR (1 << 6)
1749 #define I_SYNC (1 << __I_SYNC)
1750 #define I_REFERENCED (1 << 8)
1751 #define __I_DIO_WAKEUP 9
1752 #define I_DIO_WAKEUP (1 << I_DIO_WAKEUP)
1753 #define I_LINKABLE (1 << 10)
1755 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1757 extern void __mark_inode_dirty(struct inode *, int);
1758 static inline void mark_inode_dirty(struct inode *inode)
1760 __mark_inode_dirty(inode, I_DIRTY);
1763 static inline void mark_inode_dirty_sync(struct inode *inode)
1765 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1768 extern void inc_nlink(struct inode *inode);
1769 extern void drop_nlink(struct inode *inode);
1770 extern void clear_nlink(struct inode *inode);
1771 extern void set_nlink(struct inode *inode, unsigned int nlink);
1773 static inline void inode_inc_link_count(struct inode *inode)
1776 mark_inode_dirty(inode);
1779 static inline void inode_dec_link_count(struct inode *inode)
1782 mark_inode_dirty(inode);
1786 * inode_inc_iversion - increments i_version
1787 * @inode: inode that need to be updated
1789 * Every time the inode is modified, the i_version field will be incremented.
1790 * The filesystem has to be mounted with i_version flag
1793 static inline void inode_inc_iversion(struct inode *inode)
1795 spin_lock(&inode->i_lock);
1797 spin_unlock(&inode->i_lock);
1800 enum file_time_flags {
1807 extern void touch_atime(struct path *);
1808 static inline void file_accessed(struct file *file)
1810 if (!(file->f_flags & O_NOATIME))
1811 touch_atime(&file->f_path);
1814 int sync_inode(struct inode *inode, struct writeback_control *wbc);
1815 int sync_inode_metadata(struct inode *inode, int wait);
1817 struct file_system_type {
1820 #define FS_REQUIRES_DEV 1
1821 #define FS_BINARY_MOUNTDATA 2
1822 #define FS_HAS_SUBTYPE 4
1823 #define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */
1824 #define FS_USERNS_DEV_MOUNT 16 /* A userns mount does not imply MNT_NODEV */
1825 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */
1826 struct dentry *(*mount) (struct file_system_type *, int,
1827 const char *, void *);
1828 void (*kill_sb) (struct super_block *);
1829 struct module *owner;
1830 struct file_system_type * next;
1831 struct hlist_head fs_supers;
1833 struct lock_class_key s_lock_key;
1834 struct lock_class_key s_umount_key;
1835 struct lock_class_key s_vfs_rename_key;
1836 struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];
1838 struct lock_class_key i_lock_key;
1839 struct lock_class_key i_mutex_key;
1840 struct lock_class_key i_mutex_dir_key;
1843 #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)
1845 extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags,
1846 void *data, int (*fill_super)(struct super_block *, void *, int));
1847 extern struct dentry *mount_bdev(struct file_system_type *fs_type,
1848 int flags, const char *dev_name, void *data,
1849 int (*fill_super)(struct super_block *, void *, int));
1850 extern struct dentry *mount_single(struct file_system_type *fs_type,
1851 int flags, void *data,
1852 int (*fill_super)(struct super_block *, void *, int));
1853 extern struct dentry *mount_nodev(struct file_system_type *fs_type,
1854 int flags, void *data,
1855 int (*fill_super)(struct super_block *, void *, int));
1856 extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
1857 void generic_shutdown_super(struct super_block *sb);
1858 void kill_block_super(struct super_block *sb);
1859 void kill_anon_super(struct super_block *sb);
1860 void kill_litter_super(struct super_block *sb);
1861 void deactivate_super(struct super_block *sb);
1862 void deactivate_locked_super(struct super_block *sb);
1863 int set_anon_super(struct super_block *s, void *data);
1864 int get_anon_bdev(dev_t *);
1865 void free_anon_bdev(dev_t);
1866 struct super_block *sget(struct file_system_type *type,
1867 int (*test)(struct super_block *,void *),
1868 int (*set)(struct super_block *,void *),
1869 int flags, void *data);
1870 extern struct dentry *mount_pseudo(struct file_system_type *, char *,
1871 const struct super_operations *ops,
1872 const struct dentry_operations *dops,
1875 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1876 #define fops_get(fops) \
1877 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1878 #define fops_put(fops) \
1879 do { if (fops) module_put((fops)->owner); } while(0)
1881 extern int register_filesystem(struct file_system_type *);
1882 extern int unregister_filesystem(struct file_system_type *);
1883 extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
1884 #define kern_mount(type) kern_mount_data(type, NULL)
1885 extern void kern_unmount(struct vfsmount *mnt);
1886 extern int may_umount_tree(struct vfsmount *);
1887 extern int may_umount(struct vfsmount *);
1888 extern long do_mount(const char *, const char *, const char *, unsigned long, void *);
1889 extern struct vfsmount *collect_mounts(struct path *);
1890 extern void drop_collected_mounts(struct vfsmount *);
1891 extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
1893 extern int vfs_statfs(struct path *, struct kstatfs *);
1894 extern int user_statfs(const char __user *, struct kstatfs *);
1895 extern int fd_statfs(int, struct kstatfs *);
1896 extern int vfs_ustat(dev_t, struct kstatfs *);
1897 extern int freeze_super(struct super_block *super);
1898 extern int thaw_super(struct super_block *super);
1899 extern bool our_mnt(struct vfsmount *mnt);
1900 extern bool fs_fully_visible(struct file_system_type *);
1902 extern int current_umask(void);
1905 extern struct kobject *fs_kobj;
1907 #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1909 #define FLOCK_VERIFY_READ 1
1910 #define FLOCK_VERIFY_WRITE 2
1912 #ifdef CONFIG_FILE_LOCKING
1913 extern int locks_mandatory_locked(struct inode *);
1914 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1917 * Candidates for mandatory locking have the setgid bit set
1918 * but no group execute bit - an otherwise meaningless combination.
1921 static inline int __mandatory_lock(struct inode *ino)
1923 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1927 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1928 * otherwise these will be advisory locks
1931 static inline int mandatory_lock(struct inode *ino)
1933 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1936 static inline int locks_verify_locked(struct inode *inode)
1938 if (mandatory_lock(inode))
1939 return locks_mandatory_locked(inode);
1943 static inline int locks_verify_truncate(struct inode *inode,
1947 if (inode->i_flock && mandatory_lock(inode))
1948 return locks_mandatory_area(
1949 FLOCK_VERIFY_WRITE, inode, filp,
1950 size < inode->i_size ? size : inode->i_size,
1951 (size < inode->i_size ? inode->i_size - size
1952 : size - inode->i_size)
1957 static inline int break_lease(struct inode *inode, unsigned int mode)
1960 return __break_lease(inode, mode);
1963 #else /* !CONFIG_FILE_LOCKING */
1964 static inline int locks_mandatory_locked(struct inode *inode)
1969 static inline int locks_mandatory_area(int rw, struct inode *inode,
1970 struct file *filp, loff_t offset,
1976 static inline int __mandatory_lock(struct inode *inode)
1981 static inline int mandatory_lock(struct inode *inode)
1986 static inline int locks_verify_locked(struct inode *inode)
1991 static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
1997 static inline int break_lease(struct inode *inode, unsigned int mode)
2002 #endif /* CONFIG_FILE_LOCKING */
2007 const char *name; /* pointer to actual string */
2008 const __user char *uptr; /* original userland pointer */
2009 struct audit_names *aname;
2010 bool separate; /* should "name" be freed? */
2013 extern long vfs_truncate(struct path *, loff_t);
2014 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
2016 extern int do_fallocate(struct file *file, int mode, loff_t offset,
2018 extern long do_sys_open(int dfd, const char __user *filename, int flags,
2020 extern struct file *file_open_name(struct filename *, int, umode_t);
2021 extern struct file *filp_open(const char *, int, umode_t);
2022 extern struct file *file_open_root(struct dentry *, struct vfsmount *,
2024 extern struct file * dentry_open(const struct path *, int, const struct cred *);
2025 extern int filp_close(struct file *, fl_owner_t id);
2027 extern struct filename *getname(const char __user *);
2033 extern int finish_open(struct file *file, struct dentry *dentry,
2034 int (*open)(struct inode *, struct file *),
2036 extern int finish_no_open(struct file *file, struct dentry *dentry);
2040 extern int ioctl_preallocate(struct file *filp, void __user *argp);
2043 extern void __init vfs_caches_init_early(void);
2044 extern void __init vfs_caches_init(unsigned long);
2046 extern struct kmem_cache *names_cachep;
2048 extern void final_putname(struct filename *name);
2050 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
2051 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
2052 #ifndef CONFIG_AUDITSYSCALL
2053 #define putname(name) final_putname(name)
2055 extern void putname(struct filename *name);
2059 extern int register_blkdev(unsigned int, const char *);
2060 extern void unregister_blkdev(unsigned int, const char *);
2061 extern struct block_device *bdget(dev_t);
2062 extern struct block_device *bdgrab(struct block_device *bdev);
2063 extern void bd_set_size(struct block_device *, loff_t size);
2064 extern void bd_forget(struct inode *inode);
2065 extern void bdput(struct block_device *);
2066 extern void invalidate_bdev(struct block_device *);
2067 extern void iterate_bdevs(void (*)(struct block_device *, void *), void *);
2068 extern int sync_blockdev(struct block_device *bdev);
2069 extern void kill_bdev(struct block_device *);
2070 extern struct super_block *freeze_bdev(struct block_device *);
2071 extern void emergency_thaw_all(void);
2072 extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
2073 extern int fsync_bdev(struct block_device *);
2075 static inline void bd_forget(struct inode *inode) {}
2076 static inline int sync_blockdev(struct block_device *bdev) { return 0; }
2077 static inline void kill_bdev(struct block_device *bdev) {}
2078 static inline void invalidate_bdev(struct block_device *bdev) {}
2080 static inline struct super_block *freeze_bdev(struct block_device *sb)
2085 static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
2090 static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg)
2094 extern int sync_filesystem(struct super_block *);
2095 extern const struct file_operations def_blk_fops;
2096 extern const struct file_operations def_chr_fops;
2097 extern const struct file_operations bad_sock_fops;
2099 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
2100 extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
2101 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
2102 extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
2103 extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
2105 extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
2107 extern void blkdev_put(struct block_device *bdev, fmode_t mode);
2109 extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
2110 extern void bd_unlink_disk_holder(struct block_device *bdev,
2111 struct gendisk *disk);
2113 static inline int bd_link_disk_holder(struct block_device *bdev,
2114 struct gendisk *disk)
2118 static inline void bd_unlink_disk_holder(struct block_device *bdev,
2119 struct gendisk *disk)
2126 #define CHRDEV_MAJOR_HASH_SIZE 255
2127 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
2128 extern int register_chrdev_region(dev_t, unsigned, const char *);
2129 extern int __register_chrdev(unsigned int major, unsigned int baseminor,
2130 unsigned int count, const char *name,
2131 const struct file_operations *fops);
2132 extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
2133 unsigned int count, const char *name);
2134 extern void unregister_chrdev_region(dev_t, unsigned);
2135 extern void chrdev_show(struct seq_file *,off_t);
2137 static inline int register_chrdev(unsigned int major, const char *name,
2138 const struct file_operations *fops)
2140 return __register_chrdev(major, 0, 256, name, fops);
2143 static inline void unregister_chrdev(unsigned int major, const char *name)
2145 __unregister_chrdev(major, 0, 256, name);
2148 /* fs/block_dev.c */
2149 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
2150 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
2153 #define BLKDEV_MAJOR_HASH_SIZE 255
2154 extern const char *__bdevname(dev_t, char *buffer);
2155 extern const char *bdevname(struct block_device *bdev, char *buffer);
2156 extern struct block_device *lookup_bdev(const char *);
2157 extern void blkdev_show(struct seq_file *,off_t);
2160 #define BLKDEV_MAJOR_HASH_SIZE 0
2163 extern void init_special_inode(struct inode *, umode_t, dev_t);
2165 /* Invalid inode operations -- fs/bad_inode.c */
2166 extern void make_bad_inode(struct inode *);
2167 extern int is_bad_inode(struct inode *);
2171 * return READ, READA, or WRITE
2173 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
2176 * return data direction, READ or WRITE
2178 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
2180 extern void check_disk_size_change(struct gendisk *disk,
2181 struct block_device *bdev);
2182 extern int revalidate_disk(struct gendisk *);
2183 extern int check_disk_change(struct block_device *);
2184 extern int __invalidate_device(struct block_device *, bool);
2185 extern int invalidate_partition(struct gendisk *, int);
2187 unsigned long invalidate_mapping_pages(struct address_space *mapping,
2188 pgoff_t start, pgoff_t end);
2190 static inline void invalidate_remote_inode(struct inode *inode)
2192 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
2193 S_ISLNK(inode->i_mode))
2194 invalidate_mapping_pages(inode->i_mapping, 0, -1);
2196 extern int invalidate_inode_pages2(struct address_space *mapping);
2197 extern int invalidate_inode_pages2_range(struct address_space *mapping,
2198 pgoff_t start, pgoff_t end);
2199 extern int write_inode_now(struct inode *, int);
2200 extern int filemap_fdatawrite(struct address_space *);
2201 extern int filemap_flush(struct address_space *);
2202 extern int filemap_fdatawait(struct address_space *);
2203 extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
2205 extern int filemap_write_and_wait(struct address_space *mapping);
2206 extern int filemap_write_and_wait_range(struct address_space *mapping,
2207 loff_t lstart, loff_t lend);
2208 extern int __filemap_fdatawrite_range(struct address_space *mapping,
2209 loff_t start, loff_t end, int sync_mode);
2210 extern int filemap_fdatawrite_range(struct address_space *mapping,
2211 loff_t start, loff_t end);
2213 extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
2215 extern int vfs_fsync(struct file *file, int datasync);
2216 extern int generic_write_sync(struct file *file, loff_t pos, loff_t count);
2217 extern void emergency_sync(void);
2218 extern void emergency_remount(void);
2220 extern sector_t bmap(struct inode *, sector_t);
2222 extern int notify_change(struct dentry *, struct iattr *);
2223 extern int inode_permission(struct inode *, int);
2224 extern int generic_permission(struct inode *, int);
2226 static inline bool execute_ok(struct inode *inode)
2228 return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
2231 static inline struct inode *file_inode(struct file *f)
2236 static inline void file_start_write(struct file *file)
2238 if (!S_ISREG(file_inode(file)->i_mode))
2240 __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true);
2243 static inline bool file_start_write_trylock(struct file *file)
2245 if (!S_ISREG(file_inode(file)->i_mode))
2247 return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false);
2250 static inline void file_end_write(struct file *file)
2252 if (!S_ISREG(file_inode(file)->i_mode))
2254 __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE);
2258 * get_write_access() gets write permission for a file.
2259 * put_write_access() releases this write permission.
2260 * This is used for regular files.
2261 * We cannot support write (and maybe mmap read-write shared) accesses and
2262 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
2263 * can have the following values:
2264 * 0: no writers, no VM_DENYWRITE mappings
2265 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
2266 * > 0: (i_writecount) users are writing to the file.
2268 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
2269 * except for the cases where we don't hold i_writecount yet. Then we need to
2270 * use {get,deny}_write_access() - these functions check the sign and refuse
2271 * to do the change if sign is wrong.
2273 static inline int get_write_access(struct inode *inode)
2275 return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY;
2277 static inline int deny_write_access(struct file *file)
2279 struct inode *inode = file_inode(file);
2280 return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
2282 static inline void put_write_access(struct inode * inode)
2284 atomic_dec(&inode->i_writecount);
2286 static inline void allow_write_access(struct file *file)
2289 atomic_inc(&file_inode(file)->i_writecount);
2292 static inline void i_readcount_dec(struct inode *inode)
2294 BUG_ON(!atomic_read(&inode->i_readcount));
2295 atomic_dec(&inode->i_readcount);
2297 static inline void i_readcount_inc(struct inode *inode)
2299 atomic_inc(&inode->i_readcount);
2302 static inline void i_readcount_dec(struct inode *inode)
2306 static inline void i_readcount_inc(struct inode *inode)
2311 extern int do_pipe_flags(int *, int);
2313 extern int kernel_read(struct file *, loff_t, char *, unsigned long);
2314 extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t);
2315 extern struct file * open_exec(const char *);
2317 /* fs/dcache.c -- generic fs support functions */
2318 extern int is_subdir(struct dentry *, struct dentry *);
2319 extern int path_is_under(struct path *, struct path *);
2321 #include <linux/err.h>
2323 /* needed for stackable file system support */
2324 extern loff_t default_llseek(struct file *file, loff_t offset, int whence);
2326 extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence);
2328 extern int inode_init_always(struct super_block *, struct inode *);
2329 extern void inode_init_once(struct inode *);
2330 extern void address_space_init_once(struct address_space *mapping);
2331 extern void ihold(struct inode * inode);
2332 extern void iput(struct inode *);
2333 extern struct inode * igrab(struct inode *);
2334 extern ino_t iunique(struct super_block *, ino_t);
2335 extern int inode_needs_sync(struct inode *inode);
2336 extern int generic_delete_inode(struct inode *inode);
2337 static inline int generic_drop_inode(struct inode *inode)
2339 return !inode->i_nlink || inode_unhashed(inode);
2342 extern struct inode *ilookup5_nowait(struct super_block *sb,
2343 unsigned long hashval, int (*test)(struct inode *, void *),
2345 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
2346 int (*test)(struct inode *, void *), void *data);
2347 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
2349 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
2350 extern struct inode * iget_locked(struct super_block *, unsigned long);
2351 extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
2352 extern int insert_inode_locked(struct inode *);
2353 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2354 extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
2356 static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
2358 extern void unlock_new_inode(struct inode *);
2359 extern unsigned int get_next_ino(void);
2361 extern void __iget(struct inode * inode);
2362 extern void iget_failed(struct inode *);
2363 extern void clear_inode(struct inode *);
2364 extern void __destroy_inode(struct inode *);
2365 extern struct inode *new_inode_pseudo(struct super_block *sb);
2366 extern struct inode *new_inode(struct super_block *sb);
2367 extern void free_inode_nonrcu(struct inode *inode);
2368 extern int should_remove_suid(struct dentry *);
2369 extern int file_remove_suid(struct file *);
2371 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
2372 static inline void insert_inode_hash(struct inode *inode)
2374 __insert_inode_hash(inode, inode->i_ino);
2377 extern void __remove_inode_hash(struct inode *);
2378 static inline void remove_inode_hash(struct inode *inode)
2380 if (!inode_unhashed(inode))
2381 __remove_inode_hash(inode);
2384 extern void inode_sb_list_add(struct inode *inode);
2387 extern void submit_bio(int, struct bio *);
2388 extern int bdev_read_only(struct block_device *);
2390 extern int set_blocksize(struct block_device *, int);
2391 extern int sb_set_blocksize(struct super_block *, int);
2392 extern int sb_min_blocksize(struct super_block *, int);
2394 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
2395 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
2396 extern int generic_file_remap_pages(struct vm_area_struct *, unsigned long addr,
2397 unsigned long size, pgoff_t pgoff);
2398 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
2399 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
2400 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2401 extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long,
2403 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2404 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
2405 unsigned long *, loff_t, loff_t *, size_t, size_t);
2406 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
2407 unsigned long, loff_t, loff_t *, size_t, ssize_t);
2408 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
2409 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
2410 extern int generic_segment_checks(const struct iovec *iov,
2411 unsigned long *nr_segs, size_t *count, int access_flags);
2413 /* fs/block_dev.c */
2414 extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
2415 unsigned long nr_segs, loff_t pos);
2416 extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
2418 extern void block_sync_page(struct page *page);
2421 extern ssize_t generic_file_splice_read(struct file *, loff_t *,
2422 struct pipe_inode_info *, size_t, unsigned int);
2423 extern ssize_t default_file_splice_read(struct file *, loff_t *,
2424 struct pipe_inode_info *, size_t, unsigned int);
2425 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
2426 struct file *, loff_t *, size_t, unsigned int);
2427 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
2428 struct file *out, loff_t *, size_t len, unsigned int flags);
2431 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
2432 extern loff_t noop_llseek(struct file *file, loff_t offset, int whence);
2433 extern loff_t no_llseek(struct file *file, loff_t offset, int whence);
2434 extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize);
2435 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence);
2436 extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
2437 int whence, loff_t maxsize, loff_t eof);
2438 extern loff_t fixed_size_llseek(struct file *file, loff_t offset,
2439 int whence, loff_t size);
2440 extern int generic_file_open(struct inode * inode, struct file * filp);
2441 extern int nonseekable_open(struct inode * inode, struct file * filp);
2443 #ifdef CONFIG_FS_XIP
2444 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
2446 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
2447 extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
2448 size_t len, loff_t *ppos);
2449 extern int xip_truncate_page(struct address_space *mapping, loff_t from);
2451 static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
2458 typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
2459 loff_t file_offset);
2462 /* need locking between buffered and direct access */
2465 /* filesystem does not support filling holes */
2466 DIO_SKIP_HOLES = 0x02,
2469 void dio_end_io(struct bio *bio, int error);
2471 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
2472 struct block_device *bdev, const struct iovec *iov, loff_t offset,
2473 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
2474 dio_submit_t submit_io, int flags);
2476 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
2477 struct inode *inode, const struct iovec *iov, loff_t offset,
2478 unsigned long nr_segs, get_block_t get_block)
2480 return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2481 offset, nr_segs, get_block, NULL, NULL,
2482 DIO_LOCKING | DIO_SKIP_HOLES);
2486 void inode_dio_wait(struct inode *inode);
2487 void inode_dio_done(struct inode *inode);
2489 extern const struct file_operations generic_ro_fops;
2491 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
2493 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
2494 extern int vfs_follow_link(struct nameidata *, const char *);
2495 extern int page_readlink(struct dentry *, char __user *, int);
2496 extern void *page_follow_link_light(struct dentry *, struct nameidata *);
2497 extern void page_put_link(struct dentry *, struct nameidata *, void *);
2498 extern int __page_symlink(struct inode *inode, const char *symname, int len,
2500 extern int page_symlink(struct inode *inode, const char *symname, int len);
2501 extern const struct inode_operations page_symlink_inode_operations;
2502 extern int generic_readlink(struct dentry *, char __user *, int);
2503 extern void generic_fillattr(struct inode *, struct kstat *);
2504 extern int vfs_getattr(struct path *, struct kstat *);
2505 void __inode_add_bytes(struct inode *inode, loff_t bytes);
2506 void inode_add_bytes(struct inode *inode, loff_t bytes);
2507 void inode_sub_bytes(struct inode *inode, loff_t bytes);
2508 loff_t inode_get_bytes(struct inode *inode);
2509 void inode_set_bytes(struct inode *inode, loff_t bytes);
2511 extern int vfs_readdir(struct file *, filldir_t, void *);
2512 extern int iterate_dir(struct file *, struct dir_context *);
2514 extern int vfs_stat(const char __user *, struct kstat *);
2515 extern int vfs_lstat(const char __user *, struct kstat *);
2516 extern int vfs_fstat(unsigned int, struct kstat *);
2517 extern int vfs_fstatat(int , const char __user *, struct kstat *, int);
2519 extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
2521 extern int __generic_block_fiemap(struct inode *inode,
2522 struct fiemap_extent_info *fieinfo,
2523 loff_t start, loff_t len,
2524 get_block_t *get_block);
2525 extern int generic_block_fiemap(struct inode *inode,
2526 struct fiemap_extent_info *fieinfo, u64 start,
2527 u64 len, get_block_t *get_block);
2529 extern void get_filesystem(struct file_system_type *fs);
2530 extern void put_filesystem(struct file_system_type *fs);
2531 extern struct file_system_type *get_fs_type(const char *name);
2532 extern struct super_block *get_super(struct block_device *);
2533 extern struct super_block *get_super_thawed(struct block_device *);
2534 extern struct super_block *get_active_super(struct block_device *bdev);
2535 extern void drop_super(struct super_block *sb);
2536 extern void iterate_supers(void (*)(struct super_block *, void *), void *);
2537 extern void iterate_supers_type(struct file_system_type *,
2538 void (*)(struct super_block *, void *), void *);
2540 extern int dcache_dir_open(struct inode *, struct file *);
2541 extern int dcache_dir_close(struct inode *, struct file *);
2542 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
2543 extern int dcache_readdir(struct file *, struct dir_context *);
2544 extern int simple_setattr(struct dentry *, struct iattr *);
2545 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2546 extern int simple_statfs(struct dentry *, struct kstatfs *);
2547 extern int simple_open(struct inode *inode, struct file *file);
2548 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
2549 extern int simple_unlink(struct inode *, struct dentry *);
2550 extern int simple_rmdir(struct inode *, struct dentry *);
2551 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2552 extern int noop_fsync(struct file *, loff_t, loff_t, int);
2553 extern int simple_empty(struct dentry *);
2554 extern int simple_readpage(struct file *file, struct page *page);
2555 extern int simple_write_begin(struct file *file, struct address_space *mapping,
2556 loff_t pos, unsigned len, unsigned flags,
2557 struct page **pagep, void **fsdata);
2558 extern int simple_write_end(struct file *file, struct address_space *mapping,
2559 loff_t pos, unsigned len, unsigned copied,
2560 struct page *page, void *fsdata);
2562 extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
2563 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
2564 extern const struct file_operations simple_dir_operations;
2565 extern const struct inode_operations simple_dir_inode_operations;
2566 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
2567 struct dentry *d_alloc_name(struct dentry *, const char *);
2568 extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
2569 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
2570 extern void simple_release_fs(struct vfsmount **mount, int *count);
2572 extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
2573 loff_t *ppos, const void *from, size_t available);
2574 extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
2575 const void __user *from, size_t count);
2577 extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
2579 extern int generic_check_addressable(unsigned, u64);
2581 #ifdef CONFIG_MIGRATION
2582 extern int buffer_migrate_page(struct address_space *,
2583 struct page *, struct page *,
2586 #define buffer_migrate_page NULL
2589 extern int inode_change_ok(const struct inode *, struct iattr *);
2590 extern int inode_newsize_ok(const struct inode *, loff_t offset);
2591 extern void setattr_copy(struct inode *inode, const struct iattr *attr);
2593 extern int file_update_time(struct file *file);
2595 extern int generic_show_options(struct seq_file *m, struct dentry *root);
2596 extern void save_mount_options(struct super_block *sb, char *options);
2597 extern void replace_mount_options(struct super_block *sb, char *options);
2599 static inline ino_t parent_ino(struct dentry *dentry)
2604 * Don't strictly need d_lock here? If the parent ino could change
2605 * then surely we'd have a deeper race in the caller?
2607 spin_lock(&dentry->d_lock);
2608 res = dentry->d_parent->d_inode->i_ino;
2609 spin_unlock(&dentry->d_lock);
2613 /* Transaction based IO helpers */
2616 * An argresp is stored in an allocated page and holds the
2617 * size of the argument or response, along with its content
2619 struct simple_transaction_argresp {
2624 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2626 char *simple_transaction_get(struct file *file, const char __user *buf,
2628 ssize_t simple_transaction_read(struct file *file, char __user *buf,
2629 size_t size, loff_t *pos);
2630 int simple_transaction_release(struct inode *inode, struct file *file);
2632 void simple_transaction_set(struct file *file, size_t n);
2635 * simple attribute files
2637 * These attributes behave similar to those in sysfs:
2639 * Writing to an attribute immediately sets a value, an open file can be
2640 * written to multiple times.
2642 * Reading from an attribute creates a buffer from the value that might get
2643 * read with multiple read calls. When the attribute has been read
2644 * completely, no further read calls are possible until the file is opened
2647 * All attributes contain a text representation of a numeric value
2648 * that are accessed with the get() and set() functions.
2650 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2651 static int __fops ## _open(struct inode *inode, struct file *file) \
2653 __simple_attr_check_format(__fmt, 0ull); \
2654 return simple_attr_open(inode, file, __get, __set, __fmt); \
2656 static const struct file_operations __fops = { \
2657 .owner = THIS_MODULE, \
2658 .open = __fops ## _open, \
2659 .release = simple_attr_release, \
2660 .read = simple_attr_read, \
2661 .write = simple_attr_write, \
2662 .llseek = generic_file_llseek, \
2665 static inline __printf(1, 2)
2666 void __simple_attr_check_format(const char *fmt, ...)
2668 /* don't do anything, just let the compiler check the arguments; */
2671 int simple_attr_open(struct inode *inode, struct file *file,
2672 int (*get)(void *, u64 *), int (*set)(void *, u64),
2674 int simple_attr_release(struct inode *inode, struct file *file);
2675 ssize_t simple_attr_read(struct file *file, char __user *buf,
2676 size_t len, loff_t *ppos);
2677 ssize_t simple_attr_write(struct file *file, const char __user *buf,
2678 size_t len, loff_t *ppos);
2681 int proc_nr_files(struct ctl_table *table, int write,
2682 void __user *buffer, size_t *lenp, loff_t *ppos);
2683 int proc_nr_dentry(struct ctl_table *table, int write,
2684 void __user *buffer, size_t *lenp, loff_t *ppos);
2685 int proc_nr_inodes(struct ctl_table *table, int write,
2686 void __user *buffer, size_t *lenp, loff_t *ppos);
2687 int __init get_filesystem_list(char *buf);
2689 #define __FMODE_EXEC ((__force int) FMODE_EXEC)
2690 #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY)
2692 #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
2693 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2694 (flag & __FMODE_NONOTIFY)))
2696 static inline int is_sxid(umode_t mode)
2698 return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
2701 static inline void inode_has_no_xattr(struct inode *inode)
2703 if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC))
2704 inode->i_flags |= S_NOSEC;
2707 static inline bool dir_emit(struct dir_context *ctx,
2708 const char *name, int namelen,
2709 u64 ino, unsigned type)
2711 return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0;
2713 static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx)
2715 return ctx->actor(ctx, ".", 1, ctx->pos,
2716 file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0;
2718 static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx)
2720 return ctx->actor(ctx, "..", 2, ctx->pos,
2721 parent_ino(file->f_path.dentry), DT_DIR) == 0;
2723 static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
2725 if (ctx->pos == 0) {
2726 if (!dir_emit_dot(file, ctx))
2730 if (ctx->pos == 1) {
2731 if (!dir_emit_dotdot(file, ctx))
2737 static inline bool dir_relax(struct inode *inode)
2739 mutex_unlock(&inode->i_mutex);
2740 mutex_lock(&inode->i_mutex);
2741 return !IS_DEADDIR(inode);
2744 #endif /* _LINUX_FS_H */