fs.h 100.6 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7
#ifndef _LINUX_FS_H
#define _LINUX_FS_H

#include <linux/linkage.h>
#include <linux/wait.h>
#include <linux/kdev_t.h>
#include <linux/dcache.h>
8
#include <linux/path.h>
L
Linus Torvalds 已提交
9 10 11
#include <linux/stat.h>
#include <linux/cache.h>
#include <linux/list.h>
12
#include <linux/list_lru.h>
13
#include <linux/llist.h>
L
Linus Torvalds 已提交
14
#include <linux/radix-tree.h>
15
#include <linux/rbtree.h>
L
Linus Torvalds 已提交
16
#include <linux/init.h>
17
#include <linux/pid.h>
18
#include <linux/bug.h>
19
#include <linux/mutex.h>
20
#include <linux/rwsem.h>
21
#include <linux/capability.h>
22
#include <linux/semaphore.h>
M
Mark Fasheh 已提交
23
#include <linux/fiemap.h>
24
#include <linux/rculist_bl.h>
25
#include <linux/atomic.h>
26
#include <linux/shrinker.h>
27
#include <linux/migrate_mode.h>
28
#include <linux/uidgid.h>
29
#include <linux/lockdep.h>
30
#include <linux/percpu-rwsem.h>
D
David Howells 已提交
31
#include <linux/blk_types.h>
32
#include <linux/workqueue.h>
33
#include <linux/percpu-rwsem.h>
34
#include <linux/delayed_call.h>
L
Linus Torvalds 已提交
35 36

#include <asm/byteorder.h>
37
#include <uapi/linux/fs.h>
L
Linus Torvalds 已提交
38

39
struct backing_dev_info;
40
struct bdi_writeback;
41
struct export_operations;
42
struct hd_geometry;
L
Linus Torvalds 已提交
43
struct iovec;
44
struct kiocb;
A
Alexey Dobriyan 已提交
45
struct kobject;
L
Linus Torvalds 已提交
46 47 48 49 50
struct pipe_inode_info;
struct poll_table_struct;
struct kstatfs;
struct vm_area_struct;
struct vfsmount;
51
struct cred;
52
struct swap_info_struct;
53
struct seq_file;
54
struct workqueue_struct;
55
struct iov_iter;
L
Linus Torvalds 已提交
56

57
extern void __init inode_init(void);
L
Linus Torvalds 已提交
58
extern void __init inode_init_early(void);
59 60
extern void __init files_init(void);
extern void __init files_maxfiles_init(void);
L
Linus Torvalds 已提交
61

62
extern struct files_stat_struct files_stat;
E
Eric Dumazet 已提交
63
extern unsigned long get_max_files(void);
64 65 66
extern int sysctl_nr_open;
extern struct inodes_stat_t inodes_stat;
extern int leases_enable, lease_break_time;
K
Kees Cook 已提交
67 68
extern int sysctl_protected_symlinks;
extern int sysctl_protected_hardlinks;
69

L
Linus Torvalds 已提交
70 71 72
struct buffer_head;
typedef int (get_block_t)(struct inode *inode, sector_t iblock,
			struct buffer_head *bh_result, int create);
73
typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
74
			ssize_t bytes, void *private);
75
typedef void (dax_iodone_t)(struct buffer_head *bh_map, int uptodate);
L
Linus Torvalds 已提交
76

D
David Howells 已提交
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132
#define MAY_EXEC		0x00000001
#define MAY_WRITE		0x00000002
#define MAY_READ		0x00000004
#define MAY_APPEND		0x00000008
#define MAY_ACCESS		0x00000010
#define MAY_OPEN		0x00000020
#define MAY_CHDIR		0x00000040
/* called from RCU mode, don't block */
#define MAY_NOT_BLOCK		0x00000080

/*
 * flags in file.f_mode.  Note that FMODE_READ and FMODE_WRITE must correspond
 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
 */

/* file is open for reading */
#define FMODE_READ		((__force fmode_t)0x1)
/* file is open for writing */
#define FMODE_WRITE		((__force fmode_t)0x2)
/* file is seekable */
#define FMODE_LSEEK		((__force fmode_t)0x4)
/* file can be accessed using pread */
#define FMODE_PREAD		((__force fmode_t)0x8)
/* file can be accessed using pwrite */
#define FMODE_PWRITE		((__force fmode_t)0x10)
/* File is opened for execution with sys_execve / sys_uselib */
#define FMODE_EXEC		((__force fmode_t)0x20)
/* File is opened with O_NDELAY (only set for block devices) */
#define FMODE_NDELAY		((__force fmode_t)0x40)
/* File is opened with O_EXCL (only set for block devices) */
#define FMODE_EXCL		((__force fmode_t)0x80)
/* File is opened using open(.., 3, ..) and is writeable only for ioctls
   (specialy hack for floppy.c) */
#define FMODE_WRITE_IOCTL	((__force fmode_t)0x100)
/* 32bit hashes as llseek() offset (for directories) */
#define FMODE_32BITHASH         ((__force fmode_t)0x200)
/* 64bit hashes as llseek() offset (for directories) */
#define FMODE_64BITHASH         ((__force fmode_t)0x400)

/*
 * Don't update ctime and mtime.
 *
 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
 */
#define FMODE_NOCMTIME		((__force fmode_t)0x800)

/* Expect random access pattern */
#define FMODE_RANDOM		((__force fmode_t)0x1000)

/* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
#define FMODE_UNSIGNED_OFFSET	((__force fmode_t)0x2000)

/* File is opened with O_PATH; almost nothing can be done with it */
#define FMODE_PATH		((__force fmode_t)0x4000)

133 134
/* File needs atomic accesses to f_pos */
#define FMODE_ATOMIC_POS	((__force fmode_t)0x8000)
135 136
/* Write access to underlying fs */
#define FMODE_WRITER		((__force fmode_t)0x10000)
137 138 139 140
/* Has read method(s) */
#define FMODE_CAN_READ          ((__force fmode_t)0x20000)
/* Has write method(s) */
#define FMODE_CAN_WRITE         ((__force fmode_t)0x40000)
141

D
David Howells 已提交
142
/* File was opened by fanotify and shouldn't generate fanotify events */
143
#define FMODE_NONOTIFY		((__force fmode_t)0x4000000)
D
David Howells 已提交
144 145 146 147 148 149 150 151 152

/*
 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
 * that indicates that they should check the contents of the iovec are
 * valid, but not check the memory that the iovec elements
 * points too.
 */
#define CHECK_IOVEC_ONLY -1

D
David Howells 已提交
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208
/*
 * The below are the various read and write types that we support. Some of
 * them include behavioral modifiers that send information down to the
 * block layer and IO scheduler. Terminology:
 *
 *	The block layer uses device plugging to defer IO a little bit, in
 *	the hope that we will see more IO very shortly. This increases
 *	coalescing of adjacent IO and thus reduces the number of IOs we
 *	have to send to the device. It also allows for better queuing,
 *	if the IO isn't mergeable. If the caller is going to be waiting
 *	for the IO, then he must ensure that the device is unplugged so
 *	that the IO is dispatched to the driver.
 *
 *	All IO is handled async in Linux. This is fine for background
 *	writes, but for reads or writes that someone waits for completion
 *	on, we want to notify the block layer and IO scheduler so that they
 *	know about it. That allows them to make better scheduling
 *	decisions. So when the below references 'sync' and 'async', it
 *	is referencing this priority hint.
 *
 * With that in mind, the available types are:
 *
 * READ			A normal read operation. Device will be plugged.
 * READ_SYNC		A synchronous read. Device is not plugged, caller can
 *			immediately wait on this read without caring about
 *			unplugging.
 * READA		Used for read-ahead operations. Lower priority, and the
 *			block layer could (in theory) choose to ignore this
 *			request if it runs into resource problems.
 * WRITE		A normal async write. Device will be plugged.
 * WRITE_SYNC		Synchronous write. Identical to WRITE, but passes down
 *			the hint that someone will be waiting on this IO
 *			shortly. The write equivalent of READ_SYNC.
 * WRITE_ODIRECT	Special case write for O_DIRECT only.
 * WRITE_FLUSH		Like WRITE_SYNC but with preceding cache flush.
 * WRITE_FUA		Like WRITE_SYNC but data is guaranteed to be on
 *			non-volatile media on completion.
 * WRITE_FLUSH_FUA	Combination of WRITE_FLUSH and FUA. The IO is preceded
 *			by a cache flush and data is guaranteed to be on
 *			non-volatile media on completion.
 *
 */
#define RW_MASK			REQ_WRITE
#define RWA_MASK		REQ_RAHEAD

#define READ			0
#define WRITE			RW_MASK
#define READA			RWA_MASK

#define READ_SYNC		(READ | REQ_SYNC)
#define WRITE_SYNC		(WRITE | REQ_SYNC | REQ_NOIDLE)
#define WRITE_ODIRECT		(WRITE | REQ_SYNC)
#define WRITE_FLUSH		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
#define WRITE_FUA		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
#define WRITE_FLUSH_FUA		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)

L
Linus Torvalds 已提交
209 210 211 212
/*
 * Attribute flags.  These should be or-ed together to figure out what
 * has been changed!
 */
213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229
#define ATTR_MODE	(1 << 0)
#define ATTR_UID	(1 << 1)
#define ATTR_GID	(1 << 2)
#define ATTR_SIZE	(1 << 3)
#define ATTR_ATIME	(1 << 4)
#define ATTR_MTIME	(1 << 5)
#define ATTR_CTIME	(1 << 6)
#define ATTR_ATIME_SET	(1 << 7)
#define ATTR_MTIME_SET	(1 << 8)
#define ATTR_FORCE	(1 << 9) /* Not a change, but a change it */
#define ATTR_ATTR_FLAG	(1 << 10)
#define ATTR_KILL_SUID	(1 << 11)
#define ATTR_KILL_SGID	(1 << 12)
#define ATTR_FILE	(1 << 13)
#define ATTR_KILL_PRIV	(1 << 14)
#define ATTR_OPEN	(1 << 15) /* Truncating from open(O_TRUNC) */
#define ATTR_TIMES_SET	(1 << 16)
L
Linus Torvalds 已提交
230

M
Miklos Szeredi 已提交
231 232 233 234 235 236 237
/*
 * Whiteout is represented by a char device.  The following constants define the
 * mode and device number to use.
 */
#define WHITEOUT_MODE 0
#define WHITEOUT_DEV 0

L
Linus Torvalds 已提交
238 239 240 241 242 243 244 245 246 247 248 249
/*
 * This is the Inode Attributes structure, used for notify_change().  It
 * uses the above definitions as flags, to know which values have changed.
 * Also, in this manner, a Filesystem can look at only the values it cares
 * about.  Basically, these are the attributes that the VFS layer can
 * request to change from the FS layer.
 *
 * Derek Atkins <warlord@MIT.EDU> 94-10-20
 */
struct iattr {
	unsigned int	ia_valid;
	umode_t		ia_mode;
250 251
	kuid_t		ia_uid;
	kgid_t		ia_gid;
L
Linus Torvalds 已提交
252 253 254 255
	loff_t		ia_size;
	struct timespec	ia_atime;
	struct timespec	ia_mtime;
	struct timespec	ia_ctime;
256 257

	/*
L
Lucas De Marchi 已提交
258
	 * Not an attribute, but an auxiliary info for filesystems wanting to
259 260 261 262
	 * implement an ftruncate() like method.  NOTE: filesystem should
	 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
	 */
	struct file	*ia_file;
L
Linus Torvalds 已提交
263 264 265 266 267 268 269
};

/*
 * Includes for diskquotas.
 */
#include <linux/quota.h>

270 271 272 273 274 275
/*
 * Maximum number of layers of fs stack.  Needs to be limited to
 * prevent kernel stack overflow
 */
#define FILESYSTEM_MAX_STACK_DEPTH 2

276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293
/** 
 * enum positive_aop_returns - aop return codes with specific semantics
 *
 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
 * 			    completed, that the page is still locked, and
 * 			    should be considered active.  The VM uses this hint
 * 			    to return the page to the active list -- it won't
 * 			    be a candidate for writeback again in the near
 * 			    future.  Other callers must be careful to unlock
 * 			    the page if they get this return.  Returned by
 * 			    writepage(); 
 *
 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
 *  			unlocked it and the page might have been truncated.
 *  			The caller should back up to acquiring a new page and
 *  			trying again.  The aop will be taking reasonable
 *  			precautions not to livelock.  If the caller held a page
 *  			reference, it should drop it before retrying.  Returned
N
Nick Piggin 已提交
294
 *  			by readpage().
295 296 297 298 299 300 301 302 303 304 305 306
 *
 * address_space_operation functions return these large constants to indicate
 * special semantics to the caller.  These are much larger than the bytes in a
 * page to allow for functions that return the number of bytes operated on in a
 * given page.
 */

enum positive_aop_returns {
	AOP_WRITEPAGE_ACTIVATE	= 0x80000,
	AOP_TRUNCATED_PAGE	= 0x80001,
};

307
#define AOP_FLAG_UNINTERRUPTIBLE	0x0001 /* will not do a short write */
N
Nick Piggin 已提交
308
#define AOP_FLAG_CONT_EXPAND		0x0002 /* called from cont_expand */
309 310 311
#define AOP_FLAG_NOFS			0x0004 /* used by filesystem to direct
						* helper code (eg buffer layer)
						* to clear GFP_FS from alloc */
312

L
Linus Torvalds 已提交
313 314 315 316 317 318 319
/*
 * oh the beauties of C type declarations.
 */
struct page;
struct address_space;
struct writeback_control;

320
#define IOCB_EVENTFD		(1 << 0)
321 322
#define IOCB_APPEND		(1 << 1)
#define IOCB_DIRECT		(1 << 2)
323 324 325 326 327 328 329 330 331 332 333 334 335 336

struct kiocb {
	struct file		*ki_filp;
	loff_t			ki_pos;
	void (*ki_complete)(struct kiocb *iocb, long ret, long ret2);
	void			*private;
	int			ki_flags;
};

static inline bool is_sync_kiocb(struct kiocb *kiocb)
{
	return kiocb->ki_complete == NULL;
}

337 338
static inline int iocb_flags(struct file *file);

339 340 341 342
static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
{
	*kiocb = (struct kiocb) {
		.ki_filp = filp,
343
		.ki_flags = iocb_flags(filp),
344 345 346
	};
}

347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367
/*
 * "descriptor" for what we're up to with a read.
 * This allows us to use the same read code yet
 * have multiple different users of the data that
 * we read from a file.
 *
 * The simplest case just copies the data to user
 * mode.
 */
typedef struct {
	size_t written;
	size_t count;
	union {
		char __user *buf;
		void *data;
	} arg;
	int error;
} read_descriptor_t;

typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
		unsigned long, unsigned long);
N
Nick Piggin 已提交
368

L
Linus Torvalds 已提交
369 370 371 372 373 374 375
struct address_space_operations {
	int (*writepage)(struct page *page, struct writeback_control *wbc);
	int (*readpage)(struct file *, struct page *);

	/* Write back some dirty pages from this mapping. */
	int (*writepages)(struct address_space *, struct writeback_control *);

376
	/* Set a page dirty.  Return true if this dirtied it */
L
Linus Torvalds 已提交
377 378 379 380 381
	int (*set_page_dirty)(struct page *page);

	int (*readpages)(struct file *filp, struct address_space *mapping,
			struct list_head *pages, unsigned nr_pages);

382 383 384 385 386 387 388
	int (*write_begin)(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned flags,
				struct page **pagep, void **fsdata);
	int (*write_end)(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned copied,
				struct page *page, void *fsdata);

L
Linus Torvalds 已提交
389 390
	/* Unfortunately this kludge is needed for FIBMAP. Don't use it */
	sector_t (*bmap)(struct address_space *, sector_t);
391
	void (*invalidatepage) (struct page *, unsigned int, unsigned int);
A
Al Viro 已提交
392
	int (*releasepage) (struct page *, gfp_t);
393
	void (*freepage)(struct page *);
394
	ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter, loff_t offset);
395
	/*
396 397
	 * migrate the contents of a page to the specified target. If
	 * migrate_mode is MIGRATE_ASYNC, it must not block.
398
	 */
399
	int (*migratepage) (struct address_space *,
400
			struct page *, struct page *, enum migrate_mode);
401
	int (*launder_page) (struct page *);
402
	int (*is_partially_uptodate) (struct page *, unsigned long,
403
					unsigned long);
404
	void (*is_dirty_writeback) (struct page *, bool *, bool *);
405
	int (*error_remove_page)(struct address_space *, struct page *);
406 407

	/* swapfile support */
408 409 410
	int (*swap_activate)(struct swap_info_struct *sis, struct file *file,
				sector_t *span);
	void (*swap_deactivate)(struct file *file);
L
Linus Torvalds 已提交
411 412
};

J
Jens Axboe 已提交
413 414
extern const struct address_space_operations empty_aops;

415 416 417 418 419 420 421 422 423 424 425 426
/*
 * pagecache_write_begin/pagecache_write_end must be used by general code
 * to write into the pagecache.
 */
int pagecache_write_begin(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned flags,
				struct page **pagep, void **fsdata);

int pagecache_write_end(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned copied,
				struct page *page, void *fsdata);

L
Linus Torvalds 已提交
427 428 429
struct address_space {
	struct inode		*host;		/* owner: inode, block_device */
	struct radix_tree_root	page_tree;	/* radix tree of all pages */
N
Nick Piggin 已提交
430
	spinlock_t		tree_lock;	/* and lock protecting it */
431
	atomic_t		i_mmap_writable;/* count VM_SHARED mappings */
432
	struct rb_root		i_mmap;		/* tree of private and shared mappings */
433
	struct rw_semaphore	i_mmap_rwsem;	/* protect tree, count, list */
434
	/* Protected by tree_lock together with the radix tree */
L
Linus Torvalds 已提交
435
	unsigned long		nrpages;	/* number of total pages */
436 437
	/* number of shadow or DAX exceptional entries */
	unsigned long		nrexceptional;
L
Linus Torvalds 已提交
438
	pgoff_t			writeback_index;/* writeback starts here */
439
	const struct address_space_operations *a_ops;	/* methods */
L
Linus Torvalds 已提交
440 441 442
	unsigned long		flags;		/* error bits/gfp mask */
	spinlock_t		private_lock;	/* for use by the address_space */
	struct list_head	private_list;	/* ditto */
443
	void			*private_data;	/* ditto */
L
Linus Torvalds 已提交
444 445 446
} __attribute__((aligned(sizeof(long))));
	/*
	 * On most architectures that alignment is already the case; but
L
Lucas De Marchi 已提交
447
	 * must be enforced here for CRIS, to let the least significant bit
L
Linus Torvalds 已提交
448 449
	 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
	 */
450
struct request_queue;
L
Linus Torvalds 已提交
451 452 453

struct block_device {
	dev_t			bd_dev;  /* not a kdev_t - it's a search key */
454
	int			bd_openers;
L
Linus Torvalds 已提交
455
	struct inode *		bd_inode;	/* will die */
456
	struct super_block *	bd_super;
457
	struct mutex		bd_mutex;	/* open/close mutex */
L
Linus Torvalds 已提交
458
	struct list_head	bd_inodes;
459
	void *			bd_claiming;
L
Linus Torvalds 已提交
460 461
	void *			bd_holder;
	int			bd_holders;
462
	bool			bd_write_holder;
463
#ifdef CONFIG_SYSFS
464
	struct list_head	bd_holder_disks;
465
#endif
L
Linus Torvalds 已提交
466 467 468 469 470 471 472
	struct block_device *	bd_contains;
	unsigned		bd_block_size;
	struct hd_struct *	bd_part;
	/* number of times partitions within this device have been opened. */
	unsigned		bd_part_count;
	int			bd_invalidated;
	struct gendisk *	bd_disk;
473
	struct request_queue *  bd_queue;
L
Linus Torvalds 已提交
474 475 476 477 478 479 480 481
	struct list_head	bd_list;
	/*
	 * Private data.  You must have bd_claim'ed the block_device
	 * to use this.  NOTE:  bd_claim allows an owner to claim
	 * the same device multiple times, the owner must take special
	 * care to not mess up bd_private for that case.
	 */
	unsigned long		bd_private;
482 483 484 485 486

	/* The counter of freeze processes */
	int			bd_fsfreeze_count;
	/* Mutex for freeze */
	struct mutex		bd_fsfreeze_mutex;
L
Linus Torvalds 已提交
487 488 489 490 491 492 493 494
};

/*
 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
 * radix trees
 */
#define PAGECACHE_TAG_DIRTY	0
#define PAGECACHE_TAG_WRITEBACK	1
495
#define PAGECACHE_TAG_TOWRITE	2
L
Linus Torvalds 已提交
496 497 498

int mapping_tagged(struct address_space *mapping, int tag);

499 500
static inline void i_mmap_lock_write(struct address_space *mapping)
{
501
	down_write(&mapping->i_mmap_rwsem);
502 503 504 505
}

static inline void i_mmap_unlock_write(struct address_space *mapping)
{
506
	up_write(&mapping->i_mmap_rwsem);
507 508
}

D
Davidlohr Bueso 已提交
509 510 511 512 513 514 515 516 517 518
static inline void i_mmap_lock_read(struct address_space *mapping)
{
	down_read(&mapping->i_mmap_rwsem);
}

static inline void i_mmap_unlock_read(struct address_space *mapping)
{
	up_read(&mapping->i_mmap_rwsem);
}

L
Linus Torvalds 已提交
519 520 521 522 523
/*
 * Might pages of this file be mapped into userspace?
 */
static inline int mapping_mapped(struct address_space *mapping)
{
524
	return	!RB_EMPTY_ROOT(&mapping->i_mmap);
L
Linus Torvalds 已提交
525 526 527 528 529 530 531
}

/*
 * Might pages of this file have been modified in userspace?
 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
 * marks vma as VM_SHARED if it is shared, and the file was opened for
 * writing i.e. vma may be mprotected writable even if now readonly.
532 533 534
 *
 * If i_mmap_writable is negative, no new writable mappings are allowed. You
 * can only deny writable mappings, if none exists right now.
L
Linus Torvalds 已提交
535 536 537
 */
static inline int mapping_writably_mapped(struct address_space *mapping)
{
538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560
	return atomic_read(&mapping->i_mmap_writable) > 0;
}

static inline int mapping_map_writable(struct address_space *mapping)
{
	return atomic_inc_unless_negative(&mapping->i_mmap_writable) ?
		0 : -EPERM;
}

static inline void mapping_unmap_writable(struct address_space *mapping)
{
	atomic_dec(&mapping->i_mmap_writable);
}

static inline int mapping_deny_writable(struct address_space *mapping)
{
	return atomic_dec_unless_positive(&mapping->i_mmap_writable) ?
		0 : -EBUSY;
}

static inline void mapping_allow_writable(struct address_space *mapping)
{
	atomic_inc(&mapping->i_mmap_writable);
L
Linus Torvalds 已提交
561 562 563 564 565 566 567 568 569 570 571 572 573
}

/*
 * Use sequence counter to get consistent i_size on 32-bit processors.
 */
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
#include <linux/seqlock.h>
#define __NEED_I_SIZE_ORDERED
#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
#else
#define i_size_ordered_init(inode) do { } while (0)
#endif

A
Al Viro 已提交
574 575 576
struct posix_acl;
#define ACL_NOT_CACHED ((void *)(-1))

577 578 579 580 581 582 583 584 585
#define IOP_FASTPERM	0x0001
#define IOP_LOOKUP	0x0002
#define IOP_NOFOLLOW	0x0004

/*
 * Keep mostly read-only and often accessed (especially for
 * the RCU path lookup and 'stat' data) fields at the beginning
 * of the 'struct inode'
 */
L
Linus Torvalds 已提交
586
struct inode {
587
	umode_t			i_mode;
588
	unsigned short		i_opflags;
589 590
	kuid_t			i_uid;
	kgid_t			i_gid;
591 592 593 594 595 596 597
	unsigned int		i_flags;

#ifdef CONFIG_FS_POSIX_ACL
	struct posix_acl	*i_acl;
	struct posix_acl	*i_default_acl;
#endif

598 599
	const struct inode_operations	*i_op;
	struct super_block	*i_sb;
600
	struct address_space	*i_mapping;
601

602 603 604
#ifdef CONFIG_SECURITY
	void			*i_security;
#endif
605

606 607
	/* Stat data, not accessed from path walking */
	unsigned long		i_ino;
M
Miklos Szeredi 已提交
608 609 610 611 612 613 614 615 616 617 618
	/*
	 * Filesystems may only read i_nlink directly.  They shall use the
	 * following functions for modification:
	 *
	 *    (set|clear|inc|drop)_nlink
	 *    inode_(inc|dec)_link_count
	 */
	union {
		const unsigned int i_nlink;
		unsigned int __i_nlink;
	};
619
	dev_t			i_rdev;
620
	loff_t			i_size;
621 622 623
	struct timespec		i_atime;
	struct timespec		i_mtime;
	struct timespec		i_ctime;
624 625
	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
	unsigned short          i_bytes;
626
	unsigned int		i_blkbits;
627 628 629 630 631 632 633 634 635
	blkcnt_t		i_blocks;

#ifdef __NEED_I_SIZE_ORDERED
	seqcount_t		i_size_seqcount;
#endif

	/* Misc */
	unsigned long		i_state;
	struct mutex		i_mutex;
636

637
	unsigned long		dirtied_when;	/* jiffies of first dirtying */
638
	unsigned long		dirtied_time_when;
639

L
Linus Torvalds 已提交
640
	struct hlist_node	i_hash;
641
	struct list_head	i_io_list;	/* backing dev IO list */
642 643
#ifdef CONFIG_CGROUP_WRITEBACK
	struct bdi_writeback	*i_wb;		/* the associated cgroup wb */
644 645 646 647 648

	/* foreign inode detection, see wbc_detach_inode() */
	int			i_wb_frn_winner;
	u16			i_wb_frn_avg_time;
	u16			i_wb_frn_history;
649
#endif
N
Nick Piggin 已提交
650
	struct list_head	i_lru;		/* inode LRU list */
L
Linus Torvalds 已提交
651
	struct list_head	i_sb_list;
N
Nick Piggin 已提交
652
	union {
A
Al Viro 已提交
653
		struct hlist_head	i_dentry;
N
Nick Piggin 已提交
654 655
		struct rcu_head		i_rcu;
	};
656
	u64			i_version;
657
	atomic_t		i_count;
C
Christoph Hellwig 已提交
658
	atomic_t		i_dio_count;
659
	atomic_t		i_writecount;
M
Mimi Zohar 已提交
660 661 662
#ifdef CONFIG_IMA
	atomic_t		i_readcount; /* struct files open RO */
#endif
663
	const struct file_operations	*i_fop;	/* former ->i_op->default_file_ops */
664
	struct file_lock_context	*i_flctx;
L
Linus Torvalds 已提交
665 666
	struct address_space	i_data;
	struct list_head	i_devices;
667 668
	union {
		struct pipe_inode_info	*i_pipe;
669
		struct block_device	*i_bdev;
670
		struct cdev		*i_cdev;
A
Al Viro 已提交
671
		char			*i_link;
672
	};
L
Linus Torvalds 已提交
673 674 675

	__u32			i_generation;

676 677
#ifdef CONFIG_FSNOTIFY
	__u32			i_fsnotify_mask; /* all events this inode cares about */
678
	struct hlist_head	i_fsnotify_marks;
R
Robert Love 已提交
679 680
#endif

681
	void			*i_private; /* fs or device private pointer */
L
Linus Torvalds 已提交
682 683
};

A
Al Viro 已提交
684 685 686 687 688
static inline int inode_unhashed(struct inode *inode)
{
	return hlist_unhashed(&inode->i_hash);
}

I
Ingo Molnar 已提交
689 690 691 692 693 694
/*
 * inode->i_mutex nesting subclasses for the lock validator:
 *
 * 0: the object of the current VFS operation
 * 1: parent
 * 2: child/target
695 696
 * 3: xattr
 * 4: second non-directory
697 698 699
 * 5: second parent (when locking independent directories in rename)
 *
 * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two
700
 * non-directories at once.
I
Ingo Molnar 已提交
701 702
 *
 * The locking order between these classes is
703
 * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory
I
Ingo Molnar 已提交
704 705 706 707 708 709
 */
enum inode_i_mutex_lock_class
{
	I_MUTEX_NORMAL,
	I_MUTEX_PARENT,
	I_MUTEX_CHILD,
I
Ingo Molnar 已提交
710
	I_MUTEX_XATTR,
711 712
	I_MUTEX_NONDIR2,
	I_MUTEX_PARENT2,
I
Ingo Molnar 已提交
713 714
};

A
Al Viro 已提交
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
static inline void inode_lock(struct inode *inode)
{
	mutex_lock(&inode->i_mutex);
}

static inline void inode_unlock(struct inode *inode)
{
	mutex_unlock(&inode->i_mutex);
}

static inline int inode_trylock(struct inode *inode)
{
	return mutex_trylock(&inode->i_mutex);
}

static inline int inode_is_locked(struct inode *inode)
{
	return mutex_is_locked(&inode->i_mutex);
}

static inline void inode_lock_nested(struct inode *inode, unsigned subclass)
{
	mutex_lock_nested(&inode->i_mutex, subclass);
}

740 741 742
void lock_two_nondirectories(struct inode *, struct inode*);
void unlock_two_nondirectories(struct inode *, struct inode*);

L
Linus Torvalds 已提交
743 744 745 746 747 748 749 750 751 752
/*
 * NOTE: in a 32bit arch with a preemptable kernel and
 * an UP compile the i_size_read/write must be atomic
 * with respect to the local cpu (unlike with preempt disabled),
 * but they don't need to be atomic with respect to other cpus like in
 * true SMP (so they need either to either locally disable irq around
 * the read or for example on x86 they can be still implemented as a
 * cmpxchg8b without the need of the lock prefix). For SMP compiles
 * and 64bit archs it makes no difference if preempt is enabled or not.
 */
J
Jan Engelhardt 已提交
753
static inline loff_t i_size_read(const struct inode *inode)
L
Linus Torvalds 已提交
754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	loff_t i_size;
	unsigned int seq;

	do {
		seq = read_seqcount_begin(&inode->i_size_seqcount);
		i_size = inode->i_size;
	} while (read_seqcount_retry(&inode->i_size_seqcount, seq));
	return i_size;
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
	loff_t i_size;

	preempt_disable();
	i_size = inode->i_size;
	preempt_enable();
	return i_size;
#else
	return inode->i_size;
#endif
}

776 777 778 779 780
/*
 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
 */
L
Linus Torvalds 已提交
781 782 783
static inline void i_size_write(struct inode *inode, loff_t i_size)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
784
	preempt_disable();
L
Linus Torvalds 已提交
785 786 787
	write_seqcount_begin(&inode->i_size_seqcount);
	inode->i_size = i_size;
	write_seqcount_end(&inode->i_size_seqcount);
788
	preempt_enable();
L
Linus Torvalds 已提交
789 790 791 792 793 794 795 796 797
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
	preempt_disable();
	inode->i_size = i_size;
	preempt_enable();
#else
	inode->i_size = i_size;
#endif
}

798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822
/* Helper functions so that in most cases filesystems will
 * not need to deal directly with kuid_t and kgid_t and can
 * instead deal with the raw numeric values that are stored
 * in the filesystem.
 */
static inline uid_t i_uid_read(const struct inode *inode)
{
	return from_kuid(&init_user_ns, inode->i_uid);
}

static inline gid_t i_gid_read(const struct inode *inode)
{
	return from_kgid(&init_user_ns, inode->i_gid);
}

static inline void i_uid_write(struct inode *inode, uid_t uid)
{
	inode->i_uid = make_kuid(&init_user_ns, uid);
}

static inline void i_gid_write(struct inode *inode, gid_t gid)
{
	inode->i_gid = make_kgid(&init_user_ns, gid);
}

J
Jan Engelhardt 已提交
823
static inline unsigned iminor(const struct inode *inode)
L
Linus Torvalds 已提交
824 825 826 827
{
	return MINOR(inode->i_rdev);
}

J
Jan Engelhardt 已提交
828
static inline unsigned imajor(const struct inode *inode)
L
Linus Torvalds 已提交
829 830 831 832 833 834 835 836
{
	return MAJOR(inode->i_rdev);
}

extern struct block_device *I_BDEV(struct inode *inode);

struct fown_struct {
	rwlock_t lock;          /* protects pid, uid, euid fields */
837 838
	struct pid *pid;	/* pid or -pgrp where SIGIO should be sent */
	enum pid_type pid_type;	/* Kind of process group SIGIO should be sent to */
839
	kuid_t uid, euid;	/* uid/euid of process setting the owner */
L
Linus Torvalds 已提交
840 841 842 843 844 845 846
	int signum;		/* posix.1b rt signal to be delivered on IO */
};

/*
 * Track a single file's readahead state
 */
struct file_ra_state {
F
Fengguang Wu 已提交
847 848 849
	pgoff_t start;			/* where readahead started */
	unsigned int size;		/* # of readahead pages */
	unsigned int async_size;	/* do asynchronous readahead when
850
					   there are only # of pages ahead */
851

F
Fengguang Wu 已提交
852
	unsigned int ra_pages;		/* Maximum readahead window */
853
	unsigned int mmap_miss;		/* Cache miss stat for mmap accesses */
854
	loff_t prev_pos;		/* Cache last read() position */
L
Linus Torvalds 已提交
855 856
};

857 858 859 860 861
/*
 * Check if @index falls in the readahead windows.
 */
static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
{
862 863
	return (index >= ra->start &&
		index <  ra->start + ra->size);
864 865
}

L
Linus Torvalds 已提交
866
struct file {
E
Eric Dumazet 已提交
867
	union {
868
		struct llist_node	fu_llist;
E
Eric Dumazet 已提交
869 870
		struct rcu_head 	fu_rcuhead;
	} f_u;
871
	struct path		f_path;
872
	struct inode		*f_inode;	/* cached value */
873
	const struct file_operations	*f_op;
874 875

	/*
876
	 * Protects f_ep_links, f_flags.
877 878 879
	 * Must not be taken from IRQ context.
	 */
	spinlock_t		f_lock;
A
Al Viro 已提交
880
	atomic_long_t		f_count;
L
Linus Torvalds 已提交
881
	unsigned int 		f_flags;
882
	fmode_t			f_mode;
883
	struct mutex		f_pos_lock;
L
Linus Torvalds 已提交
884 885
	loff_t			f_pos;
	struct fown_struct	f_owner;
D
David Howells 已提交
886
	const struct cred	*f_cred;
L
Linus Torvalds 已提交
887 888
	struct file_ra_state	f_ra;

889
	u64			f_version;
890
#ifdef CONFIG_SECURITY
L
Linus Torvalds 已提交
891
	void			*f_security;
892
#endif
L
Linus Torvalds 已提交
893 894 895 896 897 898
	/* needed for tty driver, and maybe others */
	void			*private_data;

#ifdef CONFIG_EPOLL
	/* Used by fs/eventpoll.c to link all the hooks to this file */
	struct list_head	f_ep_links;
J
Jason Baron 已提交
899
	struct list_head	f_tfile_llink;
L
Linus Torvalds 已提交
900 901
#endif /* #ifdef CONFIG_EPOLL */
	struct address_space	*f_mapping;
A
Al Viro 已提交
902
} __attribute__((aligned(4)));	/* lest something weird decides that 2 is OK */
L
Linus Torvalds 已提交
903

904 905 906 907 908 909 910
struct file_handle {
	__u32 handle_bytes;
	int handle_type;
	/* file identifier */
	unsigned char f_handle[0];
};

A
Al Viro 已提交
911 912 913 914 915
static inline struct file *get_file(struct file *f)
{
	atomic_long_inc(&f->f_count);
	return f;
}
916
#define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count)
917
#define fput_atomic(x)	atomic_long_add_unless(&(x)->f_count, -1, 1)
A
Al Viro 已提交
918
#define file_count(x)	atomic_long_read(&(x)->f_count)
L
Linus Torvalds 已提交
919 920 921 922 923 924

#define	MAX_NON_LFS	((1UL<<31) - 1)

/* Page cache limit. The filesystems should put that into their s_maxbytes 
   limits, otherwise bad things can happen in VM. */ 
#if BITS_PER_LONG==32
C
Chuck Lever 已提交
925
#define MAX_LFS_FILESIZE	(((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 
L
Linus Torvalds 已提交
926
#elif BITS_PER_LONG==64
927
#define MAX_LFS_FILESIZE 	((loff_t)0x7fffffffffffffffLL)
L
Linus Torvalds 已提交
928 929 930 931
#endif

#define FL_POSIX	1
#define FL_FLOCK	2
932
#define FL_DELEG	4	/* NFSv4 delegation */
L
Linus Torvalds 已提交
933
#define FL_ACCESS	8	/* not trying to lock, just looking */
934
#define FL_EXISTS	16	/* when unlocking, test for existence */
L
Linus Torvalds 已提交
935
#define FL_LEASE	32	/* lease held on this file */
936
#define FL_CLOSE	64	/* unlock on close */
L
Linus Torvalds 已提交
937
#define FL_SLEEP	128	/* A blocking lock */
938 939
#define FL_DOWNGRADE_PENDING	256 /* Lease is being downgraded */
#define FL_UNLOCK_PENDING	512 /* Lease is being broken */
940
#define FL_OFDLCK	1024	/* lock is "owned" by struct file */
C
Christoph Hellwig 已提交
941
#define FL_LAYOUT	2048	/* outstanding pNFS layout */
L
Linus Torvalds 已提交
942

943 944 945 946 947 948
/*
 * Special return value from posix_lock_file() and vfs_lock_file() for
 * asynchronous locking.
 */
#define FILE_LOCK_DEFERRED 1

949
/* legacy typedef, should eventually be removed */
950
typedef void *fl_owner_t;
L
Linus Torvalds 已提交
951

952 953
struct file_lock;

L
Linus Torvalds 已提交
954 955 956 957 958 959
struct file_lock_operations {
	void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
	void (*fl_release_private)(struct file_lock *);
};

struct lock_manager_operations {
J
J. Bruce Fields 已提交
960
	int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
961
	unsigned long (*lm_owner_key)(struct file_lock *);
962 963
	fl_owner_t (*lm_get_owner)(fl_owner_t);
	void (*lm_put_owner)(fl_owner_t);
J
J. Bruce Fields 已提交
964
	void (*lm_notify)(struct file_lock *);	/* unblock callback */
965
	int (*lm_grant)(struct file_lock *, int);
J
Jeff Layton 已提交
966
	bool (*lm_break)(struct file_lock *);
967
	int (*lm_change)(struct file_lock *, int, struct list_head *);
968
	void (*lm_setup)(struct file_lock *, void **);
L
Linus Torvalds 已提交
969 970
};

971 972
struct lock_manager {
	struct list_head list;
973 974 975 976 977
	/*
	 * NFSv4 and up also want opens blocked during the grace period;
	 * NLM doesn't care:
	 */
	bool block_opens;
978 979
};

980 981
struct net;
void locks_start_grace(struct net *, struct lock_manager *);
982
void locks_end_grace(struct lock_manager *);
983
int locks_in_grace(struct net *);
984
int opens_in_grace(struct net *);
985

L
Linus Torvalds 已提交
986 987 988
/* that will die - we need it for nfs_lock_info */
#include <linux/nfs_fs_i.h>

989 990 991 992 993 994 995 996 997
/*
 * struct file_lock represents a generic "file lock". It's used to represent
 * POSIX byte range locks, BSD (flock) locks, and leases. It's important to
 * note that the same struct is used to represent both a request for a lock and
 * the lock itself, but the same object is never used for both.
 *
 * FIXME: should we create a separate "struct lock_request" to help distinguish
 * these two uses?
 *
998
 * The varous i_flctx lists are ordered by:
999
 *
1000 1001 1002
 * 1) lock owner
 * 2) lock range start
 * 3) lock range end
1003 1004 1005
 *
 * Obviously, the last two criteria only matter for POSIX locks.
 */
L
Linus Torvalds 已提交
1006 1007
struct file_lock {
	struct file_lock *fl_next;	/* singly linked list for this inode  */
1008
	struct list_head fl_list;	/* link into file_lock_context */
1009
	struct hlist_node fl_link;	/* node in global lists */
L
Linus Torvalds 已提交
1010 1011
	struct list_head fl_block;	/* circular list of blocked processes */
	fl_owner_t fl_owner;
1012
	unsigned int fl_flags;
1013
	unsigned char fl_type;
L
Linus Torvalds 已提交
1014
	unsigned int fl_pid;
1015
	int fl_link_cpu;		/* what cpu's list is this on? */
1016
	struct pid *fl_nspid;
L
Linus Torvalds 已提交
1017 1018 1019 1020 1021 1022
	wait_queue_head_t fl_wait;
	struct file *fl_file;
	loff_t fl_start;
	loff_t fl_end;

	struct fasync_struct *	fl_fasync; /* for lease break notifications */
1023 1024 1025
	/* for lease breaks: */
	unsigned long fl_break_time;
	unsigned long fl_downgrade_time;
L
Linus Torvalds 已提交
1026

1027
	const struct file_lock_operations *fl_ops;	/* Callbacks for filesystems */
1028
	const struct lock_manager_operations *fl_lmops;	/* Callbacks for lockmanagers */
L
Linus Torvalds 已提交
1029 1030
	union {
		struct nfs_lock_info	nfs_fl;
1031
		struct nfs4_lock_info	nfs4_fl;
D
David Howells 已提交
1032 1033 1034 1035
		struct {
			struct list_head link;	/* link in AFS vnode's pending_locks list */
			int state;		/* state of grant or error if -ve */
		} afs;
L
Linus Torvalds 已提交
1036 1037 1038
	} fl_u;
};

1039
struct file_lock_context {
1040
	spinlock_t		flc_lock;
1041
	struct list_head	flc_flock;
1042
	struct list_head	flc_posix;
1043
	struct list_head	flc_lease;
1044 1045
};

L
Linus Torvalds 已提交
1046 1047 1048 1049 1050 1051 1052 1053 1054
/* The following constant reflects the upper bound of the file/locking space */
#ifndef OFFSET_MAX
#define INT_LIMIT(x)	(~((x)1 << (sizeof(x)*8 - 1)))
#define OFFSET_MAX	INT_LIMIT(loff_t)
#define OFFT_OFFSET_MAX	INT_LIMIT(off_t)
#endif

#include <linux/fcntl.h>

1055 1056 1057
extern void send_sigio(struct fown_struct *fown, int fd, int band);

#ifdef CONFIG_FILE_LOCKING
1058
extern int fcntl_getlk(struct file *, unsigned int, struct flock __user *);
1059 1060
extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
			struct flock __user *);
L
Linus Torvalds 已提交
1061 1062

#if BITS_PER_LONG == 32
1063
extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 __user *);
1064 1065
extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
			struct flock64 __user *);
L
Linus Torvalds 已提交
1066 1067 1068 1069 1070 1071
#endif

extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
extern int fcntl_getlease(struct file *filp);

/* fs/locks.c */
1072
void locks_free_lock_context(struct inode *inode);
1073
void locks_free_lock(struct file_lock *fl);
L
Linus Torvalds 已提交
1074
extern void locks_init_lock(struct file_lock *);
1075
extern struct file_lock * locks_alloc_lock(void);
L
Linus Torvalds 已提交
1076
extern void locks_copy_lock(struct file_lock *, struct file_lock *);
1077
extern void locks_copy_conflock(struct file_lock *, struct file_lock *);
L
Linus Torvalds 已提交
1078
extern void locks_remove_posix(struct file *, fl_owner_t);
1079
extern void locks_remove_file(struct file *);
1080
extern void locks_release_private(struct file_lock *);
1081
extern void posix_test_lock(struct file *, struct file_lock *);
1082
extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
1083
extern int posix_unblock_lock(struct file_lock *);
1084
extern int vfs_test_lock(struct file *, struct file_lock *);
1085
extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
M
Marc Eshel 已提交
1086
extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
1087
extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl);
J
J. Bruce Fields 已提交
1088
extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type);
L
Linus Torvalds 已提交
1089
extern void lease_get_mtime(struct inode *, struct timespec *time);
1090 1091
extern int generic_setlease(struct file *, long, struct file_lock **, void **priv);
extern int vfs_setlease(struct file *, long, struct file_lock **, void **);
1092
extern int lease_modify(struct file_lock *, int, struct list_head *);
1093 1094 1095
struct files_struct;
extern void show_fd_locks(struct seq_file *f,
			 struct file *filp, struct files_struct *files);
1096
#else /* !CONFIG_FILE_LOCKING */
1097 1098
static inline int fcntl_getlk(struct file *file, unsigned int cmd,
			      struct flock __user *user)
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
{
	return -EINVAL;
}

static inline int fcntl_setlk(unsigned int fd, struct file *file,
			      unsigned int cmd, struct flock __user *user)
{
	return -EACCES;
}

1109
#if BITS_PER_LONG == 32
1110 1111
static inline int fcntl_getlk64(struct file *file, unsigned int cmd,
				struct flock64 __user *user)
1112 1113 1114 1115 1116 1117 1118 1119 1120
{
	return -EINVAL;
}

static inline int fcntl_setlk64(unsigned int fd, struct file *file,
				unsigned int cmd, struct flock64 __user *user)
{
	return -EACCES;
}
1121
#endif
1122 1123
static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
{
1124
	return -EINVAL;
1125 1126 1127 1128
}

static inline int fcntl_getlease(struct file *filp)
{
1129
	return F_UNLCK;
1130 1131
}

1132
static inline void
1133
locks_free_lock_context(struct inode *inode)
1134 1135 1136
{
}

1137 1138 1139 1140 1141
static inline void locks_init_lock(struct file_lock *fl)
{
	return;
}

1142
static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl)
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
{
	return;
}

static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
{
	return;
}

static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
{
	return;
}

1157
static inline void locks_remove_file(struct file *filp)
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
{
	return;
}

static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
{
	return;
}

static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
				  struct file_lock *conflock)
{
	return -ENOLCK;
}

1173
static inline int posix_unblock_lock(struct file_lock *waiter)
1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
{
	return -ENOENT;
}

static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
{
	return 0;
}

static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
				struct file_lock *fl, struct file_lock *conf)
{
	return -ENOLCK;
}

static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
{
	return 0;
}

1194 1195 1196 1197 1198
static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl)
{
	return -ENOLCK;
}

J
J. Bruce Fields 已提交
1199
static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
{
	return 0;
}

static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
{
	return;
}

static inline int generic_setlease(struct file *filp, long arg,
1210
				    struct file_lock **flp, void **priv)
1211 1212 1213 1214 1215
{
	return -EINVAL;
}

static inline int vfs_setlease(struct file *filp, long arg,
1216
			       struct file_lock **lease, void **priv)
1217 1218 1219 1220
{
	return -EINVAL;
}

1221
static inline int lease_modify(struct file_lock *fl, int arg,
1222
			       struct list_head *dispose)
1223 1224 1225
{
	return -EINVAL;
}
1226 1227 1228 1229

struct files_struct;
static inline void show_fd_locks(struct seq_file *f,
			struct file *filp, struct files_struct *files) {}
1230 1231
#endif /* !CONFIG_FILE_LOCKING */

1232 1233 1234 1235 1236
static inline struct inode *file_inode(const struct file *f)
{
	return f->f_inode;
}

1237 1238 1239 1240 1241
static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
{
	return locks_lock_inode_wait(file_inode(filp), fl);
}

L
Linus Torvalds 已提交
1242
struct fasync_struct {
1243 1244 1245 1246 1247 1248
	spinlock_t		fa_lock;
	int			magic;
	int			fa_fd;
	struct fasync_struct	*fa_next; /* singly linked list */
	struct file		*fa_file;
	struct rcu_head		fa_rcu;
L
Linus Torvalds 已提交
1249 1250 1251 1252 1253 1254
};

#define FASYNC_MAGIC 0x4601

/* SMP safe fasync helpers: */
extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1255 1256 1257 1258 1259
extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *);
extern int fasync_remove_entry(struct file *, struct fasync_struct **);
extern struct fasync_struct *fasync_alloc(void);
extern void fasync_free(struct fasync_struct *);

L
Linus Torvalds 已提交
1260 1261 1262
/* can be called from interrupts */
extern void kill_fasync(struct fasync_struct **, int, int);

1263 1264
extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
extern void f_setown(struct file *filp, unsigned long arg, int force);
L
Linus Torvalds 已提交
1265
extern void f_delown(struct file *filp);
1266
extern pid_t f_getown(struct file *filp);
L
Linus Torvalds 已提交
1267 1268
extern int send_sigurg(struct fown_struct *fown);

1269 1270
struct mm_struct;

L
Linus Torvalds 已提交
1271 1272 1273 1274 1275 1276 1277
/*
 *	Umount options
 */

#define MNT_FORCE	0x00000001	/* Attempt to forcibily umount */
#define MNT_DETACH	0x00000002	/* Just detach from the tree */
#define MNT_EXPIRE	0x00000004	/* Mark for expiry */
1278 1279
#define UMOUNT_NOFOLLOW	0x00000008	/* Don't follow symlink on umount */
#define UMOUNT_UNUSED	0x80000000	/* Flag guaranteed to be unused */
L
Linus Torvalds 已提交
1280

1281 1282
/* sb->s_iflags */
#define SB_I_CGROUPWB	0x00000001	/* cgroup-aware writeback enabled */
1283
#define SB_I_NOEXEC	0x00000002	/* Ignore executables on this fs */
L
Linus Torvalds 已提交
1284

1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
/* Possible states of 'frozen' field */
enum {
	SB_UNFROZEN = 0,		/* FS is unfrozen */
	SB_FREEZE_WRITE	= 1,		/* Writes, dir ops, ioctls frozen */
	SB_FREEZE_PAGEFAULT = 2,	/* Page faults stopped as well */
	SB_FREEZE_FS = 3,		/* For internal FS use (e.g. to stop
					 * internal threads if needed) */
	SB_FREEZE_COMPLETE = 4,		/* ->freeze_fs finished successfully */
};

#define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)

struct sb_writers {
1298 1299 1300
	int				frozen;		/* Is sb frozen? */
	wait_queue_head_t		wait_unfrozen;	/* for get_super_thawed() */
	struct percpu_rw_semaphore	rw_sem[SB_FREEZE_LEVELS];
1301 1302
};

L
Linus Torvalds 已提交
1303 1304 1305
struct super_block {
	struct list_head	s_list;		/* Keep this first */
	dev_t			s_dev;		/* search index; _not_ kdev_t */
1306 1307
	unsigned char		s_blocksize_bits;
	unsigned long		s_blocksize;
1308
	loff_t			s_maxbytes;	/* Max file size */
L
Linus Torvalds 已提交
1309
	struct file_system_type	*s_type;
1310
	const struct super_operations	*s_op;
1311
	const struct dquot_operations	*dq_op;
1312
	const struct quotactl_ops	*s_qcop;
1313
	const struct export_operations *s_export_op;
L
Linus Torvalds 已提交
1314
	unsigned long		s_flags;
1315
	unsigned long		s_iflags;	/* internal SB_I_* flags */
L
Linus Torvalds 已提交
1316 1317 1318 1319 1320
	unsigned long		s_magic;
	struct dentry		*s_root;
	struct rw_semaphore	s_umount;
	int			s_count;
	atomic_t		s_active;
1321
#ifdef CONFIG_SECURITY
L
Linus Torvalds 已提交
1322
	void                    *s_security;
1323
#endif
1324
	const struct xattr_handler **s_xattr;
L
Linus Torvalds 已提交
1325

1326
	struct hlist_bl_head	s_anon;		/* anonymous dentries for (nfs) exporting */
1327
	struct list_head	s_mounts;	/* list of mounts; _not_ for fs use */
L
Linus Torvalds 已提交
1328
	struct block_device	*s_bdev;
J
Jens Axboe 已提交
1329
	struct backing_dev_info *s_bdi;
1330
	struct mtd_info		*s_mtd;
A
Al Viro 已提交
1331
	struct hlist_node	s_instances;
1332
	unsigned int		s_quota_types;	/* Bitmask of supported quota types */
L
Linus Torvalds 已提交
1333 1334
	struct quota_info	s_dquot;	/* Diskquota specific options */

1335
	struct sb_writers	s_writers;
L
Linus Torvalds 已提交
1336 1337

	char s_id[32];				/* Informational name */
1338
	u8 s_uuid[16];				/* UUID */
L
Linus Torvalds 已提交
1339 1340

	void 			*s_fs_info;	/* Filesystem private info */
1341
	unsigned int		s_max_links;
1342
	fmode_t			s_mode;
L
Linus Torvalds 已提交
1343

1344 1345 1346 1347
	/* Granularity of c/m/atime in ns.
	   Cannot be worse than a second */
	u32		   s_time_gran;

L
Linus Torvalds 已提交
1348 1349 1350 1351
	/*
	 * The next field is for VFS *only*. No filesystems have any business
	 * even looking at it. You had been warned.
	 */
1352
	struct mutex s_vfs_rename_mutex;	/* Kludge */
L
Linus Torvalds 已提交
1353

M
Miklos Szeredi 已提交
1354 1355 1356 1357 1358
	/*
	 * Filesystem subtype.  If non-empty the filesystem type field
	 * in /proc/mounts will be "type.subtype"
	 */
	char *s_subtype;
1359 1360 1361 1362 1363

	/*
	 * Saved mount options for lazy filesystems using
	 * generic_show_options()
	 */
A
Arnd Bergmann 已提交
1364
	char __rcu *s_options;
A
Al Viro 已提交
1365
	const struct dentry_operations *s_d_op; /* default d_op for dentries */
1366 1367 1368 1369 1370

	/*
	 * Saved pool identifier for cleancache (-1 means none)
	 */
	int cleancache_poolid;
1371 1372

	struct shrinker s_shrink;	/* per-sb shrinker handle */
1373

M
Miklos Szeredi 已提交
1374 1375 1376
	/* Number of inodes with nlink == 0 but still referenced */
	atomic_long_t s_remove_count;

1377 1378
	/* Being remounted read-only */
	int s_readonly_remount;
1379 1380 1381

	/* AIO completions deferred from interrupt context */
	struct workqueue_struct *s_dio_done_wq;
A
Al Viro 已提交
1382
	struct hlist_head s_pins;
1383 1384 1385 1386 1387 1388 1389

	/*
	 * Keep the lru lists last in the structure so they always sit on their
	 * own individual cachelines.
	 */
	struct list_lru		s_dentry_lru ____cacheline_aligned_in_smp;
	struct list_lru		s_inode_lru ____cacheline_aligned_in_smp;
A
Al Viro 已提交
1390
	struct rcu_head		rcu;
1391
	struct work_struct	destroy_work;
1392

1393
	struct mutex		s_sync_lock;	/* sync serialisation lock */
1394 1395 1396 1397 1398

	/*
	 * Indicates how deep in a filesystem stack this SB is
	 */
	int s_stack_depth;
1399 1400 1401 1402

	/* s_inode_list_lock protects s_inodes */
	spinlock_t		s_inode_list_lock ____cacheline_aligned_in_smp;
	struct list_head	s_inodes;	/* all inodes */
L
Linus Torvalds 已提交
1403 1404 1405 1406 1407 1408 1409 1410
};

extern struct timespec current_fs_time(struct super_block *sb);

/*
 * Snapshotting support.
 */

1411 1412 1413
void __sb_end_write(struct super_block *sb, int level);
int __sb_start_write(struct super_block *sb, int level, bool wait);

1414
#define __sb_writers_acquired(sb, lev)	\
1415
	percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
1416
#define __sb_writers_release(sb, lev)	\
1417
	percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
1418

1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
/**
 * sb_end_write - drop write access to a superblock
 * @sb: the super we wrote to
 *
 * Decrement number of writers to the filesystem. Wake up possible waiters
 * wanting to freeze the filesystem.
 */
static inline void sb_end_write(struct super_block *sb)
{
	__sb_end_write(sb, SB_FREEZE_WRITE);
}

/**
 * sb_end_pagefault - drop write access to a superblock from a page fault
 * @sb: the super we wrote to
 *
 * Decrement number of processes handling write page fault to the filesystem.
 * Wake up possible waiters wanting to freeze the filesystem.
 */
static inline void sb_end_pagefault(struct super_block *sb)
{
	__sb_end_write(sb, SB_FREEZE_PAGEFAULT);
}

/**
 * sb_end_intwrite - drop write access to a superblock for internal fs purposes
 * @sb: the super we wrote to
 *
 * Decrement fs-internal number of writers to the filesystem.  Wake up possible
 * waiters wanting to freeze the filesystem.
 */
static inline void sb_end_intwrite(struct super_block *sb)
{
	__sb_end_write(sb, SB_FREEZE_FS);
}

/**
 * sb_start_write - get write access to a superblock
 * @sb: the super we write to
 *
 * When a process wants to write data or metadata to a file system (i.e. dirty
 * a page or an inode), it should embed the operation in a sb_start_write() -
 * sb_end_write() pair to get exclusion against file system freezing. This
 * function increments number of writers preventing freezing. If the file
 * system is already frozen, the function waits until the file system is
 * thawed.
 *
 * Since freeze protection behaves as a lock, users have to preserve
 * ordering of freeze protection and other filesystem locks. Generally,
 * freeze protection should be the outermost lock. In particular, we have:
 *
 * sb_start_write
 *   -> i_mutex			(write path, truncate, directory ops, ...)
 *   -> s_umount		(freeze_super, thaw_super)
 */
static inline void sb_start_write(struct super_block *sb)
{
	__sb_start_write(sb, SB_FREEZE_WRITE, true);
}

static inline int sb_start_write_trylock(struct super_block *sb)
{
	return __sb_start_write(sb, SB_FREEZE_WRITE, false);
}

/**
 * sb_start_pagefault - get write access to a superblock from a page fault
 * @sb: the super we write to
 *
 * When a process starts handling write page fault, it should embed the
 * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
 * exclusion against file system freezing. This is needed since the page fault
 * is going to dirty a page. This function increments number of running page
 * faults preventing freezing. If the file system is already frozen, the
 * function waits until the file system is thawed.
 *
 * Since page fault freeze protection behaves as a lock, users have to preserve
 * ordering of freeze protection and other filesystem locks. It is advised to
 * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault
 * handling code implies lock dependency:
 *
 * mmap_sem
 *   -> sb_start_pagefault
 */
static inline void sb_start_pagefault(struct super_block *sb)
{
	__sb_start_write(sb, SB_FREEZE_PAGEFAULT, true);
}

/*
 * sb_start_intwrite - get write access to a superblock for internal fs purposes
 * @sb: the super we write to
 *
 * This is the third level of protection against filesystem freezing. It is
 * free for use by a filesystem. The only requirement is that it must rank
 * below sb_start_pagefault.
 *
 * For example filesystem can call sb_start_intwrite() when starting a
 * transaction which somewhat eases handling of freezing for internal sources
 * of filesystem changes (internal fs threads, discarding preallocation on file
 * close, etc.).
 */
static inline void sb_start_intwrite(struct super_block *sb)
{
	__sb_start_write(sb, SB_FREEZE_FS, true);
}
L
Linus Torvalds 已提交
1525 1526


1527
extern bool inode_owner_or_capable(const struct inode *inode);
1528

L
Linus Torvalds 已提交
1529 1530 1531
/*
 * VFS helper functions..
 */
A
Al Viro 已提交
1532
extern int vfs_create(struct inode *, struct dentry *, umode_t, bool);
1533
extern int vfs_mkdir(struct inode *, struct dentry *, umode_t);
A
Al Viro 已提交
1534
extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
1535
extern int vfs_symlink(struct inode *, struct dentry *, const char *);
J
J. Bruce Fields 已提交
1536
extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **);
L
Linus Torvalds 已提交
1537
extern int vfs_rmdir(struct inode *, struct dentry *);
1538
extern int vfs_unlink(struct inode *, struct dentry *, struct inode **);
M
Miklos Szeredi 已提交
1539
extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int);
M
Miklos Szeredi 已提交
1540
extern int vfs_whiteout(struct inode *, struct dentry *);
L
Linus Torvalds 已提交
1541 1542 1543 1544 1545 1546

/*
 * VFS dentry helper functions.
 */
extern void dentry_unhash(struct dentry *dentry);

1547 1548 1549
/*
 * VFS file helper functions.
 */
1550
extern void inode_init_owner(struct inode *inode, const struct inode *dir,
A
Al Viro 已提交
1551
			umode_t mode);
M
Mark Fasheh 已提交
1552 1553 1554 1555 1556 1557 1558
/*
 * VFS FS_IOC_FIEMAP helper definitions.
 */
struct fiemap_extent_info {
	unsigned int fi_flags;		/* Flags as passed from user */
	unsigned int fi_extents_mapped;	/* Number of mapped extents */
	unsigned int fi_extents_max;	/* Size of fiemap_extent array */
1559 1560
	struct fiemap_extent __user *fi_extents_start; /* Start of
							fiemap_extent array */
M
Mark Fasheh 已提交
1561 1562 1563 1564 1565
};
int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
			    u64 phys, u64 len, u32 flags);
int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);

L
Linus Torvalds 已提交
1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587
/*
 * File types
 *
 * NOTE! These match bits 12..15 of stat.st_mode
 * (ie "(i_mode >> 12) & 15").
 */
#define DT_UNKNOWN	0
#define DT_FIFO		1
#define DT_CHR		2
#define DT_DIR		4
#define DT_BLK		6
#define DT_REG		8
#define DT_LNK		10
#define DT_SOCK		12
#define DT_WHT		14

/*
 * This is the "filldir" function type, used by readdir() to let
 * the kernel specify what kind of dirent layout it wants to have.
 * This allows the kernel to read directories into kernel space or
 * to have different dirent layouts depending on the binary type.
 */
1588 1589 1590 1591
struct dir_context;
typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64,
			 unsigned);

1592
struct dir_context {
A
Al Viro 已提交
1593
	const filldir_t actor;
1594
	loff_t pos;
1595
};
1596

1597
struct block_device_operations;
L
Linus Torvalds 已提交
1598 1599 1600 1601 1602 1603 1604

/* These macros are for out of kernel modules to test that
 * the kernel supports the unlocked_ioctl and compat_ioctl
 * fields in struct file_operations. */
#define HAVE_COMPAT_IOCTL 1
#define HAVE_UNLOCKED_IOCTL 1

1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624
/*
 * These flags let !MMU mmap() govern direct device mapping vs immediate
 * copying more easily for MAP_PRIVATE, especially for ROM filesystems.
 *
 * NOMMU_MAP_COPY:	Copy can be mapped (MAP_PRIVATE)
 * NOMMU_MAP_DIRECT:	Can be mapped directly (MAP_SHARED)
 * NOMMU_MAP_READ:	Can be mapped for reading
 * NOMMU_MAP_WRITE:	Can be mapped for writing
 * NOMMU_MAP_EXEC:	Can be mapped for execution
 */
#define NOMMU_MAP_COPY		0x00000001
#define NOMMU_MAP_DIRECT	0x00000008
#define NOMMU_MAP_READ		VM_MAYREAD
#define NOMMU_MAP_WRITE		VM_MAYWRITE
#define NOMMU_MAP_EXEC		VM_MAYEXEC

#define NOMMU_VMFLAGS \
	(NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC)


1625 1626
struct iov_iter;

L
Linus Torvalds 已提交
1627 1628 1629 1630 1631
struct file_operations {
	struct module *owner;
	loff_t (*llseek) (struct file *, loff_t, int);
	ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
	ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1632 1633
	ssize_t (*read_iter) (struct kiocb *, struct iov_iter *);
	ssize_t (*write_iter) (struct kiocb *, struct iov_iter *);
1634
	int (*iterate) (struct file *, struct dir_context *);
L
Linus Torvalds 已提交
1635 1636 1637 1638 1639
	unsigned int (*poll) (struct file *, struct poll_table_struct *);
	long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
	long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
	int (*mmap) (struct file *, struct vm_area_struct *);
	int (*open) (struct inode *, struct file *);
1640
	int (*flush) (struct file *, fl_owner_t id);
L
Linus Torvalds 已提交
1641
	int (*release) (struct inode *, struct file *);
1642
	int (*fsync) (struct file *, loff_t, loff_t, int datasync);
L
Linus Torvalds 已提交
1643 1644 1645 1646 1647 1648 1649
	int (*aio_fsync) (struct kiocb *, int datasync);
	int (*fasync) (int, struct file *, int);
	int (*lock) (struct file *, int, struct file_lock *);
	ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
	int (*check_flags)(int);
	int (*flock) (struct file *, int, struct file_lock *);
1650 1651
	ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
	ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1652
	int (*setlease)(struct file *, long, struct file_lock **, void **);
1653 1654
	long (*fallocate)(struct file *file, int mode, loff_t offset,
			  loff_t len);
1655
	void (*show_fdinfo)(struct seq_file *m, struct file *f);
1656 1657 1658
#ifndef CONFIG_MMU
	unsigned (*mmap_capabilities)(struct file *);
#endif
1659 1660 1661 1662
	ssize_t (*copy_file_range)(struct file *, loff_t, struct file *,
			loff_t, size_t, unsigned int);
	int (*clone_file_range)(struct file *, loff_t, struct file *, loff_t,
			u64);
1663 1664
	ssize_t (*dedupe_file_range)(struct file *, u64, u64, struct file *,
			u64);
L
Linus Torvalds 已提交
1665 1666 1667
};

struct inode_operations {
A
Al Viro 已提交
1668
	struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
1669
	const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *);
1670
	int (*permission) (struct inode *, int);
1671
	struct posix_acl * (*get_acl)(struct inode *, int);
1672 1673 1674

	int (*readlink) (struct dentry *, char __user *,int);

A
Al Viro 已提交
1675
	int (*create) (struct inode *,struct dentry *, umode_t, bool);
L
Linus Torvalds 已提交
1676 1677 1678
	int (*link) (struct dentry *,struct inode *,struct dentry *);
	int (*unlink) (struct inode *,struct dentry *);
	int (*symlink) (struct inode *,struct dentry *,const char *);
1679
	int (*mkdir) (struct inode *,struct dentry *,umode_t);
L
Linus Torvalds 已提交
1680
	int (*rmdir) (struct inode *,struct dentry *);
A
Al Viro 已提交
1681
	int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
L
Linus Torvalds 已提交
1682 1683
	int (*rename) (struct inode *, struct dentry *,
			struct inode *, struct dentry *);
M
Miklos Szeredi 已提交
1684 1685
	int (*rename2) (struct inode *, struct dentry *,
			struct inode *, struct dentry *, unsigned int);
L
Linus Torvalds 已提交
1686 1687 1688 1689 1690 1691
	int (*setattr) (struct dentry *, struct iattr *);
	int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
	int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
	ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
	ssize_t (*listxattr) (struct dentry *, char *, size_t);
	int (*removexattr) (struct dentry *, const char *);
M
Mark Fasheh 已提交
1692 1693
	int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
		      u64 len);
1694
	int (*update_time)(struct inode *, struct timespec *, int);
A
Al Viro 已提交
1695
	int (*atomic_open)(struct inode *, struct dentry *,
A
Al Viro 已提交
1696
			   struct file *, unsigned open_flag,
A
Al Viro 已提交
1697
			   umode_t create_mode, int *opened);
1698
	int (*tmpfile) (struct inode *, struct dentry *, umode_t);
1699
	int (*set_acl)(struct inode *, struct posix_acl *, int);
1700
} ____cacheline_aligned;
L
Linus Torvalds 已提交
1701

B
Badari Pulavarty 已提交
1702
ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
C
Christopher Yeoh 已提交
1703 1704
			      unsigned long nr_segs, unsigned long fast_segs,
			      struct iovec *fast_pointer,
1705
			      struct iovec **ret_pointer);
B
Badari Pulavarty 已提交
1706

D
Dmitry Kasatkin 已提交
1707
extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *);
A
Al Viro 已提交
1708
extern ssize_t __vfs_write(struct file *, const char __user *, size_t, loff_t *);
L
Linus Torvalds 已提交
1709 1710 1711 1712 1713 1714
extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
		unsigned long, loff_t *);
extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
		unsigned long, loff_t *);
1715 1716
extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *,
				   loff_t, size_t, unsigned int);
1717 1718
extern int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
		struct file *file_out, loff_t pos_out, u64 len);
1719 1720
extern int vfs_dedupe_file_range(struct file *file,
				 struct file_dedupe_range *same);
L
Linus Torvalds 已提交
1721 1722 1723 1724 1725

struct super_operations {
   	struct inode *(*alloc_inode)(struct super_block *sb);
	void (*destroy_inode)(struct inode *);

1726
   	void (*dirty_inode) (struct inode *, int flags);
1727
	int (*write_inode) (struct inode *, struct writeback_control *wbc);
1728
	int (*drop_inode) (struct inode *);
A
Al Viro 已提交
1729
	void (*evict_inode) (struct inode *);
L
Linus Torvalds 已提交
1730 1731
	void (*put_super) (struct super_block *);
	int (*sync_fs)(struct super_block *sb, int wait);
1732
	int (*freeze_super) (struct super_block *);
1733
	int (*freeze_fs) (struct super_block *);
1734
	int (*thaw_super) (struct super_block *);
1735
	int (*unfreeze_fs) (struct super_block *);
1736
	int (*statfs) (struct dentry *, struct kstatfs *);
L
Linus Torvalds 已提交
1737
	int (*remount_fs) (struct super_block *, int *, char *);
1738
	void (*umount_begin) (struct super_block *);
L
Linus Torvalds 已提交
1739

1740
	int (*show_options)(struct seq_file *, struct dentry *);
1741
	int (*show_devname)(struct seq_file *, struct dentry *);
1742
	int (*show_path)(struct seq_file *, struct dentry *);
1743
	int (*show_stats)(struct seq_file *, struct dentry *);
1744
#ifdef CONFIG_QUOTA
L
Linus Torvalds 已提交
1745 1746
	ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
	ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1747
	struct dquot **(*get_dquots)(struct inode *);
1748
#endif
1749
	int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
1750 1751 1752 1753
	long (*nr_cached_objects)(struct super_block *,
				  struct shrink_control *);
	long (*free_cached_objects)(struct super_block *,
				    struct shrink_control *);
L
Linus Torvalds 已提交
1754 1755
};

D
David Howells 已提交
1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771
/*
 * Inode flags - they have no relation to superblock flags now
 */
#define S_SYNC		1	/* Writes are synced at once */
#define S_NOATIME	2	/* Do not update access times */
#define S_APPEND	4	/* Append-only file */
#define S_IMMUTABLE	8	/* Immutable file */
#define S_DEAD		16	/* removed, but still open directory */
#define S_NOQUOTA	32	/* Inode is not counted to quota */
#define S_DIRSYNC	64	/* Directory modifications are synchronous */
#define S_NOCMTIME	128	/* Do not update file c/mtime */
#define S_SWAPFILE	256	/* Do not truncate: swapon got its bmaps */
#define S_PRIVATE	512	/* Inode is fs-internal */
#define S_IMA		1024	/* Inode has an associated IMA struct */
#define S_AUTOMOUNT	2048	/* Automount/referral quasi-directory */
#define S_NOSEC		4096	/* no suid or xattr security attributes */
1772
#ifdef CONFIG_FS_DAX
1773 1774 1775 1776
#define S_DAX		8192	/* Direct Access, avoiding the page cache */
#else
#define S_DAX		0	/* Make all the DAX code disappear */
#endif
D
David Howells 已提交
1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813

/*
 * Note that nosuid etc flags are inode-specific: setting some file-system
 * flags just means all the inodes inherit those flags by default. It might be
 * possible to override it selectively if you really wanted to with some
 * ioctl() that is not currently implemented.
 *
 * Exception: MS_RDONLY is always applied to the entire file system.
 *
 * Unfortunately, it is possible to change a filesystems flags with it mounted
 * with files in use.  This means that all of the inodes will not have their
 * i_flags updated.  Hence, i_flags no longer inherit the superblock mount
 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
 */
#define __IS_FLG(inode, flg)	((inode)->i_sb->s_flags & (flg))

#define IS_RDONLY(inode)	((inode)->i_sb->s_flags & MS_RDONLY)
#define IS_SYNC(inode)		(__IS_FLG(inode, MS_SYNCHRONOUS) || \
					((inode)->i_flags & S_SYNC))
#define IS_DIRSYNC(inode)	(__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
					((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
#define IS_MANDLOCK(inode)	__IS_FLG(inode, MS_MANDLOCK)
#define IS_NOATIME(inode)	__IS_FLG(inode, MS_RDONLY|MS_NOATIME)
#define IS_I_VERSION(inode)	__IS_FLG(inode, MS_I_VERSION)

#define IS_NOQUOTA(inode)	((inode)->i_flags & S_NOQUOTA)
#define IS_APPEND(inode)	((inode)->i_flags & S_APPEND)
#define IS_IMMUTABLE(inode)	((inode)->i_flags & S_IMMUTABLE)
#define IS_POSIXACL(inode)	__IS_FLG(inode, MS_POSIXACL)

#define IS_DEADDIR(inode)	((inode)->i_flags & S_DEAD)
#define IS_NOCMTIME(inode)	((inode)->i_flags & S_NOCMTIME)
#define IS_SWAPFILE(inode)	((inode)->i_flags & S_SWAPFILE)
#define IS_PRIVATE(inode)	((inode)->i_flags & S_PRIVATE)
#define IS_IMA(inode)		((inode)->i_flags & S_IMA)
#define IS_AUTOMOUNT(inode)	((inode)->i_flags & S_AUTOMOUNT)
#define IS_NOSEC(inode)		((inode)->i_flags & S_NOSEC)
1814
#define IS_DAX(inode)		((inode)->i_flags & S_DAX)
D
David Howells 已提交
1815

M
Miklos Szeredi 已提交
1816 1817 1818
#define IS_WHITEOUT(inode)	(S_ISCHR(inode->i_mode) && \
				 (inode)->i_rdev == WHITEOUT_DEV)

J
Joern Engel 已提交
1819
/*
1820
 * Inode state bits.  Protected by inode->i_lock
J
Joern Engel 已提交
1821 1822 1823 1824 1825 1826 1827 1828
 *
 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
 *
 * Four bits define the lifetime of an inode.  Initially, inodes are I_NEW,
 * until that flag is cleared.  I_WILL_FREE, I_FREEING and I_CLEAR are set at
 * various stages of removing an inode.
 *
C
Christoph Hellwig 已提交
1829
 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
J
Joern Engel 已提交
1830
 *
J
Joern Engel 已提交
1831 1832
 * I_DIRTY_SYNC		Inode is dirty, but doesn't have to be written on
 *			fdatasync().  i_atime is the usual cause.
1833 1834 1835 1836
 * I_DIRTY_DATASYNC	Data-related inode changes pending. We keep track of
 *			these changes separately from I_DIRTY_SYNC so that we
 *			don't have to write inode on fdatasync() when only
 *			mtime has changed in it.
J
Joern Engel 已提交
1837
 * I_DIRTY_PAGES	Inode has dirty pages.  Inode itself may be clean.
C
Christoph Hellwig 已提交
1838 1839 1840 1841 1842 1843 1844 1845
 * I_NEW		Serves as both a mutex and completion notification.
 *			New inodes set I_NEW.  If two processes both create
 *			the same inode, one of them will release its inode and
 *			wait for I_NEW to be released before returning.
 *			Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
 *			also cause waiting on I_NEW, without I_NEW actually
 *			being set.  find_inode() uses this to prevent returning
 *			nearly-dead inodes.
J
Joern Engel 已提交
1846 1847 1848 1849 1850 1851
 * I_WILL_FREE		Must be set when calling write_inode_now() if i_count
 *			is zero.  I_FREEING must be set when I_WILL_FREE is
 *			cleared.
 * I_FREEING		Set when inode is about to be freed but still has dirty
 *			pages or buffers attached or the inode itself is still
 *			dirty.
1852 1853
 * I_CLEAR		Added by clear_inode().  In this state the inode is
 *			clean and can be destroyed.  Inode keeps I_FREEING.
J
Joern Engel 已提交
1854 1855 1856 1857 1858
 *
 *			Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
 *			prohibited for many purposes.  iget() must wait for
 *			the inode to be completely released, then create it
 *			anew.  Other functions will just ignore such inodes,
C
Christoph Hellwig 已提交
1859
 *			if appropriate.  I_NEW is used for waiting.
J
Joern Engel 已提交
1860
 *
1861 1862 1863 1864
 * I_SYNC		Writeback of inode is running. The bit is set during
 *			data writeback, and cleared with a wakeup on the bit
 *			address once it is done. The bit is also used to pin
 *			the inode in memory for flusher thread.
J
Joern Engel 已提交
1865
 *
C
Christoph Hellwig 已提交
1866 1867 1868 1869
 * I_REFERENCED		Marks the inode as recently references on the LRU list.
 *
 * I_DIO_WAKEUP		Never set.  Only used as a key for wait_on_bit().
 *
1870 1871 1872 1873 1874
 * I_WB_SWITCH		Cgroup bdi_writeback switching in progress.  Used to
 *			synchronize competing switching instances and to tell
 *			wb stat updates to grab mapping->tree_lock.  See
 *			inode_switch_wb_work_fn() for details.
 *
J
Joern Engel 已提交
1875 1876
 * Q: What is the difference between I_WILL_FREE and I_FREEING?
 */
1877 1878 1879
#define I_DIRTY_SYNC		(1 << 0)
#define I_DIRTY_DATASYNC	(1 << 1)
#define I_DIRTY_PAGES		(1 << 2)
C
Christoph Hellwig 已提交
1880 1881
#define __I_NEW			3
#define I_NEW			(1 << __I_NEW)
1882 1883 1884
#define I_WILL_FREE		(1 << 4)
#define I_FREEING		(1 << 5)
#define I_CLEAR			(1 << 6)
C
Christoph Hellwig 已提交
1885
#define __I_SYNC		7
J
Joern Engel 已提交
1886
#define I_SYNC			(1 << __I_SYNC)
1887
#define I_REFERENCED		(1 << 8)
C
Christoph Hellwig 已提交
1888
#define __I_DIO_WAKEUP		9
E
Eric Sandeen 已提交
1889
#define I_DIO_WAKEUP		(1 << __I_DIO_WAKEUP)
1890
#define I_LINKABLE		(1 << 10)
1891 1892 1893
#define I_DIRTY_TIME		(1 << 11)
#define __I_DIRTY_TIME_EXPIRED	12
#define I_DIRTY_TIME_EXPIRED	(1 << __I_DIRTY_TIME_EXPIRED)
1894
#define I_WB_SWITCH		(1 << 13)
L
Linus Torvalds 已提交
1895 1896

#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1897
#define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME)
L
Linus Torvalds 已提交
1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909

extern void __mark_inode_dirty(struct inode *, int);
static inline void mark_inode_dirty(struct inode *inode)
{
	__mark_inode_dirty(inode, I_DIRTY);
}

static inline void mark_inode_dirty_sync(struct inode *inode)
{
	__mark_inode_dirty(inode, I_DIRTY_SYNC);
}

M
Miklos Szeredi 已提交
1910 1911 1912 1913
extern void inc_nlink(struct inode *inode);
extern void drop_nlink(struct inode *inode);
extern void clear_nlink(struct inode *inode);
extern void set_nlink(struct inode *inode, unsigned int nlink);
1914 1915 1916 1917

static inline void inode_inc_link_count(struct inode *inode)
{
	inc_nlink(inode);
1918 1919 1920
	mark_inode_dirty(inode);
}

1921 1922 1923
static inline void inode_dec_link_count(struct inode *inode)
{
	drop_nlink(inode);
1924 1925 1926
	mark_inode_dirty(inode);
}

1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941
/**
 * inode_inc_iversion - increments i_version
 * @inode: inode that need to be updated
 *
 * Every time the inode is modified, the i_version field will be incremented.
 * The filesystem has to be mounted with i_version flag
 */

static inline void inode_inc_iversion(struct inode *inode)
{
       spin_lock(&inode->i_lock);
       inode->i_version++;
       spin_unlock(&inode->i_lock);
}

1942 1943 1944 1945 1946 1947 1948
enum file_time_flags {
	S_ATIME = 1,
	S_MTIME = 2,
	S_CTIME = 4,
	S_VERSION = 8,
};

1949
extern bool atime_needs_update(const struct path *, struct inode *);
A
Al Viro 已提交
1950
extern void touch_atime(const struct path *);
L
Linus Torvalds 已提交
1951 1952 1953
static inline void file_accessed(struct file *file)
{
	if (!(file->f_flags & O_NOATIME))
A
Al Viro 已提交
1954
		touch_atime(&file->f_path);
L
Linus Torvalds 已提交
1955 1956 1957
}

int sync_inode(struct inode *inode, struct writeback_control *wbc);
C
Christoph Hellwig 已提交
1958
int sync_inode_metadata(struct inode *inode, int wait);
L
Linus Torvalds 已提交
1959 1960 1961 1962

struct file_system_type {
	const char *name;
	int fs_flags;
D
David Howells 已提交
1963 1964 1965
#define FS_REQUIRES_DEV		1 
#define FS_BINARY_MOUNTDATA	2
#define FS_HAS_SUBTYPE		4
1966 1967
#define FS_USERNS_MOUNT		8	/* Can be mounted by userns root */
#define FS_USERNS_DEV_MOUNT	16 /* A userns mount does not imply MNT_NODEV */
1968
#define FS_USERNS_VISIBLE	32	/* FS must already be visible */
D
David Howells 已提交
1969
#define FS_RENAME_DOES_D_MOVE	32768	/* FS will handle d_move() during rename() internally. */
A
Al Viro 已提交
1970 1971
	struct dentry *(*mount) (struct file_system_type *, int,
		       const char *, void *);
L
Linus Torvalds 已提交
1972 1973 1974
	void (*kill_sb) (struct super_block *);
	struct module *owner;
	struct file_system_type * next;
A
Al Viro 已提交
1975
	struct hlist_head fs_supers;
1976

I
Ingo Molnar 已提交
1977
	struct lock_class_key s_lock_key;
1978
	struct lock_class_key s_umount_key;
1979
	struct lock_class_key s_vfs_rename_key;
1980
	struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];
1981 1982 1983

	struct lock_class_key i_lock_key;
	struct lock_class_key i_mutex_key;
1984
	struct lock_class_key i_mutex_dir_key;
L
Linus Torvalds 已提交
1985 1986
};

1987 1988
#define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)

A
Al Viro 已提交
1989 1990
extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags,
	void *data, int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
1991 1992 1993
extern struct dentry *mount_bdev(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data,
	int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
1994 1995 1996
extern struct dentry *mount_single(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
1997 1998 1999
extern struct dentry *mount_nodev(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
2000
extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
L
Linus Torvalds 已提交
2001 2002 2003 2004 2005
void generic_shutdown_super(struct super_block *sb);
void kill_block_super(struct super_block *sb);
void kill_anon_super(struct super_block *sb);
void kill_litter_super(struct super_block *sb);
void deactivate_super(struct super_block *sb);
A
Al Viro 已提交
2006
void deactivate_locked_super(struct super_block *sb);
L
Linus Torvalds 已提交
2007
int set_anon_super(struct super_block *s, void *data);
2008 2009
int get_anon_bdev(dev_t *);
void free_anon_bdev(dev_t);
L
Linus Torvalds 已提交
2010 2011 2012
struct super_block *sget(struct file_system_type *type,
			int (*test)(struct super_block *,void *),
			int (*set)(struct super_block *,void *),
D
David Howells 已提交
2013
			int flags, void *data);
A
Al Viro 已提交
2014
extern struct dentry *mount_pseudo(struct file_system_type *, char *,
2015 2016 2017
	const struct super_operations *ops,
	const struct dentry_operations *dops,
	unsigned long);
L
Linus Torvalds 已提交
2018 2019 2020 2021 2022 2023

/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
#define fops_get(fops) \
	(((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
#define fops_put(fops) \
	do { if (fops) module_put((fops)->owner); } while(0)
2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034
/*
 * This one is to be used *ONLY* from ->open() instances.
 * fops must be non-NULL, pinned down *and* module dependencies
 * should be sufficient to pin the caller down as well.
 */
#define replace_fops(f, fops) \
	do {	\
		struct file *__file = (f); \
		fops_put(__file->f_op); \
		BUG_ON(!(__file->f_op = (fops))); \
	} while(0)
L
Linus Torvalds 已提交
2035 2036 2037

extern int register_filesystem(struct file_system_type *);
extern int unregister_filesystem(struct file_system_type *);
2038 2039
extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
#define kern_mount(type) kern_mount_data(type, NULL)
2040
extern void kern_unmount(struct vfsmount *mnt);
L
Linus Torvalds 已提交
2041 2042
extern int may_umount_tree(struct vfsmount *);
extern int may_umount(struct vfsmount *);
2043 2044
extern long do_mount(const char *, const char __user *,
		     const char *, unsigned long, void *);
A
Al Viro 已提交
2045
extern struct vfsmount *collect_mounts(struct path *);
2046
extern void drop_collected_mounts(struct vfsmount *);
A
Al Viro 已提交
2047 2048
extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
			  struct vfsmount *);
2049
extern int vfs_statfs(struct path *, struct kstatfs *);
A
Al Viro 已提交
2050 2051
extern int user_statfs(const char __user *, struct kstatfs *);
extern int fd_statfs(int, struct kstatfs *);
A
Al Viro 已提交
2052
extern int vfs_ustat(dev_t, struct kstatfs *);
2053 2054
extern int freeze_super(struct super_block *super);
extern int thaw_super(struct super_block *super);
2055
extern bool our_mnt(struct vfsmount *mnt);
L
Linus Torvalds 已提交
2056

A
Al Viro 已提交
2057 2058
extern int current_umask(void);

2059 2060
extern void ihold(struct inode * inode);
extern void iput(struct inode *);
2061
extern int generic_update_time(struct inode *, struct timespec *, int);
2062

M
Miklos Szeredi 已提交
2063
/* /sys/fs */
2064
extern struct kobject *fs_kobj;
M
Miklos Szeredi 已提交
2065

2066
#define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
2067

2068
#ifdef CONFIG_MANDATORY_FILE_LOCKING
2069
extern int locks_mandatory_locked(struct file *);
2070
extern int locks_mandatory_area(struct inode *, struct file *, loff_t, loff_t, unsigned char);
L
Linus Torvalds 已提交
2071 2072 2073 2074 2075

/*
 * Candidates for mandatory locking have the setgid bit set
 * but no group execute bit -  an otherwise meaningless combination.
 */
2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090

static inline int __mandatory_lock(struct inode *ino)
{
	return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
}

/*
 * ... and these candidates should be on MS_MANDLOCK mounted fs,
 * otherwise these will be advisory locks
 */

static inline int mandatory_lock(struct inode *ino)
{
	return IS_MANDLOCK(ino) && __mandatory_lock(ino);
}
L
Linus Torvalds 已提交
2091

2092
static inline int locks_verify_locked(struct file *file)
L
Linus Torvalds 已提交
2093
{
2094 2095
	if (mandatory_lock(file_inode(file)))
		return locks_mandatory_locked(file);
L
Linus Torvalds 已提交
2096 2097 2098 2099
	return 0;
}

static inline int locks_verify_truncate(struct inode *inode,
2100
				    struct file *f,
L
Linus Torvalds 已提交
2101 2102
				    loff_t size)
{
2103 2104 2105 2106 2107 2108 2109 2110 2111 2112
	if (!inode->i_flctx || !mandatory_lock(inode))
		return 0;

	if (size < inode->i_size) {
		return locks_mandatory_area(inode, f, size, inode->i_size - 1,
				F_WRLCK);
	} else {
		return locks_mandatory_area(inode, f, inode->i_size, size - 1,
				F_WRLCK);
	}
L
Linus Torvalds 已提交
2113 2114
}

2115 2116 2117 2118 2119 2120 2121
#else /* !CONFIG_MANDATORY_FILE_LOCKING */

static inline int locks_mandatory_locked(struct file *file)
{
	return 0;
}

2122 2123
static inline int locks_mandatory_area(struct inode *inode, struct file *filp,
                                       loff_t start, loff_t end, unsigned char type)
2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152
{
	return 0;
}

static inline int __mandatory_lock(struct inode *inode)
{
	return 0;
}

static inline int mandatory_lock(struct inode *inode)
{
	return 0;
}

static inline int locks_verify_locked(struct file *file)
{
	return 0;
}

static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
					size_t size)
{
	return 0;
}

#endif /* CONFIG_MANDATORY_FILE_LOCKING */


#ifdef CONFIG_FILE_LOCKING
L
Linus Torvalds 已提交
2153 2154
static inline int break_lease(struct inode *inode, unsigned int mode)
{
2155 2156
	/*
	 * Since this check is lockless, we must ensure that any refcounts
2157 2158 2159
	 * taken are done before checking i_flctx->flc_lease. Otherwise, we
	 * could end up racing with tasks trying to set a new lease on this
	 * file.
2160 2161
	 */
	smp_mb();
2162
	if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
J
J. Bruce Fields 已提交
2163
		return __break_lease(inode, mode, FL_LEASE);
L
Linus Torvalds 已提交
2164 2165
	return 0;
}
J
J. Bruce Fields 已提交
2166 2167 2168

static inline int break_deleg(struct inode *inode, unsigned int mode)
{
2169 2170
	/*
	 * Since this check is lockless, we must ensure that any refcounts
2171 2172 2173
	 * taken are done before checking i_flctx->flc_lease. Otherwise, we
	 * could end up racing with tasks trying to set a new lease on this
	 * file.
2174 2175
	 */
	smp_mb();
2176
	if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
J
J. Bruce Fields 已提交
2177
		return __break_lease(inode, mode, FL_DELEG);
L
Linus Torvalds 已提交
2178 2179
	return 0;
}
J
J. Bruce Fields 已提交
2180

2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202
static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
{
	int ret;

	ret = break_deleg(inode, O_WRONLY|O_NONBLOCK);
	if (ret == -EWOULDBLOCK && delegated_inode) {
		*delegated_inode = inode;
		ihold(inode);
	}
	return ret;
}

static inline int break_deleg_wait(struct inode **delegated_inode)
{
	int ret;

	ret = break_deleg(*delegated_inode, O_WRONLY);
	iput(*delegated_inode);
	*delegated_inode = NULL;
	return ret;
}

C
Christoph Hellwig 已提交
2203 2204 2205 2206 2207 2208 2209 2210 2211 2212
static inline int break_layout(struct inode *inode, bool wait)
{
	smp_mb();
	if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
		return __break_lease(inode,
				wait ? O_WRONLY : O_WRONLY | O_NONBLOCK,
				FL_LAYOUT);
	return 0;
}

2213
#else /* !CONFIG_FILE_LOCKING */
2214 2215 2216 2217 2218
static inline int break_lease(struct inode *inode, unsigned int mode)
{
	return 0;
}

J
J. Bruce Fields 已提交
2219 2220 2221 2222
static inline int break_deleg(struct inode *inode, unsigned int mode)
{
	return 0;
}
2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234

static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
{
	return 0;
}

static inline int break_deleg_wait(struct inode **delegated_inode)
{
	BUG();
	return 0;
}

C
Christoph Hellwig 已提交
2235 2236 2237 2238 2239
static inline int break_layout(struct inode *inode, bool wait)
{
	return 0;
}

2240
#endif /* CONFIG_FILE_LOCKING */
L
Linus Torvalds 已提交
2241 2242

/* fs/open.c */
2243
struct audit_names;
2244
struct filename {
2245 2246 2247
	const char		*name;	/* pointer to actual string */
	const __user char	*uptr;	/* original userland pointer */
	struct audit_names	*aname;
2248
	int			refcnt;
A
Al Viro 已提交
2249
	const char		iname[];
2250
};
L
Linus Torvalds 已提交
2251

2252
extern long vfs_truncate(struct path *, loff_t);
2253 2254
extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
		       struct file *filp);
2255
extern int vfs_fallocate(struct file *file, int mode, loff_t offset,
2256
			loff_t len);
J
Jason Uhlenkott 已提交
2257
extern long do_sys_open(int dfd, const char __user *filename, int flags,
2258
			umode_t mode);
2259
extern struct file *file_open_name(struct filename *, int, umode_t);
2260
extern struct file *filp_open(const char *, int, umode_t);
A
Al Viro 已提交
2261 2262
extern struct file *file_open_root(struct dentry *, struct vfsmount *,
				   const char *, int);
2263
extern struct file * dentry_open(const struct path *, int, const struct cred *);
L
Linus Torvalds 已提交
2264
extern int filp_close(struct file *, fl_owner_t id);
2265

2266
extern struct filename *getname_flags(const char __user *, int, int *);
2267
extern struct filename *getname(const char __user *);
2268
extern struct filename *getname_kernel(const char *);
2269
extern void putname(struct filename *name);
2270

2271 2272 2273 2274
enum {
	FILE_CREATED = 1,
	FILE_OPENED = 2
};
A
Al Viro 已提交
2275 2276 2277
extern int finish_open(struct file *file, struct dentry *dentry,
			int (*open)(struct inode *, struct file *),
			int *opened);
A
Al Viro 已提交
2278
extern int finish_no_open(struct file *file, struct dentry *dentry);
L
Linus Torvalds 已提交
2279

2280 2281 2282 2283
/* fs/ioctl.c */

extern int ioctl_preallocate(struct file *filp, void __user *argp);

L
Linus Torvalds 已提交
2284 2285
/* fs/dcache.c */
extern void __init vfs_caches_init_early(void);
2286
extern void __init vfs_caches_init(void);
L
Linus Torvalds 已提交
2287

2288 2289
extern struct kmem_cache *names_cachep;

2290
#define __getname()		kmem_cache_alloc(names_cachep, GFP_KERNEL)
V
Vegard Nossum 已提交
2291
#define __putname(name)		kmem_cache_free(names_cachep, (void *)(name))
L
Linus Torvalds 已提交
2292

2293
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2294
extern int register_blkdev(unsigned int, const char *);
A
Akinobu Mita 已提交
2295
extern void unregister_blkdev(unsigned int, const char *);
L
Linus Torvalds 已提交
2296
extern struct block_device *bdget(dev_t);
2297
extern struct block_device *bdgrab(struct block_device *bdev);
L
Linus Torvalds 已提交
2298 2299 2300
extern void bd_set_size(struct block_device *, loff_t size);
extern void bd_forget(struct inode *inode);
extern void bdput(struct block_device *);
N
Nick Piggin 已提交
2301
extern void invalidate_bdev(struct block_device *);
2302
extern void iterate_bdevs(void (*)(struct block_device *, void *), void *);
N
Nick Piggin 已提交
2303
extern int sync_blockdev(struct block_device *bdev);
A
Al Viro 已提交
2304
extern void kill_bdev(struct block_device *);
N
Nick Piggin 已提交
2305
extern struct super_block *freeze_bdev(struct block_device *);
2306
extern void emergency_thaw_all(void);
N
Nick Piggin 已提交
2307 2308
extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
extern int fsync_bdev(struct block_device *);
2309 2310 2311 2312 2313 2314 2315 2316
#ifdef CONFIG_FS_DAX
extern bool blkdev_dax_capable(struct block_device *bdev);
#else
static inline bool blkdev_dax_capable(struct block_device *bdev)
{
	return false;
}
#endif
T
Tejun Heo 已提交
2317 2318 2319 2320 2321 2322 2323

extern struct super_block *blockdev_superblock;

static inline bool sb_is_blkdev_sb(struct super_block *sb)
{
	return sb == blockdev_superblock;
}
2324 2325
#else
static inline void bd_forget(struct inode *inode) {}
2326
static inline int sync_blockdev(struct block_device *bdev) { return 0; }
A
Al Viro 已提交
2327
static inline void kill_bdev(struct block_device *bdev) {}
2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338
static inline void invalidate_bdev(struct block_device *bdev) {}

static inline struct super_block *freeze_bdev(struct block_device *sb)
{
	return NULL;
}

static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
{
	return 0;
}
2339 2340 2341 2342

static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg)
{
}
2343

2344
static inline bool sb_is_blkdev_sb(struct super_block *sb)
2345
{
2346
	return false;
2347
}
2348
#endif
2349
extern int sync_filesystem(struct super_block *);
2350
extern const struct file_operations def_blk_fops;
2351
extern const struct file_operations def_chr_fops;
2352
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2353
extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
2354
extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
L
Linus Torvalds 已提交
2355
extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
2356
extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
2357 2358 2359 2360
extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
					       void *holder);
extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
					      void *holder);
A
Al Viro 已提交
2361
extern void blkdev_put(struct block_device *bdev, fmode_t mode);
2362 2363 2364
extern int __blkdev_reread_part(struct block_device *bdev);
extern int blkdev_reread_part(struct block_device *bdev);

2365
#ifdef CONFIG_SYSFS
2366
extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
2367 2368
extern void bd_unlink_disk_holder(struct block_device *bdev,
				  struct gendisk *disk);
2369
#else
2370 2371 2372 2373 2374
static inline int bd_link_disk_holder(struct block_device *bdev,
				      struct gendisk *disk)
{
	return 0;
}
2375 2376 2377 2378
static inline void bd_unlink_disk_holder(struct block_device *bdev,
					 struct gendisk *disk)
{
}
2379
#endif
2380
#endif
L
Linus Torvalds 已提交
2381 2382

/* fs/char_dev.c */
2383
#define CHRDEV_MAJOR_HASH_SIZE	255
L
Linus Torvalds 已提交
2384 2385
extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
extern int register_chrdev_region(dev_t, unsigned, const char *);
2386 2387 2388 2389 2390
extern int __register_chrdev(unsigned int major, unsigned int baseminor,
			     unsigned int count, const char *name,
			     const struct file_operations *fops);
extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
				unsigned int count, const char *name);
L
Linus Torvalds 已提交
2391
extern void unregister_chrdev_region(dev_t, unsigned);
2392
extern void chrdev_show(struct seq_file *,off_t);
L
Linus Torvalds 已提交
2393

2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404
static inline int register_chrdev(unsigned int major, const char *name,
				  const struct file_operations *fops)
{
	return __register_chrdev(major, 0, 256, name, fops);
}

static inline void unregister_chrdev(unsigned int major, const char *name)
{
	__unregister_chrdev(major, 0, 256, name);
}

L
Linus Torvalds 已提交
2405 2406
/* fs/block_dev.c */
#define BDEVNAME_SIZE	32	/* Largest string for a blockdev identifier */
2407
#define BDEVT_SIZE	10	/* Largest string for MAJ:MIN for blkdev */
2408 2409 2410

#ifdef CONFIG_BLOCK
#define BLKDEV_MAJOR_HASH_SIZE	255
L
Linus Torvalds 已提交
2411 2412 2413
extern const char *__bdevname(dev_t, char *buffer);
extern const char *bdevname(struct block_device *bdev, char *buffer);
extern struct block_device *lookup_bdev(const char *);
2414
extern void blkdev_show(struct seq_file *,off_t);
2415

2416 2417 2418
#else
#define BLKDEV_MAJOR_HASH_SIZE	0
#endif
L
Linus Torvalds 已提交
2419 2420 2421 2422 2423

extern void init_special_inode(struct inode *, umode_t, dev_t);

/* Invalid inode operations -- fs/bad_inode.c */
extern void make_bad_inode(struct inode *);
2424
extern bool is_bad_inode(struct inode *);
L
Linus Torvalds 已提交
2425

2426
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
/*
 * return READ, READA, or WRITE
 */
#define bio_rw(bio)		((bio)->bi_rw & (RW_MASK | RWA_MASK))

/*
 * return data direction, READ or WRITE
 */
#define bio_data_dir(bio)	((bio)->bi_rw & 1)

2437 2438
extern void check_disk_size_change(struct gendisk *disk,
				   struct block_device *bdev);
2439
extern int revalidate_disk(struct gendisk *);
L
Linus Torvalds 已提交
2440
extern int check_disk_change(struct block_device *);
2441
extern int __invalidate_device(struct block_device *, bool);
L
Linus Torvalds 已提交
2442
extern int invalidate_partition(struct gendisk *, int);
2443
#endif
L
Linus Torvalds 已提交
2444 2445
unsigned long invalidate_mapping_pages(struct address_space *mapping,
					pgoff_t start, pgoff_t end);
2446

L
Linus Torvalds 已提交
2447 2448 2449 2450
static inline void invalidate_remote_inode(struct inode *inode)
{
	if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
	    S_ISLNK(inode->i_mode))
2451
		invalidate_mapping_pages(inode->i_mapping, 0, -1);
L
Linus Torvalds 已提交
2452 2453 2454 2455 2456 2457 2458 2459
}
extern int invalidate_inode_pages2(struct address_space *mapping);
extern int invalidate_inode_pages2_range(struct address_space *mapping,
					 pgoff_t start, pgoff_t end);
extern int write_inode_now(struct inode *, int);
extern int filemap_fdatawrite(struct address_space *);
extern int filemap_flush(struct address_space *);
extern int filemap_fdatawait(struct address_space *);
2460
extern void filemap_fdatawait_keep_errors(struct address_space *);
2461 2462
extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
				   loff_t lend);
L
Linus Torvalds 已提交
2463 2464 2465
extern int filemap_write_and_wait(struct address_space *mapping);
extern int filemap_write_and_wait_range(struct address_space *mapping,
				        loff_t lstart, loff_t lend);
2466 2467
extern int __filemap_fdatawrite_range(struct address_space *mapping,
				loff_t start, loff_t end, int sync_mode);
2468 2469
extern int filemap_fdatawrite_range(struct address_space *mapping,
				loff_t start, loff_t end);
2470

2471 2472 2473
extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
			   int datasync);
extern int vfs_fsync(struct file *file, int datasync);
2474 2475 2476 2477 2478 2479 2480
static inline int generic_write_sync(struct file *file, loff_t pos, loff_t count)
{
	if (!(file->f_flags & O_DSYNC) && !IS_SYNC(file->f_mapping->host))
		return 0;
	return vfs_fsync_range(file, pos, pos + count - 1,
			       (file->f_flags & __O_SYNC) ? 0 : 1);
}
L
Linus Torvalds 已提交
2481 2482
extern void emergency_sync(void);
extern void emergency_remount(void);
2483
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2484
extern sector_t bmap(struct inode *, sector_t);
2485
#endif
2486
extern int notify_change(struct dentry *, struct iattr *, struct inode **);
2487
extern int inode_permission(struct inode *, int);
2488
extern int __inode_permission(struct inode *, int);
2489
extern int generic_permission(struct inode *, int);
M
Miklos Szeredi 已提交
2490
extern int __check_sticky(struct inode *dir, struct inode *inode);
L
Linus Torvalds 已提交
2491

2492 2493 2494 2495 2496
static inline bool execute_ok(struct inode *inode)
{
	return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
}

2497 2498 2499 2500 2501 2502 2503
static inline void file_start_write(struct file *file)
{
	if (!S_ISREG(file_inode(file)->i_mode))
		return;
	__sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true);
}

2504 2505 2506 2507 2508 2509 2510
static inline bool file_start_write_trylock(struct file *file)
{
	if (!S_ISREG(file_inode(file)->i_mode))
		return true;
	return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false);
}

2511 2512 2513 2514 2515 2516 2517
static inline void file_end_write(struct file *file)
{
	if (!S_ISREG(file_inode(file)->i_mode))
		return;
	__sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE);
}

2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539
/*
 * get_write_access() gets write permission for a file.
 * put_write_access() releases this write permission.
 * This is used for regular files.
 * We cannot support write (and maybe mmap read-write shared) accesses and
 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
 * can have the following values:
 * 0: no writers, no VM_DENYWRITE mappings
 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
 * > 0: (i_writecount) users are writing to the file.
 *
 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
 * except for the cases where we don't hold i_writecount yet. Then we need to
 * use {get,deny}_write_access() - these functions check the sign and refuse
 * to do the change if sign is wrong.
 */
static inline int get_write_access(struct inode *inode)
{
	return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY;
}
static inline int deny_write_access(struct file *file)
{
A
Al Viro 已提交
2540
	struct inode *inode = file_inode(file);
2541 2542
	return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
}
L
Linus Torvalds 已提交
2543 2544 2545 2546 2547 2548 2549
static inline void put_write_access(struct inode * inode)
{
	atomic_dec(&inode->i_writecount);
}
static inline void allow_write_access(struct file *file)
{
	if (file)
A
Al Viro 已提交
2550
		atomic_inc(&file_inode(file)->i_writecount);
L
Linus Torvalds 已提交
2551
}
2552 2553 2554 2555 2556
static inline bool inode_is_open_for_write(const struct inode *inode)
{
	return atomic_read(&inode->i_writecount) > 0;
}

M
Mimi Zohar 已提交
2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576
#ifdef CONFIG_IMA
static inline void i_readcount_dec(struct inode *inode)
{
	BUG_ON(!atomic_read(&inode->i_readcount));
	atomic_dec(&inode->i_readcount);
}
static inline void i_readcount_inc(struct inode *inode)
{
	atomic_inc(&inode->i_readcount);
}
#else
static inline void i_readcount_dec(struct inode *inode)
{
	return;
}
static inline void i_readcount_inc(struct inode *inode)
{
	return;
}
#endif
U
Ulrich Drepper 已提交
2577
extern int do_pipe_flags(int *, int);
L
Linus Torvalds 已提交
2578

2579 2580 2581 2582
enum kernel_read_file_id {
	READING_MAX_ID
};

M
Mimi Zohar 已提交
2583
extern int kernel_read(struct file *, loff_t, char *, unsigned long);
2584 2585
extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
			    enum kernel_read_file_id);
2586 2587
extern int kernel_read_file_from_path(char *, void **, loff_t *, loff_t,
				      enum kernel_read_file_id);
2588
extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t);
A
Al Viro 已提交
2589
extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
L
Linus Torvalds 已提交
2590 2591 2592
extern struct file * open_exec(const char *);
 
/* fs/dcache.c -- generic fs support functions */
Y
Yaowei Bai 已提交
2593
extern bool is_subdir(struct dentry *, struct dentry *);
2594
extern bool path_is_under(struct path *, struct path *);
L
Linus Torvalds 已提交
2595

M
Miklos Szeredi 已提交
2596 2597
extern char *file_path(struct file *, char *, int);

L
Linus Torvalds 已提交
2598 2599 2600
#include <linux/err.h>

/* needed for stackable file system support */
2601
extern loff_t default_llseek(struct file *file, loff_t offset, int whence);
L
Linus Torvalds 已提交
2602

2603
extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence);
L
Linus Torvalds 已提交
2604

2605
extern int inode_init_always(struct super_block *, struct inode *);
L
Linus Torvalds 已提交
2606
extern void inode_init_once(struct inode *);
2607
extern void address_space_init_once(struct address_space *mapping);
L
Linus Torvalds 已提交
2608 2609 2610
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
extern int inode_needs_sync(struct inode *inode);
2611
extern int generic_delete_inode(struct inode *inode);
2612 2613 2614 2615
static inline int generic_drop_inode(struct inode *inode)
{
	return !inode->i_nlink || inode_unhashed(inode);
}
L
Linus Torvalds 已提交
2616

2617 2618 2619
extern struct inode *ilookup5_nowait(struct super_block *sb,
		unsigned long hashval, int (*test)(struct inode *, void *),
		void *data);
L
Linus Torvalds 已提交
2620 2621 2622 2623 2624 2625
extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
		int (*test)(struct inode *, void *), void *data);
extern struct inode *ilookup(struct super_block *sb, unsigned long ino);

extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
extern struct inode * iget_locked(struct super_block *, unsigned long);
2626 2627 2628 2629 2630
extern struct inode *find_inode_nowait(struct super_block *,
				       unsigned long,
				       int (*match)(struct inode *,
						    unsigned long, void *),
				       void *data);
A
Al Viro 已提交
2631 2632
extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
extern int insert_inode_locked(struct inode *);
2633 2634 2635 2636 2637
#ifdef CONFIG_DEBUG_LOCK_ALLOC
extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
#else
static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
#endif
L
Linus Torvalds 已提交
2638
extern void unlock_new_inode(struct inode *);
2639
extern unsigned int get_next_ino(void);
L
Linus Torvalds 已提交
2640 2641

extern void __iget(struct inode * inode);
2642
extern void iget_failed(struct inode *);
2643
extern void clear_inode(struct inode *);
C
Christoph Hellwig 已提交
2644
extern void __destroy_inode(struct inode *);
2645 2646
extern struct inode *new_inode_pseudo(struct super_block *sb);
extern struct inode *new_inode(struct super_block *sb);
2647
extern void free_inode_nonrcu(struct inode *inode);
2648
extern int should_remove_suid(struct dentry *);
2649
extern int file_remove_privs(struct file *);
2650 2651 2652 2653 2654
extern int dentry_needs_remove_privs(struct dentry *dentry);
static inline int file_needs_remove_privs(struct file *file)
{
	return dentry_needs_remove_privs(file->f_path.dentry);
}
L
Linus Torvalds 已提交
2655 2656

extern void __insert_inode_hash(struct inode *, unsigned long hashval);
2657 2658
static inline void insert_inode_hash(struct inode *inode)
{
L
Linus Torvalds 已提交
2659 2660
	__insert_inode_hash(inode, inode->i_ino);
}
2661 2662 2663 2664

extern void __remove_inode_hash(struct inode *);
static inline void remove_inode_hash(struct inode *inode)
{
2665
	if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash))
2666 2667 2668
		__remove_inode_hash(inode);
}

2669
extern void inode_sb_list_add(struct inode *inode);
L
Linus Torvalds 已提交
2670

2671
#ifdef CONFIG_BLOCK
2672
extern blk_qc_t submit_bio(int, struct bio *);
L
Linus Torvalds 已提交
2673
extern int bdev_read_only(struct block_device *);
2674
#endif
L
Linus Torvalds 已提交
2675 2676 2677 2678 2679 2680
extern int set_blocksize(struct block_device *, int);
extern int sb_set_blocksize(struct super_block *, int);
extern int sb_min_blocksize(struct super_block *, int);

extern int generic_file_mmap(struct file *, struct vm_area_struct *);
extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
2681
extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *);
A
Al Viro 已提交
2682
extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *);
2683 2684
extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *);
extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *);
A
Al Viro 已提交
2685
extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *, loff_t);
2686
extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t);
A
Andrew Morton 已提交
2687

2688 2689 2690
ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos);
ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos);

2691
/* fs/block_dev.c */
2692
extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to);
2693
extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from);
2694 2695
extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
			int datasync);
A
Al Viro 已提交
2696
extern void block_sync_page(struct page *page);
2697

A
Andrew Morton 已提交
2698
/* fs/splice.c */
2699
extern ssize_t generic_file_splice_read(struct file *, loff_t *,
A
Andrew Morton 已提交
2700
		struct pipe_inode_info *, size_t, unsigned int);
2701 2702
extern ssize_t default_file_splice_read(struct file *, loff_t *,
		struct pipe_inode_info *, size_t, unsigned int);
A
Al Viro 已提交
2703
extern ssize_t iter_file_splice_write(struct pipe_inode_info *,
2704
		struct file *, loff_t *, size_t, unsigned int);
A
Andrew Morton 已提交
2705
extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
2706
		struct file *out, loff_t *, size_t len, unsigned int flags);
2707 2708 2709
extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
		loff_t *opos, size_t len, unsigned int flags);

A
Andrew Morton 已提交
2710

L
Linus Torvalds 已提交
2711 2712
extern void
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
2713 2714
extern loff_t noop_llseek(struct file *file, loff_t offset, int whence);
extern loff_t no_llseek(struct file *file, loff_t offset, int whence);
J
Jie Liu 已提交
2715
extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize);
2716
extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence);
A
Andi Kleen 已提交
2717
extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
2718
		int whence, loff_t maxsize, loff_t eof);
A
Al Viro 已提交
2719 2720
extern loff_t fixed_size_llseek(struct file *file, loff_t offset,
		int whence, loff_t size);
2721 2722
extern loff_t no_seek_end_llseek_size(struct file *, loff_t, int, loff_t);
extern loff_t no_seek_end_llseek(struct file *, loff_t, int);
L
Linus Torvalds 已提交
2723 2724 2725
extern int generic_file_open(struct inode * inode, struct file * filp);
extern int nonseekable_open(struct inode * inode, struct file * filp);

2726
#ifdef CONFIG_BLOCK
2727 2728
typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
			    loff_t file_offset);
L
Linus Torvalds 已提交
2729 2730

enum {
2731 2732 2733 2734 2735
	/* need locking between buffered and direct access */
	DIO_LOCKING	= 0x01,

	/* filesystem does not support filling holes */
	DIO_SKIP_HOLES	= 0x02,
2736 2737 2738

	/* filesystem can handle aio writes beyond i_size */
	DIO_ASYNC_EXTEND = 0x04,
2739 2740 2741

	/* inode/fs/bdev does not need truncate protection */
	DIO_SKIP_DIO_COUNT = 0x08,
L
Linus Torvalds 已提交
2742 2743
};

2744 2745
void dio_end_io(struct bio *bio, int error);

2746 2747 2748 2749 2750
ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
			     struct block_device *bdev, struct iov_iter *iter,
			     loff_t offset, get_block_t get_block,
			     dio_iodone_t end_io, dio_submit_t submit_io,
			     int flags);
2751

2752 2753 2754 2755
static inline ssize_t blockdev_direct_IO(struct kiocb *iocb,
					 struct inode *inode,
					 struct iov_iter *iter, loff_t offset,
					 get_block_t get_block)
L
Linus Torvalds 已提交
2756
{
2757
	return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter,
2758
				    offset, get_block, NULL, NULL,
2759
				    DIO_LOCKING | DIO_SKIP_HOLES);
L
Linus Torvalds 已提交
2760
}
2761
#endif
L
Linus Torvalds 已提交
2762

2763
void inode_dio_wait(struct inode *inode);
2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788

/*
 * inode_dio_begin - signal start of a direct I/O requests
 * @inode: inode the direct I/O happens on
 *
 * This is called once we've finished processing a direct I/O request,
 * and is used to wake up callers waiting for direct I/O to be quiesced.
 */
static inline void inode_dio_begin(struct inode *inode)
{
	atomic_inc(&inode->i_dio_count);
}

/*
 * inode_dio_end - signal finish of a direct I/O requests
 * @inode: inode the direct I/O happens on
 *
 * This is called once we've finished processing a direct I/O request,
 * and is used to wake up callers waiting for direct I/O to be quiesced.
 */
static inline void inode_dio_end(struct inode *inode)
{
	if (atomic_dec_and_test(&inode->i_dio_count))
		wake_up_bit(&inode->i_state, __I_DIO_WAKEUP);
}
2789

2790 2791 2792
extern void inode_set_flags(struct inode *inode, unsigned int flags,
			    unsigned int mask);

2793
extern const struct file_operations generic_ro_fops;
L
Linus Torvalds 已提交
2794 2795 2796

#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))

A
Al Viro 已提交
2797
extern int readlink_copy(char __user *, int, const char *);
L
Linus Torvalds 已提交
2798
extern int page_readlink(struct dentry *, char __user *, int);
2799 2800 2801
extern const char *page_get_link(struct dentry *, struct inode *,
				 struct delayed_call *);
extern void page_put_link(void *);
2802
extern int __page_symlink(struct inode *inode, const char *symname, int len,
2803
		int nofs);
L
Linus Torvalds 已提交
2804
extern int page_symlink(struct inode *inode, const char *symname, int len);
2805
extern const struct inode_operations page_symlink_inode_operations;
2806
extern void kfree_link(void *);
L
Linus Torvalds 已提交
2807 2808
extern int generic_readlink(struct dentry *, char __user *, int);
extern void generic_fillattr(struct inode *, struct kstat *);
J
J. Bruce Fields 已提交
2809
int vfs_getattr_nosec(struct path *path, struct kstat *stat);
A
Al Viro 已提交
2810
extern int vfs_getattr(struct path *, struct kstat *);
2811
void __inode_add_bytes(struct inode *inode, loff_t bytes);
L
Linus Torvalds 已提交
2812
void inode_add_bytes(struct inode *inode, loff_t bytes);
2813
void __inode_sub_bytes(struct inode *inode, loff_t bytes);
L
Linus Torvalds 已提交
2814 2815 2816
void inode_sub_bytes(struct inode *inode, loff_t bytes);
loff_t inode_get_bytes(struct inode *inode);
void inode_set_bytes(struct inode *inode, loff_t bytes);
2817 2818
const char *simple_get_link(struct dentry *, struct inode *,
			    struct delayed_call *);
A
Al Viro 已提交
2819
extern const struct inode_operations simple_symlink_inode_operations;
L
Linus Torvalds 已提交
2820

2821
extern int iterate_dir(struct file *, struct dir_context *);
L
Linus Torvalds 已提交
2822

2823 2824
extern int vfs_stat(const char __user *, struct kstat *);
extern int vfs_lstat(const char __user *, struct kstat *);
L
Linus Torvalds 已提交
2825
extern int vfs_fstat(unsigned int, struct kstat *);
2826
extern int vfs_fstatat(int , const char __user *, struct kstat *, int);
L
Linus Torvalds 已提交
2827

2828
extern int __generic_block_fiemap(struct inode *inode,
J
Josef Bacik 已提交
2829 2830 2831
				  struct fiemap_extent_info *fieinfo,
				  loff_t start, loff_t len,
				  get_block_t *get_block);
2832 2833 2834
extern int generic_block_fiemap(struct inode *inode,
				struct fiemap_extent_info *fieinfo, u64 start,
				u64 len, get_block_t *get_block);
L
Linus Torvalds 已提交
2835

2836 2837
extern void get_filesystem(struct file_system_type *fs);
extern void put_filesystem(struct file_system_type *fs);
L
Linus Torvalds 已提交
2838 2839
extern struct file_system_type *get_fs_type(const char *name);
extern struct super_block *get_super(struct block_device *);
2840
extern struct super_block *get_super_thawed(struct block_device *);
2841
extern struct super_block *get_active_super(struct block_device *bdev);
L
Linus Torvalds 已提交
2842
extern void drop_super(struct super_block *sb);
A
Al Viro 已提交
2843
extern void iterate_supers(void (*)(struct super_block *, void *), void *);
A
Al Viro 已提交
2844 2845
extern void iterate_supers_type(struct file_system_type *,
			        void (*)(struct super_block *, void *), void *);
L
Linus Torvalds 已提交
2846 2847 2848 2849

extern int dcache_dir_open(struct inode *, struct file *);
extern int dcache_dir_close(struct inode *, struct file *);
extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
2850
extern int dcache_readdir(struct file *, struct dir_context *);
2851
extern int simple_setattr(struct dentry *, struct iattr *);
L
Linus Torvalds 已提交
2852
extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2853
extern int simple_statfs(struct dentry *, struct kstatfs *);
S
Stephen Boyd 已提交
2854
extern int simple_open(struct inode *inode, struct file *file);
L
Linus Torvalds 已提交
2855 2856 2857 2858
extern int simple_link(struct dentry *, struct inode *, struct dentry *);
extern int simple_unlink(struct inode *, struct dentry *);
extern int simple_rmdir(struct inode *, struct dentry *);
extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2859
extern int noop_fsync(struct file *, loff_t, loff_t, int);
L
Linus Torvalds 已提交
2860 2861
extern int simple_empty(struct dentry *);
extern int simple_readpage(struct file *file, struct page *page);
2862 2863 2864 2865 2866 2867
extern int simple_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata);
extern int simple_write_end(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *page, void *fsdata);
2868
extern int always_delete_dentry(const struct dentry *);
A
Al Viro 已提交
2869
extern struct inode *alloc_anon_inode(struct super_block *);
2870
extern int simple_nosetlease(struct file *, long, struct file_lock **, void **);
2871
extern const struct dentry_operations simple_dentry_operations;
L
Linus Torvalds 已提交
2872

A
Al Viro 已提交
2873
extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
L
Linus Torvalds 已提交
2874
extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
2875
extern const struct file_operations simple_dir_operations;
2876
extern const struct inode_operations simple_dir_inode_operations;
2877 2878
extern void make_empty_dir_inode(struct inode *inode);
extern bool is_empty_dir_inode(struct inode *inode);
2879
struct tree_descr { char *name; const struct file_operations *ops; int mode; };
L
Linus Torvalds 已提交
2880
struct dentry *d_alloc_name(struct dentry *, const char *);
2881
extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
2882
extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
L
Linus Torvalds 已提交
2883 2884
extern void simple_release_fs(struct vfsmount **mount, int *count);

2885 2886
extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
			loff_t *ppos, const void *from, size_t available);
2887 2888
extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
		const void __user *from, size_t count);
L
Linus Torvalds 已提交
2889

2890
extern int __generic_file_fsync(struct file *, loff_t, loff_t, int);
2891
extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
A
Al Viro 已提交
2892

2893 2894
extern int generic_check_addressable(unsigned, u64);

2895
#ifdef CONFIG_MIGRATION
2896
extern int buffer_migrate_page(struct address_space *,
2897 2898
				struct page *, struct page *,
				enum migrate_mode);
2899 2900 2901 2902
#else
#define buffer_migrate_page NULL
#endif

N
npiggin@suse.de 已提交
2903 2904
extern int inode_change_ok(const struct inode *, struct iattr *);
extern int inode_newsize_ok(const struct inode *, loff_t offset);
C
Christoph Hellwig 已提交
2905
extern void setattr_copy(struct inode *inode, const struct iattr *attr);
L
Linus Torvalds 已提交
2906

2907
extern int file_update_time(struct file *file);
L
Linus Torvalds 已提交
2908

2909
extern int generic_show_options(struct seq_file *m, struct dentry *root);
2910
extern void save_mount_options(struct super_block *sb, char *options);
2911
extern void replace_mount_options(struct super_block *sb, char *options);
2912

2913 2914
static inline bool io_is_direct(struct file *filp)
{
2915
	return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host);
2916 2917
}

2918 2919 2920 2921 2922 2923 2924 2925 2926 2927
static inline int iocb_flags(struct file *file)
{
	int res = 0;
	if (file->f_flags & O_APPEND)
		res |= IOCB_APPEND;
	if (io_is_direct(file))
		res |= IOCB_DIRECT;
	return res;
}

L
Linus Torvalds 已提交
2928 2929 2930 2931
static inline ino_t parent_ino(struct dentry *dentry)
{
	ino_t res;

N
Nick Piggin 已提交
2932 2933 2934 2935
	/*
	 * Don't strictly need d_lock here? If the parent ino could change
	 * then surely we'd have a deeper race in the caller?
	 */
L
Linus Torvalds 已提交
2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960
	spin_lock(&dentry->d_lock);
	res = dentry->d_parent->d_inode->i_ino;
	spin_unlock(&dentry->d_lock);
	return res;
}

/* Transaction based IO helpers */

/*
 * An argresp is stored in an allocated page and holds the
 * size of the argument or response, along with its content
 */
struct simple_transaction_argresp {
	ssize_t size;
	char data[0];
};

#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))

char *simple_transaction_get(struct file *file, const char __user *buf,
				size_t size);
ssize_t simple_transaction_read(struct file *file, char __user *buf,
				size_t size, loff_t *pos);
int simple_transaction_release(struct inode *inode, struct file *file);

2961
void simple_transaction_set(struct file *file, size_t n);
L
Linus Torvalds 已提交
2962

2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984
/*
 * simple attribute files
 *
 * These attributes behave similar to those in sysfs:
 *
 * Writing to an attribute immediately sets a value, an open file can be
 * written to multiple times.
 *
 * Reading from an attribute creates a buffer from the value that might get
 * read with multiple read calls. When the attribute has been read
 * completely, no further read calls are possible until the file is opened
 * again.
 *
 * All attributes contain a text representation of a numeric value
 * that are accessed with the get() and set() functions.
 */
#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt)		\
static int __fops ## _open(struct inode *inode, struct file *file)	\
{									\
	__simple_attr_check_format(__fmt, 0ull);			\
	return simple_attr_open(inode, file, __get, __set, __fmt);	\
}									\
2985
static const struct file_operations __fops = {				\
2986 2987
	.owner	 = THIS_MODULE,						\
	.open	 = __fops ## _open,					\
2988
	.release = simple_attr_release,					\
2989 2990
	.read	 = simple_attr_read,					\
	.write	 = simple_attr_write,					\
2991
	.llseek	 = generic_file_llseek,					\
2992
}
2993

2994 2995
static inline __printf(1, 2)
void __simple_attr_check_format(const char *fmt, ...)
2996 2997 2998 2999 3000
{
	/* don't do anything, just let the compiler check the arguments; */
}

int simple_attr_open(struct inode *inode, struct file *file,
3001
		     int (*get)(void *, u64 *), int (*set)(void *, u64),
3002
		     const char *fmt);
3003
int simple_attr_release(struct inode *inode, struct file *file);
3004 3005 3006 3007 3008
ssize_t simple_attr_read(struct file *file, char __user *buf,
			 size_t len, loff_t *ppos);
ssize_t simple_attr_write(struct file *file, const char __user *buf,
			  size_t len, loff_t *ppos);

A
Alexey Dobriyan 已提交
3009
struct ctl_table;
3010
int proc_nr_files(struct ctl_table *table, int write,
3011
		  void __user *buffer, size_t *lenp, loff_t *ppos);
3012 3013
int proc_nr_dentry(struct ctl_table *table, int write,
		  void __user *buffer, size_t *lenp, loff_t *ppos);
3014 3015
int proc_nr_inodes(struct ctl_table *table, int write,
		   void __user *buffer, size_t *lenp, loff_t *ppos);
3016
int __init get_filesystem_list(char *buf);
3017

N
Namhyung Kim 已提交
3018
#define __FMODE_EXEC		((__force int) FMODE_EXEC)
3019 3020
#define __FMODE_NONOTIFY	((__force int) FMODE_NONOTIFY)

A
Al Viro 已提交
3021
#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
E
Eric Paris 已提交
3022
#define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
3023
					    (flag & __FMODE_NONOTIFY)))
A
Al Viro 已提交
3024

Y
Yaowei Bai 已提交
3025
static inline bool is_sxid(umode_t mode)
3026 3027 3028 3029
{
	return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
}

M
Miklos Szeredi 已提交
3030 3031 3032 3033 3034 3035 3036 3037
static inline int check_sticky(struct inode *dir, struct inode *inode)
{
	if (!(dir->i_mode & S_ISVTX))
		return 0;

	return __check_sticky(dir, inode);
}

3038 3039
static inline void inode_has_no_xattr(struct inode *inode)
{
A
Al Viro 已提交
3040
	if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC))
3041 3042 3043
		inode->i_flags |= S_NOSEC;
}

A
Al Viro 已提交
3044 3045 3046 3047 3048
static inline bool is_root_inode(struct inode *inode)
{
	return inode == inode->i_sb->s_root->d_inode;
}

3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078
static inline bool dir_emit(struct dir_context *ctx,
			    const char *name, int namelen,
			    u64 ino, unsigned type)
{
	return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0;
}
static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx)
{
	return ctx->actor(ctx, ".", 1, ctx->pos,
			  file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0;
}
static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx)
{
	return ctx->actor(ctx, "..", 2, ctx->pos,
			  parent_ino(file->f_path.dentry), DT_DIR) == 0;
}
static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
{
	if (ctx->pos == 0) {
		if (!dir_emit_dot(file, ctx))
			return false;
		ctx->pos = 1;
	}
	if (ctx->pos == 1) {
		if (!dir_emit_dotdot(file, ctx))
			return false;
		ctx->pos = 2;
	}
	return true;
}
A
Al Viro 已提交
3079 3080
static inline bool dir_relax(struct inode *inode)
{
A
Al Viro 已提交
3081 3082
	inode_unlock(inode);
	inode_lock(inode);
A
Al Viro 已提交
3083 3084
	return !IS_DEADDIR(inode);
}
3085

3086
extern bool path_noexec(const struct path *path);
3087
extern void inode_nohighmem(struct inode *inode);
3088

L
Linus Torvalds 已提交
3089
#endif /* _LINUX_FS_H */