summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_inode.h
blob: 4d626f4321bc19096efbf6a957e48fd53b514651 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
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
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#ifndef	__XFS_INODE_H__
#define	__XFS_INODE_H__

#include "xfs_inode_buf.h"
#include "xfs_inode_fork.h"

/*
 * Kernel only inode definitions
 */
struct xfs_dinode;
struct xfs_inode;
struct xfs_buf;
struct xfs_bmbt_irec;
struct xfs_inode_log_item;
struct xfs_mount;
struct xfs_trans;
struct xfs_dquot;

typedef struct xfs_inode {
	/* Inode linking and identification information. */
	struct xfs_mount	*i_mount;	/* fs mount struct ptr */
	struct xfs_dquot	*i_udquot;	/* user dquot */
	struct xfs_dquot	*i_gdquot;	/* group dquot */
	struct xfs_dquot	*i_pdquot;	/* project dquot */

	/* Inode location stuff */
	xfs_ino_t		i_ino;		/* inode number (agno/agino)*/
	struct xfs_imap		i_imap;		/* location for xfs_imap() */

	/* Extent information. */
	struct xfs_ifork	*i_cowfp;	/* copy on write extents */
	struct xfs_ifork	i_df;		/* data fork */
	struct xfs_ifork	i_af;		/* attribute fork */

	/* Transaction and locking information. */
	struct xfs_inode_log_item *i_itemp;	/* logging information */
	mrlock_t		i_lock;		/* inode lock */
	atomic_t		i_pincount;	/* inode pin count */
	struct llist_node	i_gclist;	/* deferred inactivation list */

	/*
	 * Bitsets of inode metadata that have been checked and/or are sick.
	 * Callers must hold i_flags_lock before accessing this field.
	 */
	uint16_t		i_checked;
	uint16_t		i_sick;

	spinlock_t		i_flags_lock;	/* inode i_flags lock */
	/* Miscellaneous state. */
	unsigned long		i_flags;	/* see defined flags below */
	uint64_t		i_delayed_blks;	/* count of delay alloc blks */
	xfs_fsize_t		i_disk_size;	/* number of bytes in file */
	xfs_rfsblock_t		i_nblocks;	/* # of direct & btree blocks */
	prid_t			i_projid;	/* owner's project id */
	xfs_extlen_t		i_extsize;	/* basic/minimum extent size */
	/* cowextsize is only used for v3 inodes, flushiter for v1/2 */
	union {
		xfs_extlen_t	i_cowextsize;	/* basic cow extent size */
		uint16_t	i_flushiter;	/* incremented on flush */
	};
	uint8_t			i_forkoff;	/* attr fork offset >> 3 */
	uint16_t		i_diflags;	/* XFS_DIFLAG_... */
	uint64_t		i_diflags2;	/* XFS_DIFLAG2_... */
	struct timespec64	i_crtime;	/* time created */

	/* unlinked list pointers */
	xfs_agino_t		i_next_unlinked;
	xfs_agino_t		i_prev_unlinked;

	/* VFS inode */
	struct inode		i_vnode;	/* embedded VFS inode */

	/* pending io completions */
	spinlock_t		i_ioend_lock;
	struct work_struct	i_ioend_work;
	struct list_head	i_ioend_list;
} xfs_inode_t;

static inline bool xfs_inode_has_attr_fork(struct xfs_inode *ip)
{
	return ip->i_forkoff > 0;
}

static inline struct xfs_ifork *
xfs_ifork_ptr(
	struct xfs_inode	*ip,
	int			whichfork)
{
	switch (whichfork) {
	case XFS_DATA_FORK:
		return &ip->i_df;
	case XFS_ATTR_FORK:
		if (!xfs_inode_has_attr_fork(ip))
			return NULL;
		return &ip->i_af;
	case XFS_COW_FORK:
		return ip->i_cowfp;
	default:
		ASSERT(0);
		return NULL;
	}
}

static inline unsigned int xfs_inode_fork_boff(struct xfs_inode *ip)
{
	return ip->i_forkoff << 3;
}

static inline unsigned int xfs_inode_data_fork_size(struct xfs_inode *ip)
{
	if (xfs_inode_has_attr_fork(ip))
		return xfs_inode_fork_boff(ip);

	return XFS_LITINO(ip->i_mount);
}

static inline unsigned int xfs_inode_attr_fork_size(struct xfs_inode *ip)
{
	if (xfs_inode_has_attr_fork(ip))
		return XFS_LITINO(ip->i_mount) - xfs_inode_fork_boff(ip);
	return 0;
}

static inline unsigned int
xfs_inode_fork_size(
	struct xfs_inode	*ip,
	int			whichfork)
{
	switch (whichfork) {
	case XFS_DATA_FORK:
		return xfs_inode_data_fork_size(ip);
	case XFS_ATTR_FORK:
		return xfs_inode_attr_fork_size(ip);
	default:
		return 0;
	}
}

/* Convert from vfs inode to xfs inode */
static inline struct xfs_inode *XFS_I(struct inode *inode)
{
	return container_of(inode, struct xfs_inode, i_vnode);
}

/* convert from xfs inode to vfs inode */
static inline struct inode *VFS_I(struct xfs_inode *ip)
{
	return &ip->i_vnode;
}

/*
 * For regular files we only update the on-disk filesize when actually
 * writing data back to disk.  Until then only the copy in the VFS inode
 * is uptodate.
 */
static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
{
	if (S_ISREG(VFS_I(ip)->i_mode))
		return i_size_read(VFS_I(ip));
	return ip->i_disk_size;
}

/*
 * If this I/O goes past the on-disk inode size update it unless it would
 * be past the current in-core inode size.
 */
static inline xfs_fsize_t
xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
{
	xfs_fsize_t i_size = i_size_read(VFS_I(ip));

	if (new_size > i_size || new_size < 0)
		new_size = i_size;
	return new_size > ip->i_disk_size ? new_size : 0;
}

/*
 * i_flags helper functions
 */
static inline void
__xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
{
	ip->i_flags |= flags;
}

static inline void
xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
{
	spin_lock(&ip->i_flags_lock);
	__xfs_iflags_set(ip, flags);
	spin_unlock(&ip->i_flags_lock);
}

static inline void
xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
{
	spin_lock(&ip->i_flags_lock);
	ip->i_flags &= ~flags;
	spin_unlock(&ip->i_flags_lock);
}

static inline int
__xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
{
	return (ip->i_flags & flags);
}

static inline int
xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
{
	int ret;
	spin_lock(&ip->i_flags_lock);
	ret = __xfs_iflags_test(ip, flags);
	spin_unlock(&ip->i_flags_lock);
	return ret;
}

static inline int
xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
{
	int ret;

	spin_lock(&ip->i_flags_lock);
	ret = ip->i_flags & flags;
	if (ret)
		ip->i_flags &= ~flags;
	spin_unlock(&ip->i_flags_lock);
	return ret;
}

static inline int
xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
{
	int ret;

	spin_lock(&ip->i_flags_lock);
	ret = ip->i_flags & flags;
	if (!ret)
		ip->i_flags |= flags;
	spin_unlock(&ip->i_flags_lock);
	return ret;
}

static inline prid_t
xfs_get_initial_prid(struct xfs_inode *dp)
{
	if (dp->i_diflags & XFS_DIFLAG_PROJINHERIT)
		return dp->i_projid;

	return XFS_PROJID_DEFAULT;
}

static inline bool xfs_is_reflink_inode(struct xfs_inode *ip)
{
	return ip->i_diflags2 & XFS_DIFLAG2_REFLINK;
}

static inline bool xfs_is_metadata_inode(struct xfs_inode *ip)
{
	struct xfs_mount	*mp = ip->i_mount;

	return ip == mp->m_rbmip || ip == mp->m_rsumip ||
		xfs_is_quota_inode(&mp->m_sb, ip->i_ino);
}

/*
 * Check if an inode has any data in the COW fork.  This might be often false
 * even for inodes with the reflink flag when there is no pending COW operation.
 */
static inline bool xfs_inode_has_cow_data(struct xfs_inode *ip)
{
	return ip->i_cowfp && ip->i_cowfp->if_bytes;
}

static inline bool xfs_inode_has_bigtime(struct xfs_inode *ip)
{
	return ip->i_diflags2 & XFS_DIFLAG2_BIGTIME;
}

static inline bool xfs_inode_has_large_extent_counts(struct xfs_inode *ip)
{
	return ip->i_diflags2 & XFS_DIFLAG2_NREXT64;
}

/*
 * Return the buftarg used for data allocations on a given inode.
 */
#define xfs_inode_buftarg(ip) \
	(XFS_IS_REALTIME_INODE(ip) ? \
		(ip)->i_mount->m_rtdev_targp : (ip)->i_mount->m_ddev_targp)

/*
 * In-core inode flags.
 */
#define XFS_IRECLAIM		(1 << 0) /* started reclaiming this inode */
#define XFS_ISTALE		(1 << 1) /* inode has been staled */
#define XFS_IRECLAIMABLE	(1 << 2) /* inode can be reclaimed */
#define XFS_INEW		(1 << 3) /* inode has just been allocated */
#define XFS_IPRESERVE_DM_FIELDS	(1 << 4) /* has legacy DMAPI fields set */
#define XFS_ITRUNCATED		(1 << 5) /* truncated down so flush-on-close */
#define XFS_IDIRTY_RELEASE	(1 << 6) /* dirty release already seen */
#define XFS_IFLUSHING		(1 << 7) /* inode is being flushed */
#define __XFS_IPINNED_BIT	8	 /* wakeup key for zero pin count */
#define XFS_IPINNED		(1 << __XFS_IPINNED_BIT)
#define XFS_IEOFBLOCKS		(1 << 9) /* has the preallocblocks tag set */
#define XFS_NEED_INACTIVE	(1 << 10) /* see XFS_INACTIVATING below */
/*
 * If this unlinked inode is in the middle of recovery, don't let drop_inode
 * truncate and free the inode.  This can happen if we iget the inode during
 * log recovery to replay a bmap operation on the inode.
 */
#define XFS_IRECOVERY		(1 << 11)
#define XFS_ICOWBLOCKS		(1 << 12)/* has the cowblocks tag set */

/*
 * If we need to update on-disk metadata before this IRECLAIMABLE inode can be
 * freed, then NEED_INACTIVE will be set.  Once we start the updates, the
 * INACTIVATING bit will be set to keep iget away from this inode.  After the
 * inactivation completes, both flags will be cleared and the inode is a
 * plain old IRECLAIMABLE inode.
 */
#define XFS_INACTIVATING	(1 << 13)

/* All inode state flags related to inode reclaim. */
#define XFS_ALL_IRECLAIM_FLAGS	(XFS_IRECLAIMABLE | \
				 XFS_IRECLAIM | \
				 XFS_NEED_INACTIVE | \
				 XFS_INACTIVATING)

/*
 * Per-lifetime flags need to be reset when re-using a reclaimable inode during
 * inode lookup. This prevents unintended behaviour on the new inode from
 * ocurring.
 */
#define XFS_IRECLAIM_RESET_FLAGS	\
	(XFS_IRECLAIMABLE | XFS_IRECLAIM | \
	 XFS_IDIRTY_RELEASE | XFS_ITRUNCATED | XFS_NEED_INACTIVE | \
	 XFS_INACTIVATING)

/*
 * Flags for inode locking.
 * Bit ranges:	1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
 *		1<<16 - 1<<32-1 -- lockdep annotation (integers)
 */
#define	XFS_IOLOCK_EXCL		(1u << 0)
#define	XFS_IOLOCK_SHARED	(1u << 1)
#define	XFS_ILOCK_EXCL		(1u << 2)
#define	XFS_ILOCK_SHARED	(1u << 3)
#define	XFS_MMAPLOCK_EXCL	(1u << 4)
#define	XFS_MMAPLOCK_SHARED	(1u << 5)

#define XFS_LOCK_MASK		(XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
				| XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
				| XFS_MMAPLOCK_EXCL | XFS_MMAPLOCK_SHARED)

#define XFS_LOCK_FLAGS \
	{ XFS_IOLOCK_EXCL,	"IOLOCK_EXCL" }, \
	{ XFS_IOLOCK_SHARED,	"IOLOCK_SHARED" }, \
	{ XFS_ILOCK_EXCL,	"ILOCK_EXCL" }, \
	{ XFS_ILOCK_SHARED,	"ILOCK_SHARED" }, \
	{ XFS_MMAPLOCK_EXCL,	"MMAPLOCK_EXCL" }, \
	{ XFS_MMAPLOCK_SHARED,	"MMAPLOCK_SHARED" }


/*
 * Flags for lockdep annotations.
 *
 * XFS_LOCK_PARENT - for directory operations that require locking a
 * parent directory inode and a child entry inode. IOLOCK requires nesting,
 * MMAPLOCK does not support this class, ILOCK requires a single subclass
 * to differentiate parent from child.
 *
 * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
 * inodes do not participate in the normal lock order, and thus have their
 * own subclasses.
 *
 * XFS_LOCK_INUMORDER - for locking several inodes at the some time
 * with xfs_lock_inodes().  This flag is used as the starting subclass
 * and each subsequent lock acquired will increment the subclass by one.
 * However, MAX_LOCKDEP_SUBCLASSES == 8, which means we are greatly
 * limited to the subclasses we can represent via nesting. We need at least
 * 5 inodes nest depth for the ILOCK through rename, and we also have to support
 * XFS_ILOCK_PARENT, which gives 6 subclasses. Then we have XFS_ILOCK_RTBITMAP
 * and XFS_ILOCK_RTSUM, which are another 2 unique subclasses, so that's all
 * 8 subclasses supported by lockdep.
 *
 * This also means we have to number the sub-classes in the lowest bits of
 * the mask we keep, and we have to ensure we never exceed 3 bits of lockdep
 * mask and we can't use bit-masking to build the subclasses. What a mess.
 *
 * Bit layout:
 *
 * Bit		Lock Region
 * 16-19	XFS_IOLOCK_SHIFT dependencies
 * 20-23	XFS_MMAPLOCK_SHIFT dependencies
 * 24-31	XFS_ILOCK_SHIFT dependencies
 *
 * IOLOCK values
 *
 * 0-3		subclass value
 * 4-7		unused
 *
 * MMAPLOCK values
 *
 * 0-3		subclass value
 * 4-7		unused
 *
 * ILOCK values
 * 0-4		subclass values
 * 5		PARENT subclass (not nestable)
 * 6		RTBITMAP subclass (not nestable)
 * 7		RTSUM subclass (not nestable)
 * 
 */
#define XFS_IOLOCK_SHIFT		16
#define XFS_IOLOCK_MAX_SUBCLASS		3
#define XFS_IOLOCK_DEP_MASK		0x000f0000u

#define XFS_MMAPLOCK_SHIFT		20
#define XFS_MMAPLOCK_NUMORDER		0
#define XFS_MMAPLOCK_MAX_SUBCLASS	3
#define XFS_MMAPLOCK_DEP_MASK		0x00f00000u

#define XFS_ILOCK_SHIFT			24
#define XFS_ILOCK_PARENT_VAL		5u
#define XFS_ILOCK_MAX_SUBCLASS		(XFS_ILOCK_PARENT_VAL - 1)
#define XFS_ILOCK_RTBITMAP_VAL		6u
#define XFS_ILOCK_RTSUM_VAL		7u
#define XFS_ILOCK_DEP_MASK		0xff000000u
#define	XFS_ILOCK_PARENT		(XFS_ILOCK_PARENT_VAL << XFS_ILOCK_SHIFT)
#define	XFS_ILOCK_RTBITMAP		(XFS_ILOCK_RTBITMAP_VAL << XFS_ILOCK_SHIFT)
#define	XFS_ILOCK_RTSUM			(XFS_ILOCK_RTSUM_VAL << XFS_ILOCK_SHIFT)

#define XFS_LOCK_SUBCLASS_MASK	(XFS_IOLOCK_DEP_MASK | \
				 XFS_MMAPLOCK_DEP_MASK | \
				 XFS_ILOCK_DEP_MASK)

#define XFS_IOLOCK_DEP(flags)	(((flags) & XFS_IOLOCK_DEP_MASK) \
					>> XFS_IOLOCK_SHIFT)
#define XFS_MMAPLOCK_DEP(flags)	(((flags) & XFS_MMAPLOCK_DEP_MASK) \
					>> XFS_MMAPLOCK_SHIFT)
#define XFS_ILOCK_DEP(flags)	(((flags) & XFS_ILOCK_DEP_MASK) \
					>> XFS_ILOCK_SHIFT)

/*
 * Layouts are broken in the BREAK_WRITE case to ensure that
 * layout-holders do not collide with local writes. Additionally,
 * layouts are broken in the BREAK_UNMAP case to make sure the
 * layout-holder has a consistent view of the file's extent map. While
 * BREAK_WRITE breaks can be satisfied by recalling FL_LAYOUT leases,
 * BREAK_UNMAP breaks additionally require waiting for busy dax-pages to
 * go idle.
 */
enum layout_break_reason {
        BREAK_WRITE,
        BREAK_UNMAP,
};

/*
 * For multiple groups support: if S_ISGID bit is set in the parent
 * directory, group of new file is set to that of the parent, and
 * new subdirectory gets S_ISGID bit from parent.
 */
#define XFS_INHERIT_GID(pip)	\
	(xfs_has_grpid((pip)->i_mount) || (VFS_I(pip)->i_mode & S_ISGID))

int		xfs_release(struct xfs_inode *ip);
void		xfs_inactive(struct xfs_inode *ip);
int		xfs_lookup(struct xfs_inode *dp, const struct xfs_name *name,
			   struct xfs_inode **ipp, struct xfs_name *ci_name);
int		xfs_create(struct user_namespace *mnt_userns,
			   struct xfs_inode *dp, struct xfs_name *name,
			   umode_t mode, dev_t rdev, bool need_xattr,
			   struct xfs_inode **ipp);
int		xfs_create_tmpfile(struct user_namespace *mnt_userns,
			   struct xfs_inode *dp, umode_t mode,
			   struct xfs_inode **ipp);
int		xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
			   struct xfs_inode *ip);
int		xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
			 struct xfs_name *target_name);
int		xfs_rename(struct user_namespace *mnt_userns,
			   struct xfs_inode *src_dp, struct xfs_name *src_name,
			   struct xfs_inode *src_ip, struct xfs_inode *target_dp,
			   struct xfs_name *target_name,
			   struct xfs_inode *target_ip, unsigned int flags);

void		xfs_ilock(xfs_inode_t *, uint);
int		xfs_ilock_nowait(xfs_inode_t *, uint);
void		xfs_iunlock(xfs_inode_t *, uint);
void		xfs_ilock_demote(xfs_inode_t *, uint);
bool		xfs_isilocked(struct xfs_inode *, uint);
uint		xfs_ilock_data_map_shared(struct xfs_inode *);
uint		xfs_ilock_attr_map_shared(struct xfs_inode *);

uint		xfs_ip2xflags(struct xfs_inode *);
int		xfs_ifree(struct xfs_trans *, struct xfs_inode *);
int		xfs_itruncate_extents_flags(struct xfs_trans **,
				struct xfs_inode *, int, xfs_fsize_t, int);
void		xfs_iext_realloc(xfs_inode_t *, int, int);

int		xfs_log_force_inode(struct xfs_inode *ip);
void		xfs_iunpin_wait(xfs_inode_t *);
#define xfs_ipincount(ip)	((unsigned int) atomic_read(&ip->i_pincount))

int		xfs_iflush_cluster(struct xfs_buf *);
void		xfs_lock_two_inodes(struct xfs_inode *ip0, uint ip0_mode,
				struct xfs_inode *ip1, uint ip1_mode);

xfs_extlen_t	xfs_get_extsz_hint(struct xfs_inode *ip);
xfs_extlen_t	xfs_get_cowextsz_hint(struct xfs_inode *ip);

int xfs_init_new_inode(struct user_namespace *mnt_userns, struct xfs_trans *tp,
		struct xfs_inode *pip, xfs_ino_t ino, umode_t mode,
		xfs_nlink_t nlink, dev_t rdev, prid_t prid, bool init_xattrs,
		struct xfs_inode **ipp);

static inline int
xfs_itruncate_extents(
	struct xfs_trans	**tpp,
	struct xfs_inode	*ip,
	int			whichfork,
	xfs_fsize_t		new_size)
{
	return xfs_itruncate_extents_flags(tpp, ip, whichfork, new_size, 0);
}

/* from xfs_file.c */
int	xfs_break_layouts(struct inode *inode, uint *iolock,
		enum layout_break_reason reason);

/* from xfs_iops.c */
extern void xfs_setup_inode(struct xfs_inode *ip);
extern void xfs_setup_iops(struct xfs_inode *ip);
extern void xfs_diflags_to_iflags(struct xfs_inode *ip, bool init);

/*
 * When setting up a newly allocated inode, we need to call
 * xfs_finish_inode_setup() once the inode is fully instantiated at
 * the VFS level to prevent the rest of the world seeing the inode
 * before we've completed instantiation. Otherwise we can do it
 * the moment the inode lookup is complete.
 */
static inline void xfs_finish_inode_setup(struct xfs_inode *ip)
{
	xfs_iflags_clear(ip, XFS_INEW);
	barrier();
	unlock_new_inode(VFS_I(ip));
}

static inline void xfs_setup_existing_inode(struct xfs_inode *ip)
{
	xfs_setup_inode(ip);
	xfs_setup_iops(ip);
	xfs_finish_inode_setup(ip);
}

void xfs_irele(struct xfs_inode *ip);

extern struct kmem_cache	*xfs_inode_cache;

/* The default CoW extent size hint. */
#define XFS_DEFAULT_COWEXTSZ_HINT 32

bool xfs_inode_needs_inactive(struct xfs_inode *ip);

void xfs_end_io(struct work_struct *work);

int xfs_ilock2_io_mmap(struct xfs_inode *ip1, struct xfs_inode *ip2);
void xfs_iunlock2_io_mmap(struct xfs_inode *ip1, struct xfs_inode *ip2);

#endif	/* __XFS_INODE_H__ */