Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
  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
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2000,2002-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#ifndef __XFS_ATTR_H__
#define	__XFS_ATTR_H__

struct xfs_inode;
struct xfs_da_args;
struct xfs_attr_list_context;

/*
 * Large attribute lists are structured around Btrees where all the data
 * elements are in the leaf nodes.  Attribute names are hashed into an int,
 * then that int is used as the index into the Btree.  Since the hashval
 * of an attribute name may not be unique, we may have duplicate keys.
 * The internal links in the Btree are logical block offsets into the file.
 *
 * Small attribute lists use a different format and are packed as tightly
 * as possible so as to fit into the literal area of the inode.
 */

/*
 * The maximum size (into the kernel or returned from the kernel) of an
 * attribute value or the buffer used for an attr_list() call.  Larger
 * sizes will result in an ERANGE return code.
 */
#define	ATTR_MAX_VALUELEN	(64*1024)	/* max length of a value */

/*
 * Kernel-internal version of the attrlist cursor.
 */
struct xfs_attrlist_cursor_kern {
	__u32	hashval;	/* hash value of next entry to add */
	__u32	blkno;		/* block containing entry (suggestion) */
	__u32	offset;		/* offset in list of equal-hashvals */
	__u16	pad1;		/* padding to match user-level */
	__u8	pad2;		/* padding to match user-level */
	__u8	initted;	/* T/F: cursor has been initialized */
};


/*========================================================================
 * Structure used to pass context around among the routines.
 *========================================================================*/


/* void; state communicated via *context */
typedef void (*put_listent_func_t)(struct xfs_attr_list_context *context,
		int flags, unsigned char *name, int namelen, void *value,
		int valuelen);

struct xfs_attr_list_context {
	struct xfs_trans	*tp;
	struct xfs_inode	*dp;		/* inode */
	struct xfs_attrlist_cursor_kern cursor;	/* position in list */
	void			*buffer;	/* output buffer */

	/*
	 * Abort attribute list iteration if non-zero.  Can be used to pass
	 * error values to the xfs_attr_list caller.
	 */
	int			seen_enough;
	bool			allow_incomplete;

	ssize_t			count;		/* num used entries */
	int			dupcnt;		/* count dup hashvals seen */
	int			bufsize;	/* total buffer size */
	int			firstu;		/* first used byte in buffer */
	unsigned int		attr_filter;	/* XFS_ATTR_{ROOT,SECURE} */
	int			resynch;	/* T/F: resynch with cursor */
	put_listent_func_t	put_listent;	/* list output fmt function */
	int			index;		/* index into output buffer */
};


/*
 * ========================================================================
 * Structure used to pass context around among the delayed routines.
 * ========================================================================
 */

/*
 * Below is a state machine diagram for attr remove operations. The  XFS_DAS_*
 * states indicate places where the function would return -EAGAIN, and then
 * immediately resume from after being called by the calling function. States
 * marked as a "subroutine state" indicate that they belong to a subroutine, and
 * so the calling function needs to pass them back to that subroutine to allow
 * it to finish where it left off. But they otherwise do not have a role in the
 * calling function other than just passing through.
 *
 * xfs_attr_remove_iter()
 *              │
 *              v
 *        have attr to remove? ──n──> done
 *              │
 *              y
 *              │
 *              v
 *        are we short form? ──y──> xfs_attr_shortform_remove ──> done
 *              │
 *              n
 *              │
 *              V
 *        are we leaf form? ──y──> xfs_attr_leaf_removename ──> done
 *              │
 *              n
 *              │
 *              V
 *   ┌── need to setup state?
 *   │          │
 *   n          y
 *   │          │
 *   │          v
 *   │ find attr and get state
 *   │ attr has remote blks? ──n─┐
 *   │          │                v
 *   │          │         find and invalidate
 *   │          y         the remote blocks.
 *   │          │         mark attr incomplete
 *   │          ├────────────────┘
 *   └──────────┤
 *              │
 *              v
 *   Have remote blks to remove? ───y─────┐
 *              │        ^          remove the blks
 *              │        │                │
 *              │        │                v
 *              │  XFS_DAS_RMTBLK <─n── done?
 *              │  re-enter with          │
 *              │  one less blk to        y
 *              │      remove             │
 *              │                         V
 *              │                  refill the state
 *              n                         │
 *              │                         v
 *              │                   XFS_DAS_RM_NAME
 *              │                         │
 *              ├─────────────────────────┘
 *              │
 *              v
 *       remove leaf and
 *       update hash with
 *   xfs_attr_node_remove_cleanup
 *              │
 *              v
 *           need to
 *        shrink tree? ─n─┐
 *              │         │
 *              y         │
 *              │         │
 *              v         │
 *          join leaf     │
 *              │         │
 *              v         │
 *      XFS_DAS_RM_SHRINK │
 *              │         │
 *              v         │
 *       do the shrink    │
 *              │         │
 *              v         │
 *          free state <──┘
 *              │
 *              v
 *            done
 *
 *
 * Below is a state machine diagram for attr set operations.
 *
 * It seems the challenge with understanding this system comes from trying to
 * absorb the state machine all at once, when really one should only be looking
 * at it with in the context of a single function. Once a state sensitive
 * function is called, the idea is that it "takes ownership" of the
 * state machine. It isn't concerned with the states that may have belonged to
 * it's calling parent. Only the states relevant to itself or any other
 * subroutines there in. Once a calling function hands off the state machine to
 * a subroutine, it needs to respect the simple rule that it doesn't "own" the
 * state machine anymore, and it's the responsibility of that calling function
 * to propagate the -EAGAIN back up the call stack. Upon reentry, it is
 * committed to re-calling that subroutine until it returns something other than
 * -EAGAIN. Once that subroutine signals completion (by returning anything other
 * than -EAGAIN), the calling function can resume using the state machine.
 *
 *  xfs_attr_set_iter()
 *              │
 *              v
 *   ┌─y─ has an attr fork?
 *   │          |
 *   │          n
 *   │          |
 *   │          V
 *   │       add a fork
 *   │          │
 *   └──────────┤
 *              │
 *              V
 *   ┌─── is shortform?
 *   │          │
 *   │          y
 *   │          │
 *   │          V
 *   │   xfs_attr_set_fmt
 *   │          |
 *   │          V
 *   │ xfs_attr_try_sf_addname
 *   │          │
 *   │          V
 *   │      had enough ──y──> done
 *   │        space?
 *   n          │
 *   │          n
 *   │          │
 *   │          V
 *   │   transform to leaf
 *   │          │
 *   │          V
 *   │   hold the leaf buffer
 *   │          │
 *   │          V
 *   │     return -EAGAIN
 *   │      Re-enter in
 *   │       leaf form
 *   │
 *   └─> release leaf buffer
 *          if needed
 *              │
 *              V
 *   ┌───n── fork has
 *   │      only 1 blk?
 *   │          │
 *   │          y
 *   │          │
 *   │          v
 *   │ xfs_attr_leaf_try_add()
 *   │          │
 *   │          v
 *   │      had enough ──────────────y─────────────┐
 *   │        space?                               │
 *   │          │                                  │
 *   │          n                                  │
 *   │          │                                  │
 *   │          v                                  │
 *   │    return -EAGAIN                           │
 *   │      re-enter in                            │
 *   │        node form                            │
 *   │          │                                  │
 *   └──────────┤                                  │
 *              │                                  │
 *              V                                  │
 * xfs_attr_node_addname_find_attr                 │
 *        determines if this                       │
 *       is create or rename                       │
 *     find space to store attr                    │
 *              │                                  │
 *              v                                  │
 *     xfs_attr_node_addname                       │
 *              │                                  │
 *              v                                  │
 *   fits in a node leaf? ────n─────┐              │
 *              │     ^             v              │
 *              │     │       single leaf node?    │
 *              │     │         │            │     │
 *              y     │         y            n     │
 *              │     │         │            │     │
 *              v     │         v            v     │
 *            update  │    grow the leaf  split if │
 *           hashvals └── return -EAGAIN   needed  │
 *              │         retry leaf add     │     │
 *              │           on reentry       │     │
 *              ├────────────────────────────┘     │
 *              │                                  │
 *              v                                  │
 *         need to alloc                           │
 *   ┌─y── or flip flag?                           │
 *   │          │                                  │
 *   │          n                                  │
 *   │          │                                  │
 *   │          v                                  │
 *   │         done                                │
 *   │                                             │
 *   │                                             │
 *   │         XFS_DAS_FOUND_LBLK <────────────────┘
 *   │                  │
 *   │                  V
 *   │        xfs_attr_leaf_addname()
 *   │                  │
 *   │                  v
 *   │      ┌──first time through?
 *   │      │          │
 *   │      │          y
 *   │      │          │
 *   │      n          v
 *   │      │    if we have rmt blks
 *   │      │    find space for them
 *   │      │          │
 *   │      └──────────┤
 *   │                 │
 *   │                 v
 *   │            still have
 *   │      ┌─n─ blks to alloc? <──┐
 *   │      │          │           │
 *   │      │          y           │
 *   │      │          │           │
 *   │      │          v           │
 *   │      │     alloc one blk    │
 *   │      │     return -EAGAIN ──┘
 *   │      │    re-enter with one
 *   │      │    less blk to alloc
 *   │      │
 *   │      │
 *   │      └───> set the rmt
 *   │               value
 *   │                 │
 *   │                 v
 *   │               was this
 *   │              a rename? ──n─┐
 *   │                 │          │
 *   │                 y          │
 *   │                 │          │
 *   │                 v          │
 *   │           flip incomplete  │
 *   │               flag         │
 *   │                 │          │
 *   │                 v          │
 *   │         XFS_DAS_FLIP_LFLAG │
 *   │                 │          │
 *   │                 v          │
 *   │          need to remove    │
 *   │              old bks? ──n──┤
 *   │                 │          │
 *   │                 y          │
 *   │                 │          │
 *   │                 V          │
 *   │               remove       │
 *   │        ┌───> old blks      │
 *   │        │        │          │
 *   │ XFS_DAS_RM_LBLK │          │
 *   │        ^        │          │
 *   │        │        v          │
 *   │        └──y── more to      │
 *   │              remove?       │
 *   │                 │          │
 *   │                 n          │
 *   │                 │          │
 *   │                 v          │
 *   │          XFS_DAS_RD_LEAF   │
 *   │                 │          │
 *   │                 v          │
 *   │            remove leaf     │
 *   │                 │          │
 *   │                 v          │
 *   │            shrink to sf    │
 *   │             if needed      │
 *   │                 │          │
 *   │                 v          │
 *   │                done <──────┘
 *   │
 *   └──────> XFS_DAS_FOUND_NBLK
 *                     │
 *                     v
 *       ┌─────n──  need to
 *       │        alloc blks?
 *       │             │
 *       │             y
 *       │             │
 *       │             v
 *       │        find space
 *       │             │
 *       │             v
 *       │  ┌─>XFS_DAS_ALLOC_NODE
 *       │  │          │
 *       │  │          v
 *       │  │      alloc blk
 *       │  │          │
 *       │  │          v
 *       │  └──y── need to alloc
 *       │         more blocks?
 *       │             │
 *       │             n
 *       │             │
 *       │             v
 *       │      set the rmt value
 *       │             │
 *       │             v
 *       │          was this
 *       └────────> a rename? ──n─┐
 *                     │          │
 *                     y          │
 *                     │          │
 *                     v          │
 *               flip incomplete  │
 *                   flag         │
 *                     │          │
 *                     v          │
 *             XFS_DAS_FLIP_NFLAG │
 *                     │          │
 *                     v          │
 *                 need to        │
 *               remove blks? ─n──┤
 *                     │          │
 *                     y          │
 *                     │          │
 *                     v          │
 *                   remove       │
 *        ┌────────> old blks     │
 *        │            │          │
 *  XFS_DAS_RM_NBLK    │          │
 *        ^            │          │
 *        │            v          │
 *        └──────y── more to      │
 *                   remove       │
 *                     │          │
 *                     n          │
 *                     │          │
 *                     v          │
 *              XFS_DAS_CLR_FLAG  │
 *                     │          │
 *                     v          │
 *                clear flags     │
 *                     │          │
 *                     ├──────────┘
 *                     │
 *                     v
 *                   done
 */

/*
 * Enum values for xfs_attr_intent.xattri_da_state
 *
 * These values are used by delayed attribute operations to keep track  of where
 * they were before they returned -EAGAIN.  A return code of -EAGAIN signals the
 * calling function to roll the transaction, and then call the subroutine to
 * finish the operation.  The enum is then used by the subroutine to jump back
 * to where it was and resume executing where it left off.
 */
enum xfs_delattr_state {
	XFS_DAS_UNINIT		= 0,	/* No state has been set yet */

	/*
	 * Initial sequence states. The replace setup code relies on the
	 * ADD and REMOVE states for a specific format to be sequential so
	 * that we can transform the initial operation to be performed
	 * according to the xfs_has_larp() state easily.
	 */
	XFS_DAS_SF_ADD,			/* Initial sf add state */
	XFS_DAS_SF_REMOVE,		/* Initial sf replace/remove state */

	XFS_DAS_LEAF_ADD,		/* Initial leaf add state */
	XFS_DAS_LEAF_REMOVE,		/* Initial leaf replace/remove state */

	XFS_DAS_NODE_ADD,		/* Initial node add state */
	XFS_DAS_NODE_REMOVE,		/* Initial node replace/remove state */

	/* Leaf state set/replace/remove sequence */
	XFS_DAS_LEAF_SET_RMT,		/* set a remote xattr from a leaf */
	XFS_DAS_LEAF_ALLOC_RMT,		/* We are allocating remote blocks */
	XFS_DAS_LEAF_REPLACE,		/* Perform replace ops on a leaf */
	XFS_DAS_LEAF_REMOVE_OLD,	/* Start removing old attr from leaf */
	XFS_DAS_LEAF_REMOVE_RMT,	/* A rename is removing remote blocks */
	XFS_DAS_LEAF_REMOVE_ATTR,	/* Remove the old attr from a leaf */

	/* Node state sequence, must match leaf state above */
	XFS_DAS_NODE_SET_RMT,		/* set a remote xattr from a node */
	XFS_DAS_NODE_ALLOC_RMT,		/* We are allocating remote blocks */
	XFS_DAS_NODE_REPLACE,		/* Perform replace ops on a node */
	XFS_DAS_NODE_REMOVE_OLD,	/* Start removing old attr from node */
	XFS_DAS_NODE_REMOVE_RMT,	/* A rename is removing remote blocks */
	XFS_DAS_NODE_REMOVE_ATTR,	/* Remove the old attr from a node */

	XFS_DAS_DONE,			/* finished operation */
};

#define XFS_DAS_STRINGS	\
	{ XFS_DAS_UNINIT,		"XFS_DAS_UNINIT" }, \
	{ XFS_DAS_SF_ADD,		"XFS_DAS_SF_ADD" }, \
	{ XFS_DAS_SF_REMOVE,		"XFS_DAS_SF_REMOVE" }, \
	{ XFS_DAS_LEAF_ADD,		"XFS_DAS_LEAF_ADD" }, \
	{ XFS_DAS_LEAF_REMOVE,		"XFS_DAS_LEAF_REMOVE" }, \
	{ XFS_DAS_NODE_ADD,		"XFS_DAS_NODE_ADD" }, \
	{ XFS_DAS_NODE_REMOVE,		"XFS_DAS_NODE_REMOVE" }, \
	{ XFS_DAS_LEAF_SET_RMT,		"XFS_DAS_LEAF_SET_RMT" }, \
	{ XFS_DAS_LEAF_ALLOC_RMT,	"XFS_DAS_LEAF_ALLOC_RMT" }, \
	{ XFS_DAS_LEAF_REPLACE,		"XFS_DAS_LEAF_REPLACE" }, \
	{ XFS_DAS_LEAF_REMOVE_OLD,	"XFS_DAS_LEAF_REMOVE_OLD" }, \
	{ XFS_DAS_LEAF_REMOVE_RMT,	"XFS_DAS_LEAF_REMOVE_RMT" }, \
	{ XFS_DAS_LEAF_REMOVE_ATTR,	"XFS_DAS_LEAF_REMOVE_ATTR" }, \
	{ XFS_DAS_NODE_SET_RMT,		"XFS_DAS_NODE_SET_RMT" }, \
	{ XFS_DAS_NODE_ALLOC_RMT,	"XFS_DAS_NODE_ALLOC_RMT" },  \
	{ XFS_DAS_NODE_REPLACE,		"XFS_DAS_NODE_REPLACE" },  \
	{ XFS_DAS_NODE_REMOVE_OLD,	"XFS_DAS_NODE_REMOVE_OLD" }, \
	{ XFS_DAS_NODE_REMOVE_RMT,	"XFS_DAS_NODE_REMOVE_RMT" }, \
	{ XFS_DAS_NODE_REMOVE_ATTR,	"XFS_DAS_NODE_REMOVE_ATTR" }, \
	{ XFS_DAS_DONE,			"XFS_DAS_DONE" }

struct xfs_attri_log_nameval;

/*
 * Context used for keeping track of delayed attribute operations
 */
struct xfs_attr_intent {
	/*
	 * used to log this item to an intent containing a list of attrs to
	 * commit later
	 */
	struct list_head		xattri_list;

	/* Used in xfs_attr_node_removename to roll through removing blocks */
	struct xfs_da_state		*xattri_da_state;

	struct xfs_da_args		*xattri_da_args;

	/*
	 * Shared buffer containing the attr name, new name, and value so that
	 * the logging code can share large memory buffers between log items.
	 */
	struct xfs_attri_log_nameval	*xattri_nameval;

	/* Used to keep track of current state of delayed operation */
	enum xfs_delattr_state		xattri_dela_state;

	/*
	 * Attr operation being performed - XFS_ATTRI_OP_FLAGS_*
	 */
	unsigned int			xattri_op_flags;

	/* Used in xfs_attr_rmtval_set_blk to roll through allocating blocks */
	xfs_dablk_t			xattri_lblkno;
	int				xattri_blkcnt;
	struct xfs_bmbt_irec		xattri_map;
};

static inline unsigned int
xfs_attr_intent_op(const struct xfs_attr_intent *attr)
{
	return attr->xattri_op_flags & XFS_ATTRI_OP_FLAGS_TYPE_MASK;
}

/*========================================================================
 * Function prototypes for the kernel.
 *========================================================================*/

/*
 * Overall external interface routines.
 */
int xfs_attr_inactive(struct xfs_inode *dp);
int xfs_attr_list_ilocked(struct xfs_attr_list_context *);
int xfs_attr_list(struct xfs_attr_list_context *);
int xfs_inode_hasattr(struct xfs_inode *ip);
bool xfs_attr_is_leaf(struct xfs_inode *ip);
int xfs_attr_get_ilocked(struct xfs_da_args *args);
int xfs_attr_get(struct xfs_da_args *args);

enum xfs_attr_update {
	XFS_ATTRUPDATE_REMOVE,	/* remove attr */
	XFS_ATTRUPDATE_UPSERT,	/* set value, replace any existing attr */
	XFS_ATTRUPDATE_CREATE,	/* set value, fail if attr already exists */
	XFS_ATTRUPDATE_REPLACE,	/* set value, fail if attr does not exist */
};

int xfs_attr_set(struct xfs_da_args *args, enum xfs_attr_update op, bool rsvd);
int xfs_attr_set_iter(struct xfs_attr_intent *attr);
int xfs_attr_remove_iter(struct xfs_attr_intent *attr);
bool xfs_attr_check_namespace(unsigned int attr_flags);
bool xfs_attr_namecheck(unsigned int attr_flags, const void *name,
		size_t length);
int xfs_attr_calc_size(struct xfs_da_args *args, int *local);
struct xfs_trans_res xfs_attr_set_resv(const struct xfs_da_args *args);

/*
 * Check to see if the attr should be upgraded from non-existent or shortform to
 * single-leaf-block attribute list.
 */
static inline bool
xfs_attr_is_shortform(
	struct xfs_inode    *ip)
{
	return ip->i_af.if_format == XFS_DINODE_FMT_LOCAL ||
	       (ip->i_af.if_format == XFS_DINODE_FMT_EXTENTS &&
		ip->i_af.if_nextents == 0);
}

static inline enum xfs_delattr_state
xfs_attr_init_add_state(struct xfs_da_args *args)
{
	/*
	 * When called from the completion of a attr remove to determine the
	 * next state, the attribute fork may be null. This can occur only occur
	 * on a pure remove, but we grab the next state before we check if a
	 * replace operation is being performed. If we are called from any other
	 * context, i_af is guaranteed to exist. Hence if the attr fork is
	 * null, we were called from a pure remove operation and so we are done.
	 */
	if (!xfs_inode_has_attr_fork(args->dp))
		return XFS_DAS_DONE;

	args->op_flags |= XFS_DA_OP_ADDNAME;
	if (xfs_attr_is_shortform(args->dp))
		return XFS_DAS_SF_ADD;
	if (xfs_attr_is_leaf(args->dp))
		return XFS_DAS_LEAF_ADD;
	return XFS_DAS_NODE_ADD;
}

static inline enum xfs_delattr_state
xfs_attr_init_remove_state(struct xfs_da_args *args)
{
	if (xfs_attr_is_shortform(args->dp))
		return XFS_DAS_SF_REMOVE;
	if (xfs_attr_is_leaf(args->dp))
		return XFS_DAS_LEAF_REMOVE;
	return XFS_DAS_NODE_REMOVE;
}

/*
 * If we are logging the attributes, then we have to start with removal of the
 * old attribute so that there is always consistent state that we can recover
 * from if the system goes down part way through. We always log the new attr
 * value, so even when we remove the attr first we still have the information in
 * the log to finish the replace operation atomically.
 */
static inline enum xfs_delattr_state
xfs_attr_init_replace_state(struct xfs_da_args *args)
{
	args->op_flags |= XFS_DA_OP_ADDNAME | XFS_DA_OP_REPLACE;
	if (args->op_flags & XFS_DA_OP_LOGGED)
		return xfs_attr_init_remove_state(args);
	return xfs_attr_init_add_state(args);
}

xfs_dahash_t xfs_attr_hashname(const uint8_t *name, int namelen);

xfs_dahash_t xfs_attr_hashval(struct xfs_mount *mp, unsigned int attr_flags,
		const uint8_t *name, int namelen, const void *value,
		int valuelen);

/* Set the hash value for any extended attribute from any namespace. */
static inline void xfs_attr_sethash(struct xfs_da_args *args)
{
	args->hashval = xfs_attr_hashval(args->dp->i_mount, args->attr_filter,
					 args->name, args->namelen,
					 args->value, args->valuelen);
}

extern struct kmem_cache *xfs_attr_intent_cache;
int __init xfs_attr_intent_init_cache(void);
void xfs_attr_intent_destroy_cache(void);

int xfs_attr_sf_totsize(struct xfs_inode *dp);
int xfs_attr_add_fork(struct xfs_inode *ip, int size, int rsvd);

#endif	/* __XFS_ATTR_H__ */