summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_attr_item.c
blob: 5077a7ad56460f78cffb578f3bddc381e2da8cd3 (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
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
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
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
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
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
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2022 Oracle.  All Rights Reserved.
 * Author: Allison Henderson <allison.henderson@oracle.com>
 */

#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_trans_resv.h"
#include "xfs_shared.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_bmap_btree.h"
#include "xfs_trans_priv.h"
#include "xfs_log.h"
#include "xfs_inode.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_attr.h"
#include "xfs_attr_item.h"
#include "xfs_trace.h"
#include "xfs_trans_space.h"
#include "xfs_errortag.h"
#include "xfs_error.h"
#include "xfs_log_priv.h"
#include "xfs_log_recover.h"

struct kmem_cache		*xfs_attri_cache;
struct kmem_cache		*xfs_attrd_cache;

static const struct xfs_item_ops xfs_attri_item_ops;
static const struct xfs_item_ops xfs_attrd_item_ops;
static struct xfs_attrd_log_item *xfs_trans_get_attrd(struct xfs_trans *tp,
					struct xfs_attri_log_item *attrip);

static inline struct xfs_attri_log_item *ATTRI_ITEM(struct xfs_log_item *lip)
{
	return container_of(lip, struct xfs_attri_log_item, attri_item);
}

/*
 * Shared xattr name/value buffers for logged extended attribute operations
 *
 * When logging updates to extended attributes, we can create quite a few
 * attribute log intent items for a single xattr update.  To avoid cycling the
 * memory allocator and memcpy overhead, the name (and value, for setxattr)
 * are kept in a refcounted object that is shared across all related log items
 * and the upper-level deferred work state structure.  The shared buffer has
 * a control structure, followed by the name, and then the value.
 */

static inline struct xfs_attri_log_nameval *
xfs_attri_log_nameval_get(
	struct xfs_attri_log_nameval	*nv)
{
	if (!refcount_inc_not_zero(&nv->refcount))
		return NULL;
	return nv;
}

static inline void
xfs_attri_log_nameval_put(
	struct xfs_attri_log_nameval	*nv)
{
	if (!nv)
		return;
	if (refcount_dec_and_test(&nv->refcount))
		kvfree(nv);
}

static inline struct xfs_attri_log_nameval *
xfs_attri_log_nameval_alloc(
	const void			*name,
	unsigned int			name_len,
	const void			*value,
	unsigned int			value_len)
{
	struct xfs_attri_log_nameval	*nv;

	/*
	 * This could be over 64kB in length, so we have to use kvmalloc() for
	 * this. But kvmalloc() utterly sucks, so we use our own version.
	 */
	nv = xlog_kvmalloc(sizeof(struct xfs_attri_log_nameval) +
					name_len + value_len);
	if (!nv)
		return nv;

	nv->name.i_addr = nv + 1;
	nv->name.i_len = name_len;
	nv->name.i_type = XLOG_REG_TYPE_ATTR_NAME;
	memcpy(nv->name.i_addr, name, name_len);

	if (value_len) {
		nv->value.i_addr = nv->name.i_addr + name_len;
		nv->value.i_len = value_len;
		memcpy(nv->value.i_addr, value, value_len);
	} else {
		nv->value.i_addr = NULL;
		nv->value.i_len = 0;
	}
	nv->value.i_type = XLOG_REG_TYPE_ATTR_VALUE;

	refcount_set(&nv->refcount, 1);
	return nv;
}

STATIC void
xfs_attri_item_free(
	struct xfs_attri_log_item	*attrip)
{
	kmem_free(attrip->attri_item.li_lv_shadow);
	xfs_attri_log_nameval_put(attrip->attri_nameval);
	kmem_cache_free(xfs_attri_cache, attrip);
}

/*
 * Freeing the attrip requires that we remove it from the AIL if it has already
 * been placed there. However, the ATTRI may not yet have been placed in the
 * AIL when called by xfs_attri_release() from ATTRD processing due to the
 * ordering of committed vs unpin operations in bulk insert operations. Hence
 * the reference count to ensure only the last caller frees the ATTRI.
 */
STATIC void
xfs_attri_release(
	struct xfs_attri_log_item	*attrip)
{
	ASSERT(atomic_read(&attrip->attri_refcount) > 0);
	if (!atomic_dec_and_test(&attrip->attri_refcount))
		return;

	xfs_trans_ail_delete(&attrip->attri_item, 0);
	xfs_attri_item_free(attrip);
}

STATIC void
xfs_attri_item_size(
	struct xfs_log_item		*lip,
	int				*nvecs,
	int				*nbytes)
{
	struct xfs_attri_log_item       *attrip = ATTRI_ITEM(lip);
	struct xfs_attri_log_nameval	*nv = attrip->attri_nameval;

	*nvecs += 2;
	*nbytes += sizeof(struct xfs_attri_log_format) +
			xlog_calc_iovec_len(nv->name.i_len);

	if (!nv->value.i_len)
		return;

	*nvecs += 1;
	*nbytes += xlog_calc_iovec_len(nv->value.i_len);
}

/*
 * This is called to fill in the log iovecs for the given attri log
 * item. We use  1 iovec for the attri_format_item, 1 for the name, and
 * another for the value if it is present
 */
STATIC void
xfs_attri_item_format(
	struct xfs_log_item		*lip,
	struct xfs_log_vec		*lv)
{
	struct xfs_attri_log_item	*attrip = ATTRI_ITEM(lip);
	struct xfs_log_iovec		*vecp = NULL;
	struct xfs_attri_log_nameval	*nv = attrip->attri_nameval;

	attrip->attri_format.alfi_type = XFS_LI_ATTRI;
	attrip->attri_format.alfi_size = 1;

	/*
	 * This size accounting must be done before copying the attrip into the
	 * iovec.  If we do it after, the wrong size will be recorded to the log
	 * and we trip across assertion checks for bad region sizes later during
	 * the log recovery.
	 */

	ASSERT(nv->name.i_len > 0);
	attrip->attri_format.alfi_size++;

	if (nv->value.i_len > 0)
		attrip->attri_format.alfi_size++;

	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTRI_FORMAT,
			&attrip->attri_format,
			sizeof(struct xfs_attri_log_format));
	xlog_copy_from_iovec(lv, &vecp, &nv->name);
	if (nv->value.i_len > 0)
		xlog_copy_from_iovec(lv, &vecp, &nv->value);
}

/*
 * The unpin operation is the last place an ATTRI is manipulated in the log. It
 * is either inserted in the AIL or aborted in the event of a log I/O error. In
 * either case, the ATTRI transaction has been successfully committed to make
 * it this far. Therefore, we expect whoever committed the ATTRI to either
 * construct and commit the ATTRD or drop the ATTRD's reference in the event of
 * error. Simply drop the log's ATTRI reference now that the log is done with
 * it.
 */
STATIC void
xfs_attri_item_unpin(
	struct xfs_log_item	*lip,
	int			remove)
{
	xfs_attri_release(ATTRI_ITEM(lip));
}


STATIC void
xfs_attri_item_release(
	struct xfs_log_item	*lip)
{
	xfs_attri_release(ATTRI_ITEM(lip));
}

/*
 * Allocate and initialize an attri item.  Caller may allocate an additional
 * trailing buffer for name and value
 */
STATIC struct xfs_attri_log_item *
xfs_attri_init(
	struct xfs_mount		*mp,
	struct xfs_attri_log_nameval	*nv)
{
	struct xfs_attri_log_item	*attrip;

	attrip = kmem_cache_zalloc(xfs_attri_cache, GFP_NOFS | __GFP_NOFAIL);

	/*
	 * Grab an extra reference to the name/value buffer for this log item.
	 * The caller retains its own reference!
	 */
	attrip->attri_nameval = xfs_attri_log_nameval_get(nv);
	ASSERT(attrip->attri_nameval);

	xfs_log_item_init(mp, &attrip->attri_item, XFS_LI_ATTRI,
			  &xfs_attri_item_ops);
	attrip->attri_format.alfi_id = (uintptr_t)(void *)attrip;
	atomic_set(&attrip->attri_refcount, 2);

	return attrip;
}

/*
 * Copy an attr format buffer from the given buf, and into the destination attr
 * format structure.
 */
STATIC int
xfs_attri_copy_format(
	struct xfs_log_iovec		*buf,
	struct xfs_attri_log_format	*dst_attr_fmt)
{
	struct xfs_attri_log_format	*src_attr_fmt = buf->i_addr;
	size_t				len;

	len = sizeof(struct xfs_attri_log_format);
	if (buf->i_len != len) {
		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, NULL);
		return -EFSCORRUPTED;
	}

	memcpy((char *)dst_attr_fmt, (char *)src_attr_fmt, len);
	return 0;
}

static inline struct xfs_attrd_log_item *ATTRD_ITEM(struct xfs_log_item *lip)
{
	return container_of(lip, struct xfs_attrd_log_item, attrd_item);
}

STATIC void
xfs_attrd_item_free(struct xfs_attrd_log_item *attrdp)
{
	kmem_free(attrdp->attrd_item.li_lv_shadow);
	kmem_cache_free(xfs_attrd_cache, attrdp);
}

STATIC void
xfs_attrd_item_size(
	struct xfs_log_item		*lip,
	int				*nvecs,
	int				*nbytes)
{
	*nvecs += 1;
	*nbytes += sizeof(struct xfs_attrd_log_format);
}

/*
 * This is called to fill in the log iovecs for the given attrd log item. We use
 * only 1 iovec for the attrd_format, and we point that at the attr_log_format
 * structure embedded in the attrd item.
 */
STATIC void
xfs_attrd_item_format(
	struct xfs_log_item	*lip,
	struct xfs_log_vec	*lv)
{
	struct xfs_attrd_log_item	*attrdp = ATTRD_ITEM(lip);
	struct xfs_log_iovec		*vecp = NULL;

	attrdp->attrd_format.alfd_type = XFS_LI_ATTRD;
	attrdp->attrd_format.alfd_size = 1;

	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTRD_FORMAT,
			&attrdp->attrd_format,
			sizeof(struct xfs_attrd_log_format));
}

/*
 * The ATTRD is either committed or aborted if the transaction is canceled. If
 * the transaction is canceled, drop our reference to the ATTRI and free the
 * ATTRD.
 */
STATIC void
xfs_attrd_item_release(
	struct xfs_log_item		*lip)
{
	struct xfs_attrd_log_item	*attrdp = ATTRD_ITEM(lip);

	xfs_attri_release(attrdp->attrd_attrip);
	xfs_attrd_item_free(attrdp);
}

static struct xfs_log_item *
xfs_attrd_item_intent(
	struct xfs_log_item	*lip)
{
	return &ATTRD_ITEM(lip)->attrd_attrip->attri_item;
}

/*
 * Performs one step of an attribute update intent and marks the attrd item
 * dirty..  An attr operation may be a set or a remove.  Note that the
 * transaction is marked dirty regardless of whether the operation succeeds or
 * fails to support the ATTRI/ATTRD lifecycle rules.
 */
STATIC int
xfs_xattri_finish_update(
	struct xfs_attr_intent		*attr,
	struct xfs_attrd_log_item	*attrdp)
{
	struct xfs_da_args		*args = attr->xattri_da_args;
	int				error;

	if (XFS_TEST_ERROR(false, args->dp->i_mount, XFS_ERRTAG_LARP)) {
		error = -EIO;
		goto out;
	}

	error = xfs_attr_set_iter(attr);
	if (!error && attr->xattri_dela_state != XFS_DAS_DONE)
		error = -EAGAIN;
out:
	/*
	 * Mark the transaction dirty, even on error. This ensures the
	 * transaction is aborted, which:
	 *
	 * 1.) releases the ATTRI and frees the ATTRD
	 * 2.) shuts down the filesystem
	 */
	args->trans->t_flags |= XFS_TRANS_DIRTY | XFS_TRANS_HAS_INTENT_DONE;

	/*
	 * attr intent/done items are null when logged attributes are disabled
	 */
	if (attrdp)
		set_bit(XFS_LI_DIRTY, &attrdp->attrd_item.li_flags);

	return error;
}

/* Log an attr to the intent item. */
STATIC void
xfs_attr_log_item(
	struct xfs_trans		*tp,
	struct xfs_attri_log_item	*attrip,
	const struct xfs_attr_intent	*attr)
{
	struct xfs_attri_log_format	*attrp;

	tp->t_flags |= XFS_TRANS_DIRTY;
	set_bit(XFS_LI_DIRTY, &attrip->attri_item.li_flags);

	/*
	 * At this point the xfs_attr_intent has been constructed, and we've
	 * created the log intent. Fill in the attri log item and log format
	 * structure with fields from this xfs_attr_intent
	 */
	attrp = &attrip->attri_format;
	attrp->alfi_ino = attr->xattri_da_args->dp->i_ino;
	ASSERT(!(attr->xattri_op_flags & ~XFS_ATTRI_OP_FLAGS_TYPE_MASK));
	attrp->alfi_op_flags = attr->xattri_op_flags;
	attrp->alfi_value_len = attr->xattri_nameval->value.i_len;
	attrp->alfi_name_len = attr->xattri_nameval->name.i_len;
	ASSERT(!(attr->xattri_da_args->attr_filter & ~XFS_ATTRI_FILTER_MASK));
	attrp->alfi_attr_filter = attr->xattri_da_args->attr_filter;
}

/* Get an ATTRI. */
static struct xfs_log_item *
xfs_attr_create_intent(
	struct xfs_trans		*tp,
	struct list_head		*items,
	unsigned int			count,
	bool				sort)
{
	struct xfs_mount		*mp = tp->t_mountp;
	struct xfs_attri_log_item	*attrip;
	struct xfs_attr_intent		*attr;
	struct xfs_da_args		*args;

	ASSERT(count == 1);

	/*
	 * Each attr item only performs one attribute operation at a time, so
	 * this is a list of one
	 */
	attr = list_first_entry_or_null(items, struct xfs_attr_intent,
			xattri_list);
	args = attr->xattri_da_args;

	if (!(args->op_flags & XFS_DA_OP_LOGGED))
		return NULL;

	/*
	 * Create a buffer to store the attribute name and value.  This buffer
	 * will be shared between the higher level deferred xattr work state
	 * and the lower level xattr log items.
	 */
	if (!attr->xattri_nameval) {
		/*
		 * Transfer our reference to the name/value buffer to the
		 * deferred work state structure.
		 */
		attr->xattri_nameval = xfs_attri_log_nameval_alloc(args->name,
				args->namelen, args->value, args->valuelen);
	}
	if (!attr->xattri_nameval)
		return ERR_PTR(-ENOMEM);

	attrip = xfs_attri_init(mp, attr->xattri_nameval);
	xfs_trans_add_item(tp, &attrip->attri_item);
	xfs_attr_log_item(tp, attrip, attr);

	return &attrip->attri_item;
}

static inline void
xfs_attr_free_item(
	struct xfs_attr_intent		*attr)
{
	if (attr->xattri_da_state)
		xfs_da_state_free(attr->xattri_da_state);
	xfs_attri_log_nameval_put(attr->xattri_nameval);
	if (attr->xattri_da_args->op_flags & XFS_DA_OP_RECOVERY)
		kmem_free(attr);
	else
		kmem_cache_free(xfs_attr_intent_cache, attr);
}

/* Process an attr. */
STATIC int
xfs_attr_finish_item(
	struct xfs_trans		*tp,
	struct xfs_log_item		*done,
	struct list_head		*item,
	struct xfs_btree_cur		**state)
{
	struct xfs_attr_intent		*attr;
	struct xfs_attrd_log_item	*done_item = NULL;
	int				error;

	attr = container_of(item, struct xfs_attr_intent, xattri_list);
	if (done)
		done_item = ATTRD_ITEM(done);

	/*
	 * Always reset trans after EAGAIN cycle
	 * since the transaction is new
	 */
	attr->xattri_da_args->trans = tp;

	error = xfs_xattri_finish_update(attr, done_item);
	if (error != -EAGAIN)
		xfs_attr_free_item(attr);

	return error;
}

/* Abort all pending ATTRs. */
STATIC void
xfs_attr_abort_intent(
	struct xfs_log_item		*intent)
{
	xfs_attri_release(ATTRI_ITEM(intent));
}

/* Cancel an attr */
STATIC void
xfs_attr_cancel_item(
	struct list_head		*item)
{
	struct xfs_attr_intent		*attr;

	attr = container_of(item, struct xfs_attr_intent, xattri_list);
	xfs_attr_free_item(attr);
}

STATIC bool
xfs_attri_item_match(
	struct xfs_log_item	*lip,
	uint64_t		intent_id)
{
	return ATTRI_ITEM(lip)->attri_format.alfi_id == intent_id;
}

/* Is this recovered ATTRI format ok? */
static inline bool
xfs_attri_validate(
	struct xfs_mount		*mp,
	struct xfs_attri_log_format	*attrp)
{
	unsigned int			op = attrp->alfi_op_flags &
					     XFS_ATTRI_OP_FLAGS_TYPE_MASK;

	if (attrp->__pad != 0)
		return false;

	if (attrp->alfi_op_flags & ~XFS_ATTRI_OP_FLAGS_TYPE_MASK)
		return false;

	if (attrp->alfi_attr_filter & ~XFS_ATTRI_FILTER_MASK)
		return false;

	/* alfi_op_flags should be either a set or remove */
	switch (op) {
	case XFS_ATTRI_OP_FLAGS_SET:
	case XFS_ATTRI_OP_FLAGS_REPLACE:
	case XFS_ATTRI_OP_FLAGS_REMOVE:
		break;
	default:
		return false;
	}

	if (attrp->alfi_value_len > XATTR_SIZE_MAX)
		return false;

	if ((attrp->alfi_name_len > XATTR_NAME_MAX) ||
	    (attrp->alfi_name_len == 0))
		return false;

	return xfs_verify_ino(mp, attrp->alfi_ino);
}

/*
 * Process an attr intent item that was recovered from the log.  We need to
 * delete the attr that it describes.
 */
STATIC int
xfs_attri_item_recover(
	struct xfs_log_item		*lip,
	struct list_head		*capture_list)
{
	struct xfs_attri_log_item	*attrip = ATTRI_ITEM(lip);
	struct xfs_attr_intent		*attr;
	struct xfs_mount		*mp = lip->li_log->l_mp;
	struct xfs_inode		*ip;
	struct xfs_da_args		*args;
	struct xfs_trans		*tp;
	struct xfs_trans_res		tres;
	struct xfs_attri_log_format	*attrp;
	struct xfs_attri_log_nameval	*nv = attrip->attri_nameval;
	int				error;
	int				total;
	int				local;
	struct xfs_attrd_log_item	*done_item = NULL;

	/*
	 * First check the validity of the attr described by the ATTRI.  If any
	 * are bad, then assume that all are bad and just toss the ATTRI.
	 */
	attrp = &attrip->attri_format;
	if (!xfs_attri_validate(mp, attrp) ||
	    !xfs_attr_namecheck(nv->name.i_addr, nv->name.i_len))
		return -EFSCORRUPTED;

	error = xlog_recover_iget(mp,  attrp->alfi_ino, &ip);
	if (error)
		return error;

	attr = kmem_zalloc(sizeof(struct xfs_attr_intent) +
			   sizeof(struct xfs_da_args), KM_NOFS);
	args = (struct xfs_da_args *)(attr + 1);

	attr->xattri_da_args = args;
	attr->xattri_op_flags = attrp->alfi_op_flags &
						XFS_ATTRI_OP_FLAGS_TYPE_MASK;

	/*
	 * We're reconstructing the deferred work state structure from the
	 * recovered log item.  Grab a reference to the name/value buffer and
	 * attach it to the new work state.
	 */
	attr->xattri_nameval = xfs_attri_log_nameval_get(nv);
	ASSERT(attr->xattri_nameval);

	args->dp = ip;
	args->geo = mp->m_attr_geo;
	args->whichfork = XFS_ATTR_FORK;
	args->name = nv->name.i_addr;
	args->namelen = nv->name.i_len;
	args->hashval = xfs_da_hashname(args->name, args->namelen);
	args->attr_filter = attrp->alfi_attr_filter & XFS_ATTRI_FILTER_MASK;
	args->op_flags = XFS_DA_OP_RECOVERY | XFS_DA_OP_OKNOENT |
			 XFS_DA_OP_LOGGED;

	ASSERT(xfs_sb_version_haslogxattrs(&mp->m_sb));

	switch (attr->xattri_op_flags) {
	case XFS_ATTRI_OP_FLAGS_SET:
	case XFS_ATTRI_OP_FLAGS_REPLACE:
		args->value = nv->value.i_addr;
		args->valuelen = nv->value.i_len;
		args->total = xfs_attr_calc_size(args, &local);
		if (xfs_inode_hasattr(args->dp))
			attr->xattri_dela_state = xfs_attr_init_replace_state(args);
		else
			attr->xattri_dela_state = xfs_attr_init_add_state(args);
		break;
	case XFS_ATTRI_OP_FLAGS_REMOVE:
		if (!xfs_inode_hasattr(args->dp))
			goto out;
		attr->xattri_dela_state = xfs_attr_init_remove_state(args);
		break;
	default:
		ASSERT(0);
		error = -EFSCORRUPTED;
		goto out;
	}

	xfs_init_attr_trans(args, &tres, &total);
	error = xfs_trans_alloc(mp, &tres, total, 0, XFS_TRANS_RESERVE, &tp);
	if (error)
		goto out;

	args->trans = tp;
	done_item = xfs_trans_get_attrd(tp, attrip);

	xfs_ilock(ip, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, ip, 0);

	error = xfs_xattri_finish_update(attr, done_item);
	if (error == -EAGAIN) {
		/*
		 * There's more work to do, so add the intent item to this
		 * transaction so that we can continue it later.
		 */
		xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_ATTR, &attr->xattri_list);
		error = xfs_defer_ops_capture_and_commit(tp, capture_list);
		if (error)
			goto out_unlock;

		xfs_iunlock(ip, XFS_ILOCK_EXCL);
		xfs_irele(ip);
		return 0;
	}
	if (error) {
		xfs_trans_cancel(tp);
		goto out_unlock;
	}

	error = xfs_defer_ops_capture_and_commit(tp, capture_list);
out_unlock:
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	xfs_irele(ip);
out:
	xfs_attr_free_item(attr);
	return error;
}

/* Re-log an intent item to push the log tail forward. */
static struct xfs_log_item *
xfs_attri_item_relog(
	struct xfs_log_item		*intent,
	struct xfs_trans		*tp)
{
	struct xfs_attrd_log_item	*attrdp;
	struct xfs_attri_log_item	*old_attrip;
	struct xfs_attri_log_item	*new_attrip;
	struct xfs_attri_log_format	*new_attrp;
	struct xfs_attri_log_format	*old_attrp;

	old_attrip = ATTRI_ITEM(intent);
	old_attrp = &old_attrip->attri_format;

	tp->t_flags |= XFS_TRANS_DIRTY;
	attrdp = xfs_trans_get_attrd(tp, old_attrip);
	set_bit(XFS_LI_DIRTY, &attrdp->attrd_item.li_flags);

	/*
	 * Create a new log item that shares the same name/value buffer as the
	 * old log item.
	 */
	new_attrip = xfs_attri_init(tp->t_mountp, old_attrip->attri_nameval);
	new_attrp = &new_attrip->attri_format;

	new_attrp->alfi_ino = old_attrp->alfi_ino;
	new_attrp->alfi_op_flags = old_attrp->alfi_op_flags;
	new_attrp->alfi_value_len = old_attrp->alfi_value_len;
	new_attrp->alfi_name_len = old_attrp->alfi_name_len;
	new_attrp->alfi_attr_filter = old_attrp->alfi_attr_filter;

	xfs_trans_add_item(tp, &new_attrip->attri_item);
	set_bit(XFS_LI_DIRTY, &new_attrip->attri_item.li_flags);

	return &new_attrip->attri_item;
}

STATIC int
xlog_recover_attri_commit_pass2(
	struct xlog                     *log,
	struct list_head		*buffer_list,
	struct xlog_recover_item        *item,
	xfs_lsn_t                       lsn)
{
	struct xfs_mount                *mp = log->l_mp;
	struct xfs_attri_log_item       *attrip;
	struct xfs_attri_log_format     *attri_formatp;
	struct xfs_attri_log_nameval	*nv;
	const void			*attr_value = NULL;
	const void			*attr_name;
	int                             error;

	attri_formatp = item->ri_buf[0].i_addr;
	attr_name = item->ri_buf[1].i_addr;

	/* Validate xfs_attri_log_format before the large memory allocation */
	if (!xfs_attri_validate(mp, attri_formatp)) {
		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
		return -EFSCORRUPTED;
	}

	if (!xfs_attr_namecheck(attr_name, attri_formatp->alfi_name_len)) {
		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
		return -EFSCORRUPTED;
	}

	if (attri_formatp->alfi_value_len)
		attr_value = item->ri_buf[2].i_addr;

	/*
	 * Memory alloc failure will cause replay to abort.  We attach the
	 * name/value buffer to the recovered incore log item and drop our
	 * reference.
	 */
	nv = xfs_attri_log_nameval_alloc(attr_name,
			attri_formatp->alfi_name_len, attr_value,
			attri_formatp->alfi_value_len);
	if (!nv)
		return -ENOMEM;

	attrip = xfs_attri_init(mp, nv);
	error = xfs_attri_copy_format(&item->ri_buf[0], &attrip->attri_format);
	if (error)
		goto out;

	/*
	 * The ATTRI has two references. One for the ATTRD and one for ATTRI to
	 * ensure it makes it into the AIL. Insert the ATTRI into the AIL
	 * directly and drop the ATTRI reference. Note that
	 * xfs_trans_ail_update() drops the AIL lock.
	 */
	xfs_trans_ail_insert(log->l_ailp, &attrip->attri_item, lsn);
	xfs_attri_release(attrip);
	xfs_attri_log_nameval_put(nv);
	return 0;
out:
	xfs_attri_item_free(attrip);
	xfs_attri_log_nameval_put(nv);
	return error;
}

/*
 * This routine is called to allocate an "attr free done" log item.
 */
static struct xfs_attrd_log_item *
xfs_trans_get_attrd(struct xfs_trans		*tp,
		  struct xfs_attri_log_item	*attrip)
{
	struct xfs_attrd_log_item		*attrdp;

	ASSERT(tp != NULL);

	attrdp = kmem_cache_zalloc(xfs_attrd_cache, GFP_NOFS | __GFP_NOFAIL);

	xfs_log_item_init(tp->t_mountp, &attrdp->attrd_item, XFS_LI_ATTRD,
			  &xfs_attrd_item_ops);
	attrdp->attrd_attrip = attrip;
	attrdp->attrd_format.alfd_alf_id = attrip->attri_format.alfi_id;

	xfs_trans_add_item(tp, &attrdp->attrd_item);
	return attrdp;
}

/* Get an ATTRD so we can process all the attrs. */
static struct xfs_log_item *
xfs_attr_create_done(
	struct xfs_trans		*tp,
	struct xfs_log_item		*intent,
	unsigned int			count)
{
	if (!intent)
		return NULL;

	return &xfs_trans_get_attrd(tp, ATTRI_ITEM(intent))->attrd_item;
}

const struct xfs_defer_op_type xfs_attr_defer_type = {
	.max_items	= 1,
	.create_intent	= xfs_attr_create_intent,
	.abort_intent	= xfs_attr_abort_intent,
	.create_done	= xfs_attr_create_done,
	.finish_item	= xfs_attr_finish_item,
	.cancel_item	= xfs_attr_cancel_item,
};

/*
 * This routine is called when an ATTRD format structure is found in a committed
 * transaction in the log. Its purpose is to cancel the corresponding ATTRI if
 * it was still in the log. To do this it searches the AIL for the ATTRI with
 * an id equal to that in the ATTRD format structure. If we find it we drop
 * the ATTRD reference, which removes the ATTRI from the AIL and frees it.
 */
STATIC int
xlog_recover_attrd_commit_pass2(
	struct xlog			*log,
	struct list_head		*buffer_list,
	struct xlog_recover_item	*item,
	xfs_lsn_t			lsn)
{
	struct xfs_attrd_log_format	*attrd_formatp;

	attrd_formatp = item->ri_buf[0].i_addr;
	if (item->ri_buf[0].i_len != sizeof(struct xfs_attrd_log_format)) {
		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, NULL);
		return -EFSCORRUPTED;
	}

	xlog_recover_release_intent(log, XFS_LI_ATTRI,
				    attrd_formatp->alfd_alf_id);
	return 0;
}

static const struct xfs_item_ops xfs_attri_item_ops = {
	.flags		= XFS_ITEM_INTENT,
	.iop_size	= xfs_attri_item_size,
	.iop_format	= xfs_attri_item_format,
	.iop_unpin	= xfs_attri_item_unpin,
	.iop_release    = xfs_attri_item_release,
	.iop_recover	= xfs_attri_item_recover,
	.iop_match	= xfs_attri_item_match,
	.iop_relog	= xfs_attri_item_relog,
};

const struct xlog_recover_item_ops xlog_attri_item_ops = {
	.item_type	= XFS_LI_ATTRI,
	.commit_pass2	= xlog_recover_attri_commit_pass2,
};

static const struct xfs_item_ops xfs_attrd_item_ops = {
	.flags		= XFS_ITEM_RELEASE_WHEN_COMMITTED |
			  XFS_ITEM_INTENT_DONE,
	.iop_size	= xfs_attrd_item_size,
	.iop_format	= xfs_attrd_item_format,
	.iop_release    = xfs_attrd_item_release,
	.iop_intent	= xfs_attrd_item_intent,
};

const struct xlog_recover_item_ops xlog_attrd_item_ops = {
	.item_type	= XFS_LI_ATTRD,
	.commit_pass2	= xlog_recover_attrd_commit_pass2,
};