summaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_extfree_item.c
blob: 3fa8789820ad9d4e5014aa4e00b1e4c3dc3ee874 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_shared.h"
#include "xfs_mount.h"
#include "xfs_ag.h"
#include "xfs_defer.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_extfree_item.h"
#include "xfs_log.h"
#include "xfs_btree.h"
#include "xfs_rmap.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_trace.h"
#include "xfs_error.h"
#include "xfs_log_priv.h"
#include "xfs_log_recover.h"

struct kmem_cache	*xfs_efi_cache;
struct kmem_cache	*xfs_efd_cache;

static const struct xfs_item_ops xfs_efi_item_ops;

static inline struct xfs_efi_log_item *EFI_ITEM(struct xfs_log_item *lip)
{
	return container_of(lip, struct xfs_efi_log_item, efi_item);
}

STATIC void
xfs_efi_item_free(
	struct xfs_efi_log_item	*efip)
{
	kmem_free(efip->efi_item.li_lv_shadow);
	if (efip->efi_format.efi_nextents > XFS_EFI_MAX_FAST_EXTENTS)
		kmem_free(efip);
	else
		kmem_cache_free(xfs_efi_cache, efip);
}

/*
 * Freeing the efi requires that we remove it from the AIL if it has already
 * been placed there. However, the EFI may not yet have been placed in the AIL
 * when called by xfs_efi_release() from EFD 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 EFI.
 */
STATIC void
xfs_efi_release(
	struct xfs_efi_log_item	*efip)
{
	ASSERT(atomic_read(&efip->efi_refcount) > 0);
	if (!atomic_dec_and_test(&efip->efi_refcount))
		return;

	xfs_trans_ail_delete(&efip->efi_item, 0);
	xfs_efi_item_free(efip);
}

STATIC void
xfs_efi_item_size(
	struct xfs_log_item	*lip,
	int			*nvecs,
	int			*nbytes)
{
	struct xfs_efi_log_item	*efip = EFI_ITEM(lip);

	*nvecs += 1;
	*nbytes += xfs_efi_log_format_sizeof(efip->efi_format.efi_nextents);
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given efi log item. We use only 1 iovec, and we point that
 * at the efi_log_format structure embedded in the efi item.
 * It is at this point that we assert that all of the extent
 * slots in the efi item have been filled.
 */
STATIC void
xfs_efi_item_format(
	struct xfs_log_item	*lip,
	struct xfs_log_vec	*lv)
{
	struct xfs_efi_log_item	*efip = EFI_ITEM(lip);
	struct xfs_log_iovec	*vecp = NULL;

	ASSERT(atomic_read(&efip->efi_next_extent) ==
				efip->efi_format.efi_nextents);

	efip->efi_format.efi_type = XFS_LI_EFI;
	efip->efi_format.efi_size = 1;

	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_EFI_FORMAT,
			&efip->efi_format,
			xfs_efi_log_format_sizeof(efip->efi_format.efi_nextents));
}


/*
 * The unpin operation is the last place an EFI 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 EFI transaction has been successfully committed to make it
 * this far. Therefore, we expect whoever committed the EFI to either construct
 * and commit the EFD or drop the EFD's reference in the event of error. Simply
 * drop the log's EFI reference now that the log is done with it.
 */
STATIC void
xfs_efi_item_unpin(
	struct xfs_log_item	*lip,
	int			remove)
{
	struct xfs_efi_log_item	*efip = EFI_ITEM(lip);
	xfs_efi_release(efip);
}

/*
 * The EFI has been either committed or aborted if the transaction has been
 * cancelled. If the transaction was cancelled, an EFD isn't going to be
 * constructed and thus we free the EFI here directly.
 */
STATIC void
xfs_efi_item_release(
	struct xfs_log_item	*lip)
{
	xfs_efi_release(EFI_ITEM(lip));
}

/*
 * Allocate and initialize an efi item with the given number of extents.
 */
STATIC struct xfs_efi_log_item *
xfs_efi_init(
	struct xfs_mount	*mp,
	uint			nextents)

{
	struct xfs_efi_log_item	*efip;

	ASSERT(nextents > 0);
	if (nextents > XFS_EFI_MAX_FAST_EXTENTS) {
		efip = kzalloc(xfs_efi_log_item_sizeof(nextents),
				GFP_KERNEL | __GFP_NOFAIL);
	} else {
		efip = kmem_cache_zalloc(xfs_efi_cache,
					 GFP_KERNEL | __GFP_NOFAIL);
	}

	xfs_log_item_init(mp, &efip->efi_item, XFS_LI_EFI, &xfs_efi_item_ops);
	efip->efi_format.efi_nextents = nextents;
	efip->efi_format.efi_id = (uintptr_t)(void *)efip;
	atomic_set(&efip->efi_next_extent, 0);
	atomic_set(&efip->efi_refcount, 2);

	return efip;
}

/*
 * Copy an EFI format buffer from the given buf, and into the destination
 * EFI format structure.
 * The given buffer can be in 32 bit or 64 bit form (which has different padding),
 * one of which will be the native format for this kernel.
 * It will handle the conversion of formats if necessary.
 */
STATIC int
xfs_efi_copy_format(xfs_log_iovec_t *buf, xfs_efi_log_format_t *dst_efi_fmt)
{
	xfs_efi_log_format_t *src_efi_fmt = buf->i_addr;
	uint i;
	uint len = xfs_efi_log_format_sizeof(src_efi_fmt->efi_nextents);
	uint len32 = xfs_efi_log_format32_sizeof(src_efi_fmt->efi_nextents);
	uint len64 = xfs_efi_log_format64_sizeof(src_efi_fmt->efi_nextents);

	if (buf->i_len == len) {
		memcpy(dst_efi_fmt, src_efi_fmt,
		       offsetof(struct xfs_efi_log_format, efi_extents));
		for (i = 0; i < src_efi_fmt->efi_nextents; i++)
			memcpy(&dst_efi_fmt->efi_extents[i],
			       &src_efi_fmt->efi_extents[i],
			       sizeof(struct xfs_extent));
		return 0;
	} else if (buf->i_len == len32) {
		xfs_efi_log_format_32_t *src_efi_fmt_32 = buf->i_addr;

		dst_efi_fmt->efi_type     = src_efi_fmt_32->efi_type;
		dst_efi_fmt->efi_size     = src_efi_fmt_32->efi_size;
		dst_efi_fmt->efi_nextents = src_efi_fmt_32->efi_nextents;
		dst_efi_fmt->efi_id       = src_efi_fmt_32->efi_id;
		for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
			dst_efi_fmt->efi_extents[i].ext_start =
				src_efi_fmt_32->efi_extents[i].ext_start;
			dst_efi_fmt->efi_extents[i].ext_len =
				src_efi_fmt_32->efi_extents[i].ext_len;
		}
		return 0;
	} else if (buf->i_len == len64) {
		xfs_efi_log_format_64_t *src_efi_fmt_64 = buf->i_addr;

		dst_efi_fmt->efi_type     = src_efi_fmt_64->efi_type;
		dst_efi_fmt->efi_size     = src_efi_fmt_64->efi_size;
		dst_efi_fmt->efi_nextents = src_efi_fmt_64->efi_nextents;
		dst_efi_fmt->efi_id       = src_efi_fmt_64->efi_id;
		for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
			dst_efi_fmt->efi_extents[i].ext_start =
				src_efi_fmt_64->efi_extents[i].ext_start;
			dst_efi_fmt->efi_extents[i].ext_len =
				src_efi_fmt_64->efi_extents[i].ext_len;
		}
		return 0;
	}
	XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, NULL, buf->i_addr,
			buf->i_len);
	return -EFSCORRUPTED;
}

static inline struct xfs_efd_log_item *EFD_ITEM(struct xfs_log_item *lip)
{
	return container_of(lip, struct xfs_efd_log_item, efd_item);
}

STATIC void
xfs_efd_item_free(struct xfs_efd_log_item *efdp)
{
	kmem_free(efdp->efd_item.li_lv_shadow);
	if (efdp->efd_format.efd_nextents > XFS_EFD_MAX_FAST_EXTENTS)
		kmem_free(efdp);
	else
		kmem_cache_free(xfs_efd_cache, efdp);
}

STATIC void
xfs_efd_item_size(
	struct xfs_log_item	*lip,
	int			*nvecs,
	int			*nbytes)
{
	struct xfs_efd_log_item	*efdp = EFD_ITEM(lip);

	*nvecs += 1;
	*nbytes += xfs_efd_log_format_sizeof(efdp->efd_format.efd_nextents);
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given efd log item. We use only 1 iovec, and we point that
 * at the efd_log_format structure embedded in the efd item.
 * It is at this point that we assert that all of the extent
 * slots in the efd item have been filled.
 */
STATIC void
xfs_efd_item_format(
	struct xfs_log_item	*lip,
	struct xfs_log_vec	*lv)
{
	struct xfs_efd_log_item	*efdp = EFD_ITEM(lip);
	struct xfs_log_iovec	*vecp = NULL;

	ASSERT(efdp->efd_next_extent == efdp->efd_format.efd_nextents);

	efdp->efd_format.efd_type = XFS_LI_EFD;
	efdp->efd_format.efd_size = 1;

	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_EFD_FORMAT,
			&efdp->efd_format,
			xfs_efd_log_format_sizeof(efdp->efd_format.efd_nextents));
}

/*
 * The EFD is either committed or aborted if the transaction is cancelled. If
 * the transaction is cancelled, drop our reference to the EFI and free the EFD.
 */
STATIC void
xfs_efd_item_release(
	struct xfs_log_item	*lip)
{
	struct xfs_efd_log_item	*efdp = EFD_ITEM(lip);

	xfs_efi_release(efdp->efd_efip);
	xfs_efd_item_free(efdp);
}

static struct xfs_log_item *
xfs_efd_item_intent(
	struct xfs_log_item	*lip)
{
	return &EFD_ITEM(lip)->efd_efip->efi_item;
}

static const struct xfs_item_ops xfs_efd_item_ops = {
	.flags		= XFS_ITEM_RELEASE_WHEN_COMMITTED |
			  XFS_ITEM_INTENT_DONE,
	.iop_size	= xfs_efd_item_size,
	.iop_format	= xfs_efd_item_format,
	.iop_release	= xfs_efd_item_release,
	.iop_intent	= xfs_efd_item_intent,
};

/*
 * Allocate an "extent free done" log item that will hold nextents worth of
 * extents.  The caller must use all nextents extents, because we are not
 * flexible about this at all.
 */
static struct xfs_efd_log_item *
xfs_trans_get_efd(
	struct xfs_trans		*tp,
	struct xfs_efi_log_item		*efip,
	unsigned int			nextents)
{
	struct xfs_efd_log_item		*efdp;

	ASSERT(nextents > 0);

	if (nextents > XFS_EFD_MAX_FAST_EXTENTS) {
		efdp = kzalloc(xfs_efd_log_item_sizeof(nextents),
				GFP_KERNEL | __GFP_NOFAIL);
	} else {
		efdp = kmem_cache_zalloc(xfs_efd_cache,
					GFP_KERNEL | __GFP_NOFAIL);
	}

	xfs_log_item_init(tp->t_mountp, &efdp->efd_item, XFS_LI_EFD,
			  &xfs_efd_item_ops);
	efdp->efd_efip = efip;
	efdp->efd_format.efd_nextents = nextents;
	efdp->efd_format.efd_efi_id = efip->efi_format.efi_id;

	xfs_trans_add_item(tp, &efdp->efd_item);
	return efdp;
}

/*
 * Fill the EFD with all extents from the EFI when we need to roll the
 * transaction and continue with a new EFI.
 *
 * This simply copies all the extents in the EFI to the EFD rather than make
 * assumptions about which extents in the EFI have already been processed. We
 * currently keep the xefi list in the same order as the EFI extent list, but
 * that may not always be the case. Copying everything avoids leaving a landmine
 * were we fail to cancel all the extents in an EFI if the xefi list is
 * processed in a different order to the extents in the EFI.
 */
static void
xfs_efd_from_efi(
	struct xfs_efd_log_item	*efdp)
{
	struct xfs_efi_log_item *efip = efdp->efd_efip;
	uint                    i;

	ASSERT(efip->efi_format.efi_nextents > 0);
	ASSERT(efdp->efd_next_extent < efip->efi_format.efi_nextents);

	for (i = 0; i < efip->efi_format.efi_nextents; i++) {
	       efdp->efd_format.efd_extents[i] =
		       efip->efi_format.efi_extents[i];
	}
	efdp->efd_next_extent = efip->efi_format.efi_nextents;
}

/*
 * Free an extent and log it to the EFD. Note that the transaction is marked
 * dirty regardless of whether the extent free succeeds or fails to support the
 * EFI/EFD lifecycle rules.
 */
static int
xfs_trans_free_extent(
	struct xfs_trans		*tp,
	struct xfs_efd_log_item		*efdp,
	struct xfs_extent_free_item	*xefi)
{
	struct xfs_owner_info		oinfo = { };
	struct xfs_mount		*mp = tp->t_mountp;
	struct xfs_extent		*extp;
	uint				next_extent;
	xfs_agblock_t			agbno = XFS_FSB_TO_AGBNO(mp,
							xefi->xefi_startblock);
	int				error;

	oinfo.oi_owner = xefi->xefi_owner;
	if (xefi->xefi_flags & XFS_EFI_ATTR_FORK)
		oinfo.oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
	if (xefi->xefi_flags & XFS_EFI_BMBT_BLOCK)
		oinfo.oi_flags |= XFS_OWNER_INFO_BMBT_BLOCK;

	trace_xfs_bmap_free_deferred(tp->t_mountp, xefi->xefi_pag->pag_agno, 0,
			agbno, xefi->xefi_blockcount);

	error = __xfs_free_extent(tp, xefi->xefi_pag, agbno,
			xefi->xefi_blockcount, &oinfo, xefi->xefi_agresv,
			xefi->xefi_flags & XFS_EFI_SKIP_DISCARD);

	/*
	 * Mark the transaction dirty, even on error. This ensures the
	 * transaction is aborted, which:
	 *
	 * 1.) releases the EFI and frees the EFD
	 * 2.) shuts down the filesystem
	 */
	tp->t_flags |= XFS_TRANS_DIRTY | XFS_TRANS_HAS_INTENT_DONE;
	set_bit(XFS_LI_DIRTY, &efdp->efd_item.li_flags);

	/*
	 * If we need a new transaction to make progress, the caller will log a
	 * new EFI with the current contents. It will also log an EFD to cancel
	 * the existing EFI, and so we need to copy all the unprocessed extents
	 * in this EFI to the EFD so this works correctly.
	 */
	if (error == -EAGAIN) {
		xfs_efd_from_efi(efdp);
		return error;
	}

	next_extent = efdp->efd_next_extent;
	ASSERT(next_extent < efdp->efd_format.efd_nextents);
	extp = &(efdp->efd_format.efd_extents[next_extent]);
	extp->ext_start = xefi->xefi_startblock;
	extp->ext_len = xefi->xefi_blockcount;
	efdp->efd_next_extent++;

	return error;
}

/* Sort bmap items by AG. */
static int
xfs_extent_free_diff_items(
	void				*priv,
	const struct list_head		*a,
	const struct list_head		*b)
{
	struct xfs_extent_free_item	*ra;
	struct xfs_extent_free_item	*rb;

	ra = container_of(a, struct xfs_extent_free_item, xefi_list);
	rb = container_of(b, struct xfs_extent_free_item, xefi_list);

	return ra->xefi_pag->pag_agno - rb->xefi_pag->pag_agno;
}

/* Log a free extent to the intent item. */
STATIC void
xfs_extent_free_log_item(
	struct xfs_trans		*tp,
	struct xfs_efi_log_item		*efip,
	struct xfs_extent_free_item	*xefi)
{
	uint				next_extent;
	struct xfs_extent		*extp;

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

	/*
	 * atomic_inc_return gives us the value after the increment;
	 * we want to use it as an array index so we need to subtract 1 from
	 * it.
	 */
	next_extent = atomic_inc_return(&efip->efi_next_extent) - 1;
	ASSERT(next_extent < efip->efi_format.efi_nextents);
	extp = &efip->efi_format.efi_extents[next_extent];
	extp->ext_start = xefi->xefi_startblock;
	extp->ext_len = xefi->xefi_blockcount;
}

static struct xfs_log_item *
xfs_extent_free_create_intent(
	struct xfs_trans		*tp,
	struct list_head		*items,
	unsigned int			count,
	bool				sort)
{
	struct xfs_mount		*mp = tp->t_mountp;
	struct xfs_efi_log_item		*efip = xfs_efi_init(mp, count);
	struct xfs_extent_free_item	*xefi;

	ASSERT(count > 0);

	xfs_trans_add_item(tp, &efip->efi_item);
	if (sort)
		list_sort(mp, items, xfs_extent_free_diff_items);
	list_for_each_entry(xefi, items, xefi_list)
		xfs_extent_free_log_item(tp, efip, xefi);
	return &efip->efi_item;
}

/* Get an EFD so we can process all the free extents. */
static struct xfs_log_item *
xfs_extent_free_create_done(
	struct xfs_trans		*tp,
	struct xfs_log_item		*intent,
	unsigned int			count)
{
	return &xfs_trans_get_efd(tp, EFI_ITEM(intent), count)->efd_item;
}

/* Take a passive ref to the AG containing the space we're freeing. */
void
xfs_extent_free_get_group(
	struct xfs_mount		*mp,
	struct xfs_extent_free_item	*xefi)
{
	xfs_agnumber_t			agno;

	agno = XFS_FSB_TO_AGNO(mp, xefi->xefi_startblock);
	xefi->xefi_pag = xfs_perag_intent_get(mp, agno);
}

/* Release a passive AG ref after some freeing work. */
static inline void
xfs_extent_free_put_group(
	struct xfs_extent_free_item	*xefi)
{
	xfs_perag_intent_put(xefi->xefi_pag);
}

/* Process a free extent. */
STATIC int
xfs_extent_free_finish_item(
	struct xfs_trans		*tp,
	struct xfs_log_item		*done,
	struct list_head		*item,
	struct xfs_btree_cur		**state)
{
	struct xfs_extent_free_item	*xefi;
	int				error;

	xefi = container_of(item, struct xfs_extent_free_item, xefi_list);

	error = xfs_trans_free_extent(tp, EFD_ITEM(done), xefi);

	/*
	 * Don't free the XEFI if we need a new transaction to complete
	 * processing of it.
	 */
	if (error == -EAGAIN)
		return error;

	xfs_extent_free_put_group(xefi);
	kmem_cache_free(xfs_extfree_item_cache, xefi);
	return error;
}

/* Abort all pending EFIs. */
STATIC void
xfs_extent_free_abort_intent(
	struct xfs_log_item		*intent)
{
	xfs_efi_release(EFI_ITEM(intent));
}

/* Cancel a free extent. */
STATIC void
xfs_extent_free_cancel_item(
	struct list_head		*item)
{
	struct xfs_extent_free_item	*xefi;

	xefi = container_of(item, struct xfs_extent_free_item, xefi_list);

	xfs_extent_free_put_group(xefi);
	kmem_cache_free(xfs_extfree_item_cache, xefi);
}

const struct xfs_defer_op_type xfs_extent_free_defer_type = {
	.max_items	= XFS_EFI_MAX_FAST_EXTENTS,
	.create_intent	= xfs_extent_free_create_intent,
	.abort_intent	= xfs_extent_free_abort_intent,
	.create_done	= xfs_extent_free_create_done,
	.finish_item	= xfs_extent_free_finish_item,
	.cancel_item	= xfs_extent_free_cancel_item,
};

/*
 * AGFL blocks are accounted differently in the reserve pools and are not
 * inserted into the busy extent list.
 */
STATIC int
xfs_agfl_free_finish_item(
	struct xfs_trans		*tp,
	struct xfs_log_item		*done,
	struct list_head		*item,
	struct xfs_btree_cur		**state)
{
	struct xfs_owner_info		oinfo = { };
	struct xfs_mount		*mp = tp->t_mountp;
	struct xfs_efd_log_item		*efdp = EFD_ITEM(done);
	struct xfs_extent_free_item	*xefi;
	struct xfs_extent		*extp;
	struct xfs_buf			*agbp;
	int				error;
	xfs_agblock_t			agbno;
	uint				next_extent;

	xefi = container_of(item, struct xfs_extent_free_item, xefi_list);
	ASSERT(xefi->xefi_blockcount == 1);
	agbno = XFS_FSB_TO_AGBNO(mp, xefi->xefi_startblock);
	oinfo.oi_owner = xefi->xefi_owner;

	trace_xfs_agfl_free_deferred(mp, xefi->xefi_pag->pag_agno, 0, agbno,
			xefi->xefi_blockcount);

	error = xfs_alloc_read_agf(xefi->xefi_pag, tp, 0, &agbp);
	if (!error)
		error = xfs_free_agfl_block(tp, xefi->xefi_pag->pag_agno,
				agbno, agbp, &oinfo);

	/*
	 * Mark the transaction dirty, even on error. This ensures the
	 * transaction is aborted, which:
	 *
	 * 1.) releases the EFI and frees the EFD
	 * 2.) shuts down the filesystem
	 */
	tp->t_flags |= XFS_TRANS_DIRTY;
	set_bit(XFS_LI_DIRTY, &efdp->efd_item.li_flags);

	next_extent = efdp->efd_next_extent;
	ASSERT(next_extent < efdp->efd_format.efd_nextents);
	extp = &(efdp->efd_format.efd_extents[next_extent]);
	extp->ext_start = xefi->xefi_startblock;
	extp->ext_len = xefi->xefi_blockcount;
	efdp->efd_next_extent++;

	xfs_extent_free_put_group(xefi);
	kmem_cache_free(xfs_extfree_item_cache, xefi);
	return error;
}

/* sub-type with special handling for AGFL deferred frees */
const struct xfs_defer_op_type xfs_agfl_free_defer_type = {
	.max_items	= XFS_EFI_MAX_FAST_EXTENTS,
	.create_intent	= xfs_extent_free_create_intent,
	.abort_intent	= xfs_extent_free_abort_intent,
	.create_done	= xfs_extent_free_create_done,
	.finish_item	= xfs_agfl_free_finish_item,
	.cancel_item	= xfs_extent_free_cancel_item,
};

/* Is this recovered EFI ok? */
static inline bool
xfs_efi_validate_ext(
	struct xfs_mount		*mp,
	struct xfs_extent		*extp)
{
	return xfs_verify_fsbext(mp, extp->ext_start, extp->ext_len);
}

/*
 * Process an extent free intent item that was recovered from
 * the log.  We need to free the extents that it describes.
 */
STATIC int
xfs_efi_item_recover(
	struct xfs_log_item		*lip,
	struct list_head		*capture_list)
{
	struct xfs_trans_res		resv;
	struct xfs_efi_log_item		*efip = EFI_ITEM(lip);
	struct xfs_mount		*mp = lip->li_log->l_mp;
	struct xfs_efd_log_item		*efdp;
	struct xfs_trans		*tp;
	int				i;
	int				error = 0;
	bool				requeue_only = false;

	/*
	 * First check the validity of the extents described by the
	 * EFI.  If any are bad, then assume that all are bad and
	 * just toss the EFI.
	 */
	for (i = 0; i < efip->efi_format.efi_nextents; i++) {
		if (!xfs_efi_validate_ext(mp,
					&efip->efi_format.efi_extents[i])) {
			XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
					&efip->efi_format,
					sizeof(efip->efi_format));
			return -EFSCORRUPTED;
		}
	}

	resv = xlog_recover_resv(&M_RES(mp)->tr_itruncate);
	error = xfs_trans_alloc(mp, &resv, 0, 0, 0, &tp);
	if (error)
		return error;
	efdp = xfs_trans_get_efd(tp, efip, efip->efi_format.efi_nextents);

	for (i = 0; i < efip->efi_format.efi_nextents; i++) {
		struct xfs_extent_free_item	fake = {
			.xefi_owner		= XFS_RMAP_OWN_UNKNOWN,
			.xefi_agresv		= XFS_AG_RESV_NONE,
		};
		struct xfs_extent		*extp;

		extp = &efip->efi_format.efi_extents[i];

		fake.xefi_startblock = extp->ext_start;
		fake.xefi_blockcount = extp->ext_len;

		if (!requeue_only) {
			xfs_extent_free_get_group(mp, &fake);
			error = xfs_trans_free_extent(tp, efdp, &fake);
			xfs_extent_free_put_group(&fake);
		}

		/*
		 * If we can't free the extent without potentially deadlocking,
		 * requeue the rest of the extents to a new so that they get
		 * run again later with a new transaction context.
		 */
		if (error == -EAGAIN || requeue_only) {
			error = xfs_free_extent_later(tp, fake.xefi_startblock,
					fake.xefi_blockcount,
					&XFS_RMAP_OINFO_ANY_OWNER,
					fake.xefi_agresv);
			if (!error) {
				requeue_only = true;
				continue;
			}
		}

		if (error == -EFSCORRUPTED)
			XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
					extp, sizeof(*extp));
		if (error)
			goto abort_error;

	}

	return xfs_defer_ops_capture_and_commit(tp, capture_list);

abort_error:
	xfs_trans_cancel(tp);
	return error;
}

STATIC bool
xfs_efi_item_match(
	struct xfs_log_item	*lip,
	uint64_t		intent_id)
{
	return EFI_ITEM(lip)->efi_format.efi_id == intent_id;
}

/* Relog an intent item to push the log tail forward. */
static struct xfs_log_item *
xfs_efi_item_relog(
	struct xfs_log_item		*intent,
	struct xfs_trans		*tp)
{
	struct xfs_efd_log_item		*efdp;
	struct xfs_efi_log_item		*efip;
	struct xfs_extent		*extp;
	unsigned int			count;

	count = EFI_ITEM(intent)->efi_format.efi_nextents;
	extp = EFI_ITEM(intent)->efi_format.efi_extents;

	tp->t_flags |= XFS_TRANS_DIRTY;
	efdp = xfs_trans_get_efd(tp, EFI_ITEM(intent), count);
	efdp->efd_next_extent = count;
	memcpy(efdp->efd_format.efd_extents, extp, count * sizeof(*extp));
	set_bit(XFS_LI_DIRTY, &efdp->efd_item.li_flags);

	efip = xfs_efi_init(tp->t_mountp, count);
	memcpy(efip->efi_format.efi_extents, extp, count * sizeof(*extp));
	atomic_set(&efip->efi_next_extent, count);
	xfs_trans_add_item(tp, &efip->efi_item);
	set_bit(XFS_LI_DIRTY, &efip->efi_item.li_flags);
	return &efip->efi_item;
}

static const struct xfs_item_ops xfs_efi_item_ops = {
	.flags		= XFS_ITEM_INTENT,
	.iop_size	= xfs_efi_item_size,
	.iop_format	= xfs_efi_item_format,
	.iop_unpin	= xfs_efi_item_unpin,
	.iop_release	= xfs_efi_item_release,
	.iop_recover	= xfs_efi_item_recover,
	.iop_match	= xfs_efi_item_match,
	.iop_relog	= xfs_efi_item_relog,
};

/*
 * This routine is called to create an in-core extent free intent
 * item from the efi format structure which was logged on disk.
 * It allocates an in-core efi, copies the extents from the format
 * structure into it, and adds the efi to the AIL with the given
 * LSN.
 */
STATIC int
xlog_recover_efi_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_efi_log_item		*efip;
	struct xfs_efi_log_format	*efi_formatp;
	int				error;

	efi_formatp = item->ri_buf[0].i_addr;

	if (item->ri_buf[0].i_len < xfs_efi_log_format_sizeof(0)) {
		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
				item->ri_buf[0].i_addr, item->ri_buf[0].i_len);
		return -EFSCORRUPTED;
	}

	efip = xfs_efi_init(mp, efi_formatp->efi_nextents);
	error = xfs_efi_copy_format(&item->ri_buf[0], &efip->efi_format);
	if (error) {
		xfs_efi_item_free(efip);
		return error;
	}
	atomic_set(&efip->efi_next_extent, efi_formatp->efi_nextents);
	/*
	 * Insert the intent into the AIL directly and drop one reference so
	 * that finishing or canceling the work will drop the other.
	 */
	xfs_trans_ail_insert(log->l_ailp, &efip->efi_item, lsn);
	xfs_efi_release(efip);
	return 0;
}

const struct xlog_recover_item_ops xlog_efi_item_ops = {
	.item_type		= XFS_LI_EFI,
	.commit_pass2		= xlog_recover_efi_commit_pass2,
};

/*
 * This routine is called when an EFD format structure is found in a committed
 * transaction in the log. Its purpose is to cancel the corresponding EFI if it
 * was still in the log. To do this it searches the AIL for the EFI with an id
 * equal to that in the EFD format structure. If we find it we drop the EFD
 * reference, which removes the EFI from the AIL and frees it.
 */
STATIC int
xlog_recover_efd_commit_pass2(
	struct xlog			*log,
	struct list_head		*buffer_list,
	struct xlog_recover_item	*item,
	xfs_lsn_t			lsn)
{
	struct xfs_efd_log_format	*efd_formatp;
	int				buflen = item->ri_buf[0].i_len;

	efd_formatp = item->ri_buf[0].i_addr;

	if (buflen < sizeof(struct xfs_efd_log_format)) {
		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, log->l_mp,
				efd_formatp, buflen);
		return -EFSCORRUPTED;
	}

	if (item->ri_buf[0].i_len != xfs_efd_log_format32_sizeof(
						efd_formatp->efd_nextents) &&
	    item->ri_buf[0].i_len != xfs_efd_log_format64_sizeof(
						efd_formatp->efd_nextents)) {
		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, log->l_mp,
				efd_formatp, buflen);
		return -EFSCORRUPTED;
	}

	xlog_recover_release_intent(log, XFS_LI_EFI, efd_formatp->efd_efi_id);
	return 0;
}

const struct xlog_recover_item_ops xlog_efd_item_ops = {
	.item_type		= XFS_LI_EFD,
	.commit_pass2		= xlog_recover_efd_commit_pass2,
};