aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_da_format.c
blob: e6c83e1fbc8a786bfde2af6aad97e58c8bb19bd7 (plain) (blame)
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
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
/*
 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
 * Copyright (c) 2013 Red Hat, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_da_format.h"
#include "xfs_inode.h"
#include "xfs_dir2.h"

/*
 * Shortform directory ops
 */
static int
xfs_dir2_sf_entsize(
	struct xfs_dir2_sf_hdr	*hdr,
	int			len)
{
	int count = sizeof(struct xfs_dir2_sf_entry);	/* namelen + offset */

	count += len;					/* name */
	count += hdr->i8count ? sizeof(xfs_dir2_ino8_t) :
				sizeof(xfs_dir2_ino4_t); /* ino # */
	return count;
}

static int
xfs_dir3_sf_entsize(
	struct xfs_dir2_sf_hdr	*hdr,
	int			len)
{
	return xfs_dir2_sf_entsize(hdr, len) + sizeof(__uint8_t);
}

static struct xfs_dir2_sf_entry *
xfs_dir2_sf_nextentry(
	struct xfs_dir2_sf_hdr	*hdr,
	struct xfs_dir2_sf_entry *sfep)
{
	return (struct xfs_dir2_sf_entry *)
		((char *)sfep + xfs_dir2_sf_entsize(hdr, sfep->namelen));
}

static struct xfs_dir2_sf_entry *
xfs_dir3_sf_nextentry(
	struct xfs_dir2_sf_hdr	*hdr,
	struct xfs_dir2_sf_entry *sfep)
{
	return (struct xfs_dir2_sf_entry *)
		((char *)sfep + xfs_dir3_sf_entsize(hdr, sfep->namelen));
}


/*
 * For filetype enabled shortform directories, the file type field is stored at
 * the end of the name.  Because it's only a single byte, endian conversion is
 * not necessary. For non-filetype enable directories, the type is always
 * unknown and we never store the value.
 */
static __uint8_t
xfs_dir2_sfe_get_ftype(
	struct xfs_dir2_sf_entry *sfep)
{
	return XFS_DIR3_FT_UNKNOWN;
}

static void
xfs_dir2_sfe_put_ftype(
	struct xfs_dir2_sf_entry *sfep,
	__uint8_t		ftype)
{
	ASSERT(ftype < XFS_DIR3_FT_MAX);
}

static __uint8_t
xfs_dir3_sfe_get_ftype(
	struct xfs_dir2_sf_entry *sfep)
{
	__uint8_t	ftype;

	ftype = sfep->name[sfep->namelen];
	if (ftype >= XFS_DIR3_FT_MAX)
		return XFS_DIR3_FT_UNKNOWN;
	return ftype;
}

static void
xfs_dir3_sfe_put_ftype(
	struct xfs_dir2_sf_entry *sfep,
	__uint8_t		ftype)
{
	ASSERT(ftype < XFS_DIR3_FT_MAX);

	sfep->name[sfep->namelen] = ftype;
}

/*
 * Inode numbers in short-form directories can come in two versions,
 * either 4 bytes or 8 bytes wide.  These helpers deal with the
 * two forms transparently by looking at the headers i8count field.
 *
 * For 64-bit inode number the most significant byte must be zero.
 */
static xfs_ino_t
xfs_dir2_sf_get_ino(
	struct xfs_dir2_sf_hdr	*hdr,
	xfs_dir2_inou_t		*from)
{
	if (hdr->i8count)
		return get_unaligned_be64(&from->i8.i) & 0x00ffffffffffffffULL;
	else
		return get_unaligned_be32(&from->i4.i);
}

static void
xfs_dir2_sf_put_ino(
	struct xfs_dir2_sf_hdr	*hdr,
	xfs_dir2_inou_t		*to,
	xfs_ino_t		ino)
{
	ASSERT((ino & 0xff00000000000000ULL) == 0);

	if (hdr->i8count)
		put_unaligned_be64(ino, &to->i8.i);
	else
		put_unaligned_be32(ino, &to->i4.i);
}

static xfs_ino_t
xfs_dir2_sf_get_parent_ino(
	struct xfs_dir2_sf_hdr	*hdr)
{
	return xfs_dir2_sf_get_ino(hdr, &hdr->parent);
}

static void
xfs_dir2_sf_put_parent_ino(
	struct xfs_dir2_sf_hdr	*hdr,
	xfs_ino_t		ino)
{
	xfs_dir2_sf_put_ino(hdr, &hdr->parent, ino);
}

/*
 * In short-form directory entries the inode numbers are stored at variable
 * offset behind the entry name. If the entry stores a filetype value, then it
 * sits between the name and the inode number. Hence the inode numbers may only
 * be accessed through the helpers below.
 */
static xfs_ino_t
xfs_dir2_sfe_get_ino(
	struct xfs_dir2_sf_hdr	*hdr,
	struct xfs_dir2_sf_entry *sfep)
{
	return xfs_dir2_sf_get_ino(hdr,
				(xfs_dir2_inou_t *)&sfep->name[sfep->namelen]);
}

static void
xfs_dir2_sfe_put_ino(
	struct xfs_dir2_sf_hdr	*hdr,
	struct xfs_dir2_sf_entry *sfep,
	xfs_ino_t		ino)
{
	xfs_dir2_sf_put_ino(hdr,
			    (xfs_dir2_inou_t *)&sfep->name[sfep->namelen], ino);
}

static xfs_ino_t
xfs_dir3_sfe_get_ino(
	struct xfs_dir2_sf_hdr	*hdr,
	struct xfs_dir2_sf_entry *sfep)
{
	return xfs_dir2_sf_get_ino(hdr,
			(xfs_dir2_inou_t *)&sfep->name[sfep->namelen + 1]);
}

static void
xfs_dir3_sfe_put_ino(
	struct xfs_dir2_sf_hdr	*hdr,
	struct xfs_dir2_sf_entry *sfep,
	xfs_ino_t		ino)
{
	xfs_dir2_sf_put_ino(hdr,
			(xfs_dir2_inou_t *)&sfep->name[sfep->namelen + 1], ino);
}


/*
 * Directory data block operations
 */

/*
 * For special situations, the dirent size ends up fixed because we always know
 * what the size of the entry is. That's true for the "." and "..", and
 * therefore we know that they are a fixed size and hence their offsets are
 * constant, as is the first entry.
 *
 * Hence, this calculation is written as a macro to be able to be calculated at
 * compile time and so certain offsets can be calculated directly in the
 * structure initaliser via the macro. There are two macros - one for dirents
 * with ftype and without so there are no unresolvable conditionals in the
 * calculations. We also use round_up() as XFS_DIR2_DATA_ALIGN is always a power
 * of 2 and the compiler doesn't reject it (unlike roundup()).
 */
#define XFS_DIR2_DATA_ENTSIZE(n)					\
	round_up((offsetof(struct xfs_dir2_data_entry, name[0]) + (n) +	\
		 sizeof(xfs_dir2_data_off_t)), XFS_DIR2_DATA_ALIGN)

#define XFS_DIR3_DATA_ENTSIZE(n)					\
	round_up((offsetof(struct xfs_dir2_data_entry, name[0]) + (n) +	\
		 sizeof(xfs_dir2_data_off_t) + sizeof(__uint8_t)),	\
		XFS_DIR2_DATA_ALIGN)

static int
xfs_dir2_data_entsize(
	int			n)
{
	return XFS_DIR2_DATA_ENTSIZE(n);
}

static int
xfs_dir3_data_entsize(
	int			n)
{
	return XFS_DIR3_DATA_ENTSIZE(n);
}

static __uint8_t
xfs_dir2_data_get_ftype(
	struct xfs_dir2_data_entry *dep)
{
	return XFS_DIR3_FT_UNKNOWN;
}

static void
xfs_dir2_data_put_ftype(
	struct xfs_dir2_data_entry *dep,
	__uint8_t		ftype)
{
	ASSERT(ftype < XFS_DIR3_FT_MAX);
}

static __uint8_t
xfs_dir3_data_get_ftype(
	struct xfs_dir2_data_entry *dep)
{
	__uint8_t	ftype = dep->name[dep->namelen];

	ASSERT(ftype < XFS_DIR3_FT_MAX);
	if (ftype >= XFS_DIR3_FT_MAX)
		return XFS_DIR3_FT_UNKNOWN;
	return ftype;
}

static void
xfs_dir3_data_put_ftype(
	struct xfs_dir2_data_entry *dep,
	__uint8_t		type)
{
	ASSERT(type < XFS_DIR3_FT_MAX);
	ASSERT(dep->namelen != 0);

	dep->name[dep->namelen] = type;
}

/*
 * Pointer to an entry's tag word.
 */
static __be16 *
xfs_dir2_data_entry_tag_p(
	struct xfs_dir2_data_entry *dep)
{
	return (__be16 *)((char *)dep +
		xfs_dir2_data_entsize(dep->namelen) - sizeof(__be16));
}

static __be16 *
xfs_dir3_data_entry_tag_p(
	struct xfs_dir2_data_entry *dep)
{
	return (__be16 *)((char *)dep +
		xfs_dir3_data_entsize(dep->namelen) - sizeof(__be16));
}

/*
 * location of . and .. in data space (always block 0)
 */
static struct xfs_dir2_data_entry *
xfs_dir2_data_dot_entry_p(
	struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_entry *)
		((char *)hdr + sizeof(struct xfs_dir2_data_hdr));
}

static struct xfs_dir2_data_entry *
xfs_dir2_data_dotdot_entry_p(
	struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_entry *)
		((char *)hdr + sizeof(struct xfs_dir2_data_hdr) +
				XFS_DIR2_DATA_ENTSIZE(1));
}

static struct xfs_dir2_data_entry *
xfs_dir2_data_first_entry_p(
	struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_entry *)
		((char *)hdr + sizeof(struct xfs_dir2_data_hdr) +
				XFS_DIR2_DATA_ENTSIZE(1) +
				XFS_DIR2_DATA_ENTSIZE(2));
}

static struct xfs_dir2_data_entry *
xfs_dir2_ftype_data_dotdot_entry_p(
	struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_entry *)
		((char *)hdr + sizeof(struct xfs_dir2_data_hdr) +
				XFS_DIR3_DATA_ENTSIZE(1));
}

static struct xfs_dir2_data_entry *
xfs_dir2_ftype_data_first_entry_p(
	struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_entry *)
		((char *)hdr + sizeof(struct xfs_dir2_data_hdr) +
				XFS_DIR3_DATA_ENTSIZE(1) +
				XFS_DIR3_DATA_ENTSIZE(2));
}

static struct xfs_dir2_data_entry *
xfs_dir3_data_dot_entry_p(
	struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_entry *)
		((char *)hdr + sizeof(struct xfs_dir3_data_hdr));
}

static struct xfs_dir2_data_entry *
xfs_dir3_data_dotdot_entry_p(
	struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_entry *)
		((char *)hdr + sizeof(struct xfs_dir3_data_hdr) +
				XFS_DIR3_DATA_ENTSIZE(1));
}

static struct xfs_dir2_data_entry *
xfs_dir3_data_first_entry_p(
	struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_entry *)
		((char *)hdr + sizeof(struct xfs_dir3_data_hdr) +
				XFS_DIR3_DATA_ENTSIZE(1) +
				XFS_DIR3_DATA_ENTSIZE(2));
}

static struct xfs_dir2_data_free *
xfs_dir2_data_bestfree_p(struct xfs_dir2_data_hdr *hdr)
{
	return hdr->bestfree;
}

static struct xfs_dir2_data_free *
xfs_dir3_data_bestfree_p(struct xfs_dir2_data_hdr *hdr)
{
	return ((struct xfs_dir3_data_hdr *)hdr)->best_free;
}

static struct xfs_dir2_data_entry *
xfs_dir2_data_entry_p(struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_entry *)
		((char *)hdr + sizeof(struct xfs_dir2_data_hdr));
}

static struct xfs_dir2_data_unused *
xfs_dir2_data_unused_p(struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_unused *)
		((char *)hdr + sizeof(struct xfs_dir2_data_hdr));
}

static struct xfs_dir2_data_entry *
xfs_dir3_data_entry_p(struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_entry *)
		((char *)hdr + sizeof(struct xfs_dir3_data_hdr));
}

static struct xfs_dir2_data_unused *
xfs_dir3_data_unused_p(struct xfs_dir2_data_hdr *hdr)
{
	return (struct xfs_dir2_data_unused *)
		((char *)hdr + sizeof(struct xfs_dir3_data_hdr));
}


/*
 * Directory Leaf block operations
 */
static int
xfs_dir2_max_leaf_ents(struct xfs_mount *mp)
{
	return (mp->m_dirblksize - sizeof(struct xfs_dir2_leaf_hdr)) /
		(uint)sizeof(struct xfs_dir2_leaf_entry);
}

static struct xfs_dir2_leaf_entry *
xfs_dir2_leaf_ents_p(struct xfs_dir2_leaf *lp)
{
	return lp->__ents;
}

static int
xfs_dir3_max_leaf_ents(struct xfs_mount *mp)
{
	return (mp->m_dirblksize - sizeof(struct xfs_dir3_leaf_hdr)) /
		(uint)sizeof(struct xfs_dir2_leaf_entry);
}

static struct xfs_dir2_leaf_entry *
xfs_dir3_leaf_ents_p(struct xfs_dir2_leaf *lp)
{
	return ((struct xfs_dir3_leaf *)lp)->__ents;
}

static void
xfs_dir2_leaf_hdr_from_disk(
	struct xfs_dir3_icleaf_hdr	*to,
	struct xfs_dir2_leaf		*from)
{
	to->forw = be32_to_cpu(from->hdr.info.forw);
	to->back = be32_to_cpu(from->hdr.info.back);
	to->magic = be16_to_cpu(from->hdr.info.magic);
	to->count = be16_to_cpu(from->hdr.count);
	to->stale = be16_to_cpu(from->hdr.stale);

	ASSERT(to->magic == XFS_DIR2_LEAF1_MAGIC ||
	       to->magic == XFS_DIR2_LEAFN_MAGIC);
}

static void
xfs_dir2_leaf_hdr_to_disk(
	struct xfs_dir2_leaf		*to,
	struct xfs_dir3_icleaf_hdr	*from)
{
	ASSERT(from->magic == XFS_DIR2_LEAF1_MAGIC ||
	       from->magic == XFS_DIR2_LEAFN_MAGIC);

	to->hdr.info.forw = cpu_to_be32(from->forw);
	to->hdr.info.back = cpu_to_be32(from->back);
	to->hdr.info.magic = cpu_to_be16(from->magic);
	to->hdr.count = cpu_to_be16(from->count);
	to->hdr.stale = cpu_to_be16(from->stale);
}

static void
xfs_dir3_leaf_hdr_from_disk(
	struct xfs_dir3_icleaf_hdr	*to,
	struct xfs_dir2_leaf		*from)
{
	struct xfs_dir3_leaf_hdr *hdr3 = (struct xfs_dir3_leaf_hdr *)from;

	to->forw = be32_to_cpu(hdr3->info.hdr.forw);
	to->back = be32_to_cpu(hdr3->info.hdr.back);
	to->magic = be16_to_cpu(hdr3->info.hdr.magic);
	to->count = be16_to_cpu(hdr3->count);
	to->stale = be16_to_cpu(hdr3->stale);

	ASSERT(to->magic == XFS_DIR3_LEAF1_MAGIC ||
	       to->magic == XFS_DIR3_LEAFN_MAGIC);
}

static void
xfs_dir3_leaf_hdr_to_disk(
	struct xfs_dir2_leaf		*to,
	struct xfs_dir3_icleaf_hdr	*from)
{
	struct xfs_dir3_leaf_hdr *hdr3 = (struct xfs_dir3_leaf_hdr *)to;

	ASSERT(from->magic == XFS_DIR3_LEAF1_MAGIC ||
	       from->magic == XFS_DIR3_LEAFN_MAGIC);

	hdr3->info.hdr.forw = cpu_to_be32(from->forw);
	hdr3->info.hdr.back = cpu_to_be32(from->back);
	hdr3->info.hdr.magic = cpu_to_be16(from->magic);
	hdr3->count = cpu_to_be16(from->count);
	hdr3->stale = cpu_to_be16(from->stale);
}


/*
 * Directory/Attribute Node block operations
 */
static struct xfs_da_node_entry *
xfs_da2_node_tree_p(struct xfs_da_intnode *dap)
{
	return dap->__btree;
}

static struct xfs_da_node_entry *
xfs_da3_node_tree_p(struct xfs_da_intnode *dap)
{
	return ((struct xfs_da3_intnode *)dap)->__btree;
}

static void
xfs_da2_node_hdr_from_disk(
	struct xfs_da3_icnode_hdr	*to,
	struct xfs_da_intnode		*from)
{
	ASSERT(from->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC));
	to->forw = be32_to_cpu(from->hdr.info.forw);
	to->back = be32_to_cpu(from->hdr.info.back);
	to->magic = be16_to_cpu(from->hdr.info.magic);
	to->count = be16_to_cpu(from->hdr.__count);
	to->level = be16_to_cpu(from->hdr.__level);
}

static void
xfs_da2_node_hdr_to_disk(
	struct xfs_da_intnode		*to,
	struct xfs_da3_icnode_hdr	*from)
{
	ASSERT(from->magic == XFS_DA_NODE_MAGIC);
	to->hdr.info.forw = cpu_to_be32(from->forw);
	to->hdr.info.back = cpu_to_be32(from->back);
	to->hdr.info.magic = cpu_to_be16(from->magic);
	to->hdr.__count = cpu_to_be16(from->count);
	to->hdr.__level = cpu_to_be16(from->level);
}

static void
xfs_da3_node_hdr_from_disk(
	struct xfs_da3_icnode_hdr	*to,
	struct xfs_da_intnode		*from)
{
	struct xfs_da3_node_hdr *hdr3 = (struct xfs_da3_node_hdr *)from;

	ASSERT(from->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC));
	to->forw = be32_to_cpu(hdr3->info.hdr.forw);
	to->back = be32_to_cpu(hdr3->info.hdr.back);
	to->magic = be16_to_cpu(hdr3->info.hdr.magic);
	to->count = be16_to_cpu(hdr3->__count);
	to->level = be16_to_cpu(hdr3->__level);
}

static void
xfs_da3_node_hdr_to_disk(
	struct xfs_da_intnode		*to,
	struct xfs_da3_icnode_hdr	*from)
{
	struct xfs_da3_node_hdr *hdr3 = (struct xfs_da3_node_hdr *)to;

	ASSERT(from->magic == XFS_DA3_NODE_MAGIC);
	hdr3->info.hdr.forw = cpu_to_be32(from->forw);
	hdr3->info.hdr.back = cpu_to_be32(from->back);
	hdr3->info.hdr.magic = cpu_to_be16(from->magic);
	hdr3->__count = cpu_to_be16(from->count);
	hdr3->__level = cpu_to_be16(from->level);
}


/*
 * Directory free space block operations
 */
static int
xfs_dir2_free_max_bests(struct xfs_mount *mp)
{
	return (mp->m_dirblksize - sizeof(struct xfs_dir2_free_hdr)) /
		sizeof(xfs_dir2_data_off_t);
}

static __be16 *
xfs_dir2_free_bests_p(struct xfs_dir2_free *free)
{
	return (__be16 *)((char *)free + sizeof(struct xfs_dir2_free_hdr));
}

/*
 * Convert data space db to the corresponding free db.
 */
static xfs_dir2_db_t
xfs_dir2_db_to_fdb(struct xfs_mount *mp, xfs_dir2_db_t db)
{
	return XFS_DIR2_FREE_FIRSTDB(mp) + db / xfs_dir2_free_max_bests(mp);
}

/*
 * Convert data space db to the corresponding index in a free db.
 */
static int
xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db)
{
	return db % xfs_dir2_free_max_bests(mp);
}

static int
xfs_dir3_free_max_bests(struct xfs_mount *mp)
{
	return (mp->m_dirblksize - sizeof(struct xfs_dir3_free_hdr)) /
		sizeof(xfs_dir2_data_off_t);
}

static __be16 *
xfs_dir3_free_bests_p(struct xfs_dir2_free *free)
{
	return (__be16 *)((char *)free + sizeof(struct xfs_dir3_free_hdr));
}

/*
 * Convert data space db to the corresponding free db.
 */
static xfs_dir2_db_t
xfs_dir3_db_to_fdb(struct xfs_mount *mp, xfs_dir2_db_t db)
{
	return XFS_DIR2_FREE_FIRSTDB(mp) + db / xfs_dir3_free_max_bests(mp);
}

/*
 * Convert data space db to the corresponding index in a free db.
 */
static int
xfs_dir3_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db)
{
	return db % xfs_dir3_free_max_bests(mp);
}

static void
xfs_dir2_free_hdr_from_disk(
	struct xfs_dir3_icfree_hdr	*to,
	struct xfs_dir2_free		*from)
{
	to->magic = be32_to_cpu(from->hdr.magic);
	to->firstdb = be32_to_cpu(from->hdr.firstdb);
	to->nvalid = be32_to_cpu(from->hdr.nvalid);
	to->nused = be32_to_cpu(from->hdr.nused);
	ASSERT(to->magic == XFS_DIR2_FREE_MAGIC);
}

static void
xfs_dir2_free_hdr_to_disk(
	struct xfs_dir2_free		*to,
	struct xfs_dir3_icfree_hdr	*from)
{
	ASSERT(from->magic == XFS_DIR2_FREE_MAGIC);

	to->hdr.magic = cpu_to_be32(from->magic);
	to->hdr.firstdb = cpu_to_be32(from->firstdb);
	to->hdr.nvalid = cpu_to_be32(from->nvalid);
	to->hdr.nused = cpu_to_be32(from->nused);
}

static void
xfs_dir3_free_hdr_from_disk(
	struct xfs_dir3_icfree_hdr	*to,
	struct xfs_dir2_free		*from)
{
	struct xfs_dir3_free_hdr *hdr3 = (struct xfs_dir3_free_hdr *)from;

	to->magic = be32_to_cpu(hdr3->hdr.magic);
	to->firstdb = be32_to_cpu(hdr3->firstdb);
	to->nvalid = be32_to_cpu(hdr3->nvalid);
	to->nused = be32_to_cpu(hdr3->nused);

	ASSERT(to->magic == XFS_DIR3_FREE_MAGIC);
}

static void
xfs_dir3_free_hdr_to_disk(
	struct xfs_dir2_free		*to,
	struct xfs_dir3_icfree_hdr	*from)
{
	struct xfs_dir3_free_hdr *hdr3 = (struct xfs_dir3_free_hdr *)to;

	ASSERT(from->magic == XFS_DIR3_FREE_MAGIC);

	hdr3->hdr.magic = cpu_to_be32(from->magic);
	hdr3->firstdb = cpu_to_be32(from->firstdb);
	hdr3->nvalid = cpu_to_be32(from->nvalid);
	hdr3->nused = cpu_to_be32(from->nused);
}

static const struct xfs_dir_ops xfs_dir2_ops = {
	.sf_entsize = xfs_dir2_sf_entsize,
	.sf_nextentry = xfs_dir2_sf_nextentry,
	.sf_get_ftype = xfs_dir2_sfe_get_ftype,
	.sf_put_ftype = xfs_dir2_sfe_put_ftype,
	.sf_get_ino = xfs_dir2_sfe_get_ino,
	.sf_put_ino = xfs_dir2_sfe_put_ino,
	.sf_get_parent_ino = xfs_dir2_sf_get_parent_ino,
	.sf_put_parent_ino = xfs_dir2_sf_put_parent_ino,

	.data_entsize = xfs_dir2_data_entsize,
	.data_get_ftype = xfs_dir2_data_get_ftype,
	.data_put_ftype = xfs_dir2_data_put_ftype,
	.data_entry_tag_p = xfs_dir2_data_entry_tag_p,
	.data_bestfree_p = xfs_dir2_data_bestfree_p,

	.data_dot_offset = sizeof(struct xfs_dir2_data_hdr),
	.data_dotdot_offset = sizeof(struct xfs_dir2_data_hdr) +
				XFS_DIR2_DATA_ENTSIZE(1),
	.data_first_offset =  sizeof(struct xfs_dir2_data_hdr) +
				XFS_DIR2_DATA_ENTSIZE(1) +
				XFS_DIR2_DATA_ENTSIZE(2),
	.data_entry_offset = sizeof(struct xfs_dir2_data_hdr),

	.data_dot_entry_p = xfs_dir2_data_dot_entry_p,
	.data_dotdot_entry_p = xfs_dir2_data_dotdot_entry_p,
	.data_first_entry_p = xfs_dir2_data_first_entry_p,
	.data_entry_p = xfs_dir2_data_entry_p,
	.data_unused_p = xfs_dir2_data_unused_p,

	.leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr),
	.leaf_hdr_to_disk = xfs_dir2_leaf_hdr_to_disk,
	.leaf_hdr_from_disk = xfs_dir2_leaf_hdr_from_disk,
	.leaf_max_ents = xfs_dir2_max_leaf_ents,
	.leaf_ents_p = xfs_dir2_leaf_ents_p,

	.node_hdr_size = sizeof(struct xfs_da_node_hdr),
	.node_hdr_to_disk = xfs_da2_node_hdr_to_disk,
	.node_hdr_from_disk = xfs_da2_node_hdr_from_disk,
	.node_tree_p = xfs_da2_node_tree_p,

	.free_hdr_size = sizeof(struct xfs_dir2_free_hdr),
	.free_hdr_to_disk = xfs_dir2_free_hdr_to_disk,
	.free_hdr_from_disk = xfs_dir2_free_hdr_from_disk,
	.free_max_bests = xfs_dir2_free_max_bests,
	.free_bests_p = xfs_dir2_free_bests_p,
	.db_to_fdb = xfs_dir2_db_to_fdb,
	.db_to_fdindex = xfs_dir2_db_to_fdindex,
};

static const struct xfs_dir_ops xfs_dir2_ftype_ops = {
	.sf_entsize = xfs_dir3_sf_entsize,
	.sf_nextentry = xfs_dir3_sf_nextentry,
	.sf_get_ftype = xfs_dir3_sfe_get_ftype,
	.sf_put_ftype = xfs_dir3_sfe_put_ftype,
	.sf_get_ino = xfs_dir3_sfe_get_ino,
	.sf_put_ino = xfs_dir3_sfe_put_ino,
	.sf_get_parent_ino = xfs_dir2_sf_get_parent_ino,
	.sf_put_parent_ino = xfs_dir2_sf_put_parent_ino,

	.data_entsize = xfs_dir3_data_entsize,
	.data_get_ftype = xfs_dir3_data_get_ftype,
	.data_put_ftype = xfs_dir3_data_put_ftype,
	.data_entry_tag_p = xfs_dir3_data_entry_tag_p,
	.data_bestfree_p = xfs_dir2_data_bestfree_p,

	.data_dot_offset = sizeof(struct xfs_dir2_data_hdr),
	.data_dotdot_offset = sizeof(struct xfs_dir2_data_hdr) +
				XFS_DIR3_DATA_ENTSIZE(1),
	.data_first_offset =  sizeof(struct xfs_dir2_data_hdr) +
				XFS_DIR3_DATA_ENTSIZE(1) +
				XFS_DIR3_DATA_ENTSIZE(2),
	.data_entry_offset = sizeof(struct xfs_dir2_data_hdr),

	.data_dot_entry_p = xfs_dir2_data_dot_entry_p,
	.data_dotdot_entry_p = xfs_dir2_ftype_data_dotdot_entry_p,
	.data_first_entry_p = xfs_dir2_ftype_data_first_entry_p,
	.data_entry_p = xfs_dir2_data_entry_p,
	.data_unused_p = xfs_dir2_data_unused_p,

	.leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr),
	.leaf_hdr_to_disk = xfs_dir2_leaf_hdr_to_disk,
	.leaf_hdr_from_disk = xfs_dir2_leaf_hdr_from_disk,
	.leaf_max_ents = xfs_dir2_max_leaf_ents,
	.leaf_ents_p = xfs_dir2_leaf_ents_p,

	.node_hdr_size = sizeof(struct xfs_da_node_hdr),
	.node_hdr_to_disk = xfs_da2_node_hdr_to_disk,
	.node_hdr_from_disk = xfs_da2_node_hdr_from_disk,
	.node_tree_p = xfs_da2_node_tree_p,

	.free_hdr_size = sizeof(struct xfs_dir2_free_hdr),
	.free_hdr_to_disk = xfs_dir2_free_hdr_to_disk,
	.free_hdr_from_disk = xfs_dir2_free_hdr_from_disk,
	.free_max_bests = xfs_dir2_free_max_bests,
	.free_bests_p = xfs_dir2_free_bests_p,
	.db_to_fdb = xfs_dir2_db_to_fdb,
	.db_to_fdindex = xfs_dir2_db_to_fdindex,
};

static const struct xfs_dir_ops xfs_dir3_ops = {
	.sf_entsize = xfs_dir3_sf_entsize,
	.sf_nextentry = xfs_dir3_sf_nextentry,
	.sf_get_ftype = xfs_dir3_sfe_get_ftype,
	.sf_put_ftype = xfs_dir3_sfe_put_ftype,
	.sf_get_ino = xfs_dir3_sfe_get_ino,
	.sf_put_ino = xfs_dir3_sfe_put_ino,
	.sf_get_parent_ino = xfs_dir2_sf_get_parent_ino,
	.sf_put_parent_ino = xfs_dir2_sf_put_parent_ino,

	.data_entsize = xfs_dir3_data_entsize,
	.data_get_ftype = xfs_dir3_data_get_ftype,
	.data_put_ftype = xfs_dir3_data_put_ftype,
	.data_entry_tag_p = xfs_dir3_data_entry_tag_p,
	.data_bestfree_p = xfs_dir3_data_bestfree_p,

	.data_dot_offset = sizeof(struct xfs_dir3_data_hdr),
	.data_dotdot_offset = sizeof(struct xfs_dir3_data_hdr) +
				XFS_DIR3_DATA_ENTSIZE(1),
	.data_first_offset =  sizeof(struct xfs_dir3_data_hdr) +
				XFS_DIR3_DATA_ENTSIZE(1) +
				XFS_DIR3_DATA_ENTSIZE(2),
	.data_entry_offset = sizeof(struct xfs_dir3_data_hdr),

	.data_dot_entry_p = xfs_dir3_data_dot_entry_p,
	.data_dotdot_entry_p = xfs_dir3_data_dotdot_entry_p,
	.data_first_entry_p = xfs_dir3_data_first_entry_p,
	.data_entry_p = xfs_dir3_data_entry_p,
	.data_unused_p = xfs_dir3_data_unused_p,

	.leaf_hdr_size = sizeof(struct xfs_dir3_leaf_hdr),
	.leaf_hdr_to_disk = xfs_dir3_leaf_hdr_to_disk,
	.leaf_hdr_from_disk = xfs_dir3_leaf_hdr_from_disk,
	.leaf_max_ents = xfs_dir3_max_leaf_ents,
	.leaf_ents_p = xfs_dir3_leaf_ents_p,

	.node_hdr_size = sizeof(struct xfs_da3_node_hdr),
	.node_hdr_to_disk = xfs_da3_node_hdr_to_disk,
	.node_hdr_from_disk = xfs_da3_node_hdr_from_disk,
	.node_tree_p = xfs_da3_node_tree_p,

	.free_hdr_size = sizeof(struct xfs_dir3_free_hdr),
	.free_hdr_to_disk = xfs_dir3_free_hdr_to_disk,
	.free_hdr_from_disk = xfs_dir3_free_hdr_from_disk,
	.free_max_bests = xfs_dir3_free_max_bests,
	.free_bests_p = xfs_dir3_free_bests_p,
	.db_to_fdb = xfs_dir3_db_to_fdb,
	.db_to_fdindex = xfs_dir3_db_to_fdindex,
};

static const struct xfs_dir_ops xfs_dir2_nondir_ops = {
	.node_hdr_size = sizeof(struct xfs_da_node_hdr),
	.node_hdr_to_disk = xfs_da2_node_hdr_to_disk,
	.node_hdr_from_disk = xfs_da2_node_hdr_from_disk,
	.node_tree_p = xfs_da2_node_tree_p,
};

static const struct xfs_dir_ops xfs_dir3_nondir_ops = {
	.node_hdr_size = sizeof(struct xfs_da3_node_hdr),
	.node_hdr_to_disk = xfs_da3_node_hdr_to_disk,
	.node_hdr_from_disk = xfs_da3_node_hdr_from_disk,
	.node_tree_p = xfs_da3_node_tree_p,
};

/*
 * Return the ops structure according to the current config.  If we are passed
 * an inode, then that overrides the default config we use which is based on
 * feature bits.
 */
const struct xfs_dir_ops *
xfs_dir_get_ops(
	struct xfs_mount	*mp,
	struct xfs_inode	*dp)
{
	if (dp)
		return dp->d_ops;
	if (mp->m_dir_inode_ops)
		return mp->m_dir_inode_ops;
	if (xfs_sb_version_hascrc(&mp->m_sb))
		return &xfs_dir3_ops;
	if (xfs_sb_version_hasftype(&mp->m_sb))
		return &xfs_dir2_ftype_ops;
	return &xfs_dir2_ops;
}

const struct xfs_dir_ops *
xfs_nondir_get_ops(
	struct xfs_mount	*mp,
	struct xfs_inode	*dp)
{
	if (dp)
		return dp->d_ops;
	if (mp->m_nondir_inode_ops)
		return mp->m_nondir_inode_ops;
	if (xfs_sb_version_hascrc(&mp->m_sb))
		return &xfs_dir3_nondir_ops;
	return &xfs_dir2_nondir_ops;
}