summaryrefslogtreecommitdiff
path: root/fs/xfs/libxfs/xfs_dir2_sf.c
blob: 2463b5d73447244fa559b393ab96017610135c89 (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
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#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_mount.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_dir2.h"
#include "xfs_dir2_priv.h"
#include "xfs_trace.h"

/*
 * Prototypes for internal functions.
 */
static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
				     xfs_dir2_sf_entry_t *sfep,
				     xfs_dir2_data_aoff_t offset,
				     int new_isize);
static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
				     int new_isize);
static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
				    xfs_dir2_sf_entry_t **sfepp,
				    xfs_dir2_data_aoff_t *offsetp);
#ifdef DEBUG
static void xfs_dir2_sf_check(xfs_da_args_t *args);
#else
#define	xfs_dir2_sf_check(args)
#endif /* DEBUG */

static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
static void xfs_dir2_sf_toino8(xfs_da_args_t *args);

int
xfs_dir2_sf_entsize(
	struct xfs_mount	*mp,
	struct xfs_dir2_sf_hdr	*hdr,
	int			len)
{
	int			count = len;

	count += sizeof(struct xfs_dir2_sf_entry);	/* namelen + offset */
	count += hdr->i8count ? XFS_INO64_SIZE : XFS_INO32_SIZE; /* ino # */

	if (xfs_sb_version_hasftype(&mp->m_sb))
		count += sizeof(uint8_t);
	return count;
}

struct xfs_dir2_sf_entry *
xfs_dir2_sf_nextentry(
	struct xfs_mount	*mp,
	struct xfs_dir2_sf_hdr	*hdr,
	struct xfs_dir2_sf_entry *sfep)
{
	return (void *)sfep + xfs_dir2_sf_entsize(mp, hdr, sfep->namelen);
}

/*
 * 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.  The actual inode numbers can
 * come in two formats as well, either 4 bytes or 8 bytes wide.
 */
xfs_ino_t
xfs_dir2_sf_get_ino(
	struct xfs_mount		*mp,
	struct xfs_dir2_sf_hdr		*hdr,
	struct xfs_dir2_sf_entry	*sfep)
{
	uint8_t				*from = sfep->name + sfep->namelen;

	if (xfs_sb_version_hasftype(&mp->m_sb))
		from++;

	if (!hdr->i8count)
		return get_unaligned_be32(from);
	return get_unaligned_be64(from) & XFS_MAXINUMBER;
}

void
xfs_dir2_sf_put_ino(
	struct xfs_mount		*mp,
	struct xfs_dir2_sf_hdr		*hdr,
	struct xfs_dir2_sf_entry	*sfep,
	xfs_ino_t			ino)
{
	uint8_t				*to = sfep->name + sfep->namelen;

	ASSERT(ino <= XFS_MAXINUMBER);

	if (xfs_sb_version_hasftype(&mp->m_sb))
		to++;

	if (hdr->i8count)
		put_unaligned_be64(ino, to);
	else
		put_unaligned_be32(ino, to);
}

xfs_ino_t
xfs_dir2_sf_get_parent_ino(
	struct xfs_dir2_sf_hdr	*hdr)
{
	if (!hdr->i8count)
		return get_unaligned_be32(hdr->parent);
	return get_unaligned_be64(hdr->parent) & XFS_MAXINUMBER;
}

void
xfs_dir2_sf_put_parent_ino(
	struct xfs_dir2_sf_hdr		*hdr,
	xfs_ino_t			ino)
{
	ASSERT(ino <= XFS_MAXINUMBER);

	if (hdr->i8count)
		put_unaligned_be64(ino, hdr->parent);
	else
		put_unaligned_be32(ino, hdr->parent);
}

/*
 * The file type field is stored at the end of the name for filetype enabled
 * shortform directories, or not at all otherwise.
 */
uint8_t
xfs_dir2_sf_get_ftype(
	struct xfs_mount		*mp,
	struct xfs_dir2_sf_entry	*sfep)
{
	if (xfs_sb_version_hasftype(&mp->m_sb)) {
		uint8_t			ftype = sfep->name[sfep->namelen];

		if (ftype < XFS_DIR3_FT_MAX)
			return ftype;
	}

	return XFS_DIR3_FT_UNKNOWN;
}

void
xfs_dir2_sf_put_ftype(
	struct xfs_mount	*mp,
	struct xfs_dir2_sf_entry *sfep,
	uint8_t			ftype)
{
	ASSERT(ftype < XFS_DIR3_FT_MAX);

	if (xfs_sb_version_hasftype(&mp->m_sb))
		sfep->name[sfep->namelen] = ftype;
}

/*
 * Given a block directory (dp/block), calculate its size as a shortform (sf)
 * directory and a header for the sf directory, if it will fit it the
 * space currently present in the inode.  If it won't fit, the output
 * size is too big (but not accurate).
 */
int						/* size for sf form */
xfs_dir2_block_sfsize(
	xfs_inode_t		*dp,		/* incore inode pointer */
	xfs_dir2_data_hdr_t	*hdr,		/* block directory data */
	xfs_dir2_sf_hdr_t	*sfhp)		/* output: header for sf form */
{
	xfs_dir2_dataptr_t	addr;		/* data entry address */
	xfs_dir2_leaf_entry_t	*blp;		/* leaf area of the block */
	xfs_dir2_block_tail_t	*btp;		/* tail area of the block */
	int			count;		/* shortform entry count */
	xfs_dir2_data_entry_t	*dep;		/* data entry in the block */
	int			i;		/* block entry index */
	int			i8count;	/* count of big-inode entries */
	int			isdot;		/* entry is "." */
	int			isdotdot;	/* entry is ".." */
	xfs_mount_t		*mp;		/* mount structure pointer */
	int			namelen;	/* total name bytes */
	xfs_ino_t		parent = 0;	/* parent inode number */
	int			size=0;		/* total computed size */
	int			has_ftype;
	struct xfs_da_geometry	*geo;

	mp = dp->i_mount;
	geo = mp->m_dir_geo;

	/*
	 * if there is a filetype field, add the extra byte to the namelen
	 * for each entry that we see.
	 */
	has_ftype = xfs_sb_version_hasftype(&mp->m_sb) ? 1 : 0;

	count = i8count = namelen = 0;
	btp = xfs_dir2_block_tail_p(geo, hdr);
	blp = xfs_dir2_block_leaf_p(btp);

	/*
	 * Iterate over the block's data entries by using the leaf pointers.
	 */
	for (i = 0; i < be32_to_cpu(btp->count); i++) {
		if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
			continue;
		/*
		 * Calculate the pointer to the entry at hand.
		 */
		dep = (xfs_dir2_data_entry_t *)((char *)hdr +
				xfs_dir2_dataptr_to_off(geo, addr));
		/*
		 * Detect . and .., so we can special-case them.
		 * . is not included in sf directories.
		 * .. is included by just the parent inode number.
		 */
		isdot = dep->namelen == 1 && dep->name[0] == '.';
		isdotdot =
			dep->namelen == 2 &&
			dep->name[0] == '.' && dep->name[1] == '.';

		if (!isdot)
			i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;

		/* take into account the file type field */
		if (!isdot && !isdotdot) {
			count++;
			namelen += dep->namelen + has_ftype;
		} else if (isdotdot)
			parent = be64_to_cpu(dep->inumber);
		/*
		 * Calculate the new size, see if we should give up yet.
		 */
		size = xfs_dir2_sf_hdr_size(i8count) +	/* header */
		       count * 3 * sizeof(u8) +		/* namelen + offset */
		       namelen +			/* name */
		       (i8count ?			/* inumber */
				count * XFS_INO64_SIZE :
				count * XFS_INO32_SIZE);
		if (size > XFS_IFORK_DSIZE(dp))
			return size;		/* size value is a failure */
	}
	/*
	 * Create the output header, if it worked.
	 */
	sfhp->count = count;
	sfhp->i8count = i8count;
	xfs_dir2_sf_put_parent_ino(sfhp, parent);
	return size;
}

/*
 * Convert a block format directory to shortform.
 * Caller has already checked that it will fit, and built us a header.
 */
int						/* error */
xfs_dir2_block_to_sf(
	struct xfs_da_args	*args,		/* operation arguments */
	struct xfs_buf		*bp,
	int			size,		/* shortform directory size */
	struct xfs_dir2_sf_hdr	*sfhp)		/* shortform directory hdr */
{
	struct xfs_inode	*dp = args->dp;
	struct xfs_mount	*mp = dp->i_mount;
	int			error;		/* error return value */
	int			logflags;	/* inode logging flags */
	struct xfs_dir2_sf_entry *sfep;		/* shortform entry */
	struct xfs_dir2_sf_hdr	*sfp;		/* shortform directory header */
	unsigned int		offset = args->geo->data_entry_offset;
	unsigned int		end;

	trace_xfs_dir2_block_to_sf(args);

	/*
	 * Allocate a temporary destination buffer the size of the inode to
	 * format the data into.  Once we have formatted the data, we can free
	 * the block and copy the formatted data into the inode literal area.
	 */
	sfp = kmem_alloc(mp->m_sb.sb_inodesize, 0);
	memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));

	/*
	 * Loop over the active and unused entries.  Stop when we reach the
	 * leaf/tail portion of the block.
	 */
	end = xfs_dir3_data_end_offset(args->geo, bp->b_addr);
	sfep = xfs_dir2_sf_firstentry(sfp);
	while (offset < end) {
		struct xfs_dir2_data_unused	*dup = bp->b_addr + offset;
		struct xfs_dir2_data_entry	*dep = bp->b_addr + offset;

		/*
		 * If it's unused, just skip over it.
		 */
		if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
			offset += be16_to_cpu(dup->length);
			continue;
		}

		/*
		 * Skip .
		 */
		if (dep->namelen == 1 && dep->name[0] == '.')
			ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
		/*
		 * Skip .., but make sure the inode number is right.
		 */
		else if (dep->namelen == 2 &&
			 dep->name[0] == '.' && dep->name[1] == '.')
			ASSERT(be64_to_cpu(dep->inumber) ==
			       xfs_dir2_sf_get_parent_ino(sfp));
		/*
		 * Normal entry, copy it into shortform.
		 */
		else {
			sfep->namelen = dep->namelen;
			xfs_dir2_sf_put_offset(sfep, offset);
			memcpy(sfep->name, dep->name, dep->namelen);
			xfs_dir2_sf_put_ino(mp, sfp, sfep,
					      be64_to_cpu(dep->inumber));
			xfs_dir2_sf_put_ftype(mp, sfep,
					xfs_dir2_data_get_ftype(mp, dep));

			sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
		}
		offset += xfs_dir2_data_entsize(mp, dep->namelen);
	}
	ASSERT((char *)sfep - (char *)sfp == size);

	/* now we are done with the block, we can shrink the inode */
	logflags = XFS_ILOG_CORE;
	error = xfs_dir2_shrink_inode(args, args->geo->datablk, bp);
	if (error) {
		ASSERT(error != -ENOSPC);
		goto out;
	}

	/*
	 * The buffer is now unconditionally gone, whether
	 * xfs_dir2_shrink_inode worked or not.
	 *
	 * Convert the inode to local format and copy the data in.
	 */
	ASSERT(dp->i_df.if_bytes == 0);
	xfs_init_local_fork(dp, XFS_DATA_FORK, sfp, size);
	dp->i_df.if_format = XFS_DINODE_FMT_LOCAL;
	dp->i_d.di_size = size;

	logflags |= XFS_ILOG_DDATA;
	xfs_dir2_sf_check(args);
out:
	xfs_trans_log_inode(args->trans, dp, logflags);
	kmem_free(sfp);
	return error;
}

/*
 * Add a name to a shortform directory.
 * There are two algorithms, "easy" and "hard" which we decide on
 * before changing anything.
 * Convert to block form if necessary, if the new entry won't fit.
 */
int						/* error */
xfs_dir2_sf_addname(
	xfs_da_args_t		*args)		/* operation arguments */
{
	xfs_inode_t		*dp;		/* incore directory inode */
	int			error;		/* error return value */
	int			incr_isize;	/* total change in size */
	int			new_isize;	/* di_size after adding name */
	int			objchange;	/* changing to 8-byte inodes */
	xfs_dir2_data_aoff_t	offset = 0;	/* offset for new entry */
	int			pick;		/* which algorithm to use */
	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
	xfs_dir2_sf_entry_t	*sfep = NULL;	/* shortform entry */

	trace_xfs_dir2_sf_addname(args);

	ASSERT(xfs_dir2_sf_lookup(args) == -ENOENT);
	dp = args->dp;
	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
	ASSERT(dp->i_d.di_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
	ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
	ASSERT(dp->i_df.if_u1.if_data != NULL);
	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
	/*
	 * Compute entry (and change in) size.
	 */
	incr_isize = xfs_dir2_sf_entsize(dp->i_mount, sfp, args->namelen);
	objchange = 0;

	/*
	 * Do we have to change to 8 byte inodes?
	 */
	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
		/*
		 * Yes, adjust the inode size.  old count + (parent + new)
		 */
		incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;
		objchange = 1;
	}

	new_isize = (int)dp->i_d.di_size + incr_isize;
	/*
	 * Won't fit as shortform any more (due to size),
	 * or the pick routine says it won't (due to offset values).
	 */
	if (new_isize > XFS_IFORK_DSIZE(dp) ||
	    (pick =
	     xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
		/*
		 * Just checking or no space reservation, it doesn't fit.
		 */
		if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
			return -ENOSPC;
		/*
		 * Convert to block form then add the name.
		 */
		error = xfs_dir2_sf_to_block(args);
		if (error)
			return error;
		return xfs_dir2_block_addname(args);
	}
	/*
	 * Just checking, it fits.
	 */
	if (args->op_flags & XFS_DA_OP_JUSTCHECK)
		return 0;
	/*
	 * Do it the easy way - just add it at the end.
	 */
	if (pick == 1)
		xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
	/*
	 * Do it the hard way - look for a place to insert the new entry.
	 * Convert to 8 byte inode numbers first if necessary.
	 */
	else {
		ASSERT(pick == 2);
		if (objchange)
			xfs_dir2_sf_toino8(args);
		xfs_dir2_sf_addname_hard(args, objchange, new_isize);
	}
	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
	return 0;
}

/*
 * Add the new entry the "easy" way.
 * This is copying the old directory and adding the new entry at the end.
 * Since it's sorted by "offset" we need room after the last offset
 * that's already there, and then room to convert to a block directory.
 * This is already checked by the pick routine.
 */
static void
xfs_dir2_sf_addname_easy(
	xfs_da_args_t		*args,		/* operation arguments */
	xfs_dir2_sf_entry_t	*sfep,		/* pointer to new entry */
	xfs_dir2_data_aoff_t	offset,		/* offset to use for new ent */
	int			new_isize)	/* new directory size */
{
	struct xfs_inode	*dp = args->dp;
	struct xfs_mount	*mp = dp->i_mount;
	int			byteoff;	/* byte offset in sf dir */
	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */

	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	byteoff = (int)((char *)sfep - (char *)sfp);
	/*
	 * Grow the in-inode space.
	 */
	xfs_idata_realloc(dp, xfs_dir2_sf_entsize(mp, sfp, args->namelen),
			  XFS_DATA_FORK);
	/*
	 * Need to set up again due to realloc of the inode data.
	 */
	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
	/*
	 * Fill in the new entry.
	 */
	sfep->namelen = args->namelen;
	xfs_dir2_sf_put_offset(sfep, offset);
	memcpy(sfep->name, args->name, sfep->namelen);
	xfs_dir2_sf_put_ino(mp, sfp, sfep, args->inumber);
	xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);

	/*
	 * Update the header and inode.
	 */
	sfp->count++;
	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
		sfp->i8count++;
	dp->i_d.di_size = new_isize;
	xfs_dir2_sf_check(args);
}

/*
 * Add the new entry the "hard" way.
 * The caller has already converted to 8 byte inode numbers if necessary,
 * in which case we need to leave the i8count at 1.
 * Find a hole that the new entry will fit into, and copy
 * the first part of the entries, the new entry, and the last part of
 * the entries.
 */
/* ARGSUSED */
static void
xfs_dir2_sf_addname_hard(
	xfs_da_args_t		*args,		/* operation arguments */
	int			objchange,	/* changing inode number size */
	int			new_isize)	/* new directory size */
{
	struct xfs_inode	*dp = args->dp;
	struct xfs_mount	*mp = dp->i_mount;
	int			add_datasize;	/* data size need for new ent */
	char			*buf;		/* buffer for old */
	int			eof;		/* reached end of old dir */
	int			nbytes;		/* temp for byte copies */
	xfs_dir2_data_aoff_t	new_offset;	/* next offset value */
	xfs_dir2_data_aoff_t	offset;		/* current offset value */
	int			old_isize;	/* previous di_size */
	xfs_dir2_sf_entry_t	*oldsfep;	/* entry in original dir */
	xfs_dir2_sf_hdr_t	*oldsfp;	/* original shortform dir */
	xfs_dir2_sf_entry_t	*sfep;		/* entry in new dir */
	xfs_dir2_sf_hdr_t	*sfp;		/* new shortform dir */

	/*
	 * Copy the old directory to the stack buffer.
	 */
	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	old_isize = (int)dp->i_d.di_size;
	buf = kmem_alloc(old_isize, 0);
	oldsfp = (xfs_dir2_sf_hdr_t *)buf;
	memcpy(oldsfp, sfp, old_isize);
	/*
	 * Loop over the old directory finding the place we're going
	 * to insert the new entry.
	 * If it's going to end up at the end then oldsfep will point there.
	 */
	for (offset = args->geo->data_first_offset,
	      oldsfep = xfs_dir2_sf_firstentry(oldsfp),
	      add_datasize = xfs_dir2_data_entsize(mp, args->namelen),
	      eof = (char *)oldsfep == &buf[old_isize];
	     !eof;
	     offset = new_offset + xfs_dir2_data_entsize(mp, oldsfep->namelen),
	      oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep),
	      eof = (char *)oldsfep == &buf[old_isize]) {
		new_offset = xfs_dir2_sf_get_offset(oldsfep);
		if (offset + add_datasize <= new_offset)
			break;
	}
	/*
	 * Get rid of the old directory, then allocate space for
	 * the new one.  We do this so xfs_idata_realloc won't copy
	 * the data.
	 */
	xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
	xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
	/*
	 * Reset the pointer since the buffer was reallocated.
	 */
	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	/*
	 * Copy the first part of the directory, including the header.
	 */
	nbytes = (int)((char *)oldsfep - (char *)oldsfp);
	memcpy(sfp, oldsfp, nbytes);
	sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
	/*
	 * Fill in the new entry, and update the header counts.
	 */
	sfep->namelen = args->namelen;
	xfs_dir2_sf_put_offset(sfep, offset);
	memcpy(sfep->name, args->name, sfep->namelen);
	xfs_dir2_sf_put_ino(mp, sfp, sfep, args->inumber);
	xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);
	sfp->count++;
	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
		sfp->i8count++;
	/*
	 * If there's more left to copy, do that.
	 */
	if (!eof) {
		sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
		memcpy(sfep, oldsfep, old_isize - nbytes);
	}
	kmem_free(buf);
	dp->i_d.di_size = new_isize;
	xfs_dir2_sf_check(args);
}

/*
 * Decide if the new entry will fit at all.
 * If it will fit, pick between adding the new entry to the end (easy)
 * or somewhere else (hard).
 * Return 0 (won't fit), 1 (easy), 2 (hard).
 */
/*ARGSUSED*/
static int					/* pick result */
xfs_dir2_sf_addname_pick(
	xfs_da_args_t		*args,		/* operation arguments */
	int			objchange,	/* inode # size changes */
	xfs_dir2_sf_entry_t	**sfepp,	/* out(1): new entry ptr */
	xfs_dir2_data_aoff_t	*offsetp)	/* out(1): new offset */
{
	struct xfs_inode	*dp = args->dp;
	struct xfs_mount	*mp = dp->i_mount;
	int			holefit;	/* found hole it will fit in */
	int			i;		/* entry number */
	xfs_dir2_data_aoff_t	offset;		/* data block offset */
	xfs_dir2_sf_entry_t	*sfep;		/* shortform entry */
	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
	int			size;		/* entry's data size */
	int			used;		/* data bytes used */

	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	size = xfs_dir2_data_entsize(mp, args->namelen);
	offset = args->geo->data_first_offset;
	sfep = xfs_dir2_sf_firstentry(sfp);
	holefit = 0;
	/*
	 * Loop over sf entries.
	 * Keep track of data offset and whether we've seen a place
	 * to insert the new entry.
	 */
	for (i = 0; i < sfp->count; i++) {
		if (!holefit)
			holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
		offset = xfs_dir2_sf_get_offset(sfep) +
			 xfs_dir2_data_entsize(mp, sfep->namelen);
		sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
	}
	/*
	 * Calculate data bytes used excluding the new entry, if this
	 * was a data block (block form directory).
	 */
	used = offset +
	       (sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
	       (uint)sizeof(xfs_dir2_block_tail_t);
	/*
	 * If it won't fit in a block form then we can't insert it,
	 * we'll go back, convert to block, then try the insert and convert
	 * to leaf.
	 */
	if (used + (holefit ? 0 : size) > args->geo->blksize)
		return 0;
	/*
	 * If changing the inode number size, do it the hard way.
	 */
	if (objchange)
		return 2;
	/*
	 * If it won't fit at the end then do it the hard way (use the hole).
	 */
	if (used + size > args->geo->blksize)
		return 2;
	/*
	 * Do it the easy way.
	 */
	*sfepp = sfep;
	*offsetp = offset;
	return 1;
}

#ifdef DEBUG
/*
 * Check consistency of shortform directory, assert if bad.
 */
static void
xfs_dir2_sf_check(
	xfs_da_args_t		*args)		/* operation arguments */
{
	struct xfs_inode	*dp = args->dp;
	struct xfs_mount	*mp = dp->i_mount;
	int			i;		/* entry number */
	int			i8count;	/* number of big inode#s */
	xfs_ino_t		ino;		/* entry inode number */
	int			offset;		/* data offset */
	xfs_dir2_sf_entry_t	*sfep;		/* shortform dir entry */
	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */

	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	offset = args->geo->data_first_offset;
	ino = xfs_dir2_sf_get_parent_ino(sfp);
	i8count = ino > XFS_DIR2_MAX_SHORT_INUM;

	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
	     i < sfp->count;
	     i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {
		ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
		ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
		i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
		offset =
			xfs_dir2_sf_get_offset(sfep) +
			xfs_dir2_data_entsize(mp, sfep->namelen);
		ASSERT(xfs_dir2_sf_get_ftype(mp, sfep) < XFS_DIR3_FT_MAX);
	}
	ASSERT(i8count == sfp->i8count);
	ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
	ASSERT(offset +
	       (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
	       (uint)sizeof(xfs_dir2_block_tail_t) <= args->geo->blksize);
}
#endif	/* DEBUG */

/* Verify the consistency of an inline directory. */
xfs_failaddr_t
xfs_dir2_sf_verify(
	struct xfs_inode		*ip)
{
	struct xfs_mount		*mp = ip->i_mount;
	struct xfs_ifork		*ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
	struct xfs_dir2_sf_hdr		*sfp;
	struct xfs_dir2_sf_entry	*sfep;
	struct xfs_dir2_sf_entry	*next_sfep;
	char				*endp;
	xfs_ino_t			ino;
	int				i;
	int				i8count;
	int				offset;
	int64_t				size;
	int				error;
	uint8_t				filetype;

	ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL);

	sfp = (struct xfs_dir2_sf_hdr *)ifp->if_u1.if_data;
	size = ifp->if_bytes;

	/*
	 * Give up if the directory is way too short.
	 */
	if (size <= offsetof(struct xfs_dir2_sf_hdr, parent) ||
	    size < xfs_dir2_sf_hdr_size(sfp->i8count))
		return __this_address;

	endp = (char *)sfp + size;

	/* Check .. entry */
	ino = xfs_dir2_sf_get_parent_ino(sfp);
	i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
	error = xfs_dir_ino_validate(mp, ino);
	if (error)
		return __this_address;
	offset = mp->m_dir_geo->data_first_offset;

	/* Check all reported entries */
	sfep = xfs_dir2_sf_firstentry(sfp);
	for (i = 0; i < sfp->count; i++) {
		/*
		 * struct xfs_dir2_sf_entry has a variable length.
		 * Check the fixed-offset parts of the structure are
		 * within the data buffer.
		 */
		if (((char *)sfep + sizeof(*sfep)) >= endp)
			return __this_address;

		/* Don't allow names with known bad length. */
		if (sfep->namelen == 0)
			return __this_address;

		/*
		 * Check that the variable-length part of the structure is
		 * within the data buffer.  The next entry starts after the
		 * name component, so nextentry is an acceptable test.
		 */
		next_sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
		if (endp < (char *)next_sfep)
			return __this_address;

		/* Check that the offsets always increase. */
		if (xfs_dir2_sf_get_offset(sfep) < offset)
			return __this_address;

		/* Check the inode number. */
		ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
		i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
		error = xfs_dir_ino_validate(mp, ino);
		if (error)
			return __this_address;

		/* Check the file type. */
		filetype = xfs_dir2_sf_get_ftype(mp, sfep);
		if (filetype >= XFS_DIR3_FT_MAX)
			return __this_address;

		offset = xfs_dir2_sf_get_offset(sfep) +
				xfs_dir2_data_entsize(mp, sfep->namelen);

		sfep = next_sfep;
	}
	if (i8count != sfp->i8count)
		return __this_address;
	if ((void *)sfep != (void *)endp)
		return __this_address;

	/* Make sure this whole thing ought to be in local format. */
	if (offset + (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
	    (uint)sizeof(xfs_dir2_block_tail_t) > mp->m_dir_geo->blksize)
		return __this_address;

	return NULL;
}

/*
 * Create a new (shortform) directory.
 */
int					/* error, always 0 */
xfs_dir2_sf_create(
	xfs_da_args_t	*args,		/* operation arguments */
	xfs_ino_t	pino)		/* parent inode number */
{
	xfs_inode_t	*dp;		/* incore directory inode */
	int		i8count;	/* parent inode is an 8-byte number */
	xfs_dir2_sf_hdr_t *sfp;		/* shortform structure */
	int		size;		/* directory size */

	trace_xfs_dir2_sf_create(args);

	dp = args->dp;

	ASSERT(dp != NULL);
	ASSERT(dp->i_d.di_size == 0);
	/*
	 * If it's currently a zero-length extent file,
	 * convert it to local format.
	 */
	if (dp->i_df.if_format == XFS_DINODE_FMT_EXTENTS) {
		dp->i_df.if_flags &= ~XFS_IFEXTENTS;	/* just in case */
		dp->i_df.if_format = XFS_DINODE_FMT_LOCAL;
		xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
		dp->i_df.if_flags |= XFS_IFINLINE;
	}
	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
	ASSERT(dp->i_df.if_bytes == 0);
	i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
	size = xfs_dir2_sf_hdr_size(i8count);
	/*
	 * Make a buffer for the data.
	 */
	xfs_idata_realloc(dp, size, XFS_DATA_FORK);
	/*
	 * Fill in the header,
	 */
	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	sfp->i8count = i8count;
	/*
	 * Now can put in the inode number, since i8count is set.
	 */
	xfs_dir2_sf_put_parent_ino(sfp, pino);
	sfp->count = 0;
	dp->i_d.di_size = size;
	xfs_dir2_sf_check(args);
	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
	return 0;
}

/*
 * Lookup an entry in a shortform directory.
 * Returns EEXIST if found, ENOENT if not found.
 */
int						/* error */
xfs_dir2_sf_lookup(
	xfs_da_args_t		*args)		/* operation arguments */
{
	struct xfs_inode	*dp = args->dp;
	struct xfs_mount	*mp = dp->i_mount;
	int			i;		/* entry index */
	int			error;
	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
	enum xfs_dacmp		cmp;		/* comparison result */
	xfs_dir2_sf_entry_t	*ci_sfep;	/* case-insens. entry */

	trace_xfs_dir2_sf_lookup(args);

	xfs_dir2_sf_check(args);

	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
	ASSERT(dp->i_d.di_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
	ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
	ASSERT(dp->i_df.if_u1.if_data != NULL);
	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
	/*
	 * Special case for .
	 */
	if (args->namelen == 1 && args->name[0] == '.') {
		args->inumber = dp->i_ino;
		args->cmpresult = XFS_CMP_EXACT;
		args->filetype = XFS_DIR3_FT_DIR;
		return -EEXIST;
	}
	/*
	 * Special case for ..
	 */
	if (args->namelen == 2 &&
	    args->name[0] == '.' && args->name[1] == '.') {
		args->inumber = xfs_dir2_sf_get_parent_ino(sfp);
		args->cmpresult = XFS_CMP_EXACT;
		args->filetype = XFS_DIR3_FT_DIR;
		return -EEXIST;
	}
	/*
	 * Loop over all the entries trying to match ours.
	 */
	ci_sfep = NULL;
	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
	     i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {
		/*
		 * Compare name and if it's an exact match, return the inode
		 * number. If it's the first case-insensitive match, store the
		 * inode number and continue looking for an exact match.
		 */
		cmp = xfs_dir2_compname(args, sfep->name, sfep->namelen);
		if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
			args->cmpresult = cmp;
			args->inumber = xfs_dir2_sf_get_ino(mp, sfp, sfep);
			args->filetype = xfs_dir2_sf_get_ftype(mp, sfep);
			if (cmp == XFS_CMP_EXACT)
				return -EEXIST;
			ci_sfep = sfep;
		}
	}
	ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
	/*
	 * Here, we can only be doing a lookup (not a rename or replace).
	 * If a case-insensitive match was not found, return -ENOENT.
	 */
	if (!ci_sfep)
		return -ENOENT;
	/* otherwise process the CI match as required by the caller */
	error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
	return error;
}

/*
 * Remove an entry from a shortform directory.
 */
int						/* error */
xfs_dir2_sf_removename(
	xfs_da_args_t		*args)
{
	struct xfs_inode	*dp = args->dp;
	struct xfs_mount	*mp = dp->i_mount;
	int			byteoff;	/* offset of removed entry */
	int			entsize;	/* this entry's size */
	int			i;		/* shortform entry index */
	int			newsize;	/* new inode size */
	int			oldsize;	/* old inode size */
	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */

	trace_xfs_dir2_sf_removename(args);

	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
	oldsize = (int)dp->i_d.di_size;
	ASSERT(oldsize >= offsetof(struct xfs_dir2_sf_hdr, parent));
	ASSERT(dp->i_df.if_bytes == oldsize);
	ASSERT(dp->i_df.if_u1.if_data != NULL);
	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
	/*
	 * Loop over the old directory entries.
	 * Find the one we're deleting.
	 */
	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
	     i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {
		if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
								XFS_CMP_EXACT) {
			ASSERT(xfs_dir2_sf_get_ino(mp, sfp, sfep) ==
			       args->inumber);
			break;
		}
	}
	/*
	 * Didn't find it.
	 */
	if (i == sfp->count)
		return -ENOENT;
	/*
	 * Calculate sizes.
	 */
	byteoff = (int)((char *)sfep - (char *)sfp);
	entsize = xfs_dir2_sf_entsize(mp, sfp, args->namelen);
	newsize = oldsize - entsize;
	/*
	 * Copy the part if any after the removed entry, sliding it down.
	 */
	if (byteoff + entsize < oldsize)
		memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
			oldsize - (byteoff + entsize));
	/*
	 * Fix up the header and file size.
	 */
	sfp->count--;
	dp->i_d.di_size = newsize;
	/*
	 * Reallocate, making it smaller.
	 */
	xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	/*
	 * Are we changing inode number size?
	 */
	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
		if (sfp->i8count == 1)
			xfs_dir2_sf_toino4(args);
		else
			sfp->i8count--;
	}
	xfs_dir2_sf_check(args);
	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
	return 0;
}

/*
 * Check whether the sf dir replace operation need more blocks.
 */
bool
xfs_dir2_sf_replace_needblock(
	struct xfs_inode	*dp,
	xfs_ino_t		inum)
{
	int			newsize;
	struct xfs_dir2_sf_hdr	*sfp;

	if (dp->i_df.if_format != XFS_DINODE_FMT_LOCAL)
		return false;

	sfp = (struct xfs_dir2_sf_hdr *)dp->i_df.if_u1.if_data;
	newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;

	return inum > XFS_DIR2_MAX_SHORT_INUM &&
	       sfp->i8count == 0 && newsize > XFS_IFORK_DSIZE(dp);
}

/*
 * Replace the inode number of an entry in a shortform directory.
 */
int						/* error */
xfs_dir2_sf_replace(
	xfs_da_args_t		*args)		/* operation arguments */
{
	struct xfs_inode	*dp = args->dp;
	struct xfs_mount	*mp = dp->i_mount;
	int			i;		/* entry index */
	xfs_ino_t		ino=0;		/* entry old inode number */
	int			i8elevated;	/* sf_toino8 set i8count=1 */
	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */

	trace_xfs_dir2_sf_replace(args);

	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
	ASSERT(dp->i_d.di_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
	ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
	ASSERT(dp->i_df.if_u1.if_data != NULL);
	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));

	/*
	 * New inode number is large, and need to convert to 8-byte inodes.
	 */
	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
		int	error;			/* error return value */

		/*
		 * Won't fit as shortform, convert to block then do replace.
		 */
		if (xfs_dir2_sf_replace_needblock(dp, args->inumber)) {
			error = xfs_dir2_sf_to_block(args);
			if (error)
				return error;
			return xfs_dir2_block_replace(args);
		}
		/*
		 * Still fits, convert to 8-byte now.
		 */
		xfs_dir2_sf_toino8(args);
		i8elevated = 1;
		sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	} else
		i8elevated = 0;

	ASSERT(args->namelen != 1 || args->name[0] != '.');
	/*
	 * Replace ..'s entry.
	 */
	if (args->namelen == 2 &&
	    args->name[0] == '.' && args->name[1] == '.') {
		ino = xfs_dir2_sf_get_parent_ino(sfp);
		ASSERT(args->inumber != ino);
		xfs_dir2_sf_put_parent_ino(sfp, args->inumber);
	}
	/*
	 * Normal entry, look for the name.
	 */
	else {
		for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
		     i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {
			if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
								XFS_CMP_EXACT) {
				ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
				ASSERT(args->inumber != ino);
				xfs_dir2_sf_put_ino(mp, sfp, sfep,
						args->inumber);
				xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);
				break;
			}
		}
		/*
		 * Didn't find it.
		 */
		if (i == sfp->count) {
			ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
			if (i8elevated)
				xfs_dir2_sf_toino4(args);
			return -ENOENT;
		}
	}
	/*
	 * See if the old number was large, the new number is small.
	 */
	if (ino > XFS_DIR2_MAX_SHORT_INUM &&
	    args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
		/*
		 * And the old count was one, so need to convert to small.
		 */
		if (sfp->i8count == 1)
			xfs_dir2_sf_toino4(args);
		else
			sfp->i8count--;
	}
	/*
	 * See if the old number was small, the new number is large.
	 */
	if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
	    args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
		/*
		 * add to the i8count unless we just converted to 8-byte
		 * inodes (which does an implied i8count = 1)
		 */
		ASSERT(sfp->i8count != 0);
		if (!i8elevated)
			sfp->i8count++;
	}
	xfs_dir2_sf_check(args);
	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
	return 0;
}

/*
 * Convert from 8-byte inode numbers to 4-byte inode numbers.
 * The last 8-byte inode number is gone, but the count is still 1.
 */
static void
xfs_dir2_sf_toino4(
	xfs_da_args_t		*args)		/* operation arguments */
{
	struct xfs_inode	*dp = args->dp;
	struct xfs_mount	*mp = dp->i_mount;
	char			*buf;		/* old dir's buffer */
	int			i;		/* entry index */
	int			newsize;	/* new inode size */
	xfs_dir2_sf_entry_t	*oldsfep;	/* old sf entry */
	xfs_dir2_sf_hdr_t	*oldsfp;	/* old sf directory */
	int			oldsize;	/* old inode size */
	xfs_dir2_sf_entry_t	*sfep;		/* new sf entry */
	xfs_dir2_sf_hdr_t	*sfp;		/* new sf directory */

	trace_xfs_dir2_sf_toino4(args);

	/*
	 * Copy the old directory to the buffer.
	 * Then nuke it from the inode, and add the new buffer to the inode.
	 * Don't want xfs_idata_realloc copying the data here.
	 */
	oldsize = dp->i_df.if_bytes;
	buf = kmem_alloc(oldsize, 0);
	oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	ASSERT(oldsfp->i8count == 1);
	memcpy(buf, oldsfp, oldsize);
	/*
	 * Compute the new inode size.
	 */
	newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;
	xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
	xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
	/*
	 * Reset our pointers, the data has moved.
	 */
	oldsfp = (xfs_dir2_sf_hdr_t *)buf;
	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	/*
	 * Fill in the new header.
	 */
	sfp->count = oldsfp->count;
	sfp->i8count = 0;
	xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
	/*
	 * Copy the entries field by field.
	 */
	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
		    oldsfep = xfs_dir2_sf_firstentry(oldsfp);
	     i < sfp->count;
	     i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep),
		  oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep)) {
		sfep->namelen = oldsfep->namelen;
		memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
		memcpy(sfep->name, oldsfep->name, sfep->namelen);
		xfs_dir2_sf_put_ino(mp, sfp, sfep,
				xfs_dir2_sf_get_ino(mp, oldsfp, oldsfep));
		xfs_dir2_sf_put_ftype(mp, sfep,
				xfs_dir2_sf_get_ftype(mp, oldsfep));
	}
	/*
	 * Clean up the inode.
	 */
	kmem_free(buf);
	dp->i_d.di_size = newsize;
	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
}

/*
 * Convert existing entries from 4-byte inode numbers to 8-byte inode numbers.
 * The new entry w/ an 8-byte inode number is not there yet; we leave with
 * i8count set to 1, but no corresponding 8-byte entry.
 */
static void
xfs_dir2_sf_toino8(
	xfs_da_args_t		*args)		/* operation arguments */
{
	struct xfs_inode	*dp = args->dp;
	struct xfs_mount	*mp = dp->i_mount;
	char			*buf;		/* old dir's buffer */
	int			i;		/* entry index */
	int			newsize;	/* new inode size */
	xfs_dir2_sf_entry_t	*oldsfep;	/* old sf entry */
	xfs_dir2_sf_hdr_t	*oldsfp;	/* old sf directory */
	int			oldsize;	/* old inode size */
	xfs_dir2_sf_entry_t	*sfep;		/* new sf entry */
	xfs_dir2_sf_hdr_t	*sfp;		/* new sf directory */

	trace_xfs_dir2_sf_toino8(args);

	/*
	 * Copy the old directory to the buffer.
	 * Then nuke it from the inode, and add the new buffer to the inode.
	 * Don't want xfs_idata_realloc copying the data here.
	 */
	oldsize = dp->i_df.if_bytes;
	buf = kmem_alloc(oldsize, 0);
	oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	ASSERT(oldsfp->i8count == 0);
	memcpy(buf, oldsfp, oldsize);
	/*
	 * Compute the new inode size (nb: entry count + 1 for parent)
	 */
	newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;
	xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
	xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
	/*
	 * Reset our pointers, the data has moved.
	 */
	oldsfp = (xfs_dir2_sf_hdr_t *)buf;
	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
	/*
	 * Fill in the new header.
	 */
	sfp->count = oldsfp->count;
	sfp->i8count = 1;
	xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
	/*
	 * Copy the entries field by field.
	 */
	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
		    oldsfep = xfs_dir2_sf_firstentry(oldsfp);
	     i < sfp->count;
	     i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep),
		  oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep)) {
		sfep->namelen = oldsfep->namelen;
		memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
		memcpy(sfep->name, oldsfep->name, sfep->namelen);
		xfs_dir2_sf_put_ino(mp, sfp, sfep,
				xfs_dir2_sf_get_ino(mp, oldsfp, oldsfep));
		xfs_dir2_sf_put_ftype(mp, sfep,
				xfs_dir2_sf_get_ftype(mp, oldsfep));
	}
	/*
	 * Clean up the inode.
	 */
	kmem_free(buf);
	dp->i_d.di_size = newsize;
	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
}