summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_trans.c
blob: 3db0e22007759c076b0ed561270203af3dedd026 (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
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
/*
 * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 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.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

#include "xfs.h"
#include "xfs_macros.h"
#include "xfs_types.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_error.h"
#include "xfs_trans_priv.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_alloc.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_da_btree.h"
#include "xfs_quota.h"
#include "xfs_trans_space.h"


STATIC void	xfs_trans_apply_sb_deltas(xfs_trans_t *);
STATIC uint	xfs_trans_count_vecs(xfs_trans_t *);
STATIC void	xfs_trans_fill_vecs(xfs_trans_t *, xfs_log_iovec_t *);
STATIC void	xfs_trans_uncommit(xfs_trans_t *, uint);
STATIC void	xfs_trans_committed(xfs_trans_t *, int);
STATIC void	xfs_trans_chunk_committed(xfs_log_item_chunk_t *, xfs_lsn_t, int);
STATIC void	xfs_trans_free(xfs_trans_t *);

kmem_zone_t		*xfs_trans_zone;


/*
 * Initialize the precomputed transaction reservation values
 * in the mount structure.
 */
void
xfs_trans_init(
	xfs_mount_t	*mp)
{
	xfs_trans_reservations_t	*resp;

	resp = &(mp->m_reservations);
	resp->tr_write =
		(uint)(XFS_CALC_WRITE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_itruncate =
		(uint)(XFS_CALC_ITRUNCATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_rename =
		(uint)(XFS_CALC_RENAME_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_link = (uint)XFS_CALC_LINK_LOG_RES(mp);
	resp->tr_remove =
		(uint)(XFS_CALC_REMOVE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_symlink =
		(uint)(XFS_CALC_SYMLINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_create =
		(uint)(XFS_CALC_CREATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_mkdir =
		(uint)(XFS_CALC_MKDIR_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_ifree =
		(uint)(XFS_CALC_IFREE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_ichange =
		(uint)(XFS_CALC_ICHANGE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_growdata = (uint)XFS_CALC_GROWDATA_LOG_RES(mp);
	resp->tr_swrite = (uint)XFS_CALC_SWRITE_LOG_RES(mp);
	resp->tr_writeid = (uint)XFS_CALC_WRITEID_LOG_RES(mp);
	resp->tr_addafork =
		(uint)(XFS_CALC_ADDAFORK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_attrinval = (uint)XFS_CALC_ATTRINVAL_LOG_RES(mp);
	resp->tr_attrset =
		(uint)(XFS_CALC_ATTRSET_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_attrrm =
		(uint)(XFS_CALC_ATTRRM_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp));
	resp->tr_clearagi = (uint)XFS_CALC_CLEAR_AGI_BUCKET_LOG_RES(mp);
	resp->tr_growrtalloc = (uint)XFS_CALC_GROWRTALLOC_LOG_RES(mp);
	resp->tr_growrtzero = (uint)XFS_CALC_GROWRTZERO_LOG_RES(mp);
	resp->tr_growrtfree = (uint)XFS_CALC_GROWRTFREE_LOG_RES(mp);
}

/*
 * This routine is called to allocate a transaction structure.
 * The type parameter indicates the type of the transaction.  These
 * are enumerated in xfs_trans.h.
 *
 * Dynamically allocate the transaction structure from the transaction
 * zone, initialize it, and return it to the caller.
 */
xfs_trans_t *
xfs_trans_alloc(
	xfs_mount_t	*mp,
	uint		type)
{
	fs_check_frozen(XFS_MTOVFS(mp), SB_FREEZE_TRANS);
	atomic_inc(&mp->m_active_trans);

	return (_xfs_trans_alloc(mp, type));

}

xfs_trans_t *
_xfs_trans_alloc(
	xfs_mount_t	*mp,
	uint		type)
{
	xfs_trans_t	*tp;

	ASSERT(xfs_trans_zone != NULL);
	tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);

	/*
	 * Initialize the transaction structure.
	 */
	tp->t_magic = XFS_TRANS_MAGIC;
	tp->t_type = type;
	tp->t_mountp = mp;
	tp->t_items_free = XFS_LIC_NUM_SLOTS;
	tp->t_busy_free = XFS_LBC_NUM_SLOTS;
	XFS_LIC_INIT(&(tp->t_items));
	XFS_LBC_INIT(&(tp->t_busy));

	return (tp);
}

/*
 * This is called to create a new transaction which will share the
 * permanent log reservation of the given transaction.  The remaining
 * unused block and rt extent reservations are also inherited.  This
 * implies that the original transaction is no longer allowed to allocate
 * blocks.  Locks and log items, however, are no inherited.  They must
 * be added to the new transaction explicitly.
 */
xfs_trans_t *
xfs_trans_dup(
	xfs_trans_t	*tp)
{
	xfs_trans_t	*ntp;

	ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);

	/*
	 * Initialize the new transaction structure.
	 */
	ntp->t_magic = XFS_TRANS_MAGIC;
	ntp->t_type = tp->t_type;
	ntp->t_mountp = tp->t_mountp;
	ntp->t_items_free = XFS_LIC_NUM_SLOTS;
	ntp->t_busy_free = XFS_LBC_NUM_SLOTS;
	XFS_LIC_INIT(&(ntp->t_items));
	XFS_LBC_INIT(&(ntp->t_busy));

	ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);

#if defined(XLOG_NOLOG) || defined(DEBUG)
	ASSERT(!xlog_debug || tp->t_ticket != NULL);
#else
	ASSERT(tp->t_ticket != NULL);
#endif
	ntp->t_flags = XFS_TRANS_PERM_LOG_RES | (tp->t_flags & XFS_TRANS_RESERVE);
	ntp->t_ticket = tp->t_ticket;
	ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
	tp->t_blk_res = tp->t_blk_res_used;
	ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
	tp->t_rtx_res = tp->t_rtx_res_used;
	PFLAGS_DUP(&tp->t_pflags, &ntp->t_pflags);

	XFS_TRANS_DUP_DQINFO(tp->t_mountp, tp, ntp);

	atomic_inc(&tp->t_mountp->m_active_trans);
	return ntp;
}

/*
 * This is called to reserve free disk blocks and log space for the
 * given transaction.  This must be done before allocating any resources
 * within the transaction.
 *
 * This will return ENOSPC if there are not enough blocks available.
 * It will sleep waiting for available log space.
 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
 * is used by long running transactions.  If any one of the reservations
 * fails then they will all be backed out.
 *
 * This does not do quota reservations. That typically is done by the
 * caller afterwards.
 */
int
xfs_trans_reserve(
	xfs_trans_t	*tp,
	uint		blocks,
	uint		logspace,
	uint		rtextents,
	uint		flags,
	uint		logcount)
{
	int		log_flags;
	int		error;
	int	rsvd;

	error = 0;
	rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;

	/* Mark this thread as being in a transaction */
        PFLAGS_SET_FSTRANS(&tp->t_pflags);

	/*
	 * Attempt to reserve the needed disk blocks by decrementing
	 * the number needed from the number available.  This will
	 * fail if the count would go below zero.
	 */
	if (blocks > 0) {
		error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS,
					  -blocks, rsvd);
		if (error != 0) {
                        PFLAGS_RESTORE_FSTRANS(&tp->t_pflags);
			return (XFS_ERROR(ENOSPC));
		}
		tp->t_blk_res += blocks;
	}

	/*
	 * Reserve the log space needed for this transaction.
	 */
	if (logspace > 0) {
		ASSERT((tp->t_log_res == 0) || (tp->t_log_res == logspace));
		ASSERT((tp->t_log_count == 0) ||
			(tp->t_log_count == logcount));
		if (flags & XFS_TRANS_PERM_LOG_RES) {
			log_flags = XFS_LOG_PERM_RESERV;
			tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
		} else {
			ASSERT(tp->t_ticket == NULL);
			ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
			log_flags = 0;
		}

		error = xfs_log_reserve(tp->t_mountp, logspace, logcount,
					&tp->t_ticket,
					XFS_TRANSACTION, log_flags);
		if (error) {
			goto undo_blocks;
		}
		tp->t_log_res = logspace;
		tp->t_log_count = logcount;
	}

	/*
	 * Attempt to reserve the needed realtime extents by decrementing
	 * the number needed from the number available.  This will
	 * fail if the count would go below zero.
	 */
	if (rtextents > 0) {
		error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS,
					  -rtextents, rsvd);
		if (error) {
			error = XFS_ERROR(ENOSPC);
			goto undo_log;
		}
		tp->t_rtx_res += rtextents;
	}

	return 0;

	/*
	 * Error cases jump to one of these labels to undo any
	 * reservations which have already been performed.
	 */
undo_log:
	if (logspace > 0) {
		if (flags & XFS_TRANS_PERM_LOG_RES) {
			log_flags = XFS_LOG_REL_PERM_RESERV;
		} else {
			log_flags = 0;
		}
		xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags);
		tp->t_ticket = NULL;
		tp->t_log_res = 0;
		tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
	}

undo_blocks:
	if (blocks > 0) {
		(void) xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS,
					 blocks, rsvd);
		tp->t_blk_res = 0;
	}

        PFLAGS_RESTORE_FSTRANS(&tp->t_pflags);

	return (error);
}


/*
 * This is called to set the a callback to be called when the given
 * transaction is committed to disk.  The transaction pointer and the
 * argument pointer will be passed to the callback routine.
 *
 * Only one callback can be associated with any single transaction.
 */
void
xfs_trans_callback(
	xfs_trans_t		*tp,
	xfs_trans_callback_t	callback,
	void			*arg)
{
	ASSERT(tp->t_callback == NULL);
	tp->t_callback = callback;
	tp->t_callarg = arg;
}


/*
 * Record the indicated change to the given field for application
 * to the file system's superblock when the transaction commits.
 * For now, just store the change in the transaction structure.
 *
 * Mark the transaction structure to indicate that the superblock
 * needs to be updated before committing.
 */
void
xfs_trans_mod_sb(
	xfs_trans_t	*tp,
	uint		field,
	long		delta)
{

	switch (field) {
	case XFS_TRANS_SB_ICOUNT:
		tp->t_icount_delta += delta;
		break;
	case XFS_TRANS_SB_IFREE:
		tp->t_ifree_delta += delta;
		break;
	case XFS_TRANS_SB_FDBLOCKS:
		/*
		 * Track the number of blocks allocated in the
		 * transaction.  Make sure it does not exceed the
		 * number reserved.
		 */
		if (delta < 0) {
			tp->t_blk_res_used += (uint)-delta;
			ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
		}
		tp->t_fdblocks_delta += delta;
		break;
	case XFS_TRANS_SB_RES_FDBLOCKS:
		/*
		 * The allocation has already been applied to the
		 * in-core superblock's counter.  This should only
		 * be applied to the on-disk superblock.
		 */
		ASSERT(delta < 0);
		tp->t_res_fdblocks_delta += delta;
		break;
	case XFS_TRANS_SB_FREXTENTS:
		/*
		 * Track the number of blocks allocated in the
		 * transaction.  Make sure it does not exceed the
		 * number reserved.
		 */
		if (delta < 0) {
			tp->t_rtx_res_used += (uint)-delta;
			ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
		}
		tp->t_frextents_delta += delta;
		break;
	case XFS_TRANS_SB_RES_FREXTENTS:
		/*
		 * The allocation has already been applied to the
		 * in-core superblocks's counter.  This should only
		 * be applied to the on-disk superblock.
		 */
		ASSERT(delta < 0);
		tp->t_res_frextents_delta += delta;
		break;
	case XFS_TRANS_SB_DBLOCKS:
		ASSERT(delta > 0);
		tp->t_dblocks_delta += delta;
		break;
	case XFS_TRANS_SB_AGCOUNT:
		ASSERT(delta > 0);
		tp->t_agcount_delta += delta;
		break;
	case XFS_TRANS_SB_IMAXPCT:
		tp->t_imaxpct_delta += delta;
		break;
	case XFS_TRANS_SB_REXTSIZE:
		tp->t_rextsize_delta += delta;
		break;
	case XFS_TRANS_SB_RBMBLOCKS:
		tp->t_rbmblocks_delta += delta;
		break;
	case XFS_TRANS_SB_RBLOCKS:
		tp->t_rblocks_delta += delta;
		break;
	case XFS_TRANS_SB_REXTENTS:
		tp->t_rextents_delta += delta;
		break;
	case XFS_TRANS_SB_REXTSLOG:
		tp->t_rextslog_delta += delta;
		break;
	default:
		ASSERT(0);
		return;
	}

	tp->t_flags |= (XFS_TRANS_SB_DIRTY | XFS_TRANS_DIRTY);
}

/*
 * xfs_trans_apply_sb_deltas() is called from the commit code
 * to bring the superblock buffer into the current transaction
 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
 *
 * For now we just look at each field allowed to change and change
 * it if necessary.
 */
STATIC void
xfs_trans_apply_sb_deltas(
	xfs_trans_t	*tp)
{
	xfs_sb_t	*sbp;
	xfs_buf_t	*bp;
	int		whole = 0;

	bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
	sbp = XFS_BUF_TO_SBP(bp);

	/*
	 * Check that superblock mods match the mods made to AGF counters.
	 */
	ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
	       (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
		tp->t_ag_btree_delta));

	if (tp->t_icount_delta != 0) {
		INT_MOD(sbp->sb_icount, ARCH_CONVERT, tp->t_icount_delta);
	}
	if (tp->t_ifree_delta != 0) {
		INT_MOD(sbp->sb_ifree, ARCH_CONVERT, tp->t_ifree_delta);
	}

	if (tp->t_fdblocks_delta != 0) {
		INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_fdblocks_delta);
	}
	if (tp->t_res_fdblocks_delta != 0) {
		INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_res_fdblocks_delta);
	}

	if (tp->t_frextents_delta != 0) {
		INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_frextents_delta);
	}
	if (tp->t_res_frextents_delta != 0) {
		INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_res_frextents_delta);
	}
	if (tp->t_dblocks_delta != 0) {
		INT_MOD(sbp->sb_dblocks, ARCH_CONVERT, tp->t_dblocks_delta);
		whole = 1;
	}
	if (tp->t_agcount_delta != 0) {
		INT_MOD(sbp->sb_agcount, ARCH_CONVERT, tp->t_agcount_delta);
		whole = 1;
	}
	if (tp->t_imaxpct_delta != 0) {
		INT_MOD(sbp->sb_imax_pct, ARCH_CONVERT, tp->t_imaxpct_delta);
		whole = 1;
	}
	if (tp->t_rextsize_delta != 0) {
		INT_MOD(sbp->sb_rextsize, ARCH_CONVERT, tp->t_rextsize_delta);
		whole = 1;
	}
	if (tp->t_rbmblocks_delta != 0) {
		INT_MOD(sbp->sb_rbmblocks, ARCH_CONVERT, tp->t_rbmblocks_delta);
		whole = 1;
	}
	if (tp->t_rblocks_delta != 0) {
		INT_MOD(sbp->sb_rblocks, ARCH_CONVERT, tp->t_rblocks_delta);
		whole = 1;
	}
	if (tp->t_rextents_delta != 0) {
		INT_MOD(sbp->sb_rextents, ARCH_CONVERT, tp->t_rextents_delta);
		whole = 1;
	}
	if (tp->t_rextslog_delta != 0) {
		INT_MOD(sbp->sb_rextslog, ARCH_CONVERT, tp->t_rextslog_delta);
		whole = 1;
	}

	if (whole)
		/*
		 * Log the whole thing, the fields are discontiguous.
		 */
		xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_sb_t) - 1);
	else
		/*
		 * Since all the modifiable fields are contiguous, we
		 * can get away with this.
		 */
		xfs_trans_log_buf(tp, bp, offsetof(xfs_sb_t, sb_icount),
				  offsetof(xfs_sb_t, sb_frextents) +
				  sizeof(sbp->sb_frextents) - 1);

	XFS_MTOVFS(tp->t_mountp)->vfs_super->s_dirt = 1;
}

/*
 * xfs_trans_unreserve_and_mod_sb() is called to release unused
 * reservations and apply superblock counter changes to the in-core
 * superblock.
 *
 * This is done efficiently with a single call to xfs_mod_incore_sb_batch().
 */
void
xfs_trans_unreserve_and_mod_sb(
	xfs_trans_t	*tp)
{
	xfs_mod_sb_t	msb[14];	/* If you add cases, add entries */
	xfs_mod_sb_t	*msbp;
	/* REFERENCED */
	int		error;
	int		rsvd;

	msbp = msb;
	rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;

	/*
	 * Release any reserved blocks.  Any that were allocated
	 * will be taken back again by fdblocks_delta below.
	 */
	if (tp->t_blk_res > 0) {
		msbp->msb_field = XFS_SBS_FDBLOCKS;
		msbp->msb_delta = tp->t_blk_res;
		msbp++;
	}

	/*
	 * Release any reserved real time extents .  Any that were
	 * allocated will be taken back again by frextents_delta below.
	 */
	if (tp->t_rtx_res > 0) {
		msbp->msb_field = XFS_SBS_FREXTENTS;
		msbp->msb_delta = tp->t_rtx_res;
		msbp++;
	}

	/*
	 * Apply any superblock modifications to the in-core version.
	 * The t_res_fdblocks_delta and t_res_frextents_delta fields are
	 * explicity NOT applied to the in-core superblock.
	 * The idea is that that has already been done.
	 */
	if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
		if (tp->t_icount_delta != 0) {
			msbp->msb_field = XFS_SBS_ICOUNT;
			msbp->msb_delta = (int)tp->t_icount_delta;
			msbp++;
		}
		if (tp->t_ifree_delta != 0) {
			msbp->msb_field = XFS_SBS_IFREE;
			msbp->msb_delta = (int)tp->t_ifree_delta;
			msbp++;
		}
		if (tp->t_fdblocks_delta != 0) {
			msbp->msb_field = XFS_SBS_FDBLOCKS;
			msbp->msb_delta = (int)tp->t_fdblocks_delta;
			msbp++;
		}
		if (tp->t_frextents_delta != 0) {
			msbp->msb_field = XFS_SBS_FREXTENTS;
			msbp->msb_delta = (int)tp->t_frextents_delta;
			msbp++;
		}
		if (tp->t_dblocks_delta != 0) {
			msbp->msb_field = XFS_SBS_DBLOCKS;
			msbp->msb_delta = (int)tp->t_dblocks_delta;
			msbp++;
		}
		if (tp->t_agcount_delta != 0) {
			msbp->msb_field = XFS_SBS_AGCOUNT;
			msbp->msb_delta = (int)tp->t_agcount_delta;
			msbp++;
		}
		if (tp->t_imaxpct_delta != 0) {
			msbp->msb_field = XFS_SBS_IMAX_PCT;
			msbp->msb_delta = (int)tp->t_imaxpct_delta;
			msbp++;
		}
		if (tp->t_rextsize_delta != 0) {
			msbp->msb_field = XFS_SBS_REXTSIZE;
			msbp->msb_delta = (int)tp->t_rextsize_delta;
			msbp++;
		}
		if (tp->t_rbmblocks_delta != 0) {
			msbp->msb_field = XFS_SBS_RBMBLOCKS;
			msbp->msb_delta = (int)tp->t_rbmblocks_delta;
			msbp++;
		}
		if (tp->t_rblocks_delta != 0) {
			msbp->msb_field = XFS_SBS_RBLOCKS;
			msbp->msb_delta = (int)tp->t_rblocks_delta;
			msbp++;
		}
		if (tp->t_rextents_delta != 0) {
			msbp->msb_field = XFS_SBS_REXTENTS;
			msbp->msb_delta = (int)tp->t_rextents_delta;
			msbp++;
		}
		if (tp->t_rextslog_delta != 0) {
			msbp->msb_field = XFS_SBS_REXTSLOG;
			msbp->msb_delta = (int)tp->t_rextslog_delta;
			msbp++;
		}
	}

	/*
	 * If we need to change anything, do it.
	 */
	if (msbp > msb) {
		error = xfs_mod_incore_sb_batch(tp->t_mountp, msb,
			(uint)(msbp - msb), rsvd);
		ASSERT(error == 0);
	}
}


/*
 * xfs_trans_commit
 *
 * Commit the given transaction to the log a/synchronously.
 *
 * XFS disk error handling mechanism is not based on a typical
 * transaction abort mechanism. Logically after the filesystem
 * gets marked 'SHUTDOWN', we can't let any new transactions
 * be durable - ie. committed to disk - because some metadata might
 * be inconsistent. In such cases, this returns an error, and the
 * caller may assume that all locked objects joined to the transaction
 * have already been unlocked as if the commit had succeeded.
 * Do not reference the transaction structure after this call.
 */
 /*ARGSUSED*/
int
xfs_trans_commit(
	xfs_trans_t	*tp,
	uint		flags,
	xfs_lsn_t	*commit_lsn_p)
{
	xfs_log_iovec_t		*log_vector;
	int			nvec;
	xfs_mount_t		*mp;
	xfs_lsn_t		commit_lsn;
	/* REFERENCED */
	int			error;
	int			log_flags;
	int			sync;
#define	XFS_TRANS_LOGVEC_COUNT	16
	xfs_log_iovec_t		log_vector_fast[XFS_TRANS_LOGVEC_COUNT];
#if defined(XLOG_NOLOG) || defined(DEBUG)
	static xfs_lsn_t	trans_lsn = 1;
#endif
	void			*commit_iclog;
	int			shutdown;

	commit_lsn = -1;

	/*
	 * Determine whether this commit is releasing a permanent
	 * log reservation or not.
	 */
	if (flags & XFS_TRANS_RELEASE_LOG_RES) {
		ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
		log_flags = XFS_LOG_REL_PERM_RESERV;
	} else {
		log_flags = 0;
	}
	mp = tp->t_mountp;

	/*
	 * If there is nothing to be logged by the transaction,
	 * then unlock all of the items associated with the
	 * transaction and free the transaction structure.
	 * Also make sure to return any reserved blocks to
	 * the free pool.
	 */
shut_us_down:
	shutdown = XFS_FORCED_SHUTDOWN(mp) ? EIO : 0;
	if (!(tp->t_flags & XFS_TRANS_DIRTY) || shutdown) {
		xfs_trans_unreserve_and_mod_sb(tp);
		/*
		 * It is indeed possible for the transaction to be
		 * not dirty but the dqinfo portion to be. All that
		 * means is that we have some (non-persistent) quota
		 * reservations that need to be unreserved.
		 */
		XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp);
		if (tp->t_ticket) {
			commit_lsn = xfs_log_done(mp, tp->t_ticket,
							NULL, log_flags);
			if (commit_lsn == -1 && !shutdown)
				shutdown = XFS_ERROR(EIO);
		}
                PFLAGS_RESTORE_FSTRANS(&tp->t_pflags);
		xfs_trans_free_items(tp, shutdown? XFS_TRANS_ABORT : 0);
		xfs_trans_free_busy(tp);
		xfs_trans_free(tp);
		XFS_STATS_INC(xs_trans_empty);
		if (commit_lsn_p)
			*commit_lsn_p = commit_lsn;
		return (shutdown);
	}
#if defined(XLOG_NOLOG) || defined(DEBUG)
	ASSERT(!xlog_debug || tp->t_ticket != NULL);
#else
	ASSERT(tp->t_ticket != NULL);
#endif

	/*
	 * If we need to update the superblock, then do it now.
	 */
	if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
		xfs_trans_apply_sb_deltas(tp);
	}
	XFS_TRANS_APPLY_DQUOT_DELTAS(mp, tp);

	/*
	 * Ask each log item how many log_vector entries it will
	 * need so we can figure out how many to allocate.
	 * Try to avoid the kmem_alloc() call in the common case
	 * by using a vector from the stack when it fits.
	 */
	nvec = xfs_trans_count_vecs(tp);

	if (nvec == 0) {
		xfs_force_shutdown(mp, XFS_LOG_IO_ERROR);
		goto shut_us_down;
	}


	if (nvec <= XFS_TRANS_LOGVEC_COUNT) {
		log_vector = log_vector_fast;
	} else {
		log_vector = (xfs_log_iovec_t *)kmem_alloc(nvec *
						   sizeof(xfs_log_iovec_t),
						   KM_SLEEP);
	}

	/*
	 * Fill in the log_vector and pin the logged items, and
	 * then write the transaction to the log.
	 */
	xfs_trans_fill_vecs(tp, log_vector);

	/*
	 * Ignore errors here. xfs_log_done would do the right thing.
	 * We need to put the ticket, etc. away.
	 */
	error = xfs_log_write(mp, log_vector, nvec, tp->t_ticket,
			     &(tp->t_lsn));

#if defined(XLOG_NOLOG) || defined(DEBUG)
	if (xlog_debug) {
		commit_lsn = xfs_log_done(mp, tp->t_ticket,
					  &commit_iclog, log_flags);
	} else {
		commit_lsn = 0;
		tp->t_lsn = trans_lsn++;
	}
#else
	/*
	 * This is the regular case.  At this point (after the call finishes),
	 * the transaction is committed incore and could go out to disk at
	 * any time.  However, all the items associated with the transaction
	 * are still locked and pinned in memory.
	 */
	commit_lsn = xfs_log_done(mp, tp->t_ticket, &commit_iclog, log_flags);
#endif

	tp->t_commit_lsn = commit_lsn;
	if (nvec > XFS_TRANS_LOGVEC_COUNT) {
		kmem_free(log_vector, nvec * sizeof(xfs_log_iovec_t));
	}

	if (commit_lsn_p)
		*commit_lsn_p = commit_lsn;

	/*
	 * If we got a log write error. Unpin the logitems that we
	 * had pinned, clean up, free trans structure, and return error.
	 */
	if (error || commit_lsn == -1) {
                PFLAGS_RESTORE_FSTRANS(&tp->t_pflags);
		xfs_trans_uncommit(tp, flags|XFS_TRANS_ABORT);
		return XFS_ERROR(EIO);
	}

	/*
	 * Once the transaction has committed, unused
	 * reservations need to be released and changes to
	 * the superblock need to be reflected in the in-core
	 * version.  Do that now.
	 */
	xfs_trans_unreserve_and_mod_sb(tp);

	sync = tp->t_flags & XFS_TRANS_SYNC;

	/*
	 * Tell the LM to call the transaction completion routine
	 * when the log write with LSN commit_lsn completes (e.g.
	 * when the transaction commit really hits the on-disk log).
	 * After this call we cannot reference tp, because the call
	 * can happen at any time and the call will free the transaction
	 * structure pointed to by tp.  The only case where we call
	 * the completion routine (xfs_trans_committed) directly is
	 * if the log is turned off on a debug kernel or we're
	 * running in simulation mode (the log is explicitly turned
	 * off).
	 */
	tp->t_logcb.cb_func = (void(*)(void*, int))xfs_trans_committed;
	tp->t_logcb.cb_arg = tp;

	/*
	 * We need to pass the iclog buffer which was used for the
	 * transaction commit record into this function, and attach
	 * the callback to it. The callback must be attached before
	 * the items are unlocked to avoid racing with other threads
	 * waiting for an item to unlock.
	 */
	shutdown = xfs_log_notify(mp, commit_iclog, &(tp->t_logcb));

	/*
	 * Mark this thread as no longer being in a transaction
	 */
	PFLAGS_RESTORE_FSTRANS(&tp->t_pflags);

	/*
	 * Once all the items of the transaction have been copied
	 * to the in core log and the callback is attached, the
	 * items can be unlocked.
	 *
	 * This will free descriptors pointing to items which were
	 * not logged since there is nothing more to do with them.
	 * For items which were logged, we will keep pointers to them
	 * so they can be unpinned after the transaction commits to disk.
	 * This will also stamp each modified meta-data item with
	 * the commit lsn of this transaction for dependency tracking
	 * purposes.
	 */
	xfs_trans_unlock_items(tp, commit_lsn);

	/*
	 * If we detected a log error earlier, finish committing
	 * the transaction now (unpin log items, etc).
	 *
	 * Order is critical here, to avoid using the transaction
	 * pointer after its been freed (by xfs_trans_committed
	 * either here now, or as a callback).  We cannot do this
	 * step inside xfs_log_notify as was done earlier because
	 * of this issue.
	 */
	if (shutdown)
		xfs_trans_committed(tp, XFS_LI_ABORTED);

	/*
	 * Now that the xfs_trans_committed callback has been attached,
	 * and the items are released we can finally allow the iclog to
	 * go to disk.
	 */
	error = xfs_log_release_iclog(mp, commit_iclog);

	/*
	 * If the transaction needs to be synchronous, then force the
	 * log out now and wait for it.
	 */
	if (sync) {
		if (!error)
			error = xfs_log_force(mp, commit_lsn,
				      XFS_LOG_FORCE | XFS_LOG_SYNC);
		XFS_STATS_INC(xs_trans_sync);
	} else {
		XFS_STATS_INC(xs_trans_async);
	}

	return (error);
}


/*
 * Total up the number of log iovecs needed to commit this
 * transaction.  The transaction itself needs one for the
 * transaction header.  Ask each dirty item in turn how many
 * it needs to get the total.
 */
STATIC uint
xfs_trans_count_vecs(
	xfs_trans_t	*tp)
{
	int			nvecs;
	xfs_log_item_desc_t	*lidp;

	nvecs = 1;
	lidp = xfs_trans_first_item(tp);
	ASSERT(lidp != NULL);

	/* In the non-debug case we need to start bailing out if we
	 * didn't find a log_item here, return zero and let trans_commit
	 * deal with it.
	 */
	if (lidp == NULL)
		return 0;

	while (lidp != NULL) {
		/*
		 * Skip items which aren't dirty in this transaction.
		 */
		if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
			lidp = xfs_trans_next_item(tp, lidp);
			continue;
		}
		lidp->lid_size = IOP_SIZE(lidp->lid_item);
		nvecs += lidp->lid_size;
		lidp = xfs_trans_next_item(tp, lidp);
	}

	return nvecs;
}

/*
 * Called from the trans_commit code when we notice that
 * the filesystem is in the middle of a forced shutdown.
 */
STATIC void
xfs_trans_uncommit(
	xfs_trans_t	*tp,
	uint		flags)
{
	xfs_log_item_desc_t	*lidp;

	for (lidp = xfs_trans_first_item(tp);
	     lidp != NULL;
	     lidp = xfs_trans_next_item(tp, lidp)) {
		/*
		 * Unpin all but those that aren't dirty.
		 */
		if (lidp->lid_flags & XFS_LID_DIRTY)
			IOP_UNPIN_REMOVE(lidp->lid_item, tp);
	}

	xfs_trans_unreserve_and_mod_sb(tp);
	XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(tp->t_mountp, tp);

	xfs_trans_free_items(tp, flags);
	xfs_trans_free_busy(tp);
	xfs_trans_free(tp);
}

/*
 * Fill in the vector with pointers to data to be logged
 * by this transaction.  The transaction header takes
 * the first vector, and then each dirty item takes the
 * number of vectors it indicated it needed in xfs_trans_count_vecs().
 *
 * As each item fills in the entries it needs, also pin the item
 * so that it cannot be flushed out until the log write completes.
 */
STATIC void
xfs_trans_fill_vecs(
	xfs_trans_t		*tp,
	xfs_log_iovec_t		*log_vector)
{
	xfs_log_item_desc_t	*lidp;
	xfs_log_iovec_t		*vecp;
	uint			nitems;

	/*
	 * Skip over the entry for the transaction header, we'll
	 * fill that in at the end.
	 */
	vecp = log_vector + 1;		/* pointer arithmetic */

	nitems = 0;
	lidp = xfs_trans_first_item(tp);
	ASSERT(lidp != NULL);
	while (lidp != NULL) {
		/*
		 * Skip items which aren't dirty in this transaction.
		 */
		if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
			lidp = xfs_trans_next_item(tp, lidp);
			continue;
		}
		/*
		 * The item may be marked dirty but not log anything.
		 * This can be used to get called when a transaction
		 * is committed.
		 */
		if (lidp->lid_size) {
			nitems++;
		}
		IOP_FORMAT(lidp->lid_item, vecp);
		vecp += lidp->lid_size;		/* pointer arithmetic */
		IOP_PIN(lidp->lid_item);
		lidp = xfs_trans_next_item(tp, lidp);
	}

	/*
	 * Now that we've counted the number of items in this
	 * transaction, fill in the transaction header.
	 */
	tp->t_header.th_magic = XFS_TRANS_HEADER_MAGIC;
	tp->t_header.th_type = tp->t_type;
	tp->t_header.th_num_items = nitems;
	log_vector->i_addr = (xfs_caddr_t)&tp->t_header;
	log_vector->i_len = sizeof(xfs_trans_header_t);
}


/*
 * Unlock all of the transaction's items and free the transaction.
 * The transaction must not have modified any of its items, because
 * there is no way to restore them to their previous state.
 *
 * If the transaction has made a log reservation, make sure to release
 * it as well.
 */
void
xfs_trans_cancel(
	xfs_trans_t		*tp,
	int			flags)
{
	int			log_flags;
#ifdef DEBUG
	xfs_log_item_chunk_t	*licp;
	xfs_log_item_desc_t	*lidp;
	xfs_log_item_t		*lip;
	int			i;
#endif

	/*
	 * See if the caller is being too lazy to figure out if
	 * the transaction really needs an abort.
	 */
	if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY))
		flags &= ~XFS_TRANS_ABORT;
	/*
	 * See if the caller is relying on us to shut down the
	 * filesystem.  This happens in paths where we detect
	 * corruption and decide to give up.
	 */
	if ((tp->t_flags & XFS_TRANS_DIRTY) &&
	    !XFS_FORCED_SHUTDOWN(tp->t_mountp))
		xfs_force_shutdown(tp->t_mountp, XFS_CORRUPT_INCORE);
#ifdef DEBUG
	if (!(flags & XFS_TRANS_ABORT)) {
		licp = &(tp->t_items);
		while (licp != NULL) {
			lidp = licp->lic_descs;
			for (i = 0; i < licp->lic_unused; i++, lidp++) {
				if (XFS_LIC_ISFREE(licp, i)) {
					continue;
				}

				lip = lidp->lid_item;
				if (!XFS_FORCED_SHUTDOWN(tp->t_mountp))
					ASSERT(!(lip->li_type == XFS_LI_EFD));
			}
			licp = licp->lic_next;
		}
	}
#endif
	xfs_trans_unreserve_and_mod_sb(tp);
	XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(tp->t_mountp, tp);

	if (tp->t_ticket) {
		if (flags & XFS_TRANS_RELEASE_LOG_RES) {
			ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
			log_flags = XFS_LOG_REL_PERM_RESERV;
		} else {
			log_flags = 0;
		}
		xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags);
	}

	/* mark this thread as no longer being in a transaction */
        PFLAGS_RESTORE_FSTRANS(&tp->t_pflags);

	xfs_trans_free_items(tp, flags);
	xfs_trans_free_busy(tp);
	xfs_trans_free(tp);
}


/*
 * Free the transaction structure.  If there is more clean up
 * to do when the structure is freed, add it here.
 */
STATIC void
xfs_trans_free(
	xfs_trans_t	*tp)
{
	atomic_dec(&tp->t_mountp->m_active_trans);
	XFS_TRANS_FREE_DQINFO(tp->t_mountp, tp);
	kmem_zone_free(xfs_trans_zone, tp);
}


/*
 * THIS SHOULD BE REWRITTEN TO USE xfs_trans_next_item().
 *
 * This is typically called by the LM when a transaction has been fully
 * committed to disk.  It needs to unpin the items which have
 * been logged by the transaction and update their positions
 * in the AIL if necessary.
 * This also gets called when the transactions didn't get written out
 * because of an I/O error. Abortflag & XFS_LI_ABORTED is set then.
 *
 * Call xfs_trans_chunk_committed() to process the items in
 * each chunk.
 */
STATIC void
xfs_trans_committed(
	xfs_trans_t	*tp,
	int		abortflag)
{
	xfs_log_item_chunk_t	*licp;
	xfs_log_item_chunk_t	*next_licp;
	xfs_log_busy_chunk_t	*lbcp;
	xfs_log_busy_slot_t	*lbsp;
	int			i;

	/*
	 * Call the transaction's completion callback if there
	 * is one.
	 */
	if (tp->t_callback != NULL) {
		tp->t_callback(tp, tp->t_callarg);
	}

	/*
	 * Special case the chunk embedded in the transaction.
	 */
	licp = &(tp->t_items);
	if (!(XFS_LIC_ARE_ALL_FREE(licp))) {
		xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag);
	}

	/*
	 * Process the items in each chunk in turn.
	 */
	licp = licp->lic_next;
	while (licp != NULL) {
		ASSERT(!XFS_LIC_ARE_ALL_FREE(licp));
		xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag);
		next_licp = licp->lic_next;
		kmem_free(licp, sizeof(xfs_log_item_chunk_t));
		licp = next_licp;
	}

	/*
	 * Clear all the per-AG busy list items listed in this transaction
	 */
	lbcp = &tp->t_busy;
	while (lbcp != NULL) {
		for (i = 0, lbsp = lbcp->lbc_busy; i < lbcp->lbc_unused; i++, lbsp++) {
			if (!XFS_LBC_ISFREE(lbcp, i)) {
				xfs_alloc_clear_busy(tp, lbsp->lbc_ag,
						     lbsp->lbc_idx);
			}
		}
		lbcp = lbcp->lbc_next;
	}
	xfs_trans_free_busy(tp);

	/*
	 * That's it for the transaction structure.  Free it.
	 */
	xfs_trans_free(tp);
}

/*
 * This is called to perform the commit processing for each
 * item described by the given chunk.
 *
 * The commit processing consists of unlocking items which were
 * held locked with the SYNC_UNLOCK attribute, calling the committed
 * routine of each logged item, updating the item's position in the AIL
 * if necessary, and unpinning each item.  If the committed routine
 * returns -1, then do nothing further with the item because it
 * may have been freed.
 *
 * Since items are unlocked when they are copied to the incore
 * log, it is possible for two transactions to be completing
 * and manipulating the same item simultaneously.  The AIL lock
 * will protect the lsn field of each item.  The value of this
 * field can never go backwards.
 *
 * We unpin the items after repositioning them in the AIL, because
 * otherwise they could be immediately flushed and we'd have to race
 * with the flusher trying to pull the item from the AIL as we add it.
 */
STATIC void
xfs_trans_chunk_committed(
	xfs_log_item_chunk_t	*licp,
	xfs_lsn_t		lsn,
	int			aborted)
{
	xfs_log_item_desc_t	*lidp;
	xfs_log_item_t		*lip;
	xfs_lsn_t		item_lsn;
	struct xfs_mount	*mp;
	int			i;
	SPLDECL(s);

	lidp = licp->lic_descs;
	for (i = 0; i < licp->lic_unused; i++, lidp++) {
		if (XFS_LIC_ISFREE(licp, i)) {
			continue;
		}

		lip = lidp->lid_item;
		if (aborted)
			lip->li_flags |= XFS_LI_ABORTED;

		/*
		 * Send in the ABORTED flag to the COMMITTED routine
		 * so that it knows whether the transaction was aborted
		 * or not.
		 */
		item_lsn = IOP_COMMITTED(lip, lsn);

		/*
		 * If the committed routine returns -1, make
		 * no more references to the item.
		 */
		if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0) {
			continue;
		}

		/*
		 * If the returned lsn is greater than what it
		 * contained before, update the location of the
		 * item in the AIL.  If it is not, then do nothing.
		 * Items can never move backwards in the AIL.
		 *
		 * While the new lsn should usually be greater, it
		 * is possible that a later transaction completing
		 * simultaneously with an earlier one using the
		 * same item could complete first with a higher lsn.
		 * This would cause the earlier transaction to fail
		 * the test below.
		 */
		mp = lip->li_mountp;
		AIL_LOCK(mp,s);
		if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0) {
			/*
			 * This will set the item's lsn to item_lsn
			 * and update the position of the item in
			 * the AIL.
			 *
			 * xfs_trans_update_ail() drops the AIL lock.
			 */
			xfs_trans_update_ail(mp, lip, item_lsn, s);
		} else {
			AIL_UNLOCK(mp, s);
		}

		/*
		 * Now that we've repositioned the item in the AIL,
		 * unpin it so it can be flushed. Pass information
		 * about buffer stale state down from the log item
		 * flags, if anyone else stales the buffer we do not
		 * want to pay any attention to it.
		 */
		IOP_UNPIN(lip, lidp->lid_flags & XFS_LID_BUF_STALE);
	}
}