summaryrefslogtreecommitdiff
path: root/fs/gfs2/ops_fstype.c
blob: 8a102f7310034110b6438d932c12094d0cd7b5eb (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
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/kthread.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/gfs2_ondisk.h>
#include <linux/slow-work.h>
#include <linux/quotaops.h>

#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "recovery.h"
#include "rgrp.h"
#include "super.h"
#include "sys.h"
#include "util.h"
#include "log.h"
#include "quota.h"
#include "dir.h"
#include "trace_gfs2.h"

#define DO 0
#define UNDO 1

static const u32 gfs2_old_fs_formats[] = {
        0
};

static const u32 gfs2_old_multihost_formats[] = {
        0
};

/**
 * gfs2_tune_init - Fill a gfs2_tune structure with default values
 * @gt: tune
 *
 */

static void gfs2_tune_init(struct gfs2_tune *gt)
{
	spin_lock_init(&gt->gt_spin);

	gt->gt_incore_log_blocks = 1024;
	gt->gt_logd_secs = 1;
	gt->gt_quota_simul_sync = 64;
	gt->gt_quota_warn_period = 10;
	gt->gt_quota_scale_num = 1;
	gt->gt_quota_scale_den = 1;
	gt->gt_new_files_jdata = 0;
	gt->gt_max_readahead = 1 << 18;
	gt->gt_stall_secs = 600;
	gt->gt_complain_secs = 10;
}

static struct gfs2_sbd *init_sbd(struct super_block *sb)
{
	struct gfs2_sbd *sdp;

	sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
	if (!sdp)
		return NULL;

	sb->s_fs_info = sdp;
	sdp->sd_vfs = sb;

	gfs2_tune_init(&sdp->sd_tune);

	init_waitqueue_head(&sdp->sd_glock_wait);
	atomic_set(&sdp->sd_glock_disposal, 0);
	spin_lock_init(&sdp->sd_statfs_spin);

	spin_lock_init(&sdp->sd_rindex_spin);
	mutex_init(&sdp->sd_rindex_mutex);
	INIT_LIST_HEAD(&sdp->sd_rindex_list);
	INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);

	INIT_LIST_HEAD(&sdp->sd_jindex_list);
	spin_lock_init(&sdp->sd_jindex_spin);
	mutex_init(&sdp->sd_jindex_mutex);

	INIT_LIST_HEAD(&sdp->sd_quota_list);
	mutex_init(&sdp->sd_quota_mutex);
	init_waitqueue_head(&sdp->sd_quota_wait);
	INIT_LIST_HEAD(&sdp->sd_trunc_list);
	spin_lock_init(&sdp->sd_trunc_lock);

	spin_lock_init(&sdp->sd_log_lock);

	INIT_LIST_HEAD(&sdp->sd_log_le_buf);
	INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
	INIT_LIST_HEAD(&sdp->sd_log_le_rg);
	INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
	INIT_LIST_HEAD(&sdp->sd_log_le_ordered);

	mutex_init(&sdp->sd_log_reserve_mutex);
	INIT_LIST_HEAD(&sdp->sd_ail1_list);
	INIT_LIST_HEAD(&sdp->sd_ail2_list);

	init_rwsem(&sdp->sd_log_flush_lock);
	atomic_set(&sdp->sd_log_in_flight, 0);
	init_waitqueue_head(&sdp->sd_log_flush_wait);

	INIT_LIST_HEAD(&sdp->sd_revoke_list);

	mutex_init(&sdp->sd_freeze_lock);

	return sdp;
}


/**
 * gfs2_check_sb - Check superblock
 * @sdp: the filesystem
 * @sb: The superblock
 * @silent: Don't print a message if the check fails
 *
 * Checks the version code of the FS is one that we understand how to
 * read and that the sizes of the various on-disk structures have not
 * changed.
 */

static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
{
	unsigned int x;

	if (sb->sb_magic != GFS2_MAGIC ||
	    sb->sb_type != GFS2_METATYPE_SB) {
		if (!silent)
			printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
		return -EINVAL;
	}

	/*  If format numbers match exactly, we're done.  */

	if (sb->sb_fs_format == GFS2_FORMAT_FS &&
	    sb->sb_multihost_format == GFS2_FORMAT_MULTI)
		return 0;

	if (sb->sb_fs_format != GFS2_FORMAT_FS) {
		for (x = 0; gfs2_old_fs_formats[x]; x++)
			if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
				break;

		if (!gfs2_old_fs_formats[x]) {
			printk(KERN_WARNING
			       "GFS2: code version (%u, %u) is incompatible "
			       "with ondisk format (%u, %u)\n",
			       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
			       sb->sb_fs_format, sb->sb_multihost_format);
			printk(KERN_WARNING
			       "GFS2: I don't know how to upgrade this FS\n");
			return -EINVAL;
		}
	}

	if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
		for (x = 0; gfs2_old_multihost_formats[x]; x++)
			if (gfs2_old_multihost_formats[x] ==
			    sb->sb_multihost_format)
				break;

		if (!gfs2_old_multihost_formats[x]) {
			printk(KERN_WARNING
			       "GFS2: code version (%u, %u) is incompatible "
			       "with ondisk format (%u, %u)\n",
			       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
			       sb->sb_fs_format, sb->sb_multihost_format);
			printk(KERN_WARNING
			       "GFS2: I don't know how to upgrade this FS\n");
			return -EINVAL;
		}
	}

	if (!sdp->sd_args.ar_upgrade) {
		printk(KERN_WARNING
		       "GFS2: code version (%u, %u) is incompatible "
		       "with ondisk format (%u, %u)\n",
		       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
		       sb->sb_fs_format, sb->sb_multihost_format);
		printk(KERN_INFO
		       "GFS2: Use the \"upgrade\" mount option to upgrade "
		       "the FS\n");
		printk(KERN_INFO "GFS2: See the manual for more details\n");
		return -EINVAL;
	}

	return 0;
}

static void end_bio_io_page(struct bio *bio, int error)
{
	struct page *page = bio->bi_private;

	if (!error)
		SetPageUptodate(page);
	else
		printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
	unlock_page(page);
}

static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
{
	const struct gfs2_sb *str = buf;

	sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
	sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
	sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
	sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
	sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
	sb->sb_bsize = be32_to_cpu(str->sb_bsize);
	sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
	sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
	sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
	sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
	sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);

	memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
	memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
	memcpy(sb->sb_uuid, str->sb_uuid, 16);
}

/**
 * gfs2_read_super - Read the gfs2 super block from disk
 * @sdp: The GFS2 super block
 * @sector: The location of the super block
 * @error: The error code to return
 *
 * This uses the bio functions to read the super block from disk
 * because we want to be 100% sure that we never read cached data.
 * A super block is read twice only during each GFS2 mount and is
 * never written to by the filesystem. The first time its read no
 * locks are held, and the only details which are looked at are those
 * relating to the locking protocol. Once locking is up and working,
 * the sb is read again under the lock to establish the location of
 * the master directory (contains pointers to journals etc) and the
 * root directory.
 *
 * Returns: 0 on success or error
 */

static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
{
	struct super_block *sb = sdp->sd_vfs;
	struct gfs2_sb *p;
	struct page *page;
	struct bio *bio;

	page = alloc_page(GFP_NOFS);
	if (unlikely(!page))
		return -ENOBUFS;

	ClearPageUptodate(page);
	ClearPageDirty(page);
	lock_page(page);

	bio = bio_alloc(GFP_NOFS, 1);
	bio->bi_sector = sector * (sb->s_blocksize >> 9);
	bio->bi_bdev = sb->s_bdev;
	bio_add_page(bio, page, PAGE_SIZE, 0);

	bio->bi_end_io = end_bio_io_page;
	bio->bi_private = page;
	submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
	wait_on_page_locked(page);
	bio_put(bio);
	if (!PageUptodate(page)) {
		__free_page(page);
		return -EIO;
	}
	p = kmap(page);
	gfs2_sb_in(&sdp->sd_sb, p);
	kunmap(page);
	__free_page(page);
	return 0;
}

/**
 * gfs2_read_sb - Read super block
 * @sdp: The GFS2 superblock
 * @silent: Don't print message if mount fails
 *
 */

static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
{
	u32 hash_blocks, ind_blocks, leaf_blocks;
	u32 tmp_blocks;
	unsigned int x;
	int error;

	error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
	if (error) {
		if (!silent)
			fs_err(sdp, "can't read superblock\n");
		return error;
	}

	error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
	if (error)
		return error;

	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
			       GFS2_BASIC_BLOCK_SHIFT;
	sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
	sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
			  sizeof(struct gfs2_dinode)) / sizeof(u64);
	sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
			  sizeof(struct gfs2_meta_header)) / sizeof(u64);
	sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
	sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
	sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
	sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
	sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
				sizeof(struct gfs2_meta_header)) /
			        sizeof(struct gfs2_quota_change);

	/* Compute maximum reservation required to add a entry to a directory */

	hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
			     sdp->sd_jbsize);

	ind_blocks = 0;
	for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
		tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
		ind_blocks += tmp_blocks;
	}

	leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;

	sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;

	sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
				sizeof(struct gfs2_dinode);
	sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
	for (x = 2;; x++) {
		u64 space, d;
		u32 m;

		space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
		d = space;
		m = do_div(d, sdp->sd_inptrs);

		if (d != sdp->sd_heightsize[x - 1] || m)
			break;
		sdp->sd_heightsize[x] = space;
	}
	sdp->sd_max_height = x;
	sdp->sd_heightsize[x] = ~0;
	gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);

	sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
				 sizeof(struct gfs2_dinode);
	sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
	for (x = 2;; x++) {
		u64 space, d;
		u32 m;

		space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
		d = space;
		m = do_div(d, sdp->sd_inptrs);

		if (d != sdp->sd_jheightsize[x - 1] || m)
			break;
		sdp->sd_jheightsize[x] = space;
	}
	sdp->sd_max_jheight = x;
	sdp->sd_jheightsize[x] = ~0;
	gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);

	return 0;
}

static int init_names(struct gfs2_sbd *sdp, int silent)
{
	char *proto, *table;
	int error = 0;

	proto = sdp->sd_args.ar_lockproto;
	table = sdp->sd_args.ar_locktable;

	/*  Try to autodetect  */

	if (!proto[0] || !table[0]) {
		error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
		if (error)
			return error;

		error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
		if (error)
			goto out;

		if (!proto[0])
			proto = sdp->sd_sb.sb_lockproto;
		if (!table[0])
			table = sdp->sd_sb.sb_locktable;
	}

	if (!table[0])
		table = sdp->sd_vfs->s_id;

	strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
	strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);

	table = sdp->sd_table_name;
	while ((table = strchr(table, '/')))
		*table = '_';

out:
	return error;
}

static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
			int undo)
{
	int error = 0;

	if (undo)
		goto fail_trans;

	error = gfs2_glock_nq_num(sdp,
				  GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
				  LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
				  mount_gh);
	if (error) {
		fs_err(sdp, "can't acquire mount glock: %d\n", error);
		goto fail;
	}

	error = gfs2_glock_nq_num(sdp,
				  GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
				  LM_ST_SHARED,
				  LM_FLAG_NOEXP | GL_EXACT,
				  &sdp->sd_live_gh);
	if (error) {
		fs_err(sdp, "can't acquire live glock: %d\n", error);
		goto fail_mount;
	}

	error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
			       CREATE, &sdp->sd_rename_gl);
	if (error) {
		fs_err(sdp, "can't create rename glock: %d\n", error);
		goto fail_live;
	}

	error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
			       CREATE, &sdp->sd_trans_gl);
	if (error) {
		fs_err(sdp, "can't create transaction glock: %d\n", error);
		goto fail_rename;
	}

	return 0;

fail_trans:
	gfs2_glock_put(sdp->sd_trans_gl);
fail_rename:
	gfs2_glock_put(sdp->sd_rename_gl);
fail_live:
	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
fail_mount:
	gfs2_glock_dq_uninit(mount_gh);
fail:
	return error;
}

static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
			    u64 no_addr, const char *name)
{
	struct gfs2_sbd *sdp = sb->s_fs_info;
	struct dentry *dentry;
	struct inode *inode;

	inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
	if (IS_ERR(inode)) {
		fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
		return PTR_ERR(inode);
	}
	dentry = d_alloc_root(inode);
	if (!dentry) {
		fs_err(sdp, "can't alloc %s dentry\n", name);
		iput(inode);
		return -ENOMEM;
	}
	dentry->d_op = &gfs2_dops;
	*dptr = dentry;
	return 0;
}

static int init_sb(struct gfs2_sbd *sdp, int silent)
{
	struct super_block *sb = sdp->sd_vfs;
	struct gfs2_holder sb_gh;
	u64 no_addr;
	int ret;

	ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
				LM_ST_SHARED, 0, &sb_gh);
	if (ret) {
		fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
		return ret;
	}

	ret = gfs2_read_sb(sdp, silent);
	if (ret) {
		fs_err(sdp, "can't read superblock: %d\n", ret);
		goto out;
	}

	/* Set up the buffer cache and SB for real */
	if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
		ret = -EINVAL;
		fs_err(sdp, "FS block size (%u) is too small for device "
		       "block size (%u)\n",
		       sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
		goto out;
	}
	if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
		ret = -EINVAL;
		fs_err(sdp, "FS block size (%u) is too big for machine "
		       "page size (%u)\n",
		       sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
		goto out;
	}
	sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);

	/* Get the root inode */
	no_addr = sdp->sd_sb.sb_root_dir.no_addr;
	ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
	if (ret)
		goto out;

	/* Get the master inode */
	no_addr = sdp->sd_sb.sb_master_dir.no_addr;
	ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
	if (ret) {
		dput(sdp->sd_root_dir);
		goto out;
	}
	sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
out:
	gfs2_glock_dq_uninit(&sb_gh);
	return ret;
}

/**
 * map_journal_extents - create a reusable "extent" mapping from all logical
 * blocks to all physical blocks for the given journal.  This will save
 * us time when writing journal blocks.  Most journals will have only one
 * extent that maps all their logical blocks.  That's because gfs2.mkfs
 * arranges the journal blocks sequentially to maximize performance.
 * So the extent would map the first block for the entire file length.
 * However, gfs2_jadd can happen while file activity is happening, so
 * those journals may not be sequential.  Less likely is the case where
 * the users created their own journals by mounting the metafs and
 * laying it out.  But it's still possible.  These journals might have
 * several extents.
 *
 * TODO: This should be done in bigger chunks rather than one block at a time,
 *       but since it's only done at mount time, I'm not worried about the
 *       time it takes.
 */
static int map_journal_extents(struct gfs2_sbd *sdp)
{
	struct gfs2_jdesc *jd = sdp->sd_jdesc;
	unsigned int lb;
	u64 db, prev_db; /* logical block, disk block, prev disk block */
	struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
	struct gfs2_journal_extent *jext = NULL;
	struct buffer_head bh;
	int rc = 0;

	prev_db = 0;

	for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
		bh.b_state = 0;
		bh.b_blocknr = 0;
		bh.b_size = 1 << ip->i_inode.i_blkbits;
		rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
		db = bh.b_blocknr;
		if (rc || !db) {
			printk(KERN_INFO "GFS2 journal mapping error %d: lb="
			       "%u db=%llu\n", rc, lb, (unsigned long long)db);
			break;
		}
		if (!prev_db || db != prev_db + 1) {
			jext = kzalloc(sizeof(struct gfs2_journal_extent),
				       GFP_KERNEL);
			if (!jext) {
				printk(KERN_INFO "GFS2 error: out of memory "
				       "mapping journal extents.\n");
				rc = -ENOMEM;
				break;
			}
			jext->dblock = db;
			jext->lblock = lb;
			jext->blocks = 1;
			list_add_tail(&jext->extent_list, &jd->extent_list);
		} else {
			jext->blocks++;
		}
		prev_db = db;
	}
	return rc;
}

static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
{
	char *message = "FIRSTMOUNT=Done";
	char *envp[] = { message, NULL };
	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	ls->ls_first_done = 1;
	kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
}

/**
 * gfs2_jindex_hold - Grab a lock on the jindex
 * @sdp: The GFS2 superblock
 * @ji_gh: the holder for the jindex glock
 *
 * Returns: errno
 */

static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
{
	struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
	struct qstr name;
	char buf[20];
	struct gfs2_jdesc *jd;
	int error;

	name.name = buf;

	mutex_lock(&sdp->sd_jindex_mutex);

	for (;;) {
		error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
		if (error)
			break;

		name.len = sprintf(buf, "journal%u", sdp->sd_journals);
		name.hash = gfs2_disk_hash(name.name, name.len);

		error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
		if (error == -ENOENT) {
			error = 0;
			break;
		}

		gfs2_glock_dq_uninit(ji_gh);

		if (error)
			break;

		error = -ENOMEM;
		jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
		if (!jd)
			break;

		INIT_LIST_HEAD(&jd->extent_list);
		slow_work_init(&jd->jd_work, &gfs2_recover_ops);
		jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
		if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
			if (!jd->jd_inode)
				error = -ENOENT;
			else
				error = PTR_ERR(jd->jd_inode);
			kfree(jd);
			break;
		}

		spin_lock(&sdp->sd_jindex_spin);
		jd->jd_jid = sdp->sd_journals++;
		list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
		spin_unlock(&sdp->sd_jindex_spin);
	}

	mutex_unlock(&sdp->sd_jindex_mutex);

	return error;
}

static int init_journal(struct gfs2_sbd *sdp, int undo)
{
	struct inode *master = sdp->sd_master_dir->d_inode;
	struct gfs2_holder ji_gh;
	struct gfs2_inode *ip;
	int jindex = 1;
	int error = 0;

	if (undo) {
		jindex = 0;
		goto fail_jinode_gh;
	}

	sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
	if (IS_ERR(sdp->sd_jindex)) {
		fs_err(sdp, "can't lookup journal index: %d\n", error);
		return PTR_ERR(sdp->sd_jindex);
	}
	ip = GFS2_I(sdp->sd_jindex);

	/* Load in the journal index special file */

	error = gfs2_jindex_hold(sdp, &ji_gh);
	if (error) {
		fs_err(sdp, "can't read journal index: %d\n", error);
		goto fail;
	}

	error = -EINVAL;
	if (!gfs2_jindex_size(sdp)) {
		fs_err(sdp, "no journals!\n");
		goto fail_jindex;
	}

	if (sdp->sd_args.ar_spectator) {
		sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
	} else {
		if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
			fs_err(sdp, "can't mount journal #%u\n",
			       sdp->sd_lockstruct.ls_jid);
			fs_err(sdp, "there are only %u journals (0 - %u)\n",
			       gfs2_jindex_size(sdp),
			       gfs2_jindex_size(sdp) - 1);
			goto fail_jindex;
		}
		sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);

		error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
					  &gfs2_journal_glops,
					  LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
					  &sdp->sd_journal_gh);
		if (error) {
			fs_err(sdp, "can't acquire journal glock: %d\n", error);
			goto fail_jindex;
		}

		ip = GFS2_I(sdp->sd_jdesc->jd_inode);
		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
					   LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
					   &sdp->sd_jinode_gh);
		if (error) {
			fs_err(sdp, "can't acquire journal inode glock: %d\n",
			       error);
			goto fail_journal_gh;
		}

		error = gfs2_jdesc_check(sdp->sd_jdesc);
		if (error) {
			fs_err(sdp, "my journal (%u) is bad: %d\n",
			       sdp->sd_jdesc->jd_jid, error);
			goto fail_jinode_gh;
		}
		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);

		/* Map the extents for this journal's blocks */
		map_journal_extents(sdp);
	}
	trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));

	if (sdp->sd_lockstruct.ls_first) {
		unsigned int x;
		for (x = 0; x < sdp->sd_journals; x++) {
			error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
			if (error) {
				fs_err(sdp, "error recovering journal %u: %d\n",
				       x, error);
				goto fail_jinode_gh;
			}
		}

		gfs2_others_may_mount(sdp);
	} else if (!sdp->sd_args.ar_spectator) {
		error = gfs2_recover_journal(sdp->sd_jdesc);
		if (error) {
			fs_err(sdp, "error recovering my journal: %d\n", error);
			goto fail_jinode_gh;
		}
	}

	set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
	gfs2_glock_dq_uninit(&ji_gh);
	jindex = 0;

	return 0;

fail_jinode_gh:
	if (!sdp->sd_args.ar_spectator)
		gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
fail_journal_gh:
	if (!sdp->sd_args.ar_spectator)
		gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
fail_jindex:
	gfs2_jindex_free(sdp);
	if (jindex)
		gfs2_glock_dq_uninit(&ji_gh);
fail:
	iput(sdp->sd_jindex);
	return error;
}


static int init_inodes(struct gfs2_sbd *sdp, int undo)
{
	int error = 0;
	struct gfs2_inode *ip;
	struct inode *master = sdp->sd_master_dir->d_inode;

	if (undo)
		goto fail_qinode;

	error = init_journal(sdp, undo);
	if (error)
		goto fail;

	/* Read in the master statfs inode */
	sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
	if (IS_ERR(sdp->sd_statfs_inode)) {
		error = PTR_ERR(sdp->sd_statfs_inode);
		fs_err(sdp, "can't read in statfs inode: %d\n", error);
		goto fail_journal;
	}

	/* Read in the resource index inode */
	sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
	if (IS_ERR(sdp->sd_rindex)) {
		error = PTR_ERR(sdp->sd_rindex);
		fs_err(sdp, "can't get resource index inode: %d\n", error);
		goto fail_statfs;
	}
	ip = GFS2_I(sdp->sd_rindex);
	sdp->sd_rindex_uptodate = 0;

	/* Read in the quota inode */
	sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
	if (IS_ERR(sdp->sd_quota_inode)) {
		error = PTR_ERR(sdp->sd_quota_inode);
		fs_err(sdp, "can't get quota file inode: %d\n", error);
		goto fail_rindex;
	}
	return 0;

fail_qinode:
	iput(sdp->sd_quota_inode);
fail_rindex:
	gfs2_clear_rgrpd(sdp);
	iput(sdp->sd_rindex);
fail_statfs:
	iput(sdp->sd_statfs_inode);
fail_journal:
	init_journal(sdp, UNDO);
fail:
	return error;
}

static int init_per_node(struct gfs2_sbd *sdp, int undo)
{
	struct inode *pn = NULL;
	char buf[30];
	int error = 0;
	struct gfs2_inode *ip;
	struct inode *master = sdp->sd_master_dir->d_inode;

	if (sdp->sd_args.ar_spectator)
		return 0;

	if (undo)
		goto fail_qc_gh;

	pn = gfs2_lookup_simple(master, "per_node");
	if (IS_ERR(pn)) {
		error = PTR_ERR(pn);
		fs_err(sdp, "can't find per_node directory: %d\n", error);
		return error;
	}

	sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
	sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
	if (IS_ERR(sdp->sd_sc_inode)) {
		error = PTR_ERR(sdp->sd_sc_inode);
		fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
		goto fail;
	}

	sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
	sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
	if (IS_ERR(sdp->sd_qc_inode)) {
		error = PTR_ERR(sdp->sd_qc_inode);
		fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
		goto fail_ut_i;
	}

	iput(pn);
	pn = NULL;

	ip = GFS2_I(sdp->sd_sc_inode);
	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
				   &sdp->sd_sc_gh);
	if (error) {
		fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
		goto fail_qc_i;
	}

	ip = GFS2_I(sdp->sd_qc_inode);
	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
				   &sdp->sd_qc_gh);
	if (error) {
		fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
		goto fail_ut_gh;
	}

	return 0;

fail_qc_gh:
	gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
fail_ut_gh:
	gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
fail_qc_i:
	iput(sdp->sd_qc_inode);
fail_ut_i:
	iput(sdp->sd_sc_inode);
fail:
	if (pn)
		iput(pn);
	return error;
}

static int init_threads(struct gfs2_sbd *sdp, int undo)
{
	struct task_struct *p;
	int error = 0;

	if (undo)
		goto fail_quotad;

	sdp->sd_log_flush_time = jiffies;

	p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
	error = IS_ERR(p);
	if (error) {
		fs_err(sdp, "can't start logd thread: %d\n", error);
		return error;
	}
	sdp->sd_logd_process = p;

	p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
	error = IS_ERR(p);
	if (error) {
		fs_err(sdp, "can't start quotad thread: %d\n", error);
		goto fail;
	}
	sdp->sd_quotad_process = p;

	return 0;


fail_quotad:
	kthread_stop(sdp->sd_quotad_process);
fail:
	kthread_stop(sdp->sd_logd_process);
	return error;
}

static const match_table_t nolock_tokens = {
	{ Opt_jid, "jid=%d\n", },
	{ Opt_err, NULL },
};

static void nolock_put_lock(struct kmem_cache *cachep, struct gfs2_glock *gl)
{
	struct gfs2_sbd *sdp = gl->gl_sbd;
	kmem_cache_free(cachep, gl);
	if (atomic_dec_and_test(&sdp->sd_glock_disposal))
		wake_up(&sdp->sd_glock_wait);
}

static const struct lm_lockops nolock_ops = {
	.lm_proto_name = "lock_nolock",
	.lm_put_lock = nolock_put_lock,
	.lm_tokens = &nolock_tokens,
};

/**
 * gfs2_lm_mount - mount a locking protocol
 * @sdp: the filesystem
 * @args: mount arguements
 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 *
 * Returns: errno
 */

static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
{
	const struct lm_lockops *lm;
	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	struct gfs2_args *args = &sdp->sd_args;
	const char *proto = sdp->sd_proto_name;
	const char *table = sdp->sd_table_name;
	const char *fsname;
	char *o, *options;
	int ret;

	if (!strcmp("lock_nolock", proto)) {
		lm = &nolock_ops;
		sdp->sd_args.ar_localflocks = 1;
		sdp->sd_args.ar_localcaching = 1;
#ifdef CONFIG_GFS2_FS_LOCKING_DLM
	} else if (!strcmp("lock_dlm", proto)) {
		lm = &gfs2_dlm_ops;
#endif
	} else {
		printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
		return -ENOENT;
	}

	fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);

	ls->ls_ops = lm;
	ls->ls_first = 1;

	for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
		substring_t tmp[MAX_OPT_ARGS];
		int token, option;

		if (!o || !*o)
			continue;

		token = match_token(o, *lm->lm_tokens, tmp);
		switch (token) {
		case Opt_jid:
			ret = match_int(&tmp[0], &option);
			if (ret || option < 0) 
				goto hostdata_error;
			ls->ls_jid = option;
			break;
		case Opt_id:
			/* Obsolete, but left for backward compat purposes */
			break;
		case Opt_first:
			ret = match_int(&tmp[0], &option);
			if (ret || (option != 0 && option != 1))
				goto hostdata_error;
			ls->ls_first = option;
			break;
		case Opt_nodir:
			ret = match_int(&tmp[0], &option);
			if (ret || (option != 0 && option != 1))
				goto hostdata_error;
			ls->ls_nodir = option;
			break;
		case Opt_err:
		default:
hostdata_error:
			fs_info(sdp, "unknown hostdata (%s)\n", o);
			return -EINVAL;
		}
	}

	if (sdp->sd_args.ar_spectator)
		snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
	else
		snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
			 sdp->sd_lockstruct.ls_jid);

	fsname = strchr(table, ':');
	if (fsname)
		fsname++;
	if (lm->lm_mount == NULL) {
		fs_info(sdp, "Now mounting FS...\n");
		return 0;
	}
	ret = lm->lm_mount(sdp, fsname);
	if (ret == 0)
		fs_info(sdp, "Joined cluster. Now mounting FS...\n");
	return ret;
}

void gfs2_lm_unmount(struct gfs2_sbd *sdp)
{
	const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
	    lm->lm_unmount)
		lm->lm_unmount(sdp);
}

void gfs2_online_uevent(struct gfs2_sbd *sdp)
{
	struct super_block *sb = sdp->sd_vfs;
	char ro[20];
	char spectator[20];
	char *envp[] = { ro, spectator, NULL };
	sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
	sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
	kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
}

/**
 * fill_super - Read in superblock
 * @sb: The VFS superblock
 * @data: Mount options
 * @silent: Don't complain if it's not a GFS2 filesystem
 *
 * Returns: errno
 */

static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
{
	struct gfs2_sbd *sdp;
	struct gfs2_holder mount_gh;
	int error;

	sdp = init_sbd(sb);
	if (!sdp) {
		printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
		return -ENOMEM;
	}
	sdp->sd_args = *args;

	if (sdp->sd_args.ar_spectator) {
                sb->s_flags |= MS_RDONLY;
		set_bit(SDF_NORECOVERY, &sdp->sd_flags);
	}
	if (sdp->sd_args.ar_posix_acl)
		sb->s_flags |= MS_POSIXACL;
	if (sdp->sd_args.ar_nobarrier)
		set_bit(SDF_NOBARRIERS, &sdp->sd_flags);

	sb->s_magic = GFS2_MAGIC;
	sb->s_op = &gfs2_super_ops;
	sb->s_export_op = &gfs2_export_ops;
	sb->s_xattr = gfs2_xattr_handlers;
	sb->s_qcop = &gfs2_quotactl_ops;
	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
	sb->s_time_gran = 1;
	sb->s_maxbytes = MAX_LFS_FILESIZE;

	/* Set up the buffer cache and fill in some fake block size values
	   to allow us to read-in the on-disk superblock. */
	sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
	sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
                               GFS2_BASIC_BLOCK_SHIFT;
	sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;

	sdp->sd_tune.gt_log_flush_secs = sdp->sd_args.ar_commit;
	sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
	if (sdp->sd_args.ar_statfs_quantum) {
		sdp->sd_tune.gt_statfs_slow = 0;
		sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
	}
	else {
		sdp->sd_tune.gt_statfs_slow = 1;
		sdp->sd_tune.gt_statfs_quantum = 30;
	}

	error = init_names(sdp, silent);
	if (error)
		goto fail;

	gfs2_create_debugfs_file(sdp);

	error = gfs2_sys_fs_add(sdp);
	if (error)
		goto fail;

	error = gfs2_lm_mount(sdp, silent);
	if (error)
		goto fail_sys;

	error = init_locking(sdp, &mount_gh, DO);
	if (error)
		goto fail_lm;

	error = init_sb(sdp, silent);
	if (error)
		goto fail_locking;

	error = init_inodes(sdp, DO);
	if (error)
		goto fail_sb;

	error = init_per_node(sdp, DO);
	if (error)
		goto fail_inodes;

	error = gfs2_statfs_init(sdp);
	if (error) {
		fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
		goto fail_per_node;
	}

	error = init_threads(sdp, DO);
	if (error)
		goto fail_per_node;

	if (!(sb->s_flags & MS_RDONLY)) {
		error = gfs2_make_fs_rw(sdp);
		if (error) {
			fs_err(sdp, "can't make FS RW: %d\n", error);
			goto fail_threads;
		}
	}

	gfs2_glock_dq_uninit(&mount_gh);
	gfs2_online_uevent(sdp);
	return 0;

fail_threads:
	init_threads(sdp, UNDO);
fail_per_node:
	init_per_node(sdp, UNDO);
fail_inodes:
	init_inodes(sdp, UNDO);
fail_sb:
	if (sdp->sd_root_dir)
		dput(sdp->sd_root_dir);
	if (sdp->sd_master_dir)
		dput(sdp->sd_master_dir);
	if (sb->s_root)
		dput(sb->s_root);
	sb->s_root = NULL;
fail_locking:
	init_locking(sdp, &mount_gh, UNDO);
fail_lm:
	gfs2_gl_hash_clear(sdp);
	gfs2_lm_unmount(sdp);
	while (invalidate_inodes(sb))
		yield();
fail_sys:
	gfs2_sys_fs_del(sdp);
fail:
	gfs2_delete_debugfs_file(sdp);
	kfree(sdp);
	sb->s_fs_info = NULL;
	return error;
}

static int set_gfs2_super(struct super_block *s, void *data)
{
	s->s_bdev = data;
	s->s_dev = s->s_bdev->bd_dev;

	/*
	 * We set the bdi here to the queue backing, file systems can
	 * overwrite this in ->fill_super()
	 */
	s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
	return 0;
}

static int test_gfs2_super(struct super_block *s, void *ptr)
{
	struct block_device *bdev = ptr;
	return (bdev == s->s_bdev);
}

/**
 * gfs2_get_sb - Get the GFS2 superblock
 * @fs_type: The GFS2 filesystem type
 * @flags: Mount flags
 * @dev_name: The name of the device
 * @data: The mount arguments
 * @mnt: The vfsmnt for this mount
 *
 * Q. Why not use get_sb_bdev() ?
 * A. We need to select one of two root directories to mount, independent
 *    of whether this is the initial, or subsequent, mount of this sb
 *
 * Returns: 0 or -ve on error
 */

static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data, struct vfsmount *mnt)
{
	struct block_device *bdev;
	struct super_block *s;
	fmode_t mode = FMODE_READ;
	int error;
	struct gfs2_args args;
	struct gfs2_sbd *sdp;

	if (!(flags & MS_RDONLY))
		mode |= FMODE_WRITE;

	bdev = open_bdev_exclusive(dev_name, mode, fs_type);
	if (IS_ERR(bdev))
		return PTR_ERR(bdev);

	/*
	 * once the super is inserted into the list by sget, s_umount
	 * will protect the lockfs code from trying to start a snapshot
	 * while we are mounting
	 */
	mutex_lock(&bdev->bd_fsfreeze_mutex);
	if (bdev->bd_fsfreeze_count > 0) {
		mutex_unlock(&bdev->bd_fsfreeze_mutex);
		error = -EBUSY;
		goto error_bdev;
	}
	s = sget(fs_type, test_gfs2_super, set_gfs2_super, bdev);
	mutex_unlock(&bdev->bd_fsfreeze_mutex);
	error = PTR_ERR(s);
	if (IS_ERR(s))
		goto error_bdev;

	memset(&args, 0, sizeof(args));
	args.ar_quota = GFS2_QUOTA_DEFAULT;
	args.ar_data = GFS2_DATA_DEFAULT;
	args.ar_commit = 60;
	args.ar_statfs_quantum = 30;
	args.ar_quota_quantum = 60;
	args.ar_errors = GFS2_ERRORS_DEFAULT;

	error = gfs2_mount_args(&args, data);
	if (error) {
		printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
		if (s->s_root)
			goto error_super;
		deactivate_locked_super(s);
		return error;
	}

	if (s->s_root) {
		error = -EBUSY;
		if ((flags ^ s->s_flags) & MS_RDONLY)
			goto error_super;
		close_bdev_exclusive(bdev, mode);
	} else {
		char b[BDEVNAME_SIZE];

		s->s_flags = flags;
		s->s_mode = mode;
		strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
		sb_set_blocksize(s, block_size(bdev));
		error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
		if (error) {
			deactivate_locked_super(s);
			return error;
		}
		s->s_flags |= MS_ACTIVE;
		bdev->bd_super = s;
	}

	sdp = s->s_fs_info;
	mnt->mnt_sb = s;
	if (args.ar_meta)
		mnt->mnt_root = dget(sdp->sd_master_dir);
	else
		mnt->mnt_root = dget(sdp->sd_root_dir);
	return 0;

error_super:
	deactivate_locked_super(s);
error_bdev:
	close_bdev_exclusive(bdev, mode);
	return error;
}

static int set_meta_super(struct super_block *s, void *ptr)
{
	return -EINVAL;
}

static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
			    const char *dev_name, void *data, struct vfsmount *mnt)
{
	struct super_block *s;
	struct gfs2_sbd *sdp;
	struct path path;
	int error;

	error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
	if (error) {
		printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
		       dev_name, error);
		return error;
	}
	s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super,
		 path.dentry->d_inode->i_sb->s_bdev);
	path_put(&path);
	if (IS_ERR(s)) {
		printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
		return PTR_ERR(s);
	}
	if ((flags ^ s->s_flags) & MS_RDONLY) {
		deactivate_locked_super(s);
		return -EBUSY;
	}
	sdp = s->s_fs_info;
	mnt->mnt_sb = s;
	mnt->mnt_root = dget(sdp->sd_master_dir);
	return 0;
}

static void gfs2_kill_sb(struct super_block *sb)
{
	struct gfs2_sbd *sdp = sb->s_fs_info;

	if (sdp == NULL) {
		kill_block_super(sb);
		return;
	}

	gfs2_meta_syncfs(sdp);
	dput(sdp->sd_root_dir);
	dput(sdp->sd_master_dir);
	sdp->sd_root_dir = NULL;
	sdp->sd_master_dir = NULL;
	shrink_dcache_sb(sb);
	kill_block_super(sb);
	gfs2_delete_debugfs_file(sdp);
	kfree(sdp);
}

struct file_system_type gfs2_fs_type = {
	.name = "gfs2",
	.fs_flags = FS_REQUIRES_DEV,
	.get_sb = gfs2_get_sb,
	.kill_sb = gfs2_kill_sb,
	.owner = THIS_MODULE,
};

struct file_system_type gfs2meta_fs_type = {
	.name = "gfs2meta",
	.fs_flags = FS_REQUIRES_DEV,
	.get_sb = gfs2_get_sb_meta,
	.owner = THIS_MODULE,
};