summaryrefslogtreecommitdiff
path: root/fs/afs/internal.h
blob: 1627b1872812570da753f85c5fad8059245ad984 (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
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* internal AFS stuff
 *
 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/ktime.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/rxrpc.h>
#include <linux/key.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
#include <linux/fscache.h>
#include <linux/backing-dev.h>
#include <linux/uuid.h>
#include <linux/mm_types.h>
#include <linux/dns_resolver.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>

#include "afs.h"
#include "afs_vl.h"

#define AFS_CELL_MAX_ADDRS 15

struct pagevec;
struct afs_call;

/*
 * Partial file-locking emulation mode.  (The problem being that AFS3 only
 * allows whole-file locks and no upgrading/downgrading).
 */
enum afs_flock_mode {
	afs_flock_mode_unset,
	afs_flock_mode_local,	/* Local locking only */
	afs_flock_mode_openafs,	/* Don't get server lock for a partial lock */
	afs_flock_mode_strict,	/* Always get a server lock for a partial lock */
	afs_flock_mode_write,	/* Get an exclusive server lock for a partial lock */
};

struct afs_fs_context {
	bool			force;		/* T to force cell type */
	bool			autocell;	/* T if set auto mount operation */
	bool			dyn_root;	/* T if dynamic root */
	bool			no_cell;	/* T if the source is "none" (for dynroot) */
	enum afs_flock_mode	flock_mode;	/* Partial file-locking emulation mode */
	afs_voltype_t		type;		/* type of volume requested */
	unsigned int		volnamesz;	/* size of volume name */
	const char		*volname;	/* name of volume to mount */
	struct afs_net		*net;		/* the AFS net namespace stuff */
	struct afs_cell		*cell;		/* cell in which to find volume */
	struct afs_volume	*volume;	/* volume record */
	struct key		*key;		/* key to use for secure mounting */
};

enum afs_call_state {
	AFS_CALL_CL_REQUESTING,		/* Client: Request is being sent */
	AFS_CALL_CL_AWAIT_REPLY,	/* Client: Awaiting reply */
	AFS_CALL_CL_PROC_REPLY,		/* Client: rxrpc call complete; processing reply */
	AFS_CALL_SV_AWAIT_OP_ID,	/* Server: Awaiting op ID */
	AFS_CALL_SV_AWAIT_REQUEST,	/* Server: Awaiting request data */
	AFS_CALL_SV_REPLYING,		/* Server: Replying */
	AFS_CALL_SV_AWAIT_ACK,		/* Server: Awaiting final ACK */
	AFS_CALL_COMPLETE,		/* Completed or failed */
};

/*
 * List of server addresses.
 */
struct afs_addr_list {
	struct rcu_head		rcu;
	refcount_t		usage;
	u32			version;	/* Version */
	unsigned char		max_addrs;
	unsigned char		nr_addrs;
	unsigned char		preferred;	/* Preferred address */
	unsigned char		nr_ipv4;	/* Number of IPv4 addresses */
	enum dns_record_source	source:8;
	enum dns_lookup_status	status:8;
	unsigned long		failed;		/* Mask of addrs that failed locally/ICMP */
	unsigned long		responded;	/* Mask of addrs that responded */
	struct sockaddr_rxrpc	addrs[];
#define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8))
};

/*
 * a record of an in-progress RxRPC call
 */
struct afs_call {
	const struct afs_call_type *type;	/* type of call */
	struct afs_addr_list	*alist;		/* Address is alist[addr_ix] */
	wait_queue_head_t	waitq;		/* processes awaiting completion */
	struct work_struct	async_work;	/* async I/O processor */
	struct work_struct	work;		/* actual work processor */
	struct rxrpc_call	*rxcall;	/* RxRPC call handle */
	struct key		*key;		/* security for this call */
	struct afs_net		*net;		/* The network namespace */
	struct afs_server	*server;	/* The fileserver record if fs op (pins ref) */
	struct afs_vlserver	*vlserver;	/* The vlserver record if vl op */
	void			*request;	/* request data (first part) */
	struct iov_iter		def_iter;	/* Default buffer/data iterator */
	struct iov_iter		*iter;		/* Iterator currently in use */
	union {	/* Convenience for ->def_iter */
		struct kvec	kvec[1];
		struct bio_vec	bvec[1];
	};
	void			*buffer;	/* reply receive buffer */
	union {
		long			ret0;	/* Value to reply with instead of 0 */
		struct afs_addr_list	*ret_alist;
		struct afs_vldb_entry	*ret_vldb;
		char			*ret_str;
	};
	struct afs_operation	*op;
	unsigned int		server_index;
	atomic_t		usage;
	enum afs_call_state	state;
	spinlock_t		state_lock;
	int			error;		/* error code */
	u32			abort_code;	/* Remote abort ID or 0 */
	unsigned int		max_lifespan;	/* Maximum lifespan to set if not 0 */
	unsigned		request_size;	/* size of request data */
	unsigned		reply_max;	/* maximum size of reply */
	unsigned		count2;		/* count used in unmarshalling */
	unsigned char		unmarshall;	/* unmarshalling phase */
	unsigned char		addr_ix;	/* Address in ->alist */
	bool			drop_ref;	/* T if need to drop ref for incoming call */
	bool			send_pages;	/* T if data from mapping should be sent */
	bool			need_attention;	/* T if RxRPC poked us */
	bool			async;		/* T if asynchronous */
	bool			upgrade;	/* T to request service upgrade */
	bool			have_reply_time; /* T if have got reply_time */
	bool			intr;		/* T if interruptible */
	bool			unmarshalling_error; /* T if an unmarshalling error occurred */
	u16			service_id;	/* Actual service ID (after upgrade) */
	unsigned int		debug_id;	/* Trace ID */
	u32			operation_ID;	/* operation ID for an incoming call */
	u32			count;		/* count for use in unmarshalling */
	union {					/* place to extract temporary data */
		struct {
			__be32	tmp_u;
			__be32	tmp;
		} __attribute__((packed));
		__be64		tmp64;
	};
	ktime_t			reply_time;	/* Time of first reply packet */
};

struct afs_call_type {
	const char *name;
	unsigned int op; /* Really enum afs_fs_operation */

	/* deliver request or reply data to an call
	 * - returning an error will cause the call to be aborted
	 */
	int (*deliver)(struct afs_call *call);

	/* clean up a call */
	void (*destructor)(struct afs_call *call);

	/* Work function */
	void (*work)(struct work_struct *work);

	/* Call done function (gets called immediately on success or failure) */
	void (*done)(struct afs_call *call);
};

/*
 * Key available for writeback on a file.
 */
struct afs_wb_key {
	refcount_t		usage;
	struct key		*key;
	struct list_head	vnode_link;	/* Link in vnode->wb_keys */
};

/*
 * AFS open file information record.  Pointed to by file->private_data.
 */
struct afs_file {
	struct key		*key;		/* The key this file was opened with */
	struct afs_wb_key	*wb;		/* Writeback key record for this file */
};

static inline struct key *afs_file_key(struct file *file)
{
	struct afs_file *af = file->private_data;

	return af->key;
}

/*
 * Record of an outstanding read operation on a vnode.
 */
struct afs_read {
	loff_t			pos;		/* Where to start reading */
	loff_t			len;		/* How much we're asking for */
	loff_t			actual_len;	/* How much we're actually getting */
	loff_t			remain;		/* Amount remaining */
	loff_t			file_size;	/* File size returned by server */
	afs_dataversion_t	data_version;	/* Version number returned by server */
	refcount_t		usage;
	unsigned int		index;		/* Which page we're reading into */
	unsigned int		nr_pages;
	unsigned int		offset;		/* offset into current page */
	struct afs_vnode	*vnode;
	void (*page_done)(struct afs_read *);
	struct page		**pages;
	struct page		*array[];
};

/*
 * AFS superblock private data
 * - there's one superblock per volume
 */
struct afs_super_info {
	struct net		*net_ns;	/* Network namespace */
	struct afs_cell		*cell;		/* The cell in which the volume resides */
	struct afs_volume	*volume;	/* volume record */
	enum afs_flock_mode	flock_mode:8;	/* File locking emulation mode */
	bool			dyn_root;	/* True if dynamic root */
};

static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
{
	return sb->s_fs_info;
}

extern struct file_system_type afs_fs_type;

/*
 * Set of substitutes for @sys.
 */
struct afs_sysnames {
#define AFS_NR_SYSNAME 16
	char			*subs[AFS_NR_SYSNAME];
	refcount_t		usage;
	unsigned short		nr;
	char			blank[1];
};

/*
 * AFS network namespace record.
 */
struct afs_net {
	struct net		*net;		/* Backpointer to the owning net namespace */
	struct afs_uuid		uuid;
	bool			live;		/* F if this namespace is being removed */

	/* AF_RXRPC I/O stuff */
	struct socket		*socket;
	struct afs_call		*spare_incoming_call;
	struct work_struct	charge_preallocation_work;
	struct mutex		socket_mutex;
	atomic_t		nr_outstanding_calls;
	atomic_t		nr_superblocks;

	/* Cell database */
	struct rb_root		cells;
	struct afs_cell		*ws_cell;
	struct work_struct	cells_manager;
	struct timer_list	cells_timer;
	atomic_t		cells_outstanding;
	struct rw_semaphore	cells_lock;
	struct mutex		cells_alias_lock;

	struct mutex		proc_cells_lock;
	struct hlist_head	proc_cells;

	/* Known servers.  Theoretically each fileserver can only be in one
	 * cell, but in practice, people create aliases and subsets and there's
	 * no easy way to distinguish them.
	 */
	seqlock_t		fs_lock;	/* For fs_servers, fs_probe_*, fs_proc */
	struct rb_root		fs_servers;	/* afs_server (by server UUID or address) */
	struct list_head	fs_probe_fast;	/* List of afs_server to probe at 30s intervals */
	struct list_head	fs_probe_slow;	/* List of afs_server to probe at 5m intervals */
	struct hlist_head	fs_proc;	/* procfs servers list */

	struct hlist_head	fs_addresses4;	/* afs_server (by lowest IPv4 addr) */
	struct hlist_head	fs_addresses6;	/* afs_server (by lowest IPv6 addr) */
	seqlock_t		fs_addr_lock;	/* For fs_addresses[46] */

	struct work_struct	fs_manager;
	struct timer_list	fs_timer;

	struct work_struct	fs_prober;
	struct timer_list	fs_probe_timer;
	atomic_t		servers_outstanding;

	/* File locking renewal management */
	struct mutex		lock_manager_mutex;

	/* Misc */
	struct super_block	*dynroot_sb;	/* Dynamic root mount superblock */
	struct proc_dir_entry	*proc_afs;	/* /proc/net/afs directory */
	struct afs_sysnames	*sysnames;
	rwlock_t		sysnames_lock;

	/* Statistics counters */
	atomic_t		n_lookup;	/* Number of lookups done */
	atomic_t		n_reval;	/* Number of dentries needing revalidation */
	atomic_t		n_inval;	/* Number of invalidations by the server */
	atomic_t		n_relpg;	/* Number of invalidations by releasepage */
	atomic_t		n_read_dir;	/* Number of directory pages read */
	atomic_t		n_dir_cr;	/* Number of directory entry creation edits */
	atomic_t		n_dir_rm;	/* Number of directory entry removal edits */
	atomic_t		n_stores;	/* Number of store ops */
	atomic_long_t		n_store_bytes;	/* Number of bytes stored */
	atomic_long_t		n_fetch_bytes;	/* Number of bytes fetched */
	atomic_t		n_fetches;	/* Number of data fetch ops */
};

extern const char afs_init_sysname[];

enum afs_cell_state {
	AFS_CELL_UNSET,
	AFS_CELL_ACTIVATING,
	AFS_CELL_ACTIVE,
	AFS_CELL_DEACTIVATING,
	AFS_CELL_INACTIVE,
	AFS_CELL_FAILED,
	AFS_CELL_REMOVED,
};

/*
 * AFS cell record.
 *
 * This is a tricky concept to get right as it is possible to create aliases
 * simply by pointing AFSDB/SRV records for two names at the same set of VL
 * servers; it is also possible to do things like setting up two sets of VL
 * servers, one of which provides a superset of the volumes provided by the
 * other (for internal/external division, for example).
 *
 * Cells only exist in the sense that (a) a cell's name maps to a set of VL
 * servers and (b) a cell's name is used by the client to select the key to use
 * for authentication and encryption.  The cell name is not typically used in
 * the protocol.
 *
 * Two cells are determined to be aliases if they have an explicit alias (YFS
 * only), share any VL servers in common or have at least one volume in common.
 * "In common" means that the address list of the VL servers or the fileservers
 * share at least one endpoint.
 */
struct afs_cell {
	union {
		struct rcu_head	rcu;
		struct rb_node	net_node;	/* Node in net->cells */
	};
	struct afs_net		*net;
	struct afs_cell		*alias_of;	/* The cell this is an alias of */
	struct afs_volume	*root_volume;	/* The root.cell volume if there is one */
	struct key		*anonymous_key;	/* anonymous user key for this cell */
	struct work_struct	manager;	/* Manager for init/deinit/dns */
	struct hlist_node	proc_link;	/* /proc cell list link */
#ifdef CONFIG_AFS_FSCACHE
	struct fscache_cookie	*cache;		/* caching cookie */
#endif
	time64_t		dns_expiry;	/* Time AFSDB/SRV record expires */
	time64_t		last_inactive;	/* Time of last drop of usage count */
	atomic_t		ref;		/* Struct refcount */
	atomic_t		active;		/* Active usage counter */
	unsigned long		flags;
#define AFS_CELL_FL_NO_GC	0		/* The cell was added manually, don't auto-gc */
#define AFS_CELL_FL_DO_LOOKUP	1		/* DNS lookup requested */
#define AFS_CELL_FL_CHECK_ALIAS	2		/* Need to check for aliases */
	enum afs_cell_state	state;
	short			error;
	enum dns_record_source	dns_source:8;	/* Latest source of data from lookup */
	enum dns_lookup_status	dns_status:8;	/* Latest status of data from lookup */
	unsigned int		dns_lookup_count; /* Counter of DNS lookups */
	unsigned int		debug_id;

	/* The volumes belonging to this cell */
	struct rb_root		volumes;	/* Tree of volumes on this server */
	struct hlist_head	proc_volumes;	/* procfs volume list */
	seqlock_t		volume_lock;	/* For volumes */

	/* Active fileserver interaction state. */
	struct rb_root		fs_servers;	/* afs_server (by server UUID) */
	seqlock_t		fs_lock;	/* For fs_servers  */

	/* VL server list. */
	rwlock_t		vl_servers_lock; /* Lock on vl_servers */
	struct afs_vlserver_list __rcu *vl_servers;

	u8			name_len;	/* Length of name */
	char			*name;		/* Cell name, case-flattened and NUL-padded */
};

/*
 * Volume Location server record.
 */
struct afs_vlserver {
	struct rcu_head		rcu;
	struct afs_addr_list	__rcu *addresses; /* List of addresses for this VL server */
	unsigned long		flags;
#define AFS_VLSERVER_FL_PROBED	0		/* The VL server has been probed */
#define AFS_VLSERVER_FL_PROBING	1		/* VL server is being probed */
#define AFS_VLSERVER_FL_IS_YFS	2		/* Server is YFS not AFS */
#define AFS_VLSERVER_FL_RESPONDING 3		/* VL server is responding */
	rwlock_t		lock;		/* Lock on addresses */
	atomic_t		usage;
	unsigned int		rtt;		/* Server's current RTT in uS */

	/* Probe state */
	wait_queue_head_t	probe_wq;
	atomic_t		probe_outstanding;
	spinlock_t		probe_lock;
	struct {
		unsigned int	rtt;		/* RTT in uS */
		u32		abort_code;
		short		error;
		unsigned short	flags;
#define AFS_VLSERVER_PROBE_RESPONDED		0x01 /* At least once response (may be abort) */
#define AFS_VLSERVER_PROBE_IS_YFS		0x02 /* The peer appears to be YFS */
#define AFS_VLSERVER_PROBE_NOT_YFS		0x04 /* The peer appears not to be YFS */
#define AFS_VLSERVER_PROBE_LOCAL_FAILURE	0x08 /* A local failure prevented a probe */
	} probe;

	u16			port;
	u16			name_len;	/* Length of name */
	char			name[];		/* Server name, case-flattened */
};

/*
 * Weighted list of Volume Location servers.
 */
struct afs_vlserver_entry {
	u16			priority;	/* Preference (as SRV) */
	u16			weight;		/* Weight (as SRV) */
	enum dns_record_source	source:8;
	enum dns_lookup_status	status:8;
	struct afs_vlserver	*server;
};

struct afs_vlserver_list {
	struct rcu_head		rcu;
	atomic_t		usage;
	u8			nr_servers;
	u8			index;		/* Server currently in use */
	u8			preferred;	/* Preferred server */
	enum dns_record_source	source:8;
	enum dns_lookup_status	status:8;
	rwlock_t		lock;
	struct afs_vlserver_entry servers[];
};

/*
 * Cached VLDB entry.
 *
 * This is pointed to by cell->vldb_entries, indexed by name.
 */
struct afs_vldb_entry {
	afs_volid_t		vid[3];		/* Volume IDs for R/W, R/O and Bak volumes */

	unsigned long		flags;
#define AFS_VLDB_HAS_RW		0		/* - R/W volume exists */
#define AFS_VLDB_HAS_RO		1		/* - R/O volume exists */
#define AFS_VLDB_HAS_BAK	2		/* - Backup volume exists */
#define AFS_VLDB_QUERY_VALID	3		/* - Record is valid */
#define AFS_VLDB_QUERY_ERROR	4		/* - VL server returned error */

	uuid_t			fs_server[AFS_NMAXNSERVERS];
	u32			addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */
	u8			fs_mask[AFS_NMAXNSERVERS];
#define AFS_VOL_VTM_RW	0x01 /* R/W version of the volume is available (on this server) */
#define AFS_VOL_VTM_RO	0x02 /* R/O version of the volume is available (on this server) */
#define AFS_VOL_VTM_BAK	0x04 /* backup version of the volume is available (on this server) */
	short			error;
	u8			nr_servers;	/* Number of server records */
	u8			name_len;
	u8			name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
};

/*
 * Record of fileserver with which we're actively communicating.
 */
struct afs_server {
	struct rcu_head		rcu;
	union {
		uuid_t		uuid;		/* Server ID */
		struct afs_uuid	_uuid;
	};

	struct afs_addr_list	__rcu *addresses;
	struct afs_cell		*cell;		/* Cell to which belongs (pins ref) */
	struct rb_node		uuid_rb;	/* Link in net->fs_servers */
	struct afs_server __rcu	*uuid_next;	/* Next server with same UUID */
	struct afs_server	*uuid_prev;	/* Previous server with same UUID */
	struct list_head	probe_link;	/* Link in net->fs_probe_list */
	struct hlist_node	addr4_link;	/* Link in net->fs_addresses4 */
	struct hlist_node	addr6_link;	/* Link in net->fs_addresses6 */
	struct hlist_node	proc_link;	/* Link in net->fs_proc */
	struct afs_server	*gc_next;	/* Next server in manager's list */
	time64_t		unuse_time;	/* Time at which last unused */
	unsigned long		flags;
#define AFS_SERVER_FL_RESPONDING 0		/* The server is responding */
#define AFS_SERVER_FL_UPDATING	1
#define AFS_SERVER_FL_NEEDS_UPDATE 2		/* Fileserver address list is out of date */
#define AFS_SERVER_FL_NOT_READY	4		/* The record is not ready for use */
#define AFS_SERVER_FL_NOT_FOUND	5		/* VL server says no such server */
#define AFS_SERVER_FL_VL_FAIL	6		/* Failed to access VL server */
#define AFS_SERVER_FL_MAY_HAVE_CB 8		/* May have callbacks on this fileserver */
#define AFS_SERVER_FL_IS_YFS	16		/* Server is YFS not AFS */
#define AFS_SERVER_FL_NO_IBULK	17		/* Fileserver doesn't support FS.InlineBulkStatus */
#define AFS_SERVER_FL_NO_RM2	18		/* Fileserver doesn't support YFS.RemoveFile2 */
	atomic_t		ref;		/* Object refcount */
	atomic_t		active;		/* Active user count */
	u32			addr_version;	/* Address list version */
	unsigned int		rtt;		/* Server's current RTT in uS */
	unsigned int		debug_id;	/* Debugging ID for traces */

	/* file service access */
	rwlock_t		fs_lock;	/* access lock */

	/* callback promise management */
	unsigned		cb_s_break;	/* Break-everything counter. */

	/* Probe state */
	unsigned long		probed_at;	/* Time last probe was dispatched (jiffies) */
	wait_queue_head_t	probe_wq;
	atomic_t		probe_outstanding;
	spinlock_t		probe_lock;
	struct {
		unsigned int	rtt;		/* RTT in uS */
		u32		abort_code;
		short		error;
		bool		responded:1;
		bool		is_yfs:1;
		bool		not_yfs:1;
		bool		local_failure:1;
	} probe;
};

/*
 * Replaceable volume server list.
 */
struct afs_server_entry {
	struct afs_server	*server;
};

struct afs_server_list {
	afs_volid_t		vids[AFS_MAXTYPES]; /* Volume IDs */
	refcount_t		usage;
	unsigned char		nr_servers;
	unsigned char		preferred;	/* Preferred server */
	unsigned short		vnovol_mask;	/* Servers to be skipped due to VNOVOL */
	unsigned int		seq;		/* Set to ->servers_seq when installed */
	rwlock_t		lock;
	struct afs_server_entry	servers[];
};

/*
 * Live AFS volume management.
 */
struct afs_volume {
	union {
		struct rcu_head	rcu;
		afs_volid_t	vid;		/* volume ID */
	};
	atomic_t		usage;
	time64_t		update_at;	/* Time at which to next update */
	struct afs_cell		*cell;		/* Cell to which belongs (pins ref) */
	struct rb_node		cell_node;	/* Link in cell->volumes */
	struct hlist_node	proc_link;	/* Link in cell->proc_volumes */
	struct super_block __rcu *sb;		/* Superblock on which inodes reside */
	unsigned long		flags;
#define AFS_VOLUME_NEEDS_UPDATE	0	/* - T if an update needs performing */
#define AFS_VOLUME_UPDATING	1	/* - T if an update is in progress */
#define AFS_VOLUME_WAIT		2	/* - T if users must wait for update */
#define AFS_VOLUME_DELETED	3	/* - T if volume appears deleted */
#define AFS_VOLUME_OFFLINE	4	/* - T if volume offline notice given */
#define AFS_VOLUME_BUSY		5	/* - T if volume busy notice given */
#define AFS_VOLUME_MAYBE_NO_IBULK 6	/* - T if some servers don't have InlineBulkStatus */
#ifdef CONFIG_AFS_FSCACHE
	struct fscache_cookie	*cache;		/* caching cookie */
#endif
	struct afs_server_list __rcu *servers;	/* List of servers on which volume resides */
	rwlock_t		servers_lock;	/* Lock for ->servers */
	unsigned int		servers_seq;	/* Incremented each time ->servers changes */

	unsigned		cb_v_break;	/* Break-everything counter. */
	rwlock_t		cb_v_break_lock;

	afs_voltype_t		type;		/* type of volume */
	char			type_force;	/* force volume type (suppress R/O -> R/W) */
	u8			name_len;
	u8			name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
};

enum afs_lock_state {
	AFS_VNODE_LOCK_NONE,		/* The vnode has no lock on the server */
	AFS_VNODE_LOCK_WAITING_FOR_CB,	/* We're waiting for the server to break the callback */
	AFS_VNODE_LOCK_SETTING,		/* We're asking the server for a lock */
	AFS_VNODE_LOCK_GRANTED,		/* We have a lock on the server */
	AFS_VNODE_LOCK_EXTENDING,	/* We're extending a lock on the server */
	AFS_VNODE_LOCK_NEED_UNLOCK,	/* We need to unlock on the server */
	AFS_VNODE_LOCK_UNLOCKING,	/* We're telling the server to unlock */
	AFS_VNODE_LOCK_DELETED,		/* The vnode has been deleted whilst we have a lock */
};

/*
 * AFS inode private data.
 *
 * Note that afs_alloc_inode() *must* reset anything that could incorrectly
 * leak from one inode to another.
 */
struct afs_vnode {
	struct inode		vfs_inode;	/* the VFS's inode record */

	struct afs_volume	*volume;	/* volume on which vnode resides */
	struct afs_fid		fid;		/* the file identifier for this inode */
	struct afs_file_status	status;		/* AFS status info for this file */
	afs_dataversion_t	invalid_before;	/* Child dentries are invalid before this */
#ifdef CONFIG_AFS_FSCACHE
	struct fscache_cookie	*cache;		/* caching cookie */
#endif
	struct afs_permits __rcu *permit_cache;	/* cache of permits so far obtained */
	struct mutex		io_lock;	/* Lock for serialising I/O on this mutex */
	struct rw_semaphore	validate_lock;	/* lock for validating this vnode */
	struct rw_semaphore	rmdir_lock;	/* Lock for rmdir vs sillyrename */
	struct key		*silly_key;	/* Silly rename key */
	spinlock_t		wb_lock;	/* lock for wb_keys */
	spinlock_t		lock;		/* waitqueue/flags lock */
	unsigned long		flags;
#define AFS_VNODE_CB_PROMISED	0		/* Set if vnode has a callback promise */
#define AFS_VNODE_UNSET		1		/* set if vnode attributes not yet set */
#define AFS_VNODE_DIR_VALID	2		/* Set if dir contents are valid */
#define AFS_VNODE_ZAP_DATA	3		/* set if vnode's data should be invalidated */
#define AFS_VNODE_DELETED	4		/* set if vnode deleted on server */
#define AFS_VNODE_MOUNTPOINT	5		/* set if vnode is a mountpoint symlink */
#define AFS_VNODE_AUTOCELL	6		/* set if Vnode is an auto mount point */
#define AFS_VNODE_PSEUDODIR	7 		/* set if Vnode is a pseudo directory */
#define AFS_VNODE_NEW_CONTENT	8		/* Set if file has new content (create/trunc-0) */
#define AFS_VNODE_SILLY_DELETED	9		/* Set if file has been silly-deleted */

	struct list_head	wb_keys;	/* List of keys available for writeback */
	struct list_head	pending_locks;	/* locks waiting to be granted */
	struct list_head	granted_locks;	/* locks granted on this file */
	struct delayed_work	lock_work;	/* work to be done in locking */
	struct key		*lock_key;	/* Key to be used in lock ops */
	ktime_t			locked_at;	/* Time at which lock obtained */
	enum afs_lock_state	lock_state : 8;
	afs_lock_type_t		lock_type : 8;

	/* outstanding callback notification on this file */
	void			*cb_server;	/* Server with callback/filelock */
	unsigned int		cb_s_break;	/* Mass break counter on ->server */
	unsigned int		cb_v_break;	/* Mass break counter on ->volume */
	unsigned int		cb_break;	/* Break counter on vnode */
	seqlock_t		cb_lock;	/* Lock for ->cb_server, ->status, ->cb_*break */

	time64_t		cb_expires_at;	/* time at which callback expires */
};

static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
{
#ifdef CONFIG_AFS_FSCACHE
	return vnode->cache;
#else
	return NULL;
#endif
}

/*
 * cached security record for one user's attempt to access a vnode
 */
struct afs_permit {
	struct key		*key;		/* RxRPC ticket holding a security context */
	afs_access_t		access;		/* CallerAccess value for this key */
};

/*
 * Immutable cache of CallerAccess records from attempts to access vnodes.
 * These may be shared between multiple vnodes.
 */
struct afs_permits {
	struct rcu_head		rcu;
	struct hlist_node	hash_node;	/* Link in hash */
	unsigned long		h;		/* Hash value for this permit list */
	refcount_t		usage;
	unsigned short		nr_permits;	/* Number of records */
	bool			invalidated;	/* Invalidated due to key change */
	struct afs_permit	permits[];	/* List of permits sorted by key pointer */
};

/*
 * Error prioritisation and accumulation.
 */
struct afs_error {
	short	error;			/* Accumulated error */
	bool	responded;		/* T if server responded */
};

/*
 * Cursor for iterating over a server's address list.
 */
struct afs_addr_cursor {
	struct afs_addr_list	*alist;		/* Current address list (pins ref) */
	unsigned long		tried;		/* Tried addresses */
	signed char		index;		/* Current address */
	bool			responded;	/* T if the current address responded */
	unsigned short		nr_iterations;	/* Number of address iterations */
	short			error;
	u32			abort_code;
};

/*
 * Cursor for iterating over a set of volume location servers.
 */
struct afs_vl_cursor {
	struct afs_addr_cursor	ac;
	struct afs_cell		*cell;		/* The cell we're querying */
	struct afs_vlserver_list *server_list;	/* Current server list (pins ref) */
	struct afs_vlserver	*server;	/* Server on which this resides */
	struct key		*key;		/* Key for the server */
	unsigned long		untried;	/* Bitmask of untried servers */
	short			index;		/* Current server */
	short			error;
	unsigned short		flags;
#define AFS_VL_CURSOR_STOP	0x0001		/* Set to cease iteration */
#define AFS_VL_CURSOR_RETRY	0x0002		/* Set to do a retry */
#define AFS_VL_CURSOR_RETRIED	0x0004		/* Set if started a retry */
	unsigned short		nr_iterations;	/* Number of server iterations */
};

/*
 * Fileserver operation methods.
 */
struct afs_operation_ops {
	void (*issue_afs_rpc)(struct afs_operation *op);
	void (*issue_yfs_rpc)(struct afs_operation *op);
	void (*success)(struct afs_operation *op);
	void (*aborted)(struct afs_operation *op);
	void (*edit_dir)(struct afs_operation *op);
	void (*put)(struct afs_operation *op);
};

struct afs_vnode_param {
	struct afs_vnode	*vnode;
	struct afs_fid		fid;		/* Fid to access */
	struct afs_status_cb	scb;		/* Returned status and callback promise */
	afs_dataversion_t	dv_before;	/* Data version before the call */
	unsigned int		cb_break_before; /* cb_break + cb_s_break before the call */
	u8			dv_delta;	/* Expected change in data version */
	bool			put_vnode:1;	/* T if we have a ref on the vnode */
	bool			need_io_lock:1;	/* T if we need the I/O lock on this */
	bool			update_ctime:1;	/* Need to update the ctime */
	bool			set_size:1;	/* Must update i_size */
	bool			op_unlinked:1;	/* True if file was unlinked by op */
	bool			speculative:1;	/* T if speculative status fetch (no vnode lock) */
};

/*
 * Fileserver operation wrapper, handling server and address rotation
 * asynchronously.  May make simultaneous calls to multiple servers.
 */
struct afs_operation {
	struct afs_net		*net;		/* Network namespace */
	struct key		*key;		/* Key for the cell */
	const struct afs_call_type *type;	/* Type of call done */
	const struct afs_operation_ops *ops;

	/* Parameters/results for the operation */
	struct afs_volume	*volume;	/* Volume being accessed */
	struct afs_vnode_param	file[2];
	struct afs_vnode_param	*more_files;
	struct afs_volsync	volsync;
	struct dentry		*dentry;	/* Dentry to be altered */
	struct dentry		*dentry_2;	/* Second dentry to be altered */
	struct timespec64	mtime;		/* Modification time to record */
	struct timespec64	ctime;		/* Change time to set */
	short			nr_files;	/* Number of entries in file[], more_files */
	short			error;
	unsigned int		debug_id;

	unsigned int		cb_v_break;	/* Volume break counter before op */
	unsigned int		cb_s_break;	/* Server break counter before op */

	union {
		struct {
			int	which;		/* Which ->file[] to fetch for */
		} fetch_status;
		struct {
			int	reason;		/* enum afs_edit_dir_reason */
			mode_t	mode;
			const char *symlink;
		} create;
		struct {
			bool	need_rehash;
		} unlink;
		struct {
			struct dentry *rehash;
			struct dentry *tmp;
			bool	new_negative;
		} rename;
		struct {
			struct afs_read *req;
		} fetch;
		struct {
			afs_lock_type_t type;
		} lock;
		struct {
			struct address_space *mapping;	/* Pages being written from */
			pgoff_t		first;		/* first page in mapping to deal with */
			pgoff_t		last;		/* last page in mapping to deal with */
			unsigned	first_offset;	/* offset into mapping[first] */
			unsigned	last_to;	/* amount of mapping[last] */
			bool		laundering;	/* Laundering page, PG_writeback not set */
		} store;
		struct {
			struct iattr	*attr;
			loff_t		old_i_size;
		} setattr;
		struct afs_acl	*acl;
		struct yfs_acl	*yacl;
		struct {
			struct afs_volume_status vs;
			struct kstatfs		*buf;
		} volstatus;
	};

	/* Fileserver iteration state */
	struct afs_addr_cursor	ac;
	struct afs_server_list	*server_list;	/* Current server list (pins ref) */
	struct afs_server	*server;	/* Server we're using (ref pinned by server_list) */
	struct afs_call		*call;
	unsigned long		untried;	/* Bitmask of untried servers */
	short			index;		/* Current server */
	unsigned short		nr_iterations;	/* Number of server iterations */

	unsigned int		flags;
#define AFS_OPERATION_STOP		0x0001	/* Set to cease iteration */
#define AFS_OPERATION_VBUSY		0x0002	/* Set if seen VBUSY */
#define AFS_OPERATION_VMOVED		0x0004	/* Set if seen VMOVED */
#define AFS_OPERATION_VNOVOL		0x0008	/* Set if seen VNOVOL */
#define AFS_OPERATION_CUR_ONLY		0x0010	/* Set if current server only (file lock held) */
#define AFS_OPERATION_NO_VSLEEP		0x0020	/* Set to prevent sleep on VBUSY, VOFFLINE, ... */
#define AFS_OPERATION_UNINTR		0x0040	/* Set if op is uninterruptible */
#define AFS_OPERATION_DOWNGRADE		0x0080	/* Set to retry with downgraded opcode */
#define AFS_OPERATION_LOCK_0		0x0100	/* Set if have io_lock on file[0] */
#define AFS_OPERATION_LOCK_1		0x0200	/* Set if have io_lock on file[1] */
#define AFS_OPERATION_TRIED_ALL		0x0400	/* Set if we've tried all the fileservers */
#define AFS_OPERATION_RETRY_SERVER	0x0800	/* Set if we should retry the current server */
#define AFS_OPERATION_DIR_CONFLICT	0x1000	/* Set if we detected a 3rd-party dir change */
};

/*
 * Cache auxiliary data.
 */
struct afs_vnode_cache_aux {
	u64			data_version;
} __packed;

/*
 * We use page->private to hold the amount of the page that we've written to,
 * splitting the field into two parts.  However, we need to represent a range
 * 0...PAGE_SIZE, so we reduce the resolution if the size of the page
 * exceeds what we can encode.
 */
#ifdef CONFIG_64BIT
#define __AFS_PAGE_PRIV_MASK	0x7fffffffUL
#define __AFS_PAGE_PRIV_SHIFT	32
#define __AFS_PAGE_PRIV_MMAPPED	0x80000000UL
#else
#define __AFS_PAGE_PRIV_MASK	0x7fffUL
#define __AFS_PAGE_PRIV_SHIFT	16
#define __AFS_PAGE_PRIV_MMAPPED	0x8000UL
#endif

static inline unsigned int afs_page_dirty_resolution(void)
{
	int shift = PAGE_SHIFT - (__AFS_PAGE_PRIV_SHIFT - 1);
	return (shift > 0) ? shift : 0;
}

static inline size_t afs_page_dirty_from(unsigned long priv)
{
	unsigned long x = priv & __AFS_PAGE_PRIV_MASK;

	/* The lower bound is inclusive */
	return x << afs_page_dirty_resolution();
}

static inline size_t afs_page_dirty_to(unsigned long priv)
{
	unsigned long x = (priv >> __AFS_PAGE_PRIV_SHIFT) & __AFS_PAGE_PRIV_MASK;

	/* The upper bound is immediately beyond the region */
	return (x + 1) << afs_page_dirty_resolution();
}

static inline unsigned long afs_page_dirty(size_t from, size_t to)
{
	unsigned int res = afs_page_dirty_resolution();
	from >>= res;
	to = (to - 1) >> res;
	return (to << __AFS_PAGE_PRIV_SHIFT) | from;
}

static inline unsigned long afs_page_dirty_mmapped(unsigned long priv)
{
	return priv | __AFS_PAGE_PRIV_MMAPPED;
}

static inline bool afs_is_page_dirty_mmapped(unsigned long priv)
{
	return priv & __AFS_PAGE_PRIV_MMAPPED;
}

#include <trace/events/afs.h>

/*****************************************************************************/
/*
 * addr_list.c
 */
static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist)
{
	if (alist)
		refcount_inc(&alist->usage);
	return alist;
}
extern struct afs_addr_list *afs_alloc_addrlist(unsigned int,
						unsigned short,
						unsigned short);
extern void afs_put_addrlist(struct afs_addr_list *);
extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
						      const char *, size_t, char,
						      unsigned short, unsigned short);
extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
extern bool afs_iterate_addresses(struct afs_addr_cursor *);
extern int afs_end_cursor(struct afs_addr_cursor *);

extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16);
extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16);

/*
 * cache.c
 */
#ifdef CONFIG_AFS_FSCACHE
extern struct fscache_netfs afs_cache_netfs;
extern struct fscache_cookie_def afs_cell_cache_index_def;
extern struct fscache_cookie_def afs_volume_cache_index_def;
extern struct fscache_cookie_def afs_vnode_cache_index_def;
#else
#define afs_cell_cache_index_def	(*(struct fscache_cookie_def *) NULL)
#define afs_volume_cache_index_def	(*(struct fscache_cookie_def *) NULL)
#define afs_vnode_cache_index_def	(*(struct fscache_cookie_def *) NULL)
#endif

/*
 * callback.c
 */
extern void afs_init_callback_state(struct afs_server *);
extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);

static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
{
	return vnode->cb_break + vnode->cb_v_break;
}

static inline bool afs_cb_is_broken(unsigned int cb_break,
				    const struct afs_vnode *vnode)
{
	return cb_break != (vnode->cb_break + vnode->volume->cb_v_break);
}

/*
 * cell.c
 */
extern int afs_cell_init(struct afs_net *, const char *);
extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
				      enum afs_cell_trace);
extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
					const char *, bool);
extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace);
extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_manage_cells(struct work_struct *);
extern void afs_cells_timer(struct timer_list *);
extern void __net_exit afs_cell_purge(struct afs_net *);

/*
 * cmservice.c
 */
extern bool afs_cm_incoming_call(struct afs_call *);

/*
 * dir.c
 */
extern const struct file_operations afs_dir_file_operations;
extern const struct inode_operations afs_dir_inode_operations;
extern const struct address_space_operations afs_dir_aops;
extern const struct dentry_operations afs_fs_dentry_operations;

extern void afs_d_release(struct dentry *);
extern void afs_check_for_remote_deletion(struct afs_operation *);

/*
 * dir_edit.c
 */
extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
			     enum afs_edit_dir_reason);
extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);

/*
 * dir_silly.c
 */
extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
			   struct dentry *, struct key *);
extern int afs_silly_iput(struct dentry *, struct inode *);

/*
 * dynroot.c
 */
extern const struct inode_operations afs_dynroot_inode_operations;
extern const struct dentry_operations afs_dynroot_dentry_operations;

extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *);
extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *);
extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *);
extern int afs_dynroot_populate(struct super_block *);
extern void afs_dynroot_depopulate(struct super_block *);

/*
 * file.c
 */
extern const struct address_space_operations afs_fs_aops;
extern const struct inode_operations afs_file_inode_operations;
extern const struct file_operations afs_file_operations;

extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
extern void afs_put_wb_key(struct afs_wb_key *);
extern int afs_open(struct inode *, struct file *);
extern int afs_release(struct inode *, struct file *);
extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *);
extern int afs_page_filler(void *, struct page *);
extern void afs_put_read(struct afs_read *);

static inline struct afs_read *afs_get_read(struct afs_read *req)
{
	refcount_inc(&req->usage);
	return req;
}

/*
 * flock.c
 */
extern struct workqueue_struct *afs_lock_manager;

extern void afs_lock_op_done(struct afs_call *);
extern void afs_lock_work(struct work_struct *);
extern void afs_lock_may_be_available(struct afs_vnode *);
extern int afs_lock(struct file *, int, struct file_lock *);
extern int afs_flock(struct file *, int, struct file_lock *);

/*
 * fsclient.c
 */
extern void afs_fs_fetch_status(struct afs_operation *);
extern void afs_fs_fetch_data(struct afs_operation *);
extern void afs_fs_create_file(struct afs_operation *);
extern void afs_fs_make_dir(struct afs_operation *);
extern void afs_fs_remove_file(struct afs_operation *);
extern void afs_fs_remove_dir(struct afs_operation *);
extern void afs_fs_link(struct afs_operation *);
extern void afs_fs_symlink(struct afs_operation *);
extern void afs_fs_rename(struct afs_operation *);
extern void afs_fs_store_data(struct afs_operation *);
extern void afs_fs_setattr(struct afs_operation *);
extern void afs_fs_get_volume_status(struct afs_operation *);
extern void afs_fs_set_lock(struct afs_operation *);
extern void afs_fs_extend_lock(struct afs_operation *);
extern void afs_fs_release_lock(struct afs_operation *);
extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *,
					struct afs_addr_cursor *, struct key *);
extern bool afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
				    struct afs_addr_cursor *, struct key *);
extern void afs_fs_inline_bulk_status(struct afs_operation *);

struct afs_acl {
	u32	size;
	u8	data[];
};

extern void afs_fs_fetch_acl(struct afs_operation *);
extern void afs_fs_store_acl(struct afs_operation *);

/*
 * fs_operation.c
 */
extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
extern int afs_put_operation(struct afs_operation *);
extern bool afs_begin_vnode_operation(struct afs_operation *);
extern void afs_wait_for_operation(struct afs_operation *);
extern int afs_do_sync_operation(struct afs_operation *);

static inline void afs_op_nomem(struct afs_operation *op)
{
	op->error = -ENOMEM;
}

static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
				    struct afs_vnode *vnode)
{
	op->file[n].vnode = vnode;
	op->file[n].need_io_lock = true;
}

static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
				  const struct afs_fid *fid)
{
	op->file[n].fid = *fid;
}

/*
 * fs_probe.c
 */
extern void afs_fileserver_probe_result(struct afs_call *);
extern void afs_fs_probe_fileserver(struct afs_net *, struct afs_server *, struct key *, bool);
extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long);
extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
extern void afs_fs_probe_dispatcher(struct work_struct *);
extern int afs_wait_for_one_fs_probe(struct afs_server *, bool);
extern void afs_fs_probe_cleanup(struct afs_net *);

/*
 * inode.c
 */
extern const struct afs_operation_ops afs_fetch_status_operation;

extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
extern int afs_ilookup5_test_by_fid(struct inode *, void *);
extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
extern struct inode *afs_root_iget(struct super_block *, struct key *);
extern bool afs_check_validity(struct afs_vnode *);
extern int afs_validate(struct afs_vnode *, struct key *);
extern int afs_getattr(struct user_namespace *mnt_userns, const struct path *,
		       struct kstat *, u32, unsigned int);
extern int afs_setattr(struct user_namespace *mnt_userns, struct dentry *, struct iattr *);
extern void afs_evict_inode(struct inode *);
extern int afs_drop_inode(struct inode *);

/*
 * main.c
 */
extern struct workqueue_struct *afs_wq;
extern int afs_net_id;

static inline struct afs_net *afs_net(struct net *net)
{
	return net_generic(net, afs_net_id);
}

static inline struct afs_net *afs_sb2net(struct super_block *sb)
{
	return afs_net(AFS_FS_S(sb)->net_ns);
}

static inline struct afs_net *afs_d2net(struct dentry *dentry)
{
	return afs_sb2net(dentry->d_sb);
}

static inline struct afs_net *afs_i2net(struct inode *inode)
{
	return afs_sb2net(inode->i_sb);
}

static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
{
	return afs_i2net(&vnode->vfs_inode);
}

static inline struct afs_net *afs_sock2net(struct sock *sk)
{
	return net_generic(sock_net(sk), afs_net_id);
}

static inline void __afs_stat(atomic_t *s)
{
	atomic_inc(s);
}

#define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)

/*
 * misc.c
 */
extern int afs_abort_to_error(u32);
extern void afs_prioritise_error(struct afs_error *, int, u32);

/*
 * mntpt.c
 */
extern const struct inode_operations afs_mntpt_inode_operations;
extern const struct inode_operations afs_autocell_inode_operations;
extern const struct file_operations afs_mntpt_file_operations;

extern struct vfsmount *afs_d_automount(struct path *);
extern void afs_mntpt_kill_timer(void);

/*
 * proc.c
 */
#ifdef CONFIG_PROC_FS
extern int __net_init afs_proc_init(struct afs_net *);
extern void __net_exit afs_proc_cleanup(struct afs_net *);
extern int afs_proc_cell_setup(struct afs_cell *);
extern void afs_proc_cell_remove(struct afs_cell *);
extern void afs_put_sysnames(struct afs_sysnames *);
#else
static inline int afs_proc_init(struct afs_net *net) { return 0; }
static inline void afs_proc_cleanup(struct afs_net *net) {}
static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
#endif

/*
 * rotate.c
 */
extern bool afs_select_fileserver(struct afs_operation *);
extern void afs_dump_edestaddrreq(const struct afs_operation *);

/*
 * rxrpc.c
 */
extern struct workqueue_struct *afs_async_calls;

extern int __net_init afs_open_socket(struct afs_net *);
extern void __net_exit afs_close_socket(struct afs_net *);
extern void afs_charge_preallocation(struct work_struct *);
extern void afs_put_call(struct afs_call *);
extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t);
extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
					    const struct afs_call_type *,
					    size_t, size_t);
extern void afs_flat_call_destructor(struct afs_call *);
extern void afs_send_empty_reply(struct afs_call *);
extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
extern int afs_extract_data(struct afs_call *, bool);
extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);

static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
				    gfp_t gfp)
{
	op->call = call;
	op->type = call->type;
	call->op = op;
	call->key = op->key;
	call->intr = !(op->flags & AFS_OPERATION_UNINTR);
	afs_make_call(&op->ac, call, gfp);
}

static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
{
	call->kvec[0].iov_base = buf;
	call->kvec[0].iov_len = size;
	iov_iter_kvec(&call->def_iter, READ, call->kvec, 1, size);
}

static inline void afs_extract_to_tmp(struct afs_call *call)
{
	afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
}

static inline void afs_extract_to_tmp64(struct afs_call *call)
{
	afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
}

static inline void afs_extract_discard(struct afs_call *call, size_t size)
{
	iov_iter_discard(&call->def_iter, READ, size);
}

static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
{
	afs_extract_begin(call, call->buffer, size);
}

static inline int afs_transfer_reply(struct afs_call *call)
{
	return afs_extract_data(call, false);
}

static inline bool afs_check_call_state(struct afs_call *call,
					enum afs_call_state state)
{
	return READ_ONCE(call->state) == state;
}

static inline bool afs_set_call_state(struct afs_call *call,
				      enum afs_call_state from,
				      enum afs_call_state to)
{
	bool ok = false;

	spin_lock_bh(&call->state_lock);
	if (call->state == from) {
		call->state = to;
		trace_afs_call_state(call, from, to, 0, 0);
		ok = true;
	}
	spin_unlock_bh(&call->state_lock);
	return ok;
}

static inline void afs_set_call_complete(struct afs_call *call,
					 int error, u32 remote_abort)
{
	enum afs_call_state state;
	bool ok = false;

	spin_lock_bh(&call->state_lock);
	state = call->state;
	if (state != AFS_CALL_COMPLETE) {
		call->abort_code = remote_abort;
		call->error = error;
		call->state = AFS_CALL_COMPLETE;
		trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
				     error, remote_abort);
		ok = true;
	}
	spin_unlock_bh(&call->state_lock);
	if (ok) {
		trace_afs_call_done(call);

		/* Asynchronous calls have two refs to release - one from the alloc and
		 * one queued with the work item - and we can't just deallocate the
		 * call because the work item may be queued again.
		 */
		if (call->drop_ref)
			afs_put_call(call);
	}
}

/*
 * security.c
 */
extern void afs_put_permits(struct afs_permits *);
extern void afs_clear_permits(struct afs_vnode *);
extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
			     struct afs_status_cb *);
extern void afs_zap_permits(struct rcu_head *);
extern struct key *afs_request_key(struct afs_cell *);
extern struct key *afs_request_key_rcu(struct afs_cell *);
extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
extern int afs_permission(struct user_namespace *, struct inode *, int);
extern void __exit afs_clean_up_permit_cache(void);

/*
 * server.c
 */
extern spinlock_t afs_server_peer_lock;

extern struct afs_server *afs_find_server(struct afs_net *,
					  const struct sockaddr_rxrpc *);
extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32);
extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace);
extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace);
extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
extern void afs_manage_servers(struct work_struct *);
extern void afs_servers_timer(struct timer_list *);
extern void afs_fs_probe_timer(struct timer_list *);
extern void __net_exit afs_purge_servers(struct afs_net *);
extern bool afs_check_server_record(struct afs_operation *, struct afs_server *);

static inline void afs_inc_servers_outstanding(struct afs_net *net)
{
	atomic_inc(&net->servers_outstanding);
}

static inline void afs_dec_servers_outstanding(struct afs_net *net)
{
	if (atomic_dec_and_test(&net->servers_outstanding))
		wake_up_var(&net->servers_outstanding);
}

static inline bool afs_is_probing_server(struct afs_server *server)
{
	return list_empty(&server->probe_link);
}

/*
 * server_list.c
 */
static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
{
	refcount_inc(&slist->usage);
	return slist;
}

extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *,
						     struct afs_vldb_entry *,
						     u8);
extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);

/*
 * super.c
 */
extern int __init afs_fs_init(void);
extern void afs_fs_exit(void);

/*
 * vlclient.c
 */
extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
							 const char *, int);
extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *,
						struct key *, struct afs_vlserver *, unsigned int);
extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);

/*
 * vl_alias.c
 */
extern int afs_cell_detect_alias(struct afs_cell *, struct key *);

/*
 * vl_probe.c
 */
extern void afs_vlserver_probe_result(struct afs_call *);
extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);

/*
 * vl_rotate.c
 */
extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
					 struct afs_cell *, struct key *);
extern bool afs_select_vlserver(struct afs_vl_cursor *);
extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
extern int afs_end_vlserver_operation(struct afs_vl_cursor *);

/*
 * vlserver_list.c
 */
static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
{
	atomic_inc(&vlserver->usage);
	return vlserver;
}

static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
{
	if (vllist)
		atomic_inc(&vllist->usage);
	return vllist;
}

extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
							   const void *, size_t);

/*
 * volume.c
 */
extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
extern void afs_activate_volume(struct afs_volume *);
extern void afs_deactivate_volume(struct afs_volume *);
extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
extern void afs_put_volume(struct afs_net *, struct afs_volume *, enum afs_volume_trace);
extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);

/*
 * write.c
 */
extern int afs_set_page_dirty(struct page *);
extern int afs_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata);
extern int afs_write_end(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *page, void *fsdata);
extern int afs_writepage(struct page *, struct writeback_control *);
extern int afs_writepages(struct address_space *, struct writeback_control *);
extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
extern int afs_fsync(struct file *, loff_t, loff_t, int);
extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
extern void afs_prune_wb_keys(struct afs_vnode *);
extern int afs_launder_page(struct page *);

/*
 * xattr.c
 */
extern const struct xattr_handler *afs_xattr_handlers[];

/*
 * yfsclient.c
 */
extern void yfs_fs_fetch_data(struct afs_operation *);
extern void yfs_fs_create_file(struct afs_operation *);
extern void yfs_fs_make_dir(struct afs_operation *);
extern void yfs_fs_remove_file2(struct afs_operation *);
extern void yfs_fs_remove_file(struct afs_operation *);
extern void yfs_fs_remove_dir(struct afs_operation *);
extern void yfs_fs_link(struct afs_operation *);
extern void yfs_fs_symlink(struct afs_operation *);
extern void yfs_fs_rename(struct afs_operation *);
extern void yfs_fs_store_data(struct afs_operation *);
extern void yfs_fs_setattr(struct afs_operation *);
extern void yfs_fs_get_volume_status(struct afs_operation *);
extern void yfs_fs_set_lock(struct afs_operation *);
extern void yfs_fs_extend_lock(struct afs_operation *);
extern void yfs_fs_release_lock(struct afs_operation *);
extern void yfs_fs_fetch_status(struct afs_operation *);
extern void yfs_fs_inline_bulk_status(struct afs_operation *);

struct yfs_acl {
	struct afs_acl	*acl;		/* Dir/file/symlink ACL */
	struct afs_acl	*vol_acl;	/* Whole volume ACL */
	u32		inherit_flag;	/* True if ACL is inherited from parent dir */
	u32		num_cleaned;	/* Number of ACEs removed due to subject removal */
	unsigned int	flags;
#define YFS_ACL_WANT_ACL	0x01	/* Set if caller wants ->acl */
#define YFS_ACL_WANT_VOL_ACL	0x02	/* Set if caller wants ->vol_acl */
};

extern void yfs_free_opaque_acl(struct yfs_acl *);
extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
extern void yfs_fs_store_opaque_acl2(struct afs_operation *);

/*
 * Miscellaneous inline functions.
 */
static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
{
	return container_of(inode, struct afs_vnode, vfs_inode);
}

static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
{
	return &vnode->vfs_inode;
}

/*
 * Note that a dentry got changed.  We need to set d_fsdata to the data version
 * number derived from the result of the operation.  It doesn't matter if
 * d_fsdata goes backwards as we'll just revalidate.
 */
static inline void afs_update_dentry_version(struct afs_operation *op,
					     struct afs_vnode_param *dir_vp,
					     struct dentry *dentry)
{
	if (!op->error)
		dentry->d_fsdata =
			(void *)(unsigned long)dir_vp->scb.status.data_version;
}

/*
 * Check for a conflicting operation on a directory that we just unlinked from.
 * If someone managed to sneak a link or an unlink in on the file we just
 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
 */
static inline void afs_check_dir_conflict(struct afs_operation *op,
					  struct afs_vnode_param *dvp)
{
	if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
		op->flags |= AFS_OPERATION_DIR_CONFLICT;
}

static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
{
	trace_afs_io_error(call->debug_id, -EIO, where);
	return -EIO;
}

static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
{
	trace_afs_file_error(vnode, -EIO, where);
	return -EIO;
}

/*****************************************************************************/
/*
 * debug tracing
 */
extern unsigned afs_debug;

#define dbgprintk(FMT,...) \
	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)

#define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
#define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
#define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)


#if defined(__KDEBUG)
#define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
#define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
#define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)

#elif defined(CONFIG_AFS_DEBUG)
#define AFS_DEBUG_KENTER	0x01
#define AFS_DEBUG_KLEAVE	0x02
#define AFS_DEBUG_KDEBUG	0x04

#define _enter(FMT,...)					\
do {							\
	if (unlikely(afs_debug & AFS_DEBUG_KENTER))	\
		kenter(FMT,##__VA_ARGS__);		\
} while (0)

#define _leave(FMT,...)					\
do {							\
	if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))	\
		kleave(FMT,##__VA_ARGS__);		\
} while (0)

#define _debug(FMT,...)					\
do {							\
	if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))	\
		kdebug(FMT,##__VA_ARGS__);		\
} while (0)

#else
#define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
#define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
#define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
#endif

/*
 * debug assertion checking
 */
#if 1 // defined(__KDEBUGALL)

#define ASSERT(X)						\
do {								\
	if (unlikely(!(X))) {					\
		printk(KERN_ERR "\n");				\
		printk(KERN_ERR "AFS: Assertion failed\n");	\
		BUG();						\
	}							\
} while(0)

#define ASSERTCMP(X, OP, Y)						\
do {									\
	if (unlikely(!((X) OP (Y)))) {					\
		printk(KERN_ERR "\n");					\
		printk(KERN_ERR "AFS: Assertion failed\n");		\
		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
		       (unsigned long)(X), (unsigned long)(Y));		\
		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
		       (unsigned long)(X), (unsigned long)(Y));		\
		BUG();							\
	}								\
} while(0)

#define ASSERTRANGE(L, OP1, N, OP2, H)					\
do {									\
	if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {		\
		printk(KERN_ERR "\n");					\
		printk(KERN_ERR "AFS: Assertion failed\n");		\
		printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n",	\
		       (unsigned long)(L), (unsigned long)(N),		\
		       (unsigned long)(H));				\
		printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
		       (unsigned long)(L), (unsigned long)(N),		\
		       (unsigned long)(H));				\
		BUG();							\
	}								\
} while(0)

#define ASSERTIF(C, X)						\
do {								\
	if (unlikely((C) && !(X))) {				\
		printk(KERN_ERR "\n");				\
		printk(KERN_ERR "AFS: Assertion failed\n");	\
		BUG();						\
	}							\
} while(0)

#define ASSERTIFCMP(C, X, OP, Y)					\
do {									\
	if (unlikely((C) && !((X) OP (Y)))) {				\
		printk(KERN_ERR "\n");					\
		printk(KERN_ERR "AFS: Assertion failed\n");		\
		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
		       (unsigned long)(X), (unsigned long)(Y));		\
		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
		       (unsigned long)(X), (unsigned long)(Y));		\
		BUG();							\
	}								\
} while(0)

#else

#define ASSERT(X)				\
do {						\
} while(0)

#define ASSERTCMP(X, OP, Y)			\
do {						\
} while(0)

#define ASSERTRANGE(L, OP1, N, OP2, H)		\
do {						\
} while(0)

#define ASSERTIF(C, X)				\
do {						\
} while(0)

#define ASSERTIFCMP(C, X, OP, Y)		\
do {						\
} while(0)

#endif /* __KDEBUGALL */