summaryrefslogtreecommitdiffstats
path: root/fs/cifs/cifsglob.h
blob: 340dce0ed07b1397e09a8203a90c63dbeba3fd03 (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
/*
 *   fs/cifs/cifsglob.h
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2008
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *              Jeremy Allison (jra@samba.org)
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 */
#ifndef _CIFS_GLOB_H
#define _CIFS_GLOB_H

#include <linux/in.h>
#include <linux/in6.h>
#include <linux/slab.h>
#include <linux/mempool.h>
#include <linux/workqueue.h>
#include "cifs_fs_sb.h"
#include "cifsacl.h"
#include <crypto/internal/hash.h>
#include <linux/scatterlist.h>

/*
 * The sizes of various internal tables and strings
 */
#define MAX_UID_INFO 16
#define MAX_SES_INFO 2
#define MAX_TCON_INFO 4

#define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1)
#define MAX_SERVER_SIZE 15
#define MAX_SHARE_SIZE 80
#define MAX_USERNAME_SIZE 256	/* reasonable maximum for current servers */
#define MAX_PASSWORD_SIZE 512	/* max for windows seems to be 256 wide chars */

#define CIFS_MIN_RCV_POOL 4

#define MAX_REOPEN_ATT	5 /* these many maximum attempts to reopen a file */
/*
 * default attribute cache timeout (jiffies)
 */
#define CIFS_DEF_ACTIMEO (1 * HZ)

/*
 * max attribute cache timeout (jiffies) - 2^30
 */
#define CIFS_MAX_ACTIMEO (1 << 30)

/*
 * MAX_REQ is the maximum number of requests that WE will send
 * on one socket concurrently.
 */
#define CIFS_MAX_REQ 32767

#define RFC1001_NAME_LEN 15
#define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)

/* currently length of NIP6_FMT */
#define SERVER_NAME_LENGTH 40
#define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)

/* used to define string lengths for reversing unicode strings */
/*         (256+1)*2 = 514                                     */
/*           (max path length + 1 for null) * 2 for unicode    */
#define MAX_NAME 514

#include "cifspdu.h"

#ifndef XATTR_DOS_ATTRIB
#define XATTR_DOS_ATTRIB "user.DOSATTRIB"
#endif

/*
 * CIFS vfs client Status information (based on what we know.)
 */

/* associated with each tcp and smb session */
enum statusEnum {
	CifsNew = 0,
	CifsGood,
	CifsExiting,
	CifsNeedReconnect,
	CifsNeedNegotiate
};

enum securityEnum {
	LANMAN = 0,			/* Legacy LANMAN auth */
	NTLM,			/* Legacy NTLM012 auth with NTLM hash */
	NTLMv2,			/* Legacy NTLM auth with NTLMv2 hash */
	RawNTLMSSP,		/* NTLMSSP without SPNEGO, NTLMv2 hash */
/*	NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
	Kerberos,		/* Kerberos via SPNEGO */
};

enum protocolEnum {
	TCP = 0,
	SCTP
	/* Netbios frames protocol not supported at this time */
};

struct session_key {
	unsigned int len;
	char *response;
};

/* crypto security descriptor definition */
struct sdesc {
	struct shash_desc shash;
	char ctx[];
};

/* crypto hashing related structure/fields, not specific to a sec mech */
struct cifs_secmech {
	struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
	struct crypto_shash *md5; /* md5 hash function */
	struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
	struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
};

/* per smb session structure/fields */
struct ntlmssp_auth {
	__u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
	__u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
	unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
	char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
};

struct cifs_cred {
	int uid;
	int gid;
	int mode;
	int cecount;
	struct cifs_sid osid;
	struct cifs_sid gsid;
	struct cifs_ntace *ntaces;
	struct cifs_ace *aces;
};

/*
 *****************************************************************
 * Except the CIFS PDUs themselves all the
 * globally interesting structs should go here
 *****************************************************************
 */

enum smb_version {
	Smb_1 = 1,
	Smb_21,
};

struct mid_q_entry;
struct TCP_Server_Info;
struct cifsFileInfo;
struct cifs_ses;
struct cifs_tcon;
struct dfs_info3_param;
struct cifs_fattr;
struct smb_vol;

struct smb_version_operations {
	int (*send_cancel)(struct TCP_Server_Info *, void *,
			   struct mid_q_entry *);
	bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
	/* setup request: allocate mid, sign message */
	int (*setup_request)(struct cifs_ses *, struct kvec *, unsigned int,
			     struct mid_q_entry **);
	/* check response: verify signature, map error */
	int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
			     bool);
	void (*add_credits)(struct TCP_Server_Info *, const unsigned int,
			    const int);
	void (*set_credits)(struct TCP_Server_Info *, const int);
	int * (*get_credits_field)(struct TCP_Server_Info *, const int);
	unsigned int (*get_credits)(struct mid_q_entry *);
	__u64 (*get_next_mid)(struct TCP_Server_Info *);
	/* data offset from read response message */
	unsigned int (*read_data_offset)(char *);
	/* data length from read response message */
	unsigned int (*read_data_length)(char *);
	/* map smb to linux error */
	int (*map_error)(char *, bool);
	/* find mid corresponding to the response message */
	struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
	void (*dump_detail)(void *);
	/* verify the message */
	int (*check_message)(char *, unsigned int);
	bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
	/* process transaction2 response */
	bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
			     char *, int);
	/* check if we need to negotiate */
	bool (*need_neg)(struct TCP_Server_Info *);
	/* negotiate to the server */
	int (*negotiate)(const unsigned int, struct cifs_ses *);
	/* setup smb sessionn */
	int (*sess_setup)(const unsigned int, struct cifs_ses *,
			  const struct nls_table *);
	/* close smb session */
	int (*logoff)(const unsigned int, struct cifs_ses *);
	/* connect to a server share */
	int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
			    struct cifs_tcon *, const struct nls_table *);
	/* close tree connecion */
	int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
	/* get DFS referrals */
	int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
			     const char *, struct dfs_info3_param **,
			     unsigned int *, const struct nls_table *, int);
	/* informational QFS call */
	void (*qfs_tcon)(const unsigned int, struct cifs_tcon *);
	/* check if a path is accessible or not */
	int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
				  struct cifs_sb_info *, const char *);
	/* query path data from the server */
	int (*query_path_info)(const unsigned int, struct cifs_tcon *,
			       struct cifs_sb_info *, const char *,
			       FILE_ALL_INFO *, bool *);
	/* get server index number */
	int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
			    struct cifs_sb_info *, const char *,
			    u64 *uniqueid, FILE_ALL_INFO *);
	/* build a full path to the root of the mount */
	char * (*build_path_to_root)(struct smb_vol *, struct cifs_sb_info *,
				     struct cifs_tcon *);
};

struct smb_version_values {
	char		*version_string;
	__u32		large_lock_type;
	__u32		exclusive_lock_type;
	__u32		shared_lock_type;
	__u32		unlock_lock_type;
	size_t		header_size;
	size_t		max_header_size;
	size_t		read_rsp_size;
	__le16		lock_cmd;
};

#define HEADER_SIZE(server) (server->vals->header_size)
#define MAX_HEADER_SIZE(server) (server->vals->max_header_size)

struct smb_vol {
	char *username;
	char *password;
	char *domainname;
	char *UNC;
	char *UNCip;
	char *iocharset;  /* local code page for mapping to and from Unicode */
	char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
	char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
	uid_t cred_uid;
	uid_t linux_uid;
	gid_t linux_gid;
	uid_t backupuid;
	gid_t backupgid;
	umode_t file_mode;
	umode_t dir_mode;
	unsigned secFlg;
	bool retry:1;
	bool intr:1;
	bool setuids:1;
	bool override_uid:1;
	bool override_gid:1;
	bool dynperm:1;
	bool noperm:1;
	bool no_psx_acl:1; /* set if posix acl support should be disabled */
	bool cifs_acl:1;
	bool backupuid_specified; /* mount option  backupuid  is specified */
	bool backupgid_specified; /* mount option  backupgid  is specified */
	bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
	bool server_ino:1; /* use inode numbers from server ie UniqueId */
	bool direct_io:1;
	bool strict_io:1; /* strict cache behavior */
	bool remap:1;      /* set to remap seven reserved chars in filenames */
	bool posix_paths:1; /* unset to not ask for posix pathnames. */
	bool no_linux_ext:1;
	bool sfu_emul:1;
	bool nullauth:1;   /* attempt to authenticate with null user */
	bool nocase:1;     /* request case insensitive filenames */
	bool nobrl:1;      /* disable sending byte range locks to srv */
	bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
	bool seal:1;       /* request transport encryption on share */
	bool nodfs:1;      /* Do not request DFS, even if available */
	bool local_lease:1; /* check leases only on local system, not remote */
	bool noblocksnd:1;
	bool noautotune:1;
	bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
	bool fsc:1;	/* enable fscache */
	bool mfsymlinks:1; /* use Minshall+French Symlinks */
	bool multiuser:1;
	bool rwpidforward:1; /* pid forward for read/write operations */
	unsigned int rsize;
	unsigned int wsize;
	bool sockopt_tcp_nodelay:1;
	unsigned short int port;
	unsigned long actimeo; /* attribute cache timeout (jiffies) */
	struct smb_version_operations *ops;
	struct smb_version_values *vals;
	char *prepath;
	struct sockaddr_storage srcaddr; /* allow binding to a local IP */
	struct nls_table *local_nls;
};

#define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
			 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
			 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
			 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
			 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
			 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
			 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
			 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
			 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
			 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID)

#define CIFS_MS_MASK (MS_RDONLY | MS_MANDLOCK | MS_NOEXEC | MS_NOSUID | \
		      MS_NODEV | MS_SYNCHRONOUS)

struct cifs_mnt_data {
	struct cifs_sb_info *cifs_sb;
	struct smb_vol *vol;
	int flags;
};

static inline unsigned int
get_rfc1002_length(void *buf)
{
	return be32_to_cpu(*((__be32 *)buf));
}

static inline void
inc_rfc1001_len(void *buf, int count)
{
	be32_add_cpu((__be32 *)buf, count);
}

struct TCP_Server_Info {
	struct list_head tcp_ses_list;
	struct list_head smb_ses_list;
	int srv_count; /* reference counter */
	/* 15 character server name + 0x20 16th byte indicating type = srv */
	char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
	struct smb_version_operations	*ops;
	struct smb_version_values	*vals;
	enum statusEnum tcpStatus; /* what we think the status is */
	char *hostname; /* hostname portion of UNC string */
	struct socket *ssocket;
	struct sockaddr_storage dstaddr;
	struct sockaddr_storage srcaddr; /* locally bind to this IP */
#ifdef CONFIG_NET_NS
	struct net *net;
#endif
	wait_queue_head_t response_q;
	wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
	struct list_head pending_mid_q;
	bool noblocksnd;		/* use blocking sendmsg */
	bool noautotune;		/* do not autotune send buf sizes */
	bool tcp_nodelay;
	int credits;  /* send no more requests at once */
	unsigned int in_flight;  /* number of requests on the wire to server */
	spinlock_t req_lock;  /* protect the two values above */
	struct mutex srv_mutex;
	struct task_struct *tsk;
	char server_GUID[16];
	__u16 sec_mode;
	bool session_estab; /* mark when very first sess is established */
#ifdef CONFIG_CIFS_SMB2
	int echo_credits;  /* echo reserved slots */
	int oplock_credits;  /* oplock break reserved slots */
	bool echoes:1; /* enable echoes */
#endif
	u16 dialect; /* dialect index that server chose */
	enum securityEnum secType;
	bool oplocks:1; /* enable oplocks */
	unsigned int maxReq;	/* Clients should submit no more */
	/* than maxReq distinct unanswered SMBs to the server when using  */
	/* multiplexed reads or writes */
	unsigned int maxBuf;	/* maxBuf specifies the maximum */
	/* message size the server can send or receive for non-raw SMBs */
	/* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
	/* when socket is setup (and during reconnect) before NegProt sent */
	unsigned int max_rw;	/* maxRw specifies the maximum */
	/* message size the server can send or receive for */
	/* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
	unsigned int max_vcs;	/* maximum number of smb sessions, at least
				   those that can be specified uniquely with
				   vcnumbers */
	int capabilities; /* allow selective disabling of caps by smb sess */
	int timeAdj;  /* Adjust for difference in server time zone in sec */
	__u64 CurrentMid;         /* multiplex id - rotating counter */
	char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
	/* 16th byte of RFC1001 workstation name is always null */
	char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
	__u32 sequence_number; /* for signing, protected by srv_mutex */
	struct session_key session_key;
	unsigned long lstrp; /* when we got last response from this server */
	struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
	/* extended security flavors that server supports */
	bool	sec_ntlmssp;		/* supports NTLMSSP */
	bool	sec_kerberosu2u;	/* supports U2U Kerberos */
	bool	sec_kerberos;		/* supports plain Kerberos */
	bool	sec_mskerberos;		/* supports legacy MS Kerberos */
	bool	large_buf;		/* is current buffer large? */
	struct delayed_work	echo; /* echo ping workqueue job */
	struct kvec *iov;	/* reusable kvec array for receives */
	unsigned int nr_iov;	/* number of kvecs in array */
	char	*smallbuf;	/* pointer to current "small" buffer */
	char	*bigbuf;	/* pointer to current "big" buffer */
	unsigned int total_read; /* total amount of data read in this pass */
#ifdef CONFIG_CIFS_FSCACHE
	struct fscache_cookie   *fscache; /* client index cache cookie */
#endif
#ifdef CONFIG_CIFS_STATS2
	atomic_t in_send; /* requests trying to send */
	atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
#endif
#ifdef CONFIG_CIFS_SMB2
	unsigned int	max_read;
	unsigned int	max_write;
#endif /* CONFIG_CIFS_SMB2 */
};

static inline unsigned int
in_flight(struct TCP_Server_Info *server)
{
	unsigned int num;
	spin_lock(&server->req_lock);
	num = server->in_flight;
	spin_unlock(&server->req_lock);
	return num;
}

static inline bool
has_credits(struct TCP_Server_Info *server, int *credits)
{
	int num;
	spin_lock(&server->req_lock);
	num = *credits;
	spin_unlock(&server->req_lock);
	return num > 0;
}

static inline void
add_credits(struct TCP_Server_Info *server, const unsigned int add,
	    const int optype)
{
	server->ops->add_credits(server, add, optype);
}

static inline void
set_credits(struct TCP_Server_Info *server, const int val)
{
	server->ops->set_credits(server, val);
}

static inline __u64
get_next_mid(struct TCP_Server_Info *server)
{
	return server->ops->get_next_mid(server);
}

/*
 * Macros to allow the TCP_Server_Info->net field and related code to drop out
 * when CONFIG_NET_NS isn't set.
 */

#ifdef CONFIG_NET_NS

static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
{
	return srv->net;
}

static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
{
	srv->net = net;
}

#else

static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
{
	return &init_net;
}

static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
{
}

#endif

/*
 * Session structure.  One of these for each uid session with a particular host
 */
struct cifs_ses {
	struct list_head smb_ses_list;
	struct list_head tcon_list;
	struct mutex session_mutex;
	struct TCP_Server_Info *server;	/* pointer to server info */
	int ses_count;		/* reference counter */
	enum statusEnum status;
	unsigned overrideSecFlg;  /* if non-zero override global sec flags */
	__u16 ipc_tid;		/* special tid for connection to IPC share */
	__u16 flags;
	__u16 vcnum;
	char *serverOS;		/* name of operating system underlying server */
	char *serverNOS;	/* name of network operating system of server */
	char *serverDomain;	/* security realm of server */
	__u64 Suid;		/* remote smb uid  */
	uid_t linux_uid;        /* overriding owner of files on the mount */
	uid_t cred_uid;		/* owner of credentials */
	int capabilities;
	char serverName[SERVER_NAME_LEN_WITH_NULL * 2];	/* BB make bigger for
				TCP names - will ipv6 and sctp addresses fit? */
	char *user_name;	/* must not be null except during init of sess
				   and after mount option parsing we fill it */
	char *domainName;
	char *password;
	struct session_key auth_key;
	struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
	bool need_reconnect:1; /* connection reset, uid now invalid */
#ifdef CONFIG_CIFS_SMB2
	__u16 session_flags;
#endif /* CONFIG_CIFS_SMB2 */
};
/* no more than one of the following three session flags may be set */
#define CIFS_SES_NT4 1
#define CIFS_SES_OS2 2
#define CIFS_SES_W9X 4
/* following flag is set for old servers such as OS2 (and Win95?)
   which do not negotiate NTLM or POSIX dialects, but instead
   negotiate one of the older LANMAN dialects */
#define CIFS_SES_LANMAN 8
/*
 * there is one of these for each connection to a resource on a particular
 * session
 */
struct cifs_tcon {
	struct list_head tcon_list;
	int tc_count;
	struct list_head openFileList;
	struct cifs_ses *ses;	/* pointer to session associated with */
	char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
	char *nativeFileSystem;
	char *password;		/* for share-level security */
	__u32 tid;		/* The 4 byte tree id */
	__u16 Flags;		/* optional support bits */
	enum statusEnum tidStatus;
#ifdef CONFIG_CIFS_STATS
	atomic_t num_smbs_sent;
	atomic_t num_writes;
	atomic_t num_reads;
	atomic_t num_flushes;
	atomic_t num_oplock_brks;
	atomic_t num_opens;
	atomic_t num_closes;
	atomic_t num_deletes;
	atomic_t num_mkdirs;
	atomic_t num_posixopens;
	atomic_t num_posixmkdirs;
	atomic_t num_rmdirs;
	atomic_t num_renames;
	atomic_t num_t2renames;
	atomic_t num_ffirst;
	atomic_t num_fnext;
	atomic_t num_fclose;
	atomic_t num_hardlinks;
	atomic_t num_symlinks;
	atomic_t num_locks;
	atomic_t num_acl_get;
	atomic_t num_acl_set;
#ifdef CONFIG_CIFS_STATS2
	unsigned long long time_writes;
	unsigned long long time_reads;
	unsigned long long time_opens;
	unsigned long long time_deletes;
	unsigned long long time_closes;
	unsigned long long time_mkdirs;
	unsigned long long time_rmdirs;
	unsigned long long time_renames;
	unsigned long long time_t2renames;
	unsigned long long time_ffirst;
	unsigned long long time_fnext;
	unsigned long long time_fclose;
#endif /* CONFIG_CIFS_STATS2 */
	__u64    bytes_read;
	__u64    bytes_written;
	spinlock_t stat_lock;
#endif /* CONFIG_CIFS_STATS */
	FILE_SYSTEM_DEVICE_INFO fsDevInfo;
	FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
	FILE_SYSTEM_UNIX_INFO fsUnixInfo;
	bool ipc:1;		/* set if connection to IPC$ eg for RPC/PIPES */
	bool retry:1;
	bool nocase:1;
	bool seal:1;      /* transport encryption for this mounted share */
	bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
				for this mount even if server would support */
	bool local_lease:1; /* check leases (only) on local system not remote */
	bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
	bool need_reconnect:1; /* connection reset, tid now invalid */
#ifdef CONFIG_CIFS_SMB2
	bool print:1;		/* set if connection to printer share */
	bool bad_network_name:1; /* set if ret status STATUS_BAD_NETWORK_NAME */
	__u32 capabilities;
	__u32 share_flags;
	__u32 maximal_access;
	__u32 vol_serial_number;
	__le64 vol_create_time;
#endif /* CONFIG_CIFS_SMB2 */
#ifdef CONFIG_CIFS_FSCACHE
	u64 resource_id;		/* server resource id */
	struct fscache_cookie *fscache;	/* cookie for share */
#endif
	/* BB add field for back pointer to sb struct(s)? */
};

/*
 * This is a refcounted and timestamped container for a tcon pointer. The
 * container holds a tcon reference. It is considered safe to free one of
 * these when the tl_count goes to 0. The tl_time is the time of the last
 * "get" on the container.
 */
struct tcon_link {
	struct rb_node		tl_rbnode;
	uid_t			tl_uid;
	unsigned long		tl_flags;
#define TCON_LINK_MASTER	0
#define TCON_LINK_PENDING	1
#define TCON_LINK_IN_TREE	2
	unsigned long		tl_time;
	atomic_t		tl_count;
	struct cifs_tcon	*tl_tcon;
};

extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);

static inline struct cifs_tcon *
tlink_tcon(struct tcon_link *tlink)
{
	return tlink->tl_tcon;
}

extern void cifs_put_tlink(struct tcon_link *tlink);

static inline struct tcon_link *
cifs_get_tlink(struct tcon_link *tlink)
{
	if (tlink && !IS_ERR(tlink))
		atomic_inc(&tlink->tl_count);
	return tlink;
}

/* This function is always expected to succeed */
extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);

/*
 * This info hangs off the cifsFileInfo structure, pointed to by llist.
 * This is used to track byte stream locks on the file
 */
struct cifsLockInfo {
	struct list_head llist;	/* pointer to next cifsLockInfo */
	struct list_head blist; /* pointer to locks blocked on this */
	wait_queue_head_t block_q;
	__u64 offset;
	__u64 length;
	__u32 pid;
	__u32 type;
};

/*
 * One of these for each open instance of a file
 */
struct cifs_search_info {
	loff_t index_of_last_entry;
	__u16 entries_in_buffer;
	__u16 info_level;
	__u32 resume_key;
	char *ntwrk_buf_start;
	char *srch_entries_start;
	char *last_entry;
	const char *presume_name;
	unsigned int resume_name_len;
	bool endOfSearch:1;
	bool emptyDir:1;
	bool unicode:1;
	bool smallBuf:1; /* so we know which buf_release function to call */
};

struct cifsFileInfo {
	struct list_head tlist;	/* pointer to next fid owned by tcon */
	struct list_head flist;	/* next fid (file instance) for this inode */
	struct list_head llist;	/*
				 * brlocks held by this fid, protected by
				 * lock_mutex from cifsInodeInfo structure
				 */
	unsigned int uid;	/* allows finding which FileInfo structure */
	__u32 pid;		/* process id who opened file */
	__u16 netfid;		/* file id from remote */
	/* BB add lock scope info here if needed */ ;
	/* lock scope id (0 if none) */
	struct dentry *dentry;
	unsigned int f_flags;
	struct tcon_link *tlink;
	bool invalidHandle:1;	/* file closed via session abend */
	bool oplock_break_cancelled:1;
	int count;		/* refcount protected by cifs_file_list_lock */
	struct mutex fh_mutex; /* prevents reopen race after dead ses*/
	struct cifs_search_info srch_inf;
	struct work_struct oplock_break; /* work for oplock breaks */
};

struct cifs_io_parms {
	__u16 netfid;
	__u32 pid;
	__u64 offset;
	unsigned int length;
	struct cifs_tcon *tcon;
};

/*
 * Take a reference on the file private data. Must be called with
 * cifs_file_list_lock held.
 */
static inline
struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file)
{
	++cifs_file->count;
	return cifs_file;
}

void cifsFileInfo_put(struct cifsFileInfo *cifs_file);

/*
 * One of these for each file inode
 */

struct cifsInodeInfo {
	bool can_cache_brlcks;
	struct mutex lock_mutex;	/*
					 * protect the field above and llist
					 * from every cifsFileInfo structure
					 * from openFileList
					 */
	/* BB add in lists for dirty pages i.e. write caching info for oplock */
	struct list_head openFileList;
	__u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
	bool clientCanCacheRead;	/* read oplock */
	bool clientCanCacheAll;		/* read and writebehind oplock */
	bool delete_pending;		/* DELETE_ON_CLOSE is set */
	bool invalid_mapping;		/* pagecache is invalid */
	unsigned long time;		/* jiffies of last update of inode */
	u64  server_eof;		/* current file size on server -- protected by i_lock */
	u64  uniqueid;			/* server inode number */
	u64  createtime;		/* creation time on server */
#ifdef CONFIG_CIFS_FSCACHE
	struct fscache_cookie *fscache;
#endif
	struct inode vfs_inode;
};

static inline struct cifsInodeInfo *
CIFS_I(struct inode *inode)
{
	return container_of(inode, struct cifsInodeInfo, vfs_inode);
}

static inline struct cifs_sb_info *
CIFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
{
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
		return '/';
	else
		return '\\';
}

static inline void
convert_delimiter(char *path, char delim)
{
	int i;
	char old_delim;

	if (path == NULL)
		return;

	if (delim == '/')
		old_delim = '\\';
	else
		old_delim = '/';

	for (i = 0; path[i] != '\0'; i++) {
		if (path[i] == old_delim)
			path[i] = delim;
	}
}

static inline char *
build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
		   struct cifs_tcon *tcon)
{
	if (!vol->ops->build_path_to_root)
		return NULL;
	return vol->ops->build_path_to_root(vol, cifs_sb, tcon);
}

#ifdef CONFIG_CIFS_STATS
#define cifs_stats_inc atomic_inc

static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
					    unsigned int bytes)
{
	if (bytes) {
		spin_lock(&tcon->stat_lock);
		tcon->bytes_written += bytes;
		spin_unlock(&tcon->stat_lock);
	}
}

static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
					 unsigned int bytes)
{
	spin_lock(&tcon->stat_lock);
	tcon->bytes_read += bytes;
	spin_unlock(&tcon->stat_lock);
}
#else

#define  cifs_stats_inc(field) do {} while (0)
#define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
#define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)

#endif


/*
 * This is the prototype for the mid receive function. This function is for
 * receiving the rest of the SMB frame, starting with the WordCount (which is
 * just after the MID in struct smb_hdr). Note:
 *
 * - This will be called by cifsd, with no locks held.
 * - The mid will still be on the pending_mid_q.
 * - mid->resp_buf will point to the current buffer.
 *
 * Returns zero on a successful receive, or an error. The receive state in
 * the TCP_Server_Info will also be updated.
 */
typedef int (mid_receive_t)(struct TCP_Server_Info *server,
			    struct mid_q_entry *mid);

/*
 * This is the prototype for the mid callback function. This is called once the
 * mid has been received off of the socket. When creating one, take special
 * care to avoid deadlocks. Things to bear in mind:
 *
 * - it will be called by cifsd, with no locks held
 * - the mid will be removed from any lists
 */
typedef void (mid_callback_t)(struct mid_q_entry *mid);

/* one of these for every pending CIFS request to the server */
struct mid_q_entry {
	struct list_head qhead;	/* mids waiting on reply from this server */
	struct TCP_Server_Info *server;	/* server corresponding to this mid */
	__u64 mid;		/* multiplex id */
	__u32 pid;		/* process id */
	__u32 sequence_number;  /* for CIFS signing */
	unsigned long when_alloc;  /* when mid was created */
#ifdef CONFIG_CIFS_STATS2
	unsigned long when_sent; /* time when smb send finished */
	unsigned long when_received; /* when demux complete (taken off wire) */
#endif
	mid_receive_t *receive; /* call receive callback */
	mid_callback_t *callback; /* call completion callback */
	void *callback_data;	  /* general purpose pointer for callback */
	void *resp_buf;		/* pointer to received SMB header */
	int mid_state;	/* wish this were enum but can not pass to wait_event */
	__le16 command;		/* smb command code */
	bool large_buf:1;	/* if valid response, is pointer to large buf */
	bool multiRsp:1;	/* multiple trans2 responses for one request  */
	bool multiEnd:1;	/* both received */
};

/*	Make code in transport.c a little cleaner by moving
	update of optional stats into function below */
#ifdef CONFIG_CIFS_STATS2

static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
{
	atomic_inc(&server->in_send);
}

static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
{
	atomic_dec(&server->in_send);
}

static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
{
	atomic_inc(&server->num_waiters);
}

static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
{
	atomic_dec(&server->num_waiters);
}

static inline void cifs_save_when_sent(struct mid_q_entry *mid)
{
	mid->when_sent = jiffies;
}
#else
static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
{
}
static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
{
}

static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
{
}

static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
{
}

static inline void cifs_save_when_sent(struct mid_q_entry *mid)
{
}
#endif

/* for pending dnotify requests */
struct dir_notify_req {
	struct list_head lhead;
	__le16 Pid;
	__le16 PidHigh;
	__u16 Mid;
	__u16 Tid;
	__u16 Uid;
	__u16 netfid;
	__u32 filter; /* CompletionFilter (for multishot) */
	int multishot;
	struct file *pfile;
};

struct dfs_info3_param {
	int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
	int path_consumed;
	int server_type;
	int ref_flag;
	char *path_name;
	char *node_name;
};

/*
 * common struct for holding inode info when searching for or updating an
 * inode with new info
 */

#define CIFS_FATTR_DFS_REFERRAL		0x1
#define CIFS_FATTR_DELETE_PENDING	0x2
#define CIFS_FATTR_NEED_REVAL		0x4
#define CIFS_FATTR_INO_COLLISION	0x8

struct cifs_fattr {
	u32		cf_flags;
	u32		cf_cifsattrs;
	u64		cf_uniqueid;
	u64		cf_eof;
	u64		cf_bytes;
	u64		cf_createtime;
	uid_t		cf_uid;
	gid_t		cf_gid;
	umode_t		cf_mode;
	dev_t		cf_rdev;
	unsigned int	cf_nlink;
	unsigned int	cf_dtype;
	struct timespec	cf_atime;
	struct timespec	cf_mtime;
	struct timespec	cf_ctime;
};

static inline void free_dfs_info_param(struct dfs_info3_param *param)
{
	if (param) {
		kfree(param->path_name);
		kfree(param->node_name);
		kfree(param);
	}
}

static inline void free_dfs_info_array(struct dfs_info3_param *param,
				       int number_of_items)
{
	int i;
	if ((number_of_items == 0) || (param == NULL))
		return;
	for (i = 0; i < number_of_items; i++) {
		kfree(param[i].path_name);
		kfree(param[i].node_name);
	}
	kfree(param);
}

#define   MID_FREE 0
#define   MID_REQUEST_ALLOCATED 1
#define   MID_REQUEST_SUBMITTED 2
#define   MID_RESPONSE_RECEIVED 4
#define   MID_RETRY_NEEDED      8 /* session closed while this request out */
#define   MID_RESPONSE_MALFORMED 0x10
#define   MID_SHUTDOWN		 0x20

/* Types of response buffer returned from SendReceive2 */
#define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
#define   CIFS_SMALL_BUFFER     1
#define   CIFS_LARGE_BUFFER     2
#define   CIFS_IOVEC            4    /* array of response buffers */

/* Type of Request to SendReceive2 */
#define   CIFS_BLOCKING_OP      1    /* operation can block */
#define   CIFS_ASYNC_OP         2    /* do not wait for response */
#define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
#define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
#define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
#define   CIFS_NO_RESP      0x040    /* no response buffer required */

/* Type of request operation */
#define   CIFS_ECHO_OP      0x080    /* echo request */
#define   CIFS_OBREAK_OP   0x0100    /* oplock break request */
#define   CIFS_NEG_OP      0x0200    /* negotiate request */
#define   CIFS_OP_MASK     0x0380    /* mask request type */

/* Security Flags: indicate type of session setup needed */
#define   CIFSSEC_MAY_SIGN	0x00001
#define   CIFSSEC_MAY_NTLM	0x00002
#define   CIFSSEC_MAY_NTLMV2	0x00004
#define   CIFSSEC_MAY_KRB5	0x00008
#ifdef CONFIG_CIFS_WEAK_PW_HASH
#define   CIFSSEC_MAY_LANMAN	0x00010
#define   CIFSSEC_MAY_PLNTXT	0x00020
#else
#define   CIFSSEC_MAY_LANMAN    0
#define   CIFSSEC_MAY_PLNTXT    0
#endif /* weak passwords */
#define   CIFSSEC_MAY_SEAL	0x00040 /* not supported yet */
#define   CIFSSEC_MAY_NTLMSSP	0x00080 /* raw ntlmssp with ntlmv2 */

#define   CIFSSEC_MUST_SIGN	0x01001
/* note that only one of the following can be set so the
result of setting MUST flags more than once will be to
require use of the stronger protocol */
#define   CIFSSEC_MUST_NTLM	0x02002
#define   CIFSSEC_MUST_NTLMV2	0x04004
#define   CIFSSEC_MUST_KRB5	0x08008
#ifdef CONFIG_CIFS_WEAK_PW_HASH
#define   CIFSSEC_MUST_LANMAN	0x10010
#define   CIFSSEC_MUST_PLNTXT	0x20020
#ifdef CONFIG_CIFS_UPCALL
#define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
#else
#define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
#endif /* UPCALL */
#else /* do not allow weak pw hash */
#define   CIFSSEC_MUST_LANMAN	0
#define   CIFSSEC_MUST_PLNTXT	0
#ifdef CONFIG_CIFS_UPCALL
#define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
#else
#define	  CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
#endif /* UPCALL */
#endif /* WEAK_PW_HASH */
#define   CIFSSEC_MUST_SEAL	0x40040 /* not supported yet */
#define   CIFSSEC_MUST_NTLMSSP	0x80080 /* raw ntlmssp with ntlmv2 */

#define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
#define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
#define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
/*
 *****************************************************************
 * All constants go here
 *****************************************************************
 */

#define UID_HASH (16)

/*
 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 * following to be declared.
 */

/****************************************************************************
 *  Locking notes.  All updates to global variables and lists should be
 *                  protected by spinlocks or semaphores.
 *
 *  Spinlocks
 *  ---------
 *  GlobalMid_Lock protects:
 *	list operations on pending_mid_q and oplockQ
 *      updates to XID counters, multiplex id  and SMB sequence numbers
 *  cifs_file_list_lock protects:
 *	list operations on tcp and SMB session lists and tCon lists
 *  f_owner.lock protects certain per file struct operations
 *  mapping->page_lock protects certain per page operations
 *
 *  Semaphores
 *  ----------
 *  sesSem     operations on smb session
 *  tconSem    operations on tree connection
 *  fh_sem      file handle reconnection operations
 *
 ****************************************************************************/

#ifdef DECLARE_GLOBALS_HERE
#define GLOBAL_EXTERN
#else
#define GLOBAL_EXTERN extern
#endif

/*
 * the list of TCP_Server_Info structures, ie each of the sockets
 * connecting our client to a distinct server (ip address), is
 * chained together by cifs_tcp_ses_list. The list of all our SMB
 * sessions (and from that the tree connections) can be found
 * by iterating over cifs_tcp_ses_list
 */
GLOBAL_EXTERN struct list_head		cifs_tcp_ses_list;

/*
 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 * tcp session, and the list of tcon's per smb session. It also protects
 * the reference counters for the server, smb session, and tcon. Finally,
 * changes to the tcon->tidStatus should be done while holding this lock.
 */
GLOBAL_EXTERN spinlock_t		cifs_tcp_ses_lock;

/*
 * This lock protects the cifs_file->llist and cifs_file->flist
 * list operations, and updates to some flags (cifs_file->invalidHandle)
 * It will be moved to either use the tcon->stat_lock or equivalent later.
 * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 * the cifs_tcp_ses_lock must be grabbed first and released last.
 */
GLOBAL_EXTERN spinlock_t	cifs_file_list_lock;

#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
/* Outstanding dir notify requests */
GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
/* DirNotify response queue */
GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */

/*
 * Global transaction id (XID) information
 */
GLOBAL_EXTERN unsigned int GlobalCurrentXid;	/* protected by GlobalMid_Sem */
GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;	/* prot by GlobalMid_Sem */
GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
					  /* on midQ entries */
/*
 *  Global counters, updated atomically
 */
GLOBAL_EXTERN atomic_t sesInfoAllocCount;
GLOBAL_EXTERN atomic_t tconInfoAllocCount;
GLOBAL_EXTERN atomic_t tcpSesAllocCount;
GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
GLOBAL_EXTERN atomic_t tconInfoReconnectCount;

/* Various Debug counters */
GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
#ifdef CONFIG_CIFS_STATS2
GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
GLOBAL_EXTERN atomic_t totSmBufAllocCount;
#endif
GLOBAL_EXTERN atomic_t smBufAllocCount;
GLOBAL_EXTERN atomic_t midCount;

/* Misc globals */
GLOBAL_EXTERN bool enable_oplocks; /* enable or disable oplocks */
GLOBAL_EXTERN unsigned int lookupCacheEnabled;
GLOBAL_EXTERN unsigned int global_secflags;	/* if on, session setup sent
				with more secure ntlmssp2 challenge/resp */
GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/

#ifdef CONFIG_CIFS_ACL
GLOBAL_EXTERN struct rb_root uidtree;
GLOBAL_EXTERN struct rb_root gidtree;
GLOBAL_EXTERN spinlock_t siduidlock;
GLOBAL_EXTERN spinlock_t sidgidlock;
GLOBAL_EXTERN struct rb_root siduidtree;
GLOBAL_EXTERN struct rb_root sidgidtree;
GLOBAL_EXTERN spinlock_t uidsidlock;
GLOBAL_EXTERN spinlock_t gidsidlock;
#endif /* CONFIG_CIFS_ACL */

void cifs_oplock_break(struct work_struct *work);

extern const struct slow_work_ops cifs_oplock_break_ops;
extern struct workqueue_struct *cifsiod_wq;

extern mempool_t *cifs_mid_poolp;

/* Operations for different SMB versions */
#define SMB1_VERSION_STRING	"1.0"
extern struct smb_version_operations smb1_operations;
extern struct smb_version_values smb1_values;
#define SMB21_VERSION_STRING	"2.1"
extern struct smb_version_operations smb21_operations;
extern struct smb_version_values smb21_values;
#endif	/* _CIFS_GLOB_H */
OpenPOWER on IntegriCloud