Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: faba4d69fe91fbcd12279c3683d88a03d479830a (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
/*
 *   fs/cifs/cifsfs.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2007
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   Common Internet FileSystem (CIFS) client
 *
 *   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.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/* Note that BB means BUGBUG (ie something to fix eventually) */

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/seq_file.h>
#include <linux/vfs.h>
#include <linux/mempool.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include "cifsfs.h"
#include "cifspdu.h"
#define DECLARE_GLOBALS_HERE
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include <linux/mm.h>
#define CIFS_MAGIC_NUMBER 0xFF534D42	/* the first four bytes of SMB PDUs */

#ifdef CONFIG_CIFS_QUOTA
static struct quotactl_ops cifs_quotactl_ops;
#endif /* QUOTA */

#ifdef CONFIG_CIFS_EXPERIMENTAL
extern struct export_operations cifs_export_ops;
#endif /* EXPERIMENTAL */

int cifsFYI = 0;
int cifsERROR = 1;
int traceSMB = 0;
unsigned int oplockEnabled = 1;
unsigned int experimEnabled = 0;
unsigned int linuxExtEnabled = 1;
unsigned int lookupCacheEnabled = 1;
unsigned int multiuser_mount = 0;
unsigned int extended_security = CIFSSEC_DEF;
/* unsigned int ntlmv2_support = 0; */
unsigned int sign_CIFS_PDUs = 1;
extern struct task_struct * oplockThread; /* remove sparse warning */
struct task_struct * oplockThread = NULL;
/* extern struct task_struct * dnotifyThread; remove sparse warning */
static struct task_struct * dnotifyThread = NULL;
static const struct super_operations cifs_super_ops;
unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
module_param(CIFSMaxBufSize, int, 0);
MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
module_param(cifs_min_rcv, int, 0);
MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
unsigned int cifs_min_small = 30;
module_param(cifs_min_small, int, 0);
MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
unsigned int cifs_max_pending = CIFS_MAX_REQ;
module_param(cifs_max_pending, int, 0);
MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");

extern mempool_t *cifs_sm_req_poolp;
extern mempool_t *cifs_req_poolp;
extern mempool_t *cifs_mid_poolp;

extern struct kmem_cache *cifs_oplock_cachep;

static int
cifs_read_super(struct super_block *sb, void *data,
		const char *devname, int silent)
{
	struct inode *inode;
	struct cifs_sb_info *cifs_sb;
	int rc = 0;
	
	/* BB should we make this contingent on mount parm? */
	sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
	sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
	cifs_sb = CIFS_SB(sb);
	if(cifs_sb == NULL)
		return -ENOMEM;

	rc = cifs_mount(sb, cifs_sb, data, devname);

	if (rc) {
		if (!silent)
			cERROR(1,
			       ("cifs_mount failed w/return code = %d", rc));
		goto out_mount_failed;
	}

	sb->s_magic = CIFS_MAGIC_NUMBER;
	sb->s_op = &cifs_super_ops;
#ifdef CONFIG_CIFS_EXPERIMENTAL
	if(experimEnabled != 0)
		sb->s_export_op = &cifs_export_ops;
#endif /* EXPERIMENTAL */	
/*	if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
	    sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
#ifdef CONFIG_CIFS_QUOTA
	sb->s_qcop = &cifs_quotactl_ops;
#endif
	sb->s_blocksize = CIFS_MAX_MSGSIZE;
	sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
	inode = iget(sb, ROOT_I);

	if (!inode) {
		rc = -ENOMEM;
		goto out_no_root;
	}

	sb->s_root = d_alloc_root(inode);

	if (!sb->s_root) {
		rc = -ENOMEM;
		goto out_no_root;
	}

	return 0;

out_no_root:
	cERROR(1, ("cifs_read_super: get root inode failed"));
	if (inode)
		iput(inode);

out_mount_failed:
	if(cifs_sb) {
		if(cifs_sb->local_nls)
			unload_nls(cifs_sb->local_nls);	
		kfree(cifs_sb);
	}
	return rc;
}

static void
cifs_put_super(struct super_block *sb)
{
	int rc = 0;
	struct cifs_sb_info *cifs_sb;

	cFYI(1, ("In cifs_put_super"));
	cifs_sb = CIFS_SB(sb);
	if(cifs_sb == NULL) {
		cFYI(1,("Empty cifs superblock info passed to unmount"));
		return;
	}
	rc = cifs_umount(sb, cifs_sb); 
	if (rc) {
		cERROR(1, ("cifs_umount failed with return code %d", rc));
	}
	unload_nls(cifs_sb->local_nls);
	kfree(cifs_sb);
	return;
}

static int
cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	int xid; 
	int rc = -EOPNOTSUPP;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;

	xid = GetXid();

	cifs_sb = CIFS_SB(sb);
	pTcon = cifs_sb->tcon;

	buf->f_type = CIFS_MAGIC_NUMBER;

	/* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
	buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would 
				      presumably be total path, but note
				      that some servers (includinng Samba 3)
				      have a shorter maximum path */
	buf->f_files = 0;	/* undefined */
	buf->f_ffree = 0;	/* unlimited */

/* BB we could add a second check for a QFS Unix capability bit */
/* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
    if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
			le64_to_cpu(pTcon->fsUnixInfo.Capability)))
	    rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);

    /* Only need to call the old QFSInfo if failed
    on newer one */
    if(rc)
	if(pTcon->ses->capabilities & CAP_NT_SMBS)
		rc = CIFSSMBQFSInfo(xid, pTcon, buf); /* not supported by OS2 */

	/* Some old Windows servers also do not support level 103, retry with
	   older level one if old server failed the previous call or we
	   bypassed it because we detected that this was an older LANMAN sess */
	if(rc)
		rc = SMBOldQFSInfo(xid, pTcon, buf);
	/*     
	   int f_type;
	   __fsid_t f_fsid;
	   int f_namelen;  */
	/* BB get from info in tcon struct at mount time call to QFSAttrInfo */
	FreeXid(xid);
	return 0;		/* always return success? what if volume is no
				   longer available? */
}

static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
{
	struct cifs_sb_info *cifs_sb;

	cifs_sb = CIFS_SB(inode->i_sb);

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
		return 0;
	} else /* file mode might have been restricted at mount time 
		on the client (above and beyond ACL on servers) for  
		servers which do not support setting and viewing mode bits,
		so allowing client to check permissions is useful */ 
		return generic_permission(inode, mask, NULL);
}

static struct kmem_cache *cifs_inode_cachep;
static struct kmem_cache *cifs_req_cachep;
static struct kmem_cache *cifs_mid_cachep;
struct kmem_cache *cifs_oplock_cachep;
static struct kmem_cache *cifs_sm_req_cachep;
mempool_t *cifs_sm_req_poolp;
mempool_t *cifs_req_poolp;
mempool_t *cifs_mid_poolp;

static struct inode *
cifs_alloc_inode(struct super_block *sb)
{
	struct cifsInodeInfo *cifs_inode;
	cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
	if (!cifs_inode)
		return NULL;
	cifs_inode->cifsAttrs = 0x20;	/* default */
	atomic_set(&cifs_inode->inUse, 0);
	cifs_inode->time = 0;
	/* Until the file is open and we have gotten oplock
	info back from the server, can not assume caching of
	file data or metadata */
	cifs_inode->clientCanCacheRead = FALSE;
	cifs_inode->clientCanCacheAll = FALSE;
	cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
	
	/* Can not set i_flags here - they get immediately overwritten
	   to zero by the VFS */
/*	cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
	INIT_LIST_HEAD(&cifs_inode->openFileList);
	return &cifs_inode->vfs_inode;
}

static void
cifs_destroy_inode(struct inode *inode)
{
	kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
}

/*
 * cifs_show_options() is for displaying mount options in /proc/mounts.
 * Not all settable options are displayed but most of the important
 * ones are.
 */
static int
cifs_show_options(struct seq_file *s, struct vfsmount *m)
{
	struct cifs_sb_info *cifs_sb;

	cifs_sb = CIFS_SB(m->mnt_sb);

	if (cifs_sb) {
		if (cifs_sb->tcon) {
/* BB add prepath to mount options displayed */
			seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
			if (cifs_sb->tcon->ses) {
				if (cifs_sb->tcon->ses->userName)
					seq_printf(s, ",username=%s",
					   cifs_sb->tcon->ses->userName);
				if(cifs_sb->tcon->ses->domainName)
					seq_printf(s, ",domain=%s",
					   cifs_sb->tcon->ses->domainName);
			}
		}
		seq_printf(s, ",rsize=%d",cifs_sb->rsize);
		seq_printf(s, ",wsize=%d",cifs_sb->wsize);
	}
	return 0;
}

#ifdef CONFIG_CIFS_QUOTA
int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
		struct fs_disk_quota * pdquota)
{
	int xid;
	int rc = 0;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct cifsTconInfo *pTcon;
	
	if(cifs_sb)
		pTcon = cifs_sb->tcon;
	else
		return -EIO;


	xid = GetXid();
	if(pTcon) {
		cFYI(1,("set type: 0x%x id: %d",quota_type,qid));		
	} else {
		return -EIO;
	}

	FreeXid(xid);
	return rc;
}

int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
                struct fs_disk_quota * pdquota)
{
	int xid;
	int rc = 0;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct cifsTconInfo *pTcon;

	if(cifs_sb)
		pTcon = cifs_sb->tcon;
	else
		return -EIO;

	xid = GetXid();
	if(pTcon) {
                cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
	} else {
		rc = -EIO;
	}

	FreeXid(xid);
	return rc;
}

int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
{
	int xid; 
	int rc = 0;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct cifsTconInfo *pTcon;

	if(cifs_sb)
		pTcon = cifs_sb->tcon;
	else
		return -EIO;

	xid = GetXid();
	if(pTcon) {
                cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
	} else {
		rc = -EIO;
	}

	FreeXid(xid);
	return rc;
}

int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
{
	int xid;
	int rc = 0;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct cifsTconInfo *pTcon;

	if(cifs_sb) {
		pTcon = cifs_sb->tcon;
	} else {
		return -EIO;
	}
	xid = GetXid();
	if(pTcon) {
		cFYI(1,("pqstats %p",qstats));		
	} else {
		rc = -EIO;
	}

	FreeXid(xid);
	return rc;
}

static struct quotactl_ops cifs_quotactl_ops = {
	.set_xquota	= cifs_xquota_set,
	.get_xquota	= cifs_xquota_set,
	.set_xstate	= cifs_xstate_set,
	.get_xstate	= cifs_xstate_get,
};
#endif

static void cifs_umount_begin(struct vfsmount * vfsmnt, int flags)
{
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo * tcon;

	if (!(flags & MNT_FORCE))
		return;
	cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
	if(cifs_sb == NULL)
		return;

	tcon = cifs_sb->tcon;
	if(tcon == NULL)
		return;
	down(&tcon->tconSem);
	if (atomic_read(&tcon->useCount) == 1)
		tcon->tidStatus = CifsExiting;
	up(&tcon->tconSem);

	/* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
	/* cancel_notify_requests(tcon); */
	if(tcon->ses && tcon->ses->server)
	{
		cFYI(1,("wake up tasks now - umount begin not complete"));
		wake_up_all(&tcon->ses->server->request_q);
		wake_up_all(&tcon->ses->server->response_q);
		msleep(1); /* yield */
		/* we have to kick the requests once more */
		wake_up_all(&tcon->ses->server->response_q);
		msleep(1);
	}
/* BB FIXME - finish add checks for tidStatus BB */

	return;
}

#ifdef CONFIG_CIFS_STATS2
static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
{
	/* BB FIXME */
	return 0;
}
#endif

static int cifs_remount(struct super_block *sb, int *flags, char *data)
{
	*flags |= MS_NODIRATIME;
	return 0;
}

static const struct super_operations cifs_super_ops = {
	.read_inode = cifs_read_inode,
	.put_super = cifs_put_super,
	.statfs = cifs_statfs,
	.alloc_inode = cifs_alloc_inode,
	.destroy_inode = cifs_destroy_inode,
/*	.drop_inode	    = generic_delete_inode, 
	.delete_inode	= cifs_delete_inode,  *//* Do not need the above two functions     
   unless later we add lazy close of inodes or unless the kernel forgets to call
   us with the same number of releases (closes) as opens */
	.show_options = cifs_show_options,
	.umount_begin   = cifs_umount_begin,
	.remount_fs = cifs_remount,
#ifdef CONFIG_CIFS_STATS2
	.show_stats = cifs_show_stats,
#endif
};

static int
cifs_get_sb(struct file_system_type *fs_type,
	    int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	int rc;
	struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);

	cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));

	if (IS_ERR(sb))
		return PTR_ERR(sb);

	sb->s_flags = flags;

	rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
	if (rc) {
		up_write(&sb->s_umount);
		deactivate_super(sb);
		return rc;
	}
	sb->s_flags |= MS_ACTIVE;
	return simple_set_mnt(mnt, sb);
}

static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
				   unsigned long nr_segs, loff_t pos)
{
	struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
	ssize_t written;

	written = generic_file_aio_write(iocb, iov, nr_segs, pos);
	if (!CIFS_I(inode)->clientCanCacheAll)
		filemap_fdatawrite(inode->i_mapping);
	return written;
}

static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
{
	/* origin == SEEK_END => we must revalidate the cached file length */
	if (origin == SEEK_END) {
		int retval;

		/* some applications poll for the file length in this strange
		   way so we must seek to end on non-oplocked files by
		   setting the revalidate time to zero */
		if(file->f_path.dentry->d_inode)		
			CIFS_I(file->f_path.dentry->d_inode)->time = 0;

		retval = cifs_revalidate(file->f_path.dentry);
		if (retval < 0)
			return (loff_t)retval;
	}
	return remote_llseek(file, offset, origin);
}

static struct file_system_type cifs_fs_type = {
	.owner = THIS_MODULE,
	.name = "cifs",
	.get_sb = cifs_get_sb,
	.kill_sb = kill_anon_super,
	/*  .fs_flags */
};
const struct inode_operations cifs_dir_inode_ops = {
	.create = cifs_create,
	.lookup = cifs_lookup,
	.getattr = cifs_getattr,
	.unlink = cifs_unlink,
	.link = cifs_hardlink,
	.mkdir = cifs_mkdir,
	.rmdir = cifs_rmdir,
	.rename = cifs_rename,
	.permission = cifs_permission,
/*	revalidate:cifs_revalidate,   */
	.setattr = cifs_setattr,
	.symlink = cifs_symlink,
	.mknod   = cifs_mknod,
#ifdef CONFIG_CIFS_XATTR
	.setxattr = cifs_setxattr,
	.getxattr = cifs_getxattr,
	.listxattr = cifs_listxattr,
	.removexattr = cifs_removexattr,
#endif
};

const struct inode_operations cifs_file_inode_ops = {
/*	revalidate:cifs_revalidate, */
	.setattr = cifs_setattr,
	.getattr = cifs_getattr, /* do we need this anymore? */
	.rename = cifs_rename,
	.permission = cifs_permission,
#ifdef CONFIG_CIFS_XATTR
	.setxattr = cifs_setxattr,
	.getxattr = cifs_getxattr,
	.listxattr = cifs_listxattr,
	.removexattr = cifs_removexattr,
#endif 
};

const struct inode_operations cifs_symlink_inode_ops = {
	.readlink = generic_readlink, 
	.follow_link = cifs_follow_link,
	.put_link = cifs_put_link,
	.permission = cifs_permission,
	/* BB add the following two eventually */
	/* revalidate: cifs_revalidate,
	   setattr:    cifs_notify_change, *//* BB do we need notify change */
#ifdef CONFIG_CIFS_XATTR
	.setxattr = cifs_setxattr,
	.getxattr = cifs_getxattr,
	.listxattr = cifs_listxattr,
	.removexattr = cifs_removexattr,
#endif 
};

const struct file_operations cifs_file_ops = {
	.read = do_sync_read,
	.write = do_sync_write,
	.aio_read = generic_file_aio_read,
	.aio_write = cifs_file_aio_write,
	.open = cifs_open,
	.release = cifs_close,
	.lock = cifs_lock,
	.fsync = cifs_fsync,
	.flush = cifs_flush,
	.mmap  = cifs_file_mmap,
	.sendfile = generic_file_sendfile,
	.llseek = cifs_llseek,
#ifdef CONFIG_CIFS_POSIX
	.ioctl	= cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */

#ifdef CONFIG_CIFS_EXPERIMENTAL
	.dir_notify = cifs_dir_notify,
#endif /* CONFIG_CIFS_EXPERIMENTAL */
};

const struct file_operations cifs_file_direct_ops = {
	/* no mmap, no aio, no readv - 
	   BB reevaluate whether they can be done with directio, no cache */
	.read = cifs_user_read,
	.write = cifs_user_write,
	.open = cifs_open,
	.release = cifs_close,
	.lock = cifs_lock,
	.fsync = cifs_fsync,
	.flush = cifs_flush,
	.sendfile = generic_file_sendfile, /* BB removeme BB */
#ifdef CONFIG_CIFS_POSIX
	.ioctl  = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */
	.llseek = cifs_llseek,
#ifdef CONFIG_CIFS_EXPERIMENTAL
	.dir_notify = cifs_dir_notify,
#endif /* CONFIG_CIFS_EXPERIMENTAL */
};
const struct file_operations cifs_file_nobrl_ops = {
	.read = do_sync_read,
	.write = do_sync_write,
	.aio_read = generic_file_aio_read,
	.aio_write = cifs_file_aio_write,
	.open = cifs_open,
	.release = cifs_close,
	.fsync = cifs_fsync,
	.flush = cifs_flush,
	.mmap  = cifs_file_mmap,
	.sendfile = generic_file_sendfile,
	.llseek = cifs_llseek,
#ifdef CONFIG_CIFS_POSIX
	.ioctl	= cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */

#ifdef CONFIG_CIFS_EXPERIMENTAL
	.dir_notify = cifs_dir_notify,
#endif /* CONFIG_CIFS_EXPERIMENTAL */
};

const struct file_operations cifs_file_direct_nobrl_ops = {
	/* no mmap, no aio, no readv - 
	   BB reevaluate whether they can be done with directio, no cache */
	.read = cifs_user_read,
	.write = cifs_user_write,
	.open = cifs_open,
	.release = cifs_close,
	.fsync = cifs_fsync,
	.flush = cifs_flush,
	.sendfile = generic_file_sendfile, /* BB removeme BB */
#ifdef CONFIG_CIFS_POSIX
	.ioctl  = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */
	.llseek = cifs_llseek,
#ifdef CONFIG_CIFS_EXPERIMENTAL
	.dir_notify = cifs_dir_notify,
#endif /* CONFIG_CIFS_EXPERIMENTAL */
};

const struct file_operations cifs_dir_ops = {
	.readdir = cifs_readdir,
	.release = cifs_closedir,
	.read    = generic_read_dir,
#ifdef CONFIG_CIFS_EXPERIMENTAL
	.dir_notify = cifs_dir_notify,
#endif /* CONFIG_CIFS_EXPERIMENTAL */
        .ioctl  = cifs_ioctl,
};

static void
cifs_init_once(void *inode, struct kmem_cache * cachep, unsigned long flags)
{
	struct cifsInodeInfo *cifsi = inode;

	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR) {
		inode_init_once(&cifsi->vfs_inode);
		INIT_LIST_HEAD(&cifsi->lockList);
	}
}

static int
cifs_init_inodecache(void)
{
	cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
					      sizeof (struct cifsInodeInfo),
					      0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
					      cifs_init_once, NULL);
	if (cifs_inode_cachep == NULL)
		return -ENOMEM;

	return 0;
}

static void
cifs_destroy_inodecache(void)
{
	kmem_cache_destroy(cifs_inode_cachep);
}

static int
cifs_init_request_bufs(void)
{
	if(CIFSMaxBufSize < 8192) {
	/* Buffer size can not be smaller than 2 * PATH_MAX since maximum
	Unicode path name has to fit in any SMB/CIFS path based frames */
		CIFSMaxBufSize = 8192;
	} else if (CIFSMaxBufSize > 1024*127) {
		CIFSMaxBufSize = 1024 * 127;
	} else {
		CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
	}
/*	cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
	cifs_req_cachep = kmem_cache_create("cifs_request",
					    CIFSMaxBufSize +
					    MAX_CIFS_HDR_SIZE, 0,
					    SLAB_HWCACHE_ALIGN, NULL, NULL);
	if (cifs_req_cachep == NULL)
		return -ENOMEM;

	if(cifs_min_rcv < 1)
		cifs_min_rcv = 1;
	else if (cifs_min_rcv > 64) {
		cifs_min_rcv = 64;
		cERROR(1,("cifs_min_rcv set to maximum (64)"));
	}

	cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
						  cifs_req_cachep);

	if(cifs_req_poolp == NULL) {
		kmem_cache_destroy(cifs_req_cachep);
		return -ENOMEM;
	}
	/* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
	almost all handle based requests (but not write response, nor is it
	sufficient for path based requests).  A smaller size would have
	been more efficient (compacting multiple slab items on one 4k page) 
	for the case in which debug was on, but this larger size allows
	more SMBs to use small buffer alloc and is still much more
	efficient to alloc 1 per page off the slab compared to 17K (5page) 
	alloc of large cifs buffers even when page debugging is on */
	cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
			MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN, 
			NULL, NULL);
	if (cifs_sm_req_cachep == NULL) {
		mempool_destroy(cifs_req_poolp);
		kmem_cache_destroy(cifs_req_cachep);
		return -ENOMEM;              
	}

	if(cifs_min_small < 2)
		cifs_min_small = 2;
	else if (cifs_min_small > 256) {
		cifs_min_small = 256;
		cFYI(1,("cifs_min_small set to maximum (256)"));
	}

	cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
						     cifs_sm_req_cachep);

	if(cifs_sm_req_poolp == NULL) {
		mempool_destroy(cifs_req_poolp);
		kmem_cache_destroy(cifs_req_cachep);
		kmem_cache_destroy(cifs_sm_req_cachep);
		return -ENOMEM;
	}

	return 0;
}

static void
cifs_destroy_request_bufs(void)
{
	mempool_destroy(cifs_req_poolp);
	kmem_cache_destroy(cifs_req_cachep);
	mempool_destroy(cifs_sm_req_poolp);
	kmem_cache_destroy(cifs_sm_req_cachep);
}

static int
cifs_init_mids(void)
{
	cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
				sizeof (struct mid_q_entry), 0,
				SLAB_HWCACHE_ALIGN, NULL, NULL);
	if (cifs_mid_cachep == NULL)
		return -ENOMEM;

	/* 3 is a reasonable minimum number of simultaneous operations */
	cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
	if(cifs_mid_poolp == NULL) {
		kmem_cache_destroy(cifs_mid_cachep);
		return -ENOMEM;
	}

	cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
				sizeof (struct oplock_q_entry), 0,
				SLAB_HWCACHE_ALIGN, NULL, NULL);
	if (cifs_oplock_cachep == NULL) {
		kmem_cache_destroy(cifs_mid_cachep);
		mempool_destroy(cifs_mid_poolp);
		return -ENOMEM;
	}

	return 0;
}

static void
cifs_destroy_mids(void)
{
	mempool_destroy(cifs_mid_poolp);
	kmem_cache_destroy(cifs_mid_cachep);
	kmem_cache_destroy(cifs_oplock_cachep);
}

static int cifs_oplock_thread(void * dummyarg)
{
	struct oplock_q_entry * oplock_item;
	struct cifsTconInfo *pTcon;
	struct inode * inode;
	__u16  netfid;
	int rc;

	do {
		if (try_to_freeze()) 
			continue;
		
		spin_lock(&GlobalMid_Lock);
		if(list_empty(&GlobalOplock_Q)) {
			spin_unlock(&GlobalMid_Lock);
			set_current_state(TASK_INTERRUPTIBLE);
			schedule_timeout(39*HZ);
		} else {
			oplock_item = list_entry(GlobalOplock_Q.next, 
				struct oplock_q_entry, qhead);
			if(oplock_item) {
				cFYI(1,("found oplock item to write out")); 
				pTcon = oplock_item->tcon;
				inode = oplock_item->pinode;
				netfid = oplock_item->netfid;
				spin_unlock(&GlobalMid_Lock);
				DeleteOplockQEntry(oplock_item);
				/* can not grab inode sem here since it would
				deadlock when oplock received on delete 
				since vfs_unlink holds the i_mutex across
				the call */
				/* mutex_lock(&inode->i_mutex);*/
				if (S_ISREG(inode->i_mode)) {
					rc = filemap_fdatawrite(inode->i_mapping);
					if(CIFS_I(inode)->clientCanCacheRead == 0) {
						filemap_fdatawait(inode->i_mapping);
						invalidate_remote_inode(inode);
					}
				} else
					rc = 0;
				/* mutex_unlock(&inode->i_mutex);*/
				if (rc)
					CIFS_I(inode)->write_behind_rc = rc;
				cFYI(1,("Oplock flush inode %p rc %d",inode,rc));

				/* releasing a stale oplock after recent reconnection 
				of smb session using a now incorrect file 
				handle is not a data integrity issue but do  
				not bother sending an oplock release if session 
				to server still is disconnected since oplock 
				already released by the server in that case */
				if(pTcon->tidStatus != CifsNeedReconnect) {
				    rc = CIFSSMBLock(0, pTcon, netfid,
					    0 /* len */ , 0 /* offset */, 0, 
					    0, LOCKING_ANDX_OPLOCK_RELEASE,
					    0 /* wait flag */);
					cFYI(1,("Oplock release rc = %d ",rc));
				}
			} else
				spin_unlock(&GlobalMid_Lock);
			set_current_state(TASK_INTERRUPTIBLE);
			schedule_timeout(1);  /* yield in case q were corrupt */
		}
	} while (!kthread_should_stop());

	return 0;
}

static int cifs_dnotify_thread(void * dummyarg)
{
	struct list_head *tmp;
	struct cifsSesInfo *ses;

	do {
		if (try_to_freeze())
			continue;
		set_current_state(TASK_INTERRUPTIBLE);
		schedule_timeout(15*HZ);
		read_lock(&GlobalSMBSeslock);
		/* check if any stuck requests that need
		   to be woken up and wakeq so the
		   thread can wake up and error out */
		list_for_each(tmp, &GlobalSMBSessionList) {
			ses = list_entry(tmp, struct cifsSesInfo, 
				cifsSessionList);
			if(ses && ses->server && 
			     atomic_read(&ses->server->inFlight))
				wake_up_all(&ses->server->response_q);
		}
		read_unlock(&GlobalSMBSeslock);
	} while (!kthread_should_stop());

	return 0;
}

static int __init
init_cifs(void)
{
	int rc = 0;
#ifdef CONFIG_PROC_FS
	cifs_proc_init();
#endif
/*	INIT_LIST_HEAD(&GlobalServerList);*/	/* BB not implemented yet */
	INIT_LIST_HEAD(&GlobalSMBSessionList);
	INIT_LIST_HEAD(&GlobalTreeConnectionList);
	INIT_LIST_HEAD(&GlobalOplock_Q);
#ifdef CONFIG_CIFS_EXPERIMENTAL
	INIT_LIST_HEAD(&GlobalDnotifyReqList);
	INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
#endif	
/*
 *  Initialize Global counters
 */
	atomic_set(&sesInfoAllocCount, 0);
	atomic_set(&tconInfoAllocCount, 0);
	atomic_set(&tcpSesAllocCount,0);
	atomic_set(&tcpSesReconnectCount, 0);
	atomic_set(&tconInfoReconnectCount, 0);

	atomic_set(&bufAllocCount, 0);
	atomic_set(&smBufAllocCount, 0);
#ifdef CONFIG_CIFS_STATS2
	atomic_set(&totBufAllocCount, 0);
	atomic_set(&totSmBufAllocCount, 0);
#endif /* CONFIG_CIFS_STATS2 */

	atomic_set(&midCount, 0);
	GlobalCurrentXid = 0;
	GlobalTotalActiveXid = 0;
	GlobalMaxActiveXid = 0;
	memset(Local_System_Name, 0, 15);
	rwlock_init(&GlobalSMBSeslock);
	spin_lock_init(&GlobalMid_Lock);

	if(cifs_max_pending < 2) {
		cifs_max_pending = 2;
		cFYI(1,("cifs_max_pending set to min of 2"));
	} else if(cifs_max_pending > 256) {
		cifs_max_pending = 256;
		cFYI(1,("cifs_max_pending set to max of 256"));
	}

	rc = cifs_init_inodecache();
	if (rc)
		goto out_clean_proc;

	rc = cifs_init_mids();
	if (rc)
		goto out_destroy_inodecache;

	rc = cifs_init_request_bufs();
	if (rc)
		goto out_destroy_mids;

	rc = register_filesystem(&cifs_fs_type);
	if (rc)
		goto out_destroy_request_bufs;

	oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
	if (IS_ERR(oplockThread)) {
		rc = PTR_ERR(oplockThread);
		cERROR(1,("error %d create oplock thread", rc));
		goto out_unregister_filesystem;
	}

	dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
	if (IS_ERR(dnotifyThread)) {
		rc = PTR_ERR(dnotifyThread);
		cERROR(1,("error %d create dnotify thread", rc));
		goto out_stop_oplock_thread;
	}

	return 0;

 out_stop_oplock_thread:
	kthread_stop(oplockThread);
 out_unregister_filesystem:
	unregister_filesystem(&cifs_fs_type);
 out_destroy_request_bufs:
	cifs_destroy_request_bufs();
 out_destroy_mids:
	cifs_destroy_mids();
 out_destroy_inodecache:
	cifs_destroy_inodecache();
 out_clean_proc:
#ifdef CONFIG_PROC_FS
	cifs_proc_clean();
#endif
	return rc;
}

static void __exit
exit_cifs(void)
{
	cFYI(0, ("In unregister ie exit_cifs"));
#ifdef CONFIG_PROC_FS
	cifs_proc_clean();
#endif
	unregister_filesystem(&cifs_fs_type);
	cifs_destroy_inodecache();
	cifs_destroy_mids();
	cifs_destroy_request_bufs();
	kthread_stop(oplockThread);
	kthread_stop(dnotifyThread);
}

MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
MODULE_LICENSE("GPL");		/* combination of LGPL + GPL source behaves as GPL */
MODULE_DESCRIPTION
    ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
MODULE_VERSION(CIFS_VERSION);
module_init(init_cifs)
module_exit(exit_cifs)