aboutsummaryrefslogtreecommitdiff
path: root/fs/nfs/nfs3proc.c
blob: a9ddc196224d95de237b1119548a0262c9f02755 (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
/*
 *  linux/fs/nfs/nfs3proc.c
 *
 *  Client-side NFSv3 procedures stubs.
 *
 *  Copyright (C) 1997, Olaf Kirch
 */

#include <linux/mm.h>
#include <linux/utsname.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/lockd/bind.h>
#include <linux/smp_lock.h>
#include <linux/nfs_mount.h>

#define NFSDBG_FACILITY		NFSDBG_PROC

extern struct rpc_procinfo nfs3_procedures[];

/* A wrapper to handle the EJUKEBOX error message */
static int
nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
{
	sigset_t oldset;
	int res;
	rpc_clnt_sigmask(clnt, &oldset);
	do {
		res = rpc_call_sync(clnt, msg, flags);
		if (res != -EJUKEBOX)
			break;
		set_current_state(TASK_INTERRUPTIBLE);
		schedule_timeout(NFS_JUKEBOX_RETRY_TIME);
		res = -ERESTARTSYS;
	} while (!signalled());
	rpc_clnt_sigunmask(clnt, &oldset);
	return res;
}

static inline int
nfs3_rpc_call_wrapper(struct rpc_clnt *clnt, u32 proc, void *argp, void *resp, int flags)
{
	struct rpc_message msg = {
		.rpc_proc	= &clnt->cl_procinfo[proc],
		.rpc_argp	= argp,
		.rpc_resp	= resp,
	};
	return nfs3_rpc_wrapper(clnt, &msg, flags);
}

#define rpc_call(clnt, proc, argp, resp, flags) \
		nfs3_rpc_call_wrapper(clnt, proc, argp, resp, flags)
#define rpc_call_sync(clnt, msg, flags) \
		nfs3_rpc_wrapper(clnt, msg, flags)

static int
nfs3_async_handle_jukebox(struct rpc_task *task)
{
	if (task->tk_status != -EJUKEBOX)
		return 0;
	task->tk_status = 0;
	rpc_restart_call(task);
	rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
	return 1;
}

/*
 * Bare-bones access to getattr: this is for nfs_read_super.
 */
static int
nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
		   struct nfs_fsinfo *info)
{
	int	status;

	dprintk("%s: call  fsinfo\n", __FUNCTION__);
	info->fattr->valid = 0;
	status = rpc_call(server->client_sys, NFS3PROC_FSINFO, fhandle, info, 0);
	dprintk("%s: reply fsinfo: %d\n", __FUNCTION__, status);
	if (!(info->fattr->valid & NFS_ATTR_FATTR)) {
		status = rpc_call(server->client_sys, NFS3PROC_GETATTR, fhandle, info->fattr, 0);
		dprintk("%s: reply getattr: %d\n", __FUNCTION__, status);
	}
	return status;
}

/*
 * One function for each procedure in the NFS protocol.
 */
static int
nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_fattr *fattr)
{
	int	status;

	dprintk("NFS call  getattr\n");
	fattr->valid = 0;
	status = rpc_call(server->client, NFS3PROC_GETATTR,
			  fhandle, fattr, 0);
	dprintk("NFS reply getattr: %d\n", status);
	return status;
}

static int
nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
			struct iattr *sattr)
{
	struct inode *inode = dentry->d_inode;
	struct nfs3_sattrargs	arg = {
		.fh		= NFS_FH(inode),
		.sattr		= sattr,
	};
	int	status;

	dprintk("NFS call  setattr\n");
	fattr->valid = 0;
	status = rpc_call(NFS_CLIENT(inode), NFS3PROC_SETATTR, &arg, fattr, 0);
	dprintk("NFS reply setattr: %d\n", status);
	return status;
}

static int
nfs3_proc_lookup(struct inode *dir, struct qstr *name,
		 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
	struct nfs_fattr	dir_attr;
	struct nfs3_diropargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= name->name,
		.len		= name->len
	};
	struct nfs3_diropres	res = {
		.dir_attr	= &dir_attr,
		.fh		= fhandle,
		.fattr		= fattr
	};
	int			status;

	dprintk("NFS call  lookup %s\n", name->name);
	dir_attr.valid = 0;
	fattr->valid = 0;
	status = rpc_call(NFS_CLIENT(dir), NFS3PROC_LOOKUP, &arg, &res, 0);
	if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR))
		status = rpc_call(NFS_CLIENT(dir), NFS3PROC_GETATTR,
			 fhandle, fattr, 0);
	dprintk("NFS reply lookup: %d\n", status);
	if (status >= 0)
		status = nfs_refresh_inode(dir, &dir_attr);
	return status;
}

static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
	struct nfs_fattr	fattr;
	struct nfs3_accessargs	arg = {
		.fh		= NFS_FH(inode),
	};
	struct nfs3_accessres	res = {
		.fattr		= &fattr,
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs3_procedures[NFS3PROC_ACCESS],
		.rpc_argp	= &arg,
		.rpc_resp	= &res,
		.rpc_cred	= entry->cred
	};
	int mode = entry->mask;
	int status;

	dprintk("NFS call  access\n");
	fattr.valid = 0;

	if (mode & MAY_READ)
		arg.access |= NFS3_ACCESS_READ;
	if (S_ISDIR(inode->i_mode)) {
		if (mode & MAY_WRITE)
			arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE;
		if (mode & MAY_EXEC)
			arg.access |= NFS3_ACCESS_LOOKUP;
	} else {
		if (mode & MAY_WRITE)
			arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND;
		if (mode & MAY_EXEC)
			arg.access |= NFS3_ACCESS_EXECUTE;
	}
	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
	nfs_refresh_inode(inode, &fattr);
	if (status == 0) {
		entry->mask = 0;
		if (res.access & NFS3_ACCESS_READ)
			entry->mask |= MAY_READ;
		if (res.access & (NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE))
			entry->mask |= MAY_WRITE;
		if (res.access & (NFS3_ACCESS_LOOKUP|NFS3_ACCESS_EXECUTE))
			entry->mask |= MAY_EXEC;
	}
	dprintk("NFS reply access: %d\n", status);
	return status;
}

static int nfs3_proc_readlink(struct inode *inode, struct page *page,
		unsigned int pgbase, unsigned int pglen)
{
	struct nfs_fattr	fattr;
	struct nfs3_readlinkargs args = {
		.fh		= NFS_FH(inode),
		.pgbase		= pgbase,
		.pglen		= pglen,
		.pages		= &page
	};
	int			status;

	dprintk("NFS call  readlink\n");
	fattr.valid = 0;
	status = rpc_call(NFS_CLIENT(inode), NFS3PROC_READLINK,
			  &args, &fattr, 0);
	nfs_refresh_inode(inode, &fattr);
	dprintk("NFS reply readlink: %d\n", status);
	return status;
}

static int nfs3_proc_read(struct nfs_read_data *rdata)
{
	int			flags = rdata->flags;
	struct inode *		inode = rdata->inode;
	struct nfs_fattr *	fattr = rdata->res.fattr;
	struct rpc_message	msg = {
		.rpc_proc	= &nfs3_procedures[NFS3PROC_READ],
		.rpc_argp	= &rdata->args,
		.rpc_resp	= &rdata->res,
		.rpc_cred	= rdata->cred,
	};
	int			status;

	dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
			(long long) rdata->args.offset);
	fattr->valid = 0;
	status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
	if (status >= 0)
		nfs_refresh_inode(inode, fattr);
	dprintk("NFS reply read: %d\n", status);
	return status;
}

static int nfs3_proc_write(struct nfs_write_data *wdata)
{
	int			rpcflags = wdata->flags;
	struct inode *		inode = wdata->inode;
	struct nfs_fattr *	fattr = wdata->res.fattr;
	struct rpc_message	msg = {
		.rpc_proc	= &nfs3_procedures[NFS3PROC_WRITE],
		.rpc_argp	= &wdata->args,
		.rpc_resp	= &wdata->res,
		.rpc_cred	= wdata->cred,
	};
	int			status;

	dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
			(long long) wdata->args.offset);
	fattr->valid = 0;
	status = rpc_call_sync(NFS_CLIENT(inode), &msg, rpcflags);
	if (status >= 0)
		nfs_refresh_inode(inode, fattr);
	dprintk("NFS reply write: %d\n", status);
	return status < 0? status : wdata->res.count;
}

static int nfs3_proc_commit(struct nfs_write_data *cdata)
{
	struct inode *		inode = cdata->inode;
	struct nfs_fattr *	fattr = cdata->res.fattr;
	struct rpc_message	msg = {
		.rpc_proc	= &nfs3_procedures[NFS3PROC_COMMIT],
		.rpc_argp	= &cdata->args,
		.rpc_resp	= &cdata->res,
		.rpc_cred	= cdata->cred,
	};
	int			status;

	dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
			(long long) cdata->args.offset);
	fattr->valid = 0;
	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
	if (status >= 0)
		nfs_refresh_inode(inode, fattr);
	dprintk("NFS reply commit: %d\n", status);
	return status;
}

/*
 * Create a regular file.
 * For now, we don't implement O_EXCL.
 */
static int
nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
		 int flags)
{
	struct nfs_fh		fhandle;
	struct nfs_fattr	fattr;
	struct nfs_fattr	dir_attr;
	struct nfs3_createargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= dentry->d_name.name,
		.len		= dentry->d_name.len,
		.sattr		= sattr,
	};
	struct nfs3_diropres	res = {
		.dir_attr	= &dir_attr,
		.fh		= &fhandle,
		.fattr		= &fattr
	};
	mode_t mode = sattr->ia_mode;
	int status;

	dprintk("NFS call  create %s\n", dentry->d_name.name);
	arg.createmode = NFS3_CREATE_UNCHECKED;
	if (flags & O_EXCL) {
		arg.createmode  = NFS3_CREATE_EXCLUSIVE;
		arg.verifier[0] = jiffies;
		arg.verifier[1] = current->pid;
	}

	sattr->ia_mode &= ~current->fs->umask;

again:
	dir_attr.valid = 0;
	fattr.valid = 0;
	status = rpc_call(NFS_CLIENT(dir), NFS3PROC_CREATE, &arg, &res, 0);
	nfs_refresh_inode(dir, &dir_attr);

	/* If the server doesn't support the exclusive creation semantics,
	 * try again with simple 'guarded' mode. */
	if (status == NFSERR_NOTSUPP) {
		switch (arg.createmode) {
			case NFS3_CREATE_EXCLUSIVE:
				arg.createmode = NFS3_CREATE_GUARDED;
				break;

			case NFS3_CREATE_GUARDED:
				arg.createmode = NFS3_CREATE_UNCHECKED;
				break;

			case NFS3_CREATE_UNCHECKED:
				goto out;
		}
		goto again;
	}

	if (status == 0)
		status = nfs_instantiate(dentry, &fhandle, &fattr);
	if (status != 0)
		goto out;

	/* When we created the file with exclusive semantics, make
	 * sure we set the attributes afterwards. */
	if (arg.createmode == NFS3_CREATE_EXCLUSIVE) {
		dprintk("NFS call  setattr (post-create)\n");

		if (!(sattr->ia_valid & ATTR_ATIME_SET))
			sattr->ia_valid |= ATTR_ATIME;
		if (!(sattr->ia_valid & ATTR_MTIME_SET))
			sattr->ia_valid |= ATTR_MTIME;

		/* Note: we could use a guarded setattr here, but I'm
		 * not sure this buys us anything (and I'd have
		 * to revamp the NFSv3 XDR code) */
		status = nfs3_proc_setattr(dentry, &fattr, sattr);
		nfs_refresh_inode(dentry->d_inode, &fattr);
		dprintk("NFS reply setattr (post-create): %d\n", status);
	}
	if (status != 0)
		goto out;
	status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
out:
	dprintk("NFS reply create: %d\n", status);
	return status;
}

static int
nfs3_proc_remove(struct inode *dir, struct qstr *name)
{
	struct nfs_fattr	dir_attr;
	struct nfs3_diropargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= name->name,
		.len		= name->len
	};
	struct rpc_message	msg = {
		.rpc_proc	= &nfs3_procedures[NFS3PROC_REMOVE],
		.rpc_argp	= &arg,
		.rpc_resp	= &dir_attr,
	};
	int			status;

	dprintk("NFS call  remove %s\n", name->name);
	dir_attr.valid = 0;
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	nfs_refresh_inode(dir, &dir_attr);
	dprintk("NFS reply remove: %d\n", status);
	return status;
}

static int
nfs3_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
{
	struct unlinkxdr {
		struct nfs3_diropargs arg;
		struct nfs_fattr res;
	} *ptr;

	ptr = (struct unlinkxdr *)kmalloc(sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return -ENOMEM;
	ptr->arg.fh = NFS_FH(dir->d_inode);
	ptr->arg.name = name->name;
	ptr->arg.len = name->len;
	ptr->res.valid = 0;
	msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
	msg->rpc_argp = &ptr->arg;
	msg->rpc_resp = &ptr->res;
	return 0;
}

static int
nfs3_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
{
	struct rpc_message *msg = &task->tk_msg;
	struct nfs_fattr	*dir_attr;

	if (nfs3_async_handle_jukebox(task))
		return 1;
	if (msg->rpc_argp) {
		dir_attr = (struct nfs_fattr*)msg->rpc_resp;
		nfs_refresh_inode(dir->d_inode, dir_attr);
		kfree(msg->rpc_argp);
	}
	return 0;
}

static int
nfs3_proc_rename(struct inode *old_dir, struct qstr *old_name,
		 struct inode *new_dir, struct qstr *new_name)
{
	struct nfs_fattr	old_dir_attr, new_dir_attr;
	struct nfs3_renameargs	arg = {
		.fromfh		= NFS_FH(old_dir),
		.fromname	= old_name->name,
		.fromlen	= old_name->len,
		.tofh		= NFS_FH(new_dir),
		.toname		= new_name->name,
		.tolen		= new_name->len
	};
	struct nfs3_renameres	res = {
		.fromattr	= &old_dir_attr,
		.toattr		= &new_dir_attr
	};
	int			status;

	dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
	old_dir_attr.valid = 0;
	new_dir_attr.valid = 0;
	status = rpc_call(NFS_CLIENT(old_dir), NFS3PROC_RENAME, &arg, &res, 0);
	nfs_refresh_inode(old_dir, &old_dir_attr);
	nfs_refresh_inode(new_dir, &new_dir_attr);
	dprintk("NFS reply rename: %d\n", status);
	return status;
}

static int
nfs3_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
	struct nfs_fattr	dir_attr, fattr;
	struct nfs3_linkargs	arg = {
		.fromfh		= NFS_FH(inode),
		.tofh		= NFS_FH(dir),
		.toname		= name->name,
		.tolen		= name->len
	};
	struct nfs3_linkres	res = {
		.dir_attr	= &dir_attr,
		.fattr		= &fattr
	};
	int			status;

	dprintk("NFS call  link %s\n", name->name);
	dir_attr.valid = 0;
	fattr.valid = 0;
	status = rpc_call(NFS_CLIENT(inode), NFS3PROC_LINK, &arg, &res, 0);
	nfs_refresh_inode(dir, &dir_attr);
	nfs_refresh_inode(inode, &fattr);
	dprintk("NFS reply link: %d\n", status);
	return status;
}

static int
nfs3_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path,
		  struct iattr *sattr, struct nfs_fh *fhandle,
		  struct nfs_fattr *fattr)
{
	struct nfs_fattr	dir_attr;
	struct nfs3_symlinkargs	arg = {
		.fromfh		= NFS_FH(dir),
		.fromname	= name->name,
		.fromlen	= name->len,
		.topath		= path->name,
		.tolen		= path->len,
		.sattr		= sattr
	};
	struct nfs3_diropres	res = {
		.dir_attr	= &dir_attr,
		.fh		= fhandle,
		.fattr		= fattr
	};
	int			status;

	if (path->len > NFS3_MAXPATHLEN)
		return -ENAMETOOLONG;
	dprintk("NFS call  symlink %s -> %s\n", name->name, path->name);
	dir_attr.valid = 0;
	fattr->valid = 0;
	status = rpc_call(NFS_CLIENT(dir), NFS3PROC_SYMLINK, &arg, &res, 0);
	nfs_refresh_inode(dir, &dir_attr);
	dprintk("NFS reply symlink: %d\n", status);
	return status;
}

static int
nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
{
	struct nfs_fh fhandle;
	struct nfs_fattr fattr, dir_attr;
	struct nfs3_mkdirargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= dentry->d_name.name,
		.len		= dentry->d_name.len,
		.sattr		= sattr
	};
	struct nfs3_diropres	res = {
		.dir_attr	= &dir_attr,
		.fh		= &fhandle,
		.fattr		= &fattr
	};
	int mode = sattr->ia_mode;
	int status;

	dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
	dir_attr.valid = 0;
	fattr.valid = 0;

	sattr->ia_mode &= ~current->fs->umask;

	status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKDIR, &arg, &res, 0);
	nfs_refresh_inode(dir, &dir_attr);
	if (status != 0)
		goto out;
	status = nfs_instantiate(dentry, &fhandle, &fattr);
	if (status != 0)
		goto out;
	status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
out:
	dprintk("NFS reply mkdir: %d\n", status);
	return status;
}

static int
nfs3_proc_rmdir(struct inode *dir, struct qstr *name)
{
	struct nfs_fattr	dir_attr;
	struct nfs3_diropargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= name->name,
		.len		= name->len
	};
	int			status;

	dprintk("NFS call  rmdir %s\n", name->name);
	dir_attr.valid = 0;
	status = rpc_call(NFS_CLIENT(dir), NFS3PROC_RMDIR, &arg, &dir_attr, 0);
	nfs_refresh_inode(dir, &dir_attr);
	dprintk("NFS reply rmdir: %d\n", status);
	return status;
}

/*
 * The READDIR implementation is somewhat hackish - we pass the user buffer
 * to the encode function, which installs it in the receive iovec.
 * The decode function itself doesn't perform any decoding, it just makes
 * sure the reply is syntactically correct.
 *
 * Also note that this implementation handles both plain readdir and
 * readdirplus.
 */
static int
nfs3_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
		  u64 cookie, struct page *page, unsigned int count, int plus)
{
	struct inode		*dir = dentry->d_inode;
	struct nfs_fattr	dir_attr;
	u32			*verf = NFS_COOKIEVERF(dir);
	struct nfs3_readdirargs	arg = {
		.fh		= NFS_FH(dir),
		.cookie		= cookie,
		.verf		= {verf[0], verf[1]},
		.plus		= plus,
		.count		= count,
		.pages		= &page
	};
	struct nfs3_readdirres	res = {
		.dir_attr	= &dir_attr,
		.verf		= verf,
		.plus		= plus
	};
	struct rpc_message	msg = {
		.rpc_proc	= &nfs3_procedures[NFS3PROC_READDIR],
		.rpc_argp	= &arg,
		.rpc_resp	= &res,
		.rpc_cred	= cred
	};
	int			status;

	lock_kernel();

	if (plus)
		msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];

	dprintk("NFS call  readdir%s %d\n",
			plus? "plus" : "", (unsigned int) cookie);

	dir_attr.valid = 0;
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	nfs_refresh_inode(dir, &dir_attr);
	dprintk("NFS reply readdir: %d\n", status);
	unlock_kernel();
	return status;
}

static int
nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
		dev_t rdev)
{
	struct nfs_fh fh;
	struct nfs_fattr fattr, dir_attr;
	struct nfs3_mknodargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= dentry->d_name.name,
		.len		= dentry->d_name.len,
		.sattr		= sattr,
		.rdev		= rdev
	};
	struct nfs3_diropres	res = {
		.dir_attr	= &dir_attr,
		.fh		= &fh,
		.fattr		= &fattr
	};
	mode_t mode = sattr->ia_mode;
	int status;

	switch (sattr->ia_mode & S_IFMT) {
	case S_IFBLK:	arg.type = NF3BLK;  break;
	case S_IFCHR:	arg.type = NF3CHR;  break;
	case S_IFIFO:	arg.type = NF3FIFO; break;
	case S_IFSOCK:	arg.type = NF3SOCK; break;
	default:	return -EINVAL;
	}

	dprintk("NFS call  mknod %s %u:%u\n", dentry->d_name.name,
			MAJOR(rdev), MINOR(rdev));

	sattr->ia_mode &= ~current->fs->umask;

	dir_attr.valid = 0;
	fattr.valid = 0;
	status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKNOD, &arg, &res, 0);
	nfs_refresh_inode(dir, &dir_attr);
	if (status != 0)
		goto out;
	status = nfs_instantiate(dentry, &fh, &fattr);
	if (status != 0)
		goto out;
	status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
out:
	dprintk("NFS reply mknod: %d\n", status);
	return status;
}

static int
nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
		 struct nfs_fsstat *stat)
{
	int	status;

	dprintk("NFS call  fsstat\n");
	stat->fattr->valid = 0;
	status = rpc_call(server->client, NFS3PROC_FSSTAT, fhandle, stat, 0);
	dprintk("NFS reply statfs: %d\n", status);
	return status;
}

static int
nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
		 struct nfs_fsinfo *info)
{
	int	status;

	dprintk("NFS call  fsinfo\n");
	info->fattr->valid = 0;
	status = rpc_call(server->client_sys, NFS3PROC_FSINFO, fhandle, info, 0);
	dprintk("NFS reply fsinfo: %d\n", status);
	return status;
}

static int
nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
		   struct nfs_pathconf *info)
{
	int	status;

	dprintk("NFS call  pathconf\n");
	info->fattr->valid = 0;
	status = rpc_call(server->client, NFS3PROC_PATHCONF, fhandle, info, 0);
	dprintk("NFS reply pathconf: %d\n", status);
	return status;
}

extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int);

static void
nfs3_read_done(struct rpc_task *task)
{
	struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;

	if (nfs3_async_handle_jukebox(task))
		return;
	/* Call back common NFS readpage processing */
	if (task->tk_status >= 0)
		nfs_refresh_inode(data->inode, &data->fattr);
	nfs_readpage_result(task);
}

static void
nfs3_proc_read_setup(struct nfs_read_data *data)
{
	struct rpc_task		*task = &data->task;
	struct inode		*inode = data->inode;
	int			flags;
	struct rpc_message	msg = {
		.rpc_proc	= &nfs3_procedures[NFS3PROC_READ],
		.rpc_argp	= &data->args,
		.rpc_resp	= &data->res,
		.rpc_cred	= data->cred,
	};

	/* N.B. Do we need to test? Never called for swapfile inode */
	flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);

	/* Finalize the task. */
	rpc_init_task(task, NFS_CLIENT(inode), nfs3_read_done, flags);
	rpc_call_setup(task, &msg, 0);
}

static void
nfs3_write_done(struct rpc_task *task)
{
	struct nfs_write_data *data;

	if (nfs3_async_handle_jukebox(task))
		return;
	data = (struct nfs_write_data *)task->tk_calldata;
	if (task->tk_status >= 0)
		nfs_refresh_inode(data->inode, data->res.fattr);
	nfs_writeback_done(task);
}

static void
nfs3_proc_write_setup(struct nfs_write_data *data, int how)
{
	struct rpc_task		*task = &data->task;
	struct inode		*inode = data->inode;
	int			stable;
	int			flags;
	struct rpc_message	msg = {
		.rpc_proc	= &nfs3_procedures[NFS3PROC_WRITE],
		.rpc_argp	= &data->args,
		.rpc_resp	= &data->res,
		.rpc_cred	= data->cred,
	};

	if (how & FLUSH_STABLE) {
		if (!NFS_I(inode)->ncommit)
			stable = NFS_FILE_SYNC;
		else
			stable = NFS_DATA_SYNC;
	} else
		stable = NFS_UNSTABLE;
	data->args.stable = stable;

	/* Set the initial flags for the task.  */
	flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;

	/* Finalize the task. */
	rpc_init_task(task, NFS_CLIENT(inode), nfs3_write_done, flags);
	rpc_call_setup(task, &msg, 0);
}

static void
nfs3_commit_done(struct rpc_task *task)
{
	struct nfs_write_data *data;

	if (nfs3_async_handle_jukebox(task))
		return;
	data = (struct nfs_write_data *)task->tk_calldata;
	if (task->tk_status >= 0)
		nfs_refresh_inode(data->inode, data->res.fattr);
	nfs_commit_done(task);
}

static void
nfs3_proc_commit_setup(struct nfs_write_data *data, int how)
{
	struct rpc_task		*task = &data->task;
	struct inode		*inode = data->inode;
	int			flags;
	struct rpc_message	msg = {
		.rpc_proc	= &nfs3_procedures[NFS3PROC_COMMIT],
		.rpc_argp	= &data->args,
		.rpc_resp	= &data->res,
		.rpc_cred	= data->cred,
	};

	/* Set the initial flags for the task.  */
	flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;

	/* Finalize the task. */
	rpc_init_task(task, NFS_CLIENT(inode), nfs3_commit_done, flags);
	rpc_call_setup(task, &msg, 0);
}

static int
nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
{
	return nlmclnt_proc(filp->f_dentry->d_inode, cmd, fl);
}

struct nfs_rpc_ops	nfs_v3_clientops = {
	.version	= 3,			/* protocol version */
	.dentry_ops	= &nfs_dentry_operations,
	.dir_inode_ops	= &nfs3_dir_inode_operations,
	.file_inode_ops	= &nfs3_file_inode_operations,
	.getroot	= nfs3_proc_get_root,
	.getattr	= nfs3_proc_getattr,
	.setattr	= nfs3_proc_setattr,
	.lookup		= nfs3_proc_lookup,
	.access		= nfs3_proc_access,
	.readlink	= nfs3_proc_readlink,
	.read		= nfs3_proc_read,
	.write		= nfs3_proc_write,
	.commit		= nfs3_proc_commit,
	.create		= nfs3_proc_create,
	.remove		= nfs3_proc_remove,
	.unlink_setup	= nfs3_proc_unlink_setup,
	.unlink_done	= nfs3_proc_unlink_done,
	.rename		= nfs3_proc_rename,
	.link		= nfs3_proc_link,
	.symlink	= nfs3_proc_symlink,
	.mkdir		= nfs3_proc_mkdir,
	.rmdir		= nfs3_proc_rmdir,
	.readdir	= nfs3_proc_readdir,
	.mknod		= nfs3_proc_mknod,
	.statfs		= nfs3_proc_statfs,
	.fsinfo		= nfs3_proc_fsinfo,
	.pathconf	= nfs3_proc_pathconf,
	.decode_dirent	= nfs3_decode_dirent,
	.read_setup	= nfs3_proc_read_setup,
	.write_setup	= nfs3_proc_write_setup,
	.commit_setup	= nfs3_proc_commit_setup,
	.file_open	= nfs_open,
	.file_release	= nfs_release,
	.lock		= nfs3_proc_lock,
};