aboutsummaryrefslogtreecommitdiffstats
path: root/fs/nfsd/nfs3proc.c
blob: a5ebc7dbb3842d7d1a3f9a7de6256831a07d026b (plain) (blame)
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
/*
 * linux/fs/nfsd/nfs3proc.c
 *
 * Process version 3 NFS requests.
 *
 * Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/linkage.h>
#include <linux/time.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/major.h>

#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr3.h>
#include <linux/nfs3.h>

#define NFSDDBG_FACILITY		NFSDDBG_PROC

#define RETURN_STATUS(st)	{ resp->status = (st); return (st); }

static int	nfs3_ftypes[] = {
	0,			/* NF3NON */
	S_IFREG,		/* NF3REG */
	S_IFDIR,		/* NF3DIR */
	S_IFBLK,		/* NF3BLK */
	S_IFCHR,		/* NF3CHR */
	S_IFLNK,		/* NF3LNK */
	S_IFSOCK,		/* NF3SOCK */
	S_IFIFO,		/* NF3FIFO */
};

/*
 * NULL call.
 */
static int
nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
	return nfs_ok;
}

/*
 * Get a file's attributes
 */
static int
nfsd3_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle  *argp,
					   struct nfsd3_attrstat *resp)
{
	int	err, nfserr;

	dprintk("nfsd: GETATTR(3)  %s\n",
		SVCFH_fmt(&argp->fh));

	fh_copy(&resp->fh, &argp->fh);
	nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP);
	if (nfserr)
		RETURN_STATUS(nfserr);

	err = vfs_getattr(resp->fh.fh_export->ex_mnt,
			  resp->fh.fh_dentry, &resp->stat);
	nfserr = nfserrno(err);

	RETURN_STATUS(nfserr);
}

/*
 * Set a file's attributes
 */
static int
nfsd3_proc_setattr(struct svc_rqst *rqstp, struct nfsd3_sattrargs *argp,
					   struct nfsd3_attrstat  *resp)
{
	int	nfserr;

	dprintk("nfsd: SETATTR(3)  %s\n",
				SVCFH_fmt(&argp->fh));

	fh_copy(&resp->fh, &argp->fh);
	nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,
			      argp->check_guard, argp->guardtime);
	RETURN_STATUS(nfserr);
}

/*
 * Look up a path name component
 */
static int
nfsd3_proc_lookup(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp,
					  struct nfsd3_diropres  *resp)
{
	int	nfserr;

	dprintk("nfsd: LOOKUP(3)   %s %.*s\n",
				SVCFH_fmt(&argp->fh),
				argp->len,
				argp->name);

	fh_copy(&resp->dirfh, &argp->fh);
	fh_init(&resp->fh, NFS3_FHSIZE);

	nfserr = nfsd_lookup(rqstp, &resp->dirfh,
				    argp->name,
				    argp->len,
				    &resp->fh);
	RETURN_STATUS(nfserr);
}

/*
 * Check file access
 */
static int
nfsd3_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
					  struct nfsd3_accessres *resp)
{
	int	nfserr;

	dprintk("nfsd: ACCESS(3)   %s 0x%x\n",
				SVCFH_fmt(&argp->fh),
				argp->access);

	fh_copy(&resp->fh, &argp->fh);
	resp->access = argp->access;
	nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
	RETURN_STATUS(nfserr);
}

/*
 * Read a symlink.
 */
static int
nfsd3_proc_readlink(struct svc_rqst *rqstp, struct nfsd3_readlinkargs *argp,
					   struct nfsd3_readlinkres *resp)
{
	int nfserr;

	dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));

	/* Read the symlink. */
	fh_copy(&resp->fh, &argp->fh);
	resp->len = NFS3_MAXPATHLEN;
	nfserr = nfsd_readlink(rqstp, &resp->fh, argp->buffer, &resp->len);
	RETURN_STATUS(nfserr);
}

/*
 * Read a portion of a file.
 */
static int
nfsd3_proc_read(struct svc_rqst *rqstp, struct nfsd3_readargs *argp,
				        struct nfsd3_readres  *resp)
{
	int	nfserr;
	u32	max_blocksize = svc_max_payload(rqstp);

	dprintk("nfsd: READ(3) %s %lu bytes at %lu\n",
				SVCFH_fmt(&argp->fh),
				(unsigned long) argp->count,
				(unsigned long) argp->offset);

	/* Obtain buffer pointer for payload.
	 * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
	 * + 1 (xdr opaque byte count) = 26
	 */

	resp->count = argp->count;
	if (max_blocksize < resp->count)
		resp->count = max_blocksize;

	svc_reserve(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);

	fh_copy(&resp->fh, &argp->fh);
	nfserr = nfsd_read(rqstp, &resp->fh, NULL,
				  argp->offset,
			   	  rqstp->rq_vec, argp->vlen,
				  &resp->count);
	if (nfserr == 0) {
		struct inode	*inode = resp->fh.fh_dentry->d_inode;

		resp->eof = (argp->offset + resp->count) >= inode->i_size;
	}

	RETURN_STATUS(nfserr);
}

/*
 * Write data to a file
 */
static int
nfsd3_proc_write(struct svc_rqst *rqstp, struct nfsd3_writeargs *argp,
					 struct nfsd3_writeres  *resp)
{
	int	nfserr;

	dprintk("nfsd: WRITE(3)    %s %d bytes at %ld%s\n",
				SVCFH_fmt(&argp->fh),
				argp->len,
				(unsigned long) argp->offset,
				argp->stable? " stable" : "");

	fh_copy(&resp->fh, &argp->fh);
	resp->committed = argp->stable;
	nfserr = nfsd_write(rqstp, &resp->fh, NULL,
				   argp->offset,
				   rqstp->rq_vec, argp->vlen,
				   argp->len,
				   &resp->committed);
	resp->count = argp->count;
	RETURN_STATUS(nfserr);
}

/*
 * With NFSv3, CREATE processing is a lot easier than with NFSv2.
 * At least in theory; we'll see how it fares in practice when the
 * first reports about SunOS compatibility problems start to pour in...
 */
static int
nfsd3_proc_create(struct svc_rqst *rqstp, struct nfsd3_createargs *argp,
					  struct nfsd3_diropres   *resp)
{
	svc_fh		*dirfhp, *newfhp = NULL;
	struct iattr	*attr;
	u32		nfserr;

	dprintk("nfsd: CREATE(3)   %s %.*s\n",
				SVCFH_fmt(&argp->fh),
				argp->len,
				argp->name);

	dirfhp = fh_copy(&resp->dirfh, &argp->fh);
	newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
	attr   = &argp->attrs;

	/* Get the directory inode */
	nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, MAY_CREATE);
	if (nfserr)
		RETURN_STATUS(nfserr);

	/* Unfudge the mode bits */
	attr->ia_mode &= ~S_IFMT;
	if (!(attr->ia_valid & ATTR_MODE)) { 
		attr->ia_valid |= ATTR_MODE;
		attr->ia_mode = S_IFREG;
	} else {
		attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
	}

	/* Now create the file and set attributes */
	nfserr = nfsd_create_v3(rqstp, dirfhp, argp->name, argp->len,
				attr, newfhp,
				argp->createmode, argp->verf, NULL);

	RETURN_STATUS(nfserr);
}

/*
 * Make directory. This operation is not idempotent.
 */
static int
nfsd3_proc_mkdir(struct svc_rqst *rqstp, struct nfsd3_createargs *argp,
					 struct nfsd3_diropres   *resp)
{
	int	nfserr;

	dprintk("nfsd: MKDIR(3)    %s %.*s\n",
				SVCFH_fmt(&argp->fh),
				argp->len,
				argp->name);

	argp->attrs.ia_valid &= ~ATTR_SIZE;
	fh_copy(&resp->dirfh, &argp->fh);
	fh_init(&resp->fh, NFS3_FHSIZE);
	nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
				    &argp->attrs, S_IFDIR, 0, &resp->fh);

	RETURN_STATUS(nfserr);
}

static int
nfsd3_proc_symlink(struct svc_rqst *rqstp, struct nfsd3_symlinkargs *argp,
					   struct nfsd3_diropres    *resp)
{
	int	nfserr;

	dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
				SVCFH_fmt(&argp->ffh),
				argp->flen, argp->fname,
				argp->tlen, argp->tname);

	fh_copy(&resp->dirfh, &argp->ffh);
	fh_init(&resp->fh, NFS3_FHSIZE);
	nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
						   argp->tname, argp->tlen,
						   &resp->fh, &argp->attrs);
	RETURN_STATUS(nfserr);
}

/*
 * Make socket/fifo/device.
 */
static int
nfsd3_proc_mknod(struct svc_rqst *rqstp, struct nfsd3_mknodargs *argp,
					 struct nfsd3_diropres  *resp)
{
	int	nfserr, type;
	dev_t	rdev = 0;

	dprintk("nfsd: MKNOD(3)    %s %.*s\n",
				SVCFH_fmt(&argp->fh),
				argp->len,
				argp->name);

	fh_copy(&resp->dirfh, &argp->fh);
	fh_init(&resp->fh, NFS3_FHSIZE);

	if (argp->ftype == 0 || argp->ftype >= NF3BAD)
		RETURN_STATUS(nfserr_inval);
	if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
		rdev = MKDEV(argp->major, argp->minor);
		if (MAJOR(rdev) != argp->major ||
		    MINOR(rdev) != argp->minor)
			RETURN_STATUS(nfserr_inval);
	} else
		if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
			RETURN_STATUS(nfserr_inval);

	type = nfs3_ftypes[argp->ftype];
	nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
				    &argp->attrs, type, rdev, &resp->fh);

	RETURN_STATUS(nfserr);
}

/*
 * Remove file/fifo/socket etc.
 */
static int
nfsd3_proc_remove(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp,
					  struct nfsd3_attrstat  *resp)
{
	int	nfserr;

	dprintk("nfsd: REMOVE(3)   %s %.*s\n",
				SVCFH_fmt(&argp->fh),
				argp->len,
				argp->name);

	/* Unlink. -S_IFDIR means file must not be a directory */
	fh_copy(&resp->fh, &argp->fh);
	nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
	RETURN_STATUS(nfserr);
}

/*
 * Remove a directory
 */
static int
nfsd3_proc_rmdir(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp,
					 struct nfsd3_attrstat  *resp)
{
	int	nfserr;

	dprintk("nfsd: RMDIR(3)    %s %.*s\n",
				SVCFH_fmt(&argp->fh),
				argp->len,
				argp->name);

	fh_copy(&resp->fh, &argp->fh);
	nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
	RETURN_STATUS(nfserr);
}

static int
nfsd3_proc_rename(struct svc_rqst *rqstp, struct nfsd3_renameargs *argp,
					  struct nfsd3_renameres  *resp)
{
	int	nfserr;

	dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
				SVCFH_fmt(&argp->ffh),
				argp->flen,
				argp->fname);
	dprintk("nfsd: -> %s %.*s\n",
				SVCFH_fmt(&argp->tfh),
				argp->tlen,
				argp->tname);

	fh_copy(&resp->ffh, &argp->ffh);
	fh_copy(&resp->tfh, &argp->tfh);
	nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
				    &resp->tfh, argp->tname, argp->tlen);
	RETURN_STATUS(nfserr);
}

static int
nfsd3_proc_link(struct svc_rqst *rqstp, struct nfsd3_linkargs *argp,
					struct nfsd3_linkres  *resp)
{
	int	nfserr;

	dprintk("nfsd: LINK(3)     %s ->\n",
				SVCFH_fmt(&argp->ffh));
	dprintk("nfsd:   -> %s %.*s\n",
				SVCFH_fmt(&argp->tfh),
				argp->tlen,
				argp->tname);

	fh_copy(&resp->fh,  &argp->ffh);
	fh_copy(&resp->tfh, &argp->tfh);
	nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
				  &resp->fh);
	RETURN_STATUS(nfserr);
}

/*
 * Read a portion of a directory.
 */
static int
nfsd3_proc_readdir(struct svc_rqst *rqstp, struct nfsd3_readdirargs *argp,
					   struct nfsd3_readdirres  *resp)
{
	int		nfserr, count;

	dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
				SVCFH_fmt(&argp->fh),
				argp->count, (u32) argp->cookie);

	/* Make sure we've room for the NULL ptr & eof flag, and shrink to
	 * client read size */
	count = (argp->count >> 2) - 2;

	/* Read directory and encode entries on the fly */
	fh_copy(&resp->fh, &argp->fh);

	resp->buflen = count;
	resp->common.err = nfs_ok;
	resp->buffer = argp->buffer;
	resp->rqstp = rqstp;
	nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie, 
					&resp->common, nfs3svc_encode_entry);
	memcpy(resp->verf, argp->verf, 8);
	resp->count = resp->buffer - argp->buffer;
	if (resp->offset)
		xdr_encode_hyper(resp->offset, argp->cookie);

	RETURN_STATUS(nfserr);
}

/*
 * Read a portion of a directory, including file handles and attrs.
 * For now, we choose to ignore the dircount parameter.
 */
static int
nfsd3_proc_readdirplus(struct svc_rqst *rqstp, struct nfsd3_readdirargs *argp,
					       struct nfsd3_readdirres  *resp)
{
	int	nfserr, count = 0;
	loff_t	offset;
	int	i;
	caddr_t	page_addr = NULL;

	dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
				SVCFH_fmt(&argp->fh),
				argp->count, (u32) argp->cookie);

	/* Convert byte count to number of words (i.e. >> 2),
	 * and reserve room for the NULL ptr & eof flag (-2 words) */
	resp->count = (argp->count >> 2) - 2;

	/* Read directory and encode entries on the fly */
	fh_copy(&resp->fh, &argp->fh);

	resp->common.err = nfs_ok;
	resp->buffer = argp->buffer;
	resp->buflen = resp->count;
	resp->rqstp = rqstp;
	offset = argp->cookie;
	nfserr = nfsd_readdir(rqstp, &resp->fh,
				     &offset,
				     &resp->common,
				     nfs3svc_encode_entry_plus);
	memcpy(resp->verf, argp->verf, 8);
	for (i=1; i<rqstp->rq_resused ; i++) {
		page_addr = page_address(rqstp->rq_respages[i]);

		if (((caddr_t)resp->buffer >= page_addr) &&
		    ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
			count += (caddr_t)resp->buffer - page_addr;
			break;
		}
		count += PAGE_SIZE;
	}
	resp->count = count >> 2;
	if (resp->offset) {
		if (unlikely(resp->offset1)) {
			/* we ended up with offset on a page boundary */
			*resp->offset = htonl(offset >> 32);
			*resp->offset1 = htonl(offset & 0xffffffff);
			resp->offset1 = NULL;
		} else {
			xdr_encode_hyper(resp->offset, offset);
		}
	}

	RETURN_STATUS(nfserr);
}

/*
 * Get file system stats
 */
static int
nfsd3_proc_fsstat(struct svc_rqst * rqstp, struct nfsd_fhandle    *argp,
					   struct nfsd3_fsstatres *resp)
{
	int	nfserr;

	dprintk("nfsd: FSSTAT(3)   %s\n",
				SVCFH_fmt(&argp->fh));

	nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats);
	fh_put(&argp->fh);
	RETURN_STATUS(nfserr);
}

/*
 * Get file system info
 */
static int
nfsd3_proc_fsinfo(struct svc_rqst * rqstp, struct nfsd_fhandle    *argp,
					   struct nfsd3_fsinfores *resp)
{
	int	nfserr;
	u32	max_blocksize = svc_max_payload(rqstp);

	dprintk("nfsd: FSINFO(3)   %s\n",
				SVCFH_fmt(&argp->fh));

	resp->f_rtmax  = max_blocksize;
	resp->f_rtpref = max_blocksize;
	resp->f_rtmult = PAGE_SIZE;
	resp->f_wtmax  = max_blocksize;
	resp->f_wtpref = max_blocksize;
	resp->f_wtmult = PAGE_SIZE;
	resp->f_dtpref = PAGE_SIZE;
	resp->f_maxfilesize = ~(u32) 0;
	resp->f_properties = NFS3_FSF_DEFAULT;

	nfserr = fh_verify(rqstp, &argp->fh, 0, MAY_NOP);

	/* Check special features of the file system. May request
	 * different read/write sizes for file systems known to have
	 * problems with large blocks */
	if (nfserr == 0) {
		struct super_block *sb = argp->fh.fh_dentry->d_inode->i_sb;

		/* Note that we don't care for remote fs's here */
		if (sb->s_magic == 0x4d44 /* MSDOS_SUPER_MAGIC */) {
			resp->f_properties = NFS3_FSF_BILLYBOY;
		}
		resp->f_maxfilesize = sb->s_maxbytes;
	}

	fh_put(&argp->fh);
	RETURN_STATUS(nfserr);
}

/*
 * Get pathconf info for the specified file
 */
static int
nfsd3_proc_pathconf(struct svc_rqst * rqstp, struct nfsd_fhandle      *argp,
					     struct nfsd3_pathconfres *resp)
{
	int	nfserr;

	dprintk("nfsd: PATHCONF(3) %s\n",
				SVCFH_fmt(&argp->fh));

	/* Set default pathconf */
	resp->p_link_max = 255;		/* at least */
	resp->p_name_max = 255;		/* at least */
	resp->p_no_trunc = 0;
	resp->p_chown_restricted = 1;
	resp->p_case_insensitive = 0;
	resp->p_case_preserving = 1;

	nfserr = fh_verify(rqstp, &argp->fh, 0, MAY_NOP);

	if (nfserr == 0) {
		struct super_block *sb = argp->fh.fh_dentry->d_inode->i_sb;

		/* Note that we don't care for remote fs's here */
		switch (sb->s_magic) {
		case EXT2_SUPER_MAGIC:
			resp->p_link_max = EXT2_LINK_MAX;
			resp->p_name_max = EXT2_NAME_LEN;
			break;
		case 0x4d44:	/* MSDOS_SUPER_MAGIC */
			resp->p_case_insensitive = 1;
			resp->p_case_preserving  = 0;
			break;
		}
	}

	fh_put(&argp->fh);
	RETURN_STATUS(nfserr);
}


/*
 * Commit a file (range) to stable storage.
 */
static int
nfsd3_proc_commit(struct svc_rqst * rqstp, struct nfsd3_commitargs *argp,
					   struct nfsd3_commitres  *resp)
{
	int	nfserr;

	dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
				SVCFH_fmt(&argp->fh),
				argp->count,
				(unsigned long long) argp->offset);

	if (argp->offset > NFS_OFFSET_MAX)
		RETURN_STATUS(nfserr_inval);

	fh_copy(&resp->fh, &argp->fh);
	nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);

	RETURN_STATUS(nfserr);
}


/*
 * NFSv3 Server procedures.
 * Only the results of non-idempotent operations are cached.
 */
#define nfs3svc_decode_voidargs		NULL
#define nfs3svc_release_void		NULL
#define nfs3svc_decode_fhandleargs	nfs3svc_decode_fhandle
#define nfs3svc_encode_attrstatres	nfs3svc_encode_attrstat
#define nfs3svc_encode_wccstatres	nfs3svc_encode_wccstat
#define nfsd3_mkdirargs			nfsd3_createargs
#define nfsd3_readdirplusargs		nfsd3_readdirargs
#define nfsd3_fhandleargs		nfsd_fhandle
#define nfsd3_fhandleres		nfsd3_attrstat
#define nfsd3_attrstatres		nfsd3_attrstat
#define nfsd3_wccstatres		nfsd3_attrstat
#define nfsd3_createres			nfsd3_diropres
#define nfsd3_voidres			nfsd3_voidargs
struct nfsd3_voidargs { int dummy; };

#define PROC(name, argt, rest, relt, cache, respsize)	\
 { (svc_procfunc) nfsd3_proc_##name,		\
   (kxdrproc_t) nfs3svc_decode_##argt##args,	\
   (kxdrproc_t) nfs3svc_encode_##rest##res,	\
   (kxdrproc_t) nfs3svc_release_##relt,		\
   sizeof(struct nfsd3_##argt##args),		\
   sizeof(struct nfsd3_##rest##res),		\
   0,						\
   cache,					\
   respsize,					\
 }

#define ST 1		/* status*/
#define FH 17		/* filehandle with length */
#define AT 21		/* attributes */
#define pAT (1+AT)	/* post attributes - conditional */
#define WC (7+pAT)	/* WCC attributes */

static struct svc_procedure		nfsd_procedures3[22] = {
  PROC(null,	 void,		void,		void,	  RC_NOCACHE, ST),
  PROC(getattr,	 fhandle,	attrstat,	fhandle,  RC_NOCACHE, ST+AT),
  PROC(setattr,  sattr,		wccstat,	fhandle,  RC_REPLBUFF, ST+WC),
  PROC(lookup,	 dirop,		dirop,		fhandle2, RC_NOCACHE, ST+FH+pAT+pAT),
  PROC(access,	 access,	access,		fhandle,  RC_NOCACHE, ST+pAT+1),
  PROC(readlink, readlink,	readlink,	fhandle,  RC_NOCACHE, ST+pAT+1+NFS3_MAXPATHLEN/4),
  PROC(read,	 read,		read,		fhandle,  RC_NOCACHE, ST+pAT+4+NFSSVC_MAXBLKSIZE/4),
  PROC(write,	 write,		write,		fhandle,  RC_REPLBUFF, ST+WC+4),
  PROC(create,	 create,	create,		fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC),
  PROC(mkdir,	 mkdir,		create,		fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC),
  PROC(symlink,	 symlink,	create,		fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC),
  PROC(mknod,	 mknod,		create,		fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC),
  PROC(remove,	 dirop,		wccstat,	fhandle,  RC_REPLBUFF, ST+WC),
  PROC(rmdir,	 dirop,		wccstat,	fhandle,  RC_REPLBUFF, ST+WC),
  PROC(rename,	 rename,	rename,		fhandle2, RC_REPLBUFF, ST+WC+WC),
  PROC(link,	 link,		link,		fhandle2, RC_REPLBUFF, ST+pAT+WC),
  PROC(readdir,	 readdir,	readdir,	fhandle,  RC_NOCACHE, 0),
  PROC(readdirplus,readdirplus,	readdir,	fhandle,  RC_NOCACHE, 0),
  PROC(fsstat,	 fhandle,	fsstat,		void,     RC_NOCACHE, ST+pAT+2*6+1),
  PROC(fsinfo,   fhandle,	fsinfo,		void,     RC_NOCACHE, ST+pAT+12),
  PROC(pathconf, fhandle,	pathconf,	void,     RC_NOCACHE, ST+pAT+6),
  PROC(commit,	 commit,	commit,		fhandle,  RC_NOCACHE, ST+WC+2),
};

struct svc_version	nfsd_version3 = {
		.vs_vers	= 3,
		.vs_nproc	= 22,
		.vs_proc	= nfsd_procedures3,
		.vs_dispatch	= nfsd_dispatch,
		.vs_xdrsize	= NFS3_SVC_XDRSIZE,
};