summaryrefslogtreecommitdiffstats
path: root/fs/nfsd/nfsproc.c
blob: 4cd78ef4c95c4def33831856e863a36fc850ff59 (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
/*
 * Process version 2 NFS requests.
 *
 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/namei.h>

#include "cache.h"
#include "xdr.h"
#include "vfs.h"

typedef struct svc_rqst	svc_rqst;
typedef struct svc_buf	svc_buf;

#define NFSDDBG_FACILITY		NFSDDBG_PROC


static __be32
nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
	return nfs_ok;
}

static __be32
nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
{
	if (err) return err;
	return fh_getattr(&resp->fh, &resp->stat);
}
static __be32
nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
{
	if (err) return err;
	return fh_getattr(&resp->fh, &resp->stat);
}
/*
 * Get a file's attributes
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle  *argp,
					  struct nfsd_attrstat *resp)
{
	__be32 nfserr;
	dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));

	fh_copy(&resp->fh, &argp->fh);
	nfserr = fh_verify(rqstp, &resp->fh, 0,
			NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
	return nfsd_return_attrs(nfserr, resp);
}

/*
 * Set a file's attributes
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
					  struct nfsd_attrstat  *resp)
{
	struct iattr *iap = &argp->attrs;
	struct svc_fh *fhp;
	__be32 nfserr;

	dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
		SVCFH_fmt(&argp->fh),
		argp->attrs.ia_valid, (long) argp->attrs.ia_size);

	fhp = fh_copy(&resp->fh, &argp->fh);

	/*
	 * NFSv2 does not differentiate between "set-[ac]time-to-now"
	 * which only requires access, and "set-[ac]time-to-X" which
	 * requires ownership.
	 * So if it looks like it might be "set both to the same time which
	 * is close to now", and if inode_change_ok fails, then we
	 * convert to "set to now" instead of "set to explicit time"
	 *
	 * We only call inode_change_ok as the last test as technically
	 * it is not an interface that we should be using.
	 */
#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
#define	MAX_TOUCH_TIME_ERROR (30*60)
	if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
	    iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
		/*
		 * Looks probable.
		 *
		 * Now just make sure time is in the right ballpark.
		 * Solaris, at least, doesn't seem to care what the time
		 * request is.  We require it be within 30 minutes of now.
		 */
		time_t delta = iap->ia_atime.tv_sec - get_seconds();
		struct inode *inode;

		nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
		if (nfserr)
			goto done;
		inode = d_inode(fhp->fh_dentry);

		if (delta < 0)
			delta = -delta;
		if (delta < MAX_TOUCH_TIME_ERROR &&
		    inode_change_ok(inode, iap) != 0) {
			/*
			 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
			 * This will cause notify_change to set these times
			 * to "now"
			 */
			iap->ia_valid &= ~BOTH_TIME_SET;
		}
	}

	nfserr = nfsd_setattr(rqstp, fhp, iap, 0, (time_t)0);
done:
	return nfsd_return_attrs(nfserr, resp);
}

/*
 * Look up a path name component
 * Note: the dentry in the resp->fh may be negative if the file
 * doesn't exist yet.
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
					 struct nfsd_diropres  *resp)
{
	__be32	nfserr;

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

	fh_init(&resp->fh, NFS_FHSIZE);
	nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
				 &resp->fh);

	fh_put(&argp->fh);
	return nfsd_return_dirop(nfserr, resp);
}

/*
 * Read a symlink.
 */
static __be32
nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
					   struct nfsd_readlinkres *resp)
{
	__be32	nfserr;

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

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

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

/*
 * Read a portion of a file.
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
				       struct nfsd_readres  *resp)
{
	__be32	nfserr;

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

	/* Obtain buffer pointer for payload. 19 is 1 word for
	 * status, 17 words for fattr, and 1 word for the byte count.
	 */

	if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
		char buf[RPC_MAX_ADDRBUFLEN];
		printk(KERN_NOTICE
			"oversized read request from %s (%d bytes)\n",
				svc_print_addr(rqstp, buf, sizeof(buf)),
				argp->count);
		argp->count = NFSSVC_MAXBLKSIZE_V2;
	}
	svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);

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

	if (nfserr) return nfserr;
	return fh_getattr(&resp->fh, &resp->stat);
}

/*
 * Write data to a file
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
					struct nfsd_attrstat  *resp)
{
	__be32	nfserr;
	int	stable = 1;
	unsigned long cnt = argp->len;

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

	nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
				   argp->offset,
				   rqstp->rq_vec, argp->vlen,
			           &cnt,
				   &stable);
	return nfsd_return_attrs(nfserr, resp);
}

/*
 * CREATE processing is complicated. The keyword here is `overloaded.'
 * The parent directory is kept locked between the check for existence
 * and the actual create() call in compliance with VFS protocols.
 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 */
static __be32
nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
					 struct nfsd_diropres   *resp)
{
	svc_fh		*dirfhp = &argp->fh;
	svc_fh		*newfhp = &resp->fh;
	struct iattr	*attr = &argp->attrs;
	struct inode	*inode;
	struct dentry	*dchild;
	int		type, mode;
	__be32		nfserr;
	int		hosterr;
	dev_t		rdev = 0, wanted = new_decode_dev(attr->ia_size);

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

	/* First verify the parent file handle */
	nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
	if (nfserr)
		goto done; /* must fh_put dirfhp even on error */

	/* Check for NFSD_MAY_WRITE in nfsd_create if necessary */

	nfserr = nfserr_acces;
	if (!argp->len)
		goto done;
	nfserr = nfserr_exist;
	if (isdotent(argp->name, argp->len))
		goto done;
	hosterr = fh_want_write(dirfhp);
	if (hosterr) {
		nfserr = nfserrno(hosterr);
		goto done;
	}

	fh_lock_nested(dirfhp, I_MUTEX_PARENT);
	dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
	if (IS_ERR(dchild)) {
		nfserr = nfserrno(PTR_ERR(dchild));
		goto out_unlock;
	}
	fh_init(newfhp, NFS_FHSIZE);
	nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
	if (!nfserr && d_really_is_negative(dchild))
		nfserr = nfserr_noent;
	dput(dchild);
	if (nfserr) {
		if (nfserr != nfserr_noent)
			goto out_unlock;
		/*
		 * If the new file handle wasn't verified, we can't tell
		 * whether the file exists or not. Time to bail ...
		 */
		nfserr = nfserr_acces;
		if (!newfhp->fh_dentry) {
			printk(KERN_WARNING 
				"nfsd_proc_create: file handle not verified\n");
			goto out_unlock;
		}
	}

	inode = d_inode(newfhp->fh_dentry);

	/* Unfudge the mode bits */
	if (attr->ia_valid & ATTR_MODE) {
		type = attr->ia_mode & S_IFMT;
		mode = attr->ia_mode & ~S_IFMT;
		if (!type) {
			/* no type, so if target exists, assume same as that,
			 * else assume a file */
			if (inode) {
				type = inode->i_mode & S_IFMT;
				switch(type) {
				case S_IFCHR:
				case S_IFBLK:
					/* reserve rdev for later checking */
					rdev = inode->i_rdev;
					attr->ia_valid |= ATTR_SIZE;

					/* FALLTHROUGH */
				case S_IFIFO:
					/* this is probably a permission check..
					 * at least IRIX implements perm checking on
					 *   echo thing > device-special-file-or-pipe
					 * by doing a CREATE with type==0
					 */
					nfserr = nfsd_permission(rqstp,
								 newfhp->fh_export,
								 newfhp->fh_dentry,
								 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
					if (nfserr && nfserr != nfserr_rofs)
						goto out_unlock;
				}
			} else
				type = S_IFREG;
		}
	} else if (inode) {
		type = inode->i_mode & S_IFMT;
		mode = inode->i_mode & ~S_IFMT;
	} else {
		type = S_IFREG;
		mode = 0;	/* ??? */
	}

	attr->ia_valid |= ATTR_MODE;
	attr->ia_mode = mode;

	/* Special treatment for non-regular files according to the
	 * gospel of sun micro
	 */
	if (type != S_IFREG) {
		if (type != S_IFBLK && type != S_IFCHR) {
			rdev = 0;
		} else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
			/* If you think you've seen the worst, grok this. */
			type = S_IFIFO;
		} else {
			/* Okay, char or block special */
			if (!rdev)
				rdev = wanted;
		}

		/* we've used the SIZE information, so discard it */
		attr->ia_valid &= ~ATTR_SIZE;

		/* Make sure the type and device matches */
		nfserr = nfserr_exist;
		if (inode && type != (inode->i_mode & S_IFMT))
			goto out_unlock;
	}

	nfserr = 0;
	if (!inode) {
		/* File doesn't exist. Create it and set attrs */
		nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
					attr, type, rdev, newfhp);
	} else if (type == S_IFREG) {
		dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
			argp->name, attr->ia_valid, (long) attr->ia_size);
		/* File already exists. We ignore all attributes except
		 * size, so that creat() behaves exactly like
		 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
		 */
		attr->ia_valid &= ATTR_SIZE;
		if (attr->ia_valid)
			nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
	}

out_unlock:
	/* We don't really need to unlock, as fh_put does it. */
	fh_unlock(dirfhp);
	fh_drop_write(dirfhp);
done:
	fh_put(dirfhp);
	return nfsd_return_dirop(nfserr, resp);
}

static __be32
nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
					 void		       *resp)
{
	__be32	nfserr;

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

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

static __be32
nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
				  	 void		        *resp)
{
	__be32	nfserr;

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

	nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
				    &argp->tfh, argp->tname, argp->tlen);
	fh_put(&argp->ffh);
	fh_put(&argp->tfh);
	return nfserr;
}

static __be32
nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
				void			    *resp)
{
	__be32	nfserr;

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

	nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
				  &argp->ffh);
	fh_put(&argp->ffh);
	fh_put(&argp->tfh);
	return nfserr;
}

static __be32
nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
				          void			  *resp)
{
	struct svc_fh	newfh;
	__be32		nfserr;

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

	fh_init(&newfh, NFS_FHSIZE);
	/*
	 * Crazy hack: the request fits in a page, and already-decoded
	 * attributes follow argp->tname, so it's safe to just write a
	 * null to ensure it's null-terminated:
	 */
	argp->tname[argp->tlen] = '\0';
	nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
						 argp->tname, &newfh);

	fh_put(&argp->ffh);
	fh_put(&newfh);
	return nfserr;
}

/*
 * Make directory. This operation is not idempotent.
 * N.B. After this call resp->fh needs an fh_put
 */
static __be32
nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
					struct nfsd_diropres   *resp)
{
	__be32	nfserr;

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

	if (resp->fh.fh_dentry) {
		printk(KERN_WARNING
			"nfsd_proc_mkdir: response already verified??\n");
	}

	argp->attrs.ia_valid &= ~ATTR_SIZE;
	fh_init(&resp->fh, NFS_FHSIZE);
	nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
				    &argp->attrs, S_IFDIR, 0, &resp->fh);
	fh_put(&argp->fh);
	return nfsd_return_dirop(nfserr, resp);
}

/*
 * Remove a directory
 */
static __be32
nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
				 	void		      *resp)
{
	__be32	nfserr;

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

	nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
	fh_put(&argp->fh);
	return nfserr;
}

/*
 * Read a portion of a directory.
 */
static __be32
nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
					  struct nfsd_readdirres  *resp)
{
	int		count;
	__be32		nfserr;
	loff_t		offset;

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

	/* Shrink to the client read size */
	count = (argp->count >> 2) - 2;

	/* Make sure we've room for the NULL ptr & eof flag */
	count -= 2;
	if (count < 0)
		count = 0;

	resp->buffer = argp->buffer;
	resp->offset = NULL;
	resp->buflen = count;
	resp->common.err = nfs_ok;
	/* Read directory and encode entries on the fly */
	offset = argp->cookie;
	nfserr = nfsd_readdir(rqstp, &argp->fh, &offset, 
			      &resp->common, nfssvc_encode_entry);

	resp->count = resp->buffer - argp->buffer;
	if (resp->offset)
		*resp->offset = htonl(offset);

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

/*
 * Get file system info
 */
static __be32
nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
					  struct nfsd_statfsres *resp)
{
	__be32	nfserr;

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

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

/*
 * NFSv2 Server procedures.
 * Only the results of non-idempotent operations are cached.
 */
struct nfsd_void { int dummy; };

#define ST 1		/* status */
#define FH 8		/* filehandle */
#define	AT 18		/* attributes */

static struct svc_procedure		nfsd_procedures2[18] = {
	[NFSPROC_NULL] = {
		.pc_func = (svc_procfunc) nfsd_proc_null,
		.pc_decode = (kxdrproc_t) nfssvc_decode_void,
		.pc_encode = (kxdrproc_t) nfssvc_encode_void,
		.pc_argsize = sizeof(struct nfsd_void),
		.pc_ressize = sizeof(struct nfsd_void),
		.pc_cachetype = RC_NOCACHE,
		.pc_xdrressize = ST,
	},
	[NFSPROC_GETATTR] = {
		.pc_func = (svc_procfunc) nfsd_proc_getattr,
		.pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
		.pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
		.pc_release = (kxdrproc_t) nfssvc_release_fhandle,
		.pc_argsize = sizeof(struct nfsd_fhandle),
		.pc_ressize = sizeof(struct nfsd_attrstat),
		.pc_cachetype = RC_NOCACHE,
		.pc_xdrressize = ST+AT,
	},
	[NFSPROC_SETATTR] = {
		.pc_func = (svc_procfunc) nfsd_proc_setattr,
		.pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
		.pc_release = (kxdrproc_t) nfssvc_release_fhandle,
		.pc_argsize = sizeof(struct nfsd_sattrargs),
		.pc_ressize = sizeof(struct nfsd_attrstat),
		.pc_cachetype = RC_REPLBUFF,
		.pc_xdrressize = ST+AT,
	},
	[NFSPROC_ROOT] = {
		.pc_decode = (kxdrproc_t) nfssvc_decode_void,
		.pc_encode = (kxdrproc_t) nfssvc_encode_void,
		.pc_argsize = sizeof(struct nfsd_void),
		.pc_ressize = sizeof(struct nfsd_void),
		.pc_cachetype = RC_NOCACHE,
		.pc_xdrressize = ST,
	},
	[NFSPROC_LOOKUP] = {
		.pc_func = (svc_procfunc) nfsd_proc_lookup,
		.pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
		.pc_release = (kxdrproc_t) nfssvc_release_fhandle,
		.pc_argsize = sizeof(struct nfsd_diropargs),
		.pc_ressize = sizeof(struct nfsd_diropres),
		.pc_cachetype = RC_NOCACHE,
		.pc_xdrressize = ST+FH+AT,
	},
	[NFSPROC_READLINK] = {
		.pc_func = (svc_procfunc) nfsd_proc_readlink,
		.pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
		.pc_argsize = sizeof(struct nfsd_readlinkargs),
		.pc_ressize = sizeof(struct nfsd_readlinkres),
		.pc_cachetype = RC_NOCACHE,
		.pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
	},
	[NFSPROC_READ] = {
		.pc_func = (svc_procfunc) nfsd_proc_read,
		.pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_readres,
		.pc_release = (kxdrproc_t) nfssvc_release_fhandle,
		.pc_argsize = sizeof(struct nfsd_readargs),
		.pc_ressize = sizeof(struct nfsd_readres),
		.pc_cachetype = RC_NOCACHE,
		.pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
	},
	[NFSPROC_WRITECACHE] = {
		.pc_decode = (kxdrproc_t) nfssvc_decode_void,
		.pc_encode = (kxdrproc_t) nfssvc_encode_void,
		.pc_argsize = sizeof(struct nfsd_void),
		.pc_ressize = sizeof(struct nfsd_void),
		.pc_cachetype = RC_NOCACHE,
		.pc_xdrressize = ST,
	},
	[NFSPROC_WRITE] = {
		.pc_func = (svc_procfunc) nfsd_proc_write,
		.pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
		.pc_release = (kxdrproc_t) nfssvc_release_fhandle,
		.pc_argsize = sizeof(struct nfsd_writeargs),
		.pc_ressize = sizeof(struct nfsd_attrstat),
		.pc_cachetype = RC_REPLBUFF,
		.pc_xdrressize = ST+AT,
	},
	[NFSPROC_CREATE] = {
		.pc_func = (svc_procfunc) nfsd_proc_create,
		.pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
		.pc_release = (kxdrproc_t) nfssvc_release_fhandle,
		.pc_argsize = sizeof(struct nfsd_createargs),
		.pc_ressize = sizeof(struct nfsd_diropres),
		.pc_cachetype = RC_REPLBUFF,
		.pc_xdrressize = ST+FH+AT,
	},
	[NFSPROC_REMOVE] = {
		.pc_func = (svc_procfunc) nfsd_proc_remove,
		.pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_void,
		.pc_argsize = sizeof(struct nfsd_diropargs),
		.pc_ressize = sizeof(struct nfsd_void),
		.pc_cachetype = RC_REPLSTAT,
		.pc_xdrressize = ST,
	},
	[NFSPROC_RENAME] = {
		.pc_func = (svc_procfunc) nfsd_proc_rename,
		.pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_void,
		.pc_argsize = sizeof(struct nfsd_renameargs),
		.pc_ressize = sizeof(struct nfsd_void),
		.pc_cachetype = RC_REPLSTAT,
		.pc_xdrressize = ST,
	},
	[NFSPROC_LINK] = {
		.pc_func = (svc_procfunc) nfsd_proc_link,
		.pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_void,
		.pc_argsize = sizeof(struct nfsd_linkargs),
		.pc_ressize = sizeof(struct nfsd_void),
		.pc_cachetype = RC_REPLSTAT,
		.pc_xdrressize = ST,
	},
	[NFSPROC_SYMLINK] = {
		.pc_func = (svc_procfunc) nfsd_proc_symlink,
		.pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_void,
		.pc_argsize = sizeof(struct nfsd_symlinkargs),
		.pc_ressize = sizeof(struct nfsd_void),
		.pc_cachetype = RC_REPLSTAT,
		.pc_xdrressize = ST,
	},
	[NFSPROC_MKDIR] = {
		.pc_func = (svc_procfunc) nfsd_proc_mkdir,
		.pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
		.pc_release = (kxdrproc_t) nfssvc_release_fhandle,
		.pc_argsize = sizeof(struct nfsd_createargs),
		.pc_ressize = sizeof(struct nfsd_diropres),
		.pc_cachetype = RC_REPLBUFF,
		.pc_xdrressize = ST+FH+AT,
	},
	[NFSPROC_RMDIR] = {
		.pc_func = (svc_procfunc) nfsd_proc_rmdir,
		.pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_void,
		.pc_argsize = sizeof(struct nfsd_diropargs),
		.pc_ressize = sizeof(struct nfsd_void),
		.pc_cachetype = RC_REPLSTAT,
		.pc_xdrressize = ST,
	},
	[NFSPROC_READDIR] = {
		.pc_func = (svc_procfunc) nfsd_proc_readdir,
		.pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
		.pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
		.pc_argsize = sizeof(struct nfsd_readdirargs),
		.pc_ressize = sizeof(struct nfsd_readdirres),
		.pc_cachetype = RC_NOCACHE,
	},
	[NFSPROC_STATFS] = {
		.pc_func = (svc_procfunc) nfsd_proc_statfs,
		.pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
		.pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
		.pc_argsize = sizeof(struct nfsd_fhandle),
		.pc_ressize = sizeof(struct nfsd_statfsres),
		.pc_cachetype = RC_NOCACHE,
		.pc_xdrressize = ST+5,
	},
};


struct svc_version	nfsd_version2 = {
		.vs_vers	= 2,
		.vs_nproc	= 18,
		.vs_proc	= nfsd_procedures2,
		.vs_dispatch	= nfsd_dispatch,
		.vs_xdrsize	= NFS2_SVC_XDRSIZE,
};

/*
 * Map errnos to NFS errnos.
 */
__be32
nfserrno (int errno)
{
	static struct {
		__be32	nfserr;
		int	syserr;
	} nfs_errtbl[] = {
		{ nfs_ok, 0 },
		{ nfserr_perm, -EPERM },
		{ nfserr_noent, -ENOENT },
		{ nfserr_io, -EIO },
		{ nfserr_nxio, -ENXIO },
		{ nfserr_fbig, -E2BIG },
		{ nfserr_acces, -EACCES },
		{ nfserr_exist, -EEXIST },
		{ nfserr_xdev, -EXDEV },
		{ nfserr_mlink, -EMLINK },
		{ nfserr_nodev, -ENODEV },
		{ nfserr_notdir, -ENOTDIR },
		{ nfserr_isdir, -EISDIR },
		{ nfserr_inval, -EINVAL },
		{ nfserr_fbig, -EFBIG },
		{ nfserr_nospc, -ENOSPC },
		{ nfserr_rofs, -EROFS },
		{ nfserr_mlink, -EMLINK },
		{ nfserr_nametoolong, -ENAMETOOLONG },
		{ nfserr_notempty, -ENOTEMPTY },
#ifdef EDQUOT
		{ nfserr_dquot, -EDQUOT },
#endif
		{ nfserr_stale, -ESTALE },
		{ nfserr_jukebox, -ETIMEDOUT },
		{ nfserr_jukebox, -ERESTARTSYS },
		{ nfserr_jukebox, -EAGAIN },
		{ nfserr_jukebox, -EWOULDBLOCK },
		{ nfserr_jukebox, -ENOMEM },
		{ nfserr_io, -ETXTBSY },
		{ nfserr_notsupp, -EOPNOTSUPP },
		{ nfserr_toosmall, -ETOOSMALL },
		{ nfserr_serverfault, -ESERVERFAULT },
		{ nfserr_serverfault, -ENFILE },
	};
	int	i;

	for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
		if (nfs_errtbl[i].syserr == errno)
			return nfs_errtbl[i].nfserr;
	}
	WARN(1, "nfsd: non-standard errno: %d\n", errno);
	return nfserr_io;
}