summaryrefslogtreecommitdiffstats
path: root/fs/nfs/nfs2xdr.c
blob: f0015fa876e14ab9fa5228d24d6252837283ddcc (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
/*
 * linux/fs/nfs/nfs2xdr.c
 *
 * XDR functions to encode/decode NFS RPC arguments and results.
 *
 * Copyright (C) 1992, 1993, 1994  Rick Sladkey
 * Copyright (C) 1996 Olaf Kirch
 * 04 Aug 1998  Ion Badulescu <ionut@cs.columbia.edu>
 * 		FIFO's need special handling in NFSv2
 */

#include <linux/param.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/utsname.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs_fs.h>

#define NFSDBG_FACILITY		NFSDBG_XDR
/* #define NFS_PARANOIA 1 */

extern int			nfs_stat_to_errno(int stat);

/* Mapping from NFS error code to "errno" error code. */
#define errno_NFSERR_IO		EIO

/*
 * Declare the space requirements for NFS arguments and replies as
 * number of 32bit-words
 */
#define NFS_fhandle_sz		(8)
#define NFS_sattr_sz		(8)
#define NFS_filename_sz		(1+(NFS2_MAXNAMLEN>>2))
#define NFS_path_sz		(1+(NFS2_MAXPATHLEN>>2))
#define NFS_fattr_sz		(17)
#define NFS_info_sz		(5)
#define NFS_entry_sz		(NFS_filename_sz+3)

#define NFS_diropargs_sz	(NFS_fhandle_sz+NFS_filename_sz)
#define NFS_sattrargs_sz	(NFS_fhandle_sz+NFS_sattr_sz)
#define NFS_readlinkargs_sz	(NFS_fhandle_sz)
#define NFS_readargs_sz		(NFS_fhandle_sz+3)
#define NFS_writeargs_sz	(NFS_fhandle_sz+4)
#define NFS_createargs_sz	(NFS_diropargs_sz+NFS_sattr_sz)
#define NFS_renameargs_sz	(NFS_diropargs_sz+NFS_diropargs_sz)
#define NFS_linkargs_sz		(NFS_fhandle_sz+NFS_diropargs_sz)
#define NFS_symlinkargs_sz	(NFS_diropargs_sz+NFS_path_sz+NFS_sattr_sz)
#define NFS_readdirargs_sz	(NFS_fhandle_sz+2)

#define NFS_attrstat_sz		(1+NFS_fattr_sz)
#define NFS_diropres_sz		(1+NFS_fhandle_sz+NFS_fattr_sz)
#define NFS_readlinkres_sz	(2)
#define NFS_readres_sz		(1+NFS_fattr_sz+1)
#define NFS_writeres_sz         (NFS_attrstat_sz)
#define NFS_stat_sz		(1)
#define NFS_readdirres_sz	(1)
#define NFS_statfsres_sz	(1+NFS_info_sz)

/*
 * Common NFS XDR functions as inlines
 */
static inline u32 *
xdr_encode_fhandle(u32 *p, struct nfs_fh *fhandle)
{
	memcpy(p, fhandle->data, NFS2_FHSIZE);
	return p + XDR_QUADLEN(NFS2_FHSIZE);
}

static inline u32 *
xdr_decode_fhandle(u32 *p, struct nfs_fh *fhandle)
{
	/* NFSv2 handles have a fixed length */
	fhandle->size = NFS2_FHSIZE;
	memcpy(fhandle->data, p, NFS2_FHSIZE);
	return p + XDR_QUADLEN(NFS2_FHSIZE);
}

static inline u32*
xdr_encode_time(u32 *p, struct timespec *timep)
{
	*p++ = htonl(timep->tv_sec);
	/* Convert nanoseconds into microseconds */
	*p++ = htonl(timep->tv_nsec ? timep->tv_nsec / 1000 : 0);
	return p;
}

static inline u32*
xdr_encode_current_server_time(u32 *p, struct timespec *timep)
{
	/*
	 * Passing the invalid value useconds=1000000 is a
	 * Sun convention for "set to current server time".
	 * It's needed to make permissions checks for the
	 * "touch" program across v2 mounts to Solaris and
	 * Irix boxes work correctly. See description of
	 * sattr in section 6.1 of "NFS Illustrated" by
	 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
	 */
	*p++ = htonl(timep->tv_sec);
	*p++ = htonl(1000000);
	return p;
}

static inline u32*
xdr_decode_time(u32 *p, struct timespec *timep)
{
	timep->tv_sec = ntohl(*p++);
	/* Convert microseconds into nanoseconds */
	timep->tv_nsec = ntohl(*p++) * 1000;
	return p;
}

static u32 *
xdr_decode_fattr(u32 *p, struct nfs_fattr *fattr)
{
	u32 rdev;
	fattr->type = (enum nfs_ftype) ntohl(*p++);
	fattr->mode = ntohl(*p++);
	fattr->nlink = ntohl(*p++);
	fattr->uid = ntohl(*p++);
	fattr->gid = ntohl(*p++);
	fattr->size = ntohl(*p++);
	fattr->du.nfs2.blocksize = ntohl(*p++);
	rdev = ntohl(*p++);
	fattr->du.nfs2.blocks = ntohl(*p++);
	fattr->fsid_u.nfs3 = ntohl(*p++);
	fattr->fileid = ntohl(*p++);
	p = xdr_decode_time(p, &fattr->atime);
	p = xdr_decode_time(p, &fattr->mtime);
	p = xdr_decode_time(p, &fattr->ctime);
	fattr->valid |= NFS_ATTR_FATTR;
	fattr->rdev = new_decode_dev(rdev);
	if (fattr->type == NFCHR && rdev == NFS2_FIFO_DEV) {
		fattr->type = NFFIFO;
		fattr->mode = (fattr->mode & ~S_IFMT) | S_IFIFO;
		fattr->rdev = 0;
	}
	return p;
}

static inline u32 *
xdr_encode_sattr(u32 *p, struct iattr *attr)
{
	const u32 not_set = __constant_htonl(0xFFFFFFFF);

	*p++ = (attr->ia_valid & ATTR_MODE) ? htonl(attr->ia_mode) : not_set;
	*p++ = (attr->ia_valid & ATTR_UID) ? htonl(attr->ia_uid) : not_set;
	*p++ = (attr->ia_valid & ATTR_GID) ? htonl(attr->ia_gid) : not_set;
	*p++ = (attr->ia_valid & ATTR_SIZE) ? htonl(attr->ia_size) : not_set;

	if (attr->ia_valid & ATTR_ATIME_SET) {
		p = xdr_encode_time(p, &attr->ia_atime);
	} else if (attr->ia_valid & ATTR_ATIME) {
		p = xdr_encode_current_server_time(p, &attr->ia_atime);
	} else {
		*p++ = not_set;
		*p++ = not_set;
	}

	if (attr->ia_valid & ATTR_MTIME_SET) {
		p = xdr_encode_time(p, &attr->ia_mtime);
	} else if (attr->ia_valid & ATTR_MTIME) {
		p = xdr_encode_current_server_time(p, &attr->ia_mtime);
	} else {
		*p++ = not_set;	
		*p++ = not_set;
	}
  	return p;
}

/*
 * NFS encode functions
 */
/*
 * Encode file handle argument
 * GETATTR, READLINK, STATFS
 */
static int
nfs_xdr_fhandle(struct rpc_rqst *req, u32 *p, struct nfs_fh *fh)
{
	p = xdr_encode_fhandle(p, fh);
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

/*
 * Encode SETATTR arguments
 */
static int
nfs_xdr_sattrargs(struct rpc_rqst *req, u32 *p, struct nfs_sattrargs *args)
{
	p = xdr_encode_fhandle(p, args->fh);
	p = xdr_encode_sattr(p, args->sattr);
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

/*
 * Encode directory ops argument
 * LOOKUP, REMOVE, RMDIR
 */
static int
nfs_xdr_diropargs(struct rpc_rqst *req, u32 *p, struct nfs_diropargs *args)
{
	p = xdr_encode_fhandle(p, args->fh);
	p = xdr_encode_array(p, args->name, args->len);
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

/*
 * Arguments to a READ call. Since we read data directly into the page
 * cache, we also set up the reply iovec here so that iov[1] points
 * exactly to the page we want to fetch.
 */
static int
nfs_xdr_readargs(struct rpc_rqst *req, u32 *p, struct nfs_readargs *args)
{
	struct rpc_auth	*auth = req->rq_task->tk_auth;
	unsigned int replen;
	u32 offset = (u32)args->offset;
	u32 count = args->count;

	p = xdr_encode_fhandle(p, args->fh);
	*p++ = htonl(offset);
	*p++ = htonl(count);
	*p++ = htonl(count);
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);

	/* Inline the page array */
	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readres_sz) << 2;
	xdr_inline_pages(&req->rq_rcv_buf, replen,
			 args->pages, args->pgbase, count);
	return 0;
}

/*
 * Decode READ reply
 */
static int
nfs_xdr_readres(struct rpc_rqst *req, u32 *p, struct nfs_readres *res)
{
	struct kvec *iov = req->rq_rcv_buf.head;
	int	status, count, recvd, hdrlen;

	if ((status = ntohl(*p++)))
		return -nfs_stat_to_errno(status);
	p = xdr_decode_fattr(p, res->fattr);

	count = ntohl(*p++);
	res->eof = 0;
	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
	if (iov->iov_len < hdrlen) {
		printk(KERN_WARNING "NFS: READ reply header overflowed:"
				"length %d > %Zu\n", hdrlen, iov->iov_len);
		return -errno_NFSERR_IO;
	} else if (iov->iov_len != hdrlen) {
		dprintk("NFS: READ header is short. iovec will be shifted.\n");
		xdr_shift_buf(&req->rq_rcv_buf, iov->iov_len - hdrlen);
	}

	recvd = req->rq_rcv_buf.len - hdrlen;
	if (count > recvd) {
		printk(KERN_WARNING "NFS: server cheating in read reply: "
			"count %d > recvd %d\n", count, recvd);
		count = recvd;
	}

	dprintk("RPC:      readres OK count %d\n", count);
	if (count < res->count)
		res->count = count;

	return count;
}


/*
 * Write arguments. Splice the buffer to be written into the iovec.
 */
static int
nfs_xdr_writeargs(struct rpc_rqst *req, u32 *p, struct nfs_writeargs *args)
{
	struct xdr_buf *sndbuf = &req->rq_snd_buf;
	u32 offset = (u32)args->offset;
	u32 count = args->count;

	p = xdr_encode_fhandle(p, args->fh);
	*p++ = htonl(offset);
	*p++ = htonl(offset);
	*p++ = htonl(count);
	*p++ = htonl(count);
	sndbuf->len = xdr_adjust_iovec(sndbuf->head, p);

	/* Copy the page array */
	xdr_encode_pages(sndbuf, args->pages, args->pgbase, count);
	return 0;
}

/*
 * Encode create arguments
 * CREATE, MKDIR
 */
static int
nfs_xdr_createargs(struct rpc_rqst *req, u32 *p, struct nfs_createargs *args)
{
	p = xdr_encode_fhandle(p, args->fh);
	p = xdr_encode_array(p, args->name, args->len);
	p = xdr_encode_sattr(p, args->sattr);
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

/*
 * Encode RENAME arguments
 */
static int
nfs_xdr_renameargs(struct rpc_rqst *req, u32 *p, struct nfs_renameargs *args)
{
	p = xdr_encode_fhandle(p, args->fromfh);
	p = xdr_encode_array(p, args->fromname, args->fromlen);
	p = xdr_encode_fhandle(p, args->tofh);
	p = xdr_encode_array(p, args->toname, args->tolen);
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

/*
 * Encode LINK arguments
 */
static int
nfs_xdr_linkargs(struct rpc_rqst *req, u32 *p, struct nfs_linkargs *args)
{
	p = xdr_encode_fhandle(p, args->fromfh);
	p = xdr_encode_fhandle(p, args->tofh);
	p = xdr_encode_array(p, args->toname, args->tolen);
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

/*
 * Encode SYMLINK arguments
 */
static int
nfs_xdr_symlinkargs(struct rpc_rqst *req, u32 *p, struct nfs_symlinkargs *args)
{
	p = xdr_encode_fhandle(p, args->fromfh);
	p = xdr_encode_array(p, args->fromname, args->fromlen);
	p = xdr_encode_array(p, args->topath, args->tolen);
	p = xdr_encode_sattr(p, args->sattr);
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

/*
 * Encode arguments to readdir call
 */
static int
nfs_xdr_readdirargs(struct rpc_rqst *req, u32 *p, struct nfs_readdirargs *args)
{
	struct rpc_task	*task = req->rq_task;
	struct rpc_auth	*auth = task->tk_auth;
	unsigned int replen;
	u32 count = args->count;

	p = xdr_encode_fhandle(p, args->fh);
	*p++ = htonl(args->cookie);
	*p++ = htonl(count); /* see above */
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);

	/* Inline the page array */
	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readdirres_sz) << 2;
	xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0, count);
	return 0;
}

/*
 * Decode the result of a readdir call.
 * We're not really decoding anymore, we just leave the buffer untouched
 * and only check that it is syntactically correct.
 * The real decoding happens in nfs_decode_entry below, called directly
 * from nfs_readdir for each entry.
 */
static int
nfs_xdr_readdirres(struct rpc_rqst *req, u32 *p, void *dummy)
{
	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
	struct kvec *iov = rcvbuf->head;
	struct page **page;
	int hdrlen, recvd;
	int status, nr;
	unsigned int len, pglen;
	u32 *end, *entry, *kaddr;

	if ((status = ntohl(*p++)))
		return -nfs_stat_to_errno(status);

	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
	if (iov->iov_len < hdrlen) {
		printk(KERN_WARNING "NFS: READDIR reply header overflowed:"
				"length %d > %Zu\n", hdrlen, iov->iov_len);
		return -errno_NFSERR_IO;
	} else if (iov->iov_len != hdrlen) {
		dprintk("NFS: READDIR header is short. iovec will be shifted.\n");
		xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
	}

	pglen = rcvbuf->page_len;
	recvd = rcvbuf->len - hdrlen;
	if (pglen > recvd)
		pglen = recvd;
	page = rcvbuf->pages;
	kaddr = p = (u32 *)kmap_atomic(*page, KM_USER0);
	end = (u32 *)((char *)p + pglen);
	entry = p;
	for (nr = 0; *p++; nr++) {
		if (p + 2 > end)
			goto short_pkt;
		p++; /* fileid */
		len = ntohl(*p++);
		p += XDR_QUADLEN(len) + 1;	/* name plus cookie */
		if (len > NFS2_MAXNAMLEN) {
			printk(KERN_WARNING "NFS: giant filename in readdir (len 0x%x)!\n",
						len);
			goto err_unmap;
		}
		if (p + 2 > end)
			goto short_pkt;
		entry = p;
	}
	if (!nr && (entry[0] != 0 || entry[1] == 0))
		goto short_pkt;
 out:
	kunmap_atomic(kaddr, KM_USER0);
	return nr;
 short_pkt:
	entry[0] = entry[1] = 0;
	/* truncate listing ? */
	if (!nr) {
		printk(KERN_NOTICE "NFS: readdir reply truncated!\n");
		entry[1] = 1;
	}
	goto out;
err_unmap:
	nr = -errno_NFSERR_IO;
	goto out;
}

u32 *
nfs_decode_dirent(u32 *p, struct nfs_entry *entry, int plus)
{
	if (!*p++) {
		if (!*p)
			return ERR_PTR(-EAGAIN);
		entry->eof = 1;
		return ERR_PTR(-EBADCOOKIE);
	}

	entry->ino	  = ntohl(*p++);
	entry->len	  = ntohl(*p++);
	entry->name	  = (const char *) p;
	p		 += XDR_QUADLEN(entry->len);
	entry->prev_cookie	  = entry->cookie;
	entry->cookie	  = ntohl(*p++);
	entry->eof	  = !p[0] && p[1];

	return p;
}

/*
 * NFS XDR decode functions
 */
/*
 * Decode simple status reply
 */
static int
nfs_xdr_stat(struct rpc_rqst *req, u32 *p, void *dummy)
{
	int	status;

	if ((status = ntohl(*p++)) != 0)
		status = -nfs_stat_to_errno(status);
	return status;
}

/*
 * Decode attrstat reply
 * GETATTR, SETATTR, WRITE
 */
static int
nfs_xdr_attrstat(struct rpc_rqst *req, u32 *p, struct nfs_fattr *fattr)
{
	int	status;

	if ((status = ntohl(*p++)))
		return -nfs_stat_to_errno(status);
	xdr_decode_fattr(p, fattr);
	return 0;
}

/*
 * Decode diropres reply
 * LOOKUP, CREATE, MKDIR
 */
static int
nfs_xdr_diropres(struct rpc_rqst *req, u32 *p, struct nfs_diropok *res)
{
	int	status;

	if ((status = ntohl(*p++)))
		return -nfs_stat_to_errno(status);
	p = xdr_decode_fhandle(p, res->fh);
	xdr_decode_fattr(p, res->fattr);
	return 0;
}

/*
 * Encode READLINK args
 */
static int
nfs_xdr_readlinkargs(struct rpc_rqst *req, u32 *p, struct nfs_readlinkargs *args)
{
	struct rpc_auth *auth = req->rq_task->tk_auth;
	unsigned int replen;

	p = xdr_encode_fhandle(p, args->fh);
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);

	/* Inline the page array */
	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readlinkres_sz) << 2;
	xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, args->pgbase, args->pglen);
	return 0;
}

/*
 * Decode READLINK reply
 */
static int
nfs_xdr_readlinkres(struct rpc_rqst *req, u32 *p, void *dummy)
{
	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
	struct kvec *iov = rcvbuf->head;
	int hdrlen, len, recvd;
	char	*kaddr;
	int	status;

	if ((status = ntohl(*p++)))
		return -nfs_stat_to_errno(status);
	/* Convert length of symlink */
	len = ntohl(*p++);
	if (len >= rcvbuf->page_len || len <= 0) {
		dprintk(KERN_WARNING "nfs: server returned giant symlink!\n");
		return -ENAMETOOLONG;
	}
	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
	if (iov->iov_len < hdrlen) {
		printk(KERN_WARNING "NFS: READLINK reply header overflowed:"
				"length %d > %Zu\n", hdrlen, iov->iov_len);
		return -errno_NFSERR_IO;
	} else if (iov->iov_len != hdrlen) {
		dprintk("NFS: READLINK header is short. iovec will be shifted.\n");
		xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
	}
	recvd = req->rq_rcv_buf.len - hdrlen;
	if (recvd < len) {
		printk(KERN_WARNING "NFS: server cheating in readlink reply: "
				"count %u > recvd %u\n", len, recvd);
		return -EIO;
	}

	/* NULL terminate the string we got */
	kaddr = (char *)kmap_atomic(rcvbuf->pages[0], KM_USER0);
	kaddr[len+rcvbuf->page_base] = '\0';
	kunmap_atomic(kaddr, KM_USER0);
	return 0;
}

/*
 * Decode WRITE reply
 */
static int
nfs_xdr_writeres(struct rpc_rqst *req, u32 *p, struct nfs_writeres *res)
{
	res->verf->committed = NFS_FILE_SYNC;
	return nfs_xdr_attrstat(req, p, res->fattr);
}

/*
 * Decode STATFS reply
 */
static int
nfs_xdr_statfsres(struct rpc_rqst *req, u32 *p, struct nfs2_fsstat *res)
{
	int	status;

	if ((status = ntohl(*p++)))
		return -nfs_stat_to_errno(status);

	res->tsize  = ntohl(*p++);
	res->bsize  = ntohl(*p++);
	res->blocks = ntohl(*p++);
	res->bfree  = ntohl(*p++);
	res->bavail = ntohl(*p++);
	return 0;
}

/*
 * We need to translate between nfs status return values and
 * the local errno values which may not be the same.
 */
static struct {
	int stat;
	int errno;
} nfs_errtbl[] = {
	{ NFS_OK,		0		},
	{ NFSERR_PERM,		EPERM		},
	{ NFSERR_NOENT,		ENOENT		},
	{ NFSERR_IO,		errno_NFSERR_IO	},
	{ NFSERR_NXIO,		ENXIO		},
/*	{ NFSERR_EAGAIN,	EAGAIN		}, */
	{ NFSERR_ACCES,		EACCES		},
	{ NFSERR_EXIST,		EEXIST		},
	{ NFSERR_XDEV,		EXDEV		},
	{ 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	},
	{ NFSERR_DQUOT,		EDQUOT		},
	{ NFSERR_STALE,		ESTALE		},
	{ NFSERR_REMOTE,	EREMOTE		},
#ifdef EWFLUSH
	{ NFSERR_WFLUSH,	EWFLUSH		},
#endif
	{ NFSERR_BADHANDLE,	EBADHANDLE	},
	{ NFSERR_NOT_SYNC,	ENOTSYNC	},
	{ NFSERR_BAD_COOKIE,	EBADCOOKIE	},
	{ NFSERR_NOTSUPP,	ENOTSUPP	},
	{ NFSERR_TOOSMALL,	ETOOSMALL	},
	{ NFSERR_SERVERFAULT,	ESERVERFAULT	},
	{ NFSERR_BADTYPE,	EBADTYPE	},
	{ NFSERR_JUKEBOX,	EJUKEBOX	},
	{ -1,			EIO		}
};

/*
 * Convert an NFS error code to a local one.
 * This one is used jointly by NFSv2 and NFSv3.
 */
int
nfs_stat_to_errno(int stat)
{
	int i;

	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
		if (nfs_errtbl[i].stat == stat)
			return nfs_errtbl[i].errno;
	}
	printk(KERN_ERR "nfs_stat_to_errno: bad nfs status return value: %d\n", stat);
	return nfs_errtbl[i].errno;
}

#ifndef MAX
# define MAX(a, b)	(((a) > (b))? (a) : (b))
#endif

#define PROC(proc, argtype, restype, timer)				\
[NFSPROC_##proc] = {							\
	.p_proc	    =  NFSPROC_##proc,					\
	.p_encode   =  (kxdrproc_t) nfs_xdr_##argtype,			\
	.p_decode   =  (kxdrproc_t) nfs_xdr_##restype,			\
	.p_bufsiz   =  MAX(NFS_##argtype##_sz,NFS_##restype##_sz) << 2,	\
	.p_timer    =  timer,						\
	.p_statidx  =  NFSPROC_##proc,					\
	.p_name     =  #proc,						\
	}
struct rpc_procinfo	nfs_procedures[] = {
    PROC(GETATTR,	fhandle,	attrstat, 1),
    PROC(SETATTR,	sattrargs,	attrstat, 0),
    PROC(LOOKUP,	diropargs,	diropres, 2),
    PROC(READLINK,	readlinkargs,	readlinkres, 3),
    PROC(READ,		readargs,	readres, 3),
    PROC(WRITE,		writeargs,	writeres, 4),
    PROC(CREATE,	createargs,	diropres, 0),
    PROC(REMOVE,	diropargs,	stat, 0),
    PROC(RENAME,	renameargs,	stat, 0),
    PROC(LINK,		linkargs,	stat, 0),
    PROC(SYMLINK,	symlinkargs,	stat, 0),
    PROC(MKDIR,		createargs,	diropres, 0),
    PROC(RMDIR,		diropargs,	stat, 0),
    PROC(READDIR,	readdirargs,	readdirres, 3),
    PROC(STATFS,	fhandle,	statfsres, 0),
};

struct rpc_version		nfs_version2 = {
	.number			= 2,
	.nrprocs		= ARRAY_SIZE(nfs_procedures),
	.procs			= nfs_procedures
};
OpenPOWER on IntegriCloud