aboutsummaryrefslogtreecommitdiff
path: root/fs/nfs/proc.c
blob: 611bec22f552e62b9ab0c63bf660e2e773fe81b0 (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
/*
 *  linux/fs/nfs/proc.c
 *
 *  Copyright (C) 1992, 1993, 1994  Rick Sladkey
 *
 *  OS-independent nfs remote procedure call functions
 *
 *  Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers
 *  so at last we can have decent(ish) throughput off a 
 *  Sun server.
 *
 *  Coding optimized and cleaned up by Florian La Roche.
 *  Note: Error returns are optimized for NFS_OK, which isn't translated via
 *  nfs_stat_to_errno(), but happens to be already the right return code.
 *
 *  Also, the code currently doesn't check the size of the packet, when
 *  it decodes the packet.
 *
 *  Feel free to fix it and mail me the diffs if it worries you.
 *
 *  Completely rewritten to support the new RPC call interface;
 *  rewrote and moved the entire XDR stuff to xdr.c
 *  --Olaf Kirch June 1996
 *
 *  The code below initializes all auto variables explicitly, otherwise
 *  it will fail to work as a module (gcc generates a memset call for an
 *  incomplete struct).
 */

#include <linux/types.h>
#include <linux/param.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/lockd/bind.h>
#include "internal.h"

#define NFSDBG_FACILITY		NFSDBG_PROC

/*
 * wrapper to handle the -EKEYEXPIRED error message. This should generally
 * only happen if using krb5 auth and a user's TGT expires. NFSv2 doesn't
 * support the NFSERR_JUKEBOX error code, but we handle this situation in the
 * same way that we handle that error with NFSv3.
 */
static int
nfs_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
{
	int res;
	do {
		res = rpc_call_sync(clnt, msg, flags);
		if (res != -EKEYEXPIRED)
			break;
		schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
		res = -ERESTARTSYS;
	} while (!fatal_signal_pending(current));
	return res;
}

#define rpc_call_sync(clnt, msg, flags)	nfs_rpc_wrapper(clnt, msg, flags)

static int
nfs_async_handle_expired_key(struct rpc_task *task)
{
	if (task->tk_status != -EKEYEXPIRED)
		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
nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
		  struct nfs_fsinfo *info)
{
	struct nfs_fattr *fattr = info->fattr;
	struct nfs2_fsstat fsinfo;
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_GETATTR],
		.rpc_argp	= fhandle,
		.rpc_resp	= fattr,
	};
	int status;

	dprintk("%s: call getattr\n", __func__);
	nfs_fattr_init(fattr);
	status = rpc_call_sync(server->client, &msg, 0);
	/* Retry with default authentication if different */
	if (status && server->nfs_client->cl_rpcclient != server->client)
		status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
	dprintk("%s: reply getattr: %d\n", __func__, status);
	if (status)
		return status;
	dprintk("%s: call statfs\n", __func__);
	msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
	msg.rpc_resp = &fsinfo;
	status = rpc_call_sync(server->client, &msg, 0);
	/* Retry with default authentication if different */
	if (status && server->nfs_client->cl_rpcclient != server->client)
		status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
	dprintk("%s: reply statfs: %d\n", __func__, status);
	if (status)
		return status;
	info->rtmax  = NFS_MAXDATA;
	info->rtpref = fsinfo.tsize;
	info->rtmult = fsinfo.bsize;
	info->wtmax  = NFS_MAXDATA;
	info->wtpref = fsinfo.tsize;
	info->wtmult = fsinfo.bsize;
	info->dtpref = fsinfo.tsize;
	info->maxfilesize = 0x7FFFFFFF;
	info->lease_time = 0;
	return 0;
}

/*
 * One function for each procedure in the NFS protocol.
 */
static int
nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_fattr *fattr)
{
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_GETATTR],
		.rpc_argp	= fhandle,
		.rpc_resp	= fattr,
	};
	int	status;

	dprintk("NFS call  getattr\n");
	nfs_fattr_init(fattr);
	status = rpc_call_sync(server->client, &msg, 0);
	dprintk("NFS reply getattr: %d\n", status);
	return status;
}

static int
nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
		 struct iattr *sattr)
{
	struct inode *inode = dentry->d_inode;
	struct nfs_sattrargs	arg = { 
		.fh	= NFS_FH(inode),
		.sattr	= sattr
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_SETATTR],
		.rpc_argp	= &arg,
		.rpc_resp	= fattr,
	};
	int	status;

	/* Mask out the non-modebit related stuff from attr->ia_mode */
	sattr->ia_mode &= S_IALLUGO;

	dprintk("NFS call  setattr\n");
	if (sattr->ia_valid & ATTR_FILE)
		msg.rpc_cred = nfs_file_cred(sattr->ia_file);
	nfs_fattr_init(fattr);
	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
	if (status == 0)
		nfs_setattr_update_inode(inode, sattr);
	dprintk("NFS reply setattr: %d\n", status);
	return status;
}

static int
nfs_proc_lookup(struct inode *dir, struct qstr *name,
		struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
	struct nfs_diropargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= name->name,
		.len		= name->len
	};
	struct nfs_diropok	res = {
		.fh		= fhandle,
		.fattr		= fattr
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_LOOKUP],
		.rpc_argp	= &arg,
		.rpc_resp	= &res,
	};
	int			status;

	dprintk("NFS call  lookup %s\n", name->name);
	nfs_fattr_init(fattr);
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	dprintk("NFS reply lookup: %d\n", status);
	return status;
}

static int nfs_proc_readlink(struct inode *inode, struct page *page,
		unsigned int pgbase, unsigned int pglen)
{
	struct nfs_readlinkargs	args = {
		.fh		= NFS_FH(inode),
		.pgbase		= pgbase,
		.pglen		= pglen,
		.pages		= &page
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_READLINK],
		.rpc_argp	= &args,
	};
	int			status;

	dprintk("NFS call  readlink\n");
	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
	dprintk("NFS reply readlink: %d\n", status);
	return status;
}

struct nfs_createdata {
	struct nfs_createargs arg;
	struct nfs_diropok res;
	struct nfs_fh fhandle;
	struct nfs_fattr fattr;
};

static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
		struct dentry *dentry, struct iattr *sattr)
{
	struct nfs_createdata *data;

	data = kmalloc(sizeof(*data), GFP_KERNEL);

	if (data != NULL) {
		data->arg.fh = NFS_FH(dir);
		data->arg.name = dentry->d_name.name;
		data->arg.len = dentry->d_name.len;
		data->arg.sattr = sattr;
		nfs_fattr_init(&data->fattr);
		data->fhandle.size = 0;
		data->res.fh = &data->fhandle;
		data->res.fattr = &data->fattr;
	}
	return data;
};

static void nfs_free_createdata(const struct nfs_createdata *data)
{
	kfree(data);
}

static int
nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
		int flags, struct nameidata *nd)
{
	struct nfs_createdata *data;
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_CREATE],
	};
	int status = -ENOMEM;

	dprintk("NFS call  create %s\n", dentry->d_name.name);
	data = nfs_alloc_createdata(dir, dentry, sattr);
	if (data == NULL)
		goto out;
	msg.rpc_argp = &data->arg;
	msg.rpc_resp = &data->res;
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	nfs_mark_for_revalidate(dir);
	if (status == 0)
		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
	nfs_free_createdata(data);
out:
	dprintk("NFS reply create: %d\n", status);
	return status;
}

/*
 * In NFSv2, mknod is grafted onto the create call.
 */
static int
nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
	       dev_t rdev)
{
	struct nfs_createdata *data;
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_CREATE],
	};
	umode_t mode;
	int status = -ENOMEM;

	dprintk("NFS call  mknod %s\n", dentry->d_name.name);

	mode = sattr->ia_mode;
	if (S_ISFIFO(mode)) {
		sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
		sattr->ia_valid &= ~ATTR_SIZE;
	} else if (S_ISCHR(mode) || S_ISBLK(mode)) {
		sattr->ia_valid |= ATTR_SIZE;
		sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
	}

	data = nfs_alloc_createdata(dir, dentry, sattr);
	if (data == NULL)
		goto out;
	msg.rpc_argp = &data->arg;
	msg.rpc_resp = &data->res;

	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	nfs_mark_for_revalidate(dir);

	if (status == -EINVAL && S_ISFIFO(mode)) {
		sattr->ia_mode = mode;
		nfs_fattr_init(data->res.fattr);
		status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	}
	if (status == 0)
		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
	nfs_free_createdata(data);
out:
	dprintk("NFS reply mknod: %d\n", status);
	return status;
}
  
static int
nfs_proc_remove(struct inode *dir, struct qstr *name)
{
	struct nfs_removeargs arg = {
		.fh = NFS_FH(dir),
		.name.len = name->len,
		.name.name = name->name,
	};
	struct rpc_message msg = { 
		.rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
		.rpc_argp = &arg,
	};
	int			status;

	dprintk("NFS call  remove %s\n", name->name);
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	nfs_mark_for_revalidate(dir);

	dprintk("NFS reply remove: %d\n", status);
	return status;
}

static void
nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
{
	msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
}

static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
{
	if (nfs_async_handle_expired_key(task))
		return 0;
	nfs_mark_for_revalidate(dir);
	return 1;
}

static int
nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
		struct inode *new_dir, struct qstr *new_name)
{
	struct nfs_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 rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_RENAME],
		.rpc_argp	= &arg,
	};
	int			status;

	dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
	status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
	nfs_mark_for_revalidate(old_dir);
	nfs_mark_for_revalidate(new_dir);
	dprintk("NFS reply rename: %d\n", status);
	return status;
}

static int
nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
	struct nfs_linkargs	arg = {
		.fromfh		= NFS_FH(inode),
		.tofh		= NFS_FH(dir),
		.toname		= name->name,
		.tolen		= name->len
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_LINK],
		.rpc_argp	= &arg,
	};
	int			status;

	dprintk("NFS call  link %s\n", name->name);
	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
	nfs_mark_for_revalidate(inode);
	nfs_mark_for_revalidate(dir);
	dprintk("NFS reply link: %d\n", status);
	return status;
}

static int
nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
		 unsigned int len, struct iattr *sattr)
{
	struct nfs_fh *fh;
	struct nfs_fattr *fattr;
	struct nfs_symlinkargs	arg = {
		.fromfh		= NFS_FH(dir),
		.fromname	= dentry->d_name.name,
		.fromlen	= dentry->d_name.len,
		.pages		= &page,
		.pathlen	= len,
		.sattr		= sattr
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_SYMLINK],
		.rpc_argp	= &arg,
	};
	int status = -ENAMETOOLONG;

	dprintk("NFS call  symlink %s\n", dentry->d_name.name);

	if (len > NFS2_MAXPATHLEN)
		goto out;

	fh = nfs_alloc_fhandle();
	fattr = nfs_alloc_fattr();
	status = -ENOMEM;
	if (fh == NULL || fattr == NULL)
		goto out;

	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	nfs_mark_for_revalidate(dir);

	/*
	 * V2 SYMLINK requests don't return any attributes.  Setting the
	 * filehandle size to zero indicates to nfs_instantiate that it
	 * should fill in the data with a LOOKUP call on the wire.
	 */
	if (status == 0)
		status = nfs_instantiate(dentry, fh, fattr);

	nfs_free_fattr(fattr);
	nfs_free_fhandle(fh);
out:
	dprintk("NFS reply symlink: %d\n", status);
	return status;
}

static int
nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
{
	struct nfs_createdata *data;
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_MKDIR],
	};
	int status = -ENOMEM;

	dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
	data = nfs_alloc_createdata(dir, dentry, sattr);
	if (data == NULL)
		goto out;
	msg.rpc_argp = &data->arg;
	msg.rpc_resp = &data->res;

	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	nfs_mark_for_revalidate(dir);
	if (status == 0)
		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
	nfs_free_createdata(data);
out:
	dprintk("NFS reply mkdir: %d\n", status);
	return status;
}

static int
nfs_proc_rmdir(struct inode *dir, struct qstr *name)
{
	struct nfs_diropargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= name->name,
		.len		= name->len
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_RMDIR],
		.rpc_argp	= &arg,
	};
	int			status;

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

/*
 * The READDIR implementation is somewhat hackish - we pass a temporary
 * buffer to the encode function, which installs it in the receive
 * the receive iovec. The decode function just parses the reply to make
 * sure it is syntactically correct; the entries itself are decoded
 * from nfs_readdir by calling the decode_entry function directly.
 */
static int
nfs_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_readdirargs	arg = {
		.fh		= NFS_FH(dir),
		.cookie		= cookie,
		.count		= count,
		.pages		= &page,
	};
	struct rpc_message	msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_READDIR],
		.rpc_argp	= &arg,
		.rpc_cred	= cred,
	};
	int			status;

	dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);

	nfs_invalidate_atime(dir);

	dprintk("NFS reply readdir: %d\n", status);
	return status;
}

static int
nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
			struct nfs_fsstat *stat)
{
	struct nfs2_fsstat fsinfo;
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_STATFS],
		.rpc_argp	= fhandle,
		.rpc_resp	= &fsinfo,
	};
	int	status;

	dprintk("NFS call  statfs\n");
	nfs_fattr_init(stat->fattr);
	status = rpc_call_sync(server->client, &msg, 0);
	dprintk("NFS reply statfs: %d\n", status);
	if (status)
		goto out;
	stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
	stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
	stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
	stat->tfiles = 0;
	stat->ffiles = 0;
	stat->afiles = 0;
out:
	return status;
}

static int
nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
			struct nfs_fsinfo *info)
{
	struct nfs2_fsstat fsinfo;
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_STATFS],
		.rpc_argp	= fhandle,
		.rpc_resp	= &fsinfo,
	};
	int	status;

	dprintk("NFS call  fsinfo\n");
	nfs_fattr_init(info->fattr);
	status = rpc_call_sync(server->client, &msg, 0);
	dprintk("NFS reply fsinfo: %d\n", status);
	if (status)
		goto out;
	info->rtmax  = NFS_MAXDATA;
	info->rtpref = fsinfo.tsize;
	info->rtmult = fsinfo.bsize;
	info->wtmax  = NFS_MAXDATA;
	info->wtpref = fsinfo.tsize;
	info->wtmult = fsinfo.bsize;
	info->dtpref = fsinfo.tsize;
	info->maxfilesize = 0x7FFFFFFF;
	info->lease_time = 0;
out:
	return status;
}

static int
nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
		  struct nfs_pathconf *info)
{
	info->max_link = 0;
	info->max_namelen = NFS2_MAXNAMLEN;
	return 0;
}

static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
{
	if (nfs_async_handle_expired_key(task))
		return -EAGAIN;

	nfs_invalidate_atime(data->inode);
	if (task->tk_status >= 0) {
		nfs_refresh_inode(data->inode, data->res.fattr);
		/* Emulate the eof flag, which isn't normally needed in NFSv2
		 * as it is guaranteed to always return the file attributes
		 */
		if (data->args.offset + data->args.count >= data->res.fattr->size)
			data->res.eof = 1;
	}
	return 0;
}

static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
{
	msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
}

static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
{
	if (nfs_async_handle_expired_key(task))
		return -EAGAIN;

	if (task->tk_status >= 0)
		nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
	return 0;
}

static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
{
	/* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
	data->args.stable = NFS_FILE_SYNC;
	msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
}

static void
nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
{
	BUG();
}

static int
nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
{
	struct inode *inode = filp->f_path.dentry->d_inode;

	return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
}

/* Helper functions for NFS lock bounds checking */
#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
static int nfs_lock_check_bounds(const struct file_lock *fl)
{
	__s32 start, end;

	start = (__s32)fl->fl_start;
	if ((loff_t)start != fl->fl_start)
		goto out_einval;

	if (fl->fl_end != OFFSET_MAX) {
		end = (__s32)fl->fl_end;
		if ((loff_t)end != fl->fl_end)
			goto out_einval;
	} else
		end = NFS_LOCK32_OFFSET_MAX;

	if (start < 0 || start > end)
		goto out_einval;
	return 0;
out_einval:
	return -EINVAL;
}

const struct nfs_rpc_ops nfs_v2_clientops = {
	.version	= 2,		       /* protocol version */
	.dentry_ops	= &nfs_dentry_operations,
	.dir_inode_ops	= &nfs_dir_inode_operations,
	.file_inode_ops	= &nfs_file_inode_operations,
	.getroot	= nfs_proc_get_root,
	.getattr	= nfs_proc_getattr,
	.setattr	= nfs_proc_setattr,
	.lookup		= nfs_proc_lookup,
	.access		= NULL,		       /* access */
	.readlink	= nfs_proc_readlink,
	.create		= nfs_proc_create,
	.remove		= nfs_proc_remove,
	.unlink_setup	= nfs_proc_unlink_setup,
	.unlink_done	= nfs_proc_unlink_done,
	.rename		= nfs_proc_rename,
	.link		= nfs_proc_link,
	.symlink	= nfs_proc_symlink,
	.mkdir		= nfs_proc_mkdir,
	.rmdir		= nfs_proc_rmdir,
	.readdir	= nfs_proc_readdir,
	.mknod		= nfs_proc_mknod,
	.statfs		= nfs_proc_statfs,
	.fsinfo		= nfs_proc_fsinfo,
	.pathconf	= nfs_proc_pathconf,
	.decode_dirent	= nfs_decode_dirent,
	.read_setup	= nfs_proc_read_setup,
	.read_done	= nfs_read_done,
	.write_setup	= nfs_proc_write_setup,
	.write_done	= nfs_write_done,
	.commit_setup	= nfs_proc_commit_setup,
	.lock		= nfs_proc_lock,
	.lock_check_bounds = nfs_lock_check_bounds,
	.close_context	= nfs_close_context,
};