summaryrefslogtreecommitdiffstats
path: root/fs/nfs/callback_proc.c
blob: a50d7813e3ea8dd03dd7c5e02b36574be815ad8b (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
// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/nfs/callback_proc.c
 *
 * Copyright (C) 2004 Trond Myklebust
 *
 * NFSv4 callback procedures
 */
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/slab.h>
#include <linux/rcupdate.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "internal.h"
#include "pnfs.h"
#include "nfs4session.h"
#include "nfs4trace.h"

#define NFSDBG_FACILITY NFSDBG_CALLBACK

__be32 nfs4_callback_getattr(void *argp, void *resp,
			     struct cb_process_state *cps)
{
	struct cb_getattrargs *args = argp;
	struct cb_getattrres *res = resp;
	struct nfs_delegation *delegation;
	struct nfs_inode *nfsi;
	struct inode *inode;

	res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
		goto out;

	res->bitmap[0] = res->bitmap[1] = 0;
	res->status = htonl(NFS4ERR_BADHANDLE);

	dprintk_rcu("NFS: GETATTR callback request from %s\n",
		rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	inode = nfs_delegation_find_inode(cps->clp, &args->fh);
	if (inode == NULL) {
		trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
				-ntohl(res->status));
		goto out;
	}
	nfsi = NFS_I(inode);
	rcu_read_lock();
	delegation = rcu_dereference(nfsi->delegation);
	if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
		goto out_iput;
	res->size = i_size_read(inode);
	res->change_attr = delegation->change_attr;
	if (nfs_have_writebacks(inode))
		res->change_attr++;
	res->ctime = inode->i_ctime;
	res->mtime = inode->i_mtime;
	res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
		args->bitmap[0];
	res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
		args->bitmap[1];
	res->status = 0;
out_iput:
	rcu_read_unlock();
	trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
	iput(inode);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
	return res->status;
}

__be32 nfs4_callback_recall(void *argp, void *resp,
			    struct cb_process_state *cps)
{
	struct cb_recallargs *args = argp;
	struct inode *inode;
	__be32 res;
	
	res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
		goto out;

	dprintk_rcu("NFS: RECALL callback request from %s\n",
		rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	res = htonl(NFS4ERR_BADHANDLE);
	inode = nfs_delegation_find_inode(cps->clp, &args->fh);
	if (inode == NULL) {
		trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
				&args->stateid, -ntohl(res));
		goto out;
	}
	/* Set up a helper thread to actually return the delegation */
	switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
	case 0:
		res = 0;
		break;
	case -ENOENT:
		res = htonl(NFS4ERR_BAD_STATEID);
		break;
	default:
		res = htonl(NFS4ERR_RESOURCE);
	}
	trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
			&args->stateid, -ntohl(res));
	iput(inode);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
	return res;
}

#if defined(CONFIG_NFS_V4_1)

/*
 * Lookup a layout inode by stateid
 *
 * Note: returns a refcount on the inode and superblock
 */
static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
		const nfs4_stateid *stateid)
{
	struct nfs_server *server;
	struct inode *inode;
	struct pnfs_layout_hdr *lo;

restart:
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
		list_for_each_entry(lo, &server->layouts, plh_layouts) {
			if (stateid != NULL &&
			    !nfs4_stateid_match_other(stateid, &lo->plh_stateid))
				continue;
			inode = igrab(lo->plh_inode);
			if (!inode)
				continue;
			if (!nfs_sb_active(inode->i_sb)) {
				rcu_read_unlock();
				spin_unlock(&clp->cl_lock);
				iput(inode);
				spin_lock(&clp->cl_lock);
				rcu_read_lock();
				goto restart;
			}
			return inode;
		}
	}

	return NULL;
}

/*
 * Lookup a layout inode by filehandle.
 *
 * Note: returns a refcount on the inode and superblock
 *
 */
static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
		const struct nfs_fh *fh)
{
	struct nfs_server *server;
	struct nfs_inode *nfsi;
	struct inode *inode;
	struct pnfs_layout_hdr *lo;

restart:
	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
		list_for_each_entry(lo, &server->layouts, plh_layouts) {
			nfsi = NFS_I(lo->plh_inode);
			if (nfs_compare_fh(fh, &nfsi->fh))
				continue;
			if (nfsi->layout != lo)
				continue;
			inode = igrab(lo->plh_inode);
			if (!inode)
				continue;
			if (!nfs_sb_active(inode->i_sb)) {
				rcu_read_unlock();
				spin_unlock(&clp->cl_lock);
				iput(inode);
				spin_lock(&clp->cl_lock);
				rcu_read_lock();
				goto restart;
			}
			return inode;
		}
	}

	return NULL;
}

static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
		const struct nfs_fh *fh,
		const nfs4_stateid *stateid)
{
	struct inode *inode;

	spin_lock(&clp->cl_lock);
	rcu_read_lock();
	inode = nfs_layout_find_inode_by_stateid(clp, stateid);
	if (!inode)
		inode = nfs_layout_find_inode_by_fh(clp, fh);
	rcu_read_unlock();
	spin_unlock(&clp->cl_lock);

	return inode;
}

/*
 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
 */
static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
					const nfs4_stateid *new)
{
	u32 oldseq, newseq;

	/* Is the stateid still not initialised? */
	if (!pnfs_layout_is_valid(lo))
		return NFS4ERR_DELAY;

	/* Mismatched stateid? */
	if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
		return NFS4ERR_BAD_STATEID;

	newseq = be32_to_cpu(new->seqid);
	/* Are we already in a layout recall situation? */
	if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
	    lo->plh_return_seq != 0) {
		if (newseq < lo->plh_return_seq)
			return NFS4ERR_OLD_STATEID;
		if (newseq > lo->plh_return_seq)
			return NFS4ERR_DELAY;
		goto out;
	}

	/* Check that the stateid matches what we think it should be. */
	oldseq = be32_to_cpu(lo->plh_stateid.seqid);
	if (newseq > oldseq + 1)
		return NFS4ERR_DELAY;
	/* Crazy server! */
	if (newseq <= oldseq)
		return NFS4ERR_OLD_STATEID;
out:
	return NFS_OK;
}

static u32 initiate_file_draining(struct nfs_client *clp,
				  struct cb_layoutrecallargs *args)
{
	struct inode *ino;
	struct pnfs_layout_hdr *lo;
	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
	LIST_HEAD(free_me_list);

	ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
	if (!ino)
		goto out;

	pnfs_layoutcommit_inode(ino, false);


	spin_lock(&ino->i_lock);
	lo = NFS_I(ino)->layout;
	if (!lo) {
		spin_unlock(&ino->i_lock);
		goto out;
	}
	pnfs_get_layout_hdr(lo);
	rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
	if (rv != NFS_OK)
		goto unlock;
	pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);

	/*
	 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
	 */
	if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
		rv = NFS4ERR_DELAY;
		goto unlock;
	}

	if (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
				&args->cbl_range,
				be32_to_cpu(args->cbl_stateid.seqid))) {
		rv = NFS4_OK;
		goto unlock;
	}

	/* Embrace your forgetfulness! */
	rv = NFS4ERR_NOMATCHING_LAYOUT;

	if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
		NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
			&args->cbl_range);
	}
unlock:
	spin_unlock(&ino->i_lock);
	pnfs_free_lseg_list(&free_me_list);
	/* Free all lsegs that are attached to commit buckets */
	nfs_commit_inode(ino, 0);
	pnfs_put_layout_hdr(lo);
out:
	trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
			&args->cbl_stateid, -rv);
	nfs_iput_and_deactive(ino);
	return rv;
}

static u32 initiate_bulk_draining(struct nfs_client *clp,
				  struct cb_layoutrecallargs *args)
{
	int stat;

	if (args->cbl_recall_type == RETURN_FSID)
		stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
	else
		stat = pnfs_destroy_layouts_byclid(clp, true);
	if (stat != 0)
		return NFS4ERR_DELAY;
	return NFS4ERR_NOMATCHING_LAYOUT;
}

static u32 do_callback_layoutrecall(struct nfs_client *clp,
				    struct cb_layoutrecallargs *args)
{
	if (args->cbl_recall_type == RETURN_FILE)
		return initiate_file_draining(clp, args);
	return initiate_bulk_draining(clp, args);
}

__be32 nfs4_callback_layoutrecall(void *argp, void *resp,
				  struct cb_process_state *cps)
{
	struct cb_layoutrecallargs *args = argp;
	u32 res = NFS4ERR_OP_NOT_IN_SESSION;

	if (cps->clp)
		res = do_callback_layoutrecall(cps->clp, args);
	return cpu_to_be32(res);
}

static void pnfs_recall_all_layouts(struct nfs_client *clp)
{
	struct cb_layoutrecallargs args;

	/* Pretend we got a CB_LAYOUTRECALL(ALL) */
	memset(&args, 0, sizeof(args));
	args.cbl_recall_type = RETURN_ALL;
	/* FIXME we ignore errors, what should we do? */
	do_callback_layoutrecall(clp, &args);
}

__be32 nfs4_callback_devicenotify(void *argp, void *resp,
				  struct cb_process_state *cps)
{
	struct cb_devicenotifyargs *args = argp;
	int i;
	__be32 res = 0;
	struct nfs_client *clp = cps->clp;
	struct nfs_server *server = NULL;

	if (!clp) {
		res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
		goto out;
	}

	for (i = 0; i < args->ndevs; i++) {
		struct cb_devicenotifyitem *dev = &args->devs[i];

		if (!server ||
		    server->pnfs_curr_ld->id != dev->cbd_layout_type) {
			rcu_read_lock();
			list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
				if (server->pnfs_curr_ld &&
				    server->pnfs_curr_ld->id == dev->cbd_layout_type) {
					rcu_read_unlock();
					goto found;
				}
			rcu_read_unlock();
			continue;
		}

	found:
		nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
	}

out:
	kfree(args->devs);
	return res;
}

/*
 * Validate the sequenceID sent by the server.
 * Return success if the sequenceID is one more than what we last saw on
 * this slot, accounting for wraparound.  Increments the slot's sequence.
 *
 * We don't yet implement a duplicate request cache, instead we set the
 * back channel ca_maxresponsesize_cached to zero. This is OK for now
 * since we only currently implement idempotent callbacks anyway.
 *
 * We have a single slot backchannel at this time, so we don't bother
 * checking the used_slots bit array on the table.  The lower layer guarantees
 * a single outstanding callback request at a time.
 */
static __be32
validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
		const struct cb_sequenceargs * args)
{
	if (args->csa_slotid > tbl->server_highest_slotid)
		return htonl(NFS4ERR_BADSLOT);

	/* Replay */
	if (args->csa_sequenceid == slot->seq_nr) {
		if (nfs4_test_locked_slot(tbl, slot->slot_nr))
			return htonl(NFS4ERR_DELAY);
		/* Signal process_op to set this error on next op */
		if (args->csa_cachethis == 0)
			return htonl(NFS4ERR_RETRY_UNCACHED_REP);

		/* Liar! We never allowed you to set csa_cachethis != 0 */
		return htonl(NFS4ERR_SEQ_FALSE_RETRY);
	}

	/* Wraparound */
	if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) {
		if (args->csa_sequenceid == 1)
			return htonl(NFS4_OK);
	} else if (likely(args->csa_sequenceid == slot->seq_nr + 1))
		return htonl(NFS4_OK);

	/* Misordered request */
	return htonl(NFS4ERR_SEQ_MISORDERED);
}

/*
 * For each referring call triple, check the session's slot table for
 * a match.  If the slot is in use and the sequence numbers match, the
 * client is still waiting for a response to the original request.
 */
static bool referring_call_exists(struct nfs_client *clp,
				  uint32_t nrclists,
				  struct referring_call_list *rclists)
{
	bool status = false;
	int i, j;
	struct nfs4_session *session;
	struct nfs4_slot_table *tbl;
	struct referring_call_list *rclist;
	struct referring_call *ref;

	/*
	 * XXX When client trunking is implemented, this becomes
	 * a session lookup from within the loop
	 */
	session = clp->cl_session;
	tbl = &session->fc_slot_table;

	for (i = 0; i < nrclists; i++) {
		rclist = &rclists[i];
		if (memcmp(session->sess_id.data,
			   rclist->rcl_sessionid.data,
			   NFS4_MAX_SESSIONID_LEN) != 0)
			continue;

		for (j = 0; j < rclist->rcl_nrefcalls; j++) {
			ref = &rclist->rcl_refcalls[j];
			status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
					ref->rc_sequenceid, HZ >> 1) < 0;
			if (status)
				goto out;
		}
	}

out:
	return status;
}

__be32 nfs4_callback_sequence(void *argp, void *resp,
			      struct cb_process_state *cps)
{
	struct cb_sequenceargs *args = argp;
	struct cb_sequenceres *res = resp;
	struct nfs4_slot_table *tbl;
	struct nfs4_slot *slot;
	struct nfs_client *clp;
	int i;
	__be32 status = htonl(NFS4ERR_BADSESSION);

	clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
					 &args->csa_sessionid, cps->minorversion);
	if (clp == NULL)
		goto out;

	if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
		goto out;

	tbl = &clp->cl_session->bc_slot_table;

	/* Set up res before grabbing the spinlock */
	memcpy(&res->csr_sessionid, &args->csa_sessionid,
	       sizeof(res->csr_sessionid));
	res->csr_sequenceid = args->csa_sequenceid;
	res->csr_slotid = args->csa_slotid;

	spin_lock(&tbl->slot_tbl_lock);
	/* state manager is resetting the session */
	if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
		status = htonl(NFS4ERR_DELAY);
		/* Return NFS4ERR_BADSESSION if we're draining the session
		 * in order to reset it.
		 */
		if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
			status = htonl(NFS4ERR_BADSESSION);
		goto out_unlock;
	}

	status = htonl(NFS4ERR_BADSLOT);
	slot = nfs4_lookup_slot(tbl, args->csa_slotid);
	if (IS_ERR(slot))
		goto out_unlock;

	res->csr_highestslotid = tbl->server_highest_slotid;
	res->csr_target_highestslotid = tbl->target_highest_slotid;

	status = validate_seqid(tbl, slot, args);
	if (status)
		goto out_unlock;
	if (!nfs4_try_to_lock_slot(tbl, slot)) {
		status = htonl(NFS4ERR_DELAY);
		goto out_unlock;
	}
	cps->slot = slot;

	/* The ca_maxresponsesize_cached is 0 with no DRC */
	if (args->csa_cachethis != 0) {
		status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
		goto out_unlock;
	}

	/*
	 * Check for pending referring calls.  If a match is found, a
	 * related callback was received before the response to the original
	 * call.
	 */
	if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
		status = htonl(NFS4ERR_DELAY);
		goto out_unlock;
	}

	/*
	 * RFC5661 20.9.3
	 * If CB_SEQUENCE returns an error, then the state of the slot
	 * (sequence ID, cached reply) MUST NOT change.
	 */
	slot->seq_nr = args->csa_sequenceid;
out_unlock:
	spin_unlock(&tbl->slot_tbl_lock);

out:
	cps->clp = clp; /* put in nfs4_callback_compound */
	for (i = 0; i < args->csa_nrclists; i++)
		kfree(args->csa_rclists[i].rcl_refcalls);
	kfree(args->csa_rclists);

	if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
		cps->drc_status = status;
		status = 0;
	} else
		res->csr_status = status;

	trace_nfs4_cb_sequence(args, res, status);
	return status;
}

static bool
validate_bitmap_values(unsigned int mask)
{
	return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
}

__be32 nfs4_callback_recallany(void *argp, void *resp,
			       struct cb_process_state *cps)
{
	struct cb_recallanyargs *args = argp;
	__be32 status;
	fmode_t flags = 0;

	status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* set in cb_sequence */
		goto out;

	dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
		rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	status = cpu_to_be32(NFS4ERR_INVAL);
	if (!validate_bitmap_values(args->craa_type_mask))
		goto out;

	status = cpu_to_be32(NFS4_OK);
	if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
		flags = FMODE_READ;
	if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
		flags |= FMODE_WRITE;
	if (flags)
		nfs_expire_unused_delegation_types(cps->clp, flags);

	if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
		pnfs_recall_all_layouts(cps->clp);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	return status;
}

/* Reduce the fore channel's max_slots to the target value */
__be32 nfs4_callback_recallslot(void *argp, void *resp,
				struct cb_process_state *cps)
{
	struct cb_recallslotargs *args = argp;
	struct nfs4_slot_table *fc_tbl;
	__be32 status;

	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* set in cb_sequence */
		goto out;

	dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
		rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
		args->crsa_target_highest_slotid);

	fc_tbl = &cps->clp->cl_session->fc_slot_table;

	status = htonl(NFS4_OK);

	nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
	nfs41_notify_server(cps->clp);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	return status;
}

__be32 nfs4_callback_notify_lock(void *argp, void *resp,
				 struct cb_process_state *cps)
{
	struct cb_notify_lock_args *args = argp;

	if (!cps->clp) /* set in cb_sequence */
		return htonl(NFS4ERR_OP_NOT_IN_SESSION);

	dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
		rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	/* Don't wake anybody if the string looked bogus */
	if (args->cbnl_valid)
		__wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);

	return htonl(NFS4_OK);
}
#endif /* CONFIG_NFS_V4_1 */
OpenPOWER on IntegriCloud