forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathnfs4client.c
1380 lines (1186 loc) · 35.3 KB
/
nfs4client.c
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
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
* Written by David Howells ([email protected])
*/
#include <linux/module.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/sunrpc/addr.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/xprt.h>
#include <linux/sunrpc/bc_xprt.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include "internal.h"
#include "callback.h"
#include "delegation.h"
#include "nfs4session.h"
#include "nfs4idmap.h"
#include "pnfs.h"
#include "netns.h"
#include "sysfs.h"
#define NFSDBG_FACILITY NFSDBG_CLIENT
/*
* Get a unique NFSv4.0 callback identifier which will be used
* by the V4.0 callback service to lookup the nfs_client struct
*/
static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
{
int ret = 0;
struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
if (clp->rpc_ops->version != 4 || minorversion != 0)
return ret;
idr_preload(GFP_KERNEL);
spin_lock(&nn->nfs_client_lock);
ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT);
if (ret >= 0)
clp->cl_cb_ident = ret;
spin_unlock(&nn->nfs_client_lock);
idr_preload_end();
return ret < 0 ? ret : 0;
}
#ifdef CONFIG_NFS_V4_1
/*
* Per auth flavor data server rpc clients
*/
struct nfs4_ds_server {
struct list_head list; /* ds_clp->cl_ds_clients */
struct rpc_clnt *rpc_clnt;
};
/**
* nfs4_find_ds_client - Common lookup case for DS I/O
* @ds_clp: pointer to the DS's nfs_client
* @flavor: rpc auth flavour to match
*/
static struct nfs4_ds_server *
nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
{
struct nfs4_ds_server *dss;
rcu_read_lock();
list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) {
if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
continue;
goto out;
}
dss = NULL;
out:
rcu_read_unlock();
return dss;
}
static struct nfs4_ds_server *
nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor,
struct nfs4_ds_server *new)
{
struct nfs4_ds_server *dss;
spin_lock(&ds_clp->cl_lock);
list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) {
if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
continue;
goto out;
}
if (new)
list_add_rcu(&new->list, &ds_clp->cl_ds_clients);
dss = new;
out:
spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
return dss;
}
static struct nfs4_ds_server *
nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
{
struct nfs4_ds_server *dss;
dss = kmalloc(sizeof(*dss), GFP_NOFS);
if (dss == NULL)
return ERR_PTR(-ENOMEM);
dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor);
if (IS_ERR(dss->rpc_clnt)) {
int err = PTR_ERR(dss->rpc_clnt);
kfree (dss);
return ERR_PTR(err);
}
INIT_LIST_HEAD(&dss->list);
return dss;
}
static void
nfs4_free_ds_server(struct nfs4_ds_server *dss)
{
rpc_release_client(dss->rpc_clnt);
kfree(dss);
}
/**
* nfs4_find_or_create_ds_client - Find or create a DS rpc client
* @ds_clp: pointer to the DS's nfs_client
* @inode: pointer to the inode
*
* Find or create a DS rpc client with th MDS server rpc client auth flavor
* in the nfs_client cl_ds_clients list.
*/
struct rpc_clnt *
nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode)
{
struct nfs4_ds_server *dss, *new;
rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor;
dss = nfs4_find_ds_client(ds_clp, flavor);
if (dss != NULL)
goto out;
new = nfs4_alloc_ds_server(ds_clp, flavor);
if (IS_ERR(new))
return ERR_CAST(new);
dss = nfs4_add_ds_client(ds_clp, flavor, new);
if (dss != new)
nfs4_free_ds_server(new);
out:
return dss->rpc_clnt;
}
EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
static void
nfs4_shutdown_ds_clients(struct nfs_client *clp)
{
struct nfs4_ds_server *dss;
while (!list_empty(&clp->cl_ds_clients)) {
dss = list_entry(clp->cl_ds_clients.next,
struct nfs4_ds_server, list);
list_del(&dss->list);
rpc_shutdown_client(dss->rpc_clnt);
kfree (dss);
}
}
static void
nfs4_cleanup_callback(struct nfs_client *clp)
{
struct nfs4_copy_state *cp_state;
while (!list_empty(&clp->pending_cb_stateids)) {
cp_state = list_entry(clp->pending_cb_stateids.next,
struct nfs4_copy_state, copies);
list_del(&cp_state->copies);
kfree(cp_state);
}
}
void nfs41_shutdown_client(struct nfs_client *clp)
{
if (nfs4_has_session(clp)) {
nfs4_cleanup_callback(clp);
nfs4_shutdown_ds_clients(clp);
nfs4_destroy_session(clp->cl_session);
nfs4_destroy_clientid(clp);
}
}
#endif /* CONFIG_NFS_V4_1 */
void nfs40_shutdown_client(struct nfs_client *clp)
{
if (clp->cl_slot_tbl) {
nfs4_shutdown_slot_table(clp->cl_slot_tbl);
kfree(clp->cl_slot_tbl);
}
}
struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
{
char buf[INET6_ADDRSTRLEN + 1];
const char *ip_addr = cl_init->ip_addr;
struct nfs_client *clp = nfs_alloc_client(cl_init);
int err;
if (IS_ERR(clp))
return clp;
err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
if (err)
goto error;
if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
err = -EINVAL;
goto error;
}
spin_lock_init(&clp->cl_lock);
INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
INIT_LIST_HEAD(&clp->cl_ds_clients);
rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
clp->cl_mig_gen = 1;
#if IS_ENABLED(CONFIG_NFS_V4_1)
init_waitqueue_head(&clp->cl_lock_waitq);
#endif
INIT_LIST_HEAD(&clp->pending_cb_stateids);
if (cl_init->minorversion != 0)
__set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
__set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
__set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
if (test_bit(NFS_CS_DS, &cl_init->init_flags))
__set_bit(NFS_CS_DS, &clp->cl_flags);
/*
* Set up the connection to the server before we add add to the
* global list.
*/
err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
if (err == -EINVAL)
err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
if (err < 0)
goto error;
/* If no clientaddr= option was specified, find a usable cb address */
if (ip_addr == NULL) {
struct sockaddr_storage cb_addr;
struct sockaddr *sap = (struct sockaddr *)&cb_addr;
err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
if (err < 0)
goto error;
err = rpc_ntop(sap, buf, sizeof(buf));
if (err < 0)
goto error;
ip_addr = (const char *)buf;
}
strscpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
err = nfs_idmap_new(clp);
if (err < 0) {
dprintk("%s: failed to create idmapper. Error = %d\n",
__func__, err);
goto error;
}
__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
return clp;
error:
nfs_free_client(clp);
return ERR_PTR(err);
}
/*
* Destroy the NFS4 callback service
*/
static void nfs4_destroy_callback(struct nfs_client *clp)
{
if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
}
static void nfs4_shutdown_client(struct nfs_client *clp)
{
if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
nfs4_kill_renewd(clp);
clp->cl_mvops->shutdown_client(clp);
nfs4_destroy_callback(clp);
if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
nfs_idmap_delete(clp);
rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
kfree(clp->cl_serverowner);
kfree(clp->cl_serverscope);
kfree(clp->cl_implid);
kfree(clp->cl_owner_id);
}
void nfs4_free_client(struct nfs_client *clp)
{
nfs4_shutdown_client(clp);
nfs_free_client(clp);
}
/*
* Initialize the NFS4 callback service
*/
static int nfs4_init_callback(struct nfs_client *clp)
{
struct rpc_xprt *xprt;
int error;
xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
if (nfs4_has_session(clp)) {
error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
if (error < 0)
return error;
}
error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
if (error < 0) {
dprintk("%s: failed to start callback. Error = %d\n",
__func__, error);
return error;
}
__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
return 0;
}
/**
* nfs40_init_client - nfs_client initialization tasks for NFSv4.0
* @clp: nfs_client to initialize
*
* Returns zero on success, or a negative errno if some error occurred.
*/
int nfs40_init_client(struct nfs_client *clp)
{
struct nfs4_slot_table *tbl;
int ret;
tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
if (tbl == NULL)
return -ENOMEM;
ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
"NFSv4.0 transport Slot table");
if (ret) {
nfs4_shutdown_slot_table(tbl);
kfree(tbl);
return ret;
}
clp->cl_slot_tbl = tbl;
return 0;
}
#if defined(CONFIG_NFS_V4_1)
/**
* nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
* @clp: nfs_client to initialize
*
* Returns zero on success, or a negative errno if some error occurred.
*/
int nfs41_init_client(struct nfs_client *clp)
{
struct nfs4_session *session = NULL;
/*
* Create the session and mark it expired.
* When a SEQUENCE operation encounters the expired session
* it will do session recovery to initialize it.
*/
session = nfs4_alloc_session(clp);
if (!session)
return -ENOMEM;
clp->cl_session = session;
/*
* The create session reply races with the server back
* channel probe. Mark the client NFS_CS_SESSION_INITING
* so that the client back channel can find the
* nfs_client struct
*/
nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
return 0;
}
#endif /* CONFIG_NFS_V4_1 */
/*
* Initialize the minor version specific parts of an NFS4 client record
*/
static int nfs4_init_client_minor_version(struct nfs_client *clp)
{
int ret;
ret = clp->cl_mvops->init_client(clp);
if (ret)
return ret;
return nfs4_init_callback(clp);
}
static void nfs4_add_trunk(struct nfs_client *clp, struct nfs_client *old)
{
struct sockaddr_storage clp_addr, old_addr;
struct sockaddr *clp_sap = (struct sockaddr *)&clp_addr;
struct sockaddr *old_sap = (struct sockaddr *)&old_addr;
size_t clp_salen;
struct xprt_create xprt_args = {
.ident = old->cl_proto,
.net = old->cl_net,
.servername = old->cl_hostname,
};
if (clp->cl_proto != old->cl_proto)
return;
clp_salen = rpc_peeraddr(clp->cl_rpcclient, clp_sap, sizeof(clp_addr));
rpc_peeraddr(old->cl_rpcclient, old_sap, sizeof(old_addr));
if (clp_addr.ss_family != old_addr.ss_family)
return;
xprt_args.dstaddr = clp_sap;
xprt_args.addrlen = clp_salen;
rpc_clnt_add_xprt(old->cl_rpcclient, &xprt_args,
rpc_clnt_test_and_add_xprt, NULL);
}
/**
* nfs4_init_client - Initialise an NFS4 client record
*
* @clp: nfs_client to initialise
* @cl_init: pointer to nfs_client_initdata
*
* Returns pointer to an NFS client, or an ERR_PTR value.
*/
struct nfs_client *nfs4_init_client(struct nfs_client *clp,
const struct nfs_client_initdata *cl_init)
{
struct nfs_client *old;
int error;
if (clp->cl_cons_state == NFS_CS_READY)
/* the client is initialised already */
return clp;
error = nfs4_init_client_minor_version(clp);
if (error < 0)
goto error;
error = nfs4_discover_server_trunking(clp, &old);
if (error < 0)
goto error;
if (clp != old) {
clp->cl_preserve_clid = true;
/*
* Mark the client as having failed initialization so other
* processes walking the nfs_client_list in nfs_match_client()
* won't try to use it.
*/
nfs_mark_client_ready(clp, -EPERM);
if (old->cl_mvops->session_trunk)
nfs4_add_trunk(clp, old);
}
clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags);
nfs_put_client(clp);
return old;
error:
nfs_mark_client_ready(clp, error);
nfs_put_client(clp);
return ERR_PTR(error);
}
/*
* SETCLIENTID just did a callback update with the callback ident in
* "drop," but server trunking discovery claims "drop" and "keep" are
* actually the same server. Swap the callback IDs so that "keep"
* will continue to use the callback ident the server now knows about,
* and so that "keep"'s original callback ident is destroyed when
* "drop" is freed.
*/
static void nfs4_swap_callback_idents(struct nfs_client *keep,
struct nfs_client *drop)
{
struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
unsigned int save = keep->cl_cb_ident;
if (keep->cl_cb_ident == drop->cl_cb_ident)
return;
dprintk("%s: keeping callback ident %u and dropping ident %u\n",
__func__, keep->cl_cb_ident, drop->cl_cb_ident);
spin_lock(&nn->nfs_client_lock);
idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
keep->cl_cb_ident = drop->cl_cb_ident;
idr_replace(&nn->cb_ident_idr, drop, save);
drop->cl_cb_ident = save;
spin_unlock(&nn->nfs_client_lock);
}
static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
const struct nfs_client *clp2)
{
if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
return true;
return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
}
static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
{
return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
}
static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new,
struct nfs_client **prev, struct nfs_net *nn)
{
int status;
if (pos->rpc_ops != new->rpc_ops)
return 1;
if (pos->cl_minorversion != new->cl_minorversion)
return 1;
/* If "pos" isn't marked ready, we can't trust the
* remaining fields in "pos", especially the client
* ID and serverowner fields. Wait for CREATE_SESSION
* to finish. */
if (pos->cl_cons_state > NFS_CS_READY) {
refcount_inc(&pos->cl_count);
spin_unlock(&nn->nfs_client_lock);
nfs_put_client(*prev);
*prev = pos;
status = nfs_wait_client_init_complete(pos);
spin_lock(&nn->nfs_client_lock);
if (status < 0)
return status;
}
if (pos->cl_cons_state != NFS_CS_READY)
return 1;
if (pos->cl_clientid != new->cl_clientid)
return 1;
/* NFSv4.1 always uses the uniform string, however someone
* might switch the uniquifier string on us.
*/
if (!nfs4_match_client_owner_id(pos, new))
return 1;
return 0;
}
/**
* nfs40_walk_client_list - Find server that recognizes a client ID
*
* @new: nfs_client with client ID to test
* @result: OUT: found nfs_client, or new
* @cred: credential to use for trunking test
*
* Returns zero, a negative errno, or a negative NFS4ERR status.
* If zero is returned, an nfs_client pointer is planted in "result."
*
* NB: nfs40_walk_client_list() relies on the new nfs_client being
* the last nfs_client on the list.
*/
int nfs40_walk_client_list(struct nfs_client *new,
struct nfs_client **result,
const struct cred *cred)
{
struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
struct nfs_client *pos, *prev = NULL;
struct nfs4_setclientid_res clid = {
.clientid = new->cl_clientid,
.confirm = new->cl_confirm,
};
int status = -NFS4ERR_STALE_CLIENTID;
spin_lock(&nn->nfs_client_lock);
list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
if (pos == new)
goto found;
status = nfs4_match_client(pos, new, &prev, nn);
if (status < 0)
goto out_unlock;
if (status != 0)
continue;
/*
* We just sent a new SETCLIENTID, which should have
* caused the server to return a new cl_confirm. So if
* cl_confirm is the same, then this is a different
* server that just returned the same cl_confirm by
* coincidence:
*/
if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm,
&new->cl_confirm))
continue;
/*
* But if the cl_confirm's are different, then the only
* way that a SETCLIENTID_CONFIRM to pos can succeed is
* if new and pos point to the same server:
*/
found:
refcount_inc(&pos->cl_count);
spin_unlock(&nn->nfs_client_lock);
nfs_put_client(prev);
prev = pos;
status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
switch (status) {
case -NFS4ERR_STALE_CLIENTID:
break;
case 0:
nfs4_swap_callback_idents(pos, new);
pos->cl_confirm = new->cl_confirm;
nfs_mark_client_ready(pos, NFS_CS_READY);
prev = NULL;
*result = pos;
goto out;
case -ERESTARTSYS:
case -ETIMEDOUT:
/* The callback path may have been inadvertently
* changed. Schedule recovery!
*/
nfs4_schedule_path_down_recovery(pos);
goto out;
default:
goto out;
}
spin_lock(&nn->nfs_client_lock);
}
out_unlock:
spin_unlock(&nn->nfs_client_lock);
/* No match found. The server lost our clientid */
out:
nfs_put_client(prev);
return status;
}
#ifdef CONFIG_NFS_V4_1
/*
* Returns true if the server major ids match
*/
bool
nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
struct nfs41_server_owner *o2)
{
if (o1->major_id_sz != o2->major_id_sz)
return false;
return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0;
}
/*
* Returns true if the server scopes match
*/
static bool
nfs4_check_server_scope(struct nfs41_server_scope *s1,
struct nfs41_server_scope *s2)
{
if (s1->server_scope_sz != s2->server_scope_sz)
return false;
return memcmp(s1->server_scope, s2->server_scope,
s1->server_scope_sz) == 0;
}
/**
* nfs4_detect_session_trunking - Checks for session trunking.
* @clp: original mount nfs_client
* @res: result structure from an exchange_id using the original mount
* nfs_client with a new multi_addr transport
* @xprt: pointer to the transport to add.
*
* Called after a successful EXCHANGE_ID on a multi-addr connection.
* Upon success, add the transport.
*
* Returns zero on success, otherwise -EINVAL
*
* Note: since the exchange_id for the new multi_addr transport uses the
* same nfs_client from the original mount, the cl_owner_id is reused,
* so eir_clientowner is the same.
*/
int nfs4_detect_session_trunking(struct nfs_client *clp,
struct nfs41_exchange_id_res *res,
struct rpc_xprt *xprt)
{
/* Check eir_clientid */
if (clp->cl_clientid != res->clientid)
goto out_err;
/* Check eir_server_owner so_major_id */
if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
res->server_owner))
goto out_err;
/* Check eir_server_owner so_minor_id */
if (clp->cl_serverowner->minor_id != res->server_owner->minor_id)
goto out_err;
/* Check eir_server_scope */
if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
goto out_err;
pr_info("NFS: %s: Session trunking succeeded for %s\n",
clp->cl_hostname,
xprt->address_strings[RPC_DISPLAY_ADDR]);
return 0;
out_err:
pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname,
xprt->address_strings[RPC_DISPLAY_ADDR]);
return -EINVAL;
}
/**
* nfs41_walk_client_list - Find nfs_client that matches a client/server owner
*
* @new: nfs_client with client ID to test
* @result: OUT: found nfs_client, or new
* @cred: credential to use for trunking test
*
* Returns zero, a negative errno, or a negative NFS4ERR status.
* If zero is returned, an nfs_client pointer is planted in "result."
*
* NB: nfs41_walk_client_list() relies on the new nfs_client being
* the last nfs_client on the list.
*/
int nfs41_walk_client_list(struct nfs_client *new,
struct nfs_client **result,
const struct cred *cred)
{
struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
struct nfs_client *pos, *prev = NULL;
int status = -NFS4ERR_STALE_CLIENTID;
spin_lock(&nn->nfs_client_lock);
list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
if (pos == new)
goto found;
status = nfs4_match_client(pos, new, &prev, nn);
if (status < 0)
goto out;
if (status != 0)
continue;
/*
* Note that session trunking is just a special subcase of
* client id trunking. In either case, we want to fall back
* to using the existing nfs_client.
*/
if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
new->cl_serverowner))
continue;
found:
refcount_inc(&pos->cl_count);
*result = pos;
status = 0;
break;
}
out:
spin_unlock(&nn->nfs_client_lock);
nfs_put_client(prev);
return status;
}
#endif /* CONFIG_NFS_V4_1 */
static void nfs4_destroy_server(struct nfs_server *server)
{
LIST_HEAD(freeme);
nfs_server_return_all_delegations(server);
unset_pnfs_layoutdriver(server);
nfs4_purge_state_owners(server, &freeme);
nfs4_free_state_owners(&freeme);
}
/*
* NFSv4.0 callback thread helper
*
* Find a client by callback identifier
*/
struct nfs_client *
nfs4_find_client_ident(struct net *net, int cb_ident)
{
struct nfs_client *clp;
struct nfs_net *nn = net_generic(net, nfs_net_id);
spin_lock(&nn->nfs_client_lock);
clp = idr_find(&nn->cb_ident_idr, cb_ident);
if (clp)
refcount_inc(&clp->cl_count);
spin_unlock(&nn->nfs_client_lock);
return clp;
}
#if defined(CONFIG_NFS_V4_1)
/* Common match routine for v4.0 and v4.1 callback services */
static bool nfs4_cb_match_client(const struct sockaddr *addr,
struct nfs_client *clp, u32 minorversion)
{
struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
/* Don't match clients that failed to initialise */
if (!(clp->cl_cons_state == NFS_CS_READY ||
clp->cl_cons_state == NFS_CS_SESSION_INITING))
return false;
smp_rmb();
/* Match the version and minorversion */
if (clp->rpc_ops->version != 4 ||
clp->cl_minorversion != minorversion)
return false;
/* Match only the IP address, not the port number */
return rpc_cmp_addr(addr, clap);
}
/*
* NFSv4.1 callback thread helper
* For CB_COMPOUND calls, find a client by IP address, protocol version,
* minorversion, and sessionID
*
* Returns NULL if no such client
*/
struct nfs_client *
nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
struct nfs4_sessionid *sid, u32 minorversion)
{
struct nfs_client *clp;
struct nfs_net *nn = net_generic(net, nfs_net_id);
spin_lock(&nn->nfs_client_lock);
list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
if (!nfs4_cb_match_client(addr, clp, minorversion))
continue;
if (!nfs4_has_session(clp))
continue;
/* Match sessionid*/
if (memcmp(clp->cl_session->sess_id.data,
sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
continue;
refcount_inc(&clp->cl_count);
spin_unlock(&nn->nfs_client_lock);
return clp;
}
spin_unlock(&nn->nfs_client_lock);
return NULL;
}
#else /* CONFIG_NFS_V4_1 */
struct nfs_client *
nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
struct nfs4_sessionid *sid, u32 minorversion)
{
return NULL;
}
#endif /* CONFIG_NFS_V4_1 */
/*
* Set up an NFS4 client
*/
static int nfs4_set_client(struct nfs_server *server,
const char *hostname,
const struct sockaddr_storage *addr,
const size_t addrlen,
const char *ip_addr,
int proto, const struct rpc_timeout *timeparms,
u32 minorversion, unsigned int nconnect,
unsigned int max_connect,
struct net *net,
struct xprtsec_parms *xprtsec)
{
struct nfs_client_initdata cl_init = {
.hostname = hostname,
.addr = addr,
.addrlen = addrlen,
.ip_addr = ip_addr,
.nfs_mod = &nfs_v4,
.proto = proto,
.minorversion = minorversion,
.net = net,
.timeparms = timeparms,
.cred = server->cred,
.xprtsec = *xprtsec,
};
struct nfs_client *clp;
if (minorversion == 0)
__set_bit(NFS_CS_REUSEPORT, &cl_init.init_flags);
else
cl_init.max_connect = max_connect;
switch (proto) {
case XPRT_TRANSPORT_TCP:
case XPRT_TRANSPORT_TCP_TLS:
cl_init.nconnect = nconnect;
}
if (server->flags & NFS_MOUNT_NORESVPORT)
__set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
if (server->options & NFS_OPTION_MIGRATION)
__set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status))
__set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags);
server->port = rpc_get_port((struct sockaddr *)addr);
/* Allocate or find a client reference we can use */
clp = nfs_get_client(&cl_init);
if (IS_ERR(clp))
return PTR_ERR(clp);
if (server->nfs_client == clp) {
nfs_put_client(clp);
return -ELOOP;
}
/*
* Query for the lease time on clientid setup or renewal
*
* Note that this will be set on nfs_clients that were created
* only for the DS role and did not set this bit, but now will
* serve a dual role.
*/
set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
server->nfs_client = clp;
nfs_sysfs_add_server(server);
nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state");
return 0;
}
/*
* Set up a pNFS Data Server client.
*
* Return any existing nfs_client that matches server address,port,version
* and minorversion.
*
* For a new nfs_client, use a soft mount (default), a low retrans and a
* low timeout interval so that if a connection is lost, we retry through
* the MDS.
*/
struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
const struct sockaddr_storage *ds_addr, int ds_addrlen,
int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
u32 minor_version)
{
struct rpc_timeout ds_timeout;
struct nfs_client *mds_clp = mds_srv->nfs_client;
struct nfs_client_initdata cl_init = {
.addr = ds_addr,
.addrlen = ds_addrlen,
.nodename = mds_clp->cl_rpcclient->cl_nodename,
.ip_addr = mds_clp->cl_ipaddr,
.nfs_mod = &nfs_v4,
.proto = ds_proto,
.minorversion = minor_version,
.net = mds_clp->cl_net,
.timeparms = &ds_timeout,
.cred = mds_srv->cred,
.xprtsec = mds_srv->nfs_client->cl_xprtsec,
};
char buf[INET6_ADDRSTRLEN + 1];
if (rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf)) <= 0)
return ERR_PTR(-EINVAL);
cl_init.hostname = buf;
switch (ds_proto) {