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13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/sched.h>
16#include <linux/time.h>
17#include <linux/kernel.h>
18#include <linux/mm.h>
19#include <linux/string.h>
20#include <linux/stat.h>
21#include <linux/errno.h>
22#include <linux/unistd.h>
23#include <linux/sunrpc/addr.h>
24#include <linux/sunrpc/clnt.h>
25#include <linux/sunrpc/stats.h>
26#include <linux/sunrpc/metrics.h>
27#include <linux/sunrpc/xprtsock.h>
28#include <linux/sunrpc/xprtrdma.h>
29#include <linux/nfs_fs.h>
30#include <linux/nfs_mount.h>
31#include <linux/nfs4_mount.h>
32#include <linux/lockd/bind.h>
33#include <linux/seq_file.h>
34#include <linux/mount.h>
35#include <linux/vfs.h>
36#include <linux/inet.h>
37#include <linux/in6.h>
38#include <linux/slab.h>
39#include <linux/idr.h>
40#include <net/ipv6.h>
41#include <linux/nfs_xdr.h>
42#include <linux/sunrpc/bc_xprt.h>
43#include <linux/nsproxy.h>
44#include <linux/pid_namespace.h>
45
46
47#include "nfs4_fs.h"
48#include "callback.h"
49#include "delegation.h"
50#include "iostat.h"
51#include "internal.h"
52#include "fscache.h"
53#include "pnfs.h"
54#include "nfs.h"
55#include "netns.h"
56#include "sysfs.h"
57#include "nfs42.h"
58
59#define NFSDBG_FACILITY NFSDBG_CLIENT
60
61static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
62static DEFINE_SPINLOCK(nfs_version_lock);
63static DEFINE_MUTEX(nfs_version_mutex);
64static LIST_HEAD(nfs_versions);
65
66
67
68
69static const struct rpc_version *nfs_version[5] = {
70 [2] = NULL,
71 [3] = NULL,
72 [4] = NULL,
73};
74
75const struct rpc_program nfs_program = {
76 .name = "nfs",
77 .number = NFS_PROGRAM,
78 .nrvers = ARRAY_SIZE(nfs_version),
79 .version = nfs_version,
80 .stats = &nfs_rpcstat,
81 .pipe_dir_name = NFS_PIPE_DIRNAME,
82};
83
84struct rpc_stat nfs_rpcstat = {
85 .program = &nfs_program
86};
87
88static struct nfs_subversion *find_nfs_version(unsigned int version)
89{
90 struct nfs_subversion *nfs;
91 spin_lock(&nfs_version_lock);
92
93 list_for_each_entry(nfs, &nfs_versions, list) {
94 if (nfs->rpc_ops->version == version) {
95 spin_unlock(&nfs_version_lock);
96 return nfs;
97 }
98 }
99
100 spin_unlock(&nfs_version_lock);
101 return ERR_PTR(-EPROTONOSUPPORT);
102}
103
104struct nfs_subversion *get_nfs_version(unsigned int version)
105{
106 struct nfs_subversion *nfs = find_nfs_version(version);
107
108 if (IS_ERR(nfs)) {
109 mutex_lock(&nfs_version_mutex);
110 request_module("nfsv%d", version);
111 nfs = find_nfs_version(version);
112 mutex_unlock(&nfs_version_mutex);
113 }
114
115 if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
116 return ERR_PTR(-EAGAIN);
117 return nfs;
118}
119
120void put_nfs_version(struct nfs_subversion *nfs)
121{
122 module_put(nfs->owner);
123}
124
125void register_nfs_version(struct nfs_subversion *nfs)
126{
127 spin_lock(&nfs_version_lock);
128
129 list_add(&nfs->list, &nfs_versions);
130 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
131
132 spin_unlock(&nfs_version_lock);
133}
134EXPORT_SYMBOL_GPL(register_nfs_version);
135
136void unregister_nfs_version(struct nfs_subversion *nfs)
137{
138 spin_lock(&nfs_version_lock);
139
140 nfs_version[nfs->rpc_ops->version] = NULL;
141 list_del(&nfs->list);
142
143 spin_unlock(&nfs_version_lock);
144}
145EXPORT_SYMBOL_GPL(unregister_nfs_version);
146
147
148
149
150
151
152
153struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
154{
155 struct nfs_client *clp;
156 int err = -ENOMEM;
157
158 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
159 goto error_0;
160
161 clp->cl_minorversion = cl_init->minorversion;
162 clp->cl_nfs_mod = cl_init->nfs_mod;
163 if (!try_module_get(clp->cl_nfs_mod->owner))
164 goto error_dealloc;
165
166 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
167
168 refcount_set(&clp->cl_count, 1);
169 clp->cl_cons_state = NFS_CS_INITING;
170
171 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
172 clp->cl_addrlen = cl_init->addrlen;
173
174 if (cl_init->hostname) {
175 err = -ENOMEM;
176 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
177 if (!clp->cl_hostname)
178 goto error_cleanup;
179 }
180
181 INIT_LIST_HEAD(&clp->cl_superblocks);
182 clp->cl_rpcclient = ERR_PTR(-EINVAL);
183
184 clp->cl_proto = cl_init->proto;
185 clp->cl_nconnect = cl_init->nconnect;
186 clp->cl_net = get_net(cl_init->net);
187
188 clp->cl_principal = "*";
189 nfs_fscache_get_client_cookie(clp);
190
191 return clp;
192
193error_cleanup:
194 put_nfs_version(clp->cl_nfs_mod);
195error_dealloc:
196 kfree(clp);
197error_0:
198 return ERR_PTR(err);
199}
200EXPORT_SYMBOL_GPL(nfs_alloc_client);
201
202#if IS_ENABLED(CONFIG_NFS_V4)
203static void nfs_cleanup_cb_ident_idr(struct net *net)
204{
205 struct nfs_net *nn = net_generic(net, nfs_net_id);
206
207 idr_destroy(&nn->cb_ident_idr);
208}
209
210
211static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
212{
213 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
214
215 if (clp->cl_cb_ident)
216 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
217}
218
219static void pnfs_init_server(struct nfs_server *server)
220{
221 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
222}
223
224#else
225static void nfs_cleanup_cb_ident_idr(struct net *net)
226{
227}
228
229static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
230{
231}
232
233static void pnfs_init_server(struct nfs_server *server)
234{
235}
236
237#endif
238
239
240
241
242void nfs_free_client(struct nfs_client *clp)
243{
244 nfs_fscache_release_client_cookie(clp);
245
246
247 if (!IS_ERR(clp->cl_rpcclient))
248 rpc_shutdown_client(clp->cl_rpcclient);
249
250 put_net(clp->cl_net);
251 put_nfs_version(clp->cl_nfs_mod);
252 kfree(clp->cl_hostname);
253 kfree(clp->cl_acceptor);
254 kfree(clp);
255}
256EXPORT_SYMBOL_GPL(nfs_free_client);
257
258
259
260
261void nfs_put_client(struct nfs_client *clp)
262{
263 struct nfs_net *nn;
264
265 if (!clp)
266 return;
267
268 nn = net_generic(clp->cl_net, nfs_net_id);
269
270 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
271 list_del(&clp->cl_share_link);
272 nfs_cb_idr_remove_locked(clp);
273 spin_unlock(&nn->nfs_client_lock);
274
275 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
276
277 clp->rpc_ops->free_client(clp);
278 }
279}
280EXPORT_SYMBOL_GPL(nfs_put_client);
281
282
283
284
285
286static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
287{
288 struct nfs_client *clp;
289 const struct sockaddr *sap = data->addr;
290 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
291 int error;
292
293again:
294 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
295 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
296
297 if (clp->cl_cons_state < 0)
298 continue;
299
300
301 if (clp->cl_cons_state > NFS_CS_READY) {
302 refcount_inc(&clp->cl_count);
303 spin_unlock(&nn->nfs_client_lock);
304 error = nfs_wait_client_init_complete(clp);
305 nfs_put_client(clp);
306 spin_lock(&nn->nfs_client_lock);
307 if (error < 0)
308 return ERR_PTR(error);
309 goto again;
310 }
311
312
313 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
314 continue;
315
316 if (clp->cl_proto != data->proto)
317 continue;
318
319 if (clp->cl_minorversion != data->minorversion)
320 continue;
321
322
323 if (test_bit(NFS_CS_DS, &data->init_flags) !=
324 test_bit(NFS_CS_DS, &clp->cl_flags))
325 continue;
326
327
328 if (!rpc_cmp_addr_port(sap, clap))
329
330 if (IS_ERR(clp->cl_rpcclient) ||
331 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
332 sap))
333 continue;
334
335 refcount_inc(&clp->cl_count);
336 return clp;
337 }
338 return NULL;
339}
340
341
342
343
344
345
346bool nfs_client_init_is_complete(const struct nfs_client *clp)
347{
348 return clp->cl_cons_state <= NFS_CS_READY;
349}
350EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
351
352
353
354
355
356
357
358int nfs_client_init_status(const struct nfs_client *clp)
359{
360
361 if (clp->cl_cons_state > NFS_CS_READY) {
362 WARN_ON_ONCE(1);
363 return -EINVAL;
364 }
365 return clp->cl_cons_state;
366}
367EXPORT_SYMBOL_GPL(nfs_client_init_status);
368
369int nfs_wait_client_init_complete(const struct nfs_client *clp)
370{
371 return wait_event_killable(nfs_client_active_wq,
372 nfs_client_init_is_complete(clp));
373}
374EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
375
376
377
378
379static struct nfs_client *
380nfs_found_client(const struct nfs_client_initdata *cl_init,
381 struct nfs_client *clp)
382{
383 int error;
384
385 error = nfs_wait_client_init_complete(clp);
386 if (error < 0) {
387 nfs_put_client(clp);
388 return ERR_PTR(-ERESTARTSYS);
389 }
390
391 if (clp->cl_cons_state < NFS_CS_READY) {
392 error = clp->cl_cons_state;
393 nfs_put_client(clp);
394 return ERR_PTR(error);
395 }
396
397 smp_rmb();
398 return clp;
399}
400
401
402
403
404
405struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
406{
407 struct nfs_client *clp, *new = NULL;
408 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
409 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
410
411 if (cl_init->hostname == NULL) {
412 WARN_ON(1);
413 return ERR_PTR(-EINVAL);
414 }
415
416
417 do {
418 spin_lock(&nn->nfs_client_lock);
419
420 clp = nfs_match_client(cl_init);
421 if (clp) {
422 spin_unlock(&nn->nfs_client_lock);
423 if (new)
424 new->rpc_ops->free_client(new);
425 if (IS_ERR(clp))
426 return clp;
427 return nfs_found_client(cl_init, clp);
428 }
429 if (new) {
430 list_add_tail(&new->cl_share_link,
431 &nn->nfs_client_list);
432 spin_unlock(&nn->nfs_client_lock);
433 new->cl_flags = cl_init->init_flags;
434 return rpc_ops->init_client(new, cl_init);
435 }
436
437 spin_unlock(&nn->nfs_client_lock);
438
439 new = rpc_ops->alloc_client(cl_init);
440 } while (!IS_ERR(new));
441
442 return new;
443}
444EXPORT_SYMBOL_GPL(nfs_get_client);
445
446
447
448
449void nfs_mark_client_ready(struct nfs_client *clp, int state)
450{
451 smp_wmb();
452 clp->cl_cons_state = state;
453 wake_up_all(&nfs_client_active_wq);
454}
455EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
456
457
458
459
460void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
461 int timeo, int retrans)
462{
463 to->to_initval = timeo * HZ / 10;
464 to->to_retries = retrans;
465
466 switch (proto) {
467 case XPRT_TRANSPORT_TCP:
468 case XPRT_TRANSPORT_RDMA:
469 if (retrans == NFS_UNSPEC_RETRANS)
470 to->to_retries = NFS_DEF_TCP_RETRANS;
471 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
472 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
473 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
474 to->to_initval = NFS_MAX_TCP_TIMEOUT;
475 to->to_increment = to->to_initval;
476 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
477 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
478 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
479 if (to->to_maxval < to->to_initval)
480 to->to_maxval = to->to_initval;
481 to->to_exponential = 0;
482 break;
483 case XPRT_TRANSPORT_UDP:
484 if (retrans == NFS_UNSPEC_RETRANS)
485 to->to_retries = NFS_DEF_UDP_RETRANS;
486 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
487 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
488 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
489 to->to_initval = NFS_MAX_UDP_TIMEOUT;
490 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
491 to->to_exponential = 1;
492 break;
493 default:
494 BUG();
495 }
496}
497EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
498
499
500
501
502int nfs_create_rpc_client(struct nfs_client *clp,
503 const struct nfs_client_initdata *cl_init,
504 rpc_authflavor_t flavor)
505{
506 struct rpc_clnt *clnt = NULL;
507 struct rpc_create_args args = {
508 .net = clp->cl_net,
509 .protocol = clp->cl_proto,
510 .nconnect = clp->cl_nconnect,
511 .address = (struct sockaddr *)&clp->cl_addr,
512 .addrsize = clp->cl_addrlen,
513 .timeout = cl_init->timeparms,
514 .servername = clp->cl_hostname,
515 .nodename = cl_init->nodename,
516 .program = &nfs_program,
517 .version = clp->rpc_ops->version,
518 .authflavor = flavor,
519 .cred = cl_init->cred,
520 };
521
522 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
523 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
524 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
525 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
526 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
527 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
528 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
529 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
530 if (test_bit(NFS_CS_NOPING, &clp->cl_flags))
531 args.flags |= RPC_CLNT_CREATE_NOPING;
532 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags))
533 args.flags |= RPC_CLNT_CREATE_REUSEPORT;
534
535 if (!IS_ERR(clp->cl_rpcclient))
536 return 0;
537
538 clnt = rpc_create(&args);
539 if (IS_ERR(clnt)) {
540 dprintk("%s: cannot create RPC client. Error = %ld\n",
541 __func__, PTR_ERR(clnt));
542 return PTR_ERR(clnt);
543 }
544
545 clnt->cl_principal = clp->cl_principal;
546 clp->cl_rpcclient = clnt;
547 return 0;
548}
549EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
550
551
552
553
554static void nfs_destroy_server(struct nfs_server *server)
555{
556 if (server->nlm_host)
557 nlmclnt_done(server->nlm_host);
558}
559
560
561
562
563static int nfs_start_lockd(struct nfs_server *server)
564{
565 struct nlm_host *host;
566 struct nfs_client *clp = server->nfs_client;
567 struct nlmclnt_initdata nlm_init = {
568 .hostname = clp->cl_hostname,
569 .address = (struct sockaddr *)&clp->cl_addr,
570 .addrlen = clp->cl_addrlen,
571 .nfs_version = clp->rpc_ops->version,
572 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
573 1 : 0,
574 .net = clp->cl_net,
575 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
576 .cred = server->cred,
577 };
578
579 if (nlm_init.nfs_version > 3)
580 return 0;
581 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
582 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
583 return 0;
584
585 switch (clp->cl_proto) {
586 default:
587 nlm_init.protocol = IPPROTO_TCP;
588 break;
589 case XPRT_TRANSPORT_UDP:
590 nlm_init.protocol = IPPROTO_UDP;
591 }
592
593 host = nlmclnt_init(&nlm_init);
594 if (IS_ERR(host))
595 return PTR_ERR(host);
596
597 server->nlm_host = host;
598 server->destroy = nfs_destroy_server;
599 return 0;
600}
601
602
603
604
605int nfs_init_server_rpcclient(struct nfs_server *server,
606 const struct rpc_timeout *timeo,
607 rpc_authflavor_t pseudoflavour)
608{
609 struct nfs_client *clp = server->nfs_client;
610
611 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
612 pseudoflavour);
613 if (IS_ERR(server->client)) {
614 dprintk("%s: couldn't create rpc_client!\n", __func__);
615 return PTR_ERR(server->client);
616 }
617
618 memcpy(&server->client->cl_timeout_default,
619 timeo,
620 sizeof(server->client->cl_timeout_default));
621 server->client->cl_timeout = &server->client->cl_timeout_default;
622 server->client->cl_softrtry = 0;
623 if (server->flags & NFS_MOUNT_SOFTERR)
624 server->client->cl_softerr = 1;
625 if (server->flags & NFS_MOUNT_SOFT)
626 server->client->cl_softrtry = 1;
627
628 return 0;
629}
630EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
631
632
633
634
635
636
637
638
639
640struct nfs_client *nfs_init_client(struct nfs_client *clp,
641 const struct nfs_client_initdata *cl_init)
642{
643 int error;
644
645
646 if (clp->cl_cons_state == NFS_CS_READY)
647 return clp;
648
649
650
651
652
653 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
654 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
655 if (error < 0) {
656 nfs_put_client(clp);
657 clp = ERR_PTR(error);
658 }
659 return clp;
660}
661EXPORT_SYMBOL_GPL(nfs_init_client);
662
663
664
665
666static int nfs_init_server(struct nfs_server *server,
667 const struct fs_context *fc)
668{
669 const struct nfs_fs_context *ctx = nfs_fc2context(fc);
670 struct rpc_timeout timeparms;
671 struct nfs_client_initdata cl_init = {
672 .hostname = ctx->nfs_server.hostname,
673 .addr = (const struct sockaddr *)&ctx->nfs_server.address,
674 .addrlen = ctx->nfs_server.addrlen,
675 .nfs_mod = ctx->nfs_mod,
676 .proto = ctx->nfs_server.protocol,
677 .net = fc->net_ns,
678 .timeparms = &timeparms,
679 .cred = server->cred,
680 .nconnect = ctx->nfs_server.nconnect,
681 .init_flags = (1UL << NFS_CS_REUSEPORT),
682 };
683 struct nfs_client *clp;
684 int error;
685
686 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
687 ctx->timeo, ctx->retrans);
688 if (ctx->flags & NFS_MOUNT_NORESVPORT)
689 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
690
691
692 clp = nfs_get_client(&cl_init);
693 if (IS_ERR(clp))
694 return PTR_ERR(clp);
695
696 server->nfs_client = clp;
697
698
699 server->flags = ctx->flags;
700 server->options = ctx->options;
701 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
702 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
703 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
704
705 if (ctx->rsize)
706 server->rsize = nfs_block_size(ctx->rsize, NULL);
707 if (ctx->wsize)
708 server->wsize = nfs_block_size(ctx->wsize, NULL);
709
710 server->acregmin = ctx->acregmin * HZ;
711 server->acregmax = ctx->acregmax * HZ;
712 server->acdirmin = ctx->acdirmin * HZ;
713 server->acdirmax = ctx->acdirmax * HZ;
714
715
716 error = nfs_start_lockd(server);
717 if (error < 0)
718 goto error;
719
720 server->port = ctx->nfs_server.port;
721 server->auth_info = ctx->auth_info;
722
723 error = nfs_init_server_rpcclient(server, &timeparms,
724 ctx->selected_flavor);
725 if (error < 0)
726 goto error;
727
728
729 if (ctx->mount_server.addrlen) {
730 memcpy(&server->mountd_address, &ctx->mount_server.address,
731 ctx->mount_server.addrlen);
732 server->mountd_addrlen = ctx->mount_server.addrlen;
733 }
734 server->mountd_version = ctx->mount_server.version;
735 server->mountd_port = ctx->mount_server.port;
736 server->mountd_protocol = ctx->mount_server.protocol;
737
738 server->namelen = ctx->namlen;
739 return 0;
740
741error:
742 server->nfs_client = NULL;
743 nfs_put_client(clp);
744 return error;
745}
746
747
748
749
750static void nfs_server_set_fsinfo(struct nfs_server *server,
751 struct nfs_fsinfo *fsinfo)
752{
753 unsigned long max_rpc_payload, raw_max_rpc_payload;
754
755
756 if (server->rsize == 0)
757 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
758 if (server->wsize == 0)
759 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
760
761 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
762 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
763 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
764 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
765
766 raw_max_rpc_payload = rpc_max_payload(server->client);
767 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL);
768
769 if (server->rsize > max_rpc_payload)
770 server->rsize = max_rpc_payload;
771 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
772 server->rsize = NFS_MAX_FILE_IO_SIZE;
773 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
774
775 if (server->wsize > max_rpc_payload)
776 server->wsize = max_rpc_payload;
777 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
778 server->wsize = NFS_MAX_FILE_IO_SIZE;
779 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
780
781 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
782
783 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
784 if (server->dtsize > NFS_MAX_FILE_IO_SIZE)
785 server->dtsize = NFS_MAX_FILE_IO_SIZE;
786 if (server->dtsize > server->rsize)
787 server->dtsize = server->rsize;
788
789 if (server->flags & NFS_MOUNT_NOAC) {
790 server->acregmin = server->acregmax = 0;
791 server->acdirmin = server->acdirmax = 0;
792 }
793
794 server->maxfilesize = fsinfo->maxfilesize;
795
796 server->time_delta = fsinfo->time_delta;
797
798 server->clone_blksize = fsinfo->clone_blksize;
799
800 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
801
802#ifdef CONFIG_NFS_V4_2
803
804
805
806 server->gxasize = min_t(unsigned int, raw_max_rpc_payload,
807 XATTR_SIZE_MAX);
808 server->sxasize = min_t(unsigned int, raw_max_rpc_payload,
809 XATTR_SIZE_MAX);
810 server->lxasize = min_t(unsigned int, raw_max_rpc_payload,
811 nfs42_listxattr_xdrsize(XATTR_LIST_MAX));
812
813 if (fsinfo->xattr_support)
814 server->caps |= NFS_CAP_XATTR;
815#endif
816}
817
818
819
820
821int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
822{
823 struct nfs_fsinfo fsinfo;
824 struct nfs_client *clp = server->nfs_client;
825 int error;
826
827 if (clp->rpc_ops->set_capabilities != NULL) {
828 error = clp->rpc_ops->set_capabilities(server, mntfh);
829 if (error < 0)
830 return error;
831 }
832
833 fsinfo.fattr = fattr;
834 fsinfo.nlayouttypes = 0;
835 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
836 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
837 if (error < 0)
838 return error;
839
840 nfs_server_set_fsinfo(server, &fsinfo);
841
842
843 if (server->namelen == 0) {
844 struct nfs_pathconf pathinfo;
845
846 pathinfo.fattr = fattr;
847 nfs_fattr_init(fattr);
848
849 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
850 server->namelen = pathinfo.max_namelen;
851 }
852
853 return 0;
854}
855EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
856
857
858
859
860void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
861{
862 target->flags = source->flags;
863 target->rsize = source->rsize;
864 target->wsize = source->wsize;
865 target->acregmin = source->acregmin;
866 target->acregmax = source->acregmax;
867 target->acdirmin = source->acdirmin;
868 target->acdirmax = source->acdirmax;
869 target->caps = source->caps;
870 target->options = source->options;
871 target->auth_info = source->auth_info;
872 target->port = source->port;
873}
874EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
875
876void nfs_server_insert_lists(struct nfs_server *server)
877{
878 struct nfs_client *clp = server->nfs_client;
879 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
880
881 spin_lock(&nn->nfs_client_lock);
882 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
883 list_add_tail(&server->master_link, &nn->nfs_volume_list);
884 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
885 spin_unlock(&nn->nfs_client_lock);
886
887}
888EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
889
890void nfs_server_remove_lists(struct nfs_server *server)
891{
892 struct nfs_client *clp = server->nfs_client;
893 struct nfs_net *nn;
894
895 if (clp == NULL)
896 return;
897 nn = net_generic(clp->cl_net, nfs_net_id);
898 spin_lock(&nn->nfs_client_lock);
899 list_del_rcu(&server->client_link);
900 if (list_empty(&clp->cl_superblocks))
901 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
902 list_del(&server->master_link);
903 spin_unlock(&nn->nfs_client_lock);
904
905 synchronize_rcu();
906}
907EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
908
909
910
911
912struct nfs_server *nfs_alloc_server(void)
913{
914 struct nfs_server *server;
915
916 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
917 if (!server)
918 return NULL;
919
920 server->client = server->client_acl = ERR_PTR(-EINVAL);
921
922
923 INIT_LIST_HEAD(&server->client_link);
924 INIT_LIST_HEAD(&server->master_link);
925 INIT_LIST_HEAD(&server->delegations);
926 INIT_LIST_HEAD(&server->layouts);
927 INIT_LIST_HEAD(&server->state_owners_lru);
928 INIT_LIST_HEAD(&server->ss_copies);
929
930 atomic_set(&server->active, 0);
931
932 server->io_stats = nfs_alloc_iostats();
933 if (!server->io_stats) {
934 kfree(server);
935 return NULL;
936 }
937
938 ida_init(&server->openowner_id);
939 ida_init(&server->lockowner_id);
940 pnfs_init_server(server);
941 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
942
943 return server;
944}
945EXPORT_SYMBOL_GPL(nfs_alloc_server);
946
947
948
949
950void nfs_free_server(struct nfs_server *server)
951{
952 nfs_server_remove_lists(server);
953
954 if (server->destroy != NULL)
955 server->destroy(server);
956
957 if (!IS_ERR(server->client_acl))
958 rpc_shutdown_client(server->client_acl);
959 if (!IS_ERR(server->client))
960 rpc_shutdown_client(server->client);
961
962 nfs_put_client(server->nfs_client);
963
964 ida_destroy(&server->lockowner_id);
965 ida_destroy(&server->openowner_id);
966 nfs_free_iostats(server->io_stats);
967 put_cred(server->cred);
968 kfree(server);
969 nfs_release_automount_timer();
970}
971EXPORT_SYMBOL_GPL(nfs_free_server);
972
973
974
975
976
977struct nfs_server *nfs_create_server(struct fs_context *fc)
978{
979 struct nfs_fs_context *ctx = nfs_fc2context(fc);
980 struct nfs_server *server;
981 struct nfs_fattr *fattr;
982 int error;
983
984 server = nfs_alloc_server();
985 if (!server)
986 return ERR_PTR(-ENOMEM);
987
988 server->cred = get_cred(fc->cred);
989
990 error = -ENOMEM;
991 fattr = nfs_alloc_fattr();
992 if (fattr == NULL)
993 goto error;
994
995
996 error = nfs_init_server(server, fc);
997 if (error < 0)
998 goto error;
999
1000
1001 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
1002 if (error < 0)
1003 goto error;
1004 if (server->nfs_client->rpc_ops->version == 3) {
1005 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1006 server->namelen = NFS3_MAXNAMLEN;
1007 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
1008 server->caps |= NFS_CAP_READDIRPLUS;
1009 } else {
1010 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1011 server->namelen = NFS2_MAXNAMLEN;
1012 }
1013
1014 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1015 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh,
1016 fattr, NULL, NULL);
1017 if (error < 0) {
1018 dprintk("nfs_create_server: getattr error = %d\n", -error);
1019 goto error;
1020 }
1021 }
1022 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1023
1024 dprintk("Server FSID: %llx:%llx\n",
1025 (unsigned long long) server->fsid.major,
1026 (unsigned long long) server->fsid.minor);
1027
1028 nfs_server_insert_lists(server);
1029 server->mount_time = jiffies;
1030 nfs_free_fattr(fattr);
1031 return server;
1032
1033error:
1034 nfs_free_fattr(fattr);
1035 nfs_free_server(server);
1036 return ERR_PTR(error);
1037}
1038EXPORT_SYMBOL_GPL(nfs_create_server);
1039
1040
1041
1042
1043struct nfs_server *nfs_clone_server(struct nfs_server *source,
1044 struct nfs_fh *fh,
1045 struct nfs_fattr *fattr,
1046 rpc_authflavor_t flavor)
1047{
1048 struct nfs_server *server;
1049 struct nfs_fattr *fattr_fsinfo;
1050 int error;
1051
1052 server = nfs_alloc_server();
1053 if (!server)
1054 return ERR_PTR(-ENOMEM);
1055
1056 server->cred = get_cred(source->cred);
1057
1058 error = -ENOMEM;
1059 fattr_fsinfo = nfs_alloc_fattr();
1060 if (fattr_fsinfo == NULL)
1061 goto out_free_server;
1062
1063
1064 server->nfs_client = source->nfs_client;
1065 server->destroy = source->destroy;
1066 refcount_inc(&server->nfs_client->cl_count);
1067 nfs_server_copy_userdata(server, source);
1068
1069 server->fsid = fattr->fsid;
1070
1071 error = nfs_init_server_rpcclient(server,
1072 source->client->cl_timeout,
1073 flavor);
1074 if (error < 0)
1075 goto out_free_server;
1076
1077
1078 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1079 if (error < 0)
1080 goto out_free_server;
1081
1082 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1083 server->namelen = NFS4_MAXNAMLEN;
1084
1085 error = nfs_start_lockd(server);
1086 if (error < 0)
1087 goto out_free_server;
1088
1089 nfs_server_insert_lists(server);
1090 server->mount_time = jiffies;
1091
1092 nfs_free_fattr(fattr_fsinfo);
1093 return server;
1094
1095out_free_server:
1096 nfs_free_fattr(fattr_fsinfo);
1097 nfs_free_server(server);
1098 return ERR_PTR(error);
1099}
1100EXPORT_SYMBOL_GPL(nfs_clone_server);
1101
1102void nfs_clients_init(struct net *net)
1103{
1104 struct nfs_net *nn = net_generic(net, nfs_net_id);
1105
1106 INIT_LIST_HEAD(&nn->nfs_client_list);
1107 INIT_LIST_HEAD(&nn->nfs_volume_list);
1108#if IS_ENABLED(CONFIG_NFS_V4)
1109 idr_init(&nn->cb_ident_idr);
1110#endif
1111 spin_lock_init(&nn->nfs_client_lock);
1112 nn->boot_time = ktime_get_real();
1113
1114 nfs_netns_sysfs_setup(nn, net);
1115}
1116
1117void nfs_clients_exit(struct net *net)
1118{
1119 struct nfs_net *nn = net_generic(net, nfs_net_id);
1120
1121 nfs_netns_sysfs_destroy(nn);
1122 nfs_cleanup_cb_ident_idr(net);
1123 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
1124 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1125}
1126
1127#ifdef CONFIG_PROC_FS
1128static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1129static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1130static void nfs_server_list_stop(struct seq_file *p, void *v);
1131static int nfs_server_list_show(struct seq_file *m, void *v);
1132
1133static const struct seq_operations nfs_server_list_ops = {
1134 .start = nfs_server_list_start,
1135 .next = nfs_server_list_next,
1136 .stop = nfs_server_list_stop,
1137 .show = nfs_server_list_show,
1138};
1139
1140static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1141static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1142static void nfs_volume_list_stop(struct seq_file *p, void *v);
1143static int nfs_volume_list_show(struct seq_file *m, void *v);
1144
1145static const struct seq_operations nfs_volume_list_ops = {
1146 .start = nfs_volume_list_start,
1147 .next = nfs_volume_list_next,
1148 .stop = nfs_volume_list_stop,
1149 .show = nfs_volume_list_show,
1150};
1151
1152
1153
1154
1155static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1156 __acquires(&nn->nfs_client_lock)
1157{
1158 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1159
1160
1161 spin_lock(&nn->nfs_client_lock);
1162 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1163}
1164
1165
1166
1167
1168static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1169{
1170 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1171
1172 return seq_list_next(v, &nn->nfs_client_list, pos);
1173}
1174
1175
1176
1177
1178static void nfs_server_list_stop(struct seq_file *p, void *v)
1179 __releases(&nn->nfs_client_lock)
1180{
1181 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1182
1183 spin_unlock(&nn->nfs_client_lock);
1184}
1185
1186
1187
1188
1189static int nfs_server_list_show(struct seq_file *m, void *v)
1190{
1191 struct nfs_client *clp;
1192 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1193
1194
1195 if (v == &nn->nfs_client_list) {
1196 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1197 return 0;
1198 }
1199
1200
1201 clp = list_entry(v, struct nfs_client, cl_share_link);
1202
1203
1204 if (clp->cl_cons_state != NFS_CS_READY)
1205 return 0;
1206
1207 rcu_read_lock();
1208 seq_printf(m, "v%u %s %s %3d %s\n",
1209 clp->rpc_ops->version,
1210 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1211 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1212 refcount_read(&clp->cl_count),
1213 clp->cl_hostname);
1214 rcu_read_unlock();
1215
1216 return 0;
1217}
1218
1219
1220
1221
1222static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1223 __acquires(&nn->nfs_client_lock)
1224{
1225 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1226
1227
1228 spin_lock(&nn->nfs_client_lock);
1229 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1230}
1231
1232
1233
1234
1235static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1236{
1237 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1238
1239 return seq_list_next(v, &nn->nfs_volume_list, pos);
1240}
1241
1242
1243
1244
1245static void nfs_volume_list_stop(struct seq_file *p, void *v)
1246 __releases(&nn->nfs_client_lock)
1247{
1248 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1249
1250 spin_unlock(&nn->nfs_client_lock);
1251}
1252
1253
1254
1255
1256static int nfs_volume_list_show(struct seq_file *m, void *v)
1257{
1258 struct nfs_server *server;
1259 struct nfs_client *clp;
1260 char dev[13];
1261 char fsid[34];
1262 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1263
1264
1265 if (v == &nn->nfs_volume_list) {
1266 seq_puts(m, "NV SERVER PORT DEV FSID"
1267 " FSC\n");
1268 return 0;
1269 }
1270
1271 server = list_entry(v, struct nfs_server, master_link);
1272 clp = server->nfs_client;
1273
1274 snprintf(dev, sizeof(dev), "%u:%u",
1275 MAJOR(server->s_dev), MINOR(server->s_dev));
1276
1277 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1278 (unsigned long long) server->fsid.major,
1279 (unsigned long long) server->fsid.minor);
1280
1281 rcu_read_lock();
1282 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1283 clp->rpc_ops->version,
1284 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1285 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1286 dev,
1287 fsid,
1288 nfs_server_fscache_state(server));
1289 rcu_read_unlock();
1290
1291 return 0;
1292}
1293
1294int nfs_fs_proc_net_init(struct net *net)
1295{
1296 struct nfs_net *nn = net_generic(net, nfs_net_id);
1297 struct proc_dir_entry *p;
1298
1299 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1300 if (!nn->proc_nfsfs)
1301 goto error_0;
1302
1303
1304 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1305 &nfs_server_list_ops, sizeof(struct seq_net_private));
1306 if (!p)
1307 goto error_1;
1308
1309
1310 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1311 &nfs_volume_list_ops, sizeof(struct seq_net_private));
1312 if (!p)
1313 goto error_1;
1314 return 0;
1315
1316error_1:
1317 remove_proc_subtree("nfsfs", net->proc_net);
1318error_0:
1319 return -ENOMEM;
1320}
1321
1322void nfs_fs_proc_net_exit(struct net *net)
1323{
1324 remove_proc_subtree("nfsfs", net->proc_net);
1325}
1326
1327
1328
1329
1330int __init nfs_fs_proc_init(void)
1331{
1332 if (!proc_mkdir("fs/nfsfs", NULL))
1333 goto error_0;
1334
1335
1336 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1337 goto error_1;
1338
1339
1340 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1341 goto error_1;
1342
1343 return 0;
1344error_1:
1345 remove_proc_subtree("fs/nfsfs", NULL);
1346error_0:
1347 return -ENOMEM;
1348}
1349
1350
1351
1352
1353void nfs_fs_proc_exit(void)
1354{
1355 remove_proc_subtree("fs/nfsfs", NULL);
1356}
1357
1358#endif
1359