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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* client.c: NFS client sharing and management code
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/sched.h>
12#include <linux/time.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/string.h>
16#include <linux/stat.h>
17#include <linux/errno.h>
18#include <linux/unistd.h>
19#include <linux/sunrpc/addr.h>
20#include <linux/sunrpc/clnt.h>
21#include <linux/sunrpc/stats.h>
22#include <linux/sunrpc/metrics.h>
23#include <linux/sunrpc/xprtsock.h>
24#include <linux/sunrpc/xprtrdma.h>
25#include <linux/nfs_fs.h>
26#include <linux/nfs_mount.h>
27#include <linux/nfs4_mount.h>
28#include <linux/lockd/bind.h>
29#include <linux/seq_file.h>
30#include <linux/mount.h>
31#include <linux/vfs.h>
32#include <linux/inet.h>
33#include <linux/in6.h>
34#include <linux/slab.h>
35#include <linux/idr.h>
36#include <net/ipv6.h>
37#include <linux/nfs_xdr.h>
38#include <linux/sunrpc/bc_xprt.h>
39#include <linux/nsproxy.h>
40#include <linux/pid_namespace.h>
41
42
43#include "nfs4_fs.h"
44#include "callback.h"
45#include "delegation.h"
46#include "iostat.h"
47#include "internal.h"
48#include "fscache.h"
49#include "pnfs.h"
50#include "nfs.h"
51#include "netns.h"
52#include "sysfs.h"
53#include "nfs42.h"
54
55#define NFSDBG_FACILITY NFSDBG_CLIENT
56
57static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
58static DEFINE_SPINLOCK(nfs_version_lock);
59static DEFINE_MUTEX(nfs_version_mutex);
60static LIST_HEAD(nfs_versions);
61
62/*
63 * RPC cruft for NFS
64 */
65static const struct rpc_version *nfs_version[5] = {
66 [2] = NULL,
67 [3] = NULL,
68 [4] = NULL,
69};
70
71const struct rpc_program nfs_program = {
72 .name = "nfs",
73 .number = NFS_PROGRAM,
74 .nrvers = ARRAY_SIZE(nfs_version),
75 .version = nfs_version,
76 .stats = &nfs_rpcstat,
77 .pipe_dir_name = NFS_PIPE_DIRNAME,
78};
79
80struct rpc_stat nfs_rpcstat = {
81 .program = &nfs_program
82};
83
84static struct nfs_subversion *find_nfs_version(unsigned int version)
85{
86 struct nfs_subversion *nfs;
87 spin_lock(&nfs_version_lock);
88
89 list_for_each_entry(nfs, &nfs_versions, list) {
90 if (nfs->rpc_ops->version == version) {
91 spin_unlock(&nfs_version_lock);
92 return nfs;
93 }
94 }
95
96 spin_unlock(&nfs_version_lock);
97 return ERR_PTR(-EPROTONOSUPPORT);
98}
99
100struct nfs_subversion *get_nfs_version(unsigned int version)
101{
102 struct nfs_subversion *nfs = find_nfs_version(version);
103
104 if (IS_ERR(nfs)) {
105 mutex_lock(&nfs_version_mutex);
106 request_module("nfsv%d", version);
107 nfs = find_nfs_version(version);
108 mutex_unlock(&nfs_version_mutex);
109 }
110
111 if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
112 return ERR_PTR(-EAGAIN);
113 return nfs;
114}
115
116void put_nfs_version(struct nfs_subversion *nfs)
117{
118 module_put(nfs->owner);
119}
120
121void register_nfs_version(struct nfs_subversion *nfs)
122{
123 spin_lock(&nfs_version_lock);
124
125 list_add(&nfs->list, &nfs_versions);
126 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
127
128 spin_unlock(&nfs_version_lock);
129}
130EXPORT_SYMBOL_GPL(register_nfs_version);
131
132void unregister_nfs_version(struct nfs_subversion *nfs)
133{
134 spin_lock(&nfs_version_lock);
135
136 nfs_version[nfs->rpc_ops->version] = NULL;
137 list_del(&nfs->list);
138
139 spin_unlock(&nfs_version_lock);
140}
141EXPORT_SYMBOL_GPL(unregister_nfs_version);
142
143/*
144 * Allocate a shared client record
145 *
146 * Since these are allocated/deallocated very rarely, we don't
147 * bother putting them in a slab cache...
148 */
149struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
150{
151 struct nfs_client *clp;
152 int err = -ENOMEM;
153
154 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
155 goto error_0;
156
157 clp->cl_minorversion = cl_init->minorversion;
158 clp->cl_nfs_mod = cl_init->nfs_mod;
159 if (!try_module_get(clp->cl_nfs_mod->owner))
160 goto error_dealloc;
161
162 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
163
164 refcount_set(&clp->cl_count, 1);
165 clp->cl_cons_state = NFS_CS_INITING;
166
167 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
168 clp->cl_addrlen = cl_init->addrlen;
169
170 if (cl_init->hostname) {
171 err = -ENOMEM;
172 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
173 if (!clp->cl_hostname)
174 goto error_cleanup;
175 }
176
177 INIT_LIST_HEAD(&clp->cl_superblocks);
178 clp->cl_rpcclient = ERR_PTR(-EINVAL);
179
180 clp->cl_proto = cl_init->proto;
181 clp->cl_nconnect = cl_init->nconnect;
182 clp->cl_net = get_net(cl_init->net);
183
184 clp->cl_principal = "*";
185 nfs_fscache_get_client_cookie(clp);
186
187 return clp;
188
189error_cleanup:
190 put_nfs_version(clp->cl_nfs_mod);
191error_dealloc:
192 kfree(clp);
193error_0:
194 return ERR_PTR(err);
195}
196EXPORT_SYMBOL_GPL(nfs_alloc_client);
197
198#if IS_ENABLED(CONFIG_NFS_V4)
199static void nfs_cleanup_cb_ident_idr(struct net *net)
200{
201 struct nfs_net *nn = net_generic(net, nfs_net_id);
202
203 idr_destroy(&nn->cb_ident_idr);
204}
205
206/* nfs_client_lock held */
207static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
208{
209 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
210
211 if (clp->cl_cb_ident)
212 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
213}
214
215static void pnfs_init_server(struct nfs_server *server)
216{
217 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
218}
219
220#else
221static void nfs_cleanup_cb_ident_idr(struct net *net)
222{
223}
224
225static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
226{
227}
228
229static void pnfs_init_server(struct nfs_server *server)
230{
231}
232
233#endif /* CONFIG_NFS_V4 */
234
235/*
236 * Destroy a shared client record
237 */
238void nfs_free_client(struct nfs_client *clp)
239{
240 nfs_fscache_release_client_cookie(clp);
241
242 /* -EIO all pending I/O */
243 if (!IS_ERR(clp->cl_rpcclient))
244 rpc_shutdown_client(clp->cl_rpcclient);
245
246 put_net(clp->cl_net);
247 put_nfs_version(clp->cl_nfs_mod);
248 kfree(clp->cl_hostname);
249 kfree(clp->cl_acceptor);
250 kfree(clp);
251}
252EXPORT_SYMBOL_GPL(nfs_free_client);
253
254/*
255 * Release a reference to a shared client record
256 */
257void nfs_put_client(struct nfs_client *clp)
258{
259 struct nfs_net *nn;
260
261 if (!clp)
262 return;
263
264 nn = net_generic(clp->cl_net, nfs_net_id);
265
266 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
267 list_del(&clp->cl_share_link);
268 nfs_cb_idr_remove_locked(clp);
269 spin_unlock(&nn->nfs_client_lock);
270
271 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
272
273 clp->rpc_ops->free_client(clp);
274 }
275}
276EXPORT_SYMBOL_GPL(nfs_put_client);
277
278/*
279 * Find an nfs_client on the list that matches the initialisation data
280 * that is supplied.
281 */
282static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
283{
284 struct nfs_client *clp;
285 const struct sockaddr *sap = data->addr;
286 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
287 int error;
288
289again:
290 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
291 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
292 /* Don't match clients that failed to initialise properly */
293 if (clp->cl_cons_state < 0)
294 continue;
295
296 /* If a client is still initializing then we need to wait */
297 if (clp->cl_cons_state > NFS_CS_READY) {
298 refcount_inc(&clp->cl_count);
299 spin_unlock(&nn->nfs_client_lock);
300 error = nfs_wait_client_init_complete(clp);
301 nfs_put_client(clp);
302 spin_lock(&nn->nfs_client_lock);
303 if (error < 0)
304 return ERR_PTR(error);
305 goto again;
306 }
307
308 /* Different NFS versions cannot share the same nfs_client */
309 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
310 continue;
311
312 if (clp->cl_proto != data->proto)
313 continue;
314 /* Match nfsv4 minorversion */
315 if (clp->cl_minorversion != data->minorversion)
316 continue;
317
318 /* Match request for a dedicated DS */
319 if (test_bit(NFS_CS_DS, &data->init_flags) !=
320 test_bit(NFS_CS_DS, &clp->cl_flags))
321 continue;
322
323 /* Match the full socket address */
324 if (!rpc_cmp_addr_port(sap, clap))
325 /* Match all xprt_switch full socket addresses */
326 if (IS_ERR(clp->cl_rpcclient) ||
327 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
328 sap))
329 continue;
330
331 refcount_inc(&clp->cl_count);
332 return clp;
333 }
334 return NULL;
335}
336
337/*
338 * Return true if @clp is done initializing, false if still working on it.
339 *
340 * Use nfs_client_init_status to check if it was successful.
341 */
342bool nfs_client_init_is_complete(const struct nfs_client *clp)
343{
344 return clp->cl_cons_state <= NFS_CS_READY;
345}
346EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
347
348/*
349 * Return 0 if @clp was successfully initialized, -errno otherwise.
350 *
351 * This must be called *after* nfs_client_init_is_complete() returns true,
352 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
353 */
354int nfs_client_init_status(const struct nfs_client *clp)
355{
356 /* called without checking nfs_client_init_is_complete */
357 if (clp->cl_cons_state > NFS_CS_READY) {
358 WARN_ON_ONCE(1);
359 return -EINVAL;
360 }
361 return clp->cl_cons_state;
362}
363EXPORT_SYMBOL_GPL(nfs_client_init_status);
364
365int nfs_wait_client_init_complete(const struct nfs_client *clp)
366{
367 return wait_event_killable(nfs_client_active_wq,
368 nfs_client_init_is_complete(clp));
369}
370EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
371
372/*
373 * Found an existing client. Make sure it's ready before returning.
374 */
375static struct nfs_client *
376nfs_found_client(const struct nfs_client_initdata *cl_init,
377 struct nfs_client *clp)
378{
379 int error;
380
381 error = nfs_wait_client_init_complete(clp);
382 if (error < 0) {
383 nfs_put_client(clp);
384 return ERR_PTR(-ERESTARTSYS);
385 }
386
387 if (clp->cl_cons_state < NFS_CS_READY) {
388 error = clp->cl_cons_state;
389 nfs_put_client(clp);
390 return ERR_PTR(error);
391 }
392
393 smp_rmb();
394 return clp;
395}
396
397/*
398 * Look up a client by IP address and protocol version
399 * - creates a new record if one doesn't yet exist
400 */
401struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
402{
403 struct nfs_client *clp, *new = NULL;
404 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
405 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
406
407 if (cl_init->hostname == NULL) {
408 WARN_ON(1);
409 return NULL;
410 }
411
412 /* see if the client already exists */
413 do {
414 spin_lock(&nn->nfs_client_lock);
415
416 clp = nfs_match_client(cl_init);
417 if (clp) {
418 spin_unlock(&nn->nfs_client_lock);
419 if (new)
420 new->rpc_ops->free_client(new);
421 if (IS_ERR(clp))
422 return clp;
423 return nfs_found_client(cl_init, clp);
424 }
425 if (new) {
426 list_add_tail(&new->cl_share_link,
427 &nn->nfs_client_list);
428 spin_unlock(&nn->nfs_client_lock);
429 new->cl_flags = cl_init->init_flags;
430 return rpc_ops->init_client(new, cl_init);
431 }
432
433 spin_unlock(&nn->nfs_client_lock);
434
435 new = rpc_ops->alloc_client(cl_init);
436 } while (!IS_ERR(new));
437
438 return new;
439}
440EXPORT_SYMBOL_GPL(nfs_get_client);
441
442/*
443 * Mark a server as ready or failed
444 */
445void nfs_mark_client_ready(struct nfs_client *clp, int state)
446{
447 smp_wmb();
448 clp->cl_cons_state = state;
449 wake_up_all(&nfs_client_active_wq);
450}
451EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
452
453/*
454 * Initialise the timeout values for a connection
455 */
456void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
457 int timeo, int retrans)
458{
459 to->to_initval = timeo * HZ / 10;
460 to->to_retries = retrans;
461
462 switch (proto) {
463 case XPRT_TRANSPORT_TCP:
464 case XPRT_TRANSPORT_RDMA:
465 if (retrans == NFS_UNSPEC_RETRANS)
466 to->to_retries = NFS_DEF_TCP_RETRANS;
467 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
468 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
469 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
470 to->to_initval = NFS_MAX_TCP_TIMEOUT;
471 to->to_increment = to->to_initval;
472 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
473 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
474 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
475 if (to->to_maxval < to->to_initval)
476 to->to_maxval = to->to_initval;
477 to->to_exponential = 0;
478 break;
479#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
480 case XPRT_TRANSPORT_UDP:
481 if (retrans == NFS_UNSPEC_RETRANS)
482 to->to_retries = NFS_DEF_UDP_RETRANS;
483 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
484 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
485 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
486 to->to_initval = NFS_MAX_UDP_TIMEOUT;
487 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
488 to->to_exponential = 1;
489 break;
490#endif
491 default:
492 BUG();
493 }
494}
495EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
496
497/*
498 * Create an RPC client handle
499 */
500int nfs_create_rpc_client(struct nfs_client *clp,
501 const struct nfs_client_initdata *cl_init,
502 rpc_authflavor_t flavor)
503{
504 struct rpc_clnt *clnt = NULL;
505 struct rpc_create_args args = {
506 .net = clp->cl_net,
507 .protocol = clp->cl_proto,
508 .nconnect = clp->cl_nconnect,
509 .address = (struct sockaddr *)&clp->cl_addr,
510 .addrsize = clp->cl_addrlen,
511 .timeout = cl_init->timeparms,
512 .servername = clp->cl_hostname,
513 .nodename = cl_init->nodename,
514 .program = &nfs_program,
515 .version = clp->rpc_ops->version,
516 .authflavor = flavor,
517 .cred = cl_init->cred,
518 };
519
520 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
521 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
522 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
523 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
524 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
525 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
526 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
527 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
528 if (test_bit(NFS_CS_NOPING, &clp->cl_flags))
529 args.flags |= RPC_CLNT_CREATE_NOPING;
530 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags))
531 args.flags |= RPC_CLNT_CREATE_REUSEPORT;
532
533 if (!IS_ERR(clp->cl_rpcclient))
534 return 0;
535
536 clnt = rpc_create(&args);
537 if (IS_ERR(clnt)) {
538 dprintk("%s: cannot create RPC client. Error = %ld\n",
539 __func__, PTR_ERR(clnt));
540 return PTR_ERR(clnt);
541 }
542
543 clnt->cl_principal = clp->cl_principal;
544 clp->cl_rpcclient = clnt;
545 return 0;
546}
547EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
548
549/*
550 * Version 2 or 3 client destruction
551 */
552static void nfs_destroy_server(struct nfs_server *server)
553{
554 if (server->nlm_host)
555 nlmclnt_done(server->nlm_host);
556}
557
558/*
559 * Version 2 or 3 lockd setup
560 */
561static int nfs_start_lockd(struct nfs_server *server)
562{
563 struct nlm_host *host;
564 struct nfs_client *clp = server->nfs_client;
565 struct nlmclnt_initdata nlm_init = {
566 .hostname = clp->cl_hostname,
567 .address = (struct sockaddr *)&clp->cl_addr,
568 .addrlen = clp->cl_addrlen,
569 .nfs_version = clp->rpc_ops->version,
570 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
571 1 : 0,
572 .net = clp->cl_net,
573 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
574 .cred = current_cred(),
575 };
576
577 if (nlm_init.nfs_version > 3)
578 return 0;
579 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
580 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
581 return 0;
582
583 switch (clp->cl_proto) {
584 default:
585 nlm_init.protocol = IPPROTO_TCP;
586 break;
587#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
588 case XPRT_TRANSPORT_UDP:
589 nlm_init.protocol = IPPROTO_UDP;
590#endif
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 * Create a general RPC client
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 * nfs_init_client - Initialise an NFS2 or NFS3 client
634 *
635 * @clp: nfs_client to initialise
636 * @cl_init: Initialisation parameters
637 *
638 * Returns pointer to an NFS client, or an ERR_PTR value.
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 /* the client is already initialised */
646 if (clp->cl_cons_state == NFS_CS_READY)
647 return clp;
648
649 /*
650 * Create a client RPC handle for doing FSSTAT with UNIX auth only
651 * - RFC 2623, sec 2.3.2
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 * Create a version 2 or 3 client
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 /* Allocate or find a client reference we can use */
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 /* Initialise the client representation from the mount data */
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 /* Start lockd here, before we might error out */
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 /* Preserve the values of mount_server-related mount options */
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 * Load up the server record from information gained in an fsinfo record
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 /* Work out a lot of parameters */
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 > PAGE_SIZE * NFS_MAX_READDIR_PAGES)
785 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES;
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 /* We're airborne Set socket buffersize */
800 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
801
802#ifdef CONFIG_NFS_V4_2
803 /*
804 * Defaults until limited by the session parameters.
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 * Probe filesystem information, including the FSID on v2/v3
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 /* Get some general file system info */
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 * Copy useful information when duplicating a server record
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 * Allocate and initialise a server record
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 /* Zero out the NFS state stuff */
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 * Free up a server record
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 * Create a version 2 or 3 volume record
975 * - keyed on server and FSID
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(current_cred());
989
990 error = -ENOMEM;
991 fattr = nfs_alloc_fattr();
992 if (fattr == NULL)
993 goto error;
994
995 /* Get a client representation */
996 error = nfs_init_server(server, fc);
997 if (error < 0)
998 goto error;
999
1000 /* Probe the root fh to retrieve its FSID */
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 * Clone an NFS2, NFS3 or NFS4 server record
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 /* Copy data from the source */
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 /* probe the filesystem info for this server filesystem */
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 * set up the iterator to start reading from the server list and return the first item
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 /* lock the list against modification */
1161 spin_lock(&nn->nfs_client_lock);
1162 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1163}
1164
1165/*
1166 * move to next server
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 * clean up after reading from the transports list
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 * display a header line followed by a load of call lines
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 /* display header on line 1 */
1195 if (v == &nn->nfs_client_list) {
1196 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1197 return 0;
1198 }
1199
1200 /* display one transport per line on subsequent lines */
1201 clp = list_entry(v, struct nfs_client, cl_share_link);
1202
1203 /* Check if the client is initialized */
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 * set up the iterator to start reading from the volume list and return the first item
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 /* lock the list against modification */
1228 spin_lock(&nn->nfs_client_lock);
1229 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1230}
1231
1232/*
1233 * move to next volume
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 * clean up after reading from the transports list
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 * display a header line followed by a load of call lines
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]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1261 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1262 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1263
1264 /* display header on line 1 */
1265 if (v == &nn->nfs_volume_list) {
1266 seq_puts(m, "NV SERVER PORT DEV FSID"
1267 " FSC\n");
1268 return 0;
1269 }
1270 /* display one transport per line on subsequent lines */
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 /* a file of servers with which we're dealing */
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 /* a file of volumes that we have mounted */
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 * initialise the /proc/fs/nfsfs/ directory
1329 */
1330int __init nfs_fs_proc_init(void)
1331{
1332 if (!proc_mkdir("fs/nfsfs", NULL))
1333 goto error_0;
1334
1335 /* a file of servers with which we're dealing */
1336 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1337 goto error_1;
1338
1339 /* a file of volumes that we have mounted */
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 * clean up the /proc/fs/nfsfs/ directory
1352 */
1353void nfs_fs_proc_exit(void)
1354{
1355 remove_proc_subtree("fs/nfsfs", NULL);
1356}
1357
1358#endif /* CONFIG_PROC_FS */
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* client.c: NFS client sharing and management code
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/sched.h>
12#include <linux/time.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/string.h>
16#include <linux/stat.h>
17#include <linux/errno.h>
18#include <linux/unistd.h>
19#include <linux/sunrpc/addr.h>
20#include <linux/sunrpc/clnt.h>
21#include <linux/sunrpc/stats.h>
22#include <linux/sunrpc/metrics.h>
23#include <linux/sunrpc/xprtsock.h>
24#include <linux/sunrpc/xprtrdma.h>
25#include <linux/nfs_fs.h>
26#include <linux/nfs_mount.h>
27#include <linux/nfs4_mount.h>
28#include <linux/lockd/bind.h>
29#include <linux/seq_file.h>
30#include <linux/mount.h>
31#include <linux/vfs.h>
32#include <linux/inet.h>
33#include <linux/in6.h>
34#include <linux/slab.h>
35#include <linux/idr.h>
36#include <net/ipv6.h>
37#include <linux/nfs_xdr.h>
38#include <linux/sunrpc/bc_xprt.h>
39#include <linux/nsproxy.h>
40#include <linux/pid_namespace.h>
41
42
43#include "nfs4_fs.h"
44#include "callback.h"
45#include "delegation.h"
46#include "iostat.h"
47#include "internal.h"
48#include "fscache.h"
49#include "pnfs.h"
50#include "nfs.h"
51#include "netns.h"
52#include "sysfs.h"
53#include "nfs42.h"
54
55#define NFSDBG_FACILITY NFSDBG_CLIENT
56
57static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
58static DEFINE_SPINLOCK(nfs_version_lock);
59static DEFINE_MUTEX(nfs_version_mutex);
60static LIST_HEAD(nfs_versions);
61
62/*
63 * RPC cruft for NFS
64 */
65static const struct rpc_version *nfs_version[5] = {
66 [2] = NULL,
67 [3] = NULL,
68 [4] = NULL,
69};
70
71const struct rpc_program nfs_program = {
72 .name = "nfs",
73 .number = NFS_PROGRAM,
74 .nrvers = ARRAY_SIZE(nfs_version),
75 .version = nfs_version,
76 .stats = &nfs_rpcstat,
77 .pipe_dir_name = NFS_PIPE_DIRNAME,
78};
79
80struct rpc_stat nfs_rpcstat = {
81 .program = &nfs_program
82};
83
84static struct nfs_subversion *find_nfs_version(unsigned int version)
85{
86 struct nfs_subversion *nfs;
87 spin_lock(&nfs_version_lock);
88
89 list_for_each_entry(nfs, &nfs_versions, list) {
90 if (nfs->rpc_ops->version == version) {
91 spin_unlock(&nfs_version_lock);
92 return nfs;
93 }
94 }
95
96 spin_unlock(&nfs_version_lock);
97 return ERR_PTR(-EPROTONOSUPPORT);
98}
99
100struct nfs_subversion *get_nfs_version(unsigned int version)
101{
102 struct nfs_subversion *nfs = find_nfs_version(version);
103
104 if (IS_ERR(nfs)) {
105 mutex_lock(&nfs_version_mutex);
106 request_module("nfsv%d", version);
107 nfs = find_nfs_version(version);
108 mutex_unlock(&nfs_version_mutex);
109 }
110
111 if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
112 return ERR_PTR(-EAGAIN);
113 return nfs;
114}
115
116void put_nfs_version(struct nfs_subversion *nfs)
117{
118 module_put(nfs->owner);
119}
120
121void register_nfs_version(struct nfs_subversion *nfs)
122{
123 spin_lock(&nfs_version_lock);
124
125 list_add(&nfs->list, &nfs_versions);
126 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
127
128 spin_unlock(&nfs_version_lock);
129}
130EXPORT_SYMBOL_GPL(register_nfs_version);
131
132void unregister_nfs_version(struct nfs_subversion *nfs)
133{
134 spin_lock(&nfs_version_lock);
135
136 nfs_version[nfs->rpc_ops->version] = NULL;
137 list_del(&nfs->list);
138
139 spin_unlock(&nfs_version_lock);
140}
141EXPORT_SYMBOL_GPL(unregister_nfs_version);
142
143/*
144 * Allocate a shared client record
145 *
146 * Since these are allocated/deallocated very rarely, we don't
147 * bother putting them in a slab cache...
148 */
149struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
150{
151 struct nfs_client *clp;
152 int err = -ENOMEM;
153
154 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
155 goto error_0;
156
157 clp->cl_minorversion = cl_init->minorversion;
158 clp->cl_nfs_mod = cl_init->nfs_mod;
159 if (!try_module_get(clp->cl_nfs_mod->owner))
160 goto error_dealloc;
161
162 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
163
164 refcount_set(&clp->cl_count, 1);
165 clp->cl_cons_state = NFS_CS_INITING;
166
167 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
168 clp->cl_addrlen = cl_init->addrlen;
169
170 if (cl_init->hostname) {
171 err = -ENOMEM;
172 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
173 if (!clp->cl_hostname)
174 goto error_cleanup;
175 }
176
177 INIT_LIST_HEAD(&clp->cl_superblocks);
178 clp->cl_rpcclient = ERR_PTR(-EINVAL);
179
180 clp->cl_proto = cl_init->proto;
181 clp->cl_nconnect = cl_init->nconnect;
182 clp->cl_net = get_net(cl_init->net);
183
184 clp->cl_principal = "*";
185 nfs_fscache_get_client_cookie(clp);
186
187 return clp;
188
189error_cleanup:
190 put_nfs_version(clp->cl_nfs_mod);
191error_dealloc:
192 kfree(clp);
193error_0:
194 return ERR_PTR(err);
195}
196EXPORT_SYMBOL_GPL(nfs_alloc_client);
197
198#if IS_ENABLED(CONFIG_NFS_V4)
199static void nfs_cleanup_cb_ident_idr(struct net *net)
200{
201 struct nfs_net *nn = net_generic(net, nfs_net_id);
202
203 idr_destroy(&nn->cb_ident_idr);
204}
205
206/* nfs_client_lock held */
207static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
208{
209 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
210
211 if (clp->cl_cb_ident)
212 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
213}
214
215static void pnfs_init_server(struct nfs_server *server)
216{
217 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
218}
219
220#else
221static void nfs_cleanup_cb_ident_idr(struct net *net)
222{
223}
224
225static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
226{
227}
228
229static void pnfs_init_server(struct nfs_server *server)
230{
231}
232
233#endif /* CONFIG_NFS_V4 */
234
235/*
236 * Destroy a shared client record
237 */
238void nfs_free_client(struct nfs_client *clp)
239{
240 nfs_fscache_release_client_cookie(clp);
241
242 /* -EIO all pending I/O */
243 if (!IS_ERR(clp->cl_rpcclient))
244 rpc_shutdown_client(clp->cl_rpcclient);
245
246 put_net(clp->cl_net);
247 put_nfs_version(clp->cl_nfs_mod);
248 kfree(clp->cl_hostname);
249 kfree(clp->cl_acceptor);
250 kfree(clp);
251}
252EXPORT_SYMBOL_GPL(nfs_free_client);
253
254/*
255 * Release a reference to a shared client record
256 */
257void nfs_put_client(struct nfs_client *clp)
258{
259 struct nfs_net *nn;
260
261 if (!clp)
262 return;
263
264 nn = net_generic(clp->cl_net, nfs_net_id);
265
266 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
267 list_del(&clp->cl_share_link);
268 nfs_cb_idr_remove_locked(clp);
269 spin_unlock(&nn->nfs_client_lock);
270
271 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
272
273 clp->rpc_ops->free_client(clp);
274 }
275}
276EXPORT_SYMBOL_GPL(nfs_put_client);
277
278/*
279 * Find an nfs_client on the list that matches the initialisation data
280 * that is supplied.
281 */
282static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
283{
284 struct nfs_client *clp;
285 const struct sockaddr *sap = data->addr;
286 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
287 int error;
288
289again:
290 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
291 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
292 /* Don't match clients that failed to initialise properly */
293 if (clp->cl_cons_state < 0)
294 continue;
295
296 /* If a client is still initializing then we need to wait */
297 if (clp->cl_cons_state > NFS_CS_READY) {
298 refcount_inc(&clp->cl_count);
299 spin_unlock(&nn->nfs_client_lock);
300 error = nfs_wait_client_init_complete(clp);
301 nfs_put_client(clp);
302 spin_lock(&nn->nfs_client_lock);
303 if (error < 0)
304 return ERR_PTR(error);
305 goto again;
306 }
307
308 /* Different NFS versions cannot share the same nfs_client */
309 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
310 continue;
311
312 if (clp->cl_proto != data->proto)
313 continue;
314 /* Match nfsv4 minorversion */
315 if (clp->cl_minorversion != data->minorversion)
316 continue;
317
318 /* Match request for a dedicated DS */
319 if (test_bit(NFS_CS_DS, &data->init_flags) !=
320 test_bit(NFS_CS_DS, &clp->cl_flags))
321 continue;
322
323 /* Match the full socket address */
324 if (!rpc_cmp_addr_port(sap, clap))
325 /* Match all xprt_switch full socket addresses */
326 if (IS_ERR(clp->cl_rpcclient) ||
327 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
328 sap))
329 continue;
330
331 refcount_inc(&clp->cl_count);
332 return clp;
333 }
334 return NULL;
335}
336
337/*
338 * Return true if @clp is done initializing, false if still working on it.
339 *
340 * Use nfs_client_init_status to check if it was successful.
341 */
342bool nfs_client_init_is_complete(const struct nfs_client *clp)
343{
344 return clp->cl_cons_state <= NFS_CS_READY;
345}
346EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
347
348/*
349 * Return 0 if @clp was successfully initialized, -errno otherwise.
350 *
351 * This must be called *after* nfs_client_init_is_complete() returns true,
352 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
353 */
354int nfs_client_init_status(const struct nfs_client *clp)
355{
356 /* called without checking nfs_client_init_is_complete */
357 if (clp->cl_cons_state > NFS_CS_READY) {
358 WARN_ON_ONCE(1);
359 return -EINVAL;
360 }
361 return clp->cl_cons_state;
362}
363EXPORT_SYMBOL_GPL(nfs_client_init_status);
364
365int nfs_wait_client_init_complete(const struct nfs_client *clp)
366{
367 return wait_event_killable(nfs_client_active_wq,
368 nfs_client_init_is_complete(clp));
369}
370EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
371
372/*
373 * Found an existing client. Make sure it's ready before returning.
374 */
375static struct nfs_client *
376nfs_found_client(const struct nfs_client_initdata *cl_init,
377 struct nfs_client *clp)
378{
379 int error;
380
381 error = nfs_wait_client_init_complete(clp);
382 if (error < 0) {
383 nfs_put_client(clp);
384 return ERR_PTR(-ERESTARTSYS);
385 }
386
387 if (clp->cl_cons_state < NFS_CS_READY) {
388 error = clp->cl_cons_state;
389 nfs_put_client(clp);
390 return ERR_PTR(error);
391 }
392
393 smp_rmb();
394 return clp;
395}
396
397/*
398 * Look up a client by IP address and protocol version
399 * - creates a new record if one doesn't yet exist
400 */
401struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
402{
403 struct nfs_client *clp, *new = NULL;
404 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
405 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
406
407 if (cl_init->hostname == NULL) {
408 WARN_ON(1);
409 return ERR_PTR(-EINVAL);
410 }
411
412 /* see if the client already exists */
413 do {
414 spin_lock(&nn->nfs_client_lock);
415
416 clp = nfs_match_client(cl_init);
417 if (clp) {
418 spin_unlock(&nn->nfs_client_lock);
419 if (new)
420 new->rpc_ops->free_client(new);
421 if (IS_ERR(clp))
422 return clp;
423 return nfs_found_client(cl_init, clp);
424 }
425 if (new) {
426 list_add_tail(&new->cl_share_link,
427 &nn->nfs_client_list);
428 spin_unlock(&nn->nfs_client_lock);
429 new->cl_flags = cl_init->init_flags;
430 return rpc_ops->init_client(new, cl_init);
431 }
432
433 spin_unlock(&nn->nfs_client_lock);
434
435 new = rpc_ops->alloc_client(cl_init);
436 } while (!IS_ERR(new));
437
438 return new;
439}
440EXPORT_SYMBOL_GPL(nfs_get_client);
441
442/*
443 * Mark a server as ready or failed
444 */
445void nfs_mark_client_ready(struct nfs_client *clp, int state)
446{
447 smp_wmb();
448 clp->cl_cons_state = state;
449 wake_up_all(&nfs_client_active_wq);
450}
451EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
452
453/*
454 * Initialise the timeout values for a connection
455 */
456void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
457 int timeo, int retrans)
458{
459 to->to_initval = timeo * HZ / 10;
460 to->to_retries = retrans;
461
462 switch (proto) {
463 case XPRT_TRANSPORT_TCP:
464 case XPRT_TRANSPORT_RDMA:
465 if (retrans == NFS_UNSPEC_RETRANS)
466 to->to_retries = NFS_DEF_TCP_RETRANS;
467 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
468 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
469 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
470 to->to_initval = NFS_MAX_TCP_TIMEOUT;
471 to->to_increment = to->to_initval;
472 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
473 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
474 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
475 if (to->to_maxval < to->to_initval)
476 to->to_maxval = to->to_initval;
477 to->to_exponential = 0;
478 break;
479 case XPRT_TRANSPORT_UDP:
480 if (retrans == NFS_UNSPEC_RETRANS)
481 to->to_retries = NFS_DEF_UDP_RETRANS;
482 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
483 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
484 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
485 to->to_initval = NFS_MAX_UDP_TIMEOUT;
486 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
487 to->to_exponential = 1;
488 break;
489 default:
490 BUG();
491 }
492}
493EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
494
495/*
496 * Create an RPC client handle
497 */
498int nfs_create_rpc_client(struct nfs_client *clp,
499 const struct nfs_client_initdata *cl_init,
500 rpc_authflavor_t flavor)
501{
502 struct rpc_clnt *clnt = NULL;
503 struct rpc_create_args args = {
504 .net = clp->cl_net,
505 .protocol = clp->cl_proto,
506 .nconnect = clp->cl_nconnect,
507 .address = (struct sockaddr *)&clp->cl_addr,
508 .addrsize = clp->cl_addrlen,
509 .timeout = cl_init->timeparms,
510 .servername = clp->cl_hostname,
511 .nodename = cl_init->nodename,
512 .program = &nfs_program,
513 .version = clp->rpc_ops->version,
514 .authflavor = flavor,
515 .cred = cl_init->cred,
516 };
517
518 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
519 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
520 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
521 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
522 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
523 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
524 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
525 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
526 if (test_bit(NFS_CS_NOPING, &clp->cl_flags))
527 args.flags |= RPC_CLNT_CREATE_NOPING;
528 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags))
529 args.flags |= RPC_CLNT_CREATE_REUSEPORT;
530
531 if (!IS_ERR(clp->cl_rpcclient))
532 return 0;
533
534 clnt = rpc_create(&args);
535 if (IS_ERR(clnt)) {
536 dprintk("%s: cannot create RPC client. Error = %ld\n",
537 __func__, PTR_ERR(clnt));
538 return PTR_ERR(clnt);
539 }
540
541 clnt->cl_principal = clp->cl_principal;
542 clp->cl_rpcclient = clnt;
543 return 0;
544}
545EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
546
547/*
548 * Version 2 or 3 client destruction
549 */
550static void nfs_destroy_server(struct nfs_server *server)
551{
552 if (server->nlm_host)
553 nlmclnt_done(server->nlm_host);
554}
555
556/*
557 * Version 2 or 3 lockd setup
558 */
559static int nfs_start_lockd(struct nfs_server *server)
560{
561 struct nlm_host *host;
562 struct nfs_client *clp = server->nfs_client;
563 struct nlmclnt_initdata nlm_init = {
564 .hostname = clp->cl_hostname,
565 .address = (struct sockaddr *)&clp->cl_addr,
566 .addrlen = clp->cl_addrlen,
567 .nfs_version = clp->rpc_ops->version,
568 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
569 1 : 0,
570 .net = clp->cl_net,
571 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
572 .cred = server->cred,
573 };
574
575 if (nlm_init.nfs_version > 3)
576 return 0;
577 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
578 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
579 return 0;
580
581 switch (clp->cl_proto) {
582 default:
583 nlm_init.protocol = IPPROTO_TCP;
584 break;
585#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
586 case XPRT_TRANSPORT_UDP:
587 nlm_init.protocol = IPPROTO_UDP;
588#endif
589 }
590
591 host = nlmclnt_init(&nlm_init);
592 if (IS_ERR(host))
593 return PTR_ERR(host);
594
595 server->nlm_host = host;
596 server->destroy = nfs_destroy_server;
597 return 0;
598}
599
600/*
601 * Create a general RPC client
602 */
603int nfs_init_server_rpcclient(struct nfs_server *server,
604 const struct rpc_timeout *timeo,
605 rpc_authflavor_t pseudoflavour)
606{
607 struct nfs_client *clp = server->nfs_client;
608
609 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
610 pseudoflavour);
611 if (IS_ERR(server->client)) {
612 dprintk("%s: couldn't create rpc_client!\n", __func__);
613 return PTR_ERR(server->client);
614 }
615
616 memcpy(&server->client->cl_timeout_default,
617 timeo,
618 sizeof(server->client->cl_timeout_default));
619 server->client->cl_timeout = &server->client->cl_timeout_default;
620 server->client->cl_softrtry = 0;
621 if (server->flags & NFS_MOUNT_SOFTERR)
622 server->client->cl_softerr = 1;
623 if (server->flags & NFS_MOUNT_SOFT)
624 server->client->cl_softrtry = 1;
625
626 return 0;
627}
628EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
629
630/**
631 * nfs_init_client - Initialise an NFS2 or NFS3 client
632 *
633 * @clp: nfs_client to initialise
634 * @cl_init: Initialisation parameters
635 *
636 * Returns pointer to an NFS client, or an ERR_PTR value.
637 */
638struct nfs_client *nfs_init_client(struct nfs_client *clp,
639 const struct nfs_client_initdata *cl_init)
640{
641 int error;
642
643 /* the client is already initialised */
644 if (clp->cl_cons_state == NFS_CS_READY)
645 return clp;
646
647 /*
648 * Create a client RPC handle for doing FSSTAT with UNIX auth only
649 * - RFC 2623, sec 2.3.2
650 */
651 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
652 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
653 if (error < 0) {
654 nfs_put_client(clp);
655 clp = ERR_PTR(error);
656 }
657 return clp;
658}
659EXPORT_SYMBOL_GPL(nfs_init_client);
660
661/*
662 * Create a version 2 or 3 client
663 */
664static int nfs_init_server(struct nfs_server *server,
665 const struct fs_context *fc)
666{
667 const struct nfs_fs_context *ctx = nfs_fc2context(fc);
668 struct rpc_timeout timeparms;
669 struct nfs_client_initdata cl_init = {
670 .hostname = ctx->nfs_server.hostname,
671 .addr = (const struct sockaddr *)&ctx->nfs_server.address,
672 .addrlen = ctx->nfs_server.addrlen,
673 .nfs_mod = ctx->nfs_mod,
674 .proto = ctx->nfs_server.protocol,
675 .net = fc->net_ns,
676 .timeparms = &timeparms,
677 .cred = server->cred,
678 .nconnect = ctx->nfs_server.nconnect,
679 .init_flags = (1UL << NFS_CS_REUSEPORT),
680 };
681 struct nfs_client *clp;
682 int error;
683
684 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
685 ctx->timeo, ctx->retrans);
686 if (ctx->flags & NFS_MOUNT_NORESVPORT)
687 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
688
689 /* Allocate or find a client reference we can use */
690 clp = nfs_get_client(&cl_init);
691 if (IS_ERR(clp))
692 return PTR_ERR(clp);
693
694 server->nfs_client = clp;
695
696 /* Initialise the client representation from the mount data */
697 server->flags = ctx->flags;
698 server->options = ctx->options;
699 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS;
700
701 switch (clp->rpc_ops->version) {
702 case 2:
703 server->fattr_valid = NFS_ATTR_FATTR_V2;
704 break;
705 case 3:
706 server->fattr_valid = NFS_ATTR_FATTR_V3;
707 break;
708 default:
709 server->fattr_valid = NFS_ATTR_FATTR_V4;
710 }
711
712 if (ctx->rsize)
713 server->rsize = nfs_block_size(ctx->rsize, NULL);
714 if (ctx->wsize)
715 server->wsize = nfs_block_size(ctx->wsize, NULL);
716
717 server->acregmin = ctx->acregmin * HZ;
718 server->acregmax = ctx->acregmax * HZ;
719 server->acdirmin = ctx->acdirmin * HZ;
720 server->acdirmax = ctx->acdirmax * HZ;
721
722 /* Start lockd here, before we might error out */
723 error = nfs_start_lockd(server);
724 if (error < 0)
725 goto error;
726
727 server->port = ctx->nfs_server.port;
728 server->auth_info = ctx->auth_info;
729
730 error = nfs_init_server_rpcclient(server, &timeparms,
731 ctx->selected_flavor);
732 if (error < 0)
733 goto error;
734
735 /* Preserve the values of mount_server-related mount options */
736 if (ctx->mount_server.addrlen) {
737 memcpy(&server->mountd_address, &ctx->mount_server.address,
738 ctx->mount_server.addrlen);
739 server->mountd_addrlen = ctx->mount_server.addrlen;
740 }
741 server->mountd_version = ctx->mount_server.version;
742 server->mountd_port = ctx->mount_server.port;
743 server->mountd_protocol = ctx->mount_server.protocol;
744
745 server->namelen = ctx->namlen;
746 return 0;
747
748error:
749 server->nfs_client = NULL;
750 nfs_put_client(clp);
751 return error;
752}
753
754/*
755 * Load up the server record from information gained in an fsinfo record
756 */
757static void nfs_server_set_fsinfo(struct nfs_server *server,
758 struct nfs_fsinfo *fsinfo)
759{
760 unsigned long max_rpc_payload, raw_max_rpc_payload;
761
762 /* Work out a lot of parameters */
763 if (server->rsize == 0)
764 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
765 if (server->wsize == 0)
766 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
767
768 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
769 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
770 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
771 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
772
773 raw_max_rpc_payload = rpc_max_payload(server->client);
774 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL);
775
776 if (server->rsize > max_rpc_payload)
777 server->rsize = max_rpc_payload;
778 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
779 server->rsize = NFS_MAX_FILE_IO_SIZE;
780 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
781
782 if (server->wsize > max_rpc_payload)
783 server->wsize = max_rpc_payload;
784 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
785 server->wsize = NFS_MAX_FILE_IO_SIZE;
786 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
787
788 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
789
790 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
791 if (server->dtsize > NFS_MAX_FILE_IO_SIZE)
792 server->dtsize = NFS_MAX_FILE_IO_SIZE;
793 if (server->dtsize > server->rsize)
794 server->dtsize = server->rsize;
795
796 if (server->flags & NFS_MOUNT_NOAC) {
797 server->acregmin = server->acregmax = 0;
798 server->acdirmin = server->acdirmax = 0;
799 }
800
801 server->maxfilesize = fsinfo->maxfilesize;
802
803 server->time_delta = fsinfo->time_delta;
804 server->change_attr_type = fsinfo->change_attr_type;
805
806 server->clone_blksize = fsinfo->clone_blksize;
807 /* We're airborne Set socket buffersize */
808 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
809
810#ifdef CONFIG_NFS_V4_2
811 /*
812 * Defaults until limited by the session parameters.
813 */
814 server->gxasize = min_t(unsigned int, raw_max_rpc_payload,
815 XATTR_SIZE_MAX);
816 server->sxasize = min_t(unsigned int, raw_max_rpc_payload,
817 XATTR_SIZE_MAX);
818 server->lxasize = min_t(unsigned int, raw_max_rpc_payload,
819 nfs42_listxattr_xdrsize(XATTR_LIST_MAX));
820
821 if (fsinfo->xattr_support)
822 server->caps |= NFS_CAP_XATTR;
823#endif
824}
825
826/*
827 * Probe filesystem information, including the FSID on v2/v3
828 */
829int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
830{
831 struct nfs_fsinfo fsinfo;
832 struct nfs_client *clp = server->nfs_client;
833 int error;
834
835 if (clp->rpc_ops->set_capabilities != NULL) {
836 error = clp->rpc_ops->set_capabilities(server, mntfh);
837 if (error < 0)
838 return error;
839 }
840
841 fsinfo.fattr = fattr;
842 fsinfo.nlayouttypes = 0;
843 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
844 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
845 if (error < 0)
846 return error;
847
848 nfs_server_set_fsinfo(server, &fsinfo);
849
850 /* Get some general file system info */
851 if (server->namelen == 0) {
852 struct nfs_pathconf pathinfo;
853
854 pathinfo.fattr = fattr;
855 nfs_fattr_init(fattr);
856
857 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
858 server->namelen = pathinfo.max_namelen;
859 }
860
861 return 0;
862}
863EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
864
865/*
866 * Copy useful information when duplicating a server record
867 */
868void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
869{
870 target->flags = source->flags;
871 target->rsize = source->rsize;
872 target->wsize = source->wsize;
873 target->acregmin = source->acregmin;
874 target->acregmax = source->acregmax;
875 target->acdirmin = source->acdirmin;
876 target->acdirmax = source->acdirmax;
877 target->caps = source->caps;
878 target->options = source->options;
879 target->auth_info = source->auth_info;
880 target->port = source->port;
881}
882EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
883
884void nfs_server_insert_lists(struct nfs_server *server)
885{
886 struct nfs_client *clp = server->nfs_client;
887 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
888
889 spin_lock(&nn->nfs_client_lock);
890 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
891 list_add_tail(&server->master_link, &nn->nfs_volume_list);
892 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
893 spin_unlock(&nn->nfs_client_lock);
894
895}
896EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
897
898void nfs_server_remove_lists(struct nfs_server *server)
899{
900 struct nfs_client *clp = server->nfs_client;
901 struct nfs_net *nn;
902
903 if (clp == NULL)
904 return;
905 nn = net_generic(clp->cl_net, nfs_net_id);
906 spin_lock(&nn->nfs_client_lock);
907 list_del_rcu(&server->client_link);
908 if (list_empty(&clp->cl_superblocks))
909 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
910 list_del(&server->master_link);
911 spin_unlock(&nn->nfs_client_lock);
912
913 synchronize_rcu();
914}
915EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
916
917/*
918 * Allocate and initialise a server record
919 */
920struct nfs_server *nfs_alloc_server(void)
921{
922 struct nfs_server *server;
923
924 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
925 if (!server)
926 return NULL;
927
928 server->client = server->client_acl = ERR_PTR(-EINVAL);
929
930 /* Zero out the NFS state stuff */
931 INIT_LIST_HEAD(&server->client_link);
932 INIT_LIST_HEAD(&server->master_link);
933 INIT_LIST_HEAD(&server->delegations);
934 INIT_LIST_HEAD(&server->layouts);
935 INIT_LIST_HEAD(&server->state_owners_lru);
936 INIT_LIST_HEAD(&server->ss_copies);
937
938 atomic_set(&server->active, 0);
939
940 server->io_stats = nfs_alloc_iostats();
941 if (!server->io_stats) {
942 kfree(server);
943 return NULL;
944 }
945
946 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
947
948 ida_init(&server->openowner_id);
949 ida_init(&server->lockowner_id);
950 pnfs_init_server(server);
951 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
952
953 return server;
954}
955EXPORT_SYMBOL_GPL(nfs_alloc_server);
956
957/*
958 * Free up a server record
959 */
960void nfs_free_server(struct nfs_server *server)
961{
962 nfs_server_remove_lists(server);
963
964 if (server->destroy != NULL)
965 server->destroy(server);
966
967 if (!IS_ERR(server->client_acl))
968 rpc_shutdown_client(server->client_acl);
969 if (!IS_ERR(server->client))
970 rpc_shutdown_client(server->client);
971
972 nfs_put_client(server->nfs_client);
973
974 ida_destroy(&server->lockowner_id);
975 ida_destroy(&server->openowner_id);
976 nfs_free_iostats(server->io_stats);
977 put_cred(server->cred);
978 kfree(server);
979 nfs_release_automount_timer();
980}
981EXPORT_SYMBOL_GPL(nfs_free_server);
982
983/*
984 * Create a version 2 or 3 volume record
985 * - keyed on server and FSID
986 */
987struct nfs_server *nfs_create_server(struct fs_context *fc)
988{
989 struct nfs_fs_context *ctx = nfs_fc2context(fc);
990 struct nfs_server *server;
991 struct nfs_fattr *fattr;
992 int error;
993
994 server = nfs_alloc_server();
995 if (!server)
996 return ERR_PTR(-ENOMEM);
997
998 server->cred = get_cred(fc->cred);
999
1000 error = -ENOMEM;
1001 fattr = nfs_alloc_fattr();
1002 if (fattr == NULL)
1003 goto error;
1004
1005 /* Get a client representation */
1006 error = nfs_init_server(server, fc);
1007 if (error < 0)
1008 goto error;
1009
1010 /* Probe the root fh to retrieve its FSID */
1011 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
1012 if (error < 0)
1013 goto error;
1014 if (server->nfs_client->rpc_ops->version == 3) {
1015 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1016 server->namelen = NFS3_MAXNAMLEN;
1017 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
1018 server->caps |= NFS_CAP_READDIRPLUS;
1019 } else {
1020 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1021 server->namelen = NFS2_MAXNAMLEN;
1022 }
1023
1024 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1025 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh,
1026 fattr, NULL, NULL);
1027 if (error < 0) {
1028 dprintk("nfs_create_server: getattr error = %d\n", -error);
1029 goto error;
1030 }
1031 }
1032 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1033
1034 dprintk("Server FSID: %llx:%llx\n",
1035 (unsigned long long) server->fsid.major,
1036 (unsigned long long) server->fsid.minor);
1037
1038 nfs_server_insert_lists(server);
1039 server->mount_time = jiffies;
1040 nfs_free_fattr(fattr);
1041 return server;
1042
1043error:
1044 nfs_free_fattr(fattr);
1045 nfs_free_server(server);
1046 return ERR_PTR(error);
1047}
1048EXPORT_SYMBOL_GPL(nfs_create_server);
1049
1050/*
1051 * Clone an NFS2, NFS3 or NFS4 server record
1052 */
1053struct nfs_server *nfs_clone_server(struct nfs_server *source,
1054 struct nfs_fh *fh,
1055 struct nfs_fattr *fattr,
1056 rpc_authflavor_t flavor)
1057{
1058 struct nfs_server *server;
1059 struct nfs_fattr *fattr_fsinfo;
1060 int error;
1061
1062 server = nfs_alloc_server();
1063 if (!server)
1064 return ERR_PTR(-ENOMEM);
1065
1066 server->cred = get_cred(source->cred);
1067
1068 error = -ENOMEM;
1069 fattr_fsinfo = nfs_alloc_fattr();
1070 if (fattr_fsinfo == NULL)
1071 goto out_free_server;
1072
1073 /* Copy data from the source */
1074 server->nfs_client = source->nfs_client;
1075 server->destroy = source->destroy;
1076 refcount_inc(&server->nfs_client->cl_count);
1077 nfs_server_copy_userdata(server, source);
1078
1079 server->fsid = fattr->fsid;
1080
1081 error = nfs_init_server_rpcclient(server,
1082 source->client->cl_timeout,
1083 flavor);
1084 if (error < 0)
1085 goto out_free_server;
1086
1087 /* probe the filesystem info for this server filesystem */
1088 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1089 if (error < 0)
1090 goto out_free_server;
1091
1092 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1093 server->namelen = NFS4_MAXNAMLEN;
1094
1095 error = nfs_start_lockd(server);
1096 if (error < 0)
1097 goto out_free_server;
1098
1099 nfs_server_insert_lists(server);
1100 server->mount_time = jiffies;
1101
1102 nfs_free_fattr(fattr_fsinfo);
1103 return server;
1104
1105out_free_server:
1106 nfs_free_fattr(fattr_fsinfo);
1107 nfs_free_server(server);
1108 return ERR_PTR(error);
1109}
1110EXPORT_SYMBOL_GPL(nfs_clone_server);
1111
1112void nfs_clients_init(struct net *net)
1113{
1114 struct nfs_net *nn = net_generic(net, nfs_net_id);
1115
1116 INIT_LIST_HEAD(&nn->nfs_client_list);
1117 INIT_LIST_HEAD(&nn->nfs_volume_list);
1118#if IS_ENABLED(CONFIG_NFS_V4)
1119 idr_init(&nn->cb_ident_idr);
1120#endif
1121 spin_lock_init(&nn->nfs_client_lock);
1122 nn->boot_time = ktime_get_real();
1123
1124 nfs_netns_sysfs_setup(nn, net);
1125}
1126
1127void nfs_clients_exit(struct net *net)
1128{
1129 struct nfs_net *nn = net_generic(net, nfs_net_id);
1130
1131 nfs_netns_sysfs_destroy(nn);
1132 nfs_cleanup_cb_ident_idr(net);
1133 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
1134 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1135}
1136
1137#ifdef CONFIG_PROC_FS
1138static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1139static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1140static void nfs_server_list_stop(struct seq_file *p, void *v);
1141static int nfs_server_list_show(struct seq_file *m, void *v);
1142
1143static const struct seq_operations nfs_server_list_ops = {
1144 .start = nfs_server_list_start,
1145 .next = nfs_server_list_next,
1146 .stop = nfs_server_list_stop,
1147 .show = nfs_server_list_show,
1148};
1149
1150static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1151static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1152static void nfs_volume_list_stop(struct seq_file *p, void *v);
1153static int nfs_volume_list_show(struct seq_file *m, void *v);
1154
1155static const struct seq_operations nfs_volume_list_ops = {
1156 .start = nfs_volume_list_start,
1157 .next = nfs_volume_list_next,
1158 .stop = nfs_volume_list_stop,
1159 .show = nfs_volume_list_show,
1160};
1161
1162/*
1163 * set up the iterator to start reading from the server list and return the first item
1164 */
1165static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1166 __acquires(&nn->nfs_client_lock)
1167{
1168 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1169
1170 /* lock the list against modification */
1171 spin_lock(&nn->nfs_client_lock);
1172 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1173}
1174
1175/*
1176 * move to next server
1177 */
1178static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1179{
1180 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1181
1182 return seq_list_next(v, &nn->nfs_client_list, pos);
1183}
1184
1185/*
1186 * clean up after reading from the transports list
1187 */
1188static void nfs_server_list_stop(struct seq_file *p, void *v)
1189 __releases(&nn->nfs_client_lock)
1190{
1191 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1192
1193 spin_unlock(&nn->nfs_client_lock);
1194}
1195
1196/*
1197 * display a header line followed by a load of call lines
1198 */
1199static int nfs_server_list_show(struct seq_file *m, void *v)
1200{
1201 struct nfs_client *clp;
1202 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1203
1204 /* display header on line 1 */
1205 if (v == &nn->nfs_client_list) {
1206 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1207 return 0;
1208 }
1209
1210 /* display one transport per line on subsequent lines */
1211 clp = list_entry(v, struct nfs_client, cl_share_link);
1212
1213 /* Check if the client is initialized */
1214 if (clp->cl_cons_state != NFS_CS_READY)
1215 return 0;
1216
1217 rcu_read_lock();
1218 seq_printf(m, "v%u %s %s %3d %s\n",
1219 clp->rpc_ops->version,
1220 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1221 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1222 refcount_read(&clp->cl_count),
1223 clp->cl_hostname);
1224 rcu_read_unlock();
1225
1226 return 0;
1227}
1228
1229/*
1230 * set up the iterator to start reading from the volume list and return the first item
1231 */
1232static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1233 __acquires(&nn->nfs_client_lock)
1234{
1235 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1236
1237 /* lock the list against modification */
1238 spin_lock(&nn->nfs_client_lock);
1239 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1240}
1241
1242/*
1243 * move to next volume
1244 */
1245static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1246{
1247 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1248
1249 return seq_list_next(v, &nn->nfs_volume_list, pos);
1250}
1251
1252/*
1253 * clean up after reading from the transports list
1254 */
1255static void nfs_volume_list_stop(struct seq_file *p, void *v)
1256 __releases(&nn->nfs_client_lock)
1257{
1258 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1259
1260 spin_unlock(&nn->nfs_client_lock);
1261}
1262
1263/*
1264 * display a header line followed by a load of call lines
1265 */
1266static int nfs_volume_list_show(struct seq_file *m, void *v)
1267{
1268 struct nfs_server *server;
1269 struct nfs_client *clp;
1270 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1271 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1272 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1273
1274 /* display header on line 1 */
1275 if (v == &nn->nfs_volume_list) {
1276 seq_puts(m, "NV SERVER PORT DEV FSID"
1277 " FSC\n");
1278 return 0;
1279 }
1280 /* display one transport per line on subsequent lines */
1281 server = list_entry(v, struct nfs_server, master_link);
1282 clp = server->nfs_client;
1283
1284 snprintf(dev, sizeof(dev), "%u:%u",
1285 MAJOR(server->s_dev), MINOR(server->s_dev));
1286
1287 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1288 (unsigned long long) server->fsid.major,
1289 (unsigned long long) server->fsid.minor);
1290
1291 rcu_read_lock();
1292 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1293 clp->rpc_ops->version,
1294 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1295 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1296 dev,
1297 fsid,
1298 nfs_server_fscache_state(server));
1299 rcu_read_unlock();
1300
1301 return 0;
1302}
1303
1304int nfs_fs_proc_net_init(struct net *net)
1305{
1306 struct nfs_net *nn = net_generic(net, nfs_net_id);
1307 struct proc_dir_entry *p;
1308
1309 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1310 if (!nn->proc_nfsfs)
1311 goto error_0;
1312
1313 /* a file of servers with which we're dealing */
1314 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1315 &nfs_server_list_ops, sizeof(struct seq_net_private));
1316 if (!p)
1317 goto error_1;
1318
1319 /* a file of volumes that we have mounted */
1320 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1321 &nfs_volume_list_ops, sizeof(struct seq_net_private));
1322 if (!p)
1323 goto error_1;
1324 return 0;
1325
1326error_1:
1327 remove_proc_subtree("nfsfs", net->proc_net);
1328error_0:
1329 return -ENOMEM;
1330}
1331
1332void nfs_fs_proc_net_exit(struct net *net)
1333{
1334 remove_proc_subtree("nfsfs", net->proc_net);
1335}
1336
1337/*
1338 * initialise the /proc/fs/nfsfs/ directory
1339 */
1340int __init nfs_fs_proc_init(void)
1341{
1342 if (!proc_mkdir("fs/nfsfs", NULL))
1343 goto error_0;
1344
1345 /* a file of servers with which we're dealing */
1346 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1347 goto error_1;
1348
1349 /* a file of volumes that we have mounted */
1350 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1351 goto error_1;
1352
1353 return 0;
1354error_1:
1355 remove_proc_subtree("fs/nfsfs", NULL);
1356error_0:
1357 return -ENOMEM;
1358}
1359
1360/*
1361 * clean up the /proc/fs/nfsfs/ directory
1362 */
1363void nfs_fs_proc_exit(void)
1364{
1365 remove_proc_subtree("fs/nfsfs", NULL);
1366}
1367
1368#endif /* CONFIG_PROC_FS */