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1/* client.c: NFS client sharing and management code
2 *
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12
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
57#define NFSDBG_FACILITY NFSDBG_CLIENT
58
59static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
60static DEFINE_SPINLOCK(nfs_version_lock);
61static DEFINE_MUTEX(nfs_version_mutex);
62static LIST_HEAD(nfs_versions);
63
64/*
65 * RPC cruft for NFS
66 */
67static const struct rpc_version *nfs_version[5] = {
68 [2] = NULL,
69 [3] = NULL,
70 [4] = NULL,
71};
72
73const struct rpc_program nfs_program = {
74 .name = "nfs",
75 .number = NFS_PROGRAM,
76 .nrvers = ARRAY_SIZE(nfs_version),
77 .version = nfs_version,
78 .stats = &nfs_rpcstat,
79 .pipe_dir_name = NFS_PIPE_DIRNAME,
80};
81
82struct rpc_stat nfs_rpcstat = {
83 .program = &nfs_program
84};
85
86static struct nfs_subversion *find_nfs_version(unsigned int version)
87{
88 struct nfs_subversion *nfs;
89 spin_lock(&nfs_version_lock);
90
91 list_for_each_entry(nfs, &nfs_versions, list) {
92 if (nfs->rpc_ops->version == version) {
93 spin_unlock(&nfs_version_lock);
94 return nfs;
95 }
96 }
97
98 spin_unlock(&nfs_version_lock);
99 return ERR_PTR(-EPROTONOSUPPORT);
100}
101
102struct nfs_subversion *get_nfs_version(unsigned int version)
103{
104 struct nfs_subversion *nfs = find_nfs_version(version);
105
106 if (IS_ERR(nfs)) {
107 mutex_lock(&nfs_version_mutex);
108 request_module("nfsv%d", version);
109 nfs = find_nfs_version(version);
110 mutex_unlock(&nfs_version_mutex);
111 }
112
113 if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
114 return ERR_PTR(-EAGAIN);
115 return nfs;
116}
117
118void put_nfs_version(struct nfs_subversion *nfs)
119{
120 module_put(nfs->owner);
121}
122
123void register_nfs_version(struct nfs_subversion *nfs)
124{
125 spin_lock(&nfs_version_lock);
126
127 list_add(&nfs->list, &nfs_versions);
128 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
129
130 spin_unlock(&nfs_version_lock);
131}
132EXPORT_SYMBOL_GPL(register_nfs_version);
133
134void unregister_nfs_version(struct nfs_subversion *nfs)
135{
136 spin_lock(&nfs_version_lock);
137
138 nfs_version[nfs->rpc_ops->version] = NULL;
139 list_del(&nfs->list);
140
141 spin_unlock(&nfs_version_lock);
142}
143EXPORT_SYMBOL_GPL(unregister_nfs_version);
144
145/*
146 * Allocate a shared client record
147 *
148 * Since these are allocated/deallocated very rarely, we don't
149 * bother putting them in a slab cache...
150 */
151struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
152{
153 struct nfs_client *clp;
154 struct rpc_cred *cred;
155 int err = -ENOMEM;
156
157 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
158 goto error_0;
159
160 clp->cl_nfs_mod = cl_init->nfs_mod;
161 if (!try_module_get(clp->cl_nfs_mod->owner))
162 goto error_dealloc;
163
164 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
165
166 refcount_set(&clp->cl_count, 1);
167 clp->cl_cons_state = NFS_CS_INITING;
168
169 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
170 clp->cl_addrlen = cl_init->addrlen;
171
172 if (cl_init->hostname) {
173 err = -ENOMEM;
174 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
175 if (!clp->cl_hostname)
176 goto error_cleanup;
177 }
178
179 INIT_LIST_HEAD(&clp->cl_superblocks);
180 clp->cl_rpcclient = ERR_PTR(-EINVAL);
181
182 clp->cl_proto = cl_init->proto;
183 clp->cl_net = get_net(cl_init->net);
184
185 cred = rpc_lookup_machine_cred("*");
186 if (!IS_ERR(cred))
187 clp->cl_machine_cred = cred;
188 nfs_fscache_get_client_cookie(clp);
189
190 return clp;
191
192error_cleanup:
193 put_nfs_version(clp->cl_nfs_mod);
194error_dealloc:
195 kfree(clp);
196error_0:
197 return ERR_PTR(err);
198}
199EXPORT_SYMBOL_GPL(nfs_alloc_client);
200
201#if IS_ENABLED(CONFIG_NFS_V4)
202void nfs_cleanup_cb_ident_idr(struct net *net)
203{
204 struct nfs_net *nn = net_generic(net, nfs_net_id);
205
206 idr_destroy(&nn->cb_ident_idr);
207}
208
209/* nfs_client_lock held */
210static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
211{
212 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
213
214 if (clp->cl_cb_ident)
215 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
216}
217
218static void pnfs_init_server(struct nfs_server *server)
219{
220 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
221}
222
223#else
224void nfs_cleanup_cb_ident_idr(struct net *net)
225{
226}
227
228static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
229{
230}
231
232static void pnfs_init_server(struct nfs_server *server)
233{
234}
235
236#endif /* CONFIG_NFS_V4 */
237
238/*
239 * Destroy a shared client record
240 */
241void nfs_free_client(struct nfs_client *clp)
242{
243 nfs_fscache_release_client_cookie(clp);
244
245 /* -EIO all pending I/O */
246 if (!IS_ERR(clp->cl_rpcclient))
247 rpc_shutdown_client(clp->cl_rpcclient);
248
249 if (clp->cl_machine_cred != NULL)
250 put_rpccred(clp->cl_machine_cred);
251
252 put_net(clp->cl_net);
253 put_nfs_version(clp->cl_nfs_mod);
254 kfree(clp->cl_hostname);
255 kfree(clp->cl_acceptor);
256 kfree(clp);
257}
258EXPORT_SYMBOL_GPL(nfs_free_client);
259
260/*
261 * Release a reference to a shared client record
262 */
263void nfs_put_client(struct nfs_client *clp)
264{
265 struct nfs_net *nn;
266
267 if (!clp)
268 return;
269
270 nn = net_generic(clp->cl_net, nfs_net_id);
271
272 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
273 list_del(&clp->cl_share_link);
274 nfs_cb_idr_remove_locked(clp);
275 spin_unlock(&nn->nfs_client_lock);
276
277 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
278
279 clp->rpc_ops->free_client(clp);
280 }
281}
282EXPORT_SYMBOL_GPL(nfs_put_client);
283
284/*
285 * Find an nfs_client on the list that matches the initialisation data
286 * that is supplied.
287 */
288static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
289{
290 struct nfs_client *clp;
291 const struct sockaddr *sap = data->addr;
292 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
293
294again:
295 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
296 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
297 /* Don't match clients that failed to initialise properly */
298 if (clp->cl_cons_state < 0)
299 continue;
300
301 /* If a client is still initializing then we need to wait */
302 if (clp->cl_cons_state > NFS_CS_READY) {
303 refcount_inc(&clp->cl_count);
304 spin_unlock(&nn->nfs_client_lock);
305 nfs_wait_client_init_complete(clp);
306 nfs_put_client(clp);
307 spin_lock(&nn->nfs_client_lock);
308 goto again;
309 }
310
311 /* Different NFS versions cannot share the same nfs_client */
312 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
313 continue;
314
315 if (clp->cl_proto != data->proto)
316 continue;
317 /* Match nfsv4 minorversion */
318 if (clp->cl_minorversion != data->minorversion)
319 continue;
320 /* Match the full socket address */
321 if (!rpc_cmp_addr_port(sap, clap))
322 /* Match all xprt_switch full socket addresses */
323 if (IS_ERR(clp->cl_rpcclient) ||
324 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
325 sap))
326 continue;
327
328 refcount_inc(&clp->cl_count);
329 return clp;
330 }
331 return NULL;
332}
333
334/*
335 * Return true if @clp is done initializing, false if still working on it.
336 *
337 * Use nfs_client_init_status to check if it was successful.
338 */
339bool nfs_client_init_is_complete(const struct nfs_client *clp)
340{
341 return clp->cl_cons_state <= NFS_CS_READY;
342}
343EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
344
345/*
346 * Return 0 if @clp was successfully initialized, -errno otherwise.
347 *
348 * This must be called *after* nfs_client_init_is_complete() returns true,
349 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
350 */
351int nfs_client_init_status(const struct nfs_client *clp)
352{
353 /* called without checking nfs_client_init_is_complete */
354 if (clp->cl_cons_state > NFS_CS_READY) {
355 WARN_ON_ONCE(1);
356 return -EINVAL;
357 }
358 return clp->cl_cons_state;
359}
360EXPORT_SYMBOL_GPL(nfs_client_init_status);
361
362int nfs_wait_client_init_complete(const struct nfs_client *clp)
363{
364 return wait_event_killable(nfs_client_active_wq,
365 nfs_client_init_is_complete(clp));
366}
367EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
368
369/*
370 * Found an existing client. Make sure it's ready before returning.
371 */
372static struct nfs_client *
373nfs_found_client(const struct nfs_client_initdata *cl_init,
374 struct nfs_client *clp)
375{
376 int error;
377
378 error = nfs_wait_client_init_complete(clp);
379 if (error < 0) {
380 nfs_put_client(clp);
381 return ERR_PTR(-ERESTARTSYS);
382 }
383
384 if (clp->cl_cons_state < NFS_CS_READY) {
385 error = clp->cl_cons_state;
386 nfs_put_client(clp);
387 return ERR_PTR(error);
388 }
389
390 smp_rmb();
391 return clp;
392}
393
394/*
395 * Look up a client by IP address and protocol version
396 * - creates a new record if one doesn't yet exist
397 */
398struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
399{
400 struct nfs_client *clp, *new = NULL;
401 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
402 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
403
404 if (cl_init->hostname == NULL) {
405 WARN_ON(1);
406 return NULL;
407 }
408
409 /* see if the client already exists */
410 do {
411 spin_lock(&nn->nfs_client_lock);
412
413 clp = nfs_match_client(cl_init);
414 if (clp) {
415 spin_unlock(&nn->nfs_client_lock);
416 if (new)
417 new->rpc_ops->free_client(new);
418 return nfs_found_client(cl_init, clp);
419 }
420 if (new) {
421 list_add_tail(&new->cl_share_link,
422 &nn->nfs_client_list);
423 spin_unlock(&nn->nfs_client_lock);
424 new->cl_flags = cl_init->init_flags;
425 return rpc_ops->init_client(new, cl_init);
426 }
427
428 spin_unlock(&nn->nfs_client_lock);
429
430 new = rpc_ops->alloc_client(cl_init);
431 } while (!IS_ERR(new));
432
433 return new;
434}
435EXPORT_SYMBOL_GPL(nfs_get_client);
436
437/*
438 * Mark a server as ready or failed
439 */
440void nfs_mark_client_ready(struct nfs_client *clp, int state)
441{
442 smp_wmb();
443 clp->cl_cons_state = state;
444 wake_up_all(&nfs_client_active_wq);
445}
446EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
447
448/*
449 * Initialise the timeout values for a connection
450 */
451void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
452 int timeo, int retrans)
453{
454 to->to_initval = timeo * HZ / 10;
455 to->to_retries = retrans;
456
457 switch (proto) {
458 case XPRT_TRANSPORT_TCP:
459 case XPRT_TRANSPORT_RDMA:
460 if (retrans == NFS_UNSPEC_RETRANS)
461 to->to_retries = NFS_DEF_TCP_RETRANS;
462 if (timeo == NFS_UNSPEC_TIMEO || to->to_retries == 0)
463 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
464 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
465 to->to_initval = NFS_MAX_TCP_TIMEOUT;
466 to->to_increment = to->to_initval;
467 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
468 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
469 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
470 if (to->to_maxval < to->to_initval)
471 to->to_maxval = to->to_initval;
472 to->to_exponential = 0;
473 break;
474 case XPRT_TRANSPORT_UDP:
475 if (retrans == NFS_UNSPEC_RETRANS)
476 to->to_retries = NFS_DEF_UDP_RETRANS;
477 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
478 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
479 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
480 to->to_initval = NFS_MAX_UDP_TIMEOUT;
481 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
482 to->to_exponential = 1;
483 break;
484 default:
485 BUG();
486 }
487}
488EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
489
490/*
491 * Create an RPC client handle
492 */
493int nfs_create_rpc_client(struct nfs_client *clp,
494 const struct nfs_client_initdata *cl_init,
495 rpc_authflavor_t flavor)
496{
497 struct rpc_clnt *clnt = NULL;
498 struct rpc_create_args args = {
499 .net = clp->cl_net,
500 .protocol = clp->cl_proto,
501 .address = (struct sockaddr *)&clp->cl_addr,
502 .addrsize = clp->cl_addrlen,
503 .timeout = cl_init->timeparms,
504 .servername = clp->cl_hostname,
505 .nodename = cl_init->nodename,
506 .program = &nfs_program,
507 .version = clp->rpc_ops->version,
508 .authflavor = flavor,
509 };
510
511 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
512 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
513 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
514 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
515 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
516 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
517 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
518 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
519
520 if (!IS_ERR(clp->cl_rpcclient))
521 return 0;
522
523 clnt = rpc_create(&args);
524 if (IS_ERR(clnt)) {
525 dprintk("%s: cannot create RPC client. Error = %ld\n",
526 __func__, PTR_ERR(clnt));
527 return PTR_ERR(clnt);
528 }
529
530 clp->cl_rpcclient = clnt;
531 return 0;
532}
533EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
534
535/*
536 * Version 2 or 3 client destruction
537 */
538static void nfs_destroy_server(struct nfs_server *server)
539{
540 if (server->nlm_host)
541 nlmclnt_done(server->nlm_host);
542}
543
544/*
545 * Version 2 or 3 lockd setup
546 */
547static int nfs_start_lockd(struct nfs_server *server)
548{
549 struct nlm_host *host;
550 struct nfs_client *clp = server->nfs_client;
551 struct nlmclnt_initdata nlm_init = {
552 .hostname = clp->cl_hostname,
553 .address = (struct sockaddr *)&clp->cl_addr,
554 .addrlen = clp->cl_addrlen,
555 .nfs_version = clp->rpc_ops->version,
556 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
557 1 : 0,
558 .net = clp->cl_net,
559 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
560 };
561
562 if (nlm_init.nfs_version > 3)
563 return 0;
564 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
565 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
566 return 0;
567
568 switch (clp->cl_proto) {
569 default:
570 nlm_init.protocol = IPPROTO_TCP;
571 break;
572 case XPRT_TRANSPORT_UDP:
573 nlm_init.protocol = IPPROTO_UDP;
574 }
575
576 host = nlmclnt_init(&nlm_init);
577 if (IS_ERR(host))
578 return PTR_ERR(host);
579
580 server->nlm_host = host;
581 server->destroy = nfs_destroy_server;
582 return 0;
583}
584
585/*
586 * Create a general RPC client
587 */
588int nfs_init_server_rpcclient(struct nfs_server *server,
589 const struct rpc_timeout *timeo,
590 rpc_authflavor_t pseudoflavour)
591{
592 struct nfs_client *clp = server->nfs_client;
593
594 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
595 pseudoflavour);
596 if (IS_ERR(server->client)) {
597 dprintk("%s: couldn't create rpc_client!\n", __func__);
598 return PTR_ERR(server->client);
599 }
600
601 memcpy(&server->client->cl_timeout_default,
602 timeo,
603 sizeof(server->client->cl_timeout_default));
604 server->client->cl_timeout = &server->client->cl_timeout_default;
605 server->client->cl_softrtry = 0;
606 if (server->flags & NFS_MOUNT_SOFT)
607 server->client->cl_softrtry = 1;
608
609 return 0;
610}
611EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
612
613/**
614 * nfs_init_client - Initialise an NFS2 or NFS3 client
615 *
616 * @clp: nfs_client to initialise
617 * @cl_init: Initialisation parameters
618 *
619 * Returns pointer to an NFS client, or an ERR_PTR value.
620 */
621struct nfs_client *nfs_init_client(struct nfs_client *clp,
622 const struct nfs_client_initdata *cl_init)
623{
624 int error;
625
626 /* the client is already initialised */
627 if (clp->cl_cons_state == NFS_CS_READY)
628 return clp;
629
630 /*
631 * Create a client RPC handle for doing FSSTAT with UNIX auth only
632 * - RFC 2623, sec 2.3.2
633 */
634 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
635 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
636 if (error < 0) {
637 nfs_put_client(clp);
638 clp = ERR_PTR(error);
639 }
640 return clp;
641}
642EXPORT_SYMBOL_GPL(nfs_init_client);
643
644/*
645 * Create a version 2 or 3 client
646 */
647static int nfs_init_server(struct nfs_server *server,
648 const struct nfs_parsed_mount_data *data,
649 struct nfs_subversion *nfs_mod)
650{
651 struct rpc_timeout timeparms;
652 struct nfs_client_initdata cl_init = {
653 .hostname = data->nfs_server.hostname,
654 .addr = (const struct sockaddr *)&data->nfs_server.address,
655 .addrlen = data->nfs_server.addrlen,
656 .nfs_mod = nfs_mod,
657 .proto = data->nfs_server.protocol,
658 .net = data->net,
659 .timeparms = &timeparms,
660 };
661 struct nfs_client *clp;
662 int error;
663
664 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
665 data->timeo, data->retrans);
666 if (data->flags & NFS_MOUNT_NORESVPORT)
667 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
668
669 /* Allocate or find a client reference we can use */
670 clp = nfs_get_client(&cl_init);
671 if (IS_ERR(clp))
672 return PTR_ERR(clp);
673
674 server->nfs_client = clp;
675
676 /* Initialise the client representation from the mount data */
677 server->flags = data->flags;
678 server->options = data->options;
679 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
680 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
681 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
682
683 if (data->rsize)
684 server->rsize = nfs_block_size(data->rsize, NULL);
685 if (data->wsize)
686 server->wsize = nfs_block_size(data->wsize, NULL);
687
688 server->acregmin = data->acregmin * HZ;
689 server->acregmax = data->acregmax * HZ;
690 server->acdirmin = data->acdirmin * HZ;
691 server->acdirmax = data->acdirmax * HZ;
692
693 /* Start lockd here, before we might error out */
694 error = nfs_start_lockd(server);
695 if (error < 0)
696 goto error;
697
698 server->port = data->nfs_server.port;
699 server->auth_info = data->auth_info;
700
701 error = nfs_init_server_rpcclient(server, &timeparms,
702 data->selected_flavor);
703 if (error < 0)
704 goto error;
705
706 /* Preserve the values of mount_server-related mount options */
707 if (data->mount_server.addrlen) {
708 memcpy(&server->mountd_address, &data->mount_server.address,
709 data->mount_server.addrlen);
710 server->mountd_addrlen = data->mount_server.addrlen;
711 }
712 server->mountd_version = data->mount_server.version;
713 server->mountd_port = data->mount_server.port;
714 server->mountd_protocol = data->mount_server.protocol;
715
716 server->namelen = data->namlen;
717 return 0;
718
719error:
720 server->nfs_client = NULL;
721 nfs_put_client(clp);
722 return error;
723}
724
725/*
726 * Load up the server record from information gained in an fsinfo record
727 */
728static void nfs_server_set_fsinfo(struct nfs_server *server,
729 struct nfs_fsinfo *fsinfo)
730{
731 unsigned long max_rpc_payload;
732
733 /* Work out a lot of parameters */
734 if (server->rsize == 0)
735 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
736 if (server->wsize == 0)
737 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
738
739 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
740 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
741 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
742 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
743
744 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
745 if (server->rsize > max_rpc_payload)
746 server->rsize = max_rpc_payload;
747 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
748 server->rsize = NFS_MAX_FILE_IO_SIZE;
749 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
750
751 if (server->wsize > max_rpc_payload)
752 server->wsize = max_rpc_payload;
753 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
754 server->wsize = NFS_MAX_FILE_IO_SIZE;
755 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
756
757 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
758
759 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
760 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES)
761 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES;
762 if (server->dtsize > server->rsize)
763 server->dtsize = server->rsize;
764
765 if (server->flags & NFS_MOUNT_NOAC) {
766 server->acregmin = server->acregmax = 0;
767 server->acdirmin = server->acdirmax = 0;
768 }
769
770 server->maxfilesize = fsinfo->maxfilesize;
771
772 server->time_delta = fsinfo->time_delta;
773
774 server->clone_blksize = fsinfo->clone_blksize;
775 /* We're airborne Set socket buffersize */
776 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
777}
778
779/*
780 * Probe filesystem information, including the FSID on v2/v3
781 */
782int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
783{
784 struct nfs_fsinfo fsinfo;
785 struct nfs_client *clp = server->nfs_client;
786 int error;
787
788 if (clp->rpc_ops->set_capabilities != NULL) {
789 error = clp->rpc_ops->set_capabilities(server, mntfh);
790 if (error < 0)
791 return error;
792 }
793
794 fsinfo.fattr = fattr;
795 fsinfo.nlayouttypes = 0;
796 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
797 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
798 if (error < 0)
799 return error;
800
801 nfs_server_set_fsinfo(server, &fsinfo);
802
803 /* Get some general file system info */
804 if (server->namelen == 0) {
805 struct nfs_pathconf pathinfo;
806
807 pathinfo.fattr = fattr;
808 nfs_fattr_init(fattr);
809
810 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
811 server->namelen = pathinfo.max_namelen;
812 }
813
814 return 0;
815}
816EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
817
818/*
819 * Copy useful information when duplicating a server record
820 */
821void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
822{
823 target->flags = source->flags;
824 target->rsize = source->rsize;
825 target->wsize = source->wsize;
826 target->acregmin = source->acregmin;
827 target->acregmax = source->acregmax;
828 target->acdirmin = source->acdirmin;
829 target->acdirmax = source->acdirmax;
830 target->caps = source->caps;
831 target->options = source->options;
832 target->auth_info = source->auth_info;
833 target->port = source->port;
834}
835EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
836
837void nfs_server_insert_lists(struct nfs_server *server)
838{
839 struct nfs_client *clp = server->nfs_client;
840 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
841
842 spin_lock(&nn->nfs_client_lock);
843 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
844 list_add_tail(&server->master_link, &nn->nfs_volume_list);
845 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
846 spin_unlock(&nn->nfs_client_lock);
847
848}
849EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
850
851void nfs_server_remove_lists(struct nfs_server *server)
852{
853 struct nfs_client *clp = server->nfs_client;
854 struct nfs_net *nn;
855
856 if (clp == NULL)
857 return;
858 nn = net_generic(clp->cl_net, nfs_net_id);
859 spin_lock(&nn->nfs_client_lock);
860 list_del_rcu(&server->client_link);
861 if (list_empty(&clp->cl_superblocks))
862 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
863 list_del(&server->master_link);
864 spin_unlock(&nn->nfs_client_lock);
865
866 synchronize_rcu();
867}
868EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
869
870/*
871 * Allocate and initialise a server record
872 */
873struct nfs_server *nfs_alloc_server(void)
874{
875 struct nfs_server *server;
876
877 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
878 if (!server)
879 return NULL;
880
881 server->client = server->client_acl = ERR_PTR(-EINVAL);
882
883 /* Zero out the NFS state stuff */
884 INIT_LIST_HEAD(&server->client_link);
885 INIT_LIST_HEAD(&server->master_link);
886 INIT_LIST_HEAD(&server->delegations);
887 INIT_LIST_HEAD(&server->layouts);
888 INIT_LIST_HEAD(&server->state_owners_lru);
889
890 atomic_set(&server->active, 0);
891
892 server->io_stats = nfs_alloc_iostats();
893 if (!server->io_stats) {
894 kfree(server);
895 return NULL;
896 }
897
898 ida_init(&server->openowner_id);
899 ida_init(&server->lockowner_id);
900 pnfs_init_server(server);
901 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
902
903 return server;
904}
905EXPORT_SYMBOL_GPL(nfs_alloc_server);
906
907/*
908 * Free up a server record
909 */
910void nfs_free_server(struct nfs_server *server)
911{
912 nfs_server_remove_lists(server);
913
914 if (server->destroy != NULL)
915 server->destroy(server);
916
917 if (!IS_ERR(server->client_acl))
918 rpc_shutdown_client(server->client_acl);
919 if (!IS_ERR(server->client))
920 rpc_shutdown_client(server->client);
921
922 nfs_put_client(server->nfs_client);
923
924 ida_destroy(&server->lockowner_id);
925 ida_destroy(&server->openowner_id);
926 nfs_free_iostats(server->io_stats);
927 kfree(server);
928 nfs_release_automount_timer();
929}
930EXPORT_SYMBOL_GPL(nfs_free_server);
931
932/*
933 * Create a version 2 or 3 volume record
934 * - keyed on server and FSID
935 */
936struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
937 struct nfs_subversion *nfs_mod)
938{
939 struct nfs_server *server;
940 struct nfs_fattr *fattr;
941 int error;
942
943 server = nfs_alloc_server();
944 if (!server)
945 return ERR_PTR(-ENOMEM);
946
947 error = -ENOMEM;
948 fattr = nfs_alloc_fattr();
949 if (fattr == NULL)
950 goto error;
951
952 /* Get a client representation */
953 error = nfs_init_server(server, mount_info->parsed, nfs_mod);
954 if (error < 0)
955 goto error;
956
957 /* Probe the root fh to retrieve its FSID */
958 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
959 if (error < 0)
960 goto error;
961 if (server->nfs_client->rpc_ops->version == 3) {
962 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
963 server->namelen = NFS3_MAXNAMLEN;
964 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
965 server->caps |= NFS_CAP_READDIRPLUS;
966 } else {
967 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
968 server->namelen = NFS2_MAXNAMLEN;
969 }
970
971 if (!(fattr->valid & NFS_ATTR_FATTR)) {
972 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
973 if (error < 0) {
974 dprintk("nfs_create_server: getattr error = %d\n", -error);
975 goto error;
976 }
977 }
978 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
979
980 dprintk("Server FSID: %llx:%llx\n",
981 (unsigned long long) server->fsid.major,
982 (unsigned long long) server->fsid.minor);
983
984 nfs_server_insert_lists(server);
985 server->mount_time = jiffies;
986 nfs_free_fattr(fattr);
987 return server;
988
989error:
990 nfs_free_fattr(fattr);
991 nfs_free_server(server);
992 return ERR_PTR(error);
993}
994EXPORT_SYMBOL_GPL(nfs_create_server);
995
996/*
997 * Clone an NFS2, NFS3 or NFS4 server record
998 */
999struct nfs_server *nfs_clone_server(struct nfs_server *source,
1000 struct nfs_fh *fh,
1001 struct nfs_fattr *fattr,
1002 rpc_authflavor_t flavor)
1003{
1004 struct nfs_server *server;
1005 struct nfs_fattr *fattr_fsinfo;
1006 int error;
1007
1008 server = nfs_alloc_server();
1009 if (!server)
1010 return ERR_PTR(-ENOMEM);
1011
1012 error = -ENOMEM;
1013 fattr_fsinfo = nfs_alloc_fattr();
1014 if (fattr_fsinfo == NULL)
1015 goto out_free_server;
1016
1017 /* Copy data from the source */
1018 server->nfs_client = source->nfs_client;
1019 server->destroy = source->destroy;
1020 refcount_inc(&server->nfs_client->cl_count);
1021 nfs_server_copy_userdata(server, source);
1022
1023 server->fsid = fattr->fsid;
1024
1025 error = nfs_init_server_rpcclient(server,
1026 source->client->cl_timeout,
1027 flavor);
1028 if (error < 0)
1029 goto out_free_server;
1030
1031 /* probe the filesystem info for this server filesystem */
1032 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1033 if (error < 0)
1034 goto out_free_server;
1035
1036 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1037 server->namelen = NFS4_MAXNAMLEN;
1038
1039 error = nfs_start_lockd(server);
1040 if (error < 0)
1041 goto out_free_server;
1042
1043 nfs_server_insert_lists(server);
1044 server->mount_time = jiffies;
1045
1046 nfs_free_fattr(fattr_fsinfo);
1047 return server;
1048
1049out_free_server:
1050 nfs_free_fattr(fattr_fsinfo);
1051 nfs_free_server(server);
1052 return ERR_PTR(error);
1053}
1054EXPORT_SYMBOL_GPL(nfs_clone_server);
1055
1056void nfs_clients_init(struct net *net)
1057{
1058 struct nfs_net *nn = net_generic(net, nfs_net_id);
1059
1060 INIT_LIST_HEAD(&nn->nfs_client_list);
1061 INIT_LIST_HEAD(&nn->nfs_volume_list);
1062#if IS_ENABLED(CONFIG_NFS_V4)
1063 idr_init(&nn->cb_ident_idr);
1064#endif
1065 spin_lock_init(&nn->nfs_client_lock);
1066 nn->boot_time = ktime_get_real();
1067}
1068
1069#ifdef CONFIG_PROC_FS
1070static int nfs_server_list_open(struct inode *inode, struct file *file);
1071static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1072static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1073static void nfs_server_list_stop(struct seq_file *p, void *v);
1074static int nfs_server_list_show(struct seq_file *m, void *v);
1075
1076static const struct seq_operations nfs_server_list_ops = {
1077 .start = nfs_server_list_start,
1078 .next = nfs_server_list_next,
1079 .stop = nfs_server_list_stop,
1080 .show = nfs_server_list_show,
1081};
1082
1083static const struct file_operations nfs_server_list_fops = {
1084 .open = nfs_server_list_open,
1085 .read = seq_read,
1086 .llseek = seq_lseek,
1087 .release = seq_release_net,
1088};
1089
1090static int nfs_volume_list_open(struct inode *inode, struct file *file);
1091static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1092static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1093static void nfs_volume_list_stop(struct seq_file *p, void *v);
1094static int nfs_volume_list_show(struct seq_file *m, void *v);
1095
1096static const struct seq_operations nfs_volume_list_ops = {
1097 .start = nfs_volume_list_start,
1098 .next = nfs_volume_list_next,
1099 .stop = nfs_volume_list_stop,
1100 .show = nfs_volume_list_show,
1101};
1102
1103static const struct file_operations nfs_volume_list_fops = {
1104 .open = nfs_volume_list_open,
1105 .read = seq_read,
1106 .llseek = seq_lseek,
1107 .release = seq_release_net,
1108};
1109
1110/*
1111 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1112 * we're dealing
1113 */
1114static int nfs_server_list_open(struct inode *inode, struct file *file)
1115{
1116 return seq_open_net(inode, file, &nfs_server_list_ops,
1117 sizeof(struct seq_net_private));
1118}
1119
1120/*
1121 * set up the iterator to start reading from the server list and return the first item
1122 */
1123static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1124 __acquires(&nn->nfs_client_lock)
1125{
1126 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1127
1128 /* lock the list against modification */
1129 spin_lock(&nn->nfs_client_lock);
1130 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1131}
1132
1133/*
1134 * move to next server
1135 */
1136static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1137{
1138 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1139
1140 return seq_list_next(v, &nn->nfs_client_list, pos);
1141}
1142
1143/*
1144 * clean up after reading from the transports list
1145 */
1146static void nfs_server_list_stop(struct seq_file *p, void *v)
1147 __releases(&nn->nfs_client_lock)
1148{
1149 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1150
1151 spin_unlock(&nn->nfs_client_lock);
1152}
1153
1154/*
1155 * display a header line followed by a load of call lines
1156 */
1157static int nfs_server_list_show(struct seq_file *m, void *v)
1158{
1159 struct nfs_client *clp;
1160 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1161
1162 /* display header on line 1 */
1163 if (v == &nn->nfs_client_list) {
1164 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1165 return 0;
1166 }
1167
1168 /* display one transport per line on subsequent lines */
1169 clp = list_entry(v, struct nfs_client, cl_share_link);
1170
1171 /* Check if the client is initialized */
1172 if (clp->cl_cons_state != NFS_CS_READY)
1173 return 0;
1174
1175 rcu_read_lock();
1176 seq_printf(m, "v%u %s %s %3d %s\n",
1177 clp->rpc_ops->version,
1178 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1179 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1180 refcount_read(&clp->cl_count),
1181 clp->cl_hostname);
1182 rcu_read_unlock();
1183
1184 return 0;
1185}
1186
1187/*
1188 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1189 */
1190static int nfs_volume_list_open(struct inode *inode, struct file *file)
1191{
1192 return seq_open_net(inode, file, &nfs_volume_list_ops,
1193 sizeof(struct seq_net_private));
1194}
1195
1196/*
1197 * set up the iterator to start reading from the volume list and return the first item
1198 */
1199static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1200 __acquires(&nn->nfs_client_lock)
1201{
1202 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1203
1204 /* lock the list against modification */
1205 spin_lock(&nn->nfs_client_lock);
1206 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1207}
1208
1209/*
1210 * move to next volume
1211 */
1212static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1213{
1214 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1215
1216 return seq_list_next(v, &nn->nfs_volume_list, pos);
1217}
1218
1219/*
1220 * clean up after reading from the transports list
1221 */
1222static void nfs_volume_list_stop(struct seq_file *p, void *v)
1223 __releases(&nn->nfs_client_lock)
1224{
1225 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1226
1227 spin_unlock(&nn->nfs_client_lock);
1228}
1229
1230/*
1231 * display a header line followed by a load of call lines
1232 */
1233static int nfs_volume_list_show(struct seq_file *m, void *v)
1234{
1235 struct nfs_server *server;
1236 struct nfs_client *clp;
1237 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1238 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1239 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1240
1241 /* display header on line 1 */
1242 if (v == &nn->nfs_volume_list) {
1243 seq_puts(m, "NV SERVER PORT DEV FSID"
1244 " FSC\n");
1245 return 0;
1246 }
1247 /* display one transport per line on subsequent lines */
1248 server = list_entry(v, struct nfs_server, master_link);
1249 clp = server->nfs_client;
1250
1251 snprintf(dev, sizeof(dev), "%u:%u",
1252 MAJOR(server->s_dev), MINOR(server->s_dev));
1253
1254 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1255 (unsigned long long) server->fsid.major,
1256 (unsigned long long) server->fsid.minor);
1257
1258 rcu_read_lock();
1259 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1260 clp->rpc_ops->version,
1261 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1262 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1263 dev,
1264 fsid,
1265 nfs_server_fscache_state(server));
1266 rcu_read_unlock();
1267
1268 return 0;
1269}
1270
1271int nfs_fs_proc_net_init(struct net *net)
1272{
1273 struct nfs_net *nn = net_generic(net, nfs_net_id);
1274 struct proc_dir_entry *p;
1275
1276 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1277 if (!nn->proc_nfsfs)
1278 goto error_0;
1279
1280 /* a file of servers with which we're dealing */
1281 p = proc_create("servers", S_IFREG|S_IRUGO,
1282 nn->proc_nfsfs, &nfs_server_list_fops);
1283 if (!p)
1284 goto error_1;
1285
1286 /* a file of volumes that we have mounted */
1287 p = proc_create("volumes", S_IFREG|S_IRUGO,
1288 nn->proc_nfsfs, &nfs_volume_list_fops);
1289 if (!p)
1290 goto error_1;
1291 return 0;
1292
1293error_1:
1294 remove_proc_subtree("nfsfs", net->proc_net);
1295error_0:
1296 return -ENOMEM;
1297}
1298
1299void nfs_fs_proc_net_exit(struct net *net)
1300{
1301 remove_proc_subtree("nfsfs", net->proc_net);
1302}
1303
1304/*
1305 * initialise the /proc/fs/nfsfs/ directory
1306 */
1307int __init nfs_fs_proc_init(void)
1308{
1309 if (!proc_mkdir("fs/nfsfs", NULL))
1310 goto error_0;
1311
1312 /* a file of servers with which we're dealing */
1313 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1314 goto error_1;
1315
1316 /* a file of volumes that we have mounted */
1317 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1318 goto error_1;
1319
1320 return 0;
1321error_1:
1322 remove_proc_subtree("fs/nfsfs", NULL);
1323error_0:
1324 return -ENOMEM;
1325}
1326
1327/*
1328 * clean up the /proc/fs/nfsfs/ directory
1329 */
1330void nfs_fs_proc_exit(void)
1331{
1332 remove_proc_subtree("fs/nfsfs", NULL);
1333}
1334
1335#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_flags = cl_init->init_flags;
181 clp->cl_proto = cl_init->proto;
182 clp->cl_nconnect = cl_init->nconnect;
183 clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1;
184 clp->cl_net = get_net(cl_init->net);
185
186 clp->cl_principal = "*";
187 clp->cl_xprtsec = cl_init->xprtsec;
188 return clp;
189
190error_cleanup:
191 put_nfs_version(clp->cl_nfs_mod);
192error_dealloc:
193 kfree(clp);
194error_0:
195 return ERR_PTR(err);
196}
197EXPORT_SYMBOL_GPL(nfs_alloc_client);
198
199#if IS_ENABLED(CONFIG_NFS_V4)
200static void nfs_cleanup_cb_ident_idr(struct net *net)
201{
202 struct nfs_net *nn = net_generic(net, nfs_net_id);
203
204 idr_destroy(&nn->cb_ident_idr);
205}
206
207/* nfs_client_lock held */
208static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
209{
210 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
211
212 if (clp->cl_cb_ident)
213 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
214}
215
216static void pnfs_init_server(struct nfs_server *server)
217{
218 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
219}
220
221#else
222static void nfs_cleanup_cb_ident_idr(struct net *net)
223{
224}
225
226static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
227{
228}
229
230static void pnfs_init_server(struct nfs_server *server)
231{
232}
233
234#endif /* CONFIG_NFS_V4 */
235
236/*
237 * Destroy a shared client record
238 */
239void nfs_free_client(struct nfs_client *clp)
240{
241 /* -EIO all pending I/O */
242 if (!IS_ERR(clp->cl_rpcclient))
243 rpc_shutdown_client(clp->cl_rpcclient);
244
245 put_net(clp->cl_net);
246 put_nfs_version(clp->cl_nfs_mod);
247 kfree(clp->cl_hostname);
248 kfree(clp->cl_acceptor);
249 kfree_rcu(clp, rcu);
250}
251EXPORT_SYMBOL_GPL(nfs_free_client);
252
253/*
254 * Release a reference to a shared client record
255 */
256void nfs_put_client(struct nfs_client *clp)
257{
258 struct nfs_net *nn;
259
260 if (!clp)
261 return;
262
263 nn = net_generic(clp->cl_net, nfs_net_id);
264
265 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
266 list_del(&clp->cl_share_link);
267 nfs_cb_idr_remove_locked(clp);
268 spin_unlock(&nn->nfs_client_lock);
269
270 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
271
272 clp->rpc_ops->free_client(clp);
273 }
274}
275EXPORT_SYMBOL_GPL(nfs_put_client);
276
277/*
278 * Find an nfs_client on the list that matches the initialisation data
279 * that is supplied.
280 */
281static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
282{
283 struct nfs_client *clp;
284 const struct sockaddr *sap = (struct sockaddr *)data->addr;
285 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
286 int error;
287
288again:
289 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
290 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
291 /* Don't match clients that failed to initialise properly */
292 if (clp->cl_cons_state < 0)
293 continue;
294
295 /* If a client is still initializing then we need to wait */
296 if (clp->cl_cons_state > NFS_CS_READY) {
297 refcount_inc(&clp->cl_count);
298 spin_unlock(&nn->nfs_client_lock);
299 error = nfs_wait_client_init_complete(clp);
300 nfs_put_client(clp);
301 spin_lock(&nn->nfs_client_lock);
302 if (error < 0)
303 return ERR_PTR(error);
304 goto again;
305 }
306
307 /* Different NFS versions cannot share the same nfs_client */
308 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
309 continue;
310
311 if (clp->cl_proto != data->proto)
312 continue;
313 /* Match nfsv4 minorversion */
314 if (clp->cl_minorversion != data->minorversion)
315 continue;
316
317 /* Match request for a dedicated DS */
318 if (test_bit(NFS_CS_DS, &data->init_flags) !=
319 test_bit(NFS_CS_DS, &clp->cl_flags))
320 continue;
321
322 /* Match the full socket address */
323 if (!rpc_cmp_addr_port(sap, clap))
324 /* Match all xprt_switch full socket addresses */
325 if (IS_ERR(clp->cl_rpcclient) ||
326 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
327 sap))
328 continue;
329
330 /* Match the xprt security policy */
331 if (clp->cl_xprtsec.policy != data->xprtsec.policy)
332 continue;
333
334 refcount_inc(&clp->cl_count);
335 return clp;
336 }
337 return NULL;
338}
339
340/*
341 * Return true if @clp is done initializing, false if still working on it.
342 *
343 * Use nfs_client_init_status to check if it was successful.
344 */
345bool nfs_client_init_is_complete(const struct nfs_client *clp)
346{
347 return clp->cl_cons_state <= NFS_CS_READY;
348}
349EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
350
351/*
352 * Return 0 if @clp was successfully initialized, -errno otherwise.
353 *
354 * This must be called *after* nfs_client_init_is_complete() returns true,
355 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
356 */
357int nfs_client_init_status(const struct nfs_client *clp)
358{
359 /* called without checking nfs_client_init_is_complete */
360 if (clp->cl_cons_state > NFS_CS_READY) {
361 WARN_ON_ONCE(1);
362 return -EINVAL;
363 }
364 return clp->cl_cons_state;
365}
366EXPORT_SYMBOL_GPL(nfs_client_init_status);
367
368int nfs_wait_client_init_complete(const struct nfs_client *clp)
369{
370 return wait_event_killable(nfs_client_active_wq,
371 nfs_client_init_is_complete(clp));
372}
373EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
374
375/*
376 * Found an existing client. Make sure it's ready before returning.
377 */
378static struct nfs_client *
379nfs_found_client(const struct nfs_client_initdata *cl_init,
380 struct nfs_client *clp)
381{
382 int error;
383
384 error = nfs_wait_client_init_complete(clp);
385 if (error < 0) {
386 nfs_put_client(clp);
387 return ERR_PTR(-ERESTARTSYS);
388 }
389
390 if (clp->cl_cons_state < NFS_CS_READY) {
391 error = clp->cl_cons_state;
392 nfs_put_client(clp);
393 return ERR_PTR(error);
394 }
395
396 smp_rmb();
397 return clp;
398}
399
400/*
401 * Look up a client by IP address and protocol version
402 * - creates a new record if one doesn't yet exist
403 */
404struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
405{
406 struct nfs_client *clp, *new = NULL;
407 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
408 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
409
410 if (cl_init->hostname == NULL) {
411 WARN_ON(1);
412 return ERR_PTR(-EINVAL);
413 }
414
415 /* see if the client already exists */
416 do {
417 spin_lock(&nn->nfs_client_lock);
418
419 clp = nfs_match_client(cl_init);
420 if (clp) {
421 spin_unlock(&nn->nfs_client_lock);
422 if (new)
423 new->rpc_ops->free_client(new);
424 if (IS_ERR(clp))
425 return clp;
426 return nfs_found_client(cl_init, clp);
427 }
428 if (new) {
429 list_add_tail(&new->cl_share_link,
430 &nn->nfs_client_list);
431 spin_unlock(&nn->nfs_client_lock);
432 return rpc_ops->init_client(new, cl_init);
433 }
434
435 spin_unlock(&nn->nfs_client_lock);
436
437 new = rpc_ops->alloc_client(cl_init);
438 } while (!IS_ERR(new));
439
440 return new;
441}
442EXPORT_SYMBOL_GPL(nfs_get_client);
443
444/*
445 * Mark a server as ready or failed
446 */
447void nfs_mark_client_ready(struct nfs_client *clp, int state)
448{
449 smp_wmb();
450 clp->cl_cons_state = state;
451 wake_up_all(&nfs_client_active_wq);
452}
453EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
454
455/*
456 * Initialise the timeout values for a connection
457 */
458void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
459 int timeo, int retrans)
460{
461 to->to_initval = timeo * HZ / 10;
462 to->to_retries = retrans;
463
464 switch (proto) {
465 case XPRT_TRANSPORT_TCP:
466 case XPRT_TRANSPORT_TCP_TLS:
467 case XPRT_TRANSPORT_RDMA:
468 if (retrans == NFS_UNSPEC_RETRANS)
469 to->to_retries = NFS_DEF_TCP_RETRANS;
470 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
471 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
472 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
473 to->to_initval = NFS_MAX_TCP_TIMEOUT;
474 to->to_increment = to->to_initval;
475 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
476 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
477 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
478 if (to->to_maxval < to->to_initval)
479 to->to_maxval = to->to_initval;
480 to->to_exponential = 0;
481 break;
482 case XPRT_TRANSPORT_UDP:
483 if (retrans == NFS_UNSPEC_RETRANS)
484 to->to_retries = NFS_DEF_UDP_RETRANS;
485 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
486 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
487 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
488 to->to_initval = NFS_MAX_UDP_TIMEOUT;
489 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
490 to->to_exponential = 1;
491 break;
492 default:
493 BUG();
494 }
495}
496EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
497
498/*
499 * Create an RPC client handle
500 */
501int nfs_create_rpc_client(struct nfs_client *clp,
502 const struct nfs_client_initdata *cl_init,
503 rpc_authflavor_t flavor)
504{
505 struct rpc_clnt *clnt = NULL;
506 struct rpc_create_args args = {
507 .net = clp->cl_net,
508 .protocol = clp->cl_proto,
509 .nconnect = clp->cl_nconnect,
510 .address = (struct sockaddr *)&clp->cl_addr,
511 .addrsize = clp->cl_addrlen,
512 .timeout = cl_init->timeparms,
513 .servername = clp->cl_hostname,
514 .nodename = cl_init->nodename,
515 .program = &nfs_program,
516 .version = clp->rpc_ops->version,
517 .authflavor = flavor,
518 .cred = cl_init->cred,
519 .xprtsec = cl_init->xprtsec,
520 .connect_timeout = cl_init->connect_timeout,
521 .reconnect_timeout = cl_init->reconnect_timeout,
522 };
523
524 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
525 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
526 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
527 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
528 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
529 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
530 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
531 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
532 if (test_bit(NFS_CS_NOPING, &clp->cl_flags))
533 args.flags |= RPC_CLNT_CREATE_NOPING;
534 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags))
535 args.flags |= RPC_CLNT_CREATE_REUSEPORT;
536
537 if (!IS_ERR(clp->cl_rpcclient))
538 return 0;
539
540 clnt = rpc_create(&args);
541 if (IS_ERR(clnt)) {
542 dprintk("%s: cannot create RPC client. Error = %ld\n",
543 __func__, PTR_ERR(clnt));
544 return PTR_ERR(clnt);
545 }
546
547 clnt->cl_principal = clp->cl_principal;
548 clp->cl_rpcclient = clnt;
549 clnt->cl_max_connect = clp->cl_max_connect;
550 return 0;
551}
552EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
553
554/*
555 * Version 2 or 3 client destruction
556 */
557static void nfs_destroy_server(struct nfs_server *server)
558{
559 if (server->nlm_host)
560 nlmclnt_done(server->nlm_host);
561}
562
563/*
564 * Version 2 or 3 lockd setup
565 */
566static int nfs_start_lockd(struct nfs_server *server)
567{
568 struct nlm_host *host;
569 struct nfs_client *clp = server->nfs_client;
570 struct nlmclnt_initdata nlm_init = {
571 .hostname = clp->cl_hostname,
572 .address = (struct sockaddr *)&clp->cl_addr,
573 .addrlen = clp->cl_addrlen,
574 .nfs_version = clp->rpc_ops->version,
575 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
576 1 : 0,
577 .net = clp->cl_net,
578 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
579 .cred = server->cred,
580 };
581
582 if (nlm_init.nfs_version > 3)
583 return 0;
584 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
585 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
586 return 0;
587
588 switch (clp->cl_proto) {
589 default:
590 nlm_init.protocol = IPPROTO_TCP;
591 break;
592#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
593 case XPRT_TRANSPORT_UDP:
594 nlm_init.protocol = IPPROTO_UDP;
595#endif
596 }
597
598 host = nlmclnt_init(&nlm_init);
599 if (IS_ERR(host))
600 return PTR_ERR(host);
601
602 server->nlm_host = host;
603 server->destroy = nfs_destroy_server;
604 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL);
605 return 0;
606}
607
608/*
609 * Create a general RPC client
610 */
611int nfs_init_server_rpcclient(struct nfs_server *server,
612 const struct rpc_timeout *timeo,
613 rpc_authflavor_t pseudoflavour)
614{
615 struct nfs_client *clp = server->nfs_client;
616
617 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
618 pseudoflavour);
619 if (IS_ERR(server->client)) {
620 dprintk("%s: couldn't create rpc_client!\n", __func__);
621 return PTR_ERR(server->client);
622 }
623
624 memcpy(&server->client->cl_timeout_default,
625 timeo,
626 sizeof(server->client->cl_timeout_default));
627 server->client->cl_timeout = &server->client->cl_timeout_default;
628 server->client->cl_softrtry = 0;
629 if (server->flags & NFS_MOUNT_SOFTERR)
630 server->client->cl_softerr = 1;
631 if (server->flags & NFS_MOUNT_SOFT)
632 server->client->cl_softrtry = 1;
633
634 nfs_sysfs_link_rpc_client(server, server->client, NULL);
635 return 0;
636}
637EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
638
639/**
640 * nfs_init_client - Initialise an NFS2 or NFS3 client
641 *
642 * @clp: nfs_client to initialise
643 * @cl_init: Initialisation parameters
644 *
645 * Returns pointer to an NFS client, or an ERR_PTR value.
646 */
647struct nfs_client *nfs_init_client(struct nfs_client *clp,
648 const struct nfs_client_initdata *cl_init)
649{
650 int error;
651
652 /* the client is already initialised */
653 if (clp->cl_cons_state == NFS_CS_READY)
654 return clp;
655
656 /*
657 * Create a client RPC handle for doing FSSTAT with UNIX auth only
658 * - RFC 2623, sec 2.3.2
659 */
660 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
661 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
662 if (error < 0) {
663 nfs_put_client(clp);
664 clp = ERR_PTR(error);
665 }
666 return clp;
667}
668EXPORT_SYMBOL_GPL(nfs_init_client);
669
670/*
671 * Create a version 2 or 3 client
672 */
673static int nfs_init_server(struct nfs_server *server,
674 const struct fs_context *fc)
675{
676 const struct nfs_fs_context *ctx = nfs_fc2context(fc);
677 struct rpc_timeout timeparms;
678 struct nfs_client_initdata cl_init = {
679 .hostname = ctx->nfs_server.hostname,
680 .addr = &ctx->nfs_server._address,
681 .addrlen = ctx->nfs_server.addrlen,
682 .nfs_mod = ctx->nfs_mod,
683 .proto = ctx->nfs_server.protocol,
684 .net = fc->net_ns,
685 .timeparms = &timeparms,
686 .cred = server->cred,
687 .nconnect = ctx->nfs_server.nconnect,
688 .init_flags = (1UL << NFS_CS_REUSEPORT),
689 .xprtsec = ctx->xprtsec,
690 };
691 struct nfs_client *clp;
692 int error;
693
694 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
695 ctx->timeo, ctx->retrans);
696 if (ctx->flags & NFS_MOUNT_NORESVPORT)
697 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
698
699 /* Allocate or find a client reference we can use */
700 clp = nfs_get_client(&cl_init);
701 if (IS_ERR(clp))
702 return PTR_ERR(clp);
703
704 server->nfs_client = clp;
705 nfs_sysfs_add_server(server);
706 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state");
707
708 /* Initialise the client representation from the mount data */
709 server->flags = ctx->flags;
710 server->options = ctx->options;
711 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS;
712
713 switch (clp->rpc_ops->version) {
714 case 2:
715 server->fattr_valid = NFS_ATTR_FATTR_V2;
716 break;
717 case 3:
718 server->fattr_valid = NFS_ATTR_FATTR_V3;
719 break;
720 default:
721 server->fattr_valid = NFS_ATTR_FATTR_V4;
722 }
723
724 if (ctx->rsize)
725 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto);
726 if (ctx->wsize)
727 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto);
728
729 server->acregmin = ctx->acregmin * HZ;
730 server->acregmax = ctx->acregmax * HZ;
731 server->acdirmin = ctx->acdirmin * HZ;
732 server->acdirmax = ctx->acdirmax * HZ;
733
734 /* Start lockd here, before we might error out */
735 error = nfs_start_lockd(server);
736 if (error < 0)
737 goto error;
738
739 server->port = ctx->nfs_server.port;
740 server->auth_info = ctx->auth_info;
741
742 error = nfs_init_server_rpcclient(server, &timeparms,
743 ctx->selected_flavor);
744 if (error < 0)
745 goto error;
746
747 /* Preserve the values of mount_server-related mount options */
748 if (ctx->mount_server.addrlen) {
749 memcpy(&server->mountd_address, &ctx->mount_server.address,
750 ctx->mount_server.addrlen);
751 server->mountd_addrlen = ctx->mount_server.addrlen;
752 }
753 server->mountd_version = ctx->mount_server.version;
754 server->mountd_port = ctx->mount_server.port;
755 server->mountd_protocol = ctx->mount_server.protocol;
756
757 server->namelen = ctx->namlen;
758 return 0;
759
760error:
761 server->nfs_client = NULL;
762 nfs_put_client(clp);
763 return error;
764}
765
766/*
767 * Load up the server record from information gained in an fsinfo record
768 */
769static void nfs_server_set_fsinfo(struct nfs_server *server,
770 struct nfs_fsinfo *fsinfo)
771{
772 struct nfs_client *clp = server->nfs_client;
773 unsigned long max_rpc_payload, raw_max_rpc_payload;
774
775 /* Work out a lot of parameters */
776 if (server->rsize == 0)
777 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto);
778 if (server->wsize == 0)
779 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto);
780
781 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
782 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto);
783 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
784 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto);
785
786 raw_max_rpc_payload = rpc_max_payload(server->client);
787 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL);
788
789 if (server->rsize > max_rpc_payload)
790 server->rsize = max_rpc_payload;
791 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
792 server->rsize = NFS_MAX_FILE_IO_SIZE;
793 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
794
795 if (server->wsize > max_rpc_payload)
796 server->wsize = max_rpc_payload;
797 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
798 server->wsize = NFS_MAX_FILE_IO_SIZE;
799 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
800
801 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
802
803 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
804 if (server->dtsize > NFS_MAX_FILE_IO_SIZE)
805 server->dtsize = NFS_MAX_FILE_IO_SIZE;
806 if (server->dtsize > server->rsize)
807 server->dtsize = server->rsize;
808
809 if (server->flags & NFS_MOUNT_NOAC) {
810 server->acregmin = server->acregmax = 0;
811 server->acdirmin = server->acdirmax = 0;
812 }
813
814 server->maxfilesize = fsinfo->maxfilesize;
815
816 server->time_delta = fsinfo->time_delta;
817 server->change_attr_type = fsinfo->change_attr_type;
818
819 server->clone_blksize = fsinfo->clone_blksize;
820 /* We're airborne Set socket buffersize */
821 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
822
823#ifdef CONFIG_NFS_V4_2
824 /*
825 * Defaults until limited by the session parameters.
826 */
827 server->gxasize = min_t(unsigned int, raw_max_rpc_payload,
828 XATTR_SIZE_MAX);
829 server->sxasize = min_t(unsigned int, raw_max_rpc_payload,
830 XATTR_SIZE_MAX);
831 server->lxasize = min_t(unsigned int, raw_max_rpc_payload,
832 nfs42_listxattr_xdrsize(XATTR_LIST_MAX));
833
834 if (fsinfo->xattr_support)
835 server->caps |= NFS_CAP_XATTR;
836#endif
837}
838
839/*
840 * Probe filesystem information, including the FSID on v2/v3
841 */
842static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
843{
844 struct nfs_fsinfo fsinfo;
845 struct nfs_client *clp = server->nfs_client;
846 int error;
847
848 if (clp->rpc_ops->set_capabilities != NULL) {
849 error = clp->rpc_ops->set_capabilities(server, mntfh);
850 if (error < 0)
851 return error;
852 }
853
854 fsinfo.fattr = fattr;
855 fsinfo.nlayouttypes = 0;
856 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
857 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
858 if (error < 0)
859 return error;
860
861 nfs_server_set_fsinfo(server, &fsinfo);
862
863 /* Get some general file system info */
864 if (server->namelen == 0) {
865 struct nfs_pathconf pathinfo;
866
867 pathinfo.fattr = fattr;
868 nfs_fattr_init(fattr);
869
870 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
871 server->namelen = pathinfo.max_namelen;
872 }
873
874 if (clp->rpc_ops->discover_trunking != NULL &&
875 (server->caps & NFS_CAP_FS_LOCATIONS &&
876 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) {
877 error = clp->rpc_ops->discover_trunking(server, mntfh);
878 if (error < 0)
879 return error;
880 }
881
882 return 0;
883}
884
885/*
886 * Grab the destination's particulars, including lease expiry time.
887 *
888 * Returns zero if probe succeeded and retrieved FSID matches the FSID
889 * we have cached.
890 */
891int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh)
892{
893 struct nfs_fattr *fattr;
894 int error;
895
896 fattr = nfs_alloc_fattr();
897 if (fattr == NULL)
898 return -ENOMEM;
899
900 /* Sanity: the probe won't work if the destination server
901 * does not recognize the migrated FH. */
902 error = nfs_probe_fsinfo(server, mntfh, fattr);
903
904 nfs_free_fattr(fattr);
905 return error;
906}
907EXPORT_SYMBOL_GPL(nfs_probe_server);
908
909/*
910 * Copy useful information when duplicating a server record
911 */
912void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
913{
914 target->flags = source->flags;
915 target->rsize = source->rsize;
916 target->wsize = source->wsize;
917 target->acregmin = source->acregmin;
918 target->acregmax = source->acregmax;
919 target->acdirmin = source->acdirmin;
920 target->acdirmax = source->acdirmax;
921 target->caps = source->caps;
922 target->options = source->options;
923 target->auth_info = source->auth_info;
924 target->port = source->port;
925}
926EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
927
928void nfs_server_insert_lists(struct nfs_server *server)
929{
930 struct nfs_client *clp = server->nfs_client;
931 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
932
933 spin_lock(&nn->nfs_client_lock);
934 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
935 list_add_tail(&server->master_link, &nn->nfs_volume_list);
936 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
937 spin_unlock(&nn->nfs_client_lock);
938
939}
940EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
941
942void nfs_server_remove_lists(struct nfs_server *server)
943{
944 struct nfs_client *clp = server->nfs_client;
945 struct nfs_net *nn;
946
947 if (clp == NULL)
948 return;
949 nn = net_generic(clp->cl_net, nfs_net_id);
950 spin_lock(&nn->nfs_client_lock);
951 list_del_rcu(&server->client_link);
952 if (list_empty(&clp->cl_superblocks))
953 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
954 list_del(&server->master_link);
955 spin_unlock(&nn->nfs_client_lock);
956
957 synchronize_rcu();
958}
959EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
960
961static DEFINE_IDA(s_sysfs_ids);
962
963/*
964 * Allocate and initialise a server record
965 */
966struct nfs_server *nfs_alloc_server(void)
967{
968 struct nfs_server *server;
969
970 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
971 if (!server)
972 return NULL;
973
974 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL);
975 if (server->s_sysfs_id < 0) {
976 kfree(server);
977 return NULL;
978 }
979
980 server->client = server->client_acl = ERR_PTR(-EINVAL);
981
982 /* Zero out the NFS state stuff */
983 INIT_LIST_HEAD(&server->client_link);
984 INIT_LIST_HEAD(&server->master_link);
985 INIT_LIST_HEAD(&server->delegations);
986 INIT_LIST_HEAD(&server->layouts);
987 INIT_LIST_HEAD(&server->state_owners_lru);
988 INIT_LIST_HEAD(&server->ss_copies);
989
990 atomic_set(&server->active, 0);
991
992 server->io_stats = nfs_alloc_iostats();
993 if (!server->io_stats) {
994 kfree(server);
995 return NULL;
996 }
997
998 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
999
1000 ida_init(&server->openowner_id);
1001 ida_init(&server->lockowner_id);
1002 pnfs_init_server(server);
1003 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
1004
1005 return server;
1006}
1007EXPORT_SYMBOL_GPL(nfs_alloc_server);
1008
1009static void delayed_free(struct rcu_head *p)
1010{
1011 struct nfs_server *server = container_of(p, struct nfs_server, rcu);
1012
1013 nfs_free_iostats(server->io_stats);
1014 kfree(server);
1015}
1016
1017/*
1018 * Free up a server record
1019 */
1020void nfs_free_server(struct nfs_server *server)
1021{
1022 nfs_server_remove_lists(server);
1023
1024 if (server->destroy != NULL)
1025 server->destroy(server);
1026
1027 if (!IS_ERR(server->client_acl))
1028 rpc_shutdown_client(server->client_acl);
1029 if (!IS_ERR(server->client))
1030 rpc_shutdown_client(server->client);
1031
1032 nfs_put_client(server->nfs_client);
1033
1034 if (server->kobj.state_initialized) {
1035 nfs_sysfs_remove_server(server);
1036 kobject_put(&server->kobj);
1037 }
1038 ida_free(&s_sysfs_ids, server->s_sysfs_id);
1039
1040 ida_destroy(&server->lockowner_id);
1041 ida_destroy(&server->openowner_id);
1042 put_cred(server->cred);
1043 nfs_release_automount_timer();
1044 call_rcu(&server->rcu, delayed_free);
1045}
1046EXPORT_SYMBOL_GPL(nfs_free_server);
1047
1048/*
1049 * Create a version 2 or 3 volume record
1050 * - keyed on server and FSID
1051 */
1052struct nfs_server *nfs_create_server(struct fs_context *fc)
1053{
1054 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1055 struct nfs_server *server;
1056 struct nfs_fattr *fattr;
1057 int error;
1058
1059 server = nfs_alloc_server();
1060 if (!server)
1061 return ERR_PTR(-ENOMEM);
1062
1063 server->cred = get_cred(fc->cred);
1064
1065 error = -ENOMEM;
1066 fattr = nfs_alloc_fattr();
1067 if (fattr == NULL)
1068 goto error;
1069
1070 /* Get a client representation */
1071 error = nfs_init_server(server, fc);
1072 if (error < 0)
1073 goto error;
1074
1075 /* Probe the root fh to retrieve its FSID */
1076 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
1077 if (error < 0)
1078 goto error;
1079 if (server->nfs_client->rpc_ops->version == 3) {
1080 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1081 server->namelen = NFS3_MAXNAMLEN;
1082 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
1083 server->caps |= NFS_CAP_READDIRPLUS;
1084 } else {
1085 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1086 server->namelen = NFS2_MAXNAMLEN;
1087 }
1088
1089 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1090 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh,
1091 fattr, NULL);
1092 if (error < 0) {
1093 dprintk("nfs_create_server: getattr error = %d\n", -error);
1094 goto error;
1095 }
1096 }
1097 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1098
1099 dprintk("Server FSID: %llx:%llx\n",
1100 (unsigned long long) server->fsid.major,
1101 (unsigned long long) server->fsid.minor);
1102
1103 nfs_server_insert_lists(server);
1104 server->mount_time = jiffies;
1105 nfs_free_fattr(fattr);
1106 return server;
1107
1108error:
1109 nfs_free_fattr(fattr);
1110 nfs_free_server(server);
1111 return ERR_PTR(error);
1112}
1113EXPORT_SYMBOL_GPL(nfs_create_server);
1114
1115/*
1116 * Clone an NFS2, NFS3 or NFS4 server record
1117 */
1118struct nfs_server *nfs_clone_server(struct nfs_server *source,
1119 struct nfs_fh *fh,
1120 struct nfs_fattr *fattr,
1121 rpc_authflavor_t flavor)
1122{
1123 struct nfs_server *server;
1124 int error;
1125
1126 server = nfs_alloc_server();
1127 if (!server)
1128 return ERR_PTR(-ENOMEM);
1129
1130 server->cred = get_cred(source->cred);
1131
1132 /* Copy data from the source */
1133 server->nfs_client = source->nfs_client;
1134 server->destroy = source->destroy;
1135 refcount_inc(&server->nfs_client->cl_count);
1136 nfs_server_copy_userdata(server, source);
1137
1138 server->fsid = fattr->fsid;
1139
1140 nfs_sysfs_add_server(server);
1141
1142 nfs_sysfs_link_rpc_client(server,
1143 server->nfs_client->cl_rpcclient, "_state");
1144
1145 error = nfs_init_server_rpcclient(server,
1146 source->client->cl_timeout,
1147 flavor);
1148 if (error < 0)
1149 goto out_free_server;
1150
1151 /* probe the filesystem info for this server filesystem */
1152 error = nfs_probe_server(server, fh);
1153 if (error < 0)
1154 goto out_free_server;
1155
1156 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1157 server->namelen = NFS4_MAXNAMLEN;
1158
1159 error = nfs_start_lockd(server);
1160 if (error < 0)
1161 goto out_free_server;
1162
1163 nfs_server_insert_lists(server);
1164 server->mount_time = jiffies;
1165
1166 return server;
1167
1168out_free_server:
1169 nfs_free_server(server);
1170 return ERR_PTR(error);
1171}
1172EXPORT_SYMBOL_GPL(nfs_clone_server);
1173
1174void nfs_clients_init(struct net *net)
1175{
1176 struct nfs_net *nn = net_generic(net, nfs_net_id);
1177
1178 INIT_LIST_HEAD(&nn->nfs_client_list);
1179 INIT_LIST_HEAD(&nn->nfs_volume_list);
1180#if IS_ENABLED(CONFIG_NFS_V4)
1181 idr_init(&nn->cb_ident_idr);
1182#endif
1183 spin_lock_init(&nn->nfs_client_lock);
1184 nn->boot_time = ktime_get_real();
1185
1186 nfs_netns_sysfs_setup(nn, net);
1187}
1188
1189void nfs_clients_exit(struct net *net)
1190{
1191 struct nfs_net *nn = net_generic(net, nfs_net_id);
1192
1193 nfs_netns_sysfs_destroy(nn);
1194 nfs_cleanup_cb_ident_idr(net);
1195 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
1196 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1197}
1198
1199#ifdef CONFIG_PROC_FS
1200static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1201static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1202static void nfs_server_list_stop(struct seq_file *p, void *v);
1203static int nfs_server_list_show(struct seq_file *m, void *v);
1204
1205static const struct seq_operations nfs_server_list_ops = {
1206 .start = nfs_server_list_start,
1207 .next = nfs_server_list_next,
1208 .stop = nfs_server_list_stop,
1209 .show = nfs_server_list_show,
1210};
1211
1212static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1213static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1214static void nfs_volume_list_stop(struct seq_file *p, void *v);
1215static int nfs_volume_list_show(struct seq_file *m, void *v);
1216
1217static const struct seq_operations nfs_volume_list_ops = {
1218 .start = nfs_volume_list_start,
1219 .next = nfs_volume_list_next,
1220 .stop = nfs_volume_list_stop,
1221 .show = nfs_volume_list_show,
1222};
1223
1224/*
1225 * set up the iterator to start reading from the server list and return the first item
1226 */
1227static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1228 __acquires(&nn->nfs_client_lock)
1229{
1230 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1231
1232 /* lock the list against modification */
1233 spin_lock(&nn->nfs_client_lock);
1234 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1235}
1236
1237/*
1238 * move to next server
1239 */
1240static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1241{
1242 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1243
1244 return seq_list_next(v, &nn->nfs_client_list, pos);
1245}
1246
1247/*
1248 * clean up after reading from the transports list
1249 */
1250static void nfs_server_list_stop(struct seq_file *p, void *v)
1251 __releases(&nn->nfs_client_lock)
1252{
1253 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1254
1255 spin_unlock(&nn->nfs_client_lock);
1256}
1257
1258/*
1259 * display a header line followed by a load of call lines
1260 */
1261static int nfs_server_list_show(struct seq_file *m, void *v)
1262{
1263 struct nfs_client *clp;
1264 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1265
1266 /* display header on line 1 */
1267 if (v == &nn->nfs_client_list) {
1268 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1269 return 0;
1270 }
1271
1272 /* display one transport per line on subsequent lines */
1273 clp = list_entry(v, struct nfs_client, cl_share_link);
1274
1275 /* Check if the client is initialized */
1276 if (clp->cl_cons_state != NFS_CS_READY)
1277 return 0;
1278
1279 rcu_read_lock();
1280 seq_printf(m, "v%u %s %s %3d %s\n",
1281 clp->rpc_ops->version,
1282 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1283 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1284 refcount_read(&clp->cl_count),
1285 clp->cl_hostname);
1286 rcu_read_unlock();
1287
1288 return 0;
1289}
1290
1291/*
1292 * set up the iterator to start reading from the volume list and return the first item
1293 */
1294static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1295 __acquires(&nn->nfs_client_lock)
1296{
1297 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1298
1299 /* lock the list against modification */
1300 spin_lock(&nn->nfs_client_lock);
1301 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1302}
1303
1304/*
1305 * move to next volume
1306 */
1307static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1308{
1309 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1310
1311 return seq_list_next(v, &nn->nfs_volume_list, pos);
1312}
1313
1314/*
1315 * clean up after reading from the transports list
1316 */
1317static void nfs_volume_list_stop(struct seq_file *p, void *v)
1318 __releases(&nn->nfs_client_lock)
1319{
1320 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1321
1322 spin_unlock(&nn->nfs_client_lock);
1323}
1324
1325/*
1326 * display a header line followed by a load of call lines
1327 */
1328static int nfs_volume_list_show(struct seq_file *m, void *v)
1329{
1330 struct nfs_server *server;
1331 struct nfs_client *clp;
1332 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1333 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1334 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1335
1336 /* display header on line 1 */
1337 if (v == &nn->nfs_volume_list) {
1338 seq_puts(m, "NV SERVER PORT DEV FSID"
1339 " FSC\n");
1340 return 0;
1341 }
1342 /* display one transport per line on subsequent lines */
1343 server = list_entry(v, struct nfs_server, master_link);
1344 clp = server->nfs_client;
1345
1346 snprintf(dev, sizeof(dev), "%u:%u",
1347 MAJOR(server->s_dev), MINOR(server->s_dev));
1348
1349 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1350 (unsigned long long) server->fsid.major,
1351 (unsigned long long) server->fsid.minor);
1352
1353 rcu_read_lock();
1354 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1355 clp->rpc_ops->version,
1356 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1357 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1358 dev,
1359 fsid,
1360 nfs_server_fscache_state(server));
1361 rcu_read_unlock();
1362
1363 return 0;
1364}
1365
1366int nfs_fs_proc_net_init(struct net *net)
1367{
1368 struct nfs_net *nn = net_generic(net, nfs_net_id);
1369 struct proc_dir_entry *p;
1370
1371 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1372 if (!nn->proc_nfsfs)
1373 goto error_0;
1374
1375 /* a file of servers with which we're dealing */
1376 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1377 &nfs_server_list_ops, sizeof(struct seq_net_private));
1378 if (!p)
1379 goto error_1;
1380
1381 /* a file of volumes that we have mounted */
1382 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1383 &nfs_volume_list_ops, sizeof(struct seq_net_private));
1384 if (!p)
1385 goto error_1;
1386 return 0;
1387
1388error_1:
1389 remove_proc_subtree("nfsfs", net->proc_net);
1390error_0:
1391 return -ENOMEM;
1392}
1393
1394void nfs_fs_proc_net_exit(struct net *net)
1395{
1396 remove_proc_subtree("nfsfs", net->proc_net);
1397}
1398
1399/*
1400 * initialise the /proc/fs/nfsfs/ directory
1401 */
1402int __init nfs_fs_proc_init(void)
1403{
1404 if (!proc_mkdir("fs/nfsfs", NULL))
1405 goto error_0;
1406
1407 /* a file of servers with which we're dealing */
1408 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1409 goto error_1;
1410
1411 /* a file of volumes that we have mounted */
1412 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1413 goto error_1;
1414
1415 return 0;
1416error_1:
1417 remove_proc_subtree("fs/nfsfs", NULL);
1418error_0:
1419 return -ENOMEM;
1420}
1421
1422/*
1423 * clean up the /proc/fs/nfsfs/ directory
1424 */
1425void nfs_fs_proc_exit(void)
1426{
1427 remove_proc_subtree("fs/nfsfs", NULL);
1428 ida_destroy(&s_sysfs_ids);
1429}
1430
1431#endif /* CONFIG_PROC_FS */