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
57 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
58 static DEFINE_SPINLOCK(nfs_version_lock);
59 static DEFINE_MUTEX(nfs_version_mutex);
60 static LIST_HEAD(nfs_versions);
61
62 /*
63 * RPC cruft for NFS
64 */
65 static const struct rpc_version *nfs_version[5] = {
66 [2] = NULL,
67 [3] = NULL,
68 [4] = NULL,
69 };
70
71 const struct rpc_program nfs_program = {
72 .name = "nfs",
73 .number = NFS_PROGRAM,
74 .nrvers = ARRAY_SIZE(nfs_version),
75 .version = nfs_version,
76 .pipe_dir_name = NFS_PIPE_DIRNAME,
77 };
78
79 static struct nfs_subversion *find_nfs_version(unsigned int version)
80 {
81 struct nfs_subversion *nfs;
82 spin_lock(&nfs_version_lock);
83
84 list_for_each_entry(nfs, &nfs_versions, list) {
85 if (nfs->rpc_ops->version == version) {
86 spin_unlock(&nfs_version_lock);
87 return nfs;
88 }
89 }
90
91 spin_unlock(&nfs_version_lock);
92 return ERR_PTR(-EPROTONOSUPPORT);
93 }
94
95 struct nfs_subversion *get_nfs_version(unsigned int version)
96 {
97 struct nfs_subversion *nfs = find_nfs_version(version);
98
99 if (IS_ERR(nfs)) {
100 mutex_lock(&nfs_version_mutex);
101 request_module("nfsv%d", version);
102 nfs = find_nfs_version(version);
103 mutex_unlock(&nfs_version_mutex);
104 }
105
106 if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
107 return ERR_PTR(-EAGAIN);
108 return nfs;
109 }
110
111 void put_nfs_version(struct nfs_subversion *nfs)
112 {
113 module_put(nfs->owner);
114 }
115
116 void register_nfs_version(struct nfs_subversion *nfs)
117 {
118 spin_lock(&nfs_version_lock);
119
120 list_add(&nfs->list, &nfs_versions);
121 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
122
123 spin_unlock(&nfs_version_lock);
124 }
125 EXPORT_SYMBOL_GPL(register_nfs_version);
126
127 void unregister_nfs_version(struct nfs_subversion *nfs)
128 {
129 spin_lock(&nfs_version_lock);
130
131 nfs_version[nfs->rpc_ops->version] = NULL;
132 list_del(&nfs->list);
133
134 spin_unlock(&nfs_version_lock);
135 }
136 EXPORT_SYMBOL_GPL(unregister_nfs_version);
137
138 /*
139 * Allocate a shared client record
140 *
141 * Since these are allocated/deallocated very rarely, we don't
142 * bother putting them in a slab cache...
143 */
144 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
145 {
146 struct nfs_client *clp;
147 int err = -ENOMEM;
148
149 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
150 goto error_0;
151
152 clp->cl_minorversion = cl_init->minorversion;
153 clp->cl_nfs_mod = cl_init->nfs_mod;
154 if (!try_module_get(clp->cl_nfs_mod->owner))
155 goto error_dealloc;
156
157 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
158
159 refcount_set(&clp->cl_count, 1);
160 clp->cl_cons_state = NFS_CS_INITING;
161
162 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
163 clp->cl_addrlen = cl_init->addrlen;
164
165 if (cl_init->hostname) {
166 err = -ENOMEM;
167 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
168 if (!clp->cl_hostname)
169 goto error_cleanup;
170 }
171
172 INIT_LIST_HEAD(&clp->cl_superblocks);
173 clp->cl_rpcclient = ERR_PTR(-EINVAL);
174
175 clp->cl_flags = cl_init->init_flags;
176 clp->cl_proto = cl_init->proto;
177 clp->cl_nconnect = cl_init->nconnect;
178 clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1;
179 clp->cl_net = get_net(cl_init->net);
180
181 clp->cl_principal = "*";
182 clp->cl_xprtsec = cl_init->xprtsec;
183 return clp;
184
185 error_cleanup:
186 put_nfs_version(clp->cl_nfs_mod);
187 error_dealloc:
188 kfree(clp);
189 error_0:
190 return ERR_PTR(err);
191 }
192 EXPORT_SYMBOL_GPL(nfs_alloc_client);
193
194 #if IS_ENABLED(CONFIG_NFS_V4)
195 static void nfs_cleanup_cb_ident_idr(struct net *net)
196 {
197 struct nfs_net *nn = net_generic(net, nfs_net_id);
198
199 idr_destroy(&nn->cb_ident_idr);
200 }
201
202 /* nfs_client_lock held */
203 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
204 {
205 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
206
207 if (clp->cl_cb_ident)
208 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
209 }
210
211 static void pnfs_init_server(struct nfs_server *server)
212 {
213 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
214 }
215
216 #else
217 static void nfs_cleanup_cb_ident_idr(struct net *net)
218 {
219 }
220
221 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
222 {
223 }
224
225 static void pnfs_init_server(struct nfs_server *server)
226 {
227 }
228
229 #endif /* CONFIG_NFS_V4 */
230
231 /*
232 * Destroy a shared client record
233 */
234 void nfs_free_client(struct nfs_client *clp)
235 {
236 /* -EIO all pending I/O */
237 if (!IS_ERR(clp->cl_rpcclient))
238 rpc_shutdown_client(clp->cl_rpcclient);
239
240 put_net(clp->cl_net);
241 put_nfs_version(clp->cl_nfs_mod);
242 kfree(clp->cl_hostname);
243 kfree(clp->cl_acceptor);
244 kfree_rcu(clp, rcu);
245 }
246 EXPORT_SYMBOL_GPL(nfs_free_client);
247
248 /*
249 * Release a reference to a shared client record
250 */
251 void nfs_put_client(struct nfs_client *clp)
252 {
253 struct nfs_net *nn;
254
255 if (!clp)
256 return;
257
258 nn = net_generic(clp->cl_net, nfs_net_id);
259
260 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
261 list_del(&clp->cl_share_link);
262 nfs_cb_idr_remove_locked(clp);
263 spin_unlock(&nn->nfs_client_lock);
264
265 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
266
267 clp->rpc_ops->free_client(clp);
268 }
269 }
270 EXPORT_SYMBOL_GPL(nfs_put_client);
271
272 /*
273 * Find an nfs_client on the list that matches the initialisation data
274 * that is supplied.
275 */
276 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
277 {
278 struct nfs_client *clp;
279 const struct sockaddr *sap = (struct sockaddr *)data->addr;
280 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
281 int error;
282
283 again:
284 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
285 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
286 /* Don't match clients that failed to initialise properly */
287 if (clp->cl_cons_state < 0)
288 continue;
289
290 /* If a client is still initializing then we need to wait */
291 if (clp->cl_cons_state > NFS_CS_READY) {
292 refcount_inc(&clp->cl_count);
293 spin_unlock(&nn->nfs_client_lock);
294 error = nfs_wait_client_init_complete(clp);
295 nfs_put_client(clp);
296 spin_lock(&nn->nfs_client_lock);
297 if (error < 0)
298 return ERR_PTR(error);
299 goto again;
300 }
301
302 /* Different NFS versions cannot share the same nfs_client */
303 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
304 continue;
305
306 if (clp->cl_proto != data->proto)
307 continue;
308 /* Match nfsv4 minorversion */
309 if (clp->cl_minorversion != data->minorversion)
310 continue;
311
312 /* Match request for a dedicated DS */
313 if (test_bit(NFS_CS_DS, &data->init_flags) !=
314 test_bit(NFS_CS_DS, &clp->cl_flags))
315 continue;
316
317 /* Match the full socket address */
318 if (!rpc_cmp_addr_port(sap, clap))
319 /* Match all xprt_switch full socket addresses */
320 if (IS_ERR(clp->cl_rpcclient) ||
321 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
322 sap))
323 continue;
324
325 /* Match the xprt security policy */
326 if (clp->cl_xprtsec.policy != data->xprtsec.policy)
327 continue;
328
329 refcount_inc(&clp->cl_count);
330 return clp;
331 }
332 return NULL;
333 }
334
335 /*
336 * Return true if @clp is done initializing, false if still working on it.
337 *
338 * Use nfs_client_init_status to check if it was successful.
339 */
340 bool nfs_client_init_is_complete(const struct nfs_client *clp)
341 {
342 return clp->cl_cons_state <= NFS_CS_READY;
343 }
344 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
345
346 /*
347 * Return 0 if @clp was successfully initialized, -errno otherwise.
348 *
349 * This must be called *after* nfs_client_init_is_complete() returns true,
350 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
351 */
352 int nfs_client_init_status(const struct nfs_client *clp)
353 {
354 /* called without checking nfs_client_init_is_complete */
355 if (clp->cl_cons_state > NFS_CS_READY) {
356 WARN_ON_ONCE(1);
357 return -EINVAL;
358 }
359 return clp->cl_cons_state;
360 }
361 EXPORT_SYMBOL_GPL(nfs_client_init_status);
362
363 int nfs_wait_client_init_complete(const struct nfs_client *clp)
364 {
365 return wait_event_killable(nfs_client_active_wq,
366 nfs_client_init_is_complete(clp));
367 }
368 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
369
370 /*
371 * Found an existing client. Make sure it's ready before returning.
372 */
373 static struct nfs_client *
374 nfs_found_client(const struct nfs_client_initdata *cl_init,
375 struct nfs_client *clp)
376 {
377 int error;
378
379 error = nfs_wait_client_init_complete(clp);
380 if (error < 0) {
381 nfs_put_client(clp);
382 return ERR_PTR(-ERESTARTSYS);
383 }
384
385 if (clp->cl_cons_state < NFS_CS_READY) {
386 error = clp->cl_cons_state;
387 nfs_put_client(clp);
388 return ERR_PTR(error);
389 }
390
391 smp_rmb();
392 return clp;
393 }
394
395 /*
396 * Look up a client by IP address and protocol version
397 * - creates a new record if one doesn't yet exist
398 */
399 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
400 {
401 struct nfs_client *clp, *new = NULL;
402 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
403 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
404
405 if (cl_init->hostname == NULL) {
406 WARN_ON(1);
407 return ERR_PTR(-EINVAL);
408 }
409
410 /* see if the client already exists */
411 do {
412 spin_lock(&nn->nfs_client_lock);
413
414 clp = nfs_match_client(cl_init);
415 if (clp) {
416 spin_unlock(&nn->nfs_client_lock);
417 if (new)
418 new->rpc_ops->free_client(new);
419 if (IS_ERR(clp))
420 return clp;
421 return nfs_found_client(cl_init, clp);
422 }
423 if (new) {
424 list_add_tail(&new->cl_share_link,
425 &nn->nfs_client_list);
426 spin_unlock(&nn->nfs_client_lock);
427 return rpc_ops->init_client(new, cl_init);
428 }
429
430 spin_unlock(&nn->nfs_client_lock);
431
432 new = rpc_ops->alloc_client(cl_init);
433 } while (!IS_ERR(new));
434
435 return new;
436 }
437 EXPORT_SYMBOL_GPL(nfs_get_client);
438
439 /*
440 * Mark a server as ready or failed
441 */
442 void nfs_mark_client_ready(struct nfs_client *clp, int state)
443 {
444 smp_wmb();
445 clp->cl_cons_state = state;
446 wake_up_all(&nfs_client_active_wq);
447 }
448 EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
449
450 /*
451 * Initialise the timeout values for a connection
452 */
453 void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
454 int timeo, int retrans)
455 {
456 to->to_initval = timeo * HZ / 10;
457 to->to_retries = retrans;
458
459 switch (proto) {
460 case XPRT_TRANSPORT_TCP:
461 case XPRT_TRANSPORT_TCP_TLS:
462 case XPRT_TRANSPORT_RDMA:
463 if (retrans == NFS_UNSPEC_RETRANS)
464 to->to_retries = NFS_DEF_TCP_RETRANS;
465 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
466 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
467 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
468 to->to_initval = NFS_MAX_TCP_TIMEOUT;
469 to->to_increment = to->to_initval;
470 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
471 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
472 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
473 if (to->to_maxval < to->to_initval)
474 to->to_maxval = to->to_initval;
475 to->to_exponential = 0;
476 break;
477 case XPRT_TRANSPORT_UDP:
478 if (retrans == NFS_UNSPEC_RETRANS)
479 to->to_retries = NFS_DEF_UDP_RETRANS;
480 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
481 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
482 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
483 to->to_initval = NFS_MAX_UDP_TIMEOUT;
484 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
485 to->to_exponential = 1;
486 break;
487 default:
488 BUG();
489 }
490 }
491 EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
492
493 /*
494 * Create an RPC client handle
495 */
496 int nfs_create_rpc_client(struct nfs_client *clp,
497 const struct nfs_client_initdata *cl_init,
498 rpc_authflavor_t flavor)
499 {
500 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
501 struct rpc_clnt *clnt = NULL;
502 struct rpc_create_args args = {
503 .net = clp->cl_net,
504 .protocol = clp->cl_proto,
505 .nconnect = clp->cl_nconnect,
506 .address = (struct sockaddr *)&clp->cl_addr,
507 .addrsize = clp->cl_addrlen,
508 .timeout = cl_init->timeparms,
509 .servername = clp->cl_hostname,
510 .nodename = cl_init->nodename,
511 .program = &nfs_program,
512 .stats = &nn->rpcstats,
513 .version = clp->rpc_ops->version,
514 .authflavor = flavor,
515 .cred = cl_init->cred,
516 .xprtsec = cl_init->xprtsec,
517 .connect_timeout = cl_init->connect_timeout,
518 .reconnect_timeout = cl_init->reconnect_timeout,
519 };
520
521 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
522 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
523 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
524 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
525 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
526 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
527 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
528 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
529 if (test_bit(NFS_CS_NOPING, &clp->cl_flags))
530 args.flags |= RPC_CLNT_CREATE_NOPING;
531 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags))
532 args.flags |= RPC_CLNT_CREATE_REUSEPORT;
533
534 if (!IS_ERR(clp->cl_rpcclient))
535 return 0;
536
537 clnt = rpc_create(&args);
538 if (IS_ERR(clnt)) {
539 dprintk("%s: cannot create RPC client. Error = %ld\n",
540 __func__, PTR_ERR(clnt));
541 return PTR_ERR(clnt);
542 }
543
544 clnt->cl_principal = clp->cl_principal;
545 clp->cl_rpcclient = clnt;
546 clnt->cl_max_connect = clp->cl_max_connect;
547 return 0;
548 }
549 EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
550
551 /*
552 * Version 2 or 3 client destruction
553 */
554 static void nfs_destroy_server(struct nfs_server *server)
555 {
556 if (server->nlm_host)
557 nlmclnt_done(server->nlm_host);
558 }
559
560 /*
561 * Version 2 or 3 lockd setup
562 */
563 static int nfs_start_lockd(struct nfs_server *server)
564 {
565 struct nlm_host *host;
566 struct nfs_client *clp = server->nfs_client;
567 struct nlmclnt_initdata nlm_init = {
568 .hostname = clp->cl_hostname,
569 .address = (struct sockaddr *)&clp->cl_addr,
570 .addrlen = clp->cl_addrlen,
571 .nfs_version = clp->rpc_ops->version,
572 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
573 1 : 0,
574 .net = clp->cl_net,
575 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
576 .cred = server->cred,
577 };
578
579 if (nlm_init.nfs_version > 3)
580 return 0;
581 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
582 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
583 return 0;
584
585 switch (clp->cl_proto) {
586 default:
587 nlm_init.protocol = IPPROTO_TCP;
588 break;
589 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
590 case XPRT_TRANSPORT_UDP:
591 nlm_init.protocol = IPPROTO_UDP;
592 #endif
593 }
594
595 host = nlmclnt_init(&nlm_init);
596 if (IS_ERR(host))
597 return PTR_ERR(host);
598
599 server->nlm_host = host;
600 server->destroy = nfs_destroy_server;
601 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL);
602 return 0;
603 }
604
605 /*
606 * Create a general RPC client
607 */
608 int nfs_init_server_rpcclient(struct nfs_server *server,
609 const struct rpc_timeout *timeo,
610 rpc_authflavor_t pseudoflavour)
611 {
612 struct nfs_client *clp = server->nfs_client;
613
614 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
615 pseudoflavour);
616 if (IS_ERR(server->client)) {
617 dprintk("%s: couldn't create rpc_client!\n", __func__);
618 return PTR_ERR(server->client);
619 }
620
621 memcpy(&server->client->cl_timeout_default,
622 timeo,
623 sizeof(server->client->cl_timeout_default));
624 server->client->cl_timeout = &server->client->cl_timeout_default;
625 server->client->cl_softrtry = 0;
626 if (server->flags & NFS_MOUNT_SOFTERR)
627 server->client->cl_softerr = 1;
628 if (server->flags & NFS_MOUNT_SOFT)
629 server->client->cl_softrtry = 1;
630
631 nfs_sysfs_link_rpc_client(server, server->client, NULL);
632 return 0;
633 }
634 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
635
636 /**
637 * nfs_init_client - Initialise an NFS2 or NFS3 client
638 *
639 * @clp: nfs_client to initialise
640 * @cl_init: Initialisation parameters
641 *
642 * Returns pointer to an NFS client, or an ERR_PTR value.
643 */
644 struct nfs_client *nfs_init_client(struct nfs_client *clp,
645 const struct nfs_client_initdata *cl_init)
646 {
647 int error;
648
649 /* the client is already initialised */
650 if (clp->cl_cons_state == NFS_CS_READY)
651 return clp;
652
653 /*
654 * Create a client RPC handle for doing FSSTAT with UNIX auth only
655 * - RFC 2623, sec 2.3.2
656 */
657 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
658 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
659 if (error < 0) {
660 nfs_put_client(clp);
661 clp = ERR_PTR(error);
662 }
663 return clp;
664 }
665 EXPORT_SYMBOL_GPL(nfs_init_client);
666
667 /*
668 * Create a version 2 or 3 client
669 */
670 static int nfs_init_server(struct nfs_server *server,
671 const struct fs_context *fc)
672 {
673 const struct nfs_fs_context *ctx = nfs_fc2context(fc);
674 struct rpc_timeout timeparms;
675 struct nfs_client_initdata cl_init = {
676 .hostname = ctx->nfs_server.hostname,
677 .addr = &ctx->nfs_server._address,
678 .addrlen = ctx->nfs_server.addrlen,
679 .nfs_mod = ctx->nfs_mod,
680 .proto = ctx->nfs_server.protocol,
681 .net = fc->net_ns,
682 .timeparms = &timeparms,
683 .cred = server->cred,
684 .nconnect = ctx->nfs_server.nconnect,
685 .init_flags = (1UL << NFS_CS_REUSEPORT),
686 .xprtsec = ctx->xprtsec,
687 };
688 struct nfs_client *clp;
689 int error;
690
691 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
692 ctx->timeo, ctx->retrans);
693 if (ctx->flags & NFS_MOUNT_NORESVPORT)
694 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
695
696 /* Allocate or find a client reference we can use */
697 clp = nfs_get_client(&cl_init);
698 if (IS_ERR(clp))
699 return PTR_ERR(clp);
700
701 server->nfs_client = clp;
702 nfs_sysfs_add_server(server);
703 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state");
704
705 /* Initialise the client representation from the mount data */
706 server->flags = ctx->flags;
707 server->options = ctx->options;
708 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS;
709
710 switch (clp->rpc_ops->version) {
711 case 2:
712 server->fattr_valid = NFS_ATTR_FATTR_V2;
713 break;
714 case 3:
715 server->fattr_valid = NFS_ATTR_FATTR_V3;
716 break;
717 default:
718 server->fattr_valid = NFS_ATTR_FATTR_V4;
719 }
720
721 if (ctx->rsize)
722 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto);
723 if (ctx->wsize)
724 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto);
725
726 server->acregmin = ctx->acregmin * HZ;
727 server->acregmax = ctx->acregmax * HZ;
728 server->acdirmin = ctx->acdirmin * HZ;
729 server->acdirmax = ctx->acdirmax * HZ;
730
731 /* Start lockd here, before we might error out */
732 error = nfs_start_lockd(server);
733 if (error < 0)
734 goto error;
735
736 server->port = ctx->nfs_server.port;
737 server->auth_info = ctx->auth_info;
738
739 error = nfs_init_server_rpcclient(server, &timeparms,
740 ctx->selected_flavor);
741 if (error < 0)
742 goto error;
743
744 /* Preserve the values of mount_server-related mount options */
745 if (ctx->mount_server.addrlen) {
746 memcpy(&server->mountd_address, &ctx->mount_server.address,
747 ctx->mount_server.addrlen);
748 server->mountd_addrlen = ctx->mount_server.addrlen;
749 }
750 server->mountd_version = ctx->mount_server.version;
751 server->mountd_port = ctx->mount_server.port;
752 server->mountd_protocol = ctx->mount_server.protocol;
753
754 server->namelen = ctx->namlen;
755 return 0;
756
757 error:
758 server->nfs_client = NULL;
759 nfs_put_client(clp);
760 return error;
761 }
762
763 /*
764 * Load up the server record from information gained in an fsinfo record
765 */
766 static void nfs_server_set_fsinfo(struct nfs_server *server,
767 struct nfs_fsinfo *fsinfo)
768 {
769 struct nfs_client *clp = server->nfs_client;
770 unsigned long max_rpc_payload, raw_max_rpc_payload;
771
772 /* Work out a lot of parameters */
773 if (server->rsize == 0)
774 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto);
775 if (server->wsize == 0)
776 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto);
777
778 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
779 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto);
780 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
781 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto);
782
783 raw_max_rpc_payload = rpc_max_payload(server->client);
784 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL);
785
786 if (server->rsize > max_rpc_payload)
787 server->rsize = max_rpc_payload;
788 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
789 server->rsize = NFS_MAX_FILE_IO_SIZE;
790 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
791
792 if (server->wsize > max_rpc_payload)
793 server->wsize = max_rpc_payload;
794 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
795 server->wsize = NFS_MAX_FILE_IO_SIZE;
796 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
797
798 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
799
800 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
801 if (server->dtsize > NFS_MAX_FILE_IO_SIZE)
802 server->dtsize = NFS_MAX_FILE_IO_SIZE;
803 if (server->dtsize > server->rsize)
804 server->dtsize = server->rsize;
805
806 if (server->flags & NFS_MOUNT_NOAC) {
807 server->acregmin = server->acregmax = 0;
808 server->acdirmin = server->acdirmax = 0;
809 }
810
811 server->maxfilesize = fsinfo->maxfilesize;
812
813 server->time_delta = fsinfo->time_delta;
814 server->change_attr_type = fsinfo->change_attr_type;
815
816 server->clone_blksize = fsinfo->clone_blksize;
817 /* We're airborne Set socket buffersize */
818 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
819
820 #ifdef CONFIG_NFS_V4_2
821 /*
822 * Defaults until limited by the session parameters.
823 */
824 server->gxasize = min_t(unsigned int, raw_max_rpc_payload,
825 XATTR_SIZE_MAX);
826 server->sxasize = min_t(unsigned int, raw_max_rpc_payload,
827 XATTR_SIZE_MAX);
828 server->lxasize = min_t(unsigned int, raw_max_rpc_payload,
829 nfs42_listxattr_xdrsize(XATTR_LIST_MAX));
830
831 if (fsinfo->xattr_support)
832 server->caps |= NFS_CAP_XATTR;
833 #endif
834 }
835
836 /*
837 * Probe filesystem information, including the FSID on v2/v3
838 */
839 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
840 {
841 struct nfs_fsinfo fsinfo;
842 struct nfs_client *clp = server->nfs_client;
843 int error;
844
845 if (clp->rpc_ops->set_capabilities != NULL) {
846 error = clp->rpc_ops->set_capabilities(server, mntfh);
847 if (error < 0)
848 return error;
849 }
850
851 fsinfo.fattr = fattr;
852 fsinfo.nlayouttypes = 0;
853 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
854 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
855 if (error < 0)
856 return error;
857
858 nfs_server_set_fsinfo(server, &fsinfo);
859
860 /* Get some general file system info */
861 if (server->namelen == 0) {
862 struct nfs_pathconf pathinfo;
863
864 pathinfo.fattr = fattr;
865 nfs_fattr_init(fattr);
866
867 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
868 server->namelen = pathinfo.max_namelen;
869 }
870
871 if (clp->rpc_ops->discover_trunking != NULL &&
872 (server->caps & NFS_CAP_FS_LOCATIONS &&
873 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) {
874 error = clp->rpc_ops->discover_trunking(server, mntfh);
875 if (error < 0)
876 return error;
877 }
878
879 return 0;
880 }
881
882 /*
883 * Grab the destination's particulars, including lease expiry time.
884 *
885 * Returns zero if probe succeeded and retrieved FSID matches the FSID
886 * we have cached.
887 */
888 int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh)
889 {
890 struct nfs_fattr *fattr;
891 int error;
892
893 fattr = nfs_alloc_fattr();
894 if (fattr == NULL)
895 return -ENOMEM;
896
897 /* Sanity: the probe won't work if the destination server
898 * does not recognize the migrated FH. */
899 error = nfs_probe_fsinfo(server, mntfh, fattr);
900
901 nfs_free_fattr(fattr);
902 return error;
903 }
904 EXPORT_SYMBOL_GPL(nfs_probe_server);
905
906 /*
907 * Copy useful information when duplicating a server record
908 */
909 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
910 {
911 target->flags = source->flags;
912 target->rsize = source->rsize;
913 target->wsize = source->wsize;
914 target->acregmin = source->acregmin;
915 target->acregmax = source->acregmax;
916 target->acdirmin = source->acdirmin;
917 target->acdirmax = source->acdirmax;
918 target->caps = source->caps;
919 target->options = source->options;
920 target->auth_info = source->auth_info;
921 target->port = source->port;
922 }
923 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
924
925 void nfs_server_insert_lists(struct nfs_server *server)
926 {
927 struct nfs_client *clp = server->nfs_client;
928 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
929
930 spin_lock(&nn->nfs_client_lock);
931 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
932 list_add_tail(&server->master_link, &nn->nfs_volume_list);
933 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
934 spin_unlock(&nn->nfs_client_lock);
935
936 }
937 EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
938
939 void nfs_server_remove_lists(struct nfs_server *server)
940 {
941 struct nfs_client *clp = server->nfs_client;
942 struct nfs_net *nn;
943
944 if (clp == NULL)
945 return;
946 nn = net_generic(clp->cl_net, nfs_net_id);
947 spin_lock(&nn->nfs_client_lock);
948 list_del_rcu(&server->client_link);
949 if (list_empty(&clp->cl_superblocks))
950 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
951 list_del(&server->master_link);
952 spin_unlock(&nn->nfs_client_lock);
953
954 synchronize_rcu();
955 }
956 EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
957
958 static DEFINE_IDA(s_sysfs_ids);
959
960 /*
961 * Allocate and initialise a server record
962 */
963 struct nfs_server *nfs_alloc_server(void)
964 {
965 struct nfs_server *server;
966
967 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
968 if (!server)
969 return NULL;
970
971 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL);
972 if (server->s_sysfs_id < 0) {
973 kfree(server);
974 return NULL;
975 }
976
977 server->client = server->client_acl = ERR_PTR(-EINVAL);
978
979 /* Zero out the NFS state stuff */
980 INIT_LIST_HEAD(&server->client_link);
981 INIT_LIST_HEAD(&server->master_link);
982 INIT_LIST_HEAD(&server->delegations);
983 INIT_LIST_HEAD(&server->layouts);
984 INIT_LIST_HEAD(&server->state_owners_lru);
985 INIT_LIST_HEAD(&server->ss_copies);
986 INIT_LIST_HEAD(&server->ss_src_copies);
987
988 atomic_set(&server->active, 0);
989
990 server->io_stats = nfs_alloc_iostats();
991 if (!server->io_stats) {
992 kfree(server);
993 return NULL;
994 }
995
996 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
997
998 init_waitqueue_head(&server->write_congestion_wait);
999 atomic_long_set(&server->writeback, 0);
1000
1001 ida_init(&server->openowner_id);
1002 ida_init(&server->lockowner_id);
1003 pnfs_init_server(server);
1004 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
1005
1006 return server;
1007 }
1008 EXPORT_SYMBOL_GPL(nfs_alloc_server);
1009
1010 static void delayed_free(struct rcu_head *p)
1011 {
1012 struct nfs_server *server = container_of(p, struct nfs_server, rcu);
1013
1014 nfs_free_iostats(server->io_stats);
1015 kfree(server);
1016 }
1017
1018 /*
1019 * Free up a server record
1020 */
1021 void nfs_free_server(struct nfs_server *server)
1022 {
1023 nfs_server_remove_lists(server);
1024
1025 if (server->destroy != NULL)
1026 server->destroy(server);
1027
1028 if (!IS_ERR(server->client_acl))
1029 rpc_shutdown_client(server->client_acl);
1030 if (!IS_ERR(server->client))
1031 rpc_shutdown_client(server->client);
1032
1033 nfs_put_client(server->nfs_client);
1034
1035 if (server->kobj.state_initialized) {
1036 nfs_sysfs_remove_server(server);
1037 kobject_put(&server->kobj);
1038 }
1039 ida_free(&s_sysfs_ids, server->s_sysfs_id);
1040
1041 ida_destroy(&server->lockowner_id);
1042 ida_destroy(&server->openowner_id);
1043 put_cred(server->cred);
1044 nfs_release_automount_timer();
1045 call_rcu(&server->rcu, delayed_free);
1046 }
1047 EXPORT_SYMBOL_GPL(nfs_free_server);
1048
1049 /*
1050 * Create a version 2 or 3 volume record
1051 * - keyed on server and FSID
1052 */
1053 struct nfs_server *nfs_create_server(struct fs_context *fc)
1054 {
1055 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1056 struct nfs_server *server;
1057 struct nfs_fattr *fattr;
1058 int error;
1059
1060 server = nfs_alloc_server();
1061 if (!server)
1062 return ERR_PTR(-ENOMEM);
1063
1064 server->cred = get_cred(fc->cred);
1065
1066 error = -ENOMEM;
1067 fattr = nfs_alloc_fattr();
1068 if (fattr == NULL)
1069 goto error;
1070
1071 /* Get a client representation */
1072 error = nfs_init_server(server, fc);
1073 if (error < 0)
1074 goto error;
1075
1076 /* Probe the root fh to retrieve its FSID */
1077 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
1078 if (error < 0)
1079 goto error;
1080 if (server->nfs_client->rpc_ops->version == 3) {
1081 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1082 server->namelen = NFS3_MAXNAMLEN;
1083 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
1084 server->caps |= NFS_CAP_READDIRPLUS;
1085 } else {
1086 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1087 server->namelen = NFS2_MAXNAMLEN;
1088 }
1089
1090 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1091 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh,
1092 fattr, NULL);
1093 if (error < 0) {
1094 dprintk("nfs_create_server: getattr error = %d\n", -error);
1095 goto error;
1096 }
1097 }
1098 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1099
1100 dprintk("Server FSID: %llx:%llx\n",
1101 (unsigned long long) server->fsid.major,
1102 (unsigned long long) server->fsid.minor);
1103
1104 nfs_server_insert_lists(server);
1105 server->mount_time = jiffies;
1106 nfs_free_fattr(fattr);
1107 return server;
1108
1109 error:
1110 nfs_free_fattr(fattr);
1111 nfs_free_server(server);
1112 return ERR_PTR(error);
1113 }
1114 EXPORT_SYMBOL_GPL(nfs_create_server);
1115
1116 /*
1117 * Clone an NFS2, NFS3 or NFS4 server record
1118 */
1119 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1120 struct nfs_fh *fh,
1121 struct nfs_fattr *fattr,
1122 rpc_authflavor_t flavor)
1123 {
1124 struct nfs_server *server;
1125 int error;
1126
1127 server = nfs_alloc_server();
1128 if (!server)
1129 return ERR_PTR(-ENOMEM);
1130
1131 server->cred = get_cred(source->cred);
1132
1133 /* Copy data from the source */
1134 server->nfs_client = source->nfs_client;
1135 server->destroy = source->destroy;
1136 refcount_inc(&server->nfs_client->cl_count);
1137 nfs_server_copy_userdata(server, source);
1138
1139 server->fsid = fattr->fsid;
1140
1141 nfs_sysfs_add_server(server);
1142
1143 nfs_sysfs_link_rpc_client(server,
1144 server->nfs_client->cl_rpcclient, "_state");
1145
1146 error = nfs_init_server_rpcclient(server,
1147 source->client->cl_timeout,
1148 flavor);
1149 if (error < 0)
1150 goto out_free_server;
1151
1152 /* probe the filesystem info for this server filesystem */
1153 error = nfs_probe_server(server, fh);
1154 if (error < 0)
1155 goto out_free_server;
1156
1157 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1158 server->namelen = NFS4_MAXNAMLEN;
1159
1160 error = nfs_start_lockd(server);
1161 if (error < 0)
1162 goto out_free_server;
1163
1164 nfs_server_insert_lists(server);
1165 server->mount_time = jiffies;
1166
1167 return server;
1168
1169 out_free_server:
1170 nfs_free_server(server);
1171 return ERR_PTR(error);
1172 }
1173 EXPORT_SYMBOL_GPL(nfs_clone_server);
1174
1175 void nfs_clients_init(struct net *net)
1176 {
1177 struct nfs_net *nn = net_generic(net, nfs_net_id);
1178
1179 INIT_LIST_HEAD(&nn->nfs_client_list);
1180 INIT_LIST_HEAD(&nn->nfs_volume_list);
1181 #if IS_ENABLED(CONFIG_NFS_V4)
1182 idr_init(&nn->cb_ident_idr);
1183 #endif
1184 spin_lock_init(&nn->nfs_client_lock);
1185 nn->boot_time = ktime_get_real();
1186 memset(&nn->rpcstats, 0, sizeof(nn->rpcstats));
1187 nn->rpcstats.program = &nfs_program;
1188
1189 nfs_netns_sysfs_setup(nn, net);
1190 }
1191
1192 void nfs_clients_exit(struct net *net)
1193 {
1194 struct nfs_net *nn = net_generic(net, nfs_net_id);
1195
1196 nfs_netns_sysfs_destroy(nn);
1197 nfs_cleanup_cb_ident_idr(net);
1198 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
1199 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1200 }
1201
1202 #ifdef CONFIG_PROC_FS
1203 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1204 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1205 static void nfs_server_list_stop(struct seq_file *p, void *v);
1206 static int nfs_server_list_show(struct seq_file *m, void *v);
1207
1208 static const struct seq_operations nfs_server_list_ops = {
1209 .start = nfs_server_list_start,
1210 .next = nfs_server_list_next,
1211 .stop = nfs_server_list_stop,
1212 .show = nfs_server_list_show,
1213 };
1214
1215 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1216 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1217 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1218 static int nfs_volume_list_show(struct seq_file *m, void *v);
1219
1220 static const struct seq_operations nfs_volume_list_ops = {
1221 .start = nfs_volume_list_start,
1222 .next = nfs_volume_list_next,
1223 .stop = nfs_volume_list_stop,
1224 .show = nfs_volume_list_show,
1225 };
1226
1227 /*
1228 * set up the iterator to start reading from the server list and return the first item
1229 */
1230 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1231 __acquires(&nn->nfs_client_lock)
1232 {
1233 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1234
1235 /* lock the list against modification */
1236 spin_lock(&nn->nfs_client_lock);
1237 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1238 }
1239
1240 /*
1241 * move to next server
1242 */
1243 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1244 {
1245 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1246
1247 return seq_list_next(v, &nn->nfs_client_list, pos);
1248 }
1249
1250 /*
1251 * clean up after reading from the transports list
1252 */
1253 static void nfs_server_list_stop(struct seq_file *p, void *v)
1254 __releases(&nn->nfs_client_lock)
1255 {
1256 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1257
1258 spin_unlock(&nn->nfs_client_lock);
1259 }
1260
1261 /*
1262 * display a header line followed by a load of call lines
1263 */
1264 static int nfs_server_list_show(struct seq_file *m, void *v)
1265 {
1266 struct nfs_client *clp;
1267 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1268
1269 /* display header on line 1 */
1270 if (v == &nn->nfs_client_list) {
1271 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1272 return 0;
1273 }
1274
1275 /* display one transport per line on subsequent lines */
1276 clp = list_entry(v, struct nfs_client, cl_share_link);
1277
1278 /* Check if the client is initialized */
1279 if (clp->cl_cons_state != NFS_CS_READY)
1280 return 0;
1281
1282 rcu_read_lock();
1283 seq_printf(m, "v%u %s %s %3d %s\n",
1284 clp->rpc_ops->version,
1285 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1286 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1287 refcount_read(&clp->cl_count),
1288 clp->cl_hostname);
1289 rcu_read_unlock();
1290
1291 return 0;
1292 }
1293
1294 /*
1295 * set up the iterator to start reading from the volume list and return the first item
1296 */
1297 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1298 __acquires(&nn->nfs_client_lock)
1299 {
1300 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1301
1302 /* lock the list against modification */
1303 spin_lock(&nn->nfs_client_lock);
1304 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1305 }
1306
1307 /*
1308 * move to next volume
1309 */
1310 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1311 {
1312 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1313
1314 return seq_list_next(v, &nn->nfs_volume_list, pos);
1315 }
1316
1317 /*
1318 * clean up after reading from the transports list
1319 */
1320 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1321 __releases(&nn->nfs_client_lock)
1322 {
1323 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1324
1325 spin_unlock(&nn->nfs_client_lock);
1326 }
1327
1328 /*
1329 * display a header line followed by a load of call lines
1330 */
1331 static int nfs_volume_list_show(struct seq_file *m, void *v)
1332 {
1333 struct nfs_server *server;
1334 struct nfs_client *clp;
1335 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1336 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1337 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1338
1339 /* display header on line 1 */
1340 if (v == &nn->nfs_volume_list) {
1341 seq_puts(m, "NV SERVER PORT DEV FSID"
1342 " FSC\n");
1343 return 0;
1344 }
1345 /* display one transport per line on subsequent lines */
1346 server = list_entry(v, struct nfs_server, master_link);
1347 clp = server->nfs_client;
1348
1349 snprintf(dev, sizeof(dev), "%u:%u",
1350 MAJOR(server->s_dev), MINOR(server->s_dev));
1351
1352 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1353 (unsigned long long) server->fsid.major,
1354 (unsigned long long) server->fsid.minor);
1355
1356 rcu_read_lock();
1357 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1358 clp->rpc_ops->version,
1359 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1360 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1361 dev,
1362 fsid,
1363 nfs_server_fscache_state(server));
1364 rcu_read_unlock();
1365
1366 return 0;
1367 }
1368
1369 int nfs_fs_proc_net_init(struct net *net)
1370 {
1371 struct nfs_net *nn = net_generic(net, nfs_net_id);
1372 struct proc_dir_entry *p;
1373
1374 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1375 if (!nn->proc_nfsfs)
1376 goto error_0;
1377
1378 /* a file of servers with which we're dealing */
1379 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1380 &nfs_server_list_ops, sizeof(struct seq_net_private));
1381 if (!p)
1382 goto error_1;
1383
1384 /* a file of volumes that we have mounted */
1385 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1386 &nfs_volume_list_ops, sizeof(struct seq_net_private));
1387 if (!p)
1388 goto error_1;
1389 return 0;
1390
1391 error_1:
1392 remove_proc_subtree("nfsfs", net->proc_net);
1393 error_0:
1394 return -ENOMEM;
1395 }
1396
1397 void nfs_fs_proc_net_exit(struct net *net)
1398 {
1399 remove_proc_subtree("nfsfs", net->proc_net);
1400 }
1401
1402 /*
1403 * initialise the /proc/fs/nfsfs/ directory
1404 */
1405 int __init nfs_fs_proc_init(void)
1406 {
1407 if (!proc_mkdir("fs/nfsfs", NULL))
1408 goto error_0;
1409
1410 /* a file of servers with which we're dealing */
1411 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1412 goto error_1;
1413
1414 /* a file of volumes that we have mounted */
1415 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1416 goto error_1;
1417
1418 return 0;
1419 error_1:
1420 remove_proc_subtree("fs/nfsfs", NULL);
1421 error_0:
1422 return -ENOMEM;
1423 }
1424
1425 /*
1426 * clean up the /proc/fs/nfsfs/ directory
1427 */
1428 void nfs_fs_proc_exit(void)
1429 {
1430 remove_proc_subtree("fs/nfsfs", NULL);
1431 ida_destroy(&s_sysfs_ids);
1432 }
1433
1434 #endif /* CONFIG_PROC_FS */
1435
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