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