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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 atomic_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 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
244
245 nfs_fscache_release_client_cookie(clp);
246
247 /* -EIO all pending I/O */
248 if (!IS_ERR(clp->cl_rpcclient))
249 rpc_shutdown_client(clp->cl_rpcclient);
250
251 if (clp->cl_machine_cred != NULL)
252 put_rpccred(clp->cl_machine_cred);
253
254 put_net(clp->cl_net);
255 put_nfs_version(clp->cl_nfs_mod);
256 kfree(clp->cl_hostname);
257 kfree(clp->cl_acceptor);
258 kfree(clp);
259
260 dprintk("<-- nfs_free_client()\n");
261}
262EXPORT_SYMBOL_GPL(nfs_free_client);
263
264/*
265 * Release a reference to a shared client record
266 */
267void nfs_put_client(struct nfs_client *clp)
268{
269 struct nfs_net *nn;
270
271 if (!clp)
272 return;
273
274 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
275 nn = net_generic(clp->cl_net, nfs_net_id);
276
277 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
278 list_del(&clp->cl_share_link);
279 nfs_cb_idr_remove_locked(clp);
280 spin_unlock(&nn->nfs_client_lock);
281
282 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
283
284 clp->rpc_ops->free_client(clp);
285 }
286}
287EXPORT_SYMBOL_GPL(nfs_put_client);
288
289/*
290 * Find an nfs_client on the list that matches the initialisation data
291 * that is supplied.
292 */
293static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
294{
295 struct nfs_client *clp;
296 const struct sockaddr *sap = data->addr;
297 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
298
299 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
300 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
301 /* Don't match clients that failed to initialise properly */
302 if (clp->cl_cons_state < 0)
303 continue;
304
305 /* Different NFS versions cannot share the same nfs_client */
306 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
307 continue;
308
309 if (clp->cl_proto != data->proto)
310 continue;
311 /* Match nfsv4 minorversion */
312 if (clp->cl_minorversion != data->minorversion)
313 continue;
314 /* Match the full socket address */
315 if (!rpc_cmp_addr_port(sap, clap))
316 continue;
317
318 atomic_inc(&clp->cl_count);
319 return clp;
320 }
321 return NULL;
322}
323
324static bool nfs_client_init_is_complete(const struct nfs_client *clp)
325{
326 return clp->cl_cons_state <= NFS_CS_READY;
327}
328
329int nfs_wait_client_init_complete(const struct nfs_client *clp)
330{
331 return wait_event_killable(nfs_client_active_wq,
332 nfs_client_init_is_complete(clp));
333}
334EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
335
336/*
337 * Found an existing client. Make sure it's ready before returning.
338 */
339static struct nfs_client *
340nfs_found_client(const struct nfs_client_initdata *cl_init,
341 struct nfs_client *clp)
342{
343 int error;
344
345 error = nfs_wait_client_init_complete(clp);
346 if (error < 0) {
347 nfs_put_client(clp);
348 return ERR_PTR(-ERESTARTSYS);
349 }
350
351 if (clp->cl_cons_state < NFS_CS_READY) {
352 error = clp->cl_cons_state;
353 nfs_put_client(clp);
354 return ERR_PTR(error);
355 }
356
357 smp_rmb();
358
359 dprintk("<-- %s found nfs_client %p for %s\n",
360 __func__, clp, cl_init->hostname ?: "");
361 return clp;
362}
363
364/*
365 * Look up a client by IP address and protocol version
366 * - creates a new record if one doesn't yet exist
367 */
368struct nfs_client *
369nfs_get_client(const struct nfs_client_initdata *cl_init,
370 const struct rpc_timeout *timeparms,
371 const char *ip_addr,
372 rpc_authflavor_t authflavour)
373{
374 struct nfs_client *clp, *new = NULL;
375 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
376 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
377
378 if (cl_init->hostname == NULL) {
379 WARN_ON(1);
380 return NULL;
381 }
382
383 dprintk("--> nfs_get_client(%s,v%u)\n",
384 cl_init->hostname, rpc_ops->version);
385
386 /* see if the client already exists */
387 do {
388 spin_lock(&nn->nfs_client_lock);
389
390 clp = nfs_match_client(cl_init);
391 if (clp) {
392 spin_unlock(&nn->nfs_client_lock);
393 if (new)
394 new->rpc_ops->free_client(new);
395 return nfs_found_client(cl_init, clp);
396 }
397 if (new) {
398 list_add_tail(&new->cl_share_link,
399 &nn->nfs_client_list);
400 spin_unlock(&nn->nfs_client_lock);
401 new->cl_flags = cl_init->init_flags;
402 return rpc_ops->init_client(new, timeparms, ip_addr);
403 }
404
405 spin_unlock(&nn->nfs_client_lock);
406
407 new = rpc_ops->alloc_client(cl_init);
408 } while (!IS_ERR(new));
409
410 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
411 cl_init->hostname, PTR_ERR(new));
412 return new;
413}
414EXPORT_SYMBOL_GPL(nfs_get_client);
415
416/*
417 * Mark a server as ready or failed
418 */
419void nfs_mark_client_ready(struct nfs_client *clp, int state)
420{
421 smp_wmb();
422 clp->cl_cons_state = state;
423 wake_up_all(&nfs_client_active_wq);
424}
425EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
426
427/*
428 * Initialise the timeout values for a connection
429 */
430void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
431 unsigned int timeo, unsigned int retrans)
432{
433 to->to_initval = timeo * HZ / 10;
434 to->to_retries = retrans;
435
436 switch (proto) {
437 case XPRT_TRANSPORT_TCP:
438 case XPRT_TRANSPORT_RDMA:
439 if (to->to_retries == 0)
440 to->to_retries = NFS_DEF_TCP_RETRANS;
441 if (to->to_initval == 0)
442 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
443 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
444 to->to_initval = NFS_MAX_TCP_TIMEOUT;
445 to->to_increment = to->to_initval;
446 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
447 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
448 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
449 if (to->to_maxval < to->to_initval)
450 to->to_maxval = to->to_initval;
451 to->to_exponential = 0;
452 break;
453 case XPRT_TRANSPORT_UDP:
454 if (to->to_retries == 0)
455 to->to_retries = NFS_DEF_UDP_RETRANS;
456 if (!to->to_initval)
457 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
458 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
459 to->to_initval = NFS_MAX_UDP_TIMEOUT;
460 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
461 to->to_exponential = 1;
462 break;
463 default:
464 BUG();
465 }
466}
467EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
468
469/*
470 * Create an RPC client handle
471 */
472int nfs_create_rpc_client(struct nfs_client *clp,
473 const struct rpc_timeout *timeparms,
474 rpc_authflavor_t flavor)
475{
476 struct rpc_clnt *clnt = NULL;
477 struct rpc_create_args args = {
478 .net = clp->cl_net,
479 .protocol = clp->cl_proto,
480 .address = (struct sockaddr *)&clp->cl_addr,
481 .addrsize = clp->cl_addrlen,
482 .timeout = timeparms,
483 .servername = clp->cl_hostname,
484 .program = &nfs_program,
485 .version = clp->rpc_ops->version,
486 .authflavor = flavor,
487 };
488
489 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
490 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
491 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
492 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
493 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
494 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
495 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
496 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
497
498 if (!IS_ERR(clp->cl_rpcclient))
499 return 0;
500
501 clnt = rpc_create(&args);
502 if (IS_ERR(clnt)) {
503 dprintk("%s: cannot create RPC client. Error = %ld\n",
504 __func__, PTR_ERR(clnt));
505 return PTR_ERR(clnt);
506 }
507
508 clp->cl_rpcclient = clnt;
509 return 0;
510}
511EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
512
513/*
514 * Version 2 or 3 client destruction
515 */
516static void nfs_destroy_server(struct nfs_server *server)
517{
518 if (server->nlm_host)
519 nlmclnt_done(server->nlm_host);
520}
521
522/*
523 * Version 2 or 3 lockd setup
524 */
525static int nfs_start_lockd(struct nfs_server *server)
526{
527 struct nlm_host *host;
528 struct nfs_client *clp = server->nfs_client;
529 struct nlmclnt_initdata nlm_init = {
530 .hostname = clp->cl_hostname,
531 .address = (struct sockaddr *)&clp->cl_addr,
532 .addrlen = clp->cl_addrlen,
533 .nfs_version = clp->rpc_ops->version,
534 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
535 1 : 0,
536 .net = clp->cl_net,
537 };
538
539 if (nlm_init.nfs_version > 3)
540 return 0;
541 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
542 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
543 return 0;
544
545 switch (clp->cl_proto) {
546 default:
547 nlm_init.protocol = IPPROTO_TCP;
548 break;
549 case XPRT_TRANSPORT_UDP:
550 nlm_init.protocol = IPPROTO_UDP;
551 }
552
553 host = nlmclnt_init(&nlm_init);
554 if (IS_ERR(host))
555 return PTR_ERR(host);
556
557 server->nlm_host = host;
558 server->destroy = nfs_destroy_server;
559 return 0;
560}
561
562/*
563 * Create a general RPC client
564 */
565int nfs_init_server_rpcclient(struct nfs_server *server,
566 const struct rpc_timeout *timeo,
567 rpc_authflavor_t pseudoflavour)
568{
569 struct nfs_client *clp = server->nfs_client;
570
571 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
572 pseudoflavour);
573 if (IS_ERR(server->client)) {
574 dprintk("%s: couldn't create rpc_client!\n", __func__);
575 return PTR_ERR(server->client);
576 }
577
578 memcpy(&server->client->cl_timeout_default,
579 timeo,
580 sizeof(server->client->cl_timeout_default));
581 server->client->cl_timeout = &server->client->cl_timeout_default;
582 server->client->cl_softrtry = 0;
583 if (server->flags & NFS_MOUNT_SOFT)
584 server->client->cl_softrtry = 1;
585
586 return 0;
587}
588EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
589
590/**
591 * nfs_init_client - Initialise an NFS2 or NFS3 client
592 *
593 * @clp: nfs_client to initialise
594 * @timeparms: timeout parameters for underlying RPC transport
595 * @ip_addr: IP presentation address (not used)
596 *
597 * Returns pointer to an NFS client, or an ERR_PTR value.
598 */
599struct nfs_client *nfs_init_client(struct nfs_client *clp,
600 const struct rpc_timeout *timeparms,
601 const char *ip_addr)
602{
603 int error;
604
605 if (clp->cl_cons_state == NFS_CS_READY) {
606 /* the client is already initialised */
607 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
608 return clp;
609 }
610
611 /*
612 * Create a client RPC handle for doing FSSTAT with UNIX auth only
613 * - RFC 2623, sec 2.3.2
614 */
615 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
616 if (error < 0)
617 goto error;
618 nfs_mark_client_ready(clp, NFS_CS_READY);
619 return clp;
620
621error:
622 nfs_mark_client_ready(clp, error);
623 nfs_put_client(clp);
624 dprintk("<-- nfs_init_client() = xerror %d\n", error);
625 return ERR_PTR(error);
626}
627EXPORT_SYMBOL_GPL(nfs_init_client);
628
629/*
630 * Create a version 2 or 3 client
631 */
632static int nfs_init_server(struct nfs_server *server,
633 const struct nfs_parsed_mount_data *data,
634 struct nfs_subversion *nfs_mod)
635{
636 struct nfs_client_initdata cl_init = {
637 .hostname = data->nfs_server.hostname,
638 .addr = (const struct sockaddr *)&data->nfs_server.address,
639 .addrlen = data->nfs_server.addrlen,
640 .nfs_mod = nfs_mod,
641 .proto = data->nfs_server.protocol,
642 .net = data->net,
643 };
644 struct rpc_timeout timeparms;
645 struct nfs_client *clp;
646 int error;
647
648 dprintk("--> nfs_init_server()\n");
649
650 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
651 data->timeo, data->retrans);
652 if (data->flags & NFS_MOUNT_NORESVPORT)
653 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
654
655 /* Allocate or find a client reference we can use */
656 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX);
657 if (IS_ERR(clp)) {
658 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
659 return PTR_ERR(clp);
660 }
661
662 server->nfs_client = clp;
663
664 /* Initialise the client representation from the mount data */
665 server->flags = data->flags;
666 server->options = data->options;
667 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
668 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
669 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
670
671 if (data->rsize)
672 server->rsize = nfs_block_size(data->rsize, NULL);
673 if (data->wsize)
674 server->wsize = nfs_block_size(data->wsize, NULL);
675
676 server->acregmin = data->acregmin * HZ;
677 server->acregmax = data->acregmax * HZ;
678 server->acdirmin = data->acdirmin * HZ;
679 server->acdirmax = data->acdirmax * HZ;
680
681 /* Start lockd here, before we might error out */
682 error = nfs_start_lockd(server);
683 if (error < 0)
684 goto error;
685
686 server->port = data->nfs_server.port;
687 server->auth_info = data->auth_info;
688
689 error = nfs_init_server_rpcclient(server, &timeparms,
690 data->selected_flavor);
691 if (error < 0)
692 goto error;
693
694 /* Preserve the values of mount_server-related mount options */
695 if (data->mount_server.addrlen) {
696 memcpy(&server->mountd_address, &data->mount_server.address,
697 data->mount_server.addrlen);
698 server->mountd_addrlen = data->mount_server.addrlen;
699 }
700 server->mountd_version = data->mount_server.version;
701 server->mountd_port = data->mount_server.port;
702 server->mountd_protocol = data->mount_server.protocol;
703
704 server->namelen = data->namlen;
705 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
706 return 0;
707
708error:
709 server->nfs_client = NULL;
710 nfs_put_client(clp);
711 dprintk("<-- nfs_init_server() = xerror %d\n", error);
712 return error;
713}
714
715/*
716 * Load up the server record from information gained in an fsinfo record
717 */
718static void nfs_server_set_fsinfo(struct nfs_server *server,
719 struct nfs_fsinfo *fsinfo)
720{
721 unsigned long max_rpc_payload;
722
723 /* Work out a lot of parameters */
724 if (server->rsize == 0)
725 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
726 if (server->wsize == 0)
727 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
728
729 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
730 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
731 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
732 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
733
734 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
735 if (server->rsize > max_rpc_payload)
736 server->rsize = max_rpc_payload;
737 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
738 server->rsize = NFS_MAX_FILE_IO_SIZE;
739 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
740
741 server->backing_dev_info.name = "nfs";
742 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
743
744 if (server->wsize > max_rpc_payload)
745 server->wsize = max_rpc_payload;
746 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
747 server->wsize = NFS_MAX_FILE_IO_SIZE;
748 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
749
750 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
751
752 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
753 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES)
754 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES;
755 if (server->dtsize > server->rsize)
756 server->dtsize = server->rsize;
757
758 if (server->flags & NFS_MOUNT_NOAC) {
759 server->acregmin = server->acregmax = 0;
760 server->acdirmin = server->acdirmax = 0;
761 }
762
763 server->maxfilesize = fsinfo->maxfilesize;
764
765 server->time_delta = fsinfo->time_delta;
766
767 server->clone_blksize = fsinfo->clone_blksize;
768 /* We're airborne Set socket buffersize */
769 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
770}
771
772/*
773 * Probe filesystem information, including the FSID on v2/v3
774 */
775int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
776{
777 struct nfs_fsinfo fsinfo;
778 struct nfs_client *clp = server->nfs_client;
779 int error;
780
781 dprintk("--> nfs_probe_fsinfo()\n");
782
783 if (clp->rpc_ops->set_capabilities != NULL) {
784 error = clp->rpc_ops->set_capabilities(server, mntfh);
785 if (error < 0)
786 goto out_error;
787 }
788
789 fsinfo.fattr = fattr;
790 fsinfo.layouttype = 0;
791 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
792 if (error < 0)
793 goto out_error;
794
795 nfs_server_set_fsinfo(server, &fsinfo);
796
797 /* Get some general file system info */
798 if (server->namelen == 0) {
799 struct nfs_pathconf pathinfo;
800
801 pathinfo.fattr = fattr;
802 nfs_fattr_init(fattr);
803
804 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
805 server->namelen = pathinfo.max_namelen;
806 }
807
808 dprintk("<-- nfs_probe_fsinfo() = 0\n");
809 return 0;
810
811out_error:
812 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
813 return error;
814}
815EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
816
817/*
818 * Copy useful information when duplicating a server record
819 */
820void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
821{
822 target->flags = source->flags;
823 target->rsize = source->rsize;
824 target->wsize = source->wsize;
825 target->acregmin = source->acregmin;
826 target->acregmax = source->acregmax;
827 target->acdirmin = source->acdirmin;
828 target->acdirmax = source->acdirmax;
829 target->caps = source->caps;
830 target->options = source->options;
831 target->auth_info = source->auth_info;
832}
833EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
834
835void nfs_server_insert_lists(struct nfs_server *server)
836{
837 struct nfs_client *clp = server->nfs_client;
838 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
839
840 spin_lock(&nn->nfs_client_lock);
841 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
842 list_add_tail(&server->master_link, &nn->nfs_volume_list);
843 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
844 spin_unlock(&nn->nfs_client_lock);
845
846}
847EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
848
849void nfs_server_remove_lists(struct nfs_server *server)
850{
851 struct nfs_client *clp = server->nfs_client;
852 struct nfs_net *nn;
853
854 if (clp == NULL)
855 return;
856 nn = net_generic(clp->cl_net, nfs_net_id);
857 spin_lock(&nn->nfs_client_lock);
858 list_del_rcu(&server->client_link);
859 if (list_empty(&clp->cl_superblocks))
860 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
861 list_del(&server->master_link);
862 spin_unlock(&nn->nfs_client_lock);
863
864 synchronize_rcu();
865}
866EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
867
868/*
869 * Allocate and initialise a server record
870 */
871struct nfs_server *nfs_alloc_server(void)
872{
873 struct nfs_server *server;
874
875 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
876 if (!server)
877 return NULL;
878
879 server->client = server->client_acl = ERR_PTR(-EINVAL);
880
881 /* Zero out the NFS state stuff */
882 INIT_LIST_HEAD(&server->client_link);
883 INIT_LIST_HEAD(&server->master_link);
884 INIT_LIST_HEAD(&server->delegations);
885 INIT_LIST_HEAD(&server->layouts);
886 INIT_LIST_HEAD(&server->state_owners_lru);
887
888 atomic_set(&server->active, 0);
889
890 server->io_stats = nfs_alloc_iostats();
891 if (!server->io_stats) {
892 kfree(server);
893 return NULL;
894 }
895
896 if (bdi_init(&server->backing_dev_info)) {
897 nfs_free_iostats(server->io_stats);
898 kfree(server);
899 return NULL;
900 }
901
902 ida_init(&server->openowner_id);
903 ida_init(&server->lockowner_id);
904 pnfs_init_server(server);
905
906 return server;
907}
908EXPORT_SYMBOL_GPL(nfs_alloc_server);
909
910/*
911 * Free up a server record
912 */
913void nfs_free_server(struct nfs_server *server)
914{
915 dprintk("--> nfs_free_server()\n");
916
917 nfs_server_remove_lists(server);
918
919 if (server->destroy != NULL)
920 server->destroy(server);
921
922 if (!IS_ERR(server->client_acl))
923 rpc_shutdown_client(server->client_acl);
924 if (!IS_ERR(server->client))
925 rpc_shutdown_client(server->client);
926
927 nfs_put_client(server->nfs_client);
928
929 ida_destroy(&server->lockowner_id);
930 ida_destroy(&server->openowner_id);
931 nfs_free_iostats(server->io_stats);
932 bdi_destroy(&server->backing_dev_info);
933 kfree(server);
934 nfs_release_automount_timer();
935 dprintk("<-- nfs_free_server()\n");
936}
937EXPORT_SYMBOL_GPL(nfs_free_server);
938
939/*
940 * Create a version 2 or 3 volume record
941 * - keyed on server and FSID
942 */
943struct 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 error = -ENOMEM;
955 fattr = nfs_alloc_fattr();
956 if (fattr == NULL)
957 goto error;
958
959 /* Get a client representation */
960 error = nfs_init_server(server, mount_info->parsed, nfs_mod);
961 if (error < 0)
962 goto error;
963
964 /* Probe the root fh to retrieve its FSID */
965 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
966 if (error < 0)
967 goto error;
968 if (server->nfs_client->rpc_ops->version == 3) {
969 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
970 server->namelen = NFS3_MAXNAMLEN;
971 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
972 server->caps |= NFS_CAP_READDIRPLUS;
973 } else {
974 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
975 server->namelen = NFS2_MAXNAMLEN;
976 }
977
978 if (!(fattr->valid & NFS_ATTR_FATTR)) {
979 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
980 if (error < 0) {
981 dprintk("nfs_create_server: getattr error = %d\n", -error);
982 goto error;
983 }
984 }
985 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
986
987 dprintk("Server FSID: %llx:%llx\n",
988 (unsigned long long) server->fsid.major,
989 (unsigned long long) server->fsid.minor);
990
991 nfs_server_insert_lists(server);
992 server->mount_time = jiffies;
993 nfs_free_fattr(fattr);
994 return server;
995
996error:
997 nfs_free_fattr(fattr);
998 nfs_free_server(server);
999 return ERR_PTR(error);
1000}
1001EXPORT_SYMBOL_GPL(nfs_create_server);
1002
1003/*
1004 * Clone an NFS2, NFS3 or NFS4 server record
1005 */
1006struct nfs_server *nfs_clone_server(struct nfs_server *source,
1007 struct nfs_fh *fh,
1008 struct nfs_fattr *fattr,
1009 rpc_authflavor_t flavor)
1010{
1011 struct nfs_server *server;
1012 struct nfs_fattr *fattr_fsinfo;
1013 int error;
1014
1015 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1016 (unsigned long long) fattr->fsid.major,
1017 (unsigned long long) fattr->fsid.minor);
1018
1019 server = nfs_alloc_server();
1020 if (!server)
1021 return ERR_PTR(-ENOMEM);
1022
1023 error = -ENOMEM;
1024 fattr_fsinfo = nfs_alloc_fattr();
1025 if (fattr_fsinfo == NULL)
1026 goto out_free_server;
1027
1028 /* Copy data from the source */
1029 server->nfs_client = source->nfs_client;
1030 server->destroy = source->destroy;
1031 atomic_inc(&server->nfs_client->cl_count);
1032 nfs_server_copy_userdata(server, source);
1033
1034 server->fsid = fattr->fsid;
1035
1036 error = nfs_init_server_rpcclient(server,
1037 source->client->cl_timeout,
1038 flavor);
1039 if (error < 0)
1040 goto out_free_server;
1041
1042 /* probe the filesystem info for this server filesystem */
1043 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1044 if (error < 0)
1045 goto out_free_server;
1046
1047 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1048 server->namelen = NFS4_MAXNAMLEN;
1049
1050 dprintk("Cloned FSID: %llx:%llx\n",
1051 (unsigned long long) server->fsid.major,
1052 (unsigned long long) server->fsid.minor);
1053
1054 error = nfs_start_lockd(server);
1055 if (error < 0)
1056 goto out_free_server;
1057
1058 nfs_server_insert_lists(server);
1059 server->mount_time = jiffies;
1060
1061 nfs_free_fattr(fattr_fsinfo);
1062 dprintk("<-- nfs_clone_server() = %p\n", server);
1063 return server;
1064
1065out_free_server:
1066 nfs_free_fattr(fattr_fsinfo);
1067 nfs_free_server(server);
1068 dprintk("<-- nfs_clone_server() = error %d\n", error);
1069 return ERR_PTR(error);
1070}
1071EXPORT_SYMBOL_GPL(nfs_clone_server);
1072
1073void nfs_clients_init(struct net *net)
1074{
1075 struct nfs_net *nn = net_generic(net, nfs_net_id);
1076
1077 INIT_LIST_HEAD(&nn->nfs_client_list);
1078 INIT_LIST_HEAD(&nn->nfs_volume_list);
1079#if IS_ENABLED(CONFIG_NFS_V4)
1080 idr_init(&nn->cb_ident_idr);
1081#endif
1082 spin_lock_init(&nn->nfs_client_lock);
1083 nn->boot_time = CURRENT_TIME;
1084}
1085
1086#ifdef CONFIG_PROC_FS
1087static int nfs_server_list_open(struct inode *inode, struct file *file);
1088static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1089static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1090static void nfs_server_list_stop(struct seq_file *p, void *v);
1091static int nfs_server_list_show(struct seq_file *m, void *v);
1092
1093static const struct seq_operations nfs_server_list_ops = {
1094 .start = nfs_server_list_start,
1095 .next = nfs_server_list_next,
1096 .stop = nfs_server_list_stop,
1097 .show = nfs_server_list_show,
1098};
1099
1100static const struct file_operations nfs_server_list_fops = {
1101 .open = nfs_server_list_open,
1102 .read = seq_read,
1103 .llseek = seq_lseek,
1104 .release = seq_release_net,
1105 .owner = THIS_MODULE,
1106};
1107
1108static int nfs_volume_list_open(struct inode *inode, struct file *file);
1109static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1110static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1111static void nfs_volume_list_stop(struct seq_file *p, void *v);
1112static int nfs_volume_list_show(struct seq_file *m, void *v);
1113
1114static const struct seq_operations nfs_volume_list_ops = {
1115 .start = nfs_volume_list_start,
1116 .next = nfs_volume_list_next,
1117 .stop = nfs_volume_list_stop,
1118 .show = nfs_volume_list_show,
1119};
1120
1121static const struct file_operations nfs_volume_list_fops = {
1122 .open = nfs_volume_list_open,
1123 .read = seq_read,
1124 .llseek = seq_lseek,
1125 .release = seq_release_net,
1126 .owner = THIS_MODULE,
1127};
1128
1129/*
1130 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1131 * we're dealing
1132 */
1133static int nfs_server_list_open(struct inode *inode, struct file *file)
1134{
1135 return seq_open_net(inode, file, &nfs_server_list_ops,
1136 sizeof(struct seq_net_private));
1137}
1138
1139/*
1140 * set up the iterator to start reading from the server list and return the first item
1141 */
1142static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1143 __acquires(&nn->nfs_client_lock)
1144{
1145 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1146
1147 /* lock the list against modification */
1148 spin_lock(&nn->nfs_client_lock);
1149 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1150}
1151
1152/*
1153 * move to next server
1154 */
1155static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1156{
1157 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1158
1159 return seq_list_next(v, &nn->nfs_client_list, pos);
1160}
1161
1162/*
1163 * clean up after reading from the transports list
1164 */
1165static void nfs_server_list_stop(struct seq_file *p, void *v)
1166 __releases(&nn->nfs_client_lock)
1167{
1168 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1169
1170 spin_unlock(&nn->nfs_client_lock);
1171}
1172
1173/*
1174 * display a header line followed by a load of call lines
1175 */
1176static int nfs_server_list_show(struct seq_file *m, void *v)
1177{
1178 struct nfs_client *clp;
1179 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1180
1181 /* display header on line 1 */
1182 if (v == &nn->nfs_client_list) {
1183 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1184 return 0;
1185 }
1186
1187 /* display one transport per line on subsequent lines */
1188 clp = list_entry(v, struct nfs_client, cl_share_link);
1189
1190 /* Check if the client is initialized */
1191 if (clp->cl_cons_state != NFS_CS_READY)
1192 return 0;
1193
1194 rcu_read_lock();
1195 seq_printf(m, "v%u %s %s %3d %s\n",
1196 clp->rpc_ops->version,
1197 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1198 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1199 atomic_read(&clp->cl_count),
1200 clp->cl_hostname);
1201 rcu_read_unlock();
1202
1203 return 0;
1204}
1205
1206/*
1207 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1208 */
1209static int nfs_volume_list_open(struct inode *inode, struct file *file)
1210{
1211 return seq_open_net(inode, file, &nfs_volume_list_ops,
1212 sizeof(struct seq_net_private));
1213}
1214
1215/*
1216 * set up the iterator to start reading from the volume list and return the first item
1217 */
1218static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1219 __acquires(&nn->nfs_client_lock)
1220{
1221 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1222
1223 /* lock the list against modification */
1224 spin_lock(&nn->nfs_client_lock);
1225 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1226}
1227
1228/*
1229 * move to next volume
1230 */
1231static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1232{
1233 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1234
1235 return seq_list_next(v, &nn->nfs_volume_list, pos);
1236}
1237
1238/*
1239 * clean up after reading from the transports list
1240 */
1241static void nfs_volume_list_stop(struct seq_file *p, void *v)
1242 __releases(&nn->nfs_client_lock)
1243{
1244 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1245
1246 spin_unlock(&nn->nfs_client_lock);
1247}
1248
1249/*
1250 * display a header line followed by a load of call lines
1251 */
1252static int nfs_volume_list_show(struct seq_file *m, void *v)
1253{
1254 struct nfs_server *server;
1255 struct nfs_client *clp;
1256 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1257 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1258 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1259
1260 /* display header on line 1 */
1261 if (v == &nn->nfs_volume_list) {
1262 seq_puts(m, "NV SERVER PORT DEV FSID"
1263 " FSC\n");
1264 return 0;
1265 }
1266 /* display one transport per line on subsequent lines */
1267 server = list_entry(v, struct nfs_server, master_link);
1268 clp = server->nfs_client;
1269
1270 snprintf(dev, sizeof(dev), "%u:%u",
1271 MAJOR(server->s_dev), MINOR(server->s_dev));
1272
1273 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1274 (unsigned long long) server->fsid.major,
1275 (unsigned long long) server->fsid.minor);
1276
1277 rcu_read_lock();
1278 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1279 clp->rpc_ops->version,
1280 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1281 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1282 dev,
1283 fsid,
1284 nfs_server_fscache_state(server));
1285 rcu_read_unlock();
1286
1287 return 0;
1288}
1289
1290int nfs_fs_proc_net_init(struct net *net)
1291{
1292 struct nfs_net *nn = net_generic(net, nfs_net_id);
1293 struct proc_dir_entry *p;
1294
1295 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1296 if (!nn->proc_nfsfs)
1297 goto error_0;
1298
1299 /* a file of servers with which we're dealing */
1300 p = proc_create("servers", S_IFREG|S_IRUGO,
1301 nn->proc_nfsfs, &nfs_server_list_fops);
1302 if (!p)
1303 goto error_1;
1304
1305 /* a file of volumes that we have mounted */
1306 p = proc_create("volumes", S_IFREG|S_IRUGO,
1307 nn->proc_nfsfs, &nfs_volume_list_fops);
1308 if (!p)
1309 goto error_1;
1310 return 0;
1311
1312error_1:
1313 remove_proc_subtree("nfsfs", net->proc_net);
1314error_0:
1315 return -ENOMEM;
1316}
1317
1318void nfs_fs_proc_net_exit(struct net *net)
1319{
1320 remove_proc_subtree("nfsfs", net->proc_net);
1321}
1322
1323/*
1324 * initialise the /proc/fs/nfsfs/ directory
1325 */
1326int __init nfs_fs_proc_init(void)
1327{
1328 if (!proc_mkdir("fs/nfsfs", NULL))
1329 goto error_0;
1330
1331 /* a file of servers with which we're dealing */
1332 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1333 goto error_1;
1334
1335 /* a file of volumes that we have mounted */
1336 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1337 goto error_1;
1338
1339 return 0;
1340error_1:
1341 remove_proc_subtree("fs/nfsfs", NULL);
1342error_0:
1343 return -ENOMEM;
1344}
1345
1346/*
1347 * clean up the /proc/fs/nfsfs/ directory
1348 */
1349void nfs_fs_proc_exit(void)
1350{
1351 remove_proc_subtree("fs/nfsfs", NULL);
1352}
1353
1354#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_RWLOCK(nfs_version_lock);
59
60static struct nfs_subversion *nfs_version_mods[5] = {
61 [2] = NULL,
62 [3] = NULL,
63 [4] = NULL,
64};
65
66/*
67 * RPC cruft for NFS
68 */
69static const struct rpc_version *nfs_version[5] = {
70 [2] = NULL,
71 [3] = NULL,
72 [4] = NULL,
73};
74
75const struct rpc_program nfs_program = {
76 .name = "nfs",
77 .number = NFS_PROGRAM,
78 .nrvers = ARRAY_SIZE(nfs_version),
79 .version = nfs_version,
80 .pipe_dir_name = NFS_PIPE_DIRNAME,
81};
82
83static struct nfs_subversion *__find_nfs_version(unsigned int version)
84{
85 struct nfs_subversion *nfs;
86
87 read_lock(&nfs_version_lock);
88 nfs = nfs_version_mods[version];
89 read_unlock(&nfs_version_lock);
90 return nfs;
91}
92
93struct nfs_subversion *find_nfs_version(unsigned int version)
94{
95 struct nfs_subversion *nfs = __find_nfs_version(version);
96
97 if (!nfs && request_module("nfsv%d", version) == 0)
98 nfs = __find_nfs_version(version);
99
100 if (!nfs)
101 return ERR_PTR(-EPROTONOSUPPORT);
102
103 if (!get_nfs_version(nfs))
104 return ERR_PTR(-EAGAIN);
105
106 return nfs;
107}
108
109int get_nfs_version(struct nfs_subversion *nfs)
110{
111 return try_module_get(nfs->owner);
112}
113EXPORT_SYMBOL_GPL(get_nfs_version);
114
115void put_nfs_version(struct nfs_subversion *nfs)
116{
117 module_put(nfs->owner);
118}
119
120void register_nfs_version(struct nfs_subversion *nfs)
121{
122 write_lock(&nfs_version_lock);
123
124 nfs_version_mods[nfs->rpc_ops->version] = nfs;
125 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
126
127 write_unlock(&nfs_version_lock);
128}
129EXPORT_SYMBOL_GPL(register_nfs_version);
130
131void unregister_nfs_version(struct nfs_subversion *nfs)
132{
133 write_lock(&nfs_version_lock);
134
135 nfs_version[nfs->rpc_ops->version] = NULL;
136 nfs_version_mods[nfs->rpc_ops->version] = NULL;
137
138 write_unlock(&nfs_version_lock);
139}
140EXPORT_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 */
148struct 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_minorversion = cl_init->minorversion;
157 clp->cl_nfs_mod = cl_init->nfs_mod;
158 if (!get_nfs_version(clp->cl_nfs_mod))
159 goto error_dealloc;
160
161 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
162
163 refcount_set(&clp->cl_count, 1);
164 clp->cl_cons_state = NFS_CS_INITING;
165
166 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
167 clp->cl_addrlen = cl_init->addrlen;
168
169 if (cl_init->hostname) {
170 err = -ENOMEM;
171 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
172 if (!clp->cl_hostname)
173 goto error_cleanup;
174 }
175
176 INIT_LIST_HEAD(&clp->cl_superblocks);
177 clp->cl_rpcclient = ERR_PTR(-EINVAL);
178
179 clp->cl_flags = cl_init->init_flags;
180 clp->cl_proto = cl_init->proto;
181 clp->cl_nconnect = cl_init->nconnect;
182 clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1;
183 clp->cl_net = get_net(cl_init->net);
184
185#if IS_ENABLED(CONFIG_NFS_LOCALIO)
186 seqlock_init(&clp->cl_boot_lock);
187 ktime_get_real_ts64(&clp->cl_nfssvc_boot);
188 nfs_uuid_init(&clp->cl_uuid);
189 spin_lock_init(&clp->cl_localio_lock);
190#endif /* CONFIG_NFS_LOCALIO */
191
192 clp->cl_principal = "*";
193 clp->cl_xprtsec = cl_init->xprtsec;
194 return clp;
195
196error_cleanup:
197 put_nfs_version(clp->cl_nfs_mod);
198error_dealloc:
199 kfree(clp);
200error_0:
201 return ERR_PTR(err);
202}
203EXPORT_SYMBOL_GPL(nfs_alloc_client);
204
205#if IS_ENABLED(CONFIG_NFS_V4)
206static void nfs_cleanup_cb_ident_idr(struct net *net)
207{
208 struct nfs_net *nn = net_generic(net, nfs_net_id);
209
210 idr_destroy(&nn->cb_ident_idr);
211}
212
213/* nfs_client_lock held */
214static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
215{
216 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
217
218 if (clp->cl_cb_ident)
219 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
220}
221
222static void pnfs_init_server(struct nfs_server *server)
223{
224 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
225}
226
227#else
228static void nfs_cleanup_cb_ident_idr(struct net *net)
229{
230}
231
232static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
233{
234}
235
236static void pnfs_init_server(struct nfs_server *server)
237{
238}
239
240#endif /* CONFIG_NFS_V4 */
241
242/*
243 * Destroy a shared client record
244 */
245void nfs_free_client(struct nfs_client *clp)
246{
247 nfs_local_disable(clp);
248
249 /* -EIO all pending I/O */
250 if (!IS_ERR(clp->cl_rpcclient))
251 rpc_shutdown_client(clp->cl_rpcclient);
252
253 put_net(clp->cl_net);
254 put_nfs_version(clp->cl_nfs_mod);
255 kfree(clp->cl_hostname);
256 kfree(clp->cl_acceptor);
257 kfree_rcu(clp, rcu);
258}
259EXPORT_SYMBOL_GPL(nfs_free_client);
260
261/*
262 * Release a reference to a shared client record
263 */
264void nfs_put_client(struct nfs_client *clp)
265{
266 struct nfs_net *nn;
267
268 if (!clp)
269 return;
270
271 nn = net_generic(clp->cl_net, nfs_net_id);
272
273 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
274 list_del(&clp->cl_share_link);
275 nfs_cb_idr_remove_locked(clp);
276 spin_unlock(&nn->nfs_client_lock);
277
278 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
279
280 clp->rpc_ops->free_client(clp);
281 }
282}
283EXPORT_SYMBOL_GPL(nfs_put_client);
284
285/*
286 * Find an nfs_client on the list that matches the initialisation data
287 * that is supplied.
288 */
289static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
290{
291 struct nfs_client *clp;
292 const struct sockaddr *sap = (struct sockaddr *)data->addr;
293 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
294 int error;
295
296again:
297 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
298 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
299 /* Don't match clients that failed to initialise properly */
300 if (clp->cl_cons_state < 0)
301 continue;
302
303 /* If a client is still initializing then we need to wait */
304 if (clp->cl_cons_state > NFS_CS_READY) {
305 refcount_inc(&clp->cl_count);
306 spin_unlock(&nn->nfs_client_lock);
307 error = nfs_wait_client_init_complete(clp);
308 nfs_put_client(clp);
309 spin_lock(&nn->nfs_client_lock);
310 if (error < 0)
311 return ERR_PTR(error);
312 goto again;
313 }
314
315 /* Different NFS versions cannot share the same nfs_client */
316 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
317 continue;
318
319 if (clp->cl_proto != data->proto)
320 continue;
321 /* Match nfsv4 minorversion */
322 if (clp->cl_minorversion != data->minorversion)
323 continue;
324
325 /* Match request for a dedicated DS */
326 if (test_bit(NFS_CS_DS, &data->init_flags) !=
327 test_bit(NFS_CS_DS, &clp->cl_flags))
328 continue;
329
330 /* Match the full socket address */
331 if (!rpc_cmp_addr_port(sap, clap))
332 /* Match all xprt_switch full socket addresses */
333 if (IS_ERR(clp->cl_rpcclient) ||
334 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
335 sap))
336 continue;
337
338 /* Match the xprt security policy */
339 if (clp->cl_xprtsec.policy != data->xprtsec.policy)
340 continue;
341
342 refcount_inc(&clp->cl_count);
343 return clp;
344 }
345 return NULL;
346}
347
348/*
349 * Return true if @clp is done initializing, false if still working on it.
350 *
351 * Use nfs_client_init_status to check if it was successful.
352 */
353bool nfs_client_init_is_complete(const struct nfs_client *clp)
354{
355 return clp->cl_cons_state <= NFS_CS_READY;
356}
357EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
358
359/*
360 * Return 0 if @clp was successfully initialized, -errno otherwise.
361 *
362 * This must be called *after* nfs_client_init_is_complete() returns true,
363 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
364 */
365int nfs_client_init_status(const struct nfs_client *clp)
366{
367 /* called without checking nfs_client_init_is_complete */
368 if (clp->cl_cons_state > NFS_CS_READY) {
369 WARN_ON_ONCE(1);
370 return -EINVAL;
371 }
372 return clp->cl_cons_state;
373}
374EXPORT_SYMBOL_GPL(nfs_client_init_status);
375
376int nfs_wait_client_init_complete(const struct nfs_client *clp)
377{
378 return wait_event_killable(nfs_client_active_wq,
379 nfs_client_init_is_complete(clp));
380}
381EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
382
383/*
384 * Found an existing client. Make sure it's ready before returning.
385 */
386static struct nfs_client *
387nfs_found_client(const struct nfs_client_initdata *cl_init,
388 struct nfs_client *clp)
389{
390 int error;
391
392 error = nfs_wait_client_init_complete(clp);
393 if (error < 0) {
394 nfs_put_client(clp);
395 return ERR_PTR(-ERESTARTSYS);
396 }
397
398 if (clp->cl_cons_state < NFS_CS_READY) {
399 error = clp->cl_cons_state;
400 nfs_put_client(clp);
401 return ERR_PTR(error);
402 }
403
404 smp_rmb();
405 return clp;
406}
407
408/*
409 * Look up a client by IP address and protocol version
410 * - creates a new record if one doesn't yet exist
411 */
412struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
413{
414 struct nfs_client *clp, *new = NULL;
415 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
416 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
417
418 if (cl_init->hostname == NULL) {
419 WARN_ON(1);
420 return ERR_PTR(-EINVAL);
421 }
422
423 /* see if the client already exists */
424 do {
425 spin_lock(&nn->nfs_client_lock);
426
427 clp = nfs_match_client(cl_init);
428 if (clp) {
429 spin_unlock(&nn->nfs_client_lock);
430 if (new)
431 new->rpc_ops->free_client(new);
432 if (IS_ERR(clp))
433 return clp;
434 return nfs_found_client(cl_init, clp);
435 }
436 if (new) {
437 list_add_tail(&new->cl_share_link,
438 &nn->nfs_client_list);
439 spin_unlock(&nn->nfs_client_lock);
440 new = rpc_ops->init_client(new, cl_init);
441 if (!IS_ERR(new))
442 nfs_local_probe(new);
443 return new;
444 }
445
446 spin_unlock(&nn->nfs_client_lock);
447
448 new = rpc_ops->alloc_client(cl_init);
449 } while (!IS_ERR(new));
450
451 return new;
452}
453EXPORT_SYMBOL_GPL(nfs_get_client);
454
455/*
456 * Mark a server as ready or failed
457 */
458void nfs_mark_client_ready(struct nfs_client *clp, int state)
459{
460 smp_wmb();
461 clp->cl_cons_state = state;
462 wake_up_all(&nfs_client_active_wq);
463}
464EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
465
466/*
467 * Initialise the timeout values for a connection
468 */
469void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
470 int timeo, int retrans)
471{
472 to->to_initval = timeo * HZ / 10;
473 to->to_retries = retrans;
474
475 switch (proto) {
476 case XPRT_TRANSPORT_TCP:
477 case XPRT_TRANSPORT_TCP_TLS:
478 case XPRT_TRANSPORT_RDMA:
479 if (retrans == NFS_UNSPEC_RETRANS)
480 to->to_retries = NFS_DEF_TCP_RETRANS;
481 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
482 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
483 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
484 to->to_initval = NFS_MAX_TCP_TIMEOUT;
485 to->to_increment = to->to_initval;
486 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
487 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
488 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
489 if (to->to_maxval < to->to_initval)
490 to->to_maxval = to->to_initval;
491 to->to_exponential = 0;
492 break;
493 case XPRT_TRANSPORT_UDP:
494 if (retrans == NFS_UNSPEC_RETRANS)
495 to->to_retries = NFS_DEF_UDP_RETRANS;
496 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
497 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
498 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
499 to->to_initval = NFS_MAX_UDP_TIMEOUT;
500 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
501 to->to_exponential = 1;
502 break;
503 default:
504 BUG();
505 }
506}
507EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
508
509/*
510 * Create an RPC client handle
511 */
512int nfs_create_rpc_client(struct nfs_client *clp,
513 const struct nfs_client_initdata *cl_init,
514 rpc_authflavor_t flavor)
515{
516 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
517 struct rpc_clnt *clnt = NULL;
518 struct rpc_create_args args = {
519 .net = clp->cl_net,
520 .protocol = clp->cl_proto,
521 .nconnect = clp->cl_nconnect,
522 .address = (struct sockaddr *)&clp->cl_addr,
523 .addrsize = clp->cl_addrlen,
524 .timeout = cl_init->timeparms,
525 .servername = clp->cl_hostname,
526 .nodename = cl_init->nodename,
527 .program = &nfs_program,
528 .stats = &nn->rpcstats,
529 .version = clp->rpc_ops->version,
530 .authflavor = flavor,
531 .cred = cl_init->cred,
532 .xprtsec = cl_init->xprtsec,
533 .connect_timeout = cl_init->connect_timeout,
534 .reconnect_timeout = cl_init->reconnect_timeout,
535 };
536
537 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
538 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
539 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
540 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
541 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
542 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
543 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
544 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
545 if (test_bit(NFS_CS_NOPING, &clp->cl_flags))
546 args.flags |= RPC_CLNT_CREATE_NOPING;
547 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags))
548 args.flags |= RPC_CLNT_CREATE_REUSEPORT;
549
550 if (!IS_ERR(clp->cl_rpcclient))
551 return 0;
552
553 clnt = rpc_create(&args);
554 if (IS_ERR(clnt)) {
555 dprintk("%s: cannot create RPC client. Error = %ld\n",
556 __func__, PTR_ERR(clnt));
557 return PTR_ERR(clnt);
558 }
559
560 clnt->cl_principal = clp->cl_principal;
561 clp->cl_rpcclient = clnt;
562 clnt->cl_max_connect = clp->cl_max_connect;
563 return 0;
564}
565EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
566
567/*
568 * Version 2 or 3 client destruction
569 */
570static void nfs_destroy_server(struct nfs_server *server)
571{
572 if (server->nlm_host)
573 nlmclnt_done(server->nlm_host);
574}
575
576/*
577 * Version 2 or 3 lockd setup
578 */
579static int nfs_start_lockd(struct nfs_server *server)
580{
581 struct nlm_host *host;
582 struct nfs_client *clp = server->nfs_client;
583 struct nlmclnt_initdata nlm_init = {
584 .hostname = clp->cl_hostname,
585 .address = (struct sockaddr *)&clp->cl_addr,
586 .addrlen = clp->cl_addrlen,
587 .nfs_version = clp->rpc_ops->version,
588 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
589 1 : 0,
590 .net = clp->cl_net,
591 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
592 .cred = server->cred,
593 };
594
595 if (nlm_init.nfs_version > 3)
596 return 0;
597 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
598 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
599 return 0;
600
601 switch (clp->cl_proto) {
602 default:
603 nlm_init.protocol = IPPROTO_TCP;
604 break;
605#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
606 case XPRT_TRANSPORT_UDP:
607 nlm_init.protocol = IPPROTO_UDP;
608#endif
609 }
610
611 host = nlmclnt_init(&nlm_init);
612 if (IS_ERR(host))
613 return PTR_ERR(host);
614
615 server->nlm_host = host;
616 server->destroy = nfs_destroy_server;
617 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL);
618 return 0;
619}
620
621/*
622 * Create a general RPC client
623 */
624int nfs_init_server_rpcclient(struct nfs_server *server,
625 const struct rpc_timeout *timeo,
626 rpc_authflavor_t pseudoflavour)
627{
628 struct nfs_client *clp = server->nfs_client;
629
630 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
631 pseudoflavour);
632 if (IS_ERR(server->client)) {
633 dprintk("%s: couldn't create rpc_client!\n", __func__);
634 return PTR_ERR(server->client);
635 }
636
637 memcpy(&server->client->cl_timeout_default,
638 timeo,
639 sizeof(server->client->cl_timeout_default));
640 server->client->cl_timeout = &server->client->cl_timeout_default;
641 server->client->cl_softrtry = 0;
642 if (server->flags & NFS_MOUNT_SOFTERR)
643 server->client->cl_softerr = 1;
644 if (server->flags & NFS_MOUNT_SOFT)
645 server->client->cl_softrtry = 1;
646
647 nfs_sysfs_link_rpc_client(server, server->client, NULL);
648 return 0;
649}
650EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
651
652/**
653 * nfs_init_client - Initialise an NFS2 or NFS3 client
654 *
655 * @clp: nfs_client to initialise
656 * @cl_init: Initialisation parameters
657 *
658 * Returns pointer to an NFS client, or an ERR_PTR value.
659 */
660struct nfs_client *nfs_init_client(struct nfs_client *clp,
661 const struct nfs_client_initdata *cl_init)
662{
663 int error;
664
665 /* the client is already initialised */
666 if (clp->cl_cons_state == NFS_CS_READY)
667 return clp;
668
669 /*
670 * Create a client RPC handle for doing FSSTAT with UNIX auth only
671 * - RFC 2623, sec 2.3.2
672 */
673 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
674 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
675 if (error < 0) {
676 nfs_put_client(clp);
677 clp = ERR_PTR(error);
678 }
679 return clp;
680}
681EXPORT_SYMBOL_GPL(nfs_init_client);
682
683/*
684 * Create a version 2 or 3 client
685 */
686static int nfs_init_server(struct nfs_server *server,
687 const struct fs_context *fc)
688{
689 const struct nfs_fs_context *ctx = nfs_fc2context(fc);
690 struct rpc_timeout timeparms;
691 struct nfs_client_initdata cl_init = {
692 .hostname = ctx->nfs_server.hostname,
693 .addr = &ctx->nfs_server._address,
694 .addrlen = ctx->nfs_server.addrlen,
695 .nfs_mod = ctx->nfs_mod,
696 .proto = ctx->nfs_server.protocol,
697 .net = fc->net_ns,
698 .timeparms = &timeparms,
699 .cred = server->cred,
700 .nconnect = ctx->nfs_server.nconnect,
701 .init_flags = (1UL << NFS_CS_REUSEPORT),
702 .xprtsec = ctx->xprtsec,
703 };
704 struct nfs_client *clp;
705 int error;
706
707 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
708 ctx->timeo, ctx->retrans);
709 if (ctx->flags & NFS_MOUNT_NORESVPORT)
710 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
711
712 /* Allocate or find a client reference we can use */
713 clp = nfs_get_client(&cl_init);
714 if (IS_ERR(clp))
715 return PTR_ERR(clp);
716
717 server->nfs_client = clp;
718 nfs_sysfs_add_server(server);
719 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state");
720
721 /* Initialise the client representation from the mount data */
722 server->flags = ctx->flags;
723 server->options = ctx->options;
724 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS;
725
726 switch (clp->rpc_ops->version) {
727 case 2:
728 server->fattr_valid = NFS_ATTR_FATTR_V2;
729 break;
730 case 3:
731 server->fattr_valid = NFS_ATTR_FATTR_V3;
732 break;
733 default:
734 server->fattr_valid = NFS_ATTR_FATTR_V4;
735 }
736
737 if (ctx->rsize)
738 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto);
739 if (ctx->wsize)
740 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto);
741
742 server->acregmin = ctx->acregmin * HZ;
743 server->acregmax = ctx->acregmax * HZ;
744 server->acdirmin = ctx->acdirmin * HZ;
745 server->acdirmax = ctx->acdirmax * HZ;
746
747 /* Start lockd here, before we might error out */
748 error = nfs_start_lockd(server);
749 if (error < 0)
750 goto error;
751
752 server->port = ctx->nfs_server.port;
753 server->auth_info = ctx->auth_info;
754
755 error = nfs_init_server_rpcclient(server, &timeparms,
756 ctx->selected_flavor);
757 if (error < 0)
758 goto error;
759
760 /* Preserve the values of mount_server-related mount options */
761 if (ctx->mount_server.addrlen) {
762 memcpy(&server->mountd_address, &ctx->mount_server.address,
763 ctx->mount_server.addrlen);
764 server->mountd_addrlen = ctx->mount_server.addrlen;
765 }
766 server->mountd_version = ctx->mount_server.version;
767 server->mountd_port = ctx->mount_server.port;
768 server->mountd_protocol = ctx->mount_server.protocol;
769
770 server->namelen = ctx->namlen;
771 return 0;
772
773error:
774 server->nfs_client = NULL;
775 nfs_put_client(clp);
776 return error;
777}
778
779/*
780 * Load up the server record from information gained in an fsinfo record
781 */
782static void nfs_server_set_fsinfo(struct nfs_server *server,
783 struct nfs_fsinfo *fsinfo)
784{
785 struct nfs_client *clp = server->nfs_client;
786 unsigned long max_rpc_payload, raw_max_rpc_payload;
787
788 /* Work out a lot of parameters */
789 if (server->rsize == 0)
790 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto);
791 if (server->wsize == 0)
792 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto);
793
794 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
795 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto);
796 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
797 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto);
798
799 raw_max_rpc_payload = rpc_max_payload(server->client);
800 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL);
801
802 if (server->rsize > max_rpc_payload)
803 server->rsize = max_rpc_payload;
804 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
805 server->rsize = NFS_MAX_FILE_IO_SIZE;
806 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
807
808 if (server->wsize > max_rpc_payload)
809 server->wsize = max_rpc_payload;
810 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
811 server->wsize = NFS_MAX_FILE_IO_SIZE;
812 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
813
814 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
815
816 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
817 if (server->dtsize > NFS_MAX_FILE_IO_SIZE)
818 server->dtsize = NFS_MAX_FILE_IO_SIZE;
819 if (server->dtsize > server->rsize)
820 server->dtsize = server->rsize;
821
822 if (server->flags & NFS_MOUNT_NOAC) {
823 server->acregmin = server->acregmax = 0;
824 server->acdirmin = server->acdirmax = 0;
825 }
826
827 server->maxfilesize = fsinfo->maxfilesize;
828
829 server->time_delta = fsinfo->time_delta;
830 server->change_attr_type = fsinfo->change_attr_type;
831
832 server->clone_blksize = fsinfo->clone_blksize;
833 /* We're airborne Set socket buffersize */
834 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
835
836#ifdef CONFIG_NFS_V4_2
837 /*
838 * Defaults until limited by the session parameters.
839 */
840 server->gxasize = min_t(unsigned int, raw_max_rpc_payload,
841 XATTR_SIZE_MAX);
842 server->sxasize = min_t(unsigned int, raw_max_rpc_payload,
843 XATTR_SIZE_MAX);
844 server->lxasize = min_t(unsigned int, raw_max_rpc_payload,
845 nfs42_listxattr_xdrsize(XATTR_LIST_MAX));
846
847 if (fsinfo->xattr_support)
848 server->caps |= NFS_CAP_XATTR;
849#endif
850}
851
852/*
853 * Probe filesystem information, including the FSID on v2/v3
854 */
855static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
856{
857 struct nfs_fsinfo fsinfo;
858 struct nfs_client *clp = server->nfs_client;
859 int error;
860
861 if (clp->rpc_ops->set_capabilities != NULL) {
862 error = clp->rpc_ops->set_capabilities(server, mntfh);
863 if (error < 0)
864 return error;
865 }
866
867 fsinfo.fattr = fattr;
868 fsinfo.nlayouttypes = 0;
869 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
870 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
871 if (error < 0)
872 return error;
873
874 nfs_server_set_fsinfo(server, &fsinfo);
875
876 /* Get some general file system info */
877 if (server->namelen == 0) {
878 struct nfs_pathconf pathinfo;
879
880 pathinfo.fattr = fattr;
881 nfs_fattr_init(fattr);
882
883 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
884 server->namelen = pathinfo.max_namelen;
885 }
886
887 if (clp->rpc_ops->discover_trunking != NULL &&
888 (server->caps & NFS_CAP_FS_LOCATIONS &&
889 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) {
890 error = clp->rpc_ops->discover_trunking(server, mntfh);
891 if (error < 0)
892 return error;
893 }
894
895 return 0;
896}
897
898/*
899 * Grab the destination's particulars, including lease expiry time.
900 *
901 * Returns zero if probe succeeded and retrieved FSID matches the FSID
902 * we have cached.
903 */
904int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh)
905{
906 struct nfs_fattr *fattr;
907 int error;
908
909 fattr = nfs_alloc_fattr();
910 if (fattr == NULL)
911 return -ENOMEM;
912
913 /* Sanity: the probe won't work if the destination server
914 * does not recognize the migrated FH. */
915 error = nfs_probe_fsinfo(server, mntfh, fattr);
916
917 nfs_free_fattr(fattr);
918 return error;
919}
920EXPORT_SYMBOL_GPL(nfs_probe_server);
921
922/*
923 * Copy useful information when duplicating a server record
924 */
925void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
926{
927 target->flags = source->flags;
928 target->rsize = source->rsize;
929 target->wsize = source->wsize;
930 target->acregmin = source->acregmin;
931 target->acregmax = source->acregmax;
932 target->acdirmin = source->acdirmin;
933 target->acdirmax = source->acdirmax;
934 target->caps = source->caps;
935 target->options = source->options;
936 target->auth_info = source->auth_info;
937 target->port = source->port;
938}
939EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
940
941void nfs_server_insert_lists(struct nfs_server *server)
942{
943 struct nfs_client *clp = server->nfs_client;
944 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
945
946 spin_lock(&nn->nfs_client_lock);
947 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
948 list_add_tail(&server->master_link, &nn->nfs_volume_list);
949 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
950 spin_unlock(&nn->nfs_client_lock);
951
952}
953EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
954
955void nfs_server_remove_lists(struct nfs_server *server)
956{
957 struct nfs_client *clp = server->nfs_client;
958 struct nfs_net *nn;
959
960 if (clp == NULL)
961 return;
962 nn = net_generic(clp->cl_net, nfs_net_id);
963 spin_lock(&nn->nfs_client_lock);
964 list_del_rcu(&server->client_link);
965 if (list_empty(&clp->cl_superblocks))
966 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
967 list_del(&server->master_link);
968 spin_unlock(&nn->nfs_client_lock);
969
970 synchronize_rcu();
971}
972EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
973
974static DEFINE_IDA(s_sysfs_ids);
975
976/*
977 * Allocate and initialise a server record
978 */
979struct nfs_server *nfs_alloc_server(void)
980{
981 struct nfs_server *server;
982
983 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
984 if (!server)
985 return NULL;
986
987 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL);
988 if (server->s_sysfs_id < 0) {
989 kfree(server);
990 return NULL;
991 }
992
993 server->client = server->client_acl = ERR_PTR(-EINVAL);
994
995 /* Zero out the NFS state stuff */
996 INIT_LIST_HEAD(&server->client_link);
997 INIT_LIST_HEAD(&server->master_link);
998 INIT_LIST_HEAD(&server->delegations);
999 INIT_LIST_HEAD(&server->layouts);
1000 INIT_LIST_HEAD(&server->state_owners_lru);
1001 INIT_LIST_HEAD(&server->ss_copies);
1002 INIT_LIST_HEAD(&server->ss_src_copies);
1003
1004 atomic_set(&server->active, 0);
1005
1006 server->io_stats = nfs_alloc_iostats();
1007 if (!server->io_stats) {
1008 kfree(server);
1009 return NULL;
1010 }
1011
1012 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
1013
1014 init_waitqueue_head(&server->write_congestion_wait);
1015 atomic_long_set(&server->writeback, 0);
1016
1017 atomic64_set(&server->owner_ctr, 0);
1018
1019 pnfs_init_server(server);
1020 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
1021
1022 return server;
1023}
1024EXPORT_SYMBOL_GPL(nfs_alloc_server);
1025
1026static void delayed_free(struct rcu_head *p)
1027{
1028 struct nfs_server *server = container_of(p, struct nfs_server, rcu);
1029
1030 nfs_free_iostats(server->io_stats);
1031 kfree(server);
1032}
1033
1034/*
1035 * Free up a server record
1036 */
1037void nfs_free_server(struct nfs_server *server)
1038{
1039 nfs_server_remove_lists(server);
1040
1041 if (server->destroy != NULL)
1042 server->destroy(server);
1043
1044 if (!IS_ERR(server->client_acl))
1045 rpc_shutdown_client(server->client_acl);
1046 if (!IS_ERR(server->client))
1047 rpc_shutdown_client(server->client);
1048
1049 nfs_put_client(server->nfs_client);
1050
1051 if (server->kobj.state_initialized) {
1052 nfs_sysfs_remove_server(server);
1053 kobject_put(&server->kobj);
1054 }
1055 ida_free(&s_sysfs_ids, server->s_sysfs_id);
1056
1057 put_cred(server->cred);
1058 nfs_release_automount_timer();
1059 call_rcu(&server->rcu, delayed_free);
1060}
1061EXPORT_SYMBOL_GPL(nfs_free_server);
1062
1063/*
1064 * Create a version 2 or 3 volume record
1065 * - keyed on server and FSID
1066 */
1067struct nfs_server *nfs_create_server(struct fs_context *fc)
1068{
1069 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1070 struct nfs_server *server;
1071 struct nfs_fattr *fattr;
1072 int error;
1073
1074 server = nfs_alloc_server();
1075 if (!server)
1076 return ERR_PTR(-ENOMEM);
1077
1078 server->cred = get_cred(fc->cred);
1079
1080 error = -ENOMEM;
1081 fattr = nfs_alloc_fattr();
1082 if (fattr == NULL)
1083 goto error;
1084
1085 /* Get a client representation */
1086 error = nfs_init_server(server, fc);
1087 if (error < 0)
1088 goto error;
1089
1090 /* Probe the root fh to retrieve its FSID */
1091 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
1092 if (error < 0)
1093 goto error;
1094 if (server->nfs_client->rpc_ops->version == 3) {
1095 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1096 server->namelen = NFS3_MAXNAMLEN;
1097 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
1098 server->caps |= NFS_CAP_READDIRPLUS;
1099 } else {
1100 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1101 server->namelen = NFS2_MAXNAMLEN;
1102 }
1103
1104 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1105 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh,
1106 fattr, NULL);
1107 if (error < 0) {
1108 dprintk("nfs_create_server: getattr error = %d\n", -error);
1109 goto error;
1110 }
1111 }
1112 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1113
1114 dprintk("Server FSID: %llx:%llx\n",
1115 (unsigned long long) server->fsid.major,
1116 (unsigned long long) server->fsid.minor);
1117
1118 nfs_server_insert_lists(server);
1119 server->mount_time = jiffies;
1120 nfs_free_fattr(fattr);
1121 return server;
1122
1123error:
1124 nfs_free_fattr(fattr);
1125 nfs_free_server(server);
1126 return ERR_PTR(error);
1127}
1128EXPORT_SYMBOL_GPL(nfs_create_server);
1129
1130/*
1131 * Clone an NFS2, NFS3 or NFS4 server record
1132 */
1133struct nfs_server *nfs_clone_server(struct nfs_server *source,
1134 struct nfs_fh *fh,
1135 struct nfs_fattr *fattr,
1136 rpc_authflavor_t flavor)
1137{
1138 struct nfs_server *server;
1139 int error;
1140
1141 server = nfs_alloc_server();
1142 if (!server)
1143 return ERR_PTR(-ENOMEM);
1144
1145 server->cred = get_cred(source->cred);
1146
1147 /* Copy data from the source */
1148 server->nfs_client = source->nfs_client;
1149 server->destroy = source->destroy;
1150 refcount_inc(&server->nfs_client->cl_count);
1151 nfs_server_copy_userdata(server, source);
1152
1153 server->fsid = fattr->fsid;
1154
1155 nfs_sysfs_add_server(server);
1156
1157 nfs_sysfs_link_rpc_client(server,
1158 server->nfs_client->cl_rpcclient, "_state");
1159
1160 error = nfs_init_server_rpcclient(server,
1161 source->client->cl_timeout,
1162 flavor);
1163 if (error < 0)
1164 goto out_free_server;
1165
1166 /* probe the filesystem info for this server filesystem */
1167 error = nfs_probe_server(server, fh);
1168 if (error < 0)
1169 goto out_free_server;
1170
1171 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1172 server->namelen = NFS4_MAXNAMLEN;
1173
1174 error = nfs_start_lockd(server);
1175 if (error < 0)
1176 goto out_free_server;
1177
1178 nfs_server_insert_lists(server);
1179 server->mount_time = jiffies;
1180
1181 return server;
1182
1183out_free_server:
1184 nfs_free_server(server);
1185 return ERR_PTR(error);
1186}
1187EXPORT_SYMBOL_GPL(nfs_clone_server);
1188
1189void nfs_clients_init(struct net *net)
1190{
1191 struct nfs_net *nn = net_generic(net, nfs_net_id);
1192
1193 INIT_LIST_HEAD(&nn->nfs_client_list);
1194 INIT_LIST_HEAD(&nn->nfs_volume_list);
1195#if IS_ENABLED(CONFIG_NFS_V4)
1196 idr_init(&nn->cb_ident_idr);
1197#endif
1198 spin_lock_init(&nn->nfs_client_lock);
1199 nn->boot_time = ktime_get_real();
1200 memset(&nn->rpcstats, 0, sizeof(nn->rpcstats));
1201 nn->rpcstats.program = &nfs_program;
1202
1203 nfs_netns_sysfs_setup(nn, net);
1204}
1205
1206void nfs_clients_exit(struct net *net)
1207{
1208 struct nfs_net *nn = net_generic(net, nfs_net_id);
1209
1210 nfs_netns_sysfs_destroy(nn);
1211 nfs_cleanup_cb_ident_idr(net);
1212 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
1213 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1214}
1215
1216#ifdef CONFIG_PROC_FS
1217static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1218static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1219static void nfs_server_list_stop(struct seq_file *p, void *v);
1220static int nfs_server_list_show(struct seq_file *m, void *v);
1221
1222static const struct seq_operations nfs_server_list_ops = {
1223 .start = nfs_server_list_start,
1224 .next = nfs_server_list_next,
1225 .stop = nfs_server_list_stop,
1226 .show = nfs_server_list_show,
1227};
1228
1229static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1230static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1231static void nfs_volume_list_stop(struct seq_file *p, void *v);
1232static int nfs_volume_list_show(struct seq_file *m, void *v);
1233
1234static const struct seq_operations nfs_volume_list_ops = {
1235 .start = nfs_volume_list_start,
1236 .next = nfs_volume_list_next,
1237 .stop = nfs_volume_list_stop,
1238 .show = nfs_volume_list_show,
1239};
1240
1241/*
1242 * set up the iterator to start reading from the server list and return the first item
1243 */
1244static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1245 __acquires(&nn->nfs_client_lock)
1246{
1247 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1248
1249 /* lock the list against modification */
1250 spin_lock(&nn->nfs_client_lock);
1251 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1252}
1253
1254/*
1255 * move to next server
1256 */
1257static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1258{
1259 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1260
1261 return seq_list_next(v, &nn->nfs_client_list, pos);
1262}
1263
1264/*
1265 * clean up after reading from the transports list
1266 */
1267static void nfs_server_list_stop(struct seq_file *p, void *v)
1268 __releases(&nn->nfs_client_lock)
1269{
1270 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1271
1272 spin_unlock(&nn->nfs_client_lock);
1273}
1274
1275/*
1276 * display a header line followed by a load of call lines
1277 */
1278static int nfs_server_list_show(struct seq_file *m, void *v)
1279{
1280 struct nfs_client *clp;
1281 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1282
1283 /* display header on line 1 */
1284 if (v == &nn->nfs_client_list) {
1285 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1286 return 0;
1287 }
1288
1289 /* display one transport per line on subsequent lines */
1290 clp = list_entry(v, struct nfs_client, cl_share_link);
1291
1292 /* Check if the client is initialized */
1293 if (clp->cl_cons_state != NFS_CS_READY)
1294 return 0;
1295
1296 rcu_read_lock();
1297 seq_printf(m, "v%u %s %s %3d %s\n",
1298 clp->rpc_ops->version,
1299 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1300 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1301 refcount_read(&clp->cl_count),
1302 clp->cl_hostname);
1303 rcu_read_unlock();
1304
1305 return 0;
1306}
1307
1308/*
1309 * set up the iterator to start reading from the volume list and return the first item
1310 */
1311static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1312 __acquires(&nn->nfs_client_lock)
1313{
1314 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1315
1316 /* lock the list against modification */
1317 spin_lock(&nn->nfs_client_lock);
1318 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1319}
1320
1321/*
1322 * move to next volume
1323 */
1324static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1325{
1326 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1327
1328 return seq_list_next(v, &nn->nfs_volume_list, pos);
1329}
1330
1331/*
1332 * clean up after reading from the transports list
1333 */
1334static void nfs_volume_list_stop(struct seq_file *p, void *v)
1335 __releases(&nn->nfs_client_lock)
1336{
1337 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1338
1339 spin_unlock(&nn->nfs_client_lock);
1340}
1341
1342/*
1343 * display a header line followed by a load of call lines
1344 */
1345static int nfs_volume_list_show(struct seq_file *m, void *v)
1346{
1347 struct nfs_server *server;
1348 struct nfs_client *clp;
1349 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1350 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1351 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1352
1353 /* display header on line 1 */
1354 if (v == &nn->nfs_volume_list) {
1355 seq_puts(m, "NV SERVER PORT DEV FSID"
1356 " FSC\n");
1357 return 0;
1358 }
1359 /* display one transport per line on subsequent lines */
1360 server = list_entry(v, struct nfs_server, master_link);
1361 clp = server->nfs_client;
1362
1363 snprintf(dev, sizeof(dev), "%u:%u",
1364 MAJOR(server->s_dev), MINOR(server->s_dev));
1365
1366 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1367 (unsigned long long) server->fsid.major,
1368 (unsigned long long) server->fsid.minor);
1369
1370 rcu_read_lock();
1371 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1372 clp->rpc_ops->version,
1373 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1374 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1375 dev,
1376 fsid,
1377 nfs_server_fscache_state(server));
1378 rcu_read_unlock();
1379
1380 return 0;
1381}
1382
1383int nfs_fs_proc_net_init(struct net *net)
1384{
1385 struct nfs_net *nn = net_generic(net, nfs_net_id);
1386 struct proc_dir_entry *p;
1387
1388 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1389 if (!nn->proc_nfsfs)
1390 goto error_0;
1391
1392 /* a file of servers with which we're dealing */
1393 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1394 &nfs_server_list_ops, sizeof(struct seq_net_private));
1395 if (!p)
1396 goto error_1;
1397
1398 /* a file of volumes that we have mounted */
1399 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1400 &nfs_volume_list_ops, sizeof(struct seq_net_private));
1401 if (!p)
1402 goto error_1;
1403 return 0;
1404
1405error_1:
1406 remove_proc_subtree("nfsfs", net->proc_net);
1407error_0:
1408 return -ENOMEM;
1409}
1410
1411void nfs_fs_proc_net_exit(struct net *net)
1412{
1413 remove_proc_subtree("nfsfs", net->proc_net);
1414}
1415
1416/*
1417 * initialise the /proc/fs/nfsfs/ directory
1418 */
1419int __init nfs_fs_proc_init(void)
1420{
1421 if (!proc_mkdir("fs/nfsfs", NULL))
1422 goto error_0;
1423
1424 /* a file of servers with which we're dealing */
1425 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1426 goto error_1;
1427
1428 /* a file of volumes that we have mounted */
1429 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1430 goto error_1;
1431
1432 return 0;
1433error_1:
1434 remove_proc_subtree("fs/nfsfs", NULL);
1435error_0:
1436 return -ENOMEM;
1437}
1438
1439/*
1440 * clean up the /proc/fs/nfsfs/ directory
1441 */
1442void nfs_fs_proc_exit(void)
1443{
1444 remove_proc_subtree("fs/nfsfs", NULL);
1445 ida_destroy(&s_sysfs_ids);
1446}
1447
1448#endif /* CONFIG_PROC_FS */