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1/* client.c: NFS client sharing and management code
2 *
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/sched.h>
16#include <linux/time.h>
17#include <linux/kernel.h>
18#include <linux/mm.h>
19#include <linux/string.h>
20#include <linux/stat.h>
21#include <linux/errno.h>
22#include <linux/unistd.h>
23#include <linux/sunrpc/addr.h>
24#include <linux/sunrpc/clnt.h>
25#include <linux/sunrpc/stats.h>
26#include <linux/sunrpc/metrics.h>
27#include <linux/sunrpc/xprtsock.h>
28#include <linux/sunrpc/xprtrdma.h>
29#include <linux/nfs_fs.h>
30#include <linux/nfs_mount.h>
31#include <linux/nfs4_mount.h>
32#include <linux/lockd/bind.h>
33#include <linux/seq_file.h>
34#include <linux/mount.h>
35#include <linux/vfs.h>
36#include <linux/inet.h>
37#include <linux/in6.h>
38#include <linux/slab.h>
39#include <linux/idr.h>
40#include <net/ipv6.h>
41#include <linux/nfs_xdr.h>
42#include <linux/sunrpc/bc_xprt.h>
43#include <linux/nsproxy.h>
44#include <linux/pid_namespace.h>
45
46
47#include "nfs4_fs.h"
48#include "callback.h"
49#include "delegation.h"
50#include "iostat.h"
51#include "internal.h"
52#include "fscache.h"
53#include "pnfs.h"
54#include "nfs.h"
55#include "netns.h"
56
57#define NFSDBG_FACILITY NFSDBG_CLIENT
58
59static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
60static DEFINE_SPINLOCK(nfs_version_lock);
61static DEFINE_MUTEX(nfs_version_mutex);
62static LIST_HEAD(nfs_versions);
63
64/*
65 * RPC cruft for NFS
66 */
67static const struct rpc_version *nfs_version[5] = {
68 [2] = NULL,
69 [3] = NULL,
70 [4] = NULL,
71};
72
73const struct rpc_program nfs_program = {
74 .name = "nfs",
75 .number = NFS_PROGRAM,
76 .nrvers = ARRAY_SIZE(nfs_version),
77 .version = nfs_version,
78 .stats = &nfs_rpcstat,
79 .pipe_dir_name = NFS_PIPE_DIRNAME,
80};
81
82struct rpc_stat nfs_rpcstat = {
83 .program = &nfs_program
84};
85
86static struct nfs_subversion *find_nfs_version(unsigned int version)
87{
88 struct nfs_subversion *nfs;
89 spin_lock(&nfs_version_lock);
90
91 list_for_each_entry(nfs, &nfs_versions, list) {
92 if (nfs->rpc_ops->version == version) {
93 spin_unlock(&nfs_version_lock);
94 return nfs;
95 }
96 }
97
98 spin_unlock(&nfs_version_lock);
99 return ERR_PTR(-EPROTONOSUPPORT);
100}
101
102struct nfs_subversion *get_nfs_version(unsigned int version)
103{
104 struct nfs_subversion *nfs = find_nfs_version(version);
105
106 if (IS_ERR(nfs)) {
107 mutex_lock(&nfs_version_mutex);
108 request_module("nfsv%d", version);
109 nfs = find_nfs_version(version);
110 mutex_unlock(&nfs_version_mutex);
111 }
112
113 if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
114 return ERR_PTR(-EAGAIN);
115 return nfs;
116}
117
118void put_nfs_version(struct nfs_subversion *nfs)
119{
120 module_put(nfs->owner);
121}
122
123void register_nfs_version(struct nfs_subversion *nfs)
124{
125 spin_lock(&nfs_version_lock);
126
127 list_add(&nfs->list, &nfs_versions);
128 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
129
130 spin_unlock(&nfs_version_lock);
131}
132EXPORT_SYMBOL_GPL(register_nfs_version);
133
134void unregister_nfs_version(struct nfs_subversion *nfs)
135{
136 spin_lock(&nfs_version_lock);
137
138 nfs_version[nfs->rpc_ops->version] = NULL;
139 list_del(&nfs->list);
140
141 spin_unlock(&nfs_version_lock);
142}
143EXPORT_SYMBOL_GPL(unregister_nfs_version);
144
145/*
146 * Allocate a shared client record
147 *
148 * Since these are allocated/deallocated very rarely, we don't
149 * bother putting them in a slab cache...
150 */
151struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
152{
153 struct nfs_client *clp;
154 struct rpc_cred *cred;
155 int err = -ENOMEM;
156
157 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
158 goto error_0;
159
160 clp->cl_nfs_mod = cl_init->nfs_mod;
161 if (!try_module_get(clp->cl_nfs_mod->owner))
162 goto error_dealloc;
163
164 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
165
166 refcount_set(&clp->cl_count, 1);
167 clp->cl_cons_state = NFS_CS_INITING;
168
169 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
170 clp->cl_addrlen = cl_init->addrlen;
171
172 if (cl_init->hostname) {
173 err = -ENOMEM;
174 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
175 if (!clp->cl_hostname)
176 goto error_cleanup;
177 }
178
179 INIT_LIST_HEAD(&clp->cl_superblocks);
180 clp->cl_rpcclient = ERR_PTR(-EINVAL);
181
182 clp->cl_proto = cl_init->proto;
183 clp->cl_net = get_net(cl_init->net);
184
185 cred = rpc_lookup_machine_cred("*");
186 if (!IS_ERR(cred))
187 clp->cl_machine_cred = cred;
188 nfs_fscache_get_client_cookie(clp);
189
190 return clp;
191
192error_cleanup:
193 put_nfs_version(clp->cl_nfs_mod);
194error_dealloc:
195 kfree(clp);
196error_0:
197 return ERR_PTR(err);
198}
199EXPORT_SYMBOL_GPL(nfs_alloc_client);
200
201#if IS_ENABLED(CONFIG_NFS_V4)
202void nfs_cleanup_cb_ident_idr(struct net *net)
203{
204 struct nfs_net *nn = net_generic(net, nfs_net_id);
205
206 idr_destroy(&nn->cb_ident_idr);
207}
208
209/* nfs_client_lock held */
210static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
211{
212 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
213
214 if (clp->cl_cb_ident)
215 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
216}
217
218static void pnfs_init_server(struct nfs_server *server)
219{
220 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
221}
222
223#else
224void nfs_cleanup_cb_ident_idr(struct net *net)
225{
226}
227
228static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
229{
230}
231
232static void pnfs_init_server(struct nfs_server *server)
233{
234}
235
236#endif /* CONFIG_NFS_V4 */
237
238/*
239 * Destroy a shared client record
240 */
241void nfs_free_client(struct nfs_client *clp)
242{
243 nfs_fscache_release_client_cookie(clp);
244
245 /* -EIO all pending I/O */
246 if (!IS_ERR(clp->cl_rpcclient))
247 rpc_shutdown_client(clp->cl_rpcclient);
248
249 if (clp->cl_machine_cred != NULL)
250 put_rpccred(clp->cl_machine_cred);
251
252 put_net(clp->cl_net);
253 put_nfs_version(clp->cl_nfs_mod);
254 kfree(clp->cl_hostname);
255 kfree(clp->cl_acceptor);
256 kfree(clp);
257}
258EXPORT_SYMBOL_GPL(nfs_free_client);
259
260/*
261 * Release a reference to a shared client record
262 */
263void nfs_put_client(struct nfs_client *clp)
264{
265 struct nfs_net *nn;
266
267 if (!clp)
268 return;
269
270 nn = net_generic(clp->cl_net, nfs_net_id);
271
272 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
273 list_del(&clp->cl_share_link);
274 nfs_cb_idr_remove_locked(clp);
275 spin_unlock(&nn->nfs_client_lock);
276
277 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
278
279 clp->rpc_ops->free_client(clp);
280 }
281}
282EXPORT_SYMBOL_GPL(nfs_put_client);
283
284/*
285 * Find an nfs_client on the list that matches the initialisation data
286 * that is supplied.
287 */
288static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
289{
290 struct nfs_client *clp;
291 const struct sockaddr *sap = data->addr;
292 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
293
294again:
295 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
296 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
297 /* Don't match clients that failed to initialise properly */
298 if (clp->cl_cons_state < 0)
299 continue;
300
301 /* If a client is still initializing then we need to wait */
302 if (clp->cl_cons_state > NFS_CS_READY) {
303 refcount_inc(&clp->cl_count);
304 spin_unlock(&nn->nfs_client_lock);
305 nfs_wait_client_init_complete(clp);
306 nfs_put_client(clp);
307 spin_lock(&nn->nfs_client_lock);
308 goto again;
309 }
310
311 /* Different NFS versions cannot share the same nfs_client */
312 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
313 continue;
314
315 if (clp->cl_proto != data->proto)
316 continue;
317 /* Match nfsv4 minorversion */
318 if (clp->cl_minorversion != data->minorversion)
319 continue;
320 /* Match the full socket address */
321 if (!rpc_cmp_addr_port(sap, clap))
322 /* Match all xprt_switch full socket addresses */
323 if (IS_ERR(clp->cl_rpcclient) ||
324 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
325 sap))
326 continue;
327
328 refcount_inc(&clp->cl_count);
329 return clp;
330 }
331 return NULL;
332}
333
334/*
335 * Return true if @clp is done initializing, false if still working on it.
336 *
337 * Use nfs_client_init_status to check if it was successful.
338 */
339bool nfs_client_init_is_complete(const struct nfs_client *clp)
340{
341 return clp->cl_cons_state <= NFS_CS_READY;
342}
343EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
344
345/*
346 * Return 0 if @clp was successfully initialized, -errno otherwise.
347 *
348 * This must be called *after* nfs_client_init_is_complete() returns true,
349 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
350 */
351int nfs_client_init_status(const struct nfs_client *clp)
352{
353 /* called without checking nfs_client_init_is_complete */
354 if (clp->cl_cons_state > NFS_CS_READY) {
355 WARN_ON_ONCE(1);
356 return -EINVAL;
357 }
358 return clp->cl_cons_state;
359}
360EXPORT_SYMBOL_GPL(nfs_client_init_status);
361
362int nfs_wait_client_init_complete(const struct nfs_client *clp)
363{
364 return wait_event_killable(nfs_client_active_wq,
365 nfs_client_init_is_complete(clp));
366}
367EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
368
369/*
370 * Found an existing client. Make sure it's ready before returning.
371 */
372static struct nfs_client *
373nfs_found_client(const struct nfs_client_initdata *cl_init,
374 struct nfs_client *clp)
375{
376 int error;
377
378 error = nfs_wait_client_init_complete(clp);
379 if (error < 0) {
380 nfs_put_client(clp);
381 return ERR_PTR(-ERESTARTSYS);
382 }
383
384 if (clp->cl_cons_state < NFS_CS_READY) {
385 error = clp->cl_cons_state;
386 nfs_put_client(clp);
387 return ERR_PTR(error);
388 }
389
390 smp_rmb();
391 return clp;
392}
393
394/*
395 * Look up a client by IP address and protocol version
396 * - creates a new record if one doesn't yet exist
397 */
398struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
399{
400 struct nfs_client *clp, *new = NULL;
401 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
402 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
403
404 if (cl_init->hostname == NULL) {
405 WARN_ON(1);
406 return NULL;
407 }
408
409 /* see if the client already exists */
410 do {
411 spin_lock(&nn->nfs_client_lock);
412
413 clp = nfs_match_client(cl_init);
414 if (clp) {
415 spin_unlock(&nn->nfs_client_lock);
416 if (new)
417 new->rpc_ops->free_client(new);
418 return nfs_found_client(cl_init, clp);
419 }
420 if (new) {
421 list_add_tail(&new->cl_share_link,
422 &nn->nfs_client_list);
423 spin_unlock(&nn->nfs_client_lock);
424 new->cl_flags = cl_init->init_flags;
425 return rpc_ops->init_client(new, cl_init);
426 }
427
428 spin_unlock(&nn->nfs_client_lock);
429
430 new = rpc_ops->alloc_client(cl_init);
431 } while (!IS_ERR(new));
432
433 return new;
434}
435EXPORT_SYMBOL_GPL(nfs_get_client);
436
437/*
438 * Mark a server as ready or failed
439 */
440void nfs_mark_client_ready(struct nfs_client *clp, int state)
441{
442 smp_wmb();
443 clp->cl_cons_state = state;
444 wake_up_all(&nfs_client_active_wq);
445}
446EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
447
448/*
449 * Initialise the timeout values for a connection
450 */
451void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
452 int timeo, int retrans)
453{
454 to->to_initval = timeo * HZ / 10;
455 to->to_retries = retrans;
456
457 switch (proto) {
458 case XPRT_TRANSPORT_TCP:
459 case XPRT_TRANSPORT_RDMA:
460 if (retrans == NFS_UNSPEC_RETRANS)
461 to->to_retries = NFS_DEF_TCP_RETRANS;
462 if (timeo == NFS_UNSPEC_TIMEO || to->to_retries == 0)
463 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
464 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
465 to->to_initval = NFS_MAX_TCP_TIMEOUT;
466 to->to_increment = to->to_initval;
467 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
468 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
469 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
470 if (to->to_maxval < to->to_initval)
471 to->to_maxval = to->to_initval;
472 to->to_exponential = 0;
473 break;
474 case XPRT_TRANSPORT_UDP:
475 if (retrans == NFS_UNSPEC_RETRANS)
476 to->to_retries = NFS_DEF_UDP_RETRANS;
477 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
478 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
479 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
480 to->to_initval = NFS_MAX_UDP_TIMEOUT;
481 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
482 to->to_exponential = 1;
483 break;
484 default:
485 BUG();
486 }
487}
488EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
489
490/*
491 * Create an RPC client handle
492 */
493int nfs_create_rpc_client(struct nfs_client *clp,
494 const struct nfs_client_initdata *cl_init,
495 rpc_authflavor_t flavor)
496{
497 struct rpc_clnt *clnt = NULL;
498 struct rpc_create_args args = {
499 .net = clp->cl_net,
500 .protocol = clp->cl_proto,
501 .address = (struct sockaddr *)&clp->cl_addr,
502 .addrsize = clp->cl_addrlen,
503 .timeout = cl_init->timeparms,
504 .servername = clp->cl_hostname,
505 .nodename = cl_init->nodename,
506 .program = &nfs_program,
507 .version = clp->rpc_ops->version,
508 .authflavor = flavor,
509 };
510
511 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
512 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
513 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
514 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
515 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
516 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
517 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
518 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
519
520 if (!IS_ERR(clp->cl_rpcclient))
521 return 0;
522
523 clnt = rpc_create(&args);
524 if (IS_ERR(clnt)) {
525 dprintk("%s: cannot create RPC client. Error = %ld\n",
526 __func__, PTR_ERR(clnt));
527 return PTR_ERR(clnt);
528 }
529
530 clp->cl_rpcclient = clnt;
531 return 0;
532}
533EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
534
535/*
536 * Version 2 or 3 client destruction
537 */
538static void nfs_destroy_server(struct nfs_server *server)
539{
540 if (server->nlm_host)
541 nlmclnt_done(server->nlm_host);
542}
543
544/*
545 * Version 2 or 3 lockd setup
546 */
547static int nfs_start_lockd(struct nfs_server *server)
548{
549 struct nlm_host *host;
550 struct nfs_client *clp = server->nfs_client;
551 struct nlmclnt_initdata nlm_init = {
552 .hostname = clp->cl_hostname,
553 .address = (struct sockaddr *)&clp->cl_addr,
554 .addrlen = clp->cl_addrlen,
555 .nfs_version = clp->rpc_ops->version,
556 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
557 1 : 0,
558 .net = clp->cl_net,
559 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
560 };
561
562 if (nlm_init.nfs_version > 3)
563 return 0;
564 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
565 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
566 return 0;
567
568 switch (clp->cl_proto) {
569 default:
570 nlm_init.protocol = IPPROTO_TCP;
571 break;
572 case XPRT_TRANSPORT_UDP:
573 nlm_init.protocol = IPPROTO_UDP;
574 }
575
576 host = nlmclnt_init(&nlm_init);
577 if (IS_ERR(host))
578 return PTR_ERR(host);
579
580 server->nlm_host = host;
581 server->destroy = nfs_destroy_server;
582 return 0;
583}
584
585/*
586 * Create a general RPC client
587 */
588int nfs_init_server_rpcclient(struct nfs_server *server,
589 const struct rpc_timeout *timeo,
590 rpc_authflavor_t pseudoflavour)
591{
592 struct nfs_client *clp = server->nfs_client;
593
594 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
595 pseudoflavour);
596 if (IS_ERR(server->client)) {
597 dprintk("%s: couldn't create rpc_client!\n", __func__);
598 return PTR_ERR(server->client);
599 }
600
601 memcpy(&server->client->cl_timeout_default,
602 timeo,
603 sizeof(server->client->cl_timeout_default));
604 server->client->cl_timeout = &server->client->cl_timeout_default;
605 server->client->cl_softrtry = 0;
606 if (server->flags & NFS_MOUNT_SOFT)
607 server->client->cl_softrtry = 1;
608
609 return 0;
610}
611EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
612
613/**
614 * nfs_init_client - Initialise an NFS2 or NFS3 client
615 *
616 * @clp: nfs_client to initialise
617 * @cl_init: Initialisation parameters
618 *
619 * Returns pointer to an NFS client, or an ERR_PTR value.
620 */
621struct nfs_client *nfs_init_client(struct nfs_client *clp,
622 const struct nfs_client_initdata *cl_init)
623{
624 int error;
625
626 /* the client is already initialised */
627 if (clp->cl_cons_state == NFS_CS_READY)
628 return clp;
629
630 /*
631 * Create a client RPC handle for doing FSSTAT with UNIX auth only
632 * - RFC 2623, sec 2.3.2
633 */
634 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
635 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
636 if (error < 0) {
637 nfs_put_client(clp);
638 clp = ERR_PTR(error);
639 }
640 return clp;
641}
642EXPORT_SYMBOL_GPL(nfs_init_client);
643
644/*
645 * Create a version 2 or 3 client
646 */
647static int nfs_init_server(struct nfs_server *server,
648 const struct nfs_parsed_mount_data *data,
649 struct nfs_subversion *nfs_mod)
650{
651 struct rpc_timeout timeparms;
652 struct nfs_client_initdata cl_init = {
653 .hostname = data->nfs_server.hostname,
654 .addr = (const struct sockaddr *)&data->nfs_server.address,
655 .addrlen = data->nfs_server.addrlen,
656 .nfs_mod = nfs_mod,
657 .proto = data->nfs_server.protocol,
658 .net = data->net,
659 .timeparms = &timeparms,
660 };
661 struct nfs_client *clp;
662 int error;
663
664 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
665 data->timeo, data->retrans);
666 if (data->flags & NFS_MOUNT_NORESVPORT)
667 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
668
669 /* Allocate or find a client reference we can use */
670 clp = nfs_get_client(&cl_init);
671 if (IS_ERR(clp))
672 return PTR_ERR(clp);
673
674 server->nfs_client = clp;
675
676 /* Initialise the client representation from the mount data */
677 server->flags = data->flags;
678 server->options = data->options;
679 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
680 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
681 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
682
683 if (data->rsize)
684 server->rsize = nfs_block_size(data->rsize, NULL);
685 if (data->wsize)
686 server->wsize = nfs_block_size(data->wsize, NULL);
687
688 server->acregmin = data->acregmin * HZ;
689 server->acregmax = data->acregmax * HZ;
690 server->acdirmin = data->acdirmin * HZ;
691 server->acdirmax = data->acdirmax * HZ;
692
693 /* Start lockd here, before we might error out */
694 error = nfs_start_lockd(server);
695 if (error < 0)
696 goto error;
697
698 server->port = data->nfs_server.port;
699 server->auth_info = data->auth_info;
700
701 error = nfs_init_server_rpcclient(server, &timeparms,
702 data->selected_flavor);
703 if (error < 0)
704 goto error;
705
706 /* Preserve the values of mount_server-related mount options */
707 if (data->mount_server.addrlen) {
708 memcpy(&server->mountd_address, &data->mount_server.address,
709 data->mount_server.addrlen);
710 server->mountd_addrlen = data->mount_server.addrlen;
711 }
712 server->mountd_version = data->mount_server.version;
713 server->mountd_port = data->mount_server.port;
714 server->mountd_protocol = data->mount_server.protocol;
715
716 server->namelen = data->namlen;
717 return 0;
718
719error:
720 server->nfs_client = NULL;
721 nfs_put_client(clp);
722 return error;
723}
724
725/*
726 * Load up the server record from information gained in an fsinfo record
727 */
728static void nfs_server_set_fsinfo(struct nfs_server *server,
729 struct nfs_fsinfo *fsinfo)
730{
731 unsigned long max_rpc_payload;
732
733 /* Work out a lot of parameters */
734 if (server->rsize == 0)
735 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
736 if (server->wsize == 0)
737 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
738
739 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
740 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
741 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
742 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
743
744 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
745 if (server->rsize > max_rpc_payload)
746 server->rsize = max_rpc_payload;
747 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
748 server->rsize = NFS_MAX_FILE_IO_SIZE;
749 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
750
751 if (server->wsize > max_rpc_payload)
752 server->wsize = max_rpc_payload;
753 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
754 server->wsize = NFS_MAX_FILE_IO_SIZE;
755 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
756
757 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
758
759 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
760 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES)
761 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES;
762 if (server->dtsize > server->rsize)
763 server->dtsize = server->rsize;
764
765 if (server->flags & NFS_MOUNT_NOAC) {
766 server->acregmin = server->acregmax = 0;
767 server->acdirmin = server->acdirmax = 0;
768 }
769
770 server->maxfilesize = fsinfo->maxfilesize;
771
772 server->time_delta = fsinfo->time_delta;
773
774 server->clone_blksize = fsinfo->clone_blksize;
775 /* We're airborne Set socket buffersize */
776 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
777}
778
779/*
780 * Probe filesystem information, including the FSID on v2/v3
781 */
782int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
783{
784 struct nfs_fsinfo fsinfo;
785 struct nfs_client *clp = server->nfs_client;
786 int error;
787
788 if (clp->rpc_ops->set_capabilities != NULL) {
789 error = clp->rpc_ops->set_capabilities(server, mntfh);
790 if (error < 0)
791 return error;
792 }
793
794 fsinfo.fattr = fattr;
795 fsinfo.nlayouttypes = 0;
796 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
797 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
798 if (error < 0)
799 return error;
800
801 nfs_server_set_fsinfo(server, &fsinfo);
802
803 /* Get some general file system info */
804 if (server->namelen == 0) {
805 struct nfs_pathconf pathinfo;
806
807 pathinfo.fattr = fattr;
808 nfs_fattr_init(fattr);
809
810 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
811 server->namelen = pathinfo.max_namelen;
812 }
813
814 return 0;
815}
816EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
817
818/*
819 * Copy useful information when duplicating a server record
820 */
821void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
822{
823 target->flags = source->flags;
824 target->rsize = source->rsize;
825 target->wsize = source->wsize;
826 target->acregmin = source->acregmin;
827 target->acregmax = source->acregmax;
828 target->acdirmin = source->acdirmin;
829 target->acdirmax = source->acdirmax;
830 target->caps = source->caps;
831 target->options = source->options;
832 target->auth_info = source->auth_info;
833 target->port = source->port;
834}
835EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
836
837void nfs_server_insert_lists(struct nfs_server *server)
838{
839 struct nfs_client *clp = server->nfs_client;
840 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
841
842 spin_lock(&nn->nfs_client_lock);
843 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
844 list_add_tail(&server->master_link, &nn->nfs_volume_list);
845 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
846 spin_unlock(&nn->nfs_client_lock);
847
848}
849EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
850
851void nfs_server_remove_lists(struct nfs_server *server)
852{
853 struct nfs_client *clp = server->nfs_client;
854 struct nfs_net *nn;
855
856 if (clp == NULL)
857 return;
858 nn = net_generic(clp->cl_net, nfs_net_id);
859 spin_lock(&nn->nfs_client_lock);
860 list_del_rcu(&server->client_link);
861 if (list_empty(&clp->cl_superblocks))
862 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
863 list_del(&server->master_link);
864 spin_unlock(&nn->nfs_client_lock);
865
866 synchronize_rcu();
867}
868EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
869
870/*
871 * Allocate and initialise a server record
872 */
873struct nfs_server *nfs_alloc_server(void)
874{
875 struct nfs_server *server;
876
877 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
878 if (!server)
879 return NULL;
880
881 server->client = server->client_acl = ERR_PTR(-EINVAL);
882
883 /* Zero out the NFS state stuff */
884 INIT_LIST_HEAD(&server->client_link);
885 INIT_LIST_HEAD(&server->master_link);
886 INIT_LIST_HEAD(&server->delegations);
887 INIT_LIST_HEAD(&server->layouts);
888 INIT_LIST_HEAD(&server->state_owners_lru);
889
890 atomic_set(&server->active, 0);
891
892 server->io_stats = nfs_alloc_iostats();
893 if (!server->io_stats) {
894 kfree(server);
895 return NULL;
896 }
897
898 ida_init(&server->openowner_id);
899 ida_init(&server->lockowner_id);
900 pnfs_init_server(server);
901 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
902
903 return server;
904}
905EXPORT_SYMBOL_GPL(nfs_alloc_server);
906
907/*
908 * Free up a server record
909 */
910void nfs_free_server(struct nfs_server *server)
911{
912 nfs_server_remove_lists(server);
913
914 if (server->destroy != NULL)
915 server->destroy(server);
916
917 if (!IS_ERR(server->client_acl))
918 rpc_shutdown_client(server->client_acl);
919 if (!IS_ERR(server->client))
920 rpc_shutdown_client(server->client);
921
922 nfs_put_client(server->nfs_client);
923
924 ida_destroy(&server->lockowner_id);
925 ida_destroy(&server->openowner_id);
926 nfs_free_iostats(server->io_stats);
927 kfree(server);
928 nfs_release_automount_timer();
929}
930EXPORT_SYMBOL_GPL(nfs_free_server);
931
932/*
933 * Create a version 2 or 3 volume record
934 * - keyed on server and FSID
935 */
936struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
937 struct nfs_subversion *nfs_mod)
938{
939 struct nfs_server *server;
940 struct nfs_fattr *fattr;
941 int error;
942
943 server = nfs_alloc_server();
944 if (!server)
945 return ERR_PTR(-ENOMEM);
946
947 error = -ENOMEM;
948 fattr = nfs_alloc_fattr();
949 if (fattr == NULL)
950 goto error;
951
952 /* Get a client representation */
953 error = nfs_init_server(server, mount_info->parsed, nfs_mod);
954 if (error < 0)
955 goto error;
956
957 /* Probe the root fh to retrieve its FSID */
958 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
959 if (error < 0)
960 goto error;
961 if (server->nfs_client->rpc_ops->version == 3) {
962 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
963 server->namelen = NFS3_MAXNAMLEN;
964 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
965 server->caps |= NFS_CAP_READDIRPLUS;
966 } else {
967 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
968 server->namelen = NFS2_MAXNAMLEN;
969 }
970
971 if (!(fattr->valid & NFS_ATTR_FATTR)) {
972 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
973 if (error < 0) {
974 dprintk("nfs_create_server: getattr error = %d\n", -error);
975 goto error;
976 }
977 }
978 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
979
980 dprintk("Server FSID: %llx:%llx\n",
981 (unsigned long long) server->fsid.major,
982 (unsigned long long) server->fsid.minor);
983
984 nfs_server_insert_lists(server);
985 server->mount_time = jiffies;
986 nfs_free_fattr(fattr);
987 return server;
988
989error:
990 nfs_free_fattr(fattr);
991 nfs_free_server(server);
992 return ERR_PTR(error);
993}
994EXPORT_SYMBOL_GPL(nfs_create_server);
995
996/*
997 * Clone an NFS2, NFS3 or NFS4 server record
998 */
999struct nfs_server *nfs_clone_server(struct nfs_server *source,
1000 struct nfs_fh *fh,
1001 struct nfs_fattr *fattr,
1002 rpc_authflavor_t flavor)
1003{
1004 struct nfs_server *server;
1005 struct nfs_fattr *fattr_fsinfo;
1006 int error;
1007
1008 server = nfs_alloc_server();
1009 if (!server)
1010 return ERR_PTR(-ENOMEM);
1011
1012 error = -ENOMEM;
1013 fattr_fsinfo = nfs_alloc_fattr();
1014 if (fattr_fsinfo == NULL)
1015 goto out_free_server;
1016
1017 /* Copy data from the source */
1018 server->nfs_client = source->nfs_client;
1019 server->destroy = source->destroy;
1020 refcount_inc(&server->nfs_client->cl_count);
1021 nfs_server_copy_userdata(server, source);
1022
1023 server->fsid = fattr->fsid;
1024
1025 error = nfs_init_server_rpcclient(server,
1026 source->client->cl_timeout,
1027 flavor);
1028 if (error < 0)
1029 goto out_free_server;
1030
1031 /* probe the filesystem info for this server filesystem */
1032 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1033 if (error < 0)
1034 goto out_free_server;
1035
1036 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1037 server->namelen = NFS4_MAXNAMLEN;
1038
1039 error = nfs_start_lockd(server);
1040 if (error < 0)
1041 goto out_free_server;
1042
1043 nfs_server_insert_lists(server);
1044 server->mount_time = jiffies;
1045
1046 nfs_free_fattr(fattr_fsinfo);
1047 return server;
1048
1049out_free_server:
1050 nfs_free_fattr(fattr_fsinfo);
1051 nfs_free_server(server);
1052 return ERR_PTR(error);
1053}
1054EXPORT_SYMBOL_GPL(nfs_clone_server);
1055
1056void nfs_clients_init(struct net *net)
1057{
1058 struct nfs_net *nn = net_generic(net, nfs_net_id);
1059
1060 INIT_LIST_HEAD(&nn->nfs_client_list);
1061 INIT_LIST_HEAD(&nn->nfs_volume_list);
1062#if IS_ENABLED(CONFIG_NFS_V4)
1063 idr_init(&nn->cb_ident_idr);
1064#endif
1065 spin_lock_init(&nn->nfs_client_lock);
1066 nn->boot_time = ktime_get_real();
1067}
1068
1069#ifdef CONFIG_PROC_FS
1070static int nfs_server_list_open(struct inode *inode, struct file *file);
1071static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1072static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1073static void nfs_server_list_stop(struct seq_file *p, void *v);
1074static int nfs_server_list_show(struct seq_file *m, void *v);
1075
1076static const struct seq_operations nfs_server_list_ops = {
1077 .start = nfs_server_list_start,
1078 .next = nfs_server_list_next,
1079 .stop = nfs_server_list_stop,
1080 .show = nfs_server_list_show,
1081};
1082
1083static const struct file_operations nfs_server_list_fops = {
1084 .open = nfs_server_list_open,
1085 .read = seq_read,
1086 .llseek = seq_lseek,
1087 .release = seq_release_net,
1088};
1089
1090static int nfs_volume_list_open(struct inode *inode, struct file *file);
1091static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1092static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1093static void nfs_volume_list_stop(struct seq_file *p, void *v);
1094static int nfs_volume_list_show(struct seq_file *m, void *v);
1095
1096static const struct seq_operations nfs_volume_list_ops = {
1097 .start = nfs_volume_list_start,
1098 .next = nfs_volume_list_next,
1099 .stop = nfs_volume_list_stop,
1100 .show = nfs_volume_list_show,
1101};
1102
1103static const struct file_operations nfs_volume_list_fops = {
1104 .open = nfs_volume_list_open,
1105 .read = seq_read,
1106 .llseek = seq_lseek,
1107 .release = seq_release_net,
1108};
1109
1110/*
1111 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1112 * we're dealing
1113 */
1114static int nfs_server_list_open(struct inode *inode, struct file *file)
1115{
1116 return seq_open_net(inode, file, &nfs_server_list_ops,
1117 sizeof(struct seq_net_private));
1118}
1119
1120/*
1121 * set up the iterator to start reading from the server list and return the first item
1122 */
1123static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1124 __acquires(&nn->nfs_client_lock)
1125{
1126 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1127
1128 /* lock the list against modification */
1129 spin_lock(&nn->nfs_client_lock);
1130 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1131}
1132
1133/*
1134 * move to next server
1135 */
1136static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1137{
1138 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1139
1140 return seq_list_next(v, &nn->nfs_client_list, pos);
1141}
1142
1143/*
1144 * clean up after reading from the transports list
1145 */
1146static void nfs_server_list_stop(struct seq_file *p, void *v)
1147 __releases(&nn->nfs_client_lock)
1148{
1149 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1150
1151 spin_unlock(&nn->nfs_client_lock);
1152}
1153
1154/*
1155 * display a header line followed by a load of call lines
1156 */
1157static int nfs_server_list_show(struct seq_file *m, void *v)
1158{
1159 struct nfs_client *clp;
1160 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1161
1162 /* display header on line 1 */
1163 if (v == &nn->nfs_client_list) {
1164 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1165 return 0;
1166 }
1167
1168 /* display one transport per line on subsequent lines */
1169 clp = list_entry(v, struct nfs_client, cl_share_link);
1170
1171 /* Check if the client is initialized */
1172 if (clp->cl_cons_state != NFS_CS_READY)
1173 return 0;
1174
1175 rcu_read_lock();
1176 seq_printf(m, "v%u %s %s %3d %s\n",
1177 clp->rpc_ops->version,
1178 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1179 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1180 refcount_read(&clp->cl_count),
1181 clp->cl_hostname);
1182 rcu_read_unlock();
1183
1184 return 0;
1185}
1186
1187/*
1188 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1189 */
1190static int nfs_volume_list_open(struct inode *inode, struct file *file)
1191{
1192 return seq_open_net(inode, file, &nfs_volume_list_ops,
1193 sizeof(struct seq_net_private));
1194}
1195
1196/*
1197 * set up the iterator to start reading from the volume list and return the first item
1198 */
1199static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1200 __acquires(&nn->nfs_client_lock)
1201{
1202 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1203
1204 /* lock the list against modification */
1205 spin_lock(&nn->nfs_client_lock);
1206 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1207}
1208
1209/*
1210 * move to next volume
1211 */
1212static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1213{
1214 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1215
1216 return seq_list_next(v, &nn->nfs_volume_list, pos);
1217}
1218
1219/*
1220 * clean up after reading from the transports list
1221 */
1222static void nfs_volume_list_stop(struct seq_file *p, void *v)
1223 __releases(&nn->nfs_client_lock)
1224{
1225 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1226
1227 spin_unlock(&nn->nfs_client_lock);
1228}
1229
1230/*
1231 * display a header line followed by a load of call lines
1232 */
1233static int nfs_volume_list_show(struct seq_file *m, void *v)
1234{
1235 struct nfs_server *server;
1236 struct nfs_client *clp;
1237 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1238 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1239 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1240
1241 /* display header on line 1 */
1242 if (v == &nn->nfs_volume_list) {
1243 seq_puts(m, "NV SERVER PORT DEV FSID"
1244 " FSC\n");
1245 return 0;
1246 }
1247 /* display one transport per line on subsequent lines */
1248 server = list_entry(v, struct nfs_server, master_link);
1249 clp = server->nfs_client;
1250
1251 snprintf(dev, sizeof(dev), "%u:%u",
1252 MAJOR(server->s_dev), MINOR(server->s_dev));
1253
1254 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1255 (unsigned long long) server->fsid.major,
1256 (unsigned long long) server->fsid.minor);
1257
1258 rcu_read_lock();
1259 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1260 clp->rpc_ops->version,
1261 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1262 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1263 dev,
1264 fsid,
1265 nfs_server_fscache_state(server));
1266 rcu_read_unlock();
1267
1268 return 0;
1269}
1270
1271int nfs_fs_proc_net_init(struct net *net)
1272{
1273 struct nfs_net *nn = net_generic(net, nfs_net_id);
1274 struct proc_dir_entry *p;
1275
1276 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1277 if (!nn->proc_nfsfs)
1278 goto error_0;
1279
1280 /* a file of servers with which we're dealing */
1281 p = proc_create("servers", S_IFREG|S_IRUGO,
1282 nn->proc_nfsfs, &nfs_server_list_fops);
1283 if (!p)
1284 goto error_1;
1285
1286 /* a file of volumes that we have mounted */
1287 p = proc_create("volumes", S_IFREG|S_IRUGO,
1288 nn->proc_nfsfs, &nfs_volume_list_fops);
1289 if (!p)
1290 goto error_1;
1291 return 0;
1292
1293error_1:
1294 remove_proc_subtree("nfsfs", net->proc_net);
1295error_0:
1296 return -ENOMEM;
1297}
1298
1299void nfs_fs_proc_net_exit(struct net *net)
1300{
1301 remove_proc_subtree("nfsfs", net->proc_net);
1302}
1303
1304/*
1305 * initialise the /proc/fs/nfsfs/ directory
1306 */
1307int __init nfs_fs_proc_init(void)
1308{
1309 if (!proc_mkdir("fs/nfsfs", NULL))
1310 goto error_0;
1311
1312 /* a file of servers with which we're dealing */
1313 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1314 goto error_1;
1315
1316 /* a file of volumes that we have mounted */
1317 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1318 goto error_1;
1319
1320 return 0;
1321error_1:
1322 remove_proc_subtree("fs/nfsfs", NULL);
1323error_0:
1324 return -ENOMEM;
1325}
1326
1327/*
1328 * clean up the /proc/fs/nfsfs/ directory
1329 */
1330void nfs_fs_proc_exit(void)
1331{
1332 remove_proc_subtree("fs/nfsfs", NULL);
1333}
1334
1335#endif /* CONFIG_PROC_FS */
1/* 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/clnt.h>
24#include <linux/sunrpc/stats.h>
25#include <linux/sunrpc/metrics.h>
26#include <linux/sunrpc/xprtsock.h>
27#include <linux/sunrpc/xprtrdma.h>
28#include <linux/nfs_fs.h>
29#include <linux/nfs_mount.h>
30#include <linux/nfs4_mount.h>
31#include <linux/lockd/bind.h>
32#include <linux/seq_file.h>
33#include <linux/mount.h>
34#include <linux/nfs_idmap.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))
114 try_module_get(nfs->owner);
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 try_module_get(clp->cl_nfs_mod->owner);
162
163 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
164
165 atomic_set(&clp->cl_count, 1);
166 clp->cl_cons_state = NFS_CS_INITING;
167
168 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
169 clp->cl_addrlen = cl_init->addrlen;
170
171 if (cl_init->hostname) {
172 err = -ENOMEM;
173 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
174 if (!clp->cl_hostname)
175 goto error_cleanup;
176 }
177
178 INIT_LIST_HEAD(&clp->cl_superblocks);
179 clp->cl_rpcclient = ERR_PTR(-EINVAL);
180
181 clp->cl_proto = cl_init->proto;
182 clp->cl_net = get_net(cl_init->net);
183
184 cred = rpc_lookup_machine_cred("*");
185 if (!IS_ERR(cred))
186 clp->cl_machine_cred = cred;
187 nfs_fscache_get_client_cookie(clp);
188
189 return clp;
190
191error_cleanup:
192 put_nfs_version(clp->cl_nfs_mod);
193 kfree(clp);
194error_0:
195 return ERR_PTR(err);
196}
197EXPORT_SYMBOL_GPL(nfs_alloc_client);
198
199#if IS_ENABLED(CONFIG_NFS_V4)
200void nfs_cleanup_cb_ident_idr(struct net *net)
201{
202 struct nfs_net *nn = net_generic(net, nfs_net_id);
203
204 idr_destroy(&nn->cb_ident_idr);
205}
206
207/* nfs_client_lock held */
208static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
209{
210 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
211
212 if (clp->cl_cb_ident)
213 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
214}
215
216static void pnfs_init_server(struct nfs_server *server)
217{
218 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
219}
220
221#else
222void nfs_cleanup_cb_ident_idr(struct net *net)
223{
224}
225
226static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
227{
228}
229
230static void pnfs_init_server(struct nfs_server *server)
231{
232}
233
234#endif /* CONFIG_NFS_V4 */
235
236/*
237 * Destroy a shared client record
238 */
239void nfs_free_client(struct nfs_client *clp)
240{
241 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
242
243 nfs_fscache_release_client_cookie(clp);
244
245 /* -EIO all pending I/O */
246 if (!IS_ERR(clp->cl_rpcclient))
247 rpc_shutdown_client(clp->cl_rpcclient);
248
249 if (clp->cl_machine_cred != NULL)
250 put_rpccred(clp->cl_machine_cred);
251
252 put_net(clp->cl_net);
253 put_nfs_version(clp->cl_nfs_mod);
254 kfree(clp->cl_hostname);
255 kfree(clp);
256
257 dprintk("<-- nfs_free_client()\n");
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 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
272 nn = net_generic(clp->cl_net, nfs_net_id);
273
274 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
275 list_del(&clp->cl_share_link);
276 nfs_cb_idr_remove_locked(clp);
277 spin_unlock(&nn->nfs_client_lock);
278
279 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
280
281 clp->rpc_ops->free_client(clp);
282 }
283}
284EXPORT_SYMBOL_GPL(nfs_put_client);
285
286#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
287/*
288 * Test if two ip6 socket addresses refer to the same socket by
289 * comparing relevant fields. The padding bytes specifically, are not
290 * compared. sin6_flowinfo is not compared because it only affects QoS
291 * and sin6_scope_id is only compared if the address is "link local"
292 * because "link local" addresses need only be unique to a specific
293 * link. Conversely, ordinary unicast addresses might have different
294 * sin6_scope_id.
295 *
296 * The caller should ensure both socket addresses are AF_INET6.
297 */
298static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
299 const struct sockaddr *sa2)
300{
301 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
302 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
303
304 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
305 return 0;
306 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
307 return sin1->sin6_scope_id == sin2->sin6_scope_id;
308
309 return 1;
310}
311#else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
312static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
313 const struct sockaddr *sa2)
314{
315 return 0;
316}
317#endif
318
319/*
320 * Test if two ip4 socket addresses refer to the same socket, by
321 * comparing relevant fields. The padding bytes specifically, are
322 * not compared.
323 *
324 * The caller should ensure both socket addresses are AF_INET.
325 */
326static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
327 const struct sockaddr *sa2)
328{
329 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
330 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
331
332 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
333}
334
335static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
336 const struct sockaddr *sa2)
337{
338 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
339 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
340
341 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
342 (sin1->sin6_port == sin2->sin6_port);
343}
344
345static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
346 const struct sockaddr *sa2)
347{
348 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
349 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
350
351 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
352 (sin1->sin_port == sin2->sin_port);
353}
354
355#if defined(CONFIG_NFS_V4_1)
356/*
357 * Test if two socket addresses represent the same actual socket,
358 * by comparing (only) relevant fields, excluding the port number.
359 */
360int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
361 const struct sockaddr *sa2)
362{
363 if (sa1->sa_family != sa2->sa_family)
364 return 0;
365
366 switch (sa1->sa_family) {
367 case AF_INET:
368 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
369 case AF_INET6:
370 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
371 }
372 return 0;
373}
374EXPORT_SYMBOL_GPL(nfs_sockaddr_match_ipaddr);
375#endif /* CONFIG_NFS_V4_1 */
376
377/*
378 * Test if two socket addresses represent the same actual socket,
379 * by comparing (only) relevant fields, including the port number.
380 */
381static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
382 const struct sockaddr *sa2)
383{
384 if (sa1->sa_family != sa2->sa_family)
385 return 0;
386
387 switch (sa1->sa_family) {
388 case AF_INET:
389 return nfs_sockaddr_cmp_ip4(sa1, sa2);
390 case AF_INET6:
391 return nfs_sockaddr_cmp_ip6(sa1, sa2);
392 }
393 return 0;
394}
395
396/*
397 * Find an nfs_client on the list that matches the initialisation data
398 * that is supplied.
399 */
400static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
401{
402 struct nfs_client *clp;
403 const struct sockaddr *sap = data->addr;
404 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
405
406 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
407 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
408 /* Don't match clients that failed to initialise properly */
409 if (clp->cl_cons_state < 0)
410 continue;
411
412 /* Different NFS versions cannot share the same nfs_client */
413 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
414 continue;
415
416 if (clp->cl_proto != data->proto)
417 continue;
418 /* Match nfsv4 minorversion */
419 if (clp->cl_minorversion != data->minorversion)
420 continue;
421 /* Match the full socket address */
422 if (!nfs_sockaddr_cmp(sap, clap))
423 continue;
424
425 atomic_inc(&clp->cl_count);
426 return clp;
427 }
428 return NULL;
429}
430
431static bool nfs_client_init_is_complete(const struct nfs_client *clp)
432{
433 return clp->cl_cons_state != NFS_CS_INITING;
434}
435
436int nfs_wait_client_init_complete(const struct nfs_client *clp)
437{
438 return wait_event_killable(nfs_client_active_wq,
439 nfs_client_init_is_complete(clp));
440}
441EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
442
443/*
444 * Found an existing client. Make sure it's ready before returning.
445 */
446static struct nfs_client *
447nfs_found_client(const struct nfs_client_initdata *cl_init,
448 struct nfs_client *clp)
449{
450 int error;
451
452 error = nfs_wait_client_init_complete(clp);
453 if (error < 0) {
454 nfs_put_client(clp);
455 return ERR_PTR(-ERESTARTSYS);
456 }
457
458 if (clp->cl_cons_state < NFS_CS_READY) {
459 error = clp->cl_cons_state;
460 nfs_put_client(clp);
461 return ERR_PTR(error);
462 }
463
464 smp_rmb();
465
466 dprintk("<-- %s found nfs_client %p for %s\n",
467 __func__, clp, cl_init->hostname ?: "");
468 return clp;
469}
470
471/*
472 * Look up a client by IP address and protocol version
473 * - creates a new record if one doesn't yet exist
474 */
475struct nfs_client *
476nfs_get_client(const struct nfs_client_initdata *cl_init,
477 const struct rpc_timeout *timeparms,
478 const char *ip_addr,
479 rpc_authflavor_t authflavour)
480{
481 struct nfs_client *clp, *new = NULL;
482 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
483 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
484
485 dprintk("--> nfs_get_client(%s,v%u)\n",
486 cl_init->hostname ?: "", rpc_ops->version);
487
488 /* see if the client already exists */
489 do {
490 spin_lock(&nn->nfs_client_lock);
491
492 clp = nfs_match_client(cl_init);
493 if (clp) {
494 spin_unlock(&nn->nfs_client_lock);
495 if (new)
496 new->rpc_ops->free_client(new);
497 return nfs_found_client(cl_init, clp);
498 }
499 if (new) {
500 list_add_tail(&new->cl_share_link,
501 &nn->nfs_client_list);
502 spin_unlock(&nn->nfs_client_lock);
503 new->cl_flags = cl_init->init_flags;
504 return rpc_ops->init_client(new, timeparms, ip_addr);
505 }
506
507 spin_unlock(&nn->nfs_client_lock);
508
509 new = rpc_ops->alloc_client(cl_init);
510 } while (!IS_ERR(new));
511
512 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
513 cl_init->hostname ?: "", PTR_ERR(new));
514 return new;
515}
516EXPORT_SYMBOL_GPL(nfs_get_client);
517
518/*
519 * Mark a server as ready or failed
520 */
521void nfs_mark_client_ready(struct nfs_client *clp, int state)
522{
523 smp_wmb();
524 clp->cl_cons_state = state;
525 wake_up_all(&nfs_client_active_wq);
526}
527EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
528
529/*
530 * Initialise the timeout values for a connection
531 */
532void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
533 unsigned int timeo, unsigned int retrans)
534{
535 to->to_initval = timeo * HZ / 10;
536 to->to_retries = retrans;
537
538 switch (proto) {
539 case XPRT_TRANSPORT_TCP:
540 case XPRT_TRANSPORT_RDMA:
541 if (to->to_retries == 0)
542 to->to_retries = NFS_DEF_TCP_RETRANS;
543 if (to->to_initval == 0)
544 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
545 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
546 to->to_initval = NFS_MAX_TCP_TIMEOUT;
547 to->to_increment = to->to_initval;
548 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
549 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
550 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
551 if (to->to_maxval < to->to_initval)
552 to->to_maxval = to->to_initval;
553 to->to_exponential = 0;
554 break;
555 case XPRT_TRANSPORT_UDP:
556 if (to->to_retries == 0)
557 to->to_retries = NFS_DEF_UDP_RETRANS;
558 if (!to->to_initval)
559 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
560 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
561 to->to_initval = NFS_MAX_UDP_TIMEOUT;
562 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
563 to->to_exponential = 1;
564 break;
565 default:
566 BUG();
567 }
568}
569EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
570
571/*
572 * Create an RPC client handle
573 */
574int nfs_create_rpc_client(struct nfs_client *clp,
575 const struct rpc_timeout *timeparms,
576 rpc_authflavor_t flavor)
577{
578 struct rpc_clnt *clnt = NULL;
579 struct rpc_create_args args = {
580 .net = clp->cl_net,
581 .protocol = clp->cl_proto,
582 .address = (struct sockaddr *)&clp->cl_addr,
583 .addrsize = clp->cl_addrlen,
584 .timeout = timeparms,
585 .servername = clp->cl_hostname,
586 .program = &nfs_program,
587 .version = clp->rpc_ops->version,
588 .authflavor = flavor,
589 };
590
591 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
592 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
593 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
594 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
595 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
596 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
597 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
598 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
599
600 if (!IS_ERR(clp->cl_rpcclient))
601 return 0;
602
603 clnt = rpc_create(&args);
604 if (IS_ERR(clnt)) {
605 dprintk("%s: cannot create RPC client. Error = %ld\n",
606 __func__, PTR_ERR(clnt));
607 return PTR_ERR(clnt);
608 }
609
610 clp->cl_rpcclient = clnt;
611 return 0;
612}
613EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
614
615/*
616 * Version 2 or 3 client destruction
617 */
618static void nfs_destroy_server(struct nfs_server *server)
619{
620 if (server->nlm_host)
621 nlmclnt_done(server->nlm_host);
622}
623
624/*
625 * Version 2 or 3 lockd setup
626 */
627static int nfs_start_lockd(struct nfs_server *server)
628{
629 struct nlm_host *host;
630 struct nfs_client *clp = server->nfs_client;
631 struct nlmclnt_initdata nlm_init = {
632 .hostname = clp->cl_hostname,
633 .address = (struct sockaddr *)&clp->cl_addr,
634 .addrlen = clp->cl_addrlen,
635 .nfs_version = clp->rpc_ops->version,
636 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
637 1 : 0,
638 .net = clp->cl_net,
639 };
640
641 if (nlm_init.nfs_version > 3)
642 return 0;
643 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
644 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
645 return 0;
646
647 switch (clp->cl_proto) {
648 default:
649 nlm_init.protocol = IPPROTO_TCP;
650 break;
651 case XPRT_TRANSPORT_UDP:
652 nlm_init.protocol = IPPROTO_UDP;
653 }
654
655 host = nlmclnt_init(&nlm_init);
656 if (IS_ERR(host))
657 return PTR_ERR(host);
658
659 server->nlm_host = host;
660 server->destroy = nfs_destroy_server;
661 return 0;
662}
663
664/*
665 * Create a general RPC client
666 */
667int nfs_init_server_rpcclient(struct nfs_server *server,
668 const struct rpc_timeout *timeo,
669 rpc_authflavor_t pseudoflavour)
670{
671 struct nfs_client *clp = server->nfs_client;
672
673 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
674 pseudoflavour);
675 if (IS_ERR(server->client)) {
676 dprintk("%s: couldn't create rpc_client!\n", __func__);
677 return PTR_ERR(server->client);
678 }
679
680 memcpy(&server->client->cl_timeout_default,
681 timeo,
682 sizeof(server->client->cl_timeout_default));
683 server->client->cl_timeout = &server->client->cl_timeout_default;
684 server->client->cl_softrtry = 0;
685 if (server->flags & NFS_MOUNT_SOFT)
686 server->client->cl_softrtry = 1;
687
688 return 0;
689}
690EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
691
692/**
693 * nfs_init_client - Initialise an NFS2 or NFS3 client
694 *
695 * @clp: nfs_client to initialise
696 * @timeparms: timeout parameters for underlying RPC transport
697 * @ip_addr: IP presentation address (not used)
698 *
699 * Returns pointer to an NFS client, or an ERR_PTR value.
700 */
701struct nfs_client *nfs_init_client(struct nfs_client *clp,
702 const struct rpc_timeout *timeparms,
703 const char *ip_addr)
704{
705 int error;
706
707 if (clp->cl_cons_state == NFS_CS_READY) {
708 /* the client is already initialised */
709 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
710 return clp;
711 }
712
713 /*
714 * Create a client RPC handle for doing FSSTAT with UNIX auth only
715 * - RFC 2623, sec 2.3.2
716 */
717 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
718 if (error < 0)
719 goto error;
720 nfs_mark_client_ready(clp, NFS_CS_READY);
721 return clp;
722
723error:
724 nfs_mark_client_ready(clp, error);
725 nfs_put_client(clp);
726 dprintk("<-- nfs_init_client() = xerror %d\n", error);
727 return ERR_PTR(error);
728}
729EXPORT_SYMBOL_GPL(nfs_init_client);
730
731/*
732 * Create a version 2 or 3 client
733 */
734static int nfs_init_server(struct nfs_server *server,
735 const struct nfs_parsed_mount_data *data,
736 struct nfs_subversion *nfs_mod)
737{
738 struct nfs_client_initdata cl_init = {
739 .hostname = data->nfs_server.hostname,
740 .addr = (const struct sockaddr *)&data->nfs_server.address,
741 .addrlen = data->nfs_server.addrlen,
742 .nfs_mod = nfs_mod,
743 .proto = data->nfs_server.protocol,
744 .net = data->net,
745 };
746 struct rpc_timeout timeparms;
747 struct nfs_client *clp;
748 int error;
749
750 dprintk("--> nfs_init_server()\n");
751
752 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
753 data->timeo, data->retrans);
754 if (data->flags & NFS_MOUNT_NORESVPORT)
755 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
756
757 /* Allocate or find a client reference we can use */
758 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX);
759 if (IS_ERR(clp)) {
760 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
761 return PTR_ERR(clp);
762 }
763
764 server->nfs_client = clp;
765
766 /* Initialise the client representation from the mount data */
767 server->flags = data->flags;
768 server->options = data->options;
769 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
770 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
771 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR;
772
773 if (data->rsize)
774 server->rsize = nfs_block_size(data->rsize, NULL);
775 if (data->wsize)
776 server->wsize = nfs_block_size(data->wsize, NULL);
777
778 server->acregmin = data->acregmin * HZ;
779 server->acregmax = data->acregmax * HZ;
780 server->acdirmin = data->acdirmin * HZ;
781 server->acdirmax = data->acdirmax * HZ;
782
783 /* Start lockd here, before we might error out */
784 error = nfs_start_lockd(server);
785 if (error < 0)
786 goto error;
787
788 server->port = data->nfs_server.port;
789 server->auth_info = data->auth_info;
790
791 error = nfs_init_server_rpcclient(server, &timeparms,
792 data->selected_flavor);
793 if (error < 0)
794 goto error;
795
796 /* Preserve the values of mount_server-related mount options */
797 if (data->mount_server.addrlen) {
798 memcpy(&server->mountd_address, &data->mount_server.address,
799 data->mount_server.addrlen);
800 server->mountd_addrlen = data->mount_server.addrlen;
801 }
802 server->mountd_version = data->mount_server.version;
803 server->mountd_port = data->mount_server.port;
804 server->mountd_protocol = data->mount_server.protocol;
805
806 server->namelen = data->namlen;
807 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
808 return 0;
809
810error:
811 server->nfs_client = NULL;
812 nfs_put_client(clp);
813 dprintk("<-- nfs_init_server() = xerror %d\n", error);
814 return error;
815}
816
817/*
818 * Load up the server record from information gained in an fsinfo record
819 */
820static void nfs_server_set_fsinfo(struct nfs_server *server,
821 struct nfs_fh *mntfh,
822 struct nfs_fsinfo *fsinfo)
823{
824 unsigned long max_rpc_payload;
825
826 /* Work out a lot of parameters */
827 if (server->rsize == 0)
828 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
829 if (server->wsize == 0)
830 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
831
832 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
833 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
834 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
835 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
836
837 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
838 if (server->rsize > max_rpc_payload)
839 server->rsize = max_rpc_payload;
840 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
841 server->rsize = NFS_MAX_FILE_IO_SIZE;
842 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
843
844 server->backing_dev_info.name = "nfs";
845 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
846
847 if (server->wsize > max_rpc_payload)
848 server->wsize = max_rpc_payload;
849 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
850 server->wsize = NFS_MAX_FILE_IO_SIZE;
851 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
852
853 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
854
855 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
856 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
857 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
858 if (server->dtsize > server->rsize)
859 server->dtsize = server->rsize;
860
861 if (server->flags & NFS_MOUNT_NOAC) {
862 server->acregmin = server->acregmax = 0;
863 server->acdirmin = server->acdirmax = 0;
864 }
865
866 server->maxfilesize = fsinfo->maxfilesize;
867
868 server->time_delta = fsinfo->time_delta;
869
870 /* We're airborne Set socket buffersize */
871 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
872}
873
874/*
875 * Probe filesystem information, including the FSID on v2/v3
876 */
877int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
878{
879 struct nfs_fsinfo fsinfo;
880 struct nfs_client *clp = server->nfs_client;
881 int error;
882
883 dprintk("--> nfs_probe_fsinfo()\n");
884
885 if (clp->rpc_ops->set_capabilities != NULL) {
886 error = clp->rpc_ops->set_capabilities(server, mntfh);
887 if (error < 0)
888 goto out_error;
889 }
890
891 fsinfo.fattr = fattr;
892 fsinfo.layouttype = 0;
893 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
894 if (error < 0)
895 goto out_error;
896
897 nfs_server_set_fsinfo(server, mntfh, &fsinfo);
898
899 /* Get some general file system info */
900 if (server->namelen == 0) {
901 struct nfs_pathconf pathinfo;
902
903 pathinfo.fattr = fattr;
904 nfs_fattr_init(fattr);
905
906 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
907 server->namelen = pathinfo.max_namelen;
908 }
909
910 dprintk("<-- nfs_probe_fsinfo() = 0\n");
911 return 0;
912
913out_error:
914 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
915 return error;
916}
917EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
918
919/*
920 * Copy useful information when duplicating a server record
921 */
922void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
923{
924 target->flags = source->flags;
925 target->rsize = source->rsize;
926 target->wsize = source->wsize;
927 target->acregmin = source->acregmin;
928 target->acregmax = source->acregmax;
929 target->acdirmin = source->acdirmin;
930 target->acdirmax = source->acdirmax;
931 target->caps = source->caps;
932 target->options = source->options;
933 target->auth_info = source->auth_info;
934}
935EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
936
937void nfs_server_insert_lists(struct nfs_server *server)
938{
939 struct nfs_client *clp = server->nfs_client;
940 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
941
942 spin_lock(&nn->nfs_client_lock);
943 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
944 list_add_tail(&server->master_link, &nn->nfs_volume_list);
945 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
946 spin_unlock(&nn->nfs_client_lock);
947
948}
949EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
950
951void nfs_server_remove_lists(struct nfs_server *server)
952{
953 struct nfs_client *clp = server->nfs_client;
954 struct nfs_net *nn;
955
956 if (clp == NULL)
957 return;
958 nn = net_generic(clp->cl_net, nfs_net_id);
959 spin_lock(&nn->nfs_client_lock);
960 list_del_rcu(&server->client_link);
961 if (list_empty(&clp->cl_superblocks))
962 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
963 list_del(&server->master_link);
964 spin_unlock(&nn->nfs_client_lock);
965
966 synchronize_rcu();
967}
968EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
969
970/*
971 * Allocate and initialise a server record
972 */
973struct nfs_server *nfs_alloc_server(void)
974{
975 struct nfs_server *server;
976
977 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
978 if (!server)
979 return NULL;
980
981 server->client = server->client_acl = ERR_PTR(-EINVAL);
982
983 /* Zero out the NFS state stuff */
984 INIT_LIST_HEAD(&server->client_link);
985 INIT_LIST_HEAD(&server->master_link);
986 INIT_LIST_HEAD(&server->delegations);
987 INIT_LIST_HEAD(&server->layouts);
988 INIT_LIST_HEAD(&server->state_owners_lru);
989
990 atomic_set(&server->active, 0);
991
992 server->io_stats = nfs_alloc_iostats();
993 if (!server->io_stats) {
994 kfree(server);
995 return NULL;
996 }
997
998 if (bdi_init(&server->backing_dev_info)) {
999 nfs_free_iostats(server->io_stats);
1000 kfree(server);
1001 return NULL;
1002 }
1003
1004 ida_init(&server->openowner_id);
1005 ida_init(&server->lockowner_id);
1006 pnfs_init_server(server);
1007
1008 return server;
1009}
1010EXPORT_SYMBOL_GPL(nfs_alloc_server);
1011
1012/*
1013 * Free up a server record
1014 */
1015void nfs_free_server(struct nfs_server *server)
1016{
1017 dprintk("--> nfs_free_server()\n");
1018
1019 nfs_server_remove_lists(server);
1020
1021 if (server->destroy != NULL)
1022 server->destroy(server);
1023
1024 if (!IS_ERR(server->client_acl))
1025 rpc_shutdown_client(server->client_acl);
1026 if (!IS_ERR(server->client))
1027 rpc_shutdown_client(server->client);
1028
1029 nfs_put_client(server->nfs_client);
1030
1031 ida_destroy(&server->lockowner_id);
1032 ida_destroy(&server->openowner_id);
1033 nfs_free_iostats(server->io_stats);
1034 bdi_destroy(&server->backing_dev_info);
1035 kfree(server);
1036 nfs_release_automount_timer();
1037 dprintk("<-- nfs_free_server()\n");
1038}
1039EXPORT_SYMBOL_GPL(nfs_free_server);
1040
1041/*
1042 * Create a version 2 or 3 volume record
1043 * - keyed on server and FSID
1044 */
1045struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
1046 struct nfs_subversion *nfs_mod)
1047{
1048 struct nfs_server *server;
1049 struct nfs_fattr *fattr;
1050 int error;
1051
1052 server = nfs_alloc_server();
1053 if (!server)
1054 return ERR_PTR(-ENOMEM);
1055
1056 error = -ENOMEM;
1057 fattr = nfs_alloc_fattr();
1058 if (fattr == NULL)
1059 goto error;
1060
1061 /* Get a client representation */
1062 error = nfs_init_server(server, mount_info->parsed, nfs_mod);
1063 if (error < 0)
1064 goto error;
1065
1066 /* Probe the root fh to retrieve its FSID */
1067 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
1068 if (error < 0)
1069 goto error;
1070 if (server->nfs_client->rpc_ops->version == 3) {
1071 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1072 server->namelen = NFS3_MAXNAMLEN;
1073 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
1074 server->caps |= NFS_CAP_READDIRPLUS;
1075 } else {
1076 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1077 server->namelen = NFS2_MAXNAMLEN;
1078 }
1079
1080 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1081 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
1082 if (error < 0) {
1083 dprintk("nfs_create_server: getattr error = %d\n", -error);
1084 goto error;
1085 }
1086 }
1087 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1088
1089 dprintk("Server FSID: %llx:%llx\n",
1090 (unsigned long long) server->fsid.major,
1091 (unsigned long long) server->fsid.minor);
1092
1093 nfs_server_insert_lists(server);
1094 server->mount_time = jiffies;
1095 nfs_free_fattr(fattr);
1096 return server;
1097
1098error:
1099 nfs_free_fattr(fattr);
1100 nfs_free_server(server);
1101 return ERR_PTR(error);
1102}
1103EXPORT_SYMBOL_GPL(nfs_create_server);
1104
1105/*
1106 * Clone an NFS2, NFS3 or NFS4 server record
1107 */
1108struct nfs_server *nfs_clone_server(struct nfs_server *source,
1109 struct nfs_fh *fh,
1110 struct nfs_fattr *fattr,
1111 rpc_authflavor_t flavor)
1112{
1113 struct nfs_server *server;
1114 struct nfs_fattr *fattr_fsinfo;
1115 int error;
1116
1117 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1118 (unsigned long long) fattr->fsid.major,
1119 (unsigned long long) fattr->fsid.minor);
1120
1121 server = nfs_alloc_server();
1122 if (!server)
1123 return ERR_PTR(-ENOMEM);
1124
1125 error = -ENOMEM;
1126 fattr_fsinfo = nfs_alloc_fattr();
1127 if (fattr_fsinfo == NULL)
1128 goto out_free_server;
1129
1130 /* Copy data from the source */
1131 server->nfs_client = source->nfs_client;
1132 server->destroy = source->destroy;
1133 atomic_inc(&server->nfs_client->cl_count);
1134 nfs_server_copy_userdata(server, source);
1135
1136 server->fsid = fattr->fsid;
1137
1138 error = nfs_init_server_rpcclient(server,
1139 source->client->cl_timeout,
1140 flavor);
1141 if (error < 0)
1142 goto out_free_server;
1143
1144 /* probe the filesystem info for this server filesystem */
1145 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1146 if (error < 0)
1147 goto out_free_server;
1148
1149 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1150 server->namelen = NFS4_MAXNAMLEN;
1151
1152 dprintk("Cloned FSID: %llx:%llx\n",
1153 (unsigned long long) server->fsid.major,
1154 (unsigned long long) server->fsid.minor);
1155
1156 error = nfs_start_lockd(server);
1157 if (error < 0)
1158 goto out_free_server;
1159
1160 nfs_server_insert_lists(server);
1161 server->mount_time = jiffies;
1162
1163 nfs_free_fattr(fattr_fsinfo);
1164 dprintk("<-- nfs_clone_server() = %p\n", server);
1165 return server;
1166
1167out_free_server:
1168 nfs_free_fattr(fattr_fsinfo);
1169 nfs_free_server(server);
1170 dprintk("<-- nfs_clone_server() = error %d\n", error);
1171 return ERR_PTR(error);
1172}
1173EXPORT_SYMBOL_GPL(nfs_clone_server);
1174
1175void nfs_clients_init(struct net *net)
1176{
1177 struct nfs_net *nn = net_generic(net, nfs_net_id);
1178
1179 INIT_LIST_HEAD(&nn->nfs_client_list);
1180 INIT_LIST_HEAD(&nn->nfs_volume_list);
1181#if IS_ENABLED(CONFIG_NFS_V4)
1182 idr_init(&nn->cb_ident_idr);
1183#endif
1184 spin_lock_init(&nn->nfs_client_lock);
1185 nn->boot_time = CURRENT_TIME;
1186}
1187
1188#ifdef CONFIG_PROC_FS
1189static struct proc_dir_entry *proc_fs_nfs;
1190
1191static int nfs_server_list_open(struct inode *inode, struct file *file);
1192static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1193static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1194static void nfs_server_list_stop(struct seq_file *p, void *v);
1195static int nfs_server_list_show(struct seq_file *m, void *v);
1196
1197static const struct seq_operations nfs_server_list_ops = {
1198 .start = nfs_server_list_start,
1199 .next = nfs_server_list_next,
1200 .stop = nfs_server_list_stop,
1201 .show = nfs_server_list_show,
1202};
1203
1204static const struct file_operations nfs_server_list_fops = {
1205 .open = nfs_server_list_open,
1206 .read = seq_read,
1207 .llseek = seq_lseek,
1208 .release = seq_release,
1209 .owner = THIS_MODULE,
1210};
1211
1212static int nfs_volume_list_open(struct inode *inode, struct file *file);
1213static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1214static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1215static void nfs_volume_list_stop(struct seq_file *p, void *v);
1216static int nfs_volume_list_show(struct seq_file *m, void *v);
1217
1218static const struct seq_operations nfs_volume_list_ops = {
1219 .start = nfs_volume_list_start,
1220 .next = nfs_volume_list_next,
1221 .stop = nfs_volume_list_stop,
1222 .show = nfs_volume_list_show,
1223};
1224
1225static const struct file_operations nfs_volume_list_fops = {
1226 .open = nfs_volume_list_open,
1227 .read = seq_read,
1228 .llseek = seq_lseek,
1229 .release = seq_release,
1230 .owner = THIS_MODULE,
1231};
1232
1233/*
1234 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1235 * we're dealing
1236 */
1237static int nfs_server_list_open(struct inode *inode, struct file *file)
1238{
1239 struct seq_file *m;
1240 int ret;
1241 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1242 struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1243
1244 ret = seq_open(file, &nfs_server_list_ops);
1245 if (ret < 0)
1246 return ret;
1247
1248 m = file->private_data;
1249 m->private = net;
1250
1251 return 0;
1252}
1253
1254/*
1255 * set up the iterator to start reading from the server list and return the first item
1256 */
1257static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1258{
1259 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1260
1261 /* lock the list against modification */
1262 spin_lock(&nn->nfs_client_lock);
1263 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1264}
1265
1266/*
1267 * move to next server
1268 */
1269static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1270{
1271 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1272
1273 return seq_list_next(v, &nn->nfs_client_list, pos);
1274}
1275
1276/*
1277 * clean up after reading from the transports list
1278 */
1279static void nfs_server_list_stop(struct seq_file *p, void *v)
1280{
1281 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1282
1283 spin_unlock(&nn->nfs_client_lock);
1284}
1285
1286/*
1287 * display a header line followed by a load of call lines
1288 */
1289static int nfs_server_list_show(struct seq_file *m, void *v)
1290{
1291 struct nfs_client *clp;
1292 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1293
1294 /* display header on line 1 */
1295 if (v == &nn->nfs_client_list) {
1296 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1297 return 0;
1298 }
1299
1300 /* display one transport per line on subsequent lines */
1301 clp = list_entry(v, struct nfs_client, cl_share_link);
1302
1303 /* Check if the client is initialized */
1304 if (clp->cl_cons_state != NFS_CS_READY)
1305 return 0;
1306
1307 rcu_read_lock();
1308 seq_printf(m, "v%u %s %s %3d %s\n",
1309 clp->rpc_ops->version,
1310 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1311 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1312 atomic_read(&clp->cl_count),
1313 clp->cl_hostname);
1314 rcu_read_unlock();
1315
1316 return 0;
1317}
1318
1319/*
1320 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1321 */
1322static int nfs_volume_list_open(struct inode *inode, struct file *file)
1323{
1324 struct seq_file *m;
1325 int ret;
1326 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1327 struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1328
1329 ret = seq_open(file, &nfs_volume_list_ops);
1330 if (ret < 0)
1331 return ret;
1332
1333 m = file->private_data;
1334 m->private = net;
1335
1336 return 0;
1337}
1338
1339/*
1340 * set up the iterator to start reading from the volume list and return the first item
1341 */
1342static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1343{
1344 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1345
1346 /* lock the list against modification */
1347 spin_lock(&nn->nfs_client_lock);
1348 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1349}
1350
1351/*
1352 * move to next volume
1353 */
1354static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1355{
1356 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1357
1358 return seq_list_next(v, &nn->nfs_volume_list, pos);
1359}
1360
1361/*
1362 * clean up after reading from the transports list
1363 */
1364static void nfs_volume_list_stop(struct seq_file *p, void *v)
1365{
1366 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1367
1368 spin_unlock(&nn->nfs_client_lock);
1369}
1370
1371/*
1372 * display a header line followed by a load of call lines
1373 */
1374static int nfs_volume_list_show(struct seq_file *m, void *v)
1375{
1376 struct nfs_server *server;
1377 struct nfs_client *clp;
1378 char dev[8], fsid[17];
1379 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1380
1381 /* display header on line 1 */
1382 if (v == &nn->nfs_volume_list) {
1383 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
1384 return 0;
1385 }
1386 /* display one transport per line on subsequent lines */
1387 server = list_entry(v, struct nfs_server, master_link);
1388 clp = server->nfs_client;
1389
1390 snprintf(dev, 8, "%u:%u",
1391 MAJOR(server->s_dev), MINOR(server->s_dev));
1392
1393 snprintf(fsid, 17, "%llx:%llx",
1394 (unsigned long long) server->fsid.major,
1395 (unsigned long long) server->fsid.minor);
1396
1397 rcu_read_lock();
1398 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1399 clp->rpc_ops->version,
1400 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1401 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1402 dev,
1403 fsid,
1404 nfs_server_fscache_state(server));
1405 rcu_read_unlock();
1406
1407 return 0;
1408}
1409
1410/*
1411 * initialise the /proc/fs/nfsfs/ directory
1412 */
1413int __init nfs_fs_proc_init(void)
1414{
1415 struct proc_dir_entry *p;
1416
1417 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1418 if (!proc_fs_nfs)
1419 goto error_0;
1420
1421 /* a file of servers with which we're dealing */
1422 p = proc_create("servers", S_IFREG|S_IRUGO,
1423 proc_fs_nfs, &nfs_server_list_fops);
1424 if (!p)
1425 goto error_1;
1426
1427 /* a file of volumes that we have mounted */
1428 p = proc_create("volumes", S_IFREG|S_IRUGO,
1429 proc_fs_nfs, &nfs_volume_list_fops);
1430 if (!p)
1431 goto error_2;
1432 return 0;
1433
1434error_2:
1435 remove_proc_entry("servers", proc_fs_nfs);
1436error_1:
1437 remove_proc_entry("fs/nfsfs", NULL);
1438error_0:
1439 return -ENOMEM;
1440}
1441
1442/*
1443 * clean up the /proc/fs/nfsfs/ directory
1444 */
1445void nfs_fs_proc_exit(void)
1446{
1447 remove_proc_entry("volumes", proc_fs_nfs);
1448 remove_proc_entry("servers", proc_fs_nfs);
1449 remove_proc_entry("fs/nfsfs", NULL);
1450}
1451
1452#endif /* CONFIG_PROC_FS */