Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* client.c: NFS client sharing and management code
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/sched.h>
12#include <linux/time.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/string.h>
16#include <linux/stat.h>
17#include <linux/errno.h>
18#include <linux/unistd.h>
19#include <linux/sunrpc/addr.h>
20#include <linux/sunrpc/clnt.h>
21#include <linux/sunrpc/stats.h>
22#include <linux/sunrpc/metrics.h>
23#include <linux/sunrpc/xprtsock.h>
24#include <linux/sunrpc/xprtrdma.h>
25#include <linux/nfs_fs.h>
26#include <linux/nfs_mount.h>
27#include <linux/nfs4_mount.h>
28#include <linux/lockd/bind.h>
29#include <linux/seq_file.h>
30#include <linux/mount.h>
31#include <linux/vfs.h>
32#include <linux/inet.h>
33#include <linux/in6.h>
34#include <linux/slab.h>
35#include <linux/idr.h>
36#include <net/ipv6.h>
37#include <linux/nfs_xdr.h>
38#include <linux/sunrpc/bc_xprt.h>
39#include <linux/nsproxy.h>
40#include <linux/pid_namespace.h>
41
42
43#include "nfs4_fs.h"
44#include "callback.h"
45#include "delegation.h"
46#include "iostat.h"
47#include "internal.h"
48#include "fscache.h"
49#include "pnfs.h"
50#include "nfs.h"
51#include "netns.h"
52#include "sysfs.h"
53#include "nfs42.h"
54
55#define NFSDBG_FACILITY NFSDBG_CLIENT
56
57static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
58static DEFINE_SPINLOCK(nfs_version_lock);
59static DEFINE_MUTEX(nfs_version_mutex);
60static LIST_HEAD(nfs_versions);
61
62/*
63 * RPC cruft for NFS
64 */
65static const struct rpc_version *nfs_version[5] = {
66 [2] = NULL,
67 [3] = NULL,
68 [4] = NULL,
69};
70
71const struct rpc_program nfs_program = {
72 .name = "nfs",
73 .number = NFS_PROGRAM,
74 .nrvers = ARRAY_SIZE(nfs_version),
75 .version = nfs_version,
76 .stats = &nfs_rpcstat,
77 .pipe_dir_name = NFS_PIPE_DIRNAME,
78};
79
80struct rpc_stat nfs_rpcstat = {
81 .program = &nfs_program
82};
83
84static struct nfs_subversion *find_nfs_version(unsigned int version)
85{
86 struct nfs_subversion *nfs;
87 spin_lock(&nfs_version_lock);
88
89 list_for_each_entry(nfs, &nfs_versions, list) {
90 if (nfs->rpc_ops->version == version) {
91 spin_unlock(&nfs_version_lock);
92 return nfs;
93 }
94 }
95
96 spin_unlock(&nfs_version_lock);
97 return ERR_PTR(-EPROTONOSUPPORT);
98}
99
100struct nfs_subversion *get_nfs_version(unsigned int version)
101{
102 struct nfs_subversion *nfs = find_nfs_version(version);
103
104 if (IS_ERR(nfs)) {
105 mutex_lock(&nfs_version_mutex);
106 request_module("nfsv%d", version);
107 nfs = find_nfs_version(version);
108 mutex_unlock(&nfs_version_mutex);
109 }
110
111 if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
112 return ERR_PTR(-EAGAIN);
113 return nfs;
114}
115
116void put_nfs_version(struct nfs_subversion *nfs)
117{
118 module_put(nfs->owner);
119}
120
121void register_nfs_version(struct nfs_subversion *nfs)
122{
123 spin_lock(&nfs_version_lock);
124
125 list_add(&nfs->list, &nfs_versions);
126 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
127
128 spin_unlock(&nfs_version_lock);
129}
130EXPORT_SYMBOL_GPL(register_nfs_version);
131
132void unregister_nfs_version(struct nfs_subversion *nfs)
133{
134 spin_lock(&nfs_version_lock);
135
136 nfs_version[nfs->rpc_ops->version] = NULL;
137 list_del(&nfs->list);
138
139 spin_unlock(&nfs_version_lock);
140}
141EXPORT_SYMBOL_GPL(unregister_nfs_version);
142
143/*
144 * Allocate a shared client record
145 *
146 * Since these are allocated/deallocated very rarely, we don't
147 * bother putting them in a slab cache...
148 */
149struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
150{
151 struct nfs_client *clp;
152 int err = -ENOMEM;
153
154 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
155 goto error_0;
156
157 clp->cl_minorversion = cl_init->minorversion;
158 clp->cl_nfs_mod = cl_init->nfs_mod;
159 if (!try_module_get(clp->cl_nfs_mod->owner))
160 goto error_dealloc;
161
162 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
163
164 refcount_set(&clp->cl_count, 1);
165 clp->cl_cons_state = NFS_CS_INITING;
166
167 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
168 clp->cl_addrlen = cl_init->addrlen;
169
170 if (cl_init->hostname) {
171 err = -ENOMEM;
172 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
173 if (!clp->cl_hostname)
174 goto error_cleanup;
175 }
176
177 INIT_LIST_HEAD(&clp->cl_superblocks);
178 clp->cl_rpcclient = ERR_PTR(-EINVAL);
179
180 clp->cl_flags = cl_init->init_flags;
181 clp->cl_proto = cl_init->proto;
182 clp->cl_nconnect = cl_init->nconnect;
183 clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1;
184 clp->cl_net = get_net(cl_init->net);
185
186 clp->cl_principal = "*";
187 clp->cl_xprtsec = cl_init->xprtsec;
188 return clp;
189
190error_cleanup:
191 put_nfs_version(clp->cl_nfs_mod);
192error_dealloc:
193 kfree(clp);
194error_0:
195 return ERR_PTR(err);
196}
197EXPORT_SYMBOL_GPL(nfs_alloc_client);
198
199#if IS_ENABLED(CONFIG_NFS_V4)
200static void nfs_cleanup_cb_ident_idr(struct net *net)
201{
202 struct nfs_net *nn = net_generic(net, nfs_net_id);
203
204 idr_destroy(&nn->cb_ident_idr);
205}
206
207/* nfs_client_lock held */
208static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
209{
210 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
211
212 if (clp->cl_cb_ident)
213 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
214}
215
216static void pnfs_init_server(struct nfs_server *server)
217{
218 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
219}
220
221#else
222static void nfs_cleanup_cb_ident_idr(struct net *net)
223{
224}
225
226static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
227{
228}
229
230static void pnfs_init_server(struct nfs_server *server)
231{
232}
233
234#endif /* CONFIG_NFS_V4 */
235
236/*
237 * Destroy a shared client record
238 */
239void nfs_free_client(struct nfs_client *clp)
240{
241 /* -EIO all pending I/O */
242 if (!IS_ERR(clp->cl_rpcclient))
243 rpc_shutdown_client(clp->cl_rpcclient);
244
245 put_net(clp->cl_net);
246 put_nfs_version(clp->cl_nfs_mod);
247 kfree(clp->cl_hostname);
248 kfree(clp->cl_acceptor);
249 kfree_rcu(clp, rcu);
250}
251EXPORT_SYMBOL_GPL(nfs_free_client);
252
253/*
254 * Release a reference to a shared client record
255 */
256void nfs_put_client(struct nfs_client *clp)
257{
258 struct nfs_net *nn;
259
260 if (!clp)
261 return;
262
263 nn = net_generic(clp->cl_net, nfs_net_id);
264
265 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
266 list_del(&clp->cl_share_link);
267 nfs_cb_idr_remove_locked(clp);
268 spin_unlock(&nn->nfs_client_lock);
269
270 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
271
272 clp->rpc_ops->free_client(clp);
273 }
274}
275EXPORT_SYMBOL_GPL(nfs_put_client);
276
277/*
278 * Find an nfs_client on the list that matches the initialisation data
279 * that is supplied.
280 */
281static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
282{
283 struct nfs_client *clp;
284 const struct sockaddr *sap = (struct sockaddr *)data->addr;
285 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
286 int error;
287
288again:
289 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
290 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
291 /* Don't match clients that failed to initialise properly */
292 if (clp->cl_cons_state < 0)
293 continue;
294
295 /* If a client is still initializing then we need to wait */
296 if (clp->cl_cons_state > NFS_CS_READY) {
297 refcount_inc(&clp->cl_count);
298 spin_unlock(&nn->nfs_client_lock);
299 error = nfs_wait_client_init_complete(clp);
300 nfs_put_client(clp);
301 spin_lock(&nn->nfs_client_lock);
302 if (error < 0)
303 return ERR_PTR(error);
304 goto again;
305 }
306
307 /* Different NFS versions cannot share the same nfs_client */
308 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
309 continue;
310
311 if (clp->cl_proto != data->proto)
312 continue;
313 /* Match nfsv4 minorversion */
314 if (clp->cl_minorversion != data->minorversion)
315 continue;
316
317 /* Match request for a dedicated DS */
318 if (test_bit(NFS_CS_DS, &data->init_flags) !=
319 test_bit(NFS_CS_DS, &clp->cl_flags))
320 continue;
321
322 /* Match the full socket address */
323 if (!rpc_cmp_addr_port(sap, clap))
324 /* Match all xprt_switch full socket addresses */
325 if (IS_ERR(clp->cl_rpcclient) ||
326 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
327 sap))
328 continue;
329
330 /* Match the xprt security policy */
331 if (clp->cl_xprtsec.policy != data->xprtsec.policy)
332 continue;
333
334 refcount_inc(&clp->cl_count);
335 return clp;
336 }
337 return NULL;
338}
339
340/*
341 * Return true if @clp is done initializing, false if still working on it.
342 *
343 * Use nfs_client_init_status to check if it was successful.
344 */
345bool nfs_client_init_is_complete(const struct nfs_client *clp)
346{
347 return clp->cl_cons_state <= NFS_CS_READY;
348}
349EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
350
351/*
352 * Return 0 if @clp was successfully initialized, -errno otherwise.
353 *
354 * This must be called *after* nfs_client_init_is_complete() returns true,
355 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
356 */
357int nfs_client_init_status(const struct nfs_client *clp)
358{
359 /* called without checking nfs_client_init_is_complete */
360 if (clp->cl_cons_state > NFS_CS_READY) {
361 WARN_ON_ONCE(1);
362 return -EINVAL;
363 }
364 return clp->cl_cons_state;
365}
366EXPORT_SYMBOL_GPL(nfs_client_init_status);
367
368int nfs_wait_client_init_complete(const struct nfs_client *clp)
369{
370 return wait_event_killable(nfs_client_active_wq,
371 nfs_client_init_is_complete(clp));
372}
373EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
374
375/*
376 * Found an existing client. Make sure it's ready before returning.
377 */
378static struct nfs_client *
379nfs_found_client(const struct nfs_client_initdata *cl_init,
380 struct nfs_client *clp)
381{
382 int error;
383
384 error = nfs_wait_client_init_complete(clp);
385 if (error < 0) {
386 nfs_put_client(clp);
387 return ERR_PTR(-ERESTARTSYS);
388 }
389
390 if (clp->cl_cons_state < NFS_CS_READY) {
391 error = clp->cl_cons_state;
392 nfs_put_client(clp);
393 return ERR_PTR(error);
394 }
395
396 smp_rmb();
397 return clp;
398}
399
400/*
401 * Look up a client by IP address and protocol version
402 * - creates a new record if one doesn't yet exist
403 */
404struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
405{
406 struct nfs_client *clp, *new = NULL;
407 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
408 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
409
410 if (cl_init->hostname == NULL) {
411 WARN_ON(1);
412 return ERR_PTR(-EINVAL);
413 }
414
415 /* see if the client already exists */
416 do {
417 spin_lock(&nn->nfs_client_lock);
418
419 clp = nfs_match_client(cl_init);
420 if (clp) {
421 spin_unlock(&nn->nfs_client_lock);
422 if (new)
423 new->rpc_ops->free_client(new);
424 if (IS_ERR(clp))
425 return clp;
426 return nfs_found_client(cl_init, clp);
427 }
428 if (new) {
429 list_add_tail(&new->cl_share_link,
430 &nn->nfs_client_list);
431 spin_unlock(&nn->nfs_client_lock);
432 return rpc_ops->init_client(new, cl_init);
433 }
434
435 spin_unlock(&nn->nfs_client_lock);
436
437 new = rpc_ops->alloc_client(cl_init);
438 } while (!IS_ERR(new));
439
440 return new;
441}
442EXPORT_SYMBOL_GPL(nfs_get_client);
443
444/*
445 * Mark a server as ready or failed
446 */
447void nfs_mark_client_ready(struct nfs_client *clp, int state)
448{
449 smp_wmb();
450 clp->cl_cons_state = state;
451 wake_up_all(&nfs_client_active_wq);
452}
453EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
454
455/*
456 * Initialise the timeout values for a connection
457 */
458void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
459 int timeo, int retrans)
460{
461 to->to_initval = timeo * HZ / 10;
462 to->to_retries = retrans;
463
464 switch (proto) {
465 case XPRT_TRANSPORT_TCP:
466 case XPRT_TRANSPORT_TCP_TLS:
467 case XPRT_TRANSPORT_RDMA:
468 if (retrans == NFS_UNSPEC_RETRANS)
469 to->to_retries = NFS_DEF_TCP_RETRANS;
470 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
471 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
472 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
473 to->to_initval = NFS_MAX_TCP_TIMEOUT;
474 to->to_increment = to->to_initval;
475 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
476 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
477 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
478 if (to->to_maxval < to->to_initval)
479 to->to_maxval = to->to_initval;
480 to->to_exponential = 0;
481 break;
482 case XPRT_TRANSPORT_UDP:
483 if (retrans == NFS_UNSPEC_RETRANS)
484 to->to_retries = NFS_DEF_UDP_RETRANS;
485 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
486 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
487 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
488 to->to_initval = NFS_MAX_UDP_TIMEOUT;
489 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
490 to->to_exponential = 1;
491 break;
492 default:
493 BUG();
494 }
495}
496EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
497
498/*
499 * Create an RPC client handle
500 */
501int nfs_create_rpc_client(struct nfs_client *clp,
502 const struct nfs_client_initdata *cl_init,
503 rpc_authflavor_t flavor)
504{
505 struct rpc_clnt *clnt = NULL;
506 struct rpc_create_args args = {
507 .net = clp->cl_net,
508 .protocol = clp->cl_proto,
509 .nconnect = clp->cl_nconnect,
510 .address = (struct sockaddr *)&clp->cl_addr,
511 .addrsize = clp->cl_addrlen,
512 .timeout = cl_init->timeparms,
513 .servername = clp->cl_hostname,
514 .nodename = cl_init->nodename,
515 .program = &nfs_program,
516 .version = clp->rpc_ops->version,
517 .authflavor = flavor,
518 .cred = cl_init->cred,
519 .xprtsec = cl_init->xprtsec,
520 .connect_timeout = cl_init->connect_timeout,
521 .reconnect_timeout = cl_init->reconnect_timeout,
522 };
523
524 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
525 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
526 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
527 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
528 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
529 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
530 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
531 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
532 if (test_bit(NFS_CS_NOPING, &clp->cl_flags))
533 args.flags |= RPC_CLNT_CREATE_NOPING;
534 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags))
535 args.flags |= RPC_CLNT_CREATE_REUSEPORT;
536
537 if (!IS_ERR(clp->cl_rpcclient))
538 return 0;
539
540 clnt = rpc_create(&args);
541 if (IS_ERR(clnt)) {
542 dprintk("%s: cannot create RPC client. Error = %ld\n",
543 __func__, PTR_ERR(clnt));
544 return PTR_ERR(clnt);
545 }
546
547 clnt->cl_principal = clp->cl_principal;
548 clp->cl_rpcclient = clnt;
549 clnt->cl_max_connect = clp->cl_max_connect;
550 return 0;
551}
552EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
553
554/*
555 * Version 2 or 3 client destruction
556 */
557static void nfs_destroy_server(struct nfs_server *server)
558{
559 if (server->nlm_host)
560 nlmclnt_done(server->nlm_host);
561}
562
563/*
564 * Version 2 or 3 lockd setup
565 */
566static int nfs_start_lockd(struct nfs_server *server)
567{
568 struct nlm_host *host;
569 struct nfs_client *clp = server->nfs_client;
570 struct nlmclnt_initdata nlm_init = {
571 .hostname = clp->cl_hostname,
572 .address = (struct sockaddr *)&clp->cl_addr,
573 .addrlen = clp->cl_addrlen,
574 .nfs_version = clp->rpc_ops->version,
575 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
576 1 : 0,
577 .net = clp->cl_net,
578 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
579 .cred = server->cred,
580 };
581
582 if (nlm_init.nfs_version > 3)
583 return 0;
584 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
585 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
586 return 0;
587
588 switch (clp->cl_proto) {
589 default:
590 nlm_init.protocol = IPPROTO_TCP;
591 break;
592#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
593 case XPRT_TRANSPORT_UDP:
594 nlm_init.protocol = IPPROTO_UDP;
595#endif
596 }
597
598 host = nlmclnt_init(&nlm_init);
599 if (IS_ERR(host))
600 return PTR_ERR(host);
601
602 server->nlm_host = host;
603 server->destroy = nfs_destroy_server;
604 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL);
605 return 0;
606}
607
608/*
609 * Create a general RPC client
610 */
611int nfs_init_server_rpcclient(struct nfs_server *server,
612 const struct rpc_timeout *timeo,
613 rpc_authflavor_t pseudoflavour)
614{
615 struct nfs_client *clp = server->nfs_client;
616
617 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
618 pseudoflavour);
619 if (IS_ERR(server->client)) {
620 dprintk("%s: couldn't create rpc_client!\n", __func__);
621 return PTR_ERR(server->client);
622 }
623
624 memcpy(&server->client->cl_timeout_default,
625 timeo,
626 sizeof(server->client->cl_timeout_default));
627 server->client->cl_timeout = &server->client->cl_timeout_default;
628 server->client->cl_softrtry = 0;
629 if (server->flags & NFS_MOUNT_SOFTERR)
630 server->client->cl_softerr = 1;
631 if (server->flags & NFS_MOUNT_SOFT)
632 server->client->cl_softrtry = 1;
633
634 nfs_sysfs_link_rpc_client(server, server->client, NULL);
635 return 0;
636}
637EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
638
639/**
640 * nfs_init_client - Initialise an NFS2 or NFS3 client
641 *
642 * @clp: nfs_client to initialise
643 * @cl_init: Initialisation parameters
644 *
645 * Returns pointer to an NFS client, or an ERR_PTR value.
646 */
647struct nfs_client *nfs_init_client(struct nfs_client *clp,
648 const struct nfs_client_initdata *cl_init)
649{
650 int error;
651
652 /* the client is already initialised */
653 if (clp->cl_cons_state == NFS_CS_READY)
654 return clp;
655
656 /*
657 * Create a client RPC handle for doing FSSTAT with UNIX auth only
658 * - RFC 2623, sec 2.3.2
659 */
660 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
661 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
662 if (error < 0) {
663 nfs_put_client(clp);
664 clp = ERR_PTR(error);
665 }
666 return clp;
667}
668EXPORT_SYMBOL_GPL(nfs_init_client);
669
670/*
671 * Create a version 2 or 3 client
672 */
673static int nfs_init_server(struct nfs_server *server,
674 const struct fs_context *fc)
675{
676 const struct nfs_fs_context *ctx = nfs_fc2context(fc);
677 struct rpc_timeout timeparms;
678 struct nfs_client_initdata cl_init = {
679 .hostname = ctx->nfs_server.hostname,
680 .addr = &ctx->nfs_server._address,
681 .addrlen = ctx->nfs_server.addrlen,
682 .nfs_mod = ctx->nfs_mod,
683 .proto = ctx->nfs_server.protocol,
684 .net = fc->net_ns,
685 .timeparms = &timeparms,
686 .cred = server->cred,
687 .nconnect = ctx->nfs_server.nconnect,
688 .init_flags = (1UL << NFS_CS_REUSEPORT),
689 .xprtsec = ctx->xprtsec,
690 };
691 struct nfs_client *clp;
692 int error;
693
694 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
695 ctx->timeo, ctx->retrans);
696 if (ctx->flags & NFS_MOUNT_NORESVPORT)
697 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
698
699 /* Allocate or find a client reference we can use */
700 clp = nfs_get_client(&cl_init);
701 if (IS_ERR(clp))
702 return PTR_ERR(clp);
703
704 server->nfs_client = clp;
705 nfs_sysfs_add_server(server);
706 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state");
707
708 /* Initialise the client representation from the mount data */
709 server->flags = ctx->flags;
710 server->options = ctx->options;
711 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS;
712
713 switch (clp->rpc_ops->version) {
714 case 2:
715 server->fattr_valid = NFS_ATTR_FATTR_V2;
716 break;
717 case 3:
718 server->fattr_valid = NFS_ATTR_FATTR_V3;
719 break;
720 default:
721 server->fattr_valid = NFS_ATTR_FATTR_V4;
722 }
723
724 if (ctx->rsize)
725 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto);
726 if (ctx->wsize)
727 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto);
728
729 server->acregmin = ctx->acregmin * HZ;
730 server->acregmax = ctx->acregmax * HZ;
731 server->acdirmin = ctx->acdirmin * HZ;
732 server->acdirmax = ctx->acdirmax * HZ;
733
734 /* Start lockd here, before we might error out */
735 error = nfs_start_lockd(server);
736 if (error < 0)
737 goto error;
738
739 server->port = ctx->nfs_server.port;
740 server->auth_info = ctx->auth_info;
741
742 error = nfs_init_server_rpcclient(server, &timeparms,
743 ctx->selected_flavor);
744 if (error < 0)
745 goto error;
746
747 /* Preserve the values of mount_server-related mount options */
748 if (ctx->mount_server.addrlen) {
749 memcpy(&server->mountd_address, &ctx->mount_server.address,
750 ctx->mount_server.addrlen);
751 server->mountd_addrlen = ctx->mount_server.addrlen;
752 }
753 server->mountd_version = ctx->mount_server.version;
754 server->mountd_port = ctx->mount_server.port;
755 server->mountd_protocol = ctx->mount_server.protocol;
756
757 server->namelen = ctx->namlen;
758 return 0;
759
760error:
761 server->nfs_client = NULL;
762 nfs_put_client(clp);
763 return error;
764}
765
766/*
767 * Load up the server record from information gained in an fsinfo record
768 */
769static void nfs_server_set_fsinfo(struct nfs_server *server,
770 struct nfs_fsinfo *fsinfo)
771{
772 struct nfs_client *clp = server->nfs_client;
773 unsigned long max_rpc_payload, raw_max_rpc_payload;
774
775 /* Work out a lot of parameters */
776 if (server->rsize == 0)
777 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto);
778 if (server->wsize == 0)
779 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto);
780
781 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
782 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto);
783 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
784 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto);
785
786 raw_max_rpc_payload = rpc_max_payload(server->client);
787 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL);
788
789 if (server->rsize > max_rpc_payload)
790 server->rsize = max_rpc_payload;
791 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
792 server->rsize = NFS_MAX_FILE_IO_SIZE;
793 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
794
795 if (server->wsize > max_rpc_payload)
796 server->wsize = max_rpc_payload;
797 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
798 server->wsize = NFS_MAX_FILE_IO_SIZE;
799 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
800
801 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
802
803 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
804 if (server->dtsize > NFS_MAX_FILE_IO_SIZE)
805 server->dtsize = NFS_MAX_FILE_IO_SIZE;
806 if (server->dtsize > server->rsize)
807 server->dtsize = server->rsize;
808
809 if (server->flags & NFS_MOUNT_NOAC) {
810 server->acregmin = server->acregmax = 0;
811 server->acdirmin = server->acdirmax = 0;
812 }
813
814 server->maxfilesize = fsinfo->maxfilesize;
815
816 server->time_delta = fsinfo->time_delta;
817 server->change_attr_type = fsinfo->change_attr_type;
818
819 server->clone_blksize = fsinfo->clone_blksize;
820 /* We're airborne Set socket buffersize */
821 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
822
823#ifdef CONFIG_NFS_V4_2
824 /*
825 * Defaults until limited by the session parameters.
826 */
827 server->gxasize = min_t(unsigned int, raw_max_rpc_payload,
828 XATTR_SIZE_MAX);
829 server->sxasize = min_t(unsigned int, raw_max_rpc_payload,
830 XATTR_SIZE_MAX);
831 server->lxasize = min_t(unsigned int, raw_max_rpc_payload,
832 nfs42_listxattr_xdrsize(XATTR_LIST_MAX));
833
834 if (fsinfo->xattr_support)
835 server->caps |= NFS_CAP_XATTR;
836#endif
837}
838
839/*
840 * Probe filesystem information, including the FSID on v2/v3
841 */
842static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
843{
844 struct nfs_fsinfo fsinfo;
845 struct nfs_client *clp = server->nfs_client;
846 int error;
847
848 if (clp->rpc_ops->set_capabilities != NULL) {
849 error = clp->rpc_ops->set_capabilities(server, mntfh);
850 if (error < 0)
851 return error;
852 }
853
854 fsinfo.fattr = fattr;
855 fsinfo.nlayouttypes = 0;
856 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
857 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
858 if (error < 0)
859 return error;
860
861 nfs_server_set_fsinfo(server, &fsinfo);
862
863 /* Get some general file system info */
864 if (server->namelen == 0) {
865 struct nfs_pathconf pathinfo;
866
867 pathinfo.fattr = fattr;
868 nfs_fattr_init(fattr);
869
870 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
871 server->namelen = pathinfo.max_namelen;
872 }
873
874 if (clp->rpc_ops->discover_trunking != NULL &&
875 (server->caps & NFS_CAP_FS_LOCATIONS &&
876 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) {
877 error = clp->rpc_ops->discover_trunking(server, mntfh);
878 if (error < 0)
879 return error;
880 }
881
882 return 0;
883}
884
885/*
886 * Grab the destination's particulars, including lease expiry time.
887 *
888 * Returns zero if probe succeeded and retrieved FSID matches the FSID
889 * we have cached.
890 */
891int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh)
892{
893 struct nfs_fattr *fattr;
894 int error;
895
896 fattr = nfs_alloc_fattr();
897 if (fattr == NULL)
898 return -ENOMEM;
899
900 /* Sanity: the probe won't work if the destination server
901 * does not recognize the migrated FH. */
902 error = nfs_probe_fsinfo(server, mntfh, fattr);
903
904 nfs_free_fattr(fattr);
905 return error;
906}
907EXPORT_SYMBOL_GPL(nfs_probe_server);
908
909/*
910 * Copy useful information when duplicating a server record
911 */
912void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
913{
914 target->flags = source->flags;
915 target->rsize = source->rsize;
916 target->wsize = source->wsize;
917 target->acregmin = source->acregmin;
918 target->acregmax = source->acregmax;
919 target->acdirmin = source->acdirmin;
920 target->acdirmax = source->acdirmax;
921 target->caps = source->caps;
922 target->options = source->options;
923 target->auth_info = source->auth_info;
924 target->port = source->port;
925}
926EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
927
928void nfs_server_insert_lists(struct nfs_server *server)
929{
930 struct nfs_client *clp = server->nfs_client;
931 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
932
933 spin_lock(&nn->nfs_client_lock);
934 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
935 list_add_tail(&server->master_link, &nn->nfs_volume_list);
936 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
937 spin_unlock(&nn->nfs_client_lock);
938
939}
940EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
941
942void nfs_server_remove_lists(struct nfs_server *server)
943{
944 struct nfs_client *clp = server->nfs_client;
945 struct nfs_net *nn;
946
947 if (clp == NULL)
948 return;
949 nn = net_generic(clp->cl_net, nfs_net_id);
950 spin_lock(&nn->nfs_client_lock);
951 list_del_rcu(&server->client_link);
952 if (list_empty(&clp->cl_superblocks))
953 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
954 list_del(&server->master_link);
955 spin_unlock(&nn->nfs_client_lock);
956
957 synchronize_rcu();
958}
959EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
960
961static DEFINE_IDA(s_sysfs_ids);
962
963/*
964 * Allocate and initialise a server record
965 */
966struct nfs_server *nfs_alloc_server(void)
967{
968 struct nfs_server *server;
969
970 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
971 if (!server)
972 return NULL;
973
974 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL);
975 if (server->s_sysfs_id < 0) {
976 kfree(server);
977 return NULL;
978 }
979
980 server->client = server->client_acl = ERR_PTR(-EINVAL);
981
982 /* Zero out the NFS state stuff */
983 INIT_LIST_HEAD(&server->client_link);
984 INIT_LIST_HEAD(&server->master_link);
985 INIT_LIST_HEAD(&server->delegations);
986 INIT_LIST_HEAD(&server->layouts);
987 INIT_LIST_HEAD(&server->state_owners_lru);
988 INIT_LIST_HEAD(&server->ss_copies);
989
990 atomic_set(&server->active, 0);
991
992 server->io_stats = nfs_alloc_iostats();
993 if (!server->io_stats) {
994 kfree(server);
995 return NULL;
996 }
997
998 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
999
1000 ida_init(&server->openowner_id);
1001 ida_init(&server->lockowner_id);
1002 pnfs_init_server(server);
1003 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
1004
1005 return server;
1006}
1007EXPORT_SYMBOL_GPL(nfs_alloc_server);
1008
1009static void delayed_free(struct rcu_head *p)
1010{
1011 struct nfs_server *server = container_of(p, struct nfs_server, rcu);
1012
1013 nfs_free_iostats(server->io_stats);
1014 kfree(server);
1015}
1016
1017/*
1018 * Free up a server record
1019 */
1020void nfs_free_server(struct nfs_server *server)
1021{
1022 nfs_server_remove_lists(server);
1023
1024 if (server->destroy != NULL)
1025 server->destroy(server);
1026
1027 if (!IS_ERR(server->client_acl))
1028 rpc_shutdown_client(server->client_acl);
1029 if (!IS_ERR(server->client))
1030 rpc_shutdown_client(server->client);
1031
1032 nfs_put_client(server->nfs_client);
1033
1034 if (server->kobj.state_initialized) {
1035 nfs_sysfs_remove_server(server);
1036 kobject_put(&server->kobj);
1037 }
1038 ida_free(&s_sysfs_ids, server->s_sysfs_id);
1039
1040 ida_destroy(&server->lockowner_id);
1041 ida_destroy(&server->openowner_id);
1042 put_cred(server->cred);
1043 nfs_release_automount_timer();
1044 call_rcu(&server->rcu, delayed_free);
1045}
1046EXPORT_SYMBOL_GPL(nfs_free_server);
1047
1048/*
1049 * Create a version 2 or 3 volume record
1050 * - keyed on server and FSID
1051 */
1052struct nfs_server *nfs_create_server(struct fs_context *fc)
1053{
1054 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1055 struct nfs_server *server;
1056 struct nfs_fattr *fattr;
1057 int error;
1058
1059 server = nfs_alloc_server();
1060 if (!server)
1061 return ERR_PTR(-ENOMEM);
1062
1063 server->cred = get_cred(fc->cred);
1064
1065 error = -ENOMEM;
1066 fattr = nfs_alloc_fattr();
1067 if (fattr == NULL)
1068 goto error;
1069
1070 /* Get a client representation */
1071 error = nfs_init_server(server, fc);
1072 if (error < 0)
1073 goto error;
1074
1075 /* Probe the root fh to retrieve its FSID */
1076 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
1077 if (error < 0)
1078 goto error;
1079 if (server->nfs_client->rpc_ops->version == 3) {
1080 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1081 server->namelen = NFS3_MAXNAMLEN;
1082 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
1083 server->caps |= NFS_CAP_READDIRPLUS;
1084 } else {
1085 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1086 server->namelen = NFS2_MAXNAMLEN;
1087 }
1088
1089 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1090 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh,
1091 fattr, NULL);
1092 if (error < 0) {
1093 dprintk("nfs_create_server: getattr error = %d\n", -error);
1094 goto error;
1095 }
1096 }
1097 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1098
1099 dprintk("Server FSID: %llx:%llx\n",
1100 (unsigned long long) server->fsid.major,
1101 (unsigned long long) server->fsid.minor);
1102
1103 nfs_server_insert_lists(server);
1104 server->mount_time = jiffies;
1105 nfs_free_fattr(fattr);
1106 return server;
1107
1108error:
1109 nfs_free_fattr(fattr);
1110 nfs_free_server(server);
1111 return ERR_PTR(error);
1112}
1113EXPORT_SYMBOL_GPL(nfs_create_server);
1114
1115/*
1116 * Clone an NFS2, NFS3 or NFS4 server record
1117 */
1118struct nfs_server *nfs_clone_server(struct nfs_server *source,
1119 struct nfs_fh *fh,
1120 struct nfs_fattr *fattr,
1121 rpc_authflavor_t flavor)
1122{
1123 struct nfs_server *server;
1124 int error;
1125
1126 server = nfs_alloc_server();
1127 if (!server)
1128 return ERR_PTR(-ENOMEM);
1129
1130 server->cred = get_cred(source->cred);
1131
1132 /* Copy data from the source */
1133 server->nfs_client = source->nfs_client;
1134 server->destroy = source->destroy;
1135 refcount_inc(&server->nfs_client->cl_count);
1136 nfs_server_copy_userdata(server, source);
1137
1138 server->fsid = fattr->fsid;
1139
1140 nfs_sysfs_add_server(server);
1141
1142 nfs_sysfs_link_rpc_client(server,
1143 server->nfs_client->cl_rpcclient, "_state");
1144
1145 error = nfs_init_server_rpcclient(server,
1146 source->client->cl_timeout,
1147 flavor);
1148 if (error < 0)
1149 goto out_free_server;
1150
1151 /* probe the filesystem info for this server filesystem */
1152 error = nfs_probe_server(server, fh);
1153 if (error < 0)
1154 goto out_free_server;
1155
1156 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1157 server->namelen = NFS4_MAXNAMLEN;
1158
1159 error = nfs_start_lockd(server);
1160 if (error < 0)
1161 goto out_free_server;
1162
1163 nfs_server_insert_lists(server);
1164 server->mount_time = jiffies;
1165
1166 return server;
1167
1168out_free_server:
1169 nfs_free_server(server);
1170 return ERR_PTR(error);
1171}
1172EXPORT_SYMBOL_GPL(nfs_clone_server);
1173
1174void nfs_clients_init(struct net *net)
1175{
1176 struct nfs_net *nn = net_generic(net, nfs_net_id);
1177
1178 INIT_LIST_HEAD(&nn->nfs_client_list);
1179 INIT_LIST_HEAD(&nn->nfs_volume_list);
1180#if IS_ENABLED(CONFIG_NFS_V4)
1181 idr_init(&nn->cb_ident_idr);
1182#endif
1183 spin_lock_init(&nn->nfs_client_lock);
1184 nn->boot_time = ktime_get_real();
1185
1186 nfs_netns_sysfs_setup(nn, net);
1187}
1188
1189void nfs_clients_exit(struct net *net)
1190{
1191 struct nfs_net *nn = net_generic(net, nfs_net_id);
1192
1193 nfs_netns_sysfs_destroy(nn);
1194 nfs_cleanup_cb_ident_idr(net);
1195 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
1196 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1197}
1198
1199#ifdef CONFIG_PROC_FS
1200static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1201static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1202static void nfs_server_list_stop(struct seq_file *p, void *v);
1203static int nfs_server_list_show(struct seq_file *m, void *v);
1204
1205static const struct seq_operations nfs_server_list_ops = {
1206 .start = nfs_server_list_start,
1207 .next = nfs_server_list_next,
1208 .stop = nfs_server_list_stop,
1209 .show = nfs_server_list_show,
1210};
1211
1212static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1213static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1214static void nfs_volume_list_stop(struct seq_file *p, void *v);
1215static int nfs_volume_list_show(struct seq_file *m, void *v);
1216
1217static const struct seq_operations nfs_volume_list_ops = {
1218 .start = nfs_volume_list_start,
1219 .next = nfs_volume_list_next,
1220 .stop = nfs_volume_list_stop,
1221 .show = nfs_volume_list_show,
1222};
1223
1224/*
1225 * set up the iterator to start reading from the server list and return the first item
1226 */
1227static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1228 __acquires(&nn->nfs_client_lock)
1229{
1230 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1231
1232 /* lock the list against modification */
1233 spin_lock(&nn->nfs_client_lock);
1234 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1235}
1236
1237/*
1238 * move to next server
1239 */
1240static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1241{
1242 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1243
1244 return seq_list_next(v, &nn->nfs_client_list, pos);
1245}
1246
1247/*
1248 * clean up after reading from the transports list
1249 */
1250static void nfs_server_list_stop(struct seq_file *p, void *v)
1251 __releases(&nn->nfs_client_lock)
1252{
1253 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1254
1255 spin_unlock(&nn->nfs_client_lock);
1256}
1257
1258/*
1259 * display a header line followed by a load of call lines
1260 */
1261static int nfs_server_list_show(struct seq_file *m, void *v)
1262{
1263 struct nfs_client *clp;
1264 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1265
1266 /* display header on line 1 */
1267 if (v == &nn->nfs_client_list) {
1268 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1269 return 0;
1270 }
1271
1272 /* display one transport per line on subsequent lines */
1273 clp = list_entry(v, struct nfs_client, cl_share_link);
1274
1275 /* Check if the client is initialized */
1276 if (clp->cl_cons_state != NFS_CS_READY)
1277 return 0;
1278
1279 rcu_read_lock();
1280 seq_printf(m, "v%u %s %s %3d %s\n",
1281 clp->rpc_ops->version,
1282 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1283 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1284 refcount_read(&clp->cl_count),
1285 clp->cl_hostname);
1286 rcu_read_unlock();
1287
1288 return 0;
1289}
1290
1291/*
1292 * set up the iterator to start reading from the volume list and return the first item
1293 */
1294static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1295 __acquires(&nn->nfs_client_lock)
1296{
1297 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1298
1299 /* lock the list against modification */
1300 spin_lock(&nn->nfs_client_lock);
1301 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1302}
1303
1304/*
1305 * move to next volume
1306 */
1307static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1308{
1309 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1310
1311 return seq_list_next(v, &nn->nfs_volume_list, pos);
1312}
1313
1314/*
1315 * clean up after reading from the transports list
1316 */
1317static void nfs_volume_list_stop(struct seq_file *p, void *v)
1318 __releases(&nn->nfs_client_lock)
1319{
1320 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1321
1322 spin_unlock(&nn->nfs_client_lock);
1323}
1324
1325/*
1326 * display a header line followed by a load of call lines
1327 */
1328static int nfs_volume_list_show(struct seq_file *m, void *v)
1329{
1330 struct nfs_server *server;
1331 struct nfs_client *clp;
1332 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1333 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1334 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1335
1336 /* display header on line 1 */
1337 if (v == &nn->nfs_volume_list) {
1338 seq_puts(m, "NV SERVER PORT DEV FSID"
1339 " FSC\n");
1340 return 0;
1341 }
1342 /* display one transport per line on subsequent lines */
1343 server = list_entry(v, struct nfs_server, master_link);
1344 clp = server->nfs_client;
1345
1346 snprintf(dev, sizeof(dev), "%u:%u",
1347 MAJOR(server->s_dev), MINOR(server->s_dev));
1348
1349 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1350 (unsigned long long) server->fsid.major,
1351 (unsigned long long) server->fsid.minor);
1352
1353 rcu_read_lock();
1354 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1355 clp->rpc_ops->version,
1356 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1357 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1358 dev,
1359 fsid,
1360 nfs_server_fscache_state(server));
1361 rcu_read_unlock();
1362
1363 return 0;
1364}
1365
1366int nfs_fs_proc_net_init(struct net *net)
1367{
1368 struct nfs_net *nn = net_generic(net, nfs_net_id);
1369 struct proc_dir_entry *p;
1370
1371 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1372 if (!nn->proc_nfsfs)
1373 goto error_0;
1374
1375 /* a file of servers with which we're dealing */
1376 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1377 &nfs_server_list_ops, sizeof(struct seq_net_private));
1378 if (!p)
1379 goto error_1;
1380
1381 /* a file of volumes that we have mounted */
1382 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1383 &nfs_volume_list_ops, sizeof(struct seq_net_private));
1384 if (!p)
1385 goto error_1;
1386 return 0;
1387
1388error_1:
1389 remove_proc_subtree("nfsfs", net->proc_net);
1390error_0:
1391 return -ENOMEM;
1392}
1393
1394void nfs_fs_proc_net_exit(struct net *net)
1395{
1396 remove_proc_subtree("nfsfs", net->proc_net);
1397}
1398
1399/*
1400 * initialise the /proc/fs/nfsfs/ directory
1401 */
1402int __init nfs_fs_proc_init(void)
1403{
1404 if (!proc_mkdir("fs/nfsfs", NULL))
1405 goto error_0;
1406
1407 /* a file of servers with which we're dealing */
1408 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1409 goto error_1;
1410
1411 /* a file of volumes that we have mounted */
1412 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1413 goto error_1;
1414
1415 return 0;
1416error_1:
1417 remove_proc_subtree("fs/nfsfs", NULL);
1418error_0:
1419 return -ENOMEM;
1420}
1421
1422/*
1423 * clean up the /proc/fs/nfsfs/ directory
1424 */
1425void nfs_fs_proc_exit(void)
1426{
1427 remove_proc_subtree("fs/nfsfs", NULL);
1428 ida_destroy(&s_sysfs_ids);
1429}
1430
1431#endif /* CONFIG_PROC_FS */
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 */