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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 .pipe_dir_name = NFS_PIPE_DIRNAME,
77};
78
79static struct nfs_subversion *find_nfs_version(unsigned int version)
80{
81 struct nfs_subversion *nfs;
82 spin_lock(&nfs_version_lock);
83
84 list_for_each_entry(nfs, &nfs_versions, list) {
85 if (nfs->rpc_ops->version == version) {
86 spin_unlock(&nfs_version_lock);
87 return nfs;
88 }
89 }
90
91 spin_unlock(&nfs_version_lock);
92 return ERR_PTR(-EPROTONOSUPPORT);
93}
94
95struct nfs_subversion *get_nfs_version(unsigned int version)
96{
97 struct nfs_subversion *nfs = find_nfs_version(version);
98
99 if (IS_ERR(nfs)) {
100 mutex_lock(&nfs_version_mutex);
101 request_module("nfsv%d", version);
102 nfs = find_nfs_version(version);
103 mutex_unlock(&nfs_version_mutex);
104 }
105
106 if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
107 return ERR_PTR(-EAGAIN);
108 return nfs;
109}
110
111void put_nfs_version(struct nfs_subversion *nfs)
112{
113 module_put(nfs->owner);
114}
115
116void register_nfs_version(struct nfs_subversion *nfs)
117{
118 spin_lock(&nfs_version_lock);
119
120 list_add(&nfs->list, &nfs_versions);
121 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
122
123 spin_unlock(&nfs_version_lock);
124}
125EXPORT_SYMBOL_GPL(register_nfs_version);
126
127void unregister_nfs_version(struct nfs_subversion *nfs)
128{
129 spin_lock(&nfs_version_lock);
130
131 nfs_version[nfs->rpc_ops->version] = NULL;
132 list_del(&nfs->list);
133
134 spin_unlock(&nfs_version_lock);
135}
136EXPORT_SYMBOL_GPL(unregister_nfs_version);
137
138/*
139 * Allocate a shared client record
140 *
141 * Since these are allocated/deallocated very rarely, we don't
142 * bother putting them in a slab cache...
143 */
144struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
145{
146 struct nfs_client *clp;
147 int err = -ENOMEM;
148
149 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
150 goto error_0;
151
152 clp->cl_minorversion = cl_init->minorversion;
153 clp->cl_nfs_mod = cl_init->nfs_mod;
154 if (!try_module_get(clp->cl_nfs_mod->owner))
155 goto error_dealloc;
156
157 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
158
159 refcount_set(&clp->cl_count, 1);
160 clp->cl_cons_state = NFS_CS_INITING;
161
162 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
163 clp->cl_addrlen = cl_init->addrlen;
164
165 if (cl_init->hostname) {
166 err = -ENOMEM;
167 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
168 if (!clp->cl_hostname)
169 goto error_cleanup;
170 }
171
172 INIT_LIST_HEAD(&clp->cl_superblocks);
173 clp->cl_rpcclient = ERR_PTR(-EINVAL);
174
175 clp->cl_flags = cl_init->init_flags;
176 clp->cl_proto = cl_init->proto;
177 clp->cl_nconnect = cl_init->nconnect;
178 clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1;
179 clp->cl_net = get_net(cl_init->net);
180
181 clp->cl_principal = "*";
182 clp->cl_xprtsec = cl_init->xprtsec;
183 return clp;
184
185error_cleanup:
186 put_nfs_version(clp->cl_nfs_mod);
187error_dealloc:
188 kfree(clp);
189error_0:
190 return ERR_PTR(err);
191}
192EXPORT_SYMBOL_GPL(nfs_alloc_client);
193
194#if IS_ENABLED(CONFIG_NFS_V4)
195static void nfs_cleanup_cb_ident_idr(struct net *net)
196{
197 struct nfs_net *nn = net_generic(net, nfs_net_id);
198
199 idr_destroy(&nn->cb_ident_idr);
200}
201
202/* nfs_client_lock held */
203static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
204{
205 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
206
207 if (clp->cl_cb_ident)
208 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
209}
210
211static void pnfs_init_server(struct nfs_server *server)
212{
213 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
214}
215
216#else
217static void nfs_cleanup_cb_ident_idr(struct net *net)
218{
219}
220
221static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
222{
223}
224
225static void pnfs_init_server(struct nfs_server *server)
226{
227}
228
229#endif /* CONFIG_NFS_V4 */
230
231/*
232 * Destroy a shared client record
233 */
234void nfs_free_client(struct nfs_client *clp)
235{
236 /* -EIO all pending I/O */
237 if (!IS_ERR(clp->cl_rpcclient))
238 rpc_shutdown_client(clp->cl_rpcclient);
239
240 put_net(clp->cl_net);
241 put_nfs_version(clp->cl_nfs_mod);
242 kfree(clp->cl_hostname);
243 kfree(clp->cl_acceptor);
244 kfree_rcu(clp, rcu);
245}
246EXPORT_SYMBOL_GPL(nfs_free_client);
247
248/*
249 * Release a reference to a shared client record
250 */
251void nfs_put_client(struct nfs_client *clp)
252{
253 struct nfs_net *nn;
254
255 if (!clp)
256 return;
257
258 nn = net_generic(clp->cl_net, nfs_net_id);
259
260 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
261 list_del(&clp->cl_share_link);
262 nfs_cb_idr_remove_locked(clp);
263 spin_unlock(&nn->nfs_client_lock);
264
265 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
266
267 clp->rpc_ops->free_client(clp);
268 }
269}
270EXPORT_SYMBOL_GPL(nfs_put_client);
271
272/*
273 * Find an nfs_client on the list that matches the initialisation data
274 * that is supplied.
275 */
276static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
277{
278 struct nfs_client *clp;
279 const struct sockaddr *sap = (struct sockaddr *)data->addr;
280 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
281 int error;
282
283again:
284 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
285 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
286 /* Don't match clients that failed to initialise properly */
287 if (clp->cl_cons_state < 0)
288 continue;
289
290 /* If a client is still initializing then we need to wait */
291 if (clp->cl_cons_state > NFS_CS_READY) {
292 refcount_inc(&clp->cl_count);
293 spin_unlock(&nn->nfs_client_lock);
294 error = nfs_wait_client_init_complete(clp);
295 nfs_put_client(clp);
296 spin_lock(&nn->nfs_client_lock);
297 if (error < 0)
298 return ERR_PTR(error);
299 goto again;
300 }
301
302 /* Different NFS versions cannot share the same nfs_client */
303 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
304 continue;
305
306 if (clp->cl_proto != data->proto)
307 continue;
308 /* Match nfsv4 minorversion */
309 if (clp->cl_minorversion != data->minorversion)
310 continue;
311
312 /* Match request for a dedicated DS */
313 if (test_bit(NFS_CS_DS, &data->init_flags) !=
314 test_bit(NFS_CS_DS, &clp->cl_flags))
315 continue;
316
317 /* Match the full socket address */
318 if (!rpc_cmp_addr_port(sap, clap))
319 /* Match all xprt_switch full socket addresses */
320 if (IS_ERR(clp->cl_rpcclient) ||
321 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
322 sap))
323 continue;
324
325 /* Match the xprt security policy */
326 if (clp->cl_xprtsec.policy != data->xprtsec.policy)
327 continue;
328
329 refcount_inc(&clp->cl_count);
330 return clp;
331 }
332 return NULL;
333}
334
335/*
336 * Return true if @clp is done initializing, false if still working on it.
337 *
338 * Use nfs_client_init_status to check if it was successful.
339 */
340bool nfs_client_init_is_complete(const struct nfs_client *clp)
341{
342 return clp->cl_cons_state <= NFS_CS_READY;
343}
344EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
345
346/*
347 * Return 0 if @clp was successfully initialized, -errno otherwise.
348 *
349 * This must be called *after* nfs_client_init_is_complete() returns true,
350 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
351 */
352int nfs_client_init_status(const struct nfs_client *clp)
353{
354 /* called without checking nfs_client_init_is_complete */
355 if (clp->cl_cons_state > NFS_CS_READY) {
356 WARN_ON_ONCE(1);
357 return -EINVAL;
358 }
359 return clp->cl_cons_state;
360}
361EXPORT_SYMBOL_GPL(nfs_client_init_status);
362
363int nfs_wait_client_init_complete(const struct nfs_client *clp)
364{
365 return wait_event_killable(nfs_client_active_wq,
366 nfs_client_init_is_complete(clp));
367}
368EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
369
370/*
371 * Found an existing client. Make sure it's ready before returning.
372 */
373static struct nfs_client *
374nfs_found_client(const struct nfs_client_initdata *cl_init,
375 struct nfs_client *clp)
376{
377 int error;
378
379 error = nfs_wait_client_init_complete(clp);
380 if (error < 0) {
381 nfs_put_client(clp);
382 return ERR_PTR(-ERESTARTSYS);
383 }
384
385 if (clp->cl_cons_state < NFS_CS_READY) {
386 error = clp->cl_cons_state;
387 nfs_put_client(clp);
388 return ERR_PTR(error);
389 }
390
391 smp_rmb();
392 return clp;
393}
394
395/*
396 * Look up a client by IP address and protocol version
397 * - creates a new record if one doesn't yet exist
398 */
399struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
400{
401 struct nfs_client *clp, *new = NULL;
402 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
403 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
404
405 if (cl_init->hostname == NULL) {
406 WARN_ON(1);
407 return ERR_PTR(-EINVAL);
408 }
409
410 /* see if the client already exists */
411 do {
412 spin_lock(&nn->nfs_client_lock);
413
414 clp = nfs_match_client(cl_init);
415 if (clp) {
416 spin_unlock(&nn->nfs_client_lock);
417 if (new)
418 new->rpc_ops->free_client(new);
419 if (IS_ERR(clp))
420 return clp;
421 return nfs_found_client(cl_init, clp);
422 }
423 if (new) {
424 list_add_tail(&new->cl_share_link,
425 &nn->nfs_client_list);
426 spin_unlock(&nn->nfs_client_lock);
427 return rpc_ops->init_client(new, cl_init);
428 }
429
430 spin_unlock(&nn->nfs_client_lock);
431
432 new = rpc_ops->alloc_client(cl_init);
433 } while (!IS_ERR(new));
434
435 return new;
436}
437EXPORT_SYMBOL_GPL(nfs_get_client);
438
439/*
440 * Mark a server as ready or failed
441 */
442void nfs_mark_client_ready(struct nfs_client *clp, int state)
443{
444 smp_wmb();
445 clp->cl_cons_state = state;
446 wake_up_all(&nfs_client_active_wq);
447}
448EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
449
450/*
451 * Initialise the timeout values for a connection
452 */
453void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
454 int timeo, int retrans)
455{
456 to->to_initval = timeo * HZ / 10;
457 to->to_retries = retrans;
458
459 switch (proto) {
460 case XPRT_TRANSPORT_TCP:
461 case XPRT_TRANSPORT_TCP_TLS:
462 case XPRT_TRANSPORT_RDMA:
463 if (retrans == NFS_UNSPEC_RETRANS)
464 to->to_retries = NFS_DEF_TCP_RETRANS;
465 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
466 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
467 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
468 to->to_initval = NFS_MAX_TCP_TIMEOUT;
469 to->to_increment = to->to_initval;
470 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
471 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
472 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
473 if (to->to_maxval < to->to_initval)
474 to->to_maxval = to->to_initval;
475 to->to_exponential = 0;
476 break;
477 case XPRT_TRANSPORT_UDP:
478 if (retrans == NFS_UNSPEC_RETRANS)
479 to->to_retries = NFS_DEF_UDP_RETRANS;
480 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
481 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
482 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
483 to->to_initval = NFS_MAX_UDP_TIMEOUT;
484 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
485 to->to_exponential = 1;
486 break;
487 default:
488 BUG();
489 }
490}
491EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
492
493/*
494 * Create an RPC client handle
495 */
496int nfs_create_rpc_client(struct nfs_client *clp,
497 const struct nfs_client_initdata *cl_init,
498 rpc_authflavor_t flavor)
499{
500 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
501 struct rpc_clnt *clnt = NULL;
502 struct rpc_create_args args = {
503 .net = clp->cl_net,
504 .protocol = clp->cl_proto,
505 .nconnect = clp->cl_nconnect,
506 .address = (struct sockaddr *)&clp->cl_addr,
507 .addrsize = clp->cl_addrlen,
508 .timeout = cl_init->timeparms,
509 .servername = clp->cl_hostname,
510 .nodename = cl_init->nodename,
511 .program = &nfs_program,
512 .stats = &nn->rpcstats,
513 .version = clp->rpc_ops->version,
514 .authflavor = flavor,
515 .cred = cl_init->cred,
516 .xprtsec = cl_init->xprtsec,
517 .connect_timeout = cl_init->connect_timeout,
518 .reconnect_timeout = cl_init->reconnect_timeout,
519 };
520
521 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
522 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
523 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
524 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
525 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
526 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
527 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
528 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
529 if (test_bit(NFS_CS_NOPING, &clp->cl_flags))
530 args.flags |= RPC_CLNT_CREATE_NOPING;
531 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags))
532 args.flags |= RPC_CLNT_CREATE_REUSEPORT;
533
534 if (!IS_ERR(clp->cl_rpcclient))
535 return 0;
536
537 clnt = rpc_create(&args);
538 if (IS_ERR(clnt)) {
539 dprintk("%s: cannot create RPC client. Error = %ld\n",
540 __func__, PTR_ERR(clnt));
541 return PTR_ERR(clnt);
542 }
543
544 clnt->cl_principal = clp->cl_principal;
545 clp->cl_rpcclient = clnt;
546 clnt->cl_max_connect = clp->cl_max_connect;
547 return 0;
548}
549EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
550
551/*
552 * Version 2 or 3 client destruction
553 */
554static void nfs_destroy_server(struct nfs_server *server)
555{
556 if (server->nlm_host)
557 nlmclnt_done(server->nlm_host);
558}
559
560/*
561 * Version 2 or 3 lockd setup
562 */
563static int nfs_start_lockd(struct nfs_server *server)
564{
565 struct nlm_host *host;
566 struct nfs_client *clp = server->nfs_client;
567 struct nlmclnt_initdata nlm_init = {
568 .hostname = clp->cl_hostname,
569 .address = (struct sockaddr *)&clp->cl_addr,
570 .addrlen = clp->cl_addrlen,
571 .nfs_version = clp->rpc_ops->version,
572 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
573 1 : 0,
574 .net = clp->cl_net,
575 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
576 .cred = server->cred,
577 };
578
579 if (nlm_init.nfs_version > 3)
580 return 0;
581 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
582 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
583 return 0;
584
585 switch (clp->cl_proto) {
586 default:
587 nlm_init.protocol = IPPROTO_TCP;
588 break;
589#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
590 case XPRT_TRANSPORT_UDP:
591 nlm_init.protocol = IPPROTO_UDP;
592#endif
593 }
594
595 host = nlmclnt_init(&nlm_init);
596 if (IS_ERR(host))
597 return PTR_ERR(host);
598
599 server->nlm_host = host;
600 server->destroy = nfs_destroy_server;
601 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL);
602 return 0;
603}
604
605/*
606 * Create a general RPC client
607 */
608int nfs_init_server_rpcclient(struct nfs_server *server,
609 const struct rpc_timeout *timeo,
610 rpc_authflavor_t pseudoflavour)
611{
612 struct nfs_client *clp = server->nfs_client;
613
614 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
615 pseudoflavour);
616 if (IS_ERR(server->client)) {
617 dprintk("%s: couldn't create rpc_client!\n", __func__);
618 return PTR_ERR(server->client);
619 }
620
621 memcpy(&server->client->cl_timeout_default,
622 timeo,
623 sizeof(server->client->cl_timeout_default));
624 server->client->cl_timeout = &server->client->cl_timeout_default;
625 server->client->cl_softrtry = 0;
626 if (server->flags & NFS_MOUNT_SOFTERR)
627 server->client->cl_softerr = 1;
628 if (server->flags & NFS_MOUNT_SOFT)
629 server->client->cl_softrtry = 1;
630
631 nfs_sysfs_link_rpc_client(server, server->client, NULL);
632 return 0;
633}
634EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
635
636/**
637 * nfs_init_client - Initialise an NFS2 or NFS3 client
638 *
639 * @clp: nfs_client to initialise
640 * @cl_init: Initialisation parameters
641 *
642 * Returns pointer to an NFS client, or an ERR_PTR value.
643 */
644struct nfs_client *nfs_init_client(struct nfs_client *clp,
645 const struct nfs_client_initdata *cl_init)
646{
647 int error;
648
649 /* the client is already initialised */
650 if (clp->cl_cons_state == NFS_CS_READY)
651 return clp;
652
653 /*
654 * Create a client RPC handle for doing FSSTAT with UNIX auth only
655 * - RFC 2623, sec 2.3.2
656 */
657 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
658 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
659 if (error < 0) {
660 nfs_put_client(clp);
661 clp = ERR_PTR(error);
662 }
663 return clp;
664}
665EXPORT_SYMBOL_GPL(nfs_init_client);
666
667/*
668 * Create a version 2 or 3 client
669 */
670static int nfs_init_server(struct nfs_server *server,
671 const struct fs_context *fc)
672{
673 const struct nfs_fs_context *ctx = nfs_fc2context(fc);
674 struct rpc_timeout timeparms;
675 struct nfs_client_initdata cl_init = {
676 .hostname = ctx->nfs_server.hostname,
677 .addr = &ctx->nfs_server._address,
678 .addrlen = ctx->nfs_server.addrlen,
679 .nfs_mod = ctx->nfs_mod,
680 .proto = ctx->nfs_server.protocol,
681 .net = fc->net_ns,
682 .timeparms = &timeparms,
683 .cred = server->cred,
684 .nconnect = ctx->nfs_server.nconnect,
685 .init_flags = (1UL << NFS_CS_REUSEPORT),
686 .xprtsec = ctx->xprtsec,
687 };
688 struct nfs_client *clp;
689 int error;
690
691 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
692 ctx->timeo, ctx->retrans);
693 if (ctx->flags & NFS_MOUNT_NORESVPORT)
694 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
695
696 /* Allocate or find a client reference we can use */
697 clp = nfs_get_client(&cl_init);
698 if (IS_ERR(clp))
699 return PTR_ERR(clp);
700
701 server->nfs_client = clp;
702 nfs_sysfs_add_server(server);
703 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state");
704
705 /* Initialise the client representation from the mount data */
706 server->flags = ctx->flags;
707 server->options = ctx->options;
708 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS;
709
710 switch (clp->rpc_ops->version) {
711 case 2:
712 server->fattr_valid = NFS_ATTR_FATTR_V2;
713 break;
714 case 3:
715 server->fattr_valid = NFS_ATTR_FATTR_V3;
716 break;
717 default:
718 server->fattr_valid = NFS_ATTR_FATTR_V4;
719 }
720
721 if (ctx->rsize)
722 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto);
723 if (ctx->wsize)
724 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto);
725
726 server->acregmin = ctx->acregmin * HZ;
727 server->acregmax = ctx->acregmax * HZ;
728 server->acdirmin = ctx->acdirmin * HZ;
729 server->acdirmax = ctx->acdirmax * HZ;
730
731 /* Start lockd here, before we might error out */
732 error = nfs_start_lockd(server);
733 if (error < 0)
734 goto error;
735
736 server->port = ctx->nfs_server.port;
737 server->auth_info = ctx->auth_info;
738
739 error = nfs_init_server_rpcclient(server, &timeparms,
740 ctx->selected_flavor);
741 if (error < 0)
742 goto error;
743
744 /* Preserve the values of mount_server-related mount options */
745 if (ctx->mount_server.addrlen) {
746 memcpy(&server->mountd_address, &ctx->mount_server.address,
747 ctx->mount_server.addrlen);
748 server->mountd_addrlen = ctx->mount_server.addrlen;
749 }
750 server->mountd_version = ctx->mount_server.version;
751 server->mountd_port = ctx->mount_server.port;
752 server->mountd_protocol = ctx->mount_server.protocol;
753
754 server->namelen = ctx->namlen;
755 return 0;
756
757error:
758 server->nfs_client = NULL;
759 nfs_put_client(clp);
760 return error;
761}
762
763/*
764 * Load up the server record from information gained in an fsinfo record
765 */
766static void nfs_server_set_fsinfo(struct nfs_server *server,
767 struct nfs_fsinfo *fsinfo)
768{
769 struct nfs_client *clp = server->nfs_client;
770 unsigned long max_rpc_payload, raw_max_rpc_payload;
771
772 /* Work out a lot of parameters */
773 if (server->rsize == 0)
774 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto);
775 if (server->wsize == 0)
776 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto);
777
778 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
779 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto);
780 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
781 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto);
782
783 raw_max_rpc_payload = rpc_max_payload(server->client);
784 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL);
785
786 if (server->rsize > max_rpc_payload)
787 server->rsize = max_rpc_payload;
788 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
789 server->rsize = NFS_MAX_FILE_IO_SIZE;
790 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
791
792 if (server->wsize > max_rpc_payload)
793 server->wsize = max_rpc_payload;
794 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
795 server->wsize = NFS_MAX_FILE_IO_SIZE;
796 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
797
798 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
799
800 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
801 if (server->dtsize > NFS_MAX_FILE_IO_SIZE)
802 server->dtsize = NFS_MAX_FILE_IO_SIZE;
803 if (server->dtsize > server->rsize)
804 server->dtsize = server->rsize;
805
806 if (server->flags & NFS_MOUNT_NOAC) {
807 server->acregmin = server->acregmax = 0;
808 server->acdirmin = server->acdirmax = 0;
809 }
810
811 server->maxfilesize = fsinfo->maxfilesize;
812
813 server->time_delta = fsinfo->time_delta;
814 server->change_attr_type = fsinfo->change_attr_type;
815
816 server->clone_blksize = fsinfo->clone_blksize;
817 /* We're airborne Set socket buffersize */
818 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
819
820#ifdef CONFIG_NFS_V4_2
821 /*
822 * Defaults until limited by the session parameters.
823 */
824 server->gxasize = min_t(unsigned int, raw_max_rpc_payload,
825 XATTR_SIZE_MAX);
826 server->sxasize = min_t(unsigned int, raw_max_rpc_payload,
827 XATTR_SIZE_MAX);
828 server->lxasize = min_t(unsigned int, raw_max_rpc_payload,
829 nfs42_listxattr_xdrsize(XATTR_LIST_MAX));
830
831 if (fsinfo->xattr_support)
832 server->caps |= NFS_CAP_XATTR;
833#endif
834}
835
836/*
837 * Probe filesystem information, including the FSID on v2/v3
838 */
839static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
840{
841 struct nfs_fsinfo fsinfo;
842 struct nfs_client *clp = server->nfs_client;
843 int error;
844
845 if (clp->rpc_ops->set_capabilities != NULL) {
846 error = clp->rpc_ops->set_capabilities(server, mntfh);
847 if (error < 0)
848 return error;
849 }
850
851 fsinfo.fattr = fattr;
852 fsinfo.nlayouttypes = 0;
853 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
854 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
855 if (error < 0)
856 return error;
857
858 nfs_server_set_fsinfo(server, &fsinfo);
859
860 /* Get some general file system info */
861 if (server->namelen == 0) {
862 struct nfs_pathconf pathinfo;
863
864 pathinfo.fattr = fattr;
865 nfs_fattr_init(fattr);
866
867 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
868 server->namelen = pathinfo.max_namelen;
869 }
870
871 if (clp->rpc_ops->discover_trunking != NULL &&
872 (server->caps & NFS_CAP_FS_LOCATIONS &&
873 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) {
874 error = clp->rpc_ops->discover_trunking(server, mntfh);
875 if (error < 0)
876 return error;
877 }
878
879 return 0;
880}
881
882/*
883 * Grab the destination's particulars, including lease expiry time.
884 *
885 * Returns zero if probe succeeded and retrieved FSID matches the FSID
886 * we have cached.
887 */
888int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh)
889{
890 struct nfs_fattr *fattr;
891 int error;
892
893 fattr = nfs_alloc_fattr();
894 if (fattr == NULL)
895 return -ENOMEM;
896
897 /* Sanity: the probe won't work if the destination server
898 * does not recognize the migrated FH. */
899 error = nfs_probe_fsinfo(server, mntfh, fattr);
900
901 nfs_free_fattr(fattr);
902 return error;
903}
904EXPORT_SYMBOL_GPL(nfs_probe_server);
905
906/*
907 * Copy useful information when duplicating a server record
908 */
909void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
910{
911 target->flags = source->flags;
912 target->rsize = source->rsize;
913 target->wsize = source->wsize;
914 target->acregmin = source->acregmin;
915 target->acregmax = source->acregmax;
916 target->acdirmin = source->acdirmin;
917 target->acdirmax = source->acdirmax;
918 target->caps = source->caps;
919 target->options = source->options;
920 target->auth_info = source->auth_info;
921 target->port = source->port;
922}
923EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
924
925void nfs_server_insert_lists(struct nfs_server *server)
926{
927 struct nfs_client *clp = server->nfs_client;
928 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
929
930 spin_lock(&nn->nfs_client_lock);
931 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
932 list_add_tail(&server->master_link, &nn->nfs_volume_list);
933 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
934 spin_unlock(&nn->nfs_client_lock);
935
936}
937EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
938
939void nfs_server_remove_lists(struct nfs_server *server)
940{
941 struct nfs_client *clp = server->nfs_client;
942 struct nfs_net *nn;
943
944 if (clp == NULL)
945 return;
946 nn = net_generic(clp->cl_net, nfs_net_id);
947 spin_lock(&nn->nfs_client_lock);
948 list_del_rcu(&server->client_link);
949 if (list_empty(&clp->cl_superblocks))
950 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
951 list_del(&server->master_link);
952 spin_unlock(&nn->nfs_client_lock);
953
954 synchronize_rcu();
955}
956EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
957
958static DEFINE_IDA(s_sysfs_ids);
959
960/*
961 * Allocate and initialise a server record
962 */
963struct nfs_server *nfs_alloc_server(void)
964{
965 struct nfs_server *server;
966
967 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
968 if (!server)
969 return NULL;
970
971 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL);
972 if (server->s_sysfs_id < 0) {
973 kfree(server);
974 return NULL;
975 }
976
977 server->client = server->client_acl = ERR_PTR(-EINVAL);
978
979 /* Zero out the NFS state stuff */
980 INIT_LIST_HEAD(&server->client_link);
981 INIT_LIST_HEAD(&server->master_link);
982 INIT_LIST_HEAD(&server->delegations);
983 INIT_LIST_HEAD(&server->layouts);
984 INIT_LIST_HEAD(&server->state_owners_lru);
985 INIT_LIST_HEAD(&server->ss_copies);
986
987 atomic_set(&server->active, 0);
988
989 server->io_stats = nfs_alloc_iostats();
990 if (!server->io_stats) {
991 kfree(server);
992 return NULL;
993 }
994
995 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
996
997 ida_init(&server->openowner_id);
998 ida_init(&server->lockowner_id);
999 pnfs_init_server(server);
1000 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
1001
1002 return server;
1003}
1004EXPORT_SYMBOL_GPL(nfs_alloc_server);
1005
1006static void delayed_free(struct rcu_head *p)
1007{
1008 struct nfs_server *server = container_of(p, struct nfs_server, rcu);
1009
1010 nfs_free_iostats(server->io_stats);
1011 kfree(server);
1012}
1013
1014/*
1015 * Free up a server record
1016 */
1017void nfs_free_server(struct nfs_server *server)
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 if (server->kobj.state_initialized) {
1032 nfs_sysfs_remove_server(server);
1033 kobject_put(&server->kobj);
1034 }
1035 ida_free(&s_sysfs_ids, server->s_sysfs_id);
1036
1037 ida_destroy(&server->lockowner_id);
1038 ida_destroy(&server->openowner_id);
1039 put_cred(server->cred);
1040 nfs_release_automount_timer();
1041 call_rcu(&server->rcu, delayed_free);
1042}
1043EXPORT_SYMBOL_GPL(nfs_free_server);
1044
1045/*
1046 * Create a version 2 or 3 volume record
1047 * - keyed on server and FSID
1048 */
1049struct nfs_server *nfs_create_server(struct fs_context *fc)
1050{
1051 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1052 struct nfs_server *server;
1053 struct nfs_fattr *fattr;
1054 int error;
1055
1056 server = nfs_alloc_server();
1057 if (!server)
1058 return ERR_PTR(-ENOMEM);
1059
1060 server->cred = get_cred(fc->cred);
1061
1062 error = -ENOMEM;
1063 fattr = nfs_alloc_fattr();
1064 if (fattr == NULL)
1065 goto error;
1066
1067 /* Get a client representation */
1068 error = nfs_init_server(server, fc);
1069 if (error < 0)
1070 goto error;
1071
1072 /* Probe the root fh to retrieve its FSID */
1073 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
1074 if (error < 0)
1075 goto error;
1076 if (server->nfs_client->rpc_ops->version == 3) {
1077 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1078 server->namelen = NFS3_MAXNAMLEN;
1079 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
1080 server->caps |= NFS_CAP_READDIRPLUS;
1081 } else {
1082 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1083 server->namelen = NFS2_MAXNAMLEN;
1084 }
1085
1086 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1087 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh,
1088 fattr, NULL);
1089 if (error < 0) {
1090 dprintk("nfs_create_server: getattr error = %d\n", -error);
1091 goto error;
1092 }
1093 }
1094 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1095
1096 dprintk("Server FSID: %llx:%llx\n",
1097 (unsigned long long) server->fsid.major,
1098 (unsigned long long) server->fsid.minor);
1099
1100 nfs_server_insert_lists(server);
1101 server->mount_time = jiffies;
1102 nfs_free_fattr(fattr);
1103 return server;
1104
1105error:
1106 nfs_free_fattr(fattr);
1107 nfs_free_server(server);
1108 return ERR_PTR(error);
1109}
1110EXPORT_SYMBOL_GPL(nfs_create_server);
1111
1112/*
1113 * Clone an NFS2, NFS3 or NFS4 server record
1114 */
1115struct nfs_server *nfs_clone_server(struct nfs_server *source,
1116 struct nfs_fh *fh,
1117 struct nfs_fattr *fattr,
1118 rpc_authflavor_t flavor)
1119{
1120 struct nfs_server *server;
1121 int error;
1122
1123 server = nfs_alloc_server();
1124 if (!server)
1125 return ERR_PTR(-ENOMEM);
1126
1127 server->cred = get_cred(source->cred);
1128
1129 /* Copy data from the source */
1130 server->nfs_client = source->nfs_client;
1131 server->destroy = source->destroy;
1132 refcount_inc(&server->nfs_client->cl_count);
1133 nfs_server_copy_userdata(server, source);
1134
1135 server->fsid = fattr->fsid;
1136
1137 nfs_sysfs_add_server(server);
1138
1139 nfs_sysfs_link_rpc_client(server,
1140 server->nfs_client->cl_rpcclient, "_state");
1141
1142 error = nfs_init_server_rpcclient(server,
1143 source->client->cl_timeout,
1144 flavor);
1145 if (error < 0)
1146 goto out_free_server;
1147
1148 /* probe the filesystem info for this server filesystem */
1149 error = nfs_probe_server(server, fh);
1150 if (error < 0)
1151 goto out_free_server;
1152
1153 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1154 server->namelen = NFS4_MAXNAMLEN;
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 return server;
1164
1165out_free_server:
1166 nfs_free_server(server);
1167 return ERR_PTR(error);
1168}
1169EXPORT_SYMBOL_GPL(nfs_clone_server);
1170
1171void nfs_clients_init(struct net *net)
1172{
1173 struct nfs_net *nn = net_generic(net, nfs_net_id);
1174
1175 INIT_LIST_HEAD(&nn->nfs_client_list);
1176 INIT_LIST_HEAD(&nn->nfs_volume_list);
1177#if IS_ENABLED(CONFIG_NFS_V4)
1178 idr_init(&nn->cb_ident_idr);
1179#endif
1180 spin_lock_init(&nn->nfs_client_lock);
1181 nn->boot_time = ktime_get_real();
1182 memset(&nn->rpcstats, 0, sizeof(nn->rpcstats));
1183 nn->rpcstats.program = &nfs_program;
1184
1185 nfs_netns_sysfs_setup(nn, net);
1186}
1187
1188void nfs_clients_exit(struct net *net)
1189{
1190 struct nfs_net *nn = net_generic(net, nfs_net_id);
1191
1192 nfs_netns_sysfs_destroy(nn);
1193 nfs_cleanup_cb_ident_idr(net);
1194 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
1195 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1196}
1197
1198#ifdef CONFIG_PROC_FS
1199static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1200static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1201static void nfs_server_list_stop(struct seq_file *p, void *v);
1202static int nfs_server_list_show(struct seq_file *m, void *v);
1203
1204static const struct seq_operations nfs_server_list_ops = {
1205 .start = nfs_server_list_start,
1206 .next = nfs_server_list_next,
1207 .stop = nfs_server_list_stop,
1208 .show = nfs_server_list_show,
1209};
1210
1211static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1212static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1213static void nfs_volume_list_stop(struct seq_file *p, void *v);
1214static int nfs_volume_list_show(struct seq_file *m, void *v);
1215
1216static const struct seq_operations nfs_volume_list_ops = {
1217 .start = nfs_volume_list_start,
1218 .next = nfs_volume_list_next,
1219 .stop = nfs_volume_list_stop,
1220 .show = nfs_volume_list_show,
1221};
1222
1223/*
1224 * set up the iterator to start reading from the server list and return the first item
1225 */
1226static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1227 __acquires(&nn->nfs_client_lock)
1228{
1229 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1230
1231 /* lock the list against modification */
1232 spin_lock(&nn->nfs_client_lock);
1233 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1234}
1235
1236/*
1237 * move to next server
1238 */
1239static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1240{
1241 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1242
1243 return seq_list_next(v, &nn->nfs_client_list, pos);
1244}
1245
1246/*
1247 * clean up after reading from the transports list
1248 */
1249static void nfs_server_list_stop(struct seq_file *p, void *v)
1250 __releases(&nn->nfs_client_lock)
1251{
1252 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1253
1254 spin_unlock(&nn->nfs_client_lock);
1255}
1256
1257/*
1258 * display a header line followed by a load of call lines
1259 */
1260static int nfs_server_list_show(struct seq_file *m, void *v)
1261{
1262 struct nfs_client *clp;
1263 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1264
1265 /* display header on line 1 */
1266 if (v == &nn->nfs_client_list) {
1267 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1268 return 0;
1269 }
1270
1271 /* display one transport per line on subsequent lines */
1272 clp = list_entry(v, struct nfs_client, cl_share_link);
1273
1274 /* Check if the client is initialized */
1275 if (clp->cl_cons_state != NFS_CS_READY)
1276 return 0;
1277
1278 rcu_read_lock();
1279 seq_printf(m, "v%u %s %s %3d %s\n",
1280 clp->rpc_ops->version,
1281 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1282 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1283 refcount_read(&clp->cl_count),
1284 clp->cl_hostname);
1285 rcu_read_unlock();
1286
1287 return 0;
1288}
1289
1290/*
1291 * set up the iterator to start reading from the volume list and return the first item
1292 */
1293static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1294 __acquires(&nn->nfs_client_lock)
1295{
1296 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1297
1298 /* lock the list against modification */
1299 spin_lock(&nn->nfs_client_lock);
1300 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1301}
1302
1303/*
1304 * move to next volume
1305 */
1306static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1307{
1308 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1309
1310 return seq_list_next(v, &nn->nfs_volume_list, pos);
1311}
1312
1313/*
1314 * clean up after reading from the transports list
1315 */
1316static void nfs_volume_list_stop(struct seq_file *p, void *v)
1317 __releases(&nn->nfs_client_lock)
1318{
1319 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1320
1321 spin_unlock(&nn->nfs_client_lock);
1322}
1323
1324/*
1325 * display a header line followed by a load of call lines
1326 */
1327static int nfs_volume_list_show(struct seq_file *m, void *v)
1328{
1329 struct nfs_server *server;
1330 struct nfs_client *clp;
1331 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1332 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1333 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1334
1335 /* display header on line 1 */
1336 if (v == &nn->nfs_volume_list) {
1337 seq_puts(m, "NV SERVER PORT DEV FSID"
1338 " FSC\n");
1339 return 0;
1340 }
1341 /* display one transport per line on subsequent lines */
1342 server = list_entry(v, struct nfs_server, master_link);
1343 clp = server->nfs_client;
1344
1345 snprintf(dev, sizeof(dev), "%u:%u",
1346 MAJOR(server->s_dev), MINOR(server->s_dev));
1347
1348 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1349 (unsigned long long) server->fsid.major,
1350 (unsigned long long) server->fsid.minor);
1351
1352 rcu_read_lock();
1353 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1354 clp->rpc_ops->version,
1355 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1356 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1357 dev,
1358 fsid,
1359 nfs_server_fscache_state(server));
1360 rcu_read_unlock();
1361
1362 return 0;
1363}
1364
1365int nfs_fs_proc_net_init(struct net *net)
1366{
1367 struct nfs_net *nn = net_generic(net, nfs_net_id);
1368 struct proc_dir_entry *p;
1369
1370 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1371 if (!nn->proc_nfsfs)
1372 goto error_0;
1373
1374 /* a file of servers with which we're dealing */
1375 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1376 &nfs_server_list_ops, sizeof(struct seq_net_private));
1377 if (!p)
1378 goto error_1;
1379
1380 /* a file of volumes that we have mounted */
1381 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1382 &nfs_volume_list_ops, sizeof(struct seq_net_private));
1383 if (!p)
1384 goto error_1;
1385 return 0;
1386
1387error_1:
1388 remove_proc_subtree("nfsfs", net->proc_net);
1389error_0:
1390 return -ENOMEM;
1391}
1392
1393void nfs_fs_proc_net_exit(struct net *net)
1394{
1395 remove_proc_subtree("nfsfs", net->proc_net);
1396}
1397
1398/*
1399 * initialise the /proc/fs/nfsfs/ directory
1400 */
1401int __init nfs_fs_proc_init(void)
1402{
1403 if (!proc_mkdir("fs/nfsfs", NULL))
1404 goto error_0;
1405
1406 /* a file of servers with which we're dealing */
1407 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1408 goto error_1;
1409
1410 /* a file of volumes that we have mounted */
1411 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1412 goto error_1;
1413
1414 return 0;
1415error_1:
1416 remove_proc_subtree("fs/nfsfs", NULL);
1417error_0:
1418 return -ENOMEM;
1419}
1420
1421/*
1422 * clean up the /proc/fs/nfsfs/ directory
1423 */
1424void nfs_fs_proc_exit(void)
1425{
1426 remove_proc_subtree("fs/nfsfs", NULL);
1427 ida_destroy(&s_sysfs_ids);
1428}
1429
1430#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 "netns.h"
55
56#define NFSDBG_FACILITY NFSDBG_CLIENT
57
58static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
59#ifdef CONFIG_NFS_V4
60
61/*
62 * Get a unique NFSv4.0 callback identifier which will be used
63 * by the V4.0 callback service to lookup the nfs_client struct
64 */
65static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
66{
67 int ret = 0;
68 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
69
70 if (clp->rpc_ops->version != 4 || minorversion != 0)
71 return ret;
72retry:
73 if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
74 return -ENOMEM;
75 spin_lock(&nn->nfs_client_lock);
76 ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
77 spin_unlock(&nn->nfs_client_lock);
78 if (ret == -EAGAIN)
79 goto retry;
80 return ret;
81}
82#endif /* CONFIG_NFS_V4 */
83
84/*
85 * Turn off NFSv4 uid/gid mapping when using AUTH_SYS
86 */
87static bool nfs4_disable_idmapping = true;
88
89/*
90 * RPC cruft for NFS
91 */
92static const struct rpc_version *nfs_version[5] = {
93#ifdef CONFIG_NFS_V2
94 [2] = &nfs_version2,
95#endif
96#ifdef CONFIG_NFS_V3
97 [3] = &nfs_version3,
98#endif
99#ifdef CONFIG_NFS_V4
100 [4] = &nfs_version4,
101#endif
102};
103
104const struct rpc_program nfs_program = {
105 .name = "nfs",
106 .number = NFS_PROGRAM,
107 .nrvers = ARRAY_SIZE(nfs_version),
108 .version = nfs_version,
109 .stats = &nfs_rpcstat,
110 .pipe_dir_name = NFS_PIPE_DIRNAME,
111};
112
113struct rpc_stat nfs_rpcstat = {
114 .program = &nfs_program
115};
116
117
118#ifdef CONFIG_NFS_V3_ACL
119static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
120static const struct rpc_version *nfsacl_version[] = {
121 [3] = &nfsacl_version3,
122};
123
124const struct rpc_program nfsacl_program = {
125 .name = "nfsacl",
126 .number = NFS_ACL_PROGRAM,
127 .nrvers = ARRAY_SIZE(nfsacl_version),
128 .version = nfsacl_version,
129 .stats = &nfsacl_rpcstat,
130};
131#endif /* CONFIG_NFS_V3_ACL */
132
133struct nfs_client_initdata {
134 unsigned long init_flags;
135 const char *hostname;
136 const struct sockaddr *addr;
137 size_t addrlen;
138 const struct nfs_rpc_ops *rpc_ops;
139 int proto;
140 u32 minorversion;
141 struct net *net;
142};
143
144/*
145 * Allocate a shared client record
146 *
147 * Since these are allocated/deallocated very rarely, we don't
148 * bother putting them in a slab cache...
149 */
150static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
151{
152 struct nfs_client *clp;
153 struct rpc_cred *cred;
154 int err = -ENOMEM;
155
156 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
157 goto error_0;
158
159 clp->rpc_ops = cl_init->rpc_ops;
160
161 atomic_set(&clp->cl_count, 1);
162 clp->cl_cons_state = NFS_CS_INITING;
163
164 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
165 clp->cl_addrlen = cl_init->addrlen;
166
167 if (cl_init->hostname) {
168 err = -ENOMEM;
169 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
170 if (!clp->cl_hostname)
171 goto error_cleanup;
172 }
173
174 INIT_LIST_HEAD(&clp->cl_superblocks);
175 clp->cl_rpcclient = ERR_PTR(-EINVAL);
176
177 clp->cl_proto = cl_init->proto;
178 clp->cl_net = get_net(cl_init->net);
179
180#ifdef CONFIG_NFS_V4
181 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
182 if (err)
183 goto error_cleanup;
184
185 spin_lock_init(&clp->cl_lock);
186 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
187 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
188 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
189 clp->cl_minorversion = cl_init->minorversion;
190 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
191#endif
192 cred = rpc_lookup_machine_cred("*");
193 if (!IS_ERR(cred))
194 clp->cl_machine_cred = cred;
195 nfs_fscache_get_client_cookie(clp);
196
197 return clp;
198
199error_cleanup:
200 kfree(clp);
201error_0:
202 return ERR_PTR(err);
203}
204
205#ifdef CONFIG_NFS_V4
206#ifdef CONFIG_NFS_V4_1
207static void nfs4_shutdown_session(struct nfs_client *clp)
208{
209 if (nfs4_has_session(clp)) {
210 nfs4_destroy_session(clp->cl_session);
211 nfs4_destroy_clientid(clp);
212 }
213
214}
215#else /* CONFIG_NFS_V4_1 */
216static void nfs4_shutdown_session(struct nfs_client *clp)
217{
218}
219#endif /* CONFIG_NFS_V4_1 */
220
221/*
222 * Destroy the NFS4 callback service
223 */
224static void nfs4_destroy_callback(struct nfs_client *clp)
225{
226 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
227 nfs_callback_down(clp->cl_mvops->minor_version);
228}
229
230static void nfs4_shutdown_client(struct nfs_client *clp)
231{
232 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
233 nfs4_kill_renewd(clp);
234 nfs4_shutdown_session(clp);
235 nfs4_destroy_callback(clp);
236 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
237 nfs_idmap_delete(clp);
238
239 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
240 kfree(clp->cl_serverowner);
241 kfree(clp->cl_serverscope);
242 kfree(clp->cl_implid);
243}
244
245/* idr_remove_all is not needed as all id's are removed by nfs_put_client */
246void nfs_cleanup_cb_ident_idr(struct net *net)
247{
248 struct nfs_net *nn = net_generic(net, nfs_net_id);
249
250 idr_destroy(&nn->cb_ident_idr);
251}
252
253/* nfs_client_lock held */
254static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
255{
256 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
257
258 if (clp->cl_cb_ident)
259 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
260}
261
262static void pnfs_init_server(struct nfs_server *server)
263{
264 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
265}
266
267static void nfs4_destroy_server(struct nfs_server *server)
268{
269 nfs4_purge_state_owners(server);
270}
271
272#else
273static void nfs4_shutdown_client(struct nfs_client *clp)
274{
275}
276
277void nfs_cleanup_cb_ident_idr(struct net *net)
278{
279}
280
281static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
282{
283}
284
285static void pnfs_init_server(struct nfs_server *server)
286{
287}
288
289#endif /* CONFIG_NFS_V4 */
290
291/*
292 * Destroy a shared client record
293 */
294static void nfs_free_client(struct nfs_client *clp)
295{
296 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
297
298 nfs4_shutdown_client(clp);
299
300 nfs_fscache_release_client_cookie(clp);
301
302 /* -EIO all pending I/O */
303 if (!IS_ERR(clp->cl_rpcclient))
304 rpc_shutdown_client(clp->cl_rpcclient);
305
306 if (clp->cl_machine_cred != NULL)
307 put_rpccred(clp->cl_machine_cred);
308
309 put_net(clp->cl_net);
310 kfree(clp->cl_hostname);
311 kfree(clp);
312
313 dprintk("<-- nfs_free_client()\n");
314}
315
316/*
317 * Release a reference to a shared client record
318 */
319void nfs_put_client(struct nfs_client *clp)
320{
321 struct nfs_net *nn;
322
323 if (!clp)
324 return;
325
326 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
327 nn = net_generic(clp->cl_net, nfs_net_id);
328
329 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
330 list_del(&clp->cl_share_link);
331 nfs_cb_idr_remove_locked(clp);
332 spin_unlock(&nn->nfs_client_lock);
333
334 BUG_ON(!list_empty(&clp->cl_superblocks));
335
336 nfs_free_client(clp);
337 }
338}
339EXPORT_SYMBOL_GPL(nfs_put_client);
340
341#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
342/*
343 * Test if two ip6 socket addresses refer to the same socket by
344 * comparing relevant fields. The padding bytes specifically, are not
345 * compared. sin6_flowinfo is not compared because it only affects QoS
346 * and sin6_scope_id is only compared if the address is "link local"
347 * because "link local" addresses need only be unique to a specific
348 * link. Conversely, ordinary unicast addresses might have different
349 * sin6_scope_id.
350 *
351 * The caller should ensure both socket addresses are AF_INET6.
352 */
353static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
354 const struct sockaddr *sa2)
355{
356 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
357 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
358
359 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
360 return 0;
361 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
362 return sin1->sin6_scope_id == sin2->sin6_scope_id;
363
364 return 1;
365}
366#else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
367static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
368 const struct sockaddr *sa2)
369{
370 return 0;
371}
372#endif
373
374/*
375 * Test if two ip4 socket addresses refer to the same socket, by
376 * comparing relevant fields. The padding bytes specifically, are
377 * not compared.
378 *
379 * The caller should ensure both socket addresses are AF_INET.
380 */
381static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
382 const struct sockaddr *sa2)
383{
384 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
385 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
386
387 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
388}
389
390static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
391 const struct sockaddr *sa2)
392{
393 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
394 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
395
396 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
397 (sin1->sin6_port == sin2->sin6_port);
398}
399
400static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
401 const struct sockaddr *sa2)
402{
403 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
404 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
405
406 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
407 (sin1->sin_port == sin2->sin_port);
408}
409
410#if defined(CONFIG_NFS_V4_1)
411/*
412 * Test if two socket addresses represent the same actual socket,
413 * by comparing (only) relevant fields, excluding the port number.
414 */
415static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
416 const struct sockaddr *sa2)
417{
418 if (sa1->sa_family != sa2->sa_family)
419 return 0;
420
421 switch (sa1->sa_family) {
422 case AF_INET:
423 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
424 case AF_INET6:
425 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
426 }
427 return 0;
428}
429#endif /* CONFIG_NFS_V4_1 */
430
431/*
432 * Test if two socket addresses represent the same actual socket,
433 * by comparing (only) relevant fields, including the port number.
434 */
435static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
436 const struct sockaddr *sa2)
437{
438 if (sa1->sa_family != sa2->sa_family)
439 return 0;
440
441 switch (sa1->sa_family) {
442 case AF_INET:
443 return nfs_sockaddr_cmp_ip4(sa1, sa2);
444 case AF_INET6:
445 return nfs_sockaddr_cmp_ip6(sa1, sa2);
446 }
447 return 0;
448}
449
450#if defined(CONFIG_NFS_V4_1)
451/* Common match routine for v4.0 and v4.1 callback services */
452static bool nfs4_cb_match_client(const struct sockaddr *addr,
453 struct nfs_client *clp, u32 minorversion)
454{
455 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
456
457 /* Don't match clients that failed to initialise */
458 if (!(clp->cl_cons_state == NFS_CS_READY ||
459 clp->cl_cons_state == NFS_CS_SESSION_INITING))
460 return false;
461
462 smp_rmb();
463
464 /* Match the version and minorversion */
465 if (clp->rpc_ops->version != 4 ||
466 clp->cl_minorversion != minorversion)
467 return false;
468
469 /* Match only the IP address, not the port number */
470 if (!nfs_sockaddr_match_ipaddr(addr, clap))
471 return false;
472
473 return true;
474}
475#endif /* CONFIG_NFS_V4_1 */
476
477/*
478 * Find an nfs_client on the list that matches the initialisation data
479 * that is supplied.
480 */
481static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
482{
483 struct nfs_client *clp;
484 const struct sockaddr *sap = data->addr;
485 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
486
487 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
488 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
489 /* Don't match clients that failed to initialise properly */
490 if (clp->cl_cons_state < 0)
491 continue;
492
493 /* Different NFS versions cannot share the same nfs_client */
494 if (clp->rpc_ops != data->rpc_ops)
495 continue;
496
497 if (clp->cl_proto != data->proto)
498 continue;
499 /* Match nfsv4 minorversion */
500 if (clp->cl_minorversion != data->minorversion)
501 continue;
502 /* Match the full socket address */
503 if (!nfs_sockaddr_cmp(sap, clap))
504 continue;
505
506 atomic_inc(&clp->cl_count);
507 return clp;
508 }
509 return NULL;
510}
511
512static bool nfs_client_init_is_complete(const struct nfs_client *clp)
513{
514 return clp->cl_cons_state != NFS_CS_INITING;
515}
516
517int nfs_wait_client_init_complete(const struct nfs_client *clp)
518{
519 return wait_event_killable(nfs_client_active_wq,
520 nfs_client_init_is_complete(clp));
521}
522
523/*
524 * Found an existing client. Make sure it's ready before returning.
525 */
526static struct nfs_client *
527nfs_found_client(const struct nfs_client_initdata *cl_init,
528 struct nfs_client *clp)
529{
530 int error;
531
532 error = nfs_wait_client_init_complete(clp);
533 if (error < 0) {
534 nfs_put_client(clp);
535 return ERR_PTR(-ERESTARTSYS);
536 }
537
538 if (clp->cl_cons_state < NFS_CS_READY) {
539 error = clp->cl_cons_state;
540 nfs_put_client(clp);
541 return ERR_PTR(error);
542 }
543
544 smp_rmb();
545
546 dprintk("<-- %s found nfs_client %p for %s\n",
547 __func__, clp, cl_init->hostname ?: "");
548 return clp;
549}
550
551/*
552 * Look up a client by IP address and protocol version
553 * - creates a new record if one doesn't yet exist
554 */
555static struct nfs_client *
556nfs_get_client(const struct nfs_client_initdata *cl_init,
557 const struct rpc_timeout *timeparms,
558 const char *ip_addr,
559 rpc_authflavor_t authflavour)
560{
561 struct nfs_client *clp, *new = NULL;
562 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
563
564 dprintk("--> nfs_get_client(%s,v%u)\n",
565 cl_init->hostname ?: "", cl_init->rpc_ops->version);
566
567 /* see if the client already exists */
568 do {
569 spin_lock(&nn->nfs_client_lock);
570
571 clp = nfs_match_client(cl_init);
572 if (clp) {
573 spin_unlock(&nn->nfs_client_lock);
574 if (new)
575 nfs_free_client(new);
576 return nfs_found_client(cl_init, clp);
577 }
578 if (new) {
579 list_add(&new->cl_share_link, &nn->nfs_client_list);
580 spin_unlock(&nn->nfs_client_lock);
581 new->cl_flags = cl_init->init_flags;
582 return cl_init->rpc_ops->init_client(new,
583 timeparms, ip_addr,
584 authflavour);
585 }
586
587 spin_unlock(&nn->nfs_client_lock);
588
589 new = nfs_alloc_client(cl_init);
590 } while (!IS_ERR(new));
591
592 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
593 cl_init->hostname ?: "", PTR_ERR(new));
594 return new;
595}
596
597/*
598 * Mark a server as ready or failed
599 */
600void nfs_mark_client_ready(struct nfs_client *clp, int state)
601{
602 smp_wmb();
603 clp->cl_cons_state = state;
604 wake_up_all(&nfs_client_active_wq);
605}
606
607/*
608 * Initialise the timeout values for a connection
609 */
610static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
611 unsigned int timeo, unsigned int retrans)
612{
613 to->to_initval = timeo * HZ / 10;
614 to->to_retries = retrans;
615
616 switch (proto) {
617 case XPRT_TRANSPORT_TCP:
618 case XPRT_TRANSPORT_RDMA:
619 if (to->to_retries == 0)
620 to->to_retries = NFS_DEF_TCP_RETRANS;
621 if (to->to_initval == 0)
622 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
623 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
624 to->to_initval = NFS_MAX_TCP_TIMEOUT;
625 to->to_increment = to->to_initval;
626 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
627 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
628 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
629 if (to->to_maxval < to->to_initval)
630 to->to_maxval = to->to_initval;
631 to->to_exponential = 0;
632 break;
633 case XPRT_TRANSPORT_UDP:
634 if (to->to_retries == 0)
635 to->to_retries = NFS_DEF_UDP_RETRANS;
636 if (!to->to_initval)
637 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
638 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
639 to->to_initval = NFS_MAX_UDP_TIMEOUT;
640 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
641 to->to_exponential = 1;
642 break;
643 default:
644 BUG();
645 }
646}
647
648/*
649 * Create an RPC client handle
650 */
651static int nfs_create_rpc_client(struct nfs_client *clp,
652 const struct rpc_timeout *timeparms,
653 rpc_authflavor_t flavor)
654{
655 struct rpc_clnt *clnt = NULL;
656 struct rpc_create_args args = {
657 .net = clp->cl_net,
658 .protocol = clp->cl_proto,
659 .address = (struct sockaddr *)&clp->cl_addr,
660 .addrsize = clp->cl_addrlen,
661 .timeout = timeparms,
662 .servername = clp->cl_hostname,
663 .program = &nfs_program,
664 .version = clp->rpc_ops->version,
665 .authflavor = flavor,
666 };
667
668 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
669 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
670 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
671 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
672
673 if (!IS_ERR(clp->cl_rpcclient))
674 return 0;
675
676 clnt = rpc_create(&args);
677 if (IS_ERR(clnt)) {
678 dprintk("%s: cannot create RPC client. Error = %ld\n",
679 __func__, PTR_ERR(clnt));
680 return PTR_ERR(clnt);
681 }
682
683 clp->cl_rpcclient = clnt;
684 return 0;
685}
686
687/*
688 * Version 2 or 3 client destruction
689 */
690static void nfs_destroy_server(struct nfs_server *server)
691{
692 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
693 !(server->flags & NFS_MOUNT_LOCAL_FCNTL))
694 nlmclnt_done(server->nlm_host);
695}
696
697/*
698 * Version 2 or 3 lockd setup
699 */
700static int nfs_start_lockd(struct nfs_server *server)
701{
702 struct nlm_host *host;
703 struct nfs_client *clp = server->nfs_client;
704 struct nlmclnt_initdata nlm_init = {
705 .hostname = clp->cl_hostname,
706 .address = (struct sockaddr *)&clp->cl_addr,
707 .addrlen = clp->cl_addrlen,
708 .nfs_version = clp->rpc_ops->version,
709 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
710 1 : 0,
711 .net = clp->cl_net,
712 };
713
714 if (nlm_init.nfs_version > 3)
715 return 0;
716 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
717 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
718 return 0;
719
720 switch (clp->cl_proto) {
721 default:
722 nlm_init.protocol = IPPROTO_TCP;
723 break;
724 case XPRT_TRANSPORT_UDP:
725 nlm_init.protocol = IPPROTO_UDP;
726 }
727
728 host = nlmclnt_init(&nlm_init);
729 if (IS_ERR(host))
730 return PTR_ERR(host);
731
732 server->nlm_host = host;
733 server->destroy = nfs_destroy_server;
734 return 0;
735}
736
737/*
738 * Initialise an NFSv3 ACL client connection
739 */
740#ifdef CONFIG_NFS_V3_ACL
741static void nfs_init_server_aclclient(struct nfs_server *server)
742{
743 if (server->nfs_client->rpc_ops->version != 3)
744 goto out_noacl;
745 if (server->flags & NFS_MOUNT_NOACL)
746 goto out_noacl;
747
748 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
749 if (IS_ERR(server->client_acl))
750 goto out_noacl;
751
752 /* No errors! Assume that Sun nfsacls are supported */
753 server->caps |= NFS_CAP_ACLS;
754 return;
755
756out_noacl:
757 server->caps &= ~NFS_CAP_ACLS;
758}
759#else
760static inline void nfs_init_server_aclclient(struct nfs_server *server)
761{
762 server->flags &= ~NFS_MOUNT_NOACL;
763 server->caps &= ~NFS_CAP_ACLS;
764}
765#endif
766
767/*
768 * Create a general RPC client
769 */
770static int nfs_init_server_rpcclient(struct nfs_server *server,
771 const struct rpc_timeout *timeo,
772 rpc_authflavor_t pseudoflavour)
773{
774 struct nfs_client *clp = server->nfs_client;
775
776 server->client = rpc_clone_client(clp->cl_rpcclient);
777 if (IS_ERR(server->client)) {
778 dprintk("%s: couldn't create rpc_client!\n", __func__);
779 return PTR_ERR(server->client);
780 }
781
782 memcpy(&server->client->cl_timeout_default,
783 timeo,
784 sizeof(server->client->cl_timeout_default));
785 server->client->cl_timeout = &server->client->cl_timeout_default;
786
787 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
788 struct rpc_auth *auth;
789
790 auth = rpcauth_create(pseudoflavour, server->client);
791 if (IS_ERR(auth)) {
792 dprintk("%s: couldn't create credcache!\n", __func__);
793 return PTR_ERR(auth);
794 }
795 }
796 server->client->cl_softrtry = 0;
797 if (server->flags & NFS_MOUNT_SOFT)
798 server->client->cl_softrtry = 1;
799
800 return 0;
801}
802
803/**
804 * nfs_init_client - Initialise an NFS2 or NFS3 client
805 *
806 * @clp: nfs_client to initialise
807 * @timeparms: timeout parameters for underlying RPC transport
808 * @ip_addr: IP presentation address (not used)
809 * @authflavor: authentication flavor for underlying RPC transport
810 *
811 * Returns pointer to an NFS client, or an ERR_PTR value.
812 */
813struct nfs_client *nfs_init_client(struct nfs_client *clp,
814 const struct rpc_timeout *timeparms,
815 const char *ip_addr, rpc_authflavor_t authflavour)
816{
817 int error;
818
819 if (clp->cl_cons_state == NFS_CS_READY) {
820 /* the client is already initialised */
821 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
822 return clp;
823 }
824
825 /*
826 * Create a client RPC handle for doing FSSTAT with UNIX auth only
827 * - RFC 2623, sec 2.3.2
828 */
829 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
830 if (error < 0)
831 goto error;
832 nfs_mark_client_ready(clp, NFS_CS_READY);
833 return clp;
834
835error:
836 nfs_mark_client_ready(clp, error);
837 nfs_put_client(clp);
838 dprintk("<-- nfs_init_client() = xerror %d\n", error);
839 return ERR_PTR(error);
840}
841
842/*
843 * Create a version 2 or 3 client
844 */
845static int nfs_init_server(struct nfs_server *server,
846 const struct nfs_parsed_mount_data *data)
847{
848 struct nfs_client_initdata cl_init = {
849 .hostname = data->nfs_server.hostname,
850 .addr = (const struct sockaddr *)&data->nfs_server.address,
851 .addrlen = data->nfs_server.addrlen,
852 .rpc_ops = NULL,
853 .proto = data->nfs_server.protocol,
854 .net = data->net,
855 };
856 struct rpc_timeout timeparms;
857 struct nfs_client *clp;
858 int error;
859
860 dprintk("--> nfs_init_server()\n");
861
862 switch (data->version) {
863#ifdef CONFIG_NFS_V2
864 case 2:
865 cl_init.rpc_ops = &nfs_v2_clientops;
866 break;
867#endif
868#ifdef CONFIG_NFS_V3
869 case 3:
870 cl_init.rpc_ops = &nfs_v3_clientops;
871 break;
872#endif
873 default:
874 return -EPROTONOSUPPORT;
875 }
876
877 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
878 data->timeo, data->retrans);
879 if (data->flags & NFS_MOUNT_NORESVPORT)
880 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
881
882 /* Allocate or find a client reference we can use */
883 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX);
884 if (IS_ERR(clp)) {
885 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
886 return PTR_ERR(clp);
887 }
888
889 server->nfs_client = clp;
890
891 /* Initialise the client representation from the mount data */
892 server->flags = data->flags;
893 server->options = data->options;
894 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
895 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
896 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR;
897
898 if (data->rsize)
899 server->rsize = nfs_block_size(data->rsize, NULL);
900 if (data->wsize)
901 server->wsize = nfs_block_size(data->wsize, NULL);
902
903 server->acregmin = data->acregmin * HZ;
904 server->acregmax = data->acregmax * HZ;
905 server->acdirmin = data->acdirmin * HZ;
906 server->acdirmax = data->acdirmax * HZ;
907
908 /* Start lockd here, before we might error out */
909 error = nfs_start_lockd(server);
910 if (error < 0)
911 goto error;
912
913 server->port = data->nfs_server.port;
914
915 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
916 if (error < 0)
917 goto error;
918
919 /* Preserve the values of mount_server-related mount options */
920 if (data->mount_server.addrlen) {
921 memcpy(&server->mountd_address, &data->mount_server.address,
922 data->mount_server.addrlen);
923 server->mountd_addrlen = data->mount_server.addrlen;
924 }
925 server->mountd_version = data->mount_server.version;
926 server->mountd_port = data->mount_server.port;
927 server->mountd_protocol = data->mount_server.protocol;
928
929 server->namelen = data->namlen;
930 /* Create a client RPC handle for the NFSv3 ACL management interface */
931 nfs_init_server_aclclient(server);
932 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
933 return 0;
934
935error:
936 server->nfs_client = NULL;
937 nfs_put_client(clp);
938 dprintk("<-- nfs_init_server() = xerror %d\n", error);
939 return error;
940}
941
942/*
943 * Load up the server record from information gained in an fsinfo record
944 */
945static void nfs_server_set_fsinfo(struct nfs_server *server,
946 struct nfs_fh *mntfh,
947 struct nfs_fsinfo *fsinfo)
948{
949 unsigned long max_rpc_payload;
950
951 /* Work out a lot of parameters */
952 if (server->rsize == 0)
953 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
954 if (server->wsize == 0)
955 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
956
957 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
958 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
959 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
960 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
961
962 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
963 if (server->rsize > max_rpc_payload)
964 server->rsize = max_rpc_payload;
965 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
966 server->rsize = NFS_MAX_FILE_IO_SIZE;
967 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
968
969 server->backing_dev_info.name = "nfs";
970 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
971
972 if (server->wsize > max_rpc_payload)
973 server->wsize = max_rpc_payload;
974 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
975 server->wsize = NFS_MAX_FILE_IO_SIZE;
976 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
977 server->pnfs_blksize = fsinfo->blksize;
978 set_pnfs_layoutdriver(server, mntfh, fsinfo->layouttype);
979
980 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
981
982 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
983 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
984 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
985 if (server->dtsize > server->rsize)
986 server->dtsize = server->rsize;
987
988 if (server->flags & NFS_MOUNT_NOAC) {
989 server->acregmin = server->acregmax = 0;
990 server->acdirmin = server->acdirmax = 0;
991 }
992
993 server->maxfilesize = fsinfo->maxfilesize;
994
995 server->time_delta = fsinfo->time_delta;
996
997 /* We're airborne Set socket buffersize */
998 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
999}
1000
1001/*
1002 * Probe filesystem information, including the FSID on v2/v3
1003 */
1004static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
1005{
1006 struct nfs_fsinfo fsinfo;
1007 struct nfs_client *clp = server->nfs_client;
1008 int error;
1009
1010 dprintk("--> nfs_probe_fsinfo()\n");
1011
1012 if (clp->rpc_ops->set_capabilities != NULL) {
1013 error = clp->rpc_ops->set_capabilities(server, mntfh);
1014 if (error < 0)
1015 goto out_error;
1016 }
1017
1018 fsinfo.fattr = fattr;
1019 fsinfo.layouttype = 0;
1020 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
1021 if (error < 0)
1022 goto out_error;
1023
1024 nfs_server_set_fsinfo(server, mntfh, &fsinfo);
1025
1026 /* Get some general file system info */
1027 if (server->namelen == 0) {
1028 struct nfs_pathconf pathinfo;
1029
1030 pathinfo.fattr = fattr;
1031 nfs_fattr_init(fattr);
1032
1033 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
1034 server->namelen = pathinfo.max_namelen;
1035 }
1036
1037 dprintk("<-- nfs_probe_fsinfo() = 0\n");
1038 return 0;
1039
1040out_error:
1041 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
1042 return error;
1043}
1044
1045/*
1046 * Copy useful information when duplicating a server record
1047 */
1048static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
1049{
1050 target->flags = source->flags;
1051 target->rsize = source->rsize;
1052 target->wsize = source->wsize;
1053 target->acregmin = source->acregmin;
1054 target->acregmax = source->acregmax;
1055 target->acdirmin = source->acdirmin;
1056 target->acdirmax = source->acdirmax;
1057 target->caps = source->caps;
1058 target->options = source->options;
1059}
1060
1061static void nfs_server_insert_lists(struct nfs_server *server)
1062{
1063 struct nfs_client *clp = server->nfs_client;
1064 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1065
1066 spin_lock(&nn->nfs_client_lock);
1067 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
1068 list_add_tail(&server->master_link, &nn->nfs_volume_list);
1069 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1070 spin_unlock(&nn->nfs_client_lock);
1071
1072}
1073
1074static void nfs_server_remove_lists(struct nfs_server *server)
1075{
1076 struct nfs_client *clp = server->nfs_client;
1077 struct nfs_net *nn;
1078
1079 if (clp == NULL)
1080 return;
1081 nn = net_generic(clp->cl_net, nfs_net_id);
1082 spin_lock(&nn->nfs_client_lock);
1083 list_del_rcu(&server->client_link);
1084 if (list_empty(&clp->cl_superblocks))
1085 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1086 list_del(&server->master_link);
1087 spin_unlock(&nn->nfs_client_lock);
1088
1089 synchronize_rcu();
1090}
1091
1092/*
1093 * Allocate and initialise a server record
1094 */
1095static struct nfs_server *nfs_alloc_server(void)
1096{
1097 struct nfs_server *server;
1098
1099 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1100 if (!server)
1101 return NULL;
1102
1103 server->client = server->client_acl = ERR_PTR(-EINVAL);
1104
1105 /* Zero out the NFS state stuff */
1106 INIT_LIST_HEAD(&server->client_link);
1107 INIT_LIST_HEAD(&server->master_link);
1108 INIT_LIST_HEAD(&server->delegations);
1109 INIT_LIST_HEAD(&server->layouts);
1110 INIT_LIST_HEAD(&server->state_owners_lru);
1111
1112 atomic_set(&server->active, 0);
1113
1114 server->io_stats = nfs_alloc_iostats();
1115 if (!server->io_stats) {
1116 kfree(server);
1117 return NULL;
1118 }
1119
1120 if (bdi_init(&server->backing_dev_info)) {
1121 nfs_free_iostats(server->io_stats);
1122 kfree(server);
1123 return NULL;
1124 }
1125
1126 ida_init(&server->openowner_id);
1127 ida_init(&server->lockowner_id);
1128 pnfs_init_server(server);
1129
1130 return server;
1131}
1132
1133/*
1134 * Free up a server record
1135 */
1136void nfs_free_server(struct nfs_server *server)
1137{
1138 dprintk("--> nfs_free_server()\n");
1139
1140 nfs_server_remove_lists(server);
1141 unset_pnfs_layoutdriver(server);
1142
1143 if (server->destroy != NULL)
1144 server->destroy(server);
1145
1146 if (!IS_ERR(server->client_acl))
1147 rpc_shutdown_client(server->client_acl);
1148 if (!IS_ERR(server->client))
1149 rpc_shutdown_client(server->client);
1150
1151 nfs_put_client(server->nfs_client);
1152
1153 ida_destroy(&server->lockowner_id);
1154 ida_destroy(&server->openowner_id);
1155 nfs_free_iostats(server->io_stats);
1156 bdi_destroy(&server->backing_dev_info);
1157 kfree(server);
1158 nfs_release_automount_timer();
1159 dprintk("<-- nfs_free_server()\n");
1160}
1161
1162/*
1163 * Create a version 2 or 3 volume record
1164 * - keyed on server and FSID
1165 */
1166struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1167 struct nfs_fh *mntfh)
1168{
1169 struct nfs_server *server;
1170 struct nfs_fattr *fattr;
1171 int error;
1172
1173 server = nfs_alloc_server();
1174 if (!server)
1175 return ERR_PTR(-ENOMEM);
1176
1177 error = -ENOMEM;
1178 fattr = nfs_alloc_fattr();
1179 if (fattr == NULL)
1180 goto error;
1181
1182 /* Get a client representation */
1183 error = nfs_init_server(server, data);
1184 if (error < 0)
1185 goto error;
1186
1187 BUG_ON(!server->nfs_client);
1188 BUG_ON(!server->nfs_client->rpc_ops);
1189 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1190
1191 /* Probe the root fh to retrieve its FSID */
1192 error = nfs_probe_fsinfo(server, mntfh, fattr);
1193 if (error < 0)
1194 goto error;
1195 if (server->nfs_client->rpc_ops->version == 3) {
1196 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1197 server->namelen = NFS3_MAXNAMLEN;
1198 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1199 server->caps |= NFS_CAP_READDIRPLUS;
1200 } else {
1201 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1202 server->namelen = NFS2_MAXNAMLEN;
1203 }
1204
1205 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1206 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1207 if (error < 0) {
1208 dprintk("nfs_create_server: getattr error = %d\n", -error);
1209 goto error;
1210 }
1211 }
1212 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1213
1214 dprintk("Server FSID: %llx:%llx\n",
1215 (unsigned long long) server->fsid.major,
1216 (unsigned long long) server->fsid.minor);
1217
1218 nfs_server_insert_lists(server);
1219 server->mount_time = jiffies;
1220 nfs_free_fattr(fattr);
1221 return server;
1222
1223error:
1224 nfs_free_fattr(fattr);
1225 nfs_free_server(server);
1226 return ERR_PTR(error);
1227}
1228
1229#ifdef CONFIG_NFS_V4
1230/*
1231 * NFSv4.0 callback thread helper
1232 *
1233 * Find a client by callback identifier
1234 */
1235struct nfs_client *
1236nfs4_find_client_ident(struct net *net, int cb_ident)
1237{
1238 struct nfs_client *clp;
1239 struct nfs_net *nn = net_generic(net, nfs_net_id);
1240
1241 spin_lock(&nn->nfs_client_lock);
1242 clp = idr_find(&nn->cb_ident_idr, cb_ident);
1243 if (clp)
1244 atomic_inc(&clp->cl_count);
1245 spin_unlock(&nn->nfs_client_lock);
1246 return clp;
1247}
1248
1249#if defined(CONFIG_NFS_V4_1)
1250/*
1251 * NFSv4.1 callback thread helper
1252 * For CB_COMPOUND calls, find a client by IP address, protocol version,
1253 * minorversion, and sessionID
1254 *
1255 * Returns NULL if no such client
1256 */
1257struct nfs_client *
1258nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
1259 struct nfs4_sessionid *sid)
1260{
1261 struct nfs_client *clp;
1262 struct nfs_net *nn = net_generic(net, nfs_net_id);
1263
1264 spin_lock(&nn->nfs_client_lock);
1265 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
1266 if (nfs4_cb_match_client(addr, clp, 1) == false)
1267 continue;
1268
1269 if (!nfs4_has_session(clp))
1270 continue;
1271
1272 /* Match sessionid*/
1273 if (memcmp(clp->cl_session->sess_id.data,
1274 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
1275 continue;
1276
1277 atomic_inc(&clp->cl_count);
1278 spin_unlock(&nn->nfs_client_lock);
1279 return clp;
1280 }
1281 spin_unlock(&nn->nfs_client_lock);
1282 return NULL;
1283}
1284
1285#else /* CONFIG_NFS_V4_1 */
1286
1287struct nfs_client *
1288nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
1289 struct nfs4_sessionid *sid)
1290{
1291 return NULL;
1292}
1293#endif /* CONFIG_NFS_V4_1 */
1294
1295/*
1296 * Initialize the NFS4 callback service
1297 */
1298static int nfs4_init_callback(struct nfs_client *clp)
1299{
1300 int error;
1301
1302 if (clp->rpc_ops->version == 4) {
1303 struct rpc_xprt *xprt;
1304
1305 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
1306
1307 if (nfs4_has_session(clp)) {
1308 error = xprt_setup_backchannel(xprt,
1309 NFS41_BC_MIN_CALLBACKS);
1310 if (error < 0)
1311 return error;
1312 }
1313
1314 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
1315 if (error < 0) {
1316 dprintk("%s: failed to start callback. Error = %d\n",
1317 __func__, error);
1318 return error;
1319 }
1320 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1321 }
1322 return 0;
1323}
1324
1325/*
1326 * Initialize the minor version specific parts of an NFS4 client record
1327 */
1328static int nfs4_init_client_minor_version(struct nfs_client *clp)
1329{
1330#if defined(CONFIG_NFS_V4_1)
1331 if (clp->cl_mvops->minor_version) {
1332 struct nfs4_session *session = NULL;
1333 /*
1334 * Create the session and mark it expired.
1335 * When a SEQUENCE operation encounters the expired session
1336 * it will do session recovery to initialize it.
1337 */
1338 session = nfs4_alloc_session(clp);
1339 if (!session)
1340 return -ENOMEM;
1341
1342 clp->cl_session = session;
1343 /*
1344 * The create session reply races with the server back
1345 * channel probe. Mark the client NFS_CS_SESSION_INITING
1346 * so that the client back channel can find the
1347 * nfs_client struct
1348 */
1349 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
1350 }
1351#endif /* CONFIG_NFS_V4_1 */
1352
1353 return nfs4_init_callback(clp);
1354}
1355
1356/**
1357 * nfs4_init_client - Initialise an NFS4 client record
1358 *
1359 * @clp: nfs_client to initialise
1360 * @timeparms: timeout parameters for underlying RPC transport
1361 * @ip_addr: callback IP address in presentation format
1362 * @authflavor: authentication flavor for underlying RPC transport
1363 *
1364 * Returns pointer to an NFS client, or an ERR_PTR value.
1365 */
1366struct nfs_client *nfs4_init_client(struct nfs_client *clp,
1367 const struct rpc_timeout *timeparms,
1368 const char *ip_addr,
1369 rpc_authflavor_t authflavour)
1370{
1371 char buf[INET6_ADDRSTRLEN + 1];
1372 int error;
1373
1374 if (clp->cl_cons_state == NFS_CS_READY) {
1375 /* the client is initialised already */
1376 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1377 return clp;
1378 }
1379
1380 /* Check NFS protocol revision and initialize RPC op vector */
1381 clp->rpc_ops = &nfs_v4_clientops;
1382
1383 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
1384 error = nfs_create_rpc_client(clp, timeparms, authflavour);
1385 if (error < 0)
1386 goto error;
1387
1388 /* If no clientaddr= option was specified, find a usable cb address */
1389 if (ip_addr == NULL) {
1390 struct sockaddr_storage cb_addr;
1391 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
1392
1393 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
1394 if (error < 0)
1395 goto error;
1396 error = rpc_ntop(sap, buf, sizeof(buf));
1397 if (error < 0)
1398 goto error;
1399 ip_addr = (const char *)buf;
1400 }
1401 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1402
1403 error = nfs_idmap_new(clp);
1404 if (error < 0) {
1405 dprintk("%s: failed to create idmapper. Error = %d\n",
1406 __func__, error);
1407 goto error;
1408 }
1409 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1410
1411 error = nfs4_init_client_minor_version(clp);
1412 if (error < 0)
1413 goto error;
1414
1415 if (!nfs4_has_session(clp))
1416 nfs_mark_client_ready(clp, NFS_CS_READY);
1417 return clp;
1418
1419error:
1420 nfs_mark_client_ready(clp, error);
1421 nfs_put_client(clp);
1422 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1423 return ERR_PTR(error);
1424}
1425
1426/*
1427 * Set up an NFS4 client
1428 */
1429static int nfs4_set_client(struct nfs_server *server,
1430 const char *hostname,
1431 const struct sockaddr *addr,
1432 const size_t addrlen,
1433 const char *ip_addr,
1434 rpc_authflavor_t authflavour,
1435 int proto, const struct rpc_timeout *timeparms,
1436 u32 minorversion, struct net *net)
1437{
1438 struct nfs_client_initdata cl_init = {
1439 .hostname = hostname,
1440 .addr = addr,
1441 .addrlen = addrlen,
1442 .rpc_ops = &nfs_v4_clientops,
1443 .proto = proto,
1444 .minorversion = minorversion,
1445 .net = net,
1446 };
1447 struct nfs_client *clp;
1448 int error;
1449
1450 dprintk("--> nfs4_set_client()\n");
1451
1452 if (server->flags & NFS_MOUNT_NORESVPORT)
1453 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
1454
1455 /* Allocate or find a client reference we can use */
1456 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
1457 if (IS_ERR(clp)) {
1458 error = PTR_ERR(clp);
1459 goto error;
1460 }
1461
1462 /*
1463 * Query for the lease time on clientid setup or renewal
1464 *
1465 * Note that this will be set on nfs_clients that were created
1466 * only for the DS role and did not set this bit, but now will
1467 * serve a dual role.
1468 */
1469 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
1470
1471 server->nfs_client = clp;
1472 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1473 return 0;
1474error:
1475 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1476 return error;
1477}
1478
1479/*
1480 * Set up a pNFS Data Server client.
1481 *
1482 * Return any existing nfs_client that matches server address,port,version
1483 * and minorversion.
1484 *
1485 * For a new nfs_client, use a soft mount (default), a low retrans and a
1486 * low timeout interval so that if a connection is lost, we retry through
1487 * the MDS.
1488 */
1489struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
1490 const struct sockaddr *ds_addr, int ds_addrlen,
1491 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
1492{
1493 struct nfs_client_initdata cl_init = {
1494 .addr = ds_addr,
1495 .addrlen = ds_addrlen,
1496 .rpc_ops = &nfs_v4_clientops,
1497 .proto = ds_proto,
1498 .minorversion = mds_clp->cl_minorversion,
1499 .net = mds_clp->cl_net,
1500 };
1501 struct rpc_timeout ds_timeout;
1502 struct nfs_client *clp;
1503
1504 /*
1505 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
1506 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
1507 * (section 13.1 RFC 5661).
1508 */
1509 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
1510 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
1511 mds_clp->cl_rpcclient->cl_auth->au_flavor);
1512
1513 dprintk("<-- %s %p\n", __func__, clp);
1514 return clp;
1515}
1516EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
1517
1518/*
1519 * Session has been established, and the client marked ready.
1520 * Set the mount rsize and wsize with negotiated fore channel
1521 * attributes which will be bound checked in nfs_server_set_fsinfo.
1522 */
1523static void nfs4_session_set_rwsize(struct nfs_server *server)
1524{
1525#ifdef CONFIG_NFS_V4_1
1526 struct nfs4_session *sess;
1527 u32 server_resp_sz;
1528 u32 server_rqst_sz;
1529
1530 if (!nfs4_has_session(server->nfs_client))
1531 return;
1532 sess = server->nfs_client->cl_session;
1533 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1534 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1535
1536 if (server->rsize > server_resp_sz)
1537 server->rsize = server_resp_sz;
1538 if (server->wsize > server_rqst_sz)
1539 server->wsize = server_rqst_sz;
1540#endif /* CONFIG_NFS_V4_1 */
1541}
1542
1543static int nfs4_server_common_setup(struct nfs_server *server,
1544 struct nfs_fh *mntfh)
1545{
1546 struct nfs_fattr *fattr;
1547 int error;
1548
1549 BUG_ON(!server->nfs_client);
1550 BUG_ON(!server->nfs_client->rpc_ops);
1551 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1552
1553 /* data servers support only a subset of NFSv4.1 */
1554 if (is_ds_only_client(server->nfs_client))
1555 return -EPROTONOSUPPORT;
1556
1557 fattr = nfs_alloc_fattr();
1558 if (fattr == NULL)
1559 return -ENOMEM;
1560
1561 /* We must ensure the session is initialised first */
1562 error = nfs4_init_session(server);
1563 if (error < 0)
1564 goto out;
1565
1566 /* Probe the root fh to retrieve its FSID and filehandle */
1567 error = nfs4_get_rootfh(server, mntfh);
1568 if (error < 0)
1569 goto out;
1570
1571 dprintk("Server FSID: %llx:%llx\n",
1572 (unsigned long long) server->fsid.major,
1573 (unsigned long long) server->fsid.minor);
1574 dprintk("Mount FH: %d\n", mntfh->size);
1575
1576 nfs4_session_set_rwsize(server);
1577
1578 error = nfs_probe_fsinfo(server, mntfh, fattr);
1579 if (error < 0)
1580 goto out;
1581
1582 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1583 server->namelen = NFS4_MAXNAMLEN;
1584
1585 nfs_server_insert_lists(server);
1586 server->mount_time = jiffies;
1587 server->destroy = nfs4_destroy_server;
1588out:
1589 nfs_free_fattr(fattr);
1590 return error;
1591}
1592
1593/*
1594 * Create a version 4 volume record
1595 */
1596static int nfs4_init_server(struct nfs_server *server,
1597 const struct nfs_parsed_mount_data *data)
1598{
1599 struct rpc_timeout timeparms;
1600 int error;
1601
1602 dprintk("--> nfs4_init_server()\n");
1603
1604 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1605 data->timeo, data->retrans);
1606
1607 /* Initialise the client representation from the mount data */
1608 server->flags = data->flags;
1609 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
1610 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1611 server->caps |= NFS_CAP_READDIRPLUS;
1612 server->options = data->options;
1613
1614 /* Get a client record */
1615 error = nfs4_set_client(server,
1616 data->nfs_server.hostname,
1617 (const struct sockaddr *)&data->nfs_server.address,
1618 data->nfs_server.addrlen,
1619 data->client_address,
1620 data->auth_flavors[0],
1621 data->nfs_server.protocol,
1622 &timeparms,
1623 data->minorversion,
1624 data->net);
1625 if (error < 0)
1626 goto error;
1627
1628 /*
1629 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
1630 * authentication.
1631 */
1632 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
1633 server->caps |= NFS_CAP_UIDGID_NOMAP;
1634
1635 if (data->rsize)
1636 server->rsize = nfs_block_size(data->rsize, NULL);
1637 if (data->wsize)
1638 server->wsize = nfs_block_size(data->wsize, NULL);
1639
1640 server->acregmin = data->acregmin * HZ;
1641 server->acregmax = data->acregmax * HZ;
1642 server->acdirmin = data->acdirmin * HZ;
1643 server->acdirmax = data->acdirmax * HZ;
1644
1645 server->port = data->nfs_server.port;
1646
1647 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1648
1649error:
1650 /* Done */
1651 dprintk("<-- nfs4_init_server() = %d\n", error);
1652 return error;
1653}
1654
1655/*
1656 * Create a version 4 volume record
1657 * - keyed on server and FSID
1658 */
1659struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1660 struct nfs_fh *mntfh)
1661{
1662 struct nfs_server *server;
1663 int error;
1664
1665 dprintk("--> nfs4_create_server()\n");
1666
1667 server = nfs_alloc_server();
1668 if (!server)
1669 return ERR_PTR(-ENOMEM);
1670
1671 /* set up the general RPC client */
1672 error = nfs4_init_server(server, data);
1673 if (error < 0)
1674 goto error;
1675
1676 error = nfs4_server_common_setup(server, mntfh);
1677 if (error < 0)
1678 goto error;
1679
1680 dprintk("<-- nfs4_create_server() = %p\n", server);
1681 return server;
1682
1683error:
1684 nfs_free_server(server);
1685 dprintk("<-- nfs4_create_server() = error %d\n", error);
1686 return ERR_PTR(error);
1687}
1688
1689/*
1690 * Create an NFS4 referral server record
1691 */
1692struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1693 struct nfs_fh *mntfh)
1694{
1695 struct nfs_client *parent_client;
1696 struct nfs_server *server, *parent_server;
1697 int error;
1698
1699 dprintk("--> nfs4_create_referral_server()\n");
1700
1701 server = nfs_alloc_server();
1702 if (!server)
1703 return ERR_PTR(-ENOMEM);
1704
1705 parent_server = NFS_SB(data->sb);
1706 parent_client = parent_server->nfs_client;
1707
1708 /* Initialise the client representation from the parent server */
1709 nfs_server_copy_userdata(server, parent_server);
1710 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1711
1712 /* Get a client representation.
1713 * Note: NFSv4 always uses TCP, */
1714 error = nfs4_set_client(server, data->hostname,
1715 data->addr,
1716 data->addrlen,
1717 parent_client->cl_ipaddr,
1718 data->authflavor,
1719 rpc_protocol(parent_server->client),
1720 parent_server->client->cl_timeout,
1721 parent_client->cl_mvops->minor_version,
1722 parent_client->cl_net);
1723 if (error < 0)
1724 goto error;
1725
1726 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1727 if (error < 0)
1728 goto error;
1729
1730 error = nfs4_server_common_setup(server, mntfh);
1731 if (error < 0)
1732 goto error;
1733
1734 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1735 return server;
1736
1737error:
1738 nfs_free_server(server);
1739 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1740 return ERR_PTR(error);
1741}
1742
1743#endif /* CONFIG_NFS_V4 */
1744
1745/*
1746 * Clone an NFS2, NFS3 or NFS4 server record
1747 */
1748struct nfs_server *nfs_clone_server(struct nfs_server *source,
1749 struct nfs_fh *fh,
1750 struct nfs_fattr *fattr,
1751 rpc_authflavor_t flavor)
1752{
1753 struct nfs_server *server;
1754 struct nfs_fattr *fattr_fsinfo;
1755 int error;
1756
1757 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1758 (unsigned long long) fattr->fsid.major,
1759 (unsigned long long) fattr->fsid.minor);
1760
1761 server = nfs_alloc_server();
1762 if (!server)
1763 return ERR_PTR(-ENOMEM);
1764
1765 error = -ENOMEM;
1766 fattr_fsinfo = nfs_alloc_fattr();
1767 if (fattr_fsinfo == NULL)
1768 goto out_free_server;
1769
1770 /* Copy data from the source */
1771 server->nfs_client = source->nfs_client;
1772 server->destroy = source->destroy;
1773 atomic_inc(&server->nfs_client->cl_count);
1774 nfs_server_copy_userdata(server, source);
1775
1776 server->fsid = fattr->fsid;
1777
1778 error = nfs_init_server_rpcclient(server,
1779 source->client->cl_timeout,
1780 flavor);
1781 if (error < 0)
1782 goto out_free_server;
1783 if (!IS_ERR(source->client_acl))
1784 nfs_init_server_aclclient(server);
1785
1786 /* probe the filesystem info for this server filesystem */
1787 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1788 if (error < 0)
1789 goto out_free_server;
1790
1791 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1792 server->namelen = NFS4_MAXNAMLEN;
1793
1794 dprintk("Cloned FSID: %llx:%llx\n",
1795 (unsigned long long) server->fsid.major,
1796 (unsigned long long) server->fsid.minor);
1797
1798 error = nfs_start_lockd(server);
1799 if (error < 0)
1800 goto out_free_server;
1801
1802 nfs_server_insert_lists(server);
1803 server->mount_time = jiffies;
1804
1805 nfs_free_fattr(fattr_fsinfo);
1806 dprintk("<-- nfs_clone_server() = %p\n", server);
1807 return server;
1808
1809out_free_server:
1810 nfs_free_fattr(fattr_fsinfo);
1811 nfs_free_server(server);
1812 dprintk("<-- nfs_clone_server() = error %d\n", error);
1813 return ERR_PTR(error);
1814}
1815
1816void nfs_clients_init(struct net *net)
1817{
1818 struct nfs_net *nn = net_generic(net, nfs_net_id);
1819
1820 INIT_LIST_HEAD(&nn->nfs_client_list);
1821 INIT_LIST_HEAD(&nn->nfs_volume_list);
1822#ifdef CONFIG_NFS_V4
1823 idr_init(&nn->cb_ident_idr);
1824#endif
1825 spin_lock_init(&nn->nfs_client_lock);
1826 nn->boot_time = CURRENT_TIME;
1827}
1828
1829#ifdef CONFIG_PROC_FS
1830static struct proc_dir_entry *proc_fs_nfs;
1831
1832static int nfs_server_list_open(struct inode *inode, struct file *file);
1833static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1834static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1835static void nfs_server_list_stop(struct seq_file *p, void *v);
1836static int nfs_server_list_show(struct seq_file *m, void *v);
1837
1838static const struct seq_operations nfs_server_list_ops = {
1839 .start = nfs_server_list_start,
1840 .next = nfs_server_list_next,
1841 .stop = nfs_server_list_stop,
1842 .show = nfs_server_list_show,
1843};
1844
1845static const struct file_operations nfs_server_list_fops = {
1846 .open = nfs_server_list_open,
1847 .read = seq_read,
1848 .llseek = seq_lseek,
1849 .release = seq_release,
1850 .owner = THIS_MODULE,
1851};
1852
1853static int nfs_volume_list_open(struct inode *inode, struct file *file);
1854static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1855static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1856static void nfs_volume_list_stop(struct seq_file *p, void *v);
1857static int nfs_volume_list_show(struct seq_file *m, void *v);
1858
1859static const struct seq_operations nfs_volume_list_ops = {
1860 .start = nfs_volume_list_start,
1861 .next = nfs_volume_list_next,
1862 .stop = nfs_volume_list_stop,
1863 .show = nfs_volume_list_show,
1864};
1865
1866static const struct file_operations nfs_volume_list_fops = {
1867 .open = nfs_volume_list_open,
1868 .read = seq_read,
1869 .llseek = seq_lseek,
1870 .release = seq_release,
1871 .owner = THIS_MODULE,
1872};
1873
1874/*
1875 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1876 * we're dealing
1877 */
1878static int nfs_server_list_open(struct inode *inode, struct file *file)
1879{
1880 struct seq_file *m;
1881 int ret;
1882 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1883 struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1884
1885 ret = seq_open(file, &nfs_server_list_ops);
1886 if (ret < 0)
1887 return ret;
1888
1889 m = file->private_data;
1890 m->private = net;
1891
1892 return 0;
1893}
1894
1895/*
1896 * set up the iterator to start reading from the server list and return the first item
1897 */
1898static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1899{
1900 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1901
1902 /* lock the list against modification */
1903 spin_lock(&nn->nfs_client_lock);
1904 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1905}
1906
1907/*
1908 * move to next server
1909 */
1910static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1911{
1912 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1913
1914 return seq_list_next(v, &nn->nfs_client_list, pos);
1915}
1916
1917/*
1918 * clean up after reading from the transports list
1919 */
1920static void nfs_server_list_stop(struct seq_file *p, void *v)
1921{
1922 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1923
1924 spin_unlock(&nn->nfs_client_lock);
1925}
1926
1927/*
1928 * display a header line followed by a load of call lines
1929 */
1930static int nfs_server_list_show(struct seq_file *m, void *v)
1931{
1932 struct nfs_client *clp;
1933 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1934
1935 /* display header on line 1 */
1936 if (v == &nn->nfs_client_list) {
1937 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1938 return 0;
1939 }
1940
1941 /* display one transport per line on subsequent lines */
1942 clp = list_entry(v, struct nfs_client, cl_share_link);
1943
1944 /* Check if the client is initialized */
1945 if (clp->cl_cons_state != NFS_CS_READY)
1946 return 0;
1947
1948 rcu_read_lock();
1949 seq_printf(m, "v%u %s %s %3d %s\n",
1950 clp->rpc_ops->version,
1951 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1952 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1953 atomic_read(&clp->cl_count),
1954 clp->cl_hostname);
1955 rcu_read_unlock();
1956
1957 return 0;
1958}
1959
1960/*
1961 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1962 */
1963static int nfs_volume_list_open(struct inode *inode, struct file *file)
1964{
1965 struct seq_file *m;
1966 int ret;
1967 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1968 struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1969
1970 ret = seq_open(file, &nfs_volume_list_ops);
1971 if (ret < 0)
1972 return ret;
1973
1974 m = file->private_data;
1975 m->private = net;
1976
1977 return 0;
1978}
1979
1980/*
1981 * set up the iterator to start reading from the volume list and return the first item
1982 */
1983static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1984{
1985 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1986
1987 /* lock the list against modification */
1988 spin_lock(&nn->nfs_client_lock);
1989 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1990}
1991
1992/*
1993 * move to next volume
1994 */
1995static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1996{
1997 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1998
1999 return seq_list_next(v, &nn->nfs_volume_list, pos);
2000}
2001
2002/*
2003 * clean up after reading from the transports list
2004 */
2005static void nfs_volume_list_stop(struct seq_file *p, void *v)
2006{
2007 struct nfs_net *nn = net_generic(p->private, nfs_net_id);
2008
2009 spin_unlock(&nn->nfs_client_lock);
2010}
2011
2012/*
2013 * display a header line followed by a load of call lines
2014 */
2015static int nfs_volume_list_show(struct seq_file *m, void *v)
2016{
2017 struct nfs_server *server;
2018 struct nfs_client *clp;
2019 char dev[8], fsid[17];
2020 struct nfs_net *nn = net_generic(m->private, nfs_net_id);
2021
2022 /* display header on line 1 */
2023 if (v == &nn->nfs_volume_list) {
2024 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
2025 return 0;
2026 }
2027 /* display one transport per line on subsequent lines */
2028 server = list_entry(v, struct nfs_server, master_link);
2029 clp = server->nfs_client;
2030
2031 snprintf(dev, 8, "%u:%u",
2032 MAJOR(server->s_dev), MINOR(server->s_dev));
2033
2034 snprintf(fsid, 17, "%llx:%llx",
2035 (unsigned long long) server->fsid.major,
2036 (unsigned long long) server->fsid.minor);
2037
2038 rcu_read_lock();
2039 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
2040 clp->rpc_ops->version,
2041 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
2042 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
2043 dev,
2044 fsid,
2045 nfs_server_fscache_state(server));
2046 rcu_read_unlock();
2047
2048 return 0;
2049}
2050
2051/*
2052 * initialise the /proc/fs/nfsfs/ directory
2053 */
2054int __init nfs_fs_proc_init(void)
2055{
2056 struct proc_dir_entry *p;
2057
2058 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
2059 if (!proc_fs_nfs)
2060 goto error_0;
2061
2062 /* a file of servers with which we're dealing */
2063 p = proc_create("servers", S_IFREG|S_IRUGO,
2064 proc_fs_nfs, &nfs_server_list_fops);
2065 if (!p)
2066 goto error_1;
2067
2068 /* a file of volumes that we have mounted */
2069 p = proc_create("volumes", S_IFREG|S_IRUGO,
2070 proc_fs_nfs, &nfs_volume_list_fops);
2071 if (!p)
2072 goto error_2;
2073 return 0;
2074
2075error_2:
2076 remove_proc_entry("servers", proc_fs_nfs);
2077error_1:
2078 remove_proc_entry("fs/nfsfs", NULL);
2079error_0:
2080 return -ENOMEM;
2081}
2082
2083/*
2084 * clean up the /proc/fs/nfsfs/ directory
2085 */
2086void nfs_fs_proc_exit(void)
2087{
2088 remove_proc_entry("volumes", proc_fs_nfs);
2089 remove_proc_entry("servers", proc_fs_nfs);
2090 remove_proc_entry("fs/nfsfs", NULL);
2091}
2092
2093#endif /* CONFIG_PROC_FS */
2094
2095module_param(nfs4_disable_idmapping, bool, 0644);
2096MODULE_PARM_DESC(nfs4_disable_idmapping,
2097 "Turn off NFSv4 idmapping when using 'sec=sys'");