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TOMOYO Linux Cross Reference
Linux/fs/nfs/client.c

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

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