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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                         continue;
317 
318                 atomic_inc(&clp->cl_count);
319                 return clp;
320         }
321         return NULL;
322 }
323 
324 static bool nfs_client_init_is_complete(const struct nfs_client *clp)
325 {
326         return clp->cl_cons_state <= NFS_CS_READY;
327 }
328 
329 int nfs_wait_client_init_complete(const struct nfs_client *clp)
330 {
331         return wait_event_killable(nfs_client_active_wq,
332                         nfs_client_init_is_complete(clp));
333 }
334 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
335 
336 /*
337  * Found an existing client.  Make sure it's ready before returning.
338  */
339 static struct nfs_client *
340 nfs_found_client(const struct nfs_client_initdata *cl_init,
341                  struct nfs_client *clp)
342 {
343         int error;
344 
345         error = nfs_wait_client_init_complete(clp);
346         if (error < 0) {
347                 nfs_put_client(clp);
348                 return ERR_PTR(-ERESTARTSYS);
349         }
350 
351         if (clp->cl_cons_state < NFS_CS_READY) {
352                 error = clp->cl_cons_state;
353                 nfs_put_client(clp);
354                 return ERR_PTR(error);
355         }
356 
357         smp_rmb();
358 
359         dprintk("<-- %s found nfs_client %p for %s\n",
360                 __func__, clp, cl_init->hostname ?: "");
361         return clp;
362 }
363 
364 /*
365  * Look up a client by IP address and protocol version
366  * - creates a new record if one doesn't yet exist
367  */
368 struct nfs_client *
369 nfs_get_client(const struct nfs_client_initdata *cl_init,
370                rpc_authflavor_t authflavour)
371 {
372         struct nfs_client *clp, *new = NULL;
373         struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
374         const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
375 
376         if (cl_init->hostname == NULL) {
377                 WARN_ON(1);
378                 return NULL;
379         }
380 
381         dprintk("--> nfs_get_client(%s,v%u)\n",
382                 cl_init->hostname, rpc_ops->version);
383 
384         /* see if the client already exists */
385         do {
386                 spin_lock(&nn->nfs_client_lock);
387 
388                 clp = nfs_match_client(cl_init);
389                 if (clp) {
390                         spin_unlock(&nn->nfs_client_lock);
391                         if (new)
392                                 new->rpc_ops->free_client(new);
393                         return nfs_found_client(cl_init, clp);
394                 }
395                 if (new) {
396                         list_add_tail(&new->cl_share_link,
397                                         &nn->nfs_client_list);
398                         spin_unlock(&nn->nfs_client_lock);
399                         new->cl_flags = cl_init->init_flags;
400                         return rpc_ops->init_client(new, cl_init);
401                 }
402 
403                 spin_unlock(&nn->nfs_client_lock);
404 
405                 new = rpc_ops->alloc_client(cl_init);
406         } while (!IS_ERR(new));
407 
408         dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
409                 cl_init->hostname, PTR_ERR(new));
410         return new;
411 }
412 EXPORT_SYMBOL_GPL(nfs_get_client);
413 
414 /*
415  * Mark a server as ready or failed
416  */
417 void nfs_mark_client_ready(struct nfs_client *clp, int state)
418 {
419         smp_wmb();
420         clp->cl_cons_state = state;
421         wake_up_all(&nfs_client_active_wq);
422 }
423 EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
424 
425 /*
426  * Initialise the timeout values for a connection
427  */
428 void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
429                                     int timeo, int retrans)
430 {
431         to->to_initval = timeo * HZ / 10;
432         to->to_retries = retrans;
433 
434         switch (proto) {
435         case XPRT_TRANSPORT_TCP:
436         case XPRT_TRANSPORT_RDMA:
437                 if (retrans == NFS_UNSPEC_RETRANS)
438                         to->to_retries = NFS_DEF_TCP_RETRANS;
439                 if (timeo == NFS_UNSPEC_TIMEO || to->to_retries == 0)
440                         to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
441                 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
442                         to->to_initval = NFS_MAX_TCP_TIMEOUT;
443                 to->to_increment = to->to_initval;
444                 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
445                 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
446                         to->to_maxval = NFS_MAX_TCP_TIMEOUT;
447                 if (to->to_maxval < to->to_initval)
448                         to->to_maxval = to->to_initval;
449                 to->to_exponential = 0;
450                 break;
451         case XPRT_TRANSPORT_UDP:
452                 if (retrans == NFS_UNSPEC_RETRANS)
453                         to->to_retries = NFS_DEF_UDP_RETRANS;
454                 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
455                         to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
456                 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
457                         to->to_initval = NFS_MAX_UDP_TIMEOUT;
458                 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
459                 to->to_exponential = 1;
460                 break;
461         default:
462                 BUG();
463         }
464 }
465 EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
466 
467 /*
468  * Create an RPC client handle
469  */
470 int nfs_create_rpc_client(struct nfs_client *clp,
471                           const struct nfs_client_initdata *cl_init,
472                           rpc_authflavor_t flavor)
473 {
474         struct rpc_clnt         *clnt = NULL;
475         struct rpc_create_args args = {
476                 .net            = clp->cl_net,
477                 .protocol       = clp->cl_proto,
478                 .address        = (struct sockaddr *)&clp->cl_addr,
479                 .addrsize       = clp->cl_addrlen,
480                 .timeout        = cl_init->timeparms,
481                 .servername     = clp->cl_hostname,
482                 .nodename       = cl_init->nodename,
483                 .program        = &nfs_program,
484                 .version        = clp->rpc_ops->version,
485                 .authflavor     = flavor,
486         };
487 
488         if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
489                 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
490         if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
491                 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
492         if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
493                 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
494         if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
495                 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
496 
497         if (!IS_ERR(clp->cl_rpcclient))
498                 return 0;
499 
500         clnt = rpc_create(&args);
501         if (IS_ERR(clnt)) {
502                 dprintk("%s: cannot create RPC client. Error = %ld\n",
503                                 __func__, PTR_ERR(clnt));
504                 return PTR_ERR(clnt);
505         }
506 
507         clp->cl_rpcclient = clnt;
508         return 0;
509 }
510 EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
511 
512 /*
513  * Version 2 or 3 client destruction
514  */
515 static void nfs_destroy_server(struct nfs_server *server)
516 {
517         if (server->nlm_host)
518                 nlmclnt_done(server->nlm_host);
519 }
520 
521 /*
522  * Version 2 or 3 lockd setup
523  */
524 static int nfs_start_lockd(struct nfs_server *server)
525 {
526         struct nlm_host *host;
527         struct nfs_client *clp = server->nfs_client;
528         struct nlmclnt_initdata nlm_init = {
529                 .hostname       = clp->cl_hostname,
530                 .address        = (struct sockaddr *)&clp->cl_addr,
531                 .addrlen        = clp->cl_addrlen,
532                 .nfs_version    = clp->rpc_ops->version,
533                 .noresvport     = server->flags & NFS_MOUNT_NORESVPORT ?
534                                         1 : 0,
535                 .net            = clp->cl_net,
536         };
537 
538         if (nlm_init.nfs_version > 3)
539                 return 0;
540         if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
541                         (server->flags & NFS_MOUNT_LOCAL_FCNTL))
542                 return 0;
543 
544         switch (clp->cl_proto) {
545                 default:
546                         nlm_init.protocol = IPPROTO_TCP;
547                         break;
548                 case XPRT_TRANSPORT_UDP:
549                         nlm_init.protocol = IPPROTO_UDP;
550         }
551 
552         host = nlmclnt_init(&nlm_init);
553         if (IS_ERR(host))
554                 return PTR_ERR(host);
555 
556         server->nlm_host = host;
557         server->destroy = nfs_destroy_server;
558         return 0;
559 }
560 
561 /*
562  * Create a general RPC client
563  */
564 int nfs_init_server_rpcclient(struct nfs_server *server,
565                 const struct rpc_timeout *timeo,
566                 rpc_authflavor_t pseudoflavour)
567 {
568         struct nfs_client *clp = server->nfs_client;
569 
570         server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
571                                                         pseudoflavour);
572         if (IS_ERR(server->client)) {
573                 dprintk("%s: couldn't create rpc_client!\n", __func__);
574                 return PTR_ERR(server->client);
575         }
576 
577         memcpy(&server->client->cl_timeout_default,
578                         timeo,
579                         sizeof(server->client->cl_timeout_default));
580         server->client->cl_timeout = &server->client->cl_timeout_default;
581         server->client->cl_softrtry = 0;
582         if (server->flags & NFS_MOUNT_SOFT)
583                 server->client->cl_softrtry = 1;
584 
585         return 0;
586 }
587 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
588 
589 /**
590  * nfs_init_client - Initialise an NFS2 or NFS3 client
591  *
592  * @clp: nfs_client to initialise
593  * @cl_init: Initialisation parameters
594  *
595  * Returns pointer to an NFS client, or an ERR_PTR value.
596  */
597 struct nfs_client *nfs_init_client(struct nfs_client *clp,
598                                    const struct nfs_client_initdata *cl_init)
599 {
600         int error;
601 
602         if (clp->cl_cons_state == NFS_CS_READY) {
603                 /* the client is already initialised */
604                 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
605                 return clp;
606         }
607 
608         /*
609          * Create a client RPC handle for doing FSSTAT with UNIX auth only
610          * - RFC 2623, sec 2.3.2
611          */
612         error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
613         if (error < 0)
614                 goto error;
615         nfs_mark_client_ready(clp, NFS_CS_READY);
616         return clp;
617 
618 error:
619         nfs_mark_client_ready(clp, error);
620         nfs_put_client(clp);
621         dprintk("<-- nfs_init_client() = xerror %d\n", error);
622         return ERR_PTR(error);
623 }
624 EXPORT_SYMBOL_GPL(nfs_init_client);
625 
626 /*
627  * Create a version 2 or 3 client
628  */
629 static int nfs_init_server(struct nfs_server *server,
630                            const struct nfs_parsed_mount_data *data,
631                            struct nfs_subversion *nfs_mod)
632 {
633         struct rpc_timeout timeparms;
634         struct nfs_client_initdata cl_init = {
635                 .hostname = data->nfs_server.hostname,
636                 .addr = (const struct sockaddr *)&data->nfs_server.address,
637                 .addrlen = data->nfs_server.addrlen,
638                 .nfs_mod = nfs_mod,
639                 .proto = data->nfs_server.protocol,
640                 .net = data->net,
641                 .timeparms = &timeparms,
642         };
643         struct nfs_client *clp;
644         int error;
645 
646         dprintk("--> nfs_init_server()\n");
647 
648         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
649                         data->timeo, data->retrans);
650         if (data->flags & NFS_MOUNT_NORESVPORT)
651                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
652 
653         /* Allocate or find a client reference we can use */
654         clp = nfs_get_client(&cl_init, RPC_AUTH_UNIX);
655         if (IS_ERR(clp)) {
656                 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
657                 return PTR_ERR(clp);
658         }
659 
660         server->nfs_client = clp;
661 
662         /* Initialise the client representation from the mount data */
663         server->flags = data->flags;
664         server->options = data->options;
665         server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
666                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
667                 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
668 
669         if (data->rsize)
670                 server->rsize = nfs_block_size(data->rsize, NULL);
671         if (data->wsize)
672                 server->wsize = nfs_block_size(data->wsize, NULL);
673 
674         server->acregmin = data->acregmin * HZ;
675         server->acregmax = data->acregmax * HZ;
676         server->acdirmin = data->acdirmin * HZ;
677         server->acdirmax = data->acdirmax * HZ;
678 
679         /* Start lockd here, before we might error out */
680         error = nfs_start_lockd(server);
681         if (error < 0)
682                 goto error;
683 
684         server->port = data->nfs_server.port;
685         server->auth_info = data->auth_info;
686 
687         error = nfs_init_server_rpcclient(server, &timeparms,
688                                           data->selected_flavor);
689         if (error < 0)
690                 goto error;
691 
692         /* Preserve the values of mount_server-related mount options */
693         if (data->mount_server.addrlen) {
694                 memcpy(&server->mountd_address, &data->mount_server.address,
695                         data->mount_server.addrlen);
696                 server->mountd_addrlen = data->mount_server.addrlen;
697         }
698         server->mountd_version = data->mount_server.version;
699         server->mountd_port = data->mount_server.port;
700         server->mountd_protocol = data->mount_server.protocol;
701 
702         server->namelen  = data->namlen;
703         dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
704         return 0;
705 
706 error:
707         server->nfs_client = NULL;
708         nfs_put_client(clp);
709         dprintk("<-- nfs_init_server() = xerror %d\n", error);
710         return error;
711 }
712 
713 /*
714  * Load up the server record from information gained in an fsinfo record
715  */
716 static void nfs_server_set_fsinfo(struct nfs_server *server,
717                                   struct nfs_fsinfo *fsinfo)
718 {
719         unsigned long max_rpc_payload;
720 
721         /* Work out a lot of parameters */
722         if (server->rsize == 0)
723                 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
724         if (server->wsize == 0)
725                 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
726 
727         if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
728                 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
729         if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
730                 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
731 
732         max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
733         if (server->rsize > max_rpc_payload)
734                 server->rsize = max_rpc_payload;
735         if (server->rsize > NFS_MAX_FILE_IO_SIZE)
736                 server->rsize = NFS_MAX_FILE_IO_SIZE;
737         server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
738 
739         server->backing_dev_info.name = "nfs";
740         server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
741 
742         if (server->wsize > max_rpc_payload)
743                 server->wsize = max_rpc_payload;
744         if (server->wsize > NFS_MAX_FILE_IO_SIZE)
745                 server->wsize = NFS_MAX_FILE_IO_SIZE;
746         server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
747 
748         server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
749 
750         server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
751         if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES)
752                 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES;
753         if (server->dtsize > server->rsize)
754                 server->dtsize = server->rsize;
755 
756         if (server->flags & NFS_MOUNT_NOAC) {
757                 server->acregmin = server->acregmax = 0;
758                 server->acdirmin = server->acdirmax = 0;
759         }
760 
761         server->maxfilesize = fsinfo->maxfilesize;
762 
763         server->time_delta = fsinfo->time_delta;
764 
765         server->clone_blksize = fsinfo->clone_blksize;
766         /* We're airborne Set socket buffersize */
767         rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
768 }
769 
770 /*
771  * Probe filesystem information, including the FSID on v2/v3
772  */
773 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
774 {
775         struct nfs_fsinfo fsinfo;
776         struct nfs_client *clp = server->nfs_client;
777         int error;
778 
779         dprintk("--> nfs_probe_fsinfo()\n");
780 
781         if (clp->rpc_ops->set_capabilities != NULL) {
782                 error = clp->rpc_ops->set_capabilities(server, mntfh);
783                 if (error < 0)
784                         goto out_error;
785         }
786 
787         fsinfo.fattr = fattr;
788         fsinfo.layouttype = 0;
789         error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
790         if (error < 0)
791                 goto out_error;
792 
793         nfs_server_set_fsinfo(server, &fsinfo);
794 
795         /* Get some general file system info */
796         if (server->namelen == 0) {
797                 struct nfs_pathconf pathinfo;
798 
799                 pathinfo.fattr = fattr;
800                 nfs_fattr_init(fattr);
801 
802                 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
803                         server->namelen = pathinfo.max_namelen;
804         }
805 
806         dprintk("<-- nfs_probe_fsinfo() = 0\n");
807         return 0;
808 
809 out_error:
810         dprintk("nfs_probe_fsinfo: error = %d\n", -error);
811         return error;
812 }
813 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
814 
815 /*
816  * Copy useful information when duplicating a server record
817  */
818 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
819 {
820         target->flags = source->flags;
821         target->rsize = source->rsize;
822         target->wsize = source->wsize;
823         target->acregmin = source->acregmin;
824         target->acregmax = source->acregmax;
825         target->acdirmin = source->acdirmin;
826         target->acdirmax = source->acdirmax;
827         target->caps = source->caps;
828         target->options = source->options;
829         target->auth_info = source->auth_info;
830 }
831 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
832 
833 void nfs_server_insert_lists(struct nfs_server *server)
834 {
835         struct nfs_client *clp = server->nfs_client;
836         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
837 
838         spin_lock(&nn->nfs_client_lock);
839         list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
840         list_add_tail(&server->master_link, &nn->nfs_volume_list);
841         clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
842         spin_unlock(&nn->nfs_client_lock);
843 
844 }
845 EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
846 
847 void nfs_server_remove_lists(struct nfs_server *server)
848 {
849         struct nfs_client *clp = server->nfs_client;
850         struct nfs_net *nn;
851 
852         if (clp == NULL)
853                 return;
854         nn = net_generic(clp->cl_net, nfs_net_id);
855         spin_lock(&nn->nfs_client_lock);
856         list_del_rcu(&server->client_link);
857         if (list_empty(&clp->cl_superblocks))
858                 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
859         list_del(&server->master_link);
860         spin_unlock(&nn->nfs_client_lock);
861 
862         synchronize_rcu();
863 }
864 EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
865 
866 /*
867  * Allocate and initialise a server record
868  */
869 struct nfs_server *nfs_alloc_server(void)
870 {
871         struct nfs_server *server;
872 
873         server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
874         if (!server)
875                 return NULL;
876 
877         server->client = server->client_acl = ERR_PTR(-EINVAL);
878 
879         /* Zero out the NFS state stuff */
880         INIT_LIST_HEAD(&server->client_link);
881         INIT_LIST_HEAD(&server->master_link);
882         INIT_LIST_HEAD(&server->delegations);
883         INIT_LIST_HEAD(&server->layouts);
884         INIT_LIST_HEAD(&server->state_owners_lru);
885 
886         atomic_set(&server->active, 0);
887 
888         server->io_stats = nfs_alloc_iostats();
889         if (!server->io_stats) {
890                 kfree(server);
891                 return NULL;
892         }
893 
894         if (bdi_init(&server->backing_dev_info)) {
895                 nfs_free_iostats(server->io_stats);
896                 kfree(server);
897                 return NULL;
898         }
899 
900         ida_init(&server->openowner_id);
901         ida_init(&server->lockowner_id);
902         pnfs_init_server(server);
903 
904         return server;
905 }
906 EXPORT_SYMBOL_GPL(nfs_alloc_server);
907 
908 /*
909  * Free up a server record
910  */
911 void nfs_free_server(struct nfs_server *server)
912 {
913         dprintk("--> nfs_free_server()\n");
914 
915         nfs_server_remove_lists(server);
916 
917         if (server->destroy != NULL)
918                 server->destroy(server);
919 
920         if (!IS_ERR(server->client_acl))
921                 rpc_shutdown_client(server->client_acl);
922         if (!IS_ERR(server->client))
923                 rpc_shutdown_client(server->client);
924 
925         nfs_put_client(server->nfs_client);
926 
927         ida_destroy(&server->lockowner_id);
928         ida_destroy(&server->openowner_id);
929         nfs_free_iostats(server->io_stats);
930         bdi_destroy(&server->backing_dev_info);
931         kfree(server);
932         nfs_release_automount_timer();
933         dprintk("<-- nfs_free_server()\n");
934 }
935 EXPORT_SYMBOL_GPL(nfs_free_server);
936 
937 /*
938  * Create a version 2 or 3 volume record
939  * - keyed on server and FSID
940  */
941 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
942                                      struct nfs_subversion *nfs_mod)
943 {
944         struct nfs_server *server;
945         struct nfs_fattr *fattr;
946         int error;
947 
948         server = nfs_alloc_server();
949         if (!server)
950                 return ERR_PTR(-ENOMEM);
951 
952         error = -ENOMEM;
953         fattr = nfs_alloc_fattr();
954         if (fattr == NULL)
955                 goto error;
956 
957         /* Get a client representation */
958         error = nfs_init_server(server, mount_info->parsed, nfs_mod);
959         if (error < 0)
960                 goto error;
961 
962         /* Probe the root fh to retrieve its FSID */
963         error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
964         if (error < 0)
965                 goto error;
966         if (server->nfs_client->rpc_ops->version == 3) {
967                 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
968                         server->namelen = NFS3_MAXNAMLEN;
969                 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
970                         server->caps |= NFS_CAP_READDIRPLUS;
971         } else {
972                 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
973                         server->namelen = NFS2_MAXNAMLEN;
974         }
975 
976         if (!(fattr->valid & NFS_ATTR_FATTR)) {
977                 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
978                 if (error < 0) {
979                         dprintk("nfs_create_server: getattr error = %d\n", -error);
980                         goto error;
981                 }
982         }
983         memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
984 
985         dprintk("Server FSID: %llx:%llx\n",
986                 (unsigned long long) server->fsid.major,
987                 (unsigned long long) server->fsid.minor);
988 
989         nfs_server_insert_lists(server);
990         server->mount_time = jiffies;
991         nfs_free_fattr(fattr);
992         return server;
993 
994 error:
995         nfs_free_fattr(fattr);
996         nfs_free_server(server);
997         return ERR_PTR(error);
998 }
999 EXPORT_SYMBOL_GPL(nfs_create_server);
1000 
1001 /*
1002  * Clone an NFS2, NFS3 or NFS4 server record
1003  */
1004 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1005                                     struct nfs_fh *fh,
1006                                     struct nfs_fattr *fattr,
1007                                     rpc_authflavor_t flavor)
1008 {
1009         struct nfs_server *server;
1010         struct nfs_fattr *fattr_fsinfo;
1011         int error;
1012 
1013         dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1014                 (unsigned long long) fattr->fsid.major,
1015                 (unsigned long long) fattr->fsid.minor);
1016 
1017         server = nfs_alloc_server();
1018         if (!server)
1019                 return ERR_PTR(-ENOMEM);
1020 
1021         error = -ENOMEM;
1022         fattr_fsinfo = nfs_alloc_fattr();
1023         if (fattr_fsinfo == NULL)
1024                 goto out_free_server;
1025 
1026         /* Copy data from the source */
1027         server->nfs_client = source->nfs_client;
1028         server->destroy = source->destroy;
1029         atomic_inc(&server->nfs_client->cl_count);
1030         nfs_server_copy_userdata(server, source);
1031 
1032         server->fsid = fattr->fsid;
1033 
1034         error = nfs_init_server_rpcclient(server,
1035                         source->client->cl_timeout,
1036                         flavor);
1037         if (error < 0)
1038                 goto out_free_server;
1039 
1040         /* probe the filesystem info for this server filesystem */
1041         error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1042         if (error < 0)
1043                 goto out_free_server;
1044 
1045         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1046                 server->namelen = NFS4_MAXNAMLEN;
1047 
1048         dprintk("Cloned FSID: %llx:%llx\n",
1049                 (unsigned long long) server->fsid.major,
1050                 (unsigned long long) server->fsid.minor);
1051 
1052         error = nfs_start_lockd(server);
1053         if (error < 0)
1054                 goto out_free_server;
1055 
1056         nfs_server_insert_lists(server);
1057         server->mount_time = jiffies;
1058 
1059         nfs_free_fattr(fattr_fsinfo);
1060         dprintk("<-- nfs_clone_server() = %p\n", server);
1061         return server;
1062 
1063 out_free_server:
1064         nfs_free_fattr(fattr_fsinfo);
1065         nfs_free_server(server);
1066         dprintk("<-- nfs_clone_server() = error %d\n", error);
1067         return ERR_PTR(error);
1068 }
1069 EXPORT_SYMBOL_GPL(nfs_clone_server);
1070 
1071 void nfs_clients_init(struct net *net)
1072 {
1073         struct nfs_net *nn = net_generic(net, nfs_net_id);
1074 
1075         INIT_LIST_HEAD(&nn->nfs_client_list);
1076         INIT_LIST_HEAD(&nn->nfs_volume_list);
1077 #if IS_ENABLED(CONFIG_NFS_V4)
1078         idr_init(&nn->cb_ident_idr);
1079 #endif
1080         spin_lock_init(&nn->nfs_client_lock);
1081         nn->boot_time = CURRENT_TIME;
1082 }
1083 
1084 #ifdef CONFIG_PROC_FS
1085 static int nfs_server_list_open(struct inode *inode, struct file *file);
1086 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1087 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1088 static void nfs_server_list_stop(struct seq_file *p, void *v);
1089 static int nfs_server_list_show(struct seq_file *m, void *v);
1090 
1091 static const struct seq_operations nfs_server_list_ops = {
1092         .start  = nfs_server_list_start,
1093         .next   = nfs_server_list_next,
1094         .stop   = nfs_server_list_stop,
1095         .show   = nfs_server_list_show,
1096 };
1097 
1098 static const struct file_operations nfs_server_list_fops = {
1099         .open           = nfs_server_list_open,
1100         .read           = seq_read,
1101         .llseek         = seq_lseek,
1102         .release        = seq_release_net,
1103 };
1104 
1105 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1106 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1107 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1108 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1109 static int nfs_volume_list_show(struct seq_file *m, void *v);
1110 
1111 static const struct seq_operations nfs_volume_list_ops = {
1112         .start  = nfs_volume_list_start,
1113         .next   = nfs_volume_list_next,
1114         .stop   = nfs_volume_list_stop,
1115         .show   = nfs_volume_list_show,
1116 };
1117 
1118 static const struct file_operations nfs_volume_list_fops = {
1119         .open           = nfs_volume_list_open,
1120         .read           = seq_read,
1121         .llseek         = seq_lseek,
1122         .release        = seq_release_net,
1123 };
1124 
1125 /*
1126  * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1127  * we're dealing
1128  */
1129 static int nfs_server_list_open(struct inode *inode, struct file *file)
1130 {
1131         return seq_open_net(inode, file, &nfs_server_list_ops,
1132                            sizeof(struct seq_net_private));
1133 }
1134 
1135 /*
1136  * set up the iterator to start reading from the server list and return the first item
1137  */
1138 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1139                                 __acquires(&nn->nfs_client_lock)
1140 {
1141         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1142 
1143         /* lock the list against modification */
1144         spin_lock(&nn->nfs_client_lock);
1145         return seq_list_start_head(&nn->nfs_client_list, *_pos);
1146 }
1147 
1148 /*
1149  * move to next server
1150  */
1151 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1152 {
1153         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1154 
1155         return seq_list_next(v, &nn->nfs_client_list, pos);
1156 }
1157 
1158 /*
1159  * clean up after reading from the transports list
1160  */
1161 static void nfs_server_list_stop(struct seq_file *p, void *v)
1162                                 __releases(&nn->nfs_client_lock)
1163 {
1164         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1165 
1166         spin_unlock(&nn->nfs_client_lock);
1167 }
1168 
1169 /*
1170  * display a header line followed by a load of call lines
1171  */
1172 static int nfs_server_list_show(struct seq_file *m, void *v)
1173 {
1174         struct nfs_client *clp;
1175         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1176 
1177         /* display header on line 1 */
1178         if (v == &nn->nfs_client_list) {
1179                 seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
1180                 return 0;
1181         }
1182 
1183         /* display one transport per line on subsequent lines */
1184         clp = list_entry(v, struct nfs_client, cl_share_link);
1185 
1186         /* Check if the client is initialized */
1187         if (clp->cl_cons_state != NFS_CS_READY)
1188                 return 0;
1189 
1190         rcu_read_lock();
1191         seq_printf(m, "v%u %s %s %3d %s\n",
1192                    clp->rpc_ops->version,
1193                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1194                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1195                    atomic_read(&clp->cl_count),
1196                    clp->cl_hostname);
1197         rcu_read_unlock();
1198 
1199         return 0;
1200 }
1201 
1202 /*
1203  * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1204  */
1205 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1206 {
1207         return seq_open_net(inode, file, &nfs_volume_list_ops,
1208                            sizeof(struct seq_net_private));
1209 }
1210 
1211 /*
1212  * set up the iterator to start reading from the volume list and return the first item
1213  */
1214 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1215                                 __acquires(&nn->nfs_client_lock)
1216 {
1217         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1218 
1219         /* lock the list against modification */
1220         spin_lock(&nn->nfs_client_lock);
1221         return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1222 }
1223 
1224 /*
1225  * move to next volume
1226  */
1227 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1228 {
1229         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1230 
1231         return seq_list_next(v, &nn->nfs_volume_list, pos);
1232 }
1233 
1234 /*
1235  * clean up after reading from the transports list
1236  */
1237 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1238                                 __releases(&nn->nfs_client_lock)
1239 {
1240         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1241 
1242         spin_unlock(&nn->nfs_client_lock);
1243 }
1244 
1245 /*
1246  * display a header line followed by a load of call lines
1247  */
1248 static int nfs_volume_list_show(struct seq_file *m, void *v)
1249 {
1250         struct nfs_server *server;
1251         struct nfs_client *clp;
1252         char dev[13];   // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1253         char fsid[34];  // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1254         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1255 
1256         /* display header on line 1 */
1257         if (v == &nn->nfs_volume_list) {
1258                 seq_puts(m, "NV SERVER   PORT DEV          FSID"
1259                             "                              FSC\n");
1260                 return 0;
1261         }
1262         /* display one transport per line on subsequent lines */
1263         server = list_entry(v, struct nfs_server, master_link);
1264         clp = server->nfs_client;
1265 
1266         snprintf(dev, sizeof(dev), "%u:%u",
1267                  MAJOR(server->s_dev), MINOR(server->s_dev));
1268 
1269         snprintf(fsid, sizeof(fsid), "%llx:%llx",
1270                  (unsigned long long) server->fsid.major,
1271                  (unsigned long long) server->fsid.minor);
1272 
1273         rcu_read_lock();
1274         seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1275                    clp->rpc_ops->version,
1276                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1277                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1278                    dev,
1279                    fsid,
1280                    nfs_server_fscache_state(server));
1281         rcu_read_unlock();
1282 
1283         return 0;
1284 }
1285 
1286 int nfs_fs_proc_net_init(struct net *net)
1287 {
1288         struct nfs_net *nn = net_generic(net, nfs_net_id);
1289         struct proc_dir_entry *p;
1290 
1291         nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1292         if (!nn->proc_nfsfs)
1293                 goto error_0;
1294 
1295         /* a file of servers with which we're dealing */
1296         p = proc_create("servers", S_IFREG|S_IRUGO,
1297                         nn->proc_nfsfs, &nfs_server_list_fops);
1298         if (!p)
1299                 goto error_1;
1300 
1301         /* a file of volumes that we have mounted */
1302         p = proc_create("volumes", S_IFREG|S_IRUGO,
1303                         nn->proc_nfsfs, &nfs_volume_list_fops);
1304         if (!p)
1305                 goto error_1;
1306         return 0;
1307 
1308 error_1:
1309         remove_proc_subtree("nfsfs", net->proc_net);
1310 error_0:
1311         return -ENOMEM;
1312 }
1313 
1314 void nfs_fs_proc_net_exit(struct net *net)
1315 {
1316         remove_proc_subtree("nfsfs", net->proc_net);
1317 }
1318 
1319 /*
1320  * initialise the /proc/fs/nfsfs/ directory
1321  */
1322 int __init nfs_fs_proc_init(void)
1323 {
1324         if (!proc_mkdir("fs/nfsfs", NULL))
1325                 goto error_0;
1326 
1327         /* a file of servers with which we're dealing */
1328         if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1329                 goto error_1;
1330 
1331         /* a file of volumes that we have mounted */
1332         if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1333                 goto error_1;
1334 
1335         return 0;
1336 error_1:
1337         remove_proc_subtree("fs/nfsfs", NULL);
1338 error_0:
1339         return -ENOMEM;
1340 }
1341 
1342 /*
1343  * clean up the /proc/fs/nfsfs/ directory
1344  */
1345 void nfs_fs_proc_exit(void)
1346 {
1347         remove_proc_subtree("fs/nfsfs", NULL);
1348 }
1349 
1350 #endif /* CONFIG_PROC_FS */
1351 

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