~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.15-rc5 ] ~ [ linux-5.14.11 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.72 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.152 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.210 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.250 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.286 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.288 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         int err = -ENOMEM;
155 
156         if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
157                 goto error_0;
158 
159         clp->cl_nfs_mod = cl_init->nfs_mod;
160         if (!try_module_get(clp->cl_nfs_mod->owner))
161                 goto error_dealloc;
162 
163         clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
164 
165         refcount_set(&clp->cl_count, 1);
166         clp->cl_cons_state = NFS_CS_INITING;
167 
168         memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
169         clp->cl_addrlen = cl_init->addrlen;
170 
171         if (cl_init->hostname) {
172                 err = -ENOMEM;
173                 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
174                 if (!clp->cl_hostname)
175                         goto error_cleanup;
176         }
177 
178         INIT_LIST_HEAD(&clp->cl_superblocks);
179         clp->cl_rpcclient = ERR_PTR(-EINVAL);
180 
181         clp->cl_proto = cl_init->proto;
182         clp->cl_net = get_net(cl_init->net);
183 
184         clp->cl_principal = "*";
185         nfs_fscache_get_client_cookie(clp);
186 
187         return clp;
188 
189 error_cleanup:
190         put_nfs_version(clp->cl_nfs_mod);
191 error_dealloc:
192         kfree(clp);
193 error_0:
194         return ERR_PTR(err);
195 }
196 EXPORT_SYMBOL_GPL(nfs_alloc_client);
197 
198 #if IS_ENABLED(CONFIG_NFS_V4)
199 void nfs_cleanup_cb_ident_idr(struct net *net)
200 {
201         struct nfs_net *nn = net_generic(net, nfs_net_id);
202 
203         idr_destroy(&nn->cb_ident_idr);
204 }
205 
206 /* nfs_client_lock held */
207 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
208 {
209         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
210 
211         if (clp->cl_cb_ident)
212                 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
213 }
214 
215 static void pnfs_init_server(struct nfs_server *server)
216 {
217         rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
218 }
219 
220 #else
221 void nfs_cleanup_cb_ident_idr(struct net *net)
222 {
223 }
224 
225 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
226 {
227 }
228 
229 static void pnfs_init_server(struct nfs_server *server)
230 {
231 }
232 
233 #endif /* CONFIG_NFS_V4 */
234 
235 /*
236  * Destroy a shared client record
237  */
238 void nfs_free_client(struct nfs_client *clp)
239 {
240         nfs_fscache_release_client_cookie(clp);
241 
242         /* -EIO all pending I/O */
243         if (!IS_ERR(clp->cl_rpcclient))
244                 rpc_shutdown_client(clp->cl_rpcclient);
245 
246         put_net(clp->cl_net);
247         put_nfs_version(clp->cl_nfs_mod);
248         kfree(clp->cl_hostname);
249         kfree(clp->cl_acceptor);
250         kfree(clp);
251 }
252 EXPORT_SYMBOL_GPL(nfs_free_client);
253 
254 /*
255  * Release a reference to a shared client record
256  */
257 void nfs_put_client(struct nfs_client *clp)
258 {
259         struct nfs_net *nn;
260 
261         if (!clp)
262                 return;
263 
264         nn = net_generic(clp->cl_net, nfs_net_id);
265 
266         if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
267                 list_del(&clp->cl_share_link);
268                 nfs_cb_idr_remove_locked(clp);
269                 spin_unlock(&nn->nfs_client_lock);
270 
271                 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
272 
273                 clp->rpc_ops->free_client(clp);
274         }
275 }
276 EXPORT_SYMBOL_GPL(nfs_put_client);
277 
278 /*
279  * Find an nfs_client on the list that matches the initialisation data
280  * that is supplied.
281  */
282 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
283 {
284         struct nfs_client *clp;
285         const struct sockaddr *sap = data->addr;
286         struct nfs_net *nn = net_generic(data->net, nfs_net_id);
287         int error;
288 
289 again:
290         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
291                 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
292                 /* Don't match clients that failed to initialise properly */
293                 if (clp->cl_cons_state < 0)
294                         continue;
295 
296                 /* If a client is still initializing then we need to wait */
297                 if (clp->cl_cons_state > NFS_CS_READY) {
298                         refcount_inc(&clp->cl_count);
299                         spin_unlock(&nn->nfs_client_lock);
300                         error = nfs_wait_client_init_complete(clp);
301                         nfs_put_client(clp);
302                         spin_lock(&nn->nfs_client_lock);
303                         if (error < 0)
304                                 return ERR_PTR(error);
305                         goto again;
306                 }
307 
308                 /* Different NFS versions cannot share the same nfs_client */
309                 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
310                         continue;
311 
312                 if (clp->cl_proto != data->proto)
313                         continue;
314                 /* Match nfsv4 minorversion */
315                 if (clp->cl_minorversion != data->minorversion)
316                         continue;
317                 /* Match the full socket address */
318                 if (!rpc_cmp_addr_port(sap, clap))
319                         /* Match all xprt_switch full socket addresses */
320                         if (IS_ERR(clp->cl_rpcclient) ||
321                             !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
322                                                            sap))
323                                 continue;
324 
325                 refcount_inc(&clp->cl_count);
326                 return clp;
327         }
328         return NULL;
329 }
330 
331 /*
332  * Return true if @clp is done initializing, false if still working on it.
333  *
334  * Use nfs_client_init_status to check if it was successful.
335  */
336 bool nfs_client_init_is_complete(const struct nfs_client *clp)
337 {
338         return clp->cl_cons_state <= NFS_CS_READY;
339 }
340 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
341 
342 /*
343  * Return 0 if @clp was successfully initialized, -errno otherwise.
344  *
345  * This must be called *after* nfs_client_init_is_complete() returns true,
346  * otherwise it will pop WARN_ON_ONCE and return -EINVAL
347  */
348 int nfs_client_init_status(const struct nfs_client *clp)
349 {
350         /* called without checking nfs_client_init_is_complete */
351         if (clp->cl_cons_state > NFS_CS_READY) {
352                 WARN_ON_ONCE(1);
353                 return -EINVAL;
354         }
355         return clp->cl_cons_state;
356 }
357 EXPORT_SYMBOL_GPL(nfs_client_init_status);
358 
359 int nfs_wait_client_init_complete(const struct nfs_client *clp)
360 {
361         return wait_event_killable(nfs_client_active_wq,
362                         nfs_client_init_is_complete(clp));
363 }
364 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
365 
366 /*
367  * Found an existing client.  Make sure it's ready before returning.
368  */
369 static struct nfs_client *
370 nfs_found_client(const struct nfs_client_initdata *cl_init,
371                  struct nfs_client *clp)
372 {
373         int error;
374 
375         error = nfs_wait_client_init_complete(clp);
376         if (error < 0) {
377                 nfs_put_client(clp);
378                 return ERR_PTR(-ERESTARTSYS);
379         }
380 
381         if (clp->cl_cons_state < NFS_CS_READY) {
382                 error = clp->cl_cons_state;
383                 nfs_put_client(clp);
384                 return ERR_PTR(error);
385         }
386 
387         smp_rmb();
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         /* see if the client already exists */
407         do {
408                 spin_lock(&nn->nfs_client_lock);
409 
410                 clp = nfs_match_client(cl_init);
411                 if (clp) {
412                         spin_unlock(&nn->nfs_client_lock);
413                         if (IS_ERR(clp))
414                                 return clp;
415                         if (new)
416                                 new->rpc_ops->free_client(new);
417                         return nfs_found_client(cl_init, clp);
418                 }
419                 if (new) {
420                         list_add_tail(&new->cl_share_link,
421                                         &nn->nfs_client_list);
422                         spin_unlock(&nn->nfs_client_lock);
423                         new->cl_flags = cl_init->init_flags;
424                         return rpc_ops->init_client(new, cl_init);
425                 }
426 
427                 spin_unlock(&nn->nfs_client_lock);
428 
429                 new = rpc_ops->alloc_client(cl_init);
430         } while (!IS_ERR(new));
431 
432         return new;
433 }
434 EXPORT_SYMBOL_GPL(nfs_get_client);
435 
436 /*
437  * Mark a server as ready or failed
438  */
439 void nfs_mark_client_ready(struct nfs_client *clp, int state)
440 {
441         smp_wmb();
442         clp->cl_cons_state = state;
443         wake_up_all(&nfs_client_active_wq);
444 }
445 EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
446 
447 /*
448  * Initialise the timeout values for a connection
449  */
450 void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
451                                     int timeo, int retrans)
452 {
453         to->to_initval = timeo * HZ / 10;
454         to->to_retries = retrans;
455 
456         switch (proto) {
457         case XPRT_TRANSPORT_TCP:
458         case XPRT_TRANSPORT_RDMA:
459                 if (retrans == NFS_UNSPEC_RETRANS)
460                         to->to_retries = NFS_DEF_TCP_RETRANS;
461                 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
462                         to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
463                 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
464                         to->to_initval = NFS_MAX_TCP_TIMEOUT;
465                 to->to_increment = to->to_initval;
466                 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
467                 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
468                         to->to_maxval = NFS_MAX_TCP_TIMEOUT;
469                 if (to->to_maxval < to->to_initval)
470                         to->to_maxval = to->to_initval;
471                 to->to_exponential = 0;
472                 break;
473         case XPRT_TRANSPORT_UDP:
474                 if (retrans == NFS_UNSPEC_RETRANS)
475                         to->to_retries = NFS_DEF_UDP_RETRANS;
476                 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
477                         to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
478                 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
479                         to->to_initval = NFS_MAX_UDP_TIMEOUT;
480                 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
481                 to->to_exponential = 1;
482                 break;
483         default:
484                 BUG();
485         }
486 }
487 EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
488 
489 /*
490  * Create an RPC client handle
491  */
492 int nfs_create_rpc_client(struct nfs_client *clp,
493                           const struct nfs_client_initdata *cl_init,
494                           rpc_authflavor_t flavor)
495 {
496         struct rpc_clnt         *clnt = NULL;
497         struct rpc_create_args args = {
498                 .net            = clp->cl_net,
499                 .protocol       = clp->cl_proto,
500                 .address        = (struct sockaddr *)&clp->cl_addr,
501                 .addrsize       = clp->cl_addrlen,
502                 .timeout        = cl_init->timeparms,
503                 .servername     = clp->cl_hostname,
504                 .nodename       = cl_init->nodename,
505                 .program        = &nfs_program,
506                 .version        = clp->rpc_ops->version,
507                 .authflavor     = flavor,
508         };
509 
510         if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
511                 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
512         if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
513                 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
514         if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
515                 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
516         if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
517                 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
518 
519         if (!IS_ERR(clp->cl_rpcclient))
520                 return 0;
521 
522         clnt = rpc_create(&args);
523         if (IS_ERR(clnt)) {
524                 dprintk("%s: cannot create RPC client. Error = %ld\n",
525                                 __func__, PTR_ERR(clnt));
526                 return PTR_ERR(clnt);
527         }
528 
529         clnt->cl_principal = clp->cl_principal;
530         clp->cl_rpcclient = clnt;
531         return 0;
532 }
533 EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
534 
535 /*
536  * Version 2 or 3 client destruction
537  */
538 static void nfs_destroy_server(struct nfs_server *server)
539 {
540         if (server->nlm_host)
541                 nlmclnt_done(server->nlm_host);
542 }
543 
544 /*
545  * Version 2 or 3 lockd setup
546  */
547 static int nfs_start_lockd(struct nfs_server *server)
548 {
549         struct nlm_host *host;
550         struct nfs_client *clp = server->nfs_client;
551         struct nlmclnt_initdata nlm_init = {
552                 .hostname       = clp->cl_hostname,
553                 .address        = (struct sockaddr *)&clp->cl_addr,
554                 .addrlen        = clp->cl_addrlen,
555                 .nfs_version    = clp->rpc_ops->version,
556                 .noresvport     = server->flags & NFS_MOUNT_NORESVPORT ?
557                                         1 : 0,
558                 .net            = clp->cl_net,
559                 .nlmclnt_ops    = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
560         };
561 
562         if (nlm_init.nfs_version > 3)
563                 return 0;
564         if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
565                         (server->flags & NFS_MOUNT_LOCAL_FCNTL))
566                 return 0;
567 
568         switch (clp->cl_proto) {
569                 default:
570                         nlm_init.protocol = IPPROTO_TCP;
571                         break;
572                 case XPRT_TRANSPORT_UDP:
573                         nlm_init.protocol = IPPROTO_UDP;
574         }
575 
576         host = nlmclnt_init(&nlm_init);
577         if (IS_ERR(host))
578                 return PTR_ERR(host);
579 
580         server->nlm_host = host;
581         server->destroy = nfs_destroy_server;
582         return 0;
583 }
584 
585 /*
586  * Create a general RPC client
587  */
588 int nfs_init_server_rpcclient(struct nfs_server *server,
589                 const struct rpc_timeout *timeo,
590                 rpc_authflavor_t pseudoflavour)
591 {
592         struct nfs_client *clp = server->nfs_client;
593 
594         server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
595                                                         pseudoflavour);
596         if (IS_ERR(server->client)) {
597                 dprintk("%s: couldn't create rpc_client!\n", __func__);
598                 return PTR_ERR(server->client);
599         }
600 
601         memcpy(&server->client->cl_timeout_default,
602                         timeo,
603                         sizeof(server->client->cl_timeout_default));
604         server->client->cl_timeout = &server->client->cl_timeout_default;
605         server->client->cl_softrtry = 0;
606         if (server->flags & NFS_MOUNT_SOFT)
607                 server->client->cl_softrtry = 1;
608 
609         return 0;
610 }
611 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
612 
613 /**
614  * nfs_init_client - Initialise an NFS2 or NFS3 client
615  *
616  * @clp: nfs_client to initialise
617  * @cl_init: Initialisation parameters
618  *
619  * Returns pointer to an NFS client, or an ERR_PTR value.
620  */
621 struct nfs_client *nfs_init_client(struct nfs_client *clp,
622                                    const struct nfs_client_initdata *cl_init)
623 {
624         int error;
625 
626         /* the client is already initialised */
627         if (clp->cl_cons_state == NFS_CS_READY)
628                 return clp;
629 
630         /*
631          * Create a client RPC handle for doing FSSTAT with UNIX auth only
632          * - RFC 2623, sec 2.3.2
633          */
634         error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
635         nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
636         if (error < 0) {
637                 nfs_put_client(clp);
638                 clp = ERR_PTR(error);
639         }
640         return clp;
641 }
642 EXPORT_SYMBOL_GPL(nfs_init_client);
643 
644 /*
645  * Create a version 2 or 3 client
646  */
647 static int nfs_init_server(struct nfs_server *server,
648                            const struct nfs_parsed_mount_data *data,
649                            struct nfs_subversion *nfs_mod)
650 {
651         struct rpc_timeout timeparms;
652         struct nfs_client_initdata cl_init = {
653                 .hostname = data->nfs_server.hostname,
654                 .addr = (const struct sockaddr *)&data->nfs_server.address,
655                 .addrlen = data->nfs_server.addrlen,
656                 .nfs_mod = nfs_mod,
657                 .proto = data->nfs_server.protocol,
658                 .net = data->net,
659                 .timeparms = &timeparms,
660         };
661         struct nfs_client *clp;
662         int error;
663 
664         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
665                         data->timeo, data->retrans);
666         if (data->flags & NFS_MOUNT_NORESVPORT)
667                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
668 
669         /* Allocate or find a client reference we can use */
670         clp = nfs_get_client(&cl_init);
671         if (IS_ERR(clp))
672                 return PTR_ERR(clp);
673 
674         server->nfs_client = clp;
675 
676         /* Initialise the client representation from the mount data */
677         server->flags = data->flags;
678         server->options = data->options;
679         server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
680                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
681                 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
682 
683         if (data->rsize)
684                 server->rsize = nfs_block_size(data->rsize, NULL);
685         if (data->wsize)
686                 server->wsize = nfs_block_size(data->wsize, NULL);
687 
688         server->acregmin = data->acregmin * HZ;
689         server->acregmax = data->acregmax * HZ;
690         server->acdirmin = data->acdirmin * HZ;
691         server->acdirmax = data->acdirmax * HZ;
692 
693         /* Start lockd here, before we might error out */
694         error = nfs_start_lockd(server);
695         if (error < 0)
696                 goto error;
697 
698         server->port = data->nfs_server.port;
699         server->auth_info = data->auth_info;
700 
701         error = nfs_init_server_rpcclient(server, &timeparms,
702                                           data->selected_flavor);
703         if (error < 0)
704                 goto error;
705 
706         /* Preserve the values of mount_server-related mount options */
707         if (data->mount_server.addrlen) {
708                 memcpy(&server->mountd_address, &data->mount_server.address,
709                         data->mount_server.addrlen);
710                 server->mountd_addrlen = data->mount_server.addrlen;
711         }
712         server->mountd_version = data->mount_server.version;
713         server->mountd_port = data->mount_server.port;
714         server->mountd_protocol = data->mount_server.protocol;
715 
716         server->namelen  = data->namlen;
717         return 0;
718 
719 error:
720         server->nfs_client = NULL;
721         nfs_put_client(clp);
722         return error;
723 }
724 
725 /*
726  * Load up the server record from information gained in an fsinfo record
727  */
728 static void nfs_server_set_fsinfo(struct nfs_server *server,
729                                   struct nfs_fsinfo *fsinfo)
730 {
731         unsigned long max_rpc_payload;
732 
733         /* Work out a lot of parameters */
734         if (server->rsize == 0)
735                 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
736         if (server->wsize == 0)
737                 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
738 
739         if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
740                 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
741         if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
742                 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
743 
744         max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
745         if (server->rsize > max_rpc_payload)
746                 server->rsize = max_rpc_payload;
747         if (server->rsize > NFS_MAX_FILE_IO_SIZE)
748                 server->rsize = NFS_MAX_FILE_IO_SIZE;
749         server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
750 
751         if (server->wsize > max_rpc_payload)
752                 server->wsize = max_rpc_payload;
753         if (server->wsize > NFS_MAX_FILE_IO_SIZE)
754                 server->wsize = NFS_MAX_FILE_IO_SIZE;
755         server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
756 
757         server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
758 
759         server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
760         if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES)
761                 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES;
762         if (server->dtsize > server->rsize)
763                 server->dtsize = server->rsize;
764 
765         if (server->flags & NFS_MOUNT_NOAC) {
766                 server->acregmin = server->acregmax = 0;
767                 server->acdirmin = server->acdirmax = 0;
768         }
769 
770         server->maxfilesize = fsinfo->maxfilesize;
771 
772         server->time_delta = fsinfo->time_delta;
773 
774         server->clone_blksize = fsinfo->clone_blksize;
775         /* We're airborne Set socket buffersize */
776         rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
777 }
778 
779 /*
780  * Probe filesystem information, including the FSID on v2/v3
781  */
782 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
783 {
784         struct nfs_fsinfo fsinfo;
785         struct nfs_client *clp = server->nfs_client;
786         int error;
787 
788         if (clp->rpc_ops->set_capabilities != NULL) {
789                 error = clp->rpc_ops->set_capabilities(server, mntfh);
790                 if (error < 0)
791                         return error;
792         }
793 
794         fsinfo.fattr = fattr;
795         fsinfo.nlayouttypes = 0;
796         memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
797         error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
798         if (error < 0)
799                 return error;
800 
801         nfs_server_set_fsinfo(server, &fsinfo);
802 
803         /* Get some general file system info */
804         if (server->namelen == 0) {
805                 struct nfs_pathconf pathinfo;
806 
807                 pathinfo.fattr = fattr;
808                 nfs_fattr_init(fattr);
809 
810                 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
811                         server->namelen = pathinfo.max_namelen;
812         }
813 
814         return 0;
815 }
816 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
817 
818 /*
819  * Copy useful information when duplicating a server record
820  */
821 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
822 {
823         target->flags = source->flags;
824         target->rsize = source->rsize;
825         target->wsize = source->wsize;
826         target->acregmin = source->acregmin;
827         target->acregmax = source->acregmax;
828         target->acdirmin = source->acdirmin;
829         target->acdirmax = source->acdirmax;
830         target->caps = source->caps;
831         target->options = source->options;
832         target->auth_info = source->auth_info;
833         target->port = source->port;
834 }
835 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
836 
837 void nfs_server_insert_lists(struct nfs_server *server)
838 {
839         struct nfs_client *clp = server->nfs_client;
840         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
841 
842         spin_lock(&nn->nfs_client_lock);
843         list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
844         list_add_tail(&server->master_link, &nn->nfs_volume_list);
845         clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
846         spin_unlock(&nn->nfs_client_lock);
847 
848 }
849 EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
850 
851 void nfs_server_remove_lists(struct nfs_server *server)
852 {
853         struct nfs_client *clp = server->nfs_client;
854         struct nfs_net *nn;
855 
856         if (clp == NULL)
857                 return;
858         nn = net_generic(clp->cl_net, nfs_net_id);
859         spin_lock(&nn->nfs_client_lock);
860         list_del_rcu(&server->client_link);
861         if (list_empty(&clp->cl_superblocks))
862                 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
863         list_del(&server->master_link);
864         spin_unlock(&nn->nfs_client_lock);
865 
866         synchronize_rcu();
867 }
868 EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
869 
870 /*
871  * Allocate and initialise a server record
872  */
873 struct nfs_server *nfs_alloc_server(void)
874 {
875         struct nfs_server *server;
876 
877         server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
878         if (!server)
879                 return NULL;
880 
881         server->client = server->client_acl = ERR_PTR(-EINVAL);
882 
883         /* Zero out the NFS state stuff */
884         INIT_LIST_HEAD(&server->client_link);
885         INIT_LIST_HEAD(&server->master_link);
886         INIT_LIST_HEAD(&server->delegations);
887         INIT_LIST_HEAD(&server->layouts);
888         INIT_LIST_HEAD(&server->state_owners_lru);
889         INIT_LIST_HEAD(&server->ss_copies);
890 
891         atomic_set(&server->active, 0);
892 
893         server->io_stats = nfs_alloc_iostats();
894         if (!server->io_stats) {
895                 kfree(server);
896                 return NULL;
897         }
898 
899         ida_init(&server->openowner_id);
900         ida_init(&server->lockowner_id);
901         pnfs_init_server(server);
902         rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
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         nfs_server_remove_lists(server);
914 
915         if (server->destroy != NULL)
916                 server->destroy(server);
917 
918         if (!IS_ERR(server->client_acl))
919                 rpc_shutdown_client(server->client_acl);
920         if (!IS_ERR(server->client))
921                 rpc_shutdown_client(server->client);
922 
923         nfs_put_client(server->nfs_client);
924 
925         ida_destroy(&server->lockowner_id);
926         ida_destroy(&server->openowner_id);
927         nfs_free_iostats(server->io_stats);
928         kfree(server);
929         nfs_release_automount_timer();
930 }
931 EXPORT_SYMBOL_GPL(nfs_free_server);
932 
933 /*
934  * Create a version 2 or 3 volume record
935  * - keyed on server and FSID
936  */
937 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
938                                      struct nfs_subversion *nfs_mod)
939 {
940         struct nfs_server *server;
941         struct nfs_fattr *fattr;
942         int error;
943 
944         server = nfs_alloc_server();
945         if (!server)
946                 return ERR_PTR(-ENOMEM);
947 
948         error = -ENOMEM;
949         fattr = nfs_alloc_fattr();
950         if (fattr == NULL)
951                 goto error;
952 
953         /* Get a client representation */
954         error = nfs_init_server(server, mount_info->parsed, nfs_mod);
955         if (error < 0)
956                 goto error;
957 
958         /* Probe the root fh to retrieve its FSID */
959         error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
960         if (error < 0)
961                 goto error;
962         if (server->nfs_client->rpc_ops->version == 3) {
963                 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
964                         server->namelen = NFS3_MAXNAMLEN;
965                 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
966                         server->caps |= NFS_CAP_READDIRPLUS;
967         } else {
968                 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
969                         server->namelen = NFS2_MAXNAMLEN;
970         }
971 
972         if (!(fattr->valid & NFS_ATTR_FATTR)) {
973                 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh,
974                                 fattr, NULL, NULL);
975                 if (error < 0) {
976                         dprintk("nfs_create_server: getattr error = %d\n", -error);
977                         goto error;
978                 }
979         }
980         memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
981 
982         dprintk("Server FSID: %llx:%llx\n",
983                 (unsigned long long) server->fsid.major,
984                 (unsigned long long) server->fsid.minor);
985 
986         nfs_server_insert_lists(server);
987         server->mount_time = jiffies;
988         nfs_free_fattr(fattr);
989         return server;
990 
991 error:
992         nfs_free_fattr(fattr);
993         nfs_free_server(server);
994         return ERR_PTR(error);
995 }
996 EXPORT_SYMBOL_GPL(nfs_create_server);
997 
998 /*
999  * Clone an NFS2, NFS3 or NFS4 server record
1000  */
1001 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1002                                     struct nfs_fh *fh,
1003                                     struct nfs_fattr *fattr,
1004                                     rpc_authflavor_t flavor)
1005 {
1006         struct nfs_server *server;
1007         struct nfs_fattr *fattr_fsinfo;
1008         int error;
1009 
1010         server = nfs_alloc_server();
1011         if (!server)
1012                 return ERR_PTR(-ENOMEM);
1013 
1014         error = -ENOMEM;
1015         fattr_fsinfo = nfs_alloc_fattr();
1016         if (fattr_fsinfo == NULL)
1017                 goto out_free_server;
1018 
1019         /* Copy data from the source */
1020         server->nfs_client = source->nfs_client;
1021         server->destroy = source->destroy;
1022         refcount_inc(&server->nfs_client->cl_count);
1023         nfs_server_copy_userdata(server, source);
1024 
1025         server->fsid = fattr->fsid;
1026 
1027         error = nfs_init_server_rpcclient(server,
1028                         source->client->cl_timeout,
1029                         flavor);
1030         if (error < 0)
1031                 goto out_free_server;
1032 
1033         /* probe the filesystem info for this server filesystem */
1034         error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1035         if (error < 0)
1036                 goto out_free_server;
1037 
1038         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1039                 server->namelen = NFS4_MAXNAMLEN;
1040 
1041         error = nfs_start_lockd(server);
1042         if (error < 0)
1043                 goto out_free_server;
1044 
1045         nfs_server_insert_lists(server);
1046         server->mount_time = jiffies;
1047 
1048         nfs_free_fattr(fattr_fsinfo);
1049         return server;
1050 
1051 out_free_server:
1052         nfs_free_fattr(fattr_fsinfo);
1053         nfs_free_server(server);
1054         return ERR_PTR(error);
1055 }
1056 EXPORT_SYMBOL_GPL(nfs_clone_server);
1057 
1058 void nfs_clients_init(struct net *net)
1059 {
1060         struct nfs_net *nn = net_generic(net, nfs_net_id);
1061 
1062         INIT_LIST_HEAD(&nn->nfs_client_list);
1063         INIT_LIST_HEAD(&nn->nfs_volume_list);
1064 #if IS_ENABLED(CONFIG_NFS_V4)
1065         idr_init(&nn->cb_ident_idr);
1066 #endif
1067         spin_lock_init(&nn->nfs_client_lock);
1068         nn->boot_time = ktime_get_real();
1069 }
1070 
1071 #ifdef CONFIG_PROC_FS
1072 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1073 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1074 static void nfs_server_list_stop(struct seq_file *p, void *v);
1075 static int nfs_server_list_show(struct seq_file *m, void *v);
1076 
1077 static const struct seq_operations nfs_server_list_ops = {
1078         .start  = nfs_server_list_start,
1079         .next   = nfs_server_list_next,
1080         .stop   = nfs_server_list_stop,
1081         .show   = nfs_server_list_show,
1082 };
1083 
1084 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1085 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1086 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1087 static int nfs_volume_list_show(struct seq_file *m, void *v);
1088 
1089 static const struct seq_operations nfs_volume_list_ops = {
1090         .start  = nfs_volume_list_start,
1091         .next   = nfs_volume_list_next,
1092         .stop   = nfs_volume_list_stop,
1093         .show   = nfs_volume_list_show,
1094 };
1095 
1096 /*
1097  * set up the iterator to start reading from the server list and return the first item
1098  */
1099 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1100                                 __acquires(&nn->nfs_client_lock)
1101 {
1102         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1103 
1104         /* lock the list against modification */
1105         spin_lock(&nn->nfs_client_lock);
1106         return seq_list_start_head(&nn->nfs_client_list, *_pos);
1107 }
1108 
1109 /*
1110  * move to next server
1111  */
1112 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1113 {
1114         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1115 
1116         return seq_list_next(v, &nn->nfs_client_list, pos);
1117 }
1118 
1119 /*
1120  * clean up after reading from the transports list
1121  */
1122 static void nfs_server_list_stop(struct seq_file *p, void *v)
1123                                 __releases(&nn->nfs_client_lock)
1124 {
1125         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1126 
1127         spin_unlock(&nn->nfs_client_lock);
1128 }
1129 
1130 /*
1131  * display a header line followed by a load of call lines
1132  */
1133 static int nfs_server_list_show(struct seq_file *m, void *v)
1134 {
1135         struct nfs_client *clp;
1136         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1137 
1138         /* display header on line 1 */
1139         if (v == &nn->nfs_client_list) {
1140                 seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
1141                 return 0;
1142         }
1143 
1144         /* display one transport per line on subsequent lines */
1145         clp = list_entry(v, struct nfs_client, cl_share_link);
1146 
1147         /* Check if the client is initialized */
1148         if (clp->cl_cons_state != NFS_CS_READY)
1149                 return 0;
1150 
1151         rcu_read_lock();
1152         seq_printf(m, "v%u %s %s %3d %s\n",
1153                    clp->rpc_ops->version,
1154                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1155                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1156                    refcount_read(&clp->cl_count),
1157                    clp->cl_hostname);
1158         rcu_read_unlock();
1159 
1160         return 0;
1161 }
1162 
1163 /*
1164  * set up the iterator to start reading from the volume list and return the first item
1165  */
1166 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1167                                 __acquires(&nn->nfs_client_lock)
1168 {
1169         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1170 
1171         /* lock the list against modification */
1172         spin_lock(&nn->nfs_client_lock);
1173         return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1174 }
1175 
1176 /*
1177  * move to next volume
1178  */
1179 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1180 {
1181         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1182 
1183         return seq_list_next(v, &nn->nfs_volume_list, pos);
1184 }
1185 
1186 /*
1187  * clean up after reading from the transports list
1188  */
1189 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1190                                 __releases(&nn->nfs_client_lock)
1191 {
1192         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1193 
1194         spin_unlock(&nn->nfs_client_lock);
1195 }
1196 
1197 /*
1198  * display a header line followed by a load of call lines
1199  */
1200 static int nfs_volume_list_show(struct seq_file *m, void *v)
1201 {
1202         struct nfs_server *server;
1203         struct nfs_client *clp;
1204         char dev[13];   // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1205         char fsid[34];  // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1206         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1207 
1208         /* display header on line 1 */
1209         if (v == &nn->nfs_volume_list) {
1210                 seq_puts(m, "NV SERVER   PORT DEV          FSID"
1211                             "                              FSC\n");
1212                 return 0;
1213         }
1214         /* display one transport per line on subsequent lines */
1215         server = list_entry(v, struct nfs_server, master_link);
1216         clp = server->nfs_client;
1217 
1218         snprintf(dev, sizeof(dev), "%u:%u",
1219                  MAJOR(server->s_dev), MINOR(server->s_dev));
1220 
1221         snprintf(fsid, sizeof(fsid), "%llx:%llx",
1222                  (unsigned long long) server->fsid.major,
1223                  (unsigned long long) server->fsid.minor);
1224 
1225         rcu_read_lock();
1226         seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1227                    clp->rpc_ops->version,
1228                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1229                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1230                    dev,
1231                    fsid,
1232                    nfs_server_fscache_state(server));
1233         rcu_read_unlock();
1234 
1235         return 0;
1236 }
1237 
1238 int nfs_fs_proc_net_init(struct net *net)
1239 {
1240         struct nfs_net *nn = net_generic(net, nfs_net_id);
1241         struct proc_dir_entry *p;
1242 
1243         nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1244         if (!nn->proc_nfsfs)
1245                 goto error_0;
1246 
1247         /* a file of servers with which we're dealing */
1248         p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1249                         &nfs_server_list_ops, sizeof(struct seq_net_private));
1250         if (!p)
1251                 goto error_1;
1252 
1253         /* a file of volumes that we have mounted */
1254         p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1255                         &nfs_volume_list_ops, sizeof(struct seq_net_private));
1256         if (!p)
1257                 goto error_1;
1258         return 0;
1259 
1260 error_1:
1261         remove_proc_subtree("nfsfs", net->proc_net);
1262 error_0:
1263         return -ENOMEM;
1264 }
1265 
1266 void nfs_fs_proc_net_exit(struct net *net)
1267 {
1268         remove_proc_subtree("nfsfs", net->proc_net);
1269 }
1270 
1271 /*
1272  * initialise the /proc/fs/nfsfs/ directory
1273  */
1274 int __init nfs_fs_proc_init(void)
1275 {
1276         if (!proc_mkdir("fs/nfsfs", NULL))
1277                 goto error_0;
1278 
1279         /* a file of servers with which we're dealing */
1280         if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1281                 goto error_1;
1282 
1283         /* a file of volumes that we have mounted */
1284         if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1285                 goto error_1;
1286 
1287         return 0;
1288 error_1:
1289         remove_proc_subtree("fs/nfsfs", NULL);
1290 error_0:
1291         return -ENOMEM;
1292 }
1293 
1294 /*
1295  * clean up the /proc/fs/nfsfs/ directory
1296  */
1297 void nfs_fs_proc_exit(void)
1298 {
1299         remove_proc_subtree("fs/nfsfs", NULL);
1300 }
1301 
1302 #endif /* CONFIG_PROC_FS */
1303 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp