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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/clnt.h>
 24 #include <linux/sunrpc/stats.h>
 25 #include <linux/sunrpc/metrics.h>
 26 #include <linux/sunrpc/xprtsock.h>
 27 #include <linux/sunrpc/xprtrdma.h>
 28 #include <linux/nfs_fs.h>
 29 #include <linux/nfs_mount.h>
 30 #include <linux/nfs4_mount.h>
 31 #include <linux/lockd/bind.h>
 32 #include <linux/seq_file.h>
 33 #include <linux/mount.h>
 34 #include <linux/nfs_idmap.h>
 35 #include <linux/vfs.h>
 36 #include <linux/inet.h>
 37 #include <linux/in6.h>
 38 #include <linux/slab.h>
 39 #include <linux/idr.h>
 40 #include <net/ipv6.h>
 41 #include <linux/nfs_xdr.h>
 42 #include <linux/sunrpc/bc_xprt.h>
 43 #include <linux/nsproxy.h>
 44 #include <linux/pid_namespace.h>
 45 
 46 
 47 #include "nfs4_fs.h"
 48 #include "callback.h"
 49 #include "delegation.h"
 50 #include "iostat.h"
 51 #include "internal.h"
 52 #include "fscache.h"
 53 #include "pnfs.h"
 54 #include "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 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
290 /*
291  * Test if two ip6 socket addresses refer to the same socket by
292  * comparing relevant fields. The padding bytes specifically, are not
293  * compared. sin6_flowinfo is not compared because it only affects QoS
294  * and sin6_scope_id is only compared if the address is "link local"
295  * because "link local" addresses need only be unique to a specific
296  * link. Conversely, ordinary unicast addresses might have different
297  * sin6_scope_id.
298  *
299  * The caller should ensure both socket addresses are AF_INET6.
300  */
301 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
302                                       const struct sockaddr *sa2)
303 {
304         const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
305         const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
306 
307         if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
308                 return 0;
309         else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
310                 return sin1->sin6_scope_id == sin2->sin6_scope_id;
311 
312         return 1;
313 }
314 #else   /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
315 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
316                                       const struct sockaddr *sa2)
317 {
318         return 0;
319 }
320 #endif
321 
322 /*
323  * Test if two ip4 socket addresses refer to the same socket, by
324  * comparing relevant fields. The padding bytes specifically, are
325  * not compared.
326  *
327  * The caller should ensure both socket addresses are AF_INET.
328  */
329 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
330                                       const struct sockaddr *sa2)
331 {
332         const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
333         const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
334 
335         return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
336 }
337 
338 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
339                                 const struct sockaddr *sa2)
340 {
341         const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
342         const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
343 
344         return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
345                 (sin1->sin6_port == sin2->sin6_port);
346 }
347 
348 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
349                                 const struct sockaddr *sa2)
350 {
351         const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
352         const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
353 
354         return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
355                 (sin1->sin_port == sin2->sin_port);
356 }
357 
358 #if defined(CONFIG_NFS_V4_1)
359 /*
360  * Test if two socket addresses represent the same actual socket,
361  * by comparing (only) relevant fields, excluding the port number.
362  */
363 int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
364                               const struct sockaddr *sa2)
365 {
366         if (sa1->sa_family != sa2->sa_family)
367                 return 0;
368 
369         switch (sa1->sa_family) {
370         case AF_INET:
371                 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
372         case AF_INET6:
373                 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
374         }
375         return 0;
376 }
377 EXPORT_SYMBOL_GPL(nfs_sockaddr_match_ipaddr);
378 #endif /* CONFIG_NFS_V4_1 */
379 
380 /*
381  * Test if two socket addresses represent the same actual socket,
382  * by comparing (only) relevant fields, including the port number.
383  */
384 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
385                             const struct sockaddr *sa2)
386 {
387         if (sa1->sa_family != sa2->sa_family)
388                 return 0;
389 
390         switch (sa1->sa_family) {
391         case AF_INET:
392                 return nfs_sockaddr_cmp_ip4(sa1, sa2);
393         case AF_INET6:
394                 return nfs_sockaddr_cmp_ip6(sa1, sa2);
395         }
396         return 0;
397 }
398 
399 /*
400  * Find an nfs_client on the list that matches the initialisation data
401  * that is supplied.
402  */
403 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
404 {
405         struct nfs_client *clp;
406         const struct sockaddr *sap = data->addr;
407         struct nfs_net *nn = net_generic(data->net, nfs_net_id);
408 
409         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
410                 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
411                 /* Don't match clients that failed to initialise properly */
412                 if (clp->cl_cons_state < 0)
413                         continue;
414 
415                 /* Different NFS versions cannot share the same nfs_client */
416                 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
417                         continue;
418 
419                 if (clp->cl_proto != data->proto)
420                         continue;
421                 /* Match nfsv4 minorversion */
422                 if (clp->cl_minorversion != data->minorversion)
423                         continue;
424                 /* Match the full socket address */
425                 if (!nfs_sockaddr_cmp(sap, clap))
426                         continue;
427 
428                 atomic_inc(&clp->cl_count);
429                 return clp;
430         }
431         return NULL;
432 }
433 
434 static bool nfs_client_init_is_complete(const struct nfs_client *clp)
435 {
436         return clp->cl_cons_state != NFS_CS_INITING;
437 }
438 
439 int nfs_wait_client_init_complete(const struct nfs_client *clp)
440 {
441         return wait_event_killable(nfs_client_active_wq,
442                         nfs_client_init_is_complete(clp));
443 }
444 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
445 
446 /*
447  * Found an existing client.  Make sure it's ready before returning.
448  */
449 static struct nfs_client *
450 nfs_found_client(const struct nfs_client_initdata *cl_init,
451                  struct nfs_client *clp)
452 {
453         int error;
454 
455         error = nfs_wait_client_init_complete(clp);
456         if (error < 0) {
457                 nfs_put_client(clp);
458                 return ERR_PTR(-ERESTARTSYS);
459         }
460 
461         if (clp->cl_cons_state < NFS_CS_READY) {
462                 error = clp->cl_cons_state;
463                 nfs_put_client(clp);
464                 return ERR_PTR(error);
465         }
466 
467         smp_rmb();
468 
469         dprintk("<-- %s found nfs_client %p for %s\n",
470                 __func__, clp, cl_init->hostname ?: "");
471         return clp;
472 }
473 
474 /*
475  * Look up a client by IP address and protocol version
476  * - creates a new record if one doesn't yet exist
477  */
478 struct nfs_client *
479 nfs_get_client(const struct nfs_client_initdata *cl_init,
480                const struct rpc_timeout *timeparms,
481                const char *ip_addr,
482                rpc_authflavor_t authflavour)
483 {
484         struct nfs_client *clp, *new = NULL;
485         struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
486         const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
487 
488         if (cl_init->hostname == NULL) {
489                 WARN_ON(1);
490                 return NULL;
491         }
492 
493         dprintk("--> nfs_get_client(%s,v%u)\n",
494                 cl_init->hostname, rpc_ops->version);
495 
496         /* see if the client already exists */
497         do {
498                 spin_lock(&nn->nfs_client_lock);
499 
500                 clp = nfs_match_client(cl_init);
501                 if (clp) {
502                         spin_unlock(&nn->nfs_client_lock);
503                         if (new)
504                                 new->rpc_ops->free_client(new);
505                         return nfs_found_client(cl_init, clp);
506                 }
507                 if (new) {
508                         list_add_tail(&new->cl_share_link,
509                                         &nn->nfs_client_list);
510                         spin_unlock(&nn->nfs_client_lock);
511                         new->cl_flags = cl_init->init_flags;
512                         return rpc_ops->init_client(new, timeparms, ip_addr);
513                 }
514 
515                 spin_unlock(&nn->nfs_client_lock);
516 
517                 new = rpc_ops->alloc_client(cl_init);
518         } while (!IS_ERR(new));
519 
520         dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
521                 cl_init->hostname, PTR_ERR(new));
522         return new;
523 }
524 EXPORT_SYMBOL_GPL(nfs_get_client);
525 
526 /*
527  * Mark a server as ready or failed
528  */
529 void nfs_mark_client_ready(struct nfs_client *clp, int state)
530 {
531         smp_wmb();
532         clp->cl_cons_state = state;
533         wake_up_all(&nfs_client_active_wq);
534 }
535 EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
536 
537 /*
538  * Initialise the timeout values for a connection
539  */
540 void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
541                                     unsigned int timeo, unsigned int retrans)
542 {
543         to->to_initval = timeo * HZ / 10;
544         to->to_retries = retrans;
545 
546         switch (proto) {
547         case XPRT_TRANSPORT_TCP:
548         case XPRT_TRANSPORT_RDMA:
549                 if (to->to_retries == 0)
550                         to->to_retries = NFS_DEF_TCP_RETRANS;
551                 if (to->to_initval == 0)
552                         to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
553                 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
554                         to->to_initval = NFS_MAX_TCP_TIMEOUT;
555                 to->to_increment = to->to_initval;
556                 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
557                 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
558                         to->to_maxval = NFS_MAX_TCP_TIMEOUT;
559                 if (to->to_maxval < to->to_initval)
560                         to->to_maxval = to->to_initval;
561                 to->to_exponential = 0;
562                 break;
563         case XPRT_TRANSPORT_UDP:
564                 if (to->to_retries == 0)
565                         to->to_retries = NFS_DEF_UDP_RETRANS;
566                 if (!to->to_initval)
567                         to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
568                 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
569                         to->to_initval = NFS_MAX_UDP_TIMEOUT;
570                 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
571                 to->to_exponential = 1;
572                 break;
573         default:
574                 BUG();
575         }
576 }
577 EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
578 
579 /*
580  * Create an RPC client handle
581  */
582 int nfs_create_rpc_client(struct nfs_client *clp,
583                           const struct rpc_timeout *timeparms,
584                           rpc_authflavor_t flavor)
585 {
586         struct rpc_clnt         *clnt = NULL;
587         struct rpc_create_args args = {
588                 .net            = clp->cl_net,
589                 .protocol       = clp->cl_proto,
590                 .address        = (struct sockaddr *)&clp->cl_addr,
591                 .addrsize       = clp->cl_addrlen,
592                 .timeout        = timeparms,
593                 .servername     = clp->cl_hostname,
594                 .program        = &nfs_program,
595                 .version        = clp->rpc_ops->version,
596                 .authflavor     = flavor,
597         };
598 
599         if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
600                 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
601         if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
602                 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
603         if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
604                 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
605         if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
606                 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
607 
608         if (!IS_ERR(clp->cl_rpcclient))
609                 return 0;
610 
611         clnt = rpc_create(&args);
612         if (IS_ERR(clnt)) {
613                 dprintk("%s: cannot create RPC client. Error = %ld\n",
614                                 __func__, PTR_ERR(clnt));
615                 return PTR_ERR(clnt);
616         }
617 
618         clp->cl_rpcclient = clnt;
619         return 0;
620 }
621 EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
622 
623 /*
624  * Version 2 or 3 client destruction
625  */
626 static void nfs_destroy_server(struct nfs_server *server)
627 {
628         if (server->nlm_host)
629                 nlmclnt_done(server->nlm_host);
630 }
631 
632 /*
633  * Version 2 or 3 lockd setup
634  */
635 static int nfs_start_lockd(struct nfs_server *server)
636 {
637         struct nlm_host *host;
638         struct nfs_client *clp = server->nfs_client;
639         struct nlmclnt_initdata nlm_init = {
640                 .hostname       = clp->cl_hostname,
641                 .address        = (struct sockaddr *)&clp->cl_addr,
642                 .addrlen        = clp->cl_addrlen,
643                 .nfs_version    = clp->rpc_ops->version,
644                 .noresvport     = server->flags & NFS_MOUNT_NORESVPORT ?
645                                         1 : 0,
646                 .net            = clp->cl_net,
647         };
648 
649         if (nlm_init.nfs_version > 3)
650                 return 0;
651         if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
652                         (server->flags & NFS_MOUNT_LOCAL_FCNTL))
653                 return 0;
654 
655         switch (clp->cl_proto) {
656                 default:
657                         nlm_init.protocol = IPPROTO_TCP;
658                         break;
659                 case XPRT_TRANSPORT_UDP:
660                         nlm_init.protocol = IPPROTO_UDP;
661         }
662 
663         host = nlmclnt_init(&nlm_init);
664         if (IS_ERR(host))
665                 return PTR_ERR(host);
666 
667         server->nlm_host = host;
668         server->destroy = nfs_destroy_server;
669         return 0;
670 }
671 
672 /*
673  * Create a general RPC client
674  */
675 int nfs_init_server_rpcclient(struct nfs_server *server,
676                 const struct rpc_timeout *timeo,
677                 rpc_authflavor_t pseudoflavour)
678 {
679         struct nfs_client *clp = server->nfs_client;
680 
681         server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
682                                                         pseudoflavour);
683         if (IS_ERR(server->client)) {
684                 dprintk("%s: couldn't create rpc_client!\n", __func__);
685                 return PTR_ERR(server->client);
686         }
687 
688         memcpy(&server->client->cl_timeout_default,
689                         timeo,
690                         sizeof(server->client->cl_timeout_default));
691         server->client->cl_timeout = &server->client->cl_timeout_default;
692         server->client->cl_softrtry = 0;
693         if (server->flags & NFS_MOUNT_SOFT)
694                 server->client->cl_softrtry = 1;
695 
696         return 0;
697 }
698 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
699 
700 /**
701  * nfs_init_client - Initialise an NFS2 or NFS3 client
702  *
703  * @clp: nfs_client to initialise
704  * @timeparms: timeout parameters for underlying RPC transport
705  * @ip_addr: IP presentation address (not used)
706  *
707  * Returns pointer to an NFS client, or an ERR_PTR value.
708  */
709 struct nfs_client *nfs_init_client(struct nfs_client *clp,
710                     const struct rpc_timeout *timeparms,
711                     const char *ip_addr)
712 {
713         int error;
714 
715         if (clp->cl_cons_state == NFS_CS_READY) {
716                 /* the client is already initialised */
717                 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
718                 return clp;
719         }
720 
721         /*
722          * Create a client RPC handle for doing FSSTAT with UNIX auth only
723          * - RFC 2623, sec 2.3.2
724          */
725         error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
726         if (error < 0)
727                 goto error;
728         nfs_mark_client_ready(clp, NFS_CS_READY);
729         return clp;
730 
731 error:
732         nfs_mark_client_ready(clp, error);
733         nfs_put_client(clp);
734         dprintk("<-- nfs_init_client() = xerror %d\n", error);
735         return ERR_PTR(error);
736 }
737 EXPORT_SYMBOL_GPL(nfs_init_client);
738 
739 /*
740  * Create a version 2 or 3 client
741  */
742 static int nfs_init_server(struct nfs_server *server,
743                            const struct nfs_parsed_mount_data *data,
744                            struct nfs_subversion *nfs_mod)
745 {
746         struct nfs_client_initdata cl_init = {
747                 .hostname = data->nfs_server.hostname,
748                 .addr = (const struct sockaddr *)&data->nfs_server.address,
749                 .addrlen = data->nfs_server.addrlen,
750                 .nfs_mod = nfs_mod,
751                 .proto = data->nfs_server.protocol,
752                 .net = data->net,
753         };
754         struct rpc_timeout timeparms;
755         struct nfs_client *clp;
756         int error;
757 
758         dprintk("--> nfs_init_server()\n");
759 
760         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
761                         data->timeo, data->retrans);
762         if (data->flags & NFS_MOUNT_NORESVPORT)
763                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
764 
765         /* Allocate or find a client reference we can use */
766         clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX);
767         if (IS_ERR(clp)) {
768                 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
769                 return PTR_ERR(clp);
770         }
771 
772         server->nfs_client = clp;
773 
774         /* Initialise the client representation from the mount data */
775         server->flags = data->flags;
776         server->options = data->options;
777         server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
778                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
779                 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
780 
781         if (data->rsize)
782                 server->rsize = nfs_block_size(data->rsize, NULL);
783         if (data->wsize)
784                 server->wsize = nfs_block_size(data->wsize, NULL);
785 
786         server->acregmin = data->acregmin * HZ;
787         server->acregmax = data->acregmax * HZ;
788         server->acdirmin = data->acdirmin * HZ;
789         server->acdirmax = data->acdirmax * HZ;
790 
791         /* Start lockd here, before we might error out */
792         error = nfs_start_lockd(server);
793         if (error < 0)
794                 goto error;
795 
796         server->port = data->nfs_server.port;
797         server->auth_info = data->auth_info;
798 
799         error = nfs_init_server_rpcclient(server, &timeparms,
800                                           data->selected_flavor);
801         if (error < 0)
802                 goto error;
803 
804         /* Preserve the values of mount_server-related mount options */
805         if (data->mount_server.addrlen) {
806                 memcpy(&server->mountd_address, &data->mount_server.address,
807                         data->mount_server.addrlen);
808                 server->mountd_addrlen = data->mount_server.addrlen;
809         }
810         server->mountd_version = data->mount_server.version;
811         server->mountd_port = data->mount_server.port;
812         server->mountd_protocol = data->mount_server.protocol;
813 
814         server->namelen  = data->namlen;
815         dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
816         return 0;
817 
818 error:
819         server->nfs_client = NULL;
820         nfs_put_client(clp);
821         dprintk("<-- nfs_init_server() = xerror %d\n", error);
822         return error;
823 }
824 
825 /*
826  * Load up the server record from information gained in an fsinfo record
827  */
828 static void nfs_server_set_fsinfo(struct nfs_server *server,
829                                   struct nfs_fh *mntfh,
830                                   struct nfs_fsinfo *fsinfo)
831 {
832         unsigned long max_rpc_payload;
833 
834         /* Work out a lot of parameters */
835         if (server->rsize == 0)
836                 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
837         if (server->wsize == 0)
838                 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
839 
840         if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
841                 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
842         if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
843                 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
844 
845         max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
846         if (server->rsize > max_rpc_payload)
847                 server->rsize = max_rpc_payload;
848         if (server->rsize > NFS_MAX_FILE_IO_SIZE)
849                 server->rsize = NFS_MAX_FILE_IO_SIZE;
850         server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
851 
852         server->backing_dev_info.name = "nfs";
853         server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
854 
855         if (server->wsize > max_rpc_payload)
856                 server->wsize = max_rpc_payload;
857         if (server->wsize > NFS_MAX_FILE_IO_SIZE)
858                 server->wsize = NFS_MAX_FILE_IO_SIZE;
859         server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
860 
861         server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
862 
863         server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
864         if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
865                 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
866         if (server->dtsize > server->rsize)
867                 server->dtsize = server->rsize;
868 
869         if (server->flags & NFS_MOUNT_NOAC) {
870                 server->acregmin = server->acregmax = 0;
871                 server->acdirmin = server->acdirmax = 0;
872         }
873 
874         server->maxfilesize = fsinfo->maxfilesize;
875 
876         server->time_delta = fsinfo->time_delta;
877 
878         /* We're airborne Set socket buffersize */
879         rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
880 }
881 
882 /*
883  * Probe filesystem information, including the FSID on v2/v3
884  */
885 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
886 {
887         struct nfs_fsinfo fsinfo;
888         struct nfs_client *clp = server->nfs_client;
889         int error;
890 
891         dprintk("--> nfs_probe_fsinfo()\n");
892 
893         if (clp->rpc_ops->set_capabilities != NULL) {
894                 error = clp->rpc_ops->set_capabilities(server, mntfh);
895                 if (error < 0)
896                         goto out_error;
897         }
898 
899         fsinfo.fattr = fattr;
900         fsinfo.layouttype = 0;
901         error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
902         if (error < 0)
903                 goto out_error;
904 
905         nfs_server_set_fsinfo(server, mntfh, &fsinfo);
906 
907         /* Get some general file system info */
908         if (server->namelen == 0) {
909                 struct nfs_pathconf pathinfo;
910 
911                 pathinfo.fattr = fattr;
912                 nfs_fattr_init(fattr);
913 
914                 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
915                         server->namelen = pathinfo.max_namelen;
916         }
917 
918         dprintk("<-- nfs_probe_fsinfo() = 0\n");
919         return 0;
920 
921 out_error:
922         dprintk("nfs_probe_fsinfo: error = %d\n", -error);
923         return error;
924 }
925 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
926 
927 /*
928  * Copy useful information when duplicating a server record
929  */
930 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
931 {
932         target->flags = source->flags;
933         target->rsize = source->rsize;
934         target->wsize = source->wsize;
935         target->acregmin = source->acregmin;
936         target->acregmax = source->acregmax;
937         target->acdirmin = source->acdirmin;
938         target->acdirmax = source->acdirmax;
939         target->caps = source->caps;
940         target->options = source->options;
941         target->auth_info = source->auth_info;
942 }
943 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
944 
945 void nfs_server_insert_lists(struct nfs_server *server)
946 {
947         struct nfs_client *clp = server->nfs_client;
948         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
949 
950         spin_lock(&nn->nfs_client_lock);
951         list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
952         list_add_tail(&server->master_link, &nn->nfs_volume_list);
953         clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
954         spin_unlock(&nn->nfs_client_lock);
955 
956 }
957 EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
958 
959 void nfs_server_remove_lists(struct nfs_server *server)
960 {
961         struct nfs_client *clp = server->nfs_client;
962         struct nfs_net *nn;
963 
964         if (clp == NULL)
965                 return;
966         nn = net_generic(clp->cl_net, nfs_net_id);
967         spin_lock(&nn->nfs_client_lock);
968         list_del_rcu(&server->client_link);
969         if (list_empty(&clp->cl_superblocks))
970                 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
971         list_del(&server->master_link);
972         spin_unlock(&nn->nfs_client_lock);
973 
974         synchronize_rcu();
975 }
976 EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
977 
978 /*
979  * Allocate and initialise a server record
980  */
981 struct nfs_server *nfs_alloc_server(void)
982 {
983         struct nfs_server *server;
984 
985         server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
986         if (!server)
987                 return NULL;
988 
989         server->client = server->client_acl = ERR_PTR(-EINVAL);
990 
991         /* Zero out the NFS state stuff */
992         INIT_LIST_HEAD(&server->client_link);
993         INIT_LIST_HEAD(&server->master_link);
994         INIT_LIST_HEAD(&server->delegations);
995         INIT_LIST_HEAD(&server->layouts);
996         INIT_LIST_HEAD(&server->state_owners_lru);
997 
998         atomic_set(&server->active, 0);
999 
1000         server->io_stats = nfs_alloc_iostats();
1001         if (!server->io_stats) {
1002                 kfree(server);
1003                 return NULL;
1004         }
1005 
1006         if (bdi_init(&server->backing_dev_info)) {
1007                 nfs_free_iostats(server->io_stats);
1008                 kfree(server);
1009                 return NULL;
1010         }
1011 
1012         ida_init(&server->openowner_id);
1013         ida_init(&server->lockowner_id);
1014         pnfs_init_server(server);
1015 
1016         return server;
1017 }
1018 EXPORT_SYMBOL_GPL(nfs_alloc_server);
1019 
1020 /*
1021  * Free up a server record
1022  */
1023 void nfs_free_server(struct nfs_server *server)
1024 {
1025         dprintk("--> nfs_free_server()\n");
1026 
1027         nfs_server_remove_lists(server);
1028 
1029         if (server->destroy != NULL)
1030                 server->destroy(server);
1031 
1032         if (!IS_ERR(server->client_acl))
1033                 rpc_shutdown_client(server->client_acl);
1034         if (!IS_ERR(server->client))
1035                 rpc_shutdown_client(server->client);
1036 
1037         nfs_put_client(server->nfs_client);
1038 
1039         ida_destroy(&server->lockowner_id);
1040         ida_destroy(&server->openowner_id);
1041         nfs_free_iostats(server->io_stats);
1042         bdi_destroy(&server->backing_dev_info);
1043         kfree(server);
1044         nfs_release_automount_timer();
1045         dprintk("<-- nfs_free_server()\n");
1046 }
1047 EXPORT_SYMBOL_GPL(nfs_free_server);
1048 
1049 /*
1050  * Create a version 2 or 3 volume record
1051  * - keyed on server and FSID
1052  */
1053 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
1054                                      struct nfs_subversion *nfs_mod)
1055 {
1056         struct nfs_server *server;
1057         struct nfs_fattr *fattr;
1058         int error;
1059 
1060         server = nfs_alloc_server();
1061         if (!server)
1062                 return ERR_PTR(-ENOMEM);
1063 
1064         error = -ENOMEM;
1065         fattr = nfs_alloc_fattr();
1066         if (fattr == NULL)
1067                 goto error;
1068 
1069         /* Get a client representation */
1070         error = nfs_init_server(server, mount_info->parsed, nfs_mod);
1071         if (error < 0)
1072                 goto error;
1073 
1074         /* Probe the root fh to retrieve its FSID */
1075         error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
1076         if (error < 0)
1077                 goto error;
1078         if (server->nfs_client->rpc_ops->version == 3) {
1079                 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1080                         server->namelen = NFS3_MAXNAMLEN;
1081                 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
1082                         server->caps |= NFS_CAP_READDIRPLUS;
1083         } else {
1084                 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1085                         server->namelen = NFS2_MAXNAMLEN;
1086         }
1087 
1088         if (!(fattr->valid & NFS_ATTR_FATTR)) {
1089                 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
1090                 if (error < 0) {
1091                         dprintk("nfs_create_server: getattr error = %d\n", -error);
1092                         goto error;
1093                 }
1094         }
1095         memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1096 
1097         dprintk("Server FSID: %llx:%llx\n",
1098                 (unsigned long long) server->fsid.major,
1099                 (unsigned long long) server->fsid.minor);
1100 
1101         nfs_server_insert_lists(server);
1102         server->mount_time = jiffies;
1103         nfs_free_fattr(fattr);
1104         return server;
1105 
1106 error:
1107         nfs_free_fattr(fattr);
1108         nfs_free_server(server);
1109         return ERR_PTR(error);
1110 }
1111 EXPORT_SYMBOL_GPL(nfs_create_server);
1112 
1113 /*
1114  * Clone an NFS2, NFS3 or NFS4 server record
1115  */
1116 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1117                                     struct nfs_fh *fh,
1118                                     struct nfs_fattr *fattr,
1119                                     rpc_authflavor_t flavor)
1120 {
1121         struct nfs_server *server;
1122         struct nfs_fattr *fattr_fsinfo;
1123         int error;
1124 
1125         dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1126                 (unsigned long long) fattr->fsid.major,
1127                 (unsigned long long) fattr->fsid.minor);
1128 
1129         server = nfs_alloc_server();
1130         if (!server)
1131                 return ERR_PTR(-ENOMEM);
1132 
1133         error = -ENOMEM;
1134         fattr_fsinfo = nfs_alloc_fattr();
1135         if (fattr_fsinfo == NULL)
1136                 goto out_free_server;
1137 
1138         /* Copy data from the source */
1139         server->nfs_client = source->nfs_client;
1140         server->destroy = source->destroy;
1141         atomic_inc(&server->nfs_client->cl_count);
1142         nfs_server_copy_userdata(server, source);
1143 
1144         server->fsid = fattr->fsid;
1145 
1146         error = nfs_init_server_rpcclient(server,
1147                         source->client->cl_timeout,
1148                         flavor);
1149         if (error < 0)
1150                 goto out_free_server;
1151 
1152         /* probe the filesystem info for this server filesystem */
1153         error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1154         if (error < 0)
1155                 goto out_free_server;
1156 
1157         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1158                 server->namelen = NFS4_MAXNAMLEN;
1159 
1160         dprintk("Cloned FSID: %llx:%llx\n",
1161                 (unsigned long long) server->fsid.major,
1162                 (unsigned long long) server->fsid.minor);
1163 
1164         error = nfs_start_lockd(server);
1165         if (error < 0)
1166                 goto out_free_server;
1167 
1168         nfs_server_insert_lists(server);
1169         server->mount_time = jiffies;
1170 
1171         nfs_free_fattr(fattr_fsinfo);
1172         dprintk("<-- nfs_clone_server() = %p\n", server);
1173         return server;
1174 
1175 out_free_server:
1176         nfs_free_fattr(fattr_fsinfo);
1177         nfs_free_server(server);
1178         dprintk("<-- nfs_clone_server() = error %d\n", error);
1179         return ERR_PTR(error);
1180 }
1181 EXPORT_SYMBOL_GPL(nfs_clone_server);
1182 
1183 void nfs_clients_init(struct net *net)
1184 {
1185         struct nfs_net *nn = net_generic(net, nfs_net_id);
1186 
1187         INIT_LIST_HEAD(&nn->nfs_client_list);
1188         INIT_LIST_HEAD(&nn->nfs_volume_list);
1189 #if IS_ENABLED(CONFIG_NFS_V4)
1190         idr_init(&nn->cb_ident_idr);
1191 #endif
1192         spin_lock_init(&nn->nfs_client_lock);
1193         nn->boot_time = CURRENT_TIME;
1194 }
1195 
1196 #ifdef CONFIG_PROC_FS
1197 static struct proc_dir_entry *proc_fs_nfs;
1198 
1199 static int nfs_server_list_open(struct inode *inode, struct file *file);
1200 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1201 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1202 static void nfs_server_list_stop(struct seq_file *p, void *v);
1203 static int nfs_server_list_show(struct seq_file *m, void *v);
1204 
1205 static const struct seq_operations nfs_server_list_ops = {
1206         .start  = nfs_server_list_start,
1207         .next   = nfs_server_list_next,
1208         .stop   = nfs_server_list_stop,
1209         .show   = nfs_server_list_show,
1210 };
1211 
1212 static const struct file_operations nfs_server_list_fops = {
1213         .open           = nfs_server_list_open,
1214         .read           = seq_read,
1215         .llseek         = seq_lseek,
1216         .release        = seq_release_net,
1217         .owner          = THIS_MODULE,
1218 };
1219 
1220 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1221 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1222 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1223 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1224 static int nfs_volume_list_show(struct seq_file *m, void *v);
1225 
1226 static const struct seq_operations nfs_volume_list_ops = {
1227         .start  = nfs_volume_list_start,
1228         .next   = nfs_volume_list_next,
1229         .stop   = nfs_volume_list_stop,
1230         .show   = nfs_volume_list_show,
1231 };
1232 
1233 static const struct file_operations nfs_volume_list_fops = {
1234         .open           = nfs_volume_list_open,
1235         .read           = seq_read,
1236         .llseek         = seq_lseek,
1237         .release        = seq_release_net,
1238         .owner          = THIS_MODULE,
1239 };
1240 
1241 /*
1242  * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1243  * we're dealing
1244  */
1245 static int nfs_server_list_open(struct inode *inode, struct file *file)
1246 {
1247         return seq_open_net(inode, file, &nfs_server_list_ops,
1248                            sizeof(struct seq_net_private));
1249 }
1250 
1251 /*
1252  * set up the iterator to start reading from the server list and return the first item
1253  */
1254 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1255                                 __acquires(&nn->nfs_client_lock)
1256 {
1257         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1258 
1259         /* lock the list against modification */
1260         spin_lock(&nn->nfs_client_lock);
1261         return seq_list_start_head(&nn->nfs_client_list, *_pos);
1262 }
1263 
1264 /*
1265  * move to next server
1266  */
1267 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1268 {
1269         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1270 
1271         return seq_list_next(v, &nn->nfs_client_list, pos);
1272 }
1273 
1274 /*
1275  * clean up after reading from the transports list
1276  */
1277 static void nfs_server_list_stop(struct seq_file *p, void *v)
1278                                 __releases(&nn->nfs_client_lock)
1279 {
1280         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1281 
1282         spin_unlock(&nn->nfs_client_lock);
1283 }
1284 
1285 /*
1286  * display a header line followed by a load of call lines
1287  */
1288 static int nfs_server_list_show(struct seq_file *m, void *v)
1289 {
1290         struct nfs_client *clp;
1291         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1292 
1293         /* display header on line 1 */
1294         if (v == &nn->nfs_client_list) {
1295                 seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
1296                 return 0;
1297         }
1298 
1299         /* display one transport per line on subsequent lines */
1300         clp = list_entry(v, struct nfs_client, cl_share_link);
1301 
1302         /* Check if the client is initialized */
1303         if (clp->cl_cons_state != NFS_CS_READY)
1304                 return 0;
1305 
1306         rcu_read_lock();
1307         seq_printf(m, "v%u %s %s %3d %s\n",
1308                    clp->rpc_ops->version,
1309                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1310                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1311                    atomic_read(&clp->cl_count),
1312                    clp->cl_hostname);
1313         rcu_read_unlock();
1314 
1315         return 0;
1316 }
1317 
1318 /*
1319  * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1320  */
1321 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1322 {
1323         return seq_open_net(inode, file, &nfs_volume_list_ops,
1324                            sizeof(struct seq_net_private));
1325 }
1326 
1327 /*
1328  * set up the iterator to start reading from the volume list and return the first item
1329  */
1330 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1331                                 __acquires(&nn->nfs_client_lock)
1332 {
1333         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1334 
1335         /* lock the list against modification */
1336         spin_lock(&nn->nfs_client_lock);
1337         return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1338 }
1339 
1340 /*
1341  * move to next volume
1342  */
1343 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1344 {
1345         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1346 
1347         return seq_list_next(v, &nn->nfs_volume_list, pos);
1348 }
1349 
1350 /*
1351  * clean up after reading from the transports list
1352  */
1353 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1354                                 __releases(&nn->nfs_client_lock)
1355 {
1356         struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1357 
1358         spin_unlock(&nn->nfs_client_lock);
1359 }
1360 
1361 /*
1362  * display a header line followed by a load of call lines
1363  */
1364 static int nfs_volume_list_show(struct seq_file *m, void *v)
1365 {
1366         struct nfs_server *server;
1367         struct nfs_client *clp;
1368         char dev[8], fsid[17];
1369         struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1370 
1371         /* display header on line 1 */
1372         if (v == &nn->nfs_volume_list) {
1373                 seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
1374                 return 0;
1375         }
1376         /* display one transport per line on subsequent lines */
1377         server = list_entry(v, struct nfs_server, master_link);
1378         clp = server->nfs_client;
1379 
1380         snprintf(dev, 8, "%u:%u",
1381                  MAJOR(server->s_dev), MINOR(server->s_dev));
1382 
1383         snprintf(fsid, 17, "%llx:%llx",
1384                  (unsigned long long) server->fsid.major,
1385                  (unsigned long long) server->fsid.minor);
1386 
1387         rcu_read_lock();
1388         seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1389                    clp->rpc_ops->version,
1390                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1391                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1392                    dev,
1393                    fsid,
1394                    nfs_server_fscache_state(server));
1395         rcu_read_unlock();
1396 
1397         return 0;
1398 }
1399 
1400 int nfs_fs_proc_net_init(struct net *net)
1401 {
1402         struct nfs_net *nn = net_generic(net, nfs_net_id);
1403         struct proc_dir_entry *p;
1404 
1405         nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1406         if (!nn->proc_nfsfs)
1407                 goto error_0;
1408 
1409         /* a file of servers with which we're dealing */
1410         p = proc_create("servers", S_IFREG|S_IRUGO,
1411                         nn->proc_nfsfs, &nfs_server_list_fops);
1412         if (!p)
1413                 goto error_1;
1414 
1415         /* a file of volumes that we have mounted */
1416         p = proc_create("volumes", S_IFREG|S_IRUGO,
1417                         nn->proc_nfsfs, &nfs_volume_list_fops);
1418         if (!p)
1419                 goto error_1;
1420         return 0;
1421 
1422 error_1:
1423         remove_proc_subtree("nfsfs", net->proc_net);
1424 error_0:
1425         return -ENOMEM;
1426 }
1427 
1428 void nfs_fs_proc_net_exit(struct net *net)
1429 {
1430         remove_proc_subtree("nfsfs", net->proc_net);
1431 }
1432 
1433 /*
1434  * initialise the /proc/fs/nfsfs/ directory
1435  */
1436 int __init nfs_fs_proc_init(void)
1437 {
1438         struct proc_dir_entry *p;
1439 
1440         proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1441         if (!proc_fs_nfs)
1442                 goto error_0;
1443 
1444         /* a file of servers with which we're dealing */
1445         p = proc_symlink("servers", proc_fs_nfs, "../../net/nfsfs/servers");
1446         if (!p)
1447                 goto error_1;
1448 
1449         /* a file of volumes that we have mounted */
1450         p = proc_symlink("volumes", proc_fs_nfs, "../../net/nfsfs/volumes");
1451         if (!p)
1452                 goto error_2;
1453         return 0;
1454 
1455 error_2:
1456         remove_proc_entry("servers", proc_fs_nfs);
1457 error_1:
1458         remove_proc_entry("fs/nfsfs", NULL);
1459 error_0:
1460         return -ENOMEM;
1461 }
1462 
1463 /*
1464  * clean up the /proc/fs/nfsfs/ directory
1465  */
1466 void nfs_fs_proc_exit(void)
1467 {
1468         remove_proc_entry("volumes", proc_fs_nfs);
1469         remove_proc_entry("servers", proc_fs_nfs);
1470         remove_proc_entry("fs/nfsfs", NULL);
1471 }
1472 
1473 #endif /* CONFIG_PROC_FS */
1474 

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