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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))
114                 try_module_get(nfs->owner);
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         try_module_get(clp->cl_nfs_mod->owner);
162 
163         clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
164 
165         atomic_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         cred = rpc_lookup_machine_cred("*");
185         if (!IS_ERR(cred))
186                 clp->cl_machine_cred = cred;
187         nfs_fscache_get_client_cookie(clp);
188 
189         return clp;
190 
191 error_cleanup:
192         put_nfs_version(clp->cl_nfs_mod);
193         kfree(clp);
194 error_0:
195         return ERR_PTR(err);
196 }
197 EXPORT_SYMBOL_GPL(nfs_alloc_client);
198 
199 #if IS_ENABLED(CONFIG_NFS_V4)
200 void nfs_cleanup_cb_ident_idr(struct net *net)
201 {
202         struct nfs_net *nn = net_generic(net, nfs_net_id);
203 
204         idr_destroy(&nn->cb_ident_idr);
205 }
206 
207 /* nfs_client_lock held */
208 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
209 {
210         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
211 
212         if (clp->cl_cb_ident)
213                 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
214 }
215 
216 static void pnfs_init_server(struct nfs_server *server)
217 {
218         rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
219 }
220 
221 #else
222 void nfs_cleanup_cb_ident_idr(struct net *net)
223 {
224 }
225 
226 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
227 {
228 }
229 
230 static void pnfs_init_server(struct nfs_server *server)
231 {
232 }
233 
234 #endif /* CONFIG_NFS_V4 */
235 
236 /*
237  * Destroy a shared client record
238  */
239 void nfs_free_client(struct nfs_client *clp)
240 {
241         dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
242 
243         nfs_fscache_release_client_cookie(clp);
244 
245         /* -EIO all pending I/O */
246         if (!IS_ERR(clp->cl_rpcclient))
247                 rpc_shutdown_client(clp->cl_rpcclient);
248 
249         if (clp->cl_machine_cred != NULL)
250                 put_rpccred(clp->cl_machine_cred);
251 
252         put_net(clp->cl_net);
253         put_nfs_version(clp->cl_nfs_mod);
254         kfree(clp->cl_hostname);
255         kfree(clp);
256 
257         dprintk("<-- nfs_free_client()\n");
258 }
259 EXPORT_SYMBOL_GPL(nfs_free_client);
260 
261 /*
262  * Release a reference to a shared client record
263  */
264 void nfs_put_client(struct nfs_client *clp)
265 {
266         struct nfs_net *nn;
267 
268         if (!clp)
269                 return;
270 
271         dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
272         nn = net_generic(clp->cl_net, nfs_net_id);
273 
274         if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
275                 list_del(&clp->cl_share_link);
276                 nfs_cb_idr_remove_locked(clp);
277                 spin_unlock(&nn->nfs_client_lock);
278 
279                 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
280 
281                 clp->rpc_ops->free_client(clp);
282         }
283 }
284 EXPORT_SYMBOL_GPL(nfs_put_client);
285 
286 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
287 /*
288  * Test if two ip6 socket addresses refer to the same socket by
289  * comparing relevant fields. The padding bytes specifically, are not
290  * compared. sin6_flowinfo is not compared because it only affects QoS
291  * and sin6_scope_id is only compared if the address is "link local"
292  * because "link local" addresses need only be unique to a specific
293  * link. Conversely, ordinary unicast addresses might have different
294  * sin6_scope_id.
295  *
296  * The caller should ensure both socket addresses are AF_INET6.
297  */
298 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
299                                       const struct sockaddr *sa2)
300 {
301         const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
302         const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
303 
304         if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
305                 return 0;
306         else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
307                 return sin1->sin6_scope_id == sin2->sin6_scope_id;
308 
309         return 1;
310 }
311 #else   /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
312 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
313                                       const struct sockaddr *sa2)
314 {
315         return 0;
316 }
317 #endif
318 
319 /*
320  * Test if two ip4 socket addresses refer to the same socket, by
321  * comparing relevant fields. The padding bytes specifically, are
322  * not compared.
323  *
324  * The caller should ensure both socket addresses are AF_INET.
325  */
326 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
327                                       const struct sockaddr *sa2)
328 {
329         const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
330         const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
331 
332         return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
333 }
334 
335 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
336                                 const struct sockaddr *sa2)
337 {
338         const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
339         const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
340 
341         return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
342                 (sin1->sin6_port == sin2->sin6_port);
343 }
344 
345 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
346                                 const struct sockaddr *sa2)
347 {
348         const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
349         const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
350 
351         return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
352                 (sin1->sin_port == sin2->sin_port);
353 }
354 
355 #if defined(CONFIG_NFS_V4_1)
356 /*
357  * Test if two socket addresses represent the same actual socket,
358  * by comparing (only) relevant fields, excluding the port number.
359  */
360 int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
361                               const struct sockaddr *sa2)
362 {
363         if (sa1->sa_family != sa2->sa_family)
364                 return 0;
365 
366         switch (sa1->sa_family) {
367         case AF_INET:
368                 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
369         case AF_INET6:
370                 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
371         }
372         return 0;
373 }
374 EXPORT_SYMBOL_GPL(nfs_sockaddr_match_ipaddr);
375 #endif /* CONFIG_NFS_V4_1 */
376 
377 /*
378  * Test if two socket addresses represent the same actual socket,
379  * by comparing (only) relevant fields, including the port number.
380  */
381 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
382                             const struct sockaddr *sa2)
383 {
384         if (sa1->sa_family != sa2->sa_family)
385                 return 0;
386 
387         switch (sa1->sa_family) {
388         case AF_INET:
389                 return nfs_sockaddr_cmp_ip4(sa1, sa2);
390         case AF_INET6:
391                 return nfs_sockaddr_cmp_ip6(sa1, sa2);
392         }
393         return 0;
394 }
395 
396 /*
397  * Find an nfs_client on the list that matches the initialisation data
398  * that is supplied.
399  */
400 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
401 {
402         struct nfs_client *clp;
403         const struct sockaddr *sap = data->addr;
404         struct nfs_net *nn = net_generic(data->net, nfs_net_id);
405 
406         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
407                 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
408                 /* Don't match clients that failed to initialise properly */
409                 if (clp->cl_cons_state < 0)
410                         continue;
411 
412                 /* Different NFS versions cannot share the same nfs_client */
413                 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
414                         continue;
415 
416                 if (clp->cl_proto != data->proto)
417                         continue;
418                 /* Match nfsv4 minorversion */
419                 if (clp->cl_minorversion != data->minorversion)
420                         continue;
421                 /* Match the full socket address */
422                 if (!nfs_sockaddr_cmp(sap, clap))
423                         continue;
424 
425                 atomic_inc(&clp->cl_count);
426                 return clp;
427         }
428         return NULL;
429 }
430 
431 static bool nfs_client_init_is_complete(const struct nfs_client *clp)
432 {
433         return clp->cl_cons_state != NFS_CS_INITING;
434 }
435 
436 int nfs_wait_client_init_complete(const struct nfs_client *clp)
437 {
438         return wait_event_killable(nfs_client_active_wq,
439                         nfs_client_init_is_complete(clp));
440 }
441 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
442 
443 /*
444  * Found an existing client.  Make sure it's ready before returning.
445  */
446 static struct nfs_client *
447 nfs_found_client(const struct nfs_client_initdata *cl_init,
448                  struct nfs_client *clp)
449 {
450         int error;
451 
452         error = nfs_wait_client_init_complete(clp);
453         if (error < 0) {
454                 nfs_put_client(clp);
455                 return ERR_PTR(-ERESTARTSYS);
456         }
457 
458         if (clp->cl_cons_state < NFS_CS_READY) {
459                 error = clp->cl_cons_state;
460                 nfs_put_client(clp);
461                 return ERR_PTR(error);
462         }
463 
464         smp_rmb();
465 
466         dprintk("<-- %s found nfs_client %p for %s\n",
467                 __func__, clp, cl_init->hostname ?: "");
468         return clp;
469 }
470 
471 /*
472  * Look up a client by IP address and protocol version
473  * - creates a new record if one doesn't yet exist
474  */
475 struct nfs_client *
476 nfs_get_client(const struct nfs_client_initdata *cl_init,
477                const struct rpc_timeout *timeparms,
478                const char *ip_addr,
479                rpc_authflavor_t authflavour)
480 {
481         struct nfs_client *clp, *new = NULL;
482         struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
483         const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
484 
485         dprintk("--> nfs_get_client(%s,v%u)\n",
486                 cl_init->hostname ?: "", rpc_ops->version);
487 
488         /* see if the client already exists */
489         do {
490                 spin_lock(&nn->nfs_client_lock);
491 
492                 clp = nfs_match_client(cl_init);
493                 if (clp) {
494                         spin_unlock(&nn->nfs_client_lock);
495                         if (new)
496                                 new->rpc_ops->free_client(new);
497                         return nfs_found_client(cl_init, clp);
498                 }
499                 if (new) {
500                         list_add_tail(&new->cl_share_link,
501                                         &nn->nfs_client_list);
502                         spin_unlock(&nn->nfs_client_lock);
503                         new->cl_flags = cl_init->init_flags;
504                         return rpc_ops->init_client(new, timeparms, ip_addr);
505                 }
506 
507                 spin_unlock(&nn->nfs_client_lock);
508 
509                 new = rpc_ops->alloc_client(cl_init);
510         } while (!IS_ERR(new));
511 
512         dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
513                 cl_init->hostname ?: "", PTR_ERR(new));
514         return new;
515 }
516 EXPORT_SYMBOL_GPL(nfs_get_client);
517 
518 /*
519  * Mark a server as ready or failed
520  */
521 void nfs_mark_client_ready(struct nfs_client *clp, int state)
522 {
523         smp_wmb();
524         clp->cl_cons_state = state;
525         wake_up_all(&nfs_client_active_wq);
526 }
527 EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
528 
529 /*
530  * Initialise the timeout values for a connection
531  */
532 void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
533                                     unsigned int timeo, unsigned int retrans)
534 {
535         to->to_initval = timeo * HZ / 10;
536         to->to_retries = retrans;
537 
538         switch (proto) {
539         case XPRT_TRANSPORT_TCP:
540         case XPRT_TRANSPORT_RDMA:
541                 if (to->to_retries == 0)
542                         to->to_retries = NFS_DEF_TCP_RETRANS;
543                 if (to->to_initval == 0)
544                         to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
545                 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
546                         to->to_initval = NFS_MAX_TCP_TIMEOUT;
547                 to->to_increment = to->to_initval;
548                 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
549                 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
550                         to->to_maxval = NFS_MAX_TCP_TIMEOUT;
551                 if (to->to_maxval < to->to_initval)
552                         to->to_maxval = to->to_initval;
553                 to->to_exponential = 0;
554                 break;
555         case XPRT_TRANSPORT_UDP:
556                 if (to->to_retries == 0)
557                         to->to_retries = NFS_DEF_UDP_RETRANS;
558                 if (!to->to_initval)
559                         to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
560                 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
561                         to->to_initval = NFS_MAX_UDP_TIMEOUT;
562                 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
563                 to->to_exponential = 1;
564                 break;
565         default:
566                 BUG();
567         }
568 }
569 EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
570 
571 /*
572  * Create an RPC client handle
573  */
574 int nfs_create_rpc_client(struct nfs_client *clp,
575                           const struct rpc_timeout *timeparms,
576                           rpc_authflavor_t flavor)
577 {
578         struct rpc_clnt         *clnt = NULL;
579         struct rpc_create_args args = {
580                 .net            = clp->cl_net,
581                 .protocol       = clp->cl_proto,
582                 .address        = (struct sockaddr *)&clp->cl_addr,
583                 .addrsize       = clp->cl_addrlen,
584                 .timeout        = timeparms,
585                 .servername     = clp->cl_hostname,
586                 .program        = &nfs_program,
587                 .version        = clp->rpc_ops->version,
588                 .authflavor     = flavor,
589         };
590 
591         if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
592                 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
593         if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
594                 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
595         if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
596                 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
597 
598         if (!IS_ERR(clp->cl_rpcclient))
599                 return 0;
600 
601         clnt = rpc_create(&args);
602         if (IS_ERR(clnt)) {
603                 dprintk("%s: cannot create RPC client. Error = %ld\n",
604                                 __func__, PTR_ERR(clnt));
605                 return PTR_ERR(clnt);
606         }
607 
608         clp->cl_rpcclient = clnt;
609         return 0;
610 }
611 EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
612 
613 /*
614  * Version 2 or 3 client destruction
615  */
616 static void nfs_destroy_server(struct nfs_server *server)
617 {
618         if (server->nlm_host)
619                 nlmclnt_done(server->nlm_host);
620 }
621 
622 /*
623  * Version 2 or 3 lockd setup
624  */
625 static int nfs_start_lockd(struct nfs_server *server)
626 {
627         struct nlm_host *host;
628         struct nfs_client *clp = server->nfs_client;
629         struct nlmclnt_initdata nlm_init = {
630                 .hostname       = clp->cl_hostname,
631                 .address        = (struct sockaddr *)&clp->cl_addr,
632                 .addrlen        = clp->cl_addrlen,
633                 .nfs_version    = clp->rpc_ops->version,
634                 .noresvport     = server->flags & NFS_MOUNT_NORESVPORT ?
635                                         1 : 0,
636                 .net            = clp->cl_net,
637         };
638 
639         if (nlm_init.nfs_version > 3)
640                 return 0;
641         if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
642                         (server->flags & NFS_MOUNT_LOCAL_FCNTL))
643                 return 0;
644 
645         switch (clp->cl_proto) {
646                 default:
647                         nlm_init.protocol = IPPROTO_TCP;
648                         break;
649                 case XPRT_TRANSPORT_UDP:
650                         nlm_init.protocol = IPPROTO_UDP;
651         }
652 
653         host = nlmclnt_init(&nlm_init);
654         if (IS_ERR(host))
655                 return PTR_ERR(host);
656 
657         server->nlm_host = host;
658         server->destroy = nfs_destroy_server;
659         return 0;
660 }
661 
662 /*
663  * Create a general RPC client
664  */
665 int nfs_init_server_rpcclient(struct nfs_server *server,
666                 const struct rpc_timeout *timeo,
667                 rpc_authflavor_t pseudoflavour)
668 {
669         struct nfs_client *clp = server->nfs_client;
670 
671         server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
672                                                         pseudoflavour);
673         if (IS_ERR(server->client)) {
674                 dprintk("%s: couldn't create rpc_client!\n", __func__);
675                 return PTR_ERR(server->client);
676         }
677 
678         memcpy(&server->client->cl_timeout_default,
679                         timeo,
680                         sizeof(server->client->cl_timeout_default));
681         server->client->cl_timeout = &server->client->cl_timeout_default;
682         server->client->cl_softrtry = 0;
683         if (server->flags & NFS_MOUNT_SOFT)
684                 server->client->cl_softrtry = 1;
685 
686         return 0;
687 }
688 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
689 
690 /**
691  * nfs_init_client - Initialise an NFS2 or NFS3 client
692  *
693  * @clp: nfs_client to initialise
694  * @timeparms: timeout parameters for underlying RPC transport
695  * @ip_addr: IP presentation address (not used)
696  *
697  * Returns pointer to an NFS client, or an ERR_PTR value.
698  */
699 struct nfs_client *nfs_init_client(struct nfs_client *clp,
700                     const struct rpc_timeout *timeparms,
701                     const char *ip_addr)
702 {
703         int error;
704 
705         if (clp->cl_cons_state == NFS_CS_READY) {
706                 /* the client is already initialised */
707                 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
708                 return clp;
709         }
710 
711         /*
712          * Create a client RPC handle for doing FSSTAT with UNIX auth only
713          * - RFC 2623, sec 2.3.2
714          */
715         error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
716         if (error < 0)
717                 goto error;
718         nfs_mark_client_ready(clp, NFS_CS_READY);
719         return clp;
720 
721 error:
722         nfs_mark_client_ready(clp, error);
723         nfs_put_client(clp);
724         dprintk("<-- nfs_init_client() = xerror %d\n", error);
725         return ERR_PTR(error);
726 }
727 EXPORT_SYMBOL_GPL(nfs_init_client);
728 
729 /*
730  * Create a version 2 or 3 client
731  */
732 static int nfs_init_server(struct nfs_server *server,
733                            const struct nfs_parsed_mount_data *data,
734                            struct nfs_subversion *nfs_mod)
735 {
736         struct nfs_client_initdata cl_init = {
737                 .hostname = data->nfs_server.hostname,
738                 .addr = (const struct sockaddr *)&data->nfs_server.address,
739                 .addrlen = data->nfs_server.addrlen,
740                 .nfs_mod = nfs_mod,
741                 .proto = data->nfs_server.protocol,
742                 .net = data->net,
743         };
744         struct rpc_timeout timeparms;
745         struct nfs_client *clp;
746         int error;
747 
748         dprintk("--> nfs_init_server()\n");
749 
750         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
751                         data->timeo, data->retrans);
752         if (data->flags & NFS_MOUNT_NORESVPORT)
753                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
754 
755         /* Allocate or find a client reference we can use */
756         clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX);
757         if (IS_ERR(clp)) {
758                 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
759                 return PTR_ERR(clp);
760         }
761 
762         server->nfs_client = clp;
763 
764         /* Initialise the client representation from the mount data */
765         server->flags = data->flags;
766         server->options = data->options;
767         server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
768                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
769                 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR;
770 
771         if (data->rsize)
772                 server->rsize = nfs_block_size(data->rsize, NULL);
773         if (data->wsize)
774                 server->wsize = nfs_block_size(data->wsize, NULL);
775 
776         server->acregmin = data->acregmin * HZ;
777         server->acregmax = data->acregmax * HZ;
778         server->acdirmin = data->acdirmin * HZ;
779         server->acdirmax = data->acdirmax * HZ;
780 
781         /* Start lockd here, before we might error out */
782         error = nfs_start_lockd(server);
783         if (error < 0)
784                 goto error;
785 
786         server->port = data->nfs_server.port;
787 
788         error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
789         if (error < 0)
790                 goto error;
791 
792         /* Preserve the values of mount_server-related mount options */
793         if (data->mount_server.addrlen) {
794                 memcpy(&server->mountd_address, &data->mount_server.address,
795                         data->mount_server.addrlen);
796                 server->mountd_addrlen = data->mount_server.addrlen;
797         }
798         server->mountd_version = data->mount_server.version;
799         server->mountd_port = data->mount_server.port;
800         server->mountd_protocol = data->mount_server.protocol;
801 
802         server->namelen  = data->namlen;
803         dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
804         return 0;
805 
806 error:
807         server->nfs_client = NULL;
808         nfs_put_client(clp);
809         dprintk("<-- nfs_init_server() = xerror %d\n", error);
810         return error;
811 }
812 
813 /*
814  * Load up the server record from information gained in an fsinfo record
815  */
816 static void nfs_server_set_fsinfo(struct nfs_server *server,
817                                   struct nfs_fh *mntfh,
818                                   struct nfs_fsinfo *fsinfo)
819 {
820         unsigned long max_rpc_payload;
821 
822         /* Work out a lot of parameters */
823         if (server->rsize == 0)
824                 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
825         if (server->wsize == 0)
826                 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
827 
828         if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
829                 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
830         if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
831                 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
832 
833         max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
834         if (server->rsize > max_rpc_payload)
835                 server->rsize = max_rpc_payload;
836         if (server->rsize > NFS_MAX_FILE_IO_SIZE)
837                 server->rsize = NFS_MAX_FILE_IO_SIZE;
838         server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
839 
840         server->backing_dev_info.name = "nfs";
841         server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
842 
843         if (server->wsize > max_rpc_payload)
844                 server->wsize = max_rpc_payload;
845         if (server->wsize > NFS_MAX_FILE_IO_SIZE)
846                 server->wsize = NFS_MAX_FILE_IO_SIZE;
847         server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
848 
849         server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
850 
851         server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
852         if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
853                 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
854         if (server->dtsize > server->rsize)
855                 server->dtsize = server->rsize;
856 
857         if (server->flags & NFS_MOUNT_NOAC) {
858                 server->acregmin = server->acregmax = 0;
859                 server->acdirmin = server->acdirmax = 0;
860         }
861 
862         server->maxfilesize = fsinfo->maxfilesize;
863 
864         server->time_delta = fsinfo->time_delta;
865 
866         /* We're airborne Set socket buffersize */
867         rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
868 }
869 
870 /*
871  * Probe filesystem information, including the FSID on v2/v3
872  */
873 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
874 {
875         struct nfs_fsinfo fsinfo;
876         struct nfs_client *clp = server->nfs_client;
877         int error;
878 
879         dprintk("--> nfs_probe_fsinfo()\n");
880 
881         if (clp->rpc_ops->set_capabilities != NULL) {
882                 error = clp->rpc_ops->set_capabilities(server, mntfh);
883                 if (error < 0)
884                         goto out_error;
885         }
886 
887         fsinfo.fattr = fattr;
888         fsinfo.layouttype = 0;
889         error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
890         if (error < 0)
891                 goto out_error;
892 
893         nfs_server_set_fsinfo(server, mntfh, &fsinfo);
894 
895         /* Get some general file system info */
896         if (server->namelen == 0) {
897                 struct nfs_pathconf pathinfo;
898 
899                 pathinfo.fattr = fattr;
900                 nfs_fattr_init(fattr);
901 
902                 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
903                         server->namelen = pathinfo.max_namelen;
904         }
905 
906         dprintk("<-- nfs_probe_fsinfo() = 0\n");
907         return 0;
908 
909 out_error:
910         dprintk("nfs_probe_fsinfo: error = %d\n", -error);
911         return error;
912 }
913 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
914 
915 /*
916  * Copy useful information when duplicating a server record
917  */
918 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
919 {
920         target->flags = source->flags;
921         target->rsize = source->rsize;
922         target->wsize = source->wsize;
923         target->acregmin = source->acregmin;
924         target->acregmax = source->acregmax;
925         target->acdirmin = source->acdirmin;
926         target->acdirmax = source->acdirmax;
927         target->caps = source->caps;
928         target->options = source->options;
929 }
930 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
931 
932 void nfs_server_insert_lists(struct nfs_server *server)
933 {
934         struct nfs_client *clp = server->nfs_client;
935         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
936 
937         spin_lock(&nn->nfs_client_lock);
938         list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
939         list_add_tail(&server->master_link, &nn->nfs_volume_list);
940         clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
941         spin_unlock(&nn->nfs_client_lock);
942 
943 }
944 EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
945 
946 static void nfs_server_remove_lists(struct nfs_server *server)
947 {
948         struct nfs_client *clp = server->nfs_client;
949         struct nfs_net *nn;
950 
951         if (clp == NULL)
952                 return;
953         nn = net_generic(clp->cl_net, nfs_net_id);
954         spin_lock(&nn->nfs_client_lock);
955         list_del_rcu(&server->client_link);
956         if (list_empty(&clp->cl_superblocks))
957                 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
958         list_del(&server->master_link);
959         spin_unlock(&nn->nfs_client_lock);
960 
961         synchronize_rcu();
962 }
963 
964 /*
965  * Allocate and initialise a server record
966  */
967 struct nfs_server *nfs_alloc_server(void)
968 {
969         struct nfs_server *server;
970 
971         server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
972         if (!server)
973                 return NULL;
974 
975         server->client = server->client_acl = ERR_PTR(-EINVAL);
976 
977         /* Zero out the NFS state stuff */
978         INIT_LIST_HEAD(&server->client_link);
979         INIT_LIST_HEAD(&server->master_link);
980         INIT_LIST_HEAD(&server->delegations);
981         INIT_LIST_HEAD(&server->layouts);
982         INIT_LIST_HEAD(&server->state_owners_lru);
983 
984         atomic_set(&server->active, 0);
985 
986         server->io_stats = nfs_alloc_iostats();
987         if (!server->io_stats) {
988                 kfree(server);
989                 return NULL;
990         }
991 
992         if (bdi_init(&server->backing_dev_info)) {
993                 nfs_free_iostats(server->io_stats);
994                 kfree(server);
995                 return NULL;
996         }
997 
998         ida_init(&server->openowner_id);
999         ida_init(&server->lockowner_id);
1000         pnfs_init_server(server);
1001 
1002         return server;
1003 }
1004 EXPORT_SYMBOL_GPL(nfs_alloc_server);
1005 
1006 /*
1007  * Free up a server record
1008  */
1009 void nfs_free_server(struct nfs_server *server)
1010 {
1011         dprintk("--> nfs_free_server()\n");
1012 
1013         nfs_server_remove_lists(server);
1014 
1015         if (server->destroy != NULL)
1016                 server->destroy(server);
1017 
1018         if (!IS_ERR(server->client_acl))
1019                 rpc_shutdown_client(server->client_acl);
1020         if (!IS_ERR(server->client))
1021                 rpc_shutdown_client(server->client);
1022 
1023         nfs_put_client(server->nfs_client);
1024 
1025         ida_destroy(&server->lockowner_id);
1026         ida_destroy(&server->openowner_id);
1027         nfs_free_iostats(server->io_stats);
1028         bdi_destroy(&server->backing_dev_info);
1029         kfree(server);
1030         nfs_release_automount_timer();
1031         dprintk("<-- nfs_free_server()\n");
1032 }
1033 EXPORT_SYMBOL_GPL(nfs_free_server);
1034 
1035 /*
1036  * Create a version 2 or 3 volume record
1037  * - keyed on server and FSID
1038  */
1039 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
1040                                      struct nfs_subversion *nfs_mod)
1041 {
1042         struct nfs_server *server;
1043         struct nfs_fattr *fattr;
1044         int error;
1045 
1046         server = nfs_alloc_server();
1047         if (!server)
1048                 return ERR_PTR(-ENOMEM);
1049 
1050         error = -ENOMEM;
1051         fattr = nfs_alloc_fattr();
1052         if (fattr == NULL)
1053                 goto error;
1054 
1055         /* Get a client representation */
1056         error = nfs_init_server(server, mount_info->parsed, nfs_mod);
1057         if (error < 0)
1058                 goto error;
1059 
1060         /* Probe the root fh to retrieve its FSID */
1061         error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
1062         if (error < 0)
1063                 goto error;
1064         if (server->nfs_client->rpc_ops->version == 3) {
1065                 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1066                         server->namelen = NFS3_MAXNAMLEN;
1067                 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
1068                         server->caps |= NFS_CAP_READDIRPLUS;
1069         } else {
1070                 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1071                         server->namelen = NFS2_MAXNAMLEN;
1072         }
1073 
1074         if (!(fattr->valid & NFS_ATTR_FATTR)) {
1075                 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
1076                 if (error < 0) {
1077                         dprintk("nfs_create_server: getattr error = %d\n", -error);
1078                         goto error;
1079                 }
1080         }
1081         memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1082 
1083         dprintk("Server FSID: %llx:%llx\n",
1084                 (unsigned long long) server->fsid.major,
1085                 (unsigned long long) server->fsid.minor);
1086 
1087         nfs_server_insert_lists(server);
1088         server->mount_time = jiffies;
1089         nfs_free_fattr(fattr);
1090         return server;
1091 
1092 error:
1093         nfs_free_fattr(fattr);
1094         nfs_free_server(server);
1095         return ERR_PTR(error);
1096 }
1097 EXPORT_SYMBOL_GPL(nfs_create_server);
1098 
1099 /*
1100  * Clone an NFS2, NFS3 or NFS4 server record
1101  */
1102 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1103                                     struct nfs_fh *fh,
1104                                     struct nfs_fattr *fattr,
1105                                     rpc_authflavor_t flavor)
1106 {
1107         struct nfs_server *server;
1108         struct nfs_fattr *fattr_fsinfo;
1109         int error;
1110 
1111         dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1112                 (unsigned long long) fattr->fsid.major,
1113                 (unsigned long long) fattr->fsid.minor);
1114 
1115         server = nfs_alloc_server();
1116         if (!server)
1117                 return ERR_PTR(-ENOMEM);
1118 
1119         error = -ENOMEM;
1120         fattr_fsinfo = nfs_alloc_fattr();
1121         if (fattr_fsinfo == NULL)
1122                 goto out_free_server;
1123 
1124         /* Copy data from the source */
1125         server->nfs_client = source->nfs_client;
1126         server->destroy = source->destroy;
1127         atomic_inc(&server->nfs_client->cl_count);
1128         nfs_server_copy_userdata(server, source);
1129 
1130         server->fsid = fattr->fsid;
1131 
1132         error = nfs_init_server_rpcclient(server,
1133                         source->client->cl_timeout,
1134                         flavor);
1135         if (error < 0)
1136                 goto out_free_server;
1137 
1138         /* probe the filesystem info for this server filesystem */
1139         error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1140         if (error < 0)
1141                 goto out_free_server;
1142 
1143         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1144                 server->namelen = NFS4_MAXNAMLEN;
1145 
1146         dprintk("Cloned FSID: %llx:%llx\n",
1147                 (unsigned long long) server->fsid.major,
1148                 (unsigned long long) server->fsid.minor);
1149 
1150         error = nfs_start_lockd(server);
1151         if (error < 0)
1152                 goto out_free_server;
1153 
1154         nfs_server_insert_lists(server);
1155         server->mount_time = jiffies;
1156 
1157         nfs_free_fattr(fattr_fsinfo);
1158         dprintk("<-- nfs_clone_server() = %p\n", server);
1159         return server;
1160 
1161 out_free_server:
1162         nfs_free_fattr(fattr_fsinfo);
1163         nfs_free_server(server);
1164         dprintk("<-- nfs_clone_server() = error %d\n", error);
1165         return ERR_PTR(error);
1166 }
1167 EXPORT_SYMBOL_GPL(nfs_clone_server);
1168 
1169 void nfs_clients_init(struct net *net)
1170 {
1171         struct nfs_net *nn = net_generic(net, nfs_net_id);
1172 
1173         INIT_LIST_HEAD(&nn->nfs_client_list);
1174         INIT_LIST_HEAD(&nn->nfs_volume_list);
1175 #if IS_ENABLED(CONFIG_NFS_V4)
1176         idr_init(&nn->cb_ident_idr);
1177 #endif
1178         spin_lock_init(&nn->nfs_client_lock);
1179         nn->boot_time = CURRENT_TIME;
1180 }
1181 
1182 #ifdef CONFIG_PROC_FS
1183 static struct proc_dir_entry *proc_fs_nfs;
1184 
1185 static int nfs_server_list_open(struct inode *inode, struct file *file);
1186 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1187 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1188 static void nfs_server_list_stop(struct seq_file *p, void *v);
1189 static int nfs_server_list_show(struct seq_file *m, void *v);
1190 
1191 static const struct seq_operations nfs_server_list_ops = {
1192         .start  = nfs_server_list_start,
1193         .next   = nfs_server_list_next,
1194         .stop   = nfs_server_list_stop,
1195         .show   = nfs_server_list_show,
1196 };
1197 
1198 static const struct file_operations nfs_server_list_fops = {
1199         .open           = nfs_server_list_open,
1200         .read           = seq_read,
1201         .llseek         = seq_lseek,
1202         .release        = seq_release,
1203         .owner          = THIS_MODULE,
1204 };
1205 
1206 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1207 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1208 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1209 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1210 static int nfs_volume_list_show(struct seq_file *m, void *v);
1211 
1212 static const struct seq_operations nfs_volume_list_ops = {
1213         .start  = nfs_volume_list_start,
1214         .next   = nfs_volume_list_next,
1215         .stop   = nfs_volume_list_stop,
1216         .show   = nfs_volume_list_show,
1217 };
1218 
1219 static const struct file_operations nfs_volume_list_fops = {
1220         .open           = nfs_volume_list_open,
1221         .read           = seq_read,
1222         .llseek         = seq_lseek,
1223         .release        = seq_release,
1224         .owner          = THIS_MODULE,
1225 };
1226 
1227 /*
1228  * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1229  * we're dealing
1230  */
1231 static int nfs_server_list_open(struct inode *inode, struct file *file)
1232 {
1233         struct seq_file *m;
1234         int ret;
1235         struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1236         struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1237 
1238         ret = seq_open(file, &nfs_server_list_ops);
1239         if (ret < 0)
1240                 return ret;
1241 
1242         m = file->private_data;
1243         m->private = net;
1244 
1245         return 0;
1246 }
1247 
1248 /*
1249  * set up the iterator to start reading from the server list and return the first item
1250  */
1251 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1252 {
1253         struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1254 
1255         /* lock the list against modification */
1256         spin_lock(&nn->nfs_client_lock);
1257         return seq_list_start_head(&nn->nfs_client_list, *_pos);
1258 }
1259 
1260 /*
1261  * move to next server
1262  */
1263 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1264 {
1265         struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1266 
1267         return seq_list_next(v, &nn->nfs_client_list, pos);
1268 }
1269 
1270 /*
1271  * clean up after reading from the transports list
1272  */
1273 static void nfs_server_list_stop(struct seq_file *p, void *v)
1274 {
1275         struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1276 
1277         spin_unlock(&nn->nfs_client_lock);
1278 }
1279 
1280 /*
1281  * display a header line followed by a load of call lines
1282  */
1283 static int nfs_server_list_show(struct seq_file *m, void *v)
1284 {
1285         struct nfs_client *clp;
1286         struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1287 
1288         /* display header on line 1 */
1289         if (v == &nn->nfs_client_list) {
1290                 seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
1291                 return 0;
1292         }
1293 
1294         /* display one transport per line on subsequent lines */
1295         clp = list_entry(v, struct nfs_client, cl_share_link);
1296 
1297         /* Check if the client is initialized */
1298         if (clp->cl_cons_state != NFS_CS_READY)
1299                 return 0;
1300 
1301         rcu_read_lock();
1302         seq_printf(m, "v%u %s %s %3d %s\n",
1303                    clp->rpc_ops->version,
1304                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1305                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1306                    atomic_read(&clp->cl_count),
1307                    clp->cl_hostname);
1308         rcu_read_unlock();
1309 
1310         return 0;
1311 }
1312 
1313 /*
1314  * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1315  */
1316 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1317 {
1318         struct seq_file *m;
1319         int ret;
1320         struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1321         struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1322 
1323         ret = seq_open(file, &nfs_volume_list_ops);
1324         if (ret < 0)
1325                 return ret;
1326 
1327         m = file->private_data;
1328         m->private = net;
1329 
1330         return 0;
1331 }
1332 
1333 /*
1334  * set up the iterator to start reading from the volume list and return the first item
1335  */
1336 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1337 {
1338         struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1339 
1340         /* lock the list against modification */
1341         spin_lock(&nn->nfs_client_lock);
1342         return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1343 }
1344 
1345 /*
1346  * move to next volume
1347  */
1348 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1349 {
1350         struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1351 
1352         return seq_list_next(v, &nn->nfs_volume_list, pos);
1353 }
1354 
1355 /*
1356  * clean up after reading from the transports list
1357  */
1358 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1359 {
1360         struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1361 
1362         spin_unlock(&nn->nfs_client_lock);
1363 }
1364 
1365 /*
1366  * display a header line followed by a load of call lines
1367  */
1368 static int nfs_volume_list_show(struct seq_file *m, void *v)
1369 {
1370         struct nfs_server *server;
1371         struct nfs_client *clp;
1372         char dev[8], fsid[17];
1373         struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1374 
1375         /* display header on line 1 */
1376         if (v == &nn->nfs_volume_list) {
1377                 seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
1378                 return 0;
1379         }
1380         /* display one transport per line on subsequent lines */
1381         server = list_entry(v, struct nfs_server, master_link);
1382         clp = server->nfs_client;
1383 
1384         snprintf(dev, 8, "%u:%u",
1385                  MAJOR(server->s_dev), MINOR(server->s_dev));
1386 
1387         snprintf(fsid, 17, "%llx:%llx",
1388                  (unsigned long long) server->fsid.major,
1389                  (unsigned long long) server->fsid.minor);
1390 
1391         rcu_read_lock();
1392         seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1393                    clp->rpc_ops->version,
1394                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1395                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1396                    dev,
1397                    fsid,
1398                    nfs_server_fscache_state(server));
1399         rcu_read_unlock();
1400 
1401         return 0;
1402 }
1403 
1404 /*
1405  * initialise the /proc/fs/nfsfs/ directory
1406  */
1407 int __init nfs_fs_proc_init(void)
1408 {
1409         struct proc_dir_entry *p;
1410 
1411         proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1412         if (!proc_fs_nfs)
1413                 goto error_0;
1414 
1415         /* a file of servers with which we're dealing */
1416         p = proc_create("servers", S_IFREG|S_IRUGO,
1417                         proc_fs_nfs, &nfs_server_list_fops);
1418         if (!p)
1419                 goto error_1;
1420 
1421         /* a file of volumes that we have mounted */
1422         p = proc_create("volumes", S_IFREG|S_IRUGO,
1423                         proc_fs_nfs, &nfs_volume_list_fops);
1424         if (!p)
1425                 goto error_2;
1426         return 0;
1427 
1428 error_2:
1429         remove_proc_entry("servers", proc_fs_nfs);
1430 error_1:
1431         remove_proc_entry("fs/nfsfs", NULL);
1432 error_0:
1433         return -ENOMEM;
1434 }
1435 
1436 /*
1437  * clean up the /proc/fs/nfsfs/ directory
1438  */
1439 void nfs_fs_proc_exit(void)
1440 {
1441         remove_proc_entry("volumes", proc_fs_nfs);
1442         remove_proc_entry("servers", proc_fs_nfs);
1443         remove_proc_entry("fs/nfsfs", NULL);
1444 }
1445 
1446 #endif /* CONFIG_PROC_FS */
1447 

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