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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_NO_RETRANS_TIMEOUT, &clp->cl_flags))
594                 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
595         if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
596                 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
597         if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
598                 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
599 
600         if (!IS_ERR(clp->cl_rpcclient))
601                 return 0;
602 
603         clnt = rpc_create(&args);
604         if (IS_ERR(clnt)) {
605                 dprintk("%s: cannot create RPC client. Error = %ld\n",
606                                 __func__, PTR_ERR(clnt));
607                 return PTR_ERR(clnt);
608         }
609 
610         clp->cl_rpcclient = clnt;
611         return 0;
612 }
613 EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
614 
615 /*
616  * Version 2 or 3 client destruction
617  */
618 static void nfs_destroy_server(struct nfs_server *server)
619 {
620         if (server->nlm_host)
621                 nlmclnt_done(server->nlm_host);
622 }
623 
624 /*
625  * Version 2 or 3 lockd setup
626  */
627 static int nfs_start_lockd(struct nfs_server *server)
628 {
629         struct nlm_host *host;
630         struct nfs_client *clp = server->nfs_client;
631         struct nlmclnt_initdata nlm_init = {
632                 .hostname       = clp->cl_hostname,
633                 .address        = (struct sockaddr *)&clp->cl_addr,
634                 .addrlen        = clp->cl_addrlen,
635                 .nfs_version    = clp->rpc_ops->version,
636                 .noresvport     = server->flags & NFS_MOUNT_NORESVPORT ?
637                                         1 : 0,
638                 .net            = clp->cl_net,
639         };
640 
641         if (nlm_init.nfs_version > 3)
642                 return 0;
643         if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
644                         (server->flags & NFS_MOUNT_LOCAL_FCNTL))
645                 return 0;
646 
647         switch (clp->cl_proto) {
648                 default:
649                         nlm_init.protocol = IPPROTO_TCP;
650                         break;
651                 case XPRT_TRANSPORT_UDP:
652                         nlm_init.protocol = IPPROTO_UDP;
653         }
654 
655         host = nlmclnt_init(&nlm_init);
656         if (IS_ERR(host))
657                 return PTR_ERR(host);
658 
659         server->nlm_host = host;
660         server->destroy = nfs_destroy_server;
661         return 0;
662 }
663 
664 /*
665  * Create a general RPC client
666  */
667 int nfs_init_server_rpcclient(struct nfs_server *server,
668                 const struct rpc_timeout *timeo,
669                 rpc_authflavor_t pseudoflavour)
670 {
671         struct nfs_client *clp = server->nfs_client;
672 
673         server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
674                                                         pseudoflavour);
675         if (IS_ERR(server->client)) {
676                 dprintk("%s: couldn't create rpc_client!\n", __func__);
677                 return PTR_ERR(server->client);
678         }
679 
680         memcpy(&server->client->cl_timeout_default,
681                         timeo,
682                         sizeof(server->client->cl_timeout_default));
683         server->client->cl_timeout = &server->client->cl_timeout_default;
684         server->client->cl_softrtry = 0;
685         if (server->flags & NFS_MOUNT_SOFT)
686                 server->client->cl_softrtry = 1;
687 
688         return 0;
689 }
690 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
691 
692 /**
693  * nfs_init_client - Initialise an NFS2 or NFS3 client
694  *
695  * @clp: nfs_client to initialise
696  * @timeparms: timeout parameters for underlying RPC transport
697  * @ip_addr: IP presentation address (not used)
698  *
699  * Returns pointer to an NFS client, or an ERR_PTR value.
700  */
701 struct nfs_client *nfs_init_client(struct nfs_client *clp,
702                     const struct rpc_timeout *timeparms,
703                     const char *ip_addr)
704 {
705         int error;
706 
707         if (clp->cl_cons_state == NFS_CS_READY) {
708                 /* the client is already initialised */
709                 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
710                 return clp;
711         }
712 
713         /*
714          * Create a client RPC handle for doing FSSTAT with UNIX auth only
715          * - RFC 2623, sec 2.3.2
716          */
717         error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
718         if (error < 0)
719                 goto error;
720         nfs_mark_client_ready(clp, NFS_CS_READY);
721         return clp;
722 
723 error:
724         nfs_mark_client_ready(clp, error);
725         nfs_put_client(clp);
726         dprintk("<-- nfs_init_client() = xerror %d\n", error);
727         return ERR_PTR(error);
728 }
729 EXPORT_SYMBOL_GPL(nfs_init_client);
730 
731 /*
732  * Create a version 2 or 3 client
733  */
734 static int nfs_init_server(struct nfs_server *server,
735                            const struct nfs_parsed_mount_data *data,
736                            struct nfs_subversion *nfs_mod)
737 {
738         struct nfs_client_initdata cl_init = {
739                 .hostname = data->nfs_server.hostname,
740                 .addr = (const struct sockaddr *)&data->nfs_server.address,
741                 .addrlen = data->nfs_server.addrlen,
742                 .nfs_mod = nfs_mod,
743                 .proto = data->nfs_server.protocol,
744                 .net = data->net,
745         };
746         struct rpc_timeout timeparms;
747         struct nfs_client *clp;
748         int error;
749 
750         dprintk("--> nfs_init_server()\n");
751 
752         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
753                         data->timeo, data->retrans);
754         if (data->flags & NFS_MOUNT_NORESVPORT)
755                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
756 
757         /* Allocate or find a client reference we can use */
758         clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX);
759         if (IS_ERR(clp)) {
760                 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
761                 return PTR_ERR(clp);
762         }
763 
764         server->nfs_client = clp;
765 
766         /* Initialise the client representation from the mount data */
767         server->flags = data->flags;
768         server->options = data->options;
769         server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
770                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
771                 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR;
772 
773         if (data->rsize)
774                 server->rsize = nfs_block_size(data->rsize, NULL);
775         if (data->wsize)
776                 server->wsize = nfs_block_size(data->wsize, NULL);
777 
778         server->acregmin = data->acregmin * HZ;
779         server->acregmax = data->acregmax * HZ;
780         server->acdirmin = data->acdirmin * HZ;
781         server->acdirmax = data->acdirmax * HZ;
782 
783         /* Start lockd here, before we might error out */
784         error = nfs_start_lockd(server);
785         if (error < 0)
786                 goto error;
787 
788         server->port = data->nfs_server.port;
789         server->auth_info = data->auth_info;
790 
791         error = nfs_init_server_rpcclient(server, &timeparms,
792                                           data->selected_flavor);
793         if (error < 0)
794                 goto error;
795 
796         /* Preserve the values of mount_server-related mount options */
797         if (data->mount_server.addrlen) {
798                 memcpy(&server->mountd_address, &data->mount_server.address,
799                         data->mount_server.addrlen);
800                 server->mountd_addrlen = data->mount_server.addrlen;
801         }
802         server->mountd_version = data->mount_server.version;
803         server->mountd_port = data->mount_server.port;
804         server->mountd_protocol = data->mount_server.protocol;
805 
806         server->namelen  = data->namlen;
807         dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
808         return 0;
809 
810 error:
811         server->nfs_client = NULL;
812         nfs_put_client(clp);
813         dprintk("<-- nfs_init_server() = xerror %d\n", error);
814         return error;
815 }
816 
817 /*
818  * Load up the server record from information gained in an fsinfo record
819  */
820 static void nfs_server_set_fsinfo(struct nfs_server *server,
821                                   struct nfs_fh *mntfh,
822                                   struct nfs_fsinfo *fsinfo)
823 {
824         unsigned long max_rpc_payload;
825 
826         /* Work out a lot of parameters */
827         if (server->rsize == 0)
828                 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
829         if (server->wsize == 0)
830                 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
831 
832         if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
833                 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
834         if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
835                 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
836 
837         max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
838         if (server->rsize > max_rpc_payload)
839                 server->rsize = max_rpc_payload;
840         if (server->rsize > NFS_MAX_FILE_IO_SIZE)
841                 server->rsize = NFS_MAX_FILE_IO_SIZE;
842         server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
843 
844         server->backing_dev_info.name = "nfs";
845         server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
846 
847         if (server->wsize > max_rpc_payload)
848                 server->wsize = max_rpc_payload;
849         if (server->wsize > NFS_MAX_FILE_IO_SIZE)
850                 server->wsize = NFS_MAX_FILE_IO_SIZE;
851         server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
852 
853         server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
854 
855         server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
856         if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
857                 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
858         if (server->dtsize > server->rsize)
859                 server->dtsize = server->rsize;
860 
861         if (server->flags & NFS_MOUNT_NOAC) {
862                 server->acregmin = server->acregmax = 0;
863                 server->acdirmin = server->acdirmax = 0;
864         }
865 
866         server->maxfilesize = fsinfo->maxfilesize;
867 
868         server->time_delta = fsinfo->time_delta;
869 
870         /* We're airborne Set socket buffersize */
871         rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
872 }
873 
874 /*
875  * Probe filesystem information, including the FSID on v2/v3
876  */
877 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
878 {
879         struct nfs_fsinfo fsinfo;
880         struct nfs_client *clp = server->nfs_client;
881         int error;
882 
883         dprintk("--> nfs_probe_fsinfo()\n");
884 
885         if (clp->rpc_ops->set_capabilities != NULL) {
886                 error = clp->rpc_ops->set_capabilities(server, mntfh);
887                 if (error < 0)
888                         goto out_error;
889         }
890 
891         fsinfo.fattr = fattr;
892         fsinfo.layouttype = 0;
893         error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
894         if (error < 0)
895                 goto out_error;
896 
897         nfs_server_set_fsinfo(server, mntfh, &fsinfo);
898 
899         /* Get some general file system info */
900         if (server->namelen == 0) {
901                 struct nfs_pathconf pathinfo;
902 
903                 pathinfo.fattr = fattr;
904                 nfs_fattr_init(fattr);
905 
906                 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
907                         server->namelen = pathinfo.max_namelen;
908         }
909 
910         dprintk("<-- nfs_probe_fsinfo() = 0\n");
911         return 0;
912 
913 out_error:
914         dprintk("nfs_probe_fsinfo: error = %d\n", -error);
915         return error;
916 }
917 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
918 
919 /*
920  * Copy useful information when duplicating a server record
921  */
922 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
923 {
924         target->flags = source->flags;
925         target->rsize = source->rsize;
926         target->wsize = source->wsize;
927         target->acregmin = source->acregmin;
928         target->acregmax = source->acregmax;
929         target->acdirmin = source->acdirmin;
930         target->acdirmax = source->acdirmax;
931         target->caps = source->caps;
932         target->options = source->options;
933         target->auth_info = source->auth_info;
934 }
935 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
936 
937 void nfs_server_insert_lists(struct nfs_server *server)
938 {
939         struct nfs_client *clp = server->nfs_client;
940         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
941 
942         spin_lock(&nn->nfs_client_lock);
943         list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
944         list_add_tail(&server->master_link, &nn->nfs_volume_list);
945         clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
946         spin_unlock(&nn->nfs_client_lock);
947 
948 }
949 EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
950 
951 void nfs_server_remove_lists(struct nfs_server *server)
952 {
953         struct nfs_client *clp = server->nfs_client;
954         struct nfs_net *nn;
955 
956         if (clp == NULL)
957                 return;
958         nn = net_generic(clp->cl_net, nfs_net_id);
959         spin_lock(&nn->nfs_client_lock);
960         list_del_rcu(&server->client_link);
961         if (list_empty(&clp->cl_superblocks))
962                 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
963         list_del(&server->master_link);
964         spin_unlock(&nn->nfs_client_lock);
965 
966         synchronize_rcu();
967 }
968 EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
969 
970 /*
971  * Allocate and initialise a server record
972  */
973 struct nfs_server *nfs_alloc_server(void)
974 {
975         struct nfs_server *server;
976 
977         server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
978         if (!server)
979                 return NULL;
980 
981         server->client = server->client_acl = ERR_PTR(-EINVAL);
982 
983         /* Zero out the NFS state stuff */
984         INIT_LIST_HEAD(&server->client_link);
985         INIT_LIST_HEAD(&server->master_link);
986         INIT_LIST_HEAD(&server->delegations);
987         INIT_LIST_HEAD(&server->layouts);
988         INIT_LIST_HEAD(&server->state_owners_lru);
989 
990         atomic_set(&server->active, 0);
991 
992         server->io_stats = nfs_alloc_iostats();
993         if (!server->io_stats) {
994                 kfree(server);
995                 return NULL;
996         }
997 
998         if (bdi_init(&server->backing_dev_info)) {
999                 nfs_free_iostats(server->io_stats);
1000                 kfree(server);
1001                 return NULL;
1002         }
1003 
1004         ida_init(&server->openowner_id);
1005         ida_init(&server->lockowner_id);
1006         pnfs_init_server(server);
1007 
1008         return server;
1009 }
1010 EXPORT_SYMBOL_GPL(nfs_alloc_server);
1011 
1012 /*
1013  * Free up a server record
1014  */
1015 void nfs_free_server(struct nfs_server *server)
1016 {
1017         dprintk("--> nfs_free_server()\n");
1018 
1019         nfs_server_remove_lists(server);
1020 
1021         if (server->destroy != NULL)
1022                 server->destroy(server);
1023 
1024         if (!IS_ERR(server->client_acl))
1025                 rpc_shutdown_client(server->client_acl);
1026         if (!IS_ERR(server->client))
1027                 rpc_shutdown_client(server->client);
1028 
1029         nfs_put_client(server->nfs_client);
1030 
1031         ida_destroy(&server->lockowner_id);
1032         ida_destroy(&server->openowner_id);
1033         nfs_free_iostats(server->io_stats);
1034         bdi_destroy(&server->backing_dev_info);
1035         kfree(server);
1036         nfs_release_automount_timer();
1037         dprintk("<-- nfs_free_server()\n");
1038 }
1039 EXPORT_SYMBOL_GPL(nfs_free_server);
1040 
1041 /*
1042  * Create a version 2 or 3 volume record
1043  * - keyed on server and FSID
1044  */
1045 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
1046                                      struct nfs_subversion *nfs_mod)
1047 {
1048         struct nfs_server *server;
1049         struct nfs_fattr *fattr;
1050         int error;
1051 
1052         server = nfs_alloc_server();
1053         if (!server)
1054                 return ERR_PTR(-ENOMEM);
1055 
1056         error = -ENOMEM;
1057         fattr = nfs_alloc_fattr();
1058         if (fattr == NULL)
1059                 goto error;
1060 
1061         /* Get a client representation */
1062         error = nfs_init_server(server, mount_info->parsed, nfs_mod);
1063         if (error < 0)
1064                 goto error;
1065 
1066         /* Probe the root fh to retrieve its FSID */
1067         error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr);
1068         if (error < 0)
1069                 goto error;
1070         if (server->nfs_client->rpc_ops->version == 3) {
1071                 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1072                         server->namelen = NFS3_MAXNAMLEN;
1073                 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS))
1074                         server->caps |= NFS_CAP_READDIRPLUS;
1075         } else {
1076                 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1077                         server->namelen = NFS2_MAXNAMLEN;
1078         }
1079 
1080         if (!(fattr->valid & NFS_ATTR_FATTR)) {
1081                 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
1082                 if (error < 0) {
1083                         dprintk("nfs_create_server: getattr error = %d\n", -error);
1084                         goto error;
1085                 }
1086         }
1087         memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1088 
1089         dprintk("Server FSID: %llx:%llx\n",
1090                 (unsigned long long) server->fsid.major,
1091                 (unsigned long long) server->fsid.minor);
1092 
1093         nfs_server_insert_lists(server);
1094         server->mount_time = jiffies;
1095         nfs_free_fattr(fattr);
1096         return server;
1097 
1098 error:
1099         nfs_free_fattr(fattr);
1100         nfs_free_server(server);
1101         return ERR_PTR(error);
1102 }
1103 EXPORT_SYMBOL_GPL(nfs_create_server);
1104 
1105 /*
1106  * Clone an NFS2, NFS3 or NFS4 server record
1107  */
1108 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1109                                     struct nfs_fh *fh,
1110                                     struct nfs_fattr *fattr,
1111                                     rpc_authflavor_t flavor)
1112 {
1113         struct nfs_server *server;
1114         struct nfs_fattr *fattr_fsinfo;
1115         int error;
1116 
1117         dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1118                 (unsigned long long) fattr->fsid.major,
1119                 (unsigned long long) fattr->fsid.minor);
1120 
1121         server = nfs_alloc_server();
1122         if (!server)
1123                 return ERR_PTR(-ENOMEM);
1124 
1125         error = -ENOMEM;
1126         fattr_fsinfo = nfs_alloc_fattr();
1127         if (fattr_fsinfo == NULL)
1128                 goto out_free_server;
1129 
1130         /* Copy data from the source */
1131         server->nfs_client = source->nfs_client;
1132         server->destroy = source->destroy;
1133         atomic_inc(&server->nfs_client->cl_count);
1134         nfs_server_copy_userdata(server, source);
1135 
1136         server->fsid = fattr->fsid;
1137 
1138         error = nfs_init_server_rpcclient(server,
1139                         source->client->cl_timeout,
1140                         flavor);
1141         if (error < 0)
1142                 goto out_free_server;
1143 
1144         /* probe the filesystem info for this server filesystem */
1145         error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1146         if (error < 0)
1147                 goto out_free_server;
1148 
1149         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1150                 server->namelen = NFS4_MAXNAMLEN;
1151 
1152         dprintk("Cloned FSID: %llx:%llx\n",
1153                 (unsigned long long) server->fsid.major,
1154                 (unsigned long long) server->fsid.minor);
1155 
1156         error = nfs_start_lockd(server);
1157         if (error < 0)
1158                 goto out_free_server;
1159 
1160         nfs_server_insert_lists(server);
1161         server->mount_time = jiffies;
1162 
1163         nfs_free_fattr(fattr_fsinfo);
1164         dprintk("<-- nfs_clone_server() = %p\n", server);
1165         return server;
1166 
1167 out_free_server:
1168         nfs_free_fattr(fattr_fsinfo);
1169         nfs_free_server(server);
1170         dprintk("<-- nfs_clone_server() = error %d\n", error);
1171         return ERR_PTR(error);
1172 }
1173 EXPORT_SYMBOL_GPL(nfs_clone_server);
1174 
1175 void nfs_clients_init(struct net *net)
1176 {
1177         struct nfs_net *nn = net_generic(net, nfs_net_id);
1178 
1179         INIT_LIST_HEAD(&nn->nfs_client_list);
1180         INIT_LIST_HEAD(&nn->nfs_volume_list);
1181 #if IS_ENABLED(CONFIG_NFS_V4)
1182         idr_init(&nn->cb_ident_idr);
1183 #endif
1184         spin_lock_init(&nn->nfs_client_lock);
1185         nn->boot_time = CURRENT_TIME;
1186 }
1187 
1188 #ifdef CONFIG_PROC_FS
1189 static struct proc_dir_entry *proc_fs_nfs;
1190 
1191 static int nfs_server_list_open(struct inode *inode, struct file *file);
1192 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1193 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1194 static void nfs_server_list_stop(struct seq_file *p, void *v);
1195 static int nfs_server_list_show(struct seq_file *m, void *v);
1196 
1197 static const struct seq_operations nfs_server_list_ops = {
1198         .start  = nfs_server_list_start,
1199         .next   = nfs_server_list_next,
1200         .stop   = nfs_server_list_stop,
1201         .show   = nfs_server_list_show,
1202 };
1203 
1204 static const struct file_operations nfs_server_list_fops = {
1205         .open           = nfs_server_list_open,
1206         .read           = seq_read,
1207         .llseek         = seq_lseek,
1208         .release        = seq_release,
1209         .owner          = THIS_MODULE,
1210 };
1211 
1212 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1213 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1214 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1215 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1216 static int nfs_volume_list_show(struct seq_file *m, void *v);
1217 
1218 static const struct seq_operations nfs_volume_list_ops = {
1219         .start  = nfs_volume_list_start,
1220         .next   = nfs_volume_list_next,
1221         .stop   = nfs_volume_list_stop,
1222         .show   = nfs_volume_list_show,
1223 };
1224 
1225 static const struct file_operations nfs_volume_list_fops = {
1226         .open           = nfs_volume_list_open,
1227         .read           = seq_read,
1228         .llseek         = seq_lseek,
1229         .release        = seq_release,
1230         .owner          = THIS_MODULE,
1231 };
1232 
1233 /*
1234  * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1235  * we're dealing
1236  */
1237 static int nfs_server_list_open(struct inode *inode, struct file *file)
1238 {
1239         struct seq_file *m;
1240         int ret;
1241         struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1242         struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1243 
1244         ret = seq_open(file, &nfs_server_list_ops);
1245         if (ret < 0)
1246                 return ret;
1247 
1248         m = file->private_data;
1249         m->private = net;
1250 
1251         return 0;
1252 }
1253 
1254 /*
1255  * set up the iterator to start reading from the server list and return the first item
1256  */
1257 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1258 {
1259         struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1260 
1261         /* lock the list against modification */
1262         spin_lock(&nn->nfs_client_lock);
1263         return seq_list_start_head(&nn->nfs_client_list, *_pos);
1264 }
1265 
1266 /*
1267  * move to next server
1268  */
1269 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1270 {
1271         struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1272 
1273         return seq_list_next(v, &nn->nfs_client_list, pos);
1274 }
1275 
1276 /*
1277  * clean up after reading from the transports list
1278  */
1279 static void nfs_server_list_stop(struct seq_file *p, void *v)
1280 {
1281         struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1282 
1283         spin_unlock(&nn->nfs_client_lock);
1284 }
1285 
1286 /*
1287  * display a header line followed by a load of call lines
1288  */
1289 static int nfs_server_list_show(struct seq_file *m, void *v)
1290 {
1291         struct nfs_client *clp;
1292         struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1293 
1294         /* display header on line 1 */
1295         if (v == &nn->nfs_client_list) {
1296                 seq_puts(m, "NV SERVER   PORT USE HOSTNAME\n");
1297                 return 0;
1298         }
1299 
1300         /* display one transport per line on subsequent lines */
1301         clp = list_entry(v, struct nfs_client, cl_share_link);
1302 
1303         /* Check if the client is initialized */
1304         if (clp->cl_cons_state != NFS_CS_READY)
1305                 return 0;
1306 
1307         rcu_read_lock();
1308         seq_printf(m, "v%u %s %s %3d %s\n",
1309                    clp->rpc_ops->version,
1310                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1311                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1312                    atomic_read(&clp->cl_count),
1313                    clp->cl_hostname);
1314         rcu_read_unlock();
1315 
1316         return 0;
1317 }
1318 
1319 /*
1320  * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1321  */
1322 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1323 {
1324         struct seq_file *m;
1325         int ret;
1326         struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info;
1327         struct net *net = pid_ns->child_reaper->nsproxy->net_ns;
1328 
1329         ret = seq_open(file, &nfs_volume_list_ops);
1330         if (ret < 0)
1331                 return ret;
1332 
1333         m = file->private_data;
1334         m->private = net;
1335 
1336         return 0;
1337 }
1338 
1339 /*
1340  * set up the iterator to start reading from the volume list and return the first item
1341  */
1342 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1343 {
1344         struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1345 
1346         /* lock the list against modification */
1347         spin_lock(&nn->nfs_client_lock);
1348         return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1349 }
1350 
1351 /*
1352  * move to next volume
1353  */
1354 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1355 {
1356         struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1357 
1358         return seq_list_next(v, &nn->nfs_volume_list, pos);
1359 }
1360 
1361 /*
1362  * clean up after reading from the transports list
1363  */
1364 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1365 {
1366         struct nfs_net *nn = net_generic(p->private, nfs_net_id);
1367 
1368         spin_unlock(&nn->nfs_client_lock);
1369 }
1370 
1371 /*
1372  * display a header line followed by a load of call lines
1373  */
1374 static int nfs_volume_list_show(struct seq_file *m, void *v)
1375 {
1376         struct nfs_server *server;
1377         struct nfs_client *clp;
1378         char dev[8], fsid[17];
1379         struct nfs_net *nn = net_generic(m->private, nfs_net_id);
1380 
1381         /* display header on line 1 */
1382         if (v == &nn->nfs_volume_list) {
1383                 seq_puts(m, "NV SERVER   PORT DEV     FSID              FSC\n");
1384                 return 0;
1385         }
1386         /* display one transport per line on subsequent lines */
1387         server = list_entry(v, struct nfs_server, master_link);
1388         clp = server->nfs_client;
1389 
1390         snprintf(dev, 8, "%u:%u",
1391                  MAJOR(server->s_dev), MINOR(server->s_dev));
1392 
1393         snprintf(fsid, 17, "%llx:%llx",
1394                  (unsigned long long) server->fsid.major,
1395                  (unsigned long long) server->fsid.minor);
1396 
1397         rcu_read_lock();
1398         seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1399                    clp->rpc_ops->version,
1400                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1401                    rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1402                    dev,
1403                    fsid,
1404                    nfs_server_fscache_state(server));
1405         rcu_read_unlock();
1406 
1407         return 0;
1408 }
1409 
1410 /*
1411  * initialise the /proc/fs/nfsfs/ directory
1412  */
1413 int __init nfs_fs_proc_init(void)
1414 {
1415         struct proc_dir_entry *p;
1416 
1417         proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1418         if (!proc_fs_nfs)
1419                 goto error_0;
1420 
1421         /* a file of servers with which we're dealing */
1422         p = proc_create("servers", S_IFREG|S_IRUGO,
1423                         proc_fs_nfs, &nfs_server_list_fops);
1424         if (!p)
1425                 goto error_1;
1426 
1427         /* a file of volumes that we have mounted */
1428         p = proc_create("volumes", S_IFREG|S_IRUGO,
1429                         proc_fs_nfs, &nfs_volume_list_fops);
1430         if (!p)
1431                 goto error_2;
1432         return 0;
1433 
1434 error_2:
1435         remove_proc_entry("servers", proc_fs_nfs);
1436 error_1:
1437         remove_proc_entry("fs/nfsfs", NULL);
1438 error_0:
1439         return -ENOMEM;
1440 }
1441 
1442 /*
1443  * clean up the /proc/fs/nfsfs/ directory
1444  */
1445 void nfs_fs_proc_exit(void)
1446 {
1447         remove_proc_entry("volumes", proc_fs_nfs);
1448         remove_proc_entry("servers", proc_fs_nfs);
1449         remove_proc_entry("fs/nfsfs", NULL);
1450 }
1451 
1452 #endif /* CONFIG_PROC_FS */
1453 

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