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smp_call_function_single(): be slightly less stupid, fix #2
[linux-2.6/mini2440.git] / fs / nfs / client.c
blob9b728f3565a13d154c4c47ca8fed9ea1d32a4d9b
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 <net/ipv6.h>
39 #include <linux/nfs_xdr.h>
40
41 #include <asm/system.h>
42
43 #include "nfs4_fs.h"
44 #include "callback.h"
45 #include "delegation.h"
46 #include "iostat.h"
47 #include "internal.h"
48
49 #define NFSDBG_FACILITY NFSDBG_CLIENT
50
51 static DEFINE_SPINLOCK(nfs_client_lock);
52 static LIST_HEAD(nfs_client_list);
53 static LIST_HEAD(nfs_volume_list);
54 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
55
56 /*
57 * RPC cruft for NFS
58 */
59 static struct rpc_version *nfs_version[5] = {
60 [2] = &nfs_version2,
61 #ifdef CONFIG_NFS_V3
62 [3] = &nfs_version3,
63 #endif
64 #ifdef CONFIG_NFS_V4
65 [4] = &nfs_version4,
66 #endif
67 };
68
69 struct rpc_program nfs_program = {
70 .name = "nfs",
71 .number = NFS_PROGRAM,
72 .nrvers = ARRAY_SIZE(nfs_version),
73 .version = nfs_version,
74 .stats = &nfs_rpcstat,
75 .pipe_dir_name = "/nfs",
76 };
77
78 struct rpc_stat nfs_rpcstat = {
79 .program = &nfs_program
80 };
81
82
83 #ifdef CONFIG_NFS_V3_ACL
84 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
85 static struct rpc_version * nfsacl_version[] = {
86 [3] = &nfsacl_version3,
87 };
88
89 struct rpc_program nfsacl_program = {
90 .name = "nfsacl",
91 .number = NFS_ACL_PROGRAM,
92 .nrvers = ARRAY_SIZE(nfsacl_version),
93 .version = nfsacl_version,
94 .stats = &nfsacl_rpcstat,
95 };
96 #endif /* CONFIG_NFS_V3_ACL */
97
98 struct nfs_client_initdata {
99 const char *hostname;
100 const struct sockaddr *addr;
101 size_t addrlen;
102 const struct nfs_rpc_ops *rpc_ops;
103 int proto;
104 };
105
106 /*
107 * Allocate a shared client record
108 *
109 * Since these are allocated/deallocated very rarely, we don't
110 * bother putting them in a slab cache...
111 */
112 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
113 {
114 struct nfs_client *clp;
115 struct rpc_cred *cred;
116
117 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
118 goto error_0;
119
120 clp->rpc_ops = cl_init->rpc_ops;
121
122 if (cl_init->rpc_ops->version == 4) {
123 if (nfs_callback_up() < 0)
124 goto error_2;
125 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
126 }
127
128 atomic_set(&clp->cl_count, 1);
129 clp->cl_cons_state = NFS_CS_INITING;
130
131 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
132 clp->cl_addrlen = cl_init->addrlen;
133
134 if (cl_init->hostname) {
135 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
136 if (!clp->cl_hostname)
137 goto error_3;
138 }
139
140 INIT_LIST_HEAD(&clp->cl_superblocks);
141 clp->cl_rpcclient = ERR_PTR(-EINVAL);
142
143 clp->cl_proto = cl_init->proto;
144
145 #ifdef CONFIG_NFS_V4
146 INIT_LIST_HEAD(&clp->cl_delegations);
147 spin_lock_init(&clp->cl_lock);
148 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
149 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
150 clp->cl_boot_time = CURRENT_TIME;
151 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
152 #endif
153 cred = rpc_lookup_machine_cred();
154 if (!IS_ERR(cred))
155 clp->cl_machine_cred = cred;
156
157 return clp;
158
159 error_3:
160 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
161 nfs_callback_down();
162 error_2:
163 kfree(clp);
164 error_0:
165 return NULL;
166 }
167
168 static void nfs4_shutdown_client(struct nfs_client *clp)
169 {
170 #ifdef CONFIG_NFS_V4
171 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
172 nfs4_kill_renewd(clp);
173 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
174 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
175 nfs_idmap_delete(clp);
176
177 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
178 #endif
179 }
180
181 /*
182 * Destroy a shared client record
183 */
184 static void nfs_free_client(struct nfs_client *clp)
185 {
186 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
187
188 nfs4_shutdown_client(clp);
189
190 /* -EIO all pending I/O */
191 if (!IS_ERR(clp->cl_rpcclient))
192 rpc_shutdown_client(clp->cl_rpcclient);
193
194 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
195 nfs_callback_down();
196
197 if (clp->cl_machine_cred != NULL)
198 put_rpccred(clp->cl_machine_cred);
199
200 kfree(clp->cl_hostname);
201 kfree(clp);
202
203 dprintk("<-- nfs_free_client()\n");
204 }
205
206 /*
207 * Release a reference to a shared client record
208 */
209 void nfs_put_client(struct nfs_client *clp)
210 {
211 if (!clp)
212 return;
213
214 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
215
216 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
217 list_del(&clp->cl_share_link);
218 spin_unlock(&nfs_client_lock);
219
220 BUG_ON(!list_empty(&clp->cl_superblocks));
221
222 nfs_free_client(clp);
223 }
224 }
225
226 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
227 static const struct in6_addr *nfs_map_ipv4_addr(const struct sockaddr *sa, struct in6_addr *addr_mapped)
228 {
229 switch (sa->sa_family) {
230 default:
231 return NULL;
232 case AF_INET6:
233 return &((const struct sockaddr_in6 *)sa)->sin6_addr;
234 break;
235 case AF_INET:
236 ipv6_addr_set_v4mapped(((const struct sockaddr_in *)sa)->sin_addr.s_addr,
237 addr_mapped);
238 return addr_mapped;
239 }
240 }
241
242 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
243 const struct sockaddr *sa2)
244 {
245 const struct in6_addr *addr1;
246 const struct in6_addr *addr2;
247 struct in6_addr addr1_mapped;
248 struct in6_addr addr2_mapped;
249
250 addr1 = nfs_map_ipv4_addr(sa1, &addr1_mapped);
251 if (likely(addr1 != NULL)) {
252 addr2 = nfs_map_ipv4_addr(sa2, &addr2_mapped);
253 if (likely(addr2 != NULL))
254 return ipv6_addr_equal(addr1, addr2);
255 }
256 return 0;
257 }
258 #else
259 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
260 const struct sockaddr_in *sa2)
261 {
262 return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
263 }
264
265 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
266 const struct sockaddr *sa2)
267 {
268 if (unlikely(sa1->sa_family != AF_INET || sa2->sa_family != AF_INET))
269 return 0;
270 return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
271 (const struct sockaddr_in *)sa2);
272 }
273 #endif
274
275 /*
276 * Find a client by IP address and protocol version
277 * - returns NULL if no such client
278 */
279 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
280 {
281 struct nfs_client *clp;
282
283 spin_lock(&nfs_client_lock);
284 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
285 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
286
287 /* Don't match clients that failed to initialise properly */
288 if (clp->cl_cons_state != NFS_CS_READY)
289 continue;
290
291 /* Different NFS versions cannot share the same nfs_client */
292 if (clp->rpc_ops->version != nfsversion)
293 continue;
294
295 /* Match only the IP address, not the port number */
296 if (!nfs_sockaddr_match_ipaddr(addr, clap))
297 continue;
298
299 atomic_inc(&clp->cl_count);
300 spin_unlock(&nfs_client_lock);
301 return clp;
302 }
303 spin_unlock(&nfs_client_lock);
304 return NULL;
305 }
306
307 /*
308 * Find a client by IP address and protocol version
309 * - returns NULL if no such client
310 */
311 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
312 {
313 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
314 u32 nfsvers = clp->rpc_ops->version;
315
316 spin_lock(&nfs_client_lock);
317 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
318 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
319
320 /* Don't match clients that failed to initialise properly */
321 if (clp->cl_cons_state != NFS_CS_READY)
322 continue;
323
324 /* Different NFS versions cannot share the same nfs_client */
325 if (clp->rpc_ops->version != nfsvers)
326 continue;
327
328 /* Match only the IP address, not the port number */
329 if (!nfs_sockaddr_match_ipaddr(sap, clap))
330 continue;
331
332 atomic_inc(&clp->cl_count);
333 spin_unlock(&nfs_client_lock);
334 return clp;
335 }
336 spin_unlock(&nfs_client_lock);
337 return NULL;
338 }
339
340 /*
341 * Find an nfs_client on the list that matches the initialisation data
342 * that is supplied.
343 */
344 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
345 {
346 struct nfs_client *clp;
347
348 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
349 /* Don't match clients that failed to initialise properly */
350 if (clp->cl_cons_state < 0)
351 continue;
352
353 /* Different NFS versions cannot share the same nfs_client */
354 if (clp->rpc_ops != data->rpc_ops)
355 continue;
356
357 if (clp->cl_proto != data->proto)
358 continue;
359
360 /* Match the full socket address */
361 if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
362 continue;
363
364 atomic_inc(&clp->cl_count);
365 return clp;
366 }
367 return NULL;
368 }
369
370 /*
371 * Look up a client by IP address and protocol version
372 * - creates a new record if one doesn't yet exist
373 */
374 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
375 {
376 struct nfs_client *clp, *new = NULL;
377 int error;
378
379 dprintk("--> nfs_get_client(%s,v%u)\n",
380 cl_init->hostname ?: "", cl_init->rpc_ops->version);
381
382 /* see if the client already exists */
383 do {
384 spin_lock(&nfs_client_lock);
385
386 clp = nfs_match_client(cl_init);
387 if (clp)
388 goto found_client;
389 if (new)
390 goto install_client;
391
392 spin_unlock(&nfs_client_lock);
393
394 new = nfs_alloc_client(cl_init);
395 } while (new);
396
397 return ERR_PTR(-ENOMEM);
398
399 /* install a new client and return with it unready */
400 install_client:
401 clp = new;
402 list_add(&clp->cl_share_link, &nfs_client_list);
403 spin_unlock(&nfs_client_lock);
404 dprintk("--> nfs_get_client() = %p [new]\n", clp);
405 return clp;
406
407 /* found an existing client
408 * - make sure it's ready before returning
409 */
410 found_client:
411 spin_unlock(&nfs_client_lock);
412
413 if (new)
414 nfs_free_client(new);
415
416 error = wait_event_killable(nfs_client_active_wq,
417 clp->cl_cons_state != NFS_CS_INITING);
418 if (error < 0) {
419 nfs_put_client(clp);
420 return ERR_PTR(-ERESTARTSYS);
421 }
422
423 if (clp->cl_cons_state < NFS_CS_READY) {
424 error = clp->cl_cons_state;
425 nfs_put_client(clp);
426 return ERR_PTR(error);
427 }
428
429 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
430
431 dprintk("--> nfs_get_client() = %p [share]\n", clp);
432 return clp;
433 }
434
435 /*
436 * Mark a server as ready or failed
437 */
438 static void nfs_mark_client_ready(struct nfs_client *clp, int state)
439 {
440 clp->cl_cons_state = state;
441 wake_up_all(&nfs_client_active_wq);
442 }
443
444 /*
445 * Initialise the timeout values for a connection
446 */
447 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
448 unsigned int timeo, unsigned int retrans)
449 {
450 to->to_initval = timeo * HZ / 10;
451 to->to_retries = retrans;
452
453 switch (proto) {
454 case XPRT_TRANSPORT_TCP:
455 case XPRT_TRANSPORT_RDMA:
456 if (to->to_retries == 0)
457 to->to_retries = NFS_DEF_TCP_RETRANS;
458 if (to->to_initval == 0)
459 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
460 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
461 to->to_initval = NFS_MAX_TCP_TIMEOUT;
462 to->to_increment = to->to_initval;
463 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
464 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
465 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
466 if (to->to_maxval < to->to_initval)
467 to->to_maxval = to->to_initval;
468 to->to_exponential = 0;
469 break;
470 case XPRT_TRANSPORT_UDP:
471 if (to->to_retries == 0)
472 to->to_retries = NFS_DEF_UDP_RETRANS;
473 if (!to->to_initval)
474 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
475 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
476 to->to_initval = NFS_MAX_UDP_TIMEOUT;
477 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
478 to->to_exponential = 1;
479 break;
480 default:
481 BUG();
482 }
483 }
484
485 /*
486 * Create an RPC client handle
487 */
488 static int nfs_create_rpc_client(struct nfs_client *clp,
489 const struct rpc_timeout *timeparms,
490 rpc_authflavor_t flavor,
491 int discrtry, int noresvport)
492 {
493 struct rpc_clnt *clnt = NULL;
494 struct rpc_create_args args = {
495 .protocol = clp->cl_proto,
496 .address = (struct sockaddr *)&clp->cl_addr,
497 .addrsize = clp->cl_addrlen,
498 .timeout = timeparms,
499 .servername = clp->cl_hostname,
500 .program = &nfs_program,
501 .version = clp->rpc_ops->version,
502 .authflavor = flavor,
503 };
504
505 if (discrtry)
506 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
507 if (noresvport)
508 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
509
510 if (!IS_ERR(clp->cl_rpcclient))
511 return 0;
512
513 clnt = rpc_create(&args);
514 if (IS_ERR(clnt)) {
515 dprintk("%s: cannot create RPC client. Error = %ld\n",
516 __func__, PTR_ERR(clnt));
517 return PTR_ERR(clnt);
518 }
519
520 clp->cl_rpcclient = clnt;
521 return 0;
522 }
523
524 /*
525 * Version 2 or 3 client destruction
526 */
527 static void nfs_destroy_server(struct nfs_server *server)
528 {
529 if (!(server->flags & NFS_MOUNT_NONLM))
530 nlmclnt_done(server->nlm_host);
531 }
532
533 /*
534 * Version 2 or 3 lockd setup
535 */
536 static int nfs_start_lockd(struct nfs_server *server)
537 {
538 struct nlm_host *host;
539 struct nfs_client *clp = server->nfs_client;
540 struct nlmclnt_initdata nlm_init = {
541 .hostname = clp->cl_hostname,
542 .address = (struct sockaddr *)&clp->cl_addr,
543 .addrlen = clp->cl_addrlen,
544 .protocol = server->flags & NFS_MOUNT_TCP ?
545 IPPROTO_TCP : IPPROTO_UDP,
546 .nfs_version = clp->rpc_ops->version,
547 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
548 1 : 0,
549 };
550
551 if (nlm_init.nfs_version > 3)
552 return 0;
553 if (server->flags & NFS_MOUNT_NONLM)
554 return 0;
555
556 host = nlmclnt_init(&nlm_init);
557 if (IS_ERR(host))
558 return PTR_ERR(host);
559
560 server->nlm_host = host;
561 server->destroy = nfs_destroy_server;
562 return 0;
563 }
564
565 /*
566 * Initialise an NFSv3 ACL client connection
567 */
568 #ifdef CONFIG_NFS_V3_ACL
569 static void nfs_init_server_aclclient(struct nfs_server *server)
570 {
571 if (server->nfs_client->rpc_ops->version != 3)
572 goto out_noacl;
573 if (server->flags & NFS_MOUNT_NOACL)
574 goto out_noacl;
575
576 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
577 if (IS_ERR(server->client_acl))
578 goto out_noacl;
579
580 /* No errors! Assume that Sun nfsacls are supported */
581 server->caps |= NFS_CAP_ACLS;
582 return;
583
584 out_noacl:
585 server->caps &= ~NFS_CAP_ACLS;
586 }
587 #else
588 static inline void nfs_init_server_aclclient(struct nfs_server *server)
589 {
590 server->flags &= ~NFS_MOUNT_NOACL;
591 server->caps &= ~NFS_CAP_ACLS;
592 }
593 #endif
594
595 /*
596 * Create a general RPC client
597 */
598 static int nfs_init_server_rpcclient(struct nfs_server *server,
599 const struct rpc_timeout *timeo,
600 rpc_authflavor_t pseudoflavour)
601 {
602 struct nfs_client *clp = server->nfs_client;
603
604 server->client = rpc_clone_client(clp->cl_rpcclient);
605 if (IS_ERR(server->client)) {
606 dprintk("%s: couldn't create rpc_client!\n", __func__);
607 return PTR_ERR(server->client);
608 }
609
610 memcpy(&server->client->cl_timeout_default,
611 timeo,
612 sizeof(server->client->cl_timeout_default));
613 server->client->cl_timeout = &server->client->cl_timeout_default;
614
615 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
616 struct rpc_auth *auth;
617
618 auth = rpcauth_create(pseudoflavour, server->client);
619 if (IS_ERR(auth)) {
620 dprintk("%s: couldn't create credcache!\n", __func__);
621 return PTR_ERR(auth);
622 }
623 }
624 server->client->cl_softrtry = 0;
625 if (server->flags & NFS_MOUNT_SOFT)
626 server->client->cl_softrtry = 1;
627
628 return 0;
629 }
630
631 /*
632 * Initialise an NFS2 or NFS3 client
633 */
634 static int nfs_init_client(struct nfs_client *clp,
635 const struct rpc_timeout *timeparms,
636 const struct nfs_parsed_mount_data *data)
637 {
638 int error;
639
640 if (clp->cl_cons_state == NFS_CS_READY) {
641 /* the client is already initialised */
642 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
643 return 0;
644 }
645
646 /*
647 * Create a client RPC handle for doing FSSTAT with UNIX auth only
648 * - RFC 2623, sec 2.3.2
649 */
650 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
651 0, data->flags & NFS_MOUNT_NORESVPORT);
652 if (error < 0)
653 goto error;
654 nfs_mark_client_ready(clp, NFS_CS_READY);
655 return 0;
656
657 error:
658 nfs_mark_client_ready(clp, error);
659 dprintk("<-- nfs_init_client() = xerror %d\n", error);
660 return error;
661 }
662
663 /*
664 * Create a version 2 or 3 client
665 */
666 static int nfs_init_server(struct nfs_server *server,
667 const struct nfs_parsed_mount_data *data)
668 {
669 struct nfs_client_initdata cl_init = {
670 .hostname = data->nfs_server.hostname,
671 .addr = (const struct sockaddr *)&data->nfs_server.address,
672 .addrlen = data->nfs_server.addrlen,
673 .rpc_ops = &nfs_v2_clientops,
674 .proto = data->nfs_server.protocol,
675 };
676 struct rpc_timeout timeparms;
677 struct nfs_client *clp;
678 int error;
679
680 dprintk("--> nfs_init_server()\n");
681
682 #ifdef CONFIG_NFS_V3
683 if (data->flags & NFS_MOUNT_VER3)
684 cl_init.rpc_ops = &nfs_v3_clientops;
685 #endif
686
687 /* Allocate or find a client reference we can use */
688 clp = nfs_get_client(&cl_init);
689 if (IS_ERR(clp)) {
690 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
691 return PTR_ERR(clp);
692 }
693
694 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
695 data->timeo, data->retrans);
696 error = nfs_init_client(clp, &timeparms, data);
697 if (error < 0)
698 goto error;
699
700 server->nfs_client = clp;
701
702 /* Initialise the client representation from the mount data */
703 server->flags = data->flags;
704
705 if (data->rsize)
706 server->rsize = nfs_block_size(data->rsize, NULL);
707 if (data->wsize)
708 server->wsize = nfs_block_size(data->wsize, NULL);
709
710 server->acregmin = data->acregmin * HZ;
711 server->acregmax = data->acregmax * HZ;
712 server->acdirmin = data->acdirmin * HZ;
713 server->acdirmax = data->acdirmax * HZ;
714
715 /* Start lockd here, before we might error out */
716 error = nfs_start_lockd(server);
717 if (error < 0)
718 goto error;
719
720 server->port = data->nfs_server.port;
721
722 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
723 if (error < 0)
724 goto error;
725
726 /* Preserve the values of mount_server-related mount options */
727 if (data->mount_server.addrlen) {
728 memcpy(&server->mountd_address, &data->mount_server.address,
729 data->mount_server.addrlen);
730 server->mountd_addrlen = data->mount_server.addrlen;
731 }
732 server->mountd_version = data->mount_server.version;
733 server->mountd_port = data->mount_server.port;
734 server->mountd_protocol = data->mount_server.protocol;
735
736 server->namelen = data->namlen;
737 /* Create a client RPC handle for the NFSv3 ACL management interface */
738 nfs_init_server_aclclient(server);
739 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
740 return 0;
741
742 error:
743 server->nfs_client = NULL;
744 nfs_put_client(clp);
745 dprintk("<-- nfs_init_server() = xerror %d\n", error);
746 return error;
747 }
748
749 /*
750 * Load up the server record from information gained in an fsinfo record
751 */
752 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
753 {
754 unsigned long max_rpc_payload;
755
756 /* Work out a lot of parameters */
757 if (server->rsize == 0)
758 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
759 if (server->wsize == 0)
760 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
761
762 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
763 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
764 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
765 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
766
767 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
768 if (server->rsize > max_rpc_payload)
769 server->rsize = max_rpc_payload;
770 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
771 server->rsize = NFS_MAX_FILE_IO_SIZE;
772 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
773
774 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
775
776 if (server->wsize > max_rpc_payload)
777 server->wsize = max_rpc_payload;
778 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
779 server->wsize = NFS_MAX_FILE_IO_SIZE;
780 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
781 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
782
783 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
784 if (server->dtsize > PAGE_CACHE_SIZE)
785 server->dtsize = PAGE_CACHE_SIZE;
786 if (server->dtsize > server->rsize)
787 server->dtsize = server->rsize;
788
789 if (server->flags & NFS_MOUNT_NOAC) {
790 server->acregmin = server->acregmax = 0;
791 server->acdirmin = server->acdirmax = 0;
792 }
793
794 server->maxfilesize = fsinfo->maxfilesize;
795
796 /* We're airborne Set socket buffersize */
797 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
798 }
799
800 /*
801 * Probe filesystem information, including the FSID on v2/v3
802 */
803 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
804 {
805 struct nfs_fsinfo fsinfo;
806 struct nfs_client *clp = server->nfs_client;
807 int error;
808
809 dprintk("--> nfs_probe_fsinfo()\n");
810
811 if (clp->rpc_ops->set_capabilities != NULL) {
812 error = clp->rpc_ops->set_capabilities(server, mntfh);
813 if (error < 0)
814 goto out_error;
815 }
816
817 fsinfo.fattr = fattr;
818 nfs_fattr_init(fattr);
819 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
820 if (error < 0)
821 goto out_error;
822
823 nfs_server_set_fsinfo(server, &fsinfo);
824 error = bdi_init(&server->backing_dev_info);
825 if (error)
826 goto out_error;
827
828
829 /* Get some general file system info */
830 if (server->namelen == 0) {
831 struct nfs_pathconf pathinfo;
832
833 pathinfo.fattr = fattr;
834 nfs_fattr_init(fattr);
835
836 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
837 server->namelen = pathinfo.max_namelen;
838 }
839
840 dprintk("<-- nfs_probe_fsinfo() = 0\n");
841 return 0;
842
843 out_error:
844 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
845 return error;
846 }
847
848 /*
849 * Copy useful information when duplicating a server record
850 */
851 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
852 {
853 target->flags = source->flags;
854 target->acregmin = source->acregmin;
855 target->acregmax = source->acregmax;
856 target->acdirmin = source->acdirmin;
857 target->acdirmax = source->acdirmax;
858 target->caps = source->caps;
859 }
860
861 /*
862 * Allocate and initialise a server record
863 */
864 static struct nfs_server *nfs_alloc_server(void)
865 {
866 struct nfs_server *server;
867
868 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
869 if (!server)
870 return NULL;
871
872 server->client = server->client_acl = ERR_PTR(-EINVAL);
873
874 /* Zero out the NFS state stuff */
875 INIT_LIST_HEAD(&server->client_link);
876 INIT_LIST_HEAD(&server->master_link);
877
878 atomic_set(&server->active, 0);
879
880 server->io_stats = nfs_alloc_iostats();
881 if (!server->io_stats) {
882 kfree(server);
883 return NULL;
884 }
885
886 return server;
887 }
888
889 /*
890 * Free up a server record
891 */
892 void nfs_free_server(struct nfs_server *server)
893 {
894 dprintk("--> nfs_free_server()\n");
895
896 spin_lock(&nfs_client_lock);
897 list_del(&server->client_link);
898 list_del(&server->master_link);
899 spin_unlock(&nfs_client_lock);
900
901 if (server->destroy != NULL)
902 server->destroy(server);
903
904 if (!IS_ERR(server->client_acl))
905 rpc_shutdown_client(server->client_acl);
906 if (!IS_ERR(server->client))
907 rpc_shutdown_client(server->client);
908
909 nfs_put_client(server->nfs_client);
910
911 nfs_free_iostats(server->io_stats);
912 bdi_destroy(&server->backing_dev_info);
913 kfree(server);
914 nfs_release_automount_timer();
915 dprintk("<-- nfs_free_server()\n");
916 }
917
918 /*
919 * Create a version 2 or 3 volume record
920 * - keyed on server and FSID
921 */
922 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
923 struct nfs_fh *mntfh)
924 {
925 struct nfs_server *server;
926 struct nfs_fattr fattr;
927 int error;
928
929 server = nfs_alloc_server();
930 if (!server)
931 return ERR_PTR(-ENOMEM);
932
933 /* Get a client representation */
934 error = nfs_init_server(server, data);
935 if (error < 0)
936 goto error;
937
938 BUG_ON(!server->nfs_client);
939 BUG_ON(!server->nfs_client->rpc_ops);
940 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
941
942 /* Probe the root fh to retrieve its FSID */
943 error = nfs_probe_fsinfo(server, mntfh, &fattr);
944 if (error < 0)
945 goto error;
946 if (server->nfs_client->rpc_ops->version == 3) {
947 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
948 server->namelen = NFS3_MAXNAMLEN;
949 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
950 server->caps |= NFS_CAP_READDIRPLUS;
951 } else {
952 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
953 server->namelen = NFS2_MAXNAMLEN;
954 }
955
956 if (!(fattr.valid & NFS_ATTR_FATTR)) {
957 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
958 if (error < 0) {
959 dprintk("nfs_create_server: getattr error = %d\n", -error);
960 goto error;
961 }
962 }
963 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
964
965 dprintk("Server FSID: %llx:%llx\n",
966 (unsigned long long) server->fsid.major,
967 (unsigned long long) server->fsid.minor);
968
969 BUG_ON(!server->nfs_client);
970 BUG_ON(!server->nfs_client->rpc_ops);
971 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
972
973 spin_lock(&nfs_client_lock);
974 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
975 list_add_tail(&server->master_link, &nfs_volume_list);
976 spin_unlock(&nfs_client_lock);
977
978 server->mount_time = jiffies;
979 return server;
980
981 error:
982 nfs_free_server(server);
983 return ERR_PTR(error);
984 }
985
986 #ifdef CONFIG_NFS_V4
987 /*
988 * Initialise an NFS4 client record
989 */
990 static int nfs4_init_client(struct nfs_client *clp,
991 const struct rpc_timeout *timeparms,
992 const char *ip_addr,
993 rpc_authflavor_t authflavour,
994 int flags)
995 {
996 int error;
997
998 if (clp->cl_cons_state == NFS_CS_READY) {
999 /* the client is initialised already */
1000 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1001 return 0;
1002 }
1003
1004 /* Check NFS protocol revision and initialize RPC op vector */
1005 clp->rpc_ops = &nfs_v4_clientops;
1006
1007 error = nfs_create_rpc_client(clp, timeparms, authflavour,
1008 1, flags & NFS_MOUNT_NORESVPORT);
1009 if (error < 0)
1010 goto error;
1011 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1012
1013 error = nfs_idmap_new(clp);
1014 if (error < 0) {
1015 dprintk("%s: failed to create idmapper. Error = %d\n",
1016 __func__, error);
1017 goto error;
1018 }
1019 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1020
1021 nfs_mark_client_ready(clp, NFS_CS_READY);
1022 return 0;
1023
1024 error:
1025 nfs_mark_client_ready(clp, error);
1026 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1027 return error;
1028 }
1029
1030 /*
1031 * Set up an NFS4 client
1032 */
1033 static int nfs4_set_client(struct nfs_server *server,
1034 const char *hostname,
1035 const struct sockaddr *addr,
1036 const size_t addrlen,
1037 const char *ip_addr,
1038 rpc_authflavor_t authflavour,
1039 int proto, const struct rpc_timeout *timeparms)
1040 {
1041 struct nfs_client_initdata cl_init = {
1042 .hostname = hostname,
1043 .addr = addr,
1044 .addrlen = addrlen,
1045 .rpc_ops = &nfs_v4_clientops,
1046 .proto = proto,
1047 };
1048 struct nfs_client *clp;
1049 int error;
1050
1051 dprintk("--> nfs4_set_client()\n");
1052
1053 /* Allocate or find a client reference we can use */
1054 clp = nfs_get_client(&cl_init);
1055 if (IS_ERR(clp)) {
1056 error = PTR_ERR(clp);
1057 goto error;
1058 }
1059 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1060 server->flags);
1061 if (error < 0)
1062 goto error_put;
1063
1064 server->nfs_client = clp;
1065 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1066 return 0;
1067
1068 error_put:
1069 nfs_put_client(clp);
1070 error:
1071 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1072 return error;
1073 }
1074
1075 /*
1076 * Create a version 4 volume record
1077 */
1078 static int nfs4_init_server(struct nfs_server *server,
1079 const struct nfs_parsed_mount_data *data)
1080 {
1081 struct rpc_timeout timeparms;
1082 int error;
1083
1084 dprintk("--> nfs4_init_server()\n");
1085
1086 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1087 data->timeo, data->retrans);
1088
1089 /* Initialise the client representation from the mount data */
1090 server->flags = data->flags;
1091 server->caps |= NFS_CAP_ATOMIC_OPEN;
1092
1093 /* Get a client record */
1094 error = nfs4_set_client(server,
1095 data->nfs_server.hostname,
1096 (const struct sockaddr *)&data->nfs_server.address,
1097 data->nfs_server.addrlen,
1098 data->client_address,
1099 data->auth_flavors[0],
1100 data->nfs_server.protocol,
1101 &timeparms);
1102 if (error < 0)
1103 goto error;
1104
1105 if (data->rsize)
1106 server->rsize = nfs_block_size(data->rsize, NULL);
1107 if (data->wsize)
1108 server->wsize = nfs_block_size(data->wsize, NULL);
1109
1110 server->acregmin = data->acregmin * HZ;
1111 server->acregmax = data->acregmax * HZ;
1112 server->acdirmin = data->acdirmin * HZ;
1113 server->acdirmax = data->acdirmax * HZ;
1114
1115 server->port = data->nfs_server.port;
1116
1117 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1118
1119 error:
1120 /* Done */
1121 dprintk("<-- nfs4_init_server() = %d\n", error);
1122 return error;
1123 }
1124
1125 /*
1126 * Create a version 4 volume record
1127 * - keyed on server and FSID
1128 */
1129 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1130 struct nfs_fh *mntfh)
1131 {
1132 struct nfs_fattr fattr;
1133 struct nfs_server *server;
1134 int error;
1135
1136 dprintk("--> nfs4_create_server()\n");
1137
1138 server = nfs_alloc_server();
1139 if (!server)
1140 return ERR_PTR(-ENOMEM);
1141
1142 /* set up the general RPC client */
1143 error = nfs4_init_server(server, data);
1144 if (error < 0)
1145 goto error;
1146
1147 BUG_ON(!server->nfs_client);
1148 BUG_ON(!server->nfs_client->rpc_ops);
1149 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1150
1151 /* Probe the root fh to retrieve its FSID */
1152 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1153 if (error < 0)
1154 goto error;
1155
1156 dprintk("Server FSID: %llx:%llx\n",
1157 (unsigned long long) server->fsid.major,
1158 (unsigned long long) server->fsid.minor);
1159 dprintk("Mount FH: %d\n", mntfh->size);
1160
1161 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1162 if (error < 0)
1163 goto error;
1164
1165 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1166 server->namelen = NFS4_MAXNAMLEN;
1167
1168 BUG_ON(!server->nfs_client);
1169 BUG_ON(!server->nfs_client->rpc_ops);
1170 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1171
1172 spin_lock(&nfs_client_lock);
1173 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1174 list_add_tail(&server->master_link, &nfs_volume_list);
1175 spin_unlock(&nfs_client_lock);
1176
1177 server->mount_time = jiffies;
1178 dprintk("<-- nfs4_create_server() = %p\n", server);
1179 return server;
1180
1181 error:
1182 nfs_free_server(server);
1183 dprintk("<-- nfs4_create_server() = error %d\n", error);
1184 return ERR_PTR(error);
1185 }
1186
1187 /*
1188 * Create an NFS4 referral server record
1189 */
1190 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1191 struct nfs_fh *mntfh)
1192 {
1193 struct nfs_client *parent_client;
1194 struct nfs_server *server, *parent_server;
1195 struct nfs_fattr fattr;
1196 int error;
1197
1198 dprintk("--> nfs4_create_referral_server()\n");
1199
1200 server = nfs_alloc_server();
1201 if (!server)
1202 return ERR_PTR(-ENOMEM);
1203
1204 parent_server = NFS_SB(data->sb);
1205 parent_client = parent_server->nfs_client;
1206
1207 /* Initialise the client representation from the parent server */
1208 nfs_server_copy_userdata(server, parent_server);
1209 server->caps |= NFS_CAP_ATOMIC_OPEN;
1210
1211 /* Get a client representation.
1212 * Note: NFSv4 always uses TCP, */
1213 error = nfs4_set_client(server, data->hostname,
1214 data->addr,
1215 data->addrlen,
1216 parent_client->cl_ipaddr,
1217 data->authflavor,
1218 parent_server->client->cl_xprt->prot,
1219 parent_server->client->cl_timeout);
1220 if (error < 0)
1221 goto error;
1222
1223 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1224 if (error < 0)
1225 goto error;
1226
1227 BUG_ON(!server->nfs_client);
1228 BUG_ON(!server->nfs_client->rpc_ops);
1229 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1230
1231 /* Probe the root fh to retrieve its FSID and filehandle */
1232 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1233 if (error < 0)
1234 goto error;
1235
1236 /* probe the filesystem info for this server filesystem */
1237 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1238 if (error < 0)
1239 goto error;
1240
1241 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1242 server->namelen = NFS4_MAXNAMLEN;
1243
1244 dprintk("Referral FSID: %llx:%llx\n",
1245 (unsigned long long) server->fsid.major,
1246 (unsigned long long) server->fsid.minor);
1247
1248 spin_lock(&nfs_client_lock);
1249 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1250 list_add_tail(&server->master_link, &nfs_volume_list);
1251 spin_unlock(&nfs_client_lock);
1252
1253 server->mount_time = jiffies;
1254
1255 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1256 return server;
1257
1258 error:
1259 nfs_free_server(server);
1260 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1261 return ERR_PTR(error);
1262 }
1263
1264 #endif /* CONFIG_NFS_V4 */
1265
1266 /*
1267 * Clone an NFS2, NFS3 or NFS4 server record
1268 */
1269 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1270 struct nfs_fh *fh,
1271 struct nfs_fattr *fattr)
1272 {
1273 struct nfs_server *server;
1274 struct nfs_fattr fattr_fsinfo;
1275 int error;
1276
1277 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1278 (unsigned long long) fattr->fsid.major,
1279 (unsigned long long) fattr->fsid.minor);
1280
1281 server = nfs_alloc_server();
1282 if (!server)
1283 return ERR_PTR(-ENOMEM);
1284
1285 /* Copy data from the source */
1286 server->nfs_client = source->nfs_client;
1287 atomic_inc(&server->nfs_client->cl_count);
1288 nfs_server_copy_userdata(server, source);
1289
1290 server->fsid = fattr->fsid;
1291
1292 error = nfs_init_server_rpcclient(server,
1293 source->client->cl_timeout,
1294 source->client->cl_auth->au_flavor);
1295 if (error < 0)
1296 goto out_free_server;
1297 if (!IS_ERR(source->client_acl))
1298 nfs_init_server_aclclient(server);
1299
1300 /* probe the filesystem info for this server filesystem */
1301 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1302 if (error < 0)
1303 goto out_free_server;
1304
1305 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1306 server->namelen = NFS4_MAXNAMLEN;
1307
1308 dprintk("Cloned FSID: %llx:%llx\n",
1309 (unsigned long long) server->fsid.major,
1310 (unsigned long long) server->fsid.minor);
1311
1312 error = nfs_start_lockd(server);
1313 if (error < 0)
1314 goto out_free_server;
1315
1316 spin_lock(&nfs_client_lock);
1317 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1318 list_add_tail(&server->master_link, &nfs_volume_list);
1319 spin_unlock(&nfs_client_lock);
1320
1321 server->mount_time = jiffies;
1322
1323 dprintk("<-- nfs_clone_server() = %p\n", server);
1324 return server;
1325
1326 out_free_server:
1327 nfs_free_server(server);
1328 dprintk("<-- nfs_clone_server() = error %d\n", error);
1329 return ERR_PTR(error);
1330 }
1331
1332 #ifdef CONFIG_PROC_FS
1333 static struct proc_dir_entry *proc_fs_nfs;
1334
1335 static int nfs_server_list_open(struct inode *inode, struct file *file);
1336 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1337 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1338 static void nfs_server_list_stop(struct seq_file *p, void *v);
1339 static int nfs_server_list_show(struct seq_file *m, void *v);
1340
1341 static struct seq_operations nfs_server_list_ops = {
1342 .start = nfs_server_list_start,
1343 .next = nfs_server_list_next,
1344 .stop = nfs_server_list_stop,
1345 .show = nfs_server_list_show,
1346 };
1347
1348 static const struct file_operations nfs_server_list_fops = {
1349 .open = nfs_server_list_open,
1350 .read = seq_read,
1351 .llseek = seq_lseek,
1352 .release = seq_release,
1353 .owner = THIS_MODULE,
1354 };
1355
1356 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1357 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1358 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1359 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1360 static int nfs_volume_list_show(struct seq_file *m, void *v);
1361
1362 static struct seq_operations nfs_volume_list_ops = {
1363 .start = nfs_volume_list_start,
1364 .next = nfs_volume_list_next,
1365 .stop = nfs_volume_list_stop,
1366 .show = nfs_volume_list_show,
1367 };
1368
1369 static const struct file_operations nfs_volume_list_fops = {
1370 .open = nfs_volume_list_open,
1371 .read = seq_read,
1372 .llseek = seq_lseek,
1373 .release = seq_release,
1374 .owner = THIS_MODULE,
1375 };
1376
1377 /*
1378 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1379 * we're dealing
1380 */
1381 static int nfs_server_list_open(struct inode *inode, struct file *file)
1382 {
1383 struct seq_file *m;
1384 int ret;
1385
1386 ret = seq_open(file, &nfs_server_list_ops);
1387 if (ret < 0)
1388 return ret;
1389
1390 m = file->private_data;
1391 m->private = PDE(inode)->data;
1392
1393 return 0;
1394 }
1395
1396 /*
1397 * set up the iterator to start reading from the server list and return the first item
1398 */
1399 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1400 {
1401 /* lock the list against modification */
1402 spin_lock(&nfs_client_lock);
1403 return seq_list_start_head(&nfs_client_list, *_pos);
1404 }
1405
1406 /*
1407 * move to next server
1408 */
1409 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1410 {
1411 return seq_list_next(v, &nfs_client_list, pos);
1412 }
1413
1414 /*
1415 * clean up after reading from the transports list
1416 */
1417 static void nfs_server_list_stop(struct seq_file *p, void *v)
1418 {
1419 spin_unlock(&nfs_client_lock);
1420 }
1421
1422 /*
1423 * display a header line followed by a load of call lines
1424 */
1425 static int nfs_server_list_show(struct seq_file *m, void *v)
1426 {
1427 struct nfs_client *clp;
1428
1429 /* display header on line 1 */
1430 if (v == &nfs_client_list) {
1431 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1432 return 0;
1433 }
1434
1435 /* display one transport per line on subsequent lines */
1436 clp = list_entry(v, struct nfs_client, cl_share_link);
1437
1438 seq_printf(m, "v%u %s %s %3d %s\n",
1439 clp->rpc_ops->version,
1440 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1441 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1442 atomic_read(&clp->cl_count),
1443 clp->cl_hostname);
1444
1445 return 0;
1446 }
1447
1448 /*
1449 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1450 */
1451 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1452 {
1453 struct seq_file *m;
1454 int ret;
1455
1456 ret = seq_open(file, &nfs_volume_list_ops);
1457 if (ret < 0)
1458 return ret;
1459
1460 m = file->private_data;
1461 m->private = PDE(inode)->data;
1462
1463 return 0;
1464 }
1465
1466 /*
1467 * set up the iterator to start reading from the volume list and return the first item
1468 */
1469 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1470 {
1471 /* lock the list against modification */
1472 spin_lock(&nfs_client_lock);
1473 return seq_list_start_head(&nfs_volume_list, *_pos);
1474 }
1475
1476 /*
1477 * move to next volume
1478 */
1479 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1480 {
1481 return seq_list_next(v, &nfs_volume_list, pos);
1482 }
1483
1484 /*
1485 * clean up after reading from the transports list
1486 */
1487 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1488 {
1489 spin_unlock(&nfs_client_lock);
1490 }
1491
1492 /*
1493 * display a header line followed by a load of call lines
1494 */
1495 static int nfs_volume_list_show(struct seq_file *m, void *v)
1496 {
1497 struct nfs_server *server;
1498 struct nfs_client *clp;
1499 char dev[8], fsid[17];
1500
1501 /* display header on line 1 */
1502 if (v == &nfs_volume_list) {
1503 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1504 return 0;
1505 }
1506 /* display one transport per line on subsequent lines */
1507 server = list_entry(v, struct nfs_server, master_link);
1508 clp = server->nfs_client;
1509
1510 snprintf(dev, 8, "%u:%u",
1511 MAJOR(server->s_dev), MINOR(server->s_dev));
1512
1513 snprintf(fsid, 17, "%llx:%llx",
1514 (unsigned long long) server->fsid.major,
1515 (unsigned long long) server->fsid.minor);
1516
1517 seq_printf(m, "v%u %s %s %-7s %-17s\n",
1518 clp->rpc_ops->version,
1519 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1520 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1521 dev,
1522 fsid);
1523
1524 return 0;
1525 }
1526
1527 /*
1528 * initialise the /proc/fs/nfsfs/ directory
1529 */
1530 int __init nfs_fs_proc_init(void)
1531 {
1532 struct proc_dir_entry *p;
1533
1534 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1535 if (!proc_fs_nfs)
1536 goto error_0;
1537
1538 proc_fs_nfs->owner = THIS_MODULE;
1539
1540 /* a file of servers with which we're dealing */
1541 p = proc_create("servers", S_IFREG|S_IRUGO,
1542 proc_fs_nfs, &nfs_server_list_fops);
1543 if (!p)
1544 goto error_1;
1545
1546 /* a file of volumes that we have mounted */
1547 p = proc_create("volumes", S_IFREG|S_IRUGO,
1548 proc_fs_nfs, &nfs_volume_list_fops);
1549 if (!p)
1550 goto error_2;
1551 return 0;
1552
1553 error_2:
1554 remove_proc_entry("servers", proc_fs_nfs);
1555 error_1:
1556 remove_proc_entry("fs/nfsfs", NULL);
1557 error_0:
1558 return -ENOMEM;
1559 }
1560
1561 /*
1562 * clean up the /proc/fs/nfsfs/ directory
1563 */
1564 void nfs_fs_proc_exit(void)
1565 {
1566 remove_proc_entry("volumes", proc_fs_nfs);
1567 remove_proc_entry("servers", proc_fs_nfs);
1568 remove_proc_entry("fs/nfsfs", NULL);
1569 }
1570
1571 #endif /* CONFIG_PROC_FS */
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