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hugetlb: override default huge page size
[linux-2.6/openmoko-kernel.git] / fs / nfs / client.c
blob5ee23e7058b305c061a4e1449fdccc722a68eceb
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_rwsem(&clp->cl_sem);
147 INIT_LIST_HEAD(&clp->cl_delegations);
148 spin_lock_init(&clp->cl_lock);
149 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
150 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
151 clp->cl_boot_time = CURRENT_TIME;
152 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
153 #endif
154 cred = rpc_lookup_machine_cred();
155 if (!IS_ERR(cred))
156 clp->cl_machine_cred = cred;
157
158 return clp;
159
160 error_3:
161 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
162 nfs_callback_down();
163 error_2:
164 kfree(clp);
165 error_0:
166 return NULL;
167 }
168
169 static void nfs4_shutdown_client(struct nfs_client *clp)
170 {
171 #ifdef CONFIG_NFS_V4
172 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
173 nfs4_kill_renewd(clp);
174 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
175 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
176 nfs_idmap_delete(clp);
177
178 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
179 #endif
180 }
181
182 /*
183 * Destroy a shared client record
184 */
185 static void nfs_free_client(struct nfs_client *clp)
186 {
187 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
188
189 nfs4_shutdown_client(clp);
190
191 /* -EIO all pending I/O */
192 if (!IS_ERR(clp->cl_rpcclient))
193 rpc_shutdown_client(clp->cl_rpcclient);
194
195 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
196 nfs_callback_down();
197
198 if (clp->cl_machine_cred != NULL)
199 put_rpccred(clp->cl_machine_cred);
200
201 kfree(clp->cl_hostname);
202 kfree(clp);
203
204 dprintk("<-- nfs_free_client()\n");
205 }
206
207 /*
208 * Release a reference to a shared client record
209 */
210 void nfs_put_client(struct nfs_client *clp)
211 {
212 if (!clp)
213 return;
214
215 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
216
217 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
218 list_del(&clp->cl_share_link);
219 spin_unlock(&nfs_client_lock);
220
221 BUG_ON(!list_empty(&clp->cl_superblocks));
222
223 nfs_free_client(clp);
224 }
225 }
226
227 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
228 const struct sockaddr_in *sa2)
229 {
230 return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
231 }
232
233 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr_in6 *sa1,
234 const struct sockaddr_in6 *sa2)
235 {
236 return ipv6_addr_equal(&sa1->sin6_addr, &sa2->sin6_addr);
237 }
238
239 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
240 const struct sockaddr *sa2)
241 {
242 switch (sa1->sa_family) {
243 case AF_INET:
244 return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
245 (const struct sockaddr_in *)sa2);
246 case AF_INET6:
247 return nfs_sockaddr_match_ipaddr6((const struct sockaddr_in6 *)sa1,
248 (const struct sockaddr_in6 *)sa2);
249 }
250 BUG();
251 }
252
253 /*
254 * Find a client by IP address and protocol version
255 * - returns NULL if no such client
256 */
257 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
258 {
259 struct nfs_client *clp;
260
261 spin_lock(&nfs_client_lock);
262 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
263 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
264
265 /* Don't match clients that failed to initialise properly */
266 if (clp->cl_cons_state != NFS_CS_READY)
267 continue;
268
269 /* Different NFS versions cannot share the same nfs_client */
270 if (clp->rpc_ops->version != nfsversion)
271 continue;
272
273 if (addr->sa_family != clap->sa_family)
274 continue;
275 /* Match only the IP address, not the port number */
276 if (!nfs_sockaddr_match_ipaddr(addr, clap))
277 continue;
278
279 atomic_inc(&clp->cl_count);
280 spin_unlock(&nfs_client_lock);
281 return clp;
282 }
283 spin_unlock(&nfs_client_lock);
284 return NULL;
285 }
286
287 /*
288 * Find a client by IP address and protocol version
289 * - returns NULL if no such client
290 */
291 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
292 {
293 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
294 u32 nfsvers = clp->rpc_ops->version;
295
296 spin_lock(&nfs_client_lock);
297 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
298 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
299
300 /* Don't match clients that failed to initialise properly */
301 if (clp->cl_cons_state != NFS_CS_READY)
302 continue;
303
304 /* Different NFS versions cannot share the same nfs_client */
305 if (clp->rpc_ops->version != nfsvers)
306 continue;
307
308 if (sap->sa_family != clap->sa_family)
309 continue;
310 /* Match only the IP address, not the port number */
311 if (!nfs_sockaddr_match_ipaddr(sap, clap))
312 continue;
313
314 atomic_inc(&clp->cl_count);
315 spin_unlock(&nfs_client_lock);
316 return clp;
317 }
318 spin_unlock(&nfs_client_lock);
319 return NULL;
320 }
321
322 /*
323 * Find an nfs_client on the list that matches the initialisation data
324 * that is supplied.
325 */
326 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
327 {
328 struct nfs_client *clp;
329
330 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
331 /* Don't match clients that failed to initialise properly */
332 if (clp->cl_cons_state < 0)
333 continue;
334
335 /* Different NFS versions cannot share the same nfs_client */
336 if (clp->rpc_ops != data->rpc_ops)
337 continue;
338
339 if (clp->cl_proto != data->proto)
340 continue;
341
342 /* Match the full socket address */
343 if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
344 continue;
345
346 atomic_inc(&clp->cl_count);
347 return clp;
348 }
349 return NULL;
350 }
351
352 /*
353 * Look up a client by IP address and protocol version
354 * - creates a new record if one doesn't yet exist
355 */
356 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
357 {
358 struct nfs_client *clp, *new = NULL;
359 int error;
360
361 dprintk("--> nfs_get_client(%s,v%u)\n",
362 cl_init->hostname ?: "", cl_init->rpc_ops->version);
363
364 /* see if the client already exists */
365 do {
366 spin_lock(&nfs_client_lock);
367
368 clp = nfs_match_client(cl_init);
369 if (clp)
370 goto found_client;
371 if (new)
372 goto install_client;
373
374 spin_unlock(&nfs_client_lock);
375
376 new = nfs_alloc_client(cl_init);
377 } while (new);
378
379 return ERR_PTR(-ENOMEM);
380
381 /* install a new client and return with it unready */
382 install_client:
383 clp = new;
384 list_add(&clp->cl_share_link, &nfs_client_list);
385 spin_unlock(&nfs_client_lock);
386 dprintk("--> nfs_get_client() = %p [new]\n", clp);
387 return clp;
388
389 /* found an existing client
390 * - make sure it's ready before returning
391 */
392 found_client:
393 spin_unlock(&nfs_client_lock);
394
395 if (new)
396 nfs_free_client(new);
397
398 error = wait_event_killable(nfs_client_active_wq,
399 clp->cl_cons_state != NFS_CS_INITING);
400 if (error < 0) {
401 nfs_put_client(clp);
402 return ERR_PTR(-ERESTARTSYS);
403 }
404
405 if (clp->cl_cons_state < NFS_CS_READY) {
406 error = clp->cl_cons_state;
407 nfs_put_client(clp);
408 return ERR_PTR(error);
409 }
410
411 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
412
413 dprintk("--> nfs_get_client() = %p [share]\n", clp);
414 return clp;
415 }
416
417 /*
418 * Mark a server as ready or failed
419 */
420 static void nfs_mark_client_ready(struct nfs_client *clp, int state)
421 {
422 clp->cl_cons_state = state;
423 wake_up_all(&nfs_client_active_wq);
424 }
425
426 /*
427 * Initialise the timeout values for a connection
428 */
429 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
430 unsigned int timeo, unsigned int retrans)
431 {
432 to->to_initval = timeo * HZ / 10;
433 to->to_retries = retrans;
434
435 switch (proto) {
436 case XPRT_TRANSPORT_TCP:
437 case XPRT_TRANSPORT_RDMA:
438 if (to->to_retries == 0)
439 to->to_retries = NFS_DEF_TCP_RETRANS;
440 if (to->to_initval == 0)
441 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
442 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
443 to->to_initval = NFS_MAX_TCP_TIMEOUT;
444 to->to_increment = to->to_initval;
445 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
446 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
447 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
448 if (to->to_maxval < to->to_initval)
449 to->to_maxval = to->to_initval;
450 to->to_exponential = 0;
451 break;
452 case XPRT_TRANSPORT_UDP:
453 if (to->to_retries == 0)
454 to->to_retries = NFS_DEF_UDP_RETRANS;
455 if (!to->to_initval)
456 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
457 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
458 to->to_initval = NFS_MAX_UDP_TIMEOUT;
459 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
460 to->to_exponential = 1;
461 break;
462 default:
463 BUG();
464 }
465 }
466
467 /*
468 * Create an RPC client handle
469 */
470 static int nfs_create_rpc_client(struct nfs_client *clp,
471 const struct rpc_timeout *timeparms,
472 rpc_authflavor_t flavor,
473 int flags)
474 {
475 struct rpc_clnt *clnt = NULL;
476 struct rpc_create_args args = {
477 .protocol = clp->cl_proto,
478 .address = (struct sockaddr *)&clp->cl_addr,
479 .addrsize = clp->cl_addrlen,
480 .timeout = timeparms,
481 .servername = clp->cl_hostname,
482 .program = &nfs_program,
483 .version = clp->rpc_ops->version,
484 .authflavor = flavor,
485 .flags = flags,
486 };
487
488 if (!IS_ERR(clp->cl_rpcclient))
489 return 0;
490
491 clnt = rpc_create(&args);
492 if (IS_ERR(clnt)) {
493 dprintk("%s: cannot create RPC client. Error = %ld\n",
494 __func__, PTR_ERR(clnt));
495 return PTR_ERR(clnt);
496 }
497
498 clp->cl_rpcclient = clnt;
499 return 0;
500 }
501
502 /*
503 * Version 2 or 3 client destruction
504 */
505 static void nfs_destroy_server(struct nfs_server *server)
506 {
507 if (!(server->flags & NFS_MOUNT_NONLM))
508 nlmclnt_done(server->nlm_host);
509 }
510
511 /*
512 * Version 2 or 3 lockd setup
513 */
514 static int nfs_start_lockd(struct nfs_server *server)
515 {
516 struct nlm_host *host;
517 struct nfs_client *clp = server->nfs_client;
518 struct nlmclnt_initdata nlm_init = {
519 .hostname = clp->cl_hostname,
520 .address = (struct sockaddr *)&clp->cl_addr,
521 .addrlen = clp->cl_addrlen,
522 .protocol = server->flags & NFS_MOUNT_TCP ?
523 IPPROTO_TCP : IPPROTO_UDP,
524 .nfs_version = clp->rpc_ops->version,
525 };
526
527 if (nlm_init.nfs_version > 3)
528 return 0;
529 if (server->flags & NFS_MOUNT_NONLM)
530 return 0;
531
532 host = nlmclnt_init(&nlm_init);
533 if (IS_ERR(host))
534 return PTR_ERR(host);
535
536 server->nlm_host = host;
537 server->destroy = nfs_destroy_server;
538 return 0;
539 }
540
541 /*
542 * Initialise an NFSv3 ACL client connection
543 */
544 #ifdef CONFIG_NFS_V3_ACL
545 static void nfs_init_server_aclclient(struct nfs_server *server)
546 {
547 if (server->nfs_client->rpc_ops->version != 3)
548 goto out_noacl;
549 if (server->flags & NFS_MOUNT_NOACL)
550 goto out_noacl;
551
552 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
553 if (IS_ERR(server->client_acl))
554 goto out_noacl;
555
556 /* No errors! Assume that Sun nfsacls are supported */
557 server->caps |= NFS_CAP_ACLS;
558 return;
559
560 out_noacl:
561 server->caps &= ~NFS_CAP_ACLS;
562 }
563 #else
564 static inline void nfs_init_server_aclclient(struct nfs_server *server)
565 {
566 server->flags &= ~NFS_MOUNT_NOACL;
567 server->caps &= ~NFS_CAP_ACLS;
568 }
569 #endif
570
571 /*
572 * Create a general RPC client
573 */
574 static int nfs_init_server_rpcclient(struct nfs_server *server,
575 const struct rpc_timeout *timeo,
576 rpc_authflavor_t pseudoflavour)
577 {
578 struct nfs_client *clp = server->nfs_client;
579
580 server->client = rpc_clone_client(clp->cl_rpcclient);
581 if (IS_ERR(server->client)) {
582 dprintk("%s: couldn't create rpc_client!\n", __func__);
583 return PTR_ERR(server->client);
584 }
585
586 memcpy(&server->client->cl_timeout_default,
587 timeo,
588 sizeof(server->client->cl_timeout_default));
589 server->client->cl_timeout = &server->client->cl_timeout_default;
590
591 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
592 struct rpc_auth *auth;
593
594 auth = rpcauth_create(pseudoflavour, server->client);
595 if (IS_ERR(auth)) {
596 dprintk("%s: couldn't create credcache!\n", __func__);
597 return PTR_ERR(auth);
598 }
599 }
600 server->client->cl_softrtry = 0;
601 if (server->flags & NFS_MOUNT_SOFT)
602 server->client->cl_softrtry = 1;
603
604 return 0;
605 }
606
607 /*
608 * Initialise an NFS2 or NFS3 client
609 */
610 static int nfs_init_client(struct nfs_client *clp,
611 const struct rpc_timeout *timeparms,
612 const struct nfs_parsed_mount_data *data)
613 {
614 int error;
615
616 if (clp->cl_cons_state == NFS_CS_READY) {
617 /* the client is already initialised */
618 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
619 return 0;
620 }
621
622 /*
623 * Create a client RPC handle for doing FSSTAT with UNIX auth only
624 * - RFC 2623, sec 2.3.2
625 */
626 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 0);
627 if (error < 0)
628 goto error;
629 nfs_mark_client_ready(clp, NFS_CS_READY);
630 return 0;
631
632 error:
633 nfs_mark_client_ready(clp, error);
634 dprintk("<-- nfs_init_client() = xerror %d\n", error);
635 return error;
636 }
637
638 /*
639 * Create a version 2 or 3 client
640 */
641 static int nfs_init_server(struct nfs_server *server,
642 const struct nfs_parsed_mount_data *data)
643 {
644 struct nfs_client_initdata cl_init = {
645 .hostname = data->nfs_server.hostname,
646 .addr = (const struct sockaddr *)&data->nfs_server.address,
647 .addrlen = data->nfs_server.addrlen,
648 .rpc_ops = &nfs_v2_clientops,
649 .proto = data->nfs_server.protocol,
650 };
651 struct rpc_timeout timeparms;
652 struct nfs_client *clp;
653 int error;
654
655 dprintk("--> nfs_init_server()\n");
656
657 #ifdef CONFIG_NFS_V3
658 if (data->flags & NFS_MOUNT_VER3)
659 cl_init.rpc_ops = &nfs_v3_clientops;
660 #endif
661
662 /* Allocate or find a client reference we can use */
663 clp = nfs_get_client(&cl_init);
664 if (IS_ERR(clp)) {
665 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
666 return PTR_ERR(clp);
667 }
668
669 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
670 data->timeo, data->retrans);
671 error = nfs_init_client(clp, &timeparms, data);
672 if (error < 0)
673 goto error;
674
675 server->nfs_client = clp;
676
677 /* Initialise the client representation from the mount data */
678 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
679
680 if (data->rsize)
681 server->rsize = nfs_block_size(data->rsize, NULL);
682 if (data->wsize)
683 server->wsize = nfs_block_size(data->wsize, NULL);
684
685 server->acregmin = data->acregmin * HZ;
686 server->acregmax = data->acregmax * HZ;
687 server->acdirmin = data->acdirmin * HZ;
688 server->acdirmax = data->acdirmax * HZ;
689
690 /* Start lockd here, before we might error out */
691 error = nfs_start_lockd(server);
692 if (error < 0)
693 goto error;
694
695 server->port = data->nfs_server.port;
696
697 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
698 if (error < 0)
699 goto error;
700
701 /* Preserve the values of mount_server-related mount options */
702 if (data->mount_server.addrlen) {
703 memcpy(&server->mountd_address, &data->mount_server.address,
704 data->mount_server.addrlen);
705 server->mountd_addrlen = data->mount_server.addrlen;
706 }
707 server->mountd_version = data->mount_server.version;
708 server->mountd_port = data->mount_server.port;
709 server->mountd_protocol = data->mount_server.protocol;
710
711 server->namelen = data->namlen;
712 /* Create a client RPC handle for the NFSv3 ACL management interface */
713 nfs_init_server_aclclient(server);
714 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
715 return 0;
716
717 error:
718 server->nfs_client = NULL;
719 nfs_put_client(clp);
720 dprintk("<-- nfs_init_server() = xerror %d\n", error);
721 return error;
722 }
723
724 /*
725 * Load up the server record from information gained in an fsinfo record
726 */
727 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
728 {
729 unsigned long max_rpc_payload;
730
731 /* Work out a lot of parameters */
732 if (server->rsize == 0)
733 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
734 if (server->wsize == 0)
735 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
736
737 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
738 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
739 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
740 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
741
742 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
743 if (server->rsize > max_rpc_payload)
744 server->rsize = max_rpc_payload;
745 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
746 server->rsize = NFS_MAX_FILE_IO_SIZE;
747 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
748
749 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
750
751 if (server->wsize > max_rpc_payload)
752 server->wsize = max_rpc_payload;
753 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
754 server->wsize = NFS_MAX_FILE_IO_SIZE;
755 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
756 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
757
758 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
759 if (server->dtsize > PAGE_CACHE_SIZE)
760 server->dtsize = PAGE_CACHE_SIZE;
761 if (server->dtsize > server->rsize)
762 server->dtsize = server->rsize;
763
764 if (server->flags & NFS_MOUNT_NOAC) {
765 server->acregmin = server->acregmax = 0;
766 server->acdirmin = server->acdirmax = 0;
767 }
768
769 server->maxfilesize = fsinfo->maxfilesize;
770
771 /* We're airborne Set socket buffersize */
772 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
773 }
774
775 /*
776 * Probe filesystem information, including the FSID on v2/v3
777 */
778 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
779 {
780 struct nfs_fsinfo fsinfo;
781 struct nfs_client *clp = server->nfs_client;
782 int error;
783
784 dprintk("--> nfs_probe_fsinfo()\n");
785
786 if (clp->rpc_ops->set_capabilities != NULL) {
787 error = clp->rpc_ops->set_capabilities(server, mntfh);
788 if (error < 0)
789 goto out_error;
790 }
791
792 fsinfo.fattr = fattr;
793 nfs_fattr_init(fattr);
794 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
795 if (error < 0)
796 goto out_error;
797
798 nfs_server_set_fsinfo(server, &fsinfo);
799 error = bdi_init(&server->backing_dev_info);
800 if (error)
801 goto out_error;
802
803
804 /* Get some general file system info */
805 if (server->namelen == 0) {
806 struct nfs_pathconf pathinfo;
807
808 pathinfo.fattr = fattr;
809 nfs_fattr_init(fattr);
810
811 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
812 server->namelen = pathinfo.max_namelen;
813 }
814
815 dprintk("<-- nfs_probe_fsinfo() = 0\n");
816 return 0;
817
818 out_error:
819 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
820 return error;
821 }
822
823 /*
824 * Copy useful information when duplicating a server record
825 */
826 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
827 {
828 target->flags = source->flags;
829 target->acregmin = source->acregmin;
830 target->acregmax = source->acregmax;
831 target->acdirmin = source->acdirmin;
832 target->acdirmax = source->acdirmax;
833 target->caps = source->caps;
834 }
835
836 /*
837 * Allocate and initialise a server record
838 */
839 static struct nfs_server *nfs_alloc_server(void)
840 {
841 struct nfs_server *server;
842
843 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
844 if (!server)
845 return NULL;
846
847 server->client = server->client_acl = ERR_PTR(-EINVAL);
848
849 /* Zero out the NFS state stuff */
850 INIT_LIST_HEAD(&server->client_link);
851 INIT_LIST_HEAD(&server->master_link);
852
853 init_waitqueue_head(&server->active_wq);
854 atomic_set(&server->active, 0);
855
856 server->io_stats = nfs_alloc_iostats();
857 if (!server->io_stats) {
858 kfree(server);
859 return NULL;
860 }
861
862 return server;
863 }
864
865 /*
866 * Free up a server record
867 */
868 void nfs_free_server(struct nfs_server *server)
869 {
870 dprintk("--> nfs_free_server()\n");
871
872 spin_lock(&nfs_client_lock);
873 list_del(&server->client_link);
874 list_del(&server->master_link);
875 spin_unlock(&nfs_client_lock);
876
877 if (server->destroy != NULL)
878 server->destroy(server);
879
880 if (!IS_ERR(server->client_acl))
881 rpc_shutdown_client(server->client_acl);
882 if (!IS_ERR(server->client))
883 rpc_shutdown_client(server->client);
884
885 nfs_put_client(server->nfs_client);
886
887 nfs_free_iostats(server->io_stats);
888 bdi_destroy(&server->backing_dev_info);
889 kfree(server);
890 nfs_release_automount_timer();
891 dprintk("<-- nfs_free_server()\n");
892 }
893
894 /*
895 * Create a version 2 or 3 volume record
896 * - keyed on server and FSID
897 */
898 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
899 struct nfs_fh *mntfh)
900 {
901 struct nfs_server *server;
902 struct nfs_fattr fattr;
903 int error;
904
905 server = nfs_alloc_server();
906 if (!server)
907 return ERR_PTR(-ENOMEM);
908
909 /* Get a client representation */
910 error = nfs_init_server(server, data);
911 if (error < 0)
912 goto error;
913
914 BUG_ON(!server->nfs_client);
915 BUG_ON(!server->nfs_client->rpc_ops);
916 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
917
918 /* Probe the root fh to retrieve its FSID */
919 error = nfs_probe_fsinfo(server, mntfh, &fattr);
920 if (error < 0)
921 goto error;
922 if (server->nfs_client->rpc_ops->version == 3) {
923 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
924 server->namelen = NFS3_MAXNAMLEN;
925 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
926 server->caps |= NFS_CAP_READDIRPLUS;
927 } else {
928 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
929 server->namelen = NFS2_MAXNAMLEN;
930 }
931
932 if (!(fattr.valid & NFS_ATTR_FATTR)) {
933 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
934 if (error < 0) {
935 dprintk("nfs_create_server: getattr error = %d\n", -error);
936 goto error;
937 }
938 }
939 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
940
941 dprintk("Server FSID: %llx:%llx\n",
942 (unsigned long long) server->fsid.major,
943 (unsigned long long) server->fsid.minor);
944
945 BUG_ON(!server->nfs_client);
946 BUG_ON(!server->nfs_client->rpc_ops);
947 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
948
949 spin_lock(&nfs_client_lock);
950 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
951 list_add_tail(&server->master_link, &nfs_volume_list);
952 spin_unlock(&nfs_client_lock);
953
954 server->mount_time = jiffies;
955 return server;
956
957 error:
958 nfs_free_server(server);
959 return ERR_PTR(error);
960 }
961
962 #ifdef CONFIG_NFS_V4
963 /*
964 * Initialise an NFS4 client record
965 */
966 static int nfs4_init_client(struct nfs_client *clp,
967 const struct rpc_timeout *timeparms,
968 const char *ip_addr,
969 rpc_authflavor_t authflavour)
970 {
971 int error;
972
973 if (clp->cl_cons_state == NFS_CS_READY) {
974 /* the client is initialised already */
975 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
976 return 0;
977 }
978
979 /* Check NFS protocol revision and initialize RPC op vector */
980 clp->rpc_ops = &nfs_v4_clientops;
981
982 error = nfs_create_rpc_client(clp, timeparms, authflavour,
983 RPC_CLNT_CREATE_DISCRTRY);
984 if (error < 0)
985 goto error;
986 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
987
988 error = nfs_idmap_new(clp);
989 if (error < 0) {
990 dprintk("%s: failed to create idmapper. Error = %d\n",
991 __func__, error);
992 goto error;
993 }
994 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
995
996 nfs_mark_client_ready(clp, NFS_CS_READY);
997 return 0;
998
999 error:
1000 nfs_mark_client_ready(clp, error);
1001 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1002 return error;
1003 }
1004
1005 /*
1006 * Set up an NFS4 client
1007 */
1008 static int nfs4_set_client(struct nfs_server *server,
1009 const char *hostname,
1010 const struct sockaddr *addr,
1011 const size_t addrlen,
1012 const char *ip_addr,
1013 rpc_authflavor_t authflavour,
1014 int proto, const struct rpc_timeout *timeparms)
1015 {
1016 struct nfs_client_initdata cl_init = {
1017 .hostname = hostname,
1018 .addr = addr,
1019 .addrlen = addrlen,
1020 .rpc_ops = &nfs_v4_clientops,
1021 .proto = proto,
1022 };
1023 struct nfs_client *clp;
1024 int error;
1025
1026 dprintk("--> nfs4_set_client()\n");
1027
1028 /* Allocate or find a client reference we can use */
1029 clp = nfs_get_client(&cl_init);
1030 if (IS_ERR(clp)) {
1031 error = PTR_ERR(clp);
1032 goto error;
1033 }
1034 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour);
1035 if (error < 0)
1036 goto error_put;
1037
1038 server->nfs_client = clp;
1039 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1040 return 0;
1041
1042 error_put:
1043 nfs_put_client(clp);
1044 error:
1045 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1046 return error;
1047 }
1048
1049 /*
1050 * Create a version 4 volume record
1051 */
1052 static int nfs4_init_server(struct nfs_server *server,
1053 const struct nfs_parsed_mount_data *data)
1054 {
1055 struct rpc_timeout timeparms;
1056 int error;
1057
1058 dprintk("--> nfs4_init_server()\n");
1059
1060 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1061 data->timeo, data->retrans);
1062
1063 /* Get a client record */
1064 error = nfs4_set_client(server,
1065 data->nfs_server.hostname,
1066 (const struct sockaddr *)&data->nfs_server.address,
1067 data->nfs_server.addrlen,
1068 data->client_address,
1069 data->auth_flavors[0],
1070 data->nfs_server.protocol,
1071 &timeparms);
1072 if (error < 0)
1073 goto error;
1074
1075 /* Initialise the client representation from the mount data */
1076 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1077 server->caps |= NFS_CAP_ATOMIC_OPEN;
1078
1079 if (data->rsize)
1080 server->rsize = nfs_block_size(data->rsize, NULL);
1081 if (data->wsize)
1082 server->wsize = nfs_block_size(data->wsize, NULL);
1083
1084 server->acregmin = data->acregmin * HZ;
1085 server->acregmax = data->acregmax * HZ;
1086 server->acdirmin = data->acdirmin * HZ;
1087 server->acdirmax = data->acdirmax * HZ;
1088
1089 server->port = data->nfs_server.port;
1090
1091 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1092
1093 error:
1094 /* Done */
1095 dprintk("<-- nfs4_init_server() = %d\n", error);
1096 return error;
1097 }
1098
1099 /*
1100 * Create a version 4 volume record
1101 * - keyed on server and FSID
1102 */
1103 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1104 struct nfs_fh *mntfh)
1105 {
1106 struct nfs_fattr fattr;
1107 struct nfs_server *server;
1108 int error;
1109
1110 dprintk("--> nfs4_create_server()\n");
1111
1112 server = nfs_alloc_server();
1113 if (!server)
1114 return ERR_PTR(-ENOMEM);
1115
1116 /* set up the general RPC client */
1117 error = nfs4_init_server(server, data);
1118 if (error < 0)
1119 goto error;
1120
1121 BUG_ON(!server->nfs_client);
1122 BUG_ON(!server->nfs_client->rpc_ops);
1123 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1124
1125 /* Probe the root fh to retrieve its FSID */
1126 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1127 if (error < 0)
1128 goto error;
1129
1130 dprintk("Server FSID: %llx:%llx\n",
1131 (unsigned long long) server->fsid.major,
1132 (unsigned long long) server->fsid.minor);
1133 dprintk("Mount FH: %d\n", mntfh->size);
1134
1135 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1136 if (error < 0)
1137 goto error;
1138
1139 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1140 server->namelen = NFS4_MAXNAMLEN;
1141
1142 BUG_ON(!server->nfs_client);
1143 BUG_ON(!server->nfs_client->rpc_ops);
1144 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1145
1146 spin_lock(&nfs_client_lock);
1147 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1148 list_add_tail(&server->master_link, &nfs_volume_list);
1149 spin_unlock(&nfs_client_lock);
1150
1151 server->mount_time = jiffies;
1152 dprintk("<-- nfs4_create_server() = %p\n", server);
1153 return server;
1154
1155 error:
1156 nfs_free_server(server);
1157 dprintk("<-- nfs4_create_server() = error %d\n", error);
1158 return ERR_PTR(error);
1159 }
1160
1161 /*
1162 * Create an NFS4 referral server record
1163 */
1164 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1165 struct nfs_fh *mntfh)
1166 {
1167 struct nfs_client *parent_client;
1168 struct nfs_server *server, *parent_server;
1169 struct nfs_fattr fattr;
1170 int error;
1171
1172 dprintk("--> nfs4_create_referral_server()\n");
1173
1174 server = nfs_alloc_server();
1175 if (!server)
1176 return ERR_PTR(-ENOMEM);
1177
1178 parent_server = NFS_SB(data->sb);
1179 parent_client = parent_server->nfs_client;
1180
1181 /* Get a client representation.
1182 * Note: NFSv4 always uses TCP, */
1183 error = nfs4_set_client(server, data->hostname,
1184 data->addr,
1185 data->addrlen,
1186 parent_client->cl_ipaddr,
1187 data->authflavor,
1188 parent_server->client->cl_xprt->prot,
1189 parent_server->client->cl_timeout);
1190 if (error < 0)
1191 goto error;
1192
1193 /* Initialise the client representation from the parent server */
1194 nfs_server_copy_userdata(server, parent_server);
1195 server->caps |= NFS_CAP_ATOMIC_OPEN;
1196
1197 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1198 if (error < 0)
1199 goto error;
1200
1201 BUG_ON(!server->nfs_client);
1202 BUG_ON(!server->nfs_client->rpc_ops);
1203 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1204
1205 /* Probe the root fh to retrieve its FSID and filehandle */
1206 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1207 if (error < 0)
1208 goto error;
1209
1210 /* probe the filesystem info for this server filesystem */
1211 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1212 if (error < 0)
1213 goto error;
1214
1215 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1216 server->namelen = NFS4_MAXNAMLEN;
1217
1218 dprintk("Referral FSID: %llx:%llx\n",
1219 (unsigned long long) server->fsid.major,
1220 (unsigned long long) server->fsid.minor);
1221
1222 spin_lock(&nfs_client_lock);
1223 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1224 list_add_tail(&server->master_link, &nfs_volume_list);
1225 spin_unlock(&nfs_client_lock);
1226
1227 server->mount_time = jiffies;
1228
1229 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1230 return server;
1231
1232 error:
1233 nfs_free_server(server);
1234 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1235 return ERR_PTR(error);
1236 }
1237
1238 #endif /* CONFIG_NFS_V4 */
1239
1240 /*
1241 * Clone an NFS2, NFS3 or NFS4 server record
1242 */
1243 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1244 struct nfs_fh *fh,
1245 struct nfs_fattr *fattr)
1246 {
1247 struct nfs_server *server;
1248 struct nfs_fattr fattr_fsinfo;
1249 int error;
1250
1251 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1252 (unsigned long long) fattr->fsid.major,
1253 (unsigned long long) fattr->fsid.minor);
1254
1255 server = nfs_alloc_server();
1256 if (!server)
1257 return ERR_PTR(-ENOMEM);
1258
1259 /* Copy data from the source */
1260 server->nfs_client = source->nfs_client;
1261 atomic_inc(&server->nfs_client->cl_count);
1262 nfs_server_copy_userdata(server, source);
1263
1264 server->fsid = fattr->fsid;
1265
1266 error = nfs_init_server_rpcclient(server,
1267 source->client->cl_timeout,
1268 source->client->cl_auth->au_flavor);
1269 if (error < 0)
1270 goto out_free_server;
1271 if (!IS_ERR(source->client_acl))
1272 nfs_init_server_aclclient(server);
1273
1274 /* probe the filesystem info for this server filesystem */
1275 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1276 if (error < 0)
1277 goto out_free_server;
1278
1279 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1280 server->namelen = NFS4_MAXNAMLEN;
1281
1282 dprintk("Cloned FSID: %llx:%llx\n",
1283 (unsigned long long) server->fsid.major,
1284 (unsigned long long) server->fsid.minor);
1285
1286 error = nfs_start_lockd(server);
1287 if (error < 0)
1288 goto out_free_server;
1289
1290 spin_lock(&nfs_client_lock);
1291 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1292 list_add_tail(&server->master_link, &nfs_volume_list);
1293 spin_unlock(&nfs_client_lock);
1294
1295 server->mount_time = jiffies;
1296
1297 dprintk("<-- nfs_clone_server() = %p\n", server);
1298 return server;
1299
1300 out_free_server:
1301 nfs_free_server(server);
1302 dprintk("<-- nfs_clone_server() = error %d\n", error);
1303 return ERR_PTR(error);
1304 }
1305
1306 #ifdef CONFIG_PROC_FS
1307 static struct proc_dir_entry *proc_fs_nfs;
1308
1309 static int nfs_server_list_open(struct inode *inode, struct file *file);
1310 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1311 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1312 static void nfs_server_list_stop(struct seq_file *p, void *v);
1313 static int nfs_server_list_show(struct seq_file *m, void *v);
1314
1315 static struct seq_operations nfs_server_list_ops = {
1316 .start = nfs_server_list_start,
1317 .next = nfs_server_list_next,
1318 .stop = nfs_server_list_stop,
1319 .show = nfs_server_list_show,
1320 };
1321
1322 static const struct file_operations nfs_server_list_fops = {
1323 .open = nfs_server_list_open,
1324 .read = seq_read,
1325 .llseek = seq_lseek,
1326 .release = seq_release,
1327 .owner = THIS_MODULE,
1328 };
1329
1330 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1331 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1332 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1333 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1334 static int nfs_volume_list_show(struct seq_file *m, void *v);
1335
1336 static struct seq_operations nfs_volume_list_ops = {
1337 .start = nfs_volume_list_start,
1338 .next = nfs_volume_list_next,
1339 .stop = nfs_volume_list_stop,
1340 .show = nfs_volume_list_show,
1341 };
1342
1343 static const struct file_operations nfs_volume_list_fops = {
1344 .open = nfs_volume_list_open,
1345 .read = seq_read,
1346 .llseek = seq_lseek,
1347 .release = seq_release,
1348 .owner = THIS_MODULE,
1349 };
1350
1351 /*
1352 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1353 * we're dealing
1354 */
1355 static int nfs_server_list_open(struct inode *inode, struct file *file)
1356 {
1357 struct seq_file *m;
1358 int ret;
1359
1360 ret = seq_open(file, &nfs_server_list_ops);
1361 if (ret < 0)
1362 return ret;
1363
1364 m = file->private_data;
1365 m->private = PDE(inode)->data;
1366
1367 return 0;
1368 }
1369
1370 /*
1371 * set up the iterator to start reading from the server list and return the first item
1372 */
1373 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1374 {
1375 /* lock the list against modification */
1376 spin_lock(&nfs_client_lock);
1377 return seq_list_start_head(&nfs_client_list, *_pos);
1378 }
1379
1380 /*
1381 * move to next server
1382 */
1383 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1384 {
1385 return seq_list_next(v, &nfs_client_list, pos);
1386 }
1387
1388 /*
1389 * clean up after reading from the transports list
1390 */
1391 static void nfs_server_list_stop(struct seq_file *p, void *v)
1392 {
1393 spin_unlock(&nfs_client_lock);
1394 }
1395
1396 /*
1397 * display a header line followed by a load of call lines
1398 */
1399 static int nfs_server_list_show(struct seq_file *m, void *v)
1400 {
1401 struct nfs_client *clp;
1402
1403 /* display header on line 1 */
1404 if (v == &nfs_client_list) {
1405 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1406 return 0;
1407 }
1408
1409 /* display one transport per line on subsequent lines */
1410 clp = list_entry(v, struct nfs_client, cl_share_link);
1411
1412 seq_printf(m, "v%u %s %s %3d %s\n",
1413 clp->rpc_ops->version,
1414 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1415 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1416 atomic_read(&clp->cl_count),
1417 clp->cl_hostname);
1418
1419 return 0;
1420 }
1421
1422 /*
1423 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1424 */
1425 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1426 {
1427 struct seq_file *m;
1428 int ret;
1429
1430 ret = seq_open(file, &nfs_volume_list_ops);
1431 if (ret < 0)
1432 return ret;
1433
1434 m = file->private_data;
1435 m->private = PDE(inode)->data;
1436
1437 return 0;
1438 }
1439
1440 /*
1441 * set up the iterator to start reading from the volume list and return the first item
1442 */
1443 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1444 {
1445 /* lock the list against modification */
1446 spin_lock(&nfs_client_lock);
1447 return seq_list_start_head(&nfs_volume_list, *_pos);
1448 }
1449
1450 /*
1451 * move to next volume
1452 */
1453 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1454 {
1455 return seq_list_next(v, &nfs_volume_list, pos);
1456 }
1457
1458 /*
1459 * clean up after reading from the transports list
1460 */
1461 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1462 {
1463 spin_unlock(&nfs_client_lock);
1464 }
1465
1466 /*
1467 * display a header line followed by a load of call lines
1468 */
1469 static int nfs_volume_list_show(struct seq_file *m, void *v)
1470 {
1471 struct nfs_server *server;
1472 struct nfs_client *clp;
1473 char dev[8], fsid[17];
1474
1475 /* display header on line 1 */
1476 if (v == &nfs_volume_list) {
1477 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1478 return 0;
1479 }
1480 /* display one transport per line on subsequent lines */
1481 server = list_entry(v, struct nfs_server, master_link);
1482 clp = server->nfs_client;
1483
1484 snprintf(dev, 8, "%u:%u",
1485 MAJOR(server->s_dev), MINOR(server->s_dev));
1486
1487 snprintf(fsid, 17, "%llx:%llx",
1488 (unsigned long long) server->fsid.major,
1489 (unsigned long long) server->fsid.minor);
1490
1491 seq_printf(m, "v%u %s %s %-7s %-17s\n",
1492 clp->rpc_ops->version,
1493 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1494 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1495 dev,
1496 fsid);
1497
1498 return 0;
1499 }
1500
1501 /*
1502 * initialise the /proc/fs/nfsfs/ directory
1503 */
1504 int __init nfs_fs_proc_init(void)
1505 {
1506 struct proc_dir_entry *p;
1507
1508 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1509 if (!proc_fs_nfs)
1510 goto error_0;
1511
1512 proc_fs_nfs->owner = THIS_MODULE;
1513
1514 /* a file of servers with which we're dealing */
1515 p = proc_create("servers", S_IFREG|S_IRUGO,
1516 proc_fs_nfs, &nfs_server_list_fops);
1517 if (!p)
1518 goto error_1;
1519
1520 /* a file of volumes that we have mounted */
1521 p = proc_create("volumes", S_IFREG|S_IRUGO,
1522 proc_fs_nfs, &nfs_volume_list_fops);
1523 if (!p)
1524 goto error_2;
1525 return 0;
1526
1527 error_2:
1528 remove_proc_entry("servers", proc_fs_nfs);
1529 error_1:
1530 remove_proc_entry("fs/nfsfs", NULL);
1531 error_0:
1532 return -ENOMEM;
1533 }
1534
1535 /*
1536 * clean up the /proc/fs/nfsfs/ directory
1537 */
1538 void nfs_fs_proc_exit(void)
1539 {
1540 remove_proc_entry("volumes", proc_fs_nfs);
1541 remove_proc_entry("servers", proc_fs_nfs);
1542 remove_proc_entry("fs/nfsfs", NULL);
1543 }
1544
1545 #endif /* CONFIG_PROC_FS */
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