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NFS: Save the value of the "port=" mount option
[deliverable/linux.git] / fs / nfs / client.c
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
116 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
117 goto error_0;
118
119 clp->rpc_ops = cl_init->rpc_ops;
120
121 if (cl_init->rpc_ops->version == 4) {
122 if (nfs_callback_up() < 0)
123 goto error_2;
124 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
125 }
126
127 atomic_set(&clp->cl_count, 1);
128 clp->cl_cons_state = NFS_CS_INITING;
129
130 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
131 clp->cl_addrlen = cl_init->addrlen;
132
133 if (cl_init->hostname) {
134 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
135 if (!clp->cl_hostname)
136 goto error_3;
137 }
138
139 INIT_LIST_HEAD(&clp->cl_superblocks);
140 clp->cl_rpcclient = ERR_PTR(-EINVAL);
141
142 clp->cl_proto = cl_init->proto;
143
144 #ifdef CONFIG_NFS_V4
145 init_rwsem(&clp->cl_sem);
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
154 return clp;
155
156 error_3:
157 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
158 nfs_callback_down();
159 error_2:
160 kfree(clp);
161 error_0:
162 return NULL;
163 }
164
165 static void nfs4_shutdown_client(struct nfs_client *clp)
166 {
167 #ifdef CONFIG_NFS_V4
168 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
169 nfs4_kill_renewd(clp);
170 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
171 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
172 nfs_idmap_delete(clp);
173
174 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
175 #endif
176 }
177
178 /*
179 * Destroy a shared client record
180 */
181 static void nfs_free_client(struct nfs_client *clp)
182 {
183 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
184
185 nfs4_shutdown_client(clp);
186
187 /* -EIO all pending I/O */
188 if (!IS_ERR(clp->cl_rpcclient))
189 rpc_shutdown_client(clp->cl_rpcclient);
190
191 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
192 nfs_callback_down();
193
194 kfree(clp->cl_hostname);
195 kfree(clp);
196
197 dprintk("<-- nfs_free_client()\n");
198 }
199
200 /*
201 * Release a reference to a shared client record
202 */
203 void nfs_put_client(struct nfs_client *clp)
204 {
205 if (!clp)
206 return;
207
208 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
209
210 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
211 list_del(&clp->cl_share_link);
212 spin_unlock(&nfs_client_lock);
213
214 BUG_ON(!list_empty(&clp->cl_superblocks));
215
216 nfs_free_client(clp);
217 }
218 }
219
220 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
221 const struct sockaddr_in *sa2)
222 {
223 return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
224 }
225
226 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr_in6 *sa1,
227 const struct sockaddr_in6 *sa2)
228 {
229 return ipv6_addr_equal(&sa1->sin6_addr, &sa2->sin6_addr);
230 }
231
232 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
233 const struct sockaddr *sa2)
234 {
235 switch (sa1->sa_family) {
236 case AF_INET:
237 return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
238 (const struct sockaddr_in *)sa2);
239 case AF_INET6:
240 return nfs_sockaddr_match_ipaddr6((const struct sockaddr_in6 *)sa1,
241 (const struct sockaddr_in6 *)sa2);
242 }
243 BUG();
244 }
245
246 /*
247 * Find a client by IP address and protocol version
248 * - returns NULL if no such client
249 */
250 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
251 {
252 struct nfs_client *clp;
253
254 spin_lock(&nfs_client_lock);
255 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
256 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
257
258 /* Don't match clients that failed to initialise properly */
259 if (clp->cl_cons_state != NFS_CS_READY)
260 continue;
261
262 /* Different NFS versions cannot share the same nfs_client */
263 if (clp->rpc_ops->version != nfsversion)
264 continue;
265
266 if (addr->sa_family != clap->sa_family)
267 continue;
268 /* Match only the IP address, not the port number */
269 if (!nfs_sockaddr_match_ipaddr(addr, clap))
270 continue;
271
272 atomic_inc(&clp->cl_count);
273 spin_unlock(&nfs_client_lock);
274 return clp;
275 }
276 spin_unlock(&nfs_client_lock);
277 return NULL;
278 }
279
280 /*
281 * Find a client by IP address and protocol version
282 * - returns NULL if no such client
283 */
284 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
285 {
286 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
287 u32 nfsvers = clp->rpc_ops->version;
288
289 spin_lock(&nfs_client_lock);
290 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
291 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
292
293 /* Don't match clients that failed to initialise properly */
294 if (clp->cl_cons_state != NFS_CS_READY)
295 continue;
296
297 /* Different NFS versions cannot share the same nfs_client */
298 if (clp->rpc_ops->version != nfsvers)
299 continue;
300
301 if (sap->sa_family != clap->sa_family)
302 continue;
303 /* Match only the IP address, not the port number */
304 if (!nfs_sockaddr_match_ipaddr(sap, clap))
305 continue;
306
307 atomic_inc(&clp->cl_count);
308 spin_unlock(&nfs_client_lock);
309 return clp;
310 }
311 spin_unlock(&nfs_client_lock);
312 return NULL;
313 }
314
315 /*
316 * Find an nfs_client on the list that matches the initialisation data
317 * that is supplied.
318 */
319 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
320 {
321 struct nfs_client *clp;
322
323 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
324 /* Don't match clients that failed to initialise properly */
325 if (clp->cl_cons_state < 0)
326 continue;
327
328 /* Different NFS versions cannot share the same nfs_client */
329 if (clp->rpc_ops != data->rpc_ops)
330 continue;
331
332 if (clp->cl_proto != data->proto)
333 continue;
334
335 /* Match the full socket address */
336 if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
337 continue;
338
339 atomic_inc(&clp->cl_count);
340 return clp;
341 }
342 return NULL;
343 }
344
345 /*
346 * Look up a client by IP address and protocol version
347 * - creates a new record if one doesn't yet exist
348 */
349 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
350 {
351 struct nfs_client *clp, *new = NULL;
352 int error;
353
354 dprintk("--> nfs_get_client(%s,v%u)\n",
355 cl_init->hostname ?: "", cl_init->rpc_ops->version);
356
357 /* see if the client already exists */
358 do {
359 spin_lock(&nfs_client_lock);
360
361 clp = nfs_match_client(cl_init);
362 if (clp)
363 goto found_client;
364 if (new)
365 goto install_client;
366
367 spin_unlock(&nfs_client_lock);
368
369 new = nfs_alloc_client(cl_init);
370 } while (new);
371
372 return ERR_PTR(-ENOMEM);
373
374 /* install a new client and return with it unready */
375 install_client:
376 clp = new;
377 list_add(&clp->cl_share_link, &nfs_client_list);
378 spin_unlock(&nfs_client_lock);
379 dprintk("--> nfs_get_client() = %p [new]\n", clp);
380 return clp;
381
382 /* found an existing client
383 * - make sure it's ready before returning
384 */
385 found_client:
386 spin_unlock(&nfs_client_lock);
387
388 if (new)
389 nfs_free_client(new);
390
391 error = wait_event_killable(nfs_client_active_wq,
392 clp->cl_cons_state != NFS_CS_INITING);
393 if (error < 0) {
394 nfs_put_client(clp);
395 return ERR_PTR(-ERESTARTSYS);
396 }
397
398 if (clp->cl_cons_state < NFS_CS_READY) {
399 error = clp->cl_cons_state;
400 nfs_put_client(clp);
401 return ERR_PTR(error);
402 }
403
404 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
405
406 dprintk("--> nfs_get_client() = %p [share]\n", clp);
407 return clp;
408 }
409
410 /*
411 * Mark a server as ready or failed
412 */
413 static void nfs_mark_client_ready(struct nfs_client *clp, int state)
414 {
415 clp->cl_cons_state = state;
416 wake_up_all(&nfs_client_active_wq);
417 }
418
419 /*
420 * Initialise the timeout values for a connection
421 */
422 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
423 unsigned int timeo, unsigned int retrans)
424 {
425 to->to_initval = timeo * HZ / 10;
426 to->to_retries = retrans;
427 if (!to->to_retries)
428 to->to_retries = 2;
429
430 switch (proto) {
431 case XPRT_TRANSPORT_TCP:
432 case XPRT_TRANSPORT_RDMA:
433 if (to->to_initval == 0)
434 to->to_initval = 60 * HZ;
435 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
436 to->to_initval = NFS_MAX_TCP_TIMEOUT;
437 to->to_increment = to->to_initval;
438 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
439 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
440 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
441 if (to->to_maxval < to->to_initval)
442 to->to_maxval = to->to_initval;
443 to->to_exponential = 0;
444 break;
445 case XPRT_TRANSPORT_UDP:
446 default:
447 if (!to->to_initval)
448 to->to_initval = 11 * HZ / 10;
449 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
450 to->to_initval = NFS_MAX_UDP_TIMEOUT;
451 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
452 to->to_exponential = 1;
453 break;
454 }
455 }
456
457 /*
458 * Create an RPC client handle
459 */
460 static int nfs_create_rpc_client(struct nfs_client *clp,
461 const struct rpc_timeout *timeparms,
462 rpc_authflavor_t flavor,
463 int flags)
464 {
465 struct rpc_clnt *clnt = NULL;
466 struct rpc_create_args args = {
467 .protocol = clp->cl_proto,
468 .address = (struct sockaddr *)&clp->cl_addr,
469 .addrsize = clp->cl_addrlen,
470 .timeout = timeparms,
471 .servername = clp->cl_hostname,
472 .program = &nfs_program,
473 .version = clp->rpc_ops->version,
474 .authflavor = flavor,
475 .flags = flags,
476 };
477
478 if (!IS_ERR(clp->cl_rpcclient))
479 return 0;
480
481 clnt = rpc_create(&args);
482 if (IS_ERR(clnt)) {
483 dprintk("%s: cannot create RPC client. Error = %ld\n",
484 __FUNCTION__, PTR_ERR(clnt));
485 return PTR_ERR(clnt);
486 }
487
488 clp->cl_rpcclient = clnt;
489 return 0;
490 }
491
492 /*
493 * Version 2 or 3 client destruction
494 */
495 static void nfs_destroy_server(struct nfs_server *server)
496 {
497 if (!(server->flags & NFS_MOUNT_NONLM))
498 nlmclnt_done(server->nlm_host);
499 }
500
501 /*
502 * Version 2 or 3 lockd setup
503 */
504 static int nfs_start_lockd(struct nfs_server *server)
505 {
506 struct nlm_host *host;
507 struct nfs_client *clp = server->nfs_client;
508 struct nlmclnt_initdata nlm_init = {
509 .hostname = clp->cl_hostname,
510 .address = (struct sockaddr *)&clp->cl_addr,
511 .addrlen = clp->cl_addrlen,
512 .protocol = server->flags & NFS_MOUNT_TCP ?
513 IPPROTO_TCP : IPPROTO_UDP,
514 .nfs_version = clp->rpc_ops->version,
515 };
516
517 if (nlm_init.nfs_version > 3)
518 return 0;
519 if (server->flags & NFS_MOUNT_NONLM)
520 return 0;
521
522 host = nlmclnt_init(&nlm_init);
523 if (IS_ERR(host))
524 return PTR_ERR(host);
525
526 server->nlm_host = host;
527 server->destroy = nfs_destroy_server;
528 return 0;
529 }
530
531 /*
532 * Initialise an NFSv3 ACL client connection
533 */
534 #ifdef CONFIG_NFS_V3_ACL
535 static void nfs_init_server_aclclient(struct nfs_server *server)
536 {
537 if (server->nfs_client->rpc_ops->version != 3)
538 goto out_noacl;
539 if (server->flags & NFS_MOUNT_NOACL)
540 goto out_noacl;
541
542 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
543 if (IS_ERR(server->client_acl))
544 goto out_noacl;
545
546 /* No errors! Assume that Sun nfsacls are supported */
547 server->caps |= NFS_CAP_ACLS;
548 return;
549
550 out_noacl:
551 server->caps &= ~NFS_CAP_ACLS;
552 }
553 #else
554 static inline void nfs_init_server_aclclient(struct nfs_server *server)
555 {
556 server->flags &= ~NFS_MOUNT_NOACL;
557 server->caps &= ~NFS_CAP_ACLS;
558 }
559 #endif
560
561 /*
562 * Create a general RPC client
563 */
564 static int nfs_init_server_rpcclient(struct nfs_server *server,
565 const struct rpc_timeout *timeo,
566 rpc_authflavor_t pseudoflavour)
567 {
568 struct nfs_client *clp = server->nfs_client;
569
570 server->client = rpc_clone_client(clp->cl_rpcclient);
571 if (IS_ERR(server->client)) {
572 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
573 return PTR_ERR(server->client);
574 }
575
576 memcpy(&server->client->cl_timeout_default,
577 timeo,
578 sizeof(server->client->cl_timeout_default));
579 server->client->cl_timeout = &server->client->cl_timeout_default;
580
581 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
582 struct rpc_auth *auth;
583
584 auth = rpcauth_create(pseudoflavour, server->client);
585 if (IS_ERR(auth)) {
586 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
587 return PTR_ERR(auth);
588 }
589 }
590 server->client->cl_softrtry = 0;
591 if (server->flags & NFS_MOUNT_SOFT)
592 server->client->cl_softrtry = 1;
593
594 return 0;
595 }
596
597 /*
598 * Initialise an NFS2 or NFS3 client
599 */
600 static int nfs_init_client(struct nfs_client *clp,
601 const struct rpc_timeout *timeparms,
602 const struct nfs_parsed_mount_data *data)
603 {
604 int error;
605
606 if (clp->cl_cons_state == NFS_CS_READY) {
607 /* the client is already initialised */
608 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
609 return 0;
610 }
611
612 /*
613 * Create a client RPC handle for doing FSSTAT with UNIX auth only
614 * - RFC 2623, sec 2.3.2
615 */
616 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 0);
617 if (error < 0)
618 goto error;
619 nfs_mark_client_ready(clp, NFS_CS_READY);
620 return 0;
621
622 error:
623 nfs_mark_client_ready(clp, error);
624 dprintk("<-- nfs_init_client() = xerror %d\n", error);
625 return error;
626 }
627
628 /*
629 * Create a version 2 or 3 client
630 */
631 static int nfs_init_server(struct nfs_server *server,
632 const struct nfs_parsed_mount_data *data)
633 {
634 struct nfs_client_initdata cl_init = {
635 .hostname = data->nfs_server.hostname,
636 .addr = (const struct sockaddr *)&data->nfs_server.address,
637 .addrlen = data->nfs_server.addrlen,
638 .rpc_ops = &nfs_v2_clientops,
639 .proto = data->nfs_server.protocol,
640 };
641 struct rpc_timeout timeparms;
642 struct nfs_client *clp;
643 int error;
644
645 dprintk("--> nfs_init_server()\n");
646
647 #ifdef CONFIG_NFS_V3
648 if (data->flags & NFS_MOUNT_VER3)
649 cl_init.rpc_ops = &nfs_v3_clientops;
650 #endif
651
652 /* Allocate or find a client reference we can use */
653 clp = nfs_get_client(&cl_init);
654 if (IS_ERR(clp)) {
655 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
656 return PTR_ERR(clp);
657 }
658
659 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
660 data->timeo, data->retrans);
661 error = nfs_init_client(clp, &timeparms, data);
662 if (error < 0)
663 goto error;
664
665 server->nfs_client = clp;
666
667 /* Initialise the client representation from the mount data */
668 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
669
670 if (data->rsize)
671 server->rsize = nfs_block_size(data->rsize, NULL);
672 if (data->wsize)
673 server->wsize = nfs_block_size(data->wsize, NULL);
674
675 server->acregmin = data->acregmin * HZ;
676 server->acregmax = data->acregmax * HZ;
677 server->acdirmin = data->acdirmin * HZ;
678 server->acdirmax = data->acdirmax * HZ;
679
680 /* Start lockd here, before we might error out */
681 error = nfs_start_lockd(server);
682 if (error < 0)
683 goto error;
684
685 server->port = data->nfs_server.port;
686
687 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
688 if (error < 0)
689 goto error;
690
691 server->namelen = data->namlen;
692 /* Create a client RPC handle for the NFSv3 ACL management interface */
693 nfs_init_server_aclclient(server);
694 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
695 return 0;
696
697 error:
698 server->nfs_client = NULL;
699 nfs_put_client(clp);
700 dprintk("<-- nfs_init_server() = xerror %d\n", error);
701 return error;
702 }
703
704 /*
705 * Load up the server record from information gained in an fsinfo record
706 */
707 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
708 {
709 unsigned long max_rpc_payload;
710
711 /* Work out a lot of parameters */
712 if (server->rsize == 0)
713 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
714 if (server->wsize == 0)
715 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
716
717 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
718 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
719 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
720 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
721
722 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
723 if (server->rsize > max_rpc_payload)
724 server->rsize = max_rpc_payload;
725 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
726 server->rsize = NFS_MAX_FILE_IO_SIZE;
727 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
728
729 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
730
731 if (server->wsize > max_rpc_payload)
732 server->wsize = max_rpc_payload;
733 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
734 server->wsize = NFS_MAX_FILE_IO_SIZE;
735 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
736 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
737
738 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
739 if (server->dtsize > PAGE_CACHE_SIZE)
740 server->dtsize = PAGE_CACHE_SIZE;
741 if (server->dtsize > server->rsize)
742 server->dtsize = server->rsize;
743
744 if (server->flags & NFS_MOUNT_NOAC) {
745 server->acregmin = server->acregmax = 0;
746 server->acdirmin = server->acdirmax = 0;
747 }
748
749 server->maxfilesize = fsinfo->maxfilesize;
750
751 /* We're airborne Set socket buffersize */
752 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
753 }
754
755 /*
756 * Probe filesystem information, including the FSID on v2/v3
757 */
758 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
759 {
760 struct nfs_fsinfo fsinfo;
761 struct nfs_client *clp = server->nfs_client;
762 int error;
763
764 dprintk("--> nfs_probe_fsinfo()\n");
765
766 if (clp->rpc_ops->set_capabilities != NULL) {
767 error = clp->rpc_ops->set_capabilities(server, mntfh);
768 if (error < 0)
769 goto out_error;
770 }
771
772 fsinfo.fattr = fattr;
773 nfs_fattr_init(fattr);
774 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
775 if (error < 0)
776 goto out_error;
777
778 nfs_server_set_fsinfo(server, &fsinfo);
779 error = bdi_init(&server->backing_dev_info);
780 if (error)
781 goto out_error;
782
783
784 /* Get some general file system info */
785 if (server->namelen == 0) {
786 struct nfs_pathconf pathinfo;
787
788 pathinfo.fattr = fattr;
789 nfs_fattr_init(fattr);
790
791 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
792 server->namelen = pathinfo.max_namelen;
793 }
794
795 dprintk("<-- nfs_probe_fsinfo() = 0\n");
796 return 0;
797
798 out_error:
799 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
800 return error;
801 }
802
803 /*
804 * Copy useful information when duplicating a server record
805 */
806 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
807 {
808 target->flags = source->flags;
809 target->acregmin = source->acregmin;
810 target->acregmax = source->acregmax;
811 target->acdirmin = source->acdirmin;
812 target->acdirmax = source->acdirmax;
813 target->caps = source->caps;
814 }
815
816 /*
817 * Allocate and initialise a server record
818 */
819 static struct nfs_server *nfs_alloc_server(void)
820 {
821 struct nfs_server *server;
822
823 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
824 if (!server)
825 return NULL;
826
827 server->client = server->client_acl = ERR_PTR(-EINVAL);
828
829 /* Zero out the NFS state stuff */
830 INIT_LIST_HEAD(&server->client_link);
831 INIT_LIST_HEAD(&server->master_link);
832
833 init_waitqueue_head(&server->active_wq);
834 atomic_set(&server->active, 0);
835
836 server->io_stats = nfs_alloc_iostats();
837 if (!server->io_stats) {
838 kfree(server);
839 return NULL;
840 }
841
842 return server;
843 }
844
845 /*
846 * Free up a server record
847 */
848 void nfs_free_server(struct nfs_server *server)
849 {
850 dprintk("--> nfs_free_server()\n");
851
852 spin_lock(&nfs_client_lock);
853 list_del(&server->client_link);
854 list_del(&server->master_link);
855 spin_unlock(&nfs_client_lock);
856
857 if (server->destroy != NULL)
858 server->destroy(server);
859
860 if (!IS_ERR(server->client_acl))
861 rpc_shutdown_client(server->client_acl);
862 if (!IS_ERR(server->client))
863 rpc_shutdown_client(server->client);
864
865 nfs_put_client(server->nfs_client);
866
867 nfs_free_iostats(server->io_stats);
868 bdi_destroy(&server->backing_dev_info);
869 kfree(server);
870 nfs_release_automount_timer();
871 dprintk("<-- nfs_free_server()\n");
872 }
873
874 /*
875 * Create a version 2 or 3 volume record
876 * - keyed on server and FSID
877 */
878 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
879 struct nfs_fh *mntfh)
880 {
881 struct nfs_server *server;
882 struct nfs_fattr fattr;
883 int error;
884
885 server = nfs_alloc_server();
886 if (!server)
887 return ERR_PTR(-ENOMEM);
888
889 /* Get a client representation */
890 error = nfs_init_server(server, data);
891 if (error < 0)
892 goto error;
893
894 BUG_ON(!server->nfs_client);
895 BUG_ON(!server->nfs_client->rpc_ops);
896 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
897
898 /* Probe the root fh to retrieve its FSID */
899 error = nfs_probe_fsinfo(server, mntfh, &fattr);
900 if (error < 0)
901 goto error;
902 if (server->nfs_client->rpc_ops->version == 3) {
903 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
904 server->namelen = NFS3_MAXNAMLEN;
905 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
906 server->caps |= NFS_CAP_READDIRPLUS;
907 } else {
908 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
909 server->namelen = NFS2_MAXNAMLEN;
910 }
911
912 if (!(fattr.valid & NFS_ATTR_FATTR)) {
913 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
914 if (error < 0) {
915 dprintk("nfs_create_server: getattr error = %d\n", -error);
916 goto error;
917 }
918 }
919 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
920
921 dprintk("Server FSID: %llx:%llx\n",
922 (unsigned long long) server->fsid.major,
923 (unsigned long long) server->fsid.minor);
924
925 BUG_ON(!server->nfs_client);
926 BUG_ON(!server->nfs_client->rpc_ops);
927 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
928
929 spin_lock(&nfs_client_lock);
930 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
931 list_add_tail(&server->master_link, &nfs_volume_list);
932 spin_unlock(&nfs_client_lock);
933
934 server->mount_time = jiffies;
935 return server;
936
937 error:
938 nfs_free_server(server);
939 return ERR_PTR(error);
940 }
941
942 #ifdef CONFIG_NFS_V4
943 /*
944 * Initialise an NFS4 client record
945 */
946 static int nfs4_init_client(struct nfs_client *clp,
947 const struct rpc_timeout *timeparms,
948 const char *ip_addr,
949 rpc_authflavor_t authflavour)
950 {
951 int error;
952
953 if (clp->cl_cons_state == NFS_CS_READY) {
954 /* the client is initialised already */
955 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
956 return 0;
957 }
958
959 /* Check NFS protocol revision and initialize RPC op vector */
960 clp->rpc_ops = &nfs_v4_clientops;
961
962 error = nfs_create_rpc_client(clp, timeparms, authflavour,
963 RPC_CLNT_CREATE_DISCRTRY);
964 if (error < 0)
965 goto error;
966 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
967
968 error = nfs_idmap_new(clp);
969 if (error < 0) {
970 dprintk("%s: failed to create idmapper. Error = %d\n",
971 __FUNCTION__, error);
972 goto error;
973 }
974 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
975
976 nfs_mark_client_ready(clp, NFS_CS_READY);
977 return 0;
978
979 error:
980 nfs_mark_client_ready(clp, error);
981 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
982 return error;
983 }
984
985 /*
986 * Set up an NFS4 client
987 */
988 static int nfs4_set_client(struct nfs_server *server,
989 const char *hostname,
990 const struct sockaddr *addr,
991 const size_t addrlen,
992 const char *ip_addr,
993 rpc_authflavor_t authflavour,
994 int proto, const struct rpc_timeout *timeparms)
995 {
996 struct nfs_client_initdata cl_init = {
997 .hostname = hostname,
998 .addr = addr,
999 .addrlen = addrlen,
1000 .rpc_ops = &nfs_v4_clientops,
1001 .proto = proto,
1002 };
1003 struct nfs_client *clp;
1004 int error;
1005
1006 dprintk("--> nfs4_set_client()\n");
1007
1008 /* Allocate or find a client reference we can use */
1009 clp = nfs_get_client(&cl_init);
1010 if (IS_ERR(clp)) {
1011 error = PTR_ERR(clp);
1012 goto error;
1013 }
1014 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour);
1015 if (error < 0)
1016 goto error_put;
1017
1018 server->nfs_client = clp;
1019 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1020 return 0;
1021
1022 error_put:
1023 nfs_put_client(clp);
1024 error:
1025 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1026 return error;
1027 }
1028
1029 /*
1030 * Create a version 4 volume record
1031 */
1032 static int nfs4_init_server(struct nfs_server *server,
1033 const struct nfs_parsed_mount_data *data)
1034 {
1035 struct rpc_timeout timeparms;
1036 int error;
1037
1038 dprintk("--> nfs4_init_server()\n");
1039
1040 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1041 data->timeo, data->retrans);
1042
1043 /* Get a client record */
1044 error = nfs4_set_client(server,
1045 data->nfs_server.hostname,
1046 (const struct sockaddr *)&data->nfs_server.address,
1047 data->nfs_server.addrlen,
1048 data->client_address,
1049 data->auth_flavors[0],
1050 data->nfs_server.protocol,
1051 &timeparms);
1052 if (error < 0)
1053 goto error;
1054
1055 /* Initialise the client representation from the mount data */
1056 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1057 server->caps |= NFS_CAP_ATOMIC_OPEN;
1058
1059 if (data->rsize)
1060 server->rsize = nfs_block_size(data->rsize, NULL);
1061 if (data->wsize)
1062 server->wsize = nfs_block_size(data->wsize, NULL);
1063
1064 server->acregmin = data->acregmin * HZ;
1065 server->acregmax = data->acregmax * HZ;
1066 server->acdirmin = data->acdirmin * HZ;
1067 server->acdirmax = data->acdirmax * HZ;
1068
1069 server->port = data->nfs_server.port;
1070
1071 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1072
1073 error:
1074 /* Done */
1075 dprintk("<-- nfs4_init_server() = %d\n", error);
1076 return error;
1077 }
1078
1079 /*
1080 * Create a version 4 volume record
1081 * - keyed on server and FSID
1082 */
1083 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1084 struct nfs_fh *mntfh)
1085 {
1086 struct nfs_fattr fattr;
1087 struct nfs_server *server;
1088 int error;
1089
1090 dprintk("--> nfs4_create_server()\n");
1091
1092 server = nfs_alloc_server();
1093 if (!server)
1094 return ERR_PTR(-ENOMEM);
1095
1096 /* set up the general RPC client */
1097 error = nfs4_init_server(server, data);
1098 if (error < 0)
1099 goto error;
1100
1101 BUG_ON(!server->nfs_client);
1102 BUG_ON(!server->nfs_client->rpc_ops);
1103 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1104
1105 /* Probe the root fh to retrieve its FSID */
1106 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1107 if (error < 0)
1108 goto error;
1109
1110 dprintk("Server FSID: %llx:%llx\n",
1111 (unsigned long long) server->fsid.major,
1112 (unsigned long long) server->fsid.minor);
1113 dprintk("Mount FH: %d\n", mntfh->size);
1114
1115 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1116 if (error < 0)
1117 goto error;
1118
1119 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1120 server->namelen = NFS4_MAXNAMLEN;
1121
1122 BUG_ON(!server->nfs_client);
1123 BUG_ON(!server->nfs_client->rpc_ops);
1124 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1125
1126 spin_lock(&nfs_client_lock);
1127 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1128 list_add_tail(&server->master_link, &nfs_volume_list);
1129 spin_unlock(&nfs_client_lock);
1130
1131 server->mount_time = jiffies;
1132 dprintk("<-- nfs4_create_server() = %p\n", server);
1133 return server;
1134
1135 error:
1136 nfs_free_server(server);
1137 dprintk("<-- nfs4_create_server() = error %d\n", error);
1138 return ERR_PTR(error);
1139 }
1140
1141 /*
1142 * Create an NFS4 referral server record
1143 */
1144 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1145 struct nfs_fh *mntfh)
1146 {
1147 struct nfs_client *parent_client;
1148 struct nfs_server *server, *parent_server;
1149 struct nfs_fattr fattr;
1150 int error;
1151
1152 dprintk("--> nfs4_create_referral_server()\n");
1153
1154 server = nfs_alloc_server();
1155 if (!server)
1156 return ERR_PTR(-ENOMEM);
1157
1158 parent_server = NFS_SB(data->sb);
1159 parent_client = parent_server->nfs_client;
1160
1161 /* Get a client representation.
1162 * Note: NFSv4 always uses TCP, */
1163 error = nfs4_set_client(server, data->hostname,
1164 data->addr,
1165 data->addrlen,
1166 parent_client->cl_ipaddr,
1167 data->authflavor,
1168 parent_server->client->cl_xprt->prot,
1169 parent_server->client->cl_timeout);
1170 if (error < 0)
1171 goto error;
1172
1173 /* Initialise the client representation from the parent server */
1174 nfs_server_copy_userdata(server, parent_server);
1175 server->caps |= NFS_CAP_ATOMIC_OPEN;
1176
1177 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1178 if (error < 0)
1179 goto error;
1180
1181 BUG_ON(!server->nfs_client);
1182 BUG_ON(!server->nfs_client->rpc_ops);
1183 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1184
1185 /* Probe the root fh to retrieve its FSID and filehandle */
1186 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1187 if (error < 0)
1188 goto error;
1189
1190 /* probe the filesystem info for this server filesystem */
1191 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1192 if (error < 0)
1193 goto error;
1194
1195 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1196 server->namelen = NFS4_MAXNAMLEN;
1197
1198 dprintk("Referral FSID: %llx:%llx\n",
1199 (unsigned long long) server->fsid.major,
1200 (unsigned long long) server->fsid.minor);
1201
1202 spin_lock(&nfs_client_lock);
1203 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1204 list_add_tail(&server->master_link, &nfs_volume_list);
1205 spin_unlock(&nfs_client_lock);
1206
1207 server->mount_time = jiffies;
1208
1209 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1210 return server;
1211
1212 error:
1213 nfs_free_server(server);
1214 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1215 return ERR_PTR(error);
1216 }
1217
1218 #endif /* CONFIG_NFS_V4 */
1219
1220 /*
1221 * Clone an NFS2, NFS3 or NFS4 server record
1222 */
1223 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1224 struct nfs_fh *fh,
1225 struct nfs_fattr *fattr)
1226 {
1227 struct nfs_server *server;
1228 struct nfs_fattr fattr_fsinfo;
1229 int error;
1230
1231 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1232 (unsigned long long) fattr->fsid.major,
1233 (unsigned long long) fattr->fsid.minor);
1234
1235 server = nfs_alloc_server();
1236 if (!server)
1237 return ERR_PTR(-ENOMEM);
1238
1239 /* Copy data from the source */
1240 server->nfs_client = source->nfs_client;
1241 atomic_inc(&server->nfs_client->cl_count);
1242 nfs_server_copy_userdata(server, source);
1243
1244 server->fsid = fattr->fsid;
1245
1246 error = nfs_init_server_rpcclient(server,
1247 source->client->cl_timeout,
1248 source->client->cl_auth->au_flavor);
1249 if (error < 0)
1250 goto out_free_server;
1251 if (!IS_ERR(source->client_acl))
1252 nfs_init_server_aclclient(server);
1253
1254 /* probe the filesystem info for this server filesystem */
1255 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1256 if (error < 0)
1257 goto out_free_server;
1258
1259 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1260 server->namelen = NFS4_MAXNAMLEN;
1261
1262 dprintk("Cloned FSID: %llx:%llx\n",
1263 (unsigned long long) server->fsid.major,
1264 (unsigned long long) server->fsid.minor);
1265
1266 error = nfs_start_lockd(server);
1267 if (error < 0)
1268 goto out_free_server;
1269
1270 spin_lock(&nfs_client_lock);
1271 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1272 list_add_tail(&server->master_link, &nfs_volume_list);
1273 spin_unlock(&nfs_client_lock);
1274
1275 server->mount_time = jiffies;
1276
1277 dprintk("<-- nfs_clone_server() = %p\n", server);
1278 return server;
1279
1280 out_free_server:
1281 nfs_free_server(server);
1282 dprintk("<-- nfs_clone_server() = error %d\n", error);
1283 return ERR_PTR(error);
1284 }
1285
1286 #ifdef CONFIG_PROC_FS
1287 static struct proc_dir_entry *proc_fs_nfs;
1288
1289 static int nfs_server_list_open(struct inode *inode, struct file *file);
1290 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1291 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1292 static void nfs_server_list_stop(struct seq_file *p, void *v);
1293 static int nfs_server_list_show(struct seq_file *m, void *v);
1294
1295 static struct seq_operations nfs_server_list_ops = {
1296 .start = nfs_server_list_start,
1297 .next = nfs_server_list_next,
1298 .stop = nfs_server_list_stop,
1299 .show = nfs_server_list_show,
1300 };
1301
1302 static const struct file_operations nfs_server_list_fops = {
1303 .open = nfs_server_list_open,
1304 .read = seq_read,
1305 .llseek = seq_lseek,
1306 .release = seq_release,
1307 };
1308
1309 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1310 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1311 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1312 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1313 static int nfs_volume_list_show(struct seq_file *m, void *v);
1314
1315 static struct seq_operations nfs_volume_list_ops = {
1316 .start = nfs_volume_list_start,
1317 .next = nfs_volume_list_next,
1318 .stop = nfs_volume_list_stop,
1319 .show = nfs_volume_list_show,
1320 };
1321
1322 static const struct file_operations nfs_volume_list_fops = {
1323 .open = nfs_volume_list_open,
1324 .read = seq_read,
1325 .llseek = seq_lseek,
1326 .release = seq_release,
1327 };
1328
1329 /*
1330 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1331 * we're dealing
1332 */
1333 static int nfs_server_list_open(struct inode *inode, struct file *file)
1334 {
1335 struct seq_file *m;
1336 int ret;
1337
1338 ret = seq_open(file, &nfs_server_list_ops);
1339 if (ret < 0)
1340 return ret;
1341
1342 m = file->private_data;
1343 m->private = PDE(inode)->data;
1344
1345 return 0;
1346 }
1347
1348 /*
1349 * set up the iterator to start reading from the server list and return the first item
1350 */
1351 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1352 {
1353 /* lock the list against modification */
1354 spin_lock(&nfs_client_lock);
1355 return seq_list_start_head(&nfs_client_list, *_pos);
1356 }
1357
1358 /*
1359 * move to next server
1360 */
1361 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1362 {
1363 return seq_list_next(v, &nfs_client_list, pos);
1364 }
1365
1366 /*
1367 * clean up after reading from the transports list
1368 */
1369 static void nfs_server_list_stop(struct seq_file *p, void *v)
1370 {
1371 spin_unlock(&nfs_client_lock);
1372 }
1373
1374 /*
1375 * display a header line followed by a load of call lines
1376 */
1377 static int nfs_server_list_show(struct seq_file *m, void *v)
1378 {
1379 struct nfs_client *clp;
1380
1381 /* display header on line 1 */
1382 if (v == &nfs_client_list) {
1383 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1384 return 0;
1385 }
1386
1387 /* display one transport per line on subsequent lines */
1388 clp = list_entry(v, struct nfs_client, cl_share_link);
1389
1390 seq_printf(m, "v%u %s %s %3d %s\n",
1391 clp->rpc_ops->version,
1392 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1393 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1394 atomic_read(&clp->cl_count),
1395 clp->cl_hostname);
1396
1397 return 0;
1398 }
1399
1400 /*
1401 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1402 */
1403 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1404 {
1405 struct seq_file *m;
1406 int ret;
1407
1408 ret = seq_open(file, &nfs_volume_list_ops);
1409 if (ret < 0)
1410 return ret;
1411
1412 m = file->private_data;
1413 m->private = PDE(inode)->data;
1414
1415 return 0;
1416 }
1417
1418 /*
1419 * set up the iterator to start reading from the volume list and return the first item
1420 */
1421 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1422 {
1423 /* lock the list against modification */
1424 spin_lock(&nfs_client_lock);
1425 return seq_list_start_head(&nfs_volume_list, *_pos);
1426 }
1427
1428 /*
1429 * move to next volume
1430 */
1431 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1432 {
1433 return seq_list_next(v, &nfs_volume_list, pos);
1434 }
1435
1436 /*
1437 * clean up after reading from the transports list
1438 */
1439 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1440 {
1441 spin_unlock(&nfs_client_lock);
1442 }
1443
1444 /*
1445 * display a header line followed by a load of call lines
1446 */
1447 static int nfs_volume_list_show(struct seq_file *m, void *v)
1448 {
1449 struct nfs_server *server;
1450 struct nfs_client *clp;
1451 char dev[8], fsid[17];
1452
1453 /* display header on line 1 */
1454 if (v == &nfs_volume_list) {
1455 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1456 return 0;
1457 }
1458 /* display one transport per line on subsequent lines */
1459 server = list_entry(v, struct nfs_server, master_link);
1460 clp = server->nfs_client;
1461
1462 snprintf(dev, 8, "%u:%u",
1463 MAJOR(server->s_dev), MINOR(server->s_dev));
1464
1465 snprintf(fsid, 17, "%llx:%llx",
1466 (unsigned long long) server->fsid.major,
1467 (unsigned long long) server->fsid.minor);
1468
1469 seq_printf(m, "v%u %s %s %-7s %-17s\n",
1470 clp->rpc_ops->version,
1471 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1472 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1473 dev,
1474 fsid);
1475
1476 return 0;
1477 }
1478
1479 /*
1480 * initialise the /proc/fs/nfsfs/ directory
1481 */
1482 int __init nfs_fs_proc_init(void)
1483 {
1484 struct proc_dir_entry *p;
1485
1486 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
1487 if (!proc_fs_nfs)
1488 goto error_0;
1489
1490 proc_fs_nfs->owner = THIS_MODULE;
1491
1492 /* a file of servers with which we're dealing */
1493 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs);
1494 if (!p)
1495 goto error_1;
1496
1497 p->proc_fops = &nfs_server_list_fops;
1498 p->owner = THIS_MODULE;
1499
1500 /* a file of volumes that we have mounted */
1501 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
1502 if (!p)
1503 goto error_2;
1504
1505 p->proc_fops = &nfs_volume_list_fops;
1506 p->owner = THIS_MODULE;
1507 return 0;
1508
1509 error_2:
1510 remove_proc_entry("servers", proc_fs_nfs);
1511 error_1:
1512 remove_proc_entry("nfsfs", proc_root_fs);
1513 error_0:
1514 return -ENOMEM;
1515 }
1516
1517 /*
1518 * clean up the /proc/fs/nfsfs/ directory
1519 */
1520 void nfs_fs_proc_exit(void)
1521 {
1522 remove_proc_entry("volumes", proc_fs_nfs);
1523 remove_proc_entry("servers", proc_fs_nfs);
1524 remove_proc_entry("nfsfs", proc_root_fs);
1525 }
1526
1527 #endif /* CONFIG_PROC_FS */
Linux kernel - Deliverables
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