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NFS: Save the values of the "mount*=" mount options
[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 /* Preserve the values of mount_server-related mount options */
692 if (data->mount_server.addrlen) {
693 memcpy(&server->mountd_address, &data->mount_server.address,
694 data->mount_server.addrlen);
695 server->mountd_addrlen = data->mount_server.addrlen;
696 }
697 server->mountd_version = data->mount_server.version;
698 server->mountd_port = data->mount_server.port;
699 server->mountd_protocol = data->mount_server.protocol;
700
701 server->namelen = data->namlen;
702 /* Create a client RPC handle for the NFSv3 ACL management interface */
703 nfs_init_server_aclclient(server);
704 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
705 return 0;
706
707 error:
708 server->nfs_client = NULL;
709 nfs_put_client(clp);
710 dprintk("<-- nfs_init_server() = xerror %d\n", error);
711 return error;
712 }
713
714 /*
715 * Load up the server record from information gained in an fsinfo record
716 */
717 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
718 {
719 unsigned long max_rpc_payload;
720
721 /* Work out a lot of parameters */
722 if (server->rsize == 0)
723 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
724 if (server->wsize == 0)
725 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
726
727 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
728 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
729 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
730 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
731
732 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
733 if (server->rsize > max_rpc_payload)
734 server->rsize = max_rpc_payload;
735 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
736 server->rsize = NFS_MAX_FILE_IO_SIZE;
737 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
738
739 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
740
741 if (server->wsize > max_rpc_payload)
742 server->wsize = max_rpc_payload;
743 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
744 server->wsize = NFS_MAX_FILE_IO_SIZE;
745 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
746 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
747
748 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
749 if (server->dtsize > PAGE_CACHE_SIZE)
750 server->dtsize = PAGE_CACHE_SIZE;
751 if (server->dtsize > server->rsize)
752 server->dtsize = server->rsize;
753
754 if (server->flags & NFS_MOUNT_NOAC) {
755 server->acregmin = server->acregmax = 0;
756 server->acdirmin = server->acdirmax = 0;
757 }
758
759 server->maxfilesize = fsinfo->maxfilesize;
760
761 /* We're airborne Set socket buffersize */
762 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
763 }
764
765 /*
766 * Probe filesystem information, including the FSID on v2/v3
767 */
768 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
769 {
770 struct nfs_fsinfo fsinfo;
771 struct nfs_client *clp = server->nfs_client;
772 int error;
773
774 dprintk("--> nfs_probe_fsinfo()\n");
775
776 if (clp->rpc_ops->set_capabilities != NULL) {
777 error = clp->rpc_ops->set_capabilities(server, mntfh);
778 if (error < 0)
779 goto out_error;
780 }
781
782 fsinfo.fattr = fattr;
783 nfs_fattr_init(fattr);
784 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
785 if (error < 0)
786 goto out_error;
787
788 nfs_server_set_fsinfo(server, &fsinfo);
789 error = bdi_init(&server->backing_dev_info);
790 if (error)
791 goto out_error;
792
793
794 /* Get some general file system info */
795 if (server->namelen == 0) {
796 struct nfs_pathconf pathinfo;
797
798 pathinfo.fattr = fattr;
799 nfs_fattr_init(fattr);
800
801 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
802 server->namelen = pathinfo.max_namelen;
803 }
804
805 dprintk("<-- nfs_probe_fsinfo() = 0\n");
806 return 0;
807
808 out_error:
809 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
810 return error;
811 }
812
813 /*
814 * Copy useful information when duplicating a server record
815 */
816 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
817 {
818 target->flags = source->flags;
819 target->acregmin = source->acregmin;
820 target->acregmax = source->acregmax;
821 target->acdirmin = source->acdirmin;
822 target->acdirmax = source->acdirmax;
823 target->caps = source->caps;
824 }
825
826 /*
827 * Allocate and initialise a server record
828 */
829 static struct nfs_server *nfs_alloc_server(void)
830 {
831 struct nfs_server *server;
832
833 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
834 if (!server)
835 return NULL;
836
837 server->client = server->client_acl = ERR_PTR(-EINVAL);
838
839 /* Zero out the NFS state stuff */
840 INIT_LIST_HEAD(&server->client_link);
841 INIT_LIST_HEAD(&server->master_link);
842
843 init_waitqueue_head(&server->active_wq);
844 atomic_set(&server->active, 0);
845
846 server->io_stats = nfs_alloc_iostats();
847 if (!server->io_stats) {
848 kfree(server);
849 return NULL;
850 }
851
852 return server;
853 }
854
855 /*
856 * Free up a server record
857 */
858 void nfs_free_server(struct nfs_server *server)
859 {
860 dprintk("--> nfs_free_server()\n");
861
862 spin_lock(&nfs_client_lock);
863 list_del(&server->client_link);
864 list_del(&server->master_link);
865 spin_unlock(&nfs_client_lock);
866
867 if (server->destroy != NULL)
868 server->destroy(server);
869
870 if (!IS_ERR(server->client_acl))
871 rpc_shutdown_client(server->client_acl);
872 if (!IS_ERR(server->client))
873 rpc_shutdown_client(server->client);
874
875 nfs_put_client(server->nfs_client);
876
877 nfs_free_iostats(server->io_stats);
878 bdi_destroy(&server->backing_dev_info);
879 kfree(server);
880 nfs_release_automount_timer();
881 dprintk("<-- nfs_free_server()\n");
882 }
883
884 /*
885 * Create a version 2 or 3 volume record
886 * - keyed on server and FSID
887 */
888 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
889 struct nfs_fh *mntfh)
890 {
891 struct nfs_server *server;
892 struct nfs_fattr fattr;
893 int error;
894
895 server = nfs_alloc_server();
896 if (!server)
897 return ERR_PTR(-ENOMEM);
898
899 /* Get a client representation */
900 error = nfs_init_server(server, data);
901 if (error < 0)
902 goto error;
903
904 BUG_ON(!server->nfs_client);
905 BUG_ON(!server->nfs_client->rpc_ops);
906 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
907
908 /* Probe the root fh to retrieve its FSID */
909 error = nfs_probe_fsinfo(server, mntfh, &fattr);
910 if (error < 0)
911 goto error;
912 if (server->nfs_client->rpc_ops->version == 3) {
913 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
914 server->namelen = NFS3_MAXNAMLEN;
915 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
916 server->caps |= NFS_CAP_READDIRPLUS;
917 } else {
918 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
919 server->namelen = NFS2_MAXNAMLEN;
920 }
921
922 if (!(fattr.valid & NFS_ATTR_FATTR)) {
923 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
924 if (error < 0) {
925 dprintk("nfs_create_server: getattr error = %d\n", -error);
926 goto error;
927 }
928 }
929 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
930
931 dprintk("Server FSID: %llx:%llx\n",
932 (unsigned long long) server->fsid.major,
933 (unsigned long long) server->fsid.minor);
934
935 BUG_ON(!server->nfs_client);
936 BUG_ON(!server->nfs_client->rpc_ops);
937 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
938
939 spin_lock(&nfs_client_lock);
940 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
941 list_add_tail(&server->master_link, &nfs_volume_list);
942 spin_unlock(&nfs_client_lock);
943
944 server->mount_time = jiffies;
945 return server;
946
947 error:
948 nfs_free_server(server);
949 return ERR_PTR(error);
950 }
951
952 #ifdef CONFIG_NFS_V4
953 /*
954 * Initialise an NFS4 client record
955 */
956 static int nfs4_init_client(struct nfs_client *clp,
957 const struct rpc_timeout *timeparms,
958 const char *ip_addr,
959 rpc_authflavor_t authflavour)
960 {
961 int error;
962
963 if (clp->cl_cons_state == NFS_CS_READY) {
964 /* the client is initialised already */
965 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
966 return 0;
967 }
968
969 /* Check NFS protocol revision and initialize RPC op vector */
970 clp->rpc_ops = &nfs_v4_clientops;
971
972 error = nfs_create_rpc_client(clp, timeparms, authflavour,
973 RPC_CLNT_CREATE_DISCRTRY);
974 if (error < 0)
975 goto error;
976 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
977
978 error = nfs_idmap_new(clp);
979 if (error < 0) {
980 dprintk("%s: failed to create idmapper. Error = %d\n",
981 __FUNCTION__, error);
982 goto error;
983 }
984 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
985
986 nfs_mark_client_ready(clp, NFS_CS_READY);
987 return 0;
988
989 error:
990 nfs_mark_client_ready(clp, error);
991 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
992 return error;
993 }
994
995 /*
996 * Set up an NFS4 client
997 */
998 static int nfs4_set_client(struct nfs_server *server,
999 const char *hostname,
1000 const struct sockaddr *addr,
1001 const size_t addrlen,
1002 const char *ip_addr,
1003 rpc_authflavor_t authflavour,
1004 int proto, const struct rpc_timeout *timeparms)
1005 {
1006 struct nfs_client_initdata cl_init = {
1007 .hostname = hostname,
1008 .addr = addr,
1009 .addrlen = addrlen,
1010 .rpc_ops = &nfs_v4_clientops,
1011 .proto = proto,
1012 };
1013 struct nfs_client *clp;
1014 int error;
1015
1016 dprintk("--> nfs4_set_client()\n");
1017
1018 /* Allocate or find a client reference we can use */
1019 clp = nfs_get_client(&cl_init);
1020 if (IS_ERR(clp)) {
1021 error = PTR_ERR(clp);
1022 goto error;
1023 }
1024 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour);
1025 if (error < 0)
1026 goto error_put;
1027
1028 server->nfs_client = clp;
1029 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1030 return 0;
1031
1032 error_put:
1033 nfs_put_client(clp);
1034 error:
1035 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1036 return error;
1037 }
1038
1039 /*
1040 * Create a version 4 volume record
1041 */
1042 static int nfs4_init_server(struct nfs_server *server,
1043 const struct nfs_parsed_mount_data *data)
1044 {
1045 struct rpc_timeout timeparms;
1046 int error;
1047
1048 dprintk("--> nfs4_init_server()\n");
1049
1050 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1051 data->timeo, data->retrans);
1052
1053 /* Get a client record */
1054 error = nfs4_set_client(server,
1055 data->nfs_server.hostname,
1056 (const struct sockaddr *)&data->nfs_server.address,
1057 data->nfs_server.addrlen,
1058 data->client_address,
1059 data->auth_flavors[0],
1060 data->nfs_server.protocol,
1061 &timeparms);
1062 if (error < 0)
1063 goto error;
1064
1065 /* Initialise the client representation from the mount data */
1066 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1067 server->caps |= NFS_CAP_ATOMIC_OPEN;
1068
1069 if (data->rsize)
1070 server->rsize = nfs_block_size(data->rsize, NULL);
1071 if (data->wsize)
1072 server->wsize = nfs_block_size(data->wsize, NULL);
1073
1074 server->acregmin = data->acregmin * HZ;
1075 server->acregmax = data->acregmax * HZ;
1076 server->acdirmin = data->acdirmin * HZ;
1077 server->acdirmax = data->acdirmax * HZ;
1078
1079 server->port = data->nfs_server.port;
1080
1081 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1082
1083 error:
1084 /* Done */
1085 dprintk("<-- nfs4_init_server() = %d\n", error);
1086 return error;
1087 }
1088
1089 /*
1090 * Create a version 4 volume record
1091 * - keyed on server and FSID
1092 */
1093 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1094 struct nfs_fh *mntfh)
1095 {
1096 struct nfs_fattr fattr;
1097 struct nfs_server *server;
1098 int error;
1099
1100 dprintk("--> nfs4_create_server()\n");
1101
1102 server = nfs_alloc_server();
1103 if (!server)
1104 return ERR_PTR(-ENOMEM);
1105
1106 /* set up the general RPC client */
1107 error = nfs4_init_server(server, data);
1108 if (error < 0)
1109 goto error;
1110
1111 BUG_ON(!server->nfs_client);
1112 BUG_ON(!server->nfs_client->rpc_ops);
1113 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1114
1115 /* Probe the root fh to retrieve its FSID */
1116 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1117 if (error < 0)
1118 goto error;
1119
1120 dprintk("Server FSID: %llx:%llx\n",
1121 (unsigned long long) server->fsid.major,
1122 (unsigned long long) server->fsid.minor);
1123 dprintk("Mount FH: %d\n", mntfh->size);
1124
1125 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1126 if (error < 0)
1127 goto error;
1128
1129 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1130 server->namelen = NFS4_MAXNAMLEN;
1131
1132 BUG_ON(!server->nfs_client);
1133 BUG_ON(!server->nfs_client->rpc_ops);
1134 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1135
1136 spin_lock(&nfs_client_lock);
1137 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1138 list_add_tail(&server->master_link, &nfs_volume_list);
1139 spin_unlock(&nfs_client_lock);
1140
1141 server->mount_time = jiffies;
1142 dprintk("<-- nfs4_create_server() = %p\n", server);
1143 return server;
1144
1145 error:
1146 nfs_free_server(server);
1147 dprintk("<-- nfs4_create_server() = error %d\n", error);
1148 return ERR_PTR(error);
1149 }
1150
1151 /*
1152 * Create an NFS4 referral server record
1153 */
1154 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1155 struct nfs_fh *mntfh)
1156 {
1157 struct nfs_client *parent_client;
1158 struct nfs_server *server, *parent_server;
1159 struct nfs_fattr fattr;
1160 int error;
1161
1162 dprintk("--> nfs4_create_referral_server()\n");
1163
1164 server = nfs_alloc_server();
1165 if (!server)
1166 return ERR_PTR(-ENOMEM);
1167
1168 parent_server = NFS_SB(data->sb);
1169 parent_client = parent_server->nfs_client;
1170
1171 /* Get a client representation.
1172 * Note: NFSv4 always uses TCP, */
1173 error = nfs4_set_client(server, data->hostname,
1174 data->addr,
1175 data->addrlen,
1176 parent_client->cl_ipaddr,
1177 data->authflavor,
1178 parent_server->client->cl_xprt->prot,
1179 parent_server->client->cl_timeout);
1180 if (error < 0)
1181 goto error;
1182
1183 /* Initialise the client representation from the parent server */
1184 nfs_server_copy_userdata(server, parent_server);
1185 server->caps |= NFS_CAP_ATOMIC_OPEN;
1186
1187 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1188 if (error < 0)
1189 goto error;
1190
1191 BUG_ON(!server->nfs_client);
1192 BUG_ON(!server->nfs_client->rpc_ops);
1193 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1194
1195 /* Probe the root fh to retrieve its FSID and filehandle */
1196 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1197 if (error < 0)
1198 goto error;
1199
1200 /* probe the filesystem info for this server filesystem */
1201 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1202 if (error < 0)
1203 goto error;
1204
1205 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1206 server->namelen = NFS4_MAXNAMLEN;
1207
1208 dprintk("Referral FSID: %llx:%llx\n",
1209 (unsigned long long) server->fsid.major,
1210 (unsigned long long) server->fsid.minor);
1211
1212 spin_lock(&nfs_client_lock);
1213 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1214 list_add_tail(&server->master_link, &nfs_volume_list);
1215 spin_unlock(&nfs_client_lock);
1216
1217 server->mount_time = jiffies;
1218
1219 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1220 return server;
1221
1222 error:
1223 nfs_free_server(server);
1224 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1225 return ERR_PTR(error);
1226 }
1227
1228 #endif /* CONFIG_NFS_V4 */
1229
1230 /*
1231 * Clone an NFS2, NFS3 or NFS4 server record
1232 */
1233 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1234 struct nfs_fh *fh,
1235 struct nfs_fattr *fattr)
1236 {
1237 struct nfs_server *server;
1238 struct nfs_fattr fattr_fsinfo;
1239 int error;
1240
1241 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1242 (unsigned long long) fattr->fsid.major,
1243 (unsigned long long) fattr->fsid.minor);
1244
1245 server = nfs_alloc_server();
1246 if (!server)
1247 return ERR_PTR(-ENOMEM);
1248
1249 /* Copy data from the source */
1250 server->nfs_client = source->nfs_client;
1251 atomic_inc(&server->nfs_client->cl_count);
1252 nfs_server_copy_userdata(server, source);
1253
1254 server->fsid = fattr->fsid;
1255
1256 error = nfs_init_server_rpcclient(server,
1257 source->client->cl_timeout,
1258 source->client->cl_auth->au_flavor);
1259 if (error < 0)
1260 goto out_free_server;
1261 if (!IS_ERR(source->client_acl))
1262 nfs_init_server_aclclient(server);
1263
1264 /* probe the filesystem info for this server filesystem */
1265 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1266 if (error < 0)
1267 goto out_free_server;
1268
1269 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1270 server->namelen = NFS4_MAXNAMLEN;
1271
1272 dprintk("Cloned FSID: %llx:%llx\n",
1273 (unsigned long long) server->fsid.major,
1274 (unsigned long long) server->fsid.minor);
1275
1276 error = nfs_start_lockd(server);
1277 if (error < 0)
1278 goto out_free_server;
1279
1280 spin_lock(&nfs_client_lock);
1281 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1282 list_add_tail(&server->master_link, &nfs_volume_list);
1283 spin_unlock(&nfs_client_lock);
1284
1285 server->mount_time = jiffies;
1286
1287 dprintk("<-- nfs_clone_server() = %p\n", server);
1288 return server;
1289
1290 out_free_server:
1291 nfs_free_server(server);
1292 dprintk("<-- nfs_clone_server() = error %d\n", error);
1293 return ERR_PTR(error);
1294 }
1295
1296 #ifdef CONFIG_PROC_FS
1297 static struct proc_dir_entry *proc_fs_nfs;
1298
1299 static int nfs_server_list_open(struct inode *inode, struct file *file);
1300 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1301 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1302 static void nfs_server_list_stop(struct seq_file *p, void *v);
1303 static int nfs_server_list_show(struct seq_file *m, void *v);
1304
1305 static struct seq_operations nfs_server_list_ops = {
1306 .start = nfs_server_list_start,
1307 .next = nfs_server_list_next,
1308 .stop = nfs_server_list_stop,
1309 .show = nfs_server_list_show,
1310 };
1311
1312 static const struct file_operations nfs_server_list_fops = {
1313 .open = nfs_server_list_open,
1314 .read = seq_read,
1315 .llseek = seq_lseek,
1316 .release = seq_release,
1317 };
1318
1319 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1320 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1321 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1322 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1323 static int nfs_volume_list_show(struct seq_file *m, void *v);
1324
1325 static struct seq_operations nfs_volume_list_ops = {
1326 .start = nfs_volume_list_start,
1327 .next = nfs_volume_list_next,
1328 .stop = nfs_volume_list_stop,
1329 .show = nfs_volume_list_show,
1330 };
1331
1332 static const struct file_operations nfs_volume_list_fops = {
1333 .open = nfs_volume_list_open,
1334 .read = seq_read,
1335 .llseek = seq_lseek,
1336 .release = seq_release,
1337 };
1338
1339 /*
1340 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1341 * we're dealing
1342 */
1343 static int nfs_server_list_open(struct inode *inode, struct file *file)
1344 {
1345 struct seq_file *m;
1346 int ret;
1347
1348 ret = seq_open(file, &nfs_server_list_ops);
1349 if (ret < 0)
1350 return ret;
1351
1352 m = file->private_data;
1353 m->private = PDE(inode)->data;
1354
1355 return 0;
1356 }
1357
1358 /*
1359 * set up the iterator to start reading from the server list and return the first item
1360 */
1361 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1362 {
1363 /* lock the list against modification */
1364 spin_lock(&nfs_client_lock);
1365 return seq_list_start_head(&nfs_client_list, *_pos);
1366 }
1367
1368 /*
1369 * move to next server
1370 */
1371 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1372 {
1373 return seq_list_next(v, &nfs_client_list, pos);
1374 }
1375
1376 /*
1377 * clean up after reading from the transports list
1378 */
1379 static void nfs_server_list_stop(struct seq_file *p, void *v)
1380 {
1381 spin_unlock(&nfs_client_lock);
1382 }
1383
1384 /*
1385 * display a header line followed by a load of call lines
1386 */
1387 static int nfs_server_list_show(struct seq_file *m, void *v)
1388 {
1389 struct nfs_client *clp;
1390
1391 /* display header on line 1 */
1392 if (v == &nfs_client_list) {
1393 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1394 return 0;
1395 }
1396
1397 /* display one transport per line on subsequent lines */
1398 clp = list_entry(v, struct nfs_client, cl_share_link);
1399
1400 seq_printf(m, "v%u %s %s %3d %s\n",
1401 clp->rpc_ops->version,
1402 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1403 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1404 atomic_read(&clp->cl_count),
1405 clp->cl_hostname);
1406
1407 return 0;
1408 }
1409
1410 /*
1411 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1412 */
1413 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1414 {
1415 struct seq_file *m;
1416 int ret;
1417
1418 ret = seq_open(file, &nfs_volume_list_ops);
1419 if (ret < 0)
1420 return ret;
1421
1422 m = file->private_data;
1423 m->private = PDE(inode)->data;
1424
1425 return 0;
1426 }
1427
1428 /*
1429 * set up the iterator to start reading from the volume list and return the first item
1430 */
1431 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1432 {
1433 /* lock the list against modification */
1434 spin_lock(&nfs_client_lock);
1435 return seq_list_start_head(&nfs_volume_list, *_pos);
1436 }
1437
1438 /*
1439 * move to next volume
1440 */
1441 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1442 {
1443 return seq_list_next(v, &nfs_volume_list, pos);
1444 }
1445
1446 /*
1447 * clean up after reading from the transports list
1448 */
1449 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1450 {
1451 spin_unlock(&nfs_client_lock);
1452 }
1453
1454 /*
1455 * display a header line followed by a load of call lines
1456 */
1457 static int nfs_volume_list_show(struct seq_file *m, void *v)
1458 {
1459 struct nfs_server *server;
1460 struct nfs_client *clp;
1461 char dev[8], fsid[17];
1462
1463 /* display header on line 1 */
1464 if (v == &nfs_volume_list) {
1465 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1466 return 0;
1467 }
1468 /* display one transport per line on subsequent lines */
1469 server = list_entry(v, struct nfs_server, master_link);
1470 clp = server->nfs_client;
1471
1472 snprintf(dev, 8, "%u:%u",
1473 MAJOR(server->s_dev), MINOR(server->s_dev));
1474
1475 snprintf(fsid, 17, "%llx:%llx",
1476 (unsigned long long) server->fsid.major,
1477 (unsigned long long) server->fsid.minor);
1478
1479 seq_printf(m, "v%u %s %s %-7s %-17s\n",
1480 clp->rpc_ops->version,
1481 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1482 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1483 dev,
1484 fsid);
1485
1486 return 0;
1487 }
1488
1489 /*
1490 * initialise the /proc/fs/nfsfs/ directory
1491 */
1492 int __init nfs_fs_proc_init(void)
1493 {
1494 struct proc_dir_entry *p;
1495
1496 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
1497 if (!proc_fs_nfs)
1498 goto error_0;
1499
1500 proc_fs_nfs->owner = THIS_MODULE;
1501
1502 /* a file of servers with which we're dealing */
1503 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs);
1504 if (!p)
1505 goto error_1;
1506
1507 p->proc_fops = &nfs_server_list_fops;
1508 p->owner = THIS_MODULE;
1509
1510 /* a file of volumes that we have mounted */
1511 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
1512 if (!p)
1513 goto error_2;
1514
1515 p->proc_fops = &nfs_volume_list_fops;
1516 p->owner = THIS_MODULE;
1517 return 0;
1518
1519 error_2:
1520 remove_proc_entry("servers", proc_fs_nfs);
1521 error_1:
1522 remove_proc_entry("nfsfs", proc_root_fs);
1523 error_0:
1524 return -ENOMEM;
1525 }
1526
1527 /*
1528 * clean up the /proc/fs/nfsfs/ directory
1529 */
1530 void nfs_fs_proc_exit(void)
1531 {
1532 remove_proc_entry("volumes", proc_fs_nfs);
1533 remove_proc_entry("servers", proc_fs_nfs);
1534 remove_proc_entry("nfsfs", proc_root_fs);
1535 }
1536
1537 #endif /* CONFIG_PROC_FS */
Linux kernel - Deliverables
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