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[PATCH] Make number of IDE interfaces configurable
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / client.c
blob8106f3b29e4aa9747fd786280b132d7c41332154
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/config.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16
17 #include <linux/time.h>
18 #include <linux/kernel.h>
19 #include <linux/mm.h>
20 #include <linux/string.h>
21 #include <linux/stat.h>
22 #include <linux/errno.h>
23 #include <linux/unistd.h>
24 #include <linux/sunrpc/clnt.h>
25 #include <linux/sunrpc/stats.h>
26 #include <linux/sunrpc/metrics.h>
27 #include <linux/nfs_fs.h>
28 #include <linux/nfs_mount.h>
29 #include <linux/nfs4_mount.h>
30 #include <linux/lockd/bind.h>
31 #include <linux/smp_lock.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/nfs_xdr.h>
38
39 #include <asm/system.h>
40
41 #include "nfs4_fs.h"
42 #include "callback.h"
43 #include "delegation.h"
44 #include "iostat.h"
45 #include "internal.h"
46
47 #define NFSDBG_FACILITY NFSDBG_CLIENT
48
49 static DEFINE_SPINLOCK(nfs_client_lock);
50 static LIST_HEAD(nfs_client_list);
51 static LIST_HEAD(nfs_volume_list);
52 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
53
54 /*
55 * RPC cruft for NFS
56 */
57 static struct rpc_version *nfs_version[5] = {
58 [2] = &nfs_version2,
59 #ifdef CONFIG_NFS_V3
60 [3] = &nfs_version3,
61 #endif
62 #ifdef CONFIG_NFS_V4
63 [4] = &nfs_version4,
64 #endif
65 };
66
67 struct rpc_program nfs_program = {
68 .name = "nfs",
69 .number = NFS_PROGRAM,
70 .nrvers = ARRAY_SIZE(nfs_version),
71 .version = nfs_version,
72 .stats = &nfs_rpcstat,
73 .pipe_dir_name = "/nfs",
74 };
75
76 struct rpc_stat nfs_rpcstat = {
77 .program = &nfs_program
78 };
79
80
81 #ifdef CONFIG_NFS_V3_ACL
82 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
83 static struct rpc_version * nfsacl_version[] = {
84 [3] = &nfsacl_version3,
85 };
86
87 struct rpc_program nfsacl_program = {
88 .name = "nfsacl",
89 .number = NFS_ACL_PROGRAM,
90 .nrvers = ARRAY_SIZE(nfsacl_version),
91 .version = nfsacl_version,
92 .stats = &nfsacl_rpcstat,
93 };
94 #endif /* CONFIG_NFS_V3_ACL */
95
96 /*
97 * Allocate a shared client record
98 *
99 * Since these are allocated/deallocated very rarely, we don't
100 * bother putting them in a slab cache...
101 */
102 static struct nfs_client *nfs_alloc_client(const char *hostname,
103 const struct sockaddr_in *addr,
104 int nfsversion)
105 {
106 struct nfs_client *clp;
107 int error;
108
109 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
110 goto error_0;
111
112 error = rpciod_up();
113 if (error < 0) {
114 dprintk("%s: couldn't start rpciod! Error = %d\n",
115 __FUNCTION__, error);
116 goto error_1;
117 }
118 __set_bit(NFS_CS_RPCIOD, &clp->cl_res_state);
119
120 if (nfsversion == 4) {
121 if (nfs_callback_up() < 0)
122 goto error_2;
123 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
124 }
125
126 atomic_set(&clp->cl_count, 1);
127 clp->cl_cons_state = NFS_CS_INITING;
128
129 clp->cl_nfsversion = nfsversion;
130 memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr));
131
132 if (hostname) {
133 clp->cl_hostname = kstrdup(hostname, GFP_KERNEL);
134 if (!clp->cl_hostname)
135 goto error_3;
136 }
137
138 INIT_LIST_HEAD(&clp->cl_superblocks);
139 clp->cl_rpcclient = ERR_PTR(-EINVAL);
140
141 #ifdef CONFIG_NFS_V4
142 init_rwsem(&clp->cl_sem);
143 INIT_LIST_HEAD(&clp->cl_delegations);
144 INIT_LIST_HEAD(&clp->cl_state_owners);
145 INIT_LIST_HEAD(&clp->cl_unused);
146 spin_lock_init(&clp->cl_lock);
147 INIT_WORK(&clp->cl_renewd, nfs4_renew_state, clp);
148 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
149 clp->cl_boot_time = CURRENT_TIME;
150 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
151 #endif
152
153 return clp;
154
155 error_3:
156 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
157 nfs_callback_down();
158 error_2:
159 rpciod_down();
160 __clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state);
161 error_1:
162 kfree(clp);
163 error_0:
164 return NULL;
165 }
166
167 static void nfs4_shutdown_client(struct nfs_client *clp)
168 {
169 #ifdef CONFIG_NFS_V4
170 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
171 nfs4_kill_renewd(clp);
172 while (!list_empty(&clp->cl_unused)) {
173 struct nfs4_state_owner *sp;
174
175 sp = list_entry(clp->cl_unused.next,
176 struct nfs4_state_owner,
177 so_list);
178 list_del(&sp->so_list);
179 kfree(sp);
180 }
181 BUG_ON(!list_empty(&clp->cl_state_owners));
182 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
183 nfs_idmap_delete(clp);
184 #endif
185 }
186
187 /*
188 * Destroy a shared client record
189 */
190 static void nfs_free_client(struct nfs_client *clp)
191 {
192 dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion);
193
194 nfs4_shutdown_client(clp);
195
196 /* -EIO all pending I/O */
197 if (!IS_ERR(clp->cl_rpcclient))
198 rpc_shutdown_client(clp->cl_rpcclient);
199
200 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
201 nfs_callback_down();
202
203 if (__test_and_clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state))
204 rpciod_down();
205
206 kfree(clp->cl_hostname);
207 kfree(clp);
208
209 dprintk("<-- nfs_free_client()\n");
210 }
211
212 /*
213 * Release a reference to a shared client record
214 */
215 void nfs_put_client(struct nfs_client *clp)
216 {
217 if (!clp)
218 return;
219
220 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
221
222 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
223 list_del(&clp->cl_share_link);
224 spin_unlock(&nfs_client_lock);
225
226 BUG_ON(!list_empty(&clp->cl_superblocks));
227
228 nfs_free_client(clp);
229 }
230 }
231
232 /*
233 * Find a client by address
234 * - caller must hold nfs_client_lock
235 */
236 static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
237 {
238 struct nfs_client *clp;
239
240 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
241 /* Different NFS versions cannot share the same nfs_client */
242 if (clp->cl_nfsversion != nfsversion)
243 continue;
244
245 if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr,
246 sizeof(clp->cl_addr.sin_addr)) != 0)
247 continue;
248
249 if (clp->cl_addr.sin_port == addr->sin_port)
250 goto found;
251 }
252
253 return NULL;
254
255 found:
256 atomic_inc(&clp->cl_count);
257 return clp;
258 }
259
260 /*
261 * Find a client by IP address and protocol version
262 * - returns NULL if no such client
263 */
264 struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
265 {
266 struct nfs_client *clp;
267
268 spin_lock(&nfs_client_lock);
269 clp = __nfs_find_client(addr, nfsversion);
270 spin_unlock(&nfs_client_lock);
271
272 BUG_ON(clp && clp->cl_cons_state == 0);
273
274 return clp;
275 }
276
277 /*
278 * Look up a client by IP address and protocol version
279 * - creates a new record if one doesn't yet exist
280 */
281 static struct nfs_client *nfs_get_client(const char *hostname,
282 const struct sockaddr_in *addr,
283 int nfsversion)
284 {
285 struct nfs_client *clp, *new = NULL;
286 int error;
287
288 dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n",
289 hostname ?: "", NIPQUAD(addr->sin_addr),
290 addr->sin_port, nfsversion);
291
292 /* see if the client already exists */
293 do {
294 spin_lock(&nfs_client_lock);
295
296 clp = __nfs_find_client(addr, nfsversion);
297 if (clp)
298 goto found_client;
299 if (new)
300 goto install_client;
301
302 spin_unlock(&nfs_client_lock);
303
304 new = nfs_alloc_client(hostname, addr, nfsversion);
305 } while (new);
306
307 return ERR_PTR(-ENOMEM);
308
309 /* install a new client and return with it unready */
310 install_client:
311 clp = new;
312 list_add(&clp->cl_share_link, &nfs_client_list);
313 spin_unlock(&nfs_client_lock);
314 dprintk("--> nfs_get_client() = %p [new]\n", clp);
315 return clp;
316
317 /* found an existing client
318 * - make sure it's ready before returning
319 */
320 found_client:
321 spin_unlock(&nfs_client_lock);
322
323 if (new)
324 nfs_free_client(new);
325
326 if (clp->cl_cons_state == NFS_CS_INITING) {
327 DECLARE_WAITQUEUE(myself, current);
328
329 add_wait_queue(&nfs_client_active_wq, &myself);
330
331 for (;;) {
332 set_current_state(TASK_INTERRUPTIBLE);
333 if (signal_pending(current) ||
334 clp->cl_cons_state > NFS_CS_READY)
335 break;
336 schedule();
337 }
338
339 remove_wait_queue(&nfs_client_active_wq, &myself);
340
341 if (signal_pending(current)) {
342 nfs_put_client(clp);
343 return ERR_PTR(-ERESTARTSYS);
344 }
345 }
346
347 if (clp->cl_cons_state < NFS_CS_READY) {
348 error = clp->cl_cons_state;
349 nfs_put_client(clp);
350 return ERR_PTR(error);
351 }
352
353 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
354
355 dprintk("--> nfs_get_client() = %p [share]\n", clp);
356 return clp;
357 }
358
359 /*
360 * Mark a server as ready or failed
361 */
362 static void nfs_mark_client_ready(struct nfs_client *clp, int state)
363 {
364 clp->cl_cons_state = state;
365 wake_up_all(&nfs_client_active_wq);
366 }
367
368 /*
369 * Initialise the timeout values for a connection
370 */
371 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
372 unsigned int timeo, unsigned int retrans)
373 {
374 to->to_initval = timeo * HZ / 10;
375 to->to_retries = retrans;
376 if (!to->to_retries)
377 to->to_retries = 2;
378
379 switch (proto) {
380 case IPPROTO_TCP:
381 if (!to->to_initval)
382 to->to_initval = 60 * HZ;
383 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
384 to->to_initval = NFS_MAX_TCP_TIMEOUT;
385 to->to_increment = to->to_initval;
386 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
387 to->to_exponential = 0;
388 break;
389 case IPPROTO_UDP:
390 default:
391 if (!to->to_initval)
392 to->to_initval = 11 * HZ / 10;
393 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
394 to->to_initval = NFS_MAX_UDP_TIMEOUT;
395 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
396 to->to_exponential = 1;
397 break;
398 }
399 }
400
401 /*
402 * Create an RPC client handle
403 */
404 static int nfs_create_rpc_client(struct nfs_client *clp, int proto,
405 unsigned int timeo,
406 unsigned int retrans,
407 rpc_authflavor_t flavor)
408 {
409 struct rpc_timeout timeparms;
410 struct rpc_clnt *clnt = NULL;
411 struct rpc_create_args args = {
412 .protocol = proto,
413 .address = (struct sockaddr *)&clp->cl_addr,
414 .addrsize = sizeof(clp->cl_addr),
415 .timeout = &timeparms,
416 .servername = clp->cl_hostname,
417 .program = &nfs_program,
418 .version = clp->rpc_ops->version,
419 .authflavor = flavor,
420 };
421
422 if (!IS_ERR(clp->cl_rpcclient))
423 return 0;
424
425 nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
426 clp->retrans_timeo = timeparms.to_initval;
427 clp->retrans_count = timeparms.to_retries;
428
429 clnt = rpc_create(&args);
430 if (IS_ERR(clnt)) {
431 dprintk("%s: cannot create RPC client. Error = %ld\n",
432 __FUNCTION__, PTR_ERR(clnt));
433 return PTR_ERR(clnt);
434 }
435
436 clp->cl_rpcclient = clnt;
437 return 0;
438 }
439
440 /*
441 * Version 2 or 3 client destruction
442 */
443 static void nfs_destroy_server(struct nfs_server *server)
444 {
445 if (!IS_ERR(server->client_acl))
446 rpc_shutdown_client(server->client_acl);
447
448 if (!(server->flags & NFS_MOUNT_NONLM))
449 lockd_down(); /* release rpc.lockd */
450 }
451
452 /*
453 * Version 2 or 3 lockd setup
454 */
455 static int nfs_start_lockd(struct nfs_server *server)
456 {
457 int error = 0;
458
459 if (server->nfs_client->cl_nfsversion > 3)
460 goto out;
461 if (server->flags & NFS_MOUNT_NONLM)
462 goto out;
463 error = lockd_up((server->flags & NFS_MOUNT_TCP) ?
464 IPPROTO_TCP : IPPROTO_UDP);
465 if (error < 0)
466 server->flags |= NFS_MOUNT_NONLM;
467 else
468 server->destroy = nfs_destroy_server;
469 out:
470 return error;
471 }
472
473 /*
474 * Initialise an NFSv3 ACL client connection
475 */
476 #ifdef CONFIG_NFS_V3_ACL
477 static void nfs_init_server_aclclient(struct nfs_server *server)
478 {
479 if (server->nfs_client->cl_nfsversion != 3)
480 goto out_noacl;
481 if (server->flags & NFS_MOUNT_NOACL)
482 goto out_noacl;
483
484 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
485 if (IS_ERR(server->client_acl))
486 goto out_noacl;
487
488 /* No errors! Assume that Sun nfsacls are supported */
489 server->caps |= NFS_CAP_ACLS;
490 return;
491
492 out_noacl:
493 server->caps &= ~NFS_CAP_ACLS;
494 }
495 #else
496 static inline void nfs_init_server_aclclient(struct nfs_server *server)
497 {
498 server->flags &= ~NFS_MOUNT_NOACL;
499 server->caps &= ~NFS_CAP_ACLS;
500 }
501 #endif
502
503 /*
504 * Create a general RPC client
505 */
506 static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour)
507 {
508 struct nfs_client *clp = server->nfs_client;
509
510 server->client = rpc_clone_client(clp->cl_rpcclient);
511 if (IS_ERR(server->client)) {
512 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
513 return PTR_ERR(server->client);
514 }
515
516 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
517 struct rpc_auth *auth;
518
519 auth = rpcauth_create(pseudoflavour, server->client);
520 if (IS_ERR(auth)) {
521 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
522 return PTR_ERR(auth);
523 }
524 }
525 server->client->cl_softrtry = 0;
526 if (server->flags & NFS_MOUNT_SOFT)
527 server->client->cl_softrtry = 1;
528
529 server->client->cl_intr = 0;
530 if (server->flags & NFS4_MOUNT_INTR)
531 server->client->cl_intr = 1;
532
533 return 0;
534 }
535
536 /*
537 * Initialise an NFS2 or NFS3 client
538 */
539 static int nfs_init_client(struct nfs_client *clp, const struct nfs_mount_data *data)
540 {
541 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
542 int error;
543
544 if (clp->cl_cons_state == NFS_CS_READY) {
545 /* the client is already initialised */
546 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
547 return 0;
548 }
549
550 /* Check NFS protocol revision and initialize RPC op vector */
551 clp->rpc_ops = &nfs_v2_clientops;
552 #ifdef CONFIG_NFS_V3
553 if (clp->cl_nfsversion == 3)
554 clp->rpc_ops = &nfs_v3_clientops;
555 #endif
556 /*
557 * Create a client RPC handle for doing FSSTAT with UNIX auth only
558 * - RFC 2623, sec 2.3.2
559 */
560 error = nfs_create_rpc_client(clp, proto, data->timeo, data->retrans,
561 RPC_AUTH_UNIX);
562 if (error < 0)
563 goto error;
564 nfs_mark_client_ready(clp, NFS_CS_READY);
565 return 0;
566
567 error:
568 nfs_mark_client_ready(clp, error);
569 dprintk("<-- nfs_init_client() = xerror %d\n", error);
570 return error;
571 }
572
573 /*
574 * Create a version 2 or 3 client
575 */
576 static int nfs_init_server(struct nfs_server *server, const struct nfs_mount_data *data)
577 {
578 struct nfs_client *clp;
579 int error, nfsvers = 2;
580
581 dprintk("--> nfs_init_server()\n");
582
583 #ifdef CONFIG_NFS_V3
584 if (data->flags & NFS_MOUNT_VER3)
585 nfsvers = 3;
586 #endif
587
588 /* Allocate or find a client reference we can use */
589 clp = nfs_get_client(data->hostname, &data->addr, nfsvers);
590 if (IS_ERR(clp)) {
591 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
592 return PTR_ERR(clp);
593 }
594
595 error = nfs_init_client(clp, data);
596 if (error < 0)
597 goto error;
598
599 server->nfs_client = clp;
600
601 /* Initialise the client representation from the mount data */
602 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
603
604 if (data->rsize)
605 server->rsize = nfs_block_size(data->rsize, NULL);
606 if (data->wsize)
607 server->wsize = nfs_block_size(data->wsize, NULL);
608
609 server->acregmin = data->acregmin * HZ;
610 server->acregmax = data->acregmax * HZ;
611 server->acdirmin = data->acdirmin * HZ;
612 server->acdirmax = data->acdirmax * HZ;
613
614 /* Start lockd here, before we might error out */
615 error = nfs_start_lockd(server);
616 if (error < 0)
617 goto error;
618
619 error = nfs_init_server_rpcclient(server, data->pseudoflavor);
620 if (error < 0)
621 goto error;
622
623 server->namelen = data->namlen;
624 /* Create a client RPC handle for the NFSv3 ACL management interface */
625 nfs_init_server_aclclient(server);
626 if (clp->cl_nfsversion == 3) {
627 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
628 server->namelen = NFS3_MAXNAMLEN;
629 server->caps |= NFS_CAP_READDIRPLUS;
630 } else {
631 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
632 server->namelen = NFS2_MAXNAMLEN;
633 }
634
635 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
636 return 0;
637
638 error:
639 server->nfs_client = NULL;
640 nfs_put_client(clp);
641 dprintk("<-- nfs_init_server() = xerror %d\n", error);
642 return error;
643 }
644
645 /*
646 * Load up the server record from information gained in an fsinfo record
647 */
648 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
649 {
650 unsigned long max_rpc_payload;
651
652 /* Work out a lot of parameters */
653 if (server->rsize == 0)
654 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
655 if (server->wsize == 0)
656 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
657
658 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
659 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
660 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
661 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
662
663 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
664 if (server->rsize > max_rpc_payload)
665 server->rsize = max_rpc_payload;
666 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
667 server->rsize = NFS_MAX_FILE_IO_SIZE;
668 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
669 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
670
671 if (server->wsize > max_rpc_payload)
672 server->wsize = max_rpc_payload;
673 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
674 server->wsize = NFS_MAX_FILE_IO_SIZE;
675 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
676 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
677
678 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
679 if (server->dtsize > PAGE_CACHE_SIZE)
680 server->dtsize = PAGE_CACHE_SIZE;
681 if (server->dtsize > server->rsize)
682 server->dtsize = server->rsize;
683
684 if (server->flags & NFS_MOUNT_NOAC) {
685 server->acregmin = server->acregmax = 0;
686 server->acdirmin = server->acdirmax = 0;
687 }
688
689 server->maxfilesize = fsinfo->maxfilesize;
690
691 /* We're airborne Set socket buffersize */
692 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
693 }
694
695 /*
696 * Probe filesystem information, including the FSID on v2/v3
697 */
698 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
699 {
700 struct nfs_fsinfo fsinfo;
701 struct nfs_client *clp = server->nfs_client;
702 int error;
703
704 dprintk("--> nfs_probe_fsinfo()\n");
705
706 if (clp->rpc_ops->set_capabilities != NULL) {
707 error = clp->rpc_ops->set_capabilities(server, mntfh);
708 if (error < 0)
709 goto out_error;
710 }
711
712 fsinfo.fattr = fattr;
713 nfs_fattr_init(fattr);
714 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
715 if (error < 0)
716 goto out_error;
717
718 nfs_server_set_fsinfo(server, &fsinfo);
719
720 /* Get some general file system info */
721 if (server->namelen == 0) {
722 struct nfs_pathconf pathinfo;
723
724 pathinfo.fattr = fattr;
725 nfs_fattr_init(fattr);
726
727 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
728 server->namelen = pathinfo.max_namelen;
729 }
730
731 dprintk("<-- nfs_probe_fsinfo() = 0\n");
732 return 0;
733
734 out_error:
735 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
736 return error;
737 }
738
739 /*
740 * Copy useful information when duplicating a server record
741 */
742 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
743 {
744 target->flags = source->flags;
745 target->acregmin = source->acregmin;
746 target->acregmax = source->acregmax;
747 target->acdirmin = source->acdirmin;
748 target->acdirmax = source->acdirmax;
749 target->caps = source->caps;
750 }
751
752 /*
753 * Allocate and initialise a server record
754 */
755 static struct nfs_server *nfs_alloc_server(void)
756 {
757 struct nfs_server *server;
758
759 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
760 if (!server)
761 return NULL;
762
763 server->client = server->client_acl = ERR_PTR(-EINVAL);
764
765 /* Zero out the NFS state stuff */
766 INIT_LIST_HEAD(&server->client_link);
767 INIT_LIST_HEAD(&server->master_link);
768
769 server->io_stats = nfs_alloc_iostats();
770 if (!server->io_stats) {
771 kfree(server);
772 return NULL;
773 }
774
775 return server;
776 }
777
778 /*
779 * Free up a server record
780 */
781 void nfs_free_server(struct nfs_server *server)
782 {
783 dprintk("--> nfs_free_server()\n");
784
785 spin_lock(&nfs_client_lock);
786 list_del(&server->client_link);
787 list_del(&server->master_link);
788 spin_unlock(&nfs_client_lock);
789
790 if (server->destroy != NULL)
791 server->destroy(server);
792 if (!IS_ERR(server->client))
793 rpc_shutdown_client(server->client);
794
795 nfs_put_client(server->nfs_client);
796
797 nfs_free_iostats(server->io_stats);
798 kfree(server);
799 nfs_release_automount_timer();
800 dprintk("<-- nfs_free_server()\n");
801 }
802
803 /*
804 * Create a version 2 or 3 volume record
805 * - keyed on server and FSID
806 */
807 struct nfs_server *nfs_create_server(const struct nfs_mount_data *data,
808 struct nfs_fh *mntfh)
809 {
810 struct nfs_server *server;
811 struct nfs_fattr fattr;
812 int error;
813
814 server = nfs_alloc_server();
815 if (!server)
816 return ERR_PTR(-ENOMEM);
817
818 /* Get a client representation */
819 error = nfs_init_server(server, data);
820 if (error < 0)
821 goto error;
822
823 BUG_ON(!server->nfs_client);
824 BUG_ON(!server->nfs_client->rpc_ops);
825 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
826
827 /* Probe the root fh to retrieve its FSID */
828 error = nfs_probe_fsinfo(server, mntfh, &fattr);
829 if (error < 0)
830 goto error;
831 if (!(fattr.valid & NFS_ATTR_FATTR)) {
832 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
833 if (error < 0) {
834 dprintk("nfs_create_server: getattr error = %d\n", -error);
835 goto error;
836 }
837 }
838 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
839
840 dprintk("Server FSID: %llx:%llx\n",
841 (unsigned long long) server->fsid.major,
842 (unsigned long long) server->fsid.minor);
843
844 BUG_ON(!server->nfs_client);
845 BUG_ON(!server->nfs_client->rpc_ops);
846 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
847
848 spin_lock(&nfs_client_lock);
849 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
850 list_add_tail(&server->master_link, &nfs_volume_list);
851 spin_unlock(&nfs_client_lock);
852
853 server->mount_time = jiffies;
854 return server;
855
856 error:
857 nfs_free_server(server);
858 return ERR_PTR(error);
859 }
860
861 #ifdef CONFIG_NFS_V4
862 /*
863 * Initialise an NFS4 client record
864 */
865 static int nfs4_init_client(struct nfs_client *clp,
866 int proto, int timeo, int retrans,
867 rpc_authflavor_t authflavour)
868 {
869 int error;
870
871 if (clp->cl_cons_state == NFS_CS_READY) {
872 /* the client is initialised already */
873 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
874 return 0;
875 }
876
877 /* Check NFS protocol revision and initialize RPC op vector */
878 clp->rpc_ops = &nfs_v4_clientops;
879
880 error = nfs_create_rpc_client(clp, proto, timeo, retrans, authflavour);
881 if (error < 0)
882 goto error;
883
884 error = nfs_idmap_new(clp);
885 if (error < 0) {
886 dprintk("%s: failed to create idmapper. Error = %d\n",
887 __FUNCTION__, error);
888 goto error;
889 }
890 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
891
892 nfs_mark_client_ready(clp, NFS_CS_READY);
893 return 0;
894
895 error:
896 nfs_mark_client_ready(clp, error);
897 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
898 return error;
899 }
900
901 /*
902 * Set up an NFS4 client
903 */
904 static int nfs4_set_client(struct nfs_server *server,
905 const char *hostname, const struct sockaddr_in *addr,
906 rpc_authflavor_t authflavour,
907 int proto, int timeo, int retrans)
908 {
909 struct nfs_client *clp;
910 int error;
911
912 dprintk("--> nfs4_set_client()\n");
913
914 /* Allocate or find a client reference we can use */
915 clp = nfs_get_client(hostname, addr, 4);
916 if (IS_ERR(clp)) {
917 error = PTR_ERR(clp);
918 goto error;
919 }
920 error = nfs4_init_client(clp, proto, timeo, retrans, authflavour);
921 if (error < 0)
922 goto error_put;
923
924 server->nfs_client = clp;
925 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
926 return 0;
927
928 error_put:
929 nfs_put_client(clp);
930 error:
931 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
932 return error;
933 }
934
935 /*
936 * Create a version 4 volume record
937 */
938 static int nfs4_init_server(struct nfs_server *server,
939 const struct nfs4_mount_data *data, rpc_authflavor_t authflavour)
940 {
941 int error;
942
943 dprintk("--> nfs4_init_server()\n");
944
945 /* Initialise the client representation from the mount data */
946 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
947 server->caps |= NFS_CAP_ATOMIC_OPEN;
948
949 if (data->rsize)
950 server->rsize = nfs_block_size(data->rsize, NULL);
951 if (data->wsize)
952 server->wsize = nfs_block_size(data->wsize, NULL);
953
954 server->acregmin = data->acregmin * HZ;
955 server->acregmax = data->acregmax * HZ;
956 server->acdirmin = data->acdirmin * HZ;
957 server->acdirmax = data->acdirmax * HZ;
958
959 error = nfs_init_server_rpcclient(server, authflavour);
960
961 /* Done */
962 dprintk("<-- nfs4_init_server() = %d\n", error);
963 return error;
964 }
965
966 /*
967 * Create a version 4 volume record
968 * - keyed on server and FSID
969 */
970 struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *data,
971 const char *hostname,
972 const struct sockaddr_in *addr,
973 const char *mntpath,
974 const char *ip_addr,
975 rpc_authflavor_t authflavour,
976 struct nfs_fh *mntfh)
977 {
978 struct nfs_fattr fattr;
979 struct nfs_server *server;
980 int error;
981
982 dprintk("--> nfs4_create_server()\n");
983
984 server = nfs_alloc_server();
985 if (!server)
986 return ERR_PTR(-ENOMEM);
987
988 /* Get a client record */
989 error = nfs4_set_client(server, hostname, addr, authflavour,
990 data->proto, data->timeo, data->retrans);
991 if (error < 0)
992 goto error;
993
994 /* set up the general RPC client */
995 error = nfs4_init_server(server, data, authflavour);
996 if (error < 0)
997 goto error;
998
999 BUG_ON(!server->nfs_client);
1000 BUG_ON(!server->nfs_client->rpc_ops);
1001 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1002
1003 /* Probe the root fh to retrieve its FSID */
1004 error = nfs4_path_walk(server, mntfh, mntpath);
1005 if (error < 0)
1006 goto error;
1007
1008 dprintk("Server FSID: %llx:%llx\n",
1009 (unsigned long long) server->fsid.major,
1010 (unsigned long long) server->fsid.minor);
1011 dprintk("Mount FH: %d\n", mntfh->size);
1012
1013 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1014 if (error < 0)
1015 goto error;
1016
1017 BUG_ON(!server->nfs_client);
1018 BUG_ON(!server->nfs_client->rpc_ops);
1019 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1020
1021 spin_lock(&nfs_client_lock);
1022 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1023 list_add_tail(&server->master_link, &nfs_volume_list);
1024 spin_unlock(&nfs_client_lock);
1025
1026 server->mount_time = jiffies;
1027 dprintk("<-- nfs4_create_server() = %p\n", server);
1028 return server;
1029
1030 error:
1031 nfs_free_server(server);
1032 dprintk("<-- nfs4_create_server() = error %d\n", error);
1033 return ERR_PTR(error);
1034 }
1035
1036 /*
1037 * Create an NFS4 referral server record
1038 */
1039 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1040 struct nfs_fh *fh)
1041 {
1042 struct nfs_client *parent_client;
1043 struct nfs_server *server, *parent_server;
1044 struct nfs_fattr fattr;
1045 int error;
1046
1047 dprintk("--> nfs4_create_referral_server()\n");
1048
1049 server = nfs_alloc_server();
1050 if (!server)
1051 return ERR_PTR(-ENOMEM);
1052
1053 parent_server = NFS_SB(data->sb);
1054 parent_client = parent_server->nfs_client;
1055
1056 /* Get a client representation.
1057 * Note: NFSv4 always uses TCP, */
1058 error = nfs4_set_client(server, data->hostname, data->addr,
1059 data->authflavor,
1060 parent_server->client->cl_xprt->prot,
1061 parent_client->retrans_timeo,
1062 parent_client->retrans_count);
1063 if (error < 0)
1064 goto error;
1065
1066 /* Initialise the client representation from the parent server */
1067 nfs_server_copy_userdata(server, parent_server);
1068 server->caps |= NFS_CAP_ATOMIC_OPEN;
1069
1070 error = nfs_init_server_rpcclient(server, data->authflavor);
1071 if (error < 0)
1072 goto error;
1073
1074 BUG_ON(!server->nfs_client);
1075 BUG_ON(!server->nfs_client->rpc_ops);
1076 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1077
1078 /* probe the filesystem info for this server filesystem */
1079 error = nfs_probe_fsinfo(server, fh, &fattr);
1080 if (error < 0)
1081 goto error;
1082
1083 dprintk("Referral FSID: %llx:%llx\n",
1084 (unsigned long long) server->fsid.major,
1085 (unsigned long long) server->fsid.minor);
1086
1087 spin_lock(&nfs_client_lock);
1088 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1089 list_add_tail(&server->master_link, &nfs_volume_list);
1090 spin_unlock(&nfs_client_lock);
1091
1092 server->mount_time = jiffies;
1093
1094 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1095 return server;
1096
1097 error:
1098 nfs_free_server(server);
1099 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1100 return ERR_PTR(error);
1101 }
1102
1103 #endif /* CONFIG_NFS_V4 */
1104
1105 /*
1106 * Clone an NFS2, NFS3 or NFS4 server record
1107 */
1108 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1109 struct nfs_fh *fh,
1110 struct nfs_fattr *fattr)
1111 {
1112 struct nfs_server *server;
1113 struct nfs_fattr fattr_fsinfo;
1114 int error;
1115
1116 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1117 (unsigned long long) fattr->fsid.major,
1118 (unsigned long long) fattr->fsid.minor);
1119
1120 server = nfs_alloc_server();
1121 if (!server)
1122 return ERR_PTR(-ENOMEM);
1123
1124 /* Copy data from the source */
1125 server->nfs_client = source->nfs_client;
1126 atomic_inc(&server->nfs_client->cl_count);
1127 nfs_server_copy_userdata(server, source);
1128
1129 server->fsid = fattr->fsid;
1130
1131 error = nfs_init_server_rpcclient(server, source->client->cl_auth->au_flavor);
1132 if (error < 0)
1133 goto out_free_server;
1134 if (!IS_ERR(source->client_acl))
1135 nfs_init_server_aclclient(server);
1136
1137 /* probe the filesystem info for this server filesystem */
1138 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1139 if (error < 0)
1140 goto out_free_server;
1141
1142 dprintk("Cloned FSID: %llx:%llx\n",
1143 (unsigned long long) server->fsid.major,
1144 (unsigned long long) server->fsid.minor);
1145
1146 error = nfs_start_lockd(server);
1147 if (error < 0)
1148 goto out_free_server;
1149
1150 spin_lock(&nfs_client_lock);
1151 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1152 list_add_tail(&server->master_link, &nfs_volume_list);
1153 spin_unlock(&nfs_client_lock);
1154
1155 server->mount_time = jiffies;
1156
1157 dprintk("<-- nfs_clone_server() = %p\n", server);
1158 return server;
1159
1160 out_free_server:
1161 nfs_free_server(server);
1162 dprintk("<-- nfs_clone_server() = error %d\n", error);
1163 return ERR_PTR(error);
1164 }
1165
1166 #ifdef CONFIG_PROC_FS
1167 static struct proc_dir_entry *proc_fs_nfs;
1168
1169 static int nfs_server_list_open(struct inode *inode, struct file *file);
1170 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1171 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1172 static void nfs_server_list_stop(struct seq_file *p, void *v);
1173 static int nfs_server_list_show(struct seq_file *m, void *v);
1174
1175 static struct seq_operations nfs_server_list_ops = {
1176 .start = nfs_server_list_start,
1177 .next = nfs_server_list_next,
1178 .stop = nfs_server_list_stop,
1179 .show = nfs_server_list_show,
1180 };
1181
1182 static struct file_operations nfs_server_list_fops = {
1183 .open = nfs_server_list_open,
1184 .read = seq_read,
1185 .llseek = seq_lseek,
1186 .release = seq_release,
1187 };
1188
1189 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1190 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1191 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1192 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1193 static int nfs_volume_list_show(struct seq_file *m, void *v);
1194
1195 static struct seq_operations nfs_volume_list_ops = {
1196 .start = nfs_volume_list_start,
1197 .next = nfs_volume_list_next,
1198 .stop = nfs_volume_list_stop,
1199 .show = nfs_volume_list_show,
1200 };
1201
1202 static struct file_operations nfs_volume_list_fops = {
1203 .open = nfs_volume_list_open,
1204 .read = seq_read,
1205 .llseek = seq_lseek,
1206 .release = seq_release,
1207 };
1208
1209 /*
1210 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1211 * we're dealing
1212 */
1213 static int nfs_server_list_open(struct inode *inode, struct file *file)
1214 {
1215 struct seq_file *m;
1216 int ret;
1217
1218 ret = seq_open(file, &nfs_server_list_ops);
1219 if (ret < 0)
1220 return ret;
1221
1222 m = file->private_data;
1223 m->private = PDE(inode)->data;
1224
1225 return 0;
1226 }
1227
1228 /*
1229 * set up the iterator to start reading from the server list and return the first item
1230 */
1231 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1232 {
1233 struct list_head *_p;
1234 loff_t pos = *_pos;
1235
1236 /* lock the list against modification */
1237 spin_lock(&nfs_client_lock);
1238
1239 /* allow for the header line */
1240 if (!pos)
1241 return SEQ_START_TOKEN;
1242 pos--;
1243
1244 /* find the n'th element in the list */
1245 list_for_each(_p, &nfs_client_list)
1246 if (!pos--)
1247 break;
1248
1249 return _p != &nfs_client_list ? _p : NULL;
1250 }
1251
1252 /*
1253 * move to next server
1254 */
1255 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1256 {
1257 struct list_head *_p;
1258
1259 (*pos)++;
1260
1261 _p = v;
1262 _p = (v == SEQ_START_TOKEN) ? nfs_client_list.next : _p->next;
1263
1264 return _p != &nfs_client_list ? _p : NULL;
1265 }
1266
1267 /*
1268 * clean up after reading from the transports list
1269 */
1270 static void nfs_server_list_stop(struct seq_file *p, void *v)
1271 {
1272 spin_unlock(&nfs_client_lock);
1273 }
1274
1275 /*
1276 * display a header line followed by a load of call lines
1277 */
1278 static int nfs_server_list_show(struct seq_file *m, void *v)
1279 {
1280 struct nfs_client *clp;
1281
1282 /* display header on line 1 */
1283 if (v == SEQ_START_TOKEN) {
1284 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1285 return 0;
1286 }
1287
1288 /* display one transport per line on subsequent lines */
1289 clp = list_entry(v, struct nfs_client, cl_share_link);
1290
1291 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %3d %s\n",
1292 clp->cl_nfsversion,
1293 NIPQUAD(clp->cl_addr.sin_addr),
1294 ntohs(clp->cl_addr.sin_port),
1295 atomic_read(&clp->cl_count),
1296 clp->cl_hostname);
1297
1298 return 0;
1299 }
1300
1301 /*
1302 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1303 */
1304 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1305 {
1306 struct seq_file *m;
1307 int ret;
1308
1309 ret = seq_open(file, &nfs_volume_list_ops);
1310 if (ret < 0)
1311 return ret;
1312
1313 m = file->private_data;
1314 m->private = PDE(inode)->data;
1315
1316 return 0;
1317 }
1318
1319 /*
1320 * set up the iterator to start reading from the volume list and return the first item
1321 */
1322 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1323 {
1324 struct list_head *_p;
1325 loff_t pos = *_pos;
1326
1327 /* lock the list against modification */
1328 spin_lock(&nfs_client_lock);
1329
1330 /* allow for the header line */
1331 if (!pos)
1332 return SEQ_START_TOKEN;
1333 pos--;
1334
1335 /* find the n'th element in the list */
1336 list_for_each(_p, &nfs_volume_list)
1337 if (!pos--)
1338 break;
1339
1340 return _p != &nfs_volume_list ? _p : NULL;
1341 }
1342
1343 /*
1344 * move to next volume
1345 */
1346 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1347 {
1348 struct list_head *_p;
1349
1350 (*pos)++;
1351
1352 _p = v;
1353 _p = (v == SEQ_START_TOKEN) ? nfs_volume_list.next : _p->next;
1354
1355 return _p != &nfs_volume_list ? _p : NULL;
1356 }
1357
1358 /*
1359 * clean up after reading from the transports list
1360 */
1361 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1362 {
1363 spin_unlock(&nfs_client_lock);
1364 }
1365
1366 /*
1367 * display a header line followed by a load of call lines
1368 */
1369 static int nfs_volume_list_show(struct seq_file *m, void *v)
1370 {
1371 struct nfs_server *server;
1372 struct nfs_client *clp;
1373 char dev[8], fsid[17];
1374
1375 /* display header on line 1 */
1376 if (v == SEQ_START_TOKEN) {
1377 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1378 return 0;
1379 }
1380 /* display one transport per line on subsequent lines */
1381 server = list_entry(v, struct nfs_server, master_link);
1382 clp = server->nfs_client;
1383
1384 snprintf(dev, 8, "%u:%u",
1385 MAJOR(server->s_dev), MINOR(server->s_dev));
1386
1387 snprintf(fsid, 17, "%llx:%llx",
1388 (unsigned long long) server->fsid.major,
1389 (unsigned long long) server->fsid.minor);
1390
1391 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %-7s %-17s\n",
1392 clp->cl_nfsversion,
1393 NIPQUAD(clp->cl_addr.sin_addr),
1394 ntohs(clp->cl_addr.sin_port),
1395 dev,
1396 fsid);
1397
1398 return 0;
1399 }
1400
1401 /*
1402 * initialise the /proc/fs/nfsfs/ directory
1403 */
1404 int __init nfs_fs_proc_init(void)
1405 {
1406 struct proc_dir_entry *p;
1407
1408 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
1409 if (!proc_fs_nfs)
1410 goto error_0;
1411
1412 proc_fs_nfs->owner = THIS_MODULE;
1413
1414 /* a file of servers with which we're dealing */
1415 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs);
1416 if (!p)
1417 goto error_1;
1418
1419 p->proc_fops = &nfs_server_list_fops;
1420 p->owner = THIS_MODULE;
1421
1422 /* a file of volumes that we have mounted */
1423 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
1424 if (!p)
1425 goto error_2;
1426
1427 p->proc_fops = &nfs_volume_list_fops;
1428 p->owner = THIS_MODULE;
1429 return 0;
1430
1431 error_2:
1432 remove_proc_entry("servers", proc_fs_nfs);
1433 error_1:
1434 remove_proc_entry("nfsfs", proc_root_fs);
1435 error_0:
1436 return -ENOMEM;
1437 }
1438
1439 /*
1440 * clean up the /proc/fs/nfsfs/ directory
1441 */
1442 void nfs_fs_proc_exit(void)
1443 {
1444 remove_proc_entry("volumes", proc_fs_nfs);
1445 remove_proc_entry("servers", proc_fs_nfs);
1446 remove_proc_entry("nfsfs", proc_root_fs);
1447 }
1448
1449 #endif /* CONFIG_PROC_FS */
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