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get_unmapped_area handles MAP_FIXED on i386
[linux-2.6/zen-sources.git] / fs / nfs / client.c
blob5bd03b97002e1e9dd73f1d36aeecaaf76c94da5c
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
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/nfs_fs.h>
27 #include <linux/nfs_mount.h>
28 #include <linux/nfs4_mount.h>
29 #include <linux/lockd/bind.h>
30 #include <linux/smp_lock.h>
31 #include <linux/seq_file.h>
32 #include <linux/mount.h>
33 #include <linux/nfs_idmap.h>
34 #include <linux/vfs.h>
35 #include <linux/inet.h>
36 #include <linux/nfs_xdr.h>
37
38 #include <asm/system.h>
39
40 #include "nfs4_fs.h"
41 #include "callback.h"
42 #include "delegation.h"
43 #include "iostat.h"
44 #include "internal.h"
45
46 #define NFSDBG_FACILITY NFSDBG_CLIENT
47
48 static DEFINE_SPINLOCK(nfs_client_lock);
49 static LIST_HEAD(nfs_client_list);
50 static LIST_HEAD(nfs_volume_list);
51 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
52
53 /*
54 * RPC cruft for NFS
55 */
56 static struct rpc_version *nfs_version[5] = {
57 [2] = &nfs_version2,
58 #ifdef CONFIG_NFS_V3
59 [3] = &nfs_version3,
60 #endif
61 #ifdef CONFIG_NFS_V4
62 [4] = &nfs_version4,
63 #endif
64 };
65
66 struct rpc_program nfs_program = {
67 .name = "nfs",
68 .number = NFS_PROGRAM,
69 .nrvers = ARRAY_SIZE(nfs_version),
70 .version = nfs_version,
71 .stats = &nfs_rpcstat,
72 .pipe_dir_name = "/nfs",
73 };
74
75 struct rpc_stat nfs_rpcstat = {
76 .program = &nfs_program
77 };
78
79
80 #ifdef CONFIG_NFS_V3_ACL
81 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
82 static struct rpc_version * nfsacl_version[] = {
83 [3] = &nfsacl_version3,
84 };
85
86 struct rpc_program nfsacl_program = {
87 .name = "nfsacl",
88 .number = NFS_ACL_PROGRAM,
89 .nrvers = ARRAY_SIZE(nfsacl_version),
90 .version = nfsacl_version,
91 .stats = &nfsacl_rpcstat,
92 };
93 #endif /* CONFIG_NFS_V3_ACL */
94
95 /*
96 * Allocate a shared client record
97 *
98 * Since these are allocated/deallocated very rarely, we don't
99 * bother putting them in a slab cache...
100 */
101 static struct nfs_client *nfs_alloc_client(const char *hostname,
102 const struct sockaddr_in *addr,
103 int nfsversion)
104 {
105 struct nfs_client *clp;
106 int error;
107
108 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
109 goto error_0;
110
111 error = rpciod_up();
112 if (error < 0) {
113 dprintk("%s: couldn't start rpciod! Error = %d\n",
114 __FUNCTION__, error);
115 goto error_1;
116 }
117 __set_bit(NFS_CS_RPCIOD, &clp->cl_res_state);
118
119 if (nfsversion == 4) {
120 if (nfs_callback_up() < 0)
121 goto error_2;
122 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
123 }
124
125 atomic_set(&clp->cl_count, 1);
126 clp->cl_cons_state = NFS_CS_INITING;
127
128 clp->cl_nfsversion = nfsversion;
129 memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr));
130
131 if (hostname) {
132 clp->cl_hostname = kstrdup(hostname, GFP_KERNEL);
133 if (!clp->cl_hostname)
134 goto error_3;
135 }
136
137 INIT_LIST_HEAD(&clp->cl_superblocks);
138 clp->cl_rpcclient = ERR_PTR(-EINVAL);
139
140 #ifdef CONFIG_NFS_V4
141 init_rwsem(&clp->cl_sem);
142 INIT_LIST_HEAD(&clp->cl_delegations);
143 INIT_LIST_HEAD(&clp->cl_state_owners);
144 INIT_LIST_HEAD(&clp->cl_unused);
145 spin_lock_init(&clp->cl_lock);
146 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
147 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
148 clp->cl_boot_time = CURRENT_TIME;
149 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
150 #endif
151
152 return clp;
153
154 error_3:
155 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
156 nfs_callback_down();
157 error_2:
158 rpciod_down();
159 __clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state);
160 error_1:
161 kfree(clp);
162 error_0:
163 return NULL;
164 }
165
166 static void nfs4_shutdown_client(struct nfs_client *clp)
167 {
168 #ifdef CONFIG_NFS_V4
169 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
170 nfs4_kill_renewd(clp);
171 while (!list_empty(&clp->cl_unused)) {
172 struct nfs4_state_owner *sp;
173
174 sp = list_entry(clp->cl_unused.next,
175 struct nfs4_state_owner,
176 so_list);
177 list_del(&sp->so_list);
178 kfree(sp);
179 }
180 BUG_ON(!list_empty(&clp->cl_state_owners));
181 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
182 nfs_idmap_delete(clp);
183 #endif
184 }
185
186 /*
187 * Destroy a shared client record
188 */
189 static void nfs_free_client(struct nfs_client *clp)
190 {
191 dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion);
192
193 nfs4_shutdown_client(clp);
194
195 /* -EIO all pending I/O */
196 if (!IS_ERR(clp->cl_rpcclient))
197 rpc_shutdown_client(clp->cl_rpcclient);
198
199 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
200 nfs_callback_down();
201
202 if (__test_and_clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state))
203 rpciod_down();
204
205 kfree(clp->cl_hostname);
206 kfree(clp);
207
208 dprintk("<-- nfs_free_client()\n");
209 }
210
211 /*
212 * Release a reference to a shared client record
213 */
214 void nfs_put_client(struct nfs_client *clp)
215 {
216 if (!clp)
217 return;
218
219 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
220
221 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
222 list_del(&clp->cl_share_link);
223 spin_unlock(&nfs_client_lock);
224
225 BUG_ON(!list_empty(&clp->cl_superblocks));
226
227 nfs_free_client(clp);
228 }
229 }
230
231 /*
232 * Find a client by address
233 * - caller must hold nfs_client_lock
234 */
235 static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion, int match_port)
236 {
237 struct nfs_client *clp;
238
239 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
240 /* Don't match clients that failed to initialise properly */
241 if (clp->cl_cons_state < 0)
242 continue;
243
244 /* Different NFS versions cannot share the same nfs_client */
245 if (clp->cl_nfsversion != nfsversion)
246 continue;
247
248 if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr,
249 sizeof(clp->cl_addr.sin_addr)) != 0)
250 continue;
251
252 if (!match_port || clp->cl_addr.sin_port == addr->sin_port)
253 goto found;
254 }
255
256 return NULL;
257
258 found:
259 atomic_inc(&clp->cl_count);
260 return clp;
261 }
262
263 /*
264 * Find a client by IP address and protocol version
265 * - returns NULL if no such client
266 */
267 struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
268 {
269 struct nfs_client *clp;
270
271 spin_lock(&nfs_client_lock);
272 clp = __nfs_find_client(addr, nfsversion, 0);
273 spin_unlock(&nfs_client_lock);
274 if (clp != NULL && clp->cl_cons_state != NFS_CS_READY) {
275 nfs_put_client(clp);
276 clp = NULL;
277 }
278 return clp;
279 }
280
281 /*
282 * Look up a client by IP address and protocol version
283 * - creates a new record if one doesn't yet exist
284 */
285 static struct nfs_client *nfs_get_client(const char *hostname,
286 const struct sockaddr_in *addr,
287 int nfsversion)
288 {
289 struct nfs_client *clp, *new = NULL;
290 int error;
291
292 dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n",
293 hostname ?: "", NIPQUAD(addr->sin_addr),
294 addr->sin_port, nfsversion);
295
296 /* see if the client already exists */
297 do {
298 spin_lock(&nfs_client_lock);
299
300 clp = __nfs_find_client(addr, nfsversion, 1);
301 if (clp)
302 goto found_client;
303 if (new)
304 goto install_client;
305
306 spin_unlock(&nfs_client_lock);
307
308 new = nfs_alloc_client(hostname, addr, nfsversion);
309 } while (new);
310
311 return ERR_PTR(-ENOMEM);
312
313 /* install a new client and return with it unready */
314 install_client:
315 clp = new;
316 list_add(&clp->cl_share_link, &nfs_client_list);
317 spin_unlock(&nfs_client_lock);
318 dprintk("--> nfs_get_client() = %p [new]\n", clp);
319 return clp;
320
321 /* found an existing client
322 * - make sure it's ready before returning
323 */
324 found_client:
325 spin_unlock(&nfs_client_lock);
326
327 if (new)
328 nfs_free_client(new);
329
330 error = wait_event_interruptible(nfs_client_active_wq,
331 clp->cl_cons_state != NFS_CS_INITING);
332 if (error < 0) {
333 nfs_put_client(clp);
334 return ERR_PTR(-ERESTARTSYS);
335 }
336
337 if (clp->cl_cons_state < NFS_CS_READY) {
338 error = clp->cl_cons_state;
339 nfs_put_client(clp);
340 return ERR_PTR(error);
341 }
342
343 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
344
345 dprintk("--> nfs_get_client() = %p [share]\n", clp);
346 return clp;
347 }
348
349 /*
350 * Mark a server as ready or failed
351 */
352 static void nfs_mark_client_ready(struct nfs_client *clp, int state)
353 {
354 clp->cl_cons_state = state;
355 wake_up_all(&nfs_client_active_wq);
356 }
357
358 /*
359 * Initialise the timeout values for a connection
360 */
361 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
362 unsigned int timeo, unsigned int retrans)
363 {
364 to->to_initval = timeo * HZ / 10;
365 to->to_retries = retrans;
366 if (!to->to_retries)
367 to->to_retries = 2;
368
369 switch (proto) {
370 case IPPROTO_TCP:
371 if (!to->to_initval)
372 to->to_initval = 60 * HZ;
373 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
374 to->to_initval = NFS_MAX_TCP_TIMEOUT;
375 to->to_increment = to->to_initval;
376 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
377 to->to_exponential = 0;
378 break;
379 case IPPROTO_UDP:
380 default:
381 if (!to->to_initval)
382 to->to_initval = 11 * HZ / 10;
383 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
384 to->to_initval = NFS_MAX_UDP_TIMEOUT;
385 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
386 to->to_exponential = 1;
387 break;
388 }
389 }
390
391 /*
392 * Create an RPC client handle
393 */
394 static int nfs_create_rpc_client(struct nfs_client *clp, int proto,
395 unsigned int timeo,
396 unsigned int retrans,
397 rpc_authflavor_t flavor,
398 int flags)
399 {
400 struct rpc_timeout timeparms;
401 struct rpc_clnt *clnt = NULL;
402 struct rpc_create_args args = {
403 .protocol = proto,
404 .address = (struct sockaddr *)&clp->cl_addr,
405 .addrsize = sizeof(clp->cl_addr),
406 .timeout = &timeparms,
407 .servername = clp->cl_hostname,
408 .program = &nfs_program,
409 .version = clp->rpc_ops->version,
410 .authflavor = flavor,
411 .flags = flags,
412 };
413
414 if (!IS_ERR(clp->cl_rpcclient))
415 return 0;
416
417 nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
418 clp->retrans_timeo = timeparms.to_initval;
419 clp->retrans_count = timeparms.to_retries;
420
421 clnt = rpc_create(&args);
422 if (IS_ERR(clnt)) {
423 dprintk("%s: cannot create RPC client. Error = %ld\n",
424 __FUNCTION__, PTR_ERR(clnt));
425 return PTR_ERR(clnt);
426 }
427
428 clp->cl_rpcclient = clnt;
429 return 0;
430 }
431
432 /*
433 * Version 2 or 3 client destruction
434 */
435 static void nfs_destroy_server(struct nfs_server *server)
436 {
437 if (!IS_ERR(server->client_acl))
438 rpc_shutdown_client(server->client_acl);
439
440 if (!(server->flags & NFS_MOUNT_NONLM))
441 lockd_down(); /* release rpc.lockd */
442 }
443
444 /*
445 * Version 2 or 3 lockd setup
446 */
447 static int nfs_start_lockd(struct nfs_server *server)
448 {
449 int error = 0;
450
451 if (server->nfs_client->cl_nfsversion > 3)
452 goto out;
453 if (server->flags & NFS_MOUNT_NONLM)
454 goto out;
455 error = lockd_up((server->flags & NFS_MOUNT_TCP) ?
456 IPPROTO_TCP : IPPROTO_UDP);
457 if (error < 0)
458 server->flags |= NFS_MOUNT_NONLM;
459 else
460 server->destroy = nfs_destroy_server;
461 out:
462 return error;
463 }
464
465 /*
466 * Initialise an NFSv3 ACL client connection
467 */
468 #ifdef CONFIG_NFS_V3_ACL
469 static void nfs_init_server_aclclient(struct nfs_server *server)
470 {
471 if (server->nfs_client->cl_nfsversion != 3)
472 goto out_noacl;
473 if (server->flags & NFS_MOUNT_NOACL)
474 goto out_noacl;
475
476 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
477 if (IS_ERR(server->client_acl))
478 goto out_noacl;
479
480 /* No errors! Assume that Sun nfsacls are supported */
481 server->caps |= NFS_CAP_ACLS;
482 return;
483
484 out_noacl:
485 server->caps &= ~NFS_CAP_ACLS;
486 }
487 #else
488 static inline void nfs_init_server_aclclient(struct nfs_server *server)
489 {
490 server->flags &= ~NFS_MOUNT_NOACL;
491 server->caps &= ~NFS_CAP_ACLS;
492 }
493 #endif
494
495 /*
496 * Create a general RPC client
497 */
498 static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour)
499 {
500 struct nfs_client *clp = server->nfs_client;
501
502 server->client = rpc_clone_client(clp->cl_rpcclient);
503 if (IS_ERR(server->client)) {
504 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
505 return PTR_ERR(server->client);
506 }
507
508 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
509 struct rpc_auth *auth;
510
511 auth = rpcauth_create(pseudoflavour, server->client);
512 if (IS_ERR(auth)) {
513 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
514 return PTR_ERR(auth);
515 }
516 }
517 server->client->cl_softrtry = 0;
518 if (server->flags & NFS_MOUNT_SOFT)
519 server->client->cl_softrtry = 1;
520
521 server->client->cl_intr = 0;
522 if (server->flags & NFS4_MOUNT_INTR)
523 server->client->cl_intr = 1;
524
525 return 0;
526 }
527
528 /*
529 * Initialise an NFS2 or NFS3 client
530 */
531 static int nfs_init_client(struct nfs_client *clp, const struct nfs_mount_data *data)
532 {
533 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
534 int error;
535
536 if (clp->cl_cons_state == NFS_CS_READY) {
537 /* the client is already initialised */
538 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
539 return 0;
540 }
541
542 /* Check NFS protocol revision and initialize RPC op vector */
543 clp->rpc_ops = &nfs_v2_clientops;
544 #ifdef CONFIG_NFS_V3
545 if (clp->cl_nfsversion == 3)
546 clp->rpc_ops = &nfs_v3_clientops;
547 #endif
548 /*
549 * Create a client RPC handle for doing FSSTAT with UNIX auth only
550 * - RFC 2623, sec 2.3.2
551 */
552 error = nfs_create_rpc_client(clp, proto, data->timeo, data->retrans,
553 RPC_AUTH_UNIX, 0);
554 if (error < 0)
555 goto error;
556 nfs_mark_client_ready(clp, NFS_CS_READY);
557 return 0;
558
559 error:
560 nfs_mark_client_ready(clp, error);
561 dprintk("<-- nfs_init_client() = xerror %d\n", error);
562 return error;
563 }
564
565 /*
566 * Create a version 2 or 3 client
567 */
568 static int nfs_init_server(struct nfs_server *server, const struct nfs_mount_data *data)
569 {
570 struct nfs_client *clp;
571 int error, nfsvers = 2;
572
573 dprintk("--> nfs_init_server()\n");
574
575 #ifdef CONFIG_NFS_V3
576 if (data->flags & NFS_MOUNT_VER3)
577 nfsvers = 3;
578 #endif
579
580 /* Allocate or find a client reference we can use */
581 clp = nfs_get_client(data->hostname, &data->addr, nfsvers);
582 if (IS_ERR(clp)) {
583 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
584 return PTR_ERR(clp);
585 }
586
587 error = nfs_init_client(clp, data);
588 if (error < 0)
589 goto error;
590
591 server->nfs_client = clp;
592
593 /* Initialise the client representation from the mount data */
594 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
595
596 if (data->rsize)
597 server->rsize = nfs_block_size(data->rsize, NULL);
598 if (data->wsize)
599 server->wsize = nfs_block_size(data->wsize, NULL);
600
601 server->acregmin = data->acregmin * HZ;
602 server->acregmax = data->acregmax * HZ;
603 server->acdirmin = data->acdirmin * HZ;
604 server->acdirmax = data->acdirmax * HZ;
605
606 /* Start lockd here, before we might error out */
607 error = nfs_start_lockd(server);
608 if (error < 0)
609 goto error;
610
611 error = nfs_init_server_rpcclient(server, data->pseudoflavor);
612 if (error < 0)
613 goto error;
614
615 server->namelen = data->namlen;
616 /* Create a client RPC handle for the NFSv3 ACL management interface */
617 nfs_init_server_aclclient(server);
618 if (clp->cl_nfsversion == 3) {
619 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
620 server->namelen = NFS3_MAXNAMLEN;
621 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
622 server->caps |= NFS_CAP_READDIRPLUS;
623 } else {
624 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
625 server->namelen = NFS2_MAXNAMLEN;
626 }
627
628 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
629 return 0;
630
631 error:
632 server->nfs_client = NULL;
633 nfs_put_client(clp);
634 dprintk("<-- nfs_init_server() = xerror %d\n", error);
635 return error;
636 }
637
638 /*
639 * Load up the server record from information gained in an fsinfo record
640 */
641 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
642 {
643 unsigned long max_rpc_payload;
644
645 /* Work out a lot of parameters */
646 if (server->rsize == 0)
647 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
648 if (server->wsize == 0)
649 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
650
651 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
652 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
653 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
654 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
655
656 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
657 if (server->rsize > max_rpc_payload)
658 server->rsize = max_rpc_payload;
659 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
660 server->rsize = NFS_MAX_FILE_IO_SIZE;
661 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
662 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
663
664 if (server->wsize > max_rpc_payload)
665 server->wsize = max_rpc_payload;
666 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
667 server->wsize = NFS_MAX_FILE_IO_SIZE;
668 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
669 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
670
671 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
672 if (server->dtsize > PAGE_CACHE_SIZE)
673 server->dtsize = PAGE_CACHE_SIZE;
674 if (server->dtsize > server->rsize)
675 server->dtsize = server->rsize;
676
677 if (server->flags & NFS_MOUNT_NOAC) {
678 server->acregmin = server->acregmax = 0;
679 server->acdirmin = server->acdirmax = 0;
680 }
681
682 server->maxfilesize = fsinfo->maxfilesize;
683
684 /* We're airborne Set socket buffersize */
685 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
686 }
687
688 /*
689 * Probe filesystem information, including the FSID on v2/v3
690 */
691 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
692 {
693 struct nfs_fsinfo fsinfo;
694 struct nfs_client *clp = server->nfs_client;
695 int error;
696
697 dprintk("--> nfs_probe_fsinfo()\n");
698
699 if (clp->rpc_ops->set_capabilities != NULL) {
700 error = clp->rpc_ops->set_capabilities(server, mntfh);
701 if (error < 0)
702 goto out_error;
703 }
704
705 fsinfo.fattr = fattr;
706 nfs_fattr_init(fattr);
707 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
708 if (error < 0)
709 goto out_error;
710
711 nfs_server_set_fsinfo(server, &fsinfo);
712
713 /* Get some general file system info */
714 if (server->namelen == 0) {
715 struct nfs_pathconf pathinfo;
716
717 pathinfo.fattr = fattr;
718 nfs_fattr_init(fattr);
719
720 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
721 server->namelen = pathinfo.max_namelen;
722 }
723
724 dprintk("<-- nfs_probe_fsinfo() = 0\n");
725 return 0;
726
727 out_error:
728 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
729 return error;
730 }
731
732 /*
733 * Copy useful information when duplicating a server record
734 */
735 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
736 {
737 target->flags = source->flags;
738 target->acregmin = source->acregmin;
739 target->acregmax = source->acregmax;
740 target->acdirmin = source->acdirmin;
741 target->acdirmax = source->acdirmax;
742 target->caps = source->caps;
743 }
744
745 /*
746 * Allocate and initialise a server record
747 */
748 static struct nfs_server *nfs_alloc_server(void)
749 {
750 struct nfs_server *server;
751
752 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
753 if (!server)
754 return NULL;
755
756 server->client = server->client_acl = ERR_PTR(-EINVAL);
757
758 /* Zero out the NFS state stuff */
759 INIT_LIST_HEAD(&server->client_link);
760 INIT_LIST_HEAD(&server->master_link);
761
762 server->io_stats = nfs_alloc_iostats();
763 if (!server->io_stats) {
764 kfree(server);
765 return NULL;
766 }
767
768 return server;
769 }
770
771 /*
772 * Free up a server record
773 */
774 void nfs_free_server(struct nfs_server *server)
775 {
776 dprintk("--> nfs_free_server()\n");
777
778 spin_lock(&nfs_client_lock);
779 list_del(&server->client_link);
780 list_del(&server->master_link);
781 spin_unlock(&nfs_client_lock);
782
783 if (server->destroy != NULL)
784 server->destroy(server);
785 if (!IS_ERR(server->client))
786 rpc_shutdown_client(server->client);
787
788 nfs_put_client(server->nfs_client);
789
790 nfs_free_iostats(server->io_stats);
791 kfree(server);
792 nfs_release_automount_timer();
793 dprintk("<-- nfs_free_server()\n");
794 }
795
796 /*
797 * Create a version 2 or 3 volume record
798 * - keyed on server and FSID
799 */
800 struct nfs_server *nfs_create_server(const struct nfs_mount_data *data,
801 struct nfs_fh *mntfh)
802 {
803 struct nfs_server *server;
804 struct nfs_fattr fattr;
805 int error;
806
807 server = nfs_alloc_server();
808 if (!server)
809 return ERR_PTR(-ENOMEM);
810
811 /* Get a client representation */
812 error = nfs_init_server(server, data);
813 if (error < 0)
814 goto error;
815
816 BUG_ON(!server->nfs_client);
817 BUG_ON(!server->nfs_client->rpc_ops);
818 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
819
820 /* Probe the root fh to retrieve its FSID */
821 error = nfs_probe_fsinfo(server, mntfh, &fattr);
822 if (error < 0)
823 goto error;
824 if (!(fattr.valid & NFS_ATTR_FATTR)) {
825 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
826 if (error < 0) {
827 dprintk("nfs_create_server: getattr error = %d\n", -error);
828 goto error;
829 }
830 }
831 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
832
833 dprintk("Server FSID: %llx:%llx\n",
834 (unsigned long long) server->fsid.major,
835 (unsigned long long) server->fsid.minor);
836
837 BUG_ON(!server->nfs_client);
838 BUG_ON(!server->nfs_client->rpc_ops);
839 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
840
841 spin_lock(&nfs_client_lock);
842 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
843 list_add_tail(&server->master_link, &nfs_volume_list);
844 spin_unlock(&nfs_client_lock);
845
846 server->mount_time = jiffies;
847 return server;
848
849 error:
850 nfs_free_server(server);
851 return ERR_PTR(error);
852 }
853
854 #ifdef CONFIG_NFS_V4
855 /*
856 * Initialise an NFS4 client record
857 */
858 static int nfs4_init_client(struct nfs_client *clp,
859 int proto, int timeo, int retrans,
860 const char *ip_addr,
861 rpc_authflavor_t authflavour)
862 {
863 int error;
864
865 if (clp->cl_cons_state == NFS_CS_READY) {
866 /* the client is initialised already */
867 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
868 return 0;
869 }
870
871 /* Check NFS protocol revision and initialize RPC op vector */
872 clp->rpc_ops = &nfs_v4_clientops;
873
874 error = nfs_create_rpc_client(clp, proto, timeo, retrans, authflavour,
875 RPC_CLNT_CREATE_DISCRTRY);
876 if (error < 0)
877 goto error;
878 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
879
880 error = nfs_idmap_new(clp);
881 if (error < 0) {
882 dprintk("%s: failed to create idmapper. Error = %d\n",
883 __FUNCTION__, error);
884 goto error;
885 }
886 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
887
888 nfs_mark_client_ready(clp, NFS_CS_READY);
889 return 0;
890
891 error:
892 nfs_mark_client_ready(clp, error);
893 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
894 return error;
895 }
896
897 /*
898 * Set up an NFS4 client
899 */
900 static int nfs4_set_client(struct nfs_server *server,
901 const char *hostname, const struct sockaddr_in *addr,
902 const char *ip_addr,
903 rpc_authflavor_t authflavour,
904 int proto, int timeo, int retrans)
905 {
906 struct nfs_client *clp;
907 int error;
908
909 dprintk("--> nfs4_set_client()\n");
910
911 /* Allocate or find a client reference we can use */
912 clp = nfs_get_client(hostname, addr, 4);
913 if (IS_ERR(clp)) {
914 error = PTR_ERR(clp);
915 goto error;
916 }
917 error = nfs4_init_client(clp, proto, timeo, retrans, ip_addr, authflavour);
918 if (error < 0)
919 goto error_put;
920
921 server->nfs_client = clp;
922 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
923 return 0;
924
925 error_put:
926 nfs_put_client(clp);
927 error:
928 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
929 return error;
930 }
931
932 /*
933 * Create a version 4 volume record
934 */
935 static int nfs4_init_server(struct nfs_server *server,
936 const struct nfs4_mount_data *data, rpc_authflavor_t authflavour)
937 {
938 int error;
939
940 dprintk("--> nfs4_init_server()\n");
941
942 /* Initialise the client representation from the mount data */
943 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
944 server->caps |= NFS_CAP_ATOMIC_OPEN;
945
946 if (data->rsize)
947 server->rsize = nfs_block_size(data->rsize, NULL);
948 if (data->wsize)
949 server->wsize = nfs_block_size(data->wsize, NULL);
950
951 server->acregmin = data->acregmin * HZ;
952 server->acregmax = data->acregmax * HZ;
953 server->acdirmin = data->acdirmin * HZ;
954 server->acdirmax = data->acdirmax * HZ;
955
956 error = nfs_init_server_rpcclient(server, authflavour);
957
958 /* Done */
959 dprintk("<-- nfs4_init_server() = %d\n", error);
960 return error;
961 }
962
963 /*
964 * Create a version 4 volume record
965 * - keyed on server and FSID
966 */
967 struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *data,
968 const char *hostname,
969 const struct sockaddr_in *addr,
970 const char *mntpath,
971 const char *ip_addr,
972 rpc_authflavor_t authflavour,
973 struct nfs_fh *mntfh)
974 {
975 struct nfs_fattr fattr;
976 struct nfs_server *server;
977 int error;
978
979 dprintk("--> nfs4_create_server()\n");
980
981 server = nfs_alloc_server();
982 if (!server)
983 return ERR_PTR(-ENOMEM);
984
985 /* Get a client record */
986 error = nfs4_set_client(server, hostname, addr, ip_addr, authflavour,
987 data->proto, data->timeo, data->retrans);
988 if (error < 0)
989 goto error;
990
991 /* set up the general RPC client */
992 error = nfs4_init_server(server, data, authflavour);
993 if (error < 0)
994 goto error;
995
996 BUG_ON(!server->nfs_client);
997 BUG_ON(!server->nfs_client->rpc_ops);
998 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
999
1000 /* Probe the root fh to retrieve its FSID */
1001 error = nfs4_path_walk(server, mntfh, mntpath);
1002 if (error < 0)
1003 goto error;
1004
1005 dprintk("Server FSID: %llx:%llx\n",
1006 (unsigned long long) server->fsid.major,
1007 (unsigned long long) server->fsid.minor);
1008 dprintk("Mount FH: %d\n", mntfh->size);
1009
1010 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1011 if (error < 0)
1012 goto error;
1013
1014 BUG_ON(!server->nfs_client);
1015 BUG_ON(!server->nfs_client->rpc_ops);
1016 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1017
1018 spin_lock(&nfs_client_lock);
1019 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1020 list_add_tail(&server->master_link, &nfs_volume_list);
1021 spin_unlock(&nfs_client_lock);
1022
1023 server->mount_time = jiffies;
1024 dprintk("<-- nfs4_create_server() = %p\n", server);
1025 return server;
1026
1027 error:
1028 nfs_free_server(server);
1029 dprintk("<-- nfs4_create_server() = error %d\n", error);
1030 return ERR_PTR(error);
1031 }
1032
1033 /*
1034 * Create an NFS4 referral server record
1035 */
1036 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1037 struct nfs_fh *mntfh)
1038 {
1039 struct nfs_client *parent_client;
1040 struct nfs_server *server, *parent_server;
1041 struct nfs_fattr fattr;
1042 int error;
1043
1044 dprintk("--> nfs4_create_referral_server()\n");
1045
1046 server = nfs_alloc_server();
1047 if (!server)
1048 return ERR_PTR(-ENOMEM);
1049
1050 parent_server = NFS_SB(data->sb);
1051 parent_client = parent_server->nfs_client;
1052
1053 /* Get a client representation.
1054 * Note: NFSv4 always uses TCP, */
1055 error = nfs4_set_client(server, data->hostname, data->addr,
1056 parent_client->cl_ipaddr,
1057 data->authflavor,
1058 parent_server->client->cl_xprt->prot,
1059 parent_client->retrans_timeo,
1060 parent_client->retrans_count);
1061 if (error < 0)
1062 goto error;
1063
1064 /* Initialise the client representation from the parent server */
1065 nfs_server_copy_userdata(server, parent_server);
1066 server->caps |= NFS_CAP_ATOMIC_OPEN;
1067
1068 error = nfs_init_server_rpcclient(server, data->authflavor);
1069 if (error < 0)
1070 goto error;
1071
1072 BUG_ON(!server->nfs_client);
1073 BUG_ON(!server->nfs_client->rpc_ops);
1074 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1075
1076 /* Probe the root fh to retrieve its FSID and filehandle */
1077 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1078 if (error < 0)
1079 goto error;
1080
1081 /* probe the filesystem info for this server filesystem */
1082 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1083 if (error < 0)
1084 goto error;
1085
1086 dprintk("Referral FSID: %llx:%llx\n",
1087 (unsigned long long) server->fsid.major,
1088 (unsigned long long) server->fsid.minor);
1089
1090 spin_lock(&nfs_client_lock);
1091 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1092 list_add_tail(&server->master_link, &nfs_volume_list);
1093 spin_unlock(&nfs_client_lock);
1094
1095 server->mount_time = jiffies;
1096
1097 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1098 return server;
1099
1100 error:
1101 nfs_free_server(server);
1102 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1103 return ERR_PTR(error);
1104 }
1105
1106 #endif /* CONFIG_NFS_V4 */
1107
1108 /*
1109 * Clone an NFS2, NFS3 or NFS4 server record
1110 */
1111 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1112 struct nfs_fh *fh,
1113 struct nfs_fattr *fattr)
1114 {
1115 struct nfs_server *server;
1116 struct nfs_fattr fattr_fsinfo;
1117 int error;
1118
1119 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1120 (unsigned long long) fattr->fsid.major,
1121 (unsigned long long) fattr->fsid.minor);
1122
1123 server = nfs_alloc_server();
1124 if (!server)
1125 return ERR_PTR(-ENOMEM);
1126
1127 /* Copy data from the source */
1128 server->nfs_client = source->nfs_client;
1129 atomic_inc(&server->nfs_client->cl_count);
1130 nfs_server_copy_userdata(server, source);
1131
1132 server->fsid = fattr->fsid;
1133
1134 error = nfs_init_server_rpcclient(server, source->client->cl_auth->au_flavor);
1135 if (error < 0)
1136 goto out_free_server;
1137 if (!IS_ERR(source->client_acl))
1138 nfs_init_server_aclclient(server);
1139
1140 /* probe the filesystem info for this server filesystem */
1141 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1142 if (error < 0)
1143 goto out_free_server;
1144
1145 dprintk("Cloned FSID: %llx:%llx\n",
1146 (unsigned long long) server->fsid.major,
1147 (unsigned long long) server->fsid.minor);
1148
1149 error = nfs_start_lockd(server);
1150 if (error < 0)
1151 goto out_free_server;
1152
1153 spin_lock(&nfs_client_lock);
1154 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1155 list_add_tail(&server->master_link, &nfs_volume_list);
1156 spin_unlock(&nfs_client_lock);
1157
1158 server->mount_time = jiffies;
1159
1160 dprintk("<-- nfs_clone_server() = %p\n", server);
1161 return server;
1162
1163 out_free_server:
1164 nfs_free_server(server);
1165 dprintk("<-- nfs_clone_server() = error %d\n", error);
1166 return ERR_PTR(error);
1167 }
1168
1169 #ifdef CONFIG_PROC_FS
1170 static struct proc_dir_entry *proc_fs_nfs;
1171
1172 static int nfs_server_list_open(struct inode *inode, struct file *file);
1173 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1174 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1175 static void nfs_server_list_stop(struct seq_file *p, void *v);
1176 static int nfs_server_list_show(struct seq_file *m, void *v);
1177
1178 static struct seq_operations nfs_server_list_ops = {
1179 .start = nfs_server_list_start,
1180 .next = nfs_server_list_next,
1181 .stop = nfs_server_list_stop,
1182 .show = nfs_server_list_show,
1183 };
1184
1185 static const struct file_operations nfs_server_list_fops = {
1186 .open = nfs_server_list_open,
1187 .read = seq_read,
1188 .llseek = seq_lseek,
1189 .release = seq_release,
1190 };
1191
1192 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1193 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1194 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1195 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1196 static int nfs_volume_list_show(struct seq_file *m, void *v);
1197
1198 static struct seq_operations nfs_volume_list_ops = {
1199 .start = nfs_volume_list_start,
1200 .next = nfs_volume_list_next,
1201 .stop = nfs_volume_list_stop,
1202 .show = nfs_volume_list_show,
1203 };
1204
1205 static const struct file_operations nfs_volume_list_fops = {
1206 .open = nfs_volume_list_open,
1207 .read = seq_read,
1208 .llseek = seq_lseek,
1209 .release = seq_release,
1210 };
1211
1212 /*
1213 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1214 * we're dealing
1215 */
1216 static int nfs_server_list_open(struct inode *inode, struct file *file)
1217 {
1218 struct seq_file *m;
1219 int ret;
1220
1221 ret = seq_open(file, &nfs_server_list_ops);
1222 if (ret < 0)
1223 return ret;
1224
1225 m = file->private_data;
1226 m->private = PDE(inode)->data;
1227
1228 return 0;
1229 }
1230
1231 /*
1232 * set up the iterator to start reading from the server list and return the first item
1233 */
1234 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1235 {
1236 struct list_head *_p;
1237 loff_t pos = *_pos;
1238
1239 /* lock the list against modification */
1240 spin_lock(&nfs_client_lock);
1241
1242 /* allow for the header line */
1243 if (!pos)
1244 return SEQ_START_TOKEN;
1245 pos--;
1246
1247 /* find the n'th element in the list */
1248 list_for_each(_p, &nfs_client_list)
1249 if (!pos--)
1250 break;
1251
1252 return _p != &nfs_client_list ? _p : NULL;
1253 }
1254
1255 /*
1256 * move to next server
1257 */
1258 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1259 {
1260 struct list_head *_p;
1261
1262 (*pos)++;
1263
1264 _p = v;
1265 _p = (v == SEQ_START_TOKEN) ? nfs_client_list.next : _p->next;
1266
1267 return _p != &nfs_client_list ? _p : NULL;
1268 }
1269
1270 /*
1271 * clean up after reading from the transports list
1272 */
1273 static void nfs_server_list_stop(struct seq_file *p, void *v)
1274 {
1275 spin_unlock(&nfs_client_lock);
1276 }
1277
1278 /*
1279 * display a header line followed by a load of call lines
1280 */
1281 static int nfs_server_list_show(struct seq_file *m, void *v)
1282 {
1283 struct nfs_client *clp;
1284
1285 /* display header on line 1 */
1286 if (v == SEQ_START_TOKEN) {
1287 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1288 return 0;
1289 }
1290
1291 /* display one transport per line on subsequent lines */
1292 clp = list_entry(v, struct nfs_client, cl_share_link);
1293
1294 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %3d %s\n",
1295 clp->cl_nfsversion,
1296 NIPQUAD(clp->cl_addr.sin_addr),
1297 ntohs(clp->cl_addr.sin_port),
1298 atomic_read(&clp->cl_count),
1299 clp->cl_hostname);
1300
1301 return 0;
1302 }
1303
1304 /*
1305 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1306 */
1307 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1308 {
1309 struct seq_file *m;
1310 int ret;
1311
1312 ret = seq_open(file, &nfs_volume_list_ops);
1313 if (ret < 0)
1314 return ret;
1315
1316 m = file->private_data;
1317 m->private = PDE(inode)->data;
1318
1319 return 0;
1320 }
1321
1322 /*
1323 * set up the iterator to start reading from the volume list and return the first item
1324 */
1325 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1326 {
1327 struct list_head *_p;
1328 loff_t pos = *_pos;
1329
1330 /* lock the list against modification */
1331 spin_lock(&nfs_client_lock);
1332
1333 /* allow for the header line */
1334 if (!pos)
1335 return SEQ_START_TOKEN;
1336 pos--;
1337
1338 /* find the n'th element in the list */
1339 list_for_each(_p, &nfs_volume_list)
1340 if (!pos--)
1341 break;
1342
1343 return _p != &nfs_volume_list ? _p : NULL;
1344 }
1345
1346 /*
1347 * move to next volume
1348 */
1349 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1350 {
1351 struct list_head *_p;
1352
1353 (*pos)++;
1354
1355 _p = v;
1356 _p = (v == SEQ_START_TOKEN) ? nfs_volume_list.next : _p->next;
1357
1358 return _p != &nfs_volume_list ? _p : NULL;
1359 }
1360
1361 /*
1362 * clean up after reading from the transports list
1363 */
1364 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1365 {
1366 spin_unlock(&nfs_client_lock);
1367 }
1368
1369 /*
1370 * display a header line followed by a load of call lines
1371 */
1372 static int nfs_volume_list_show(struct seq_file *m, void *v)
1373 {
1374 struct nfs_server *server;
1375 struct nfs_client *clp;
1376 char dev[8], fsid[17];
1377
1378 /* display header on line 1 */
1379 if (v == SEQ_START_TOKEN) {
1380 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1381 return 0;
1382 }
1383 /* display one transport per line on subsequent lines */
1384 server = list_entry(v, struct nfs_server, master_link);
1385 clp = server->nfs_client;
1386
1387 snprintf(dev, 8, "%u:%u",
1388 MAJOR(server->s_dev), MINOR(server->s_dev));
1389
1390 snprintf(fsid, 17, "%llx:%llx",
1391 (unsigned long long) server->fsid.major,
1392 (unsigned long long) server->fsid.minor);
1393
1394 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %-7s %-17s\n",
1395 clp->cl_nfsversion,
1396 NIPQUAD(clp->cl_addr.sin_addr),
1397 ntohs(clp->cl_addr.sin_port),
1398 dev,
1399 fsid);
1400
1401 return 0;
1402 }
1403
1404 /*
1405 * initialise the /proc/fs/nfsfs/ directory
1406 */
1407 int __init nfs_fs_proc_init(void)
1408 {
1409 struct proc_dir_entry *p;
1410
1411 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
1412 if (!proc_fs_nfs)
1413 goto error_0;
1414
1415 proc_fs_nfs->owner = THIS_MODULE;
1416
1417 /* a file of servers with which we're dealing */
1418 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs);
1419 if (!p)
1420 goto error_1;
1421
1422 p->proc_fops = &nfs_server_list_fops;
1423 p->owner = THIS_MODULE;
1424
1425 /* a file of volumes that we have mounted */
1426 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
1427 if (!p)
1428 goto error_2;
1429
1430 p->proc_fops = &nfs_volume_list_fops;
1431 p->owner = THIS_MODULE;
1432 return 0;
1433
1434 error_2:
1435 remove_proc_entry("servers", proc_fs_nfs);
1436 error_1:
1437 remove_proc_entry("nfsfs", proc_root_fs);
1438 error_0:
1439 return -ENOMEM;
1440 }
1441
1442 /*
1443 * clean up the /proc/fs/nfsfs/ directory
1444 */
1445 void nfs_fs_proc_exit(void)
1446 {
1447 remove_proc_entry("volumes", proc_fs_nfs);
1448 remove_proc_entry("servers", proc_fs_nfs);
1449 remove_proc_entry("nfsfs", proc_root_fs);
1450 }
1451
1452 #endif /* CONFIG_PROC_FS */
Stable & featurefull patchset based on Linus's git branch