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NFS: use in-kernel mount argument structure for nfsv[23] mounts
[linux.git] / fs / nfs / client.c
CommitLineData
24c8dbbb
DH		 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 ([email protected])
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
24c8dbbb
DH		 13#include <linux/module.h>
14#include <linux/init.h>
e8edc6e0 15#include <linux/sched.h>
24c8dbbb
DH		 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>
24c8dbbb
DH		 30#include <linux/seq_file.h>
31#include <linux/mount.h>
32#include <linux/nfs_idmap.h>
33#include <linux/vfs.h>
34#include <linux/inet.h>
35#include <linux/nfs_xdr.h>
36
37#include <asm/system.h>
38
39#include "nfs4_fs.h"
40#include "callback.h"
41#include "delegation.h"
42#include "iostat.h"
43#include "internal.h"
44
45#define NFSDBG_FACILITY NFSDBG_CLIENT
46
47static DEFINE_SPINLOCK(nfs_client_lock);
48static LIST_HEAD(nfs_client_list);
54ceac45 49static LIST_HEAD(nfs_volume_list);
24c8dbbb
DH		 50static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
51
5006a76c
DH		 52/*
53 * RPC cruft for NFS
54 */
55static struct rpc_version *nfs_version[5] = {
56 [2] = &nfs_version2,
57#ifdef CONFIG_NFS_V3
58 [3] = &nfs_version3,
59#endif
60#ifdef CONFIG_NFS_V4
61 [4] = &nfs_version4,
62#endif
63};
64
65struct rpc_program nfs_program = {
66 .name = "nfs",
67 .number = NFS_PROGRAM,
68 .nrvers = ARRAY_SIZE(nfs_version),
69 .version = nfs_version,
70 .stats = &nfs_rpcstat,
71 .pipe_dir_name = "/nfs",
72};
73
74struct rpc_stat nfs_rpcstat = {
75 .program = &nfs_program
76};
77
78
79#ifdef CONFIG_NFS_V3_ACL
80static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
81static struct rpc_version * nfsacl_version[] = {
82 [3] = &nfsacl_version3,
83};
84
85struct rpc_program nfsacl_program = {
86 .name = "nfsacl",
87 .number = NFS_ACL_PROGRAM,
88 .nrvers = ARRAY_SIZE(nfsacl_version),
89 .version = nfsacl_version,
90 .stats = &nfsacl_rpcstat,
91};
92#endif /* CONFIG_NFS_V3_ACL */
93
24c8dbbb
DH		 94/*
95 * Allocate a shared client record
96 *
97 * Since these are allocated/deallocated very rarely, we don't
98 * bother putting them in a slab cache...
99 */
100static struct nfs_client *nfs_alloc_client(const char *hostname,
101 const struct sockaddr_in *addr,
102 int nfsversion)
103{
104 struct nfs_client *clp;
24c8dbbb
DH		 105
106 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
107 goto error_0;
108
24c8dbbb
DH		 109 if (nfsversion == 4) {
110 if (nfs_callback_up() < 0)
111 goto error_2;
112 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
113 }
114
115 atomic_set(&clp->cl_count, 1);
116 clp->cl_cons_state = NFS_CS_INITING;
117
118 clp->cl_nfsversion = nfsversion;
119 memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr));
120
121 if (hostname) {
122 clp->cl_hostname = kstrdup(hostname, GFP_KERNEL);
123 if (!clp->cl_hostname)
124 goto error_3;
125 }
126
127 INIT_LIST_HEAD(&clp->cl_superblocks);
128 clp->cl_rpcclient = ERR_PTR(-EINVAL);
129
130#ifdef CONFIG_NFS_V4
131 init_rwsem(&clp->cl_sem);
132 INIT_LIST_HEAD(&clp->cl_delegations);
24c8dbbb 133 spin_lock_init(&clp->cl_lock);
65f27f38 134 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
24c8dbbb
DH		 135 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
136 clp->cl_boot_time = CURRENT_TIME;
137 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
138#endif
139
140 return clp;
141
142error_3:
9c5bf38d
TM		 143 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
144 nfs_callback_down();
24c8dbbb 145error_2:
24c8dbbb
DH		 146 kfree(clp);
147error_0:
148 return NULL;
149}
150
5dd3177a
TM		 151static void nfs4_shutdown_client(struct nfs_client *clp)
152{
153#ifdef CONFIG_NFS_V4
154 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
155 nfs4_kill_renewd(clp);
9f958ab8 156 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
5dd3177a
TM		 157 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
158 nfs_idmap_delete(clp);
159#endif
160}
161
24c8dbbb
DH		 162/*
163 * Destroy a shared client record
164 */
165static void nfs_free_client(struct nfs_client *clp)
166{
167 dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion);
168
5dd3177a 169 nfs4_shutdown_client(clp);
24c8dbbb
DH		 170
171 /* -EIO all pending I/O */
172 if (!IS_ERR(clp->cl_rpcclient))
173 rpc_shutdown_client(clp->cl_rpcclient);
174
175 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
176 nfs_callback_down();
177
24c8dbbb
DH		 178 kfree(clp->cl_hostname);
179 kfree(clp);
180
181 dprintk("<-- nfs_free_client()\n");
182}
183
184/*
185 * Release a reference to a shared client record
186 */
187void nfs_put_client(struct nfs_client *clp)
188{
27ba8512
DH		 189 if (!clp)
190 return;
191
24c8dbbb
DH		 192 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
193
194 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
195 list_del(&clp->cl_share_link);
196 spin_unlock(&nfs_client_lock);
197
198 BUG_ON(!list_empty(&clp->cl_superblocks));
199
200 nfs_free_client(clp);
201 }
202}
203
204/*
205 * Find a client by address
206 * - caller must hold nfs_client_lock
207 */
13bbc06a 208static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion, int match_port)
24c8dbbb
DH		 209{
210 struct nfs_client *clp;
211
212 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
13bbc06a
TM		 213 /* Don't match clients that failed to initialise properly */
214 if (clp->cl_cons_state < 0)
215 continue;
216
24c8dbbb
DH		 217 /* Different NFS versions cannot share the same nfs_client */
218 if (clp->cl_nfsversion != nfsversion)
219 continue;
220
221 if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr,
222 sizeof(clp->cl_addr.sin_addr)) != 0)
223 continue;
224
13bbc06a 225 if (!match_port || clp->cl_addr.sin_port == addr->sin_port)
24c8dbbb
DH		 226 goto found;
227 }
228
229 return NULL;
230
231found:
232 atomic_inc(&clp->cl_count);
233 return clp;
234}
235
236/*
237 * Find a client by IP address and protocol version
238 * - returns NULL if no such client
239 */
240struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
241{
242 struct nfs_client *clp;
243
244 spin_lock(&nfs_client_lock);
13bbc06a 245 clp = __nfs_find_client(addr, nfsversion, 0);
24c8dbbb 246 spin_unlock(&nfs_client_lock);
13bbc06a
TM		 247 if (clp != NULL && clp->cl_cons_state != NFS_CS_READY) {
248 nfs_put_client(clp);
249 clp = NULL;
250 }
24c8dbbb
DH		 251 return clp;
252}
253
254/*
255 * Look up a client by IP address and protocol version
256 * - creates a new record if one doesn't yet exist
257 */
54ceac45
DH		 258static struct nfs_client *nfs_get_client(const char *hostname,
259 const struct sockaddr_in *addr,
260 int nfsversion)
24c8dbbb
DH		 261{
262 struct nfs_client *clp, *new = NULL;
263 int error;
264
265 dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n",
266 hostname ?: "", NIPQUAD(addr->sin_addr),
267 addr->sin_port, nfsversion);
268
269 /* see if the client already exists */
270 do {
271 spin_lock(&nfs_client_lock);
272
13bbc06a 273 clp = __nfs_find_client(addr, nfsversion, 1);
24c8dbbb
DH		 274 if (clp)
275 goto found_client;
276 if (new)
277 goto install_client;
278
279 spin_unlock(&nfs_client_lock);
280
281 new = nfs_alloc_client(hostname, addr, nfsversion);
282 } while (new);
283
284 return ERR_PTR(-ENOMEM);
285
286 /* install a new client and return with it unready */
287install_client:
288 clp = new;
289 list_add(&clp->cl_share_link, &nfs_client_list);
290 spin_unlock(&nfs_client_lock);
291 dprintk("--> nfs_get_client() = %p [new]\n", clp);
292 return clp;
293
294 /* found an existing client
295 * - make sure it's ready before returning
296 */
297found_client:
298 spin_unlock(&nfs_client_lock);
299
300 if (new)
301 nfs_free_client(new);
302
83250493 303 error = wait_event_interruptible(nfs_client_active_wq,
0bae89ec
TM		 304 clp->cl_cons_state != NFS_CS_INITING);
305 if (error < 0) {
306 nfs_put_client(clp);
307 return ERR_PTR(-ERESTARTSYS);
24c8dbbb
DH		 308 }
309
310 if (clp->cl_cons_state < NFS_CS_READY) {
311 error = clp->cl_cons_state;
312 nfs_put_client(clp);
313 return ERR_PTR(error);
314 }
315
54ceac45
DH		 316 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
317
24c8dbbb
DH		 318 dprintk("--> nfs_get_client() = %p [share]\n", clp);
319 return clp;
320}
321
322/*
323 * Mark a server as ready or failed
324 */
54ceac45 325static void nfs_mark_client_ready(struct nfs_client *clp, int state)
24c8dbbb
DH		 326{
327 clp->cl_cons_state = state;
328 wake_up_all(&nfs_client_active_wq);
329}
5006a76c
DH		 330
331/*
332 * Initialise the timeout values for a connection
333 */
334static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
335 unsigned int timeo, unsigned int retrans)
336{
337 to->to_initval = timeo * HZ / 10;
338 to->to_retries = retrans;
339 if (!to->to_retries)
340 to->to_retries = 2;
341
342 switch (proto) {
343 case IPPROTO_TCP:
344 if (!to->to_initval)
345 to->to_initval = 60 * HZ;
346 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
347 to->to_initval = NFS_MAX_TCP_TIMEOUT;
348 to->to_increment = to->to_initval;
349 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
350 to->to_exponential = 0;
351 break;
352 case IPPROTO_UDP:
353 default:
354 if (!to->to_initval)
355 to->to_initval = 11 * HZ / 10;
356 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
357 to->to_initval = NFS_MAX_UDP_TIMEOUT;
358 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
359 to->to_exponential = 1;
360 break;
361 }
362}
363
364/*
365 * Create an RPC client handle
366 */
54ceac45
DH		 367static int nfs_create_rpc_client(struct nfs_client *clp, int proto,
368 unsigned int timeo,
369 unsigned int retrans,
43d78ef2
CL		 370 rpc_authflavor_t flavor,
371 int flags)
5006a76c
DH		 372{
373 struct rpc_timeout timeparms;
5006a76c 374 struct rpc_clnt *clnt = NULL;
41877d20
CL		 375 struct rpc_create_args args = {
376 .protocol = proto,
377 .address = (struct sockaddr *)&clp->cl_addr,
378 .addrsize = sizeof(clp->cl_addr),
379 .timeout = &timeparms,
380 .servername = clp->cl_hostname,
381 .program = &nfs_program,
382 .version = clp->rpc_ops->version,
383 .authflavor = flavor,
43d78ef2 384 .flags = flags,
41877d20 385 };
5006a76c
DH		 386
387 if (!IS_ERR(clp->cl_rpcclient))
388 return 0;
389
390 nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
391 clp->retrans_timeo = timeparms.to_initval;
392 clp->retrans_count = timeparms.to_retries;
393
41877d20 394 clnt = rpc_create(&args);
5006a76c
DH		 395 if (IS_ERR(clnt)) {
396 dprintk("%s: cannot create RPC client. Error = %ld\n",
397 __FUNCTION__, PTR_ERR(clnt));
398 return PTR_ERR(clnt);
399 }
400
5006a76c
DH		 401 clp->cl_rpcclient = clnt;
402 return 0;
403}
54ceac45
DH		 404
405/*
406 * Version 2 or 3 client destruction
407 */
408static void nfs_destroy_server(struct nfs_server *server)
409{
410 if (!IS_ERR(server->client_acl))
411 rpc_shutdown_client(server->client_acl);
412
413 if (!(server->flags & NFS_MOUNT_NONLM))
414 lockd_down(); /* release rpc.lockd */
415}
416
417/*
418 * Version 2 or 3 lockd setup
419 */
420static int nfs_start_lockd(struct nfs_server *server)
421{
422 int error = 0;
423
424 if (server->nfs_client->cl_nfsversion > 3)
425 goto out;
426 if (server->flags & NFS_MOUNT_NONLM)
427 goto out;
24e36663
N		 428 error = lockd_up((server->flags & NFS_MOUNT_TCP) ?
429 IPPROTO_TCP : IPPROTO_UDP);
54ceac45
DH		 430 if (error < 0)
431 server->flags |= NFS_MOUNT_NONLM;
432 else
433 server->destroy = nfs_destroy_server;
434out:
435 return error;
436}
437
438/*
439 * Initialise an NFSv3 ACL client connection
440 */
441#ifdef CONFIG_NFS_V3_ACL
442static void nfs_init_server_aclclient(struct nfs_server *server)
443{
444 if (server->nfs_client->cl_nfsversion != 3)
445 goto out_noacl;
446 if (server->flags & NFS_MOUNT_NOACL)
447 goto out_noacl;
448
449 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
450 if (IS_ERR(server->client_acl))
451 goto out_noacl;
452
453 /* No errors! Assume that Sun nfsacls are supported */
454 server->caps |= NFS_CAP_ACLS;
455 return;
456
457out_noacl:
458 server->caps &= ~NFS_CAP_ACLS;
459}
460#else
461static inline void nfs_init_server_aclclient(struct nfs_server *server)
462{
463 server->flags &= ~NFS_MOUNT_NOACL;
464 server->caps &= ~NFS_CAP_ACLS;
465}
466#endif
467
468/*
469 * Create a general RPC client
470 */
471static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour)
472{
473 struct nfs_client *clp = server->nfs_client;
474
475 server->client = rpc_clone_client(clp->cl_rpcclient);
476 if (IS_ERR(server->client)) {
477 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
478 return PTR_ERR(server->client);
479 }
480
481 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
482 struct rpc_auth *auth;
483
484 auth = rpcauth_create(pseudoflavour, server->client);
485 if (IS_ERR(auth)) {
486 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
487 return PTR_ERR(auth);
488 }
489 }
490 server->client->cl_softrtry = 0;
491 if (server->flags & NFS_MOUNT_SOFT)
492 server->client->cl_softrtry = 1;
493
494 server->client->cl_intr = 0;
495 if (server->flags & NFS4_MOUNT_INTR)
496 server->client->cl_intr = 1;
497
498 return 0;
499}
500
501/*
502 * Initialise an NFS2 or NFS3 client
503 */
2283f8d6
TT		 504static int nfs_init_client(struct nfs_client *clp,
505 const struct nfs_parsed_mount_data *data)
54ceac45 506{
54ceac45
DH		 507 int error;
508
509 if (clp->cl_cons_state == NFS_CS_READY) {
510 /* the client is already initialised */
511 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
512 return 0;
513 }
514
515 /* Check NFS protocol revision and initialize RPC op vector */
516 clp->rpc_ops = &nfs_v2_clientops;
517#ifdef CONFIG_NFS_V3
518 if (clp->cl_nfsversion == 3)
519 clp->rpc_ops = &nfs_v3_clientops;
520#endif
521 /*
522 * Create a client RPC handle for doing FSSTAT with UNIX auth only
523 * - RFC 2623, sec 2.3.2
524 */
2283f8d6
TT		 525 error = nfs_create_rpc_client(clp, data->nfs_server.protocol,
526 data->timeo, data->retrans, RPC_AUTH_UNIX, 0);
54ceac45
DH		 527 if (error < 0)
528 goto error;
529 nfs_mark_client_ready(clp, NFS_CS_READY);
530 return 0;
531
532error:
533 nfs_mark_client_ready(clp, error);
534 dprintk("<-- nfs_init_client() = xerror %d\n", error);
535 return error;
536}
537
538/*
539 * Create a version 2 or 3 client
540 */
2283f8d6
TT		 541static int nfs_init_server(struct nfs_server *server,
542 const struct nfs_parsed_mount_data *data)
54ceac45
DH		 543{
544 struct nfs_client *clp;
545 int error, nfsvers = 2;
546
547 dprintk("--> nfs_init_server()\n");
548
549#ifdef CONFIG_NFS_V3
550 if (data->flags & NFS_MOUNT_VER3)
551 nfsvers = 3;
552#endif
553
554 /* Allocate or find a client reference we can use */
2283f8d6
TT		 555 clp = nfs_get_client(data->nfs_server.hostname,
556 &data->nfs_server.address, nfsvers);
54ceac45
DH		 557 if (IS_ERR(clp)) {
558 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
559 return PTR_ERR(clp);
560 }
561
562 error = nfs_init_client(clp, data);
563 if (error < 0)
564 goto error;
565
566 server->nfs_client = clp;
567
568 /* Initialise the client representation from the mount data */
569 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
570
571 if (data->rsize)
572 server->rsize = nfs_block_size(data->rsize, NULL);
573 if (data->wsize)
574 server->wsize = nfs_block_size(data->wsize, NULL);
575
576 server->acregmin = data->acregmin * HZ;
577 server->acregmax = data->acregmax * HZ;
578 server->acdirmin = data->acdirmin * HZ;
579 server->acdirmax = data->acdirmax * HZ;
580
581 /* Start lockd here, before we might error out */
582 error = nfs_start_lockd(server);
583 if (error < 0)
584 goto error;
585
2283f8d6 586 error = nfs_init_server_rpcclient(server, data->auth_flavors[0]);
54ceac45
DH		 587 if (error < 0)
588 goto error;
589
590 server->namelen = data->namlen;
591 /* Create a client RPC handle for the NFSv3 ACL management interface */
592 nfs_init_server_aclclient(server);
54ceac45
DH		 593 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
594 return 0;
595
596error:
597 server->nfs_client = NULL;
598 nfs_put_client(clp);
599 dprintk("<-- nfs_init_server() = xerror %d\n", error);
600 return error;
601}
602
603/*
604 * Load up the server record from information gained in an fsinfo record
605 */
606static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
607{
608 unsigned long max_rpc_payload;
609
610 /* Work out a lot of parameters */
611 if (server->rsize == 0)
612 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
613 if (server->wsize == 0)
614 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
615
616 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
617 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
618 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
619 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
620
621 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
622 if (server->rsize > max_rpc_payload)
623 server->rsize = max_rpc_payload;
624 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
625 server->rsize = NFS_MAX_FILE_IO_SIZE;
626 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
627 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
628
629 if (server->wsize > max_rpc_payload)
630 server->wsize = max_rpc_payload;
631 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
632 server->wsize = NFS_MAX_FILE_IO_SIZE;
633 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
634 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
635
636 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
637 if (server->dtsize > PAGE_CACHE_SIZE)
638 server->dtsize = PAGE_CACHE_SIZE;
639 if (server->dtsize > server->rsize)
640 server->dtsize = server->rsize;
641
642 if (server->flags & NFS_MOUNT_NOAC) {
643 server->acregmin = server->acregmax = 0;
644 server->acdirmin = server->acdirmax = 0;
645 }
646
647 server->maxfilesize = fsinfo->maxfilesize;
648
649 /* We're airborne Set socket buffersize */
650 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
651}
652
653/*
654 * Probe filesystem information, including the FSID on v2/v3
655 */
656static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
657{
658 struct nfs_fsinfo fsinfo;
659 struct nfs_client *clp = server->nfs_client;
660 int error;
661
662 dprintk("--> nfs_probe_fsinfo()\n");
663
664 if (clp->rpc_ops->set_capabilities != NULL) {
665 error = clp->rpc_ops->set_capabilities(server, mntfh);
666 if (error < 0)
667 goto out_error;
668 }
669
670 fsinfo.fattr = fattr;
671 nfs_fattr_init(fattr);
672 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
673 if (error < 0)
674 goto out_error;
675
676 nfs_server_set_fsinfo(server, &fsinfo);
677
678 /* Get some general file system info */
679 if (server->namelen == 0) {
680 struct nfs_pathconf pathinfo;
681
682 pathinfo.fattr = fattr;
683 nfs_fattr_init(fattr);
684
685 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
686 server->namelen = pathinfo.max_namelen;
687 }
688
689 dprintk("<-- nfs_probe_fsinfo() = 0\n");
690 return 0;
691
692out_error:
693 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
694 return error;
695}
696
697/*
698 * Copy useful information when duplicating a server record
699 */
700static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
701{
702 target->flags = source->flags;
703 target->acregmin = source->acregmin;
704 target->acregmax = source->acregmax;
705 target->acdirmin = source->acdirmin;
706 target->acdirmax = source->acdirmax;
707 target->caps = source->caps;
708}
709
710/*
711 * Allocate and initialise a server record
712 */
713static struct nfs_server *nfs_alloc_server(void)
714{
715 struct nfs_server *server;
716
717 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
718 if (!server)
719 return NULL;
720
721 server->client = server->client_acl = ERR_PTR(-EINVAL);
722
723 /* Zero out the NFS state stuff */
724 INIT_LIST_HEAD(&server->client_link);
725 INIT_LIST_HEAD(&server->master_link);
726
727 server->io_stats = nfs_alloc_iostats();
728 if (!server->io_stats) {
729 kfree(server);
730 return NULL;
731 }
732
733 return server;
734}
735
736/*
737 * Free up a server record
738 */
739void nfs_free_server(struct nfs_server *server)
740{
741 dprintk("--> nfs_free_server()\n");
742
743 spin_lock(&nfs_client_lock);
744 list_del(&server->client_link);
745 list_del(&server->master_link);
746 spin_unlock(&nfs_client_lock);
747
748 if (server->destroy != NULL)
749 server->destroy(server);
750 if (!IS_ERR(server->client))
751 rpc_shutdown_client(server->client);
752
753 nfs_put_client(server->nfs_client);
754
755 nfs_free_iostats(server->io_stats);
756 kfree(server);
757 nfs_release_automount_timer();
758 dprintk("<-- nfs_free_server()\n");
759}
760
761/*
762 * Create a version 2 or 3 volume record
763 * - keyed on server and FSID
764 */
2283f8d6 765struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
54ceac45
DH		 766 struct nfs_fh *mntfh)
767{
768 struct nfs_server *server;
769 struct nfs_fattr fattr;
770 int error;
771
772 server = nfs_alloc_server();
773 if (!server)
774 return ERR_PTR(-ENOMEM);
775
776 /* Get a client representation */
777 error = nfs_init_server(server, data);
778 if (error < 0)
779 goto error;
780
781 BUG_ON(!server->nfs_client);
782 BUG_ON(!server->nfs_client->rpc_ops);
783 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
784
785 /* Probe the root fh to retrieve its FSID */
786 error = nfs_probe_fsinfo(server, mntfh, &fattr);
787 if (error < 0)
788 goto error;
54af3bb5
TM		 789 if (server->nfs_client->rpc_ops->version == 3) {
790 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
791 server->namelen = NFS3_MAXNAMLEN;
792 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
793 server->caps |= NFS_CAP_READDIRPLUS;
794 } else {
795 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
796 server->namelen = NFS2_MAXNAMLEN;
797 }
798
54ceac45
DH		 799 if (!(fattr.valid & NFS_ATTR_FATTR)) {
800 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
801 if (error < 0) {
802 dprintk("nfs_create_server: getattr error = %d\n", -error);
803 goto error;
804 }
805 }
806 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
807
6daabf1b
DH		 808 dprintk("Server FSID: %llx:%llx\n",
809 (unsigned long long) server->fsid.major,
810 (unsigned long long) server->fsid.minor);
54ceac45
DH		 811
812 BUG_ON(!server->nfs_client);
813 BUG_ON(!server->nfs_client->rpc_ops);
814 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
815
816 spin_lock(&nfs_client_lock);
817 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
818 list_add_tail(&server->master_link, &nfs_volume_list);
819 spin_unlock(&nfs_client_lock);
820
821 server->mount_time = jiffies;
822 return server;
823
824error:
825 nfs_free_server(server);
826 return ERR_PTR(error);
827}
828
829#ifdef CONFIG_NFS_V4
830/*
831 * Initialise an NFS4 client record
832 */
833static int nfs4_init_client(struct nfs_client *clp,
834 int proto, int timeo, int retrans,
7d9ac06f 835 const char *ip_addr,
54ceac45
DH		 836 rpc_authflavor_t authflavour)
837{
838 int error;
839
840 if (clp->cl_cons_state == NFS_CS_READY) {
841 /* the client is initialised already */
842 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
843 return 0;
844 }
845
846 /* Check NFS protocol revision and initialize RPC op vector */
847 clp->rpc_ops = &nfs_v4_clientops;
848
43d78ef2
CL		 849 error = nfs_create_rpc_client(clp, proto, timeo, retrans, authflavour,
850 RPC_CLNT_CREATE_DISCRTRY);
54ceac45
DH		 851 if (error < 0)
852 goto error;
7d9ac06f 853 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
54ceac45
DH		 854
855 error = nfs_idmap_new(clp);
856 if (error < 0) {
857 dprintk("%s: failed to create idmapper. Error = %d\n",
858 __FUNCTION__, error);
54ceac45
DH		 859 goto error;
860 }
9c5bf38d 861 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
54ceac45
DH		 862
863 nfs_mark_client_ready(clp, NFS_CS_READY);
864 return 0;
865
866error:
867 nfs_mark_client_ready(clp, error);
868 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
869 return error;
870}
871
872/*
873 * Set up an NFS4 client
874 */
875static int nfs4_set_client(struct nfs_server *server,
876 const char *hostname, const struct sockaddr_in *addr,
7d9ac06f 877 const char *ip_addr,
54ceac45
DH		 878 rpc_authflavor_t authflavour,
879 int proto, int timeo, int retrans)
880{
881 struct nfs_client *clp;
882 int error;
883
884 dprintk("--> nfs4_set_client()\n");
885
886 /* Allocate or find a client reference we can use */
887 clp = nfs_get_client(hostname, addr, 4);
888 if (IS_ERR(clp)) {
889 error = PTR_ERR(clp);
890 goto error;
891 }
7d9ac06f 892 error = nfs4_init_client(clp, proto, timeo, retrans, ip_addr, authflavour);
54ceac45
DH		 893 if (error < 0)
894 goto error_put;
895
896 server->nfs_client = clp;
897 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
898 return 0;
899
900error_put:
901 nfs_put_client(clp);
902error:
903 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
904 return error;
905}
906
907/*
908 * Create a version 4 volume record
909 */
910static int nfs4_init_server(struct nfs_server *server,
911 const struct nfs4_mount_data *data, rpc_authflavor_t authflavour)
912{
913 int error;
914
915 dprintk("--> nfs4_init_server()\n");
916
917 /* Initialise the client representation from the mount data */
918 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
919 server->caps |= NFS_CAP_ATOMIC_OPEN;
920
921 if (data->rsize)
922 server->rsize = nfs_block_size(data->rsize, NULL);
923 if (data->wsize)
924 server->wsize = nfs_block_size(data->wsize, NULL);
925
926 server->acregmin = data->acregmin * HZ;
927 server->acregmax = data->acregmax * HZ;
928 server->acdirmin = data->acdirmin * HZ;
929 server->acdirmax = data->acdirmax * HZ;
930
931 error = nfs_init_server_rpcclient(server, authflavour);
932
933 /* Done */
934 dprintk("<-- nfs4_init_server() = %d\n", error);
935 return error;
936}
937
938/*
939 * Create a version 4 volume record
940 * - keyed on server and FSID
941 */
942struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *data,
943 const char *hostname,
944 const struct sockaddr_in *addr,
945 const char *mntpath,
946 const char *ip_addr,
947 rpc_authflavor_t authflavour,
948 struct nfs_fh *mntfh)
949{
950 struct nfs_fattr fattr;
951 struct nfs_server *server;
952 int error;
953
954 dprintk("--> nfs4_create_server()\n");
955
956 server = nfs_alloc_server();
957 if (!server)
958 return ERR_PTR(-ENOMEM);
959
960 /* Get a client record */
7d9ac06f 961 error = nfs4_set_client(server, hostname, addr, ip_addr, authflavour,
54ceac45
DH		 962 data->proto, data->timeo, data->retrans);
963 if (error < 0)
964 goto error;
965
966 /* set up the general RPC client */
967 error = nfs4_init_server(server, data, authflavour);
968 if (error < 0)
969 goto error;
970
971 BUG_ON(!server->nfs_client);
972 BUG_ON(!server->nfs_client->rpc_ops);
973 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
974
975 /* Probe the root fh to retrieve its FSID */
976 error = nfs4_path_walk(server, mntfh, mntpath);
977 if (error < 0)
978 goto error;
979
6daabf1b
DH		 980 dprintk("Server FSID: %llx:%llx\n",
981 (unsigned long long) server->fsid.major,
982 (unsigned long long) server->fsid.minor);
54ceac45
DH		 983 dprintk("Mount FH: %d\n", mntfh->size);
984
985 error = nfs_probe_fsinfo(server, mntfh, &fattr);
986 if (error < 0)
987 goto error;
988
54af3bb5
TM		 989 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
990 server->namelen = NFS4_MAXNAMLEN;
991
54ceac45
DH		 992 BUG_ON(!server->nfs_client);
993 BUG_ON(!server->nfs_client->rpc_ops);
994 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
995
996 spin_lock(&nfs_client_lock);
997 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
998 list_add_tail(&server->master_link, &nfs_volume_list);
999 spin_unlock(&nfs_client_lock);
1000
1001 server->mount_time = jiffies;
1002 dprintk("<-- nfs4_create_server() = %p\n", server);
1003 return server;
1004
1005error:
1006 nfs_free_server(server);
1007 dprintk("<-- nfs4_create_server() = error %d\n", error);
1008 return ERR_PTR(error);
1009}
1010
1011/*
1012 * Create an NFS4 referral server record
1013 */
1014struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
f2d0d85e 1015 struct nfs_fh *mntfh)
54ceac45
DH		 1016{
1017 struct nfs_client *parent_client;
1018 struct nfs_server *server, *parent_server;
1019 struct nfs_fattr fattr;
1020 int error;
1021
1022 dprintk("--> nfs4_create_referral_server()\n");
1023
1024 server = nfs_alloc_server();
1025 if (!server)
1026 return ERR_PTR(-ENOMEM);
1027
1028 parent_server = NFS_SB(data->sb);
1029 parent_client = parent_server->nfs_client;
1030
1031 /* Get a client representation.
1032 * Note: NFSv4 always uses TCP, */
1033 error = nfs4_set_client(server, data->hostname, data->addr,
7d9ac06f 1034 parent_client->cl_ipaddr,
54ceac45
DH		 1035 data->authflavor,
1036 parent_server->client->cl_xprt->prot,
1037 parent_client->retrans_timeo,
1038 parent_client->retrans_count);
297de4f6
AA		 1039 if (error < 0)
1040 goto error;
54ceac45
DH		 1041
1042 /* Initialise the client representation from the parent server */
1043 nfs_server_copy_userdata(server, parent_server);
1044 server->caps |= NFS_CAP_ATOMIC_OPEN;
1045
1046 error = nfs_init_server_rpcclient(server, data->authflavor);
1047 if (error < 0)
1048 goto error;
1049
1050 BUG_ON(!server->nfs_client);
1051 BUG_ON(!server->nfs_client->rpc_ops);
1052 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1053
f2d0d85e
TM		 1054 /* Probe the root fh to retrieve its FSID and filehandle */
1055 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1056 if (error < 0)
1057 goto error;
1058
54ceac45 1059 /* probe the filesystem info for this server filesystem */
f2d0d85e 1060 error = nfs_probe_fsinfo(server, mntfh, &fattr);
54ceac45
DH		 1061 if (error < 0)
1062 goto error;
1063
54af3bb5
TM		 1064 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1065 server->namelen = NFS4_MAXNAMLEN;
1066
54ceac45 1067 dprintk("Referral FSID: %llx:%llx\n",
6daabf1b
DH		 1068 (unsigned long long) server->fsid.major,
1069 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1070
1071 spin_lock(&nfs_client_lock);
1072 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1073 list_add_tail(&server->master_link, &nfs_volume_list);
1074 spin_unlock(&nfs_client_lock);
1075
1076 server->mount_time = jiffies;
1077
1078 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1079 return server;
1080
1081error:
1082 nfs_free_server(server);
1083 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1084 return ERR_PTR(error);
1085}
1086
1087#endif /* CONFIG_NFS_V4 */
1088
1089/*
1090 * Clone an NFS2, NFS3 or NFS4 server record
1091 */
1092struct nfs_server *nfs_clone_server(struct nfs_server *source,
1093 struct nfs_fh *fh,
1094 struct nfs_fattr *fattr)
1095{
1096 struct nfs_server *server;
1097 struct nfs_fattr fattr_fsinfo;
1098 int error;
1099
1100 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
6daabf1b
DH		 1101 (unsigned long long) fattr->fsid.major,
1102 (unsigned long long) fattr->fsid.minor);
54ceac45
DH		 1103
1104 server = nfs_alloc_server();
1105 if (!server)
1106 return ERR_PTR(-ENOMEM);
1107
1108 /* Copy data from the source */
1109 server->nfs_client = source->nfs_client;
1110 atomic_inc(&server->nfs_client->cl_count);
1111 nfs_server_copy_userdata(server, source);
1112
1113 server->fsid = fattr->fsid;
1114
1115 error = nfs_init_server_rpcclient(server, source->client->cl_auth->au_flavor);
1116 if (error < 0)
1117 goto out_free_server;
1118 if (!IS_ERR(source->client_acl))
1119 nfs_init_server_aclclient(server);
1120
1121 /* probe the filesystem info for this server filesystem */
1122 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1123 if (error < 0)
1124 goto out_free_server;
1125
54af3bb5
TM		 1126 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1127 server->namelen = NFS4_MAXNAMLEN;
1128
54ceac45 1129 dprintk("Cloned FSID: %llx:%llx\n",
6daabf1b
DH		 1130 (unsigned long long) server->fsid.major,
1131 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1132
1133 error = nfs_start_lockd(server);
1134 if (error < 0)
1135 goto out_free_server;
1136
1137 spin_lock(&nfs_client_lock);
1138 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1139 list_add_tail(&server->master_link, &nfs_volume_list);
1140 spin_unlock(&nfs_client_lock);
1141
1142 server->mount_time = jiffies;
1143
1144 dprintk("<-- nfs_clone_server() = %p\n", server);
1145 return server;
1146
1147out_free_server:
1148 nfs_free_server(server);
1149 dprintk("<-- nfs_clone_server() = error %d\n", error);
1150 return ERR_PTR(error);
1151}
6aaca566
DH		 1152
1153#ifdef CONFIG_PROC_FS
1154static struct proc_dir_entry *proc_fs_nfs;
1155
1156static int nfs_server_list_open(struct inode *inode, struct file *file);
1157static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1158static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1159static void nfs_server_list_stop(struct seq_file *p, void *v);
1160static int nfs_server_list_show(struct seq_file *m, void *v);
1161
1162static struct seq_operations nfs_server_list_ops = {
1163 .start = nfs_server_list_start,
1164 .next = nfs_server_list_next,
1165 .stop = nfs_server_list_stop,
1166 .show = nfs_server_list_show,
1167};
1168
00977a59 1169static const struct file_operations nfs_server_list_fops = {
6aaca566
DH		 1170 .open = nfs_server_list_open,
1171 .read = seq_read,
1172 .llseek = seq_lseek,
1173 .release = seq_release,
1174};
1175
1176static int nfs_volume_list_open(struct inode *inode, struct file *file);
1177static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1178static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1179static void nfs_volume_list_stop(struct seq_file *p, void *v);
1180static int nfs_volume_list_show(struct seq_file *m, void *v);
1181
1182static struct seq_operations nfs_volume_list_ops = {
1183 .start = nfs_volume_list_start,
1184 .next = nfs_volume_list_next,
1185 .stop = nfs_volume_list_stop,
1186 .show = nfs_volume_list_show,
1187};
1188
00977a59 1189static const struct file_operations nfs_volume_list_fops = {
6aaca566
DH		 1190 .open = nfs_volume_list_open,
1191 .read = seq_read,
1192 .llseek = seq_lseek,
1193 .release = seq_release,
1194};
1195
1196/*
1197 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1198 * we're dealing
1199 */
1200static int nfs_server_list_open(struct inode *inode, struct file *file)
1201{
1202 struct seq_file *m;
1203 int ret;
1204
1205 ret = seq_open(file, &nfs_server_list_ops);
1206 if (ret < 0)
1207 return ret;
1208
1209 m = file->private_data;
1210 m->private = PDE(inode)->data;
1211
1212 return 0;
1213}
1214
1215/*
1216 * set up the iterator to start reading from the server list and return the first item
1217 */
1218static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1219{
6aaca566
DH		 1220 /* lock the list against modification */
1221 spin_lock(&nfs_client_lock);
259902ea 1222 return seq_list_start_head(&nfs_client_list, *_pos);
6aaca566
DH		 1223}
1224
1225/*
1226 * move to next server
1227 */
1228static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1229{
259902ea 1230 return seq_list_next(v, &nfs_client_list, pos);
6aaca566
DH		 1231}
1232
1233/*
1234 * clean up after reading from the transports list
1235 */
1236static void nfs_server_list_stop(struct seq_file *p, void *v)
1237{
1238 spin_unlock(&nfs_client_lock);
1239}
1240
1241/*
1242 * display a header line followed by a load of call lines
1243 */
1244static int nfs_server_list_show(struct seq_file *m, void *v)
1245{
1246 struct nfs_client *clp;
1247
1248 /* display header on line 1 */
259902ea 1249 if (v == &nfs_client_list) {
6aaca566
DH		 1250 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1251 return 0;
1252 }
1253
1254 /* display one transport per line on subsequent lines */
1255 clp = list_entry(v, struct nfs_client, cl_share_link);
1256
1257 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %3d %s\n",
1258 clp->cl_nfsversion,
1259 NIPQUAD(clp->cl_addr.sin_addr),
1260 ntohs(clp->cl_addr.sin_port),
1261 atomic_read(&clp->cl_count),
1262 clp->cl_hostname);
1263
1264 return 0;
1265}
1266
1267/*
1268 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1269 */
1270static int nfs_volume_list_open(struct inode *inode, struct file *file)
1271{
1272 struct seq_file *m;
1273 int ret;
1274
1275 ret = seq_open(file, &nfs_volume_list_ops);
1276 if (ret < 0)
1277 return ret;
1278
1279 m = file->private_data;
1280 m->private = PDE(inode)->data;
1281
1282 return 0;
1283}
1284
1285/*
1286 * set up the iterator to start reading from the volume list and return the first item
1287 */
1288static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1289{
6aaca566
DH		 1290 /* lock the list against modification */
1291 spin_lock(&nfs_client_lock);
259902ea 1292 return seq_list_start_head(&nfs_volume_list, *_pos);
6aaca566
DH		 1293}
1294
1295/*
1296 * move to next volume
1297 */
1298static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1299{
259902ea 1300 return seq_list_next(v, &nfs_volume_list, pos);
6aaca566
DH		 1301}
1302
1303/*
1304 * clean up after reading from the transports list
1305 */
1306static void nfs_volume_list_stop(struct seq_file *p, void *v)
1307{
1308 spin_unlock(&nfs_client_lock);
1309}
1310
1311/*
1312 * display a header line followed by a load of call lines
1313 */
1314static int nfs_volume_list_show(struct seq_file *m, void *v)
1315{
1316 struct nfs_server *server;
1317 struct nfs_client *clp;
1318 char dev[8], fsid[17];
1319
1320 /* display header on line 1 */
259902ea 1321 if (v == &nfs_volume_list) {
6aaca566
DH		 1322 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1323 return 0;
1324 }
1325 /* display one transport per line on subsequent lines */
1326 server = list_entry(v, struct nfs_server, master_link);
1327 clp = server->nfs_client;
1328
1329 snprintf(dev, 8, "%u:%u",
1330 MAJOR(server->s_dev), MINOR(server->s_dev));
1331
1332 snprintf(fsid, 17, "%llx:%llx",
6daabf1b
DH		 1333 (unsigned long long) server->fsid.major,
1334 (unsigned long long) server->fsid.minor);
6aaca566
DH		 1335
1336 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %-7s %-17s\n",
1337 clp->cl_nfsversion,
1338 NIPQUAD(clp->cl_addr.sin_addr),
1339 ntohs(clp->cl_addr.sin_port),
1340 dev,
1341 fsid);
1342
1343 return 0;
1344}
1345
1346/*
1347 * initialise the /proc/fs/nfsfs/ directory
1348 */
1349int __init nfs_fs_proc_init(void)
1350{
1351 struct proc_dir_entry *p;
1352
1353 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
1354 if (!proc_fs_nfs)
1355 goto error_0;
1356
1357 proc_fs_nfs->owner = THIS_MODULE;
1358
1359 /* a file of servers with which we're dealing */
1360 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs);
1361 if (!p)
1362 goto error_1;
1363
1364 p->proc_fops = &nfs_server_list_fops;
1365 p->owner = THIS_MODULE;
1366
1367 /* a file of volumes that we have mounted */
1368 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
1369 if (!p)
1370 goto error_2;
1371
1372 p->proc_fops = &nfs_volume_list_fops;
1373 p->owner = THIS_MODULE;
1374 return 0;
1375
1376error_2:
1377 remove_proc_entry("servers", proc_fs_nfs);
1378error_1:
1379 remove_proc_entry("nfsfs", proc_root_fs);
1380error_0:
1381 return -ENOMEM;
1382}
1383
1384/*
1385 * clean up the /proc/fs/nfsfs/ directory
1386 */
1387void nfs_fs_proc_exit(void)
1388{
1389 remove_proc_entry("volumes", proc_fs_nfs);
1390 remove_proc_entry("servers", proc_fs_nfs);
1391 remove_proc_entry("nfsfs", proc_root_fs);
1392}
1393
1394#endif /* CONFIG_PROC_FS */
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