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NFS: Support per-mountpoint timeout parameters.
[deliverable/linux.git] / fs / nfs / client.c
1 /* client.c: NFS client sharing and management code
2 *
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/sched.h>
16 #include <linux/time.h>
17 #include <linux/kernel.h>
18 #include <linux/mm.h>
19 #include <linux/string.h>
20 #include <linux/stat.h>
21 #include <linux/errno.h>
22 #include <linux/unistd.h>
23 #include <linux/sunrpc/clnt.h>
24 #include <linux/sunrpc/stats.h>
25 #include <linux/sunrpc/metrics.h>
26 #include <linux/sunrpc/xprtsock.h>
27 #include <linux/sunrpc/xprtrdma.h>
28 #include <linux/nfs_fs.h>
29 #include <linux/nfs_mount.h>
30 #include <linux/nfs4_mount.h>
31 #include <linux/lockd/bind.h>
32 #include <linux/seq_file.h>
33 #include <linux/mount.h>
34 #include <linux/nfs_idmap.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/in6.h>
38 #include <net/ipv6.h>
39 #include <linux/nfs_xdr.h>
40
41 #include <asm/system.h>
42
43 #include "nfs4_fs.h"
44 #include "callback.h"
45 #include "delegation.h"
46 #include "iostat.h"
47 #include "internal.h"
48
49 #define NFSDBG_FACILITY NFSDBG_CLIENT
50
51 static DEFINE_SPINLOCK(nfs_client_lock);
52 static LIST_HEAD(nfs_client_list);
53 static LIST_HEAD(nfs_volume_list);
54 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
55
56 /*
57 * RPC cruft for NFS
58 */
59 static struct rpc_version *nfs_version[5] = {
60 [2] = &nfs_version2,
61 #ifdef CONFIG_NFS_V3
62 [3] = &nfs_version3,
63 #endif
64 #ifdef CONFIG_NFS_V4
65 [4] = &nfs_version4,
66 #endif
67 };
68
69 struct rpc_program nfs_program = {
70 .name = "nfs",
71 .number = NFS_PROGRAM,
72 .nrvers = ARRAY_SIZE(nfs_version),
73 .version = nfs_version,
74 .stats = &nfs_rpcstat,
75 .pipe_dir_name = "/nfs",
76 };
77
78 struct rpc_stat nfs_rpcstat = {
79 .program = &nfs_program
80 };
81
82
83 #ifdef CONFIG_NFS_V3_ACL
84 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
85 static struct rpc_version * nfsacl_version[] = {
86 [3] = &nfsacl_version3,
87 };
88
89 struct rpc_program nfsacl_program = {
90 .name = "nfsacl",
91 .number = NFS_ACL_PROGRAM,
92 .nrvers = ARRAY_SIZE(nfsacl_version),
93 .version = nfsacl_version,
94 .stats = &nfsacl_rpcstat,
95 };
96 #endif /* CONFIG_NFS_V3_ACL */
97
98 struct nfs_client_initdata {
99 const char *hostname;
100 const struct sockaddr *addr;
101 size_t addrlen;
102 const struct nfs_rpc_ops *rpc_ops;
103 };
104
105 /*
106 * Allocate a shared client record
107 *
108 * Since these are allocated/deallocated very rarely, we don't
109 * bother putting them in a slab cache...
110 */
111 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
112 {
113 struct nfs_client *clp;
114
115 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
116 goto error_0;
117
118 clp->rpc_ops = cl_init->rpc_ops;
119
120 if (cl_init->rpc_ops->version == 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 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
130 clp->cl_addrlen = cl_init->addrlen;
131
132 if (cl_init->hostname) {
133 clp->cl_hostname = kstrdup(cl_init->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 spin_lock_init(&clp->cl_lock);
145 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
146 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
147 clp->cl_boot_time = CURRENT_TIME;
148 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
149 #endif
150
151 return clp;
152
153 error_3:
154 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
155 nfs_callback_down();
156 error_2:
157 kfree(clp);
158 error_0:
159 return NULL;
160 }
161
162 static void nfs4_shutdown_client(struct nfs_client *clp)
163 {
164 #ifdef CONFIG_NFS_V4
165 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
166 nfs4_kill_renewd(clp);
167 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
168 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
169 nfs_idmap_delete(clp);
170 #endif
171 }
172
173 /*
174 * Destroy a shared client record
175 */
176 static void nfs_free_client(struct nfs_client *clp)
177 {
178 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
179
180 nfs4_shutdown_client(clp);
181
182 /* -EIO all pending I/O */
183 if (!IS_ERR(clp->cl_rpcclient))
184 rpc_shutdown_client(clp->cl_rpcclient);
185
186 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
187 nfs_callback_down();
188
189 kfree(clp->cl_hostname);
190 kfree(clp);
191
192 dprintk("<-- nfs_free_client()\n");
193 }
194
195 /*
196 * Release a reference to a shared client record
197 */
198 void nfs_put_client(struct nfs_client *clp)
199 {
200 if (!clp)
201 return;
202
203 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
204
205 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
206 list_del(&clp->cl_share_link);
207 spin_unlock(&nfs_client_lock);
208
209 BUG_ON(!list_empty(&clp->cl_superblocks));
210
211 nfs_free_client(clp);
212 }
213 }
214
215 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
216 const struct sockaddr_in *sa2)
217 {
218 return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
219 }
220
221 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr_in6 *sa1,
222 const struct sockaddr_in6 *sa2)
223 {
224 return ipv6_addr_equal(&sa1->sin6_addr, &sa2->sin6_addr);
225 }
226
227 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
228 const struct sockaddr *sa2)
229 {
230 switch (sa1->sa_family) {
231 case AF_INET:
232 return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
233 (const struct sockaddr_in *)sa2);
234 case AF_INET6:
235 return nfs_sockaddr_match_ipaddr6((const struct sockaddr_in6 *)sa1,
236 (const struct sockaddr_in6 *)sa2);
237 }
238 BUG();
239 }
240
241 /*
242 * Find a client by IP address and protocol version
243 * - returns NULL if no such client
244 */
245 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
246 {
247 struct nfs_client *clp;
248
249 spin_lock(&nfs_client_lock);
250 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
251 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
252
253 /* Don't match clients that failed to initialise properly */
254 if (clp->cl_cons_state != NFS_CS_READY)
255 continue;
256
257 /* Different NFS versions cannot share the same nfs_client */
258 if (clp->rpc_ops->version != nfsversion)
259 continue;
260
261 if (addr->sa_family != clap->sa_family)
262 continue;
263 /* Match only the IP address, not the port number */
264 if (!nfs_sockaddr_match_ipaddr(addr, clap))
265 continue;
266
267 atomic_inc(&clp->cl_count);
268 spin_unlock(&nfs_client_lock);
269 return clp;
270 }
271 spin_unlock(&nfs_client_lock);
272 return NULL;
273 }
274
275 /*
276 * Find an nfs_client on the list that matches the initialisation data
277 * that is supplied.
278 */
279 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
280 {
281 struct nfs_client *clp;
282
283 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
284 /* Don't match clients that failed to initialise properly */
285 if (clp->cl_cons_state < 0)
286 continue;
287
288 /* Different NFS versions cannot share the same nfs_client */
289 if (clp->rpc_ops != data->rpc_ops)
290 continue;
291
292 /* Match the full socket address */
293 if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
294 continue;
295
296 atomic_inc(&clp->cl_count);
297 return clp;
298 }
299 return NULL;
300 }
301
302 /*
303 * Look up a client by IP address and protocol version
304 * - creates a new record if one doesn't yet exist
305 */
306 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
307 {
308 struct nfs_client *clp, *new = NULL;
309 int error;
310
311 dprintk("--> nfs_get_client(%s,v%u)\n",
312 cl_init->hostname ?: "", cl_init->rpc_ops->version);
313
314 /* see if the client already exists */
315 do {
316 spin_lock(&nfs_client_lock);
317
318 clp = nfs_match_client(cl_init);
319 if (clp)
320 goto found_client;
321 if (new)
322 goto install_client;
323
324 spin_unlock(&nfs_client_lock);
325
326 new = nfs_alloc_client(cl_init);
327 } while (new);
328
329 return ERR_PTR(-ENOMEM);
330
331 /* install a new client and return with it unready */
332 install_client:
333 clp = new;
334 list_add(&clp->cl_share_link, &nfs_client_list);
335 spin_unlock(&nfs_client_lock);
336 dprintk("--> nfs_get_client() = %p [new]\n", clp);
337 return clp;
338
339 /* found an existing client
340 * - make sure it's ready before returning
341 */
342 found_client:
343 spin_unlock(&nfs_client_lock);
344
345 if (new)
346 nfs_free_client(new);
347
348 error = wait_event_interruptible(nfs_client_active_wq,
349 clp->cl_cons_state != NFS_CS_INITING);
350 if (error < 0) {
351 nfs_put_client(clp);
352 return ERR_PTR(-ERESTARTSYS);
353 }
354
355 if (clp->cl_cons_state < NFS_CS_READY) {
356 error = clp->cl_cons_state;
357 nfs_put_client(clp);
358 return ERR_PTR(error);
359 }
360
361 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
362
363 dprintk("--> nfs_get_client() = %p [share]\n", clp);
364 return clp;
365 }
366
367 /*
368 * Mark a server as ready or failed
369 */
370 static void nfs_mark_client_ready(struct nfs_client *clp, int state)
371 {
372 clp->cl_cons_state = state;
373 wake_up_all(&nfs_client_active_wq);
374 }
375
376 /*
377 * Initialise the timeout values for a connection
378 */
379 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
380 unsigned int timeo, unsigned int retrans)
381 {
382 to->to_initval = timeo * HZ / 10;
383 to->to_retries = retrans;
384 if (!to->to_retries)
385 to->to_retries = 2;
386
387 switch (proto) {
388 case XPRT_TRANSPORT_TCP:
389 case XPRT_TRANSPORT_RDMA:
390 if (to->to_initval == 0)
391 to->to_initval = 60 * HZ;
392 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
393 to->to_initval = NFS_MAX_TCP_TIMEOUT;
394 to->to_increment = to->to_initval;
395 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
396 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
397 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
398 if (to->to_maxval < to->to_initval)
399 to->to_maxval = to->to_initval;
400 to->to_exponential = 0;
401 break;
402 case XPRT_TRANSPORT_UDP:
403 default:
404 if (!to->to_initval)
405 to->to_initval = 11 * HZ / 10;
406 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
407 to->to_initval = NFS_MAX_UDP_TIMEOUT;
408 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
409 to->to_exponential = 1;
410 break;
411 }
412 }
413
414 /*
415 * Create an RPC client handle
416 */
417 static int nfs_create_rpc_client(struct nfs_client *clp, int proto,
418 const struct rpc_timeout *timeparms,
419 rpc_authflavor_t flavor,
420 int flags)
421 {
422 struct rpc_clnt *clnt = NULL;
423 struct rpc_create_args args = {
424 .protocol = proto,
425 .address = (struct sockaddr *)&clp->cl_addr,
426 .addrsize = clp->cl_addrlen,
427 .timeout = timeparms,
428 .servername = clp->cl_hostname,
429 .program = &nfs_program,
430 .version = clp->rpc_ops->version,
431 .authflavor = flavor,
432 .flags = flags,
433 };
434
435 if (!IS_ERR(clp->cl_rpcclient))
436 return 0;
437
438 clnt = rpc_create(&args);
439 if (IS_ERR(clnt)) {
440 dprintk("%s: cannot create RPC client. Error = %ld\n",
441 __FUNCTION__, PTR_ERR(clnt));
442 return PTR_ERR(clnt);
443 }
444
445 clp->cl_rpcclient = clnt;
446 return 0;
447 }
448
449 /*
450 * Version 2 or 3 client destruction
451 */
452 static void nfs_destroy_server(struct nfs_server *server)
453 {
454 if (!(server->flags & NFS_MOUNT_NONLM))
455 lockd_down(); /* release rpc.lockd */
456 }
457
458 /*
459 * Version 2 or 3 lockd setup
460 */
461 static int nfs_start_lockd(struct nfs_server *server)
462 {
463 int error = 0;
464
465 if (server->nfs_client->rpc_ops->version > 3)
466 goto out;
467 if (server->flags & NFS_MOUNT_NONLM)
468 goto out;
469 error = lockd_up((server->flags & NFS_MOUNT_TCP) ?
470 IPPROTO_TCP : IPPROTO_UDP);
471 if (error < 0)
472 server->flags |= NFS_MOUNT_NONLM;
473 else
474 server->destroy = nfs_destroy_server;
475 out:
476 return error;
477 }
478
479 /*
480 * Initialise an NFSv3 ACL client connection
481 */
482 #ifdef CONFIG_NFS_V3_ACL
483 static void nfs_init_server_aclclient(struct nfs_server *server)
484 {
485 if (server->nfs_client->rpc_ops->version != 3)
486 goto out_noacl;
487 if (server->flags & NFS_MOUNT_NOACL)
488 goto out_noacl;
489
490 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
491 if (IS_ERR(server->client_acl))
492 goto out_noacl;
493
494 /* No errors! Assume that Sun nfsacls are supported */
495 server->caps |= NFS_CAP_ACLS;
496 return;
497
498 out_noacl:
499 server->caps &= ~NFS_CAP_ACLS;
500 }
501 #else
502 static inline void nfs_init_server_aclclient(struct nfs_server *server)
503 {
504 server->flags &= ~NFS_MOUNT_NOACL;
505 server->caps &= ~NFS_CAP_ACLS;
506 }
507 #endif
508
509 /*
510 * Create a general RPC client
511 */
512 static int nfs_init_server_rpcclient(struct nfs_server *server,
513 const struct rpc_timeout *timeo,
514 rpc_authflavor_t pseudoflavour)
515 {
516 struct nfs_client *clp = server->nfs_client;
517
518 server->client = rpc_clone_client(clp->cl_rpcclient);
519 if (IS_ERR(server->client)) {
520 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
521 return PTR_ERR(server->client);
522 }
523
524 memcpy(&server->client->cl_timeout_default,
525 timeo,
526 sizeof(server->client->cl_timeout_default));
527 server->client->cl_timeout = &server->client->cl_timeout_default;
528
529 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
530 struct rpc_auth *auth;
531
532 auth = rpcauth_create(pseudoflavour, server->client);
533 if (IS_ERR(auth)) {
534 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
535 return PTR_ERR(auth);
536 }
537 }
538 server->client->cl_softrtry = 0;
539 if (server->flags & NFS_MOUNT_SOFT)
540 server->client->cl_softrtry = 1;
541
542 server->client->cl_intr = 0;
543 if (server->flags & NFS4_MOUNT_INTR)
544 server->client->cl_intr = 1;
545
546 return 0;
547 }
548
549 /*
550 * Initialise an NFS2 or NFS3 client
551 */
552 static int nfs_init_client(struct nfs_client *clp,
553 const struct rpc_timeout *timeparms,
554 const struct nfs_parsed_mount_data *data)
555 {
556 int error;
557
558 if (clp->cl_cons_state == NFS_CS_READY) {
559 /* the client is already initialised */
560 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
561 return 0;
562 }
563
564 /*
565 * Create a client RPC handle for doing FSSTAT with UNIX auth only
566 * - RFC 2623, sec 2.3.2
567 */
568 error = nfs_create_rpc_client(clp, data->nfs_server.protocol,
569 timeparms, RPC_AUTH_UNIX, 0);
570 if (error < 0)
571 goto error;
572 nfs_mark_client_ready(clp, NFS_CS_READY);
573 return 0;
574
575 error:
576 nfs_mark_client_ready(clp, error);
577 dprintk("<-- nfs_init_client() = xerror %d\n", error);
578 return error;
579 }
580
581 /*
582 * Create a version 2 or 3 client
583 */
584 static int nfs_init_server(struct nfs_server *server,
585 const struct nfs_parsed_mount_data *data)
586 {
587 struct nfs_client_initdata cl_init = {
588 .hostname = data->nfs_server.hostname,
589 .addr = (const struct sockaddr *)&data->nfs_server.address,
590 .addrlen = data->nfs_server.addrlen,
591 .rpc_ops = &nfs_v2_clientops,
592 };
593 struct rpc_timeout timeparms;
594 struct nfs_client *clp;
595 int error;
596
597 dprintk("--> nfs_init_server()\n");
598
599 #ifdef CONFIG_NFS_V3
600 if (data->flags & NFS_MOUNT_VER3)
601 cl_init.rpc_ops = &nfs_v3_clientops;
602 #endif
603
604 /* Allocate or find a client reference we can use */
605 clp = nfs_get_client(&cl_init);
606 if (IS_ERR(clp)) {
607 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
608 return PTR_ERR(clp);
609 }
610
611 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
612 data->timeo, data->retrans);
613 error = nfs_init_client(clp, &timeparms, data);
614 if (error < 0)
615 goto error;
616
617 server->nfs_client = clp;
618
619 /* Initialise the client representation from the mount data */
620 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
621
622 if (data->rsize)
623 server->rsize = nfs_block_size(data->rsize, NULL);
624 if (data->wsize)
625 server->wsize = nfs_block_size(data->wsize, NULL);
626
627 server->acregmin = data->acregmin * HZ;
628 server->acregmax = data->acregmax * HZ;
629 server->acdirmin = data->acdirmin * HZ;
630 server->acdirmax = data->acdirmax * HZ;
631
632 /* Start lockd here, before we might error out */
633 error = nfs_start_lockd(server);
634 if (error < 0)
635 goto error;
636
637 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
638 if (error < 0)
639 goto error;
640
641 server->namelen = data->namlen;
642 /* Create a client RPC handle for the NFSv3 ACL management interface */
643 nfs_init_server_aclclient(server);
644 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
645 return 0;
646
647 error:
648 server->nfs_client = NULL;
649 nfs_put_client(clp);
650 dprintk("<-- nfs_init_server() = xerror %d\n", error);
651 return error;
652 }
653
654 /*
655 * Load up the server record from information gained in an fsinfo record
656 */
657 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
658 {
659 unsigned long max_rpc_payload;
660
661 /* Work out a lot of parameters */
662 if (server->rsize == 0)
663 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
664 if (server->wsize == 0)
665 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
666
667 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
668 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
669 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
670 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
671
672 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
673 if (server->rsize > max_rpc_payload)
674 server->rsize = max_rpc_payload;
675 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
676 server->rsize = NFS_MAX_FILE_IO_SIZE;
677 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
678
679 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
680
681 if (server->wsize > max_rpc_payload)
682 server->wsize = max_rpc_payload;
683 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
684 server->wsize = NFS_MAX_FILE_IO_SIZE;
685 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
686 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
687
688 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
689 if (server->dtsize > PAGE_CACHE_SIZE)
690 server->dtsize = PAGE_CACHE_SIZE;
691 if (server->dtsize > server->rsize)
692 server->dtsize = server->rsize;
693
694 if (server->flags & NFS_MOUNT_NOAC) {
695 server->acregmin = server->acregmax = 0;
696 server->acdirmin = server->acdirmax = 0;
697 }
698
699 server->maxfilesize = fsinfo->maxfilesize;
700
701 /* We're airborne Set socket buffersize */
702 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
703 }
704
705 /*
706 * Probe filesystem information, including the FSID on v2/v3
707 */
708 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
709 {
710 struct nfs_fsinfo fsinfo;
711 struct nfs_client *clp = server->nfs_client;
712 int error;
713
714 dprintk("--> nfs_probe_fsinfo()\n");
715
716 if (clp->rpc_ops->set_capabilities != NULL) {
717 error = clp->rpc_ops->set_capabilities(server, mntfh);
718 if (error < 0)
719 goto out_error;
720 }
721
722 fsinfo.fattr = fattr;
723 nfs_fattr_init(fattr);
724 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
725 if (error < 0)
726 goto out_error;
727
728 nfs_server_set_fsinfo(server, &fsinfo);
729 error = bdi_init(&server->backing_dev_info);
730 if (error)
731 goto out_error;
732
733
734 /* Get some general file system info */
735 if (server->namelen == 0) {
736 struct nfs_pathconf pathinfo;
737
738 pathinfo.fattr = fattr;
739 nfs_fattr_init(fattr);
740
741 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
742 server->namelen = pathinfo.max_namelen;
743 }
744
745 dprintk("<-- nfs_probe_fsinfo() = 0\n");
746 return 0;
747
748 out_error:
749 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
750 return error;
751 }
752
753 /*
754 * Copy useful information when duplicating a server record
755 */
756 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
757 {
758 target->flags = source->flags;
759 target->acregmin = source->acregmin;
760 target->acregmax = source->acregmax;
761 target->acdirmin = source->acdirmin;
762 target->acdirmax = source->acdirmax;
763 target->caps = source->caps;
764 }
765
766 /*
767 * Allocate and initialise a server record
768 */
769 static struct nfs_server *nfs_alloc_server(void)
770 {
771 struct nfs_server *server;
772
773 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
774 if (!server)
775 return NULL;
776
777 server->client = server->client_acl = ERR_PTR(-EINVAL);
778
779 /* Zero out the NFS state stuff */
780 INIT_LIST_HEAD(&server->client_link);
781 INIT_LIST_HEAD(&server->master_link);
782
783 init_waitqueue_head(&server->active_wq);
784 atomic_set(&server->active, 0);
785
786 server->io_stats = nfs_alloc_iostats();
787 if (!server->io_stats) {
788 kfree(server);
789 return NULL;
790 }
791
792 return server;
793 }
794
795 /*
796 * Free up a server record
797 */
798 void nfs_free_server(struct nfs_server *server)
799 {
800 dprintk("--> nfs_free_server()\n");
801
802 spin_lock(&nfs_client_lock);
803 list_del(&server->client_link);
804 list_del(&server->master_link);
805 spin_unlock(&nfs_client_lock);
806
807 if (server->destroy != NULL)
808 server->destroy(server);
809
810 if (!IS_ERR(server->client_acl))
811 rpc_shutdown_client(server->client_acl);
812 if (!IS_ERR(server->client))
813 rpc_shutdown_client(server->client);
814
815 nfs_put_client(server->nfs_client);
816
817 nfs_free_iostats(server->io_stats);
818 bdi_destroy(&server->backing_dev_info);
819 kfree(server);
820 nfs_release_automount_timer();
821 dprintk("<-- nfs_free_server()\n");
822 }
823
824 /*
825 * Create a version 2 or 3 volume record
826 * - keyed on server and FSID
827 */
828 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
829 struct nfs_fh *mntfh)
830 {
831 struct nfs_server *server;
832 struct nfs_fattr fattr;
833 int error;
834
835 server = nfs_alloc_server();
836 if (!server)
837 return ERR_PTR(-ENOMEM);
838
839 /* Get a client representation */
840 error = nfs_init_server(server, data);
841 if (error < 0)
842 goto error;
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 /* Probe the root fh to retrieve its FSID */
849 error = nfs_probe_fsinfo(server, mntfh, &fattr);
850 if (error < 0)
851 goto error;
852 if (server->nfs_client->rpc_ops->version == 3) {
853 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
854 server->namelen = NFS3_MAXNAMLEN;
855 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
856 server->caps |= NFS_CAP_READDIRPLUS;
857 } else {
858 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
859 server->namelen = NFS2_MAXNAMLEN;
860 }
861
862 if (!(fattr.valid & NFS_ATTR_FATTR)) {
863 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
864 if (error < 0) {
865 dprintk("nfs_create_server: getattr error = %d\n", -error);
866 goto error;
867 }
868 }
869 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
870
871 dprintk("Server FSID: %llx:%llx\n",
872 (unsigned long long) server->fsid.major,
873 (unsigned long long) server->fsid.minor);
874
875 BUG_ON(!server->nfs_client);
876 BUG_ON(!server->nfs_client->rpc_ops);
877 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
878
879 spin_lock(&nfs_client_lock);
880 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
881 list_add_tail(&server->master_link, &nfs_volume_list);
882 spin_unlock(&nfs_client_lock);
883
884 server->mount_time = jiffies;
885 return server;
886
887 error:
888 nfs_free_server(server);
889 return ERR_PTR(error);
890 }
891
892 #ifdef CONFIG_NFS_V4
893 /*
894 * Initialise an NFS4 client record
895 */
896 static int nfs4_init_client(struct nfs_client *clp,
897 int proto,
898 const struct rpc_timeout *timeparms,
899 const char *ip_addr,
900 rpc_authflavor_t authflavour)
901 {
902 int error;
903
904 if (clp->cl_cons_state == NFS_CS_READY) {
905 /* the client is initialised already */
906 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
907 return 0;
908 }
909
910 /* Check NFS protocol revision and initialize RPC op vector */
911 clp->rpc_ops = &nfs_v4_clientops;
912
913 error = nfs_create_rpc_client(clp, proto, timeparms, authflavour,
914 RPC_CLNT_CREATE_DISCRTRY);
915 if (error < 0)
916 goto error;
917 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
918
919 error = nfs_idmap_new(clp);
920 if (error < 0) {
921 dprintk("%s: failed to create idmapper. Error = %d\n",
922 __FUNCTION__, error);
923 goto error;
924 }
925 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
926
927 nfs_mark_client_ready(clp, NFS_CS_READY);
928 return 0;
929
930 error:
931 nfs_mark_client_ready(clp, error);
932 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
933 return error;
934 }
935
936 /*
937 * Set up an NFS4 client
938 */
939 static int nfs4_set_client(struct nfs_server *server,
940 const char *hostname,
941 const struct sockaddr *addr,
942 const size_t addrlen,
943 const char *ip_addr,
944 rpc_authflavor_t authflavour,
945 int proto, const struct rpc_timeout *timeparms)
946 {
947 struct nfs_client_initdata cl_init = {
948 .hostname = hostname,
949 .addr = addr,
950 .addrlen = addrlen,
951 .rpc_ops = &nfs_v4_clientops,
952 };
953 struct nfs_client *clp;
954 int error;
955
956 dprintk("--> nfs4_set_client()\n");
957
958 /* Allocate or find a client reference we can use */
959 clp = nfs_get_client(&cl_init);
960 if (IS_ERR(clp)) {
961 error = PTR_ERR(clp);
962 goto error;
963 }
964 error = nfs4_init_client(clp, proto, timeparms, ip_addr, authflavour);
965 if (error < 0)
966 goto error_put;
967
968 server->nfs_client = clp;
969 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
970 return 0;
971
972 error_put:
973 nfs_put_client(clp);
974 error:
975 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
976 return error;
977 }
978
979 /*
980 * Create a version 4 volume record
981 */
982 static int nfs4_init_server(struct nfs_server *server,
983 const struct nfs_parsed_mount_data *data)
984 {
985 struct rpc_timeout timeparms;
986 int error;
987
988 dprintk("--> nfs4_init_server()\n");
989
990 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
991 data->timeo, data->retrans);
992
993 /* Get a client record */
994 error = nfs4_set_client(server,
995 data->nfs_server.hostname,
996 (const struct sockaddr *)&data->nfs_server.address,
997 data->nfs_server.addrlen,
998 data->client_address,
999 data->auth_flavors[0],
1000 data->nfs_server.protocol,
1001 &timeparms);
1002 if (error < 0)
1003 goto error;
1004
1005 /* Initialise the client representation from the mount data */
1006 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1007 server->caps |= NFS_CAP_ATOMIC_OPEN;
1008
1009 if (data->rsize)
1010 server->rsize = nfs_block_size(data->rsize, NULL);
1011 if (data->wsize)
1012 server->wsize = nfs_block_size(data->wsize, NULL);
1013
1014 server->acregmin = data->acregmin * HZ;
1015 server->acregmax = data->acregmax * HZ;
1016 server->acdirmin = data->acdirmin * HZ;
1017 server->acdirmax = data->acdirmax * HZ;
1018
1019 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1020
1021 error:
1022 /* Done */
1023 dprintk("<-- nfs4_init_server() = %d\n", error);
1024 return error;
1025 }
1026
1027 /*
1028 * Create a version 4 volume record
1029 * - keyed on server and FSID
1030 */
1031 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1032 struct nfs_fh *mntfh)
1033 {
1034 struct nfs_fattr fattr;
1035 struct nfs_server *server;
1036 int error;
1037
1038 dprintk("--> nfs4_create_server()\n");
1039
1040 server = nfs_alloc_server();
1041 if (!server)
1042 return ERR_PTR(-ENOMEM);
1043
1044 /* set up the general RPC client */
1045 error = nfs4_init_server(server, data);
1046 if (error < 0)
1047 goto error;
1048
1049 BUG_ON(!server->nfs_client);
1050 BUG_ON(!server->nfs_client->rpc_ops);
1051 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1052
1053 /* Probe the root fh to retrieve its FSID */
1054 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1055 if (error < 0)
1056 goto error;
1057
1058 dprintk("Server FSID: %llx:%llx\n",
1059 (unsigned long long) server->fsid.major,
1060 (unsigned long long) server->fsid.minor);
1061 dprintk("Mount FH: %d\n", mntfh->size);
1062
1063 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1064 if (error < 0)
1065 goto error;
1066
1067 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1068 server->namelen = NFS4_MAXNAMLEN;
1069
1070 BUG_ON(!server->nfs_client);
1071 BUG_ON(!server->nfs_client->rpc_ops);
1072 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1073
1074 spin_lock(&nfs_client_lock);
1075 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1076 list_add_tail(&server->master_link, &nfs_volume_list);
1077 spin_unlock(&nfs_client_lock);
1078
1079 server->mount_time = jiffies;
1080 dprintk("<-- nfs4_create_server() = %p\n", server);
1081 return server;
1082
1083 error:
1084 nfs_free_server(server);
1085 dprintk("<-- nfs4_create_server() = error %d\n", error);
1086 return ERR_PTR(error);
1087 }
1088
1089 /*
1090 * Create an NFS4 referral server record
1091 */
1092 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1093 struct nfs_fh *mntfh)
1094 {
1095 struct nfs_client *parent_client;
1096 struct nfs_server *server, *parent_server;
1097 struct nfs_fattr fattr;
1098 int error;
1099
1100 dprintk("--> nfs4_create_referral_server()\n");
1101
1102 server = nfs_alloc_server();
1103 if (!server)
1104 return ERR_PTR(-ENOMEM);
1105
1106 parent_server = NFS_SB(data->sb);
1107 parent_client = parent_server->nfs_client;
1108
1109 /* Get a client representation.
1110 * Note: NFSv4 always uses TCP, */
1111 error = nfs4_set_client(server, data->hostname,
1112 data->addr,
1113 data->addrlen,
1114 parent_client->cl_ipaddr,
1115 data->authflavor,
1116 parent_server->client->cl_xprt->prot,
1117 parent_server->client->cl_timeout);
1118 if (error < 0)
1119 goto error;
1120
1121 /* Initialise the client representation from the parent server */
1122 nfs_server_copy_userdata(server, parent_server);
1123 server->caps |= NFS_CAP_ATOMIC_OPEN;
1124
1125 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1126 if (error < 0)
1127 goto error;
1128
1129 BUG_ON(!server->nfs_client);
1130 BUG_ON(!server->nfs_client->rpc_ops);
1131 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1132
1133 /* Probe the root fh to retrieve its FSID and filehandle */
1134 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1135 if (error < 0)
1136 goto error;
1137
1138 /* probe the filesystem info for this server filesystem */
1139 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1140 if (error < 0)
1141 goto error;
1142
1143 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1144 server->namelen = NFS4_MAXNAMLEN;
1145
1146 dprintk("Referral FSID: %llx:%llx\n",
1147 (unsigned long long) server->fsid.major,
1148 (unsigned long long) server->fsid.minor);
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_create_referral_server() = %p\n", server);
1158 return server;
1159
1160 error:
1161 nfs_free_server(server);
1162 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1163 return ERR_PTR(error);
1164 }
1165
1166 #endif /* CONFIG_NFS_V4 */
1167
1168 /*
1169 * Clone an NFS2, NFS3 or NFS4 server record
1170 */
1171 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1172 struct nfs_fh *fh,
1173 struct nfs_fattr *fattr)
1174 {
1175 struct nfs_server *server;
1176 struct nfs_fattr fattr_fsinfo;
1177 int error;
1178
1179 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1180 (unsigned long long) fattr->fsid.major,
1181 (unsigned long long) fattr->fsid.minor);
1182
1183 server = nfs_alloc_server();
1184 if (!server)
1185 return ERR_PTR(-ENOMEM);
1186
1187 /* Copy data from the source */
1188 server->nfs_client = source->nfs_client;
1189 atomic_inc(&server->nfs_client->cl_count);
1190 nfs_server_copy_userdata(server, source);
1191
1192 server->fsid = fattr->fsid;
1193
1194 error = nfs_init_server_rpcclient(server,
1195 source->client->cl_timeout,
1196 source->client->cl_auth->au_flavor);
1197 if (error < 0)
1198 goto out_free_server;
1199 if (!IS_ERR(source->client_acl))
1200 nfs_init_server_aclclient(server);
1201
1202 /* probe the filesystem info for this server filesystem */
1203 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1204 if (error < 0)
1205 goto out_free_server;
1206
1207 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1208 server->namelen = NFS4_MAXNAMLEN;
1209
1210 dprintk("Cloned FSID: %llx:%llx\n",
1211 (unsigned long long) server->fsid.major,
1212 (unsigned long long) server->fsid.minor);
1213
1214 error = nfs_start_lockd(server);
1215 if (error < 0)
1216 goto out_free_server;
1217
1218 spin_lock(&nfs_client_lock);
1219 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1220 list_add_tail(&server->master_link, &nfs_volume_list);
1221 spin_unlock(&nfs_client_lock);
1222
1223 server->mount_time = jiffies;
1224
1225 dprintk("<-- nfs_clone_server() = %p\n", server);
1226 return server;
1227
1228 out_free_server:
1229 nfs_free_server(server);
1230 dprintk("<-- nfs_clone_server() = error %d\n", error);
1231 return ERR_PTR(error);
1232 }
1233
1234 #ifdef CONFIG_PROC_FS
1235 static struct proc_dir_entry *proc_fs_nfs;
1236
1237 static int nfs_server_list_open(struct inode *inode, struct file *file);
1238 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1239 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1240 static void nfs_server_list_stop(struct seq_file *p, void *v);
1241 static int nfs_server_list_show(struct seq_file *m, void *v);
1242
1243 static struct seq_operations nfs_server_list_ops = {
1244 .start = nfs_server_list_start,
1245 .next = nfs_server_list_next,
1246 .stop = nfs_server_list_stop,
1247 .show = nfs_server_list_show,
1248 };
1249
1250 static const struct file_operations nfs_server_list_fops = {
1251 .open = nfs_server_list_open,
1252 .read = seq_read,
1253 .llseek = seq_lseek,
1254 .release = seq_release,
1255 };
1256
1257 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1258 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1259 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1260 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1261 static int nfs_volume_list_show(struct seq_file *m, void *v);
1262
1263 static struct seq_operations nfs_volume_list_ops = {
1264 .start = nfs_volume_list_start,
1265 .next = nfs_volume_list_next,
1266 .stop = nfs_volume_list_stop,
1267 .show = nfs_volume_list_show,
1268 };
1269
1270 static const struct file_operations nfs_volume_list_fops = {
1271 .open = nfs_volume_list_open,
1272 .read = seq_read,
1273 .llseek = seq_lseek,
1274 .release = seq_release,
1275 };
1276
1277 /*
1278 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1279 * we're dealing
1280 */
1281 static int nfs_server_list_open(struct inode *inode, struct file *file)
1282 {
1283 struct seq_file *m;
1284 int ret;
1285
1286 ret = seq_open(file, &nfs_server_list_ops);
1287 if (ret < 0)
1288 return ret;
1289
1290 m = file->private_data;
1291 m->private = PDE(inode)->data;
1292
1293 return 0;
1294 }
1295
1296 /*
1297 * set up the iterator to start reading from the server list and return the first item
1298 */
1299 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1300 {
1301 /* lock the list against modification */
1302 spin_lock(&nfs_client_lock);
1303 return seq_list_start_head(&nfs_client_list, *_pos);
1304 }
1305
1306 /*
1307 * move to next server
1308 */
1309 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1310 {
1311 return seq_list_next(v, &nfs_client_list, pos);
1312 }
1313
1314 /*
1315 * clean up after reading from the transports list
1316 */
1317 static void nfs_server_list_stop(struct seq_file *p, void *v)
1318 {
1319 spin_unlock(&nfs_client_lock);
1320 }
1321
1322 /*
1323 * display a header line followed by a load of call lines
1324 */
1325 static int nfs_server_list_show(struct seq_file *m, void *v)
1326 {
1327 struct nfs_client *clp;
1328
1329 /* display header on line 1 */
1330 if (v == &nfs_client_list) {
1331 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1332 return 0;
1333 }
1334
1335 /* display one transport per line on subsequent lines */
1336 clp = list_entry(v, struct nfs_client, cl_share_link);
1337
1338 seq_printf(m, "v%u %s %s %3d %s\n",
1339 clp->rpc_ops->version,
1340 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1341 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1342 atomic_read(&clp->cl_count),
1343 clp->cl_hostname);
1344
1345 return 0;
1346 }
1347
1348 /*
1349 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1350 */
1351 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1352 {
1353 struct seq_file *m;
1354 int ret;
1355
1356 ret = seq_open(file, &nfs_volume_list_ops);
1357 if (ret < 0)
1358 return ret;
1359
1360 m = file->private_data;
1361 m->private = PDE(inode)->data;
1362
1363 return 0;
1364 }
1365
1366 /*
1367 * set up the iterator to start reading from the volume list and return the first item
1368 */
1369 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1370 {
1371 /* lock the list against modification */
1372 spin_lock(&nfs_client_lock);
1373 return seq_list_start_head(&nfs_volume_list, *_pos);
1374 }
1375
1376 /*
1377 * move to next volume
1378 */
1379 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1380 {
1381 return seq_list_next(v, &nfs_volume_list, pos);
1382 }
1383
1384 /*
1385 * clean up after reading from the transports list
1386 */
1387 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1388 {
1389 spin_unlock(&nfs_client_lock);
1390 }
1391
1392 /*
1393 * display a header line followed by a load of call lines
1394 */
1395 static int nfs_volume_list_show(struct seq_file *m, void *v)
1396 {
1397 struct nfs_server *server;
1398 struct nfs_client *clp;
1399 char dev[8], fsid[17];
1400
1401 /* display header on line 1 */
1402 if (v == &nfs_volume_list) {
1403 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1404 return 0;
1405 }
1406 /* display one transport per line on subsequent lines */
1407 server = list_entry(v, struct nfs_server, master_link);
1408 clp = server->nfs_client;
1409
1410 snprintf(dev, 8, "%u:%u",
1411 MAJOR(server->s_dev), MINOR(server->s_dev));
1412
1413 snprintf(fsid, 17, "%llx:%llx",
1414 (unsigned long long) server->fsid.major,
1415 (unsigned long long) server->fsid.minor);
1416
1417 seq_printf(m, "v%u %s %s %-7s %-17s\n",
1418 clp->rpc_ops->version,
1419 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1420 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1421 dev,
1422 fsid);
1423
1424 return 0;
1425 }
1426
1427 /*
1428 * initialise the /proc/fs/nfsfs/ directory
1429 */
1430 int __init nfs_fs_proc_init(void)
1431 {
1432 struct proc_dir_entry *p;
1433
1434 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
1435 if (!proc_fs_nfs)
1436 goto error_0;
1437
1438 proc_fs_nfs->owner = THIS_MODULE;
1439
1440 /* a file of servers with which we're dealing */
1441 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs);
1442 if (!p)
1443 goto error_1;
1444
1445 p->proc_fops = &nfs_server_list_fops;
1446 p->owner = THIS_MODULE;
1447
1448 /* a file of volumes that we have mounted */
1449 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
1450 if (!p)
1451 goto error_2;
1452
1453 p->proc_fops = &nfs_volume_list_fops;
1454 p->owner = THIS_MODULE;
1455 return 0;
1456
1457 error_2:
1458 remove_proc_entry("servers", proc_fs_nfs);
1459 error_1:
1460 remove_proc_entry("nfsfs", proc_root_fs);
1461 error_0:
1462 return -ENOMEM;
1463 }
1464
1465 /*
1466 * clean up the /proc/fs/nfsfs/ directory
1467 */
1468 void nfs_fs_proc_exit(void)
1469 {
1470 remove_proc_entry("volumes", proc_fs_nfs);
1471 remove_proc_entry("servers", proc_fs_nfs);
1472 remove_proc_entry("nfsfs", proc_root_fs);
1473 }
1474
1475 #endif /* CONFIG_PROC_FS */
Linux kernel - Deliverables
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