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Merge git://git.linux-nfs.org/pub/linux/nfs-2.6
[deliverable/linux.git] / fs / nfs / client.c
1 /* client.c: NFS client sharing and management code
2 *
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/sched.h>
16 #include <linux/time.h>
17 #include <linux/kernel.h>
18 #include <linux/mm.h>
19 #include <linux/string.h>
20 #include <linux/stat.h>
21 #include <linux/errno.h>
22 #include <linux/unistd.h>
23 #include <linux/sunrpc/clnt.h>
24 #include <linux/sunrpc/stats.h>
25 #include <linux/sunrpc/metrics.h>
26 #include <linux/sunrpc/xprtsock.h>
27 #include <linux/sunrpc/xprtrdma.h>
28 #include <linux/nfs_fs.h>
29 #include <linux/nfs_mount.h>
30 #include <linux/nfs4_mount.h>
31 #include <linux/lockd/bind.h>
32 #include <linux/seq_file.h>
33 #include <linux/mount.h>
34 #include <linux/nfs_idmap.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/in6.h>
38 #include <net/ipv6.h>
39 #include <linux/nfs_xdr.h>
40
41 #include <asm/system.h>
42
43 #include "nfs4_fs.h"
44 #include "callback.h"
45 #include "delegation.h"
46 #include "iostat.h"
47 #include "internal.h"
48
49 #define NFSDBG_FACILITY NFSDBG_CLIENT
50
51 static DEFINE_SPINLOCK(nfs_client_lock);
52 static LIST_HEAD(nfs_client_list);
53 static LIST_HEAD(nfs_volume_list);
54 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
55
56 /*
57 * RPC cruft for NFS
58 */
59 static struct rpc_version *nfs_version[5] = {
60 [2] = &nfs_version2,
61 #ifdef CONFIG_NFS_V3
62 [3] = &nfs_version3,
63 #endif
64 #ifdef CONFIG_NFS_V4
65 [4] = &nfs_version4,
66 #endif
67 };
68
69 struct rpc_program nfs_program = {
70 .name = "nfs",
71 .number = NFS_PROGRAM,
72 .nrvers = ARRAY_SIZE(nfs_version),
73 .version = nfs_version,
74 .stats = &nfs_rpcstat,
75 .pipe_dir_name = "/nfs",
76 };
77
78 struct rpc_stat nfs_rpcstat = {
79 .program = &nfs_program
80 };
81
82
83 #ifdef CONFIG_NFS_V3_ACL
84 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
85 static struct rpc_version * nfsacl_version[] = {
86 [3] = &nfsacl_version3,
87 };
88
89 struct rpc_program nfsacl_program = {
90 .name = "nfsacl",
91 .number = NFS_ACL_PROGRAM,
92 .nrvers = ARRAY_SIZE(nfsacl_version),
93 .version = nfsacl_version,
94 .stats = &nfsacl_rpcstat,
95 };
96 #endif /* CONFIG_NFS_V3_ACL */
97
98 struct nfs_client_initdata {
99 const char *hostname;
100 const struct sockaddr *addr;
101 size_t addrlen;
102 const struct nfs_rpc_ops *rpc_ops;
103 int proto;
104 };
105
106 /*
107 * Allocate a shared client record
108 *
109 * Since these are allocated/deallocated very rarely, we don't
110 * bother putting them in a slab cache...
111 */
112 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
113 {
114 struct nfs_client *clp;
115
116 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
117 goto error_0;
118
119 clp->rpc_ops = cl_init->rpc_ops;
120
121 if (cl_init->rpc_ops->version == 4) {
122 if (nfs_callback_up() < 0)
123 goto error_2;
124 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
125 }
126
127 atomic_set(&clp->cl_count, 1);
128 clp->cl_cons_state = NFS_CS_INITING;
129
130 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
131 clp->cl_addrlen = cl_init->addrlen;
132
133 if (cl_init->hostname) {
134 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
135 if (!clp->cl_hostname)
136 goto error_3;
137 }
138
139 INIT_LIST_HEAD(&clp->cl_superblocks);
140 clp->cl_rpcclient = ERR_PTR(-EINVAL);
141
142 clp->cl_proto = cl_init->proto;
143
144 #ifdef CONFIG_NFS_V4
145 init_rwsem(&clp->cl_sem);
146 INIT_LIST_HEAD(&clp->cl_delegations);
147 spin_lock_init(&clp->cl_lock);
148 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
149 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
150 clp->cl_boot_time = CURRENT_TIME;
151 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
152 #endif
153
154 return clp;
155
156 error_3:
157 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
158 nfs_callback_down();
159 error_2:
160 kfree(clp);
161 error_0:
162 return NULL;
163 }
164
165 static void nfs4_shutdown_client(struct nfs_client *clp)
166 {
167 #ifdef CONFIG_NFS_V4
168 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
169 nfs4_kill_renewd(clp);
170 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
171 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
172 nfs_idmap_delete(clp);
173 #endif
174 }
175
176 /*
177 * Destroy a shared client record
178 */
179 static void nfs_free_client(struct nfs_client *clp)
180 {
181 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
182
183 nfs4_shutdown_client(clp);
184
185 /* -EIO all pending I/O */
186 if (!IS_ERR(clp->cl_rpcclient))
187 rpc_shutdown_client(clp->cl_rpcclient);
188
189 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
190 nfs_callback_down();
191
192 kfree(clp->cl_hostname);
193 kfree(clp);
194
195 dprintk("<-- nfs_free_client()\n");
196 }
197
198 /*
199 * Release a reference to a shared client record
200 */
201 void nfs_put_client(struct nfs_client *clp)
202 {
203 if (!clp)
204 return;
205
206 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
207
208 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
209 list_del(&clp->cl_share_link);
210 spin_unlock(&nfs_client_lock);
211
212 BUG_ON(!list_empty(&clp->cl_superblocks));
213
214 nfs_free_client(clp);
215 }
216 }
217
218 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
219 const struct sockaddr_in *sa2)
220 {
221 return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
222 }
223
224 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr_in6 *sa1,
225 const struct sockaddr_in6 *sa2)
226 {
227 return ipv6_addr_equal(&sa1->sin6_addr, &sa2->sin6_addr);
228 }
229
230 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
231 const struct sockaddr *sa2)
232 {
233 switch (sa1->sa_family) {
234 case AF_INET:
235 return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
236 (const struct sockaddr_in *)sa2);
237 case AF_INET6:
238 return nfs_sockaddr_match_ipaddr6((const struct sockaddr_in6 *)sa1,
239 (const struct sockaddr_in6 *)sa2);
240 }
241 BUG();
242 }
243
244 /*
245 * Find a client by IP address and protocol version
246 * - returns NULL if no such client
247 */
248 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
249 {
250 struct nfs_client *clp;
251
252 spin_lock(&nfs_client_lock);
253 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
254 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
255
256 /* Don't match clients that failed to initialise properly */
257 if (clp->cl_cons_state != NFS_CS_READY)
258 continue;
259
260 /* Different NFS versions cannot share the same nfs_client */
261 if (clp->rpc_ops->version != nfsversion)
262 continue;
263
264 if (addr->sa_family != clap->sa_family)
265 continue;
266 /* Match only the IP address, not the port number */
267 if (!nfs_sockaddr_match_ipaddr(addr, clap))
268 continue;
269
270 atomic_inc(&clp->cl_count);
271 spin_unlock(&nfs_client_lock);
272 return clp;
273 }
274 spin_unlock(&nfs_client_lock);
275 return NULL;
276 }
277
278 /*
279 * Find a client by IP address and protocol version
280 * - returns NULL if no such client
281 */
282 struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
283 {
284 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
285 u32 nfsvers = clp->rpc_ops->version;
286
287 spin_lock(&nfs_client_lock);
288 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
289 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
290
291 /* Don't match clients that failed to initialise properly */
292 if (clp->cl_cons_state != NFS_CS_READY)
293 continue;
294
295 /* Different NFS versions cannot share the same nfs_client */
296 if (clp->rpc_ops->version != nfsvers)
297 continue;
298
299 if (sap->sa_family != clap->sa_family)
300 continue;
301 /* Match only the IP address, not the port number */
302 if (!nfs_sockaddr_match_ipaddr(sap, clap))
303 continue;
304
305 atomic_inc(&clp->cl_count);
306 spin_unlock(&nfs_client_lock);
307 return clp;
308 }
309 spin_unlock(&nfs_client_lock);
310 return NULL;
311 }
312
313 /*
314 * Find an nfs_client on the list that matches the initialisation data
315 * that is supplied.
316 */
317 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
318 {
319 struct nfs_client *clp;
320
321 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
322 /* Don't match clients that failed to initialise properly */
323 if (clp->cl_cons_state < 0)
324 continue;
325
326 /* Different NFS versions cannot share the same nfs_client */
327 if (clp->rpc_ops != data->rpc_ops)
328 continue;
329
330 if (clp->cl_proto != data->proto)
331 continue;
332
333 /* Match the full socket address */
334 if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
335 continue;
336
337 atomic_inc(&clp->cl_count);
338 return clp;
339 }
340 return NULL;
341 }
342
343 /*
344 * Look up a client by IP address and protocol version
345 * - creates a new record if one doesn't yet exist
346 */
347 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
348 {
349 struct nfs_client *clp, *new = NULL;
350 int error;
351
352 dprintk("--> nfs_get_client(%s,v%u)\n",
353 cl_init->hostname ?: "", cl_init->rpc_ops->version);
354
355 /* see if the client already exists */
356 do {
357 spin_lock(&nfs_client_lock);
358
359 clp = nfs_match_client(cl_init);
360 if (clp)
361 goto found_client;
362 if (new)
363 goto install_client;
364
365 spin_unlock(&nfs_client_lock);
366
367 new = nfs_alloc_client(cl_init);
368 } while (new);
369
370 return ERR_PTR(-ENOMEM);
371
372 /* install a new client and return with it unready */
373 install_client:
374 clp = new;
375 list_add(&clp->cl_share_link, &nfs_client_list);
376 spin_unlock(&nfs_client_lock);
377 dprintk("--> nfs_get_client() = %p [new]\n", clp);
378 return clp;
379
380 /* found an existing client
381 * - make sure it's ready before returning
382 */
383 found_client:
384 spin_unlock(&nfs_client_lock);
385
386 if (new)
387 nfs_free_client(new);
388
389 error = wait_event_interruptible(nfs_client_active_wq,
390 clp->cl_cons_state != NFS_CS_INITING);
391 if (error < 0) {
392 nfs_put_client(clp);
393 return ERR_PTR(-ERESTARTSYS);
394 }
395
396 if (clp->cl_cons_state < NFS_CS_READY) {
397 error = clp->cl_cons_state;
398 nfs_put_client(clp);
399 return ERR_PTR(error);
400 }
401
402 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
403
404 dprintk("--> nfs_get_client() = %p [share]\n", clp);
405 return clp;
406 }
407
408 /*
409 * Mark a server as ready or failed
410 */
411 static void nfs_mark_client_ready(struct nfs_client *clp, int state)
412 {
413 clp->cl_cons_state = state;
414 wake_up_all(&nfs_client_active_wq);
415 }
416
417 /*
418 * Initialise the timeout values for a connection
419 */
420 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
421 unsigned int timeo, unsigned int retrans)
422 {
423 to->to_initval = timeo * HZ / 10;
424 to->to_retries = retrans;
425 if (!to->to_retries)
426 to->to_retries = 2;
427
428 switch (proto) {
429 case XPRT_TRANSPORT_TCP:
430 case XPRT_TRANSPORT_RDMA:
431 if (to->to_initval == 0)
432 to->to_initval = 60 * HZ;
433 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
434 to->to_initval = NFS_MAX_TCP_TIMEOUT;
435 to->to_increment = to->to_initval;
436 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
437 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
438 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
439 if (to->to_maxval < to->to_initval)
440 to->to_maxval = to->to_initval;
441 to->to_exponential = 0;
442 break;
443 case XPRT_TRANSPORT_UDP:
444 default:
445 if (!to->to_initval)
446 to->to_initval = 11 * HZ / 10;
447 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
448 to->to_initval = NFS_MAX_UDP_TIMEOUT;
449 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
450 to->to_exponential = 1;
451 break;
452 }
453 }
454
455 /*
456 * Create an RPC client handle
457 */
458 static int nfs_create_rpc_client(struct nfs_client *clp,
459 const struct rpc_timeout *timeparms,
460 rpc_authflavor_t flavor,
461 int flags)
462 {
463 struct rpc_clnt *clnt = NULL;
464 struct rpc_create_args args = {
465 .protocol = clp->cl_proto,
466 .address = (struct sockaddr *)&clp->cl_addr,
467 .addrsize = clp->cl_addrlen,
468 .timeout = timeparms,
469 .servername = clp->cl_hostname,
470 .program = &nfs_program,
471 .version = clp->rpc_ops->version,
472 .authflavor = flavor,
473 .flags = flags,
474 };
475
476 if (!IS_ERR(clp->cl_rpcclient))
477 return 0;
478
479 clnt = rpc_create(&args);
480 if (IS_ERR(clnt)) {
481 dprintk("%s: cannot create RPC client. Error = %ld\n",
482 __FUNCTION__, PTR_ERR(clnt));
483 return PTR_ERR(clnt);
484 }
485
486 clp->cl_rpcclient = clnt;
487 return 0;
488 }
489
490 /*
491 * Version 2 or 3 client destruction
492 */
493 static void nfs_destroy_server(struct nfs_server *server)
494 {
495 if (!(server->flags & NFS_MOUNT_NONLM))
496 nlmclnt_done(server->nlm_host);
497 }
498
499 /*
500 * Version 2 or 3 lockd setup
501 */
502 static int nfs_start_lockd(struct nfs_server *server)
503 {
504 struct nlm_host *host;
505 struct nfs_client *clp = server->nfs_client;
506 struct nlmclnt_initdata nlm_init = {
507 .hostname = clp->cl_hostname,
508 .address = (struct sockaddr *)&clp->cl_addr,
509 .addrlen = clp->cl_addrlen,
510 .protocol = server->flags & NFS_MOUNT_TCP ?
511 IPPROTO_TCP : IPPROTO_UDP,
512 .nfs_version = clp->rpc_ops->version,
513 };
514
515 if (nlm_init.nfs_version > 3)
516 return 0;
517 if (server->flags & NFS_MOUNT_NONLM)
518 return 0;
519
520 host = nlmclnt_init(&nlm_init);
521 if (IS_ERR(host))
522 return PTR_ERR(host);
523
524 server->nlm_host = host;
525 server->destroy = nfs_destroy_server;
526 return 0;
527 }
528
529 /*
530 * Initialise an NFSv3 ACL client connection
531 */
532 #ifdef CONFIG_NFS_V3_ACL
533 static void nfs_init_server_aclclient(struct nfs_server *server)
534 {
535 if (server->nfs_client->rpc_ops->version != 3)
536 goto out_noacl;
537 if (server->flags & NFS_MOUNT_NOACL)
538 goto out_noacl;
539
540 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
541 if (IS_ERR(server->client_acl))
542 goto out_noacl;
543
544 /* No errors! Assume that Sun nfsacls are supported */
545 server->caps |= NFS_CAP_ACLS;
546 return;
547
548 out_noacl:
549 server->caps &= ~NFS_CAP_ACLS;
550 }
551 #else
552 static inline void nfs_init_server_aclclient(struct nfs_server *server)
553 {
554 server->flags &= ~NFS_MOUNT_NOACL;
555 server->caps &= ~NFS_CAP_ACLS;
556 }
557 #endif
558
559 /*
560 * Create a general RPC client
561 */
562 static int nfs_init_server_rpcclient(struct nfs_server *server,
563 const struct rpc_timeout *timeo,
564 rpc_authflavor_t pseudoflavour)
565 {
566 struct nfs_client *clp = server->nfs_client;
567
568 server->client = rpc_clone_client(clp->cl_rpcclient);
569 if (IS_ERR(server->client)) {
570 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
571 return PTR_ERR(server->client);
572 }
573
574 memcpy(&server->client->cl_timeout_default,
575 timeo,
576 sizeof(server->client->cl_timeout_default));
577 server->client->cl_timeout = &server->client->cl_timeout_default;
578
579 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
580 struct rpc_auth *auth;
581
582 auth = rpcauth_create(pseudoflavour, server->client);
583 if (IS_ERR(auth)) {
584 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
585 return PTR_ERR(auth);
586 }
587 }
588 server->client->cl_softrtry = 0;
589 if (server->flags & NFS_MOUNT_SOFT)
590 server->client->cl_softrtry = 1;
591
592 server->client->cl_intr = 0;
593 if (server->flags & NFS4_MOUNT_INTR)
594 server->client->cl_intr = 1;
595
596 return 0;
597 }
598
599 /*
600 * Initialise an NFS2 or NFS3 client
601 */
602 static int nfs_init_client(struct nfs_client *clp,
603 const struct rpc_timeout *timeparms,
604 const struct nfs_parsed_mount_data *data)
605 {
606 int error;
607
608 if (clp->cl_cons_state == NFS_CS_READY) {
609 /* the client is already initialised */
610 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
611 return 0;
612 }
613
614 /*
615 * Create a client RPC handle for doing FSSTAT with UNIX auth only
616 * - RFC 2623, sec 2.3.2
617 */
618 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 0);
619 if (error < 0)
620 goto error;
621 nfs_mark_client_ready(clp, NFS_CS_READY);
622 return 0;
623
624 error:
625 nfs_mark_client_ready(clp, error);
626 dprintk("<-- nfs_init_client() = xerror %d\n", error);
627 return error;
628 }
629
630 /*
631 * Create a version 2 or 3 client
632 */
633 static int nfs_init_server(struct nfs_server *server,
634 const struct nfs_parsed_mount_data *data)
635 {
636 struct nfs_client_initdata cl_init = {
637 .hostname = data->nfs_server.hostname,
638 .addr = (const struct sockaddr *)&data->nfs_server.address,
639 .addrlen = data->nfs_server.addrlen,
640 .rpc_ops = &nfs_v2_clientops,
641 .proto = data->nfs_server.protocol,
642 };
643 struct rpc_timeout timeparms;
644 struct nfs_client *clp;
645 int error;
646
647 dprintk("--> nfs_init_server()\n");
648
649 #ifdef CONFIG_NFS_V3
650 if (data->flags & NFS_MOUNT_VER3)
651 cl_init.rpc_ops = &nfs_v3_clientops;
652 #endif
653
654 /* Allocate or find a client reference we can use */
655 clp = nfs_get_client(&cl_init);
656 if (IS_ERR(clp)) {
657 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
658 return PTR_ERR(clp);
659 }
660
661 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
662 data->timeo, data->retrans);
663 error = nfs_init_client(clp, &timeparms, data);
664 if (error < 0)
665 goto error;
666
667 server->nfs_client = clp;
668
669 /* Initialise the client representation from the mount data */
670 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
671
672 if (data->rsize)
673 server->rsize = nfs_block_size(data->rsize, NULL);
674 if (data->wsize)
675 server->wsize = nfs_block_size(data->wsize, NULL);
676
677 server->acregmin = data->acregmin * HZ;
678 server->acregmax = data->acregmax * HZ;
679 server->acdirmin = data->acdirmin * HZ;
680 server->acdirmax = data->acdirmax * HZ;
681
682 /* Start lockd here, before we might error out */
683 error = nfs_start_lockd(server);
684 if (error < 0)
685 goto error;
686
687 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
688 if (error < 0)
689 goto error;
690
691 server->namelen = data->namlen;
692 /* Create a client RPC handle for the NFSv3 ACL management interface */
693 nfs_init_server_aclclient(server);
694 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
695 return 0;
696
697 error:
698 server->nfs_client = NULL;
699 nfs_put_client(clp);
700 dprintk("<-- nfs_init_server() = xerror %d\n", error);
701 return error;
702 }
703
704 /*
705 * Load up the server record from information gained in an fsinfo record
706 */
707 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
708 {
709 unsigned long max_rpc_payload;
710
711 /* Work out a lot of parameters */
712 if (server->rsize == 0)
713 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
714 if (server->wsize == 0)
715 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
716
717 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
718 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
719 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
720 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
721
722 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
723 if (server->rsize > max_rpc_payload)
724 server->rsize = max_rpc_payload;
725 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
726 server->rsize = NFS_MAX_FILE_IO_SIZE;
727 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
728
729 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
730
731 if (server->wsize > max_rpc_payload)
732 server->wsize = max_rpc_payload;
733 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
734 server->wsize = NFS_MAX_FILE_IO_SIZE;
735 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
736 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
737
738 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
739 if (server->dtsize > PAGE_CACHE_SIZE)
740 server->dtsize = PAGE_CACHE_SIZE;
741 if (server->dtsize > server->rsize)
742 server->dtsize = server->rsize;
743
744 if (server->flags & NFS_MOUNT_NOAC) {
745 server->acregmin = server->acregmax = 0;
746 server->acdirmin = server->acdirmax = 0;
747 }
748
749 server->maxfilesize = fsinfo->maxfilesize;
750
751 /* We're airborne Set socket buffersize */
752 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
753 }
754
755 /*
756 * Probe filesystem information, including the FSID on v2/v3
757 */
758 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
759 {
760 struct nfs_fsinfo fsinfo;
761 struct nfs_client *clp = server->nfs_client;
762 int error;
763
764 dprintk("--> nfs_probe_fsinfo()\n");
765
766 if (clp->rpc_ops->set_capabilities != NULL) {
767 error = clp->rpc_ops->set_capabilities(server, mntfh);
768 if (error < 0)
769 goto out_error;
770 }
771
772 fsinfo.fattr = fattr;
773 nfs_fattr_init(fattr);
774 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
775 if (error < 0)
776 goto out_error;
777
778 nfs_server_set_fsinfo(server, &fsinfo);
779 error = bdi_init(&server->backing_dev_info);
780 if (error)
781 goto out_error;
782
783
784 /* Get some general file system info */
785 if (server->namelen == 0) {
786 struct nfs_pathconf pathinfo;
787
788 pathinfo.fattr = fattr;
789 nfs_fattr_init(fattr);
790
791 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
792 server->namelen = pathinfo.max_namelen;
793 }
794
795 dprintk("<-- nfs_probe_fsinfo() = 0\n");
796 return 0;
797
798 out_error:
799 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
800 return error;
801 }
802
803 /*
804 * Copy useful information when duplicating a server record
805 */
806 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
807 {
808 target->flags = source->flags;
809 target->acregmin = source->acregmin;
810 target->acregmax = source->acregmax;
811 target->acdirmin = source->acdirmin;
812 target->acdirmax = source->acdirmax;
813 target->caps = source->caps;
814 }
815
816 /*
817 * Allocate and initialise a server record
818 */
819 static struct nfs_server *nfs_alloc_server(void)
820 {
821 struct nfs_server *server;
822
823 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
824 if (!server)
825 return NULL;
826
827 server->client = server->client_acl = ERR_PTR(-EINVAL);
828
829 /* Zero out the NFS state stuff */
830 INIT_LIST_HEAD(&server->client_link);
831 INIT_LIST_HEAD(&server->master_link);
832
833 init_waitqueue_head(&server->active_wq);
834 atomic_set(&server->active, 0);
835
836 server->io_stats = nfs_alloc_iostats();
837 if (!server->io_stats) {
838 kfree(server);
839 return NULL;
840 }
841
842 return server;
843 }
844
845 /*
846 * Free up a server record
847 */
848 void nfs_free_server(struct nfs_server *server)
849 {
850 dprintk("--> nfs_free_server()\n");
851
852 spin_lock(&nfs_client_lock);
853 list_del(&server->client_link);
854 list_del(&server->master_link);
855 spin_unlock(&nfs_client_lock);
856
857 if (server->destroy != NULL)
858 server->destroy(server);
859
860 if (!IS_ERR(server->client_acl))
861 rpc_shutdown_client(server->client_acl);
862 if (!IS_ERR(server->client))
863 rpc_shutdown_client(server->client);
864
865 nfs_put_client(server->nfs_client);
866
867 nfs_free_iostats(server->io_stats);
868 bdi_destroy(&server->backing_dev_info);
869 kfree(server);
870 nfs_release_automount_timer();
871 dprintk("<-- nfs_free_server()\n");
872 }
873
874 /*
875 * Create a version 2 or 3 volume record
876 * - keyed on server and FSID
877 */
878 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
879 struct nfs_fh *mntfh)
880 {
881 struct nfs_server *server;
882 struct nfs_fattr fattr;
883 int error;
884
885 server = nfs_alloc_server();
886 if (!server)
887 return ERR_PTR(-ENOMEM);
888
889 /* Get a client representation */
890 error = nfs_init_server(server, data);
891 if (error < 0)
892 goto error;
893
894 BUG_ON(!server->nfs_client);
895 BUG_ON(!server->nfs_client->rpc_ops);
896 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
897
898 /* Probe the root fh to retrieve its FSID */
899 error = nfs_probe_fsinfo(server, mntfh, &fattr);
900 if (error < 0)
901 goto error;
902 if (server->nfs_client->rpc_ops->version == 3) {
903 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
904 server->namelen = NFS3_MAXNAMLEN;
905 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
906 server->caps |= NFS_CAP_READDIRPLUS;
907 } else {
908 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
909 server->namelen = NFS2_MAXNAMLEN;
910 }
911
912 if (!(fattr.valid & NFS_ATTR_FATTR)) {
913 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
914 if (error < 0) {
915 dprintk("nfs_create_server: getattr error = %d\n", -error);
916 goto error;
917 }
918 }
919 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
920
921 dprintk("Server FSID: %llx:%llx\n",
922 (unsigned long long) server->fsid.major,
923 (unsigned long long) server->fsid.minor);
924
925 BUG_ON(!server->nfs_client);
926 BUG_ON(!server->nfs_client->rpc_ops);
927 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
928
929 spin_lock(&nfs_client_lock);
930 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
931 list_add_tail(&server->master_link, &nfs_volume_list);
932 spin_unlock(&nfs_client_lock);
933
934 server->mount_time = jiffies;
935 return server;
936
937 error:
938 nfs_free_server(server);
939 return ERR_PTR(error);
940 }
941
942 #ifdef CONFIG_NFS_V4
943 /*
944 * Initialise an NFS4 client record
945 */
946 static int nfs4_init_client(struct nfs_client *clp,
947 const struct rpc_timeout *timeparms,
948 const char *ip_addr,
949 rpc_authflavor_t authflavour)
950 {
951 int error;
952
953 if (clp->cl_cons_state == NFS_CS_READY) {
954 /* the client is initialised already */
955 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
956 return 0;
957 }
958
959 /* Check NFS protocol revision and initialize RPC op vector */
960 clp->rpc_ops = &nfs_v4_clientops;
961
962 error = nfs_create_rpc_client(clp, timeparms, authflavour,
963 RPC_CLNT_CREATE_DISCRTRY);
964 if (error < 0)
965 goto error;
966 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
967
968 error = nfs_idmap_new(clp);
969 if (error < 0) {
970 dprintk("%s: failed to create idmapper. Error = %d\n",
971 __FUNCTION__, error);
972 goto error;
973 }
974 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
975
976 nfs_mark_client_ready(clp, NFS_CS_READY);
977 return 0;
978
979 error:
980 nfs_mark_client_ready(clp, error);
981 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
982 return error;
983 }
984
985 /*
986 * Set up an NFS4 client
987 */
988 static int nfs4_set_client(struct nfs_server *server,
989 const char *hostname,
990 const struct sockaddr *addr,
991 const size_t addrlen,
992 const char *ip_addr,
993 rpc_authflavor_t authflavour,
994 int proto, const struct rpc_timeout *timeparms)
995 {
996 struct nfs_client_initdata cl_init = {
997 .hostname = hostname,
998 .addr = addr,
999 .addrlen = addrlen,
1000 .rpc_ops = &nfs_v4_clientops,
1001 .proto = proto,
1002 };
1003 struct nfs_client *clp;
1004 int error;
1005
1006 dprintk("--> nfs4_set_client()\n");
1007
1008 /* Allocate or find a client reference we can use */
1009 clp = nfs_get_client(&cl_init);
1010 if (IS_ERR(clp)) {
1011 error = PTR_ERR(clp);
1012 goto error;
1013 }
1014 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour);
1015 if (error < 0)
1016 goto error_put;
1017
1018 server->nfs_client = clp;
1019 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1020 return 0;
1021
1022 error_put:
1023 nfs_put_client(clp);
1024 error:
1025 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1026 return error;
1027 }
1028
1029 /*
1030 * Create a version 4 volume record
1031 */
1032 static int nfs4_init_server(struct nfs_server *server,
1033 const struct nfs_parsed_mount_data *data)
1034 {
1035 struct rpc_timeout timeparms;
1036 int error;
1037
1038 dprintk("--> nfs4_init_server()\n");
1039
1040 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1041 data->timeo, data->retrans);
1042
1043 /* Get a client record */
1044 error = nfs4_set_client(server,
1045 data->nfs_server.hostname,
1046 (const struct sockaddr *)&data->nfs_server.address,
1047 data->nfs_server.addrlen,
1048 data->client_address,
1049 data->auth_flavors[0],
1050 data->nfs_server.protocol,
1051 &timeparms);
1052 if (error < 0)
1053 goto error;
1054
1055 /* Initialise the client representation from the mount data */
1056 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1057 server->caps |= NFS_CAP_ATOMIC_OPEN;
1058
1059 if (data->rsize)
1060 server->rsize = nfs_block_size(data->rsize, NULL);
1061 if (data->wsize)
1062 server->wsize = nfs_block_size(data->wsize, NULL);
1063
1064 server->acregmin = data->acregmin * HZ;
1065 server->acregmax = data->acregmax * HZ;
1066 server->acdirmin = data->acdirmin * HZ;
1067 server->acdirmax = data->acdirmax * HZ;
1068
1069 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1070
1071 error:
1072 /* Done */
1073 dprintk("<-- nfs4_init_server() = %d\n", error);
1074 return error;
1075 }
1076
1077 /*
1078 * Create a version 4 volume record
1079 * - keyed on server and FSID
1080 */
1081 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1082 struct nfs_fh *mntfh)
1083 {
1084 struct nfs_fattr fattr;
1085 struct nfs_server *server;
1086 int error;
1087
1088 dprintk("--> nfs4_create_server()\n");
1089
1090 server = nfs_alloc_server();
1091 if (!server)
1092 return ERR_PTR(-ENOMEM);
1093
1094 /* set up the general RPC client */
1095 error = nfs4_init_server(server, data);
1096 if (error < 0)
1097 goto error;
1098
1099 BUG_ON(!server->nfs_client);
1100 BUG_ON(!server->nfs_client->rpc_ops);
1101 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1102
1103 /* Probe the root fh to retrieve its FSID */
1104 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
1105 if (error < 0)
1106 goto error;
1107
1108 dprintk("Server FSID: %llx:%llx\n",
1109 (unsigned long long) server->fsid.major,
1110 (unsigned long long) server->fsid.minor);
1111 dprintk("Mount FH: %d\n", mntfh->size);
1112
1113 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1114 if (error < 0)
1115 goto error;
1116
1117 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1118 server->namelen = NFS4_MAXNAMLEN;
1119
1120 BUG_ON(!server->nfs_client);
1121 BUG_ON(!server->nfs_client->rpc_ops);
1122 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1123
1124 spin_lock(&nfs_client_lock);
1125 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1126 list_add_tail(&server->master_link, &nfs_volume_list);
1127 spin_unlock(&nfs_client_lock);
1128
1129 server->mount_time = jiffies;
1130 dprintk("<-- nfs4_create_server() = %p\n", server);
1131 return server;
1132
1133 error:
1134 nfs_free_server(server);
1135 dprintk("<-- nfs4_create_server() = error %d\n", error);
1136 return ERR_PTR(error);
1137 }
1138
1139 /*
1140 * Create an NFS4 referral server record
1141 */
1142 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1143 struct nfs_fh *mntfh)
1144 {
1145 struct nfs_client *parent_client;
1146 struct nfs_server *server, *parent_server;
1147 struct nfs_fattr fattr;
1148 int error;
1149
1150 dprintk("--> nfs4_create_referral_server()\n");
1151
1152 server = nfs_alloc_server();
1153 if (!server)
1154 return ERR_PTR(-ENOMEM);
1155
1156 parent_server = NFS_SB(data->sb);
1157 parent_client = parent_server->nfs_client;
1158
1159 /* Get a client representation.
1160 * Note: NFSv4 always uses TCP, */
1161 error = nfs4_set_client(server, data->hostname,
1162 data->addr,
1163 data->addrlen,
1164 parent_client->cl_ipaddr,
1165 data->authflavor,
1166 parent_server->client->cl_xprt->prot,
1167 parent_server->client->cl_timeout);
1168 if (error < 0)
1169 goto error;
1170
1171 /* Initialise the client representation from the parent server */
1172 nfs_server_copy_userdata(server, parent_server);
1173 server->caps |= NFS_CAP_ATOMIC_OPEN;
1174
1175 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1176 if (error < 0)
1177 goto error;
1178
1179 BUG_ON(!server->nfs_client);
1180 BUG_ON(!server->nfs_client->rpc_ops);
1181 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1182
1183 /* Probe the root fh to retrieve its FSID and filehandle */
1184 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1185 if (error < 0)
1186 goto error;
1187
1188 /* probe the filesystem info for this server filesystem */
1189 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1190 if (error < 0)
1191 goto error;
1192
1193 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1194 server->namelen = NFS4_MAXNAMLEN;
1195
1196 dprintk("Referral FSID: %llx:%llx\n",
1197 (unsigned long long) server->fsid.major,
1198 (unsigned long long) server->fsid.minor);
1199
1200 spin_lock(&nfs_client_lock);
1201 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1202 list_add_tail(&server->master_link, &nfs_volume_list);
1203 spin_unlock(&nfs_client_lock);
1204
1205 server->mount_time = jiffies;
1206
1207 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1208 return server;
1209
1210 error:
1211 nfs_free_server(server);
1212 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1213 return ERR_PTR(error);
1214 }
1215
1216 #endif /* CONFIG_NFS_V4 */
1217
1218 /*
1219 * Clone an NFS2, NFS3 or NFS4 server record
1220 */
1221 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1222 struct nfs_fh *fh,
1223 struct nfs_fattr *fattr)
1224 {
1225 struct nfs_server *server;
1226 struct nfs_fattr fattr_fsinfo;
1227 int error;
1228
1229 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1230 (unsigned long long) fattr->fsid.major,
1231 (unsigned long long) fattr->fsid.minor);
1232
1233 server = nfs_alloc_server();
1234 if (!server)
1235 return ERR_PTR(-ENOMEM);
1236
1237 /* Copy data from the source */
1238 server->nfs_client = source->nfs_client;
1239 atomic_inc(&server->nfs_client->cl_count);
1240 nfs_server_copy_userdata(server, source);
1241
1242 server->fsid = fattr->fsid;
1243
1244 error = nfs_init_server_rpcclient(server,
1245 source->client->cl_timeout,
1246 source->client->cl_auth->au_flavor);
1247 if (error < 0)
1248 goto out_free_server;
1249 if (!IS_ERR(source->client_acl))
1250 nfs_init_server_aclclient(server);
1251
1252 /* probe the filesystem info for this server filesystem */
1253 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1254 if (error < 0)
1255 goto out_free_server;
1256
1257 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1258 server->namelen = NFS4_MAXNAMLEN;
1259
1260 dprintk("Cloned FSID: %llx:%llx\n",
1261 (unsigned long long) server->fsid.major,
1262 (unsigned long long) server->fsid.minor);
1263
1264 error = nfs_start_lockd(server);
1265 if (error < 0)
1266 goto out_free_server;
1267
1268 spin_lock(&nfs_client_lock);
1269 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1270 list_add_tail(&server->master_link, &nfs_volume_list);
1271 spin_unlock(&nfs_client_lock);
1272
1273 server->mount_time = jiffies;
1274
1275 dprintk("<-- nfs_clone_server() = %p\n", server);
1276 return server;
1277
1278 out_free_server:
1279 nfs_free_server(server);
1280 dprintk("<-- nfs_clone_server() = error %d\n", error);
1281 return ERR_PTR(error);
1282 }
1283
1284 #ifdef CONFIG_PROC_FS
1285 static struct proc_dir_entry *proc_fs_nfs;
1286
1287 static int nfs_server_list_open(struct inode *inode, struct file *file);
1288 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1289 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1290 static void nfs_server_list_stop(struct seq_file *p, void *v);
1291 static int nfs_server_list_show(struct seq_file *m, void *v);
1292
1293 static struct seq_operations nfs_server_list_ops = {
1294 .start = nfs_server_list_start,
1295 .next = nfs_server_list_next,
1296 .stop = nfs_server_list_stop,
1297 .show = nfs_server_list_show,
1298 };
1299
1300 static const struct file_operations nfs_server_list_fops = {
1301 .open = nfs_server_list_open,
1302 .read = seq_read,
1303 .llseek = seq_lseek,
1304 .release = seq_release,
1305 };
1306
1307 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1308 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1309 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1310 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1311 static int nfs_volume_list_show(struct seq_file *m, void *v);
1312
1313 static struct seq_operations nfs_volume_list_ops = {
1314 .start = nfs_volume_list_start,
1315 .next = nfs_volume_list_next,
1316 .stop = nfs_volume_list_stop,
1317 .show = nfs_volume_list_show,
1318 };
1319
1320 static const struct file_operations nfs_volume_list_fops = {
1321 .open = nfs_volume_list_open,
1322 .read = seq_read,
1323 .llseek = seq_lseek,
1324 .release = seq_release,
1325 };
1326
1327 /*
1328 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1329 * we're dealing
1330 */
1331 static int nfs_server_list_open(struct inode *inode, struct file *file)
1332 {
1333 struct seq_file *m;
1334 int ret;
1335
1336 ret = seq_open(file, &nfs_server_list_ops);
1337 if (ret < 0)
1338 return ret;
1339
1340 m = file->private_data;
1341 m->private = PDE(inode)->data;
1342
1343 return 0;
1344 }
1345
1346 /*
1347 * set up the iterator to start reading from the server list and return the first item
1348 */
1349 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1350 {
1351 /* lock the list against modification */
1352 spin_lock(&nfs_client_lock);
1353 return seq_list_start_head(&nfs_client_list, *_pos);
1354 }
1355
1356 /*
1357 * move to next server
1358 */
1359 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1360 {
1361 return seq_list_next(v, &nfs_client_list, pos);
1362 }
1363
1364 /*
1365 * clean up after reading from the transports list
1366 */
1367 static void nfs_server_list_stop(struct seq_file *p, void *v)
1368 {
1369 spin_unlock(&nfs_client_lock);
1370 }
1371
1372 /*
1373 * display a header line followed by a load of call lines
1374 */
1375 static int nfs_server_list_show(struct seq_file *m, void *v)
1376 {
1377 struct nfs_client *clp;
1378
1379 /* display header on line 1 */
1380 if (v == &nfs_client_list) {
1381 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1382 return 0;
1383 }
1384
1385 /* display one transport per line on subsequent lines */
1386 clp = list_entry(v, struct nfs_client, cl_share_link);
1387
1388 seq_printf(m, "v%u %s %s %3d %s\n",
1389 clp->rpc_ops->version,
1390 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1391 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1392 atomic_read(&clp->cl_count),
1393 clp->cl_hostname);
1394
1395 return 0;
1396 }
1397
1398 /*
1399 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1400 */
1401 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1402 {
1403 struct seq_file *m;
1404 int ret;
1405
1406 ret = seq_open(file, &nfs_volume_list_ops);
1407 if (ret < 0)
1408 return ret;
1409
1410 m = file->private_data;
1411 m->private = PDE(inode)->data;
1412
1413 return 0;
1414 }
1415
1416 /*
1417 * set up the iterator to start reading from the volume list and return the first item
1418 */
1419 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1420 {
1421 /* lock the list against modification */
1422 spin_lock(&nfs_client_lock);
1423 return seq_list_start_head(&nfs_volume_list, *_pos);
1424 }
1425
1426 /*
1427 * move to next volume
1428 */
1429 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1430 {
1431 return seq_list_next(v, &nfs_volume_list, pos);
1432 }
1433
1434 /*
1435 * clean up after reading from the transports list
1436 */
1437 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1438 {
1439 spin_unlock(&nfs_client_lock);
1440 }
1441
1442 /*
1443 * display a header line followed by a load of call lines
1444 */
1445 static int nfs_volume_list_show(struct seq_file *m, void *v)
1446 {
1447 struct nfs_server *server;
1448 struct nfs_client *clp;
1449 char dev[8], fsid[17];
1450
1451 /* display header on line 1 */
1452 if (v == &nfs_volume_list) {
1453 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1454 return 0;
1455 }
1456 /* display one transport per line on subsequent lines */
1457 server = list_entry(v, struct nfs_server, master_link);
1458 clp = server->nfs_client;
1459
1460 snprintf(dev, 8, "%u:%u",
1461 MAJOR(server->s_dev), MINOR(server->s_dev));
1462
1463 snprintf(fsid, 17, "%llx:%llx",
1464 (unsigned long long) server->fsid.major,
1465 (unsigned long long) server->fsid.minor);
1466
1467 seq_printf(m, "v%u %s %s %-7s %-17s\n",
1468 clp->rpc_ops->version,
1469 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1470 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1471 dev,
1472 fsid);
1473
1474 return 0;
1475 }
1476
1477 /*
1478 * initialise the /proc/fs/nfsfs/ directory
1479 */
1480 int __init nfs_fs_proc_init(void)
1481 {
1482 struct proc_dir_entry *p;
1483
1484 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
1485 if (!proc_fs_nfs)
1486 goto error_0;
1487
1488 proc_fs_nfs->owner = THIS_MODULE;
1489
1490 /* a file of servers with which we're dealing */
1491 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs);
1492 if (!p)
1493 goto error_1;
1494
1495 p->proc_fops = &nfs_server_list_fops;
1496 p->owner = THIS_MODULE;
1497
1498 /* a file of volumes that we have mounted */
1499 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
1500 if (!p)
1501 goto error_2;
1502
1503 p->proc_fops = &nfs_volume_list_fops;
1504 p->owner = THIS_MODULE;
1505 return 0;
1506
1507 error_2:
1508 remove_proc_entry("servers", proc_fs_nfs);
1509 error_1:
1510 remove_proc_entry("nfsfs", proc_root_fs);
1511 error_0:
1512 return -ENOMEM;
1513 }
1514
1515 /*
1516 * clean up the /proc/fs/nfsfs/ directory
1517 */
1518 void nfs_fs_proc_exit(void)
1519 {
1520 remove_proc_entry("volumes", proc_fs_nfs);
1521 remove_proc_entry("servers", proc_fs_nfs);
1522 remove_proc_entry("nfsfs", proc_root_fs);
1523 }
1524
1525 #endif /* CONFIG_PROC_FS */
Linux kernel - Deliverables
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