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[deliverable/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 (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
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>
0896a725 26#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 27#include <linux/sunrpc/xprtrdma.h>
24c8dbbb
DH		 28#include <linux/nfs_fs.h>
29#include <linux/nfs_mount.h>
30#include <linux/nfs4_mount.h>
31#include <linux/lockd/bind.h>
24c8dbbb
DH		 32#include <linux/seq_file.h>
33#include <linux/mount.h>
34#include <linux/nfs_idmap.h>
35#include <linux/vfs.h>
36#include <linux/inet.h>
37#include <linux/nfs_xdr.h>
38
39#include <asm/system.h>
40
41#include "nfs4_fs.h"
42#include "callback.h"
43#include "delegation.h"
44#include "iostat.h"
45#include "internal.h"
46
47#define NFSDBG_FACILITY NFSDBG_CLIENT
48
49static DEFINE_SPINLOCK(nfs_client_lock);
50static LIST_HEAD(nfs_client_list);
54ceac45 51static LIST_HEAD(nfs_volume_list);
24c8dbbb
DH		 52static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
53
5006a76c
DH		 54/*
55 * RPC cruft for NFS
56 */
57static struct rpc_version *nfs_version[5] = {
58 [2] = &nfs_version2,
59#ifdef CONFIG_NFS_V3
60 [3] = &nfs_version3,
61#endif
62#ifdef CONFIG_NFS_V4
63 [4] = &nfs_version4,
64#endif
65};
66
67struct rpc_program nfs_program = {
68 .name = "nfs",
69 .number = NFS_PROGRAM,
70 .nrvers = ARRAY_SIZE(nfs_version),
71 .version = nfs_version,
72 .stats = &nfs_rpcstat,
73 .pipe_dir_name = "/nfs",
74};
75
76struct rpc_stat nfs_rpcstat = {
77 .program = &nfs_program
78};
79
80
81#ifdef CONFIG_NFS_V3_ACL
82static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
83static struct rpc_version * nfsacl_version[] = {
84 [3] = &nfsacl_version3,
85};
86
87struct rpc_program nfsacl_program = {
88 .name = "nfsacl",
89 .number = NFS_ACL_PROGRAM,
90 .nrvers = ARRAY_SIZE(nfsacl_version),
91 .version = nfsacl_version,
92 .stats = &nfsacl_rpcstat,
93};
94#endif /* CONFIG_NFS_V3_ACL */
95
24c8dbbb
DH		 96/*
97 * Allocate a shared client record
98 *
99 * Since these are allocated/deallocated very rarely, we don't
100 * bother putting them in a slab cache...
101 */
102static struct nfs_client *nfs_alloc_client(const char *hostname,
103 const struct sockaddr_in *addr,
104 int nfsversion)
105{
106 struct nfs_client *clp;
24c8dbbb
DH		 107
108 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
109 goto error_0;
110
24c8dbbb
DH		 111 if (nfsversion == 4) {
112 if (nfs_callback_up() < 0)
113 goto error_2;
114 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
115 }
116
117 atomic_set(&clp->cl_count, 1);
118 clp->cl_cons_state = NFS_CS_INITING;
119
120 clp->cl_nfsversion = nfsversion;
121 memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr));
122
123 if (hostname) {
124 clp->cl_hostname = kstrdup(hostname, GFP_KERNEL);
125 if (!clp->cl_hostname)
126 goto error_3;
127 }
128
129 INIT_LIST_HEAD(&clp->cl_superblocks);
130 clp->cl_rpcclient = ERR_PTR(-EINVAL);
131
132#ifdef CONFIG_NFS_V4
133 init_rwsem(&clp->cl_sem);
134 INIT_LIST_HEAD(&clp->cl_delegations);
24c8dbbb 135 spin_lock_init(&clp->cl_lock);
65f27f38 136 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
24c8dbbb
DH		 137 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
138 clp->cl_boot_time = CURRENT_TIME;
139 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
140#endif
141
142 return clp;
143
144error_3:
9c5bf38d
TM		 145 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
146 nfs_callback_down();
24c8dbbb 147error_2:
24c8dbbb
DH		 148 kfree(clp);
149error_0:
150 return NULL;
151}
152
5dd3177a
TM		 153static void nfs4_shutdown_client(struct nfs_client *clp)
154{
155#ifdef CONFIG_NFS_V4
156 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
157 nfs4_kill_renewd(clp);
9f958ab8 158 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
5dd3177a
TM		 159 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
160 nfs_idmap_delete(clp);
161#endif
162}
163
24c8dbbb
DH		 164/*
165 * Destroy a shared client record
166 */
167static void nfs_free_client(struct nfs_client *clp)
168{
169 dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion);
170
5dd3177a 171 nfs4_shutdown_client(clp);
24c8dbbb
DH		 172
173 /* -EIO all pending I/O */
174 if (!IS_ERR(clp->cl_rpcclient))
175 rpc_shutdown_client(clp->cl_rpcclient);
176
177 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
178 nfs_callback_down();
179
24c8dbbb
DH		 180 kfree(clp->cl_hostname);
181 kfree(clp);
182
183 dprintk("<-- nfs_free_client()\n");
184}
185
186/*
187 * Release a reference to a shared client record
188 */
189void nfs_put_client(struct nfs_client *clp)
190{
27ba8512
DH		 191 if (!clp)
192 return;
193
24c8dbbb
DH		 194 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
195
196 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
197 list_del(&clp->cl_share_link);
198 spin_unlock(&nfs_client_lock);
199
200 BUG_ON(!list_empty(&clp->cl_superblocks));
201
202 nfs_free_client(clp);
203 }
204}
205
206/*
207 * Find a client by address
208 * - caller must hold nfs_client_lock
209 */
13bbc06a 210static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion, int match_port)
24c8dbbb
DH		 211{
212 struct nfs_client *clp;
213
214 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
13bbc06a
TM		 215 /* Don't match clients that failed to initialise properly */
216 if (clp->cl_cons_state < 0)
217 continue;
218
24c8dbbb
DH		 219 /* Different NFS versions cannot share the same nfs_client */
220 if (clp->cl_nfsversion != nfsversion)
221 continue;
222
223 if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr,
224 sizeof(clp->cl_addr.sin_addr)) != 0)
225 continue;
226
13bbc06a 227 if (!match_port || clp->cl_addr.sin_port == addr->sin_port)
24c8dbbb
DH		 228 goto found;
229 }
230
231 return NULL;
232
233found:
234 atomic_inc(&clp->cl_count);
235 return clp;
236}
237
238/*
239 * Find a client by IP address and protocol version
240 * - returns NULL if no such client
241 */
242struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
243{
244 struct nfs_client *clp;
245
246 spin_lock(&nfs_client_lock);
13bbc06a 247 clp = __nfs_find_client(addr, nfsversion, 0);
24c8dbbb 248 spin_unlock(&nfs_client_lock);
13bbc06a
TM		 249 if (clp != NULL && clp->cl_cons_state != NFS_CS_READY) {
250 nfs_put_client(clp);
251 clp = NULL;
252 }
24c8dbbb
DH		 253 return clp;
254}
255
256/*
257 * Look up a client by IP address and protocol version
258 * - creates a new record if one doesn't yet exist
259 */
54ceac45
DH		 260static struct nfs_client *nfs_get_client(const char *hostname,
261 const struct sockaddr_in *addr,
262 int nfsversion)
24c8dbbb
DH		 263{
264 struct nfs_client *clp, *new = NULL;
265 int error;
266
267 dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n",
268 hostname ?: "", NIPQUAD(addr->sin_addr),
269 addr->sin_port, nfsversion);
270
271 /* see if the client already exists */
272 do {
273 spin_lock(&nfs_client_lock);
274
13bbc06a 275 clp = __nfs_find_client(addr, nfsversion, 1);
24c8dbbb
DH		 276 if (clp)
277 goto found_client;
278 if (new)
279 goto install_client;
280
281 spin_unlock(&nfs_client_lock);
282
283 new = nfs_alloc_client(hostname, addr, nfsversion);
284 } while (new);
285
286 return ERR_PTR(-ENOMEM);
287
288 /* install a new client and return with it unready */
289install_client:
290 clp = new;
291 list_add(&clp->cl_share_link, &nfs_client_list);
292 spin_unlock(&nfs_client_lock);
293 dprintk("--> nfs_get_client() = %p [new]\n", clp);
294 return clp;
295
296 /* found an existing client
297 * - make sure it's ready before returning
298 */
299found_client:
300 spin_unlock(&nfs_client_lock);
301
302 if (new)
303 nfs_free_client(new);
304
83250493 305 error = wait_event_interruptible(nfs_client_active_wq,
0bae89ec
TM		 306 clp->cl_cons_state != NFS_CS_INITING);
307 if (error < 0) {
308 nfs_put_client(clp);
309 return ERR_PTR(-ERESTARTSYS);
24c8dbbb
DH		 310 }
311
312 if (clp->cl_cons_state < NFS_CS_READY) {
313 error = clp->cl_cons_state;
314 nfs_put_client(clp);
315 return ERR_PTR(error);
316 }
317
54ceac45
DH		 318 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
319
24c8dbbb
DH		 320 dprintk("--> nfs_get_client() = %p [share]\n", clp);
321 return clp;
322}
323
324/*
325 * Mark a server as ready or failed
326 */
54ceac45 327static void nfs_mark_client_ready(struct nfs_client *clp, int state)
24c8dbbb
DH		 328{
329 clp->cl_cons_state = state;
330 wake_up_all(&nfs_client_active_wq);
331}
5006a76c
DH		 332
333/*
334 * Initialise the timeout values for a connection
335 */
336static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
337 unsigned int timeo, unsigned int retrans)
338{
339 to->to_initval = timeo * HZ / 10;
340 to->to_retries = retrans;
341 if (!to->to_retries)
342 to->to_retries = 2;
343
344 switch (proto) {
0896a725 345 case XPRT_TRANSPORT_TCP:
2cf7ff7a 346 case XPRT_TRANSPORT_RDMA:
5006a76c
DH		 347 if (!to->to_initval)
348 to->to_initval = 60 * HZ;
349 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
350 to->to_initval = NFS_MAX_TCP_TIMEOUT;
351 to->to_increment = to->to_initval;
352 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
353 to->to_exponential = 0;
354 break;
0896a725 355 case XPRT_TRANSPORT_UDP:
5006a76c
DH		 356 default:
357 if (!to->to_initval)
358 to->to_initval = 11 * HZ / 10;
359 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
360 to->to_initval = NFS_MAX_UDP_TIMEOUT;
361 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
362 to->to_exponential = 1;
363 break;
364 }
365}
366
367/*
368 * Create an RPC client handle
369 */
54ceac45
DH		 370static int nfs_create_rpc_client(struct nfs_client *clp, int proto,
371 unsigned int timeo,
372 unsigned int retrans,
43d78ef2
CL		 373 rpc_authflavor_t flavor,
374 int flags)
5006a76c
DH		 375{
376 struct rpc_timeout timeparms;
5006a76c 377 struct rpc_clnt *clnt = NULL;
41877d20
CL		 378 struct rpc_create_args args = {
379 .protocol = proto,
380 .address = (struct sockaddr *)&clp->cl_addr,
381 .addrsize = sizeof(clp->cl_addr),
382 .timeout = &timeparms,
383 .servername = clp->cl_hostname,
384 .program = &nfs_program,
385 .version = clp->rpc_ops->version,
386 .authflavor = flavor,
43d78ef2 387 .flags = flags,
41877d20 388 };
5006a76c
DH		 389
390 if (!IS_ERR(clp->cl_rpcclient))
391 return 0;
392
393 nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
394 clp->retrans_timeo = timeparms.to_initval;
395 clp->retrans_count = timeparms.to_retries;
396
41877d20 397 clnt = rpc_create(&args);
5006a76c
DH		 398 if (IS_ERR(clnt)) {
399 dprintk("%s: cannot create RPC client. Error = %ld\n",
400 __FUNCTION__, PTR_ERR(clnt));
401 return PTR_ERR(clnt);
402 }
403
5006a76c
DH		 404 clp->cl_rpcclient = clnt;
405 return 0;
406}
54ceac45
DH		 407
408/*
409 * Version 2 or 3 client destruction
410 */
411static void nfs_destroy_server(struct nfs_server *server)
412{
413 if (!IS_ERR(server->client_acl))
414 rpc_shutdown_client(server->client_acl);
415
416 if (!(server->flags & NFS_MOUNT_NONLM))
417 lockd_down(); /* release rpc.lockd */
418}
419
420/*
421 * Version 2 or 3 lockd setup
422 */
423static int nfs_start_lockd(struct nfs_server *server)
424{
425 int error = 0;
426
427 if (server->nfs_client->cl_nfsversion > 3)
428 goto out;
429 if (server->flags & NFS_MOUNT_NONLM)
430 goto out;
24e36663
N		 431 error = lockd_up((server->flags & NFS_MOUNT_TCP) ?
432 IPPROTO_TCP : IPPROTO_UDP);
54ceac45
DH		 433 if (error < 0)
434 server->flags |= NFS_MOUNT_NONLM;
435 else
436 server->destroy = nfs_destroy_server;
437out:
438 return error;
439}
440
441/*
442 * Initialise an NFSv3 ACL client connection
443 */
444#ifdef CONFIG_NFS_V3_ACL
445static void nfs_init_server_aclclient(struct nfs_server *server)
446{
447 if (server->nfs_client->cl_nfsversion != 3)
448 goto out_noacl;
449 if (server->flags & NFS_MOUNT_NOACL)
450 goto out_noacl;
451
452 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
453 if (IS_ERR(server->client_acl))
454 goto out_noacl;
455
456 /* No errors! Assume that Sun nfsacls are supported */
457 server->caps |= NFS_CAP_ACLS;
458 return;
459
460out_noacl:
461 server->caps &= ~NFS_CAP_ACLS;
462}
463#else
464static inline void nfs_init_server_aclclient(struct nfs_server *server)
465{
466 server->flags &= ~NFS_MOUNT_NOACL;
467 server->caps &= ~NFS_CAP_ACLS;
468}
469#endif
470
471/*
472 * Create a general RPC client
473 */
474static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour)
475{
476 struct nfs_client *clp = server->nfs_client;
477
478 server->client = rpc_clone_client(clp->cl_rpcclient);
479 if (IS_ERR(server->client)) {
480 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
481 return PTR_ERR(server->client);
482 }
483
484 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
485 struct rpc_auth *auth;
486
487 auth = rpcauth_create(pseudoflavour, server->client);
488 if (IS_ERR(auth)) {
489 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
490 return PTR_ERR(auth);
491 }
492 }
493 server->client->cl_softrtry = 0;
494 if (server->flags & NFS_MOUNT_SOFT)
495 server->client->cl_softrtry = 1;
496
497 server->client->cl_intr = 0;
498 if (server->flags & NFS4_MOUNT_INTR)
499 server->client->cl_intr = 1;
500
501 return 0;
502}
503
504/*
505 * Initialise an NFS2 or NFS3 client
506 */
2283f8d6
TT		 507static int nfs_init_client(struct nfs_client *clp,
508 const struct nfs_parsed_mount_data *data)
54ceac45 509{
54ceac45
DH		 510 int error;
511
512 if (clp->cl_cons_state == NFS_CS_READY) {
513 /* the client is already initialised */
514 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
515 return 0;
516 }
517
518 /* Check NFS protocol revision and initialize RPC op vector */
519 clp->rpc_ops = &nfs_v2_clientops;
520#ifdef CONFIG_NFS_V3
521 if (clp->cl_nfsversion == 3)
522 clp->rpc_ops = &nfs_v3_clientops;
523#endif
524 /*
525 * Create a client RPC handle for doing FSSTAT with UNIX auth only
526 * - RFC 2623, sec 2.3.2
527 */
2283f8d6
TT		 528 error = nfs_create_rpc_client(clp, data->nfs_server.protocol,
529 data->timeo, data->retrans, RPC_AUTH_UNIX, 0);
54ceac45
DH		 530 if (error < 0)
531 goto error;
532 nfs_mark_client_ready(clp, NFS_CS_READY);
533 return 0;
534
535error:
536 nfs_mark_client_ready(clp, error);
537 dprintk("<-- nfs_init_client() = xerror %d\n", error);
538 return error;
539}
540
541/*
542 * Create a version 2 or 3 client
543 */
2283f8d6
TT		 544static int nfs_init_server(struct nfs_server *server,
545 const struct nfs_parsed_mount_data *data)
54ceac45
DH		 546{
547 struct nfs_client *clp;
548 int error, nfsvers = 2;
549
550 dprintk("--> nfs_init_server()\n");
551
552#ifdef CONFIG_NFS_V3
553 if (data->flags & NFS_MOUNT_VER3)
554 nfsvers = 3;
555#endif
556
557 /* Allocate or find a client reference we can use */
2283f8d6
TT		 558 clp = nfs_get_client(data->nfs_server.hostname,
559 &data->nfs_server.address, nfsvers);
54ceac45
DH		 560 if (IS_ERR(clp)) {
561 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
562 return PTR_ERR(clp);
563 }
564
565 error = nfs_init_client(clp, data);
566 if (error < 0)
567 goto error;
568
569 server->nfs_client = clp;
570
571 /* Initialise the client representation from the mount data */
572 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
573
574 if (data->rsize)
575 server->rsize = nfs_block_size(data->rsize, NULL);
576 if (data->wsize)
577 server->wsize = nfs_block_size(data->wsize, NULL);
578
579 server->acregmin = data->acregmin * HZ;
580 server->acregmax = data->acregmax * HZ;
581 server->acdirmin = data->acdirmin * HZ;
582 server->acdirmax = data->acdirmax * HZ;
583
584 /* Start lockd here, before we might error out */
585 error = nfs_start_lockd(server);
586 if (error < 0)
587 goto error;
588
2283f8d6 589 error = nfs_init_server_rpcclient(server, data->auth_flavors[0]);
54ceac45
DH		 590 if (error < 0)
591 goto error;
592
593 server->namelen = data->namlen;
594 /* Create a client RPC handle for the NFSv3 ACL management interface */
595 nfs_init_server_aclclient(server);
54ceac45
DH		 596 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
597 return 0;
598
599error:
600 server->nfs_client = NULL;
601 nfs_put_client(clp);
602 dprintk("<-- nfs_init_server() = xerror %d\n", error);
603 return error;
604}
605
606/*
607 * Load up the server record from information gained in an fsinfo record
608 */
609static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
610{
611 unsigned long max_rpc_payload;
612
613 /* Work out a lot of parameters */
614 if (server->rsize == 0)
615 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
616 if (server->wsize == 0)
617 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
618
619 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
620 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
621 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
622 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
623
624 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
625 if (server->rsize > max_rpc_payload)
626 server->rsize = max_rpc_payload;
627 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
628 server->rsize = NFS_MAX_FILE_IO_SIZE;
629 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
630 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
631
632 if (server->wsize > max_rpc_payload)
633 server->wsize = max_rpc_payload;
634 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
635 server->wsize = NFS_MAX_FILE_IO_SIZE;
636 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
637 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
638
639 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
640 if (server->dtsize > PAGE_CACHE_SIZE)
641 server->dtsize = PAGE_CACHE_SIZE;
642 if (server->dtsize > server->rsize)
643 server->dtsize = server->rsize;
644
645 if (server->flags & NFS_MOUNT_NOAC) {
646 server->acregmin = server->acregmax = 0;
647 server->acdirmin = server->acdirmax = 0;
648 }
649
650 server->maxfilesize = fsinfo->maxfilesize;
651
652 /* We're airborne Set socket buffersize */
653 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
654}
655
656/*
657 * Probe filesystem information, including the FSID on v2/v3
658 */
659static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
660{
661 struct nfs_fsinfo fsinfo;
662 struct nfs_client *clp = server->nfs_client;
663 int error;
664
665 dprintk("--> nfs_probe_fsinfo()\n");
666
667 if (clp->rpc_ops->set_capabilities != NULL) {
668 error = clp->rpc_ops->set_capabilities(server, mntfh);
669 if (error < 0)
670 goto out_error;
671 }
672
673 fsinfo.fattr = fattr;
674 nfs_fattr_init(fattr);
675 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
676 if (error < 0)
677 goto out_error;
678
679 nfs_server_set_fsinfo(server, &fsinfo);
680
681 /* Get some general file system info */
682 if (server->namelen == 0) {
683 struct nfs_pathconf pathinfo;
684
685 pathinfo.fattr = fattr;
686 nfs_fattr_init(fattr);
687
688 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
689 server->namelen = pathinfo.max_namelen;
690 }
691
692 dprintk("<-- nfs_probe_fsinfo() = 0\n");
693 return 0;
694
695out_error:
696 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
697 return error;
698}
699
700/*
701 * Copy useful information when duplicating a server record
702 */
703static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
704{
705 target->flags = source->flags;
706 target->acregmin = source->acregmin;
707 target->acregmax = source->acregmax;
708 target->acdirmin = source->acdirmin;
709 target->acdirmax = source->acdirmax;
710 target->caps = source->caps;
711}
712
713/*
714 * Allocate and initialise a server record
715 */
716static struct nfs_server *nfs_alloc_server(void)
717{
718 struct nfs_server *server;
719
720 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
721 if (!server)
722 return NULL;
723
724 server->client = server->client_acl = ERR_PTR(-EINVAL);
725
726 /* Zero out the NFS state stuff */
727 INIT_LIST_HEAD(&server->client_link);
728 INIT_LIST_HEAD(&server->master_link);
729
730 server->io_stats = nfs_alloc_iostats();
731 if (!server->io_stats) {
732 kfree(server);
733 return NULL;
734 }
735
736 return server;
737}
738
739/*
740 * Free up a server record
741 */
742void nfs_free_server(struct nfs_server *server)
743{
744 dprintk("--> nfs_free_server()\n");
745
746 spin_lock(&nfs_client_lock);
747 list_del(&server->client_link);
748 list_del(&server->master_link);
749 spin_unlock(&nfs_client_lock);
750
751 if (server->destroy != NULL)
752 server->destroy(server);
753 if (!IS_ERR(server->client))
754 rpc_shutdown_client(server->client);
755
756 nfs_put_client(server->nfs_client);
757
758 nfs_free_iostats(server->io_stats);
759 kfree(server);
760 nfs_release_automount_timer();
761 dprintk("<-- nfs_free_server()\n");
762}
763
764/*
765 * Create a version 2 or 3 volume record
766 * - keyed on server and FSID
767 */
2283f8d6 768struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
54ceac45
DH		 769 struct nfs_fh *mntfh)
770{
771 struct nfs_server *server;
772 struct nfs_fattr fattr;
773 int error;
774
775 server = nfs_alloc_server();
776 if (!server)
777 return ERR_PTR(-ENOMEM);
778
779 /* Get a client representation */
780 error = nfs_init_server(server, data);
781 if (error < 0)
782 goto error;
783
784 BUG_ON(!server->nfs_client);
785 BUG_ON(!server->nfs_client->rpc_ops);
786 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
787
788 /* Probe the root fh to retrieve its FSID */
789 error = nfs_probe_fsinfo(server, mntfh, &fattr);
790 if (error < 0)
791 goto error;
54af3bb5
TM		 792 if (server->nfs_client->rpc_ops->version == 3) {
793 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
794 server->namelen = NFS3_MAXNAMLEN;
795 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
796 server->caps |= NFS_CAP_READDIRPLUS;
797 } else {
798 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
799 server->namelen = NFS2_MAXNAMLEN;
800 }
801
54ceac45
DH		 802 if (!(fattr.valid & NFS_ATTR_FATTR)) {
803 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
804 if (error < 0) {
805 dprintk("nfs_create_server: getattr error = %d\n", -error);
806 goto error;
807 }
808 }
809 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
810
6daabf1b
DH		 811 dprintk("Server FSID: %llx:%llx\n",
812 (unsigned long long) server->fsid.major,
813 (unsigned long long) server->fsid.minor);
54ceac45
DH		 814
815 BUG_ON(!server->nfs_client);
816 BUG_ON(!server->nfs_client->rpc_ops);
817 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
818
819 spin_lock(&nfs_client_lock);
820 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
821 list_add_tail(&server->master_link, &nfs_volume_list);
822 spin_unlock(&nfs_client_lock);
823
824 server->mount_time = jiffies;
825 return server;
826
827error:
828 nfs_free_server(server);
829 return ERR_PTR(error);
830}
831
832#ifdef CONFIG_NFS_V4
833/*
834 * Initialise an NFS4 client record
835 */
836static int nfs4_init_client(struct nfs_client *clp,
837 int proto, int timeo, int retrans,
7d9ac06f 838 const char *ip_addr,
54ceac45
DH		 839 rpc_authflavor_t authflavour)
840{
841 int error;
842
843 if (clp->cl_cons_state == NFS_CS_READY) {
844 /* the client is initialised already */
845 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
846 return 0;
847 }
848
849 /* Check NFS protocol revision and initialize RPC op vector */
850 clp->rpc_ops = &nfs_v4_clientops;
851
43d78ef2
CL		 852 error = nfs_create_rpc_client(clp, proto, timeo, retrans, authflavour,
853 RPC_CLNT_CREATE_DISCRTRY);
54ceac45
DH		 854 if (error < 0)
855 goto error;
7d9ac06f 856 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
54ceac45
DH		 857
858 error = nfs_idmap_new(clp);
859 if (error < 0) {
860 dprintk("%s: failed to create idmapper. Error = %d\n",
861 __FUNCTION__, error);
54ceac45
DH		 862 goto error;
863 }
9c5bf38d 864 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
54ceac45
DH		 865
866 nfs_mark_client_ready(clp, NFS_CS_READY);
867 return 0;
868
869error:
870 nfs_mark_client_ready(clp, error);
871 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
872 return error;
873}
874
875/*
876 * Set up an NFS4 client
877 */
878static int nfs4_set_client(struct nfs_server *server,
879 const char *hostname, const struct sockaddr_in *addr,
7d9ac06f 880 const char *ip_addr,
54ceac45
DH		 881 rpc_authflavor_t authflavour,
882 int proto, int timeo, int retrans)
883{
884 struct nfs_client *clp;
885 int error;
886
887 dprintk("--> nfs4_set_client()\n");
888
889 /* Allocate or find a client reference we can use */
890 clp = nfs_get_client(hostname, addr, 4);
891 if (IS_ERR(clp)) {
892 error = PTR_ERR(clp);
893 goto error;
894 }
7d9ac06f 895 error = nfs4_init_client(clp, proto, timeo, retrans, ip_addr, authflavour);
54ceac45
DH		 896 if (error < 0)
897 goto error_put;
898
899 server->nfs_client = clp;
900 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
901 return 0;
902
903error_put:
904 nfs_put_client(clp);
905error:
906 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
907 return error;
908}
909
910/*
911 * Create a version 4 volume record
912 */
913static int nfs4_init_server(struct nfs_server *server,
91ea40b9 914 const struct nfs_parsed_mount_data *data)
54ceac45
DH		 915{
916 int error;
917
918 dprintk("--> nfs4_init_server()\n");
919
920 /* Initialise the client representation from the mount data */
921 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
922 server->caps |= NFS_CAP_ATOMIC_OPEN;
923
924 if (data->rsize)
925 server->rsize = nfs_block_size(data->rsize, NULL);
926 if (data->wsize)
927 server->wsize = nfs_block_size(data->wsize, NULL);
928
929 server->acregmin = data->acregmin * HZ;
930 server->acregmax = data->acregmax * HZ;
931 server->acdirmin = data->acdirmin * HZ;
932 server->acdirmax = data->acdirmax * HZ;
933
91ea40b9 934 error = nfs_init_server_rpcclient(server, data->auth_flavors[0]);
54ceac45
DH		 935
936 /* Done */
937 dprintk("<-- nfs4_init_server() = %d\n", error);
938 return error;
939}
940
941/*
942 * Create a version 4 volume record
943 * - keyed on server and FSID
944 */
91ea40b9 945struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
54ceac45
DH		 946 struct nfs_fh *mntfh)
947{
948 struct nfs_fattr fattr;
949 struct nfs_server *server;
950 int error;
951
952 dprintk("--> nfs4_create_server()\n");
953
954 server = nfs_alloc_server();
955 if (!server)
956 return ERR_PTR(-ENOMEM);
957
958 /* Get a client record */
91ea40b9
TT		 959 error = nfs4_set_client(server,
960 data->nfs_server.hostname,
961 &data->nfs_server.address,
962 data->client_address,
963 data->auth_flavors[0],
964 data->nfs_server.protocol,
965 data->timeo, data->retrans);
54ceac45
DH		 966 if (error < 0)
967 goto error;
968
969 /* set up the general RPC client */
91ea40b9 970 error = nfs4_init_server(server, data);
54ceac45
DH		 971 if (error < 0)
972 goto error;
973
974 BUG_ON(!server->nfs_client);
975 BUG_ON(!server->nfs_client->rpc_ops);
976 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
977
978 /* Probe the root fh to retrieve its FSID */
91ea40b9 979 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
54ceac45
DH		 980 if (error < 0)
981 goto error;
982
6daabf1b
DH		 983 dprintk("Server FSID: %llx:%llx\n",
984 (unsigned long long) server->fsid.major,
985 (unsigned long long) server->fsid.minor);
54ceac45
DH		 986 dprintk("Mount FH: %d\n", mntfh->size);
987
988 error = nfs_probe_fsinfo(server, mntfh, &fattr);
989 if (error < 0)
990 goto error;
991
54af3bb5
TM		 992 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
993 server->namelen = NFS4_MAXNAMLEN;
994
54ceac45
DH		 995 BUG_ON(!server->nfs_client);
996 BUG_ON(!server->nfs_client->rpc_ops);
997 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
998
999 spin_lock(&nfs_client_lock);
1000 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1001 list_add_tail(&server->master_link, &nfs_volume_list);
1002 spin_unlock(&nfs_client_lock);
1003
1004 server->mount_time = jiffies;
1005 dprintk("<-- nfs4_create_server() = %p\n", server);
1006 return server;
1007
1008error:
1009 nfs_free_server(server);
1010 dprintk("<-- nfs4_create_server() = error %d\n", error);
1011 return ERR_PTR(error);
1012}
1013
1014/*
1015 * Create an NFS4 referral server record
1016 */
1017struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
f2d0d85e 1018 struct nfs_fh *mntfh)
54ceac45
DH		 1019{
1020 struct nfs_client *parent_client;
1021 struct nfs_server *server, *parent_server;
1022 struct nfs_fattr fattr;
1023 int error;
1024
1025 dprintk("--> nfs4_create_referral_server()\n");
1026
1027 server = nfs_alloc_server();
1028 if (!server)
1029 return ERR_PTR(-ENOMEM);
1030
1031 parent_server = NFS_SB(data->sb);
1032 parent_client = parent_server->nfs_client;
1033
1034 /* Get a client representation.
1035 * Note: NFSv4 always uses TCP, */
1036 error = nfs4_set_client(server, data->hostname, data->addr,
7d9ac06f 1037 parent_client->cl_ipaddr,
54ceac45
DH		 1038 data->authflavor,
1039 parent_server->client->cl_xprt->prot,
1040 parent_client->retrans_timeo,
1041 parent_client->retrans_count);
297de4f6 1042 if (error < 0)
1043 goto error;
54ceac45
DH		 1044
1045 /* Initialise the client representation from the parent server */
1046 nfs_server_copy_userdata(server, parent_server);
1047 server->caps |= NFS_CAP_ATOMIC_OPEN;
1048
1049 error = nfs_init_server_rpcclient(server, data->authflavor);
1050 if (error < 0)
1051 goto error;
1052
1053 BUG_ON(!server->nfs_client);
1054 BUG_ON(!server->nfs_client->rpc_ops);
1055 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1056
f2d0d85e
TM		 1057 /* Probe the root fh to retrieve its FSID and filehandle */
1058 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1059 if (error < 0)
1060 goto error;
1061
54ceac45 1062 /* probe the filesystem info for this server filesystem */
f2d0d85e 1063 error = nfs_probe_fsinfo(server, mntfh, &fattr);
54ceac45
DH		 1064 if (error < 0)
1065 goto error;
1066
54af3bb5
TM		 1067 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1068 server->namelen = NFS4_MAXNAMLEN;
1069
54ceac45 1070 dprintk("Referral FSID: %llx:%llx\n",
6daabf1b
DH		 1071 (unsigned long long) server->fsid.major,
1072 (unsigned long long) server->fsid.minor);
54ceac45
DH		 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
1081 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1082 return server;
1083
1084error:
1085 nfs_free_server(server);
1086 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1087 return ERR_PTR(error);
1088}
1089
1090#endif /* CONFIG_NFS_V4 */
1091
1092/*
1093 * Clone an NFS2, NFS3 or NFS4 server record
1094 */
1095struct nfs_server *nfs_clone_server(struct nfs_server *source,
1096 struct nfs_fh *fh,
1097 struct nfs_fattr *fattr)
1098{
1099 struct nfs_server *server;
1100 struct nfs_fattr fattr_fsinfo;
1101 int error;
1102
1103 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
6daabf1b
DH		 1104 (unsigned long long) fattr->fsid.major,
1105 (unsigned long long) fattr->fsid.minor);
54ceac45
DH		 1106
1107 server = nfs_alloc_server();
1108 if (!server)
1109 return ERR_PTR(-ENOMEM);
1110
1111 /* Copy data from the source */
1112 server->nfs_client = source->nfs_client;
1113 atomic_inc(&server->nfs_client->cl_count);
1114 nfs_server_copy_userdata(server, source);
1115
1116 server->fsid = fattr->fsid;
1117
1118 error = nfs_init_server_rpcclient(server, source->client->cl_auth->au_flavor);
1119 if (error < 0)
1120 goto out_free_server;
1121 if (!IS_ERR(source->client_acl))
1122 nfs_init_server_aclclient(server);
1123
1124 /* probe the filesystem info for this server filesystem */
1125 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1126 if (error < 0)
1127 goto out_free_server;
1128
54af3bb5
TM		 1129 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1130 server->namelen = NFS4_MAXNAMLEN;
1131
54ceac45 1132 dprintk("Cloned FSID: %llx:%llx\n",
6daabf1b
DH		 1133 (unsigned long long) server->fsid.major,
1134 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1135
1136 error = nfs_start_lockd(server);
1137 if (error < 0)
1138 goto out_free_server;
1139
1140 spin_lock(&nfs_client_lock);
1141 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1142 list_add_tail(&server->master_link, &nfs_volume_list);
1143 spin_unlock(&nfs_client_lock);
1144
1145 server->mount_time = jiffies;
1146
1147 dprintk("<-- nfs_clone_server() = %p\n", server);
1148 return server;
1149
1150out_free_server:
1151 nfs_free_server(server);
1152 dprintk("<-- nfs_clone_server() = error %d\n", error);
1153 return ERR_PTR(error);
1154}
6aaca566
DH		 1155
1156#ifdef CONFIG_PROC_FS
1157static struct proc_dir_entry *proc_fs_nfs;
1158
1159static int nfs_server_list_open(struct inode *inode, struct file *file);
1160static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1161static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1162static void nfs_server_list_stop(struct seq_file *p, void *v);
1163static int nfs_server_list_show(struct seq_file *m, void *v);
1164
1165static struct seq_operations nfs_server_list_ops = {
1166 .start = nfs_server_list_start,
1167 .next = nfs_server_list_next,
1168 .stop = nfs_server_list_stop,
1169 .show = nfs_server_list_show,
1170};
1171
00977a59 1172static const struct file_operations nfs_server_list_fops = {
6aaca566
DH		 1173 .open = nfs_server_list_open,
1174 .read = seq_read,
1175 .llseek = seq_lseek,
1176 .release = seq_release,
1177};
1178
1179static int nfs_volume_list_open(struct inode *inode, struct file *file);
1180static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1181static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1182static void nfs_volume_list_stop(struct seq_file *p, void *v);
1183static int nfs_volume_list_show(struct seq_file *m, void *v);
1184
1185static struct seq_operations nfs_volume_list_ops = {
1186 .start = nfs_volume_list_start,
1187 .next = nfs_volume_list_next,
1188 .stop = nfs_volume_list_stop,
1189 .show = nfs_volume_list_show,
1190};
1191
00977a59 1192static const struct file_operations nfs_volume_list_fops = {
6aaca566
DH		 1193 .open = nfs_volume_list_open,
1194 .read = seq_read,
1195 .llseek = seq_lseek,
1196 .release = seq_release,
1197};
1198
1199/*
1200 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1201 * we're dealing
1202 */
1203static int nfs_server_list_open(struct inode *inode, struct file *file)
1204{
1205 struct seq_file *m;
1206 int ret;
1207
1208 ret = seq_open(file, &nfs_server_list_ops);
1209 if (ret < 0)
1210 return ret;
1211
1212 m = file->private_data;
1213 m->private = PDE(inode)->data;
1214
1215 return 0;
1216}
1217
1218/*
1219 * set up the iterator to start reading from the server list and return the first item
1220 */
1221static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1222{
6aaca566
DH		 1223 /* lock the list against modification */
1224 spin_lock(&nfs_client_lock);
259902ea 1225 return seq_list_start_head(&nfs_client_list, *_pos);
6aaca566
DH		 1226}
1227
1228/*
1229 * move to next server
1230 */
1231static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1232{
259902ea 1233 return seq_list_next(v, &nfs_client_list, pos);
6aaca566
DH		 1234}
1235
1236/*
1237 * clean up after reading from the transports list
1238 */
1239static void nfs_server_list_stop(struct seq_file *p, void *v)
1240{
1241 spin_unlock(&nfs_client_lock);
1242}
1243
1244/*
1245 * display a header line followed by a load of call lines
1246 */
1247static int nfs_server_list_show(struct seq_file *m, void *v)
1248{
1249 struct nfs_client *clp;
1250
1251 /* display header on line 1 */
259902ea 1252 if (v == &nfs_client_list) {
6aaca566
DH		 1253 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1254 return 0;
1255 }
1256
1257 /* display one transport per line on subsequent lines */
1258 clp = list_entry(v, struct nfs_client, cl_share_link);
1259
1260 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %3d %s\n",
1261 clp->cl_nfsversion,
1262 NIPQUAD(clp->cl_addr.sin_addr),
1263 ntohs(clp->cl_addr.sin_port),
1264 atomic_read(&clp->cl_count),
1265 clp->cl_hostname);
1266
1267 return 0;
1268}
1269
1270/*
1271 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1272 */
1273static int nfs_volume_list_open(struct inode *inode, struct file *file)
1274{
1275 struct seq_file *m;
1276 int ret;
1277
1278 ret = seq_open(file, &nfs_volume_list_ops);
1279 if (ret < 0)
1280 return ret;
1281
1282 m = file->private_data;
1283 m->private = PDE(inode)->data;
1284
1285 return 0;
1286}
1287
1288/*
1289 * set up the iterator to start reading from the volume list and return the first item
1290 */
1291static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1292{
6aaca566
DH		 1293 /* lock the list against modification */
1294 spin_lock(&nfs_client_lock);
259902ea 1295 return seq_list_start_head(&nfs_volume_list, *_pos);
6aaca566
DH		 1296}
1297
1298/*
1299 * move to next volume
1300 */
1301static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1302{
259902ea 1303 return seq_list_next(v, &nfs_volume_list, pos);
6aaca566
DH		 1304}
1305
1306/*
1307 * clean up after reading from the transports list
1308 */
1309static void nfs_volume_list_stop(struct seq_file *p, void *v)
1310{
1311 spin_unlock(&nfs_client_lock);
1312}
1313
1314/*
1315 * display a header line followed by a load of call lines
1316 */
1317static int nfs_volume_list_show(struct seq_file *m, void *v)
1318{
1319 struct nfs_server *server;
1320 struct nfs_client *clp;
1321 char dev[8], fsid[17];
1322
1323 /* display header on line 1 */
259902ea 1324 if (v == &nfs_volume_list) {
6aaca566
DH		 1325 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1326 return 0;
1327 }
1328 /* display one transport per line on subsequent lines */
1329 server = list_entry(v, struct nfs_server, master_link);
1330 clp = server->nfs_client;
1331
1332 snprintf(dev, 8, "%u:%u",
1333 MAJOR(server->s_dev), MINOR(server->s_dev));
1334
1335 snprintf(fsid, 17, "%llx:%llx",
6daabf1b
DH		 1336 (unsigned long long) server->fsid.major,
1337 (unsigned long long) server->fsid.minor);
6aaca566
DH		 1338
1339 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %-7s %-17s\n",
1340 clp->cl_nfsversion,
1341 NIPQUAD(clp->cl_addr.sin_addr),
1342 ntohs(clp->cl_addr.sin_port),
1343 dev,
1344 fsid);
1345
1346 return 0;
1347}
1348
1349/*
1350 * initialise the /proc/fs/nfsfs/ directory
1351 */
1352int __init nfs_fs_proc_init(void)
1353{
1354 struct proc_dir_entry *p;
1355
1356 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
1357 if (!proc_fs_nfs)
1358 goto error_0;
1359
1360 proc_fs_nfs->owner = THIS_MODULE;
1361
1362 /* a file of servers with which we're dealing */
1363 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs);
1364 if (!p)
1365 goto error_1;
1366
1367 p->proc_fops = &nfs_server_list_fops;
1368 p->owner = THIS_MODULE;
1369
1370 /* a file of volumes that we have mounted */
1371 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
1372 if (!p)
1373 goto error_2;
1374
1375 p->proc_fops = &nfs_volume_list_fops;
1376 p->owner = THIS_MODULE;
1377 return 0;
1378
1379error_2:
1380 remove_proc_entry("servers", proc_fs_nfs);
1381error_1:
1382 remove_proc_entry("nfsfs", proc_root_fs);
1383error_0:
1384 return -ENOMEM;
1385}
1386
1387/*
1388 * clean up the /proc/fs/nfsfs/ directory
1389 */
1390void nfs_fs_proc_exit(void)
1391{
1392 remove_proc_entry("volumes", proc_fs_nfs);
1393 remove_proc_entry("servers", proc_fs_nfs);
1394 remove_proc_entry("nfsfs", proc_root_fs);
1395}
1396
1397#endif /* CONFIG_PROC_FS */
Linux kernel - Deliverables
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