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NFSv4: Return unreferenced delegations more promptly
[linux-2.6-block.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>
3b0d3f93
TM		 37#include <linux/in6.h>
38#include <net/ipv6.h>
24c8dbbb
DH		 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
51static DEFINE_SPINLOCK(nfs_client_lock);
52static LIST_HEAD(nfs_client_list);
54ceac45 53static LIST_HEAD(nfs_volume_list);
24c8dbbb
DH		 54static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
55
5006a76c
DH		 56/*
57 * RPC cruft for NFS
58 */
59static 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
69struct 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
78struct rpc_stat nfs_rpcstat = {
79 .program = &nfs_program
80};
81
82
83#ifdef CONFIG_NFS_V3_ACL
84static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
85static struct rpc_version * nfsacl_version[] = {
86 [3] = &nfsacl_version3,
87};
88
89struct 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
3a498026
TM		 98struct nfs_client_initdata {
99 const char *hostname;
d7422c47 100 const struct sockaddr *addr;
6e4cffd7 101 size_t addrlen;
40c55319 102 const struct nfs_rpc_ops *rpc_ops;
59dca3b2 103 int proto;
3a498026
TM		 104};
105
24c8dbbb
DH		 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 */
3a498026 112static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
24c8dbbb
DH		 113{
114 struct nfs_client *clp;
7c67db3a 115 struct rpc_cred *cred;
24c8dbbb
DH		 116
117 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
118 goto error_0;
119
40c55319
TM		 120 clp->rpc_ops = cl_init->rpc_ops;
121
122 if (cl_init->rpc_ops->version == 4) {
24c8dbbb
DH		 123 if (nfs_callback_up() < 0)
124 goto error_2;
125 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
126 }
127
128 atomic_set(&clp->cl_count, 1);
129 clp->cl_cons_state = NFS_CS_INITING;
130
6e4cffd7
CL		 131 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
132 clp->cl_addrlen = cl_init->addrlen;
24c8dbbb 133
3a498026
TM		 134 if (cl_init->hostname) {
135 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
24c8dbbb
DH		 136 if (!clp->cl_hostname)
137 goto error_3;
138 }
139
140 INIT_LIST_HEAD(&clp->cl_superblocks);
141 clp->cl_rpcclient = ERR_PTR(-EINVAL);
142
59dca3b2
TM		 143 clp->cl_proto = cl_init->proto;
144
24c8dbbb 145#ifdef CONFIG_NFS_V4
24c8dbbb 146 INIT_LIST_HEAD(&clp->cl_delegations);
24c8dbbb 147 spin_lock_init(&clp->cl_lock);
65f27f38 148 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
24c8dbbb
DH		 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
7c67db3a
TM		 153 cred = rpc_lookup_machine_cred();
154 if (!IS_ERR(cred))
155 clp->cl_machine_cred = cred;
24c8dbbb
DH		 156
157 return clp;
158
159error_3:
9c5bf38d
TM		 160 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
161 nfs_callback_down();
24c8dbbb 162error_2:
24c8dbbb
DH		 163 kfree(clp);
164error_0:
165 return NULL;
166}
167
5dd3177a
TM		 168static void nfs4_shutdown_client(struct nfs_client *clp)
169{
170#ifdef CONFIG_NFS_V4
171 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
172 nfs4_kill_renewd(clp);
9f958ab8 173 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
5dd3177a
TM		 174 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
175 nfs_idmap_delete(clp);
f6a1cc89
TM		 176
177 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
5dd3177a
TM		 178#endif
179}
180
24c8dbbb
DH		 181/*
182 * Destroy a shared client record
183 */
184static void nfs_free_client(struct nfs_client *clp)
185{
40c55319 186 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
24c8dbbb 187
5dd3177a 188 nfs4_shutdown_client(clp);
24c8dbbb
DH		 189
190 /* -EIO all pending I/O */
191 if (!IS_ERR(clp->cl_rpcclient))
192 rpc_shutdown_client(clp->cl_rpcclient);
193
194 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
195 nfs_callback_down();
196
7c67db3a
TM		 197 if (clp->cl_machine_cred != NULL)
198 put_rpccred(clp->cl_machine_cred);
199
24c8dbbb
DH		 200 kfree(clp->cl_hostname);
201 kfree(clp);
202
203 dprintk("<-- nfs_free_client()\n");
204}
205
206/*
207 * Release a reference to a shared client record
208 */
209void nfs_put_client(struct nfs_client *clp)
210{
27ba8512
DH		 211 if (!clp)
212 return;
213
24c8dbbb
DH		 214 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
215
216 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
217 list_del(&clp->cl_share_link);
218 spin_unlock(&nfs_client_lock);
219
220 BUG_ON(!list_empty(&clp->cl_superblocks));
221
222 nfs_free_client(clp);
223 }
224}
225
3b0d3f93
TM		 226static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
227 const struct sockaddr_in *sa2)
228{
229 return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
230}
231
232static int nfs_sockaddr_match_ipaddr6(const struct sockaddr_in6 *sa1,
233 const struct sockaddr_in6 *sa2)
234{
235 return ipv6_addr_equal(&sa1->sin6_addr, &sa2->sin6_addr);
236}
237
238static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
239 const struct sockaddr *sa2)
240{
241 switch (sa1->sa_family) {
242 case AF_INET:
243 return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
244 (const struct sockaddr_in *)sa2);
245 case AF_INET6:
246 return nfs_sockaddr_match_ipaddr6((const struct sockaddr_in6 *)sa1,
247 (const struct sockaddr_in6 *)sa2);
248 }
249 BUG();
250}
251
24c8dbbb 252/*
c81468a1
TM		 253 * Find a client by IP address and protocol version
254 * - returns NULL if no such client
24c8dbbb 255 */
ff052645 256struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
24c8dbbb
DH		 257{
258 struct nfs_client *clp;
259
c81468a1 260 spin_lock(&nfs_client_lock);
24c8dbbb 261 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
3b0d3f93
TM		 262 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
263
13bbc06a 264 /* Don't match clients that failed to initialise properly */
c81468a1 265 if (clp->cl_cons_state != NFS_CS_READY)
13bbc06a
TM		 266 continue;
267
24c8dbbb 268 /* Different NFS versions cannot share the same nfs_client */
40c55319 269 if (clp->rpc_ops->version != nfsversion)
24c8dbbb
DH		 270 continue;
271
3b0d3f93
TM		 272 if (addr->sa_family != clap->sa_family)
273 continue;
c81468a1 274 /* Match only the IP address, not the port number */
3b0d3f93 275 if (!nfs_sockaddr_match_ipaddr(addr, clap))
24c8dbbb
DH		 276 continue;
277
c81468a1
TM		 278 atomic_inc(&clp->cl_count);
279 spin_unlock(&nfs_client_lock);
280 return clp;
24c8dbbb 281 }
c81468a1 282 spin_unlock(&nfs_client_lock);
24c8dbbb 283 return NULL;
24c8dbbb
DH		 284}
285
3fbd67ad
TM		 286/*
287 * Find a client by IP address and protocol version
288 * - returns NULL if no such client
289 */
290struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
291{
292 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
293 u32 nfsvers = clp->rpc_ops->version;
294
295 spin_lock(&nfs_client_lock);
296 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
297 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
298
299 /* Don't match clients that failed to initialise properly */
300 if (clp->cl_cons_state != NFS_CS_READY)
301 continue;
302
303 /* Different NFS versions cannot share the same nfs_client */
304 if (clp->rpc_ops->version != nfsvers)
305 continue;
306
307 if (sap->sa_family != clap->sa_family)
308 continue;
309 /* Match only the IP address, not the port number */
310 if (!nfs_sockaddr_match_ipaddr(sap, clap))
311 continue;
312
313 atomic_inc(&clp->cl_count);
314 spin_unlock(&nfs_client_lock);
315 return clp;
316 }
317 spin_unlock(&nfs_client_lock);
318 return NULL;
319}
320
24c8dbbb 321/*
c81468a1
TM		 322 * Find an nfs_client on the list that matches the initialisation data
323 * that is supplied.
24c8dbbb 324 */
c81468a1 325static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
24c8dbbb
DH		 326{
327 struct nfs_client *clp;
328
c81468a1
TM		 329 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
330 /* Don't match clients that failed to initialise properly */
331 if (clp->cl_cons_state < 0)
332 continue;
333
334 /* Different NFS versions cannot share the same nfs_client */
40c55319 335 if (clp->rpc_ops != data->rpc_ops)
c81468a1
TM		 336 continue;
337
59dca3b2
TM		 338 if (clp->cl_proto != data->proto)
339 continue;
340
c81468a1
TM		 341 /* Match the full socket address */
342 if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0)
343 continue;
344
345 atomic_inc(&clp->cl_count);
346 return clp;
13bbc06a 347 }
c81468a1 348 return NULL;
24c8dbbb
DH		 349}
350
351/*
352 * Look up a client by IP address and protocol version
353 * - creates a new record if one doesn't yet exist
354 */
3a498026 355static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
24c8dbbb
DH		 356{
357 struct nfs_client *clp, *new = NULL;
358 int error;
359
d7422c47
CL		 360 dprintk("--> nfs_get_client(%s,v%u)\n",
361 cl_init->hostname ?: "", cl_init->rpc_ops->version);
24c8dbbb
DH		 362
363 /* see if the client already exists */
364 do {
365 spin_lock(&nfs_client_lock);
366
c81468a1 367 clp = nfs_match_client(cl_init);
24c8dbbb
DH		 368 if (clp)
369 goto found_client;
370 if (new)
371 goto install_client;
372
373 spin_unlock(&nfs_client_lock);
374
3a498026 375 new = nfs_alloc_client(cl_init);
24c8dbbb
DH		 376 } while (new);
377
378 return ERR_PTR(-ENOMEM);
379
380 /* install a new client and return with it unready */
381install_client:
382 clp = new;
383 list_add(&clp->cl_share_link, &nfs_client_list);
384 spin_unlock(&nfs_client_lock);
385 dprintk("--> nfs_get_client() = %p [new]\n", clp);
386 return clp;
387
388 /* found an existing client
389 * - make sure it's ready before returning
390 */
391found_client:
392 spin_unlock(&nfs_client_lock);
393
394 if (new)
395 nfs_free_client(new);
396
150030b7 397 error = wait_event_killable(nfs_client_active_wq,
0bae89ec
TM		 398 clp->cl_cons_state != NFS_CS_INITING);
399 if (error < 0) {
400 nfs_put_client(clp);
401 return ERR_PTR(-ERESTARTSYS);
24c8dbbb
DH		 402 }
403
404 if (clp->cl_cons_state < NFS_CS_READY) {
405 error = clp->cl_cons_state;
406 nfs_put_client(clp);
407 return ERR_PTR(error);
408 }
409
54ceac45
DH		 410 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
411
24c8dbbb
DH		 412 dprintk("--> nfs_get_client() = %p [share]\n", clp);
413 return clp;
414}
415
416/*
417 * Mark a server as ready or failed
418 */
54ceac45 419static void nfs_mark_client_ready(struct nfs_client *clp, int state)
24c8dbbb
DH		 420{
421 clp->cl_cons_state = state;
422 wake_up_all(&nfs_client_active_wq);
423}
5006a76c
DH		 424
425/*
426 * Initialise the timeout values for a connection
427 */
428static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
429 unsigned int timeo, unsigned int retrans)
430{
431 to->to_initval = timeo * HZ / 10;
432 to->to_retries = retrans;
5006a76c
DH		 433
434 switch (proto) {
0896a725 435 case XPRT_TRANSPORT_TCP:
2cf7ff7a 436 case XPRT_TRANSPORT_RDMA:
259875ef
TM		 437 if (to->to_retries == 0)
438 to->to_retries = NFS_DEF_TCP_RETRANS;
7a3e3e18 439 if (to->to_initval == 0)
259875ef 440 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
5006a76c
DH		 441 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
442 to->to_initval = NFS_MAX_TCP_TIMEOUT;
443 to->to_increment = to->to_initval;
444 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
7a3e3e18
TM		 445 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
446 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
447 if (to->to_maxval < to->to_initval)
448 to->to_maxval = to->to_initval;
5006a76c
DH		 449 to->to_exponential = 0;
450 break;
0896a725 451 case XPRT_TRANSPORT_UDP:
259875ef
TM		 452 if (to->to_retries == 0)
453 to->to_retries = NFS_DEF_UDP_RETRANS;
5006a76c 454 if (!to->to_initval)
259875ef 455 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
5006a76c
DH		 456 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
457 to->to_initval = NFS_MAX_UDP_TIMEOUT;
458 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
459 to->to_exponential = 1;
460 break;
259875ef
TM		 461 default:
462 BUG();
5006a76c
DH		 463 }
464}
465
466/*
467 * Create an RPC client handle
468 */
59dca3b2 469static int nfs_create_rpc_client(struct nfs_client *clp,
33170233
TM		 470 const struct rpc_timeout *timeparms,
471 rpc_authflavor_t flavor,
4a01b8a4 472 int discrtry, int noresvport)
5006a76c 473{
5006a76c 474 struct rpc_clnt *clnt = NULL;
41877d20 475 struct rpc_create_args args = {
59dca3b2 476 .protocol = clp->cl_proto,
41877d20 477 .address = (struct sockaddr *)&clp->cl_addr,
6e4cffd7 478 .addrsize = clp->cl_addrlen,
33170233 479 .timeout = timeparms,
41877d20
CL		 480 .servername = clp->cl_hostname,
481 .program = &nfs_program,
482 .version = clp->rpc_ops->version,
483 .authflavor = flavor,
484 };
5006a76c 485
4a01b8a4
CL		 486 if (discrtry)
487 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
488 if (noresvport)
489 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
490
5006a76c
DH		 491 if (!IS_ERR(clp->cl_rpcclient))
492 return 0;
493
41877d20 494 clnt = rpc_create(&args);
5006a76c
DH		 495 if (IS_ERR(clnt)) {
496 dprintk("%s: cannot create RPC client. Error = %ld\n",
3110ff80 497 __func__, PTR_ERR(clnt));
5006a76c
DH		 498 return PTR_ERR(clnt);
499 }
500
5006a76c
DH		 501 clp->cl_rpcclient = clnt;
502 return 0;
503}
54ceac45
DH		 504
505/*
506 * Version 2 or 3 client destruction
507 */
508static void nfs_destroy_server(struct nfs_server *server)
509{
54ceac45 510 if (!(server->flags & NFS_MOUNT_NONLM))
9289e7f9 511 nlmclnt_done(server->nlm_host);
54ceac45
DH		 512}
513
514/*
515 * Version 2 or 3 lockd setup
516 */
517static int nfs_start_lockd(struct nfs_server *server)
518{
9289e7f9
CL		 519 struct nlm_host *host;
520 struct nfs_client *clp = server->nfs_client;
883bb163
CL		 521 struct nlmclnt_initdata nlm_init = {
522 .hostname = clp->cl_hostname,
523 .address = (struct sockaddr *)&clp->cl_addr,
524 .addrlen = clp->cl_addrlen,
525 .protocol = server->flags & NFS_MOUNT_TCP ?
526 IPPROTO_TCP : IPPROTO_UDP,
527 .nfs_version = clp->rpc_ops->version,
0cb2659b
CL		 528 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
529 1 : 0,
883bb163 530 };
54ceac45 531
883bb163 532 if (nlm_init.nfs_version > 3)
9289e7f9 533 return 0;
54ceac45 534 if (server->flags & NFS_MOUNT_NONLM)
9289e7f9
CL		 535 return 0;
536
883bb163 537 host = nlmclnt_init(&nlm_init);
9289e7f9
CL		 538 if (IS_ERR(host))
539 return PTR_ERR(host);
540
541 server->nlm_host = host;
542 server->destroy = nfs_destroy_server;
543 return 0;
54ceac45
DH		 544}
545
546/*
547 * Initialise an NFSv3 ACL client connection
548 */
549#ifdef CONFIG_NFS_V3_ACL
550static void nfs_init_server_aclclient(struct nfs_server *server)
551{
40c55319 552 if (server->nfs_client->rpc_ops->version != 3)
54ceac45
DH		 553 goto out_noacl;
554 if (server->flags & NFS_MOUNT_NOACL)
555 goto out_noacl;
556
557 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
558 if (IS_ERR(server->client_acl))
559 goto out_noacl;
560
561 /* No errors! Assume that Sun nfsacls are supported */
562 server->caps |= NFS_CAP_ACLS;
563 return;
564
565out_noacl:
566 server->caps &= ~NFS_CAP_ACLS;
567}
568#else
569static inline void nfs_init_server_aclclient(struct nfs_server *server)
570{
571 server->flags &= ~NFS_MOUNT_NOACL;
572 server->caps &= ~NFS_CAP_ACLS;
573}
574#endif
575
576/*
577 * Create a general RPC client
578 */
33170233
TM		 579static int nfs_init_server_rpcclient(struct nfs_server *server,
580 const struct rpc_timeout *timeo,
581 rpc_authflavor_t pseudoflavour)
54ceac45
DH		 582{
583 struct nfs_client *clp = server->nfs_client;
584
585 server->client = rpc_clone_client(clp->cl_rpcclient);
586 if (IS_ERR(server->client)) {
3110ff80 587 dprintk("%s: couldn't create rpc_client!\n", __func__);
54ceac45
DH		 588 return PTR_ERR(server->client);
589 }
590
33170233
TM		 591 memcpy(&server->client->cl_timeout_default,
592 timeo,
593 sizeof(server->client->cl_timeout_default));
594 server->client->cl_timeout = &server->client->cl_timeout_default;
595
54ceac45
DH		 596 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
597 struct rpc_auth *auth;
598
599 auth = rpcauth_create(pseudoflavour, server->client);
600 if (IS_ERR(auth)) {
3110ff80 601 dprintk("%s: couldn't create credcache!\n", __func__);
54ceac45
DH		 602 return PTR_ERR(auth);
603 }
604 }
605 server->client->cl_softrtry = 0;
606 if (server->flags & NFS_MOUNT_SOFT)
607 server->client->cl_softrtry = 1;
608
54ceac45
DH		 609 return 0;
610}
611
612/*
613 * Initialise an NFS2 or NFS3 client
614 */
2283f8d6 615static int nfs_init_client(struct nfs_client *clp,
33170233 616 const struct rpc_timeout *timeparms,
2283f8d6 617 const struct nfs_parsed_mount_data *data)
54ceac45 618{
54ceac45
DH		 619 int error;
620
621 if (clp->cl_cons_state == NFS_CS_READY) {
622 /* the client is already initialised */
623 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
624 return 0;
625 }
626
54ceac45
DH		 627 /*
628 * Create a client RPC handle for doing FSSTAT with UNIX auth only
629 * - RFC 2623, sec 2.3.2
630 */
d740351b
CL		 631 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
632 0, data->flags & NFS_MOUNT_NORESVPORT);
54ceac45
DH		 633 if (error < 0)
634 goto error;
635 nfs_mark_client_ready(clp, NFS_CS_READY);
636 return 0;
637
638error:
639 nfs_mark_client_ready(clp, error);
640 dprintk("<-- nfs_init_client() = xerror %d\n", error);
641 return error;
642}
643
644/*
645 * Create a version 2 or 3 client
646 */
2283f8d6
TT		 647static int nfs_init_server(struct nfs_server *server,
648 const struct nfs_parsed_mount_data *data)
54ceac45 649{
3a498026
TM		 650 struct nfs_client_initdata cl_init = {
651 .hostname = data->nfs_server.hostname,
d7422c47 652 .addr = (const struct sockaddr *)&data->nfs_server.address,
4c568017 653 .addrlen = data->nfs_server.addrlen,
40c55319 654 .rpc_ops = &nfs_v2_clientops,
59dca3b2 655 .proto = data->nfs_server.protocol,
3a498026 656 };
33170233 657 struct rpc_timeout timeparms;
54ceac45 658 struct nfs_client *clp;
3a498026 659 int error;
54ceac45
DH		 660
661 dprintk("--> nfs_init_server()\n");
662
663#ifdef CONFIG_NFS_V3
664 if (data->flags & NFS_MOUNT_VER3)
40c55319 665 cl_init.rpc_ops = &nfs_v3_clientops;
54ceac45
DH		 666#endif
667
668 /* Allocate or find a client reference we can use */
3a498026 669 clp = nfs_get_client(&cl_init);
54ceac45
DH		 670 if (IS_ERR(clp)) {
671 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
672 return PTR_ERR(clp);
673 }
674
33170233
TM		 675 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
676 data->timeo, data->retrans);
677 error = nfs_init_client(clp, &timeparms, data);
54ceac45
DH		 678 if (error < 0)
679 goto error;
680
681 server->nfs_client = clp;
682
683 /* Initialise the client representation from the mount data */
ff3525a5 684 server->flags = data->flags;
54ceac45
DH		 685
686 if (data->rsize)
687 server->rsize = nfs_block_size(data->rsize, NULL);
688 if (data->wsize)
689 server->wsize = nfs_block_size(data->wsize, NULL);
690
691 server->acregmin = data->acregmin * HZ;
692 server->acregmax = data->acregmax * HZ;
693 server->acdirmin = data->acdirmin * HZ;
694 server->acdirmax = data->acdirmax * HZ;
695
696 /* Start lockd here, before we might error out */
697 error = nfs_start_lockd(server);
698 if (error < 0)
699 goto error;
700
f22d6d79
CL		 701 server->port = data->nfs_server.port;
702
33170233 703 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
54ceac45
DH		 704 if (error < 0)
705 goto error;
706
3f8400d1
CL		 707 /* Preserve the values of mount_server-related mount options */
708 if (data->mount_server.addrlen) {
709 memcpy(&server->mountd_address, &data->mount_server.address,
710 data->mount_server.addrlen);
711 server->mountd_addrlen = data->mount_server.addrlen;
712 }
713 server->mountd_version = data->mount_server.version;
714 server->mountd_port = data->mount_server.port;
715 server->mountd_protocol = data->mount_server.protocol;
716
54ceac45
DH		 717 server->namelen = data->namlen;
718 /* Create a client RPC handle for the NFSv3 ACL management interface */
719 nfs_init_server_aclclient(server);
54ceac45
DH		 720 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
721 return 0;
722
723error:
724 server->nfs_client = NULL;
725 nfs_put_client(clp);
726 dprintk("<-- nfs_init_server() = xerror %d\n", error);
727 return error;
728}
729
730/*
731 * Load up the server record from information gained in an fsinfo record
732 */
733static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
734{
735 unsigned long max_rpc_payload;
736
737 /* Work out a lot of parameters */
738 if (server->rsize == 0)
739 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
740 if (server->wsize == 0)
741 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
742
743 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
744 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
745 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
746 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
747
748 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
749 if (server->rsize > max_rpc_payload)
750 server->rsize = max_rpc_payload;
751 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
752 server->rsize = NFS_MAX_FILE_IO_SIZE;
753 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
e0bf68dd 754
54ceac45
DH		 755 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
756
757 if (server->wsize > max_rpc_payload)
758 server->wsize = max_rpc_payload;
759 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
760 server->wsize = NFS_MAX_FILE_IO_SIZE;
761 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
762 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
763
764 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
765 if (server->dtsize > PAGE_CACHE_SIZE)
766 server->dtsize = PAGE_CACHE_SIZE;
767 if (server->dtsize > server->rsize)
768 server->dtsize = server->rsize;
769
770 if (server->flags & NFS_MOUNT_NOAC) {
771 server->acregmin = server->acregmax = 0;
772 server->acdirmin = server->acdirmax = 0;
773 }
774
775 server->maxfilesize = fsinfo->maxfilesize;
776
777 /* We're airborne Set socket buffersize */
778 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
779}
780
781/*
782 * Probe filesystem information, including the FSID on v2/v3
783 */
784static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
785{
786 struct nfs_fsinfo fsinfo;
787 struct nfs_client *clp = server->nfs_client;
788 int error;
789
790 dprintk("--> nfs_probe_fsinfo()\n");
791
792 if (clp->rpc_ops->set_capabilities != NULL) {
793 error = clp->rpc_ops->set_capabilities(server, mntfh);
794 if (error < 0)
795 goto out_error;
796 }
797
798 fsinfo.fattr = fattr;
799 nfs_fattr_init(fattr);
800 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
801 if (error < 0)
802 goto out_error;
803
804 nfs_server_set_fsinfo(server, &fsinfo);
e0bf68dd
PZ		 805 error = bdi_init(&server->backing_dev_info);
806 if (error)
807 goto out_error;
808
54ceac45
DH		 809
810 /* Get some general file system info */
811 if (server->namelen == 0) {
812 struct nfs_pathconf pathinfo;
813
814 pathinfo.fattr = fattr;
815 nfs_fattr_init(fattr);
816
817 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
818 server->namelen = pathinfo.max_namelen;
819 }
820
821 dprintk("<-- nfs_probe_fsinfo() = 0\n");
822 return 0;
823
824out_error:
825 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
826 return error;
827}
828
829/*
830 * Copy useful information when duplicating a server record
831 */
832static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
833{
834 target->flags = source->flags;
835 target->acregmin = source->acregmin;
836 target->acregmax = source->acregmax;
837 target->acdirmin = source->acdirmin;
838 target->acdirmax = source->acdirmax;
839 target->caps = source->caps;
840}
841
842/*
843 * Allocate and initialise a server record
844 */
845static struct nfs_server *nfs_alloc_server(void)
846{
847 struct nfs_server *server;
848
849 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
850 if (!server)
851 return NULL;
852
853 server->client = server->client_acl = ERR_PTR(-EINVAL);
854
855 /* Zero out the NFS state stuff */
856 INIT_LIST_HEAD(&server->client_link);
857 INIT_LIST_HEAD(&server->master_link);
858
ef818a28
SD		 859 atomic_set(&server->active, 0);
860
54ceac45
DH		 861 server->io_stats = nfs_alloc_iostats();
862 if (!server->io_stats) {
863 kfree(server);
864 return NULL;
865 }
866
867 return server;
868}
869
870/*
871 * Free up a server record
872 */
873void nfs_free_server(struct nfs_server *server)
874{
875 dprintk("--> nfs_free_server()\n");
876
877 spin_lock(&nfs_client_lock);
878 list_del(&server->client_link);
879 list_del(&server->master_link);
880 spin_unlock(&nfs_client_lock);
881
882 if (server->destroy != NULL)
883 server->destroy(server);
5cef338b
TM		 884
885 if (!IS_ERR(server->client_acl))
886 rpc_shutdown_client(server->client_acl);
54ceac45
DH		 887 if (!IS_ERR(server->client))
888 rpc_shutdown_client(server->client);
889
890 nfs_put_client(server->nfs_client);
891
892 nfs_free_iostats(server->io_stats);
e0bf68dd 893 bdi_destroy(&server->backing_dev_info);
54ceac45
DH		 894 kfree(server);
895 nfs_release_automount_timer();
896 dprintk("<-- nfs_free_server()\n");
897}
898
899/*
900 * Create a version 2 or 3 volume record
901 * - keyed on server and FSID
902 */
2283f8d6 903struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
54ceac45
DH		 904 struct nfs_fh *mntfh)
905{
906 struct nfs_server *server;
907 struct nfs_fattr fattr;
908 int error;
909
910 server = nfs_alloc_server();
911 if (!server)
912 return ERR_PTR(-ENOMEM);
913
914 /* Get a client representation */
915 error = nfs_init_server(server, data);
916 if (error < 0)
917 goto error;
918
919 BUG_ON(!server->nfs_client);
920 BUG_ON(!server->nfs_client->rpc_ops);
921 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
922
923 /* Probe the root fh to retrieve its FSID */
924 error = nfs_probe_fsinfo(server, mntfh, &fattr);
925 if (error < 0)
926 goto error;
54af3bb5
TM		 927 if (server->nfs_client->rpc_ops->version == 3) {
928 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
929 server->namelen = NFS3_MAXNAMLEN;
930 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
931 server->caps |= NFS_CAP_READDIRPLUS;
932 } else {
933 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
934 server->namelen = NFS2_MAXNAMLEN;
935 }
936
54ceac45
DH		 937 if (!(fattr.valid & NFS_ATTR_FATTR)) {
938 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
939 if (error < 0) {
940 dprintk("nfs_create_server: getattr error = %d\n", -error);
941 goto error;
942 }
943 }
944 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
945
6daabf1b
DH		 946 dprintk("Server FSID: %llx:%llx\n",
947 (unsigned long long) server->fsid.major,
948 (unsigned long long) server->fsid.minor);
54ceac45
DH		 949
950 BUG_ON(!server->nfs_client);
951 BUG_ON(!server->nfs_client->rpc_ops);
952 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
953
954 spin_lock(&nfs_client_lock);
955 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
956 list_add_tail(&server->master_link, &nfs_volume_list);
957 spin_unlock(&nfs_client_lock);
958
959 server->mount_time = jiffies;
960 return server;
961
962error:
963 nfs_free_server(server);
964 return ERR_PTR(error);
965}
966
967#ifdef CONFIG_NFS_V4
968/*
969 * Initialise an NFS4 client record
970 */
971static int nfs4_init_client(struct nfs_client *clp,
33170233 972 const struct rpc_timeout *timeparms,
7d9ac06f 973 const char *ip_addr,
d740351b
CL		 974 rpc_authflavor_t authflavour,
975 int flags)
54ceac45
DH		 976{
977 int error;
978
979 if (clp->cl_cons_state == NFS_CS_READY) {
980 /* the client is initialised already */
981 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
982 return 0;
983 }
984
985 /* Check NFS protocol revision and initialize RPC op vector */
986 clp->rpc_ops = &nfs_v4_clientops;
987
59dca3b2 988 error = nfs_create_rpc_client(clp, timeparms, authflavour,
d740351b 989 1, flags & NFS_MOUNT_NORESVPORT);
54ceac45
DH		 990 if (error < 0)
991 goto error;
7d9ac06f 992 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
54ceac45
DH		 993
994 error = nfs_idmap_new(clp);
995 if (error < 0) {
996 dprintk("%s: failed to create idmapper. Error = %d\n",
3110ff80 997 __func__, error);
54ceac45
DH		 998 goto error;
999 }
9c5bf38d 1000 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
54ceac45
DH		 1001
1002 nfs_mark_client_ready(clp, NFS_CS_READY);
1003 return 0;
1004
1005error:
1006 nfs_mark_client_ready(clp, error);
1007 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1008 return error;
1009}
1010
1011/*
1012 * Set up an NFS4 client
1013 */
1014static int nfs4_set_client(struct nfs_server *server,
dcecae0f
CL		 1015 const char *hostname,
1016 const struct sockaddr *addr,
1017 const size_t addrlen,
7d9ac06f 1018 const char *ip_addr,
54ceac45 1019 rpc_authflavor_t authflavour,
33170233 1020 int proto, const struct rpc_timeout *timeparms)
54ceac45 1021{
3a498026
TM		 1022 struct nfs_client_initdata cl_init = {
1023 .hostname = hostname,
dcecae0f
CL		 1024 .addr = addr,
1025 .addrlen = addrlen,
40c55319 1026 .rpc_ops = &nfs_v4_clientops,
59dca3b2 1027 .proto = proto,
3a498026 1028 };
54ceac45
DH		 1029 struct nfs_client *clp;
1030 int error;
1031
1032 dprintk("--> nfs4_set_client()\n");
1033
1034 /* Allocate or find a client reference we can use */
3a498026 1035 clp = nfs_get_client(&cl_init);
54ceac45
DH		 1036 if (IS_ERR(clp)) {
1037 error = PTR_ERR(clp);
1038 goto error;
1039 }
d740351b
CL		 1040 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1041 server->flags);
54ceac45
DH		 1042 if (error < 0)
1043 goto error_put;
1044
1045 server->nfs_client = clp;
1046 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1047 return 0;
1048
1049error_put:
1050 nfs_put_client(clp);
1051error:
1052 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1053 return error;
1054}
1055
1056/*
1057 * Create a version 4 volume record
1058 */
1059static int nfs4_init_server(struct nfs_server *server,
91ea40b9 1060 const struct nfs_parsed_mount_data *data)
54ceac45 1061{
33170233 1062 struct rpc_timeout timeparms;
54ceac45
DH		 1063 int error;
1064
1065 dprintk("--> nfs4_init_server()\n");
1066
33170233
TM		 1067 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1068 data->timeo, data->retrans);
1069
542fcc33
CL		 1070 /* Initialise the client representation from the mount data */
1071 server->flags = data->flags;
1072 server->caps |= NFS_CAP_ATOMIC_OPEN;
1073
33170233
TM		 1074 /* Get a client record */
1075 error = nfs4_set_client(server,
1076 data->nfs_server.hostname,
1077 (const struct sockaddr *)&data->nfs_server.address,
1078 data->nfs_server.addrlen,
1079 data->client_address,
1080 data->auth_flavors[0],
1081 data->nfs_server.protocol,
1082 &timeparms);
1083 if (error < 0)
1084 goto error;
1085
54ceac45
DH		 1086 if (data->rsize)
1087 server->rsize = nfs_block_size(data->rsize, NULL);
1088 if (data->wsize)
1089 server->wsize = nfs_block_size(data->wsize, NULL);
1090
1091 server->acregmin = data->acregmin * HZ;
1092 server->acregmax = data->acregmax * HZ;
1093 server->acdirmin = data->acdirmin * HZ;
1094 server->acdirmax = data->acdirmax * HZ;
1095
f22d6d79
CL		 1096 server->port = data->nfs_server.port;
1097
33170233 1098 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
54ceac45 1099
33170233 1100error:
54ceac45
DH		 1101 /* Done */
1102 dprintk("<-- nfs4_init_server() = %d\n", error);
1103 return error;
1104}
1105
1106/*
1107 * Create a version 4 volume record
1108 * - keyed on server and FSID
1109 */
91ea40b9 1110struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
54ceac45
DH		 1111 struct nfs_fh *mntfh)
1112{
1113 struct nfs_fattr fattr;
1114 struct nfs_server *server;
1115 int error;
1116
1117 dprintk("--> nfs4_create_server()\n");
1118
1119 server = nfs_alloc_server();
1120 if (!server)
1121 return ERR_PTR(-ENOMEM);
1122
54ceac45 1123 /* set up the general RPC client */
91ea40b9 1124 error = nfs4_init_server(server, data);
54ceac45
DH		 1125 if (error < 0)
1126 goto error;
1127
1128 BUG_ON(!server->nfs_client);
1129 BUG_ON(!server->nfs_client->rpc_ops);
1130 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1131
1132 /* Probe the root fh to retrieve its FSID */
91ea40b9 1133 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
54ceac45
DH		 1134 if (error < 0)
1135 goto error;
1136
6daabf1b
DH		 1137 dprintk("Server FSID: %llx:%llx\n",
1138 (unsigned long long) server->fsid.major,
1139 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1140 dprintk("Mount FH: %d\n", mntfh->size);
1141
1142 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1143 if (error < 0)
1144 goto error;
1145
54af3bb5
TM		 1146 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1147 server->namelen = NFS4_MAXNAMLEN;
1148
54ceac45
DH		 1149 BUG_ON(!server->nfs_client);
1150 BUG_ON(!server->nfs_client->rpc_ops);
1151 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1152
1153 spin_lock(&nfs_client_lock);
1154 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1155 list_add_tail(&server->master_link, &nfs_volume_list);
1156 spin_unlock(&nfs_client_lock);
1157
1158 server->mount_time = jiffies;
1159 dprintk("<-- nfs4_create_server() = %p\n", server);
1160 return server;
1161
1162error:
1163 nfs_free_server(server);
1164 dprintk("<-- nfs4_create_server() = error %d\n", error);
1165 return ERR_PTR(error);
1166}
1167
1168/*
1169 * Create an NFS4 referral server record
1170 */
1171struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
f2d0d85e 1172 struct nfs_fh *mntfh)
54ceac45
DH		 1173{
1174 struct nfs_client *parent_client;
1175 struct nfs_server *server, *parent_server;
1176 struct nfs_fattr fattr;
1177 int error;
1178
1179 dprintk("--> nfs4_create_referral_server()\n");
1180
1181 server = nfs_alloc_server();
1182 if (!server)
1183 return ERR_PTR(-ENOMEM);
1184
1185 parent_server = NFS_SB(data->sb);
1186 parent_client = parent_server->nfs_client;
1187
542fcc33
CL		 1188 /* Initialise the client representation from the parent server */
1189 nfs_server_copy_userdata(server, parent_server);
1190 server->caps |= NFS_CAP_ATOMIC_OPEN;
1191
54ceac45
DH		 1192 /* Get a client representation.
1193 * Note: NFSv4 always uses TCP, */
dcecae0f 1194 error = nfs4_set_client(server, data->hostname,
6677d095
CL		 1195 data->addr,
1196 data->addrlen,
dcecae0f
CL		 1197 parent_client->cl_ipaddr,
1198 data->authflavor,
1199 parent_server->client->cl_xprt->prot,
33170233 1200 parent_server->client->cl_timeout);
297de4f6 1201 if (error < 0)
1202 goto error;
54ceac45 1203
33170233 1204 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
54ceac45
DH		 1205 if (error < 0)
1206 goto error;
1207
1208 BUG_ON(!server->nfs_client);
1209 BUG_ON(!server->nfs_client->rpc_ops);
1210 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1211
f2d0d85e
TM		 1212 /* Probe the root fh to retrieve its FSID and filehandle */
1213 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1214 if (error < 0)
1215 goto error;
1216
54ceac45 1217 /* probe the filesystem info for this server filesystem */
f2d0d85e 1218 error = nfs_probe_fsinfo(server, mntfh, &fattr);
54ceac45
DH		 1219 if (error < 0)
1220 goto error;
1221
54af3bb5
TM		 1222 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1223 server->namelen = NFS4_MAXNAMLEN;
1224
54ceac45 1225 dprintk("Referral FSID: %llx:%llx\n",
6daabf1b
DH		 1226 (unsigned long long) server->fsid.major,
1227 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1228
1229 spin_lock(&nfs_client_lock);
1230 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1231 list_add_tail(&server->master_link, &nfs_volume_list);
1232 spin_unlock(&nfs_client_lock);
1233
1234 server->mount_time = jiffies;
1235
1236 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1237 return server;
1238
1239error:
1240 nfs_free_server(server);
1241 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1242 return ERR_PTR(error);
1243}
1244
1245#endif /* CONFIG_NFS_V4 */
1246
1247/*
1248 * Clone an NFS2, NFS3 or NFS4 server record
1249 */
1250struct nfs_server *nfs_clone_server(struct nfs_server *source,
1251 struct nfs_fh *fh,
1252 struct nfs_fattr *fattr)
1253{
1254 struct nfs_server *server;
1255 struct nfs_fattr fattr_fsinfo;
1256 int error;
1257
1258 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
6daabf1b
DH		 1259 (unsigned long long) fattr->fsid.major,
1260 (unsigned long long) fattr->fsid.minor);
54ceac45
DH		 1261
1262 server = nfs_alloc_server();
1263 if (!server)
1264 return ERR_PTR(-ENOMEM);
1265
1266 /* Copy data from the source */
1267 server->nfs_client = source->nfs_client;
1268 atomic_inc(&server->nfs_client->cl_count);
1269 nfs_server_copy_userdata(server, source);
1270
1271 server->fsid = fattr->fsid;
1272
33170233
TM		 1273 error = nfs_init_server_rpcclient(server,
1274 source->client->cl_timeout,
1275 source->client->cl_auth->au_flavor);
54ceac45
DH		 1276 if (error < 0)
1277 goto out_free_server;
1278 if (!IS_ERR(source->client_acl))
1279 nfs_init_server_aclclient(server);
1280
1281 /* probe the filesystem info for this server filesystem */
1282 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1283 if (error < 0)
1284 goto out_free_server;
1285
54af3bb5
TM		 1286 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1287 server->namelen = NFS4_MAXNAMLEN;
1288
54ceac45 1289 dprintk("Cloned FSID: %llx:%llx\n",
6daabf1b
DH		 1290 (unsigned long long) server->fsid.major,
1291 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1292
1293 error = nfs_start_lockd(server);
1294 if (error < 0)
1295 goto out_free_server;
1296
1297 spin_lock(&nfs_client_lock);
1298 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1299 list_add_tail(&server->master_link, &nfs_volume_list);
1300 spin_unlock(&nfs_client_lock);
1301
1302 server->mount_time = jiffies;
1303
1304 dprintk("<-- nfs_clone_server() = %p\n", server);
1305 return server;
1306
1307out_free_server:
1308 nfs_free_server(server);
1309 dprintk("<-- nfs_clone_server() = error %d\n", error);
1310 return ERR_PTR(error);
1311}
6aaca566
DH		 1312
1313#ifdef CONFIG_PROC_FS
1314static struct proc_dir_entry *proc_fs_nfs;
1315
1316static int nfs_server_list_open(struct inode *inode, struct file *file);
1317static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1318static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1319static void nfs_server_list_stop(struct seq_file *p, void *v);
1320static int nfs_server_list_show(struct seq_file *m, void *v);
1321
1322static struct seq_operations nfs_server_list_ops = {
1323 .start = nfs_server_list_start,
1324 .next = nfs_server_list_next,
1325 .stop = nfs_server_list_stop,
1326 .show = nfs_server_list_show,
1327};
1328
00977a59 1329static const struct file_operations nfs_server_list_fops = {
6aaca566
DH		 1330 .open = nfs_server_list_open,
1331 .read = seq_read,
1332 .llseek = seq_lseek,
1333 .release = seq_release,
34b37235 1334 .owner = THIS_MODULE,
6aaca566
DH		 1335};
1336
1337static int nfs_volume_list_open(struct inode *inode, struct file *file);
1338static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1339static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1340static void nfs_volume_list_stop(struct seq_file *p, void *v);
1341static int nfs_volume_list_show(struct seq_file *m, void *v);
1342
1343static struct seq_operations nfs_volume_list_ops = {
1344 .start = nfs_volume_list_start,
1345 .next = nfs_volume_list_next,
1346 .stop = nfs_volume_list_stop,
1347 .show = nfs_volume_list_show,
1348};
1349
00977a59 1350static const struct file_operations nfs_volume_list_fops = {
6aaca566
DH		 1351 .open = nfs_volume_list_open,
1352 .read = seq_read,
1353 .llseek = seq_lseek,
1354 .release = seq_release,
34b37235 1355 .owner = THIS_MODULE,
6aaca566
DH		 1356};
1357
1358/*
1359 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1360 * we're dealing
1361 */
1362static int nfs_server_list_open(struct inode *inode, struct file *file)
1363{
1364 struct seq_file *m;
1365 int ret;
1366
1367 ret = seq_open(file, &nfs_server_list_ops);
1368 if (ret < 0)
1369 return ret;
1370
1371 m = file->private_data;
1372 m->private = PDE(inode)->data;
1373
1374 return 0;
1375}
1376
1377/*
1378 * set up the iterator to start reading from the server list and return the first item
1379 */
1380static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1381{
6aaca566
DH		 1382 /* lock the list against modification */
1383 spin_lock(&nfs_client_lock);
259902ea 1384 return seq_list_start_head(&nfs_client_list, *_pos);
6aaca566
DH		 1385}
1386
1387/*
1388 * move to next server
1389 */
1390static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1391{
259902ea 1392 return seq_list_next(v, &nfs_client_list, pos);
6aaca566
DH		 1393}
1394
1395/*
1396 * clean up after reading from the transports list
1397 */
1398static void nfs_server_list_stop(struct seq_file *p, void *v)
1399{
1400 spin_unlock(&nfs_client_lock);
1401}
1402
1403/*
1404 * display a header line followed by a load of call lines
1405 */
1406static int nfs_server_list_show(struct seq_file *m, void *v)
1407{
1408 struct nfs_client *clp;
1409
1410 /* display header on line 1 */
259902ea 1411 if (v == &nfs_client_list) {
6aaca566
DH		 1412 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1413 return 0;
1414 }
1415
1416 /* display one transport per line on subsequent lines */
1417 clp = list_entry(v, struct nfs_client, cl_share_link);
1418
5d8515ca 1419 seq_printf(m, "v%u %s %s %3d %s\n",
40c55319 1420 clp->rpc_ops->version,
5d8515ca
CL		 1421 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1422 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
6aaca566
DH		 1423 atomic_read(&clp->cl_count),
1424 clp->cl_hostname);
1425
1426 return 0;
1427}
1428
1429/*
1430 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1431 */
1432static int nfs_volume_list_open(struct inode *inode, struct file *file)
1433{
1434 struct seq_file *m;
1435 int ret;
1436
1437 ret = seq_open(file, &nfs_volume_list_ops);
1438 if (ret < 0)
1439 return ret;
1440
1441 m = file->private_data;
1442 m->private = PDE(inode)->data;
1443
1444 return 0;
1445}
1446
1447/*
1448 * set up the iterator to start reading from the volume list and return the first item
1449 */
1450static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1451{
6aaca566
DH		 1452 /* lock the list against modification */
1453 spin_lock(&nfs_client_lock);
259902ea 1454 return seq_list_start_head(&nfs_volume_list, *_pos);
6aaca566
DH		 1455}
1456
1457/*
1458 * move to next volume
1459 */
1460static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1461{
259902ea 1462 return seq_list_next(v, &nfs_volume_list, pos);
6aaca566
DH		 1463}
1464
1465/*
1466 * clean up after reading from the transports list
1467 */
1468static void nfs_volume_list_stop(struct seq_file *p, void *v)
1469{
1470 spin_unlock(&nfs_client_lock);
1471}
1472
1473/*
1474 * display a header line followed by a load of call lines
1475 */
1476static int nfs_volume_list_show(struct seq_file *m, void *v)
1477{
1478 struct nfs_server *server;
1479 struct nfs_client *clp;
1480 char dev[8], fsid[17];
1481
1482 /* display header on line 1 */
259902ea 1483 if (v == &nfs_volume_list) {
6aaca566
DH		 1484 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1485 return 0;
1486 }
1487 /* display one transport per line on subsequent lines */
1488 server = list_entry(v, struct nfs_server, master_link);
1489 clp = server->nfs_client;
1490
1491 snprintf(dev, 8, "%u:%u",
1492 MAJOR(server->s_dev), MINOR(server->s_dev));
1493
1494 snprintf(fsid, 17, "%llx:%llx",
6daabf1b
DH		 1495 (unsigned long long) server->fsid.major,
1496 (unsigned long long) server->fsid.minor);
6aaca566 1497
5d8515ca 1498 seq_printf(m, "v%u %s %s %-7s %-17s\n",
40c55319 1499 clp->rpc_ops->version,
5d8515ca
CL		 1500 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1501 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
6aaca566
DH		 1502 dev,
1503 fsid);
1504
1505 return 0;
1506}
1507
1508/*
1509 * initialise the /proc/fs/nfsfs/ directory
1510 */
1511int __init nfs_fs_proc_init(void)
1512{
1513 struct proc_dir_entry *p;
1514
36a5aeb8 1515 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
6aaca566
DH		 1516 if (!proc_fs_nfs)
1517 goto error_0;
1518
1519 proc_fs_nfs->owner = THIS_MODULE;
1520
1521 /* a file of servers with which we're dealing */
34b37235
DL		 1522 p = proc_create("servers", S_IFREG|S_IRUGO,
1523 proc_fs_nfs, &nfs_server_list_fops);
6aaca566
DH		 1524 if (!p)
1525 goto error_1;
1526
6aaca566 1527 /* a file of volumes that we have mounted */
34b37235
DL		 1528 p = proc_create("volumes", S_IFREG|S_IRUGO,
1529 proc_fs_nfs, &nfs_volume_list_fops);
6aaca566
DH		 1530 if (!p)
1531 goto error_2;
6aaca566
DH		 1532 return 0;
1533
1534error_2:
1535 remove_proc_entry("servers", proc_fs_nfs);
1536error_1:
36a5aeb8 1537 remove_proc_entry("fs/nfsfs", NULL);
6aaca566
DH		 1538error_0:
1539 return -ENOMEM;
1540}
1541
1542/*
1543 * clean up the /proc/fs/nfsfs/ directory
1544 */
1545void nfs_fs_proc_exit(void)
1546{
1547 remove_proc_entry("volumes", proc_fs_nfs);
1548 remove_proc_entry("servers", proc_fs_nfs);
36a5aeb8 1549 remove_proc_entry("fs/nfsfs", NULL);
6aaca566
DH		 1550}
1551
1552#endif /* CONFIG_PROC_FS */
Linux 6.x block layer and io_uring tree(s)