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NFS: Reduce the stack footprint of nfs_follow_mountpoint()
[GitHub/mt8127/android_kernel_alcatel_ttab.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 37#include <linux/in6.h>
5a0e3ad6 38#include <linux/slab.h>
3b0d3f93 39#include <net/ipv6.h>
24c8dbbb 40#include <linux/nfs_xdr.h>
0b5b7ae0 41#include <linux/sunrpc/bc_xprt.h>
24c8dbbb
DH		 42
43#include <asm/system.h>
44
45#include "nfs4_fs.h"
46#include "callback.h"
47#include "delegation.h"
48#include "iostat.h"
49#include "internal.h"
14727281 50#include "fscache.h"
24c8dbbb
DH		 51
52#define NFSDBG_FACILITY NFSDBG_CLIENT
53
54static DEFINE_SPINLOCK(nfs_client_lock);
55static LIST_HEAD(nfs_client_list);
54ceac45 56static LIST_HEAD(nfs_volume_list);
24c8dbbb
DH		 57static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
58
5006a76c
DH		 59/*
60 * RPC cruft for NFS
61 */
62static struct rpc_version *nfs_version[5] = {
63 [2] = &nfs_version2,
64#ifdef CONFIG_NFS_V3
65 [3] = &nfs_version3,
66#endif
67#ifdef CONFIG_NFS_V4
68 [4] = &nfs_version4,
69#endif
70};
71
72struct rpc_program nfs_program = {
73 .name = "nfs",
74 .number = NFS_PROGRAM,
75 .nrvers = ARRAY_SIZE(nfs_version),
76 .version = nfs_version,
77 .stats = &nfs_rpcstat,
78 .pipe_dir_name = "/nfs",
79};
80
81struct rpc_stat nfs_rpcstat = {
82 .program = &nfs_program
83};
84
85
86#ifdef CONFIG_NFS_V3_ACL
87static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
88static struct rpc_version * nfsacl_version[] = {
89 [3] = &nfsacl_version3,
90};
91
92struct rpc_program nfsacl_program = {
93 .name = "nfsacl",
94 .number = NFS_ACL_PROGRAM,
95 .nrvers = ARRAY_SIZE(nfsacl_version),
96 .version = nfsacl_version,
97 .stats = &nfsacl_rpcstat,
98};
99#endif /* CONFIG_NFS_V3_ACL */
100
3a498026
TM		 101struct nfs_client_initdata {
102 const char *hostname;
d7422c47 103 const struct sockaddr *addr;
6e4cffd7 104 size_t addrlen;
40c55319 105 const struct nfs_rpc_ops *rpc_ops;
59dca3b2 106 int proto;
5aae4a9a 107 u32 minorversion;
3a498026
TM		 108};
109
24c8dbbb
DH		 110/*
111 * Allocate a shared client record
112 *
113 * Since these are allocated/deallocated very rarely, we don't
114 * bother putting them in a slab cache...
115 */
3a498026 116static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
24c8dbbb
DH		 117{
118 struct nfs_client *clp;
7c67db3a 119 struct rpc_cred *cred;
a21bdd9b 120 int err = -ENOMEM;
24c8dbbb
DH		 121
122 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
123 goto error_0;
124
40c55319
TM		 125 clp->rpc_ops = cl_init->rpc_ops;
126
24c8dbbb
DH		 127 atomic_set(&clp->cl_count, 1);
128 clp->cl_cons_state = NFS_CS_INITING;
129
6e4cffd7
CL		 130 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
131 clp->cl_addrlen = cl_init->addrlen;
24c8dbbb 132
3a498026 133 if (cl_init->hostname) {
a21bdd9b 134 err = -ENOMEM;
3a498026 135 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
24c8dbbb 136 if (!clp->cl_hostname)
71468513 137 goto error_cleanup;
24c8dbbb
DH		 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;
5aae4a9a 152 clp->cl_minorversion = cl_init->minorversion;
24c8dbbb 153#endif
7c67db3a
TM		 154 cred = rpc_lookup_machine_cred();
155 if (!IS_ERR(cred))
156 clp->cl_machine_cred = cred;
24c8dbbb 157
14727281
DH		 158 nfs_fscache_get_client_cookie(clp);
159
24c8dbbb
DH		 160 return clp;
161
71468513 162error_cleanup:
24c8dbbb
DH		 163 kfree(clp);
164error_0:
a21bdd9b 165 return ERR_PTR(err);
24c8dbbb
DH		 166}
167
5dd3177a 168#ifdef CONFIG_NFS_V4
557134a3
AA		 169/*
170 * Clears/puts all minor version specific parts from an nfs_client struct
171 * reverting it to minorversion 0.
172 */
173static void nfs4_clear_client_minor_version(struct nfs_client *clp)
174{
175#ifdef CONFIG_NFS_V4_1
176 if (nfs4_has_session(clp)) {
177 nfs4_destroy_session(clp->cl_session);
178 clp->cl_session = NULL;
179 }
cccef3b9
AA		 180
181 clp->cl_call_sync = _nfs4_call_sync;
557134a3 182#endif /* CONFIG_NFS_V4_1 */
888ef2e3 183}
71468513 184
888ef2e3
AB		 185/*
186 * Destroy the NFS4 callback service
187 */
188static void nfs4_destroy_callback(struct nfs_client *clp)
189{
190 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
191 nfs_callback_down(clp->cl_minorversion);
192}
193
194static void nfs4_shutdown_client(struct nfs_client *clp)
195{
196 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
197 nfs4_kill_renewd(clp);
198 nfs4_clear_client_minor_version(clp);
71468513 199 nfs4_destroy_callback(clp);
888ef2e3
AB		 200 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
201 nfs_idmap_delete(clp);
202
203 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
557134a3 204}
888ef2e3
AB		 205#else
206static void nfs4_shutdown_client(struct nfs_client *clp)
207{
208}
209#endif /* CONFIG_NFS_V4 */
557134a3 210
24c8dbbb
DH		 211/*
212 * Destroy a shared client record
213 */
214static void nfs_free_client(struct nfs_client *clp)
215{
40c55319 216 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
24c8dbbb 217
5dd3177a 218 nfs4_shutdown_client(clp);
24c8dbbb 219
14727281
DH		 220 nfs_fscache_release_client_cookie(clp);
221
24c8dbbb
DH		 222 /* -EIO all pending I/O */
223 if (!IS_ERR(clp->cl_rpcclient))
224 rpc_shutdown_client(clp->cl_rpcclient);
225
7c67db3a
TM		 226 if (clp->cl_machine_cred != NULL)
227 put_rpccred(clp->cl_machine_cred);
228
24c8dbbb
DH		 229 kfree(clp->cl_hostname);
230 kfree(clp);
231
232 dprintk("<-- nfs_free_client()\n");
233}
234
235/*
236 * Release a reference to a shared client record
237 */
238void nfs_put_client(struct nfs_client *clp)
239{
27ba8512
DH		 240 if (!clp)
241 return;
242
24c8dbbb
DH		 243 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
244
245 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
246 list_del(&clp->cl_share_link);
247 spin_unlock(&nfs_client_lock);
248
249 BUG_ON(!list_empty(&clp->cl_superblocks));
250
251 nfs_free_client(clp);
252 }
253}
254
9082a5cc 255#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
9f4c899c
TM		 256/*
257 * Test if two ip6 socket addresses refer to the same socket by
258 * comparing relevant fields. The padding bytes specifically, are not
259 * compared. sin6_flowinfo is not compared because it only affects QoS
260 * and sin6_scope_id is only compared if the address is "link local"
261 * because "link local" addresses need only be unique to a specific
262 * link. Conversely, ordinary unicast addresses might have different
263 * sin6_scope_id.
264 *
265 * The caller should ensure both socket addresses are AF_INET6.
266 */
3c8c45df
CL		 267static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
268 const struct sockaddr *sa2)
9f4c899c 269{
3c8c45df
CL		 270 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
271 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
9f4c899c 272
3c8c45df
CL		 273 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
274 sin1->sin6_scope_id != sin2->sin6_scope_id)
9f4c899c 275 return 0;
3b0d3f93 276
3c8c45df 277 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
3b0d3f93 278}
3c8c45df
CL		 279#else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
280static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
281 const struct sockaddr *sa2)
9f4c899c
TM		 282{
283 return 0;
284}
9082a5cc 285#endif
3b0d3f93 286
d7371c41
ID		 287/*
288 * Test if two ip4 socket addresses refer to the same socket, by
289 * comparing relevant fields. The padding bytes specifically, are
290 * not compared.
291 *
292 * The caller should ensure both socket addresses are AF_INET.
293 */
3c8c45df
CL		 294static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
295 const struct sockaddr *sa2)
296{
297 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
298 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
299
300 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
301}
302
303static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
304 const struct sockaddr *sa2)
305{
306 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
307 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
308
309 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
310 (sin1->sin6_port == sin2->sin6_port);
311}
312
9f4c899c
TM		 313static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
314 const struct sockaddr *sa2)
d7371c41 315{
3c8c45df
CL		 316 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
317 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
9f4c899c 318
3c8c45df
CL		 319 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
320 (sin1->sin_port == sin2->sin_port);
321}
322
323/*
324 * Test if two socket addresses represent the same actual socket,
325 * by comparing (only) relevant fields, excluding the port number.
326 */
327static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
328 const struct sockaddr *sa2)
329{
330 if (sa1->sa_family != sa2->sa_family)
d7371c41 331 return 0;
3c8c45df
CL		 332
333 switch (sa1->sa_family) {
334 case AF_INET:
335 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
336 case AF_INET6:
337 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
338 }
339 return 0;
d7371c41
ID		 340}
341
d7371c41
ID		 342/*
343 * Test if two socket addresses represent the same actual socket,
3c8c45df 344 * by comparing (only) relevant fields, including the port number.
d7371c41
ID		 345 */
346static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
347 const struct sockaddr *sa2)
348{
349 if (sa1->sa_family != sa2->sa_family)
350 return 0;
351
352 switch (sa1->sa_family) {
353 case AF_INET:
9f4c899c 354 return nfs_sockaddr_cmp_ip4(sa1, sa2);
d7371c41 355 case AF_INET6:
9f4c899c 356 return nfs_sockaddr_cmp_ip6(sa1, sa2);
d7371c41
ID		 357 }
358 return 0;
359}
360
24c8dbbb 361/*
c81468a1
TM		 362 * Find a client by IP address and protocol version
363 * - returns NULL if no such client
24c8dbbb 364 */
ff052645 365struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
24c8dbbb
DH		 366{
367 struct nfs_client *clp;
368
c81468a1 369 spin_lock(&nfs_client_lock);
24c8dbbb 370 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
3b0d3f93
TM		 371 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
372
13bbc06a 373 /* Don't match clients that failed to initialise properly */
76db6d95
AA		 374 if (!(clp->cl_cons_state == NFS_CS_READY ||
375 clp->cl_cons_state == NFS_CS_SESSION_INITING))
13bbc06a
TM		 376 continue;
377
24c8dbbb 378 /* Different NFS versions cannot share the same nfs_client */
40c55319 379 if (clp->rpc_ops->version != nfsversion)
24c8dbbb
DH		 380 continue;
381
c81468a1 382 /* Match only the IP address, not the port number */
3b0d3f93 383 if (!nfs_sockaddr_match_ipaddr(addr, clap))
24c8dbbb
DH		 384 continue;
385
c81468a1
TM		 386 atomic_inc(&clp->cl_count);
387 spin_unlock(&nfs_client_lock);
388 return clp;
24c8dbbb 389 }
c81468a1 390 spin_unlock(&nfs_client_lock);
24c8dbbb 391 return NULL;
24c8dbbb
DH		 392}
393
3fbd67ad
TM		 394/*
395 * Find a client by IP address and protocol version
396 * - returns NULL if no such client
397 */
398struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
399{
400 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
401 u32 nfsvers = clp->rpc_ops->version;
402
403 spin_lock(&nfs_client_lock);
404 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
405 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
406
407 /* Don't match clients that failed to initialise properly */
408 if (clp->cl_cons_state != NFS_CS_READY)
409 continue;
410
411 /* Different NFS versions cannot share the same nfs_client */
412 if (clp->rpc_ops->version != nfsvers)
413 continue;
414
3fbd67ad
TM		 415 /* Match only the IP address, not the port number */
416 if (!nfs_sockaddr_match_ipaddr(sap, clap))
417 continue;
418
419 atomic_inc(&clp->cl_count);
420 spin_unlock(&nfs_client_lock);
421 return clp;
422 }
423 spin_unlock(&nfs_client_lock);
424 return NULL;
425}
426
24c8dbbb 427/*
c81468a1
TM		 428 * Find an nfs_client on the list that matches the initialisation data
429 * that is supplied.
24c8dbbb 430 */
c81468a1 431static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
24c8dbbb
DH		 432{
433 struct nfs_client *clp;
d7371c41 434 const struct sockaddr *sap = data->addr;
24c8dbbb 435
c81468a1 436 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
d7371c41 437 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
c81468a1
TM		 438 /* Don't match clients that failed to initialise properly */
439 if (clp->cl_cons_state < 0)
440 continue;
441
442 /* Different NFS versions cannot share the same nfs_client */
40c55319 443 if (clp->rpc_ops != data->rpc_ops)
c81468a1
TM		 444 continue;
445
59dca3b2
TM		 446 if (clp->cl_proto != data->proto)
447 continue;
5aae4a9a
BH		 448 /* Match nfsv4 minorversion */
449 if (clp->cl_minorversion != data->minorversion)
450 continue;
c81468a1 451 /* Match the full socket address */
d7371c41 452 if (!nfs_sockaddr_cmp(sap, clap))
c81468a1
TM		 453 continue;
454
455 atomic_inc(&clp->cl_count);
456 return clp;
13bbc06a 457 }
c81468a1 458 return NULL;
24c8dbbb
DH		 459}
460
461/*
462 * Look up a client by IP address and protocol version
463 * - creates a new record if one doesn't yet exist
464 */
3a498026 465static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
24c8dbbb
DH		 466{
467 struct nfs_client *clp, *new = NULL;
468 int error;
469
d7422c47
CL		 470 dprintk("--> nfs_get_client(%s,v%u)\n",
471 cl_init->hostname ?: "", cl_init->rpc_ops->version);
24c8dbbb
DH		 472
473 /* see if the client already exists */
474 do {
475 spin_lock(&nfs_client_lock);
476
c81468a1 477 clp = nfs_match_client(cl_init);
24c8dbbb
DH		 478 if (clp)
479 goto found_client;
480 if (new)
481 goto install_client;
482
483 spin_unlock(&nfs_client_lock);
484
3a498026 485 new = nfs_alloc_client(cl_init);
a21bdd9b 486 } while (!IS_ERR(new));
24c8dbbb 487
a21bdd9b
CL		 488 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
489 return new;
24c8dbbb
DH		 490
491 /* install a new client and return with it unready */
492install_client:
493 clp = new;
494 list_add(&clp->cl_share_link, &nfs_client_list);
495 spin_unlock(&nfs_client_lock);
496 dprintk("--> nfs_get_client() = %p [new]\n", clp);
497 return clp;
498
499 /* found an existing client
500 * - make sure it's ready before returning
501 */
502found_client:
503 spin_unlock(&nfs_client_lock);
504
505 if (new)
506 nfs_free_client(new);
507
150030b7 508 error = wait_event_killable(nfs_client_active_wq,
76db6d95 509 clp->cl_cons_state < NFS_CS_INITING);
0bae89ec
TM		 510 if (error < 0) {
511 nfs_put_client(clp);
512 return ERR_PTR(-ERESTARTSYS);
24c8dbbb
DH		 513 }
514
515 if (clp->cl_cons_state < NFS_CS_READY) {
516 error = clp->cl_cons_state;
517 nfs_put_client(clp);
518 return ERR_PTR(error);
519 }
520
54ceac45
DH		 521 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
522
24c8dbbb
DH		 523 dprintk("--> nfs_get_client() = %p [share]\n", clp);
524 return clp;
525}
526
527/*
528 * Mark a server as ready or failed
529 */
76db6d95 530void nfs_mark_client_ready(struct nfs_client *clp, int state)
24c8dbbb
DH		 531{
532 clp->cl_cons_state = state;
533 wake_up_all(&nfs_client_active_wq);
534}
5006a76c 535
008f55d0
BH		 536/*
537 * With sessions, the client is not marked ready until after a
538 * successful EXCHANGE_ID and CREATE_SESSION.
539 *
540 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
541 * other versions of NFS can be tried.
542 */
543int nfs4_check_client_ready(struct nfs_client *clp)
544{
545 if (!nfs4_has_session(clp))
546 return 0;
547 if (clp->cl_cons_state < NFS_CS_READY)
548 return -EPROTONOSUPPORT;
549 return 0;
550}
551
5006a76c
DH		 552/*
553 * Initialise the timeout values for a connection
554 */
555static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
556 unsigned int timeo, unsigned int retrans)
557{
558 to->to_initval = timeo * HZ / 10;
559 to->to_retries = retrans;
5006a76c
DH		 560
561 switch (proto) {
0896a725 562 case XPRT_TRANSPORT_TCP:
2cf7ff7a 563 case XPRT_TRANSPORT_RDMA:
259875ef
TM		 564 if (to->to_retries == 0)
565 to->to_retries = NFS_DEF_TCP_RETRANS;
7a3e3e18 566 if (to->to_initval == 0)
259875ef 567 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
5006a76c
DH		 568 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
569 to->to_initval = NFS_MAX_TCP_TIMEOUT;
570 to->to_increment = to->to_initval;
571 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
7a3e3e18
TM		 572 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
573 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
574 if (to->to_maxval < to->to_initval)
575 to->to_maxval = to->to_initval;
5006a76c
DH		 576 to->to_exponential = 0;
577 break;
0896a725 578 case XPRT_TRANSPORT_UDP:
259875ef
TM		 579 if (to->to_retries == 0)
580 to->to_retries = NFS_DEF_UDP_RETRANS;
5006a76c 581 if (!to->to_initval)
259875ef 582 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
5006a76c
DH		 583 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
584 to->to_initval = NFS_MAX_UDP_TIMEOUT;
585 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
586 to->to_exponential = 1;
587 break;
259875ef
TM		 588 default:
589 BUG();
5006a76c
DH		 590 }
591}
592
593/*
594 * Create an RPC client handle
595 */
59dca3b2 596static int nfs_create_rpc_client(struct nfs_client *clp,
33170233
TM		 597 const struct rpc_timeout *timeparms,
598 rpc_authflavor_t flavor,
4a01b8a4 599 int discrtry, int noresvport)
5006a76c 600{
5006a76c 601 struct rpc_clnt *clnt = NULL;
41877d20 602 struct rpc_create_args args = {
59dca3b2 603 .protocol = clp->cl_proto,
41877d20 604 .address = (struct sockaddr *)&clp->cl_addr,
6e4cffd7 605 .addrsize = clp->cl_addrlen,
33170233 606 .timeout = timeparms,
41877d20
CL		 607 .servername = clp->cl_hostname,
608 .program = &nfs_program,
609 .version = clp->rpc_ops->version,
610 .authflavor = flavor,
611 };
5006a76c 612
4a01b8a4
CL		 613 if (discrtry)
614 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
615 if (noresvport)
616 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
617
5006a76c
DH		 618 if (!IS_ERR(clp->cl_rpcclient))
619 return 0;
620
41877d20 621 clnt = rpc_create(&args);
5006a76c
DH		 622 if (IS_ERR(clnt)) {
623 dprintk("%s: cannot create RPC client. Error = %ld\n",
3110ff80 624 __func__, PTR_ERR(clnt));
5006a76c
DH		 625 return PTR_ERR(clnt);
626 }
627
5006a76c
DH		 628 clp->cl_rpcclient = clnt;
629 return 0;
630}
54ceac45
DH		 631
632/*
633 * Version 2 or 3 client destruction
634 */
635static void nfs_destroy_server(struct nfs_server *server)
636{
54ceac45 637 if (!(server->flags & NFS_MOUNT_NONLM))
9289e7f9 638 nlmclnt_done(server->nlm_host);
54ceac45
DH		 639}
640
641/*
642 * Version 2 or 3 lockd setup
643 */
644static int nfs_start_lockd(struct nfs_server *server)
645{
9289e7f9
CL		 646 struct nlm_host *host;
647 struct nfs_client *clp = server->nfs_client;
883bb163
CL		 648 struct nlmclnt_initdata nlm_init = {
649 .hostname = clp->cl_hostname,
650 .address = (struct sockaddr *)&clp->cl_addr,
651 .addrlen = clp->cl_addrlen,
883bb163 652 .nfs_version = clp->rpc_ops->version,
0cb2659b
CL		 653 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
654 1 : 0,
883bb163 655 };
54ceac45 656
883bb163 657 if (nlm_init.nfs_version > 3)
9289e7f9 658 return 0;
54ceac45 659 if (server->flags & NFS_MOUNT_NONLM)
9289e7f9
CL		 660 return 0;
661
8a6e5deb
TM		 662 switch (clp->cl_proto) {
663 default:
664 nlm_init.protocol = IPPROTO_TCP;
665 break;
666 case XPRT_TRANSPORT_UDP:
667 nlm_init.protocol = IPPROTO_UDP;
668 }
669
883bb163 670 host = nlmclnt_init(&nlm_init);
9289e7f9
CL		 671 if (IS_ERR(host))
672 return PTR_ERR(host);
673
674 server->nlm_host = host;
675 server->destroy = nfs_destroy_server;
676 return 0;
54ceac45
DH		 677}
678
679/*
680 * Initialise an NFSv3 ACL client connection
681 */
682#ifdef CONFIG_NFS_V3_ACL
683static void nfs_init_server_aclclient(struct nfs_server *server)
684{
40c55319 685 if (server->nfs_client->rpc_ops->version != 3)
54ceac45
DH		 686 goto out_noacl;
687 if (server->flags & NFS_MOUNT_NOACL)
688 goto out_noacl;
689
690 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
691 if (IS_ERR(server->client_acl))
692 goto out_noacl;
693
694 /* No errors! Assume that Sun nfsacls are supported */
695 server->caps |= NFS_CAP_ACLS;
696 return;
697
698out_noacl:
699 server->caps &= ~NFS_CAP_ACLS;
700}
701#else
702static inline void nfs_init_server_aclclient(struct nfs_server *server)
703{
704 server->flags &= ~NFS_MOUNT_NOACL;
705 server->caps &= ~NFS_CAP_ACLS;
706}
707#endif
708
709/*
710 * Create a general RPC client
711 */
33170233
TM		 712static int nfs_init_server_rpcclient(struct nfs_server *server,
713 const struct rpc_timeout *timeo,
714 rpc_authflavor_t pseudoflavour)
54ceac45
DH		 715{
716 struct nfs_client *clp = server->nfs_client;
717
718 server->client = rpc_clone_client(clp->cl_rpcclient);
719 if (IS_ERR(server->client)) {
3110ff80 720 dprintk("%s: couldn't create rpc_client!\n", __func__);
54ceac45
DH		 721 return PTR_ERR(server->client);
722 }
723
33170233
TM		 724 memcpy(&server->client->cl_timeout_default,
725 timeo,
726 sizeof(server->client->cl_timeout_default));
727 server->client->cl_timeout = &server->client->cl_timeout_default;
728
54ceac45
DH		 729 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
730 struct rpc_auth *auth;
731
732 auth = rpcauth_create(pseudoflavour, server->client);
733 if (IS_ERR(auth)) {
3110ff80 734 dprintk("%s: couldn't create credcache!\n", __func__);
54ceac45
DH		 735 return PTR_ERR(auth);
736 }
737 }
738 server->client->cl_softrtry = 0;
739 if (server->flags & NFS_MOUNT_SOFT)
740 server->client->cl_softrtry = 1;
741
54ceac45
DH		 742 return 0;
743}
744
745/*
746 * Initialise an NFS2 or NFS3 client
747 */
2283f8d6 748static int nfs_init_client(struct nfs_client *clp,
33170233 749 const struct rpc_timeout *timeparms,
2283f8d6 750 const struct nfs_parsed_mount_data *data)
54ceac45 751{
54ceac45
DH		 752 int error;
753
754 if (clp->cl_cons_state == NFS_CS_READY) {
755 /* the client is already initialised */
756 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
757 return 0;
758 }
759
54ceac45
DH		 760 /*
761 * Create a client RPC handle for doing FSSTAT with UNIX auth only
762 * - RFC 2623, sec 2.3.2
763 */
d740351b
CL		 764 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
765 0, data->flags & NFS_MOUNT_NORESVPORT);
54ceac45
DH		 766 if (error < 0)
767 goto error;
768 nfs_mark_client_ready(clp, NFS_CS_READY);
769 return 0;
770
771error:
772 nfs_mark_client_ready(clp, error);
773 dprintk("<-- nfs_init_client() = xerror %d\n", error);
774 return error;
775}
776
777/*
778 * Create a version 2 or 3 client
779 */
2283f8d6
TT		 780static int nfs_init_server(struct nfs_server *server,
781 const struct nfs_parsed_mount_data *data)
54ceac45 782{
3a498026
TM		 783 struct nfs_client_initdata cl_init = {
784 .hostname = data->nfs_server.hostname,
d7422c47 785 .addr = (const struct sockaddr *)&data->nfs_server.address,
4c568017 786 .addrlen = data->nfs_server.addrlen,
40c55319 787 .rpc_ops = &nfs_v2_clientops,
59dca3b2 788 .proto = data->nfs_server.protocol,
3a498026 789 };
33170233 790 struct rpc_timeout timeparms;
54ceac45 791 struct nfs_client *clp;
3a498026 792 int error;
54ceac45
DH		 793
794 dprintk("--> nfs_init_server()\n");
795
796#ifdef CONFIG_NFS_V3
8a6e5deb 797 if (data->version == 3)
40c55319 798 cl_init.rpc_ops = &nfs_v3_clientops;
54ceac45
DH		 799#endif
800
801 /* Allocate or find a client reference we can use */
3a498026 802 clp = nfs_get_client(&cl_init);
54ceac45
DH		 803 if (IS_ERR(clp)) {
804 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
805 return PTR_ERR(clp);
806 }
807
33170233
TM		 808 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
809 data->timeo, data->retrans);
810 error = nfs_init_client(clp, &timeparms, data);
54ceac45
DH		 811 if (error < 0)
812 goto error;
813
814 server->nfs_client = clp;
815
816 /* Initialise the client representation from the mount data */
ff3525a5 817 server->flags = data->flags;
b797cac7 818 server->options = data->options;
62ab460c
TM		 819 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
820 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
821 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
54ceac45
DH		 822
823 if (data->rsize)
824 server->rsize = nfs_block_size(data->rsize, NULL);
825 if (data->wsize)
826 server->wsize = nfs_block_size(data->wsize, NULL);
827
828 server->acregmin = data->acregmin * HZ;
829 server->acregmax = data->acregmax * HZ;
830 server->acdirmin = data->acdirmin * HZ;
831 server->acdirmax = data->acdirmax * HZ;
832
833 /* Start lockd here, before we might error out */
834 error = nfs_start_lockd(server);
835 if (error < 0)
836 goto error;
837
f22d6d79
CL		 838 server->port = data->nfs_server.port;
839
33170233 840 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
54ceac45
DH		 841 if (error < 0)
842 goto error;
843
3f8400d1
CL		 844 /* Preserve the values of mount_server-related mount options */
845 if (data->mount_server.addrlen) {
846 memcpy(&server->mountd_address, &data->mount_server.address,
847 data->mount_server.addrlen);
848 server->mountd_addrlen = data->mount_server.addrlen;
849 }
850 server->mountd_version = data->mount_server.version;
851 server->mountd_port = data->mount_server.port;
852 server->mountd_protocol = data->mount_server.protocol;
853
54ceac45
DH		 854 server->namelen = data->namlen;
855 /* Create a client RPC handle for the NFSv3 ACL management interface */
856 nfs_init_server_aclclient(server);
54ceac45
DH		 857 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
858 return 0;
859
860error:
861 server->nfs_client = NULL;
862 nfs_put_client(clp);
863 dprintk("<-- nfs_init_server() = xerror %d\n", error);
864 return error;
865}
866
867/*
868 * Load up the server record from information gained in an fsinfo record
869 */
870static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
871{
872 unsigned long max_rpc_payload;
873
874 /* Work out a lot of parameters */
875 if (server->rsize == 0)
876 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
877 if (server->wsize == 0)
878 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
879
880 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
881 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
882 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
883 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
884
885 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
886 if (server->rsize > max_rpc_payload)
887 server->rsize = max_rpc_payload;
888 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
889 server->rsize = NFS_MAX_FILE_IO_SIZE;
890 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
e0bf68dd 891
d993831f 892 server->backing_dev_info.name = "nfs";
54ceac45
DH		 893 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
894
895 if (server->wsize > max_rpc_payload)
896 server->wsize = max_rpc_payload;
897 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
898 server->wsize = NFS_MAX_FILE_IO_SIZE;
899 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
900 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
901
902 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
903 if (server->dtsize > PAGE_CACHE_SIZE)
904 server->dtsize = PAGE_CACHE_SIZE;
905 if (server->dtsize > server->rsize)
906 server->dtsize = server->rsize;
907
908 if (server->flags & NFS_MOUNT_NOAC) {
909 server->acregmin = server->acregmax = 0;
910 server->acdirmin = server->acdirmax = 0;
911 }
912
913 server->maxfilesize = fsinfo->maxfilesize;
914
915 /* We're airborne Set socket buffersize */
916 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
917}
918
919/*
920 * Probe filesystem information, including the FSID on v2/v3
921 */
922static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
923{
924 struct nfs_fsinfo fsinfo;
925 struct nfs_client *clp = server->nfs_client;
926 int error;
927
928 dprintk("--> nfs_probe_fsinfo()\n");
929
930 if (clp->rpc_ops->set_capabilities != NULL) {
931 error = clp->rpc_ops->set_capabilities(server, mntfh);
932 if (error < 0)
933 goto out_error;
934 }
935
936 fsinfo.fattr = fattr;
937 nfs_fattr_init(fattr);
938 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
939 if (error < 0)
940 goto out_error;
941
942 nfs_server_set_fsinfo(server, &fsinfo);
943
944 /* Get some general file system info */
945 if (server->namelen == 0) {
946 struct nfs_pathconf pathinfo;
947
948 pathinfo.fattr = fattr;
949 nfs_fattr_init(fattr);
950
951 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
952 server->namelen = pathinfo.max_namelen;
953 }
954
955 dprintk("<-- nfs_probe_fsinfo() = 0\n");
956 return 0;
957
958out_error:
959 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
960 return error;
961}
962
963/*
964 * Copy useful information when duplicating a server record
965 */
966static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
967{
968 target->flags = source->flags;
356e76b8
CL		 969 target->rsize = source->rsize;
970 target->wsize = source->wsize;
54ceac45
DH		 971 target->acregmin = source->acregmin;
972 target->acregmax = source->acregmax;
973 target->acdirmin = source->acdirmin;
974 target->acdirmax = source->acdirmax;
975 target->caps = source->caps;
2df54806 976 target->options = source->options;
54ceac45
DH		 977}
978
979/*
980 * Allocate and initialise a server record
981 */
982static struct nfs_server *nfs_alloc_server(void)
983{
984 struct nfs_server *server;
985
986 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
987 if (!server)
988 return NULL;
989
990 server->client = server->client_acl = ERR_PTR(-EINVAL);
991
992 /* Zero out the NFS state stuff */
993 INIT_LIST_HEAD(&server->client_link);
994 INIT_LIST_HEAD(&server->master_link);
995
ef818a28
SD		 996 atomic_set(&server->active, 0);
997
54ceac45
DH		 998 server->io_stats = nfs_alloc_iostats();
999 if (!server->io_stats) {
1000 kfree(server);
1001 return NULL;
1002 }
1003
48d07649
JA		 1004 if (bdi_init(&server->backing_dev_info)) {
1005 nfs_free_iostats(server->io_stats);
1006 kfree(server);
1007 return NULL;
1008 }
1009
54ceac45
DH		 1010 return server;
1011}
1012
1013/*
1014 * Free up a server record
1015 */
1016void nfs_free_server(struct nfs_server *server)
1017{
1018 dprintk("--> nfs_free_server()\n");
1019
1020 spin_lock(&nfs_client_lock);
1021 list_del(&server->client_link);
1022 list_del(&server->master_link);
1023 spin_unlock(&nfs_client_lock);
1024
1025 if (server->destroy != NULL)
1026 server->destroy(server);
5cef338b
TM		 1027
1028 if (!IS_ERR(server->client_acl))
1029 rpc_shutdown_client(server->client_acl);
54ceac45
DH		 1030 if (!IS_ERR(server->client))
1031 rpc_shutdown_client(server->client);
1032
1033 nfs_put_client(server->nfs_client);
1034
1035 nfs_free_iostats(server->io_stats);
e0bf68dd 1036 bdi_destroy(&server->backing_dev_info);
54ceac45
DH		 1037 kfree(server);
1038 nfs_release_automount_timer();
1039 dprintk("<-- nfs_free_server()\n");
1040}
1041
1042/*
1043 * Create a version 2 or 3 volume record
1044 * - keyed on server and FSID
1045 */
2283f8d6 1046struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
54ceac45
DH		 1047 struct nfs_fh *mntfh)
1048{
1049 struct nfs_server *server;
1050 struct nfs_fattr fattr;
1051 int error;
1052
1053 server = nfs_alloc_server();
1054 if (!server)
1055 return ERR_PTR(-ENOMEM);
1056
1057 /* Get a client representation */
1058 error = nfs_init_server(server, data);
1059 if (error < 0)
1060 goto error;
1061
1062 BUG_ON(!server->nfs_client);
1063 BUG_ON(!server->nfs_client->rpc_ops);
1064 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1065
1066 /* Probe the root fh to retrieve its FSID */
1067 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1068 if (error < 0)
1069 goto error;
54af3bb5
TM		 1070 if (server->nfs_client->rpc_ops->version == 3) {
1071 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1072 server->namelen = NFS3_MAXNAMLEN;
1073 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1074 server->caps |= NFS_CAP_READDIRPLUS;
1075 } else {
1076 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1077 server->namelen = NFS2_MAXNAMLEN;
1078 }
1079
54ceac45
DH		 1080 if (!(fattr.valid & NFS_ATTR_FATTR)) {
1081 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
1082 if (error < 0) {
1083 dprintk("nfs_create_server: getattr error = %d\n", -error);
1084 goto error;
1085 }
1086 }
1087 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
1088
6daabf1b
DH		 1089 dprintk("Server FSID: %llx:%llx\n",
1090 (unsigned long long) server->fsid.major,
1091 (unsigned long long) server->fsid.minor);
54ceac45 1092
54ceac45
DH		 1093 spin_lock(&nfs_client_lock);
1094 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1095 list_add_tail(&server->master_link, &nfs_volume_list);
1096 spin_unlock(&nfs_client_lock);
1097
1098 server->mount_time = jiffies;
1099 return server;
1100
1101error:
1102 nfs_free_server(server);
1103 return ERR_PTR(error);
1104}
1105
1106#ifdef CONFIG_NFS_V4
9bdaa86d
BH		 1107/*
1108 * Initialize the NFS4 callback service
1109 */
1110static int nfs4_init_callback(struct nfs_client *clp)
1111{
1112 int error;
1113
1114 if (clp->rpc_ops->version == 4) {
0b5b7ae0
AA		 1115 if (nfs4_has_session(clp)) {
1116 error = xprt_setup_backchannel(
1117 clp->cl_rpcclient->cl_xprt,
1118 NFS41_BC_MIN_CALLBACKS);
1119 if (error < 0)
1120 return error;
1121 }
1122
71468513
BH		 1123 error = nfs_callback_up(clp->cl_minorversion,
1124 clp->cl_rpcclient->cl_xprt);
9bdaa86d
BH		 1125 if (error < 0) {
1126 dprintk("%s: failed to start callback. Error = %d\n",
1127 __func__, error);
1128 return error;
1129 }
1130 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1131 }
1132 return 0;
1133}
1134
557134a3
AA		 1135/*
1136 * Initialize the minor version specific parts of an NFS4 client record
1137 */
1138static int nfs4_init_client_minor_version(struct nfs_client *clp)
1139{
cccef3b9
AA		 1140 clp->cl_call_sync = _nfs4_call_sync;
1141
557134a3
AA		 1142#if defined(CONFIG_NFS_V4_1)
1143 if (clp->cl_minorversion) {
1144 struct nfs4_session *session = NULL;
1145 /*
1146 * Create the session and mark it expired.
1147 * When a SEQUENCE operation encounters the expired session
1148 * it will do session recovery to initialize it.
1149 */
1150 session = nfs4_alloc_session(clp);
1151 if (!session)
1152 return -ENOMEM;
1153
1154 clp->cl_session = session;
cccef3b9 1155 clp->cl_call_sync = _nfs4_call_sync_session;
557134a3
AA		 1156 }
1157#endif /* CONFIG_NFS_V4_1 */
1158
71468513 1159 return nfs4_init_callback(clp);
557134a3
AA		 1160}
1161
54ceac45
DH		 1162/*
1163 * Initialise an NFS4 client record
1164 */
1165static int nfs4_init_client(struct nfs_client *clp,
33170233 1166 const struct rpc_timeout *timeparms,
7d9ac06f 1167 const char *ip_addr,
d740351b
CL		 1168 rpc_authflavor_t authflavour,
1169 int flags)
54ceac45
DH		 1170{
1171 int error;
1172
1173 if (clp->cl_cons_state == NFS_CS_READY) {
1174 /* the client is initialised already */
1175 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1176 return 0;
1177 }
1178
1179 /* Check NFS protocol revision and initialize RPC op vector */
1180 clp->rpc_ops = &nfs_v4_clientops;
1181
59dca3b2 1182 error = nfs_create_rpc_client(clp, timeparms, authflavour,
d740351b 1183 1, flags & NFS_MOUNT_NORESVPORT);
54ceac45
DH		 1184 if (error < 0)
1185 goto error;
f4373bf9 1186 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
54ceac45
DH		 1187
1188 error = nfs_idmap_new(clp);
1189 if (error < 0) {
1190 dprintk("%s: failed to create idmapper. Error = %d\n",
3110ff80 1191 __func__, error);
54ceac45
DH		 1192 goto error;
1193 }
9c5bf38d 1194 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
54ceac45 1195
557134a3
AA		 1196 error = nfs4_init_client_minor_version(clp);
1197 if (error < 0)
1198 goto error;
1199
76db6d95
AA		 1200 if (!nfs4_has_session(clp))
1201 nfs_mark_client_ready(clp, NFS_CS_READY);
54ceac45
DH		 1202 return 0;
1203
1204error:
1205 nfs_mark_client_ready(clp, error);
1206 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1207 return error;
1208}
1209
1210/*
1211 * Set up an NFS4 client
1212 */
1213static int nfs4_set_client(struct nfs_server *server,
dcecae0f
CL		 1214 const char *hostname,
1215 const struct sockaddr *addr,
1216 const size_t addrlen,
7d9ac06f 1217 const char *ip_addr,
54ceac45 1218 rpc_authflavor_t authflavour,
94a417f3
BH		 1219 int proto, const struct rpc_timeout *timeparms,
1220 u32 minorversion)
54ceac45 1221{
3a498026
TM		 1222 struct nfs_client_initdata cl_init = {
1223 .hostname = hostname,
dcecae0f
CL		 1224 .addr = addr,
1225 .addrlen = addrlen,
40c55319 1226 .rpc_ops = &nfs_v4_clientops,
59dca3b2 1227 .proto = proto,
5aae4a9a 1228 .minorversion = minorversion,
3a498026 1229 };
54ceac45
DH		 1230 struct nfs_client *clp;
1231 int error;
1232
1233 dprintk("--> nfs4_set_client()\n");
1234
1235 /* Allocate or find a client reference we can use */
3a498026 1236 clp = nfs_get_client(&cl_init);
54ceac45
DH		 1237 if (IS_ERR(clp)) {
1238 error = PTR_ERR(clp);
1239 goto error;
1240 }
d740351b
CL		 1241 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1242 server->flags);
54ceac45
DH		 1243 if (error < 0)
1244 goto error_put;
1245
1246 server->nfs_client = clp;
1247 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1248 return 0;
1249
1250error_put:
1251 nfs_put_client(clp);
1252error:
1253 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1254 return error;
1255}
1256
557134a3 1257
96b09e02
AA		 1258/*
1259 * Session has been established, and the client marked ready.
1260 * Set the mount rsize and wsize with negotiated fore channel
1261 * attributes which will be bound checked in nfs_server_set_fsinfo.
1262 */
1263static void nfs4_session_set_rwsize(struct nfs_server *server)
1264{
1265#ifdef CONFIG_NFS_V4_1
2449ea2e
AB		 1266 struct nfs4_session *sess;
1267 u32 server_resp_sz;
1268 u32 server_rqst_sz;
1269
96b09e02
AA		 1270 if (!nfs4_has_session(server->nfs_client))
1271 return;
2449ea2e
AB		 1272 sess = server->nfs_client->cl_session;
1273 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1274 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1275
1276 if (server->rsize > server_resp_sz)
1277 server->rsize = server_resp_sz;
1278 if (server->wsize > server_rqst_sz)
1279 server->wsize = server_rqst_sz;
96b09e02
AA		 1280#endif /* CONFIG_NFS_V4_1 */
1281}
1282
54ceac45
DH		 1283/*
1284 * Create a version 4 volume record
1285 */
1286static int nfs4_init_server(struct nfs_server *server,
91ea40b9 1287 const struct nfs_parsed_mount_data *data)
54ceac45 1288{
33170233 1289 struct rpc_timeout timeparms;
54ceac45
DH		 1290 int error;
1291
1292 dprintk("--> nfs4_init_server()\n");
1293
33170233
TM		 1294 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1295 data->timeo, data->retrans);
1296
542fcc33
CL		 1297 /* Initialise the client representation from the mount data */
1298 server->flags = data->flags;
0df5dd4a
TM		 1299 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|
1300 NFS_CAP_POSIX_LOCK;
b797cac7 1301 server->options = data->options;
542fcc33 1302
33170233
TM		 1303 /* Get a client record */
1304 error = nfs4_set_client(server,
1305 data->nfs_server.hostname,
1306 (const struct sockaddr *)&data->nfs_server.address,
1307 data->nfs_server.addrlen,
1308 data->client_address,
1309 data->auth_flavors[0],
1310 data->nfs_server.protocol,
94a417f3
BH		 1311 &timeparms,
1312 data->minorversion);
33170233
TM		 1313 if (error < 0)
1314 goto error;
1315
54ceac45
DH		 1316 if (data->rsize)
1317 server->rsize = nfs_block_size(data->rsize, NULL);
1318 if (data->wsize)
1319 server->wsize = nfs_block_size(data->wsize, NULL);
1320
1321 server->acregmin = data->acregmin * HZ;
1322 server->acregmax = data->acregmax * HZ;
1323 server->acdirmin = data->acdirmin * HZ;
1324 server->acdirmax = data->acdirmax * HZ;
1325
f22d6d79
CL		 1326 server->port = data->nfs_server.port;
1327
33170233 1328 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
54ceac45 1329
33170233 1330error:
54ceac45
DH		 1331 /* Done */
1332 dprintk("<-- nfs4_init_server() = %d\n", error);
1333 return error;
1334}
1335
1336/*
1337 * Create a version 4 volume record
1338 * - keyed on server and FSID
1339 */
91ea40b9 1340struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
54ceac45
DH		 1341 struct nfs_fh *mntfh)
1342{
1343 struct nfs_fattr fattr;
1344 struct nfs_server *server;
1345 int error;
1346
1347 dprintk("--> nfs4_create_server()\n");
1348
1349 server = nfs_alloc_server();
1350 if (!server)
1351 return ERR_PTR(-ENOMEM);
1352
54ceac45 1353 /* set up the general RPC client */
91ea40b9 1354 error = nfs4_init_server(server, data);
54ceac45
DH		 1355 if (error < 0)
1356 goto error;
1357
1358 BUG_ON(!server->nfs_client);
1359 BUG_ON(!server->nfs_client->rpc_ops);
1360 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1361
fccba804
TM		 1362 error = nfs4_init_session(server);
1363 if (error < 0)
1364 goto error;
557134a3 1365
54ceac45 1366 /* Probe the root fh to retrieve its FSID */
815409d2 1367 error = nfs4_get_rootfh(server, mntfh);
54ceac45
DH		 1368 if (error < 0)
1369 goto error;
1370
6daabf1b
DH		 1371 dprintk("Server FSID: %llx:%llx\n",
1372 (unsigned long long) server->fsid.major,
1373 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1374 dprintk("Mount FH: %d\n", mntfh->size);
1375
96b09e02
AA		 1376 nfs4_session_set_rwsize(server);
1377
54ceac45
DH		 1378 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1379 if (error < 0)
1380 goto error;
1381
54af3bb5
TM		 1382 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1383 server->namelen = NFS4_MAXNAMLEN;
1384
54ceac45
DH		 1385 spin_lock(&nfs_client_lock);
1386 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1387 list_add_tail(&server->master_link, &nfs_volume_list);
1388 spin_unlock(&nfs_client_lock);
1389
1390 server->mount_time = jiffies;
1391 dprintk("<-- nfs4_create_server() = %p\n", server);
1392 return server;
1393
1394error:
1395 nfs_free_server(server);
1396 dprintk("<-- nfs4_create_server() = error %d\n", error);
1397 return ERR_PTR(error);
1398}
1399
1400/*
1401 * Create an NFS4 referral server record
1402 */
1403struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
f2d0d85e 1404 struct nfs_fh *mntfh)
54ceac45
DH		 1405{
1406 struct nfs_client *parent_client;
1407 struct nfs_server *server, *parent_server;
1408 struct nfs_fattr fattr;
1409 int error;
1410
1411 dprintk("--> nfs4_create_referral_server()\n");
1412
1413 server = nfs_alloc_server();
1414 if (!server)
1415 return ERR_PTR(-ENOMEM);
1416
1417 parent_server = NFS_SB(data->sb);
1418 parent_client = parent_server->nfs_client;
1419
542fcc33
CL		 1420 /* Initialise the client representation from the parent server */
1421 nfs_server_copy_userdata(server, parent_server);
62ab460c 1422 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
542fcc33 1423
54ceac45
DH		 1424 /* Get a client representation.
1425 * Note: NFSv4 always uses TCP, */
dcecae0f 1426 error = nfs4_set_client(server, data->hostname,
6677d095
CL		 1427 data->addr,
1428 data->addrlen,
dcecae0f
CL		 1429 parent_client->cl_ipaddr,
1430 data->authflavor,
1431 parent_server->client->cl_xprt->prot,
94a417f3
BH		 1432 parent_server->client->cl_timeout,
1433 parent_client->cl_minorversion);
297de4f6
AA		 1434 if (error < 0)
1435 goto error;
54ceac45 1436
33170233 1437 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
54ceac45
DH		 1438 if (error < 0)
1439 goto error;
1440
1441 BUG_ON(!server->nfs_client);
1442 BUG_ON(!server->nfs_client->rpc_ops);
1443 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1444
f2d0d85e 1445 /* Probe the root fh to retrieve its FSID and filehandle */
815409d2 1446 error = nfs4_get_rootfh(server, mntfh);
f2d0d85e
TM		 1447 if (error < 0)
1448 goto error;
1449
54ceac45 1450 /* probe the filesystem info for this server filesystem */
f2d0d85e 1451 error = nfs_probe_fsinfo(server, mntfh, &fattr);
54ceac45
DH		 1452 if (error < 0)
1453 goto error;
1454
54af3bb5
TM		 1455 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1456 server->namelen = NFS4_MAXNAMLEN;
1457
54ceac45 1458 dprintk("Referral FSID: %llx:%llx\n",
6daabf1b
DH		 1459 (unsigned long long) server->fsid.major,
1460 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1461
1462 spin_lock(&nfs_client_lock);
1463 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1464 list_add_tail(&server->master_link, &nfs_volume_list);
1465 spin_unlock(&nfs_client_lock);
1466
1467 server->mount_time = jiffies;
1468
1469 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1470 return server;
1471
1472error:
1473 nfs_free_server(server);
1474 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1475 return ERR_PTR(error);
1476}
1477
1478#endif /* CONFIG_NFS_V4 */
1479
1480/*
1481 * Clone an NFS2, NFS3 or NFS4 server record
1482 */
1483struct nfs_server *nfs_clone_server(struct nfs_server *source,
1484 struct nfs_fh *fh,
1485 struct nfs_fattr *fattr)
1486{
1487 struct nfs_server *server;
1488 struct nfs_fattr fattr_fsinfo;
1489 int error;
1490
1491 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
6daabf1b
DH		 1492 (unsigned long long) fattr->fsid.major,
1493 (unsigned long long) fattr->fsid.minor);
54ceac45
DH		 1494
1495 server = nfs_alloc_server();
1496 if (!server)
1497 return ERR_PTR(-ENOMEM);
1498
1499 /* Copy data from the source */
1500 server->nfs_client = source->nfs_client;
1501 atomic_inc(&server->nfs_client->cl_count);
1502 nfs_server_copy_userdata(server, source);
1503
1504 server->fsid = fattr->fsid;
1505
33170233
TM		 1506 error = nfs_init_server_rpcclient(server,
1507 source->client->cl_timeout,
1508 source->client->cl_auth->au_flavor);
54ceac45
DH		 1509 if (error < 0)
1510 goto out_free_server;
1511 if (!IS_ERR(source->client_acl))
1512 nfs_init_server_aclclient(server);
1513
1514 /* probe the filesystem info for this server filesystem */
1515 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1516 if (error < 0)
1517 goto out_free_server;
1518
54af3bb5
TM		 1519 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1520 server->namelen = NFS4_MAXNAMLEN;
1521
54ceac45 1522 dprintk("Cloned FSID: %llx:%llx\n",
6daabf1b
DH		 1523 (unsigned long long) server->fsid.major,
1524 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1525
1526 error = nfs_start_lockd(server);
1527 if (error < 0)
1528 goto out_free_server;
1529
1530 spin_lock(&nfs_client_lock);
1531 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1532 list_add_tail(&server->master_link, &nfs_volume_list);
1533 spin_unlock(&nfs_client_lock);
1534
1535 server->mount_time = jiffies;
1536
1537 dprintk("<-- nfs_clone_server() = %p\n", server);
1538 return server;
1539
1540out_free_server:
1541 nfs_free_server(server);
1542 dprintk("<-- nfs_clone_server() = error %d\n", error);
1543 return ERR_PTR(error);
1544}
6aaca566
DH		 1545
1546#ifdef CONFIG_PROC_FS
1547static struct proc_dir_entry *proc_fs_nfs;
1548
1549static int nfs_server_list_open(struct inode *inode, struct file *file);
1550static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1551static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1552static void nfs_server_list_stop(struct seq_file *p, void *v);
1553static int nfs_server_list_show(struct seq_file *m, void *v);
1554
88e9d34c 1555static const struct seq_operations nfs_server_list_ops = {
6aaca566
DH		 1556 .start = nfs_server_list_start,
1557 .next = nfs_server_list_next,
1558 .stop = nfs_server_list_stop,
1559 .show = nfs_server_list_show,
1560};
1561
00977a59 1562static const struct file_operations nfs_server_list_fops = {
6aaca566
DH		 1563 .open = nfs_server_list_open,
1564 .read = seq_read,
1565 .llseek = seq_lseek,
1566 .release = seq_release,
34b37235 1567 .owner = THIS_MODULE,
6aaca566
DH		 1568};
1569
1570static int nfs_volume_list_open(struct inode *inode, struct file *file);
1571static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1572static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1573static void nfs_volume_list_stop(struct seq_file *p, void *v);
1574static int nfs_volume_list_show(struct seq_file *m, void *v);
1575
88e9d34c 1576static const struct seq_operations nfs_volume_list_ops = {
6aaca566
DH		 1577 .start = nfs_volume_list_start,
1578 .next = nfs_volume_list_next,
1579 .stop = nfs_volume_list_stop,
1580 .show = nfs_volume_list_show,
1581};
1582
00977a59 1583static const struct file_operations nfs_volume_list_fops = {
6aaca566
DH		 1584 .open = nfs_volume_list_open,
1585 .read = seq_read,
1586 .llseek = seq_lseek,
1587 .release = seq_release,
34b37235 1588 .owner = THIS_MODULE,
6aaca566
DH		 1589};
1590
1591/*
1592 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1593 * we're dealing
1594 */
1595static int nfs_server_list_open(struct inode *inode, struct file *file)
1596{
1597 struct seq_file *m;
1598 int ret;
1599
1600 ret = seq_open(file, &nfs_server_list_ops);
1601 if (ret < 0)
1602 return ret;
1603
1604 m = file->private_data;
1605 m->private = PDE(inode)->data;
1606
1607 return 0;
1608}
1609
1610/*
1611 * set up the iterator to start reading from the server list and return the first item
1612 */
1613static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1614{
6aaca566
DH		 1615 /* lock the list against modification */
1616 spin_lock(&nfs_client_lock);
259902ea 1617 return seq_list_start_head(&nfs_client_list, *_pos);
6aaca566
DH		 1618}
1619
1620/*
1621 * move to next server
1622 */
1623static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1624{
259902ea 1625 return seq_list_next(v, &nfs_client_list, pos);
6aaca566
DH		 1626}
1627
1628/*
1629 * clean up after reading from the transports list
1630 */
1631static void nfs_server_list_stop(struct seq_file *p, void *v)
1632{
1633 spin_unlock(&nfs_client_lock);
1634}
1635
1636/*
1637 * display a header line followed by a load of call lines
1638 */
1639static int nfs_server_list_show(struct seq_file *m, void *v)
1640{
1641 struct nfs_client *clp;
1642
1643 /* display header on line 1 */
259902ea 1644 if (v == &nfs_client_list) {
6aaca566
DH		 1645 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1646 return 0;
1647 }
1648
1649 /* display one transport per line on subsequent lines */
1650 clp = list_entry(v, struct nfs_client, cl_share_link);
1651
5d8515ca 1652 seq_printf(m, "v%u %s %s %3d %s\n",
40c55319 1653 clp->rpc_ops->version,
5d8515ca
CL		 1654 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1655 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
6aaca566
DH		 1656 atomic_read(&clp->cl_count),
1657 clp->cl_hostname);
1658
1659 return 0;
1660}
1661
1662/*
1663 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1664 */
1665static int nfs_volume_list_open(struct inode *inode, struct file *file)
1666{
1667 struct seq_file *m;
1668 int ret;
1669
1670 ret = seq_open(file, &nfs_volume_list_ops);
1671 if (ret < 0)
1672 return ret;
1673
1674 m = file->private_data;
1675 m->private = PDE(inode)->data;
1676
1677 return 0;
1678}
1679
1680/*
1681 * set up the iterator to start reading from the volume list and return the first item
1682 */
1683static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1684{
6aaca566
DH		 1685 /* lock the list against modification */
1686 spin_lock(&nfs_client_lock);
259902ea 1687 return seq_list_start_head(&nfs_volume_list, *_pos);
6aaca566
DH		 1688}
1689
1690/*
1691 * move to next volume
1692 */
1693static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1694{
259902ea 1695 return seq_list_next(v, &nfs_volume_list, pos);
6aaca566
DH		 1696}
1697
1698/*
1699 * clean up after reading from the transports list
1700 */
1701static void nfs_volume_list_stop(struct seq_file *p, void *v)
1702{
1703 spin_unlock(&nfs_client_lock);
1704}
1705
1706/*
1707 * display a header line followed by a load of call lines
1708 */
1709static int nfs_volume_list_show(struct seq_file *m, void *v)
1710{
1711 struct nfs_server *server;
1712 struct nfs_client *clp;
1713 char dev[8], fsid[17];
1714
1715 /* display header on line 1 */
259902ea 1716 if (v == &nfs_volume_list) {
5d1acff1 1717 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
6aaca566
DH		 1718 return 0;
1719 }
1720 /* display one transport per line on subsequent lines */
1721 server = list_entry(v, struct nfs_server, master_link);
1722 clp = server->nfs_client;
1723
1724 snprintf(dev, 8, "%u:%u",
1725 MAJOR(server->s_dev), MINOR(server->s_dev));
1726
1727 snprintf(fsid, 17, "%llx:%llx",
6daabf1b
DH		 1728 (unsigned long long) server->fsid.major,
1729 (unsigned long long) server->fsid.minor);
6aaca566 1730
5d1acff1 1731 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
40c55319 1732 clp->rpc_ops->version,
5d8515ca
CL		 1733 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1734 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
6aaca566 1735 dev,
5d1acff1
DH		 1736 fsid,
1737 nfs_server_fscache_state(server));
6aaca566
DH		 1738
1739 return 0;
1740}
1741
1742/*
1743 * initialise the /proc/fs/nfsfs/ directory
1744 */
1745int __init nfs_fs_proc_init(void)
1746{
1747 struct proc_dir_entry *p;
1748
36a5aeb8 1749 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
6aaca566
DH		 1750 if (!proc_fs_nfs)
1751 goto error_0;
1752
6aaca566 1753 /* a file of servers with which we're dealing */
34b37235
DL		 1754 p = proc_create("servers", S_IFREG|S_IRUGO,
1755 proc_fs_nfs, &nfs_server_list_fops);
6aaca566
DH		 1756 if (!p)
1757 goto error_1;
1758
6aaca566 1759 /* a file of volumes that we have mounted */
34b37235
DL		 1760 p = proc_create("volumes", S_IFREG|S_IRUGO,
1761 proc_fs_nfs, &nfs_volume_list_fops);
6aaca566
DH		 1762 if (!p)
1763 goto error_2;
6aaca566
DH		 1764 return 0;
1765
1766error_2:
1767 remove_proc_entry("servers", proc_fs_nfs);
1768error_1:
36a5aeb8 1769 remove_proc_entry("fs/nfsfs", NULL);
6aaca566
DH		 1770error_0:
1771 return -ENOMEM;
1772}
1773
1774/*
1775 * clean up the /proc/fs/nfsfs/ directory
1776 */
1777void nfs_fs_proc_exit(void)
1778{
1779 remove_proc_entry("volumes", proc_fs_nfs);
1780 remove_proc_entry("servers", proc_fs_nfs);
36a5aeb8 1781 remove_proc_entry("fs/nfsfs", NULL);
6aaca566
DH		 1782}
1783
1784#endif /* CONFIG_PROC_FS */
kernel source for telekom puls (alcatel/mediatek)