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Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvar...
[linux-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 39#include <linux/nfs_xdr.h>
0b5b7ae0 40#include <linux/sunrpc/bc_xprt.h>
24c8dbbb
DH		 41
42#include <asm/system.h>
43
44#include "nfs4_fs.h"
45#include "callback.h"
46#include "delegation.h"
47#include "iostat.h"
48#include "internal.h"
14727281 49#include "fscache.h"
24c8dbbb
DH		 50
51#define NFSDBG_FACILITY NFSDBG_CLIENT
52
53static DEFINE_SPINLOCK(nfs_client_lock);
54static LIST_HEAD(nfs_client_list);
54ceac45 55static LIST_HEAD(nfs_volume_list);
24c8dbbb
DH		 56static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
57
5006a76c
DH		 58/*
59 * RPC cruft for NFS
60 */
61static struct rpc_version *nfs_version[5] = {
62 [2] = &nfs_version2,
63#ifdef CONFIG_NFS_V3
64 [3] = &nfs_version3,
65#endif
66#ifdef CONFIG_NFS_V4
67 [4] = &nfs_version4,
68#endif
69};
70
71struct rpc_program nfs_program = {
72 .name = "nfs",
73 .number = NFS_PROGRAM,
74 .nrvers = ARRAY_SIZE(nfs_version),
75 .version = nfs_version,
76 .stats = &nfs_rpcstat,
77 .pipe_dir_name = "/nfs",
78};
79
80struct rpc_stat nfs_rpcstat = {
81 .program = &nfs_program
82};
83
84
85#ifdef CONFIG_NFS_V3_ACL
86static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
87static struct rpc_version * nfsacl_version[] = {
88 [3] = &nfsacl_version3,
89};
90
91struct rpc_program nfsacl_program = {
92 .name = "nfsacl",
93 .number = NFS_ACL_PROGRAM,
94 .nrvers = ARRAY_SIZE(nfsacl_version),
95 .version = nfsacl_version,
96 .stats = &nfsacl_rpcstat,
97};
98#endif /* CONFIG_NFS_V3_ACL */
99
3a498026
TM		 100struct nfs_client_initdata {
101 const char *hostname;
d7422c47 102 const struct sockaddr *addr;
6e4cffd7 103 size_t addrlen;
40c55319 104 const struct nfs_rpc_ops *rpc_ops;
59dca3b2 105 int proto;
5aae4a9a 106 u32 minorversion;
3a498026
TM		 107};
108
24c8dbbb
DH		 109/*
110 * Allocate a shared client record
111 *
112 * Since these are allocated/deallocated very rarely, we don't
113 * bother putting them in a slab cache...
114 */
3a498026 115static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
24c8dbbb
DH		 116{
117 struct nfs_client *clp;
7c67db3a 118 struct rpc_cred *cred;
a21bdd9b 119 int err = -ENOMEM;
24c8dbbb
DH		 120
121 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
122 goto error_0;
123
40c55319
TM		 124 clp->rpc_ops = cl_init->rpc_ops;
125
24c8dbbb
DH		 126 atomic_set(&clp->cl_count, 1);
127 clp->cl_cons_state = NFS_CS_INITING;
128
6e4cffd7
CL		 129 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
130 clp->cl_addrlen = cl_init->addrlen;
24c8dbbb 131
3a498026 132 if (cl_init->hostname) {
a21bdd9b 133 err = -ENOMEM;
3a498026 134 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
24c8dbbb 135 if (!clp->cl_hostname)
71468513 136 goto error_cleanup;
24c8dbbb
DH		 137 }
138
139 INIT_LIST_HEAD(&clp->cl_superblocks);
140 clp->cl_rpcclient = ERR_PTR(-EINVAL);
141
59dca3b2
TM		 142 clp->cl_proto = cl_init->proto;
143
24c8dbbb 144#ifdef CONFIG_NFS_V4
24c8dbbb 145 INIT_LIST_HEAD(&clp->cl_delegations);
24c8dbbb 146 spin_lock_init(&clp->cl_lock);
65f27f38 147 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
24c8dbbb
DH		 148 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
149 clp->cl_boot_time = CURRENT_TIME;
150 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
5aae4a9a 151 clp->cl_minorversion = cl_init->minorversion;
24c8dbbb 152#endif
7c67db3a
TM		 153 cred = rpc_lookup_machine_cred();
154 if (!IS_ERR(cred))
155 clp->cl_machine_cred = cred;
24c8dbbb 156
14727281
DH		 157 nfs_fscache_get_client_cookie(clp);
158
24c8dbbb
DH		 159 return clp;
160
71468513 161error_cleanup:
24c8dbbb
DH		 162 kfree(clp);
163error_0:
a21bdd9b 164 return ERR_PTR(err);
24c8dbbb
DH		 165}
166
5dd3177a
TM		 167static void nfs4_shutdown_client(struct nfs_client *clp)
168{
169#ifdef CONFIG_NFS_V4
170 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
171 nfs4_kill_renewd(clp);
9f958ab8 172 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
5dd3177a
TM		 173 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
174 nfs_idmap_delete(clp);
f6a1cc89
TM		 175
176 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
5dd3177a
TM		 177#endif
178}
179
9bdaa86d
BH		 180/*
181 * Destroy the NFS4 callback service
182 */
183static void nfs4_destroy_callback(struct nfs_client *clp)
184{
185#ifdef CONFIG_NFS_V4
186 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
e82dc22d 187 nfs_callback_down(clp->cl_minorversion);
9bdaa86d
BH		 188#endif /* CONFIG_NFS_V4 */
189}
190
557134a3
AA		 191/*
192 * Clears/puts all minor version specific parts from an nfs_client struct
193 * reverting it to minorversion 0.
194 */
195static void nfs4_clear_client_minor_version(struct nfs_client *clp)
196{
197#ifdef CONFIG_NFS_V4_1
198 if (nfs4_has_session(clp)) {
199 nfs4_destroy_session(clp->cl_session);
200 clp->cl_session = NULL;
201 }
cccef3b9
AA		 202
203 clp->cl_call_sync = _nfs4_call_sync;
557134a3 204#endif /* CONFIG_NFS_V4_1 */
71468513
BH		 205
206 nfs4_destroy_callback(clp);
557134a3
AA		 207}
208
24c8dbbb
DH		 209/*
210 * Destroy a shared client record
211 */
212static void nfs_free_client(struct nfs_client *clp)
213{
40c55319 214 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
24c8dbbb 215
557134a3 216 nfs4_clear_client_minor_version(clp);
5dd3177a 217 nfs4_shutdown_client(clp);
24c8dbbb 218
14727281
DH		 219 nfs_fscache_release_client_cookie(clp);
220
24c8dbbb
DH		 221 /* -EIO all pending I/O */
222 if (!IS_ERR(clp->cl_rpcclient))
223 rpc_shutdown_client(clp->cl_rpcclient);
224
7c67db3a
TM		 225 if (clp->cl_machine_cred != NULL)
226 put_rpccred(clp->cl_machine_cred);
227
24c8dbbb
DH		 228 kfree(clp->cl_hostname);
229 kfree(clp);
230
231 dprintk("<-- nfs_free_client()\n");
232}
233
234/*
235 * Release a reference to a shared client record
236 */
237void nfs_put_client(struct nfs_client *clp)
238{
27ba8512
DH		 239 if (!clp)
240 return;
241
24c8dbbb
DH		 242 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
243
244 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
245 list_del(&clp->cl_share_link);
246 spin_unlock(&nfs_client_lock);
247
248 BUG_ON(!list_empty(&clp->cl_superblocks));
249
250 nfs_free_client(clp);
251 }
252}
253
9082a5cc 254#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
9f4c899c
TM		 255/*
256 * Test if two ip6 socket addresses refer to the same socket by
257 * comparing relevant fields. The padding bytes specifically, are not
258 * compared. sin6_flowinfo is not compared because it only affects QoS
259 * and sin6_scope_id is only compared if the address is "link local"
260 * because "link local" addresses need only be unique to a specific
261 * link. Conversely, ordinary unicast addresses might have different
262 * sin6_scope_id.
263 *
264 * The caller should ensure both socket addresses are AF_INET6.
265 */
3c8c45df
CL		 266static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
267 const struct sockaddr *sa2)
9f4c899c 268{
3c8c45df
CL		 269 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
270 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
9f4c899c 271
3c8c45df
CL		 272 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
273 sin1->sin6_scope_id != sin2->sin6_scope_id)
9f4c899c 274 return 0;
3b0d3f93 275
3c8c45df 276 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
3b0d3f93 277}
3c8c45df
CL		 278#else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
279static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
280 const struct sockaddr *sa2)
9f4c899c
TM		 281{
282 return 0;
283}
9082a5cc 284#endif
3b0d3f93 285
d7371c41
ID		 286/*
287 * Test if two ip4 socket addresses refer to the same socket, by
288 * comparing relevant fields. The padding bytes specifically, are
289 * not compared.
290 *
291 * The caller should ensure both socket addresses are AF_INET.
292 */
3c8c45df
CL		 293static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
294 const struct sockaddr *sa2)
295{
296 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
297 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
298
299 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
300}
301
302static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
303 const struct sockaddr *sa2)
304{
305 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
306 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
307
308 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
309 (sin1->sin6_port == sin2->sin6_port);
310}
311
9f4c899c
TM		 312static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
313 const struct sockaddr *sa2)
d7371c41 314{
3c8c45df
CL		 315 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
316 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
9f4c899c 317
3c8c45df
CL		 318 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
319 (sin1->sin_port == sin2->sin_port);
320}
321
322/*
323 * Test if two socket addresses represent the same actual socket,
324 * by comparing (only) relevant fields, excluding the port number.
325 */
326static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
327 const struct sockaddr *sa2)
328{
329 if (sa1->sa_family != sa2->sa_family)
d7371c41 330 return 0;
3c8c45df
CL		 331
332 switch (sa1->sa_family) {
333 case AF_INET:
334 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
335 case AF_INET6:
336 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
337 }
338 return 0;
d7371c41
ID		 339}
340
d7371c41
ID		 341/*
342 * Test if two socket addresses represent the same actual socket,
3c8c45df 343 * by comparing (only) relevant fields, including the port number.
d7371c41
ID		 344 */
345static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
346 const struct sockaddr *sa2)
347{
348 if (sa1->sa_family != sa2->sa_family)
349 return 0;
350
351 switch (sa1->sa_family) {
352 case AF_INET:
9f4c899c 353 return nfs_sockaddr_cmp_ip4(sa1, sa2);
d7371c41 354 case AF_INET6:
9f4c899c 355 return nfs_sockaddr_cmp_ip6(sa1, sa2);
d7371c41
ID		 356 }
357 return 0;
358}
359
24c8dbbb 360/*
c81468a1
TM		 361 * Find a client by IP address and protocol version
362 * - returns NULL if no such client
24c8dbbb 363 */
ff052645 364struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
24c8dbbb
DH		 365{
366 struct nfs_client *clp;
367
c81468a1 368 spin_lock(&nfs_client_lock);
24c8dbbb 369 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
3b0d3f93
TM		 370 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
371
13bbc06a 372 /* Don't match clients that failed to initialise properly */
76db6d95
AA		 373 if (!(clp->cl_cons_state == NFS_CS_READY ||
374 clp->cl_cons_state == NFS_CS_SESSION_INITING))
13bbc06a
TM		 375 continue;
376
24c8dbbb 377 /* Different NFS versions cannot share the same nfs_client */
40c55319 378 if (clp->rpc_ops->version != nfsversion)
24c8dbbb
DH		 379 continue;
380
c81468a1 381 /* Match only the IP address, not the port number */
3b0d3f93 382 if (!nfs_sockaddr_match_ipaddr(addr, clap))
24c8dbbb
DH		 383 continue;
384
c81468a1
TM		 385 atomic_inc(&clp->cl_count);
386 spin_unlock(&nfs_client_lock);
387 return clp;
24c8dbbb 388 }
c81468a1 389 spin_unlock(&nfs_client_lock);
24c8dbbb 390 return NULL;
24c8dbbb
DH		 391}
392
3fbd67ad
TM		 393/*
394 * Find a client by IP address and protocol version
395 * - returns NULL if no such client
396 */
397struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
398{
399 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
400 u32 nfsvers = clp->rpc_ops->version;
401
402 spin_lock(&nfs_client_lock);
403 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
404 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
405
406 /* Don't match clients that failed to initialise properly */
407 if (clp->cl_cons_state != NFS_CS_READY)
408 continue;
409
410 /* Different NFS versions cannot share the same nfs_client */
411 if (clp->rpc_ops->version != nfsvers)
412 continue;
413
3fbd67ad
TM		 414 /* Match only the IP address, not the port number */
415 if (!nfs_sockaddr_match_ipaddr(sap, clap))
416 continue;
417
418 atomic_inc(&clp->cl_count);
419 spin_unlock(&nfs_client_lock);
420 return clp;
421 }
422 spin_unlock(&nfs_client_lock);
423 return NULL;
424}
425
24c8dbbb 426/*
c81468a1
TM		 427 * Find an nfs_client on the list that matches the initialisation data
428 * that is supplied.
24c8dbbb 429 */
c81468a1 430static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
24c8dbbb
DH		 431{
432 struct nfs_client *clp;
d7371c41 433 const struct sockaddr *sap = data->addr;
24c8dbbb 434
c81468a1 435 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
d7371c41 436 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
c81468a1
TM		 437 /* Don't match clients that failed to initialise properly */
438 if (clp->cl_cons_state < 0)
439 continue;
440
441 /* Different NFS versions cannot share the same nfs_client */
40c55319 442 if (clp->rpc_ops != data->rpc_ops)
c81468a1
TM		 443 continue;
444
59dca3b2
TM		 445 if (clp->cl_proto != data->proto)
446 continue;
5aae4a9a
BH		 447 /* Match nfsv4 minorversion */
448 if (clp->cl_minorversion != data->minorversion)
449 continue;
c81468a1 450 /* Match the full socket address */
d7371c41 451 if (!nfs_sockaddr_cmp(sap, clap))
c81468a1
TM		 452 continue;
453
454 atomic_inc(&clp->cl_count);
455 return clp;
13bbc06a 456 }
c81468a1 457 return NULL;
24c8dbbb
DH		 458}
459
460/*
461 * Look up a client by IP address and protocol version
462 * - creates a new record if one doesn't yet exist
463 */
3a498026 464static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
24c8dbbb
DH		 465{
466 struct nfs_client *clp, *new = NULL;
467 int error;
468
d7422c47
CL		 469 dprintk("--> nfs_get_client(%s,v%u)\n",
470 cl_init->hostname ?: "", cl_init->rpc_ops->version);
24c8dbbb
DH		 471
472 /* see if the client already exists */
473 do {
474 spin_lock(&nfs_client_lock);
475
c81468a1 476 clp = nfs_match_client(cl_init);
24c8dbbb
DH		 477 if (clp)
478 goto found_client;
479 if (new)
480 goto install_client;
481
482 spin_unlock(&nfs_client_lock);
483
3a498026 484 new = nfs_alloc_client(cl_init);
a21bdd9b 485 } while (!IS_ERR(new));
24c8dbbb 486
a21bdd9b
CL		 487 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
488 return new;
24c8dbbb
DH		 489
490 /* install a new client and return with it unready */
491install_client:
492 clp = new;
493 list_add(&clp->cl_share_link, &nfs_client_list);
494 spin_unlock(&nfs_client_lock);
495 dprintk("--> nfs_get_client() = %p [new]\n", clp);
496 return clp;
497
498 /* found an existing client
499 * - make sure it's ready before returning
500 */
501found_client:
502 spin_unlock(&nfs_client_lock);
503
504 if (new)
505 nfs_free_client(new);
506
150030b7 507 error = wait_event_killable(nfs_client_active_wq,
76db6d95 508 clp->cl_cons_state < NFS_CS_INITING);
0bae89ec
TM		 509 if (error < 0) {
510 nfs_put_client(clp);
511 return ERR_PTR(-ERESTARTSYS);
24c8dbbb
DH		 512 }
513
514 if (clp->cl_cons_state < NFS_CS_READY) {
515 error = clp->cl_cons_state;
516 nfs_put_client(clp);
517 return ERR_PTR(error);
518 }
519
54ceac45
DH		 520 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
521
24c8dbbb
DH		 522 dprintk("--> nfs_get_client() = %p [share]\n", clp);
523 return clp;
524}
525
526/*
527 * Mark a server as ready or failed
528 */
76db6d95 529void nfs_mark_client_ready(struct nfs_client *clp, int state)
24c8dbbb
DH		 530{
531 clp->cl_cons_state = state;
532 wake_up_all(&nfs_client_active_wq);
533}
5006a76c 534
008f55d0
BH		 535/*
536 * With sessions, the client is not marked ready until after a
537 * successful EXCHANGE_ID and CREATE_SESSION.
538 *
539 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
540 * other versions of NFS can be tried.
541 */
542int nfs4_check_client_ready(struct nfs_client *clp)
543{
544 if (!nfs4_has_session(clp))
545 return 0;
546 if (clp->cl_cons_state < NFS_CS_READY)
547 return -EPROTONOSUPPORT;
548 return 0;
549}
550
5006a76c
DH		 551/*
552 * Initialise the timeout values for a connection
553 */
554static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
555 unsigned int timeo, unsigned int retrans)
556{
557 to->to_initval = timeo * HZ / 10;
558 to->to_retries = retrans;
5006a76c
DH		 559
560 switch (proto) {
0896a725 561 case XPRT_TRANSPORT_TCP:
2cf7ff7a 562 case XPRT_TRANSPORT_RDMA:
259875ef
TM		 563 if (to->to_retries == 0)
564 to->to_retries = NFS_DEF_TCP_RETRANS;
7a3e3e18 565 if (to->to_initval == 0)
259875ef 566 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
5006a76c
DH		 567 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
568 to->to_initval = NFS_MAX_TCP_TIMEOUT;
569 to->to_increment = to->to_initval;
570 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
7a3e3e18
TM		 571 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
572 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
573 if (to->to_maxval < to->to_initval)
574 to->to_maxval = to->to_initval;
5006a76c
DH		 575 to->to_exponential = 0;
576 break;
0896a725 577 case XPRT_TRANSPORT_UDP:
259875ef
TM		 578 if (to->to_retries == 0)
579 to->to_retries = NFS_DEF_UDP_RETRANS;
5006a76c 580 if (!to->to_initval)
259875ef 581 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
5006a76c
DH		 582 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
583 to->to_initval = NFS_MAX_UDP_TIMEOUT;
584 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
585 to->to_exponential = 1;
586 break;
259875ef
TM		 587 default:
588 BUG();
5006a76c
DH		 589 }
590}
591
592/*
593 * Create an RPC client handle
594 */
59dca3b2 595static int nfs_create_rpc_client(struct nfs_client *clp,
33170233
TM		 596 const struct rpc_timeout *timeparms,
597 rpc_authflavor_t flavor,
4a01b8a4 598 int discrtry, int noresvport)
5006a76c 599{
5006a76c 600 struct rpc_clnt *clnt = NULL;
41877d20 601 struct rpc_create_args args = {
59dca3b2 602 .protocol = clp->cl_proto,
41877d20 603 .address = (struct sockaddr *)&clp->cl_addr,
6e4cffd7 604 .addrsize = clp->cl_addrlen,
33170233 605 .timeout = timeparms,
41877d20
CL		 606 .servername = clp->cl_hostname,
607 .program = &nfs_program,
608 .version = clp->rpc_ops->version,
609 .authflavor = flavor,
610 };
5006a76c 611
4a01b8a4
CL		 612 if (discrtry)
613 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
614 if (noresvport)
615 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
616
5006a76c
DH		 617 if (!IS_ERR(clp->cl_rpcclient))
618 return 0;
619
41877d20 620 clnt = rpc_create(&args);
5006a76c
DH		 621 if (IS_ERR(clnt)) {
622 dprintk("%s: cannot create RPC client. Error = %ld\n",
3110ff80 623 __func__, PTR_ERR(clnt));
5006a76c
DH		 624 return PTR_ERR(clnt);
625 }
626
5006a76c
DH		 627 clp->cl_rpcclient = clnt;
628 return 0;
629}
54ceac45
DH		 630
631/*
632 * Version 2 or 3 client destruction
633 */
634static void nfs_destroy_server(struct nfs_server *server)
635{
54ceac45 636 if (!(server->flags & NFS_MOUNT_NONLM))
9289e7f9 637 nlmclnt_done(server->nlm_host);
54ceac45
DH		 638}
639
640/*
641 * Version 2 or 3 lockd setup
642 */
643static int nfs_start_lockd(struct nfs_server *server)
644{
9289e7f9
CL		 645 struct nlm_host *host;
646 struct nfs_client *clp = server->nfs_client;
883bb163
CL		 647 struct nlmclnt_initdata nlm_init = {
648 .hostname = clp->cl_hostname,
649 .address = (struct sockaddr *)&clp->cl_addr,
650 .addrlen = clp->cl_addrlen,
651 .protocol = server->flags & NFS_MOUNT_TCP ?
652 IPPROTO_TCP : IPPROTO_UDP,
653 .nfs_version = clp->rpc_ops->version,
0cb2659b
CL		 654 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
655 1 : 0,
883bb163 656 };
54ceac45 657
883bb163 658 if (nlm_init.nfs_version > 3)
9289e7f9 659 return 0;
54ceac45 660 if (server->flags & NFS_MOUNT_NONLM)
9289e7f9
CL		 661 return 0;
662
883bb163 663 host = nlmclnt_init(&nlm_init);
9289e7f9
CL		 664 if (IS_ERR(host))
665 return PTR_ERR(host);
666
667 server->nlm_host = host;
668 server->destroy = nfs_destroy_server;
669 return 0;
54ceac45
DH		 670}
671
672/*
673 * Initialise an NFSv3 ACL client connection
674 */
675#ifdef CONFIG_NFS_V3_ACL
676static void nfs_init_server_aclclient(struct nfs_server *server)
677{
40c55319 678 if (server->nfs_client->rpc_ops->version != 3)
54ceac45
DH		 679 goto out_noacl;
680 if (server->flags & NFS_MOUNT_NOACL)
681 goto out_noacl;
682
683 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
684 if (IS_ERR(server->client_acl))
685 goto out_noacl;
686
687 /* No errors! Assume that Sun nfsacls are supported */
688 server->caps |= NFS_CAP_ACLS;
689 return;
690
691out_noacl:
692 server->caps &= ~NFS_CAP_ACLS;
693}
694#else
695static inline void nfs_init_server_aclclient(struct nfs_server *server)
696{
697 server->flags &= ~NFS_MOUNT_NOACL;
698 server->caps &= ~NFS_CAP_ACLS;
699}
700#endif
701
702/*
703 * Create a general RPC client
704 */
33170233
TM		 705static int nfs_init_server_rpcclient(struct nfs_server *server,
706 const struct rpc_timeout *timeo,
707 rpc_authflavor_t pseudoflavour)
54ceac45
DH		 708{
709 struct nfs_client *clp = server->nfs_client;
710
711 server->client = rpc_clone_client(clp->cl_rpcclient);
712 if (IS_ERR(server->client)) {
3110ff80 713 dprintk("%s: couldn't create rpc_client!\n", __func__);
54ceac45
DH		 714 return PTR_ERR(server->client);
715 }
716
33170233
TM		 717 memcpy(&server->client->cl_timeout_default,
718 timeo,
719 sizeof(server->client->cl_timeout_default));
720 server->client->cl_timeout = &server->client->cl_timeout_default;
721
54ceac45
DH		 722 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
723 struct rpc_auth *auth;
724
725 auth = rpcauth_create(pseudoflavour, server->client);
726 if (IS_ERR(auth)) {
3110ff80 727 dprintk("%s: couldn't create credcache!\n", __func__);
54ceac45
DH		 728 return PTR_ERR(auth);
729 }
730 }
731 server->client->cl_softrtry = 0;
732 if (server->flags & NFS_MOUNT_SOFT)
733 server->client->cl_softrtry = 1;
734
54ceac45
DH		 735 return 0;
736}
737
738/*
739 * Initialise an NFS2 or NFS3 client
740 */
2283f8d6 741static int nfs_init_client(struct nfs_client *clp,
33170233 742 const struct rpc_timeout *timeparms,
2283f8d6 743 const struct nfs_parsed_mount_data *data)
54ceac45 744{
54ceac45
DH		 745 int error;
746
747 if (clp->cl_cons_state == NFS_CS_READY) {
748 /* the client is already initialised */
749 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
750 return 0;
751 }
752
54ceac45
DH		 753 /*
754 * Create a client RPC handle for doing FSSTAT with UNIX auth only
755 * - RFC 2623, sec 2.3.2
756 */
d740351b
CL		 757 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
758 0, data->flags & NFS_MOUNT_NORESVPORT);
54ceac45
DH		 759 if (error < 0)
760 goto error;
761 nfs_mark_client_ready(clp, NFS_CS_READY);
762 return 0;
763
764error:
765 nfs_mark_client_ready(clp, error);
766 dprintk("<-- nfs_init_client() = xerror %d\n", error);
767 return error;
768}
769
770/*
771 * Create a version 2 or 3 client
772 */
2283f8d6
TT		 773static int nfs_init_server(struct nfs_server *server,
774 const struct nfs_parsed_mount_data *data)
54ceac45 775{
3a498026
TM		 776 struct nfs_client_initdata cl_init = {
777 .hostname = data->nfs_server.hostname,
d7422c47 778 .addr = (const struct sockaddr *)&data->nfs_server.address,
4c568017 779 .addrlen = data->nfs_server.addrlen,
40c55319 780 .rpc_ops = &nfs_v2_clientops,
59dca3b2 781 .proto = data->nfs_server.protocol,
3a498026 782 };
33170233 783 struct rpc_timeout timeparms;
54ceac45 784 struct nfs_client *clp;
3a498026 785 int error;
54ceac45
DH		 786
787 dprintk("--> nfs_init_server()\n");
788
789#ifdef CONFIG_NFS_V3
790 if (data->flags & NFS_MOUNT_VER3)
40c55319 791 cl_init.rpc_ops = &nfs_v3_clientops;
54ceac45
DH		 792#endif
793
794 /* Allocate or find a client reference we can use */
3a498026 795 clp = nfs_get_client(&cl_init);
54ceac45
DH		 796 if (IS_ERR(clp)) {
797 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
798 return PTR_ERR(clp);
799 }
800
33170233
TM		 801 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
802 data->timeo, data->retrans);
803 error = nfs_init_client(clp, &timeparms, data);
54ceac45
DH		 804 if (error < 0)
805 goto error;
806
807 server->nfs_client = clp;
808
809 /* Initialise the client representation from the mount data */
ff3525a5 810 server->flags = data->flags;
b797cac7 811 server->options = data->options;
62ab460c
TM		 812 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
813 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
814 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
54ceac45
DH		 815
816 if (data->rsize)
817 server->rsize = nfs_block_size(data->rsize, NULL);
818 if (data->wsize)
819 server->wsize = nfs_block_size(data->wsize, NULL);
820
821 server->acregmin = data->acregmin * HZ;
822 server->acregmax = data->acregmax * HZ;
823 server->acdirmin = data->acdirmin * HZ;
824 server->acdirmax = data->acdirmax * HZ;
825
826 /* Start lockd here, before we might error out */
827 error = nfs_start_lockd(server);
828 if (error < 0)
829 goto error;
830
f22d6d79
CL		 831 server->port = data->nfs_server.port;
832
33170233 833 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
54ceac45
DH		 834 if (error < 0)
835 goto error;
836
3f8400d1
CL		 837 /* Preserve the values of mount_server-related mount options */
838 if (data->mount_server.addrlen) {
839 memcpy(&server->mountd_address, &data->mount_server.address,
840 data->mount_server.addrlen);
841 server->mountd_addrlen = data->mount_server.addrlen;
842 }
843 server->mountd_version = data->mount_server.version;
844 server->mountd_port = data->mount_server.port;
845 server->mountd_protocol = data->mount_server.protocol;
846
54ceac45
DH		 847 server->namelen = data->namlen;
848 /* Create a client RPC handle for the NFSv3 ACL management interface */
849 nfs_init_server_aclclient(server);
54ceac45
DH		 850 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
851 return 0;
852
853error:
854 server->nfs_client = NULL;
855 nfs_put_client(clp);
856 dprintk("<-- nfs_init_server() = xerror %d\n", error);
857 return error;
858}
859
860/*
861 * Load up the server record from information gained in an fsinfo record
862 */
863static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
864{
865 unsigned long max_rpc_payload;
866
867 /* Work out a lot of parameters */
868 if (server->rsize == 0)
869 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
870 if (server->wsize == 0)
871 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
872
873 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
874 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
875 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
876 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
877
878 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
879 if (server->rsize > max_rpc_payload)
880 server->rsize = max_rpc_payload;
881 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
882 server->rsize = NFS_MAX_FILE_IO_SIZE;
883 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
e0bf68dd 884
d993831f 885 server->backing_dev_info.name = "nfs";
54ceac45
DH		 886 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
887
888 if (server->wsize > max_rpc_payload)
889 server->wsize = max_rpc_payload;
890 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
891 server->wsize = NFS_MAX_FILE_IO_SIZE;
892 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
893 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
894
895 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
896 if (server->dtsize > PAGE_CACHE_SIZE)
897 server->dtsize = PAGE_CACHE_SIZE;
898 if (server->dtsize > server->rsize)
899 server->dtsize = server->rsize;
900
901 if (server->flags & NFS_MOUNT_NOAC) {
902 server->acregmin = server->acregmax = 0;
903 server->acdirmin = server->acdirmax = 0;
904 }
905
906 server->maxfilesize = fsinfo->maxfilesize;
907
908 /* We're airborne Set socket buffersize */
909 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
910}
911
912/*
913 * Probe filesystem information, including the FSID on v2/v3
914 */
915static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
916{
917 struct nfs_fsinfo fsinfo;
918 struct nfs_client *clp = server->nfs_client;
919 int error;
920
921 dprintk("--> nfs_probe_fsinfo()\n");
922
923 if (clp->rpc_ops->set_capabilities != NULL) {
924 error = clp->rpc_ops->set_capabilities(server, mntfh);
925 if (error < 0)
926 goto out_error;
927 }
928
929 fsinfo.fattr = fattr;
930 nfs_fattr_init(fattr);
931 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
932 if (error < 0)
933 goto out_error;
934
935 nfs_server_set_fsinfo(server, &fsinfo);
936
937 /* Get some general file system info */
938 if (server->namelen == 0) {
939 struct nfs_pathconf pathinfo;
940
941 pathinfo.fattr = fattr;
942 nfs_fattr_init(fattr);
943
944 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
945 server->namelen = pathinfo.max_namelen;
946 }
947
948 dprintk("<-- nfs_probe_fsinfo() = 0\n");
949 return 0;
950
951out_error:
952 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
953 return error;
954}
955
956/*
957 * Copy useful information when duplicating a server record
958 */
959static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
960{
961 target->flags = source->flags;
962 target->acregmin = source->acregmin;
963 target->acregmax = source->acregmax;
964 target->acdirmin = source->acdirmin;
965 target->acdirmax = source->acdirmax;
966 target->caps = source->caps;
967}
968
969/*
970 * Allocate and initialise a server record
971 */
972static struct nfs_server *nfs_alloc_server(void)
973{
974 struct nfs_server *server;
975
976 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
977 if (!server)
978 return NULL;
979
980 server->client = server->client_acl = ERR_PTR(-EINVAL);
981
982 /* Zero out the NFS state stuff */
983 INIT_LIST_HEAD(&server->client_link);
984 INIT_LIST_HEAD(&server->master_link);
985
ef818a28
SD		 986 atomic_set(&server->active, 0);
987
54ceac45
DH		 988 server->io_stats = nfs_alloc_iostats();
989 if (!server->io_stats) {
990 kfree(server);
991 return NULL;
992 }
993
48d07649
JA		 994 if (bdi_init(&server->backing_dev_info)) {
995 nfs_free_iostats(server->io_stats);
996 kfree(server);
997 return NULL;
998 }
999
54ceac45
DH		 1000 return server;
1001}
1002
1003/*
1004 * Free up a server record
1005 */
1006void nfs_free_server(struct nfs_server *server)
1007{
1008 dprintk("--> nfs_free_server()\n");
1009
1010 spin_lock(&nfs_client_lock);
1011 list_del(&server->client_link);
1012 list_del(&server->master_link);
1013 spin_unlock(&nfs_client_lock);
1014
1015 if (server->destroy != NULL)
1016 server->destroy(server);
5cef338b
TM		 1017
1018 if (!IS_ERR(server->client_acl))
1019 rpc_shutdown_client(server->client_acl);
54ceac45
DH		 1020 if (!IS_ERR(server->client))
1021 rpc_shutdown_client(server->client);
1022
1023 nfs_put_client(server->nfs_client);
1024
1025 nfs_free_iostats(server->io_stats);
e0bf68dd 1026 bdi_destroy(&server->backing_dev_info);
54ceac45
DH		 1027 kfree(server);
1028 nfs_release_automount_timer();
1029 dprintk("<-- nfs_free_server()\n");
1030}
1031
1032/*
1033 * Create a version 2 or 3 volume record
1034 * - keyed on server and FSID
1035 */
2283f8d6 1036struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
54ceac45
DH		 1037 struct nfs_fh *mntfh)
1038{
1039 struct nfs_server *server;
1040 struct nfs_fattr fattr;
1041 int error;
1042
1043 server = nfs_alloc_server();
1044 if (!server)
1045 return ERR_PTR(-ENOMEM);
1046
1047 /* Get a client representation */
1048 error = nfs_init_server(server, data);
1049 if (error < 0)
1050 goto error;
1051
1052 BUG_ON(!server->nfs_client);
1053 BUG_ON(!server->nfs_client->rpc_ops);
1054 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1055
1056 /* Probe the root fh to retrieve its FSID */
1057 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1058 if (error < 0)
1059 goto error;
54af3bb5
TM		 1060 if (server->nfs_client->rpc_ops->version == 3) {
1061 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1062 server->namelen = NFS3_MAXNAMLEN;
1063 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1064 server->caps |= NFS_CAP_READDIRPLUS;
1065 } else {
1066 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1067 server->namelen = NFS2_MAXNAMLEN;
1068 }
1069
54ceac45
DH		 1070 if (!(fattr.valid & NFS_ATTR_FATTR)) {
1071 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
1072 if (error < 0) {
1073 dprintk("nfs_create_server: getattr error = %d\n", -error);
1074 goto error;
1075 }
1076 }
1077 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
1078
6daabf1b
DH		 1079 dprintk("Server FSID: %llx:%llx\n",
1080 (unsigned long long) server->fsid.major,
1081 (unsigned long long) server->fsid.minor);
54ceac45 1082
54ceac45
DH		 1083 spin_lock(&nfs_client_lock);
1084 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1085 list_add_tail(&server->master_link, &nfs_volume_list);
1086 spin_unlock(&nfs_client_lock);
1087
1088 server->mount_time = jiffies;
1089 return server;
1090
1091error:
1092 nfs_free_server(server);
1093 return ERR_PTR(error);
1094}
1095
1096#ifdef CONFIG_NFS_V4
9bdaa86d
BH		 1097/*
1098 * Initialize the NFS4 callback service
1099 */
1100static int nfs4_init_callback(struct nfs_client *clp)
1101{
1102 int error;
1103
1104 if (clp->rpc_ops->version == 4) {
0b5b7ae0
AA		 1105 if (nfs4_has_session(clp)) {
1106 error = xprt_setup_backchannel(
1107 clp->cl_rpcclient->cl_xprt,
1108 NFS41_BC_MIN_CALLBACKS);
1109 if (error < 0)
1110 return error;
1111 }
1112
71468513
BH		 1113 error = nfs_callback_up(clp->cl_minorversion,
1114 clp->cl_rpcclient->cl_xprt);
9bdaa86d
BH		 1115 if (error < 0) {
1116 dprintk("%s: failed to start callback. Error = %d\n",
1117 __func__, error);
1118 return error;
1119 }
1120 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1121 }
1122 return 0;
1123}
1124
557134a3
AA		 1125/*
1126 * Initialize the minor version specific parts of an NFS4 client record
1127 */
1128static int nfs4_init_client_minor_version(struct nfs_client *clp)
1129{
cccef3b9
AA		 1130 clp->cl_call_sync = _nfs4_call_sync;
1131
557134a3
AA		 1132#if defined(CONFIG_NFS_V4_1)
1133 if (clp->cl_minorversion) {
1134 struct nfs4_session *session = NULL;
1135 /*
1136 * Create the session and mark it expired.
1137 * When a SEQUENCE operation encounters the expired session
1138 * it will do session recovery to initialize it.
1139 */
1140 session = nfs4_alloc_session(clp);
1141 if (!session)
1142 return -ENOMEM;
1143
1144 clp->cl_session = session;
cccef3b9 1145 clp->cl_call_sync = _nfs4_call_sync_session;
557134a3
AA		 1146 }
1147#endif /* CONFIG_NFS_V4_1 */
1148
71468513 1149 return nfs4_init_callback(clp);
557134a3
AA		 1150}
1151
54ceac45
DH		 1152/*
1153 * Initialise an NFS4 client record
1154 */
1155static int nfs4_init_client(struct nfs_client *clp,
33170233 1156 const struct rpc_timeout *timeparms,
7d9ac06f 1157 const char *ip_addr,
d740351b
CL		 1158 rpc_authflavor_t authflavour,
1159 int flags)
54ceac45
DH		 1160{
1161 int error;
1162
1163 if (clp->cl_cons_state == NFS_CS_READY) {
1164 /* the client is initialised already */
1165 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1166 return 0;
1167 }
1168
1169 /* Check NFS protocol revision and initialize RPC op vector */
1170 clp->rpc_ops = &nfs_v4_clientops;
1171
59dca3b2 1172 error = nfs_create_rpc_client(clp, timeparms, authflavour,
d740351b 1173 1, flags & NFS_MOUNT_NORESVPORT);
54ceac45
DH		 1174 if (error < 0)
1175 goto error;
7d9ac06f 1176 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
54ceac45
DH		 1177
1178 error = nfs_idmap_new(clp);
1179 if (error < 0) {
1180 dprintk("%s: failed to create idmapper. Error = %d\n",
3110ff80 1181 __func__, error);
54ceac45
DH		 1182 goto error;
1183 }
9c5bf38d 1184 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
54ceac45 1185
557134a3
AA		 1186 error = nfs4_init_client_minor_version(clp);
1187 if (error < 0)
1188 goto error;
1189
76db6d95
AA		 1190 if (!nfs4_has_session(clp))
1191 nfs_mark_client_ready(clp, NFS_CS_READY);
54ceac45
DH		 1192 return 0;
1193
1194error:
1195 nfs_mark_client_ready(clp, error);
1196 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1197 return error;
1198}
1199
1200/*
1201 * Set up an NFS4 client
1202 */
1203static int nfs4_set_client(struct nfs_server *server,
dcecae0f
CL		 1204 const char *hostname,
1205 const struct sockaddr *addr,
1206 const size_t addrlen,
7d9ac06f 1207 const char *ip_addr,
54ceac45 1208 rpc_authflavor_t authflavour,
94a417f3
BH		 1209 int proto, const struct rpc_timeout *timeparms,
1210 u32 minorversion)
54ceac45 1211{
3a498026
TM		 1212 struct nfs_client_initdata cl_init = {
1213 .hostname = hostname,
dcecae0f
CL		 1214 .addr = addr,
1215 .addrlen = addrlen,
40c55319 1216 .rpc_ops = &nfs_v4_clientops,
59dca3b2 1217 .proto = proto,
5aae4a9a 1218 .minorversion = minorversion,
3a498026 1219 };
54ceac45
DH		 1220 struct nfs_client *clp;
1221 int error;
1222
1223 dprintk("--> nfs4_set_client()\n");
1224
1225 /* Allocate or find a client reference we can use */
3a498026 1226 clp = nfs_get_client(&cl_init);
54ceac45
DH		 1227 if (IS_ERR(clp)) {
1228 error = PTR_ERR(clp);
1229 goto error;
1230 }
d740351b
CL		 1231 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour,
1232 server->flags);
54ceac45
DH		 1233 if (error < 0)
1234 goto error_put;
1235
1236 server->nfs_client = clp;
1237 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1238 return 0;
1239
1240error_put:
1241 nfs_put_client(clp);
1242error:
1243 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1244 return error;
1245}
1246
557134a3 1247
96b09e02
AA		 1248/*
1249 * Session has been established, and the client marked ready.
1250 * Set the mount rsize and wsize with negotiated fore channel
1251 * attributes which will be bound checked in nfs_server_set_fsinfo.
1252 */
1253static void nfs4_session_set_rwsize(struct nfs_server *server)
1254{
1255#ifdef CONFIG_NFS_V4_1
1256 if (!nfs4_has_session(server->nfs_client))
1257 return;
1258 server->rsize = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
1259 server->wsize = server->nfs_client->cl_session->fc_attrs.max_rqst_sz;
1260#endif /* CONFIG_NFS_V4_1 */
1261}
1262
54ceac45
DH		 1263/*
1264 * Create a version 4 volume record
1265 */
1266static int nfs4_init_server(struct nfs_server *server,
91ea40b9 1267 const struct nfs_parsed_mount_data *data)
54ceac45 1268{
33170233 1269 struct rpc_timeout timeparms;
54ceac45
DH		 1270 int error;
1271
1272 dprintk("--> nfs4_init_server()\n");
1273
33170233
TM		 1274 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1275 data->timeo, data->retrans);
1276
542fcc33
CL		 1277 /* Initialise the client representation from the mount data */
1278 server->flags = data->flags;
62ab460c 1279 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
b797cac7 1280 server->options = data->options;
542fcc33 1281
33170233
TM		 1282 /* Get a client record */
1283 error = nfs4_set_client(server,
1284 data->nfs_server.hostname,
1285 (const struct sockaddr *)&data->nfs_server.address,
1286 data->nfs_server.addrlen,
1287 data->client_address,
1288 data->auth_flavors[0],
1289 data->nfs_server.protocol,
94a417f3
BH		 1290 &timeparms,
1291 data->minorversion);
33170233
TM		 1292 if (error < 0)
1293 goto error;
1294
54ceac45
DH		 1295 if (data->rsize)
1296 server->rsize = nfs_block_size(data->rsize, NULL);
1297 if (data->wsize)
1298 server->wsize = nfs_block_size(data->wsize, NULL);
1299
1300 server->acregmin = data->acregmin * HZ;
1301 server->acregmax = data->acregmax * HZ;
1302 server->acdirmin = data->acdirmin * HZ;
1303 server->acdirmax = data->acdirmax * HZ;
1304
f22d6d79
CL		 1305 server->port = data->nfs_server.port;
1306
33170233 1307 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
54ceac45 1308
33170233 1309error:
54ceac45
DH		 1310 /* Done */
1311 dprintk("<-- nfs4_init_server() = %d\n", error);
1312 return error;
1313}
1314
1315/*
1316 * Create a version 4 volume record
1317 * - keyed on server and FSID
1318 */
91ea40b9 1319struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
54ceac45
DH		 1320 struct nfs_fh *mntfh)
1321{
1322 struct nfs_fattr fattr;
1323 struct nfs_server *server;
1324 int error;
1325
1326 dprintk("--> nfs4_create_server()\n");
1327
1328 server = nfs_alloc_server();
1329 if (!server)
1330 return ERR_PTR(-ENOMEM);
1331
54ceac45 1332 /* set up the general RPC client */
91ea40b9 1333 error = nfs4_init_server(server, data);
54ceac45
DH		 1334 if (error < 0)
1335 goto error;
1336
1337 BUG_ON(!server->nfs_client);
1338 BUG_ON(!server->nfs_client->rpc_ops);
1339 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1340
fccba804
TM		 1341 error = nfs4_init_session(server);
1342 if (error < 0)
1343 goto error;
557134a3 1344
54ceac45 1345 /* Probe the root fh to retrieve its FSID */
91ea40b9 1346 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
54ceac45
DH		 1347 if (error < 0)
1348 goto error;
1349
6daabf1b
DH		 1350 dprintk("Server FSID: %llx:%llx\n",
1351 (unsigned long long) server->fsid.major,
1352 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1353 dprintk("Mount FH: %d\n", mntfh->size);
1354
96b09e02
AA		 1355 nfs4_session_set_rwsize(server);
1356
54ceac45
DH		 1357 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1358 if (error < 0)
1359 goto error;
1360
54af3bb5
TM		 1361 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1362 server->namelen = NFS4_MAXNAMLEN;
1363
54ceac45
DH		 1364 spin_lock(&nfs_client_lock);
1365 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1366 list_add_tail(&server->master_link, &nfs_volume_list);
1367 spin_unlock(&nfs_client_lock);
1368
1369 server->mount_time = jiffies;
1370 dprintk("<-- nfs4_create_server() = %p\n", server);
1371 return server;
1372
1373error:
1374 nfs_free_server(server);
1375 dprintk("<-- nfs4_create_server() = error %d\n", error);
1376 return ERR_PTR(error);
1377}
1378
1379/*
1380 * Create an NFS4 referral server record
1381 */
1382struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
f2d0d85e 1383 struct nfs_fh *mntfh)
54ceac45
DH		 1384{
1385 struct nfs_client *parent_client;
1386 struct nfs_server *server, *parent_server;
1387 struct nfs_fattr fattr;
1388 int error;
1389
1390 dprintk("--> nfs4_create_referral_server()\n");
1391
1392 server = nfs_alloc_server();
1393 if (!server)
1394 return ERR_PTR(-ENOMEM);
1395
1396 parent_server = NFS_SB(data->sb);
1397 parent_client = parent_server->nfs_client;
1398
542fcc33
CL		 1399 /* Initialise the client representation from the parent server */
1400 nfs_server_copy_userdata(server, parent_server);
62ab460c 1401 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
542fcc33 1402
54ceac45
DH		 1403 /* Get a client representation.
1404 * Note: NFSv4 always uses TCP, */
dcecae0f 1405 error = nfs4_set_client(server, data->hostname,
6677d095
CL		 1406 data->addr,
1407 data->addrlen,
dcecae0f
CL		 1408 parent_client->cl_ipaddr,
1409 data->authflavor,
1410 parent_server->client->cl_xprt->prot,
94a417f3
BH		 1411 parent_server->client->cl_timeout,
1412 parent_client->cl_minorversion);
297de4f6 1413 if (error < 0)
1414 goto error;
54ceac45 1415
33170233 1416 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
54ceac45
DH		 1417 if (error < 0)
1418 goto error;
1419
1420 BUG_ON(!server->nfs_client);
1421 BUG_ON(!server->nfs_client->rpc_ops);
1422 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1423
f2d0d85e
TM		 1424 /* Probe the root fh to retrieve its FSID and filehandle */
1425 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1426 if (error < 0)
1427 goto error;
1428
54ceac45 1429 /* probe the filesystem info for this server filesystem */
f2d0d85e 1430 error = nfs_probe_fsinfo(server, mntfh, &fattr);
54ceac45
DH		 1431 if (error < 0)
1432 goto error;
1433
54af3bb5
TM		 1434 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1435 server->namelen = NFS4_MAXNAMLEN;
1436
54ceac45 1437 dprintk("Referral FSID: %llx:%llx\n",
6daabf1b
DH		 1438 (unsigned long long) server->fsid.major,
1439 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1440
1441 spin_lock(&nfs_client_lock);
1442 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1443 list_add_tail(&server->master_link, &nfs_volume_list);
1444 spin_unlock(&nfs_client_lock);
1445
1446 server->mount_time = jiffies;
1447
1448 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1449 return server;
1450
1451error:
1452 nfs_free_server(server);
1453 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1454 return ERR_PTR(error);
1455}
1456
1457#endif /* CONFIG_NFS_V4 */
1458
1459/*
1460 * Clone an NFS2, NFS3 or NFS4 server record
1461 */
1462struct nfs_server *nfs_clone_server(struct nfs_server *source,
1463 struct nfs_fh *fh,
1464 struct nfs_fattr *fattr)
1465{
1466 struct nfs_server *server;
1467 struct nfs_fattr fattr_fsinfo;
1468 int error;
1469
1470 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
6daabf1b
DH		 1471 (unsigned long long) fattr->fsid.major,
1472 (unsigned long long) fattr->fsid.minor);
54ceac45
DH		 1473
1474 server = nfs_alloc_server();
1475 if (!server)
1476 return ERR_PTR(-ENOMEM);
1477
1478 /* Copy data from the source */
1479 server->nfs_client = source->nfs_client;
1480 atomic_inc(&server->nfs_client->cl_count);
1481 nfs_server_copy_userdata(server, source);
1482
1483 server->fsid = fattr->fsid;
1484
33170233
TM		 1485 error = nfs_init_server_rpcclient(server,
1486 source->client->cl_timeout,
1487 source->client->cl_auth->au_flavor);
54ceac45
DH		 1488 if (error < 0)
1489 goto out_free_server;
1490 if (!IS_ERR(source->client_acl))
1491 nfs_init_server_aclclient(server);
1492
1493 /* probe the filesystem info for this server filesystem */
1494 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1495 if (error < 0)
1496 goto out_free_server;
1497
54af3bb5
TM		 1498 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1499 server->namelen = NFS4_MAXNAMLEN;
1500
54ceac45 1501 dprintk("Cloned FSID: %llx:%llx\n",
6daabf1b
DH		 1502 (unsigned long long) server->fsid.major,
1503 (unsigned long long) server->fsid.minor);
54ceac45
DH		 1504
1505 error = nfs_start_lockd(server);
1506 if (error < 0)
1507 goto out_free_server;
1508
1509 spin_lock(&nfs_client_lock);
1510 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1511 list_add_tail(&server->master_link, &nfs_volume_list);
1512 spin_unlock(&nfs_client_lock);
1513
1514 server->mount_time = jiffies;
1515
1516 dprintk("<-- nfs_clone_server() = %p\n", server);
1517 return server;
1518
1519out_free_server:
1520 nfs_free_server(server);
1521 dprintk("<-- nfs_clone_server() = error %d\n", error);
1522 return ERR_PTR(error);
1523}
6aaca566
DH		 1524
1525#ifdef CONFIG_PROC_FS
1526static struct proc_dir_entry *proc_fs_nfs;
1527
1528static int nfs_server_list_open(struct inode *inode, struct file *file);
1529static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1530static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1531static void nfs_server_list_stop(struct seq_file *p, void *v);
1532static int nfs_server_list_show(struct seq_file *m, void *v);
1533
88e9d34c 1534static const struct seq_operations nfs_server_list_ops = {
6aaca566
DH		 1535 .start = nfs_server_list_start,
1536 .next = nfs_server_list_next,
1537 .stop = nfs_server_list_stop,
1538 .show = nfs_server_list_show,
1539};
1540
00977a59 1541static const struct file_operations nfs_server_list_fops = {
6aaca566
DH		 1542 .open = nfs_server_list_open,
1543 .read = seq_read,
1544 .llseek = seq_lseek,
1545 .release = seq_release,
34b37235 1546 .owner = THIS_MODULE,
6aaca566
DH		 1547};
1548
1549static int nfs_volume_list_open(struct inode *inode, struct file *file);
1550static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1551static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1552static void nfs_volume_list_stop(struct seq_file *p, void *v);
1553static int nfs_volume_list_show(struct seq_file *m, void *v);
1554
88e9d34c 1555static const struct seq_operations nfs_volume_list_ops = {
6aaca566
DH		 1556 .start = nfs_volume_list_start,
1557 .next = nfs_volume_list_next,
1558 .stop = nfs_volume_list_stop,
1559 .show = nfs_volume_list_show,
1560};
1561
00977a59 1562static const struct file_operations nfs_volume_list_fops = {
6aaca566
DH		 1563 .open = nfs_volume_list_open,
1564 .read = seq_read,
1565 .llseek = seq_lseek,
1566 .release = seq_release,
34b37235 1567 .owner = THIS_MODULE,
6aaca566
DH		 1568};
1569
1570/*
1571 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1572 * we're dealing
1573 */
1574static int nfs_server_list_open(struct inode *inode, struct file *file)
1575{
1576 struct seq_file *m;
1577 int ret;
1578
1579 ret = seq_open(file, &nfs_server_list_ops);
1580 if (ret < 0)
1581 return ret;
1582
1583 m = file->private_data;
1584 m->private = PDE(inode)->data;
1585
1586 return 0;
1587}
1588
1589/*
1590 * set up the iterator to start reading from the server list and return the first item
1591 */
1592static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1593{
6aaca566
DH		 1594 /* lock the list against modification */
1595 spin_lock(&nfs_client_lock);
259902ea 1596 return seq_list_start_head(&nfs_client_list, *_pos);
6aaca566
DH		 1597}
1598
1599/*
1600 * move to next server
1601 */
1602static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1603{
259902ea 1604 return seq_list_next(v, &nfs_client_list, pos);
6aaca566
DH		 1605}
1606
1607/*
1608 * clean up after reading from the transports list
1609 */
1610static void nfs_server_list_stop(struct seq_file *p, void *v)
1611{
1612 spin_unlock(&nfs_client_lock);
1613}
1614
1615/*
1616 * display a header line followed by a load of call lines
1617 */
1618static int nfs_server_list_show(struct seq_file *m, void *v)
1619{
1620 struct nfs_client *clp;
1621
1622 /* display header on line 1 */
259902ea 1623 if (v == &nfs_client_list) {
6aaca566
DH		 1624 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1625 return 0;
1626 }
1627
1628 /* display one transport per line on subsequent lines */
1629 clp = list_entry(v, struct nfs_client, cl_share_link);
1630
5d8515ca 1631 seq_printf(m, "v%u %s %s %3d %s\n",
40c55319 1632 clp->rpc_ops->version,
5d8515ca
CL		 1633 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1634 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
6aaca566
DH		 1635 atomic_read(&clp->cl_count),
1636 clp->cl_hostname);
1637
1638 return 0;
1639}
1640
1641/*
1642 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1643 */
1644static int nfs_volume_list_open(struct inode *inode, struct file *file)
1645{
1646 struct seq_file *m;
1647 int ret;
1648
1649 ret = seq_open(file, &nfs_volume_list_ops);
1650 if (ret < 0)
1651 return ret;
1652
1653 m = file->private_data;
1654 m->private = PDE(inode)->data;
1655
1656 return 0;
1657}
1658
1659/*
1660 * set up the iterator to start reading from the volume list and return the first item
1661 */
1662static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1663{
6aaca566
DH		 1664 /* lock the list against modification */
1665 spin_lock(&nfs_client_lock);
259902ea 1666 return seq_list_start_head(&nfs_volume_list, *_pos);
6aaca566
DH		 1667}
1668
1669/*
1670 * move to next volume
1671 */
1672static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1673{
259902ea 1674 return seq_list_next(v, &nfs_volume_list, pos);
6aaca566
DH		 1675}
1676
1677/*
1678 * clean up after reading from the transports list
1679 */
1680static void nfs_volume_list_stop(struct seq_file *p, void *v)
1681{
1682 spin_unlock(&nfs_client_lock);
1683}
1684
1685/*
1686 * display a header line followed by a load of call lines
1687 */
1688static int nfs_volume_list_show(struct seq_file *m, void *v)
1689{
1690 struct nfs_server *server;
1691 struct nfs_client *clp;
1692 char dev[8], fsid[17];
1693
1694 /* display header on line 1 */
259902ea 1695 if (v == &nfs_volume_list) {
5d1acff1 1696 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
6aaca566
DH		 1697 return 0;
1698 }
1699 /* display one transport per line on subsequent lines */
1700 server = list_entry(v, struct nfs_server, master_link);
1701 clp = server->nfs_client;
1702
1703 snprintf(dev, 8, "%u:%u",
1704 MAJOR(server->s_dev), MINOR(server->s_dev));
1705
1706 snprintf(fsid, 17, "%llx:%llx",
6daabf1b
DH		 1707 (unsigned long long) server->fsid.major,
1708 (unsigned long long) server->fsid.minor);
6aaca566 1709
5d1acff1 1710 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
40c55319 1711 clp->rpc_ops->version,
5d8515ca
CL		 1712 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1713 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
6aaca566 1714 dev,
5d1acff1
DH		 1715 fsid,
1716 nfs_server_fscache_state(server));
6aaca566
DH		 1717
1718 return 0;
1719}
1720
1721/*
1722 * initialise the /proc/fs/nfsfs/ directory
1723 */
1724int __init nfs_fs_proc_init(void)
1725{
1726 struct proc_dir_entry *p;
1727
36a5aeb8 1728 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
6aaca566
DH		 1729 if (!proc_fs_nfs)
1730 goto error_0;
1731
6aaca566 1732 /* a file of servers with which we're dealing */
34b37235
DL		 1733 p = proc_create("servers", S_IFREG|S_IRUGO,
1734 proc_fs_nfs, &nfs_server_list_fops);
6aaca566
DH		 1735 if (!p)
1736 goto error_1;
1737
6aaca566 1738 /* a file of volumes that we have mounted */
34b37235
DL		 1739 p = proc_create("volumes", S_IFREG|S_IRUGO,
1740 proc_fs_nfs, &nfs_volume_list_fops);
6aaca566
DH		 1741 if (!p)
1742 goto error_2;
6aaca566
DH		 1743 return 0;
1744
1745error_2:
1746 remove_proc_entry("servers", proc_fs_nfs);
1747error_1:
36a5aeb8 1748 remove_proc_entry("fs/nfsfs", NULL);
6aaca566
DH		 1749error_0:
1750 return -ENOMEM;
1751}
1752
1753/*
1754 * clean up the /proc/fs/nfsfs/ directory
1755 */
1756void nfs_fs_proc_exit(void)
1757{
1758 remove_proc_entry("volumes", proc_fs_nfs);
1759 remove_proc_entry("servers", proc_fs_nfs);
36a5aeb8 1760 remove_proc_entry("fs/nfsfs", NULL);
6aaca566
DH		 1761}
1762
1763#endif /* CONFIG_PROC_FS */
Linux 6.x block layer and io_uring tree(s)