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1/* client.c: NFS client sharing and management code
2 *
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/sched.h>
16#include <linux/time.h>
17#include <linux/kernel.h>
18#include <linux/mm.h>
19#include <linux/string.h>
20#include <linux/stat.h>
21#include <linux/errno.h>
22#include <linux/unistd.h>
23#include <linux/sunrpc/clnt.h>
24#include <linux/sunrpc/stats.h>
25#include <linux/sunrpc/metrics.h>
26#include <linux/sunrpc/xprtsock.h>
27#include <linux/sunrpc/xprtrdma.h>
28#include <linux/nfs_fs.h>
29#include <linux/nfs_mount.h>
30#include <linux/nfs4_mount.h>
31#include <linux/lockd/bind.h>
32#include <linux/seq_file.h>
33#include <linux/mount.h>
34#include <linux/nfs_idmap.h>
35#include <linux/vfs.h>
36#include <linux/inet.h>
37#include <linux/in6.h>
38#include <linux/slab.h>
39#include <net/ipv6.h>
40#include <linux/nfs_xdr.h>
41#include <linux/sunrpc/bc_xprt.h>
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"
50#include "fscache.h"
51#include "pnfs.h"
52
53#define NFSDBG_FACILITY NFSDBG_CLIENT
54
55static DEFINE_SPINLOCK(nfs_client_lock);
56static LIST_HEAD(nfs_client_list);
57static LIST_HEAD(nfs_volume_list);
58static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
59#ifdef CONFIG_NFS_V4
60static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */
61
62/*
63 * Get a unique NFSv4.0 callback identifier which will be used
64 * by the V4.0 callback service to lookup the nfs_client struct
65 */
66static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
67{
68 int ret = 0;
69
70 if (clp->rpc_ops->version != 4 || minorversion != 0)
71 return ret;
72retry:
73 if (!idr_pre_get(&cb_ident_idr, GFP_KERNEL))
74 return -ENOMEM;
75 spin_lock(&nfs_client_lock);
76 ret = idr_get_new(&cb_ident_idr, clp, &clp->cl_cb_ident);
77 spin_unlock(&nfs_client_lock);
78 if (ret == -EAGAIN)
79 goto retry;
80 return ret;
81}
82#endif /* CONFIG_NFS_V4 */
83
84/*
85 * Turn off NFSv4 uid/gid mapping when using AUTH_SYS
86 */
87static int nfs4_disable_idmapping = 0;
88
89/*
90 * RPC cruft for NFS
91 */
92static struct rpc_version *nfs_version[5] = {
93 [2] = &nfs_version2,
94#ifdef CONFIG_NFS_V3
95 [3] = &nfs_version3,
96#endif
97#ifdef CONFIG_NFS_V4
98 [4] = &nfs_version4,
99#endif
100};
101
102struct rpc_program nfs_program = {
103 .name = "nfs",
104 .number = NFS_PROGRAM,
105 .nrvers = ARRAY_SIZE(nfs_version),
106 .version = nfs_version,
107 .stats = &nfs_rpcstat,
108 .pipe_dir_name = NFS_PIPE_DIRNAME,
109};
110
111struct rpc_stat nfs_rpcstat = {
112 .program = &nfs_program
113};
114
115
116#ifdef CONFIG_NFS_V3_ACL
117static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
118static struct rpc_version * nfsacl_version[] = {
119 [3] = &nfsacl_version3,
120};
121
122struct rpc_program nfsacl_program = {
123 .name = "nfsacl",
124 .number = NFS_ACL_PROGRAM,
125 .nrvers = ARRAY_SIZE(nfsacl_version),
126 .version = nfsacl_version,
127 .stats = &nfsacl_rpcstat,
128};
129#endif /* CONFIG_NFS_V3_ACL */
130
131struct nfs_client_initdata {
132 const char *hostname;
133 const struct sockaddr *addr;
134 size_t addrlen;
135 const struct nfs_rpc_ops *rpc_ops;
136 int proto;
137 u32 minorversion;
138};
139
140/*
141 * Allocate a shared client record
142 *
143 * Since these are allocated/deallocated very rarely, we don't
144 * bother putting them in a slab cache...
145 */
146static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
147{
148 struct nfs_client *clp;
149 struct rpc_cred *cred;
150 int err = -ENOMEM;
151
152 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
153 goto error_0;
154
155 clp->rpc_ops = cl_init->rpc_ops;
156
157 atomic_set(&clp->cl_count, 1);
158 clp->cl_cons_state = NFS_CS_INITING;
159
160 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
161 clp->cl_addrlen = cl_init->addrlen;
162
163 if (cl_init->hostname) {
164 err = -ENOMEM;
165 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
166 if (!clp->cl_hostname)
167 goto error_cleanup;
168 }
169
170 INIT_LIST_HEAD(&clp->cl_superblocks);
171 clp->cl_rpcclient = ERR_PTR(-EINVAL);
172
173 clp->cl_proto = cl_init->proto;
174
175#ifdef CONFIG_NFS_V4
176 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
177 if (err)
178 goto error_cleanup;
179
180 spin_lock_init(&clp->cl_lock);
181 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
182 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
183 clp->cl_boot_time = CURRENT_TIME;
184 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
185 clp->cl_minorversion = cl_init->minorversion;
186 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
187#endif
188 cred = rpc_lookup_machine_cred();
189 if (!IS_ERR(cred))
190 clp->cl_machine_cred = cred;
191 nfs_fscache_get_client_cookie(clp);
192
193 return clp;
194
195error_cleanup:
196 kfree(clp);
197error_0:
198 return ERR_PTR(err);
199}
200
201#ifdef CONFIG_NFS_V4
202#ifdef CONFIG_NFS_V4_1
203static void nfs4_shutdown_session(struct nfs_client *clp)
204{
205 if (nfs4_has_session(clp))
206 nfs4_destroy_session(clp->cl_session);
207}
208#else /* CONFIG_NFS_V4_1 */
209static void nfs4_shutdown_session(struct nfs_client *clp)
210{
211}
212#endif /* CONFIG_NFS_V4_1 */
213
214/*
215 * Destroy the NFS4 callback service
216 */
217static void nfs4_destroy_callback(struct nfs_client *clp)
218{
219 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
220 nfs_callback_down(clp->cl_mvops->minor_version);
221}
222
223static void nfs4_shutdown_client(struct nfs_client *clp)
224{
225 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
226 nfs4_kill_renewd(clp);
227 nfs4_shutdown_session(clp);
228 nfs4_destroy_callback(clp);
229 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
230 nfs_idmap_delete(clp);
231
232 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
233}
234
235/* idr_remove_all is not needed as all id's are removed by nfs_put_client */
236void nfs_cleanup_cb_ident_idr(void)
237{
238 idr_destroy(&cb_ident_idr);
239}
240
241/* nfs_client_lock held */
242static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
243{
244 if (clp->cl_cb_ident)
245 idr_remove(&cb_ident_idr, clp->cl_cb_ident);
246}
247
248static void pnfs_init_server(struct nfs_server *server)
249{
250 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
251}
252
253#else
254static void nfs4_shutdown_client(struct nfs_client *clp)
255{
256}
257
258void nfs_cleanup_cb_ident_idr(void)
259{
260}
261
262static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
263{
264}
265
266static void pnfs_init_server(struct nfs_server *server)
267{
268}
269
270#endif /* CONFIG_NFS_V4 */
271
272/*
273 * Destroy a shared client record
274 */
275static void nfs_free_client(struct nfs_client *clp)
276{
277 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
278
279 nfs4_shutdown_client(clp);
280
281 nfs_fscache_release_client_cookie(clp);
282
283 /* -EIO all pending I/O */
284 if (!IS_ERR(clp->cl_rpcclient))
285 rpc_shutdown_client(clp->cl_rpcclient);
286
287 if (clp->cl_machine_cred != NULL)
288 put_rpccred(clp->cl_machine_cred);
289
290 nfs4_deviceid_purge_client(clp);
291
292 kfree(clp->cl_hostname);
293 kfree(clp->server_scope);
294 kfree(clp);
295
296 dprintk("<-- nfs_free_client()\n");
297}
298
299/*
300 * Release a reference to a shared client record
301 */
302void nfs_put_client(struct nfs_client *clp)
303{
304 if (!clp)
305 return;
306
307 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
308
309 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
310 list_del(&clp->cl_share_link);
311 nfs_cb_idr_remove_locked(clp);
312 spin_unlock(&nfs_client_lock);
313
314 BUG_ON(!list_empty(&clp->cl_superblocks));
315
316 nfs_free_client(clp);
317 }
318}
319EXPORT_SYMBOL_GPL(nfs_put_client);
320
321#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
322/*
323 * Test if two ip6 socket addresses refer to the same socket by
324 * comparing relevant fields. The padding bytes specifically, are not
325 * compared. sin6_flowinfo is not compared because it only affects QoS
326 * and sin6_scope_id is only compared if the address is "link local"
327 * because "link local" addresses need only be unique to a specific
328 * link. Conversely, ordinary unicast addresses might have different
329 * sin6_scope_id.
330 *
331 * The caller should ensure both socket addresses are AF_INET6.
332 */
333static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
334 const struct sockaddr *sa2)
335{
336 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
337 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
338
339 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
340 sin1->sin6_scope_id != sin2->sin6_scope_id)
341 return 0;
342
343 return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr);
344}
345#else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
346static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
347 const struct sockaddr *sa2)
348{
349 return 0;
350}
351#endif
352
353/*
354 * Test if two ip4 socket addresses refer to the same socket, by
355 * comparing relevant fields. The padding bytes specifically, are
356 * not compared.
357 *
358 * The caller should ensure both socket addresses are AF_INET.
359 */
360static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
361 const struct sockaddr *sa2)
362{
363 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
364 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
365
366 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
367}
368
369static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
370 const struct sockaddr *sa2)
371{
372 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
373 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
374
375 return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
376 (sin1->sin6_port == sin2->sin6_port);
377}
378
379static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
380 const struct sockaddr *sa2)
381{
382 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
383 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
384
385 return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
386 (sin1->sin_port == sin2->sin_port);
387}
388
389/*
390 * Test if two socket addresses represent the same actual socket,
391 * by comparing (only) relevant fields, excluding the port number.
392 */
393static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
394 const struct sockaddr *sa2)
395{
396 if (sa1->sa_family != sa2->sa_family)
397 return 0;
398
399 switch (sa1->sa_family) {
400 case AF_INET:
401 return nfs_sockaddr_match_ipaddr4(sa1, sa2);
402 case AF_INET6:
403 return nfs_sockaddr_match_ipaddr6(sa1, sa2);
404 }
405 return 0;
406}
407
408/*
409 * Test if two socket addresses represent the same actual socket,
410 * by comparing (only) relevant fields, including the port number.
411 */
412static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
413 const struct sockaddr *sa2)
414{
415 if (sa1->sa_family != sa2->sa_family)
416 return 0;
417
418 switch (sa1->sa_family) {
419 case AF_INET:
420 return nfs_sockaddr_cmp_ip4(sa1, sa2);
421 case AF_INET6:
422 return nfs_sockaddr_cmp_ip6(sa1, sa2);
423 }
424 return 0;
425}
426
427/* Common match routine for v4.0 and v4.1 callback services */
428bool
429nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp,
430 u32 minorversion)
431{
432 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
433
434 /* Don't match clients that failed to initialise */
435 if (!(clp->cl_cons_state == NFS_CS_READY ||
436 clp->cl_cons_state == NFS_CS_SESSION_INITING))
437 return false;
438
439 /* Match the version and minorversion */
440 if (clp->rpc_ops->version != 4 ||
441 clp->cl_minorversion != minorversion)
442 return false;
443
444 /* Match only the IP address, not the port number */
445 if (!nfs_sockaddr_match_ipaddr(addr, clap))
446 return false;
447
448 return true;
449}
450
451/*
452 * Find an nfs_client on the list that matches the initialisation data
453 * that is supplied.
454 */
455static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
456{
457 struct nfs_client *clp;
458 const struct sockaddr *sap = data->addr;
459
460 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
461 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
462 /* Don't match clients that failed to initialise properly */
463 if (clp->cl_cons_state < 0)
464 continue;
465
466 /* Different NFS versions cannot share the same nfs_client */
467 if (clp->rpc_ops != data->rpc_ops)
468 continue;
469
470 if (clp->cl_proto != data->proto)
471 continue;
472 /* Match nfsv4 minorversion */
473 if (clp->cl_minorversion != data->minorversion)
474 continue;
475 /* Match the full socket address */
476 if (!nfs_sockaddr_cmp(sap, clap))
477 continue;
478
479 atomic_inc(&clp->cl_count);
480 return clp;
481 }
482 return NULL;
483}
484
485/*
486 * Look up a client by IP address and protocol version
487 * - creates a new record if one doesn't yet exist
488 */
489static struct nfs_client *
490nfs_get_client(const struct nfs_client_initdata *cl_init,
491 const struct rpc_timeout *timeparms,
492 const char *ip_addr,
493 rpc_authflavor_t authflavour,
494 int noresvport)
495{
496 struct nfs_client *clp, *new = NULL;
497 int error;
498
499 dprintk("--> nfs_get_client(%s,v%u)\n",
500 cl_init->hostname ?: "", cl_init->rpc_ops->version);
501
502 /* see if the client already exists */
503 do {
504 spin_lock(&nfs_client_lock);
505
506 clp = nfs_match_client(cl_init);
507 if (clp)
508 goto found_client;
509 if (new)
510 goto install_client;
511
512 spin_unlock(&nfs_client_lock);
513
514 new = nfs_alloc_client(cl_init);
515 } while (!IS_ERR(new));
516
517 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
518 return new;
519
520 /* install a new client and return with it unready */
521install_client:
522 clp = new;
523 list_add(&clp->cl_share_link, &nfs_client_list);
524 spin_unlock(&nfs_client_lock);
525
526 error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr,
527 authflavour, noresvport);
528 if (error < 0) {
529 nfs_put_client(clp);
530 return ERR_PTR(error);
531 }
532 dprintk("--> nfs_get_client() = %p [new]\n", clp);
533 return clp;
534
535 /* found an existing client
536 * - make sure it's ready before returning
537 */
538found_client:
539 spin_unlock(&nfs_client_lock);
540
541 if (new)
542 nfs_free_client(new);
543
544 error = wait_event_killable(nfs_client_active_wq,
545 clp->cl_cons_state < NFS_CS_INITING);
546 if (error < 0) {
547 nfs_put_client(clp);
548 return ERR_PTR(-ERESTARTSYS);
549 }
550
551 if (clp->cl_cons_state < NFS_CS_READY) {
552 error = clp->cl_cons_state;
553 nfs_put_client(clp);
554 return ERR_PTR(error);
555 }
556
557 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
558
559 dprintk("--> nfs_get_client() = %p [share]\n", clp);
560 return clp;
561}
562
563/*
564 * Mark a server as ready or failed
565 */
566void nfs_mark_client_ready(struct nfs_client *clp, int state)
567{
568 clp->cl_cons_state = state;
569 wake_up_all(&nfs_client_active_wq);
570}
571
572/*
573 * With sessions, the client is not marked ready until after a
574 * successful EXCHANGE_ID and CREATE_SESSION.
575 *
576 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
577 * other versions of NFS can be tried.
578 */
579int nfs4_check_client_ready(struct nfs_client *clp)
580{
581 if (!nfs4_has_session(clp))
582 return 0;
583 if (clp->cl_cons_state < NFS_CS_READY)
584 return -EPROTONOSUPPORT;
585 return 0;
586}
587
588/*
589 * Initialise the timeout values for a connection
590 */
591static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
592 unsigned int timeo, unsigned int retrans)
593{
594 to->to_initval = timeo * HZ / 10;
595 to->to_retries = retrans;
596
597 switch (proto) {
598 case XPRT_TRANSPORT_TCP:
599 case XPRT_TRANSPORT_RDMA:
600 if (to->to_retries == 0)
601 to->to_retries = NFS_DEF_TCP_RETRANS;
602 if (to->to_initval == 0)
603 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
604 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
605 to->to_initval = NFS_MAX_TCP_TIMEOUT;
606 to->to_increment = to->to_initval;
607 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
608 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
609 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
610 if (to->to_maxval < to->to_initval)
611 to->to_maxval = to->to_initval;
612 to->to_exponential = 0;
613 break;
614 case XPRT_TRANSPORT_UDP:
615 if (to->to_retries == 0)
616 to->to_retries = NFS_DEF_UDP_RETRANS;
617 if (!to->to_initval)
618 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
619 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
620 to->to_initval = NFS_MAX_UDP_TIMEOUT;
621 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
622 to->to_exponential = 1;
623 break;
624 default:
625 BUG();
626 }
627}
628
629/*
630 * Create an RPC client handle
631 */
632static int nfs_create_rpc_client(struct nfs_client *clp,
633 const struct rpc_timeout *timeparms,
634 rpc_authflavor_t flavor,
635 int discrtry, int noresvport)
636{
637 struct rpc_clnt *clnt = NULL;
638 struct rpc_create_args args = {
639 .net = &init_net,
640 .protocol = clp->cl_proto,
641 .address = (struct sockaddr *)&clp->cl_addr,
642 .addrsize = clp->cl_addrlen,
643 .timeout = timeparms,
644 .servername = clp->cl_hostname,
645 .program = &nfs_program,
646 .version = clp->rpc_ops->version,
647 .authflavor = flavor,
648 };
649
650 if (discrtry)
651 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
652 if (noresvport)
653 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
654
655 if (!IS_ERR(clp->cl_rpcclient))
656 return 0;
657
658 clnt = rpc_create(&args);
659 if (IS_ERR(clnt)) {
660 dprintk("%s: cannot create RPC client. Error = %ld\n",
661 __func__, PTR_ERR(clnt));
662 return PTR_ERR(clnt);
663 }
664
665 clp->cl_rpcclient = clnt;
666 return 0;
667}
668
669/*
670 * Version 2 or 3 client destruction
671 */
672static void nfs_destroy_server(struct nfs_server *server)
673{
674 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) ||
675 !(server->flags & NFS_MOUNT_LOCAL_FCNTL))
676 nlmclnt_done(server->nlm_host);
677}
678
679/*
680 * Version 2 or 3 lockd setup
681 */
682static int nfs_start_lockd(struct nfs_server *server)
683{
684 struct nlm_host *host;
685 struct nfs_client *clp = server->nfs_client;
686 struct nlmclnt_initdata nlm_init = {
687 .hostname = clp->cl_hostname,
688 .address = (struct sockaddr *)&clp->cl_addr,
689 .addrlen = clp->cl_addrlen,
690 .nfs_version = clp->rpc_ops->version,
691 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
692 1 : 0,
693 };
694
695 if (nlm_init.nfs_version > 3)
696 return 0;
697 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
698 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
699 return 0;
700
701 switch (clp->cl_proto) {
702 default:
703 nlm_init.protocol = IPPROTO_TCP;
704 break;
705 case XPRT_TRANSPORT_UDP:
706 nlm_init.protocol = IPPROTO_UDP;
707 }
708
709 host = nlmclnt_init(&nlm_init);
710 if (IS_ERR(host))
711 return PTR_ERR(host);
712
713 server->nlm_host = host;
714 server->destroy = nfs_destroy_server;
715 return 0;
716}
717
718/*
719 * Initialise an NFSv3 ACL client connection
720 */
721#ifdef CONFIG_NFS_V3_ACL
722static void nfs_init_server_aclclient(struct nfs_server *server)
723{
724 if (server->nfs_client->rpc_ops->version != 3)
725 goto out_noacl;
726 if (server->flags & NFS_MOUNT_NOACL)
727 goto out_noacl;
728
729 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
730 if (IS_ERR(server->client_acl))
731 goto out_noacl;
732
733 /* No errors! Assume that Sun nfsacls are supported */
734 server->caps |= NFS_CAP_ACLS;
735 return;
736
737out_noacl:
738 server->caps &= ~NFS_CAP_ACLS;
739}
740#else
741static inline void nfs_init_server_aclclient(struct nfs_server *server)
742{
743 server->flags &= ~NFS_MOUNT_NOACL;
744 server->caps &= ~NFS_CAP_ACLS;
745}
746#endif
747
748/*
749 * Create a general RPC client
750 */
751static int nfs_init_server_rpcclient(struct nfs_server *server,
752 const struct rpc_timeout *timeo,
753 rpc_authflavor_t pseudoflavour)
754{
755 struct nfs_client *clp = server->nfs_client;
756
757 server->client = rpc_clone_client(clp->cl_rpcclient);
758 if (IS_ERR(server->client)) {
759 dprintk("%s: couldn't create rpc_client!\n", __func__);
760 return PTR_ERR(server->client);
761 }
762
763 memcpy(&server->client->cl_timeout_default,
764 timeo,
765 sizeof(server->client->cl_timeout_default));
766 server->client->cl_timeout = &server->client->cl_timeout_default;
767
768 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
769 struct rpc_auth *auth;
770
771 auth = rpcauth_create(pseudoflavour, server->client);
772 if (IS_ERR(auth)) {
773 dprintk("%s: couldn't create credcache!\n", __func__);
774 return PTR_ERR(auth);
775 }
776 }
777 server->client->cl_softrtry = 0;
778 if (server->flags & NFS_MOUNT_SOFT)
779 server->client->cl_softrtry = 1;
780
781 return 0;
782}
783
784/*
785 * Initialise an NFS2 or NFS3 client
786 */
787int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms,
788 const char *ip_addr, rpc_authflavor_t authflavour,
789 int noresvport)
790{
791 int error;
792
793 if (clp->cl_cons_state == NFS_CS_READY) {
794 /* the client is already initialised */
795 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
796 return 0;
797 }
798
799 /*
800 * Create a client RPC handle for doing FSSTAT with UNIX auth only
801 * - RFC 2623, sec 2.3.2
802 */
803 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX,
804 0, noresvport);
805 if (error < 0)
806 goto error;
807 nfs_mark_client_ready(clp, NFS_CS_READY);
808 return 0;
809
810error:
811 nfs_mark_client_ready(clp, error);
812 dprintk("<-- nfs_init_client() = xerror %d\n", error);
813 return error;
814}
815
816/*
817 * Create a version 2 or 3 client
818 */
819static int nfs_init_server(struct nfs_server *server,
820 const struct nfs_parsed_mount_data *data)
821{
822 struct nfs_client_initdata cl_init = {
823 .hostname = data->nfs_server.hostname,
824 .addr = (const struct sockaddr *)&data->nfs_server.address,
825 .addrlen = data->nfs_server.addrlen,
826 .rpc_ops = &nfs_v2_clientops,
827 .proto = data->nfs_server.protocol,
828 };
829 struct rpc_timeout timeparms;
830 struct nfs_client *clp;
831 int error;
832
833 dprintk("--> nfs_init_server()\n");
834
835#ifdef CONFIG_NFS_V3
836 if (data->version == 3)
837 cl_init.rpc_ops = &nfs_v3_clientops;
838#endif
839
840 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
841 data->timeo, data->retrans);
842
843 /* Allocate or find a client reference we can use */
844 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX,
845 data->flags & NFS_MOUNT_NORESVPORT);
846 if (IS_ERR(clp)) {
847 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
848 return PTR_ERR(clp);
849 }
850
851 server->nfs_client = clp;
852
853 /* Initialise the client representation from the mount data */
854 server->flags = data->flags;
855 server->options = data->options;
856 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
857 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP|
858 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME;
859
860 if (data->rsize)
861 server->rsize = nfs_block_size(data->rsize, NULL);
862 if (data->wsize)
863 server->wsize = nfs_block_size(data->wsize, NULL);
864
865 server->acregmin = data->acregmin * HZ;
866 server->acregmax = data->acregmax * HZ;
867 server->acdirmin = data->acdirmin * HZ;
868 server->acdirmax = data->acdirmax * HZ;
869
870 /* Start lockd here, before we might error out */
871 error = nfs_start_lockd(server);
872 if (error < 0)
873 goto error;
874
875 server->port = data->nfs_server.port;
876
877 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
878 if (error < 0)
879 goto error;
880
881 /* Preserve the values of mount_server-related mount options */
882 if (data->mount_server.addrlen) {
883 memcpy(&server->mountd_address, &data->mount_server.address,
884 data->mount_server.addrlen);
885 server->mountd_addrlen = data->mount_server.addrlen;
886 }
887 server->mountd_version = data->mount_server.version;
888 server->mountd_port = data->mount_server.port;
889 server->mountd_protocol = data->mount_server.protocol;
890
891 server->namelen = data->namlen;
892 /* Create a client RPC handle for the NFSv3 ACL management interface */
893 nfs_init_server_aclclient(server);
894 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
895 return 0;
896
897error:
898 server->nfs_client = NULL;
899 nfs_put_client(clp);
900 dprintk("<-- nfs_init_server() = xerror %d\n", error);
901 return error;
902}
903
904/*
905 * Load up the server record from information gained in an fsinfo record
906 */
907static void nfs_server_set_fsinfo(struct nfs_server *server,
908 struct nfs_fh *mntfh,
909 struct nfs_fsinfo *fsinfo)
910{
911 unsigned long max_rpc_payload;
912
913 /* Work out a lot of parameters */
914 if (server->rsize == 0)
915 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
916 if (server->wsize == 0)
917 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
918
919 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
920 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
921 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
922 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
923
924 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
925 if (server->rsize > max_rpc_payload)
926 server->rsize = max_rpc_payload;
927 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
928 server->rsize = NFS_MAX_FILE_IO_SIZE;
929 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
930
931 server->backing_dev_info.name = "nfs";
932 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
933
934 if (server->wsize > max_rpc_payload)
935 server->wsize = max_rpc_payload;
936 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
937 server->wsize = NFS_MAX_FILE_IO_SIZE;
938 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
939 server->pnfs_blksize = fsinfo->blksize;
940 set_pnfs_layoutdriver(server, mntfh, fsinfo->layouttype);
941
942 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
943
944 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
945 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES)
946 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES;
947 if (server->dtsize > server->rsize)
948 server->dtsize = server->rsize;
949
950 if (server->flags & NFS_MOUNT_NOAC) {
951 server->acregmin = server->acregmax = 0;
952 server->acdirmin = server->acdirmax = 0;
953 }
954
955 server->maxfilesize = fsinfo->maxfilesize;
956
957 server->time_delta = fsinfo->time_delta;
958
959 /* We're airborne Set socket buffersize */
960 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
961}
962
963/*
964 * Probe filesystem information, including the FSID on v2/v3
965 */
966static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
967{
968 struct nfs_fsinfo fsinfo;
969 struct nfs_client *clp = server->nfs_client;
970 int error;
971
972 dprintk("--> nfs_probe_fsinfo()\n");
973
974 if (clp->rpc_ops->set_capabilities != NULL) {
975 error = clp->rpc_ops->set_capabilities(server, mntfh);
976 if (error < 0)
977 goto out_error;
978 }
979
980 fsinfo.fattr = fattr;
981 fsinfo.layouttype = 0;
982 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
983 if (error < 0)
984 goto out_error;
985
986 nfs_server_set_fsinfo(server, mntfh, &fsinfo);
987
988 /* Get some general file system info */
989 if (server->namelen == 0) {
990 struct nfs_pathconf pathinfo;
991
992 pathinfo.fattr = fattr;
993 nfs_fattr_init(fattr);
994
995 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
996 server->namelen = pathinfo.max_namelen;
997 }
998
999 dprintk("<-- nfs_probe_fsinfo() = 0\n");
1000 return 0;
1001
1002out_error:
1003 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
1004 return error;
1005}
1006
1007/*
1008 * Copy useful information when duplicating a server record
1009 */
1010static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
1011{
1012 target->flags = source->flags;
1013 target->rsize = source->rsize;
1014 target->wsize = source->wsize;
1015 target->acregmin = source->acregmin;
1016 target->acregmax = source->acregmax;
1017 target->acdirmin = source->acdirmin;
1018 target->acdirmax = source->acdirmax;
1019 target->caps = source->caps;
1020 target->options = source->options;
1021}
1022
1023static void nfs_server_insert_lists(struct nfs_server *server)
1024{
1025 struct nfs_client *clp = server->nfs_client;
1026
1027 spin_lock(&nfs_client_lock);
1028 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
1029 list_add_tail(&server->master_link, &nfs_volume_list);
1030 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1031 spin_unlock(&nfs_client_lock);
1032
1033}
1034
1035static void nfs_server_remove_lists(struct nfs_server *server)
1036{
1037 struct nfs_client *clp = server->nfs_client;
1038
1039 spin_lock(&nfs_client_lock);
1040 list_del_rcu(&server->client_link);
1041 if (clp && list_empty(&clp->cl_superblocks))
1042 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
1043 list_del(&server->master_link);
1044 spin_unlock(&nfs_client_lock);
1045
1046 synchronize_rcu();
1047}
1048
1049/*
1050 * Allocate and initialise a server record
1051 */
1052static struct nfs_server *nfs_alloc_server(void)
1053{
1054 struct nfs_server *server;
1055
1056 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1057 if (!server)
1058 return NULL;
1059
1060 server->client = server->client_acl = ERR_PTR(-EINVAL);
1061
1062 /* Zero out the NFS state stuff */
1063 INIT_LIST_HEAD(&server->client_link);
1064 INIT_LIST_HEAD(&server->master_link);
1065 INIT_LIST_HEAD(&server->delegations);
1066 INIT_LIST_HEAD(&server->layouts);
1067
1068 atomic_set(&server->active, 0);
1069
1070 server->io_stats = nfs_alloc_iostats();
1071 if (!server->io_stats) {
1072 kfree(server);
1073 return NULL;
1074 }
1075
1076 if (bdi_init(&server->backing_dev_info)) {
1077 nfs_free_iostats(server->io_stats);
1078 kfree(server);
1079 return NULL;
1080 }
1081
1082 pnfs_init_server(server);
1083
1084 return server;
1085}
1086
1087/*
1088 * Free up a server record
1089 */
1090void nfs_free_server(struct nfs_server *server)
1091{
1092 dprintk("--> nfs_free_server()\n");
1093
1094 nfs_server_remove_lists(server);
1095 unset_pnfs_layoutdriver(server);
1096
1097 if (server->destroy != NULL)
1098 server->destroy(server);
1099
1100 if (!IS_ERR(server->client_acl))
1101 rpc_shutdown_client(server->client_acl);
1102 if (!IS_ERR(server->client))
1103 rpc_shutdown_client(server->client);
1104
1105 nfs_put_client(server->nfs_client);
1106
1107 nfs_free_iostats(server->io_stats);
1108 bdi_destroy(&server->backing_dev_info);
1109 kfree(server);
1110 nfs_release_automount_timer();
1111 dprintk("<-- nfs_free_server()\n");
1112}
1113
1114/*
1115 * Create a version 2 or 3 volume record
1116 * - keyed on server and FSID
1117 */
1118struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
1119 struct nfs_fh *mntfh)
1120{
1121 struct nfs_server *server;
1122 struct nfs_fattr *fattr;
1123 int error;
1124
1125 server = nfs_alloc_server();
1126 if (!server)
1127 return ERR_PTR(-ENOMEM);
1128
1129 error = -ENOMEM;
1130 fattr = nfs_alloc_fattr();
1131 if (fattr == NULL)
1132 goto error;
1133
1134 /* Get a client representation */
1135 error = nfs_init_server(server, data);
1136 if (error < 0)
1137 goto error;
1138
1139 BUG_ON(!server->nfs_client);
1140 BUG_ON(!server->nfs_client->rpc_ops);
1141 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1142
1143 /* Probe the root fh to retrieve its FSID */
1144 error = nfs_probe_fsinfo(server, mntfh, fattr);
1145 if (error < 0)
1146 goto error;
1147 if (server->nfs_client->rpc_ops->version == 3) {
1148 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1149 server->namelen = NFS3_MAXNAMLEN;
1150 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1151 server->caps |= NFS_CAP_READDIRPLUS;
1152 } else {
1153 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1154 server->namelen = NFS2_MAXNAMLEN;
1155 }
1156
1157 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1158 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
1159 if (error < 0) {
1160 dprintk("nfs_create_server: getattr error = %d\n", -error);
1161 goto error;
1162 }
1163 }
1164 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1165
1166 dprintk("Server FSID: %llx:%llx\n",
1167 (unsigned long long) server->fsid.major,
1168 (unsigned long long) server->fsid.minor);
1169
1170 nfs_server_insert_lists(server);
1171 server->mount_time = jiffies;
1172 nfs_free_fattr(fattr);
1173 return server;
1174
1175error:
1176 nfs_free_fattr(fattr);
1177 nfs_free_server(server);
1178 return ERR_PTR(error);
1179}
1180
1181#ifdef CONFIG_NFS_V4
1182/*
1183 * NFSv4.0 callback thread helper
1184 *
1185 * Find a client by IP address, protocol version, and minorversion
1186 *
1187 * Called from the pg_authenticate method. The callback identifier
1188 * is not used as it has not been decoded.
1189 *
1190 * Returns NULL if no such client
1191 */
1192struct nfs_client *
1193nfs4_find_client_no_ident(const struct sockaddr *addr)
1194{
1195 struct nfs_client *clp;
1196
1197 spin_lock(&nfs_client_lock);
1198 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
1199 if (nfs4_cb_match_client(addr, clp, 0) == false)
1200 continue;
1201 atomic_inc(&clp->cl_count);
1202 spin_unlock(&nfs_client_lock);
1203 return clp;
1204 }
1205 spin_unlock(&nfs_client_lock);
1206 return NULL;
1207}
1208
1209/*
1210 * NFSv4.0 callback thread helper
1211 *
1212 * Find a client by callback identifier
1213 */
1214struct nfs_client *
1215nfs4_find_client_ident(int cb_ident)
1216{
1217 struct nfs_client *clp;
1218
1219 spin_lock(&nfs_client_lock);
1220 clp = idr_find(&cb_ident_idr, cb_ident);
1221 if (clp)
1222 atomic_inc(&clp->cl_count);
1223 spin_unlock(&nfs_client_lock);
1224 return clp;
1225}
1226
1227#if defined(CONFIG_NFS_V4_1)
1228/*
1229 * NFSv4.1 callback thread helper
1230 * For CB_COMPOUND calls, find a client by IP address, protocol version,
1231 * minorversion, and sessionID
1232 *
1233 * Returns NULL if no such client
1234 */
1235struct nfs_client *
1236nfs4_find_client_sessionid(const struct sockaddr *addr,
1237 struct nfs4_sessionid *sid)
1238{
1239 struct nfs_client *clp;
1240
1241 spin_lock(&nfs_client_lock);
1242 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
1243 if (nfs4_cb_match_client(addr, clp, 1) == false)
1244 continue;
1245
1246 if (!nfs4_has_session(clp))
1247 continue;
1248
1249 /* Match sessionid*/
1250 if (memcmp(clp->cl_session->sess_id.data,
1251 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
1252 continue;
1253
1254 atomic_inc(&clp->cl_count);
1255 spin_unlock(&nfs_client_lock);
1256 return clp;
1257 }
1258 spin_unlock(&nfs_client_lock);
1259 return NULL;
1260}
1261
1262#else /* CONFIG_NFS_V4_1 */
1263
1264struct nfs_client *
1265nfs4_find_client_sessionid(const struct sockaddr *addr,
1266 struct nfs4_sessionid *sid)
1267{
1268 return NULL;
1269}
1270#endif /* CONFIG_NFS_V4_1 */
1271
1272/*
1273 * Initialize the NFS4 callback service
1274 */
1275static int nfs4_init_callback(struct nfs_client *clp)
1276{
1277 int error;
1278
1279 if (clp->rpc_ops->version == 4) {
1280 if (nfs4_has_session(clp)) {
1281 error = xprt_setup_backchannel(
1282 clp->cl_rpcclient->cl_xprt,
1283 NFS41_BC_MIN_CALLBACKS);
1284 if (error < 0)
1285 return error;
1286 }
1287
1288 error = nfs_callback_up(clp->cl_mvops->minor_version,
1289 clp->cl_rpcclient->cl_xprt);
1290 if (error < 0) {
1291 dprintk("%s: failed to start callback. Error = %d\n",
1292 __func__, error);
1293 return error;
1294 }
1295 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
1296 }
1297 return 0;
1298}
1299
1300/*
1301 * Initialize the minor version specific parts of an NFS4 client record
1302 */
1303static int nfs4_init_client_minor_version(struct nfs_client *clp)
1304{
1305#if defined(CONFIG_NFS_V4_1)
1306 if (clp->cl_mvops->minor_version) {
1307 struct nfs4_session *session = NULL;
1308 /*
1309 * Create the session and mark it expired.
1310 * When a SEQUENCE operation encounters the expired session
1311 * it will do session recovery to initialize it.
1312 */
1313 session = nfs4_alloc_session(clp);
1314 if (!session)
1315 return -ENOMEM;
1316
1317 clp->cl_session = session;
1318 /*
1319 * The create session reply races with the server back
1320 * channel probe. Mark the client NFS_CS_SESSION_INITING
1321 * so that the client back channel can find the
1322 * nfs_client struct
1323 */
1324 clp->cl_cons_state = NFS_CS_SESSION_INITING;
1325 }
1326#endif /* CONFIG_NFS_V4_1 */
1327
1328 return nfs4_init_callback(clp);
1329}
1330
1331/*
1332 * Initialise an NFS4 client record
1333 */
1334int nfs4_init_client(struct nfs_client *clp,
1335 const struct rpc_timeout *timeparms,
1336 const char *ip_addr,
1337 rpc_authflavor_t authflavour,
1338 int noresvport)
1339{
1340 int error;
1341
1342 if (clp->cl_cons_state == NFS_CS_READY) {
1343 /* the client is initialised already */
1344 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
1345 return 0;
1346 }
1347
1348 /* Check NFS protocol revision and initialize RPC op vector */
1349 clp->rpc_ops = &nfs_v4_clientops;
1350
1351 error = nfs_create_rpc_client(clp, timeparms, authflavour,
1352 1, noresvport);
1353 if (error < 0)
1354 goto error;
1355 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
1356
1357 error = nfs_idmap_new(clp);
1358 if (error < 0) {
1359 dprintk("%s: failed to create idmapper. Error = %d\n",
1360 __func__, error);
1361 goto error;
1362 }
1363 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1364
1365 error = nfs4_init_client_minor_version(clp);
1366 if (error < 0)
1367 goto error;
1368
1369 if (!nfs4_has_session(clp))
1370 nfs_mark_client_ready(clp, NFS_CS_READY);
1371 return 0;
1372
1373error:
1374 nfs_mark_client_ready(clp, error);
1375 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
1376 return error;
1377}
1378
1379/*
1380 * Set up an NFS4 client
1381 */
1382static int nfs4_set_client(struct nfs_server *server,
1383 const char *hostname,
1384 const struct sockaddr *addr,
1385 const size_t addrlen,
1386 const char *ip_addr,
1387 rpc_authflavor_t authflavour,
1388 int proto, const struct rpc_timeout *timeparms,
1389 u32 minorversion)
1390{
1391 struct nfs_client_initdata cl_init = {
1392 .hostname = hostname,
1393 .addr = addr,
1394 .addrlen = addrlen,
1395 .rpc_ops = &nfs_v4_clientops,
1396 .proto = proto,
1397 .minorversion = minorversion,
1398 };
1399 struct nfs_client *clp;
1400 int error;
1401
1402 dprintk("--> nfs4_set_client()\n");
1403
1404 /* Allocate or find a client reference we can use */
1405 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour,
1406 server->flags & NFS_MOUNT_NORESVPORT);
1407 if (IS_ERR(clp)) {
1408 error = PTR_ERR(clp);
1409 goto error;
1410 }
1411
1412 /*
1413 * Query for the lease time on clientid setup or renewal
1414 *
1415 * Note that this will be set on nfs_clients that were created
1416 * only for the DS role and did not set this bit, but now will
1417 * serve a dual role.
1418 */
1419 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
1420
1421 server->nfs_client = clp;
1422 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
1423 return 0;
1424error:
1425 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
1426 return error;
1427}
1428
1429/*
1430 * Set up a pNFS Data Server client.
1431 *
1432 * Return any existing nfs_client that matches server address,port,version
1433 * and minorversion.
1434 *
1435 * For a new nfs_client, use a soft mount (default), a low retrans and a
1436 * low timeout interval so that if a connection is lost, we retry through
1437 * the MDS.
1438 */
1439struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
1440 const struct sockaddr *ds_addr,
1441 int ds_addrlen, int ds_proto)
1442{
1443 struct nfs_client_initdata cl_init = {
1444 .addr = ds_addr,
1445 .addrlen = ds_addrlen,
1446 .rpc_ops = &nfs_v4_clientops,
1447 .proto = ds_proto,
1448 .minorversion = mds_clp->cl_minorversion,
1449 };
1450 struct rpc_timeout ds_timeout = {
1451 .to_initval = 15 * HZ,
1452 .to_maxval = 15 * HZ,
1453 .to_retries = 1,
1454 .to_exponential = 1,
1455 };
1456 struct nfs_client *clp;
1457
1458 /*
1459 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
1460 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
1461 * (section 13.1 RFC 5661).
1462 */
1463 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
1464 mds_clp->cl_rpcclient->cl_auth->au_flavor, 0);
1465
1466 dprintk("<-- %s %p\n", __func__, clp);
1467 return clp;
1468}
1469EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
1470
1471/*
1472 * Session has been established, and the client marked ready.
1473 * Set the mount rsize and wsize with negotiated fore channel
1474 * attributes which will be bound checked in nfs_server_set_fsinfo.
1475 */
1476static void nfs4_session_set_rwsize(struct nfs_server *server)
1477{
1478#ifdef CONFIG_NFS_V4_1
1479 struct nfs4_session *sess;
1480 u32 server_resp_sz;
1481 u32 server_rqst_sz;
1482
1483 if (!nfs4_has_session(server->nfs_client))
1484 return;
1485 sess = server->nfs_client->cl_session;
1486 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1487 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1488
1489 if (server->rsize > server_resp_sz)
1490 server->rsize = server_resp_sz;
1491 if (server->wsize > server_rqst_sz)
1492 server->wsize = server_rqst_sz;
1493#endif /* CONFIG_NFS_V4_1 */
1494}
1495
1496static int nfs4_server_common_setup(struct nfs_server *server,
1497 struct nfs_fh *mntfh)
1498{
1499 struct nfs_fattr *fattr;
1500 int error;
1501
1502 BUG_ON(!server->nfs_client);
1503 BUG_ON(!server->nfs_client->rpc_ops);
1504 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1505
1506 /* data servers support only a subset of NFSv4.1 */
1507 if (is_ds_only_client(server->nfs_client))
1508 return -EPROTONOSUPPORT;
1509
1510 fattr = nfs_alloc_fattr();
1511 if (fattr == NULL)
1512 return -ENOMEM;
1513
1514 /* We must ensure the session is initialised first */
1515 error = nfs4_init_session(server);
1516 if (error < 0)
1517 goto out;
1518
1519 /* Probe the root fh to retrieve its FSID and filehandle */
1520 error = nfs4_get_rootfh(server, mntfh);
1521 if (error < 0)
1522 goto out;
1523
1524 dprintk("Server FSID: %llx:%llx\n",
1525 (unsigned long long) server->fsid.major,
1526 (unsigned long long) server->fsid.minor);
1527 dprintk("Mount FH: %d\n", mntfh->size);
1528
1529 nfs4_session_set_rwsize(server);
1530
1531 error = nfs_probe_fsinfo(server, mntfh, fattr);
1532 if (error < 0)
1533 goto out;
1534
1535 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1536 server->namelen = NFS4_MAXNAMLEN;
1537
1538 nfs_server_insert_lists(server);
1539 server->mount_time = jiffies;
1540out:
1541 nfs_free_fattr(fattr);
1542 return error;
1543}
1544
1545/*
1546 * Create a version 4 volume record
1547 */
1548static int nfs4_init_server(struct nfs_server *server,
1549 const struct nfs_parsed_mount_data *data)
1550{
1551 struct rpc_timeout timeparms;
1552 int error;
1553
1554 dprintk("--> nfs4_init_server()\n");
1555
1556 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1557 data->timeo, data->retrans);
1558
1559 /* Initialise the client representation from the mount data */
1560 server->flags = data->flags;
1561 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
1562 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
1563 server->caps |= NFS_CAP_READDIRPLUS;
1564 server->options = data->options;
1565
1566 /* Get a client record */
1567 error = nfs4_set_client(server,
1568 data->nfs_server.hostname,
1569 (const struct sockaddr *)&data->nfs_server.address,
1570 data->nfs_server.addrlen,
1571 data->client_address,
1572 data->auth_flavors[0],
1573 data->nfs_server.protocol,
1574 &timeparms,
1575 data->minorversion);
1576 if (error < 0)
1577 goto error;
1578
1579 /*
1580 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
1581 * authentication.
1582 */
1583 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
1584 server->caps |= NFS_CAP_UIDGID_NOMAP;
1585
1586 if (data->rsize)
1587 server->rsize = nfs_block_size(data->rsize, NULL);
1588 if (data->wsize)
1589 server->wsize = nfs_block_size(data->wsize, NULL);
1590
1591 server->acregmin = data->acregmin * HZ;
1592 server->acregmax = data->acregmax * HZ;
1593 server->acdirmin = data->acdirmin * HZ;
1594 server->acdirmax = data->acdirmax * HZ;
1595
1596 server->port = data->nfs_server.port;
1597
1598 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
1599
1600error:
1601 /* Done */
1602 dprintk("<-- nfs4_init_server() = %d\n", error);
1603 return error;
1604}
1605
1606/*
1607 * Create a version 4 volume record
1608 * - keyed on server and FSID
1609 */
1610struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1611 struct nfs_fh *mntfh)
1612{
1613 struct nfs_server *server;
1614 int error;
1615
1616 dprintk("--> nfs4_create_server()\n");
1617
1618 server = nfs_alloc_server();
1619 if (!server)
1620 return ERR_PTR(-ENOMEM);
1621
1622 /* set up the general RPC client */
1623 error = nfs4_init_server(server, data);
1624 if (error < 0)
1625 goto error;
1626
1627 error = nfs4_server_common_setup(server, mntfh);
1628 if (error < 0)
1629 goto error;
1630
1631 dprintk("<-- nfs4_create_server() = %p\n", server);
1632 return server;
1633
1634error:
1635 nfs_free_server(server);
1636 dprintk("<-- nfs4_create_server() = error %d\n", error);
1637 return ERR_PTR(error);
1638}
1639
1640/*
1641 * Create an NFS4 referral server record
1642 */
1643struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1644 struct nfs_fh *mntfh)
1645{
1646 struct nfs_client *parent_client;
1647 struct nfs_server *server, *parent_server;
1648 int error;
1649
1650 dprintk("--> nfs4_create_referral_server()\n");
1651
1652 server = nfs_alloc_server();
1653 if (!server)
1654 return ERR_PTR(-ENOMEM);
1655
1656 parent_server = NFS_SB(data->sb);
1657 parent_client = parent_server->nfs_client;
1658
1659 /* Initialise the client representation from the parent server */
1660 nfs_server_copy_userdata(server, parent_server);
1661 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
1662
1663 /* Get a client representation.
1664 * Note: NFSv4 always uses TCP, */
1665 error = nfs4_set_client(server, data->hostname,
1666 data->addr,
1667 data->addrlen,
1668 parent_client->cl_ipaddr,
1669 data->authflavor,
1670 parent_server->client->cl_xprt->prot,
1671 parent_server->client->cl_timeout,
1672 parent_client->cl_mvops->minor_version);
1673 if (error < 0)
1674 goto error;
1675
1676 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1677 if (error < 0)
1678 goto error;
1679
1680 error = nfs4_server_common_setup(server, mntfh);
1681 if (error < 0)
1682 goto error;
1683
1684 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1685 return server;
1686
1687error:
1688 nfs_free_server(server);
1689 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1690 return ERR_PTR(error);
1691}
1692
1693#endif /* CONFIG_NFS_V4 */
1694
1695/*
1696 * Clone an NFS2, NFS3 or NFS4 server record
1697 */
1698struct nfs_server *nfs_clone_server(struct nfs_server *source,
1699 struct nfs_fh *fh,
1700 struct nfs_fattr *fattr)
1701{
1702 struct nfs_server *server;
1703 struct nfs_fattr *fattr_fsinfo;
1704 int error;
1705
1706 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1707 (unsigned long long) fattr->fsid.major,
1708 (unsigned long long) fattr->fsid.minor);
1709
1710 server = nfs_alloc_server();
1711 if (!server)
1712 return ERR_PTR(-ENOMEM);
1713
1714 error = -ENOMEM;
1715 fattr_fsinfo = nfs_alloc_fattr();
1716 if (fattr_fsinfo == NULL)
1717 goto out_free_server;
1718
1719 /* Copy data from the source */
1720 server->nfs_client = source->nfs_client;
1721 atomic_inc(&server->nfs_client->cl_count);
1722 nfs_server_copy_userdata(server, source);
1723
1724 server->fsid = fattr->fsid;
1725
1726 error = nfs_init_server_rpcclient(server,
1727 source->client->cl_timeout,
1728 source->client->cl_auth->au_flavor);
1729 if (error < 0)
1730 goto out_free_server;
1731 if (!IS_ERR(source->client_acl))
1732 nfs_init_server_aclclient(server);
1733
1734 /* probe the filesystem info for this server filesystem */
1735 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo);
1736 if (error < 0)
1737 goto out_free_server;
1738
1739 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1740 server->namelen = NFS4_MAXNAMLEN;
1741
1742 dprintk("Cloned FSID: %llx:%llx\n",
1743 (unsigned long long) server->fsid.major,
1744 (unsigned long long) server->fsid.minor);
1745
1746 error = nfs_start_lockd(server);
1747 if (error < 0)
1748 goto out_free_server;
1749
1750 nfs_server_insert_lists(server);
1751 server->mount_time = jiffies;
1752
1753 nfs_free_fattr(fattr_fsinfo);
1754 dprintk("<-- nfs_clone_server() = %p\n", server);
1755 return server;
1756
1757out_free_server:
1758 nfs_free_fattr(fattr_fsinfo);
1759 nfs_free_server(server);
1760 dprintk("<-- nfs_clone_server() = error %d\n", error);
1761 return ERR_PTR(error);
1762}
1763
1764#ifdef CONFIG_PROC_FS
1765static struct proc_dir_entry *proc_fs_nfs;
1766
1767static int nfs_server_list_open(struct inode *inode, struct file *file);
1768static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1769static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1770static void nfs_server_list_stop(struct seq_file *p, void *v);
1771static int nfs_server_list_show(struct seq_file *m, void *v);
1772
1773static const struct seq_operations nfs_server_list_ops = {
1774 .start = nfs_server_list_start,
1775 .next = nfs_server_list_next,
1776 .stop = nfs_server_list_stop,
1777 .show = nfs_server_list_show,
1778};
1779
1780static const struct file_operations nfs_server_list_fops = {
1781 .open = nfs_server_list_open,
1782 .read = seq_read,
1783 .llseek = seq_lseek,
1784 .release = seq_release,
1785 .owner = THIS_MODULE,
1786};
1787
1788static int nfs_volume_list_open(struct inode *inode, struct file *file);
1789static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1790static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1791static void nfs_volume_list_stop(struct seq_file *p, void *v);
1792static int nfs_volume_list_show(struct seq_file *m, void *v);
1793
1794static const struct seq_operations nfs_volume_list_ops = {
1795 .start = nfs_volume_list_start,
1796 .next = nfs_volume_list_next,
1797 .stop = nfs_volume_list_stop,
1798 .show = nfs_volume_list_show,
1799};
1800
1801static const struct file_operations nfs_volume_list_fops = {
1802 .open = nfs_volume_list_open,
1803 .read = seq_read,
1804 .llseek = seq_lseek,
1805 .release = seq_release,
1806 .owner = THIS_MODULE,
1807};
1808
1809/*
1810 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1811 * we're dealing
1812 */
1813static int nfs_server_list_open(struct inode *inode, struct file *file)
1814{
1815 struct seq_file *m;
1816 int ret;
1817
1818 ret = seq_open(file, &nfs_server_list_ops);
1819 if (ret < 0)
1820 return ret;
1821
1822 m = file->private_data;
1823 m->private = PDE(inode)->data;
1824
1825 return 0;
1826}
1827
1828/*
1829 * set up the iterator to start reading from the server list and return the first item
1830 */
1831static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1832{
1833 /* lock the list against modification */
1834 spin_lock(&nfs_client_lock);
1835 return seq_list_start_head(&nfs_client_list, *_pos);
1836}
1837
1838/*
1839 * move to next server
1840 */
1841static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1842{
1843 return seq_list_next(v, &nfs_client_list, pos);
1844}
1845
1846/*
1847 * clean up after reading from the transports list
1848 */
1849static void nfs_server_list_stop(struct seq_file *p, void *v)
1850{
1851 spin_unlock(&nfs_client_lock);
1852}
1853
1854/*
1855 * display a header line followed by a load of call lines
1856 */
1857static int nfs_server_list_show(struct seq_file *m, void *v)
1858{
1859 struct nfs_client *clp;
1860
1861 /* display header on line 1 */
1862 if (v == &nfs_client_list) {
1863 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1864 return 0;
1865 }
1866
1867 /* display one transport per line on subsequent lines */
1868 clp = list_entry(v, struct nfs_client, cl_share_link);
1869
1870 seq_printf(m, "v%u %s %s %3d %s\n",
1871 clp->rpc_ops->version,
1872 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1873 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1874 atomic_read(&clp->cl_count),
1875 clp->cl_hostname);
1876
1877 return 0;
1878}
1879
1880/*
1881 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1882 */
1883static int nfs_volume_list_open(struct inode *inode, struct file *file)
1884{
1885 struct seq_file *m;
1886 int ret;
1887
1888 ret = seq_open(file, &nfs_volume_list_ops);
1889 if (ret < 0)
1890 return ret;
1891
1892 m = file->private_data;
1893 m->private = PDE(inode)->data;
1894
1895 return 0;
1896}
1897
1898/*
1899 * set up the iterator to start reading from the volume list and return the first item
1900 */
1901static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1902{
1903 /* lock the list against modification */
1904 spin_lock(&nfs_client_lock);
1905 return seq_list_start_head(&nfs_volume_list, *_pos);
1906}
1907
1908/*
1909 * move to next volume
1910 */
1911static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1912{
1913 return seq_list_next(v, &nfs_volume_list, pos);
1914}
1915
1916/*
1917 * clean up after reading from the transports list
1918 */
1919static void nfs_volume_list_stop(struct seq_file *p, void *v)
1920{
1921 spin_unlock(&nfs_client_lock);
1922}
1923
1924/*
1925 * display a header line followed by a load of call lines
1926 */
1927static int nfs_volume_list_show(struct seq_file *m, void *v)
1928{
1929 struct nfs_server *server;
1930 struct nfs_client *clp;
1931 char dev[8], fsid[17];
1932
1933 /* display header on line 1 */
1934 if (v == &nfs_volume_list) {
1935 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n");
1936 return 0;
1937 }
1938 /* display one transport per line on subsequent lines */
1939 server = list_entry(v, struct nfs_server, master_link);
1940 clp = server->nfs_client;
1941
1942 snprintf(dev, 8, "%u:%u",
1943 MAJOR(server->s_dev), MINOR(server->s_dev));
1944
1945 snprintf(fsid, 17, "%llx:%llx",
1946 (unsigned long long) server->fsid.major,
1947 (unsigned long long) server->fsid.minor);
1948
1949 seq_printf(m, "v%u %s %s %-7s %-17s %s\n",
1950 clp->rpc_ops->version,
1951 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1952 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1953 dev,
1954 fsid,
1955 nfs_server_fscache_state(server));
1956
1957 return 0;
1958}
1959
1960/*
1961 * initialise the /proc/fs/nfsfs/ directory
1962 */
1963int __init nfs_fs_proc_init(void)
1964{
1965 struct proc_dir_entry *p;
1966
1967 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL);
1968 if (!proc_fs_nfs)
1969 goto error_0;
1970
1971 /* a file of servers with which we're dealing */
1972 p = proc_create("servers", S_IFREG|S_IRUGO,
1973 proc_fs_nfs, &nfs_server_list_fops);
1974 if (!p)
1975 goto error_1;
1976
1977 /* a file of volumes that we have mounted */
1978 p = proc_create("volumes", S_IFREG|S_IRUGO,
1979 proc_fs_nfs, &nfs_volume_list_fops);
1980 if (!p)
1981 goto error_2;
1982 return 0;
1983
1984error_2:
1985 remove_proc_entry("servers", proc_fs_nfs);
1986error_1:
1987 remove_proc_entry("fs/nfsfs", NULL);
1988error_0:
1989 return -ENOMEM;
1990}
1991
1992/*
1993 * clean up the /proc/fs/nfsfs/ directory
1994 */
1995void nfs_fs_proc_exit(void)
1996{
1997 remove_proc_entry("volumes", proc_fs_nfs);
1998 remove_proc_entry("servers", proc_fs_nfs);
1999 remove_proc_entry("fs/nfsfs", NULL);
2000}
2001
2002#endif /* CONFIG_PROC_FS */
2003
2004module_param(nfs4_disable_idmapping, bool, 0644);
2005MODULE_PARM_DESC(nfs4_disable_idmapping,
2006 "Turn off NFSv4 idmapping when using 'sec=sys'");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* client.c: NFS client sharing and management code
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/sched.h>
12#include <linux/time.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/string.h>
16#include <linux/stat.h>
17#include <linux/errno.h>
18#include <linux/unistd.h>
19#include <linux/sunrpc/addr.h>
20#include <linux/sunrpc/clnt.h>
21#include <linux/sunrpc/stats.h>
22#include <linux/sunrpc/metrics.h>
23#include <linux/sunrpc/xprtsock.h>
24#include <linux/sunrpc/xprtrdma.h>
25#include <linux/nfs_fs.h>
26#include <linux/nfs_mount.h>
27#include <linux/nfs4_mount.h>
28#include <linux/lockd/bind.h>
29#include <linux/seq_file.h>
30#include <linux/mount.h>
31#include <linux/vfs.h>
32#include <linux/inet.h>
33#include <linux/in6.h>
34#include <linux/slab.h>
35#include <linux/idr.h>
36#include <net/ipv6.h>
37#include <linux/nfs_xdr.h>
38#include <linux/sunrpc/bc_xprt.h>
39#include <linux/nsproxy.h>
40#include <linux/pid_namespace.h>
41
42
43#include "nfs4_fs.h"
44#include "callback.h"
45#include "delegation.h"
46#include "iostat.h"
47#include "internal.h"
48#include "fscache.h"
49#include "pnfs.h"
50#include "nfs.h"
51#include "netns.h"
52#include "sysfs.h"
53#include "nfs42.h"
54
55#define NFSDBG_FACILITY NFSDBG_CLIENT
56
57static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
58static DEFINE_SPINLOCK(nfs_version_lock);
59static DEFINE_MUTEX(nfs_version_mutex);
60static LIST_HEAD(nfs_versions);
61
62/*
63 * RPC cruft for NFS
64 */
65static const struct rpc_version *nfs_version[5] = {
66 [2] = NULL,
67 [3] = NULL,
68 [4] = NULL,
69};
70
71const struct rpc_program nfs_program = {
72 .name = "nfs",
73 .number = NFS_PROGRAM,
74 .nrvers = ARRAY_SIZE(nfs_version),
75 .version = nfs_version,
76 .pipe_dir_name = NFS_PIPE_DIRNAME,
77};
78
79static struct nfs_subversion *find_nfs_version(unsigned int version)
80{
81 struct nfs_subversion *nfs;
82 spin_lock(&nfs_version_lock);
83
84 list_for_each_entry(nfs, &nfs_versions, list) {
85 if (nfs->rpc_ops->version == version) {
86 spin_unlock(&nfs_version_lock);
87 return nfs;
88 }
89 }
90
91 spin_unlock(&nfs_version_lock);
92 return ERR_PTR(-EPROTONOSUPPORT);
93}
94
95struct nfs_subversion *get_nfs_version(unsigned int version)
96{
97 struct nfs_subversion *nfs = find_nfs_version(version);
98
99 if (IS_ERR(nfs)) {
100 mutex_lock(&nfs_version_mutex);
101 request_module("nfsv%d", version);
102 nfs = find_nfs_version(version);
103 mutex_unlock(&nfs_version_mutex);
104 }
105
106 if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
107 return ERR_PTR(-EAGAIN);
108 return nfs;
109}
110
111void put_nfs_version(struct nfs_subversion *nfs)
112{
113 module_put(nfs->owner);
114}
115
116void register_nfs_version(struct nfs_subversion *nfs)
117{
118 spin_lock(&nfs_version_lock);
119
120 list_add(&nfs->list, &nfs_versions);
121 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers;
122
123 spin_unlock(&nfs_version_lock);
124}
125EXPORT_SYMBOL_GPL(register_nfs_version);
126
127void unregister_nfs_version(struct nfs_subversion *nfs)
128{
129 spin_lock(&nfs_version_lock);
130
131 nfs_version[nfs->rpc_ops->version] = NULL;
132 list_del(&nfs->list);
133
134 spin_unlock(&nfs_version_lock);
135}
136EXPORT_SYMBOL_GPL(unregister_nfs_version);
137
138/*
139 * Allocate a shared client record
140 *
141 * Since these are allocated/deallocated very rarely, we don't
142 * bother putting them in a slab cache...
143 */
144struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
145{
146 struct nfs_client *clp;
147 int err = -ENOMEM;
148
149 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
150 goto error_0;
151
152 clp->cl_minorversion = cl_init->minorversion;
153 clp->cl_nfs_mod = cl_init->nfs_mod;
154 if (!try_module_get(clp->cl_nfs_mod->owner))
155 goto error_dealloc;
156
157 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops;
158
159 refcount_set(&clp->cl_count, 1);
160 clp->cl_cons_state = NFS_CS_INITING;
161
162 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen);
163 clp->cl_addrlen = cl_init->addrlen;
164
165 if (cl_init->hostname) {
166 err = -ENOMEM;
167 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
168 if (!clp->cl_hostname)
169 goto error_cleanup;
170 }
171
172 INIT_LIST_HEAD(&clp->cl_superblocks);
173 clp->cl_rpcclient = ERR_PTR(-EINVAL);
174
175 clp->cl_flags = cl_init->init_flags;
176 clp->cl_proto = cl_init->proto;
177 clp->cl_nconnect = cl_init->nconnect;
178 clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1;
179 clp->cl_net = get_net(cl_init->net);
180
181 clp->cl_principal = "*";
182 clp->cl_xprtsec = cl_init->xprtsec;
183 return clp;
184
185error_cleanup:
186 put_nfs_version(clp->cl_nfs_mod);
187error_dealloc:
188 kfree(clp);
189error_0:
190 return ERR_PTR(err);
191}
192EXPORT_SYMBOL_GPL(nfs_alloc_client);
193
194#if IS_ENABLED(CONFIG_NFS_V4)
195static void nfs_cleanup_cb_ident_idr(struct net *net)
196{
197 struct nfs_net *nn = net_generic(net, nfs_net_id);
198
199 idr_destroy(&nn->cb_ident_idr);
200}
201
202/* nfs_client_lock held */
203static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
204{
205 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
206
207 if (clp->cl_cb_ident)
208 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
209}
210
211static void pnfs_init_server(struct nfs_server *server)
212{
213 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
214}
215
216#else
217static void nfs_cleanup_cb_ident_idr(struct net *net)
218{
219}
220
221static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
222{
223}
224
225static void pnfs_init_server(struct nfs_server *server)
226{
227}
228
229#endif /* CONFIG_NFS_V4 */
230
231/*
232 * Destroy a shared client record
233 */
234void nfs_free_client(struct nfs_client *clp)
235{
236 /* -EIO all pending I/O */
237 if (!IS_ERR(clp->cl_rpcclient))
238 rpc_shutdown_client(clp->cl_rpcclient);
239
240 put_net(clp->cl_net);
241 put_nfs_version(clp->cl_nfs_mod);
242 kfree(clp->cl_hostname);
243 kfree(clp->cl_acceptor);
244 kfree_rcu(clp, rcu);
245}
246EXPORT_SYMBOL_GPL(nfs_free_client);
247
248/*
249 * Release a reference to a shared client record
250 */
251void nfs_put_client(struct nfs_client *clp)
252{
253 struct nfs_net *nn;
254
255 if (!clp)
256 return;
257
258 nn = net_generic(clp->cl_net, nfs_net_id);
259
260 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) {
261 list_del(&clp->cl_share_link);
262 nfs_cb_idr_remove_locked(clp);
263 spin_unlock(&nn->nfs_client_lock);
264
265 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
266
267 clp->rpc_ops->free_client(clp);
268 }
269}
270EXPORT_SYMBOL_GPL(nfs_put_client);
271
272/*
273 * Find an nfs_client on the list that matches the initialisation data
274 * that is supplied.
275 */
276static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data)
277{
278 struct nfs_client *clp;
279 const struct sockaddr *sap = (struct sockaddr *)data->addr;
280 struct nfs_net *nn = net_generic(data->net, nfs_net_id);
281 int error;
282
283again:
284 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
285 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
286 /* Don't match clients that failed to initialise properly */
287 if (clp->cl_cons_state < 0)
288 continue;
289
290 /* If a client is still initializing then we need to wait */
291 if (clp->cl_cons_state > NFS_CS_READY) {
292 refcount_inc(&clp->cl_count);
293 spin_unlock(&nn->nfs_client_lock);
294 error = nfs_wait_client_init_complete(clp);
295 nfs_put_client(clp);
296 spin_lock(&nn->nfs_client_lock);
297 if (error < 0)
298 return ERR_PTR(error);
299 goto again;
300 }
301
302 /* Different NFS versions cannot share the same nfs_client */
303 if (clp->rpc_ops != data->nfs_mod->rpc_ops)
304 continue;
305
306 if (clp->cl_proto != data->proto)
307 continue;
308 /* Match nfsv4 minorversion */
309 if (clp->cl_minorversion != data->minorversion)
310 continue;
311
312 /* Match request for a dedicated DS */
313 if (test_bit(NFS_CS_DS, &data->init_flags) !=
314 test_bit(NFS_CS_DS, &clp->cl_flags))
315 continue;
316
317 /* Match the full socket address */
318 if (!rpc_cmp_addr_port(sap, clap))
319 /* Match all xprt_switch full socket addresses */
320 if (IS_ERR(clp->cl_rpcclient) ||
321 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient,
322 sap))
323 continue;
324
325 /* Match the xprt security policy */
326 if (clp->cl_xprtsec.policy != data->xprtsec.policy)
327 continue;
328
329 refcount_inc(&clp->cl_count);
330 return clp;
331 }
332 return NULL;
333}
334
335/*
336 * Return true if @clp is done initializing, false if still working on it.
337 *
338 * Use nfs_client_init_status to check if it was successful.
339 */
340bool nfs_client_init_is_complete(const struct nfs_client *clp)
341{
342 return clp->cl_cons_state <= NFS_CS_READY;
343}
344EXPORT_SYMBOL_GPL(nfs_client_init_is_complete);
345
346/*
347 * Return 0 if @clp was successfully initialized, -errno otherwise.
348 *
349 * This must be called *after* nfs_client_init_is_complete() returns true,
350 * otherwise it will pop WARN_ON_ONCE and return -EINVAL
351 */
352int nfs_client_init_status(const struct nfs_client *clp)
353{
354 /* called without checking nfs_client_init_is_complete */
355 if (clp->cl_cons_state > NFS_CS_READY) {
356 WARN_ON_ONCE(1);
357 return -EINVAL;
358 }
359 return clp->cl_cons_state;
360}
361EXPORT_SYMBOL_GPL(nfs_client_init_status);
362
363int nfs_wait_client_init_complete(const struct nfs_client *clp)
364{
365 return wait_event_killable(nfs_client_active_wq,
366 nfs_client_init_is_complete(clp));
367}
368EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
369
370/*
371 * Found an existing client. Make sure it's ready before returning.
372 */
373static struct nfs_client *
374nfs_found_client(const struct nfs_client_initdata *cl_init,
375 struct nfs_client *clp)
376{
377 int error;
378
379 error = nfs_wait_client_init_complete(clp);
380 if (error < 0) {
381 nfs_put_client(clp);
382 return ERR_PTR(-ERESTARTSYS);
383 }
384
385 if (clp->cl_cons_state < NFS_CS_READY) {
386 error = clp->cl_cons_state;
387 nfs_put_client(clp);
388 return ERR_PTR(error);
389 }
390
391 smp_rmb();
392 return clp;
393}
394
395/*
396 * Look up a client by IP address and protocol version
397 * - creates a new record if one doesn't yet exist
398 */
399struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init)
400{
401 struct nfs_client *clp, *new = NULL;
402 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
403 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops;
404
405 if (cl_init->hostname == NULL) {
406 WARN_ON(1);
407 return ERR_PTR(-EINVAL);
408 }
409
410 /* see if the client already exists */
411 do {
412 spin_lock(&nn->nfs_client_lock);
413
414 clp = nfs_match_client(cl_init);
415 if (clp) {
416 spin_unlock(&nn->nfs_client_lock);
417 if (new)
418 new->rpc_ops->free_client(new);
419 if (IS_ERR(clp))
420 return clp;
421 return nfs_found_client(cl_init, clp);
422 }
423 if (new) {
424 list_add_tail(&new->cl_share_link,
425 &nn->nfs_client_list);
426 spin_unlock(&nn->nfs_client_lock);
427 return rpc_ops->init_client(new, cl_init);
428 }
429
430 spin_unlock(&nn->nfs_client_lock);
431
432 new = rpc_ops->alloc_client(cl_init);
433 } while (!IS_ERR(new));
434
435 return new;
436}
437EXPORT_SYMBOL_GPL(nfs_get_client);
438
439/*
440 * Mark a server as ready or failed
441 */
442void nfs_mark_client_ready(struct nfs_client *clp, int state)
443{
444 smp_wmb();
445 clp->cl_cons_state = state;
446 wake_up_all(&nfs_client_active_wq);
447}
448EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
449
450/*
451 * Initialise the timeout values for a connection
452 */
453void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
454 int timeo, int retrans)
455{
456 to->to_initval = timeo * HZ / 10;
457 to->to_retries = retrans;
458
459 switch (proto) {
460 case XPRT_TRANSPORT_TCP:
461 case XPRT_TRANSPORT_TCP_TLS:
462 case XPRT_TRANSPORT_RDMA:
463 if (retrans == NFS_UNSPEC_RETRANS)
464 to->to_retries = NFS_DEF_TCP_RETRANS;
465 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
466 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10;
467 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
468 to->to_initval = NFS_MAX_TCP_TIMEOUT;
469 to->to_increment = to->to_initval;
470 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
471 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT)
472 to->to_maxval = NFS_MAX_TCP_TIMEOUT;
473 if (to->to_maxval < to->to_initval)
474 to->to_maxval = to->to_initval;
475 to->to_exponential = 0;
476 break;
477 case XPRT_TRANSPORT_UDP:
478 if (retrans == NFS_UNSPEC_RETRANS)
479 to->to_retries = NFS_DEF_UDP_RETRANS;
480 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0)
481 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10;
482 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
483 to->to_initval = NFS_MAX_UDP_TIMEOUT;
484 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
485 to->to_exponential = 1;
486 break;
487 default:
488 BUG();
489 }
490}
491EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
492
493/*
494 * Create an RPC client handle
495 */
496int nfs_create_rpc_client(struct nfs_client *clp,
497 const struct nfs_client_initdata *cl_init,
498 rpc_authflavor_t flavor)
499{
500 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
501 struct rpc_clnt *clnt = NULL;
502 struct rpc_create_args args = {
503 .net = clp->cl_net,
504 .protocol = clp->cl_proto,
505 .nconnect = clp->cl_nconnect,
506 .address = (struct sockaddr *)&clp->cl_addr,
507 .addrsize = clp->cl_addrlen,
508 .timeout = cl_init->timeparms,
509 .servername = clp->cl_hostname,
510 .nodename = cl_init->nodename,
511 .program = &nfs_program,
512 .stats = &nn->rpcstats,
513 .version = clp->rpc_ops->version,
514 .authflavor = flavor,
515 .cred = cl_init->cred,
516 .xprtsec = cl_init->xprtsec,
517 .connect_timeout = cl_init->connect_timeout,
518 .reconnect_timeout = cl_init->reconnect_timeout,
519 };
520
521 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
522 args.flags |= RPC_CLNT_CREATE_DISCRTRY;
523 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
524 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
525 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
526 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
527 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
528 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
529 if (test_bit(NFS_CS_NOPING, &clp->cl_flags))
530 args.flags |= RPC_CLNT_CREATE_NOPING;
531 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags))
532 args.flags |= RPC_CLNT_CREATE_REUSEPORT;
533
534 if (!IS_ERR(clp->cl_rpcclient))
535 return 0;
536
537 clnt = rpc_create(&args);
538 if (IS_ERR(clnt)) {
539 dprintk("%s: cannot create RPC client. Error = %ld\n",
540 __func__, PTR_ERR(clnt));
541 return PTR_ERR(clnt);
542 }
543
544 clnt->cl_principal = clp->cl_principal;
545 clp->cl_rpcclient = clnt;
546 clnt->cl_max_connect = clp->cl_max_connect;
547 return 0;
548}
549EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
550
551/*
552 * Version 2 or 3 client destruction
553 */
554static void nfs_destroy_server(struct nfs_server *server)
555{
556 if (server->nlm_host)
557 nlmclnt_done(server->nlm_host);
558}
559
560/*
561 * Version 2 or 3 lockd setup
562 */
563static int nfs_start_lockd(struct nfs_server *server)
564{
565 struct nlm_host *host;
566 struct nfs_client *clp = server->nfs_client;
567 struct nlmclnt_initdata nlm_init = {
568 .hostname = clp->cl_hostname,
569 .address = (struct sockaddr *)&clp->cl_addr,
570 .addrlen = clp->cl_addrlen,
571 .nfs_version = clp->rpc_ops->version,
572 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
573 1 : 0,
574 .net = clp->cl_net,
575 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops,
576 .cred = server->cred,
577 };
578
579 if (nlm_init.nfs_version > 3)
580 return 0;
581 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) &&
582 (server->flags & NFS_MOUNT_LOCAL_FCNTL))
583 return 0;
584
585 switch (clp->cl_proto) {
586 default:
587 nlm_init.protocol = IPPROTO_TCP;
588 break;
589#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
590 case XPRT_TRANSPORT_UDP:
591 nlm_init.protocol = IPPROTO_UDP;
592#endif
593 }
594
595 host = nlmclnt_init(&nlm_init);
596 if (IS_ERR(host))
597 return PTR_ERR(host);
598
599 server->nlm_host = host;
600 server->destroy = nfs_destroy_server;
601 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL);
602 return 0;
603}
604
605/*
606 * Create a general RPC client
607 */
608int nfs_init_server_rpcclient(struct nfs_server *server,
609 const struct rpc_timeout *timeo,
610 rpc_authflavor_t pseudoflavour)
611{
612 struct nfs_client *clp = server->nfs_client;
613
614 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient,
615 pseudoflavour);
616 if (IS_ERR(server->client)) {
617 dprintk("%s: couldn't create rpc_client!\n", __func__);
618 return PTR_ERR(server->client);
619 }
620
621 memcpy(&server->client->cl_timeout_default,
622 timeo,
623 sizeof(server->client->cl_timeout_default));
624 server->client->cl_timeout = &server->client->cl_timeout_default;
625 server->client->cl_softrtry = 0;
626 if (server->flags & NFS_MOUNT_SOFTERR)
627 server->client->cl_softerr = 1;
628 if (server->flags & NFS_MOUNT_SOFT)
629 server->client->cl_softrtry = 1;
630
631 nfs_sysfs_link_rpc_client(server, server->client, NULL);
632 return 0;
633}
634EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
635
636/**
637 * nfs_init_client - Initialise an NFS2 or NFS3 client
638 *
639 * @clp: nfs_client to initialise
640 * @cl_init: Initialisation parameters
641 *
642 * Returns pointer to an NFS client, or an ERR_PTR value.
643 */
644struct nfs_client *nfs_init_client(struct nfs_client *clp,
645 const struct nfs_client_initdata *cl_init)
646{
647 int error;
648
649 /* the client is already initialised */
650 if (clp->cl_cons_state == NFS_CS_READY)
651 return clp;
652
653 /*
654 * Create a client RPC handle for doing FSSTAT with UNIX auth only
655 * - RFC 2623, sec 2.3.2
656 */
657 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
658 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error);
659 if (error < 0) {
660 nfs_put_client(clp);
661 clp = ERR_PTR(error);
662 }
663 return clp;
664}
665EXPORT_SYMBOL_GPL(nfs_init_client);
666
667/*
668 * Create a version 2 or 3 client
669 */
670static int nfs_init_server(struct nfs_server *server,
671 const struct fs_context *fc)
672{
673 const struct nfs_fs_context *ctx = nfs_fc2context(fc);
674 struct rpc_timeout timeparms;
675 struct nfs_client_initdata cl_init = {
676 .hostname = ctx->nfs_server.hostname,
677 .addr = &ctx->nfs_server._address,
678 .addrlen = ctx->nfs_server.addrlen,
679 .nfs_mod = ctx->nfs_mod,
680 .proto = ctx->nfs_server.protocol,
681 .net = fc->net_ns,
682 .timeparms = &timeparms,
683 .cred = server->cred,
684 .nconnect = ctx->nfs_server.nconnect,
685 .init_flags = (1UL << NFS_CS_REUSEPORT),
686 .xprtsec = ctx->xprtsec,
687 };
688 struct nfs_client *clp;
689 int error;
690
691 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
692 ctx->timeo, ctx->retrans);
693 if (ctx->flags & NFS_MOUNT_NORESVPORT)
694 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
695
696 /* Allocate or find a client reference we can use */
697 clp = nfs_get_client(&cl_init);
698 if (IS_ERR(clp))
699 return PTR_ERR(clp);
700
701 server->nfs_client = clp;
702 nfs_sysfs_add_server(server);
703 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state");
704
705 /* Initialise the client representation from the mount data */
706 server->flags = ctx->flags;
707 server->options = ctx->options;
708 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS;
709
710 switch (clp->rpc_ops->version) {
711 case 2:
712 server->fattr_valid = NFS_ATTR_FATTR_V2;
713 break;
714 case 3:
715 server->fattr_valid = NFS_ATTR_FATTR_V3;
716 break;
717 default:
718 server->fattr_valid = NFS_ATTR_FATTR_V4;
719 }
720
721 if (ctx->rsize)
722 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto);
723 if (ctx->wsize)
724 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto);
725
726 server->acregmin = ctx->acregmin * HZ;
727 server->acregmax = ctx->acregmax * HZ;
728 server->acdirmin = ctx->acdirmin * HZ;
729 server->acdirmax = ctx->acdirmax * HZ;
730
731 /* Start lockd here, before we might error out */
732 error = nfs_start_lockd(server);
733 if (error < 0)
734 goto error;
735
736 server->port = ctx->nfs_server.port;
737 server->auth_info = ctx->auth_info;
738
739 error = nfs_init_server_rpcclient(server, &timeparms,
740 ctx->selected_flavor);
741 if (error < 0)
742 goto error;
743
744 /* Preserve the values of mount_server-related mount options */
745 if (ctx->mount_server.addrlen) {
746 memcpy(&server->mountd_address, &ctx->mount_server.address,
747 ctx->mount_server.addrlen);
748 server->mountd_addrlen = ctx->mount_server.addrlen;
749 }
750 server->mountd_version = ctx->mount_server.version;
751 server->mountd_port = ctx->mount_server.port;
752 server->mountd_protocol = ctx->mount_server.protocol;
753
754 server->namelen = ctx->namlen;
755 return 0;
756
757error:
758 server->nfs_client = NULL;
759 nfs_put_client(clp);
760 return error;
761}
762
763/*
764 * Load up the server record from information gained in an fsinfo record
765 */
766static void nfs_server_set_fsinfo(struct nfs_server *server,
767 struct nfs_fsinfo *fsinfo)
768{
769 struct nfs_client *clp = server->nfs_client;
770 unsigned long max_rpc_payload, raw_max_rpc_payload;
771
772 /* Work out a lot of parameters */
773 if (server->rsize == 0)
774 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto);
775 if (server->wsize == 0)
776 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto);
777
778 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
779 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto);
780 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
781 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto);
782
783 raw_max_rpc_payload = rpc_max_payload(server->client);
784 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL);
785
786 if (server->rsize > max_rpc_payload)
787 server->rsize = max_rpc_payload;
788 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
789 server->rsize = NFS_MAX_FILE_IO_SIZE;
790 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
791
792 if (server->wsize > max_rpc_payload)
793 server->wsize = max_rpc_payload;
794 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
795 server->wsize = NFS_MAX_FILE_IO_SIZE;
796 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
797
798 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
799
800 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
801 if (server->dtsize > NFS_MAX_FILE_IO_SIZE)
802 server->dtsize = NFS_MAX_FILE_IO_SIZE;
803 if (server->dtsize > server->rsize)
804 server->dtsize = server->rsize;
805
806 if (server->flags & NFS_MOUNT_NOAC) {
807 server->acregmin = server->acregmax = 0;
808 server->acdirmin = server->acdirmax = 0;
809 }
810
811 server->maxfilesize = fsinfo->maxfilesize;
812
813 server->time_delta = fsinfo->time_delta;
814 server->change_attr_type = fsinfo->change_attr_type;
815
816 server->clone_blksize = fsinfo->clone_blksize;
817 /* We're airborne Set socket buffersize */
818 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
819
820#ifdef CONFIG_NFS_V4_2
821 /*
822 * Defaults until limited by the session parameters.
823 */
824 server->gxasize = min_t(unsigned int, raw_max_rpc_payload,
825 XATTR_SIZE_MAX);
826 server->sxasize = min_t(unsigned int, raw_max_rpc_payload,
827 XATTR_SIZE_MAX);
828 server->lxasize = min_t(unsigned int, raw_max_rpc_payload,
829 nfs42_listxattr_xdrsize(XATTR_LIST_MAX));
830
831 if (fsinfo->xattr_support)
832 server->caps |= NFS_CAP_XATTR;
833#endif
834}
835
836/*
837 * Probe filesystem information, including the FSID on v2/v3
838 */
839static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
840{
841 struct nfs_fsinfo fsinfo;
842 struct nfs_client *clp = server->nfs_client;
843 int error;
844
845 if (clp->rpc_ops->set_capabilities != NULL) {
846 error = clp->rpc_ops->set_capabilities(server, mntfh);
847 if (error < 0)
848 return error;
849 }
850
851 fsinfo.fattr = fattr;
852 fsinfo.nlayouttypes = 0;
853 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype));
854 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
855 if (error < 0)
856 return error;
857
858 nfs_server_set_fsinfo(server, &fsinfo);
859
860 /* Get some general file system info */
861 if (server->namelen == 0) {
862 struct nfs_pathconf pathinfo;
863
864 pathinfo.fattr = fattr;
865 nfs_fattr_init(fattr);
866
867 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
868 server->namelen = pathinfo.max_namelen;
869 }
870
871 if (clp->rpc_ops->discover_trunking != NULL &&
872 (server->caps & NFS_CAP_FS_LOCATIONS &&
873 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) {
874 error = clp->rpc_ops->discover_trunking(server, mntfh);
875 if (error < 0)
876 return error;
877 }
878
879 return 0;
880}
881
882/*
883 * Grab the destination's particulars, including lease expiry time.
884 *
885 * Returns zero if probe succeeded and retrieved FSID matches the FSID
886 * we have cached.
887 */
888int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh)
889{
890 struct nfs_fattr *fattr;
891 int error;
892
893 fattr = nfs_alloc_fattr();
894 if (fattr == NULL)
895 return -ENOMEM;
896
897 /* Sanity: the probe won't work if the destination server
898 * does not recognize the migrated FH. */
899 error = nfs_probe_fsinfo(server, mntfh, fattr);
900
901 nfs_free_fattr(fattr);
902 return error;
903}
904EXPORT_SYMBOL_GPL(nfs_probe_server);
905
906/*
907 * Copy useful information when duplicating a server record
908 */
909void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
910{
911 target->flags = source->flags;
912 target->rsize = source->rsize;
913 target->wsize = source->wsize;
914 target->acregmin = source->acregmin;
915 target->acregmax = source->acregmax;
916 target->acdirmin = source->acdirmin;
917 target->acdirmax = source->acdirmax;
918 target->caps = source->caps;
919 target->options = source->options;
920 target->auth_info = source->auth_info;
921 target->port = source->port;
922}
923EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
924
925void nfs_server_insert_lists(struct nfs_server *server)
926{
927 struct nfs_client *clp = server->nfs_client;
928 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
929
930 spin_lock(&nn->nfs_client_lock);
931 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
932 list_add_tail(&server->master_link, &nn->nfs_volume_list);
933 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
934 spin_unlock(&nn->nfs_client_lock);
935
936}
937EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
938
939void nfs_server_remove_lists(struct nfs_server *server)
940{
941 struct nfs_client *clp = server->nfs_client;
942 struct nfs_net *nn;
943
944 if (clp == NULL)
945 return;
946 nn = net_generic(clp->cl_net, nfs_net_id);
947 spin_lock(&nn->nfs_client_lock);
948 list_del_rcu(&server->client_link);
949 if (list_empty(&clp->cl_superblocks))
950 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
951 list_del(&server->master_link);
952 spin_unlock(&nn->nfs_client_lock);
953
954 synchronize_rcu();
955}
956EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
957
958static DEFINE_IDA(s_sysfs_ids);
959
960/*
961 * Allocate and initialise a server record
962 */
963struct nfs_server *nfs_alloc_server(void)
964{
965 struct nfs_server *server;
966
967 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
968 if (!server)
969 return NULL;
970
971 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL);
972 if (server->s_sysfs_id < 0) {
973 kfree(server);
974 return NULL;
975 }
976
977 server->client = server->client_acl = ERR_PTR(-EINVAL);
978
979 /* Zero out the NFS state stuff */
980 INIT_LIST_HEAD(&server->client_link);
981 INIT_LIST_HEAD(&server->master_link);
982 INIT_LIST_HEAD(&server->delegations);
983 INIT_LIST_HEAD(&server->layouts);
984 INIT_LIST_HEAD(&server->state_owners_lru);
985 INIT_LIST_HEAD(&server->ss_copies);
986
987 atomic_set(&server->active, 0);
988
989 server->io_stats = nfs_alloc_iostats();
990 if (!server->io_stats) {
991 kfree(server);
992 return NULL;
993 }
994
995 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
996
997 ida_init(&server->openowner_id);
998 ida_init(&server->lockowner_id);
999 pnfs_init_server(server);
1000 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC");
1001
1002 return server;
1003}
1004EXPORT_SYMBOL_GPL(nfs_alloc_server);
1005
1006static void delayed_free(struct rcu_head *p)
1007{
1008 struct nfs_server *server = container_of(p, struct nfs_server, rcu);
1009
1010 nfs_free_iostats(server->io_stats);
1011 kfree(server);
1012}
1013
1014/*
1015 * Free up a server record
1016 */
1017void nfs_free_server(struct nfs_server *server)
1018{
1019 nfs_server_remove_lists(server);
1020
1021 if (server->destroy != NULL)
1022 server->destroy(server);
1023
1024 if (!IS_ERR(server->client_acl))
1025 rpc_shutdown_client(server->client_acl);
1026 if (!IS_ERR(server->client))
1027 rpc_shutdown_client(server->client);
1028
1029 nfs_put_client(server->nfs_client);
1030
1031 if (server->kobj.state_initialized) {
1032 nfs_sysfs_remove_server(server);
1033 kobject_put(&server->kobj);
1034 }
1035 ida_free(&s_sysfs_ids, server->s_sysfs_id);
1036
1037 ida_destroy(&server->lockowner_id);
1038 ida_destroy(&server->openowner_id);
1039 put_cred(server->cred);
1040 nfs_release_automount_timer();
1041 call_rcu(&server->rcu, delayed_free);
1042}
1043EXPORT_SYMBOL_GPL(nfs_free_server);
1044
1045/*
1046 * Create a version 2 or 3 volume record
1047 * - keyed on server and FSID
1048 */
1049struct nfs_server *nfs_create_server(struct fs_context *fc)
1050{
1051 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1052 struct nfs_server *server;
1053 struct nfs_fattr *fattr;
1054 int error;
1055
1056 server = nfs_alloc_server();
1057 if (!server)
1058 return ERR_PTR(-ENOMEM);
1059
1060 server->cred = get_cred(fc->cred);
1061
1062 error = -ENOMEM;
1063 fattr = nfs_alloc_fattr();
1064 if (fattr == NULL)
1065 goto error;
1066
1067 /* Get a client representation */
1068 error = nfs_init_server(server, fc);
1069 if (error < 0)
1070 goto error;
1071
1072 /* Probe the root fh to retrieve its FSID */
1073 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr);
1074 if (error < 0)
1075 goto error;
1076 if (server->nfs_client->rpc_ops->version == 3) {
1077 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
1078 server->namelen = NFS3_MAXNAMLEN;
1079 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS))
1080 server->caps |= NFS_CAP_READDIRPLUS;
1081 } else {
1082 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
1083 server->namelen = NFS2_MAXNAMLEN;
1084 }
1085
1086 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1087 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh,
1088 fattr, NULL);
1089 if (error < 0) {
1090 dprintk("nfs_create_server: getattr error = %d\n", -error);
1091 goto error;
1092 }
1093 }
1094 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
1095
1096 dprintk("Server FSID: %llx:%llx\n",
1097 (unsigned long long) server->fsid.major,
1098 (unsigned long long) server->fsid.minor);
1099
1100 nfs_server_insert_lists(server);
1101 server->mount_time = jiffies;
1102 nfs_free_fattr(fattr);
1103 return server;
1104
1105error:
1106 nfs_free_fattr(fattr);
1107 nfs_free_server(server);
1108 return ERR_PTR(error);
1109}
1110EXPORT_SYMBOL_GPL(nfs_create_server);
1111
1112/*
1113 * Clone an NFS2, NFS3 or NFS4 server record
1114 */
1115struct nfs_server *nfs_clone_server(struct nfs_server *source,
1116 struct nfs_fh *fh,
1117 struct nfs_fattr *fattr,
1118 rpc_authflavor_t flavor)
1119{
1120 struct nfs_server *server;
1121 int error;
1122
1123 server = nfs_alloc_server();
1124 if (!server)
1125 return ERR_PTR(-ENOMEM);
1126
1127 server->cred = get_cred(source->cred);
1128
1129 /* Copy data from the source */
1130 server->nfs_client = source->nfs_client;
1131 server->destroy = source->destroy;
1132 refcount_inc(&server->nfs_client->cl_count);
1133 nfs_server_copy_userdata(server, source);
1134
1135 server->fsid = fattr->fsid;
1136
1137 nfs_sysfs_add_server(server);
1138
1139 nfs_sysfs_link_rpc_client(server,
1140 server->nfs_client->cl_rpcclient, "_state");
1141
1142 error = nfs_init_server_rpcclient(server,
1143 source->client->cl_timeout,
1144 flavor);
1145 if (error < 0)
1146 goto out_free_server;
1147
1148 /* probe the filesystem info for this server filesystem */
1149 error = nfs_probe_server(server, fh);
1150 if (error < 0)
1151 goto out_free_server;
1152
1153 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1154 server->namelen = NFS4_MAXNAMLEN;
1155
1156 error = nfs_start_lockd(server);
1157 if (error < 0)
1158 goto out_free_server;
1159
1160 nfs_server_insert_lists(server);
1161 server->mount_time = jiffies;
1162
1163 return server;
1164
1165out_free_server:
1166 nfs_free_server(server);
1167 return ERR_PTR(error);
1168}
1169EXPORT_SYMBOL_GPL(nfs_clone_server);
1170
1171void nfs_clients_init(struct net *net)
1172{
1173 struct nfs_net *nn = net_generic(net, nfs_net_id);
1174
1175 INIT_LIST_HEAD(&nn->nfs_client_list);
1176 INIT_LIST_HEAD(&nn->nfs_volume_list);
1177#if IS_ENABLED(CONFIG_NFS_V4)
1178 idr_init(&nn->cb_ident_idr);
1179#endif
1180 spin_lock_init(&nn->nfs_client_lock);
1181 nn->boot_time = ktime_get_real();
1182 memset(&nn->rpcstats, 0, sizeof(nn->rpcstats));
1183 nn->rpcstats.program = &nfs_program;
1184
1185 nfs_netns_sysfs_setup(nn, net);
1186}
1187
1188void nfs_clients_exit(struct net *net)
1189{
1190 struct nfs_net *nn = net_generic(net, nfs_net_id);
1191
1192 nfs_netns_sysfs_destroy(nn);
1193 nfs_cleanup_cb_ident_idr(net);
1194 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
1195 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1196}
1197
1198#ifdef CONFIG_PROC_FS
1199static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1200static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1201static void nfs_server_list_stop(struct seq_file *p, void *v);
1202static int nfs_server_list_show(struct seq_file *m, void *v);
1203
1204static const struct seq_operations nfs_server_list_ops = {
1205 .start = nfs_server_list_start,
1206 .next = nfs_server_list_next,
1207 .stop = nfs_server_list_stop,
1208 .show = nfs_server_list_show,
1209};
1210
1211static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1212static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1213static void nfs_volume_list_stop(struct seq_file *p, void *v);
1214static int nfs_volume_list_show(struct seq_file *m, void *v);
1215
1216static const struct seq_operations nfs_volume_list_ops = {
1217 .start = nfs_volume_list_start,
1218 .next = nfs_volume_list_next,
1219 .stop = nfs_volume_list_stop,
1220 .show = nfs_volume_list_show,
1221};
1222
1223/*
1224 * set up the iterator to start reading from the server list and return the first item
1225 */
1226static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1227 __acquires(&nn->nfs_client_lock)
1228{
1229 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1230
1231 /* lock the list against modification */
1232 spin_lock(&nn->nfs_client_lock);
1233 return seq_list_start_head(&nn->nfs_client_list, *_pos);
1234}
1235
1236/*
1237 * move to next server
1238 */
1239static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1240{
1241 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1242
1243 return seq_list_next(v, &nn->nfs_client_list, pos);
1244}
1245
1246/*
1247 * clean up after reading from the transports list
1248 */
1249static void nfs_server_list_stop(struct seq_file *p, void *v)
1250 __releases(&nn->nfs_client_lock)
1251{
1252 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1253
1254 spin_unlock(&nn->nfs_client_lock);
1255}
1256
1257/*
1258 * display a header line followed by a load of call lines
1259 */
1260static int nfs_server_list_show(struct seq_file *m, void *v)
1261{
1262 struct nfs_client *clp;
1263 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1264
1265 /* display header on line 1 */
1266 if (v == &nn->nfs_client_list) {
1267 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1268 return 0;
1269 }
1270
1271 /* display one transport per line on subsequent lines */
1272 clp = list_entry(v, struct nfs_client, cl_share_link);
1273
1274 /* Check if the client is initialized */
1275 if (clp->cl_cons_state != NFS_CS_READY)
1276 return 0;
1277
1278 rcu_read_lock();
1279 seq_printf(m, "v%u %s %s %3d %s\n",
1280 clp->rpc_ops->version,
1281 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1282 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1283 refcount_read(&clp->cl_count),
1284 clp->cl_hostname);
1285 rcu_read_unlock();
1286
1287 return 0;
1288}
1289
1290/*
1291 * set up the iterator to start reading from the volume list and return the first item
1292 */
1293static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1294 __acquires(&nn->nfs_client_lock)
1295{
1296 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1297
1298 /* lock the list against modification */
1299 spin_lock(&nn->nfs_client_lock);
1300 return seq_list_start_head(&nn->nfs_volume_list, *_pos);
1301}
1302
1303/*
1304 * move to next volume
1305 */
1306static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1307{
1308 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1309
1310 return seq_list_next(v, &nn->nfs_volume_list, pos);
1311}
1312
1313/*
1314 * clean up after reading from the transports list
1315 */
1316static void nfs_volume_list_stop(struct seq_file *p, void *v)
1317 __releases(&nn->nfs_client_lock)
1318{
1319 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
1320
1321 spin_unlock(&nn->nfs_client_lock);
1322}
1323
1324/*
1325 * display a header line followed by a load of call lines
1326 */
1327static int nfs_volume_list_show(struct seq_file *m, void *v)
1328{
1329 struct nfs_server *server;
1330 struct nfs_client *clp;
1331 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
1332 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
1333 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
1334
1335 /* display header on line 1 */
1336 if (v == &nn->nfs_volume_list) {
1337 seq_puts(m, "NV SERVER PORT DEV FSID"
1338 " FSC\n");
1339 return 0;
1340 }
1341 /* display one transport per line on subsequent lines */
1342 server = list_entry(v, struct nfs_server, master_link);
1343 clp = server->nfs_client;
1344
1345 snprintf(dev, sizeof(dev), "%u:%u",
1346 MAJOR(server->s_dev), MINOR(server->s_dev));
1347
1348 snprintf(fsid, sizeof(fsid), "%llx:%llx",
1349 (unsigned long long) server->fsid.major,
1350 (unsigned long long) server->fsid.minor);
1351
1352 rcu_read_lock();
1353 seq_printf(m, "v%u %s %s %-12s %-33s %s\n",
1354 clp->rpc_ops->version,
1355 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR),
1356 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT),
1357 dev,
1358 fsid,
1359 nfs_server_fscache_state(server));
1360 rcu_read_unlock();
1361
1362 return 0;
1363}
1364
1365int nfs_fs_proc_net_init(struct net *net)
1366{
1367 struct nfs_net *nn = net_generic(net, nfs_net_id);
1368 struct proc_dir_entry *p;
1369
1370 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
1371 if (!nn->proc_nfsfs)
1372 goto error_0;
1373
1374 /* a file of servers with which we're dealing */
1375 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1376 &nfs_server_list_ops, sizeof(struct seq_net_private));
1377 if (!p)
1378 goto error_1;
1379
1380 /* a file of volumes that we have mounted */
1381 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs,
1382 &nfs_volume_list_ops, sizeof(struct seq_net_private));
1383 if (!p)
1384 goto error_1;
1385 return 0;
1386
1387error_1:
1388 remove_proc_subtree("nfsfs", net->proc_net);
1389error_0:
1390 return -ENOMEM;
1391}
1392
1393void nfs_fs_proc_net_exit(struct net *net)
1394{
1395 remove_proc_subtree("nfsfs", net->proc_net);
1396}
1397
1398/*
1399 * initialise the /proc/fs/nfsfs/ directory
1400 */
1401int __init nfs_fs_proc_init(void)
1402{
1403 if (!proc_mkdir("fs/nfsfs", NULL))
1404 goto error_0;
1405
1406 /* a file of servers with which we're dealing */
1407 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
1408 goto error_1;
1409
1410 /* a file of volumes that we have mounted */
1411 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
1412 goto error_1;
1413
1414 return 0;
1415error_1:
1416 remove_proc_subtree("fs/nfsfs", NULL);
1417error_0:
1418 return -ENOMEM;
1419}
1420
1421/*
1422 * clean up the /proc/fs/nfsfs/ directory
1423 */
1424void nfs_fs_proc_exit(void)
1425{
1426 remove_proc_subtree("fs/nfsfs", NULL);
1427 ida_destroy(&s_sysfs_ids);
1428}
1429
1430#endif /* CONFIG_PROC_FS */