1 // SPDX-License-Identifier: GPL-2.0
3 * Central processing for nfsd.
5 * Authors: Olaf Kirch (okir@monad.swb.de)
7 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
10 #include <linux/sched/signal.h>
11 #include <linux/freezer.h>
12 #include <linux/module.h>
13 #include <linux/fs_struct.h>
14 #include <linux/swap.h>
15 #include <linux/siphash.h>
17 #include <linux/sunrpc/stats.h>
18 #include <linux/sunrpc/svcsock.h>
19 #include <linux/sunrpc/svc_xprt.h>
20 #include <linux/lockd/bind.h>
21 #include <linux/nfsacl.h>
22 #include <linux/seq_file.h>
23 #include <linux/inetdevice.h>
24 #include <net/addrconf.h>
26 #include <net/net_namespace.h>
31 #include "filecache.h"
35 #define NFSDDBG_FACILITY NFSDDBG_SVC
37 extern struct svc_program nfsd_program;
38 static int nfsd(void *vrqstp);
39 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
40 static int nfsd_acl_rpcbind_set(struct net *,
41 const struct svc_program *,
45 static __be32 nfsd_acl_init_request(struct svc_rqst *,
46 const struct svc_program *,
47 struct svc_process_info *);
49 static int nfsd_rpcbind_set(struct net *,
50 const struct svc_program *,
54 static __be32 nfsd_init_request(struct svc_rqst *,
55 const struct svc_program *,
56 struct svc_process_info *);
59 * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and some members
60 * of the svc_serv struct such as ->sv_temp_socks and ->sv_permsocks.
62 * Finally, the nfsd_mutex also protects some of the global variables that are
63 * accessed when nfsd starts and that are settable via the write_* routines in
64 * nfsctl.c. In particular:
66 * user_recovery_dirname
70 DEFINE_MUTEX(nfsd_mutex);
73 * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
74 * nfsd_drc_max_pages limits the total amount of memory available for
75 * version 4.1 DRC caches.
76 * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
78 DEFINE_SPINLOCK(nfsd_drc_lock);
79 unsigned long nfsd_drc_max_mem;
80 unsigned long nfsd_drc_mem_used;
82 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
83 static struct svc_stat nfsd_acl_svcstats;
84 static const struct svc_version *nfsd_acl_version[] = {
85 # if defined(CONFIG_NFSD_V2_ACL)
86 [2] = &nfsd_acl_version2,
88 # if defined(CONFIG_NFSD_V3_ACL)
89 [3] = &nfsd_acl_version3,
93 #define NFSD_ACL_MINVERS 2
94 #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
96 static struct svc_program nfsd_acl_program = {
97 .pg_prog = NFS_ACL_PROGRAM,
98 .pg_nvers = NFSD_ACL_NRVERS,
99 .pg_vers = nfsd_acl_version,
102 .pg_stats = &nfsd_acl_svcstats,
103 .pg_authenticate = &svc_set_client,
104 .pg_init_request = nfsd_acl_init_request,
105 .pg_rpcbind_set = nfsd_acl_rpcbind_set,
108 static struct svc_stat nfsd_acl_svcstats = {
109 .program = &nfsd_acl_program,
111 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
113 static const struct svc_version *nfsd_version[] = {
114 #if defined(CONFIG_NFSD_V2)
115 [2] = &nfsd_version2,
117 [3] = &nfsd_version3,
118 #if defined(CONFIG_NFSD_V4)
119 [4] = &nfsd_version4,
123 #define NFSD_MINVERS 2
124 #define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
126 struct svc_program nfsd_program = {
127 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
128 .pg_next = &nfsd_acl_program,
130 .pg_prog = NFS_PROGRAM, /* program number */
131 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
132 .pg_vers = nfsd_version, /* version table */
133 .pg_name = "nfsd", /* program name */
134 .pg_class = "nfsd", /* authentication class */
135 .pg_stats = &nfsd_svcstats, /* version table */
136 .pg_authenticate = &svc_set_client, /* export authentication */
137 .pg_init_request = nfsd_init_request,
138 .pg_rpcbind_set = nfsd_rpcbind_set,
142 nfsd_support_version(int vers)
144 if (vers >= NFSD_MINVERS && vers < NFSD_NRVERS)
145 return nfsd_version[vers] != NULL;
150 nfsd_alloc_versions(void)
152 bool *vers = kmalloc_array(NFSD_NRVERS, sizeof(bool), GFP_KERNEL);
156 /* All compiled versions are enabled by default */
157 for (i = 0; i < NFSD_NRVERS; i++)
158 vers[i] = nfsd_support_version(i);
164 nfsd_alloc_minorversions(void)
166 bool *vers = kmalloc_array(NFSD_SUPPORTED_MINOR_VERSION + 1,
167 sizeof(bool), GFP_KERNEL);
171 /* All minor versions are enabled by default */
172 for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++)
173 vers[i] = nfsd_support_version(4);
179 nfsd_netns_free_versions(struct nfsd_net *nn)
181 kfree(nn->nfsd_versions);
182 kfree(nn->nfsd4_minorversions);
183 nn->nfsd_versions = NULL;
184 nn->nfsd4_minorversions = NULL;
188 nfsd_netns_init_versions(struct nfsd_net *nn)
190 if (!nn->nfsd_versions) {
191 nn->nfsd_versions = nfsd_alloc_versions();
192 nn->nfsd4_minorversions = nfsd_alloc_minorversions();
193 if (!nn->nfsd_versions || !nn->nfsd4_minorversions)
194 nfsd_netns_free_versions(nn);
198 int nfsd_vers(struct nfsd_net *nn, int vers, enum vers_op change)
200 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
204 if (nn->nfsd_versions)
205 nn->nfsd_versions[vers] = nfsd_support_version(vers);
208 nfsd_netns_init_versions(nn);
209 if (nn->nfsd_versions)
210 nn->nfsd_versions[vers] = false;
213 if (nn->nfsd_versions)
214 return nn->nfsd_versions[vers];
217 return nfsd_support_version(vers);
223 nfsd_adjust_nfsd_versions4(struct nfsd_net *nn)
227 for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++) {
228 if (nn->nfsd4_minorversions[i])
231 nfsd_vers(nn, 4, NFSD_CLEAR);
234 int nfsd_minorversion(struct nfsd_net *nn, u32 minorversion, enum vers_op change)
236 if (minorversion > NFSD_SUPPORTED_MINOR_VERSION &&
237 change != NFSD_AVAIL)
242 if (nn->nfsd4_minorversions) {
243 nfsd_vers(nn, 4, NFSD_SET);
244 nn->nfsd4_minorversions[minorversion] =
245 nfsd_vers(nn, 4, NFSD_TEST);
249 nfsd_netns_init_versions(nn);
250 if (nn->nfsd4_minorversions) {
251 nn->nfsd4_minorversions[minorversion] = false;
252 nfsd_adjust_nfsd_versions4(nn);
256 if (nn->nfsd4_minorversions)
257 return nn->nfsd4_minorversions[minorversion];
258 return nfsd_vers(nn, 4, NFSD_TEST);
260 return minorversion <= NFSD_SUPPORTED_MINOR_VERSION &&
261 nfsd_vers(nn, 4, NFSD_AVAIL);
267 * Maximum number of nfsd processes
269 #define NFSD_MAXSERVS 8192
271 int nfsd_nrthreads(struct net *net)
274 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
276 mutex_lock(&nfsd_mutex);
278 rv = nn->nfsd_serv->sv_nrthreads;
279 mutex_unlock(&nfsd_mutex);
283 static int nfsd_init_socks(struct net *net, const struct cred *cred)
286 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
288 if (!list_empty(&nn->nfsd_serv->sv_permsocks))
291 error = svc_xprt_create(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT,
292 SVC_SOCK_DEFAULTS, cred);
296 error = svc_xprt_create(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT,
297 SVC_SOCK_DEFAULTS, cred);
304 static int nfsd_users = 0;
306 static int nfsd_startup_generic(void)
313 ret = nfsd_file_cache_init();
317 ret = nfs4_state_start();
323 nfsd_file_cache_shutdown();
329 static void nfsd_shutdown_generic(void)
334 nfs4_state_shutdown();
335 nfsd_file_cache_shutdown();
338 static bool nfsd_needs_lockd(struct nfsd_net *nn)
340 return nfsd_vers(nn, 2, NFSD_TEST) || nfsd_vers(nn, 3, NFSD_TEST);
344 * nfsd_copy_write_verifier - Atomically copy a write verifier
345 * @verf: buffer in which to receive the verifier cookie
346 * @nn: NFS net namespace
348 * This function provides a wait-free mechanism for copying the
349 * namespace's write verifier without tearing it.
351 void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn)
356 seq = read_seqbegin(&nn->writeverf_lock);
357 memcpy(verf, nn->writeverf, sizeof(nn->writeverf));
358 } while (read_seqretry(&nn->writeverf_lock, seq));
361 static void nfsd_reset_write_verifier_locked(struct nfsd_net *nn)
363 struct timespec64 now;
367 * Because the time value is hashed, y2038 time_t overflow
368 * is irrelevant in this usage.
370 ktime_get_raw_ts64(&now);
371 verf = siphash_2u64(now.tv_sec, now.tv_nsec, &nn->siphash_key);
372 memcpy(nn->writeverf, &verf, sizeof(nn->writeverf));
376 * nfsd_reset_write_verifier - Generate a new write verifier
377 * @nn: NFS net namespace
379 * This function updates the ->writeverf field of @nn. This field
380 * contains an opaque cookie that, according to Section 18.32.3 of
381 * RFC 8881, "the client can use to determine whether a server has
382 * changed instance state (e.g., server restart) between a call to
383 * WRITE and a subsequent call to either WRITE or COMMIT. This
384 * cookie MUST be unchanged during a single instance of the NFSv4.1
385 * server and MUST be unique between instances of the NFSv4.1
388 void nfsd_reset_write_verifier(struct nfsd_net *nn)
390 write_seqlock(&nn->writeverf_lock);
391 nfsd_reset_write_verifier_locked(nn);
392 write_sequnlock(&nn->writeverf_lock);
396 * Crank up a set of per-namespace resources for a new NFSD instance,
397 * including lockd, a duplicate reply cache, an open file cache
398 * instance, and a cache of NFSv4 state objects.
400 static int nfsd_startup_net(struct net *net, const struct cred *cred)
402 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
408 ret = nfsd_startup_generic();
411 ret = nfsd_init_socks(net, cred);
415 if (nfsd_needs_lockd(nn) && !nn->lockd_up) {
416 ret = lockd_up(net, cred);
422 ret = nfsd_file_cache_start_net(net);
426 ret = nfsd_reply_cache_init(nn);
430 ret = nfs4_state_start_net(net);
432 goto out_reply_cache;
434 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
435 nfsd4_ssc_init_umount_work(nn);
437 nn->nfsd_net_up = true;
441 nfsd_reply_cache_shutdown(nn);
443 nfsd_file_cache_shutdown_net(net);
447 nn->lockd_up = false;
450 nfsd_shutdown_generic();
454 static void nfsd_shutdown_net(struct net *net)
456 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
458 nfs4_state_shutdown_net(net);
459 nfsd_reply_cache_shutdown(nn);
460 nfsd_file_cache_shutdown_net(net);
463 nn->lockd_up = false;
465 nn->nfsd_net_up = false;
466 nfsd_shutdown_generic();
469 static DEFINE_SPINLOCK(nfsd_notifier_lock);
470 static int nfsd_inetaddr_event(struct notifier_block *this, unsigned long event,
473 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
474 struct net_device *dev = ifa->ifa_dev->dev;
475 struct net *net = dev_net(dev);
476 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
477 struct sockaddr_in sin;
479 if (event != NETDEV_DOWN || !nn->nfsd_serv)
482 spin_lock(&nfsd_notifier_lock);
484 dprintk("nfsd_inetaddr_event: removed %pI4\n", &ifa->ifa_local);
485 sin.sin_family = AF_INET;
486 sin.sin_addr.s_addr = ifa->ifa_local;
487 svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin);
489 spin_unlock(&nfsd_notifier_lock);
495 static struct notifier_block nfsd_inetaddr_notifier = {
496 .notifier_call = nfsd_inetaddr_event,
499 #if IS_ENABLED(CONFIG_IPV6)
500 static int nfsd_inet6addr_event(struct notifier_block *this,
501 unsigned long event, void *ptr)
503 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
504 struct net_device *dev = ifa->idev->dev;
505 struct net *net = dev_net(dev);
506 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
507 struct sockaddr_in6 sin6;
509 if (event != NETDEV_DOWN || !nn->nfsd_serv)
512 spin_lock(&nfsd_notifier_lock);
514 dprintk("nfsd_inet6addr_event: removed %pI6\n", &ifa->addr);
515 sin6.sin6_family = AF_INET6;
516 sin6.sin6_addr = ifa->addr;
517 if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
518 sin6.sin6_scope_id = ifa->idev->dev->ifindex;
519 svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin6);
521 spin_unlock(&nfsd_notifier_lock);
527 static struct notifier_block nfsd_inet6addr_notifier = {
528 .notifier_call = nfsd_inet6addr_event,
532 /* Only used under nfsd_mutex, so this atomic may be overkill: */
533 static atomic_t nfsd_notifier_refcount = ATOMIC_INIT(0);
536 * nfsd_destroy_serv - tear down NFSD's svc_serv for a namespace
537 * @net: network namespace the NFS service is associated with
539 void nfsd_destroy_serv(struct net *net)
541 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
542 struct svc_serv *serv = nn->nfsd_serv;
544 spin_lock(&nfsd_notifier_lock);
545 nn->nfsd_serv = NULL;
546 spin_unlock(&nfsd_notifier_lock);
548 /* check if the notifier still has clients */
549 if (atomic_dec_return(&nfsd_notifier_refcount) == 0) {
550 unregister_inetaddr_notifier(&nfsd_inetaddr_notifier);
551 #if IS_ENABLED(CONFIG_IPV6)
552 unregister_inet6addr_notifier(&nfsd_inet6addr_notifier);
556 svc_xprt_destroy_all(serv, net);
559 * write_ports can create the server without actually starting
560 * any threads--if we get shut down before any threads are
561 * started, then nfsd_destroy_serv will be run before any of this
562 * other initialization has been done except the rpcb information.
564 svc_rpcb_cleanup(serv, net);
565 if (!nn->nfsd_net_up)
568 nfsd_shutdown_net(net);
569 nfsd_export_flush(net);
573 void nfsd_reset_versions(struct nfsd_net *nn)
577 for (i = 0; i < NFSD_NRVERS; i++)
578 if (nfsd_vers(nn, i, NFSD_TEST))
581 for (i = 0; i < NFSD_NRVERS; i++)
583 nfsd_vers(nn, i, NFSD_SET);
586 while (nfsd_minorversion(nn, minor, NFSD_SET) >= 0)
592 * Each session guarantees a negotiated per slot memory cache for replies
593 * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
594 * NFSv4.1 server might want to use more memory for a DRC than a machine
595 * with mutiple services.
597 * Impose a hard limit on the number of pages for the DRC which varies
598 * according to the machines free pages. This is of course only a default.
600 * For now this is a #defined shift which could be under admin control
603 static void set_max_drc(void)
605 #define NFSD_DRC_SIZE_SHIFT 7
606 nfsd_drc_max_mem = (nr_free_buffer_pages()
607 >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
608 nfsd_drc_mem_used = 0;
609 dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem);
612 static int nfsd_get_default_max_blksize(void)
615 unsigned long long target;
619 target = (i.totalram - i.totalhigh) << PAGE_SHIFT;
621 * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig
622 * machines, but only uses 32K on 128M machines. Bottom out at
623 * 8K on 32M and smaller. Of course, this is only a default.
627 ret = NFSSVC_MAXBLKSIZE;
628 while (ret > target && ret >= 8*1024*2)
633 void nfsd_shutdown_threads(struct net *net)
635 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
636 struct svc_serv *serv;
638 mutex_lock(&nfsd_mutex);
639 serv = nn->nfsd_serv;
641 mutex_unlock(&nfsd_mutex);
645 /* Kill outstanding nfsd threads */
646 svc_set_num_threads(serv, NULL, 0);
647 nfsd_destroy_serv(net);
648 mutex_unlock(&nfsd_mutex);
653 return kthread_func(current) == nfsd;
656 int nfsd_create_serv(struct net *net)
659 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
660 struct svc_serv *serv;
662 WARN_ON(!mutex_is_locked(&nfsd_mutex));
666 if (nfsd_max_blksize == 0)
667 nfsd_max_blksize = nfsd_get_default_max_blksize();
668 nfsd_reset_versions(nn);
669 serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, nfsd);
673 serv->sv_maxconn = nn->max_connections;
674 error = svc_bind(serv, net);
679 spin_lock(&nfsd_notifier_lock);
680 nn->nfsd_info.mutex = &nfsd_mutex;
681 nn->nfsd_serv = serv;
682 spin_unlock(&nfsd_notifier_lock);
685 /* check if the notifier is already set */
686 if (atomic_inc_return(&nfsd_notifier_refcount) == 1) {
687 register_inetaddr_notifier(&nfsd_inetaddr_notifier);
688 #if IS_ENABLED(CONFIG_IPV6)
689 register_inet6addr_notifier(&nfsd_inet6addr_notifier);
692 nfsd_reset_write_verifier(nn);
696 int nfsd_nrpools(struct net *net)
698 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
700 if (nn->nfsd_serv == NULL)
703 return nn->nfsd_serv->sv_nrpools;
706 int nfsd_get_nrthreads(int n, int *nthreads, struct net *net)
708 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
709 struct svc_serv *serv = nn->nfsd_serv;
713 for (i = 0; i < serv->sv_nrpools && i < n; i++)
714 nthreads[i] = atomic_read(&serv->sv_pools[i].sp_nrthreads);
718 int nfsd_set_nrthreads(int n, int *nthreads, struct net *net)
723 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
725 WARN_ON(!mutex_is_locked(&nfsd_mutex));
727 if (nn->nfsd_serv == NULL || n <= 0)
730 if (n > nn->nfsd_serv->sv_nrpools)
731 n = nn->nfsd_serv->sv_nrpools;
733 /* enforce a global maximum number of threads */
735 for (i = 0; i < n; i++) {
736 nthreads[i] = min(nthreads[i], NFSD_MAXSERVS);
739 if (tot > NFSD_MAXSERVS) {
740 /* total too large: scale down requested numbers */
741 for (i = 0; i < n && tot > 0; i++) {
742 int new = nthreads[i] * NFSD_MAXSERVS / tot;
743 tot -= (nthreads[i] - new);
746 for (i = 0; i < n && tot > 0; i++) {
753 * There must always be a thread in pool 0; the admin
754 * can't shut down NFS completely using pool_threads.
756 if (nthreads[0] == 0)
759 /* apply the new numbers */
760 for (i = 0; i < n; i++) {
761 err = svc_set_num_threads(nn->nfsd_serv,
762 &nn->nfsd_serv->sv_pools[i],
771 * Adjust the number of threads and return the new number of threads.
772 * This is also the function that starts the server if necessary, if
773 * this is the first time nrservs is nonzero.
776 nfsd_svc(int nrservs, struct net *net, const struct cred *cred)
779 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
780 struct svc_serv *serv;
782 mutex_lock(&nfsd_mutex);
783 dprintk("nfsd: creating service\n");
785 nrservs = max(nrservs, 0);
786 nrservs = min(nrservs, NFSD_MAXSERVS);
789 if (nrservs == 0 && nn->nfsd_serv == NULL)
792 strscpy(nn->nfsd_name, utsname()->nodename,
793 sizeof(nn->nfsd_name));
795 error = nfsd_create_serv(net);
798 serv = nn->nfsd_serv;
800 error = nfsd_startup_net(net, cred);
803 error = svc_set_num_threads(serv, NULL, nrservs);
806 error = serv->sv_nrthreads;
808 if (serv->sv_nrthreads == 0)
809 nfsd_destroy_serv(net);
811 mutex_unlock(&nfsd_mutex);
815 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
817 nfsd_support_acl_version(int vers)
819 if (vers >= NFSD_ACL_MINVERS && vers < NFSD_ACL_NRVERS)
820 return nfsd_acl_version[vers] != NULL;
825 nfsd_acl_rpcbind_set(struct net *net, const struct svc_program *progp,
826 u32 version, int family, unsigned short proto,
829 if (!nfsd_support_acl_version(version) ||
830 !nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST))
832 return svc_generic_rpcbind_set(net, progp, version, family,
837 nfsd_acl_init_request(struct svc_rqst *rqstp,
838 const struct svc_program *progp,
839 struct svc_process_info *ret)
841 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
844 if (likely(nfsd_support_acl_version(rqstp->rq_vers) &&
845 nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST)))
846 return svc_generic_init_request(rqstp, progp, ret);
848 ret->mismatch.lovers = NFSD_ACL_NRVERS;
849 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) {
850 if (nfsd_support_acl_version(rqstp->rq_vers) &&
851 nfsd_vers(nn, i, NFSD_TEST)) {
852 ret->mismatch.lovers = i;
856 if (ret->mismatch.lovers == NFSD_ACL_NRVERS)
857 return rpc_prog_unavail;
858 ret->mismatch.hivers = NFSD_ACL_MINVERS;
859 for (i = NFSD_ACL_NRVERS - 1; i >= NFSD_ACL_MINVERS; i--) {
860 if (nfsd_support_acl_version(rqstp->rq_vers) &&
861 nfsd_vers(nn, i, NFSD_TEST)) {
862 ret->mismatch.hivers = i;
866 return rpc_prog_mismatch;
871 nfsd_rpcbind_set(struct net *net, const struct svc_program *progp,
872 u32 version, int family, unsigned short proto,
875 if (!nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST))
877 return svc_generic_rpcbind_set(net, progp, version, family,
882 nfsd_init_request(struct svc_rqst *rqstp,
883 const struct svc_program *progp,
884 struct svc_process_info *ret)
886 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
889 if (likely(nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST)))
890 return svc_generic_init_request(rqstp, progp, ret);
892 ret->mismatch.lovers = NFSD_NRVERS;
893 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
894 if (nfsd_vers(nn, i, NFSD_TEST)) {
895 ret->mismatch.lovers = i;
899 if (ret->mismatch.lovers == NFSD_NRVERS)
900 return rpc_prog_unavail;
901 ret->mismatch.hivers = NFSD_MINVERS;
902 for (i = NFSD_NRVERS - 1; i >= NFSD_MINVERS; i--) {
903 if (nfsd_vers(nn, i, NFSD_TEST)) {
904 ret->mismatch.hivers = i;
908 return rpc_prog_mismatch;
912 * This is the NFS server kernel thread
917 struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
918 struct svc_xprt *perm_sock = list_entry(rqstp->rq_server->sv_permsocks.next, typeof(struct svc_xprt), xpt_list);
919 struct net *net = perm_sock->xpt_net;
920 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
922 /* At this point, the thread shares current->fs
923 * with the init process. We need to create files with the
924 * umask as defined by the client instead of init's umask. */
925 if (unshare_fs_struct() < 0) {
926 printk("Unable to start nfsd thread: out of memory\n");
930 current->fs->umask = 0;
932 atomic_inc(&nfsdstats.th_cnt);
937 * The main request loop
939 while (!svc_thread_should_stop(rqstp)) {
940 /* Update sv_maxconn if it has changed */
941 rqstp->rq_server->sv_maxconn = nn->max_connections;
946 atomic_dec(&nfsdstats.th_cnt);
949 /* Release the thread */
950 svc_exit_thread(rqstp);
955 * nfsd_dispatch - Process an NFS or NFSACL Request
956 * @rqstp: incoming request
958 * This RPC dispatcher integrates the NFS server's duplicate reply cache.
961 * %0: Processing complete; do not send a Reply
962 * %1: Processing complete; send Reply in rqstp->rq_res
964 int nfsd_dispatch(struct svc_rqst *rqstp)
966 const struct svc_procedure *proc = rqstp->rq_procinfo;
967 __be32 *statp = rqstp->rq_accept_statp;
968 struct nfsd_cacherep *rp;
969 unsigned int start, len;
973 * Give the xdr decoder a chance to change this if it wants
974 * (necessary in the NFSv4.0 compound case)
976 rqstp->rq_cachetype = proc->pc_cachetype;
979 * ->pc_decode advances the argument stream past the NFS
980 * Call header, so grab the header's starting location and
981 * size now for the call to nfsd_cache_lookup().
983 start = xdr_stream_pos(&rqstp->rq_arg_stream);
984 len = xdr_stream_remaining(&rqstp->rq_arg_stream);
985 if (!proc->pc_decode(rqstp, &rqstp->rq_arg_stream))
989 * Release rq_status_counter setting it to an odd value after the rpc
990 * request has been properly parsed. rq_status_counter is used to
991 * notify the consumers if the rqstp fields are stable
992 * (rq_status_counter is odd) or not meaningful (rq_status_counter
995 smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter | 1);
998 switch (nfsd_cache_lookup(rqstp, start, len, &rp)) {
1002 goto out_cached_reply;
1007 nfs_reply = xdr_inline_decode(&rqstp->rq_res_stream, 0);
1008 *statp = proc->pc_func(rqstp);
1009 if (test_bit(RQ_DROPME, &rqstp->rq_flags))
1010 goto out_update_drop;
1012 if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream))
1013 goto out_encode_err;
1016 * Release rq_status_counter setting it to an even value after the rpc
1017 * request has been properly processed.
1019 smp_store_release(&rqstp->rq_status_counter, rqstp->rq_status_counter + 1);
1021 nfsd_cache_update(rqstp, rp, rqstp->rq_cachetype, nfs_reply);
1026 trace_nfsd_garbage_args_err(rqstp);
1027 *statp = rpc_garbage_args;
1031 nfsd_cache_update(rqstp, rp, RC_NOCACHE, NULL);
1036 trace_nfsd_cant_encode_err(rqstp);
1037 nfsd_cache_update(rqstp, rp, RC_NOCACHE, NULL);
1038 *statp = rpc_system_err;
1043 * nfssvc_decode_voidarg - Decode void arguments
1044 * @rqstp: Server RPC transaction context
1045 * @xdr: XDR stream positioned at arguments to decode
1048 * %false: Arguments were not valid
1049 * %true: Decoding was successful
1051 bool nfssvc_decode_voidarg(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1057 * nfssvc_encode_voidres - Encode void results
1058 * @rqstp: Server RPC transaction context
1059 * @xdr: XDR stream into which to encode results
1062 * %false: Local error while encoding
1063 * %true: Encoding was successful
1065 bool nfssvc_encode_voidres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1070 int nfsd_pool_stats_open(struct inode *inode, struct file *file)
1072 struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
1074 return svc_pool_stats_open(&nn->nfsd_info, file);