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>
16 #include <linux/sunrpc/stats.h>
17 #include <linux/sunrpc/svcsock.h>
18 #include <linux/sunrpc/svc_xprt.h>
19 #include <linux/lockd/bind.h>
20 #include <linux/nfsacl.h>
21 #include <linux/seq_file.h>
22 #include <linux/inetdevice.h>
23 #include <net/addrconf.h>
25 #include <net/net_namespace.h>
31 #define NFSDDBG_FACILITY NFSDDBG_SVC
33 extern struct svc_program nfsd_program
;
34 static int nfsd(void *vrqstp
);
37 * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and the members
38 * of the svc_serv struct. In particular, ->sv_nrthreads but also to some
39 * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
41 * If (out side the lock) nn->nfsd_serv is non-NULL, then it must point to a
42 * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number
43 * of nfsd threads must exist and each must listed in ->sp_all_threads in each
44 * entry of ->sv_pools[].
46 * Transitions of the thread count between zero and non-zero are of particular
47 * interest since the svc_serv needs to be created and initialized at that
50 * Finally, the nfsd_mutex also protects some of the global variables that are
51 * accessed when nfsd starts and that are settable via the write_* routines in
52 * nfsctl.c. In particular:
54 * user_recovery_dirname
58 DEFINE_MUTEX(nfsd_mutex
);
61 * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
62 * nfsd_drc_max_pages limits the total amount of memory available for
63 * version 4.1 DRC caches.
64 * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
66 spinlock_t nfsd_drc_lock
;
67 unsigned long nfsd_drc_max_mem
;
68 unsigned long nfsd_drc_mem_used
;
70 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
71 static struct svc_stat nfsd_acl_svcstats
;
72 static const struct svc_version
*nfsd_acl_version
[] = {
73 [2] = &nfsd_acl_version2
,
74 [3] = &nfsd_acl_version3
,
77 #define NFSD_ACL_MINVERS 2
78 #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
79 static const struct svc_version
*nfsd_acl_versions
[NFSD_ACL_NRVERS
];
81 static struct svc_program nfsd_acl_program
= {
82 .pg_prog
= NFS_ACL_PROGRAM
,
83 .pg_nvers
= NFSD_ACL_NRVERS
,
84 .pg_vers
= nfsd_acl_versions
,
87 .pg_stats
= &nfsd_acl_svcstats
,
88 .pg_authenticate
= &svc_set_client
,
91 static struct svc_stat nfsd_acl_svcstats
= {
92 .program
= &nfsd_acl_program
,
94 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
96 static const struct svc_version
*nfsd_version
[] = {
98 #if defined(CONFIG_NFSD_V3)
101 #if defined(CONFIG_NFSD_V4)
102 [4] = &nfsd_version4
,
106 #define NFSD_MINVERS 2
107 #define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
108 static const struct svc_version
*nfsd_versions
[NFSD_NRVERS
];
110 struct svc_program nfsd_program
= {
111 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
112 .pg_next
= &nfsd_acl_program
,
114 .pg_prog
= NFS_PROGRAM
, /* program number */
115 .pg_nvers
= NFSD_NRVERS
, /* nr of entries in nfsd_version */
116 .pg_vers
= nfsd_versions
, /* version table */
117 .pg_name
= "nfsd", /* program name */
118 .pg_class
= "nfsd", /* authentication class */
119 .pg_stats
= &nfsd_svcstats
, /* version table */
120 .pg_authenticate
= &svc_set_client
, /* export authentication */
124 static bool nfsd_supported_minorversions
[NFSD_SUPPORTED_MINOR_VERSION
+ 1] = {
130 int nfsd_vers(int vers
, enum vers_op change
)
132 if (vers
< NFSD_MINVERS
|| vers
>= NFSD_NRVERS
)
136 nfsd_versions
[vers
] = nfsd_version
[vers
];
137 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
138 if (vers
< NFSD_ACL_NRVERS
)
139 nfsd_acl_versions
[vers
] = nfsd_acl_version
[vers
];
143 nfsd_versions
[vers
] = NULL
;
144 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
145 if (vers
< NFSD_ACL_NRVERS
)
146 nfsd_acl_versions
[vers
] = NULL
;
150 return nfsd_versions
[vers
] != NULL
;
152 return nfsd_version
[vers
] != NULL
;
158 nfsd_adjust_nfsd_versions4(void)
162 for (i
= 0; i
<= NFSD_SUPPORTED_MINOR_VERSION
; i
++) {
163 if (nfsd_supported_minorversions
[i
])
166 nfsd_vers(4, NFSD_CLEAR
);
169 int nfsd_minorversion(u32 minorversion
, enum vers_op change
)
171 if (minorversion
> NFSD_SUPPORTED_MINOR_VERSION
&&
172 change
!= NFSD_AVAIL
)
176 nfsd_supported_minorversions
[minorversion
] = true;
177 nfsd_vers(4, NFSD_SET
);
180 nfsd_supported_minorversions
[minorversion
] = false;
181 nfsd_adjust_nfsd_versions4();
184 return nfsd_supported_minorversions
[minorversion
];
186 return minorversion
<= NFSD_SUPPORTED_MINOR_VERSION
;
192 * Maximum number of nfsd processes
194 #define NFSD_MAXSERVS 8192
196 int nfsd_nrthreads(struct net
*net
)
199 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
201 mutex_lock(&nfsd_mutex
);
203 rv
= nn
->nfsd_serv
->sv_nrthreads
;
204 mutex_unlock(&nfsd_mutex
);
208 static int nfsd_init_socks(struct net
*net
)
211 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
213 if (!list_empty(&nn
->nfsd_serv
->sv_permsocks
))
216 error
= svc_create_xprt(nn
->nfsd_serv
, "udp", net
, PF_INET
, NFS_PORT
,
221 error
= svc_create_xprt(nn
->nfsd_serv
, "tcp", net
, PF_INET
, NFS_PORT
,
229 static int nfsd_users
= 0;
231 static int nfsd_startup_generic(int nrservs
)
239 * Readahead param cache - will no-op if it already exists.
240 * (Note therefore results will be suboptimal if number of
241 * threads is modified after nfsd start.)
243 ret
= nfsd_racache_init(2*nrservs
);
247 ret
= nfs4_state_start();
253 nfsd_racache_shutdown();
259 static void nfsd_shutdown_generic(void)
264 nfs4_state_shutdown();
265 nfsd_racache_shutdown();
268 static bool nfsd_needs_lockd(void)
270 #if defined(CONFIG_NFSD_V3)
271 return (nfsd_versions
[2] != NULL
) || (nfsd_versions
[3] != NULL
);
273 return (nfsd_versions
[2] != NULL
);
277 static int nfsd_startup_net(int nrservs
, struct net
*net
)
279 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
285 ret
= nfsd_startup_generic(nrservs
);
288 ret
= nfsd_init_socks(net
);
292 if (nfsd_needs_lockd() && !nn
->lockd_up
) {
299 ret
= nfs4_state_start_net(net
);
303 nn
->nfsd_net_up
= true;
312 nfsd_shutdown_generic();
316 static void nfsd_shutdown_net(struct net
*net
)
318 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
320 nfs4_state_shutdown_net(net
);
325 nn
->nfsd_net_up
= false;
326 nfsd_shutdown_generic();
329 static int nfsd_inetaddr_event(struct notifier_block
*this, unsigned long event
,
332 struct in_ifaddr
*ifa
= (struct in_ifaddr
*)ptr
;
333 struct net_device
*dev
= ifa
->ifa_dev
->dev
;
334 struct net
*net
= dev_net(dev
);
335 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
336 struct sockaddr_in sin
;
338 if (event
!= NETDEV_DOWN
)
342 dprintk("nfsd_inetaddr_event: removed %pI4\n", &ifa
->ifa_local
);
343 sin
.sin_family
= AF_INET
;
344 sin
.sin_addr
.s_addr
= ifa
->ifa_local
;
345 svc_age_temp_xprts_now(nn
->nfsd_serv
, (struct sockaddr
*)&sin
);
352 static struct notifier_block nfsd_inetaddr_notifier
= {
353 .notifier_call
= nfsd_inetaddr_event
,
356 #if IS_ENABLED(CONFIG_IPV6)
357 static int nfsd_inet6addr_event(struct notifier_block
*this,
358 unsigned long event
, void *ptr
)
360 struct inet6_ifaddr
*ifa
= (struct inet6_ifaddr
*)ptr
;
361 struct net_device
*dev
= ifa
->idev
->dev
;
362 struct net
*net
= dev_net(dev
);
363 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
364 struct sockaddr_in6 sin6
;
366 if (event
!= NETDEV_DOWN
)
370 dprintk("nfsd_inet6addr_event: removed %pI6\n", &ifa
->addr
);
371 sin6
.sin6_family
= AF_INET6
;
372 sin6
.sin6_addr
= ifa
->addr
;
373 if (ipv6_addr_type(&sin6
.sin6_addr
) & IPV6_ADDR_LINKLOCAL
)
374 sin6
.sin6_scope_id
= ifa
->idev
->dev
->ifindex
;
375 svc_age_temp_xprts_now(nn
->nfsd_serv
, (struct sockaddr
*)&sin6
);
382 static struct notifier_block nfsd_inet6addr_notifier
= {
383 .notifier_call
= nfsd_inet6addr_event
,
387 /* Only used under nfsd_mutex, so this atomic may be overkill: */
388 static atomic_t nfsd_notifier_refcount
= ATOMIC_INIT(0);
390 static void nfsd_last_thread(struct svc_serv
*serv
, struct net
*net
)
392 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
394 /* check if the notifier still has clients */
395 if (atomic_dec_return(&nfsd_notifier_refcount
) == 0) {
396 unregister_inetaddr_notifier(&nfsd_inetaddr_notifier
);
397 #if IS_ENABLED(CONFIG_IPV6)
398 unregister_inet6addr_notifier(&nfsd_inet6addr_notifier
);
403 * write_ports can create the server without actually starting
404 * any threads--if we get shut down before any threads are
405 * started, then nfsd_last_thread will be run before any of this
406 * other initialization has been done except the rpcb information.
408 svc_rpcb_cleanup(serv
, net
);
409 if (!nn
->nfsd_net_up
)
412 nfsd_shutdown_net(net
);
413 printk(KERN_WARNING
"nfsd: last server has exited, flushing export "
415 nfsd_export_flush(net
);
418 void nfsd_reset_versions(void)
422 for (i
= 0; i
< NFSD_NRVERS
; i
++)
423 if (nfsd_vers(i
, NFSD_TEST
))
426 for (i
= 0; i
< NFSD_NRVERS
; i
++)
428 nfsd_vers(i
, NFSD_SET
);
431 while (nfsd_minorversion(minor
, NFSD_SET
) >= 0)
437 * Each session guarantees a negotiated per slot memory cache for replies
438 * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
439 * NFSv4.1 server might want to use more memory for a DRC than a machine
440 * with mutiple services.
442 * Impose a hard limit on the number of pages for the DRC which varies
443 * according to the machines free pages. This is of course only a default.
445 * For now this is a #defined shift which could be under admin control
448 static void set_max_drc(void)
450 #define NFSD_DRC_SIZE_SHIFT 10
451 nfsd_drc_max_mem
= (nr_free_buffer_pages()
452 >> NFSD_DRC_SIZE_SHIFT
) * PAGE_SIZE
;
453 nfsd_drc_mem_used
= 0;
454 spin_lock_init(&nfsd_drc_lock
);
455 dprintk("%s nfsd_drc_max_mem %lu \n", __func__
, nfsd_drc_max_mem
);
458 static int nfsd_get_default_max_blksize(void)
461 unsigned long long target
;
465 target
= (i
.totalram
- i
.totalhigh
) << PAGE_SHIFT
;
467 * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig
468 * machines, but only uses 32K on 128M machines. Bottom out at
469 * 8K on 32M and smaller. Of course, this is only a default.
473 ret
= NFSSVC_MAXBLKSIZE
;
474 while (ret
> target
&& ret
>= 8*1024*2)
479 static const struct svc_serv_ops nfsd_thread_sv_ops
= {
480 .svo_shutdown
= nfsd_last_thread
,
481 .svo_function
= nfsd
,
482 .svo_enqueue_xprt
= svc_xprt_do_enqueue
,
483 .svo_setup
= svc_set_num_threads
,
484 .svo_module
= THIS_MODULE
,
487 int nfsd_create_serv(struct net
*net
)
490 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
492 WARN_ON(!mutex_is_locked(&nfsd_mutex
));
494 svc_get(nn
->nfsd_serv
);
497 if (nfsd_max_blksize
== 0)
498 nfsd_max_blksize
= nfsd_get_default_max_blksize();
499 nfsd_reset_versions();
500 nn
->nfsd_serv
= svc_create_pooled(&nfsd_program
, nfsd_max_blksize
,
501 &nfsd_thread_sv_ops
);
502 if (nn
->nfsd_serv
== NULL
)
505 nn
->nfsd_serv
->sv_maxconn
= nn
->max_connections
;
506 error
= svc_bind(nn
->nfsd_serv
, net
);
508 svc_destroy(nn
->nfsd_serv
);
513 /* check if the notifier is already set */
514 if (atomic_inc_return(&nfsd_notifier_refcount
) == 1) {
515 register_inetaddr_notifier(&nfsd_inetaddr_notifier
);
516 #if IS_ENABLED(CONFIG_IPV6)
517 register_inet6addr_notifier(&nfsd_inet6addr_notifier
);
520 do_gettimeofday(&nn
->nfssvc_boot
); /* record boot time */
524 int nfsd_nrpools(struct net
*net
)
526 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
528 if (nn
->nfsd_serv
== NULL
)
531 return nn
->nfsd_serv
->sv_nrpools
;
534 int nfsd_get_nrthreads(int n
, int *nthreads
, struct net
*net
)
537 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
539 if (nn
->nfsd_serv
!= NULL
) {
540 for (i
= 0; i
< nn
->nfsd_serv
->sv_nrpools
&& i
< n
; i
++)
541 nthreads
[i
] = nn
->nfsd_serv
->sv_pools
[i
].sp_nrthreads
;
547 void nfsd_destroy(struct net
*net
)
549 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
550 int destroy
= (nn
->nfsd_serv
->sv_nrthreads
== 1);
553 svc_shutdown_net(nn
->nfsd_serv
, net
);
554 svc_destroy(nn
->nfsd_serv
);
556 nn
->nfsd_serv
= NULL
;
559 int nfsd_set_nrthreads(int n
, int *nthreads
, struct net
*net
)
564 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
566 WARN_ON(!mutex_is_locked(&nfsd_mutex
));
568 if (nn
->nfsd_serv
== NULL
|| n
<= 0)
571 if (n
> nn
->nfsd_serv
->sv_nrpools
)
572 n
= nn
->nfsd_serv
->sv_nrpools
;
574 /* enforce a global maximum number of threads */
576 for (i
= 0; i
< n
; i
++) {
577 nthreads
[i
] = min(nthreads
[i
], NFSD_MAXSERVS
);
580 if (tot
> NFSD_MAXSERVS
) {
581 /* total too large: scale down requested numbers */
582 for (i
= 0; i
< n
&& tot
> 0; i
++) {
583 int new = nthreads
[i
] * NFSD_MAXSERVS
/ tot
;
584 tot
-= (nthreads
[i
] - new);
587 for (i
= 0; i
< n
&& tot
> 0; i
++) {
594 * There must always be a thread in pool 0; the admin
595 * can't shut down NFS completely using pool_threads.
597 if (nthreads
[0] == 0)
600 /* apply the new numbers */
601 svc_get(nn
->nfsd_serv
);
602 for (i
= 0; i
< n
; i
++) {
603 err
= nn
->nfsd_serv
->sv_ops
->svo_setup(nn
->nfsd_serv
,
604 &nn
->nfsd_serv
->sv_pools
[i
], nthreads
[i
]);
613 * Adjust the number of threads and return the new number of threads.
614 * This is also the function that starts the server if necessary, if
615 * this is the first time nrservs is nonzero.
618 nfsd_svc(int nrservs
, struct net
*net
)
622 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
624 mutex_lock(&nfsd_mutex
);
625 dprintk("nfsd: creating service\n");
627 nrservs
= max(nrservs
, 0);
628 nrservs
= min(nrservs
, NFSD_MAXSERVS
);
631 if (nrservs
== 0 && nn
->nfsd_serv
== NULL
)
634 error
= nfsd_create_serv(net
);
638 nfsd_up_before
= nn
->nfsd_net_up
;
640 error
= nfsd_startup_net(nrservs
, net
);
643 error
= nn
->nfsd_serv
->sv_ops
->svo_setup(nn
->nfsd_serv
,
647 /* We are holding a reference to nn->nfsd_serv which
648 * we don't want to count in the return value,
651 error
= nn
->nfsd_serv
->sv_nrthreads
- 1;
653 if (error
< 0 && !nfsd_up_before
)
654 nfsd_shutdown_net(net
);
656 nfsd_destroy(net
); /* Release server */
658 mutex_unlock(&nfsd_mutex
);
664 * This is the NFS server kernel thread
669 struct svc_rqst
*rqstp
= (struct svc_rqst
*) vrqstp
;
670 struct svc_xprt
*perm_sock
= list_entry(rqstp
->rq_server
->sv_permsocks
.next
, typeof(struct svc_xprt
), xpt_list
);
671 struct net
*net
= perm_sock
->xpt_net
;
672 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
675 /* Lock module and set up kernel thread */
676 mutex_lock(&nfsd_mutex
);
678 /* At this point, the thread shares current->fs
679 * with the init process. We need to create files with the
680 * umask as defined by the client instead of init's umask. */
681 if (unshare_fs_struct() < 0) {
682 printk("Unable to start nfsd thread: out of memory\n");
686 current
->fs
->umask
= 0;
689 * thread is spawned with all signals set to SIG_IGN, re-enable
690 * the ones that will bring down the thread
692 allow_signal(SIGKILL
);
693 allow_signal(SIGHUP
);
694 allow_signal(SIGINT
);
695 allow_signal(SIGQUIT
);
698 mutex_unlock(&nfsd_mutex
);
703 * The main request loop
706 /* Update sv_maxconn if it has changed */
707 rqstp
->rq_server
->sv_maxconn
= nn
->max_connections
;
710 * Find a socket with data available and call its
713 while ((err
= svc_recv(rqstp
, 60*60*HZ
)) == -EAGAIN
)
717 validate_process_creds();
719 validate_process_creds();
722 /* Clear signals before calling svc_exit_thread() */
723 flush_signals(current
);
725 mutex_lock(&nfsd_mutex
);
729 rqstp
->rq_server
= NULL
;
731 /* Release the thread */
732 svc_exit_thread(rqstp
);
737 mutex_unlock(&nfsd_mutex
);
738 module_put_and_exit(0);
742 static __be32
map_new_errors(u32 vers
, __be32 nfserr
)
744 if (nfserr
== nfserr_jukebox
&& vers
== 2)
745 return nfserr_dropit
;
746 if (nfserr
== nfserr_wrongsec
&& vers
< 4)
752 * A write procedure can have a large argument, and a read procedure can
753 * have a large reply, but no NFSv2 or NFSv3 procedure has argument and
754 * reply that can both be larger than a page. The xdr code has taken
755 * advantage of this assumption to be a sloppy about bounds checking in
756 * some cases. Pending a rewrite of the NFSv2/v3 xdr code to fix that
757 * problem, we enforce these assumptions here:
759 static bool nfs_request_too_big(struct svc_rqst
*rqstp
,
760 const struct svc_procedure
*proc
)
763 * The ACL code has more careful bounds-checking and is not
764 * susceptible to this problem:
766 if (rqstp
->rq_prog
!= NFS_PROGRAM
)
769 * Ditto NFSv4 (which can in theory have argument and reply both
772 if (rqstp
->rq_vers
>= 4)
774 /* The reply will be small, we're OK: */
775 if (proc
->pc_xdrressize
> 0 &&
776 proc
->pc_xdrressize
< XDR_QUADLEN(PAGE_SIZE
))
779 return rqstp
->rq_arg
.len
> PAGE_SIZE
;
783 nfsd_dispatch(struct svc_rqst
*rqstp
, __be32
*statp
)
785 const struct svc_procedure
*proc
;
789 dprintk("nfsd_dispatch: vers %d proc %d\n",
790 rqstp
->rq_vers
, rqstp
->rq_proc
);
791 proc
= rqstp
->rq_procinfo
;
793 if (nfs_request_too_big(rqstp
, proc
)) {
794 dprintk("nfsd: NFSv%d argument too large\n", rqstp
->rq_vers
);
795 *statp
= rpc_garbage_args
;
799 * Give the xdr decoder a chance to change this if it wants
800 * (necessary in the NFSv4.0 compound case)
802 rqstp
->rq_cachetype
= proc
->pc_cachetype
;
803 /* Decode arguments */
804 if (proc
->pc_decode
&&
805 !proc
->pc_decode(rqstp
, (__be32
*)rqstp
->rq_arg
.head
[0].iov_base
)) {
806 dprintk("nfsd: failed to decode arguments!\n");
807 *statp
= rpc_garbage_args
;
811 /* Check whether we have this call in the cache. */
812 switch (nfsd_cache_lookup(rqstp
)) {
821 /* need to grab the location to store the status, as
822 * nfsv4 does some encoding while processing
824 nfserrp
= rqstp
->rq_res
.head
[0].iov_base
825 + rqstp
->rq_res
.head
[0].iov_len
;
826 rqstp
->rq_res
.head
[0].iov_len
+= sizeof(__be32
);
828 /* Now call the procedure handler, and encode NFS status. */
829 nfserr
= proc
->pc_func(rqstp
);
830 nfserr
= map_new_errors(rqstp
->rq_vers
, nfserr
);
831 if (nfserr
== nfserr_dropit
|| test_bit(RQ_DROPME
, &rqstp
->rq_flags
)) {
832 dprintk("nfsd: Dropping request; may be revisited later\n");
833 nfsd_cache_update(rqstp
, RC_NOCACHE
, NULL
);
837 if (rqstp
->rq_proc
!= 0)
841 * For NFSv2, additional info is never returned in case of an error.
843 if (!(nfserr
&& rqstp
->rq_vers
== 2)) {
844 if (proc
->pc_encode
&& !proc
->pc_encode(rqstp
, nfserrp
)) {
845 /* Failed to encode result. Release cache entry */
846 dprintk("nfsd: failed to encode result!\n");
847 nfsd_cache_update(rqstp
, RC_NOCACHE
, NULL
);
848 *statp
= rpc_system_err
;
853 /* Store reply in cache. */
854 nfsd_cache_update(rqstp
, rqstp
->rq_cachetype
, statp
+ 1);
858 int nfsd_pool_stats_open(struct inode
*inode
, struct file
*file
)
861 struct nfsd_net
*nn
= net_generic(inode
->i_sb
->s_fs_info
, nfsd_net_id
);
863 mutex_lock(&nfsd_mutex
);
864 if (nn
->nfsd_serv
== NULL
) {
865 mutex_unlock(&nfsd_mutex
);
868 /* bump up the psudo refcount while traversing */
869 svc_get(nn
->nfsd_serv
);
870 ret
= svc_pool_stats_open(nn
->nfsd_serv
, file
);
871 mutex_unlock(&nfsd_mutex
);
875 int nfsd_pool_stats_release(struct inode
*inode
, struct file
*file
)
877 int ret
= seq_release(inode
, file
);
878 struct net
*net
= inode
->i_sb
->s_fs_info
;
880 mutex_lock(&nfsd_mutex
);
881 /* this function really, really should have been called svc_put() */
883 mutex_unlock(&nfsd_mutex
);