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1/*
2 * Central processing for nfsd.
3 *
4 * Authors: Olaf Kirch (okir@monad.swb.de)
5 *
6 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
7 */
8
9#include <linux/sched.h>
10#include <linux/freezer.h>
11#include <linux/fs_struct.h>
12#include <linux/swap.h>
13
14#include <linux/sunrpc/stats.h>
15#include <linux/sunrpc/svcsock.h>
16#include <linux/lockd/bind.h>
17#include <linux/nfsacl.h>
18#include <linux/seq_file.h>
19#include <net/net_namespace.h>
20#include "nfsd.h"
21#include "cache.h"
22#include "vfs.h"
23
24#define NFSDDBG_FACILITY NFSDDBG_SVC
25
26extern struct svc_program nfsd_program;
27static int nfsd(void *vrqstp);
28struct timeval nfssvc_boot;
29
30/*
31 * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members
32 * of the svc_serv struct. In particular, ->sv_nrthreads but also to some
33 * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
34 *
35 * If (out side the lock) nfsd_serv is non-NULL, then it must point to a
36 * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number
37 * of nfsd threads must exist and each must listed in ->sp_all_threads in each
38 * entry of ->sv_pools[].
39 *
40 * Transitions of the thread count between zero and non-zero are of particular
41 * interest since the svc_serv needs to be created and initialized at that
42 * point, or freed.
43 *
44 * Finally, the nfsd_mutex also protects some of the global variables that are
45 * accessed when nfsd starts and that are settable via the write_* routines in
46 * nfsctl.c. In particular:
47 *
48 * user_recovery_dirname
49 * user_lease_time
50 * nfsd_versions
51 */
52DEFINE_MUTEX(nfsd_mutex);
53struct svc_serv *nfsd_serv;
54
55/*
56 * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
57 * nfsd_drc_max_pages limits the total amount of memory available for
58 * version 4.1 DRC caches.
59 * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
60 */
61spinlock_t nfsd_drc_lock;
62unsigned int nfsd_drc_max_mem;
63unsigned int nfsd_drc_mem_used;
64
65#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
66static struct svc_stat nfsd_acl_svcstats;
67static struct svc_version * nfsd_acl_version[] = {
68 [2] = &nfsd_acl_version2,
69 [3] = &nfsd_acl_version3,
70};
71
72#define NFSD_ACL_MINVERS 2
73#define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
74static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
75
76static struct svc_program nfsd_acl_program = {
77 .pg_prog = NFS_ACL_PROGRAM,
78 .pg_nvers = NFSD_ACL_NRVERS,
79 .pg_vers = nfsd_acl_versions,
80 .pg_name = "nfsacl",
81 .pg_class = "nfsd",
82 .pg_stats = &nfsd_acl_svcstats,
83 .pg_authenticate = &svc_set_client,
84};
85
86static struct svc_stat nfsd_acl_svcstats = {
87 .program = &nfsd_acl_program,
88};
89#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
90
91static struct svc_version * nfsd_version[] = {
92 [2] = &nfsd_version2,
93#if defined(CONFIG_NFSD_V3)
94 [3] = &nfsd_version3,
95#endif
96#if defined(CONFIG_NFSD_V4)
97 [4] = &nfsd_version4,
98#endif
99};
100
101#define NFSD_MINVERS 2
102#define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
103static struct svc_version *nfsd_versions[NFSD_NRVERS];
104
105struct svc_program nfsd_program = {
106#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
107 .pg_next = &nfsd_acl_program,
108#endif
109 .pg_prog = NFS_PROGRAM, /* program number */
110 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
111 .pg_vers = nfsd_versions, /* version table */
112 .pg_name = "nfsd", /* program name */
113 .pg_class = "nfsd", /* authentication class */
114 .pg_stats = &nfsd_svcstats, /* version table */
115 .pg_authenticate = &svc_set_client, /* export authentication */
116
117};
118
119u32 nfsd_supported_minorversion;
120
121int nfsd_vers(int vers, enum vers_op change)
122{
123 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
124 return 0;
125 switch(change) {
126 case NFSD_SET:
127 nfsd_versions[vers] = nfsd_version[vers];
128#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
129 if (vers < NFSD_ACL_NRVERS)
130 nfsd_acl_versions[vers] = nfsd_acl_version[vers];
131#endif
132 break;
133 case NFSD_CLEAR:
134 nfsd_versions[vers] = NULL;
135#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
136 if (vers < NFSD_ACL_NRVERS)
137 nfsd_acl_versions[vers] = NULL;
138#endif
139 break;
140 case NFSD_TEST:
141 return nfsd_versions[vers] != NULL;
142 case NFSD_AVAIL:
143 return nfsd_version[vers] != NULL;
144 }
145 return 0;
146}
147
148int nfsd_minorversion(u32 minorversion, enum vers_op change)
149{
150 if (minorversion > NFSD_SUPPORTED_MINOR_VERSION)
151 return -1;
152 switch(change) {
153 case NFSD_SET:
154 nfsd_supported_minorversion = minorversion;
155 break;
156 case NFSD_CLEAR:
157 if (minorversion == 0)
158 return -1;
159 nfsd_supported_minorversion = minorversion - 1;
160 break;
161 case NFSD_TEST:
162 return minorversion <= nfsd_supported_minorversion;
163 case NFSD_AVAIL:
164 return minorversion <= NFSD_SUPPORTED_MINOR_VERSION;
165 }
166 return 0;
167}
168
169/*
170 * Maximum number of nfsd processes
171 */
172#define NFSD_MAXSERVS 8192
173
174int nfsd_nrthreads(void)
175{
176 int rv = 0;
177 mutex_lock(&nfsd_mutex);
178 if (nfsd_serv)
179 rv = nfsd_serv->sv_nrthreads;
180 mutex_unlock(&nfsd_mutex);
181 return rv;
182}
183
184static int nfsd_init_socks(int port)
185{
186 int error;
187 if (!list_empty(&nfsd_serv->sv_permsocks))
188 return 0;
189
190 error = svc_create_xprt(nfsd_serv, "udp", &init_net, PF_INET, port,
191 SVC_SOCK_DEFAULTS);
192 if (error < 0)
193 return error;
194
195 error = svc_create_xprt(nfsd_serv, "tcp", &init_net, PF_INET, port,
196 SVC_SOCK_DEFAULTS);
197 if (error < 0)
198 return error;
199
200 return 0;
201}
202
203static bool nfsd_up = false;
204
205static int nfsd_startup(unsigned short port, int nrservs)
206{
207 int ret;
208
209 if (nfsd_up)
210 return 0;
211 /*
212 * Readahead param cache - will no-op if it already exists.
213 * (Note therefore results will be suboptimal if number of
214 * threads is modified after nfsd start.)
215 */
216 ret = nfsd_racache_init(2*nrservs);
217 if (ret)
218 return ret;
219 ret = nfsd_init_socks(port);
220 if (ret)
221 goto out_racache;
222 ret = lockd_up();
223 if (ret)
224 goto out_racache;
225 ret = nfs4_state_start();
226 if (ret)
227 goto out_lockd;
228 nfsd_up = true;
229 return 0;
230out_lockd:
231 lockd_down();
232out_racache:
233 nfsd_racache_shutdown();
234 return ret;
235}
236
237static void nfsd_shutdown(void)
238{
239 /*
240 * write_ports can create the server without actually starting
241 * any threads--if we get shut down before any threads are
242 * started, then nfsd_last_thread will be run before any of this
243 * other initialization has been done.
244 */
245 if (!nfsd_up)
246 return;
247 nfs4_state_shutdown();
248 lockd_down();
249 nfsd_racache_shutdown();
250 nfsd_up = false;
251}
252
253static void nfsd_last_thread(struct svc_serv *serv)
254{
255 /* When last nfsd thread exits we need to do some clean-up */
256 nfsd_serv = NULL;
257 nfsd_shutdown();
258
259 printk(KERN_WARNING "nfsd: last server has exited, flushing export "
260 "cache\n");
261 nfsd_export_flush();
262}
263
264void nfsd_reset_versions(void)
265{
266 int found_one = 0;
267 int i;
268
269 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
270 if (nfsd_program.pg_vers[i])
271 found_one = 1;
272 }
273
274 if (!found_one) {
275 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
276 nfsd_program.pg_vers[i] = nfsd_version[i];
277#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
278 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
279 nfsd_acl_program.pg_vers[i] =
280 nfsd_acl_version[i];
281#endif
282 }
283}
284
285/*
286 * Each session guarantees a negotiated per slot memory cache for replies
287 * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
288 * NFSv4.1 server might want to use more memory for a DRC than a machine
289 * with mutiple services.
290 *
291 * Impose a hard limit on the number of pages for the DRC which varies
292 * according to the machines free pages. This is of course only a default.
293 *
294 * For now this is a #defined shift which could be under admin control
295 * in the future.
296 */
297static void set_max_drc(void)
298{
299 #define NFSD_DRC_SIZE_SHIFT 10
300 nfsd_drc_max_mem = (nr_free_buffer_pages()
301 >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
302 nfsd_drc_mem_used = 0;
303 spin_lock_init(&nfsd_drc_lock);
304 dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem);
305}
306
307int nfsd_create_serv(void)
308{
309 int err = 0;
310
311 WARN_ON(!mutex_is_locked(&nfsd_mutex));
312 if (nfsd_serv) {
313 svc_get(nfsd_serv);
314 return 0;
315 }
316 if (nfsd_max_blksize == 0) {
317 /* choose a suitable default */
318 struct sysinfo i;
319 si_meminfo(&i);
320 /* Aim for 1/4096 of memory per thread
321 * This gives 1MB on 4Gig machines
322 * But only uses 32K on 128M machines.
323 * Bottom out at 8K on 32M and smaller.
324 * Of course, this is only a default.
325 */
326 nfsd_max_blksize = NFSSVC_MAXBLKSIZE;
327 i.totalram <<= PAGE_SHIFT - 12;
328 while (nfsd_max_blksize > i.totalram &&
329 nfsd_max_blksize >= 8*1024*2)
330 nfsd_max_blksize /= 2;
331 }
332 nfsd_reset_versions();
333
334 nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
335 nfsd_last_thread, nfsd, THIS_MODULE);
336 if (nfsd_serv == NULL)
337 return -ENOMEM;
338
339 set_max_drc();
340 do_gettimeofday(&nfssvc_boot); /* record boot time */
341 return err;
342}
343
344int nfsd_nrpools(void)
345{
346 if (nfsd_serv == NULL)
347 return 0;
348 else
349 return nfsd_serv->sv_nrpools;
350}
351
352int nfsd_get_nrthreads(int n, int *nthreads)
353{
354 int i = 0;
355
356 if (nfsd_serv != NULL) {
357 for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++)
358 nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads;
359 }
360
361 return 0;
362}
363
364int nfsd_set_nrthreads(int n, int *nthreads)
365{
366 int i = 0;
367 int tot = 0;
368 int err = 0;
369
370 WARN_ON(!mutex_is_locked(&nfsd_mutex));
371
372 if (nfsd_serv == NULL || n <= 0)
373 return 0;
374
375 if (n > nfsd_serv->sv_nrpools)
376 n = nfsd_serv->sv_nrpools;
377
378 /* enforce a global maximum number of threads */
379 tot = 0;
380 for (i = 0; i < n; i++) {
381 if (nthreads[i] > NFSD_MAXSERVS)
382 nthreads[i] = NFSD_MAXSERVS;
383 tot += nthreads[i];
384 }
385 if (tot > NFSD_MAXSERVS) {
386 /* total too large: scale down requested numbers */
387 for (i = 0; i < n && tot > 0; i++) {
388 int new = nthreads[i] * NFSD_MAXSERVS / tot;
389 tot -= (nthreads[i] - new);
390 nthreads[i] = new;
391 }
392 for (i = 0; i < n && tot > 0; i++) {
393 nthreads[i]--;
394 tot--;
395 }
396 }
397
398 /*
399 * There must always be a thread in pool 0; the admin
400 * can't shut down NFS completely using pool_threads.
401 */
402 if (nthreads[0] == 0)
403 nthreads[0] = 1;
404
405 /* apply the new numbers */
406 svc_get(nfsd_serv);
407 for (i = 0; i < n; i++) {
408 err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i],
409 nthreads[i]);
410 if (err)
411 break;
412 }
413 svc_destroy(nfsd_serv);
414
415 return err;
416}
417
418/*
419 * Adjust the number of threads and return the new number of threads.
420 * This is also the function that starts the server if necessary, if
421 * this is the first time nrservs is nonzero.
422 */
423int
424nfsd_svc(unsigned short port, int nrservs)
425{
426 int error;
427 bool nfsd_up_before;
428
429 mutex_lock(&nfsd_mutex);
430 dprintk("nfsd: creating service\n");
431 if (nrservs <= 0)
432 nrservs = 0;
433 if (nrservs > NFSD_MAXSERVS)
434 nrservs = NFSD_MAXSERVS;
435 error = 0;
436 if (nrservs == 0 && nfsd_serv == NULL)
437 goto out;
438
439 error = nfsd_create_serv();
440 if (error)
441 goto out;
442
443 nfsd_up_before = nfsd_up;
444
445 error = nfsd_startup(port, nrservs);
446 if (error)
447 goto out_destroy;
448 error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
449 if (error)
450 goto out_shutdown;
451 /* We are holding a reference to nfsd_serv which
452 * we don't want to count in the return value,
453 * so subtract 1
454 */
455 error = nfsd_serv->sv_nrthreads - 1;
456out_shutdown:
457 if (error < 0 && !nfsd_up_before)
458 nfsd_shutdown();
459out_destroy:
460 svc_destroy(nfsd_serv); /* Release server */
461out:
462 mutex_unlock(&nfsd_mutex);
463 return error;
464}
465
466
467/*
468 * This is the NFS server kernel thread
469 */
470static int
471nfsd(void *vrqstp)
472{
473 struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
474 int err, preverr = 0;
475
476 /* Lock module and set up kernel thread */
477 mutex_lock(&nfsd_mutex);
478
479 /* At this point, the thread shares current->fs
480 * with the init process. We need to create files with a
481 * umask of 0 instead of init's umask. */
482 if (unshare_fs_struct() < 0) {
483 printk("Unable to start nfsd thread: out of memory\n");
484 goto out;
485 }
486
487 current->fs->umask = 0;
488
489 /*
490 * thread is spawned with all signals set to SIG_IGN, re-enable
491 * the ones that will bring down the thread
492 */
493 allow_signal(SIGKILL);
494 allow_signal(SIGHUP);
495 allow_signal(SIGINT);
496 allow_signal(SIGQUIT);
497
498 nfsdstats.th_cnt++;
499 mutex_unlock(&nfsd_mutex);
500
501 /*
502 * We want less throttling in balance_dirty_pages() so that nfs to
503 * localhost doesn't cause nfsd to lock up due to all the client's
504 * dirty pages.
505 */
506 current->flags |= PF_LESS_THROTTLE;
507 set_freezable();
508
509 /*
510 * The main request loop
511 */
512 for (;;) {
513 /*
514 * Find a socket with data available and call its
515 * recvfrom routine.
516 */
517 while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
518 ;
519 if (err == -EINTR)
520 break;
521 else if (err < 0) {
522 if (err != preverr) {
523 printk(KERN_WARNING "%s: unexpected error "
524 "from svc_recv (%d)\n", __func__, -err);
525 preverr = err;
526 }
527 schedule_timeout_uninterruptible(HZ);
528 continue;
529 }
530
531 validate_process_creds();
532 svc_process(rqstp);
533 validate_process_creds();
534 }
535
536 /* Clear signals before calling svc_exit_thread() */
537 flush_signals(current);
538
539 mutex_lock(&nfsd_mutex);
540 nfsdstats.th_cnt --;
541
542out:
543 /* Release the thread */
544 svc_exit_thread(rqstp);
545
546 /* Release module */
547 mutex_unlock(&nfsd_mutex);
548 module_put_and_exit(0);
549 return 0;
550}
551
552static __be32 map_new_errors(u32 vers, __be32 nfserr)
553{
554 if (nfserr == nfserr_jukebox && vers == 2)
555 return nfserr_dropit;
556 if (nfserr == nfserr_wrongsec && vers < 4)
557 return nfserr_acces;
558 return nfserr;
559}
560
561int
562nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
563{
564 struct svc_procedure *proc;
565 kxdrproc_t xdr;
566 __be32 nfserr;
567 __be32 *nfserrp;
568
569 dprintk("nfsd_dispatch: vers %d proc %d\n",
570 rqstp->rq_vers, rqstp->rq_proc);
571 proc = rqstp->rq_procinfo;
572
573 /*
574 * Give the xdr decoder a chance to change this if it wants
575 * (necessary in the NFSv4.0 compound case)
576 */
577 rqstp->rq_cachetype = proc->pc_cachetype;
578 /* Decode arguments */
579 xdr = proc->pc_decode;
580 if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base,
581 rqstp->rq_argp)) {
582 dprintk("nfsd: failed to decode arguments!\n");
583 *statp = rpc_garbage_args;
584 return 1;
585 }
586
587 /* Check whether we have this call in the cache. */
588 switch (nfsd_cache_lookup(rqstp)) {
589 case RC_INTR:
590 case RC_DROPIT:
591 return 0;
592 case RC_REPLY:
593 return 1;
594 case RC_DOIT:;
595 /* do it */
596 }
597
598 /* need to grab the location to store the status, as
599 * nfsv4 does some encoding while processing
600 */
601 nfserrp = rqstp->rq_res.head[0].iov_base
602 + rqstp->rq_res.head[0].iov_len;
603 rqstp->rq_res.head[0].iov_len += sizeof(__be32);
604
605 /* Now call the procedure handler, and encode NFS status. */
606 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
607 nfserr = map_new_errors(rqstp->rq_vers, nfserr);
608 if (nfserr == nfserr_dropit || rqstp->rq_dropme) {
609 dprintk("nfsd: Dropping request; may be revisited later\n");
610 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
611 return 0;
612 }
613
614 if (rqstp->rq_proc != 0)
615 *nfserrp++ = nfserr;
616
617 /* Encode result.
618 * For NFSv2, additional info is never returned in case of an error.
619 */
620 if (!(nfserr && rqstp->rq_vers == 2)) {
621 xdr = proc->pc_encode;
622 if (xdr && !xdr(rqstp, nfserrp,
623 rqstp->rq_resp)) {
624 /* Failed to encode result. Release cache entry */
625 dprintk("nfsd: failed to encode result!\n");
626 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
627 *statp = rpc_system_err;
628 return 1;
629 }
630 }
631
632 /* Store reply in cache. */
633 nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);
634 return 1;
635}
636
637int nfsd_pool_stats_open(struct inode *inode, struct file *file)
638{
639 int ret;
640 mutex_lock(&nfsd_mutex);
641 if (nfsd_serv == NULL) {
642 mutex_unlock(&nfsd_mutex);
643 return -ENODEV;
644 }
645 /* bump up the psudo refcount while traversing */
646 svc_get(nfsd_serv);
647 ret = svc_pool_stats_open(nfsd_serv, file);
648 mutex_unlock(&nfsd_mutex);
649 return ret;
650}
651
652int nfsd_pool_stats_release(struct inode *inode, struct file *file)
653{
654 int ret = seq_release(inode, file);
655 mutex_lock(&nfsd_mutex);
656 /* this function really, really should have been called svc_put() */
657 svc_destroy(nfsd_serv);
658 mutex_unlock(&nfsd_mutex);
659 return ret;
660}
1/*
2 * Central processing for nfsd.
3 *
4 * Authors: Olaf Kirch (okir@monad.swb.de)
5 *
6 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
7 */
8
9#include <linux/sched.h>
10#include <linux/freezer.h>
11#include <linux/module.h>
12#include <linux/fs_struct.h>
13#include <linux/swap.h>
14
15#include <linux/sunrpc/stats.h>
16#include <linux/sunrpc/svcsock.h>
17#include <linux/sunrpc/svc_xprt.h>
18#include <linux/lockd/bind.h>
19#include <linux/nfsacl.h>
20#include <linux/seq_file.h>
21#include <linux/inetdevice.h>
22#include <net/addrconf.h>
23#include <net/ipv6.h>
24#include <net/net_namespace.h>
25#include "nfsd.h"
26#include "cache.h"
27#include "vfs.h"
28#include "netns.h"
29
30#define NFSDDBG_FACILITY NFSDDBG_SVC
31
32extern struct svc_program nfsd_program;
33static int nfsd(void *vrqstp);
34
35/*
36 * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and the members
37 * of the svc_serv struct. In particular, ->sv_nrthreads but also to some
38 * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
39 *
40 * If (out side the lock) nn->nfsd_serv is non-NULL, then it must point to a
41 * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number
42 * of nfsd threads must exist and each must listed in ->sp_all_threads in each
43 * entry of ->sv_pools[].
44 *
45 * Transitions of the thread count between zero and non-zero are of particular
46 * interest since the svc_serv needs to be created and initialized at that
47 * point, or freed.
48 *
49 * Finally, the nfsd_mutex also protects some of the global variables that are
50 * accessed when nfsd starts and that are settable via the write_* routines in
51 * nfsctl.c. In particular:
52 *
53 * user_recovery_dirname
54 * user_lease_time
55 * nfsd_versions
56 */
57DEFINE_MUTEX(nfsd_mutex);
58
59/*
60 * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
61 * nfsd_drc_max_pages limits the total amount of memory available for
62 * version 4.1 DRC caches.
63 * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
64 */
65spinlock_t nfsd_drc_lock;
66unsigned long nfsd_drc_max_mem;
67unsigned long nfsd_drc_mem_used;
68
69#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
70static struct svc_stat nfsd_acl_svcstats;
71static struct svc_version * nfsd_acl_version[] = {
72 [2] = &nfsd_acl_version2,
73 [3] = &nfsd_acl_version3,
74};
75
76#define NFSD_ACL_MINVERS 2
77#define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
78static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
79
80static struct svc_program nfsd_acl_program = {
81 .pg_prog = NFS_ACL_PROGRAM,
82 .pg_nvers = NFSD_ACL_NRVERS,
83 .pg_vers = nfsd_acl_versions,
84 .pg_name = "nfsacl",
85 .pg_class = "nfsd",
86 .pg_stats = &nfsd_acl_svcstats,
87 .pg_authenticate = &svc_set_client,
88};
89
90static struct svc_stat nfsd_acl_svcstats = {
91 .program = &nfsd_acl_program,
92};
93#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
94
95static struct svc_version * nfsd_version[] = {
96 [2] = &nfsd_version2,
97#if defined(CONFIG_NFSD_V3)
98 [3] = &nfsd_version3,
99#endif
100#if defined(CONFIG_NFSD_V4)
101 [4] = &nfsd_version4,
102#endif
103};
104
105#define NFSD_MINVERS 2
106#define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
107static struct svc_version *nfsd_versions[NFSD_NRVERS];
108
109struct svc_program nfsd_program = {
110#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
111 .pg_next = &nfsd_acl_program,
112#endif
113 .pg_prog = NFS_PROGRAM, /* program number */
114 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
115 .pg_vers = nfsd_versions, /* version table */
116 .pg_name = "nfsd", /* program name */
117 .pg_class = "nfsd", /* authentication class */
118 .pg_stats = &nfsd_svcstats, /* version table */
119 .pg_authenticate = &svc_set_client, /* export authentication */
120
121};
122
123static bool nfsd_supported_minorversions[NFSD_SUPPORTED_MINOR_VERSION + 1] = {
124 [0] = 1,
125 [1] = 1,
126 [2] = 1,
127};
128
129int nfsd_vers(int vers, enum vers_op change)
130{
131 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
132 return 0;
133 switch(change) {
134 case NFSD_SET:
135 nfsd_versions[vers] = nfsd_version[vers];
136#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
137 if (vers < NFSD_ACL_NRVERS)
138 nfsd_acl_versions[vers] = nfsd_acl_version[vers];
139#endif
140 break;
141 case NFSD_CLEAR:
142 nfsd_versions[vers] = NULL;
143#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
144 if (vers < NFSD_ACL_NRVERS)
145 nfsd_acl_versions[vers] = NULL;
146#endif
147 break;
148 case NFSD_TEST:
149 return nfsd_versions[vers] != NULL;
150 case NFSD_AVAIL:
151 return nfsd_version[vers] != NULL;
152 }
153 return 0;
154}
155
156int nfsd_minorversion(u32 minorversion, enum vers_op change)
157{
158 if (minorversion > NFSD_SUPPORTED_MINOR_VERSION)
159 return -1;
160 switch(change) {
161 case NFSD_SET:
162 nfsd_supported_minorversions[minorversion] = true;
163 break;
164 case NFSD_CLEAR:
165 nfsd_supported_minorversions[minorversion] = false;
166 break;
167 case NFSD_TEST:
168 return nfsd_supported_minorversions[minorversion];
169 case NFSD_AVAIL:
170 return minorversion <= NFSD_SUPPORTED_MINOR_VERSION;
171 }
172 return 0;
173}
174
175/*
176 * Maximum number of nfsd processes
177 */
178#define NFSD_MAXSERVS 8192
179
180int nfsd_nrthreads(struct net *net)
181{
182 int rv = 0;
183 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
184
185 mutex_lock(&nfsd_mutex);
186 if (nn->nfsd_serv)
187 rv = nn->nfsd_serv->sv_nrthreads;
188 mutex_unlock(&nfsd_mutex);
189 return rv;
190}
191
192static int nfsd_init_socks(struct net *net)
193{
194 int error;
195 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
196
197 if (!list_empty(&nn->nfsd_serv->sv_permsocks))
198 return 0;
199
200 error = svc_create_xprt(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT,
201 SVC_SOCK_DEFAULTS);
202 if (error < 0)
203 return error;
204
205 error = svc_create_xprt(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT,
206 SVC_SOCK_DEFAULTS);
207 if (error < 0)
208 return error;
209
210 return 0;
211}
212
213static int nfsd_users = 0;
214
215static int nfsd_startup_generic(int nrservs)
216{
217 int ret;
218
219 if (nfsd_users++)
220 return 0;
221
222 /*
223 * Readahead param cache - will no-op if it already exists.
224 * (Note therefore results will be suboptimal if number of
225 * threads is modified after nfsd start.)
226 */
227 ret = nfsd_racache_init(2*nrservs);
228 if (ret)
229 goto dec_users;
230
231 ret = nfs4_state_start();
232 if (ret)
233 goto out_racache;
234 return 0;
235
236out_racache:
237 nfsd_racache_shutdown();
238dec_users:
239 nfsd_users--;
240 return ret;
241}
242
243static void nfsd_shutdown_generic(void)
244{
245 if (--nfsd_users)
246 return;
247
248 nfs4_state_shutdown();
249 nfsd_racache_shutdown();
250}
251
252static bool nfsd_needs_lockd(void)
253{
254#if defined(CONFIG_NFSD_V3)
255 return (nfsd_versions[2] != NULL) || (nfsd_versions[3] != NULL);
256#else
257 return (nfsd_versions[2] != NULL);
258#endif
259}
260
261static int nfsd_startup_net(int nrservs, struct net *net)
262{
263 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
264 int ret;
265
266 if (nn->nfsd_net_up)
267 return 0;
268
269 ret = nfsd_startup_generic(nrservs);
270 if (ret)
271 return ret;
272 ret = nfsd_init_socks(net);
273 if (ret)
274 goto out_socks;
275
276 if (nfsd_needs_lockd() && !nn->lockd_up) {
277 ret = lockd_up(net);
278 if (ret)
279 goto out_socks;
280 nn->lockd_up = 1;
281 }
282
283 ret = nfs4_state_start_net(net);
284 if (ret)
285 goto out_lockd;
286
287 nn->nfsd_net_up = true;
288 return 0;
289
290out_lockd:
291 if (nn->lockd_up) {
292 lockd_down(net);
293 nn->lockd_up = 0;
294 }
295out_socks:
296 nfsd_shutdown_generic();
297 return ret;
298}
299
300static void nfsd_shutdown_net(struct net *net)
301{
302 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
303
304 nfs4_state_shutdown_net(net);
305 if (nn->lockd_up) {
306 lockd_down(net);
307 nn->lockd_up = 0;
308 }
309 nn->nfsd_net_up = false;
310 nfsd_shutdown_generic();
311}
312
313static int nfsd_inetaddr_event(struct notifier_block *this, unsigned long event,
314 void *ptr)
315{
316 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
317 struct net_device *dev = ifa->ifa_dev->dev;
318 struct net *net = dev_net(dev);
319 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
320 struct sockaddr_in sin;
321
322 if (event != NETDEV_DOWN)
323 goto out;
324
325 if (nn->nfsd_serv) {
326 dprintk("nfsd_inetaddr_event: removed %pI4\n", &ifa->ifa_local);
327 sin.sin_family = AF_INET;
328 sin.sin_addr.s_addr = ifa->ifa_local;
329 svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin);
330 }
331
332out:
333 return NOTIFY_DONE;
334}
335
336static struct notifier_block nfsd_inetaddr_notifier = {
337 .notifier_call = nfsd_inetaddr_event,
338};
339
340#if IS_ENABLED(CONFIG_IPV6)
341static int nfsd_inet6addr_event(struct notifier_block *this,
342 unsigned long event, void *ptr)
343{
344 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
345 struct net_device *dev = ifa->idev->dev;
346 struct net *net = dev_net(dev);
347 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
348 struct sockaddr_in6 sin6;
349
350 if (event != NETDEV_DOWN)
351 goto out;
352
353 if (nn->nfsd_serv) {
354 dprintk("nfsd_inet6addr_event: removed %pI6\n", &ifa->addr);
355 sin6.sin6_family = AF_INET6;
356 sin6.sin6_addr = ifa->addr;
357 svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin6);
358 }
359
360out:
361 return NOTIFY_DONE;
362}
363
364static struct notifier_block nfsd_inet6addr_notifier = {
365 .notifier_call = nfsd_inet6addr_event,
366};
367#endif
368
369static void nfsd_last_thread(struct svc_serv *serv, struct net *net)
370{
371 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
372
373 unregister_inetaddr_notifier(&nfsd_inetaddr_notifier);
374#if IS_ENABLED(CONFIG_IPV6)
375 unregister_inet6addr_notifier(&nfsd_inet6addr_notifier);
376#endif
377 /*
378 * write_ports can create the server without actually starting
379 * any threads--if we get shut down before any threads are
380 * started, then nfsd_last_thread will be run before any of this
381 * other initialization has been done except the rpcb information.
382 */
383 svc_rpcb_cleanup(serv, net);
384 if (!nn->nfsd_net_up)
385 return;
386
387 nfsd_shutdown_net(net);
388 printk(KERN_WARNING "nfsd: last server has exited, flushing export "
389 "cache\n");
390 nfsd_export_flush(net);
391}
392
393void nfsd_reset_versions(void)
394{
395 int found_one = 0;
396 int i;
397
398 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
399 if (nfsd_program.pg_vers[i])
400 found_one = 1;
401 }
402
403 if (!found_one) {
404 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
405 nfsd_program.pg_vers[i] = nfsd_version[i];
406#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
407 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
408 nfsd_acl_program.pg_vers[i] =
409 nfsd_acl_version[i];
410#endif
411 }
412}
413
414/*
415 * Each session guarantees a negotiated per slot memory cache for replies
416 * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
417 * NFSv4.1 server might want to use more memory for a DRC than a machine
418 * with mutiple services.
419 *
420 * Impose a hard limit on the number of pages for the DRC which varies
421 * according to the machines free pages. This is of course only a default.
422 *
423 * For now this is a #defined shift which could be under admin control
424 * in the future.
425 */
426static void set_max_drc(void)
427{
428 #define NFSD_DRC_SIZE_SHIFT 10
429 nfsd_drc_max_mem = (nr_free_buffer_pages()
430 >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
431 nfsd_drc_mem_used = 0;
432 spin_lock_init(&nfsd_drc_lock);
433 dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem);
434}
435
436static int nfsd_get_default_max_blksize(void)
437{
438 struct sysinfo i;
439 unsigned long long target;
440 unsigned long ret;
441
442 si_meminfo(&i);
443 target = (i.totalram - i.totalhigh) << PAGE_SHIFT;
444 /*
445 * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig
446 * machines, but only uses 32K on 128M machines. Bottom out at
447 * 8K on 32M and smaller. Of course, this is only a default.
448 */
449 target >>= 12;
450
451 ret = NFSSVC_MAXBLKSIZE;
452 while (ret > target && ret >= 8*1024*2)
453 ret /= 2;
454 return ret;
455}
456
457static struct svc_serv_ops nfsd_thread_sv_ops = {
458 .svo_shutdown = nfsd_last_thread,
459 .svo_function = nfsd,
460 .svo_enqueue_xprt = svc_xprt_do_enqueue,
461 .svo_setup = svc_set_num_threads,
462 .svo_module = THIS_MODULE,
463};
464
465int nfsd_create_serv(struct net *net)
466{
467 int error;
468 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
469
470 WARN_ON(!mutex_is_locked(&nfsd_mutex));
471 if (nn->nfsd_serv) {
472 svc_get(nn->nfsd_serv);
473 return 0;
474 }
475 if (nfsd_max_blksize == 0)
476 nfsd_max_blksize = nfsd_get_default_max_blksize();
477 nfsd_reset_versions();
478 nn->nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
479 &nfsd_thread_sv_ops);
480 if (nn->nfsd_serv == NULL)
481 return -ENOMEM;
482
483 nn->nfsd_serv->sv_maxconn = nn->max_connections;
484 error = svc_bind(nn->nfsd_serv, net);
485 if (error < 0) {
486 svc_destroy(nn->nfsd_serv);
487 return error;
488 }
489
490 set_max_drc();
491 register_inetaddr_notifier(&nfsd_inetaddr_notifier);
492#if IS_ENABLED(CONFIG_IPV6)
493 register_inet6addr_notifier(&nfsd_inet6addr_notifier);
494#endif
495 do_gettimeofday(&nn->nfssvc_boot); /* record boot time */
496 return 0;
497}
498
499int nfsd_nrpools(struct net *net)
500{
501 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
502
503 if (nn->nfsd_serv == NULL)
504 return 0;
505 else
506 return nn->nfsd_serv->sv_nrpools;
507}
508
509int nfsd_get_nrthreads(int n, int *nthreads, struct net *net)
510{
511 int i = 0;
512 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
513
514 if (nn->nfsd_serv != NULL) {
515 for (i = 0; i < nn->nfsd_serv->sv_nrpools && i < n; i++)
516 nthreads[i] = nn->nfsd_serv->sv_pools[i].sp_nrthreads;
517 }
518
519 return 0;
520}
521
522void nfsd_destroy(struct net *net)
523{
524 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
525 int destroy = (nn->nfsd_serv->sv_nrthreads == 1);
526
527 if (destroy)
528 svc_shutdown_net(nn->nfsd_serv, net);
529 svc_destroy(nn->nfsd_serv);
530 if (destroy)
531 nn->nfsd_serv = NULL;
532}
533
534int nfsd_set_nrthreads(int n, int *nthreads, struct net *net)
535{
536 int i = 0;
537 int tot = 0;
538 int err = 0;
539 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
540
541 WARN_ON(!mutex_is_locked(&nfsd_mutex));
542
543 if (nn->nfsd_serv == NULL || n <= 0)
544 return 0;
545
546 if (n > nn->nfsd_serv->sv_nrpools)
547 n = nn->nfsd_serv->sv_nrpools;
548
549 /* enforce a global maximum number of threads */
550 tot = 0;
551 for (i = 0; i < n; i++) {
552 nthreads[i] = min(nthreads[i], NFSD_MAXSERVS);
553 tot += nthreads[i];
554 }
555 if (tot > NFSD_MAXSERVS) {
556 /* total too large: scale down requested numbers */
557 for (i = 0; i < n && tot > 0; i++) {
558 int new = nthreads[i] * NFSD_MAXSERVS / tot;
559 tot -= (nthreads[i] - new);
560 nthreads[i] = new;
561 }
562 for (i = 0; i < n && tot > 0; i++) {
563 nthreads[i]--;
564 tot--;
565 }
566 }
567
568 /*
569 * There must always be a thread in pool 0; the admin
570 * can't shut down NFS completely using pool_threads.
571 */
572 if (nthreads[0] == 0)
573 nthreads[0] = 1;
574
575 /* apply the new numbers */
576 svc_get(nn->nfsd_serv);
577 for (i = 0; i < n; i++) {
578 err = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv,
579 &nn->nfsd_serv->sv_pools[i], nthreads[i]);
580 if (err)
581 break;
582 }
583 nfsd_destroy(net);
584 return err;
585}
586
587/*
588 * Adjust the number of threads and return the new number of threads.
589 * This is also the function that starts the server if necessary, if
590 * this is the first time nrservs is nonzero.
591 */
592int
593nfsd_svc(int nrservs, struct net *net)
594{
595 int error;
596 bool nfsd_up_before;
597 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
598
599 mutex_lock(&nfsd_mutex);
600 dprintk("nfsd: creating service\n");
601
602 nrservs = max(nrservs, 0);
603 nrservs = min(nrservs, NFSD_MAXSERVS);
604 error = 0;
605
606 if (nrservs == 0 && nn->nfsd_serv == NULL)
607 goto out;
608
609 error = nfsd_create_serv(net);
610 if (error)
611 goto out;
612
613 nfsd_up_before = nn->nfsd_net_up;
614
615 error = nfsd_startup_net(nrservs, net);
616 if (error)
617 goto out_destroy;
618 error = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv,
619 NULL, nrservs);
620 if (error)
621 goto out_shutdown;
622 /* We are holding a reference to nn->nfsd_serv which
623 * we don't want to count in the return value,
624 * so subtract 1
625 */
626 error = nn->nfsd_serv->sv_nrthreads - 1;
627out_shutdown:
628 if (error < 0 && !nfsd_up_before)
629 nfsd_shutdown_net(net);
630out_destroy:
631 nfsd_destroy(net); /* Release server */
632out:
633 mutex_unlock(&nfsd_mutex);
634 return error;
635}
636
637
638/*
639 * This is the NFS server kernel thread
640 */
641static int
642nfsd(void *vrqstp)
643{
644 struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
645 struct svc_xprt *perm_sock = list_entry(rqstp->rq_server->sv_permsocks.next, typeof(struct svc_xprt), xpt_list);
646 struct net *net = perm_sock->xpt_net;
647 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
648 int err;
649
650 /* Lock module and set up kernel thread */
651 mutex_lock(&nfsd_mutex);
652
653 /* At this point, the thread shares current->fs
654 * with the init process. We need to create files with a
655 * umask of 0 instead of init's umask. */
656 if (unshare_fs_struct() < 0) {
657 printk("Unable to start nfsd thread: out of memory\n");
658 goto out;
659 }
660
661 current->fs->umask = 0;
662
663 /*
664 * thread is spawned with all signals set to SIG_IGN, re-enable
665 * the ones that will bring down the thread
666 */
667 allow_signal(SIGKILL);
668 allow_signal(SIGHUP);
669 allow_signal(SIGINT);
670 allow_signal(SIGQUIT);
671
672 nfsdstats.th_cnt++;
673 mutex_unlock(&nfsd_mutex);
674
675 set_freezable();
676
677 /*
678 * The main request loop
679 */
680 for (;;) {
681 /* Update sv_maxconn if it has changed */
682 rqstp->rq_server->sv_maxconn = nn->max_connections;
683
684 /*
685 * Find a socket with data available and call its
686 * recvfrom routine.
687 */
688 while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
689 ;
690 if (err == -EINTR)
691 break;
692 validate_process_creds();
693 svc_process(rqstp);
694 validate_process_creds();
695 }
696
697 /* Clear signals before calling svc_exit_thread() */
698 flush_signals(current);
699
700 mutex_lock(&nfsd_mutex);
701 nfsdstats.th_cnt --;
702
703out:
704 rqstp->rq_server = NULL;
705
706 /* Release the thread */
707 svc_exit_thread(rqstp);
708
709 nfsd_destroy(net);
710
711 /* Release module */
712 mutex_unlock(&nfsd_mutex);
713 module_put_and_exit(0);
714 return 0;
715}
716
717static __be32 map_new_errors(u32 vers, __be32 nfserr)
718{
719 if (nfserr == nfserr_jukebox && vers == 2)
720 return nfserr_dropit;
721 if (nfserr == nfserr_wrongsec && vers < 4)
722 return nfserr_acces;
723 return nfserr;
724}
725
726int
727nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
728{
729 struct svc_procedure *proc;
730 kxdrproc_t xdr;
731 __be32 nfserr;
732 __be32 *nfserrp;
733
734 dprintk("nfsd_dispatch: vers %d proc %d\n",
735 rqstp->rq_vers, rqstp->rq_proc);
736 proc = rqstp->rq_procinfo;
737
738 /*
739 * Give the xdr decoder a chance to change this if it wants
740 * (necessary in the NFSv4.0 compound case)
741 */
742 rqstp->rq_cachetype = proc->pc_cachetype;
743 /* Decode arguments */
744 xdr = proc->pc_decode;
745 if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base,
746 rqstp->rq_argp)) {
747 dprintk("nfsd: failed to decode arguments!\n");
748 *statp = rpc_garbage_args;
749 return 1;
750 }
751
752 /* Check whether we have this call in the cache. */
753 switch (nfsd_cache_lookup(rqstp)) {
754 case RC_DROPIT:
755 return 0;
756 case RC_REPLY:
757 return 1;
758 case RC_DOIT:;
759 /* do it */
760 }
761
762 /* need to grab the location to store the status, as
763 * nfsv4 does some encoding while processing
764 */
765 nfserrp = rqstp->rq_res.head[0].iov_base
766 + rqstp->rq_res.head[0].iov_len;
767 rqstp->rq_res.head[0].iov_len += sizeof(__be32);
768
769 /* Now call the procedure handler, and encode NFS status. */
770 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
771 nfserr = map_new_errors(rqstp->rq_vers, nfserr);
772 if (nfserr == nfserr_dropit || test_bit(RQ_DROPME, &rqstp->rq_flags)) {
773 dprintk("nfsd: Dropping request; may be revisited later\n");
774 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
775 return 0;
776 }
777
778 if (rqstp->rq_proc != 0)
779 *nfserrp++ = nfserr;
780
781 /* Encode result.
782 * For NFSv2, additional info is never returned in case of an error.
783 */
784 if (!(nfserr && rqstp->rq_vers == 2)) {
785 xdr = proc->pc_encode;
786 if (xdr && !xdr(rqstp, nfserrp,
787 rqstp->rq_resp)) {
788 /* Failed to encode result. Release cache entry */
789 dprintk("nfsd: failed to encode result!\n");
790 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
791 *statp = rpc_system_err;
792 return 1;
793 }
794 }
795
796 /* Store reply in cache. */
797 nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1);
798 return 1;
799}
800
801int nfsd_pool_stats_open(struct inode *inode, struct file *file)
802{
803 int ret;
804 struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
805
806 mutex_lock(&nfsd_mutex);
807 if (nn->nfsd_serv == NULL) {
808 mutex_unlock(&nfsd_mutex);
809 return -ENODEV;
810 }
811 /* bump up the psudo refcount while traversing */
812 svc_get(nn->nfsd_serv);
813 ret = svc_pool_stats_open(nn->nfsd_serv, file);
814 mutex_unlock(&nfsd_mutex);
815 return ret;
816}
817
818int nfsd_pool_stats_release(struct inode *inode, struct file *file)
819{
820 int ret = seq_release(inode, file);
821 struct net *net = inode->i_sb->s_fs_info;
822
823 mutex_lock(&nfsd_mutex);
824 /* this function really, really should have been called svc_put() */
825 nfsd_destroy(net);
826 mutex_unlock(&nfsd_mutex);
827 return ret;
828}