2 * linux/fs/nfsd/nfssvc.c
4 * Central processing for nfsd.
6 * Authors: Olaf Kirch (okir@monad.swb.de)
8 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
11 #include <linux/module.h>
13 #include <linux/time.h>
14 #include <linux/errno.h>
15 #include <linux/nfs.h>
17 #include <linux/uio.h>
18 #include <linux/unistd.h>
19 #include <linux/slab.h>
20 #include <linux/smp.h>
21 #include <linux/smp_lock.h>
22 #include <linux/fs_struct.h>
24 #include <linux/sunrpc/types.h>
25 #include <linux/sunrpc/stats.h>
26 #include <linux/sunrpc/svc.h>
27 #include <linux/sunrpc/svcsock.h>
28 #include <linux/sunrpc/cache.h>
29 #include <linux/nfsd/nfsd.h>
30 #include <linux/nfsd/stats.h>
31 #include <linux/nfsd/cache.h>
32 #include <linux/nfsd/syscall.h>
33 #include <linux/lockd/bind.h>
34 #include <linux/nfsacl.h>
36 #define NFSDDBG_FACILITY NFSDDBG_SVC
38 /* these signals will be delivered to an nfsd thread
39 * when handling a request
41 #define ALLOWED_SIGS (sigmask(SIGKILL))
42 /* these signals will be delivered to an nfsd thread
43 * when not handling a request. i.e. when waiting
45 #define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT))
46 /* if the last thread dies with SIGHUP, then the exports table is
47 * left unchanged ( like 2.4-{0-9} ). Any other signal will clear
48 * the exports table (like 2.2).
50 #define SIG_NOCLEAN SIGHUP
52 extern struct svc_program nfsd_program;
53 static void nfsd(struct svc_rqst *rqstp);
54 struct timeval nfssvc_boot;
55 struct svc_serv *nfsd_serv;
56 static atomic_t nfsd_busy;
57 static unsigned long nfsd_last_call;
58 static DEFINE_SPINLOCK(nfsd_call_lock);
60 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
61 static struct svc_stat nfsd_acl_svcstats;
62 static struct svc_version * nfsd_acl_version[] = {
63 [2] = &nfsd_acl_version2,
64 [3] = &nfsd_acl_version3,
67 #define NFSD_ACL_MINVERS 2
68 #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
69 static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
71 static struct svc_program nfsd_acl_program = {
72 .pg_prog = NFS_ACL_PROGRAM,
73 .pg_nvers = NFSD_ACL_NRVERS,
74 .pg_vers = nfsd_acl_versions,
77 .pg_stats = &nfsd_acl_svcstats,
78 .pg_authenticate = &svc_set_client,
81 static struct svc_stat nfsd_acl_svcstats = {
82 .program = &nfsd_acl_program,
84 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
86 static struct svc_version * nfsd_version[] = {
88 #if defined(CONFIG_NFSD_V3)
91 #if defined(CONFIG_NFSD_V4)
96 #define NFSD_MINVERS 2
97 #define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
98 static struct svc_version *nfsd_versions[NFSD_NRVERS];
100 struct svc_program nfsd_program = {
101 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
102 .pg_next = &nfsd_acl_program,
104 .pg_prog = NFS_PROGRAM, /* program number */
105 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
106 .pg_vers = nfsd_versions, /* version table */
107 .pg_name = "nfsd", /* program name */
108 .pg_class = "nfsd", /* authentication class */
109 .pg_stats = &nfsd_svcstats, /* version table */
110 .pg_authenticate = &svc_set_client, /* export authentication */
114 int nfsd_vers(int vers, enum vers_op change)
116 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
120 nfsd_versions[vers] = nfsd_version[vers];
122 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
123 if (vers < NFSD_ACL_NRVERS)
124 nfsd_acl_version[vers] = nfsd_acl_version[vers];
127 nfsd_versions[vers] = NULL;
128 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
129 if (vers < NFSD_ACL_NRVERS)
130 nfsd_acl_version[vers] = NULL;
134 return nfsd_versions[vers] != NULL;
136 return nfsd_version[vers] != NULL;
141 * Maximum number of nfsd processes
143 #define NFSD_MAXSERVS 8192
145 int nfsd_nrthreads(void)
147 if (nfsd_serv == NULL)
150 return nfsd_serv->sv_nrthreads;
153 static int killsig; /* signal that was used to kill last nfsd */
154 static void nfsd_last_thread(struct svc_serv *serv)
156 /* When last nfsd thread exits we need to do some clean-up */
157 struct svc_sock *svsk;
158 list_for_each_entry(svsk, &serv->sv_permsocks, sk_list)
161 nfsd_racache_shutdown();
162 nfs4_state_shutdown();
164 printk(KERN_WARNING "nfsd: last server has exited\n");
165 if (killsig != SIG_NOCLEAN) {
166 printk(KERN_WARNING "nfsd: unexporting all filesystems\n");
171 void nfsd_reset_versions(void)
176 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
177 if (nfsd_program.pg_vers[i])
182 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
183 nfsd_program.pg_vers[i] = nfsd_version[i];
184 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
185 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
186 nfsd_acl_program.pg_vers[i] =
192 int nfsd_create_serv(void)
202 atomic_set(&nfsd_busy, 0);
203 nfsd_serv = svc_create_pooled(&nfsd_program, NFSD_BUFSIZE,
205 nfsd, SIG_NOCLEAN, THIS_MODULE);
206 if (nfsd_serv == NULL)
209 do_gettimeofday(&nfssvc_boot); /* record boot time */
213 static int nfsd_init_socks(int port)
216 if (!list_empty(&nfsd_serv->sv_permsocks))
219 error = lockd_up(IPPROTO_UDP);
221 error = svc_makesock(nfsd_serv, IPPROTO_UDP, port);
228 #ifdef CONFIG_NFSD_TCP
229 error = lockd_up(IPPROTO_TCP);
231 error = svc_makesock(nfsd_serv, IPPROTO_TCP, port);
241 int nfsd_nrpools(void)
243 if (nfsd_serv == NULL)
246 return nfsd_serv->sv_nrpools;
249 int nfsd_get_nrthreads(int n, int *nthreads)
253 if (nfsd_serv != NULL) {
254 for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++)
255 nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads;
261 int nfsd_set_nrthreads(int n, int *nthreads)
267 if (nfsd_serv == NULL || n <= 0)
270 if (n > nfsd_serv->sv_nrpools)
271 n = nfsd_serv->sv_nrpools;
273 /* enforce a global maximum number of threads */
275 for (i = 0; i < n; i++) {
276 if (nthreads[i] > NFSD_MAXSERVS)
277 nthreads[i] = NFSD_MAXSERVS;
280 if (tot > NFSD_MAXSERVS) {
281 /* total too large: scale down requested numbers */
282 for (i = 0; i < n && tot > 0; i++) {
283 int new = nthreads[i] * NFSD_MAXSERVS / tot;
284 tot -= (nthreads[i] - new);
287 for (i = 0; i < n && tot > 0; i++) {
294 * There must always be a thread in pool 0; the admin
295 * can't shut down NFS completely using pool_threads.
297 if (nthreads[0] == 0)
300 /* apply the new numbers */
303 for (i = 0; i < n; i++) {
304 err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i],
309 svc_destroy(nfsd_serv);
316 nfsd_svc(unsigned short port, int nrservs)
321 dprintk("nfsd: creating service\n");
325 if (nrservs > NFSD_MAXSERVS)
326 nrservs = NFSD_MAXSERVS;
328 /* Readahead param cache - will no-op if it already exists */
329 error = nfsd_racache_init(2*nrservs);
332 error = nfs4_state_start();
336 nfsd_reset_versions();
338 error = nfsd_create_serv();
342 error = nfsd_init_socks(port);
346 error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
348 svc_destroy(nfsd_serv); /* Release server */
355 update_thread_usage(int busy_threads)
357 unsigned long prev_call;
361 spin_lock(&nfsd_call_lock);
362 prev_call = nfsd_last_call;
363 nfsd_last_call = jiffies;
364 decile = busy_threads*10/nfsdstats.th_cnt;
365 if (decile>0 && decile <= 10) {
366 diff = nfsd_last_call - prev_call;
367 if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP)
368 nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP;
370 nfsdstats.th_fullcnt++;
372 spin_unlock(&nfsd_call_lock);
376 * This is the NFS server kernel thread
379 nfsd(struct svc_rqst *rqstp)
381 struct fs_struct *fsp;
383 sigset_t shutdown_mask, allowed_mask;
385 /* Lock module and set up kernel thread */
389 /* After daemonize() this kernel thread shares current->fs
390 * with the init process. We need to create files with a
391 * umask of 0 instead of init's umask. */
392 fsp = copy_fs_struct(current->fs);
394 printk("Unable to start nfsd thread: out of memory\n");
399 current->fs->umask = 0;
401 siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS);
402 siginitsetinv(&allowed_mask, ALLOWED_SIGS);
406 rqstp->rq_task = current;
411 * We want less throttling in balance_dirty_pages() so that nfs to
412 * localhost doesn't cause nfsd to lock up due to all the client's
415 current->flags |= PF_LESS_THROTTLE;
418 * The main request loop
421 /* Block all but the shutdown signals */
422 sigprocmask(SIG_SETMASK, &shutdown_mask, NULL);
425 * Find a socket with data available and call its
428 while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
432 update_thread_usage(atomic_read(&nfsd_busy));
433 atomic_inc(&nfsd_busy);
435 /* Lock the export hash tables for reading. */
438 /* Process request with signals blocked. */
439 sigprocmask(SIG_SETMASK, &allowed_mask, NULL);
443 /* Unlock export hash tables */
445 update_thread_usage(atomic_read(&nfsd_busy));
446 atomic_dec(&nfsd_busy);
450 printk(KERN_WARNING "nfsd: terminating on error %d\n", -err);
454 for (signo = 1; signo <= _NSIG; signo++)
455 if (sigismember(¤t->pending.signal, signo) &&
456 !sigismember(¤t->blocked, signo))
460 /* Clear signals before calling svc_exit_thread() */
461 flush_signals(current);
468 /* Release the thread */
469 svc_exit_thread(rqstp);
473 module_put_and_exit(0);
477 nfsd_dispatch(struct svc_rqst *rqstp, u32 *statp)
479 struct svc_procedure *proc;
484 dprintk("nfsd_dispatch: vers %d proc %d\n",
485 rqstp->rq_vers, rqstp->rq_proc);
486 proc = rqstp->rq_procinfo;
488 /* Check whether we have this call in the cache. */
489 switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) {
499 /* Decode arguments */
500 xdr = proc->pc_decode;
501 if (xdr && !xdr(rqstp, (u32*)rqstp->rq_arg.head[0].iov_base,
503 dprintk("nfsd: failed to decode arguments!\n");
504 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
505 *statp = rpc_garbage_args;
509 /* need to grab the location to store the status, as
510 * nfsv4 does some encoding while processing
512 nfserrp = rqstp->rq_res.head[0].iov_base
513 + rqstp->rq_res.head[0].iov_len;
514 rqstp->rq_res.head[0].iov_len += sizeof(u32);
516 /* Now call the procedure handler, and encode NFS status. */
517 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
518 if (nfserr == nfserr_jukebox && rqstp->rq_vers == 2)
519 nfserr = nfserr_dropit;
520 if (nfserr == nfserr_dropit) {
521 dprintk("nfsd: Dropping request due to malloc failure!\n");
522 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
526 if (rqstp->rq_proc != 0)
530 * For NFSv2, additional info is never returned in case of an error.
532 if (!(nfserr && rqstp->rq_vers == 2)) {
533 xdr = proc->pc_encode;
534 if (xdr && !xdr(rqstp, nfserrp,
536 /* Failed to encode result. Release cache entry */
537 dprintk("nfsd: failed to encode result!\n");
538 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
539 *statp = rpc_system_err;
544 /* Store reply in cache. */
545 nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);