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);
61 struct list_head list;
62 struct task_struct *task;
64 static struct list_head nfsd_list = LIST_HEAD_INIT(nfsd_list);
66 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
67 static struct svc_stat nfsd_acl_svcstats;
68 static struct svc_version * nfsd_acl_version[] = {
69 [2] = &nfsd_acl_version2,
70 [3] = &nfsd_acl_version3,
73 #define NFSD_ACL_MINVERS 2
74 #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
75 static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
77 static struct svc_program nfsd_acl_program = {
78 .pg_prog = NFS_ACL_PROGRAM,
79 .pg_nvers = NFSD_ACL_NRVERS,
80 .pg_vers = nfsd_acl_versions,
83 .pg_stats = &nfsd_acl_svcstats,
84 .pg_authenticate = &svc_set_client,
87 static struct svc_stat nfsd_acl_svcstats = {
88 .program = &nfsd_acl_program,
90 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
92 static struct svc_version * nfsd_version[] = {
94 #if defined(CONFIG_NFSD_V3)
97 #if defined(CONFIG_NFSD_V4)
102 #define NFSD_MINVERS 2
103 #define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
104 static struct svc_version *nfsd_versions[NFSD_NRVERS];
106 struct svc_program nfsd_program = {
107 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
108 .pg_next = &nfsd_acl_program,
110 .pg_prog = NFS_PROGRAM, /* program number */
111 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
112 .pg_vers = nfsd_versions, /* version table */
113 .pg_name = "nfsd", /* program name */
114 .pg_class = "nfsd", /* authentication class */
115 .pg_stats = &nfsd_svcstats, /* version table */
116 .pg_authenticate = &svc_set_client, /* export authentication */
120 int nfsd_vers(int vers, enum vers_op change)
122 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
126 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_version[vers] = nfsd_acl_version[vers];
133 nfsd_versions[vers] = NULL;
134 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
135 if (vers < NFSD_ACL_NRVERS)
136 nfsd_acl_version[vers] = NULL;
140 return nfsd_versions[vers] != NULL;
142 return nfsd_version[vers] != NULL;
147 * Maximum number of nfsd processes
149 #define NFSD_MAXSERVS 8192
151 int nfsd_nrthreads(void)
153 if (nfsd_serv == NULL)
156 return nfsd_serv->sv_nrthreads;
159 static int killsig; /* signal that was used to kill last nfsd */
160 static void nfsd_last_thread(struct svc_serv *serv)
162 /* When last nfsd thread exits we need to do some clean-up */
163 struct svc_sock *svsk;
164 list_for_each_entry(svsk, &serv->sv_permsocks, sk_list)
167 nfsd_racache_shutdown();
168 nfs4_state_shutdown();
170 printk(KERN_WARNING "nfsd: last server has exited\n");
171 if (killsig != SIG_NOCLEAN) {
172 printk(KERN_WARNING "nfsd: unexporting all filesystems\n");
177 void nfsd_reset_versions(void)
182 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
183 if (nfsd_program.pg_vers[i])
188 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
189 nfsd_program.pg_vers[i] = nfsd_version[i];
190 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
191 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
192 nfsd_acl_program.pg_vers[i] =
198 static int nfsd_create_serv(void)
203 nfsd_serv->sv_nrthreads++;
208 atomic_set(&nfsd_busy, 0);
209 nfsd_serv = svc_create(&nfsd_program, NFSD_BUFSIZE,
211 if (nfsd_serv == NULL)
214 nfsd_serv->sv_nrthreads++;
216 do_gettimeofday(&nfssvc_boot); /* record boot time */
220 static int nfsd_init_socks(int port)
223 if (!list_empty(&nfsd_serv->sv_permsocks))
226 error = svc_makesock(nfsd_serv, IPPROTO_UDP, port);
229 error = lockd_up(IPPROTO_UDP);
233 #ifdef CONFIG_NFSD_TCP
234 error = svc_makesock(nfsd_serv, IPPROTO_TCP, port);
237 error = lockd_up(IPPROTO_TCP);
245 nfsd_svc(unsigned short port, int nrservs)
248 struct list_head *victim;
251 dprintk("nfsd: creating service\n");
255 if (nrservs > NFSD_MAXSERVS)
256 nrservs = NFSD_MAXSERVS;
258 /* Readahead param cache - will no-op if it already exists */
259 error = nfsd_racache_init(2*nrservs);
262 error = nfs4_state_start();
266 nfsd_reset_versions();
268 error = nfsd_create_serv();
272 error = nfsd_init_socks(port);
276 nrservs -= (nfsd_serv->sv_nrthreads-1);
277 while (nrservs > 0) {
279 __module_get(THIS_MODULE);
280 error = svc_create_thread(nfsd, nfsd_serv);
282 module_put(THIS_MODULE);
286 victim = nfsd_list.next;
287 while (nrservs < 0 && victim != &nfsd_list) {
288 struct nfsd_list *nl =
289 list_entry(victim,struct nfsd_list, list);
290 victim = victim->next;
291 send_sig(SIG_NOCLEAN, nl->task, 1);
295 svc_destroy(nfsd_serv); /* Release server */
302 update_thread_usage(int busy_threads)
304 unsigned long prev_call;
308 spin_lock(&nfsd_call_lock);
309 prev_call = nfsd_last_call;
310 nfsd_last_call = jiffies;
311 decile = busy_threads*10/nfsdstats.th_cnt;
312 if (decile>0 && decile <= 10) {
313 diff = nfsd_last_call - prev_call;
314 if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP)
315 nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP;
317 nfsdstats.th_fullcnt++;
319 spin_unlock(&nfsd_call_lock);
323 * This is the NFS server kernel thread
326 nfsd(struct svc_rqst *rqstp)
328 struct svc_serv *serv = rqstp->rq_server;
329 struct fs_struct *fsp;
332 sigset_t shutdown_mask, allowed_mask;
334 /* Lock module and set up kernel thread */
338 /* After daemonize() this kernel thread shares current->fs
339 * with the init process. We need to create files with a
340 * umask of 0 instead of init's umask. */
341 fsp = copy_fs_struct(current->fs);
343 printk("Unable to start nfsd thread: out of memory\n");
348 current->fs->umask = 0;
350 siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS);
351 siginitsetinv(&allowed_mask, ALLOWED_SIGS);
356 list_add(&me.list, &nfsd_list);
361 * We want less throttling in balance_dirty_pages() so that nfs to
362 * localhost doesn't cause nfsd to lock up due to all the client's
365 current->flags |= PF_LESS_THROTTLE;
368 * The main request loop
371 /* Block all but the shutdown signals */
372 sigprocmask(SIG_SETMASK, &shutdown_mask, NULL);
375 * Find a socket with data available and call its
378 while ((err = svc_recv(serv, rqstp,
379 60*60*HZ)) == -EAGAIN)
383 update_thread_usage(atomic_read(&nfsd_busy));
384 atomic_inc(&nfsd_busy);
386 /* Lock the export hash tables for reading. */
389 /* Process request with signals blocked. */
390 sigprocmask(SIG_SETMASK, &allowed_mask, NULL);
392 svc_process(serv, rqstp);
394 /* Unlock export hash tables */
396 update_thread_usage(atomic_read(&nfsd_busy));
397 atomic_dec(&nfsd_busy);
401 printk(KERN_WARNING "nfsd: terminating on error %d\n", -err);
405 for (signo = 1; signo <= _NSIG; signo++)
406 if (sigismember(¤t->pending.signal, signo) &&
407 !sigismember(¤t->blocked, signo))
411 /* Clear signals before calling svc_exit_thread() */
412 flush_signals(current);
420 /* Release the thread */
421 svc_exit_thread(rqstp);
425 module_put_and_exit(0);
429 nfsd_dispatch(struct svc_rqst *rqstp, u32 *statp)
431 struct svc_procedure *proc;
436 dprintk("nfsd_dispatch: vers %d proc %d\n",
437 rqstp->rq_vers, rqstp->rq_proc);
438 proc = rqstp->rq_procinfo;
440 /* Check whether we have this call in the cache. */
441 switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) {
451 /* Decode arguments */
452 xdr = proc->pc_decode;
453 if (xdr && !xdr(rqstp, (u32*)rqstp->rq_arg.head[0].iov_base,
455 dprintk("nfsd: failed to decode arguments!\n");
456 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
457 *statp = rpc_garbage_args;
461 /* need to grab the location to store the status, as
462 * nfsv4 does some encoding while processing
464 nfserrp = rqstp->rq_res.head[0].iov_base
465 + rqstp->rq_res.head[0].iov_len;
466 rqstp->rq_res.head[0].iov_len += sizeof(u32);
468 /* Now call the procedure handler, and encode NFS status. */
469 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
470 if (nfserr == nfserr_jukebox && rqstp->rq_vers == 2)
471 nfserr = nfserr_dropit;
472 if (nfserr == nfserr_dropit) {
473 dprintk("nfsd: Dropping request due to malloc failure!\n");
474 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
478 if (rqstp->rq_proc != 0)
482 * For NFSv2, additional info is never returned in case of an error.
484 if (!(nfserr && rqstp->rq_vers == 2)) {
485 xdr = proc->pc_encode;
486 if (xdr && !xdr(rqstp, nfserrp,
488 /* Failed to encode result. Release cache entry */
489 dprintk("nfsd: failed to encode result!\n");
490 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
491 *statp = rpc_system_err;
496 /* Store reply in cache. */
497 nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);