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 extern struct svc_version nfsd_version2, nfsd_version3, nfsd_version4;
94 static struct svc_version * nfsd_version[] = {
96 #if defined(CONFIG_NFSD_V3)
99 #if defined(CONFIG_NFSD_V4)
100 [4] = &nfsd_version4,
104 #define NFSD_MINVERS 2
105 #define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
106 static struct svc_version *nfsd_versions[NFSD_NRVERS];
108 struct svc_program nfsd_program = {
109 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
110 .pg_next = &nfsd_acl_program,
112 .pg_prog = NFS_PROGRAM, /* program number */
113 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
114 .pg_vers = nfsd_versions, /* version table */
115 .pg_name = "nfsd", /* program name */
116 .pg_class = "nfsd", /* authentication class */
117 .pg_stats = &nfsd_svcstats, /* version table */
118 .pg_authenticate = &svc_set_client, /* export authentication */
123 * Maximum number of nfsd processes
125 #define NFSD_MAXSERVS 8192
127 int nfsd_nrthreads(void)
129 if (nfsd_serv == NULL)
132 return nfsd_serv->sv_nrthreads;
136 nfsd_svc(unsigned short port, int nrservs)
139 int none_left, found_one, i;
140 struct list_head *victim;
143 dprintk("nfsd: creating service: port %d vers 0x%x proto 0x%x\n",
144 nfsd_port, nfsd_versbits, nfsd_portbits);
148 if (nrservs > NFSD_MAXSERVS)
149 nrservs = NFSD_MAXSERVS;
151 /* Readahead param cache - will no-op if it already exists */
152 error = nfsd_racache_init(2*nrservs);
155 error = nfs4_state_start();
160 * Use the nfsd_ctlbits to define which
161 * versions that will be advertised.
162 * If nfsd_ctlbits doesn't list any version,
167 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
168 if (NFSCTL_VERISSET(nfsd_versbits, i)) {
169 nfsd_program.pg_vers[i] = nfsd_version[i];
172 nfsd_program.pg_vers[i] = NULL;
176 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
177 nfsd_program.pg_vers[i] = nfsd_version[i];
181 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
184 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) {
185 if (NFSCTL_VERISSET(nfsd_versbits, i)) {
186 nfsd_acl_program.pg_vers[i] =
190 nfsd_acl_program.pg_vers[i] = NULL;
194 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
195 nfsd_acl_program.pg_vers[i] =
200 atomic_set(&nfsd_busy, 0);
202 nfsd_serv = svc_create(&nfsd_program, NFSD_BUFSIZE);
203 if (nfsd_serv == NULL)
205 if (NFSCTL_UDPISSET(nfsd_portbits))
207 error = svc_makesock(nfsd_serv, IPPROTO_UDP, port);
211 #ifdef CONFIG_NFSD_TCP
212 if (NFSCTL_TCPISSET(nfsd_portbits))
214 error = svc_makesock(nfsd_serv, IPPROTO_TCP, port);
218 do_gettimeofday(&nfssvc_boot); /* record boot time */
220 nfsd_serv->sv_nrthreads++;
221 nrservs -= (nfsd_serv->sv_nrthreads-1);
222 while (nrservs > 0) {
224 __module_get(THIS_MODULE);
225 error = svc_create_thread(nfsd, nfsd_serv);
227 module_put(THIS_MODULE);
231 victim = nfsd_list.next;
232 while (nrservs < 0 && victim != &nfsd_list) {
233 struct nfsd_list *nl =
234 list_entry(victim,struct nfsd_list, list);
235 victim = victim->next;
236 send_sig(SIG_NOCLEAN, nl->task, 1);
240 none_left = (nfsd_serv->sv_nrthreads == 1);
241 svc_destroy(nfsd_serv); /* Release server */
244 nfsd_racache_shutdown();
245 nfs4_state_shutdown();
253 update_thread_usage(int busy_threads)
255 unsigned long prev_call;
259 spin_lock(&nfsd_call_lock);
260 prev_call = nfsd_last_call;
261 nfsd_last_call = jiffies;
262 decile = busy_threads*10/nfsdstats.th_cnt;
263 if (decile>0 && decile <= 10) {
264 diff = nfsd_last_call - prev_call;
265 if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP)
266 nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP;
268 nfsdstats.th_fullcnt++;
270 spin_unlock(&nfsd_call_lock);
274 * This is the NFS server kernel thread
277 nfsd(struct svc_rqst *rqstp)
279 struct svc_serv *serv = rqstp->rq_server;
280 struct fs_struct *fsp;
283 sigset_t shutdown_mask, allowed_mask;
285 /* Lock module and set up kernel thread */
289 /* After daemonize() this kernel thread shares current->fs
290 * with the init process. We need to create files with a
291 * umask of 0 instead of init's umask. */
292 fsp = copy_fs_struct(current->fs);
294 printk("Unable to start nfsd thread: out of memory\n");
299 current->fs->umask = 0;
301 siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS);
302 siginitsetinv(&allowed_mask, ALLOWED_SIGS);
306 lockd_up(); /* start lockd */
309 list_add(&me.list, &nfsd_list);
314 * We want less throttling in balance_dirty_pages() so that nfs to
315 * localhost doesn't cause nfsd to lock up due to all the client's
318 current->flags |= PF_LESS_THROTTLE;
321 * The main request loop
324 /* Block all but the shutdown signals */
325 sigprocmask(SIG_SETMASK, &shutdown_mask, NULL);
328 * Find a socket with data available and call its
331 while ((err = svc_recv(serv, rqstp,
332 60*60*HZ)) == -EAGAIN)
336 update_thread_usage(atomic_read(&nfsd_busy));
337 atomic_inc(&nfsd_busy);
339 /* Lock the export hash tables for reading. */
342 /* Process request with signals blocked. */
343 sigprocmask(SIG_SETMASK, &allowed_mask, NULL);
345 svc_process(serv, rqstp);
347 /* Unlock export hash tables */
349 update_thread_usage(atomic_read(&nfsd_busy));
350 atomic_dec(&nfsd_busy);
354 printk(KERN_WARNING "nfsd: terminating on error %d\n", -err);
358 for (signo = 1; signo <= _NSIG; signo++)
359 if (sigismember(¤t->pending.signal, signo) &&
360 !sigismember(¤t->blocked, signo))
364 /* Clear signals before calling lockd_down() and svc_exit_thread() */
365 flush_signals(current);
372 /* Check if this is last thread */
373 if (serv->sv_nrthreads==1) {
375 printk(KERN_WARNING "nfsd: last server has exited\n");
376 if (err != SIG_NOCLEAN) {
377 printk(KERN_WARNING "nfsd: unexporting all filesystems\n");
381 nfsd_racache_shutdown(); /* release read-ahead cache */
382 nfs4_state_shutdown();
388 /* Release the thread */
389 svc_exit_thread(rqstp);
393 module_put_and_exit(0);
397 nfsd_dispatch(struct svc_rqst *rqstp, u32 *statp)
399 struct svc_procedure *proc;
404 dprintk("nfsd_dispatch: vers %d proc %d\n",
405 rqstp->rq_vers, rqstp->rq_proc);
406 proc = rqstp->rq_procinfo;
408 /* Check whether we have this call in the cache. */
409 switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) {
419 /* Decode arguments */
420 xdr = proc->pc_decode;
421 if (xdr && !xdr(rqstp, (u32*)rqstp->rq_arg.head[0].iov_base,
423 dprintk("nfsd: failed to decode arguments!\n");
424 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
425 *statp = rpc_garbage_args;
429 /* need to grab the location to store the status, as
430 * nfsv4 does some encoding while processing
432 nfserrp = rqstp->rq_res.head[0].iov_base
433 + rqstp->rq_res.head[0].iov_len;
434 rqstp->rq_res.head[0].iov_len += sizeof(u32);
436 /* Now call the procedure handler, and encode NFS status. */
437 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
438 if (nfserr == nfserr_jukebox && rqstp->rq_vers == 2)
439 nfserr = nfserr_dropit;
440 if (nfserr == nfserr_dropit) {
441 dprintk("nfsd: Dropping request due to malloc failure!\n");
442 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
446 if (rqstp->rq_proc != 0)
450 * For NFSv2, additional info is never returned in case of an error.
452 if (!(nfserr && rqstp->rq_vers == 2)) {
453 xdr = proc->pc_encode;
454 if (xdr && !xdr(rqstp, nfserrp,
456 /* Failed to encode result. Release cache entry */
457 dprintk("nfsd: failed to encode result!\n");
458 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
459 *statp = rpc_system_err;
464 /* Store reply in cache. */
465 nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);