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/config.h>
12 #include <linux/module.h>
14 #include <linux/time.h>
15 #include <linux/errno.h>
16 #include <linux/nfs.h>
18 #include <linux/uio.h>
19 #include <linux/unistd.h>
20 #include <linux/slab.h>
21 #include <linux/smp.h>
22 #include <linux/smp_lock.h>
23 #include <linux/fs_struct.h>
25 #include <linux/sunrpc/types.h>
26 #include <linux/sunrpc/stats.h>
27 #include <linux/sunrpc/svc.h>
28 #include <linux/sunrpc/svcsock.h>
29 #include <linux/sunrpc/cache.h>
30 #include <linux/nfsd/nfsd.h>
31 #include <linux/nfsd/stats.h>
32 #include <linux/nfsd/cache.h>
33 #include <linux/nfsd/syscall.h>
34 #include <linux/lockd/bind.h>
35 #include <linux/nfsacl.h>
37 #define NFSDDBG_FACILITY NFSDDBG_SVC
39 /* these signals will be delivered to an nfsd thread
40 * when handling a request
42 #define ALLOWED_SIGS (sigmask(SIGKILL))
43 /* these signals will be delivered to an nfsd thread
44 * when not handling a request. i.e. when waiting
46 #define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT))
47 /* if the last thread dies with SIGHUP, then the exports table is
48 * left unchanged ( like 2.4-{0-9} ). Any other signal will clear
49 * the exports table (like 2.2).
51 #define SIG_NOCLEAN SIGHUP
53 extern struct svc_program nfsd_program;
54 static void nfsd(struct svc_rqst *rqstp);
55 struct timeval nfssvc_boot;
56 struct svc_serv *nfsd_serv;
57 static atomic_t nfsd_busy;
58 static unsigned long nfsd_last_call;
59 static DEFINE_SPINLOCK(nfsd_call_lock);
62 struct list_head list;
63 struct task_struct *task;
65 static struct list_head nfsd_list = LIST_HEAD_INIT(nfsd_list);
67 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
68 static struct svc_stat nfsd_acl_svcstats;
69 static struct svc_version * nfsd_acl_version[] = {
70 [2] = &nfsd_acl_version2,
71 [3] = &nfsd_acl_version3,
74 #define NFSD_ACL_MINVERS 2
75 #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
76 static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
78 static struct svc_program nfsd_acl_program = {
79 .pg_prog = NFS_ACL_PROGRAM,
80 .pg_nvers = NFSD_ACL_NRVERS,
81 .pg_vers = nfsd_acl_versions,
84 .pg_stats = &nfsd_acl_svcstats,
85 .pg_authenticate = &svc_set_client,
88 static struct svc_stat nfsd_acl_svcstats = {
89 .program = &nfsd_acl_program,
91 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
93 extern struct svc_version nfsd_version2, nfsd_version3, nfsd_version4;
95 static struct svc_version * nfsd_version[] = {
97 #if defined(CONFIG_NFSD_V3)
100 #if defined(CONFIG_NFSD_V4)
101 [4] = &nfsd_version4,
105 #define NFSD_MINVERS 2
106 #define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
107 static struct svc_version *nfsd_versions[NFSD_NRVERS];
109 struct svc_program nfsd_program = {
110 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
111 .pg_next = &nfsd_acl_program,
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 */
124 * Maximum number of nfsd processes
126 #define NFSD_MAXSERVS 8192
128 int nfsd_nrthreads(void)
130 if (nfsd_serv == NULL)
133 return nfsd_serv->sv_nrthreads;
137 nfsd_svc(unsigned short port, int nrservs)
140 int none_left, found_one, i;
141 struct list_head *victim;
144 dprintk("nfsd: creating service: port %d vers 0x%x proto 0x%x\n",
145 nfsd_port, nfsd_versbits, nfsd_portbits);
149 if (nrservs > NFSD_MAXSERVS)
150 nrservs = NFSD_MAXSERVS;
152 /* Readahead param cache - will no-op if it already exists */
153 error = nfsd_racache_init(2*nrservs);
156 error = nfs4_state_start();
161 * Use the nfsd_ctlbits to define which
162 * versions that will be advertised.
163 * If nfsd_ctlbits doesn't list any version,
168 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
169 if (NFSCTL_VERISSET(nfsd_versbits, i)) {
170 nfsd_program.pg_vers[i] = nfsd_version[i];
173 nfsd_program.pg_vers[i] = NULL;
177 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
178 nfsd_program.pg_vers[i] = nfsd_version[i];
182 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
185 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) {
186 if (NFSCTL_VERISSET(nfsd_versbits, i)) {
187 nfsd_acl_program.pg_vers[i] =
191 nfsd_acl_program.pg_vers[i] = NULL;
195 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
196 nfsd_acl_program.pg_vers[i] =
201 atomic_set(&nfsd_busy, 0);
203 nfsd_serv = svc_create(&nfsd_program, NFSD_BUFSIZE);
204 if (nfsd_serv == NULL)
206 if (NFSCTL_UDPISSET(nfsd_portbits))
208 error = svc_makesock(nfsd_serv, IPPROTO_UDP, port);
212 #ifdef CONFIG_NFSD_TCP
213 if (NFSCTL_TCPISSET(nfsd_portbits))
215 error = svc_makesock(nfsd_serv, IPPROTO_TCP, port);
219 do_gettimeofday(&nfssvc_boot); /* record boot time */
221 nfsd_serv->sv_nrthreads++;
222 nrservs -= (nfsd_serv->sv_nrthreads-1);
223 while (nrservs > 0) {
225 __module_get(THIS_MODULE);
226 error = svc_create_thread(nfsd, nfsd_serv);
228 module_put(THIS_MODULE);
232 victim = nfsd_list.next;
233 while (nrservs < 0 && victim != &nfsd_list) {
234 struct nfsd_list *nl =
235 list_entry(victim,struct nfsd_list, list);
236 victim = victim->next;
237 send_sig(SIG_NOCLEAN, nl->task, 1);
241 none_left = (nfsd_serv->sv_nrthreads == 1);
242 svc_destroy(nfsd_serv); /* Release server */
245 nfsd_racache_shutdown();
246 nfs4_state_shutdown();
254 update_thread_usage(int busy_threads)
256 unsigned long prev_call;
260 spin_lock(&nfsd_call_lock);
261 prev_call = nfsd_last_call;
262 nfsd_last_call = jiffies;
263 decile = busy_threads*10/nfsdstats.th_cnt;
264 if (decile>0 && decile <= 10) {
265 diff = nfsd_last_call - prev_call;
266 if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP)
267 nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP;
269 nfsdstats.th_fullcnt++;
271 spin_unlock(&nfsd_call_lock);
275 * This is the NFS server kernel thread
278 nfsd(struct svc_rqst *rqstp)
280 struct svc_serv *serv = rqstp->rq_server;
281 struct fs_struct *fsp;
284 sigset_t shutdown_mask, allowed_mask;
286 /* Lock module and set up kernel thread */
290 /* After daemonize() this kernel thread shares current->fs
291 * with the init process. We need to create files with a
292 * umask of 0 instead of init's umask. */
293 fsp = copy_fs_struct(current->fs);
295 printk("Unable to start nfsd thread: out of memory\n");
300 current->fs->umask = 0;
302 siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS);
303 siginitsetinv(&allowed_mask, ALLOWED_SIGS);
307 lockd_up(); /* start lockd */
310 list_add(&me.list, &nfsd_list);
315 * We want less throttling in balance_dirty_pages() so that nfs to
316 * localhost doesn't cause nfsd to lock up due to all the client's
319 current->flags |= PF_LESS_THROTTLE;
322 * The main request loop
325 /* Block all but the shutdown signals */
326 sigprocmask(SIG_SETMASK, &shutdown_mask, NULL);
329 * Find a socket with data available and call its
332 while ((err = svc_recv(serv, rqstp,
333 60*60*HZ)) == -EAGAIN)
337 update_thread_usage(atomic_read(&nfsd_busy));
338 atomic_inc(&nfsd_busy);
340 /* Lock the export hash tables for reading. */
343 /* Process request with signals blocked. */
344 sigprocmask(SIG_SETMASK, &allowed_mask, NULL);
346 svc_process(serv, rqstp);
348 /* Unlock export hash tables */
350 update_thread_usage(atomic_read(&nfsd_busy));
351 atomic_dec(&nfsd_busy);
355 printk(KERN_WARNING "nfsd: terminating on error %d\n", -err);
359 for (signo = 1; signo <= _NSIG; signo++)
360 if (sigismember(¤t->pending.signal, signo) &&
361 !sigismember(¤t->blocked, signo))
365 /* Clear signals before calling lockd_down() and svc_exit_thread() */
366 flush_signals(current);
373 /* Check if this is last thread */
374 if (serv->sv_nrthreads==1) {
376 printk(KERN_WARNING "nfsd: last server has exited\n");
377 if (err != SIG_NOCLEAN) {
378 printk(KERN_WARNING "nfsd: unexporting all filesystems\n");
382 nfsd_racache_shutdown(); /* release read-ahead cache */
383 nfs4_state_shutdown();
389 /* Release the thread */
390 svc_exit_thread(rqstp);
394 module_put_and_exit(0);
398 nfsd_dispatch(struct svc_rqst *rqstp, u32 *statp)
400 struct svc_procedure *proc;
405 dprintk("nfsd_dispatch: vers %d proc %d\n",
406 rqstp->rq_vers, rqstp->rq_proc);
407 proc = rqstp->rq_procinfo;
409 /* Check whether we have this call in the cache. */
410 switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) {
420 /* Decode arguments */
421 xdr = proc->pc_decode;
422 if (xdr && !xdr(rqstp, (u32*)rqstp->rq_arg.head[0].iov_base,
424 dprintk("nfsd: failed to decode arguments!\n");
425 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
426 *statp = rpc_garbage_args;
430 /* need to grab the location to store the status, as
431 * nfsv4 does some encoding while processing
433 nfserrp = rqstp->rq_res.head[0].iov_base
434 + rqstp->rq_res.head[0].iov_len;
435 rqstp->rq_res.head[0].iov_len += sizeof(u32);
437 /* Now call the procedure handler, and encode NFS status. */
438 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
439 if (nfserr == nfserr_jukebox && rqstp->rq_vers == 2)
440 nfserr = nfserr_dropit;
441 if (nfserr == nfserr_dropit) {
442 dprintk("nfsd: Dropping request due to malloc failure!\n");
443 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
447 if (rqstp->rq_proc != 0)
451 * For NFSv2, additional info is never returned in case of an error.
453 if (!(nfserr && rqstp->rq_vers == 2)) {
454 xdr = proc->pc_encode;
455 if (xdr && !xdr(rqstp, nfserrp,
457 /* Failed to encode result. Release cache entry */
458 dprintk("nfsd: failed to encode result!\n");
459 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
460 *statp = rpc_system_err;
465 /* Store reply in cache. */
466 nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);