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 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 do_gettimeofday(&nfssvc_boot
); /* record boot time */
218 static int nfsd_init_socks(int port
)
221 if (!list_empty(&nfsd_serv
->sv_permsocks
))
224 error
= svc_makesock(nfsd_serv
, IPPROTO_UDP
, port
);
227 error
= lockd_up(IPPROTO_UDP
);
231 #ifdef CONFIG_NFSD_TCP
232 error
= svc_makesock(nfsd_serv
, IPPROTO_TCP
, port
);
235 error
= lockd_up(IPPROTO_TCP
);
243 nfsd_svc(unsigned short port
, int nrservs
)
246 struct list_head
*victim
;
249 dprintk("nfsd: creating service\n");
253 if (nrservs
> NFSD_MAXSERVS
)
254 nrservs
= NFSD_MAXSERVS
;
256 /* Readahead param cache - will no-op if it already exists */
257 error
= nfsd_racache_init(2*nrservs
);
260 error
= nfs4_state_start();
264 nfsd_reset_versions();
266 error
= nfsd_create_serv();
270 error
= nfsd_init_socks(port
);
274 nrservs
-= (nfsd_serv
->sv_nrthreads
-1);
275 while (nrservs
> 0) {
277 __module_get(THIS_MODULE
);
278 error
= svc_create_thread(nfsd
, nfsd_serv
);
280 module_put(THIS_MODULE
);
284 victim
= nfsd_list
.next
;
285 while (nrservs
< 0 && victim
!= &nfsd_list
) {
286 struct nfsd_list
*nl
=
287 list_entry(victim
,struct nfsd_list
, list
);
288 victim
= victim
->next
;
289 send_sig(SIG_NOCLEAN
, nl
->task
, 1);
293 svc_destroy(nfsd_serv
); /* Release server */
300 update_thread_usage(int busy_threads
)
302 unsigned long prev_call
;
306 spin_lock(&nfsd_call_lock
);
307 prev_call
= nfsd_last_call
;
308 nfsd_last_call
= jiffies
;
309 decile
= busy_threads
*10/nfsdstats
.th_cnt
;
310 if (decile
>0 && decile
<= 10) {
311 diff
= nfsd_last_call
- prev_call
;
312 if ( (nfsdstats
.th_usage
[decile
-1] += diff
) >= NFSD_USAGE_WRAP
)
313 nfsdstats
.th_usage
[decile
-1] -= NFSD_USAGE_WRAP
;
315 nfsdstats
.th_fullcnt
++;
317 spin_unlock(&nfsd_call_lock
);
321 * This is the NFS server kernel thread
324 nfsd(struct svc_rqst
*rqstp
)
326 struct fs_struct
*fsp
;
329 sigset_t shutdown_mask
, allowed_mask
;
331 /* Lock module and set up kernel thread */
335 /* After daemonize() this kernel thread shares current->fs
336 * with the init process. We need to create files with a
337 * umask of 0 instead of init's umask. */
338 fsp
= copy_fs_struct(current
->fs
);
340 printk("Unable to start nfsd thread: out of memory\n");
345 current
->fs
->umask
= 0;
347 siginitsetinv(&shutdown_mask
, SHUTDOWN_SIGS
);
348 siginitsetinv(&allowed_mask
, ALLOWED_SIGS
);
353 list_add(&me
.list
, &nfsd_list
);
358 * We want less throttling in balance_dirty_pages() so that nfs to
359 * localhost doesn't cause nfsd to lock up due to all the client's
362 current
->flags
|= PF_LESS_THROTTLE
;
365 * The main request loop
368 /* Block all but the shutdown signals */
369 sigprocmask(SIG_SETMASK
, &shutdown_mask
, NULL
);
372 * Find a socket with data available and call its
375 while ((err
= svc_recv(rqstp
, 60*60*HZ
)) == -EAGAIN
)
379 update_thread_usage(atomic_read(&nfsd_busy
));
380 atomic_inc(&nfsd_busy
);
382 /* Lock the export hash tables for reading. */
385 /* Process request with signals blocked. */
386 sigprocmask(SIG_SETMASK
, &allowed_mask
, NULL
);
390 /* Unlock export hash tables */
392 update_thread_usage(atomic_read(&nfsd_busy
));
393 atomic_dec(&nfsd_busy
);
397 printk(KERN_WARNING
"nfsd: terminating on error %d\n", -err
);
401 for (signo
= 1; signo
<= _NSIG
; signo
++)
402 if (sigismember(¤t
->pending
.signal
, signo
) &&
403 !sigismember(¤t
->blocked
, signo
))
407 /* Clear signals before calling svc_exit_thread() */
408 flush_signals(current
);
416 /* Release the thread */
417 svc_exit_thread(rqstp
);
421 module_put_and_exit(0);
425 nfsd_dispatch(struct svc_rqst
*rqstp
, u32
*statp
)
427 struct svc_procedure
*proc
;
432 dprintk("nfsd_dispatch: vers %d proc %d\n",
433 rqstp
->rq_vers
, rqstp
->rq_proc
);
434 proc
= rqstp
->rq_procinfo
;
436 /* Check whether we have this call in the cache. */
437 switch (nfsd_cache_lookup(rqstp
, proc
->pc_cachetype
)) {
447 /* Decode arguments */
448 xdr
= proc
->pc_decode
;
449 if (xdr
&& !xdr(rqstp
, (u32
*)rqstp
->rq_arg
.head
[0].iov_base
,
451 dprintk("nfsd: failed to decode arguments!\n");
452 nfsd_cache_update(rqstp
, RC_NOCACHE
, NULL
);
453 *statp
= rpc_garbage_args
;
457 /* need to grab the location to store the status, as
458 * nfsv4 does some encoding while processing
460 nfserrp
= rqstp
->rq_res
.head
[0].iov_base
461 + rqstp
->rq_res
.head
[0].iov_len
;
462 rqstp
->rq_res
.head
[0].iov_len
+= sizeof(u32
);
464 /* Now call the procedure handler, and encode NFS status. */
465 nfserr
= proc
->pc_func(rqstp
, rqstp
->rq_argp
, rqstp
->rq_resp
);
466 if (nfserr
== nfserr_jukebox
&& rqstp
->rq_vers
== 2)
467 nfserr
= nfserr_dropit
;
468 if (nfserr
== nfserr_dropit
) {
469 dprintk("nfsd: Dropping request due to malloc failure!\n");
470 nfsd_cache_update(rqstp
, RC_NOCACHE
, NULL
);
474 if (rqstp
->rq_proc
!= 0)
478 * For NFSv2, additional info is never returned in case of an error.
480 if (!(nfserr
&& rqstp
->rq_vers
== 2)) {
481 xdr
= proc
->pc_encode
;
482 if (xdr
&& !xdr(rqstp
, nfserrp
,
484 /* Failed to encode result. Release cache entry */
485 dprintk("nfsd: failed to encode result!\n");
486 nfsd_cache_update(rqstp
, RC_NOCACHE
, NULL
);
487 *statp
= rpc_system_err
;
492 /* Store reply in cache. */
493 nfsd_cache_update(rqstp
, proc
->pc_cachetype
, statp
+ 1);