blob: 7f3d76a7839d6ebb97f81b196190dd2346c50d84 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfsd/nfssvc.c
3 *
4 * Central processing for nfsd.
5 *
6 * Authors: Olaf Kirch (okir@monad.swb.de)
7 *
8 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
9 */
10
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/module.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040012#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/time.h>
14#include <linux/errno.h>
15#include <linux/nfs.h>
16#include <linux/in.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>
Rafael J. Wysocki83144182007-07-17 04:03:35 -070022#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/fs_struct.h>
Jeff Layton9867d762008-06-10 08:40:38 -040024#include <linux/kthread.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26#include <linux/sunrpc/types.h>
27#include <linux/sunrpc/stats.h>
28#include <linux/sunrpc/svc.h>
29#include <linux/sunrpc/svcsock.h>
30#include <linux/sunrpc/cache.h>
31#include <linux/nfsd/nfsd.h>
32#include <linux/nfsd/stats.h>
33#include <linux/nfsd/cache.h>
NeilBrown70c3b762005-11-07 01:00:25 -080034#include <linux/nfsd/syscall.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/lockd/bind.h>
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000036#include <linux/nfsacl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#define NFSDDBG_FACILITY NFSDDBG_SVC
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040extern struct svc_program nfsd_program;
Jeff Layton9867d762008-06-10 08:40:38 -040041static int nfsd(void *vrqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042struct timeval nfssvc_boot;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043static atomic_t nfsd_busy;
44static unsigned long nfsd_last_call;
45static DEFINE_SPINLOCK(nfsd_call_lock);
46
Neil Brownbedbdd82008-06-10 08:40:35 -040047/*
48 * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members
49 * of the svc_serv struct. In particular, ->sv_nrthreads but also to some
50 * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
51 *
52 * If (out side the lock) nfsd_serv is non-NULL, then it must point to a
53 * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number
54 * of nfsd threads must exist and each must listed in ->sp_all_threads in each
55 * entry of ->sv_pools[].
56 *
57 * Transitions of the thread count between zero and non-zero are of particular
58 * interest since the svc_serv needs to be created and initialized at that
59 * point, or freed.
Jeff Layton3dd98a32008-06-10 08:40:36 -040060 *
61 * Finally, the nfsd_mutex also protects some of the global variables that are
62 * accessed when nfsd starts and that are settable via the write_* routines in
63 * nfsctl.c. In particular:
64 *
65 * user_recovery_dirname
66 * user_lease_time
67 * nfsd_versions
Neil Brownbedbdd82008-06-10 08:40:35 -040068 */
69DEFINE_MUTEX(nfsd_mutex);
70struct svc_serv *nfsd_serv;
71
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080072#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
73static struct svc_stat nfsd_acl_svcstats;
74static struct svc_version * nfsd_acl_version[] = {
75 [2] = &nfsd_acl_version2,
76 [3] = &nfsd_acl_version3,
77};
78
79#define NFSD_ACL_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -080080#define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080081static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
82
83static struct svc_program nfsd_acl_program = {
84 .pg_prog = NFS_ACL_PROGRAM,
85 .pg_nvers = NFSD_ACL_NRVERS,
86 .pg_vers = nfsd_acl_versions,
NeilBrown1a8eff62007-01-26 00:56:58 -080087 .pg_name = "nfsacl",
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080088 .pg_class = "nfsd",
89 .pg_stats = &nfsd_acl_svcstats,
90 .pg_authenticate = &svc_set_client,
91};
92
93static struct svc_stat nfsd_acl_svcstats = {
94 .program = &nfsd_acl_program,
95};
96#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
97
NeilBrown70c3b762005-11-07 01:00:25 -080098static struct svc_version * nfsd_version[] = {
99 [2] = &nfsd_version2,
100#if defined(CONFIG_NFSD_V3)
101 [3] = &nfsd_version3,
102#endif
103#if defined(CONFIG_NFSD_V4)
104 [4] = &nfsd_version4,
105#endif
106};
107
108#define NFSD_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -0800109#define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
NeilBrown70c3b762005-11-07 01:00:25 -0800110static struct svc_version *nfsd_versions[NFSD_NRVERS];
111
112struct svc_program nfsd_program = {
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -0800113#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
114 .pg_next = &nfsd_acl_program,
115#endif
NeilBrown70c3b762005-11-07 01:00:25 -0800116 .pg_prog = NFS_PROGRAM, /* program number */
117 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
118 .pg_vers = nfsd_versions, /* version table */
119 .pg_name = "nfsd", /* program name */
120 .pg_class = "nfsd", /* authentication class */
121 .pg_stats = &nfsd_svcstats, /* version table */
122 .pg_authenticate = &svc_set_client, /* export authentication */
123
124};
125
NeilBrown6658d3a2006-10-02 02:17:46 -0700126int nfsd_vers(int vers, enum vers_op change)
127{
128 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
129 return -1;
130 switch(change) {
131 case NFSD_SET:
132 nfsd_versions[vers] = nfsd_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700133#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
134 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800135 nfsd_acl_versions[vers] = nfsd_acl_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700136#endif
NeilBrown1a8eff62007-01-26 00:56:58 -0800137 break;
NeilBrown6658d3a2006-10-02 02:17:46 -0700138 case NFSD_CLEAR:
139 nfsd_versions[vers] = NULL;
140#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
141 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800142 nfsd_acl_versions[vers] = NULL;
NeilBrown6658d3a2006-10-02 02:17:46 -0700143#endif
144 break;
145 case NFSD_TEST:
146 return nfsd_versions[vers] != NULL;
147 case NFSD_AVAIL:
148 return nfsd_version[vers] != NULL;
149 }
150 return 0;
151}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152/*
153 * Maximum number of nfsd processes
154 */
155#define NFSD_MAXSERVS 8192
156
157int nfsd_nrthreads(void)
158{
Neil Brownc7d106c2008-06-12 13:38:42 +1000159 int rv = 0;
160 mutex_lock(&nfsd_mutex);
161 if (nfsd_serv)
162 rv = nfsd_serv->sv_nrthreads;
163 mutex_unlock(&nfsd_mutex);
164 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165}
166
NeilBrownbc591cc2006-10-02 02:17:44 -0700167static void nfsd_last_thread(struct svc_serv *serv)
168{
169 /* When last nfsd thread exits we need to do some clean-up */
Tom Tucker7a182082007-12-30 21:07:53 -0600170 struct svc_xprt *xprt;
171 list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list)
NeilBrown24e36662006-10-02 02:17:45 -0700172 lockd_down();
NeilBrownbc591cc2006-10-02 02:17:44 -0700173 nfsd_serv = NULL;
174 nfsd_racache_shutdown();
175 nfs4_state_shutdown();
176
Jeff Laytone096bbc2008-06-10 08:40:37 -0400177 printk(KERN_WARNING "nfsd: last server has exited, flushing export "
178 "cache\n");
179 nfsd_export_flush();
NeilBrownbc591cc2006-10-02 02:17:44 -0700180}
NeilBrown6658d3a2006-10-02 02:17:46 -0700181
182void nfsd_reset_versions(void)
183{
184 int found_one = 0;
185 int i;
186
187 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
188 if (nfsd_program.pg_vers[i])
189 found_one = 1;
190 }
191
192 if (!found_one) {
193 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
194 nfsd_program.pg_vers[i] = nfsd_version[i];
195#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
196 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
197 nfsd_acl_program.pg_vers[i] =
198 nfsd_acl_version[i];
199#endif
200 }
201}
202
Neil Brownbedbdd82008-06-10 08:40:35 -0400203
NeilBrownb41b66d2006-10-02 02:17:48 -0700204int nfsd_create_serv(void)
NeilBrown02a375f2006-10-02 02:17:46 -0700205{
206 int err = 0;
Neil Brownbedbdd82008-06-10 08:40:35 -0400207
208 WARN_ON(!mutex_is_locked(&nfsd_mutex));
NeilBrown02a375f2006-10-02 02:17:46 -0700209 if (nfsd_serv) {
Greg Banks9a24ab52006-10-02 02:17:58 -0700210 svc_get(nfsd_serv);
NeilBrown02a375f2006-10-02 02:17:46 -0700211 return 0;
212 }
NeilBrown596bbe52006-10-04 02:15:48 -0700213 if (nfsd_max_blksize == 0) {
214 /* choose a suitable default */
215 struct sysinfo i;
216 si_meminfo(&i);
217 /* Aim for 1/4096 of memory per thread
218 * This gives 1MB on 4Gig machines
219 * But only uses 32K on 128M machines.
220 * Bottom out at 8K on 32M and smaller.
221 * Of course, this is only a default.
222 */
223 nfsd_max_blksize = NFSSVC_MAXBLKSIZE;
NeilBrown44c55602006-10-04 02:16:15 -0700224 i.totalram <<= PAGE_SHIFT - 12;
NeilBrown596bbe52006-10-04 02:15:48 -0700225 while (nfsd_max_blksize > i.totalram &&
226 nfsd_max_blksize >= 8*1024*2)
227 nfsd_max_blksize /= 2;
228 }
NeilBrown02a375f2006-10-02 02:17:46 -0700229
230 atomic_set(&nfsd_busy, 0);
Jeff Laytone096bbc2008-06-10 08:40:37 -0400231 nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
Chuck Levere851db52008-06-30 18:45:30 -0400232 AF_INET,
Jeff Laytona75c5d02008-06-10 08:40:39 -0400233 nfsd_last_thread, nfsd, THIS_MODULE);
NeilBrown02a375f2006-10-02 02:17:46 -0700234 if (nfsd_serv == NULL)
235 err = -ENOMEM;
Neil Brownbedbdd82008-06-10 08:40:35 -0400236
NeilBrown02a375f2006-10-02 02:17:46 -0700237 do_gettimeofday(&nfssvc_boot); /* record boot time */
238 return err;
239}
240
241static int nfsd_init_socks(int port)
242{
243 int error;
244 if (!list_empty(&nfsd_serv->sv_permsocks))
245 return 0;
246
NeilBrown02a375f2006-10-02 02:17:46 -0700247 error = lockd_up(IPPROTO_UDP);
NeilBrown4a3ae422006-10-02 02:17:53 -0700248 if (error >= 0) {
Tom Tuckerd7c9f1e2007-12-30 21:07:44 -0600249 error = svc_create_xprt(nfsd_serv, "udp", port,
Chuck Lever482fb942007-02-12 00:53:29 -0800250 SVC_SOCK_DEFAULTS);
NeilBrown4a3ae422006-10-02 02:17:53 -0700251 if (error < 0)
252 lockd_down();
253 }
NeilBrown02a375f2006-10-02 02:17:46 -0700254 if (error < 0)
255 return error;
256
NeilBrown02a375f2006-10-02 02:17:46 -0700257 error = lockd_up(IPPROTO_TCP);
NeilBrown4a3ae422006-10-02 02:17:53 -0700258 if (error >= 0) {
Tom Tuckerd7c9f1e2007-12-30 21:07:44 -0600259 error = svc_create_xprt(nfsd_serv, "tcp", port,
Chuck Lever482fb942007-02-12 00:53:29 -0800260 SVC_SOCK_DEFAULTS);
NeilBrown4a3ae422006-10-02 02:17:53 -0700261 if (error < 0)
262 lockd_down();
263 }
NeilBrown02a375f2006-10-02 02:17:46 -0700264 if (error < 0)
265 return error;
NeilBrown02a375f2006-10-02 02:17:46 -0700266 return 0;
267}
268
Greg Bankseed29652006-10-02 02:18:02 -0700269int nfsd_nrpools(void)
270{
271 if (nfsd_serv == NULL)
272 return 0;
273 else
274 return nfsd_serv->sv_nrpools;
275}
276
277int nfsd_get_nrthreads(int n, int *nthreads)
278{
279 int i = 0;
280
281 if (nfsd_serv != NULL) {
282 for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++)
283 nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads;
284 }
285
286 return 0;
287}
288
289int nfsd_set_nrthreads(int n, int *nthreads)
290{
291 int i = 0;
292 int tot = 0;
293 int err = 0;
294
Neil Brownbedbdd82008-06-10 08:40:35 -0400295 WARN_ON(!mutex_is_locked(&nfsd_mutex));
296
Greg Bankseed29652006-10-02 02:18:02 -0700297 if (nfsd_serv == NULL || n <= 0)
298 return 0;
299
300 if (n > nfsd_serv->sv_nrpools)
301 n = nfsd_serv->sv_nrpools;
302
303 /* enforce a global maximum number of threads */
304 tot = 0;
305 for (i = 0; i < n; i++) {
306 if (nthreads[i] > NFSD_MAXSERVS)
307 nthreads[i] = NFSD_MAXSERVS;
308 tot += nthreads[i];
309 }
310 if (tot > NFSD_MAXSERVS) {
311 /* total too large: scale down requested numbers */
312 for (i = 0; i < n && tot > 0; i++) {
313 int new = nthreads[i] * NFSD_MAXSERVS / tot;
314 tot -= (nthreads[i] - new);
315 nthreads[i] = new;
316 }
317 for (i = 0; i < n && tot > 0; i++) {
318 nthreads[i]--;
319 tot--;
320 }
321 }
322
323 /*
324 * There must always be a thread in pool 0; the admin
325 * can't shut down NFS completely using pool_threads.
326 */
327 if (nthreads[0] == 0)
328 nthreads[0] = 1;
329
330 /* apply the new numbers */
Greg Bankseed29652006-10-02 02:18:02 -0700331 svc_get(nfsd_serv);
332 for (i = 0; i < n; i++) {
333 err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i],
334 nthreads[i]);
335 if (err)
336 break;
337 }
338 svc_destroy(nfsd_serv);
Greg Bankseed29652006-10-02 02:18:02 -0700339
340 return err;
341}
342
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343int
344nfsd_svc(unsigned short port, int nrservs)
345{
346 int error;
Neil Brownbedbdd82008-06-10 08:40:35 -0400347
348 mutex_lock(&nfsd_mutex);
NeilBrown6658d3a2006-10-02 02:17:46 -0700349 dprintk("nfsd: creating service\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 error = -EINVAL;
351 if (nrservs <= 0)
352 nrservs = 0;
353 if (nrservs > NFSD_MAXSERVS)
354 nrservs = NFSD_MAXSERVS;
355
356 /* Readahead param cache - will no-op if it already exists */
357 error = nfsd_racache_init(2*nrservs);
358 if (error<0)
359 goto out;
J. Bruce Fieldse8ff2a82007-08-01 15:30:59 -0400360 nfs4_state_start();
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -0800361
NeilBrown02a375f2006-10-02 02:17:46 -0700362 nfsd_reset_versions();
363
364 error = nfsd_create_serv();
365
366 if (error)
367 goto out;
368 error = nfsd_init_socks(port);
369 if (error)
370 goto failure;
371
Greg Bankseec09662006-10-02 02:18:00 -0700372 error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 svc_destroy(nfsd_serv); /* Release server */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 out:
Neil Brownbedbdd82008-06-10 08:40:35 -0400376 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 return error;
378}
379
380static inline void
381update_thread_usage(int busy_threads)
382{
383 unsigned long prev_call;
384 unsigned long diff;
385 int decile;
386
387 spin_lock(&nfsd_call_lock);
388 prev_call = nfsd_last_call;
389 nfsd_last_call = jiffies;
390 decile = busy_threads*10/nfsdstats.th_cnt;
391 if (decile>0 && decile <= 10) {
392 diff = nfsd_last_call - prev_call;
393 if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP)
394 nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP;
395 if (decile == 10)
396 nfsdstats.th_fullcnt++;
397 }
398 spin_unlock(&nfsd_call_lock);
399}
400
401/*
402 * This is the NFS server kernel thread
403 */
Jeff Layton9867d762008-06-10 08:40:38 -0400404static int
405nfsd(void *vrqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
Jeff Layton9867d762008-06-10 08:40:38 -0400407 struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 struct fs_struct *fsp;
Jeff Layton9867d762008-06-10 08:40:38 -0400409 int err, preverr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411 /* Lock module and set up kernel thread */
Neil Brownbedbdd82008-06-10 08:40:35 -0400412 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Jeff Layton9867d762008-06-10 08:40:38 -0400414 /* At this point, the thread shares current->fs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 * with the init process. We need to create files with a
416 * umask of 0 instead of init's umask. */
417 fsp = copy_fs_struct(current->fs);
418 if (!fsp) {
419 printk("Unable to start nfsd thread: out of memory\n");
420 goto out;
421 }
422 exit_fs(current);
423 current->fs = fsp;
424 current->fs->umask = 0;
425
Jeff Layton9867d762008-06-10 08:40:38 -0400426 /*
427 * thread is spawned with all signals set to SIG_IGN, re-enable
Jeff Layton100766f2008-06-30 14:09:46 -0400428 * the ones that will bring down the thread
Jeff Layton9867d762008-06-10 08:40:38 -0400429 */
Jeff Layton100766f2008-06-30 14:09:46 -0400430 allow_signal(SIGKILL);
431 allow_signal(SIGHUP);
432 allow_signal(SIGINT);
433 allow_signal(SIGQUIT);
Neil Brownbedbdd82008-06-10 08:40:35 -0400434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 nfsdstats.th_cnt++;
Neil Brownbedbdd82008-06-10 08:40:35 -0400436 mutex_unlock(&nfsd_mutex);
437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 /*
439 * We want less throttling in balance_dirty_pages() so that nfs to
440 * localhost doesn't cause nfsd to lock up due to all the client's
441 * dirty pages.
442 */
443 current->flags |= PF_LESS_THROTTLE;
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700444 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
446 /*
447 * The main request loop
448 */
449 for (;;) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 /*
451 * Find a socket with data available and call its
452 * recvfrom routine.
453 */
NeilBrown6fb2b472006-10-02 02:17:50 -0700454 while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 ;
Jeff Layton9867d762008-06-10 08:40:38 -0400456 if (err == -EINTR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 break;
Jeff Layton9867d762008-06-10 08:40:38 -0400458 else if (err < 0) {
459 if (err != preverr) {
460 printk(KERN_WARNING "%s: unexpected error "
461 "from svc_recv (%d)\n", __func__, -err);
462 preverr = err;
463 }
464 schedule_timeout_uninterruptible(HZ);
465 continue;
466 }
467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 update_thread_usage(atomic_read(&nfsd_busy));
469 atomic_inc(&nfsd_busy);
470
471 /* Lock the export hash tables for reading. */
472 exp_readlock();
473
NeilBrown6fb2b472006-10-02 02:17:50 -0700474 svc_process(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476 /* Unlock export hash tables */
477 exp_readunlock();
478 update_thread_usage(atomic_read(&nfsd_busy));
479 atomic_dec(&nfsd_busy);
480 }
481
NeilBrown24e36662006-10-02 02:17:45 -0700482 /* Clear signals before calling svc_exit_thread() */
NeilBrown9e4160522005-04-16 15:26:37 -0700483 flush_signals(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Neil Brownbedbdd82008-06-10 08:40:35 -0400485 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 nfsdstats.th_cnt --;
487
488out:
489 /* Release the thread */
490 svc_exit_thread(rqstp);
491
492 /* Release module */
Neil Brownbedbdd82008-06-10 08:40:35 -0400493 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 module_put_and_exit(0);
Jeff Layton9867d762008-06-10 08:40:38 -0400495 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496}
497
Andy Adamson32c1eb02007-07-17 04:04:48 -0700498static __be32 map_new_errors(u32 vers, __be32 nfserr)
499{
500 if (nfserr == nfserr_jukebox && vers == 2)
501 return nfserr_dropit;
502 if (nfserr == nfserr_wrongsec && vers < 4)
503 return nfserr_acces;
504 return nfserr;
505}
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507int
Al Viroc7afef12006-10-19 23:29:02 -0700508nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509{
510 struct svc_procedure *proc;
511 kxdrproc_t xdr;
Al Viroad451d32006-10-19 23:28:55 -0700512 __be32 nfserr;
513 __be32 *nfserrp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515 dprintk("nfsd_dispatch: vers %d proc %d\n",
516 rqstp->rq_vers, rqstp->rq_proc);
517 proc = rqstp->rq_procinfo;
518
519 /* Check whether we have this call in the cache. */
520 switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) {
521 case RC_INTR:
522 case RC_DROPIT:
523 return 0;
524 case RC_REPLY:
525 return 1;
526 case RC_DOIT:;
527 /* do it */
528 }
529
530 /* Decode arguments */
531 xdr = proc->pc_decode;
Al Viroad451d32006-10-19 23:28:55 -0700532 if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 rqstp->rq_argp)) {
534 dprintk("nfsd: failed to decode arguments!\n");
535 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
536 *statp = rpc_garbage_args;
537 return 1;
538 }
539
540 /* need to grab the location to store the status, as
541 * nfsv4 does some encoding while processing
542 */
543 nfserrp = rqstp->rq_res.head[0].iov_base
544 + rqstp->rq_res.head[0].iov_len;
Al Viroad451d32006-10-19 23:28:55 -0700545 rqstp->rq_res.head[0].iov_len += sizeof(__be32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546
547 /* Now call the procedure handler, and encode NFS status. */
548 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
Andy Adamson32c1eb02007-07-17 04:04:48 -0700549 nfserr = map_new_errors(rqstp->rq_vers, nfserr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 if (nfserr == nfserr_dropit) {
J. Bruce Fields45457e02007-06-22 17:26:32 -0400551 dprintk("nfsd: Dropping request; may be revisited later\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
553 return 0;
554 }
555
556 if (rqstp->rq_proc != 0)
557 *nfserrp++ = nfserr;
558
559 /* Encode result.
560 * For NFSv2, additional info is never returned in case of an error.
561 */
562 if (!(nfserr && rqstp->rq_vers == 2)) {
563 xdr = proc->pc_encode;
564 if (xdr && !xdr(rqstp, nfserrp,
565 rqstp->rq_resp)) {
566 /* Failed to encode result. Release cache entry */
567 dprintk("nfsd: failed to encode result!\n");
568 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
569 *statp = rpc_system_err;
570 return 1;
571 }
572 }
573
574 /* Store reply in cache. */
575 nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);
576 return 1;
577}