blob: 67ea83eedd43eb7b69e896e1db54f8fd995a0d9e [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>
Rafael J. Wysocki83144182007-07-17 04:03:35 -070021#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/fs_struct.h>
Jeff Layton9867d762008-06-10 08:40:38 -040023#include <linux/kthread.h>
Andy Adamsonc3d06f92009-04-03 08:28:18 +030024#include <linux/swap.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>
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +090037#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#define NFSDDBG_FACILITY NFSDDBG_SVC
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041extern struct svc_program nfsd_program;
Jeff Layton9867d762008-06-10 08:40:38 -040042static int nfsd(void *vrqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043struct timeval nfssvc_boot;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Neil Brownbedbdd82008-06-10 08:40:35 -040045/*
46 * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members
47 * of the svc_serv struct. In particular, ->sv_nrthreads but also to some
48 * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
49 *
50 * If (out side the lock) nfsd_serv is non-NULL, then it must point to a
51 * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number
52 * of nfsd threads must exist and each must listed in ->sp_all_threads in each
53 * entry of ->sv_pools[].
54 *
55 * Transitions of the thread count between zero and non-zero are of particular
56 * interest since the svc_serv needs to be created and initialized at that
57 * point, or freed.
Jeff Layton3dd98a32008-06-10 08:40:36 -040058 *
59 * Finally, the nfsd_mutex also protects some of the global variables that are
60 * accessed when nfsd starts and that are settable via the write_* routines in
61 * nfsctl.c. In particular:
62 *
63 * user_recovery_dirname
64 * user_lease_time
65 * nfsd_versions
Neil Brownbedbdd82008-06-10 08:40:35 -040066 */
67DEFINE_MUTEX(nfsd_mutex);
68struct svc_serv *nfsd_serv;
69
Andy Adamson4bd9b0f42009-06-24 15:37:45 -040070/*
71 * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
72 * nfsd_drc_max_pages limits the total amount of memory available for
73 * version 4.1 DRC caches.
74 * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
75 */
76spinlock_t nfsd_drc_lock;
Andy Adamson0c193052009-07-27 19:09:19 -040077unsigned int nfsd_drc_max_mem;
78unsigned int nfsd_drc_mem_used;
Andy Adamson4bd9b0f42009-06-24 15:37:45 -040079
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080080#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
81static struct svc_stat nfsd_acl_svcstats;
82static struct svc_version * nfsd_acl_version[] = {
83 [2] = &nfsd_acl_version2,
84 [3] = &nfsd_acl_version3,
85};
86
87#define NFSD_ACL_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -080088#define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080089static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
90
91static struct svc_program nfsd_acl_program = {
92 .pg_prog = NFS_ACL_PROGRAM,
93 .pg_nvers = NFSD_ACL_NRVERS,
94 .pg_vers = nfsd_acl_versions,
NeilBrown1a8eff62007-01-26 00:56:58 -080095 .pg_name = "nfsacl",
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080096 .pg_class = "nfsd",
97 .pg_stats = &nfsd_acl_svcstats,
98 .pg_authenticate = &svc_set_client,
99};
100
101static struct svc_stat nfsd_acl_svcstats = {
102 .program = &nfsd_acl_program,
103};
104#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
105
NeilBrown70c3b762005-11-07 01:00:25 -0800106static struct svc_version * nfsd_version[] = {
107 [2] = &nfsd_version2,
108#if defined(CONFIG_NFSD_V3)
109 [3] = &nfsd_version3,
110#endif
111#if defined(CONFIG_NFSD_V4)
112 [4] = &nfsd_version4,
113#endif
114};
115
116#define NFSD_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -0800117#define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
NeilBrown70c3b762005-11-07 01:00:25 -0800118static struct svc_version *nfsd_versions[NFSD_NRVERS];
119
120struct svc_program nfsd_program = {
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -0800121#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
122 .pg_next = &nfsd_acl_program,
123#endif
NeilBrown70c3b762005-11-07 01:00:25 -0800124 .pg_prog = NFS_PROGRAM, /* program number */
125 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
126 .pg_vers = nfsd_versions, /* version table */
127 .pg_name = "nfsd", /* program name */
128 .pg_class = "nfsd", /* authentication class */
129 .pg_stats = &nfsd_svcstats, /* version table */
130 .pg_authenticate = &svc_set_client, /* export authentication */
131
132};
133
Benny Halevy8daf2202009-04-03 08:28:59 +0300134u32 nfsd_supported_minorversion;
135
NeilBrown6658d3a2006-10-02 02:17:46 -0700136int nfsd_vers(int vers, enum vers_op change)
137{
138 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
139 return -1;
140 switch(change) {
141 case NFSD_SET:
142 nfsd_versions[vers] = nfsd_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700143#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
144 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800145 nfsd_acl_versions[vers] = nfsd_acl_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700146#endif
NeilBrown1a8eff62007-01-26 00:56:58 -0800147 break;
NeilBrown6658d3a2006-10-02 02:17:46 -0700148 case NFSD_CLEAR:
149 nfsd_versions[vers] = NULL;
150#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
151 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800152 nfsd_acl_versions[vers] = NULL;
NeilBrown6658d3a2006-10-02 02:17:46 -0700153#endif
154 break;
155 case NFSD_TEST:
156 return nfsd_versions[vers] != NULL;
157 case NFSD_AVAIL:
158 return nfsd_version[vers] != NULL;
159 }
160 return 0;
161}
Benny Halevy8daf2202009-04-03 08:28:59 +0300162
163int nfsd_minorversion(u32 minorversion, enum vers_op change)
164{
165 if (minorversion > NFSD_SUPPORTED_MINOR_VERSION)
166 return -1;
167 switch(change) {
168 case NFSD_SET:
169 nfsd_supported_minorversion = minorversion;
170 break;
171 case NFSD_CLEAR:
172 if (minorversion == 0)
173 return -1;
174 nfsd_supported_minorversion = minorversion - 1;
175 break;
176 case NFSD_TEST:
177 return minorversion <= nfsd_supported_minorversion;
178 case NFSD_AVAIL:
179 return minorversion <= NFSD_SUPPORTED_MINOR_VERSION;
180 }
181 return 0;
182}
183
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184/*
185 * Maximum number of nfsd processes
186 */
187#define NFSD_MAXSERVS 8192
188
189int nfsd_nrthreads(void)
190{
Neil Brownc7d106c2008-06-12 13:38:42 +1000191 int rv = 0;
192 mutex_lock(&nfsd_mutex);
193 if (nfsd_serv)
194 rv = nfsd_serv->sv_nrthreads;
195 mutex_unlock(&nfsd_mutex);
196 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
198
NeilBrownbc591cc2006-10-02 02:17:44 -0700199static void nfsd_last_thread(struct svc_serv *serv)
200{
201 /* When last nfsd thread exits we need to do some clean-up */
Tom Tucker7a182082007-12-30 21:07:53 -0600202 struct svc_xprt *xprt;
203 list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list)
NeilBrown24e36662006-10-02 02:17:45 -0700204 lockd_down();
NeilBrownbc591cc2006-10-02 02:17:44 -0700205 nfsd_serv = NULL;
206 nfsd_racache_shutdown();
207 nfs4_state_shutdown();
208
Jeff Laytone096bbc2008-06-10 08:40:37 -0400209 printk(KERN_WARNING "nfsd: last server has exited, flushing export "
210 "cache\n");
211 nfsd_export_flush();
NeilBrownbc591cc2006-10-02 02:17:44 -0700212}
NeilBrown6658d3a2006-10-02 02:17:46 -0700213
214void nfsd_reset_versions(void)
215{
216 int found_one = 0;
217 int i;
218
219 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
220 if (nfsd_program.pg_vers[i])
221 found_one = 1;
222 }
223
224 if (!found_one) {
225 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
226 nfsd_program.pg_vers[i] = nfsd_version[i];
227#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
228 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
229 nfsd_acl_program.pg_vers[i] =
230 nfsd_acl_version[i];
231#endif
232 }
233}
234
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300235/*
236 * Each session guarantees a negotiated per slot memory cache for replies
237 * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
238 * NFSv4.1 server might want to use more memory for a DRC than a machine
239 * with mutiple services.
240 *
241 * Impose a hard limit on the number of pages for the DRC which varies
242 * according to the machines free pages. This is of course only a default.
243 *
244 * For now this is a #defined shift which could be under admin control
245 * in the future.
246 */
247static void set_max_drc(void)
248{
Andy Adamson6a14dd12009-07-27 19:06:45 -0400249 #define NFSD_DRC_SIZE_SHIFT 10
Andy Adamson0c193052009-07-27 19:09:19 -0400250 nfsd_drc_max_mem = (nr_free_buffer_pages()
251 >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
252 nfsd_drc_mem_used = 0;
Andy Adamson4bd9b0f42009-06-24 15:37:45 -0400253 spin_lock_init(&nfsd_drc_lock);
Andy Adamson0c193052009-07-27 19:09:19 -0400254 dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem);
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300255}
Neil Brownbedbdd82008-06-10 08:40:35 -0400256
NeilBrownb41b66d2006-10-02 02:17:48 -0700257int nfsd_create_serv(void)
NeilBrown02a375f2006-10-02 02:17:46 -0700258{
259 int err = 0;
Neil Brownbedbdd82008-06-10 08:40:35 -0400260
261 WARN_ON(!mutex_is_locked(&nfsd_mutex));
NeilBrown02a375f2006-10-02 02:17:46 -0700262 if (nfsd_serv) {
Greg Banks9a24ab52006-10-02 02:17:58 -0700263 svc_get(nfsd_serv);
NeilBrown02a375f2006-10-02 02:17:46 -0700264 return 0;
265 }
NeilBrown596bbe52006-10-04 02:15:48 -0700266 if (nfsd_max_blksize == 0) {
267 /* choose a suitable default */
268 struct sysinfo i;
269 si_meminfo(&i);
270 /* Aim for 1/4096 of memory per thread
271 * This gives 1MB on 4Gig machines
272 * But only uses 32K on 128M machines.
273 * Bottom out at 8K on 32M and smaller.
274 * Of course, this is only a default.
275 */
276 nfsd_max_blksize = NFSSVC_MAXBLKSIZE;
NeilBrown44c55602006-10-04 02:16:15 -0700277 i.totalram <<= PAGE_SHIFT - 12;
NeilBrown596bbe52006-10-04 02:15:48 -0700278 while (nfsd_max_blksize > i.totalram &&
279 nfsd_max_blksize >= 8*1024*2)
280 nfsd_max_blksize /= 2;
281 }
NeilBrown02a375f2006-10-02 02:17:46 -0700282
Jeff Laytone096bbc2008-06-10 08:40:37 -0400283 nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
Jeff Laytona75c5d02008-06-10 08:40:39 -0400284 nfsd_last_thread, nfsd, THIS_MODULE);
NeilBrown02a375f2006-10-02 02:17:46 -0700285 if (nfsd_serv == NULL)
286 err = -ENOMEM;
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300287 else
288 set_max_drc();
Neil Brownbedbdd82008-06-10 08:40:35 -0400289
NeilBrown02a375f2006-10-02 02:17:46 -0700290 do_gettimeofday(&nfssvc_boot); /* record boot time */
291 return err;
292}
293
294static int nfsd_init_socks(int port)
295{
296 int error;
297 if (!list_empty(&nfsd_serv->sv_permsocks))
298 return 0;
299
Chuck Lever9652ada2009-03-18 20:46:21 -0400300 error = svc_create_xprt(nfsd_serv, "udp", PF_INET, port,
Chuck Lever482fb942007-02-12 00:53:29 -0800301 SVC_SOCK_DEFAULTS);
NeilBrown02a375f2006-10-02 02:17:46 -0700302 if (error < 0)
303 return error;
304
Chuck Lever1cd9cd12008-10-22 13:12:36 -0400305 error = lockd_up();
306 if (error < 0)
307 return error;
308
Chuck Lever9652ada2009-03-18 20:46:21 -0400309 error = svc_create_xprt(nfsd_serv, "tcp", PF_INET, port,
Chuck Lever482fb942007-02-12 00:53:29 -0800310 SVC_SOCK_DEFAULTS);
NeilBrown02a375f2006-10-02 02:17:46 -0700311 if (error < 0)
312 return error;
Chuck Lever26a41402008-10-03 17:15:30 -0400313
314 error = lockd_up();
315 if (error < 0)
316 return error;
317
NeilBrown02a375f2006-10-02 02:17:46 -0700318 return 0;
319}
320
Greg Bankseed29652006-10-02 02:18:02 -0700321int nfsd_nrpools(void)
322{
323 if (nfsd_serv == NULL)
324 return 0;
325 else
326 return nfsd_serv->sv_nrpools;
327}
328
329int nfsd_get_nrthreads(int n, int *nthreads)
330{
331 int i = 0;
332
333 if (nfsd_serv != NULL) {
334 for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++)
335 nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads;
336 }
337
338 return 0;
339}
340
341int nfsd_set_nrthreads(int n, int *nthreads)
342{
343 int i = 0;
344 int tot = 0;
345 int err = 0;
346
Neil Brownbedbdd82008-06-10 08:40:35 -0400347 WARN_ON(!mutex_is_locked(&nfsd_mutex));
348
Greg Bankseed29652006-10-02 02:18:02 -0700349 if (nfsd_serv == NULL || n <= 0)
350 return 0;
351
352 if (n > nfsd_serv->sv_nrpools)
353 n = nfsd_serv->sv_nrpools;
354
355 /* enforce a global maximum number of threads */
356 tot = 0;
357 for (i = 0; i < n; i++) {
358 if (nthreads[i] > NFSD_MAXSERVS)
359 nthreads[i] = NFSD_MAXSERVS;
360 tot += nthreads[i];
361 }
362 if (tot > NFSD_MAXSERVS) {
363 /* total too large: scale down requested numbers */
364 for (i = 0; i < n && tot > 0; i++) {
365 int new = nthreads[i] * NFSD_MAXSERVS / tot;
366 tot -= (nthreads[i] - new);
367 nthreads[i] = new;
368 }
369 for (i = 0; i < n && tot > 0; i++) {
370 nthreads[i]--;
371 tot--;
372 }
373 }
374
375 /*
376 * There must always be a thread in pool 0; the admin
377 * can't shut down NFS completely using pool_threads.
378 */
379 if (nthreads[0] == 0)
380 nthreads[0] = 1;
381
382 /* apply the new numbers */
Greg Bankseed29652006-10-02 02:18:02 -0700383 svc_get(nfsd_serv);
384 for (i = 0; i < n; i++) {
385 err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i],
386 nthreads[i]);
387 if (err)
388 break;
389 }
390 svc_destroy(nfsd_serv);
Greg Bankseed29652006-10-02 02:18:02 -0700391
392 return err;
393}
394
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395int
396nfsd_svc(unsigned short port, int nrservs)
397{
398 int error;
Neil Brownbedbdd82008-06-10 08:40:35 -0400399
400 mutex_lock(&nfsd_mutex);
NeilBrown6658d3a2006-10-02 02:17:46 -0700401 dprintk("nfsd: creating service\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 if (nrservs <= 0)
403 nrservs = 0;
404 if (nrservs > NFSD_MAXSERVS)
405 nrservs = NFSD_MAXSERVS;
NeilBrown671e1fc2009-06-16 11:03:20 +1000406 error = 0;
407 if (nrservs == 0 && nfsd_serv == NULL)
408 goto out;
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 /* Readahead param cache - will no-op if it already exists */
411 error = nfsd_racache_init(2*nrservs);
412 if (error<0)
413 goto out;
J. Bruce Fields29ab23c2009-09-15 15:56:50 -0400414 error = nfs4_state_start();
415 if (error)
416 goto out;
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -0800417
NeilBrown02a375f2006-10-02 02:17:46 -0700418 nfsd_reset_versions();
419
420 error = nfsd_create_serv();
421
422 if (error)
423 goto out;
424 error = nfsd_init_socks(port);
425 if (error)
426 goto failure;
427
Greg Bankseec09662006-10-02 02:18:00 -0700428 error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
NeilBrown82e12fe2009-06-16 11:03:07 +1000429 if (error == 0)
430 /* We are holding a reference to nfsd_serv which
431 * we don't want to count in the return value,
432 * so subtract 1
433 */
434 error = nfsd_serv->sv_nrthreads - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 svc_destroy(nfsd_serv); /* Release server */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 out:
Neil Brownbedbdd82008-06-10 08:40:35 -0400438 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 return error;
440}
441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443/*
444 * This is the NFS server kernel thread
445 */
Jeff Layton9867d762008-06-10 08:40:38 -0400446static int
447nfsd(void *vrqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448{
Jeff Layton9867d762008-06-10 08:40:38 -0400449 struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
Jeff Layton9867d762008-06-10 08:40:38 -0400450 int err, preverr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
452 /* Lock module and set up kernel thread */
Neil Brownbedbdd82008-06-10 08:40:35 -0400453 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Jeff Layton9867d762008-06-10 08:40:38 -0400455 /* At this point, the thread shares current->fs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 * with the init process. We need to create files with a
457 * umask of 0 instead of init's umask. */
Al Viro3e93cd62009-03-29 19:00:13 -0400458 if (unshare_fs_struct() < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 printk("Unable to start nfsd thread: out of memory\n");
460 goto out;
461 }
Al Viro3e93cd62009-03-29 19:00:13 -0400462
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 current->fs->umask = 0;
464
Jeff Layton9867d762008-06-10 08:40:38 -0400465 /*
466 * thread is spawned with all signals set to SIG_IGN, re-enable
Jeff Layton100766f2008-06-30 14:09:46 -0400467 * the ones that will bring down the thread
Jeff Layton9867d762008-06-10 08:40:38 -0400468 */
Jeff Layton100766f2008-06-30 14:09:46 -0400469 allow_signal(SIGKILL);
470 allow_signal(SIGHUP);
471 allow_signal(SIGINT);
472 allow_signal(SIGQUIT);
Neil Brownbedbdd82008-06-10 08:40:35 -0400473
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 nfsdstats.th_cnt++;
Neil Brownbedbdd82008-06-10 08:40:35 -0400475 mutex_unlock(&nfsd_mutex);
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 /*
478 * We want less throttling in balance_dirty_pages() so that nfs to
479 * localhost doesn't cause nfsd to lock up due to all the client's
480 * dirty pages.
481 */
482 current->flags |= PF_LESS_THROTTLE;
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700483 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
485 /*
486 * The main request loop
487 */
488 for (;;) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 /*
490 * Find a socket with data available and call its
491 * recvfrom routine.
492 */
NeilBrown6fb2b472006-10-02 02:17:50 -0700493 while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 ;
Jeff Layton9867d762008-06-10 08:40:38 -0400495 if (err == -EINTR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 break;
Jeff Layton9867d762008-06-10 08:40:38 -0400497 else if (err < 0) {
498 if (err != preverr) {
499 printk(KERN_WARNING "%s: unexpected error "
500 "from svc_recv (%d)\n", __func__, -err);
501 preverr = err;
502 }
503 schedule_timeout_uninterruptible(HZ);
504 continue;
505 }
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
508 /* Lock the export hash tables for reading. */
509 exp_readlock();
510
David Howellse0e81732009-09-02 09:13:40 +0100511 validate_process_creds();
NeilBrown6fb2b472006-10-02 02:17:50 -0700512 svc_process(rqstp);
David Howellse0e81732009-09-02 09:13:40 +0100513 validate_process_creds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515 /* Unlock export hash tables */
516 exp_readunlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 }
518
NeilBrown24e36662006-10-02 02:17:45 -0700519 /* Clear signals before calling svc_exit_thread() */
NeilBrown9e4160522005-04-16 15:26:37 -0700520 flush_signals(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Neil Brownbedbdd82008-06-10 08:40:35 -0400522 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 nfsdstats.th_cnt --;
524
525out:
526 /* Release the thread */
527 svc_exit_thread(rqstp);
528
529 /* Release module */
Neil Brownbedbdd82008-06-10 08:40:35 -0400530 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 module_put_and_exit(0);
Jeff Layton9867d762008-06-10 08:40:38 -0400532 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533}
534
Andy Adamson32c1eb02007-07-17 04:04:48 -0700535static __be32 map_new_errors(u32 vers, __be32 nfserr)
536{
537 if (nfserr == nfserr_jukebox && vers == 2)
538 return nfserr_dropit;
539 if (nfserr == nfserr_wrongsec && vers < 4)
540 return nfserr_acces;
541 return nfserr;
542}
543
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544int
Al Viroc7afef12006-10-19 23:29:02 -0700545nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546{
547 struct svc_procedure *proc;
548 kxdrproc_t xdr;
Al Viroad451d32006-10-19 23:28:55 -0700549 __be32 nfserr;
550 __be32 *nfserrp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
552 dprintk("nfsd_dispatch: vers %d proc %d\n",
553 rqstp->rq_vers, rqstp->rq_proc);
554 proc = rqstp->rq_procinfo;
555
556 /* Check whether we have this call in the cache. */
557 switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) {
558 case RC_INTR:
559 case RC_DROPIT:
560 return 0;
561 case RC_REPLY:
562 return 1;
563 case RC_DOIT:;
564 /* do it */
565 }
566
567 /* Decode arguments */
568 xdr = proc->pc_decode;
Al Viroad451d32006-10-19 23:28:55 -0700569 if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 rqstp->rq_argp)) {
571 dprintk("nfsd: failed to decode arguments!\n");
572 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
573 *statp = rpc_garbage_args;
574 return 1;
575 }
576
577 /* need to grab the location to store the status, as
578 * nfsv4 does some encoding while processing
579 */
580 nfserrp = rqstp->rq_res.head[0].iov_base
581 + rqstp->rq_res.head[0].iov_len;
Al Viroad451d32006-10-19 23:28:55 -0700582 rqstp->rq_res.head[0].iov_len += sizeof(__be32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
584 /* Now call the procedure handler, and encode NFS status. */
585 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
Andy Adamson32c1eb02007-07-17 04:04:48 -0700586 nfserr = map_new_errors(rqstp->rq_vers, nfserr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 if (nfserr == nfserr_dropit) {
J. Bruce Fields45457e02007-06-22 17:26:32 -0400588 dprintk("nfsd: Dropping request; may be revisited later\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
590 return 0;
591 }
592
593 if (rqstp->rq_proc != 0)
594 *nfserrp++ = nfserr;
595
596 /* Encode result.
597 * For NFSv2, additional info is never returned in case of an error.
598 */
599 if (!(nfserr && rqstp->rq_vers == 2)) {
600 xdr = proc->pc_encode;
601 if (xdr && !xdr(rqstp, nfserrp,
602 rqstp->rq_resp)) {
603 /* Failed to encode result. Release cache entry */
604 dprintk("nfsd: failed to encode result!\n");
605 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
606 *statp = rpc_system_err;
607 return 1;
608 }
609 }
610
611 /* Store reply in cache. */
612 nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);
613 return 1;
614}
Greg Banks03cf6c92009-01-13 21:26:36 +1100615
616int nfsd_pool_stats_open(struct inode *inode, struct file *file)
617{
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +0900618 int ret;
619 mutex_lock(&nfsd_mutex);
620 if (nfsd_serv == NULL) {
621 mutex_unlock(&nfsd_mutex);
Greg Banks03cf6c92009-01-13 21:26:36 +1100622 return -ENODEV;
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +0900623 }
624 /* bump up the psudo refcount while traversing */
625 svc_get(nfsd_serv);
626 ret = svc_pool_stats_open(nfsd_serv, file);
627 mutex_unlock(&nfsd_mutex);
628 return ret;
629}
630
631int nfsd_pool_stats_release(struct inode *inode, struct file *file)
632{
633 int ret = seq_release(inode, file);
634 mutex_lock(&nfsd_mutex);
635 /* this function really, really should have been called svc_put() */
636 svc_destroy(nfsd_serv);
637 mutex_unlock(&nfsd_mutex);
638 return ret;
Greg Banks03cf6c92009-01-13 21:26:36 +1100639}