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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Central processing for nfsd.
3 *
4 * Authors: Olaf Kirch (okir@monad.swb.de)
5 *
6 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
7 */
8
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +04009#include <linux/sched.h>
Rafael J. Wysocki83144182007-07-17 04:03:35 -070010#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/fs_struct.h>
Andy Adamsonc3d06f92009-04-03 08:28:18 +030012#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/sunrpc/stats.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/sunrpc/svcsock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/lockd/bind.h>
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000017#include <linux/nfsacl.h>
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +090018#include <linux/seq_file.h>
Pavel Emelyanovfc5d00b2010-09-29 16:03:50 +040019#include <net/net_namespace.h>
Boaz Harrosh9a74af22009-12-03 20:30:56 +020020#include "nfsd.h"
21#include "cache.h"
J. Bruce Fields0a3adad2009-11-04 18:12:35 -050022#include "vfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#define NFSDDBG_FACILITY NFSDDBG_SVC
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026extern struct svc_program nfsd_program;
Jeff Layton9867d762008-06-10 08:40:38 -040027static int nfsd(void *vrqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070028struct timeval nfssvc_boot;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Neil Brownbedbdd82008-06-10 08:40:35 -040030/*
31 * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members
32 * of the svc_serv struct. In particular, ->sv_nrthreads but also to some
33 * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
34 *
35 * If (out side the lock) nfsd_serv is non-NULL, then it must point to a
36 * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number
37 * of nfsd threads must exist and each must listed in ->sp_all_threads in each
38 * entry of ->sv_pools[].
39 *
40 * Transitions of the thread count between zero and non-zero are of particular
41 * interest since the svc_serv needs to be created and initialized at that
42 * point, or freed.
Jeff Layton3dd98a32008-06-10 08:40:36 -040043 *
44 * Finally, the nfsd_mutex also protects some of the global variables that are
45 * accessed when nfsd starts and that are settable via the write_* routines in
46 * nfsctl.c. In particular:
47 *
48 * user_recovery_dirname
49 * user_lease_time
50 * nfsd_versions
Neil Brownbedbdd82008-06-10 08:40:35 -040051 */
52DEFINE_MUTEX(nfsd_mutex);
53struct svc_serv *nfsd_serv;
54
Andy Adamson4bd9b0f42009-06-24 15:37:45 -040055/*
56 * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
57 * nfsd_drc_max_pages limits the total amount of memory available for
58 * version 4.1 DRC caches.
59 * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
60 */
61spinlock_t nfsd_drc_lock;
Andy Adamson0c193052009-07-27 19:09:19 -040062unsigned int nfsd_drc_max_mem;
63unsigned int nfsd_drc_mem_used;
Andy Adamson4bd9b0f42009-06-24 15:37:45 -040064
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080065#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
66static struct svc_stat nfsd_acl_svcstats;
67static struct svc_version * nfsd_acl_version[] = {
68 [2] = &nfsd_acl_version2,
69 [3] = &nfsd_acl_version3,
70};
71
72#define NFSD_ACL_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -080073#define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080074static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
75
76static struct svc_program nfsd_acl_program = {
77 .pg_prog = NFS_ACL_PROGRAM,
78 .pg_nvers = NFSD_ACL_NRVERS,
79 .pg_vers = nfsd_acl_versions,
NeilBrown1a8eff62007-01-26 00:56:58 -080080 .pg_name = "nfsacl",
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080081 .pg_class = "nfsd",
82 .pg_stats = &nfsd_acl_svcstats,
83 .pg_authenticate = &svc_set_client,
84};
85
86static struct svc_stat nfsd_acl_svcstats = {
87 .program = &nfsd_acl_program,
88};
89#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
90
NeilBrown70c3b762005-11-07 01:00:25 -080091static struct svc_version * nfsd_version[] = {
92 [2] = &nfsd_version2,
93#if defined(CONFIG_NFSD_V3)
94 [3] = &nfsd_version3,
95#endif
96#if defined(CONFIG_NFSD_V4)
97 [4] = &nfsd_version4,
98#endif
99};
100
101#define NFSD_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -0800102#define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
NeilBrown70c3b762005-11-07 01:00:25 -0800103static struct svc_version *nfsd_versions[NFSD_NRVERS];
104
105struct svc_program nfsd_program = {
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -0800106#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
107 .pg_next = &nfsd_acl_program,
108#endif
NeilBrown70c3b762005-11-07 01:00:25 -0800109 .pg_prog = NFS_PROGRAM, /* program number */
110 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
111 .pg_vers = nfsd_versions, /* version table */
112 .pg_name = "nfsd", /* program name */
113 .pg_class = "nfsd", /* authentication class */
114 .pg_stats = &nfsd_svcstats, /* version table */
115 .pg_authenticate = &svc_set_client, /* export authentication */
116
117};
118
Benny Halevy8daf2202009-04-03 08:28:59 +0300119u32 nfsd_supported_minorversion;
120
NeilBrown6658d3a2006-10-02 02:17:46 -0700121int nfsd_vers(int vers, enum vers_op change)
122{
123 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
Pavel Emelyanov15ddb4a2010-05-14 15:33:36 +0400124 return 0;
NeilBrown6658d3a2006-10-02 02:17:46 -0700125 switch(change) {
126 case NFSD_SET:
127 nfsd_versions[vers] = nfsd_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700128#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
129 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800130 nfsd_acl_versions[vers] = nfsd_acl_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700131#endif
NeilBrown1a8eff62007-01-26 00:56:58 -0800132 break;
NeilBrown6658d3a2006-10-02 02:17:46 -0700133 case NFSD_CLEAR:
134 nfsd_versions[vers] = NULL;
135#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
136 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800137 nfsd_acl_versions[vers] = NULL;
NeilBrown6658d3a2006-10-02 02:17:46 -0700138#endif
139 break;
140 case NFSD_TEST:
141 return nfsd_versions[vers] != NULL;
142 case NFSD_AVAIL:
143 return nfsd_version[vers] != NULL;
144 }
145 return 0;
146}
Benny Halevy8daf2202009-04-03 08:28:59 +0300147
148int nfsd_minorversion(u32 minorversion, enum vers_op change)
149{
150 if (minorversion > NFSD_SUPPORTED_MINOR_VERSION)
151 return -1;
152 switch(change) {
153 case NFSD_SET:
154 nfsd_supported_minorversion = minorversion;
155 break;
156 case NFSD_CLEAR:
157 if (minorversion == 0)
158 return -1;
159 nfsd_supported_minorversion = minorversion - 1;
160 break;
161 case NFSD_TEST:
162 return minorversion <= nfsd_supported_minorversion;
163 case NFSD_AVAIL:
164 return minorversion <= NFSD_SUPPORTED_MINOR_VERSION;
165 }
166 return 0;
167}
168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169/*
170 * Maximum number of nfsd processes
171 */
172#define NFSD_MAXSERVS 8192
173
174int nfsd_nrthreads(void)
175{
Neil Brownc7d106c2008-06-12 13:38:42 +1000176 int rv = 0;
177 mutex_lock(&nfsd_mutex);
178 if (nfsd_serv)
179 rv = nfsd_serv->sv_nrthreads;
180 mutex_unlock(&nfsd_mutex);
181 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182}
183
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400184static int nfsd_init_socks(int port)
185{
186 int error;
187 if (!list_empty(&nfsd_serv->sv_permsocks))
188 return 0;
189
Pavel Emelyanovfc5d00b2010-09-29 16:03:50 +0400190 error = svc_create_xprt(nfsd_serv, "udp", &init_net, PF_INET, port,
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400191 SVC_SOCK_DEFAULTS);
192 if (error < 0)
193 return error;
194
Pavel Emelyanovfc5d00b2010-09-29 16:03:50 +0400195 error = svc_create_xprt(nfsd_serv, "tcp", &init_net, PF_INET, port,
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400196 SVC_SOCK_DEFAULTS);
197 if (error < 0)
198 return error;
199
200 return 0;
201}
202
Jeff Layton4ad9a342010-07-19 16:50:04 -0400203static bool nfsd_up = false;
204
205static int nfsd_startup(unsigned short port, int nrservs)
206{
207 int ret;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400208
209 if (nfsd_up)
210 return 0;
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400211 /*
212 * Readahead param cache - will no-op if it already exists.
213 * (Note therefore results will be suboptimal if number of
214 * threads is modified after nfsd start.)
215 */
216 ret = nfsd_racache_init(2*nrservs);
217 if (ret)
218 return ret;
219 ret = nfsd_init_socks(port);
220 if (ret)
221 goto out_racache;
Jeff Laytonac77efb2010-07-20 14:10:22 -0400222 ret = lockd_up();
223 if (ret)
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400224 goto out_racache;
Jeff Layton4ad9a342010-07-19 16:50:04 -0400225 ret = nfs4_state_start();
Jeff Laytonac77efb2010-07-20 14:10:22 -0400226 if (ret)
227 goto out_lockd;
Jeff Layton4ad9a342010-07-19 16:50:04 -0400228 nfsd_up = true;
Jeff Laytonac77efb2010-07-20 14:10:22 -0400229 return 0;
230out_lockd:
231 lockd_down();
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400232out_racache:
233 nfsd_racache_shutdown();
Jeff Layton4ad9a342010-07-19 16:50:04 -0400234 return ret;
235}
236
237static void nfsd_shutdown(void)
238{
239 /*
240 * write_ports can create the server without actually starting
241 * any threads--if we get shut down before any threads are
242 * started, then nfsd_last_thread will be run before any of this
243 * other initialization has been done.
244 */
245 if (!nfsd_up)
246 return;
247 nfs4_state_shutdown();
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400248 lockd_down();
249 nfsd_racache_shutdown();
Jeff Layton4ad9a342010-07-19 16:50:04 -0400250 nfsd_up = false;
251}
252
NeilBrownbc591cc2006-10-02 02:17:44 -0700253static void nfsd_last_thread(struct svc_serv *serv)
254{
255 /* When last nfsd thread exits we need to do some clean-up */
256 nfsd_serv = NULL;
Jeff Layton4ad9a342010-07-19 16:50:04 -0400257 nfsd_shutdown();
NeilBrownbc591cc2006-10-02 02:17:44 -0700258
Jeff Laytone096bbc2008-06-10 08:40:37 -0400259 printk(KERN_WARNING "nfsd: last server has exited, flushing export "
260 "cache\n");
261 nfsd_export_flush();
NeilBrownbc591cc2006-10-02 02:17:44 -0700262}
NeilBrown6658d3a2006-10-02 02:17:46 -0700263
264void nfsd_reset_versions(void)
265{
266 int found_one = 0;
267 int i;
268
269 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
270 if (nfsd_program.pg_vers[i])
271 found_one = 1;
272 }
273
274 if (!found_one) {
275 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
276 nfsd_program.pg_vers[i] = nfsd_version[i];
277#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
278 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
279 nfsd_acl_program.pg_vers[i] =
280 nfsd_acl_version[i];
281#endif
282 }
283}
284
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300285/*
286 * Each session guarantees a negotiated per slot memory cache for replies
287 * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
288 * NFSv4.1 server might want to use more memory for a DRC than a machine
289 * with mutiple services.
290 *
291 * Impose a hard limit on the number of pages for the DRC which varies
292 * according to the machines free pages. This is of course only a default.
293 *
294 * For now this is a #defined shift which could be under admin control
295 * in the future.
296 */
297static void set_max_drc(void)
298{
Andy Adamson6a14dd12009-07-27 19:06:45 -0400299 #define NFSD_DRC_SIZE_SHIFT 10
Andy Adamson0c193052009-07-27 19:09:19 -0400300 nfsd_drc_max_mem = (nr_free_buffer_pages()
301 >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
302 nfsd_drc_mem_used = 0;
Andy Adamson4bd9b0f42009-06-24 15:37:45 -0400303 spin_lock_init(&nfsd_drc_lock);
Andy Adamson0c193052009-07-27 19:09:19 -0400304 dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem);
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300305}
Neil Brownbedbdd82008-06-10 08:40:35 -0400306
NeilBrownb41b66d2006-10-02 02:17:48 -0700307int nfsd_create_serv(void)
NeilBrown02a375f2006-10-02 02:17:46 -0700308{
309 int err = 0;
Neil Brownbedbdd82008-06-10 08:40:35 -0400310
311 WARN_ON(!mutex_is_locked(&nfsd_mutex));
NeilBrown02a375f2006-10-02 02:17:46 -0700312 if (nfsd_serv) {
Greg Banks9a24ab52006-10-02 02:17:58 -0700313 svc_get(nfsd_serv);
NeilBrown02a375f2006-10-02 02:17:46 -0700314 return 0;
315 }
NeilBrown596bbe52006-10-04 02:15:48 -0700316 if (nfsd_max_blksize == 0) {
317 /* choose a suitable default */
318 struct sysinfo i;
319 si_meminfo(&i);
320 /* Aim for 1/4096 of memory per thread
321 * This gives 1MB on 4Gig machines
322 * But only uses 32K on 128M machines.
323 * Bottom out at 8K on 32M and smaller.
324 * Of course, this is only a default.
325 */
326 nfsd_max_blksize = NFSSVC_MAXBLKSIZE;
NeilBrown44c55602006-10-04 02:16:15 -0700327 i.totalram <<= PAGE_SHIFT - 12;
NeilBrown596bbe52006-10-04 02:15:48 -0700328 while (nfsd_max_blksize > i.totalram &&
329 nfsd_max_blksize >= 8*1024*2)
330 nfsd_max_blksize /= 2;
331 }
J. Bruce Fieldse844a7b2010-08-06 15:48:03 -0400332 nfsd_reset_versions();
NeilBrown02a375f2006-10-02 02:17:46 -0700333
Jeff Laytone096bbc2008-06-10 08:40:37 -0400334 nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
Jeff Laytona75c5d02008-06-10 08:40:39 -0400335 nfsd_last_thread, nfsd, THIS_MODULE);
NeilBrown02a375f2006-10-02 02:17:46 -0700336 if (nfsd_serv == NULL)
Jeff Layton628b3682010-07-21 16:40:08 -0400337 return -ENOMEM;
Neil Brownbedbdd82008-06-10 08:40:35 -0400338
Jeff Layton628b3682010-07-21 16:40:08 -0400339 set_max_drc();
NeilBrown02a375f2006-10-02 02:17:46 -0700340 do_gettimeofday(&nfssvc_boot); /* record boot time */
341 return err;
342}
343
Greg Bankseed29652006-10-02 02:18:02 -0700344int nfsd_nrpools(void)
345{
346 if (nfsd_serv == NULL)
347 return 0;
348 else
349 return nfsd_serv->sv_nrpools;
350}
351
352int nfsd_get_nrthreads(int n, int *nthreads)
353{
354 int i = 0;
355
356 if (nfsd_serv != NULL) {
357 for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++)
358 nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads;
359 }
360
361 return 0;
362}
363
364int nfsd_set_nrthreads(int n, int *nthreads)
365{
366 int i = 0;
367 int tot = 0;
368 int err = 0;
369
Neil Brownbedbdd82008-06-10 08:40:35 -0400370 WARN_ON(!mutex_is_locked(&nfsd_mutex));
371
Greg Bankseed29652006-10-02 02:18:02 -0700372 if (nfsd_serv == NULL || n <= 0)
373 return 0;
374
375 if (n > nfsd_serv->sv_nrpools)
376 n = nfsd_serv->sv_nrpools;
377
378 /* enforce a global maximum number of threads */
379 tot = 0;
380 for (i = 0; i < n; i++) {
381 if (nthreads[i] > NFSD_MAXSERVS)
382 nthreads[i] = NFSD_MAXSERVS;
383 tot += nthreads[i];
384 }
385 if (tot > NFSD_MAXSERVS) {
386 /* total too large: scale down requested numbers */
387 for (i = 0; i < n && tot > 0; i++) {
388 int new = nthreads[i] * NFSD_MAXSERVS / tot;
389 tot -= (nthreads[i] - new);
390 nthreads[i] = new;
391 }
392 for (i = 0; i < n && tot > 0; i++) {
393 nthreads[i]--;
394 tot--;
395 }
396 }
397
398 /*
399 * There must always be a thread in pool 0; the admin
400 * can't shut down NFS completely using pool_threads.
401 */
402 if (nthreads[0] == 0)
403 nthreads[0] = 1;
404
405 /* apply the new numbers */
Greg Bankseed29652006-10-02 02:18:02 -0700406 svc_get(nfsd_serv);
407 for (i = 0; i < n; i++) {
408 err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i],
409 nthreads[i]);
410 if (err)
411 break;
412 }
413 svc_destroy(nfsd_serv);
Greg Bankseed29652006-10-02 02:18:02 -0700414
415 return err;
416}
417
Jeff Laytonac77efb2010-07-20 14:10:22 -0400418/*
419 * Adjust the number of threads and return the new number of threads.
420 * This is also the function that starts the server if necessary, if
421 * this is the first time nrservs is nonzero.
422 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423int
424nfsd_svc(unsigned short port, int nrservs)
425{
426 int error;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400427 bool nfsd_up_before;
Neil Brownbedbdd82008-06-10 08:40:35 -0400428
429 mutex_lock(&nfsd_mutex);
NeilBrown6658d3a2006-10-02 02:17:46 -0700430 dprintk("nfsd: creating service\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (nrservs <= 0)
432 nrservs = 0;
433 if (nrservs > NFSD_MAXSERVS)
434 nrservs = NFSD_MAXSERVS;
NeilBrown671e1fc2009-06-16 11:03:20 +1000435 error = 0;
436 if (nrservs == 0 && nfsd_serv == NULL)
437 goto out;
438
NeilBrown02a375f2006-10-02 02:17:46 -0700439 error = nfsd_create_serv();
NeilBrown02a375f2006-10-02 02:17:46 -0700440 if (error)
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400441 goto out;
442
443 nfsd_up_before = nfsd_up;
444
445 error = nfsd_startup(port, nrservs);
J. Bruce Fieldsaf4718f2010-07-21 18:31:42 -0400446 if (error)
447 goto out_destroy;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400448 error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
449 if (error)
450 goto out_shutdown;
J. Bruce Fieldsaf4718f2010-07-21 18:31:42 -0400451 /* We are holding a reference to nfsd_serv which
452 * we don't want to count in the return value,
453 * so subtract 1
454 */
455 error = nfsd_serv->sv_nrthreads - 1;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400456out_shutdown:
457 if (error < 0 && !nfsd_up_before)
458 nfsd_shutdown();
Jeff Layton4ad9a342010-07-19 16:50:04 -0400459out_destroy:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 svc_destroy(nfsd_serv); /* Release server */
Jeff Layton4ad9a342010-07-19 16:50:04 -0400461out:
Neil Brownbedbdd82008-06-10 08:40:35 -0400462 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 return error;
464}
465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
467/*
468 * This is the NFS server kernel thread
469 */
Jeff Layton9867d762008-06-10 08:40:38 -0400470static int
471nfsd(void *vrqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472{
Jeff Layton9867d762008-06-10 08:40:38 -0400473 struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
Jeff Layton9867d762008-06-10 08:40:38 -0400474 int err, preverr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476 /* Lock module and set up kernel thread */
Neil Brownbedbdd82008-06-10 08:40:35 -0400477 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
Jeff Layton9867d762008-06-10 08:40:38 -0400479 /* At this point, the thread shares current->fs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 * with the init process. We need to create files with a
481 * umask of 0 instead of init's umask. */
Al Viro3e93cd62009-03-29 19:00:13 -0400482 if (unshare_fs_struct() < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 printk("Unable to start nfsd thread: out of memory\n");
484 goto out;
485 }
Al Viro3e93cd62009-03-29 19:00:13 -0400486
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 current->fs->umask = 0;
488
Jeff Layton9867d762008-06-10 08:40:38 -0400489 /*
490 * thread is spawned with all signals set to SIG_IGN, re-enable
Jeff Layton100766f2008-06-30 14:09:46 -0400491 * the ones that will bring down the thread
Jeff Layton9867d762008-06-10 08:40:38 -0400492 */
Jeff Layton100766f2008-06-30 14:09:46 -0400493 allow_signal(SIGKILL);
494 allow_signal(SIGHUP);
495 allow_signal(SIGINT);
496 allow_signal(SIGQUIT);
Neil Brownbedbdd82008-06-10 08:40:35 -0400497
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 nfsdstats.th_cnt++;
Neil Brownbedbdd82008-06-10 08:40:35 -0400499 mutex_unlock(&nfsd_mutex);
500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 /*
502 * We want less throttling in balance_dirty_pages() so that nfs to
503 * localhost doesn't cause nfsd to lock up due to all the client's
504 * dirty pages.
505 */
506 current->flags |= PF_LESS_THROTTLE;
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700507 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 /*
510 * The main request loop
511 */
512 for (;;) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 /*
514 * Find a socket with data available and call its
515 * recvfrom routine.
516 */
NeilBrown6fb2b472006-10-02 02:17:50 -0700517 while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 ;
Jeff Layton9867d762008-06-10 08:40:38 -0400519 if (err == -EINTR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 break;
Jeff Layton9867d762008-06-10 08:40:38 -0400521 else if (err < 0) {
522 if (err != preverr) {
523 printk(KERN_WARNING "%s: unexpected error "
524 "from svc_recv (%d)\n", __func__, -err);
525 preverr = err;
526 }
527 schedule_timeout_uninterruptible(HZ);
528 continue;
529 }
530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
532 /* Lock the export hash tables for reading. */
533 exp_readlock();
534
David Howellse0e81732009-09-02 09:13:40 +0100535 validate_process_creds();
NeilBrown6fb2b472006-10-02 02:17:50 -0700536 svc_process(rqstp);
David Howellse0e81732009-09-02 09:13:40 +0100537 validate_process_creds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539 /* Unlock export hash tables */
540 exp_readunlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 }
542
NeilBrown24e36662006-10-02 02:17:45 -0700543 /* Clear signals before calling svc_exit_thread() */
NeilBrown9e4160522005-04-16 15:26:37 -0700544 flush_signals(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Neil Brownbedbdd82008-06-10 08:40:35 -0400546 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 nfsdstats.th_cnt --;
548
549out:
550 /* Release the thread */
551 svc_exit_thread(rqstp);
552
553 /* Release module */
Neil Brownbedbdd82008-06-10 08:40:35 -0400554 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 module_put_and_exit(0);
Jeff Layton9867d762008-06-10 08:40:38 -0400556 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
558
Andy Adamson32c1eb02007-07-17 04:04:48 -0700559static __be32 map_new_errors(u32 vers, __be32 nfserr)
560{
561 if (nfserr == nfserr_jukebox && vers == 2)
562 return nfserr_dropit;
563 if (nfserr == nfserr_wrongsec && vers < 4)
564 return nfserr_acces;
565 return nfserr;
566}
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568int
Al Viroc7afef12006-10-19 23:29:02 -0700569nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570{
571 struct svc_procedure *proc;
572 kxdrproc_t xdr;
Al Viroad451d32006-10-19 23:28:55 -0700573 __be32 nfserr;
574 __be32 *nfserrp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
576 dprintk("nfsd_dispatch: vers %d proc %d\n",
577 rqstp->rq_vers, rqstp->rq_proc);
578 proc = rqstp->rq_procinfo;
579
580 /* Check whether we have this call in the cache. */
581 switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) {
582 case RC_INTR:
583 case RC_DROPIT:
584 return 0;
585 case RC_REPLY:
586 return 1;
587 case RC_DOIT:;
588 /* do it */
589 }
590
591 /* Decode arguments */
592 xdr = proc->pc_decode;
Al Viroad451d32006-10-19 23:28:55 -0700593 if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 rqstp->rq_argp)) {
595 dprintk("nfsd: failed to decode arguments!\n");
596 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
597 *statp = rpc_garbage_args;
598 return 1;
599 }
600
601 /* need to grab the location to store the status, as
602 * nfsv4 does some encoding while processing
603 */
604 nfserrp = rqstp->rq_res.head[0].iov_base
605 + rqstp->rq_res.head[0].iov_len;
Al Viroad451d32006-10-19 23:28:55 -0700606 rqstp->rq_res.head[0].iov_len += sizeof(__be32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
608 /* Now call the procedure handler, and encode NFS status. */
609 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
Andy Adamson32c1eb02007-07-17 04:04:48 -0700610 nfserr = map_new_errors(rqstp->rq_vers, nfserr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 if (nfserr == nfserr_dropit) {
J. Bruce Fields45457e02007-06-22 17:26:32 -0400612 dprintk("nfsd: Dropping request; may be revisited later\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
614 return 0;
615 }
616
617 if (rqstp->rq_proc != 0)
618 *nfserrp++ = nfserr;
619
620 /* Encode result.
621 * For NFSv2, additional info is never returned in case of an error.
622 */
623 if (!(nfserr && rqstp->rq_vers == 2)) {
624 xdr = proc->pc_encode;
625 if (xdr && !xdr(rqstp, nfserrp,
626 rqstp->rq_resp)) {
627 /* Failed to encode result. Release cache entry */
628 dprintk("nfsd: failed to encode result!\n");
629 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
630 *statp = rpc_system_err;
631 return 1;
632 }
633 }
634
635 /* Store reply in cache. */
636 nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);
637 return 1;
638}
Greg Banks03cf6c92009-01-13 21:26:36 +1100639
640int nfsd_pool_stats_open(struct inode *inode, struct file *file)
641{
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +0900642 int ret;
643 mutex_lock(&nfsd_mutex);
644 if (nfsd_serv == NULL) {
645 mutex_unlock(&nfsd_mutex);
Greg Banks03cf6c92009-01-13 21:26:36 +1100646 return -ENODEV;
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +0900647 }
648 /* bump up the psudo refcount while traversing */
649 svc_get(nfsd_serv);
650 ret = svc_pool_stats_open(nfsd_serv, file);
651 mutex_unlock(&nfsd_mutex);
652 return ret;
653}
654
655int nfsd_pool_stats_release(struct inode *inode, struct file *file)
656{
657 int ret = seq_release(inode, file);
658 mutex_lock(&nfsd_mutex);
659 /* this function really, really should have been called svc_put() */
660 svc_destroy(nfsd_serv);
661 mutex_unlock(&nfsd_mutex);
662 return ret;
Greg Banks03cf6c92009-01-13 21:26:36 +1100663}