blob: eda7d7e55e05c45aa309f1465f60368bf3f00242 [file] [log] [blame]
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>
Paul Gortmaker143cb492011-07-01 14:23:34 -040011#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/fs_struct.h>
Andy Adamsonc3d06f92009-04-03 08:28:18 +030013#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/sunrpc/stats.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/sunrpc/svcsock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/lockd/bind.h>
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000018#include <linux/nfsacl.h>
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +090019#include <linux/seq_file.h>
Pavel Emelyanovfc5d00b2010-09-29 16:03:50 +040020#include <net/net_namespace.h>
Boaz Harrosh9a74af22009-12-03 20:30:56 +020021#include "nfsd.h"
22#include "cache.h"
J. Bruce Fields0a3adad2009-11-04 18:12:35 -050023#include "vfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#define NFSDDBG_FACILITY NFSDDBG_SVC
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027extern struct svc_program nfsd_program;
Jeff Layton9867d762008-06-10 08:40:38 -040028static int nfsd(void *vrqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070029struct timeval nfssvc_boot;
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Neil Brownbedbdd82008-06-10 08:40:35 -040031/*
32 * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members
33 * of the svc_serv struct. In particular, ->sv_nrthreads but also to some
34 * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
35 *
36 * If (out side the lock) nfsd_serv is non-NULL, then it must point to a
37 * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number
38 * of nfsd threads must exist and each must listed in ->sp_all_threads in each
39 * entry of ->sv_pools[].
40 *
41 * Transitions of the thread count between zero and non-zero are of particular
42 * interest since the svc_serv needs to be created and initialized at that
43 * point, or freed.
Jeff Layton3dd98a32008-06-10 08:40:36 -040044 *
45 * Finally, the nfsd_mutex also protects some of the global variables that are
46 * accessed when nfsd starts and that are settable via the write_* routines in
47 * nfsctl.c. In particular:
48 *
49 * user_recovery_dirname
50 * user_lease_time
51 * nfsd_versions
Neil Brownbedbdd82008-06-10 08:40:35 -040052 */
53DEFINE_MUTEX(nfsd_mutex);
54struct svc_serv *nfsd_serv;
55
Andy Adamson4bd9b0f42009-06-24 15:37:45 -040056/*
57 * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
58 * nfsd_drc_max_pages limits the total amount of memory available for
59 * version 4.1 DRC caches.
60 * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
61 */
62spinlock_t nfsd_drc_lock;
Andy Adamson0c193052009-07-27 19:09:19 -040063unsigned int nfsd_drc_max_mem;
64unsigned int nfsd_drc_mem_used;
Andy Adamson4bd9b0f42009-06-24 15:37:45 -040065
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080066#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
67static struct svc_stat nfsd_acl_svcstats;
68static struct svc_version * nfsd_acl_version[] = {
69 [2] = &nfsd_acl_version2,
70 [3] = &nfsd_acl_version3,
71};
72
73#define NFSD_ACL_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -080074#define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080075static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
76
77static struct svc_program nfsd_acl_program = {
78 .pg_prog = NFS_ACL_PROGRAM,
79 .pg_nvers = NFSD_ACL_NRVERS,
80 .pg_vers = nfsd_acl_versions,
NeilBrown1a8eff62007-01-26 00:56:58 -080081 .pg_name = "nfsacl",
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080082 .pg_class = "nfsd",
83 .pg_stats = &nfsd_acl_svcstats,
84 .pg_authenticate = &svc_set_client,
85};
86
87static struct svc_stat nfsd_acl_svcstats = {
88 .program = &nfsd_acl_program,
89};
90#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
91
NeilBrown70c3b762005-11-07 01:00:25 -080092static struct svc_version * nfsd_version[] = {
93 [2] = &nfsd_version2,
94#if defined(CONFIG_NFSD_V3)
95 [3] = &nfsd_version3,
96#endif
97#if defined(CONFIG_NFSD_V4)
98 [4] = &nfsd_version4,
99#endif
100};
101
102#define NFSD_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -0800103#define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
NeilBrown70c3b762005-11-07 01:00:25 -0800104static struct svc_version *nfsd_versions[NFSD_NRVERS];
105
106struct svc_program nfsd_program = {
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -0800107#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
108 .pg_next = &nfsd_acl_program,
109#endif
NeilBrown70c3b762005-11-07 01:00:25 -0800110 .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 */
117
118};
119
Benny Halevy8daf2202009-04-03 08:28:59 +0300120u32 nfsd_supported_minorversion;
121
NeilBrown6658d3a2006-10-02 02:17:46 -0700122int nfsd_vers(int vers, enum vers_op change)
123{
124 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
Pavel Emelyanov15ddb4a2010-05-14 15:33:36 +0400125 return 0;
NeilBrown6658d3a2006-10-02 02:17:46 -0700126 switch(change) {
127 case NFSD_SET:
128 nfsd_versions[vers] = nfsd_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700129#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
130 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800131 nfsd_acl_versions[vers] = nfsd_acl_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700132#endif
NeilBrown1a8eff62007-01-26 00:56:58 -0800133 break;
NeilBrown6658d3a2006-10-02 02:17:46 -0700134 case NFSD_CLEAR:
135 nfsd_versions[vers] = NULL;
136#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
137 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800138 nfsd_acl_versions[vers] = NULL;
NeilBrown6658d3a2006-10-02 02:17:46 -0700139#endif
140 break;
141 case NFSD_TEST:
142 return nfsd_versions[vers] != NULL;
143 case NFSD_AVAIL:
144 return nfsd_version[vers] != NULL;
145 }
146 return 0;
147}
Benny Halevy8daf2202009-04-03 08:28:59 +0300148
149int nfsd_minorversion(u32 minorversion, enum vers_op change)
150{
151 if (minorversion > NFSD_SUPPORTED_MINOR_VERSION)
152 return -1;
153 switch(change) {
154 case NFSD_SET:
155 nfsd_supported_minorversion = minorversion;
156 break;
157 case NFSD_CLEAR:
158 if (minorversion == 0)
159 return -1;
160 nfsd_supported_minorversion = minorversion - 1;
161 break;
162 case NFSD_TEST:
163 return minorversion <= nfsd_supported_minorversion;
164 case NFSD_AVAIL:
165 return minorversion <= NFSD_SUPPORTED_MINOR_VERSION;
166 }
167 return 0;
168}
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170/*
171 * Maximum number of nfsd processes
172 */
173#define NFSD_MAXSERVS 8192
174
175int nfsd_nrthreads(void)
176{
Neil Brownc7d106c2008-06-12 13:38:42 +1000177 int rv = 0;
178 mutex_lock(&nfsd_mutex);
179 if (nfsd_serv)
180 rv = nfsd_serv->sv_nrthreads;
181 mutex_unlock(&nfsd_mutex);
182 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400185static int nfsd_init_socks(int port)
186{
187 int error;
188 if (!list_empty(&nfsd_serv->sv_permsocks))
189 return 0;
190
Pavel Emelyanovfc5d00b2010-09-29 16:03:50 +0400191 error = svc_create_xprt(nfsd_serv, "udp", &init_net, PF_INET, port,
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400192 SVC_SOCK_DEFAULTS);
193 if (error < 0)
194 return error;
195
Pavel Emelyanovfc5d00b2010-09-29 16:03:50 +0400196 error = svc_create_xprt(nfsd_serv, "tcp", &init_net, PF_INET, port,
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400197 SVC_SOCK_DEFAULTS);
198 if (error < 0)
199 return error;
200
201 return 0;
202}
203
Jeff Layton4ad9a342010-07-19 16:50:04 -0400204static bool nfsd_up = false;
205
206static int nfsd_startup(unsigned short port, int nrservs)
207{
208 int ret;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400209
210 if (nfsd_up)
211 return 0;
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400212 /*
213 * Readahead param cache - will no-op if it already exists.
214 * (Note therefore results will be suboptimal if number of
215 * threads is modified after nfsd start.)
216 */
217 ret = nfsd_racache_init(2*nrservs);
218 if (ret)
219 return ret;
220 ret = nfsd_init_socks(port);
221 if (ret)
222 goto out_racache;
Jeff Laytonac77efb2010-07-20 14:10:22 -0400223 ret = lockd_up();
224 if (ret)
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400225 goto out_racache;
Jeff Layton4ad9a342010-07-19 16:50:04 -0400226 ret = nfs4_state_start();
Jeff Laytonac77efb2010-07-20 14:10:22 -0400227 if (ret)
228 goto out_lockd;
Jeff Layton4ad9a342010-07-19 16:50:04 -0400229 nfsd_up = true;
Jeff Laytonac77efb2010-07-20 14:10:22 -0400230 return 0;
231out_lockd:
232 lockd_down();
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400233out_racache:
234 nfsd_racache_shutdown();
Jeff Layton4ad9a342010-07-19 16:50:04 -0400235 return ret;
236}
237
238static void nfsd_shutdown(void)
239{
240 /*
241 * write_ports can create the server without actually starting
242 * any threads--if we get shut down before any threads are
243 * started, then nfsd_last_thread will be run before any of this
244 * other initialization has been done.
245 */
246 if (!nfsd_up)
247 return;
248 nfs4_state_shutdown();
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400249 lockd_down();
250 nfsd_racache_shutdown();
Jeff Layton4ad9a342010-07-19 16:50:04 -0400251 nfsd_up = false;
252}
253
NeilBrownbc591cc2006-10-02 02:17:44 -0700254static void nfsd_last_thread(struct svc_serv *serv)
255{
256 /* When last nfsd thread exits we need to do some clean-up */
257 nfsd_serv = NULL;
Jeff Layton4ad9a342010-07-19 16:50:04 -0400258 nfsd_shutdown();
NeilBrownbc591cc2006-10-02 02:17:44 -0700259
Stanislav Kinsbursky16d05872011-10-25 14:17:28 +0300260 svc_rpcb_cleanup(serv);
261
Jeff Laytone096bbc2008-06-10 08:40:37 -0400262 printk(KERN_WARNING "nfsd: last server has exited, flushing export "
263 "cache\n");
264 nfsd_export_flush();
NeilBrownbc591cc2006-10-02 02:17:44 -0700265}
NeilBrown6658d3a2006-10-02 02:17:46 -0700266
267void nfsd_reset_versions(void)
268{
269 int found_one = 0;
270 int i;
271
272 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
273 if (nfsd_program.pg_vers[i])
274 found_one = 1;
275 }
276
277 if (!found_one) {
278 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
279 nfsd_program.pg_vers[i] = nfsd_version[i];
280#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
281 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
282 nfsd_acl_program.pg_vers[i] =
283 nfsd_acl_version[i];
284#endif
285 }
286}
287
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300288/*
289 * Each session guarantees a negotiated per slot memory cache for replies
290 * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
291 * NFSv4.1 server might want to use more memory for a DRC than a machine
292 * with mutiple services.
293 *
294 * Impose a hard limit on the number of pages for the DRC which varies
295 * according to the machines free pages. This is of course only a default.
296 *
297 * For now this is a #defined shift which could be under admin control
298 * in the future.
299 */
300static void set_max_drc(void)
301{
Andy Adamson6a14dd12009-07-27 19:06:45 -0400302 #define NFSD_DRC_SIZE_SHIFT 10
Andy Adamson0c193052009-07-27 19:09:19 -0400303 nfsd_drc_max_mem = (nr_free_buffer_pages()
304 >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
305 nfsd_drc_mem_used = 0;
Andy Adamson4bd9b0f42009-06-24 15:37:45 -0400306 spin_lock_init(&nfsd_drc_lock);
Andy Adamson0c193052009-07-27 19:09:19 -0400307 dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem);
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300308}
Neil Brownbedbdd82008-06-10 08:40:35 -0400309
NeilBrownb41b66d2006-10-02 02:17:48 -0700310int nfsd_create_serv(void)
NeilBrown02a375f2006-10-02 02:17:46 -0700311{
312 int err = 0;
Neil Brownbedbdd82008-06-10 08:40:35 -0400313
314 WARN_ON(!mutex_is_locked(&nfsd_mutex));
NeilBrown02a375f2006-10-02 02:17:46 -0700315 if (nfsd_serv) {
Greg Banks9a24ab52006-10-02 02:17:58 -0700316 svc_get(nfsd_serv);
NeilBrown02a375f2006-10-02 02:17:46 -0700317 return 0;
318 }
NeilBrown596bbe52006-10-04 02:15:48 -0700319 if (nfsd_max_blksize == 0) {
320 /* choose a suitable default */
321 struct sysinfo i;
322 si_meminfo(&i);
323 /* Aim for 1/4096 of memory per thread
324 * This gives 1MB on 4Gig machines
325 * But only uses 32K on 128M machines.
326 * Bottom out at 8K on 32M and smaller.
327 * Of course, this is only a default.
328 */
329 nfsd_max_blksize = NFSSVC_MAXBLKSIZE;
NeilBrown44c55602006-10-04 02:16:15 -0700330 i.totalram <<= PAGE_SHIFT - 12;
NeilBrown596bbe52006-10-04 02:15:48 -0700331 while (nfsd_max_blksize > i.totalram &&
332 nfsd_max_blksize >= 8*1024*2)
333 nfsd_max_blksize /= 2;
334 }
J. Bruce Fieldse844a7b2010-08-06 15:48:03 -0400335 nfsd_reset_versions();
NeilBrown02a375f2006-10-02 02:17:46 -0700336
Jeff Laytone096bbc2008-06-10 08:40:37 -0400337 nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
Jeff Laytona75c5d02008-06-10 08:40:39 -0400338 nfsd_last_thread, nfsd, THIS_MODULE);
NeilBrown02a375f2006-10-02 02:17:46 -0700339 if (nfsd_serv == NULL)
Jeff Layton628b3682010-07-21 16:40:08 -0400340 return -ENOMEM;
Neil Brownbedbdd82008-06-10 08:40:35 -0400341
Jeff Layton628b3682010-07-21 16:40:08 -0400342 set_max_drc();
NeilBrown02a375f2006-10-02 02:17:46 -0700343 do_gettimeofday(&nfssvc_boot); /* record boot time */
344 return err;
345}
346
Greg Bankseed29652006-10-02 02:18:02 -0700347int nfsd_nrpools(void)
348{
349 if (nfsd_serv == NULL)
350 return 0;
351 else
352 return nfsd_serv->sv_nrpools;
353}
354
355int nfsd_get_nrthreads(int n, int *nthreads)
356{
357 int i = 0;
358
359 if (nfsd_serv != NULL) {
360 for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++)
361 nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads;
362 }
363
364 return 0;
365}
366
367int nfsd_set_nrthreads(int n, int *nthreads)
368{
369 int i = 0;
370 int tot = 0;
371 int err = 0;
372
Neil Brownbedbdd82008-06-10 08:40:35 -0400373 WARN_ON(!mutex_is_locked(&nfsd_mutex));
374
Greg Bankseed29652006-10-02 02:18:02 -0700375 if (nfsd_serv == NULL || n <= 0)
376 return 0;
377
378 if (n > nfsd_serv->sv_nrpools)
379 n = nfsd_serv->sv_nrpools;
380
381 /* enforce a global maximum number of threads */
382 tot = 0;
383 for (i = 0; i < n; i++) {
384 if (nthreads[i] > NFSD_MAXSERVS)
385 nthreads[i] = NFSD_MAXSERVS;
386 tot += nthreads[i];
387 }
388 if (tot > NFSD_MAXSERVS) {
389 /* total too large: scale down requested numbers */
390 for (i = 0; i < n && tot > 0; i++) {
391 int new = nthreads[i] * NFSD_MAXSERVS / tot;
392 tot -= (nthreads[i] - new);
393 nthreads[i] = new;
394 }
395 for (i = 0; i < n && tot > 0; i++) {
396 nthreads[i]--;
397 tot--;
398 }
399 }
400
401 /*
402 * There must always be a thread in pool 0; the admin
403 * can't shut down NFS completely using pool_threads.
404 */
405 if (nthreads[0] == 0)
406 nthreads[0] = 1;
407
408 /* apply the new numbers */
Greg Bankseed29652006-10-02 02:18:02 -0700409 svc_get(nfsd_serv);
410 for (i = 0; i < n; i++) {
411 err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i],
412 nthreads[i]);
413 if (err)
414 break;
415 }
416 svc_destroy(nfsd_serv);
Greg Bankseed29652006-10-02 02:18:02 -0700417
418 return err;
419}
420
Jeff Laytonac77efb2010-07-20 14:10:22 -0400421/*
422 * Adjust the number of threads and return the new number of threads.
423 * This is also the function that starts the server if necessary, if
424 * this is the first time nrservs is nonzero.
425 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426int
427nfsd_svc(unsigned short port, int nrservs)
428{
429 int error;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400430 bool nfsd_up_before;
Neil Brownbedbdd82008-06-10 08:40:35 -0400431
432 mutex_lock(&nfsd_mutex);
NeilBrown6658d3a2006-10-02 02:17:46 -0700433 dprintk("nfsd: creating service\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 if (nrservs <= 0)
435 nrservs = 0;
436 if (nrservs > NFSD_MAXSERVS)
437 nrservs = NFSD_MAXSERVS;
NeilBrown671e1fc2009-06-16 11:03:20 +1000438 error = 0;
439 if (nrservs == 0 && nfsd_serv == NULL)
440 goto out;
441
NeilBrown02a375f2006-10-02 02:17:46 -0700442 error = nfsd_create_serv();
NeilBrown02a375f2006-10-02 02:17:46 -0700443 if (error)
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400444 goto out;
445
446 nfsd_up_before = nfsd_up;
447
448 error = nfsd_startup(port, nrservs);
J. Bruce Fieldsaf4718f2010-07-21 18:31:42 -0400449 if (error)
450 goto out_destroy;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400451 error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
452 if (error)
453 goto out_shutdown;
J. Bruce Fieldsaf4718f2010-07-21 18:31:42 -0400454 /* We are holding a reference to nfsd_serv which
455 * we don't want to count in the return value,
456 * so subtract 1
457 */
458 error = nfsd_serv->sv_nrthreads - 1;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400459out_shutdown:
460 if (error < 0 && !nfsd_up_before)
461 nfsd_shutdown();
Jeff Layton4ad9a342010-07-19 16:50:04 -0400462out_destroy:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 svc_destroy(nfsd_serv); /* Release server */
Jeff Layton4ad9a342010-07-19 16:50:04 -0400464out:
Neil Brownbedbdd82008-06-10 08:40:35 -0400465 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 return error;
467}
468
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
470/*
471 * This is the NFS server kernel thread
472 */
Jeff Layton9867d762008-06-10 08:40:38 -0400473static int
474nfsd(void *vrqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475{
Jeff Layton9867d762008-06-10 08:40:38 -0400476 struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
Jeff Layton9867d762008-06-10 08:40:38 -0400477 int err, preverr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479 /* Lock module and set up kernel thread */
Neil Brownbedbdd82008-06-10 08:40:35 -0400480 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
Jeff Layton9867d762008-06-10 08:40:38 -0400482 /* At this point, the thread shares current->fs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 * with the init process. We need to create files with a
484 * umask of 0 instead of init's umask. */
Al Viro3e93cd62009-03-29 19:00:13 -0400485 if (unshare_fs_struct() < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 printk("Unable to start nfsd thread: out of memory\n");
487 goto out;
488 }
Al Viro3e93cd62009-03-29 19:00:13 -0400489
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 current->fs->umask = 0;
491
Jeff Layton9867d762008-06-10 08:40:38 -0400492 /*
493 * thread is spawned with all signals set to SIG_IGN, re-enable
Jeff Layton100766f2008-06-30 14:09:46 -0400494 * the ones that will bring down the thread
Jeff Layton9867d762008-06-10 08:40:38 -0400495 */
Jeff Layton100766f2008-06-30 14:09:46 -0400496 allow_signal(SIGKILL);
497 allow_signal(SIGHUP);
498 allow_signal(SIGINT);
499 allow_signal(SIGQUIT);
Neil Brownbedbdd82008-06-10 08:40:35 -0400500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 nfsdstats.th_cnt++;
Neil Brownbedbdd82008-06-10 08:40:35 -0400502 mutex_unlock(&nfsd_mutex);
503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 /*
505 * We want less throttling in balance_dirty_pages() so that nfs to
506 * localhost doesn't cause nfsd to lock up due to all the client's
507 * dirty pages.
508 */
509 current->flags |= PF_LESS_THROTTLE;
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700510 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511
512 /*
513 * The main request loop
514 */
515 for (;;) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 /*
517 * Find a socket with data available and call its
518 * recvfrom routine.
519 */
NeilBrown6fb2b472006-10-02 02:17:50 -0700520 while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 ;
Jeff Layton9867d762008-06-10 08:40:38 -0400522 if (err == -EINTR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 break;
Jeff Layton9867d762008-06-10 08:40:38 -0400524 else if (err < 0) {
525 if (err != preverr) {
526 printk(KERN_WARNING "%s: unexpected error "
527 "from svc_recv (%d)\n", __func__, -err);
528 preverr = err;
529 }
530 schedule_timeout_uninterruptible(HZ);
531 continue;
532 }
533
David Howellse0e81732009-09-02 09:13:40 +0100534 validate_process_creds();
NeilBrown6fb2b472006-10-02 02:17:50 -0700535 svc_process(rqstp);
David Howellse0e81732009-09-02 09:13:40 +0100536 validate_process_creds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 }
538
NeilBrown24e36662006-10-02 02:17:45 -0700539 /* Clear signals before calling svc_exit_thread() */
NeilBrown9e4160522005-04-16 15:26:37 -0700540 flush_signals(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
Neil Brownbedbdd82008-06-10 08:40:35 -0400542 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 nfsdstats.th_cnt --;
544
545out:
546 /* Release the thread */
547 svc_exit_thread(rqstp);
548
549 /* Release module */
Neil Brownbedbdd82008-06-10 08:40:35 -0400550 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 module_put_and_exit(0);
Jeff Layton9867d762008-06-10 08:40:38 -0400552 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
554
Andy Adamson32c1eb02007-07-17 04:04:48 -0700555static __be32 map_new_errors(u32 vers, __be32 nfserr)
556{
557 if (nfserr == nfserr_jukebox && vers == 2)
558 return nfserr_dropit;
559 if (nfserr == nfserr_wrongsec && vers < 4)
560 return nfserr_acces;
561 return nfserr;
562}
563
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564int
Al Viroc7afef12006-10-19 23:29:02 -0700565nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566{
567 struct svc_procedure *proc;
568 kxdrproc_t xdr;
Al Viroad451d32006-10-19 23:28:55 -0700569 __be32 nfserr;
570 __be32 *nfserrp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
572 dprintk("nfsd_dispatch: vers %d proc %d\n",
573 rqstp->rq_vers, rqstp->rq_proc);
574 proc = rqstp->rq_procinfo;
575
J. Bruce Fields10910062011-01-24 12:11:02 -0500576 /*
577 * Give the xdr decoder a chance to change this if it wants
578 * (necessary in the NFSv4.0 compound case)
579 */
580 rqstp->rq_cachetype = proc->pc_cachetype;
581 /* Decode arguments */
582 xdr = proc->pc_decode;
583 if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base,
584 rqstp->rq_argp)) {
585 dprintk("nfsd: failed to decode arguments!\n");
586 *statp = rpc_garbage_args;
587 return 1;
588 }
589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 /* Check whether we have this call in the cache. */
J. Bruce Fields10910062011-01-24 12:11:02 -0500591 switch (nfsd_cache_lookup(rqstp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 case RC_INTR:
593 case RC_DROPIT:
594 return 0;
595 case RC_REPLY:
596 return 1;
597 case RC_DOIT:;
598 /* do it */
599 }
600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 /* 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);
J. Bruce Fields9e701c62011-01-02 21:56:36 -0500611 if (nfserr == nfserr_dropit || rqstp->rq_dropme) {
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}